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1/*
2 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved.
3 * Copyright (c) 2004 Topspin Corporation. All rights reserved.
4 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved.
5 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 */
35
36#include <linux/completion.h>
37#include <linux/dma-mapping.h>
38#include <linux/device.h>
39#include <linux/err.h>
40#include <linux/idr.h>
41#include <linux/interrupt.h>
42#include <linux/random.h>
43#include <linux/rbtree.h>
44#include <linux/spinlock.h>
45#include <linux/slab.h>
46#include <linux/sysfs.h>
47#include <linux/workqueue.h>
48#include <linux/kdev_t.h>
49
50#include <rdma/ib_cache.h>
51#include <rdma/ib_cm.h>
52#include "cm_msgs.h"
53
54MODULE_AUTHOR("Sean Hefty");
55MODULE_DESCRIPTION("InfiniBand CM");
56MODULE_LICENSE("Dual BSD/GPL");
57
58static void cm_add_one(struct ib_device *device);
59static void cm_remove_one(struct ib_device *device);
60
61static struct ib_client cm_client = {
62 .name = "cm",
63 .add = cm_add_one,
64 .remove = cm_remove_one
65};
66
67static struct ib_cm {
68 spinlock_t lock;
69 struct list_head device_list;
70 rwlock_t device_lock;
71 struct rb_root listen_service_table;
72 u64 listen_service_id;
73 /* struct rb_root peer_service_table; todo: fix peer to peer */
74 struct rb_root remote_qp_table;
75 struct rb_root remote_id_table;
76 struct rb_root remote_sidr_table;
77 struct idr local_id_table;
78 __be32 random_id_operand;
79 struct list_head timewait_list;
80 struct workqueue_struct *wq;
81} cm;
82
83/* Counter indexes ordered by attribute ID */
84enum {
85 CM_REQ_COUNTER,
86 CM_MRA_COUNTER,
87 CM_REJ_COUNTER,
88 CM_REP_COUNTER,
89 CM_RTU_COUNTER,
90 CM_DREQ_COUNTER,
91 CM_DREP_COUNTER,
92 CM_SIDR_REQ_COUNTER,
93 CM_SIDR_REP_COUNTER,
94 CM_LAP_COUNTER,
95 CM_APR_COUNTER,
96 CM_ATTR_COUNT,
97 CM_ATTR_ID_OFFSET = 0x0010,
98};
99
100enum {
101 CM_XMIT,
102 CM_XMIT_RETRIES,
103 CM_RECV,
104 CM_RECV_DUPLICATES,
105 CM_COUNTER_GROUPS
106};
107
108static char const counter_group_names[CM_COUNTER_GROUPS]
109 [sizeof("cm_rx_duplicates")] = {
110 "cm_tx_msgs", "cm_tx_retries",
111 "cm_rx_msgs", "cm_rx_duplicates"
112};
113
114struct cm_counter_group {
115 struct kobject obj;
116 atomic_long_t counter[CM_ATTR_COUNT];
117};
118
119struct cm_counter_attribute {
120 struct attribute attr;
121 int index;
122};
123
124#define CM_COUNTER_ATTR(_name, _index) \
125struct cm_counter_attribute cm_##_name##_counter_attr = { \
126 .attr = { .name = __stringify(_name), .mode = 0444 }, \
127 .index = _index \
128}
129
130static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
131static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
132static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
133static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
134static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
135static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
136static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
137static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
138static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
139static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
140static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
141
142static struct attribute *cm_counter_default_attrs[] = {
143 &cm_req_counter_attr.attr,
144 &cm_mra_counter_attr.attr,
145 &cm_rej_counter_attr.attr,
146 &cm_rep_counter_attr.attr,
147 &cm_rtu_counter_attr.attr,
148 &cm_dreq_counter_attr.attr,
149 &cm_drep_counter_attr.attr,
150 &cm_sidr_req_counter_attr.attr,
151 &cm_sidr_rep_counter_attr.attr,
152 &cm_lap_counter_attr.attr,
153 &cm_apr_counter_attr.attr,
154 NULL
155};
156
157struct cm_port {
158 struct cm_device *cm_dev;
159 struct ib_mad_agent *mad_agent;
160 struct kobject port_obj;
161 u8 port_num;
162 struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
163};
164
165struct cm_device {
166 struct list_head list;
167 struct ib_device *ib_device;
168 struct device *device;
169 u8 ack_delay;
170 struct cm_port *port[0];
171};
172
173struct cm_av {
174 struct cm_port *port;
175 union ib_gid dgid;
176 struct ib_ah_attr ah_attr;
177 u16 pkey_index;
178 u8 timeout;
179};
180
181struct cm_work {
182 struct delayed_work work;
183 struct list_head list;
184 struct cm_port *port;
185 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
186 __be32 local_id; /* Established / timewait */
187 __be32 remote_id;
188 struct ib_cm_event cm_event;
189 struct ib_sa_path_rec path[0];
190};
191
192struct cm_timewait_info {
193 struct cm_work work; /* Must be first. */
194 struct list_head list;
195 struct rb_node remote_qp_node;
196 struct rb_node remote_id_node;
197 __be64 remote_ca_guid;
198 __be32 remote_qpn;
199 u8 inserted_remote_qp;
200 u8 inserted_remote_id;
201};
202
203struct cm_id_private {
204 struct ib_cm_id id;
205
206 struct rb_node service_node;
207 struct rb_node sidr_id_node;
208 spinlock_t lock; /* Do not acquire inside cm.lock */
209 struct completion comp;
210 atomic_t refcount;
211
212 struct ib_mad_send_buf *msg;
213 struct cm_timewait_info *timewait_info;
214 /* todo: use alternate port on send failure */
215 struct cm_av av;
216 struct cm_av alt_av;
217 struct ib_cm_compare_data *compare_data;
218
219 void *private_data;
220 __be64 tid;
221 __be32 local_qpn;
222 __be32 remote_qpn;
223 enum ib_qp_type qp_type;
224 __be32 sq_psn;
225 __be32 rq_psn;
226 int timeout_ms;
227 enum ib_mtu path_mtu;
228 __be16 pkey;
229 u8 private_data_len;
230 u8 max_cm_retries;
231 u8 peer_to_peer;
232 u8 responder_resources;
233 u8 initiator_depth;
234 u8 retry_count;
235 u8 rnr_retry_count;
236 u8 service_timeout;
237 u8 target_ack_delay;
238
239 struct list_head work_list;
240 atomic_t work_count;
241};
242
243static void cm_work_handler(struct work_struct *work);
244
245static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
246{
247 if (atomic_dec_and_test(&cm_id_priv->refcount))
248 complete(&cm_id_priv->comp);
249}
250
251static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
252 struct ib_mad_send_buf **msg)
253{
254 struct ib_mad_agent *mad_agent;
255 struct ib_mad_send_buf *m;
256 struct ib_ah *ah;
257
258 mad_agent = cm_id_priv->av.port->mad_agent;
259 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
260 if (IS_ERR(ah))
261 return PTR_ERR(ah);
262
263 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
264 cm_id_priv->av.pkey_index,
265 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
266 GFP_ATOMIC);
267 if (IS_ERR(m)) {
268 ib_destroy_ah(ah);
269 return PTR_ERR(m);
270 }
271
272 /* Timeout set by caller if response is expected. */
273 m->ah = ah;
274 m->retries = cm_id_priv->max_cm_retries;
275
276 atomic_inc(&cm_id_priv->refcount);
277 m->context[0] = cm_id_priv;
278 *msg = m;
279 return 0;
280}
281
282static int cm_alloc_response_msg(struct cm_port *port,
283 struct ib_mad_recv_wc *mad_recv_wc,
284 struct ib_mad_send_buf **msg)
285{
286 struct ib_mad_send_buf *m;
287 struct ib_ah *ah;
288
289 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
290 mad_recv_wc->recv_buf.grh, port->port_num);
291 if (IS_ERR(ah))
292 return PTR_ERR(ah);
293
294 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
295 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
296 GFP_ATOMIC);
297 if (IS_ERR(m)) {
298 ib_destroy_ah(ah);
299 return PTR_ERR(m);
300 }
301 m->ah = ah;
302 *msg = m;
303 return 0;
304}
305
306static void cm_free_msg(struct ib_mad_send_buf *msg)
307{
308 ib_destroy_ah(msg->ah);
309 if (msg->context[0])
310 cm_deref_id(msg->context[0]);
311 ib_free_send_mad(msg);
312}
313
314static void * cm_copy_private_data(const void *private_data,
315 u8 private_data_len)
316{
317 void *data;
318
319 if (!private_data || !private_data_len)
320 return NULL;
321
322 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
323 if (!data)
324 return ERR_PTR(-ENOMEM);
325
326 return data;
327}
328
329static void cm_set_private_data(struct cm_id_private *cm_id_priv,
330 void *private_data, u8 private_data_len)
331{
332 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
333 kfree(cm_id_priv->private_data);
334
335 cm_id_priv->private_data = private_data;
336 cm_id_priv->private_data_len = private_data_len;
337}
338
339static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
340 struct ib_grh *grh, struct cm_av *av)
341{
342 av->port = port;
343 av->pkey_index = wc->pkey_index;
344 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc,
345 grh, &av->ah_attr);
346}
347
348static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
349{
350 struct cm_device *cm_dev;
351 struct cm_port *port = NULL;
352 unsigned long flags;
353 int ret;
354 u8 p;
355
356 read_lock_irqsave(&cm.device_lock, flags);
357 list_for_each_entry(cm_dev, &cm.device_list, list) {
358 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid,
359 &p, NULL)) {
360 port = cm_dev->port[p-1];
361 break;
362 }
363 }
364 read_unlock_irqrestore(&cm.device_lock, flags);
365
366 if (!port)
367 return -EINVAL;
368
369 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
370 be16_to_cpu(path->pkey), &av->pkey_index);
371 if (ret)
372 return ret;
373
374 av->port = port;
375 ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path,
376 &av->ah_attr);
377 av->timeout = path->packet_life_time + 1;
378 return 0;
379}
380
381static int cm_alloc_id(struct cm_id_private *cm_id_priv)
382{
383 unsigned long flags;
384 int ret, id;
385 static int next_id;
386
387 do {
388 spin_lock_irqsave(&cm.lock, flags);
389 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv,
390 next_id, &id);
391 if (!ret)
392 next_id = ((unsigned) id + 1) & MAX_ID_MASK;
393 spin_unlock_irqrestore(&cm.lock, flags);
394 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
395
396 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
397 return ret;
398}
399
400static void cm_free_id(__be32 local_id)
401{
402 spin_lock_irq(&cm.lock);
403 idr_remove(&cm.local_id_table,
404 (__force int) (local_id ^ cm.random_id_operand));
405 spin_unlock_irq(&cm.lock);
406}
407
408static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
409{
410 struct cm_id_private *cm_id_priv;
411
412 cm_id_priv = idr_find(&cm.local_id_table,
413 (__force int) (local_id ^ cm.random_id_operand));
414 if (cm_id_priv) {
415 if (cm_id_priv->id.remote_id == remote_id)
416 atomic_inc(&cm_id_priv->refcount);
417 else
418 cm_id_priv = NULL;
419 }
420
421 return cm_id_priv;
422}
423
424static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
425{
426 struct cm_id_private *cm_id_priv;
427
428 spin_lock_irq(&cm.lock);
429 cm_id_priv = cm_get_id(local_id, remote_id);
430 spin_unlock_irq(&cm.lock);
431
432 return cm_id_priv;
433}
434
435static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
436{
437 int i;
438
439 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
440 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
441 ((unsigned long *) mask)[i];
442}
443
444static int cm_compare_data(struct ib_cm_compare_data *src_data,
445 struct ib_cm_compare_data *dst_data)
446{
447 u8 src[IB_CM_COMPARE_SIZE];
448 u8 dst[IB_CM_COMPARE_SIZE];
449
450 if (!src_data || !dst_data)
451 return 0;
452
453 cm_mask_copy(src, src_data->data, dst_data->mask);
454 cm_mask_copy(dst, dst_data->data, src_data->mask);
455 return memcmp(src, dst, IB_CM_COMPARE_SIZE);
456}
457
458static int cm_compare_private_data(u8 *private_data,
459 struct ib_cm_compare_data *dst_data)
460{
461 u8 src[IB_CM_COMPARE_SIZE];
462
463 if (!dst_data)
464 return 0;
465
466 cm_mask_copy(src, private_data, dst_data->mask);
467 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
468}
469
470/*
471 * Trivial helpers to strip endian annotation and compare; the
472 * endianness doesn't actually matter since we just need a stable
473 * order for the RB tree.
474 */
475static int be32_lt(__be32 a, __be32 b)
476{
477 return (__force u32) a < (__force u32) b;
478}
479
480static int be32_gt(__be32 a, __be32 b)
481{
482 return (__force u32) a > (__force u32) b;
483}
484
485static int be64_lt(__be64 a, __be64 b)
486{
487 return (__force u64) a < (__force u64) b;
488}
489
490static int be64_gt(__be64 a, __be64 b)
491{
492 return (__force u64) a > (__force u64) b;
493}
494
495static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
496{
497 struct rb_node **link = &cm.listen_service_table.rb_node;
498 struct rb_node *parent = NULL;
499 struct cm_id_private *cur_cm_id_priv;
500 __be64 service_id = cm_id_priv->id.service_id;
501 __be64 service_mask = cm_id_priv->id.service_mask;
502 int data_cmp;
503
504 while (*link) {
505 parent = *link;
506 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
507 service_node);
508 data_cmp = cm_compare_data(cm_id_priv->compare_data,
509 cur_cm_id_priv->compare_data);
510 if ((cur_cm_id_priv->id.service_mask & service_id) ==
511 (service_mask & cur_cm_id_priv->id.service_id) &&
512 (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
513 !data_cmp)
514 return cur_cm_id_priv;
515
516 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
517 link = &(*link)->rb_left;
518 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
519 link = &(*link)->rb_right;
520 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
521 link = &(*link)->rb_left;
522 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
523 link = &(*link)->rb_right;
524 else if (data_cmp < 0)
525 link = &(*link)->rb_left;
526 else
527 link = &(*link)->rb_right;
528 }
529 rb_link_node(&cm_id_priv->service_node, parent, link);
530 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
531 return NULL;
532}
533
534static struct cm_id_private * cm_find_listen(struct ib_device *device,
535 __be64 service_id,
536 u8 *private_data)
537{
538 struct rb_node *node = cm.listen_service_table.rb_node;
539 struct cm_id_private *cm_id_priv;
540 int data_cmp;
541
542 while (node) {
543 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
544 data_cmp = cm_compare_private_data(private_data,
545 cm_id_priv->compare_data);
546 if ((cm_id_priv->id.service_mask & service_id) ==
547 cm_id_priv->id.service_id &&
548 (cm_id_priv->id.device == device) && !data_cmp)
549 return cm_id_priv;
550
551 if (device < cm_id_priv->id.device)
552 node = node->rb_left;
553 else if (device > cm_id_priv->id.device)
554 node = node->rb_right;
555 else if (be64_lt(service_id, cm_id_priv->id.service_id))
556 node = node->rb_left;
557 else if (be64_gt(service_id, cm_id_priv->id.service_id))
558 node = node->rb_right;
559 else if (data_cmp < 0)
560 node = node->rb_left;
561 else
562 node = node->rb_right;
563 }
564 return NULL;
565}
566
567static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
568 *timewait_info)
569{
570 struct rb_node **link = &cm.remote_id_table.rb_node;
571 struct rb_node *parent = NULL;
572 struct cm_timewait_info *cur_timewait_info;
573 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
574 __be32 remote_id = timewait_info->work.remote_id;
575
576 while (*link) {
577 parent = *link;
578 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
579 remote_id_node);
580 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
581 link = &(*link)->rb_left;
582 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
583 link = &(*link)->rb_right;
584 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
585 link = &(*link)->rb_left;
586 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
587 link = &(*link)->rb_right;
588 else
589 return cur_timewait_info;
590 }
591 timewait_info->inserted_remote_id = 1;
592 rb_link_node(&timewait_info->remote_id_node, parent, link);
593 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
594 return NULL;
595}
596
597static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
598 __be32 remote_id)
599{
600 struct rb_node *node = cm.remote_id_table.rb_node;
601 struct cm_timewait_info *timewait_info;
602
603 while (node) {
604 timewait_info = rb_entry(node, struct cm_timewait_info,
605 remote_id_node);
606 if (be32_lt(remote_id, timewait_info->work.remote_id))
607 node = node->rb_left;
608 else if (be32_gt(remote_id, timewait_info->work.remote_id))
609 node = node->rb_right;
610 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
611 node = node->rb_left;
612 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
613 node = node->rb_right;
614 else
615 return timewait_info;
616 }
617 return NULL;
618}
619
620static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
621 *timewait_info)
622{
623 struct rb_node **link = &cm.remote_qp_table.rb_node;
624 struct rb_node *parent = NULL;
625 struct cm_timewait_info *cur_timewait_info;
626 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
627 __be32 remote_qpn = timewait_info->remote_qpn;
628
629 while (*link) {
630 parent = *link;
631 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
632 remote_qp_node);
633 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
634 link = &(*link)->rb_left;
635 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
636 link = &(*link)->rb_right;
637 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
638 link = &(*link)->rb_left;
639 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
640 link = &(*link)->rb_right;
641 else
642 return cur_timewait_info;
643 }
644 timewait_info->inserted_remote_qp = 1;
645 rb_link_node(&timewait_info->remote_qp_node, parent, link);
646 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
647 return NULL;
648}
649
650static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
651 *cm_id_priv)
652{
653 struct rb_node **link = &cm.remote_sidr_table.rb_node;
654 struct rb_node *parent = NULL;
655 struct cm_id_private *cur_cm_id_priv;
656 union ib_gid *port_gid = &cm_id_priv->av.dgid;
657 __be32 remote_id = cm_id_priv->id.remote_id;
658
659 while (*link) {
660 parent = *link;
661 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
662 sidr_id_node);
663 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
664 link = &(*link)->rb_left;
665 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
666 link = &(*link)->rb_right;
667 else {
668 int cmp;
669 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
670 sizeof *port_gid);
671 if (cmp < 0)
672 link = &(*link)->rb_left;
673 else if (cmp > 0)
674 link = &(*link)->rb_right;
675 else
676 return cur_cm_id_priv;
677 }
678 }
679 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
680 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
681 return NULL;
682}
683
684static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
685 enum ib_cm_sidr_status status)
686{
687 struct ib_cm_sidr_rep_param param;
688
689 memset(¶m, 0, sizeof param);
690 param.status = status;
691 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m);
692}
693
694struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
695 ib_cm_handler cm_handler,
696 void *context)
697{
698 struct cm_id_private *cm_id_priv;
699 int ret;
700
701 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
702 if (!cm_id_priv)
703 return ERR_PTR(-ENOMEM);
704
705 cm_id_priv->id.state = IB_CM_IDLE;
706 cm_id_priv->id.device = device;
707 cm_id_priv->id.cm_handler = cm_handler;
708 cm_id_priv->id.context = context;
709 cm_id_priv->id.remote_cm_qpn = 1;
710 ret = cm_alloc_id(cm_id_priv);
711 if (ret)
712 goto error;
713
714 spin_lock_init(&cm_id_priv->lock);
715 init_completion(&cm_id_priv->comp);
716 INIT_LIST_HEAD(&cm_id_priv->work_list);
717 atomic_set(&cm_id_priv->work_count, -1);
718 atomic_set(&cm_id_priv->refcount, 1);
719 return &cm_id_priv->id;
720
721error:
722 kfree(cm_id_priv);
723 return ERR_PTR(-ENOMEM);
724}
725EXPORT_SYMBOL(ib_create_cm_id);
726
727static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
728{
729 struct cm_work *work;
730
731 if (list_empty(&cm_id_priv->work_list))
732 return NULL;
733
734 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
735 list_del(&work->list);
736 return work;
737}
738
739static void cm_free_work(struct cm_work *work)
740{
741 if (work->mad_recv_wc)
742 ib_free_recv_mad(work->mad_recv_wc);
743 kfree(work);
744}
745
746static inline int cm_convert_to_ms(int iba_time)
747{
748 /* approximate conversion to ms from 4.096us x 2^iba_time */
749 return 1 << max(iba_time - 8, 0);
750}
751
752/*
753 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
754 * Because of how ack_timeout is stored, adding one doubles the timeout.
755 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
756 * increment it (round up) only if the other is within 50%.
757 */
758static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
759{
760 int ack_timeout = packet_life_time + 1;
761
762 if (ack_timeout >= ca_ack_delay)
763 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
764 else
765 ack_timeout = ca_ack_delay +
766 (ack_timeout >= (ca_ack_delay - 1));
767
768 return min(31, ack_timeout);
769}
770
771static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
772{
773 if (timewait_info->inserted_remote_id) {
774 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
775 timewait_info->inserted_remote_id = 0;
776 }
777
778 if (timewait_info->inserted_remote_qp) {
779 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
780 timewait_info->inserted_remote_qp = 0;
781 }
782}
783
784static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
785{
786 struct cm_timewait_info *timewait_info;
787
788 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
789 if (!timewait_info)
790 return ERR_PTR(-ENOMEM);
791
792 timewait_info->work.local_id = local_id;
793 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
794 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
795 return timewait_info;
796}
797
798static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
799{
800 int wait_time;
801 unsigned long flags;
802
803 spin_lock_irqsave(&cm.lock, flags);
804 cm_cleanup_timewait(cm_id_priv->timewait_info);
805 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
806 spin_unlock_irqrestore(&cm.lock, flags);
807
808 /*
809 * The cm_id could be destroyed by the user before we exit timewait.
810 * To protect against this, we search for the cm_id after exiting
811 * timewait before notifying the user that we've exited timewait.
812 */
813 cm_id_priv->id.state = IB_CM_TIMEWAIT;
814 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
815 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
816 msecs_to_jiffies(wait_time));
817 cm_id_priv->timewait_info = NULL;
818}
819
820static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
821{
822 unsigned long flags;
823
824 cm_id_priv->id.state = IB_CM_IDLE;
825 if (cm_id_priv->timewait_info) {
826 spin_lock_irqsave(&cm.lock, flags);
827 cm_cleanup_timewait(cm_id_priv->timewait_info);
828 spin_unlock_irqrestore(&cm.lock, flags);
829 kfree(cm_id_priv->timewait_info);
830 cm_id_priv->timewait_info = NULL;
831 }
832}
833
834static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
835{
836 struct cm_id_private *cm_id_priv;
837 struct cm_work *work;
838
839 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
840retest:
841 spin_lock_irq(&cm_id_priv->lock);
842 switch (cm_id->state) {
843 case IB_CM_LISTEN:
844 cm_id->state = IB_CM_IDLE;
845 spin_unlock_irq(&cm_id_priv->lock);
846 spin_lock_irq(&cm.lock);
847 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
848 spin_unlock_irq(&cm.lock);
849 break;
850 case IB_CM_SIDR_REQ_SENT:
851 cm_id->state = IB_CM_IDLE;
852 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
853 spin_unlock_irq(&cm_id_priv->lock);
854 break;
855 case IB_CM_SIDR_REQ_RCVD:
856 spin_unlock_irq(&cm_id_priv->lock);
857 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
858 break;
859 case IB_CM_REQ_SENT:
860 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
861 spin_unlock_irq(&cm_id_priv->lock);
862 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
863 &cm_id_priv->id.device->node_guid,
864 sizeof cm_id_priv->id.device->node_guid,
865 NULL, 0);
866 break;
867 case IB_CM_REQ_RCVD:
868 if (err == -ENOMEM) {
869 /* Do not reject to allow future retries. */
870 cm_reset_to_idle(cm_id_priv);
871 spin_unlock_irq(&cm_id_priv->lock);
872 } else {
873 spin_unlock_irq(&cm_id_priv->lock);
874 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
875 NULL, 0, NULL, 0);
876 }
877 break;
878 case IB_CM_MRA_REQ_RCVD:
879 case IB_CM_REP_SENT:
880 case IB_CM_MRA_REP_RCVD:
881 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
882 /* Fall through */
883 case IB_CM_MRA_REQ_SENT:
884 case IB_CM_REP_RCVD:
885 case IB_CM_MRA_REP_SENT:
886 spin_unlock_irq(&cm_id_priv->lock);
887 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
888 NULL, 0, NULL, 0);
889 break;
890 case IB_CM_ESTABLISHED:
891 spin_unlock_irq(&cm_id_priv->lock);
892 ib_send_cm_dreq(cm_id, NULL, 0);
893 goto retest;
894 case IB_CM_DREQ_SENT:
895 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
896 cm_enter_timewait(cm_id_priv);
897 spin_unlock_irq(&cm_id_priv->lock);
898 break;
899 case IB_CM_DREQ_RCVD:
900 spin_unlock_irq(&cm_id_priv->lock);
901 ib_send_cm_drep(cm_id, NULL, 0);
902 break;
903 default:
904 spin_unlock_irq(&cm_id_priv->lock);
905 break;
906 }
907
908 cm_free_id(cm_id->local_id);
909 cm_deref_id(cm_id_priv);
910 wait_for_completion(&cm_id_priv->comp);
911 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
912 cm_free_work(work);
913 kfree(cm_id_priv->compare_data);
914 kfree(cm_id_priv->private_data);
915 kfree(cm_id_priv);
916}
917
918void ib_destroy_cm_id(struct ib_cm_id *cm_id)
919{
920 cm_destroy_id(cm_id, 0);
921}
922EXPORT_SYMBOL(ib_destroy_cm_id);
923
924int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
925 struct ib_cm_compare_data *compare_data)
926{
927 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
928 unsigned long flags;
929 int ret = 0;
930
931 service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
932 service_id &= service_mask;
933 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
934 (service_id != IB_CM_ASSIGN_SERVICE_ID))
935 return -EINVAL;
936
937 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
938 if (cm_id->state != IB_CM_IDLE)
939 return -EINVAL;
940
941 if (compare_data) {
942 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
943 GFP_KERNEL);
944 if (!cm_id_priv->compare_data)
945 return -ENOMEM;
946 cm_mask_copy(cm_id_priv->compare_data->data,
947 compare_data->data, compare_data->mask);
948 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
949 IB_CM_COMPARE_SIZE);
950 }
951
952 cm_id->state = IB_CM_LISTEN;
953
954 spin_lock_irqsave(&cm.lock, flags);
955 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
956 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
957 cm_id->service_mask = ~cpu_to_be64(0);
958 } else {
959 cm_id->service_id = service_id;
960 cm_id->service_mask = service_mask;
961 }
962 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
963 spin_unlock_irqrestore(&cm.lock, flags);
964
965 if (cur_cm_id_priv) {
966 cm_id->state = IB_CM_IDLE;
967 kfree(cm_id_priv->compare_data);
968 cm_id_priv->compare_data = NULL;
969 ret = -EBUSY;
970 }
971 return ret;
972}
973EXPORT_SYMBOL(ib_cm_listen);
974
975static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
976 enum cm_msg_sequence msg_seq)
977{
978 u64 hi_tid, low_tid;
979
980 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
981 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
982 (msg_seq << 30));
983 return cpu_to_be64(hi_tid | low_tid);
984}
985
986static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
987 __be16 attr_id, __be64 tid)
988{
989 hdr->base_version = IB_MGMT_BASE_VERSION;
990 hdr->mgmt_class = IB_MGMT_CLASS_CM;
991 hdr->class_version = IB_CM_CLASS_VERSION;
992 hdr->method = IB_MGMT_METHOD_SEND;
993 hdr->attr_id = attr_id;
994 hdr->tid = tid;
995}
996
997static void cm_format_req(struct cm_req_msg *req_msg,
998 struct cm_id_private *cm_id_priv,
999 struct ib_cm_req_param *param)
1000{
1001 struct ib_sa_path_rec *pri_path = param->primary_path;
1002 struct ib_sa_path_rec *alt_path = param->alternate_path;
1003
1004 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1005 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
1006
1007 req_msg->local_comm_id = cm_id_priv->id.local_id;
1008 req_msg->service_id = param->service_id;
1009 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1010 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
1011 cm_req_set_resp_res(req_msg, param->responder_resources);
1012 cm_req_set_init_depth(req_msg, param->initiator_depth);
1013 cm_req_set_remote_resp_timeout(req_msg,
1014 param->remote_cm_response_timeout);
1015 cm_req_set_qp_type(req_msg, param->qp_type);
1016 cm_req_set_flow_ctrl(req_msg, param->flow_control);
1017 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
1018 cm_req_set_local_resp_timeout(req_msg,
1019 param->local_cm_response_timeout);
1020 cm_req_set_retry_count(req_msg, param->retry_count);
1021 req_msg->pkey = param->primary_path->pkey;
1022 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
1023 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
1024 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
1025 cm_req_set_srq(req_msg, param->srq);
1026
1027 if (pri_path->hop_limit <= 1) {
1028 req_msg->primary_local_lid = pri_path->slid;
1029 req_msg->primary_remote_lid = pri_path->dlid;
1030 } else {
1031 /* Work-around until there's a way to obtain remote LID info */
1032 req_msg->primary_local_lid = IB_LID_PERMISSIVE;
1033 req_msg->primary_remote_lid = IB_LID_PERMISSIVE;
1034 }
1035 req_msg->primary_local_gid = pri_path->sgid;
1036 req_msg->primary_remote_gid = pri_path->dgid;
1037 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label);
1038 cm_req_set_primary_packet_rate(req_msg, pri_path->rate);
1039 req_msg->primary_traffic_class = pri_path->traffic_class;
1040 req_msg->primary_hop_limit = pri_path->hop_limit;
1041 cm_req_set_primary_sl(req_msg, pri_path->sl);
1042 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1));
1043 cm_req_set_primary_local_ack_timeout(req_msg,
1044 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1045 pri_path->packet_life_time));
1046
1047 if (alt_path) {
1048 if (alt_path->hop_limit <= 1) {
1049 req_msg->alt_local_lid = alt_path->slid;
1050 req_msg->alt_remote_lid = alt_path->dlid;
1051 } else {
1052 req_msg->alt_local_lid = IB_LID_PERMISSIVE;
1053 req_msg->alt_remote_lid = IB_LID_PERMISSIVE;
1054 }
1055 req_msg->alt_local_gid = alt_path->sgid;
1056 req_msg->alt_remote_gid = alt_path->dgid;
1057 cm_req_set_alt_flow_label(req_msg,
1058 alt_path->flow_label);
1059 cm_req_set_alt_packet_rate(req_msg, alt_path->rate);
1060 req_msg->alt_traffic_class = alt_path->traffic_class;
1061 req_msg->alt_hop_limit = alt_path->hop_limit;
1062 cm_req_set_alt_sl(req_msg, alt_path->sl);
1063 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1));
1064 cm_req_set_alt_local_ack_timeout(req_msg,
1065 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1066 alt_path->packet_life_time));
1067 }
1068
1069 if (param->private_data && param->private_data_len)
1070 memcpy(req_msg->private_data, param->private_data,
1071 param->private_data_len);
1072}
1073
1074static int cm_validate_req_param(struct ib_cm_req_param *param)
1075{
1076 /* peer-to-peer not supported */
1077 if (param->peer_to_peer)
1078 return -EINVAL;
1079
1080 if (!param->primary_path)
1081 return -EINVAL;
1082
1083 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
1084 return -EINVAL;
1085
1086 if (param->private_data &&
1087 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1088 return -EINVAL;
1089
1090 if (param->alternate_path &&
1091 (param->alternate_path->pkey != param->primary_path->pkey ||
1092 param->alternate_path->mtu != param->primary_path->mtu))
1093 return -EINVAL;
1094
1095 return 0;
1096}
1097
1098int ib_send_cm_req(struct ib_cm_id *cm_id,
1099 struct ib_cm_req_param *param)
1100{
1101 struct cm_id_private *cm_id_priv;
1102 struct cm_req_msg *req_msg;
1103 unsigned long flags;
1104 int ret;
1105
1106 ret = cm_validate_req_param(param);
1107 if (ret)
1108 return ret;
1109
1110 /* Verify that we're not in timewait. */
1111 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1112 spin_lock_irqsave(&cm_id_priv->lock, flags);
1113 if (cm_id->state != IB_CM_IDLE) {
1114 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1115 ret = -EINVAL;
1116 goto out;
1117 }
1118 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1119
1120 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1121 id.local_id);
1122 if (IS_ERR(cm_id_priv->timewait_info)) {
1123 ret = PTR_ERR(cm_id_priv->timewait_info);
1124 goto out;
1125 }
1126
1127 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
1128 if (ret)
1129 goto error1;
1130 if (param->alternate_path) {
1131 ret = cm_init_av_by_path(param->alternate_path,
1132 &cm_id_priv->alt_av);
1133 if (ret)
1134 goto error1;
1135 }
1136 cm_id->service_id = param->service_id;
1137 cm_id->service_mask = ~cpu_to_be64(0);
1138 cm_id_priv->timeout_ms = cm_convert_to_ms(
1139 param->primary_path->packet_life_time) * 2 +
1140 cm_convert_to_ms(
1141 param->remote_cm_response_timeout);
1142 cm_id_priv->max_cm_retries = param->max_cm_retries;
1143 cm_id_priv->initiator_depth = param->initiator_depth;
1144 cm_id_priv->responder_resources = param->responder_resources;
1145 cm_id_priv->retry_count = param->retry_count;
1146 cm_id_priv->path_mtu = param->primary_path->mtu;
1147 cm_id_priv->pkey = param->primary_path->pkey;
1148 cm_id_priv->qp_type = param->qp_type;
1149
1150 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1151 if (ret)
1152 goto error1;
1153
1154 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1155 cm_format_req(req_msg, cm_id_priv, param);
1156 cm_id_priv->tid = req_msg->hdr.tid;
1157 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1158 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1159
1160 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1161 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1162
1163 spin_lock_irqsave(&cm_id_priv->lock, flags);
1164 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1165 if (ret) {
1166 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1167 goto error2;
1168 }
1169 BUG_ON(cm_id->state != IB_CM_IDLE);
1170 cm_id->state = IB_CM_REQ_SENT;
1171 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1172 return 0;
1173
1174error2: cm_free_msg(cm_id_priv->msg);
1175error1: kfree(cm_id_priv->timewait_info);
1176out: return ret;
1177}
1178EXPORT_SYMBOL(ib_send_cm_req);
1179
1180static int cm_issue_rej(struct cm_port *port,
1181 struct ib_mad_recv_wc *mad_recv_wc,
1182 enum ib_cm_rej_reason reason,
1183 enum cm_msg_response msg_rejected,
1184 void *ari, u8 ari_length)
1185{
1186 struct ib_mad_send_buf *msg = NULL;
1187 struct cm_rej_msg *rej_msg, *rcv_msg;
1188 int ret;
1189
1190 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1191 if (ret)
1192 return ret;
1193
1194 /* We just need common CM header information. Cast to any message. */
1195 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1196 rej_msg = (struct cm_rej_msg *) msg->mad;
1197
1198 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1199 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1200 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1201 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1202 rej_msg->reason = cpu_to_be16(reason);
1203
1204 if (ari && ari_length) {
1205 cm_rej_set_reject_info_len(rej_msg, ari_length);
1206 memcpy(rej_msg->ari, ari, ari_length);
1207 }
1208
1209 ret = ib_post_send_mad(msg, NULL);
1210 if (ret)
1211 cm_free_msg(msg);
1212
1213 return ret;
1214}
1215
1216static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1217 __be32 local_qpn, __be32 remote_qpn)
1218{
1219 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1220 ((local_ca_guid == remote_ca_guid) &&
1221 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1222}
1223
1224static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1225 struct ib_sa_path_rec *primary_path,
1226 struct ib_sa_path_rec *alt_path)
1227{
1228 memset(primary_path, 0, sizeof *primary_path);
1229 primary_path->dgid = req_msg->primary_local_gid;
1230 primary_path->sgid = req_msg->primary_remote_gid;
1231 primary_path->dlid = req_msg->primary_local_lid;
1232 primary_path->slid = req_msg->primary_remote_lid;
1233 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1234 primary_path->hop_limit = req_msg->primary_hop_limit;
1235 primary_path->traffic_class = req_msg->primary_traffic_class;
1236 primary_path->reversible = 1;
1237 primary_path->pkey = req_msg->pkey;
1238 primary_path->sl = cm_req_get_primary_sl(req_msg);
1239 primary_path->mtu_selector = IB_SA_EQ;
1240 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1241 primary_path->rate_selector = IB_SA_EQ;
1242 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1243 primary_path->packet_life_time_selector = IB_SA_EQ;
1244 primary_path->packet_life_time =
1245 cm_req_get_primary_local_ack_timeout(req_msg);
1246 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1247
1248 if (req_msg->alt_local_lid) {
1249 memset(alt_path, 0, sizeof *alt_path);
1250 alt_path->dgid = req_msg->alt_local_gid;
1251 alt_path->sgid = req_msg->alt_remote_gid;
1252 alt_path->dlid = req_msg->alt_local_lid;
1253 alt_path->slid = req_msg->alt_remote_lid;
1254 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1255 alt_path->hop_limit = req_msg->alt_hop_limit;
1256 alt_path->traffic_class = req_msg->alt_traffic_class;
1257 alt_path->reversible = 1;
1258 alt_path->pkey = req_msg->pkey;
1259 alt_path->sl = cm_req_get_alt_sl(req_msg);
1260 alt_path->mtu_selector = IB_SA_EQ;
1261 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1262 alt_path->rate_selector = IB_SA_EQ;
1263 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1264 alt_path->packet_life_time_selector = IB_SA_EQ;
1265 alt_path->packet_life_time =
1266 cm_req_get_alt_local_ack_timeout(req_msg);
1267 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1268 }
1269}
1270
1271static void cm_format_req_event(struct cm_work *work,
1272 struct cm_id_private *cm_id_priv,
1273 struct ib_cm_id *listen_id)
1274{
1275 struct cm_req_msg *req_msg;
1276 struct ib_cm_req_event_param *param;
1277
1278 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1279 param = &work->cm_event.param.req_rcvd;
1280 param->listen_id = listen_id;
1281 param->port = cm_id_priv->av.port->port_num;
1282 param->primary_path = &work->path[0];
1283 if (req_msg->alt_local_lid)
1284 param->alternate_path = &work->path[1];
1285 else
1286 param->alternate_path = NULL;
1287 param->remote_ca_guid = req_msg->local_ca_guid;
1288 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1289 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1290 param->qp_type = cm_req_get_qp_type(req_msg);
