1 /*
2 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved.
3 * Copyright (c) 2004 Topspin Corporation. All rights reserved.
4 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved.
5 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 */
35
36 #include <linux/completion.h>
37 #include <linux/dma-mapping.h>
38 #include <linux/device.h>
39 #include <linux/module.h>
40 #include <linux/err.h>
41 #include <linux/idr.h>
42 #include <linux/interrupt.h>
43 #include <linux/random.h>
44 #include <linux/rbtree.h>
45 #include <linux/spinlock.h>
46 #include <linux/slab.h>
47 #include <linux/sysfs.h>
48 #include <linux/workqueue.h>
49 #include <linux/kdev_t.h>
50 #include <linux/etherdevice.h>
51
52 #include <rdma/ib_cache.h>
53 #include <rdma/ib_cm.h>
54 #include "cm_msgs.h"
55
56 MODULE_AUTHOR("Sean Hefty");
57 MODULE_DESCRIPTION("InfiniBand CM");
58 MODULE_LICENSE("Dual BSD/GPL");
59
60 static const char * const ibcm_rej_reason_strs[] = {
61 [IB_CM_REJ_NO_QP] = "no QP",
62 [IB_CM_REJ_NO_EEC] = "no EEC",
63 [IB_CM_REJ_NO_RESOURCES] = "no resources",
64 [IB_CM_REJ_TIMEOUT] = "timeout",
65 [IB_CM_REJ_UNSUPPORTED] = "unsupported",
66 [IB_CM_REJ_INVALID_COMM_ID] = "invalid comm ID",
67 [IB_CM_REJ_INVALID_COMM_INSTANCE] = "invalid comm instance",
68 [IB_CM_REJ_INVALID_SERVICE_ID] = "invalid service ID",
69 [IB_CM_REJ_INVALID_TRANSPORT_TYPE] = "invalid transport type",
70 [IB_CM_REJ_STALE_CONN] = "stale conn",
71 [IB_CM_REJ_RDC_NOT_EXIST] = "RDC not exist",
72 [IB_CM_REJ_INVALID_GID] = "invalid GID",
73 [IB_CM_REJ_INVALID_LID] = "invalid LID",
74 [IB_CM_REJ_INVALID_SL] = "invalid SL",
75 [IB_CM_REJ_INVALID_TRAFFIC_CLASS] = "invalid traffic class",
76 [IB_CM_REJ_INVALID_HOP_LIMIT] = "invalid hop limit",
77 [IB_CM_REJ_INVALID_PACKET_RATE] = "invalid packet rate",
78 [IB_CM_REJ_INVALID_ALT_GID] = "invalid alt GID",
79 [IB_CM_REJ_INVALID_ALT_LID] = "invalid alt LID",
80 [IB_CM_REJ_INVALID_ALT_SL] = "invalid alt SL",
81 [IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS] = "invalid alt traffic class",
82 [IB_CM_REJ_INVALID_ALT_HOP_LIMIT] = "invalid alt hop limit",
83 [IB_CM_REJ_INVALID_ALT_PACKET_RATE] = "invalid alt packet rate",
84 [IB_CM_REJ_PORT_CM_REDIRECT] = "port CM redirect",
85 [IB_CM_REJ_PORT_REDIRECT] = "port redirect",
86 [IB_CM_REJ_INVALID_MTU] = "invalid MTU",
87 [IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES] = "insufficient resp resources",
88 [IB_CM_REJ_CONSUMER_DEFINED] = "consumer defined",
89 [IB_CM_REJ_INVALID_RNR_RETRY] = "invalid RNR retry",
90 [IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID] = "duplicate local comm ID",
91 [IB_CM_REJ_INVALID_CLASS_VERSION] = "invalid class version",
92 [IB_CM_REJ_INVALID_FLOW_LABEL] = "invalid flow label",
93 [IB_CM_REJ_INVALID_ALT_FLOW_LABEL] = "invalid alt flow label",
94 };
95
ibcm_reject_msg(int reason)96 const char *__attribute_const__ ibcm_reject_msg(int reason)
97 {
98 size_t index = reason;
99
100 if (index < ARRAY_SIZE(ibcm_rej_reason_strs) &&
101 ibcm_rej_reason_strs[index])
102 return ibcm_rej_reason_strs[index];
103 else
104 return "unrecognized reason";
105 }
106 EXPORT_SYMBOL(ibcm_reject_msg);
107
108 static void cm_add_one(struct ib_device *device);
109 static void cm_remove_one(struct ib_device *device, void *client_data);
110
111 static struct ib_client cm_client = {
112 .name = "cm",
113 .add = cm_add_one,
114 .remove = cm_remove_one
115 };
116
117 static struct ib_cm {
118 spinlock_t lock;
119 struct list_head device_list;
120 rwlock_t device_lock;
121 struct rb_root listen_service_table;
122 u64 listen_service_id;
123 /* struct rb_root peer_service_table; todo: fix peer to peer */
124 struct rb_root remote_qp_table;
125 struct rb_root remote_id_table;
126 struct rb_root remote_sidr_table;
127 struct idr local_id_table;
128 __be32 random_id_operand;
129 struct list_head timewait_list;
130 struct workqueue_struct *wq;
131 /* Sync on cm change port state */
132 spinlock_t state_lock;
133 } cm;
134
135 /* Counter indexes ordered by attribute ID */
136 enum {
137 CM_REQ_COUNTER,
138 CM_MRA_COUNTER,
139 CM_REJ_COUNTER,
140 CM_REP_COUNTER,
141 CM_RTU_COUNTER,
142 CM_DREQ_COUNTER,
143 CM_DREP_COUNTER,
144 CM_SIDR_REQ_COUNTER,
145 CM_SIDR_REP_COUNTER,
146 CM_LAP_COUNTER,
147 CM_APR_COUNTER,
148 CM_ATTR_COUNT,
149 CM_ATTR_ID_OFFSET = 0x0010,
150 };
151
152 enum {
153 CM_XMIT,
154 CM_XMIT_RETRIES,
155 CM_RECV,
156 CM_RECV_DUPLICATES,
157 CM_COUNTER_GROUPS
158 };
159
160 static char const counter_group_names[CM_COUNTER_GROUPS]
161 [sizeof("cm_rx_duplicates")] = {
162 "cm_tx_msgs", "cm_tx_retries",
163 "cm_rx_msgs", "cm_rx_duplicates"
164 };
165
166 struct cm_counter_group {
167 struct kobject obj;
168 atomic_long_t counter[CM_ATTR_COUNT];
169 };
170
171 struct cm_counter_attribute {
172 struct attribute attr;
173 int index;
174 };
175
176 #define CM_COUNTER_ATTR(_name, _index) \
177 struct cm_counter_attribute cm_##_name##_counter_attr = { \
178 .attr = { .name = __stringify(_name), .mode = 0444 }, \
179 .index = _index \
180 }
181
182 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
183 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
184 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
185 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
186 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
187 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
188 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
189 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
190 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
191 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
192 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
193
194 static struct attribute *cm_counter_default_attrs[] = {
195 &cm_req_counter_attr.attr,
196 &cm_mra_counter_attr.attr,
197 &cm_rej_counter_attr.attr,
198 &cm_rep_counter_attr.attr,
199 &cm_rtu_counter_attr.attr,
200 &cm_dreq_counter_attr.attr,
201 &cm_drep_counter_attr.attr,
202 &cm_sidr_req_counter_attr.attr,
203 &cm_sidr_rep_counter_attr.attr,
204 &cm_lap_counter_attr.attr,
205 &cm_apr_counter_attr.attr,
206 NULL
207 };
208
209 struct cm_port {
210 struct cm_device *cm_dev;
211 struct ib_mad_agent *mad_agent;
212 struct kobject port_obj;
213 u8 port_num;
214 struct list_head cm_priv_prim_list;
215 struct list_head cm_priv_altr_list;
216 struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
217 };
218
219 struct cm_device {
220 struct list_head list;
221 struct ib_device *ib_device;
222 struct device *device;
223 u8 ack_delay;
224 int going_down;
225 struct cm_port *port[0];
226 };
227
228 struct cm_av {
229 struct cm_port *port;
230 union ib_gid dgid;
231 struct rdma_ah_attr ah_attr;
232 u16 pkey_index;
233 u8 timeout;
234 };
235
236 struct cm_work {
237 struct delayed_work work;
238 struct list_head list;
239 struct cm_port *port;
240 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
241 __be32 local_id; /* Established / timewait */
242 __be32 remote_id;
243 struct ib_cm_event cm_event;
244 struct sa_path_rec path[0];
245 };
246
247 struct cm_timewait_info {
248 struct cm_work work; /* Must be first. */
249 struct list_head list;
250 struct rb_node remote_qp_node;
251 struct rb_node remote_id_node;
252 __be64 remote_ca_guid;
253 __be32 remote_qpn;
254 u8 inserted_remote_qp;
255 u8 inserted_remote_id;
256 };
257
258 struct cm_id_private {
259 struct ib_cm_id id;
260
261 struct rb_node service_node;
262 struct rb_node sidr_id_node;
263 spinlock_t lock; /* Do not acquire inside cm.lock */
264 struct completion comp;
265 atomic_t refcount;
266 /* Number of clients sharing this ib_cm_id. Only valid for listeners.
267 * Protected by the cm.lock spinlock. */
268 int listen_sharecount;
269
270 struct ib_mad_send_buf *msg;
271 struct cm_timewait_info *timewait_info;
272 /* todo: use alternate port on send failure */
273 struct cm_av av;
274 struct cm_av alt_av;
275
276 void *private_data;
277 __be64 tid;
278 __be32 local_qpn;
279 __be32 remote_qpn;
280 enum ib_qp_type qp_type;
281 __be32 sq_psn;
282 __be32 rq_psn;
283 int timeout_ms;
284 enum ib_mtu path_mtu;
285 __be16 pkey;
286 u8 private_data_len;
287 u8 max_cm_retries;
288 u8 peer_to_peer;
289 u8 responder_resources;
290 u8 initiator_depth;
291 u8 retry_count;
292 u8 rnr_retry_count;
293 u8 service_timeout;
294 u8 target_ack_delay;
295
296 struct list_head prim_list;
297 struct list_head altr_list;
298 /* Indicates that the send port mad is registered and av is set */
299 int prim_send_port_not_ready;
300 int altr_send_port_not_ready;
301
302 struct list_head work_list;
303 atomic_t work_count;
304 };
305
306 static void cm_work_handler(struct work_struct *work);
307
cm_deref_id(struct cm_id_private * cm_id_priv)308 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
309 {
310 if (atomic_dec_and_test(&cm_id_priv->refcount))
311 complete(&cm_id_priv->comp);
312 }
313
cm_alloc_msg(struct cm_id_private * cm_id_priv,struct ib_mad_send_buf ** msg)314 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
315 struct ib_mad_send_buf **msg)
316 {
317 struct ib_mad_agent *mad_agent;
318 struct ib_mad_send_buf *m;
319 struct ib_ah *ah;
320 struct cm_av *av;
321 unsigned long flags, flags2;
322 int ret = 0;
323
324 /* don't let the port to be released till the agent is down */
325 spin_lock_irqsave(&cm.state_lock, flags2);
326 spin_lock_irqsave(&cm.lock, flags);
327 if (!cm_id_priv->prim_send_port_not_ready)
328 av = &cm_id_priv->av;
329 else if (!cm_id_priv->altr_send_port_not_ready &&
330 (cm_id_priv->alt_av.port))
331 av = &cm_id_priv->alt_av;
332 else {
333 pr_info("%s: not valid CM id\n", __func__);
334 ret = -ENODEV;
335 spin_unlock_irqrestore(&cm.lock, flags);
336 goto out;
337 }
338 spin_unlock_irqrestore(&cm.lock, flags);
339 /* Make sure the port haven't released the mad yet */
340 mad_agent = cm_id_priv->av.port->mad_agent;
341 if (!mad_agent) {
342 pr_info("%s: not a valid MAD agent\n", __func__);
343 ret = -ENODEV;
344 goto out;
345 }
346 ah = rdma_create_ah(mad_agent->qp->pd, &av->ah_attr);
347 if (IS_ERR(ah)) {
348 ret = PTR_ERR(ah);
349 goto out;
350 }
351
352 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
353 av->pkey_index,
354 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
355 GFP_ATOMIC,
356 IB_MGMT_BASE_VERSION);
357 if (IS_ERR(m)) {
358 rdma_destroy_ah(ah);
359 ret = PTR_ERR(m);
360 goto out;
361 }
362
363 /* Timeout set by caller if response is expected. */
364 m->ah = ah;
365 m->retries = cm_id_priv->max_cm_retries;
366
367 atomic_inc(&cm_id_priv->refcount);
368 m->context[0] = cm_id_priv;
369 *msg = m;
370
371 out:
372 spin_unlock_irqrestore(&cm.state_lock, flags2);
373 return ret;
374 }
375
cm_alloc_response_msg_no_ah(struct cm_port * port,struct ib_mad_recv_wc * mad_recv_wc)376 static struct ib_mad_send_buf *cm_alloc_response_msg_no_ah(struct cm_port *port,
377 struct ib_mad_recv_wc *mad_recv_wc)
378 {
379 return ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
380 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
381 GFP_ATOMIC,
382 IB_MGMT_BASE_VERSION);
383 }
384
cm_create_response_msg_ah(struct cm_port * port,struct ib_mad_recv_wc * mad_recv_wc,struct ib_mad_send_buf * msg)385 static int cm_create_response_msg_ah(struct cm_port *port,
386 struct ib_mad_recv_wc *mad_recv_wc,
387 struct ib_mad_send_buf *msg)
388 {
389 struct ib_ah *ah;
390
391 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
392 mad_recv_wc->recv_buf.grh, port->port_num);
393 if (IS_ERR(ah))
394 return PTR_ERR(ah);
395
396 msg->ah = ah;
397 return 0;
398 }
399
cm_free_msg(struct ib_mad_send_buf * msg)400 static void cm_free_msg(struct ib_mad_send_buf *msg)
401 {
402 if (msg->ah)
403 rdma_destroy_ah(msg->ah);
404 if (msg->context[0])
405 cm_deref_id(msg->context[0]);
406 ib_free_send_mad(msg);
407 }
408
cm_alloc_response_msg(struct cm_port * port,struct ib_mad_recv_wc * mad_recv_wc,struct ib_mad_send_buf ** msg)409 static int cm_alloc_response_msg(struct cm_port *port,
410 struct ib_mad_recv_wc *mad_recv_wc,
411 struct ib_mad_send_buf **msg)
412 {
413 struct ib_mad_send_buf *m;
414 int ret;
415
416 m = cm_alloc_response_msg_no_ah(port, mad_recv_wc);
417 if (IS_ERR(m))
418 return PTR_ERR(m);
419
420 ret = cm_create_response_msg_ah(port, mad_recv_wc, m);
421 if (ret) {
422 cm_free_msg(m);
423 return ret;
424 }
425
426 *msg = m;
427 return 0;
428 }
429
cm_copy_private_data(const void * private_data,u8 private_data_len)430 static void * cm_copy_private_data(const void *private_data,
431 u8 private_data_len)
432 {
433 void *data;
434
435 if (!private_data || !private_data_len)
436 return NULL;
437
438 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
439 if (!data)
440 return ERR_PTR(-ENOMEM);
441
442 return data;
443 }
444
cm_set_private_data(struct cm_id_private * cm_id_priv,void * private_data,u8 private_data_len)445 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
446 void *private_data, u8 private_data_len)
447 {
448 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
449 kfree(cm_id_priv->private_data);
450
451 cm_id_priv->private_data = private_data;
452 cm_id_priv->private_data_len = private_data_len;
453 }
454
cm_init_av_for_lap(struct cm_port * port,struct ib_wc * wc,struct ib_grh * grh,struct cm_av * av)455 static int cm_init_av_for_lap(struct cm_port *port, struct ib_wc *wc,
456 struct ib_grh *grh, struct cm_av *av)
457 {
458 struct rdma_ah_attr new_ah_attr;
459 int ret;
460
461 av->port = port;
462 av->pkey_index = wc->pkey_index;
463
464 /*
465 * av->ah_attr might be initialized based on past wc during incoming
466 * connect request or while sending out connect request. So initialize
467 * a new ah_attr on stack. If initialization fails, old ah_attr is
468 * used for sending any responses. If initialization is successful,
469 * than new ah_attr is used by overwriting old one.
470 */
471 ret = ib_init_ah_attr_from_wc(port->cm_dev->ib_device,
472 port->port_num, wc,
473 grh, &new_ah_attr);
474 if (ret)
475 return ret;
476
477 rdma_move_ah_attr(&av->ah_attr, &new_ah_attr);
478 return 0;
479 }
480
cm_init_av_for_response(struct cm_port * port,struct ib_wc * wc,struct ib_grh * grh,struct cm_av * av)481 static int cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
482 struct ib_grh *grh, struct cm_av *av)
483 {
484 av->port = port;
485 av->pkey_index = wc->pkey_index;
486 return ib_init_ah_attr_from_wc(port->cm_dev->ib_device,
487 port->port_num, wc,
488 grh, &av->ah_attr);
489 }
490
add_cm_id_to_port_list(struct cm_id_private * cm_id_priv,struct cm_av * av,struct cm_port * port)491 static int add_cm_id_to_port_list(struct cm_id_private *cm_id_priv,
492 struct cm_av *av,
493 struct cm_port *port)
494 {
495 unsigned long flags;
496 int ret = 0;
497
498 spin_lock_irqsave(&cm.lock, flags);
499
500 if (&cm_id_priv->av == av)
501 list_add_tail(&cm_id_priv->prim_list, &port->cm_priv_prim_list);
502 else if (&cm_id_priv->alt_av == av)
503 list_add_tail(&cm_id_priv->altr_list, &port->cm_priv_altr_list);
504 else
505 ret = -EINVAL;
506
507 spin_unlock_irqrestore(&cm.lock, flags);
508 return ret;
509 }
510
511 static struct cm_port *
get_cm_port_from_path(struct sa_path_rec * path,const struct ib_gid_attr * attr)512 get_cm_port_from_path(struct sa_path_rec *path, const struct ib_gid_attr *attr)
513 {
514 struct cm_device *cm_dev;
515 struct cm_port *port = NULL;
516 unsigned long flags;
517
518 if (attr) {
519 read_lock_irqsave(&cm.device_lock, flags);
520 list_for_each_entry(cm_dev, &cm.device_list, list) {
521 if (cm_dev->ib_device == attr->device) {
522 port = cm_dev->port[attr->port_num - 1];
523 break;
524 }
525 }
526 read_unlock_irqrestore(&cm.device_lock, flags);
527 } else {
528 /* SGID attribute can be NULL in following
529 * conditions.
530 * (a) Alternative path
531 * (b) IB link layer without GRH
532 * (c) LAP send messages
533 */
534 read_lock_irqsave(&cm.device_lock, flags);
535 list_for_each_entry(cm_dev, &cm.device_list, list) {
536 attr = rdma_find_gid(cm_dev->ib_device,
537 &path->sgid,
538 sa_conv_pathrec_to_gid_type(path),
539 NULL);
540 if (!IS_ERR(attr)) {
541 port = cm_dev->port[attr->port_num - 1];
542 break;
543 }
544 }
545 read_unlock_irqrestore(&cm.device_lock, flags);
546 if (port)
547 rdma_put_gid_attr(attr);
548 }
549 return port;
550 }
551
cm_init_av_by_path(struct sa_path_rec * path,const struct ib_gid_attr * sgid_attr,struct cm_av * av,struct cm_id_private * cm_id_priv)552 static int cm_init_av_by_path(struct sa_path_rec *path,
553 const struct ib_gid_attr *sgid_attr,
554 struct cm_av *av,
555 struct cm_id_private *cm_id_priv)
556 {
557 struct rdma_ah_attr new_ah_attr;
558 struct cm_device *cm_dev;
559 struct cm_port *port;
560 int ret;
561
562 port = get_cm_port_from_path(path, sgid_attr);
563 if (!port)
564 return -EINVAL;
565 cm_dev = port->cm_dev;
566
567 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
568 be16_to_cpu(path->pkey), &av->pkey_index);
569 if (ret)
570 return ret;
571
572 av->port = port;
573
574 /*
575 * av->ah_attr might be initialized based on wc or during
576 * request processing time which might have reference to sgid_attr.
