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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma
[mirror_ubuntu-artful-kernel.git] / drivers / infiniband / core / cm.c
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 const char * const ibcm_rej_reason_strs[] = {
61 [IB_CM_REJ_NO_QP] = "no QP",
62 [IB_CM_REJ_NO_EEC] = "no EEC",
63 [IB_CM_REJ_NO_RESOURCES] = "no resources",
64 [IB_CM_REJ_TIMEOUT] = "timeout",
65 [IB_CM_REJ_UNSUPPORTED] = "unsupported",
66 [IB_CM_REJ_INVALID_COMM_ID] = "invalid comm ID",
67 [IB_CM_REJ_INVALID_COMM_INSTANCE] = "invalid comm instance",
68 [IB_CM_REJ_INVALID_SERVICE_ID] = "invalid service ID",
69 [IB_CM_REJ_INVALID_TRANSPORT_TYPE] = "invalid transport type",
70 [IB_CM_REJ_STALE_CONN] = "stale conn",
71 [IB_CM_REJ_RDC_NOT_EXIST] = "RDC not exist",
72 [IB_CM_REJ_INVALID_GID] = "invalid GID",
73 [IB_CM_REJ_INVALID_LID] = "invalid LID",
74 [IB_CM_REJ_INVALID_SL] = "invalid SL",
75 [IB_CM_REJ_INVALID_TRAFFIC_CLASS] = "invalid traffic class",
76 [IB_CM_REJ_INVALID_HOP_LIMIT] = "invalid hop limit",
77 [IB_CM_REJ_INVALID_PACKET_RATE] = "invalid packet rate",
78 [IB_CM_REJ_INVALID_ALT_GID] = "invalid alt GID",
79 [IB_CM_REJ_INVALID_ALT_LID] = "invalid alt LID",
80 [IB_CM_REJ_INVALID_ALT_SL] = "invalid alt SL",
81 [IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS] = "invalid alt traffic class",
82 [IB_CM_REJ_INVALID_ALT_HOP_LIMIT] = "invalid alt hop limit",
83 [IB_CM_REJ_INVALID_ALT_PACKET_RATE] = "invalid alt packet rate",
84 [IB_CM_REJ_PORT_CM_REDIRECT] = "port CM redirect",
85 [IB_CM_REJ_PORT_REDIRECT] = "port redirect",
86 [IB_CM_REJ_INVALID_MTU] = "invalid MTU",
87 [IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES] = "insufficient resp resources",
88 [IB_CM_REJ_CONSUMER_DEFINED] = "consumer defined",
89 [IB_CM_REJ_INVALID_RNR_RETRY] = "invalid RNR retry",
90 [IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID] = "duplicate local comm ID",
91 [IB_CM_REJ_INVALID_CLASS_VERSION] = "invalid class version",
92 [IB_CM_REJ_INVALID_FLOW_LABEL] = "invalid flow label",
93 [IB_CM_REJ_INVALID_ALT_FLOW_LABEL] = "invalid alt flow label",
94 };
95
96 const char *__attribute_const__ ibcm_reject_msg(int reason)
97 {
98 size_t index = reason;
99
100 if (index < ARRAY_SIZE(ibcm_rej_reason_strs) &&
101 ibcm_rej_reason_strs[index])
102 return ibcm_rej_reason_strs[index];
103 else
104 return "unrecognized reason";
105 }
106 EXPORT_SYMBOL(ibcm_reject_msg);
107
108 static void cm_add_one(struct ib_device *device);
109 static void cm_remove_one(struct ib_device *device, void *client_data);
110
111 static struct ib_client cm_client = {
112 .name = "cm",
113 .add = cm_add_one,
114 .remove = cm_remove_one
115 };
116
117 static struct ib_cm {
118 spinlock_t lock;
119 struct list_head device_list;
120 rwlock_t device_lock;
121 struct rb_root listen_service_table;
122 u64 listen_service_id;
123 /* struct rb_root peer_service_table; todo: fix peer to peer */
124 struct rb_root remote_qp_table;
125 struct rb_root remote_id_table;
126 struct rb_root remote_sidr_table;
127 struct idr local_id_table;
128 __be32 random_id_operand;
129 struct list_head timewait_list;
130 struct workqueue_struct *wq;
131 /* Sync on cm change port state */
132 spinlock_t state_lock;
133 } cm;
134
135 /* Counter indexes ordered by attribute ID */
136 enum {
137 CM_REQ_COUNTER,
138 CM_MRA_COUNTER,
139 CM_REJ_COUNTER,
140 CM_REP_COUNTER,
141 CM_RTU_COUNTER,
142 CM_DREQ_COUNTER,
143 CM_DREP_COUNTER,
144 CM_SIDR_REQ_COUNTER,
145 CM_SIDR_REP_COUNTER,
146 CM_LAP_COUNTER,
147 CM_APR_COUNTER,
148 CM_ATTR_COUNT,
149 CM_ATTR_ID_OFFSET = 0x0010,
150 };
151
152 enum {
153 CM_XMIT,
154 CM_XMIT_RETRIES,
155 CM_RECV,
156 CM_RECV_DUPLICATES,
157 CM_COUNTER_GROUPS
158 };
159
160 static char const counter_group_names[CM_COUNTER_GROUPS]
161 [sizeof("cm_rx_duplicates")] = {
162 "cm_tx_msgs", "cm_tx_retries",
163 "cm_rx_msgs", "cm_rx_duplicates"
164 };
165
166 struct cm_counter_group {
167 struct kobject obj;
168 atomic_long_t counter[CM_ATTR_COUNT];
169 };
170
171 struct cm_counter_attribute {
172 struct attribute attr;
173 int index;
174 };
175
176 #define CM_COUNTER_ATTR(_name, _index) \
177 struct cm_counter_attribute cm_##_name##_counter_attr = { \
178 .attr = { .name = __stringify(_name), .mode = 0444 }, \
179 .index = _index \
180 }
181
182 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
183 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
184 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
185 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
186 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
187 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
188 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
189 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
190 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
191 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
192 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
193
194 static struct attribute *cm_counter_default_attrs[] = {
195 &cm_req_counter_attr.attr,
196 &cm_mra_counter_attr.attr,
197 &cm_rej_counter_attr.attr,
198 &cm_rep_counter_attr.attr,
199 &cm_rtu_counter_attr.attr,
200 &cm_dreq_counter_attr.attr,
201 &cm_drep_counter_attr.attr,
202 &cm_sidr_req_counter_attr.attr,
203 &cm_sidr_rep_counter_attr.attr,
204 &cm_lap_counter_attr.attr,
205 &cm_apr_counter_attr.attr,
206 NULL
207 };
208
209 struct cm_port {
210 struct cm_device *cm_dev;
211 struct ib_mad_agent *mad_agent;
212 struct kobject port_obj;
213 u8 port_num;
214 struct list_head cm_priv_prim_list;
215 struct list_head cm_priv_altr_list;
216 struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
217 };
218
219 struct cm_device {
220 struct list_head list;
221 struct ib_device *ib_device;
222 struct device *device;
223 u8 ack_delay;
224 int going_down;
225 struct cm_port *port[0];
226 };
227
228 struct cm_av {
229 struct cm_port *port;
230 union ib_gid dgid;
231 struct ib_ah_attr ah_attr;
232 u16 pkey_index;
233 u8 timeout;
234 };
235
236 struct cm_work {
237 struct delayed_work work;
238 struct list_head list;
239 struct cm_port *port;
240 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
241 __be32 local_id; /* Established / timewait */
242 __be32 remote_id;
243 struct ib_cm_event cm_event;
244 struct ib_sa_path_rec path[0];
245 };
246
247 struct cm_timewait_info {
248 struct cm_work work; /* Must be first. */
249 struct list_head list;
250 struct rb_node remote_qp_node;
251 struct rb_node remote_id_node;
252 __be64 remote_ca_guid;
253 __be32 remote_qpn;
254 u8 inserted_remote_qp;
255 u8 inserted_remote_id;
256 };
257
258 struct cm_id_private {
259 struct ib_cm_id id;
260
261 struct rb_node service_node;
262 struct rb_node sidr_id_node;
263 spinlock_t lock; /* Do not acquire inside cm.lock */
264 struct completion comp;
265 atomic_t refcount;
266 /* Number of clients sharing this ib_cm_id. Only valid for listeners.
267 * Protected by the cm.lock spinlock. */
268 int listen_sharecount;
269
270 struct ib_mad_send_buf *msg;
271 struct cm_timewait_info *timewait_info;
272 /* todo: use alternate port on send failure */
273 struct cm_av av;
274 struct cm_av alt_av;
275
276 void *private_data;
277 __be64 tid;
278 __be32 local_qpn;
279 __be32 remote_qpn;
280 enum ib_qp_type qp_type;
281 __be32 sq_psn;
282 __be32 rq_psn;
283 int timeout_ms;
284 enum ib_mtu path_mtu;
285 __be16 pkey;
286 u8 private_data_len;
287 u8 max_cm_retries;
288 u8 peer_to_peer;
289 u8 responder_resources;
290 u8 initiator_depth;
291 u8 retry_count;
292 u8 rnr_retry_count;
293 u8 service_timeout;
294 u8 target_ack_delay;
295
296 struct list_head prim_list;
297 struct list_head altr_list;
298 /* Indicates that the send port mad is registered and av is set */
299 int prim_send_port_not_ready;
300 int altr_send_port_not_ready;
301
302 struct list_head work_list;
303 atomic_t work_count;
304 };
305
306 static void cm_work_handler(struct work_struct *work);
307
308 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
309 {
310 if (atomic_dec_and_test(&cm_id_priv->refcount))
311 complete(&cm_id_priv->comp);
312 }
313
314 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
315 struct ib_mad_send_buf **msg)
316 {
317 struct ib_mad_agent *mad_agent;
318 struct ib_mad_send_buf *m;
319 struct ib_ah *ah;
320 struct cm_av *av;
321 unsigned long flags, flags2;
322 int ret = 0;
323
324 /* don't let the port to be released till the agent is down */
325 spin_lock_irqsave(&cm.state_lock, flags2);
326 spin_lock_irqsave(&cm.lock, flags);
327 if (!cm_id_priv->prim_send_port_not_ready)
328 av = &cm_id_priv->av;
329 else if (!cm_id_priv->altr_send_port_not_ready &&
330 (cm_id_priv->alt_av.port))
331 av = &cm_id_priv->alt_av;
332 else {
333 pr_info("%s: not valid CM id\n", __func__);
334 ret = -ENODEV;
335 spin_unlock_irqrestore(&cm.lock, flags);
336 goto out;
337 }
338 spin_unlock_irqrestore(&cm.lock, flags);
339 /* Make sure the port haven't released the mad yet */
340 mad_agent = cm_id_priv->av.port->mad_agent;
341 if (!mad_agent) {
342 pr_info("%s: not a valid MAD agent\n", __func__);
343 ret = -ENODEV;
344 goto out;
345 }
346 ah = ib_create_ah(mad_agent->qp->pd, &av->ah_attr);
347 if (IS_ERR(ah)) {
348 ret = PTR_ERR(ah);
349 goto out;
350 }
351
352 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
353 av->pkey_index,
354 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
355 GFP_ATOMIC,
356 IB_MGMT_BASE_VERSION);
357 if (IS_ERR(m)) {
358 ib_destroy_ah(ah);
359 ret = PTR_ERR(m);
360 goto out;
361 }
362
363 /* Timeout set by caller if response is expected. */
364 m->ah = ah;
365 m->retries = cm_id_priv->max_cm_retries;
366
367 atomic_inc(&cm_id_priv->refcount);
368 m->context[0] = cm_id_priv;
369 *msg = m;
370
371 out:
372 spin_unlock_irqrestore(&cm.state_lock, flags2);
373 return ret;
374 }
375
376 static int cm_alloc_response_msg(struct cm_port *port,
377 struct ib_mad_recv_wc *mad_recv_wc,
378 struct ib_mad_send_buf **msg)
379 {
380 struct ib_mad_send_buf *m;
381 struct ib_ah *ah;
382
383 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
384 mad_recv_wc->recv_buf.grh, port->port_num);
385 if (IS_ERR(ah))
386 return PTR_ERR(ah);
387
388 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
389 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
390 GFP_ATOMIC,
391 IB_MGMT_BASE_VERSION);
392 if (IS_ERR(m)) {
393 ib_destroy_ah(ah);
394 return PTR_ERR(m);
395 }
396 m->ah = ah;
397 *msg = m;
398 return 0;
399 }
400
401 static void cm_free_msg(struct ib_mad_send_buf *msg)
402 {
403 ib_destroy_ah(msg->ah);
404 if (msg->context[0])
405 cm_deref_id(msg->context[0]);
406 ib_free_send_mad(msg);
407 }
408
409 static void * cm_copy_private_data(const void *private_data,
410 u8 private_data_len)
411 {
412 void *data;
413
414 if (!private_data || !private_data_len)
415 return NULL;
416
417 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
418 if (!data)
419 return ERR_PTR(-ENOMEM);
420
421 return data;
422 }
423
424 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
425 void *private_data, u8 private_data_len)
426 {
427 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
428 kfree(cm_id_priv->private_data);
429
430 cm_id_priv->private_data = private_data;
431 cm_id_priv->private_data_len = private_data_len;
432 }
433
434 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
435 struct ib_grh *grh, struct cm_av *av)
436 {
437 av->port = port;
438 av->pkey_index = wc->pkey_index;
439 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc,
440 grh, &av->ah_attr);
441 }
442
443 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av,
444 struct cm_id_private *cm_id_priv)
445 {
446 struct cm_device *cm_dev;
447 struct cm_port *port = NULL;
448 unsigned long flags;
449 int ret;
450 u8 p;
451 struct net_device *ndev = ib_get_ndev_from_path(path);
452
453 read_lock_irqsave(&cm.device_lock, flags);
454 list_for_each_entry(cm_dev, &cm.device_list, list) {
455 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid,
456 path->gid_type, ndev, &p, NULL)) {
457 port = cm_dev->port[p-1];
458 break;
459 }
460 }
461 read_unlock_irqrestore(&cm.device_lock, flags);
462
463 if (ndev)
464 dev_put(ndev);
465
466 if (!port)
467 return -EINVAL;
468
469 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
470 be16_to_cpu(path->pkey), &av->pkey_index);
471 if (ret)
472 return ret;
473
474 av->port = port;
475 ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path,
476 &av->ah_attr);
477 av->timeout = path->packet_life_time + 1;
478
479 spin_lock_irqsave(&cm.lock, flags);
480 if (&cm_id_priv->av == av)
481 list_add_tail(&cm_id_priv->prim_list, &port->cm_priv_prim_list);
482 else if (&cm_id_priv->alt_av == av)
483 list_add_tail(&cm_id_priv->altr_list, &port->cm_priv_altr_list);
484 else
485 ret = -EINVAL;
486
487 spin_unlock_irqrestore(&cm.lock, flags);
488
489 return ret;
490 }
491
492 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
493 {
494 unsigned long flags;
495 int id;
496
497 idr_preload(GFP_KERNEL);
498 spin_lock_irqsave(&cm.lock, flags);
499
500 id = idr_alloc_cyclic(&cm.local_id_table, cm_id_priv, 0, 0, GFP_NOWAIT);
501
502 spin_unlock_irqrestore(&cm.lock, flags);
503 idr_preload_end();
504
505 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
506 return id < 0 ? id : 0;
507 }
508
509 static void cm_free_id(__be32 local_id)
510 {
511 spin_lock_irq(&cm.lock);
512 idr_remove(&cm.local_id_table,
513 (__force int) (local_id ^ cm.random_id_operand));
514 spin_unlock_irq(&cm.lock);
515 }
516
517 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
518 {
519 struct cm_id_private *cm_id_priv;
520
521 cm_id_priv = idr_find(&cm.local_id_table,
522 (__force int) (local_id ^ cm.random_id_operand));
523 if (cm_id_priv) {
524 if (cm_id_priv->id.remote_id == remote_id)
525 atomic_inc(&cm_id_priv->refcount);
526 else
527 cm_id_priv = NULL;
528 }
529
530 return cm_id_priv;
531 }
532
533 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
534 {
535 struct cm_id_private *cm_id_priv;
536
537 spin_lock_irq(&cm.lock);
538 cm_id_priv = cm_get_id(local_id, remote_id);
539 spin_unlock_irq(&cm.lock);
540
541 return cm_id_priv;
542 }
543
544 /*
545 * Trivial helpers to strip endian annotation and compare; the
546 * endianness doesn't actually matter since we just need a stable
547 * order for the RB tree.
