?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
x86: cpa self-test, WARN_ON()
[wrt350n-kernel.git] / drivers / infiniband / core / cm.c
blobc0150147d3478d5c539d2e3e320e1722c4b408ba
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 * $Id: cm.c 4311 2005-12-05 18:42:01Z sean.hefty $
36 */
37
38 #include <linux/completion.h>
39 #include <linux/dma-mapping.h>
40 #include <linux/device.h>
41 #include <linux/err.h>
42 #include <linux/idr.h>
43 #include <linux/interrupt.h>
44 #include <linux/random.h>
45 #include <linux/rbtree.h>
46 #include <linux/spinlock.h>
47 #include <linux/sysfs.h>
48 #include <linux/workqueue.h>
49
50 #include <rdma/ib_cache.h>
51 #include <rdma/ib_cm.h>
52 #include "cm_msgs.h"
53
54 MODULE_AUTHOR("Sean Hefty");
55 MODULE_DESCRIPTION("InfiniBand CM");
56 MODULE_LICENSE("Dual BSD/GPL");
57
58 static void cm_add_one(struct ib_device *device);
59 static void cm_remove_one(struct ib_device *device);
60
61 static struct ib_client cm_client = {
62 .name = "cm",
63 .add = cm_add_one,
64 .remove = cm_remove_one
65 };
66
67 static struct ib_cm {
68 spinlock_t lock;
69 struct list_head device_list;
70 rwlock_t device_lock;
71 struct rb_root listen_service_table;
72 u64 listen_service_id;
73 /* struct rb_root peer_service_table; todo: fix peer to peer */
74 struct rb_root remote_qp_table;
75 struct rb_root remote_id_table;
76 struct rb_root remote_sidr_table;
77 struct idr local_id_table;
78 __be32 random_id_operand;
79 struct list_head timewait_list;
80 struct workqueue_struct *wq;
81 } cm;
82
83 /* Counter indexes ordered by attribute ID */
84 enum {
85 CM_REQ_COUNTER,
86 CM_MRA_COUNTER,
87 CM_REJ_COUNTER,
88 CM_REP_COUNTER,
89 CM_RTU_COUNTER,
90 CM_DREQ_COUNTER,
91 CM_DREP_COUNTER,
92 CM_SIDR_REQ_COUNTER,
93 CM_SIDR_REP_COUNTER,
94 CM_LAP_COUNTER,
95 CM_APR_COUNTER,
96 CM_ATTR_COUNT,
97 CM_ATTR_ID_OFFSET = 0x0010,
98 };
99
100 enum {
101 CM_XMIT,
102 CM_XMIT_RETRIES,
103 CM_RECV,
104 CM_RECV_DUPLICATES,
105 CM_COUNTER_GROUPS
106 };
107
108 static char const counter_group_names[CM_COUNTER_GROUPS]
109 [sizeof("cm_rx_duplicates")] = {
110 "cm_tx_msgs", "cm_tx_retries",
111 "cm_rx_msgs", "cm_rx_duplicates"
112 };
113
114 struct cm_counter_group {
115 struct kobject obj;
116 atomic_long_t counter[CM_ATTR_COUNT];
117 };
118
119 struct cm_counter_attribute {
120 struct attribute attr;
121 int index;
122 };
123
124 #define CM_COUNTER_ATTR(_name, _index) \
125 struct cm_counter_attribute cm_##_name##_counter_attr = { \
126 .attr = { .name = __stringify(_name), .mode = 0444, .owner = THIS_MODULE }, \
127 .index = _index \
128 }
129
130 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
131 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
132 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
133 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
134 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
135 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
136 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
137 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
138 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
139 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
140 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
141
142 static struct attribute *cm_counter_default_attrs[] = {
143 &cm_req_counter_attr.attr,
144 &cm_mra_counter_attr.attr,
145 &cm_rej_counter_attr.attr,
146 &cm_rep_counter_attr.attr,
147 &cm_rtu_counter_attr.attr,
148 &cm_dreq_counter_attr.attr,
149 &cm_drep_counter_attr.attr,
150 &cm_sidr_req_counter_attr.attr,
151 &cm_sidr_rep_counter_attr.attr,
152 &cm_lap_counter_attr.attr,
153 &cm_apr_counter_attr.attr,
154 NULL
155 };
156
157 struct cm_port {
158 struct cm_device *cm_dev;
159 struct ib_mad_agent *mad_agent;
160 struct kobject port_obj;
161 u8 port_num;
162 struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
163 };
164
165 struct cm_device {
166 struct list_head list;
167 struct ib_device *device;
168 struct kobject dev_obj;
169 u8 ack_delay;
170 struct cm_port *port[0];
171 };
172
173 struct cm_av {
174 struct cm_port *port;
175 union ib_gid dgid;
176 struct ib_ah_attr ah_attr;
177 u16 pkey_index;
178 u8 timeout;
179 };
180
181 struct cm_work {
182 struct delayed_work work;
183 struct list_head list;
184 struct cm_port *port;
185 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
186 __be32 local_id; /* Established / timewait */
187 __be32 remote_id;
188 struct ib_cm_event cm_event;
189 struct ib_sa_path_rec path[0];
190 };
191
192 struct cm_timewait_info {
193 struct cm_work work; /* Must be first. */
194 struct list_head list;
195 struct rb_node remote_qp_node;
196 struct rb_node remote_id_node;
197 __be64 remote_ca_guid;
198 __be32 remote_qpn;
199 u8 inserted_remote_qp;
200 u8 inserted_remote_id;
201 };
202
203 struct cm_id_private {
204 struct ib_cm_id id;
205
206 struct rb_node service_node;
207 struct rb_node sidr_id_node;
208 spinlock_t lock; /* Do not acquire inside cm.lock */
209 struct completion comp;
210 atomic_t refcount;
211
212 struct ib_mad_send_buf *msg;
213 struct cm_timewait_info *timewait_info;
214 /* todo: use alternate port on send failure */
215 struct cm_av av;
216 struct cm_av alt_av;
217 struct ib_cm_compare_data *compare_data;
218
219 void *private_data;
220 __be64 tid;
221 __be32 local_qpn;
222 __be32 remote_qpn;
223 enum ib_qp_type qp_type;
224 __be32 sq_psn;
225 __be32 rq_psn;
226 int timeout_ms;
227 enum ib_mtu path_mtu;
228 __be16 pkey;
229 u8 private_data_len;
230 u8 max_cm_retries;
231 u8 peer_to_peer;
232 u8 responder_resources;
233 u8 initiator_depth;
234 u8 retry_count;
235 u8 rnr_retry_count;
236 u8 service_timeout;
237 u8 target_ack_delay;
238
239 struct list_head work_list;
240 atomic_t work_count;
241 };
242
243 static void cm_work_handler(struct work_struct *work);
244
245 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
246 {
247 if (atomic_dec_and_test(&cm_id_priv->refcount))
248 complete(&cm_id_priv->comp);
249 }
250
251 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
252 struct ib_mad_send_buf **msg)
253 {
254 struct ib_mad_agent *mad_agent;
255 struct ib_mad_send_buf *m;
256 struct ib_ah *ah;
257
258 mad_agent = cm_id_priv->av.port->mad_agent;
259 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
260 if (IS_ERR(ah))
261 return PTR_ERR(ah);
262
263 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
264 cm_id_priv->av.pkey_index,
265 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
266 GFP_ATOMIC);
267 if (IS_ERR(m)) {
268 ib_destroy_ah(ah);
269 return PTR_ERR(m);
270 }
271
272 /* Timeout set by caller if response is expected. */
273 m->ah = ah;
274 m->retries = cm_id_priv->max_cm_retries;
275
276 atomic_inc(&cm_id_priv->refcount);
277 m->context[0] = cm_id_priv;
278 *msg = m;
279 return 0;
280 }
281
282 static int cm_alloc_response_msg(struct cm_port *port,
283 struct ib_mad_recv_wc *mad_recv_wc,
284 struct ib_mad_send_buf **msg)
285 {
286 struct ib_mad_send_buf *m;
287 struct ib_ah *ah;
288
289 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
290 mad_recv_wc->recv_buf.grh, port->port_num);
291 if (IS_ERR(ah))
292 return PTR_ERR(ah);
293
294 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
295 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
296 GFP_ATOMIC);
297 if (IS_ERR(m)) {
298 ib_destroy_ah(ah);
299 return PTR_ERR(m);
300 }
301 m->ah = ah;
302 *msg = m;
303 return 0;
304 }
305
306 static void cm_free_msg(struct ib_mad_send_buf *msg)
307 {
308 ib_destroy_ah(msg->ah);
309 if (msg->context[0])
310 cm_deref_id(msg->context[0]);
311 ib_free_send_mad(msg);
312 }
313
314 static void * cm_copy_private_data(const void *private_data,
315 u8 private_data_len)
316 {
317 void *data;
318
319 if (!private_data || !private_data_len)
320 return NULL;
321
322 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
323 if (!data)
324 return ERR_PTR(-ENOMEM);
325
326 return data;
327 }
328
329 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
330 void *private_data, u8 private_data_len)
331 {
332 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
333 kfree(cm_id_priv->private_data);
334
335 cm_id_priv->private_data = private_data;
336 cm_id_priv->private_data_len = private_data_len;
337 }
338
339 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
340 struct ib_grh *grh, struct cm_av *av)
341 {
342 av->port = port;
343 av->pkey_index = wc->pkey_index;
344 ib_init_ah_from_wc(port->cm_dev->device, port->port_num, wc,
345 grh, &av->ah_attr);
346 }
347
348 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
349 {
350 struct cm_device *cm_dev;
351 struct cm_port *port = NULL;
352 unsigned long flags;
353 int ret;
354 u8 p;
355
356 read_lock_irqsave(&cm.device_lock, flags);
357 list_for_each_entry(cm_dev, &cm.device_list, list) {
358 if (!ib_find_cached_gid(cm_dev->device, &path->sgid,
359 &p, NULL)) {
360 port = cm_dev->port[p-1];
361 break;
362 }
363 }
364 read_unlock_irqrestore(&cm.device_lock, flags);
365
366 if (!port)
367 return -EINVAL;
368
369 ret = ib_find_cached_pkey(cm_dev->device, port->port_num,
370 be16_to_cpu(path->pkey), &av->pkey_index);
371 if (ret)
372 return ret;
373
374 av->port = port;
375 ib_init_ah_from_path(cm_dev->device, port->port_num, path,
376 &av->ah_attr);
377 av->timeout = path->packet_life_time + 1;
378 return 0;
379 }
380
381 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
382 {
383 unsigned long flags;
384 int ret, id;
385 static int next_id;
386
387 do {
388 spin_lock_irqsave(&cm.lock, flags);
389 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv,
390 next_id, &id);
391 if (!ret)
392 next_id = ((unsigned) id + 1) & MAX_ID_MASK;
393 spin_unlock_irqrestore(&cm.lock, flags);
394 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
395
396 cm_id_priv->id.local_id = (__force __be32) (id ^ cm.random_id_operand);
397 return ret;
398 }
399
400 static void cm_free_id(__be32 local_id)
401 {
402 spin_lock_irq(&cm.lock);
403 idr_remove(&cm.local_id_table,
404 (__force int) (local_id ^ cm.random_id_operand));
405 spin_unlock_irq(&cm.lock);
406 }
407
408 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
409 {
410 struct cm_id_private *cm_id_priv;
411
412 cm_id_priv = idr_find(&cm.local_id_table,
413 (__force int) (local_id ^ cm.random_id_operand));
414 if (cm_id_priv) {
415 if (cm_id_priv->id.remote_id == remote_id)
416 atomic_inc(&cm_id_priv->refcount);
417 else
418 cm_id_priv = NULL;
419 }
420
421 return cm_id_priv;
422 }
423
424 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
425 {
426 struct cm_id_private *cm_id_priv;
427
428 spin_lock_irq(&cm.lock);
429 cm_id_priv = cm_get_id(local_id, remote_id);
430 spin_unlock_irq(&cm.lock);
431
432 return cm_id_priv;
433 }
434
435 static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
436 {
437 int i;
438
439 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
440 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
441 ((unsigned long *) mask)[i];
442 }
443
444 static int cm_compare_data(struct ib_cm_compare_data *src_data,
445 struct ib_cm_compare_data *dst_data)
446 {
447 u8 src[IB_CM_COMPARE_SIZE];
448 u8 dst[IB_CM_COMPARE_SIZE];
449
450 if (!src_data || !dst_data)
451 return 0;
452
453 cm_mask_copy(src, src_data->data, dst_data->mask);
454 cm_mask_copy(dst, dst_data->data, src_data->mask);
455 return memcmp(src, dst, IB_CM_COMPARE_SIZE);
456 }
457
458 static int cm_compare_private_data(u8 *private_data,
459 struct ib_cm_compare_data *dst_data)
460 {
461 u8 src[IB_CM_COMPARE_SIZE];
462
463 if (!dst_data)
464 return 0;
465
466 cm_mask_copy(src, private_data, dst_data->mask);
467 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
468 }
469
470 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
471 {
472 struct rb_node **link = &cm.listen_service_table.rb_node;
473 struct rb_node *parent = NULL;
474 struct cm_id_private *cur_cm_id_priv;
475 __be64 service_id = cm_id_priv->id.service_id;
476 __be64 service_mask = cm_id_priv->id.service_mask;
477 int data_cmp;
478
479 while (*link) {
480 parent = *link;
481 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
482 service_node);
483 data_cmp = cm_compare_data(cm_id_priv->compare_data,
484 cur_cm_id_priv->compare_data);
485 if ((cur_cm_id_priv->id.service_mask & service_id) ==
486 (service_mask & cur_cm_id_priv->id.service_id) &&
487 (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
488 !data_cmp)
489 return cur_cm_id_priv;
490
491 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
492 link = &(*link)->rb_left;
493 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
494 link = &(*link)->rb_right;
495 else if (service_id < cur_cm_id_priv->id.service_id)
496 link = &(*link)->rb_left;
497 else if (service_id > cur_cm_id_priv->id.service_id)
498 link = &(*link)->rb_right;
499 else if (data_cmp < 0)
500 link = &(*link)->rb_left;
501 else
502 link = &(*link)->rb_right;
503 }
504 rb_link_node(&cm_id_priv->service_node, parent, link);
505 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
506 return NULL;
507 }
508
509 static struct cm_id_private * cm_find_listen(struct ib_device *device,
510 __be64 service_id,
511 u8 *private_data)
512 {
513 struct rb_node *node = cm.listen_service_table.rb_node;
514 struct cm_id_private *cm_id_priv;
515 int data_cmp;
516
517 while (node) {
518 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
519 data_cmp = cm_compare_private_data(private_data,
520 cm_id_priv->compare_data);
521 if ((cm_id_priv->id.service_mask & service_id) ==
522 cm_id_priv->id.service_id &&
523 (cm_id_priv->id.device == device) && !data_cmp)
524 return cm_id_priv;
525
526 if (device < cm_id_priv->id.device)
527 node = node->rb_left;
528 else if (device > cm_id_priv->id.device)
529 node = node->rb_right;
530 else if (service_id < cm_id_priv->id.service_id)
531 node = node->rb_left;
532 else if (service_id > cm_id_priv->id.service_id)
533 node = node->rb_right;
534 else if (data_cmp < 0)
535 node = node->rb_left;
536 else
537 node = node->rb_right;
538 }
539 return NULL;
540 }
541
542 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
543 *timewait_info)
544 {
545 struct rb_node **link = &cm.remote_id_table.rb_node;
546 struct rb_node *parent = NULL;
547 struct cm_timewait_info *cur_timewait_info;
548 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
549 __be32 remote_id = timewait_info->work.remote_id;
550
551 while (*link) {
552 parent = *link;
553 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
554 remote_id_node);
555 if (remote_id < cur_timewait_info->work.remote_id)
556 link = &(*link)->rb_left;
557 else if (remote_id > cur_timewait_info->work.remote_id)
558 link = &(*link)->rb_right;
559 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
560 link = &(*link)->rb_left;
561 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
562 link = &(*link)->rb_right;
563 else
564 return cur_timewait_info;
565 }
566 timewait_info->inserted_remote_id = 1;
567 rb_link_node(&timewait_info->remote_id_node, parent, link);
