1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2 /*
3 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved.
4 * Copyright (c) 2004 Topspin Corporation. All rights reserved.
5 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved.
6 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
7 * Copyright (c) 2019, Mellanox Technologies inc. All rights reserved.
8 */
9
10 #include <linux/completion.h>
11 #include <linux/dma-mapping.h>
12 #include <linux/device.h>
13 #include <linux/module.h>
14 #include <linux/err.h>
15 #include <linux/idr.h>
16 #include <linux/interrupt.h>
17 #include <linux/random.h>
18 #include <linux/rbtree.h>
19 #include <linux/spinlock.h>
20 #include <linux/slab.h>
21 #include <linux/sysfs.h>
22 #include <linux/workqueue.h>
23 #include <linux/kdev_t.h>
24 #include <linux/etherdevice.h>
25
26 #include <rdma/ib_cache.h>
27 #include <rdma/ib_cm.h>
28 #include <rdma/ib_sysfs.h>
29 #include "cm_msgs.h"
30 #include "core_priv.h"
31 #include "cm_trace.h"
32
33 MODULE_AUTHOR("Sean Hefty");
34 MODULE_DESCRIPTION("InfiniBand CM");
35 MODULE_LICENSE("Dual BSD/GPL");
36
37 static const char * const ibcm_rej_reason_strs[] = {
38 [IB_CM_REJ_NO_QP] = "no QP",
39 [IB_CM_REJ_NO_EEC] = "no EEC",
40 [IB_CM_REJ_NO_RESOURCES] = "no resources",
41 [IB_CM_REJ_TIMEOUT] = "timeout",
42 [IB_CM_REJ_UNSUPPORTED] = "unsupported",
43 [IB_CM_REJ_INVALID_COMM_ID] = "invalid comm ID",
44 [IB_CM_REJ_INVALID_COMM_INSTANCE] = "invalid comm instance",
45 [IB_CM_REJ_INVALID_SERVICE_ID] = "invalid service ID",
46 [IB_CM_REJ_INVALID_TRANSPORT_TYPE] = "invalid transport type",
47 [IB_CM_REJ_STALE_CONN] = "stale conn",
48 [IB_CM_REJ_RDC_NOT_EXIST] = "RDC not exist",
49 [IB_CM_REJ_INVALID_GID] = "invalid GID",
50 [IB_CM_REJ_INVALID_LID] = "invalid LID",
51 [IB_CM_REJ_INVALID_SL] = "invalid SL",
52 [IB_CM_REJ_INVALID_TRAFFIC_CLASS] = "invalid traffic class",
53 [IB_CM_REJ_INVALID_HOP_LIMIT] = "invalid hop limit",
54 [IB_CM_REJ_INVALID_PACKET_RATE] = "invalid packet rate",
55 [IB_CM_REJ_INVALID_ALT_GID] = "invalid alt GID",
56 [IB_CM_REJ_INVALID_ALT_LID] = "invalid alt LID",
57 [IB_CM_REJ_INVALID_ALT_SL] = "invalid alt SL",
58 [IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS] = "invalid alt traffic class",
59 [IB_CM_REJ_INVALID_ALT_HOP_LIMIT] = "invalid alt hop limit",
60 [IB_CM_REJ_INVALID_ALT_PACKET_RATE] = "invalid alt packet rate",
61 [IB_CM_REJ_PORT_CM_REDIRECT] = "port CM redirect",
62 [IB_CM_REJ_PORT_REDIRECT] = "port redirect",
63 [IB_CM_REJ_INVALID_MTU] = "invalid MTU",
64 [IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES] = "insufficient resp resources",
65 [IB_CM_REJ_CONSUMER_DEFINED] = "consumer defined",
66 [IB_CM_REJ_INVALID_RNR_RETRY] = "invalid RNR retry",
67 [IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID] = "duplicate local comm ID",
68 [IB_CM_REJ_INVALID_CLASS_VERSION] = "invalid class version",
69 [IB_CM_REJ_INVALID_FLOW_LABEL] = "invalid flow label",
70 [IB_CM_REJ_INVALID_ALT_FLOW_LABEL] = "invalid alt flow label",
71 [IB_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED] =
72 "vendor option is not supported",
73 };
74
ibcm_reject_msg(int reason)75 const char *__attribute_const__ ibcm_reject_msg(int reason)
76 {
77 size_t index = reason;
78
79 if (index < ARRAY_SIZE(ibcm_rej_reason_strs) &&
80 ibcm_rej_reason_strs[index])
81 return ibcm_rej_reason_strs[index];
82 else
83 return "unrecognized reason";
84 }
85 EXPORT_SYMBOL(ibcm_reject_msg);
86
87 struct cm_id_private;
88 struct cm_work;
89 static int cm_add_one(struct ib_device *device);
90 static void cm_remove_one(struct ib_device *device, void *client_data);
91 static void cm_process_work(struct cm_id_private *cm_id_priv,
92 struct cm_work *work);
93 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv,
94 struct ib_cm_sidr_rep_param *param);
95 static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv,
96 const void *private_data, u8 private_data_len);
97 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv,
98 void *private_data, u8 private_data_len);
99 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv,
100 enum ib_cm_rej_reason reason, void *ari,
101 u8 ari_length, const void *private_data,
102 u8 private_data_len);
103
104 static struct ib_client cm_client = {
105 .name = "cm",
106 .add = cm_add_one,
107 .remove = cm_remove_one
108 };
109
110 static struct ib_cm {
111 spinlock_t lock;
112 struct list_head device_list;
113 rwlock_t device_lock;
114 struct rb_root listen_service_table;
115 u64 listen_service_id;
116 /* struct rb_root peer_service_table; todo: fix peer to peer */
117 struct rb_root remote_qp_table;
118 struct rb_root remote_id_table;
119 struct rb_root remote_sidr_table;
120 struct xarray local_id_table;
121 u32 local_id_next;
122 __be32 random_id_operand;
123 struct list_head timewait_list;
124 struct workqueue_struct *wq;
125 } cm;
126
127 /* Counter indexes ordered by attribute ID */
128 enum {
129 CM_REQ_COUNTER,
130 CM_MRA_COUNTER,
131 CM_REJ_COUNTER,
132 CM_REP_COUNTER,
133 CM_RTU_COUNTER,
134 CM_DREQ_COUNTER,
135 CM_DREP_COUNTER,
136 CM_SIDR_REQ_COUNTER,
137 CM_SIDR_REP_COUNTER,
138 CM_LAP_COUNTER,
139 CM_APR_COUNTER,
140 CM_ATTR_COUNT,
141 CM_ATTR_ID_OFFSET = 0x0010,
142 };
143
144 enum {
145 CM_XMIT,
146 CM_XMIT_RETRIES,
147 CM_RECV,
148 CM_RECV_DUPLICATES,
149 CM_COUNTER_GROUPS
150 };
151
152 struct cm_counter_attribute {
153 struct ib_port_attribute attr;
154 unsigned short group;
155 unsigned short index;
156 };
157
158 struct cm_port {
159 struct cm_device *cm_dev;
160 struct ib_mad_agent *mad_agent;
161 u32 port_num;
162 atomic_long_t counters[CM_COUNTER_GROUPS][CM_ATTR_COUNT];
163 };
164
165 struct cm_device {
166 struct kref kref;
167 struct list_head list;
168 spinlock_t mad_agent_lock;
169 struct ib_device *ib_device;
170 u8 ack_delay;
171 int going_down;
172 struct cm_port *port[];
173 };
174
175 struct cm_av {
176 struct cm_port *port;
177 struct rdma_ah_attr ah_attr;
178 u16 dlid_datapath;
179 u16 pkey_index;
180 u8 timeout;
181 };
182
183 struct cm_work {
184 struct delayed_work work;
185 struct list_head list;
186 struct cm_port *port;
187 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
188 __be32 local_id; /* Established / timewait */
189 __be32 remote_id;
190 struct ib_cm_event cm_event;
191 struct sa_path_rec path[];
192 };
193
194 struct cm_timewait_info {
195 struct cm_work work;
196 struct list_head list;
197 struct rb_node remote_qp_node;
198 struct rb_node remote_id_node;
199 __be64 remote_ca_guid;
200 __be32 remote_qpn;
201 u8 inserted_remote_qp;
202 u8 inserted_remote_id;
203 };
204
205 struct cm_id_private {
206 struct ib_cm_id id;
207
208 struct rb_node service_node;
209 struct rb_node sidr_id_node;
210 u32 sidr_slid;
211 spinlock_t lock; /* Do not acquire inside cm.lock */
212 struct completion comp;
213 refcount_t refcount;
214 /* Number of clients sharing this ib_cm_id. Only valid for listeners.
215 * Protected by the cm.lock spinlock.
