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