568 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
569 return NULL;
570 }
571
572 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
573 __be32 remote_id)
574 {
575 struct rb_node *node = cm.remote_id_table.rb_node;
576 struct cm_timewait_info *timewait_info;
577
578 while (node) {
579 timewait_info = rb_entry(node, struct cm_timewait_info,
580 remote_id_node);
581 if (remote_id < timewait_info->work.remote_id)
582 node = node->rb_left;
583 else if (remote_id > timewait_info->work.remote_id)
584 node = node->rb_right;
585 else if (remote_ca_guid < timewait_info->remote_ca_guid)
586 node = node->rb_left;
587 else if (remote_ca_guid > timewait_info->remote_ca_guid)
588 node = node->rb_right;
589 else
590 return timewait_info;
591 }
592 return NULL;
593 }
594
595 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
596 *timewait_info)
597 {
598 struct rb_node **link = &cm.remote_qp_table.rb_node;
599 struct rb_node *parent = NULL;
600 struct cm_timewait_info *cur_timewait_info;
601 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
602 __be32 remote_qpn = timewait_info->remote_qpn;
603
604 while (*link) {
605 parent = *link;
606 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
607 remote_qp_node);
608 if (remote_qpn < cur_timewait_info->remote_qpn)
609 link = &(*link)->rb_left;
610 else if (remote_qpn > cur_timewait_info->remote_qpn)
611 link = &(*link)->rb_right;
612 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
613 link = &(*link)->rb_left;
614 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
615 link = &(*link)->rb_right;
616 else
617 return cur_timewait_info;
618 }
619 timewait_info->inserted_remote_qp = 1;
620 rb_link_node(&timewait_info->remote_qp_node, parent, link);
621 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
622 return NULL;
623 }
624
625 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
626 *cm_id_priv)
627 {
628 struct rb_node **link = &cm.remote_sidr_table.rb_node;
629 struct rb_node *parent = NULL;
630 struct cm_id_private *cur_cm_id_priv;
631 union ib_gid *port_gid = &cm_id_priv->av.dgid;
632 __be32 remote_id = cm_id_priv->id.remote_id;
633
634 while (*link) {
635 parent = *link;
636 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
637 sidr_id_node);
638 if (remote_id < cur_cm_id_priv->id.remote_id)
639 link = &(*link)->rb_left;
640 else if (remote_id > cur_cm_id_priv->id.remote_id)
641 link = &(*link)->rb_right;
642 else {
643 int cmp;
644 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
645 sizeof *port_gid);
646 if (cmp < 0)
647 link = &(*link)->rb_left;
648 else if (cmp > 0)
649 link = &(*link)->rb_right;
650 else
651 return cur_cm_id_priv;
652 }
653 }
654 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
655 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
656 return NULL;
657 }
658
659 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
660 enum ib_cm_sidr_status status)
661 {
662 struct ib_cm_sidr_rep_param param;
663
664 memset(&param, 0, sizeof param);
665 param.status = status;
666 ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
667 }
668
669 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
670 ib_cm_handler cm_handler,
671 void *context)
672 {
673 struct cm_id_private *cm_id_priv;
674 int ret;
675
676 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
677 if (!cm_id_priv)
678 return ERR_PTR(-ENOMEM);
679
680 cm_id_priv->id.state = IB_CM_IDLE;
681 cm_id_priv->id.device = device;
682 cm_id_priv->id.cm_handler = cm_handler;
683 cm_id_priv->id.context = context;
684 cm_id_priv->id.remote_cm_qpn = 1;
685 ret = cm_alloc_id(cm_id_priv);
686 if (ret)
687 goto error;
688
689 spin_lock_init(&cm_id_priv->lock);
690 init_completion(&cm_id_priv->comp);
691 INIT_LIST_HEAD(&cm_id_priv->work_list);
692 atomic_set(&cm_id_priv->work_count, -1);
693 atomic_set(&cm_id_priv->refcount, 1);
694 return &cm_id_priv->id;
695
696 error:
697 kfree(cm_id_priv);
698 return ERR_PTR(-ENOMEM);
699 }
700 EXPORT_SYMBOL(ib_create_cm_id);
701
702 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
703 {
704 struct cm_work *work;
705
706 if (list_empty(&cm_id_priv->work_list))
707 return NULL;
708
709 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
710 list_del(&work->list);
711 return work;
712 }
713
714 static void cm_free_work(struct cm_work *work)
715 {
716 if (work->mad_recv_wc)
717 ib_free_recv_mad(work->mad_recv_wc);
718 kfree(work);
719 }
720
721 static inline int cm_convert_to_ms(int iba_time)
722 {
723 /* approximate conversion to ms from 4.096us x 2^iba_time */
724 return 1 << max(iba_time - 8, 0);
725 }
726
727 /*
728 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
729 * Because of how ack_timeout is stored, adding one doubles the timeout.
730 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
731 * increment it (round up) only if the other is within 50%.
732 */
733 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
734 {
735 int ack_timeout = packet_life_time + 1;
736
737 if (ack_timeout >= ca_ack_delay)
738 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
739 else
740 ack_timeout = ca_ack_delay +
741 (ack_timeout >= (ca_ack_delay - 1));
742
743 return min(31, ack_timeout);
744 }
745
746 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
747 {
748 if (timewait_info->inserted_remote_id) {
749 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
750 timewait_info->inserted_remote_id = 0;
751 }
752
753 if (timewait_info->inserted_remote_qp) {
754 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
755 timewait_info->inserted_remote_qp = 0;
756 }
757 }
758
759 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
760 {
761 struct cm_timewait_info *timewait_info;
762
763 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
764 if (!timewait_info)
765 return ERR_PTR(-ENOMEM);
766
767 timewait_info->work.local_id = local_id;
768 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
769 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
770 return timewait_info;
771 }
772
773 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
774 {
775 int wait_time;
776 unsigned long flags;
777
778 spin_lock_irqsave(&cm.lock, flags);
779 cm_cleanup_timewait(cm_id_priv->timewait_info);
780 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
781 spin_unlock_irqrestore(&cm.lock, flags);
782
783 /*
784 * The cm_id could be destroyed by the user before we exit timewait.
785 * To protect against this, we search for the cm_id after exiting
786 * timewait before notifying the user that we've exited timewait.
787 */
788 cm_id_priv->id.state = IB_CM_TIMEWAIT;
789 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
790 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
791 msecs_to_jiffies(wait_time));
792 cm_id_priv->timewait_info = NULL;
793 }
794
795 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
796 {
797 unsigned long flags;
798
799 cm_id_priv->id.state = IB_CM_IDLE;
800 if (cm_id_priv->timewait_info) {
801 spin_lock_irqsave(&cm.lock, flags);
802 cm_cleanup_timewait(cm_id_priv->timewait_info);
803 spin_unlock_irqrestore(&cm.lock, flags);
804 kfree(cm_id_priv->timewait_info);
805 cm_id_priv->timewait_info = NULL;
806 }
807 }
808
809 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
810 {
811 struct cm_id_private *cm_id_priv;
812 struct cm_work *work;
813
814 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
815 retest:
816 spin_lock_irq(&cm_id_priv->lock);
817 switch (cm_id->state) {
818 case IB_CM_LISTEN:
819 cm_id->state = IB_CM_IDLE;
820 spin_unlock_irq(&cm_id_priv->lock);
821 spin_lock_irq(&cm.lock);
822 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
823 spin_unlock_irq(&cm.lock);
824 break;
825 case IB_CM_SIDR_REQ_SENT:
826 cm_id->state = IB_CM_IDLE;
827 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
828 spin_unlock_irq(&cm_id_priv->lock);
829 break;
830 case IB_CM_SIDR_REQ_RCVD:
831 spin_unlock_irq(&cm_id_priv->lock);
832 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
833 break;
834 case IB_CM_REQ_SENT:
835 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
836 spin_unlock_irq(&cm_id_priv->lock);
837 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
838 &cm_id_priv->id.device->node_guid,
839 sizeof cm_id_priv->id.device->node_guid,
840 NULL, 0);
841 break;
842 case IB_CM_REQ_RCVD:
843 if (err == -ENOMEM) {
844 /* Do not reject to allow future retries. */
845 cm_reset_to_idle(cm_id_priv);
846 spin_unlock_irq(&cm_id_priv->lock);
847 } else {
848 spin_unlock_irq(&cm_id_priv->lock);
849 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
850 NULL, 0, NULL, 0);
851 }
852 break;
853 case IB_CM_MRA_REQ_RCVD:
854 case IB_CM_REP_SENT:
855 case IB_CM_MRA_REP_RCVD:
856 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
857 /* Fall through */
858 case IB_CM_MRA_REQ_SENT:
859 case IB_CM_REP_RCVD:
860 case IB_CM_MRA_REP_SENT:
861 spin_unlock_irq(&cm_id_priv->lock);
862 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
863 NULL, 0, NULL, 0);
864 break;
865 case IB_CM_ESTABLISHED:
866 spin_unlock_irq(&cm_id_priv->lock);
867 ib_send_cm_dreq(cm_id, NULL, 0);
868 goto retest;
869 case IB_CM_DREQ_SENT:
870 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
871 cm_enter_timewait(cm_id_priv);
872 spin_unlock_irq(&cm_id_priv->lock);
873 break;
874 case IB_CM_DREQ_RCVD:
875 spin_unlock_irq(&cm_id_priv->lock);
876 ib_send_cm_drep(cm_id, NULL, 0);
877 break;
878 default:
879 spin_unlock_irq(&cm_id_priv->lock);
880 break;
881 }
882
883 cm_free_id(cm_id->local_id);
884 cm_deref_id(cm_id_priv);
885 wait_for_completion(&cm_id_priv->comp);
886 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
887 cm_free_work(work);
888 kfree(cm_id_priv->compare_data);
889 kfree(cm_id_priv->private_data);
890 kfree(cm_id_priv);
891 }
892
893 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
894 {
895 cm_destroy_id(cm_id, 0);
896 }
897 EXPORT_SYMBOL(ib_destroy_cm_id);
898
899 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
900 struct ib_cm_compare_data *compare_data)
901 {
902 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
903 unsigned long flags;
904 int ret = 0;
905
906 service_mask = service_mask ? service_mask :
907 __constant_cpu_to_be64(~0ULL);
908 service_id &= service_mask;
909 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
910 (service_id != IB_CM_ASSIGN_SERVICE_ID))
911 return -EINVAL;
912
913 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
914 if (cm_id->state != IB_CM_IDLE)
915 return -EINVAL;
916
917 if (compare_data) {
918 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
919 GFP_KERNEL);
920 if (!cm_id_priv->compare_data)
921 return -ENOMEM;
922 cm_mask_copy(cm_id_priv->compare_data->data,
923 compare_data->data, compare_data->mask);
924 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
925 IB_CM_COMPARE_SIZE);
926 }
927
928 cm_id->state = IB_CM_LISTEN;
929
930 spin_lock_irqsave(&cm.lock, flags);
931 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
932 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
933 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
934 } else {
935 cm_id->service_id = service_id;
936 cm_id->service_mask = service_mask;
937 }
938 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
939 spin_unlock_irqrestore(&cm.lock, flags);
940
941 if (cur_cm_id_priv) {
942 cm_id->state = IB_CM_IDLE;
943 kfree(cm_id_priv->compare_data);
944 cm_id_priv->compare_data = NULL;
945 ret = -EBUSY;
946 }
947 return ret;
948 }
949 EXPORT_SYMBOL(ib_cm_listen);
950
951 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
952 enum cm_msg_sequence msg_seq)
953 {
954 u64 hi_tid, low_tid;
955
956 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
957 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
958 (msg_seq << 30));
959 return cpu_to_be64(hi_tid | low_tid);
960 }
961
962 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
963 __be16 attr_id, __be64 tid)
964 {
965 hdr->base_version = IB_MGMT_BASE_VERSION;
966 hdr->mgmt_class = IB_MGMT_CLASS_CM;
967 hdr->class_version = IB_CM_CLASS_VERSION;
968 hdr->method = IB_MGMT_METHOD_SEND;
969 hdr->attr_id = attr_id;
970 hdr->tid = tid;
971 }
972
973 static void cm_format_req(struct cm_req_msg *req_msg,
974 struct cm_id_private *cm_id_priv,
975 struct ib_cm_req_param *param)
976 {
977 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
978 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
979
980 req_msg->local_comm_id = cm_id_priv->id.local_id;
981 req_msg->service_id = param->service_id;
982 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
983 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
984 cm_req_set_resp_res(req_msg, param->responder_resources);
985 cm_req_set_init_depth(req_msg, param->initiator_depth);
986 cm_req_set_remote_resp_timeout(req_msg,
987 param->remote_cm_response_timeout);
988 cm_req_set_qp_type(req_msg, param->qp_type);
989 cm_req_set_flow_ctrl(req_msg, param->flow_control);
990 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
991 cm_req_set_local_resp_timeout(req_msg,
992 param->local_cm_response_timeout);
993 cm_req_set_retry_count(req_msg, param->retry_count);
994 req_msg->pkey = param->primary_path->pkey;
995 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
996 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
997 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
998 cm_req_set_srq(req_msg, param->srq);
999
1000 req_msg->primary_local_lid = param->primary_path->slid;
1001 req_msg->primary_remote_lid = param->primary_path->dlid;
1002 req_msg->primary_local_gid = param->primary_path->sgid;
1003 req_msg->primary_remote_gid = param->primary_path->dgid;
1004 cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label);
1005 cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate);
1006 req_msg->primary_traffic_class = param->primary_path->traffic_class;
1007 req_msg->primary_hop_limit = param->primary_path->hop_limit;
1008 cm_req_set_primary_sl(req_msg, param->primary_path->sl);
1009 cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */
1010 cm_req_set_primary_local_ack_timeout(req_msg,
1011 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1012 param->primary_path->packet_life_time));
1013
1014 if (param->alternate_path) {
1015 req_msg->alt_local_lid = param->alternate_path->slid;
1016 req_msg->alt_remote_lid = param->alternate_path->dlid;
1017 req_msg->alt_local_gid = param->alternate_path->sgid;
1018 req_msg->alt_remote_gid = param->alternate_path->dgid;
1019 cm_req_set_alt_flow_label(req_msg,
1020 param->alternate_path->flow_label);
1021 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate);
1022 req_msg->alt_traffic_class = param->alternate_path->traffic_class;
1023 req_msg->alt_hop_limit = param->alternate_path->hop_limit;
1024 cm_req_set_alt_sl(req_msg, param->alternate_path->sl);
1025 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */
1026 cm_req_set_alt_local_ack_timeout(req_msg,