548 */
549 static int be32_lt(__be32 a, __be32 b)
550 {
551 return (__force u32) a < (__force u32) b;
552 }
553
554 static int be32_gt(__be32 a, __be32 b)
555 {
556 return (__force u32) a > (__force u32) b;
557 }
558
559 static int be64_lt(__be64 a, __be64 b)
560 {
561 return (__force u64) a < (__force u64) b;
562 }
563
564 static int be64_gt(__be64 a, __be64 b)
565 {
566 return (__force u64) a > (__force u64) b;
567 }
568
569 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
570 {
571 struct rb_node **link = &cm.listen_service_table.rb_node;
572 struct rb_node *parent = NULL;
573 struct cm_id_private *cur_cm_id_priv;
574 __be64 service_id = cm_id_priv->id.service_id;
575 __be64 service_mask = cm_id_priv->id.service_mask;
576
577 while (*link) {
578 parent = *link;
579 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
580 service_node);
581 if ((cur_cm_id_priv->id.service_mask & service_id) ==
582 (service_mask & cur_cm_id_priv->id.service_id) &&
583 (cm_id_priv->id.device == cur_cm_id_priv->id.device))
584 return cur_cm_id_priv;
585
586 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
587 link = &(*link)->rb_left;
588 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
589 link = &(*link)->rb_right;
590 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
591 link = &(*link)->rb_left;
592 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
593 link = &(*link)->rb_right;
594 else
595 link = &(*link)->rb_right;
596 }
597 rb_link_node(&cm_id_priv->service_node, parent, link);
598 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
599 return NULL;
600 }
601
602 static struct cm_id_private * cm_find_listen(struct ib_device *device,
603 __be64 service_id)
604 {
605 struct rb_node *node = cm.listen_service_table.rb_node;
606 struct cm_id_private *cm_id_priv;
607
608 while (node) {
609 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
610 if ((cm_id_priv->id.service_mask & service_id) ==
611 cm_id_priv->id.service_id &&
612 (cm_id_priv->id.device == device))
613 return cm_id_priv;
614
615 if (device < cm_id_priv->id.device)
616 node = node->rb_left;
617 else if (device > cm_id_priv->id.device)
618 node = node->rb_right;
619 else if (be64_lt(service_id, cm_id_priv->id.service_id))
620 node = node->rb_left;
621 else if (be64_gt(service_id, cm_id_priv->id.service_id))
622 node = node->rb_right;
623 else
624 node = node->rb_right;
625 }
626 return NULL;
627 }
628
629 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
630 *timewait_info)
631 {
632 struct rb_node **link = &cm.remote_id_table.rb_node;
633 struct rb_node *parent = NULL;
634 struct cm_timewait_info *cur_timewait_info;
635 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
636 __be32 remote_id = timewait_info->work.remote_id;
637
638 while (*link) {
639 parent = *link;
640 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
641 remote_id_node);
642 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
643 link = &(*link)->rb_left;
644 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
645 link = &(*link)->rb_right;
646 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
647 link = &(*link)->rb_left;
648 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
649 link = &(*link)->rb_right;
650 else
651 return cur_timewait_info;
652 }
653 timewait_info->inserted_remote_id = 1;
654 rb_link_node(&timewait_info->remote_id_node, parent, link);
655 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
656 return NULL;
657 }
658
659 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
660 __be32 remote_id)
661 {
662 struct rb_node *node = cm.remote_id_table.rb_node;
663 struct cm_timewait_info *timewait_info;
664
665 while (node) {
666 timewait_info = rb_entry(node, struct cm_timewait_info,
667 remote_id_node);
668 if (be32_lt(remote_id, timewait_info->work.remote_id))
669 node = node->rb_left;
670 else if (be32_gt(remote_id, timewait_info->work.remote_id))
671 node = node->rb_right;
672 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
673 node = node->rb_left;
674 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
675 node = node->rb_right;
676 else
677 return timewait_info;
678 }
679 return NULL;
680 }
681
682 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
683 *timewait_info)
684 {
685 struct rb_node **link = &cm.remote_qp_table.rb_node;
686 struct rb_node *parent = NULL;
687 struct cm_timewait_info *cur_timewait_info;
688 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
689 __be32 remote_qpn = timewait_info->remote_qpn;
690
691 while (*link) {
692 parent = *link;
693 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
694 remote_qp_node);
695 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
696 link = &(*link)->rb_left;
697 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
698 link = &(*link)->rb_right;
699 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
700 link = &(*link)->rb_left;
701 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
702 link = &(*link)->rb_right;
703 else
704 return cur_timewait_info;
705 }
706 timewait_info->inserted_remote_qp = 1;
707 rb_link_node(&timewait_info->remote_qp_node, parent, link);
708 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
709 return NULL;
710 }
711
712 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
713 *cm_id_priv)
714 {
715 struct rb_node **link = &cm.remote_sidr_table.rb_node;
716 struct rb_node *parent = NULL;
717 struct cm_id_private *cur_cm_id_priv;
718 union ib_gid *port_gid = &cm_id_priv->av.dgid;
719 __be32 remote_id = cm_id_priv->id.remote_id;
720
721 while (*link) {
722 parent = *link;
723 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
724 sidr_id_node);
725 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
726 link = &(*link)->rb_left;
727 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
728 link = &(*link)->rb_right;
729 else {
730 int cmp;
731 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
732 sizeof *port_gid);
733 if (cmp < 0)
734 link = &(*link)->rb_left;
735 else if (cmp > 0)
736 link = &(*link)->rb_right;
737 else
738 return cur_cm_id_priv;
739 }
740 }
741 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
742 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
743 return NULL;
744 }
745
746 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
747 enum ib_cm_sidr_status status)
748 {
749 struct ib_cm_sidr_rep_param param;
750
751 memset(&param, 0, sizeof param);
752 param.status = status;
753 ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
754 }
755
756 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
757 ib_cm_handler cm_handler,
758 void *context)
759 {
760 struct cm_id_private *cm_id_priv;
761 int ret;
762
763 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
764 if (!cm_id_priv)
765 return ERR_PTR(-ENOMEM);
766
767 cm_id_priv->id.state = IB_CM_IDLE;
768 cm_id_priv->id.device = device;
769 cm_id_priv->id.cm_handler = cm_handler;
770 cm_id_priv->id.context = context;
771 cm_id_priv->id.remote_cm_qpn = 1;
772 ret = cm_alloc_id(cm_id_priv);
773 if (ret)
774 goto error;
775
776 spin_lock_init(&cm_id_priv->lock);
777 init_completion(&cm_id_priv->comp);
778 INIT_LIST_HEAD(&cm_id_priv->work_list);
779 INIT_LIST_HEAD(&cm_id_priv->prim_list);
780 INIT_LIST_HEAD(&cm_id_priv->altr_list);
781 atomic_set(&cm_id_priv->work_count, -1);
782 atomic_set(&cm_id_priv->refcount, 1);
783 return &cm_id_priv->id;
784
785 error:
786 kfree(cm_id_priv);
787 return ERR_PTR(-ENOMEM);
788 }
789 EXPORT_SYMBOL(ib_create_cm_id);
790
791 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
792 {
793 struct cm_work *work;
794
795 if (list_empty(&cm_id_priv->work_list))
796 return NULL;
797
798 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
799 list_del(&work->list);
800 return work;
801 }
802
803 static void cm_free_work(struct cm_work *work)
804 {
805 if (work->mad_recv_wc)
806 ib_free_recv_mad(work->mad_recv_wc);
807 kfree(work);
808 }
809
810 static inline int cm_convert_to_ms(int iba_time)
811 {
812 /* approximate conversion to ms from 4.096us x 2^iba_time */
813 return 1 << max(iba_time - 8, 0);
814 }
815
816 /*
817 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
818 * Because of how ack_timeout is stored, adding one doubles the timeout.
819 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
820 * increment it (round up) only if the other is within 50%.
821 */
822 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
823 {
824 int ack_timeout = packet_life_time + 1;
825
826 if (ack_timeout >= ca_ack_delay)
827 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
828 else
829 ack_timeout = ca_ack_delay +
830 (ack_timeout >= (ca_ack_delay - 1));
831
832 return min(31, ack_timeout);
833 }
834
835 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
836 {
837 if (timewait_info->inserted_remote_id) {
838 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
839 timewait_info->inserted_remote_id = 0;
840 }
841
842 if (timewait_info->inserted_remote_qp) {
843 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
844 timewait_info->inserted_remote_qp = 0;
845 }
846 }
847
848 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
849 {
850 struct cm_timewait_info *timewait_info;
851
852 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
853 if (!timewait_info)
854 return ERR_PTR(-ENOMEM);
855
856 timewait_info->work.local_id = local_id;
857 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
858 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
859 return timewait_info;
860 }
861
862 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
863 {
864 int wait_time;
865 unsigned long flags;
866 struct cm_device *cm_dev;
867
868 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client);
869 if (!cm_dev)
870 return;
871
872 spin_lock_irqsave(&cm.lock, flags);
873 cm_cleanup_timewait(cm_id_priv->timewait_info);
874 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
875 spin_unlock_irqrestore(&cm.lock, flags);
876
877 /*
878 * The cm_id could be destroyed by the user before we exit timewait.
879 * To protect against this, we search for the cm_id after exiting
880 * timewait before notifying the user that we've exited timewait.
881 */
882 cm_id_priv->id.state = IB_CM_TIMEWAIT;
883 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
884
885 /* Check if the device started its remove_one */
886 spin_lock_irqsave(&cm.lock, flags);
887 if (!cm_dev->going_down)
888 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
889 msecs_to_jiffies(wait_time));
890 spin_unlock_irqrestore(&cm.lock, flags);
891
892 cm_id_priv->timewait_info = NULL;
893 }
894
895 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
896 {
897 unsigned long flags;
898
899 cm_id_priv->id.state = IB_CM_IDLE;
900 if (cm_id_priv->timewait_info) {
901 spin_lock_irqsave(&cm.lock, flags);
902 cm_cleanup_timewait(cm_id_priv->timewait_info);
903 spin_unlock_irqrestore(&cm.lock, flags);
904 kfree(cm_id_priv->timewait_info);
905 cm_id_priv->timewait_info = NULL;
906 }
907 }
908
909 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
910 {
911 struct cm_id_private *cm_id_priv;
912 struct cm_work *work;
913
914 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
915 retest:
916 spin_lock_irq(&cm_id_priv->lock);
917 switch (cm_id->state) {
918 case IB_CM_LISTEN:
919 spin_unlock_irq(&cm_id_priv->lock);
920
921 spin_lock_irq(&cm.lock);
922 if (--cm_id_priv->listen_sharecount > 0) {
923 /* The id is still shared. */
924 cm_deref_id(cm_id_priv);
925 spin_unlock_irq(&cm.lock);
926 return;
927 }
928 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
929 spin_unlock_irq(&cm.lock);
930 break;
931 case IB_CM_SIDR_REQ_SENT:
932 cm_id->state = IB_CM_IDLE;
933 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
934 spin_unlock_irq(&cm_id_priv->lock);
935 break;
936 case IB_CM_SIDR_REQ_RCVD:
937 spin_unlock_irq(&cm_id_priv->lock);
938 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
939 spin_lock_irq(&cm.lock);
940 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node))
941 rb_erase(&cm_id_priv->sidr_id_node,
942 &cm.remote_sidr_table);
943 spin_unlock_irq(&cm.lock);
944 break;
945 case IB_CM_REQ_SENT:
946 case IB_CM_MRA_REQ_RCVD:
947 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
948 spin_unlock_irq(&cm_id_priv->lock);
949 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
950 &cm_id_priv->id.device->node_guid,
951 sizeof cm_id_priv->id.device->node_guid,
952 NULL, 0);
953 break;
954 case IB_CM_REQ_RCVD:
955 if (err == -ENOMEM) {
956 /* Do not reject to allow future retries. */
957 cm_reset_to_idle(cm_id_priv);
958 spin_unlock_irq(&cm_id_priv->lock);
959 } else {
960 spin_unlock_irq(&cm_id_priv->lock);
961 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
962 NULL, 0, NULL, 0);
963 }
964 break;
965 case IB_CM_REP_SENT:
966 case IB_CM_MRA_REP_RCVD:
967 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
968 /* Fall through */
969 case IB_CM_MRA_REQ_SENT:
970 case IB_CM_REP_RCVD:
971 case IB_CM_MRA_REP_SENT:
972 spin_unlock_irq(&cm_id_priv->lock);
973 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
974 NULL, 0, NULL, 0);
975 break;
976 case IB_CM_ESTABLISHED:
977 spin_unlock_irq(&cm_id_priv->lock);
978 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT)
979 break;
980 ib_send_cm_dreq(cm_id, NULL, 0);
981 goto retest;
982 case IB_CM_DREQ_SENT:
983 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
984 cm_enter_timewait(cm_id_priv);
985 spin_unlock_irq(&cm_id_priv->lock);
986 break;
987 case IB_CM_DREQ_RCVD:
988 spin_unlock_irq(&cm_id_priv->lock);
989 ib_send_cm_drep(cm_id, NULL, 0);
990 break;
991 default:
992 spin_unlock_irq(&cm_id_priv->lock);
993 break;
994 }
995
996 spin_lock_irq(&cm.lock);
997 if (!list_empty(&cm_id_priv->altr_list) &&
998 (!cm_id_priv->altr_send_port_not_ready))
999 list_del(&cm_id_priv->altr_list);
1000 if (!list_empty(&cm_id_priv->prim_list) &&
1001 (!cm_id_priv->prim_send_port_not_ready))
1002 list_del(&cm_id_priv->prim_list);
1003 spin_unlock_irq(&cm.lock);
1004
1005 cm_free_id(cm_id->local_id);
1006 cm_deref_id(cm_id_priv);
1007 wait_for_completion(&cm_id_priv->comp);
1008 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
1009 cm_free_work(work);
1010 kfree(cm_id_priv->private_data);
1011 kfree(cm_id_priv);
1012 }
1013
1014 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
1015 {
1016 cm_destroy_id(cm_id, 0);
1017 }
1018 EXPORT_SYMBOL(ib_destroy_cm_id);
1019
1020 /**
1021 * __ib_cm_listen - Initiates listening on the specified service ID for
1022 * connection and service ID resolution requests.
1023 * @cm_id: Connection identifier associated with the listen request.
1024 * @service_id: Service identifier matched against incoming connection
1025 * and service ID resolution requests. The service ID should be specified
1026 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1027 * assign a service ID to the caller.
1028 * @service_mask: Mask applied to service ID used to listen across a
1029 * range of service IDs. If set to 0, the service ID is matched
1030 * exactly. This parameter is ignored if %service_id is set to
1031 * IB_CM_ASSIGN_SERVICE_ID.
1032 */
1033 static int __ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id,
1034 __be64 service_mask)
1035 {
1036 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
1037 int ret = 0;
1038
1039 service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
1040 service_id &= service_mask;
1041 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
1042 (service_id != IB_CM_ASSIGN_SERVICE_ID))
1043 return -EINVAL;
1044
1045 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1046 if (cm_id->state != IB_CM_IDLE)
1047 return -EINVAL;
1048
1049 cm_id->state = IB_CM_LISTEN;
1050 ++cm_id_priv->listen_sharecount;
1051
1052 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
1053 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
1054 cm_id->service_mask = ~cpu_to_be64(0);
1055 } else {
1056 cm_id->service_id = service_id;
1057 cm_id->service_mask = service_mask;
1058 }
1059 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
1060
1061 if (cur_cm_id_priv) {
1062 cm_id->state = IB_CM_IDLE;
1063 --cm_id_priv->listen_sharecount;
1064 ret = -EBUSY;
1065 }
1066 return ret;
1067 }
1068
1069 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask)
1070 {
1071 unsigned long flags;
1072 int ret;
1073
1074 spin_lock_irqsave(&cm.lock, flags);
1075 ret = __ib_cm_listen(cm_id, service_id, service_mask);
1076 spin_unlock_irqrestore(&cm.lock, flags);
1077
1078 return ret;
1079 }
1080 EXPORT_SYMBOL(ib_cm_listen);
1081
1082 /**
1083 * Create a new listening ib_cm_id and listen on the given service ID.
1084 *
1085 * If there's an existing ID listening on that same device and service ID,
1086 * return it.
1087 *
1088 * @device: Device associated with the cm_id. All related communication will
1089 * be associated with the specified device.
1090 * @cm_handler: Callback invoked to notify the user of CM events.
1091 * @service_id: Service identifier matched against incoming connection
1092 * and service ID resolution requests. The service ID should be specified
1093 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1094 * assign a service ID to the caller.
1095 *
1096 * Callers should call ib_destroy_cm_id when done with the listener ID.
