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Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6
[deliverable/linux.git] / drivers / infiniband / core / cm.c
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 4311 2005-12-05 18:42:01Z sean.hefty $
36 */
37
38 #include <linux/completion.h>
39 #include <linux/dma-mapping.h>
40 #include <linux/err.h>
41 #include <linux/idr.h>
42 #include <linux/interrupt.h>
43 #include <linux/pci.h>
44 #include <linux/rbtree.h>
45 #include <linux/spinlock.h>
46 #include <linux/workqueue.h>
47
48 #include <rdma/ib_cache.h>
49 #include <rdma/ib_cm.h>
50 #include "cm_msgs.h"
51
52 MODULE_AUTHOR("Sean Hefty");
53 MODULE_DESCRIPTION("InfiniBand CM");
54 MODULE_LICENSE("Dual BSD/GPL");
55
56 static void cm_add_one(struct ib_device *device);
57 static void cm_remove_one(struct ib_device *device);
58
59 static struct ib_client cm_client = {
60 .name = "cm",
61 .add = cm_add_one,
62 .remove = cm_remove_one
63 };
64
65 static struct ib_cm {
66 spinlock_t lock;
67 struct list_head device_list;
68 rwlock_t device_lock;
69 struct rb_root listen_service_table;
70 u64 listen_service_id;
71 /* struct rb_root peer_service_table; todo: fix peer to peer */
72 struct rb_root remote_qp_table;
73 struct rb_root remote_id_table;
74 struct rb_root remote_sidr_table;
75 struct idr local_id_table;
76 struct workqueue_struct *wq;
77 } cm;
78
79 struct cm_port {
80 struct cm_device *cm_dev;
81 struct ib_mad_agent *mad_agent;
82 u8 port_num;
83 };
84
85 struct cm_device {
86 struct list_head list;
87 struct ib_device *device;
88 __be64 ca_guid;
89 struct cm_port port[0];
90 };
91
92 struct cm_av {
93 struct cm_port *port;
94 union ib_gid dgid;
95 struct ib_ah_attr ah_attr;
96 u16 pkey_index;
97 u8 packet_life_time;
98 };
99
100 struct cm_work {
101 struct work_struct work;
102 struct list_head list;
103 struct cm_port *port;
104 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
105 __be32 local_id; /* Established / timewait */
106 __be32 remote_id;
107 struct ib_cm_event cm_event;
108 struct ib_sa_path_rec path[0];
109 };
110
111 struct cm_timewait_info {
112 struct cm_work work; /* Must be first. */
113 struct rb_node remote_qp_node;
114 struct rb_node remote_id_node;
115 __be64 remote_ca_guid;
116 __be32 remote_qpn;
117 u8 inserted_remote_qp;
118 u8 inserted_remote_id;
119 };
120
121 struct cm_id_private {
122 struct ib_cm_id id;
123
124 struct rb_node service_node;
125 struct rb_node sidr_id_node;
126 spinlock_t lock; /* Do not acquire inside cm.lock */
127 struct completion comp;
128 atomic_t refcount;
129
130 struct ib_mad_send_buf *msg;
131 struct cm_timewait_info *timewait_info;
132 /* todo: use alternate port on send failure */
133 struct cm_av av;
134 struct cm_av alt_av;
135 struct ib_cm_compare_data *compare_data;
136
137 void *private_data;
138 __be64 tid;
139 __be32 local_qpn;
140 __be32 remote_qpn;
141 enum ib_qp_type qp_type;
142 __be32 sq_psn;
143 __be32 rq_psn;
144 int timeout_ms;
145 enum ib_mtu path_mtu;
146 u8 private_data_len;
147 u8 max_cm_retries;
148 u8 peer_to_peer;
149 u8 responder_resources;
150 u8 initiator_depth;
151 u8 local_ack_timeout;
152 u8 retry_count;
153 u8 rnr_retry_count;
154 u8 service_timeout;
155
156 struct list_head work_list;
157 atomic_t work_count;
158 };
159
160 static void cm_work_handler(void *data);
161
162 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
163 {
164 if (atomic_dec_and_test(&cm_id_priv->refcount))
165 complete(&cm_id_priv->comp);
166 }
167
168 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
169 struct ib_mad_send_buf **msg)
170 {
171 struct ib_mad_agent *mad_agent;
172 struct ib_mad_send_buf *m;
173 struct ib_ah *ah;
174
175 mad_agent = cm_id_priv->av.port->mad_agent;
176 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
177 if (IS_ERR(ah))
178 return PTR_ERR(ah);
179
180 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
181 cm_id_priv->av.pkey_index,
182 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
183 GFP_ATOMIC);
184 if (IS_ERR(m)) {
185 ib_destroy_ah(ah);
186 return PTR_ERR(m);
187 }
188
189 /* Timeout set by caller if response is expected. */
190 m->ah = ah;
191 m->retries = cm_id_priv->max_cm_retries;
192
193 atomic_inc(&cm_id_priv->refcount);
194 m->context[0] = cm_id_priv;
195 *msg = m;
196 return 0;
197 }
198
199 static int cm_alloc_response_msg(struct cm_port *port,
200 struct ib_mad_recv_wc *mad_recv_wc,
201 struct ib_mad_send_buf **msg)
202 {
203 struct ib_mad_send_buf *m;
204 struct ib_ah *ah;
205
206 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
207 mad_recv_wc->recv_buf.grh, port->port_num);
208 if (IS_ERR(ah))
209 return PTR_ERR(ah);
210
211 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
212 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
213 GFP_ATOMIC);
214 if (IS_ERR(m)) {
215 ib_destroy_ah(ah);
216 return PTR_ERR(m);
217 }
218 m->ah = ah;
219 *msg = m;
220 return 0;
221 }
222
223 static void cm_free_msg(struct ib_mad_send_buf *msg)
224 {
225 ib_destroy_ah(msg->ah);
226 if (msg->context[0])
227 cm_deref_id(msg->context[0]);
228 ib_free_send_mad(msg);
229 }
230
231 static void * cm_copy_private_data(const void *private_data,
232 u8 private_data_len)
233 {
234 void *data;
235
236 if (!private_data || !private_data_len)
237 return NULL;
238
239 data = kmalloc(private_data_len, GFP_KERNEL);
240 if (!data)
241 return ERR_PTR(-ENOMEM);
242
243 memcpy(data, private_data, private_data_len);
244 return data;
245 }
246
247 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
248 void *private_data, u8 private_data_len)
249 {
250 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
251 kfree(cm_id_priv->private_data);
252
253 cm_id_priv->private_data = private_data;
254 cm_id_priv->private_data_len = private_data_len;
255 }
256
257 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
258 struct ib_grh *grh, struct cm_av *av)
259 {
260 av->port = port;
261 av->pkey_index = wc->pkey_index;
262 ib_init_ah_from_wc(port->cm_dev->device, port->port_num, wc,
263 grh, &av->ah_attr);
264 }
265
266 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
267 {
268 struct cm_device *cm_dev;
269 struct cm_port *port = NULL;
270 unsigned long flags;
271 int ret;
272 u8 p;
273
274 read_lock_irqsave(&cm.device_lock, flags);
275 list_for_each_entry(cm_dev, &cm.device_list, list) {
276 if (!ib_find_cached_gid(cm_dev->device, &path->sgid,
277 &p, NULL)) {
278 port = &cm_dev->port[p-1];
279 break;
280 }
281 }
282 read_unlock_irqrestore(&cm.device_lock, flags);
283
284 if (!port)
285 return -EINVAL;
286
287 ret = ib_find_cached_pkey(cm_dev->device, port->port_num,
288 be16_to_cpu(path->pkey), &av->pkey_index);
289 if (ret)
290 return ret;
291
292 av->port = port;
293 ib_init_ah_from_path(cm_dev->device, port->port_num, path,
294 &av->ah_attr);
295 av->packet_life_time = path->packet_life_time;
296 return 0;
297 }
298
299 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
300 {
301 unsigned long flags;
302 int ret;
303 static int next_id;
304
305 do {
306 spin_lock_irqsave(&cm.lock, flags);
307 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, next_id++,
308 (__force int *) &cm_id_priv->id.local_id);
309 spin_unlock_irqrestore(&cm.lock, flags);
310 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
311 return ret;
312 }
313
314 static void cm_free_id(__be32 local_id)
315 {
316 unsigned long flags;
317
318 spin_lock_irqsave(&cm.lock, flags);
319 idr_remove(&cm.local_id_table, (__force int) local_id);
320 spin_unlock_irqrestore(&cm.lock, flags);
321 }
322
323 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
324 {
325 struct cm_id_private *cm_id_priv;
326
327 cm_id_priv = idr_find(&cm.local_id_table, (__force int) local_id);
328 if (cm_id_priv) {
329 if (cm_id_priv->id.remote_id == remote_id)
330 atomic_inc(&cm_id_priv->refcount);
331 else
332 cm_id_priv = NULL;
333 }
334
335 return cm_id_priv;
336 }
337
338 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
339 {
340 struct cm_id_private *cm_id_priv;
341 unsigned long flags;
342
343 spin_lock_irqsave(&cm.lock, flags);
344 cm_id_priv = cm_get_id(local_id, remote_id);
345 spin_unlock_irqrestore(&cm.lock, flags);
346
347 return cm_id_priv;
348 }
349
350 static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
351 {
352 int i;
353
354 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
355 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
356 ((unsigned long *) mask)[i];
357 }
358
359 static int cm_compare_data(struct ib_cm_compare_data *src_data,
360 struct ib_cm_compare_data *dst_data)
361 {
362 u8 src[IB_CM_COMPARE_SIZE];
363 u8 dst[IB_CM_COMPARE_SIZE];
364
365 if (!src_data || !dst_data)
366 return 0;
367
368 cm_mask_copy(src, src_data->data, dst_data->mask);
369 cm_mask_copy(dst, dst_data->data, src_data->mask);
370 return memcmp(src, dst, IB_CM_COMPARE_SIZE);
371 }
372
373 static int cm_compare_private_data(u8 *private_data,
374 struct ib_cm_compare_data *dst_data)
375 {
376 u8 src[IB_CM_COMPARE_SIZE];
377
378 if (!dst_data)
379 return 0;
380
381 cm_mask_copy(src, private_data, dst_data->mask);
382 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
383 }
384
385 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
386 {
387 struct rb_node **link = &cm.listen_service_table.rb_node;
388 struct rb_node *parent = NULL;
389 struct cm_id_private *cur_cm_id_priv;
390 __be64 service_id = cm_id_priv->id.service_id;
391 __be64 service_mask = cm_id_priv->id.service_mask;
392 int data_cmp;
393
394 while (*link) {
395 parent = *link;
396 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
397 service_node);
398 data_cmp = cm_compare_data(cm_id_priv->compare_data,
399 cur_cm_id_priv->compare_data);
400 if ((cur_cm_id_priv->id.service_mask & service_id) ==
401 (service_mask & cur_cm_id_priv->id.service_id) &&
402 (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
403 !data_cmp)
404 return cur_cm_id_priv;
405
406 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
407 link = &(*link)->rb_left;
408 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
409 link = &(*link)->rb_right;
410 else if (service_id < cur_cm_id_priv->id.service_id)
411 link = &(*link)->rb_left;
412 else if (service_id > cur_cm_id_priv->id.service_id)
413 link = &(*link)->rb_right;
414 else if (data_cmp < 0)
415 link = &(*link)->rb_left;
416 else
417 link = &(*link)->rb_right;
418 }
419 rb_link_node(&cm_id_priv->service_node, parent, link);
420 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
421 return NULL;
422 }
423
424 static struct cm_id_private * cm_find_listen(struct ib_device *device,
425 __be64 service_id,
426 u8 *private_data)
427 {
428 struct rb_node *node = cm.listen_service_table.rb_node;
429 struct cm_id_private *cm_id_priv;
430 int data_cmp;
431
432 while (node) {
433 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
434 data_cmp = cm_compare_private_data(private_data,
435 cm_id_priv->compare_data);
436 if ((cm_id_priv->id.service_mask & service_id) ==
437 cm_id_priv->id.service_id &&
438 (cm_id_priv->id.device == device) && !data_cmp)
439 return cm_id_priv;
440
441 if (device < cm_id_priv->id.device)
442 node = node->rb_left;
443 else if (device > cm_id_priv->id.device)
444 node = node->rb_right;
445 else if (service_id < cm_id_priv->id.service_id)
446 node = node->rb_left;
447 else if (service_id > cm_id_priv->id.service_id)
448 node = node->rb_right;
449 else if (data_cmp < 0)
450 node = node->rb_left;
451 else
452 node = node->rb_right;
453 }
454 return NULL;
455 }
456
457 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
458 *timewait_info)
459 {
460 struct rb_node **link = &cm.remote_id_table.rb_node;
461 struct rb_node *parent = NULL;
462 struct cm_timewait_info *cur_timewait_info;
463 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
464 __be32 remote_id = timewait_info->work.remote_id;
465
466 while (*link) {
467 parent = *link;
468 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
469 remote_id_node);
470 if (remote_id < cur_timewait_info->work.remote_id)
471 link = &(*link)->rb_left;
472 else if (remote_id > cur_timewait_info->work.remote_id)
473 link = &(*link)->rb_right;
474 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
475 link = &(*link)->rb_left;
476 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
477 link = &(*link)->rb_right;
478 else
479 return cur_timewait_info;
480 }
481 timewait_info->inserted_remote_id = 1;
482 rb_link_node(&timewait_info->remote_id_node, parent, link);
483 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
484 return NULL;
485 }
486
487 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
488 __be32 remote_id)
489 {
490 struct rb_node *node = cm.remote_id_table.rb_node;
491 struct cm_timewait_info *timewait_info;
492
493 while (node) {
494 timewait_info = rb_entry(node, struct cm_timewait_info,
495 remote_id_node);
496 if (remote_id < timewait_info->work.remote_id)
497 node = node->rb_left;
498 else if (remote_id > timewait_info->work.remote_id)
499 node = node->rb_right;
500 else if (remote_ca_guid < timewait_info->remote_ca_guid)
501 node = node->rb_left;
502 else if (remote_ca_guid > timewait_info->remote_ca_guid)
503 node = node->rb_right;
504 else
505 return timewait_info;
506 }
507 return NULL;
508 }
509
510 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
511 *timewait_info)
512 {
513 struct rb_node **link = &cm.remote_qp_table.rb_node;
514 struct rb_node *parent = NULL;
