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PCI Hotplug: acpiphp: don't store a pci_dev in acpiphp_func
[linux-2.6/mini2440.git] / drivers / infiniband / core / cm.c
blob5130fc55b8e2739f001389d2392dfd8e49b96125
1 /*
2 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved.
3 * Copyright (c) 2004 Topspin Corporation. All rights reserved.
4 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved.
5 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 */
35
36 #include <linux/completion.h>
37 #include <linux/dma-mapping.h>
38 #include <linux/device.h>
39 #include <linux/err.h>
40 #include <linux/idr.h>
41 #include <linux/interrupt.h>
42 #include <linux/random.h>
43 #include <linux/rbtree.h>
44 #include <linux/spinlock.h>
45 #include <linux/sysfs.h>
46 #include <linux/workqueue.h>
47 #include <linux/kdev_t.h>
48
49 #include <rdma/ib_cache.h>
50 #include <rdma/ib_cm.h>
51 #include "cm_msgs.h"
52
53 MODULE_AUTHOR("Sean Hefty");
54 MODULE_DESCRIPTION("InfiniBand CM");
55 MODULE_LICENSE("Dual BSD/GPL");
56
57 static void cm_add_one(struct ib_device *device);
58 static void cm_remove_one(struct ib_device *device);
59
60 static struct ib_client cm_client = {
61 .name = "cm",
62 .add = cm_add_one,
63 .remove = cm_remove_one
64 };
65
66 static struct ib_cm {
67 spinlock_t lock;
68 struct list_head device_list;
69 rwlock_t device_lock;
70 struct rb_root listen_service_table;
71 u64 listen_service_id;
72 /* struct rb_root peer_service_table; todo: fix peer to peer */
73 struct rb_root remote_qp_table;
74 struct rb_root remote_id_table;
75 struct rb_root remote_sidr_table;
76 struct idr local_id_table;
77 __be32 random_id_operand;
78 struct list_head timewait_list;
79 struct workqueue_struct *wq;
80 } cm;
81
82 /* Counter indexes ordered by attribute ID */
83 enum {
84 CM_REQ_COUNTER,
85 CM_MRA_COUNTER,
86 CM_REJ_COUNTER,
87 CM_REP_COUNTER,
88 CM_RTU_COUNTER,
89 CM_DREQ_COUNTER,
90 CM_DREP_COUNTER,
91 CM_SIDR_REQ_COUNTER,
92 CM_SIDR_REP_COUNTER,
93 CM_LAP_COUNTER,
94 CM_APR_COUNTER,
95 CM_ATTR_COUNT,
96 CM_ATTR_ID_OFFSET = 0x0010,
97 };
98
99 enum {
100 CM_XMIT,
101 CM_XMIT_RETRIES,
102 CM_RECV,
103 CM_RECV_DUPLICATES,
104 CM_COUNTER_GROUPS
105 };
106
107 static char const counter_group_names[CM_COUNTER_GROUPS]
108 [sizeof("cm_rx_duplicates")] = {
109 "cm_tx_msgs", "cm_tx_retries",
110 "cm_rx_msgs", "cm_rx_duplicates"
111 };
112
113 struct cm_counter_group {
114 struct kobject obj;
115 atomic_long_t counter[CM_ATTR_COUNT];
116 };
117
118 struct cm_counter_attribute {
119 struct attribute attr;
120 int index;
121 };
122
123 #define CM_COUNTER_ATTR(_name, _index) \
124 struct cm_counter_attribute cm_##_name##_counter_attr = { \
125 .attr = { .name = __stringify(_name), .mode = 0444 }, \
126 .index = _index \
127 }
128
129 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
130 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
131 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
132 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
133 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
134 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
135 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
136 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
137 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
138 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
139 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
140
141 static struct attribute *cm_counter_default_attrs[] = {
142 &cm_req_counter_attr.attr,
143 &cm_mra_counter_attr.attr,
144 &cm_rej_counter_attr.attr,
145 &cm_rep_counter_attr.attr,
146 &cm_rtu_counter_attr.attr,
147 &cm_dreq_counter_attr.attr,
148 &cm_drep_counter_attr.attr,
149 &cm_sidr_req_counter_attr.attr,
150 &cm_sidr_rep_counter_attr.attr,
151 &cm_lap_counter_attr.attr,
152 &cm_apr_counter_attr.attr,
153 NULL
154 };
155
156 struct cm_port {
157 struct cm_device *cm_dev;
158 struct ib_mad_agent *mad_agent;
159 struct kobject port_obj;
160 u8 port_num;
161 struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
162 };
163
164 struct cm_device {
165 struct list_head list;
166 struct ib_device *ib_device;
167 struct device *device;
168 u8 ack_delay;
169 struct cm_port *port[0];
170 };
171
172 struct cm_av {
173 struct cm_port *port;
174 union ib_gid dgid;
175 struct ib_ah_attr ah_attr;
176 u16 pkey_index;
177 u8 timeout;
178 };
179
180 struct cm_work {
181 struct delayed_work work;
182 struct list_head list;
183 struct cm_port *port;
184 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
185 __be32 local_id; /* Established / timewait */
186 __be32 remote_id;
187 struct ib_cm_event cm_event;
188 struct ib_sa_path_rec path[0];
189 };
190
191 struct cm_timewait_info {
192 struct cm_work work; /* Must be first. */
193 struct list_head list;
194 struct rb_node remote_qp_node;
195 struct rb_node remote_id_node;
196 __be64 remote_ca_guid;
197 __be32 remote_qpn;
198 u8 inserted_remote_qp;
199 u8 inserted_remote_id;
200 };
201
202 struct cm_id_private {
203 struct ib_cm_id id;
204
205 struct rb_node service_node;
206 struct rb_node sidr_id_node;
207 spinlock_t lock; /* Do not acquire inside cm.lock */
208 struct completion comp;
209 atomic_t refcount;
210
211 struct ib_mad_send_buf *msg;
212 struct cm_timewait_info *timewait_info;
213 /* todo: use alternate port on send failure */
214 struct cm_av av;
215 struct cm_av alt_av;
216 struct ib_cm_compare_data *compare_data;
217
218 void *private_data;
219 __be64 tid;
220 __be32 local_qpn;
221 __be32 remote_qpn;
222 enum ib_qp_type qp_type;
223 __be32 sq_psn;
224 __be32 rq_psn;
225 int timeout_ms;
226 enum ib_mtu path_mtu;
227 __be16 pkey;
228 u8 private_data_len;
229 u8 max_cm_retries;
230 u8 peer_to_peer;
231 u8 responder_resources;
232 u8 initiator_depth;
233 u8 retry_count;
234 u8 rnr_retry_count;
235 u8 service_timeout;
236 u8 target_ack_delay;
237
238 struct list_head work_list;
239 atomic_t work_count;
240 };
241
242 static void cm_work_handler(struct work_struct *work);
243
244 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
245 {
246 if (atomic_dec_and_test(&cm_id_priv->refcount))
247 complete(&cm_id_priv->comp);
248 }
249
250 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
251 struct ib_mad_send_buf **msg)
252 {
253 struct ib_mad_agent *mad_agent;
254 struct ib_mad_send_buf *m;
255 struct ib_ah *ah;
256
257 mad_agent = cm_id_priv->av.port->mad_agent;
258 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
259 if (IS_ERR(ah))
260 return PTR_ERR(ah);
261
262 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
263 cm_id_priv->av.pkey_index,
264 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
265 GFP_ATOMIC);
266 if (IS_ERR(m)) {
267 ib_destroy_ah(ah);
268 return PTR_ERR(m);
269 }
270
271 /* Timeout set by caller if response is expected. */
272 m->ah = ah;
273 m->retries = cm_id_priv->max_cm_retries;
274
275 atomic_inc(&cm_id_priv->refcount);
276 m->context[0] = cm_id_priv;
277 *msg = m;
278 return 0;
279 }
280
281 static int cm_alloc_response_msg(struct cm_port *port,
282 struct ib_mad_recv_wc *mad_recv_wc,
283 struct ib_mad_send_buf **msg)
284 {
285 struct ib_mad_send_buf *m;
286 struct ib_ah *ah;
287
288 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
289 mad_recv_wc->recv_buf.grh, port->port_num);
290 if (IS_ERR(ah))
291 return PTR_ERR(ah);
292
293 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
294 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
295 GFP_ATOMIC);
296 if (IS_ERR(m)) {
297 ib_destroy_ah(ah);
298 return PTR_ERR(m);
299 }
300 m->ah = ah;
301 *msg = m;
302 return 0;
303 }
304
305 static void cm_free_msg(struct ib_mad_send_buf *msg)
306 {
307 ib_destroy_ah(msg->ah);
308 if (msg->context[0])
309 cm_deref_id(msg->context[0]);
310 ib_free_send_mad(msg);
311 }
312
313 static void * cm_copy_private_data(const void *private_data,
314 u8 private_data_len)
315 {
316 void *data;
317
318 if (!private_data || !private_data_len)
319 return NULL;
320
321 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
322 if (!data)
323 return ERR_PTR(-ENOMEM);
324
325 return data;
326 }
327
328 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
329 void *private_data, u8 private_data_len)
330 {
331 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
332 kfree(cm_id_priv->private_data);
333
334 cm_id_priv->private_data = private_data;
335 cm_id_priv->private_data_len = private_data_len;
336 }
337
338 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
339 struct ib_grh *grh, struct cm_av *av)
340 {
341 av->port = port;
342 av->pkey_index = wc->pkey_index;
343 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc,
344 grh, &av->ah_attr);
345 }
346
347 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
348 {
349 struct cm_device *cm_dev;
350 struct cm_port *port = NULL;
351 unsigned long flags;
352 int ret;
353 u8 p;
354
355 read_lock_irqsave(&cm.device_lock, flags);
356 list_for_each_entry(cm_dev, &cm.device_list, list) {
357 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid,
358 &p, NULL)) {
359 port = cm_dev->port[p-1];
360 break;
361 }
362 }
363 read_unlock_irqrestore(&cm.device_lock, flags);
364
365 if (!port)
366 return -EINVAL;
367
368 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
369 be16_to_cpu(path->pkey), &av->pkey_index);
370 if (ret)
371 return ret;
372
373 av->port = port;
374 ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path,
375 &av->ah_attr);
376 av->timeout = path->packet_life_time + 1;
377 return 0;
378 }
379
380 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
381 {
382 unsigned long flags;
383 int ret, id;
384 static int next_id;
385
386 do {
387 spin_lock_irqsave(&cm.lock, flags);
388 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv,
389 next_id, &id);
390 if (!ret)
391 next_id = ((unsigned) id + 1) & MAX_ID_MASK;
392 spin_unlock_irqrestore(&cm.lock, flags);
393 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
394
395 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
396 return ret;
397 }
398
399 static void cm_free_id(__be32 local_id)
400 {
401 spin_lock_irq(&cm.lock);
402 idr_remove(&cm.local_id_table,
403 (__force int) (local_id ^ cm.random_id_operand));
404 spin_unlock_irq(&cm.lock);
405 }
406
407 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
408 {
409 struct cm_id_private *cm_id_priv;
410
411 cm_id_priv = idr_find(&cm.local_id_table,
412 (__force int) (local_id ^ cm.random_id_operand));
413 if (cm_id_priv) {
414 if (cm_id_priv->id.remote_id == remote_id)
415 atomic_inc(&cm_id_priv->refcount);
416 else
417 cm_id_priv = NULL;
418 }
419
420 return cm_id_priv;
421 }
422
423 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
424 {
425 struct cm_id_private *cm_id_priv;
426
427 spin_lock_irq(&cm.lock);
428 cm_id_priv = cm_get_id(local_id, remote_id);
429 spin_unlock_irq(&cm.lock);
430
431 return cm_id_priv;
432 }
433
434 static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
435 {
436 int i;
437
438 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
439 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
440 ((unsigned long *) mask)[i];
441 }
442
443 static int cm_compare_data(struct ib_cm_compare_data *src_data,
444 struct ib_cm_compare_data *dst_data)
445 {
446 u8 src[IB_CM_COMPARE_SIZE];
447 u8 dst[IB_CM_COMPARE_SIZE];
448
449 if (!src_data || !dst_data)
450 return 0;
451
452 cm_mask_copy(src, src_data->data, dst_data->mask);
453 cm_mask_copy(dst, dst_data->data, src_data->mask);
454 return memcmp(src, dst, IB_CM_COMPARE_SIZE);
455 }
456
457 static int cm_compare_private_data(u8 *private_data,
458 struct ib_cm_compare_data *dst_data)
459 {
460 u8 src[IB_CM_COMPARE_SIZE];
461
462 if (!dst_data)
463 return 0;
464
465 cm_mask_copy(src, private_data, dst_data->mask);
466 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
467 }
468
469 /*
470 * Trivial helpers to strip endian annotation and compare; the
471 * endianness doesn't actually matter since we just need a stable
472 * order for the RB tree.
