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[S390] qdio: make qdio statistics SMP-capable
[linux-2.6/btrfs-unstable.git] / drivers / infiniband / core / cm.c
blob842cd0b53e91a1b3b8d957ec78e803939b2b01b9
1 /*
2 * Copyright (c) 2004-2006 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 * $Id: cm.c 4311 2005-12-05 18:42:01Z sean.hefty $
36 */
37
38 #include <linux/completion.h>
39 #include <linux/dma-mapping.h>
40 #include <linux/err.h>
41 #include <linux/idr.h>
42 #include <linux/interrupt.h>
43 #include <linux/pci.h>
44 #include <linux/random.h>
45 #include <linux/rbtree.h>
46 #include <linux/spinlock.h>
47 #include <linux/workqueue.h>
48
49 #include <rdma/ib_cache.h>
50 #include <rdma/ib_cm.h>
51 #include "cm_msgs.h"
52
53 MODULE_AUTHOR("Sean Hefty");
54 MODULE_DESCRIPTION("InfiniBand CM");
55 MODULE_LICENSE("Dual BSD/GPL");
56
57 static void cm_add_one(struct ib_device *device);
58 static void cm_remove_one(struct ib_device *device);
59
60 static struct ib_client cm_client = {
61 .name = "cm",
62 .add = cm_add_one,
63 .remove = cm_remove_one
64 };
65
66 static struct ib_cm {
67 spinlock_t lock;
68 struct list_head device_list;
69 rwlock_t device_lock;
70 struct rb_root listen_service_table;
71 u64 listen_service_id;
72 /* struct rb_root peer_service_table; todo: fix peer to peer */
73 struct rb_root remote_qp_table;
74 struct rb_root remote_id_table;
75 struct rb_root remote_sidr_table;
76 struct idr local_id_table;
77 __be32 random_id_operand;
78 struct list_head timewait_list;
79 struct workqueue_struct *wq;
80 } cm;
81
82 struct cm_port {
83 struct cm_device *cm_dev;
84 struct ib_mad_agent *mad_agent;
85 u8 port_num;
86 };
87
88 struct cm_device {
89 struct list_head list;
90 struct ib_device *device;
91 struct cm_port port[0];
92 };
93
94 struct cm_av {
95 struct cm_port *port;
96 union ib_gid dgid;
97 struct ib_ah_attr ah_attr;
98 u16 pkey_index;
99 u8 packet_life_time;
100 };
101
102 struct cm_work {
103 struct delayed_work work;
104 struct list_head list;
105 struct cm_port *port;
106 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
107 __be32 local_id; /* Established / timewait */
108 __be32 remote_id;
109 struct ib_cm_event cm_event;
110 struct ib_sa_path_rec path[0];
111 };
112
113 struct cm_timewait_info {
114 struct cm_work work; /* Must be first. */
115 struct list_head list;
116 struct rb_node remote_qp_node;
117 struct rb_node remote_id_node;
118 __be64 remote_ca_guid;
119 __be32 remote_qpn;
120 u8 inserted_remote_qp;
121 u8 inserted_remote_id;
122 };
123
124 struct cm_id_private {
125 struct ib_cm_id id;
126
127 struct rb_node service_node;
128 struct rb_node sidr_id_node;
129 spinlock_t lock; /* Do not acquire inside cm.lock */
130 struct completion comp;
131 atomic_t refcount;
132
133 struct ib_mad_send_buf *msg;
134 struct cm_timewait_info *timewait_info;
135 /* todo: use alternate port on send failure */
136 struct cm_av av;
137 struct cm_av alt_av;
138 struct ib_cm_compare_data *compare_data;
139
140 void *private_data;
141 __be64 tid;
142 __be32 local_qpn;
143 __be32 remote_qpn;
144 enum ib_qp_type qp_type;
145 __be32 sq_psn;
146 __be32 rq_psn;
147 int timeout_ms;
148 enum ib_mtu path_mtu;
149 __be16 pkey;
150 u8 private_data_len;
151 u8 max_cm_retries;
152 u8 peer_to_peer;
153 u8 responder_resources;
154 u8 initiator_depth;
155 u8 retry_count;
156 u8 rnr_retry_count;
157 u8 service_timeout;
158
159 struct list_head work_list;
160 atomic_t work_count;
161 };
162
163 static void cm_work_handler(struct work_struct *work);
164
165 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
166 {
167 if (atomic_dec_and_test(&cm_id_priv->refcount))
168 complete(&cm_id_priv->comp);
169 }
170
171 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
172 struct ib_mad_send_buf **msg)
173 {
174 struct ib_mad_agent *mad_agent;
175 struct ib_mad_send_buf *m;
176 struct ib_ah *ah;
177
178 mad_agent = cm_id_priv->av.port->mad_agent;
179 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
180 if (IS_ERR(ah))
181 return PTR_ERR(ah);
182
183 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
184 cm_id_priv->av.pkey_index,
185 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
186 GFP_ATOMIC);
187 if (IS_ERR(m)) {
188 ib_destroy_ah(ah);
189 return PTR_ERR(m);
190 }
191
192 /* Timeout set by caller if response is expected. */
193 m->ah = ah;
194 m->retries = cm_id_priv->max_cm_retries;
195
196 atomic_inc(&cm_id_priv->refcount);
197 m->context[0] = cm_id_priv;
198 *msg = m;
199 return 0;
200 }
201
202 static int cm_alloc_response_msg(struct cm_port *port,
203 struct ib_mad_recv_wc *mad_recv_wc,
204 struct ib_mad_send_buf **msg)
205 {
206 struct ib_mad_send_buf *m;
207 struct ib_ah *ah;
208
209 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
210 mad_recv_wc->recv_buf.grh, port->port_num);
211 if (IS_ERR(ah))
212 return PTR_ERR(ah);
213
214 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
215 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
216 GFP_ATOMIC);
217 if (IS_ERR(m)) {
218 ib_destroy_ah(ah);
219 return PTR_ERR(m);
220 }
221 m->ah = ah;
222 *msg = m;
223 return 0;
224 }
225
226 static void cm_free_msg(struct ib_mad_send_buf *msg)
227 {
228 ib_destroy_ah(msg->ah);
229 if (msg->context[0])
230 cm_deref_id(msg->context[0]);
231 ib_free_send_mad(msg);
232 }
233
234 static void * cm_copy_private_data(const void *private_data,
235 u8 private_data_len)
236 {
237 void *data;
238
239 if (!private_data || !private_data_len)
240 return NULL;
241
242 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
243 if (!data)
244 return ERR_PTR(-ENOMEM);
245
246 return data;
247 }
248
249 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
250 void *private_data, u8 private_data_len)
251 {
252 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
253 kfree(cm_id_priv->private_data);
254
255 cm_id_priv->private_data = private_data;
256 cm_id_priv->private_data_len = private_data_len;
257 }
258
259 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
260 struct ib_grh *grh, struct cm_av *av)
261 {
262 av->port = port;
263 av->pkey_index = wc->pkey_index;
264 ib_init_ah_from_wc(port->cm_dev->device, port->port_num, wc,
265 grh, &av->ah_attr);
266 }
267
268 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
269 {
270 struct cm_device *cm_dev;
271 struct cm_port *port = NULL;
272 unsigned long flags;
273 int ret;
274 u8 p;
275
276 read_lock_irqsave(&cm.device_lock, flags);
277 list_for_each_entry(cm_dev, &cm.device_list, list) {
278 if (!ib_find_cached_gid(cm_dev->device, &path->sgid,
279 &p, NULL)) {
280 port = &cm_dev->port[p-1];
281 break;
282 }
283 }
284 read_unlock_irqrestore(&cm.device_lock, flags);
285
286 if (!port)
287 return -EINVAL;
288
289 ret = ib_find_cached_pkey(cm_dev->device, port->port_num,
290 be16_to_cpu(path->pkey), &av->pkey_index);
291 if (ret)
292 return ret;
293
294 av->port = port;
295 ib_init_ah_from_path(cm_dev->device, port->port_num, path,
296 &av->ah_attr);
297 av->packet_life_time = path->packet_life_time;
298 return 0;
299 }
300
301 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
302 {
303 unsigned long flags;
304 int ret, id;
305 static int next_id;
306
307 do {
308 spin_lock_irqsave(&cm.lock, flags);
309 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv,
310 next_id++, &id);
311 spin_unlock_irqrestore(&cm.lock, flags);
312 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
313
314 cm_id_priv->id.local_id = (__force __be32) (id ^ cm.random_id_operand);
315 return ret;
316 }
317
318 static void cm_free_id(__be32 local_id)
319 {
320 unsigned long flags;
321
322 spin_lock_irqsave(&cm.lock, flags);
323 idr_remove(&cm.local_id_table,
324 (__force int) (local_id ^ cm.random_id_operand));
325 spin_unlock_irqrestore(&cm.lock, flags);
326 }
327
328 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
329 {
330 struct cm_id_private *cm_id_priv;
331
332 cm_id_priv = idr_find(&cm.local_id_table,
333 (__force int) (local_id ^ cm.random_id_operand));
334 if (cm_id_priv) {
335 if (cm_id_priv->id.remote_id == remote_id)
336 atomic_inc(&cm_id_priv->refcount);
337 else
338 cm_id_priv = NULL;
339 }
340
341 return cm_id_priv;
342 }
343
344 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
345 {
346 struct cm_id_private *cm_id_priv;
347 unsigned long flags;
348
349 spin_lock_irqsave(&cm.lock, flags);
350 cm_id_priv = cm_get_id(local_id, remote_id);
351 spin_unlock_irqrestore(&cm.lock, flags);
352
353 return cm_id_priv;
354 }
355
356 static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
357 {
358 int i;
359
360 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
361 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
362 ((unsigned long *) mask)[i];
363 }
364
365 static int cm_compare_data(struct ib_cm_compare_data *src_data,
366 struct ib_cm_compare_data *dst_data)
367 {
368 u8 src[IB_CM_COMPARE_SIZE];
369 u8 dst[IB_CM_COMPARE_SIZE];
370
371 if (!src_data || !dst_data)
372 return 0;
373
374 cm_mask_copy(src, src_data->data, dst_data->mask);
375 cm_mask_copy(dst, dst_data->data, src_data->mask);
376 return memcmp(src, dst, IB_CM_COMPARE_SIZE);
377 }
378
379 static int cm_compare_private_data(u8 *private_data,
380 struct ib_cm_compare_data *dst_data)
381 {
382 u8 src[IB_CM_COMPARE_SIZE];
383
384 if (!dst_data)
385 return 0;
386
387 cm_mask_copy(src, private_data, dst_data->mask);
388 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
389 }
390
391 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
392 {
393 struct rb_node **link = &cm.listen_service_table.rb_node;
394 struct rb_node *parent = NULL;
395 struct cm_id_private *cur_cm_id_priv;
396 __be64 service_id = cm_id_priv->id.service_id;
397 __be64 service_mask = cm_id_priv->id.service_mask;
398 int data_cmp;
399
400 while (*link) {
401 parent = *link;
402 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
403 service_node);
404 data_cmp = cm_compare_data(cm_id_priv->compare_data,
405 cur_cm_id_priv->compare_data);
406 if ((cur_cm_id_priv->id.service_mask & service_id) ==
407 (service_mask & cur_cm_id_priv->id.service_id) &&
408 (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
409 !data_cmp)
410 return cur_cm_id_priv;
411
412 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
413 link = &(*link)->rb_left;
414 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
415 link = &(*link)->rb_right;
416 else if (service_id < cur_cm_id_priv->id.service_id)
417 link = &(*link)->rb_left;
418 else if (service_id > cur_cm_id_priv->id.service_id)
419 link = &(*link)->rb_right;
420 else if (data_cmp < 0)
421 link = &(*link)->rb_left;
422 else
423 link = &(*link)->rb_right;
424 }
425 rb_link_node(&cm_id_priv->service_node, parent, link);
426 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
427 return NULL;
428 }
429
430 static struct cm_id_private * cm_find_listen(struct ib_device *device,
431 __be64 service_id,
432 u8 *private_data)
433 {
434 struct rb_node *node = cm.listen_service_table.rb_node;
435 struct cm_id_private *cm_id_priv;
436 int data_cmp;
437
438 while (node) {
439 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
440 data_cmp = cm_compare_private_data(private_data,
441 cm_id_priv->compare_data);
442 if ((cm_id_priv->id.service_mask & service_id) ==
443 cm_id_priv->id.service_id &&
444 (cm_id_priv->id.device == device) && !data_cmp)
445 return cm_id_priv;
446
447 if (device < cm_id_priv->id.device)
448 node = node->rb_left;
449 else if (device > cm_id_priv->id.device)
450 node = node->rb_right;
451 else if (service_id < cm_id_priv->id.service_id)
452 node = node->rb_left;
453 else if (service_id > cm_id_priv->id.service_id)
454 node = node->rb_right;
455 else if (data_cmp < 0)
456 node = node->rb_left;
457 else
458 node = node->rb_right;
459 }
460 return NULL;
461 }
462
463 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
464 *timewait_info)
465 {
466 struct rb_node **link = &cm.remote_id_table.rb_node;
467 struct rb_node *parent = NULL;
468 struct cm_timewait_info *cur_timewait_info;
469 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
470 __be32 remote_id = timewait_info->work.remote_id;
471
472 while (*link) {
473 parent = *link;
474 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
475 remote_id_node);
476 if (remote_id < cur_timewait_info->work.remote_id)
477 link = &(*link)->rb_left;
478 else if (remote_id > cur_timewait_info->work.remote_id)
479 link = &(*link)->rb_right;
480 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
481 link = &(*link)->rb_left;
482 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
483 link = &(*link)->rb_right;
484 else
485 return cur_timewait_info;
486 }
487 timewait_info->inserted_remote_id = 1;
488 rb_link_node(&timewait_info->remote_id_node, parent, link);
489 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
490 return NULL;
491 }
492
493 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
494 __be32 remote_id)
495 {
496 struct rb_node *node = cm.remote_id_table.rb_node;
497 struct cm_timewait_info *timewait_info;
498
499 while (node) {
500 timewait_info = rb_entry(node, struct cm_timewait_info,
501 remote_id_node);
502 if (remote_id < timewait_info->work.remote_id)
503 node = node->rb_left;
504 else if (remote_id > timewait_info->work.remote_id)
505 node = node->rb_right;
506 else if (remote_ca_guid < timewait_info->remote_ca_guid)
507 node = node->rb_left;
508 else if (remote_ca_guid > timewait_info->remote_ca_guid)
509 node = node->rb_right;
510 else
511 return timewait_info;
512 }
513 return NULL;
514 }
515
516 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
517 *timewait_info)
518 {
519 struct rb_node **link = &cm.remote_qp_table.rb_node;
520 struct rb_node *parent = NULL;
