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[PATCH] swsusp: rework swsusp_suspend
[linux-2.6/libata-dev.git] / drivers / infiniband / core / cm.c
blob02110e00d145bdf09c6f706914ed24571ecb65ec
1 /*
2 * Copyright (c) 2004, 2005 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 2821 2005-07-08 17:07:28Z sean.hefty $
36 */
37 #include <linux/dma-mapping.h>
38 #include <linux/err.h>
39 #include <linux/idr.h>
40 #include <linux/interrupt.h>
41 #include <linux/pci.h>
42 #include <linux/rbtree.h>
43 #include <linux/spinlock.h>
44 #include <linux/workqueue.h>
45
46 #include <rdma/ib_cache.h>
47 #include <rdma/ib_cm.h>
48 #include "cm_msgs.h"
49
50 MODULE_AUTHOR("Sean Hefty");
51 MODULE_DESCRIPTION("InfiniBand CM");
52 MODULE_LICENSE("Dual BSD/GPL");
53
54 static void cm_add_one(struct ib_device *device);
55 static void cm_remove_one(struct ib_device *device);
56
57 static struct ib_client cm_client = {
58 .name = "cm",
59 .add = cm_add_one,
60 .remove = cm_remove_one
61 };
62
63 static struct ib_cm {
64 spinlock_t lock;
65 struct list_head device_list;
66 rwlock_t device_lock;
67 struct rb_root listen_service_table;
68 u64 listen_service_id;
69 /* struct rb_root peer_service_table; todo: fix peer to peer */
70 struct rb_root remote_qp_table;
71 struct rb_root remote_id_table;
72 struct rb_root remote_sidr_table;
73 struct idr local_id_table;
74 struct workqueue_struct *wq;
75 } cm;
76
77 struct cm_port {
78 struct cm_device *cm_dev;
79 struct ib_mad_agent *mad_agent;
80 u8 port_num;
81 };
82
83 struct cm_device {
84 struct list_head list;
85 struct ib_device *device;
86 __be64 ca_guid;
87 struct cm_port port[0];
88 };
89
90 struct cm_av {
91 struct cm_port *port;
92 union ib_gid dgid;
93 struct ib_ah_attr ah_attr;
94 u16 pkey_index;
95 u8 packet_life_time;
96 };
97
98 struct cm_work {
99 struct work_struct work;
100 struct list_head list;
101 struct cm_port *port;
102 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
103 __be32 local_id; /* Established / timewait */
104 __be32 remote_id;
105 struct ib_cm_event cm_event;
106 struct ib_sa_path_rec path[0];
107 };
108
109 struct cm_timewait_info {
110 struct cm_work work; /* Must be first. */
111 struct rb_node remote_qp_node;
112 struct rb_node remote_id_node;
113 __be64 remote_ca_guid;
114 __be32 remote_qpn;
115 u8 inserted_remote_qp;
116 u8 inserted_remote_id;
117 };
118
119 struct cm_id_private {
120 struct ib_cm_id id;
121
122 struct rb_node service_node;
123 struct rb_node sidr_id_node;
124 spinlock_t lock;
125 wait_queue_head_t wait;
126 atomic_t refcount;
127
128 struct ib_mad_send_buf *msg;
129 struct cm_timewait_info *timewait_info;
130 /* todo: use alternate port on send failure */
131 struct cm_av av;
132 struct cm_av alt_av;
133
134 void *private_data;
135 __be64 tid;
136 __be32 local_qpn;
137 __be32 remote_qpn;
138 enum ib_qp_type qp_type;
139 __be32 sq_psn;
140 __be32 rq_psn;
141 int timeout_ms;
142 enum ib_mtu path_mtu;
143 u8 private_data_len;
144 u8 max_cm_retries;
145 u8 peer_to_peer;
146 u8 responder_resources;
147 u8 initiator_depth;
148 u8 local_ack_timeout;
149 u8 retry_count;
150 u8 rnr_retry_count;
151 u8 service_timeout;
152
153 struct list_head work_list;
154 atomic_t work_count;
155 };
156
157 static void cm_work_handler(void *data);
158
159 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
160 {
161 if (atomic_dec_and_test(&cm_id_priv->refcount))
162 wake_up(&cm_id_priv->wait);
163 }
164
165 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
166 struct ib_mad_send_buf **msg)
167 {
168 struct ib_mad_agent *mad_agent;
169 struct ib_mad_send_buf *m;
170 struct ib_ah *ah;
171
172 mad_agent = cm_id_priv->av.port->mad_agent;
173 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
174 if (IS_ERR(ah))
175 return PTR_ERR(ah);
176
177 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
178 cm_id_priv->av.pkey_index,
179 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
180 GFP_ATOMIC);
181 if (IS_ERR(m)) {
182 ib_destroy_ah(ah);
183 return PTR_ERR(m);
184 }
185
186 /* Timeout set by caller if response is expected. */
187 m->ah = ah;
188 m->retries = cm_id_priv->max_cm_retries;
189
190 atomic_inc(&cm_id_priv->refcount);
191 m->context[0] = cm_id_priv;
192 *msg = m;
193 return 0;
194 }
195
196 static int cm_alloc_response_msg(struct cm_port *port,
197 struct ib_mad_recv_wc *mad_recv_wc,
198 struct ib_mad_send_buf **msg)
199 {
200 struct ib_mad_send_buf *m;
201 struct ib_ah *ah;
202
203 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
204 mad_recv_wc->recv_buf.grh, port->port_num);
205 if (IS_ERR(ah))
206 return PTR_ERR(ah);
207
208 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
209 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
210 GFP_ATOMIC);
211 if (IS_ERR(m)) {
212 ib_destroy_ah(ah);
213 return PTR_ERR(m);
214 }
215 m->ah = ah;
216 *msg = m;
217 return 0;
218 }
219
220 static void cm_free_msg(struct ib_mad_send_buf *msg)
221 {
222 ib_destroy_ah(msg->ah);
223 if (msg->context[0])
224 cm_deref_id(msg->context[0]);
225 ib_free_send_mad(msg);
226 }
227
228 static void * cm_copy_private_data(const void *private_data,
229 u8 private_data_len)
230 {
231 void *data;
232
233 if (!private_data || !private_data_len)
234 return NULL;
235
236 data = kmalloc(private_data_len, GFP_KERNEL);
237 if (!data)
238 return ERR_PTR(-ENOMEM);
239
240 memcpy(data, private_data, private_data_len);
241 return data;
242 }
243
244 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
245 void *private_data, u8 private_data_len)
246 {
247 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
248 kfree(cm_id_priv->private_data);
249
250 cm_id_priv->private_data = private_data;
251 cm_id_priv->private_data_len = private_data_len;
252 }
253
254 static void cm_set_ah_attr(struct ib_ah_attr *ah_attr, u8 port_num,
255 u16 dlid, u8 sl, u16 src_path_bits)
256 {
257 memset(ah_attr, 0, sizeof ah_attr);
258 ah_attr->dlid = dlid;
259 ah_attr->sl = sl;
260 ah_attr->src_path_bits = src_path_bits;
261 ah_attr->port_num = port_num;
262 }
263
264 static void cm_init_av_for_response(struct cm_port *port,
265 struct ib_wc *wc, struct cm_av *av)
266 {
267 av->port = port;
268 av->pkey_index = wc->pkey_index;
269 cm_set_ah_attr(&av->ah_attr, port->port_num, wc->slid,
270 wc->sl, wc->dlid_path_bits);
271 }
272
273 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
274 {
275 struct cm_device *cm_dev;
276 struct cm_port *port = NULL;
277 unsigned long flags;
278 int ret;
279 u8 p;
280
281 read_lock_irqsave(&cm.device_lock, flags);
282 list_for_each_entry(cm_dev, &cm.device_list, list) {
283 if (!ib_find_cached_gid(cm_dev->device, &path->sgid,
284 &p, NULL)) {
285 port = &cm_dev->port[p-1];
286 break;
287 }
288 }
289 read_unlock_irqrestore(&cm.device_lock, flags);
290
291 if (!port)
292 return -EINVAL;
293
294 ret = ib_find_cached_pkey(cm_dev->device, port->port_num,
295 be16_to_cpu(path->pkey), &av->pkey_index);
296 if (ret)
297 return ret;
298
299 av->port = port;
300 cm_set_ah_attr(&av->ah_attr, av->port->port_num,
301 be16_to_cpu(path->dlid), path->sl,
302 be16_to_cpu(path->slid) & 0x7F);
303 av->packet_life_time = path->packet_life_time;
304 return 0;
305 }
306
307 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
308 {
309 unsigned long flags;
310 int ret;
311
312 do {
313 spin_lock_irqsave(&cm.lock, flags);
314 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, 1,
315 (__force int *) &cm_id_priv->id.local_id);
316 spin_unlock_irqrestore(&cm.lock, flags);
317 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
318 return ret;
319 }
320
321 static void cm_free_id(__be32 local_id)
322 {
323 unsigned long flags;
324
325 spin_lock_irqsave(&cm.lock, flags);
326 idr_remove(&cm.local_id_table, (__force int) local_id);
327 spin_unlock_irqrestore(&cm.lock, flags);
328 }
329
330 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
331 {
332 struct cm_id_private *cm_id_priv;
333
334 cm_id_priv = idr_find(&cm.local_id_table, (__force int) local_id);
335 if (cm_id_priv) {
336 if (cm_id_priv->id.remote_id == remote_id)
337 atomic_inc(&cm_id_priv->refcount);
338 else
339 cm_id_priv = NULL;
340 }
341
342 return cm_id_priv;
343 }
344
345 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
346 {
347 struct cm_id_private *cm_id_priv;
348 unsigned long flags;
349
350 spin_lock_irqsave(&cm.lock, flags);
351 cm_id_priv = cm_get_id(local_id, remote_id);
352 spin_unlock_irqrestore(&cm.lock, flags);
353
354 return cm_id_priv;
355 }
356
357 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
358 {
359 struct rb_node **link = &cm.listen_service_table.rb_node;
360 struct rb_node *parent = NULL;
361 struct cm_id_private *cur_cm_id_priv;
362 __be64 service_id = cm_id_priv->id.service_id;
363 __be64 service_mask = cm_id_priv->id.service_mask;
364
365 while (*link) {
366 parent = *link;
367 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
368 service_node);
369 if ((cur_cm_id_priv->id.service_mask & service_id) ==
370 (service_mask & cur_cm_id_priv->id.service_id) &&
371 (cm_id_priv->id.device == cur_cm_id_priv->id.device))
372 return cur_cm_id_priv;
373
374 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
375 link = &(*link)->rb_left;
376 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
377 link = &(*link)->rb_right;
378 else if (service_id < cur_cm_id_priv->id.service_id)
379 link = &(*link)->rb_left;
380 else
381 link = &(*link)->rb_right;
382 }
383 rb_link_node(&cm_id_priv->service_node, parent, link);
384 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
385 return NULL;
386 }
387
388 static struct cm_id_private * cm_find_listen(struct ib_device *device,
389 __be64 service_id)
390 {
391 struct rb_node *node = cm.listen_service_table.rb_node;
392 struct cm_id_private *cm_id_priv;
393
394 while (node) {
395 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
396 if ((cm_id_priv->id.service_mask & service_id) ==
397 cm_id_priv->id.service_id &&
398 (cm_id_priv->id.device == device))
399 return cm_id_priv;
400
401 if (device < cm_id_priv->id.device)
402 node = node->rb_left;
403 else if (device > cm_id_priv->id.device)
404 node = node->rb_right;
405 else if (service_id < cm_id_priv->id.service_id)
406 node = node->rb_left;
407 else
408 node = node->rb_right;
409 }
410 return NULL;
411 }
412
413 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
414 *timewait_info)
415 {
416 struct rb_node **link = &cm.remote_id_table.rb_node;
417 struct rb_node *parent = NULL;
418 struct cm_timewait_info *cur_timewait_info;
419 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
420 __be32 remote_id = timewait_info->work.remote_id;
421
422 while (*link) {
423 parent = *link;
424 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
425 remote_id_node);
426 if (remote_id < cur_timewait_info->work.remote_id)
427 link = &(*link)->rb_left;
428 else if (remote_id > cur_timewait_info->work.remote_id)
429 link = &(*link)->rb_right;
430 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
431 link = &(*link)->rb_left;
432 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
433 link = &(*link)->rb_right;
434 else
435 return cur_timewait_info;
436 }
437 timewait_info->inserted_remote_id = 1;
438 rb_link_node(&timewait_info->remote_id_node, parent, link);
439 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
440 return NULL;
441 }
442
443 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
444 __be32 remote_id)
445 {
446 struct rb_node *node = cm.remote_id_table.rb_node;
447 struct cm_timewait_info *timewait_info;
448
449 while (node) {
450 timewait_info = rb_entry(node, struct cm_timewait_info,
451 remote_id_node);
452 if (remote_id < timewait_info->work.remote_id)
453 node = node->rb_left;
454 else if (remote_id > timewait_info->work.remote_id)
455 node = node->rb_right;
456 else if (remote_ca_guid < timewait_info->remote_ca_guid)
457 node = node->rb_left;
458 else if (remote_ca_guid > timewait_info->remote_ca_guid)
459 node = node->rb_right;
460 else
461 return timewait_info;
462 }
463 return NULL;
464 }
465
466 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
467 *timewait_info)
468 {
469 struct rb_node **link = &cm.remote_qp_table.rb_node;
470 struct rb_node *parent = NULL;
471 struct cm_timewait_info *cur_timewait_info;
472 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
473 __be32 remote_qpn = timewait_info->remote_qpn;
474
475 while (*link) {
476 parent = *link;
477 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
478 remote_qp_node);
479 if (remote_qpn < cur_timewait_info->remote_qpn)
480 link = &(*link)->rb_left;
481 else if (remote_qpn > cur_timewait_info->remote_qpn)
482 link = &(*link)->rb_right;
483 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
484 link = &(*link)->rb_left;
485 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
486 link = &(*link)->rb_right;
487 else
488 return cur_timewait_info;
489 }
490 timewait_info->inserted_remote_qp = 1;
491 rb_link_node(&timewait_info->remote_qp_node, parent, link);
492 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
493 return NULL;
494 }
495