216 */
217 int listen_sharecount;
218 struct rcu_head rcu;
219
220 struct ib_mad_send_buf *msg;
221 struct cm_timewait_info *timewait_info;
222 /* todo: use alternate port on send failure */
223 struct cm_av av;
224 struct cm_av alt_av;
225
226 void *private_data;
227 __be64 tid;
228 __be32 local_qpn;
229 __be32 remote_qpn;
230 enum ib_qp_type qp_type;
231 __be32 sq_psn;
232 __be32 rq_psn;
233 int timeout_ms;
234 enum ib_mtu path_mtu;
235 __be16 pkey;
236 u8 private_data_len;
237 u8 max_cm_retries;
238 u8 responder_resources;
239 u8 initiator_depth;
240 u8 retry_count;
241 u8 rnr_retry_count;
242 u8 service_timeout;
243 u8 target_ack_delay;
244
245 struct list_head work_list;
246 atomic_t work_count;
247
248 struct rdma_ucm_ece ece;
249 };
250
cm_dev_release(struct kref * kref)251 static void cm_dev_release(struct kref *kref)
252 {
253 struct cm_device *cm_dev = container_of(kref, struct cm_device, kref);
254 u32 i;
255
256 rdma_for_each_port(cm_dev->ib_device, i)
257 kfree(cm_dev->port[i - 1]);
258
259 kfree(cm_dev);
260 }
261
cm_device_put(struct cm_device * cm_dev)262 static void cm_device_put(struct cm_device *cm_dev)
263 {
264 kref_put(&cm_dev->kref, cm_dev_release);
265 }
266
267 static void cm_work_handler(struct work_struct *work);
268
cm_deref_id(struct cm_id_private * cm_id_priv)269 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
270 {
271 if (refcount_dec_and_test(&cm_id_priv->refcount))
272 complete(&cm_id_priv->comp);
273 }
274
cm_alloc_msg(struct cm_id_private * cm_id_priv)275 static struct ib_mad_send_buf *cm_alloc_msg(struct cm_id_private *cm_id_priv)
276 {
277 struct ib_mad_agent *mad_agent;
278 struct ib_mad_send_buf *m;
279 struct ib_ah *ah;
280
281 lockdep_assert_held(&cm_id_priv->lock);
282
283 if (!cm_id_priv->av.port)
284 return ERR_PTR(-EINVAL);
285
286 spin_lock(&cm_id_priv->av.port->cm_dev->mad_agent_lock);
287 mad_agent = cm_id_priv->av.port->mad_agent;
288 if (!mad_agent) {
289 m = ERR_PTR(-EINVAL);
290 goto out;
291 }
292
293 ah = rdma_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr, 0);
294 if (IS_ERR(ah)) {
295 m = ERR_CAST(ah);
296 goto out;
297 }
298
299 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
300 cm_id_priv->av.pkey_index,
301 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
302 GFP_ATOMIC,
303 IB_MGMT_BASE_VERSION);
304 if (IS_ERR(m)) {
305 rdma_destroy_ah(ah, 0);
306 goto out;
307 }
308
309 /* Timeout set by caller if response is expected. */
310 m->ah = ah;
311 m->retries = cm_id_priv->max_cm_retries;
312
313 refcount_inc(&cm_id_priv->refcount);
314 m->context[0] = cm_id_priv;
315
316 out:
317 spin_unlock(&cm_id_priv->av.port->cm_dev->mad_agent_lock);
318 return m;
319 }
320
cm_free_msg(struct ib_mad_send_buf * msg)321 static void cm_free_msg(struct ib_mad_send_buf *msg)
322 {
323 struct cm_id_private *cm_id_priv = msg->context[0];
324
325 if (msg->ah)
326 rdma_destroy_ah(msg->ah, 0);
327 cm_deref_id(cm_id_priv);
328 ib_free_send_mad(msg);
329 }
330
331 static struct ib_mad_send_buf *
cm_alloc_priv_msg(struct cm_id_private * cm_id_priv)332 cm_alloc_priv_msg(struct cm_id_private *cm_id_priv)
333 {
334 struct ib_mad_send_buf *msg;
335
336 lockdep_assert_held(&cm_id_priv->lock);
337
338 msg = cm_alloc_msg(cm_id_priv);
339 if (IS_ERR(msg))
340 return msg;
341 cm_id_priv->msg = msg;
342 return msg;
343 }
344
cm_free_priv_msg(struct ib_mad_send_buf * msg)345 static void cm_free_priv_msg(struct ib_mad_send_buf *msg)
346 {
347 struct cm_id_private *cm_id_priv = msg->context[0];
348
349 lockdep_assert_held(&cm_id_priv->lock);
350
351 if (!WARN_ON(cm_id_priv->msg != msg))
352 cm_id_priv->msg = NULL;
353
354 if (msg->ah)
355 rdma_destroy_ah(msg->ah, 0);
356 cm_deref_id(cm_id_priv);
357 ib_free_send_mad(msg);
358 }
359
cm_alloc_response_msg_no_ah(struct cm_port * port,struct ib_mad_recv_wc * mad_recv_wc)360 static struct ib_mad_send_buf *cm_alloc_response_msg_no_ah(struct cm_port *port,
361 struct ib_mad_recv_wc *mad_recv_wc)
362 {
363 return ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
364 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
365 GFP_ATOMIC,
366 IB_MGMT_BASE_VERSION);
367 }
368
cm_create_response_msg_ah(struct cm_port * port,struct ib_mad_recv_wc * mad_recv_wc,struct ib_mad_send_buf * msg)369 static int cm_create_response_msg_ah(struct cm_port *port,
370 struct ib_mad_recv_wc *mad_recv_wc,
371 struct ib_mad_send_buf *msg)
372 {
373 struct ib_ah *ah;
374
375 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
376 mad_recv_wc->recv_buf.grh, port->port_num);
377 if (IS_ERR(ah))
378 return PTR_ERR(ah);
379
380 msg->ah = ah;
381 return 0;
382 }
383
cm_alloc_response_msg(struct cm_port * port,struct ib_mad_recv_wc * mad_recv_wc,struct ib_mad_send_buf ** msg)384 static int cm_alloc_response_msg(struct cm_port *port,
385 struct ib_mad_recv_wc *mad_recv_wc,
386 struct ib_mad_send_buf **msg)
387 {
388 struct ib_mad_send_buf *m;
389 int ret;
390
391 m = cm_alloc_response_msg_no_ah(port, mad_recv_wc);
392 if (IS_ERR(m))
393 return PTR_ERR(m);
394
395 ret = cm_create_response_msg_ah(port, mad_recv_wc, m);
396 if (ret) {
397 ib_free_send_mad(m);
398 return ret;
399 }
400
401 *msg = m;
402 return 0;
403 }
404
cm_free_response_msg(struct ib_mad_send_buf * msg)405 static void cm_free_response_msg(struct ib_mad_send_buf *msg)
406 {
407 if (msg->ah)
408 rdma_destroy_ah(msg->ah, 0);
409 ib_free_send_mad(msg);
410 }
411
cm_copy_private_data(const void * private_data,u8 private_data_len)412 static void *cm_copy_private_data(const void *private_data, u8 private_data_len)
413 {
414 void *data;
415
416 if (!private_data || !private_data_len)
417 return NULL;
418
419 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
420 if (!data)
421 return ERR_PTR(-ENOMEM);
422
423 return data;
424 }
425
cm_set_private_data(struct cm_id_private * cm_id_priv,void * private_data,u8 private_data_len)426 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
427 void *private_data, u8 private_data_len)
428 {
429 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
430 kfree(cm_id_priv->private_data);
431
432 cm_id_priv->private_data = private_data;
433 cm_id_priv->private_data_len = private_data_len;
434 }
435
cm_set_av_port(struct cm_av * av,struct cm_port * port)436 static void cm_set_av_port(struct cm_av *av, struct cm_port *port)
437 {
438 struct cm_port *old_port = av->port;
439
440 if (old_port == port)
441 return;
442
443 av->port = port;
444 if (old_port)
445 cm_device_put(old_port->cm_dev);
446 if (port)
447 kref_get(&port->cm_dev->kref);
448 }
449
cm_init_av_for_lap(struct cm_port * port,struct ib_wc * wc,struct rdma_ah_attr * ah_attr,struct cm_av * av)450 static void cm_init_av_for_lap(struct cm_port *port, struct ib_wc *wc,
451 struct rdma_ah_attr *ah_attr, struct cm_av *av)
452 {
453 cm_set_av_port(av, port);
454 av->pkey_index = wc->pkey_index;
455 rdma_move_ah_attr(&av->ah_attr, ah_attr);
456 }
457
cm_init_av_for_response(struct cm_port * port,struct ib_wc * wc,struct ib_grh * grh,struct cm_av * av)458 static int cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
459 struct ib_grh *grh, struct cm_av *av)
460 {
461 cm_set_av_port(av, port);
462 av->pkey_index = wc->pkey_index;
463 return ib_init_ah_attr_from_wc(port->cm_dev->ib_device,
464 port->port_num, wc,
465 grh, &av->ah_attr);
466 }
467
468 static struct cm_port *
get_cm_port_from_path(struct sa_path_rec * path,const struct ib_gid_attr * attr)469 get_cm_port_from_path(struct sa_path_rec *path, const struct ib_gid_attr *attr)
470 {
471 struct cm_device *cm_dev;
472 struct cm_port *port = NULL;
473 unsigned long flags;
474
475 if (attr) {
476 read_lock_irqsave(&cm.device_lock, flags);
477 list_for_each_entry(cm_dev, &cm.device_list, list) {
478 if (cm_dev->ib_device == attr->device) {
479 port = cm_dev->port[attr->port_num - 1];
480 break;
481 }
482 }
483 read_unlock_irqrestore(&cm.device_lock, flags);
484 } else {
485 /* SGID attribute can be NULL in following
486 * conditions.