515 struct cm_timewait_info *cur_timewait_info;
516 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
517 __be32 remote_qpn = timewait_info->remote_qpn;
518
519 while (*link) {
520 parent = *link;
521 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
522 remote_qp_node);
523 if (remote_qpn < cur_timewait_info->remote_qpn)
524 link = &(*link)->rb_left;
525 else if (remote_qpn > cur_timewait_info->remote_qpn)
526 link = &(*link)->rb_right;
527 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
528 link = &(*link)->rb_left;
529 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
530 link = &(*link)->rb_right;
531 else
532 return cur_timewait_info;
533 }
534 timewait_info->inserted_remote_qp = 1;
535 rb_link_node(&timewait_info->remote_qp_node, parent, link);
536 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
537 return NULL;
538 }
539
540 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
541 *cm_id_priv)
542 {
543 struct rb_node **link = &cm.remote_sidr_table.rb_node;
544 struct rb_node *parent = NULL;
545 struct cm_id_private *cur_cm_id_priv;
546 union ib_gid *port_gid = &cm_id_priv->av.dgid;
547 __be32 remote_id = cm_id_priv->id.remote_id;
548
549 while (*link) {
550 parent = *link;
551 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
552 sidr_id_node);
553 if (remote_id < cur_cm_id_priv->id.remote_id)
554 link = &(*link)->rb_left;
555 else if (remote_id > cur_cm_id_priv->id.remote_id)
556 link = &(*link)->rb_right;
557 else {
558 int cmp;
559 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
560 sizeof *port_gid);
561 if (cmp < 0)
562 link = &(*link)->rb_left;
563 else if (cmp > 0)
564 link = &(*link)->rb_right;
565 else
566 return cur_cm_id_priv;
567 }
568 }
569 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
570 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
571 return NULL;
572 }
573
574 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
575 enum ib_cm_sidr_status status)
576 {
577 struct ib_cm_sidr_rep_param param;
578
579 memset(&param, 0, sizeof param);
580 param.status = status;
581 ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
582 }
583
584 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
585 ib_cm_handler cm_handler,
586 void *context)
587 {
588 struct cm_id_private *cm_id_priv;
589 int ret;
590
591 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
592 if (!cm_id_priv)
593 return ERR_PTR(-ENOMEM);
594
595 cm_id_priv->id.state = IB_CM_IDLE;
596 cm_id_priv->id.device = device;
597 cm_id_priv->id.cm_handler = cm_handler;
598 cm_id_priv->id.context = context;
599 cm_id_priv->id.remote_cm_qpn = 1;
600 ret = cm_alloc_id(cm_id_priv);
601 if (ret)
602 goto error;
603
604 spin_lock_init(&cm_id_priv->lock);
605 init_completion(&cm_id_priv->comp);
606 INIT_LIST_HEAD(&cm_id_priv->work_list);
607 atomic_set(&cm_id_priv->work_count, -1);
608 atomic_set(&cm_id_priv->refcount, 1);
609 return &cm_id_priv->id;
610
611 error:
612 kfree(cm_id_priv);
613 return ERR_PTR(-ENOMEM);
614 }
615 EXPORT_SYMBOL(ib_create_cm_id);
616
617 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
618 {
619 struct cm_work *work;
620
621 if (list_empty(&cm_id_priv->work_list))
622 return NULL;
623
624 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
625 list_del(&work->list);
626 return work;
627 }
628
629 static void cm_free_work(struct cm_work *work)
630 {
631 if (work->mad_recv_wc)
632 ib_free_recv_mad(work->mad_recv_wc);
633 kfree(work);
634 }
635
636 static inline int cm_convert_to_ms(int iba_time)
637 {
638 /* approximate conversion to ms from 4.096us x 2^iba_time */
639 return 1 << max(iba_time - 8, 0);
640 }
641
642 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
643 {
644 unsigned long flags;
645
646 if (!timewait_info->inserted_remote_id &&
647 !timewait_info->inserted_remote_qp)
648 return;
649
650 spin_lock_irqsave(&cm.lock, flags);
651 if (timewait_info->inserted_remote_id) {
652 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
653 timewait_info->inserted_remote_id = 0;
654 }
655
656 if (timewait_info->inserted_remote_qp) {
657 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
658 timewait_info->inserted_remote_qp = 0;
659 }
660 spin_unlock_irqrestore(&cm.lock, flags);
661 }
662
663 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
664 {
665 struct cm_timewait_info *timewait_info;
666
667 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
668 if (!timewait_info)
669 return ERR_PTR(-ENOMEM);
670
671 timewait_info->work.local_id = local_id;
672 INIT_WORK(&timewait_info->work.work, cm_work_handler,
673 &timewait_info->work);
674 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
675 return timewait_info;
676 }
677
678 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
679 {
680 int wait_time;
681
682 /*
683 * The cm_id could be destroyed by the user before we exit timewait.
684 * To protect against this, we search for the cm_id after exiting
685 * timewait before notifying the user that we've exited timewait.
686 */
687 cm_id_priv->id.state = IB_CM_TIMEWAIT;
688 wait_time = cm_convert_to_ms(cm_id_priv->local_ack_timeout);
689 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
690 msecs_to_jiffies(wait_time));
691 cm_id_priv->timewait_info = NULL;
692 }
693
694 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
695 {
696 cm_id_priv->id.state = IB_CM_IDLE;
697 if (cm_id_priv->timewait_info) {
698 cm_cleanup_timewait(cm_id_priv->timewait_info);
699 kfree(cm_id_priv->timewait_info);
700 cm_id_priv->timewait_info = NULL;
701 }
702 }
703
704 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
705 {
706 struct cm_id_private *cm_id_priv;
707 struct cm_work *work;
708 unsigned long flags;
709
710 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
711 retest:
712 spin_lock_irqsave(&cm_id_priv->lock, flags);
713 switch (cm_id->state) {
714 case IB_CM_LISTEN:
715 cm_id->state = IB_CM_IDLE;
716 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
717 spin_lock_irqsave(&cm.lock, flags);
718 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
719 spin_unlock_irqrestore(&cm.lock, flags);
720 break;
721 case IB_CM_SIDR_REQ_SENT:
722 cm_id->state = IB_CM_IDLE;
723 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
724 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
725 break;
726 case IB_CM_SIDR_REQ_RCVD:
727 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
728 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
729 break;
730 case IB_CM_REQ_SENT:
731 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
732 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
733 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
734 &cm_id_priv->av.port->cm_dev->ca_guid,
735 sizeof cm_id_priv->av.port->cm_dev->ca_guid,
736 NULL, 0);
737 break;
738 case IB_CM_REQ_RCVD:
739 if (err == -ENOMEM) {
740 /* Do not reject to allow future retries. */
741 cm_reset_to_idle(cm_id_priv);
742 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
743 } else {
744 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
745 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
746 NULL, 0, NULL, 0);
747 }
748 break;
749 case IB_CM_MRA_REQ_RCVD:
750 case IB_CM_REP_SENT:
751 case IB_CM_MRA_REP_RCVD:
752 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
753 /* Fall through */
754 case IB_CM_MRA_REQ_SENT:
755 case IB_CM_REP_RCVD:
756 case IB_CM_MRA_REP_SENT:
757 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
758 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
759 NULL, 0, NULL, 0);
760 break;
761 case IB_CM_ESTABLISHED:
762 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
763 ib_send_cm_dreq(cm_id, NULL, 0);
764 goto retest;
765 case IB_CM_DREQ_SENT:
766 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
767 cm_enter_timewait(cm_id_priv);
768 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
769 break;
770 case IB_CM_DREQ_RCVD:
771 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
772 ib_send_cm_drep(cm_id, NULL, 0);
773 break;
774 default:
775 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
776 break;
777 }
778
779 cm_free_id(cm_id->local_id);
780 cm_deref_id(cm_id_priv);
781 wait_for_completion(&cm_id_priv->comp);
782 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
783 cm_free_work(work);
784 kfree(cm_id_priv->compare_data);
785 kfree(cm_id_priv->private_data);
786 kfree(cm_id_priv);
787 }
788
789 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
790 {
791 cm_destroy_id(cm_id, 0);
792 }
793 EXPORT_SYMBOL(ib_destroy_cm_id);
794
795 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
796 struct ib_cm_compare_data *compare_data)
797 {
798 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
799 unsigned long flags;
800 int ret = 0;
801
802 service_mask = service_mask ? service_mask :
803 __constant_cpu_to_be64(~0ULL);
804 service_id &= service_mask;
805 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
806 (service_id != IB_CM_ASSIGN_SERVICE_ID))
807 return -EINVAL;
808
809 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
810 if (cm_id->state != IB_CM_IDLE)
811 return -EINVAL;
812
813 if (compare_data) {
814 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
815 GFP_KERNEL);
816 if (!cm_id_priv->compare_data)
817 return -ENOMEM;
818 cm_mask_copy(cm_id_priv->compare_data->data,
819 compare_data->data, compare_data->mask);
820 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
821 IB_CM_COMPARE_SIZE);
822 }
823
824 cm_id->state = IB_CM_LISTEN;
825
826 spin_lock_irqsave(&cm.lock, flags);
827 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
828 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
829 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
830 } else {
831 cm_id->service_id = service_id;
832 cm_id->service_mask = service_mask;
833 }
834 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
835 spin_unlock_irqrestore(&cm.lock, flags);
836
837 if (cur_cm_id_priv) {
838 cm_id->state = IB_CM_IDLE;
839 kfree(cm_id_priv->compare_data);
840 cm_id_priv->compare_data = NULL;
841 ret = -EBUSY;
842 }
843 return ret;
844 }
845 EXPORT_SYMBOL(ib_cm_listen);
846
847 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
848 enum cm_msg_sequence msg_seq)
849 {
850 u64 hi_tid, low_tid;
851
852 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
853 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
854 (msg_seq << 30));
855 return cpu_to_be64(hi_tid | low_tid);
856 }
857
858 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
859 __be16 attr_id, __be64 tid)
860 {
861 hdr->base_version = IB_MGMT_BASE_VERSION;
862 hdr->mgmt_class = IB_MGMT_CLASS_CM;
863 hdr->class_version = IB_CM_CLASS_VERSION;
864 hdr->method = IB_MGMT_METHOD_SEND;
865 hdr->attr_id = attr_id;
866 hdr->tid = tid;
867 }
868
869 static void cm_format_req(struct cm_req_msg *req_msg,
870 struct cm_id_private *cm_id_priv,
871 struct ib_cm_req_param *param)
872 {
873 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
874 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
875
876 req_msg->local_comm_id = cm_id_priv->id.local_id;
877 req_msg->service_id = param->service_id;
878 req_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
879 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
880 cm_req_set_resp_res(req_msg, param->responder_resources);
881 cm_req_set_init_depth(req_msg, param->initiator_depth);
882 cm_req_set_remote_resp_timeout(req_msg,
883 param->remote_cm_response_timeout);
884 cm_req_set_qp_type(req_msg, param->qp_type);
885 cm_req_set_flow_ctrl(req_msg, param->flow_control);
886 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
887 cm_req_set_local_resp_timeout(req_msg,
888 param->local_cm_response_timeout);
889 cm_req_set_retry_count(req_msg, param->retry_count);
890 req_msg->pkey = param->primary_path->pkey;
891 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
892 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
893 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
894 cm_req_set_srq(req_msg, param->srq);
895
896 req_msg->primary_local_lid = param->primary_path->slid;
897 req_msg->primary_remote_lid = param->primary_path->dlid;
898 req_msg->primary_local_gid = param->primary_path->sgid;
899 req_msg->primary_remote_gid = param->primary_path->dgid;
900 cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label);
901 cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate);
902 req_msg->primary_traffic_class = param->primary_path->traffic_class;
903 req_msg->primary_hop_limit = param->primary_path->hop_limit;
904 cm_req_set_primary_sl(req_msg, param->primary_path->sl);
905 cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */
906 cm_req_set_primary_local_ack_timeout(req_msg,
907 min(31, param->primary_path->packet_life_time + 1));
908
909 if (param->alternate_path) {
910 req_msg->alt_local_lid = param->alternate_path->slid;
911 req_msg->alt_remote_lid = param->alternate_path->dlid;
912 req_msg->alt_local_gid = param->alternate_path->sgid;
913 req_msg->alt_remote_gid = param->alternate_path->dgid;
914 cm_req_set_alt_flow_label(req_msg,
915 param->alternate_path->flow_label);
916 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate);
917 req_msg->alt_traffic_class = param->alternate_path->traffic_class;
918 req_msg->alt_hop_limit = param->alternate_path->hop_limit;
919 cm_req_set_alt_sl(req_msg, param->alternate_path->sl);
920 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */
921 cm_req_set_alt_local_ack_timeout(req_msg,