577 * So initialize a new ah_attr on stack.
578 * If initialization fails, old ah_attr is used for sending any
579 * responses. If initialization is successful, than new ah_attr
580 * is used by overwriting the old one. So that right ah_attr
581 * can be used to return an error response.
582 */
583 ret = ib_init_ah_attr_from_path(cm_dev->ib_device, port->port_num, path,
584 &new_ah_attr, sgid_attr);
585 if (ret)
586 return ret;
587
588 av->timeout = path->packet_life_time + 1;
589
590 ret = add_cm_id_to_port_list(cm_id_priv, av, port);
591 if (ret) {
592 rdma_destroy_ah_attr(&new_ah_attr);
593 return ret;
594 }
595 rdma_move_ah_attr(&av->ah_attr, &new_ah_attr);
596 return 0;
597 }
598
cm_alloc_id(struct cm_id_private * cm_id_priv)599 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
600 {
601 unsigned long flags;
602 int id;
603
604 idr_preload(GFP_KERNEL);
605 spin_lock_irqsave(&cm.lock, flags);
606
607 id = idr_alloc_cyclic(&cm.local_id_table, cm_id_priv, 0, 0, GFP_NOWAIT);
608
609 spin_unlock_irqrestore(&cm.lock, flags);
610 idr_preload_end();
611
612 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
613 return id < 0 ? id : 0;
614 }
615
cm_free_id(__be32 local_id)616 static void cm_free_id(__be32 local_id)
617 {
618 spin_lock_irq(&cm.lock);
619 idr_remove(&cm.local_id_table,
620 (__force int) (local_id ^ cm.random_id_operand));
621 spin_unlock_irq(&cm.lock);
622 }
623
cm_get_id(__be32 local_id,__be32 remote_id)624 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
625 {
626 struct cm_id_private *cm_id_priv;
627
628 cm_id_priv = idr_find(&cm.local_id_table,
629 (__force int) (local_id ^ cm.random_id_operand));
630 if (cm_id_priv) {
631 if (cm_id_priv->id.remote_id == remote_id)
632 atomic_inc(&cm_id_priv->refcount);
633 else
634 cm_id_priv = NULL;
635 }
636
637 return cm_id_priv;
638 }
639
cm_acquire_id(__be32 local_id,__be32 remote_id)640 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
641 {
642 struct cm_id_private *cm_id_priv;
643
644 spin_lock_irq(&cm.lock);
645 cm_id_priv = cm_get_id(local_id, remote_id);
646 spin_unlock_irq(&cm.lock);
647
648 return cm_id_priv;
649 }
650
651 /*
652 * Trivial helpers to strip endian annotation and compare; the
653 * endianness doesn't actually matter since we just need a stable
654 * order for the RB tree.
655 */
be32_lt(__be32 a,__be32 b)656 static int be32_lt(__be32 a, __be32 b)
657 {
658 return (__force u32) a < (__force u32) b;
659 }
660
be32_gt(__be32 a,__be32 b)661 static int be32_gt(__be32 a, __be32 b)
662 {
663 return (__force u32) a > (__force u32) b;
664 }
665
be64_lt(__be64 a,__be64 b)666 static int be64_lt(__be64 a, __be64 b)
667 {
668 return (__force u64) a < (__force u64) b;
669 }
670
be64_gt(__be64 a,__be64 b)671 static int be64_gt(__be64 a, __be64 b)
672 {
673 return (__force u64) a > (__force u64) b;
674 }
675
cm_insert_listen(struct cm_id_private * cm_id_priv)676 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
677 {
678 struct rb_node **link = &cm.listen_service_table.rb_node;
679 struct rb_node *parent = NULL;
680 struct cm_id_private *cur_cm_id_priv;
681 __be64 service_id = cm_id_priv->id.service_id;
682 __be64 service_mask = cm_id_priv->id.service_mask;
683
684 while (*link) {
685 parent = *link;
686 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
687 service_node);
688 if ((cur_cm_id_priv->id.service_mask & service_id) ==
689 (service_mask & cur_cm_id_priv->id.service_id) &&
690 (cm_id_priv->id.device == cur_cm_id_priv->id.device))
691 return cur_cm_id_priv;
692
693 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
694 link = &(*link)->rb_left;
695 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
696 link = &(*link)->rb_right;
697 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
698 link = &(*link)->rb_left;
699 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
700 link = &(*link)->rb_right;
701 else
702 link = &(*link)->rb_right;
703 }
704 rb_link_node(&cm_id_priv->service_node, parent, link);
705 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
706 return NULL;
707 }
708
cm_find_listen(struct ib_device * device,__be64 service_id)709 static struct cm_id_private * cm_find_listen(struct ib_device *device,
710 __be64 service_id)
711 {
712 struct rb_node *node = cm.listen_service_table.rb_node;
713 struct cm_id_private *cm_id_priv;
714
715 while (node) {
716 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
717 if ((cm_id_priv->id.service_mask & service_id) ==
718 cm_id_priv->id.service_id &&
719 (cm_id_priv->id.device == device))
720 return cm_id_priv;
721
722 if (device < cm_id_priv->id.device)
723 node = node->rb_left;
724 else if (device > cm_id_priv->id.device)
725 node = node->rb_right;
726 else if (be64_lt(service_id, cm_id_priv->id.service_id))
727 node = node->rb_left;
728 else if (be64_gt(service_id, cm_id_priv->id.service_id))
729 node = node->rb_right;
730 else
731 node = node->rb_right;
732 }
733 return NULL;
734 }
735
cm_insert_remote_id(struct cm_timewait_info * timewait_info)736 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
737 *timewait_info)
738 {
739 struct rb_node **link = &cm.remote_id_table.rb_node;
740 struct rb_node *parent = NULL;
741 struct cm_timewait_info *cur_timewait_info;
742 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
743 __be32 remote_id = timewait_info->work.remote_id;
744
745 while (*link) {
746 parent = *link;
747 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
748 remote_id_node);
749 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
750 link = &(*link)->rb_left;
751 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
752 link = &(*link)->rb_right;
753 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
754 link = &(*link)->rb_left;
755 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
756 link = &(*link)->rb_right;
757 else
758 return cur_timewait_info;
759 }
760 timewait_info->inserted_remote_id = 1;
761 rb_link_node(&timewait_info->remote_id_node, parent, link);
762 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
763 return NULL;
764 }
765
cm_find_remote_id(__be64 remote_ca_guid,__be32 remote_id)766 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
767 __be32 remote_id)
768 {
769 struct rb_node *node = cm.remote_id_table.rb_node;
770 struct cm_timewait_info *timewait_info;
771
772 while (node) {
773 timewait_info = rb_entry(node, struct cm_timewait_info,
774 remote_id_node);
775 if (be32_lt(remote_id, timewait_info->work.remote_id))
776 node = node->rb_left;
777 else if (be32_gt(remote_id, timewait_info->work.remote_id))
778 node = node->rb_right;
779 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
780 node = node->rb_left;
781 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
782 node = node->rb_right;
783 else
784 return timewait_info;
785 }
786 return NULL;
787 }
788
cm_insert_remote_qpn(struct cm_timewait_info * timewait_info)789 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
790 *timewait_info)
791 {
792 struct rb_node **link = &cm.remote_qp_table.rb_node;
793 struct rb_node *parent = NULL;
794 struct cm_timewait_info *cur_timewait_info;
795 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
796 __be32 remote_qpn = timewait_info->remote_qpn;
797
798 while (*link) {
799 parent = *link;
800 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
801 remote_qp_node);
802 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
803 link = &(*link)->rb_left;
804 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
805 link = &(*link)->rb_right;
806 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
807 link = &(*link)->rb_left;
808 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
809 link = &(*link)->rb_right;
810 else
811 return cur_timewait_info;
812 }
813 timewait_info->inserted_remote_qp = 1;
814 rb_link_node(&timewait_info->remote_qp_node, parent, link);
815 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
816 return NULL;
817 }
818
cm_insert_remote_sidr(struct cm_id_private * cm_id_priv)819 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
820 *cm_id_priv)
821 {
822 struct rb_node **link = &cm.remote_sidr_table.rb_node;
823 struct rb_node *parent = NULL;
824 struct cm_id_private *cur_cm_id_priv;
825 union ib_gid *port_gid = &cm_id_priv->av.dgid;
826 __be32 remote_id = cm_id_priv->id.remote_id;
827
828 while (*link) {
829 parent = *link;
830 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
831 sidr_id_node);
832 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
833 link = &(*link)->rb_left;
834 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
835 link = &(*link)->rb_right;
836 else {
837 int cmp;
838 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
839 sizeof *port_gid);
840 if (cmp < 0)
841 link = &(*link)->rb_left;
842 else if (cmp > 0)
843 link = &(*link)->rb_right;
844 else
845 return cur_cm_id_priv;
846 }
847 }
848 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
849 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
850 return NULL;
851 }
852
cm_reject_sidr_req(struct cm_id_private * cm_id_priv,enum ib_cm_sidr_status status)853 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
854 enum ib_cm_sidr_status status)
855 {
856 struct ib_cm_sidr_rep_param param;
857
858 memset(¶m, 0, sizeof param);
859 param.status = status;
860 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m);
861 }
862
ib_create_cm_id(struct ib_device * device,ib_cm_handler cm_handler,void * context)863 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
864 ib_cm_handler cm_handler,
865 void *context)
866 {
867 struct cm_id_private *cm_id_priv;
868 int ret;
869
870 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
871 if (!cm_id_priv)
872 return ERR_PTR(-ENOMEM);
873
874 cm_id_priv->id.state = IB_CM_IDLE;
875 cm_id_priv->id.device = device;
876 cm_id_priv->id.cm_handler = cm_handler;
877 cm_id_priv->id.context = context;
878 cm_id_priv->id.remote_cm_qpn = 1;
879 ret = cm_alloc_id(cm_id_priv);
880 if (ret)
881 goto error;
882
883 spin_lock_init(&cm_id_priv->lock);
884 init_completion(&cm_id_priv->comp);
885 INIT_LIST_HEAD(&cm_id_priv->work_list);
886 INIT_LIST_HEAD(&cm_id_priv->prim_list);
887 INIT_LIST_HEAD(&cm_id_priv->altr_list);
888 atomic_set(&cm_id_priv->work_count, -1);
889 atomic_set(&cm_id_priv->refcount, 1);
890 return &cm_id_priv->id;
891
892 error:
893 kfree(cm_id_priv);
894 return ERR_PTR(-ENOMEM);
895 }
896 EXPORT_SYMBOL(ib_create_cm_id);
897
cm_dequeue_work(struct cm_id_private * cm_id_priv)898 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
899 {
900 struct cm_work *work;
901
902 if (list_empty(&cm_id_priv->work_list))
903 return NULL;
904
905 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
906 list_del(&work->list);
907 return work;
908 }
909
cm_free_work(struct cm_work * work)910 static void cm_free_work(struct cm_work *work)
911 {
912 if (work->mad_recv_wc)
913 ib_free_recv_mad(work->mad_recv_wc);
914 kfree(work);
915 }
916
cm_convert_to_ms(int iba_time)917 static inline int cm_convert_to_ms(int iba_time)
918 {
919 /* approximate conversion to ms from 4.096us x 2^iba_time */
920 return 1 << max(iba_time - 8, 0);
921 }
922
923 /*
924 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
925 * Because of how ack_timeout is stored, adding one doubles the timeout.
926 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
927 * increment it (round up) only if the other is within 50%.
928 */
cm_ack_timeout(u8 ca_ack_delay,u8 packet_life_time)929 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
930 {
931 int ack_timeout = packet_life_time + 1;
932
933 if (ack_timeout >= ca_ack_delay)
934 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
935 else
936 ack_timeout = ca_ack_delay +
937 (ack_timeout >= (ca_ack_delay - 1));
938
939 return min(31, ack_timeout);
940 }
941
cm_cleanup_timewait(struct cm_timewait_info * timewait_info)942 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
943 {
944 if (timewait_info->inserted_remote_id) {
945 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
946 timewait_info->inserted_remote_id = 0;
947 }
948
949 if (timewait_info->inserted_remote_qp) {
950 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
951 timewait_info->inserted_remote_qp = 0;
952 }
953 }
954
cm_create_timewait_info(__be32 local_id)955 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
956 {
957 struct cm_timewait_info *timewait_info;
958
959 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
960 if (!timewait_info)
961 return ERR_PTR(-ENOMEM);
962
963 timewait_info->work.local_id = local_id;
964 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
965 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
966 return timewait_info;
967 }
968
cm_enter_timewait(struct cm_id_private * cm_id_priv)969 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
970 {
971 int wait_time;
972 unsigned long flags;
973 struct cm_device *cm_dev;
974
975 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client);
976 if (!cm_dev)
977 return;
978
979 spin_lock_irqsave(&cm.lock, flags);
980 cm_cleanup_timewait(cm_id_priv->timewait_info);
981 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
982 spin_unlock_irqrestore(&cm.lock, flags);
983
984 /*
985 * The cm_id could be destroyed by the user before we exit timewait.
986 * To protect against this, we search for the cm_id after exiting
987 * timewait before notifying the user that we've exited timewait.
988 */
989 cm_id_priv->id.state = IB_CM_TIMEWAIT;
990 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
991
992 /* Check if the device started its remove_one */
993 spin_lock_irqsave(&cm.lock, flags);
994 if (!cm_dev->going_down)
995 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
996 msecs_to_jiffies(wait_time));
997 spin_unlock_irqrestore(&cm.lock, flags);
998
999 cm_id_priv->timewait_info = NULL;
1000 }
1001
cm_reset_to_idle(struct cm_id_private * cm_id_priv)1002 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
1003 {
1004 unsigned long flags;
1005
1006 cm_id_priv->id.state = IB_CM_IDLE;
1007 if (cm_id_priv->timewait_info) {
1008 spin_lock_irqsave(&cm.lock, flags);
1009 cm_cleanup_timewait(cm_id_priv->timewait_info);
1010 spin_unlock_irqrestore(&cm.lock, flags);
1011 kfree(cm_id_priv->timewait_info);
1012 cm_id_priv->timewait_info = NULL;
1013 }
1014 }
1015
cm_destroy_id(struct ib_cm_id * cm_id,int err)1016 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
1017 {
1018 struct cm_id_private *cm_id_priv;
1019 struct cm_work *work;
1020
1021 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1022 retest:
1023 spin_lock_irq(&cm_id_priv->lock);
1024 switch (cm_id->state) {
1025 case IB_CM_LISTEN:
1026 spin_unlock_irq(&cm_id_priv->lock);
1027
1028 spin_lock_irq(&cm.lock);
1029 if (--cm_id_priv->listen_sharecount > 0) {
1030 /* The id is still shared. */
1031 cm_deref_id(cm_id_priv);
1032 spin_unlock_irq(&cm.lock);
1033 return;
1034 }
1035 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
1036 spin_unlock_irq(&cm.lock);
1037 break;
1038 case IB_CM_SIDR_REQ_SENT:
1039 cm_id->state = IB_CM_IDLE;
1040 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1041 spin_unlock_irq(&cm_id_priv->lock);
1042 break;
1043 case IB_CM_SIDR_REQ_RCVD:
1044 spin_unlock_irq(&cm_id_priv->lock);
1045 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
1046 spin_lock_irq(&cm.lock);
1047 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node))
1048 rb_erase(&cm_id_priv->sidr_id_node,
1049 &cm.remote_sidr_table);
1050 spin_unlock_irq(&cm.lock);
1051 break;
1052 case IB_CM_REQ_SENT:
1053 case IB_CM_MRA_REQ_RCVD:
1054 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1055 spin_unlock_irq(&cm_id_priv->lock);
1056 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
1057 &cm_id_priv->id.device->node_guid,
1058 sizeof cm_id_priv->id.device->node_guid,
1059 NULL, 0);
1060 break;
1061 case IB_CM_REQ_RCVD:
1062 if (err == -ENOMEM) {
1063 /* Do not reject to allow future retries. */
1064 cm_reset_to_idle(cm_id_priv);
1065 spin_unlock_irq(&cm_id_priv->lock);
1066 } else {
1067 spin_unlock_irq(&cm_id_priv->lock);
1068 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1069 NULL, 0, NULL, 0);
1070 }
1071 break;
1072 case IB_CM_REP_SENT:
1073 case IB_CM_MRA_REP_RCVD:
1074 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1075 /* Fall through */
1076 case IB_CM_MRA_REQ_SENT:
1077 case IB_CM_REP_RCVD:
1078 case IB_CM_MRA_REP_SENT:
1079 spin_unlock_irq(&cm_id_priv->lock);
1080 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1081 NULL, 0, NULL, 0);
1082 break;
1083 case IB_CM_ESTABLISHED:
1084 spin_unlock_irq(&cm_id_priv->lock);
1085 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT)
1086 break;
1087 ib_send_cm_dreq(cm_id, NULL, 0);
1088 goto retest;
1089 case IB_CM_DREQ_SENT:
1090 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1091 cm_enter_timewait(cm_id_priv);
1092 spin_unlock_irq(&cm_id_priv->lock);
1093 break;
1094 case IB_CM_DREQ_RCVD:
1095 spin_unlock_irq(&cm_id_priv->lock);
1096 ib_send_cm_drep(cm_id, NULL, 0);
1097 break;
1098 default:
1099 spin_unlock_irq(&cm_id_priv->lock);
1100 break;
1101 }
1102
1103 spin_lock_irq(&cm.lock);
1104 if (!list_empty(&cm_id_priv->altr_list) &&
1105 (!cm_id_priv->altr_send_port_not_ready))
1106 list_del(&cm_id_priv->altr_list);
1107 if (!list_empty(&cm_id_priv->prim_list) &&
1108 (!cm_id_priv->prim_send_port_not_ready))
1109 list_del(&cm_id_priv->prim_list);
1110 spin_unlock_irq(&cm.lock);
1111
1112 cm_free_id(cm_id->local_id);
1113 cm_deref_id(cm_id_priv);
1114 wait_for_completion(&cm_id_priv->comp);
1115 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
1116 cm_free_work(work);
1117
1118 rdma_destroy_ah_attr(&cm_id_priv->av.ah_attr);
1119 rdma_destroy_ah_attr(&cm_id_priv->alt_av.ah_attr);
1120 kfree(cm_id_priv->private_data);
1121 kfree(cm_id_priv);
1122 }
1123
ib_destroy_cm_id(struct ib_cm_id * cm_id)1124 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
1125 {
1126 cm_destroy_id(cm_id, 0);
1127 }
1128 EXPORT_SYMBOL(ib_destroy_cm_id);
1129
1130 /**
1131 * __ib_cm_listen - Initiates listening on the specified service ID for
1132 * connection and service ID resolution requests.
1133 * @cm_id: Connection identifier associated with the listen request.
1134 * @service_id: Service identifier matched against incoming connection
1135 * and service ID resolution requests. The service ID should be specified
1136 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1137 * assign a service ID to the caller.
1138 * @service_mask: Mask applied to service ID used to listen across a
1139 * range of service IDs. If set to 0, the service ID is matched
1140 * exactly. This parameter is ignored if %service_id is set to
1141 * IB_CM_ASSIGN_SERVICE_ID.
1142 */
__ib_cm_listen(struct ib_cm_id * cm_id,__be64 service_id,__be64 service_mask)1143 static int __ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id,
1144 __be64 service_mask)
1145 {
1146 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
1147 int ret = 0;
1148
1149 service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
1150 service_id &= service_mask;
1151 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
1152 (service_id != IB_CM_ASSIGN_SERVICE_ID))
1153 return -EINVAL;
1154
1155 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1156 if (cm_id->state != IB_CM_IDLE)
1157 return -EINVAL;
1158
1159 cm_id->state = IB_CM_LISTEN;
1160 ++cm_id_priv->listen_sharecount;
1161
1162 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
1163 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
1164 cm_id->service_mask = ~cpu_to_be64(0);
1165 } else {
1166 cm_id->service_id = service_id;
1167 cm_id->service_mask = service_mask;
1168 }
1169 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
1170
1171 if (cur_cm_id_priv) {
1172 cm_id->state = IB_CM_IDLE;
1173 --cm_id_priv->listen_sharecount;
1174 ret = -EBUSY;
1175 }
1176 return ret;
1177 }
1178
ib_cm_listen(struct ib_cm_id * cm_id,__be64 service_id,__be64 service_mask)1179 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask)
1180 {
1181 unsigned long flags;
1182 int ret;
1183
1184 spin_lock_irqsave(&cm.lock, flags);
1185 ret = __ib_cm_listen(cm_id, service_id, service_mask);
1186 spin_unlock_irqrestore(&cm.lock, flags);
1187
1188 return ret;
1189 }
1190 EXPORT_SYMBOL(ib_cm_listen);
1191
1192 /**
1193 * Create a new listening ib_cm_id and listen on the given service ID.