487 * (a) Alternative path
488 * (b) IB link layer without GRH
489 * (c) LAP send messages
490 */
491 read_lock_irqsave(&cm.device_lock, flags);
492 list_for_each_entry(cm_dev, &cm.device_list, list) {
493 attr = rdma_find_gid(cm_dev->ib_device,
494 &path->sgid,
495 sa_conv_pathrec_to_gid_type(path),
496 NULL);
497 if (!IS_ERR(attr)) {
498 port = cm_dev->port[attr->port_num - 1];
499 break;
500 }
501 }
502 read_unlock_irqrestore(&cm.device_lock, flags);
503 if (port)
504 rdma_put_gid_attr(attr);
505 }
506 return port;
507 }
508
cm_init_av_by_path(struct sa_path_rec * path,const struct ib_gid_attr * sgid_attr,struct cm_av * av)509 static int cm_init_av_by_path(struct sa_path_rec *path,
510 const struct ib_gid_attr *sgid_attr,
511 struct cm_av *av)
512 {
513 struct rdma_ah_attr new_ah_attr;
514 struct cm_device *cm_dev;
515 struct cm_port *port;
516 int ret;
517
518 port = get_cm_port_from_path(path, sgid_attr);
519 if (!port)
520 return -EINVAL;
521 cm_dev = port->cm_dev;
522
523 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
524 be16_to_cpu(path->pkey), &av->pkey_index);
525 if (ret)
526 return ret;
527
528 cm_set_av_port(av, port);
529
530 /*
531 * av->ah_attr might be initialized based on wc or during
532 * request processing time which might have reference to sgid_attr.
533 * So initialize a new ah_attr on stack.
534 * If initialization fails, old ah_attr is used for sending any
535 * responses. If initialization is successful, than new ah_attr
536 * is used by overwriting the old one. So that right ah_attr
537 * can be used to return an error response.
538 */
539 ret = ib_init_ah_attr_from_path(cm_dev->ib_device, port->port_num, path,
540 &new_ah_attr, sgid_attr);
541 if (ret)
542 return ret;
543
544 av->timeout = path->packet_life_time + 1;
545 rdma_move_ah_attr(&av->ah_attr, &new_ah_attr);
546 return 0;
547 }
548
549 /* Move av created by cm_init_av_by_path(), so av.dgid is not moved */
cm_move_av_from_path(struct cm_av * dest,struct cm_av * src)550 static void cm_move_av_from_path(struct cm_av *dest, struct cm_av *src)
551 {
552 cm_set_av_port(dest, src->port);
553 cm_set_av_port(src, NULL);
554 dest->pkey_index = src->pkey_index;
555 rdma_move_ah_attr(&dest->ah_attr, &src->ah_attr);
556 dest->timeout = src->timeout;
557 }
558
cm_destroy_av(struct cm_av * av)559 static void cm_destroy_av(struct cm_av *av)
560 {
561 rdma_destroy_ah_attr(&av->ah_attr);
562 cm_set_av_port(av, NULL);
563 }
564
cm_local_id(__be32 local_id)565 static u32 cm_local_id(__be32 local_id)
566 {
567 return (__force u32) (local_id ^ cm.random_id_operand);
568 }
569
cm_acquire_id(__be32 local_id,__be32 remote_id)570 static struct cm_id_private *cm_acquire_id(__be32 local_id, __be32 remote_id)
571 {
572 struct cm_id_private *cm_id_priv;
573
574 rcu_read_lock();
575 cm_id_priv = xa_load(&cm.local_id_table, cm_local_id(local_id));
576 if (!cm_id_priv || cm_id_priv->id.remote_id != remote_id ||
577 !refcount_inc_not_zero(&cm_id_priv->refcount))
578 cm_id_priv = NULL;
579 rcu_read_unlock();
580
581 return cm_id_priv;
582 }
583
584 /*
585 * Trivial helpers to strip endian annotation and compare; the
586 * endianness doesn't actually matter since we just need a stable
587 * order for the RB tree.
588 */
be32_lt(__be32 a,__be32 b)589 static int be32_lt(__be32 a, __be32 b)
590 {
591 return (__force u32) a < (__force u32) b;
592 }
593
be32_gt(__be32 a,__be32 b)594 static int be32_gt(__be32 a, __be32 b)
595 {
596 return (__force u32) a > (__force u32) b;
597 }
598
be64_lt(__be64 a,__be64 b)599 static int be64_lt(__be64 a, __be64 b)
600 {
601 return (__force u64) a < (__force u64) b;
602 }
603
be64_gt(__be64 a,__be64 b)604 static int be64_gt(__be64 a, __be64 b)
605 {
606 return (__force u64) a > (__force u64) b;
607 }
608
609 /*
610 * Inserts a new cm_id_priv into the listen_service_table. Returns cm_id_priv
611 * if the new ID was inserted, NULL if it could not be inserted due to a
612 * collision, or the existing cm_id_priv ready for shared usage.
613 */
cm_insert_listen(struct cm_id_private * cm_id_priv,ib_cm_handler shared_handler)614 static struct cm_id_private *cm_insert_listen(struct cm_id_private *cm_id_priv,
615 ib_cm_handler shared_handler)
616 {
617 struct rb_node **link = &cm.listen_service_table.rb_node;
618 struct rb_node *parent = NULL;
619 struct cm_id_private *cur_cm_id_priv;
620 __be64 service_id = cm_id_priv->id.service_id;
621 unsigned long flags;
622
623 spin_lock_irqsave(&cm.lock, flags);
624 while (*link) {
625 parent = *link;
626 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
627 service_node);
628
629 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
630 link = &(*link)->rb_left;
631 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
632 link = &(*link)->rb_right;
633 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
634 link = &(*link)->rb_left;
635 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
636 link = &(*link)->rb_right;
637 else {
638 /*
639 * Sharing an ib_cm_id with different handlers is not
640 * supported
641 */
642 if (cur_cm_id_priv->id.cm_handler != shared_handler ||
643 cur_cm_id_priv->id.context ||
644 WARN_ON(!cur_cm_id_priv->id.cm_handler)) {
645 spin_unlock_irqrestore(&cm.lock, flags);
646 return NULL;
647 }
648 refcount_inc(&cur_cm_id_priv->refcount);
649 cur_cm_id_priv->listen_sharecount++;
650 spin_unlock_irqrestore(&cm.lock, flags);
651 return cur_cm_id_priv;
652 }
653 }
654 cm_id_priv->listen_sharecount++;
655 rb_link_node(&cm_id_priv->service_node, parent, link);
656 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
657 spin_unlock_irqrestore(&cm.lock, flags);
658 return cm_id_priv;
659 }
660
cm_find_listen(struct ib_device * device,__be64 service_id)661 static struct cm_id_private *cm_find_listen(struct ib_device *device,
662 __be64 service_id)
663 {
664 struct rb_node *node = cm.listen_service_table.rb_node;
665 struct cm_id_private *cm_id_priv;
666
667 while (node) {
668 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
669
670 if (device < cm_id_priv->id.device)
671 node = node->rb_left;
672 else if (device > cm_id_priv->id.device)
673 node = node->rb_right;
674 else if (be64_lt(service_id, cm_id_priv->id.service_id))
675 node = node->rb_left;
676 else if (be64_gt(service_id, cm_id_priv->id.service_id))
677 node = node->rb_right;
678 else {
679 refcount_inc(&cm_id_priv->refcount);
680 return cm_id_priv;
681 }
682 }
683 return NULL;
684 }
685
686 static struct cm_timewait_info *
cm_insert_remote_id(struct cm_timewait_info * timewait_info)687 cm_insert_remote_id(struct cm_timewait_info *timewait_info)
688 {
689 struct rb_node **link = &cm.remote_id_table.rb_node;
690 struct rb_node *parent = NULL;
691 struct cm_timewait_info *cur_timewait_info;
692 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
693 __be32 remote_id = timewait_info->work.remote_id;
694
695 while (*link) {
696 parent = *link;
697 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
698 remote_id_node);
699 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
700 link = &(*link)->rb_left;
701 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
702 link = &(*link)->rb_right;
703 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
704 link = &(*link)->rb_left;
705 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
706 link = &(*link)->rb_right;
707 else
708 return cur_timewait_info;
709 }
710 timewait_info->inserted_remote_id = 1;
711 rb_link_node(&timewait_info->remote_id_node, parent, link);
712 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
713 return NULL;
714 }
715
cm_find_remote_id(__be64 remote_ca_guid,__be32 remote_id)716 static struct cm_id_private *cm_find_remote_id(__be64 remote_ca_guid,
717 __be32 remote_id)
718 {
719 struct rb_node *node = cm.remote_id_table.rb_node;
720 struct cm_timewait_info *timewait_info;
721 struct cm_id_private *res = NULL;
722
723 spin_lock_irq(&cm.lock);
724 while (node) {
725 timewait_info = rb_entry(node, struct cm_timewait_info,
726 remote_id_node);
727 if (be32_lt(remote_id, timewait_info->work.remote_id))
728 node = node->rb_left;
729 else if (be32_gt(remote_id, timewait_info->work.remote_id))
730 node = node->rb_right;
731 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
732 node = node->rb_left;
733 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
734 node = node->rb_right;
735 else {
736 res = cm_acquire_id(timewait_info->work.local_id,
737 timewait_info->work.remote_id);
738 break;
739 }
740 }
741 spin_unlock_irq(&cm.lock);
742 return res;
743 }
744
745 static struct cm_timewait_info *
cm_insert_remote_qpn(struct cm_timewait_info * timewait_info)746 cm_insert_remote_qpn(struct cm_timewait_info *timewait_info)
747 {
748 struct rb_node **link = &cm.remote_qp_table.rb_node;