922 min(31, param->alternate_path->packet_life_time + 1));
923 }
924
925 if (param->private_data && param->private_data_len)
926 memcpy(req_msg->private_data, param->private_data,
927 param->private_data_len);
928 }
929
930 static int cm_validate_req_param(struct ib_cm_req_param *param)
931 {
932 /* peer-to-peer not supported */
933 if (param->peer_to_peer)
934 return -EINVAL;
935
936 if (!param->primary_path)
937 return -EINVAL;
938
939 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
940 return -EINVAL;
941
942 if (param->private_data &&
943 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
944 return -EINVAL;
945
946 if (param->alternate_path &&
947 (param->alternate_path->pkey != param->primary_path->pkey ||
948 param->alternate_path->mtu != param->primary_path->mtu))
949 return -EINVAL;
950
951 return 0;
952 }
953
954 int ib_send_cm_req(struct ib_cm_id *cm_id,
955 struct ib_cm_req_param *param)
956 {
957 struct cm_id_private *cm_id_priv;
958 struct cm_req_msg *req_msg;
959 unsigned long flags;
960 int ret;
961
962 ret = cm_validate_req_param(param);
963 if (ret)
964 return ret;
965
966 /* Verify that we're not in timewait. */
967 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
968 spin_lock_irqsave(&cm_id_priv->lock, flags);
969 if (cm_id->state != IB_CM_IDLE) {
970 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
971 ret = -EINVAL;
972 goto out;
973 }
974 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
975
976 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
977 id.local_id);
978 if (IS_ERR(cm_id_priv->timewait_info))
979 goto out;
980
981 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
982 if (ret)
983 goto error1;
984 if (param->alternate_path) {
985 ret = cm_init_av_by_path(param->alternate_path,
986 &cm_id_priv->alt_av);
987 if (ret)
988 goto error1;
989 }
990 cm_id->service_id = param->service_id;
991 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
992 cm_id_priv->timeout_ms = cm_convert_to_ms(
993 param->primary_path->packet_life_time) * 2 +
994 cm_convert_to_ms(
995 param->remote_cm_response_timeout);
996 cm_id_priv->max_cm_retries = param->max_cm_retries;
997 cm_id_priv->initiator_depth = param->initiator_depth;
998 cm_id_priv->responder_resources = param->responder_resources;
999 cm_id_priv->retry_count = param->retry_count;
1000 cm_id_priv->path_mtu = param->primary_path->mtu;
1001 cm_id_priv->qp_type = param->qp_type;
1002
1003 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1004 if (ret)
1005 goto error1;
1006
1007 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1008 cm_format_req(req_msg, cm_id_priv, param);
1009 cm_id_priv->tid = req_msg->hdr.tid;
1010 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1011 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1012
1013 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1014 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1015 cm_id_priv->local_ack_timeout =
1016 cm_req_get_primary_local_ack_timeout(req_msg);
1017
1018 spin_lock_irqsave(&cm_id_priv->lock, flags);
1019 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1020 if (ret) {
1021 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1022 goto error2;
1023 }
1024 BUG_ON(cm_id->state != IB_CM_IDLE);
1025 cm_id->state = IB_CM_REQ_SENT;
1026 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1027 return 0;
1028
1029 error2: cm_free_msg(cm_id_priv->msg);
1030 error1: kfree(cm_id_priv->timewait_info);
1031 out: return ret;
1032 }
1033 EXPORT_SYMBOL(ib_send_cm_req);
1034
1035 static int cm_issue_rej(struct cm_port *port,
1036 struct ib_mad_recv_wc *mad_recv_wc,
1037 enum ib_cm_rej_reason reason,
1038 enum cm_msg_response msg_rejected,
1039 void *ari, u8 ari_length)
1040 {
1041 struct ib_mad_send_buf *msg = NULL;
1042 struct cm_rej_msg *rej_msg, *rcv_msg;
1043 int ret;
1044
1045 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1046 if (ret)
1047 return ret;
1048
1049 /* We just need common CM header information. Cast to any message. */
1050 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1051 rej_msg = (struct cm_rej_msg *) msg->mad;
1052
1053 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1054 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1055 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1056 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1057 rej_msg->reason = cpu_to_be16(reason);
1058
1059 if (ari && ari_length) {
1060 cm_rej_set_reject_info_len(rej_msg, ari_length);
1061 memcpy(rej_msg->ari, ari, ari_length);
1062 }
1063
1064 ret = ib_post_send_mad(msg, NULL);
1065 if (ret)
1066 cm_free_msg(msg);
1067
1068 return ret;
1069 }
1070
1071 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1072 __be32 local_qpn, __be32 remote_qpn)
1073 {
1074 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1075 ((local_ca_guid == remote_ca_guid) &&
1076 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1077 }
1078
1079 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1080 struct ib_sa_path_rec *primary_path,
1081 struct ib_sa_path_rec *alt_path)
1082 {
1083 memset(primary_path, 0, sizeof *primary_path);
1084 primary_path->dgid = req_msg->primary_local_gid;
1085 primary_path->sgid = req_msg->primary_remote_gid;
1086 primary_path->dlid = req_msg->primary_local_lid;
1087 primary_path->slid = req_msg->primary_remote_lid;
1088 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1089 primary_path->hop_limit = req_msg->primary_hop_limit;
1090 primary_path->traffic_class = req_msg->primary_traffic_class;
1091 primary_path->reversible = 1;
1092 primary_path->pkey = req_msg->pkey;
1093 primary_path->sl = cm_req_get_primary_sl(req_msg);
1094 primary_path->mtu_selector = IB_SA_EQ;
1095 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1096 primary_path->rate_selector = IB_SA_EQ;
1097 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1098 primary_path->packet_life_time_selector = IB_SA_EQ;
1099 primary_path->packet_life_time =
1100 cm_req_get_primary_local_ack_timeout(req_msg);
1101 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1102
1103 if (req_msg->alt_local_lid) {
1104 memset(alt_path, 0, sizeof *alt_path);
1105 alt_path->dgid = req_msg->alt_local_gid;
1106 alt_path->sgid = req_msg->alt_remote_gid;
1107 alt_path->dlid = req_msg->alt_local_lid;
1108 alt_path->slid = req_msg->alt_remote_lid;
1109 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1110 alt_path->hop_limit = req_msg->alt_hop_limit;
1111 alt_path->traffic_class = req_msg->alt_traffic_class;
1112 alt_path->reversible = 1;
1113 alt_path->pkey = req_msg->pkey;
1114 alt_path->sl = cm_req_get_alt_sl(req_msg);
1115 alt_path->mtu_selector = IB_SA_EQ;
1116 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1117 alt_path->rate_selector = IB_SA_EQ;
1118 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1119 alt_path->packet_life_time_selector = IB_SA_EQ;
1120 alt_path->packet_life_time =
1121 cm_req_get_alt_local_ack_timeout(req_msg);
1122 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1123 }
1124 }
1125
1126 static void cm_format_req_event(struct cm_work *work,
1127 struct cm_id_private *cm_id_priv,
1128 struct ib_cm_id *listen_id)
1129 {
1130 struct cm_req_msg *req_msg;
1131 struct ib_cm_req_event_param *param;
1132
1133 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1134 param = &work->cm_event.param.req_rcvd;
1135 param->listen_id = listen_id;
1136 param->port = cm_id_priv->av.port->port_num;
1137 param->primary_path = &work->path[0];
1138 if (req_msg->alt_local_lid)
1139 param->alternate_path = &work->path[1];
1140 else
1141 param->alternate_path = NULL;
1142 param->remote_ca_guid = req_msg->local_ca_guid;
1143 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1144 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1145 param->qp_type = cm_req_get_qp_type(req_msg);
1146 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1147 param->responder_resources = cm_req_get_init_depth(req_msg);
1148 param->initiator_depth = cm_req_get_resp_res(req_msg);
1149 param->local_cm_response_timeout =
1150 cm_req_get_remote_resp_timeout(req_msg);
1151 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1152 param->remote_cm_response_timeout =
1153 cm_req_get_local_resp_timeout(req_msg);
1154 param->retry_count = cm_req_get_retry_count(req_msg);
1155 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1156 param->srq = cm_req_get_srq(req_msg);
1157 work->cm_event.private_data = &req_msg->private_data;
1158 }
1159
1160 static void cm_process_work(struct cm_id_private *cm_id_priv,
1161 struct cm_work *work)
1162 {
1163 unsigned long flags;
1164 int ret;
1165
1166 /* We will typically only have the current event to report. */
1167 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1168 cm_free_work(work);
1169
1170 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1171 spin_lock_irqsave(&cm_id_priv->lock, flags);
1172 work = cm_dequeue_work(cm_id_priv);
1173 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1174 BUG_ON(!work);
1175 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1176 &work->cm_event);
1177 cm_free_work(work);
1178 }
1179 cm_deref_id(cm_id_priv);
1180 if (ret)
1181 cm_destroy_id(&cm_id_priv->id, ret);
1182 }
1183
1184 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1185 struct cm_id_private *cm_id_priv,
1186 enum cm_msg_response msg_mraed, u8 service_timeout,
1187 const void *private_data, u8 private_data_len)
1188 {
1189 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1190 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1191 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1192 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1193 cm_mra_set_service_timeout(mra_msg, service_timeout);
1194
1195 if (private_data && private_data_len)
1196 memcpy(mra_msg->private_data, private_data, private_data_len);
1197 }
1198
1199 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1200 struct cm_id_private *cm_id_priv,
1201 enum ib_cm_rej_reason reason,
1202 void *ari,
1203 u8 ari_length,
1204 const void *private_data,
1205 u8 private_data_len)
1206 {
1207 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1208 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1209
1210 switch(cm_id_priv->id.state) {
1211 case IB_CM_REQ_RCVD:
1212 rej_msg->local_comm_id = 0;
1213 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1214 break;
1215 case IB_CM_MRA_REQ_SENT:
1216 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1217 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1218 break;
1219 case IB_CM_REP_RCVD:
1220 case IB_CM_MRA_REP_SENT:
1221 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1222 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1223 break;
1224 default:
1225 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1226 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1227 break;
1228 }
1229
1230 rej_msg->reason = cpu_to_be16(reason);
1231 if (ari && ari_length) {
1232 cm_rej_set_reject_info_len(rej_msg, ari_length);
1233 memcpy(rej_msg->ari, ari, ari_length);
1234 }
1235
1236 if (private_data && private_data_len)
1237 memcpy(rej_msg->private_data, private_data, private_data_len);
1238 }
1239
1240 static void cm_dup_req_handler(struct cm_work *work,
1241 struct cm_id_private *cm_id_priv)
1242 {
1243 struct ib_mad_send_buf *msg = NULL;
1244 unsigned long flags;
1245 int ret;
1246
1247 /* Quick state check to discard duplicate REQs. */
1248 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1249 return;
1250
1251 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1252 if (ret)
1253 return;
1254
1255 spin_lock_irqsave(&cm_id_priv->lock, flags);
1256 switch (cm_id_priv->id.state) {
1257 case IB_CM_MRA_REQ_SENT:
1258 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1259 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1260 cm_id_priv->private_data,
1261 cm_id_priv->private_data_len);
1262 break;
1263 case IB_CM_TIMEWAIT:
1264 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1265 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1266 break;
1267 default:
1268 goto unlock;
1269 }
1270 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1271
1272 ret = ib_post_send_mad(msg, NULL);
1273 if (ret)
1274 goto free;
1275 return;
1276
1277 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1278 free: cm_free_msg(msg);
1279 }
1280
1281 static struct cm_id_private * cm_match_req(struct cm_work *work,
1282 struct cm_id_private *cm_id_priv)
1283 {
1284 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1285 struct cm_timewait_info *timewait_info;
1286 struct cm_req_msg *req_msg;
1287 unsigned long flags;
1288
1289 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1290
1291 /* Check for duplicate REQ and stale connections. */
1292 spin_lock_irqsave(&cm.lock, flags);
1293 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1294 if (!timewait_info)
1295 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1296
1297 if (timewait_info) {
1298 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1299 timewait_info->work.remote_id);
1300 spin_unlock_irqrestore(&cm.lock, flags);
1301 if (cur_cm_id_priv) {
1302 cm_dup_req_handler(work, cur_cm_id_priv);
1303 cm_deref_id(cur_cm_id_priv);
1304 } else
1305 cm_issue_rej(work->port, work->mad_recv_wc,
1306 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1307 NULL, 0);
1308 goto error;
1309 }
1310
1311 /* Find matching listen request. */