473 */
474 static int be32_lt(__be32 a, __be32 b)
475 {
476 return (__force u32) a < (__force u32) b;
477 }
478
479 static int be32_gt(__be32 a, __be32 b)
480 {
481 return (__force u32) a > (__force u32) b;
482 }
483
484 static int be64_lt(__be64 a, __be64 b)
485 {
486 return (__force u64) a < (__force u64) b;
487 }
488
489 static int be64_gt(__be64 a, __be64 b)
490 {
491 return (__force u64) a > (__force u64) b;
492 }
493
494 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
495 {
496 struct rb_node **link = &cm.listen_service_table.rb_node;
497 struct rb_node *parent = NULL;
498 struct cm_id_private *cur_cm_id_priv;
499 __be64 service_id = cm_id_priv->id.service_id;
500 __be64 service_mask = cm_id_priv->id.service_mask;
501 int data_cmp;
502
503 while (*link) {
504 parent = *link;
505 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
506 service_node);
507 data_cmp = cm_compare_data(cm_id_priv->compare_data,
508 cur_cm_id_priv->compare_data);
509 if ((cur_cm_id_priv->id.service_mask & service_id) ==
510 (service_mask & cur_cm_id_priv->id.service_id) &&
511 (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
512 !data_cmp)
513 return cur_cm_id_priv;
514
515 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
516 link = &(*link)->rb_left;
517 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
518 link = &(*link)->rb_right;
519 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
520 link = &(*link)->rb_left;
521 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
522 link = &(*link)->rb_right;
523 else if (data_cmp < 0)
524 link = &(*link)->rb_left;
525 else
526 link = &(*link)->rb_right;
527 }
528 rb_link_node(&cm_id_priv->service_node, parent, link);
529 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
530 return NULL;
531 }
532
533 static struct cm_id_private * cm_find_listen(struct ib_device *device,
534 __be64 service_id,
535 u8 *private_data)
536 {
537 struct rb_node *node = cm.listen_service_table.rb_node;
538 struct cm_id_private *cm_id_priv;
539 int data_cmp;
540
541 while (node) {
542 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
543 data_cmp = cm_compare_private_data(private_data,
544 cm_id_priv->compare_data);
545 if ((cm_id_priv->id.service_mask & service_id) ==
546 cm_id_priv->id.service_id &&
547 (cm_id_priv->id.device == device) && !data_cmp)
548 return cm_id_priv;
549
550 if (device < cm_id_priv->id.device)
551 node = node->rb_left;
552 else if (device > cm_id_priv->id.device)
553 node = node->rb_right;
554 else if (be64_lt(service_id, cm_id_priv->id.service_id))
555 node = node->rb_left;
556 else if (be64_gt(service_id, cm_id_priv->id.service_id))
557 node = node->rb_right;
558 else if (data_cmp < 0)
559 node = node->rb_left;
560 else
561 node = node->rb_right;
562 }
563 return NULL;
564 }
565
566 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
567 *timewait_info)
568 {
569 struct rb_node **link = &cm.remote_id_table.rb_node;
570 struct rb_node *parent = NULL;
571 struct cm_timewait_info *cur_timewait_info;
572 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
573 __be32 remote_id = timewait_info->work.remote_id;
574
575 while (*link) {
576 parent = *link;
577 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
578 remote_id_node);
579 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
580 link = &(*link)->rb_left;
581 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
582 link = &(*link)->rb_right;
583 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
584 link = &(*link)->rb_left;
585 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
586 link = &(*link)->rb_right;
587 else
588 return cur_timewait_info;
589 }
590 timewait_info->inserted_remote_id = 1;
591 rb_link_node(&timewait_info->remote_id_node, parent, link);
592 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
593 return NULL;
594 }
595
596 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
597 __be32 remote_id)
598 {
599 struct rb_node *node = cm.remote_id_table.rb_node;
600 struct cm_timewait_info *timewait_info;
601
602 while (node) {
603 timewait_info = rb_entry(node, struct cm_timewait_info,
604 remote_id_node);
605 if (be32_lt(remote_id, timewait_info->work.remote_id))
606 node = node->rb_left;
607 else if (be32_gt(remote_id, timewait_info->work.remote_id))
608 node = node->rb_right;
609 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
610 node = node->rb_left;
611 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
612 node = node->rb_right;
613 else
614 return timewait_info;
615 }
616 return NULL;
617 }
618
619 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
620 *timewait_info)
621 {
622 struct rb_node **link = &cm.remote_qp_table.rb_node;
623 struct rb_node *parent = NULL;
624 struct cm_timewait_info *cur_timewait_info;
625 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
626 __be32 remote_qpn = timewait_info->remote_qpn;
627
628 while (*link) {
629 parent = *link;
630 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
631 remote_qp_node);
632 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
633 link = &(*link)->rb_left;
634 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
635 link = &(*link)->rb_right;
636 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
637 link = &(*link)->rb_left;
638 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
639 link = &(*link)->rb_right;
640 else
641 return cur_timewait_info;
642 }
643 timewait_info->inserted_remote_qp = 1;
644 rb_link_node(&timewait_info->remote_qp_node, parent, link);
645 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
646 return NULL;
647 }
648
649 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
650 *cm_id_priv)
651 {
652 struct rb_node **link = &cm.remote_sidr_table.rb_node;
653 struct rb_node *parent = NULL;
654 struct cm_id_private *cur_cm_id_priv;
655 union ib_gid *port_gid = &cm_id_priv->av.dgid;
656 __be32 remote_id = cm_id_priv->id.remote_id;
657
658 while (*link) {
659 parent = *link;
660 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
661 sidr_id_node);
662 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
663 link = &(*link)->rb_left;
664 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
665 link = &(*link)->rb_right;
666 else {
667 int cmp;
668 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
669 sizeof *port_gid);
670 if (cmp < 0)
671 link = &(*link)->rb_left;
672 else if (cmp > 0)
673 link = &(*link)->rb_right;
674 else
675 return cur_cm_id_priv;
676 }
677 }
678 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
679 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
680 return NULL;
681 }
682
683 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
684 enum ib_cm_sidr_status status)
685 {
686 struct ib_cm_sidr_rep_param param;
687
688 memset(&param, 0, sizeof param);
689 param.status = status;
690 ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
691 }
692
693 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
694 ib_cm_handler cm_handler,
695 void *context)
696 {
697 struct cm_id_private *cm_id_priv;
698 int ret;
699
700 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
701 if (!cm_id_priv)
702 return ERR_PTR(-ENOMEM);
703
704 cm_id_priv->id.state = IB_CM_IDLE;
705 cm_id_priv->id.device = device;
706 cm_id_priv->id.cm_handler = cm_handler;
707 cm_id_priv->id.context = context;
708 cm_id_priv->id.remote_cm_qpn = 1;
709 ret = cm_alloc_id(cm_id_priv);
710 if (ret)
711 goto error;
712
713 spin_lock_init(&cm_id_priv->lock);
714 init_completion(&cm_id_priv->comp);
715 INIT_LIST_HEAD(&cm_id_priv->work_list);
716 atomic_set(&cm_id_priv->work_count, -1);
717 atomic_set(&cm_id_priv->refcount, 1);
718 return &cm_id_priv->id;
719
720 error:
721 kfree(cm_id_priv);
722 return ERR_PTR(-ENOMEM);
723 }
724 EXPORT_SYMBOL(ib_create_cm_id);
725
726 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
727 {
728 struct cm_work *work;
729
730 if (list_empty(&cm_id_priv->work_list))
731 return NULL;
732
733 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
734 list_del(&work->list);
735 return work;
736 }
737
738 static void cm_free_work(struct cm_work *work)
739 {
740 if (work->mad_recv_wc)
741 ib_free_recv_mad(work->mad_recv_wc);
742 kfree(work);
743 }
744
745 static inline int cm_convert_to_ms(int iba_time)
746 {
747 /* approximate conversion to ms from 4.096us x 2^iba_time */
748 return 1 << max(iba_time - 8, 0);
749 }
750
751 /*
752 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
753 * Because of how ack_timeout is stored, adding one doubles the timeout.
754 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
755 * increment it (round up) only if the other is within 50%.
756 */
757 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
758 {
759 int ack_timeout = packet_life_time + 1;
760
761 if (ack_timeout >= ca_ack_delay)
762 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
763 else
764 ack_timeout = ca_ack_delay +
765 (ack_timeout >= (ca_ack_delay - 1));
766
767 return min(31, ack_timeout);
768 }
769
770 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
771 {
772 if (timewait_info->inserted_remote_id) {
773 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
774 timewait_info->inserted_remote_id = 0;
775 }
776
777 if (timewait_info->inserted_remote_qp) {
778 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
779 timewait_info->inserted_remote_qp = 0;
780 }
781 }
782
783 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
784 {
785 struct cm_timewait_info *timewait_info;
786
787 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
788 if (!timewait_info)
789 return ERR_PTR(-ENOMEM);
790
791 timewait_info->work.local_id = local_id;
792 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
793 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
794 return timewait_info;
795 }
796
797 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
798 {
799 int wait_time;
800 unsigned long flags;
801
802 spin_lock_irqsave(&cm.lock, flags);
803 cm_cleanup_timewait(cm_id_priv->timewait_info);
804 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
805 spin_unlock_irqrestore(&cm.lock, flags);
806
807 /*
808 * The cm_id could be destroyed by the user before we exit timewait.
809 * To protect against this, we search for the cm_id after exiting
810 * timewait before notifying the user that we've exited timewait.
811 */
812 cm_id_priv->id.state = IB_CM_TIMEWAIT;
813 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
814 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
815 msecs_to_jiffies(wait_time));
816 cm_id_priv->timewait_info = NULL;
817 }
818
819 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
820 {
821 unsigned long flags;
822
823 cm_id_priv->id.state = IB_CM_IDLE;
824 if (cm_id_priv->timewait_info) {
825 spin_lock_irqsave(&cm.lock, flags);
826 cm_cleanup_timewait(cm_id_priv->timewait_info);
827 spin_unlock_irqrestore(&cm.lock, flags);
828 kfree(cm_id_priv->timewait_info);
829 cm_id_priv->timewait_info = NULL;
830 }
831 }
832
833 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
834 {
835 struct cm_id_private *cm_id_priv;
836 struct cm_work *work;
837
838 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
839 retest:
840 spin_lock_irq(&cm_id_priv->lock);
841 switch (cm_id->state) {
842 case IB_CM_LISTEN:
843 cm_id->state = IB_CM_IDLE;
844 spin_unlock_irq(&cm_id_priv->lock);
845 spin_lock_irq(&cm.lock);
846 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
847 spin_unlock_irq(&cm.lock);
848 break;
849 case IB_CM_SIDR_REQ_SENT:
850 cm_id->state = IB_CM_IDLE;
851 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
852 spin_unlock_irq(&cm_id_priv->lock);
853 break;
854 case IB_CM_SIDR_REQ_RCVD:
855 spin_unlock_irq(&cm_id_priv->lock);
856 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
857 break;
858 case IB_CM_REQ_SENT:
859 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
860 spin_unlock_irq(&cm_id_priv->lock);
861 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
862 &cm_id_priv->id.device->node_guid,
863 sizeof cm_id_priv->id.device->node_guid,
864 NULL, 0);
865 break;
866 case IB_CM_REQ_RCVD:
867 if (err == -ENOMEM) {
868 /* Do not reject to allow future retries. */
869 cm_reset_to_idle(cm_id_priv);
870 spin_unlock_irq(&cm_id_priv->lock);
871 } else {
872 spin_unlock_irq(&cm_id_priv->lock);
873 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
874 NULL, 0, NULL, 0);
875 }
876 break;
877 case IB_CM_MRA_REQ_RCVD:
878 case IB_CM_REP_SENT:
879 case IB_CM_MRA_REP_RCVD:
880 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
881 /* Fall through */
882 case IB_CM_MRA_REQ_SENT:
883 case IB_CM_REP_RCVD:
884 case IB_CM_MRA_REP_SENT:
885 spin_unlock_irq(&cm_id_priv->lock);
886 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
887 NULL, 0, NULL, 0);
888 break;
889 case IB_CM_ESTABLISHED:
890 spin_unlock_irq(&cm_id_priv->lock);
891 ib_send_cm_dreq(cm_id, NULL, 0);
892 goto retest;
893 case IB_CM_DREQ_SENT:
894 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
895 cm_enter_timewait(cm_id_priv);
896 spin_unlock_irq(&cm_id_priv->lock);
897 break;
898 case IB_CM_DREQ_RCVD:
899 spin_unlock_irq(&cm_id_priv->lock);
900 ib_send_cm_drep(cm_id, NULL, 0);
901 break;
902 default:
903 spin_unlock_irq(&cm_id_priv->lock);
904 break;
905 }
906
907 cm_free_id(cm_id->local_id);
908 cm_deref_id(cm_id_priv);
909 wait_for_completion(&cm_id_priv->comp);
910 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
911 cm_free_work(work);
912 kfree(cm_id_priv->compare_data);
913 kfree(cm_id_priv->private_data);
914 kfree(cm_id_priv);
915 }
916
917 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
918 {
919 cm_destroy_id(cm_id, 0);
920 }
921 EXPORT_SYMBOL(ib_destroy_cm_id);
922
923 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
924 struct ib_cm_compare_data *compare_data)
925 {
926 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
927 unsigned long flags;
928 int ret = 0;
929
930 service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
931 service_id &= service_mask;
932 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
933 (service_id != IB_CM_ASSIGN_SERVICE_ID))
934 return -EINVAL;
935
936 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
937 if (cm_id->state != IB_CM_IDLE)
938 return -EINVAL;
939
940 if (compare_data) {
941 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
942 GFP_KERNEL);
943 if (!cm_id_priv->compare_data)
944 return -ENOMEM;
945 cm_mask_copy(cm_id_priv->compare_data->data,
946 compare_data->data, compare_data->mask);
947 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
948 IB_CM_COMPARE_SIZE);
949 }
950
951 cm_id->state = IB_CM_LISTEN;
952
953 spin_lock_irqsave(&cm.lock, flags);
954 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
955 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
956 cm_id->service_mask = ~cpu_to_be64(0);
957 } else {
958 cm_id->service_id = service_id;
959 cm_id->service_mask = service_mask;
960 }
961 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
962 spin_unlock_irqrestore(&cm.lock, flags);
963
964 if (cur_cm_id_priv) {
965 cm_id->state = IB_CM_IDLE;
966 kfree(cm_id_priv->compare_data);
967 cm_id_priv->compare_data = NULL;
968 ret = -EBUSY;
969 }
970 return ret;
971 }
972 EXPORT_SYMBOL(ib_cm_listen);
973
974 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
975 enum cm_msg_sequence msg_seq)
976 {
977 u64 hi_tid, low_tid;
978
979 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
980 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
981 (msg_seq << 30));
982 return cpu_to_be64(hi_tid | low_tid);
983 }
984
985 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
986 __be16 attr_id, __be64 tid)
987 {
988 hdr->base_version = IB_MGMT_BASE_VERSION;
989 hdr->mgmt_class = IB_MGMT_CLASS_CM;
990 hdr->class_version = IB_CM_CLASS_VERSION;
991 hdr->method = IB_MGMT_METHOD_SEND;
992 hdr->attr_id = attr_id;
993 hdr->tid = tid;
994 }
995
996 static void cm_format_req(struct cm_req_msg *req_msg,
997 struct cm_id_private *cm_id_priv,
998 struct ib_cm_req_param *param)
999 {
1000 struct ib_sa_path_rec *pri_path = param->primary_path;
1001 struct ib_sa_path_rec *alt_path = param->alternate_path;
1002
1003 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1004 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
1005
1006 req_msg->local_comm_id = cm_id_priv->id.local_id;
1007 req_msg->service_id = param->service_id;
1008 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1009 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
1010 cm_req_set_resp_res(req_msg, param->responder_resources);
1011 cm_req_set_init_depth(req_msg, param->initiator_depth);
1012 cm_req_set_remote_resp_timeout(req_msg,
1013 param->remote_cm_response_timeout);