1097 */
1098 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device,
1099 ib_cm_handler cm_handler,
1100 __be64 service_id)
1101 {
1102 struct cm_id_private *cm_id_priv;
1103 struct ib_cm_id *cm_id;
1104 unsigned long flags;
1105 int err = 0;
1106
1107 /* Create an ID in advance, since the creation may sleep */
1108 cm_id = ib_create_cm_id(device, cm_handler, NULL);
1109 if (IS_ERR(cm_id))
1110 return cm_id;
1111
1112 spin_lock_irqsave(&cm.lock, flags);
1113
1114 if (service_id == IB_CM_ASSIGN_SERVICE_ID)
1115 goto new_id;
1116
1117 /* Find an existing ID */
1118 cm_id_priv = cm_find_listen(device, service_id);
1119 if (cm_id_priv) {
1120 if (cm_id->cm_handler != cm_handler || cm_id->context) {
1121 /* Sharing an ib_cm_id with different handlers is not
1122 * supported */
1123 spin_unlock_irqrestore(&cm.lock, flags);
1124 return ERR_PTR(-EINVAL);
1125 }
1126 atomic_inc(&cm_id_priv->refcount);
1127 ++cm_id_priv->listen_sharecount;
1128 spin_unlock_irqrestore(&cm.lock, flags);
1129
1130 ib_destroy_cm_id(cm_id);
1131 cm_id = &cm_id_priv->id;
1132 return cm_id;
1133 }
1134
1135 new_id:
1136 /* Use newly created ID */
1137 err = __ib_cm_listen(cm_id, service_id, 0);
1138
1139 spin_unlock_irqrestore(&cm.lock, flags);
1140
1141 if (err) {
1142 ib_destroy_cm_id(cm_id);
1143 return ERR_PTR(err);
1144 }
1145 return cm_id;
1146 }
1147 EXPORT_SYMBOL(ib_cm_insert_listen);
1148
1149 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
1150 enum cm_msg_sequence msg_seq)
1151 {
1152 u64 hi_tid, low_tid;
1153
1154 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
1155 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
1156 (msg_seq << 30));
1157 return cpu_to_be64(hi_tid | low_tid);
1158 }
1159
1160 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
1161 __be16 attr_id, __be64 tid)
1162 {
1163 hdr->base_version = IB_MGMT_BASE_VERSION;
1164 hdr->mgmt_class = IB_MGMT_CLASS_CM;
1165 hdr->class_version = IB_CM_CLASS_VERSION;
1166 hdr->method = IB_MGMT_METHOD_SEND;
1167 hdr->attr_id = attr_id;
1168 hdr->tid = tid;
1169 }
1170
1171 static void cm_format_req(struct cm_req_msg *req_msg,
1172 struct cm_id_private *cm_id_priv,
1173 struct ib_cm_req_param *param)
1174 {
1175 struct ib_sa_path_rec *pri_path = param->primary_path;
1176 struct ib_sa_path_rec *alt_path = param->alternate_path;
1177
1178 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1179 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
1180
1181 req_msg->local_comm_id = cm_id_priv->id.local_id;
1182 req_msg->service_id = param->service_id;
1183 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1184 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
1185 cm_req_set_init_depth(req_msg, param->initiator_depth);
1186 cm_req_set_remote_resp_timeout(req_msg,
1187 param->remote_cm_response_timeout);
1188 cm_req_set_qp_type(req_msg, param->qp_type);
1189 cm_req_set_flow_ctrl(req_msg, param->flow_control);
1190 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
1191 cm_req_set_local_resp_timeout(req_msg,
1192 param->local_cm_response_timeout);
1193 req_msg->pkey = param->primary_path->pkey;
1194 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
1195 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
1196
1197 if (param->qp_type != IB_QPT_XRC_INI) {
1198 cm_req_set_resp_res(req_msg, param->responder_resources);
1199 cm_req_set_retry_count(req_msg, param->retry_count);
1200 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
1201 cm_req_set_srq(req_msg, param->srq);
1202 }
1203
1204 if (pri_path->hop_limit <= 1) {
1205 req_msg->primary_local_lid = pri_path->slid;
1206 req_msg->primary_remote_lid = pri_path->dlid;
1207 } else {
1208 /* Work-around until there's a way to obtain remote LID info */
1209 req_msg->primary_local_lid = IB_LID_PERMISSIVE;
1210 req_msg->primary_remote_lid = IB_LID_PERMISSIVE;
1211 }
1212 req_msg->primary_local_gid = pri_path->sgid;
1213 req_msg->primary_remote_gid = pri_path->dgid;
1214 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label);
1215 cm_req_set_primary_packet_rate(req_msg, pri_path->rate);
1216 req_msg->primary_traffic_class = pri_path->traffic_class;
1217 req_msg->primary_hop_limit = pri_path->hop_limit;
1218 cm_req_set_primary_sl(req_msg, pri_path->sl);
1219 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1));
1220 cm_req_set_primary_local_ack_timeout(req_msg,
1221 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1222 pri_path->packet_life_time));
1223
1224 if (alt_path) {
1225 if (alt_path->hop_limit <= 1) {
1226 req_msg->alt_local_lid = alt_path->slid;
1227 req_msg->alt_remote_lid = alt_path->dlid;
1228 } else {
1229 req_msg->alt_local_lid = IB_LID_PERMISSIVE;
1230 req_msg->alt_remote_lid = IB_LID_PERMISSIVE;
1231 }
1232 req_msg->alt_local_gid = alt_path->sgid;
1233 req_msg->alt_remote_gid = alt_path->dgid;
1234 cm_req_set_alt_flow_label(req_msg,
1235 alt_path->flow_label);
1236 cm_req_set_alt_packet_rate(req_msg, alt_path->rate);
1237 req_msg->alt_traffic_class = alt_path->traffic_class;
1238 req_msg->alt_hop_limit = alt_path->hop_limit;
1239 cm_req_set_alt_sl(req_msg, alt_path->sl);
1240 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1));
1241 cm_req_set_alt_local_ack_timeout(req_msg,
1242 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1243 alt_path->packet_life_time));
1244 }
1245
1246 if (param->private_data && param->private_data_len)
1247 memcpy(req_msg->private_data, param->private_data,
1248 param->private_data_len);
1249 }
1250
1251 static int cm_validate_req_param(struct ib_cm_req_param *param)
1252 {
1253 /* peer-to-peer not supported */
1254 if (param->peer_to_peer)
1255 return -EINVAL;
1256
1257 if (!param->primary_path)
1258 return -EINVAL;
1259
1260 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
1261 param->qp_type != IB_QPT_XRC_INI)
1262 return -EINVAL;
1263
1264 if (param->private_data &&
1265 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1266 return -EINVAL;
1267
1268 if (param->alternate_path &&
1269 (param->alternate_path->pkey != param->primary_path->pkey ||
1270 param->alternate_path->mtu != param->primary_path->mtu))
1271 return -EINVAL;
1272
1273 return 0;
1274 }
1275
1276 int ib_send_cm_req(struct ib_cm_id *cm_id,
1277 struct ib_cm_req_param *param)
1278 {
1279 struct cm_id_private *cm_id_priv;
1280 struct cm_req_msg *req_msg;
1281 unsigned long flags;
1282 int ret;
1283
1284 ret = cm_validate_req_param(param);
1285 if (ret)
1286 return ret;
1287
1288 /* Verify that we're not in timewait. */
1289 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1290 spin_lock_irqsave(&cm_id_priv->lock, flags);
1291 if (cm_id->state != IB_CM_IDLE) {
1292 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1293 ret = -EINVAL;
1294 goto out;
1295 }
1296 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1297
1298 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1299 id.local_id);
1300 if (IS_ERR(cm_id_priv->timewait_info)) {
1301 ret = PTR_ERR(cm_id_priv->timewait_info);
1302 goto out;
1303 }
1304
1305 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av,
1306 cm_id_priv);
1307 if (ret)
1308 goto error1;
1309 if (param->alternate_path) {
1310 ret = cm_init_av_by_path(param->alternate_path,
1311 &cm_id_priv->alt_av, cm_id_priv);
1312 if (ret)
1313 goto error1;
1314 }
1315 cm_id->service_id = param->service_id;
1316 cm_id->service_mask = ~cpu_to_be64(0);
1317 cm_id_priv->timeout_ms = cm_convert_to_ms(
1318 param->primary_path->packet_life_time) * 2 +
1319 cm_convert_to_ms(
1320 param->remote_cm_response_timeout);
1321 cm_id_priv->max_cm_retries = param->max_cm_retries;
1322 cm_id_priv->initiator_depth = param->initiator_depth;
1323 cm_id_priv->responder_resources = param->responder_resources;
1324 cm_id_priv->retry_count = param->retry_count;
1325 cm_id_priv->path_mtu = param->primary_path->mtu;
1326 cm_id_priv->pkey = param->primary_path->pkey;
1327 cm_id_priv->qp_type = param->qp_type;
1328
1329 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1330 if (ret)
1331 goto error1;
1332
1333 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1334 cm_format_req(req_msg, cm_id_priv, param);
1335 cm_id_priv->tid = req_msg->hdr.tid;
1336 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1337 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1338
1339 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1340 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1341
1342 spin_lock_irqsave(&cm_id_priv->lock, flags);
1343 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1344 if (ret) {
1345 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1346 goto error2;
1347 }
1348 BUG_ON(cm_id->state != IB_CM_IDLE);
1349 cm_id->state = IB_CM_REQ_SENT;
1350 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1351 return 0;
1352
1353 error2: cm_free_msg(cm_id_priv->msg);
1354 error1: kfree(cm_id_priv->timewait_info);
1355 out: return ret;
1356 }
1357 EXPORT_SYMBOL(ib_send_cm_req);
1358
1359 static int cm_issue_rej(struct cm_port *port,
1360 struct ib_mad_recv_wc *mad_recv_wc,
1361 enum ib_cm_rej_reason reason,
1362 enum cm_msg_response msg_rejected,
1363 void *ari, u8 ari_length)
1364 {
1365 struct ib_mad_send_buf *msg = NULL;
1366 struct cm_rej_msg *rej_msg, *rcv_msg;
1367 int ret;
1368
1369 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1370 if (ret)
1371 return ret;
1372
1373 /* We just need common CM header information. Cast to any message. */
1374 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1375 rej_msg = (struct cm_rej_msg *) msg->mad;
1376
1377 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1378 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1379 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1380 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1381 rej_msg->reason = cpu_to_be16(reason);
1382
1383 if (ari && ari_length) {
1384 cm_rej_set_reject_info_len(rej_msg, ari_length);
1385 memcpy(rej_msg->ari, ari, ari_length);
1386 }
1387
1388 ret = ib_post_send_mad(msg, NULL);
1389 if (ret)
1390 cm_free_msg(msg);
1391
1392 return ret;
1393 }
1394
1395 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1396 __be32 local_qpn, __be32 remote_qpn)
1397 {
1398 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1399 ((local_ca_guid == remote_ca_guid) &&
1400 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1401 }
1402
1403 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1404 struct ib_sa_path_rec *primary_path,
1405 struct ib_sa_path_rec *alt_path)
1406 {
1407 memset(primary_path, 0, sizeof *primary_path);
1408 primary_path->dgid = req_msg->primary_local_gid;
1409 primary_path->sgid = req_msg->primary_remote_gid;
1410 primary_path->dlid = req_msg->primary_local_lid;
1411 primary_path->slid = req_msg->primary_remote_lid;
1412 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1413 primary_path->hop_limit = req_msg->primary_hop_limit;
1414 primary_path->traffic_class = req_msg->primary_traffic_class;
1415 primary_path->reversible = 1;
1416 primary_path->pkey = req_msg->pkey;
1417 primary_path->sl = cm_req_get_primary_sl(req_msg);
1418 primary_path->mtu_selector = IB_SA_EQ;
1419 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1420 primary_path->rate_selector = IB_SA_EQ;
1421 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1422 primary_path->packet_life_time_selector = IB_SA_EQ;
1423 primary_path->packet_life_time =
1424 cm_req_get_primary_local_ack_timeout(req_msg);
1425 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1426 primary_path->service_id = req_msg->service_id;
1427
1428 if (req_msg->alt_local_lid) {
1429 memset(alt_path, 0, sizeof *alt_path);
1430 alt_path->dgid = req_msg->alt_local_gid;
1431 alt_path->sgid = req_msg->alt_remote_gid;
1432 alt_path->dlid = req_msg->alt_local_lid;
1433 alt_path->slid = req_msg->alt_remote_lid;
1434 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1435 alt_path->hop_limit = req_msg->alt_hop_limit;
1436 alt_path->traffic_class = req_msg->alt_traffic_class;
1437 alt_path->reversible = 1;
1438 alt_path->pkey = req_msg->pkey;
1439 alt_path->sl = cm_req_get_alt_sl(req_msg);
1440 alt_path->mtu_selector = IB_SA_EQ;
1441 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1442 alt_path->rate_selector = IB_SA_EQ;
1443 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1444 alt_path->packet_life_time_selector = IB_SA_EQ;
1445 alt_path->packet_life_time =
1446 cm_req_get_alt_local_ack_timeout(req_msg);
1447 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1448 alt_path->service_id = req_msg->service_id;
1449 }
1450 }
1451
1452 static u16 cm_get_bth_pkey(struct cm_work *work)
1453 {
1454 struct ib_device *ib_dev = work->port->cm_dev->ib_device;
1455 u8 port_num = work->port->port_num;
1456 u16 pkey_index = work->mad_recv_wc->wc->pkey_index;
1457 u16 pkey;
1458 int ret;
1459
1460 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey);
1461 if (ret) {
1462 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n",
1463 port_num, pkey_index, ret);
1464 return 0;
1465 }
1466
1467 return pkey;
1468 }
1469
1470 static void cm_format_req_event(struct cm_work *work,
1471 struct cm_id_private *cm_id_priv,
1472 struct ib_cm_id *listen_id)
1473 {
1474 struct cm_req_msg *req_msg;
1475 struct ib_cm_req_event_param *param;
1476
1477 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1478 param = &work->cm_event.param.req_rcvd;
1479 param->listen_id = listen_id;
1480 param->bth_pkey = cm_get_bth_pkey(work);
1481 param->port = cm_id_priv->av.port->port_num;
1482 param->primary_path = &work->path[0];
1483 if (req_msg->alt_local_lid)
1484 param->alternate_path = &work->path[1];
1485 else
1486 param->alternate_path = NULL;
1487 param->remote_ca_guid = req_msg->local_ca_guid;
1488 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1489 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1490 param->qp_type = cm_req_get_qp_type(req_msg);
1491 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1492 param->responder_resources = cm_req_get_init_depth(req_msg);
1493 param->initiator_depth = cm_req_get_resp_res(req_msg);
1494 param->local_cm_response_timeout =
1495 cm_req_get_remote_resp_timeout(req_msg);
1496 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1497 param->remote_cm_response_timeout =
1498 cm_req_get_local_resp_timeout(req_msg);
1499 param->retry_count = cm_req_get_retry_count(req_msg);
1500 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1501 param->srq = cm_req_get_srq(req_msg);
1502 work->cm_event.private_data = &req_msg->private_data;
1503 }
1504
1505 static void cm_process_work(struct cm_id_private *cm_id_priv,
1506 struct cm_work *work)
1507 {
1508 int ret;
1509
1510 /* We will typically only have the current event to report. */
1511 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1512 cm_free_work(work);
1513
1514 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1515 spin_lock_irq(&cm_id_priv->lock);
1516 work = cm_dequeue_work(cm_id_priv);
1517 spin_unlock_irq(&cm_id_priv->lock);
1518 BUG_ON(!work);
1519 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1520 &work->cm_event);
1521 cm_free_work(work);
1522 }
1523 cm_deref_id(cm_id_priv);
1524 if (ret)
1525 cm_destroy_id(&cm_id_priv->id, ret);
1526 }
1527
1528 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1529 struct cm_id_private *cm_id_priv,
1530 enum cm_msg_response msg_mraed, u8 service_timeout,
1531 const void *private_data, u8 private_data_len)
1532 {
1533 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1534 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1535 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1536 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1537 cm_mra_set_service_timeout(mra_msg, service_timeout);
1538
1539 if (private_data && private_data_len)
1540 memcpy(mra_msg->private_data, private_data, private_data_len);
1541 }
1542
1543 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1544 struct cm_id_private *cm_id_priv,
1545 enum ib_cm_rej_reason reason,
1546 void *ari,
1547 u8 ari_length,
1548 const void *private_data,
1549 u8 private_data_len)
1550 {
1551 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1552 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1553
1554 switch(cm_id_priv->id.state) {
1555 case IB_CM_REQ_RCVD:
1556 rej_msg->local_comm_id = 0;
1557 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1558 break;
1559 case IB_CM_MRA_REQ_SENT:
1560 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1561 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1562 break;
1563 case IB_CM_REP_RCVD:
1564 case IB_CM_MRA_REP_SENT:
1565 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1566 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1567 break;
1568 default:
1569 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1570 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1571 break;
1572 }
1573
1574 rej_msg->reason = cpu_to_be16(reason);
1575 if (ari && ari_length) {
1576 cm_rej_set_reject_info_len(rej_msg, ari_length);
1577 memcpy(rej_msg->ari, ari, ari_length);
1578 }
1579
1580 if (private_data && private_data_len)
1581 memcpy(rej_msg->private_data, private_data, private_data_len);
1582 }
1583
1584 static void cm_dup_req_handler(struct cm_work *work,
1585 struct cm_id_private *cm_id_priv)
1586 {
1587 struct ib_mad_send_buf *msg = NULL;
1588 int ret;
1589
1590 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1591 counter[CM_REQ_COUNTER]);
1592
1593 /* Quick state check to discard duplicate REQs. */
1594 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1595 return;
1596
1597 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1598 if (ret)
1599 return;
1600
1601 spin_lock_irq(&cm_id_priv->lock);
1602 switch (cm_id_priv->id.state) {
1603 case IB_CM_MRA_REQ_SENT:
1604 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1605 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1606 cm_id_priv->private_data,
1607 cm_id_priv->private_data_len);
1608 break;
1609 case IB_CM_TIMEWAIT:
1610 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1611 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1612 break;
1613 default:
1614 goto unlock;
1615 }
1616 spin_unlock_irq(&cm_id_priv->lock);
1617
1618 ret = ib_post_send_mad(msg, NULL);
1619 if (ret)
1620 goto free;
1621 return;
1622
1623 unlock: spin_unlock_irq(&cm_id_priv->lock);
1624 free: cm_free_msg(msg);
1625 }
1626
1627 static struct cm_id_private * cm_match_req(struct cm_work *work,
1628 struct cm_id_private *cm_id_priv)
1629 {
1630 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1631 struct cm_timewait_info *timewait_info;
1632 struct cm_req_msg *req_msg;
1633 struct ib_cm_id *cm_id;
1634
1635 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1636
1637 /* Check for possible duplicate REQ. */
1638 spin_lock_irq(&cm.lock);
1639 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1640 if (timewait_info) {
1641 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1642 timewait_info->work.remote_id);
1643 spin_unlock_irq(&cm.lock);
1644 if (cur_cm_id_priv) {
1645 cm_dup_req_handler(work, cur_cm_id_priv);
1646 cm_deref_id(cur_cm_id_priv);
1647 }
1648 return NULL;
1649 }
1650
1651 /* Check for stale connections. */
1652 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1653 if (timewait_info) {
1654 cm_cleanup_timewait(cm_id_priv->timewait_info);
1655 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1656 timewait_info->work.remote_id);
1657
1658 spin_unlock_irq(&cm.lock);
1659 cm_issue_rej(work->port, work->mad_recv_wc,
1660 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1661 NULL, 0);
1662 if (cur_cm_id_priv) {
1663 cm_id = &cur_cm_id_priv->id;
1664 ib_send_cm_dreq(cm_id, NULL, 0);
1665 cm_deref_id(cur_cm_id_priv);
1666 }
1667 return NULL;
1668 }
1669
1670 /* Find matching listen request. */
1671 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1672 req_msg->service_id);
1673 if (!listen_cm_id_priv) {
1674 cm_cleanup_timewait(cm_id_priv->timewait_info);
1675 spin_unlock_irq(&cm.lock);
1676 cm_issue_rej(work->port, work->mad_recv_wc,
1677 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1678 NULL, 0);
1679 goto out;
1680 }
1681 atomic_inc(&listen_cm_id_priv->refcount);
1682 atomic_inc(&cm_id_priv->refcount);
1683 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1684 atomic_inc(&cm_id_priv->work_count);
1685 spin_unlock_irq(&cm.lock);
1686 out:
1687 return listen_cm_id_priv;
1688 }
1689
1690 /*
1691 * Work-around for inter-subnet connections. If the LIDs are permissive,
1692 * we need to override the LID/SL data in the REQ with the LID information
1693 * in the work completion.