496 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
497 *cm_id_priv)
498 {
499 struct rb_node **link = &cm.remote_sidr_table.rb_node;
500 struct rb_node *parent = NULL;
501 struct cm_id_private *cur_cm_id_priv;
502 union ib_gid *port_gid = &cm_id_priv->av.dgid;
503 __be32 remote_id = cm_id_priv->id.remote_id;
504
505 while (*link) {
506 parent = *link;
507 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
508 sidr_id_node);
509 if (remote_id < cur_cm_id_priv->id.remote_id)
510 link = &(*link)->rb_left;
511 else if (remote_id > cur_cm_id_priv->id.remote_id)
512 link = &(*link)->rb_right;
513 else {
514 int cmp;
515 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
516 sizeof *port_gid);
517 if (cmp < 0)
518 link = &(*link)->rb_left;
519 else if (cmp > 0)
520 link = &(*link)->rb_right;
521 else
522 return cur_cm_id_priv;
523 }
524 }
525 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
526 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
527 return NULL;
528 }
529
530 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
531 enum ib_cm_sidr_status status)
532 {
533 struct ib_cm_sidr_rep_param param;
534
535 memset(&param, 0, sizeof param);
536 param.status = status;
537 ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
538 }
539
540 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
541 ib_cm_handler cm_handler,
542 void *context)
543 {
544 struct cm_id_private *cm_id_priv;
545 int ret;
546
547 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
548 if (!cm_id_priv)
549 return ERR_PTR(-ENOMEM);
550
551 cm_id_priv->id.state = IB_CM_IDLE;
552 cm_id_priv->id.device = device;
553 cm_id_priv->id.cm_handler = cm_handler;
554 cm_id_priv->id.context = context;
555 cm_id_priv->id.remote_cm_qpn = 1;
556 ret = cm_alloc_id(cm_id_priv);
557 if (ret)
558 goto error;
559
560 spin_lock_init(&cm_id_priv->lock);
561 init_waitqueue_head(&cm_id_priv->wait);
562 INIT_LIST_HEAD(&cm_id_priv->work_list);
563 atomic_set(&cm_id_priv->work_count, -1);
564 atomic_set(&cm_id_priv->refcount, 1);
565 return &cm_id_priv->id;
566
567 error:
568 kfree(cm_id_priv);
569 return ERR_PTR(-ENOMEM);
570 }
571 EXPORT_SYMBOL(ib_create_cm_id);
572
573 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
574 {
575 struct cm_work *work;
576
577 if (list_empty(&cm_id_priv->work_list))
578 return NULL;
579
580 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
581 list_del(&work->list);
582 return work;
583 }
584
585 static void cm_free_work(struct cm_work *work)
586 {
587 if (work->mad_recv_wc)
588 ib_free_recv_mad(work->mad_recv_wc);
589 kfree(work);
590 }
591
592 static inline int cm_convert_to_ms(int iba_time)
593 {
594 /* approximate conversion to ms from 4.096us x 2^iba_time */
595 return 1 << max(iba_time - 8, 0);
596 }
597
598 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
599 {
600 unsigned long flags;
601
602 if (!timewait_info->inserted_remote_id &&
603 !timewait_info->inserted_remote_qp)
604 return;
605
606 spin_lock_irqsave(&cm.lock, flags);
607 if (timewait_info->inserted_remote_id) {
608 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
609 timewait_info->inserted_remote_id = 0;
610 }
611
612 if (timewait_info->inserted_remote_qp) {
613 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
614 timewait_info->inserted_remote_qp = 0;
615 }
616 spin_unlock_irqrestore(&cm.lock, flags);
617 }
618
619 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
620 {
621 struct cm_timewait_info *timewait_info;
622
623 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
624 if (!timewait_info)
625 return ERR_PTR(-ENOMEM);
626
627 timewait_info->work.local_id = local_id;
628 INIT_WORK(&timewait_info->work.work, cm_work_handler,
629 &timewait_info->work);
630 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
631 return timewait_info;
632 }
633
634 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
635 {
636 int wait_time;
637
638 /*
639 * The cm_id could be destroyed by the user before we exit timewait.
640 * To protect against this, we search for the cm_id after exiting
641 * timewait before notifying the user that we've exited timewait.
642 */
643 cm_id_priv->id.state = IB_CM_TIMEWAIT;
644 wait_time = cm_convert_to_ms(cm_id_priv->local_ack_timeout);
645 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
646 msecs_to_jiffies(wait_time));
647 cm_id_priv->timewait_info = NULL;
648 }
649
650 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
651 {
652 cm_id_priv->id.state = IB_CM_IDLE;
653 if (cm_id_priv->timewait_info) {
654 cm_cleanup_timewait(cm_id_priv->timewait_info);
655 kfree(cm_id_priv->timewait_info);
656 cm_id_priv->timewait_info = NULL;
657 }
658 }
659
660 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
661 {
662 struct cm_id_private *cm_id_priv;
663 struct cm_work *work;
664 unsigned long flags;
665
666 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
667 retest:
668 spin_lock_irqsave(&cm_id_priv->lock, flags);
669 switch (cm_id->state) {
670 case IB_CM_LISTEN:
671 cm_id->state = IB_CM_IDLE;
672 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
673 spin_lock_irqsave(&cm.lock, flags);
674 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
675 spin_unlock_irqrestore(&cm.lock, flags);
676 break;
677 case IB_CM_SIDR_REQ_SENT:
678 cm_id->state = IB_CM_IDLE;
679 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
680 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
681 break;
682 case IB_CM_SIDR_REQ_RCVD:
683 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
684 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
685 break;
686 case IB_CM_REQ_SENT:
687 case IB_CM_MRA_REQ_RCVD:
688 case IB_CM_REP_SENT:
689 case IB_CM_MRA_REP_RCVD:
690 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
691 /* Fall through */
692 case IB_CM_REQ_RCVD:
693 case IB_CM_MRA_REQ_SENT:
694 case IB_CM_REP_RCVD:
695 case IB_CM_MRA_REP_SENT:
696 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
697 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
698 &cm_id_priv->av.port->cm_dev->ca_guid,
699 sizeof cm_id_priv->av.port->cm_dev->ca_guid,
700 NULL, 0);
701 break;
702 case IB_CM_ESTABLISHED:
703 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
704 ib_send_cm_dreq(cm_id, NULL, 0);
705 goto retest;
706 case IB_CM_DREQ_SENT:
707 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
708 cm_enter_timewait(cm_id_priv);
709 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
710 break;
711 case IB_CM_DREQ_RCVD:
712 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
713 ib_send_cm_drep(cm_id, NULL, 0);
714 break;
715 default:
716 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
717 break;
718 }
719
720 cm_free_id(cm_id->local_id);
721 atomic_dec(&cm_id_priv->refcount);
722 wait_event(cm_id_priv->wait, !atomic_read(&cm_id_priv->refcount));
723 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
724 cm_free_work(work);
725 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
726 kfree(cm_id_priv->private_data);
727 kfree(cm_id_priv);
728 }
729 EXPORT_SYMBOL(ib_destroy_cm_id);
730
731 int ib_cm_listen(struct ib_cm_id *cm_id,
732 __be64 service_id,
733 __be64 service_mask)
734 {
735 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
736 unsigned long flags;
737 int ret = 0;
738
739 service_mask = service_mask ? service_mask :
740 __constant_cpu_to_be64(~0ULL);
741 service_id &= service_mask;
742 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
743 (service_id != IB_CM_ASSIGN_SERVICE_ID))
744 return -EINVAL;
745
746 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
747 BUG_ON(cm_id->state != IB_CM_IDLE);
748
749 cm_id->state = IB_CM_LISTEN;
750
751 spin_lock_irqsave(&cm.lock, flags);
752 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
753 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
754 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
755 } else {
756 cm_id->service_id = service_id;
757 cm_id->service_mask = service_mask;
758 }
759 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
760 spin_unlock_irqrestore(&cm.lock, flags);
761
762 if (cur_cm_id_priv) {
763 cm_id->state = IB_CM_IDLE;
764 ret = -EBUSY;
765 }
766 return ret;
767 }
768 EXPORT_SYMBOL(ib_cm_listen);
769
770 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
771 enum cm_msg_sequence msg_seq)
772 {
773 u64 hi_tid, low_tid;
774
775 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
776 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
777 (msg_seq << 30));
778 return cpu_to_be64(hi_tid | low_tid);
779 }
780
781 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
782 __be16 attr_id, __be64 tid)
783 {
784 hdr->base_version = IB_MGMT_BASE_VERSION;
785 hdr->mgmt_class = IB_MGMT_CLASS_CM;
786 hdr->class_version = IB_CM_CLASS_VERSION;
787 hdr->method = IB_MGMT_METHOD_SEND;
788 hdr->attr_id = attr_id;
789 hdr->tid = tid;
790 }
791
792 static void cm_format_req(struct cm_req_msg *req_msg,
793 struct cm_id_private *cm_id_priv,
794 struct ib_cm_req_param *param)
795 {
796 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
797 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
798
799 req_msg->local_comm_id = cm_id_priv->id.local_id;
800 req_msg->service_id = param->service_id;
801 req_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
802 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
803 cm_req_set_resp_res(req_msg, param->responder_resources);
804 cm_req_set_init_depth(req_msg, param->initiator_depth);
805 cm_req_set_remote_resp_timeout(req_msg,
806 param->remote_cm_response_timeout);
807 cm_req_set_qp_type(req_msg, param->qp_type);
808 cm_req_set_flow_ctrl(req_msg, param->flow_control);
809 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
810 cm_req_set_local_resp_timeout(req_msg,
811 param->local_cm_response_timeout);
812 cm_req_set_retry_count(req_msg, param->retry_count);
813 req_msg->pkey = param->primary_path->pkey;
814 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
815 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
816 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
817 cm_req_set_srq(req_msg, param->srq);
818
819 req_msg->primary_local_lid = param->primary_path->slid;
820 req_msg->primary_remote_lid = param->primary_path->dlid;
821 req_msg->primary_local_gid = param->primary_path->sgid;
822 req_msg->primary_remote_gid = param->primary_path->dgid;
823 cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label);
824 cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate);
825 req_msg->primary_traffic_class = param->primary_path->traffic_class;
826 req_msg->primary_hop_limit = param->primary_path->hop_limit;
827 cm_req_set_primary_sl(req_msg, param->primary_path->sl);
828 cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */
829 cm_req_set_primary_local_ack_timeout(req_msg,
830 min(31, param->primary_path->packet_life_time + 1));
831
832 if (param->alternate_path) {
833 req_msg->alt_local_lid = param->alternate_path->slid;
834 req_msg->alt_remote_lid = param->alternate_path->dlid;
835 req_msg->alt_local_gid = param->alternate_path->sgid;
836 req_msg->alt_remote_gid = param->alternate_path->dgid;
837 cm_req_set_alt_flow_label(req_msg,
838 param->alternate_path->flow_label);
839 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate);
840 req_msg->alt_traffic_class = param->alternate_path->traffic_class;
841 req_msg->alt_hop_limit = param->alternate_path->hop_limit;
842 cm_req_set_alt_sl(req_msg, param->alternate_path->sl);
843 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */
844 cm_req_set_alt_local_ack_timeout(req_msg,
845 min(31, param->alternate_path->packet_life_time + 1));
846 }
847
848 if (param->private_data && param->private_data_len)
849 memcpy(req_msg->private_data, param->private_data,
850 param->private_data_len);
851 }
852
853 static inline int cm_validate_req_param(struct ib_cm_req_param *param)
854 {
855 /* peer-to-peer not supported */
856 if (param->peer_to_peer)
857 return -EINVAL;
858
859 if (!param->primary_path)
860 return -EINVAL;
861
862 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
863 return -EINVAL;
864
865 if (param->private_data &&
866 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
867 return -EINVAL;
868
869 if (param->alternate_path &&
870 (param->alternate_path->pkey != param->primary_path->pkey ||
871 param->alternate_path->mtu != param->primary_path->mtu))
872 return -EINVAL;
873
874 return 0;
875 }
876
877 int ib_send_cm_req(struct ib_cm_id *cm_id,
878 struct ib_cm_req_param *param)
879 {
880 struct cm_id_private *cm_id_priv;
881 struct cm_req_msg *req_msg;
882 unsigned long flags;
883 int ret;
884
885 ret = cm_validate_req_param(param);
886 if (ret)
887 return ret;
888
889 /* Verify that we're not in timewait. */
890 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
891 spin_lock_irqsave(&cm_id_priv->lock, flags);
892 if (cm_id->state != IB_CM_IDLE) {
893 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
894 ret = -EINVAL;
895 goto out;
896 }
897 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
898
899 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
