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