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of: MSI: Simplify irqdomain lookup
[linux/fpc-iii.git] / drivers / infiniband / core / cm.c
blob0a26dd6d9b19f96d97c9b3b244509892afae7023
1 /*
2 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved.
3 * Copyright (c) 2004 Topspin Corporation. All rights reserved.
4 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved.
5 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 */
35
36 #include <linux/completion.h>
37 #include <linux/dma-mapping.h>
38 #include <linux/device.h>
39 #include <linux/module.h>
40 #include <linux/err.h>
41 #include <linux/idr.h>
42 #include <linux/interrupt.h>
43 #include <linux/random.h>
44 #include <linux/rbtree.h>
45 #include <linux/spinlock.h>
46 #include <linux/slab.h>
47 #include <linux/sysfs.h>
48 #include <linux/workqueue.h>
49 #include <linux/kdev_t.h>
50 #include <linux/etherdevice.h>
51
52 #include <rdma/ib_cache.h>
53 #include <rdma/ib_cm.h>
54 #include "cm_msgs.h"
55
56 MODULE_AUTHOR("Sean Hefty");
57 MODULE_DESCRIPTION("InfiniBand CM");
58 MODULE_LICENSE("Dual BSD/GPL");
59
60 static void cm_add_one(struct ib_device *device);
61 static void cm_remove_one(struct ib_device *device, void *client_data);
62
63 static struct ib_client cm_client = {
64 .name = "cm",
65 .add = cm_add_one,
66 .remove = cm_remove_one
67 };
68
69 static struct ib_cm {
70 spinlock_t lock;
71 struct list_head device_list;
72 rwlock_t device_lock;
73 struct rb_root listen_service_table;
74 u64 listen_service_id;
75 /* struct rb_root peer_service_table; todo: fix peer to peer */
76 struct rb_root remote_qp_table;
77 struct rb_root remote_id_table;
78 struct rb_root remote_sidr_table;
79 struct idr local_id_table;
80 __be32 random_id_operand;
81 struct list_head timewait_list;
82 struct workqueue_struct *wq;
83 } cm;
84
85 /* Counter indexes ordered by attribute ID */
86 enum {
87 CM_REQ_COUNTER,
88 CM_MRA_COUNTER,
89 CM_REJ_COUNTER,
90 CM_REP_COUNTER,
91 CM_RTU_COUNTER,
92 CM_DREQ_COUNTER,
93 CM_DREP_COUNTER,
94 CM_SIDR_REQ_COUNTER,
95 CM_SIDR_REP_COUNTER,
96 CM_LAP_COUNTER,
97 CM_APR_COUNTER,
98 CM_ATTR_COUNT,
99 CM_ATTR_ID_OFFSET = 0x0010,
100 };
101
102 enum {
103 CM_XMIT,
104 CM_XMIT_RETRIES,
105 CM_RECV,
106 CM_RECV_DUPLICATES,
107 CM_COUNTER_GROUPS
108 };
109
110 static char const counter_group_names[CM_COUNTER_GROUPS]
111 [sizeof("cm_rx_duplicates")] = {
112 "cm_tx_msgs", "cm_tx_retries",
113 "cm_rx_msgs", "cm_rx_duplicates"
114 };
115
116 struct cm_counter_group {
117 struct kobject obj;
118 atomic_long_t counter[CM_ATTR_COUNT];
119 };
120
121 struct cm_counter_attribute {
122 struct attribute attr;
123 int index;
124 };
125
126 #define CM_COUNTER_ATTR(_name, _index) \
127 struct cm_counter_attribute cm_##_name##_counter_attr = { \
128 .attr = { .name = __stringify(_name), .mode = 0444 }, \
129 .index = _index \
130 }
131
132 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
133 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
134 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
135 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
136 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
137 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
138 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
139 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
140 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
141 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
142 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
143
144 static struct attribute *cm_counter_default_attrs[] = {
145 &cm_req_counter_attr.attr,
146 &cm_mra_counter_attr.attr,
147 &cm_rej_counter_attr.attr,
148 &cm_rep_counter_attr.attr,
149 &cm_rtu_counter_attr.attr,
150 &cm_dreq_counter_attr.attr,
151 &cm_drep_counter_attr.attr,
152 &cm_sidr_req_counter_attr.attr,
153 &cm_sidr_rep_counter_attr.attr,
154 &cm_lap_counter_attr.attr,
155 &cm_apr_counter_attr.attr,
156 NULL
157 };
158
159 struct cm_port {
160 struct cm_device *cm_dev;
161 struct ib_mad_agent *mad_agent;
162 struct kobject port_obj;
163 u8 port_num;
164 struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
165 };
166
167 struct cm_device {
168 struct list_head list;
169 struct ib_device *ib_device;
170 struct device *device;
171 u8 ack_delay;
172 int going_down;
173 struct cm_port *port[0];
174 };
175
176 struct cm_av {
177 struct cm_port *port;
178 union ib_gid dgid;
179 struct ib_ah_attr ah_attr;
180 u16 pkey_index;
181 u8 timeout;
182 };
183
184 struct cm_work {
185 struct delayed_work work;
186 struct list_head list;
187 struct cm_port *port;
188 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
189 __be32 local_id; /* Established / timewait */
190 __be32 remote_id;
191 struct ib_cm_event cm_event;
192 struct ib_sa_path_rec path[0];
193 };
194
195 struct cm_timewait_info {
196 struct cm_work work; /* Must be first. */
197 struct list_head list;
198 struct rb_node remote_qp_node;
199 struct rb_node remote_id_node;
200 __be64 remote_ca_guid;
201 __be32 remote_qpn;
202 u8 inserted_remote_qp;
203 u8 inserted_remote_id;
204 };
205
206 struct cm_id_private {
207 struct ib_cm_id id;
208
209 struct rb_node service_node;
210 struct rb_node sidr_id_node;
211 spinlock_t lock; /* Do not acquire inside cm.lock */
212 struct completion comp;
213 atomic_t refcount;
214 /* Number of clients sharing this ib_cm_id. Only valid for listeners.
215 * Protected by the cm.lock spinlock. */
216 int listen_sharecount;
217
218 struct ib_mad_send_buf *msg;
219 struct cm_timewait_info *timewait_info;
220 /* todo: use alternate port on send failure */
221 struct cm_av av;
222 struct cm_av alt_av;
223
224 void *private_data;
225 __be64 tid;
226 __be32 local_qpn;
227 __be32 remote_qpn;
228 enum ib_qp_type qp_type;
229 __be32 sq_psn;
230 __be32 rq_psn;
231 int timeout_ms;
232 enum ib_mtu path_mtu;
233 __be16 pkey;
234 u8 private_data_len;
235 u8 max_cm_retries;
236 u8 peer_to_peer;
237 u8 responder_resources;
238 u8 initiator_depth;
239 u8 retry_count;
240 u8 rnr_retry_count;
241 u8 service_timeout;
242 u8 target_ack_delay;
243
244 struct list_head work_list;
245 atomic_t work_count;
246 };
247
248 static void cm_work_handler(struct work_struct *work);
249
250 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
251 {
252 if (atomic_dec_and_test(&cm_id_priv->refcount))
253 complete(&cm_id_priv->comp);
254 }
255
256 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
257 struct ib_mad_send_buf **msg)
258 {
259 struct ib_mad_agent *mad_agent;
260 struct ib_mad_send_buf *m;
261 struct ib_ah *ah;
262
263 mad_agent = cm_id_priv->av.port->mad_agent;
264 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
265 if (IS_ERR(ah))
266 return PTR_ERR(ah);
267
268 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
269 cm_id_priv->av.pkey_index,
270 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
271 GFP_ATOMIC,
272 IB_MGMT_BASE_VERSION);
273 if (IS_ERR(m)) {
274 ib_destroy_ah(ah);
275 return PTR_ERR(m);
276 }
277
278 /* Timeout set by caller if response is expected. */
279 m->ah = ah;
280 m->retries = cm_id_priv->max_cm_retries;
281
282 atomic_inc(&cm_id_priv->refcount);
283 m->context[0] = cm_id_priv;
284 *msg = m;
285 return 0;
286 }
287
288 static int cm_alloc_response_msg(struct cm_port *port,
289 struct ib_mad_recv_wc *mad_recv_wc,
290 struct ib_mad_send_buf **msg)
291 {
292 struct ib_mad_send_buf *m;
293 struct ib_ah *ah;
294
295 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
296 mad_recv_wc->recv_buf.grh, port->port_num);
297 if (IS_ERR(ah))
298 return PTR_ERR(ah);
299
300 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
301 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
302 GFP_ATOMIC,
303 IB_MGMT_BASE_VERSION);
304 if (IS_ERR(m)) {
305 ib_destroy_ah(ah);
306 return PTR_ERR(m);
307 }
308 m->ah = ah;
309 *msg = m;
310 return 0;
311 }
312
313 static void cm_free_msg(struct ib_mad_send_buf *msg)
314 {
315 ib_destroy_ah(msg->ah);
316 if (msg->context[0])
317 cm_deref_id(msg->context[0]);
318 ib_free_send_mad(msg);
319 }
320
321 static void * cm_copy_private_data(const void *private_data,
322 u8 private_data_len)
323 {
324 void *data;
325
326 if (!private_data || !private_data_len)
327 return NULL;
328
329 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
330 if (!data)
331 return ERR_PTR(-ENOMEM);
332
333 return data;
334 }
335
336 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
337 void *private_data, u8 private_data_len)
338 {
339 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
340 kfree(cm_id_priv->private_data);
341
342 cm_id_priv->private_data = private_data;
343 cm_id_priv->private_data_len = private_data_len;
344 }
345
346 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
347 struct ib_grh *grh, struct cm_av *av)
348 {
349 av->port = port;
350 av->pkey_index = wc->pkey_index;
351 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc,
352 grh, &av->ah_attr);
353 }
354
355 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
356 {
357 struct cm_device *cm_dev;
358 struct cm_port *port = NULL;
359 unsigned long flags;
360 int ret;
361 u8 p;
362 struct net_device *ndev = ib_get_ndev_from_path(path);
363
364 read_lock_irqsave(&cm.device_lock, flags);
365 list_for_each_entry(cm_dev, &cm.device_list, list) {
366 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid,
367 ndev, &p, NULL)) {
368 port = cm_dev->port[p-1];
369 break;
370 }
371 }
372 read_unlock_irqrestore(&cm.device_lock, flags);
373
374 if (ndev)
375 dev_put(ndev);
376
377 if (!port)
378 return -EINVAL;
379
380 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
381 be16_to_cpu(path->pkey), &av->pkey_index);
382 if (ret)
383 return ret;
384
385 av->port = port;
386 ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path,
387 &av->ah_attr);
388 av->timeout = path->packet_life_time + 1;
389
390 return 0;
391 }
392
393 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
394 {
395 unsigned long flags;
396 int id;
397
398 idr_preload(GFP_KERNEL);
399 spin_lock_irqsave(&cm.lock, flags);
400
401 id = idr_alloc_cyclic(&cm.local_id_table, cm_id_priv, 0, 0, GFP_NOWAIT);
402
403 spin_unlock_irqrestore(&cm.lock, flags);
404 idr_preload_end();
405
406 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
407 return id < 0 ? id : 0;
408 }
409
410 static void cm_free_id(__be32 local_id)
411 {
412 spin_lock_irq(&cm.lock);
413 idr_remove(&cm.local_id_table,
414 (__force int) (local_id ^ cm.random_id_operand));
415 spin_unlock_irq(&cm.lock);
416 }
417
418 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
419 {
420 struct cm_id_private *cm_id_priv;
421
422 cm_id_priv = idr_find(&cm.local_id_table,
423 (__force int) (local_id ^ cm.random_id_operand));
424 if (cm_id_priv) {
425 if (cm_id_priv->id.remote_id == remote_id)
426 atomic_inc(&cm_id_priv->refcount);
427 else
428 cm_id_priv = NULL;
429 }
430
431 return cm_id_priv;
432 }
433
434 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
435 {
436 struct cm_id_private *cm_id_priv;
437
438 spin_lock_irq(&cm.lock);
439 cm_id_priv = cm_get_id(local_id, remote_id);
440 spin_unlock_irq(&cm.lock);
441
442 return cm_id_priv;
443 }
444
445 /*
446 * Trivial helpers to strip endian annotation and compare; the
447 * endianness doesn't actually matter since we just need a stable
448 * order for the RB tree.