900 id.local_id);
901 if (IS_ERR(cm_id_priv->timewait_info))
902 goto out;
903
904 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
905 if (ret)
906 goto error1;
907 if (param->alternate_path) {
908 ret = cm_init_av_by_path(param->alternate_path,
909 &cm_id_priv->alt_av);
910 if (ret)
911 goto error1;
912 }
913 cm_id->service_id = param->service_id;
914 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
915 cm_id_priv->timeout_ms = cm_convert_to_ms(
916 param->primary_path->packet_life_time) * 2 +
917 cm_convert_to_ms(
918 param->remote_cm_response_timeout);
919 cm_id_priv->max_cm_retries = param->max_cm_retries;
920 cm_id_priv->initiator_depth = param->initiator_depth;
921 cm_id_priv->responder_resources = param->responder_resources;
922 cm_id_priv->retry_count = param->retry_count;
923 cm_id_priv->path_mtu = param->primary_path->mtu;
924 cm_id_priv->qp_type = param->qp_type;
925
926 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
927 if (ret)
928 goto error1;
929
930 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
931 cm_format_req(req_msg, cm_id_priv, param);
932 cm_id_priv->tid = req_msg->hdr.tid;
933 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
934 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
935
936 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
937 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
938 cm_id_priv->local_ack_timeout =
939 cm_req_get_primary_local_ack_timeout(req_msg);
940
941 spin_lock_irqsave(&cm_id_priv->lock, flags);
942 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
943 if (ret) {
944 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
945 goto error2;
946 }
947 BUG_ON(cm_id->state != IB_CM_IDLE);
948 cm_id->state = IB_CM_REQ_SENT;
949 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
950 return 0;
951
952 error2: cm_free_msg(cm_id_priv->msg);
953 error1: kfree(cm_id_priv->timewait_info);
954 out: return ret;
955 }
956 EXPORT_SYMBOL(ib_send_cm_req);
957
958 static int cm_issue_rej(struct cm_port *port,
959 struct ib_mad_recv_wc *mad_recv_wc,
960 enum ib_cm_rej_reason reason,
961 enum cm_msg_response msg_rejected,
962 void *ari, u8 ari_length)
963 {
964 struct ib_mad_send_buf *msg = NULL;
965 struct cm_rej_msg *rej_msg, *rcv_msg;
966 int ret;
967
968 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
969 if (ret)
970 return ret;
971
972 /* We just need common CM header information. Cast to any message. */
973 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
974 rej_msg = (struct cm_rej_msg *) msg->mad;
975
976 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
977 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
978 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
979 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
980 rej_msg->reason = cpu_to_be16(reason);
981
982 if (ari && ari_length) {
983 cm_rej_set_reject_info_len(rej_msg, ari_length);
984 memcpy(rej_msg->ari, ari, ari_length);
985 }
986
987 ret = ib_post_send_mad(msg, NULL);
988 if (ret)
989 cm_free_msg(msg);
990
991 return ret;
992 }
993
994 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
995 __be32 local_qpn, __be32 remote_qpn)
996 {
997 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
998 ((local_ca_guid == remote_ca_guid) &&
999 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1000 }
1001
1002 static inline void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1003 struct ib_sa_path_rec *primary_path,
1004 struct ib_sa_path_rec *alt_path)
1005 {
1006 memset(primary_path, 0, sizeof *primary_path);
1007 primary_path->dgid = req_msg->primary_local_gid;
1008 primary_path->sgid = req_msg->primary_remote_gid;
1009 primary_path->dlid = req_msg->primary_local_lid;
1010 primary_path->slid = req_msg->primary_remote_lid;
1011 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1012 primary_path->hop_limit = req_msg->primary_hop_limit;
1013 primary_path->traffic_class = req_msg->primary_traffic_class;
1014 primary_path->reversible = 1;
1015 primary_path->pkey = req_msg->pkey;
1016 primary_path->sl = cm_req_get_primary_sl(req_msg);
1017 primary_path->mtu_selector = IB_SA_EQ;
1018 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1019 primary_path->rate_selector = IB_SA_EQ;
1020 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1021 primary_path->packet_life_time_selector = IB_SA_EQ;
1022 primary_path->packet_life_time =
1023 cm_req_get_primary_local_ack_timeout(req_msg);
1024 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1025
1026 if (req_msg->alt_local_lid) {
1027 memset(alt_path, 0, sizeof *alt_path);
1028 alt_path->dgid = req_msg->alt_local_gid;
1029 alt_path->sgid = req_msg->alt_remote_gid;
1030 alt_path->dlid = req_msg->alt_local_lid;
1031 alt_path->slid = req_msg->alt_remote_lid;
1032 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1033 alt_path->hop_limit = req_msg->alt_hop_limit;
1034 alt_path->traffic_class = req_msg->alt_traffic_class;
1035 alt_path->reversible = 1;
1036 alt_path->pkey = req_msg->pkey;
1037 alt_path->sl = cm_req_get_alt_sl(req_msg);
1038 alt_path->mtu_selector = IB_SA_EQ;
1039 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1040 alt_path->rate_selector = IB_SA_EQ;
1041 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1042 alt_path->packet_life_time_selector = IB_SA_EQ;
1043 alt_path->packet_life_time =
1044 cm_req_get_alt_local_ack_timeout(req_msg);
1045 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1046 }
1047 }
1048
1049 static void cm_format_req_event(struct cm_work *work,
1050 struct cm_id_private *cm_id_priv,
1051 struct ib_cm_id *listen_id)
1052 {
1053 struct cm_req_msg *req_msg;
1054 struct ib_cm_req_event_param *param;
1055
1056 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1057 param = &work->cm_event.param.req_rcvd;
1058 param->listen_id = listen_id;
1059 param->port = cm_id_priv->av.port->port_num;
1060 param->primary_path = &work->path[0];
1061 if (req_msg->alt_local_lid)
1062 param->alternate_path = &work->path[1];
1063 else
1064 param->alternate_path = NULL;
1065 param->remote_ca_guid = req_msg->local_ca_guid;
1066 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1067 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1068 param->qp_type = cm_req_get_qp_type(req_msg);
1069 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1070 param->responder_resources = cm_req_get_init_depth(req_msg);
1071 param->initiator_depth = cm_req_get_resp_res(req_msg);
1072 param->local_cm_response_timeout =
1073 cm_req_get_remote_resp_timeout(req_msg);
1074 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1075 param->remote_cm_response_timeout =
1076 cm_req_get_local_resp_timeout(req_msg);
1077 param->retry_count = cm_req_get_retry_count(req_msg);
1078 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1079 param->srq = cm_req_get_srq(req_msg);
1080 work->cm_event.private_data = &req_msg->private_data;
1081 }
1082
1083 static void cm_process_work(struct cm_id_private *cm_id_priv,
1084 struct cm_work *work)
1085 {
1086 unsigned long flags;
1087 int ret;
1088
1089 /* We will typically only have the current event to report. */
1090 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1091 cm_free_work(work);
1092
1093 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1094 spin_lock_irqsave(&cm_id_priv->lock, flags);
1095 work = cm_dequeue_work(cm_id_priv);
1096 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1097 BUG_ON(!work);
1098 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1099 &work->cm_event);
1100 cm_free_work(work);
1101 }
1102 cm_deref_id(cm_id_priv);
1103 if (ret)
1104 ib_destroy_cm_id(&cm_id_priv->id);
1105 }
1106
1107 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1108 struct cm_id_private *cm_id_priv,
1109 enum cm_msg_response msg_mraed, u8 service_timeout,
1110 const void *private_data, u8 private_data_len)
1111 {
1112 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1113 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1114 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1115 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1116 cm_mra_set_service_timeout(mra_msg, service_timeout);
1117
1118 if (private_data && private_data_len)
1119 memcpy(mra_msg->private_data, private_data, private_data_len);
1120 }
1121
1122 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1123 struct cm_id_private *cm_id_priv,
1124 enum ib_cm_rej_reason reason,
1125 void *ari,
1126 u8 ari_length,
1127 const void *private_data,
1128 u8 private_data_len)
1129 {
1130 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1131 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1132
1133 switch(cm_id_priv->id.state) {
1134 case IB_CM_REQ_RCVD:
1135 rej_msg->local_comm_id = 0;
1136 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1137 break;
1138 case IB_CM_MRA_REQ_SENT:
1139 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1140 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1141 break;
1142 case IB_CM_REP_RCVD:
1143 case IB_CM_MRA_REP_SENT:
1144 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1145 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1146 break;
1147 default:
1148 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1149 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1150 break;
1151 }
1152
1153 rej_msg->reason = cpu_to_be16(reason);
1154 if (ari && ari_length) {
1155 cm_rej_set_reject_info_len(rej_msg, ari_length);
1156 memcpy(rej_msg->ari, ari, ari_length);
1157 }
1158
1159 if (private_data && private_data_len)
1160 memcpy(rej_msg->private_data, private_data, private_data_len);
1161 }
1162
1163 static void cm_dup_req_handler(struct cm_work *work,
1164 struct cm_id_private *cm_id_priv)
1165 {
1166 struct ib_mad_send_buf *msg = NULL;
1167 unsigned long flags;
1168 int ret;
1169
1170 /* Quick state check to discard duplicate REQs. */
1171 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1172 return;
1173
1174 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1175 if (ret)
1176 return;
1177
1178 spin_lock_irqsave(&cm_id_priv->lock, flags);
1179 switch (cm_id_priv->id.state) {
1180 case IB_CM_MRA_REQ_SENT:
1181 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1182 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1183 cm_id_priv->private_data,
1184 cm_id_priv->private_data_len);
1185 break;
1186 case IB_CM_TIMEWAIT:
1187 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1188 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1189 break;
1190 default:
1191 goto unlock;
1192 }
1193 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1194
1195 ret = ib_post_send_mad(msg, NULL);
1196 if (ret)
1197 goto free;
1198 return;
1199
1200 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1201 free: cm_free_msg(msg);
1202 }
1203
1204 static struct cm_id_private * cm_match_req(struct cm_work *work,
1205 struct cm_id_private *cm_id_priv)
1206 {
1207 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1208 struct cm_timewait_info *timewait_info;
1209 struct cm_req_msg *req_msg;
1210 unsigned long flags;
1211
1212 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1213
1214 /* Check for duplicate REQ and stale connections. */
1215 spin_lock_irqsave(&cm.lock, flags);
1216 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1217 if (!timewait_info)
1218 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1219
1220 if (timewait_info) {
1221 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1222 timewait_info->work.remote_id);
1223 spin_unlock_irqrestore(&cm.lock, flags);
1224 if (cur_cm_id_priv) {
1225 cm_dup_req_handler(work, cur_cm_id_priv);
1226 cm_deref_id(cur_cm_id_priv);
1227 } else
1228 cm_issue_rej(work->port, work->mad_recv_wc,
1229 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1230 NULL, 0);
1231 goto error;
1232 }
1233
1234 /* Find matching listen request. */
1235 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1236 req_msg->service_id);
1237 if (!listen_cm_id_priv) {
1238 spin_unlock_irqrestore(&cm.lock, flags);
1239 cm_issue_rej(work->port, work->mad_recv_wc,
1240 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1241 NULL, 0);
1242 goto error;
1243 }
1244 atomic_inc(&listen_cm_id_priv->refcount);
1245 atomic_inc(&cm_id_priv->refcount);
1246 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1247 atomic_inc(&cm_id_priv->work_count);
1248 spin_unlock_irqrestore(&cm.lock, flags);
1249 return listen_cm_id_priv;
1250
1251 error: cm_cleanup_timewait(cm_id_priv->timewait_info);
1252 return NULL;
1253 }
1254
1255 static int cm_req_handler(struct cm_work *work)
1256 {
1257 struct ib_cm_id *cm_id;
1258 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1259 struct cm_req_msg *req_msg;
1260 int ret;
1261
1262 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1263
1264 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
1265 if (IS_ERR(cm_id))
1266 return PTR_ERR(cm_id);
1267
1268 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1269 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1270 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1271 &cm_id_priv->av);