1291 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1292 param->responder_resources = cm_req_get_init_depth(req_msg);
1293 param->initiator_depth = cm_req_get_resp_res(req_msg);
1294 param->local_cm_response_timeout =
1295 cm_req_get_remote_resp_timeout(req_msg);
1296 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1297 param->remote_cm_response_timeout =
1298 cm_req_get_local_resp_timeout(req_msg);
1299 param->retry_count = cm_req_get_retry_count(req_msg);
1300 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1301 param->srq = cm_req_get_srq(req_msg);
1302 work->cm_event.private_data = &req_msg->private_data;
1303}
1304
1305static void cm_process_work(struct cm_id_private *cm_id_priv,
1306 struct cm_work *work)
1307{
1308 int ret;
1309
1310 /* We will typically only have the current event to report. */
1311 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1312 cm_free_work(work);
1313
1314 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1315 spin_lock_irq(&cm_id_priv->lock);
1316 work = cm_dequeue_work(cm_id_priv);
1317 spin_unlock_irq(&cm_id_priv->lock);
1318 BUG_ON(!work);
1319 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1320 &work->cm_event);
1321 cm_free_work(work);
1322 }
1323 cm_deref_id(cm_id_priv);
1324 if (ret)
1325 cm_destroy_id(&cm_id_priv->id, ret);
1326}
1327
1328static void cm_format_mra(struct cm_mra_msg *mra_msg,
1329 struct cm_id_private *cm_id_priv,
1330 enum cm_msg_response msg_mraed, u8 service_timeout,
1331 const void *private_data, u8 private_data_len)
1332{
1333 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1334 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1335 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1336 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1337 cm_mra_set_service_timeout(mra_msg, service_timeout);
1338
1339 if (private_data && private_data_len)
1340 memcpy(mra_msg->private_data, private_data, private_data_len);
1341}
1342
1343static void cm_format_rej(struct cm_rej_msg *rej_msg,
1344 struct cm_id_private *cm_id_priv,
1345 enum ib_cm_rej_reason reason,
1346 void *ari,
1347 u8 ari_length,
1348 const void *private_data,
1349 u8 private_data_len)
1350{
1351 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1352 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1353
1354 switch(cm_id_priv->id.state) {
1355 case IB_CM_REQ_RCVD:
1356 rej_msg->local_comm_id = 0;
1357 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1358 break;
1359 case IB_CM_MRA_REQ_SENT:
1360 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1361 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1362 break;
1363 case IB_CM_REP_RCVD:
1364 case IB_CM_MRA_REP_SENT:
1365 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1366 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1367 break;
1368 default:
1369 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1370 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1371 break;
1372 }
1373
1374 rej_msg->reason = cpu_to_be16(reason);
1375 if (ari && ari_length) {
1376 cm_rej_set_reject_info_len(rej_msg, ari_length);
1377 memcpy(rej_msg->ari, ari, ari_length);
1378 }
1379
1380 if (private_data && private_data_len)
1381 memcpy(rej_msg->private_data, private_data, private_data_len);
1382}
1383
1384static void cm_dup_req_handler(struct cm_work *work,
1385 struct cm_id_private *cm_id_priv)
1386{
1387 struct ib_mad_send_buf *msg = NULL;
1388 int ret;
1389
1390 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1391 counter[CM_REQ_COUNTER]);
1392
1393 /* Quick state check to discard duplicate REQs. */
1394 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1395 return;
1396
1397 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1398 if (ret)
1399 return;
1400
1401 spin_lock_irq(&cm_id_priv->lock);
1402 switch (cm_id_priv->id.state) {
1403 case IB_CM_MRA_REQ_SENT:
1404 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1405 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1406 cm_id_priv->private_data,
1407 cm_id_priv->private_data_len);
1408 break;
1409 case IB_CM_TIMEWAIT:
1410 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1411 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1412 break;
1413 default:
1414 goto unlock;
1415 }
1416 spin_unlock_irq(&cm_id_priv->lock);
1417
1418 ret = ib_post_send_mad(msg, NULL);
1419 if (ret)
1420 goto free;
1421 return;
1422
1423unlock: spin_unlock_irq(&cm_id_priv->lock);
1424free: cm_free_msg(msg);
1425}
1426
1427static struct cm_id_private * cm_match_req(struct cm_work *work,
1428 struct cm_id_private *cm_id_priv)
1429{
1430 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1431 struct cm_timewait_info *timewait_info;
1432 struct cm_req_msg *req_msg;
1433
1434 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1435
1436 /* Check for possible duplicate REQ. */
1437 spin_lock_irq(&cm.lock);
1438 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1439 if (timewait_info) {
1440 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1441 timewait_info->work.remote_id);
1442 spin_unlock_irq(&cm.lock);
1443 if (cur_cm_id_priv) {
1444 cm_dup_req_handler(work, cur_cm_id_priv);
1445 cm_deref_id(cur_cm_id_priv);
1446 }
1447 return NULL;
1448 }
1449
1450 /* Check for stale connections. */
1451 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1452 if (timewait_info) {
1453 cm_cleanup_timewait(cm_id_priv->timewait_info);
1454 spin_unlock_irq(&cm.lock);
1455 cm_issue_rej(work->port, work->mad_recv_wc,
1456 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1457 NULL, 0);
1458 return NULL;
1459 }
1460
1461 /* Find matching listen request. */
1462 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1463 req_msg->service_id,
1464 req_msg->private_data);
1465 if (!listen_cm_id_priv) {
1466 cm_cleanup_timewait(cm_id_priv->timewait_info);
1467 spin_unlock_irq(&cm.lock);
1468 cm_issue_rej(work->port, work->mad_recv_wc,
1469 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1470 NULL, 0);
1471 goto out;
1472 }
1473 atomic_inc(&listen_cm_id_priv->refcount);
1474 atomic_inc(&cm_id_priv->refcount);
1475 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1476 atomic_inc(&cm_id_priv->work_count);
1477 spin_unlock_irq(&cm.lock);
1478out:
1479 return listen_cm_id_priv;
1480}
1481
1482/*
1483 * Work-around for inter-subnet connections. If the LIDs are permissive,
1484 * we need to override the LID/SL data in the REQ with the LID information
1485 * in the work completion.
1486 */
1487static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
1488{
1489 if (!cm_req_get_primary_subnet_local(req_msg)) {
1490 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) {
1491 req_msg->primary_local_lid = cpu_to_be16(wc->slid);
1492 cm_req_set_primary_sl(req_msg, wc->sl);
1493 }
1494
1495 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE)
1496 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1497 }
1498
1499 if (!cm_req_get_alt_subnet_local(req_msg)) {
1500 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) {
1501 req_msg->alt_local_lid = cpu_to_be16(wc->slid);
1502 cm_req_set_alt_sl(req_msg, wc->sl);
1503 }
1504
1505 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE)
1506 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1507 }
1508}
1509
1510static int cm_req_handler(struct cm_work *work)
1511{
1512 struct ib_cm_id *cm_id;
1513 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1514 struct cm_req_msg *req_msg;
1515 int ret;
1516
1517 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1518
1519 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
1520 if (IS_ERR(cm_id))
1521 return PTR_ERR(cm_id);
1522
1523 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1524 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1525 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1526 work->mad_recv_wc->recv_buf.grh,
1527 &cm_id_priv->av);
1528 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1529 id.local_id);
1530 if (IS_ERR(cm_id_priv->timewait_info)) {
1531 ret = PTR_ERR(cm_id_priv->timewait_info);
1532 goto destroy;
1533 }
1534 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1535 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1536 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1537
1538 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1539 if (!listen_cm_id_priv) {
1540 ret = -EINVAL;
1541 kfree(cm_id_priv->timewait_info);
1542 goto destroy;
1543 }
1544
1545 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1546 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1547 cm_id_priv->id.service_id = req_msg->service_id;
1548 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
1549
1550 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
1551 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1552 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1553 if (ret) {
1554 ib_get_cached_gid(work->port->cm_dev->ib_device,
1555 work->port->port_num, 0, &work->path[0].sgid);
1556 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1557 &work->path[0].sgid, sizeof work->path[0].sgid,
1558 NULL, 0);
1559 goto rejected;
1560 }
1561 if (req_msg->alt_local_lid) {
1562 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1563 if (ret) {
1564 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1565 &work->path[0].sgid,
1566 sizeof work->path[0].sgid, NULL, 0);
1567 goto rejected;
1568 }
1569 }
1570 cm_id_priv->tid = req_msg->hdr.tid;
1571 cm_id_priv->timeout_ms = cm_convert_to_ms(
1572 cm_req_get_local_resp_timeout(req_msg));
1573 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1574 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1575 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1576 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1577 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1578 cm_id_priv->pkey = req_msg->pkey;
1579 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1580 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1581 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1582 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1583
1584 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1585 cm_process_work(cm_id_priv, work);
1586 cm_deref_id(listen_cm_id_priv);
1587 return 0;
1588
1589rejected:
1590 atomic_dec(&cm_id_priv->refcount);
1591 cm_deref_id(listen_cm_id_priv);
1592destroy:
1593 ib_destroy_cm_id(cm_id);
1594 return ret;
1595}
1596
1597static void cm_format_rep(struct cm_rep_msg *rep_msg,
1598 struct cm_id_private *cm_id_priv,
1599 struct ib_cm_rep_param *param)
1600{
1601 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1602 rep_msg->local_comm_id = cm_id_priv->id.local_id;
1603 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1604 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1605 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1606 rep_msg->resp_resources = param->responder_resources;
1607 rep_msg->initiator_depth = param->initiator_depth;
1608 cm_rep_set_target_ack_delay(rep_msg,
1609 cm_id_priv->av.port->cm_dev->ack_delay);
1610 cm_rep_set_failover(rep_msg, param->failover_accepted);
1611 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1612 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1613 cm_rep_set_srq(rep_msg, param->srq);
1614 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1615
1616 if (param->private_data && param->private_data_len)
1617 memcpy(rep_msg->private_data, param->private_data,
1618 param->private_data_len);
1619}
1620
1621int ib_send_cm_rep(struct ib_cm_id *cm_id,
1622 struct ib_cm_rep_param *param)
1623{
1624 struct cm_id_private *cm_id_priv;
1625 struct ib_mad_send_buf *msg;
1626 struct cm_rep_msg *rep_msg;
1627 unsigned long flags;
1628 int ret;
1629
1630 if (param->private_data &&
1631 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1632 return -EINVAL;
1633
1634 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1635 spin_lock_irqsave(&cm_id_priv->lock, flags);
1636 if (cm_id->state != IB_CM_REQ_RCVD &&
1637 cm_id->state != IB_CM_MRA_REQ_SENT) {
1638 ret = -EINVAL;
1639 goto out;
1640 }
1641
1642 ret = cm_alloc_msg(cm_id_priv, &msg);
1643 if (ret)
1644 goto out;
1645
1646 rep_msg = (struct cm_rep_msg *) msg->mad;
1647 cm_format_rep(rep_msg, cm_id_priv, param);
1648 msg->timeout_ms = cm_id_priv->timeout_ms;
1649 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1650
1651 ret = ib_post_send_mad(msg, NULL);
1652 if (ret) {
1653 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1654 cm_free_msg(msg);
1655 return ret;
1656 }
1657
1658 cm_id->state = IB_CM_REP_SENT;
1659 cm_id_priv->msg = msg;
1660 cm_id_priv->initiator_depth = param->initiator_depth;
1661 cm_id_priv->responder_resources = param->responder_resources;
1662 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1663 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1664
1665out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1666 return ret;
1667}
1668EXPORT_SYMBOL(ib_send_cm_rep);
1669
1670static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1671 struct cm_id_private *cm_id_priv,
1672 const void *private_data,
1673 u8 private_data_len)
1674{
1675 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1676 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1677 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1678
1679 if (private_data && private_data_len)
1680 memcpy(rtu_msg->private_data, private_data, private_data_len);
1681}
1682
1683int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1684 const void *private_data,
1685 u8 private_data_len)
1686{
1687 struct cm_id_private *cm_id_priv;
1688 struct ib_mad_send_buf *msg;
1689 unsigned long flags;
1690 void *data;
1691 int ret;
1692
1693 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1694 return -EINVAL;
1695
1696 data = cm_copy_private_data(private_data, private_data_len);
1697 if (IS_ERR(data))
1698 return PTR_ERR(data);
1699
1700 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1701 spin_lock_irqsave(&cm_id_priv->lock, flags);
1702 if (cm_id->state != IB_CM_REP_RCVD &&
1703 cm_id->state != IB_CM_MRA_REP_SENT) {
1704 ret = -EINVAL;
1705 goto error;
1706 }
1707
1708 ret = cm_alloc_msg(cm_id_priv, &msg);
1709 if (ret)
1710 goto error;
1711
1712 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1713 private_data, private_data_len);
1714
1715 ret = ib_post_send_mad(msg, NULL);
1716 if (ret) {
1717 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1718 cm_free_msg(msg);
1719 kfree(data);
1720 return ret;
1721 }
1722
1723 cm_id->state = IB_CM_ESTABLISHED;
1724 cm_set_private_data(cm_id_priv, data, private_data_len);
1725 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1726 return 0;
1727
1728error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1729 kfree(data);
1730 return ret;
1731}
1732EXPORT_SYMBOL(ib_send_cm_rtu);
1733
1734static void cm_format_rep_event(struct cm_work *work)
1735{
1736 struct cm_rep_msg *rep_msg;
1737 struct ib_cm_rep_event_param *param;
1738
1739 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1740 param = &work->cm_event.param.rep_rcvd;
1741 param->remote_ca_guid = rep_msg->local_ca_guid;
1742 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1743 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1744 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1745 param->responder_resources = rep_msg->initiator_depth;
1746 param->initiator_depth = rep_msg->resp_resources;
1747 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1748 param->failover_accepted = cm_rep_get_failover(rep_msg);
1749 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1750 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1751 param->srq = cm_rep_get_srq(rep_msg);
1752 work->cm_event.private_data = &rep_msg->private_data;
1753}
1754
1755static void cm_dup_rep_handler(struct cm_work *work)
1756{
1757 struct cm_id_private *cm_id_priv;
1758 struct cm_rep_msg *rep_msg;
1759 struct ib_mad_send_buf *msg = NULL;
1760 int ret;
1761
1762 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1763 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1764 rep_msg->local_comm_id);
1765 if (!cm_id_priv)
1766 return;
1767
1768 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1769 counter[CM_REP_COUNTER]);
1770 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1771 if (ret)
1772 goto deref;
1773
1774 spin_lock_irq(&cm_id_priv->lock);
1775 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1776 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1777 cm_id_priv->private_data,
1778 cm_id_priv->private_data_len);
1779 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1780 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1781 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1782 cm_id_priv->private_data,
1783 cm_id_priv->private_data_len);
1784 else
1785 goto unlock;
1786 spin_unlock_irq(&cm_id_priv->lock);
1787
1788 ret = ib_post_send_mad(msg, NULL);
1789 if (ret)
1790 goto free;
1791 goto deref;
1792
1793unlock: spin_unlock_irq(&cm_id_priv->lock);
1794free: cm_free_msg(msg);
1795deref: cm_deref_id(cm_id_priv);
1796}
1797
1798static int cm_rep_handler(struct cm_work *work)
1799{
1800 struct cm_id_private *cm_id_priv;
1801 struct cm_rep_msg *rep_msg;
1802 int ret;
1803
1804 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1805 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1806 if (!cm_id_priv) {
1807 cm_dup_rep_handler(work);
1808 return -EINVAL;
1809 }
1810
1811 cm_format_rep_event(work);
1812
1813 spin_lock_irq(&cm_id_priv->lock);
1814 switch (cm_id_priv->id.state) {
1815 case IB_CM_REQ_SENT:
1816 case IB_CM_MRA_REQ_RCVD:
1817 break;
1818 default:
1819 spin_unlock_irq(&cm_id_priv->lock);
1820 ret = -EINVAL;
1821 goto error;
1822 }
1823
1824 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1825 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1826 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1827
1828 spin_lock(&cm.lock);
1829 /* Check for duplicate REP. */
1830 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1831 spin_unlock(&cm.lock);
1832 spin_unlock_irq(&cm_id_priv->lock);
1833 ret = -EINVAL;
1834 goto error;
1835 }
1836 /* Check for a stale connection. */
1837 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1838 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1839 &cm.remote_id_table);
1840 cm_id_priv->timewait_info->inserted_remote_id = 0;
1841 spin_unlock(&cm.lock);
1842 spin_unlock_irq(&cm_id_priv->lock);
1843 cm_issue_rej(work->port, work->mad_recv_wc,
1844 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1845 NULL, 0);
1846 ret = -EINVAL;
1847 goto error;
1848 }
1849 spin_unlock(&cm.lock);
1850
1851 cm_id_priv->id.state = IB_CM_REP_RCVD;
1852 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1853 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1854 cm_id_priv->initiator_depth = rep_msg->resp_resources;
1855 cm_id_priv->responder_resources = rep_msg->initiator_depth;
1856 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1857 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1858 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1859 cm_id_priv->av.timeout =
1860 cm_ack_timeout(cm_id_priv->target_ack_delay,
1861 cm_id_priv->av.timeout - 1);
1862 cm_id_priv->alt_av.timeout =
1863 cm_ack_timeout(cm_id_priv->target_ack_delay,
1864 cm_id_priv->alt_av.timeout - 1);
1865
1866 /* todo: handle peer_to_peer */
1867
1868 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1869 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1870 if (!ret)
1871 list_add_tail(&work->list, &cm_id_priv->work_list);
1872 spin_unlock_irq(&cm_id_priv->lock);
1873
1874 if (ret)
1875 cm_process_work(cm_id_priv, work);
1876 else
1877 cm_deref_id(cm_id_priv);
1878 return 0;
1879
1880error:
1881 cm_deref_id(cm_id_priv);
1882 return ret;
1883}
1884
1885static int cm_establish_handler(struct cm_work *work)
1886{
1887 struct cm_id_private *cm_id_priv;
1888 int ret;
1889
1890 /* See comment in cm_establish about lookup. */
1891 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1892 if (!cm_id_priv)
1893 return -EINVAL;
1894
1895 spin_lock_irq(&cm_id_priv->lock);
1896 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1897 spin_unlock_irq(&cm_id_priv->lock);
1898 goto out;
1899 }
1900
1901 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1902 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1903 if (!ret)
1904 list_add_tail(&work->list, &cm_id_priv->work_list);
1905 spin_unlock_irq(&cm_id_priv->lock);
1906
1907 if (ret)
1908 cm_process_work(cm_id_priv, work);
1909 else
1910 cm_deref_id(cm_id_priv);
1911 return 0;
1912out:
1913 cm_deref_id(cm_id_priv);
1914 return -EINVAL;
1915}
1916
1917static int cm_rtu_handler(struct cm_work *work)
1918{
1919 struct cm_id_private *cm_id_priv;
1920 struct cm_rtu_msg *rtu_msg;
1921 int ret;
1922
1923 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1924 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1925 rtu_msg->local_comm_id);
1926 if (!cm_id_priv)
1927 return -EINVAL;
1928
1929 work->cm_event.private_data = &rtu_msg->private_data;
1930
1931 spin_lock_irq(&cm_id_priv->lock);
1932 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1933 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1934 spin_unlock_irq(&cm_id_priv->lock);
1935 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1936 counter[CM_RTU_COUNTER]);
1937 goto out;
1938 }
1939 cm_id_priv->id.state = IB_CM_ESTABLISHED;
1940
1941 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1942 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1943 if (!ret)
1944 list_add_tail(&work->list, &cm_id_priv->work_list);
1945 spin_unlock_irq(&cm_id_priv->lock);
1946
1947 if (ret)
1948 cm_process_work(cm_id_priv, work);
1949 else
1950 cm_deref_id(cm_id_priv);
1951 return 0;
1952out:
1953 cm_deref_id(cm_id_priv);
1954 return -EINVAL;
1955}
1956
1957static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1958 struct cm_id_private *cm_id_priv,
1959 const void *private_data,
1960 u8 private_data_len)
1961{
1962 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1963 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1964 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1965 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1966 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1967
1968 if (private_data && private_data_len)
1969 memcpy(dreq_msg->private_data, private_data, private_data_len);
1970}
1971
1972int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1973 const void *private_data,
1974 u8 private_data_len)
1975{
1976 struct cm_id_private *cm_id_priv;
1977 struct ib_mad_send_buf *msg;
1978 unsigned long flags;
1979 int ret;
1980
1981 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1982 return -EINVAL;
1983
1984 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1985 spin_lock_irqsave(&cm_id_priv->lock, flags);
1986 if (cm_id->state != IB_CM_ESTABLISHED) {
1987 ret = -EINVAL;
1988 goto out;
1989 }
1990
1991 if (cm_id->lap_state == IB_CM_LAP_SENT ||
1992 cm_id->lap_state == IB_CM_MRA_LAP_RCVD)
1993 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1994
1995 ret = cm_alloc_msg(cm_id_priv, &msg);
1996 if (ret) {
1997 cm_enter_timewait(cm_id_priv);
1998 goto out;
1999 }
2000
2001 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2002 private_data, private_data_len);
2003 msg->timeout_ms = cm_id_priv->timeout_ms;
2004 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2005
2006 ret = ib_post_send_mad(msg, NULL);
2007 if (ret) {
2008 cm_enter_timewait(cm_id_priv);
2009 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2010 cm_free_msg(msg);
2011 return ret;
2012 }
2013
2014 cm_id->state = IB_CM_DREQ_SENT;
2015 cm_id_priv->msg = msg;
2016out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2017 return ret;
2018}
2019EXPORT_SYMBOL(ib_send_cm_dreq);
2020
2021static void cm_format_drep(struct cm_drep_msg *drep_msg,
2022 struct cm_id_private *cm_id_priv,
2023 const void *private_data,
2024 u8 private_data_len)
2025{
2026 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2027 drep_msg->local_comm_id = cm_id_priv->id.local_id;
2028 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
2029
2030 if (private_data && private_data_len)
2031 memcpy(drep_msg->private_data, private_data, private_data_len);
2032}
2033
2034int ib_send_cm_drep(struct ib_cm_id *cm_id,
2035 const void *private_data,
2036 u8 private_data_len)
2037{
2038 struct cm_id_private *cm_id_priv;
2039 struct ib_mad_send_buf *msg;
2040 unsigned long flags;
2041 void *data;
2042 int ret;
2043
2044 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2045 return -EINVAL;
2046
2047 data = cm_copy_private_data(private_data, private_data_len);
2048 if (IS_ERR(data))
2049 return PTR_ERR(data);
2050
2051 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2052 spin_lock_irqsave(&cm_id_priv->lock, flags);
2053 if (cm_id->state != IB_CM_DREQ_RCVD) {
2054 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2055 kfree(data);
2056 return -EINVAL;
2057 }
2058
2059 cm_set_private_data(cm_id_priv, data, private_data_len);
2060 cm_enter_timewait(cm_id_priv);
2061
2062 ret = cm_alloc_msg(cm_id_priv, &msg);
2063 if (ret)
2064 goto out;
2065
2066 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2067 private_data, private_data_len);
2068
2069 ret = ib_post_send_mad(msg, NULL);
2070 if (ret) {
2071 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2072 cm_free_msg(msg);
2073 return ret;
2074 }
2075
2076out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2077 return ret;
2078}
2079EXPORT_SYMBOL(ib_send_cm_drep);
2080
2081static int cm_issue_drep(struct cm_port *port,
2082 struct ib_mad_recv_wc *mad_recv_wc)
2083{
2084 struct ib_mad_send_buf *msg = NULL;
2085 struct cm_dreq_msg *dreq_msg;
2086 struct cm_drep_msg *drep_msg;
2087 int ret;
2088
2089 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2090 if (ret)
2091 return ret;
2092
2093 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2094 drep_msg = (struct cm_drep_msg *) msg->mad;
2095
2096 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2097 drep_msg->remote_comm_id = dreq_msg->local_comm_id;
2098 drep_msg->local_comm_id = dreq_msg->remote_comm_id;
2099
2100 ret = ib_post_send_mad(msg, NULL);
2101 if (ret)
2102 cm_free_msg(msg);
2103
2104 return ret;
2105}
2106
2107static int cm_dreq_handler(struct cm_work *work)
2108{
2109 struct cm_id_private *cm_id_priv;
2110 struct cm_dreq_msg *dreq_msg;
2111 struct ib_mad_send_buf *msg = NULL;
2112 int ret;
2113
2114 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2115 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
2116 dreq_msg->local_comm_id);
2117 if (!cm_id_priv) {
2118 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2119 counter[CM_DREQ_COUNTER]);
2120 cm_issue_drep(work->port, work->mad_recv_wc);
2121 return -EINVAL;
2122 }
2123
2124 work->cm_event.private_data = &dreq_msg->private_data;
2125
2126 spin_lock_irq(&cm_id_priv->lock);
2127 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
2128 goto unlock;
2129
2130 switch (cm_id_priv->id.state) {
2131 case IB_CM_REP_SENT:
2132 case IB_CM_DREQ_SENT:
2133 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2134 break;
2135 case IB_CM_ESTABLISHED:
2136 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2137 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2138 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2139 break;
2140 case IB_CM_MRA_REP_RCVD:
2141 break;
2142 case IB_CM_TIMEWAIT:
2143 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2144 counter[CM_DREQ_COUNTER]);
2145 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2146 goto unlock;
2147
2148 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2149 cm_id_priv->private_data,
2150 cm_id_priv->private_data_len);
2151 spin_unlock_irq(&cm_id_priv->lock);
2152
2153 if (ib_post_send_mad(msg, NULL))
2154 cm_free_msg(msg);
2155 goto deref;
2156 case IB_CM_DREQ_RCVD:
2157 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2158 counter[CM_DREQ_COUNTER]);
2159 goto unlock;
2160 default:
2161 goto unlock;
2162 }
2163 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2164 cm_id_priv->tid = dreq_msg->hdr.tid;
2165 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2166 if (!ret)
2167 list_add_tail(&work->list, &cm_id_priv->work_list);
2168 spin_unlock_irq(&cm_id_priv->lock);
2169
2170 if (ret)
2171 cm_process_work(cm_id_priv, work);
2172 else
2173 cm_deref_id(cm_id_priv);
2174 return 0;
2175
2176unlock: spin_unlock_irq(&cm_id_priv->lock);
2177deref: cm_deref_id(cm_id_priv);
2178 return -EINVAL;
2179}
2180
2181static int cm_drep_handler(struct cm_work *work)
2182{
2183 struct cm_id_private *cm_id_priv;
2184 struct cm_drep_msg *drep_msg;
2185 int ret;
2186
2187 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2188 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2189 drep_msg->local_comm_id);
2190 if (!cm_id_priv)
2191 return -EINVAL;
2192
2193 work->cm_event.private_data = &drep_msg->private_data;
2194
2195 spin_lock_irq(&cm_id_priv->lock);
2196 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2197 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2198 spin_unlock_irq(&cm_id_priv->lock);
2199 goto out;
2200 }
2201 cm_enter_timewait(cm_id_priv);
2202
2203 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2204 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2205 if (!ret)
2206 list_add_tail(&work->list, &cm_id_priv->work_list);
2207 spin_unlock_irq(&cm_id_priv->lock);
2208
2209 if (ret)
2210 cm_process_work(cm_id_priv, work);
2211 else
2212 cm_deref_id(cm_id_priv);
2213 return 0;
2214out:
2215 cm_deref_id(cm_id_priv);
2216 return -EINVAL;
2217}
2218
2219int ib_send_cm_rej(struct ib_cm_id *cm_id,
2220 enum ib_cm_rej_reason reason,
2221 void *ari,
2222 u8 ari_length,
2223 const void *private_data,
2224 u8 private_data_len)
2225{
2226 struct cm_id_private *cm_id_priv;
2227 struct ib_mad_send_buf *msg;
2228 unsigned long flags;
2229 int ret;
2230
2231 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2232 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2233 return -EINVAL;
2234
2235 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2236
2237 spin_lock_irqsave(&cm_id_priv->lock, flags);
2238 switch (cm_id->state) {
2239 case IB_CM_REQ_SENT:
2240 case IB_CM_MRA_REQ_RCVD:
2241 case IB_CM_REQ_RCVD:
2242 case IB_CM_MRA_REQ_SENT:
2243 case IB_CM_REP_RCVD:
2244 case IB_CM_MRA_REP_SENT:
2245 ret = cm_alloc_msg(cm_id_priv, &msg);
2246 if (!ret)
2247 cm_format_rej((struct cm_rej_msg *) msg->mad,
2248 cm_id_priv, reason, ari, ari_length,
2249 private_data, private_data_len);
2250
2251 cm_reset_to_idle(cm_id_priv);
2252 break;
2253 case IB_CM_REP_SENT:
2254 case IB_CM_MRA_REP_RCVD:
2255 ret = cm_alloc_msg(cm_id_priv, &msg);
2256 if (!ret)
2257 cm_format_rej((struct cm_rej_msg *) msg->mad,
2258 cm_id_priv, reason, ari, ari_length,
2259 private_data, private_data_len);
2260
2261 cm_enter_timewait(cm_id_priv);
2262 break;
2263 default:
2264 ret = -EINVAL;
2265 goto out;
2266 }
2267
2268 if (ret)
2269 goto out;
2270
2271 ret = ib_post_send_mad(msg, NULL);
2272 if (ret)
2273 cm_free_msg(msg);
2274
2275out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2276 return ret;
2277}
2278EXPORT_SYMBOL(ib_send_cm_rej);
2279
2280static void cm_format_rej_event(struct cm_work *work)
2281{
2282 struct cm_rej_msg *rej_msg;
2283 struct ib_cm_rej_event_param *param;
2284
2285 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2286 param = &work->cm_event.param.rej_rcvd;
2287 param->ari = rej_msg->ari;
2288 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2289 param->reason = __be16_to_cpu(rej_msg->reason);
2290 work->cm_event.private_data = &rej_msg->private_data;
2291}
2292
2293static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2294{
2295 struct cm_timewait_info *timewait_info;
2296 struct cm_id_private *cm_id_priv;
2297 __be32 remote_id;
2298
2299 remote_id = rej_msg->local_comm_id;
2300
2301 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2302 spin_lock_irq(&cm.lock);
2303 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2304 remote_id);
2305 if (!timewait_info) {
2306 spin_unlock_irq(&cm.lock);
2307 return NULL;
2308 }
2309 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2310 (timewait_info->work.local_id ^
2311 cm.random_id_operand));
2312 if (cm_id_priv) {
2313 if (cm_id_priv->id.remote_id == remote_id)
2314 atomic_inc(&cm_id_priv->refcount);
2315 else
2316 cm_id_priv = NULL;
2317 }
2318 spin_unlock_irq(&cm.lock);
2319 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2320 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2321 else
2322 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2323
2324 return cm_id_priv;
2325}
2326
2327static int cm_rej_handler(struct cm_work *work)
2328{
2329 struct cm_id_private *cm_id_priv;
2330 struct cm_rej_msg *rej_msg;
2331 int ret;
2332
2333 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2334 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2335 if (!cm_id_priv)
2336 return -EINVAL;
2337
2338 cm_format_rej_event(work);
2339
2340 spin_lock_irq(&cm_id_priv->lock);
2341 switch (cm_id_priv->id.state) {
2342 case IB_CM_REQ_SENT:
2343 case IB_CM_MRA_REQ_RCVD:
2344 case IB_CM_REP_SENT:
2345 case IB_CM_MRA_REP_RCVD:
2346 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2347 /* fall through */
2348 case IB_CM_REQ_RCVD:
2349 case IB_CM_MRA_REQ_SENT:
2350 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2351 cm_enter_timewait(cm_id_priv);
2352 else
2353 cm_reset_to_idle(cm_id_priv);
2354 break;
2355 case IB_CM_DREQ_SENT:
2356 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2357 /* fall through */
2358 case IB_CM_REP_RCVD:
2359 case IB_CM_MRA_REP_SENT:
2360 cm_enter_timewait(cm_id_priv);
2361 break;
2362 case IB_CM_ESTABLISHED:
2363 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
2364 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
2365 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
2366 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2367 cm_id_priv->msg);
2368 cm_enter_timewait(cm_id_priv);
2369 break;
2370 }
2371 /* fall through */
2372 default:
2373 spin_unlock_irq(&cm_id_priv->lock);
2374 ret = -EINVAL;
2375 goto out;
2376 }
2377
2378 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2379 if (!ret)
2380 list_add_tail(&work->list, &cm_id_priv->work_list);
2381 spin_unlock_irq(&cm_id_priv->lock);
2382
2383 if (ret)
2384 cm_process_work(cm_id_priv, work);
2385 else
2386 cm_deref_id(cm_id_priv);
2387 return 0;
2388out:
2389 cm_deref_id(cm_id_priv);
2390 return -EINVAL;
2391}
2392
2393int ib_send_cm_mra(struct ib_cm_id *cm_id,
2394 u8 service_timeout,
2395 const void *private_data,
2396 u8 private_data_len)
2397{
2398 struct cm_id_private *cm_id_priv;
2399 struct ib_mad_send_buf *msg;
2400 enum ib_cm_state cm_state;
2401 enum ib_cm_lap_state lap_state;
2402 enum cm_msg_response msg_response;
2403 void *data;
2404 unsigned long flags;
2405 int ret;
2406
2407 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2408 return -EINVAL;
2409
2410 data = cm_copy_private_data(private_data, private_data_len);
2411 if (IS_ERR(data))
2412 return PTR_ERR(data);
2413
2414 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2415
2416 spin_lock_irqsave(&cm_id_priv->lock, flags);
2417 switch(cm_id_priv->id.state) {
2418 case IB_CM_REQ_RCVD:
2419 cm_state = IB_CM_MRA_REQ_SENT;
2420 lap_state = cm_id->lap_state;
2421 msg_response = CM_MSG_RESPONSE_REQ;
2422 break;
2423 case IB_CM_REP_RCVD:
2424 cm_state = IB_CM_MRA_REP_SENT;
2425 lap_state = cm_id->lap_state;
2426 msg_response = CM_MSG_RESPONSE_REP;
2427 break;
2428 case IB_CM_ESTABLISHED:
2429 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
2430 cm_state = cm_id->state;
2431 lap_state = IB_CM_MRA_LAP_SENT;
2432 msg_response = CM_MSG_RESPONSE_OTHER;
2433 break;
2434 }
2435 default:
2436 ret = -EINVAL;
2437 goto error1;
2438 }
2439
2440 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
2441 ret = cm_alloc_msg(cm_id_priv, &msg);
2442 if (ret)
2443 goto error1;
2444
2445 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2446 msg_response, service_timeout,
2447 private_data, private_data_len);
2448 ret = ib_post_send_mad(msg, NULL);
2449 if (ret)
2450 goto error2;
2451 }
2452
2453 cm_id->state = cm_state;
2454 cm_id->lap_state = lap_state;
2455 cm_id_priv->service_timeout = service_timeout;
2456 cm_set_private_data(cm_id_priv, data, private_data_len);
2457 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2458 return 0;
2459
2460error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2461 kfree(data);
2462 return ret;
2463
2464error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2465 kfree(data);
2466 cm_free_msg(msg);
2467 return ret;
2468}
2469EXPORT_SYMBOL(ib_send_cm_mra);
2470
2471static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2472{
2473 switch (cm_mra_get_msg_mraed(mra_msg)) {
2474 case CM_MSG_RESPONSE_REQ:
2475 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2476 case CM_MSG_RESPONSE_REP:
2477 case CM_MSG_RESPONSE_OTHER:
2478 return cm_acquire_id(mra_msg->remote_comm_id,
2479 mra_msg->local_comm_id);
2480 default:
2481 return NULL;
2482 }
2483}
2484
2485static int cm_mra_handler(struct cm_work *work)
2486{
2487 struct cm_id_private *cm_id_priv;
2488 struct cm_mra_msg *mra_msg;
2489 int timeout, ret;
2490
2491 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2492 cm_id_priv = cm_acquire_mraed_id(mra_msg);
2493 if (!cm_id_priv)
2494 return -EINVAL;
2495
2496 work->cm_event.private_data = &mra_msg->private_data;
2497 work->cm_event.param.mra_rcvd.service_timeout =
2498 cm_mra_get_service_timeout(mra_msg);
2499 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2500 cm_convert_to_ms(cm_id_priv->av.timeout);
2501
2502 spin_lock_irq(&cm_id_priv->lock);
2503 switch (cm_id_priv->id.state) {
2504 case IB_CM_REQ_SENT:
2505 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2506 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2507 cm_id_priv->msg, timeout))
2508 goto out;
2509 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2510 break;
2511 case IB_CM_REP_SENT:
2512 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2513 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2514 cm_id_priv->msg, timeout))
2515 goto out;
2516 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2517 break;
2518 case IB_CM_ESTABLISHED:
2519 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2520 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2521 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2522 cm_id_priv->msg, timeout)) {
2523 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2524 atomic_long_inc(&work->port->
2525 counter_group[CM_RECV_DUPLICATES].
