Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband
[linux-2.6.git] / drivers / infiniband / core / cm.c
1 /*
2  * Copyright (c) 2004-2006 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/err.h>
41 #include <linux/idr.h>
42 #include <linux/interrupt.h>
43 #include <linux/pci.h>
44 #include <linux/random.h>
45 #include <linux/rbtree.h>
46 #include <linux/spinlock.h>
47 #include <linux/workqueue.h>
48
49 #include <rdma/ib_cache.h>
50 #include <rdma/ib_cm.h>
51 #include "cm_msgs.h"
52
53 MODULE_AUTHOR("Sean Hefty");
54 MODULE_DESCRIPTION("InfiniBand CM");
55 MODULE_LICENSE("Dual BSD/GPL");
56
57 static void cm_add_one(struct ib_device *device);
58 static void cm_remove_one(struct ib_device *device);
59
60 static struct ib_client cm_client = {
61         .name   = "cm",
62         .add    = cm_add_one,
63         .remove = cm_remove_one
64 };
65
66 static struct ib_cm {
67         spinlock_t lock;
68         struct list_head device_list;
69         rwlock_t device_lock;
70         struct rb_root listen_service_table;
71         u64 listen_service_id;
72         /* struct rb_root peer_service_table; todo: fix peer to peer */
73         struct rb_root remote_qp_table;
74         struct rb_root remote_id_table;
75         struct rb_root remote_sidr_table;
76         struct idr local_id_table;
77         __be32 random_id_operand;
78         struct list_head timewait_list;
79         struct workqueue_struct *wq;
80 } cm;
81
82 struct cm_port {
83         struct cm_device *cm_dev;
84         struct ib_mad_agent *mad_agent;
85         u8 port_num;
86 };
87
88 struct cm_device {
89         struct list_head list;
90         struct ib_device *device;
91         struct cm_port port[0];
92 };
93
94 struct cm_av {
95         struct cm_port *port;
96         union ib_gid dgid;
97         struct ib_ah_attr ah_attr;
98         u16 pkey_index;
99         u8 packet_life_time;
100 };
101
102 struct cm_work {
103         struct delayed_work work;
104         struct list_head list;
105         struct cm_port *port;
106         struct ib_mad_recv_wc *mad_recv_wc;     /* Received MADs */
107         __be32 local_id;                        /* Established / timewait */
108         __be32 remote_id;
109         struct ib_cm_event cm_event;
110         struct ib_sa_path_rec path[0];
111 };
112
113 struct cm_timewait_info {
114         struct cm_work work;                    /* Must be first. */
115         struct list_head list;
116         struct rb_node remote_qp_node;
117         struct rb_node remote_id_node;
118         __be64 remote_ca_guid;
119         __be32 remote_qpn;
120         u8 inserted_remote_qp;
121         u8 inserted_remote_id;
122 };
123
124 struct cm_id_private {
125         struct ib_cm_id id;
126
127         struct rb_node service_node;
128         struct rb_node sidr_id_node;
129         spinlock_t lock;        /* Do not acquire inside cm.lock */
130         struct completion comp;
131         atomic_t refcount;
132
133         struct ib_mad_send_buf *msg;
134         struct cm_timewait_info *timewait_info;
135         /* todo: use alternate port on send failure */
136         struct cm_av av;
137         struct cm_av alt_av;
138         struct ib_cm_compare_data *compare_data;
139
140         void *private_data;
141         __be64 tid;
142         __be32 local_qpn;
143         __be32 remote_qpn;
144         enum ib_qp_type qp_type;
145         __be32 sq_psn;
146         __be32 rq_psn;
147         int timeout_ms;
148         enum ib_mtu path_mtu;
149         __be16 pkey;
150         u8 private_data_len;
151         u8 max_cm_retries;
152         u8 peer_to_peer;
153         u8 responder_resources;
154         u8 initiator_depth;
155         u8 retry_count;
156         u8 rnr_retry_count;
157         u8 service_timeout;
158
159         struct list_head work_list;
160         atomic_t work_count;
161 };
162
163 static void cm_work_handler(struct work_struct *work);
164
165 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
166 {
167         if (atomic_dec_and_test(&cm_id_priv->refcount))
168                 complete(&cm_id_priv->comp);
169 }
170
171 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
172                         struct ib_mad_send_buf **msg)
173 {
174         struct ib_mad_agent *mad_agent;
175         struct ib_mad_send_buf *m;
176         struct ib_ah *ah;
177
178         mad_agent = cm_id_priv->av.port->mad_agent;
179         ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
180         if (IS_ERR(ah))
181                 return PTR_ERR(ah);
182
183         m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
184                                cm_id_priv->av.pkey_index,
185                                0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
186                                GFP_ATOMIC);
187         if (IS_ERR(m)) {
188                 ib_destroy_ah(ah);
189                 return PTR_ERR(m);
190         }
191
192         /* Timeout set by caller if response is expected. */
193         m->ah = ah;
194         m->retries = cm_id_priv->max_cm_retries;
195
196         atomic_inc(&cm_id_priv->refcount);
197         m->context[0] = cm_id_priv;
198         *msg = m;
199         return 0;
200 }
201
202 static int cm_alloc_response_msg(struct cm_port *port,
203                                  struct ib_mad_recv_wc *mad_recv_wc,
204                                  struct ib_mad_send_buf **msg)
205 {
206         struct ib_mad_send_buf *m;
207         struct ib_ah *ah;
208
209         ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
210                                   mad_recv_wc->recv_buf.grh, port->port_num);
211         if (IS_ERR(ah))
212                 return PTR_ERR(ah);
213
214         m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
215                                0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
216                                GFP_ATOMIC);
217         if (IS_ERR(m)) {
218                 ib_destroy_ah(ah);
219                 return PTR_ERR(m);
220         }
221         m->ah = ah;
222         *msg = m;
223         return 0;
224 }
225
226 static void cm_free_msg(struct ib_mad_send_buf *msg)
227 {
228         ib_destroy_ah(msg->ah);
229         if (msg->context[0])
230                 cm_deref_id(msg->context[0]);
231         ib_free_send_mad(msg);
232 }
233
234 static void * cm_copy_private_data(const void *private_data,
235                                    u8 private_data_len)
236 {
237         void *data;
238
239         if (!private_data || !private_data_len)
240                 return NULL;
241
242         data = kmemdup(private_data, private_data_len, GFP_KERNEL);
243         if (!data)
244                 return ERR_PTR(-ENOMEM);
245
246         return data;
247 }
248
249 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
250                                  void *private_data, u8 private_data_len)
251 {
252         if (cm_id_priv->private_data && cm_id_priv->private_data_len)
253                 kfree(cm_id_priv->private_data);
254
255         cm_id_priv->private_data = private_data;
256         cm_id_priv->private_data_len = private_data_len;
257 }
258
259 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
260                                     struct ib_grh *grh, struct cm_av *av)
261 {
262         av->port = port;
263         av->pkey_index = wc->pkey_index;
264         ib_init_ah_from_wc(port->cm_dev->device, port->port_num, wc,
265                            grh, &av->ah_attr);
266 }
267
268 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
269 {
270         struct cm_device *cm_dev;
271         struct cm_port *port = NULL;
272         unsigned long flags;
273         int ret;
274         u8 p;
275
276         read_lock_irqsave(&cm.device_lock, flags);
277         list_for_each_entry(cm_dev, &cm.device_list, list) {
278                 if (!ib_find_cached_gid(cm_dev->device, &path->sgid,
279                                         &p, NULL)) {
280                         port = &cm_dev->port[p-1];
281                         break;
282                 }
283         }
284         read_unlock_irqrestore(&cm.device_lock, flags);
285
286         if (!port)
287                 return -EINVAL;
288
289         ret = ib_find_cached_pkey(cm_dev->device, port->port_num,
290                                   be16_to_cpu(path->pkey), &av->pkey_index);
291         if (ret)
292                 return ret;
293
294         av->port = port;
295         ib_init_ah_from_path(cm_dev->device, port->port_num, path,
296                              &av->ah_attr);
297         av->packet_life_time = path->packet_life_time;
298         return 0;
299 }
300
301 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
302 {
303         unsigned long flags;
304         int ret, id;
305         static int next_id;
306
307         do {
308                 spin_lock_irqsave(&cm.lock, flags);
309                 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv,
310                                         next_id++, &id);
311                 spin_unlock_irqrestore(&cm.lock, flags);
312         } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
313
314         cm_id_priv->id.local_id = (__force __be32) (id ^ cm.random_id_operand);
315         return ret;
316 }
317
318 static void cm_free_id(__be32 local_id)
319 {
320         unsigned long flags;
321
322         spin_lock_irqsave(&cm.lock, flags);
323         idr_remove(&cm.local_id_table,
324                    (__force int) (local_id ^ cm.random_id_operand));
325         spin_unlock_irqrestore(&cm.lock, flags);
326 }
327
328 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
329 {
330         struct cm_id_private *cm_id_priv;
331
332         cm_id_priv = idr_find(&cm.local_id_table,
333                               (__force int) (local_id ^ cm.random_id_operand));
334         if (cm_id_priv) {
335                 if (cm_id_priv->id.remote_id == remote_id)
336                         atomic_inc(&cm_id_priv->refcount);
337                 else
338                         cm_id_priv = NULL;
339         }
340
341         return cm_id_priv;
342 }
343
344 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
345 {
346         struct cm_id_private *cm_id_priv;
347         unsigned long flags;
348
349         spin_lock_irqsave(&cm.lock, flags);
350         cm_id_priv = cm_get_id(local_id, remote_id);
351         spin_unlock_irqrestore(&cm.lock, flags);
352
353         return cm_id_priv;
354 }
355
356 static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
357 {
358         int i;
359
360         for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
361                 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
362                                              ((unsigned long *) mask)[i];
363 }
364
365 static int cm_compare_data(struct ib_cm_compare_data *src_data,
366                            struct ib_cm_compare_data *dst_data)
367 {
368         u8 src[IB_CM_COMPARE_SIZE];
369         u8 dst[IB_CM_COMPARE_SIZE];
370
371         if (!src_data || !dst_data)
372                 return 0;
373
374         cm_mask_copy(src, src_data->data, dst_data->mask);
375         cm_mask_copy(dst, dst_data->data, src_data->mask);
376         return memcmp(src, dst, IB_CM_COMPARE_SIZE);
377 }
378
379 static int cm_compare_private_data(u8 *private_data,
380                                    struct ib_cm_compare_data *dst_data)
381 {
382         u8 src[IB_CM_COMPARE_SIZE];
383
384         if (!dst_data)
385                 return 0;
386
387         cm_mask_copy(src, private_data, dst_data->mask);
388         return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
389 }
390
391 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
392 {
393         struct rb_node **link = &cm.listen_service_table.rb_node;
394         struct rb_node *parent = NULL;
395         struct cm_id_private *cur_cm_id_priv;
396         __be64 service_id = cm_id_priv->id.service_id;
397         __be64 service_mask = cm_id_priv->id.service_mask;
398         int data_cmp;
399
400         while (*link) {
401                 parent = *link;
402                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
403                                           service_node);
404                 data_cmp = cm_compare_data(cm_id_priv->compare_data,
405                                            cur_cm_id_priv->compare_data);
406                 if ((cur_cm_id_priv->id.service_mask & service_id) ==
407                     (service_mask & cur_cm_id_priv->id.service_id) &&
408                     (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
409                     !data_cmp)
410                         return cur_cm_id_priv;
411
412                 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
413                         link = &(*link)->rb_left;
414                 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
415                         link = &(*link)->rb_right;
416                 else if (service_id < cur_cm_id_priv->id.service_id)
417                         link = &(*link)->rb_left;
418                 else if (service_id > cur_cm_id_priv->id.service_id)
419                         link = &(*link)->rb_right;
420                 else if (data_cmp < 0)
421                         link = &(*link)->rb_left;
422                 else
423                         link = &(*link)->rb_right;
424         }
425         rb_link_node(&cm_id_priv->service_node, parent, link);
426         rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
427         return NULL;
428 }
429
430 static struct cm_id_private * cm_find_listen(struct ib_device *device,
431                                              __be64 service_id,
432                                              u8 *private_data)
433 {
434         struct rb_node *node = cm.listen_service_table.rb_node;
435         struct cm_id_private *cm_id_priv;
436         int data_cmp;
437
438         while (node) {
439                 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
440                 data_cmp = cm_compare_private_data(private_data,
441                                                    cm_id_priv->compare_data);
442                 if ((cm_id_priv->id.service_mask & service_id) ==
443                      cm_id_priv->id.service_id &&
444                     (cm_id_priv->id.device == device) && !data_cmp)
445                         return cm_id_priv;
446
447                 if (device < cm_id_priv->id.device)
448                         node = node->rb_left;
449                 else if (device > cm_id_priv->id.device)
450                         node = node->rb_right;
451                 else if (service_id < cm_id_priv->id.service_id)
452                         node = node->rb_left;
453                 else if (service_id > cm_id_priv->id.service_id)
454                         node = node->rb_right;
455                 else if (data_cmp < 0)
456                         node = node->rb_left;
457                 else
458                         node = node->rb_right;
459         }
460         return NULL;
461 }
462
463 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
464                                                      *timewait_info)
465 {
466         struct rb_node **link = &cm.remote_id_table.rb_node;
467         struct rb_node *parent = NULL;
468         struct cm_timewait_info *cur_timewait_info;
469         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
470         __be32 remote_id = timewait_info->work.remote_id;
471
472         while (*link) {
473                 parent = *link;
474                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
475                                              remote_id_node);
476                 if (remote_id < cur_timewait_info->work.remote_id)
477                         link = &(*link)->rb_left;
478                 else if (remote_id > cur_timewait_info->work.remote_id)
479                         link = &(*link)->rb_right;
480                 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
481                         link = &(*link)->rb_left;
482                 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
483                         link = &(*link)->rb_right;
484                 else
485                         return cur_timewait_info;
486         }
487         timewait_info->inserted_remote_id = 1;
488         rb_link_node(&timewait_info->remote_id_node, parent, link);
489         rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