1272 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1273 id.local_id);
1274 if (IS_ERR(cm_id_priv->timewait_info)) {
1275 ret = PTR_ERR(cm_id_priv->timewait_info);
1276 goto error1;
1277 }
1278 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1279 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1280 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1281
1282 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1283 if (!listen_cm_id_priv) {
1284 ret = -EINVAL;
1285 goto error2;
1286 }
1287
1288 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1289 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1290 cm_id_priv->id.service_id = req_msg->service_id;
1291 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
1292
1293 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1294 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1295 if (ret)
1296 goto error3;
1297 if (req_msg->alt_local_lid) {
1298 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1299 if (ret)
1300 goto error3;
1301 }
1302 cm_id_priv->tid = req_msg->hdr.tid;
1303 cm_id_priv->timeout_ms = cm_convert_to_ms(
1304 cm_req_get_local_resp_timeout(req_msg));
1305 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1306 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1307 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1308 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1309 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1310 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1311 cm_id_priv->local_ack_timeout =
1312 cm_req_get_primary_local_ack_timeout(req_msg);
1313 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1314 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1315 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1316
1317 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1318 cm_process_work(cm_id_priv, work);
1319 cm_deref_id(listen_cm_id_priv);
1320 return 0;
1321
1322 error3: atomic_dec(&cm_id_priv->refcount);
1323 cm_deref_id(listen_cm_id_priv);
1324 cm_cleanup_timewait(cm_id_priv->timewait_info);
1325 error2: kfree(cm_id_priv->timewait_info);
1326 cm_id_priv->timewait_info = NULL;
1327 error1: ib_destroy_cm_id(&cm_id_priv->id);
1328 return ret;
1329 }
1330
1331 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1332 struct cm_id_private *cm_id_priv,
1333 struct ib_cm_rep_param *param)
1334 {
1335 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1336 rep_msg->local_comm_id = cm_id_priv->id.local_id;
1337 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1338 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1339 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1340 rep_msg->resp_resources = param->responder_resources;
1341 rep_msg->initiator_depth = param->initiator_depth;
1342 cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay);
1343 cm_rep_set_failover(rep_msg, param->failover_accepted);
1344 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1345 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1346 cm_rep_set_srq(rep_msg, param->srq);
1347 rep_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
1348
1349 if (param->private_data && param->private_data_len)
1350 memcpy(rep_msg->private_data, param->private_data,
1351 param->private_data_len);
1352 }
1353
1354 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1355 struct ib_cm_rep_param *param)
1356 {
1357 struct cm_id_private *cm_id_priv;
1358 struct ib_mad_send_buf *msg;
1359 struct cm_rep_msg *rep_msg;
1360 unsigned long flags;
1361 int ret;
1362
1363 if (param->private_data &&
1364 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1365 return -EINVAL;
1366
1367 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1368 spin_lock_irqsave(&cm_id_priv->lock, flags);
1369 if (cm_id->state != IB_CM_REQ_RCVD &&
1370 cm_id->state != IB_CM_MRA_REQ_SENT) {
1371 ret = -EINVAL;
1372 goto out;
1373 }
1374
1375 ret = cm_alloc_msg(cm_id_priv, &msg);
1376 if (ret)
1377 goto out;
1378
1379 rep_msg = (struct cm_rep_msg *) msg->mad;
1380 cm_format_rep(rep_msg, cm_id_priv, param);
1381 msg->timeout_ms = cm_id_priv->timeout_ms;
1382 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1383
1384 ret = ib_post_send_mad(msg, NULL);
1385 if (ret) {
1386 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1387 cm_free_msg(msg);
1388 return ret;
1389 }
1390
1391 cm_id->state = IB_CM_REP_SENT;
1392 cm_id_priv->msg = msg;
1393 cm_id_priv->initiator_depth = param->initiator_depth;
1394 cm_id_priv->responder_resources = param->responder_resources;
1395 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1396 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1397
1398 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1399 return ret;
1400 }
1401 EXPORT_SYMBOL(ib_send_cm_rep);
1402
1403 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1404 struct cm_id_private *cm_id_priv,
1405 const void *private_data,
1406 u8 private_data_len)
1407 {
1408 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1409 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1410 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1411
1412 if (private_data && private_data_len)
1413 memcpy(rtu_msg->private_data, private_data, private_data_len);
1414 }
1415
1416 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1417 const void *private_data,
1418 u8 private_data_len)
1419 {
1420 struct cm_id_private *cm_id_priv;
1421 struct ib_mad_send_buf *msg;
1422 unsigned long flags;
1423 void *data;
1424 int ret;
1425
1426 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1427 return -EINVAL;
1428
1429 data = cm_copy_private_data(private_data, private_data_len);
1430 if (IS_ERR(data))
1431 return PTR_ERR(data);
1432
1433 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1434 spin_lock_irqsave(&cm_id_priv->lock, flags);
1435 if (cm_id->state != IB_CM_REP_RCVD &&
1436 cm_id->state != IB_CM_MRA_REP_SENT) {
1437 ret = -EINVAL;
1438 goto error;
1439 }
1440
1441 ret = cm_alloc_msg(cm_id_priv, &msg);
1442 if (ret)
1443 goto error;
1444
1445 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1446 private_data, private_data_len);
1447
1448 ret = ib_post_send_mad(msg, NULL);
1449 if (ret) {
1450 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1451 cm_free_msg(msg);
1452 kfree(data);
1453 return ret;
1454 }
1455
1456 cm_id->state = IB_CM_ESTABLISHED;
1457 cm_set_private_data(cm_id_priv, data, private_data_len);
1458 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1459 return 0;
1460
1461 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1462 kfree(data);
1463 return ret;
1464 }
1465 EXPORT_SYMBOL(ib_send_cm_rtu);
1466
1467 static void cm_format_rep_event(struct cm_work *work)
1468 {
1469 struct cm_rep_msg *rep_msg;
1470 struct ib_cm_rep_event_param *param;
1471
1472 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1473 param = &work->cm_event.param.rep_rcvd;
1474 param->remote_ca_guid = rep_msg->local_ca_guid;
1475 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1476 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1477 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1478 param->responder_resources = rep_msg->initiator_depth;
1479 param->initiator_depth = rep_msg->resp_resources;
1480 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1481 param->failover_accepted = cm_rep_get_failover(rep_msg);
1482 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1483 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1484 param->srq = cm_rep_get_srq(rep_msg);
1485 work->cm_event.private_data = &rep_msg->private_data;
1486 }
1487
1488 static void cm_dup_rep_handler(struct cm_work *work)
1489 {
1490 struct cm_id_private *cm_id_priv;
1491 struct cm_rep_msg *rep_msg;
1492 struct ib_mad_send_buf *msg = NULL;
1493 unsigned long flags;
1494 int ret;
1495
1496 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1497 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1498 rep_msg->local_comm_id);
1499 if (!cm_id_priv)
1500 return;
1501
1502 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1503 if (ret)
1504 goto deref;
1505
1506 spin_lock_irqsave(&cm_id_priv->lock, flags);
1507 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1508 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1509 cm_id_priv->private_data,
1510 cm_id_priv->private_data_len);
1511 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1512 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1513 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1514 cm_id_priv->private_data,
1515 cm_id_priv->private_data_len);
1516 else
1517 goto unlock;
1518 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1519
1520 ret = ib_post_send_mad(msg, NULL);
1521 if (ret)
1522 goto free;
1523 goto deref;
1524
1525 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1526 free: cm_free_msg(msg);
1527 deref: cm_deref_id(cm_id_priv);
1528 }
1529
1530 static int cm_rep_handler(struct cm_work *work)
1531 {
1532 struct cm_id_private *cm_id_priv;
1533 struct cm_rep_msg *rep_msg;
1534 unsigned long flags;
1535 int ret;
1536
1537 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1538 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1539 if (!cm_id_priv) {
1540 cm_dup_rep_handler(work);
1541 return -EINVAL;
1542 }
1543
1544 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1545 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1546 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1547
1548 spin_lock_irqsave(&cm.lock, flags);
1549 /* Check for duplicate REP. */
1550 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1551 spin_unlock_irqrestore(&cm.lock, flags);
1552 ret = -EINVAL;
1553 goto error;
1554 }
1555 /* Check for a stale connection. */
1556 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1557 spin_unlock_irqrestore(&cm.lock, flags);
1558 cm_issue_rej(work->port, work->mad_recv_wc,
1559 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1560 NULL, 0);
1561 ret = -EINVAL;
1562 goto error;
1563 }
1564 spin_unlock_irqrestore(&cm.lock, flags);
1565
1566 cm_format_rep_event(work);
1567
1568 spin_lock_irqsave(&cm_id_priv->lock, flags);
1569 switch (cm_id_priv->id.state) {
1570 case IB_CM_REQ_SENT:
1571 case IB_CM_MRA_REQ_RCVD:
1572 break;
1573 default:
1574 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1575 ret = -EINVAL;
1576 goto error;
1577 }
1578 cm_id_priv->id.state = IB_CM_REP_RCVD;
1579 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1580 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1581 cm_id_priv->initiator_depth = rep_msg->resp_resources;
1582 cm_id_priv->responder_resources = rep_msg->initiator_depth;
1583 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1584 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1585
1586 /* todo: handle peer_to_peer */
1587
1588 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1589 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1590 if (!ret)
1591 list_add_tail(&work->list, &cm_id_priv->work_list);
1592 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1593
1594 if (ret)
1595 cm_process_work(cm_id_priv, work);
1596 else
1597 cm_deref_id(cm_id_priv);
1598 return 0;
1599
1600 error: cm_cleanup_timewait(cm_id_priv->timewait_info);
1601 cm_deref_id(cm_id_priv);
1602 return ret;
1603 }
1604
1605 static int cm_establish_handler(struct cm_work *work)
1606 {
1607 struct cm_id_private *cm_id_priv;
1608 unsigned long flags;
1609 int ret;
1610
1611 /* See comment in ib_cm_establish about lookup. */
1612 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1613 if (!cm_id_priv)
1614 return -EINVAL;
1615
1616 spin_lock_irqsave(&cm_id_priv->lock, flags);
1617 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1618 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1619 goto out;
1620 }
1621
1622 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1623 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1624 if (!ret)
1625 list_add_tail(&work->list, &cm_id_priv->work_list);
1626 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1627
1628 if (ret)
1629 cm_process_work(cm_id_priv, work);
1630 else
1631 cm_deref_id(cm_id_priv);
1632 return 0;
1633 out:
1634 cm_deref_id(cm_id_priv);
1635 return -EINVAL;
1636 }
1637
1638 static int cm_rtu_handler(struct cm_work *work)
1639 {
1640 struct cm_id_private *cm_id_priv;
1641 struct cm_rtu_msg *rtu_msg;
1642 unsigned long flags;
1643 int ret;
1644
1645 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1646 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1647 rtu_msg->local_comm_id);
1648 if (!cm_id_priv)
1649 return -EINVAL;
1650
1651 work->cm_event.private_data = &rtu_msg->private_data;
1652
1653 spin_lock_irqsave(&cm_id_priv->lock, flags);
1654 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1655 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1656 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1657 goto out;
1658 }
1659 cm_id_priv->id.state = IB_CM_ESTABLISHED;
1660
1661 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1662 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1663 if (!ret)