1194 *
1195 * If there's an existing ID listening on that same device and service ID,
1196 * return it.
1197 *
1198 * @device: Device associated with the cm_id. All related communication will
1199 * be associated with the specified device.
1200 * @cm_handler: Callback invoked to notify the user of CM events.
1201 * @service_id: Service identifier matched against incoming connection
1202 * and service ID resolution requests. The service ID should be specified
1203 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1204 * assign a service ID to the caller.
1205 *
1206 * Callers should call ib_destroy_cm_id when done with the listener ID.
1207 */
ib_cm_insert_listen(struct ib_device * device,ib_cm_handler cm_handler,__be64 service_id)1208 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device,
1209 ib_cm_handler cm_handler,
1210 __be64 service_id)
1211 {
1212 struct cm_id_private *cm_id_priv;
1213 struct ib_cm_id *cm_id;
1214 unsigned long flags;
1215 int err = 0;
1216
1217 /* Create an ID in advance, since the creation may sleep */
1218 cm_id = ib_create_cm_id(device, cm_handler, NULL);
1219 if (IS_ERR(cm_id))
1220 return cm_id;
1221
1222 spin_lock_irqsave(&cm.lock, flags);
1223
1224 if (service_id == IB_CM_ASSIGN_SERVICE_ID)
1225 goto new_id;
1226
1227 /* Find an existing ID */
1228 cm_id_priv = cm_find_listen(device, service_id);
1229 if (cm_id_priv) {
1230 if (cm_id->cm_handler != cm_handler || cm_id->context) {
1231 /* Sharing an ib_cm_id with different handlers is not
1232 * supported */
1233 spin_unlock_irqrestore(&cm.lock, flags);
1234 return ERR_PTR(-EINVAL);
1235 }
1236 atomic_inc(&cm_id_priv->refcount);
1237 ++cm_id_priv->listen_sharecount;
1238 spin_unlock_irqrestore(&cm.lock, flags);
1239
1240 ib_destroy_cm_id(cm_id);
1241 cm_id = &cm_id_priv->id;
1242 return cm_id;
1243 }
1244
1245 new_id:
1246 /* Use newly created ID */
1247 err = __ib_cm_listen(cm_id, service_id, 0);
1248
1249 spin_unlock_irqrestore(&cm.lock, flags);
1250
1251 if (err) {
1252 ib_destroy_cm_id(cm_id);
1253 return ERR_PTR(err);
1254 }
1255 return cm_id;
1256 }
1257 EXPORT_SYMBOL(ib_cm_insert_listen);
1258
cm_form_tid(struct cm_id_private * cm_id_priv)1259 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv)
1260 {
1261 u64 hi_tid, low_tid;
1262
1263 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
1264 low_tid = (u64)cm_id_priv->id.local_id;
1265 return cpu_to_be64(hi_tid | low_tid);
1266 }
1267
cm_format_mad_hdr(struct ib_mad_hdr * hdr,__be16 attr_id,__be64 tid)1268 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
1269 __be16 attr_id, __be64 tid)
1270 {
1271 hdr->base_version = IB_MGMT_BASE_VERSION;
1272 hdr->mgmt_class = IB_MGMT_CLASS_CM;
1273 hdr->class_version = IB_CM_CLASS_VERSION;
1274 hdr->method = IB_MGMT_METHOD_SEND;
1275 hdr->attr_id = attr_id;
1276 hdr->tid = tid;
1277 }
1278
cm_format_req(struct cm_req_msg * req_msg,struct cm_id_private * cm_id_priv,struct ib_cm_req_param * param)1279 static void cm_format_req(struct cm_req_msg *req_msg,
1280 struct cm_id_private *cm_id_priv,
1281 struct ib_cm_req_param *param)
1282 {
1283 struct sa_path_rec *pri_path = param->primary_path;
1284 struct sa_path_rec *alt_path = param->alternate_path;
1285 bool pri_ext = false;
1286
1287 if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA)
1288 pri_ext = opa_is_extended_lid(pri_path->opa.dlid,
1289 pri_path->opa.slid);
1290
1291 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1292 cm_form_tid(cm_id_priv));
1293
1294 req_msg->local_comm_id = cm_id_priv->id.local_id;
1295 req_msg->service_id = param->service_id;
1296 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1297 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
1298 cm_req_set_init_depth(req_msg, param->initiator_depth);
1299 cm_req_set_remote_resp_timeout(req_msg,
1300 param->remote_cm_response_timeout);
1301 cm_req_set_qp_type(req_msg, param->qp_type);
1302 cm_req_set_flow_ctrl(req_msg, param->flow_control);
1303 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
1304 cm_req_set_local_resp_timeout(req_msg,
1305 param->local_cm_response_timeout);
1306 req_msg->pkey = param->primary_path->pkey;
1307 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
1308 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
1309
1310 if (param->qp_type != IB_QPT_XRC_INI) {
1311 cm_req_set_resp_res(req_msg, param->responder_resources);
1312 cm_req_set_retry_count(req_msg, param->retry_count);
1313 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
1314 cm_req_set_srq(req_msg, param->srq);
1315 }
1316
1317 req_msg->primary_local_gid = pri_path->sgid;
1318 req_msg->primary_remote_gid = pri_path->dgid;
1319 if (pri_ext) {
1320 req_msg->primary_local_gid.global.interface_id
1321 = OPA_MAKE_ID(be32_to_cpu(pri_path->opa.slid));
1322 req_msg->primary_remote_gid.global.interface_id
1323 = OPA_MAKE_ID(be32_to_cpu(pri_path->opa.dlid));
1324 }
1325 if (pri_path->hop_limit <= 1) {
1326 req_msg->primary_local_lid = pri_ext ? 0 :
1327 htons(ntohl(sa_path_get_slid(pri_path)));
1328 req_msg->primary_remote_lid = pri_ext ? 0 :
1329 htons(ntohl(sa_path_get_dlid(pri_path)));
1330 } else {
1331 /* Work-around until there's a way to obtain remote LID info */
1332 req_msg->primary_local_lid = IB_LID_PERMISSIVE;
1333 req_msg->primary_remote_lid = IB_LID_PERMISSIVE;
1334 }
1335 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label);
1336 cm_req_set_primary_packet_rate(req_msg, pri_path->rate);
1337 req_msg->primary_traffic_class = pri_path->traffic_class;
1338 req_msg->primary_hop_limit = pri_path->hop_limit;
1339 cm_req_set_primary_sl(req_msg, pri_path->sl);
1340 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1));
1341 cm_req_set_primary_local_ack_timeout(req_msg,
1342 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1343 pri_path->packet_life_time));
1344
1345 if (alt_path) {
1346 bool alt_ext = false;
1347
1348 if (alt_path->rec_type == SA_PATH_REC_TYPE_OPA)
1349 alt_ext = opa_is_extended_lid(alt_path->opa.dlid,
1350 alt_path->opa.slid);
1351
1352 req_msg->alt_local_gid = alt_path->sgid;
1353 req_msg->alt_remote_gid = alt_path->dgid;
1354 if (alt_ext) {
1355 req_msg->alt_local_gid.global.interface_id
1356 = OPA_MAKE_ID(be32_to_cpu(alt_path->opa.slid));
1357 req_msg->alt_remote_gid.global.interface_id
1358 = OPA_MAKE_ID(be32_to_cpu(alt_path->opa.dlid));
1359 }
1360 if (alt_path->hop_limit <= 1) {
1361 req_msg->alt_local_lid = alt_ext ? 0 :
1362 htons(ntohl(sa_path_get_slid(alt_path)));
1363 req_msg->alt_remote_lid = alt_ext ? 0 :
1364 htons(ntohl(sa_path_get_dlid(alt_path)));
1365 } else {
1366 req_msg->alt_local_lid = IB_LID_PERMISSIVE;
1367 req_msg->alt_remote_lid = IB_LID_PERMISSIVE;
1368 }
1369 cm_req_set_alt_flow_label(req_msg,
1370 alt_path->flow_label);
1371 cm_req_set_alt_packet_rate(req_msg, alt_path->rate);
1372 req_msg->alt_traffic_class = alt_path->traffic_class;
1373 req_msg->alt_hop_limit = alt_path->hop_limit;
1374 cm_req_set_alt_sl(req_msg, alt_path->sl);
1375 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1));
1376 cm_req_set_alt_local_ack_timeout(req_msg,
1377 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1378 alt_path->packet_life_time));
1379 }
1380
1381 if (param->private_data && param->private_data_len)
1382 memcpy(req_msg->private_data, param->private_data,
1383 param->private_data_len);
1384 }
1385
cm_validate_req_param(struct ib_cm_req_param * param)1386 static int cm_validate_req_param(struct ib_cm_req_param *param)
1387 {
1388 /* peer-to-peer not supported */
1389 if (param->peer_to_peer)
1390 return -EINVAL;
1391
1392 if (!param->primary_path)
1393 return -EINVAL;
1394
1395 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
1396 param->qp_type != IB_QPT_XRC_INI)
1397 return -EINVAL;
1398
1399 if (param->private_data &&
1400 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1401 return -EINVAL;
1402
1403 if (param->alternate_path &&
1404 (param->alternate_path->pkey != param->primary_path->pkey ||
1405 param->alternate_path->mtu != param->primary_path->mtu))
1406 return -EINVAL;
1407
1408 return 0;
1409 }
1410
ib_send_cm_req(struct ib_cm_id * cm_id,struct ib_cm_req_param * param)1411 int ib_send_cm_req(struct ib_cm_id *cm_id,
1412 struct ib_cm_req_param *param)
1413 {
1414 struct cm_id_private *cm_id_priv;
1415 struct cm_req_msg *req_msg;
1416 unsigned long flags;
1417 int ret;
1418
1419 ret = cm_validate_req_param(param);
1420 if (ret)
1421 return ret;
1422
1423 /* Verify that we're not in timewait. */
1424 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1425 spin_lock_irqsave(&cm_id_priv->lock, flags);
1426 if (cm_id->state != IB_CM_IDLE) {
1427 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1428 ret = -EINVAL;
1429 goto out;
1430 }
1431 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1432
1433 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1434 id.local_id);
1435 if (IS_ERR(cm_id_priv->timewait_info)) {
1436 ret = PTR_ERR(cm_id_priv->timewait_info);
1437 goto out;
1438 }
1439
1440 ret = cm_init_av_by_path(param->primary_path,
1441 param->ppath_sgid_attr, &cm_id_priv->av,
1442 cm_id_priv);
1443 if (ret)
1444 goto error1;
1445 if (param->alternate_path) {
1446 ret = cm_init_av_by_path(param->alternate_path, NULL,
1447 &cm_id_priv->alt_av, cm_id_priv);
1448 if (ret)
1449 goto error1;
1450 }
1451 cm_id->service_id = param->service_id;
1452 cm_id->service_mask = ~cpu_to_be64(0);
1453 cm_id_priv->timeout_ms = cm_convert_to_ms(
1454 param->primary_path->packet_life_time) * 2 +
1455 cm_convert_to_ms(
1456 param->remote_cm_response_timeout);
1457 cm_id_priv->max_cm_retries = param->max_cm_retries;
1458 cm_id_priv->initiator_depth = param->initiator_depth;
1459 cm_id_priv->responder_resources = param->responder_resources;
1460 cm_id_priv->retry_count = param->retry_count;
1461 cm_id_priv->path_mtu = param->primary_path->mtu;
1462 cm_id_priv->pkey = param->primary_path->pkey;
1463 cm_id_priv->qp_type = param->qp_type;
1464
1465 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1466 if (ret)
1467 goto error1;
1468
1469 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1470 cm_format_req(req_msg, cm_id_priv, param);
1471 cm_id_priv->tid = req_msg->hdr.tid;
1472 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1473 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1474
1475 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1476 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1477
1478 spin_lock_irqsave(&cm_id_priv->lock, flags);
1479 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1480 if (ret) {
1481 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1482 goto error2;
1483 }
1484 BUG_ON(cm_id->state != IB_CM_IDLE);
1485 cm_id->state = IB_CM_REQ_SENT;
1486 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1487 return 0;
1488
1489 error2: cm_free_msg(cm_id_priv->msg);
1490 error1: kfree(cm_id_priv->timewait_info);
1491 out: return ret;
1492 }
1493 EXPORT_SYMBOL(ib_send_cm_req);
1494
cm_issue_rej(struct cm_port * port,struct ib_mad_recv_wc * mad_recv_wc,enum ib_cm_rej_reason reason,enum cm_msg_response msg_rejected,void * ari,u8 ari_length)1495 static int cm_issue_rej(struct cm_port *port,
1496 struct ib_mad_recv_wc *mad_recv_wc,
1497 enum ib_cm_rej_reason reason,
1498 enum cm_msg_response msg_rejected,
1499 void *ari, u8 ari_length)
1500 {
1501 struct ib_mad_send_buf *msg = NULL;
1502 struct cm_rej_msg *rej_msg, *rcv_msg;
1503 int ret;
1504
1505 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1506 if (ret)
1507 return ret;
1508
1509 /* We just need common CM header information. Cast to any message. */
1510 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1511 rej_msg = (struct cm_rej_msg *) msg->mad;
1512
1513 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1514 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1515 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1516 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1517 rej_msg->reason = cpu_to_be16(reason);
1518
1519 if (ari && ari_length) {
1520 cm_rej_set_reject_info_len(rej_msg, ari_length);
1521 memcpy(rej_msg->ari, ari, ari_length);
1522 }
1523
1524 ret = ib_post_send_mad(msg, NULL);
1525 if (ret)
1526 cm_free_msg(msg);
1527
1528 return ret;
1529 }
1530
cm_is_active_peer(__be64 local_ca_guid,__be64 remote_ca_guid,__be32 local_qpn,__be32 remote_qpn)1531 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1532 __be32 local_qpn, __be32 remote_qpn)
1533 {
1534 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1535 ((local_ca_guid == remote_ca_guid) &&
1536 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1537 }
1538
cm_req_has_alt_path(struct cm_req_msg * req_msg)1539 static bool cm_req_has_alt_path(struct cm_req_msg *req_msg)
1540 {
1541 return ((req_msg->alt_local_lid) ||
1542 (ib_is_opa_gid(&req_msg->alt_local_gid)));
1543 }
1544
cm_path_set_rec_type(struct ib_device * ib_device,u8 port_num,struct sa_path_rec * path,union ib_gid * gid)1545 static void cm_path_set_rec_type(struct ib_device *ib_device, u8 port_num,
1546 struct sa_path_rec *path, union ib_gid *gid)
1547 {
1548 if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num))
1549 path->rec_type = SA_PATH_REC_TYPE_OPA;
1550 else
1551 path->rec_type = SA_PATH_REC_TYPE_IB;
1552 }
1553
cm_format_path_lid_from_req(struct cm_req_msg * req_msg,struct sa_path_rec * primary_path,struct sa_path_rec * alt_path)1554 static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg,
1555 struct sa_path_rec *primary_path,
1556 struct sa_path_rec *alt_path)
1557 {
1558 u32 lid;
1559
1560 if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1561 sa_path_set_dlid(primary_path,
1562 ntohs(req_msg->primary_local_lid));
1563 sa_path_set_slid(primary_path,
1564 ntohs(req_msg->primary_remote_lid));
1565 } else {
1566 lid = opa_get_lid_from_gid(&req_msg->primary_local_gid);
1567 sa_path_set_dlid(primary_path, lid);
1568
1569 lid = opa_get_lid_from_gid(&req_msg->primary_remote_gid);
1570 sa_path_set_slid(primary_path, lid);
1571 }
1572
1573 if (!cm_req_has_alt_path(req_msg))
1574 return;
1575
1576 if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1577 sa_path_set_dlid(alt_path, ntohs(req_msg->alt_local_lid));
1578 sa_path_set_slid(alt_path, ntohs(req_msg->alt_remote_lid));
1579 } else {
1580 lid = opa_get_lid_from_gid(&req_msg->alt_local_gid);
1581 sa_path_set_dlid(alt_path, lid);
1582
1583 lid = opa_get_lid_from_gid(&req_msg->alt_remote_gid);
1584 sa_path_set_slid(alt_path, lid);
1585 }
1586 }
1587
cm_format_paths_from_req(struct cm_req_msg * req_msg,struct sa_path_rec * primary_path,struct sa_path_rec * alt_path)1588 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1589 struct sa_path_rec *primary_path,
1590 struct sa_path_rec *alt_path)
1591 {
1592 primary_path->dgid = req_msg->primary_local_gid;
1593 primary_path->sgid = req_msg->primary_remote_gid;
1594 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1595 primary_path->hop_limit = req_msg->primary_hop_limit;
1596 primary_path->traffic_class = req_msg->primary_traffic_class;
1597 primary_path->reversible = 1;
1598 primary_path->pkey = req_msg->pkey;
1599 primary_path->sl = cm_req_get_primary_sl(req_msg);
1600 primary_path->mtu_selector = IB_SA_EQ;
1601 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1602 primary_path->rate_selector = IB_SA_EQ;
1603 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1604 primary_path->packet_life_time_selector = IB_SA_EQ;
1605 primary_path->packet_life_time =
1606 cm_req_get_primary_local_ack_timeout(req_msg);
1607 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1608 primary_path->service_id = req_msg->service_id;
1609 if (sa_path_is_roce(primary_path))
1610 primary_path->roce.route_resolved = false;
1611
1612 if (cm_req_has_alt_path(req_msg)) {
1613 alt_path->dgid = req_msg->alt_local_gid;
1614 alt_path->sgid = req_msg->alt_remote_gid;
1615 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1616 alt_path->hop_limit = req_msg->alt_hop_limit;
1617 alt_path->traffic_class = req_msg->alt_traffic_class;
1618 alt_path->reversible = 1;
1619 alt_path->pkey = req_msg->pkey;
1620 alt_path->sl = cm_req_get_alt_sl(req_msg);
1621 alt_path->mtu_selector = IB_SA_EQ;
1622 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1623 alt_path->rate_selector = IB_SA_EQ;
1624 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1625 alt_path->packet_life_time_selector = IB_SA_EQ;
1626 alt_path->packet_life_time =
1627 cm_req_get_alt_local_ack_timeout(req_msg);
1628 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1629 alt_path->service_id = req_msg->service_id;
1630
1631 if (sa_path_is_roce(alt_path))
1632 alt_path->roce.route_resolved = false;
1633 }
1634 cm_format_path_lid_from_req(req_msg, primary_path, alt_path);
1635 }
1636
cm_get_bth_pkey(struct cm_work * work)1637 static u16 cm_get_bth_pkey(struct cm_work *work)
1638 {
1639 struct ib_device *ib_dev = work->port->cm_dev->ib_device;
1640 u8 port_num = work->port->port_num;
1641 u16 pkey_index = work->mad_recv_wc->wc->pkey_index;
1642 u16 pkey;
1643 int ret;
1644
1645 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey);
1646 if (ret) {
1647 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n",
1648 port_num, pkey_index, ret);
1649 return 0;
1650 }
1651
1652 return pkey;
1653 }
1654
1655 /**
1656 * Convert OPA SGID to IB SGID
1657 * ULPs (such as IPoIB) do not understand OPA GIDs and will
1658 * reject them as the local_gid will not match the sgid. Therefore,
1659 * change the pathrec's SGID to an IB SGID.