490         return NULL;
491 }
492
493 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
494                                                    __be32 remote_id)
495 {
496         struct rb_node *node = cm.remote_id_table.rb_node;
497         struct cm_timewait_info *timewait_info;
498
499         while (node) {
500                 timewait_info = rb_entry(node, struct cm_timewait_info,
501                                          remote_id_node);
502                 if (remote_id < timewait_info->work.remote_id)
503                         node = node->rb_left;
504                 else if (remote_id > timewait_info->work.remote_id)
505                         node = node->rb_right;
506                 else if (remote_ca_guid < timewait_info->remote_ca_guid)
507                         node = node->rb_left;
508                 else if (remote_ca_guid > timewait_info->remote_ca_guid)
509                         node = node->rb_right;
510                 else
511                         return timewait_info;
512         }
513         return NULL;
514 }
515
516 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
517                                                       *timewait_info)
518 {
519         struct rb_node **link = &cm.remote_qp_table.rb_node;
520         struct rb_node *parent = NULL;
521         struct cm_timewait_info *cur_timewait_info;
522         __be64 remote_ca_guid = timewait_info->remote_ca_guid;
523         __be32 remote_qpn = timewait_info->remote_qpn;
524
525         while (*link) {
526                 parent = *link;
527                 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
528                                              remote_qp_node);
529                 if (remote_qpn < cur_timewait_info->remote_qpn)
530                         link = &(*link)->rb_left;
531                 else if (remote_qpn > cur_timewait_info->remote_qpn)
532                         link = &(*link)->rb_right;
533                 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
534                         link = &(*link)->rb_left;
535                 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
536                         link = &(*link)->rb_right;
537                 else
538                         return cur_timewait_info;
539         }
540         timewait_info->inserted_remote_qp = 1;
541         rb_link_node(&timewait_info->remote_qp_node, parent, link);
542         rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
543         return NULL;
544 }
545
546 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
547                                                     *cm_id_priv)
548 {
549         struct rb_node **link = &cm.remote_sidr_table.rb_node;
550         struct rb_node *parent = NULL;
551         struct cm_id_private *cur_cm_id_priv;
552         union ib_gid *port_gid = &cm_id_priv->av.dgid;
553         __be32 remote_id = cm_id_priv->id.remote_id;
554
555         while (*link) {
556                 parent = *link;
557                 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
558                                           sidr_id_node);
559                 if (remote_id < cur_cm_id_priv->id.remote_id)
560                         link = &(*link)->rb_left;
561                 else if (remote_id > cur_cm_id_priv->id.remote_id)
562                         link = &(*link)->rb_right;
563                 else {
564                         int cmp;
565                         cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
566                                      sizeof *port_gid);
567                         if (cmp < 0)
568                                 link = &(*link)->rb_left;
569                         else if (cmp > 0)
570                                 link = &(*link)->rb_right;
571                         else
572                                 return cur_cm_id_priv;
573                 }
574         }
575         rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
576         rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
577         return NULL;
578 }
579
580 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
581                                enum ib_cm_sidr_status status)
582 {
583         struct ib_cm_sidr_rep_param param;
584
585         memset(&param, 0, sizeof param);
586         param.status = status;
587         ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
588 }
589
590 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
591                                  ib_cm_handler cm_handler,
592                                  void *context)
593 {
594         struct cm_id_private *cm_id_priv;
595         int ret;
596
597         cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
598         if (!cm_id_priv)
599                 return ERR_PTR(-ENOMEM);
600
601         cm_id_priv->id.state = IB_CM_IDLE;
602         cm_id_priv->id.device = device;
603         cm_id_priv->id.cm_handler = cm_handler;
604         cm_id_priv->id.context = context;
605         cm_id_priv->id.remote_cm_qpn = 1;
606         ret = cm_alloc_id(cm_id_priv);
607         if (ret)
608                 goto error;
609
610         spin_lock_init(&cm_id_priv->lock);
611         init_completion(&cm_id_priv->comp);
612         INIT_LIST_HEAD(&cm_id_priv->work_list);
613         atomic_set(&cm_id_priv->work_count, -1);
614         atomic_set(&cm_id_priv->refcount, 1);
615         return &cm_id_priv->id;
616
617 error:
618         kfree(cm_id_priv);
619         return ERR_PTR(-ENOMEM);
620 }
621 EXPORT_SYMBOL(ib_create_cm_id);
622
623 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
624 {
625         struct cm_work *work;
626
627         if (list_empty(&cm_id_priv->work_list))
628                 return NULL;
629
630         work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
631         list_del(&work->list);
632         return work;
633 }
634
635 static void cm_free_work(struct cm_work *work)
636 {
637         if (work->mad_recv_wc)
638                 ib_free_recv_mad(work->mad_recv_wc);
639         kfree(work);
640 }
641
642 static inline int cm_convert_to_ms(int iba_time)
643 {
644         /* approximate conversion to ms from 4.096us x 2^iba_time */
645         return 1 << max(iba_time - 8, 0);
646 }
647
648 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
649 {
650         if (timewait_info->inserted_remote_id) {
651                 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
652                 timewait_info->inserted_remote_id = 0;
653         }
654
655         if (timewait_info->inserted_remote_qp) {
656                 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
657                 timewait_info->inserted_remote_qp = 0;
658         }
659 }
660
661 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
662 {
663         struct cm_timewait_info *timewait_info;
664
665         timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
666         if (!timewait_info)
667                 return ERR_PTR(-ENOMEM);
668
669         timewait_info->work.local_id = local_id;
670         INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
671         timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
672         return timewait_info;
673 }
674
675 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
676 {
677         int wait_time;
678         unsigned long flags;
679
680         spin_lock_irqsave(&cm.lock, flags);
681         cm_cleanup_timewait(cm_id_priv->timewait_info);
682         list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
683         spin_unlock_irqrestore(&cm.lock, flags);
684
685         /*
686          * The cm_id could be destroyed by the user before we exit timewait.
687          * To protect against this, we search for the cm_id after exiting
688          * timewait before notifying the user that we've exited timewait.
689          */
690         cm_id_priv->id.state = IB_CM_TIMEWAIT;
691         wait_time = cm_convert_to_ms(cm_id_priv->av.packet_life_time + 1);
692         queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
693                            msecs_to_jiffies(wait_time));
694         cm_id_priv->timewait_info = NULL;
695 }
696
697 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
698 {
699         unsigned long flags;
700
701         cm_id_priv->id.state = IB_CM_IDLE;
702         if (cm_id_priv->timewait_info) {
703                 spin_lock_irqsave(&cm.lock, flags);
704                 cm_cleanup_timewait(cm_id_priv->timewait_info);
705                 spin_unlock_irqrestore(&cm.lock, flags);
706                 kfree(cm_id_priv->timewait_info);
707                 cm_id_priv->timewait_info = NULL;
708         }
709 }
710
711 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
712 {
713         struct cm_id_private *cm_id_priv;
714         struct cm_work *work;
715         unsigned long flags;
716
717         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
718 retest:
719         spin_lock_irqsave(&cm_id_priv->lock, flags);
720         switch (cm_id->state) {
721         case IB_CM_LISTEN:
722                 cm_id->state = IB_CM_IDLE;
723                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
724                 spin_lock_irqsave(&cm.lock, flags);
725                 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
726                 spin_unlock_irqrestore(&cm.lock, flags);
727                 break;
728         case IB_CM_SIDR_REQ_SENT:
729                 cm_id->state = IB_CM_IDLE;
730                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
731                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
732                 break;
733         case IB_CM_SIDR_REQ_RCVD:
734                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
735                 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
736                 break;
737         case IB_CM_REQ_SENT:
738                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
739                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
740                 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
741                                &cm_id_priv->id.device->node_guid,
742                                sizeof cm_id_priv->id.device->node_guid,
743                                NULL, 0);
744                 break;
745         case IB_CM_REQ_RCVD:
746                 if (err == -ENOMEM) {
747                         /* Do not reject to allow future retries. */
748                         cm_reset_to_idle(cm_id_priv);
749                         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
750                 } else {
751                         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
752                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
753                                        NULL, 0, NULL, 0);
754                 }
755                 break;
756         case IB_CM_MRA_REQ_RCVD:
757         case IB_CM_REP_SENT:
758         case IB_CM_MRA_REP_RCVD:
759                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
760                 /* Fall through */
761         case IB_CM_MRA_REQ_SENT:
762         case IB_CM_REP_RCVD:
763         case IB_CM_MRA_REP_SENT:
764                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
765                 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
766                                NULL, 0, NULL, 0);
767                 break;
768         case IB_CM_ESTABLISHED:
769                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
770                 ib_send_cm_dreq(cm_id, NULL, 0);
771                 goto retest;
772         case IB_CM_DREQ_SENT:
773                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
774                 cm_enter_timewait(cm_id_priv);
775                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
776                 break;
777         case IB_CM_DREQ_RCVD:
778                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
779                 ib_send_cm_drep(cm_id, NULL, 0);
780                 break;
781         default:
782                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
783                 break;
784         }
785
786         cm_free_id(cm_id->local_id);
787         cm_deref_id(cm_id_priv);
788         wait_for_completion(&cm_id_priv->comp);
789         while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
790                 cm_free_work(work);
791         kfree(cm_id_priv->compare_data);
792         kfree(cm_id_priv->private_data);
793         kfree(cm_id_priv);
794 }
795
796 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
797 {
798         cm_destroy_id(cm_id, 0);
799 }
800 EXPORT_SYMBOL(ib_destroy_cm_id);
801
802 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
803                  struct ib_cm_compare_data *compare_data)
804 {
805         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
806         unsigned long flags;
807         int ret = 0;
808
809         service_mask = service_mask ? service_mask :
810                        __constant_cpu_to_be64(~0ULL);
811         service_id &= service_mask;
812         if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
813             (service_id != IB_CM_ASSIGN_SERVICE_ID))
814                 return -EINVAL;
815
816         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
817         if (cm_id->state != IB_CM_IDLE)
818                 return -EINVAL;
819
820         if (compare_data) {
821                 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
822                                                    GFP_KERNEL);
823                 if (!cm_id_priv->compare_data)
824                         return -ENOMEM;
825                 cm_mask_copy(cm_id_priv->compare_data->data,
826                              compare_data->data, compare_data->mask);
827                 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
828                        IB_CM_COMPARE_SIZE);
829         }
830
831         cm_id->state = IB_CM_LISTEN;
832
833         spin_lock_irqsave(&cm.lock, flags);
834         if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
835                 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
836                 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
837         } else {
838                 cm_id->service_id = service_id;
839                 cm_id->service_mask = service_mask;
840         }
841         cur_cm_id_priv = cm_insert_listen(cm_id_priv);
842         spin_unlock_irqrestore(&cm.lock, flags);
843
844         if (cur_cm_id_priv) {
845                 cm_id->state = IB_CM_IDLE;
846                 kfree(cm_id_priv->compare_data);
847                 cm_id_priv->compare_data = NULL;
848                 ret = -EBUSY;
849         }
850         return ret;
851 }
852 EXPORT_SYMBOL(ib_cm_listen);
853
854 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
855                           enum cm_msg_sequence msg_seq)
856 {
857         u64 hi_tid, low_tid;
858
859         hi_tid   = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
860         low_tid  = (u64) ((__force u32)cm_id_priv->id.local_id |
861                           (msg_seq << 30));
862         return cpu_to_be64(hi_tid | low_tid);
863 }
864
865 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
866                               __be16 attr_id, __be64 tid)
867 {
868         hdr->base_version  = IB_MGMT_BASE_VERSION;
869         hdr->mgmt_class    = IB_MGMT_CLASS_CM;
870         hdr->class_version = IB_CM_CLASS_VERSION;
871         hdr->method        = IB_MGMT_METHOD_SEND;
872         hdr->attr_id       = attr_id;
873         hdr->tid           = tid;
874 }
875
876 static void cm_format_req(struct cm_req_msg *req_msg,
877                           struct cm_id_private *cm_id_priv,
878                           struct ib_cm_req_param *param)
879 {
880         cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
881                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
882
883         req_msg->local_comm_id = cm_id_priv->id.local_id;
884         req_msg->service_id = param->service_id;
885         req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
886         cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
887         cm_req_set_resp_res(req_msg, param->responder_resources);
888         cm_req_set_init_depth(req_msg, param->initiator_depth);