749 struct rb_node *parent = NULL;
750 struct cm_timewait_info *cur_timewait_info;
751 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
752 __be32 remote_qpn = timewait_info->remote_qpn;
753
754 while (*link) {
755 parent = *link;
756 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
757 remote_qp_node);
758 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
759 link = &(*link)->rb_left;
760 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
761 link = &(*link)->rb_right;
762 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
763 link = &(*link)->rb_left;
764 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
765 link = &(*link)->rb_right;
766 else
767 return cur_timewait_info;
768 }
769 timewait_info->inserted_remote_qp = 1;
770 rb_link_node(&timewait_info->remote_qp_node, parent, link);
771 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
772 return NULL;
773 }
774
775 static struct cm_id_private *
cm_insert_remote_sidr(struct cm_id_private * cm_id_priv)776 cm_insert_remote_sidr(struct cm_id_private *cm_id_priv)
777 {
778 struct rb_node **link = &cm.remote_sidr_table.rb_node;
779 struct rb_node *parent = NULL;
780 struct cm_id_private *cur_cm_id_priv;
781 __be32 remote_id = cm_id_priv->id.remote_id;
782
783 while (*link) {
784 parent = *link;
785 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
786 sidr_id_node);
787 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
788 link = &(*link)->rb_left;
789 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
790 link = &(*link)->rb_right;
791 else {
792 if (cur_cm_id_priv->sidr_slid < cm_id_priv->sidr_slid)
793 link = &(*link)->rb_left;
794 else if (cur_cm_id_priv->sidr_slid > cm_id_priv->sidr_slid)
795 link = &(*link)->rb_right;
796 else
797 return cur_cm_id_priv;
798 }
799 }
800 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
801 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
802 return NULL;
803 }
804
cm_alloc_id_priv(struct ib_device * device,ib_cm_handler cm_handler,void * context)805 static struct cm_id_private *cm_alloc_id_priv(struct ib_device *device,
806 ib_cm_handler cm_handler,
807 void *context)
808 {
809 struct cm_id_private *cm_id_priv;
810 u32 id;
811 int ret;
812
813 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
814 if (!cm_id_priv)
815 return ERR_PTR(-ENOMEM);
816
817 cm_id_priv->id.state = IB_CM_IDLE;
818 cm_id_priv->id.device = device;
819 cm_id_priv->id.cm_handler = cm_handler;
820 cm_id_priv->id.context = context;
821 cm_id_priv->id.remote_cm_qpn = 1;
822
823 RB_CLEAR_NODE(&cm_id_priv->service_node);
824 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
825 spin_lock_init(&cm_id_priv->lock);
826 init_completion(&cm_id_priv->comp);
827 INIT_LIST_HEAD(&cm_id_priv->work_list);
828 atomic_set(&cm_id_priv->work_count, -1);
829 refcount_set(&cm_id_priv->refcount, 1);
830
831 ret = xa_alloc_cyclic(&cm.local_id_table, &id, NULL, xa_limit_32b,
832 &cm.local_id_next, GFP_KERNEL);
833 if (ret < 0)
834 goto error;
835 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
836
837 return cm_id_priv;
838
839 error:
840 kfree(cm_id_priv);
841 return ERR_PTR(ret);
842 }
843
844 /*
845 * Make the ID visible to the MAD handlers and other threads that use the
846 * xarray.
847 */
cm_finalize_id(struct cm_id_private * cm_id_priv)848 static void cm_finalize_id(struct cm_id_private *cm_id_priv)
849 {
850 xa_store(&cm.local_id_table, cm_local_id(cm_id_priv->id.local_id),
851 cm_id_priv, GFP_ATOMIC);
852 }
853
ib_create_cm_id(struct ib_device * device,ib_cm_handler cm_handler,void * context)854 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
855 ib_cm_handler cm_handler,
856 void *context)
857 {
858 struct cm_id_private *cm_id_priv;
859
860 cm_id_priv = cm_alloc_id_priv(device, cm_handler, context);
861 if (IS_ERR(cm_id_priv))
862 return ERR_CAST(cm_id_priv);
863
864 cm_finalize_id(cm_id_priv);
865 return &cm_id_priv->id;
866 }
867 EXPORT_SYMBOL(ib_create_cm_id);
868
cm_dequeue_work(struct cm_id_private * cm_id_priv)869 static struct cm_work *cm_dequeue_work(struct cm_id_private *cm_id_priv)
870 {
871 struct cm_work *work;
872
873 if (list_empty(&cm_id_priv->work_list))
874 return NULL;
875
876 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
877 list_del(&work->list);
878 return work;
879 }
880
cm_free_work(struct cm_work * work)881 static void cm_free_work(struct cm_work *work)
882 {
883 if (work->mad_recv_wc)
884 ib_free_recv_mad(work->mad_recv_wc);
885 kfree(work);
886 }
887
cm_queue_work_unlock(struct cm_id_private * cm_id_priv,struct cm_work * work)888 static void cm_queue_work_unlock(struct cm_id_private *cm_id_priv,
889 struct cm_work *work)
890 __releases(&cm_id_priv->lock)
891 {
892 bool immediate;
893
894 /*
895 * To deliver the event to the user callback we have the drop the
896 * spinlock, however, we need to ensure that the user callback is single
897 * threaded and receives events in the temporal order. If there are
898 * already events being processed then thread new events onto a list,
899 * the thread currently processing will pick them up.
900 */
901 immediate = atomic_inc_and_test(&cm_id_priv->work_count);
902 if (!immediate) {
903 list_add_tail(&work->list, &cm_id_priv->work_list);
904 /*
905 * This routine always consumes incoming reference. Once queued
906 * to the work_list then a reference is held by the thread
907 * currently running cm_process_work() and this reference is not
908 * needed.
909 */
910 cm_deref_id(cm_id_priv);
911 }
912 spin_unlock_irq(&cm_id_priv->lock);
913
914 if (immediate)
915 cm_process_work(cm_id_priv, work);
916 }
917
cm_convert_to_ms(int iba_time)918 static inline int cm_convert_to_ms(int iba_time)
919 {
920 /* approximate conversion to ms from 4.096us x 2^iba_time */
921 return 1 << max(iba_time - 8, 0);
922 }
923
924 /*
925 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
926 * Because of how ack_timeout is stored, adding one doubles the timeout.
927 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
928 * increment it (round up) only if the other is within 50%.
929 */
cm_ack_timeout(u8 ca_ack_delay,u8 packet_life_time)930 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
931 {
932 int ack_timeout = packet_life_time + 1;
933
934 if (ack_timeout >= ca_ack_delay)
935 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
936 else
937 ack_timeout = ca_ack_delay +
938 (ack_timeout >= (ca_ack_delay - 1));
939
940 return min(31, ack_timeout);
941 }
942
cm_remove_remote(struct cm_id_private * cm_id_priv)943 static void cm_remove_remote(struct cm_id_private *cm_id_priv)
944 {
945 struct cm_timewait_info *timewait_info = cm_id_priv->timewait_info;
946
947 if (timewait_info->inserted_remote_id) {
948 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
949 timewait_info->inserted_remote_id = 0;
950 }
951
952 if (timewait_info->inserted_remote_qp) {
953 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
954 timewait_info->inserted_remote_qp = 0;
955 }
956 }
957
cm_create_timewait_info(__be32 local_id)958 static struct cm_timewait_info *cm_create_timewait_info(__be32 local_id)
959 {
960 struct cm_timewait_info *timewait_info;
961
962 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
963 if (!timewait_info)
964 return ERR_PTR(-ENOMEM);
965
966 timewait_info->work.local_id = local_id;
967 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
968 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
969 return timewait_info;
970 }
971
cm_enter_timewait(struct cm_id_private * cm_id_priv)972 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
973 {
974 int wait_time;
975 unsigned long flags;
976 struct cm_device *cm_dev;
977
978 lockdep_assert_held(&cm_id_priv->lock);
979
980 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client);
981 if (!cm_dev)
982 return;
983
984 spin_lock_irqsave(&cm.lock, flags);
985 cm_remove_remote(cm_id_priv);
986 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
987 spin_unlock_irqrestore(&cm.lock, flags);
988
989 /*
990 * The cm_id could be destroyed by the user before we exit timewait.
991 * To protect against this, we search for the cm_id after exiting
992 * timewait before notifying the user that we've exited timewait.
993 */
994 cm_id_priv->id.state = IB_CM_TIMEWAIT;
995 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
996
997 /* Check if the device started its remove_one */
998 spin_lock_irqsave(&cm.lock, flags);
999 if (!cm_dev->going_down)
1000 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
1001 msecs_to_jiffies(wait_time));
1002 spin_unlock_irqrestore(&cm.lock, flags);
1003
1004 /*
1005 * The timewait_info is converted into a work and gets freed during
1006 * cm_free_work() in cm_timewait_handler().