1694 */
1695 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
1696 {
1697 if (!cm_req_get_primary_subnet_local(req_msg)) {
1698 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) {
1699 req_msg->primary_local_lid = cpu_to_be16(wc->slid);
1700 cm_req_set_primary_sl(req_msg, wc->sl);
1701 }
1702
1703 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE)
1704 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1705 }
1706
1707 if (!cm_req_get_alt_subnet_local(req_msg)) {
1708 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) {
1709 req_msg->alt_local_lid = cpu_to_be16(wc->slid);
1710 cm_req_set_alt_sl(req_msg, wc->sl);
1711 }
1712
1713 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE)
1714 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1715 }
1716 }
1717
1718 static int cm_req_handler(struct cm_work *work)
1719 {
1720 struct ib_cm_id *cm_id;
1721 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1722 struct cm_req_msg *req_msg;
1723 union ib_gid gid;
1724 struct ib_gid_attr gid_attr;
1725 int ret;
1726
1727 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1728
1729 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
1730 if (IS_ERR(cm_id))
1731 return PTR_ERR(cm_id);
1732
1733 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1734 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1735 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1736 work->mad_recv_wc->recv_buf.grh,
1737 &cm_id_priv->av);
1738 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1739 id.local_id);
1740 if (IS_ERR(cm_id_priv->timewait_info)) {
1741 ret = PTR_ERR(cm_id_priv->timewait_info);
1742 goto destroy;
1743 }
1744 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1745 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1746 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1747
1748 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1749 if (!listen_cm_id_priv) {
1750 ret = -EINVAL;
1751 kfree(cm_id_priv->timewait_info);
1752 goto destroy;
1753 }
1754
1755 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1756 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1757 cm_id_priv->id.service_id = req_msg->service_id;
1758 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
1759
1760 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
1761 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1762
1763 memcpy(work->path[0].dmac, cm_id_priv->av.ah_attr.dmac, ETH_ALEN);
1764 work->path[0].hop_limit = cm_id_priv->av.ah_attr.grh.hop_limit;
1765 ret = ib_get_cached_gid(work->port->cm_dev->ib_device,
1766 work->port->port_num,
1767 cm_id_priv->av.ah_attr.grh.sgid_index,
1768 &gid, &gid_attr);
1769 if (!ret) {
1770 if (gid_attr.ndev) {
1771 work->path[0].ifindex = gid_attr.ndev->ifindex;
1772 work->path[0].net = dev_net(gid_attr.ndev);
1773 dev_put(gid_attr.ndev);
1774 }
1775 work->path[0].gid_type = gid_attr.gid_type;
1776 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av,
1777 cm_id_priv);
1778 }
1779 if (ret) {
1780 int err = ib_get_cached_gid(work->port->cm_dev->ib_device,
1781 work->port->port_num, 0,
1782 &work->path[0].sgid,
1783 &gid_attr);
1784 if (!err && gid_attr.ndev) {
1785 work->path[0].ifindex = gid_attr.ndev->ifindex;
1786 work->path[0].net = dev_net(gid_attr.ndev);
1787 dev_put(gid_attr.ndev);
1788 }
1789 work->path[0].gid_type = gid_attr.gid_type;
1790 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1791 &work->path[0].sgid, sizeof work->path[0].sgid,
1792 NULL, 0);
1793 goto rejected;
1794 }
1795 if (req_msg->alt_local_lid) {
1796 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av,
1797 cm_id_priv);
1798 if (ret) {
1799 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1800 &work->path[0].sgid,
1801 sizeof work->path[0].sgid, NULL, 0);
1802 goto rejected;
1803 }
1804 }
1805 cm_id_priv->tid = req_msg->hdr.tid;
1806 cm_id_priv->timeout_ms = cm_convert_to_ms(
1807 cm_req_get_local_resp_timeout(req_msg));
1808 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1809 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1810 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1811 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1812 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1813 cm_id_priv->pkey = req_msg->pkey;
1814 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1815 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1816 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1817 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1818
1819 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1820 cm_process_work(cm_id_priv, work);
1821 cm_deref_id(listen_cm_id_priv);
1822 return 0;
1823
1824 rejected:
1825 atomic_dec(&cm_id_priv->refcount);
1826 cm_deref_id(listen_cm_id_priv);
1827 destroy:
1828 ib_destroy_cm_id(cm_id);
1829 return ret;
1830 }
1831
1832 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1833 struct cm_id_private *cm_id_priv,
1834 struct ib_cm_rep_param *param)
1835 {
1836 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1837 rep_msg->local_comm_id = cm_id_priv->id.local_id;
1838 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1839 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1840 rep_msg->resp_resources = param->responder_resources;
1841 cm_rep_set_target_ack_delay(rep_msg,
1842 cm_id_priv->av.port->cm_dev->ack_delay);
1843 cm_rep_set_failover(rep_msg, param->failover_accepted);
1844 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1845 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1846
1847 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
1848 rep_msg->initiator_depth = param->initiator_depth;
1849 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1850 cm_rep_set_srq(rep_msg, param->srq);
1851 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1852 } else {
1853 cm_rep_set_srq(rep_msg, 1);
1854 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num));
1855 }
1856
1857 if (param->private_data && param->private_data_len)
1858 memcpy(rep_msg->private_data, param->private_data,
1859 param->private_data_len);
1860 }
1861
1862 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1863 struct ib_cm_rep_param *param)
1864 {
1865 struct cm_id_private *cm_id_priv;
1866 struct ib_mad_send_buf *msg;
1867 struct cm_rep_msg *rep_msg;
1868 unsigned long flags;
1869 int ret;
1870
1871 if (param->private_data &&
1872 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1873 return -EINVAL;
1874
1875 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1876 spin_lock_irqsave(&cm_id_priv->lock, flags);
1877 if (cm_id->state != IB_CM_REQ_RCVD &&
1878 cm_id->state != IB_CM_MRA_REQ_SENT) {
1879 ret = -EINVAL;
1880 goto out;
1881 }
1882
1883 ret = cm_alloc_msg(cm_id_priv, &msg);
1884 if (ret)
1885 goto out;
1886
1887 rep_msg = (struct cm_rep_msg *) msg->mad;
1888 cm_format_rep(rep_msg, cm_id_priv, param);
1889 msg->timeout_ms = cm_id_priv->timeout_ms;
1890 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1891
1892 ret = ib_post_send_mad(msg, NULL);
1893 if (ret) {
1894 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1895 cm_free_msg(msg);
1896 return ret;
1897 }
1898
1899 cm_id->state = IB_CM_REP_SENT;
1900 cm_id_priv->msg = msg;
1901 cm_id_priv->initiator_depth = param->initiator_depth;
1902 cm_id_priv->responder_resources = param->responder_resources;
1903 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1904 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
1905
1906 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1907 return ret;
1908 }
1909 EXPORT_SYMBOL(ib_send_cm_rep);
1910
1911 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1912 struct cm_id_private *cm_id_priv,
1913 const void *private_data,
1914 u8 private_data_len)
1915 {
1916 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1917 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1918 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1919
1920 if (private_data && private_data_len)
1921 memcpy(rtu_msg->private_data, private_data, private_data_len);
1922 }
1923
1924 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1925 const void *private_data,
1926 u8 private_data_len)
1927 {
1928 struct cm_id_private *cm_id_priv;
1929 struct ib_mad_send_buf *msg;
1930 unsigned long flags;
1931 void *data;
1932 int ret;
1933
1934 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1935 return -EINVAL;
1936
1937 data = cm_copy_private_data(private_data, private_data_len);
1938 if (IS_ERR(data))
1939 return PTR_ERR(data);
1940
1941 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1942 spin_lock_irqsave(&cm_id_priv->lock, flags);
1943 if (cm_id->state != IB_CM_REP_RCVD &&
1944 cm_id->state != IB_CM_MRA_REP_SENT) {
1945 ret = -EINVAL;
1946 goto error;
1947 }
1948
1949 ret = cm_alloc_msg(cm_id_priv, &msg);
1950 if (ret)
1951 goto error;
1952
1953 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1954 private_data, private_data_len);
1955
1956 ret = ib_post_send_mad(msg, NULL);
1957 if (ret) {
1958 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1959 cm_free_msg(msg);
1960 kfree(data);
1961 return ret;
1962 }
1963
1964 cm_id->state = IB_CM_ESTABLISHED;
1965 cm_set_private_data(cm_id_priv, data, private_data_len);
1966 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1967 return 0;
1968
1969 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1970 kfree(data);
1971 return ret;
1972 }
1973 EXPORT_SYMBOL(ib_send_cm_rtu);
1974
1975 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
1976 {
1977 struct cm_rep_msg *rep_msg;
1978 struct ib_cm_rep_event_param *param;
1979
1980 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1981 param = &work->cm_event.param.rep_rcvd;
1982 param->remote_ca_guid = rep_msg->local_ca_guid;
1983 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1984 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
1985 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1986 param->responder_resources = rep_msg->initiator_depth;
1987 param->initiator_depth = rep_msg->resp_resources;
1988 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1989 param->failover_accepted = cm_rep_get_failover(rep_msg);
1990 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1991 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1992 param->srq = cm_rep_get_srq(rep_msg);
1993 work->cm_event.private_data = &rep_msg->private_data;
1994 }
1995
1996 static void cm_dup_rep_handler(struct cm_work *work)
1997 {
1998 struct cm_id_private *cm_id_priv;
1999 struct cm_rep_msg *rep_msg;
2000 struct ib_mad_send_buf *msg = NULL;
2001 int ret;
2002
2003 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
2004 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
2005 rep_msg->local_comm_id);
2006 if (!cm_id_priv)
2007 return;
2008
2009 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2010 counter[CM_REP_COUNTER]);
2011 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
2012 if (ret)
2013 goto deref;
2014
2015 spin_lock_irq(&cm_id_priv->lock);
2016 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
2017 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2018 cm_id_priv->private_data,
2019 cm_id_priv->private_data_len);
2020 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
2021 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2022 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
2023 cm_id_priv->private_data,
2024 cm_id_priv->private_data_len);
2025 else
2026 goto unlock;
2027 spin_unlock_irq(&cm_id_priv->lock);
2028
2029 ret = ib_post_send_mad(msg, NULL);
2030 if (ret)
2031 goto free;
2032 goto deref;
2033
2034 unlock: spin_unlock_irq(&cm_id_priv->lock);
2035 free: cm_free_msg(msg);
2036 deref: cm_deref_id(cm_id_priv);
2037 }
2038
2039 static int cm_rep_handler(struct cm_work *work)
2040 {
2041 struct cm_id_private *cm_id_priv;
2042 struct cm_rep_msg *rep_msg;
2043 int ret;
2044 struct cm_id_private *cur_cm_id_priv;
2045 struct ib_cm_id *cm_id;
2046 struct cm_timewait_info *timewait_info;
2047
2048 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2049 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
2050 if (!cm_id_priv) {
2051 cm_dup_rep_handler(work);
2052 return -EINVAL;
2053 }
2054
2055 cm_format_rep_event(work, cm_id_priv->qp_type);
2056
2057 spin_lock_irq(&cm_id_priv->lock);
2058 switch (cm_id_priv->id.state) {
2059 case IB_CM_REQ_SENT:
2060 case IB_CM_MRA_REQ_RCVD:
2061 break;
2062 default:
2063 spin_unlock_irq(&cm_id_priv->lock);
2064 ret = -EINVAL;
2065 goto error;
2066 }
2067
2068 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
2069 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
2070 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2071
2072 spin_lock(&cm.lock);
2073 /* Check for duplicate REP. */
2074 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
2075 spin_unlock(&cm.lock);
2076 spin_unlock_irq(&cm_id_priv->lock);
2077 ret = -EINVAL;
2078 goto error;
2079 }
2080 /* Check for a stale connection. */
2081 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
2082 if (timewait_info) {
2083 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
2084 &cm.remote_id_table);
2085 cm_id_priv->timewait_info->inserted_remote_id = 0;
2086 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
2087 timewait_info->work.remote_id);
2088
2089 spin_unlock(&cm.lock);
2090 spin_unlock_irq(&cm_id_priv->lock);
2091 cm_issue_rej(work->port, work->mad_recv_wc,
2092 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
2093 NULL, 0);
2094 ret = -EINVAL;
2095 if (cur_cm_id_priv) {
2096 cm_id = &cur_cm_id_priv->id;
2097 ib_send_cm_dreq(cm_id, NULL, 0);
2098 cm_deref_id(cur_cm_id_priv);
2099 }
2100
2101 goto error;
2102 }
2103 spin_unlock(&cm.lock);
2104
2105 cm_id_priv->id.state = IB_CM_REP_RCVD;
2106 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
2107 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2108 cm_id_priv->initiator_depth = rep_msg->resp_resources;
2109 cm_id_priv->responder_resources = rep_msg->initiator_depth;
2110 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
2111 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
2112 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
2113 cm_id_priv->av.timeout =
2114 cm_ack_timeout(cm_id_priv->target_ack_delay,
2115 cm_id_priv->av.timeout - 1);
2116 cm_id_priv->alt_av.timeout =
2117 cm_ack_timeout(cm_id_priv->target_ack_delay,
2118 cm_id_priv->alt_av.timeout - 1);
2119
2120 /* todo: handle peer_to_peer */
2121
2122 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2123 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2124 if (!ret)
2125 list_add_tail(&work->list, &cm_id_priv->work_list);
2126 spin_unlock_irq(&cm_id_priv->lock);
2127
2128 if (ret)
2129 cm_process_work(cm_id_priv, work);
2130 else
2131 cm_deref_id(cm_id_priv);
2132 return 0;
2133
2134 error:
2135 cm_deref_id(cm_id_priv);
2136 return ret;
2137 }
2138
2139 static int cm_establish_handler(struct cm_work *work)
2140 {
2141 struct cm_id_private *cm_id_priv;
2142 int ret;
2143
2144 /* See comment in cm_establish about lookup. */
2145 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
2146 if (!cm_id_priv)
2147 return -EINVAL;
2148
2149 spin_lock_irq(&cm_id_priv->lock);
2150 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
2151 spin_unlock_irq(&cm_id_priv->lock);
2152 goto out;
2153 }
2154
2155 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2156 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2157 if (!ret)
2158 list_add_tail(&work->list, &cm_id_priv->work_list);
2159 spin_unlock_irq(&cm_id_priv->lock);
2160
2161 if (ret)
2162 cm_process_work(cm_id_priv, work);
2163 else
2164 cm_deref_id(cm_id_priv);
2165 return 0;
2166 out:
2167 cm_deref_id(cm_id_priv);
2168 return -EINVAL;
2169 }
2170
2171 static int cm_rtu_handler(struct cm_work *work)
2172 {
2173 struct cm_id_private *cm_id_priv;
2174 struct cm_rtu_msg *rtu_msg;
2175 int ret;
2176
2177 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
2178 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
2179 rtu_msg->local_comm_id);
2180 if (!cm_id_priv)
2181 return -EINVAL;
2182
2183 work->cm_event.private_data = &rtu_msg->private_data;
2184
2185 spin_lock_irq(&cm_id_priv->lock);
2186 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
2187 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
2188 spin_unlock_irq(&cm_id_priv->lock);
2189 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2190 counter[CM_RTU_COUNTER]);
2191 goto out;
2192 }
2193 cm_id_priv->id.state = IB_CM_ESTABLISHED;
2194
2195 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2196 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2197 if (!ret)
2198 list_add_tail(&work->list, &cm_id_priv->work_list);
2199 spin_unlock_irq(&cm_id_priv->lock);
2200
2201 if (ret)
2202 cm_process_work(cm_id_priv, work);
2203 else
2204 cm_deref_id(cm_id_priv);
2205 return 0;
2206 out:
2207 cm_deref_id(cm_id_priv);
2208 return -EINVAL;
2209 }
2210