1312 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1313 req_msg->service_id,
1314 req_msg->private_data);
1315 if (!listen_cm_id_priv) {
1316 spin_unlock_irqrestore(&cm.lock, flags);
1317 cm_issue_rej(work->port, work->mad_recv_wc,
1318 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1319 NULL, 0);
1320 goto error;
1321 }
1322 atomic_inc(&listen_cm_id_priv->refcount);
1323 atomic_inc(&cm_id_priv->refcount);
1324 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1325 atomic_inc(&cm_id_priv->work_count);
1326 spin_unlock_irqrestore(&cm.lock, flags);
1327 return listen_cm_id_priv;
1328
1329 error: cm_cleanup_timewait(cm_id_priv->timewait_info);
1330 return NULL;
1331 }
1332
1333 static int cm_req_handler(struct cm_work *work)
1334 {
1335 struct ib_cm_id *cm_id;
1336 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1337 struct cm_req_msg *req_msg;
1338 int ret;
1339
1340 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1341
1342 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
1343 if (IS_ERR(cm_id))
1344 return PTR_ERR(cm_id);
1345
1346 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1347 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1348 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1349 work->mad_recv_wc->recv_buf.grh,
1350 &cm_id_priv->av);
1351 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1352 id.local_id);
1353 if (IS_ERR(cm_id_priv->timewait_info)) {
1354 ret = PTR_ERR(cm_id_priv->timewait_info);
1355 goto error1;
1356 }
1357 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1358 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1359 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1360
1361 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1362 if (!listen_cm_id_priv) {
1363 ret = -EINVAL;
1364 goto error2;
1365 }
1366
1367 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1368 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1369 cm_id_priv->id.service_id = req_msg->service_id;
1370 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
1371
1372 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1373 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1374 if (ret)
1375 goto error3;
1376 if (req_msg->alt_local_lid) {
1377 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1378 if (ret)
1379 goto error3;
1380 }
1381 cm_id_priv->tid = req_msg->hdr.tid;
1382 cm_id_priv->timeout_ms = cm_convert_to_ms(
1383 cm_req_get_local_resp_timeout(req_msg));
1384 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1385 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1386 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1387 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1388 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1389 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1390 cm_id_priv->local_ack_timeout =
1391 cm_req_get_primary_local_ack_timeout(req_msg);
1392 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1393 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1394 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1395
1396 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1397 cm_process_work(cm_id_priv, work);
1398 cm_deref_id(listen_cm_id_priv);
1399 return 0;
1400
1401 error3: atomic_dec(&cm_id_priv->refcount);
1402 cm_deref_id(listen_cm_id_priv);
1403 cm_cleanup_timewait(cm_id_priv->timewait_info);
1404 error2: kfree(cm_id_priv->timewait_info);
1405 cm_id_priv->timewait_info = NULL;
1406 error1: ib_destroy_cm_id(&cm_id_priv->id);
1407 return ret;
1408 }
1409
1410 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1411 struct cm_id_private *cm_id_priv,
1412 struct ib_cm_rep_param *param)
1413 {
1414 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1415 rep_msg->local_comm_id = cm_id_priv->id.local_id;
1416 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1417 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1418 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1419 rep_msg->resp_resources = param->responder_resources;
1420 rep_msg->initiator_depth = param->initiator_depth;
1421 cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay);
1422 cm_rep_set_failover(rep_msg, param->failover_accepted);
1423 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1424 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1425 cm_rep_set_srq(rep_msg, param->srq);
1426 rep_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
1427
1428 if (param->private_data && param->private_data_len)
1429 memcpy(rep_msg->private_data, param->private_data,
1430 param->private_data_len);
1431 }
1432
1433 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1434 struct ib_cm_rep_param *param)
1435 {
1436 struct cm_id_private *cm_id_priv;
1437 struct ib_mad_send_buf *msg;
1438 struct cm_rep_msg *rep_msg;
1439 unsigned long flags;
1440 int ret;
1441
1442 if (param->private_data &&
1443 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1444 return -EINVAL;
1445
1446 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1447 spin_lock_irqsave(&cm_id_priv->lock, flags);
1448 if (cm_id->state != IB_CM_REQ_RCVD &&
1449 cm_id->state != IB_CM_MRA_REQ_SENT) {
1450 ret = -EINVAL;
1451 goto out;
1452 }
1453
1454 ret = cm_alloc_msg(cm_id_priv, &msg);
1455 if (ret)
1456 goto out;
1457
1458 rep_msg = (struct cm_rep_msg *) msg->mad;
1459 cm_format_rep(rep_msg, cm_id_priv, param);
1460 msg->timeout_ms = cm_id_priv->timeout_ms;
1461 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1462
1463 ret = ib_post_send_mad(msg, NULL);
1464 if (ret) {
1465 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1466 cm_free_msg(msg);
1467 return ret;
1468 }
1469
1470 cm_id->state = IB_CM_REP_SENT;
1471 cm_id_priv->msg = msg;
1472 cm_id_priv->initiator_depth = param->initiator_depth;
1473 cm_id_priv->responder_resources = param->responder_resources;
1474 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1475 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1476
1477 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1478 return ret;
1479 }
1480 EXPORT_SYMBOL(ib_send_cm_rep);
1481
1482 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1483 struct cm_id_private *cm_id_priv,
1484 const void *private_data,
1485 u8 private_data_len)
1486 {
1487 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1488 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1489 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1490
1491 if (private_data && private_data_len)
1492 memcpy(rtu_msg->private_data, private_data, private_data_len);
1493 }
1494
1495 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1496 const void *private_data,
1497 u8 private_data_len)
1498 {
1499 struct cm_id_private *cm_id_priv;
1500 struct ib_mad_send_buf *msg;
1501 unsigned long flags;
1502 void *data;
1503 int ret;
1504
1505 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1506 return -EINVAL;
1507
1508 data = cm_copy_private_data(private_data, private_data_len);
1509 if (IS_ERR(data))
1510 return PTR_ERR(data);
1511
1512 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1513 spin_lock_irqsave(&cm_id_priv->lock, flags);
1514 if (cm_id->state != IB_CM_REP_RCVD &&
1515 cm_id->state != IB_CM_MRA_REP_SENT) {
1516 ret = -EINVAL;
1517 goto error;
1518 }
1519
1520 ret = cm_alloc_msg(cm_id_priv, &msg);
1521 if (ret)
1522 goto error;
1523
1524 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1525 private_data, private_data_len);
1526
1527 ret = ib_post_send_mad(msg, NULL);
1528 if (ret) {
1529 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1530 cm_free_msg(msg);
1531 kfree(data);
1532 return ret;
1533 }
1534
1535 cm_id->state = IB_CM_ESTABLISHED;
1536 cm_set_private_data(cm_id_priv, data, private_data_len);
1537 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1538 return 0;
1539
1540 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1541 kfree(data);
1542 return ret;
1543 }
1544 EXPORT_SYMBOL(ib_send_cm_rtu);
1545
1546 static void cm_format_rep_event(struct cm_work *work)
1547 {
1548 struct cm_rep_msg *rep_msg;
1549 struct ib_cm_rep_event_param *param;
1550
1551 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1552 param = &work->cm_event.param.rep_rcvd;
1553 param->remote_ca_guid = rep_msg->local_ca_guid;
1554 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1555 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1556 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1557 param->responder_resources = rep_msg->initiator_depth;
1558 param->initiator_depth = rep_msg->resp_resources;
1559 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1560 param->failover_accepted = cm_rep_get_failover(rep_msg);
1561 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1562 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1563 param->srq = cm_rep_get_srq(rep_msg);
1564 work->cm_event.private_data = &rep_msg->private_data;
1565 }
1566
1567 static void cm_dup_rep_handler(struct cm_work *work)
1568 {
1569 struct cm_id_private *cm_id_priv;
1570 struct cm_rep_msg *rep_msg;
1571 struct ib_mad_send_buf *msg = NULL;
1572 unsigned long flags;
1573 int ret;
1574
1575 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1576 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1577 rep_msg->local_comm_id);
1578 if (!cm_id_priv)
1579 return;
1580
1581 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1582 if (ret)
1583 goto deref;
1584
1585 spin_lock_irqsave(&cm_id_priv->lock, flags);
1586 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1587 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1588 cm_id_priv->private_data,
1589 cm_id_priv->private_data_len);
1590 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1591 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1592 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1593 cm_id_priv->private_data,
1594 cm_id_priv->private_data_len);
1595 else
1596 goto unlock;
1597 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1598
1599 ret = ib_post_send_mad(msg, NULL);
1600 if (ret)
1601 goto free;
1602 goto deref;
1603
1604 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1605 free: cm_free_msg(msg);
1606 deref: cm_deref_id(cm_id_priv);
1607 }
1608
1609 static int cm_rep_handler(struct cm_work *work)
1610 {
1611 struct cm_id_private *cm_id_priv;
1612 struct cm_rep_msg *rep_msg;
1613 unsigned long flags;
1614 int ret;
1615
1616 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1617 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1618 if (!cm_id_priv) {
1619 cm_dup_rep_handler(work);
1620 return -EINVAL;
1621 }
1622
1623 cm_format_rep_event(work);
1624
1625 spin_lock_irqsave(&cm_id_priv->lock, flags);
1626 switch (cm_id_priv->id.state) {
1627 case IB_CM_REQ_SENT:
1628 case IB_CM_MRA_REQ_RCVD:
1629 break;
1630 default:
1631 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1632 ret = -EINVAL;
1633 goto error;
1634 }
1635
1636 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1637 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1638 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1639
1640 spin_lock(&cm.lock);
1641 /* Check for duplicate REP. */
1642 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1643 spin_unlock(&cm.lock);
1644 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1645 ret = -EINVAL;
1646 goto error;
1647 }
1648 /* Check for a stale connection. */
1649 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1650 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1651 &cm.remote_id_table);
1652 cm_id_priv->timewait_info->inserted_remote_id = 0;
1653 spin_unlock(&cm.lock);
1654 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1655 cm_issue_rej(work->port, work->mad_recv_wc,
1656 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1657 NULL, 0);
1658 ret = -EINVAL;
1659 goto error;
1660 }
1661 spin_unlock(&cm.lock);
1662
1663 cm_id_priv->id.state = IB_CM_REP_RCVD;
1664 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1665 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1666 cm_id_priv->initiator_depth = rep_msg->resp_resources;
1667 cm_id_priv->responder_resources = rep_msg->initiator_depth;
1668 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1669 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1670
1671 /* todo: handle peer_to_peer */
1672
1673 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1674 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1675 if (!ret)
1676 list_add_tail(&work->list, &cm_id_priv->work_list);
1677 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1678
1679 if (ret)
1680 cm_process_work(cm_id_priv, work);
1681 else
1682 cm_deref_id(cm_id_priv);
1683 return 0;
1684
1685 error:
1686 cm_deref_id(cm_id_priv);
1687 return ret;
1688 }
1689
1690 static int cm_establish_handler(struct cm_work *work)
1691 {
1692 struct cm_id_private *cm_id_priv;
1693 unsigned long flags;
1694 int ret;
1695
1696 /* See comment in ib_cm_establish about lookup. */
1697 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1698 if (!cm_id_priv)
1699 return -EINVAL;
1700
1701 spin_lock_irqsave(&cm_id_priv->lock, flags);
1702 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1703 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1704 goto out;
1705 }
1706
1707 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1708 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1709 if (!ret)
1710 list_add_tail(&work->list, &cm_id_priv->work_list);