1007 */
1008 BUILD_BUG_ON(offsetof(struct cm_timewait_info, work) != 0);
1009 cm_id_priv->timewait_info = NULL;
1010 }
1011
cm_reset_to_idle(struct cm_id_private * cm_id_priv)1012 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
1013 {
1014 unsigned long flags;
1015
1016 lockdep_assert_held(&cm_id_priv->lock);
1017
1018 cm_id_priv->id.state = IB_CM_IDLE;
1019 if (cm_id_priv->timewait_info) {
1020 spin_lock_irqsave(&cm.lock, flags);
1021 cm_remove_remote(cm_id_priv);
1022 spin_unlock_irqrestore(&cm.lock, flags);
1023 kfree(cm_id_priv->timewait_info);
1024 cm_id_priv->timewait_info = NULL;
1025 }
1026 }
1027
cm_destroy_id(struct ib_cm_id * cm_id,int err)1028 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
1029 {
1030 struct cm_id_private *cm_id_priv;
1031 struct cm_work *work;
1032
1033 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1034 spin_lock_irq(&cm_id_priv->lock);
1035 retest:
1036 switch (cm_id->state) {
1037 case IB_CM_LISTEN:
1038 spin_lock(&cm.lock);
1039 if (--cm_id_priv->listen_sharecount > 0) {
1040 /* The id is still shared. */
1041 WARN_ON(refcount_read(&cm_id_priv->refcount) == 1);
1042 spin_unlock(&cm.lock);
1043 spin_unlock_irq(&cm_id_priv->lock);
1044 cm_deref_id(cm_id_priv);
1045 return;
1046 }
1047 cm_id->state = IB_CM_IDLE;
1048 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
1049 RB_CLEAR_NODE(&cm_id_priv->service_node);
1050 spin_unlock(&cm.lock);
1051 break;
1052 case IB_CM_SIDR_REQ_SENT:
1053 cm_id->state = IB_CM_IDLE;
1054 ib_cancel_mad(cm_id_priv->msg);
1055 break;
1056 case IB_CM_SIDR_REQ_RCVD:
1057 cm_send_sidr_rep_locked(cm_id_priv,
1058 &(struct ib_cm_sidr_rep_param){
1059 .status = IB_SIDR_REJECT });
1060 /* cm_send_sidr_rep_locked will not move to IDLE if it fails */
1061 cm_id->state = IB_CM_IDLE;
1062 break;
1063 case IB_CM_REQ_SENT:
1064 case IB_CM_MRA_REQ_RCVD:
1065 ib_cancel_mad(cm_id_priv->msg);
1066 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_TIMEOUT,
1067 &cm_id_priv->id.device->node_guid,
1068 sizeof(cm_id_priv->id.device->node_guid),
1069 NULL, 0);
1070 break;
1071 case IB_CM_REQ_RCVD:
1072 if (err == -ENOMEM) {
1073 /* Do not reject to allow future retries. */
1074 cm_reset_to_idle(cm_id_priv);
1075 } else {
1076 cm_send_rej_locked(cm_id_priv,
1077 IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
1078 NULL, 0);
1079 }
1080 break;
1081 case IB_CM_REP_SENT:
1082 case IB_CM_MRA_REP_RCVD:
1083 ib_cancel_mad(cm_id_priv->msg);
1084 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL,
1085 0, NULL, 0);
1086 goto retest;
1087 case IB_CM_MRA_REQ_SENT:
1088 case IB_CM_REP_RCVD:
1089 case IB_CM_MRA_REP_SENT:
1090 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL,
1091 0, NULL, 0);
1092 break;
1093 case IB_CM_ESTABLISHED:
1094 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
1095 cm_id->state = IB_CM_IDLE;
1096 break;
1097 }
1098 cm_send_dreq_locked(cm_id_priv, NULL, 0);
1099 goto retest;
1100 case IB_CM_DREQ_SENT:
1101 ib_cancel_mad(cm_id_priv->msg);
1102 cm_enter_timewait(cm_id_priv);
1103 goto retest;
1104 case IB_CM_DREQ_RCVD:
1105 cm_send_drep_locked(cm_id_priv, NULL, 0);
1106 WARN_ON(cm_id->state != IB_CM_TIMEWAIT);
1107 goto retest;
1108 case IB_CM_TIMEWAIT:
1109 /*
1110 * The cm_acquire_id in cm_timewait_handler will stop working
1111 * once we do xa_erase below, so just move to idle here for
1112 * consistency.
1113 */
1114 cm_id->state = IB_CM_IDLE;
1115 break;
1116 case IB_CM_IDLE:
1117 break;
1118 }
1119 WARN_ON(cm_id->state != IB_CM_IDLE);
1120
1121 spin_lock(&cm.lock);
1122 /* Required for cleanup paths related cm_req_handler() */
1123 if (cm_id_priv->timewait_info) {
1124 cm_remove_remote(cm_id_priv);
1125 kfree(cm_id_priv->timewait_info);
1126 cm_id_priv->timewait_info = NULL;
1127 }
1128
1129 WARN_ON(cm_id_priv->listen_sharecount);
1130 WARN_ON(!RB_EMPTY_NODE(&cm_id_priv->service_node));
1131 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node))
1132 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
1133 spin_unlock(&cm.lock);
1134 spin_unlock_irq(&cm_id_priv->lock);
1135
1136 xa_erase(&cm.local_id_table, cm_local_id(cm_id->local_id));
1137 cm_deref_id(cm_id_priv);
1138 wait_for_completion(&cm_id_priv->comp);
1139 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
1140 cm_free_work(work);
1141
1142 cm_destroy_av(&cm_id_priv->av);
1143 cm_destroy_av(&cm_id_priv->alt_av);
1144 kfree(cm_id_priv->private_data);
1145 kfree_rcu(cm_id_priv, rcu);
1146 }
1147
ib_destroy_cm_id(struct ib_cm_id * cm_id)1148 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
1149 {
1150 cm_destroy_id(cm_id, 0);
1151 }
1152 EXPORT_SYMBOL(ib_destroy_cm_id);
1153
cm_init_listen(struct cm_id_private * cm_id_priv,__be64 service_id)1154 static int cm_init_listen(struct cm_id_private *cm_id_priv, __be64 service_id)
1155 {
1156 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
1157 (service_id != IB_CM_ASSIGN_SERVICE_ID))
1158 return -EINVAL;
1159
1160 if (service_id == IB_CM_ASSIGN_SERVICE_ID)
1161 cm_id_priv->id.service_id = cpu_to_be64(cm.listen_service_id++);
1162 else
1163 cm_id_priv->id.service_id = service_id;
1164
1165 return 0;
1166 }
1167
1168 /**
1169 * ib_cm_listen - Initiates listening on the specified service ID for
1170 * connection and service ID resolution requests.
1171 * @cm_id: Connection identifier associated with the listen request.
1172 * @service_id: Service identifier matched against incoming connection
1173 * and service ID resolution requests. The service ID should be specified
1174 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1175 * assign a service ID to the caller.
1176 */
ib_cm_listen(struct ib_cm_id * cm_id,__be64 service_id)1177 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id)
1178 {
1179 struct cm_id_private *cm_id_priv =
1180 container_of(cm_id, struct cm_id_private, id);
1181 unsigned long flags;
1182 int ret;
1183
1184 spin_lock_irqsave(&cm_id_priv->lock, flags);
1185 if (cm_id_priv->id.state != IB_CM_IDLE) {
1186 ret = -EINVAL;
1187 goto out;
1188 }
1189
1190 ret = cm_init_listen(cm_id_priv, service_id);
1191 if (ret)
1192 goto out;
1193
1194 if (!cm_insert_listen(cm_id_priv, NULL)) {
1195 ret = -EBUSY;
1196 goto out;
1197 }
1198
1199 cm_id_priv->id.state = IB_CM_LISTEN;
1200 ret = 0;
1201
1202 out:
1203 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1204 return ret;
1205 }
1206 EXPORT_SYMBOL(ib_cm_listen);
1207
1208 /**
1209 * ib_cm_insert_listen - Create a new listening ib_cm_id and listen on
1210 * the given service ID.
1211 *
1212 * If there's an existing ID listening on that same device and service ID,
1213 * return it.
1214 *
1215 * @device: Device associated with the cm_id. All related communication will
1216 * be associated with the specified device.
1217 * @cm_handler: Callback invoked to notify the user of CM events.
1218 * @service_id: Service identifier matched against incoming connection
1219 * and service ID resolution requests. The service ID should be specified
1220 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1221 * assign a service ID to the caller.
1222 *
1223 * Callers should call ib_destroy_cm_id when done with the listener ID.
1224 */
ib_cm_insert_listen(struct ib_device * device,ib_cm_handler cm_handler,__be64 service_id)1225 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device,
1226 ib_cm_handler cm_handler,
1227 __be64 service_id)
1228 {
1229 struct cm_id_private *listen_id_priv;
1230 struct cm_id_private *cm_id_priv;
1231 int err = 0;
1232
1233 /* Create an ID in advance, since the creation may sleep */
1234 cm_id_priv = cm_alloc_id_priv(device, cm_handler, NULL);
1235 if (IS_ERR(cm_id_priv))
1236 return ERR_CAST(cm_id_priv);
1237
1238 err = cm_init_listen(cm_id_priv, service_id);
1239 if (err) {
1240 ib_destroy_cm_id(&cm_id_priv->id);
1241 return ERR_PTR(err);
1242 }
1243
1244 spin_lock_irq(&cm_id_priv->lock);
1245 listen_id_priv = cm_insert_listen(cm_id_priv, cm_handler);
1246 if (listen_id_priv != cm_id_priv) {
1247 spin_unlock_irq(&cm_id_priv->lock);
1248 ib_destroy_cm_id(&cm_id_priv->id);
1249 if (!listen_id_priv)
1250 return ERR_PTR(-EINVAL);
1251 return &listen_id_priv->id;
1252 }
1253 cm_id_priv->id.state = IB_CM_LISTEN;
1254 spin_unlock_irq(&cm_id_priv->lock);
1255
1256 /*
1257 * A listen ID does not need to be in the xarray since it does not
1258 * receive mads, is not placed in the remote_id or remote_qpn rbtree,
1259 * and does not enter timewait.