521 struct cm_timewait_info *cur_timewait_info;
522 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
523 __be32 remote_qpn = timewait_info->remote_qpn;
524
525 while (*link) {
526 parent = *link;
527 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
528 remote_qp_node);
529 if (remote_qpn < cur_timewait_info->remote_qpn)
530 link = &(*link)->rb_left;
531 else if (remote_qpn > cur_timewait_info->remote_qpn)
532 link = &(*link)->rb_right;
533 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
534 link = &(*link)->rb_left;
535 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
536 link = &(*link)->rb_right;
537 else
538 return cur_timewait_info;
539 }
540 timewait_info->inserted_remote_qp = 1;
541 rb_link_node(&timewait_info->remote_qp_node, parent, link);
542 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
543 return NULL;
544 }
545
546 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
547 *cm_id_priv)
548 {
549 struct rb_node **link = &cm.remote_sidr_table.rb_node;
550 struct rb_node *parent = NULL;
551 struct cm_id_private *cur_cm_id_priv;
552 union ib_gid *port_gid = &cm_id_priv->av.dgid;
553 __be32 remote_id = cm_id_priv->id.remote_id;
554
555 while (*link) {
556 parent = *link;
557 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
558 sidr_id_node);
559 if (remote_id < cur_cm_id_priv->id.remote_id)
560 link = &(*link)->rb_left;
561 else if (remote_id > cur_cm_id_priv->id.remote_id)
562 link = &(*link)->rb_right;
563 else {
564 int cmp;
565 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
566 sizeof *port_gid);
567 if (cmp < 0)
568 link = &(*link)->rb_left;
569 else if (cmp > 0)
570 link = &(*link)->rb_right;
571 else
572 return cur_cm_id_priv;
573 }
574 }
575 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
576 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
577 return NULL;
578 }
579
580 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
581 enum ib_cm_sidr_status status)
582 {
583 struct ib_cm_sidr_rep_param param;
584
585 memset(&param, 0, sizeof param);
586 param.status = status;
587 ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
588 }
589
590 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
591 ib_cm_handler cm_handler,
592 void *context)
593 {
594 struct cm_id_private *cm_id_priv;
595 int ret;
596
597 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
598 if (!cm_id_priv)
599 return ERR_PTR(-ENOMEM);
600
601 cm_id_priv->id.state = IB_CM_IDLE;
602 cm_id_priv->id.device = device;
603 cm_id_priv->id.cm_handler = cm_handler;
604 cm_id_priv->id.context = context;
605 cm_id_priv->id.remote_cm_qpn = 1;
606 ret = cm_alloc_id(cm_id_priv);
607 if (ret)
608 goto error;
609
610 spin_lock_init(&cm_id_priv->lock);
611 init_completion(&cm_id_priv->comp);
612 INIT_LIST_HEAD(&cm_id_priv->work_list);
613 atomic_set(&cm_id_priv->work_count, -1);
614 atomic_set(&cm_id_priv->refcount, 1);
615 return &cm_id_priv->id;
616
617 error:
618 kfree(cm_id_priv);
619 return ERR_PTR(-ENOMEM);
620 }
621 EXPORT_SYMBOL(ib_create_cm_id);
622
623 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
624 {
625 struct cm_work *work;
626
627 if (list_empty(&cm_id_priv->work_list))
628 return NULL;
629
630 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
631 list_del(&work->list);
632 return work;
633 }
634
635 static void cm_free_work(struct cm_work *work)
636 {
637 if (work->mad_recv_wc)
638 ib_free_recv_mad(work->mad_recv_wc);
639 kfree(work);
640 }
641
642 static inline int cm_convert_to_ms(int iba_time)
643 {
644 /* approximate conversion to ms from 4.096us x 2^iba_time */
645 return 1 << max(iba_time - 8, 0);
646 }
647
648 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
649 {
650 if (timewait_info->inserted_remote_id) {
651 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
652 timewait_info->inserted_remote_id = 0;
653 }
654
655 if (timewait_info->inserted_remote_qp) {
656 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
657 timewait_info->inserted_remote_qp = 0;
658 }
659 }
660
661 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
662 {
663 struct cm_timewait_info *timewait_info;
664
665 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
666 if (!timewait_info)
667 return ERR_PTR(-ENOMEM);
668
669 timewait_info->work.local_id = local_id;
670 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
671 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
672 return timewait_info;
673 }
674
675 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
676 {
677 int wait_time;
678 unsigned long flags;
679
680 spin_lock_irqsave(&cm.lock, flags);
681 cm_cleanup_timewait(cm_id_priv->timewait_info);
682 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
683 spin_unlock_irqrestore(&cm.lock, flags);
684
685 /*
686 * The cm_id could be destroyed by the user before we exit timewait.
687 * To protect against this, we search for the cm_id after exiting
688 * timewait before notifying the user that we've exited timewait.
689 */
690 cm_id_priv->id.state = IB_CM_TIMEWAIT;
691 wait_time = cm_convert_to_ms(cm_id_priv->av.packet_life_time + 1);
692 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
693 msecs_to_jiffies(wait_time));
694 cm_id_priv->timewait_info = NULL;
695 }
696
697 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
698 {
699 unsigned long flags;
700
701 cm_id_priv->id.state = IB_CM_IDLE;
702 if (cm_id_priv->timewait_info) {
703 spin_lock_irqsave(&cm.lock, flags);
704 cm_cleanup_timewait(cm_id_priv->timewait_info);
705 spin_unlock_irqrestore(&cm.lock, flags);
706 kfree(cm_id_priv->timewait_info);
707 cm_id_priv->timewait_info = NULL;
708 }
709 }
710
711 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
712 {
713 struct cm_id_private *cm_id_priv;
714 struct cm_work *work;
715 unsigned long flags;
716
717 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
718 retest:
719 spin_lock_irqsave(&cm_id_priv->lock, flags);
720 switch (cm_id->state) {
721 case IB_CM_LISTEN:
722 cm_id->state = IB_CM_IDLE;
723 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
724 spin_lock_irqsave(&cm.lock, flags);
725 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
726 spin_unlock_irqrestore(&cm.lock, flags);
727 break;
728 case IB_CM_SIDR_REQ_SENT:
729 cm_id->state = IB_CM_IDLE;
730 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
731 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
732 break;
733 case IB_CM_SIDR_REQ_RCVD:
734 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
735 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
736 break;
737 case IB_CM_REQ_SENT:
738 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
739 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
740 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
741 &cm_id_priv->id.device->node_guid,
742 sizeof cm_id_priv->id.device->node_guid,
743 NULL, 0);
744 break;
745 case IB_CM_REQ_RCVD:
746 if (err == -ENOMEM) {
747 /* Do not reject to allow future retries. */
748 cm_reset_to_idle(cm_id_priv);
749 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
750 } else {
751 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
752 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
753 NULL, 0, NULL, 0);
754 }
755 break;
756 case IB_CM_MRA_REQ_RCVD:
757 case IB_CM_REP_SENT:
758 case IB_CM_MRA_REP_RCVD:
759 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
760 /* Fall through */
761 case IB_CM_MRA_REQ_SENT:
762 case IB_CM_REP_RCVD:
763 case IB_CM_MRA_REP_SENT:
764 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
765 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
766 NULL, 0, NULL, 0);
767 break;
768 case IB_CM_ESTABLISHED:
769 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
770 ib_send_cm_dreq(cm_id, NULL, 0);
771 goto retest;
772 case IB_CM_DREQ_SENT:
773 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
774 cm_enter_timewait(cm_id_priv);
775 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
776 break;
777 case IB_CM_DREQ_RCVD:
778 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
779 ib_send_cm_drep(cm_id, NULL, 0);
780 break;
781 default:
782 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
783 break;
784 }
785
786 cm_free_id(cm_id->local_id);
787 cm_deref_id(cm_id_priv);
788 wait_for_completion(&cm_id_priv->comp);
789 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
790 cm_free_work(work);
791 kfree(cm_id_priv->compare_data);
792 kfree(cm_id_priv->private_data);
793 kfree(cm_id_priv);
794 }
795
796 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
797 {
798 cm_destroy_id(cm_id, 0);
799 }
800 EXPORT_SYMBOL(ib_destroy_cm_id);
801
802 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
803 struct ib_cm_compare_data *compare_data)
804 {
805 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
806 unsigned long flags;
807 int ret = 0;
808
809 service_mask = service_mask ? service_mask :
810 __constant_cpu_to_be64(~0ULL);
811 service_id &= service_mask;
812 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
813 (service_id != IB_CM_ASSIGN_SERVICE_ID))
814 return -EINVAL;
815
816 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
817 if (cm_id->state != IB_CM_IDLE)
818 return -EINVAL;
819
820 if (compare_data) {
821 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
822 GFP_KERNEL);
823 if (!cm_id_priv->compare_data)
824 return -ENOMEM;
825 cm_mask_copy(cm_id_priv->compare_data->data,
826 compare_data->data, compare_data->mask);
827 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
828 IB_CM_COMPARE_SIZE);
829 }
830
831 cm_id->state = IB_CM_LISTEN;
832
833 spin_lock_irqsave(&cm.lock, flags);
834 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
835 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
836 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
837 } else {
838 cm_id->service_id = service_id;
839 cm_id->service_mask = service_mask;
840 }
841 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
842 spin_unlock_irqrestore(&cm.lock, flags);
843
844 if (cur_cm_id_priv) {
845 cm_id->state = IB_CM_IDLE;
846 kfree(cm_id_priv->compare_data);
847 cm_id_priv->compare_data = NULL;
848 ret = -EBUSY;
849 }
850 return ret;
851 }
852 EXPORT_SYMBOL(ib_cm_listen);
853
854 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
855 enum cm_msg_sequence msg_seq)
856 {
857 u64 hi_tid, low_tid;
858
859 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
860 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
861 (msg_seq << 30));
862 return cpu_to_be64(hi_tid | low_tid);
863 }
864
865 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
866 __be16 attr_id, __be64 tid)
867 {
868 hdr->base_version = IB_MGMT_BASE_VERSION;
869 hdr->mgmt_class = IB_MGMT_CLASS_CM;
870 hdr->class_version = IB_CM_CLASS_VERSION;
871 hdr->method = IB_MGMT_METHOD_SEND;
872 hdr->attr_id = attr_id;
873 hdr->tid = tid;
874 }
875
876 static void cm_format_req(struct cm_req_msg *req_msg,
877 struct cm_id_private *cm_id_priv,
878 struct ib_cm_req_param *param)
879 {
880 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
881 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
882
883 req_msg->local_comm_id = cm_id_priv->id.local_id;
884 req_msg->service_id = param->service_id;
885 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
886 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
887 cm_req_set_resp_res(req_msg, param->responder_resources);
888 cm_req_set_init_depth(req_msg, param->initiator_depth);
889 cm_req_set_remote_resp_timeout(req_msg,
890 param->remote_cm_response_timeout);
891 cm_req_set_qp_type(req_msg, param->qp_type);
892 cm_req_set_flow_ctrl(req_msg, param->flow_control);
893 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
894 cm_req_set_local_resp_timeout(req_msg,
895 param->local_cm_response_timeout);
896 cm_req_set_retry_count(req_msg, param->retry_count);
897 req_msg->pkey = param->primary_path->pkey;
898 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
899 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
900 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
901 cm_req_set_srq(req_msg, param->srq);
902
903 req_msg->primary_local_lid = param->primary_path->slid;
904 req_msg->primary_remote_lid = param->primary_path->dlid;
905 req_msg->primary_local_gid = param->primary_path->sgid;
906 req_msg->primary_remote_gid = param->primary_path->dgid;
907 cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label);
908 cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate);
909 req_msg->primary_traffic_class = param->primary_path->traffic_class;
910 req_msg->primary_hop_limit = param->primary_path->hop_limit;
911 cm_req_set_primary_sl(req_msg, param->primary_path->sl);
912 cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */
913 cm_req_set_primary_local_ack_timeout(req_msg,
914 min(31, param->primary_path->packet_life_time + 1));
915
916 if (param->alternate_path) {
917 req_msg->alt_local_lid = param->alternate_path->slid;
918 req_msg->alt_remote_lid = param->alternate_path->dlid;
919 req_msg->alt_local_gid = param->alternate_path->sgid;
920 req_msg->alt_remote_gid = param->alternate_path->dgid;
921 cm_req_set_alt_flow_label(req_msg,
922 param->alternate_path->flow_label);
923 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate);
924 req_msg->alt_traffic_class = param->alternate_path->traffic_class;
925 req_msg->alt_hop_limit = param->alternate_path->hop_limit;
926 cm_req_set_alt_sl(req_msg, param->alternate_path->sl);
927 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */
928 cm_req_set_alt_local_ack_timeout(req_msg,
929 min(31, param->alternate_path->packet_life_time + 1));
930 }
931
932 if (param->private_data && param->private_data_len)
933 memcpy(req_msg->private_data, param->private_data,