1027 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1028 param->alternate_path->packet_life_time));
1029 }
1030
1031 if (param->private_data && param->private_data_len)
1032 memcpy(req_msg->private_data, param->private_data,
1033 param->private_data_len);
1034 }
1035
1036 static int cm_validate_req_param(struct ib_cm_req_param *param)
1037 {
1038 /* peer-to-peer not supported */
1039 if (param->peer_to_peer)
1040 return -EINVAL;
1041
1042 if (!param->primary_path)
1043 return -EINVAL;
1044
1045 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
1046 return -EINVAL;
1047
1048 if (param->private_data &&
1049 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1050 return -EINVAL;
1051
1052 if (param->alternate_path &&
1053 (param->alternate_path->pkey != param->primary_path->pkey ||
1054 param->alternate_path->mtu != param->primary_path->mtu))
1055 return -EINVAL;
1056
1057 return 0;
1058 }
1059
1060 int ib_send_cm_req(struct ib_cm_id *cm_id,
1061 struct ib_cm_req_param *param)
1062 {
1063 struct cm_id_private *cm_id_priv;
1064 struct cm_req_msg *req_msg;
1065 unsigned long flags;
1066 int ret;
1067
1068 ret = cm_validate_req_param(param);
1069 if (ret)
1070 return ret;
1071
1072 /* Verify that we're not in timewait. */
1073 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1074 spin_lock_irqsave(&cm_id_priv->lock, flags);
1075 if (cm_id->state != IB_CM_IDLE) {
1076 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1077 ret = -EINVAL;
1078 goto out;
1079 }
1080 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1081
1082 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1083 id.local_id);
1084 if (IS_ERR(cm_id_priv->timewait_info)) {
1085 ret = PTR_ERR(cm_id_priv->timewait_info);
1086 goto out;
1087 }
1088
1089 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
1090 if (ret)
1091 goto error1;
1092 if (param->alternate_path) {
1093 ret = cm_init_av_by_path(param->alternate_path,
1094 &cm_id_priv->alt_av);
1095 if (ret)
1096 goto error1;
1097 }
1098 cm_id->service_id = param->service_id;
1099 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
1100 cm_id_priv->timeout_ms = cm_convert_to_ms(
1101 param->primary_path->packet_life_time) * 2 +
1102 cm_convert_to_ms(
1103 param->remote_cm_response_timeout);
1104 cm_id_priv->max_cm_retries = param->max_cm_retries;
1105 cm_id_priv->initiator_depth = param->initiator_depth;
1106 cm_id_priv->responder_resources = param->responder_resources;
1107 cm_id_priv->retry_count = param->retry_count;
1108 cm_id_priv->path_mtu = param->primary_path->mtu;
1109 cm_id_priv->pkey = param->primary_path->pkey;
1110 cm_id_priv->qp_type = param->qp_type;
1111
1112 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1113 if (ret)
1114 goto error1;
1115
1116 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1117 cm_format_req(req_msg, cm_id_priv, param);
1118 cm_id_priv->tid = req_msg->hdr.tid;
1119 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1120 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1121
1122 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1123 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1124
1125 spin_lock_irqsave(&cm_id_priv->lock, flags);
1126 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1127 if (ret) {
1128 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1129 goto error2;
1130 }
1131 BUG_ON(cm_id->state != IB_CM_IDLE);
1132 cm_id->state = IB_CM_REQ_SENT;
1133 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1134 return 0;
1135
1136 error2: cm_free_msg(cm_id_priv->msg);
1137 error1: kfree(cm_id_priv->timewait_info);
1138 out: return ret;
1139 }
1140 EXPORT_SYMBOL(ib_send_cm_req);
1141
1142 static int cm_issue_rej(struct cm_port *port,
1143 struct ib_mad_recv_wc *mad_recv_wc,
1144 enum ib_cm_rej_reason reason,
1145 enum cm_msg_response msg_rejected,
1146 void *ari, u8 ari_length)
1147 {
1148 struct ib_mad_send_buf *msg = NULL;
1149 struct cm_rej_msg *rej_msg, *rcv_msg;
1150 int ret;
1151
1152 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1153 if (ret)
1154 return ret;
1155
1156 /* We just need common CM header information. Cast to any message. */
1157 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1158 rej_msg = (struct cm_rej_msg *) msg->mad;
1159
1160 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1161 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1162 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1163 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1164 rej_msg->reason = cpu_to_be16(reason);
1165
1166 if (ari && ari_length) {
1167 cm_rej_set_reject_info_len(rej_msg, ari_length);
1168 memcpy(rej_msg->ari, ari, ari_length);
1169 }
1170
1171 ret = ib_post_send_mad(msg, NULL);
1172 if (ret)
1173 cm_free_msg(msg);
1174
1175 return ret;
1176 }
1177
1178 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1179 __be32 local_qpn, __be32 remote_qpn)
1180 {
1181 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1182 ((local_ca_guid == remote_ca_guid) &&
1183 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1184 }
1185
1186 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1187 struct ib_sa_path_rec *primary_path,
1188 struct ib_sa_path_rec *alt_path)
1189 {
1190 memset(primary_path, 0, sizeof *primary_path);
1191 primary_path->dgid = req_msg->primary_local_gid;
1192 primary_path->sgid = req_msg->primary_remote_gid;
1193 primary_path->dlid = req_msg->primary_local_lid;
1194 primary_path->slid = req_msg->primary_remote_lid;
1195 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1196 primary_path->hop_limit = req_msg->primary_hop_limit;
1197 primary_path->traffic_class = req_msg->primary_traffic_class;
1198 primary_path->reversible = 1;
1199 primary_path->pkey = req_msg->pkey;
1200 primary_path->sl = cm_req_get_primary_sl(req_msg);
1201 primary_path->mtu_selector = IB_SA_EQ;
1202 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1203 primary_path->rate_selector = IB_SA_EQ;
1204 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1205 primary_path->packet_life_time_selector = IB_SA_EQ;
1206 primary_path->packet_life_time =
1207 cm_req_get_primary_local_ack_timeout(req_msg);
1208 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1209
1210 if (req_msg->alt_local_lid) {
1211 memset(alt_path, 0, sizeof *alt_path);
1212 alt_path->dgid = req_msg->alt_local_gid;
1213 alt_path->sgid = req_msg->alt_remote_gid;
1214 alt_path->dlid = req_msg->alt_local_lid;
1215 alt_path->slid = req_msg->alt_remote_lid;
1216 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1217 alt_path->hop_limit = req_msg->alt_hop_limit;
1218 alt_path->traffic_class = req_msg->alt_traffic_class;
1219 alt_path->reversible = 1;
1220 alt_path->pkey = req_msg->pkey;
1221 alt_path->sl = cm_req_get_alt_sl(req_msg);
1222 alt_path->mtu_selector = IB_SA_EQ;
1223 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1224 alt_path->rate_selector = IB_SA_EQ;
1225 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1226 alt_path->packet_life_time_selector = IB_SA_EQ;
1227 alt_path->packet_life_time =
1228 cm_req_get_alt_local_ack_timeout(req_msg);
1229 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1230 }
1231 }
1232
1233 static void cm_format_req_event(struct cm_work *work,
1234 struct cm_id_private *cm_id_priv,
1235 struct ib_cm_id *listen_id)
1236 {
1237 struct cm_req_msg *req_msg;
1238 struct ib_cm_req_event_param *param;
1239
1240 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1241 param = &work->cm_event.param.req_rcvd;
1242 param->listen_id = listen_id;
1243 param->port = cm_id_priv->av.port->port_num;
1244 param->primary_path = &work->path[0];
1245 if (req_msg->alt_local_lid)
1246 param->alternate_path = &work->path[1];
1247 else
1248 param->alternate_path = NULL;
1249 param->remote_ca_guid = req_msg->local_ca_guid;
1250 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1251 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1252 param->qp_type = cm_req_get_qp_type(req_msg);
1253 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1254 param->responder_resources = cm_req_get_init_depth(req_msg);
1255 param->initiator_depth = cm_req_get_resp_res(req_msg);
1256 param->local_cm_response_timeout =
1257 cm_req_get_remote_resp_timeout(req_msg);
1258 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1259 param->remote_cm_response_timeout =
1260 cm_req_get_local_resp_timeout(req_msg);
1261 param->retry_count = cm_req_get_retry_count(req_msg);
1262 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1263 param->srq = cm_req_get_srq(req_msg);
1264 work->cm_event.private_data = &req_msg->private_data;
1265 }
1266
1267 static void cm_process_work(struct cm_id_private *cm_id_priv,
1268 struct cm_work *work)
1269 {
1270 int ret;
1271
1272 /* We will typically only have the current event to report. */
1273 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1274 cm_free_work(work);
1275
1276 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1277 spin_lock_irq(&cm_id_priv->lock);
1278 work = cm_dequeue_work(cm_id_priv);
1279 spin_unlock_irq(&cm_id_priv->lock);
1280 BUG_ON(!work);
1281 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1282 &work->cm_event);
1283 cm_free_work(work);
1284 }
1285 cm_deref_id(cm_id_priv);
1286 if (ret)
1287 cm_destroy_id(&cm_id_priv->id, ret);
1288 }
1289
1290 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1291 struct cm_id_private *cm_id_priv,
1292 enum cm_msg_response msg_mraed, u8 service_timeout,
1293 const void *private_data, u8 private_data_len)
1294 {
1295 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1296 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1297 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1298 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1299 cm_mra_set_service_timeout(mra_msg, service_timeout);
1300
1301 if (private_data && private_data_len)
1302 memcpy(mra_msg->private_data, private_data, private_data_len);
1303 }
1304
1305 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1306 struct cm_id_private *cm_id_priv,
1307 enum ib_cm_rej_reason reason,
1308 void *ari,
1309 u8 ari_length,
1310 const void *private_data,
1311 u8 private_data_len)
1312 {
1313 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1314 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1315
1316 switch(cm_id_priv->id.state) {
1317 case IB_CM_REQ_RCVD:
1318 rej_msg->local_comm_id = 0;
1319 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1320 break;
1321 case IB_CM_MRA_REQ_SENT:
1322 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1323 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1324 break;
1325 case IB_CM_REP_RCVD:
1326 case IB_CM_MRA_REP_SENT:
1327 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1328 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1329 break;
1330 default:
1331 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1332 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1333 break;
1334 }
1335
1336 rej_msg->reason = cpu_to_be16(reason);
1337 if (ari && ari_length) {
1338 cm_rej_set_reject_info_len(rej_msg, ari_length);
1339 memcpy(rej_msg->ari, ari, ari_length);
1340 }
1341
1342 if (private_data && private_data_len)
1343 memcpy(rej_msg->private_data, private_data, private_data_len);
1344 }
1345
1346 static void cm_dup_req_handler(struct cm_work *work,
1347 struct cm_id_private *cm_id_priv)
1348 {
1349 struct ib_mad_send_buf *msg = NULL;
1350 int ret;
1351
1352 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1353 counter[CM_REQ_COUNTER]);
1354
1355 /* Quick state check to discard duplicate REQs. */
1356 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1357 return;
1358
1359 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1360 if (ret)
1361 return;
1362
1363 spin_lock_irq(&cm_id_priv->lock);
1364 switch (cm_id_priv->id.state) {
1365 case IB_CM_MRA_REQ_SENT:
1366 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1367 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1368 cm_id_priv->private_data,
1369 cm_id_priv->private_data_len);
1370 break;
1371 case IB_CM_TIMEWAIT:
1372 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1373 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1374 break;
1375 default:
1376 goto unlock;
1377 }
1378 spin_unlock_irq(&cm_id_priv->lock);
1379
1380 ret = ib_post_send_mad(msg, NULL);
1381 if (ret)
1382 goto free;
1383 return;
1384
1385 unlock: spin_unlock_irq(&cm_id_priv->lock);
1386 free: cm_free_msg(msg);
1387 }
1388
1389 static struct cm_id_private * cm_match_req(struct cm_work *work,
1390 struct cm_id_private *cm_id_priv)
1391 {
1392 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1393 struct cm_timewait_info *timewait_info;
1394 struct cm_req_msg *req_msg;
1395
1396 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1397
1398 /* Check for possible duplicate REQ. */
1399 spin_lock_irq(&cm.lock);
1400 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1401 if (timewait_info) {
1402 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1403 timewait_info->work.remote_id);
1404 spin_unlock_irq(&cm.lock);
1405 if (cur_cm_id_priv) {
1406 cm_dup_req_handler(work, cur_cm_id_priv);
1407 cm_deref_id(cur_cm_id_priv);
1408 }
1409 return NULL;
1410 }
1411
1412 /* Check for stale connections. */
1413 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1414 if (timewait_info) {
1415 cm_cleanup_timewait(cm_id_priv->timewait_info);
1416 spin_unlock_irq(&cm.lock);
1417 cm_issue_rej(work->port, work->mad_recv_wc,
1418 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1419 NULL, 0);
1420 return NULL;
1421 }
1422
1423 /* Find matching listen request. */
1424 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1425 req_msg->service_id,
1426 req_msg->private_data);
1427 if (!listen_cm_id_priv) {
1428 cm_cleanup_timewait(cm_id_priv->timewait_info);
1429 spin_unlock_irq(&cm.lock);
1430 cm_issue_rej(work->port, work->mad_recv_wc,
1431 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1432 NULL, 0);
1433 goto out;
1434 }
1435 atomic_inc(&listen_cm_id_priv->refcount);
1436 atomic_inc(&cm_id_priv->refcount);
1437 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1438 atomic_inc(&cm_id_priv->work_count);
1439 spin_unlock_irq(&cm.lock);
1440 out:
1441 return listen_cm_id_priv;
1442 }
1443
1444 static int cm_req_handler(struct cm_work *work)
1445 {
1446 struct ib_cm_id *cm_id;
1447 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1448 struct cm_req_msg *req_msg;
1449 int ret;
1450
1451 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1452
1453 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
1454 if (IS_ERR(cm_id))
1455 return PTR_ERR(cm_id);
1456
1457 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1458 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1459 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1460 work->mad_recv_wc->recv_buf.grh,
1461 &cm_id_priv->av);
1462 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1463 id.local_id);
1464 if (IS_ERR(cm_id_priv->timewait_info)) {