2211 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
2212 struct cm_id_private *cm_id_priv,
2213 const void *private_data,
2214 u8 private_data_len)
2215 {
2216 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
2217 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
2218 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
2219 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
2220 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
2221
2222 if (private_data && private_data_len)
2223 memcpy(dreq_msg->private_data, private_data, private_data_len);
2224 }
2225
2226 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
2227 const void *private_data,
2228 u8 private_data_len)
2229 {
2230 struct cm_id_private *cm_id_priv;
2231 struct ib_mad_send_buf *msg;
2232 unsigned long flags;
2233 int ret;
2234
2235 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
2236 return -EINVAL;
2237
2238 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2239 spin_lock_irqsave(&cm_id_priv->lock, flags);
2240 if (cm_id->state != IB_CM_ESTABLISHED) {
2241 ret = -EINVAL;
2242 goto out;
2243 }
2244
2245 if (cm_id->lap_state == IB_CM_LAP_SENT ||
2246 cm_id->lap_state == IB_CM_MRA_LAP_RCVD)
2247 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2248
2249 ret = cm_alloc_msg(cm_id_priv, &msg);
2250 if (ret) {
2251 cm_enter_timewait(cm_id_priv);
2252 goto out;
2253 }
2254
2255 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2256 private_data, private_data_len);
2257 msg->timeout_ms = cm_id_priv->timeout_ms;
2258 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2259
2260 ret = ib_post_send_mad(msg, NULL);
2261 if (ret) {
2262 cm_enter_timewait(cm_id_priv);
2263 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2264 cm_free_msg(msg);
2265 return ret;
2266 }
2267
2268 cm_id->state = IB_CM_DREQ_SENT;
2269 cm_id_priv->msg = msg;
2270 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2271 return ret;
2272 }
2273 EXPORT_SYMBOL(ib_send_cm_dreq);
2274
2275 static void cm_format_drep(struct cm_drep_msg *drep_msg,
2276 struct cm_id_private *cm_id_priv,
2277 const void *private_data,
2278 u8 private_data_len)
2279 {
2280 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2281 drep_msg->local_comm_id = cm_id_priv->id.local_id;
2282 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
2283
2284 if (private_data && private_data_len)
2285 memcpy(drep_msg->private_data, private_data, private_data_len);
2286 }
2287
2288 int ib_send_cm_drep(struct ib_cm_id *cm_id,
2289 const void *private_data,
2290 u8 private_data_len)
2291 {
2292 struct cm_id_private *cm_id_priv;
2293 struct ib_mad_send_buf *msg;
2294 unsigned long flags;
2295 void *data;
2296 int ret;
2297
2298 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2299 return -EINVAL;
2300
2301 data = cm_copy_private_data(private_data, private_data_len);
2302 if (IS_ERR(data))
2303 return PTR_ERR(data);
2304
2305 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2306 spin_lock_irqsave(&cm_id_priv->lock, flags);
2307 if (cm_id->state != IB_CM_DREQ_RCVD) {
2308 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2309 kfree(data);
2310 return -EINVAL;
2311 }
2312
2313 cm_set_private_data(cm_id_priv, data, private_data_len);
2314 cm_enter_timewait(cm_id_priv);
2315
2316 ret = cm_alloc_msg(cm_id_priv, &msg);
2317 if (ret)
2318 goto out;
2319
2320 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2321 private_data, private_data_len);
2322
2323 ret = ib_post_send_mad(msg, NULL);
2324 if (ret) {
2325 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2326 cm_free_msg(msg);
2327 return ret;
2328 }
2329
2330 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2331 return ret;
2332 }
2333 EXPORT_SYMBOL(ib_send_cm_drep);
2334
2335 static int cm_issue_drep(struct cm_port *port,
2336 struct ib_mad_recv_wc *mad_recv_wc)
2337 {
2338 struct ib_mad_send_buf *msg = NULL;
2339 struct cm_dreq_msg *dreq_msg;
2340 struct cm_drep_msg *drep_msg;
2341 int ret;
2342
2343 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2344 if (ret)
2345 return ret;
2346
2347 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2348 drep_msg = (struct cm_drep_msg *) msg->mad;
2349
2350 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2351 drep_msg->remote_comm_id = dreq_msg->local_comm_id;
2352 drep_msg->local_comm_id = dreq_msg->remote_comm_id;
2353
2354 ret = ib_post_send_mad(msg, NULL);
2355 if (ret)
2356 cm_free_msg(msg);
2357
2358 return ret;
2359 }
2360
2361 static int cm_dreq_handler(struct cm_work *work)
2362 {
2363 struct cm_id_private *cm_id_priv;
2364 struct cm_dreq_msg *dreq_msg;
2365 struct ib_mad_send_buf *msg = NULL;
2366 int ret;
2367
2368 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2369 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
2370 dreq_msg->local_comm_id);
2371 if (!cm_id_priv) {
2372 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2373 counter[CM_DREQ_COUNTER]);
2374 cm_issue_drep(work->port, work->mad_recv_wc);
2375 return -EINVAL;
2376 }
2377
2378 work->cm_event.private_data = &dreq_msg->private_data;
2379
2380 spin_lock_irq(&cm_id_priv->lock);
2381 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
2382 goto unlock;
2383
2384 switch (cm_id_priv->id.state) {
2385 case IB_CM_REP_SENT:
2386 case IB_CM_DREQ_SENT:
2387 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2388 break;
2389 case IB_CM_ESTABLISHED:
2390 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2391 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2392 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2393 break;
2394 case IB_CM_MRA_REP_RCVD:
2395 break;
2396 case IB_CM_TIMEWAIT:
2397 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2398 counter[CM_DREQ_COUNTER]);
2399 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2400 goto unlock;
2401
2402 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2403 cm_id_priv->private_data,
2404 cm_id_priv->private_data_len);
2405 spin_unlock_irq(&cm_id_priv->lock);
2406
2407 if (ib_post_send_mad(msg, NULL))
2408 cm_free_msg(msg);
2409 goto deref;
2410 case IB_CM_DREQ_RCVD:
2411 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2412 counter[CM_DREQ_COUNTER]);
2413 goto unlock;
2414 default:
2415 goto unlock;
2416 }
2417 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2418 cm_id_priv->tid = dreq_msg->hdr.tid;
2419 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2420 if (!ret)
2421 list_add_tail(&work->list, &cm_id_priv->work_list);
2422 spin_unlock_irq(&cm_id_priv->lock);
2423
2424 if (ret)
2425 cm_process_work(cm_id_priv, work);
2426 else
2427 cm_deref_id(cm_id_priv);
2428 return 0;
2429
2430 unlock: spin_unlock_irq(&cm_id_priv->lock);
2431 deref: cm_deref_id(cm_id_priv);
2432 return -EINVAL;
2433 }
2434
2435 static int cm_drep_handler(struct cm_work *work)
2436 {
2437 struct cm_id_private *cm_id_priv;
2438 struct cm_drep_msg *drep_msg;
2439 int ret;
2440
2441 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2442 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2443 drep_msg->local_comm_id);
2444 if (!cm_id_priv)
2445 return -EINVAL;
2446
2447 work->cm_event.private_data = &drep_msg->private_data;
2448
2449 spin_lock_irq(&cm_id_priv->lock);
2450 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2451 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2452 spin_unlock_irq(&cm_id_priv->lock);
2453 goto out;
2454 }
2455 cm_enter_timewait(cm_id_priv);
2456
2457 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2458 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2459 if (!ret)
2460 list_add_tail(&work->list, &cm_id_priv->work_list);
2461 spin_unlock_irq(&cm_id_priv->lock);
2462
2463 if (ret)
2464 cm_process_work(cm_id_priv, work);
2465 else
2466 cm_deref_id(cm_id_priv);
2467 return 0;
2468 out:
2469 cm_deref_id(cm_id_priv);
2470 return -EINVAL;
2471 }
2472
2473 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2474 enum ib_cm_rej_reason reason,
2475 void *ari,
2476 u8 ari_length,
2477 const void *private_data,
2478 u8 private_data_len)
2479 {
2480 struct cm_id_private *cm_id_priv;
2481 struct ib_mad_send_buf *msg;
2482 unsigned long flags;
2483 int ret;
2484
2485 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2486 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2487 return -EINVAL;
2488
2489 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2490
2491 spin_lock_irqsave(&cm_id_priv->lock, flags);
2492 switch (cm_id->state) {
2493 case IB_CM_REQ_SENT:
2494 case IB_CM_MRA_REQ_RCVD:
2495 case IB_CM_REQ_RCVD:
2496 case IB_CM_MRA_REQ_SENT:
2497 case IB_CM_REP_RCVD:
2498 case IB_CM_MRA_REP_SENT:
2499 ret = cm_alloc_msg(cm_id_priv, &msg);
2500 if (!ret)
2501 cm_format_rej((struct cm_rej_msg *) msg->mad,
2502 cm_id_priv, reason, ari, ari_length,
2503 private_data, private_data_len);
2504
2505 cm_reset_to_idle(cm_id_priv);
2506 break;
2507 case IB_CM_REP_SENT:
2508 case IB_CM_MRA_REP_RCVD:
2509 ret = cm_alloc_msg(cm_id_priv, &msg);
2510 if (!ret)
2511 cm_format_rej((struct cm_rej_msg *) msg->mad,
2512 cm_id_priv, reason, ari, ari_length,
2513 private_data, private_data_len);
2514
2515 cm_enter_timewait(cm_id_priv);
2516 break;
2517 default:
2518 ret = -EINVAL;
2519 goto out;
2520 }
2521
2522 if (ret)
2523 goto out;
2524
2525 ret = ib_post_send_mad(msg, NULL);
2526 if (ret)
2527 cm_free_msg(msg);
2528
2529 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2530 return ret;
2531 }
2532 EXPORT_SYMBOL(ib_send_cm_rej);
2533
2534 static void cm_format_rej_event(struct cm_work *work)
2535 {
2536 struct cm_rej_msg *rej_msg;
2537 struct ib_cm_rej_event_param *param;
2538
2539 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2540 param = &work->cm_event.param.rej_rcvd;
2541 param->ari = rej_msg->ari;
2542 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2543 param->reason = __be16_to_cpu(rej_msg->reason);
2544 work->cm_event.private_data = &rej_msg->private_data;
2545 }
2546
2547 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2548 {
2549 struct cm_timewait_info *timewait_info;
2550 struct cm_id_private *cm_id_priv;
2551 __be32 remote_id;
2552
2553 remote_id = rej_msg->local_comm_id;
2554
2555 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2556 spin_lock_irq(&cm.lock);
2557 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2558 remote_id);
2559 if (!timewait_info) {
2560 spin_unlock_irq(&cm.lock);
2561 return NULL;
2562 }
2563 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2564 (timewait_info->work.local_id ^
2565 cm.random_id_operand));
2566 if (cm_id_priv) {
2567 if (cm_id_priv->id.remote_id == remote_id)
2568 atomic_inc(&cm_id_priv->refcount);
2569 else
2570 cm_id_priv = NULL;
2571 }
2572 spin_unlock_irq(&cm.lock);
2573 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2574 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2575 else
2576 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2577
2578 return cm_id_priv;
2579 }
2580
2581 static int cm_rej_handler(struct cm_work *work)
2582 {
2583 struct cm_id_private *cm_id_priv;
2584 struct cm_rej_msg *rej_msg;
2585 int ret;
2586
2587 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2588 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2589 if (!cm_id_priv)
2590 return -EINVAL;
2591
2592 cm_format_rej_event(work);
2593
2594 spin_lock_irq(&cm_id_priv->lock);
2595 switch (cm_id_priv->id.state) {
2596 case IB_CM_REQ_SENT:
2597 case IB_CM_MRA_REQ_RCVD:
2598 case IB_CM_REP_SENT:
2599 case IB_CM_MRA_REP_RCVD:
2600 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2601 /* fall through */
2602 case IB_CM_REQ_RCVD:
2603 case IB_CM_MRA_REQ_SENT:
2604 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2605 cm_enter_timewait(cm_id_priv);
2606 else
2607 cm_reset_to_idle(cm_id_priv);
2608 break;
2609 case IB_CM_DREQ_SENT:
2610 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2611 /* fall through */
2612 case IB_CM_REP_RCVD:
2613 case IB_CM_MRA_REP_SENT:
2614 cm_enter_timewait(cm_id_priv);
2615 break;
2616 case IB_CM_ESTABLISHED:
2617 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
2618 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
2619 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
2620 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2621 cm_id_priv->msg);
2622 cm_enter_timewait(cm_id_priv);
2623 break;
2624 }
2625 /* fall through */
2626 default:
2627 spin_unlock_irq(&cm_id_priv->lock);
2628 ret = -EINVAL;
2629 goto out;
2630 }
2631
2632 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2633 if (!ret)
2634 list_add_tail(&work->list, &cm_id_priv->work_list);
2635 spin_unlock_irq(&cm_id_priv->lock);
2636
2637 if (ret)
2638 cm_process_work(cm_id_priv, work);
2639 else
2640 cm_deref_id(cm_id_priv);
2641 return 0;
2642 out:
2643 cm_deref_id(cm_id_priv);
2644 return -EINVAL;
2645 }
2646
2647 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2648 u8 service_timeout,
2649 const void *private_data,
2650 u8 private_data_len)
2651 {
2652 struct cm_id_private *cm_id_priv;
2653 struct ib_mad_send_buf *msg;
2654 enum ib_cm_state cm_state;
2655 enum ib_cm_lap_state lap_state;
2656 enum cm_msg_response msg_response;
2657 void *data;
2658 unsigned long flags;
2659 int ret;
2660
2661 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2662 return -EINVAL;
2663
2664 data = cm_copy_private_data(private_data, private_data_len);
2665 if (IS_ERR(data))
2666 return PTR_ERR(data);
2667
2668 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2669
2670 spin_lock_irqsave(&cm_id_priv->lock, flags);
2671 switch(cm_id_priv->id.state) {
2672 case IB_CM_REQ_RCVD:
2673 cm_state = IB_CM_MRA_REQ_SENT;
2674 lap_state = cm_id->lap_state;
2675 msg_response = CM_MSG_RESPONSE_REQ;
2676 break;
2677 case IB_CM_REP_RCVD:
2678 cm_state = IB_CM_MRA_REP_SENT;
2679 lap_state = cm_id->lap_state;
2680 msg_response = CM_MSG_RESPONSE_REP;
2681 break;
2682 case IB_CM_ESTABLISHED:
2683 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
2684 cm_state = cm_id->state;
2685 lap_state = IB_CM_MRA_LAP_SENT;
2686 msg_response = CM_MSG_RESPONSE_OTHER;
2687 break;
2688 }
2689 default:
2690 ret = -EINVAL;
2691 goto error1;
2692 }
2693
2694 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
2695 ret = cm_alloc_msg(cm_id_priv, &msg);
2696 if (ret)
2697 goto error1;
2698
2699 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2700 msg_response, service_timeout,
2701 private_data, private_data_len);
2702 ret = ib_post_send_mad(msg, NULL);
2703 if (ret)
2704 goto error2;
2705 }
2706
2707 cm_id->state = cm_state;
2708 cm_id->lap_state = lap_state;
2709 cm_id_priv->service_timeout = service_timeout;
2710 cm_set_private_data(cm_id_priv, data, private_data_len);
2711 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2712 return 0;
2713
2714 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2715 kfree(data);
2716 return ret;
2717
2718 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2719 kfree(data);
2720 cm_free_msg(msg);
2721 return ret;
2722 }
2723 EXPORT_SYMBOL(ib_send_cm_mra);
2724
2725 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2726 {
2727 switch (cm_mra_get_msg_mraed(mra_msg)) {
2728 case CM_MSG_RESPONSE_REQ:
2729 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2730 case CM_MSG_RESPONSE_REP:
2731 case CM_MSG_RESPONSE_OTHER:
2732 return cm_acquire_id(mra_msg->remote_comm_id,
2733 mra_msg->local_comm_id);
2734 default:
2735 return NULL;
2736 }
2737 }
2738
2739 static int cm_mra_handler(struct cm_work *work)
2740 {
2741 struct cm_id_private *cm_id_priv;
2742 struct cm_mra_msg *mra_msg;
2743 int timeout, ret;
2744
2745 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2746 cm_id_priv = cm_acquire_mraed_id(mra_msg);
2747 if (!cm_id_priv)
2748 return -EINVAL;
2749
2750 work->cm_event.private_data = &mra_msg->private_data;
2751 work->cm_event.param.mra_rcvd.service_timeout =
2752 cm_mra_get_service_timeout(mra_msg);
2753 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2754 cm_convert_to_ms(cm_id_priv->av.timeout);
2755
2756 spin_lock_irq(&cm_id_priv->lock);
2757 switch (cm_id_priv->id.state) {
2758 case IB_CM_REQ_SENT:
2759 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2760 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2761 cm_id_priv->msg, timeout))
2762 goto out;
2763 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2764 break;
2765 case IB_CM_REP_SENT:
2766 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2767 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2768 cm_id_priv->msg, timeout))
2769 goto out;
2770 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2771 break;
2772 case IB_CM_ESTABLISHED:
2773 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2774 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2775 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2776 cm_id_priv->msg, timeout)) {
2777 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2778 atomic_long_inc(&work->port->
2779 counter_group[CM_RECV_DUPLICATES].