449 */
450 static int be32_lt(__be32 a, __be32 b)
451 {
452 return (__force u32) a < (__force u32) b;
453 }
454
455 static int be32_gt(__be32 a, __be32 b)
456 {
457 return (__force u32) a > (__force u32) b;
458 }
459
460 static int be64_lt(__be64 a, __be64 b)
461 {
462 return (__force u64) a < (__force u64) b;
463 }
464
465 static int be64_gt(__be64 a, __be64 b)
466 {
467 return (__force u64) a > (__force u64) b;
468 }
469
470 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
471 {
472 struct rb_node **link = &cm.listen_service_table.rb_node;
473 struct rb_node *parent = NULL;
474 struct cm_id_private *cur_cm_id_priv;
475 __be64 service_id = cm_id_priv->id.service_id;
476 __be64 service_mask = cm_id_priv->id.service_mask;
477
478 while (*link) {
479 parent = *link;
480 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
481 service_node);
482 if ((cur_cm_id_priv->id.service_mask & service_id) ==
483 (service_mask & cur_cm_id_priv->id.service_id) &&
484 (cm_id_priv->id.device == cur_cm_id_priv->id.device))
485 return cur_cm_id_priv;
486
487 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
488 link = &(*link)->rb_left;
489 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
490 link = &(*link)->rb_right;
491 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
492 link = &(*link)->rb_left;
493 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
494 link = &(*link)->rb_right;
495 else
496 link = &(*link)->rb_right;
497 }
498 rb_link_node(&cm_id_priv->service_node, parent, link);
499 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
500 return NULL;
501 }
502
503 static struct cm_id_private * cm_find_listen(struct ib_device *device,
504 __be64 service_id)
505 {
506 struct rb_node *node = cm.listen_service_table.rb_node;
507 struct cm_id_private *cm_id_priv;
508
509 while (node) {
510 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
511 if ((cm_id_priv->id.service_mask & service_id) ==
512 cm_id_priv->id.service_id &&
513 (cm_id_priv->id.device == device))
514 return cm_id_priv;
515
516 if (device < cm_id_priv->id.device)
517 node = node->rb_left;
518 else if (device > cm_id_priv->id.device)
519 node = node->rb_right;
520 else if (be64_lt(service_id, cm_id_priv->id.service_id))
521 node = node->rb_left;
522 else if (be64_gt(service_id, cm_id_priv->id.service_id))
523 node = node->rb_right;
524 else
525 node = node->rb_right;
526 }
527 return NULL;
528 }
529
530 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
531 *timewait_info)
532 {
533 struct rb_node **link = &cm.remote_id_table.rb_node;
534 struct rb_node *parent = NULL;
535 struct cm_timewait_info *cur_timewait_info;
536 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
537 __be32 remote_id = timewait_info->work.remote_id;
538
539 while (*link) {
540 parent = *link;
541 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
542 remote_id_node);
543 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
544 link = &(*link)->rb_left;
545 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
546 link = &(*link)->rb_right;
547 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
548 link = &(*link)->rb_left;
549 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
550 link = &(*link)->rb_right;
551 else
552 return cur_timewait_info;
553 }
554 timewait_info->inserted_remote_id = 1;
555 rb_link_node(&timewait_info->remote_id_node, parent, link);
556 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
557 return NULL;
558 }
559
560 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
561 __be32 remote_id)
562 {
563 struct rb_node *node = cm.remote_id_table.rb_node;
564 struct cm_timewait_info *timewait_info;
565
566 while (node) {
567 timewait_info = rb_entry(node, struct cm_timewait_info,
568 remote_id_node);
569 if (be32_lt(remote_id, timewait_info->work.remote_id))
570 node = node->rb_left;
571 else if (be32_gt(remote_id, timewait_info->work.remote_id))
572 node = node->rb_right;
573 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
574 node = node->rb_left;
575 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
576 node = node->rb_right;
577 else
578 return timewait_info;
579 }
580 return NULL;
581 }
582
583 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
584 *timewait_info)
585 {
586 struct rb_node **link = &cm.remote_qp_table.rb_node;
587 struct rb_node *parent = NULL;
588 struct cm_timewait_info *cur_timewait_info;
589 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
590 __be32 remote_qpn = timewait_info->remote_qpn;
591
592 while (*link) {
593 parent = *link;
594 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
595 remote_qp_node);
596 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
597 link = &(*link)->rb_left;
598 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
599 link = &(*link)->rb_right;
600 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
601 link = &(*link)->rb_left;
602 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
603 link = &(*link)->rb_right;
604 else
605 return cur_timewait_info;
606 }
607 timewait_info->inserted_remote_qp = 1;
608 rb_link_node(&timewait_info->remote_qp_node, parent, link);
609 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
610 return NULL;
611 }
612
613 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
614 *cm_id_priv)
615 {
616 struct rb_node **link = &cm.remote_sidr_table.rb_node;
617 struct rb_node *parent = NULL;
618 struct cm_id_private *cur_cm_id_priv;
619 union ib_gid *port_gid = &cm_id_priv->av.dgid;
620 __be32 remote_id = cm_id_priv->id.remote_id;
621
622 while (*link) {
623 parent = *link;
624 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
625 sidr_id_node);
626 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
627 link = &(*link)->rb_left;
628 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
629 link = &(*link)->rb_right;
630 else {
631 int cmp;
632 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
633 sizeof *port_gid);
634 if (cmp < 0)
635 link = &(*link)->rb_left;
636 else if (cmp > 0)
637 link = &(*link)->rb_right;
638 else
639 return cur_cm_id_priv;
640 }
641 }
642 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
643 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
644 return NULL;
645 }
646
647 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
648 enum ib_cm_sidr_status status)
649 {
650 struct ib_cm_sidr_rep_param param;
651
652 memset(&param, 0, sizeof param);
653 param.status = status;
654 ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
655 }
656
657 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
658 ib_cm_handler cm_handler,
659 void *context)
660 {
661 struct cm_id_private *cm_id_priv;
662 int ret;
663
664 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
665 if (!cm_id_priv)
666 return ERR_PTR(-ENOMEM);
667
668 cm_id_priv->id.state = IB_CM_IDLE;
669 cm_id_priv->id.device = device;
670 cm_id_priv->id.cm_handler = cm_handler;
671 cm_id_priv->id.context = context;
672 cm_id_priv->id.remote_cm_qpn = 1;
673 ret = cm_alloc_id(cm_id_priv);
674 if (ret)
675 goto error;
676
677 spin_lock_init(&cm_id_priv->lock);
678 init_completion(&cm_id_priv->comp);
679 INIT_LIST_HEAD(&cm_id_priv->work_list);
680 atomic_set(&cm_id_priv->work_count, -1);
681 atomic_set(&cm_id_priv->refcount, 1);
682 return &cm_id_priv->id;
683
684 error:
685 kfree(cm_id_priv);
686 return ERR_PTR(-ENOMEM);
687 }
688 EXPORT_SYMBOL(ib_create_cm_id);
689
690 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
691 {
692 struct cm_work *work;
693
694 if (list_empty(&cm_id_priv->work_list))
695 return NULL;
696
697 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
698 list_del(&work->list);
699 return work;
700 }
701
702 static void cm_free_work(struct cm_work *work)
703 {
704 if (work->mad_recv_wc)
705 ib_free_recv_mad(work->mad_recv_wc);
706 kfree(work);
707 }
708
709 static inline int cm_convert_to_ms(int iba_time)
710 {
711 /* approximate conversion to ms from 4.096us x 2^iba_time */
712 return 1 << max(iba_time - 8, 0);
713 }
714
715 /*
716 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
717 * Because of how ack_timeout is stored, adding one doubles the timeout.
718 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
719 * increment it (round up) only if the other is within 50%.
720 */
721 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
722 {
723 int ack_timeout = packet_life_time + 1;
724
725 if (ack_timeout >= ca_ack_delay)
726 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
727 else
728 ack_timeout = ca_ack_delay +
729 (ack_timeout >= (ca_ack_delay - 1));
730
731 return min(31, ack_timeout);
732 }
733
734 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
735 {
736 if (timewait_info->inserted_remote_id) {
737 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
738 timewait_info->inserted_remote_id = 0;
739 }
740
741 if (timewait_info->inserted_remote_qp) {
742 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
743 timewait_info->inserted_remote_qp = 0;
744 }
745 }
746
747 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
748 {
749 struct cm_timewait_info *timewait_info;
750
751 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
752 if (!timewait_info)
753 return ERR_PTR(-ENOMEM);
754
755 timewait_info->work.local_id = local_id;
756 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
757 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
758 return timewait_info;
759 }
760
761 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
762 {
763 int wait_time;
764 unsigned long flags;
765 struct cm_device *cm_dev;
766
767 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client);
768 if (!cm_dev)
769 return;
770
771 spin_lock_irqsave(&cm.lock, flags);
772 cm_cleanup_timewait(cm_id_priv->timewait_info);
773 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
774 spin_unlock_irqrestore(&cm.lock, flags);
775
776 /*
777 * The cm_id could be destroyed by the user before we exit timewait.
778 * To protect against this, we search for the cm_id after exiting
779 * timewait before notifying the user that we've exited timewait.
780 */
781 cm_id_priv->id.state = IB_CM_TIMEWAIT;
782 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
783
784 /* Check if the device started its remove_one */
785 spin_lock_irq(&cm.lock);
786 if (!cm_dev->going_down)
787 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
788 msecs_to_jiffies(wait_time));
789 spin_unlock_irq(&cm.lock);
790
791 cm_id_priv->timewait_info = NULL;
792 }
793
794 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
795 {
796 unsigned long flags;
797
798 cm_id_priv->id.state = IB_CM_IDLE;
799 if (cm_id_priv->timewait_info) {
800 spin_lock_irqsave(&cm.lock, flags);
801 cm_cleanup_timewait(cm_id_priv->timewait_info);
802 spin_unlock_irqrestore(&cm.lock, flags);
803 kfree(cm_id_priv->timewait_info);
804 cm_id_priv->timewait_info = NULL;
805 }
806 }
807
808 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
809 {
810 struct cm_id_private *cm_id_priv;
811 struct cm_work *work;
812
813 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
814 retest:
815 spin_lock_irq(&cm_id_priv->lock);
816 switch (cm_id->state) {
817 case IB_CM_LISTEN:
818 spin_unlock_irq(&cm_id_priv->lock);
819
820 spin_lock_irq(&cm.lock);
821 if (--cm_id_priv->listen_sharecount > 0) {
822 /* The id is still shared. */
823 cm_deref_id(cm_id_priv);
824 spin_unlock_irq(&cm.lock);
825 return;
826 }
827 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
828 spin_unlock_irq(&cm.lock);
829 break;
830 case IB_CM_SIDR_REQ_SENT:
831 cm_id->state = IB_CM_IDLE;
832 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
833 spin_unlock_irq(&cm_id_priv->lock);
834 break;
835 case IB_CM_SIDR_REQ_RCVD:
836 spin_unlock_irq(&cm_id_priv->lock);
837 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
838 spin_lock_irq(&cm.lock);
839 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node))
840 rb_erase(&cm_id_priv->sidr_id_node,
841 &cm.remote_sidr_table);
842 spin_unlock_irq(&cm.lock);
843 break;
844 case IB_CM_REQ_SENT:
845 case IB_CM_MRA_REQ_RCVD:
846 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
847 spin_unlock_irq(&cm_id_priv->lock);
848 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
849 &cm_id_priv->id.device->node_guid,
850 sizeof cm_id_priv->id.device->node_guid,
851 NULL, 0);
852 break;
853 case IB_CM_REQ_RCVD:
854 if (err == -ENOMEM) {
855 /* Do not reject to allow future retries. */
856 cm_reset_to_idle(cm_id_priv);
857 spin_unlock_irq(&cm_id_priv->lock);
858 } else {
859 spin_unlock_irq(&cm_id_priv->lock);
860 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
861 NULL, 0, NULL, 0);
862 }
863 break;
864 case IB_CM_REP_SENT:
865 case IB_CM_MRA_REP_RCVD:
866 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
867 /* Fall through */
868 case IB_CM_MRA_REQ_SENT:
869 case IB_CM_REP_RCVD:
870 case IB_CM_MRA_REP_SENT:
871 spin_unlock_irq(&cm_id_priv->lock);
872 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
873 NULL, 0, NULL, 0);
874 break;
875 case IB_CM_ESTABLISHED:
876 spin_unlock_irq(&cm_id_priv->lock);
877 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT)
878 break;
879 ib_send_cm_dreq(cm_id, NULL, 0);
880 goto retest;
881 case IB_CM_DREQ_SENT:
882 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
883 cm_enter_timewait(cm_id_priv);
884 spin_unlock_irq(&cm_id_priv->lock);
885 break;
886 case IB_CM_DREQ_RCVD:
887 spin_unlock_irq(&cm_id_priv->lock);
888 ib_send_cm_drep(cm_id, NULL, 0);
889 break;
890 default:
891 spin_unlock_irq(&cm_id_priv->lock);
892 break;
893 }
894
895 cm_free_id(cm_id->local_id);
896 cm_deref_id(cm_id_priv);
897 wait_for_completion(&cm_id_priv->comp);
898 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
899 cm_free_work(work);
900 kfree(cm_id_priv->private_data);
901 kfree(cm_id_priv);
902 }
903
904 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
905 {
906 cm_destroy_id(cm_id, 0);
907 }
908 EXPORT_SYMBOL(ib_destroy_cm_id);
909
910 /**
911 * __ib_cm_listen - Initiates listening on the specified service ID for
912 * connection and service ID resolution requests.
913 * @cm_id: Connection identifier associated with the listen request.
914 * @service_id: Service identifier matched against incoming connection
915 * and service ID resolution requests. The service ID should be specified
916 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
917 * assign a service ID to the caller.
918 * @service_mask: Mask applied to service ID used to listen across a
919 * range of service IDs. If set to 0, the service ID is matched
920 * exactly. This parameter is ignored if %service_id is set to
921 * IB_CM_ASSIGN_SERVICE_ID.
922 */
923 static int __ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id,
924 __be64 service_mask)
925 {
926 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
927 int ret = 0;
928
929 service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
930 service_id &= service_mask;
931 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
932 (service_id != IB_CM_ASSIGN_SERVICE_ID))
933 return -EINVAL;
934
935 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
936 if (cm_id->state != IB_CM_IDLE)
937 return -EINVAL;
938
939 cm_id->state = IB_CM_LISTEN;
940 ++cm_id_priv->listen_sharecount;
941
942 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
943 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
944 cm_id->service_mask = ~cpu_to_be64(0);
945 } else {
946 cm_id->service_id = service_id;
947 cm_id->service_mask = service_mask;
948 }
949 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
950
951 if (cur_cm_id_priv) {
952 cm_id->state = IB_CM_IDLE;
953 --cm_id_priv->listen_sharecount;
954 ret = -EBUSY;
955 }
956 return ret;
957 }
958
959 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask)
960 {
961 unsigned long flags;
962 int ret;
963
964 spin_lock_irqsave(&cm.lock, flags);
965 ret = __ib_cm_listen(cm_id, service_id, service_mask);
966 spin_unlock_irqrestore(&cm.lock, flags);
967
968 return ret;
969 }
970 EXPORT_SYMBOL(ib_cm_listen);
971
972 /**
973 * Create a new listening ib_cm_id and listen on the given service ID.
974 *
975 * If there's an existing ID listening on that same device and service ID,
976 * return it.
977 *
978 * @device: Device associated with the cm_id. All related communication will
979 * be associated with the specified device.
980 * @cm_handler: Callback invoked to notify the user of CM events.
981 * @service_id: Service identifier matched against incoming connection
982 * and service ID resolution requests. The service ID should be specified
983 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
984 * assign a service ID to the caller.
985 *
986 * Callers should call ib_destroy_cm_id when done with the listener ID.