1260 */
1261
1262 return &cm_id_priv->id;
1263 }
1264 EXPORT_SYMBOL(ib_cm_insert_listen);
1265
cm_form_tid(struct cm_id_private * cm_id_priv)1266 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv)
1267 {
1268 u64 hi_tid = 0, low_tid;
1269
1270 lockdep_assert_held(&cm_id_priv->lock);
1271
1272 low_tid = (u64)cm_id_priv->id.local_id;
1273 if (!cm_id_priv->av.port)
1274 return cpu_to_be64(low_tid);
1275
1276 spin_lock(&cm_id_priv->av.port->cm_dev->mad_agent_lock);
1277 if (cm_id_priv->av.port->mad_agent)
1278 hi_tid = ((u64)cm_id_priv->av.port->mad_agent->hi_tid) << 32;
1279 spin_unlock(&cm_id_priv->av.port->cm_dev->mad_agent_lock);
1280 return cpu_to_be64(hi_tid | low_tid);
1281 }
1282
cm_format_mad_hdr(struct ib_mad_hdr * hdr,__be16 attr_id,__be64 tid)1283 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
1284 __be16 attr_id, __be64 tid)
1285 {
1286 hdr->base_version = IB_MGMT_BASE_VERSION;
1287 hdr->mgmt_class = IB_MGMT_CLASS_CM;
1288 hdr->class_version = IB_CM_CLASS_VERSION;
1289 hdr->method = IB_MGMT_METHOD_SEND;
1290 hdr->attr_id = attr_id;
1291 hdr->tid = tid;
1292 }
1293
cm_format_mad_ece_hdr(struct ib_mad_hdr * hdr,__be16 attr_id,__be64 tid,u32 attr_mod)1294 static void cm_format_mad_ece_hdr(struct ib_mad_hdr *hdr, __be16 attr_id,
1295 __be64 tid, u32 attr_mod)
1296 {
1297 cm_format_mad_hdr(hdr, attr_id, tid);
1298 hdr->attr_mod = cpu_to_be32(attr_mod);
1299 }
1300
cm_format_req(struct cm_req_msg * req_msg,struct cm_id_private * cm_id_priv,struct ib_cm_req_param * param)1301 static void cm_format_req(struct cm_req_msg *req_msg,
1302 struct cm_id_private *cm_id_priv,
1303 struct ib_cm_req_param *param)
1304 {
1305 struct sa_path_rec *pri_path = param->primary_path;
1306 struct sa_path_rec *alt_path = param->alternate_path;
1307 bool pri_ext = false;
1308 __be16 lid;
1309
1310 if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA)
1311 pri_ext = opa_is_extended_lid(pri_path->opa.dlid,
1312 pri_path->opa.slid);
1313
1314 cm_format_mad_ece_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1315 cm_form_tid(cm_id_priv), param->ece.attr_mod);
1316
1317 IBA_SET(CM_REQ_LOCAL_COMM_ID, req_msg,
1318 be32_to_cpu(cm_id_priv->id.local_id));
1319 IBA_SET(CM_REQ_SERVICE_ID, req_msg, be64_to_cpu(param->service_id));
1320 IBA_SET(CM_REQ_LOCAL_CA_GUID, req_msg,
1321 be64_to_cpu(cm_id_priv->id.device->node_guid));
1322 IBA_SET(CM_REQ_LOCAL_QPN, req_msg, param->qp_num);
1323 IBA_SET(CM_REQ_INITIATOR_DEPTH, req_msg, param->initiator_depth);
1324 IBA_SET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg,
1325 param->remote_cm_response_timeout);
1326 cm_req_set_qp_type(req_msg, param->qp_type);
1327 IBA_SET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg, param->flow_control);
1328 IBA_SET(CM_REQ_STARTING_PSN, req_msg, param->starting_psn);
1329 IBA_SET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg,
1330 param->local_cm_response_timeout);
1331 IBA_SET(CM_REQ_PARTITION_KEY, req_msg,
1332 be16_to_cpu(param->primary_path->pkey));
1333 IBA_SET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg,
1334 param->primary_path->mtu);
1335 IBA_SET(CM_REQ_MAX_CM_RETRIES, req_msg, param->max_cm_retries);
1336
1337 if (param->qp_type != IB_QPT_XRC_INI) {
1338 IBA_SET(CM_REQ_RESPONDER_RESOURCES, req_msg,
1339 param->responder_resources);
1340 IBA_SET(CM_REQ_RETRY_COUNT, req_msg, param->retry_count);
1341 IBA_SET(CM_REQ_RNR_RETRY_COUNT, req_msg,
1342 param->rnr_retry_count);
1343 IBA_SET(CM_REQ_SRQ, req_msg, param->srq);
1344 }
1345
1346 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) =
1347 pri_path->sgid;
1348 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) =
1349 pri_path->dgid;
1350 if (pri_ext) {
1351 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg)
1352 ->global.interface_id =
1353 OPA_MAKE_ID(be32_to_cpu(pri_path->opa.slid));
1354 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg)
1355 ->global.interface_id =
1356 OPA_MAKE_ID(be32_to_cpu(pri_path->opa.dlid));
1357 }
1358 if (pri_path->hop_limit <= 1) {
1359 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
1360 be16_to_cpu(pri_ext ? 0 :
1361 htons(ntohl(sa_path_get_slid(
1362 pri_path)))));
1363 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
1364 be16_to_cpu(pri_ext ? 0 :
1365 htons(ntohl(sa_path_get_dlid(
1366 pri_path)))));
1367 } else {
1368
1369 if (param->primary_path_inbound) {
1370 lid = param->primary_path_inbound->ib.dlid;
1371 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
1372 be16_to_cpu(lid));
1373 } else
1374 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
1375 be16_to_cpu(IB_LID_PERMISSIVE));
1376
1377 /* Work-around until there's a way to obtain remote LID info */
1378 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
1379 be16_to_cpu(IB_LID_PERMISSIVE));
1380 }
1381 IBA_SET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg,
1382 be32_to_cpu(pri_path->flow_label));
1383 IBA_SET(CM_REQ_PRIMARY_PACKET_RATE, req_msg, pri_path->rate);
1384 IBA_SET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg, pri_path->traffic_class);
1385 IBA_SET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg, pri_path->hop_limit);
1386 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, pri_path->sl);
1387 IBA_SET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg,
1388 (pri_path->hop_limit <= 1));
1389 IBA_SET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg,
1390 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1391 pri_path->packet_life_time));
1392
1393 if (alt_path) {
1394 bool alt_ext = false;
1395
1396 if (alt_path->rec_type == SA_PATH_REC_TYPE_OPA)
1397 alt_ext = opa_is_extended_lid(alt_path->opa.dlid,
1398 alt_path->opa.slid);
1399
1400 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg) =
1401 alt_path->sgid;
1402 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg) =
1403 alt_path->dgid;
1404 if (alt_ext) {
1405 IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID,
1406 req_msg)
1407 ->global.interface_id =
1408 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.slid));
1409 IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID,
1410 req_msg)
1411 ->global.interface_id =
1412 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.dlid));
1413 }
1414 if (alt_path->hop_limit <= 1) {
1415 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
1416 be16_to_cpu(
1417 alt_ext ? 0 :
1418 htons(ntohl(sa_path_get_slid(
1419 alt_path)))));
1420 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
1421 be16_to_cpu(
1422 alt_ext ? 0 :
1423 htons(ntohl(sa_path_get_dlid(
1424 alt_path)))));
1425 } else {
1426 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
1427 be16_to_cpu(IB_LID_PERMISSIVE));
1428 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
1429 be16_to_cpu(IB_LID_PERMISSIVE));
1430 }
1431 IBA_SET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg,
1432 be32_to_cpu(alt_path->flow_label));
1433 IBA_SET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg, alt_path->rate);
1434 IBA_SET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg,
1435 alt_path->traffic_class);
1436 IBA_SET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg,
1437 alt_path->hop_limit);
1438 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, alt_path->sl);
1439 IBA_SET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg,
1440 (alt_path->hop_limit <= 1));
1441 IBA_SET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg,
1442 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1443 alt_path->packet_life_time));
1444 }
1445 IBA_SET(CM_REQ_VENDOR_ID, req_msg, param->ece.vendor_id);
1446
1447 if (param->private_data && param->private_data_len)
1448 IBA_SET_MEM(CM_REQ_PRIVATE_DATA, req_msg, param->private_data,
1449 param->private_data_len);
1450 }
1451
cm_validate_req_param(struct ib_cm_req_param * param)1452 static int cm_validate_req_param(struct ib_cm_req_param *param)
1453 {
1454 if (!param->primary_path)
1455 return -EINVAL;
1456
1457 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
1458 param->qp_type != IB_QPT_XRC_INI)
1459 return -EINVAL;
1460
1461 if (param->private_data &&
1462 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1463 return -EINVAL;
1464
1465 if (param->alternate_path &&
1466 (param->alternate_path->pkey != param->primary_path->pkey ||
1467 param->alternate_path->mtu != param->primary_path->mtu))
1468 return -EINVAL;
1469
1470 return 0;
1471 }
1472
ib_send_cm_req(struct ib_cm_id * cm_id,struct ib_cm_req_param * param)1473 int ib_send_cm_req(struct ib_cm_id *cm_id,
1474 struct ib_cm_req_param *param)
1475 {
1476 struct cm_av av = {}, alt_av = {};
1477 struct cm_id_private *cm_id_priv;
1478 struct ib_mad_send_buf *msg;
1479 struct cm_req_msg *req_msg;
1480 unsigned long flags;
1481 int ret;
1482
1483 ret = cm_validate_req_param(param);
1484 if (ret)
1485 return ret;
1486
1487 /* Verify that we're not in timewait. */
1488 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1489 spin_lock_irqsave(&cm_id_priv->lock, flags);
1490 if (cm_id->state != IB_CM_IDLE || WARN_ON(cm_id_priv->timewait_info)) {
1491 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1492 return -EINVAL;
1493 }
1494 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1495
1496 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1497 id.local_id);
1498 if (IS_ERR(cm_id_priv->timewait_info)) {
1499 ret = PTR_ERR(cm_id_priv->timewait_info);
1500 cm_id_priv->timewait_info = NULL;
1501 return ret;
1502 }
1503
1504 ret = cm_init_av_by_path(param->primary_path,
1505 param->ppath_sgid_attr, &av);
1506 if (ret)
1507 return ret;
1508 if (param->alternate_path) {
1509 ret = cm_init_av_by_path(param->alternate_path, NULL,
1510 &alt_av);
1511 if (ret) {