1660 *
1661 * @work: Work completion
1662 * @path: Path record
1663 */
cm_opa_to_ib_sgid(struct cm_work * work,struct sa_path_rec * path)1664 static void cm_opa_to_ib_sgid(struct cm_work *work,
1665 struct sa_path_rec *path)
1666 {
1667 struct ib_device *dev = work->port->cm_dev->ib_device;
1668 u8 port_num = work->port->port_num;
1669
1670 if (rdma_cap_opa_ah(dev, port_num) &&
1671 (ib_is_opa_gid(&path->sgid))) {
1672 union ib_gid sgid;
1673
1674 if (rdma_query_gid(dev, port_num, 0, &sgid)) {
1675 dev_warn(&dev->dev,
1676 "Error updating sgid in CM request\n");
1677 return;
1678 }
1679
1680 path->sgid = sgid;
1681 }
1682 }
1683
cm_format_req_event(struct cm_work * work,struct cm_id_private * cm_id_priv,struct ib_cm_id * listen_id)1684 static void cm_format_req_event(struct cm_work *work,
1685 struct cm_id_private *cm_id_priv,
1686 struct ib_cm_id *listen_id)
1687 {
1688 struct cm_req_msg *req_msg;
1689 struct ib_cm_req_event_param *param;
1690
1691 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1692 param = &work->cm_event.param.req_rcvd;
1693 param->listen_id = listen_id;
1694 param->bth_pkey = cm_get_bth_pkey(work);
1695 param->port = cm_id_priv->av.port->port_num;
1696 param->primary_path = &work->path[0];
1697 cm_opa_to_ib_sgid(work, param->primary_path);
1698 if (cm_req_has_alt_path(req_msg)) {
1699 param->alternate_path = &work->path[1];
1700 cm_opa_to_ib_sgid(work, param->alternate_path);
1701 } else {
1702 param->alternate_path = NULL;
1703 }
1704 param->remote_ca_guid = req_msg->local_ca_guid;
1705 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1706 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1707 param->qp_type = cm_req_get_qp_type(req_msg);
1708 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1709 param->responder_resources = cm_req_get_init_depth(req_msg);
1710 param->initiator_depth = cm_req_get_resp_res(req_msg);
1711 param->local_cm_response_timeout =
1712 cm_req_get_remote_resp_timeout(req_msg);
1713 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1714 param->remote_cm_response_timeout =
1715 cm_req_get_local_resp_timeout(req_msg);
1716 param->retry_count = cm_req_get_retry_count(req_msg);
1717 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1718 param->srq = cm_req_get_srq(req_msg);
1719 param->ppath_sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
1720 work->cm_event.private_data = &req_msg->private_data;
1721 }
1722
cm_process_work(struct cm_id_private * cm_id_priv,struct cm_work * work)1723 static void cm_process_work(struct cm_id_private *cm_id_priv,
1724 struct cm_work *work)
1725 {
1726 int ret;
1727
1728 /* We will typically only have the current event to report. */
1729 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1730 cm_free_work(work);
1731
1732 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1733 spin_lock_irq(&cm_id_priv->lock);
1734 work = cm_dequeue_work(cm_id_priv);
1735 spin_unlock_irq(&cm_id_priv->lock);
1736 if (!work)
1737 return;
1738
1739 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1740 &work->cm_event);
1741 cm_free_work(work);
1742 }
1743 cm_deref_id(cm_id_priv);
1744 if (ret)
1745 cm_destroy_id(&cm_id_priv->id, ret);
1746 }
1747
cm_format_mra(struct cm_mra_msg * mra_msg,struct cm_id_private * cm_id_priv,enum cm_msg_response msg_mraed,u8 service_timeout,const void * private_data,u8 private_data_len)1748 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1749 struct cm_id_private *cm_id_priv,
1750 enum cm_msg_response msg_mraed, u8 service_timeout,
1751 const void *private_data, u8 private_data_len)
1752 {
1753 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1754 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1755 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1756 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1757 cm_mra_set_service_timeout(mra_msg, service_timeout);
1758
1759 if (private_data && private_data_len)
1760 memcpy(mra_msg->private_data, private_data, private_data_len);
1761 }
1762
cm_format_rej(struct cm_rej_msg * rej_msg,struct cm_id_private * cm_id_priv,enum ib_cm_rej_reason reason,void * ari,u8 ari_length,const void * private_data,u8 private_data_len)1763 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1764 struct cm_id_private *cm_id_priv,
1765 enum ib_cm_rej_reason reason,
1766 void *ari,
1767 u8 ari_length,
1768 const void *private_data,
1769 u8 private_data_len)
1770 {
1771 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1772 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1773
1774 switch(cm_id_priv->id.state) {
1775 case IB_CM_REQ_RCVD:
1776 rej_msg->local_comm_id = 0;
1777 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1778 break;
1779 case IB_CM_MRA_REQ_SENT:
1780 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1781 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1782 break;
1783 case IB_CM_REP_RCVD:
1784 case IB_CM_MRA_REP_SENT:
1785 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1786 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1787 break;
1788 default:
1789 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1790 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1791 break;
1792 }
1793
1794 rej_msg->reason = cpu_to_be16(reason);
1795 if (ari && ari_length) {
1796 cm_rej_set_reject_info_len(rej_msg, ari_length);
1797 memcpy(rej_msg->ari, ari, ari_length);
1798 }
1799
1800 if (private_data && private_data_len)
1801 memcpy(rej_msg->private_data, private_data, private_data_len);
1802 }
1803
cm_dup_req_handler(struct cm_work * work,struct cm_id_private * cm_id_priv)1804 static void cm_dup_req_handler(struct cm_work *work,
1805 struct cm_id_private *cm_id_priv)
1806 {
1807 struct ib_mad_send_buf *msg = NULL;
1808 int ret;
1809
1810 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1811 counter[CM_REQ_COUNTER]);
1812
1813 /* Quick state check to discard duplicate REQs. */
1814 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1815 return;
1816
1817 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1818 if (ret)
1819 return;
1820
1821 spin_lock_irq(&cm_id_priv->lock);
1822 switch (cm_id_priv->id.state) {
1823 case IB_CM_MRA_REQ_SENT:
1824 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1825 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1826 cm_id_priv->private_data,
1827 cm_id_priv->private_data_len);
1828 break;
1829 case IB_CM_TIMEWAIT:
1830 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1831 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1832 break;
1833 default:
1834 goto unlock;
1835 }
1836 spin_unlock_irq(&cm_id_priv->lock);
1837
1838 ret = ib_post_send_mad(msg, NULL);
1839 if (ret)
1840 goto free;
1841 return;
1842
1843 unlock: spin_unlock_irq(&cm_id_priv->lock);
1844 free: cm_free_msg(msg);
1845 }
1846
cm_match_req(struct cm_work * work,struct cm_id_private * cm_id_priv)1847 static struct cm_id_private * cm_match_req(struct cm_work *work,
1848 struct cm_id_private *cm_id_priv)
1849 {
1850 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1851 struct cm_timewait_info *timewait_info;
1852 struct cm_req_msg *req_msg;
1853 struct ib_cm_id *cm_id;
1854
1855 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1856
1857 /* Check for possible duplicate REQ. */
1858 spin_lock_irq(&cm.lock);
1859 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1860 if (timewait_info) {
1861 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1862 timewait_info->work.remote_id);
1863 spin_unlock_irq(&cm.lock);
1864 if (cur_cm_id_priv) {
1865 cm_dup_req_handler(work, cur_cm_id_priv);
1866 cm_deref_id(cur_cm_id_priv);
1867 }
1868 return NULL;
1869 }
1870
1871 /* Check for stale connections. */
1872 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1873 if (timewait_info) {
1874 cm_cleanup_timewait(cm_id_priv->timewait_info);
1875 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1876 timewait_info->work.remote_id);
1877
1878 spin_unlock_irq(&cm.lock);
1879 cm_issue_rej(work->port, work->mad_recv_wc,
1880 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1881 NULL, 0);
1882 if (cur_cm_id_priv) {
1883 cm_id = &cur_cm_id_priv->id;
1884 ib_send_cm_dreq(cm_id, NULL, 0);
1885 cm_deref_id(cur_cm_id_priv);
1886 }
1887 return NULL;
1888 }
1889
1890 /* Find matching listen request. */
1891 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1892 req_msg->service_id);
1893 if (!listen_cm_id_priv) {
1894 cm_cleanup_timewait(cm_id_priv->timewait_info);
1895 spin_unlock_irq(&cm.lock);
1896 cm_issue_rej(work->port, work->mad_recv_wc,
1897 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1898 NULL, 0);
1899 goto out;
1900 }
1901 atomic_inc(&listen_cm_id_priv->refcount);
1902 atomic_inc(&cm_id_priv->refcount);
1903 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1904 atomic_inc(&cm_id_priv->work_count);
1905 spin_unlock_irq(&cm.lock);
1906 out:
1907 return listen_cm_id_priv;
1908 }
1909
1910 /*
1911 * Work-around for inter-subnet connections. If the LIDs are permissive,
1912 * we need to override the LID/SL data in the REQ with the LID information
1913 * in the work completion.
1914 */
cm_process_routed_req(struct cm_req_msg * req_msg,struct ib_wc * wc)1915 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
1916 {
1917 if (!cm_req_get_primary_subnet_local(req_msg)) {
1918 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) {
1919 req_msg->primary_local_lid = ib_lid_be16(wc->slid);
1920 cm_req_set_primary_sl(req_msg, wc->sl);
1921 }
1922
1923 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE)
1924 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1925 }
1926
1927 if (!cm_req_get_alt_subnet_local(req_msg)) {
1928 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) {
1929 req_msg->alt_local_lid = ib_lid_be16(wc->slid);
1930 cm_req_set_alt_sl(req_msg, wc->sl);
1931 }
1932
1933 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE)
1934 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1935 }
1936 }
1937
cm_req_handler(struct cm_work * work)1938 static int cm_req_handler(struct cm_work *work)
1939 {
1940 struct ib_cm_id *cm_id;
1941 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1942 struct cm_req_msg *req_msg;
1943 const struct ib_global_route *grh;
1944 const struct ib_gid_attr *gid_attr;
1945 int ret;
1946
1947 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1948
1949 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
1950 if (IS_ERR(cm_id))
1951 return PTR_ERR(cm_id);
1952
1953 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1954 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1955 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1956 work->mad_recv_wc->recv_buf.grh,
1957 &cm_id_priv->av);
1958 if (ret)
1959 goto destroy;
1960 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1961 id.local_id);
1962 if (IS_ERR(cm_id_priv->timewait_info)) {
1963 ret = PTR_ERR(cm_id_priv->timewait_info);
1964 goto destroy;
1965 }
1966 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1967 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1968 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1969
1970 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1971 if (!listen_cm_id_priv) {
1972 pr_debug("%s: local_id %d, no listen_cm_id_priv\n", __func__,
1973 be32_to_cpu(cm_id->local_id));
1974 ret = -EINVAL;
1975 goto free_timeinfo;
1976 }
1977
1978 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1979 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1980 cm_id_priv->id.service_id = req_msg->service_id;
1981 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
1982
1983 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
1984
1985 memset(&work->path[0], 0, sizeof(work->path[0]));
1986 if (cm_req_has_alt_path(req_msg))
1987 memset(&work->path[1], 0, sizeof(work->path[1]));
1988 grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr);
1989 gid_attr = grh->sgid_attr;
1990
1991 if (gid_attr && gid_attr->ndev) {
1992 work->path[0].rec_type =
1993 sa_conv_gid_to_pathrec_type(gid_attr->gid_type);
1994 } else {
1995 /* If no GID attribute or ndev is null, it is not RoCE. */
1996 cm_path_set_rec_type(work->port->cm_dev->ib_device,
1997 work->port->port_num,
1998 &work->path[0],
1999 &req_msg->primary_local_gid);
2000 }
2001 if (cm_req_has_alt_path(req_msg))
2002 work->path[1].rec_type = work->path[0].rec_type;
2003 cm_format_paths_from_req(req_msg, &work->path[0],
2004 &work->path[1]);
2005 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE)
2006 sa_path_set_dmac(&work->path[0],
2007 cm_id_priv->av.ah_attr.roce.dmac);
2008 work->path[0].hop_limit = grh->hop_limit;
2009 ret = cm_init_av_by_path(&work->path[0], gid_attr, &cm_id_priv->av,
2010 cm_id_priv);
2011 if (ret) {
2012 int err;
2013
2014 err = rdma_query_gid(work->port->cm_dev->ib_device,
2015 work->port->port_num, 0,
2016 &work->path[0].sgid);
2017 if (err)
2018 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
2019 NULL, 0, NULL, 0);
2020 else
2021 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
2022 &work->path[0].sgid,
2023 sizeof(work->path[0].sgid),
2024 NULL, 0);
2025 goto rejected;
2026 }
2027 if (cm_req_has_alt_path(req_msg)) {
2028 ret = cm_init_av_by_path(&work->path[1], NULL,
2029 &cm_id_priv->alt_av, cm_id_priv);
2030 if (ret) {
2031 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
2032 &work->path[0].sgid,
2033 sizeof(work->path[0].sgid), NULL, 0);
2034 goto rejected;
2035 }
2036 }
2037 cm_id_priv->tid = req_msg->hdr.tid;
2038 cm_id_priv->timeout_ms = cm_convert_to_ms(
2039 cm_req_get_local_resp_timeout(req_msg));
2040 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
2041 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
2042 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
2043 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
2044 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
2045 cm_id_priv->pkey = req_msg->pkey;
2046 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
2047 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
2048 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
2049 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
2050
2051 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
2052 cm_process_work(cm_id_priv, work);
2053 cm_deref_id(listen_cm_id_priv);
2054 return 0;
2055
2056 rejected:
2057 atomic_dec(&cm_id_priv->refcount);
2058 cm_deref_id(listen_cm_id_priv);
2059 free_timeinfo:
2060 kfree(cm_id_priv->timewait_info);
2061 destroy:
2062 ib_destroy_cm_id(cm_id);
2063 return ret;
2064 }
2065
cm_format_rep(struct cm_rep_msg * rep_msg,struct cm_id_private * cm_id_priv,struct ib_cm_rep_param * param)2066 static void cm_format_rep(struct cm_rep_msg *rep_msg,
2067 struct cm_id_private *cm_id_priv,
2068 struct ib_cm_rep_param *param)
2069 {
2070 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
2071 rep_msg->local_comm_id = cm_id_priv->id.local_id;
2072 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
2073 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
2074 rep_msg->resp_resources = param->responder_resources;
2075 cm_rep_set_target_ack_delay(rep_msg,
2076 cm_id_priv->av.port->cm_dev->ack_delay);
2077 cm_rep_set_failover(rep_msg, param->failover_accepted);
2078 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
2079 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
2080
2081 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
2082 rep_msg->initiator_depth = param->initiator_depth;
2083 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
2084 cm_rep_set_srq(rep_msg, param->srq);
2085 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
2086 } else {
2087 cm_rep_set_srq(rep_msg, 1);
2088 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num));
2089 }
2090
2091 if (param->private_data && param->private_data_len)
2092 memcpy(rep_msg->private_data, param->private_data,
2093 param->private_data_len);
2094 }
2095
ib_send_cm_rep(struct ib_cm_id * cm_id,struct ib_cm_rep_param * param)2096 int ib_send_cm_rep(struct ib_cm_id *cm_id,
2097 struct ib_cm_rep_param *param)
2098 {
2099 struct cm_id_private *cm_id_priv;
2100 struct ib_mad_send_buf *msg;
2101 struct cm_rep_msg *rep_msg;
2102 unsigned long flags;
2103 int ret;
2104
2105 if (param->private_data &&
2106 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
2107 return -EINVAL;
2108
2109 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2110 spin_lock_irqsave(&cm_id_priv->lock, flags);
2111 if (cm_id->state != IB_CM_REQ_RCVD &&
2112 cm_id->state != IB_CM_MRA_REQ_SENT) {
2113 pr_debug("%s: local_comm_id %d, cm_id->state: %d\n", __func__,
2114 be32_to_cpu(cm_id_priv->id.local_id), cm_id->state);
2115 ret = -EINVAL;
2116 goto out;
2117 }
2118
2119 ret = cm_alloc_msg(cm_id_priv, &msg);
2120 if (ret)
2121 goto out;
2122
2123 rep_msg = (struct cm_rep_msg *) msg->mad;
2124 cm_format_rep(rep_msg, cm_id_priv, param);
2125 msg->timeout_ms = cm_id_priv->timeout_ms;
2126 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
2127
2128 ret = ib_post_send_mad(msg, NULL);
2129 if (ret) {
2130 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2131 cm_free_msg(msg);
2132 return ret;
2133 }
2134
2135 cm_id->state = IB_CM_REP_SENT;
2136 cm_id_priv->msg = msg;
2137 cm_id_priv->initiator_depth = param->initiator_depth;
2138 cm_id_priv->responder_resources = param->responder_resources;
2139 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
2140 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
2141
2142 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2143 return ret;
2144 }
2145 EXPORT_SYMBOL(ib_send_cm_rep);
2146
cm_format_rtu(struct cm_rtu_msg * rtu_msg,struct cm_id_private * cm_id_priv,const void * private_data,u8 private_data_len)2147 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
2148 struct cm_id_private *cm_id_priv,
2149 const void *private_data,
2150 u8 private_data_len)
2151 {
2152 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
2153 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
2154 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
2155
2156 if (private_data && private_data_len)
2157 memcpy(rtu_msg->private_data, private_data, private_data_len);
2158 }
2159
ib_send_cm_rtu(struct ib_cm_id * cm_id,const void * private_data,u8 private_data_len)2160 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
2161 const void *private_data,
2162 u8 private_data_len)
2163 {
2164 struct cm_id_private *cm_id_priv;
2165 struct ib_mad_send_buf *msg;
2166 unsigned long flags;
2167 void *data;
2168 int ret;
2169
2170 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
2171 return -EINVAL;
2172
2173 data = cm_copy_private_data(private_data, private_data_len);
2174 if (IS_ERR(data))
2175 return PTR_ERR(data);
2176
2177 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2178 spin_lock_irqsave(&cm_id_priv->lock, flags);
2179 if (cm_id->state != IB_CM_REP_RCVD &&
2180 cm_id->state != IB_CM_MRA_REP_SENT) {
2181 pr_debug("%s: local_id %d, cm_id->state %d\n", __func__,
2182 be32_to_cpu(cm_id->local_id), cm_id->state);
2183 ret = -EINVAL;
2184 goto error;
2185 }
2186
2187 ret = cm_alloc_msg(cm_id_priv, &msg);
2188 if (ret)
2189 goto error;
2190
2191 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2192 private_data, private_data_len);
2193
2194 ret = ib_post_send_mad(msg, NULL);
2195 if (ret) {
2196 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2197 cm_free_msg(msg);
2198 kfree(data);
2199 return ret;
2200 }
2201
2202 cm_id->state = IB_CM_ESTABLISHED;
2203 cm_set_private_data(cm_id_priv, data, private_data_len);
2204 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2205 return 0;
2206