889         cm_req_set_remote_resp_timeout(req_msg,
890                                        param->remote_cm_response_timeout);
891         cm_req_set_qp_type(req_msg, param->qp_type);
892         cm_req_set_flow_ctrl(req_msg, param->flow_control);
893         cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
894         cm_req_set_local_resp_timeout(req_msg,
895                                       param->local_cm_response_timeout);
896         cm_req_set_retry_count(req_msg, param->retry_count);
897         req_msg->pkey = param->primary_path->pkey;
898         cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
899         cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
900         cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
901         cm_req_set_srq(req_msg, param->srq);
902
903         req_msg->primary_local_lid = param->primary_path->slid;
904         req_msg->primary_remote_lid = param->primary_path->dlid;
905         req_msg->primary_local_gid = param->primary_path->sgid;
906         req_msg->primary_remote_gid = param->primary_path->dgid;
907         cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label);
908         cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate);
909         req_msg->primary_traffic_class = param->primary_path->traffic_class;
910         req_msg->primary_hop_limit = param->primary_path->hop_limit;
911         cm_req_set_primary_sl(req_msg, param->primary_path->sl);
912         cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */
913         cm_req_set_primary_local_ack_timeout(req_msg,
914                 min(31, param->primary_path->packet_life_time + 1));
915
916         if (param->alternate_path) {
917                 req_msg->alt_local_lid = param->alternate_path->slid;
918                 req_msg->alt_remote_lid = param->alternate_path->dlid;
919                 req_msg->alt_local_gid = param->alternate_path->sgid;
920                 req_msg->alt_remote_gid = param->alternate_path->dgid;
921                 cm_req_set_alt_flow_label(req_msg,
922                                           param->alternate_path->flow_label);
923                 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate);
924                 req_msg->alt_traffic_class = param->alternate_path->traffic_class;
925                 req_msg->alt_hop_limit = param->alternate_path->hop_limit;
926                 cm_req_set_alt_sl(req_msg, param->alternate_path->sl);
927                 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */
928                 cm_req_set_alt_local_ack_timeout(req_msg,
929                         min(31, param->alternate_path->packet_life_time + 1));
930         }
931
932         if (param->private_data && param->private_data_len)
933                 memcpy(req_msg->private_data, param->private_data,
934                        param->private_data_len);
935 }
936
937 static int cm_validate_req_param(struct ib_cm_req_param *param)
938 {
939         /* peer-to-peer not supported */
940         if (param->peer_to_peer)
941                 return -EINVAL;
942
943         if (!param->primary_path)
944                 return -EINVAL;
945
946         if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
947                 return -EINVAL;
948
949         if (param->private_data &&
950             param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
951                 return -EINVAL;
952
953         if (param->alternate_path &&
954             (param->alternate_path->pkey != param->primary_path->pkey ||
955              param->alternate_path->mtu != param->primary_path->mtu))
956                 return -EINVAL;
957
958         return 0;
959 }
960
961 int ib_send_cm_req(struct ib_cm_id *cm_id,
962                    struct ib_cm_req_param *param)
963 {
964         struct cm_id_private *cm_id_priv;
965         struct cm_req_msg *req_msg;
966         unsigned long flags;
967         int ret;
968
969         ret = cm_validate_req_param(param);
970         if (ret)
971                 return ret;
972
973         /* Verify that we're not in timewait. */
974         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
975         spin_lock_irqsave(&cm_id_priv->lock, flags);
976         if (cm_id->state != IB_CM_IDLE) {
977                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
978                 ret = -EINVAL;
979                 goto out;
980         }
981         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
982
983         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
984                                                             id.local_id);
985         if (IS_ERR(cm_id_priv->timewait_info)) {
986                 ret = PTR_ERR(cm_id_priv->timewait_info);
987                 goto out;
988         }
989
990         ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
991         if (ret)
992                 goto error1;
993         if (param->alternate_path) {
994                 ret = cm_init_av_by_path(param->alternate_path,
995                                          &cm_id_priv->alt_av);
996                 if (ret)
997                         goto error1;
998         }
999         cm_id->service_id = param->service_id;
1000         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
1001         cm_id_priv->timeout_ms = cm_convert_to_ms(
1002                                     param->primary_path->packet_life_time) * 2 +
1003                                  cm_convert_to_ms(
1004                                     param->remote_cm_response_timeout);
1005         cm_id_priv->max_cm_retries = param->max_cm_retries;
1006         cm_id_priv->initiator_depth = param->initiator_depth;
1007         cm_id_priv->responder_resources = param->responder_resources;
1008         cm_id_priv->retry_count = param->retry_count;
1009         cm_id_priv->path_mtu = param->primary_path->mtu;
1010         cm_id_priv->pkey = param->primary_path->pkey;
1011         cm_id_priv->qp_type = param->qp_type;
1012
1013         ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1014         if (ret)
1015                 goto error1;
1016
1017         req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1018         cm_format_req(req_msg, cm_id_priv, param);
1019         cm_id_priv->tid = req_msg->hdr.tid;
1020         cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1021         cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1022
1023         cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1024         cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1025
1026         spin_lock_irqsave(&cm_id_priv->lock, flags);
1027         ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1028         if (ret) {
1029                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1030                 goto error2;
1031         }
1032         BUG_ON(cm_id->state != IB_CM_IDLE);
1033         cm_id->state = IB_CM_REQ_SENT;
1034         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1035         return 0;
1036
1037 error2: cm_free_msg(cm_id_priv->msg);
1038 error1: kfree(cm_id_priv->timewait_info);
1039 out:    return ret;
1040 }
1041 EXPORT_SYMBOL(ib_send_cm_req);
1042
1043 static int cm_issue_rej(struct cm_port *port,
1044                         struct ib_mad_recv_wc *mad_recv_wc,
1045                         enum ib_cm_rej_reason reason,
1046                         enum cm_msg_response msg_rejected,
1047                         void *ari, u8 ari_length)
1048 {
1049         struct ib_mad_send_buf *msg = NULL;
1050         struct cm_rej_msg *rej_msg, *rcv_msg;
1051         int ret;
1052
1053         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1054         if (ret)
1055                 return ret;
1056
1057         /* We just need common CM header information.  Cast to any message. */
1058         rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1059         rej_msg = (struct cm_rej_msg *) msg->mad;
1060
1061         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1062         rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1063         rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1064         cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1065         rej_msg->reason = cpu_to_be16(reason);
1066
1067         if (ari && ari_length) {
1068                 cm_rej_set_reject_info_len(rej_msg, ari_length);
1069                 memcpy(rej_msg->ari, ari, ari_length);
1070         }
1071
1072         ret = ib_post_send_mad(msg, NULL);
1073         if (ret)
1074                 cm_free_msg(msg);
1075
1076         return ret;
1077 }
1078
1079 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1080                                     __be32 local_qpn, __be32 remote_qpn)
1081 {
1082         return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1083                 ((local_ca_guid == remote_ca_guid) &&
1084                  (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1085 }
1086
1087 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1088                                             struct ib_sa_path_rec *primary_path,
1089                                             struct ib_sa_path_rec *alt_path)
1090 {
1091         memset(primary_path, 0, sizeof *primary_path);
1092         primary_path->dgid = req_msg->primary_local_gid;
1093         primary_path->sgid = req_msg->primary_remote_gid;
1094         primary_path->dlid = req_msg->primary_local_lid;
1095         primary_path->slid = req_msg->primary_remote_lid;
1096         primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1097         primary_path->hop_limit = req_msg->primary_hop_limit;
1098         primary_path->traffic_class = req_msg->primary_traffic_class;
1099         primary_path->reversible = 1;
1100         primary_path->pkey = req_msg->pkey;
1101         primary_path->sl = cm_req_get_primary_sl(req_msg);
1102         primary_path->mtu_selector = IB_SA_EQ;
1103         primary_path->mtu = cm_req_get_path_mtu(req_msg);
1104         primary_path->rate_selector = IB_SA_EQ;
1105         primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1106         primary_path->packet_life_time_selector = IB_SA_EQ;
1107         primary_path->packet_life_time =
1108                 cm_req_get_primary_local_ack_timeout(req_msg);
1109         primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1110
1111         if (req_msg->alt_local_lid) {
1112                 memset(alt_path, 0, sizeof *alt_path);
1113                 alt_path->dgid = req_msg->alt_local_gid;
1114                 alt_path->sgid = req_msg->alt_remote_gid;
1115                 alt_path->dlid = req_msg->alt_local_lid;
1116                 alt_path->slid = req_msg->alt_remote_lid;
1117                 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1118                 alt_path->hop_limit = req_msg->alt_hop_limit;
1119                 alt_path->traffic_class = req_msg->alt_traffic_class;
1120                 alt_path->reversible = 1;
1121                 alt_path->pkey = req_msg->pkey;
1122                 alt_path->sl = cm_req_get_alt_sl(req_msg);
1123                 alt_path->mtu_selector = IB_SA_EQ;
1124                 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1125                 alt_path->rate_selector = IB_SA_EQ;
1126                 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1127                 alt_path->packet_life_time_selector = IB_SA_EQ;
1128                 alt_path->packet_life_time =
1129                         cm_req_get_alt_local_ack_timeout(req_msg);
1130                 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1131         }
1132 }
1133
1134 static void cm_format_req_event(struct cm_work *work,
1135                                 struct cm_id_private *cm_id_priv,
1136                                 struct ib_cm_id *listen_id)
1137 {
1138         struct cm_req_msg *req_msg;
1139         struct ib_cm_req_event_param *param;
1140
1141         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1142         param = &work->cm_event.param.req_rcvd;
1143         param->listen_id = listen_id;
1144         param->port = cm_id_priv->av.port->port_num;
1145         param->primary_path = &work->path[0];
1146         if (req_msg->alt_local_lid)
1147                 param->alternate_path = &work->path[1];
1148         else
1149                 param->alternate_path = NULL;
1150         param->remote_ca_guid = req_msg->local_ca_guid;
1151         param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1152         param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1153         param->qp_type = cm_req_get_qp_type(req_msg);
1154         param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1155         param->responder_resources = cm_req_get_init_depth(req_msg);
1156         param->initiator_depth = cm_req_get_resp_res(req_msg);
1157         param->local_cm_response_timeout =
1158                                         cm_req_get_remote_resp_timeout(req_msg);
1159         param->flow_control = cm_req_get_flow_ctrl(req_msg);
1160         param->remote_cm_response_timeout =
1161                                         cm_req_get_local_resp_timeout(req_msg);
1162         param->retry_count = cm_req_get_retry_count(req_msg);
1163         param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1164         param->srq = cm_req_get_srq(req_msg);
1165         work->cm_event.private_data = &req_msg->private_data;
1166 }
1167
1168 static void cm_process_work(struct cm_id_private *cm_id_priv,
1169                             struct cm_work *work)
1170 {
1171         unsigned long flags;
1172         int ret;
1173
1174         /* We will typically only have the current event to report. */
1175         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1176         cm_free_work(work);
1177
1178         while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1179                 spin_lock_irqsave(&cm_id_priv->lock, flags);
1180                 work = cm_dequeue_work(cm_id_priv);
1181                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1182                 BUG_ON(!work);
1183                 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1184                                                 &work->cm_event);
1185                 cm_free_work(work);
1186         }
1187         cm_deref_id(cm_id_priv);
1188         if (ret)
1189                 cm_destroy_id(&cm_id_priv->id, ret);
1190 }
1191
1192 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1193                           struct cm_id_private *cm_id_priv,
1194                           enum cm_msg_response msg_mraed, u8 service_timeout,
1195                           const void *private_data, u8 private_data_len)
1196 {
1197         cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1198         cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1199         mra_msg->local_comm_id = cm_id_priv->id.local_id;
1200         mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1201         cm_mra_set_service_timeout(mra_msg, service_timeout);
1202
1203         if (private_data && private_data_len)
1204                 memcpy(mra_msg->private_data, private_data, private_data_len);
1205 }
1206
1207 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1208                           struct cm_id_private *cm_id_priv,
1209                           enum ib_cm_rej_reason reason,
1210                           void *ari,
1211                           u8 ari_length,
1212                           const void *private_data,
1213                           u8 private_data_len)
1214 {
1215         cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1216         rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1217
1218         switch(cm_id_priv->id.state) {
1219         case IB_CM_REQ_RCVD:
1220                 rej_msg->local_comm_id = 0;
1221                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1222                 break;
1223         case IB_CM_MRA_REQ_SENT:
1224                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1225                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1226                 break;
1227         case IB_CM_REP_RCVD:
1228         case IB_CM_MRA_REP_SENT:
1229                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1230                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1231                 break;
1232         default:
1233                 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1234                 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1235                 break;
1236         }
1237
1238         rej_msg->reason = cpu_to_be16(reason);
1239         if (ari && ari_length) {
1240                 cm_rej_set_reject_info_len(rej_msg, ari_length);
1241                 memcpy(rej_msg->ari, ari, ari_length);
1242         }
1243
1244         if (private_data && private_data_len)
1245                 memcpy(rej_msg->private_data, private_data, private_data_len);
1246 }
1247
1248 static void cm_dup_req_handler(struct cm_work *work,
1249                                struct cm_id_private *cm_id_priv)
1250 {
1251         struct ib_mad_send_buf *msg = NULL;
1252         unsigned long flags;
1253         int ret;
1254
1255         /* Quick state check to discard duplicate REQs. */
1256         if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1257                 return;
1258
1259         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1260         if (ret)
1261                 return;
1262
1263         spin_lock_irqsave(&cm_id_priv->lock, flags);
1264         switch (cm_id_priv->id.state) {
1265         case IB_CM_MRA_REQ_SENT:
1266                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1267                               CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1268                               cm_id_priv->private_data,
1269                               cm_id_priv->private_data_len);
1270                 break;
1271         case IB_CM_TIMEWAIT:
1272                 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1273                               IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1274                 break;
1275         default:
1276                 goto unlock;
1277         }
1278         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1279
1280         ret = ib_post_send_mad(msg, NULL);
1281         if (ret)
1282                 goto free;
1283         return;
1284
1285 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1286 free:   cm_free_msg(msg);
1287 }
1288
1289 static struct cm_id_private * cm_match_req(struct cm_work *work,
1290                                            struct cm_id_private *cm_id_priv)
1291 {
1292         struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1293         struct cm_timewait_info *timewait_info;
1294         struct cm_req_msg *req_msg;
1295         unsigned long flags;
1296
1297         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1298
1299         /* Check for duplicate REQ and stale connections. */
1300         spin_lock_irqsave(&cm.lock, flags);
1301         timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1302         if (!timewait_info)
1303                 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1304
1305         if (timewait_info) {
1306                 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1307                                            timewait_info->work.remote_id);
1308                 cm_cleanup_timewait(cm_id_priv->timewait_info);
1309                 spin_unlock_irqrestore(&cm.lock, flags);
1310                 if (cur_cm_id_priv) {
1311                         cm_dup_req_handler(work, cur_cm_id_priv);
1312                         cm_deref_id(cur_cm_id_priv);
1313                 } else
1314                         cm_issue_rej(work->port, work->mad_recv_wc,
1315                                      IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1316                                      NULL, 0);
1317                 listen_cm_id_priv = NULL;
1318                 goto out;
1319         }
1320
1321         /* Find matching listen request. */
1322         listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1323                                            req_msg->service_id,
1324                                            req_msg->private_data);
1325         if (!listen_cm_id_priv) {
1326                 cm_cleanup_timewait(cm_id_priv->timewait_info);
1327                 spin_unlock_irqrestore(&cm.lock, flags);
1328                 cm_issue_rej(work->port, work->mad_recv_wc,
1329                              IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1330                              NULL, 0);
1331                 goto out;
1332         }
1333         atomic_inc(&listen_cm_id_priv->refcount);
1334         atomic_inc(&cm_id_priv->refcount);
1335         cm_id_priv->id.state = IB_CM_REQ_RCVD;
1336         atomic_inc(&cm_id_priv->work_count);
1337         spin_unlock_irqrestore(&cm.lock, flags);
1338 out:
1339         return listen_cm_id_priv;
1340 }
1341
1342 static int cm_req_handler(struct cm_work *work)
1343 {
1344         struct ib_cm_id *cm_id;
1345         struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1346         struct cm_req_msg *req_msg;
1347         int ret;
1348
1349         req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1350
1351         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
1352         if (IS_ERR(cm_id))
1353                 return PTR_ERR(cm_id);
1354
1355         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1356         cm_id_priv->id.remote_id = req_msg->local_comm_id;
1357         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1358                                 work->mad_recv_wc->recv_buf.grh,
1359                                 &cm_id_priv->av);
1360         cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1361                                                             id.local_id);
1362         if (IS_ERR(cm_id_priv->timewait_info)) {
1363                 ret = PTR_ERR(cm_id_priv->timewait_info);
1364                 goto destroy;
1365         }
1366         cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1367         cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1368         cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1369
1370         listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1371         if (!listen_cm_id_priv) {
1372                 ret = -EINVAL;
1373                 kfree(cm_id_priv->timewait_info);
1374                 goto destroy;
1375         }
1376
1377         cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1378         cm_id_priv->id.context = listen_cm_id_priv->id.context;
1379         cm_id_priv->id.service_id = req_msg->service_id;
1380         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
1381
1382         cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1383         ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1384         if (ret) {
1385                 ib_get_cached_gid(work->port->cm_dev->device,
1386                                   work->port->port_num, 0, &work->path[0].sgid);
1387                 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1388                                &work->path[0].sgid, sizeof work->path[0].sgid,
1389                                NULL, 0);
1390                 goto rejected;
1391         }
1392         if (req_msg->alt_local_lid) {
1393                 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1394                 if (ret) {
1395                         ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1396                                        &work->path[0].sgid,
1397                                        sizeof work->path[0].sgid, NULL, 0);
1398                         goto rejected;
1399                 }
1400         }
1401         cm_id_priv->tid = req_msg->hdr.tid;
1402         cm_id_priv->timeout_ms = cm_convert_to_ms(
1403                                         cm_req_get_local_resp_timeout(req_msg));
1404         cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1405         cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1406         cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1407         cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1408         cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1409         cm_id_priv->pkey = req_msg->pkey;
1410         cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1411         cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1412         cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1413         cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1414
1415         cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1416         cm_process_work(cm_id_priv, work);
1417         cm_deref_id(listen_cm_id_priv);
1418         return 0;
1419
1420 rejected:
1421         atomic_dec(&cm_id_priv->refcount);
1422         cm_deref_id(listen_cm_id_priv);
1423 destroy:
1424         ib_destroy_cm_id(cm_id);
1425         return ret;
1426 }
1427
1428 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1429                           struct cm_id_private *cm_id_priv,
1430                           struct ib_cm_rep_param *param)
1431 {
1432         cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1433         rep_msg->local_comm_id = cm_id_priv->id.local_id;
1434         rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1435         cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1436         cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1437         rep_msg->resp_resources = param->responder_resources;
1438         rep_msg->initiator_depth = param->initiator_depth;
1439         cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay);
1440         cm_rep_set_failover(rep_msg, param->failover_accepted);
1441         cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1442         cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1443         cm_rep_set_srq(rep_msg, param->srq);
1444         rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1445
1446         if (param->private_data && param->private_data_len)
1447                 memcpy(rep_msg->private_data, param->private_data,
1448                        param->private_data_len);
1449 }
1450
1451 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1452                    struct ib_cm_rep_param *param)
1453 {
1454         struct cm_id_private *cm_id_priv;
1455         struct ib_mad_send_buf *msg;
1456         struct cm_rep_msg *rep_msg;
1457         unsigned long flags;
1458         int ret;
1459
1460         if (param->private_data &&
1461             param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1462                 return -EINVAL;
1463
1464         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1465         spin_lock_irqsave(&cm_id_priv->lock, flags);
1466         if (cm_id->state != IB_CM_REQ_RCVD &&
1467             cm_id->state != IB_CM_MRA_REQ_SENT) {
1468                 ret = -EINVAL;
1469                 goto out;
1470         }
1471
1472         ret = cm_alloc_msg(cm_id_priv, &msg);
1473         if (ret)
1474                 goto out;
1475
1476         rep_msg = (struct cm_rep_msg *) msg->mad;
1477         cm_format_rep(rep_msg, cm_id_priv, param);
1478         msg->timeout_ms = cm_id_priv->timeout_ms;
1479         msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1480
1481         ret = ib_post_send_mad(msg, NULL);
1482         if (ret) {
1483                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1484                 cm_free_msg(msg);
1485                 return ret;
1486         }
1487
1488         cm_id->state = IB_CM_REP_SENT;
1489         cm_id_priv->msg = msg;
1490         cm_id_priv->initiator_depth = param->initiator_depth;
1491         cm_id_priv->responder_resources = param->responder_resources;
1492         cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1493         cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1494
1495 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1496         return ret;
1497 }
1498 EXPORT_SYMBOL(ib_send_cm_rep);
1499
1500 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1501                           struct cm_id_private *cm_id_priv,
1502                           const void *private_data,
1503                           u8 private_data_len)
1504 {
1505         cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1506         rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1507         rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1508
1509         if (private_data && private_data_len)
1510                 memcpy(rtu_msg->private_data, private_data, private_data_len);
1511 }
1512
1513 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1514                    const void *private_data,
1515                    u8 private_data_len)
1516 {
1517         struct cm_id_private *cm_id_priv;
1518         struct ib_mad_send_buf *msg;
1519         unsigned long flags;
1520         void *data;
1521         int ret;
1522
1523         if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1524                 return -EINVAL;
1525
1526         data = cm_copy_private_data(private_data, private_data_len);
1527         if (IS_ERR(data))
1528                 return PTR_ERR(data);
1529
1530         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1531         spin_lock_irqsave(&cm_id_priv->lock, flags);
1532         if (cm_id->state != IB_CM_REP_RCVD &&
1533             cm_id->state != IB_CM_MRA_REP_SENT) {
1534                 ret = -EINVAL;
1535                 goto error;
1536         }
1537
1538         ret = cm_alloc_msg(cm_id_priv, &msg);
1539         if (ret)
1540                 goto error;
1541
1542         cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1543                       private_data, private_data_len);
1544
1545         ret = ib_post_send_mad(msg, NULL);
1546         if (ret) {
1547                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1548                 cm_free_msg(msg);
1549                 kfree(data);
1550                 return ret;
1551         }
1552
1553         cm_id->state = IB_CM_ESTABLISHED;
1554         cm_set_private_data(cm_id_priv, data, private_data_len);
1555         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1556         return 0;
1557
1558 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1559         kfree(data);
1560         return ret;
1561 }
1562 EXPORT_SYMBOL(ib_send_cm_rtu);
1563
1564 static void cm_format_rep_event(struct cm_work *work)
1565 {
1566         struct cm_rep_msg *rep_msg;
1567         struct ib_cm_rep_event_param *param;
1568
1569         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1570         param = &work->cm_event.param.rep_rcvd;
1571         param->remote_ca_guid = rep_msg->local_ca_guid;
1572         param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1573         param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1574         param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1575         param->responder_resources = rep_msg->initiator_depth;
1576         param->initiator_depth = rep_msg->resp_resources;
1577         param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1578         param->failover_accepted = cm_rep_get_failover(rep_msg);
1579         param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1580         param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1581         param->srq = cm_rep_get_srq(rep_msg);
1582         work->cm_event.private_data = &rep_msg->private_data;
1583 }
1584
1585 static void cm_dup_rep_handler(struct cm_work *work)
1586 {
1587         struct cm_id_private *cm_id_priv;
1588         struct cm_rep_msg *rep_msg;
1589         struct ib_mad_send_buf *msg = NULL;
1590         unsigned long flags;
1591         int ret;
1592
1593         rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1594         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1595                                    rep_msg->local_comm_id);
1596         if (!cm_id_priv)
1597                 return;
1598
1599         ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1600         if (ret)
1601                 goto deref;
1602
1603         spin_lock_irqsave(&cm_id_priv->lock, flags);
1604         if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1605                 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1606                               cm_id_priv->private_data,
1607                               cm_id_priv->private_data_len);
1608         else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1609                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1610                               CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1611                               cm_id_priv->private_data,