934 param->private_data_len);
935 }
936
937 static int cm_validate_req_param(struct ib_cm_req_param *param)
938 {
939 /* peer-to-peer not supported */
940 if (param->peer_to_peer)
941 return -EINVAL;
942
943 if (!param->primary_path)
944 return -EINVAL;
945
946 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
947 return -EINVAL;
948
949 if (param->private_data &&
950 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
951 return -EINVAL;
952
953 if (param->alternate_path &&
954 (param->alternate_path->pkey != param->primary_path->pkey ||
955 param->alternate_path->mtu != param->primary_path->mtu))
956 return -EINVAL;
957
958 return 0;
959 }
960
961 int ib_send_cm_req(struct ib_cm_id *cm_id,
962 struct ib_cm_req_param *param)
963 {
964 struct cm_id_private *cm_id_priv;
965 struct cm_req_msg *req_msg;
966 unsigned long flags;
967 int ret;
968
969 ret = cm_validate_req_param(param);
970 if (ret)
971 return ret;
972
973 /* Verify that we're not in timewait. */
974 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
975 spin_lock_irqsave(&cm_id_priv->lock, flags);
976 if (cm_id->state != IB_CM_IDLE) {
977 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
978 ret = -EINVAL;
979 goto out;
980 }
981 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
982
983 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
984 id.local_id);
985 if (IS_ERR(cm_id_priv->timewait_info)) {
986 ret = PTR_ERR(cm_id_priv->timewait_info);
987 goto out;
988 }
989
990 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
991 if (ret)
992 goto error1;
993 if (param->alternate_path) {
994 ret = cm_init_av_by_path(param->alternate_path,
995 &cm_id_priv->alt_av);
996 if (ret)
997 goto error1;
998 }
999 cm_id->service_id = param->service_id;
1000 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
1001 cm_id_priv->timeout_ms = cm_convert_to_ms(
1002 param->primary_path->packet_life_time) * 2 +
1003 cm_convert_to_ms(
1004 param->remote_cm_response_timeout);
1005 cm_id_priv->max_cm_retries = param->max_cm_retries;
1006 cm_id_priv->initiator_depth = param->initiator_depth;
1007 cm_id_priv->responder_resources = param->responder_resources;
1008 cm_id_priv->retry_count = param->retry_count;
1009 cm_id_priv->path_mtu = param->primary_path->mtu;
1010 cm_id_priv->pkey = param->primary_path->pkey;
1011 cm_id_priv->qp_type = param->qp_type;
1012
1013 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1014 if (ret)
1015 goto error1;
1016
1017 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1018 cm_format_req(req_msg, cm_id_priv, param);
1019 cm_id_priv->tid = req_msg->hdr.tid;
1020 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1021 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1022
1023 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1024 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1025
1026 spin_lock_irqsave(&cm_id_priv->lock, flags);
1027 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1028 if (ret) {
1029 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1030 goto error2;
1031 }
1032 BUG_ON(cm_id->state != IB_CM_IDLE);
1033 cm_id->state = IB_CM_REQ_SENT;
1034 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1035 return 0;
1036
1037 error2: cm_free_msg(cm_id_priv->msg);
1038 error1: kfree(cm_id_priv->timewait_info);
1039 out: return ret;
1040 }
1041 EXPORT_SYMBOL(ib_send_cm_req);
1042
1043 static int cm_issue_rej(struct cm_port *port,
1044 struct ib_mad_recv_wc *mad_recv_wc,
1045 enum ib_cm_rej_reason reason,
1046 enum cm_msg_response msg_rejected,
1047 void *ari, u8 ari_length)
1048 {
1049 struct ib_mad_send_buf *msg = NULL;
1050 struct cm_rej_msg *rej_msg, *rcv_msg;
1051 int ret;
1052
1053 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1054 if (ret)
1055 return ret;
1056
1057 /* We just need common CM header information. Cast to any message. */
1058 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1059 rej_msg = (struct cm_rej_msg *) msg->mad;
1060
1061 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1062 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1063 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1064 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1065 rej_msg->reason = cpu_to_be16(reason);
1066
1067 if (ari && ari_length) {
1068 cm_rej_set_reject_info_len(rej_msg, ari_length);
1069 memcpy(rej_msg->ari, ari, ari_length);
1070 }
1071
1072 ret = ib_post_send_mad(msg, NULL);
1073 if (ret)
1074 cm_free_msg(msg);
1075
1076 return ret;
1077 }
1078
1079 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1080 __be32 local_qpn, __be32 remote_qpn)
1081 {
1082 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1083 ((local_ca_guid == remote_ca_guid) &&
1084 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1085 }
1086
1087 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1088 struct ib_sa_path_rec *primary_path,
1089 struct ib_sa_path_rec *alt_path)
1090 {
1091 memset(primary_path, 0, sizeof *primary_path);
1092 primary_path->dgid = req_msg->primary_local_gid;
1093 primary_path->sgid = req_msg->primary_remote_gid;
1094 primary_path->dlid = req_msg->primary_local_lid;
1095 primary_path->slid = req_msg->primary_remote_lid;
1096 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1097 primary_path->hop_limit = req_msg->primary_hop_limit;
1098 primary_path->traffic_class = req_msg->primary_traffic_class;
1099 primary_path->reversible = 1;
1100 primary_path->pkey = req_msg->pkey;
1101 primary_path->sl = cm_req_get_primary_sl(req_msg);
1102 primary_path->mtu_selector = IB_SA_EQ;
1103 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1104 primary_path->rate_selector = IB_SA_EQ;
1105 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1106 primary_path->packet_life_time_selector = IB_SA_EQ;
1107 primary_path->packet_life_time =
1108 cm_req_get_primary_local_ack_timeout(req_msg);
1109 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1110
1111 if (req_msg->alt_local_lid) {
1112 memset(alt_path, 0, sizeof *alt_path);
1113 alt_path->dgid = req_msg->alt_local_gid;
1114 alt_path->sgid = req_msg->alt_remote_gid;
1115 alt_path->dlid = req_msg->alt_local_lid;
1116 alt_path->slid = req_msg->alt_remote_lid;
1117 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1118 alt_path->hop_limit = req_msg->alt_hop_limit;
1119 alt_path->traffic_class = req_msg->alt_traffic_class;
1120 alt_path->reversible = 1;
1121 alt_path->pkey = req_msg->pkey;
1122 alt_path->sl = cm_req_get_alt_sl(req_msg);
1123 alt_path->mtu_selector = IB_SA_EQ;
1124 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1125 alt_path->rate_selector = IB_SA_EQ;
1126 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1127 alt_path->packet_life_time_selector = IB_SA_EQ;
1128 alt_path->packet_life_time =
1129 cm_req_get_alt_local_ack_timeout(req_msg);
1130 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1131 }
1132 }
1133
1134 static void cm_format_req_event(struct cm_work *work,
1135 struct cm_id_private *cm_id_priv,
1136 struct ib_cm_id *listen_id)
1137 {
1138 struct cm_req_msg *req_msg;
1139 struct ib_cm_req_event_param *param;
1140
1141 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1142 param = &work->cm_event.param.req_rcvd;
1143 param->listen_id = listen_id;
1144 param->port = cm_id_priv->av.port->port_num;
1145 param->primary_path = &work->path[0];
1146 if (req_msg->alt_local_lid)
1147 param->alternate_path = &work->path[1];
1148 else
1149 param->alternate_path = NULL;
1150 param->remote_ca_guid = req_msg->local_ca_guid;
1151 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1152 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1153 param->qp_type = cm_req_get_qp_type(req_msg);
1154 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1155 param->responder_resources = cm_req_get_init_depth(req_msg);
1156 param->initiator_depth = cm_req_get_resp_res(req_msg);
1157 param->local_cm_response_timeout =
1158 cm_req_get_remote_resp_timeout(req_msg);
1159 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1160 param->remote_cm_response_timeout =
1161 cm_req_get_local_resp_timeout(req_msg);
1162 param->retry_count = cm_req_get_retry_count(req_msg);
1163 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1164 param->srq = cm_req_get_srq(req_msg);
1165 work->cm_event.private_data = &req_msg->private_data;
1166 }
1167
1168 static void cm_process_work(struct cm_id_private *cm_id_priv,
1169 struct cm_work *work)
1170 {
1171 unsigned long flags;
1172 int ret;
1173
1174 /* We will typically only have the current event to report. */
1175 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1176 cm_free_work(work);
1177
1178 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1179 spin_lock_irqsave(&cm_id_priv->lock, flags);
1180 work = cm_dequeue_work(cm_id_priv);
1181 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1182 BUG_ON(!work);
1183 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1184 &work->cm_event);
1185 cm_free_work(work);
1186 }
1187 cm_deref_id(cm_id_priv);
1188 if (ret)
1189 cm_destroy_id(&cm_id_priv->id, ret);
1190 }
1191
1192 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1193 struct cm_id_private *cm_id_priv,
1194 enum cm_msg_response msg_mraed, u8 service_timeout,
1195 const void *private_data, u8 private_data_len)
1196 {
1197 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1198 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1199 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1200 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1201 cm_mra_set_service_timeout(mra_msg, service_timeout);
1202
1203 if (private_data && private_data_len)
1204 memcpy(mra_msg->private_data, private_data, private_data_len);
1205 }
1206
1207 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1208 struct cm_id_private *cm_id_priv,
1209 enum ib_cm_rej_reason reason,
1210 void *ari,
1211 u8 ari_length,
1212 const void *private_data,
1213 u8 private_data_len)
1214 {
1215 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1216 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1217
1218 switch(cm_id_priv->id.state) {
1219 case IB_CM_REQ_RCVD:
1220 rej_msg->local_comm_id = 0;
1221 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1222 break;
1223 case IB_CM_MRA_REQ_SENT:
1224 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1225 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1226 break;
1227 case IB_CM_REP_RCVD:
1228 case IB_CM_MRA_REP_SENT:
1229 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1230 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1231 break;
1232 default:
1233 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1234 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1235 break;
1236 }
1237
1238 rej_msg->reason = cpu_to_be16(reason);
1239 if (ari && ari_length) {
1240 cm_rej_set_reject_info_len(rej_msg, ari_length);
1241 memcpy(rej_msg->ari, ari, ari_length);
1242 }
1243
1244 if (private_data && private_data_len)
1245 memcpy(rej_msg->private_data, private_data, private_data_len);
1246 }
1247
1248 static void cm_dup_req_handler(struct cm_work *work,
1249 struct cm_id_private *cm_id_priv)
1250 {
1251 struct ib_mad_send_buf *msg = NULL;
1252 unsigned long flags;
1253 int ret;
1254
1255 /* Quick state check to discard duplicate REQs. */
1256 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1257 return;
1258
1259 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1260 if (ret)
1261 return;
1262
1263 spin_lock_irqsave(&cm_id_priv->lock, flags);
1264 switch (cm_id_priv->id.state) {
1265 case IB_CM_MRA_REQ_SENT:
1266 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1267 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1268 cm_id_priv->private_data,
1269 cm_id_priv->private_data_len);
1270 break;
1271 case IB_CM_TIMEWAIT:
1272 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1273 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1274 break;
1275 default:
1276 goto unlock;
1277 }
1278 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1279
1280 ret = ib_post_send_mad(msg, NULL);
1281 if (ret)
1282 goto free;
1283 return;
1284
1285 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1286 free: cm_free_msg(msg);
1287 }
1288
1289 static struct cm_id_private * cm_match_req(struct cm_work *work,
1290 struct cm_id_private *cm_id_priv)
1291 {
1292 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1293 struct cm_timewait_info *timewait_info;
1294 struct cm_req_msg *req_msg;
1295 unsigned long flags;
1296
1297 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1298
1299 /* Check for duplicate REQ and stale connections. */
1300 spin_lock_irqsave(&cm.lock, flags);
1301 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1302 if (!timewait_info)
1303 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1304
1305 if (timewait_info) {
1306 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1307 timewait_info->work.remote_id);
1308 cm_cleanup_timewait(cm_id_priv->timewait_info);
1309 spin_unlock_irqrestore(&cm.lock, flags);
1310 if (cur_cm_id_priv) {
1311 cm_dup_req_handler(work, cur_cm_id_priv);
1312 cm_deref_id(cur_cm_id_priv);
1313 } else
1314 cm_issue_rej(work->port, work->mad_recv_wc,
1315 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1316 NULL, 0);
1317 listen_cm_id_priv = NULL;
1318 goto out;
1319 }
1320
1321 /* Find matching listen request. */
1322 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1323 req_msg->service_id,
1324 req_msg->private_data);
1325 if (!listen_cm_id_priv) {
1326 cm_cleanup_timewait(cm_id_priv->timewait_info);
1327 spin_unlock_irqrestore(&cm.lock, flags);
1328 cm_issue_rej(work->port, work->mad_recv_wc,
1329 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1330 NULL, 0);
1331 goto out;