1465 ret = PTR_ERR(cm_id_priv->timewait_info);
1466 goto destroy;
1467 }
1468 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1469 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1470 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1471
1472 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1473 if (!listen_cm_id_priv) {
1474 ret = -EINVAL;
1475 kfree(cm_id_priv->timewait_info);
1476 goto destroy;
1477 }
1478
1479 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1480 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1481 cm_id_priv->id.service_id = req_msg->service_id;
1482 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
1483
1484 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1485 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1486 if (ret) {
1487 ib_get_cached_gid(work->port->cm_dev->device,
1488 work->port->port_num, 0, &work->path[0].sgid);
1489 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1490 &work->path[0].sgid, sizeof work->path[0].sgid,
1491 NULL, 0);
1492 goto rejected;
1493 }
1494 if (req_msg->alt_local_lid) {
1495 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1496 if (ret) {
1497 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1498 &work->path[0].sgid,
1499 sizeof work->path[0].sgid, NULL, 0);
1500 goto rejected;
1501 }
1502 }
1503 cm_id_priv->tid = req_msg->hdr.tid;
1504 cm_id_priv->timeout_ms = cm_convert_to_ms(
1505 cm_req_get_local_resp_timeout(req_msg));
1506 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1507 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1508 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1509 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1510 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1511 cm_id_priv->pkey = req_msg->pkey;
1512 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1513 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1514 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1515 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1516
1517 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1518 cm_process_work(cm_id_priv, work);
1519 cm_deref_id(listen_cm_id_priv);
1520 return 0;
1521
1522 rejected:
1523 atomic_dec(&cm_id_priv->refcount);
1524 cm_deref_id(listen_cm_id_priv);
1525 destroy:
1526 ib_destroy_cm_id(cm_id);
1527 return ret;
1528 }
1529
1530 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1531 struct cm_id_private *cm_id_priv,
1532 struct ib_cm_rep_param *param)
1533 {
1534 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1535 rep_msg->local_comm_id = cm_id_priv->id.local_id;
1536 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1537 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1538 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1539 rep_msg->resp_resources = param->responder_resources;
1540 rep_msg->initiator_depth = param->initiator_depth;
1541 cm_rep_set_target_ack_delay(rep_msg,
1542 cm_id_priv->av.port->cm_dev->ack_delay);
1543 cm_rep_set_failover(rep_msg, param->failover_accepted);
1544 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1545 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1546 cm_rep_set_srq(rep_msg, param->srq);
1547 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1548
1549 if (param->private_data && param->private_data_len)
1550 memcpy(rep_msg->private_data, param->private_data,
1551 param->private_data_len);
1552 }
1553
1554 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1555 struct ib_cm_rep_param *param)
1556 {
1557 struct cm_id_private *cm_id_priv;
1558 struct ib_mad_send_buf *msg;
1559 struct cm_rep_msg *rep_msg;
1560 unsigned long flags;
1561 int ret;
1562
1563 if (param->private_data &&
1564 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1565 return -EINVAL;
1566
1567 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1568 spin_lock_irqsave(&cm_id_priv->lock, flags);
1569 if (cm_id->state != IB_CM_REQ_RCVD &&
1570 cm_id->state != IB_CM_MRA_REQ_SENT) {
1571 ret = -EINVAL;
1572 goto out;
1573 }
1574
1575 ret = cm_alloc_msg(cm_id_priv, &msg);
1576 if (ret)
1577 goto out;
1578
1579 rep_msg = (struct cm_rep_msg *) msg->mad;
1580 cm_format_rep(rep_msg, cm_id_priv, param);
1581 msg->timeout_ms = cm_id_priv->timeout_ms;
1582 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1583
1584 ret = ib_post_send_mad(msg, NULL);
1585 if (ret) {
1586 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1587 cm_free_msg(msg);
1588 return ret;
1589 }
1590
1591 cm_id->state = IB_CM_REP_SENT;
1592 cm_id_priv->msg = msg;
1593 cm_id_priv->initiator_depth = param->initiator_depth;
1594 cm_id_priv->responder_resources = param->responder_resources;
1595 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1596 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1597
1598 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1599 return ret;
1600 }
1601 EXPORT_SYMBOL(ib_send_cm_rep);
1602
1603 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1604 struct cm_id_private *cm_id_priv,
1605 const void *private_data,
1606 u8 private_data_len)
1607 {
1608 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1609 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1610 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1611
1612 if (private_data && private_data_len)
1613 memcpy(rtu_msg->private_data, private_data, private_data_len);
1614 }
1615
1616 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1617 const void *private_data,
1618 u8 private_data_len)
1619 {
1620 struct cm_id_private *cm_id_priv;
1621 struct ib_mad_send_buf *msg;
1622 unsigned long flags;
1623 void *data;
1624 int ret;
1625
1626 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1627 return -EINVAL;
1628
1629 data = cm_copy_private_data(private_data, private_data_len);
1630 if (IS_ERR(data))
1631 return PTR_ERR(data);
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_REP_RCVD &&
1636 cm_id->state != IB_CM_MRA_REP_SENT) {
1637 ret = -EINVAL;
1638 goto error;
1639 }
1640
1641 ret = cm_alloc_msg(cm_id_priv, &msg);
1642 if (ret)
1643 goto error;
1644
1645 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1646 private_data, private_data_len);
1647
1648 ret = ib_post_send_mad(msg, NULL);
1649 if (ret) {
1650 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1651 cm_free_msg(msg);
1652 kfree(data);
1653 return ret;
1654 }
1655
1656 cm_id->state = IB_CM_ESTABLISHED;
1657 cm_set_private_data(cm_id_priv, data, private_data_len);
1658 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1659 return 0;
1660
1661 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1662 kfree(data);
1663 return ret;
1664 }
1665 EXPORT_SYMBOL(ib_send_cm_rtu);
1666
1667 static void cm_format_rep_event(struct cm_work *work)
1668 {
1669 struct cm_rep_msg *rep_msg;
1670 struct ib_cm_rep_event_param *param;
1671
1672 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1673 param = &work->cm_event.param.rep_rcvd;
1674 param->remote_ca_guid = rep_msg->local_ca_guid;
1675 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1676 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1677 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1678 param->responder_resources = rep_msg->initiator_depth;
1679 param->initiator_depth = rep_msg->resp_resources;
1680 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1681 param->failover_accepted = cm_rep_get_failover(rep_msg);
1682 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1683 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1684 param->srq = cm_rep_get_srq(rep_msg);
1685 work->cm_event.private_data = &rep_msg->private_data;
1686 }
1687
1688 static void cm_dup_rep_handler(struct cm_work *work)
1689 {
1690 struct cm_id_private *cm_id_priv;
1691 struct cm_rep_msg *rep_msg;
1692 struct ib_mad_send_buf *msg = NULL;
1693 int ret;
1694
1695 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1696 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1697 rep_msg->local_comm_id);
1698 if (!cm_id_priv)
1699 return;
1700
1701 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1702 counter[CM_REP_COUNTER]);
1703 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1704 if (ret)
1705 goto deref;
1706
1707 spin_lock_irq(&cm_id_priv->lock);
1708 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1709 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1710 cm_id_priv->private_data,
1711 cm_id_priv->private_data_len);
1712 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1713 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1714 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1715 cm_id_priv->private_data,
1716 cm_id_priv->private_data_len);
1717 else
1718 goto unlock;
1719 spin_unlock_irq(&cm_id_priv->lock);
1720
1721 ret = ib_post_send_mad(msg, NULL);
1722 if (ret)
1723 goto free;
1724 goto deref;
1725
1726 unlock: spin_unlock_irq(&cm_id_priv->lock);
1727 free: cm_free_msg(msg);
1728 deref: cm_deref_id(cm_id_priv);
1729 }
1730
1731 static int cm_rep_handler(struct cm_work *work)
1732 {
1733 struct cm_id_private *cm_id_priv;
1734 struct cm_rep_msg *rep_msg;
1735 int ret;
1736
1737 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1738 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1739 if (!cm_id_priv) {
1740 cm_dup_rep_handler(work);
1741 return -EINVAL;
1742 }
1743
1744 cm_format_rep_event(work);
1745
1746 spin_lock_irq(&cm_id_priv->lock);
1747 switch (cm_id_priv->id.state) {
1748 case IB_CM_REQ_SENT:
1749 case IB_CM_MRA_REQ_RCVD:
1750 break;
1751 default:
1752 spin_unlock_irq(&cm_id_priv->lock);
1753 ret = -EINVAL;
1754 goto error;
1755 }
1756
1757 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1758 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1759 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1760
1761 spin_lock(&cm.lock);
1762 /* Check for duplicate REP. */
1763 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1764 spin_unlock(&cm.lock);
1765 spin_unlock_irq(&cm_id_priv->lock);
1766 ret = -EINVAL;
1767 goto error;
1768 }
1769 /* Check for a stale connection. */
1770 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1771 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1772 &cm.remote_id_table);
1773 cm_id_priv->timewait_info->inserted_remote_id = 0;
1774 spin_unlock(&cm.lock);
1775 spin_unlock_irq(&cm_id_priv->lock);
1776 cm_issue_rej(work->port, work->mad_recv_wc,
1777 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1778 NULL, 0);
1779 ret = -EINVAL;
1780 goto error;
1781 }
1782 spin_unlock(&cm.lock);
1783
1784 cm_id_priv->id.state = IB_CM_REP_RCVD;
1785 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1786 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1787 cm_id_priv->initiator_depth = rep_msg->resp_resources;
1788 cm_id_priv->responder_resources = rep_msg->initiator_depth;
1789 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1790 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1791 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1792 cm_id_priv->av.timeout =
1793 cm_ack_timeout(cm_id_priv->target_ack_delay,
1794 cm_id_priv->av.timeout - 1);
1795 cm_id_priv->alt_av.timeout =
1796 cm_ack_timeout(cm_id_priv->target_ack_delay,
1797 cm_id_priv->alt_av.timeout - 1);
1798
1799 /* todo: handle peer_to_peer */
1800
1801 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1802 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1803 if (!ret)
1804 list_add_tail(&work->list, &cm_id_priv->work_list);
1805 spin_unlock_irq(&cm_id_priv->lock);
1806
1807 if (ret)
1808 cm_process_work(cm_id_priv, work);
1809 else
1810 cm_deref_id(cm_id_priv);
1811 return 0;
1812
1813 error:
1814 cm_deref_id(cm_id_priv);
1815 return ret;
1816 }
1817
1818 static int cm_establish_handler(struct cm_work *work)
1819 {
1820 struct cm_id_private *cm_id_priv;
1821 int ret;
1822
1823 /* See comment in cm_establish about lookup. */
1824 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1825 if (!cm_id_priv)
1826 return -EINVAL;
1827
1828 spin_lock_irq(&cm_id_priv->lock);
1829 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1830 spin_unlock_irq(&cm_id_priv->lock);
1831 goto out;
1832 }
1833
1834 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1835 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1836 if (!ret)
1837 list_add_tail(&work->list, &cm_id_priv->work_list);
1838 spin_unlock_irq(&cm_id_priv->lock);
1839
1840 if (ret)
1841 cm_process_work(cm_id_priv, work);
1842 else
1843 cm_deref_id(cm_id_priv);
1844 return 0;
1845 out:
1846 cm_deref_id(cm_id_priv);
1847 return -EINVAL;
1848 }
1849
1850 static int cm_rtu_handler(struct cm_work *work)
1851 {
1852 struct cm_id_private *cm_id_priv;
1853 struct cm_rtu_msg *rtu_msg;
1854 int ret;
1855
1856 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1857 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1858 rtu_msg->local_comm_id);
1859 if (!cm_id_priv)
1860 return -EINVAL;
1861
1862 work->cm_event.private_data = &rtu_msg->private_data;
1863
1864 spin_lock_irq(&cm_id_priv->lock);
1865 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1866 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1867 spin_unlock_irq(&cm_id_priv->lock);
1868 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1869 counter[CM_RTU_COUNTER]);
1870 goto out;
1871 }
1872 cm_id_priv->id.state = IB_CM_ESTABLISHED;
1873
1874 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1875 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1876 if (!ret)
1877 list_add_tail(&work->list, &cm_id_priv->work_list);
1878 spin_unlock_irq(&cm_id_priv->lock);
1879
1880 if (ret)
1881 cm_process_work(cm_id_priv, work);
1882 else
1883 cm_deref_id(cm_id_priv);
1884 return 0;
1885 out:
1886 cm_deref_id(cm_id_priv);
1887 return -EINVAL;
1888 }
1889
1890 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1891 struct cm_id_private *cm_id_priv,
1892 const void *private_data,
1893 u8 private_data_len)
1894 {
1895 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1896 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1897 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1898 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1899 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1900
1901 if (private_data && private_data_len)
1902 memcpy(dreq_msg->private_data, private_data, private_data_len);
1903 }
1904
1905 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1906 const void *private_data,
1907 u8 private_data_len)
1908 {
1909 struct cm_id_private *cm_id_priv;
1910 struct ib_mad_send_buf *msg;
1911 unsigned long flags;
1912 int ret;
1913
1914 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1915 return -EINVAL;
1916
1917 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1918 spin_lock_irqsave(&cm_id_priv->lock, flags);
1919 if (cm_id->state != IB_CM_ESTABLISHED) {
1920 ret = -EINVAL;
1921 goto out;
1922 }
1923
1924 ret = cm_alloc_msg(cm_id_priv, &msg);
1925 if (ret) {
1926 cm_enter_timewait(cm_id_priv);
1927 goto out;
1928 }
1929