2780 counter[CM_MRA_COUNTER]);
2781 goto out;
2782 }
2783 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2784 break;
2785 case IB_CM_MRA_REQ_RCVD:
2786 case IB_CM_MRA_REP_RCVD:
2787 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2788 counter[CM_MRA_COUNTER]);
2789 /* fall through */
2790 default:
2791 goto out;
2792 }
2793
2794 cm_id_priv->msg->context[1] = (void *) (unsigned long)
2795 cm_id_priv->id.state;
2796 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2797 if (!ret)
2798 list_add_tail(&work->list, &cm_id_priv->work_list);
2799 spin_unlock_irq(&cm_id_priv->lock);
2800
2801 if (ret)
2802 cm_process_work(cm_id_priv, work);
2803 else
2804 cm_deref_id(cm_id_priv);
2805 return 0;
2806 out:
2807 spin_unlock_irq(&cm_id_priv->lock);
2808 cm_deref_id(cm_id_priv);
2809 return -EINVAL;
2810 }
2811
2812 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2813 struct cm_id_private *cm_id_priv,
2814 struct ib_sa_path_rec *alternate_path,
2815 const void *private_data,
2816 u8 private_data_len)
2817 {
2818 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2819 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2820 lap_msg->local_comm_id = cm_id_priv->id.local_id;
2821 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2822 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2823 /* todo: need remote CM response timeout */
2824 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2825 lap_msg->alt_local_lid = alternate_path->slid;
2826 lap_msg->alt_remote_lid = alternate_path->dlid;
2827 lap_msg->alt_local_gid = alternate_path->sgid;
2828 lap_msg->alt_remote_gid = alternate_path->dgid;
2829 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2830 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2831 lap_msg->alt_hop_limit = alternate_path->hop_limit;
2832 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2833 cm_lap_set_sl(lap_msg, alternate_path->sl);
2834 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2835 cm_lap_set_local_ack_timeout(lap_msg,
2836 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
2837 alternate_path->packet_life_time));
2838
2839 if (private_data && private_data_len)
2840 memcpy(lap_msg->private_data, private_data, private_data_len);
2841 }
2842
2843 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2844 struct ib_sa_path_rec *alternate_path,
2845 const void *private_data,
2846 u8 private_data_len)
2847 {
2848 struct cm_id_private *cm_id_priv;
2849 struct ib_mad_send_buf *msg;
2850 unsigned long flags;
2851 int ret;
2852
2853 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2854 return -EINVAL;
2855
2856 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2857 spin_lock_irqsave(&cm_id_priv->lock, flags);
2858 if (cm_id->state != IB_CM_ESTABLISHED ||
2859 (cm_id->lap_state != IB_CM_LAP_UNINIT &&
2860 cm_id->lap_state != IB_CM_LAP_IDLE)) {
2861 ret = -EINVAL;
2862 goto out;
2863 }
2864
2865 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av,
2866 cm_id_priv);
2867 if (ret)
2868 goto out;
2869 cm_id_priv->alt_av.timeout =
2870 cm_ack_timeout(cm_id_priv->target_ack_delay,
2871 cm_id_priv->alt_av.timeout - 1);
2872
2873 ret = cm_alloc_msg(cm_id_priv, &msg);
2874 if (ret)
2875 goto out;
2876
2877 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2878 alternate_path, private_data, private_data_len);
2879 msg->timeout_ms = cm_id_priv->timeout_ms;
2880 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2881
2882 ret = ib_post_send_mad(msg, NULL);
2883 if (ret) {
2884 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2885 cm_free_msg(msg);
2886 return ret;
2887 }
2888
2889 cm_id->lap_state = IB_CM_LAP_SENT;
2890 cm_id_priv->msg = msg;
2891
2892 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2893 return ret;
2894 }
2895 EXPORT_SYMBOL(ib_send_cm_lap);
2896
2897 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
2898 struct ib_sa_path_rec *path,
2899 struct cm_lap_msg *lap_msg)
2900 {
2901 memset(path, 0, sizeof *path);
2902 path->dgid = lap_msg->alt_local_gid;
2903 path->sgid = lap_msg->alt_remote_gid;
2904 path->dlid = lap_msg->alt_local_lid;
2905 path->slid = lap_msg->alt_remote_lid;
2906 path->flow_label = cm_lap_get_flow_label(lap_msg);
2907 path->hop_limit = lap_msg->alt_hop_limit;
2908 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2909 path->reversible = 1;
2910 path->pkey = cm_id_priv->pkey;
2911 path->sl = cm_lap_get_sl(lap_msg);
2912 path->mtu_selector = IB_SA_EQ;
2913 path->mtu = cm_id_priv->path_mtu;
2914 path->rate_selector = IB_SA_EQ;
2915 path->rate = cm_lap_get_packet_rate(lap_msg);
2916 path->packet_life_time_selector = IB_SA_EQ;
2917 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2918 path->packet_life_time -= (path->packet_life_time > 0);
2919 }
2920
2921 static int cm_lap_handler(struct cm_work *work)
2922 {
2923 struct cm_id_private *cm_id_priv;
2924 struct cm_lap_msg *lap_msg;
2925 struct ib_cm_lap_event_param *param;
2926 struct ib_mad_send_buf *msg = NULL;
2927 int ret;
2928
2929 /* todo: verify LAP request and send reject APR if invalid. */
2930 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2931 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2932 lap_msg->local_comm_id);
2933 if (!cm_id_priv)
2934 return -EINVAL;
2935
2936 param = &work->cm_event.param.lap_rcvd;
2937 param->alternate_path = &work->path[0];
2938 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
2939 work->cm_event.private_data = &lap_msg->private_data;
2940
2941 spin_lock_irq(&cm_id_priv->lock);
2942 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2943 goto unlock;
2944
2945 switch (cm_id_priv->id.lap_state) {
2946 case IB_CM_LAP_UNINIT:
2947 case IB_CM_LAP_IDLE:
2948 break;
2949 case IB_CM_MRA_LAP_SENT:
2950 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2951 counter[CM_LAP_COUNTER]);
2952 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2953 goto unlock;
2954
2955 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2956 CM_MSG_RESPONSE_OTHER,
2957 cm_id_priv->service_timeout,
2958 cm_id_priv->private_data,
2959 cm_id_priv->private_data_len);
2960 spin_unlock_irq(&cm_id_priv->lock);
2961
2962 if (ib_post_send_mad(msg, NULL))
2963 cm_free_msg(msg);
2964 goto deref;
2965 case IB_CM_LAP_RCVD:
2966 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2967 counter[CM_LAP_COUNTER]);
2968 goto unlock;
2969 default:
2970 goto unlock;
2971 }
2972
2973 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2974 cm_id_priv->tid = lap_msg->hdr.tid;
2975 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2976 work->mad_recv_wc->recv_buf.grh,
2977 &cm_id_priv->av);
2978 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av,
2979 cm_id_priv);
2980 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2981 if (!ret)
2982 list_add_tail(&work->list, &cm_id_priv->work_list);
2983 spin_unlock_irq(&cm_id_priv->lock);
2984
2985 if (ret)
2986 cm_process_work(cm_id_priv, work);
2987 else
2988 cm_deref_id(cm_id_priv);
2989 return 0;
2990
2991 unlock: spin_unlock_irq(&cm_id_priv->lock);
2992 deref: cm_deref_id(cm_id_priv);
2993 return -EINVAL;
2994 }
2995
2996 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2997 struct cm_id_private *cm_id_priv,
2998 enum ib_cm_apr_status status,
2999 void *info,
3000 u8 info_length,
3001 const void *private_data,
3002 u8 private_data_len)
3003 {
3004 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
3005 apr_msg->local_comm_id = cm_id_priv->id.local_id;
3006 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
3007 apr_msg->ap_status = (u8) status;
3008
3009 if (info && info_length) {
3010 apr_msg->info_length = info_length;
3011 memcpy(apr_msg->info, info, info_length);
3012 }
3013
3014 if (private_data && private_data_len)
3015 memcpy(apr_msg->private_data, private_data, private_data_len);
3016 }
3017
3018 int ib_send_cm_apr(struct ib_cm_id *cm_id,
3019 enum ib_cm_apr_status status,
3020 void *info,
3021 u8 info_length,
3022 const void *private_data,
3023 u8 private_data_len)
3024 {
3025 struct cm_id_private *cm_id_priv;
3026 struct ib_mad_send_buf *msg;
3027 unsigned long flags;
3028 int ret;
3029
3030 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
3031 (info && info_length > IB_CM_APR_INFO_LENGTH))
3032 return -EINVAL;
3033
3034 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3035 spin_lock_irqsave(&cm_id_priv->lock, flags);
3036 if (cm_id->state != IB_CM_ESTABLISHED ||
3037 (cm_id->lap_state != IB_CM_LAP_RCVD &&
3038 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
3039 ret = -EINVAL;
3040 goto out;
3041 }
3042
3043 ret = cm_alloc_msg(cm_id_priv, &msg);
3044 if (ret)
3045 goto out;
3046
3047 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
3048 info, info_length, private_data, private_data_len);
3049 ret = ib_post_send_mad(msg, NULL);
3050 if (ret) {
3051 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3052 cm_free_msg(msg);
3053 return ret;
3054 }
3055
3056 cm_id->lap_state = IB_CM_LAP_IDLE;
3057 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3058 return ret;
3059 }
3060 EXPORT_SYMBOL(ib_send_cm_apr);
3061
3062 static int cm_apr_handler(struct cm_work *work)
3063 {
3064 struct cm_id_private *cm_id_priv;
3065 struct cm_apr_msg *apr_msg;
3066 int ret;
3067
3068 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
3069 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
3070 apr_msg->local_comm_id);
3071 if (!cm_id_priv)
3072 return -EINVAL; /* Unmatched reply. */
3073
3074 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
3075 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
3076 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
3077 work->cm_event.private_data = &apr_msg->private_data;
3078
3079 spin_lock_irq(&cm_id_priv->lock);
3080 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
3081 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
3082 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
3083 spin_unlock_irq(&cm_id_priv->lock);
3084 goto out;
3085 }
3086 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
3087 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3088 cm_id_priv->msg = NULL;
3089
3090 ret = atomic_inc_and_test(&cm_id_priv->work_count);
3091 if (!ret)
3092 list_add_tail(&work->list, &cm_id_priv->work_list);
3093 spin_unlock_irq(&cm_id_priv->lock);
3094
3095 if (ret)
3096 cm_process_work(cm_id_priv, work);
3097 else
3098 cm_deref_id(cm_id_priv);
3099 return 0;
3100 out:
3101 cm_deref_id(cm_id_priv);
3102 return -EINVAL;
3103 }
3104
3105 static int cm_timewait_handler(struct cm_work *work)
3106 {
3107 struct cm_timewait_info *timewait_info;
3108 struct cm_id_private *cm_id_priv;
3109 int ret;
3110
3111 timewait_info = (struct cm_timewait_info *)work;
3112 spin_lock_irq(&cm.lock);
3113 list_del(&timewait_info->list);
3114 spin_unlock_irq(&cm.lock);
3115
3116 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
3117 timewait_info->work.remote_id);
3118 if (!cm_id_priv)
3119 return -EINVAL;
3120
3121 spin_lock_irq(&cm_id_priv->lock);
3122 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
3123 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
3124 spin_unlock_irq(&cm_id_priv->lock);
3125 goto out;
3126 }
3127 cm_id_priv->id.state = IB_CM_IDLE;
3128 ret = atomic_inc_and_test(&cm_id_priv->work_count);
3129 if (!ret)
3130 list_add_tail(&work->list, &cm_id_priv->work_list);
3131 spin_unlock_irq(&cm_id_priv->lock);
3132
3133 if (ret)
3134 cm_process_work(cm_id_priv, work);
3135 else
3136 cm_deref_id(cm_id_priv);
3137 return 0;
3138 out:
3139 cm_deref_id(cm_id_priv);
3140 return -EINVAL;
3141 }
3142
3143 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
3144 struct cm_id_private *cm_id_priv,
3145 struct ib_cm_sidr_req_param *param)
3146 {
3147 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
3148 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
3149 sidr_req_msg->request_id = cm_id_priv->id.local_id;
3150 sidr_req_msg->pkey = param->path->pkey;
3151 sidr_req_msg->service_id = param->service_id;
3152
3153 if (param->private_data && param->private_data_len)
3154 memcpy(sidr_req_msg->private_data, param->private_data,
3155 param->private_data_len);
3156 }
3157
3158 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
3159 struct ib_cm_sidr_req_param *param)
3160 {
3161 struct cm_id_private *cm_id_priv;
3162 struct ib_mad_send_buf *msg;
3163 unsigned long flags;
3164 int ret;
3165
3166 if (!param->path || (param->private_data &&
3167 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
3168 return -EINVAL;
3169
3170 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3171 ret = cm_init_av_by_path(param->path, &cm_id_priv->av, cm_id_priv);
3172 if (ret)
3173 goto out;
3174
3175 cm_id->service_id = param->service_id;
3176 cm_id->service_mask = ~cpu_to_be64(0);
3177 cm_id_priv->timeout_ms = param->timeout_ms;
3178 cm_id_priv->max_cm_retries = param->max_cm_retries;
3179 ret = cm_alloc_msg(cm_id_priv, &msg);
3180 if (ret)
3181 goto out;
3182
3183 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
3184 param);
3185 msg->timeout_ms = cm_id_priv->timeout_ms;
3186 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
3187
3188 spin_lock_irqsave(&cm_id_priv->lock, flags);
3189 if (cm_id->state == IB_CM_IDLE)
3190 ret = ib_post_send_mad(msg, NULL);
3191 else
3192 ret = -EINVAL;
3193
3194 if (ret) {
3195 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3196 cm_free_msg(msg);
3197 goto out;
3198 }
3199 cm_id->state = IB_CM_SIDR_REQ_SENT;
3200 cm_id_priv->msg = msg;
3201 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3202 out:
3203 return ret;
3204 }
3205 EXPORT_SYMBOL(ib_send_cm_sidr_req);
3206
3207 static void cm_format_sidr_req_event(struct cm_work *work,
3208 struct ib_cm_id *listen_id)
3209 {
3210 struct cm_sidr_req_msg *sidr_req_msg;
3211 struct ib_cm_sidr_req_event_param *param;
3212
3213 sidr_req_msg = (struct cm_sidr_req_msg *)
3214 work->mad_recv_wc->recv_buf.mad;
3215 param = &work->cm_event.param.sidr_req_rcvd;
3216 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
3217 param->listen_id = listen_id;
3218 param->service_id = sidr_req_msg->service_id;
3219 param->bth_pkey = cm_get_bth_pkey(work);
3220 param->port = work->port->port_num;
3221 work->cm_event.private_data = &sidr_req_msg->private_data;
3222 }
3223
3224 static int cm_sidr_req_handler(struct cm_work *work)
3225 {
3226 struct ib_cm_id *cm_id;
3227 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