1664 list_add_tail(&work->list, &cm_id_priv->work_list);
1665 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1666
1667 if (ret)
1668 cm_process_work(cm_id_priv, work);
1669 else
1670 cm_deref_id(cm_id_priv);
1671 return 0;
1672 out:
1673 cm_deref_id(cm_id_priv);
1674 return -EINVAL;
1675 }
1676
1677 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1678 struct cm_id_private *cm_id_priv,
1679 const void *private_data,
1680 u8 private_data_len)
1681 {
1682 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1683 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1684 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1685 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1686 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1687
1688 if (private_data && private_data_len)
1689 memcpy(dreq_msg->private_data, private_data, private_data_len);
1690 }
1691
1692 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1693 const void *private_data,
1694 u8 private_data_len)
1695 {
1696 struct cm_id_private *cm_id_priv;
1697 struct ib_mad_send_buf *msg;
1698 unsigned long flags;
1699 int ret;
1700
1701 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1702 return -EINVAL;
1703
1704 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1705 spin_lock_irqsave(&cm_id_priv->lock, flags);
1706 if (cm_id->state != IB_CM_ESTABLISHED) {
1707 ret = -EINVAL;
1708 goto out;
1709 }
1710
1711 ret = cm_alloc_msg(cm_id_priv, &msg);
1712 if (ret) {
1713 cm_enter_timewait(cm_id_priv);
1714 goto out;
1715 }
1716
1717 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1718 private_data, private_data_len);
1719 msg->timeout_ms = cm_id_priv->timeout_ms;
1720 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
1721
1722 ret = ib_post_send_mad(msg, NULL);
1723 if (ret) {
1724 cm_enter_timewait(cm_id_priv);
1725 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1726 cm_free_msg(msg);
1727 return ret;
1728 }
1729
1730 cm_id->state = IB_CM_DREQ_SENT;
1731 cm_id_priv->msg = msg;
1732 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1733 return ret;
1734 }
1735 EXPORT_SYMBOL(ib_send_cm_dreq);
1736
1737 static void cm_format_drep(struct cm_drep_msg *drep_msg,
1738 struct cm_id_private *cm_id_priv,
1739 const void *private_data,
1740 u8 private_data_len)
1741 {
1742 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
1743 drep_msg->local_comm_id = cm_id_priv->id.local_id;
1744 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1745
1746 if (private_data && private_data_len)
1747 memcpy(drep_msg->private_data, private_data, private_data_len);
1748 }
1749
1750 int ib_send_cm_drep(struct ib_cm_id *cm_id,
1751 const void *private_data,
1752 u8 private_data_len)
1753 {
1754 struct cm_id_private *cm_id_priv;
1755 struct ib_mad_send_buf *msg;
1756 unsigned long flags;
1757 void *data;
1758 int ret;
1759
1760 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
1761 return -EINVAL;
1762
1763 data = cm_copy_private_data(private_data, private_data_len);
1764 if (IS_ERR(data))
1765 return PTR_ERR(data);
1766
1767 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1768 spin_lock_irqsave(&cm_id_priv->lock, flags);
1769 if (cm_id->state != IB_CM_DREQ_RCVD) {
1770 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1771 kfree(data);
1772 return -EINVAL;
1773 }
1774
1775 cm_set_private_data(cm_id_priv, data, private_data_len);
1776 cm_enter_timewait(cm_id_priv);
1777
1778 ret = cm_alloc_msg(cm_id_priv, &msg);
1779 if (ret)
1780 goto out;
1781
1782 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1783 private_data, private_data_len);
1784
1785 ret = ib_post_send_mad(msg, NULL);
1786 if (ret) {
1787 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1788 cm_free_msg(msg);
1789 return ret;
1790 }
1791
1792 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1793 return ret;
1794 }
1795 EXPORT_SYMBOL(ib_send_cm_drep);
1796
1797 static int cm_dreq_handler(struct cm_work *work)
1798 {
1799 struct cm_id_private *cm_id_priv;
1800 struct cm_dreq_msg *dreq_msg;
1801 struct ib_mad_send_buf *msg = NULL;
1802 unsigned long flags;
1803 int ret;
1804
1805 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
1806 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
1807 dreq_msg->local_comm_id);
1808 if (!cm_id_priv)
1809 return -EINVAL;
1810
1811 work->cm_event.private_data = &dreq_msg->private_data;
1812
1813 spin_lock_irqsave(&cm_id_priv->lock, flags);
1814 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
1815 goto unlock;
1816
1817 switch (cm_id_priv->id.state) {
1818 case IB_CM_REP_SENT:
1819 case IB_CM_DREQ_SENT:
1820 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1821 break;
1822 case IB_CM_ESTABLISHED:
1823 case IB_CM_MRA_REP_RCVD:
1824 break;
1825 case IB_CM_TIMEWAIT:
1826 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
1827 goto unlock;
1828
1829 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1830 cm_id_priv->private_data,
1831 cm_id_priv->private_data_len);
1832 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1833
1834 if (ib_post_send_mad(msg, NULL))
1835 cm_free_msg(msg);
1836 goto deref;
1837 default:
1838 goto unlock;
1839 }
1840 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
1841 cm_id_priv->tid = dreq_msg->hdr.tid;
1842 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1843 if (!ret)
1844 list_add_tail(&work->list, &cm_id_priv->work_list);
1845 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1846
1847 if (ret)
1848 cm_process_work(cm_id_priv, work);
1849 else
1850 cm_deref_id(cm_id_priv);
1851 return 0;
1852
1853 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1854 deref: cm_deref_id(cm_id_priv);
1855 return -EINVAL;
1856 }
1857
1858 static int cm_drep_handler(struct cm_work *work)
1859 {
1860 struct cm_id_private *cm_id_priv;
1861 struct cm_drep_msg *drep_msg;
1862 unsigned long flags;
1863 int ret;
1864
1865 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
1866 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
1867 drep_msg->local_comm_id);
1868 if (!cm_id_priv)
1869 return -EINVAL;
1870
1871 work->cm_event.private_data = &drep_msg->private_data;
1872
1873 spin_lock_irqsave(&cm_id_priv->lock, flags);
1874 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
1875 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
1876 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1877 goto out;
1878 }
1879 cm_enter_timewait(cm_id_priv);
1880
1881 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1882 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1883 if (!ret)
1884 list_add_tail(&work->list, &cm_id_priv->work_list);
1885 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1886
1887 if (ret)
1888 cm_process_work(cm_id_priv, work);
1889 else
1890 cm_deref_id(cm_id_priv);
1891 return 0;
1892 out:
1893 cm_deref_id(cm_id_priv);
1894 return -EINVAL;
1895 }
1896
1897 int ib_send_cm_rej(struct ib_cm_id *cm_id,
1898 enum ib_cm_rej_reason reason,
1899 void *ari,
1900 u8 ari_length,
1901 const void *private_data,
1902 u8 private_data_len)
1903 {
1904 struct cm_id_private *cm_id_priv;
1905 struct ib_mad_send_buf *msg;
1906 unsigned long flags;
1907 int ret;
1908
1909 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
1910 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
1911 return -EINVAL;
1912
1913 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1914
1915 spin_lock_irqsave(&cm_id_priv->lock, flags);
1916 switch (cm_id->state) {
1917 case IB_CM_REQ_SENT:
1918 case IB_CM_MRA_REQ_RCVD:
1919 case IB_CM_REQ_RCVD:
1920 case IB_CM_MRA_REQ_SENT:
1921 case IB_CM_REP_RCVD:
1922 case IB_CM_MRA_REP_SENT:
1923 ret = cm_alloc_msg(cm_id_priv, &msg);
1924 if (!ret)
1925 cm_format_rej((struct cm_rej_msg *) msg->mad,
1926 cm_id_priv, reason, ari, ari_length,
1927 private_data, private_data_len);
1928
1929 cm_reset_to_idle(cm_id_priv);
1930 break;
1931 case IB_CM_REP_SENT:
1932 case IB_CM_MRA_REP_RCVD:
1933 ret = cm_alloc_msg(cm_id_priv, &msg);
1934 if (!ret)
1935 cm_format_rej((struct cm_rej_msg *) msg->mad,
1936 cm_id_priv, reason, ari, ari_length,
1937 private_data, private_data_len);
1938
1939 cm_enter_timewait(cm_id_priv);
1940 break;
1941 default:
1942 ret = -EINVAL;
1943 goto out;
1944 }
1945
1946 if (ret)
1947 goto out;
1948
1949 ret = ib_post_send_mad(msg, NULL);
1950 if (ret)
1951 cm_free_msg(msg);
1952
1953 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1954 return ret;
1955 }
1956 EXPORT_SYMBOL(ib_send_cm_rej);
1957
1958 static void cm_format_rej_event(struct cm_work *work)
1959 {
1960 struct cm_rej_msg *rej_msg;
1961 struct ib_cm_rej_event_param *param;
1962
1963 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
1964 param = &work->cm_event.param.rej_rcvd;
1965 param->ari = rej_msg->ari;
1966 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
1967 param->reason = __be16_to_cpu(rej_msg->reason);
1968 work->cm_event.private_data = &rej_msg->private_data;
1969 }
1970
1971 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
1972 {
1973 struct cm_timewait_info *timewait_info;
1974 struct cm_id_private *cm_id_priv;
1975 unsigned long flags;
1976 __be32 remote_id;
1977
1978 remote_id = rej_msg->local_comm_id;
1979
1980 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
1981 spin_lock_irqsave(&cm.lock, flags);
1982 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
1983 remote_id);
1984 if (!timewait_info) {
1985 spin_unlock_irqrestore(&cm.lock, flags);
1986 return NULL;
1987 }
1988 cm_id_priv = idr_find(&cm.local_id_table,
1989 (__force int) timewait_info->work.local_id);
1990 if (cm_id_priv) {
1991 if (cm_id_priv->id.remote_id == remote_id)
1992 atomic_inc(&cm_id_priv->refcount);
1993 else
1994 cm_id_priv = NULL;
1995 }
1996 spin_unlock_irqrestore(&cm.lock, flags);
1997 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
1998 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
1999 else
2000 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2001
2002 return cm_id_priv;
2003 }
2004
2005 static int cm_rej_handler(struct cm_work *work)
2006 {
2007 struct cm_id_private *cm_id_priv;
2008 struct cm_rej_msg *rej_msg;
2009 unsigned long flags;
2010 int ret;
2011
2012 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2013 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2014 if (!cm_id_priv)
2015 return -EINVAL;
2016
2017 cm_format_rej_event(work);
2018
2019 spin_lock_irqsave(&cm_id_priv->lock, flags);
2020 switch (cm_id_priv->id.state) {
2021 case IB_CM_REQ_SENT:
2022 case IB_CM_MRA_REQ_RCVD:
2023 case IB_CM_REP_SENT:
2024 case IB_CM_MRA_REP_RCVD:
2025 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2026 /* fall through */
2027 case IB_CM_REQ_RCVD:
2028 case IB_CM_MRA_REQ_SENT:
2029 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2030 cm_enter_timewait(cm_id_priv);
2031 else
2032 cm_reset_to_idle(cm_id_priv);
2033 break;
2034 case IB_CM_DREQ_SENT:
2035 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2036 /* fall through */
2037 case IB_CM_REP_RCVD:
2038 case IB_CM_MRA_REP_SENT:
2039 case IB_CM_ESTABLISHED:
2040 cm_enter_timewait(cm_id_priv);
2041 break;
2042 default:
2043 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2044 ret = -EINVAL;
2045 goto out;
2046 }
2047
2048 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2049 if (!ret)
2050 list_add_tail(&work->list, &cm_id_priv->work_list);
2051 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2052
2053 if (ret)
2054 cm_process_work(cm_id_priv, work);
2055 else
2056 cm_deref_id(cm_id_priv);
2057 return 0;
2058 out:
2059 cm_deref_id(cm_id_priv);
2060 return -EINVAL;
2061 }
2062
2063 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2064 u8 service_timeout,
2065 const void *private_data,
2066 u8 private_data_len)
2067 {
2068 struct cm_id_private *cm_id_priv;
2069 struct ib_mad_send_buf *msg;
2070 void *data;
2071 unsigned long flags;
2072 int ret;
2073
2074 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2075 return -EINVAL;
2076
2077 data = cm_copy_private_data(private_data, private_data_len);
2078 if (IS_ERR(data))
2079 return PTR_ERR(data);
2080
2081 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2082
2083 spin_lock_irqsave(&cm_id_priv->lock, flags);
2084 switch(cm_id_priv->id.state) {
2085 case IB_CM_REQ_RCVD:
2086 ret = cm_alloc_msg(cm_id_priv, &msg);
2087 if (ret)
2088 goto error1;
2089
2090 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2091 CM_MSG_RESPONSE_REQ, service_timeout,
2092 private_data, private_data_len);
2093 ret = ib_post_send_mad(msg, NULL);
2094 if (ret)
2095 goto error2;
2096 cm_id->state = IB_CM_MRA_REQ_SENT;
2097 break;
2098 case IB_CM_REP_RCVD:
2099 ret = cm_alloc_msg(cm_id_priv, &msg);
2100 if (ret)
2101 goto error1;
2102
2103 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2104 CM_MSG_RESPONSE_REP, service_timeout,
2105 private_data, private_data_len);
2106 ret = ib_post_send_mad(msg, NULL);
2107 if (ret)
2108 goto error2;
2109 cm_id->state = IB_CM_MRA_REP_SENT;
2110 break;
2111 case IB_CM_ESTABLISHED:
2112 ret = cm_alloc_msg(cm_id_priv, &msg);