1930 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1931 private_data, private_data_len);
1932 msg->timeout_ms = cm_id_priv->timeout_ms;
1933 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
1934
1935 ret = ib_post_send_mad(msg, NULL);
1936 if (ret) {
1937 cm_enter_timewait(cm_id_priv);
1938 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1939 cm_free_msg(msg);
1940 return ret;
1941 }
1942
1943 cm_id->state = IB_CM_DREQ_SENT;
1944 cm_id_priv->msg = msg;
1945 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1946 return ret;
1947 }
1948 EXPORT_SYMBOL(ib_send_cm_dreq);
1949
1950 static void cm_format_drep(struct cm_drep_msg *drep_msg,
1951 struct cm_id_private *cm_id_priv,
1952 const void *private_data,
1953 u8 private_data_len)
1954 {
1955 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
1956 drep_msg->local_comm_id = cm_id_priv->id.local_id;
1957 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1958
1959 if (private_data && private_data_len)
1960 memcpy(drep_msg->private_data, private_data, private_data_len);
1961 }
1962
1963 int ib_send_cm_drep(struct ib_cm_id *cm_id,
1964 const void *private_data,
1965 u8 private_data_len)
1966 {
1967 struct cm_id_private *cm_id_priv;
1968 struct ib_mad_send_buf *msg;
1969 unsigned long flags;
1970 void *data;
1971 int ret;
1972
1973 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
1974 return -EINVAL;
1975
1976 data = cm_copy_private_data(private_data, private_data_len);
1977 if (IS_ERR(data))
1978 return PTR_ERR(data);
1979
1980 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1981 spin_lock_irqsave(&cm_id_priv->lock, flags);
1982 if (cm_id->state != IB_CM_DREQ_RCVD) {
1983 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1984 kfree(data);
1985 return -EINVAL;
1986 }
1987
1988 cm_set_private_data(cm_id_priv, data, private_data_len);
1989 cm_enter_timewait(cm_id_priv);
1990
1991 ret = cm_alloc_msg(cm_id_priv, &msg);
1992 if (ret)
1993 goto out;
1994
1995 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1996 private_data, private_data_len);
1997
1998 ret = ib_post_send_mad(msg, NULL);
1999 if (ret) {
2000 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2001 cm_free_msg(msg);
2002 return ret;
2003 }
2004
2005 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2006 return ret;
2007 }
2008 EXPORT_SYMBOL(ib_send_cm_drep);
2009
2010 static int cm_issue_drep(struct cm_port *port,
2011 struct ib_mad_recv_wc *mad_recv_wc)
2012 {
2013 struct ib_mad_send_buf *msg = NULL;
2014 struct cm_dreq_msg *dreq_msg;
2015 struct cm_drep_msg *drep_msg;
2016 int ret;
2017
2018 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2019 if (ret)
2020 return ret;
2021
2022 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2023 drep_msg = (struct cm_drep_msg *) msg->mad;
2024
2025 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2026 drep_msg->remote_comm_id = dreq_msg->local_comm_id;
2027 drep_msg->local_comm_id = dreq_msg->remote_comm_id;
2028
2029 ret = ib_post_send_mad(msg, NULL);
2030 if (ret)
2031 cm_free_msg(msg);
2032
2033 return ret;
2034 }
2035
2036 static int cm_dreq_handler(struct cm_work *work)
2037 {
2038 struct cm_id_private *cm_id_priv;
2039 struct cm_dreq_msg *dreq_msg;
2040 struct ib_mad_send_buf *msg = NULL;
2041 int ret;
2042
2043 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2044 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
2045 dreq_msg->local_comm_id);
2046 if (!cm_id_priv) {
2047 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2048 counter[CM_DREQ_COUNTER]);
2049 cm_issue_drep(work->port, work->mad_recv_wc);
2050 return -EINVAL;
2051 }
2052
2053 work->cm_event.private_data = &dreq_msg->private_data;
2054
2055 spin_lock_irq(&cm_id_priv->lock);
2056 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
2057 goto unlock;
2058
2059 switch (cm_id_priv->id.state) {
2060 case IB_CM_REP_SENT:
2061 case IB_CM_DREQ_SENT:
2062 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2063 break;
2064 case IB_CM_ESTABLISHED:
2065 case IB_CM_MRA_REP_RCVD:
2066 break;
2067 case IB_CM_TIMEWAIT:
2068 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2069 counter[CM_DREQ_COUNTER]);
2070 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2071 goto unlock;
2072
2073 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2074 cm_id_priv->private_data,
2075 cm_id_priv->private_data_len);
2076 spin_unlock_irq(&cm_id_priv->lock);
2077
2078 if (ib_post_send_mad(msg, NULL))
2079 cm_free_msg(msg);
2080 goto deref;
2081 case IB_CM_DREQ_RCVD:
2082 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2083 counter[CM_DREQ_COUNTER]);
2084 goto unlock;
2085 default:
2086 goto unlock;
2087 }
2088 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2089 cm_id_priv->tid = dreq_msg->hdr.tid;
2090 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2091 if (!ret)
2092 list_add_tail(&work->list, &cm_id_priv->work_list);
2093 spin_unlock_irq(&cm_id_priv->lock);
2094
2095 if (ret)
2096 cm_process_work(cm_id_priv, work);
2097 else
2098 cm_deref_id(cm_id_priv);
2099 return 0;
2100
2101 unlock: spin_unlock_irq(&cm_id_priv->lock);
2102 deref: cm_deref_id(cm_id_priv);
2103 return -EINVAL;
2104 }
2105
2106 static int cm_drep_handler(struct cm_work *work)
2107 {
2108 struct cm_id_private *cm_id_priv;
2109 struct cm_drep_msg *drep_msg;
2110 int ret;
2111
2112 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2113 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2114 drep_msg->local_comm_id);
2115 if (!cm_id_priv)
2116 return -EINVAL;
2117
2118 work->cm_event.private_data = &drep_msg->private_data;
2119
2120 spin_lock_irq(&cm_id_priv->lock);
2121 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2122 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2123 spin_unlock_irq(&cm_id_priv->lock);
2124 goto out;
2125 }
2126 cm_enter_timewait(cm_id_priv);
2127
2128 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2129 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2130 if (!ret)
2131 list_add_tail(&work->list, &cm_id_priv->work_list);
2132 spin_unlock_irq(&cm_id_priv->lock);
2133
2134 if (ret)
2135 cm_process_work(cm_id_priv, work);
2136 else
2137 cm_deref_id(cm_id_priv);
2138 return 0;
2139 out:
2140 cm_deref_id(cm_id_priv);
2141 return -EINVAL;
2142 }
2143
2144 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2145 enum ib_cm_rej_reason reason,
2146 void *ari,
2147 u8 ari_length,
2148 const void *private_data,
2149 u8 private_data_len)
2150 {
2151 struct cm_id_private *cm_id_priv;
2152 struct ib_mad_send_buf *msg;
2153 unsigned long flags;
2154 int ret;
2155
2156 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2157 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2158 return -EINVAL;
2159
2160 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2161
2162 spin_lock_irqsave(&cm_id_priv->lock, flags);
2163 switch (cm_id->state) {
2164 case IB_CM_REQ_SENT:
2165 case IB_CM_MRA_REQ_RCVD:
2166 case IB_CM_REQ_RCVD:
2167 case IB_CM_MRA_REQ_SENT:
2168 case IB_CM_REP_RCVD:
2169 case IB_CM_MRA_REP_SENT:
2170 ret = cm_alloc_msg(cm_id_priv, &msg);
2171 if (!ret)
2172 cm_format_rej((struct cm_rej_msg *) msg->mad,
2173 cm_id_priv, reason, ari, ari_length,
2174 private_data, private_data_len);
2175
2176 cm_reset_to_idle(cm_id_priv);
2177 break;
2178 case IB_CM_REP_SENT:
2179 case IB_CM_MRA_REP_RCVD:
2180 ret = cm_alloc_msg(cm_id_priv, &msg);
2181 if (!ret)
2182 cm_format_rej((struct cm_rej_msg *) msg->mad,
2183 cm_id_priv, reason, ari, ari_length,
2184 private_data, private_data_len);
2185
2186 cm_enter_timewait(cm_id_priv);
2187 break;
2188 default:
2189 ret = -EINVAL;
2190 goto out;
2191 }
2192
2193 if (ret)
2194 goto out;
2195
2196 ret = ib_post_send_mad(msg, NULL);
2197 if (ret)
2198 cm_free_msg(msg);
2199
2200 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2201 return ret;
2202 }
2203 EXPORT_SYMBOL(ib_send_cm_rej);
2204
2205 static void cm_format_rej_event(struct cm_work *work)
2206 {
2207 struct cm_rej_msg *rej_msg;
2208 struct ib_cm_rej_event_param *param;
2209
2210 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2211 param = &work->cm_event.param.rej_rcvd;
2212 param->ari = rej_msg->ari;
2213 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2214 param->reason = __be16_to_cpu(rej_msg->reason);
2215 work->cm_event.private_data = &rej_msg->private_data;
2216 }
2217
2218 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2219 {
2220 struct cm_timewait_info *timewait_info;
2221 struct cm_id_private *cm_id_priv;
2222 __be32 remote_id;
2223
2224 remote_id = rej_msg->local_comm_id;
2225
2226 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2227 spin_lock_irq(&cm.lock);
2228 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2229 remote_id);
2230 if (!timewait_info) {
2231 spin_unlock_irq(&cm.lock);
2232 return NULL;
2233 }
2234 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2235 (timewait_info->work.local_id ^
2236 cm.random_id_operand));
2237 if (cm_id_priv) {
2238 if (cm_id_priv->id.remote_id == remote_id)
2239 atomic_inc(&cm_id_priv->refcount);
2240 else
2241 cm_id_priv = NULL;
2242 }
2243 spin_unlock_irq(&cm.lock);
2244 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2245 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2246 else
2247 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2248
2249 return cm_id_priv;
2250 }
2251
2252 static int cm_rej_handler(struct cm_work *work)
2253 {
2254 struct cm_id_private *cm_id_priv;
2255 struct cm_rej_msg *rej_msg;
2256 int ret;
2257
2258 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2259 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2260 if (!cm_id_priv)
2261 return -EINVAL;
2262
2263 cm_format_rej_event(work);
2264
2265 spin_lock_irq(&cm_id_priv->lock);
2266 switch (cm_id_priv->id.state) {
2267 case IB_CM_REQ_SENT:
2268 case IB_CM_MRA_REQ_RCVD:
2269 case IB_CM_REP_SENT:
2270 case IB_CM_MRA_REP_RCVD:
2271 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2272 /* fall through */
2273 case IB_CM_REQ_RCVD:
2274 case IB_CM_MRA_REQ_SENT:
2275 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2276 cm_enter_timewait(cm_id_priv);
2277 else
2278 cm_reset_to_idle(cm_id_priv);
2279 break;
2280 case IB_CM_DREQ_SENT:
2281 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2282 /* fall through */
2283 case IB_CM_REP_RCVD:
2284 case IB_CM_MRA_REP_SENT:
2285 case IB_CM_ESTABLISHED:
2286 cm_enter_timewait(cm_id_priv);
2287 break;
2288 default:
2289 spin_unlock_irq(&cm_id_priv->lock);
2290 ret = -EINVAL;
2291 goto out;
2292 }
2293
2294 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2295 if (!ret)
2296 list_add_tail(&work->list, &cm_id_priv->work_list);
2297 spin_unlock_irq(&cm_id_priv->lock);
2298
2299 if (ret)
2300 cm_process_work(cm_id_priv, work);
2301 else
2302 cm_deref_id(cm_id_priv);
2303 return 0;
2304 out:
2305 cm_deref_id(cm_id_priv);
2306 return -EINVAL;
2307 }
2308
2309 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2310 u8 service_timeout,
2311 const void *private_data,
2312 u8 private_data_len)
2313 {
2314 struct cm_id_private *cm_id_priv;
2315 struct ib_mad_send_buf *msg;
2316 enum ib_cm_state cm_state;
2317 enum ib_cm_lap_state lap_state;
2318 enum cm_msg_response msg_response;
2319 void *data;
2320 unsigned long flags;
2321 int ret;
2322
2323 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2324 return -EINVAL;
2325
2326 data = cm_copy_private_data(private_data, private_data_len);
2327 if (IS_ERR(data))
2328 return PTR_ERR(data);
2329
2330 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2331
2332 spin_lock_irqsave(&cm_id_priv->lock, flags);
2333 switch(cm_id_priv->id.state) {
2334 case IB_CM_REQ_RCVD:
2335 cm_state = IB_CM_MRA_REQ_SENT;
2336 lap_state = cm_id->lap_state;
2337 msg_response = CM_MSG_RESPONSE_REQ;
2338 break;
2339 case IB_CM_REP_RCVD:
2340 cm_state = IB_CM_MRA_REP_SENT;
2341 lap_state = cm_id->lap_state;
2342 msg_response = CM_MSG_RESPONSE_REP;
2343 break;
2344 case IB_CM_ESTABLISHED:
2345 cm_state = cm_id->state;
2346 lap_state = IB_CM_MRA_LAP_SENT;
2347 msg_response = CM_MSG_RESPONSE_OTHER;
2348 break;
2349 default:
2350 ret = -EINVAL;
2351 goto error1;
2352 }
2353
2354 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
2355 ret = cm_alloc_msg(cm_id_priv, &msg);
2356 if (ret)
2357 goto error1;
2358
2359 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2360 msg_response, service_timeout,
2361 private_data, private_data_len);
2362 ret = ib_post_send_mad(msg, NULL);
2363 if (ret)
2364 goto error2;
2365 }
2366
2367 cm_id->state = cm_state;
2368 cm_id->lap_state = lap_state;
2369 cm_id_priv->service_timeout = service_timeout;
2370 cm_set_private_data(cm_id_priv, data, private_data_len);
2371 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2372 return 0;
2373
2374 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2375 kfree(data);
2376 return ret;
2377
2378 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2379 kfree(data);
2380 cm_free_msg(msg);
2381 return ret;
2382 }
2383 EXPORT_SYMBOL(ib_send_cm_mra);
2384
2385 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2386 {
2387 switch (cm_mra_get_msg_mraed(mra_msg)) {
2388 case CM_MSG_RESPONSE_REQ:
2389 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2390 case CM_MSG_RESPONSE_REP:
2391 case CM_MSG_RESPONSE_OTHER:
2392 return cm_acquire_id(mra_msg->remote_comm_id,
2393 mra_msg->local_comm_id);
2394 default:
2395 return NULL;
2396 }
2397 }
2398
2399 static int cm_mra_handler(struct cm_work *work)
2400 {
2401 struct cm_id_private *cm_id_priv;
2402 struct cm_mra_msg *mra_msg;
2403 int timeout, ret;
2404
2405 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2406 cm_id_priv = cm_acquire_mraed_id(mra_msg);
2407 if (!cm_id_priv)
2408 return -EINVAL;
2409
2410 work->cm_event.private_data = &mra_msg->private_data;
2411 work->cm_event.param.mra_rcvd.service_timeout =
2412 cm_mra_get_service_timeout(mra_msg);
2413 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2414 cm_convert_to_ms(cm_id_priv->av.timeout);
2415
2416 spin_lock_irq(&cm_id_priv->lock);
2417 switch (cm_id_priv->id.state) {
2418 case IB_CM_REQ_SENT:
2419 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2420 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2421 cm_id_priv->msg, timeout))
2422 goto out;
2423 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2424 break;
2425 case IB_CM_REP_SENT:
2426 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2427 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2428 cm_id_priv->msg, timeout))
2429 goto out;
2430 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2431 break;
2432 case IB_CM_ESTABLISHED:
2433 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2434 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2435 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2436 cm_id_priv->msg, timeout)) {
2437 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2438 atomic_long_inc(&work->port->
2439 counter_group[CM_RECV_DUPLICATES].