987 */
988 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device,
989 ib_cm_handler cm_handler,
990 __be64 service_id)
991 {
992 struct cm_id_private *cm_id_priv;
993 struct ib_cm_id *cm_id;
994 unsigned long flags;
995 int err = 0;
996
997 /* Create an ID in advance, since the creation may sleep */
998 cm_id = ib_create_cm_id(device, cm_handler, NULL);
999 if (IS_ERR(cm_id))
1000 return cm_id;
1001
1002 spin_lock_irqsave(&cm.lock, flags);
1003
1004 if (service_id == IB_CM_ASSIGN_SERVICE_ID)
1005 goto new_id;
1006
1007 /* Find an existing ID */
1008 cm_id_priv = cm_find_listen(device, service_id);
1009 if (cm_id_priv) {
1010 if (cm_id->cm_handler != cm_handler || cm_id->context) {
1011 /* Sharing an ib_cm_id with different handlers is not
1012 * supported */
1013 spin_unlock_irqrestore(&cm.lock, flags);
1014 return ERR_PTR(-EINVAL);
1015 }
1016 atomic_inc(&cm_id_priv->refcount);
1017 ++cm_id_priv->listen_sharecount;
1018 spin_unlock_irqrestore(&cm.lock, flags);
1019
1020 ib_destroy_cm_id(cm_id);
1021 cm_id = &cm_id_priv->id;
1022 return cm_id;
1023 }
1024
1025 new_id:
1026 /* Use newly created ID */
1027 err = __ib_cm_listen(cm_id, service_id, 0);
1028
1029 spin_unlock_irqrestore(&cm.lock, flags);
1030
1031 if (err) {
1032 ib_destroy_cm_id(cm_id);
1033 return ERR_PTR(err);
1034 }
1035 return cm_id;
1036 }
1037 EXPORT_SYMBOL(ib_cm_insert_listen);
1038
1039 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
1040 enum cm_msg_sequence msg_seq)
1041 {
1042 u64 hi_tid, low_tid;
1043
1044 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
1045 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
1046 (msg_seq << 30));
1047 return cpu_to_be64(hi_tid | low_tid);
1048 }
1049
1050 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
1051 __be16 attr_id, __be64 tid)
1052 {
1053 hdr->base_version = IB_MGMT_BASE_VERSION;
1054 hdr->mgmt_class = IB_MGMT_CLASS_CM;
1055 hdr->class_version = IB_CM_CLASS_VERSION;
1056 hdr->method = IB_MGMT_METHOD_SEND;
1057 hdr->attr_id = attr_id;
1058 hdr->tid = tid;
1059 }
1060
1061 static void cm_format_req(struct cm_req_msg *req_msg,
1062 struct cm_id_private *cm_id_priv,
1063 struct ib_cm_req_param *param)
1064 {
1065 struct ib_sa_path_rec *pri_path = param->primary_path;
1066 struct ib_sa_path_rec *alt_path = param->alternate_path;
1067
1068 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1069 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
1070
1071 req_msg->local_comm_id = cm_id_priv->id.local_id;
1072 req_msg->service_id = param->service_id;
1073 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1074 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
1075 cm_req_set_init_depth(req_msg, param->initiator_depth);
1076 cm_req_set_remote_resp_timeout(req_msg,
1077 param->remote_cm_response_timeout);
1078 cm_req_set_qp_type(req_msg, param->qp_type);
1079 cm_req_set_flow_ctrl(req_msg, param->flow_control);
1080 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
1081 cm_req_set_local_resp_timeout(req_msg,
1082 param->local_cm_response_timeout);
1083 req_msg->pkey = param->primary_path->pkey;
1084 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
1085 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
1086
1087 if (param->qp_type != IB_QPT_XRC_INI) {
1088 cm_req_set_resp_res(req_msg, param->responder_resources);
1089 cm_req_set_retry_count(req_msg, param->retry_count);
1090 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
1091 cm_req_set_srq(req_msg, param->srq);
1092 }
1093
1094 if (pri_path->hop_limit <= 1) {
1095 req_msg->primary_local_lid = pri_path->slid;
1096 req_msg->primary_remote_lid = pri_path->dlid;
1097 } else {
1098 /* Work-around until there's a way to obtain remote LID info */
1099 req_msg->primary_local_lid = IB_LID_PERMISSIVE;
1100 req_msg->primary_remote_lid = IB_LID_PERMISSIVE;
1101 }
1102 req_msg->primary_local_gid = pri_path->sgid;
1103 req_msg->primary_remote_gid = pri_path->dgid;
1104 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label);
1105 cm_req_set_primary_packet_rate(req_msg, pri_path->rate);
1106 req_msg->primary_traffic_class = pri_path->traffic_class;
1107 req_msg->primary_hop_limit = pri_path->hop_limit;
1108 cm_req_set_primary_sl(req_msg, pri_path->sl);
1109 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1));
1110 cm_req_set_primary_local_ack_timeout(req_msg,
1111 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1112 pri_path->packet_life_time));
1113
1114 if (alt_path) {
1115 if (alt_path->hop_limit <= 1) {
1116 req_msg->alt_local_lid = alt_path->slid;
1117 req_msg->alt_remote_lid = alt_path->dlid;
1118 } else {
1119 req_msg->alt_local_lid = IB_LID_PERMISSIVE;
1120 req_msg->alt_remote_lid = IB_LID_PERMISSIVE;
1121 }
1122 req_msg->alt_local_gid = alt_path->sgid;
1123 req_msg->alt_remote_gid = alt_path->dgid;
1124 cm_req_set_alt_flow_label(req_msg,
1125 alt_path->flow_label);
1126 cm_req_set_alt_packet_rate(req_msg, alt_path->rate);
1127 req_msg->alt_traffic_class = alt_path->traffic_class;
1128 req_msg->alt_hop_limit = alt_path->hop_limit;
1129 cm_req_set_alt_sl(req_msg, alt_path->sl);
1130 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1));
1131 cm_req_set_alt_local_ack_timeout(req_msg,
1132 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1133 alt_path->packet_life_time));
1134 }
1135
1136 if (param->private_data && param->private_data_len)
1137 memcpy(req_msg->private_data, param->private_data,
1138 param->private_data_len);
1139 }
1140
1141 static int cm_validate_req_param(struct ib_cm_req_param *param)
1142 {
1143 /* peer-to-peer not supported */
1144 if (param->peer_to_peer)
1145 return -EINVAL;
1146
1147 if (!param->primary_path)
1148 return -EINVAL;
1149
1150 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
1151 param->qp_type != IB_QPT_XRC_INI)
1152 return -EINVAL;
1153
1154 if (param->private_data &&
1155 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1156 return -EINVAL;
1157
1158 if (param->alternate_path &&
1159 (param->alternate_path->pkey != param->primary_path->pkey ||
1160 param->alternate_path->mtu != param->primary_path->mtu))
1161 return -EINVAL;
1162
1163 return 0;
1164 }
1165
1166 int ib_send_cm_req(struct ib_cm_id *cm_id,
1167 struct ib_cm_req_param *param)
1168 {
1169 struct cm_id_private *cm_id_priv;
1170 struct cm_req_msg *req_msg;
1171 unsigned long flags;
1172 int ret;
1173
1174 ret = cm_validate_req_param(param);
1175 if (ret)
1176 return ret;
1177
1178 /* Verify that we're not in timewait. */
1179 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1180 spin_lock_irqsave(&cm_id_priv->lock, flags);
1181 if (cm_id->state != IB_CM_IDLE) {
1182 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1183 ret = -EINVAL;
1184 goto out;
1185 }
1186 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1187
1188 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1189 id.local_id);
1190 if (IS_ERR(cm_id_priv->timewait_info)) {
1191 ret = PTR_ERR(cm_id_priv->timewait_info);
1192 goto out;
1193 }
1194
1195 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
1196 if (ret)
1197 goto error1;
1198 if (param->alternate_path) {
1199 ret = cm_init_av_by_path(param->alternate_path,
1200 &cm_id_priv->alt_av);
1201 if (ret)
1202 goto error1;
1203 }
1204 cm_id->service_id = param->service_id;
1205 cm_id->service_mask = ~cpu_to_be64(0);
1206 cm_id_priv->timeout_ms = cm_convert_to_ms(
1207 param->primary_path->packet_life_time) * 2 +
1208 cm_convert_to_ms(
1209 param->remote_cm_response_timeout);
1210 cm_id_priv->max_cm_retries = param->max_cm_retries;
1211 cm_id_priv->initiator_depth = param->initiator_depth;
1212 cm_id_priv->responder_resources = param->responder_resources;
1213 cm_id_priv->retry_count = param->retry_count;
1214 cm_id_priv->path_mtu = param->primary_path->mtu;
1215 cm_id_priv->pkey = param->primary_path->pkey;
1216 cm_id_priv->qp_type = param->qp_type;
1217
1218 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1219 if (ret)
1220 goto error1;
1221
1222 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1223 cm_format_req(req_msg, cm_id_priv, param);
1224 cm_id_priv->tid = req_msg->hdr.tid;
1225 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1226 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1227
1228 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1229 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1230
1231 spin_lock_irqsave(&cm_id_priv->lock, flags);
1232 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1233 if (ret) {
1234 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1235 goto error2;
1236 }
1237 BUG_ON(cm_id->state != IB_CM_IDLE);
1238 cm_id->state = IB_CM_REQ_SENT;
1239 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1240 return 0;
1241
1242 error2: cm_free_msg(cm_id_priv->msg);
1243 error1: kfree(cm_id_priv->timewait_info);
1244 out: return ret;
1245 }
1246 EXPORT_SYMBOL(ib_send_cm_req);
1247
1248 static int cm_issue_rej(struct cm_port *port,
1249 struct ib_mad_recv_wc *mad_recv_wc,
1250 enum ib_cm_rej_reason reason,
1251 enum cm_msg_response msg_rejected,
1252 void *ari, u8 ari_length)
1253 {
1254 struct ib_mad_send_buf *msg = NULL;
1255 struct cm_rej_msg *rej_msg, *rcv_msg;
1256 int ret;
1257
1258 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1259 if (ret)
1260 return ret;
1261
1262 /* We just need common CM header information. Cast to any message. */
1263 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1264 rej_msg = (struct cm_rej_msg *) msg->mad;
1265
1266 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1267 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1268 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1269 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1270 rej_msg->reason = cpu_to_be16(reason);
1271
1272 if (ari && ari_length) {
1273 cm_rej_set_reject_info_len(rej_msg, ari_length);
1274 memcpy(rej_msg->ari, ari, ari_length);
1275 }
1276
1277 ret = ib_post_send_mad(msg, NULL);
1278 if (ret)
1279 cm_free_msg(msg);
1280
1281 return ret;
1282 }
1283
1284 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1285 __be32 local_qpn, __be32 remote_qpn)
1286 {
1287 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1288 ((local_ca_guid == remote_ca_guid) &&
1289 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1290 }
1291
1292 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1293 struct ib_sa_path_rec *primary_path,
1294 struct ib_sa_path_rec *alt_path)
1295 {
1296 memset(primary_path, 0, sizeof *primary_path);
1297 primary_path->dgid = req_msg->primary_local_gid;
1298 primary_path->sgid = req_msg->primary_remote_gid;
1299 primary_path->dlid = req_msg->primary_local_lid;
1300 primary_path->slid = req_msg->primary_remote_lid;
1301 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1302 primary_path->hop_limit = req_msg->primary_hop_limit;
1303 primary_path->traffic_class = req_msg->primary_traffic_class;
1304 primary_path->reversible = 1;
1305 primary_path->pkey = req_msg->pkey;
1306 primary_path->sl = cm_req_get_primary_sl(req_msg);
1307 primary_path->mtu_selector = IB_SA_EQ;
1308 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1309 primary_path->rate_selector = IB_SA_EQ;
1310 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1311 primary_path->packet_life_time_selector = IB_SA_EQ;
1312 primary_path->packet_life_time =
1313 cm_req_get_primary_local_ack_timeout(req_msg);
1314 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1315 primary_path->service_id = req_msg->service_id;
1316
1317 if (req_msg->alt_local_lid) {
1318 memset(alt_path, 0, sizeof *alt_path);
1319 alt_path->dgid = req_msg->alt_local_gid;
1320 alt_path->sgid = req_msg->alt_remote_gid;
1321 alt_path->dlid = req_msg->alt_local_lid;
1322 alt_path->slid = req_msg->alt_remote_lid;
1323 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1324 alt_path->hop_limit = req_msg->alt_hop_limit;
1325 alt_path->traffic_class = req_msg->alt_traffic_class;
1326 alt_path->reversible = 1;
1327 alt_path->pkey = req_msg->pkey;
1328 alt_path->sl = cm_req_get_alt_sl(req_msg);
1329 alt_path->mtu_selector = IB_SA_EQ;
1330 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1331 alt_path->rate_selector = IB_SA_EQ;
1332 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1333 alt_path->packet_life_time_selector = IB_SA_EQ;
1334 alt_path->packet_life_time =
1335 cm_req_get_alt_local_ack_timeout(req_msg);
1336 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1337 alt_path->service_id = req_msg->service_id;
1338 }
1339 }
1340
1341 static u16 cm_get_bth_pkey(struct cm_work *work)
1342 {
1343 struct ib_device *ib_dev = work->port->cm_dev->ib_device;
1344 u8 port_num = work->port->port_num;
1345 u16 pkey_index = work->mad_recv_wc->wc->pkey_index;
1346 u16 pkey;
1347 int ret;
1348
1349 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey);
1350 if (ret) {
1351 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n",
1352 port_num, pkey_index, ret);
1353 return 0;
1354 }
1355
1356 return pkey;
1357 }
1358
1359 static void cm_format_req_event(struct cm_work *work,
1360 struct cm_id_private *cm_id_priv,
1361 struct ib_cm_id *listen_id)
1362 {
1363 struct cm_req_msg *req_msg;
1364 struct ib_cm_req_event_param *param;
1365
1366 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1367 param = &work->cm_event.param.req_rcvd;
1368 param->listen_id = listen_id;
1369 param->bth_pkey = cm_get_bth_pkey(work);
1370 param->port = cm_id_priv->av.port->port_num;
1371 param->primary_path = &work->path[0];
1372 if (req_msg->alt_local_lid)
1373 param->alternate_path = &work->path[1];
1374 else
1375 param->alternate_path = NULL;
1376 param->remote_ca_guid = req_msg->local_ca_guid;
1377 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1378 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1379 param->qp_type = cm_req_get_qp_type(req_msg);
1380 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1381 param->responder_resources = cm_req_get_init_depth(req_msg);
1382 param->initiator_depth = cm_req_get_resp_res(req_msg);
1383 param->local_cm_response_timeout =
1384 cm_req_get_remote_resp_timeout(req_msg);
1385 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1386 param->remote_cm_response_timeout =
1387 cm_req_get_local_resp_timeout(req_msg);
1388 param->retry_count = cm_req_get_retry_count(req_msg);
1389 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1390 param->srq = cm_req_get_srq(req_msg);
1391 work->cm_event.private_data = &req_msg->private_data;
1392 }
1393
1394 static void cm_process_work(struct cm_id_private *cm_id_priv,
1395 struct cm_work *work)
1396 {
1397 int ret;
1398
1399 /* We will typically only have the current event to report. */
1400 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1401 cm_free_work(work);
1402
1403 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1404 spin_lock_irq(&cm_id_priv->lock);
1405 work = cm_dequeue_work(cm_id_priv);
1406 spin_unlock_irq(&cm_id_priv->lock);
1407 BUG_ON(!work);
1408 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1409 &work->cm_event);
1410 cm_free_work(work);
1411 }
1412 cm_deref_id(cm_id_priv);
1413 if (ret)
1414 cm_destroy_id(&cm_id_priv->id, ret);
1415 }
1416
1417 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1418 struct cm_id_private *cm_id_priv,
1419 enum cm_msg_response msg_mraed, u8 service_timeout,
1420 const void *private_data, u8 private_data_len)
1421 {
1422 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1423 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1424 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1425 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1426 cm_mra_set_service_timeout(mra_msg, service_timeout);
1427
1428 if (private_data && private_data_len)
1429 memcpy(mra_msg->private_data, private_data, private_data_len);
1430 }
1431
1432 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1433 struct cm_id_private *cm_id_priv,
1434 enum ib_cm_rej_reason reason,
1435 void *ari,
1436 u8 ari_length,
1437 const void *private_data,
1438 u8 private_data_len)
1439 {
1440 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1441 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1442
1443 switch(cm_id_priv->id.state) {
1444 case IB_CM_REQ_RCVD:
1445 rej_msg->local_comm_id = 0;
1446 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1447 break;
1448 case IB_CM_MRA_REQ_SENT:
1449 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1450 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1451 break;
1452 case IB_CM_REP_RCVD:
1453 case IB_CM_MRA_REP_SENT:
1454 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1455 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1456 break;
1457 default:
1458 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1459 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1460 break;
1461 }
1462
1463 rej_msg->reason = cpu_to_be16(reason);
1464 if (ari && ari_length) {
1465 cm_rej_set_reject_info_len(rej_msg, ari_length);
1466 memcpy(rej_msg->ari, ari, ari_length);
1467 }
1468
1469 if (private_data && private_data_len)
1470 memcpy(rej_msg->private_data, private_data, private_data_len);
1471 }
1472
1473 static void cm_dup_req_handler(struct cm_work *work,
1474 struct cm_id_private *cm_id_priv)
1475 {
1476 struct ib_mad_send_buf *msg = NULL;
1477 int ret;
1478
1479 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1480 counter[CM_REQ_COUNTER]);
1481
1482 /* Quick state check to discard duplicate REQs. */
1483 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1484 return;
1485
1486 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1487 if (ret)
1488 return;
1489
1490 spin_lock_irq(&cm_id_priv->lock);
1491 switch (cm_id_priv->id.state) {
1492 case IB_CM_MRA_REQ_SENT:
1493 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1494 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1495 cm_id_priv->private_data,
1496 cm_id_priv->private_data_len);
1497 break;
1498 case IB_CM_TIMEWAIT:
1499 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1500 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1501 break;
1502 default:
1503 goto unlock;
1504 }
1505 spin_unlock_irq(&cm_id_priv->lock);
1506
1507 ret = ib_post_send_mad(msg, NULL);
1508 if (ret)
1509 goto free;
1510 return;
1511
1512 unlock: spin_unlock_irq(&cm_id_priv->lock);
1513 free: cm_free_msg(msg);
1514 }
1515
1516 static struct cm_id_private * cm_match_req(struct cm_work *work,
1517 struct cm_id_private *cm_id_priv)
1518 {
1519 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1520 struct cm_timewait_info *timewait_info;
1521 struct cm_req_msg *req_msg;
1522
1523 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1524
1525 /* Check for possible duplicate REQ. */
1526 spin_lock_irq(&cm.lock);
1527 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1528 if (timewait_info) {
1529 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1530 timewait_info->work.remote_id);
1531 spin_unlock_irq(&cm.lock);
1532 if (cur_cm_id_priv) {
1533 cm_dup_req_handler(work, cur_cm_id_priv);
1534 cm_deref_id(cur_cm_id_priv);
1535 }
1536 return NULL;
1537 }
1538
1539 /* Check for stale connections. */
1540 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1541 if (timewait_info) {
1542 cm_cleanup_timewait(cm_id_priv->timewait_info);
1543 spin_unlock_irq(&cm.lock);
1544 cm_issue_rej(work->port, work->mad_recv_wc,
1545 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1546 NULL, 0);
1547 return NULL;
1548 }
1549
1550 /* Find matching listen request. */
1551 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1552 req_msg->service_id);
1553 if (!listen_cm_id_priv) {
1554 cm_cleanup_timewait(cm_id_priv->timewait_info);
1555 spin_unlock_irq(&cm.lock);
1556 cm_issue_rej(work->port, work->mad_recv_wc,
1557 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1558 NULL, 0);
1559 goto out;
1560 }
1561 atomic_inc(&listen_cm_id_priv->refcount);
1562 atomic_inc(&cm_id_priv->refcount);
1563 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1564 atomic_inc(&cm_id_priv->work_count);
1565 spin_unlock_irq(&cm.lock);
1566 out:
1567 return listen_cm_id_priv;
1568 }
1569
1570 /*
1571 * Work-around for inter-subnet connections. If the LIDs are permissive,
1572 * we need to override the LID/SL data in the REQ with the LID information
1573 * in the work completion.