3228 struct cm_sidr_req_msg *sidr_req_msg;
3229 struct ib_wc *wc;
3230
3231 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
3232 if (IS_ERR(cm_id))
3233 return PTR_ERR(cm_id);
3234 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3235
3236 /* Record SGID/SLID and request ID for lookup. */
3237 sidr_req_msg = (struct cm_sidr_req_msg *)
3238 work->mad_recv_wc->recv_buf.mad;
3239 wc = work->mad_recv_wc->wc;
3240 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
3241 cm_id_priv->av.dgid.global.interface_id = 0;
3242 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
3243 work->mad_recv_wc->recv_buf.grh,
3244 &cm_id_priv->av);
3245 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
3246 cm_id_priv->tid = sidr_req_msg->hdr.tid;
3247 atomic_inc(&cm_id_priv->work_count);
3248
3249 spin_lock_irq(&cm.lock);
3250 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3251 if (cur_cm_id_priv) {
3252 spin_unlock_irq(&cm.lock);
3253 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3254 counter[CM_SIDR_REQ_COUNTER]);
3255 goto out; /* Duplicate message. */
3256 }
3257 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3258 cur_cm_id_priv = cm_find_listen(cm_id->device,
3259 sidr_req_msg->service_id);
3260 if (!cur_cm_id_priv) {
3261 spin_unlock_irq(&cm.lock);
3262 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED);
3263 goto out; /* No match. */
3264 }
3265 atomic_inc(&cur_cm_id_priv->refcount);
3266 atomic_inc(&cm_id_priv->refcount);
3267 spin_unlock_irq(&cm.lock);
3268
3269 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
3270 cm_id_priv->id.context = cur_cm_id_priv->id.context;
3271 cm_id_priv->id.service_id = sidr_req_msg->service_id;
3272 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3273
3274 cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
3275 cm_process_work(cm_id_priv, work);
3276 cm_deref_id(cur_cm_id_priv);
3277 return 0;
3278 out:
3279 ib_destroy_cm_id(&cm_id_priv->id);
3280 return -EINVAL;
3281 }
3282
3283 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3284 struct cm_id_private *cm_id_priv,
3285 struct ib_cm_sidr_rep_param *param)
3286 {
3287 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3288 cm_id_priv->tid);
3289 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
3290 sidr_rep_msg->status = param->status;
3291 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
3292 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
3293 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
3294
3295 if (param->info && param->info_length)
3296 memcpy(sidr_rep_msg->info, param->info, param->info_length);
3297
3298 if (param->private_data && param->private_data_len)
3299 memcpy(sidr_rep_msg->private_data, param->private_data,
3300 param->private_data_len);
3301 }
3302
3303 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3304 struct ib_cm_sidr_rep_param *param)
3305 {
3306 struct cm_id_private *cm_id_priv;
3307 struct ib_mad_send_buf *msg;
3308 unsigned long flags;
3309 int ret;
3310
3311 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3312 (param->private_data &&
3313 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3314 return -EINVAL;
3315
3316 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3317 spin_lock_irqsave(&cm_id_priv->lock, flags);
3318 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
3319 ret = -EINVAL;
3320 goto error;
3321 }
3322
3323 ret = cm_alloc_msg(cm_id_priv, &msg);
3324 if (ret)
3325 goto error;
3326
3327 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3328 param);
3329 ret = ib_post_send_mad(msg, NULL);
3330 if (ret) {
3331 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3332 cm_free_msg(msg);
3333 return ret;
3334 }
3335 cm_id->state = IB_CM_IDLE;
3336 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3337
3338 spin_lock_irqsave(&cm.lock, flags);
3339 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) {
3340 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3341 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
3342 }
3343 spin_unlock_irqrestore(&cm.lock, flags);
3344 return 0;
3345
3346 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3347 return ret;
3348 }
3349 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3350
3351 static void cm_format_sidr_rep_event(struct cm_work *work)
3352 {
3353 struct cm_sidr_rep_msg *sidr_rep_msg;
3354 struct ib_cm_sidr_rep_event_param *param;
3355
3356 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3357 work->mad_recv_wc->recv_buf.mad;
3358 param = &work->cm_event.param.sidr_rep_rcvd;
3359 param->status = sidr_rep_msg->status;
3360 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
3361 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
3362 param->info = &sidr_rep_msg->info;
3363 param->info_len = sidr_rep_msg->info_length;
3364 work->cm_event.private_data = &sidr_rep_msg->private_data;
3365 }
3366
3367 static int cm_sidr_rep_handler(struct cm_work *work)
3368 {
3369 struct cm_sidr_rep_msg *sidr_rep_msg;
3370 struct cm_id_private *cm_id_priv;
3371
3372 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3373 work->mad_recv_wc->recv_buf.mad;
3374 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
3375 if (!cm_id_priv)
3376 return -EINVAL; /* Unmatched reply. */
3377
3378 spin_lock_irq(&cm_id_priv->lock);
3379 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3380 spin_unlock_irq(&cm_id_priv->lock);
3381 goto out;
3382 }
3383 cm_id_priv->id.state = IB_CM_IDLE;
3384 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3385 spin_unlock_irq(&cm_id_priv->lock);
3386
3387 cm_format_sidr_rep_event(work);
3388 cm_process_work(cm_id_priv, work);
3389 return 0;
3390 out:
3391 cm_deref_id(cm_id_priv);
3392 return -EINVAL;
3393 }
3394
3395 static void cm_process_send_error(struct ib_mad_send_buf *msg,
3396 enum ib_wc_status wc_status)
3397 {
3398 struct cm_id_private *cm_id_priv;
3399 struct ib_cm_event cm_event;
3400 enum ib_cm_state state;
3401 int ret;
3402
3403 memset(&cm_event, 0, sizeof cm_event);
3404 cm_id_priv = msg->context[0];
3405
3406 /* Discard old sends or ones without a response. */
3407 spin_lock_irq(&cm_id_priv->lock);
3408 state = (enum ib_cm_state) (unsigned long) msg->context[1];
3409 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3410 goto discard;
3411
3412 switch (state) {
3413 case IB_CM_REQ_SENT:
3414 case IB_CM_MRA_REQ_RCVD:
3415 cm_reset_to_idle(cm_id_priv);
3416 cm_event.event = IB_CM_REQ_ERROR;
3417 break;
3418 case IB_CM_REP_SENT:
3419 case IB_CM_MRA_REP_RCVD:
3420 cm_reset_to_idle(cm_id_priv);
3421 cm_event.event = IB_CM_REP_ERROR;
3422 break;
3423 case IB_CM_DREQ_SENT:
3424 cm_enter_timewait(cm_id_priv);
3425 cm_event.event = IB_CM_DREQ_ERROR;
3426 break;
3427 case IB_CM_SIDR_REQ_SENT:
3428 cm_id_priv->id.state = IB_CM_IDLE;
3429 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3430 break;
3431 default:
3432 goto discard;
3433 }
3434 spin_unlock_irq(&cm_id_priv->lock);
3435 cm_event.param.send_status = wc_status;
3436
3437 /* No other events can occur on the cm_id at this point. */
3438 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3439 cm_free_msg(msg);
3440 if (ret)
3441 ib_destroy_cm_id(&cm_id_priv->id);
3442 return;
3443 discard:
3444 spin_unlock_irq(&cm_id_priv->lock);
3445 cm_free_msg(msg);
3446 }
3447
3448 static void cm_send_handler(struct ib_mad_agent *mad_agent,
3449 struct ib_mad_send_wc *mad_send_wc)
3450 {
3451 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3452 struct cm_port *port;
3453 u16 attr_index;
3454
3455 port = mad_agent->context;
3456 attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3457 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3458
3459 /*
3460 * If the send was in response to a received message (context[0] is not
3461 * set to a cm_id), and is not a REJ, then it is a send that was
3462 * manually retried.
3463 */
3464 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3465 msg->retries = 1;
3466
3467 atomic_long_add(1 + msg->retries,
3468 &port->counter_group[CM_XMIT].counter[attr_index]);
3469 if (msg->retries)
3470 atomic_long_add(msg->retries,
3471 &port->counter_group[CM_XMIT_RETRIES].
3472 counter[attr_index]);
3473
3474 switch (mad_send_wc->status) {
3475 case IB_WC_SUCCESS:
3476 case IB_WC_WR_FLUSH_ERR:
3477 cm_free_msg(msg);
3478 break;
3479 default:
3480 if (msg->context[0] && msg->context[1])
3481 cm_process_send_error(msg, mad_send_wc->status);
3482 else
3483 cm_free_msg(msg);
3484 break;
3485 }
3486 }
3487
3488 static void cm_work_handler(struct work_struct *_work)
3489 {
3490 struct cm_work *work = container_of(_work, struct cm_work, work.work);
3491 int ret;
3492
3493 switch (work->cm_event.event) {
3494 case IB_CM_REQ_RECEIVED:
3495 ret = cm_req_handler(work);
3496 break;
3497 case IB_CM_MRA_RECEIVED:
3498 ret = cm_mra_handler(work);
3499 break;
3500 case IB_CM_REJ_RECEIVED:
3501 ret = cm_rej_handler(work);
3502 break;
3503 case IB_CM_REP_RECEIVED:
3504 ret = cm_rep_handler(work);
3505 break;
3506 case IB_CM_RTU_RECEIVED:
3507 ret = cm_rtu_handler(work);
3508 break;
3509 case IB_CM_USER_ESTABLISHED:
3510 ret = cm_establish_handler(work);
3511 break;
3512 case IB_CM_DREQ_RECEIVED:
3513 ret = cm_dreq_handler(work);
3514 break;
3515 case IB_CM_DREP_RECEIVED:
3516 ret = cm_drep_handler(work);
3517 break;
3518 case IB_CM_SIDR_REQ_RECEIVED:
3519 ret = cm_sidr_req_handler(work);
3520 break;
3521 case IB_CM_SIDR_REP_RECEIVED:
3522 ret = cm_sidr_rep_handler(work);
3523 break;
3524 case IB_CM_LAP_RECEIVED:
3525 ret = cm_lap_handler(work);
3526 break;
3527 case IB_CM_APR_RECEIVED:
3528 ret = cm_apr_handler(work);
3529 break;
3530 case IB_CM_TIMEWAIT_EXIT:
3531 ret = cm_timewait_handler(work);
3532 break;
3533 default:
3534 ret = -EINVAL;
3535 break;
3536 }
3537 if (ret)
3538 cm_free_work(work);
3539 }
3540
3541 static int cm_establish(struct ib_cm_id *cm_id)
3542 {
3543 struct cm_id_private *cm_id_priv;
3544 struct cm_work *work;
3545 unsigned long flags;
3546 int ret = 0;
3547 struct cm_device *cm_dev;
3548
3549 cm_dev = ib_get_client_data(cm_id->device, &cm_client);
3550 if (!cm_dev)
3551 return -ENODEV;
3552
3553 work = kmalloc(sizeof *work, GFP_ATOMIC);
3554 if (!work)
3555 return -ENOMEM;
3556
3557 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3558 spin_lock_irqsave(&cm_id_priv->lock, flags);
3559 switch (cm_id->state)
3560 {
3561 case IB_CM_REP_SENT:
3562 case IB_CM_MRA_REP_RCVD:
3563 cm_id->state = IB_CM_ESTABLISHED;
3564 break;
3565 case IB_CM_ESTABLISHED:
3566 ret = -EISCONN;
3567 break;
3568 default:
3569 ret = -EINVAL;
3570 break;
3571 }
3572 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3573
3574 if (ret) {
3575 kfree(work);
3576 goto out;
3577 }
3578
3579 /*
3580 * The CM worker thread may try to destroy the cm_id before it
3581 * can execute this work item. To prevent potential deadlock,
3582 * we need to find the cm_id once we're in the context of the
3583 * worker thread, rather than holding a reference on it.
3584 */
3585 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3586 work->local_id = cm_id->local_id;
3587 work->remote_id = cm_id->remote_id;
3588 work->mad_recv_wc = NULL;
3589 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3590
3591 /* Check if the device started its remove_one */
3592 spin_lock_irqsave(&cm.lock, flags);
3593 if (!cm_dev->going_down) {
3594 queue_delayed_work(cm.wq, &work->work, 0);
3595 } else {
3596 kfree(work);
3597 ret = -ENODEV;
3598 }
3599 spin_unlock_irqrestore(&cm.lock, flags);
3600
3601 out:
3602 return ret;
3603 }
3604
3605 static int cm_migrate(struct ib_cm_id *cm_id)
3606 {
3607 struct cm_id_private *cm_id_priv;
3608 struct cm_av tmp_av;
3609 unsigned long flags;
3610 int tmp_send_port_not_ready;
3611 int ret = 0;
3612
3613 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3614 spin_lock_irqsave(&cm_id_priv->lock, flags);
3615 if (cm_id->state == IB_CM_ESTABLISHED &&
3616 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3617 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3618 cm_id->lap_state = IB_CM_LAP_IDLE;
3619 /* Swap address vector */
3620 tmp_av = cm_id_priv->av;
3621 cm_id_priv->av = cm_id_priv->alt_av;
3622 cm_id_priv->alt_av = tmp_av;
3623 /* Swap port send ready state */
3624 tmp_send_port_not_ready = cm_id_priv->prim_send_port_not_ready;
3625 cm_id_priv->prim_send_port_not_ready = cm_id_priv->altr_send_port_not_ready;
3626 cm_id_priv->altr_send_port_not_ready = tmp_send_port_not_ready;
3627 } else
3628 ret = -EINVAL;
3629 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3630
3631 return ret;
3632 }
3633
3634 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3635 {
3636 int ret;
3637
3638 switch (event) {
3639 case IB_EVENT_COMM_EST:
3640 ret = cm_establish(cm_id);
3641 break;
3642 case IB_EVENT_PATH_MIG:
3643 ret = cm_migrate(cm_id);
3644 break;
3645 default:
3646 ret = -EINVAL;
3647 }
3648 return ret;
3649 }
3650 EXPORT_SYMBOL(ib_cm_notify);
3651
3652 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3653 struct ib_mad_send_buf *send_buf,
3654 struct ib_mad_recv_wc *mad_recv_wc)
3655 {
3656 struct cm_port *port = mad_agent->context;
3657 struct cm_work *work;
3658 enum ib_cm_event_type event;
3659 u16 attr_id;
3660 int paths = 0;
3661 int going_down = 0;
3662
3663 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3664 case CM_REQ_ATTR_ID:
3665 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3666 alt_local_lid != 0);
3667 event = IB_CM_REQ_RECEIVED;
3668 break;
3669 case CM_MRA_ATTR_ID:
3670 event = IB_CM_MRA_RECEIVED;
3671 break;
3672 case CM_REJ_ATTR_ID:
3673 event = IB_CM_REJ_RECEIVED;
3674 break;
3675 case CM_REP_ATTR_ID:
3676 event = IB_CM_REP_RECEIVED;
3677 break;
3678 case CM_RTU_ATTR_ID:
3679 event = IB_CM_RTU_RECEIVED;
3680 break;
3681 case CM_DREQ_ATTR_ID:
3682 event = IB_CM_DREQ_RECEIVED;
3683 break;
3684 case CM_DREP_ATTR_ID:
3685 event = IB_CM_DREP_RECEIVED;
3686 break;
3687 case CM_SIDR_REQ_ATTR_ID:
3688 event = IB_CM_SIDR_REQ_RECEIVED;
3689 break;
3690 case CM_SIDR_REP_ATTR_ID:
3691 event = IB_CM_SIDR_REP_RECEIVED;
3692 break;
3693 case CM_LAP_ATTR_ID:
3694 paths = 1;
3695 event = IB_CM_LAP_RECEIVED;
3696 break;
3697 case CM_APR_ATTR_ID:
3698 event = IB_CM_APR_RECEIVED;
3699 break;
3700 default:
3701 ib_free_recv_mad(mad_recv_wc);
3702 return;
3703 }
3704
3705 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
3706 atomic_long_inc(&port->counter_group[CM_RECV].