2440 counter[CM_MRA_COUNTER]);
2441 goto out;
2442 }
2443 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2444 break;
2445 case IB_CM_MRA_REQ_RCVD:
2446 case IB_CM_MRA_REP_RCVD:
2447 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2448 counter[CM_MRA_COUNTER]);
2449 /* fall through */
2450 default:
2451 goto out;
2452 }
2453
2454 cm_id_priv->msg->context[1] = (void *) (unsigned long)
2455 cm_id_priv->id.state;
2456 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2457 if (!ret)
2458 list_add_tail(&work->list, &cm_id_priv->work_list);
2459 spin_unlock_irq(&cm_id_priv->lock);
2460
2461 if (ret)
2462 cm_process_work(cm_id_priv, work);
2463 else
2464 cm_deref_id(cm_id_priv);
2465 return 0;
2466 out:
2467 spin_unlock_irq(&cm_id_priv->lock);
2468 cm_deref_id(cm_id_priv);
2469 return -EINVAL;
2470 }
2471
2472 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2473 struct cm_id_private *cm_id_priv,
2474 struct ib_sa_path_rec *alternate_path,
2475 const void *private_data,
2476 u8 private_data_len)
2477 {
2478 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2479 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2480 lap_msg->local_comm_id = cm_id_priv->id.local_id;
2481 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2482 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2483 /* todo: need remote CM response timeout */
2484 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2485 lap_msg->alt_local_lid = alternate_path->slid;
2486 lap_msg->alt_remote_lid = alternate_path->dlid;
2487 lap_msg->alt_local_gid = alternate_path->sgid;
2488 lap_msg->alt_remote_gid = alternate_path->dgid;
2489 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2490 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2491 lap_msg->alt_hop_limit = alternate_path->hop_limit;
2492 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2493 cm_lap_set_sl(lap_msg, alternate_path->sl);
2494 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2495 cm_lap_set_local_ack_timeout(lap_msg,
2496 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
2497 alternate_path->packet_life_time));
2498
2499 if (private_data && private_data_len)
2500 memcpy(lap_msg->private_data, private_data, private_data_len);
2501 }
2502
2503 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2504 struct ib_sa_path_rec *alternate_path,
2505 const void *private_data,
2506 u8 private_data_len)
2507 {
2508 struct cm_id_private *cm_id_priv;
2509 struct ib_mad_send_buf *msg;
2510 unsigned long flags;
2511 int ret;
2512
2513 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2514 return -EINVAL;
2515
2516 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2517 spin_lock_irqsave(&cm_id_priv->lock, flags);
2518 if (cm_id->state != IB_CM_ESTABLISHED ||
2519 (cm_id->lap_state != IB_CM_LAP_UNINIT &&
2520 cm_id->lap_state != IB_CM_LAP_IDLE)) {
2521 ret = -EINVAL;
2522 goto out;
2523 }
2524
2525 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av);
2526 if (ret)
2527 goto out;
2528 cm_id_priv->alt_av.timeout =
2529 cm_ack_timeout(cm_id_priv->target_ack_delay,
2530 cm_id_priv->alt_av.timeout - 1);
2531
2532 ret = cm_alloc_msg(cm_id_priv, &msg);
2533 if (ret)
2534 goto out;
2535
2536 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2537 alternate_path, private_data, private_data_len);
2538 msg->timeout_ms = cm_id_priv->timeout_ms;
2539 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2540
2541 ret = ib_post_send_mad(msg, NULL);
2542 if (ret) {
2543 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2544 cm_free_msg(msg);
2545 return ret;
2546 }
2547
2548 cm_id->lap_state = IB_CM_LAP_SENT;
2549 cm_id_priv->msg = msg;
2550
2551 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2552 return ret;
2553 }
2554 EXPORT_SYMBOL(ib_send_cm_lap);
2555
2556 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
2557 struct ib_sa_path_rec *path,
2558 struct cm_lap_msg *lap_msg)
2559 {
2560 memset(path, 0, sizeof *path);
2561 path->dgid = lap_msg->alt_local_gid;
2562 path->sgid = lap_msg->alt_remote_gid;
2563 path->dlid = lap_msg->alt_local_lid;
2564 path->slid = lap_msg->alt_remote_lid;
2565 path->flow_label = cm_lap_get_flow_label(lap_msg);
2566 path->hop_limit = lap_msg->alt_hop_limit;
2567 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2568 path->reversible = 1;
2569 path->pkey = cm_id_priv->pkey;
2570 path->sl = cm_lap_get_sl(lap_msg);
2571 path->mtu_selector = IB_SA_EQ;
2572 path->mtu = cm_id_priv->path_mtu;
2573 path->rate_selector = IB_SA_EQ;
2574 path->rate = cm_lap_get_packet_rate(lap_msg);
2575 path->packet_life_time_selector = IB_SA_EQ;
2576 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2577 path->packet_life_time -= (path->packet_life_time > 0);
2578 }
2579
2580 static int cm_lap_handler(struct cm_work *work)
2581 {
2582 struct cm_id_private *cm_id_priv;
2583 struct cm_lap_msg *lap_msg;
2584 struct ib_cm_lap_event_param *param;
2585 struct ib_mad_send_buf *msg = NULL;
2586 int ret;
2587
2588 /* todo: verify LAP request and send reject APR if invalid. */
2589 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2590 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2591 lap_msg->local_comm_id);
2592 if (!cm_id_priv)
2593 return -EINVAL;
2594
2595 param = &work->cm_event.param.lap_rcvd;
2596 param->alternate_path = &work->path[0];
2597 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
2598 work->cm_event.private_data = &lap_msg->private_data;
2599
2600 spin_lock_irq(&cm_id_priv->lock);
2601 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2602 goto unlock;
2603
2604 switch (cm_id_priv->id.lap_state) {
2605 case IB_CM_LAP_UNINIT:
2606 case IB_CM_LAP_IDLE:
2607 break;
2608 case IB_CM_MRA_LAP_SENT:
2609 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2610 counter[CM_LAP_COUNTER]);
2611 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2612 goto unlock;
2613
2614 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2615 CM_MSG_RESPONSE_OTHER,
2616 cm_id_priv->service_timeout,
2617 cm_id_priv->private_data,
2618 cm_id_priv->private_data_len);
2619 spin_unlock_irq(&cm_id_priv->lock);
2620
2621 if (ib_post_send_mad(msg, NULL))
2622 cm_free_msg(msg);
2623 goto deref;
2624 case IB_CM_LAP_RCVD:
2625 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2626 counter[CM_LAP_COUNTER]);
2627 goto unlock;
2628 default:
2629 goto unlock;
2630 }
2631
2632 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2633 cm_id_priv->tid = lap_msg->hdr.tid;
2634 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2635 work->mad_recv_wc->recv_buf.grh,
2636 &cm_id_priv->av);
2637 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av);
2638 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2639 if (!ret)
2640 list_add_tail(&work->list, &cm_id_priv->work_list);
2641 spin_unlock_irq(&cm_id_priv->lock);
2642
2643 if (ret)
2644 cm_process_work(cm_id_priv, work);
2645 else
2646 cm_deref_id(cm_id_priv);
2647 return 0;
2648
2649 unlock: spin_unlock_irq(&cm_id_priv->lock);
2650 deref: cm_deref_id(cm_id_priv);
2651 return -EINVAL;
2652 }
2653
2654 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2655 struct cm_id_private *cm_id_priv,
2656 enum ib_cm_apr_status status,
2657 void *info,
2658 u8 info_length,
2659 const void *private_data,
2660 u8 private_data_len)
2661 {
2662 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2663 apr_msg->local_comm_id = cm_id_priv->id.local_id;
2664 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2665 apr_msg->ap_status = (u8) status;
2666
2667 if (info && info_length) {
2668 apr_msg->info_length = info_length;
2669 memcpy(apr_msg->info, info, info_length);
2670 }
2671
2672 if (private_data && private_data_len)
2673 memcpy(apr_msg->private_data, private_data, private_data_len);
2674 }
2675
2676 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2677 enum ib_cm_apr_status status,
2678 void *info,
2679 u8 info_length,
2680 const void *private_data,
2681 u8 private_data_len)
2682 {
2683 struct cm_id_private *cm_id_priv;
2684 struct ib_mad_send_buf *msg;
2685 unsigned long flags;
2686 int ret;
2687
2688 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2689 (info && info_length > IB_CM_APR_INFO_LENGTH))
2690 return -EINVAL;
2691
2692 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2693 spin_lock_irqsave(&cm_id_priv->lock, flags);
2694 if (cm_id->state != IB_CM_ESTABLISHED ||
2695 (cm_id->lap_state != IB_CM_LAP_RCVD &&
2696 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2697 ret = -EINVAL;
2698 goto out;
2699 }
2700
2701 ret = cm_alloc_msg(cm_id_priv, &msg);
2702 if (ret)
2703 goto out;
2704
2705 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2706 info, info_length, private_data, private_data_len);
2707 ret = ib_post_send_mad(msg, NULL);
2708 if (ret) {
2709 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2710 cm_free_msg(msg);
2711 return ret;
2712 }
2713
2714 cm_id->lap_state = IB_CM_LAP_IDLE;
2715 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2716 return ret;
2717 }
2718 EXPORT_SYMBOL(ib_send_cm_apr);
2719
2720 static int cm_apr_handler(struct cm_work *work)
2721 {
2722 struct cm_id_private *cm_id_priv;
2723 struct cm_apr_msg *apr_msg;
2724 int ret;
2725
2726 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2727 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2728 apr_msg->local_comm_id);
2729 if (!cm_id_priv)
2730 return -EINVAL; /* Unmatched reply. */
2731
2732 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2733 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2734 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2735 work->cm_event.private_data = &apr_msg->private_data;
2736
2737 spin_lock_irq(&cm_id_priv->lock);
2738 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2739 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2740 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2741 spin_unlock_irq(&cm_id_priv->lock);
2742 goto out;
2743 }
2744 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2745 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2746 cm_id_priv->msg = NULL;
2747
2748 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2749 if (!ret)
2750 list_add_tail(&work->list, &cm_id_priv->work_list);
2751 spin_unlock_irq(&cm_id_priv->lock);
2752
2753 if (ret)
2754 cm_process_work(cm_id_priv, work);
2755 else
2756 cm_deref_id(cm_id_priv);
2757 return 0;
2758 out:
2759 cm_deref_id(cm_id_priv);
2760 return -EINVAL;
2761 }
2762
2763 static int cm_timewait_handler(struct cm_work *work)
2764 {
2765 struct cm_timewait_info *timewait_info;
2766 struct cm_id_private *cm_id_priv;
2767 int ret;
2768
2769 timewait_info = (struct cm_timewait_info *)work;
2770 spin_lock_irq(&cm.lock);
2771 list_del(&timewait_info->list);
2772 spin_unlock_irq(&cm.lock);
2773
2774 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2775 timewait_info->work.remote_id);
2776 if (!cm_id_priv)
2777 return -EINVAL;
2778
2779 spin_lock_irq(&cm_id_priv->lock);
2780 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2781 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2782 spin_unlock_irq(&cm_id_priv->lock);
2783 goto out;
2784 }
2785 cm_id_priv->id.state = IB_CM_IDLE;
2786 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2787 if (!ret)
2788 list_add_tail(&work->list, &cm_id_priv->work_list);
2789 spin_unlock_irq(&cm_id_priv->lock);
2790
2791 if (ret)
2792 cm_process_work(cm_id_priv, work);
2793 else
2794 cm_deref_id(cm_id_priv);
2795 return 0;
2796 out:
2797 cm_deref_id(cm_id_priv);
2798 return -EINVAL;
2799 }
2800
2801 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2802 struct cm_id_private *cm_id_priv,
2803 struct ib_cm_sidr_req_param *param)
2804 {
2805 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2806 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2807 sidr_req_msg->request_id = cm_id_priv->id.local_id;
2808 sidr_req_msg->pkey = cpu_to_be16(param->path->pkey);
2809 sidr_req_msg->service_id = param->service_id;
2810
2811 if (param->private_data && param->private_data_len)
2812 memcpy(sidr_req_msg->private_data, param->private_data,
2813 param->private_data_len);
2814 }
2815
2816 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2817 struct ib_cm_sidr_req_param *param)
2818 {
2819 struct cm_id_private *cm_id_priv;
2820 struct ib_mad_send_buf *msg;
2821 unsigned long flags;
2822 int ret;
2823
2824 if (!param->path || (param->private_data &&
2825 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2826 return -EINVAL;
2827
2828 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2829 ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2830 if (ret)
2831 goto out;
2832
2833 cm_id->service_id = param->service_id;
2834 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
2835 cm_id_priv->timeout_ms = param->timeout_ms;
2836 cm_id_priv->max_cm_retries = param->max_cm_retries;
2837 ret = cm_alloc_msg(cm_id_priv, &msg);
2838 if (ret)
2839 goto out;
2840
2841 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2842 param);
2843 msg->timeout_ms = cm_id_priv->timeout_ms;
2844 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2845
2846 spin_lock_irqsave(&cm_id_priv->lock, flags);
2847 if (cm_id->state == IB_CM_IDLE)
2848 ret = ib_post_send_mad(msg, NULL);
2849 else
2850 ret = -EINVAL;
2851
2852 if (ret) {
2853 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2854 cm_free_msg(msg);
2855 goto out;
2856 }
2857 cm_id->state = IB_CM_SIDR_REQ_SENT;
2858 cm_id_priv->msg = msg;
2859 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2860 out:
2861 return ret;
2862 }
2863 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2864
2865 static void cm_format_sidr_req_event(struct cm_work *work,
2866 struct ib_cm_id *listen_id)
2867 {
2868 struct cm_sidr_req_msg *sidr_req_msg;
2869 struct ib_cm_sidr_req_event_param *param;
2870
2871 sidr_req_msg = (struct cm_sidr_req_msg *)