2526 counter[CM_MRA_COUNTER]);
2527 goto out;
2528 }
2529 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2530 break;
2531 case IB_CM_MRA_REQ_RCVD:
2532 case IB_CM_MRA_REP_RCVD:
2533 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2534 counter[CM_MRA_COUNTER]);
2535 /* fall through */
2536 default:
2537 goto out;
2538 }
2539
2540 cm_id_priv->msg->context[1] = (void *) (unsigned long)
2541 cm_id_priv->id.state;
2542 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2543 if (!ret)
2544 list_add_tail(&work->list, &cm_id_priv->work_list);
2545 spin_unlock_irq(&cm_id_priv->lock);
2546
2547 if (ret)
2548 cm_process_work(cm_id_priv, work);
2549 else
2550 cm_deref_id(cm_id_priv);
2551 return 0;
2552out:
2553 spin_unlock_irq(&cm_id_priv->lock);
2554 cm_deref_id(cm_id_priv);
2555 return -EINVAL;
2556}
2557
2558static void cm_format_lap(struct cm_lap_msg *lap_msg,
2559 struct cm_id_private *cm_id_priv,
2560 struct ib_sa_path_rec *alternate_path,
2561 const void *private_data,
2562 u8 private_data_len)
2563{
2564 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2565 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2566 lap_msg->local_comm_id = cm_id_priv->id.local_id;
2567 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2568 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2569 /* todo: need remote CM response timeout */
2570 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2571 lap_msg->alt_local_lid = alternate_path->slid;
2572 lap_msg->alt_remote_lid = alternate_path->dlid;
2573 lap_msg->alt_local_gid = alternate_path->sgid;
2574 lap_msg->alt_remote_gid = alternate_path->dgid;
2575 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2576 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2577 lap_msg->alt_hop_limit = alternate_path->hop_limit;
2578 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2579 cm_lap_set_sl(lap_msg, alternate_path->sl);
2580 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2581 cm_lap_set_local_ack_timeout(lap_msg,
2582 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
2583 alternate_path->packet_life_time));
2584
2585 if (private_data && private_data_len)
2586 memcpy(lap_msg->private_data, private_data, private_data_len);
2587}
2588
2589int ib_send_cm_lap(struct ib_cm_id *cm_id,
2590 struct ib_sa_path_rec *alternate_path,
2591 const void *private_data,
2592 u8 private_data_len)
2593{
2594 struct cm_id_private *cm_id_priv;
2595 struct ib_mad_send_buf *msg;
2596 unsigned long flags;
2597 int ret;
2598
2599 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2600 return -EINVAL;
2601
2602 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2603 spin_lock_irqsave(&cm_id_priv->lock, flags);
2604 if (cm_id->state != IB_CM_ESTABLISHED ||
2605 (cm_id->lap_state != IB_CM_LAP_UNINIT &&
2606 cm_id->lap_state != IB_CM_LAP_IDLE)) {
2607 ret = -EINVAL;
2608 goto out;
2609 }
2610
2611 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av);
2612 if (ret)
2613 goto out;
2614 cm_id_priv->alt_av.timeout =
2615 cm_ack_timeout(cm_id_priv->target_ack_delay,
2616 cm_id_priv->alt_av.timeout - 1);
2617
2618 ret = cm_alloc_msg(cm_id_priv, &msg);
2619 if (ret)
2620 goto out;
2621
2622 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2623 alternate_path, private_data, private_data_len);
2624 msg->timeout_ms = cm_id_priv->timeout_ms;
2625 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2626
2627 ret = ib_post_send_mad(msg, NULL);
2628 if (ret) {
2629 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2630 cm_free_msg(msg);
2631 return ret;
2632 }
2633
2634 cm_id->lap_state = IB_CM_LAP_SENT;
2635 cm_id_priv->msg = msg;
2636
2637out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2638 return ret;
2639}
2640EXPORT_SYMBOL(ib_send_cm_lap);
2641
2642static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
2643 struct ib_sa_path_rec *path,
2644 struct cm_lap_msg *lap_msg)
2645{
2646 memset(path, 0, sizeof *path);
2647 path->dgid = lap_msg->alt_local_gid;
2648 path->sgid = lap_msg->alt_remote_gid;
2649 path->dlid = lap_msg->alt_local_lid;
2650 path->slid = lap_msg->alt_remote_lid;
2651 path->flow_label = cm_lap_get_flow_label(lap_msg);
2652 path->hop_limit = lap_msg->alt_hop_limit;
2653 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2654 path->reversible = 1;
2655 path->pkey = cm_id_priv->pkey;
2656 path->sl = cm_lap_get_sl(lap_msg);
2657 path->mtu_selector = IB_SA_EQ;
2658 path->mtu = cm_id_priv->path_mtu;
2659 path->rate_selector = IB_SA_EQ;
2660 path->rate = cm_lap_get_packet_rate(lap_msg);
2661 path->packet_life_time_selector = IB_SA_EQ;
2662 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2663 path->packet_life_time -= (path->packet_life_time > 0);
2664}
2665
2666static int cm_lap_handler(struct cm_work *work)
2667{
2668 struct cm_id_private *cm_id_priv;
2669 struct cm_lap_msg *lap_msg;
2670 struct ib_cm_lap_event_param *param;
2671 struct ib_mad_send_buf *msg = NULL;
2672 int ret;
2673
2674 /* todo: verify LAP request and send reject APR if invalid. */
2675 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2676 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2677 lap_msg->local_comm_id);
2678 if (!cm_id_priv)
2679 return -EINVAL;
2680
2681 param = &work->cm_event.param.lap_rcvd;
2682 param->alternate_path = &work->path[0];
2683 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
2684 work->cm_event.private_data = &lap_msg->private_data;
2685
2686 spin_lock_irq(&cm_id_priv->lock);
2687 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2688 goto unlock;
2689
2690 switch (cm_id_priv->id.lap_state) {
2691 case IB_CM_LAP_UNINIT:
2692 case IB_CM_LAP_IDLE:
2693 break;
2694 case IB_CM_MRA_LAP_SENT:
2695 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2696 counter[CM_LAP_COUNTER]);
2697 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2698 goto unlock;
2699
2700 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2701 CM_MSG_RESPONSE_OTHER,
2702 cm_id_priv->service_timeout,
2703 cm_id_priv->private_data,
2704 cm_id_priv->private_data_len);
2705 spin_unlock_irq(&cm_id_priv->lock);
2706
2707 if (ib_post_send_mad(msg, NULL))
2708 cm_free_msg(msg);
2709 goto deref;
2710 case IB_CM_LAP_RCVD:
2711 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2712 counter[CM_LAP_COUNTER]);
2713 goto unlock;
2714 default:
2715 goto unlock;
2716 }
2717
2718 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2719 cm_id_priv->tid = lap_msg->hdr.tid;
2720 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2721 work->mad_recv_wc->recv_buf.grh,
2722 &cm_id_priv->av);
2723 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av);
2724 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2725 if (!ret)
2726 list_add_tail(&work->list, &cm_id_priv->work_list);
2727 spin_unlock_irq(&cm_id_priv->lock);
2728
2729 if (ret)
2730 cm_process_work(cm_id_priv, work);
2731 else
2732 cm_deref_id(cm_id_priv);
2733 return 0;
2734
2735unlock: spin_unlock_irq(&cm_id_priv->lock);
2736deref: cm_deref_id(cm_id_priv);
2737 return -EINVAL;
2738}
2739
2740static void cm_format_apr(struct cm_apr_msg *apr_msg,
2741 struct cm_id_private *cm_id_priv,
2742 enum ib_cm_apr_status status,
2743 void *info,
2744 u8 info_length,
2745 const void *private_data,
2746 u8 private_data_len)
2747{
2748 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2749 apr_msg->local_comm_id = cm_id_priv->id.local_id;
2750 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2751 apr_msg->ap_status = (u8) status;
2752
2753 if (info && info_length) {
2754 apr_msg->info_length = info_length;
2755 memcpy(apr_msg->info, info, info_length);
2756 }
2757
2758 if (private_data && private_data_len)
2759 memcpy(apr_msg->private_data, private_data, private_data_len);
2760}
2761
2762int ib_send_cm_apr(struct ib_cm_id *cm_id,
2763 enum ib_cm_apr_status status,
2764 void *info,
2765 u8 info_length,
2766 const void *private_data,
2767 u8 private_data_len)
2768{
2769 struct cm_id_private *cm_id_priv;
2770 struct ib_mad_send_buf *msg;
2771 unsigned long flags;
2772 int ret;
2773
2774 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2775 (info && info_length > IB_CM_APR_INFO_LENGTH))
2776 return -EINVAL;
2777
2778 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2779 spin_lock_irqsave(&cm_id_priv->lock, flags);
2780 if (cm_id->state != IB_CM_ESTABLISHED ||
2781 (cm_id->lap_state != IB_CM_LAP_RCVD &&
2782 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2783 ret = -EINVAL;
2784 goto out;
2785 }
2786
2787 ret = cm_alloc_msg(cm_id_priv, &msg);
2788 if (ret)
2789 goto out;
2790
2791 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2792 info, info_length, private_data, private_data_len);
2793 ret = ib_post_send_mad(msg, NULL);
2794 if (ret) {
2795 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2796 cm_free_msg(msg);
2797 return ret;
2798 }
2799
2800 cm_id->lap_state = IB_CM_LAP_IDLE;
2801out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2802 return ret;
2803}
2804EXPORT_SYMBOL(ib_send_cm_apr);
2805
2806static int cm_apr_handler(struct cm_work *work)
2807{
2808 struct cm_id_private *cm_id_priv;
2809 struct cm_apr_msg *apr_msg;
2810 int ret;
2811
2812 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2813 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2814 apr_msg->local_comm_id);
2815 if (!cm_id_priv)
2816 return -EINVAL; /* Unmatched reply. */
2817
2818 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2819 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2820 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2821 work->cm_event.private_data = &apr_msg->private_data;
2822
2823 spin_lock_irq(&cm_id_priv->lock);
2824 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2825 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2826 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2827 spin_unlock_irq(&cm_id_priv->lock);
2828 goto out;
2829 }
2830 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2831 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2832 cm_id_priv->msg = NULL;
2833
2834 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2835 if (!ret)
2836 list_add_tail(&work->list, &cm_id_priv->work_list);
2837 spin_unlock_irq(&cm_id_priv->lock);
2838
2839 if (ret)
2840 cm_process_work(cm_id_priv, work);
2841 else
2842 cm_deref_id(cm_id_priv);
2843 return 0;
2844out:
2845 cm_deref_id(cm_id_priv);
2846 return -EINVAL;
2847}
2848
2849static int cm_timewait_handler(struct cm_work *work)
2850{
2851 struct cm_timewait_info *timewait_info;
2852 struct cm_id_private *cm_id_priv;
2853 int ret;
2854
2855 timewait_info = (struct cm_timewait_info *)work;
2856 spin_lock_irq(&cm.lock);
2857 list_del(&timewait_info->list);
2858 spin_unlock_irq(&cm.lock);
2859
2860 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2861 timewait_info->work.remote_id);
2862 if (!cm_id_priv)
2863 return -EINVAL;
2864
2865 spin_lock_irq(&cm_id_priv->lock);
2866 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2867 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2868 spin_unlock_irq(&cm_id_priv->lock);
2869 goto out;
2870 }
2871 cm_id_priv->id.state = IB_CM_IDLE;
2872 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2873 if (!ret)
2874 list_add_tail(&work->list, &cm_id_priv->work_list);
2875 spin_unlock_irq(&cm_id_priv->lock);
2876
2877 if (ret)
2878 cm_process_work(cm_id_priv, work);
2879 else
2880 cm_deref_id(cm_id_priv);
2881 return 0;
2882out:
2883 cm_deref_id(cm_id_priv);
2884 return -EINVAL;
2885}
2886
2887static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2888 struct cm_id_private *cm_id_priv,
2889 struct ib_cm_sidr_req_param *param)
2890{
2891 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2892 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2893 sidr_req_msg->request_id = cm_id_priv->id.local_id;
2894 sidr_req_msg->pkey = param->path->pkey;
2895 sidr_req_msg->service_id = param->service_id;
2896
2897 if (param->private_data && param->private_data_len)
2898 memcpy(sidr_req_msg->private_data, param->private_data,
2899 param->private_data_len);
2900}
2901
2902int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2903 struct ib_cm_sidr_req_param *param)
2904{
2905 struct cm_id_private *cm_id_priv;
2906 struct ib_mad_send_buf *msg;
2907 unsigned long flags;
2908 int ret;
2909
2910 if (!param->path || (param->private_data &&
2911 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2912 return -EINVAL;
2913
2914 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2915 ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2916 if (ret)
2917 goto out;
2918
2919 cm_id->service_id = param->service_id;
2920 cm_id->service_mask = ~cpu_to_be64(0);
2921 cm_id_priv->timeout_ms = param->timeout_ms;
2922 cm_id_priv->max_cm_retries = param->max_cm_retries;
2923 ret = cm_alloc_msg(cm_id_priv, &msg);
2924 if (ret)
2925 goto out;
2926
2927 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2928 param);
2929 msg->timeout_ms = cm_id_priv->timeout_ms;
2930 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2931
2932 spin_lock_irqsave(&cm_id_priv->lock, flags);
2933 if (cm_id->state == IB_CM_IDLE)
2934 ret = ib_post_send_mad(msg, NULL);
2935 else
2936 ret = -EINVAL;
2937
2938 if (ret) {
2939 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2940 cm_free_msg(msg);
2941 goto out;
2942 }
2943 cm_id->state = IB_CM_SIDR_REQ_SENT;
2944 cm_id_priv->msg = msg;
2945 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2946out:
2947 return ret;
2948}
2949EXPORT_SYMBOL(ib_send_cm_sidr_req);
2950
2951static void cm_format_sidr_req_event(struct cm_work *work,
2952 struct ib_cm_id *listen_id)
2953{
2954 struct cm_sidr_req_msg *sidr_req_msg;
2955 struct ib_cm_sidr_req_event_param *param;
2956
2957 sidr_req_msg = (struct cm_sidr_req_msg *)
2958 work->mad_recv_wc->recv_buf.mad;
2959 param = &work->cm_event.param.sidr_req_rcvd;
2960 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2961 param->listen_id = listen_id;
2962 param->port = work->port->port_num;
2963 work->cm_event.private_data = &sidr_req_msg->private_data;
2964}
2965
2966static int cm_sidr_req_handler(struct cm_work *work)
2967{
2968 struct ib_cm_id *cm_id;
2969 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2970 struct cm_sidr_req_msg *sidr_req_msg;
2971 struct ib_wc *wc;
2972
2973 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
2974 if (IS_ERR(cm_id))
2975 return PTR_ERR(cm_id);
2976 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2977
2978 /* Record SGID/SLID and request ID for lookup. */
2979 sidr_req_msg = (struct cm_sidr_req_msg *)
2980 work->mad_recv_wc->recv_buf.mad;
2981 wc = work->mad_recv_wc->wc;
2982 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2983 cm_id_priv->av.dgid.global.interface_id = 0;
2984 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2985 work->mad_recv_wc->recv_buf.grh,
2986 &cm_id_priv->av);
2987 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2988 cm_id_priv->tid = sidr_req_msg->hdr.tid;
2989 atomic_inc(&cm_id_priv->work_count);
2990
2991 spin_lock_irq(&cm.lock);
2992 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2993 if (cur_cm_id_priv) {
2994 spin_unlock_irq(&cm.lock);
2995 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2996 counter[CM_SIDR_REQ_COUNTER]);
2997 goto out; /* Duplicate message. */
2998 }
2999 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3000 cur_cm_id_priv = cm_find_listen(cm_id->device,
3001 sidr_req_msg->service_id,
3002 sidr_req_msg->private_data);
3003 if (!cur_cm_id_priv) {
3004 spin_unlock_irq(&cm.lock);
3005 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED);
3006 goto out; /* No match. */
3007 }
3008 atomic_inc(&cur_cm_id_priv->refcount);
3009 atomic_inc(&cm_id_priv->refcount);
3010 spin_unlock_irq(&cm.lock);
3011
3012 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
3013 cm_id_priv->id.context = cur_cm_id_priv->id.context;
3014 cm_id_priv->id.service_id = sidr_req_msg->service_id;
3015 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3016
3017 cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
3018 cm_process_work(cm_id_priv, work);
3019 cm_deref_id(cur_cm_id_priv);
3020 return 0;
3021out:
3022 ib_destroy_cm_id(&cm_id_priv->id);
3023 return -EINVAL;
3024}
3025
3026static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3027 struct cm_id_private *cm_id_priv,
3028 struct ib_cm_sidr_rep_param *param)
3029{
3030 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3031 cm_id_priv->tid);
3032 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
3033 sidr_rep_msg->status = param->status;
3034 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
3035 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
3036 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
3037
3038 if (param->info && param->info_length)
3039 memcpy(sidr_rep_msg->info, param->info, param->info_length);
3040
3041 if (param->private_data && param->private_data_len)
3042 memcpy(sidr_rep_msg->private_data, param->private_data,
3043 param->private_data_len);
3044}
3045
3046int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3047 struct ib_cm_sidr_rep_param *param)
3048{
3049 struct cm_id_private *cm_id_priv;
3050 struct ib_mad_send_buf *msg;
3051 unsigned long flags;
3052 int ret;
3053
3054 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3055 (param->private_data &&
3056 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3057 return -EINVAL;
3058
3059 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3060 spin_lock_irqsave(&cm_id_priv->lock, flags);
3061 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
3062 ret = -EINVAL;
3063 goto error;
3064 }
3065
3066 ret = cm_alloc_msg(cm_id_priv, &msg);
3067 if (ret)
3068 goto error;
3069
3070 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3071 param);
3072 ret = ib_post_send_mad(msg, NULL);
3073 if (ret) {
3074 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3075 cm_free_msg(msg);
3076 return ret;
3077 }
3078 cm_id->state = IB_CM_IDLE;
3079 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3080
3081 spin_lock_irqsave(&cm.lock, flags);
3082 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3083 spin_unlock_irqrestore(&cm.lock, flags);
3084 return 0;
3085
3086error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3087 return ret;
3088}
3089EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3090
3091static void cm_format_sidr_rep_event(struct cm_work *work)
3092{
3093 struct cm_sidr_rep_msg *sidr_rep_msg;
3094 struct ib_cm_sidr_rep_event_param *param;
3095
3096 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3097 work->mad_recv_wc->recv_buf.mad;
3098 param = &work->cm_event.param.sidr_rep_rcvd;
3099 param->status = sidr_rep_msg->status;
3100 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
3101 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
3102 param->info = &sidr_rep_msg->info;
3103 param->info_len = sidr_rep_msg->info_length;
3104 work->cm_event.private_data = &sidr_rep_msg->private_data;
3105}
3106
3107static int cm_sidr_rep_handler(struct cm_work *work)
3108{
3109 struct cm_sidr_rep_msg *sidr_rep_msg;
3110 struct cm_id_private *cm_id_priv;
3111
3112 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3113 work->mad_recv_wc->recv_buf.mad;
3114 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
3115 if (!cm_id_priv)
3116 return -EINVAL; /* Unmatched reply. */
3117
3118 spin_lock_irq(&cm_id_priv->lock);
3119 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3120 spin_unlock_irq(&cm_id_priv->lock);
3121 goto out;
3122 }
3123 cm_id_priv->id.state = IB_CM_IDLE;
3124 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3125 spin_unlock_irq(&cm_id_priv->lock);
3126
3127 cm_format_sidr_rep_event(work);
3128 cm_process_work(cm_id_priv, work);
3129 return 0;
3130out:
3131 cm_deref_id(cm_id_priv);
3132 return -EINVAL;
3133}
3134
3135static void cm_process_send_error(struct ib_mad_send_buf *msg,
3136 enum ib_wc_status wc_status)
3137{
3138 struct cm_id_private *cm_id_priv;
3139 struct ib_cm_event cm_event;
3140 enum ib_cm_state state;
3141 int ret;
3142
3143 memset(&cm_event, 0, sizeof cm_event);
3144 cm_id_priv = msg->context[0];
3145
3146 /* Discard old sends or ones without a response. */
3147 spin_lock_irq(&cm_id_priv->lock);
3148 state = (enum ib_cm_state) (unsigned long) msg->context[1];
3149 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3150 goto discard;
3151
3152 switch (state) {
3153 case IB_CM_REQ_SENT:
3154 case IB_CM_MRA_REQ_RCVD:
3155 cm_reset_to_idle(cm_id_priv);
3156 cm_event.event = IB_CM_REQ_ERROR;
3157 break;
3158 case IB_CM_REP_SENT:
3159 case IB_CM_MRA_REP_RCVD:
3160 cm_reset_to_idle(cm_id_priv);
3161 cm_event.event = IB_CM_REP_ERROR;
3162 break;
3163 case IB_CM_DREQ_SENT:
3164 cm_enter_timewait(cm_id_priv);
3165 cm_event.event = IB_CM_DREQ_ERROR;
3166 break;
3167 case IB_CM_SIDR_REQ_SENT:
3168 cm_id_priv->id.state = IB_CM_IDLE;
3169 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3170 break;
3171 default:
3172 goto discard;
3173 }
3174 spin_unlock_irq(&cm_id_priv->lock);
3175 cm_event.param.send_status = wc_status;
3176
3177 /* No other events can occur on the cm_id at this point. */
3178 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3179 cm_free_msg(msg);
3180 if (ret)
3181 ib_destroy_cm_id(&cm_id_priv->id);
3182 return;
3183discard:
3184 spin_unlock_irq(&cm_id_priv->lock);
3185 cm_free_msg(msg);
3186}
3187
3188static void cm_send_handler(struct ib_mad_agent *mad_agent,
3189 struct ib_mad_send_wc *mad_send_wc)
3190{
3191 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3192 struct cm_port *port;
3193 u16 attr_index;
3194
3195 port = mad_agent->context;
3196 attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3197 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3198
3199 /*
3200 * If the send was in response to a received message (context[0] is not
3201 * set to a cm_id), and is not a REJ, then it is a send that was
3202 * manually retried.
3203 */
3204 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3205 msg->retries = 1;
3206
3207 atomic_long_add(1 + msg->retries,
3208 &port->counter_group[CM_XMIT].counter[attr_index]);
3209 if (msg->retries)
3210 atomic_long_add(msg->retries,
3211 &port->counter_group[CM_XMIT_RETRIES].