1014 cm_req_set_qp_type(req_msg, param->qp_type);
1015 cm_req_set_flow_ctrl(req_msg, param->flow_control);
1016 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
1017 cm_req_set_local_resp_timeout(req_msg,
1018 param->local_cm_response_timeout);
1019 cm_req_set_retry_count(req_msg, param->retry_count);
1020 req_msg->pkey = param->primary_path->pkey;
1021 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
1022 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
1023 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
1024 cm_req_set_srq(req_msg, param->srq);
1025
1026 if (pri_path->hop_limit <= 1) {
1027 req_msg->primary_local_lid = pri_path->slid;
1028 req_msg->primary_remote_lid = pri_path->dlid;
1029 } else {
1030 /* Work-around until there's a way to obtain remote LID info */
1031 req_msg->primary_local_lid = IB_LID_PERMISSIVE;
1032 req_msg->primary_remote_lid = IB_LID_PERMISSIVE;
1033 }
1034 req_msg->primary_local_gid = pri_path->sgid;
1035 req_msg->primary_remote_gid = pri_path->dgid;
1036 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label);
1037 cm_req_set_primary_packet_rate(req_msg, pri_path->rate);
1038 req_msg->primary_traffic_class = pri_path->traffic_class;
1039 req_msg->primary_hop_limit = pri_path->hop_limit;
1040 cm_req_set_primary_sl(req_msg, pri_path->sl);
1041 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1));
1042 cm_req_set_primary_local_ack_timeout(req_msg,
1043 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1044 pri_path->packet_life_time));
1045
1046 if (alt_path) {
1047 if (alt_path->hop_limit <= 1) {
1048 req_msg->alt_local_lid = alt_path->slid;
1049 req_msg->alt_remote_lid = alt_path->dlid;
1050 } else {
1051 req_msg->alt_local_lid = IB_LID_PERMISSIVE;
1052 req_msg->alt_remote_lid = IB_LID_PERMISSIVE;
1053 }
1054 req_msg->alt_local_gid = alt_path->sgid;
1055 req_msg->alt_remote_gid = alt_path->dgid;
1056 cm_req_set_alt_flow_label(req_msg,
1057 alt_path->flow_label);
1058 cm_req_set_alt_packet_rate(req_msg, alt_path->rate);
1059 req_msg->alt_traffic_class = alt_path->traffic_class;
1060 req_msg->alt_hop_limit = alt_path->hop_limit;
1061 cm_req_set_alt_sl(req_msg, alt_path->sl);
1062 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1));
1063 cm_req_set_alt_local_ack_timeout(req_msg,
1064 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1065 alt_path->packet_life_time));
1066 }
1067
1068 if (param->private_data && param->private_data_len)
1069 memcpy(req_msg->private_data, param->private_data,
1070 param->private_data_len);
1071 }
1072
1073 static int cm_validate_req_param(struct ib_cm_req_param *param)
1074 {
1075 /* peer-to-peer not supported */
1076 if (param->peer_to_peer)
1077 return -EINVAL;
1078
1079 if (!param->primary_path)
1080 return -EINVAL;
1081
1082 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
1083 return -EINVAL;
1084
1085 if (param->private_data &&
1086 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1087 return -EINVAL;
1088
1089 if (param->alternate_path &&
1090 (param->alternate_path->pkey != param->primary_path->pkey ||
1091 param->alternate_path->mtu != param->primary_path->mtu))
1092 return -EINVAL;
1093
1094 return 0;
1095 }
1096
1097 int ib_send_cm_req(struct ib_cm_id *cm_id,
1098 struct ib_cm_req_param *param)
1099 {
1100 struct cm_id_private *cm_id_priv;
1101 struct cm_req_msg *req_msg;
1102 unsigned long flags;
1103 int ret;
1104
1105 ret = cm_validate_req_param(param);
1106 if (ret)
1107 return ret;
1108
1109 /* Verify that we're not in timewait. */
1110 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1111 spin_lock_irqsave(&cm_id_priv->lock, flags);
1112 if (cm_id->state != IB_CM_IDLE) {
1113 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1114 ret = -EINVAL;
1115 goto out;
1116 }
1117 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1118
1119 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1120 id.local_id);
1121 if (IS_ERR(cm_id_priv->timewait_info)) {
1122 ret = PTR_ERR(cm_id_priv->timewait_info);
1123 goto out;
1124 }
1125
1126 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
1127 if (ret)
1128 goto error1;
1129 if (param->alternate_path) {
1130 ret = cm_init_av_by_path(param->alternate_path,
1131 &cm_id_priv->alt_av);
1132 if (ret)
1133 goto error1;
1134 }
1135 cm_id->service_id = param->service_id;
1136 cm_id->service_mask = ~cpu_to_be64(0);
1137 cm_id_priv->timeout_ms = cm_convert_to_ms(
1138 param->primary_path->packet_life_time) * 2 +
1139 cm_convert_to_ms(
1140 param->remote_cm_response_timeout);
1141 cm_id_priv->max_cm_retries = param->max_cm_retries;
1142 cm_id_priv->initiator_depth = param->initiator_depth;
1143 cm_id_priv->responder_resources = param->responder_resources;
1144 cm_id_priv->retry_count = param->retry_count;
1145 cm_id_priv->path_mtu = param->primary_path->mtu;
1146 cm_id_priv->pkey = param->primary_path->pkey;
1147 cm_id_priv->qp_type = param->qp_type;
1148
1149 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1150 if (ret)
1151 goto error1;
1152
1153 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1154 cm_format_req(req_msg, cm_id_priv, param);
1155 cm_id_priv->tid = req_msg->hdr.tid;
1156 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1157 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1158
1159 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1160 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1161
1162 spin_lock_irqsave(&cm_id_priv->lock, flags);
1163 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1164 if (ret) {
1165 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1166 goto error2;
1167 }
1168 BUG_ON(cm_id->state != IB_CM_IDLE);
1169 cm_id->state = IB_CM_REQ_SENT;
1170 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1171 return 0;
1172
1173 error2: cm_free_msg(cm_id_priv->msg);
1174 error1: kfree(cm_id_priv->timewait_info);
1175 out: return ret;
1176 }
1177 EXPORT_SYMBOL(ib_send_cm_req);
1178
1179 static int cm_issue_rej(struct cm_port *port,
1180 struct ib_mad_recv_wc *mad_recv_wc,
1181 enum ib_cm_rej_reason reason,
1182 enum cm_msg_response msg_rejected,
1183 void *ari, u8 ari_length)
1184 {
1185 struct ib_mad_send_buf *msg = NULL;
1186 struct cm_rej_msg *rej_msg, *rcv_msg;
1187 int ret;
1188
1189 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1190 if (ret)
1191 return ret;
1192
1193 /* We just need common CM header information. Cast to any message. */
1194 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1195 rej_msg = (struct cm_rej_msg *) msg->mad;
1196
1197 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1198 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1199 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1200 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1201 rej_msg->reason = cpu_to_be16(reason);
1202
1203 if (ari && ari_length) {
1204 cm_rej_set_reject_info_len(rej_msg, ari_length);
1205 memcpy(rej_msg->ari, ari, ari_length);
1206 }
1207
1208 ret = ib_post_send_mad(msg, NULL);
1209 if (ret)
1210 cm_free_msg(msg);
1211
1212 return ret;
1213 }
1214
1215 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1216 __be32 local_qpn, __be32 remote_qpn)
1217 {
1218 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1219 ((local_ca_guid == remote_ca_guid) &&
1220 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1221 }
1222
1223 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1224 struct ib_sa_path_rec *primary_path,
1225 struct ib_sa_path_rec *alt_path)
1226 {
1227 memset(primary_path, 0, sizeof *primary_path);
1228 primary_path->dgid = req_msg->primary_local_gid;
1229 primary_path->sgid = req_msg->primary_remote_gid;
1230 primary_path->dlid = req_msg->primary_local_lid;
1231 primary_path->slid = req_msg->primary_remote_lid;
1232 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1233 primary_path->hop_limit = req_msg->primary_hop_limit;
1234 primary_path->traffic_class = req_msg->primary_traffic_class;
1235 primary_path->reversible = 1;
1236 primary_path->pkey = req_msg->pkey;
1237 primary_path->sl = cm_req_get_primary_sl(req_msg);
1238 primary_path->mtu_selector = IB_SA_EQ;
1239 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1240 primary_path->rate_selector = IB_SA_EQ;
1241 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1242 primary_path->packet_life_time_selector = IB_SA_EQ;
1243 primary_path->packet_life_time =
1244 cm_req_get_primary_local_ack_timeout(req_msg);
1245 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1246
1247 if (req_msg->alt_local_lid) {
1248 memset(alt_path, 0, sizeof *alt_path);
1249 alt_path->dgid = req_msg->alt_local_gid;
1250 alt_path->sgid = req_msg->alt_remote_gid;
1251 alt_path->dlid = req_msg->alt_local_lid;
1252 alt_path->slid = req_msg->alt_remote_lid;
1253 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1254 alt_path->hop_limit = req_msg->alt_hop_limit;
1255 alt_path->traffic_class = req_msg->alt_traffic_class;
1256 alt_path->reversible = 1;
1257 alt_path->pkey = req_msg->pkey;
1258 alt_path->sl = cm_req_get_alt_sl(req_msg);
1259 alt_path->mtu_selector = IB_SA_EQ;
1260 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1261 alt_path->rate_selector = IB_SA_EQ;
1262 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1263 alt_path->packet_life_time_selector = IB_SA_EQ;
1264 alt_path->packet_life_time =
1265 cm_req_get_alt_local_ack_timeout(req_msg);
1266 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1267 }
1268 }
1269
1270 static void cm_format_req_event(struct cm_work *work,
1271 struct cm_id_private *cm_id_priv,
1272 struct ib_cm_id *listen_id)
1273 {
1274 struct cm_req_msg *req_msg;
1275 struct ib_cm_req_event_param *param;
1276
1277 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1278 param = &work->cm_event.param.req_rcvd;
1279 param->listen_id = listen_id;
1280 param->port = cm_id_priv->av.port->port_num;
1281 param->primary_path = &work->path[0];
1282 if (req_msg->alt_local_lid)
1283 param->alternate_path = &work->path[1];
1284 else
1285 param->alternate_path = NULL;
1286 param->remote_ca_guid = req_msg->local_ca_guid;
1287 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1288 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1289 param->qp_type = cm_req_get_qp_type(req_msg);
1290 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1291 param->responder_resources = cm_req_get_init_depth(req_msg);
1292 param->initiator_depth = cm_req_get_resp_res(req_msg);
1293 param->local_cm_response_timeout =
1294 cm_req_get_remote_resp_timeout(req_msg);
1295 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1296 param->remote_cm_response_timeout =
1297 cm_req_get_local_resp_timeout(req_msg);
1298 param->retry_count = cm_req_get_retry_count(req_msg);
1299 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1300 param->srq = cm_req_get_srq(req_msg);
1301 work->cm_event.private_data = &req_msg->private_data;
1302 }
1303
1304 static void cm_process_work(struct cm_id_private *cm_id_priv,
1305 struct cm_work *work)
1306 {
1307 int ret;
1308
1309 /* We will typically only have the current event to report. */
1310 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1311 cm_free_work(work);
1312
1313 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1314 spin_lock_irq(&cm_id_priv->lock);
1315 work = cm_dequeue_work(cm_id_priv);
1316 spin_unlock_irq(&cm_id_priv->lock);
1317 BUG_ON(!work);
1318 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1319 &work->cm_event);
1320 cm_free_work(work);
1321 }
1322 cm_deref_id(cm_id_priv);
1323 if (ret)
1324 cm_destroy_id(&cm_id_priv->id, ret);
1325 }
1326
1327 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1328 struct cm_id_private *cm_id_priv,
1329 enum cm_msg_response msg_mraed, u8 service_timeout,
1330 const void *private_data, u8 private_data_len)
1331 {
1332 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1333 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1334 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1335 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1336 cm_mra_set_service_timeout(mra_msg, service_timeout);
1337
1338 if (private_data && private_data_len)
1339 memcpy(mra_msg->private_data, private_data, private_data_len);
1340 }
1341
1342 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1343 struct cm_id_private *cm_id_priv,
1344 enum ib_cm_rej_reason reason,
1345 void *ari,
1346 u8 ari_length,
1347 const void *private_data,
1348 u8 private_data_len)
1349 {
1350 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1351 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1352
1353 switch(cm_id_priv->id.state) {
1354 case IB_CM_REQ_RCVD:
1355 rej_msg->local_comm_id = 0;
1356 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1357 break;
1358 case IB_CM_MRA_REQ_SENT:
1359 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1360 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1361 break;
1362 case IB_CM_REP_RCVD:
1363 case IB_CM_MRA_REP_SENT:
1364 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1365 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1366 break;
1367 default:
1368 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1369 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1370 break;
1371 }
1372
1373 rej_msg->reason = cpu_to_be16(reason);
1374 if (ari && ari_length) {
1375 cm_rej_set_reject_info_len(rej_msg, ari_length);
1376 memcpy(rej_msg->ari, ari, ari_length);
1377 }
1378
1379 if (private_data && private_data_len)
1380 memcpy(rej_msg->private_data, private_data, private_data_len);
1381 }
1382
1383 static void cm_dup_req_handler(struct cm_work *work,
1384 struct cm_id_private *cm_id_priv)
1385 {
1386 struct ib_mad_send_buf *msg = NULL;
1387 int ret;
1388
1389 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1390 counter[CM_REQ_COUNTER]);
1391
1392 /* Quick state check to discard duplicate REQs. */
1393 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1394 return;
1395
1396 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1397 if (ret)
1398 return;
1399
1400 spin_lock_irq(&cm_id_priv->lock);
1401 switch (cm_id_priv->id.state) {
1402 case IB_CM_MRA_REQ_SENT:
1403 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1404 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1405 cm_id_priv->private_data,
1406 cm_id_priv->private_data_len);
1407 break;
1408 case IB_CM_TIMEWAIT:
1409 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1410 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1411 break;
1412 default:
1413 goto unlock;
1414 }
1415 spin_unlock_irq(&cm_id_priv->lock);
1416
1417 ret = ib_post_send_mad(msg, NULL);
1418 if (ret)
1419 goto free;
1420 return;
1421
1422 unlock: spin_unlock_irq(&cm_id_priv->lock);
1423 free: cm_free_msg(msg);
1424 }
1425
1426 static struct cm_id_private * cm_match_req(struct cm_work *work,
1427 struct cm_id_private *cm_id_priv)
1428 {
1429 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1430 struct cm_timewait_info *timewait_info;
1431 struct cm_req_msg *req_msg;
1432
1433 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1434
1435 /* Check for possible duplicate REQ. */
1436 spin_lock_irq(&cm.lock);
1437 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1438 if (timewait_info) {
1439 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1440 timewait_info->work.remote_id);
1441 spin_unlock_irq(&cm.lock);
1442 if (cur_cm_id_priv) {
1443 cm_dup_req_handler(work, cur_cm_id_priv);
1444 cm_deref_id(cur_cm_id_priv);
1445 }
1446 return NULL;
1447 }
1448
1449 /* Check for stale connections. */
1450 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1451 if (timewait_info) {
1452 cm_cleanup_timewait(cm_id_priv->timewait_info);
1453 spin_unlock_irq(&cm.lock);
1454 cm_issue_rej(work->port, work->mad_recv_wc,
1455 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1456 NULL, 0);
1457 return NULL;
1458 }
1459
1460 /* Find matching listen request. */
1461 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1462 req_msg->service_id,
1463 req_msg->private_data);
1464 if (!listen_cm_id_priv) {
1465 cm_cleanup_timewait(cm_id_priv->timewait_info);
1466 spin_unlock_irq(&cm.lock);
1467 cm_issue_rej(work->port, work->mad_recv_wc,
1468 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1469 NULL, 0);
1470 goto out;
1471 }
1472 atomic_inc(&listen_cm_id_priv->refcount);
1473 atomic_inc(&cm_id_priv->refcount);
1474 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1475 atomic_inc(&cm_id_priv->work_count);
1476 spin_unlock_irq(&cm.lock);
1477 out:
1478 return listen_cm_id_priv;
1479 }
1480
1481 /*
1482 * Work-around for inter-subnet connections. If the LIDs are permissive,
1483 * we need to override the LID/SL data in the REQ with the LID information
1484 * in the work completion.