1612                               cm_id_priv->private_data_len);
1613         else
1614                 goto unlock;
1615         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1616
1617         ret = ib_post_send_mad(msg, NULL);
1618         if (ret)
1619                 goto free;
1620         goto deref;
1621
1622 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1623 free:   cm_free_msg(msg);
1624 deref:  cm_deref_id(cm_id_priv);
1625 }
1626
1627 static int cm_rep_handler(struct cm_work *work)
1628 {
1629         struct cm_id_private *cm_id_priv;
1630         struct cm_rep_msg *rep_msg;
1631         unsigned long flags;
1632         int ret;
1633
1634         rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1635         cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1636         if (!cm_id_priv) {
1637                 cm_dup_rep_handler(work);
1638                 return -EINVAL;
1639         }
1640
1641         cm_format_rep_event(work);
1642
1643         spin_lock_irqsave(&cm_id_priv->lock, flags);
1644         switch (cm_id_priv->id.state) {
1645         case IB_CM_REQ_SENT:
1646         case IB_CM_MRA_REQ_RCVD:
1647                 break;
1648         default:
1649                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1650                 ret = -EINVAL;
1651                 goto error;
1652         }
1653
1654         cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1655         cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1656         cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1657
1658         spin_lock(&cm.lock);
1659         /* Check for duplicate REP. */
1660         if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1661                 spin_unlock(&cm.lock);
1662                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1663                 ret = -EINVAL;
1664                 goto error;
1665         }
1666         /* Check for a stale connection. */
1667         if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1668                 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1669                          &cm.remote_id_table);
1670                 cm_id_priv->timewait_info->inserted_remote_id = 0;
1671                 spin_unlock(&cm.lock);
1672                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1673                 cm_issue_rej(work->port, work->mad_recv_wc,
1674                              IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1675                              NULL, 0);
1676                 ret = -EINVAL;
1677                 goto error;
1678         }
1679         spin_unlock(&cm.lock);
1680
1681         cm_id_priv->id.state = IB_CM_REP_RCVD;
1682         cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1683         cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1684         cm_id_priv->initiator_depth = rep_msg->resp_resources;
1685         cm_id_priv->responder_resources = rep_msg->initiator_depth;
1686         cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1687         cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1688
1689         /* todo: handle peer_to_peer */
1690
1691         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1692         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1693         if (!ret)
1694                 list_add_tail(&work->list, &cm_id_priv->work_list);
1695         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1696
1697         if (ret)
1698                 cm_process_work(cm_id_priv, work);
1699         else
1700                 cm_deref_id(cm_id_priv);
1701         return 0;
1702
1703 error:
1704         cm_deref_id(cm_id_priv);
1705         return ret;
1706 }
1707
1708 static int cm_establish_handler(struct cm_work *work)
1709 {
1710         struct cm_id_private *cm_id_priv;
1711         unsigned long flags;
1712         int ret;
1713
1714         /* See comment in cm_establish about lookup. */
1715         cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1716         if (!cm_id_priv)
1717                 return -EINVAL;
1718
1719         spin_lock_irqsave(&cm_id_priv->lock, flags);
1720         if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1721                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1722                 goto out;
1723         }
1724
1725         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1726         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1727         if (!ret)
1728                 list_add_tail(&work->list, &cm_id_priv->work_list);
1729         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1730
1731         if (ret)
1732                 cm_process_work(cm_id_priv, work);
1733         else
1734                 cm_deref_id(cm_id_priv);
1735         return 0;
1736 out:
1737         cm_deref_id(cm_id_priv);
1738         return -EINVAL;
1739 }
1740
1741 static int cm_rtu_handler(struct cm_work *work)
1742 {
1743         struct cm_id_private *cm_id_priv;
1744         struct cm_rtu_msg *rtu_msg;
1745         unsigned long flags;
1746         int ret;
1747
1748         rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1749         cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1750                                    rtu_msg->local_comm_id);
1751         if (!cm_id_priv)
1752                 return -EINVAL;
1753
1754         work->cm_event.private_data = &rtu_msg->private_data;
1755
1756         spin_lock_irqsave(&cm_id_priv->lock, flags);
1757         if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1758             cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1759                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1760                 goto out;
1761         }
1762         cm_id_priv->id.state = IB_CM_ESTABLISHED;
1763
1764         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1765         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1766         if (!ret)
1767                 list_add_tail(&work->list, &cm_id_priv->work_list);
1768         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1769
1770         if (ret)
1771                 cm_process_work(cm_id_priv, work);
1772         else
1773                 cm_deref_id(cm_id_priv);
1774         return 0;
1775 out:
1776         cm_deref_id(cm_id_priv);
1777         return -EINVAL;
1778 }
1779
1780 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1781                           struct cm_id_private *cm_id_priv,
1782                           const void *private_data,
1783                           u8 private_data_len)
1784 {
1785         cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1786                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1787         dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1788         dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1789         cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1790
1791         if (private_data && private_data_len)
1792                 memcpy(dreq_msg->private_data, private_data, private_data_len);
1793 }
1794
1795 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1796                     const void *private_data,
1797                     u8 private_data_len)
1798 {
1799         struct cm_id_private *cm_id_priv;
1800         struct ib_mad_send_buf *msg;
1801         unsigned long flags;
1802         int ret;
1803
1804         if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1805                 return -EINVAL;
1806
1807         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1808         spin_lock_irqsave(&cm_id_priv->lock, flags);
1809         if (cm_id->state != IB_CM_ESTABLISHED) {
1810                 ret = -EINVAL;
1811                 goto out;
1812         }
1813
1814         ret = cm_alloc_msg(cm_id_priv, &msg);
1815         if (ret) {
1816                 cm_enter_timewait(cm_id_priv);
1817                 goto out;
1818         }
1819
1820         cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1821                        private_data, private_data_len);
1822         msg->timeout_ms = cm_id_priv->timeout_ms;
1823         msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
1824
1825         ret = ib_post_send_mad(msg, NULL);
1826         if (ret) {
1827                 cm_enter_timewait(cm_id_priv);
1828                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1829                 cm_free_msg(msg);
1830                 return ret;
1831         }
1832
1833         cm_id->state = IB_CM_DREQ_SENT;
1834         cm_id_priv->msg = msg;
1835 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1836         return ret;
1837 }
1838 EXPORT_SYMBOL(ib_send_cm_dreq);
1839
1840 static void cm_format_drep(struct cm_drep_msg *drep_msg,
1841                           struct cm_id_private *cm_id_priv,
1842                           const void *private_data,
1843                           u8 private_data_len)
1844 {
1845         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
1846         drep_msg->local_comm_id = cm_id_priv->id.local_id;
1847         drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1848
1849         if (private_data && private_data_len)
1850                 memcpy(drep_msg->private_data, private_data, private_data_len);
1851 }
1852
1853 int ib_send_cm_drep(struct ib_cm_id *cm_id,
1854                     const void *private_data,
1855                     u8 private_data_len)
1856 {
1857         struct cm_id_private *cm_id_priv;
1858         struct ib_mad_send_buf *msg;
1859         unsigned long flags;
1860         void *data;
1861         int ret;
1862
1863         if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
1864                 return -EINVAL;
1865
1866         data = cm_copy_private_data(private_data, private_data_len);
1867         if (IS_ERR(data))
1868                 return PTR_ERR(data);
1869
1870         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1871         spin_lock_irqsave(&cm_id_priv->lock, flags);
1872         if (cm_id->state != IB_CM_DREQ_RCVD) {
1873                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1874                 kfree(data);
1875                 return -EINVAL;
1876         }
1877
1878         cm_set_private_data(cm_id_priv, data, private_data_len);
1879         cm_enter_timewait(cm_id_priv);
1880
1881         ret = cm_alloc_msg(cm_id_priv, &msg);
1882         if (ret)
1883                 goto out;
1884
1885         cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1886                        private_data, private_data_len);
1887
1888         ret = ib_post_send_mad(msg, NULL);
1889         if (ret) {
1890                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1891                 cm_free_msg(msg);
1892                 return ret;
1893         }
1894
1895 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1896         return ret;
1897 }
1898 EXPORT_SYMBOL(ib_send_cm_drep);
1899
1900 static int cm_issue_drep(struct cm_port *port,
1901                          struct ib_mad_recv_wc *mad_recv_wc)
1902 {
1903         struct ib_mad_send_buf *msg = NULL;
1904         struct cm_dreq_msg *dreq_msg;
1905         struct cm_drep_msg *drep_msg;
1906         int ret;
1907
1908         ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1909         if (ret)
1910                 return ret;
1911
1912         dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
1913         drep_msg = (struct cm_drep_msg *) msg->mad;
1914
1915         cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
1916         drep_msg->remote_comm_id = dreq_msg->local_comm_id;
1917         drep_msg->local_comm_id = dreq_msg->remote_comm_id;
1918
1919         ret = ib_post_send_mad(msg, NULL);
1920         if (ret)
1921                 cm_free_msg(msg);
1922
1923         return ret;
1924 }
1925
1926 static int cm_dreq_handler(struct cm_work *work)
1927 {
1928         struct cm_id_private *cm_id_priv;
1929         struct cm_dreq_msg *dreq_msg;
1930         struct ib_mad_send_buf *msg = NULL;
1931         unsigned long flags;
1932         int ret;
1933
1934         dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
1935         cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
1936                                    dreq_msg->local_comm_id);
1937         if (!cm_id_priv) {
1938                 cm_issue_drep(work->port, work->mad_recv_wc);
1939                 return -EINVAL;
1940         }
1941
1942         work->cm_event.private_data = &dreq_msg->private_data;
1943
1944         spin_lock_irqsave(&cm_id_priv->lock, flags);
1945         if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
1946                 goto unlock;
1947
1948         switch (cm_id_priv->id.state) {
1949         case IB_CM_REP_SENT:
1950         case IB_CM_DREQ_SENT:
1951                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1952                 break;
1953         case IB_CM_ESTABLISHED:
1954         case IB_CM_MRA_REP_RCVD:
1955                 break;
1956         case IB_CM_TIMEWAIT:
1957                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
1958                         goto unlock;
1959
1960                 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1961                                cm_id_priv->private_data,
1962                                cm_id_priv->private_data_len);
1963                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1964
1965                 if (ib_post_send_mad(msg, NULL))
1966                         cm_free_msg(msg);
1967                 goto deref;
1968         default:
1969                 goto unlock;
1970         }
1971         cm_id_priv->id.state = IB_CM_DREQ_RCVD;
1972         cm_id_priv->tid = dreq_msg->hdr.tid;
1973         ret = atomic_inc_and_test(&cm_id_priv->work_count);
1974         if (!ret)
1975                 list_add_tail(&work->list, &cm_id_priv->work_list);
1976         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1977
1978         if (ret)
1979                 cm_process_work(cm_id_priv, work);
1980         else
1981                 cm_deref_id(cm_id_priv);
1982         return 0;
1983
1984 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1985 deref:  cm_deref_id(cm_id_priv);
1986         return -EINVAL;
1987 }
1988
1989 static int cm_drep_handler(struct cm_work *work)
1990 {
1991         struct cm_id_private *cm_id_priv;
1992         struct cm_drep_msg *drep_msg;
1993         unsigned long flags;
1994         int ret;
1995
1996         drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
1997         cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
1998                                    drep_msg->local_comm_id);
1999         if (!cm_id_priv)
2000                 return -EINVAL;
2001
2002         work->cm_event.private_data = &drep_msg->private_data;
2003
2004         spin_lock_irqsave(&cm_id_priv->lock, flags);
2005         if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2006             cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2007                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2008                 goto out;
2009         }
2010         cm_enter_timewait(cm_id_priv);
2011
2012         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2013         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2014         if (!ret)
2015                 list_add_tail(&work->list, &cm_id_priv->work_list);
2016         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2017
2018         if (ret)
2019                 cm_process_work(cm_id_priv, work);
2020         else
2021                 cm_deref_id(cm_id_priv);
2022         return 0;
2023 out:
2024         cm_deref_id(cm_id_priv);
2025         return -EINVAL;
2026 }
2027
2028 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2029                    enum ib_cm_rej_reason reason,
2030                    void *ari,
2031                    u8 ari_length,
2032                    const void *private_data,
2033                    u8 private_data_len)
2034 {
2035         struct cm_id_private *cm_id_priv;
2036         struct ib_mad_send_buf *msg;
2037         unsigned long flags;
2038         int ret;
2039
2040         if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2041             (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2042                 return -EINVAL;
2043
2044         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2045
2046         spin_lock_irqsave(&cm_id_priv->lock, flags);