3212 counter[attr_index]);
3213
3214 switch (mad_send_wc->status) {
3215 case IB_WC_SUCCESS:
3216 case IB_WC_WR_FLUSH_ERR:
3217 cm_free_msg(msg);
3218 break;
3219 default:
3220 if (msg->context[0] && msg->context[1])
3221 cm_process_send_error(msg, mad_send_wc->status);
3222 else
3223 cm_free_msg(msg);
3224 break;
3225 }
3226}
3227
3228static void cm_work_handler(struct work_struct *_work)
3229{
3230 struct cm_work *work = container_of(_work, struct cm_work, work.work);
3231 int ret;
3232
3233 switch (work->cm_event.event) {
3234 case IB_CM_REQ_RECEIVED:
3235 ret = cm_req_handler(work);
3236 break;
3237 case IB_CM_MRA_RECEIVED:
3238 ret = cm_mra_handler(work);
3239 break;
3240 case IB_CM_REJ_RECEIVED:
3241 ret = cm_rej_handler(work);
3242 break;
3243 case IB_CM_REP_RECEIVED:
3244 ret = cm_rep_handler(work);
3245 break;
3246 case IB_CM_RTU_RECEIVED:
3247 ret = cm_rtu_handler(work);
3248 break;
3249 case IB_CM_USER_ESTABLISHED:
3250 ret = cm_establish_handler(work);
3251 break;
3252 case IB_CM_DREQ_RECEIVED:
3253 ret = cm_dreq_handler(work);
3254 break;
3255 case IB_CM_DREP_RECEIVED:
3256 ret = cm_drep_handler(work);
3257 break;
3258 case IB_CM_SIDR_REQ_RECEIVED:
3259 ret = cm_sidr_req_handler(work);
3260 break;
3261 case IB_CM_SIDR_REP_RECEIVED:
3262 ret = cm_sidr_rep_handler(work);
3263 break;
3264 case IB_CM_LAP_RECEIVED:
3265 ret = cm_lap_handler(work);
3266 break;
3267 case IB_CM_APR_RECEIVED:
3268 ret = cm_apr_handler(work);
3269 break;
3270 case IB_CM_TIMEWAIT_EXIT:
3271 ret = cm_timewait_handler(work);
3272 break;
3273 default:
3274 ret = -EINVAL;
3275 break;
3276 }
3277 if (ret)
3278 cm_free_work(work);
3279}
3280
3281static int cm_establish(struct ib_cm_id *cm_id)
3282{
3283 struct cm_id_private *cm_id_priv;
3284 struct cm_work *work;
3285 unsigned long flags;
3286 int ret = 0;
3287
3288 work = kmalloc(sizeof *work, GFP_ATOMIC);
3289 if (!work)
3290 return -ENOMEM;
3291
3292 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3293 spin_lock_irqsave(&cm_id_priv->lock, flags);
3294 switch (cm_id->state)
3295 {
3296 case IB_CM_REP_SENT:
3297 case IB_CM_MRA_REP_RCVD:
3298 cm_id->state = IB_CM_ESTABLISHED;
3299 break;
3300 case IB_CM_ESTABLISHED:
3301 ret = -EISCONN;
3302 break;
3303 default:
3304 ret = -EINVAL;
3305 break;
3306 }
3307 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3308
3309 if (ret) {
3310 kfree(work);
3311 goto out;
3312 }
3313
3314 /*
3315 * The CM worker thread may try to destroy the cm_id before it
3316 * can execute this work item. To prevent potential deadlock,
3317 * we need to find the cm_id once we're in the context of the
3318 * worker thread, rather than holding a reference on it.
3319 */
3320 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3321 work->local_id = cm_id->local_id;
3322 work->remote_id = cm_id->remote_id;
3323 work->mad_recv_wc = NULL;
3324 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3325 queue_delayed_work(cm.wq, &work->work, 0);
3326out:
3327 return ret;
3328}
3329
3330static int cm_migrate(struct ib_cm_id *cm_id)
3331{
3332 struct cm_id_private *cm_id_priv;
3333 unsigned long flags;
3334 int ret = 0;
3335
3336 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3337 spin_lock_irqsave(&cm_id_priv->lock, flags);
3338 if (cm_id->state == IB_CM_ESTABLISHED &&
3339 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3340 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3341 cm_id->lap_state = IB_CM_LAP_IDLE;
3342 cm_id_priv->av = cm_id_priv->alt_av;
3343 } else
3344 ret = -EINVAL;
3345 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3346
3347 return ret;
3348}
3349
3350int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3351{
3352 int ret;
3353
3354 switch (event) {
3355 case IB_EVENT_COMM_EST:
3356 ret = cm_establish(cm_id);
3357 break;
3358 case IB_EVENT_PATH_MIG:
3359 ret = cm_migrate(cm_id);
3360 break;
3361 default:
3362 ret = -EINVAL;
3363 }
3364 return ret;
3365}
3366EXPORT_SYMBOL(ib_cm_notify);
3367
3368static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3369 struct ib_mad_recv_wc *mad_recv_wc)
3370{
3371 struct cm_port *port = mad_agent->context;
3372 struct cm_work *work;
3373 enum ib_cm_event_type event;
3374 u16 attr_id;
3375 int paths = 0;
3376
3377 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3378 case CM_REQ_ATTR_ID:
3379 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3380 alt_local_lid != 0);
3381 event = IB_CM_REQ_RECEIVED;
3382 break;
3383 case CM_MRA_ATTR_ID:
3384 event = IB_CM_MRA_RECEIVED;
3385 break;
3386 case CM_REJ_ATTR_ID:
3387 event = IB_CM_REJ_RECEIVED;
3388 break;
3389 case CM_REP_ATTR_ID:
3390 event = IB_CM_REP_RECEIVED;
3391 break;
3392 case CM_RTU_ATTR_ID:
3393 event = IB_CM_RTU_RECEIVED;
3394 break;
3395 case CM_DREQ_ATTR_ID:
3396 event = IB_CM_DREQ_RECEIVED;
3397 break;
3398 case CM_DREP_ATTR_ID:
3399 event = IB_CM_DREP_RECEIVED;
3400 break;
3401 case CM_SIDR_REQ_ATTR_ID:
3402 event = IB_CM_SIDR_REQ_RECEIVED;
3403 break;
3404 case CM_SIDR_REP_ATTR_ID:
3405 event = IB_CM_SIDR_REP_RECEIVED;
3406 break;
3407 case CM_LAP_ATTR_ID:
3408 paths = 1;
3409 event = IB_CM_LAP_RECEIVED;
3410 break;
3411 case CM_APR_ATTR_ID:
3412 event = IB_CM_APR_RECEIVED;
3413 break;
3414 default:
3415 ib_free_recv_mad(mad_recv_wc);
3416 return;
3417 }
3418
3419 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
3420 atomic_long_inc(&port->counter_group[CM_RECV].
3421 counter[attr_id - CM_ATTR_ID_OFFSET]);
3422
3423 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3424 GFP_KERNEL);
3425 if (!work) {
3426 ib_free_recv_mad(mad_recv_wc);
3427 return;
3428 }
3429
3430 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3431 work->cm_event.event = event;
3432 work->mad_recv_wc = mad_recv_wc;
3433 work->port = port;
3434 queue_delayed_work(cm.wq, &work->work, 0);
3435}
3436
3437static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3438 struct ib_qp_attr *qp_attr,
3439 int *qp_attr_mask)
3440{
3441 unsigned long flags;
3442 int ret;
3443
3444 spin_lock_irqsave(&cm_id_priv->lock, flags);
3445 switch (cm_id_priv->id.state) {
3446 case IB_CM_REQ_SENT:
3447 case IB_CM_MRA_REQ_RCVD:
3448 case IB_CM_REQ_RCVD:
3449 case IB_CM_MRA_REQ_SENT:
3450 case IB_CM_REP_RCVD:
3451 case IB_CM_MRA_REP_SENT:
3452 case IB_CM_REP_SENT:
3453 case IB_CM_MRA_REP_RCVD:
3454 case IB_CM_ESTABLISHED:
3455 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3456 IB_QP_PKEY_INDEX | IB_QP_PORT;
3457 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
3458 if (cm_id_priv->responder_resources)
3459 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3460 IB_ACCESS_REMOTE_ATOMIC;
3461 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3462 qp_attr->port_num = cm_id_priv->av.port->port_num;
3463 ret = 0;
3464 break;
3465 default:
3466 ret = -EINVAL;
3467 break;
3468 }
3469 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3470 return ret;
3471}
3472
3473static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3474 struct ib_qp_attr *qp_attr,
3475 int *qp_attr_mask)
3476{
3477 unsigned long flags;
3478 int ret;
3479
3480 spin_lock_irqsave(&cm_id_priv->lock, flags);
3481 switch (cm_id_priv->id.state) {
3482 case IB_CM_REQ_RCVD:
3483 case IB_CM_MRA_REQ_SENT:
3484 case IB_CM_REP_RCVD:
3485 case IB_CM_MRA_REP_SENT:
3486 case IB_CM_REP_SENT:
3487 case IB_CM_MRA_REP_RCVD:
3488 case IB_CM_ESTABLISHED:
3489 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3490 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3491 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3492 qp_attr->path_mtu = cm_id_priv->path_mtu;
3493 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3494 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3495 if (cm_id_priv->qp_type == IB_QPT_RC) {
3496 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3497 IB_QP_MIN_RNR_TIMER;
3498 qp_attr->max_dest_rd_atomic =
3499 cm_id_priv->responder_resources;
3500 qp_attr->min_rnr_timer = 0;
3501 }
3502 if (cm_id_priv->alt_av.ah_attr.dlid) {
3503 *qp_attr_mask |= IB_QP_ALT_PATH;
3504 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3505 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3506 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3507 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3508 }
3509 ret = 0;
3510 break;
3511 default:
3512 ret = -EINVAL;
3513 break;
3514 }
3515 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3516 return ret;
3517}
3518
3519static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3520 struct ib_qp_attr *qp_attr,
3521 int *qp_attr_mask)
3522{
3523 unsigned long flags;
3524 int ret;
3525
3526 spin_lock_irqsave(&cm_id_priv->lock, flags);
3527 switch (cm_id_priv->id.state) {
3528 /* Allow transition to RTS before sending REP */
3529 case IB_CM_REQ_RCVD:
3530 case IB_CM_MRA_REQ_SENT:
3531
3532 case IB_CM_REP_RCVD:
3533 case IB_CM_MRA_REP_SENT:
3534 case IB_CM_REP_SENT:
3535 case IB_CM_MRA_REP_RCVD:
3536 case IB_CM_ESTABLISHED:
3537 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
3538 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3539 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3540 if (cm_id_priv->qp_type == IB_QPT_RC) {
3541 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3542 IB_QP_RNR_RETRY |
3543 IB_QP_MAX_QP_RD_ATOMIC;
3544 qp_attr->timeout = cm_id_priv->av.timeout;
3545 qp_attr->retry_cnt = cm_id_priv->retry_count;
3546 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3547 qp_attr->max_rd_atomic =
3548 cm_id_priv->initiator_depth;
3549 }
3550 if (cm_id_priv->alt_av.ah_attr.dlid) {
3551 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3552 qp_attr->path_mig_state = IB_MIG_REARM;
3553 }
3554 } else {
3555 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
3556 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3557 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3558 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3559 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3560 qp_attr->path_mig_state = IB_MIG_REARM;
3561 }
3562 ret = 0;
3563 break;
3564 default:
3565 ret = -EINVAL;
3566 break;
3567 }
3568 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3569 return ret;
3570}
3571
3572int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3573 struct ib_qp_attr *qp_attr,
3574 int *qp_attr_mask)
3575{
3576 struct cm_id_private *cm_id_priv;
3577 int ret;
3578
3579 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3580 switch (qp_attr->qp_state) {
3581 case IB_QPS_INIT:
3582 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3583 break;
3584 case IB_QPS_RTR:
3585 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3586 break;
3587 case IB_QPS_RTS:
3588 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3589 break;
3590 default:
3591 ret = -EINVAL;
3592 break;
3593 }
3594 return ret;
3595}
3596EXPORT_SYMBOL(ib_cm_init_qp_attr);
3597
3598static void cm_get_ack_delay(struct cm_device *cm_dev)
3599{
3600 struct ib_device_attr attr;
3601
3602 if (ib_query_device(cm_dev->ib_device, &attr))
3603 cm_dev->ack_delay = 0; /* acks will rely on packet life time */
3604 else
3605 cm_dev->ack_delay = attr.local_ca_ack_delay;
3606}
3607
3608static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
3609 char *buf)
3610{
3611 struct cm_counter_group *group;
3612 struct cm_counter_attribute *cm_attr;
3613
3614 group = container_of(obj, struct cm_counter_group, obj);
3615 cm_attr = container_of(attr, struct cm_counter_attribute, attr);
3616
3617 return sprintf(buf, "%ld\n",
3618 atomic_long_read(&group->counter[cm_attr->index]));
3619}
3620
3621static const struct sysfs_ops cm_counter_ops = {
3622 .show = cm_show_counter
3623};
3624
3625static struct kobj_type cm_counter_obj_type = {
3626 .sysfs_ops = &cm_counter_ops,
3627 .default_attrs = cm_counter_default_attrs
3628};
3629
3630static void cm_release_port_obj(struct kobject *obj)
3631{
3632 struct cm_port *cm_port;
3633
3634 cm_port = container_of(obj, struct cm_port, port_obj);
3635 kfree(cm_port);
3636}
3637
3638static struct kobj_type cm_port_obj_type = {
3639 .release = cm_release_port_obj
3640};
3641
3642static char *cm_devnode(struct device *dev, mode_t *mode)
3643{
3644 if (mode)
3645 *mode = 0666;
3646 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
3647}
3648
3649struct class cm_class = {
3650 .owner = THIS_MODULE,
3651 .name = "infiniband_cm",
3652 .devnode = cm_devnode,
3653};
3654EXPORT_SYMBOL(cm_class);
3655
3656static int cm_create_port_fs(struct cm_port *port)
3657{
3658 int i, ret;
3659
3660 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type,
3661 &port->cm_dev->device->kobj,
3662 "%d", port->port_num);
3663 if (ret) {
3664 kfree(port);
3665 return ret;
3666 }
3667
3668 for (i = 0; i < CM_COUNTER_GROUPS; i++) {
3669 ret = kobject_init_and_add(&port->counter_group[i].obj,
3670 &cm_counter_obj_type,
3671 &port->port_obj,
3672 "%s", counter_group_names[i]);
3673 if (ret)
3674 goto error;
3675 }
3676
3677 return 0;
3678
3679error:
3680 while (i--)
3681 kobject_put(&port->counter_group[i].obj);
3682 kobject_put(&port->port_obj);
3683 return ret;
3684
3685}
3686
3687static void cm_remove_port_fs(struct cm_port *port)
3688{
3689 int i;
3690
3691 for (i = 0; i < CM_COUNTER_GROUPS; i++)
3692 kobject_put(&port->counter_group[i].obj);
3693
3694 kobject_put(&port->port_obj);
3695}
3696
3697static void cm_add_one(struct ib_device *ib_device)
3698{
3699 struct cm_device *cm_dev;
3700 struct cm_port *port;
3701 struct ib_mad_reg_req reg_req = {
3702 .mgmt_class = IB_MGMT_CLASS_CM,
3703 .mgmt_class_version = IB_CM_CLASS_VERSION
3704 };
3705 struct ib_port_modify port_modify = {
3706 .set_port_cap_mask = IB_PORT_CM_SUP
3707 };
3708 unsigned long flags;
3709 int ret;
3710 u8 i;
3711
3712 if (rdma_node_get_transport(ib_device->node_type) != RDMA_TRANSPORT_IB)
3713 return;
3714
3715 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) *
3716 ib_device->phys_port_cnt, GFP_KERNEL);
3717 if (!cm_dev)
3718 return;
3719
3720 cm_dev->ib_device = ib_device;
3721 cm_get_ack_delay(cm_dev);
3722
3723 cm_dev->device = device_create(&cm_class, &ib_device->dev,
3724 MKDEV(0, 0), NULL,
3725 "%s", ib_device->name);
3726 if (IS_ERR(cm_dev->device)) {
3727 kfree(cm_dev);
3728 return;
3729 }
3730
3731 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3732 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3733 port = kzalloc(sizeof *port, GFP_KERNEL);
3734 if (!port)
3735 goto error1;
3736
3737 cm_dev->port[i-1] = port;
3738 port->cm_dev = cm_dev;
3739 port->port_num = i;
3740
3741 ret = cm_create_port_fs(port);
3742 if (ret)
3743 goto error1;
3744
3745 port->mad_agent = ib_register_mad_agent(ib_device, i,
3746 IB_QPT_GSI,
3747 ®_req,
3748 0,
3749 cm_send_handler,
3750 cm_recv_handler,
3751 port);
3752 if (IS_ERR(port->mad_agent))
3753 goto error2;
3754
3755 ret = ib_modify_port(ib_device, i, 0, &port_modify);
3756 if (ret)
3757 goto error3;
3758 }
3759 ib_set_client_data(ib_device, &cm_client, cm_dev);
3760
3761 write_lock_irqsave(&cm.device_lock, flags);
3762 list_add_tail(&cm_dev->list, &cm.device_list);
3763 write_unlock_irqrestore(&cm.device_lock, flags);
3764 return;
3765
3766error3:
3767 ib_unregister_mad_agent(port->mad_agent);
3768error2:
3769 cm_remove_port_fs(port);
3770error1:
3771 port_modify.set_port_cap_mask = 0;
3772 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3773 while (--i) {
3774 port = cm_dev->port[i-1];
3775 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3776 ib_unregister_mad_agent(port->mad_agent);
3777 cm_remove_port_fs(port);
3778 }
3779 device_unregister(cm_dev->device);
3780 kfree(cm_dev);
3781}
3782
3783static void cm_remove_one(struct ib_device *ib_device)
3784{
3785 struct cm_device *cm_dev;
3786 struct cm_port *port;
3787 struct ib_port_modify port_modify = {
3788 .clr_port_cap_mask = IB_PORT_CM_SUP
3789 };
3790 unsigned long flags;
3791 int i;
3792
3793 cm_dev = ib_get_client_data(ib_device, &cm_client);
3794 if (!cm_dev)
3795 return;
3796
3797 write_lock_irqsave(&cm.device_lock, flags);
3798 list_del(&cm_dev->list);
3799 write_unlock_irqrestore(&cm.device_lock, flags);
3800
3801 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3802 port = cm_dev->port[i-1];
3803 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3804 ib_unregister_mad_agent(port->mad_agent);
3805 flush_workqueue(cm.wq);
3806 cm_remove_port_fs(port);
3807 }
3808 device_unregister(cm_dev->device);
3809 kfree(cm_dev);
3810}
3811
3812static int __init ib_cm_init(void)
3813{
3814 int ret;
3815
3816 memset(&cm, 0, sizeof cm);
3817 INIT_LIST_HEAD(&cm.device_list);
3818 rwlock_init(&cm.device_lock);
3819 spin_lock_init(&cm.lock);
3820 cm.listen_service_table = RB_ROOT;
3821 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3822 cm.remote_id_table = RB_ROOT;
3823 cm.remote_qp_table = RB_ROOT;
3824 cm.remote_sidr_table = RB_ROOT;
3825 idr_init(&cm.local_id_table);
3826 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3827 idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3828 INIT_LIST_HEAD(&cm.timewait_list);
3829
3830 ret = class_register(&cm_class);
3831 if (ret)
3832 return -ENOMEM;
3833
3834 cm.wq = create_workqueue("ib_cm");
3835 if (!cm.wq) {
3836 ret = -ENOMEM;
3837 goto error1;
3838 }
3839
3840 ret = ib_register_client(&cm_client);
3841 if (ret)
3842 goto error2;
3843
3844 return 0;
3845error2:
3846 destroy_workqueue(cm.wq);
3847error1:
3848 class_unregister(&cm_class);
3849 return ret;
3850}
3851
3852static void __exit ib_cm_cleanup(void)
3853{
3854 struct cm_timewait_info *timewait_info, *tmp;
3855
3856 spin_lock_irq(&cm.lock);
3857 list_for_each_entry(timewait_info, &cm.timewait_list, list)
3858 cancel_delayed_work(&timewait_info->work.work);
3859 spin_unlock_irq(&cm.lock);
3860
3861 ib_unregister_client(&cm_client);
3862 destroy_workqueue(cm.wq);
3863
3864 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
3865 list_del(&timewait_info->list);
3866 kfree(timewait_info);
3867 }
3868
3869 class_unregister(&cm_class);
3870 idr_destroy(&cm.local_id_table);
3871}
3872
3873module_init(ib_cm_init);
3874module_exit(ib_cm_cleanup);
3875
1/*
2 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved.
3 * Copyright (c) 2004 Topspin Corporation. All rights reserved.
4 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved.
5 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 */
35
36#include <linux/completion.h>
37#include <linux/dma-mapping.h>
38#include <linux/device.h>
39#include <linux/module.h>
40#include <linux/err.h>
41#include <linux/idr.h>
42#include <linux/interrupt.h>
43#include <linux/random.h>
44#include <linux/rbtree.h>
45#include <linux/spinlock.h>
46#include <linux/slab.h>
47#include <linux/sysfs.h>
48#include <linux/workqueue.h>
49#include <linux/kdev_t.h>
50#include <linux/etherdevice.h>
51
52#include <rdma/ib_cache.h>
53#include <rdma/ib_cm.h>
54#include "cm_msgs.h"
55
56MODULE_AUTHOR("Sean Hefty");
57MODULE_DESCRIPTION("InfiniBand CM");
58MODULE_LICENSE("Dual BSD/GPL");
59
60static const char * const ibcm_rej_reason_strs[] = {
61 [IB_CM_REJ_NO_QP] = "no QP",
62 [IB_CM_REJ_NO_EEC] = "no EEC",
63 [IB_CM_REJ_NO_RESOURCES] = "no resources",
64 [IB_CM_REJ_TIMEOUT] = "timeout",
65 [IB_CM_REJ_UNSUPPORTED] = "unsupported",
66 [IB_CM_REJ_INVALID_COMM_ID] = "invalid comm ID",
67 [IB_CM_REJ_INVALID_COMM_INSTANCE] = "invalid comm instance",
68 [IB_CM_REJ_INVALID_SERVICE_ID] = "invalid service ID",
69 [IB_CM_REJ_INVALID_TRANSPORT_TYPE] = "invalid transport type",
70 [IB_CM_REJ_STALE_CONN] = "stale conn",
71 [IB_CM_REJ_RDC_NOT_EXIST] = "RDC not exist",
72 [IB_CM_REJ_INVALID_GID] = "invalid GID",
73 [IB_CM_REJ_INVALID_LID] = "invalid LID",
74 [IB_CM_REJ_INVALID_SL] = "invalid SL",
75 [IB_CM_REJ_INVALID_TRAFFIC_CLASS] = "invalid traffic class",
76 [IB_CM_REJ_INVALID_HOP_LIMIT] = "invalid hop limit",
77 [IB_CM_REJ_INVALID_PACKET_RATE] = "invalid packet rate",
78 [IB_CM_REJ_INVALID_ALT_GID] = "invalid alt GID",
79 [IB_CM_REJ_INVALID_ALT_LID] = "invalid alt LID",
80 [IB_CM_REJ_INVALID_ALT_SL] = "invalid alt SL",
81 [IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS] = "invalid alt traffic class",
82 [IB_CM_REJ_INVALID_ALT_HOP_LIMIT] = "invalid alt hop limit",
83 [IB_CM_REJ_INVALID_ALT_PACKET_RATE] = "invalid alt packet rate",
84 [IB_CM_REJ_PORT_CM_REDIRECT] = "port CM redirect",
85 [IB_CM_REJ_PORT_REDIRECT] = "port redirect",
86 [IB_CM_REJ_INVALID_MTU] = "invalid MTU",
87 [IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES] = "insufficient resp resources",
88 [IB_CM_REJ_CONSUMER_DEFINED] = "consumer defined",
89 [IB_CM_REJ_INVALID_RNR_RETRY] = "invalid RNR retry",
90 [IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID] = "duplicate local comm ID",
91 [IB_CM_REJ_INVALID_CLASS_VERSION] = "invalid class version",
92 [IB_CM_REJ_INVALID_FLOW_LABEL] = "invalid flow label",
93 [IB_CM_REJ_INVALID_ALT_FLOW_LABEL] = "invalid alt flow label",
94};
95
96const char *__attribute_const__ ibcm_reject_msg(int reason)
97{
98 size_t index = reason;
99
100 if (index < ARRAY_SIZE(ibcm_rej_reason_strs) &&
101 ibcm_rej_reason_strs[index])
102 return ibcm_rej_reason_strs[index];
103 else
104 return "unrecognized reason";
105}
106EXPORT_SYMBOL(ibcm_reject_msg);
107
108static void cm_add_one(struct ib_device *device);
109static void cm_remove_one(struct ib_device *device, void *client_data);
110
111static struct ib_client cm_client = {
112 .name = "cm",
113 .add = cm_add_one,
114 .remove = cm_remove_one
115};
116
117static struct ib_cm {
118 spinlock_t lock;
119 struct list_head device_list;
120 rwlock_t device_lock;
121 struct rb_root listen_service_table;
122 u64 listen_service_id;
123 /* struct rb_root peer_service_table; todo: fix peer to peer */
124 struct rb_root remote_qp_table;
125 struct rb_root remote_id_table;
126 struct rb_root remote_sidr_table;
127 struct idr local_id_table;
128 __be32 random_id_operand;
129 struct list_head timewait_list;
130 struct workqueue_struct *wq;
131 /* Sync on cm change port state */
132 spinlock_t state_lock;
133} cm;
134
135/* Counter indexes ordered by attribute ID */
136enum {
137 CM_REQ_COUNTER,
138 CM_MRA_COUNTER,
139 CM_REJ_COUNTER,
140 CM_REP_COUNTER,
141 CM_RTU_COUNTER,
142 CM_DREQ_COUNTER,
143 CM_DREP_COUNTER,
144 CM_SIDR_REQ_COUNTER,
145 CM_SIDR_REP_COUNTER,
146 CM_LAP_COUNTER,
147 CM_APR_COUNTER,
148 CM_ATTR_COUNT,
149 CM_ATTR_ID_OFFSET = 0x0010,
150};
151
152enum {
153 CM_XMIT,
154 CM_XMIT_RETRIES,
155 CM_RECV,
156 CM_RECV_DUPLICATES,
157 CM_COUNTER_GROUPS
158};
159
160static char const counter_group_names[CM_COUNTER_GROUPS]
161 [sizeof("cm_rx_duplicates")] = {
162 "cm_tx_msgs", "cm_tx_retries",
163 "cm_rx_msgs", "cm_rx_duplicates"
164};
165
166struct cm_counter_group {
167 struct kobject obj;
168 atomic_long_t counter[CM_ATTR_COUNT];
169};
170
171struct cm_counter_attribute {
172 struct attribute attr;
173 int index;
174};
175
176#define CM_COUNTER_ATTR(_name, _index) \
177struct cm_counter_attribute cm_##_name##_counter_attr = { \
178 .attr = { .name = __stringify(_name), .mode = 0444 }, \
179 .index = _index \
180}
181
182static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
183static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
184static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
185static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
186static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
187static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
188static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
189static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
190static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
191static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
192static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
193
194static struct attribute *cm_counter_default_attrs[] = {
195 &cm_req_counter_attr.attr,
196 &cm_mra_counter_attr.attr,
197 &cm_rej_counter_attr.attr,
198 &cm_rep_counter_attr.attr,
199 &cm_rtu_counter_attr.attr,
200 &cm_dreq_counter_attr.attr,
201 &cm_drep_counter_attr.attr,
202 &cm_sidr_req_counter_attr.attr,
203 &cm_sidr_rep_counter_attr.attr,
204 &cm_lap_counter_attr.attr,
205 &cm_apr_counter_attr.attr,
206 NULL
207};
208
209struct cm_port {
210 struct cm_device *cm_dev;
211 struct ib_mad_agent *mad_agent;
212 struct kobject port_obj;
213 u8 port_num;
214 struct list_head cm_priv_prim_list;
215 struct list_head cm_priv_altr_list;
216 struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
217};
218
219struct cm_device {
220 struct list_head list;
221 struct ib_device *ib_device;
222 struct device *device;
223 u8 ack_delay;
224 int going_down;
225 struct cm_port *port[0];
226};
227
228struct cm_av {
229 struct cm_port *port;
230 union ib_gid dgid;
231 struct rdma_ah_attr ah_attr;
232 u16 pkey_index;
233 u8 timeout;
234};
235
236struct cm_work {
237 struct delayed_work work;
238 struct list_head list;
239 struct cm_port *port;
240 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
241 __be32 local_id; /* Established / timewait */
242 __be32 remote_id;
243 struct ib_cm_event cm_event;
244 struct sa_path_rec path[0];
245};
246
247struct cm_timewait_info {
248 struct cm_work work; /* Must be first. */
249 struct list_head list;
250 struct rb_node remote_qp_node;
251 struct rb_node remote_id_node;
252 __be64 remote_ca_guid;
253 __be32 remote_qpn;
254 u8 inserted_remote_qp;
255 u8 inserted_remote_id;
256};
257
258struct cm_id_private {
259 struct ib_cm_id id;
260
261 struct rb_node service_node;
262 struct rb_node sidr_id_node;
263 spinlock_t lock; /* Do not acquire inside cm.lock */
264 struct completion comp;
265 atomic_t refcount;
266 /* Number of clients sharing this ib_cm_id. Only valid for listeners.
267 * Protected by the cm.lock spinlock. */
268 int listen_sharecount;
269
270 struct ib_mad_send_buf *msg;
271 struct cm_timewait_info *timewait_info;
272 /* todo: use alternate port on send failure */
273 struct cm_av av;
274 struct cm_av alt_av;
275
276 void *private_data;
277 __be64 tid;
278 __be32 local_qpn;
279 __be32 remote_qpn;
280 enum ib_qp_type qp_type;
281 __be32 sq_psn;
282 __be32 rq_psn;
283 int timeout_ms;
284 enum ib_mtu path_mtu;
285 __be16 pkey;
286 u8 private_data_len;
287 u8 max_cm_retries;
288 u8 peer_to_peer;
289 u8 responder_resources;
290 u8 initiator_depth;
291 u8 retry_count;
292 u8 rnr_retry_count;
293 u8 service_timeout;
294 u8 target_ack_delay;
295
296 struct list_head prim_list;
297 struct list_head altr_list;
298 /* Indicates that the send port mad is registered and av is set */
299 int prim_send_port_not_ready;
300 int altr_send_port_not_ready;
301
302 struct list_head work_list;
303 atomic_t work_count;
304};
305
306static void cm_work_handler(struct work_struct *work);
307
308static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
309{
310 if (atomic_dec_and_test(&cm_id_priv->refcount))
311 complete(&cm_id_priv->comp);
312}
313
314static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
315 struct ib_mad_send_buf **msg)
316{
317 struct ib_mad_agent *mad_agent;
318 struct ib_mad_send_buf *m;
319 struct ib_ah *ah;
320 struct cm_av *av;
321 unsigned long flags, flags2;
322 int ret = 0;
323
324 /* don't let the port to be released till the agent is down */
325 spin_lock_irqsave(&cm.state_lock, flags2);
326 spin_lock_irqsave(&cm.lock, flags);
327 if (!cm_id_priv->prim_send_port_not_ready)
328 av = &cm_id_priv->av;
329 else if (!cm_id_priv->altr_send_port_not_ready &&
330 (cm_id_priv->alt_av.port))
331 av = &cm_id_priv->alt_av;
332 else {
333 pr_info("%s: not valid CM id\n", __func__);
334 ret = -ENODEV;
335 spin_unlock_irqrestore(&cm.lock, flags);
336 goto out;
337 }
338 spin_unlock_irqrestore(&cm.lock, flags);
339 /* Make sure the port haven't released the mad yet */
340 mad_agent = cm_id_priv->av.port->mad_agent;
341 if (!mad_agent) {
342 pr_info("%s: not a valid MAD agent\n", __func__);
343 ret = -ENODEV;
344 goto out;
345 }
346 ah = rdma_create_ah(mad_agent->qp->pd, &av->ah_attr);
347 if (IS_ERR(ah)) {
348 ret = PTR_ERR(ah);
349 goto out;
350 }
351
352 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
353 av->pkey_index,
354 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
355 GFP_ATOMIC,
356 IB_MGMT_BASE_VERSION);
357 if (IS_ERR(m)) {
358 rdma_destroy_ah(ah);
359 ret = PTR_ERR(m);
360 goto out;
361 }
362
363 /* Timeout set by caller if response is expected. */
364 m->ah = ah;
365 m->retries = cm_id_priv->max_cm_retries;
366
367 atomic_inc(&cm_id_priv->refcount);
368 m->context[0] = cm_id_priv;
369 *msg = m;
370
371out:
372 spin_unlock_irqrestore(&cm.state_lock, flags2);
373 return ret;
374}
375
376static struct ib_mad_send_buf *cm_alloc_response_msg_no_ah(struct cm_port *port,
377 struct ib_mad_recv_wc *mad_recv_wc)
378{
379 return ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
380 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
381 GFP_ATOMIC,
382 IB_MGMT_BASE_VERSION);
383}
384
385static int cm_create_response_msg_ah(struct cm_port *port,
386 struct ib_mad_recv_wc *mad_recv_wc,
387 struct ib_mad_send_buf *msg)
388{
389 struct ib_ah *ah;
390
391 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
392 mad_recv_wc->recv_buf.grh, port->port_num);
393 if (IS_ERR(ah))
394 return PTR_ERR(ah);
395
396 msg->ah = ah;
397 return 0;
398}
399
400static void cm_free_msg(struct ib_mad_send_buf *msg)
401{
402 if (msg->ah)
403 rdma_destroy_ah(msg->ah);
404 if (msg->context[0])
405 cm_deref_id(msg->context[0]);
406 ib_free_send_mad(msg);
407}
408
409static int cm_alloc_response_msg(struct cm_port *port,
410 struct ib_mad_recv_wc *mad_recv_wc,
411 struct ib_mad_send_buf **msg)
412{
413 struct ib_mad_send_buf *m;
414 int ret;
415
416 m = cm_alloc_response_msg_no_ah(port, mad_recv_wc);
417 if (IS_ERR(m))
418 return PTR_ERR(m);
419
420 ret = cm_create_response_msg_ah(port, mad_recv_wc, m);
421 if (ret) {
422 cm_free_msg(m);
423 return ret;
424 }
425
426 *msg = m;
427 return 0;
428}
429
430static void * cm_copy_private_data(const void *private_data,
431 u8 private_data_len)
432{
433 void *data;
434
435 if (!private_data || !private_data_len)
436 return NULL;
437
438 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
439 if (!data)
440 return ERR_PTR(-ENOMEM);
441
442 return data;
443}
444
445static void cm_set_private_data(struct cm_id_private *cm_id_priv,
446 void *private_data, u8 private_data_len)
447{
448 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
449 kfree(cm_id_priv->private_data);
450
451 cm_id_priv->private_data = private_data;
452 cm_id_priv->private_data_len = private_data_len;
453}
454
455static int cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
456 struct ib_grh *grh, struct cm_av *av)
457{
458 av->port = port;
459 av->pkey_index = wc->pkey_index;
460 return ib_init_ah_attr_from_wc(port->cm_dev->ib_device,
461 port->port_num, wc,
462 grh, &av->ah_attr);
463}
464
465static int add_cm_id_to_port_list(struct cm_id_private *cm_id_priv,
466 struct cm_av *av,
467 struct cm_port *port)
468{
469 unsigned long flags;
470 int ret = 0;
471
472 spin_lock_irqsave(&cm.lock, flags);
473
474 if (&cm_id_priv->av == av)
475 list_add_tail(&cm_id_priv->prim_list, &port->cm_priv_prim_list);
476 else if (&cm_id_priv->alt_av == av)
477 list_add_tail(&cm_id_priv->altr_list, &port->cm_priv_altr_list);
478 else
479 ret = -EINVAL;
480
481 spin_unlock_irqrestore(&cm.lock, flags);
482 return ret;
483}
484
485static struct cm_port *get_cm_port_from_path(struct sa_path_rec *path)
486{
487 struct cm_device *cm_dev;
488 struct cm_port *port = NULL;
489 unsigned long flags;
490 u8 p;
491 struct net_device *ndev = ib_get_ndev_from_path(path);
492
493 read_lock_irqsave(&cm.device_lock, flags);
494 list_for_each_entry(cm_dev, &cm.device_list, list) {
495 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid,
496 sa_conv_pathrec_to_gid_type(path),
497 ndev, &p, NULL)) {
498 port = cm_dev->port[p - 1];
499 break;
500 }
501 }
502 read_unlock_irqrestore(&cm.device_lock, flags);
503
504 if (ndev)
505 dev_put(ndev);
506 return port;
507}
508
509static int cm_init_av_by_path(struct sa_path_rec *path, struct cm_av *av,
510 struct cm_id_private *cm_id_priv)
511{
512 struct cm_device *cm_dev;
513 struct cm_port *port;
514 int ret;
515
516 port = get_cm_port_from_path(path);
517 if (!port)
518 return -EINVAL;
519 cm_dev = port->cm_dev;
520
521 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
522 be16_to_cpu(path->pkey), &av->pkey_index);
523 if (ret)
524 return ret;
525
526 av->port = port;
527 ret = ib_init_ah_attr_from_path(cm_dev->ib_device, port->port_num, path,
528 &av->ah_attr);
529 if (ret)
530 return ret;
531
532 av->timeout = path->packet_life_time + 1;
533
534 ret = add_cm_id_to_port_list(cm_id_priv, av, port);
535 return ret;
536}
537
538static int cm_alloc_id(struct cm_id_private *cm_id_priv)
539{
540 unsigned long flags;
541 int id;
542
543 idr_preload(GFP_KERNEL);
544 spin_lock_irqsave(&cm.lock, flags);
545
546 id = idr_alloc_cyclic(&cm.local_id_table, cm_id_priv, 0, 0, GFP_NOWAIT);
547
548 spin_unlock_irqrestore(&cm.lock, flags);
549 idr_preload_end();
550
551 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
552 return id < 0 ? id : 0;
553}
554
555static void cm_free_id(__be32 local_id)
556{
557 spin_lock_irq(&cm.lock);
558 idr_remove(&cm.local_id_table,
559 (__force int) (local_id ^ cm.random_id_operand));
560 spin_unlock_irq(&cm.lock);
561}
562
563static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
564{
565 struct cm_id_private *cm_id_priv;
566
567 cm_id_priv = idr_find(&cm.local_id_table,
568 (__force int) (local_id ^ cm.random_id_operand));
569 if (cm_id_priv) {
570 if (cm_id_priv->id.remote_id == remote_id)
571 atomic_inc(&cm_id_priv->refcount);
572 else
573 cm_id_priv = NULL;
574 }
575
576 return cm_id_priv;
577}
578
579static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
580{
581 struct cm_id_private *cm_id_priv;
582
583 spin_lock_irq(&cm.lock);
584 cm_id_priv = cm_get_id(local_id, remote_id);
585 spin_unlock_irq(&cm.lock);
586
587 return cm_id_priv;
588}
589
590/*
591 * Trivial helpers to strip endian annotation and compare; the
592 * endianness doesn't actually matter since we just need a stable
593 * order for the RB tree.
