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