2047         switch (cm_id->state) {
2048         case IB_CM_REQ_SENT:
2049         case IB_CM_MRA_REQ_RCVD:
2050         case IB_CM_REQ_RCVD:
2051         case IB_CM_MRA_REQ_SENT:
2052         case IB_CM_REP_RCVD:
2053         case IB_CM_MRA_REP_SENT:
2054                 ret = cm_alloc_msg(cm_id_priv, &msg);
2055                 if (!ret)
2056                         cm_format_rej((struct cm_rej_msg *) msg->mad,
2057                                       cm_id_priv, reason, ari, ari_length,
2058                                       private_data, private_data_len);
2059
2060                 cm_reset_to_idle(cm_id_priv);
2061                 break;
2062         case IB_CM_REP_SENT:
2063         case IB_CM_MRA_REP_RCVD:
2064                 ret = cm_alloc_msg(cm_id_priv, &msg);
2065                 if (!ret)
2066                         cm_format_rej((struct cm_rej_msg *) msg->mad,
2067                                       cm_id_priv, reason, ari, ari_length,
2068                                       private_data, private_data_len);
2069
2070                 cm_enter_timewait(cm_id_priv);
2071                 break;
2072         default:
2073                 ret = -EINVAL;
2074                 goto out;
2075         }
2076
2077         if (ret)
2078                 goto out;
2079
2080         ret = ib_post_send_mad(msg, NULL);
2081         if (ret)
2082                 cm_free_msg(msg);
2083
2084 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2085         return ret;
2086 }
2087 EXPORT_SYMBOL(ib_send_cm_rej);
2088
2089 static void cm_format_rej_event(struct cm_work *work)
2090 {
2091         struct cm_rej_msg *rej_msg;
2092         struct ib_cm_rej_event_param *param;
2093
2094         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2095         param = &work->cm_event.param.rej_rcvd;
2096         param->ari = rej_msg->ari;
2097         param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2098         param->reason = __be16_to_cpu(rej_msg->reason);
2099         work->cm_event.private_data = &rej_msg->private_data;
2100 }
2101
2102 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2103 {
2104         struct cm_timewait_info *timewait_info;
2105         struct cm_id_private *cm_id_priv;
2106         unsigned long flags;
2107         __be32 remote_id;
2108
2109         remote_id = rej_msg->local_comm_id;
2110
2111         if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2112                 spin_lock_irqsave(&cm.lock, flags);
2113                 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2114                                                   remote_id);
2115                 if (!timewait_info) {
2116                         spin_unlock_irqrestore(&cm.lock, flags);
2117                         return NULL;
2118                 }
2119                 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2120                                       (timewait_info->work.local_id ^
2121                                        cm.random_id_operand));
2122                 if (cm_id_priv) {
2123                         if (cm_id_priv->id.remote_id == remote_id)
2124                                 atomic_inc(&cm_id_priv->refcount);
2125                         else
2126                                 cm_id_priv = NULL;
2127                 }
2128                 spin_unlock_irqrestore(&cm.lock, flags);
2129         } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2130                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2131         else
2132                 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2133
2134         return cm_id_priv;
2135 }
2136
2137 static int cm_rej_handler(struct cm_work *work)
2138 {
2139         struct cm_id_private *cm_id_priv;
2140         struct cm_rej_msg *rej_msg;
2141         unsigned long flags;
2142         int ret;
2143
2144         rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2145         cm_id_priv = cm_acquire_rejected_id(rej_msg);
2146         if (!cm_id_priv)
2147                 return -EINVAL;
2148
2149         cm_format_rej_event(work);
2150
2151         spin_lock_irqsave(&cm_id_priv->lock, flags);
2152         switch (cm_id_priv->id.state) {
2153         case IB_CM_REQ_SENT:
2154         case IB_CM_MRA_REQ_RCVD:
2155         case IB_CM_REP_SENT:
2156         case IB_CM_MRA_REP_RCVD:
2157                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2158                 /* fall through */
2159         case IB_CM_REQ_RCVD:
2160         case IB_CM_MRA_REQ_SENT:
2161                 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2162                         cm_enter_timewait(cm_id_priv);
2163                 else
2164                         cm_reset_to_idle(cm_id_priv);
2165                 break;
2166         case IB_CM_DREQ_SENT:
2167                 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2168                 /* fall through */
2169         case IB_CM_REP_RCVD:
2170         case IB_CM_MRA_REP_SENT:
2171         case IB_CM_ESTABLISHED:
2172                 cm_enter_timewait(cm_id_priv);
2173                 break;
2174         default:
2175                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2176                 ret = -EINVAL;
2177                 goto out;
2178         }
2179
2180         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2181         if (!ret)
2182                 list_add_tail(&work->list, &cm_id_priv->work_list);
2183         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2184
2185         if (ret)
2186                 cm_process_work(cm_id_priv, work);
2187         else
2188                 cm_deref_id(cm_id_priv);
2189         return 0;
2190 out:
2191         cm_deref_id(cm_id_priv);
2192         return -EINVAL;
2193 }
2194
2195 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2196                    u8 service_timeout,
2197                    const void *private_data,
2198                    u8 private_data_len)
2199 {
2200         struct cm_id_private *cm_id_priv;
2201         struct ib_mad_send_buf *msg;
2202         void *data;
2203         unsigned long flags;
2204         int ret;
2205
2206         if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2207                 return -EINVAL;
2208
2209         data = cm_copy_private_data(private_data, private_data_len);
2210         if (IS_ERR(data))
2211                 return PTR_ERR(data);
2212
2213         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2214
2215         spin_lock_irqsave(&cm_id_priv->lock, flags);
2216         switch(cm_id_priv->id.state) {
2217         case IB_CM_REQ_RCVD:
2218                 ret = cm_alloc_msg(cm_id_priv, &msg);
2219                 if (ret)
2220                         goto error1;
2221
2222                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2223                               CM_MSG_RESPONSE_REQ, service_timeout,
2224                               private_data, private_data_len);
2225                 ret = ib_post_send_mad(msg, NULL);
2226                 if (ret)
2227                         goto error2;
2228                 cm_id->state = IB_CM_MRA_REQ_SENT;
2229                 break;
2230         case IB_CM_REP_RCVD:
2231                 ret = cm_alloc_msg(cm_id_priv, &msg);
2232                 if (ret)
2233                         goto error1;
2234
2235                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2236                               CM_MSG_RESPONSE_REP, service_timeout,
2237                               private_data, private_data_len);
2238                 ret = ib_post_send_mad(msg, NULL);
2239                 if (ret)
2240                         goto error2;
2241                 cm_id->state = IB_CM_MRA_REP_SENT;
2242                 break;
2243         case IB_CM_ESTABLISHED:
2244                 ret = cm_alloc_msg(cm_id_priv, &msg);
2245                 if (ret)
2246                         goto error1;
2247
2248                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2249                               CM_MSG_RESPONSE_OTHER, service_timeout,
2250                               private_data, private_data_len);
2251                 ret = ib_post_send_mad(msg, NULL);
2252                 if (ret)
2253                         goto error2;
2254                 cm_id->lap_state = IB_CM_MRA_LAP_SENT;
2255                 break;
2256         default:
2257                 ret = -EINVAL;
2258                 goto error1;
2259         }
2260         cm_id_priv->service_timeout = service_timeout;
2261         cm_set_private_data(cm_id_priv, data, private_data_len);
2262         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2263         return 0;
2264
2265 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2266         kfree(data);
2267         return ret;
2268
2269 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2270         kfree(data);
2271         cm_free_msg(msg);
2272         return ret;
2273 }
2274 EXPORT_SYMBOL(ib_send_cm_mra);
2275
2276 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2277 {
2278         switch (cm_mra_get_msg_mraed(mra_msg)) {
2279         case CM_MSG_RESPONSE_REQ:
2280                 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2281         case CM_MSG_RESPONSE_REP:
2282         case CM_MSG_RESPONSE_OTHER:
2283                 return cm_acquire_id(mra_msg->remote_comm_id,
2284                                      mra_msg->local_comm_id);
2285         default:
2286                 return NULL;
2287         }
2288 }
2289
2290 static int cm_mra_handler(struct cm_work *work)
2291 {
2292         struct cm_id_private *cm_id_priv;
2293         struct cm_mra_msg *mra_msg;
2294         unsigned long flags;
2295         int timeout, ret;
2296
2297         mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2298         cm_id_priv = cm_acquire_mraed_id(mra_msg);
2299         if (!cm_id_priv)
2300                 return -EINVAL;
2301
2302         work->cm_event.private_data = &mra_msg->private_data;
2303         work->cm_event.param.mra_rcvd.service_timeout =
2304                                         cm_mra_get_service_timeout(mra_msg);
2305         timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2306                   cm_convert_to_ms(cm_id_priv->av.packet_life_time);
2307
2308         spin_lock_irqsave(&cm_id_priv->lock, flags);
2309         switch (cm_id_priv->id.state) {
2310         case IB_CM_REQ_SENT:
2311                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2312                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2313                                   cm_id_priv->msg, timeout))
2314                         goto out;
2315                 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2316                 break;
2317         case IB_CM_REP_SENT:
2318                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2319                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2320                                   cm_id_priv->msg, timeout))
2321                         goto out;
2322                 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2323                 break;
2324         case IB_CM_ESTABLISHED:
2325                 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2326                     cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2327                     ib_modify_mad(cm_id_priv->av.port->mad_agent,
2328                                   cm_id_priv->msg, timeout))
2329                         goto out;
2330                 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2331                 break;
2332         default:
2333                 goto out;
2334         }
2335
2336         cm_id_priv->msg->context[1] = (void *) (unsigned long)
2337                                       cm_id_priv->id.state;
2338         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2339         if (!ret)
2340                 list_add_tail(&work->list, &cm_id_priv->work_list);
2341         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2342
2343         if (ret)
2344                 cm_process_work(cm_id_priv, work);
2345         else
2346                 cm_deref_id(cm_id_priv);
2347         return 0;
2348 out:
2349         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2350         cm_deref_id(cm_id_priv);
2351         return -EINVAL;
2352 }
2353
2354 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2355                           struct cm_id_private *cm_id_priv,
2356                           struct ib_sa_path_rec *alternate_path,
2357                           const void *private_data,
2358                           u8 private_data_len)
2359 {
2360         cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2361                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2362         lap_msg->local_comm_id = cm_id_priv->id.local_id;
2363         lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2364         cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2365         /* todo: need remote CM response timeout */
2366         cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2367         lap_msg->alt_local_lid = alternate_path->slid;
2368         lap_msg->alt_remote_lid = alternate_path->dlid;
2369         lap_msg->alt_local_gid = alternate_path->sgid;
2370         lap_msg->alt_remote_gid = alternate_path->dgid;
2371         cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2372         cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2373         lap_msg->alt_hop_limit = alternate_path->hop_limit;
2374         cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2375         cm_lap_set_sl(lap_msg, alternate_path->sl);
2376         cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2377         cm_lap_set_local_ack_timeout(lap_msg,
2378                 min(31, alternate_path->packet_life_time + 1));
2379
2380         if (private_data && private_data_len)
2381                 memcpy(lap_msg->private_data, private_data, private_data_len);
2382 }
2383
2384 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2385                    struct ib_sa_path_rec *alternate_path,
2386                    const void *private_data,
2387                    u8 private_data_len)
2388 {
2389         struct cm_id_private *cm_id_priv;
2390         struct ib_mad_send_buf *msg;
2391         unsigned long flags;
2392         int ret;
2393
2394         if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2395                 return -EINVAL;
2396
2397         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2398         spin_lock_irqsave(&cm_id_priv->lock, flags);
2399         if (cm_id->state != IB_CM_ESTABLISHED ||
2400             (cm_id->lap_state != IB_CM_LAP_UNINIT &&
2401              cm_id->lap_state != IB_CM_LAP_IDLE)) {
2402                 ret = -EINVAL;
2403                 goto out;
2404         }
2405
2406         ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av);
2407         if (ret)
2408                 goto out;
2409
2410         ret = cm_alloc_msg(cm_id_priv, &msg);
2411         if (ret)
2412                 goto out;
2413
2414         cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2415                       alternate_path, private_data, private_data_len);
2416         msg->timeout_ms = cm_id_priv->timeout_ms;
2417         msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2418
2419         ret = ib_post_send_mad(msg, NULL);
2420         if (ret) {
2421                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2422                 cm_free_msg(msg);
2423                 return ret;
2424         }
2425
2426         cm_id->lap_state = IB_CM_LAP_SENT;
2427         cm_id_priv->msg = msg;
2428
2429 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2430         return ret;
2431 }
2432 EXPORT_SYMBOL(ib_send_cm_lap);
2433
2434 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
2435                                     struct ib_sa_path_rec *path,
2436                                     struct cm_lap_msg *lap_msg)
2437 {
2438         memset(path, 0, sizeof *path);
2439         path->dgid = lap_msg->alt_local_gid;
2440         path->sgid = lap_msg->alt_remote_gid;
2441         path->dlid = lap_msg->alt_local_lid;
2442         path->slid = lap_msg->alt_remote_lid;
2443         path->flow_label = cm_lap_get_flow_label(lap_msg);
2444         path->hop_limit = lap_msg->alt_hop_limit;