1332 }
1333 atomic_inc(&listen_cm_id_priv->refcount);
1334 atomic_inc(&cm_id_priv->refcount);
1335 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1336 atomic_inc(&cm_id_priv->work_count);
1337 spin_unlock_irqrestore(&cm.lock, flags);
1338 out:
1339 return listen_cm_id_priv;
1340 }
1341
1342 static int cm_req_handler(struct cm_work *work)
1343 {
1344 struct ib_cm_id *cm_id;
1345 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1346 struct cm_req_msg *req_msg;
1347 int ret;
1348
1349 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1350
1351 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
1352 if (IS_ERR(cm_id))
1353 return PTR_ERR(cm_id);
1354
1355 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1356 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1357 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1358 work->mad_recv_wc->recv_buf.grh,
1359 &cm_id_priv->av);
1360 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1361 id.local_id);
1362 if (IS_ERR(cm_id_priv->timewait_info)) {
1363 ret = PTR_ERR(cm_id_priv->timewait_info);
1364 goto destroy;
1365 }
1366 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1367 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1368 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1369
1370 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1371 if (!listen_cm_id_priv) {
1372 ret = -EINVAL;
1373 kfree(cm_id_priv->timewait_info);
1374 goto destroy;
1375 }
1376
1377 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1378 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1379 cm_id_priv->id.service_id = req_msg->service_id;
1380 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
1381
1382 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1383 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1384 if (ret) {
1385 ib_get_cached_gid(work->port->cm_dev->device,
1386 work->port->port_num, 0, &work->path[0].sgid);
1387 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1388 &work->path[0].sgid, sizeof work->path[0].sgid,
1389 NULL, 0);
1390 goto rejected;
1391 }
1392 if (req_msg->alt_local_lid) {
1393 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1394 if (ret) {
1395 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1396 &work->path[0].sgid,
1397 sizeof work->path[0].sgid, NULL, 0);
1398 goto rejected;
1399 }
1400 }
1401 cm_id_priv->tid = req_msg->hdr.tid;
1402 cm_id_priv->timeout_ms = cm_convert_to_ms(
1403 cm_req_get_local_resp_timeout(req_msg));
1404 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1405 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1406 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1407 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1408 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1409 cm_id_priv->pkey = req_msg->pkey;
1410 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1411 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1412 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1413 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1414
1415 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1416 cm_process_work(cm_id_priv, work);
1417 cm_deref_id(listen_cm_id_priv);
1418 return 0;
1419
1420 rejected:
1421 atomic_dec(&cm_id_priv->refcount);
1422 cm_deref_id(listen_cm_id_priv);
1423 destroy:
1424 ib_destroy_cm_id(cm_id);
1425 return ret;
1426 }
1427
1428 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1429 struct cm_id_private *cm_id_priv,
1430 struct ib_cm_rep_param *param)
1431 {
1432 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1433 rep_msg->local_comm_id = cm_id_priv->id.local_id;
1434 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1435 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1436 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1437 rep_msg->resp_resources = param->responder_resources;
1438 rep_msg->initiator_depth = param->initiator_depth;
1439 cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay);
1440 cm_rep_set_failover(rep_msg, param->failover_accepted);
1441 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1442 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1443 cm_rep_set_srq(rep_msg, param->srq);
1444 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1445
1446 if (param->private_data && param->private_data_len)
1447 memcpy(rep_msg->private_data, param->private_data,
1448 param->private_data_len);
1449 }
1450
1451 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1452 struct ib_cm_rep_param *param)
1453 {
1454 struct cm_id_private *cm_id_priv;
1455 struct ib_mad_send_buf *msg;
1456 struct cm_rep_msg *rep_msg;
1457 unsigned long flags;
1458 int ret;
1459
1460 if (param->private_data &&
1461 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1462 return -EINVAL;
1463
1464 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1465 spin_lock_irqsave(&cm_id_priv->lock, flags);
1466 if (cm_id->state != IB_CM_REQ_RCVD &&
1467 cm_id->state != IB_CM_MRA_REQ_SENT) {
1468 ret = -EINVAL;
1469 goto out;
1470 }
1471
1472 ret = cm_alloc_msg(cm_id_priv, &msg);
1473 if (ret)
1474 goto out;
1475
1476 rep_msg = (struct cm_rep_msg *) msg->mad;
1477 cm_format_rep(rep_msg, cm_id_priv, param);
1478 msg->timeout_ms = cm_id_priv->timeout_ms;
1479 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1480
1481 ret = ib_post_send_mad(msg, NULL);
1482 if (ret) {
1483 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1484 cm_free_msg(msg);
1485 return ret;
1486 }
1487
1488 cm_id->state = IB_CM_REP_SENT;
1489 cm_id_priv->msg = msg;
1490 cm_id_priv->initiator_depth = param->initiator_depth;
1491 cm_id_priv->responder_resources = param->responder_resources;
1492 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1493 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1494
1495 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1496 return ret;
1497 }
1498 EXPORT_SYMBOL(ib_send_cm_rep);
1499
1500 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1501 struct cm_id_private *cm_id_priv,
1502 const void *private_data,
1503 u8 private_data_len)
1504 {
1505 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1506 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1507 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1508
1509 if (private_data && private_data_len)
1510 memcpy(rtu_msg->private_data, private_data, private_data_len);
1511 }
1512
1513 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1514 const void *private_data,
1515 u8 private_data_len)
1516 {
1517 struct cm_id_private *cm_id_priv;
1518 struct ib_mad_send_buf *msg;
1519 unsigned long flags;
1520 void *data;
1521 int ret;
1522
1523 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1524 return -EINVAL;
1525
1526 data = cm_copy_private_data(private_data, private_data_len);
1527 if (IS_ERR(data))
1528 return PTR_ERR(data);
1529
1530 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1531 spin_lock_irqsave(&cm_id_priv->lock, flags);
1532 if (cm_id->state != IB_CM_REP_RCVD &&
1533 cm_id->state != IB_CM_MRA_REP_SENT) {
1534 ret = -EINVAL;
1535 goto error;
1536 }
1537
1538 ret = cm_alloc_msg(cm_id_priv, &msg);
1539 if (ret)
1540 goto error;
1541
1542 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1543 private_data, private_data_len);
1544
1545 ret = ib_post_send_mad(msg, NULL);
1546 if (ret) {
1547 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1548 cm_free_msg(msg);
1549 kfree(data);
1550 return ret;
1551 }
1552
1553 cm_id->state = IB_CM_ESTABLISHED;
1554 cm_set_private_data(cm_id_priv, data, private_data_len);
1555 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1556 return 0;
1557
1558 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1559 kfree(data);
1560 return ret;
1561 }
1562 EXPORT_SYMBOL(ib_send_cm_rtu);
1563
1564 static void cm_format_rep_event(struct cm_work *work)
1565 {
1566 struct cm_rep_msg *rep_msg;
1567 struct ib_cm_rep_event_param *param;
1568
1569 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1570 param = &work->cm_event.param.rep_rcvd;
1571 param->remote_ca_guid = rep_msg->local_ca_guid;
1572 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1573 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1574 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1575 param->responder_resources = rep_msg->initiator_depth;
1576 param->initiator_depth = rep_msg->resp_resources;
1577 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1578 param->failover_accepted = cm_rep_get_failover(rep_msg);
1579 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1580 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1581 param->srq = cm_rep_get_srq(rep_msg);
1582 work->cm_event.private_data = &rep_msg->private_data;
1583 }
1584
1585 static void cm_dup_rep_handler(struct cm_work *work)
1586 {
1587 struct cm_id_private *cm_id_priv;
1588 struct cm_rep_msg *rep_msg;
1589 struct ib_mad_send_buf *msg = NULL;
1590 unsigned long flags;
1591 int ret;
1592
1593 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1594 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1595 rep_msg->local_comm_id);
1596 if (!cm_id_priv)
1597 return;
1598
1599 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1600 if (ret)
1601 goto deref;
1602
1603 spin_lock_irqsave(&cm_id_priv->lock, flags);
1604 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1605 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1606 cm_id_priv->private_data,
1607 cm_id_priv->private_data_len);
1608 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1609 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1610 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1611 cm_id_priv->private_data,
1612 cm_id_priv->private_data_len);
1613 else
1614 goto unlock;
1615 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1616
1617 ret = ib_post_send_mad(msg, NULL);
1618 if (ret)
1619 goto free;
1620 goto deref;
1621
1622 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1623 free: cm_free_msg(msg);
1624 deref: cm_deref_id(cm_id_priv);
1625 }
1626
1627 static int cm_rep_handler(struct cm_work *work)
1628 {
1629 struct cm_id_private *cm_id_priv;
1630 struct cm_rep_msg *rep_msg;
1631 unsigned long flags;
1632 int ret;
1633
1634 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1635 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1636 if (!cm_id_priv) {
1637 cm_dup_rep_handler(work);
1638 return -EINVAL;
1639 }
1640
1641 cm_format_rep_event(work);
1642
1643 spin_lock_irqsave(&cm_id_priv->lock, flags);
1644 switch (cm_id_priv->id.state) {
1645 case IB_CM_REQ_SENT:
1646 case IB_CM_MRA_REQ_RCVD:
1647 break;
1648 default:
1649 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1650 ret = -EINVAL;
1651 goto error;
1652 }
1653
1654 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1655 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1656 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1657
1658 spin_lock(&cm.lock);
1659 /* Check for duplicate REP. */
1660 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1661 spin_unlock(&cm.lock);
1662 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1663 ret = -EINVAL;
1664 goto error;
1665 }
1666 /* Check for a stale connection. */
1667 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1668 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1669 &cm.remote_id_table);
1670 cm_id_priv->timewait_info->inserted_remote_id = 0;
1671 spin_unlock(&cm.lock);
1672 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1673 cm_issue_rej(work->port, work->mad_recv_wc,
1674 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1675 NULL, 0);
1676 ret = -EINVAL;
1677 goto error;
1678 }
1679 spin_unlock(&cm.lock);
1680
1681 cm_id_priv->id.state = IB_CM_REP_RCVD;
1682 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1683 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1684 cm_id_priv->initiator_depth = rep_msg->resp_resources;
1685 cm_id_priv->responder_resources = rep_msg->initiator_depth;
1686 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1687 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1688
1689 /* todo: handle peer_to_peer */
1690
1691 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1692 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1693 if (!ret)
1694 list_add_tail(&work->list, &cm_id_priv->work_list);
1695 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1696
1697 if (ret)
1698 cm_process_work(cm_id_priv, work);
1699 else
1700 cm_deref_id(cm_id_priv);
1701 return 0;
1702
1703 error:
1704 cm_deref_id(cm_id_priv);
1705 return ret;
1706 }
1707
1708 static int cm_establish_handler(struct cm_work *work)
1709 {
1710 struct cm_id_private *cm_id_priv;
1711 unsigned long flags;
1712 int ret;
1713
1714 /* See comment in cm_establish about lookup. */
1715 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1716 if (!cm_id_priv)
1717 return -EINVAL;
1718
1719 spin_lock_irqsave(&cm_id_priv->lock, flags);
1720 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1721 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1722 goto out;
1723 }
1724
1725 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1726 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1727 if (!ret)
1728 list_add_tail(&work->list, &cm_id_priv->work_list);
1729 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1730
1731 if (ret)
1732 cm_process_work(cm_id_priv, work);
1733 else
1734 cm_deref_id(cm_id_priv);
1735 return 0;
1736 out:
1737 cm_deref_id(cm_id_priv);
1738 return -EINVAL;
1739 }
1740
1741 static int cm_rtu_handler(struct cm_work *work)
1742 {
1743 struct cm_id_private *cm_id_priv;
1744 struct cm_rtu_msg *rtu_msg;
1745 unsigned long flags;
1746 int ret;
1747