2207 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2208 kfree(data);
2209 return ret;
2210 }
2211 EXPORT_SYMBOL(ib_send_cm_rtu);
2212
cm_format_rep_event(struct cm_work * work,enum ib_qp_type qp_type)2213 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
2214 {
2215 struct cm_rep_msg *rep_msg;
2216 struct ib_cm_rep_event_param *param;
2217
2218 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2219 param = &work->cm_event.param.rep_rcvd;
2220 param->remote_ca_guid = rep_msg->local_ca_guid;
2221 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
2222 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
2223 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
2224 param->responder_resources = rep_msg->initiator_depth;
2225 param->initiator_depth = rep_msg->resp_resources;
2226 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
2227 param->failover_accepted = cm_rep_get_failover(rep_msg);
2228 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
2229 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
2230 param->srq = cm_rep_get_srq(rep_msg);
2231 work->cm_event.private_data = &rep_msg->private_data;
2232 }
2233
cm_dup_rep_handler(struct cm_work * work)2234 static void cm_dup_rep_handler(struct cm_work *work)
2235 {
2236 struct cm_id_private *cm_id_priv;
2237 struct cm_rep_msg *rep_msg;
2238 struct ib_mad_send_buf *msg = NULL;
2239 int ret;
2240
2241 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
2242 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
2243 rep_msg->local_comm_id);
2244 if (!cm_id_priv)
2245 return;
2246
2247 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2248 counter[CM_REP_COUNTER]);
2249 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
2250 if (ret)
2251 goto deref;
2252
2253 spin_lock_irq(&cm_id_priv->lock);
2254 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
2255 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2256 cm_id_priv->private_data,
2257 cm_id_priv->private_data_len);
2258 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
2259 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2260 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
2261 cm_id_priv->private_data,
2262 cm_id_priv->private_data_len);
2263 else
2264 goto unlock;
2265 spin_unlock_irq(&cm_id_priv->lock);
2266
2267 ret = ib_post_send_mad(msg, NULL);
2268 if (ret)
2269 goto free;
2270 goto deref;
2271
2272 unlock: spin_unlock_irq(&cm_id_priv->lock);
2273 free: cm_free_msg(msg);
2274 deref: cm_deref_id(cm_id_priv);
2275 }
2276
cm_rep_handler(struct cm_work * work)2277 static int cm_rep_handler(struct cm_work *work)
2278 {
2279 struct cm_id_private *cm_id_priv;
2280 struct cm_rep_msg *rep_msg;
2281 int ret;
2282 struct cm_id_private *cur_cm_id_priv;
2283 struct ib_cm_id *cm_id;
2284 struct cm_timewait_info *timewait_info;
2285
2286 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2287 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
2288 if (!cm_id_priv) {
2289 cm_dup_rep_handler(work);
2290 pr_debug("%s: remote_comm_id %d, no cm_id_priv\n", __func__,
2291 be32_to_cpu(rep_msg->remote_comm_id));
2292 return -EINVAL;
2293 }
2294
2295 cm_format_rep_event(work, cm_id_priv->qp_type);
2296
2297 spin_lock_irq(&cm_id_priv->lock);
2298 switch (cm_id_priv->id.state) {
2299 case IB_CM_REQ_SENT:
2300 case IB_CM_MRA_REQ_RCVD:
2301 break;
2302 default:
2303 spin_unlock_irq(&cm_id_priv->lock);
2304 ret = -EINVAL;
2305 pr_debug("%s: cm_id_priv->id.state: %d, local_comm_id %d, remote_comm_id %d\n",
2306 __func__, cm_id_priv->id.state,
2307 be32_to_cpu(rep_msg->local_comm_id),
2308 be32_to_cpu(rep_msg->remote_comm_id));
2309 goto error;
2310 }
2311
2312 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
2313 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
2314 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2315
2316 spin_lock(&cm.lock);
2317 /* Check for duplicate REP. */
2318 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
2319 spin_unlock(&cm.lock);
2320 spin_unlock_irq(&cm_id_priv->lock);
2321 ret = -EINVAL;
2322 pr_debug("%s: Failed to insert remote id %d\n", __func__,
2323 be32_to_cpu(rep_msg->remote_comm_id));
2324 goto error;
2325 }
2326 /* Check for a stale connection. */
2327 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
2328 if (timewait_info) {
2329 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
2330 &cm.remote_id_table);
2331 cm_id_priv->timewait_info->inserted_remote_id = 0;
2332 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
2333 timewait_info->work.remote_id);
2334
2335 spin_unlock(&cm.lock);
2336 spin_unlock_irq(&cm_id_priv->lock);
2337 cm_issue_rej(work->port, work->mad_recv_wc,
2338 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
2339 NULL, 0);
2340 ret = -EINVAL;
2341 pr_debug("%s: Stale connection. local_comm_id %d, remote_comm_id %d\n",
2342 __func__, be32_to_cpu(rep_msg->local_comm_id),
2343 be32_to_cpu(rep_msg->remote_comm_id));
2344
2345 if (cur_cm_id_priv) {
2346 cm_id = &cur_cm_id_priv->id;
2347 ib_send_cm_dreq(cm_id, NULL, 0);
2348 cm_deref_id(cur_cm_id_priv);
2349 }
2350
2351 goto error;
2352 }
2353 spin_unlock(&cm.lock);
2354
2355 cm_id_priv->id.state = IB_CM_REP_RCVD;
2356 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
2357 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2358 cm_id_priv->initiator_depth = rep_msg->resp_resources;
2359 cm_id_priv->responder_resources = rep_msg->initiator_depth;
2360 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
2361 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
2362 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
2363 cm_id_priv->av.timeout =
2364 cm_ack_timeout(cm_id_priv->target_ack_delay,
2365 cm_id_priv->av.timeout - 1);
2366 cm_id_priv->alt_av.timeout =
2367 cm_ack_timeout(cm_id_priv->target_ack_delay,
2368 cm_id_priv->alt_av.timeout - 1);
2369
2370 /* todo: handle peer_to_peer */
2371
2372 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2373 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2374 if (!ret)
2375 list_add_tail(&work->list, &cm_id_priv->work_list);
2376 spin_unlock_irq(&cm_id_priv->lock);
2377
2378 if (ret)
2379 cm_process_work(cm_id_priv, work);
2380 else
2381 cm_deref_id(cm_id_priv);
2382 return 0;
2383
2384 error:
2385 cm_deref_id(cm_id_priv);
2386 return ret;
2387 }
2388
cm_establish_handler(struct cm_work * work)2389 static int cm_establish_handler(struct cm_work *work)
2390 {
2391 struct cm_id_private *cm_id_priv;
2392 int ret;
2393
2394 /* See comment in cm_establish about lookup. */
2395 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
2396 if (!cm_id_priv)
2397 return -EINVAL;
2398
2399 spin_lock_irq(&cm_id_priv->lock);
2400 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
2401 spin_unlock_irq(&cm_id_priv->lock);
2402 goto out;
2403 }
2404
2405 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2406 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2407 if (!ret)
2408 list_add_tail(&work->list, &cm_id_priv->work_list);
2409 spin_unlock_irq(&cm_id_priv->lock);
2410
2411 if (ret)
2412 cm_process_work(cm_id_priv, work);
2413 else
2414 cm_deref_id(cm_id_priv);
2415 return 0;
2416 out:
2417 cm_deref_id(cm_id_priv);
2418 return -EINVAL;
2419 }
2420
cm_rtu_handler(struct cm_work * work)2421 static int cm_rtu_handler(struct cm_work *work)
2422 {
2423 struct cm_id_private *cm_id_priv;
2424 struct cm_rtu_msg *rtu_msg;
2425 int ret;
2426
2427 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
2428 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
2429 rtu_msg->local_comm_id);
2430 if (!cm_id_priv)
2431 return -EINVAL;
2432
2433 work->cm_event.private_data = &rtu_msg->private_data;
2434
2435 spin_lock_irq(&cm_id_priv->lock);
2436 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
2437 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
2438 spin_unlock_irq(&cm_id_priv->lock);
2439 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2440 counter[CM_RTU_COUNTER]);
2441 goto out;
2442 }
2443 cm_id_priv->id.state = IB_CM_ESTABLISHED;
2444
2445 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2446 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2447 if (!ret)
2448 list_add_tail(&work->list, &cm_id_priv->work_list);
2449 spin_unlock_irq(&cm_id_priv->lock);
2450
2451 if (ret)
2452 cm_process_work(cm_id_priv, work);
2453 else
2454 cm_deref_id(cm_id_priv);
2455 return 0;
2456 out:
2457 cm_deref_id(cm_id_priv);
2458 return -EINVAL;
2459 }
2460
cm_format_dreq(struct cm_dreq_msg * dreq_msg,struct cm_id_private * cm_id_priv,const void * private_data,u8 private_data_len)2461 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
2462 struct cm_id_private *cm_id_priv,
2463 const void *private_data,
2464 u8 private_data_len)
2465 {
2466 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
2467 cm_form_tid(cm_id_priv));
2468 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
2469 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
2470 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
2471
2472 if (private_data && private_data_len)
2473 memcpy(dreq_msg->private_data, private_data, private_data_len);
2474 }
2475
ib_send_cm_dreq(struct ib_cm_id * cm_id,const void * private_data,u8 private_data_len)2476 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
2477 const void *private_data,
2478 u8 private_data_len)
2479 {
2480 struct cm_id_private *cm_id_priv;
2481 struct ib_mad_send_buf *msg;
2482 unsigned long flags;
2483 int ret;
2484
2485 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
2486 return -EINVAL;
2487
2488 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2489 spin_lock_irqsave(&cm_id_priv->lock, flags);
2490 if (cm_id->state != IB_CM_ESTABLISHED) {
2491 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__,
2492 be32_to_cpu(cm_id->local_id), cm_id->state);
2493 ret = -EINVAL;
2494 goto out;
2495 }
2496
2497 if (cm_id->lap_state == IB_CM_LAP_SENT ||
2498 cm_id->lap_state == IB_CM_MRA_LAP_RCVD)
2499 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2500
2501 ret = cm_alloc_msg(cm_id_priv, &msg);
2502 if (ret) {
2503 cm_enter_timewait(cm_id_priv);
2504 goto out;
2505 }
2506
2507 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2508 private_data, private_data_len);
2509 msg->timeout_ms = cm_id_priv->timeout_ms;
2510 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2511
2512 ret = ib_post_send_mad(msg, NULL);
2513 if (ret) {
2514 cm_enter_timewait(cm_id_priv);
2515 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2516 cm_free_msg(msg);
2517 return ret;
2518 }
2519
2520 cm_id->state = IB_CM_DREQ_SENT;
2521 cm_id_priv->msg = msg;
2522 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2523 return ret;
2524 }
2525 EXPORT_SYMBOL(ib_send_cm_dreq);
2526
cm_format_drep(struct cm_drep_msg * drep_msg,struct cm_id_private * cm_id_priv,const void * private_data,u8 private_data_len)2527 static void cm_format_drep(struct cm_drep_msg *drep_msg,
2528 struct cm_id_private *cm_id_priv,
2529 const void *private_data,
2530 u8 private_data_len)
2531 {
2532 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2533 drep_msg->local_comm_id = cm_id_priv->id.local_id;
2534 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
2535
2536 if (private_data && private_data_len)
2537 memcpy(drep_msg->private_data, private_data, private_data_len);
2538 }
2539
ib_send_cm_drep(struct ib_cm_id * cm_id,const void * private_data,u8 private_data_len)2540 int ib_send_cm_drep(struct ib_cm_id *cm_id,
2541 const void *private_data,
2542 u8 private_data_len)
2543 {
2544 struct cm_id_private *cm_id_priv;
2545 struct ib_mad_send_buf *msg;
2546 unsigned long flags;
2547 void *data;
2548 int ret;
2549
2550 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2551 return -EINVAL;
2552
2553 data = cm_copy_private_data(private_data, private_data_len);
2554 if (IS_ERR(data))
2555 return PTR_ERR(data);
2556
2557 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2558 spin_lock_irqsave(&cm_id_priv->lock, flags);
2559 if (cm_id->state != IB_CM_DREQ_RCVD) {
2560 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2561 kfree(data);
2562 pr_debug("%s: local_id %d, cm_idcm_id->state(%d) != IB_CM_DREQ_RCVD\n",
2563 __func__, be32_to_cpu(cm_id->local_id), cm_id->state);
2564 return -EINVAL;
2565 }
2566
2567 cm_set_private_data(cm_id_priv, data, private_data_len);
2568 cm_enter_timewait(cm_id_priv);
2569
2570 ret = cm_alloc_msg(cm_id_priv, &msg);
2571 if (ret)
2572 goto out;
2573
2574 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2575 private_data, private_data_len);
2576
2577 ret = ib_post_send_mad(msg, NULL);
2578 if (ret) {
2579 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2580 cm_free_msg(msg);
2581 return ret;
2582 }
2583
2584 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2585 return ret;
2586 }
2587 EXPORT_SYMBOL(ib_send_cm_drep);
2588
cm_issue_drep(struct cm_port * port,struct ib_mad_recv_wc * mad_recv_wc)2589 static int cm_issue_drep(struct cm_port *port,
2590 struct ib_mad_recv_wc *mad_recv_wc)
2591 {
2592 struct ib_mad_send_buf *msg = NULL;
2593 struct cm_dreq_msg *dreq_msg;
2594 struct cm_drep_msg *drep_msg;
2595 int ret;
2596
2597 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2598 if (ret)
2599 return ret;
2600
2601 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2602 drep_msg = (struct cm_drep_msg *) msg->mad;
2603
2604 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2605 drep_msg->remote_comm_id = dreq_msg->local_comm_id;
2606 drep_msg->local_comm_id = dreq_msg->remote_comm_id;
2607
2608 ret = ib_post_send_mad(msg, NULL);
2609 if (ret)
2610 cm_free_msg(msg);
2611
2612 return ret;
2613 }
2614
cm_dreq_handler(struct cm_work * work)2615 static int cm_dreq_handler(struct cm_work *work)
2616 {
2617 struct cm_id_private *cm_id_priv;
2618 struct cm_dreq_msg *dreq_msg;
2619 struct ib_mad_send_buf *msg = NULL;
2620 int ret;
2621
2622 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2623 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
2624 dreq_msg->local_comm_id);
2625 if (!cm_id_priv) {
2626 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2627 counter[CM_DREQ_COUNTER]);
2628 cm_issue_drep(work->port, work->mad_recv_wc);
2629 pr_debug("%s: no cm_id_priv, local_comm_id %d, remote_comm_id %d\n",
2630 __func__, be32_to_cpu(dreq_msg->local_comm_id),
2631 be32_to_cpu(dreq_msg->remote_comm_id));
2632 return -EINVAL;
2633 }
2634
2635 work->cm_event.private_data = &dreq_msg->private_data;
2636
2637 spin_lock_irq(&cm_id_priv->lock);
2638 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
2639 goto unlock;
2640
2641 switch (cm_id_priv->id.state) {
2642 case IB_CM_REP_SENT:
2643 case IB_CM_DREQ_SENT:
2644 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2645 break;
2646 case IB_CM_ESTABLISHED:
2647 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2648 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2649 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2650 break;
2651 case IB_CM_MRA_REP_RCVD:
2652 break;
2653 case IB_CM_TIMEWAIT:
2654 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2655 counter[CM_DREQ_COUNTER]);
2656 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
2657 if (IS_ERR(msg))
2658 goto unlock;
2659
2660 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2661 cm_id_priv->private_data,
2662 cm_id_priv->private_data_len);
2663 spin_unlock_irq(&cm_id_priv->lock);
2664
2665 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
2666 ib_post_send_mad(msg, NULL))
2667 cm_free_msg(msg);
2668 goto deref;
2669 case IB_CM_DREQ_RCVD:
2670 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2671 counter[CM_DREQ_COUNTER]);
2672 goto unlock;
2673 default:
2674 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
2675 __func__, be32_to_cpu(cm_id_priv->id.local_id),
2676 cm_id_priv->id.state);
2677 goto unlock;
2678 }
2679 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2680 cm_id_priv->tid = dreq_msg->hdr.tid;
2681 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2682 if (!ret)
2683 list_add_tail(&work->list, &cm_id_priv->work_list);
2684 spin_unlock_irq(&cm_id_priv->lock);
2685
2686 if (ret)
2687 cm_process_work(cm_id_priv, work);
2688 else
2689 cm_deref_id(cm_id_priv);
2690 return 0;
2691
2692 unlock: spin_unlock_irq(&cm_id_priv->lock);
2693 deref: cm_deref_id(cm_id_priv);
2694 return -EINVAL;
2695 }
2696
cm_drep_handler(struct cm_work * work)2697 static int cm_drep_handler(struct cm_work *work)
2698 {
2699 struct cm_id_private *cm_id_priv;
2700 struct cm_drep_msg *drep_msg;
2701 int ret;
2702
2703 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2704 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2705 drep_msg->local_comm_id);
2706 if (!cm_id_priv)
2707 return -EINVAL;
2708
2709 work->cm_event.private_data = &drep_msg->private_data;
2710
2711 spin_lock_irq(&cm_id_priv->lock);
2712 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2713 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2714 spin_unlock_irq(&cm_id_priv->lock);
2715 goto out;
2716 }
2717 cm_enter_timewait(cm_id_priv);
2718
2719 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2720 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2721 if (!ret)
2722 list_add_tail(&work->list, &cm_id_priv->work_list);
2723 spin_unlock_irq(&cm_id_priv->lock);
2724
2725 if (ret)
2726 cm_process_work(cm_id_priv, work);
2727 else
2728 cm_deref_id(cm_id_priv);
2729 return 0;
2730 out:
2731 cm_deref_id(cm_id_priv);
2732 return -EINVAL;
2733 }
2734
ib_send_cm_rej(struct ib_cm_id * cm_id,enum ib_cm_rej_reason reason,void * ari,u8 ari_length,const void * private_data,u8 private_data_len)2735 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2736 enum ib_cm_rej_reason reason,
2737 void *ari,
2738 u8 ari_length,
2739 const void *private_data,
2740 u8 private_data_len)
2741 {
2742 struct cm_id_private *cm_id_priv;
2743 struct ib_mad_send_buf *msg;
2744 unsigned long flags;
2745 int ret;
2746
2747 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2748 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2749 return -EINVAL;
2750
2751 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2752
2753 spin_lock_irqsave(&cm_id_priv->lock, flags);
2754 switch (cm_id->state) {
2755 case IB_CM_REQ_SENT:
2756 case IB_CM_MRA_REQ_RCVD:
2757 case IB_CM_REQ_RCVD:
2758 case IB_CM_MRA_REQ_SENT:
2759 case IB_CM_REP_RCVD:
2760 case IB_CM_MRA_REP_SENT:
2761 ret = cm_alloc_msg(cm_id_priv, &msg);
2762 if (!ret)
2763 cm_format_rej((struct cm_rej_msg *) msg->mad,
2764 cm_id_priv, reason, ari, ari_length,
2765 private_data, private_data_len);
2766
2767 cm_reset_to_idle(cm_id_priv);
2768 break;
2769 case IB_CM_REP_SENT:
2770 case IB_CM_MRA_REP_RCVD:
2771 ret = cm_alloc_msg(cm_id_priv, &msg);
2772 if (!ret)
2773 cm_format_rej((struct cm_rej_msg *) msg->mad,
2774 cm_id_priv, reason, ari, ari_length,
2775 private_data, private_data_len);
2776
2777 cm_enter_timewait(cm_id_priv);
2778 break;
2779 default:
2780 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__,
2781 be32_to_cpu(cm_id_priv->id.local_id), cm_id->state);
2782 ret = -EINVAL;
2783 goto out;
2784 }
2785
2786 if (ret)
2787 goto out;
2788
2789 ret = ib_post_send_mad(msg, NULL);
2790 if (ret)
2791 cm_free_msg(msg);
2792
2793 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2794 return ret;
2795 }
2796 EXPORT_SYMBOL(ib_send_cm_rej);
2797
cm_format_rej_event(struct cm_work * work)2798 static void cm_format_rej_event(struct cm_work *work)
2799 {
2800 struct cm_rej_msg *rej_msg;
2801 struct ib_cm_rej_event_param *param;
2802
2803 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2804 param = &work->cm_event.param.rej_rcvd;