594 */
595static int be32_lt(__be32 a, __be32 b)
596{
597 return (__force u32) a < (__force u32) b;
598}
599
600static int be32_gt(__be32 a, __be32 b)
601{
602 return (__force u32) a > (__force u32) b;
603}
604
605static int be64_lt(__be64 a, __be64 b)
606{
607 return (__force u64) a < (__force u64) b;
608}
609
610static int be64_gt(__be64 a, __be64 b)
611{
612 return (__force u64) a > (__force u64) b;
613}
614
615static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
616{
617 struct rb_node **link = &cm.listen_service_table.rb_node;
618 struct rb_node *parent = NULL;
619 struct cm_id_private *cur_cm_id_priv;
620 __be64 service_id = cm_id_priv->id.service_id;
621 __be64 service_mask = cm_id_priv->id.service_mask;
622
623 while (*link) {
624 parent = *link;
625 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
626 service_node);
627 if ((cur_cm_id_priv->id.service_mask & service_id) ==
628 (service_mask & cur_cm_id_priv->id.service_id) &&
629 (cm_id_priv->id.device == cur_cm_id_priv->id.device))
630 return cur_cm_id_priv;
631
632 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
633 link = &(*link)->rb_left;
634 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
635 link = &(*link)->rb_right;
636 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
637 link = &(*link)->rb_left;
638 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
639 link = &(*link)->rb_right;
640 else
641 link = &(*link)->rb_right;
642 }
643 rb_link_node(&cm_id_priv->service_node, parent, link);
644 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
645 return NULL;
646}
647
648static struct cm_id_private * cm_find_listen(struct ib_device *device,
649 __be64 service_id)
650{
651 struct rb_node *node = cm.listen_service_table.rb_node;
652 struct cm_id_private *cm_id_priv;
653
654 while (node) {
655 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
656 if ((cm_id_priv->id.service_mask & service_id) ==
657 cm_id_priv->id.service_id &&
658 (cm_id_priv->id.device == device))
659 return cm_id_priv;
660
661 if (device < cm_id_priv->id.device)
662 node = node->rb_left;
663 else if (device > cm_id_priv->id.device)
664 node = node->rb_right;
665 else if (be64_lt(service_id, cm_id_priv->id.service_id))
666 node = node->rb_left;
667 else if (be64_gt(service_id, cm_id_priv->id.service_id))
668 node = node->rb_right;
669 else
670 node = node->rb_right;
671 }
672 return NULL;
673}
674
675static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
676 *timewait_info)
677{
678 struct rb_node **link = &cm.remote_id_table.rb_node;
679 struct rb_node *parent = NULL;
680 struct cm_timewait_info *cur_timewait_info;
681 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
682 __be32 remote_id = timewait_info->work.remote_id;
683
684 while (*link) {
685 parent = *link;
686 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
687 remote_id_node);
688 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
689 link = &(*link)->rb_left;
690 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
691 link = &(*link)->rb_right;
692 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
693 link = &(*link)->rb_left;
694 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
695 link = &(*link)->rb_right;
696 else
697 return cur_timewait_info;
698 }
699 timewait_info->inserted_remote_id = 1;
700 rb_link_node(&timewait_info->remote_id_node, parent, link);
701 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
702 return NULL;
703}
704
705static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
706 __be32 remote_id)
707{
708 struct rb_node *node = cm.remote_id_table.rb_node;
709 struct cm_timewait_info *timewait_info;
710
711 while (node) {
712 timewait_info = rb_entry(node, struct cm_timewait_info,
713 remote_id_node);
714 if (be32_lt(remote_id, timewait_info->work.remote_id))
715 node = node->rb_left;
716 else if (be32_gt(remote_id, timewait_info->work.remote_id))
717 node = node->rb_right;
718 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
719 node = node->rb_left;
720 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
721 node = node->rb_right;
722 else
723 return timewait_info;
724 }
725 return NULL;
726}
727
728static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
729 *timewait_info)
730{
731 struct rb_node **link = &cm.remote_qp_table.rb_node;
732 struct rb_node *parent = NULL;
733 struct cm_timewait_info *cur_timewait_info;
734 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
735 __be32 remote_qpn = timewait_info->remote_qpn;
736
737 while (*link) {
738 parent = *link;
739 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
740 remote_qp_node);
741 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
742 link = &(*link)->rb_left;
743 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
744 link = &(*link)->rb_right;
745 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
746 link = &(*link)->rb_left;
747 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
748 link = &(*link)->rb_right;
749 else
750 return cur_timewait_info;
751 }
752 timewait_info->inserted_remote_qp = 1;
753 rb_link_node(&timewait_info->remote_qp_node, parent, link);
754 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
755 return NULL;
756}
757
758static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
759 *cm_id_priv)
760{
761 struct rb_node **link = &cm.remote_sidr_table.rb_node;
762 struct rb_node *parent = NULL;
763 struct cm_id_private *cur_cm_id_priv;
764 union ib_gid *port_gid = &cm_id_priv->av.dgid;
765 __be32 remote_id = cm_id_priv->id.remote_id;
766
767 while (*link) {
768 parent = *link;
769 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
770 sidr_id_node);
771 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
772 link = &(*link)->rb_left;
773 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
774 link = &(*link)->rb_right;
775 else {
776 int cmp;
777 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
778 sizeof *port_gid);
779 if (cmp < 0)
780 link = &(*link)->rb_left;
781 else if (cmp > 0)
782 link = &(*link)->rb_right;
783 else
784 return cur_cm_id_priv;
785 }
786 }
787 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
788 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
789 return NULL;
790}
791
792static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
793 enum ib_cm_sidr_status status)
794{
795 struct ib_cm_sidr_rep_param param;
796
797 memset(¶m, 0, sizeof param);
798 param.status = status;
799 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m);
800}
801
802struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
803 ib_cm_handler cm_handler,
804 void *context)
805{
806 struct cm_id_private *cm_id_priv;
807 int ret;
808
809 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
810 if (!cm_id_priv)
811 return ERR_PTR(-ENOMEM);
812
813 cm_id_priv->id.state = IB_CM_IDLE;
814 cm_id_priv->id.device = device;
815 cm_id_priv->id.cm_handler = cm_handler;
816 cm_id_priv->id.context = context;
817 cm_id_priv->id.remote_cm_qpn = 1;
818 ret = cm_alloc_id(cm_id_priv);
819 if (ret)
820 goto error;
821
822 spin_lock_init(&cm_id_priv->lock);
823 init_completion(&cm_id_priv->comp);
824 INIT_LIST_HEAD(&cm_id_priv->work_list);
825 INIT_LIST_HEAD(&cm_id_priv->prim_list);
826 INIT_LIST_HEAD(&cm_id_priv->altr_list);
827 atomic_set(&cm_id_priv->work_count, -1);
828 atomic_set(&cm_id_priv->refcount, 1);
829 return &cm_id_priv->id;
830
831error:
832 kfree(cm_id_priv);
833 return ERR_PTR(-ENOMEM);
834}
835EXPORT_SYMBOL(ib_create_cm_id);
836
837static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
838{
839 struct cm_work *work;
840
841 if (list_empty(&cm_id_priv->work_list))
842 return NULL;
843
844 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
845 list_del(&work->list);
846 return work;
847}
848
849static void cm_free_work(struct cm_work *work)
850{
851 if (work->mad_recv_wc)
852 ib_free_recv_mad(work->mad_recv_wc);
853 kfree(work);
854}
855
856static inline int cm_convert_to_ms(int iba_time)
857{
858 /* approximate conversion to ms from 4.096us x 2^iba_time */
859 return 1 << max(iba_time - 8, 0);
860}
861
862/*
863 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
864 * Because of how ack_timeout is stored, adding one doubles the timeout.
865 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
866 * increment it (round up) only if the other is within 50%.
867 */
868static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
869{
870 int ack_timeout = packet_life_time + 1;
871
872 if (ack_timeout >= ca_ack_delay)
873 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
874 else
875 ack_timeout = ca_ack_delay +
876 (ack_timeout >= (ca_ack_delay - 1));
877
878 return min(31, ack_timeout);
879}
880
881static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
882{
883 if (timewait_info->inserted_remote_id) {
884 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
885 timewait_info->inserted_remote_id = 0;
886 }
887
888 if (timewait_info->inserted_remote_qp) {
889 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
890 timewait_info->inserted_remote_qp = 0;
891 }
892}
893
894static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
895{
896 struct cm_timewait_info *timewait_info;
897
898 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
899 if (!timewait_info)
900 return ERR_PTR(-ENOMEM);
901
902 timewait_info->work.local_id = local_id;
903 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
904 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
905 return timewait_info;
906}
907
908static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
909{
910 int wait_time;
911 unsigned long flags;
912 struct cm_device *cm_dev;
913
914 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client);
915 if (!cm_dev)
916 return;
917
918 spin_lock_irqsave(&cm.lock, flags);
919 cm_cleanup_timewait(cm_id_priv->timewait_info);
920 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
921 spin_unlock_irqrestore(&cm.lock, flags);
922
923 /*
924 * The cm_id could be destroyed by the user before we exit timewait.
925 * To protect against this, we search for the cm_id after exiting
926 * timewait before notifying the user that we've exited timewait.
927 */
928 cm_id_priv->id.state = IB_CM_TIMEWAIT;
929 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
930
931 /* Check if the device started its remove_one */
932 spin_lock_irqsave(&cm.lock, flags);
933 if (!cm_dev->going_down)
934 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
935 msecs_to_jiffies(wait_time));
936 spin_unlock_irqrestore(&cm.lock, flags);
937
938 cm_id_priv->timewait_info = NULL;
939}
940
941static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
942{
943 unsigned long flags;
944
945 cm_id_priv->id.state = IB_CM_IDLE;
946 if (cm_id_priv->timewait_info) {
947 spin_lock_irqsave(&cm.lock, flags);
948 cm_cleanup_timewait(cm_id_priv->timewait_info);
949 spin_unlock_irqrestore(&cm.lock, flags);
950 kfree(cm_id_priv->timewait_info);
951 cm_id_priv->timewait_info = NULL;
952 }
953}
954
955static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
956{
957 struct cm_id_private *cm_id_priv;
958 struct cm_work *work;
959
960 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
961retest:
962 spin_lock_irq(&cm_id_priv->lock);
963 switch (cm_id->state) {
964 case IB_CM_LISTEN:
965 spin_unlock_irq(&cm_id_priv->lock);
966
967 spin_lock_irq(&cm.lock);
968 if (--cm_id_priv->listen_sharecount > 0) {
969 /* The id is still shared. */
970 cm_deref_id(cm_id_priv);
971 spin_unlock_irq(&cm.lock);
972 return;
973 }
974 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
975 spin_unlock_irq(&cm.lock);
976 break;
977 case IB_CM_SIDR_REQ_SENT:
978 cm_id->state = IB_CM_IDLE;
979 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
980 spin_unlock_irq(&cm_id_priv->lock);
981 break;
982 case IB_CM_SIDR_REQ_RCVD:
983 spin_unlock_irq(&cm_id_priv->lock);
984 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
985 spin_lock_irq(&cm.lock);
986 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node))
987 rb_erase(&cm_id_priv->sidr_id_node,
988 &cm.remote_sidr_table);
989 spin_unlock_irq(&cm.lock);
990 break;
991 case IB_CM_REQ_SENT:
992 case IB_CM_MRA_REQ_RCVD:
993 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
994 spin_unlock_irq(&cm_id_priv->lock);
995 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
996 &cm_id_priv->id.device->node_guid,
997 sizeof cm_id_priv->id.device->node_guid,
998 NULL, 0);
999 break;
1000 case IB_CM_REQ_RCVD:
1001 if (err == -ENOMEM) {
1002 /* Do not reject to allow future retries. */
1003 cm_reset_to_idle(cm_id_priv);
1004 spin_unlock_irq(&cm_id_priv->lock);
1005 } else {
1006 spin_unlock_irq(&cm_id_priv->lock);
1007 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1008 NULL, 0, NULL, 0);
1009 }
1010 break;
1011 case IB_CM_REP_SENT:
1012 case IB_CM_MRA_REP_RCVD:
1013 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1014 /* Fall through */
1015 case IB_CM_MRA_REQ_SENT:
1016 case IB_CM_REP_RCVD:
1017 case IB_CM_MRA_REP_SENT:
1018 spin_unlock_irq(&cm_id_priv->lock);
1019 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1020 NULL, 0, NULL, 0);
1021 break;
1022 case IB_CM_ESTABLISHED:
1023 spin_unlock_irq(&cm_id_priv->lock);
1024 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT)
1025 break;
1026 ib_send_cm_dreq(cm_id, NULL, 0);
1027 goto retest;
1028 case IB_CM_DREQ_SENT:
1029 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1030 cm_enter_timewait(cm_id_priv);
1031 spin_unlock_irq(&cm_id_priv->lock);
1032 break;
1033 case IB_CM_DREQ_RCVD:
1034 spin_unlock_irq(&cm_id_priv->lock);
1035 ib_send_cm_drep(cm_id, NULL, 0);
1036 break;
1037 default:
1038 spin_unlock_irq(&cm_id_priv->lock);
1039 break;
1040 }
1041
1042 spin_lock_irq(&cm.lock);
1043 if (!list_empty(&cm_id_priv->altr_list) &&
1044 (!cm_id_priv->altr_send_port_not_ready))
1045 list_del(&cm_id_priv->altr_list);
1046 if (!list_empty(&cm_id_priv->prim_list) &&
1047 (!cm_id_priv->prim_send_port_not_ready))
1048 list_del(&cm_id_priv->prim_list);
1049 spin_unlock_irq(&cm.lock);
1050
1051 cm_free_id(cm_id->local_id);
1052 cm_deref_id(cm_id_priv);
1053 wait_for_completion(&cm_id_priv->comp);
1054 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
1055 cm_free_work(work);
1056 kfree(cm_id_priv->private_data);
1057 kfree(cm_id_priv);
1058}
1059
1060void ib_destroy_cm_id(struct ib_cm_id *cm_id)
1061{
1062 cm_destroy_id(cm_id, 0);
1063}
1064EXPORT_SYMBOL(ib_destroy_cm_id);
1065
1066/**
1067 * __ib_cm_listen - Initiates listening on the specified service ID for
1068 * connection and service ID resolution requests.
1069 * @cm_id: Connection identifier associated with the listen request.
1070 * @service_id: Service identifier matched against incoming connection
1071 * and service ID resolution requests. The service ID should be specified
1072 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1073 * assign a service ID to the caller.
1074 * @service_mask: Mask applied to service ID used to listen across a
1075 * range of service IDs. If set to 0, the service ID is matched
1076 * exactly. This parameter is ignored if %service_id is set to
1077 * IB_CM_ASSIGN_SERVICE_ID.
1078 */
1079static int __ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id,
1080 __be64 service_mask)
1081{
1082 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
1083 int ret = 0;
1084
1085 service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
1086 service_id &= service_mask;
1087 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
1088 (service_id != IB_CM_ASSIGN_SERVICE_ID))
1089 return -EINVAL;
1090
1091 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1092 if (cm_id->state != IB_CM_IDLE)
1093 return -EINVAL;
1094
1095 cm_id->state = IB_CM_LISTEN;
1096 ++cm_id_priv->listen_sharecount;
1097
1098 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
1099 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
1100 cm_id->service_mask = ~cpu_to_be64(0);
1101 } else {
1102 cm_id->service_id = service_id;
1103 cm_id->service_mask = service_mask;
1104 }
1105 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
1106
1107 if (cur_cm_id_priv) {
1108 cm_id->state = IB_CM_IDLE;
1109 --cm_id_priv->listen_sharecount;
1110 ret = -EBUSY;
1111 }
1112 return ret;
1113}
1114
1115int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask)
1116{
1117 unsigned long flags;
1118 int ret;
1119
1120 spin_lock_irqsave(&cm.lock, flags);
1121 ret = __ib_cm_listen(cm_id, service_id, service_mask);
1122 spin_unlock_irqrestore(&cm.lock, flags);
1123
1124 return ret;
1125}
1126EXPORT_SYMBOL(ib_cm_listen);
1127
1128/**
1129 * Create a new listening ib_cm_id and listen on the given service ID.
1130 *
1131 * If there's an existing ID listening on that same device and service ID,
1132 * return it.
1133 *
1134 * @device: Device associated with the cm_id. All related communication will
1135 * be associated with the specified device.
1136 * @cm_handler: Callback invoked to notify the user of CM events.
1137 * @service_id: Service identifier matched against incoming connection
1138 * and service ID resolution requests. The service ID should be specified
1139 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1140 * assign a service ID to the caller.
1141 *
1142 * Callers should call ib_destroy_cm_id when done with the listener ID.
1143 */
1144struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device,
1145 ib_cm_handler cm_handler,
1146 __be64 service_id)
1147{
1148 struct cm_id_private *cm_id_priv;
1149 struct ib_cm_id *cm_id;
1150 unsigned long flags;
1151 int err = 0;
1152
1153 /* Create an ID in advance, since the creation may sleep */
1154 cm_id = ib_create_cm_id(device, cm_handler, NULL);
1155 if (IS_ERR(cm_id))
1156 return cm_id;
1157
1158 spin_lock_irqsave(&cm.lock, flags);
1159
1160 if (service_id == IB_CM_ASSIGN_SERVICE_ID)
1161 goto new_id;
1162
1163 /* Find an existing ID */
1164 cm_id_priv = cm_find_listen(device, service_id);
1165 if (cm_id_priv) {
1166 if (cm_id->cm_handler != cm_handler || cm_id->context) {
1167 /* Sharing an ib_cm_id with different handlers is not
1168 * supported */
1169 spin_unlock_irqrestore(&cm.lock, flags);
1170 return ERR_PTR(-EINVAL);
1171 }
1172 atomic_inc(&cm_id_priv->refcount);
1173 ++cm_id_priv->listen_sharecount;
1174 spin_unlock_irqrestore(&cm.lock, flags);
1175
1176 ib_destroy_cm_id(cm_id);
1177 cm_id = &cm_id_priv->id;
1178 return cm_id;
1179 }
1180
1181new_id:
1182 /* Use newly created ID */
1183 err = __ib_cm_listen(cm_id, service_id, 0);
1184
1185 spin_unlock_irqrestore(&cm.lock, flags);
1186
1187 if (err) {
1188 ib_destroy_cm_id(cm_id);
1189 return ERR_PTR(err);
1190 }
1191 return cm_id;
1192}
1193EXPORT_SYMBOL(ib_cm_insert_listen);
1194
1195static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
1196 enum cm_msg_sequence msg_seq)
1197{
1198 u64 hi_tid, low_tid;
1199
1200 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
1201 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
1202 (msg_seq << 30));
1203 return cpu_to_be64(hi_tid | low_tid);
1204}
1205
1206static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
1207 __be16 attr_id, __be64 tid)
1208{
1209 hdr->base_version = IB_MGMT_BASE_VERSION;
1210 hdr->mgmt_class = IB_MGMT_CLASS_CM;
1211 hdr->class_version = IB_CM_CLASS_VERSION;
1212 hdr->method = IB_MGMT_METHOD_SEND;
1213 hdr->attr_id = attr_id;
1214 hdr->tid = tid;
1215}
1216
1217static void cm_format_req(struct cm_req_msg *req_msg,
1218 struct cm_id_private *cm_id_priv,
1219 struct ib_cm_req_param *param)
1220{
1221 struct sa_path_rec *pri_path = param->primary_path;
1222 struct sa_path_rec *alt_path = param->alternate_path;
1223 bool pri_ext = false;
1224
1225 if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA)
1226 pri_ext = opa_is_extended_lid(pri_path->opa.dlid,
1227 pri_path->opa.slid);
1228
1229 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1230 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
1231
1232 req_msg->local_comm_id = cm_id_priv->id.local_id;
1233 req_msg->service_id = param->service_id;
1234 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1235 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
1236 cm_req_set_init_depth(req_msg, param->initiator_depth);
1237 cm_req_set_remote_resp_timeout(req_msg,
1238 param->remote_cm_response_timeout);
1239 cm_req_set_qp_type(req_msg, param->qp_type);
1240 cm_req_set_flow_ctrl(req_msg, param->flow_control);
1241 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
1242 cm_req_set_local_resp_timeout(req_msg,
1243 param->local_cm_response_timeout);
1244 req_msg->pkey = param->primary_path->pkey;
1245 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
1246 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
1247
1248 if (param->qp_type != IB_QPT_XRC_INI) {
1249 cm_req_set_resp_res(req_msg, param->responder_resources);
1250 cm_req_set_retry_count(req_msg, param->retry_count);
1251 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
1252 cm_req_set_srq(req_msg, param->srq);
1253 }
1254
1255 req_msg->primary_local_gid = pri_path->sgid;
1256 req_msg->primary_remote_gid = pri_path->dgid;
1257 if (pri_ext) {
1258 req_msg->primary_local_gid.global.interface_id
1259 = OPA_MAKE_ID(be32_to_cpu(pri_path->opa.slid));
1260 req_msg->primary_remote_gid.global.interface_id
1261 = OPA_MAKE_ID(be32_to_cpu(pri_path->opa.dlid));
1262 }
1263 if (pri_path->hop_limit <= 1) {
1264 req_msg->primary_local_lid = pri_ext ? 0 :
1265 htons(ntohl(sa_path_get_slid(pri_path)));
1266 req_msg->primary_remote_lid = pri_ext ? 0 :
1267 htons(ntohl(sa_path_get_dlid(pri_path)));
1268 } else {
1269 /* Work-around until there's a way to obtain remote LID info */
1270 req_msg->primary_local_lid = IB_LID_PERMISSIVE;
1271 req_msg->primary_remote_lid = IB_LID_PERMISSIVE;
1272 }
1273 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label);
1274 cm_req_set_primary_packet_rate(req_msg, pri_path->rate);
1275 req_msg->primary_traffic_class = pri_path->traffic_class;
1276 req_msg->primary_hop_limit = pri_path->hop_limit;
1277 cm_req_set_primary_sl(req_msg, pri_path->sl);
1278 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1));
1279 cm_req_set_primary_local_ack_timeout(req_msg,
1280 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1281 pri_path->packet_life_time));
1282
1283 if (alt_path) {
1284 bool alt_ext = false;
1285
1286 if (alt_path->rec_type == SA_PATH_REC_TYPE_OPA)
1287 alt_ext = opa_is_extended_lid(alt_path->opa.dlid,
1288 alt_path->opa.slid);
1289
1290 req_msg->alt_local_gid = alt_path->sgid;
1291 req_msg->alt_remote_gid = alt_path->dgid;
1292 if (alt_ext) {
1293 req_msg->alt_local_gid.global.interface_id
1294 = OPA_MAKE_ID(be32_to_cpu(alt_path->opa.slid));
1295 req_msg->alt_remote_gid.global.interface_id
1296 = OPA_MAKE_ID(be32_to_cpu(alt_path->opa.dlid));
1297 }
1298 if (alt_path->hop_limit <= 1) {
1299 req_msg->alt_local_lid = alt_ext ? 0 :
1300 htons(ntohl(sa_path_get_slid(alt_path)));
1301 req_msg->alt_remote_lid = alt_ext ? 0 :
1302 htons(ntohl(sa_path_get_dlid(alt_path)));
1303 } else {
1304 req_msg->alt_local_lid = IB_LID_PERMISSIVE;
1305 req_msg->alt_remote_lid = IB_LID_PERMISSIVE;
1306 }
1307 cm_req_set_alt_flow_label(req_msg,
1308 alt_path->flow_label);
1309 cm_req_set_alt_packet_rate(req_msg, alt_path->rate);
1310 req_msg->alt_traffic_class = alt_path->traffic_class;
1311 req_msg->alt_hop_limit = alt_path->hop_limit;
1312 cm_req_set_alt_sl(req_msg, alt_path->sl);
1313 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1));
1314 cm_req_set_alt_local_ack_timeout(req_msg,
1315 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1316 alt_path->packet_life_time));
1317 }
1318
1319 if (param->private_data && param->private_data_len)
1320 memcpy(req_msg->private_data, param->private_data,
1321 param->private_data_len);
1322}
1323
1324static int cm_validate_req_param(struct ib_cm_req_param *param)
1325{
1326 /* peer-to-peer not supported */
1327 if (param->peer_to_peer)
1328 return -EINVAL;
1329
1330 if (!param->primary_path)
1331 return -EINVAL;
1332
1333 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
1334 param->qp_type != IB_QPT_XRC_INI)
1335 return -EINVAL;
1336
1337 if (param->private_data &&
1338 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1339 return -EINVAL;
1340
1341 if (param->alternate_path &&
1342 (param->alternate_path->pkey != param->primary_path->pkey ||
1343 param->alternate_path->mtu != param->primary_path->mtu))
1344 return -EINVAL;
1345
1346 return 0;
1347}
1348
1349int ib_send_cm_req(struct ib_cm_id *cm_id,
1350 struct ib_cm_req_param *param)
1351{
1352 struct cm_id_private *cm_id_priv;
1353 struct cm_req_msg *req_msg;
1354 unsigned long flags;
1355 int ret;
1356
1357 ret = cm_validate_req_param(param);
1358 if (ret)
1359 return ret;
1360
1361 /* Verify that we're not in timewait. */
1362 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1363 spin_lock_irqsave(&cm_id_priv->lock, flags);
1364 if (cm_id->state != IB_CM_IDLE) {
1365 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1366 ret = -EINVAL;
1367 goto out;
1368 }
1369 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1370
1371 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1372 id.local_id);
1373 if (IS_ERR(cm_id_priv->timewait_info)) {
1374 ret = PTR_ERR(cm_id_priv->timewait_info);
1375 goto out;
1376 }
1377
1378 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av,
1379 cm_id_priv);
1380 if (ret)
1381 goto error1;
1382 if (param->alternate_path) {
1383 ret = cm_init_av_by_path(param->alternate_path,
1384 &cm_id_priv->alt_av, cm_id_priv);
1385 if (ret)
1386 goto error1;
1387 }
1388 cm_id->service_id = param->service_id;
1389 cm_id->service_mask = ~cpu_to_be64(0);
1390 cm_id_priv->timeout_ms = cm_convert_to_ms(
1391 param->primary_path->packet_life_time) * 2 +
1392 cm_convert_to_ms(
1393 param->remote_cm_response_timeout);
1394 cm_id_priv->max_cm_retries = param->max_cm_retries;
1395 cm_id_priv->initiator_depth = param->initiator_depth;
1396 cm_id_priv->responder_resources = param->responder_resources;
1397 cm_id_priv->retry_count = param->retry_count;
1398 cm_id_priv->path_mtu = param->primary_path->mtu;
1399 cm_id_priv->pkey = param->primary_path->pkey;
1400 cm_id_priv->qp_type = param->qp_type;
1401
1402 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1403 if (ret)
1404 goto error1;
1405
1406 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1407 cm_format_req(req_msg, cm_id_priv, param);
1408 cm_id_priv->tid = req_msg->hdr.tid;
1409 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1410 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1411
1412 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1413 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1414
1415 spin_lock_irqsave(&cm_id_priv->lock, flags);
1416 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1417 if (ret) {
1418 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1419 goto error2;
1420 }
1421 BUG_ON(cm_id->state != IB_CM_IDLE);
1422 cm_id->state = IB_CM_REQ_SENT;
1423 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1424 return 0;
1425
1426error2: cm_free_msg(cm_id_priv->msg);
1427error1: kfree(cm_id_priv->timewait_info);
1428out: return ret;
1429}
1430EXPORT_SYMBOL(ib_send_cm_req);
1431
1432static int cm_issue_rej(struct cm_port *port,
1433 struct ib_mad_recv_wc *mad_recv_wc,
1434 enum ib_cm_rej_reason reason,
1435 enum cm_msg_response msg_rejected,
1436 void *ari, u8 ari_length)
1437{
1438 struct ib_mad_send_buf *msg = NULL;
1439 struct cm_rej_msg *rej_msg, *rcv_msg;
1440 int ret;
1441
1442 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1443 if (ret)
1444 return ret;
1445
1446 /* We just need common CM header information. Cast to any message. */
1447 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1448 rej_msg = (struct cm_rej_msg *) msg->mad;
1449
1450 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1451 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1452 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1453 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1454 rej_msg->reason = cpu_to_be16(reason);
1455
1456 if (ari && ari_length) {
1457 cm_rej_set_reject_info_len(rej_msg, ari_length);
1458 memcpy(rej_msg->ari, ari, ari_length);
1459 }
1460
1461 ret = ib_post_send_mad(msg, NULL);
1462 if (ret)
1463 cm_free_msg(msg);
1464
1465 return ret;
1466}
1467
1468static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1469 __be32 local_qpn, __be32 remote_qpn)
1470{
1471 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1472 ((local_ca_guid == remote_ca_guid) &&
1473 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1474}
1475
1476static bool cm_req_has_alt_path(struct cm_req_msg *req_msg)
1477{
1478 return ((req_msg->alt_local_lid) ||
1479 (ib_is_opa_gid(&req_msg->alt_local_gid)));
1480}
1481
1482static void cm_path_set_rec_type(struct ib_device *ib_device, u8 port_num,
1483 struct sa_path_rec *path, union ib_gid *gid)
1484{
1485 if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num))
1486 path->rec_type = SA_PATH_REC_TYPE_OPA;
1487 else
1488 path->rec_type = SA_PATH_REC_TYPE_IB;
1489}
1490
1491static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg,
1492 struct sa_path_rec *primary_path,
1493 struct sa_path_rec *alt_path)
1494{
1495 u32 lid;
1496
1497 if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1498 sa_path_set_dlid(primary_path,
1499 ntohs(req_msg->primary_local_lid));
1500 sa_path_set_slid(primary_path,
1501 ntohs(req_msg->primary_remote_lid));
1502 } else {
1503 lid = opa_get_lid_from_gid(&req_msg->primary_local_gid);
1504 sa_path_set_dlid(primary_path, lid);
1505
1506 lid = opa_get_lid_from_gid(&req_msg->primary_remote_gid);
1507 sa_path_set_slid(primary_path, lid);
1508 }
1509
1510 if (!cm_req_has_alt_path(req_msg))
1511 return;
1512
1513 if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1514 sa_path_set_dlid(alt_path, ntohs(req_msg->alt_local_lid));
1515 sa_path_set_slid(alt_path, ntohs(req_msg->alt_remote_lid));
1516 } else {
1517 lid = opa_get_lid_from_gid(&req_msg->alt_local_gid);
1518 sa_path_set_dlid(alt_path, lid);
1519
1520 lid = opa_get_lid_from_gid(&req_msg->alt_remote_gid);
1521 sa_path_set_slid(alt_path, lid);
1522 }
1523}
1524
1525static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1526 struct sa_path_rec *primary_path,
1527 struct sa_path_rec *alt_path)
1528{
1529 primary_path->dgid = req_msg->primary_local_gid;
1530 primary_path->sgid = req_msg->primary_remote_gid;
1531 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1532 primary_path->hop_limit = req_msg->primary_hop_limit;
1533 primary_path->traffic_class = req_msg->primary_traffic_class;
1534 primary_path->reversible = 1;
1535 primary_path->pkey = req_msg->pkey;
1536 primary_path->sl = cm_req_get_primary_sl(req_msg);
1537 primary_path->mtu_selector = IB_SA_EQ;
1538 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1539 primary_path->rate_selector = IB_SA_EQ;
1540 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1541 primary_path->packet_life_time_selector = IB_SA_EQ;
1542 primary_path->packet_life_time =
1543 cm_req_get_primary_local_ack_timeout(req_msg);
1544 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1545 primary_path->service_id = req_msg->service_id;
1546 if (sa_path_is_roce(primary_path))
1547 primary_path->roce.route_resolved = false;
1548
1549 if (cm_req_has_alt_path(req_msg)) {
1550 alt_path->dgid = req_msg->alt_local_gid;
1551 alt_path->sgid = req_msg->alt_remote_gid;
1552 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1553 alt_path->hop_limit = req_msg->alt_hop_limit;
1554 alt_path->traffic_class = req_msg->alt_traffic_class;
1555 alt_path->reversible = 1;
1556 alt_path->pkey = req_msg->pkey;
1557 alt_path->sl = cm_req_get_alt_sl(req_msg);
1558 alt_path->mtu_selector = IB_SA_EQ;
1559 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1560 alt_path->rate_selector = IB_SA_EQ;
1561 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1562 alt_path->packet_life_time_selector = IB_SA_EQ;
1563 alt_path->packet_life_time =
1564 cm_req_get_alt_local_ack_timeout(req_msg);
1565 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1566 alt_path->service_id = req_msg->service_id;
1567
1568 if (sa_path_is_roce(alt_path))
1569 alt_path->roce.route_resolved = false;
1570 }
1571 cm_format_path_lid_from_req(req_msg, primary_path, alt_path);
1572}
1573
1574static u16 cm_get_bth_pkey(struct cm_work *work)
1575{
1576 struct ib_device *ib_dev = work->port->cm_dev->ib_device;
1577 u8 port_num = work->port->port_num;
1578 u16 pkey_index = work->mad_recv_wc->wc->pkey_index;
1579 u16 pkey;
1580 int ret;
1581
1582 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey);
1583 if (ret) {
1584 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n",
1585 port_num, pkey_index, ret);
1586 return 0;
1587 }
1588
1589 return pkey;
1590}
1591
1592/**
1593 * Convert OPA SGID to IB SGID
1594 * ULPs (such as IPoIB) do not understand OPA GIDs and will
1595 * reject them as the local_gid will not match the sgid. Therefore,
1596 * change the pathrec's SGID to an IB SGID.