2113 if (ret)
2114 goto error1;
2115
2116 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2117 CM_MSG_RESPONSE_OTHER, service_timeout,
2118 private_data, private_data_len);
2119 ret = ib_post_send_mad(msg, NULL);
2120 if (ret)
2121 goto error2;
2122 cm_id->lap_state = IB_CM_MRA_LAP_SENT;
2123 break;
2124 default:
2125 ret = -EINVAL;
2126 goto error1;
2127 }
2128 cm_id_priv->service_timeout = service_timeout;
2129 cm_set_private_data(cm_id_priv, data, private_data_len);
2130 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2131 return 0;
2132
2133 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2134 kfree(data);
2135 return ret;
2136
2137 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2138 kfree(data);
2139 cm_free_msg(msg);
2140 return ret;
2141 }
2142 EXPORT_SYMBOL(ib_send_cm_mra);
2143
2144 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2145 {
2146 switch (cm_mra_get_msg_mraed(mra_msg)) {
2147 case CM_MSG_RESPONSE_REQ:
2148 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2149 case CM_MSG_RESPONSE_REP:
2150 case CM_MSG_RESPONSE_OTHER:
2151 return cm_acquire_id(mra_msg->remote_comm_id,
2152 mra_msg->local_comm_id);
2153 default:
2154 return NULL;
2155 }
2156 }
2157
2158 static int cm_mra_handler(struct cm_work *work)
2159 {
2160 struct cm_id_private *cm_id_priv;
2161 struct cm_mra_msg *mra_msg;
2162 unsigned long flags;
2163 int timeout, ret;
2164
2165 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2166 cm_id_priv = cm_acquire_mraed_id(mra_msg);
2167 if (!cm_id_priv)
2168 return -EINVAL;
2169
2170 work->cm_event.private_data = &mra_msg->private_data;
2171 work->cm_event.param.mra_rcvd.service_timeout =
2172 cm_mra_get_service_timeout(mra_msg);
2173 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2174 cm_convert_to_ms(cm_id_priv->av.packet_life_time);
2175
2176 spin_lock_irqsave(&cm_id_priv->lock, flags);
2177 switch (cm_id_priv->id.state) {
2178 case IB_CM_REQ_SENT:
2179 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2180 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2181 cm_id_priv->msg, timeout))
2182 goto out;
2183 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2184 break;
2185 case IB_CM_REP_SENT:
2186 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2187 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2188 cm_id_priv->msg, timeout))
2189 goto out;
2190 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2191 break;
2192 case IB_CM_ESTABLISHED:
2193 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2194 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2195 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2196 cm_id_priv->msg, timeout))
2197 goto out;
2198 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2199 break;
2200 default:
2201 goto out;
2202 }
2203
2204 cm_id_priv->msg->context[1] = (void *) (unsigned long)
2205 cm_id_priv->id.state;
2206 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2207 if (!ret)
2208 list_add_tail(&work->list, &cm_id_priv->work_list);
2209 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2210
2211 if (ret)
2212 cm_process_work(cm_id_priv, work);
2213 else
2214 cm_deref_id(cm_id_priv);
2215 return 0;
2216 out:
2217 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2218 cm_deref_id(cm_id_priv);
2219 return -EINVAL;
2220 }
2221
2222 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2223 struct cm_id_private *cm_id_priv,
2224 struct ib_sa_path_rec *alternate_path,
2225 const void *private_data,
2226 u8 private_data_len)
2227 {
2228 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2229 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2230 lap_msg->local_comm_id = cm_id_priv->id.local_id;
2231 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2232 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2233 /* todo: need remote CM response timeout */
2234 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2235 lap_msg->alt_local_lid = alternate_path->slid;
2236 lap_msg->alt_remote_lid = alternate_path->dlid;
2237 lap_msg->alt_local_gid = alternate_path->sgid;
2238 lap_msg->alt_remote_gid = alternate_path->dgid;
2239 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2240 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2241 lap_msg->alt_hop_limit = alternate_path->hop_limit;
2242 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2243 cm_lap_set_sl(lap_msg, alternate_path->sl);
2244 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2245 cm_lap_set_local_ack_timeout(lap_msg,
2246 min(31, alternate_path->packet_life_time + 1));
2247
2248 if (private_data && private_data_len)
2249 memcpy(lap_msg->private_data, private_data, private_data_len);
2250 }
2251
2252 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2253 struct ib_sa_path_rec *alternate_path,
2254 const void *private_data,
2255 u8 private_data_len)
2256 {
2257 struct cm_id_private *cm_id_priv;
2258 struct ib_mad_send_buf *msg;
2259 unsigned long flags;
2260 int ret;
2261
2262 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2263 return -EINVAL;
2264
2265 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2266 spin_lock_irqsave(&cm_id_priv->lock, flags);
2267 if (cm_id->state != IB_CM_ESTABLISHED ||
2268 cm_id->lap_state != IB_CM_LAP_IDLE) {
2269 ret = -EINVAL;
2270 goto out;
2271 }
2272
2273 ret = cm_alloc_msg(cm_id_priv, &msg);
2274 if (ret)
2275 goto out;
2276
2277 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2278 alternate_path, private_data, private_data_len);
2279 msg->timeout_ms = cm_id_priv->timeout_ms;
2280 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2281
2282 ret = ib_post_send_mad(msg, NULL);
2283 if (ret) {
2284 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2285 cm_free_msg(msg);
2286 return ret;
2287 }
2288
2289 cm_id->lap_state = IB_CM_LAP_SENT;
2290 cm_id_priv->msg = msg;
2291
2292 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2293 return ret;
2294 }
2295 EXPORT_SYMBOL(ib_send_cm_lap);
2296
2297 static void cm_format_path_from_lap(struct ib_sa_path_rec *path,
2298 struct cm_lap_msg *lap_msg)
2299 {
2300 memset(path, 0, sizeof *path);
2301 path->dgid = lap_msg->alt_local_gid;
2302 path->sgid = lap_msg->alt_remote_gid;
2303 path->dlid = lap_msg->alt_local_lid;
2304 path->slid = lap_msg->alt_remote_lid;
2305 path->flow_label = cm_lap_get_flow_label(lap_msg);
2306 path->hop_limit = lap_msg->alt_hop_limit;
2307 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2308 path->reversible = 1;
2309 /* pkey is same as in REQ */
2310 path->sl = cm_lap_get_sl(lap_msg);
2311 path->mtu_selector = IB_SA_EQ;
2312 /* mtu is same as in REQ */
2313 path->rate_selector = IB_SA_EQ;
2314 path->rate = cm_lap_get_packet_rate(lap_msg);
2315 path->packet_life_time_selector = IB_SA_EQ;
2316 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2317 path->packet_life_time -= (path->packet_life_time > 0);
2318 }
2319
2320 static int cm_lap_handler(struct cm_work *work)
2321 {
2322 struct cm_id_private *cm_id_priv;
2323 struct cm_lap_msg *lap_msg;
2324 struct ib_cm_lap_event_param *param;
2325 struct ib_mad_send_buf *msg = NULL;
2326 unsigned long flags;
2327 int ret;
2328
2329 /* todo: verify LAP request and send reject APR if invalid. */
2330 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2331 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2332 lap_msg->local_comm_id);
2333 if (!cm_id_priv)
2334 return -EINVAL;
2335
2336 param = &work->cm_event.param.lap_rcvd;
2337 param->alternate_path = &work->path[0];
2338 cm_format_path_from_lap(param->alternate_path, lap_msg);
2339 work->cm_event.private_data = &lap_msg->private_data;
2340
2341 spin_lock_irqsave(&cm_id_priv->lock, flags);
2342 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2343 goto unlock;
2344
2345 switch (cm_id_priv->id.lap_state) {
2346 case IB_CM_LAP_IDLE:
2347 break;
2348 case IB_CM_MRA_LAP_SENT:
2349 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2350 goto unlock;
2351
2352 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2353 CM_MSG_RESPONSE_OTHER,
2354 cm_id_priv->service_timeout,
2355 cm_id_priv->private_data,
2356 cm_id_priv->private_data_len);
2357 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2358
2359 if (ib_post_send_mad(msg, NULL))
2360 cm_free_msg(msg);
2361 goto deref;
2362 default:
2363 goto unlock;
2364 }
2365
2366 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2367 cm_id_priv->tid = lap_msg->hdr.tid;
2368 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2369 if (!ret)
2370 list_add_tail(&work->list, &cm_id_priv->work_list);
2371 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2372
2373 if (ret)
2374 cm_process_work(cm_id_priv, work);
2375 else
2376 cm_deref_id(cm_id_priv);
2377 return 0;
2378
2379 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2380 deref: cm_deref_id(cm_id_priv);
2381 return -EINVAL;
2382 }
2383
2384 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2385 struct cm_id_private *cm_id_priv,
2386 enum ib_cm_apr_status status,
2387 void *info,
2388 u8 info_length,
2389 const void *private_data,
2390 u8 private_data_len)
2391 {
2392 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2393 apr_msg->local_comm_id = cm_id_priv->id.local_id;
2394 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2395 apr_msg->ap_status = (u8) status;
2396
2397 if (info && info_length) {
2398 apr_msg->info_length = info_length;
2399 memcpy(apr_msg->info, info, info_length);
2400 }
2401
2402 if (private_data && private_data_len)
2403 memcpy(apr_msg->private_data, private_data, private_data_len);
2404 }
2405
2406 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2407 enum ib_cm_apr_status status,
2408 void *info,
2409 u8 info_length,
2410 const void *private_data,
2411 u8 private_data_len)
2412 {
2413 struct cm_id_private *cm_id_priv;
2414 struct ib_mad_send_buf *msg;
2415 unsigned long flags;
2416 int ret;
2417
2418 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2419 (info && info_length > IB_CM_APR_INFO_LENGTH))
2420 return -EINVAL;
2421
2422 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2423 spin_lock_irqsave(&cm_id_priv->lock, flags);
2424 if (cm_id->state != IB_CM_ESTABLISHED ||
2425 (cm_id->lap_state != IB_CM_LAP_RCVD &&
2426 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2427 ret = -EINVAL;
2428 goto out;
2429 }
2430
2431 ret = cm_alloc_msg(cm_id_priv, &msg);
2432 if (ret)
2433 goto out;
2434
2435 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2436 info, info_length, private_data, private_data_len);
2437 ret = ib_post_send_mad(msg, NULL);
2438 if (ret) {
2439 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2440 cm_free_msg(msg);
2441 return ret;
2442 }
2443
2444 cm_id->lap_state = IB_CM_LAP_IDLE;
2445 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2446 return ret;
2447 }
2448 EXPORT_SYMBOL(ib_send_cm_apr);
2449
2450 static int cm_apr_handler(struct cm_work *work)
2451 {
2452 struct cm_id_private *cm_id_priv;
2453 struct cm_apr_msg *apr_msg;
2454 unsigned long flags;
2455 int ret;
2456
2457 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2458 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2459 apr_msg->local_comm_id);
2460 if (!cm_id_priv)
2461 return -EINVAL; /* Unmatched reply. */
2462
2463 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2464 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2465 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2466 work->cm_event.private_data = &apr_msg->private_data;
2467
2468 spin_lock_irqsave(&cm_id_priv->lock, flags);
2469 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2470 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2471 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2472 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2473 goto out;
2474 }
2475 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2476 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2477 cm_id_priv->msg = NULL;
2478
2479 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2480 if (!ret)
2481 list_add_tail(&work->list, &cm_id_priv->work_list);
2482 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2483
2484 if (ret)
2485 cm_process_work(cm_id_priv, work);
2486 else
2487 cm_deref_id(cm_id_priv);
2488 return 0;
2489 out:
2490 cm_deref_id(cm_id_priv);
2491 return -EINVAL;
2492 }
2493
2494 static int cm_timewait_handler(struct cm_work *work)
2495 {
2496 struct cm_timewait_info *timewait_info;
2497 struct cm_id_private *cm_id_priv;
2498 unsigned long flags;
2499 int ret;
2500
2501 timewait_info = (struct cm_timewait_info *)work;
2502 cm_cleanup_timewait(timewait_info);
2503
2504 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2505 timewait_info->work.remote_id);
2506 if (!cm_id_priv)
2507 return -EINVAL;
2508
2509 spin_lock_irqsave(&cm_id_priv->lock, flags);
2510 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2511 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2512 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2513 goto out;
2514 }
2515 cm_id_priv->id.state = IB_CM_IDLE;
2516 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2517 if (!ret)