1748 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1749 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1750 rtu_msg->local_comm_id);
1751 if (!cm_id_priv)
1752 return -EINVAL;
1753
1754 work->cm_event.private_data = &rtu_msg->private_data;
1755
1756 spin_lock_irqsave(&cm_id_priv->lock, flags);
1757 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1758 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1759 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1760 goto out;
1761 }
1762 cm_id_priv->id.state = IB_CM_ESTABLISHED;
1763
1764 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1765 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1766 if (!ret)
1767 list_add_tail(&work->list, &cm_id_priv->work_list);
1768 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1769
1770 if (ret)
1771 cm_process_work(cm_id_priv, work);
1772 else
1773 cm_deref_id(cm_id_priv);
1774 return 0;
1775 out:
1776 cm_deref_id(cm_id_priv);
1777 return -EINVAL;
1778 }
1779
1780 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1781 struct cm_id_private *cm_id_priv,
1782 const void *private_data,
1783 u8 private_data_len)
1784 {
1785 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1786 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1787 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1788 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1789 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1790
1791 if (private_data && private_data_len)
1792 memcpy(dreq_msg->private_data, private_data, private_data_len);
1793 }
1794
1795 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1796 const void *private_data,
1797 u8 private_data_len)
1798 {
1799 struct cm_id_private *cm_id_priv;
1800 struct ib_mad_send_buf *msg;
1801 unsigned long flags;
1802 int ret;
1803
1804 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1805 return -EINVAL;
1806
1807 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1808 spin_lock_irqsave(&cm_id_priv->lock, flags);
1809 if (cm_id->state != IB_CM_ESTABLISHED) {
1810 ret = -EINVAL;
1811 goto out;
1812 }
1813
1814 ret = cm_alloc_msg(cm_id_priv, &msg);
1815 if (ret) {
1816 cm_enter_timewait(cm_id_priv);
1817 goto out;
1818 }
1819
1820 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1821 private_data, private_data_len);
1822 msg->timeout_ms = cm_id_priv->timeout_ms;
1823 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
1824
1825 ret = ib_post_send_mad(msg, NULL);
1826 if (ret) {
1827 cm_enter_timewait(cm_id_priv);
1828 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1829 cm_free_msg(msg);
1830 return ret;
1831 }
1832
1833 cm_id->state = IB_CM_DREQ_SENT;
1834 cm_id_priv->msg = msg;
1835 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1836 return ret;
1837 }
1838 EXPORT_SYMBOL(ib_send_cm_dreq);
1839
1840 static void cm_format_drep(struct cm_drep_msg *drep_msg,
1841 struct cm_id_private *cm_id_priv,
1842 const void *private_data,
1843 u8 private_data_len)
1844 {
1845 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
1846 drep_msg->local_comm_id = cm_id_priv->id.local_id;
1847 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1848
1849 if (private_data && private_data_len)
1850 memcpy(drep_msg->private_data, private_data, private_data_len);
1851 }
1852
1853 int ib_send_cm_drep(struct ib_cm_id *cm_id,
1854 const void *private_data,
1855 u8 private_data_len)
1856 {
1857 struct cm_id_private *cm_id_priv;
1858 struct ib_mad_send_buf *msg;
1859 unsigned long flags;
1860 void *data;
1861 int ret;
1862
1863 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
1864 return -EINVAL;
1865
1866 data = cm_copy_private_data(private_data, private_data_len);
1867 if (IS_ERR(data))
1868 return PTR_ERR(data);
1869
1870 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1871 spin_lock_irqsave(&cm_id_priv->lock, flags);
1872 if (cm_id->state != IB_CM_DREQ_RCVD) {
1873 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1874 kfree(data);
1875 return -EINVAL;
1876 }
1877
1878 cm_set_private_data(cm_id_priv, data, private_data_len);
1879 cm_enter_timewait(cm_id_priv);
1880
1881 ret = cm_alloc_msg(cm_id_priv, &msg);
1882 if (ret)
1883 goto out;
1884
1885 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1886 private_data, private_data_len);
1887
1888 ret = ib_post_send_mad(msg, NULL);
1889 if (ret) {
1890 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1891 cm_free_msg(msg);
1892 return ret;
1893 }
1894
1895 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1896 return ret;
1897 }
1898 EXPORT_SYMBOL(ib_send_cm_drep);
1899
1900 static int cm_issue_drep(struct cm_port *port,
1901 struct ib_mad_recv_wc *mad_recv_wc)
1902 {
1903 struct ib_mad_send_buf *msg = NULL;
1904 struct cm_dreq_msg *dreq_msg;
1905 struct cm_drep_msg *drep_msg;
1906 int ret;
1907
1908 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1909 if (ret)
1910 return ret;
1911
1912 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
1913 drep_msg = (struct cm_drep_msg *) msg->mad;
1914
1915 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
1916 drep_msg->remote_comm_id = dreq_msg->local_comm_id;
1917 drep_msg->local_comm_id = dreq_msg->remote_comm_id;
1918
1919 ret = ib_post_send_mad(msg, NULL);
1920 if (ret)
1921 cm_free_msg(msg);
1922
1923 return ret;
1924 }
1925
1926 static int cm_dreq_handler(struct cm_work *work)
1927 {
1928 struct cm_id_private *cm_id_priv;
1929 struct cm_dreq_msg *dreq_msg;
1930 struct ib_mad_send_buf *msg = NULL;
1931 unsigned long flags;
1932 int ret;
1933
1934 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
1935 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
1936 dreq_msg->local_comm_id);
1937 if (!cm_id_priv) {
1938 cm_issue_drep(work->port, work->mad_recv_wc);
1939 return -EINVAL;
1940 }
1941
1942 work->cm_event.private_data = &dreq_msg->private_data;
1943
1944 spin_lock_irqsave(&cm_id_priv->lock, flags);
1945 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
1946 goto unlock;
1947
1948 switch (cm_id_priv->id.state) {
1949 case IB_CM_REP_SENT:
1950 case IB_CM_DREQ_SENT:
1951 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1952 break;
1953 case IB_CM_ESTABLISHED:
1954 case IB_CM_MRA_REP_RCVD:
1955 break;
1956 case IB_CM_TIMEWAIT:
1957 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
1958 goto unlock;
1959
1960 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1961 cm_id_priv->private_data,
1962 cm_id_priv->private_data_len);
1963 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1964
1965 if (ib_post_send_mad(msg, NULL))
1966 cm_free_msg(msg);
1967 goto deref;
1968 default:
1969 goto unlock;
1970 }
1971 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
1972 cm_id_priv->tid = dreq_msg->hdr.tid;
1973 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1974 if (!ret)
1975 list_add_tail(&work->list, &cm_id_priv->work_list);
1976 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1977
1978 if (ret)
1979 cm_process_work(cm_id_priv, work);
1980 else
1981 cm_deref_id(cm_id_priv);
1982 return 0;
1983
1984 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1985 deref: cm_deref_id(cm_id_priv);
1986 return -EINVAL;
1987 }
1988
1989 static int cm_drep_handler(struct cm_work *work)
1990 {
1991 struct cm_id_private *cm_id_priv;
1992 struct cm_drep_msg *drep_msg;
1993 unsigned long flags;
1994 int ret;
1995
1996 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
1997 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
1998 drep_msg->local_comm_id);
1999 if (!cm_id_priv)
2000 return -EINVAL;
2001
2002 work->cm_event.private_data = &drep_msg->private_data;
2003
2004 spin_lock_irqsave(&cm_id_priv->lock, flags);
2005 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2006 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2007 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2008 goto out;
2009 }
2010 cm_enter_timewait(cm_id_priv);
2011
2012 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2013 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2014 if (!ret)
2015 list_add_tail(&work->list, &cm_id_priv->work_list);
2016 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2017
2018 if (ret)
2019 cm_process_work(cm_id_priv, work);
2020 else
2021 cm_deref_id(cm_id_priv);
2022 return 0;
2023 out:
2024 cm_deref_id(cm_id_priv);
2025 return -EINVAL;
2026 }
2027
2028 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2029 enum ib_cm_rej_reason reason,
2030 void *ari,
2031 u8 ari_length,
2032 const void *private_data,
2033 u8 private_data_len)
2034 {
2035 struct cm_id_private *cm_id_priv;
2036 struct ib_mad_send_buf *msg;
2037 unsigned long flags;
2038 int ret;
2039
2040 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2041 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2042 return -EINVAL;
2043
2044 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2045
2046 spin_lock_irqsave(&cm_id_priv->lock, flags);
2047 switch (cm_id->state) {
2048 case IB_CM_REQ_SENT:
2049 case IB_CM_MRA_REQ_RCVD:
2050 case IB_CM_REQ_RCVD:
2051 case IB_CM_MRA_REQ_SENT:
2052 case IB_CM_REP_RCVD:
2053 case IB_CM_MRA_REP_SENT:
2054 ret = cm_alloc_msg(cm_id_priv, &msg);
2055 if (!ret)
2056 cm_format_rej((struct cm_rej_msg *) msg->mad,
2057 cm_id_priv, reason, ari, ari_length,
2058 private_data, private_data_len);
2059
2060 cm_reset_to_idle(cm_id_priv);
2061 break;
2062 case IB_CM_REP_SENT:
2063 case IB_CM_MRA_REP_RCVD:
2064 ret = cm_alloc_msg(cm_id_priv, &msg);
2065 if (!ret)
2066 cm_format_rej((struct cm_rej_msg *) msg->mad,
2067 cm_id_priv, reason, ari, ari_length,
2068 private_data, private_data_len);
2069
2070 cm_enter_timewait(cm_id_priv);
2071 break;
2072 default:
2073 ret = -EINVAL;
2074 goto out;
2075 }
2076
2077 if (ret)
2078 goto out;
2079
2080 ret = ib_post_send_mad(msg, NULL);
2081 if (ret)
2082 cm_free_msg(msg);
2083
2084 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2085 return ret;
2086 }
2087 EXPORT_SYMBOL(ib_send_cm_rej);
2088
2089 static void cm_format_rej_event(struct cm_work *work)
2090 {
2091 struct cm_rej_msg *rej_msg;
2092 struct ib_cm_rej_event_param *param;
2093
2094 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2095 param = &work->cm_event.param.rej_rcvd;
2096 param->ari = rej_msg->ari;
2097 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2098 param->reason = __be16_to_cpu(rej_msg->reason);
2099 work->cm_event.private_data = &rej_msg->private_data;
2100 }
2101
2102 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2103 {
2104 struct cm_timewait_info *timewait_info;
2105 struct cm_id_private *cm_id_priv;
2106 unsigned long flags;
2107 __be32 remote_id;
2108
2109 remote_id = rej_msg->local_comm_id;
2110
2111 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2112 spin_lock_irqsave(&cm.lock, flags);
2113 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2114 remote_id);
2115 if (!timewait_info) {
2116 spin_unlock_irqrestore(&cm.lock, flags);
2117 return NULL;
2118 }
2119 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2120 (timewait_info->work.local_id ^
2121 cm.random_id_operand));
2122 if (cm_id_priv) {
2123 if (cm_id_priv->id.remote_id == remote_id)
2124 atomic_inc(&cm_id_priv->refcount);
2125 else
2126 cm_id_priv = NULL;
2127 }
2128 spin_unlock_irqrestore(&cm.lock, flags);
2129 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2130 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2131 else
2132 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2133
2134 return cm_id_priv;
2135 }
2136
2137 static int cm_rej_handler(struct cm_work *work)
2138 {
2139 struct cm_id_private *cm_id_priv;
2140 struct cm_rej_msg *rej_msg;
2141 unsigned long flags;
2142 int ret;
2143
2144 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2145 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2146 if (!cm_id_priv)
2147 return -EINVAL;
2148
2149 cm_format_rej_event(work);
2150
2151 spin_lock_irqsave(&cm_id_priv->lock, flags);
2152 switch (cm_id_priv->id.state) {
2153 case IB_CM_REQ_SENT:
2154 case IB_CM_MRA_REQ_RCVD:
2155 case IB_CM_REP_SENT:
2156 case IB_CM_MRA_REP_RCVD:
2157 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2158 /* fall through */
2159 case IB_CM_REQ_RCVD:
2160 case IB_CM_MRA_REQ_SENT:
2161 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2162 cm_enter_timewait(cm_id_priv);
2163 else
2164 cm_reset_to_idle(cm_id_priv);
2165 break;
2166 case IB_CM_DREQ_SENT:
2167 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2168 /* fall through */
2169 case IB_CM_REP_RCVD:
2170 case IB_CM_MRA_REP_SENT:
2171 case IB_CM_ESTABLISHED:
2172 cm_enter_timewait(cm_id_priv);
2173 break;
2174 default:
2175 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2176 ret = -EINVAL;
2177 goto out;
2178 }
2179
2180 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2181 if (!ret)
2182 list_add_tail(&work->list, &cm_id_priv->work_list);
2183 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2184
2185 if (ret)
2186 cm_process_work(cm_id_priv, work);
2187 else
2188 cm_deref_id(cm_id_priv);
2189 return 0;
2190 out:
2191 cm_deref_id(cm_id_priv);
2192 return -EINVAL;
2193 }
2194
2195 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2196 u8 service_timeout,
2197 const void *private_data,
2198 u8 private_data_len)
2199 {
2200 struct cm_id_private *cm_id_priv;
2201 struct ib_mad_send_buf *msg;
2202 void *data;
2203 unsigned long flags;
2204 int ret;
2205
2206 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2207 return -EINVAL;
2208
2209 data = cm_copy_private_data(private_data, private_data_len);
2210 if (IS_ERR(data))
2211 return PTR_ERR(data);
2212
2213 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2214
2215 spin_lock_irqsave(&cm_id_priv->lock, flags);
2216 switch(cm_id_priv->id.state) {
2217 case IB_CM_REQ_RCVD:
2218 ret = cm_alloc_msg(cm_id_priv, &msg);
2219 if (ret)
2220 goto error1;
2221
2222 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2223 CM_MSG_RESPONSE_REQ, service_timeout,
2224 private_data, private_data_len);
2225 ret = ib_post_send_mad(msg, NULL);
2226 if (ret)
2227 goto error2;
2228 cm_id->state = IB_CM_MRA_REQ_SENT;
2229 break;
2230 case IB_CM_REP_RCVD:
2231 ret = cm_alloc_msg(cm_id_priv, &msg);
2232 if (ret)
2233 goto error1;
2234
2235 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2236 CM_MSG_RESPONSE_REP, service_timeout,
2237 private_data, private_data_len);
2238 ret = ib_post_send_mad(msg, NULL);
2239 if (ret)
2240 goto error2;
2241 cm_id->state = IB_CM_MRA_REP_SENT;
2242 break;
2243 case IB_CM_ESTABLISHED:
2244 ret = cm_alloc_msg(cm_id_priv, &msg);
2245 if (ret)
2246 goto error1;
2247
2248 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2249 CM_MSG_RESPONSE_OTHER, service_timeout,
2250 private_data, private_data_len);
2251 ret = ib_post_send_mad(msg, NULL);
2252 if (ret)
2253 goto error2;
2254 cm_id->lap_state = IB_CM_MRA_LAP_SENT;
2255 break;
2256 default:
2257 ret = -EINVAL;
2258 goto error1;
2259 }
2260 cm_id_priv->service_timeout = service_timeout;
2261 cm_set_private_data(cm_id_priv, data, private_data_len);
2262 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2263 return 0;
2264
2265 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2266 kfree(data);
2267 return ret;
2268
2269 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2270 kfree(data);
2271 cm_free_msg(msg);
2272 return ret;
2273 }
2274 EXPORT_SYMBOL(ib_send_cm_mra);
2275
2276 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2277 {
2278 switch (cm_mra_get_msg_mraed(mra_msg)) {
2279 case CM_MSG_RESPONSE_REQ:
2280 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2281 case CM_MSG_RESPONSE_REP:
2282 case CM_MSG_RESPONSE_OTHER:
2283 return cm_acquire_id(mra_msg->remote_comm_id,
2284 mra_msg->local_comm_id);
2285 default:
2286 return NULL;
2287 }
2288 }
2289
2290 static int cm_mra_handler(struct cm_work *work)
2291 {
2292 struct cm_id_private *cm_id_priv;
2293 struct cm_mra_msg *mra_msg;
2294 unsigned long flags;
2295 int timeout, ret;
2296
2297 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2298 cm_id_priv = cm_acquire_mraed_id(mra_msg);
2299 if (!cm_id_priv)
2300 return -EINVAL;
2301
2302 work->cm_event.private_data = &mra_msg->private_data;
2303 work->cm_event.param.mra_rcvd.service_timeout =
2304 cm_mra_get_service_timeout(mra_msg);
2305 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2306 cm_convert_to_ms(cm_id_priv->av.packet_life_time);
2307
2308 spin_lock_irqsave(&cm_id_priv->lock, flags);
2309 switch (cm_id_priv->id.state) {
2310 case IB_CM_REQ_SENT:
2311 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2312 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2313 cm_id_priv->msg, timeout))
2314 goto out;
2315 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2316 break;
2317 case IB_CM_REP_SENT:
2318 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2319 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2320 cm_id_priv->msg, timeout))
2321 goto out;
2322 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2323 break;
2324 case IB_CM_ESTABLISHED:
2325 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2326 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2327 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2328 cm_id_priv->msg, timeout))
2329 goto out;
2330 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2331 break;
2332 default:
2333 goto out;
2334 }
2335
2336 cm_id_priv->msg->context[1] = (void *) (unsigned long)
2337 cm_id_priv->id.state;
2338 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2339 if (!ret)
2340 list_add_tail(&work->list, &cm_id_priv->work_list);
2341 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2342
2343 if (ret)
2344 cm_process_work(cm_id_priv, work);
2345 else
2346 cm_deref_id(cm_id_priv);
2347 return 0;
2348 out:
2349 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2350 cm_deref_id(cm_id_priv);
2351 return -EINVAL;
2352 }
2353
2354 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2355 struct cm_id_private *cm_id_priv,
2356 struct ib_sa_path_rec *alternate_path,
2357 const void *private_data,
2358 u8 private_data_len)
2359 {
2360 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2361 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2362 lap_msg->local_comm_id = cm_id_priv->id.local_id;
2363 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2364 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2365 /* todo: need remote CM response timeout */
2366 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2367 lap_msg->alt_local_lid = alternate_path->slid;
2368 lap_msg->alt_remote_lid = alternate_path->dlid;
2369 lap_msg->alt_local_gid = alternate_path->sgid;
2370 lap_msg->alt_remote_gid = alternate_path->dgid;
2371 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2372 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2373 lap_msg->alt_hop_limit = alternate_path->hop_limit;
2374 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2375 cm_lap_set_sl(lap_msg, alternate_path->sl);
2376 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2377 cm_lap_set_local_ack_timeout(lap_msg,
2378 min(31, alternate_path->packet_life_time + 1));
2379
2380 if (private_data && private_data_len)
2381 memcpy(lap_msg->private_data, private_data, private_data_len);
2382 }
2383
2384 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2385 struct ib_sa_path_rec *alternate_path,
2386 const void *private_data,
2387 u8 private_data_len)
2388 {
2389 struct cm_id_private *cm_id_priv;
2390 struct ib_mad_send_buf *msg;
2391 unsigned long flags;
2392 int ret;
2393
2394 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2395 return -EINVAL;
2396
2397 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2398 spin_lock_irqsave(&cm_id_priv->lock, flags);
2399 if (cm_id->state != IB_CM_ESTABLISHED ||
2400 (cm_id->lap_state != IB_CM_LAP_UNINIT &&
2401 cm_id->lap_state != IB_CM_LAP_IDLE)) {
2402 ret = -EINVAL;
2403 goto out;
2404 }
2405
2406 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av);
2407 if (ret)
2408 goto out;
2409
2410 ret = cm_alloc_msg(cm_id_priv, &msg);
2411 if (ret)
2412 goto out;
2413
2414 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2415 alternate_path, private_data, private_data_len);
2416 msg->timeout_ms = cm_id_priv->timeout_ms;
2417 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2418
2419 ret = ib_post_send_mad(msg, NULL);
2420 if (ret) {
2421 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2422 cm_free_msg(msg);
2423 return ret;
2424 }
2425
2426 cm_id->lap_state = IB_CM_LAP_SENT;
2427 cm_id_priv->msg = msg;
2428
2429 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2430 return ret;
2431 }
2432 EXPORT_SYMBOL(ib_send_cm_lap);
2433
2434 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
2435 struct ib_sa_path_rec *path,
2436 struct cm_lap_msg *lap_msg)
2437 {
2438 memset(path, 0, sizeof *path);
2439 path->dgid = lap_msg->alt_local_gid;
2440 path->sgid = lap_msg->alt_remote_gid;
2441 path->dlid = lap_msg->alt_local_lid;
2442 path->slid = lap_msg->alt_remote_lid;
2443 path->flow_label = cm_lap_get_flow_label(lap_msg);
2444 path->hop_limit = lap_msg->alt_hop_limit;
2445 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2446 path->reversible = 1;
2447 path->pkey = cm_id_priv->pkey;
2448 path->sl = cm_lap_get_sl(lap_msg);
2449 path->mtu_selector = IB_SA_EQ;
2450 path->mtu = cm_id_priv->path_mtu;
2451 path->rate_selector = IB_SA_EQ;
2452 path->rate = cm_lap_get_packet_rate(lap_msg);
2453 path->packet_life_time_selector = IB_SA_EQ;
2454 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2455 path->packet_life_time -= (path->packet_life_time > 0);
2456 }
2457
2458 static int cm_lap_handler(struct cm_work *work)
2459 {
2460 struct cm_id_private *cm_id_priv;
2461 struct cm_lap_msg *lap_msg;
2462 struct ib_cm_lap_event_param *param;
2463 struct ib_mad_send_buf *msg = NULL;
2464 unsigned long flags;
2465 int ret;
2466
2467 /* todo: verify LAP request and send reject APR if invalid. */
2468 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2469 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2470 lap_msg->local_comm_id);
2471 if (!cm_id_priv)
2472 return -EINVAL;
2473
2474 param = &work->cm_event.param.lap_rcvd;
2475 param->alternate_path = &work->path[0];
2476 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
2477 work->cm_event.private_data = &lap_msg->private_data;
2478
2479 spin_lock_irqsave(&cm_id_priv->lock, flags);
2480 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2481 goto unlock;
2482
2483 switch (cm_id_priv->id.lap_state) {
2484 case IB_CM_LAP_UNINIT:
2485 case IB_CM_LAP_IDLE:
2486 break;
2487 case IB_CM_MRA_LAP_SENT:
2488 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2489 goto unlock;
2490
2491 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2492 CM_MSG_RESPONSE_OTHER,
2493 cm_id_priv->service_timeout,
2494 cm_id_priv->private_data,
2495 cm_id_priv->private_data_len);
2496 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2497
2498 if (ib_post_send_mad(msg, NULL))
2499 cm_free_msg(msg);
2500 goto deref;
2501 default:
2502 goto unlock;
2503 }
2504
2505 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2506 cm_id_priv->tid = lap_msg->hdr.tid;
2507 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2508 work->mad_recv_wc->recv_buf.grh,
2509 &cm_id_priv->av);
2510 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av);
2511 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2512 if (!ret)
2513 list_add_tail(&work->list, &cm_id_priv->work_list);
2514 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2515
2516 if (ret)
2517 cm_process_work(cm_id_priv, work);
2518 else
2519 cm_deref_id(cm_id_priv);
2520 return 0;
2521
2522 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2523 deref: cm_deref_id(cm_id_priv);
2524 return -EINVAL;
2525 }
2526
2527 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2528 struct cm_id_private *cm_id_priv,
2529 enum ib_cm_apr_status status,
2530 void *info,
2531 u8 info_length,
2532 const void *private_data,
2533 u8 private_data_len)
2534 {
2535 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2536 apr_msg->local_comm_id = cm_id_priv->id.local_id;
2537 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2538 apr_msg->ap_status = (u8) status;
2539
2540 if (info && info_length) {
2541 apr_msg->info_length = info_length;
2542 memcpy(apr_msg->info, info, info_length);
2543 }
2544
2545 if (private_data && private_data_len)
2546 memcpy(apr_msg->private_data, private_data, private_data_len);
2547 }
2548
2549 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2550 enum ib_cm_apr_status status,
2551 void *info,
2552 u8 info_length,
2553 const void *private_data,
2554 u8 private_data_len)
2555 {
2556 struct cm_id_private *cm_id_priv;
2557 struct ib_mad_send_buf *msg;
2558 unsigned long flags;
2559 int ret;
2560
2561 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2562 (info && info_length > IB_CM_APR_INFO_LENGTH))
2563 return -EINVAL;
2564
2565 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2566 spin_lock_irqsave(&cm_id_priv->lock, flags);
2567 if (cm_id->state != IB_CM_ESTABLISHED ||
2568 (cm_id->lap_state != IB_CM_LAP_RCVD &&
2569 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2570 ret = -EINVAL;
2571 goto out;
2572 }
2573
2574 ret = cm_alloc_msg(cm_id_priv, &msg);
2575 if (ret)
2576 goto out;
2577
2578 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2579 info, info_length, private_data, private_data_len);
2580 ret = ib_post_send_mad(msg, NULL);
2581 if (ret) {
2582 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2583 cm_free_msg(msg);
2584 return ret;
2585 }
2586
2587 cm_id->lap_state = IB_CM_LAP_IDLE;
2588 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2589 return ret;
2590 }
2591 EXPORT_SYMBOL(ib_send_cm_apr);
2592
2593 static int cm_apr_handler(struct cm_work *work)
2594 {
2595 struct cm_id_private *cm_id_priv;
2596 struct cm_apr_msg *apr_msg;
2597 unsigned long flags;
2598 int ret;
2599
2600 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2601 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2602 apr_msg->local_comm_id);
2603 if (!cm_id_priv)
2604 return -EINVAL; /* Unmatched reply. */
2605
2606 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2607 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2608 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2609 work->cm_event.private_data = &apr_msg->private_data;
2610
2611 spin_lock_irqsave(&cm_id_priv->lock, flags);
2612 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2613 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2614 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2615 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2616 goto out;
2617 }
2618 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2619 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2620 cm_id_priv->msg = NULL;
2621
2622 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2623 if (!ret)
2624 list_add_tail(&work->list, &cm_id_priv->work_list);
2625 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2626
2627 if (ret)
2628 cm_process_work(cm_id_priv, work);
2629 else
2630 cm_deref_id(cm_id_priv);
2631 return 0;
2632 out:
2633 cm_deref_id(cm_id_priv);
2634 return -EINVAL;
2635 }
2636
2637 static int cm_timewait_handler(struct cm_work *work)
2638 {
2639 struct cm_timewait_info *timewait_info;
2640 struct cm_id_private *cm_id_priv;
2641 int ret;
2642
2643 timewait_info = (struct cm_timewait_info *)work;
2644 spin_lock_irq(&cm.lock);