1574 */
1575 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
1576 {
1577 if (!cm_req_get_primary_subnet_local(req_msg)) {
1578 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) {
1579 req_msg->primary_local_lid = cpu_to_be16(wc->slid);
1580 cm_req_set_primary_sl(req_msg, wc->sl);
1581 }
1582
1583 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE)
1584 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1585 }
1586
1587 if (!cm_req_get_alt_subnet_local(req_msg)) {
1588 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) {
1589 req_msg->alt_local_lid = cpu_to_be16(wc->slid);
1590 cm_req_set_alt_sl(req_msg, wc->sl);
1591 }
1592
1593 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE)
1594 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1595 }
1596 }
1597
1598 static int cm_req_handler(struct cm_work *work)
1599 {
1600 struct ib_cm_id *cm_id;
1601 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1602 struct cm_req_msg *req_msg;
1603 int ret;
1604
1605 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1606
1607 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
1608 if (IS_ERR(cm_id))
1609 return PTR_ERR(cm_id);
1610
1611 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1612 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1613 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1614 work->mad_recv_wc->recv_buf.grh,
1615 &cm_id_priv->av);
1616 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1617 id.local_id);
1618 if (IS_ERR(cm_id_priv->timewait_info)) {
1619 ret = PTR_ERR(cm_id_priv->timewait_info);
1620 goto destroy;
1621 }
1622 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1623 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1624 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1625
1626 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1627 if (!listen_cm_id_priv) {
1628 ret = -EINVAL;
1629 kfree(cm_id_priv->timewait_info);
1630 goto destroy;
1631 }
1632
1633 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1634 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1635 cm_id_priv->id.service_id = req_msg->service_id;
1636 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
1637
1638 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
1639 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1640
1641 memcpy(work->path[0].dmac, cm_id_priv->av.ah_attr.dmac, ETH_ALEN);
1642 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1643 if (ret) {
1644 ib_get_cached_gid(work->port->cm_dev->ib_device,
1645 work->port->port_num, 0, &work->path[0].sgid,
1646 NULL);
1647 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1648 &work->path[0].sgid, sizeof work->path[0].sgid,
1649 NULL, 0);
1650 goto rejected;
1651 }
1652 if (req_msg->alt_local_lid) {
1653 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1654 if (ret) {
1655 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1656 &work->path[0].sgid,
1657 sizeof work->path[0].sgid, NULL, 0);
1658 goto rejected;
1659 }
1660 }
1661 cm_id_priv->tid = req_msg->hdr.tid;
1662 cm_id_priv->timeout_ms = cm_convert_to_ms(
1663 cm_req_get_local_resp_timeout(req_msg));
1664 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1665 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1666 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1667 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1668 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1669 cm_id_priv->pkey = req_msg->pkey;
1670 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1671 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1672 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1673 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1674
1675 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1676 cm_process_work(cm_id_priv, work);
1677 cm_deref_id(listen_cm_id_priv);
1678 return 0;
1679
1680 rejected:
1681 atomic_dec(&cm_id_priv->refcount);
1682 cm_deref_id(listen_cm_id_priv);
1683 destroy:
1684 ib_destroy_cm_id(cm_id);
1685 return ret;
1686 }
1687
1688 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1689 struct cm_id_private *cm_id_priv,
1690 struct ib_cm_rep_param *param)
1691 {
1692 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1693 rep_msg->local_comm_id = cm_id_priv->id.local_id;
1694 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1695 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1696 rep_msg->resp_resources = param->responder_resources;
1697 cm_rep_set_target_ack_delay(rep_msg,
1698 cm_id_priv->av.port->cm_dev->ack_delay);
1699 cm_rep_set_failover(rep_msg, param->failover_accepted);
1700 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1701 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1702
1703 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
1704 rep_msg->initiator_depth = param->initiator_depth;
1705 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1706 cm_rep_set_srq(rep_msg, param->srq);
1707 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1708 } else {
1709 cm_rep_set_srq(rep_msg, 1);
1710 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num));
1711 }
1712
1713 if (param->private_data && param->private_data_len)
1714 memcpy(rep_msg->private_data, param->private_data,
1715 param->private_data_len);
1716 }
1717
1718 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1719 struct ib_cm_rep_param *param)
1720 {
1721 struct cm_id_private *cm_id_priv;
1722 struct ib_mad_send_buf *msg;
1723 struct cm_rep_msg *rep_msg;
1724 unsigned long flags;
1725 int ret;
1726
1727 if (param->private_data &&
1728 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1729 return -EINVAL;
1730
1731 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1732 spin_lock_irqsave(&cm_id_priv->lock, flags);
1733 if (cm_id->state != IB_CM_REQ_RCVD &&
1734 cm_id->state != IB_CM_MRA_REQ_SENT) {
1735 ret = -EINVAL;
1736 goto out;
1737 }
1738
1739 ret = cm_alloc_msg(cm_id_priv, &msg);
1740 if (ret)
1741 goto out;
1742
1743 rep_msg = (struct cm_rep_msg *) msg->mad;
1744 cm_format_rep(rep_msg, cm_id_priv, param);
1745 msg->timeout_ms = cm_id_priv->timeout_ms;
1746 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1747
1748 ret = ib_post_send_mad(msg, NULL);
1749 if (ret) {
1750 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1751 cm_free_msg(msg);
1752 return ret;
1753 }
1754
1755 cm_id->state = IB_CM_REP_SENT;
1756 cm_id_priv->msg = msg;
1757 cm_id_priv->initiator_depth = param->initiator_depth;
1758 cm_id_priv->responder_resources = param->responder_resources;
1759 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1760 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
1761
1762 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1763 return ret;
1764 }
1765 EXPORT_SYMBOL(ib_send_cm_rep);
1766
1767 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1768 struct cm_id_private *cm_id_priv,
1769 const void *private_data,
1770 u8 private_data_len)
1771 {
1772 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1773 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1774 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1775
1776 if (private_data && private_data_len)
1777 memcpy(rtu_msg->private_data, private_data, private_data_len);
1778 }
1779
1780 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1781 const void *private_data,
1782 u8 private_data_len)
1783 {
1784 struct cm_id_private *cm_id_priv;
1785 struct ib_mad_send_buf *msg;
1786 unsigned long flags;
1787 void *data;
1788 int ret;
1789
1790 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1791 return -EINVAL;
1792
1793 data = cm_copy_private_data(private_data, private_data_len);
1794 if (IS_ERR(data))
1795 return PTR_ERR(data);
1796
1797 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1798 spin_lock_irqsave(&cm_id_priv->lock, flags);
1799 if (cm_id->state != IB_CM_REP_RCVD &&
1800 cm_id->state != IB_CM_MRA_REP_SENT) {
1801 ret = -EINVAL;
1802 goto error;
1803 }
1804
1805 ret = cm_alloc_msg(cm_id_priv, &msg);
1806 if (ret)
1807 goto error;
1808
1809 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1810 private_data, private_data_len);
1811
1812 ret = ib_post_send_mad(msg, NULL);
1813 if (ret) {
1814 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1815 cm_free_msg(msg);
1816 kfree(data);
1817 return ret;
1818 }
1819
1820 cm_id->state = IB_CM_ESTABLISHED;
1821 cm_set_private_data(cm_id_priv, data, private_data_len);
1822 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1823 return 0;
1824
1825 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1826 kfree(data);
1827 return ret;
1828 }
1829 EXPORT_SYMBOL(ib_send_cm_rtu);
1830
1831 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
1832 {
1833 struct cm_rep_msg *rep_msg;
1834 struct ib_cm_rep_event_param *param;
1835
1836 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1837 param = &work->cm_event.param.rep_rcvd;
1838 param->remote_ca_guid = rep_msg->local_ca_guid;
1839 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1840 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
1841 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1842 param->responder_resources = rep_msg->initiator_depth;
1843 param->initiator_depth = rep_msg->resp_resources;
1844 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1845 param->failover_accepted = cm_rep_get_failover(rep_msg);
1846 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1847 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1848 param->srq = cm_rep_get_srq(rep_msg);
1849 work->cm_event.private_data = &rep_msg->private_data;
1850 }
1851
1852 static void cm_dup_rep_handler(struct cm_work *work)
1853 {
1854 struct cm_id_private *cm_id_priv;
1855 struct cm_rep_msg *rep_msg;
1856 struct ib_mad_send_buf *msg = NULL;
1857 int ret;
1858
1859 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1860 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1861 rep_msg->local_comm_id);
1862 if (!cm_id_priv)
1863 return;
1864
1865 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1866 counter[CM_REP_COUNTER]);
1867 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1868 if (ret)
1869 goto deref;
1870
1871 spin_lock_irq(&cm_id_priv->lock);
1872 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1873 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1874 cm_id_priv->private_data,
1875 cm_id_priv->private_data_len);
1876 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1877 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1878 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1879 cm_id_priv->private_data,
1880 cm_id_priv->private_data_len);
1881 else
1882 goto unlock;
1883 spin_unlock_irq(&cm_id_priv->lock);
1884
1885 ret = ib_post_send_mad(msg, NULL);
1886 if (ret)
1887 goto free;
1888 goto deref;
1889
1890 unlock: spin_unlock_irq(&cm_id_priv->lock);
1891 free: cm_free_msg(msg);
1892 deref: cm_deref_id(cm_id_priv);
1893 }
1894
1895 static int cm_rep_handler(struct cm_work *work)
1896 {
1897 struct cm_id_private *cm_id_priv;
1898 struct cm_rep_msg *rep_msg;
1899 int ret;
1900
1901 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1902 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1903 if (!cm_id_priv) {
1904 cm_dup_rep_handler(work);
1905 return -EINVAL;
1906 }
1907
1908 cm_format_rep_event(work, cm_id_priv->qp_type);
1909
1910 spin_lock_irq(&cm_id_priv->lock);
1911 switch (cm_id_priv->id.state) {
1912 case IB_CM_REQ_SENT:
1913 case IB_CM_MRA_REQ_RCVD:
1914 break;
1915 default:
1916 spin_unlock_irq(&cm_id_priv->lock);
1917 ret = -EINVAL;
1918 goto error;
1919 }
1920
1921 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1922 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1923 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
1924
1925 spin_lock(&cm.lock);
1926 /* Check for duplicate REP. */
1927 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1928 spin_unlock(&cm.lock);
1929 spin_unlock_irq(&cm_id_priv->lock);
1930 ret = -EINVAL;
1931 goto error;
1932 }
1933 /* Check for a stale connection. */
1934 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1935 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1936 &cm.remote_id_table);
1937 cm_id_priv->timewait_info->inserted_remote_id = 0;
1938 spin_unlock(&cm.lock);
1939 spin_unlock_irq(&cm_id_priv->lock);
1940 cm_issue_rej(work->port, work->mad_recv_wc,
1941 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1942 NULL, 0);
1943 ret = -EINVAL;
1944 goto error;
1945 }
1946 spin_unlock(&cm.lock);
1947
1948 cm_id_priv->id.state = IB_CM_REP_RCVD;
1949 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1950 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
1951 cm_id_priv->initiator_depth = rep_msg->resp_resources;
1952 cm_id_priv->responder_resources = rep_msg->initiator_depth;
1953 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1954 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1955 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1956 cm_id_priv->av.timeout =
1957 cm_ack_timeout(cm_id_priv->target_ack_delay,
1958 cm_id_priv->av.timeout - 1);
1959 cm_id_priv->alt_av.timeout =
1960 cm_ack_timeout(cm_id_priv->target_ack_delay,
1961 cm_id_priv->alt_av.timeout - 1);
1962
1963 /* todo: handle peer_to_peer */
1964
1965 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1966 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1967 if (!ret)
1968 list_add_tail(&work->list, &cm_id_priv->work_list);
1969 spin_unlock_irq(&cm_id_priv->lock);
1970
1971 if (ret)
1972 cm_process_work(cm_id_priv, work);
1973 else
1974 cm_deref_id(cm_id_priv);
1975 return 0;
1976
1977 error:
1978 cm_deref_id(cm_id_priv);
1979 return ret;
1980 }
1981
1982 static int cm_establish_handler(struct cm_work *work)
1983 {
1984 struct cm_id_private *cm_id_priv;
1985 int ret;
1986
1987 /* See comment in cm_establish about lookup. */
1988 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1989 if (!cm_id_priv)
1990 return -EINVAL;
1991
1992 spin_lock_irq(&cm_id_priv->lock);
1993 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1994 spin_unlock_irq(&cm_id_priv->lock);
1995 goto out;
1996 }
1997
1998 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1999 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2000 if (!ret)
2001 list_add_tail(&work->list, &cm_id_priv->work_list);
2002 spin_unlock_irq(&cm_id_priv->lock);
2003
2004 if (ret)
2005 cm_process_work(cm_id_priv, work);
2006 else
2007 cm_deref_id(cm_id_priv);
2008 return 0;
2009 out:
2010 cm_deref_id(cm_id_priv);
2011 return -EINVAL;
2012 }
2013
2014 static int cm_rtu_handler(struct cm_work *work)
2015 {
2016 struct cm_id_private *cm_id_priv;
2017 struct cm_rtu_msg *rtu_msg;
2018 int ret;
2019
2020 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
2021 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
2022 rtu_msg->local_comm_id);
2023 if (!cm_id_priv)
2024 return -EINVAL;
2025
2026 work->cm_event.private_data = &rtu_msg->private_data;
2027
2028 spin_lock_irq(&cm_id_priv->lock);
2029 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
2030 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
2031 spin_unlock_irq(&cm_id_priv->lock);
2032 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2033 counter[CM_RTU_COUNTER]);
2034 goto out;
2035 }
2036 cm_id_priv->id.state = IB_CM_ESTABLISHED;
2037
2038 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2039 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2040 if (!ret)
2041 list_add_tail(&work->list, &cm_id_priv->work_list);
2042 spin_unlock_irq(&cm_id_priv->lock);
2043
2044 if (ret)
2045 cm_process_work(cm_id_priv, work);
2046 else
2047 cm_deref_id(cm_id_priv);
2048 return 0;
2049 out:
2050 cm_deref_id(cm_id_priv);
2051 return -EINVAL;
2052 }
2053
2054 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
2055 struct cm_id_private *cm_id_priv,
2056 const void *private_data,
2057 u8 private_data_len)
2058 {
2059 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
2060 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
2061 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
2062 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
2063 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
2064
2065 if (private_data && private_data_len)
2066 memcpy(dreq_msg->private_data, private_data, private_data_len);
2067 }
2068