1711 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1712
1713 if (ret)
1714 cm_process_work(cm_id_priv, work);
1715 else
1716 cm_deref_id(cm_id_priv);
1717 return 0;
1718 out:
1719 cm_deref_id(cm_id_priv);
1720 return -EINVAL;
1721 }
1722
1723 static int cm_rtu_handler(struct cm_work *work)
1724 {
1725 struct cm_id_private *cm_id_priv;
1726 struct cm_rtu_msg *rtu_msg;
1727 unsigned long flags;
1728 int ret;
1729
1730 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1731 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1732 rtu_msg->local_comm_id);
1733 if (!cm_id_priv)
1734 return -EINVAL;
1735
1736 work->cm_event.private_data = &rtu_msg->private_data;
1737
1738 spin_lock_irqsave(&cm_id_priv->lock, flags);
1739 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1740 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1741 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1742 goto out;
1743 }
1744 cm_id_priv->id.state = IB_CM_ESTABLISHED;
1745
1746 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1747 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1748 if (!ret)
1749 list_add_tail(&work->list, &cm_id_priv->work_list);
1750 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1751
1752 if (ret)
1753 cm_process_work(cm_id_priv, work);
1754 else
1755 cm_deref_id(cm_id_priv);
1756 return 0;
1757 out:
1758 cm_deref_id(cm_id_priv);
1759 return -EINVAL;
1760 }
1761
1762 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1763 struct cm_id_private *cm_id_priv,
1764 const void *private_data,
1765 u8 private_data_len)
1766 {
1767 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1768 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1769 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1770 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1771 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1772
1773 if (private_data && private_data_len)
1774 memcpy(dreq_msg->private_data, private_data, private_data_len);
1775 }
1776
1777 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1778 const void *private_data,
1779 u8 private_data_len)
1780 {
1781 struct cm_id_private *cm_id_priv;
1782 struct ib_mad_send_buf *msg;
1783 unsigned long flags;
1784 int ret;
1785
1786 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1787 return -EINVAL;
1788
1789 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1790 spin_lock_irqsave(&cm_id_priv->lock, flags);
1791 if (cm_id->state != IB_CM_ESTABLISHED) {
1792 ret = -EINVAL;
1793 goto out;
1794 }
1795
1796 ret = cm_alloc_msg(cm_id_priv, &msg);
1797 if (ret) {
1798 cm_enter_timewait(cm_id_priv);
1799 goto out;
1800 }
1801
1802 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1803 private_data, private_data_len);
1804 msg->timeout_ms = cm_id_priv->timeout_ms;
1805 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
1806
1807 ret = ib_post_send_mad(msg, NULL);
1808 if (ret) {
1809 cm_enter_timewait(cm_id_priv);
1810 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1811 cm_free_msg(msg);
1812 return ret;
1813 }
1814
1815 cm_id->state = IB_CM_DREQ_SENT;
1816 cm_id_priv->msg = msg;
1817 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1818 return ret;
1819 }
1820 EXPORT_SYMBOL(ib_send_cm_dreq);
1821
1822 static void cm_format_drep(struct cm_drep_msg *drep_msg,
1823 struct cm_id_private *cm_id_priv,
1824 const void *private_data,
1825 u8 private_data_len)
1826 {
1827 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
1828 drep_msg->local_comm_id = cm_id_priv->id.local_id;
1829 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1830
1831 if (private_data && private_data_len)
1832 memcpy(drep_msg->private_data, private_data, private_data_len);
1833 }
1834
1835 int ib_send_cm_drep(struct ib_cm_id *cm_id,
1836 const void *private_data,
1837 u8 private_data_len)
1838 {
1839 struct cm_id_private *cm_id_priv;
1840 struct ib_mad_send_buf *msg;
1841 unsigned long flags;
1842 void *data;
1843 int ret;
1844
1845 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
1846 return -EINVAL;
1847
1848 data = cm_copy_private_data(private_data, private_data_len);
1849 if (IS_ERR(data))
1850 return PTR_ERR(data);
1851
1852 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1853 spin_lock_irqsave(&cm_id_priv->lock, flags);
1854 if (cm_id->state != IB_CM_DREQ_RCVD) {
1855 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1856 kfree(data);
1857 return -EINVAL;
1858 }
1859
1860 cm_set_private_data(cm_id_priv, data, private_data_len);
1861 cm_enter_timewait(cm_id_priv);
1862
1863 ret = cm_alloc_msg(cm_id_priv, &msg);
1864 if (ret)
1865 goto out;
1866
1867 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1868 private_data, private_data_len);
1869
1870 ret = ib_post_send_mad(msg, NULL);
1871 if (ret) {
1872 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1873 cm_free_msg(msg);
1874 return ret;
1875 }
1876
1877 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1878 return ret;
1879 }
1880 EXPORT_SYMBOL(ib_send_cm_drep);
1881
1882 static int cm_dreq_handler(struct cm_work *work)
1883 {
1884 struct cm_id_private *cm_id_priv;
1885 struct cm_dreq_msg *dreq_msg;
1886 struct ib_mad_send_buf *msg = NULL;
1887 unsigned long flags;
1888 int ret;
1889
1890 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
1891 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
1892 dreq_msg->local_comm_id);
1893 if (!cm_id_priv)
1894 return -EINVAL;
1895
1896 work->cm_event.private_data = &dreq_msg->private_data;
1897
1898 spin_lock_irqsave(&cm_id_priv->lock, flags);
1899 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
1900 goto unlock;
1901
1902 switch (cm_id_priv->id.state) {
1903 case IB_CM_REP_SENT:
1904 case IB_CM_DREQ_SENT:
1905 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1906 break;
1907 case IB_CM_ESTABLISHED:
1908 case IB_CM_MRA_REP_RCVD:
1909 break;
1910 case IB_CM_TIMEWAIT:
1911 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
1912 goto unlock;
1913
1914 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1915 cm_id_priv->private_data,
1916 cm_id_priv->private_data_len);
1917 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1918
1919 if (ib_post_send_mad(msg, NULL))
1920 cm_free_msg(msg);
1921 goto deref;
1922 default:
1923 goto unlock;
1924 }
1925 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
1926 cm_id_priv->tid = dreq_msg->hdr.tid;
1927 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1928 if (!ret)
1929 list_add_tail(&work->list, &cm_id_priv->work_list);
1930 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1931
1932 if (ret)
1933 cm_process_work(cm_id_priv, work);
1934 else
1935 cm_deref_id(cm_id_priv);
1936 return 0;
1937
1938 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1939 deref: cm_deref_id(cm_id_priv);
1940 return -EINVAL;
1941 }
1942
1943 static int cm_drep_handler(struct cm_work *work)
1944 {
1945 struct cm_id_private *cm_id_priv;
1946 struct cm_drep_msg *drep_msg;
1947 unsigned long flags;
1948 int ret;
1949
1950 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
1951 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
1952 drep_msg->local_comm_id);
1953 if (!cm_id_priv)
1954 return -EINVAL;
1955
1956 work->cm_event.private_data = &drep_msg->private_data;
1957
1958 spin_lock_irqsave(&cm_id_priv->lock, flags);
1959 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
1960 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
1961 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1962 goto out;
1963 }
1964 cm_enter_timewait(cm_id_priv);
1965
1966 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1967 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1968 if (!ret)
1969 list_add_tail(&work->list, &cm_id_priv->work_list);
1970 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1971
1972 if (ret)
1973 cm_process_work(cm_id_priv, work);
1974 else
1975 cm_deref_id(cm_id_priv);
1976 return 0;
1977 out:
1978 cm_deref_id(cm_id_priv);
1979 return -EINVAL;
1980 }
1981
1982 int ib_send_cm_rej(struct ib_cm_id *cm_id,
1983 enum ib_cm_rej_reason reason,
1984 void *ari,
1985 u8 ari_length,
1986 const void *private_data,
1987 u8 private_data_len)
1988 {
1989 struct cm_id_private *cm_id_priv;
1990 struct ib_mad_send_buf *msg;
1991 unsigned long flags;
1992 int ret;
1993
1994 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
1995 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
1996 return -EINVAL;
1997
1998 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1999
2000 spin_lock_irqsave(&cm_id_priv->lock, flags);
2001 switch (cm_id->state) {
2002 case IB_CM_REQ_SENT:
2003 case IB_CM_MRA_REQ_RCVD:
2004 case IB_CM_REQ_RCVD:
2005 case IB_CM_MRA_REQ_SENT:
2006 case IB_CM_REP_RCVD:
2007 case IB_CM_MRA_REP_SENT:
2008 ret = cm_alloc_msg(cm_id_priv, &msg);
2009 if (!ret)
2010 cm_format_rej((struct cm_rej_msg *) msg->mad,
2011 cm_id_priv, reason, ari, ari_length,
2012 private_data, private_data_len);
2013
2014 cm_reset_to_idle(cm_id_priv);
2015 break;
2016 case IB_CM_REP_SENT:
2017 case IB_CM_MRA_REP_RCVD:
2018 ret = cm_alloc_msg(cm_id_priv, &msg);
2019 if (!ret)
2020 cm_format_rej((struct cm_rej_msg *) msg->mad,
2021 cm_id_priv, reason, ari, ari_length,
2022 private_data, private_data_len);
2023
2024 cm_enter_timewait(cm_id_priv);
2025 break;
2026 default:
2027 ret = -EINVAL;
2028 goto out;
2029 }
2030
2031 if (ret)
2032 goto out;
2033
2034 ret = ib_post_send_mad(msg, NULL);
2035 if (ret)
2036 cm_free_msg(msg);
2037
2038 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2039 return ret;
2040 }
2041 EXPORT_SYMBOL(ib_send_cm_rej);
2042
2043 static void cm_format_rej_event(struct cm_work *work)
2044 {
2045 struct cm_rej_msg *rej_msg;
2046 struct ib_cm_rej_event_param *param;
2047
2048 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2049 param = &work->cm_event.param.rej_rcvd;
2050 param->ari = rej_msg->ari;
2051 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2052 param->reason = __be16_to_cpu(rej_msg->reason);
2053 work->cm_event.private_data = &rej_msg->private_data;
2054 }
2055
2056 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2057 {
2058 struct cm_timewait_info *timewait_info;
2059 struct cm_id_private *cm_id_priv;
2060 unsigned long flags;
2061 __be32 remote_id;
2062
2063 remote_id = rej_msg->local_comm_id;
2064
2065 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2066 spin_lock_irqsave(&cm.lock, flags);
2067 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2068 remote_id);
2069 if (!timewait_info) {
2070 spin_unlock_irqrestore(&cm.lock, flags);
2071 return NULL;
2072 }
2073 cm_id_priv = idr_find(&cm.local_id_table,
2074 (__force int) timewait_info->work.local_id);
2075 if (cm_id_priv) {
2076 if (cm_id_priv->id.remote_id == remote_id)
2077 atomic_inc(&cm_id_priv->refcount);
2078 else
2079 cm_id_priv = NULL;
2080 }
2081 spin_unlock_irqrestore(&cm.lock, flags);
2082 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2083 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2084 else
2085 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2086
2087 return cm_id_priv;
2088 }
2089
2090 static int cm_rej_handler(struct cm_work *work)
2091 {
2092 struct cm_id_private *cm_id_priv;
2093 struct cm_rej_msg *rej_msg;
2094 unsigned long flags;
2095 int ret;
2096
2097 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2098 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2099 if (!cm_id_priv)
2100 return -EINVAL;
2101
2102 cm_format_rej_event(work);
2103
2104 spin_lock_irqsave(&cm_id_priv->lock, flags);
2105 switch (cm_id_priv->id.state) {
2106 case IB_CM_REQ_SENT:
2107 case IB_CM_MRA_REQ_RCVD:
2108 case IB_CM_REP_SENT:
2109 case IB_CM_MRA_REP_RCVD:
2110 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2111 /* fall through */
2112 case IB_CM_REQ_RCVD:
2113 case IB_CM_MRA_REQ_SENT:
2114 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2115 cm_enter_timewait(cm_id_priv);
2116 else
2117 cm_reset_to_idle(cm_id_priv);
2118 break;
2119 case IB_CM_DREQ_SENT:
2120 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2121 /* fall through */
2122 case IB_CM_REP_RCVD:
2123 case IB_CM_MRA_REP_SENT:
2124 case IB_CM_ESTABLISHED:
2125 cm_enter_timewait(cm_id_priv);
2126 break;
2127 default:
2128 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2129 ret = -EINVAL;
2130 goto out;
2131 }
2132
2133 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2134 if (!ret)
2135 list_add_tail(&work->list, &cm_id_priv->work_list);
2136 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2137
2138 if (ret)
2139 cm_process_work(cm_id_priv, work);
2140 else
2141 cm_deref_id(cm_id_priv);
2142 return 0;
2143 out:
2144 cm_deref_id(cm_id_priv);
2145 return -EINVAL;
2146 }
2147
2148 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2149 u8 service_timeout,
2150 const void *private_data,
2151 u8 private_data_len)
2152 {
2153 struct cm_id_private *cm_id_priv;
2154 struct ib_mad_send_buf *msg;
2155 void *data;
2156 unsigned long flags;
2157 int ret;
2158
2159 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2160 return -EINVAL;
2161
2162 data = cm_copy_private_data(private_data, private_data_len);
2163 if (IS_ERR(data))
2164 return PTR_ERR(data);
2165
2166 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2167
2168 spin_lock_irqsave(&cm_id_priv->lock, flags);
2169 switch(cm_id_priv->id.state) {
2170 case IB_CM_REQ_RCVD:
2171 ret = cm_alloc_msg(cm_id_priv, &msg);
2172 if (ret)
2173 goto error1;
2174