2645 list_del(&timewait_info->list);
2646 spin_unlock_irq(&cm.lock);
2647
2648 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2649 timewait_info->work.remote_id);
2650 if (!cm_id_priv)
2651 return -EINVAL;
2652
2653 spin_lock_irq(&cm_id_priv->lock);
2654 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2655 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2656 spin_unlock_irq(&cm_id_priv->lock);
2657 goto out;
2658 }
2659 cm_id_priv->id.state = IB_CM_IDLE;
2660 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2661 if (!ret)
2662 list_add_tail(&work->list, &cm_id_priv->work_list);
2663 spin_unlock_irq(&cm_id_priv->lock);
2664
2665 if (ret)
2666 cm_process_work(cm_id_priv, work);
2667 else
2668 cm_deref_id(cm_id_priv);
2669 return 0;
2670 out:
2671 cm_deref_id(cm_id_priv);
2672 return -EINVAL;
2673 }
2674
2675 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2676 struct cm_id_private *cm_id_priv,
2677 struct ib_cm_sidr_req_param *param)
2678 {
2679 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2680 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2681 sidr_req_msg->request_id = cm_id_priv->id.local_id;
2682 sidr_req_msg->pkey = cpu_to_be16(param->path->pkey);
2683 sidr_req_msg->service_id = param->service_id;
2684
2685 if (param->private_data && param->private_data_len)
2686 memcpy(sidr_req_msg->private_data, param->private_data,
2687 param->private_data_len);
2688 }
2689
2690 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2691 struct ib_cm_sidr_req_param *param)
2692 {
2693 struct cm_id_private *cm_id_priv;
2694 struct ib_mad_send_buf *msg;
2695 unsigned long flags;
2696 int ret;
2697
2698 if (!param->path || (param->private_data &&
2699 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2700 return -EINVAL;
2701
2702 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2703 ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2704 if (ret)
2705 goto out;
2706
2707 cm_id->service_id = param->service_id;
2708 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
2709 cm_id_priv->timeout_ms = param->timeout_ms;
2710 cm_id_priv->max_cm_retries = param->max_cm_retries;
2711 ret = cm_alloc_msg(cm_id_priv, &msg);
2712 if (ret)
2713 goto out;
2714
2715 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2716 param);
2717 msg->timeout_ms = cm_id_priv->timeout_ms;
2718 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2719
2720 spin_lock_irqsave(&cm_id_priv->lock, flags);
2721 if (cm_id->state == IB_CM_IDLE)
2722 ret = ib_post_send_mad(msg, NULL);
2723 else
2724 ret = -EINVAL;
2725
2726 if (ret) {
2727 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2728 cm_free_msg(msg);
2729 goto out;
2730 }
2731 cm_id->state = IB_CM_SIDR_REQ_SENT;
2732 cm_id_priv->msg = msg;
2733 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2734 out:
2735 return ret;
2736 }
2737 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2738
2739 static void cm_format_sidr_req_event(struct cm_work *work,
2740 struct ib_cm_id *listen_id)
2741 {
2742 struct cm_sidr_req_msg *sidr_req_msg;
2743 struct ib_cm_sidr_req_event_param *param;
2744
2745 sidr_req_msg = (struct cm_sidr_req_msg *)
2746 work->mad_recv_wc->recv_buf.mad;
2747 param = &work->cm_event.param.sidr_req_rcvd;
2748 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2749 param->listen_id = listen_id;
2750 param->port = work->port->port_num;
2751 work->cm_event.private_data = &sidr_req_msg->private_data;
2752 }
2753
2754 static int cm_sidr_req_handler(struct cm_work *work)
2755 {
2756 struct ib_cm_id *cm_id;
2757 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2758 struct cm_sidr_req_msg *sidr_req_msg;
2759 struct ib_wc *wc;
2760 unsigned long flags;
2761
2762 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
2763 if (IS_ERR(cm_id))
2764 return PTR_ERR(cm_id);
2765 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2766
2767 /* Record SGID/SLID and request ID for lookup. */
2768 sidr_req_msg = (struct cm_sidr_req_msg *)
2769 work->mad_recv_wc->recv_buf.mad;
2770 wc = work->mad_recv_wc->wc;
2771 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2772 cm_id_priv->av.dgid.global.interface_id = 0;
2773 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2774 work->mad_recv_wc->recv_buf.grh,
2775 &cm_id_priv->av);
2776 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2777 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
2778 cm_id_priv->tid = sidr_req_msg->hdr.tid;
2779 atomic_inc(&cm_id_priv->work_count);
2780
2781 spin_lock_irqsave(&cm.lock, flags);
2782 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2783 if (cur_cm_id_priv) {
2784 spin_unlock_irqrestore(&cm.lock, flags);
2785 goto out; /* Duplicate message. */
2786 }
2787 cur_cm_id_priv = cm_find_listen(cm_id->device,
2788 sidr_req_msg->service_id,
2789 sidr_req_msg->private_data);
2790 if (!cur_cm_id_priv) {
2791 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2792 spin_unlock_irqrestore(&cm.lock, flags);
2793 /* todo: reply with no match */
2794 goto out; /* No match. */
2795 }
2796 atomic_inc(&cur_cm_id_priv->refcount);
2797 spin_unlock_irqrestore(&cm.lock, flags);
2798
2799 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2800 cm_id_priv->id.context = cur_cm_id_priv->id.context;
2801 cm_id_priv->id.service_id = sidr_req_msg->service_id;
2802 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
2803
2804 cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2805 cm_process_work(cm_id_priv, work);
2806 cm_deref_id(cur_cm_id_priv);
2807 return 0;
2808 out:
2809 ib_destroy_cm_id(&cm_id_priv->id);
2810 return -EINVAL;
2811 }
2812
2813 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
2814 struct cm_id_private *cm_id_priv,
2815 struct ib_cm_sidr_rep_param *param)
2816 {
2817 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
2818 cm_id_priv->tid);
2819 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
2820 sidr_rep_msg->status = param->status;
2821 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
2822 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
2823 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
2824
2825 if (param->info && param->info_length)
2826 memcpy(sidr_rep_msg->info, param->info, param->info_length);
2827
2828 if (param->private_data && param->private_data_len)
2829 memcpy(sidr_rep_msg->private_data, param->private_data,
2830 param->private_data_len);
2831 }
2832
2833 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
2834 struct ib_cm_sidr_rep_param *param)
2835 {
2836 struct cm_id_private *cm_id_priv;
2837 struct ib_mad_send_buf *msg;
2838 unsigned long flags;
2839 int ret;
2840
2841 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
2842 (param->private_data &&
2843 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
2844 return -EINVAL;
2845
2846 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2847 spin_lock_irqsave(&cm_id_priv->lock, flags);
2848 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
2849 ret = -EINVAL;
2850 goto error;
2851 }
2852
2853 ret = cm_alloc_msg(cm_id_priv, &msg);
2854 if (ret)
2855 goto error;
2856
2857 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
2858 param);
2859 ret = ib_post_send_mad(msg, NULL);
2860 if (ret) {
2861 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2862 cm_free_msg(msg);
2863 return ret;
2864 }
2865 cm_id->state = IB_CM_IDLE;
2866 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2867
2868 spin_lock_irqsave(&cm.lock, flags);
2869 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2870 spin_unlock_irqrestore(&cm.lock, flags);
2871 return 0;
2872
2873 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2874 return ret;
2875 }
2876 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
2877
2878 static void cm_format_sidr_rep_event(struct cm_work *work)
2879 {
2880 struct cm_sidr_rep_msg *sidr_rep_msg;
2881 struct ib_cm_sidr_rep_event_param *param;
2882
2883 sidr_rep_msg = (struct cm_sidr_rep_msg *)
2884 work->mad_recv_wc->recv_buf.mad;
2885 param = &work->cm_event.param.sidr_rep_rcvd;
2886 param->status = sidr_rep_msg->status;
2887 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
2888 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
2889 param->info = &sidr_rep_msg->info;
2890 param->info_len = sidr_rep_msg->info_length;
2891 work->cm_event.private_data = &sidr_rep_msg->private_data;
2892 }
2893
2894 static int cm_sidr_rep_handler(struct cm_work *work)
2895 {
2896 struct cm_sidr_rep_msg *sidr_rep_msg;
2897 struct cm_id_private *cm_id_priv;
2898 unsigned long flags;
2899
2900 sidr_rep_msg = (struct cm_sidr_rep_msg *)
2901 work->mad_recv_wc->recv_buf.mad;
2902 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
2903 if (!cm_id_priv)
2904 return -EINVAL; /* Unmatched reply. */
2905
2906 spin_lock_irqsave(&cm_id_priv->lock, flags);
2907 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
2908 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2909 goto out;
2910 }
2911 cm_id_priv->id.state = IB_CM_IDLE;
2912 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2913 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2914
2915 cm_format_sidr_rep_event(work);
2916 cm_process_work(cm_id_priv, work);
2917 return 0;
2918 out:
2919 cm_deref_id(cm_id_priv);
2920 return -EINVAL;
2921 }
2922
2923 static void cm_process_send_error(struct ib_mad_send_buf *msg,
2924 enum ib_wc_status wc_status)
2925 {
2926 struct cm_id_private *cm_id_priv;
2927 struct ib_cm_event cm_event;
2928 enum ib_cm_state state;
2929 unsigned long flags;
2930 int ret;
2931
2932 memset(&cm_event, 0, sizeof cm_event);
2933 cm_id_priv = msg->context[0];
2934
2935 /* Discard old sends or ones without a response. */
2936 spin_lock_irqsave(&cm_id_priv->lock, flags);
2937 state = (enum ib_cm_state) (unsigned long) msg->context[1];
2938 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
2939 goto discard;
2940
2941 switch (state) {
2942 case IB_CM_REQ_SENT:
2943 case IB_CM_MRA_REQ_RCVD:
2944 cm_reset_to_idle(cm_id_priv);
2945 cm_event.event = IB_CM_REQ_ERROR;
2946 break;
2947 case IB_CM_REP_SENT:
2948 case IB_CM_MRA_REP_RCVD:
2949 cm_reset_to_idle(cm_id_priv);
2950 cm_event.event = IB_CM_REP_ERROR;
2951 break;
2952 case IB_CM_DREQ_SENT:
2953 cm_enter_timewait(cm_id_priv);
2954 cm_event.event = IB_CM_DREQ_ERROR;
2955 break;
2956 case IB_CM_SIDR_REQ_SENT:
2957 cm_id_priv->id.state = IB_CM_IDLE;
2958 cm_event.event = IB_CM_SIDR_REQ_ERROR;
2959 break;
2960 default:
2961 goto discard;
2962 }
2963 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2964 cm_event.param.send_status = wc_status;
2965
2966 /* No other events can occur on the cm_id at this point. */
2967 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
2968 cm_free_msg(msg);
2969 if (ret)
2970 ib_destroy_cm_id(&cm_id_priv->id);
2971 return;
2972 discard:
2973 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2974 cm_free_msg(msg);
2975 }
2976
2977 static void cm_send_handler(struct ib_mad_agent *mad_agent,
2978 struct ib_mad_send_wc *mad_send_wc)
2979 {
2980 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
2981
2982 switch (mad_send_wc->status) {
2983 case IB_WC_SUCCESS:
2984 case IB_WC_WR_FLUSH_ERR:
2985 cm_free_msg(msg);
2986 break;
2987 default:
2988 if (msg->context[0] && msg->context[1])
2989 cm_process_send_error(msg, mad_send_wc->status);
2990 else
2991 cm_free_msg(msg);
2992 break;
2993 }
2994 }
2995
2996 static void cm_work_handler(struct work_struct *_work)
2997 {
2998 struct cm_work *work = container_of(_work, struct cm_work, work.work);
2999 int ret;
3000
3001 switch (work->cm_event.event) {
3002 case IB_CM_REQ_RECEIVED:
3003 ret = cm_req_handler(work);
3004 break;
3005 case IB_CM_MRA_RECEIVED:
3006 ret = cm_mra_handler(work);
3007 break;
3008 case IB_CM_REJ_RECEIVED:
3009 ret = cm_rej_handler(work);
3010 break;
3011 case IB_CM_REP_RECEIVED:
3012 ret = cm_rep_handler(work);
3013 break;
3014 case IB_CM_RTU_RECEIVED:
3015 ret = cm_rtu_handler(work);
3016 break;
3017 case IB_CM_USER_ESTABLISHED:
3018 ret = cm_establish_handler(work);
3019 break;
3020 case IB_CM_DREQ_RECEIVED:
3021 ret = cm_dreq_handler(work);
3022 break;
3023 case IB_CM_DREP_RECEIVED:
3024 ret = cm_drep_handler(work);
3025 break;
3026 case IB_CM_SIDR_REQ_RECEIVED:
3027 ret = cm_sidr_req_handler(work);
3028 break;
3029 case IB_CM_SIDR_REP_RECEIVED:
3030 ret = cm_sidr_rep_handler(work);
3031 break;
3032 case IB_CM_LAP_RECEIVED:
3033 ret = cm_lap_handler(work);
3034 break;
3035 case IB_CM_APR_RECEIVED:
3036 ret = cm_apr_handler(work);
3037 break;
3038 case IB_CM_TIMEWAIT_EXIT:
3039 ret = cm_timewait_handler(work);
3040 break;
3041 default:
3042 ret = -EINVAL;
3043 break;
3044 }
3045 if (ret)
3046 cm_free_work(work);
3047 }
3048
3049 static int cm_establish(struct ib_cm_id *cm_id)
3050 {
3051 struct cm_id_private *cm_id_priv;
3052 struct cm_work *work;
3053 unsigned long flags;
3054 int ret = 0;
3055
3056 work = kmalloc(sizeof *work, GFP_ATOMIC);
3057 if (!work)
3058 return -ENOMEM;
3059
3060 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3061 spin_lock_irqsave(&cm_id_priv->lock, flags);
3062 switch (cm_id->state)
3063 {
3064 case IB_CM_REP_SENT:
3065 case IB_CM_MRA_REP_RCVD:
3066 cm_id->state = IB_CM_ESTABLISHED;
3067 break;
3068 case IB_CM_ESTABLISHED:
3069 ret = -EISCONN;
3070 break;
3071 default:
3072 ret = -EINVAL;
3073 break;
3074 }
3075 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3076
3077 if (ret) {
3078 kfree(work);
3079 goto out;
3080 }
3081
3082 /*
3083 * The CM worker thread may try to destroy the cm_id before it
3084 * can execute this work item. To prevent potential deadlock,
3085 * we need to find the cm_id once we're in the context of the
3086 * worker thread, rather than holding a reference on it.