2805 param->ari = rej_msg->ari;
2806 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2807 param->reason = __be16_to_cpu(rej_msg->reason);
2808 work->cm_event.private_data = &rej_msg->private_data;
2809 }
2810
cm_acquire_rejected_id(struct cm_rej_msg * rej_msg)2811 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2812 {
2813 struct cm_timewait_info *timewait_info;
2814 struct cm_id_private *cm_id_priv;
2815 __be32 remote_id;
2816
2817 remote_id = rej_msg->local_comm_id;
2818
2819 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2820 spin_lock_irq(&cm.lock);
2821 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2822 remote_id);
2823 if (!timewait_info) {
2824 spin_unlock_irq(&cm.lock);
2825 return NULL;
2826 }
2827 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2828 (timewait_info->work.local_id ^
2829 cm.random_id_operand));
2830 if (cm_id_priv) {
2831 if (cm_id_priv->id.remote_id == remote_id)
2832 atomic_inc(&cm_id_priv->refcount);
2833 else
2834 cm_id_priv = NULL;
2835 }
2836 spin_unlock_irq(&cm.lock);
2837 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2838 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2839 else
2840 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2841
2842 return cm_id_priv;
2843 }
2844
cm_rej_handler(struct cm_work * work)2845 static int cm_rej_handler(struct cm_work *work)
2846 {
2847 struct cm_id_private *cm_id_priv;
2848 struct cm_rej_msg *rej_msg;
2849 int ret;
2850
2851 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2852 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2853 if (!cm_id_priv)
2854 return -EINVAL;
2855
2856 cm_format_rej_event(work);
2857
2858 spin_lock_irq(&cm_id_priv->lock);
2859 switch (cm_id_priv->id.state) {
2860 case IB_CM_REQ_SENT:
2861 case IB_CM_MRA_REQ_RCVD:
2862 case IB_CM_REP_SENT:
2863 case IB_CM_MRA_REP_RCVD:
2864 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2865 /* fall through */
2866 case IB_CM_REQ_RCVD:
2867 case IB_CM_MRA_REQ_SENT:
2868 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2869 cm_enter_timewait(cm_id_priv);
2870 else
2871 cm_reset_to_idle(cm_id_priv);
2872 break;
2873 case IB_CM_DREQ_SENT:
2874 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2875 /* fall through */
2876 case IB_CM_REP_RCVD:
2877 case IB_CM_MRA_REP_SENT:
2878 cm_enter_timewait(cm_id_priv);
2879 break;
2880 case IB_CM_ESTABLISHED:
2881 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
2882 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
2883 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
2884 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2885 cm_id_priv->msg);
2886 cm_enter_timewait(cm_id_priv);
2887 break;
2888 }
2889 /* fall through */
2890 default:
2891 spin_unlock_irq(&cm_id_priv->lock);
2892 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
2893 __func__, be32_to_cpu(cm_id_priv->id.local_id),
2894 cm_id_priv->id.state);
2895 ret = -EINVAL;
2896 goto out;
2897 }
2898
2899 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2900 if (!ret)
2901 list_add_tail(&work->list, &cm_id_priv->work_list);
2902 spin_unlock_irq(&cm_id_priv->lock);
2903
2904 if (ret)
2905 cm_process_work(cm_id_priv, work);
2906 else
2907 cm_deref_id(cm_id_priv);
2908 return 0;
2909 out:
2910 cm_deref_id(cm_id_priv);
2911 return -EINVAL;
2912 }
2913
ib_send_cm_mra(struct ib_cm_id * cm_id,u8 service_timeout,const void * private_data,u8 private_data_len)2914 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2915 u8 service_timeout,
2916 const void *private_data,
2917 u8 private_data_len)
2918 {
2919 struct cm_id_private *cm_id_priv;
2920 struct ib_mad_send_buf *msg;
2921 enum ib_cm_state cm_state;
2922 enum ib_cm_lap_state lap_state;
2923 enum cm_msg_response msg_response;
2924 void *data;
2925 unsigned long flags;
2926 int ret;
2927
2928 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2929 return -EINVAL;
2930
2931 data = cm_copy_private_data(private_data, private_data_len);
2932 if (IS_ERR(data))
2933 return PTR_ERR(data);
2934
2935 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2936
2937 spin_lock_irqsave(&cm_id_priv->lock, flags);
2938 switch(cm_id_priv->id.state) {
2939 case IB_CM_REQ_RCVD:
2940 cm_state = IB_CM_MRA_REQ_SENT;
2941 lap_state = cm_id->lap_state;
2942 msg_response = CM_MSG_RESPONSE_REQ;
2943 break;
2944 case IB_CM_REP_RCVD:
2945 cm_state = IB_CM_MRA_REP_SENT;
2946 lap_state = cm_id->lap_state;
2947 msg_response = CM_MSG_RESPONSE_REP;
2948 break;
2949 case IB_CM_ESTABLISHED:
2950 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
2951 cm_state = cm_id->state;
2952 lap_state = IB_CM_MRA_LAP_SENT;
2953 msg_response = CM_MSG_RESPONSE_OTHER;
2954 break;
2955 }
2956 /* fall through */
2957 default:
2958 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
2959 __func__, be32_to_cpu(cm_id_priv->id.local_id),
2960 cm_id_priv->id.state);
2961 ret = -EINVAL;
2962 goto error1;
2963 }
2964
2965 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
2966 ret = cm_alloc_msg(cm_id_priv, &msg);
2967 if (ret)
2968 goto error1;
2969
2970 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2971 msg_response, service_timeout,
2972 private_data, private_data_len);
2973 ret = ib_post_send_mad(msg, NULL);
2974 if (ret)
2975 goto error2;
2976 }
2977
2978 cm_id->state = cm_state;
2979 cm_id->lap_state = lap_state;
2980 cm_id_priv->service_timeout = service_timeout;
2981 cm_set_private_data(cm_id_priv, data, private_data_len);
2982 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2983 return 0;
2984
2985 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2986 kfree(data);
2987 return ret;
2988
2989 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2990 kfree(data);
2991 cm_free_msg(msg);
2992 return ret;
2993 }
2994 EXPORT_SYMBOL(ib_send_cm_mra);
2995
cm_acquire_mraed_id(struct cm_mra_msg * mra_msg)2996 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2997 {
2998 switch (cm_mra_get_msg_mraed(mra_msg)) {
2999 case CM_MSG_RESPONSE_REQ:
3000 return cm_acquire_id(mra_msg->remote_comm_id, 0);
3001 case CM_MSG_RESPONSE_REP:
3002 case CM_MSG_RESPONSE_OTHER:
3003 return cm_acquire_id(mra_msg->remote_comm_id,
3004 mra_msg->local_comm_id);
3005 default:
3006 return NULL;
3007 }
3008 }
3009
cm_mra_handler(struct cm_work * work)3010 static int cm_mra_handler(struct cm_work *work)
3011 {
3012 struct cm_id_private *cm_id_priv;
3013 struct cm_mra_msg *mra_msg;
3014 int timeout, ret;
3015
3016 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
3017 cm_id_priv = cm_acquire_mraed_id(mra_msg);
3018 if (!cm_id_priv)
3019 return -EINVAL;
3020
3021 work->cm_event.private_data = &mra_msg->private_data;
3022 work->cm_event.param.mra_rcvd.service_timeout =
3023 cm_mra_get_service_timeout(mra_msg);
3024 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
3025 cm_convert_to_ms(cm_id_priv->av.timeout);
3026
3027 spin_lock_irq(&cm_id_priv->lock);
3028 switch (cm_id_priv->id.state) {
3029 case IB_CM_REQ_SENT:
3030 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
3031 ib_modify_mad(cm_id_priv->av.port->mad_agent,
3032 cm_id_priv->msg, timeout))
3033 goto out;
3034 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
3035 break;
3036 case IB_CM_REP_SENT:
3037 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
3038 ib_modify_mad(cm_id_priv->av.port->mad_agent,
3039 cm_id_priv->msg, timeout))
3040 goto out;
3041 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
3042 break;
3043 case IB_CM_ESTABLISHED:
3044 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
3045 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
3046 ib_modify_mad(cm_id_priv->av.port->mad_agent,
3047 cm_id_priv->msg, timeout)) {
3048 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
3049 atomic_long_inc(&work->port->
3050 counter_group[CM_RECV_DUPLICATES].
3051 counter[CM_MRA_COUNTER]);
3052 goto out;
3053 }
3054 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
3055 break;
3056 case IB_CM_MRA_REQ_RCVD:
3057 case IB_CM_MRA_REP_RCVD:
3058 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3059 counter[CM_MRA_COUNTER]);
3060 /* fall through */
3061 default:
3062 pr_debug("%s local_id %d, cm_id_priv->id.state: %d\n",
3063 __func__, be32_to_cpu(cm_id_priv->id.local_id),
3064 cm_id_priv->id.state);
3065 goto out;
3066 }
3067
3068 cm_id_priv->msg->context[1] = (void *) (unsigned long)
3069 cm_id_priv->id.state;
3070 ret = atomic_inc_and_test(&cm_id_priv->work_count);
3071 if (!ret)
3072 list_add_tail(&work->list, &cm_id_priv->work_list);
3073 spin_unlock_irq(&cm_id_priv->lock);
3074
3075 if (ret)
3076 cm_process_work(cm_id_priv, work);
3077 else
3078 cm_deref_id(cm_id_priv);
3079 return 0;
3080 out:
3081 spin_unlock_irq(&cm_id_priv->lock);
3082 cm_deref_id(cm_id_priv);
3083 return -EINVAL;
3084 }
3085
cm_format_lap(struct cm_lap_msg * lap_msg,struct cm_id_private * cm_id_priv,struct sa_path_rec * alternate_path,const void * private_data,u8 private_data_len)3086 static void cm_format_lap(struct cm_lap_msg *lap_msg,
3087 struct cm_id_private *cm_id_priv,
3088 struct sa_path_rec *alternate_path,
3089 const void *private_data,
3090 u8 private_data_len)
3091 {
3092 bool alt_ext = false;
3093
3094 if (alternate_path->rec_type == SA_PATH_REC_TYPE_OPA)
3095 alt_ext = opa_is_extended_lid(alternate_path->opa.dlid,
3096 alternate_path->opa.slid);
3097 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
3098 cm_form_tid(cm_id_priv));
3099 lap_msg->local_comm_id = cm_id_priv->id.local_id;
3100 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
3101 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
3102 /* todo: need remote CM response timeout */
3103 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
3104 lap_msg->alt_local_lid =
3105 htons(ntohl(sa_path_get_slid(alternate_path)));
3106 lap_msg->alt_remote_lid =
3107 htons(ntohl(sa_path_get_dlid(alternate_path)));
3108 lap_msg->alt_local_gid = alternate_path->sgid;
3109 lap_msg->alt_remote_gid = alternate_path->dgid;
3110 if (alt_ext) {
3111 lap_msg->alt_local_gid.global.interface_id
3112 = OPA_MAKE_ID(be32_to_cpu(alternate_path->opa.slid));
3113 lap_msg->alt_remote_gid.global.interface_id
3114 = OPA_MAKE_ID(be32_to_cpu(alternate_path->opa.dlid));
3115 }
3116 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
3117 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
3118 lap_msg->alt_hop_limit = alternate_path->hop_limit;
3119 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
3120 cm_lap_set_sl(lap_msg, alternate_path->sl);
3121 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
3122 cm_lap_set_local_ack_timeout(lap_msg,
3123 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
3124 alternate_path->packet_life_time));
3125
3126 if (private_data && private_data_len)
3127 memcpy(lap_msg->private_data, private_data, private_data_len);
3128 }
3129
ib_send_cm_lap(struct ib_cm_id * cm_id,struct sa_path_rec * alternate_path,const void * private_data,u8 private_data_len)3130 int ib_send_cm_lap(struct ib_cm_id *cm_id,
3131 struct sa_path_rec *alternate_path,
3132 const void *private_data,
3133 u8 private_data_len)
3134 {
3135 struct cm_id_private *cm_id_priv;
3136 struct ib_mad_send_buf *msg;
3137 unsigned long flags;
3138 int ret;
3139
3140 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
3141 return -EINVAL;
3142
3143 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3144 spin_lock_irqsave(&cm_id_priv->lock, flags);
3145 if (cm_id->state != IB_CM_ESTABLISHED ||
3146 (cm_id->lap_state != IB_CM_LAP_UNINIT &&
3147 cm_id->lap_state != IB_CM_LAP_IDLE)) {
3148 ret = -EINVAL;
3149 goto out;
3150 }
3151
3152 ret = cm_init_av_by_path(alternate_path, NULL, &cm_id_priv->alt_av,
3153 cm_id_priv);
3154 if (ret)
3155 goto out;
3156 cm_id_priv->alt_av.timeout =
3157 cm_ack_timeout(cm_id_priv->target_ack_delay,
3158 cm_id_priv->alt_av.timeout - 1);
3159
3160 ret = cm_alloc_msg(cm_id_priv, &msg);
3161 if (ret)
3162 goto out;
3163
3164 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
3165 alternate_path, private_data, private_data_len);
3166 msg->timeout_ms = cm_id_priv->timeout_ms;
3167 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
3168
3169 ret = ib_post_send_mad(msg, NULL);
3170 if (ret) {
3171 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3172 cm_free_msg(msg);
3173 return ret;
3174 }
3175
3176 cm_id->lap_state = IB_CM_LAP_SENT;
3177 cm_id_priv->msg = msg;
3178
3179 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3180 return ret;
3181 }
3182 EXPORT_SYMBOL(ib_send_cm_lap);
3183
cm_format_path_lid_from_lap(struct cm_lap_msg * lap_msg,struct sa_path_rec * path)3184 static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg,
3185 struct sa_path_rec *path)
3186 {
3187 u32 lid;
3188
3189 if (path->rec_type != SA_PATH_REC_TYPE_OPA) {
3190 sa_path_set_dlid(path, ntohs(lap_msg->alt_local_lid));
3191 sa_path_set_slid(path, ntohs(lap_msg->alt_remote_lid));
3192 } else {
3193 lid = opa_get_lid_from_gid(&lap_msg->alt_local_gid);
3194 sa_path_set_dlid(path, lid);
3195
3196 lid = opa_get_lid_from_gid(&lap_msg->alt_remote_gid);
3197 sa_path_set_slid(path, lid);
3198 }
3199 }
3200
cm_format_path_from_lap(struct cm_id_private * cm_id_priv,struct sa_path_rec * path,struct cm_lap_msg * lap_msg)3201 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
3202 struct sa_path_rec *path,
3203 struct cm_lap_msg *lap_msg)
3204 {
3205 path->dgid = lap_msg->alt_local_gid;
3206 path->sgid = lap_msg->alt_remote_gid;
3207 path->flow_label = cm_lap_get_flow_label(lap_msg);
3208 path->hop_limit = lap_msg->alt_hop_limit;
3209 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
3210 path->reversible = 1;
3211 path->pkey = cm_id_priv->pkey;
3212 path->sl = cm_lap_get_sl(lap_msg);
3213 path->mtu_selector = IB_SA_EQ;
3214 path->mtu = cm_id_priv->path_mtu;
3215 path->rate_selector = IB_SA_EQ;
3216 path->rate = cm_lap_get_packet_rate(lap_msg);
3217 path->packet_life_time_selector = IB_SA_EQ;
3218 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
3219 path->packet_life_time -= (path->packet_life_time > 0);
3220 cm_format_path_lid_from_lap(lap_msg, path);
3221 }
3222
cm_lap_handler(struct cm_work * work)3223 static int cm_lap_handler(struct cm_work *work)
3224 {
3225 struct cm_id_private *cm_id_priv;
3226 struct cm_lap_msg *lap_msg;
3227 struct ib_cm_lap_event_param *param;
3228 struct ib_mad_send_buf *msg = NULL;
3229 int ret;
3230
3231 /* Currently Alternate path messages are not supported for
3232 * RoCE link layer.
3233 */
3234 if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3235 work->port->port_num))
3236 return -EINVAL;
3237
3238 /* todo: verify LAP request and send reject APR if invalid. */
3239 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
3240 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
3241 lap_msg->local_comm_id);
3242 if (!cm_id_priv)
3243 return -EINVAL;
3244
3245 param = &work->cm_event.param.lap_rcvd;
3246 memset(&work->path[0], 0, sizeof(work->path[1]));
3247 cm_path_set_rec_type(work->port->cm_dev->ib_device,
3248 work->port->port_num,
3249 &work->path[0],
3250 &lap_msg->alt_local_gid);
3251 param->alternate_path = &work->path[0];
3252 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
3253 work->cm_event.private_data = &lap_msg->private_data;
3254
3255 spin_lock_irq(&cm_id_priv->lock);
3256 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
3257 goto unlock;
3258
3259 switch (cm_id_priv->id.lap_state) {
3260 case IB_CM_LAP_UNINIT:
3261 case IB_CM_LAP_IDLE:
3262 break;
3263 case IB_CM_MRA_LAP_SENT:
3264 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3265 counter[CM_LAP_COUNTER]);
3266 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
3267 if (IS_ERR(msg))
3268 goto unlock;
3269
3270 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
3271 CM_MSG_RESPONSE_OTHER,
3272 cm_id_priv->service_timeout,
3273 cm_id_priv->private_data,
3274 cm_id_priv->private_data_len);
3275 spin_unlock_irq(&cm_id_priv->lock);
3276
3277 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
3278 ib_post_send_mad(msg, NULL))
3279 cm_free_msg(msg);
3280 goto deref;
3281 case IB_CM_LAP_RCVD:
3282 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3283 counter[CM_LAP_COUNTER]);
3284 goto unlock;
3285 default:
3286 goto unlock;
3287 }
3288
3289 ret = cm_init_av_for_lap(work->port, work->mad_recv_wc->wc,
3290 work->mad_recv_wc->recv_buf.grh,
3291 &cm_id_priv->av);
3292 if (ret)
3293 goto unlock;
3294
3295 cm_init_av_by_path(param->alternate_path, NULL, &cm_id_priv->alt_av,
3296 cm_id_priv);
3297 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
3298 cm_id_priv->tid = lap_msg->hdr.tid;
3299 ret = atomic_inc_and_test(&cm_id_priv->work_count);
3300 if (!ret)
3301 list_add_tail(&work->list, &cm_id_priv->work_list);
3302 spin_unlock_irq(&cm_id_priv->lock);
3303
3304 if (ret)
3305 cm_process_work(cm_id_priv, work);
3306 else
3307 cm_deref_id(cm_id_priv);
3308 return 0;
3309
3310 unlock: spin_unlock_irq(&cm_id_priv->lock);
3311 deref: cm_deref_id(cm_id_priv);
3312 return -EINVAL;
3313 }
3314
cm_format_apr(struct cm_apr_msg * apr_msg,struct cm_id_private * cm_id_priv,enum ib_cm_apr_status status,void * info,u8 info_length,const void * private_data,u8 private_data_len)3315 static void cm_format_apr(struct cm_apr_msg *apr_msg,
3316 struct cm_id_private *cm_id_priv,
3317 enum ib_cm_apr_status status,
3318 void *info,
3319 u8 info_length,
3320 const void *private_data,
3321 u8 private_data_len)
3322 {
3323 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
3324 apr_msg->local_comm_id = cm_id_priv->id.local_id;
3325 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
3326 apr_msg->ap_status = (u8) status;
3327
3328 if (info && info_length) {
3329 apr_msg->info_length = info_length;
3330 memcpy(apr_msg->info, info, info_length);
3331 }
3332
3333 if (private_data && private_data_len)
3334 memcpy(apr_msg->private_data, private_data, private_data_len);
3335 }
3336
ib_send_cm_apr(struct ib_cm_id * cm_id,enum ib_cm_apr_status status,void * info,u8 info_length,const void * private_data,u8 private_data_len)3337 int ib_send_cm_apr(struct ib_cm_id *cm_id,
3338 enum ib_cm_apr_status status,
3339 void *info,
3340 u8 info_length,
3341 const void *private_data,
3342 u8 private_data_len)
3343 {
3344 struct cm_id_private *cm_id_priv;
3345 struct ib_mad_send_buf *msg;
3346 unsigned long flags;
3347 int ret;
3348
3349 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
3350 (info && info_length > IB_CM_APR_INFO_LENGTH))
3351 return -EINVAL;
3352
3353 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3354 spin_lock_irqsave(&cm_id_priv->lock, flags);
3355 if (cm_id->state != IB_CM_ESTABLISHED ||
3356 (cm_id->lap_state != IB_CM_LAP_RCVD &&
3357 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
3358 ret = -EINVAL;
3359 goto out;
3360 }
3361
3362 ret = cm_alloc_msg(cm_id_priv, &msg);
3363 if (ret)
3364 goto out;
3365
3366 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
3367 info, info_length, private_data, private_data_len);
3368 ret = ib_post_send_mad(msg, NULL);
3369 if (ret) {
3370 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3371 cm_free_msg(msg);
3372 return ret;
3373 }
3374
3375 cm_id->lap_state = IB_CM_LAP_IDLE;
3376 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3377 return ret;
3378 }
3379 EXPORT_SYMBOL(ib_send_cm_apr);
3380
cm_apr_handler(struct cm_work * work)3381 static int cm_apr_handler(struct cm_work *work)
3382 {
3383 struct cm_id_private *cm_id_priv;
3384 struct cm_apr_msg *apr_msg;
3385 int ret;
3386
3387 /* Currently Alternate path messages are not supported for
3388 * RoCE link layer.