2872 work->mad_recv_wc->recv_buf.mad;
2873 param = &work->cm_event.param.sidr_req_rcvd;
2874 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2875 param->listen_id = listen_id;
2876 param->port = work->port->port_num;
2877 work->cm_event.private_data = &sidr_req_msg->private_data;
2878 }
2879
2880 static int cm_sidr_req_handler(struct cm_work *work)
2881 {
2882 struct ib_cm_id *cm_id;
2883 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2884 struct cm_sidr_req_msg *sidr_req_msg;
2885 struct ib_wc *wc;
2886
2887 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
2888 if (IS_ERR(cm_id))
2889 return PTR_ERR(cm_id);
2890 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2891
2892 /* Record SGID/SLID and request ID for lookup. */
2893 sidr_req_msg = (struct cm_sidr_req_msg *)
2894 work->mad_recv_wc->recv_buf.mad;
2895 wc = work->mad_recv_wc->wc;
2896 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2897 cm_id_priv->av.dgid.global.interface_id = 0;
2898 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2899 work->mad_recv_wc->recv_buf.grh,
2900 &cm_id_priv->av);
2901 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2902 cm_id_priv->tid = sidr_req_msg->hdr.tid;
2903 atomic_inc(&cm_id_priv->work_count);
2904
2905 spin_lock_irq(&cm.lock);
2906 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2907 if (cur_cm_id_priv) {
2908 spin_unlock_irq(&cm.lock);
2909 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2910 counter[CM_SIDR_REQ_COUNTER]);
2911 goto out; /* Duplicate message. */
2912 }
2913 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
2914 cur_cm_id_priv = cm_find_listen(cm_id->device,
2915 sidr_req_msg->service_id,
2916 sidr_req_msg->private_data);
2917 if (!cur_cm_id_priv) {
2918 spin_unlock_irq(&cm.lock);
2919 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED);
2920 goto out; /* No match. */
2921 }
2922 atomic_inc(&cur_cm_id_priv->refcount);
2923 spin_unlock_irq(&cm.lock);
2924
2925 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2926 cm_id_priv->id.context = cur_cm_id_priv->id.context;
2927 cm_id_priv->id.service_id = sidr_req_msg->service_id;
2928 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
2929
2930 cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2931 cm_process_work(cm_id_priv, work);
2932 cm_deref_id(cur_cm_id_priv);
2933 return 0;
2934 out:
2935 ib_destroy_cm_id(&cm_id_priv->id);
2936 return -EINVAL;
2937 }
2938
2939 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
2940 struct cm_id_private *cm_id_priv,
2941 struct ib_cm_sidr_rep_param *param)
2942 {
2943 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
2944 cm_id_priv->tid);
2945 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
2946 sidr_rep_msg->status = param->status;
2947 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
2948 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
2949 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
2950
2951 if (param->info && param->info_length)
2952 memcpy(sidr_rep_msg->info, param->info, param->info_length);
2953
2954 if (param->private_data && param->private_data_len)
2955 memcpy(sidr_rep_msg->private_data, param->private_data,
2956 param->private_data_len);
2957 }
2958
2959 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
2960 struct ib_cm_sidr_rep_param *param)
2961 {
2962 struct cm_id_private *cm_id_priv;
2963 struct ib_mad_send_buf *msg;
2964 unsigned long flags;
2965 int ret;
2966
2967 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
2968 (param->private_data &&
2969 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
2970 return -EINVAL;
2971
2972 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2973 spin_lock_irqsave(&cm_id_priv->lock, flags);
2974 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
2975 ret = -EINVAL;
2976 goto error;
2977 }
2978
2979 ret = cm_alloc_msg(cm_id_priv, &msg);
2980 if (ret)
2981 goto error;
2982
2983 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
2984 param);
2985 ret = ib_post_send_mad(msg, NULL);
2986 if (ret) {
2987 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2988 cm_free_msg(msg);
2989 return ret;
2990 }
2991 cm_id->state = IB_CM_IDLE;
2992 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2993
2994 spin_lock_irqsave(&cm.lock, flags);
2995 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2996 spin_unlock_irqrestore(&cm.lock, flags);
2997 return 0;
2998
2999 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3000 return ret;
3001 }
3002 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3003
3004 static void cm_format_sidr_rep_event(struct cm_work *work)
3005 {
3006 struct cm_sidr_rep_msg *sidr_rep_msg;
3007 struct ib_cm_sidr_rep_event_param *param;
3008
3009 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3010 work->mad_recv_wc->recv_buf.mad;
3011 param = &work->cm_event.param.sidr_rep_rcvd;
3012 param->status = sidr_rep_msg->status;
3013 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
3014 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
3015 param->info = &sidr_rep_msg->info;
3016 param->info_len = sidr_rep_msg->info_length;
3017 work->cm_event.private_data = &sidr_rep_msg->private_data;
3018 }
3019
3020 static int cm_sidr_rep_handler(struct cm_work *work)
3021 {
3022 struct cm_sidr_rep_msg *sidr_rep_msg;
3023 struct cm_id_private *cm_id_priv;
3024
3025 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3026 work->mad_recv_wc->recv_buf.mad;
3027 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
3028 if (!cm_id_priv)
3029 return -EINVAL; /* Unmatched reply. */
3030
3031 spin_lock_irq(&cm_id_priv->lock);
3032 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3033 spin_unlock_irq(&cm_id_priv->lock);
3034 goto out;
3035 }
3036 cm_id_priv->id.state = IB_CM_IDLE;
3037 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3038 spin_unlock_irq(&cm_id_priv->lock);
3039
3040 cm_format_sidr_rep_event(work);
3041 cm_process_work(cm_id_priv, work);
3042 return 0;
3043 out:
3044 cm_deref_id(cm_id_priv);
3045 return -EINVAL;
3046 }
3047
3048 static void cm_process_send_error(struct ib_mad_send_buf *msg,
3049 enum ib_wc_status wc_status)
3050 {
3051 struct cm_id_private *cm_id_priv;
3052 struct ib_cm_event cm_event;
3053 enum ib_cm_state state;
3054 int ret;
3055
3056 memset(&cm_event, 0, sizeof cm_event);
3057 cm_id_priv = msg->context[0];
3058
3059 /* Discard old sends or ones without a response. */
3060 spin_lock_irq(&cm_id_priv->lock);
3061 state = (enum ib_cm_state) (unsigned long) msg->context[1];
3062 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3063 goto discard;
3064
3065 switch (state) {
3066 case IB_CM_REQ_SENT:
3067 case IB_CM_MRA_REQ_RCVD:
3068 cm_reset_to_idle(cm_id_priv);
3069 cm_event.event = IB_CM_REQ_ERROR;
3070 break;
3071 case IB_CM_REP_SENT:
3072 case IB_CM_MRA_REP_RCVD:
3073 cm_reset_to_idle(cm_id_priv);
3074 cm_event.event = IB_CM_REP_ERROR;
3075 break;
3076 case IB_CM_DREQ_SENT:
3077 cm_enter_timewait(cm_id_priv);
3078 cm_event.event = IB_CM_DREQ_ERROR;
3079 break;
3080 case IB_CM_SIDR_REQ_SENT:
3081 cm_id_priv->id.state = IB_CM_IDLE;
3082 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3083 break;
3084 default:
3085 goto discard;
3086 }
3087 spin_unlock_irq(&cm_id_priv->lock);
3088 cm_event.param.send_status = wc_status;
3089
3090 /* No other events can occur on the cm_id at this point. */
3091 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3092 cm_free_msg(msg);
3093 if (ret)
3094 ib_destroy_cm_id(&cm_id_priv->id);
3095 return;
3096 discard:
3097 spin_unlock_irq(&cm_id_priv->lock);
3098 cm_free_msg(msg);
3099 }
3100
3101 static void cm_send_handler(struct ib_mad_agent *mad_agent,
3102 struct ib_mad_send_wc *mad_send_wc)
3103 {
3104 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3105 struct cm_port *port;
3106 u16 attr_index;
3107
3108 port = mad_agent->context;
3109 attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3110 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3111
3112 /*
3113 * If the send was in response to a received message (context[0] is not
3114 * set to a cm_id), and is not a REJ, then it is a send that was
3115 * manually retried.
3116 */
3117 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3118 msg->retries = 1;
3119
3120 atomic_long_add(1 + msg->retries,
3121 &port->counter_group[CM_XMIT].counter[attr_index]);
3122 if (msg->retries)
3123 atomic_long_add(msg->retries,
3124 &port->counter_group[CM_XMIT_RETRIES].
3125 counter[attr_index]);
3126
3127 switch (mad_send_wc->status) {
3128 case IB_WC_SUCCESS:
3129 case IB_WC_WR_FLUSH_ERR:
3130 cm_free_msg(msg);
3131 break;
3132 default:
3133 if (msg->context[0] && msg->context[1])
3134 cm_process_send_error(msg, mad_send_wc->status);
3135 else
3136 cm_free_msg(msg);
3137 break;
3138 }
3139 }
3140
3141 static void cm_work_handler(struct work_struct *_work)
3142 {
3143 struct cm_work *work = container_of(_work, struct cm_work, work.work);
3144 int ret;
3145
3146 switch (work->cm_event.event) {
3147 case IB_CM_REQ_RECEIVED:
3148 ret = cm_req_handler(work);
3149 break;
3150 case IB_CM_MRA_RECEIVED:
3151 ret = cm_mra_handler(work);
3152 break;
3153 case IB_CM_REJ_RECEIVED:
3154 ret = cm_rej_handler(work);
3155 break;
3156 case IB_CM_REP_RECEIVED:
3157 ret = cm_rep_handler(work);
3158 break;
3159 case IB_CM_RTU_RECEIVED:
3160 ret = cm_rtu_handler(work);
3161 break;
3162 case IB_CM_USER_ESTABLISHED:
3163 ret = cm_establish_handler(work);
3164 break;
3165 case IB_CM_DREQ_RECEIVED:
3166 ret = cm_dreq_handler(work);
3167 break;
3168 case IB_CM_DREP_RECEIVED:
3169 ret = cm_drep_handler(work);
3170 break;
3171 case IB_CM_SIDR_REQ_RECEIVED:
3172 ret = cm_sidr_req_handler(work);
3173 break;
3174 case IB_CM_SIDR_REP_RECEIVED:
3175 ret = cm_sidr_rep_handler(work);
3176 break;
3177 case IB_CM_LAP_RECEIVED:
3178 ret = cm_lap_handler(work);
3179 break;
3180 case IB_CM_APR_RECEIVED:
3181 ret = cm_apr_handler(work);
3182 break;
3183 case IB_CM_TIMEWAIT_EXIT:
3184 ret = cm_timewait_handler(work);
3185 break;
3186 default:
3187 ret = -EINVAL;
3188 break;
3189 }
3190 if (ret)
3191 cm_free_work(work);
3192 }
3193
3194 static int cm_establish(struct ib_cm_id *cm_id)
3195 {
3196 struct cm_id_private *cm_id_priv;
3197 struct cm_work *work;
3198 unsigned long flags;
3199 int ret = 0;
3200
3201 work = kmalloc(sizeof *work, GFP_ATOMIC);
3202 if (!work)
3203 return -ENOMEM;
3204
3205 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3206 spin_lock_irqsave(&cm_id_priv->lock, flags);
3207 switch (cm_id->state)
3208 {
3209 case IB_CM_REP_SENT:
3210 case IB_CM_MRA_REP_RCVD:
3211 cm_id->state = IB_CM_ESTABLISHED;
3212 break;
3213 case IB_CM_ESTABLISHED:
3214 ret = -EISCONN;
3215 break;
3216 default:
3217 ret = -EINVAL;
3218 break;
3219 }
3220 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3221
3222 if (ret) {
3223 kfree(work);
3224 goto out;
3225 }
3226
3227 /*
3228 * The CM worker thread may try to destroy the cm_id before it
3229 * can execute this work item. To prevent potential deadlock,
3230 * we need to find the cm_id once we're in the context of the
3231 * worker thread, rather than holding a reference on it.
3232 */
3233 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3234 work->local_id = cm_id->local_id;
3235 work->remote_id = cm_id->remote_id;
3236 work->mad_recv_wc = NULL;
3237 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3238 queue_delayed_work(cm.wq, &work->work, 0);
3239 out:
3240 return ret;
3241 }
3242
3243 static int cm_migrate(struct ib_cm_id *cm_id)
3244 {
3245 struct cm_id_private *cm_id_priv;
3246 unsigned long flags;
3247 int ret = 0;
3248
3249 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3250 spin_lock_irqsave(&cm_id_priv->lock, flags);
3251 if (cm_id->state == IB_CM_ESTABLISHED &&
3252 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3253 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3254 cm_id->lap_state = IB_CM_LAP_IDLE;
3255 cm_id_priv->av = cm_id_priv->alt_av;
3256 } else
3257 ret = -EINVAL;
3258 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3259
3260 return ret;
3261 }
3262
3263 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3264 {
3265 int ret;
3266
3267 switch (event) {
3268 case IB_EVENT_COMM_EST:
3269 ret = cm_establish(cm_id);
3270 break;
3271 case IB_EVENT_PATH_MIG:
3272 ret = cm_migrate(cm_id);
3273 break;
3274 default:
3275 ret = -EINVAL;
3276 }
3277 return ret;
3278 }
3279 EXPORT_SYMBOL(ib_cm_notify);
3280
3281 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3282 struct ib_mad_recv_wc *mad_recv_wc)
3283 {
3284 struct cm_port *port = mad_agent->context;
3285 struct cm_work *work;
3286 enum ib_cm_event_type event;
3287 u16 attr_id;
3288 int paths = 0;
3289
3290 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3291 case CM_REQ_ATTR_ID:
3292 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3293 alt_local_lid != 0);
3294 event = IB_CM_REQ_RECEIVED;
3295 break;
3296 case CM_MRA_ATTR_ID:
3297 event = IB_CM_MRA_RECEIVED;
3298 break;
3299 case CM_REJ_ATTR_ID:
3300 event = IB_CM_REJ_RECEIVED;
3301 break;
3302 case CM_REP_ATTR_ID:
3303 event = IB_CM_REP_RECEIVED;
3304 break;
3305 case CM_RTU_ATTR_ID:
3306 event = IB_CM_RTU_RECEIVED;
3307 break;
3308 case CM_DREQ_ATTR_ID:
3309 event = IB_CM_DREQ_RECEIVED;
3310 break;
3311 case CM_DREP_ATTR_ID:
3312 event = IB_CM_DREP_RECEIVED;
3313 break;
3314 case CM_SIDR_REQ_ATTR_ID:
3315 event = IB_CM_SIDR_REQ_RECEIVED;
3316 break;
3317 case CM_SIDR_REP_ATTR_ID:
3318 event = IB_CM_SIDR_REP_RECEIVED;
3319 break;
3320 case CM_LAP_ATTR_ID:
3321 paths = 1;
3322 event = IB_CM_LAP_RECEIVED;
3323 break;
3324 case CM_APR_ATTR_ID:
3325 event = IB_CM_APR_RECEIVED;
3326 break;
3327 default:
3328 ib_free_recv_mad(mad_recv_wc);
3329 return;
3330 }
3331
3332 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
3333 atomic_long_inc(&port->counter_group[CM_RECV].