1597 *
1598 * @work: Work completion
1599 * @path: Path record
1600 */
1601static void cm_opa_to_ib_sgid(struct cm_work *work,
1602 struct sa_path_rec *path)
1603{
1604 struct ib_device *dev = work->port->cm_dev->ib_device;
1605 u8 port_num = work->port->port_num;
1606
1607 if (rdma_cap_opa_ah(dev, port_num) &&
1608 (ib_is_opa_gid(&path->sgid))) {
1609 union ib_gid sgid;
1610
1611 if (ib_get_cached_gid(dev, port_num, 0, &sgid, NULL)) {
1612 dev_warn(&dev->dev,
1613 "Error updating sgid in CM request\n");
1614 return;
1615 }
1616
1617 path->sgid = sgid;
1618 }
1619}
1620
1621static void cm_format_req_event(struct cm_work *work,
1622 struct cm_id_private *cm_id_priv,
1623 struct ib_cm_id *listen_id)
1624{
1625 struct cm_req_msg *req_msg;
1626 struct ib_cm_req_event_param *param;
1627
1628 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1629 param = &work->cm_event.param.req_rcvd;
1630 param->listen_id = listen_id;
1631 param->bth_pkey = cm_get_bth_pkey(work);
1632 param->port = cm_id_priv->av.port->port_num;
1633 param->primary_path = &work->path[0];
1634 cm_opa_to_ib_sgid(work, param->primary_path);
1635 if (cm_req_has_alt_path(req_msg)) {
1636 param->alternate_path = &work->path[1];
1637 cm_opa_to_ib_sgid(work, param->alternate_path);
1638 } else {
1639 param->alternate_path = NULL;
1640 }
1641 param->remote_ca_guid = req_msg->local_ca_guid;
1642 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1643 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1644 param->qp_type = cm_req_get_qp_type(req_msg);
1645 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1646 param->responder_resources = cm_req_get_init_depth(req_msg);
1647 param->initiator_depth = cm_req_get_resp_res(req_msg);
1648 param->local_cm_response_timeout =
1649 cm_req_get_remote_resp_timeout(req_msg);
1650 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1651 param->remote_cm_response_timeout =
1652 cm_req_get_local_resp_timeout(req_msg);
1653 param->retry_count = cm_req_get_retry_count(req_msg);
1654 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1655 param->srq = cm_req_get_srq(req_msg);
1656 work->cm_event.private_data = &req_msg->private_data;
1657}
1658
1659static void cm_process_work(struct cm_id_private *cm_id_priv,
1660 struct cm_work *work)
1661{
1662 int ret;
1663
1664 /* We will typically only have the current event to report. */
1665 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1666 cm_free_work(work);
1667
1668 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1669 spin_lock_irq(&cm_id_priv->lock);
1670 work = cm_dequeue_work(cm_id_priv);
1671 spin_unlock_irq(&cm_id_priv->lock);
1672 BUG_ON(!work);
1673 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1674 &work->cm_event);
1675 cm_free_work(work);
1676 }
1677 cm_deref_id(cm_id_priv);
1678 if (ret)
1679 cm_destroy_id(&cm_id_priv->id, ret);
1680}
1681
1682static void cm_format_mra(struct cm_mra_msg *mra_msg,
1683 struct cm_id_private *cm_id_priv,
1684 enum cm_msg_response msg_mraed, u8 service_timeout,
1685 const void *private_data, u8 private_data_len)
1686{
1687 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1688 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1689 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1690 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1691 cm_mra_set_service_timeout(mra_msg, service_timeout);
1692
1693 if (private_data && private_data_len)
1694 memcpy(mra_msg->private_data, private_data, private_data_len);
1695}
1696
1697static void cm_format_rej(struct cm_rej_msg *rej_msg,
1698 struct cm_id_private *cm_id_priv,
1699 enum ib_cm_rej_reason reason,
1700 void *ari,
1701 u8 ari_length,
1702 const void *private_data,
1703 u8 private_data_len)
1704{
1705 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1706 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1707
1708 switch(cm_id_priv->id.state) {
1709 case IB_CM_REQ_RCVD:
1710 rej_msg->local_comm_id = 0;
1711 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1712 break;
1713 case IB_CM_MRA_REQ_SENT:
1714 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1715 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1716 break;
1717 case IB_CM_REP_RCVD:
1718 case IB_CM_MRA_REP_SENT:
1719 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1720 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1721 break;
1722 default:
1723 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1724 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1725 break;
1726 }
1727
1728 rej_msg->reason = cpu_to_be16(reason);
1729 if (ari && ari_length) {
1730 cm_rej_set_reject_info_len(rej_msg, ari_length);
1731 memcpy(rej_msg->ari, ari, ari_length);
1732 }
1733
1734 if (private_data && private_data_len)
1735 memcpy(rej_msg->private_data, private_data, private_data_len);
1736}
1737
1738static void cm_dup_req_handler(struct cm_work *work,
1739 struct cm_id_private *cm_id_priv)
1740{
1741 struct ib_mad_send_buf *msg = NULL;
1742 int ret;
1743
1744 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1745 counter[CM_REQ_COUNTER]);
1746
1747 /* Quick state check to discard duplicate REQs. */
1748 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1749 return;
1750
1751 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1752 if (ret)
1753 return;
1754
1755 spin_lock_irq(&cm_id_priv->lock);
1756 switch (cm_id_priv->id.state) {
1757 case IB_CM_MRA_REQ_SENT:
1758 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1759 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1760 cm_id_priv->private_data,
1761 cm_id_priv->private_data_len);
1762 break;
1763 case IB_CM_TIMEWAIT:
1764 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1765 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1766 break;
1767 default:
1768 goto unlock;
1769 }
1770 spin_unlock_irq(&cm_id_priv->lock);
1771
1772 ret = ib_post_send_mad(msg, NULL);
1773 if (ret)
1774 goto free;
1775 return;
1776
1777unlock: spin_unlock_irq(&cm_id_priv->lock);
1778free: cm_free_msg(msg);
1779}
1780
1781static struct cm_id_private * cm_match_req(struct cm_work *work,
1782 struct cm_id_private *cm_id_priv)
1783{
1784 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1785 struct cm_timewait_info *timewait_info;
1786 struct cm_req_msg *req_msg;
1787 struct ib_cm_id *cm_id;
1788
1789 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1790
1791 /* Check for possible duplicate REQ. */
1792 spin_lock_irq(&cm.lock);
1793 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1794 if (timewait_info) {
1795 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1796 timewait_info->work.remote_id);
1797 spin_unlock_irq(&cm.lock);
1798 if (cur_cm_id_priv) {
1799 cm_dup_req_handler(work, cur_cm_id_priv);
1800 cm_deref_id(cur_cm_id_priv);
1801 }
1802 return NULL;
1803 }
1804
1805 /* Check for stale connections. */
1806 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1807 if (timewait_info) {
1808 cm_cleanup_timewait(cm_id_priv->timewait_info);
1809 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1810 timewait_info->work.remote_id);
1811
1812 spin_unlock_irq(&cm.lock);
1813 cm_issue_rej(work->port, work->mad_recv_wc,
1814 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1815 NULL, 0);
1816 if (cur_cm_id_priv) {
1817 cm_id = &cur_cm_id_priv->id;
1818 ib_send_cm_dreq(cm_id, NULL, 0);
1819 cm_deref_id(cur_cm_id_priv);
1820 }
1821 return NULL;
1822 }
1823
1824 /* Find matching listen request. */
1825 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1826 req_msg->service_id);
1827 if (!listen_cm_id_priv) {
1828 cm_cleanup_timewait(cm_id_priv->timewait_info);
1829 spin_unlock_irq(&cm.lock);
1830 cm_issue_rej(work->port, work->mad_recv_wc,
1831 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1832 NULL, 0);
1833 goto out;
1834 }
1835 atomic_inc(&listen_cm_id_priv->refcount);
1836 atomic_inc(&cm_id_priv->refcount);
1837 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1838 atomic_inc(&cm_id_priv->work_count);
1839 spin_unlock_irq(&cm.lock);
1840out:
1841 return listen_cm_id_priv;
1842}
1843
1844/*
1845 * Work-around for inter-subnet connections. If the LIDs are permissive,
1846 * we need to override the LID/SL data in the REQ with the LID information
1847 * in the work completion.
1848 */
1849static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
1850{
1851 if (!cm_req_get_primary_subnet_local(req_msg)) {
1852 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) {
1853 req_msg->primary_local_lid = ib_lid_be16(wc->slid);
1854 cm_req_set_primary_sl(req_msg, wc->sl);
1855 }
1856
1857 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE)
1858 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1859 }
1860
1861 if (!cm_req_get_alt_subnet_local(req_msg)) {
1862 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) {
1863 req_msg->alt_local_lid = ib_lid_be16(wc->slid);
1864 cm_req_set_alt_sl(req_msg, wc->sl);
1865 }
1866
1867 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE)
1868 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1869 }
1870}
1871
1872static int cm_req_handler(struct cm_work *work)
1873{
1874 struct ib_cm_id *cm_id;
1875 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1876 struct cm_req_msg *req_msg;
1877 union ib_gid gid;
1878 struct ib_gid_attr gid_attr;
1879 const struct ib_global_route *grh;
1880 int ret;
1881
1882 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1883
1884 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
1885 if (IS_ERR(cm_id))
1886 return PTR_ERR(cm_id);
1887
1888 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1889 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1890 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1891 work->mad_recv_wc->recv_buf.grh,
1892 &cm_id_priv->av);
1893 if (ret)
1894 goto destroy;
1895 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1896 id.local_id);
1897 if (IS_ERR(cm_id_priv->timewait_info)) {
1898 ret = PTR_ERR(cm_id_priv->timewait_info);
1899 goto destroy;
1900 }
1901 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1902 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1903 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1904
1905 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1906 if (!listen_cm_id_priv) {
1907 pr_debug("%s: local_id %d, no listen_cm_id_priv\n", __func__,
1908 be32_to_cpu(cm_id->local_id));
1909 ret = -EINVAL;
1910 goto free_timeinfo;
1911 }
1912
1913 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1914 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1915 cm_id_priv->id.service_id = req_msg->service_id;
1916 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
1917
1918 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
1919
1920 memset(&work->path[0], 0, sizeof(work->path[0]));
1921 if (cm_req_has_alt_path(req_msg))
1922 memset(&work->path[1], 0, sizeof(work->path[1]));
1923 grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr);
1924 ret = ib_get_cached_gid(work->port->cm_dev->ib_device,
1925 work->port->port_num,
1926 grh->sgid_index,
1927 &gid, &gid_attr);
1928 if (ret) {
1929 ib_send_cm_rej(cm_id, IB_CM_REJ_UNSUPPORTED, NULL, 0, NULL, 0);
1930 goto rejected;
1931 }
1932
1933 if (gid_attr.ndev) {
1934 work->path[0].rec_type =
1935 sa_conv_gid_to_pathrec_type(gid_attr.gid_type);
1936 sa_path_set_ifindex(&work->path[0],
1937 gid_attr.ndev->ifindex);
1938 sa_path_set_ndev(&work->path[0],
1939 dev_net(gid_attr.ndev));
1940 dev_put(gid_attr.ndev);
1941 } else {
1942 cm_path_set_rec_type(work->port->cm_dev->ib_device,
1943 work->port->port_num,
1944 &work->path[0],
1945 &req_msg->primary_local_gid);
1946 }
1947 if (cm_req_has_alt_path(req_msg))
1948 work->path[1].rec_type = work->path[0].rec_type;
1949 cm_format_paths_from_req(req_msg, &work->path[0],
1950 &work->path[1]);
1951 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE)
1952 sa_path_set_dmac(&work->path[0],
1953 cm_id_priv->av.ah_attr.roce.dmac);
1954 work->path[0].hop_limit = grh->hop_limit;
1955 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av,
1956 cm_id_priv);
1957 if (ret) {
1958 int err;
1959
1960 err = ib_get_cached_gid(work->port->cm_dev->ib_device,
1961 work->port->port_num, 0,
1962 &work->path[0].sgid,
1963 NULL);
1964 if (err)
1965 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1966 NULL, 0, NULL, 0);
1967 else
1968 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1969 &work->path[0].sgid,
1970 sizeof(work->path[0].sgid),
1971 NULL, 0);
1972 goto rejected;
1973 }
1974 if (cm_req_has_alt_path(req_msg)) {
1975 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av,
1976 cm_id_priv);
1977 if (ret) {
1978 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1979 &work->path[0].sgid,
1980 sizeof(work->path[0].sgid), NULL, 0);
1981 goto rejected;
1982 }
1983 }
1984 cm_id_priv->tid = req_msg->hdr.tid;
1985 cm_id_priv->timeout_ms = cm_convert_to_ms(
1986 cm_req_get_local_resp_timeout(req_msg));
1987 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1988 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1989 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1990 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1991 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1992 cm_id_priv->pkey = req_msg->pkey;
1993 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1994 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1995 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1996 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1997
1998 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1999 cm_process_work(cm_id_priv, work);
2000 cm_deref_id(listen_cm_id_priv);
2001 return 0;
2002
2003rejected:
2004 atomic_dec(&cm_id_priv->refcount);
2005 cm_deref_id(listen_cm_id_priv);
2006free_timeinfo:
2007 kfree(cm_id_priv->timewait_info);
2008destroy:
2009 ib_destroy_cm_id(cm_id);
2010 return ret;
2011}
2012
2013static void cm_format_rep(struct cm_rep_msg *rep_msg,
2014 struct cm_id_private *cm_id_priv,
2015 struct ib_cm_rep_param *param)
2016{
2017 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
2018 rep_msg->local_comm_id = cm_id_priv->id.local_id;
2019 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
2020 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
2021 rep_msg->resp_resources = param->responder_resources;
2022 cm_rep_set_target_ack_delay(rep_msg,
2023 cm_id_priv->av.port->cm_dev->ack_delay);
2024 cm_rep_set_failover(rep_msg, param->failover_accepted);
2025 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
2026 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
2027
2028 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
2029 rep_msg->initiator_depth = param->initiator_depth;
2030 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
2031 cm_rep_set_srq(rep_msg, param->srq);
2032 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
2033 } else {
2034 cm_rep_set_srq(rep_msg, 1);
2035 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num));
2036 }
2037
2038 if (param->private_data && param->private_data_len)
2039 memcpy(rep_msg->private_data, param->private_data,
2040 param->private_data_len);
2041}
2042
2043int ib_send_cm_rep(struct ib_cm_id *cm_id,
2044 struct ib_cm_rep_param *param)
2045{
2046 struct cm_id_private *cm_id_priv;
2047 struct ib_mad_send_buf *msg;
2048 struct cm_rep_msg *rep_msg;
2049 unsigned long flags;
2050 int ret;
2051
2052 if (param->private_data &&
2053 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
2054 return -EINVAL;
2055
2056 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2057 spin_lock_irqsave(&cm_id_priv->lock, flags);
2058 if (cm_id->state != IB_CM_REQ_RCVD &&
2059 cm_id->state != IB_CM_MRA_REQ_SENT) {
2060 pr_debug("%s: local_comm_id %d, cm_id->state: %d\n", __func__,
2061 be32_to_cpu(cm_id_priv->id.local_id), cm_id->state);
2062 ret = -EINVAL;
2063 goto out;
2064 }
2065
2066 ret = cm_alloc_msg(cm_id_priv, &msg);
2067 if (ret)
2068 goto out;
2069
2070 rep_msg = (struct cm_rep_msg *) msg->mad;
2071 cm_format_rep(rep_msg, cm_id_priv, param);
2072 msg->timeout_ms = cm_id_priv->timeout_ms;
2073 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
2074
2075 ret = ib_post_send_mad(msg, NULL);
2076 if (ret) {
2077 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2078 cm_free_msg(msg);
2079 return ret;
2080 }
2081
2082 cm_id->state = IB_CM_REP_SENT;
2083 cm_id_priv->msg = msg;
2084 cm_id_priv->initiator_depth = param->initiator_depth;
2085 cm_id_priv->responder_resources = param->responder_resources;
2086 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
2087 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
2088
2089out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2090 return ret;
2091}
2092EXPORT_SYMBOL(ib_send_cm_rep);
2093
2094static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
2095 struct cm_id_private *cm_id_priv,
2096 const void *private_data,
2097 u8 private_data_len)
2098{
2099 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
2100 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
2101 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
2102
2103 if (private_data && private_data_len)
2104 memcpy(rtu_msg->private_data, private_data, private_data_len);
2105}
2106
2107int ib_send_cm_rtu(struct ib_cm_id *cm_id,
2108 const void *private_data,
2109 u8 private_data_len)
2110{
2111 struct cm_id_private *cm_id_priv;
2112 struct ib_mad_send_buf *msg;
2113 unsigned long flags;
2114 void *data;
2115 int ret;
2116
2117 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
2118 return -EINVAL;
2119
2120 data = cm_copy_private_data(private_data, private_data_len);
2121 if (IS_ERR(data))
2122 return PTR_ERR(data);
2123
2124 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2125 spin_lock_irqsave(&cm_id_priv->lock, flags);
2126 if (cm_id->state != IB_CM_REP_RCVD &&
2127 cm_id->state != IB_CM_MRA_REP_SENT) {
2128 pr_debug("%s: local_id %d, cm_id->state %d\n", __func__,
2129 be32_to_cpu(cm_id->local_id), cm_id->state);
2130 ret = -EINVAL;
2131 goto error;
2132 }
2133
2134 ret = cm_alloc_msg(cm_id_priv, &msg);
2135 if (ret)
2136 goto error;
2137
2138 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2139 private_data, private_data_len);
2140
2141 ret = ib_post_send_mad(msg, NULL);
2142 if (ret) {
2143 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2144 cm_free_msg(msg);
2145 kfree(data);
2146 return ret;
2147 }
2148
2149 cm_id->state = IB_CM_ESTABLISHED;
2150 cm_set_private_data(cm_id_priv, data, private_data_len);
2151 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2152 return 0;
2153
2154error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2155 kfree(data);
2156 return ret;
2157}
2158EXPORT_SYMBOL(ib_send_cm_rtu);
2159
2160static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
2161{
2162 struct cm_rep_msg *rep_msg;
2163 struct ib_cm_rep_event_param *param;
2164
2165 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2166 param = &work->cm_event.param.rep_rcvd;
2167 param->remote_ca_guid = rep_msg->local_ca_guid;
2168 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
2169 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
2170 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
2171 param->responder_resources = rep_msg->initiator_depth;
2172 param->initiator_depth = rep_msg->resp_resources;
2173 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
2174 param->failover_accepted = cm_rep_get_failover(rep_msg);
2175 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
2176 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
2177 param->srq = cm_rep_get_srq(rep_msg);
2178 work->cm_event.private_data = &rep_msg->private_data;
2179}
2180
2181static void cm_dup_rep_handler(struct cm_work *work)
2182{
2183 struct cm_id_private *cm_id_priv;
2184 struct cm_rep_msg *rep_msg;
2185 struct ib_mad_send_buf *msg = NULL;
2186 int ret;
2187
2188 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
2189 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
2190 rep_msg->local_comm_id);
2191 if (!cm_id_priv)
2192 return;
2193
2194 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2195 counter[CM_REP_COUNTER]);
2196 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
2197 if (ret)
2198 goto deref;
2199
2200 spin_lock_irq(&cm_id_priv->lock);
2201 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
2202 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2203 cm_id_priv->private_data,
2204 cm_id_priv->private_data_len);
2205 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
2206 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2207 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
2208 cm_id_priv->private_data,
2209 cm_id_priv->private_data_len);
2210 else
2211 goto unlock;
2212 spin_unlock_irq(&cm_id_priv->lock);
2213
2214 ret = ib_post_send_mad(msg, NULL);
2215 if (ret)
2216 goto free;
2217 goto deref;
2218
2219unlock: spin_unlock_irq(&cm_id_priv->lock);
2220free: cm_free_msg(msg);
2221deref: cm_deref_id(cm_id_priv);
2222}
2223
2224static int cm_rep_handler(struct cm_work *work)
2225{
2226 struct cm_id_private *cm_id_priv;
2227 struct cm_rep_msg *rep_msg;
2228 int ret;
2229 struct cm_id_private *cur_cm_id_priv;
2230 struct ib_cm_id *cm_id;
2231 struct cm_timewait_info *timewait_info;
2232
2233 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2234 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
2235 if (!cm_id_priv) {
2236 cm_dup_rep_handler(work);
2237 pr_debug("%s: remote_comm_id %d, no cm_id_priv\n", __func__,
2238 be32_to_cpu(rep_msg->remote_comm_id));
2239 return -EINVAL;
2240 }
2241
2242 cm_format_rep_event(work, cm_id_priv->qp_type);
2243
2244 spin_lock_irq(&cm_id_priv->lock);
2245 switch (cm_id_priv->id.state) {
2246 case IB_CM_REQ_SENT:
2247 case IB_CM_MRA_REQ_RCVD:
2248 break;
2249 default:
2250 spin_unlock_irq(&cm_id_priv->lock);
2251 ret = -EINVAL;
2252 pr_debug("%s: cm_id_priv->id.state: %d, local_comm_id %d, remote_comm_id %d\n",
2253 __func__, cm_id_priv->id.state,
2254 be32_to_cpu(rep_msg->local_comm_id),
2255 be32_to_cpu(rep_msg->remote_comm_id));
2256 goto error;
2257 }
2258
2259 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
2260 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
2261 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2262
2263 spin_lock(&cm.lock);
2264 /* Check for duplicate REP. */
2265 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
2266 spin_unlock(&cm.lock);
2267 spin_unlock_irq(&cm_id_priv->lock);
2268 ret = -EINVAL;
2269 pr_debug("%s: Failed to insert remote id %d\n", __func__,
2270 be32_to_cpu(rep_msg->remote_comm_id));
2271 goto error;
2272 }
2273 /* Check for a stale connection. */
2274 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
2275 if (timewait_info) {
2276 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
2277 &cm.remote_id_table);
2278 cm_id_priv->timewait_info->inserted_remote_id = 0;
2279 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
2280 timewait_info->work.remote_id);
2281
2282 spin_unlock(&cm.lock);
2283 spin_unlock_irq(&cm_id_priv->lock);
2284 cm_issue_rej(work->port, work->mad_recv_wc,
2285 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
2286 NULL, 0);
2287 ret = -EINVAL;
2288 pr_debug("%s: Stale connection. local_comm_id %d, remote_comm_id %d\n",
2289 __func__, be32_to_cpu(rep_msg->local_comm_id),
2290 be32_to_cpu(rep_msg->remote_comm_id));
2291
2292 if (cur_cm_id_priv) {
2293 cm_id = &cur_cm_id_priv->id;
2294 ib_send_cm_dreq(cm_id, NULL, 0);
2295 cm_deref_id(cur_cm_id_priv);
2296 }
2297
2298 goto error;
2299 }
2300 spin_unlock(&cm.lock);
2301
2302 cm_id_priv->id.state = IB_CM_REP_RCVD;
2303 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
2304 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2305 cm_id_priv->initiator_depth = rep_msg->resp_resources;
2306 cm_id_priv->responder_resources = rep_msg->initiator_depth;
2307 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
2308 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
2309 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
2310 cm_id_priv->av.timeout =
2311 cm_ack_timeout(cm_id_priv->target_ack_delay,
2312 cm_id_priv->av.timeout - 1);
2313 cm_id_priv->alt_av.timeout =
2314 cm_ack_timeout(cm_id_priv->target_ack_delay,
2315 cm_id_priv->alt_av.timeout - 1);
2316
2317 /* todo: handle peer_to_peer */
2318
2319 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2320 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2321 if (!ret)
2322 list_add_tail(&work->list, &cm_id_priv->work_list);
2323 spin_unlock_irq(&cm_id_priv->lock);
2324
2325 if (ret)
2326 cm_process_work(cm_id_priv, work);
2327 else
2328 cm_deref_id(cm_id_priv);
2329 return 0;
2330
2331error:
2332 cm_deref_id(cm_id_priv);
2333 return ret;
2334}
2335
2336static int cm_establish_handler(struct cm_work *work)
2337{
2338 struct cm_id_private *cm_id_priv;
2339 int ret;
2340
2341 /* See comment in cm_establish about lookup. */
2342 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
2343 if (!cm_id_priv)
2344 return -EINVAL;
2345
2346 spin_lock_irq(&cm_id_priv->lock);
2347 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
2348 spin_unlock_irq(&cm_id_priv->lock);
2349 goto out;
2350 }
2351
2352 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2353 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2354 if (!ret)
2355 list_add_tail(&work->list, &cm_id_priv->work_list);
2356 spin_unlock_irq(&cm_id_priv->lock);
2357
2358 if (ret)
2359 cm_process_work(cm_id_priv, work);
2360 else
2361 cm_deref_id(cm_id_priv);
2362 return 0;
2363out:
2364 cm_deref_id(cm_id_priv);
2365 return -EINVAL;
2366}
2367
2368static int cm_rtu_handler(struct cm_work *work)
2369{
2370 struct cm_id_private *cm_id_priv;
2371 struct cm_rtu_msg *rtu_msg;
2372 int ret;
2373
2374 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
2375 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
2376 rtu_msg->local_comm_id);
2377 if (!cm_id_priv)
2378 return -EINVAL;
2379
2380 work->cm_event.private_data = &rtu_msg->private_data;
2381
2382 spin_lock_irq(&cm_id_priv->lock);
2383 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
2384 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
2385 spin_unlock_irq(&cm_id_priv->lock);
2386 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2387 counter[CM_RTU_COUNTER]);
2388 goto out;
2389 }
2390 cm_id_priv->id.state = IB_CM_ESTABLISHED;
2391
2392 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2393 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2394 if (!ret)
2395 list_add_tail(&work->list, &cm_id_priv->work_list);
2396 spin_unlock_irq(&cm_id_priv->lock);
2397
2398 if (ret)
2399 cm_process_work(cm_id_priv, work);
2400 else
2401 cm_deref_id(cm_id_priv);
2402 return 0;
2403out:
2404 cm_deref_id(cm_id_priv);
2405 return -EINVAL;
2406}
2407
2408static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
2409 struct cm_id_private *cm_id_priv,
2410 const void *private_data,
2411 u8 private_data_len)
2412{
2413 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
2414 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
2415 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
2416 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
2417 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
2418
2419 if (private_data && private_data_len)
2420 memcpy(dreq_msg->private_data, private_data, private_data_len);
2421}
2422
2423int ib_send_cm_dreq(struct ib_cm_id *cm_id,
2424 const void *private_data,
2425 u8 private_data_len)
2426{
2427 struct cm_id_private *cm_id_priv;
2428 struct ib_mad_send_buf *msg;
2429 unsigned long flags;
2430 int ret;
2431
2432 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
2433 return -EINVAL;
2434
2435 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2436 spin_lock_irqsave(&cm_id_priv->lock, flags);