3389 */
3390 if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3391 work->port->port_num))
3392 return -EINVAL;
3393
3394 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
3395 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
3396 apr_msg->local_comm_id);
3397 if (!cm_id_priv)
3398 return -EINVAL; /* Unmatched reply. */
3399
3400 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
3401 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
3402 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
3403 work->cm_event.private_data = &apr_msg->private_data;
3404
3405 spin_lock_irq(&cm_id_priv->lock);
3406 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
3407 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
3408 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
3409 spin_unlock_irq(&cm_id_priv->lock);
3410 goto out;
3411 }
3412 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
3413 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3414 cm_id_priv->msg = NULL;
3415
3416 ret = atomic_inc_and_test(&cm_id_priv->work_count);
3417 if (!ret)
3418 list_add_tail(&work->list, &cm_id_priv->work_list);
3419 spin_unlock_irq(&cm_id_priv->lock);
3420
3421 if (ret)
3422 cm_process_work(cm_id_priv, work);
3423 else
3424 cm_deref_id(cm_id_priv);
3425 return 0;
3426 out:
3427 cm_deref_id(cm_id_priv);
3428 return -EINVAL;
3429 }
3430
cm_timewait_handler(struct cm_work * work)3431 static int cm_timewait_handler(struct cm_work *work)
3432 {
3433 struct cm_timewait_info *timewait_info;
3434 struct cm_id_private *cm_id_priv;
3435 int ret;
3436
3437 timewait_info = (struct cm_timewait_info *)work;
3438 spin_lock_irq(&cm.lock);
3439 list_del(&timewait_info->list);
3440 spin_unlock_irq(&cm.lock);
3441
3442 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
3443 timewait_info->work.remote_id);
3444 if (!cm_id_priv)
3445 return -EINVAL;
3446
3447 spin_lock_irq(&cm_id_priv->lock);
3448 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
3449 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
3450 spin_unlock_irq(&cm_id_priv->lock);
3451 goto out;
3452 }
3453 cm_id_priv->id.state = IB_CM_IDLE;
3454 ret = atomic_inc_and_test(&cm_id_priv->work_count);
3455 if (!ret)
3456 list_add_tail(&work->list, &cm_id_priv->work_list);
3457 spin_unlock_irq(&cm_id_priv->lock);
3458
3459 if (ret)
3460 cm_process_work(cm_id_priv, work);
3461 else
3462 cm_deref_id(cm_id_priv);
3463 return 0;
3464 out:
3465 cm_deref_id(cm_id_priv);
3466 return -EINVAL;
3467 }
3468
cm_format_sidr_req(struct cm_sidr_req_msg * sidr_req_msg,struct cm_id_private * cm_id_priv,struct ib_cm_sidr_req_param * param)3469 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
3470 struct cm_id_private *cm_id_priv,
3471 struct ib_cm_sidr_req_param *param)
3472 {
3473 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
3474 cm_form_tid(cm_id_priv));
3475 sidr_req_msg->request_id = cm_id_priv->id.local_id;
3476 sidr_req_msg->pkey = param->path->pkey;
3477 sidr_req_msg->service_id = param->service_id;
3478
3479 if (param->private_data && param->private_data_len)
3480 memcpy(sidr_req_msg->private_data, param->private_data,
3481 param->private_data_len);
3482 }
3483
ib_send_cm_sidr_req(struct ib_cm_id * cm_id,struct ib_cm_sidr_req_param * param)3484 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
3485 struct ib_cm_sidr_req_param *param)
3486 {
3487 struct cm_id_private *cm_id_priv;
3488 struct ib_mad_send_buf *msg;
3489 unsigned long flags;
3490 int ret;
3491
3492 if (!param->path || (param->private_data &&
3493 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
3494 return -EINVAL;
3495
3496 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3497 ret = cm_init_av_by_path(param->path, param->sgid_attr,
3498 &cm_id_priv->av,
3499 cm_id_priv);
3500 if (ret)
3501 goto out;
3502
3503 cm_id->service_id = param->service_id;
3504 cm_id->service_mask = ~cpu_to_be64(0);
3505 cm_id_priv->timeout_ms = param->timeout_ms;
3506 cm_id_priv->max_cm_retries = param->max_cm_retries;
3507 ret = cm_alloc_msg(cm_id_priv, &msg);
3508 if (ret)
3509 goto out;
3510
3511 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
3512 param);
3513 msg->timeout_ms = cm_id_priv->timeout_ms;
3514 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
3515
3516 spin_lock_irqsave(&cm_id_priv->lock, flags);
3517 if (cm_id->state == IB_CM_IDLE)
3518 ret = ib_post_send_mad(msg, NULL);
3519 else
3520 ret = -EINVAL;
3521
3522 if (ret) {
3523 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3524 cm_free_msg(msg);
3525 goto out;
3526 }
3527 cm_id->state = IB_CM_SIDR_REQ_SENT;
3528 cm_id_priv->msg = msg;
3529 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3530 out:
3531 return ret;
3532 }
3533 EXPORT_SYMBOL(ib_send_cm_sidr_req);
3534
cm_format_sidr_req_event(struct cm_work * work,const struct cm_id_private * rx_cm_id,struct ib_cm_id * listen_id)3535 static void cm_format_sidr_req_event(struct cm_work *work,
3536 const struct cm_id_private *rx_cm_id,
3537 struct ib_cm_id *listen_id)
3538 {
3539 struct cm_sidr_req_msg *sidr_req_msg;
3540 struct ib_cm_sidr_req_event_param *param;
3541
3542 sidr_req_msg = (struct cm_sidr_req_msg *)
3543 work->mad_recv_wc->recv_buf.mad;
3544 param = &work->cm_event.param.sidr_req_rcvd;
3545 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
3546 param->listen_id = listen_id;
3547 param->service_id = sidr_req_msg->service_id;
3548 param->bth_pkey = cm_get_bth_pkey(work);
3549 param->port = work->port->port_num;
3550 param->sgid_attr = rx_cm_id->av.ah_attr.grh.sgid_attr;
3551 work->cm_event.private_data = &sidr_req_msg->private_data;
3552 }
3553
cm_sidr_req_handler(struct cm_work * work)3554 static int cm_sidr_req_handler(struct cm_work *work)
3555 {
3556 struct ib_cm_id *cm_id;
3557 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
3558 struct cm_sidr_req_msg *sidr_req_msg;
3559 struct ib_wc *wc;
3560 int ret;
3561
3562 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
3563 if (IS_ERR(cm_id))
3564 return PTR_ERR(cm_id);
3565 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3566
3567 /* Record SGID/SLID and request ID for lookup. */
3568 sidr_req_msg = (struct cm_sidr_req_msg *)
3569 work->mad_recv_wc->recv_buf.mad;
3570 wc = work->mad_recv_wc->wc;
3571 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
3572 cm_id_priv->av.dgid.global.interface_id = 0;
3573 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
3574 work->mad_recv_wc->recv_buf.grh,
3575 &cm_id_priv->av);
3576 if (ret)
3577 goto out;
3578
3579 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
3580 cm_id_priv->tid = sidr_req_msg->hdr.tid;
3581 atomic_inc(&cm_id_priv->work_count);
3582
3583 spin_lock_irq(&cm.lock);
3584 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3585 if (cur_cm_id_priv) {
3586 spin_unlock_irq(&cm.lock);
3587 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3588 counter[CM_SIDR_REQ_COUNTER]);
3589 goto out; /* Duplicate message. */
3590 }
3591 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3592 cur_cm_id_priv = cm_find_listen(cm_id->device,
3593 sidr_req_msg->service_id);
3594 if (!cur_cm_id_priv) {
3595 spin_unlock_irq(&cm.lock);
3596 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED);
3597 goto out; /* No match. */
3598 }
3599 atomic_inc(&cur_cm_id_priv->refcount);
3600 atomic_inc(&cm_id_priv->refcount);
3601 spin_unlock_irq(&cm.lock);
3602
3603 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
3604 cm_id_priv->id.context = cur_cm_id_priv->id.context;
3605 cm_id_priv->id.service_id = sidr_req_msg->service_id;
3606 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3607
3608 cm_format_sidr_req_event(work, cm_id_priv, &cur_cm_id_priv->id);
3609 cm_process_work(cm_id_priv, work);
3610 cm_deref_id(cur_cm_id_priv);
3611 return 0;
3612 out:
3613 ib_destroy_cm_id(&cm_id_priv->id);
3614 return -EINVAL;
3615 }
3616
cm_format_sidr_rep(struct cm_sidr_rep_msg * sidr_rep_msg,struct cm_id_private * cm_id_priv,struct ib_cm_sidr_rep_param * param)3617 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3618 struct cm_id_private *cm_id_priv,
3619 struct ib_cm_sidr_rep_param *param)
3620 {
3621 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3622 cm_id_priv->tid);
3623 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
3624 sidr_rep_msg->status = param->status;
3625 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
3626 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
3627 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
3628
3629 if (param->info && param->info_length)
3630 memcpy(sidr_rep_msg->info, param->info, param->info_length);
3631
3632 if (param->private_data && param->private_data_len)
3633 memcpy(sidr_rep_msg->private_data, param->private_data,
3634 param->private_data_len);
3635 }
3636
ib_send_cm_sidr_rep(struct ib_cm_id * cm_id,struct ib_cm_sidr_rep_param * param)3637 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3638 struct ib_cm_sidr_rep_param *param)
3639 {
3640 struct cm_id_private *cm_id_priv;
3641 struct ib_mad_send_buf *msg;
3642 unsigned long flags;
3643 int ret;
3644
3645 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3646 (param->private_data &&
3647 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3648 return -EINVAL;
3649
3650 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3651 spin_lock_irqsave(&cm_id_priv->lock, flags);
3652 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
3653 ret = -EINVAL;
3654 goto error;
3655 }
3656
3657 ret = cm_alloc_msg(cm_id_priv, &msg);
3658 if (ret)
3659 goto error;
3660
3661 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3662 param);
3663 ret = ib_post_send_mad(msg, NULL);
3664 if (ret) {
3665 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3666 cm_free_msg(msg);
3667 return ret;
3668 }
3669 cm_id->state = IB_CM_IDLE;
3670 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3671
3672 spin_lock_irqsave(&cm.lock, flags);
3673 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) {
3674 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3675 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
3676 }
3677 spin_unlock_irqrestore(&cm.lock, flags);
3678 return 0;
3679
3680 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3681 return ret;
3682 }
3683 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3684
cm_format_sidr_rep_event(struct cm_work * work,const struct cm_id_private * cm_id_priv)3685 static void cm_format_sidr_rep_event(struct cm_work *work,
3686 const struct cm_id_private *cm_id_priv)
3687 {
3688 struct cm_sidr_rep_msg *sidr_rep_msg;
3689 struct ib_cm_sidr_rep_event_param *param;
3690
3691 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3692 work->mad_recv_wc->recv_buf.mad;
3693 param = &work->cm_event.param.sidr_rep_rcvd;
3694 param->status = sidr_rep_msg->status;
3695 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
3696 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
3697 param->info = &sidr_rep_msg->info;
3698 param->info_len = sidr_rep_msg->info_length;
3699 param->sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
3700 work->cm_event.private_data = &sidr_rep_msg->private_data;
3701 }
3702
cm_sidr_rep_handler(struct cm_work * work)3703 static int cm_sidr_rep_handler(struct cm_work *work)
3704 {
3705 struct cm_sidr_rep_msg *sidr_rep_msg;
3706 struct cm_id_private *cm_id_priv;
3707
3708 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3709 work->mad_recv_wc->recv_buf.mad;
3710 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
3711 if (!cm_id_priv)
3712 return -EINVAL; /* Unmatched reply. */
3713
3714 spin_lock_irq(&cm_id_priv->lock);
3715 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3716 spin_unlock_irq(&cm_id_priv->lock);
3717 goto out;
3718 }
3719 cm_id_priv->id.state = IB_CM_IDLE;
3720 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3721 spin_unlock_irq(&cm_id_priv->lock);
3722
3723 cm_format_sidr_rep_event(work, cm_id_priv);
3724 cm_process_work(cm_id_priv, work);
3725 return 0;
3726 out:
3727 cm_deref_id(cm_id_priv);
3728 return -EINVAL;
3729 }
3730
cm_process_send_error(struct ib_mad_send_buf * msg,enum ib_wc_status wc_status)3731 static void cm_process_send_error(struct ib_mad_send_buf *msg,
3732 enum ib_wc_status wc_status)
3733 {
3734 struct cm_id_private *cm_id_priv;
3735 struct ib_cm_event cm_event;
3736 enum ib_cm_state state;
3737 int ret;
3738
3739 memset(&cm_event, 0, sizeof cm_event);
3740 cm_id_priv = msg->context[0];
3741
3742 /* Discard old sends or ones without a response. */
3743 spin_lock_irq(&cm_id_priv->lock);
3744 state = (enum ib_cm_state) (unsigned long) msg->context[1];
3745 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3746 goto discard;
3747
3748 pr_debug_ratelimited("CM: failed sending MAD in state %d. (%s)\n",
3749 state, ib_wc_status_msg(wc_status));
3750 switch (state) {
3751 case IB_CM_REQ_SENT:
3752 case IB_CM_MRA_REQ_RCVD:
3753 cm_reset_to_idle(cm_id_priv);
3754 cm_event.event = IB_CM_REQ_ERROR;
3755 break;
3756 case IB_CM_REP_SENT:
3757 case IB_CM_MRA_REP_RCVD:
3758 cm_reset_to_idle(cm_id_priv);
3759 cm_event.event = IB_CM_REP_ERROR;
3760 break;
3761 case IB_CM_DREQ_SENT:
3762 cm_enter_timewait(cm_id_priv);
3763 cm_event.event = IB_CM_DREQ_ERROR;
3764 break;
3765 case IB_CM_SIDR_REQ_SENT:
3766 cm_id_priv->id.state = IB_CM_IDLE;
3767 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3768 break;
3769 default:
3770 goto discard;
3771 }
3772 spin_unlock_irq(&cm_id_priv->lock);
3773 cm_event.param.send_status = wc_status;
3774
3775 /* No other events can occur on the cm_id at this point. */
3776 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3777 cm_free_msg(msg);
3778 if (ret)
3779 ib_destroy_cm_id(&cm_id_priv->id);
3780 return;
3781 discard:
3782 spin_unlock_irq(&cm_id_priv->lock);
3783 cm_free_msg(msg);
3784 }
3785
cm_send_handler(struct ib_mad_agent * mad_agent,struct ib_mad_send_wc * mad_send_wc)3786 static void cm_send_handler(struct ib_mad_agent *mad_agent,
3787 struct ib_mad_send_wc *mad_send_wc)
3788 {
3789 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3790 struct cm_port *port;
3791 u16 attr_index;
3792
3793 port = mad_agent->context;
3794 attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3795 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3796
3797 /*
3798 * If the send was in response to a received message (context[0] is not
3799 * set to a cm_id), and is not a REJ, then it is a send that was
3800 * manually retried.
3801 */
3802 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3803 msg->retries = 1;
3804
3805 atomic_long_add(1 + msg->retries,
3806 &port->counter_group[CM_XMIT].counter[attr_index]);
3807 if (msg->retries)
3808 atomic_long_add(msg->retries,
3809 &port->counter_group[CM_XMIT_RETRIES].
3810 counter[attr_index]);
3811
3812 switch (mad_send_wc->status) {
3813 case IB_WC_SUCCESS:
3814 case IB_WC_WR_FLUSH_ERR:
3815 cm_free_msg(msg);
3816 break;
3817 default:
3818 if (msg->context[0] && msg->context[1])
3819 cm_process_send_error(msg, mad_send_wc->status);
3820 else
3821 cm_free_msg(msg);
3822 break;
3823 }
3824 }
3825
cm_work_handler(struct work_struct * _work)3826 static void cm_work_handler(struct work_struct *_work)
3827 {
3828 struct cm_work *work = container_of(_work, struct cm_work, work.work);
3829 int ret;
3830
3831 switch (work->cm_event.event) {
3832 case IB_CM_REQ_RECEIVED:
3833 ret = cm_req_handler(work);
3834 break;
3835 case IB_CM_MRA_RECEIVED:
3836 ret = cm_mra_handler(work);
3837 break;
3838 case IB_CM_REJ_RECEIVED:
3839 ret = cm_rej_handler(work);
3840 break;
3841 case IB_CM_REP_RECEIVED:
3842 ret = cm_rep_handler(work);
3843 break;
3844 case IB_CM_RTU_RECEIVED:
3845 ret = cm_rtu_handler(work);
3846 break;
3847 case IB_CM_USER_ESTABLISHED:
3848 ret = cm_establish_handler(work);
3849 break;
3850 case IB_CM_DREQ_RECEIVED:
3851 ret = cm_dreq_handler(work);
3852 break;
3853 case IB_CM_DREP_RECEIVED:
3854 ret = cm_drep_handler(work);
3855 break;
3856 case IB_CM_SIDR_REQ_RECEIVED:
3857 ret = cm_sidr_req_handler(work);
3858 break;
3859 case IB_CM_SIDR_REP_RECEIVED:
3860 ret = cm_sidr_rep_handler(work);
3861 break;
3862 case IB_CM_LAP_RECEIVED:
3863 ret = cm_lap_handler(work);
3864 break;
3865 case IB_CM_APR_RECEIVED:
3866 ret = cm_apr_handler(work);
3867 break;
3868 case IB_CM_TIMEWAIT_EXIT:
3869 ret = cm_timewait_handler(work);
3870 break;
3871 default:
3872 pr_debug("cm_event.event: 0x%x\n", work->cm_event.event);
3873 ret = -EINVAL;
3874 break;
3875 }
3876 if (ret)
3877 cm_free_work(work);
3878 }
3879
cm_establish(struct ib_cm_id * cm_id)3880 static int cm_establish(struct ib_cm_id *cm_id)
3881 {
3882 struct cm_id_private *cm_id_priv;
3883 struct cm_work *work;
3884 unsigned long flags;
3885 int ret = 0;
3886 struct cm_device *cm_dev;
3887
3888 cm_dev = ib_get_client_data(cm_id->device, &cm_client);
3889 if (!cm_dev)
3890 return -ENODEV;
3891
3892 work = kmalloc(sizeof *work, GFP_ATOMIC);
3893 if (!work)
3894 return -ENOMEM;
3895
3896 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3897 spin_lock_irqsave(&cm_id_priv->lock, flags);
3898 switch (cm_id->state)
3899 {
3900 case IB_CM_REP_SENT:
3901 case IB_CM_MRA_REP_RCVD:
3902 cm_id->state = IB_CM_ESTABLISHED;
3903 break;
3904 case IB_CM_ESTABLISHED:
3905 ret = -EISCONN;
3906 break;
3907 default:
3908 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__,
3909 be32_to_cpu(cm_id->local_id), cm_id->state);
3910 ret = -EINVAL;
3911 break;
3912 }
3913 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3914
3915 if (ret) {
3916 kfree(work);
3917 goto out;
3918 }
3919
3920 /*
3921 * The CM worker thread may try to destroy the cm_id before it
3922 * can execute this work item. To prevent potential deadlock,
3923 * we need to find the cm_id once we're in the context of the
3924 * worker thread, rather than holding a reference on it.