2175 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2176 CM_MSG_RESPONSE_REQ, service_timeout,
2177 private_data, private_data_len);
2178 ret = ib_post_send_mad(msg, NULL);
2179 if (ret)
2180 goto error2;
2181 cm_id->state = IB_CM_MRA_REQ_SENT;
2182 break;
2183 case IB_CM_REP_RCVD:
2184 ret = cm_alloc_msg(cm_id_priv, &msg);
2185 if (ret)
2186 goto error1;
2187
2188 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2189 CM_MSG_RESPONSE_REP, service_timeout,
2190 private_data, private_data_len);
2191 ret = ib_post_send_mad(msg, NULL);
2192 if (ret)
2193 goto error2;
2194 cm_id->state = IB_CM_MRA_REP_SENT;
2195 break;
2196 case IB_CM_ESTABLISHED:
2197 ret = cm_alloc_msg(cm_id_priv, &msg);
2198 if (ret)
2199 goto error1;
2200
2201 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2202 CM_MSG_RESPONSE_OTHER, service_timeout,
2203 private_data, private_data_len);
2204 ret = ib_post_send_mad(msg, NULL);
2205 if (ret)
2206 goto error2;
2207 cm_id->lap_state = IB_CM_MRA_LAP_SENT;
2208 break;
2209 default:
2210 ret = -EINVAL;
2211 goto error1;
2212 }
2213 cm_id_priv->service_timeout = service_timeout;
2214 cm_set_private_data(cm_id_priv, data, private_data_len);
2215 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2216 return 0;
2217
2218 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2219 kfree(data);
2220 return ret;
2221
2222 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2223 kfree(data);
2224 cm_free_msg(msg);
2225 return ret;
2226 }
2227 EXPORT_SYMBOL(ib_send_cm_mra);
2228
2229 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2230 {
2231 switch (cm_mra_get_msg_mraed(mra_msg)) {
2232 case CM_MSG_RESPONSE_REQ:
2233 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2234 case CM_MSG_RESPONSE_REP:
2235 case CM_MSG_RESPONSE_OTHER:
2236 return cm_acquire_id(mra_msg->remote_comm_id,
2237 mra_msg->local_comm_id);
2238 default:
2239 return NULL;
2240 }
2241 }
2242
2243 static int cm_mra_handler(struct cm_work *work)
2244 {
2245 struct cm_id_private *cm_id_priv;
2246 struct cm_mra_msg *mra_msg;
2247 unsigned long flags;
2248 int timeout, ret;
2249
2250 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2251 cm_id_priv = cm_acquire_mraed_id(mra_msg);
2252 if (!cm_id_priv)
2253 return -EINVAL;
2254
2255 work->cm_event.private_data = &mra_msg->private_data;
2256 work->cm_event.param.mra_rcvd.service_timeout =
2257 cm_mra_get_service_timeout(mra_msg);
2258 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2259 cm_convert_to_ms(cm_id_priv->av.packet_life_time);
2260
2261 spin_lock_irqsave(&cm_id_priv->lock, flags);
2262 switch (cm_id_priv->id.state) {
2263 case IB_CM_REQ_SENT:
2264 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2265 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2266 cm_id_priv->msg, timeout))
2267 goto out;
2268 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2269 break;
2270 case IB_CM_REP_SENT:
2271 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2272 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2273 cm_id_priv->msg, timeout))
2274 goto out;
2275 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2276 break;
2277 case IB_CM_ESTABLISHED:
2278 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2279 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2280 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2281 cm_id_priv->msg, timeout))
2282 goto out;
2283 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2284 break;
2285 default:
2286 goto out;
2287 }
2288
2289 cm_id_priv->msg->context[1] = (void *) (unsigned long)
2290 cm_id_priv->id.state;
2291 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2292 if (!ret)
2293 list_add_tail(&work->list, &cm_id_priv->work_list);
2294 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2295
2296 if (ret)
2297 cm_process_work(cm_id_priv, work);
2298 else
2299 cm_deref_id(cm_id_priv);
2300 return 0;
2301 out:
2302 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2303 cm_deref_id(cm_id_priv);
2304 return -EINVAL;
2305 }
2306
2307 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2308 struct cm_id_private *cm_id_priv,
2309 struct ib_sa_path_rec *alternate_path,
2310 const void *private_data,
2311 u8 private_data_len)
2312 {
2313 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2314 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2315 lap_msg->local_comm_id = cm_id_priv->id.local_id;
2316 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2317 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2318 /* todo: need remote CM response timeout */
2319 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2320 lap_msg->alt_local_lid = alternate_path->slid;
2321 lap_msg->alt_remote_lid = alternate_path->dlid;
2322 lap_msg->alt_local_gid = alternate_path->sgid;
2323 lap_msg->alt_remote_gid = alternate_path->dgid;
2324 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2325 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2326 lap_msg->alt_hop_limit = alternate_path->hop_limit;
2327 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2328 cm_lap_set_sl(lap_msg, alternate_path->sl);
2329 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2330 cm_lap_set_local_ack_timeout(lap_msg,
2331 min(31, alternate_path->packet_life_time + 1));
2332
2333 if (private_data && private_data_len)
2334 memcpy(lap_msg->private_data, private_data, private_data_len);
2335 }
2336
2337 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2338 struct ib_sa_path_rec *alternate_path,
2339 const void *private_data,
2340 u8 private_data_len)
2341 {
2342 struct cm_id_private *cm_id_priv;
2343 struct ib_mad_send_buf *msg;
2344 unsigned long flags;
2345 int ret;
2346
2347 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2348 return -EINVAL;
2349
2350 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2351 spin_lock_irqsave(&cm_id_priv->lock, flags);
2352 if (cm_id->state != IB_CM_ESTABLISHED ||
2353 cm_id->lap_state != IB_CM_LAP_IDLE) {
2354 ret = -EINVAL;
2355 goto out;
2356 }
2357
2358 ret = cm_alloc_msg(cm_id_priv, &msg);
2359 if (ret)
2360 goto out;
2361
2362 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2363 alternate_path, private_data, private_data_len);
2364 msg->timeout_ms = cm_id_priv->timeout_ms;
2365 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2366
2367 ret = ib_post_send_mad(msg, NULL);
2368 if (ret) {
2369 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2370 cm_free_msg(msg);
2371 return ret;
2372 }
2373
2374 cm_id->lap_state = IB_CM_LAP_SENT;
2375 cm_id_priv->msg = msg;
2376
2377 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2378 return ret;
2379 }
2380 EXPORT_SYMBOL(ib_send_cm_lap);
2381
2382 static void cm_format_path_from_lap(struct ib_sa_path_rec *path,
2383 struct cm_lap_msg *lap_msg)
2384 {
2385 memset(path, 0, sizeof *path);
2386 path->dgid = lap_msg->alt_local_gid;
2387 path->sgid = lap_msg->alt_remote_gid;
2388 path->dlid = lap_msg->alt_local_lid;
2389 path->slid = lap_msg->alt_remote_lid;
2390 path->flow_label = cm_lap_get_flow_label(lap_msg);
2391 path->hop_limit = lap_msg->alt_hop_limit;
2392 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2393 path->reversible = 1;
2394 /* pkey is same as in REQ */
2395 path->sl = cm_lap_get_sl(lap_msg);
2396 path->mtu_selector = IB_SA_EQ;
2397 /* mtu is same as in REQ */
2398 path->rate_selector = IB_SA_EQ;
2399 path->rate = cm_lap_get_packet_rate(lap_msg);
2400 path->packet_life_time_selector = IB_SA_EQ;
2401 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2402 path->packet_life_time -= (path->packet_life_time > 0);
2403 }
2404
2405 static int cm_lap_handler(struct cm_work *work)
2406 {
2407 struct cm_id_private *cm_id_priv;
2408 struct cm_lap_msg *lap_msg;
2409 struct ib_cm_lap_event_param *param;
2410 struct ib_mad_send_buf *msg = NULL;
2411 unsigned long flags;
2412 int ret;
2413
2414 /* todo: verify LAP request and send reject APR if invalid. */
2415 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2416 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2417 lap_msg->local_comm_id);
2418 if (!cm_id_priv)
2419 return -EINVAL;
2420
2421 param = &work->cm_event.param.lap_rcvd;
2422 param->alternate_path = &work->path[0];
2423 cm_format_path_from_lap(param->alternate_path, lap_msg);
2424 work->cm_event.private_data = &lap_msg->private_data;
2425
2426 spin_lock_irqsave(&cm_id_priv->lock, flags);
2427 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2428 goto unlock;
2429
2430 switch (cm_id_priv->id.lap_state) {
2431 case IB_CM_LAP_IDLE:
2432 break;
2433 case IB_CM_MRA_LAP_SENT:
2434 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2435 goto unlock;
2436
2437 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2438 CM_MSG_RESPONSE_OTHER,
2439 cm_id_priv->service_timeout,
2440 cm_id_priv->private_data,
2441 cm_id_priv->private_data_len);
2442 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2443
2444 if (ib_post_send_mad(msg, NULL))
2445 cm_free_msg(msg);
2446 goto deref;
2447 default:
2448 goto unlock;
2449 }
2450
2451 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2452 cm_id_priv->tid = lap_msg->hdr.tid;
2453 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2454 if (!ret)
2455 list_add_tail(&work->list, &cm_id_priv->work_list);
2456 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2457
2458 if (ret)
2459 cm_process_work(cm_id_priv, work);
2460 else
2461 cm_deref_id(cm_id_priv);
2462 return 0;
2463
2464 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2465 deref: cm_deref_id(cm_id_priv);
2466 return -EINVAL;
2467 }
2468
2469 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2470 struct cm_id_private *cm_id_priv,
2471 enum ib_cm_apr_status status,
2472 void *info,
2473 u8 info_length,
2474 const void *private_data,
2475 u8 private_data_len)
2476 {
2477 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2478 apr_msg->local_comm_id = cm_id_priv->id.local_id;
2479 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2480 apr_msg->ap_status = (u8) status;
2481
2482 if (info && info_length) {
2483 apr_msg->info_length = info_length;
2484 memcpy(apr_msg->info, info, info_length);
2485 }
2486
2487 if (private_data && private_data_len)
2488 memcpy(apr_msg->private_data, private_data, private_data_len);
2489 }
2490
2491 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2492 enum ib_cm_apr_status status,
2493 void *info,
2494 u8 info_length,
2495 const void *private_data,
2496 u8 private_data_len)
2497 {
2498 struct cm_id_private *cm_id_priv;
2499 struct ib_mad_send_buf *msg;
2500 unsigned long flags;
2501 int ret;
2502
2503 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2504 (info && info_length > IB_CM_APR_INFO_LENGTH))
2505 return -EINVAL;
2506
2507 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2508 spin_lock_irqsave(&cm_id_priv->lock, flags);
2509 if (cm_id->state != IB_CM_ESTABLISHED ||
2510 (cm_id->lap_state != IB_CM_LAP_RCVD &&
2511 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2512 ret = -EINVAL;
2513 goto out;
2514 }
2515
2516 ret = cm_alloc_msg(cm_id_priv, &msg);
2517 if (ret)
2518 goto out;
2519
2520 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2521 info, info_length, private_data, private_data_len);
2522 ret = ib_post_send_mad(msg, NULL);
2523 if (ret) {
2524 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2525 cm_free_msg(msg);
2526 return ret;
2527 }
2528
2529 cm_id->lap_state = IB_CM_LAP_IDLE;
2530 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2531 return ret;
2532 }
2533 EXPORT_SYMBOL(ib_send_cm_apr);
2534
2535 static int cm_apr_handler(struct cm_work *work)
2536 {
2537 struct cm_id_private *cm_id_priv;
2538 struct cm_apr_msg *apr_msg;
2539 unsigned long flags;
2540 int ret;
2541
2542 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2543 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2544 apr_msg->local_comm_id);
2545 if (!cm_id_priv)
2546 return -EINVAL; /* Unmatched reply. */
2547
2548 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2549 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2550 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2551 work->cm_event.private_data = &apr_msg->private_data;
2552
2553 spin_lock_irqsave(&cm_id_priv->lock, flags);
2554 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2555 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2556 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2557 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2558 goto out;
2559 }
2560 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2561 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2562 cm_id_priv->msg = NULL;
2563
2564 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2565 if (!ret)
2566 list_add_tail(&work->list, &cm_id_priv->work_list);
2567 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2568
2569 if (ret)
2570 cm_process_work(cm_id_priv, work);
2571 else
2572 cm_deref_id(cm_id_priv);
2573 return 0;
2574 out:
2575 cm_deref_id(cm_id_priv);
2576 return -EINVAL;
2577 }
2578
2579 static int cm_timewait_handler(struct cm_work *work)
2580 {
2581 struct cm_timewait_info *timewait_info;
2582 struct cm_id_private *cm_id_priv;
2583 unsigned long flags;
2584 int ret;
2585
2586 timewait_info = (struct cm_timewait_info *)work;
2587 cm_cleanup_timewait(timewait_info);
2588
2589 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2590 timewait_info->work.remote_id);
2591 if (!cm_id_priv)
2592 return -EINVAL;
2593
2594 spin_lock_irqsave(&cm_id_priv->lock, flags);