2437 if (cm_id->state != IB_CM_ESTABLISHED) {
2438 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__,
2439 be32_to_cpu(cm_id->local_id), cm_id->state);
2440 ret = -EINVAL;
2441 goto out;
2442 }
2443
2444 if (cm_id->lap_state == IB_CM_LAP_SENT ||
2445 cm_id->lap_state == IB_CM_MRA_LAP_RCVD)
2446 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2447
2448 ret = cm_alloc_msg(cm_id_priv, &msg);
2449 if (ret) {
2450 cm_enter_timewait(cm_id_priv);
2451 goto out;
2452 }
2453
2454 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2455 private_data, private_data_len);
2456 msg->timeout_ms = cm_id_priv->timeout_ms;
2457 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2458
2459 ret = ib_post_send_mad(msg, NULL);
2460 if (ret) {
2461 cm_enter_timewait(cm_id_priv);
2462 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2463 cm_free_msg(msg);
2464 return ret;
2465 }
2466
2467 cm_id->state = IB_CM_DREQ_SENT;
2468 cm_id_priv->msg = msg;
2469out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2470 return ret;
2471}
2472EXPORT_SYMBOL(ib_send_cm_dreq);
2473
2474static void cm_format_drep(struct cm_drep_msg *drep_msg,
2475 struct cm_id_private *cm_id_priv,
2476 const void *private_data,
2477 u8 private_data_len)
2478{
2479 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2480 drep_msg->local_comm_id = cm_id_priv->id.local_id;
2481 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
2482
2483 if (private_data && private_data_len)
2484 memcpy(drep_msg->private_data, private_data, private_data_len);
2485}
2486
2487int ib_send_cm_drep(struct ib_cm_id *cm_id,
2488 const void *private_data,
2489 u8 private_data_len)
2490{
2491 struct cm_id_private *cm_id_priv;
2492 struct ib_mad_send_buf *msg;
2493 unsigned long flags;
2494 void *data;
2495 int ret;
2496
2497 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2498 return -EINVAL;
2499
2500 data = cm_copy_private_data(private_data, private_data_len);
2501 if (IS_ERR(data))
2502 return PTR_ERR(data);
2503
2504 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2505 spin_lock_irqsave(&cm_id_priv->lock, flags);
2506 if (cm_id->state != IB_CM_DREQ_RCVD) {
2507 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2508 kfree(data);
2509 pr_debug("%s: local_id %d, cm_idcm_id->state(%d) != IB_CM_DREQ_RCVD\n",
2510 __func__, be32_to_cpu(cm_id->local_id), cm_id->state);
2511 return -EINVAL;
2512 }
2513
2514 cm_set_private_data(cm_id_priv, data, private_data_len);
2515 cm_enter_timewait(cm_id_priv);
2516
2517 ret = cm_alloc_msg(cm_id_priv, &msg);
2518 if (ret)
2519 goto out;
2520
2521 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2522 private_data, private_data_len);
2523
2524 ret = ib_post_send_mad(msg, NULL);
2525 if (ret) {
2526 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2527 cm_free_msg(msg);
2528 return ret;
2529 }
2530
2531out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2532 return ret;
2533}
2534EXPORT_SYMBOL(ib_send_cm_drep);
2535
2536static int cm_issue_drep(struct cm_port *port,
2537 struct ib_mad_recv_wc *mad_recv_wc)
2538{
2539 struct ib_mad_send_buf *msg = NULL;
2540 struct cm_dreq_msg *dreq_msg;
2541 struct cm_drep_msg *drep_msg;
2542 int ret;
2543
2544 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2545 if (ret)
2546 return ret;
2547
2548 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2549 drep_msg = (struct cm_drep_msg *) msg->mad;
2550
2551 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2552 drep_msg->remote_comm_id = dreq_msg->local_comm_id;
2553 drep_msg->local_comm_id = dreq_msg->remote_comm_id;
2554
2555 ret = ib_post_send_mad(msg, NULL);
2556 if (ret)
2557 cm_free_msg(msg);
2558
2559 return ret;
2560}
2561
2562static int cm_dreq_handler(struct cm_work *work)
2563{
2564 struct cm_id_private *cm_id_priv;
2565 struct cm_dreq_msg *dreq_msg;
2566 struct ib_mad_send_buf *msg = NULL;
2567 int ret;
2568
2569 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2570 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
2571 dreq_msg->local_comm_id);
2572 if (!cm_id_priv) {
2573 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2574 counter[CM_DREQ_COUNTER]);
2575 cm_issue_drep(work->port, work->mad_recv_wc);
2576 pr_debug("%s: no cm_id_priv, local_comm_id %d, remote_comm_id %d\n",
2577 __func__, be32_to_cpu(dreq_msg->local_comm_id),
2578 be32_to_cpu(dreq_msg->remote_comm_id));
2579 return -EINVAL;
2580 }
2581
2582 work->cm_event.private_data = &dreq_msg->private_data;
2583
2584 spin_lock_irq(&cm_id_priv->lock);
2585 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
2586 goto unlock;
2587
2588 switch (cm_id_priv->id.state) {
2589 case IB_CM_REP_SENT:
2590 case IB_CM_DREQ_SENT:
2591 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2592 break;
2593 case IB_CM_ESTABLISHED:
2594 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2595 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2596 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2597 break;
2598 case IB_CM_MRA_REP_RCVD:
2599 break;
2600 case IB_CM_TIMEWAIT:
2601 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2602 counter[CM_DREQ_COUNTER]);
2603 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
2604 if (IS_ERR(msg))
2605 goto unlock;
2606
2607 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2608 cm_id_priv->private_data,
2609 cm_id_priv->private_data_len);
2610 spin_unlock_irq(&cm_id_priv->lock);
2611
2612 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
2613 ib_post_send_mad(msg, NULL))
2614 cm_free_msg(msg);
2615 goto deref;
2616 case IB_CM_DREQ_RCVD:
2617 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2618 counter[CM_DREQ_COUNTER]);
2619 goto unlock;
2620 default:
2621 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
2622 __func__, be32_to_cpu(cm_id_priv->id.local_id),
2623 cm_id_priv->id.state);
2624 goto unlock;
2625 }
2626 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2627 cm_id_priv->tid = dreq_msg->hdr.tid;
2628 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2629 if (!ret)
2630 list_add_tail(&work->list, &cm_id_priv->work_list);
2631 spin_unlock_irq(&cm_id_priv->lock);
2632
2633 if (ret)
2634 cm_process_work(cm_id_priv, work);
2635 else
2636 cm_deref_id(cm_id_priv);
2637 return 0;
2638
2639unlock: spin_unlock_irq(&cm_id_priv->lock);
2640deref: cm_deref_id(cm_id_priv);
2641 return -EINVAL;
2642}
2643
2644static int cm_drep_handler(struct cm_work *work)
2645{
2646 struct cm_id_private *cm_id_priv;
2647 struct cm_drep_msg *drep_msg;
2648 int ret;
2649
2650 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2651 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2652 drep_msg->local_comm_id);
2653 if (!cm_id_priv)
2654 return -EINVAL;
2655
2656 work->cm_event.private_data = &drep_msg->private_data;
2657
2658 spin_lock_irq(&cm_id_priv->lock);
2659 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2660 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2661 spin_unlock_irq(&cm_id_priv->lock);
2662 goto out;
2663 }
2664 cm_enter_timewait(cm_id_priv);
2665
2666 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2667 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2668 if (!ret)
2669 list_add_tail(&work->list, &cm_id_priv->work_list);
2670 spin_unlock_irq(&cm_id_priv->lock);
2671
2672 if (ret)
2673 cm_process_work(cm_id_priv, work);
2674 else
2675 cm_deref_id(cm_id_priv);
2676 return 0;
2677out:
2678 cm_deref_id(cm_id_priv);
2679 return -EINVAL;
2680}
2681
2682int ib_send_cm_rej(struct ib_cm_id *cm_id,
2683 enum ib_cm_rej_reason reason,
2684 void *ari,
2685 u8 ari_length,
2686 const void *private_data,
2687 u8 private_data_len)
2688{
2689 struct cm_id_private *cm_id_priv;
2690 struct ib_mad_send_buf *msg;
2691 unsigned long flags;
2692 int ret;
2693
2694 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2695 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2696 return -EINVAL;
2697
2698 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2699
2700 spin_lock_irqsave(&cm_id_priv->lock, flags);
2701 switch (cm_id->state) {
2702 case IB_CM_REQ_SENT:
2703 case IB_CM_MRA_REQ_RCVD:
2704 case IB_CM_REQ_RCVD:
2705 case IB_CM_MRA_REQ_SENT:
2706 case IB_CM_REP_RCVD:
2707 case IB_CM_MRA_REP_SENT:
2708 ret = cm_alloc_msg(cm_id_priv, &msg);
2709 if (!ret)
2710 cm_format_rej((struct cm_rej_msg *) msg->mad,
2711 cm_id_priv, reason, ari, ari_length,
2712 private_data, private_data_len);
2713
2714 cm_reset_to_idle(cm_id_priv);
2715 break;
2716 case IB_CM_REP_SENT:
2717 case IB_CM_MRA_REP_RCVD:
2718 ret = cm_alloc_msg(cm_id_priv, &msg);
2719 if (!ret)
2720 cm_format_rej((struct cm_rej_msg *) msg->mad,
2721 cm_id_priv, reason, ari, ari_length,
2722 private_data, private_data_len);
2723
2724 cm_enter_timewait(cm_id_priv);
2725 break;
2726 default:
2727 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__,
2728 be32_to_cpu(cm_id_priv->id.local_id), cm_id->state);
2729 ret = -EINVAL;
2730 goto out;
2731 }
2732
2733 if (ret)
2734 goto out;
2735
2736 ret = ib_post_send_mad(msg, NULL);
2737 if (ret)
2738 cm_free_msg(msg);
2739
2740out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2741 return ret;
2742}
2743EXPORT_SYMBOL(ib_send_cm_rej);
2744
2745static void cm_format_rej_event(struct cm_work *work)
2746{
2747 struct cm_rej_msg *rej_msg;
2748 struct ib_cm_rej_event_param *param;
2749
2750 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2751 param = &work->cm_event.param.rej_rcvd;
2752 param->ari = rej_msg->ari;
2753 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2754 param->reason = __be16_to_cpu(rej_msg->reason);
2755 work->cm_event.private_data = &rej_msg->private_data;
2756}
2757
2758static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2759{
2760 struct cm_timewait_info *timewait_info;
2761 struct cm_id_private *cm_id_priv;
2762 __be32 remote_id;
2763
2764 remote_id = rej_msg->local_comm_id;
2765
2766 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2767 spin_lock_irq(&cm.lock);
2768 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2769 remote_id);
2770 if (!timewait_info) {
2771 spin_unlock_irq(&cm.lock);
2772 return NULL;
2773 }
2774 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2775 (timewait_info->work.local_id ^
2776 cm.random_id_operand));
2777 if (cm_id_priv) {
2778 if (cm_id_priv->id.remote_id == remote_id)
2779 atomic_inc(&cm_id_priv->refcount);
2780 else
2781 cm_id_priv = NULL;
2782 }
2783 spin_unlock_irq(&cm.lock);
2784 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2785 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2786 else
2787 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2788
2789 return cm_id_priv;
2790}
2791
2792static int cm_rej_handler(struct cm_work *work)
2793{
2794 struct cm_id_private *cm_id_priv;
2795 struct cm_rej_msg *rej_msg;
2796 int ret;
2797
2798 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2799 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2800 if (!cm_id_priv)
2801 return -EINVAL;
2802
2803 cm_format_rej_event(work);
2804
2805 spin_lock_irq(&cm_id_priv->lock);
2806 switch (cm_id_priv->id.state) {
2807 case IB_CM_REQ_SENT:
2808 case IB_CM_MRA_REQ_RCVD:
2809 case IB_CM_REP_SENT:
2810 case IB_CM_MRA_REP_RCVD:
2811 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2812 /* fall through */
2813 case IB_CM_REQ_RCVD:
2814 case IB_CM_MRA_REQ_SENT:
2815 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2816 cm_enter_timewait(cm_id_priv);
2817 else
2818 cm_reset_to_idle(cm_id_priv);
2819 break;
2820 case IB_CM_DREQ_SENT:
2821 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2822 /* fall through */
2823 case IB_CM_REP_RCVD:
2824 case IB_CM_MRA_REP_SENT:
2825 cm_enter_timewait(cm_id_priv);
2826 break;
2827 case IB_CM_ESTABLISHED:
2828 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
2829 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
2830 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
2831 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2832 cm_id_priv->msg);
2833 cm_enter_timewait(cm_id_priv);
2834 break;
2835 }
2836 /* fall through */
2837 default:
2838 spin_unlock_irq(&cm_id_priv->lock);
2839 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
2840 __func__, be32_to_cpu(cm_id_priv->id.local_id),
2841 cm_id_priv->id.state);
2842 ret = -EINVAL;
2843 goto out;
2844 }
2845
2846 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2847 if (!ret)
2848 list_add_tail(&work->list, &cm_id_priv->work_list);
2849 spin_unlock_irq(&cm_id_priv->lock);
2850
2851 if (ret)
2852 cm_process_work(cm_id_priv, work);
2853 else
2854 cm_deref_id(cm_id_priv);
2855 return 0;
2856out:
2857 cm_deref_id(cm_id_priv);
2858 return -EINVAL;
2859}
2860
2861int ib_send_cm_mra(struct ib_cm_id *cm_id,
2862 u8 service_timeout,
2863 const void *private_data,
2864 u8 private_data_len)
2865{
2866 struct cm_id_private *cm_id_priv;
2867 struct ib_mad_send_buf *msg;
2868 enum ib_cm_state cm_state;
2869 enum ib_cm_lap_state lap_state;
2870 enum cm_msg_response msg_response;
2871 void *data;
2872 unsigned long flags;
2873 int ret;
2874
2875 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2876 return -EINVAL;
2877
2878 data = cm_copy_private_data(private_data, private_data_len);
2879 if (IS_ERR(data))
2880 return PTR_ERR(data);
2881
2882 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2883
2884 spin_lock_irqsave(&cm_id_priv->lock, flags);
2885 switch(cm_id_priv->id.state) {
2886 case IB_CM_REQ_RCVD:
2887 cm_state = IB_CM_MRA_REQ_SENT;
2888 lap_state = cm_id->lap_state;
2889 msg_response = CM_MSG_RESPONSE_REQ;
2890 break;
2891 case IB_CM_REP_RCVD:
2892 cm_state = IB_CM_MRA_REP_SENT;
2893 lap_state = cm_id->lap_state;
2894 msg_response = CM_MSG_RESPONSE_REP;
2895 break;
2896 case IB_CM_ESTABLISHED:
2897 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
2898 cm_state = cm_id->state;
2899 lap_state = IB_CM_MRA_LAP_SENT;
2900 msg_response = CM_MSG_RESPONSE_OTHER;
2901 break;
2902 }
2903 /* fall through */
2904 default:
2905 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
2906 __func__, be32_to_cpu(cm_id_priv->id.local_id),
2907 cm_id_priv->id.state);
2908 ret = -EINVAL;
2909 goto error1;
2910 }
2911
2912 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
2913 ret = cm_alloc_msg(cm_id_priv, &msg);
2914 if (ret)
2915 goto error1;
2916
2917 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2918 msg_response, service_timeout,
2919 private_data, private_data_len);
2920 ret = ib_post_send_mad(msg, NULL);
2921 if (ret)
2922 goto error2;
2923 }
2924
2925 cm_id->state = cm_state;
2926 cm_id->lap_state = lap_state;
2927 cm_id_priv->service_timeout = service_timeout;
2928 cm_set_private_data(cm_id_priv, data, private_data_len);
2929 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2930 return 0;
2931
2932error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2933 kfree(data);
2934 return ret;
2935
2936error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2937 kfree(data);
2938 cm_free_msg(msg);
2939 return ret;
2940}
2941EXPORT_SYMBOL(ib_send_cm_mra);
2942
2943static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2944{
2945 switch (cm_mra_get_msg_mraed(mra_msg)) {
2946 case CM_MSG_RESPONSE_REQ:
2947 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2948 case CM_MSG_RESPONSE_REP:
2949 case CM_MSG_RESPONSE_OTHER:
2950 return cm_acquire_id(mra_msg->remote_comm_id,
2951 mra_msg->local_comm_id);
2952 default:
2953 return NULL;
2954 }
2955}
2956
2957static int cm_mra_handler(struct cm_work *work)
2958{
2959 struct cm_id_private *cm_id_priv;
2960 struct cm_mra_msg *mra_msg;
2961 int timeout, ret;
2962
2963 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2964 cm_id_priv = cm_acquire_mraed_id(mra_msg);
2965 if (!cm_id_priv)
2966 return -EINVAL;
2967
2968 work->cm_event.private_data = &mra_msg->private_data;
2969 work->cm_event.param.mra_rcvd.service_timeout =
2970 cm_mra_get_service_timeout(mra_msg);
2971 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2972 cm_convert_to_ms(cm_id_priv->av.timeout);
2973
2974 spin_lock_irq(&cm_id_priv->lock);
2975 switch (cm_id_priv->id.state) {
2976 case IB_CM_REQ_SENT:
2977 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2978 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2979 cm_id_priv->msg, timeout))
2980 goto out;
2981 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2982 break;
2983 case IB_CM_REP_SENT:
2984 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2985 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2986 cm_id_priv->msg, timeout))
2987 goto out;
2988 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2989 break;
2990 case IB_CM_ESTABLISHED:
2991 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2992 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2993 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2994 cm_id_priv->msg, timeout)) {
2995 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2996 atomic_long_inc(&work->port->
2997 counter_group[CM_RECV_DUPLICATES].
2998 counter[CM_MRA_COUNTER]);
2999 goto out;
3000 }
3001 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
3002 break;
3003 case IB_CM_MRA_REQ_RCVD:
3004 case IB_CM_MRA_REP_RCVD:
3005 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3006 counter[CM_MRA_COUNTER]);
3007 /* fall through */
3008 default:
3009 pr_debug("%s local_id %d, cm_id_priv->id.state: %d\n",
3010 __func__, be32_to_cpu(cm_id_priv->id.local_id),
3011 cm_id_priv->id.state);
3012 goto out;
3013 }
3014
3015 cm_id_priv->msg->context[1] = (void *) (unsigned long)
3016 cm_id_priv->id.state;
3017 ret = atomic_inc_and_test(&cm_id_priv->work_count);
3018 if (!ret)
3019 list_add_tail(&work->list, &cm_id_priv->work_list);
3020 spin_unlock_irq(&cm_id_priv->lock);
3021
3022 if (ret)
3023 cm_process_work(cm_id_priv, work);
3024 else
3025 cm_deref_id(cm_id_priv);
3026 return 0;
3027out:
3028 spin_unlock_irq(&cm_id_priv->lock);
3029 cm_deref_id(cm_id_priv);
3030 return -EINVAL;
3031}
3032
3033static void cm_format_lap(struct cm_lap_msg *lap_msg,
3034 struct cm_id_private *cm_id_priv,
3035 struct sa_path_rec *alternate_path,
3036 const void *private_data,
3037 u8 private_data_len)
3038{
3039 bool alt_ext = false;
3040
3041 if (alternate_path->rec_type == SA_PATH_REC_TYPE_OPA)
3042 alt_ext = opa_is_extended_lid(alternate_path->opa.dlid,
3043 alternate_path->opa.slid);
3044 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
3045 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
3046 lap_msg->local_comm_id = cm_id_priv->id.local_id;
3047 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
3048 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
3049 /* todo: need remote CM response timeout */
3050 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
3051 lap_msg->alt_local_lid =
3052 htons(ntohl(sa_path_get_slid(alternate_path)));
3053 lap_msg->alt_remote_lid =
3054 htons(ntohl(sa_path_get_dlid(alternate_path)));
3055 lap_msg->alt_local_gid = alternate_path->sgid;
3056 lap_msg->alt_remote_gid = alternate_path->dgid;
3057 if (alt_ext) {
3058 lap_msg->alt_local_gid.global.interface_id
3059 = OPA_MAKE_ID(be32_to_cpu(alternate_path->opa.slid));
3060 lap_msg->alt_remote_gid.global.interface_id
3061 = OPA_MAKE_ID(be32_to_cpu(alternate_path->opa.dlid));
3062 }
3063 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
3064 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
3065 lap_msg->alt_hop_limit = alternate_path->hop_limit;
3066 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
3067 cm_lap_set_sl(lap_msg, alternate_path->sl);
3068 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
3069 cm_lap_set_local_ack_timeout(lap_msg,
3070 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
3071 alternate_path->packet_life_time));
3072
3073 if (private_data && private_data_len)
3074 memcpy(lap_msg->private_data, private_data, private_data_len);
3075}
3076
3077int ib_send_cm_lap(struct ib_cm_id *cm_id,
3078 struct sa_path_rec *alternate_path,
3079 const void *private_data,
3080 u8 private_data_len)
3081{
3082 struct cm_id_private *cm_id_priv;
3083 struct ib_mad_send_buf *msg;
3084 unsigned long flags;
3085 int ret;
3086
3087 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
3088 return -EINVAL;
3089
3090 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3091 spin_lock_irqsave(&cm_id_priv->lock, flags);
3092 if (cm_id->state != IB_CM_ESTABLISHED ||
3093 (cm_id->lap_state != IB_CM_LAP_UNINIT &&
3094 cm_id->lap_state != IB_CM_LAP_IDLE)) {
3095 ret = -EINVAL;
3096 goto out;
3097 }
3098
3099 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av,
3100 cm_id_priv);
3101 if (ret)
3102 goto out;
3103 cm_id_priv->alt_av.timeout =
3104 cm_ack_timeout(cm_id_priv->target_ack_delay,
3105 cm_id_priv->alt_av.timeout - 1);
3106
3107 ret = cm_alloc_msg(cm_id_priv, &msg);
3108 if (ret)
3109 goto out;
3110
3111 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
3112 alternate_path, private_data, private_data_len);
3113 msg->timeout_ms = cm_id_priv->timeout_ms;
3114 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
3115
3116 ret = ib_post_send_mad(msg, NULL);
3117 if (ret) {
3118 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3119 cm_free_msg(msg);
3120 return ret;
3121 }
3122
3123 cm_id->lap_state = IB_CM_LAP_SENT;
3124 cm_id_priv->msg = msg;
3125
3126out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3127 return ret;
3128}
3129EXPORT_SYMBOL(ib_send_cm_lap);
3130
3131static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg,
3132 struct sa_path_rec *path)
3133{
3134 u32 lid;
3135
3136 if (path->rec_type != SA_PATH_REC_TYPE_OPA) {
3137 sa_path_set_dlid(path, ntohs(lap_msg->alt_local_lid));
3138 sa_path_set_slid(path, ntohs(lap_msg->alt_remote_lid));
3139 } else {
3140 lid = opa_get_lid_from_gid(&lap_msg->alt_local_gid);
3141 sa_path_set_dlid(path, lid);
3142
3143 lid = opa_get_lid_from_gid(&lap_msg->alt_remote_gid);
3144 sa_path_set_slid(path, lid);
3145 }
3146}
3147
3148static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
3149 struct sa_path_rec *path,
3150 struct cm_lap_msg *lap_msg)
3151{
3152 path->dgid = lap_msg->alt_local_gid;
3153 path->sgid = lap_msg->alt_remote_gid;
3154 path->flow_label = cm_lap_get_flow_label(lap_msg);
3155 path->hop_limit = lap_msg->alt_hop_limit;
3156 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
3157 path->reversible = 1;
3158 path->pkey = cm_id_priv->pkey;
3159 path->sl = cm_lap_get_sl(lap_msg);
3160 path->mtu_selector = IB_SA_EQ;
3161 path->mtu = cm_id_priv->path_mtu;
3162 path->rate_selector = IB_SA_EQ;
3163 path->rate = cm_lap_get_packet_rate(lap_msg);
3164 path->packet_life_time_selector = IB_SA_EQ;
3165 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
3166 path->packet_life_time -= (path->packet_life_time > 0);
3167 cm_format_path_lid_from_lap(lap_msg, path);
3168}
3169
3170static int cm_lap_handler(struct cm_work *work)
3171{
3172 struct cm_id_private *cm_id_priv;
3173 struct cm_lap_msg *lap_msg;
3174 struct ib_cm_lap_event_param *param;
3175 struct ib_mad_send_buf *msg = NULL;
3176 int ret;
3177
3178 /* Currently Alternate path messages are not supported for
3179 * RoCE link layer.
3180 */
3181 if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3182 work->port->port_num))
3183 return -EINVAL;
3184
3185 /* todo: verify LAP request and send reject APR if invalid. */
3186 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
3187 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
3188 lap_msg->local_comm_id);
3189 if (!cm_id_priv)
3190 return -EINVAL;
3191
3192 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
3193 work->mad_recv_wc->recv_buf.grh,
3194 &cm_id_priv->av);
3195 if (ret)
3196 goto deref;
3197
3198 param = &work->cm_event.param.lap_rcvd;
3199 memset(&work->path[0], 0, sizeof(work->path[1]));
3200 cm_path_set_rec_type(work->port->cm_dev->ib_device,
3201 work->port->port_num,
3202 &work->path[0],
3203 &lap_msg->alt_local_gid);
3204 param->alternate_path = &work->path[0];
3205 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
3206 work->cm_event.private_data = &lap_msg->private_data;
3207
3208 spin_lock_irq(&cm_id_priv->lock);
3209 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
3210 goto unlock;
3211
3212 switch (cm_id_priv->id.lap_state) {
3213 case IB_CM_LAP_UNINIT:
3214 case IB_CM_LAP_IDLE:
3215 break;
3216 case IB_CM_MRA_LAP_SENT:
3217 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3218 counter[CM_LAP_COUNTER]);
3219 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
3220 if (IS_ERR(msg))
3221 goto unlock;
3222
3223 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
3224 CM_MSG_RESPONSE_OTHER,
3225 cm_id_priv->service_timeout,
3226 cm_id_priv->private_data,
3227 cm_id_priv->private_data_len);
3228 spin_unlock_irq(&cm_id_priv->lock);
3229
3230 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
3231 ib_post_send_mad(msg, NULL))
3232 cm_free_msg(msg);
3233 goto deref;
3234 case IB_CM_LAP_RCVD:
3235 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3236 counter[CM_LAP_COUNTER]);
3237 goto unlock;
3238 default:
3239 goto unlock;
3240 }
3241
3242 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
3243 cm_id_priv->tid = lap_msg->hdr.tid;
3244 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av,
3245 cm_id_priv);
3246 ret = atomic_inc_and_test(&cm_id_priv->work_count);
3247 if (!ret)
3248 list_add_tail(&work->list, &cm_id_priv->work_list);
3249 spin_unlock_irq(&cm_id_priv->lock);
3250
3251 if (ret)
3252 cm_process_work(cm_id_priv, work);
3253 else
3254 cm_deref_id(cm_id_priv);
3255 return 0;
3256
3257unlock: spin_unlock_irq(&cm_id_priv->lock);
3258deref: cm_deref_id(cm_id_priv);
3259 return -EINVAL;
3260}
3261
3262static void cm_format_apr(struct cm_apr_msg *apr_msg,
3263 struct cm_id_private *cm_id_priv,
3264 enum ib_cm_apr_status status,
3265 void *info,
3266 u8 info_length,
3267 const void *private_data,
3268 u8 private_data_len)
3269{
3270 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
3271 apr_msg->local_comm_id = cm_id_priv->id.local_id;
3272 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
3273 apr_msg->ap_status = (u8) status;
3274
3275 if (info && info_length) {
3276 apr_msg->info_length = info_length;
3277 memcpy(apr_msg->info, info, info_length);
3278 }
3279
3280 if (private_data && private_data_len)
3281 memcpy(apr_msg->private_data, private_data, private_data_len);
3282}
3283
3284int ib_send_cm_apr(struct ib_cm_id *cm_id,
3285 enum ib_cm_apr_status status,
3286 void *info,
3287 u8 info_length,
3288 const void *private_data,
3289 u8 private_data_len)
3290{
3291 struct cm_id_private *cm_id_priv;
3292 struct ib_mad_send_buf *msg;
3293 unsigned long flags;
3294 int ret;
3295
3296 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
3297 (info && info_length > IB_CM_APR_INFO_LENGTH))
3298 return -EINVAL;
3299
3300 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3301 spin_lock_irqsave(&cm_id_priv->lock, flags);
3302 if (cm_id->state != IB_CM_ESTABLISHED ||
3303 (cm_id->lap_state != IB_CM_LAP_RCVD &&
3304 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
3305 ret = -EINVAL;
3306 goto out;
3307 }
3308
3309 ret = cm_alloc_msg(cm_id_priv, &msg);
3310 if (ret)
3311 goto out;
3312
3313 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
3314 info, info_length, private_data, private_data_len);
3315 ret = ib_post_send_mad(msg, NULL);
3316 if (ret) {
3317 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3318 cm_free_msg(msg);
3319 return ret;
3320 }
3321
3322 cm_id->lap_state = IB_CM_LAP_IDLE;
3323out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3324 return ret;
3325}
3326EXPORT_SYMBOL(ib_send_cm_apr);
3327
3328static int cm_apr_handler(struct cm_work *work)
3329{
3330 struct cm_id_private *cm_id_priv;
3331 struct cm_apr_msg *apr_msg;
3332 int ret;
3333
3334 /* Currently Alternate path messages are not supported for
3335 * RoCE link layer.