2069 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
2070 const void *private_data,
2071 u8 private_data_len)
2072 {
2073 struct cm_id_private *cm_id_priv;
2074 struct ib_mad_send_buf *msg;
2075 unsigned long flags;
2076 int ret;
2077
2078 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
2079 return -EINVAL;
2080
2081 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2082 spin_lock_irqsave(&cm_id_priv->lock, flags);
2083 if (cm_id->state != IB_CM_ESTABLISHED) {
2084 ret = -EINVAL;
2085 goto out;
2086 }
2087
2088 if (cm_id->lap_state == IB_CM_LAP_SENT ||
2089 cm_id->lap_state == IB_CM_MRA_LAP_RCVD)
2090 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2091
2092 ret = cm_alloc_msg(cm_id_priv, &msg);
2093 if (ret) {
2094 cm_enter_timewait(cm_id_priv);
2095 goto out;
2096 }
2097
2098 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2099 private_data, private_data_len);
2100 msg->timeout_ms = cm_id_priv->timeout_ms;
2101 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2102
2103 ret = ib_post_send_mad(msg, NULL);
2104 if (ret) {
2105 cm_enter_timewait(cm_id_priv);
2106 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2107 cm_free_msg(msg);
2108 return ret;
2109 }
2110
2111 cm_id->state = IB_CM_DREQ_SENT;
2112 cm_id_priv->msg = msg;
2113 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2114 return ret;
2115 }
2116 EXPORT_SYMBOL(ib_send_cm_dreq);
2117
2118 static void cm_format_drep(struct cm_drep_msg *drep_msg,
2119 struct cm_id_private *cm_id_priv,
2120 const void *private_data,
2121 u8 private_data_len)
2122 {
2123 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2124 drep_msg->local_comm_id = cm_id_priv->id.local_id;
2125 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
2126
2127 if (private_data && private_data_len)
2128 memcpy(drep_msg->private_data, private_data, private_data_len);
2129 }
2130
2131 int ib_send_cm_drep(struct ib_cm_id *cm_id,
2132 const void *private_data,
2133 u8 private_data_len)
2134 {
2135 struct cm_id_private *cm_id_priv;
2136 struct ib_mad_send_buf *msg;
2137 unsigned long flags;
2138 void *data;
2139 int ret;
2140
2141 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2142 return -EINVAL;
2143
2144 data = cm_copy_private_data(private_data, private_data_len);
2145 if (IS_ERR(data))
2146 return PTR_ERR(data);
2147
2148 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2149 spin_lock_irqsave(&cm_id_priv->lock, flags);
2150 if (cm_id->state != IB_CM_DREQ_RCVD) {
2151 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2152 kfree(data);
2153 return -EINVAL;
2154 }
2155
2156 cm_set_private_data(cm_id_priv, data, private_data_len);
2157 cm_enter_timewait(cm_id_priv);
2158
2159 ret = cm_alloc_msg(cm_id_priv, &msg);
2160 if (ret)
2161 goto out;
2162
2163 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2164 private_data, private_data_len);
2165
2166 ret = ib_post_send_mad(msg, NULL);
2167 if (ret) {
2168 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2169 cm_free_msg(msg);
2170 return ret;
2171 }
2172
2173 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2174 return ret;
2175 }
2176 EXPORT_SYMBOL(ib_send_cm_drep);
2177
2178 static int cm_issue_drep(struct cm_port *port,
2179 struct ib_mad_recv_wc *mad_recv_wc)
2180 {
2181 struct ib_mad_send_buf *msg = NULL;
2182 struct cm_dreq_msg *dreq_msg;
2183 struct cm_drep_msg *drep_msg;
2184 int ret;
2185
2186 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2187 if (ret)
2188 return ret;
2189
2190 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2191 drep_msg = (struct cm_drep_msg *) msg->mad;
2192
2193 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2194 drep_msg->remote_comm_id = dreq_msg->local_comm_id;
2195 drep_msg->local_comm_id = dreq_msg->remote_comm_id;
2196
2197 ret = ib_post_send_mad(msg, NULL);
2198 if (ret)
2199 cm_free_msg(msg);
2200
2201 return ret;
2202 }
2203
2204 static int cm_dreq_handler(struct cm_work *work)
2205 {
2206 struct cm_id_private *cm_id_priv;
2207 struct cm_dreq_msg *dreq_msg;
2208 struct ib_mad_send_buf *msg = NULL;
2209 int ret;
2210
2211 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2212 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
2213 dreq_msg->local_comm_id);
2214 if (!cm_id_priv) {
2215 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2216 counter[CM_DREQ_COUNTER]);
2217 cm_issue_drep(work->port, work->mad_recv_wc);
2218 return -EINVAL;
2219 }
2220
2221 work->cm_event.private_data = &dreq_msg->private_data;
2222
2223 spin_lock_irq(&cm_id_priv->lock);
2224 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
2225 goto unlock;
2226
2227 switch (cm_id_priv->id.state) {
2228 case IB_CM_REP_SENT:
2229 case IB_CM_DREQ_SENT:
2230 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2231 break;
2232 case IB_CM_ESTABLISHED:
2233 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2234 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2235 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2236 break;
2237 case IB_CM_MRA_REP_RCVD:
2238 break;
2239 case IB_CM_TIMEWAIT:
2240 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2241 counter[CM_DREQ_COUNTER]);
2242 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2243 goto unlock;
2244
2245 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2246 cm_id_priv->private_data,
2247 cm_id_priv->private_data_len);
2248 spin_unlock_irq(&cm_id_priv->lock);
2249
2250 if (ib_post_send_mad(msg, NULL))
2251 cm_free_msg(msg);
2252 goto deref;
2253 case IB_CM_DREQ_RCVD:
2254 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2255 counter[CM_DREQ_COUNTER]);
2256 goto unlock;
2257 default:
2258 goto unlock;
2259 }
2260 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2261 cm_id_priv->tid = dreq_msg->hdr.tid;
2262 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2263 if (!ret)
2264 list_add_tail(&work->list, &cm_id_priv->work_list);
2265 spin_unlock_irq(&cm_id_priv->lock);
2266
2267 if (ret)
2268 cm_process_work(cm_id_priv, work);
2269 else
2270 cm_deref_id(cm_id_priv);
2271 return 0;
2272
2273 unlock: spin_unlock_irq(&cm_id_priv->lock);
2274 deref: cm_deref_id(cm_id_priv);
2275 return -EINVAL;
2276 }
2277
2278 static int cm_drep_handler(struct cm_work *work)
2279 {
2280 struct cm_id_private *cm_id_priv;
2281 struct cm_drep_msg *drep_msg;
2282 int ret;
2283
2284 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2285 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2286 drep_msg->local_comm_id);
2287 if (!cm_id_priv)
2288 return -EINVAL;
2289
2290 work->cm_event.private_data = &drep_msg->private_data;
2291
2292 spin_lock_irq(&cm_id_priv->lock);
2293 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2294 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2295 spin_unlock_irq(&cm_id_priv->lock);
2296 goto out;
2297 }
2298 cm_enter_timewait(cm_id_priv);
2299
2300 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2301 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2302 if (!ret)
2303 list_add_tail(&work->list, &cm_id_priv->work_list);
2304 spin_unlock_irq(&cm_id_priv->lock);
2305
2306 if (ret)
2307 cm_process_work(cm_id_priv, work);
2308 else
2309 cm_deref_id(cm_id_priv);
2310 return 0;
2311 out:
2312 cm_deref_id(cm_id_priv);
2313 return -EINVAL;
2314 }
2315
2316 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2317 enum ib_cm_rej_reason reason,
2318 void *ari,
2319 u8 ari_length,
2320 const void *private_data,
2321 u8 private_data_len)
2322 {
2323 struct cm_id_private *cm_id_priv;
2324 struct ib_mad_send_buf *msg;
2325 unsigned long flags;
2326 int ret;
2327
2328 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2329 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2330 return -EINVAL;
2331
2332 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2333
2334 spin_lock_irqsave(&cm_id_priv->lock, flags);
2335 switch (cm_id->state) {
2336 case IB_CM_REQ_SENT:
2337 case IB_CM_MRA_REQ_RCVD:
2338 case IB_CM_REQ_RCVD:
2339 case IB_CM_MRA_REQ_SENT:
2340 case IB_CM_REP_RCVD:
2341 case IB_CM_MRA_REP_SENT:
2342 ret = cm_alloc_msg(cm_id_priv, &msg);
2343 if (!ret)
2344 cm_format_rej((struct cm_rej_msg *) msg->mad,
2345 cm_id_priv, reason, ari, ari_length,
2346 private_data, private_data_len);
2347
2348 cm_reset_to_idle(cm_id_priv);
2349 break;
2350 case IB_CM_REP_SENT:
2351 case IB_CM_MRA_REP_RCVD:
2352 ret = cm_alloc_msg(cm_id_priv, &msg);
2353 if (!ret)
2354 cm_format_rej((struct cm_rej_msg *) msg->mad,
2355 cm_id_priv, reason, ari, ari_length,
2356 private_data, private_data_len);
2357
2358 cm_enter_timewait(cm_id_priv);
2359 break;
2360 default:
2361 ret = -EINVAL;
2362 goto out;
2363 }
2364
2365 if (ret)
2366 goto out;
2367
2368 ret = ib_post_send_mad(msg, NULL);
2369 if (ret)
2370 cm_free_msg(msg);
2371
2372 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2373 return ret;
2374 }
2375 EXPORT_SYMBOL(ib_send_cm_rej);
2376
2377 static void cm_format_rej_event(struct cm_work *work)
2378 {
2379 struct cm_rej_msg *rej_msg;
2380 struct ib_cm_rej_event_param *param;
2381
2382 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2383 param = &work->cm_event.param.rej_rcvd;
2384 param->ari = rej_msg->ari;
2385 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2386 param->reason = __be16_to_cpu(rej_msg->reason);
2387 work->cm_event.private_data = &rej_msg->private_data;
2388 }
2389
2390 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2391 {
2392 struct cm_timewait_info *timewait_info;
2393 struct cm_id_private *cm_id_priv;
2394 __be32 remote_id;
2395
2396 remote_id = rej_msg->local_comm_id;
2397
2398 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2399 spin_lock_irq(&cm.lock);
2400 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2401 remote_id);
2402 if (!timewait_info) {
2403 spin_unlock_irq(&cm.lock);
2404 return NULL;
2405 }
2406 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2407 (timewait_info->work.local_id ^
2408 cm.random_id_operand));
2409 if (cm_id_priv) {
2410 if (cm_id_priv->id.remote_id == remote_id)
2411 atomic_inc(&cm_id_priv->refcount);
2412 else
2413 cm_id_priv = NULL;
2414 }
2415 spin_unlock_irq(&cm.lock);
2416 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2417 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2418 else
2419 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2420
2421 return cm_id_priv;
2422 }
2423
2424 static int cm_rej_handler(struct cm_work *work)
2425 {
2426 struct cm_id_private *cm_id_priv;
2427 struct cm_rej_msg *rej_msg;
2428 int ret;
2429
2430 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2431 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2432 if (!cm_id_priv)
2433 return -EINVAL;
2434
2435 cm_format_rej_event(work);
2436
2437 spin_lock_irq(&cm_id_priv->lock);
2438 switch (cm_id_priv->id.state) {
2439 case IB_CM_REQ_SENT:
2440 case IB_CM_MRA_REQ_RCVD:
2441 case IB_CM_REP_SENT:
2442 case IB_CM_MRA_REP_RCVD:
2443 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2444 /* fall through */
2445 case IB_CM_REQ_RCVD:
2446 case IB_CM_MRA_REQ_SENT:
2447 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2448 cm_enter_timewait(cm_id_priv);
2449 else
2450 cm_reset_to_idle(cm_id_priv);
2451 break;
2452 case IB_CM_DREQ_SENT:
2453 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2454 /* fall through */
2455 case IB_CM_REP_RCVD:
2456 case IB_CM_MRA_REP_SENT:
2457 cm_enter_timewait(cm_id_priv);
2458 break;
2459 case IB_CM_ESTABLISHED:
2460 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
2461 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
2462 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
2463 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2464 cm_id_priv->msg);
2465 cm_enter_timewait(cm_id_priv);
2466 break;
2467 }
2468 /* fall through */
2469 default:
2470 spin_unlock_irq(&cm_id_priv->lock);
2471 ret = -EINVAL;
2472 goto out;
2473 }
2474
2475 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2476 if (!ret)
2477 list_add_tail(&work->list, &cm_id_priv->work_list);
2478 spin_unlock_irq(&cm_id_priv->lock);
2479
2480 if (ret)
2481 cm_process_work(cm_id_priv, work);
2482 else
2483 cm_deref_id(cm_id_priv);
2484 return 0;
2485 out:
2486 cm_deref_id(cm_id_priv);
2487 return -EINVAL;
2488 }
2489
2490 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2491 u8 service_timeout,
2492 const void *private_data,
2493 u8 private_data_len)
2494 {
2495 struct cm_id_private *cm_id_priv;
2496 struct ib_mad_send_buf *msg;
2497 enum ib_cm_state cm_state;
2498 enum ib_cm_lap_state lap_state;
2499 enum cm_msg_response msg_response;
2500 void *data;
2501 unsigned long flags;
2502 int ret;
2503
2504 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2505 return -EINVAL;
2506
2507 data = cm_copy_private_data(private_data, private_data_len);
2508 if (IS_ERR(data))
2509 return PTR_ERR(data);
2510
2511 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2512
2513 spin_lock_irqsave(&cm_id_priv->lock, flags);
2514 switch(cm_id_priv->id.state) {
2515 case IB_CM_REQ_RCVD:
2516 cm_state = IB_CM_MRA_REQ_SENT;
2517 lap_state = cm_id->lap_state;
2518 msg_response = CM_MSG_RESPONSE_REQ;
2519 break;
2520 case IB_CM_REP_RCVD:
2521 cm_state = IB_CM_MRA_REP_SENT;
2522 lap_state = cm_id->lap_state;
2523 msg_response = CM_MSG_RESPONSE_REP;
2524 break;
2525 case IB_CM_ESTABLISHED:
2526 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
2527 cm_state = cm_id->state;
2528 lap_state = IB_CM_MRA_LAP_SENT;
2529 msg_response = CM_MSG_RESPONSE_OTHER;
2530 break;
2531 }
2532 default:
2533 ret = -EINVAL;
2534 goto error1;
2535 }
2536
2537 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
2538 ret = cm_alloc_msg(cm_id_priv, &msg);
2539 if (ret)
2540 goto error1;
2541
2542 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2543 msg_response, service_timeout,
2544 private_data, private_data_len);
2545 ret = ib_post_send_mad(msg, NULL);
2546 if (ret)
2547 goto error2;
2548 }
2549
2550 cm_id->state = cm_state;
2551 cm_id->lap_state = lap_state;
2552 cm_id_priv->service_timeout = service_timeout;
2553 cm_set_private_data(cm_id_priv, data, private_data_len);
2554 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2555 return 0;
2556
2557 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2558 kfree(data);
2559 return ret;
2560
2561 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2562 kfree(data);
2563 cm_free_msg(msg);
2564 return ret;
2565 }
2566 EXPORT_SYMBOL(ib_send_cm_mra);
2567
2568 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2569 {
2570 switch (cm_mra_get_msg_mraed(mra_msg)) {
2571 case CM_MSG_RESPONSE_REQ:
2572 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2573 case CM_MSG_RESPONSE_REP:
2574 case CM_MSG_RESPONSE_OTHER:
2575 return cm_acquire_id(mra_msg->remote_comm_id,
2576 mra_msg->local_comm_id);
2577 default:
2578 return NULL;
2579 }
2580 }
2581
2582 static int cm_mra_handler(struct cm_work *work)
2583 {
2584 struct cm_id_private *cm_id_priv;
2585 struct cm_mra_msg *mra_msg;
2586 int timeout, ret;
2587
2588 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2589 cm_id_priv = cm_acquire_mraed_id(mra_msg);
2590 if (!cm_id_priv)
2591 return -EINVAL;
2592
2593 work->cm_event.private_data = &mra_msg->private_data;
2594 work->cm_event.param.mra_rcvd.service_timeout =
2595 cm_mra_get_service_timeout(mra_msg);
2596 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2597 cm_convert_to_ms(cm_id_priv->av.timeout);
2598
2599 spin_lock_irq(&cm_id_priv->lock);
2600 switch (cm_id_priv->id.state) {
2601 case IB_CM_REQ_SENT:
2602 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2603 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2604 cm_id_priv->msg, timeout))
2605 goto out;
2606 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2607 break;
2608 case IB_CM_REP_SENT:
2609 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2610 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2611 cm_id_priv->msg, timeout))
2612 goto out;
2613 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2614 break;
2615 case IB_CM_ESTABLISHED:
2616 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2617 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2618 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2619 cm_id_priv->msg, timeout)) {
2620 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2621 atomic_long_inc(&work->port->
2622 counter_group[CM_RECV_DUPLICATES].