1485 */
1486 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
1487 {
1488 if (!cm_req_get_primary_subnet_local(req_msg)) {
1489 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) {
1490 req_msg->primary_local_lid = cpu_to_be16(wc->slid);
1491 cm_req_set_primary_sl(req_msg, wc->sl);
1492 }
1493
1494 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE)
1495 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1496 }
1497
1498 if (!cm_req_get_alt_subnet_local(req_msg)) {
1499 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) {
1500 req_msg->alt_local_lid = cpu_to_be16(wc->slid);
1501 cm_req_set_alt_sl(req_msg, wc->sl);
1502 }
1503
1504 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE)
1505 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1506 }
1507 }
1508
1509 static int cm_req_handler(struct cm_work *work)
1510 {
1511 struct ib_cm_id *cm_id;
1512 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1513 struct cm_req_msg *req_msg;
1514 int ret;
1515
1516 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1517
1518 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
1519 if (IS_ERR(cm_id))
1520 return PTR_ERR(cm_id);
1521
1522 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1523 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1524 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1525 work->mad_recv_wc->recv_buf.grh,
1526 &cm_id_priv->av);
1527 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1528 id.local_id);
1529 if (IS_ERR(cm_id_priv->timewait_info)) {
1530 ret = PTR_ERR(cm_id_priv->timewait_info);
1531 goto destroy;
1532 }
1533 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1534 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1535 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1536
1537 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1538 if (!listen_cm_id_priv) {
1539 ret = -EINVAL;
1540 kfree(cm_id_priv->timewait_info);
1541 goto destroy;
1542 }
1543
1544 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1545 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1546 cm_id_priv->id.service_id = req_msg->service_id;
1547 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
1548
1549 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
1550 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1551 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1552 if (ret) {
1553 ib_get_cached_gid(work->port->cm_dev->ib_device,
1554 work->port->port_num, 0, &work->path[0].sgid);
1555 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1556 &work->path[0].sgid, sizeof work->path[0].sgid,
1557 NULL, 0);
1558 goto rejected;
1559 }
1560 if (req_msg->alt_local_lid) {
1561 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1562 if (ret) {
1563 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1564 &work->path[0].sgid,
1565 sizeof work->path[0].sgid, NULL, 0);
1566 goto rejected;
1567 }
1568 }
1569 cm_id_priv->tid = req_msg->hdr.tid;
1570 cm_id_priv->timeout_ms = cm_convert_to_ms(
1571 cm_req_get_local_resp_timeout(req_msg));
1572 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1573 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1574 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1575 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1576 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1577 cm_id_priv->pkey = req_msg->pkey;
1578 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1579 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1580 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1581 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1582
1583 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1584 cm_process_work(cm_id_priv, work);
1585 cm_deref_id(listen_cm_id_priv);
1586 return 0;
1587
1588 rejected:
1589 atomic_dec(&cm_id_priv->refcount);
1590 cm_deref_id(listen_cm_id_priv);
1591 destroy:
1592 ib_destroy_cm_id(cm_id);
1593 return ret;
1594 }
1595
1596 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1597 struct cm_id_private *cm_id_priv,
1598 struct ib_cm_rep_param *param)
1599 {
1600 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1601 rep_msg->local_comm_id = cm_id_priv->id.local_id;
1602 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1603 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1604 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1605 rep_msg->resp_resources = param->responder_resources;
1606 rep_msg->initiator_depth = param->initiator_depth;
1607 cm_rep_set_target_ack_delay(rep_msg,
1608 cm_id_priv->av.port->cm_dev->ack_delay);
1609 cm_rep_set_failover(rep_msg, param->failover_accepted);
1610 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1611 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1612 cm_rep_set_srq(rep_msg, param->srq);
1613 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1614
1615 if (param->private_data && param->private_data_len)
1616 memcpy(rep_msg->private_data, param->private_data,
1617 param->private_data_len);
1618 }
1619
1620 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1621 struct ib_cm_rep_param *param)
1622 {
1623 struct cm_id_private *cm_id_priv;
1624 struct ib_mad_send_buf *msg;
1625 struct cm_rep_msg *rep_msg;
1626 unsigned long flags;
1627 int ret;
1628
1629 if (param->private_data &&
1630 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1631 return -EINVAL;
1632
1633 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1634 spin_lock_irqsave(&cm_id_priv->lock, flags);
1635 if (cm_id->state != IB_CM_REQ_RCVD &&
1636 cm_id->state != IB_CM_MRA_REQ_SENT) {
1637 ret = -EINVAL;
1638 goto out;
1639 }
1640
1641 ret = cm_alloc_msg(cm_id_priv, &msg);
1642 if (ret)
1643 goto out;
1644
1645 rep_msg = (struct cm_rep_msg *) msg->mad;
1646 cm_format_rep(rep_msg, cm_id_priv, param);
1647 msg->timeout_ms = cm_id_priv->timeout_ms;
1648 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1649
1650 ret = ib_post_send_mad(msg, NULL);
1651 if (ret) {
1652 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1653 cm_free_msg(msg);
1654 return ret;
1655 }
1656
1657 cm_id->state = IB_CM_REP_SENT;
1658 cm_id_priv->msg = msg;
1659 cm_id_priv->initiator_depth = param->initiator_depth;
1660 cm_id_priv->responder_resources = param->responder_resources;
1661 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1662 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1663
1664 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1665 return ret;
1666 }
1667 EXPORT_SYMBOL(ib_send_cm_rep);
1668
1669 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1670 struct cm_id_private *cm_id_priv,
1671 const void *private_data,
1672 u8 private_data_len)
1673 {
1674 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1675 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1676 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1677
1678 if (private_data && private_data_len)
1679 memcpy(rtu_msg->private_data, private_data, private_data_len);
1680 }
1681
1682 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1683 const void *private_data,
1684 u8 private_data_len)
1685 {
1686 struct cm_id_private *cm_id_priv;
1687 struct ib_mad_send_buf *msg;
1688 unsigned long flags;
1689 void *data;
1690 int ret;
1691
1692 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1693 return -EINVAL;
1694
1695 data = cm_copy_private_data(private_data, private_data_len);
1696 if (IS_ERR(data))
1697 return PTR_ERR(data);
1698
1699 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1700 spin_lock_irqsave(&cm_id_priv->lock, flags);
1701 if (cm_id->state != IB_CM_REP_RCVD &&
1702 cm_id->state != IB_CM_MRA_REP_SENT) {
1703 ret = -EINVAL;
1704 goto error;
1705 }
1706
1707 ret = cm_alloc_msg(cm_id_priv, &msg);
1708 if (ret)
1709 goto error;
1710
1711 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1712 private_data, private_data_len);
1713
1714 ret = ib_post_send_mad(msg, NULL);
1715 if (ret) {
1716 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1717 cm_free_msg(msg);
1718 kfree(data);
1719 return ret;
1720 }
1721
1722 cm_id->state = IB_CM_ESTABLISHED;
1723 cm_set_private_data(cm_id_priv, data, private_data_len);
1724 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1725 return 0;
1726
1727 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1728 kfree(data);
1729 return ret;
1730 }
1731 EXPORT_SYMBOL(ib_send_cm_rtu);
1732
1733 static void cm_format_rep_event(struct cm_work *work)
1734 {
1735 struct cm_rep_msg *rep_msg;
1736 struct ib_cm_rep_event_param *param;
1737
1738 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1739 param = &work->cm_event.param.rep_rcvd;
1740 param->remote_ca_guid = rep_msg->local_ca_guid;
1741 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1742 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1743 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1744 param->responder_resources = rep_msg->initiator_depth;
1745 param->initiator_depth = rep_msg->resp_resources;
1746 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1747 param->failover_accepted = cm_rep_get_failover(rep_msg);
1748 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1749 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1750 param->srq = cm_rep_get_srq(rep_msg);
1751 work->cm_event.private_data = &rep_msg->private_data;
1752 }
1753
1754 static void cm_dup_rep_handler(struct cm_work *work)
1755 {
1756 struct cm_id_private *cm_id_priv;
1757 struct cm_rep_msg *rep_msg;
1758 struct ib_mad_send_buf *msg = NULL;
1759 int ret;
1760
1761 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1762 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1763 rep_msg->local_comm_id);
1764 if (!cm_id_priv)
1765 return;
1766
1767 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1768 counter[CM_REP_COUNTER]);
1769 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1770 if (ret)
1771 goto deref;
1772
1773 spin_lock_irq(&cm_id_priv->lock);
1774 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1775 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1776 cm_id_priv->private_data,
1777 cm_id_priv->private_data_len);
1778 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1779 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1780 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1781 cm_id_priv->private_data,
1782 cm_id_priv->private_data_len);
1783 else
1784 goto unlock;
1785 spin_unlock_irq(&cm_id_priv->lock);
1786
1787 ret = ib_post_send_mad(msg, NULL);
1788 if (ret)
1789 goto free;
1790 goto deref;
1791
1792 unlock: spin_unlock_irq(&cm_id_priv->lock);
1793 free: cm_free_msg(msg);
1794 deref: cm_deref_id(cm_id_priv);
1795 }
1796
1797 static int cm_rep_handler(struct cm_work *work)
1798 {
1799 struct cm_id_private *cm_id_priv;
1800 struct cm_rep_msg *rep_msg;
1801 int ret;
1802
1803 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1804 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1805 if (!cm_id_priv) {
1806 cm_dup_rep_handler(work);
1807 return -EINVAL;
1808 }
1809
1810 cm_format_rep_event(work);
1811
1812 spin_lock_irq(&cm_id_priv->lock);
1813 switch (cm_id_priv->id.state) {
1814 case IB_CM_REQ_SENT:
1815 case IB_CM_MRA_REQ_RCVD:
1816 break;
1817 default:
1818 spin_unlock_irq(&cm_id_priv->lock);
1819 ret = -EINVAL;
1820 goto error;
1821 }
1822
1823 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1824 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1825 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1826
1827 spin_lock(&cm.lock);
1828 /* Check for duplicate REP. */
1829 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1830 spin_unlock(&cm.lock);
1831 spin_unlock_irq(&cm_id_priv->lock);
1832 ret = -EINVAL;
1833 goto error;
1834 }
1835 /* Check for a stale connection. */
1836 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1837 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1838 &cm.remote_id_table);
1839 cm_id_priv->timewait_info->inserted_remote_id = 0;
1840 spin_unlock(&cm.lock);
1841 spin_unlock_irq(&cm_id_priv->lock);
1842 cm_issue_rej(work->port, work->mad_recv_wc,
1843 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1844 NULL, 0);
1845 ret = -EINVAL;
1846 goto error;
1847 }
1848 spin_unlock(&cm.lock);
1849
1850 cm_id_priv->id.state = IB_CM_REP_RCVD;
1851 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1852 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1853 cm_id_priv->initiator_depth = rep_msg->resp_resources;
1854 cm_id_priv->responder_resources = rep_msg->initiator_depth;
1855 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1856 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1857 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1858 cm_id_priv->av.timeout =
1859 cm_ack_timeout(cm_id_priv->target_ack_delay,
1860 cm_id_priv->av.timeout - 1);
1861 cm_id_priv->alt_av.timeout =
1862 cm_ack_timeout(cm_id_priv->target_ack_delay,
1863 cm_id_priv->alt_av.timeout - 1);
1864
1865 /* todo: handle peer_to_peer */
1866
1867 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1868 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1869 if (!ret)
1870 list_add_tail(&work->list, &cm_id_priv->work_list);
1871 spin_unlock_irq(&cm_id_priv->lock);
1872
1873 if (ret)
1874 cm_process_work(cm_id_priv, work);
1875 else
1876 cm_deref_id(cm_id_priv);
1877 return 0;
1878
1879 error:
1880 cm_deref_id(cm_id_priv);
1881 return ret;
1882 }
1883
1884 static int cm_establish_handler(struct cm_work *work)
1885 {
1886 struct cm_id_private *cm_id_priv;
1887 int ret;
1888
1889 /* See comment in cm_establish about lookup. */
1890 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1891 if (!cm_id_priv)
1892 return -EINVAL;
1893
1894 spin_lock_irq(&cm_id_priv->lock);
1895 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1896 spin_unlock_irq(&cm_id_priv->lock);
1897 goto out;
1898 }
1899
1900 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1901 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1902 if (!ret)
1903 list_add_tail(&work->list, &cm_id_priv->work_list);
1904 spin_unlock_irq(&cm_id_priv->lock);
1905
1906 if (ret)
1907 cm_process_work(cm_id_priv, work);
1908 else
1909 cm_deref_id(cm_id_priv);
1910 return 0;
1911 out:
1912 cm_deref_id(cm_id_priv);
1913 return -EINVAL;
1914 }
1915
1916 static int cm_rtu_handler(struct cm_work *work)
1917 {
1918 struct cm_id_private *cm_id_priv;
1919 struct cm_rtu_msg *rtu_msg;
1920 int ret;
1921
1922 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1923 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1924 rtu_msg->local_comm_id);
1925 if (!cm_id_priv)
1926 return -EINVAL;
1927
1928 work->cm_event.private_data = &rtu_msg->private_data;
1929
1930 spin_lock_irq(&cm_id_priv->lock);
1931 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1932 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1933 spin_unlock_irq(&cm_id_priv->lock);
1934 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1935 counter[CM_RTU_COUNTER]);
1936 goto out;
1937 }
1938 cm_id_priv->id.state = IB_CM_ESTABLISHED;
1939
1940 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1941 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1942 if (!ret)
1943 list_add_tail(&work->list, &cm_id_priv->work_list);
1944 spin_unlock_irq(&cm_id_priv->lock);
1945
1946 if (ret)
1947 cm_process_work(cm_id_priv, work);
1948 else
1949 cm_deref_id(cm_id_priv);
1950 return 0;
1951 out:
1952 cm_deref_id(cm_id_priv);
1953 return -EINVAL;
1954 }
1955
1956 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1957 struct cm_id_private *cm_id_priv,
1958 const void *private_data,
1959 u8 private_data_len)
1960 {
1961 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1962 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1963 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1964 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1965 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1966