1512 cm_destroy_av(&av);
1513 return ret;
1514 }
1515 }
1516 cm_id->service_id = param->service_id;
1517 cm_id_priv->timeout_ms = cm_convert_to_ms(
1518 param->primary_path->packet_life_time) * 2 +
1519 cm_convert_to_ms(
1520 param->remote_cm_response_timeout);
1521 cm_id_priv->max_cm_retries = param->max_cm_retries;
1522 cm_id_priv->initiator_depth = param->initiator_depth;
1523 cm_id_priv->responder_resources = param->responder_resources;
1524 cm_id_priv->retry_count = param->retry_count;
1525 cm_id_priv->path_mtu = param->primary_path->mtu;
1526 cm_id_priv->pkey = param->primary_path->pkey;
1527 cm_id_priv->qp_type = param->qp_type;
1528
1529 spin_lock_irqsave(&cm_id_priv->lock, flags);
1530
1531 cm_move_av_from_path(&cm_id_priv->av, &av);
1532 if (param->primary_path_outbound)
1533 cm_id_priv->av.dlid_datapath =
1534 be16_to_cpu(param->primary_path_outbound->ib.dlid);
1535
1536 if (param->alternate_path)
1537 cm_move_av_from_path(&cm_id_priv->alt_av, &alt_av);
1538
1539 msg = cm_alloc_priv_msg(cm_id_priv);
1540 if (IS_ERR(msg)) {
1541 ret = PTR_ERR(msg);
1542 goto out_unlock;
1543 }
1544
1545 req_msg = (struct cm_req_msg *)msg->mad;
1546 cm_format_req(req_msg, cm_id_priv, param);
1547 cm_id_priv->tid = req_msg->hdr.tid;
1548 msg->timeout_ms = cm_id_priv->timeout_ms;
1549 msg->context[1] = (void *)(unsigned long)IB_CM_REQ_SENT;
1550
1551 cm_id_priv->local_qpn = cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg));
1552 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg));
1553
1554 trace_icm_send_req(&cm_id_priv->id);
1555 ret = ib_post_send_mad(msg, NULL);
1556 if (ret)
1557 goto out_free;
1558 BUG_ON(cm_id->state != IB_CM_IDLE);
1559 cm_id->state = IB_CM_REQ_SENT;
1560 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1561 return 0;
1562 out_free:
1563 cm_free_priv_msg(msg);
1564 out_unlock:
1565 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1566 return ret;
1567 }
1568 EXPORT_SYMBOL(ib_send_cm_req);
1569
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)1570 static int cm_issue_rej(struct cm_port *port,
1571 struct ib_mad_recv_wc *mad_recv_wc,
1572 enum ib_cm_rej_reason reason,
1573 enum cm_msg_response msg_rejected,
1574 void *ari, u8 ari_length)
1575 {
1576 struct ib_mad_send_buf *msg = NULL;
1577 struct cm_rej_msg *rej_msg, *rcv_msg;
1578 int ret;
1579
1580 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1581 if (ret)
1582 return ret;
1583
1584 /* We just need common CM header information. Cast to any message. */
1585 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1586 rej_msg = (struct cm_rej_msg *) msg->mad;
1587
1588 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1589 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg,
1590 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg));
1591 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1592 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg));
1593 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, msg_rejected);
1594 IBA_SET(CM_REJ_REASON, rej_msg, reason);
1595
1596 if (ari && ari_length) {
1597 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length);
1598 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length);
1599 }
1600
1601 trace_icm_issue_rej(
1602 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg),
1603 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg));
1604 ret = ib_post_send_mad(msg, NULL);
1605 if (ret)
1606 cm_free_response_msg(msg);
1607
1608 return ret;
1609 }
1610
cm_req_has_alt_path(struct cm_req_msg * req_msg)1611 static bool cm_req_has_alt_path(struct cm_req_msg *req_msg)
1612 {
1613 return ((cpu_to_be16(
1614 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg))) ||
1615 (ib_is_opa_gid(IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID,
1616 req_msg))));
1617 }
1618
cm_path_set_rec_type(struct ib_device * ib_device,u32 port_num,struct sa_path_rec * path,union ib_gid * gid)1619 static void cm_path_set_rec_type(struct ib_device *ib_device, u32 port_num,
1620 struct sa_path_rec *path, union ib_gid *gid)
1621 {
1622 if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num))
1623 path->rec_type = SA_PATH_REC_TYPE_OPA;
1624 else
1625 path->rec_type = SA_PATH_REC_TYPE_IB;
1626 }
1627
cm_format_path_lid_from_req(struct cm_req_msg * req_msg,struct sa_path_rec * primary_path,struct sa_path_rec * alt_path,struct ib_wc * wc)1628 static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg,
1629 struct sa_path_rec *primary_path,
1630 struct sa_path_rec *alt_path,
1631 struct ib_wc *wc)
1632 {
1633 u32 lid;
1634
1635 if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1636 sa_path_set_dlid(primary_path, wc->slid);
1637 sa_path_set_slid(primary_path,
1638 IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID,
1639 req_msg));
1640 } else {
1641 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1642 CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg));
1643 sa_path_set_dlid(primary_path, lid);
1644
1645 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1646 CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg));
1647 sa_path_set_slid(primary_path, lid);
1648 }
1649
1650 if (!cm_req_has_alt_path(req_msg))
1651 return;
1652
1653 if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1654 sa_path_set_dlid(alt_path,
1655 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID,
1656 req_msg));
1657 sa_path_set_slid(alt_path,
1658 IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID,
1659 req_msg));
1660 } else {
1661 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1662 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg));
1663 sa_path_set_dlid(alt_path, lid);
1664
1665 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1666 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg));
1667 sa_path_set_slid(alt_path, lid);
1668 }
1669 }
1670
cm_format_paths_from_req(struct cm_req_msg * req_msg,struct sa_path_rec * primary_path,struct sa_path_rec * alt_path,struct ib_wc * wc)1671 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1672 struct sa_path_rec *primary_path,
1673 struct sa_path_rec *alt_path,
1674 struct ib_wc *wc)
1675 {
1676 primary_path->dgid =
1677 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg);
1678 primary_path->sgid =
1679 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg);
1680 primary_path->flow_label =
1681 cpu_to_be32(IBA_GET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg));
1682 primary_path->hop_limit = IBA_GET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg);
1683 primary_path->traffic_class =
1684 IBA_GET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg);
1685 primary_path->reversible = 1;
1686 primary_path->pkey =
1687 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
1688 primary_path->sl = IBA_GET(CM_REQ_PRIMARY_SL, req_msg);
1689 primary_path->mtu_selector = IB_SA_EQ;
1690 primary_path->mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
1691 primary_path->rate_selector = IB_SA_EQ;
1692 primary_path->rate = IBA_GET(CM_REQ_PRIMARY_PACKET_RATE, req_msg);
1693 primary_path->packet_life_time_selector = IB_SA_EQ;
1694 primary_path->packet_life_time =
1695 IBA_GET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg);
1696 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1697 primary_path->service_id =
1698 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
1699 if (sa_path_is_roce(primary_path))
1700 primary_path->roce.route_resolved = false;
1701
1702 if (cm_req_has_alt_path(req_msg)) {
1703 alt_path->dgid = *IBA_GET_MEM_PTR(
1704 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg);
1705 alt_path->sgid = *IBA_GET_MEM_PTR(
1706 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg);
1707 alt_path->flow_label = cpu_to_be32(
1708 IBA_GET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg));
1709 alt_path->hop_limit =
1710 IBA_GET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg);
1711 alt_path->traffic_class =
1712 IBA_GET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg);
1713 alt_path->reversible = 1;
1714 alt_path->pkey =
1715 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
1716 alt_path->sl = IBA_GET(CM_REQ_ALTERNATE_SL, req_msg);
1717 alt_path->mtu_selector = IB_SA_EQ;
1718 alt_path->mtu =
1719 IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
1720 alt_path->rate_selector = IB_SA_EQ;
1721 alt_path->rate = IBA_GET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg);
1722 alt_path->packet_life_time_selector = IB_SA_EQ;
1723 alt_path->packet_life_time =
1724 IBA_GET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg);
1725 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1726 alt_path->service_id =
1727 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
1728
1729 if (sa_path_is_roce(alt_path))
1730 alt_path->roce.route_resolved = false;
1731 }
1732 cm_format_path_lid_from_req(req_msg, primary_path, alt_path, wc);
1733 }
1734
cm_get_bth_pkey(struct cm_work * work)1735 static u16 cm_get_bth_pkey(struct cm_work *work)
1736 {
1737 struct ib_device *ib_dev = work->port->cm_dev->ib_device;
1738 u32 port_num = work->port->port_num;
1739 u16 pkey_index = work->mad_recv_wc->wc->pkey_index;
1740 u16 pkey;
1741 int ret;
1742
1743 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey);
1744 if (ret) {
1745 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %u, pkey index %u). %d\n",
1746 port_num, pkey_index, ret);
1747 return 0;
1748 }
1749
1750 return pkey;
1751 }
1752
1753 /**
1754 * cm_opa_to_ib_sgid - Convert OPA SGID to IB SGID
1755 * ULPs (such as IPoIB) do not understand OPA GIDs and will
1756 * reject them as the local_gid will not match the sgid. Therefore,
1757 * change the pathrec's SGID to an IB SGID.