2445         path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2446         path->reversible = 1;
2447         path->pkey = cm_id_priv->pkey;
2448         path->sl = cm_lap_get_sl(lap_msg);
2449         path->mtu_selector = IB_SA_EQ;
2450         path->mtu = cm_id_priv->path_mtu;
2451         path->rate_selector = IB_SA_EQ;
2452         path->rate = cm_lap_get_packet_rate(lap_msg);
2453         path->packet_life_time_selector = IB_SA_EQ;
2454         path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2455         path->packet_life_time -= (path->packet_life_time > 0);
2456 }
2457
2458 static int cm_lap_handler(struct cm_work *work)
2459 {
2460         struct cm_id_private *cm_id_priv;
2461         struct cm_lap_msg *lap_msg;
2462         struct ib_cm_lap_event_param *param;
2463         struct ib_mad_send_buf *msg = NULL;
2464         unsigned long flags;
2465         int ret;
2466
2467         /* todo: verify LAP request and send reject APR if invalid. */
2468         lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2469         cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2470                                    lap_msg->local_comm_id);
2471         if (!cm_id_priv)
2472                 return -EINVAL;
2473
2474         param = &work->cm_event.param.lap_rcvd;
2475         param->alternate_path = &work->path[0];
2476         cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
2477         work->cm_event.private_data = &lap_msg->private_data;
2478
2479         spin_lock_irqsave(&cm_id_priv->lock, flags);
2480         if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2481                 goto unlock;
2482
2483         switch (cm_id_priv->id.lap_state) {
2484         case IB_CM_LAP_UNINIT:
2485         case IB_CM_LAP_IDLE:
2486                 break;
2487         case IB_CM_MRA_LAP_SENT:
2488                 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2489                         goto unlock;
2490
2491                 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2492                               CM_MSG_RESPONSE_OTHER,
2493                               cm_id_priv->service_timeout,
2494                               cm_id_priv->private_data,
2495                               cm_id_priv->private_data_len);
2496                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2497
2498                 if (ib_post_send_mad(msg, NULL))
2499                         cm_free_msg(msg);
2500                 goto deref;
2501         default:
2502                 goto unlock;
2503         }
2504
2505         cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2506         cm_id_priv->tid = lap_msg->hdr.tid;
2507         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2508                                 work->mad_recv_wc->recv_buf.grh,
2509                                 &cm_id_priv->av);
2510         cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av);
2511         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2512         if (!ret)
2513                 list_add_tail(&work->list, &cm_id_priv->work_list);
2514         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2515
2516         if (ret)
2517                 cm_process_work(cm_id_priv, work);
2518         else
2519                 cm_deref_id(cm_id_priv);
2520         return 0;
2521
2522 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2523 deref:  cm_deref_id(cm_id_priv);
2524         return -EINVAL;
2525 }
2526
2527 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2528                           struct cm_id_private *cm_id_priv,
2529                           enum ib_cm_apr_status status,
2530                           void *info,
2531                           u8 info_length,
2532                           const void *private_data,
2533                           u8 private_data_len)
2534 {
2535         cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2536         apr_msg->local_comm_id = cm_id_priv->id.local_id;
2537         apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2538         apr_msg->ap_status = (u8) status;
2539
2540         if (info && info_length) {
2541                 apr_msg->info_length = info_length;
2542                 memcpy(apr_msg->info, info, info_length);
2543         }
2544
2545         if (private_data && private_data_len)
2546                 memcpy(apr_msg->private_data, private_data, private_data_len);
2547 }
2548
2549 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2550                    enum ib_cm_apr_status status,
2551                    void *info,
2552                    u8 info_length,
2553                    const void *private_data,
2554                    u8 private_data_len)
2555 {
2556         struct cm_id_private *cm_id_priv;
2557         struct ib_mad_send_buf *msg;
2558         unsigned long flags;
2559         int ret;
2560
2561         if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2562             (info && info_length > IB_CM_APR_INFO_LENGTH))
2563                 return -EINVAL;
2564
2565         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2566         spin_lock_irqsave(&cm_id_priv->lock, flags);
2567         if (cm_id->state != IB_CM_ESTABLISHED ||
2568             (cm_id->lap_state != IB_CM_LAP_RCVD &&
2569              cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2570                 ret = -EINVAL;
2571                 goto out;
2572         }
2573
2574         ret = cm_alloc_msg(cm_id_priv, &msg);
2575         if (ret)
2576                 goto out;
2577
2578         cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2579                       info, info_length, private_data, private_data_len);
2580         ret = ib_post_send_mad(msg, NULL);
2581         if (ret) {
2582                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2583                 cm_free_msg(msg);
2584                 return ret;
2585         }
2586
2587         cm_id->lap_state = IB_CM_LAP_IDLE;
2588 out:    spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2589         return ret;
2590 }
2591 EXPORT_SYMBOL(ib_send_cm_apr);
2592
2593 static int cm_apr_handler(struct cm_work *work)
2594 {
2595         struct cm_id_private *cm_id_priv;
2596         struct cm_apr_msg *apr_msg;
2597         unsigned long flags;
2598         int ret;
2599
2600         apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2601         cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2602                                    apr_msg->local_comm_id);
2603         if (!cm_id_priv)
2604                 return -EINVAL; /* Unmatched reply. */
2605
2606         work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2607         work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2608         work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2609         work->cm_event.private_data = &apr_msg->private_data;
2610
2611         spin_lock_irqsave(&cm_id_priv->lock, flags);
2612         if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2613             (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2614              cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2615                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2616                 goto out;
2617         }
2618         cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2619         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2620         cm_id_priv->msg = NULL;
2621
2622         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2623         if (!ret)
2624                 list_add_tail(&work->list, &cm_id_priv->work_list);
2625         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2626
2627         if (ret)
2628                 cm_process_work(cm_id_priv, work);
2629         else
2630                 cm_deref_id(cm_id_priv);
2631         return 0;
2632 out:
2633         cm_deref_id(cm_id_priv);
2634         return -EINVAL;
2635 }
2636
2637 static int cm_timewait_handler(struct cm_work *work)
2638 {
2639         struct cm_timewait_info *timewait_info;
2640         struct cm_id_private *cm_id_priv;
2641         int ret;
2642
2643         timewait_info = (struct cm_timewait_info *)work;
2644         spin_lock_irq(&cm.lock);
2645         list_del(&timewait_info->list);
2646         spin_unlock_irq(&cm.lock);
2647
2648         cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2649                                    timewait_info->work.remote_id);
2650         if (!cm_id_priv)
2651                 return -EINVAL;
2652
2653         spin_lock_irq(&cm_id_priv->lock);
2654         if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2655             cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2656                 spin_unlock_irq(&cm_id_priv->lock);
2657                 goto out;
2658         }
2659         cm_id_priv->id.state = IB_CM_IDLE;
2660         ret = atomic_inc_and_test(&cm_id_priv->work_count);
2661         if (!ret)
2662                 list_add_tail(&work->list, &cm_id_priv->work_list);
2663         spin_unlock_irq(&cm_id_priv->lock);
2664
2665         if (ret)
2666                 cm_process_work(cm_id_priv, work);
2667         else
2668                 cm_deref_id(cm_id_priv);
2669         return 0;
2670 out:
2671         cm_deref_id(cm_id_priv);
2672         return -EINVAL;
2673 }
2674
2675 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2676                                struct cm_id_private *cm_id_priv,
2677                                struct ib_cm_sidr_req_param *param)
2678 {
2679         cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2680                           cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2681         sidr_req_msg->request_id = cm_id_priv->id.local_id;
2682         sidr_req_msg->pkey = cpu_to_be16(param->path->pkey);
2683         sidr_req_msg->service_id = param->service_id;
2684
2685         if (param->private_data && param->private_data_len)
2686                 memcpy(sidr_req_msg->private_data, param->private_data,
2687                        param->private_data_len);
2688 }
2689
2690 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2691                         struct ib_cm_sidr_req_param *param)
2692 {
2693         struct cm_id_private *cm_id_priv;
2694         struct ib_mad_send_buf *msg;
2695         unsigned long flags;
2696         int ret;
2697
2698         if (!param->path || (param->private_data &&
2699              param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2700                 return -EINVAL;
2701
2702         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2703         ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2704         if (ret)
2705                 goto out;
2706
2707         cm_id->service_id = param->service_id;
2708         cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
2709         cm_id_priv->timeout_ms = param->timeout_ms;
2710         cm_id_priv->max_cm_retries = param->max_cm_retries;
2711         ret = cm_alloc_msg(cm_id_priv, &msg);
2712         if (ret)
2713                 goto out;
2714
2715         cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2716                            param);
2717         msg->timeout_ms = cm_id_priv->timeout_ms;
2718         msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2719
2720         spin_lock_irqsave(&cm_id_priv->lock, flags);
2721         if (cm_id->state == IB_CM_IDLE)
2722                 ret = ib_post_send_mad(msg, NULL);
2723         else
2724                 ret = -EINVAL;
2725
2726         if (ret) {
2727                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2728                 cm_free_msg(msg);
2729                 goto out;
2730         }
2731         cm_id->state = IB_CM_SIDR_REQ_SENT;
2732         cm_id_priv->msg = msg;
2733         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2734 out:
2735         return ret;
2736 }
2737 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2738
2739 static void cm_format_sidr_req_event(struct cm_work *work,
2740                                      struct ib_cm_id *listen_id)
2741 {
2742         struct cm_sidr_req_msg *sidr_req_msg;
2743         struct ib_cm_sidr_req_event_param *param;
2744
2745         sidr_req_msg = (struct cm_sidr_req_msg *)
2746                                 work->mad_recv_wc->recv_buf.mad;
2747         param = &work->cm_event.param.sidr_req_rcvd;
2748         param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2749         param->listen_id = listen_id;
2750         param->port = work->port->port_num;
2751         work->cm_event.private_data = &sidr_req_msg->private_data;
2752 }
2753
2754 static int cm_sidr_req_handler(struct cm_work *work)
2755 {
2756         struct ib_cm_id *cm_id;
2757         struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2758         struct cm_sidr_req_msg *sidr_req_msg;
2759         struct ib_wc *wc;
2760         unsigned long flags;
2761
2762         cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
2763         if (IS_ERR(cm_id))
2764                 return PTR_ERR(cm_id);
2765         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2766
2767         /* Record SGID/SLID and request ID for lookup. */
2768         sidr_req_msg = (struct cm_sidr_req_msg *)
2769                                 work->mad_recv_wc->recv_buf.mad;
2770         wc = work->mad_recv_wc->wc;
2771         cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2772         cm_id_priv->av.dgid.global.interface_id = 0;
2773         cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2774                                 work->mad_recv_wc->recv_buf.grh,
2775                                 &cm_id_priv->av);
2776         cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2777         cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
2778         cm_id_priv->tid = sidr_req_msg->hdr.tid;
2779         atomic_inc(&cm_id_priv->work_count);
2780
2781         spin_lock_irqsave(&cm.lock, flags);
2782         cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2783         if (cur_cm_id_priv) {
2784                 spin_unlock_irqrestore(&cm.lock, flags);
2785                 goto out; /* Duplicate message. */
2786         }
2787         cur_cm_id_priv = cm_find_listen(cm_id->device,
2788                                         sidr_req_msg->service_id,
2789                                         sidr_req_msg->private_data);
2790         if (!cur_cm_id_priv) {
2791                 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2792                 spin_unlock_irqrestore(&cm.lock, flags);
2793                 /* todo: reply with no match */
2794                 goto out; /* No match. */
2795         }
2796         atomic_inc(&cur_cm_id_priv->refcount);
2797         spin_unlock_irqrestore(&cm.lock, flags);
2798
2799         cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2800         cm_id_priv->id.context = cur_cm_id_priv->id.context;
2801         cm_id_priv->id.service_id = sidr_req_msg->service_id;
2802         cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
2803
2804         cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2805         cm_process_work(cm_id_priv, work);
2806         cm_deref_id(cur_cm_id_priv);
2807         return 0;
2808 out:
2809         ib_destroy_cm_id(&cm_id_priv->id);
2810         return -EINVAL;
2811 }
2812
2813 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
2814                                struct cm_id_private *cm_id_priv,
2815                                struct ib_cm_sidr_rep_param *param)
2816 {
2817         cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
2818                           cm_id_priv->tid);
2819         sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
2820         sidr_rep_msg->status = param->status;
2821         cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
2822         sidr_rep_msg->service_id = cm_id_priv->id.service_id;
2823         sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
2824
2825         if (param->info && param->info_length)
2826                 memcpy(sidr_rep_msg->info, param->info, param->info_length);
2827
2828         if (param->private_data && param->private_data_len)
2829                 memcpy(sidr_rep_msg->private_data, param->private_data,
2830                        param->private_data_len);
2831 }
2832
2833 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
2834                         struct ib_cm_sidr_rep_param *param)
2835 {
2836         struct cm_id_private *cm_id_priv;