2518 list_add_tail(&work->list, &cm_id_priv->work_list);
2519 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2520
2521 if (ret)
2522 cm_process_work(cm_id_priv, work);
2523 else
2524 cm_deref_id(cm_id_priv);
2525 return 0;
2526 out:
2527 cm_deref_id(cm_id_priv);
2528 return -EINVAL;
2529 }
2530
2531 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2532 struct cm_id_private *cm_id_priv,
2533 struct ib_cm_sidr_req_param *param)
2534 {
2535 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2536 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2537 sidr_req_msg->request_id = cm_id_priv->id.local_id;
2538 sidr_req_msg->pkey = cpu_to_be16(param->pkey);
2539 sidr_req_msg->service_id = param->service_id;
2540
2541 if (param->private_data && param->private_data_len)
2542 memcpy(sidr_req_msg->private_data, param->private_data,
2543 param->private_data_len);
2544 }
2545
2546 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2547 struct ib_cm_sidr_req_param *param)
2548 {
2549 struct cm_id_private *cm_id_priv;
2550 struct ib_mad_send_buf *msg;
2551 unsigned long flags;
2552 int ret;
2553
2554 if (!param->path || (param->private_data &&
2555 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2556 return -EINVAL;
2557
2558 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2559 ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2560 if (ret)
2561 goto out;
2562
2563 cm_id->service_id = param->service_id;
2564 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
2565 cm_id_priv->timeout_ms = param->timeout_ms;
2566 cm_id_priv->max_cm_retries = param->max_cm_retries;
2567 ret = cm_alloc_msg(cm_id_priv, &msg);
2568 if (ret)
2569 goto out;
2570
2571 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2572 param);
2573 msg->timeout_ms = cm_id_priv->timeout_ms;
2574 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2575
2576 spin_lock_irqsave(&cm_id_priv->lock, flags);
2577 if (cm_id->state == IB_CM_IDLE)
2578 ret = ib_post_send_mad(msg, NULL);
2579 else
2580 ret = -EINVAL;
2581
2582 if (ret) {
2583 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2584 cm_free_msg(msg);
2585 goto out;
2586 }
2587 cm_id->state = IB_CM_SIDR_REQ_SENT;
2588 cm_id_priv->msg = msg;
2589 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2590 out:
2591 return ret;
2592 }
2593 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2594
2595 static void cm_format_sidr_req_event(struct cm_work *work,
2596 struct ib_cm_id *listen_id)
2597 {
2598 struct cm_sidr_req_msg *sidr_req_msg;
2599 struct ib_cm_sidr_req_event_param *param;
2600
2601 sidr_req_msg = (struct cm_sidr_req_msg *)
2602 work->mad_recv_wc->recv_buf.mad;
2603 param = &work->cm_event.param.sidr_req_rcvd;
2604 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2605 param->listen_id = listen_id;
2606 param->port = work->port->port_num;
2607 work->cm_event.private_data = &sidr_req_msg->private_data;
2608 }
2609
2610 static int cm_sidr_req_handler(struct cm_work *work)
2611 {
2612 struct ib_cm_id *cm_id;
2613 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2614 struct cm_sidr_req_msg *sidr_req_msg;
2615 struct ib_wc *wc;
2616 unsigned long flags;
2617
2618 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
2619 if (IS_ERR(cm_id))
2620 return PTR_ERR(cm_id);
2621 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2622
2623 /* Record SGID/SLID and request ID for lookup. */
2624 sidr_req_msg = (struct cm_sidr_req_msg *)
2625 work->mad_recv_wc->recv_buf.mad;
2626 wc = work->mad_recv_wc->wc;
2627 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2628 cm_id_priv->av.dgid.global.interface_id = 0;
2629 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2630 &cm_id_priv->av);
2631 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2632 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
2633 cm_id_priv->tid = sidr_req_msg->hdr.tid;
2634 atomic_inc(&cm_id_priv->work_count);
2635
2636 spin_lock_irqsave(&cm.lock, flags);
2637 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2638 if (cur_cm_id_priv) {
2639 spin_unlock_irqrestore(&cm.lock, flags);
2640 goto out; /* Duplicate message. */
2641 }
2642 cur_cm_id_priv = cm_find_listen(cm_id->device,
2643 sidr_req_msg->service_id);
2644 if (!cur_cm_id_priv) {
2645 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2646 spin_unlock_irqrestore(&cm.lock, flags);
2647 /* todo: reply with no match */
2648 goto out; /* No match. */
2649 }
2650 atomic_inc(&cur_cm_id_priv->refcount);
2651 spin_unlock_irqrestore(&cm.lock, flags);
2652
2653 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2654 cm_id_priv->id.context = cur_cm_id_priv->id.context;
2655 cm_id_priv->id.service_id = sidr_req_msg->service_id;
2656 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
2657
2658 cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2659 cm_process_work(cm_id_priv, work);
2660 cm_deref_id(cur_cm_id_priv);
2661 return 0;
2662 out:
2663 ib_destroy_cm_id(&cm_id_priv->id);
2664 return -EINVAL;
2665 }
2666
2667 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
2668 struct cm_id_private *cm_id_priv,
2669 struct ib_cm_sidr_rep_param *param)
2670 {
2671 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
2672 cm_id_priv->tid);
2673 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
2674 sidr_rep_msg->status = param->status;
2675 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
2676 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
2677 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
2678
2679 if (param->info && param->info_length)
2680 memcpy(sidr_rep_msg->info, param->info, param->info_length);
2681
2682 if (param->private_data && param->private_data_len)
2683 memcpy(sidr_rep_msg->private_data, param->private_data,
2684 param->private_data_len);
2685 }
2686
2687 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
2688 struct ib_cm_sidr_rep_param *param)
2689 {
2690 struct cm_id_private *cm_id_priv;
2691 struct ib_mad_send_buf *msg;
2692 unsigned long flags;
2693 int ret;
2694
2695 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
2696 (param->private_data &&
2697 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
2698 return -EINVAL;
2699
2700 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2701 spin_lock_irqsave(&cm_id_priv->lock, flags);
2702 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
2703 ret = -EINVAL;
2704 goto error;
2705 }
2706
2707 ret = cm_alloc_msg(cm_id_priv, &msg);
2708 if (ret)
2709 goto error;
2710
2711 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
2712 param);
2713 ret = ib_post_send_mad(msg, NULL);
2714 if (ret) {
2715 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2716 cm_free_msg(msg);
2717 return ret;
2718 }
2719 cm_id->state = IB_CM_IDLE;
2720 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2721
2722 spin_lock_irqsave(&cm.lock, flags);
2723 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2724 spin_unlock_irqrestore(&cm.lock, flags);
2725 return 0;
2726
2727 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2728 return ret;
2729 }
2730 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
2731
2732 static void cm_format_sidr_rep_event(struct cm_work *work)
2733 {
2734 struct cm_sidr_rep_msg *sidr_rep_msg;
2735 struct ib_cm_sidr_rep_event_param *param;
2736
2737 sidr_rep_msg = (struct cm_sidr_rep_msg *)
2738 work->mad_recv_wc->recv_buf.mad;
2739 param = &work->cm_event.param.sidr_rep_rcvd;
2740 param->status = sidr_rep_msg->status;
2741 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
2742 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
2743 param->info = &sidr_rep_msg->info;
2744 param->info_len = sidr_rep_msg->info_length;
2745 work->cm_event.private_data = &sidr_rep_msg->private_data;
2746 }
2747
2748 static int cm_sidr_rep_handler(struct cm_work *work)
2749 {
2750 struct cm_sidr_rep_msg *sidr_rep_msg;
2751 struct cm_id_private *cm_id_priv;
2752 unsigned long flags;
2753
2754 sidr_rep_msg = (struct cm_sidr_rep_msg *)
2755 work->mad_recv_wc->recv_buf.mad;
2756 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
2757 if (!cm_id_priv)
2758 return -EINVAL; /* Unmatched reply. */
2759
2760 spin_lock_irqsave(&cm_id_priv->lock, flags);
2761 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
2762 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2763 goto out;
2764 }
2765 cm_id_priv->id.state = IB_CM_IDLE;
2766 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2767 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2768
2769 cm_format_sidr_rep_event(work);
2770 cm_process_work(cm_id_priv, work);
2771 return 0;
2772 out:
2773 cm_deref_id(cm_id_priv);
2774 return -EINVAL;
2775 }
2776
2777 static void cm_process_send_error(struct ib_mad_send_buf *msg,
2778 enum ib_wc_status wc_status)
2779 {
2780 struct cm_id_private *cm_id_priv;
2781 struct ib_cm_event cm_event;
2782 enum ib_cm_state state;
2783 unsigned long flags;
2784 int ret;
2785
2786 memset(&cm_event, 0, sizeof cm_event);
2787 cm_id_priv = msg->context[0];
2788
2789 /* Discard old sends or ones without a response. */
2790 spin_lock_irqsave(&cm_id_priv->lock, flags);
2791 state = (enum ib_cm_state) (unsigned long) msg->context[1];
2792 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
2793 goto discard;
2794
2795 switch (state) {
2796 case IB_CM_REQ_SENT:
2797 case IB_CM_MRA_REQ_RCVD:
2798 cm_reset_to_idle(cm_id_priv);
2799 cm_event.event = IB_CM_REQ_ERROR;
2800 break;
2801 case IB_CM_REP_SENT:
2802 case IB_CM_MRA_REP_RCVD:
2803 cm_reset_to_idle(cm_id_priv);
2804 cm_event.event = IB_CM_REP_ERROR;
2805 break;
2806 case IB_CM_DREQ_SENT:
2807 cm_enter_timewait(cm_id_priv);
2808 cm_event.event = IB_CM_DREQ_ERROR;
2809 break;
2810 case IB_CM_SIDR_REQ_SENT:
2811 cm_id_priv->id.state = IB_CM_IDLE;
2812 cm_event.event = IB_CM_SIDR_REQ_ERROR;
2813 break;
2814 default:
2815 goto discard;
2816 }
2817 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2818 cm_event.param.send_status = wc_status;
2819
2820 /* No other events can occur on the cm_id at this point. */
2821 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
2822 cm_free_msg(msg);
2823 if (ret)
2824 ib_destroy_cm_id(&cm_id_priv->id);
2825 return;
2826 discard:
2827 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2828 cm_free_msg(msg);
2829 }
2830
2831 static void cm_send_handler(struct ib_mad_agent *mad_agent,
2832 struct ib_mad_send_wc *mad_send_wc)
2833 {
2834 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
2835
2836 switch (mad_send_wc->status) {
2837 case IB_WC_SUCCESS:
2838 case IB_WC_WR_FLUSH_ERR:
2839 cm_free_msg(msg);
2840 break;
2841 default:
2842 if (msg->context[0] && msg->context[1])
2843 cm_process_send_error(msg, mad_send_wc->status);
2844 else
2845 cm_free_msg(msg);
2846 break;
2847 }
2848 }
2849
2850 static void cm_work_handler(void *data)
2851 {
2852 struct cm_work *work = data;
2853 int ret;
2854
2855 switch (work->cm_event.event) {
2856 case IB_CM_REQ_RECEIVED:
2857 ret = cm_req_handler(work);
2858 break;
2859 case IB_CM_MRA_RECEIVED:
2860 ret = cm_mra_handler(work);
2861 break;
2862 case IB_CM_REJ_RECEIVED:
2863 ret = cm_rej_handler(work);
2864 break;
2865 case IB_CM_REP_RECEIVED:
2866 ret = cm_rep_handler(work);
2867 break;
2868 case IB_CM_RTU_RECEIVED:
2869 ret = cm_rtu_handler(work);
2870 break;
2871 case IB_CM_USER_ESTABLISHED:
2872 ret = cm_establish_handler(work);
2873 break;
2874 case IB_CM_DREQ_RECEIVED:
2875 ret = cm_dreq_handler(work);
2876 break;
2877 case IB_CM_DREP_RECEIVED:
2878 ret = cm_drep_handler(work);
2879 break;
2880 case IB_CM_SIDR_REQ_RECEIVED:
2881 ret = cm_sidr_req_handler(work);
2882 break;
2883 case IB_CM_SIDR_REP_RECEIVED:
2884 ret = cm_sidr_rep_handler(work);
2885 break;
2886 case IB_CM_LAP_RECEIVED:
2887 ret = cm_lap_handler(work);
2888 break;
2889 case IB_CM_APR_RECEIVED:
2890 ret = cm_apr_handler(work);
2891 break;
2892 case IB_CM_TIMEWAIT_EXIT:
2893 ret = cm_timewait_handler(work);
2894 break;
2895 default:
2896 ret = -EINVAL;
2897 break;
2898 }
2899 if (ret)
2900 cm_free_work(work);
2901 }
2902
2903 int ib_cm_establish(struct ib_cm_id *cm_id)
2904 {
2905 struct cm_id_private *cm_id_priv;
2906 struct cm_work *work;
2907 unsigned long flags;
2908 int ret = 0;
2909
2910 work = kmalloc(sizeof *work, GFP_ATOMIC);
2911 if (!work)
2912 return -ENOMEM;
2913
2914 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2915 spin_lock_irqsave(&cm_id_priv->lock, flags);
2916 switch (cm_id->state)
2917 {
2918 case IB_CM_REP_SENT:
2919 case IB_CM_MRA_REP_RCVD:
2920 cm_id->state = IB_CM_ESTABLISHED;
2921 break;
2922 case IB_CM_ESTABLISHED:
2923 ret = -EISCONN;
2924 break;
2925 default:
2926 ret = -EINVAL;
2927 break;
2928 }
2929 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2930
2931 if (ret) {
2932 kfree(work);
2933 goto out;
2934 }
2935
2936 /*
2937 * The CM worker thread may try to destroy the cm_id before it
2938 * can execute this work item. To prevent potential deadlock,
2939 * we need to find the cm_id once we're in the context of the
2940 * worker thread, rather than holding a reference on it.