1967 if (private_data && private_data_len)
1968 memcpy(dreq_msg->private_data, private_data, private_data_len);
1969 }
1970
1971 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1972 const void *private_data,
1973 u8 private_data_len)
1974 {
1975 struct cm_id_private *cm_id_priv;
1976 struct ib_mad_send_buf *msg;
1977 unsigned long flags;
1978 int ret;
1979
1980 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1981 return -EINVAL;
1982
1983 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1984 spin_lock_irqsave(&cm_id_priv->lock, flags);
1985 if (cm_id->state != IB_CM_ESTABLISHED) {
1986 ret = -EINVAL;
1987 goto out;
1988 }
1989
1990 ret = cm_alloc_msg(cm_id_priv, &msg);
1991 if (ret) {
1992 cm_enter_timewait(cm_id_priv);
1993 goto out;
1994 }
1995
1996 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1997 private_data, private_data_len);
1998 msg->timeout_ms = cm_id_priv->timeout_ms;
1999 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2000
2001 ret = ib_post_send_mad(msg, NULL);
2002 if (ret) {
2003 cm_enter_timewait(cm_id_priv);
2004 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2005 cm_free_msg(msg);
2006 return ret;
2007 }
2008
2009 cm_id->state = IB_CM_DREQ_SENT;
2010 cm_id_priv->msg = msg;
2011 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2012 return ret;
2013 }
2014 EXPORT_SYMBOL(ib_send_cm_dreq);
2015
2016 static void cm_format_drep(struct cm_drep_msg *drep_msg,
2017 struct cm_id_private *cm_id_priv,
2018 const void *private_data,
2019 u8 private_data_len)
2020 {
2021 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2022 drep_msg->local_comm_id = cm_id_priv->id.local_id;
2023 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
2024
2025 if (private_data && private_data_len)
2026 memcpy(drep_msg->private_data, private_data, private_data_len);
2027 }
2028
2029 int ib_send_cm_drep(struct ib_cm_id *cm_id,
2030 const void *private_data,
2031 u8 private_data_len)
2032 {
2033 struct cm_id_private *cm_id_priv;
2034 struct ib_mad_send_buf *msg;
2035 unsigned long flags;
2036 void *data;
2037 int ret;
2038
2039 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2040 return -EINVAL;
2041
2042 data = cm_copy_private_data(private_data, private_data_len);
2043 if (IS_ERR(data))
2044 return PTR_ERR(data);
2045
2046 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2047 spin_lock_irqsave(&cm_id_priv->lock, flags);
2048 if (cm_id->state != IB_CM_DREQ_RCVD) {
2049 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2050 kfree(data);
2051 return -EINVAL;
2052 }
2053
2054 cm_set_private_data(cm_id_priv, data, private_data_len);
2055 cm_enter_timewait(cm_id_priv);
2056
2057 ret = cm_alloc_msg(cm_id_priv, &msg);
2058 if (ret)
2059 goto out;
2060
2061 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2062 private_data, private_data_len);
2063
2064 ret = ib_post_send_mad(msg, NULL);
2065 if (ret) {
2066 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2067 cm_free_msg(msg);
2068 return ret;
2069 }
2070
2071 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2072 return ret;
2073 }
2074 EXPORT_SYMBOL(ib_send_cm_drep);
2075
2076 static int cm_issue_drep(struct cm_port *port,
2077 struct ib_mad_recv_wc *mad_recv_wc)
2078 {
2079 struct ib_mad_send_buf *msg = NULL;
2080 struct cm_dreq_msg *dreq_msg;
2081 struct cm_drep_msg *drep_msg;
2082 int ret;
2083
2084 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2085 if (ret)
2086 return ret;
2087
2088 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2089 drep_msg = (struct cm_drep_msg *) msg->mad;
2090
2091 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2092 drep_msg->remote_comm_id = dreq_msg->local_comm_id;
2093 drep_msg->local_comm_id = dreq_msg->remote_comm_id;
2094
2095 ret = ib_post_send_mad(msg, NULL);
2096 if (ret)
2097 cm_free_msg(msg);
2098
2099 return ret;
2100 }
2101
2102 static int cm_dreq_handler(struct cm_work *work)
2103 {
2104 struct cm_id_private *cm_id_priv;
2105 struct cm_dreq_msg *dreq_msg;
2106 struct ib_mad_send_buf *msg = NULL;
2107 int ret;
2108
2109 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2110 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
2111 dreq_msg->local_comm_id);
2112 if (!cm_id_priv) {
2113 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2114 counter[CM_DREQ_COUNTER]);
2115 cm_issue_drep(work->port, work->mad_recv_wc);
2116 return -EINVAL;
2117 }
2118
2119 work->cm_event.private_data = &dreq_msg->private_data;
2120
2121 spin_lock_irq(&cm_id_priv->lock);
2122 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
2123 goto unlock;
2124
2125 switch (cm_id_priv->id.state) {
2126 case IB_CM_REP_SENT:
2127 case IB_CM_DREQ_SENT:
2128 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2129 break;
2130 case IB_CM_ESTABLISHED:
2131 case IB_CM_MRA_REP_RCVD:
2132 break;
2133 case IB_CM_TIMEWAIT:
2134 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2135 counter[CM_DREQ_COUNTER]);
2136 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2137 goto unlock;
2138
2139 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2140 cm_id_priv->private_data,
2141 cm_id_priv->private_data_len);
2142 spin_unlock_irq(&cm_id_priv->lock);
2143
2144 if (ib_post_send_mad(msg, NULL))
2145 cm_free_msg(msg);
2146 goto deref;
2147 case IB_CM_DREQ_RCVD:
2148 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2149 counter[CM_DREQ_COUNTER]);
2150 goto unlock;
2151 default:
2152 goto unlock;
2153 }
2154 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2155 cm_id_priv->tid = dreq_msg->hdr.tid;
2156 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2157 if (!ret)
2158 list_add_tail(&work->list, &cm_id_priv->work_list);
2159 spin_unlock_irq(&cm_id_priv->lock);
2160
2161 if (ret)
2162 cm_process_work(cm_id_priv, work);
2163 else
2164 cm_deref_id(cm_id_priv);
2165 return 0;
2166
2167 unlock: spin_unlock_irq(&cm_id_priv->lock);
2168 deref: cm_deref_id(cm_id_priv);
2169 return -EINVAL;
2170 }
2171
2172 static int cm_drep_handler(struct cm_work *work)
2173 {
2174 struct cm_id_private *cm_id_priv;
2175 struct cm_drep_msg *drep_msg;
2176 int ret;
2177
2178 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2179 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2180 drep_msg->local_comm_id);
2181 if (!cm_id_priv)
2182 return -EINVAL;
2183
2184 work->cm_event.private_data = &drep_msg->private_data;
2185
2186 spin_lock_irq(&cm_id_priv->lock);
2187 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2188 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2189 spin_unlock_irq(&cm_id_priv->lock);
2190 goto out;
2191 }
2192 cm_enter_timewait(cm_id_priv);
2193
2194 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2195 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2196 if (!ret)
2197 list_add_tail(&work->list, &cm_id_priv->work_list);
2198 spin_unlock_irq(&cm_id_priv->lock);
2199
2200 if (ret)
2201 cm_process_work(cm_id_priv, work);
2202 else
2203 cm_deref_id(cm_id_priv);
2204 return 0;
2205 out:
2206 cm_deref_id(cm_id_priv);
2207 return -EINVAL;
2208 }
2209
2210 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2211 enum ib_cm_rej_reason reason,
2212 void *ari,
2213 u8 ari_length,
2214 const void *private_data,
2215 u8 private_data_len)
2216 {
2217 struct cm_id_private *cm_id_priv;
2218 struct ib_mad_send_buf *msg;
2219 unsigned long flags;
2220 int ret;
2221
2222 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2223 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2224 return -EINVAL;
2225
2226 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2227
2228 spin_lock_irqsave(&cm_id_priv->lock, flags);
2229 switch (cm_id->state) {
2230 case IB_CM_REQ_SENT:
2231 case IB_CM_MRA_REQ_RCVD:
2232 case IB_CM_REQ_RCVD:
2233 case IB_CM_MRA_REQ_SENT:
2234 case IB_CM_REP_RCVD:
2235 case IB_CM_MRA_REP_SENT:
2236 ret = cm_alloc_msg(cm_id_priv, &msg);
2237 if (!ret)
2238 cm_format_rej((struct cm_rej_msg *) msg->mad,
2239 cm_id_priv, reason, ari, ari_length,
2240 private_data, private_data_len);
2241
2242 cm_reset_to_idle(cm_id_priv);
2243 break;
2244 case IB_CM_REP_SENT:
2245 case IB_CM_MRA_REP_RCVD:
2246 ret = cm_alloc_msg(cm_id_priv, &msg);
2247 if (!ret)
2248 cm_format_rej((struct cm_rej_msg *) msg->mad,
2249 cm_id_priv, reason, ari, ari_length,
2250 private_data, private_data_len);
2251
2252 cm_enter_timewait(cm_id_priv);
2253 break;
2254 default:
2255 ret = -EINVAL;
2256 goto out;
2257 }
2258
2259 if (ret)
2260 goto out;
2261
2262 ret = ib_post_send_mad(msg, NULL);
2263 if (ret)
2264 cm_free_msg(msg);
2265
2266 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2267 return ret;
2268 }
2269 EXPORT_SYMBOL(ib_send_cm_rej);
2270
2271 static void cm_format_rej_event(struct cm_work *work)
2272 {
2273 struct cm_rej_msg *rej_msg;
2274 struct ib_cm_rej_event_param *param;
2275
2276 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2277 param = &work->cm_event.param.rej_rcvd;
2278 param->ari = rej_msg->ari;
2279 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2280 param->reason = __be16_to_cpu(rej_msg->reason);
2281 work->cm_event.private_data = &rej_msg->private_data;
2282 }
2283
2284 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2285 {
2286 struct cm_timewait_info *timewait_info;
2287 struct cm_id_private *cm_id_priv;
2288 __be32 remote_id;
2289
2290 remote_id = rej_msg->local_comm_id;
2291
2292 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2293 spin_lock_irq(&cm.lock);
2294 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2295 remote_id);
2296 if (!timewait_info) {
2297 spin_unlock_irq(&cm.lock);
2298 return NULL;
2299 }
2300 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2301 (timewait_info->work.local_id ^
2302 cm.random_id_operand));
2303 if (cm_id_priv) {
2304 if (cm_id_priv->id.remote_id == remote_id)
2305 atomic_inc(&cm_id_priv->refcount);
2306 else
2307 cm_id_priv = NULL;
2308 }
2309 spin_unlock_irq(&cm.lock);
2310 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2311 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2312 else
2313 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2314
2315 return cm_id_priv;
2316 }
2317
2318 static int cm_rej_handler(struct cm_work *work)
2319 {
2320 struct cm_id_private *cm_id_priv;
2321 struct cm_rej_msg *rej_msg;
2322 int ret;
2323
2324 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2325 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2326 if (!cm_id_priv)
2327 return -EINVAL;
2328
2329 cm_format_rej_event(work);
2330
2331 spin_lock_irq(&cm_id_priv->lock);
2332 switch (cm_id_priv->id.state) {
2333 case IB_CM_REQ_SENT:
2334 case IB_CM_MRA_REQ_RCVD:
2335 case IB_CM_REP_SENT:
2336 case IB_CM_MRA_REP_RCVD:
2337 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2338 /* fall through */
2339 case IB_CM_REQ_RCVD:
2340 case IB_CM_MRA_REQ_SENT:
2341 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2342 cm_enter_timewait(cm_id_priv);
2343 else
2344 cm_reset_to_idle(cm_id_priv);
2345 break;
2346 case IB_CM_DREQ_SENT:
2347 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2348 /* fall through */
2349 case IB_CM_REP_RCVD:
2350 case IB_CM_MRA_REP_SENT:
2351 case IB_CM_ESTABLISHED:
2352 cm_enter_timewait(cm_id_priv);
2353 break;
2354 default:
2355 spin_unlock_irq(&cm_id_priv->lock);
2356 ret = -EINVAL;
2357 goto out;
2358 }
2359
2360 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2361 if (!ret)
2362 list_add_tail(&work->list, &cm_id_priv->work_list);
2363 spin_unlock_irq(&cm_id_priv->lock);
2364
2365 if (ret)
2366 cm_process_work(cm_id_priv, work);
2367 else
2368 cm_deref_id(cm_id_priv);
2369 return 0;
2370 out:
2371 cm_deref_id(cm_id_priv);
2372 return -EINVAL;
2373 }
2374
2375 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2376 u8 service_timeout,
2377 const void *private_data,
2378 u8 private_data_len)
2379 {
2380 struct cm_id_private *cm_id_priv;
2381 struct ib_mad_send_buf *msg;
2382 enum ib_cm_state cm_state;
2383 enum ib_cm_lap_state lap_state;
2384 enum cm_msg_response msg_response;
2385 void *data;
2386 unsigned long flags;
2387 int ret;
2388
2389 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2390 return -EINVAL;
2391
2392 data = cm_copy_private_data(private_data, private_data_len);
2393 if (IS_ERR(data))
2394 return PTR_ERR(data);
2395
2396 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2397
2398 spin_lock_irqsave(&cm_id_priv->lock, flags);
2399 switch(cm_id_priv->id.state) {
2400 case IB_CM_REQ_RCVD:
2401 cm_state = IB_CM_MRA_REQ_SENT;
2402 lap_state = cm_id->lap_state;
2403 msg_response = CM_MSG_RESPONSE_REQ;
2404 break;
2405 case IB_CM_REP_RCVD:
2406 cm_state = IB_CM_MRA_REP_SENT;
2407 lap_state = cm_id->lap_state;
2408 msg_response = CM_MSG_RESPONSE_REP;
2409 break;
2410 case IB_CM_ESTABLISHED:
2411 cm_state = cm_id->state;
2412 lap_state = IB_CM_MRA_LAP_SENT;
2413 msg_response = CM_MSG_RESPONSE_OTHER;
2414 break;
2415 default:
2416 ret = -EINVAL;
2417 goto error1;
2418 }
2419
2420 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
2421 ret = cm_alloc_msg(cm_id_priv, &msg);
2422 if (ret)
2423 goto error1;
2424
2425 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2426 msg_response, service_timeout,
2427 private_data, private_data_len);
2428 ret = ib_post_send_mad(msg, NULL);
2429 if (ret)
2430 goto error2;
2431 }
2432
2433 cm_id->state = cm_state;
2434 cm_id->lap_state = lap_state;
2435 cm_id_priv->service_timeout = service_timeout;
2436 cm_set_private_data(cm_id_priv, data, private_data_len);
2437 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2438 return 0;
2439
2440 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2441 kfree(data);
2442 return ret;
2443
2444 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2445 kfree(data);
2446 cm_free_msg(msg);
2447 return ret;
2448 }
2449 EXPORT_SYMBOL(ib_send_cm_mra);
2450
2451 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2452 {
2453 switch (cm_mra_get_msg_mraed(mra_msg)) {
2454 case CM_MSG_RESPONSE_REQ:
2455 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2456 case CM_MSG_RESPONSE_REP:
2457 case CM_MSG_RESPONSE_OTHER:
2458 return cm_acquire_id(mra_msg->remote_comm_id,
2459 mra_msg->local_comm_id);
2460 default:
2461 return NULL;
2462 }
2463 }
2464
2465 static int cm_mra_handler(struct cm_work *work)
2466 {
2467 struct cm_id_private *cm_id_priv;
2468 struct cm_mra_msg *mra_msg;
2469 int timeout, ret;
2470
2471 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2472 cm_id_priv = cm_acquire_mraed_id(mra_msg);
2473 if (!cm_id_priv)
2474 return -EINVAL;
2475
2476 work->cm_event.private_data = &mra_msg->private_data;
2477 work->cm_event.param.mra_rcvd.service_timeout =
2478 cm_mra_get_service_timeout(mra_msg);
2479 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2480 cm_convert_to_ms(cm_id_priv->av.timeout);
2481
2482 spin_lock_irq(&cm_id_priv->lock);
2483 switch (cm_id_priv->id.state) {
2484 case IB_CM_REQ_SENT:
2485 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2486 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2487 cm_id_priv->msg, timeout))
2488 goto out;
2489 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2490 break;
2491 case IB_CM_REP_SENT:
2492 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2493 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2494 cm_id_priv->msg, timeout))
2495 goto out;
2496 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2497 break;
2498 case IB_CM_ESTABLISHED:
2499 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2500 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2501 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2502 cm_id_priv->msg, timeout)) {
2503 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2504 atomic_long_inc(&work->port->
2505 counter_group[CM_RECV_DUPLICATES].