3925 */
3926 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3927 work->local_id = cm_id->local_id;
3928 work->remote_id = cm_id->remote_id;
3929 work->mad_recv_wc = NULL;
3930 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3931
3932 /* Check if the device started its remove_one */
3933 spin_lock_irqsave(&cm.lock, flags);
3934 if (!cm_dev->going_down) {
3935 queue_delayed_work(cm.wq, &work->work, 0);
3936 } else {
3937 kfree(work);
3938 ret = -ENODEV;
3939 }
3940 spin_unlock_irqrestore(&cm.lock, flags);
3941
3942 out:
3943 return ret;
3944 }
3945
cm_migrate(struct ib_cm_id * cm_id)3946 static int cm_migrate(struct ib_cm_id *cm_id)
3947 {
3948 struct cm_id_private *cm_id_priv;
3949 struct cm_av tmp_av;
3950 unsigned long flags;
3951 int tmp_send_port_not_ready;
3952 int ret = 0;
3953
3954 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3955 spin_lock_irqsave(&cm_id_priv->lock, flags);
3956 if (cm_id->state == IB_CM_ESTABLISHED &&
3957 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3958 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3959 cm_id->lap_state = IB_CM_LAP_IDLE;
3960 /* Swap address vector */
3961 tmp_av = cm_id_priv->av;
3962 cm_id_priv->av = cm_id_priv->alt_av;
3963 cm_id_priv->alt_av = tmp_av;
3964 /* Swap port send ready state */
3965 tmp_send_port_not_ready = cm_id_priv->prim_send_port_not_ready;
3966 cm_id_priv->prim_send_port_not_ready = cm_id_priv->altr_send_port_not_ready;
3967 cm_id_priv->altr_send_port_not_ready = tmp_send_port_not_ready;
3968 } else
3969 ret = -EINVAL;
3970 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3971
3972 return ret;
3973 }
3974
ib_cm_notify(struct ib_cm_id * cm_id,enum ib_event_type event)3975 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3976 {
3977 int ret;
3978
3979 switch (event) {
3980 case IB_EVENT_COMM_EST:
3981 ret = cm_establish(cm_id);
3982 break;
3983 case IB_EVENT_PATH_MIG:
3984 ret = cm_migrate(cm_id);
3985 break;
3986 default:
3987 ret = -EINVAL;
3988 }
3989 return ret;
3990 }
3991 EXPORT_SYMBOL(ib_cm_notify);
3992
cm_recv_handler(struct ib_mad_agent * mad_agent,struct ib_mad_send_buf * send_buf,struct ib_mad_recv_wc * mad_recv_wc)3993 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3994 struct ib_mad_send_buf *send_buf,
3995 struct ib_mad_recv_wc *mad_recv_wc)
3996 {
3997 struct cm_port *port = mad_agent->context;
3998 struct cm_work *work;
3999 enum ib_cm_event_type event;
4000 bool alt_path = false;
4001 u16 attr_id;
4002 int paths = 0;
4003 int going_down = 0;
4004
4005 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
4006 case CM_REQ_ATTR_ID:
4007 alt_path = cm_req_has_alt_path((struct cm_req_msg *)
4008 mad_recv_wc->recv_buf.mad);
4009 paths = 1 + (alt_path != 0);
4010 event = IB_CM_REQ_RECEIVED;
4011 break;
4012 case CM_MRA_ATTR_ID:
4013 event = IB_CM_MRA_RECEIVED;
4014 break;
4015 case CM_REJ_ATTR_ID:
4016 event = IB_CM_REJ_RECEIVED;
4017 break;
4018 case CM_REP_ATTR_ID:
4019 event = IB_CM_REP_RECEIVED;
4020 break;
4021 case CM_RTU_ATTR_ID:
4022 event = IB_CM_RTU_RECEIVED;
4023 break;
4024 case CM_DREQ_ATTR_ID:
4025 event = IB_CM_DREQ_RECEIVED;
4026 break;
4027 case CM_DREP_ATTR_ID:
4028 event = IB_CM_DREP_RECEIVED;
4029 break;
4030 case CM_SIDR_REQ_ATTR_ID:
4031 event = IB_CM_SIDR_REQ_RECEIVED;
4032 break;
4033 case CM_SIDR_REP_ATTR_ID:
4034 event = IB_CM_SIDR_REP_RECEIVED;
4035 break;
4036 case CM_LAP_ATTR_ID:
4037 paths = 1;
4038 event = IB_CM_LAP_RECEIVED;
4039 break;
4040 case CM_APR_ATTR_ID:
4041 event = IB_CM_APR_RECEIVED;
4042 break;
4043 default:
4044 ib_free_recv_mad(mad_recv_wc);
4045 return;
4046 }
4047
4048 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
4049 atomic_long_inc(&port->counter_group[CM_RECV].
4050 counter[attr_id - CM_ATTR_ID_OFFSET]);
4051
4052 work = kmalloc(sizeof(*work) + sizeof(struct sa_path_rec) * paths,
4053 GFP_KERNEL);
4054 if (!work) {
4055 ib_free_recv_mad(mad_recv_wc);
4056 return;
4057 }
4058
4059 INIT_DELAYED_WORK(&work->work, cm_work_handler);
4060 work->cm_event.event = event;
4061 work->mad_recv_wc = mad_recv_wc;
4062 work->port = port;
4063
4064 /* Check if the device started its remove_one */
4065 spin_lock_irq(&cm.lock);
4066 if (!port->cm_dev->going_down)
4067 queue_delayed_work(cm.wq, &work->work, 0);
4068 else
4069 going_down = 1;
4070 spin_unlock_irq(&cm.lock);
4071
4072 if (going_down) {
4073 kfree(work);
4074 ib_free_recv_mad(mad_recv_wc);
4075 }
4076 }
4077
cm_init_qp_init_attr(struct cm_id_private * cm_id_priv,struct ib_qp_attr * qp_attr,int * qp_attr_mask)4078 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
4079 struct ib_qp_attr *qp_attr,
4080 int *qp_attr_mask)
4081 {
4082 unsigned long flags;
4083 int ret;
4084
4085 spin_lock_irqsave(&cm_id_priv->lock, flags);
4086 switch (cm_id_priv->id.state) {
4087 case IB_CM_REQ_SENT:
4088 case IB_CM_MRA_REQ_RCVD:
4089 case IB_CM_REQ_RCVD:
4090 case IB_CM_MRA_REQ_SENT:
4091 case IB_CM_REP_RCVD:
4092 case IB_CM_MRA_REP_SENT:
4093 case IB_CM_REP_SENT:
4094 case IB_CM_MRA_REP_RCVD:
4095 case IB_CM_ESTABLISHED:
4096 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
4097 IB_QP_PKEY_INDEX | IB_QP_PORT;
4098 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
4099 if (cm_id_priv->responder_resources)
4100 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
4101 IB_ACCESS_REMOTE_ATOMIC;
4102 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
4103 qp_attr->port_num = cm_id_priv->av.port->port_num;
4104 ret = 0;
4105 break;
4106 default:
4107 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
4108 __func__, be32_to_cpu(cm_id_priv->id.local_id),
4109 cm_id_priv->id.state);
4110 ret = -EINVAL;
4111 break;
4112 }
4113 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4114 return ret;
4115 }
4116
cm_init_qp_rtr_attr(struct cm_id_private * cm_id_priv,struct ib_qp_attr * qp_attr,int * qp_attr_mask)4117 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
4118 struct ib_qp_attr *qp_attr,
4119 int *qp_attr_mask)
4120 {
4121 unsigned long flags;
4122 int ret;
4123
4124 spin_lock_irqsave(&cm_id_priv->lock, flags);
4125 switch (cm_id_priv->id.state) {
4126 case IB_CM_REQ_RCVD:
4127 case IB_CM_MRA_REQ_SENT:
4128 case IB_CM_REP_RCVD:
4129 case IB_CM_MRA_REP_SENT:
4130 case IB_CM_REP_SENT:
4131 case IB_CM_MRA_REP_RCVD:
4132 case IB_CM_ESTABLISHED:
4133 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
4134 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
4135 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
4136 qp_attr->path_mtu = cm_id_priv->path_mtu;
4137 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
4138 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
4139 if (cm_id_priv->qp_type == IB_QPT_RC ||
4140 cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
4141 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
4142 IB_QP_MIN_RNR_TIMER;
4143 qp_attr->max_dest_rd_atomic =
4144 cm_id_priv->responder_resources;
4145 qp_attr->min_rnr_timer = 0;
4146 }
4147 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) {
4148 *qp_attr_mask |= IB_QP_ALT_PATH;
4149 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
4150 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4151 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4152 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4153 }
4154 ret = 0;
4155 break;
4156 default:
4157 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
4158 __func__, be32_to_cpu(cm_id_priv->id.local_id),
4159 cm_id_priv->id.state);
4160 ret = -EINVAL;
4161 break;
4162 }
4163 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4164 return ret;
4165 }
4166
cm_init_qp_rts_attr(struct cm_id_private * cm_id_priv,struct ib_qp_attr * qp_attr,int * qp_attr_mask)4167 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
4168 struct ib_qp_attr *qp_attr,
4169 int *qp_attr_mask)
4170 {
4171 unsigned long flags;
4172 int ret;
4173
4174 spin_lock_irqsave(&cm_id_priv->lock, flags);
4175 switch (cm_id_priv->id.state) {
4176 /* Allow transition to RTS before sending REP */
4177 case IB_CM_REQ_RCVD:
4178 case IB_CM_MRA_REQ_SENT:
4179
4180 case IB_CM_REP_RCVD:
4181 case IB_CM_MRA_REP_SENT:
4182 case IB_CM_REP_SENT:
4183 case IB_CM_MRA_REP_RCVD:
4184 case IB_CM_ESTABLISHED:
4185 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
4186 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
4187 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
4188 switch (cm_id_priv->qp_type) {
4189 case IB_QPT_RC:
4190 case IB_QPT_XRC_INI:
4191 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
4192 IB_QP_MAX_QP_RD_ATOMIC;
4193 qp_attr->retry_cnt = cm_id_priv->retry_count;
4194 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
4195 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
4196 /* fall through */
4197 case IB_QPT_XRC_TGT:
4198 *qp_attr_mask |= IB_QP_TIMEOUT;
4199 qp_attr->timeout = cm_id_priv->av.timeout;
4200 break;
4201 default:
4202 break;
4203 }
4204 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) {
4205 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
4206 qp_attr->path_mig_state = IB_MIG_REARM;
4207 }
4208 } else {
4209 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
4210 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
4211 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4212 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4213 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4214 qp_attr->path_mig_state = IB_MIG_REARM;
4215 }
4216 ret = 0;
4217 break;
4218 default:
4219 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
4220 __func__, be32_to_cpu(cm_id_priv->id.local_id),
4221 cm_id_priv->id.state);
4222 ret = -EINVAL;
4223 break;
4224 }
4225 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4226 return ret;
4227 }
4228
ib_cm_init_qp_attr(struct ib_cm_id * cm_id,struct ib_qp_attr * qp_attr,int * qp_attr_mask)4229 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
4230 struct ib_qp_attr *qp_attr,
4231 int *qp_attr_mask)
4232 {
4233 struct cm_id_private *cm_id_priv;
4234 int ret;
4235
4236 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
4237 switch (qp_attr->qp_state) {
4238 case IB_QPS_INIT:
4239 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
4240 break;
4241 case IB_QPS_RTR:
4242 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
4243 break;
4244 case IB_QPS_RTS:
4245 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
4246 break;
4247 default:
4248 ret = -EINVAL;
4249 break;
4250 }
4251 return ret;
4252 }
4253 EXPORT_SYMBOL(ib_cm_init_qp_attr);
4254
cm_show_counter(struct kobject * obj,struct attribute * attr,char * buf)4255 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
4256 char *buf)
4257 {
4258 struct cm_counter_group *group;
4259 struct cm_counter_attribute *cm_attr;
4260
4261 group = container_of(obj, struct cm_counter_group, obj);
4262 cm_attr = container_of(attr, struct cm_counter_attribute, attr);
4263
4264 return sprintf(buf, "%ld\n",
4265 atomic_long_read(&group->counter[cm_attr->index]));
4266 }
4267
4268 static const struct sysfs_ops cm_counter_ops = {
4269 .show = cm_show_counter
4270 };
4271
4272 static struct kobj_type cm_counter_obj_type = {
4273 .sysfs_ops = &cm_counter_ops,
4274 .default_attrs = cm_counter_default_attrs
4275 };
4276
cm_release_port_obj(struct kobject * obj)4277 static void cm_release_port_obj(struct kobject *obj)
4278 {
4279 struct cm_port *cm_port;
4280
4281 cm_port = container_of(obj, struct cm_port, port_obj);
4282 kfree(cm_port);
4283 }
4284
4285 static struct kobj_type cm_port_obj_type = {
4286 .release = cm_release_port_obj
4287 };
4288
cm_devnode(struct device * dev,umode_t * mode)4289 static char *cm_devnode(struct device *dev, umode_t *mode)
4290 {
4291 if (mode)
4292 *mode = 0666;
4293 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
4294 }
4295
4296 struct class cm_class = {
4297 .owner = THIS_MODULE,
4298 .name = "infiniband_cm",
4299 .devnode = cm_devnode,
4300 };
4301 EXPORT_SYMBOL(cm_class);
4302
cm_create_port_fs(struct cm_port * port)4303 static int cm_create_port_fs(struct cm_port *port)
4304 {
4305 int i, ret;
4306
4307 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type,
4308 &port->cm_dev->device->kobj,
4309 "%d", port->port_num);
4310 if (ret) {
4311 kfree(port);
4312 return ret;
4313 }
4314
4315 for (i = 0; i < CM_COUNTER_GROUPS; i++) {
4316 ret = kobject_init_and_add(&port->counter_group[i].obj,
4317 &cm_counter_obj_type,
4318 &port->port_obj,
4319 "%s", counter_group_names[i]);
4320 if (ret)
4321 goto error;
4322 }
4323
4324 return 0;
4325
4326 error:
4327 while (i--)
4328 kobject_put(&port->counter_group[i].obj);
4329 kobject_put(&port->port_obj);
4330 return ret;
4331
4332 }
4333
cm_remove_port_fs(struct cm_port * port)4334 static void cm_remove_port_fs(struct cm_port *port)
4335 {
4336 int i;
4337
4338 for (i = 0; i < CM_COUNTER_GROUPS; i++)
4339 kobject_put(&port->counter_group[i].obj);
4340
4341 kobject_put(&port->port_obj);
4342 }
4343
cm_add_one(struct ib_device * ib_device)4344 static void cm_add_one(struct ib_device *ib_device)
4345 {
4346 struct cm_device *cm_dev;
4347 struct cm_port *port;
4348 struct ib_mad_reg_req reg_req = {
4349 .mgmt_class = IB_MGMT_CLASS_CM,
4350 .mgmt_class_version = IB_CM_CLASS_VERSION,
4351 };
4352 struct ib_port_modify port_modify = {
4353 .set_port_cap_mask = IB_PORT_CM_SUP
4354 };
4355 unsigned long flags;
4356 int ret;
4357 int count = 0;
4358 u8 i;
4359
4360 cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt),
4361 GFP_KERNEL);
4362 if (!cm_dev)
4363 return;
4364
4365 cm_dev->ib_device = ib_device;
4366 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay;
4367 cm_dev->going_down = 0;
4368 cm_dev->device = device_create(&cm_class, &ib_device->dev,
4369 MKDEV(0, 0), NULL,
4370 "%s", ib_device->name);
4371 if (IS_ERR(cm_dev->device)) {
4372 kfree(cm_dev);
4373 return;
4374 }
4375
4376 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
4377 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
4378 if (!rdma_cap_ib_cm(ib_device, i))
4379 continue;
4380
4381 port = kzalloc(sizeof *port, GFP_KERNEL);
4382 if (!port)
4383 goto error1;
4384
4385 cm_dev->port[i-1] = port;
4386 port->cm_dev = cm_dev;
4387 port->port_num = i;
4388
4389 INIT_LIST_HEAD(&port->cm_priv_prim_list);
4390 INIT_LIST_HEAD(&port->cm_priv_altr_list);
4391
4392 ret = cm_create_port_fs(port);
4393 if (ret)
4394 goto error1;
4395
4396 port->mad_agent = ib_register_mad_agent(ib_device, i,
4397 IB_QPT_GSI,
4398 ®_req,
4399 0,
4400 cm_send_handler,
4401 cm_recv_handler,
4402 port,
4403 0);
4404 if (IS_ERR(port->mad_agent))
4405 goto error2;
4406
4407 ret = ib_modify_port(ib_device, i, 0, &port_modify);
4408 if (ret)
4409 goto error3;
4410
4411 count++;
4412 }
4413
4414 if (!count)
4415 goto free;
4416
4417 ib_set_client_data(ib_device, &cm_client, cm_dev);
4418
4419 write_lock_irqsave(&cm.device_lock, flags);
4420 list_add_tail(&cm_dev->list, &cm.device_list);
4421 write_unlock_irqrestore(&cm.device_lock, flags);
4422 return;
4423
4424 error3:
4425 ib_unregister_mad_agent(port->mad_agent);
4426 error2:
4427 cm_remove_port_fs(port);
4428 error1:
4429 port_modify.set_port_cap_mask = 0;
4430 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
4431 while (--i) {
4432 if (!rdma_cap_ib_cm(ib_device, i))
4433 continue;
4434
4435 port = cm_dev->port[i-1];
4436 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4437 ib_unregister_mad_agent(port->mad_agent);
4438 cm_remove_port_fs(port);
4439 }
4440 free:
4441 device_unregister(cm_dev->device);
4442 kfree(cm_dev);
4443 }
4444
cm_remove_one(struct ib_device * ib_device,void * client_data)4445 static void cm_remove_one(struct ib_device *ib_device, void *client_data)
4446 {
4447 struct cm_device *cm_dev = client_data;
4448 struct cm_port *port;
4449 struct cm_id_private *cm_id_priv;
4450 struct ib_mad_agent *cur_mad_agent;
4451 struct ib_port_modify port_modify = {
4452 .clr_port_cap_mask = IB_PORT_CM_SUP
4453 };
4454 unsigned long flags;
4455 int i;
4456
4457 if (!cm_dev)
4458 return;
4459
4460 write_lock_irqsave(&cm.device_lock, flags);
4461 list_del(&cm_dev->list);
4462 write_unlock_irqrestore(&cm.device_lock, flags);
4463
4464 spin_lock_irq(&cm.lock);
4465 cm_dev->going_down = 1;
4466 spin_unlock_irq(&cm.lock);
4467
4468 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
4469 if (!rdma_cap_ib_cm(ib_device, i))
4470 continue;
4471
4472 port = cm_dev->port[i-1];
4473 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4474 /* Mark all the cm_id's as not valid */
4475 spin_lock_irq(&cm.lock);
4476 list_for_each_entry(cm_id_priv, &port->cm_priv_altr_list, altr_list)
4477 cm_id_priv->altr_send_port_not_ready = 1;
4478 list_for_each_entry(cm_id_priv, &port->cm_priv_prim_list, prim_list)
4479 cm_id_priv->prim_send_port_not_ready = 1;
4480 spin_unlock_irq(&cm.lock);
4481 /*
4482 * We flush the queue here after the going_down set, this
4483 * verify that no new works will be queued in the recv handler,
4484 * after that we can call the unregister_mad_agent
4485 */
4486 flush_workqueue(cm.wq);
4487 spin_lock_irq(&cm.state_lock);
4488 cur_mad_agent = port->mad_agent;
4489 port->mad_agent = NULL;
4490 spin_unlock_irq(&cm.state_lock);
4491 ib_unregister_mad_agent(cur_mad_agent);
4492 cm_remove_port_fs(port);
4493 }
4494
4495 device_unregister(cm_dev->device);
4496 kfree(cm_dev);
4497 }
4498
ib_cm_init(void)4499 static int __init ib_cm_init(void)
4500 {
4501 int ret;
4502
4503 memset(&cm, 0, sizeof cm);
4504 INIT_LIST_HEAD(&cm.device_list);
4505 rwlock_init(&cm.device_lock);
4506 spin_lock_init(&cm.lock);
4507 spin_lock_init(&cm.state_lock);
4508 cm.listen_service_table = RB_ROOT;
4509 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
4510 cm.remote_id_table = RB_ROOT;
4511 cm.remote_qp_table = RB_ROOT;
4512 cm.remote_sidr_table = RB_ROOT;
4513 idr_init(&cm.local_id_table);
4514 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
4515 INIT_LIST_HEAD(&cm.timewait_list);
4516
4517 ret = class_register(&cm_class);
4518 if (ret) {
4519 ret = -ENOMEM;
4520 goto error1;
4521 }
4522
4523 cm.wq = alloc_workqueue("ib_cm", 0, 1);
4524 if (!cm.wq) {
4525 ret = -ENOMEM;
4526 goto error2;
4527 }
4528
4529 ret = ib_register_client(&cm_client);
4530 if (ret)
4531 goto error3;
4532
4533 return 0;
4534 error3:
4535 destroy_workqueue(cm.wq);
4536 error2:
4537 class_unregister(&cm_class);
4538 error1:
4539 idr_destroy(&cm.local_id_table);
4540 return ret;
4541 }
4542
ib_cm_cleanup(void)4543 static void __exit ib_cm_cleanup(void)
4544 {
4545 struct cm_timewait_info *timewait_info, *tmp;
4546
4547 spin_lock_irq(&cm.lock);
4548 list_for_each_entry(timewait_info, &cm.timewait_list, list)
4549 cancel_delayed_work(&timewait_info->work.work);
4550 spin_unlock_irq(&cm.lock);
4551
4552 ib_unregister_client(&cm_client);
4553 destroy_workqueue(cm.wq);
4554
4555 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
4556 list_del(&timewait_info->list);
4557 kfree(timewait_info);
4558 }
4559
4560 class_unregister(&cm_class);
4561 idr_destroy(&cm.local_id_table);
4562 }
4563
4564 module_init(ib_cm_init);
4565 module_exit(ib_cm_cleanup);
4566
4567