2837         struct ib_mad_send_buf *msg;
2838         unsigned long flags;
2839         int ret;
2840
2841         if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
2842             (param->private_data &&
2843              param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
2844                 return -EINVAL;
2845
2846         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2847         spin_lock_irqsave(&cm_id_priv->lock, flags);
2848         if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
2849                 ret = -EINVAL;
2850                 goto error;
2851         }
2852
2853         ret = cm_alloc_msg(cm_id_priv, &msg);
2854         if (ret)
2855                 goto error;
2856
2857         cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
2858                            param);
2859         ret = ib_post_send_mad(msg, NULL);
2860         if (ret) {
2861                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2862                 cm_free_msg(msg);
2863                 return ret;
2864         }
2865         cm_id->state = IB_CM_IDLE;
2866         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2867
2868         spin_lock_irqsave(&cm.lock, flags);
2869         rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2870         spin_unlock_irqrestore(&cm.lock, flags);
2871         return 0;
2872
2873 error:  spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2874         return ret;
2875 }
2876 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
2877
2878 static void cm_format_sidr_rep_event(struct cm_work *work)
2879 {
2880         struct cm_sidr_rep_msg *sidr_rep_msg;
2881         struct ib_cm_sidr_rep_event_param *param;
2882
2883         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2884                                 work->mad_recv_wc->recv_buf.mad;
2885         param = &work->cm_event.param.sidr_rep_rcvd;
2886         param->status = sidr_rep_msg->status;
2887         param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
2888         param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
2889         param->info = &sidr_rep_msg->info;
2890         param->info_len = sidr_rep_msg->info_length;
2891         work->cm_event.private_data = &sidr_rep_msg->private_data;
2892 }
2893
2894 static int cm_sidr_rep_handler(struct cm_work *work)
2895 {
2896         struct cm_sidr_rep_msg *sidr_rep_msg;
2897         struct cm_id_private *cm_id_priv;
2898         unsigned long flags;
2899
2900         sidr_rep_msg = (struct cm_sidr_rep_msg *)
2901                                 work->mad_recv_wc->recv_buf.mad;
2902         cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
2903         if (!cm_id_priv)
2904                 return -EINVAL; /* Unmatched reply. */
2905
2906         spin_lock_irqsave(&cm_id_priv->lock, flags);
2907         if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
2908                 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2909                 goto out;
2910         }
2911         cm_id_priv->id.state = IB_CM_IDLE;
2912         ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2913         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2914
2915         cm_format_sidr_rep_event(work);
2916         cm_process_work(cm_id_priv, work);
2917         return 0;
2918 out:
2919         cm_deref_id(cm_id_priv);
2920         return -EINVAL;
2921 }
2922
2923 static void cm_process_send_error(struct ib_mad_send_buf *msg,
2924                                   enum ib_wc_status wc_status)
2925 {
2926         struct cm_id_private *cm_id_priv;
2927         struct ib_cm_event cm_event;
2928         enum ib_cm_state state;
2929         unsigned long flags;
2930         int ret;
2931
2932         memset(&cm_event, 0, sizeof cm_event);
2933         cm_id_priv = msg->context[0];
2934
2935         /* Discard old sends or ones without a response. */
2936         spin_lock_irqsave(&cm_id_priv->lock, flags);
2937         state = (enum ib_cm_state) (unsigned long) msg->context[1];
2938         if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
2939                 goto discard;
2940
2941         switch (state) {
2942         case IB_CM_REQ_SENT:
2943         case IB_CM_MRA_REQ_RCVD:
2944                 cm_reset_to_idle(cm_id_priv);
2945                 cm_event.event = IB_CM_REQ_ERROR;
2946                 break;
2947         case IB_CM_REP_SENT:
2948         case IB_CM_MRA_REP_RCVD:
2949                 cm_reset_to_idle(cm_id_priv);
2950                 cm_event.event = IB_CM_REP_ERROR;
2951                 break;
2952         case IB_CM_DREQ_SENT:
2953                 cm_enter_timewait(cm_id_priv);
2954                 cm_event.event = IB_CM_DREQ_ERROR;
2955                 break;
2956         case IB_CM_SIDR_REQ_SENT:
2957                 cm_id_priv->id.state = IB_CM_IDLE;
2958                 cm_event.event = IB_CM_SIDR_REQ_ERROR;
2959                 break;
2960         default:
2961                 goto discard;
2962         }
2963         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2964         cm_event.param.send_status = wc_status;
2965
2966         /* No other events can occur on the cm_id at this point. */
2967         ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
2968         cm_free_msg(msg);
2969         if (ret)
2970                 ib_destroy_cm_id(&cm_id_priv->id);
2971         return;
2972 discard:
2973         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2974         cm_free_msg(msg);
2975 }
2976
2977 static void cm_send_handler(struct ib_mad_agent *mad_agent,
2978                             struct ib_mad_send_wc *mad_send_wc)
2979 {
2980         struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
2981
2982         switch (mad_send_wc->status) {
2983         case IB_WC_SUCCESS:
2984         case IB_WC_WR_FLUSH_ERR:
2985                 cm_free_msg(msg);
2986                 break;
2987         default:
2988                 if (msg->context[0] && msg->context[1])
2989                         cm_process_send_error(msg, mad_send_wc->status);
2990                 else
2991                         cm_free_msg(msg);
2992                 break;
2993         }
2994 }
2995
2996 static void cm_work_handler(struct work_struct *_work)
2997 {
2998         struct cm_work *work = container_of(_work, struct cm_work, work.work);
2999         int ret;
3000
3001         switch (work->cm_event.event) {
3002         case IB_CM_REQ_RECEIVED:
3003                 ret = cm_req_handler(work);
3004                 break;
3005         case IB_CM_MRA_RECEIVED:
3006                 ret = cm_mra_handler(work);
3007                 break;
3008         case IB_CM_REJ_RECEIVED:
3009                 ret = cm_rej_handler(work);
3010                 break;
3011         case IB_CM_REP_RECEIVED:
3012                 ret = cm_rep_handler(work);
3013                 break;
3014         case IB_CM_RTU_RECEIVED:
3015                 ret = cm_rtu_handler(work);
3016                 break;
3017         case IB_CM_USER_ESTABLISHED:
3018                 ret = cm_establish_handler(work);
3019                 break;
3020         case IB_CM_DREQ_RECEIVED:
3021                 ret = cm_dreq_handler(work);
3022                 break;
3023         case IB_CM_DREP_RECEIVED:
3024                 ret = cm_drep_handler(work);
3025                 break;
3026         case IB_CM_SIDR_REQ_RECEIVED:
3027                 ret = cm_sidr_req_handler(work);
3028                 break;
3029         case IB_CM_SIDR_REP_RECEIVED:
3030                 ret = cm_sidr_rep_handler(work);
3031                 break;
3032         case IB_CM_LAP_RECEIVED:
3033                 ret = cm_lap_handler(work);
3034                 break;
3035         case IB_CM_APR_RECEIVED:
3036                 ret = cm_apr_handler(work);
3037                 break;
3038         case IB_CM_TIMEWAIT_EXIT:
3039                 ret = cm_timewait_handler(work);
3040                 break;
3041         default:
3042                 ret = -EINVAL;
3043                 break;
3044         }
3045         if (ret)
3046                 cm_free_work(work);
3047 }
3048
3049 static int cm_establish(struct ib_cm_id *cm_id)
3050 {
3051         struct cm_id_private *cm_id_priv;
3052         struct cm_work *work;
3053         unsigned long flags;
3054         int ret = 0;
3055
3056         work = kmalloc(sizeof *work, GFP_ATOMIC);
3057         if (!work)
3058                 return -ENOMEM;
3059
3060         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3061         spin_lock_irqsave(&cm_id_priv->lock, flags);
3062         switch (cm_id->state)
3063         {
3064         case IB_CM_REP_SENT:
3065         case IB_CM_MRA_REP_RCVD:
3066                 cm_id->state = IB_CM_ESTABLISHED;
3067                 break;
3068         case IB_CM_ESTABLISHED:
3069                 ret = -EISCONN;
3070                 break;
3071         default:
3072                 ret = -EINVAL;
3073                 break;
3074         }
3075         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3076
3077         if (ret) {
3078                 kfree(work);
3079                 goto out;
3080         }
3081
3082         /*
3083          * The CM worker thread may try to destroy the cm_id before it
3084          * can execute this work item.  To prevent potential deadlock,
3085          * we need to find the cm_id once we're in the context of the
3086          * worker thread, rather than holding a reference on it.
3087          */
3088         INIT_DELAYED_WORK(&work->work, cm_work_handler);
3089         work->local_id = cm_id->local_id;
3090         work->remote_id = cm_id->remote_id;
3091         work->mad_recv_wc = NULL;
3092         work->cm_event.event = IB_CM_USER_ESTABLISHED;
3093         queue_delayed_work(cm.wq, &work->work, 0);
3094 out:
3095         return ret;
3096 }
3097
3098 static int cm_migrate(struct ib_cm_id *cm_id)
3099 {
3100         struct cm_id_private *cm_id_priv;
3101         unsigned long flags;
3102         int ret = 0;
3103
3104         cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3105         spin_lock_irqsave(&cm_id_priv->lock, flags);
3106         if (cm_id->state == IB_CM_ESTABLISHED &&
3107             (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3108              cm_id->lap_state == IB_CM_LAP_IDLE)) {
3109                 cm_id->lap_state = IB_CM_LAP_IDLE;
3110                 cm_id_priv->av = cm_id_priv->alt_av;
3111         } else
3112                 ret = -EINVAL;
3113         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3114
3115         return ret;
3116 }
3117
3118 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3119 {
3120         int ret;
3121
3122         switch (event) {
3123         case IB_EVENT_COMM_EST:
3124                 ret = cm_establish(cm_id);
3125                 break;
3126         case IB_EVENT_PATH_MIG:
3127                 ret = cm_migrate(cm_id);
3128                 break;
3129         default:
3130                 ret = -EINVAL;
3131         }
3132         return ret;
3133 }
3134 EXPORT_SYMBOL(ib_cm_notify);
3135
3136 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3137                             struct ib_mad_recv_wc *mad_recv_wc)
3138 {
3139         struct cm_work *work;
3140         enum ib_cm_event_type event;
3141         int paths = 0;
3142
3143         switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3144         case CM_REQ_ATTR_ID:
3145                 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3146                                                     alt_local_lid != 0);
3147                 event = IB_CM_REQ_RECEIVED;
3148                 break;
3149         case CM_MRA_ATTR_ID:
3150                 event = IB_CM_MRA_RECEIVED;
3151                 break;
3152         case CM_REJ_ATTR_ID:
3153                 event = IB_CM_REJ_RECEIVED;
3154                 break;
3155         case CM_REP_ATTR_ID:
3156                 event = IB_CM_REP_RECEIVED;
3157                 break;
3158         case CM_RTU_ATTR_ID:
3159                 event = IB_CM_RTU_RECEIVED;
3160                 break;
3161         case CM_DREQ_ATTR_ID:
3162                 event = IB_CM_DREQ_RECEIVED;
3163                 break;
3164         case CM_DREP_ATTR_ID:
3165                 event = IB_CM_DREP_RECEIVED;
3166                 break;
3167         case CM_SIDR_REQ_ATTR_ID:
3168                 event = IB_CM_SIDR_REQ_RECEIVED;
3169                 break;
3170         case CM_SIDR_REP_ATTR_ID:
3171                 event = IB_CM_SIDR_REP_RECEIVED;
3172                 break;
3173         case CM_LAP_ATTR_ID:
3174                 paths = 1;
3175                 event = IB_CM_LAP_RECEIVED;
3176                 break;
3177         case CM_APR_ATTR_ID:
3178                 event = IB_CM_APR_RECEIVED;
3179                 break;
3180         default:
3181                 ib_free_recv_mad(mad_recv_wc);
3182                 return;
3183         }
3184
3185         work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3186                        GFP_KERNEL);
3187         if (!work) {
3188                 ib_free_recv_mad(mad_recv_wc);
3189                 return;
3190         }
3191
3192         INIT_DELAYED_WORK(&work->work, cm_work_handler);
3193         work->cm_event.event = event;
3194         work->mad_recv_wc = mad_recv_wc;
3195         work->port = (struct cm_port *)mad_agent->context;
3196         queue_delayed_work(cm.wq, &work->work, 0);
3197 }
3198
3199 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3200                                 struct ib_qp_attr *qp_attr,
3201                                 int *qp_attr_mask)
3202 {
3203         unsigned long flags;
3204         int ret;
3205
3206         spin_lock_irqsave(&cm_id_priv->lock, flags);
3207         switch (cm_id_priv->id.state) {
3208         case IB_CM_REQ_SENT:
3209         case IB_CM_MRA_REQ_RCVD:
3210         case IB_CM_REQ_RCVD:
3211         case IB_CM_MRA_REQ_SENT:
3212         case IB_CM_REP_RCVD:
3213         case IB_CM_MRA_REP_SENT:
3214         case IB_CM_REP_SENT:
3215         case IB_CM_MRA_REP_RCVD:
3216         case IB_CM_ESTABLISHED:
3217                 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3218                                 IB_QP_PKEY_INDEX | IB_QP_PORT;
3219                 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
3220                 if (cm_id_priv->responder_resources)
3221                         qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3222                                                     IB_ACCESS_REMOTE_ATOMIC;
3223                 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3224                 qp_attr->port_num = cm_id_priv->av.port->port_num;
3225                 ret = 0;
3226                 break;
3227         default:
3228                 ret = -EINVAL;
3229                 break;
3230         }
3231         spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3232         return ret;
3233 }
3234
3235 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3236                                struct ib_qp_attr *qp_attr,
3237                                int *qp_attr_mask)
3238 {
3239         unsigned long flags;
3240         int ret;
3241
3242         spin_lock_irqsave(&cm_id_priv->lock, flags);
3243         switch (cm_id_priv->id.state) {
3244         case IB_CM_REQ_RCVD:
3245         case IB_CM_MRA_REQ_SENT:
3246         case IB_CM_REP_RCVD:
3247         case IB_CM_MRA_REP_SENT:
3248         case IB_CM_REP_SENT:
3249         case IB_CM_MRA_REP_RCVD:
3250         case IB_CM_ESTABLISHED:
3251                 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3252                                 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3253                 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3254                 qp_attr->path_mtu = cm_id_priv->path_mtu;
3255                 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3256                 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3257                 if (cm_id_priv->qp_type == IB_QPT_RC) {
3258                         *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3259                                          IB_QP_MIN_RNR_TIMER;
3260                         qp_attr->max_dest_rd_atomic =
3261                                         cm_id_priv->responder_resources;
3262                         qp_attr->min_rnr_timer = 0;
3263                 }
3264                 if (cm_id_priv->alt_av.ah_attr.dlid) {