3334 counter[attr_id - CM_ATTR_ID_OFFSET]);
3335
3336 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3337 GFP_KERNEL);
3338 if (!work) {
3339 ib_free_recv_mad(mad_recv_wc);
3340 return;
3341 }
3342
3343 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3344 work->cm_event.event = event;
3345 work->mad_recv_wc = mad_recv_wc;
3346 work->port = port;
3347 queue_delayed_work(cm.wq, &work->work, 0);
3348 }
3349
3350 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3351 struct ib_qp_attr *qp_attr,
3352 int *qp_attr_mask)
3353 {
3354 unsigned long flags;
3355 int ret;
3356
3357 spin_lock_irqsave(&cm_id_priv->lock, flags);
3358 switch (cm_id_priv->id.state) {
3359 case IB_CM_REQ_SENT:
3360 case IB_CM_MRA_REQ_RCVD:
3361 case IB_CM_REQ_RCVD:
3362 case IB_CM_MRA_REQ_SENT:
3363 case IB_CM_REP_RCVD:
3364 case IB_CM_MRA_REP_SENT:
3365 case IB_CM_REP_SENT:
3366 case IB_CM_MRA_REP_RCVD:
3367 case IB_CM_ESTABLISHED:
3368 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3369 IB_QP_PKEY_INDEX | IB_QP_PORT;
3370 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
3371 if (cm_id_priv->responder_resources)
3372 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3373 IB_ACCESS_REMOTE_ATOMIC;
3374 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3375 qp_attr->port_num = cm_id_priv->av.port->port_num;
3376 ret = 0;
3377 break;
3378 default:
3379 ret = -EINVAL;
3380 break;
3381 }
3382 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3383 return ret;
3384 }
3385
3386 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3387 struct ib_qp_attr *qp_attr,
3388 int *qp_attr_mask)
3389 {
3390 unsigned long flags;
3391 int ret;
3392
3393 spin_lock_irqsave(&cm_id_priv->lock, flags);
3394 switch (cm_id_priv->id.state) {
3395 case IB_CM_REQ_RCVD:
3396 case IB_CM_MRA_REQ_SENT:
3397 case IB_CM_REP_RCVD:
3398 case IB_CM_MRA_REP_SENT:
3399 case IB_CM_REP_SENT:
3400 case IB_CM_MRA_REP_RCVD:
3401 case IB_CM_ESTABLISHED:
3402 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3403 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3404 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3405 qp_attr->path_mtu = cm_id_priv->path_mtu;
3406 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3407 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3408 if (cm_id_priv->qp_type == IB_QPT_RC) {
3409 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3410 IB_QP_MIN_RNR_TIMER;
3411 qp_attr->max_dest_rd_atomic =
3412 cm_id_priv->responder_resources;
3413 qp_attr->min_rnr_timer = 0;
3414 }
3415 if (cm_id_priv->alt_av.ah_attr.dlid) {
3416 *qp_attr_mask |= IB_QP_ALT_PATH;
3417 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3418 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3419 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3420 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3421 }
3422 ret = 0;
3423 break;
3424 default:
3425 ret = -EINVAL;
3426 break;
3427 }
3428 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3429 return ret;
3430 }
3431
3432 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3433 struct ib_qp_attr *qp_attr,
3434 int *qp_attr_mask)
3435 {
3436 unsigned long flags;
3437 int ret;
3438
3439 spin_lock_irqsave(&cm_id_priv->lock, flags);
3440 switch (cm_id_priv->id.state) {
3441 /* Allow transition to RTS before sending REP */
3442 case IB_CM_REQ_RCVD:
3443 case IB_CM_MRA_REQ_SENT:
3444
3445 case IB_CM_REP_RCVD:
3446 case IB_CM_MRA_REP_SENT:
3447 case IB_CM_REP_SENT:
3448 case IB_CM_MRA_REP_RCVD:
3449 case IB_CM_ESTABLISHED:
3450 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
3451 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3452 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3453 if (cm_id_priv->qp_type == IB_QPT_RC) {
3454 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3455 IB_QP_RNR_RETRY |
3456 IB_QP_MAX_QP_RD_ATOMIC;
3457 qp_attr->timeout = cm_id_priv->av.timeout;
3458 qp_attr->retry_cnt = cm_id_priv->retry_count;
3459 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3460 qp_attr->max_rd_atomic =
3461 cm_id_priv->initiator_depth;
3462 }
3463 if (cm_id_priv->alt_av.ah_attr.dlid) {
3464 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3465 qp_attr->path_mig_state = IB_MIG_REARM;
3466 }
3467 } else {
3468 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
3469 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3470 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3471 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3472 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3473 qp_attr->path_mig_state = IB_MIG_REARM;
3474 }
3475 ret = 0;
3476 break;
3477 default:
3478 ret = -EINVAL;
3479 break;
3480 }
3481 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3482 return ret;
3483 }
3484
3485 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3486 struct ib_qp_attr *qp_attr,
3487 int *qp_attr_mask)
3488 {
3489 struct cm_id_private *cm_id_priv;
3490 int ret;
3491
3492 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3493 switch (qp_attr->qp_state) {
3494 case IB_QPS_INIT:
3495 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3496 break;
3497 case IB_QPS_RTR:
3498 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3499 break;
3500 case IB_QPS_RTS:
3501 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3502 break;
3503 default:
3504 ret = -EINVAL;
3505 break;
3506 }
3507 return ret;
3508 }
3509 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3510
3511 static void cm_get_ack_delay(struct cm_device *cm_dev)
3512 {
3513 struct ib_device_attr attr;
3514
3515 if (ib_query_device(cm_dev->device, &attr))
3516 cm_dev->ack_delay = 0; /* acks will rely on packet life time */
3517 else
3518 cm_dev->ack_delay = attr.local_ca_ack_delay;
3519 }
3520
3521 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
3522 char *buf)
3523 {
3524 struct cm_counter_group *group;
3525 struct cm_counter_attribute *cm_attr;
3526
3527 group = container_of(obj, struct cm_counter_group, obj);
3528 cm_attr = container_of(attr, struct cm_counter_attribute, attr);
3529
3530 return sprintf(buf, "%ld\n",
3531 atomic_long_read(&group->counter[cm_attr->index]));
3532 }
3533
3534 static struct sysfs_ops cm_counter_ops = {
3535 .show = cm_show_counter
3536 };
3537
3538 static struct kobj_type cm_counter_obj_type = {
3539 .sysfs_ops = &cm_counter_ops,
3540 .default_attrs = cm_counter_default_attrs
3541 };
3542
3543 static void cm_release_port_obj(struct kobject *obj)
3544 {
3545 struct cm_port *cm_port;
3546
3547 printk(KERN_ERR "free cm port\n");
3548
3549 cm_port = container_of(obj, struct cm_port, port_obj);
3550 kfree(cm_port);
3551 }
3552
3553 static struct kobj_type cm_port_obj_type = {
3554 .release = cm_release_port_obj
3555 };
3556
3557 static void cm_release_dev_obj(struct kobject *obj)
3558 {
3559 struct cm_device *cm_dev;
3560
3561 printk(KERN_ERR "free cm dev\n");
3562
3563 cm_dev = container_of(obj, struct cm_device, dev_obj);
3564 kfree(cm_dev);
3565 }
3566
3567 static struct kobj_type cm_dev_obj_type = {
3568 .release = cm_release_dev_obj
3569 };
3570
3571 struct class cm_class = {
3572 .name = "infiniband_cm",
3573 };
3574 EXPORT_SYMBOL(cm_class);
3575
3576 static void cm_remove_fs_obj(struct kobject *obj)
3577 {
3578 kobject_put(obj->parent);
3579 kobject_put(obj);
3580 }
3581
3582 static int cm_create_port_fs(struct cm_port *port)
3583 {
3584 int i, ret;
3585
3586 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type,
3587 kobject_get(&port->cm_dev->dev_obj),
3588 "%d", port->port_num);
3589 if (ret) {
3590 kfree(port);
3591 return ret;
3592 }
3593
3594 for (i = 0; i < CM_COUNTER_GROUPS; i++) {
3595 ret = kobject_init_and_add(&port->counter_group[i].obj,
3596 &cm_counter_obj_type,
3597 kobject_get(&port->port_obj),
3598 "%s", counter_group_names[i]);
3599 if (ret)
3600 goto error;
3601 }
3602
3603 return 0;
3604
3605 error:
3606 while (i--)
3607 cm_remove_fs_obj(&port->counter_group[i].obj);
3608 cm_remove_fs_obj(&port->port_obj);
3609 return ret;
3610
3611 }
3612
3613 static void cm_remove_port_fs(struct cm_port *port)
3614 {
3615 int i;
3616
3617 for (i = 0; i < CM_COUNTER_GROUPS; i++)
3618 cm_remove_fs_obj(&port->counter_group[i].obj);
3619
3620 cm_remove_fs_obj(&port->port_obj);
3621 }
3622
3623 static void cm_add_one(struct ib_device *device)
3624 {
3625 struct cm_device *cm_dev;
3626 struct cm_port *port;
3627 struct ib_mad_reg_req reg_req = {
3628 .mgmt_class = IB_MGMT_CLASS_CM,
3629 .mgmt_class_version = IB_CM_CLASS_VERSION
3630 };
3631 struct ib_port_modify port_modify = {
3632 .set_port_cap_mask = IB_PORT_CM_SUP
3633 };
3634 unsigned long flags;
3635 int ret;
3636 u8 i;
3637
3638 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
3639 return;
3640
3641 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) *
3642 device->phys_port_cnt, GFP_KERNEL);
3643 if (!cm_dev)
3644 return;
3645
3646 cm_dev->device = device;
3647 cm_get_ack_delay(cm_dev);
3648
3649 ret = kobject_init_and_add(&cm_dev->dev_obj, &cm_dev_obj_type,
3650 &cm_class.subsys.kobj, "%s", device->name);
3651 if (ret) {
3652 kfree(cm_dev);
3653 return;
3654 }
3655
3656 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3657 for (i = 1; i <= device->phys_port_cnt; i++) {
3658 port = kzalloc(sizeof *port, GFP_KERNEL);
3659 if (!port)
3660 goto error1;
3661
3662 cm_dev->port[i-1] = port;
3663 port->cm_dev = cm_dev;
3664 port->port_num = i;
3665
3666 ret = cm_create_port_fs(port);
3667 if (ret)
3668 goto error1;
3669
3670 port->mad_agent = ib_register_mad_agent(device, i,
3671 IB_QPT_GSI,
3672 &reg_req,
3673 0,
3674 cm_send_handler,
3675 cm_recv_handler,
3676 port);
3677 if (IS_ERR(port->mad_agent))
3678 goto error2;
3679
3680 ret = ib_modify_port(device, i, 0, &port_modify);
3681 if (ret)
3682 goto error3;
3683 }
3684 ib_set_client_data(device, &cm_client, cm_dev);
3685
3686 write_lock_irqsave(&cm.device_lock, flags);
3687 list_add_tail(&cm_dev->list, &cm.device_list);
3688 write_unlock_irqrestore(&cm.device_lock, flags);
3689 return;
3690
3691 error3:
3692 ib_unregister_mad_agent(port->mad_agent);
3693 error2:
3694 cm_remove_port_fs(port);
3695 error1:
3696 port_modify.set_port_cap_mask = 0;
3697 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3698 while (--i) {
3699 port = cm_dev->port[i-1];
3700 ib_modify_port(device, port->port_num, 0, &port_modify);
3701 ib_unregister_mad_agent(port->mad_agent);
3702 cm_remove_port_fs(port);
3703 }
3704 cm_remove_fs_obj(&cm_dev->dev_obj);
3705 }
3706
3707 static void cm_remove_one(struct ib_device *device)
3708 {
3709 struct cm_device *cm_dev;
3710 struct cm_port *port;
3711 struct ib_port_modify port_modify = {
3712 .clr_port_cap_mask = IB_PORT_CM_SUP
3713 };
3714 unsigned long flags;
3715 int i;
3716
3717 cm_dev = ib_get_client_data(device, &cm_client);
3718 if (!cm_dev)
3719 return;
3720
3721 write_lock_irqsave(&cm.device_lock, flags);
3722 list_del(&cm_dev->list);
3723 write_unlock_irqrestore(&cm.device_lock, flags);
3724
3725 for (i = 1; i <= device->phys_port_cnt; i++) {
3726 port = cm_dev->port[i-1];
3727 ib_modify_port(device, port->port_num, 0, &port_modify);
3728 ib_unregister_mad_agent(port->mad_agent);
3729 cm_remove_port_fs(port);
3730 }
3731 cm_remove_fs_obj(&cm_dev->dev_obj);
3732 }
3733
3734 static int __init ib_cm_init(void)
3735 {
3736 int ret;
3737
3738 memset(&cm, 0, sizeof cm);
3739 INIT_LIST_HEAD(&cm.device_list);
3740 rwlock_init(&cm.device_lock);
3741 spin_lock_init(&cm.lock);
3742 cm.listen_service_table = RB_ROOT;
3743 cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3744 cm.remote_id_table = RB_ROOT;
3745 cm.remote_qp_table = RB_ROOT;
3746 cm.remote_sidr_table = RB_ROOT;
3747 idr_init(&cm.local_id_table);
3748 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3749 idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3750 INIT_LIST_HEAD(&cm.timewait_list);
3751
3752 ret = class_register(&cm_class);
3753 if (ret)
3754 return -ENOMEM;
3755
3756 cm.wq = create_workqueue("ib_cm");
3757 if (!cm.wq) {
3758 ret = -ENOMEM;
3759 goto error1;
3760 }
3761
3762 ret = ib_register_client(&cm_client);
3763 if (ret)
3764 goto error2;
3765
3766 return 0;
3767 error2:
3768 destroy_workqueue(cm.wq);
3769 error1:
3770 class_unregister(&cm_class);
3771 return ret;
3772 }
3773
3774 static void __exit ib_cm_cleanup(void)
3775 {
3776 struct cm_timewait_info *timewait_info, *tmp;
3777
3778 spin_lock_irq(&cm.lock);
3779 list_for_each_entry(timewait_info, &cm.timewait_list, list)
3780 cancel_delayed_work(&timewait_info->work.work);
3781 spin_unlock_irq(&cm.lock);
3782
3783 destroy_workqueue(cm.wq);
3784
3785 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
3786 list_del(&timewait_info->list);
3787 kfree(timewait_info);
3788 }
3789
3790 ib_unregister_client(&cm_client);
3791 class_unregister(&cm_class);
3792 idr_destroy(&cm.local_id_table);
3793 }
3794
3795 module_init(ib_cm_init);
3796 module_exit(ib_cm_cleanup);
3797
WRT350N Kernel Patches