2623 counter[CM_MRA_COUNTER]);
2624 goto out;
2625 }
2626 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2627 break;
2628 case IB_CM_MRA_REQ_RCVD:
2629 case IB_CM_MRA_REP_RCVD:
2630 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2631 counter[CM_MRA_COUNTER]);
2632 /* fall through */
2633 default:
2634 goto out;
2635 }
2636
2637 cm_id_priv->msg->context[1] = (void *) (unsigned long)
2638 cm_id_priv->id.state;
2639 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2640 if (!ret)
2641 list_add_tail(&work->list, &cm_id_priv->work_list);
2642 spin_unlock_irq(&cm_id_priv->lock);
2643
2644 if (ret)
2645 cm_process_work(cm_id_priv, work);
2646 else
2647 cm_deref_id(cm_id_priv);
2648 return 0;
2649 out:
2650 spin_unlock_irq(&cm_id_priv->lock);
2651 cm_deref_id(cm_id_priv);
2652 return -EINVAL;
2653 }
2654
2655 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2656 struct cm_id_private *cm_id_priv,
2657 struct ib_sa_path_rec *alternate_path,
2658 const void *private_data,
2659 u8 private_data_len)
2660 {
2661 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2662 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2663 lap_msg->local_comm_id = cm_id_priv->id.local_id;
2664 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2665 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2666 /* todo: need remote CM response timeout */
2667 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2668 lap_msg->alt_local_lid = alternate_path->slid;
2669 lap_msg->alt_remote_lid = alternate_path->dlid;
2670 lap_msg->alt_local_gid = alternate_path->sgid;
2671 lap_msg->alt_remote_gid = alternate_path->dgid;
2672 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2673 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2674 lap_msg->alt_hop_limit = alternate_path->hop_limit;
2675 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2676 cm_lap_set_sl(lap_msg, alternate_path->sl);
2677 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2678 cm_lap_set_local_ack_timeout(lap_msg,
2679 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
2680 alternate_path->packet_life_time));
2681
2682 if (private_data && private_data_len)
2683 memcpy(lap_msg->private_data, private_data, private_data_len);
2684 }
2685
2686 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2687 struct ib_sa_path_rec *alternate_path,
2688 const void *private_data,
2689 u8 private_data_len)
2690 {
2691 struct cm_id_private *cm_id_priv;
2692 struct ib_mad_send_buf *msg;
2693 unsigned long flags;
2694 int ret;
2695
2696 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2697 return -EINVAL;
2698
2699 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2700 spin_lock_irqsave(&cm_id_priv->lock, flags);
2701 if (cm_id->state != IB_CM_ESTABLISHED ||
2702 (cm_id->lap_state != IB_CM_LAP_UNINIT &&
2703 cm_id->lap_state != IB_CM_LAP_IDLE)) {
2704 ret = -EINVAL;
2705 goto out;
2706 }
2707
2708 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av);
2709 if (ret)
2710 goto out;
2711 cm_id_priv->alt_av.timeout =
2712 cm_ack_timeout(cm_id_priv->target_ack_delay,
2713 cm_id_priv->alt_av.timeout - 1);
2714
2715 ret = cm_alloc_msg(cm_id_priv, &msg);
2716 if (ret)
2717 goto out;
2718
2719 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2720 alternate_path, private_data, private_data_len);
2721 msg->timeout_ms = cm_id_priv->timeout_ms;
2722 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2723
2724 ret = ib_post_send_mad(msg, NULL);
2725 if (ret) {
2726 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2727 cm_free_msg(msg);
2728 return ret;
2729 }
2730
2731 cm_id->lap_state = IB_CM_LAP_SENT;
2732 cm_id_priv->msg = msg;
2733
2734 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2735 return ret;
2736 }
2737 EXPORT_SYMBOL(ib_send_cm_lap);
2738
2739 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
2740 struct ib_sa_path_rec *path,
2741 struct cm_lap_msg *lap_msg)
2742 {
2743 memset(path, 0, sizeof *path);
2744 path->dgid = lap_msg->alt_local_gid;
2745 path->sgid = lap_msg->alt_remote_gid;
2746 path->dlid = lap_msg->alt_local_lid;
2747 path->slid = lap_msg->alt_remote_lid;
2748 path->flow_label = cm_lap_get_flow_label(lap_msg);
2749 path->hop_limit = lap_msg->alt_hop_limit;
2750 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2751 path->reversible = 1;
2752 path->pkey = cm_id_priv->pkey;
2753 path->sl = cm_lap_get_sl(lap_msg);
2754 path->mtu_selector = IB_SA_EQ;
2755 path->mtu = cm_id_priv->path_mtu;
2756 path->rate_selector = IB_SA_EQ;
2757 path->rate = cm_lap_get_packet_rate(lap_msg);
2758 path->packet_life_time_selector = IB_SA_EQ;
2759 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2760 path->packet_life_time -= (path->packet_life_time > 0);
2761 }
2762
2763 static int cm_lap_handler(struct cm_work *work)
2764 {
2765 struct cm_id_private *cm_id_priv;
2766 struct cm_lap_msg *lap_msg;
2767 struct ib_cm_lap_event_param *param;
2768 struct ib_mad_send_buf *msg = NULL;
2769 int ret;
2770
2771 /* todo: verify LAP request and send reject APR if invalid. */
2772 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2773 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2774 lap_msg->local_comm_id);
2775 if (!cm_id_priv)
2776 return -EINVAL;
2777
2778 param = &work->cm_event.param.lap_rcvd;
2779 param->alternate_path = &work->path[0];
2780 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
2781 work->cm_event.private_data = &lap_msg->private_data;
2782
2783 spin_lock_irq(&cm_id_priv->lock);
2784 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2785 goto unlock;
2786
2787 switch (cm_id_priv->id.lap_state) {
2788 case IB_CM_LAP_UNINIT:
2789 case IB_CM_LAP_IDLE:
2790 break;
2791 case IB_CM_MRA_LAP_SENT:
2792 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2793 counter[CM_LAP_COUNTER]);
2794 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2795 goto unlock;
2796
2797 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2798 CM_MSG_RESPONSE_OTHER,
2799 cm_id_priv->service_timeout,
2800 cm_id_priv->private_data,
2801 cm_id_priv->private_data_len);
2802 spin_unlock_irq(&cm_id_priv->lock);
2803
2804 if (ib_post_send_mad(msg, NULL))
2805 cm_free_msg(msg);
2806 goto deref;
2807 case IB_CM_LAP_RCVD:
2808 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2809 counter[CM_LAP_COUNTER]);
2810 goto unlock;
2811 default:
2812 goto unlock;
2813 }
2814
2815 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2816 cm_id_priv->tid = lap_msg->hdr.tid;
2817 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2818 work->mad_recv_wc->recv_buf.grh,
2819 &cm_id_priv->av);
2820 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av);
2821 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2822 if (!ret)
2823 list_add_tail(&work->list, &cm_id_priv->work_list);
2824 spin_unlock_irq(&cm_id_priv->lock);
2825
2826 if (ret)
2827 cm_process_work(cm_id_priv, work);
2828 else
2829 cm_deref_id(cm_id_priv);
2830 return 0;
2831
2832 unlock: spin_unlock_irq(&cm_id_priv->lock);
2833 deref: cm_deref_id(cm_id_priv);
2834 return -EINVAL;
2835 }
2836
2837 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2838 struct cm_id_private *cm_id_priv,
2839 enum ib_cm_apr_status status,
2840 void *info,
2841 u8 info_length,
2842 const void *private_data,
2843 u8 private_data_len)
2844 {
2845 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2846 apr_msg->local_comm_id = cm_id_priv->id.local_id;
2847 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2848 apr_msg->ap_status = (u8) status;
2849
2850 if (info && info_length) {
2851 apr_msg->info_length = info_length;
2852 memcpy(apr_msg->info, info, info_length);
2853 }
2854
2855 if (private_data && private_data_len)
2856 memcpy(apr_msg->private_data, private_data, private_data_len);
2857 }
2858
2859 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2860 enum ib_cm_apr_status status,
2861 void *info,
2862 u8 info_length,
2863 const void *private_data,
2864 u8 private_data_len)
2865 {
2866 struct cm_id_private *cm_id_priv;
2867 struct ib_mad_send_buf *msg;
2868 unsigned long flags;
2869 int ret;
2870
2871 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2872 (info && info_length > IB_CM_APR_INFO_LENGTH))
2873 return -EINVAL;
2874
2875 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2876 spin_lock_irqsave(&cm_id_priv->lock, flags);
2877 if (cm_id->state != IB_CM_ESTABLISHED ||
2878 (cm_id->lap_state != IB_CM_LAP_RCVD &&
2879 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2880 ret = -EINVAL;
2881 goto out;
2882 }
2883
2884 ret = cm_alloc_msg(cm_id_priv, &msg);
2885 if (ret)
2886 goto out;
2887
2888 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2889 info, info_length, private_data, private_data_len);
2890 ret = ib_post_send_mad(msg, NULL);
2891 if (ret) {
2892 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2893 cm_free_msg(msg);
2894 return ret;
2895 }
2896
2897 cm_id->lap_state = IB_CM_LAP_IDLE;
2898 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2899 return ret;
2900 }
2901 EXPORT_SYMBOL(ib_send_cm_apr);
2902
2903 static int cm_apr_handler(struct cm_work *work)
2904 {
2905 struct cm_id_private *cm_id_priv;
2906 struct cm_apr_msg *apr_msg;
2907 int ret;
2908
2909 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2910 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2911 apr_msg->local_comm_id);
2912 if (!cm_id_priv)
2913 return -EINVAL; /* Unmatched reply. */
2914
2915 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2916 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2917 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2918 work->cm_event.private_data = &apr_msg->private_data;
2919
2920 spin_lock_irq(&cm_id_priv->lock);
2921 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2922 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2923 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2924 spin_unlock_irq(&cm_id_priv->lock);
2925 goto out;
2926 }
2927 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2928 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2929 cm_id_priv->msg = NULL;
2930
2931 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2932 if (!ret)
2933 list_add_tail(&work->list, &cm_id_priv->work_list);
2934 spin_unlock_irq(&cm_id_priv->lock);
2935
2936 if (ret)
2937 cm_process_work(cm_id_priv, work);
2938 else
2939 cm_deref_id(cm_id_priv);
2940 return 0;
2941 out:
2942 cm_deref_id(cm_id_priv);
2943 return -EINVAL;
2944 }
2945
2946 static int cm_timewait_handler(struct cm_work *work)
2947 {
2948 struct cm_timewait_info *timewait_info;
2949 struct cm_id_private *cm_id_priv;
2950 int ret;
2951
2952 timewait_info = (struct cm_timewait_info *)work;
2953 spin_lock_irq(&cm.lock);
2954 list_del(&timewait_info->list);
2955 spin_unlock_irq(&cm.lock);
2956
2957 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2958 timewait_info->work.remote_id);
2959 if (!cm_id_priv)
2960 return -EINVAL;
2961
2962 spin_lock_irq(&cm_id_priv->lock);
2963 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2964 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2965 spin_unlock_irq(&cm_id_priv->lock);
2966 goto out;
2967 }
2968 cm_id_priv->id.state = IB_CM_IDLE;
2969 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2970 if (!ret)
2971 list_add_tail(&work->list, &cm_id_priv->work_list);
2972 spin_unlock_irq(&cm_id_priv->lock);
2973
2974 if (ret)
2975 cm_process_work(cm_id_priv, work);
2976 else
2977 cm_deref_id(cm_id_priv);
2978 return 0;
2979 out:
2980 cm_deref_id(cm_id_priv);
2981 return -EINVAL;
2982 }
2983
2984 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2985 struct cm_id_private *cm_id_priv,
2986 struct ib_cm_sidr_req_param *param)
2987 {
2988 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2989 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2990 sidr_req_msg->request_id = cm_id_priv->id.local_id;
2991 sidr_req_msg->pkey = param->path->pkey;
2992 sidr_req_msg->service_id = param->service_id;
2993
2994 if (param->private_data && param->private_data_len)
2995 memcpy(sidr_req_msg->private_data, param->private_data,
2996 param->private_data_len);
2997 }
2998
2999 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
3000 struct ib_cm_sidr_req_param *param)
3001 {
3002 struct cm_id_private *cm_id_priv;
3003 struct ib_mad_send_buf *msg;
3004 unsigned long flags;
3005 int ret;
3006
3007 if (!param->path || (param->private_data &&
3008 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
3009 return -EINVAL;
3010
3011 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3012 ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
3013 if (ret)
3014 goto out;
3015
3016 cm_id->service_id = param->service_id;
3017 cm_id->service_mask = ~cpu_to_be64(0);
3018 cm_id_priv->timeout_ms = param->timeout_ms;
3019 cm_id_priv->max_cm_retries = param->max_cm_retries;
3020 ret = cm_alloc_msg(cm_id_priv, &msg);
3021 if (ret)
3022 goto out;
3023
3024 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
3025 param);
3026 msg->timeout_ms = cm_id_priv->timeout_ms;
3027 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
3028
3029 spin_lock_irqsave(&cm_id_priv->lock, flags);
3030 if (cm_id->state == IB_CM_IDLE)
3031 ret = ib_post_send_mad(msg, NULL);
3032 else
3033 ret = -EINVAL;
3034
3035 if (ret) {
3036 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3037 cm_free_msg(msg);
3038 goto out;
3039 }
3040 cm_id->state = IB_CM_SIDR_REQ_SENT;
3041 cm_id_priv->msg = msg;
3042 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3043 out:
3044 return ret;
3045 }
3046 EXPORT_SYMBOL(ib_send_cm_sidr_req);
3047
3048 static void cm_format_sidr_req_event(struct cm_work *work,
3049 struct ib_cm_id *listen_id)
3050 {
3051 struct cm_sidr_req_msg *sidr_req_msg;
3052 struct ib_cm_sidr_req_event_param *param;
3053
3054 sidr_req_msg = (struct cm_sidr_req_msg *)
3055 work->mad_recv_wc->recv_buf.mad;
3056 param = &work->cm_event.param.sidr_req_rcvd;
3057 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
3058 param->listen_id = listen_id;
3059 param->service_id = sidr_req_msg->service_id;
3060 param->bth_pkey = cm_get_bth_pkey(work);
3061 param->port = work->port->port_num;