2506 counter[CM_MRA_COUNTER]);
2507 goto out;
2508 }
2509 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2510 break;
2511 case IB_CM_MRA_REQ_RCVD:
2512 case IB_CM_MRA_REP_RCVD:
2513 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2514 counter[CM_MRA_COUNTER]);
2515 /* fall through */
2516 default:
2517 goto out;
2518 }
2519
2520 cm_id_priv->msg->context[1] = (void *) (unsigned long)
2521 cm_id_priv->id.state;
2522 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2523 if (!ret)
2524 list_add_tail(&work->list, &cm_id_priv->work_list);
2525 spin_unlock_irq(&cm_id_priv->lock);
2526
2527 if (ret)
2528 cm_process_work(cm_id_priv, work);
2529 else
2530 cm_deref_id(cm_id_priv);
2531 return 0;
2532 out:
2533 spin_unlock_irq(&cm_id_priv->lock);
2534 cm_deref_id(cm_id_priv);
2535 return -EINVAL;
2536 }
2537
2538 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2539 struct cm_id_private *cm_id_priv,
2540 struct ib_sa_path_rec *alternate_path,
2541 const void *private_data,
2542 u8 private_data_len)
2543 {
2544 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2545 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2546 lap_msg->local_comm_id = cm_id_priv->id.local_id;
2547 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2548 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2549 /* todo: need remote CM response timeout */
2550 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2551 lap_msg->alt_local_lid = alternate_path->slid;
2552 lap_msg->alt_remote_lid = alternate_path->dlid;
2553 lap_msg->alt_local_gid = alternate_path->sgid;
2554 lap_msg->alt_remote_gid = alternate_path->dgid;
2555 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2556 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2557 lap_msg->alt_hop_limit = alternate_path->hop_limit;
2558 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2559 cm_lap_set_sl(lap_msg, alternate_path->sl);
2560 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2561 cm_lap_set_local_ack_timeout(lap_msg,
2562 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
2563 alternate_path->packet_life_time));
2564
2565 if (private_data && private_data_len)
2566 memcpy(lap_msg->private_data, private_data, private_data_len);
2567 }
2568
2569 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2570 struct ib_sa_path_rec *alternate_path,
2571 const void *private_data,
2572 u8 private_data_len)
2573 {
2574 struct cm_id_private *cm_id_priv;
2575 struct ib_mad_send_buf *msg;
2576 unsigned long flags;
2577 int ret;
2578
2579 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2580 return -EINVAL;
2581
2582 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2583 spin_lock_irqsave(&cm_id_priv->lock, flags);
2584 if (cm_id->state != IB_CM_ESTABLISHED ||
2585 (cm_id->lap_state != IB_CM_LAP_UNINIT &&
2586 cm_id->lap_state != IB_CM_LAP_IDLE)) {
2587 ret = -EINVAL;
2588 goto out;
2589 }
2590
2591 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av);
2592 if (ret)
2593 goto out;
2594 cm_id_priv->alt_av.timeout =
2595 cm_ack_timeout(cm_id_priv->target_ack_delay,
2596 cm_id_priv->alt_av.timeout - 1);
2597
2598 ret = cm_alloc_msg(cm_id_priv, &msg);
2599 if (ret)
2600 goto out;
2601
2602 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2603 alternate_path, private_data, private_data_len);
2604 msg->timeout_ms = cm_id_priv->timeout_ms;
2605 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2606
2607 ret = ib_post_send_mad(msg, NULL);
2608 if (ret) {
2609 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2610 cm_free_msg(msg);
2611 return ret;
2612 }
2613
2614 cm_id->lap_state = IB_CM_LAP_SENT;
2615 cm_id_priv->msg = msg;
2616
2617 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2618 return ret;
2619 }
2620 EXPORT_SYMBOL(ib_send_cm_lap);
2621
2622 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
2623 struct ib_sa_path_rec *path,
2624 struct cm_lap_msg *lap_msg)
2625 {
2626 memset(path, 0, sizeof *path);
2627 path->dgid = lap_msg->alt_local_gid;
2628 path->sgid = lap_msg->alt_remote_gid;
2629 path->dlid = lap_msg->alt_local_lid;
2630 path->slid = lap_msg->alt_remote_lid;
2631 path->flow_label = cm_lap_get_flow_label(lap_msg);
2632 path->hop_limit = lap_msg->alt_hop_limit;
2633 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2634 path->reversible = 1;
2635 path->pkey = cm_id_priv->pkey;
2636 path->sl = cm_lap_get_sl(lap_msg);
2637 path->mtu_selector = IB_SA_EQ;
2638 path->mtu = cm_id_priv->path_mtu;
2639 path->rate_selector = IB_SA_EQ;
2640 path->rate = cm_lap_get_packet_rate(lap_msg);
2641 path->packet_life_time_selector = IB_SA_EQ;
2642 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2643 path->packet_life_time -= (path->packet_life_time > 0);
2644 }
2645
2646 static int cm_lap_handler(struct cm_work *work)
2647 {
2648 struct cm_id_private *cm_id_priv;
2649 struct cm_lap_msg *lap_msg;
2650 struct ib_cm_lap_event_param *param;
2651 struct ib_mad_send_buf *msg = NULL;
2652 int ret;
2653
2654 /* todo: verify LAP request and send reject APR if invalid. */
2655 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2656 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2657 lap_msg->local_comm_id);
2658 if (!cm_id_priv)
2659 return -EINVAL;
2660
2661 param = &work->cm_event.param.lap_rcvd;
2662 param->alternate_path = &work->path[0];
2663 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
2664 work->cm_event.private_data = &lap_msg->private_data;
2665
2666 spin_lock_irq(&cm_id_priv->lock);
2667 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2668 goto unlock;
2669
2670 switch (cm_id_priv->id.lap_state) {
2671 case IB_CM_LAP_UNINIT:
2672 case IB_CM_LAP_IDLE:
2673 break;
2674 case IB_CM_MRA_LAP_SENT:
2675 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2676 counter[CM_LAP_COUNTER]);
2677 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2678 goto unlock;
2679
2680 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2681 CM_MSG_RESPONSE_OTHER,
2682 cm_id_priv->service_timeout,
2683 cm_id_priv->private_data,
2684 cm_id_priv->private_data_len);
2685 spin_unlock_irq(&cm_id_priv->lock);
2686
2687 if (ib_post_send_mad(msg, NULL))
2688 cm_free_msg(msg);
2689 goto deref;
2690 case IB_CM_LAP_RCVD:
2691 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2692 counter[CM_LAP_COUNTER]);
2693 goto unlock;
2694 default:
2695 goto unlock;
2696 }
2697
2698 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2699 cm_id_priv->tid = lap_msg->hdr.tid;
2700 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2701 work->mad_recv_wc->recv_buf.grh,
2702 &cm_id_priv->av);
2703 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av);
2704 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2705 if (!ret)
2706 list_add_tail(&work->list, &cm_id_priv->work_list);
2707 spin_unlock_irq(&cm_id_priv->lock);
2708
2709 if (ret)
2710 cm_process_work(cm_id_priv, work);
2711 else
2712 cm_deref_id(cm_id_priv);
2713 return 0;
2714
2715 unlock: spin_unlock_irq(&cm_id_priv->lock);
2716 deref: cm_deref_id(cm_id_priv);
2717 return -EINVAL;
2718 }
2719
2720 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2721 struct cm_id_private *cm_id_priv,
2722 enum ib_cm_apr_status status,
2723 void *info,
2724 u8 info_length,
2725 const void *private_data,
2726 u8 private_data_len)
2727 {
2728 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2729 apr_msg->local_comm_id = cm_id_priv->id.local_id;
2730 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2731 apr_msg->ap_status = (u8) status;
2732
2733 if (info && info_length) {
2734 apr_msg->info_length = info_length;
2735 memcpy(apr_msg->info, info, info_length);
2736 }
2737
2738 if (private_data && private_data_len)
2739 memcpy(apr_msg->private_data, private_data, private_data_len);
2740 }
2741
2742 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2743 enum ib_cm_apr_status status,
2744 void *info,
2745 u8 info_length,
2746 const void *private_data,
2747 u8 private_data_len)
2748 {
2749 struct cm_id_private *cm_id_priv;
2750 struct ib_mad_send_buf *msg;
2751 unsigned long flags;
2752 int ret;
2753
2754 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2755 (info && info_length > IB_CM_APR_INFO_LENGTH))
2756 return -EINVAL;
2757
2758 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2759 spin_lock_irqsave(&cm_id_priv->lock, flags);
2760 if (cm_id->state != IB_CM_ESTABLISHED ||
2761 (cm_id->lap_state != IB_CM_LAP_RCVD &&
2762 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2763 ret = -EINVAL;
2764 goto out;
2765 }
2766
2767 ret = cm_alloc_msg(cm_id_priv, &msg);
2768 if (ret)
2769 goto out;
2770
2771 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2772 info, info_length, private_data, private_data_len);
2773 ret = ib_post_send_mad(msg, NULL);
2774 if (ret) {
2775 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2776 cm_free_msg(msg);
2777 return ret;
2778 }
2779
2780 cm_id->lap_state = IB_CM_LAP_IDLE;
2781 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2782 return ret;
2783 }
2784 EXPORT_SYMBOL(ib_send_cm_apr);
2785
2786 static int cm_apr_handler(struct cm_work *work)
2787 {
2788 struct cm_id_private *cm_id_priv;
2789 struct cm_apr_msg *apr_msg;
2790 int ret;
2791
2792 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2793 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2794 apr_msg->local_comm_id);
2795 if (!cm_id_priv)
2796 return -EINVAL; /* Unmatched reply. */
2797
2798 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2799 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2800 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2801 work->cm_event.private_data = &apr_msg->private_data;
2802
2803 spin_lock_irq(&cm_id_priv->lock);
2804 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2805 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2806 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2807 spin_unlock_irq(&cm_id_priv->lock);
2808 goto out;
2809 }
2810 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2811 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2812 cm_id_priv->msg = NULL;
2813
2814 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2815 if (!ret)
2816 list_add_tail(&work->list, &cm_id_priv->work_list);
2817 spin_unlock_irq(&cm_id_priv->lock);
2818
2819 if (ret)
2820 cm_process_work(cm_id_priv, work);
2821 else
2822 cm_deref_id(cm_id_priv);
2823 return 0;
2824 out:
2825 cm_deref_id(cm_id_priv);
2826 return -EINVAL;
2827 }
2828
2829 static int cm_timewait_handler(struct cm_work *work)
2830 {
2831 struct cm_timewait_info *timewait_info;
2832 struct cm_id_private *cm_id_priv;
2833 int ret;
2834
2835 timewait_info = (struct cm_timewait_info *)work;
2836 spin_lock_irq(&cm.lock);
2837 list_del(&timewait_info->list);
2838 spin_unlock_irq(&cm.lock);
2839
2840 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2841 timewait_info->work.remote_id);
2842 if (!cm_id_priv)
2843 return -EINVAL;
2844
2845 spin_lock_irq(&cm_id_priv->lock);
2846 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2847 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2848 spin_unlock_irq(&cm_id_priv->lock);
2849 goto out;
2850 }
2851 cm_id_priv->id.state = IB_CM_IDLE;
2852 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2853 if (!ret)
2854 list_add_tail(&work->list, &cm_id_priv->work_list);
2855 spin_unlock_irq(&cm_id_priv->lock);
2856
2857 if (ret)
2858 cm_process_work(cm_id_priv, work);
2859 else
2860 cm_deref_id(cm_id_priv);
2861 return 0;
2862 out:
2863 cm_deref_id(cm_id_priv);
2864 return -EINVAL;
2865 }
2866
2867 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2868 struct cm_id_private *cm_id_priv,
2869 struct ib_cm_sidr_req_param *param)
2870 {
2871 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2872 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2873 sidr_req_msg->request_id = cm_id_priv->id.local_id;
2874 sidr_req_msg->pkey = param->path->pkey;
2875 sidr_req_msg->service_id = param->service_id;
2876
2877 if (param->private_data && param->private_data_len)
2878 memcpy(sidr_req_msg->private_data, param->private_data,
2879 param->private_data_len);
2880 }
2881
2882 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2883 struct ib_cm_sidr_req_param *param)
2884 {
2885 struct cm_id_private *cm_id_priv;
2886 struct ib_mad_send_buf *msg;
2887 unsigned long flags;
2888 int ret;
2889
2890 if (!param->path || (param->private_data &&
2891 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2892 return -EINVAL;
2893
2894 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2895 ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2896 if (ret)
2897 goto out;
2898
2899 cm_id->service_id = param->service_id;
2900 cm_id->service_mask = ~cpu_to_be64(0);
2901 cm_id_priv->timeout_ms = param->timeout_ms;
2902 cm_id_priv->max_cm_retries = param->max_cm_retries;
2903 ret = cm_alloc_msg(cm_id_priv, &msg);
2904 if (ret)
2905 goto out;
2906
2907 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2908 param);
2909 msg->timeout_ms = cm_id_priv->timeout_ms;
2910 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2911
2912 spin_lock_irqsave(&cm_id_priv->lock, flags);
2913 if (cm_id->state == IB_CM_IDLE)
2914 ret = ib_post_send_mad(msg, NULL);
2915 else
2916 ret = -EINVAL;
2917
2918 if (ret) {
2919 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2920 cm_free_msg(msg);
2921 goto out;
2922 }
2923 cm_id->state = IB_CM_SIDR_REQ_SENT;
2924 cm_id_priv->msg = msg;
2925 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2926 out:
2927 return ret;
2928 }
2929 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2930
2931 static void cm_format_sidr_req_event(struct cm_work *work,
2932 struct ib_cm_id *listen_id)
2933 {
2934 struct cm_sidr_req_msg *sidr_req_msg;
2935 struct ib_cm_sidr_req_event_param *param;
2936
2937 sidr_req_msg = (struct cm_sidr_req_msg *)