3087 */
3088 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3089 work->local_id = cm_id->local_id;
3090 work->remote_id = cm_id->remote_id;
3091 work->mad_recv_wc = NULL;
3092 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3093 queue_delayed_work(cm.wq, &work->work, 0);
3094 out:
3095 return ret;
3096 }
3097
3098 static int cm_migrate(struct ib_cm_id *cm_id)
3099 {
3100 struct cm_id_private *cm_id_priv;
3101 unsigned long flags;
3102 int ret = 0;
3103
3104 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3105 spin_lock_irqsave(&cm_id_priv->lock, flags);
3106 if (cm_id->state == IB_CM_ESTABLISHED &&
3107 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3108 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3109 cm_id->lap_state = IB_CM_LAP_IDLE;
3110 cm_id_priv->av = cm_id_priv->alt_av;
3111 } else
3112 ret = -EINVAL;
3113 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3114
3115 return ret;
3116 }
3117
3118 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3119 {
3120 int ret;
3121
3122 switch (event) {
3123 case IB_EVENT_COMM_EST:
3124 ret = cm_establish(cm_id);
3125 break;
3126 case IB_EVENT_PATH_MIG:
3127 ret = cm_migrate(cm_id);
3128 break;
3129 default:
3130 ret = -EINVAL;
3131 }
3132 return ret;
3133 }
3134 EXPORT_SYMBOL(ib_cm_notify);
3135
3136 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3137 struct ib_mad_recv_wc *mad_recv_wc)
3138 {
3139 struct cm_work *work;
3140 enum ib_cm_event_type event;
3141 int paths = 0;
3142
3143 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3144 case CM_REQ_ATTR_ID:
3145 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3146 alt_local_lid != 0);
3147 event = IB_CM_REQ_RECEIVED;
3148 break;
3149 case CM_MRA_ATTR_ID:
3150 event = IB_CM_MRA_RECEIVED;
3151 break;
3152 case CM_REJ_ATTR_ID:
3153 event = IB_CM_REJ_RECEIVED;
3154 break;
3155 case CM_REP_ATTR_ID:
3156 event = IB_CM_REP_RECEIVED;
3157 break;
3158 case CM_RTU_ATTR_ID:
3159 event = IB_CM_RTU_RECEIVED;
3160 break;
3161 case CM_DREQ_ATTR_ID:
3162 event = IB_CM_DREQ_RECEIVED;
3163 break;
3164 case CM_DREP_ATTR_ID:
3165 event = IB_CM_DREP_RECEIVED;
3166 break;
3167 case CM_SIDR_REQ_ATTR_ID:
3168 event = IB_CM_SIDR_REQ_RECEIVED;
3169 break;
3170 case CM_SIDR_REP_ATTR_ID:
3171 event = IB_CM_SIDR_REP_RECEIVED;
3172 break;
3173 case CM_LAP_ATTR_ID:
3174 paths = 1;
3175 event = IB_CM_LAP_RECEIVED;
3176 break;
3177 case CM_APR_ATTR_ID:
3178 event = IB_CM_APR_RECEIVED;
3179 break;
3180 default:
3181 ib_free_recv_mad(mad_recv_wc);
3182 return;
3183 }
3184
3185 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3186 GFP_KERNEL);
3187 if (!work) {
3188 ib_free_recv_mad(mad_recv_wc);
3189 return;
3190 }
3191
3192 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3193 work->cm_event.event = event;
3194 work->mad_recv_wc = mad_recv_wc;
3195 work->port = (struct cm_port *)mad_agent->context;
3196 queue_delayed_work(cm.wq, &work->work, 0);
3197 }
3198
3199 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3200 struct ib_qp_attr *qp_attr,
3201 int *qp_attr_mask)
3202 {
3203 unsigned long flags;
3204 int ret;
3205
3206 spin_lock_irqsave(&cm_id_priv->lock, flags);
3207 switch (cm_id_priv->id.state) {
3208 case IB_CM_REQ_SENT:
3209 case IB_CM_MRA_REQ_RCVD:
3210 case IB_CM_REQ_RCVD:
3211 case IB_CM_MRA_REQ_SENT:
3212 case IB_CM_REP_RCVD:
3213 case IB_CM_MRA_REP_SENT:
3214 case IB_CM_REP_SENT:
3215 case IB_CM_MRA_REP_RCVD:
3216 case IB_CM_ESTABLISHED:
3217 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3218 IB_QP_PKEY_INDEX | IB_QP_PORT;
3219 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
3220 if (cm_id_priv->responder_resources)
3221 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3222 IB_ACCESS_REMOTE_ATOMIC;
3223 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3224 qp_attr->port_num = cm_id_priv->av.port->port_num;
3225 ret = 0;
3226 break;
3227 default:
3228 ret = -EINVAL;
3229 break;
3230 }
3231 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3232 return ret;
3233 }
3234
3235 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3236 struct ib_qp_attr *qp_attr,
3237 int *qp_attr_mask)
3238 {
3239 unsigned long flags;
3240 int ret;
3241
3242 spin_lock_irqsave(&cm_id_priv->lock, flags);
3243 switch (cm_id_priv->id.state) {
3244 case IB_CM_REQ_RCVD:
3245 case IB_CM_MRA_REQ_SENT:
3246 case IB_CM_REP_RCVD:
3247 case IB_CM_MRA_REP_SENT:
3248 case IB_CM_REP_SENT:
3249 case IB_CM_MRA_REP_RCVD:
3250 case IB_CM_ESTABLISHED:
3251 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3252 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3253 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3254 qp_attr->path_mtu = cm_id_priv->path_mtu;
3255 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3256 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3257 if (cm_id_priv->qp_type == IB_QPT_RC) {
3258 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3259 IB_QP_MIN_RNR_TIMER;
3260 qp_attr->max_dest_rd_atomic =
3261 cm_id_priv->responder_resources;
3262 qp_attr->min_rnr_timer = 0;
3263 }
3264 if (cm_id_priv->alt_av.ah_attr.dlid) {
3265 *qp_attr_mask |= IB_QP_ALT_PATH;
3266 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3267 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3268 qp_attr->alt_timeout =
3269 cm_id_priv->alt_av.packet_life_time + 1;
3270 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3271 }
3272 ret = 0;
3273 break;
3274 default:
3275 ret = -EINVAL;
3276 break;
3277 }
3278 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3279 return ret;
3280 }
3281
3282 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3283 struct ib_qp_attr *qp_attr,
3284 int *qp_attr_mask)
3285 {
3286 unsigned long flags;
3287 int ret;
3288
3289 spin_lock_irqsave(&cm_id_priv->lock, flags);
3290 switch (cm_id_priv->id.state) {
3291 /* Allow transition to RTS before sending REP */
3292 case IB_CM_REQ_RCVD:
3293 case IB_CM_MRA_REQ_SENT:
3294
3295 case IB_CM_REP_RCVD:
3296 case IB_CM_MRA_REP_SENT:
3297 case IB_CM_REP_SENT:
3298 case IB_CM_MRA_REP_RCVD:
3299 case IB_CM_ESTABLISHED:
3300 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
3301 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3302 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3303 if (cm_id_priv->qp_type == IB_QPT_RC) {
3304 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3305 IB_QP_RNR_RETRY |
3306 IB_QP_MAX_QP_RD_ATOMIC;
3307 qp_attr->timeout =
3308 cm_id_priv->av.packet_life_time + 1;
3309 qp_attr->retry_cnt = cm_id_priv->retry_count;
3310 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3311 qp_attr->max_rd_atomic =
3312 cm_id_priv->initiator_depth;
3313 }
3314 if (cm_id_priv->alt_av.ah_attr.dlid) {
3315 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3316 qp_attr->path_mig_state = IB_MIG_REARM;
3317 }
3318 } else {
3319 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
3320 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3321 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3322 qp_attr->alt_timeout =
3323 cm_id_priv->alt_av.packet_life_time + 1;
3324 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3325 qp_attr->path_mig_state = IB_MIG_REARM;
3326 }
3327 ret = 0;
3328 break;
3329 default:
3330 ret = -EINVAL;
3331 break;
3332 }
3333 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3334 return ret;
3335 }
3336
3337 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3338 struct ib_qp_attr *qp_attr,
3339 int *qp_attr_mask)
3340 {
3341 struct cm_id_private *cm_id_priv;
3342 int ret;
3343
3344 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3345 switch (qp_attr->qp_state) {
3346 case IB_QPS_INIT:
3347 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3348 break;
3349 case IB_QPS_RTR:
3350 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3351 break;
3352 case IB_QPS_RTS:
3353 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3354 break;
3355 default:
3356 ret = -EINVAL;
3357 break;
3358 }
3359 return ret;
3360 }
3361 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3362
3363 static void cm_add_one(struct ib_device *device)
3364 {
3365 struct cm_device *cm_dev;
3366 struct cm_port *port;
3367 struct ib_mad_reg_req reg_req = {
3368 .mgmt_class = IB_MGMT_CLASS_CM,
3369 .mgmt_class_version = IB_CM_CLASS_VERSION
3370 };
3371 struct ib_port_modify port_modify = {
3372 .set_port_cap_mask = IB_PORT_CM_SUP
3373 };
3374 unsigned long flags;
3375 int ret;
3376 u8 i;
3377
3378 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
3379 return;
3380
3381 cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) *
3382 device->phys_port_cnt, GFP_KERNEL);
3383 if (!cm_dev)
3384 return;
3385
3386 cm_dev->device = device;
3387
3388 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3389 for (i = 1; i <= device->phys_port_cnt; i++) {
3390 port = &cm_dev->port[i-1];
3391 port->cm_dev = cm_dev;
3392 port->port_num = i;
3393 port->mad_agent = ib_register_mad_agent(device, i,
3394 IB_QPT_GSI,
3395 &reg_req,
3396 0,
3397 cm_send_handler,
3398 cm_recv_handler,
3399 port);
3400 if (IS_ERR(port->mad_agent))
3401 goto error1;
3402
3403 ret = ib_modify_port(device, i, 0, &port_modify);
3404 if (ret)
3405 goto error2;
3406 }
3407 ib_set_client_data(device, &cm_client, cm_dev);
3408
3409 write_lock_irqsave(&cm.device_lock, flags);
3410 list_add_tail(&cm_dev->list, &cm.device_list);
3411 write_unlock_irqrestore(&cm.device_lock, flags);
3412 return;
3413
3414 error2:
3415 ib_unregister_mad_agent(port->mad_agent);
3416 error1:
3417 port_modify.set_port_cap_mask = 0;
3418 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3419 while (--i) {
3420 port = &cm_dev->port[i-1];
3421 ib_modify_port(device, port->port_num, 0, &port_modify);
3422 ib_unregister_mad_agent(port->mad_agent);
3423 }
3424 kfree(cm_dev);
3425 }
3426
3427 static void cm_remove_one(struct ib_device *device)
3428 {
3429 struct cm_device *cm_dev;
3430 struct cm_port *port;
3431 struct ib_port_modify port_modify = {
3432 .clr_port_cap_mask = IB_PORT_CM_SUP
3433 };
3434 unsigned long flags;
3435 int i;
3436
3437 cm_dev = ib_get_client_data(device, &cm_client);
3438 if (!cm_dev)
3439 return;
3440
3441 write_lock_irqsave(&cm.device_lock, flags);
3442 list_del(&cm_dev->list);
3443 write_unlock_irqrestore(&cm.device_lock, flags);
3444
3445 for (i = 1; i <= device->phys_port_cnt; i++) {
3446 port = &cm_dev->port[i-1];
3447 ib_modify_port(device, port->port_num, 0, &port_modify);
3448 ib_unregister_mad_agent(port->mad_agent);
3449 }
3450 kfree(cm_dev);
3451 }
3452
3453 static int __init ib_cm_init(void)
3454 {
3455 int ret;
3456
3457 memset(&cm, 0, sizeof cm);
3458 INIT_LIST_HEAD(&cm.device_list);
3459 rwlock_init(&cm.device_lock);
3460 spin_lock_init(&cm.lock);
3461 cm.listen_service_table = RB_ROOT;
3462 cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3463 cm.remote_id_table = RB_ROOT;
3464 cm.remote_qp_table = RB_ROOT;
3465 cm.remote_sidr_table = RB_ROOT;
3466 idr_init(&cm.local_id_table);
3467 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3468 idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3469 INIT_LIST_HEAD(&cm.timewait_list);
3470
3471 cm.wq = create_workqueue("ib_cm");
3472 if (!cm.wq)
3473 return -ENOMEM;
3474
3475 ret = ib_register_client(&cm_client);
3476 if (ret)
3477 goto error;
3478
3479 return 0;
3480 error:
3481 destroy_workqueue(cm.wq);
3482 return ret;
3483 }
3484
3485 static void __exit ib_cm_cleanup(void)
3486 {
3487 struct cm_timewait_info *timewait_info, *tmp;
3488
3489 spin_lock_irq(&cm.lock);
3490 list_for_each_entry(timewait_info, &cm.timewait_list, list)
3491 cancel_delayed_work(&timewait_info->work.work);
3492 spin_unlock_irq(&cm.lock);
3493
3494 destroy_workqueue(cm.wq);
3495
3496 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
3497 list_del(&timewait_info->list);
3498 kfree(timewait_info);
3499 }
3500
3501 ib_unregister_client(&cm_client);
3502 idr_destroy(&cm.local_id_table);
3503 }
3504
3505 module_init(ib_cm_init);
3506 module_exit(ib_cm_cleanup);
3507
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