3062 work->cm_event.private_data = &sidr_req_msg->private_data;
3063 }
3064
3065 static int cm_sidr_req_handler(struct cm_work *work)
3066 {
3067 struct ib_cm_id *cm_id;
3068 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
3069 struct cm_sidr_req_msg *sidr_req_msg;
3070 struct ib_wc *wc;
3071
3072 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
3073 if (IS_ERR(cm_id))
3074 return PTR_ERR(cm_id);
3075 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3076
3077 /* Record SGID/SLID and request ID for lookup. */
3078 sidr_req_msg = (struct cm_sidr_req_msg *)
3079 work->mad_recv_wc->recv_buf.mad;
3080 wc = work->mad_recv_wc->wc;
3081 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
3082 cm_id_priv->av.dgid.global.interface_id = 0;
3083 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
3084 work->mad_recv_wc->recv_buf.grh,
3085 &cm_id_priv->av);
3086 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
3087 cm_id_priv->tid = sidr_req_msg->hdr.tid;
3088 atomic_inc(&cm_id_priv->work_count);
3089
3090 spin_lock_irq(&cm.lock);
3091 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3092 if (cur_cm_id_priv) {
3093 spin_unlock_irq(&cm.lock);
3094 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3095 counter[CM_SIDR_REQ_COUNTER]);
3096 goto out; /* Duplicate message. */
3097 }
3098 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3099 cur_cm_id_priv = cm_find_listen(cm_id->device,
3100 sidr_req_msg->service_id);
3101 if (!cur_cm_id_priv) {
3102 spin_unlock_irq(&cm.lock);
3103 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED);
3104 goto out; /* No match. */
3105 }
3106 atomic_inc(&cur_cm_id_priv->refcount);
3107 atomic_inc(&cm_id_priv->refcount);
3108 spin_unlock_irq(&cm.lock);
3109
3110 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
3111 cm_id_priv->id.context = cur_cm_id_priv->id.context;
3112 cm_id_priv->id.service_id = sidr_req_msg->service_id;
3113 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3114
3115 cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
3116 cm_process_work(cm_id_priv, work);
3117 cm_deref_id(cur_cm_id_priv);
3118 return 0;
3119 out:
3120 ib_destroy_cm_id(&cm_id_priv->id);
3121 return -EINVAL;
3122 }
3123
3124 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3125 struct cm_id_private *cm_id_priv,
3126 struct ib_cm_sidr_rep_param *param)
3127 {
3128 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3129 cm_id_priv->tid);
3130 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
3131 sidr_rep_msg->status = param->status;
3132 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
3133 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
3134 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
3135
3136 if (param->info && param->info_length)
3137 memcpy(sidr_rep_msg->info, param->info, param->info_length);
3138
3139 if (param->private_data && param->private_data_len)
3140 memcpy(sidr_rep_msg->private_data, param->private_data,
3141 param->private_data_len);
3142 }
3143
3144 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3145 struct ib_cm_sidr_rep_param *param)
3146 {
3147 struct cm_id_private *cm_id_priv;
3148 struct ib_mad_send_buf *msg;
3149 unsigned long flags;
3150 int ret;
3151
3152 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3153 (param->private_data &&
3154 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3155 return -EINVAL;
3156
3157 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3158 spin_lock_irqsave(&cm_id_priv->lock, flags);
3159 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
3160 ret = -EINVAL;
3161 goto error;
3162 }
3163
3164 ret = cm_alloc_msg(cm_id_priv, &msg);
3165 if (ret)
3166 goto error;
3167
3168 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3169 param);
3170 ret = ib_post_send_mad(msg, NULL);
3171 if (ret) {
3172 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3173 cm_free_msg(msg);
3174 return ret;
3175 }
3176 cm_id->state = IB_CM_IDLE;
3177 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3178
3179 spin_lock_irqsave(&cm.lock, flags);
3180 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) {
3181 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3182 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
3183 }
3184 spin_unlock_irqrestore(&cm.lock, flags);
3185 return 0;
3186
3187 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3188 return ret;
3189 }
3190 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3191
3192 static void cm_format_sidr_rep_event(struct cm_work *work)
3193 {
3194 struct cm_sidr_rep_msg *sidr_rep_msg;
3195 struct ib_cm_sidr_rep_event_param *param;
3196
3197 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3198 work->mad_recv_wc->recv_buf.mad;
3199 param = &work->cm_event.param.sidr_rep_rcvd;
3200 param->status = sidr_rep_msg->status;
3201 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
3202 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
3203 param->info = &sidr_rep_msg->info;
3204 param->info_len = sidr_rep_msg->info_length;
3205 work->cm_event.private_data = &sidr_rep_msg->private_data;
3206 }
3207
3208 static int cm_sidr_rep_handler(struct cm_work *work)
3209 {
3210 struct cm_sidr_rep_msg *sidr_rep_msg;
3211 struct cm_id_private *cm_id_priv;
3212
3213 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3214 work->mad_recv_wc->recv_buf.mad;
3215 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
3216 if (!cm_id_priv)
3217 return -EINVAL; /* Unmatched reply. */
3218
3219 spin_lock_irq(&cm_id_priv->lock);
3220 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3221 spin_unlock_irq(&cm_id_priv->lock);
3222 goto out;
3223 }
3224 cm_id_priv->id.state = IB_CM_IDLE;
3225 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3226 spin_unlock_irq(&cm_id_priv->lock);
3227
3228 cm_format_sidr_rep_event(work);
3229 cm_process_work(cm_id_priv, work);
3230 return 0;
3231 out:
3232 cm_deref_id(cm_id_priv);
3233 return -EINVAL;
3234 }
3235
3236 static void cm_process_send_error(struct ib_mad_send_buf *msg,
3237 enum ib_wc_status wc_status)
3238 {
3239 struct cm_id_private *cm_id_priv;
3240 struct ib_cm_event cm_event;
3241 enum ib_cm_state state;
3242 int ret;
3243
3244 memset(&cm_event, 0, sizeof cm_event);
3245 cm_id_priv = msg->context[0];
3246
3247 /* Discard old sends or ones without a response. */
3248 spin_lock_irq(&cm_id_priv->lock);
3249 state = (enum ib_cm_state) (unsigned long) msg->context[1];
3250 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3251 goto discard;
3252
3253 switch (state) {
3254 case IB_CM_REQ_SENT:
3255 case IB_CM_MRA_REQ_RCVD:
3256 cm_reset_to_idle(cm_id_priv);
3257 cm_event.event = IB_CM_REQ_ERROR;
3258 break;
3259 case IB_CM_REP_SENT:
3260 case IB_CM_MRA_REP_RCVD:
3261 cm_reset_to_idle(cm_id_priv);
3262 cm_event.event = IB_CM_REP_ERROR;
3263 break;
3264 case IB_CM_DREQ_SENT:
3265 cm_enter_timewait(cm_id_priv);
3266 cm_event.event = IB_CM_DREQ_ERROR;
3267 break;
3268 case IB_CM_SIDR_REQ_SENT:
3269 cm_id_priv->id.state = IB_CM_IDLE;
3270 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3271 break;
3272 default:
3273 goto discard;
3274 }
3275 spin_unlock_irq(&cm_id_priv->lock);
3276 cm_event.param.send_status = wc_status;
3277
3278 /* No other events can occur on the cm_id at this point. */
3279 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3280 cm_free_msg(msg);
3281 if (ret)
3282 ib_destroy_cm_id(&cm_id_priv->id);
3283 return;
3284 discard:
3285 spin_unlock_irq(&cm_id_priv->lock);
3286 cm_free_msg(msg);
3287 }
3288
3289 static void cm_send_handler(struct ib_mad_agent *mad_agent,
3290 struct ib_mad_send_wc *mad_send_wc)
3291 {
3292 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3293 struct cm_port *port;
3294 u16 attr_index;
3295
3296 port = mad_agent->context;
3297 attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3298 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3299
3300 /*
3301 * If the send was in response to a received message (context[0] is not
3302 * set to a cm_id), and is not a REJ, then it is a send that was
3303 * manually retried.
3304 */
3305 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3306 msg->retries = 1;
3307
3308 atomic_long_add(1 + msg->retries,
3309 &port->counter_group[CM_XMIT].counter[attr_index]);
3310 if (msg->retries)
3311 atomic_long_add(msg->retries,
3312 &port->counter_group[CM_XMIT_RETRIES].
3313 counter[attr_index]);
3314
3315 switch (mad_send_wc->status) {
3316 case IB_WC_SUCCESS:
3317 case IB_WC_WR_FLUSH_ERR:
3318 cm_free_msg(msg);
3319 break;
3320 default:
3321 if (msg->context[0] && msg->context[1])
3322 cm_process_send_error(msg, mad_send_wc->status);
3323 else
3324 cm_free_msg(msg);
3325 break;
3326 }
3327 }
3328
3329 static void cm_work_handler(struct work_struct *_work)
3330 {
3331 struct cm_work *work = container_of(_work, struct cm_work, work.work);
3332 int ret;
3333
3334 switch (work->cm_event.event) {
3335 case IB_CM_REQ_RECEIVED:
3336 ret = cm_req_handler(work);
3337 break;
3338 case IB_CM_MRA_RECEIVED:
3339 ret = cm_mra_handler(work);
3340 break;
3341 case IB_CM_REJ_RECEIVED:
3342 ret = cm_rej_handler(work);
3343 break;
3344 case IB_CM_REP_RECEIVED:
3345 ret = cm_rep_handler(work);
3346 break;
3347 case IB_CM_RTU_RECEIVED:
3348 ret = cm_rtu_handler(work);
3349 break;
3350 case IB_CM_USER_ESTABLISHED:
3351 ret = cm_establish_handler(work);
3352 break;
3353 case IB_CM_DREQ_RECEIVED:
3354 ret = cm_dreq_handler(work);
3355 break;
3356 case IB_CM_DREP_RECEIVED:
3357 ret = cm_drep_handler(work);
3358 break;
3359 case IB_CM_SIDR_REQ_RECEIVED:
3360 ret = cm_sidr_req_handler(work);
3361 break;
3362 case IB_CM_SIDR_REP_RECEIVED:
3363 ret = cm_sidr_rep_handler(work);
3364 break;
3365 case IB_CM_LAP_RECEIVED:
3366 ret = cm_lap_handler(work);
3367 break;
3368 case IB_CM_APR_RECEIVED:
3369 ret = cm_apr_handler(work);
3370 break;
3371 case IB_CM_TIMEWAIT_EXIT:
3372 ret = cm_timewait_handler(work);
3373 break;
3374 default:
3375 ret = -EINVAL;
3376 break;
3377 }
3378 if (ret)
3379 cm_free_work(work);
3380 }
3381
3382 static int cm_establish(struct ib_cm_id *cm_id)
3383 {
3384 struct cm_id_private *cm_id_priv;
3385 struct cm_work *work;
3386 unsigned long flags;
3387 int ret = 0;
3388 struct cm_device *cm_dev;
3389
3390 cm_dev = ib_get_client_data(cm_id->device, &cm_client);
3391 if (!cm_dev)
3392 return -ENODEV;
3393
3394 work = kmalloc(sizeof *work, GFP_ATOMIC);
3395 if (!work)
3396 return -ENOMEM;
3397
3398 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3399 spin_lock_irqsave(&cm_id_priv->lock, flags);
3400 switch (cm_id->state)
3401 {
3402 case IB_CM_REP_SENT:
3403 case IB_CM_MRA_REP_RCVD:
3404 cm_id->state = IB_CM_ESTABLISHED;
3405 break;
3406 case IB_CM_ESTABLISHED:
3407 ret = -EISCONN;
3408 break;
3409 default:
3410 ret = -EINVAL;
3411 break;
3412 }
3413 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3414
3415 if (ret) {
3416 kfree(work);
3417 goto out;
3418 }
3419
3420 /*
3421 * The CM worker thread may try to destroy the cm_id before it
3422 * can execute this work item. To prevent potential deadlock,
3423 * we need to find the cm_id once we're in the context of the
3424 * worker thread, rather than holding a reference on it.
3425 */
3426 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3427 work->local_id = cm_id->local_id;
3428 work->remote_id = cm_id->remote_id;
3429 work->mad_recv_wc = NULL;
3430 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3431
3432 /* Check if the device started its remove_one */
3433 spin_lock_irq(&cm.lock);
3434 if (!cm_dev->going_down) {
3435 queue_delayed_work(cm.wq, &work->work, 0);
3436 } else {
3437 kfree(work);
3438 ret = -ENODEV;
3439 }
3440 spin_unlock_irq(&cm.lock);
3441
3442 out:
3443 return ret;
3444 }
3445
3446 static int cm_migrate(struct ib_cm_id *cm_id)
3447 {
3448 struct cm_id_private *cm_id_priv;
3449 unsigned long flags;
3450 int ret = 0;
3451
3452 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3453 spin_lock_irqsave(&cm_id_priv->lock, flags);
3454 if (cm_id->state == IB_CM_ESTABLISHED &&
3455 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3456 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3457 cm_id->lap_state = IB_CM_LAP_IDLE;
3458 cm_id_priv->av = cm_id_priv->alt_av;
3459 } else
3460 ret = -EINVAL;
3461 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3462
3463 return ret;
3464 }
3465
3466 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3467 {
3468 int ret;
3469
3470 switch (event) {
3471 case IB_EVENT_COMM_EST:
3472 ret = cm_establish(cm_id);
3473 break;
3474 case IB_EVENT_PATH_MIG:
3475 ret = cm_migrate(cm_id);
3476 break;
3477 default:
3478 ret = -EINVAL;
3479 }
3480 return ret;
3481 }
3482 EXPORT_SYMBOL(ib_cm_notify);
3483
3484 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3485 struct ib_mad_recv_wc *mad_recv_wc)
3486 {
3487 struct cm_port *port = mad_agent->context;
3488 struct cm_work *work;
3489 enum ib_cm_event_type event;
3490 u16 attr_id;
3491 int paths = 0;
3492 int going_down = 0;
3493
3494 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3495 case CM_REQ_ATTR_ID:
3496 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3497 alt_local_lid != 0);
3498 event = IB_CM_REQ_RECEIVED;
3499 break;
3500 case CM_MRA_ATTR_ID:
3501 event = IB_CM_MRA_RECEIVED;
3502 break;
3503 case CM_REJ_ATTR_ID:
3504 event = IB_CM_REJ_RECEIVED;
3505 break;
3506 case CM_REP_ATTR_ID:
3507 event = IB_CM_REP_RECEIVED;
3508 break;
3509 case CM_RTU_ATTR_ID:
3510 event = IB_CM_RTU_RECEIVED;
3511 break;
3512 case CM_DREQ_ATTR_ID:
3513 event = IB_CM_DREQ_RECEIVED;
3514 break;
3515 case CM_DREP_ATTR_ID:
3516 event = IB_CM_DREP_RECEIVED;
3517 break;
3518 case CM_SIDR_REQ_ATTR_ID:
3519 event = IB_CM_SIDR_REQ_RECEIVED;
3520 break;
3521 case CM_SIDR_REP_ATTR_ID:
3522 event = IB_CM_SIDR_REP_RECEIVED;
3523 break;
3524 case CM_LAP_ATTR_ID:
3525 paths = 1;
3526 event = IB_CM_LAP_RECEIVED;
3527 break;
3528 case CM_APR_ATTR_ID:
3529 event = IB_CM_APR_RECEIVED;
3530 break;
3531 default:
3532 ib_free_recv_mad(mad_recv_wc);
3533 return;
3534 }
3535
3536 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
3537 atomic_long_inc(&port->counter_group[CM_RECV].