2938 work->mad_recv_wc->recv_buf.mad;
2939 param = &work->cm_event.param.sidr_req_rcvd;
2940 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2941 param->listen_id = listen_id;
2942 param->port = work->port->port_num;
2943 work->cm_event.private_data = &sidr_req_msg->private_data;
2944 }
2945
2946 static int cm_sidr_req_handler(struct cm_work *work)
2947 {
2948 struct ib_cm_id *cm_id;
2949 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2950 struct cm_sidr_req_msg *sidr_req_msg;
2951 struct ib_wc *wc;
2952
2953 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
2954 if (IS_ERR(cm_id))
2955 return PTR_ERR(cm_id);
2956 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2957
2958 /* Record SGID/SLID and request ID for lookup. */
2959 sidr_req_msg = (struct cm_sidr_req_msg *)
2960 work->mad_recv_wc->recv_buf.mad;
2961 wc = work->mad_recv_wc->wc;
2962 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2963 cm_id_priv->av.dgid.global.interface_id = 0;
2964 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2965 work->mad_recv_wc->recv_buf.grh,
2966 &cm_id_priv->av);
2967 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2968 cm_id_priv->tid = sidr_req_msg->hdr.tid;
2969 atomic_inc(&cm_id_priv->work_count);
2970
2971 spin_lock_irq(&cm.lock);
2972 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2973 if (cur_cm_id_priv) {
2974 spin_unlock_irq(&cm.lock);
2975 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2976 counter[CM_SIDR_REQ_COUNTER]);
2977 goto out; /* Duplicate message. */
2978 }
2979 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
2980 cur_cm_id_priv = cm_find_listen(cm_id->device,
2981 sidr_req_msg->service_id,
2982 sidr_req_msg->private_data);
2983 if (!cur_cm_id_priv) {
2984 spin_unlock_irq(&cm.lock);
2985 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED);
2986 goto out; /* No match. */
2987 }
2988 atomic_inc(&cur_cm_id_priv->refcount);
2989 spin_unlock_irq(&cm.lock);
2990
2991 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2992 cm_id_priv->id.context = cur_cm_id_priv->id.context;
2993 cm_id_priv->id.service_id = sidr_req_msg->service_id;
2994 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
2995
2996 cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2997 cm_process_work(cm_id_priv, work);
2998 cm_deref_id(cur_cm_id_priv);
2999 return 0;
3000 out:
3001 ib_destroy_cm_id(&cm_id_priv->id);
3002 return -EINVAL;
3003 }
3004
3005 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3006 struct cm_id_private *cm_id_priv,
3007 struct ib_cm_sidr_rep_param *param)
3008 {
3009 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3010 cm_id_priv->tid);
3011 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
3012 sidr_rep_msg->status = param->status;
3013 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
3014 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
3015 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
3016
3017 if (param->info && param->info_length)
3018 memcpy(sidr_rep_msg->info, param->info, param->info_length);
3019
3020 if (param->private_data && param->private_data_len)
3021 memcpy(sidr_rep_msg->private_data, param->private_data,
3022 param->private_data_len);
3023 }
3024
3025 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3026 struct ib_cm_sidr_rep_param *param)
3027 {
3028 struct cm_id_private *cm_id_priv;
3029 struct ib_mad_send_buf *msg;
3030 unsigned long flags;
3031 int ret;
3032
3033 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3034 (param->private_data &&
3035 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3036 return -EINVAL;
3037
3038 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3039 spin_lock_irqsave(&cm_id_priv->lock, flags);
3040 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
3041 ret = -EINVAL;
3042 goto error;
3043 }
3044
3045 ret = cm_alloc_msg(cm_id_priv, &msg);
3046 if (ret)
3047 goto error;
3048
3049 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3050 param);
3051 ret = ib_post_send_mad(msg, NULL);
3052 if (ret) {
3053 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3054 cm_free_msg(msg);
3055 return ret;
3056 }
3057 cm_id->state = IB_CM_IDLE;
3058 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3059
3060 spin_lock_irqsave(&cm.lock, flags);
3061 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3062 spin_unlock_irqrestore(&cm.lock, flags);
3063 return 0;
3064
3065 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3066 return ret;
3067 }
3068 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3069
3070 static void cm_format_sidr_rep_event(struct cm_work *work)
3071 {
3072 struct cm_sidr_rep_msg *sidr_rep_msg;
3073 struct ib_cm_sidr_rep_event_param *param;
3074
3075 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3076 work->mad_recv_wc->recv_buf.mad;
3077 param = &work->cm_event.param.sidr_rep_rcvd;
3078 param->status = sidr_rep_msg->status;
3079 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
3080 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
3081 param->info = &sidr_rep_msg->info;
3082 param->info_len = sidr_rep_msg->info_length;
3083 work->cm_event.private_data = &sidr_rep_msg->private_data;
3084 }
3085
3086 static int cm_sidr_rep_handler(struct cm_work *work)
3087 {
3088 struct cm_sidr_rep_msg *sidr_rep_msg;
3089 struct cm_id_private *cm_id_priv;
3090
3091 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3092 work->mad_recv_wc->recv_buf.mad;
3093 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
3094 if (!cm_id_priv)
3095 return -EINVAL; /* Unmatched reply. */
3096
3097 spin_lock_irq(&cm_id_priv->lock);
3098 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3099 spin_unlock_irq(&cm_id_priv->lock);
3100 goto out;
3101 }
3102 cm_id_priv->id.state = IB_CM_IDLE;
3103 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3104 spin_unlock_irq(&cm_id_priv->lock);
3105
3106 cm_format_sidr_rep_event(work);
3107 cm_process_work(cm_id_priv, work);
3108 return 0;
3109 out:
3110 cm_deref_id(cm_id_priv);
3111 return -EINVAL;
3112 }
3113
3114 static void cm_process_send_error(struct ib_mad_send_buf *msg,
3115 enum ib_wc_status wc_status)
3116 {
3117 struct cm_id_private *cm_id_priv;
3118 struct ib_cm_event cm_event;
3119 enum ib_cm_state state;
3120 int ret;
3121
3122 memset(&cm_event, 0, sizeof cm_event);
3123 cm_id_priv = msg->context[0];
3124
3125 /* Discard old sends or ones without a response. */
3126 spin_lock_irq(&cm_id_priv->lock);
3127 state = (enum ib_cm_state) (unsigned long) msg->context[1];
3128 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3129 goto discard;
3130
3131 switch (state) {
3132 case IB_CM_REQ_SENT:
3133 case IB_CM_MRA_REQ_RCVD:
3134 cm_reset_to_idle(cm_id_priv);
3135 cm_event.event = IB_CM_REQ_ERROR;
3136 break;
3137 case IB_CM_REP_SENT:
3138 case IB_CM_MRA_REP_RCVD:
3139 cm_reset_to_idle(cm_id_priv);
3140 cm_event.event = IB_CM_REP_ERROR;
3141 break;
3142 case IB_CM_DREQ_SENT:
3143 cm_enter_timewait(cm_id_priv);
3144 cm_event.event = IB_CM_DREQ_ERROR;
3145 break;
3146 case IB_CM_SIDR_REQ_SENT:
3147 cm_id_priv->id.state = IB_CM_IDLE;
3148 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3149 break;
3150 default:
3151 goto discard;
3152 }
3153 spin_unlock_irq(&cm_id_priv->lock);
3154 cm_event.param.send_status = wc_status;
3155
3156 /* No other events can occur on the cm_id at this point. */
3157 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3158 cm_free_msg(msg);
3159 if (ret)
3160 ib_destroy_cm_id(&cm_id_priv->id);
3161 return;
3162 discard:
3163 spin_unlock_irq(&cm_id_priv->lock);
3164 cm_free_msg(msg);
3165 }
3166
3167 static void cm_send_handler(struct ib_mad_agent *mad_agent,
3168 struct ib_mad_send_wc *mad_send_wc)
3169 {
3170 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3171 struct cm_port *port;
3172 u16 attr_index;
3173
3174 port = mad_agent->context;
3175 attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3176 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3177
3178 /*
3179 * If the send was in response to a received message (context[0] is not
3180 * set to a cm_id), and is not a REJ, then it is a send that was
3181 * manually retried.
3182 */
3183 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3184 msg->retries = 1;
3185
3186 atomic_long_add(1 + msg->retries,
3187 &port->counter_group[CM_XMIT].counter[attr_index]);
3188 if (msg->retries)
3189 atomic_long_add(msg->retries,
3190 &port->counter_group[CM_XMIT_RETRIES].
3191 counter[attr_index]);
3192
3193 switch (mad_send_wc->status) {
3194 case IB_WC_SUCCESS:
3195 case IB_WC_WR_FLUSH_ERR:
3196 cm_free_msg(msg);
3197 break;
3198 default:
3199 if (msg->context[0] && msg->context[1])
3200 cm_process_send_error(msg, mad_send_wc->status);
3201 else
3202 cm_free_msg(msg);
3203 break;
3204 }
3205 }
3206
3207 static void cm_work_handler(struct work_struct *_work)
3208 {
3209 struct cm_work *work = container_of(_work, struct cm_work, work.work);
3210 int ret;
3211
3212 switch (work->cm_event.event) {
3213 case IB_CM_REQ_RECEIVED:
3214 ret = cm_req_handler(work);
3215 break;
3216 case IB_CM_MRA_RECEIVED:
3217 ret = cm_mra_handler(work);
3218 break;
3219 case IB_CM_REJ_RECEIVED:
3220 ret = cm_rej_handler(work);
3221 break;
3222 case IB_CM_REP_RECEIVED:
3223 ret = cm_rep_handler(work);
3224 break;
3225 case IB_CM_RTU_RECEIVED:
3226 ret = cm_rtu_handler(work);
3227 break;
3228 case IB_CM_USER_ESTABLISHED:
3229 ret = cm_establish_handler(work);
3230 break;
3231 case IB_CM_DREQ_RECEIVED:
3232 ret = cm_dreq_handler(work);
3233 break;
3234 case IB_CM_DREP_RECEIVED:
3235 ret = cm_drep_handler(work);
3236 break;
3237 case IB_CM_SIDR_REQ_RECEIVED:
3238 ret = cm_sidr_req_handler(work);
3239 break;
3240 case IB_CM_SIDR_REP_RECEIVED:
3241 ret = cm_sidr_rep_handler(work);
3242 break;
3243 case IB_CM_LAP_RECEIVED:
3244 ret = cm_lap_handler(work);
3245 break;
3246 case IB_CM_APR_RECEIVED:
3247 ret = cm_apr_handler(work);
3248 break;
3249 case IB_CM_TIMEWAIT_EXIT:
3250 ret = cm_timewait_handler(work);
3251 break;
3252 default:
3253 ret = -EINVAL;
3254 break;
3255 }
3256 if (ret)
3257 cm_free_work(work);
3258 }
3259
3260 static int cm_establish(struct ib_cm_id *cm_id)
3261 {
3262 struct cm_id_private *cm_id_priv;
3263 struct cm_work *work;
3264 unsigned long flags;
3265 int ret = 0;
3266
3267 work = kmalloc(sizeof *work, GFP_ATOMIC);
3268 if (!work)
3269 return -ENOMEM;
3270
3271 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3272 spin_lock_irqsave(&cm_id_priv->lock, flags);
3273 switch (cm_id->state)
3274 {
3275 case IB_CM_REP_SENT:
3276 case IB_CM_MRA_REP_RCVD:
3277 cm_id->state = IB_CM_ESTABLISHED;
3278 break;
3279 case IB_CM_ESTABLISHED:
3280 ret = -EISCONN;
3281 break;
3282 default:
3283 ret = -EINVAL;
3284 break;
3285 }
3286 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3287
3288 if (ret) {
3289 kfree(work);
3290 goto out;
3291 }
3292
3293 /*
3294 * The CM worker thread may try to destroy the cm_id before it
3295 * can execute this work item. To prevent potential deadlock,
3296 * we need to find the cm_id once we're in the context of the
3297 * worker thread, rather than holding a reference on it.
3298 */
3299 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3300 work->local_id = cm_id->local_id;
3301 work->remote_id = cm_id->remote_id;
3302 work->mad_recv_wc = NULL;
3303 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3304 queue_delayed_work(cm.wq, &work->work, 0);
3305 out:
3306 return ret;
3307 }
3308
3309 static int cm_migrate(struct ib_cm_id *cm_id)
3310 {
3311 struct cm_id_private *cm_id_priv;
3312 unsigned long flags;
3313 int ret = 0;
3314
3315 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3316 spin_lock_irqsave(&cm_id_priv->lock, flags);
3317 if (cm_id->state == IB_CM_ESTABLISHED &&
3318 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3319 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3320 cm_id->lap_state = IB_CM_LAP_IDLE;
3321 cm_id_priv->av = cm_id_priv->alt_av;
3322 } else
3323 ret = -EINVAL;
3324 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3325
3326 return ret;
3327 }
3328
3329 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3330 {
3331 int ret;
3332
3333 switch (event) {
3334 case IB_EVENT_COMM_EST:
3335 ret = cm_establish(cm_id);
3336 break;
3337 case IB_EVENT_PATH_MIG:
3338 ret = cm_migrate(cm_id);
3339 break;
3340 default:
3341 ret = -EINVAL;
3342 }
3343 return ret;
3344 }
3345 EXPORT_SYMBOL(ib_cm_notify);
3346
3347 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3348 struct ib_mad_recv_wc *mad_recv_wc)
3349 {
3350 struct cm_port *port = mad_agent->context;
3351 struct cm_work *work;
3352 enum ib_cm_event_type event;
3353 u16 attr_id;
3354 int paths = 0;
3355
3356 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3357 case CM_REQ_ATTR_ID:
3358 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3359 alt_local_lid != 0);
3360 event = IB_CM_REQ_RECEIVED;
3361 break;
3362 case CM_MRA_ATTR_ID:
3363 event = IB_CM_MRA_RECEIVED;
3364 break;
3365 case CM_REJ_ATTR_ID:
3366 event = IB_CM_REJ_RECEIVED;
3367 break;
3368 case CM_REP_ATTR_ID:
3369 event = IB_CM_REP_RECEIVED;
3370 break;
3371 case CM_RTU_ATTR_ID:
3372 event = IB_CM_RTU_RECEIVED;
3373 break;
3374 case CM_DREQ_ATTR_ID:
3375 event = IB_CM_DREQ_RECEIVED;
3376 break;
3377 case CM_DREP_ATTR_ID:
3378 event = IB_CM_DREP_RECEIVED;
3379 break;
3380 case CM_SIDR_REQ_ATTR_ID:
3381 event = IB_CM_SIDR_REQ_RECEIVED;
3382 break;
3383 case CM_SIDR_REP_ATTR_ID:
3384 event = IB_CM_SIDR_REP_RECEIVED;
3385 break;
3386 case CM_LAP_ATTR_ID:
3387 paths = 1;
3388 event = IB_CM_LAP_RECEIVED;
3389 break;
3390 case CM_APR_ATTR_ID:
3391 event = IB_CM_APR_RECEIVED;
3392 break;
3393 default:
3394 ib_free_recv_mad(mad_recv_wc);
3395 return;
3396 }
3397
3398 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
3399 atomic_long_inc(&port->counter_group[CM_RECV].
