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