2595 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2596 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2597 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2598 goto out;
2599 }
2600 cm_id_priv->id.state = IB_CM_IDLE;
2601 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2602 if (!ret)
2603 list_add_tail(&work->list, &cm_id_priv->work_list);
2604 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2605
2606 if (ret)
2607 cm_process_work(cm_id_priv, work);
2608 else
2609 cm_deref_id(cm_id_priv);
2610 return 0;
2611 out:
2612 cm_deref_id(cm_id_priv);
2613 return -EINVAL;
2614 }
2615
2616 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2617 struct cm_id_private *cm_id_priv,
2618 struct ib_cm_sidr_req_param *param)
2619 {
2620 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2621 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2622 sidr_req_msg->request_id = cm_id_priv->id.local_id;
2623 sidr_req_msg->pkey = cpu_to_be16(param->path->pkey);
2624 sidr_req_msg->service_id = param->service_id;
2625
2626 if (param->private_data && param->private_data_len)
2627 memcpy(sidr_req_msg->private_data, param->private_data,
2628 param->private_data_len);
2629 }
2630
2631 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2632 struct ib_cm_sidr_req_param *param)
2633 {
2634 struct cm_id_private *cm_id_priv;
2635 struct ib_mad_send_buf *msg;
2636 unsigned long flags;
2637 int ret;
2638
2639 if (!param->path || (param->private_data &&
2640 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2641 return -EINVAL;
2642
2643 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2644 ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2645 if (ret)
2646 goto out;
2647
2648 cm_id->service_id = param->service_id;
2649 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
2650 cm_id_priv->timeout_ms = param->timeout_ms;
2651 cm_id_priv->max_cm_retries = param->max_cm_retries;
2652 ret = cm_alloc_msg(cm_id_priv, &msg);
2653 if (ret)
2654 goto out;
2655
2656 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2657 param);
2658 msg->timeout_ms = cm_id_priv->timeout_ms;
2659 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2660
2661 spin_lock_irqsave(&cm_id_priv->lock, flags);
2662 if (cm_id->state == IB_CM_IDLE)
2663 ret = ib_post_send_mad(msg, NULL);
2664 else
2665 ret = -EINVAL;
2666
2667 if (ret) {
2668 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2669 cm_free_msg(msg);
2670 goto out;
2671 }
2672 cm_id->state = IB_CM_SIDR_REQ_SENT;
2673 cm_id_priv->msg = msg;
2674 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2675 out:
2676 return ret;
2677 }
2678 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2679
2680 static void cm_format_sidr_req_event(struct cm_work *work,
2681 struct ib_cm_id *listen_id)
2682 {
2683 struct cm_sidr_req_msg *sidr_req_msg;
2684 struct ib_cm_sidr_req_event_param *param;
2685
2686 sidr_req_msg = (struct cm_sidr_req_msg *)
2687 work->mad_recv_wc->recv_buf.mad;
2688 param = &work->cm_event.param.sidr_req_rcvd;
2689 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2690 param->listen_id = listen_id;
2691 param->port = work->port->port_num;
2692 work->cm_event.private_data = &sidr_req_msg->private_data;
2693 }
2694
2695 static int cm_sidr_req_handler(struct cm_work *work)
2696 {
2697 struct ib_cm_id *cm_id;
2698 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2699 struct cm_sidr_req_msg *sidr_req_msg;
2700 struct ib_wc *wc;
2701 unsigned long flags;
2702
2703 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
2704 if (IS_ERR(cm_id))
2705 return PTR_ERR(cm_id);
2706 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2707
2708 /* Record SGID/SLID and request ID for lookup. */
2709 sidr_req_msg = (struct cm_sidr_req_msg *)
2710 work->mad_recv_wc->recv_buf.mad;
2711 wc = work->mad_recv_wc->wc;
2712 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2713 cm_id_priv->av.dgid.global.interface_id = 0;
2714 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2715 work->mad_recv_wc->recv_buf.grh,
2716 &cm_id_priv->av);
2717 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2718 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
2719 cm_id_priv->tid = sidr_req_msg->hdr.tid;
2720 atomic_inc(&cm_id_priv->work_count);
2721
2722 spin_lock_irqsave(&cm.lock, flags);
2723 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2724 if (cur_cm_id_priv) {
2725 spin_unlock_irqrestore(&cm.lock, flags);
2726 goto out; /* Duplicate message. */
2727 }
2728 cur_cm_id_priv = cm_find_listen(cm_id->device,
2729 sidr_req_msg->service_id,
2730 sidr_req_msg->private_data);
2731 if (!cur_cm_id_priv) {
2732 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2733 spin_unlock_irqrestore(&cm.lock, flags);
2734 /* todo: reply with no match */
2735 goto out; /* No match. */
2736 }
2737 atomic_inc(&cur_cm_id_priv->refcount);
2738 spin_unlock_irqrestore(&cm.lock, flags);
2739
2740 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2741 cm_id_priv->id.context = cur_cm_id_priv->id.context;
2742 cm_id_priv->id.service_id = sidr_req_msg->service_id;
2743 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
2744
2745 cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2746 cm_process_work(cm_id_priv, work);
2747 cm_deref_id(cur_cm_id_priv);
2748 return 0;
2749 out:
2750 ib_destroy_cm_id(&cm_id_priv->id);
2751 return -EINVAL;
2752 }
2753
2754 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
2755 struct cm_id_private *cm_id_priv,
2756 struct ib_cm_sidr_rep_param *param)
2757 {
2758 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
2759 cm_id_priv->tid);
2760 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
2761 sidr_rep_msg->status = param->status;
2762 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
2763 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
2764 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
2765
2766 if (param->info && param->info_length)
2767 memcpy(sidr_rep_msg->info, param->info, param->info_length);
2768
2769 if (param->private_data && param->private_data_len)
2770 memcpy(sidr_rep_msg->private_data, param->private_data,
2771 param->private_data_len);
2772 }
2773
2774 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
2775 struct ib_cm_sidr_rep_param *param)
2776 {
2777 struct cm_id_private *cm_id_priv;
2778 struct ib_mad_send_buf *msg;
2779 unsigned long flags;
2780 int ret;
2781
2782 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
2783 (param->private_data &&
2784 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
2785 return -EINVAL;
2786
2787 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2788 spin_lock_irqsave(&cm_id_priv->lock, flags);
2789 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
2790 ret = -EINVAL;
2791 goto error;
2792 }
2793
2794 ret = cm_alloc_msg(cm_id_priv, &msg);
2795 if (ret)
2796 goto error;
2797
2798 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
2799 param);
2800 ret = ib_post_send_mad(msg, NULL);
2801 if (ret) {
2802 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2803 cm_free_msg(msg);
2804 return ret;
2805 }
2806 cm_id->state = IB_CM_IDLE;
2807 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2808
2809 spin_lock_irqsave(&cm.lock, flags);
2810 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2811 spin_unlock_irqrestore(&cm.lock, flags);
2812 return 0;
2813
2814 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2815 return ret;
2816 }
2817 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
2818
2819 static void cm_format_sidr_rep_event(struct cm_work *work)
2820 {
2821 struct cm_sidr_rep_msg *sidr_rep_msg;
2822 struct ib_cm_sidr_rep_event_param *param;
2823
2824 sidr_rep_msg = (struct cm_sidr_rep_msg *)
2825 work->mad_recv_wc->recv_buf.mad;
2826 param = &work->cm_event.param.sidr_rep_rcvd;
2827 param->status = sidr_rep_msg->status;
2828 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
2829 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
2830 param->info = &sidr_rep_msg->info;
2831 param->info_len = sidr_rep_msg->info_length;
2832 work->cm_event.private_data = &sidr_rep_msg->private_data;
2833 }
2834
2835 static int cm_sidr_rep_handler(struct cm_work *work)
2836 {
2837 struct cm_sidr_rep_msg *sidr_rep_msg;
2838 struct cm_id_private *cm_id_priv;
2839 unsigned long flags;
2840
2841 sidr_rep_msg = (struct cm_sidr_rep_msg *)
2842 work->mad_recv_wc->recv_buf.mad;
2843 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
2844 if (!cm_id_priv)
2845 return -EINVAL; /* Unmatched reply. */
2846
2847 spin_lock_irqsave(&cm_id_priv->lock, flags);
2848 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
2849 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2850 goto out;
2851 }
2852 cm_id_priv->id.state = IB_CM_IDLE;
2853 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2854 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2855
2856 cm_format_sidr_rep_event(work);
2857 cm_process_work(cm_id_priv, work);
2858 return 0;
2859 out:
2860 cm_deref_id(cm_id_priv);
2861 return -EINVAL;
2862 }
2863
2864 static void cm_process_send_error(struct ib_mad_send_buf *msg,
2865 enum ib_wc_status wc_status)
2866 {
2867 struct cm_id_private *cm_id_priv;
2868 struct ib_cm_event cm_event;
2869 enum ib_cm_state state;
2870 unsigned long flags;
2871 int ret;
2872
2873 memset(&cm_event, 0, sizeof cm_event);
2874 cm_id_priv = msg->context[0];
2875
2876 /* Discard old sends or ones without a response. */
2877 spin_lock_irqsave(&cm_id_priv->lock, flags);
2878 state = (enum ib_cm_state) (unsigned long) msg->context[1];
2879 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
2880 goto discard;
2881
2882 switch (state) {
2883 case IB_CM_REQ_SENT:
2884 case IB_CM_MRA_REQ_RCVD:
2885 cm_reset_to_idle(cm_id_priv);
2886 cm_event.event = IB_CM_REQ_ERROR;
2887 break;
2888 case IB_CM_REP_SENT:
2889 case IB_CM_MRA_REP_RCVD:
2890 cm_reset_to_idle(cm_id_priv);
2891 cm_event.event = IB_CM_REP_ERROR;
2892 break;
2893 case IB_CM_DREQ_SENT:
2894 cm_enter_timewait(cm_id_priv);
2895 cm_event.event = IB_CM_DREQ_ERROR;
2896 break;
2897 case IB_CM_SIDR_REQ_SENT:
2898 cm_id_priv->id.state = IB_CM_IDLE;
2899 cm_event.event = IB_CM_SIDR_REQ_ERROR;
2900 break;
2901 default:
2902 goto discard;
2903 }
2904 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2905 cm_event.param.send_status = wc_status;
2906
2907 /* No other events can occur on the cm_id at this point. */
2908 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
2909 cm_free_msg(msg);
2910 if (ret)
2911 ib_destroy_cm_id(&cm_id_priv->id);
2912 return;
2913 discard:
2914 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2915 cm_free_msg(msg);
2916 }
2917
2918 static void cm_send_handler(struct ib_mad_agent *mad_agent,
2919 struct ib_mad_send_wc *mad_send_wc)
2920 {
2921 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
2922
2923 switch (mad_send_wc->status) {
2924 case IB_WC_SUCCESS:
2925 case IB_WC_WR_FLUSH_ERR:
2926 cm_free_msg(msg);
2927 break;
2928 default:
2929 if (msg->context[0] && msg->context[1])
2930 cm_process_send_error(msg, mad_send_wc->status);
2931 else
2932 cm_free_msg(msg);
2933 break;
2934 }
2935 }
2936
2937 static void cm_work_handler(void *data)
2938 {
2939 struct cm_work *work = data;
2940 int ret;
2941
2942 switch (work->cm_event.event) {
2943 case IB_CM_REQ_RECEIVED:
2944 ret = cm_req_handler(work);
2945 break;
2946 case IB_CM_MRA_RECEIVED:
2947 ret = cm_mra_handler(work);
2948 break;
2949 case IB_CM_REJ_RECEIVED:
2950 ret = cm_rej_handler(work);
2951 break;
2952 case IB_CM_REP_RECEIVED:
2953 ret = cm_rep_handler(work);
2954 break;
2955 case IB_CM_RTU_RECEIVED:
2956 ret = cm_rtu_handler(work);
2957 break;
2958 case IB_CM_USER_ESTABLISHED:
2959 ret = cm_establish_handler(work);
2960 break;
2961 case IB_CM_DREQ_RECEIVED:
2962 ret = cm_dreq_handler(work);
2963 break;
2964 case IB_CM_DREP_RECEIVED:
2965 ret = cm_drep_handler(work);
2966 break;
2967 case IB_CM_SIDR_REQ_RECEIVED:
2968 ret = cm_sidr_req_handler(work);
2969 break;
2970 case IB_CM_SIDR_REP_RECEIVED:
2971 ret = cm_sidr_rep_handler(work);
2972 break;
2973 case IB_CM_LAP_RECEIVED:
2974 ret = cm_lap_handler(work);
2975 break;
2976 case IB_CM_APR_RECEIVED:
2977 ret = cm_apr_handler(work);
2978 break;
2979 case IB_CM_TIMEWAIT_EXIT:
2980 ret = cm_timewait_handler(work);
2981 break;
2982 default:
2983 ret = -EINVAL;
2984 break;
2985 }
2986 if (ret)
2987 cm_free_work(work);
2988 }
2989
2990 int ib_cm_establish(struct ib_cm_id *cm_id)
2991 {
2992 struct cm_id_private *cm_id_priv;
2993 struct cm_work *work;
2994 unsigned long flags;
2995 int ret = 0;
2996
2997 work = kmalloc(sizeof *work, GFP_ATOMIC);
2998 if (!work)
2999 return -ENOMEM;
3000
3001 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3002 spin_lock_irqsave(&cm_id_priv->lock, flags);
3003 switch (cm_id->state)
3004 {
3005 case IB_CM_REP_SENT:
3006 case IB_CM_MRA_REP_RCVD:
3007 cm_id->state = IB_CM_ESTABLISHED;
3008 break;
3009 case IB_CM_ESTABLISHED:
3010 ret = -EISCONN;
3011 break;
3012 default:
3013 ret = -EINVAL;
3014 break;
3015 }
3016 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3017
3018 if (ret) {
3019 kfree(work);
3020 goto out;
3021 }
3022
3023 /*
3024 * The CM worker thread may try to destroy the cm_id before it
3025 * can execute this work item. To prevent potential deadlock,
3026 * we need to find the cm_id once we're in the context of the
3027 * worker thread, rather than holding a reference on it.