3336 */
3337 if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3338 work->port->port_num))
3339 return -EINVAL;
3340
3341 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
3342 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
3343 apr_msg->local_comm_id);
3344 if (!cm_id_priv)
3345 return -EINVAL; /* Unmatched reply. */
3346
3347 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
3348 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
3349 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
3350 work->cm_event.private_data = &apr_msg->private_data;
3351
3352 spin_lock_irq(&cm_id_priv->lock);
3353 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
3354 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
3355 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
3356 spin_unlock_irq(&cm_id_priv->lock);
3357 goto out;
3358 }
3359 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
3360 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3361 cm_id_priv->msg = NULL;
3362
3363 ret = atomic_inc_and_test(&cm_id_priv->work_count);
3364 if (!ret)
3365 list_add_tail(&work->list, &cm_id_priv->work_list);
3366 spin_unlock_irq(&cm_id_priv->lock);
3367
3368 if (ret)
3369 cm_process_work(cm_id_priv, work);
3370 else
3371 cm_deref_id(cm_id_priv);
3372 return 0;
3373out:
3374 cm_deref_id(cm_id_priv);
3375 return -EINVAL;
3376}
3377
3378static int cm_timewait_handler(struct cm_work *work)
3379{
3380 struct cm_timewait_info *timewait_info;
3381 struct cm_id_private *cm_id_priv;
3382 int ret;
3383
3384 timewait_info = (struct cm_timewait_info *)work;
3385 spin_lock_irq(&cm.lock);
3386 list_del(&timewait_info->list);
3387 spin_unlock_irq(&cm.lock);
3388
3389 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
3390 timewait_info->work.remote_id);
3391 if (!cm_id_priv)
3392 return -EINVAL;
3393
3394 spin_lock_irq(&cm_id_priv->lock);
3395 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
3396 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
3397 spin_unlock_irq(&cm_id_priv->lock);
3398 goto out;
3399 }
3400 cm_id_priv->id.state = IB_CM_IDLE;
3401 ret = atomic_inc_and_test(&cm_id_priv->work_count);
3402 if (!ret)
3403 list_add_tail(&work->list, &cm_id_priv->work_list);
3404 spin_unlock_irq(&cm_id_priv->lock);
3405
3406 if (ret)
3407 cm_process_work(cm_id_priv, work);
3408 else
3409 cm_deref_id(cm_id_priv);
3410 return 0;
3411out:
3412 cm_deref_id(cm_id_priv);
3413 return -EINVAL;
3414}
3415
3416static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
3417 struct cm_id_private *cm_id_priv,
3418 struct ib_cm_sidr_req_param *param)
3419{
3420 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
3421 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
3422 sidr_req_msg->request_id = cm_id_priv->id.local_id;
3423 sidr_req_msg->pkey = param->path->pkey;
3424 sidr_req_msg->service_id = param->service_id;
3425
3426 if (param->private_data && param->private_data_len)
3427 memcpy(sidr_req_msg->private_data, param->private_data,
3428 param->private_data_len);
3429}
3430
3431int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
3432 struct ib_cm_sidr_req_param *param)
3433{
3434 struct cm_id_private *cm_id_priv;
3435 struct ib_mad_send_buf *msg;
3436 unsigned long flags;
3437 int ret;
3438
3439 if (!param->path || (param->private_data &&
3440 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
3441 return -EINVAL;
3442
3443 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3444 ret = cm_init_av_by_path(param->path, &cm_id_priv->av, cm_id_priv);
3445 if (ret)
3446 goto out;
3447
3448 cm_id->service_id = param->service_id;
3449 cm_id->service_mask = ~cpu_to_be64(0);
3450 cm_id_priv->timeout_ms = param->timeout_ms;
3451 cm_id_priv->max_cm_retries = param->max_cm_retries;
3452 ret = cm_alloc_msg(cm_id_priv, &msg);
3453 if (ret)
3454 goto out;
3455
3456 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
3457 param);
3458 msg->timeout_ms = cm_id_priv->timeout_ms;
3459 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
3460
3461 spin_lock_irqsave(&cm_id_priv->lock, flags);
3462 if (cm_id->state == IB_CM_IDLE)
3463 ret = ib_post_send_mad(msg, NULL);
3464 else
3465 ret = -EINVAL;
3466
3467 if (ret) {
3468 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3469 cm_free_msg(msg);
3470 goto out;
3471 }
3472 cm_id->state = IB_CM_SIDR_REQ_SENT;
3473 cm_id_priv->msg = msg;
3474 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3475out:
3476 return ret;
3477}
3478EXPORT_SYMBOL(ib_send_cm_sidr_req);
3479
3480static void cm_format_sidr_req_event(struct cm_work *work,
3481 struct ib_cm_id *listen_id)
3482{
3483 struct cm_sidr_req_msg *sidr_req_msg;
3484 struct ib_cm_sidr_req_event_param *param;
3485
3486 sidr_req_msg = (struct cm_sidr_req_msg *)
3487 work->mad_recv_wc->recv_buf.mad;
3488 param = &work->cm_event.param.sidr_req_rcvd;
3489 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
3490 param->listen_id = listen_id;
3491 param->service_id = sidr_req_msg->service_id;
3492 param->bth_pkey = cm_get_bth_pkey(work);
3493 param->port = work->port->port_num;
3494 work->cm_event.private_data = &sidr_req_msg->private_data;
3495}
3496
3497static int cm_sidr_req_handler(struct cm_work *work)
3498{
3499 struct ib_cm_id *cm_id;
3500 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
3501 struct cm_sidr_req_msg *sidr_req_msg;
3502 struct ib_wc *wc;
3503 int ret;
3504
3505 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
3506 if (IS_ERR(cm_id))
3507 return PTR_ERR(cm_id);
3508 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3509
3510 /* Record SGID/SLID and request ID for lookup. */
3511 sidr_req_msg = (struct cm_sidr_req_msg *)
3512 work->mad_recv_wc->recv_buf.mad;
3513 wc = work->mad_recv_wc->wc;
3514 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
3515 cm_id_priv->av.dgid.global.interface_id = 0;
3516 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
3517 work->mad_recv_wc->recv_buf.grh,
3518 &cm_id_priv->av);
3519 if (ret)
3520 goto out;
3521
3522 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
3523 cm_id_priv->tid = sidr_req_msg->hdr.tid;
3524 atomic_inc(&cm_id_priv->work_count);
3525
3526 spin_lock_irq(&cm.lock);
3527 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3528 if (cur_cm_id_priv) {
3529 spin_unlock_irq(&cm.lock);
3530 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3531 counter[CM_SIDR_REQ_COUNTER]);
3532 goto out; /* Duplicate message. */
3533 }
3534 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3535 cur_cm_id_priv = cm_find_listen(cm_id->device,
3536 sidr_req_msg->service_id);
3537 if (!cur_cm_id_priv) {
3538 spin_unlock_irq(&cm.lock);
3539 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED);
3540 goto out; /* No match. */
3541 }
3542 atomic_inc(&cur_cm_id_priv->refcount);
3543 atomic_inc(&cm_id_priv->refcount);
3544 spin_unlock_irq(&cm.lock);
3545
3546 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
3547 cm_id_priv->id.context = cur_cm_id_priv->id.context;
3548 cm_id_priv->id.service_id = sidr_req_msg->service_id;
3549 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3550
3551 cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
3552 cm_process_work(cm_id_priv, work);
3553 cm_deref_id(cur_cm_id_priv);
3554 return 0;
3555out:
3556 ib_destroy_cm_id(&cm_id_priv->id);
3557 return -EINVAL;
3558}
3559
3560static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3561 struct cm_id_private *cm_id_priv,
3562 struct ib_cm_sidr_rep_param *param)
3563{
3564 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3565 cm_id_priv->tid);
3566 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
3567 sidr_rep_msg->status = param->status;
3568 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
3569 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
3570 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
3571
3572 if (param->info && param->info_length)
3573 memcpy(sidr_rep_msg->info, param->info, param->info_length);
3574
3575 if (param->private_data && param->private_data_len)
3576 memcpy(sidr_rep_msg->private_data, param->private_data,
3577 param->private_data_len);
3578}
3579
3580int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3581 struct ib_cm_sidr_rep_param *param)
3582{
3583 struct cm_id_private *cm_id_priv;
3584 struct ib_mad_send_buf *msg;
3585 unsigned long flags;
3586 int ret;
3587
3588 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3589 (param->private_data &&
3590 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3591 return -EINVAL;
3592
3593 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3594 spin_lock_irqsave(&cm_id_priv->lock, flags);
3595 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
3596 ret = -EINVAL;
3597 goto error;
3598 }
3599
3600 ret = cm_alloc_msg(cm_id_priv, &msg);
3601 if (ret)
3602 goto error;
3603
3604 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3605 param);
3606 ret = ib_post_send_mad(msg, NULL);
3607 if (ret) {
3608 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3609 cm_free_msg(msg);
3610 return ret;
3611 }
3612 cm_id->state = IB_CM_IDLE;
3613 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3614
3615 spin_lock_irqsave(&cm.lock, flags);
3616 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) {
3617 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3618 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
3619 }
3620 spin_unlock_irqrestore(&cm.lock, flags);
3621 return 0;
3622
3623error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3624 return ret;
3625}
3626EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3627
3628static void cm_format_sidr_rep_event(struct cm_work *work)
3629{
3630 struct cm_sidr_rep_msg *sidr_rep_msg;
3631 struct ib_cm_sidr_rep_event_param *param;
3632
3633 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3634 work->mad_recv_wc->recv_buf.mad;
3635 param = &work->cm_event.param.sidr_rep_rcvd;
3636 param->status = sidr_rep_msg->status;
3637 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
3638 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
3639 param->info = &sidr_rep_msg->info;
3640 param->info_len = sidr_rep_msg->info_length;
3641 work->cm_event.private_data = &sidr_rep_msg->private_data;
3642}
3643
3644static int cm_sidr_rep_handler(struct cm_work *work)
3645{
3646 struct cm_sidr_rep_msg *sidr_rep_msg;
3647 struct cm_id_private *cm_id_priv;
3648
3649 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3650 work->mad_recv_wc->recv_buf.mad;
3651 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
3652 if (!cm_id_priv)
3653 return -EINVAL; /* Unmatched reply. */
3654
3655 spin_lock_irq(&cm_id_priv->lock);
3656 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3657 spin_unlock_irq(&cm_id_priv->lock);
3658 goto out;
3659 }
3660 cm_id_priv->id.state = IB_CM_IDLE;
3661 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3662 spin_unlock_irq(&cm_id_priv->lock);
3663
3664 cm_format_sidr_rep_event(work);
3665 cm_process_work(cm_id_priv, work);
3666 return 0;
3667out:
3668 cm_deref_id(cm_id_priv);
3669 return -EINVAL;
3670}
3671
3672static void cm_process_send_error(struct ib_mad_send_buf *msg,
3673 enum ib_wc_status wc_status)
3674{
3675 struct cm_id_private *cm_id_priv;
3676 struct ib_cm_event cm_event;
3677 enum ib_cm_state state;
3678 int ret;
3679
3680 memset(&cm_event, 0, sizeof cm_event);
3681 cm_id_priv = msg->context[0];
3682
3683 /* Discard old sends or ones without a response. */
3684 spin_lock_irq(&cm_id_priv->lock);
3685 state = (enum ib_cm_state) (unsigned long) msg->context[1];
3686 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3687 goto discard;
3688
3689 pr_debug_ratelimited("CM: failed sending MAD in state %d. (%s)\n",
3690 state, ib_wc_status_msg(wc_status));
3691 switch (state) {
3692 case IB_CM_REQ_SENT:
3693 case IB_CM_MRA_REQ_RCVD:
3694 cm_reset_to_idle(cm_id_priv);
3695 cm_event.event = IB_CM_REQ_ERROR;
3696 break;
3697 case IB_CM_REP_SENT:
3698 case IB_CM_MRA_REP_RCVD:
3699 cm_reset_to_idle(cm_id_priv);
3700 cm_event.event = IB_CM_REP_ERROR;
3701 break;
3702 case IB_CM_DREQ_SENT:
3703 cm_enter_timewait(cm_id_priv);
3704 cm_event.event = IB_CM_DREQ_ERROR;
3705 break;
3706 case IB_CM_SIDR_REQ_SENT:
3707 cm_id_priv->id.state = IB_CM_IDLE;
3708 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3709 break;
3710 default:
3711 goto discard;
3712 }
3713 spin_unlock_irq(&cm_id_priv->lock);
3714 cm_event.param.send_status = wc_status;
3715
3716 /* No other events can occur on the cm_id at this point. */
3717 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3718 cm_free_msg(msg);
3719 if (ret)
3720 ib_destroy_cm_id(&cm_id_priv->id);
3721 return;
3722discard:
3723 spin_unlock_irq(&cm_id_priv->lock);
3724 cm_free_msg(msg);
3725}
3726
3727static void cm_send_handler(struct ib_mad_agent *mad_agent,
3728 struct ib_mad_send_wc *mad_send_wc)
3729{
3730 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3731 struct cm_port *port;
3732 u16 attr_index;
3733
3734 port = mad_agent->context;
3735 attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3736 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3737
3738 /*
3739 * If the send was in response to a received message (context[0] is not
3740 * set to a cm_id), and is not a REJ, then it is a send that was
3741 * manually retried.
3742 */
3743 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3744 msg->retries = 1;
3745
3746 atomic_long_add(1 + msg->retries,
3747 &port->counter_group[CM_XMIT].counter[attr_index]);
3748 if (msg->retries)
3749 atomic_long_add(msg->retries,
3750 &port->counter_group[CM_XMIT_RETRIES].
3751 counter[attr_index]);
3752
3753 switch (mad_send_wc->status) {
3754 case IB_WC_SUCCESS:
3755 case IB_WC_WR_FLUSH_ERR:
3756 cm_free_msg(msg);
3757 break;
3758 default:
3759 if (msg->context[0] && msg->context[1])
3760 cm_process_send_error(msg, mad_send_wc->status);
3761 else
3762 cm_free_msg(msg);
3763 break;
3764 }
3765}
3766
3767static void cm_work_handler(struct work_struct *_work)
3768{
3769 struct cm_work *work = container_of(_work, struct cm_work, work.work);
3770 int ret;
3771
3772 switch (work->cm_event.event) {
3773 case IB_CM_REQ_RECEIVED:
3774 ret = cm_req_handler(work);
3775 break;
3776 case IB_CM_MRA_RECEIVED:
3777 ret = cm_mra_handler(work);
3778 break;
3779 case IB_CM_REJ_RECEIVED:
3780 ret = cm_rej_handler(work);
3781 break;
3782 case IB_CM_REP_RECEIVED:
3783 ret = cm_rep_handler(work);
3784 break;
3785 case IB_CM_RTU_RECEIVED:
3786 ret = cm_rtu_handler(work);
3787 break;
3788 case IB_CM_USER_ESTABLISHED:
3789 ret = cm_establish_handler(work);
3790 break;
3791 case IB_CM_DREQ_RECEIVED:
3792 ret = cm_dreq_handler(work);
3793 break;
3794 case IB_CM_DREP_RECEIVED:
3795 ret = cm_drep_handler(work);
3796 break;
3797 case IB_CM_SIDR_REQ_RECEIVED:
3798 ret = cm_sidr_req_handler(work);
3799 break;
3800 case IB_CM_SIDR_REP_RECEIVED:
3801 ret = cm_sidr_rep_handler(work);
3802 break;
3803 case IB_CM_LAP_RECEIVED:
3804 ret = cm_lap_handler(work);
3805 break;
3806 case IB_CM_APR_RECEIVED:
3807 ret = cm_apr_handler(work);
3808 break;
3809 case IB_CM_TIMEWAIT_EXIT:
3810 ret = cm_timewait_handler(work);
3811 break;
3812 default:
3813 pr_debug("cm_event.event: 0x%x\n", work->cm_event.event);
3814 ret = -EINVAL;
3815 break;
3816 }
3817 if (ret)
3818 cm_free_work(work);
3819}
3820
3821static int cm_establish(struct ib_cm_id *cm_id)
3822{
3823 struct cm_id_private *cm_id_priv;
3824 struct cm_work *work;
3825 unsigned long flags;
3826 int ret = 0;
3827 struct cm_device *cm_dev;
3828
3829 cm_dev = ib_get_client_data(cm_id->device, &cm_client);
3830 if (!cm_dev)
3831 return -ENODEV;
3832
3833 work = kmalloc(sizeof *work, GFP_ATOMIC);
3834 if (!work)
3835 return -ENOMEM;
3836
3837 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3838 spin_lock_irqsave(&cm_id_priv->lock, flags);
3839 switch (cm_id->state)
3840 {
3841 case IB_CM_REP_SENT:
3842 case IB_CM_MRA_REP_RCVD:
3843 cm_id->state = IB_CM_ESTABLISHED;
3844 break;
3845 case IB_CM_ESTABLISHED:
3846 ret = -EISCONN;
3847 break;
3848 default:
3849 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__,
3850 be32_to_cpu(cm_id->local_id), cm_id->state);
3851 ret = -EINVAL;
3852 break;
3853 }
3854 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3855
3856 if (ret) {
3857 kfree(work);
3858 goto out;
3859 }
3860
3861 /*
3862 * The CM worker thread may try to destroy the cm_id before it
3863 * can execute this work item. To prevent potential deadlock,
3864 * we need to find the cm_id once we're in the context of the
3865 * worker thread, rather than holding a reference on it.
3866 */
3867 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3868 work->local_id = cm_id->local_id;
3869 work->remote_id = cm_id->remote_id;
3870 work->mad_recv_wc = NULL;
3871 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3872
3873 /* Check if the device started its remove_one */
3874 spin_lock_irqsave(&cm.lock, flags);
3875 if (!cm_dev->going_down) {
3876 queue_delayed_work(cm.wq, &work->work, 0);
3877 } else {
3878 kfree(work);
3879 ret = -ENODEV;
3880 }
3881 spin_unlock_irqrestore(&cm.lock, flags);
3882
3883out:
3884 return ret;
3885}
3886
3887static int cm_migrate(struct ib_cm_id *cm_id)
3888{
3889 struct cm_id_private *cm_id_priv;
3890 struct cm_av tmp_av;
3891 unsigned long flags;
3892 int tmp_send_port_not_ready;
3893 int ret = 0;
3894
3895 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3896 spin_lock_irqsave(&cm_id_priv->lock, flags);
3897 if (cm_id->state == IB_CM_ESTABLISHED &&
3898 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3899 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3900 cm_id->lap_state = IB_CM_LAP_IDLE;
3901 /* Swap address vector */
3902 tmp_av = cm_id_priv->av;
3903 cm_id_priv->av = cm_id_priv->alt_av;
3904 cm_id_priv->alt_av = tmp_av;
3905 /* Swap port send ready state */
3906 tmp_send_port_not_ready = cm_id_priv->prim_send_port_not_ready;
3907 cm_id_priv->prim_send_port_not_ready = cm_id_priv->altr_send_port_not_ready;
3908 cm_id_priv->altr_send_port_not_ready = tmp_send_port_not_ready;
3909 } else
3910 ret = -EINVAL;
3911 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3912
3913 return ret;
3914}
3915
3916int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3917{
3918 int ret;
3919
3920 switch (event) {
3921 case IB_EVENT_COMM_EST:
3922 ret = cm_establish(cm_id);
3923 break;
3924 case IB_EVENT_PATH_MIG:
3925 ret = cm_migrate(cm_id);
3926 break;
3927 default:
3928 ret = -EINVAL;
3929 }
3930 return ret;
3931}
3932EXPORT_SYMBOL(ib_cm_notify);
3933
3934static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3935 struct ib_mad_send_buf *send_buf,
3936 struct ib_mad_recv_wc *mad_recv_wc)
3937{
3938 struct cm_port *port = mad_agent->context;
3939 struct cm_work *work;
3940 enum ib_cm_event_type event;
3941 bool alt_path = false;
3942 u16 attr_id;
3943 int paths = 0;
3944 int going_down = 0;
3945
3946 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3947 case CM_REQ_ATTR_ID:
3948 alt_path = cm_req_has_alt_path((struct cm_req_msg *)
3949 mad_recv_wc->recv_buf.mad);
3950 paths = 1 + (alt_path != 0);
3951 event = IB_CM_REQ_RECEIVED;
3952 break;
3953 case CM_MRA_ATTR_ID:
3954 event = IB_CM_MRA_RECEIVED;
3955 break;
3956 case CM_REJ_ATTR_ID:
3957 event = IB_CM_REJ_RECEIVED;
3958 break;
3959 case CM_REP_ATTR_ID:
3960 event = IB_CM_REP_RECEIVED;
3961 break;
3962 case CM_RTU_ATTR_ID:
3963 event = IB_CM_RTU_RECEIVED;
3964 break;
3965 case CM_DREQ_ATTR_ID:
3966 event = IB_CM_DREQ_RECEIVED;
3967 break;
3968 case CM_DREP_ATTR_ID:
3969 event = IB_CM_DREP_RECEIVED;
3970 break;
3971 case CM_SIDR_REQ_ATTR_ID:
3972 event = IB_CM_SIDR_REQ_RECEIVED;
3973 break;
3974 case CM_SIDR_REP_ATTR_ID:
3975 event = IB_CM_SIDR_REP_RECEIVED;
3976 break;
3977 case CM_LAP_ATTR_ID:
3978 paths = 1;
3979 event = IB_CM_LAP_RECEIVED;
3980 break;
3981 case CM_APR_ATTR_ID:
3982 event = IB_CM_APR_RECEIVED;
3983 break;
3984 default:
3985 ib_free_recv_mad(mad_recv_wc);
3986 return;
3987 }
3988
3989 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
3990 atomic_long_inc(&port->counter_group[CM_RECV].
3991 counter[attr_id - CM_ATTR_ID_OFFSET]);
3992
3993 work = kmalloc(sizeof(*work) + sizeof(struct sa_path_rec) * paths,
3994 GFP_KERNEL);
3995 if (!work) {
3996 ib_free_recv_mad(mad_recv_wc);
3997 return;
3998 }
3999
4000 INIT_DELAYED_WORK(&work->work, cm_work_handler);
4001 work->cm_event.event = event;
4002 work->mad_recv_wc = mad_recv_wc;
4003 work->port = port;
4004
4005 /* Check if the device started its remove_one */
4006 spin_lock_irq(&cm.lock);
4007 if (!port->cm_dev->going_down)
4008 queue_delayed_work(cm.wq, &work->work, 0);
4009 else
4010 going_down = 1;
4011 spin_unlock_irq(&cm.lock);
4012
4013 if (going_down) {
4014 kfree(work);
4015 ib_free_recv_mad(mad_recv_wc);
4016 }
4017}
4018
4019static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
4020 struct ib_qp_attr *qp_attr,
4021 int *qp_attr_mask)
4022{
4023 unsigned long flags;
4024 int ret;
4025
4026 spin_lock_irqsave(&cm_id_priv->lock, flags);
4027 switch (cm_id_priv->id.state) {
4028 case IB_CM_REQ_SENT:
4029 case IB_CM_MRA_REQ_RCVD:
4030 case IB_CM_REQ_RCVD:
4031 case IB_CM_MRA_REQ_SENT:
4032 case IB_CM_REP_RCVD:
4033 case IB_CM_MRA_REP_SENT:
4034 case IB_CM_REP_SENT:
4035 case IB_CM_MRA_REP_RCVD:
4036 case IB_CM_ESTABLISHED:
4037 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
4038 IB_QP_PKEY_INDEX | IB_QP_PORT;
4039 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
4040 if (cm_id_priv->responder_resources)
4041 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
4042 IB_ACCESS_REMOTE_ATOMIC;
4043 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
4044 qp_attr->port_num = cm_id_priv->av.port->port_num;
4045 ret = 0;
4046 break;
4047 default:
4048 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
4049 __func__, be32_to_cpu(cm_id_priv->id.local_id),
4050 cm_id_priv->id.state);
4051 ret = -EINVAL;
4052 break;
4053 }
4054 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4055 return ret;
4056}
4057
4058static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
4059 struct ib_qp_attr *qp_attr,
4060 int *qp_attr_mask)
4061{
4062 unsigned long flags;
4063 int ret;
4064
4065 spin_lock_irqsave(&cm_id_priv->lock, flags);
4066 switch (cm_id_priv->id.state) {
4067 case IB_CM_REQ_RCVD:
4068 case IB_CM_MRA_REQ_SENT:
4069 case IB_CM_REP_RCVD:
4070 case IB_CM_MRA_REP_SENT:
4071 case IB_CM_REP_SENT:
4072 case IB_CM_MRA_REP_RCVD:
4073 case IB_CM_ESTABLISHED:
4074 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
4075 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
4076 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
4077 qp_attr->path_mtu = cm_id_priv->path_mtu;
4078 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
4079 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
4080 if (cm_id_priv->qp_type == IB_QPT_RC ||
4081 cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
4082 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
4083 IB_QP_MIN_RNR_TIMER;
4084 qp_attr->max_dest_rd_atomic =
4085 cm_id_priv->responder_resources;
4086 qp_attr->min_rnr_timer = 0;
4087 }
4088 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) {
4089 *qp_attr_mask |= IB_QP_ALT_PATH;
4090 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
4091 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4092 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4093 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4094 }
4095 ret = 0;
4096 break;
4097 default:
4098 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
4099 __func__, be32_to_cpu(cm_id_priv->id.local_id),
4100 cm_id_priv->id.state);
4101 ret = -EINVAL;
4102 break;
4103 }
4104 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4105 return ret;
4106}
4107
4108static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
4109 struct ib_qp_attr *qp_attr,
4110 int *qp_attr_mask)
4111{
4112 unsigned long flags;
4113 int ret;
4114
4115 spin_lock_irqsave(&cm_id_priv->lock, flags);
4116 switch (cm_id_priv->id.state) {
4117 /* Allow transition to RTS before sending REP */
4118 case IB_CM_REQ_RCVD:
4119 case IB_CM_MRA_REQ_SENT:
4120
4121 case IB_CM_REP_RCVD:
4122 case IB_CM_MRA_REP_SENT:
4123 case IB_CM_REP_SENT:
4124 case IB_CM_MRA_REP_RCVD:
4125 case IB_CM_ESTABLISHED:
4126 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
4127 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
4128 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
4129 switch (cm_id_priv->qp_type) {
4130 case IB_QPT_RC:
4131 case IB_QPT_XRC_INI:
4132 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
4133 IB_QP_MAX_QP_RD_ATOMIC;
4134 qp_attr->retry_cnt = cm_id_priv->retry_count;
4135 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
4136 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
4137 /* fall through */
4138 case IB_QPT_XRC_TGT:
4139 *qp_attr_mask |= IB_QP_TIMEOUT;
4140 qp_attr->timeout = cm_id_priv->av.timeout;
4141 break;
4142 default:
4143 break;
4144 }
4145 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) {
4146 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
4147 qp_attr->path_mig_state = IB_MIG_REARM;
4148 }
4149 } else {
4150 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
4151 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
4152 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4153 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4154 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4155 qp_attr->path_mig_state = IB_MIG_REARM;
4156 }
4157 ret = 0;
4158 break;
4159 default:
4160 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
4161 __func__, be32_to_cpu(cm_id_priv->id.local_id),
4162 cm_id_priv->id.state);
4163 ret = -EINVAL;
4164 break;
4165 }
4166 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4167 return ret;
4168}
4169
4170int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
4171 struct ib_qp_attr *qp_attr,
4172 int *qp_attr_mask)
4173{
4174 struct cm_id_private *cm_id_priv;
4175 int ret;
4176
4177 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
4178 switch (qp_attr->qp_state) {
4179 case IB_QPS_INIT:
4180 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
4181 break;
4182 case IB_QPS_RTR:
4183 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
4184 break;
4185 case IB_QPS_RTS:
4186 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
4187 break;
4188 default:
4189 ret = -EINVAL;
4190 break;
4191 }
4192 return ret;
4193}
4194EXPORT_SYMBOL(ib_cm_init_qp_attr);
4195
4196static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
4197 char *buf)
4198{
4199 struct cm_counter_group *group;
4200 struct cm_counter_attribute *cm_attr;
4201
4202 group = container_of(obj, struct cm_counter_group, obj);
4203 cm_attr = container_of(attr, struct cm_counter_attribute, attr);
4204
4205 return sprintf(buf, "%ld\n",
4206 atomic_long_read(&group->counter[cm_attr->index]));
4207}
4208
4209static const struct sysfs_ops cm_counter_ops = {
4210 .show = cm_show_counter
4211};
4212
4213static struct kobj_type cm_counter_obj_type = {
4214 .sysfs_ops = &cm_counter_ops,
4215 .default_attrs = cm_counter_default_attrs
4216};
4217
4218static void cm_release_port_obj(struct kobject *obj)
4219{
4220 struct cm_port *cm_port;
4221
4222 cm_port = container_of(obj, struct cm_port, port_obj);
4223 kfree(cm_port);
4224}
4225
4226static struct kobj_type cm_port_obj_type = {
4227 .release = cm_release_port_obj
4228};
4229
4230static char *cm_devnode(struct device *dev, umode_t *mode)
4231{
4232 if (mode)
4233 *mode = 0666;
4234 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
4235}
4236
4237struct class cm_class = {
4238 .owner = THIS_MODULE,
4239 .name = "infiniband_cm",
4240 .devnode = cm_devnode,
4241};
4242EXPORT_SYMBOL(cm_class);
4243
4244static int cm_create_port_fs(struct cm_port *port)
4245{
4246 int i, ret;
4247
4248 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type,
4249 &port->cm_dev->device->kobj,
4250 "%d", port->port_num);
4251 if (ret) {
4252 kfree(port);
4253 return ret;
4254 }
4255
4256 for (i = 0; i < CM_COUNTER_GROUPS; i++) {
4257 ret = kobject_init_and_add(&port->counter_group[i].obj,
4258 &cm_counter_obj_type,
4259 &port->port_obj,
4260 "%s", counter_group_names[i]);
4261 if (ret)
4262 goto error;
4263 }
4264
4265 return 0;
4266
4267error:
4268 while (i--)
4269 kobject_put(&port->counter_group[i].obj);
4270 kobject_put(&port->port_obj);
4271 return ret;
4272
4273}
4274
4275static void cm_remove_port_fs(struct cm_port *port)
4276{
4277 int i;
4278
4279 for (i = 0; i < CM_COUNTER_GROUPS; i++)
4280 kobject_put(&port->counter_group[i].obj);
4281
4282 kobject_put(&port->port_obj);
4283}
4284
4285static void cm_add_one(struct ib_device *ib_device)
4286{
4287 struct cm_device *cm_dev;
4288 struct cm_port *port;
4289 struct ib_mad_reg_req reg_req = {
4290 .mgmt_class = IB_MGMT_CLASS_CM,
4291 .mgmt_class_version = IB_CM_CLASS_VERSION,
4292 };
4293 struct ib_port_modify port_modify = {
4294 .set_port_cap_mask = IB_PORT_CM_SUP
4295 };
4296 unsigned long flags;
4297 int ret;
4298 int count = 0;
4299 u8 i;
4300
4301 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) *
4302 ib_device->phys_port_cnt, GFP_KERNEL);
4303 if (!cm_dev)
4304 return;
4305
4306 cm_dev->ib_device = ib_device;
4307 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay;
4308 cm_dev->going_down = 0;
4309 cm_dev->device = device_create(&cm_class, &ib_device->dev,
4310 MKDEV(0, 0), NULL,
4311 "%s", ib_device->name);
4312 if (IS_ERR(cm_dev->device)) {
4313 kfree(cm_dev);
4314 return;
4315 }
4316
4317 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
4318 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
4319 if (!rdma_cap_ib_cm(ib_device, i))
4320 continue;
4321
4322 port = kzalloc(sizeof *port, GFP_KERNEL);
4323 if (!port)
4324 goto error1;
4325
4326 cm_dev->port[i-1] = port;
4327 port->cm_dev = cm_dev;
4328 port->port_num = i;
4329
4330 INIT_LIST_HEAD(&port->cm_priv_prim_list);
4331 INIT_LIST_HEAD(&port->cm_priv_altr_list);
4332
4333 ret = cm_create_port_fs(port);
4334 if (ret)
4335 goto error1;
4336
4337 port->mad_agent = ib_register_mad_agent(ib_device, i,
4338 IB_QPT_GSI,
4339 ®_req,
4340 0,
4341 cm_send_handler,
4342 cm_recv_handler,
4343 port,
4344 0);
4345 if (IS_ERR(port->mad_agent))
4346 goto error2;
4347
4348 ret = ib_modify_port(ib_device, i, 0, &port_modify);
4349 if (ret)
4350 goto error3;
4351
4352 count++;
4353 }
4354
4355 if (!count)
4356 goto free;
4357
4358 ib_set_client_data(ib_device, &cm_client, cm_dev);
4359
4360 write_lock_irqsave(&cm.device_lock, flags);
4361 list_add_tail(&cm_dev->list, &cm.device_list);
4362 write_unlock_irqrestore(&cm.device_lock, flags);
4363 return;
4364
4365error3:
4366 ib_unregister_mad_agent(port->mad_agent);
4367error2:
4368 cm_remove_port_fs(port);
4369error1:
4370 port_modify.set_port_cap_mask = 0;
4371 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
4372 while (--i) {
4373 if (!rdma_cap_ib_cm(ib_device, i))
4374 continue;
4375
4376 port = cm_dev->port[i-1];
4377 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4378 ib_unregister_mad_agent(port->mad_agent);
4379 cm_remove_port_fs(port);
4380 }
4381free:
4382 device_unregister(cm_dev->device);
4383 kfree(cm_dev);
4384}
4385
4386static void cm_remove_one(struct ib_device *ib_device, void *client_data)
4387{
4388 struct cm_device *cm_dev = client_data;
4389 struct cm_port *port;
4390 struct cm_id_private *cm_id_priv;
4391 struct ib_mad_agent *cur_mad_agent;
4392 struct ib_port_modify port_modify = {
4393 .clr_port_cap_mask = IB_PORT_CM_SUP
4394 };
4395 unsigned long flags;
4396 int i;
4397
4398 if (!cm_dev)
4399 return;
4400
4401 write_lock_irqsave(&cm.device_lock, flags);
4402 list_del(&cm_dev->list);
4403 write_unlock_irqrestore(&cm.device_lock, flags);
4404
4405 spin_lock_irq(&cm.lock);
4406 cm_dev->going_down = 1;
4407 spin_unlock_irq(&cm.lock);
4408
4409 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
4410 if (!rdma_cap_ib_cm(ib_device, i))
4411 continue;
4412
4413 port = cm_dev->port[i-1];
4414 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4415 /* Mark all the cm_id's as not valid */
4416 spin_lock_irq(&cm.lock);
4417 list_for_each_entry(cm_id_priv, &port->cm_priv_altr_list, altr_list)
4418 cm_id_priv->altr_send_port_not_ready = 1;
4419 list_for_each_entry(cm_id_priv, &port->cm_priv_prim_list, prim_list)
4420 cm_id_priv->prim_send_port_not_ready = 1;
4421 spin_unlock_irq(&cm.lock);
4422 /*
4423 * We flush the queue here after the going_down set, this
4424 * verify that no new works will be queued in the recv handler,
4425 * after that we can call the unregister_mad_agent
4426 */
4427 flush_workqueue(cm.wq);
4428 spin_lock_irq(&cm.state_lock);
4429 cur_mad_agent = port->mad_agent;
4430 port->mad_agent = NULL;
4431 spin_unlock_irq(&cm.state_lock);
4432 ib_unregister_mad_agent(cur_mad_agent);
4433 cm_remove_port_fs(port);
4434 }
4435
4436 device_unregister(cm_dev->device);
4437 kfree(cm_dev);
4438}
4439
4440static int __init ib_cm_init(void)
4441{
4442 int ret;
4443
4444 memset(&cm, 0, sizeof cm);
4445 INIT_LIST_HEAD(&cm.device_list);
4446 rwlock_init(&cm.device_lock);
4447 spin_lock_init(&cm.lock);
4448 spin_lock_init(&cm.state_lock);
4449 cm.listen_service_table = RB_ROOT;
4450 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
4451 cm.remote_id_table = RB_ROOT;
4452 cm.remote_qp_table = RB_ROOT;
4453 cm.remote_sidr_table = RB_ROOT;
4454 idr_init(&cm.local_id_table);
4455 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
4456 INIT_LIST_HEAD(&cm.timewait_list);
4457
4458 ret = class_register(&cm_class);
4459 if (ret) {
4460 ret = -ENOMEM;
4461 goto error1;
4462 }
4463
4464 cm.wq = alloc_workqueue("ib_cm", 0, 1);
4465 if (!cm.wq) {
4466 ret = -ENOMEM;
4467 goto error2;
4468 }
4469
4470 ret = ib_register_client(&cm_client);
4471 if (ret)
4472 goto error3;
4473
4474 return 0;
4475error3:
4476 destroy_workqueue(cm.wq);
4477error2:
4478 class_unregister(&cm_class);
4479error1:
4480 idr_destroy(&cm.local_id_table);
4481 return ret;
4482}
4483
4484static void __exit ib_cm_cleanup(void)
4485{
4486 struct cm_timewait_info *timewait_info, *tmp;
4487
4488 spin_lock_irq(&cm.lock);
4489 list_for_each_entry(timewait_info, &cm.timewait_list, list)
4490 cancel_delayed_work(&timewait_info->work.work);
4491 spin_unlock_irq(&cm.lock);
4492
4493 ib_unregister_client(&cm_client);
4494 destroy_workqueue(cm.wq);
4495
4496 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
4497 list_del(&timewait_info->list);
4498 kfree(timewait_info);
4499 }
4500
4501 class_unregister(&cm_class);
4502 idr_destroy(&cm.local_id_table);
4503}
4504
4505module_init(ib_cm_init);
4506module_exit(ib_cm_cleanup);
4507