2941 */
2942 INIT_WORK(&work->work, cm_work_handler, work);
2943 work->local_id = cm_id->local_id;
2944 work->remote_id = cm_id->remote_id;
2945 work->mad_recv_wc = NULL;
2946 work->cm_event.event = IB_CM_USER_ESTABLISHED;
2947 queue_work(cm.wq, &work->work);
2948 out:
2949 return ret;
2950 }
2951 EXPORT_SYMBOL(ib_cm_establish);
2952
2953 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
2954 struct ib_mad_recv_wc *mad_recv_wc)
2955 {
2956 struct cm_work *work;
2957 enum ib_cm_event_type event;
2958 int paths = 0;
2959
2960 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
2961 case CM_REQ_ATTR_ID:
2962 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
2963 alt_local_lid != 0);
2964 event = IB_CM_REQ_RECEIVED;
2965 break;
2966 case CM_MRA_ATTR_ID:
2967 event = IB_CM_MRA_RECEIVED;
2968 break;
2969 case CM_REJ_ATTR_ID:
2970 event = IB_CM_REJ_RECEIVED;
2971 break;
2972 case CM_REP_ATTR_ID:
2973 event = IB_CM_REP_RECEIVED;
2974 break;
2975 case CM_RTU_ATTR_ID:
2976 event = IB_CM_RTU_RECEIVED;
2977 break;
2978 case CM_DREQ_ATTR_ID:
2979 event = IB_CM_DREQ_RECEIVED;
2980 break;
2981 case CM_DREP_ATTR_ID:
2982 event = IB_CM_DREP_RECEIVED;
2983 break;
2984 case CM_SIDR_REQ_ATTR_ID:
2985 event = IB_CM_SIDR_REQ_RECEIVED;
2986 break;
2987 case CM_SIDR_REP_ATTR_ID:
2988 event = IB_CM_SIDR_REP_RECEIVED;
2989 break;
2990 case CM_LAP_ATTR_ID:
2991 paths = 1;
2992 event = IB_CM_LAP_RECEIVED;
2993 break;
2994 case CM_APR_ATTR_ID:
2995 event = IB_CM_APR_RECEIVED;
2996 break;
2997 default:
2998 ib_free_recv_mad(mad_recv_wc);
2999 return;
3000 }
3001
3002 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3003 GFP_KERNEL);
3004 if (!work) {
3005 ib_free_recv_mad(mad_recv_wc);
3006 return;
3007 }
3008
3009 INIT_WORK(&work->work, cm_work_handler, work);
3010 work->cm_event.event = event;
3011 work->mad_recv_wc = mad_recv_wc;
3012 work->port = (struct cm_port *)mad_agent->context;
3013 queue_work(cm.wq, &work->work);
3014 }
3015
3016 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3017 struct ib_qp_attr *qp_attr,
3018 int *qp_attr_mask)
3019 {
3020 unsigned long flags;
3021 int ret;
3022
3023 spin_lock_irqsave(&cm_id_priv->lock, flags);
3024 switch (cm_id_priv->id.state) {
3025 case IB_CM_REQ_SENT:
3026 case IB_CM_MRA_REQ_RCVD:
3027 case IB_CM_REQ_RCVD:
3028 case IB_CM_MRA_REQ_SENT:
3029 case IB_CM_REP_RCVD:
3030 case IB_CM_MRA_REP_SENT:
3031 case IB_CM_REP_SENT:
3032 case IB_CM_MRA_REP_RCVD:
3033 case IB_CM_ESTABLISHED:
3034 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3035 IB_QP_PKEY_INDEX | IB_QP_PORT;
3036 qp_attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE |
3037 IB_ACCESS_REMOTE_WRITE;
3038 if (cm_id_priv->responder_resources)
3039 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ;
3040 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3041 qp_attr->port_num = cm_id_priv->av.port->port_num;
3042 ret = 0;
3043 break;
3044 default:
3045 ret = -EINVAL;
3046 break;
3047 }
3048 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3049 return ret;
3050 }
3051
3052 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3053 struct ib_qp_attr *qp_attr,
3054 int *qp_attr_mask)
3055 {
3056 unsigned long flags;
3057 int ret;
3058
3059 spin_lock_irqsave(&cm_id_priv->lock, flags);
3060 switch (cm_id_priv->id.state) {
3061 case IB_CM_REQ_RCVD:
3062 case IB_CM_MRA_REQ_SENT:
3063 case IB_CM_REP_RCVD:
3064 case IB_CM_MRA_REP_SENT:
3065 case IB_CM_REP_SENT:
3066 case IB_CM_MRA_REP_RCVD:
3067 case IB_CM_ESTABLISHED:
3068 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3069 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3070 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3071 qp_attr->path_mtu = cm_id_priv->path_mtu;
3072 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3073 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3074 if (cm_id_priv->qp_type == IB_QPT_RC) {
3075 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3076 IB_QP_MIN_RNR_TIMER;
3077 qp_attr->max_dest_rd_atomic =
3078 cm_id_priv->responder_resources;
3079 qp_attr->min_rnr_timer = 0;
3080 }
3081 if (cm_id_priv->alt_av.ah_attr.dlid) {
3082 *qp_attr_mask |= IB_QP_ALT_PATH;
3083 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3084 }
3085 ret = 0;
3086 break;
3087 default:
3088 ret = -EINVAL;
3089 break;
3090 }
3091 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3092 return ret;
3093 }
3094
3095 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3096 struct ib_qp_attr *qp_attr,
3097 int *qp_attr_mask)
3098 {
3099 unsigned long flags;
3100 int ret;
3101
3102 spin_lock_irqsave(&cm_id_priv->lock, flags);
3103 switch (cm_id_priv->id.state) {
3104 case IB_CM_REP_RCVD:
3105 case IB_CM_MRA_REP_SENT:
3106 case IB_CM_REP_SENT:
3107 case IB_CM_MRA_REP_RCVD:
3108 case IB_CM_ESTABLISHED:
3109 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3110 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3111 if (cm_id_priv->qp_type == IB_QPT_RC) {
3112 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3113 IB_QP_RNR_RETRY |
3114 IB_QP_MAX_QP_RD_ATOMIC;
3115 qp_attr->timeout = cm_id_priv->local_ack_timeout;
3116 qp_attr->retry_cnt = cm_id_priv->retry_count;
3117 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3118 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3119 }
3120 if (cm_id_priv->alt_av.ah_attr.dlid) {
3121 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3122 qp_attr->path_mig_state = IB_MIG_REARM;
3123 }
3124 ret = 0;
3125 break;
3126 default:
3127 ret = -EINVAL;
3128 break;
3129 }
3130 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3131 return ret;
3132 }
3133
3134 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3135 struct ib_qp_attr *qp_attr,
3136 int *qp_attr_mask)
3137 {
3138 struct cm_id_private *cm_id_priv;
3139 int ret;
3140
3141 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3142 switch (qp_attr->qp_state) {
3143 case IB_QPS_INIT:
3144 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3145 break;
3146 case IB_QPS_RTR:
3147 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3148 break;
3149 case IB_QPS_RTS:
3150 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3151 break;
3152 default:
3153 ret = -EINVAL;
3154 break;
3155 }
3156 return ret;
3157 }
3158 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3159
3160 static __be64 cm_get_ca_guid(struct ib_device *device)
3161 {
3162 struct ib_device_attr *device_attr;
3163 __be64 guid;
3164 int ret;
3165
3166 device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
3167 if (!device_attr)
3168 return 0;
3169
3170 ret = ib_query_device(device, device_attr);
3171 guid = ret ? 0 : device_attr->node_guid;
3172 kfree(device_attr);
3173 return guid;
3174 }
3175
3176 static void cm_add_one(struct ib_device *device)
3177 {
3178 struct cm_device *cm_dev;
3179 struct cm_port *port;
3180 struct ib_mad_reg_req reg_req = {
3181 .mgmt_class = IB_MGMT_CLASS_CM,
3182 .mgmt_class_version = IB_CM_CLASS_VERSION
3183 };
3184 struct ib_port_modify port_modify = {
3185 .set_port_cap_mask = IB_PORT_CM_SUP
3186 };
3187 unsigned long flags;
3188 int ret;
3189 u8 i;
3190
3191 cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) *
3192 device->phys_port_cnt, GFP_KERNEL);
3193 if (!cm_dev)
3194 return;
3195
3196 cm_dev->device = device;
3197 cm_dev->ca_guid = cm_get_ca_guid(device);
3198 if (!cm_dev->ca_guid)
3199 goto error1;
3200
3201 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3202 for (i = 1; i <= device->phys_port_cnt; i++) {
3203 port = &cm_dev->port[i-1];
3204 port->cm_dev = cm_dev;
3205 port->port_num = i;
3206 port->mad_agent = ib_register_mad_agent(device, i,
3207 IB_QPT_GSI,
3208 &reg_req,
3209 0,
3210 cm_send_handler,
3211 cm_recv_handler,
3212 port);
3213 if (IS_ERR(port->mad_agent))
3214 goto error2;
3215
3216 ret = ib_modify_port(device, i, 0, &port_modify);
3217 if (ret)
3218 goto error3;
3219 }
3220 ib_set_client_data(device, &cm_client, cm_dev);
3221
3222 write_lock_irqsave(&cm.device_lock, flags);
3223 list_add_tail(&cm_dev->list, &cm.device_list);
3224 write_unlock_irqrestore(&cm.device_lock, flags);
3225 return;
3226
3227 error3:
3228 ib_unregister_mad_agent(port->mad_agent);
3229 error2:
3230 port_modify.set_port_cap_mask = 0;
3231 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3232 while (--i) {
3233 port = &cm_dev->port[i-1];
3234 ib_modify_port(device, port->port_num, 0, &port_modify);
3235 ib_unregister_mad_agent(port->mad_agent);
3236 }
3237 error1:
3238 kfree(cm_dev);
3239 }
3240
3241 static void cm_remove_one(struct ib_device *device)
3242 {
3243 struct cm_device *cm_dev;
3244 struct cm_port *port;
3245 struct ib_port_modify port_modify = {
3246 .clr_port_cap_mask = IB_PORT_CM_SUP
3247 };
3248 unsigned long flags;
3249 int i;
3250
3251 cm_dev = ib_get_client_data(device, &cm_client);
3252 if (!cm_dev)
3253 return;
3254
3255 write_lock_irqsave(&cm.device_lock, flags);
3256 list_del(&cm_dev->list);
3257 write_unlock_irqrestore(&cm.device_lock, flags);
3258
3259 for (i = 1; i <= device->phys_port_cnt; i++) {
3260 port = &cm_dev->port[i-1];
3261 ib_modify_port(device, port->port_num, 0, &port_modify);
3262 ib_unregister_mad_agent(port->mad_agent);
3263 }
3264 kfree(cm_dev);
3265 }
3266
3267 static int __init ib_cm_init(void)
3268 {
3269 int ret;
3270
3271 memset(&cm, 0, sizeof cm);
3272 INIT_LIST_HEAD(&cm.device_list);
3273 rwlock_init(&cm.device_lock);
3274 spin_lock_init(&cm.lock);
3275 cm.listen_service_table = RB_ROOT;
3276 cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3277 cm.remote_id_table = RB_ROOT;
3278 cm.remote_qp_table = RB_ROOT;
3279 cm.remote_sidr_table = RB_ROOT;
3280 idr_init(&cm.local_id_table);
3281 idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3282
3283 cm.wq = create_workqueue("ib_cm");
3284 if (!cm.wq)
3285 return -ENOMEM;
3286
3287 ret = ib_register_client(&cm_client);
3288 if (ret)
3289 goto error;
3290
3291 return 0;
3292 error:
3293 destroy_workqueue(cm.wq);
3294 return ret;
3295 }
3296
3297 static void __exit ib_cm_cleanup(void)
3298 {
3299 flush_workqueue(cm.wq);
3300 destroy_workqueue(cm.wq);
3301 ib_unregister_client(&cm_client);
3302 idr_destroy(&cm.local_id_table);
3303 }
3304
3305 module_init(ib_cm_init);
3306 module_exit(ib_cm_cleanup);
3307
Linux 2.6 libata-dev (mirror)