3400 counter[attr_id - CM_ATTR_ID_OFFSET]);
3401
3402 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3403 GFP_KERNEL);
3404 if (!work) {
3405 ib_free_recv_mad(mad_recv_wc);
3406 return;
3407 }
3408
3409 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3410 work->cm_event.event = event;
3411 work->mad_recv_wc = mad_recv_wc;
3412 work->port = port;
3413 queue_delayed_work(cm.wq, &work->work, 0);
3414 }
3415
3416 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3417 struct ib_qp_attr *qp_attr,
3418 int *qp_attr_mask)
3419 {
3420 unsigned long flags;
3421 int ret;
3422
3423 spin_lock_irqsave(&cm_id_priv->lock, flags);
3424 switch (cm_id_priv->id.state) {
3425 case IB_CM_REQ_SENT:
3426 case IB_CM_MRA_REQ_RCVD:
3427 case IB_CM_REQ_RCVD:
3428 case IB_CM_MRA_REQ_SENT:
3429 case IB_CM_REP_RCVD:
3430 case IB_CM_MRA_REP_SENT:
3431 case IB_CM_REP_SENT:
3432 case IB_CM_MRA_REP_RCVD:
3433 case IB_CM_ESTABLISHED:
3434 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3435 IB_QP_PKEY_INDEX | IB_QP_PORT;
3436 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
3437 if (cm_id_priv->responder_resources)
3438 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3439 IB_ACCESS_REMOTE_ATOMIC;
3440 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3441 qp_attr->port_num = cm_id_priv->av.port->port_num;
3442 ret = 0;
3443 break;
3444 default:
3445 ret = -EINVAL;
3446 break;
3447 }
3448 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3449 return ret;
3450 }
3451
3452 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3453 struct ib_qp_attr *qp_attr,
3454 int *qp_attr_mask)
3455 {
3456 unsigned long flags;
3457 int ret;
3458
3459 spin_lock_irqsave(&cm_id_priv->lock, flags);
3460 switch (cm_id_priv->id.state) {
3461 case IB_CM_REQ_RCVD:
3462 case IB_CM_MRA_REQ_SENT:
3463 case IB_CM_REP_RCVD:
3464 case IB_CM_MRA_REP_SENT:
3465 case IB_CM_REP_SENT:
3466 case IB_CM_MRA_REP_RCVD:
3467 case IB_CM_ESTABLISHED:
3468 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3469 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3470 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3471 qp_attr->path_mtu = cm_id_priv->path_mtu;
3472 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3473 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3474 if (cm_id_priv->qp_type == IB_QPT_RC) {
3475 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3476 IB_QP_MIN_RNR_TIMER;
3477 qp_attr->max_dest_rd_atomic =
3478 cm_id_priv->responder_resources;
3479 qp_attr->min_rnr_timer = 0;
3480 }
3481 if (cm_id_priv->alt_av.ah_attr.dlid) {
3482 *qp_attr_mask |= IB_QP_ALT_PATH;
3483 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3484 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3485 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3486 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3487 }
3488 ret = 0;
3489 break;
3490 default:
3491 ret = -EINVAL;
3492 break;
3493 }
3494 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3495 return ret;
3496 }
3497
3498 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3499 struct ib_qp_attr *qp_attr,
3500 int *qp_attr_mask)
3501 {
3502 unsigned long flags;
3503 int ret;
3504
3505 spin_lock_irqsave(&cm_id_priv->lock, flags);
3506 switch (cm_id_priv->id.state) {
3507 /* Allow transition to RTS before sending REP */
3508 case IB_CM_REQ_RCVD:
3509 case IB_CM_MRA_REQ_SENT:
3510
3511 case IB_CM_REP_RCVD:
3512 case IB_CM_MRA_REP_SENT:
3513 case IB_CM_REP_SENT:
3514 case IB_CM_MRA_REP_RCVD:
3515 case IB_CM_ESTABLISHED:
3516 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
3517 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3518 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3519 if (cm_id_priv->qp_type == IB_QPT_RC) {
3520 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3521 IB_QP_RNR_RETRY |
3522 IB_QP_MAX_QP_RD_ATOMIC;
3523 qp_attr->timeout = cm_id_priv->av.timeout;
3524 qp_attr->retry_cnt = cm_id_priv->retry_count;
3525 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3526 qp_attr->max_rd_atomic =
3527 cm_id_priv->initiator_depth;
3528 }
3529 if (cm_id_priv->alt_av.ah_attr.dlid) {
3530 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3531 qp_attr->path_mig_state = IB_MIG_REARM;
3532 }
3533 } else {
3534 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
3535 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3536 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3537 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3538 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3539 qp_attr->path_mig_state = IB_MIG_REARM;
3540 }
3541 ret = 0;
3542 break;
3543 default:
3544 ret = -EINVAL;
3545 break;
3546 }
3547 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3548 return ret;
3549 }
3550
3551 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3552 struct ib_qp_attr *qp_attr,
3553 int *qp_attr_mask)
3554 {
3555 struct cm_id_private *cm_id_priv;
3556 int ret;
3557
3558 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3559 switch (qp_attr->qp_state) {
3560 case IB_QPS_INIT:
3561 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3562 break;
3563 case IB_QPS_RTR:
3564 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3565 break;
3566 case IB_QPS_RTS:
3567 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3568 break;
3569 default:
3570 ret = -EINVAL;
3571 break;
3572 }
3573 return ret;
3574 }
3575 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3576
3577 static void cm_get_ack_delay(struct cm_device *cm_dev)
3578 {
3579 struct ib_device_attr attr;
3580
3581 if (ib_query_device(cm_dev->ib_device, &attr))
3582 cm_dev->ack_delay = 0; /* acks will rely on packet life time */
3583 else
3584 cm_dev->ack_delay = attr.local_ca_ack_delay;
3585 }
3586
3587 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
3588 char *buf)
3589 {
3590 struct cm_counter_group *group;
3591 struct cm_counter_attribute *cm_attr;
3592
3593 group = container_of(obj, struct cm_counter_group, obj);
3594 cm_attr = container_of(attr, struct cm_counter_attribute, attr);
3595
3596 return sprintf(buf, "%ld\n",
3597 atomic_long_read(&group->counter[cm_attr->index]));
3598 }
3599
3600 static struct sysfs_ops cm_counter_ops = {
3601 .show = cm_show_counter
3602 };
3603
3604 static struct kobj_type cm_counter_obj_type = {
3605 .sysfs_ops = &cm_counter_ops,
3606 .default_attrs = cm_counter_default_attrs
3607 };
3608
3609 static void cm_release_port_obj(struct kobject *obj)
3610 {
3611 struct cm_port *cm_port;
3612
3613 cm_port = container_of(obj, struct cm_port, port_obj);
3614 kfree(cm_port);
3615 }
3616
3617 static struct kobj_type cm_port_obj_type = {
3618 .release = cm_release_port_obj
3619 };
3620
3621 struct class cm_class = {
3622 .name = "infiniband_cm",
3623 };
3624 EXPORT_SYMBOL(cm_class);
3625
3626 static int cm_create_port_fs(struct cm_port *port)
3627 {
3628 int i, ret;
3629
3630 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type,
3631 &port->cm_dev->device->kobj,
3632 "%d", port->port_num);
3633 if (ret) {
3634 kfree(port);
3635 return ret;
3636 }
3637
3638 for (i = 0; i < CM_COUNTER_GROUPS; i++) {
3639 ret = kobject_init_and_add(&port->counter_group[i].obj,
3640 &cm_counter_obj_type,
3641 &port->port_obj,
3642 "%s", counter_group_names[i]);
3643 if (ret)
3644 goto error;
3645 }
3646
3647 return 0;
3648
3649 error:
3650 while (i--)
3651 kobject_put(&port->counter_group[i].obj);
3652 kobject_put(&port->port_obj);
3653 return ret;
3654
3655 }
3656
3657 static void cm_remove_port_fs(struct cm_port *port)
3658 {
3659 int i;
3660
3661 for (i = 0; i < CM_COUNTER_GROUPS; i++)
3662 kobject_put(&port->counter_group[i].obj);
3663
3664 kobject_put(&port->port_obj);
3665 }
3666
3667 static void cm_add_one(struct ib_device *ib_device)
3668 {
3669 struct cm_device *cm_dev;
3670 struct cm_port *port;
3671 struct ib_mad_reg_req reg_req = {
3672 .mgmt_class = IB_MGMT_CLASS_CM,
3673 .mgmt_class_version = IB_CM_CLASS_VERSION
3674 };
3675 struct ib_port_modify port_modify = {
3676 .set_port_cap_mask = IB_PORT_CM_SUP
3677 };
3678 unsigned long flags;
3679 int ret;
3680 u8 i;
3681
3682 if (rdma_node_get_transport(ib_device->node_type) != RDMA_TRANSPORT_IB)
3683 return;
3684
3685 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) *
3686 ib_device->phys_port_cnt, GFP_KERNEL);
3687 if (!cm_dev)
3688 return;
3689
3690 cm_dev->ib_device = ib_device;
3691 cm_get_ack_delay(cm_dev);
3692
3693 cm_dev->device = device_create(&cm_class, &ib_device->dev,
3694 MKDEV(0, 0), NULL,
3695 "%s", ib_device->name);
3696 if (!cm_dev->device) {
3697 kfree(cm_dev);
3698 return;
3699 }
3700
3701 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3702 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3703 port = kzalloc(sizeof *port, GFP_KERNEL);
3704 if (!port)
3705 goto error1;
3706
3707 cm_dev->port[i-1] = port;
3708 port->cm_dev = cm_dev;
3709 port->port_num = i;
3710
3711 ret = cm_create_port_fs(port);
3712 if (ret)
3713 goto error1;
3714
3715 port->mad_agent = ib_register_mad_agent(ib_device, i,
3716 IB_QPT_GSI,
3717 &reg_req,
3718 0,
3719 cm_send_handler,
3720 cm_recv_handler,
3721 port);
3722 if (IS_ERR(port->mad_agent))
3723 goto error2;
3724
3725 ret = ib_modify_port(ib_device, i, 0, &port_modify);
3726 if (ret)
3727 goto error3;
3728 }
3729 ib_set_client_data(ib_device, &cm_client, cm_dev);
3730
3731 write_lock_irqsave(&cm.device_lock, flags);
3732 list_add_tail(&cm_dev->list, &cm.device_list);
3733 write_unlock_irqrestore(&cm.device_lock, flags);
3734 return;
3735
3736 error3:
3737 ib_unregister_mad_agent(port->mad_agent);
3738 error2:
3739 cm_remove_port_fs(port);
3740 error1:
3741 port_modify.set_port_cap_mask = 0;
3742 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3743 while (--i) {
3744 port = cm_dev->port[i-1];
3745 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3746 ib_unregister_mad_agent(port->mad_agent);
3747 cm_remove_port_fs(port);
3748 }
3749 device_unregister(cm_dev->device);
3750 kfree(cm_dev);
3751 }
3752
3753 static void cm_remove_one(struct ib_device *ib_device)
3754 {
3755 struct cm_device *cm_dev;
3756 struct cm_port *port;
3757 struct ib_port_modify port_modify = {
3758 .clr_port_cap_mask = IB_PORT_CM_SUP
3759 };
3760 unsigned long flags;
3761 int i;
3762
3763 cm_dev = ib_get_client_data(ib_device, &cm_client);
3764 if (!cm_dev)
3765 return;
3766
3767 write_lock_irqsave(&cm.device_lock, flags);
3768 list_del(&cm_dev->list);
3769 write_unlock_irqrestore(&cm.device_lock, flags);
3770
3771 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3772 port = cm_dev->port[i-1];
3773 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3774 ib_unregister_mad_agent(port->mad_agent);
3775 flush_workqueue(cm.wq);
3776 cm_remove_port_fs(port);
3777 }
3778 device_unregister(cm_dev->device);
3779 kfree(cm_dev);
3780 }
3781
3782 static int __init ib_cm_init(void)
3783 {
3784 int ret;
3785
3786 memset(&cm, 0, sizeof cm);
3787 INIT_LIST_HEAD(&cm.device_list);
3788 rwlock_init(&cm.device_lock);
3789 spin_lock_init(&cm.lock);
3790 cm.listen_service_table = RB_ROOT;
3791 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3792 cm.remote_id_table = RB_ROOT;
3793 cm.remote_qp_table = RB_ROOT;
3794 cm.remote_sidr_table = RB_ROOT;
3795 idr_init(&cm.local_id_table);
3796 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3797 idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3798 INIT_LIST_HEAD(&cm.timewait_list);
3799
3800 ret = class_register(&cm_class);
3801 if (ret)
3802 return -ENOMEM;
3803
3804 cm.wq = create_workqueue("ib_cm");
3805 if (!cm.wq) {
3806 ret = -ENOMEM;
3807 goto error1;
3808 }
3809
3810 ret = ib_register_client(&cm_client);
3811 if (ret)
3812 goto error2;
3813
3814 return 0;
3815 error2:
3816 destroy_workqueue(cm.wq);
3817 error1:
3818 class_unregister(&cm_class);
3819 return ret;
3820 }
3821
3822 static void __exit ib_cm_cleanup(void)
3823 {
3824 struct cm_timewait_info *timewait_info, *tmp;
3825
3826 spin_lock_irq(&cm.lock);
3827 list_for_each_entry(timewait_info, &cm.timewait_list, list)
3828 cancel_delayed_work(&timewait_info->work.work);
3829 spin_unlock_irq(&cm.lock);
3830
3831 ib_unregister_client(&cm_client);
3832 destroy_workqueue(cm.wq);
3833
3834 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
3835 list_del(&timewait_info->list);
3836 kfree(timewait_info);
3837 }
3838
3839 class_unregister(&cm_class);
3840 idr_destroy(&cm.local_id_table);
3841 }
3842
3843 module_init(ib_cm_init);
3844 module_exit(ib_cm_cleanup);
3845
Support for the Chinese Samsung S3C2440 based development boards