3538 counter[attr_id - CM_ATTR_ID_OFFSET]);
3539
3540 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3541 GFP_KERNEL);
3542 if (!work) {
3543 ib_free_recv_mad(mad_recv_wc);
3544 return;
3545 }
3546
3547 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3548 work->cm_event.event = event;
3549 work->mad_recv_wc = mad_recv_wc;
3550 work->port = port;
3551
3552 /* Check if the device started its remove_one */
3553 spin_lock_irq(&cm.lock);
3554 if (!port->cm_dev->going_down)
3555 queue_delayed_work(cm.wq, &work->work, 0);
3556 else
3557 going_down = 1;
3558 spin_unlock_irq(&cm.lock);
3559
3560 if (going_down) {
3561 kfree(work);
3562 ib_free_recv_mad(mad_recv_wc);
3563 }
3564 }
3565
3566 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3567 struct ib_qp_attr *qp_attr,
3568 int *qp_attr_mask)
3569 {
3570 unsigned long flags;
3571 int ret;
3572
3573 spin_lock_irqsave(&cm_id_priv->lock, flags);
3574 switch (cm_id_priv->id.state) {
3575 case IB_CM_REQ_SENT:
3576 case IB_CM_MRA_REQ_RCVD:
3577 case IB_CM_REQ_RCVD:
3578 case IB_CM_MRA_REQ_SENT:
3579 case IB_CM_REP_RCVD:
3580 case IB_CM_MRA_REP_SENT:
3581 case IB_CM_REP_SENT:
3582 case IB_CM_MRA_REP_RCVD:
3583 case IB_CM_ESTABLISHED:
3584 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3585 IB_QP_PKEY_INDEX | IB_QP_PORT;
3586 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
3587 if (cm_id_priv->responder_resources)
3588 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3589 IB_ACCESS_REMOTE_ATOMIC;
3590 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3591 qp_attr->port_num = cm_id_priv->av.port->port_num;
3592 ret = 0;
3593 break;
3594 default:
3595 ret = -EINVAL;
3596 break;
3597 }
3598 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3599 return ret;
3600 }
3601
3602 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3603 struct ib_qp_attr *qp_attr,
3604 int *qp_attr_mask)
3605 {
3606 unsigned long flags;
3607 int ret;
3608
3609 spin_lock_irqsave(&cm_id_priv->lock, flags);
3610 switch (cm_id_priv->id.state) {
3611 case IB_CM_REQ_RCVD:
3612 case IB_CM_MRA_REQ_SENT:
3613 case IB_CM_REP_RCVD:
3614 case IB_CM_MRA_REP_SENT:
3615 case IB_CM_REP_SENT:
3616 case IB_CM_MRA_REP_RCVD:
3617 case IB_CM_ESTABLISHED:
3618 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3619 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3620 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3621 qp_attr->path_mtu = cm_id_priv->path_mtu;
3622 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3623 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3624 if (cm_id_priv->qp_type == IB_QPT_RC ||
3625 cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
3626 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3627 IB_QP_MIN_RNR_TIMER;
3628 qp_attr->max_dest_rd_atomic =
3629 cm_id_priv->responder_resources;
3630 qp_attr->min_rnr_timer = 0;
3631 }
3632 if (cm_id_priv->alt_av.ah_attr.dlid) {
3633 *qp_attr_mask |= IB_QP_ALT_PATH;
3634 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3635 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3636 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3637 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3638 }
3639 ret = 0;
3640 break;
3641 default:
3642 ret = -EINVAL;
3643 break;
3644 }
3645 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3646 return ret;
3647 }
3648
3649 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3650 struct ib_qp_attr *qp_attr,
3651 int *qp_attr_mask)
3652 {
3653 unsigned long flags;
3654 int ret;
3655
3656 spin_lock_irqsave(&cm_id_priv->lock, flags);
3657 switch (cm_id_priv->id.state) {
3658 /* Allow transition to RTS before sending REP */
3659 case IB_CM_REQ_RCVD:
3660 case IB_CM_MRA_REQ_SENT:
3661
3662 case IB_CM_REP_RCVD:
3663 case IB_CM_MRA_REP_SENT:
3664 case IB_CM_REP_SENT:
3665 case IB_CM_MRA_REP_RCVD:
3666 case IB_CM_ESTABLISHED:
3667 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
3668 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3669 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3670 switch (cm_id_priv->qp_type) {
3671 case IB_QPT_RC:
3672 case IB_QPT_XRC_INI:
3673 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
3674 IB_QP_MAX_QP_RD_ATOMIC;
3675 qp_attr->retry_cnt = cm_id_priv->retry_count;
3676 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3677 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3678 /* fall through */
3679 case IB_QPT_XRC_TGT:
3680 *qp_attr_mask |= IB_QP_TIMEOUT;
3681 qp_attr->timeout = cm_id_priv->av.timeout;
3682 break;
3683 default:
3684 break;
3685 }
3686 if (cm_id_priv->alt_av.ah_attr.dlid) {
3687 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3688 qp_attr->path_mig_state = IB_MIG_REARM;
3689 }
3690 } else {
3691 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
3692 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3693 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3694 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3695 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3696 qp_attr->path_mig_state = IB_MIG_REARM;
3697 }
3698 ret = 0;
3699 break;
3700 default:
3701 ret = -EINVAL;
3702 break;
3703 }
3704 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3705 return ret;
3706 }
3707
3708 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3709 struct ib_qp_attr *qp_attr,
3710 int *qp_attr_mask)
3711 {
3712 struct cm_id_private *cm_id_priv;
3713 int ret;
3714
3715 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3716 switch (qp_attr->qp_state) {
3717 case IB_QPS_INIT:
3718 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3719 break;
3720 case IB_QPS_RTR:
3721 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3722 break;
3723 case IB_QPS_RTS:
3724 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3725 break;
3726 default:
3727 ret = -EINVAL;
3728 break;
3729 }
3730 return ret;
3731 }
3732 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3733
3734 static void cm_get_ack_delay(struct cm_device *cm_dev)
3735 {
3736 struct ib_device_attr attr;
3737
3738 if (ib_query_device(cm_dev->ib_device, &attr))
3739 cm_dev->ack_delay = 0; /* acks will rely on packet life time */
3740 else
3741 cm_dev->ack_delay = attr.local_ca_ack_delay;
3742 }
3743
3744 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
3745 char *buf)
3746 {
3747 struct cm_counter_group *group;
3748 struct cm_counter_attribute *cm_attr;
3749
3750 group = container_of(obj, struct cm_counter_group, obj);
3751 cm_attr = container_of(attr, struct cm_counter_attribute, attr);
3752
3753 return sprintf(buf, "%ld\n",
3754 atomic_long_read(&group->counter[cm_attr->index]));
3755 }
3756
3757 static const struct sysfs_ops cm_counter_ops = {
3758 .show = cm_show_counter
3759 };
3760
3761 static struct kobj_type cm_counter_obj_type = {
3762 .sysfs_ops = &cm_counter_ops,
3763 .default_attrs = cm_counter_default_attrs
3764 };
3765
3766 static void cm_release_port_obj(struct kobject *obj)
3767 {
3768 struct cm_port *cm_port;
3769
3770 cm_port = container_of(obj, struct cm_port, port_obj);
3771 kfree(cm_port);
3772 }
3773
3774 static struct kobj_type cm_port_obj_type = {
3775 .release = cm_release_port_obj
3776 };
3777
3778 static char *cm_devnode(struct device *dev, umode_t *mode)
3779 {
3780 if (mode)
3781 *mode = 0666;
3782 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
3783 }
3784
3785 struct class cm_class = {
3786 .owner = THIS_MODULE,
3787 .name = "infiniband_cm",
3788 .devnode = cm_devnode,
3789 };
3790 EXPORT_SYMBOL(cm_class);
3791
3792 static int cm_create_port_fs(struct cm_port *port)
3793 {
3794 int i, ret;
3795
3796 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type,
3797 &port->cm_dev->device->kobj,
3798 "%d", port->port_num);
3799 if (ret) {
3800 kfree(port);
3801 return ret;
3802 }
3803
3804 for (i = 0; i < CM_COUNTER_GROUPS; i++) {
3805 ret = kobject_init_and_add(&port->counter_group[i].obj,
3806 &cm_counter_obj_type,
3807 &port->port_obj,
3808 "%s", counter_group_names[i]);
3809 if (ret)
3810 goto error;
3811 }
3812
3813 return 0;
3814
3815 error:
3816 while (i--)
3817 kobject_put(&port->counter_group[i].obj);
3818 kobject_put(&port->port_obj);
3819 return ret;
3820
3821 }
3822
3823 static void cm_remove_port_fs(struct cm_port *port)
3824 {
3825 int i;
3826
3827 for (i = 0; i < CM_COUNTER_GROUPS; i++)
3828 kobject_put(&port->counter_group[i].obj);
3829
3830 kobject_put(&port->port_obj);
3831 }
3832
3833 static void cm_add_one(struct ib_device *ib_device)
3834 {
3835 struct cm_device *cm_dev;
3836 struct cm_port *port;
3837 struct ib_mad_reg_req reg_req = {
3838 .mgmt_class = IB_MGMT_CLASS_CM,
3839 .mgmt_class_version = IB_CM_CLASS_VERSION,
3840 };
3841 struct ib_port_modify port_modify = {
3842 .set_port_cap_mask = IB_PORT_CM_SUP
3843 };
3844 unsigned long flags;
3845 int ret;
3846 int count = 0;
3847 u8 i;
3848
3849 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) *
3850 ib_device->phys_port_cnt, GFP_KERNEL);
3851 if (!cm_dev)
3852 return;
3853
3854 cm_dev->ib_device = ib_device;
3855 cm_get_ack_delay(cm_dev);
3856 cm_dev->going_down = 0;
3857 cm_dev->device = device_create(&cm_class, &ib_device->dev,
3858 MKDEV(0, 0), NULL,
3859 "%s", ib_device->name);
3860 if (IS_ERR(cm_dev->device)) {
3861 kfree(cm_dev);
3862 return;
3863 }
3864
3865 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3866 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3867 if (!rdma_cap_ib_cm(ib_device, i))
3868 continue;
3869
3870 port = kzalloc(sizeof *port, GFP_KERNEL);
3871 if (!port)
3872 goto error1;
3873
3874 cm_dev->port[i-1] = port;
3875 port->cm_dev = cm_dev;
3876 port->port_num = i;
3877
3878 ret = cm_create_port_fs(port);
3879 if (ret)
3880 goto error1;
3881
3882 port->mad_agent = ib_register_mad_agent(ib_device, i,
3883 IB_QPT_GSI,
3884 &reg_req,
3885 0,
3886 cm_send_handler,
3887 cm_recv_handler,
3888 port,
3889 0);
3890 if (IS_ERR(port->mad_agent))
3891 goto error2;
3892
3893 ret = ib_modify_port(ib_device, i, 0, &port_modify);
3894 if (ret)
3895 goto error3;
3896
3897 count++;
3898 }
3899
3900 if (!count)
3901 goto free;
3902
3903 ib_set_client_data(ib_device, &cm_client, cm_dev);
3904
3905 write_lock_irqsave(&cm.device_lock, flags);
3906 list_add_tail(&cm_dev->list, &cm.device_list);
3907 write_unlock_irqrestore(&cm.device_lock, flags);
3908 return;
3909
3910 error3:
3911 ib_unregister_mad_agent(port->mad_agent);
3912 error2:
3913 cm_remove_port_fs(port);
3914 error1:
3915 port_modify.set_port_cap_mask = 0;
3916 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3917 while (--i) {
3918 if (!rdma_cap_ib_cm(ib_device, i))
3919 continue;
3920
3921 port = cm_dev->port[i-1];
3922 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3923 ib_unregister_mad_agent(port->mad_agent);
3924 cm_remove_port_fs(port);
3925 }
3926 free:
3927 device_unregister(cm_dev->device);
3928 kfree(cm_dev);
3929 }
3930
3931 static void cm_remove_one(struct ib_device *ib_device, void *client_data)
3932 {
3933 struct cm_device *cm_dev = client_data;
3934 struct cm_port *port;
3935 struct ib_port_modify port_modify = {
3936 .clr_port_cap_mask = IB_PORT_CM_SUP
3937 };
3938 unsigned long flags;
3939 int i;
3940
3941 if (!cm_dev)
3942 return;
3943
3944 write_lock_irqsave(&cm.device_lock, flags);
3945 list_del(&cm_dev->list);
3946 write_unlock_irqrestore(&cm.device_lock, flags);
3947
3948 spin_lock_irq(&cm.lock);
3949 cm_dev->going_down = 1;
3950 spin_unlock_irq(&cm.lock);
3951
3952 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3953 if (!rdma_cap_ib_cm(ib_device, i))
3954 continue;
3955
3956 port = cm_dev->port[i-1];
3957 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3958 /*
3959 * We flush the queue here after the going_down set, this
3960 * verify that no new works will be queued in the recv handler,
3961 * after that we can call the unregister_mad_agent
3962 */
3963 flush_workqueue(cm.wq);
3964 ib_unregister_mad_agent(port->mad_agent);
3965 cm_remove_port_fs(port);
3966 }
3967 device_unregister(cm_dev->device);
3968 kfree(cm_dev);
3969 }
3970
3971 static int __init ib_cm_init(void)
3972 {
3973 int ret;
3974
3975 memset(&cm, 0, sizeof cm);
3976 INIT_LIST_HEAD(&cm.device_list);
3977 rwlock_init(&cm.device_lock);
3978 spin_lock_init(&cm.lock);
3979 cm.listen_service_table = RB_ROOT;
3980 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3981 cm.remote_id_table = RB_ROOT;
3982 cm.remote_qp_table = RB_ROOT;
3983 cm.remote_sidr_table = RB_ROOT;
3984 idr_init(&cm.local_id_table);
3985 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3986 INIT_LIST_HEAD(&cm.timewait_list);
3987
3988 ret = class_register(&cm_class);
3989 if (ret) {
3990 ret = -ENOMEM;
3991 goto error1;
3992 }
3993
3994 cm.wq = create_workqueue("ib_cm");
3995 if (!cm.wq) {
3996 ret = -ENOMEM;
3997 goto error2;
3998 }
3999
4000 ret = ib_register_client(&cm_client);
4001 if (ret)
4002 goto error3;
4003
4004 return 0;
4005 error3:
4006 destroy_workqueue(cm.wq);
4007 error2:
4008 class_unregister(&cm_class);
4009 error1:
4010 idr_destroy(&cm.local_id_table);
4011 return ret;
4012 }
4013
4014 static void __exit ib_cm_cleanup(void)
4015 {
4016 struct cm_timewait_info *timewait_info, *tmp;
4017
4018 spin_lock_irq(&cm.lock);
4019 list_for_each_entry(timewait_info, &cm.timewait_list, list)
4020 cancel_delayed_work(&timewait_info->work.work);
4021 spin_unlock_irq(&cm.lock);
4022
4023 ib_unregister_client(&cm_client);
4024 destroy_workqueue(cm.wq);
4025
4026 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
4027 list_del(&timewait_info->list);
4028 kfree(timewait_info);
4029 }
4030
4031 class_unregister(&cm_class);
4032 idr_destroy(&cm.local_id_table);
4033 }
4034
4035 module_init(ib_cm_init);
4036 module_exit(ib_cm_cleanup);
4037
Linux with added FPC-III support