3028 */
3029 INIT_WORK(&work->work, cm_work_handler, work);
3030 work->local_id = cm_id->local_id;
3031 work->remote_id = cm_id->remote_id;
3032 work->mad_recv_wc = NULL;
3033 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3034 queue_work(cm.wq, &work->work);
3035 out:
3036 return ret;
3037 }
3038 EXPORT_SYMBOL(ib_cm_establish);
3039
3040 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3041 struct ib_mad_recv_wc *mad_recv_wc)
3042 {
3043 struct cm_work *work;
3044 enum ib_cm_event_type event;
3045 int paths = 0;
3046
3047 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3048 case CM_REQ_ATTR_ID:
3049 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3050 alt_local_lid != 0);
3051 event = IB_CM_REQ_RECEIVED;
3052 break;
3053 case CM_MRA_ATTR_ID:
3054 event = IB_CM_MRA_RECEIVED;
3055 break;
3056 case CM_REJ_ATTR_ID:
3057 event = IB_CM_REJ_RECEIVED;
3058 break;
3059 case CM_REP_ATTR_ID:
3060 event = IB_CM_REP_RECEIVED;
3061 break;
3062 case CM_RTU_ATTR_ID:
3063 event = IB_CM_RTU_RECEIVED;
3064 break;
3065 case CM_DREQ_ATTR_ID:
3066 event = IB_CM_DREQ_RECEIVED;
3067 break;
3068 case CM_DREP_ATTR_ID:
3069 event = IB_CM_DREP_RECEIVED;
3070 break;
3071 case CM_SIDR_REQ_ATTR_ID:
3072 event = IB_CM_SIDR_REQ_RECEIVED;
3073 break;
3074 case CM_SIDR_REP_ATTR_ID:
3075 event = IB_CM_SIDR_REP_RECEIVED;
3076 break;
3077 case CM_LAP_ATTR_ID:
3078 paths = 1;
3079 event = IB_CM_LAP_RECEIVED;
3080 break;
3081 case CM_APR_ATTR_ID:
3082 event = IB_CM_APR_RECEIVED;
3083 break;
3084 default:
3085 ib_free_recv_mad(mad_recv_wc);
3086 return;
3087 }
3088
3089 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3090 GFP_KERNEL);
3091 if (!work) {
3092 ib_free_recv_mad(mad_recv_wc);
3093 return;
3094 }
3095
3096 INIT_WORK(&work->work, cm_work_handler, work);
3097 work->cm_event.event = event;
3098 work->mad_recv_wc = mad_recv_wc;
3099 work->port = (struct cm_port *)mad_agent->context;
3100 queue_work(cm.wq, &work->work);
3101 }
3102
3103 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3104 struct ib_qp_attr *qp_attr,
3105 int *qp_attr_mask)
3106 {
3107 unsigned long flags;
3108 int ret;
3109
3110 spin_lock_irqsave(&cm_id_priv->lock, flags);
3111 switch (cm_id_priv->id.state) {
3112 case IB_CM_REQ_SENT:
3113 case IB_CM_MRA_REQ_RCVD:
3114 case IB_CM_REQ_RCVD:
3115 case IB_CM_MRA_REQ_SENT:
3116 case IB_CM_REP_RCVD:
3117 case IB_CM_MRA_REP_SENT:
3118 case IB_CM_REP_SENT:
3119 case IB_CM_MRA_REP_RCVD:
3120 case IB_CM_ESTABLISHED:
3121 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3122 IB_QP_PKEY_INDEX | IB_QP_PORT;
3123 qp_attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE |
3124 IB_ACCESS_REMOTE_WRITE;
3125 if (cm_id_priv->responder_resources)
3126 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ;
3127 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3128 qp_attr->port_num = cm_id_priv->av.port->port_num;
3129 ret = 0;
3130 break;
3131 default:
3132 ret = -EINVAL;
3133 break;
3134 }
3135 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3136 return ret;
3137 }
3138
3139 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3140 struct ib_qp_attr *qp_attr,
3141 int *qp_attr_mask)
3142 {
3143 unsigned long flags;
3144 int ret;
3145
3146 spin_lock_irqsave(&cm_id_priv->lock, flags);
3147 switch (cm_id_priv->id.state) {
3148 case IB_CM_REQ_RCVD:
3149 case IB_CM_MRA_REQ_SENT:
3150 case IB_CM_REP_RCVD:
3151 case IB_CM_MRA_REP_SENT:
3152 case IB_CM_REP_SENT:
3153 case IB_CM_MRA_REP_RCVD:
3154 case IB_CM_ESTABLISHED:
3155 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3156 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3157 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3158 qp_attr->path_mtu = cm_id_priv->path_mtu;
3159 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3160 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3161 if (cm_id_priv->qp_type == IB_QPT_RC) {
3162 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3163 IB_QP_MIN_RNR_TIMER;
3164 qp_attr->max_dest_rd_atomic =
3165 cm_id_priv->responder_resources;
3166 qp_attr->min_rnr_timer = 0;
3167 }
3168 if (cm_id_priv->alt_av.ah_attr.dlid) {
3169 *qp_attr_mask |= IB_QP_ALT_PATH;
3170 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3171 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3172 }
3173 ret = 0;
3174 break;
3175 default:
3176 ret = -EINVAL;
3177 break;
3178 }
3179 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3180 return ret;
3181 }
3182
3183 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3184 struct ib_qp_attr *qp_attr,
3185 int *qp_attr_mask)
3186 {
3187 unsigned long flags;
3188 int ret;
3189
3190 spin_lock_irqsave(&cm_id_priv->lock, flags);
3191 switch (cm_id_priv->id.state) {
3192 case IB_CM_REP_RCVD:
3193 case IB_CM_MRA_REP_SENT:
3194 case IB_CM_REP_SENT:
3195 case IB_CM_MRA_REP_RCVD:
3196 case IB_CM_ESTABLISHED:
3197 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3198 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3199 if (cm_id_priv->qp_type == IB_QPT_RC) {
3200 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3201 IB_QP_RNR_RETRY |
3202 IB_QP_MAX_QP_RD_ATOMIC;
3203 qp_attr->timeout = cm_id_priv->local_ack_timeout;
3204 qp_attr->retry_cnt = cm_id_priv->retry_count;
3205 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3206 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3207 }
3208 if (cm_id_priv->alt_av.ah_attr.dlid) {
3209 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3210 qp_attr->path_mig_state = IB_MIG_REARM;
3211 }
3212 ret = 0;
3213 break;
3214 default:
3215 ret = -EINVAL;
3216 break;
3217 }
3218 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3219 return ret;
3220 }
3221
3222 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3223 struct ib_qp_attr *qp_attr,
3224 int *qp_attr_mask)
3225 {
3226 struct cm_id_private *cm_id_priv;
3227 int ret;
3228
3229 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3230 switch (qp_attr->qp_state) {
3231 case IB_QPS_INIT:
3232 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3233 break;
3234 case IB_QPS_RTR:
3235 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3236 break;
3237 case IB_QPS_RTS:
3238 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3239 break;
3240 default:
3241 ret = -EINVAL;
3242 break;
3243 }
3244 return ret;
3245 }
3246 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3247
3248 static void cm_add_one(struct ib_device *device)
3249 {
3250 struct cm_device *cm_dev;
3251 struct cm_port *port;
3252 struct ib_mad_reg_req reg_req = {
3253 .mgmt_class = IB_MGMT_CLASS_CM,
3254 .mgmt_class_version = IB_CM_CLASS_VERSION
3255 };
3256 struct ib_port_modify port_modify = {
3257 .set_port_cap_mask = IB_PORT_CM_SUP
3258 };
3259 unsigned long flags;
3260 int ret;
3261 u8 i;
3262
3263 cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) *
3264 device->phys_port_cnt, GFP_KERNEL);
3265 if (!cm_dev)
3266 return;
3267
3268 cm_dev->device = device;
3269 cm_dev->ca_guid = device->node_guid;
3270
3271 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3272 for (i = 1; i <= device->phys_port_cnt; i++) {
3273 port = &cm_dev->port[i-1];
3274 port->cm_dev = cm_dev;
3275 port->port_num = i;
3276 port->mad_agent = ib_register_mad_agent(device, i,
3277 IB_QPT_GSI,
3278 &reg_req,
3279 0,
3280 cm_send_handler,
3281 cm_recv_handler,
3282 port);
3283 if (IS_ERR(port->mad_agent))
3284 goto error1;
3285
3286 ret = ib_modify_port(device, i, 0, &port_modify);
3287 if (ret)
3288 goto error2;
3289 }
3290 ib_set_client_data(device, &cm_client, cm_dev);
3291
3292 write_lock_irqsave(&cm.device_lock, flags);
3293 list_add_tail(&cm_dev->list, &cm.device_list);
3294 write_unlock_irqrestore(&cm.device_lock, flags);
3295 return;
3296
3297 error2:
3298 ib_unregister_mad_agent(port->mad_agent);
3299 error1:
3300 port_modify.set_port_cap_mask = 0;
3301 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3302 while (--i) {
3303 port = &cm_dev->port[i-1];
3304 ib_modify_port(device, port->port_num, 0, &port_modify);
3305 ib_unregister_mad_agent(port->mad_agent);
3306 }
3307 kfree(cm_dev);
3308 }
3309
3310 static void cm_remove_one(struct ib_device *device)
3311 {
3312 struct cm_device *cm_dev;
3313 struct cm_port *port;
3314 struct ib_port_modify port_modify = {
3315 .clr_port_cap_mask = IB_PORT_CM_SUP
3316 };
3317 unsigned long flags;
3318 int i;
3319
3320 cm_dev = ib_get_client_data(device, &cm_client);
3321 if (!cm_dev)
3322 return;
3323
3324 write_lock_irqsave(&cm.device_lock, flags);
3325 list_del(&cm_dev->list);
3326 write_unlock_irqrestore(&cm.device_lock, flags);
3327
3328 for (i = 1; i <= device->phys_port_cnt; i++) {
3329 port = &cm_dev->port[i-1];
3330 ib_modify_port(device, port->port_num, 0, &port_modify);
3331 ib_unregister_mad_agent(port->mad_agent);
3332 }
3333 kfree(cm_dev);
3334 }
3335
3336 static int __init ib_cm_init(void)
3337 {
3338 int ret;
3339
3340 memset(&cm, 0, sizeof cm);
3341 INIT_LIST_HEAD(&cm.device_list);
3342 rwlock_init(&cm.device_lock);
3343 spin_lock_init(&cm.lock);
3344 cm.listen_service_table = RB_ROOT;
3345 cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3346 cm.remote_id_table = RB_ROOT;
3347 cm.remote_qp_table = RB_ROOT;
3348 cm.remote_sidr_table = RB_ROOT;
3349 idr_init(&cm.local_id_table);
3350 idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3351
3352 cm.wq = create_workqueue("ib_cm");
3353 if (!cm.wq)
3354 return -ENOMEM;
3355
3356 ret = ib_register_client(&cm_client);
3357 if (ret)
3358 goto error;
3359
3360 return 0;
3361 error:
3362 destroy_workqueue(cm.wq);
3363 return ret;
3364 }
3365
3366 static void __exit ib_cm_cleanup(void)
3367 {
3368 destroy_workqueue(cm.wq);
3369 ib_unregister_client(&cm_client);
3370 idr_destroy(&cm.local_id_table);
3371 }
3372
3373 module_init(ib_cm_init);
3374 module_exit(ib_cm_cleanup);
3375
Linux kernel - Deliverables
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