3707 counter[attr_id - CM_ATTR_ID_OFFSET]);
3708
3709 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3710 GFP_KERNEL);
3711 if (!work) {
3712 ib_free_recv_mad(mad_recv_wc);
3713 return;
3714 }
3715
3716 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3717 work->cm_event.event = event;
3718 work->mad_recv_wc = mad_recv_wc;
3719 work->port = port;
3720
3721 /* Check if the device started its remove_one */
3722 spin_lock_irq(&cm.lock);
3723 if (!port->cm_dev->going_down)
3724 queue_delayed_work(cm.wq, &work->work, 0);
3725 else
3726 going_down = 1;
3727 spin_unlock_irq(&cm.lock);
3728
3729 if (going_down) {
3730 kfree(work);
3731 ib_free_recv_mad(mad_recv_wc);
3732 }
3733 }
3734
3735 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3736 struct ib_qp_attr *qp_attr,
3737 int *qp_attr_mask)
3738 {
3739 unsigned long flags;
3740 int ret;
3741
3742 spin_lock_irqsave(&cm_id_priv->lock, flags);
3743 switch (cm_id_priv->id.state) {
3744 case IB_CM_REQ_SENT:
3745 case IB_CM_MRA_REQ_RCVD:
3746 case IB_CM_REQ_RCVD:
3747 case IB_CM_MRA_REQ_SENT:
3748 case IB_CM_REP_RCVD:
3749 case IB_CM_MRA_REP_SENT:
3750 case IB_CM_REP_SENT:
3751 case IB_CM_MRA_REP_RCVD:
3752 case IB_CM_ESTABLISHED:
3753 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3754 IB_QP_PKEY_INDEX | IB_QP_PORT;
3755 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
3756 if (cm_id_priv->responder_resources)
3757 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3758 IB_ACCESS_REMOTE_ATOMIC;
3759 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3760 qp_attr->port_num = cm_id_priv->av.port->port_num;
3761 ret = 0;
3762 break;
3763 default:
3764 ret = -EINVAL;
3765 break;
3766 }
3767 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3768 return ret;
3769 }
3770
3771 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3772 struct ib_qp_attr *qp_attr,
3773 int *qp_attr_mask)
3774 {
3775 unsigned long flags;
3776 int ret;
3777
3778 spin_lock_irqsave(&cm_id_priv->lock, flags);
3779 switch (cm_id_priv->id.state) {
3780 case IB_CM_REQ_RCVD:
3781 case IB_CM_MRA_REQ_SENT:
3782 case IB_CM_REP_RCVD:
3783 case IB_CM_MRA_REP_SENT:
3784 case IB_CM_REP_SENT:
3785 case IB_CM_MRA_REP_RCVD:
3786 case IB_CM_ESTABLISHED:
3787 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3788 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3789 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3790 qp_attr->path_mtu = cm_id_priv->path_mtu;
3791 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3792 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3793 if (cm_id_priv->qp_type == IB_QPT_RC ||
3794 cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
3795 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3796 IB_QP_MIN_RNR_TIMER;
3797 qp_attr->max_dest_rd_atomic =
3798 cm_id_priv->responder_resources;
3799 qp_attr->min_rnr_timer = 0;
3800 }
3801 if (cm_id_priv->alt_av.ah_attr.dlid) {
3802 *qp_attr_mask |= IB_QP_ALT_PATH;
3803 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3804 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3805 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3806 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3807 }
3808 ret = 0;
3809 break;
3810 default:
3811 ret = -EINVAL;
3812 break;
3813 }
3814 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3815 return ret;
3816 }
3817
3818 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3819 struct ib_qp_attr *qp_attr,
3820 int *qp_attr_mask)
3821 {
3822 unsigned long flags;
3823 int ret;
3824
3825 spin_lock_irqsave(&cm_id_priv->lock, flags);
3826 switch (cm_id_priv->id.state) {
3827 /* Allow transition to RTS before sending REP */
3828 case IB_CM_REQ_RCVD:
3829 case IB_CM_MRA_REQ_SENT:
3830
3831 case IB_CM_REP_RCVD:
3832 case IB_CM_MRA_REP_SENT:
3833 case IB_CM_REP_SENT:
3834 case IB_CM_MRA_REP_RCVD:
3835 case IB_CM_ESTABLISHED:
3836 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
3837 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3838 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3839 switch (cm_id_priv->qp_type) {
3840 case IB_QPT_RC:
3841 case IB_QPT_XRC_INI:
3842 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
3843 IB_QP_MAX_QP_RD_ATOMIC;
3844 qp_attr->retry_cnt = cm_id_priv->retry_count;
3845 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3846 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3847 /* fall through */
3848 case IB_QPT_XRC_TGT:
3849 *qp_attr_mask |= IB_QP_TIMEOUT;
3850 qp_attr->timeout = cm_id_priv->av.timeout;
3851 break;
3852 default:
3853 break;
3854 }
3855 if (cm_id_priv->alt_av.ah_attr.dlid) {
3856 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3857 qp_attr->path_mig_state = IB_MIG_REARM;
3858 }
3859 } else {
3860 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
3861 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3862 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3863 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3864 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3865 qp_attr->path_mig_state = IB_MIG_REARM;
3866 }
3867 ret = 0;
3868 break;
3869 default:
3870 ret = -EINVAL;
3871 break;
3872 }
3873 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3874 return ret;
3875 }
3876
3877 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3878 struct ib_qp_attr *qp_attr,
3879 int *qp_attr_mask)
3880 {
3881 struct cm_id_private *cm_id_priv;
3882 int ret;
3883
3884 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3885 switch (qp_attr->qp_state) {
3886 case IB_QPS_INIT:
3887 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3888 break;
3889 case IB_QPS_RTR:
3890 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3891 break;
3892 case IB_QPS_RTS:
3893 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3894 break;
3895 default:
3896 ret = -EINVAL;
3897 break;
3898 }
3899 return ret;
3900 }
3901 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3902
3903 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
3904 char *buf)
3905 {
3906 struct cm_counter_group *group;
3907 struct cm_counter_attribute *cm_attr;
3908
3909 group = container_of(obj, struct cm_counter_group, obj);
3910 cm_attr = container_of(attr, struct cm_counter_attribute, attr);
3911
3912 return sprintf(buf, "%ld\n",
3913 atomic_long_read(&group->counter[cm_attr->index]));
3914 }
3915
3916 static const struct sysfs_ops cm_counter_ops = {
3917 .show = cm_show_counter
3918 };
3919
3920 static struct kobj_type cm_counter_obj_type = {
3921 .sysfs_ops = &cm_counter_ops,
3922 .default_attrs = cm_counter_default_attrs
3923 };
3924
3925 static void cm_release_port_obj(struct kobject *obj)
3926 {
3927 struct cm_port *cm_port;
3928
3929 cm_port = container_of(obj, struct cm_port, port_obj);
3930 kfree(cm_port);
3931 }
3932
3933 static struct kobj_type cm_port_obj_type = {
3934 .release = cm_release_port_obj
3935 };
3936
3937 static char *cm_devnode(struct device *dev, umode_t *mode)
3938 {
3939 if (mode)
3940 *mode = 0666;
3941 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
3942 }
3943
3944 struct class cm_class = {
3945 .owner = THIS_MODULE,
3946 .name = "infiniband_cm",
3947 .devnode = cm_devnode,
3948 };
3949 EXPORT_SYMBOL(cm_class);
3950
3951 static int cm_create_port_fs(struct cm_port *port)
3952 {
3953 int i, ret;
3954
3955 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type,
3956 &port->cm_dev->device->kobj,
3957 "%d", port->port_num);
3958 if (ret) {
3959 kfree(port);
3960 return ret;
3961 }
3962
3963 for (i = 0; i < CM_COUNTER_GROUPS; i++) {
3964 ret = kobject_init_and_add(&port->counter_group[i].obj,
3965 &cm_counter_obj_type,
3966 &port->port_obj,
3967 "%s", counter_group_names[i]);
3968 if (ret)
3969 goto error;
3970 }
3971
3972 return 0;
3973
3974 error:
3975 while (i--)
3976 kobject_put(&port->counter_group[i].obj);
3977 kobject_put(&port->port_obj);
3978 return ret;
3979
3980 }
3981
3982 static void cm_remove_port_fs(struct cm_port *port)
3983 {
3984 int i;
3985
3986 for (i = 0; i < CM_COUNTER_GROUPS; i++)
3987 kobject_put(&port->counter_group[i].obj);
3988
3989 kobject_put(&port->port_obj);
3990 }
3991
3992 static void cm_add_one(struct ib_device *ib_device)
3993 {
3994 struct cm_device *cm_dev;
3995 struct cm_port *port;
3996 struct ib_mad_reg_req reg_req = {
3997 .mgmt_class = IB_MGMT_CLASS_CM,
3998 .mgmt_class_version = IB_CM_CLASS_VERSION,
3999 };
4000 struct ib_port_modify port_modify = {
4001 .set_port_cap_mask = IB_PORT_CM_SUP
4002 };
4003 unsigned long flags;
4004 int ret;
4005 int count = 0;
4006 u8 i;
4007
4008 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) *
4009 ib_device->phys_port_cnt, GFP_KERNEL);
4010 if (!cm_dev)
4011 return;
4012
4013 cm_dev->ib_device = ib_device;
4014 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay;
4015 cm_dev->going_down = 0;
4016 cm_dev->device = device_create(&cm_class, &ib_device->dev,
4017 MKDEV(0, 0), NULL,
4018 "%s", ib_device->name);
4019 if (IS_ERR(cm_dev->device)) {
4020 kfree(cm_dev);
4021 return;
4022 }
4023
4024 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
4025 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
4026 if (!rdma_cap_ib_cm(ib_device, i))
4027 continue;
4028
4029 port = kzalloc(sizeof *port, GFP_KERNEL);
4030 if (!port)
4031 goto error1;
4032
4033 cm_dev->port[i-1] = port;
4034 port->cm_dev = cm_dev;
4035 port->port_num = i;
4036
4037 INIT_LIST_HEAD(&port->cm_priv_prim_list);
4038 INIT_LIST_HEAD(&port->cm_priv_altr_list);
4039
4040 ret = cm_create_port_fs(port);
4041 if (ret)
4042 goto error1;
4043
4044 port->mad_agent = ib_register_mad_agent(ib_device, i,
4045 IB_QPT_GSI,
4046 &reg_req,
4047 0,
4048 cm_send_handler,
4049 cm_recv_handler,
4050 port,
4051 0);
4052 if (IS_ERR(port->mad_agent))
4053 goto error2;
4054
4055 ret = ib_modify_port(ib_device, i, 0, &port_modify);
4056 if (ret)
4057 goto error3;
4058
4059 count++;
4060 }
4061
4062 if (!count)
4063 goto free;
4064
4065 ib_set_client_data(ib_device, &cm_client, cm_dev);
4066
4067 write_lock_irqsave(&cm.device_lock, flags);
4068 list_add_tail(&cm_dev->list, &cm.device_list);
4069 write_unlock_irqrestore(&cm.device_lock, flags);
4070 return;
4071
4072 error3:
4073 ib_unregister_mad_agent(port->mad_agent);
4074 error2:
4075 cm_remove_port_fs(port);
4076 error1:
4077 port_modify.set_port_cap_mask = 0;
4078 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
4079 while (--i) {
4080 if (!rdma_cap_ib_cm(ib_device, i))
4081 continue;
4082
4083 port = cm_dev->port[i-1];
4084 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4085 ib_unregister_mad_agent(port->mad_agent);
4086 cm_remove_port_fs(port);
4087 }
4088 free:
4089 device_unregister(cm_dev->device);
4090 kfree(cm_dev);
4091 }
4092
4093 static void cm_remove_one(struct ib_device *ib_device, void *client_data)
4094 {
4095 struct cm_device *cm_dev = client_data;
4096 struct cm_port *port;
4097 struct cm_id_private *cm_id_priv;
4098 struct ib_mad_agent *cur_mad_agent;
4099 struct ib_port_modify port_modify = {
4100 .clr_port_cap_mask = IB_PORT_CM_SUP
4101 };
4102 unsigned long flags;
4103 int i;
4104
4105 if (!cm_dev)
4106 return;
4107
4108 write_lock_irqsave(&cm.device_lock, flags);
4109 list_del(&cm_dev->list);
4110 write_unlock_irqrestore(&cm.device_lock, flags);
4111
4112 spin_lock_irq(&cm.lock);
4113 cm_dev->going_down = 1;
4114 spin_unlock_irq(&cm.lock);
4115
4116 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
4117 if (!rdma_cap_ib_cm(ib_device, i))
4118 continue;
4119
4120 port = cm_dev->port[i-1];
4121 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4122 /* Mark all the cm_id's as not valid */
4123 spin_lock_irq(&cm.lock);
4124 list_for_each_entry(cm_id_priv, &port->cm_priv_altr_list, altr_list)
4125 cm_id_priv->altr_send_port_not_ready = 1;
4126 list_for_each_entry(cm_id_priv, &port->cm_priv_prim_list, prim_list)
4127 cm_id_priv->prim_send_port_not_ready = 1;
4128 spin_unlock_irq(&cm.lock);
4129 /*
4130 * We flush the queue here after the going_down set, this
4131 * verify that no new works will be queued in the recv handler,
4132 * after that we can call the unregister_mad_agent
4133 */
4134 flush_workqueue(cm.wq);
4135 spin_lock_irq(&cm.state_lock);
4136 cur_mad_agent = port->mad_agent;
4137 port->mad_agent = NULL;
4138 spin_unlock_irq(&cm.state_lock);
4139 ib_unregister_mad_agent(cur_mad_agent);
4140 cm_remove_port_fs(port);
4141 }
4142
4143 device_unregister(cm_dev->device);
4144 kfree(cm_dev);
4145 }
4146
4147 static int __init ib_cm_init(void)
4148 {
4149 int ret;
4150
4151 memset(&cm, 0, sizeof cm);
4152 INIT_LIST_HEAD(&cm.device_list);
4153 rwlock_init(&cm.device_lock);
4154 spin_lock_init(&cm.lock);
4155 spin_lock_init(&cm.state_lock);
4156 cm.listen_service_table = RB_ROOT;
4157 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
4158 cm.remote_id_table = RB_ROOT;
4159 cm.remote_qp_table = RB_ROOT;
4160 cm.remote_sidr_table = RB_ROOT;
4161 idr_init(&cm.local_id_table);
4162 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
4163 INIT_LIST_HEAD(&cm.timewait_list);
4164
4165 ret = class_register(&cm_class);
4166 if (ret) {
4167 ret = -ENOMEM;
4168 goto error1;
4169 }
4170
4171 cm.wq = create_workqueue("ib_cm");
4172 if (!cm.wq) {
4173 ret = -ENOMEM;
4174 goto error2;
4175 }
4176
4177 ret = ib_register_client(&cm_client);
4178 if (ret)
4179 goto error3;
4180
4181 return 0;
4182 error3:
4183 destroy_workqueue(cm.wq);
4184 error2:
4185 class_unregister(&cm_class);
4186 error1:
4187 idr_destroy(&cm.local_id_table);
4188 return ret;
4189 }
4190
4191 static void __exit ib_cm_cleanup(void)
4192 {
4193 struct cm_timewait_info *timewait_info, *tmp;
4194
4195 spin_lock_irq(&cm.lock);
4196 list_for_each_entry(timewait_info, &cm.timewait_list, list)
4197 cancel_delayed_work(&timewait_info->work.work);
4198 spin_unlock_irq(&cm.lock);
4199
4200 ib_unregister_client(&cm_client);
4201 destroy_workqueue(cm.wq);
4202
4203 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
4204 list_del(&timewait_info->list);
4205 kfree(timewait_info);
4206 }
4207
4208 class_unregister(&cm_class);
4209 idr_destroy(&cm.local_id_table);
4210 }
4211
4212 module_init(ib_cm_init);
4213 module_exit(ib_cm_cleanup);
4214
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