1758 *
1759 * @work: Work completion
1760 * @path: Path record
1761 */
cm_opa_to_ib_sgid(struct cm_work * work,struct sa_path_rec * path)1762 static void cm_opa_to_ib_sgid(struct cm_work *work,
1763 struct sa_path_rec *path)
1764 {
1765 struct ib_device *dev = work->port->cm_dev->ib_device;
1766 u32 port_num = work->port->port_num;
1767
1768 if (rdma_cap_opa_ah(dev, port_num) &&
1769 (ib_is_opa_gid(&path->sgid))) {
1770 union ib_gid sgid;
1771
1772 if (rdma_query_gid(dev, port_num, 0, &sgid)) {
1773 dev_warn(&dev->dev,
1774 "Error updating sgid in CM request\n");
1775 return;
1776 }
1777
1778 path->sgid = sgid;
1779 }
1780 }
1781
cm_format_req_event(struct cm_work * work,struct cm_id_private * cm_id_priv,struct ib_cm_id * listen_id)1782 static void cm_format_req_event(struct cm_work *work,
1783 struct cm_id_private *cm_id_priv,
1784 struct ib_cm_id *listen_id)
1785 {
1786 struct cm_req_msg *req_msg;
1787 struct ib_cm_req_event_param *param;
1788
1789 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1790 param = &work->cm_event.param.req_rcvd;
1791 param->listen_id = listen_id;
1792 param->bth_pkey = cm_get_bth_pkey(work);
1793 param->port = cm_id_priv->av.port->port_num;
1794 param->primary_path = &work->path[0];
1795 cm_opa_to_ib_sgid(work, param->primary_path);
1796 if (cm_req_has_alt_path(req_msg)) {
1797 param->alternate_path = &work->path[1];
1798 cm_opa_to_ib_sgid(work, param->alternate_path);
1799 } else {
1800 param->alternate_path = NULL;
1801 }
1802 param->remote_ca_guid =
1803 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg));
1804 param->remote_qkey = IBA_GET(CM_REQ_LOCAL_Q_KEY, req_msg);
1805 param->remote_qpn = IBA_GET(CM_REQ_LOCAL_QPN, req_msg);
1806 param->qp_type = cm_req_get_qp_type(req_msg);
1807 param->starting_psn = IBA_GET(CM_REQ_STARTING_PSN, req_msg);
1808 param->responder_resources = IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg);
1809 param->initiator_depth = IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg);
1810 param->local_cm_response_timeout =
1811 IBA_GET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg);
1812 param->flow_control = IBA_GET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg);
1813 param->remote_cm_response_timeout =
1814 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg);
1815 param->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg);
1816 param->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg);
1817 param->srq = IBA_GET(CM_REQ_SRQ, req_msg);
1818 param->ppath_sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
1819 param->ece.vendor_id = IBA_GET(CM_REQ_VENDOR_ID, req_msg);
1820 param->ece.attr_mod = be32_to_cpu(req_msg->hdr.attr_mod);
1821
1822 work->cm_event.private_data =
1823 IBA_GET_MEM_PTR(CM_REQ_PRIVATE_DATA, req_msg);
1824 }
1825
cm_process_work(struct cm_id_private * cm_id_priv,struct cm_work * work)1826 static void cm_process_work(struct cm_id_private *cm_id_priv,
1827 struct cm_work *work)
1828 {
1829 int ret;
1830
1831 /* We will typically only have the current event to report. */
1832 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1833 cm_free_work(work);
1834
1835 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1836 spin_lock_irq(&cm_id_priv->lock);
1837 work = cm_dequeue_work(cm_id_priv);
1838 spin_unlock_irq(&cm_id_priv->lock);
1839 if (!work)
1840 return;
1841
1842 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1843 &work->cm_event);
1844 cm_free_work(work);
1845 }
1846 cm_deref_id(cm_id_priv);
1847 if (ret)
1848 cm_destroy_id(&cm_id_priv->id, ret);
1849 }
1850
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)1851 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1852 struct cm_id_private *cm_id_priv,
1853 enum cm_msg_response msg_mraed, u8 service_timeout,
1854 const void *private_data, u8 private_data_len)
1855 {
1856 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1857 IBA_SET(CM_MRA_MESSAGE_MRAED, mra_msg, msg_mraed);
1858 IBA_SET(CM_MRA_LOCAL_COMM_ID, mra_msg,
1859 be32_to_cpu(cm_id_priv->id.local_id));
1860 IBA_SET(CM_MRA_REMOTE_COMM_ID, mra_msg,
1861 be32_to_cpu(cm_id_priv->id.remote_id));
1862 IBA_SET(CM_MRA_SERVICE_TIMEOUT, mra_msg, service_timeout);
1863
1864 if (private_data && private_data_len)
1865 IBA_SET_MEM(CM_MRA_PRIVATE_DATA, mra_msg, private_data,
1866 private_data_len);
1867 }
1868
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,enum ib_cm_state state)1869 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1870 struct cm_id_private *cm_id_priv,
1871 enum ib_cm_rej_reason reason, void *ari,
1872 u8 ari_length, const void *private_data,
1873 u8 private_data_len, enum ib_cm_state state)
1874 {
1875 lockdep_assert_held(&cm_id_priv->lock);
1876
1877 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1878 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg,
1879 be32_to_cpu(cm_id_priv->id.remote_id));
1880
1881 switch (state) {
1882 case IB_CM_REQ_RCVD:
1883 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, be32_to_cpu(0));
1884 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ);
1885 break;
1886 case IB_CM_MRA_REQ_SENT:
1887 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1888 be32_to_cpu(cm_id_priv->id.local_id));
1889 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ);
1890 break;
1891 case IB_CM_REP_RCVD:
1892 case IB_CM_MRA_REP_SENT:
1893 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1894 be32_to_cpu(cm_id_priv->id.local_id));
1895 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REP);
1896 break;
1897 default:
1898 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1899 be32_to_cpu(cm_id_priv->id.local_id));
1900 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg,
1901 CM_MSG_RESPONSE_OTHER);
1902 break;
1903 }
1904
1905 IBA_SET(CM_REJ_REASON, rej_msg, reason);
1906 if (ari && ari_length) {
1907 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length);
1908 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length);
1909 }
1910
1911 if (private_data && private_data_len)
1912 IBA_SET_MEM(CM_REJ_PRIVATE_DATA, rej_msg, private_data,
1913 private_data_len);
1914 }
1915
cm_dup_req_handler(struct cm_work * work,struct cm_id_private * cm_id_priv)1916 static void cm_dup_req_handler(struct cm_work *work,
1917 struct cm_id_private *cm_id_priv)
1918 {
1919 struct ib_mad_send_buf *msg = NULL;
1920 int ret;
1921
1922 atomic_long_inc(
1923 &work->port->counters[CM_RECV_DUPLICATES][CM_REQ_COUNTER]);
1924
1925 /* Quick state check to discard duplicate REQs. */
1926 spin_lock_irq(&cm_id_priv->lock);
1927 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) {
1928 spin_unlock_irq(&cm_id_priv->lock);
1929 return;
1930 }
1931 spin_unlock_irq(&cm_id_priv->lock);
1932
1933 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1934 if (ret)
1935 return;
1936
1937 spin_lock_irq(&cm_id_priv->lock);
1938 switch (cm_id_priv->id.state) {
1939 case IB_CM_MRA_REQ_SENT:
1940 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1941 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1942 cm_id_priv->private_data,
1943 cm_id_priv->private_data_len);
1944 break;
1945 case IB_CM_TIMEWAIT:
1946 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv,
1947 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0,
1948 IB_CM_TIMEWAIT);
1949 break;
1950 default:
1951 goto unlock;
1952 }
1953 spin_unlock_irq(&cm_id_priv->lock);
1954
1955 trace_icm_send_dup_req(&cm_id_priv->id);
1956 ret = ib_post_send_mad(msg, NULL);
1957 if (ret)
1958 goto free;
1959 return;
1960
1961 unlock: spin_unlock_irq(&cm_id_priv->lock);
1962 free: cm_free_response_msg(msg);
1963 }
1964
cm_match_req(struct cm_work * work,struct cm_id_private * cm_id_priv)1965 static struct cm_id_private *cm_match_req(struct cm_work *work,
1966 struct cm_id_private *cm_id_priv)
1967 {
1968 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1969 struct cm_timewait_info *timewait_info;
1970 struct cm_req_msg *req_msg;
1971
1972 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1973
1974 /* Check for possible duplicate REQ. */
1975 spin_lock_irq(&cm.lock);
1976 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1977 if (timewait_info) {
1978 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
1979 timewait_info->work.remote_id);
1980 spin_unlock_irq(&cm.lock);
1981 if (cur_cm_id_priv) {
1982 cm_dup_req_handler(work, cur_cm_id_priv);
1983 cm_deref_id(cur_cm_id_priv);
1984 }
1985 return NULL;
1986 }
1987
1988 /* Check for stale connections. */
1989 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1990 if (timewait_info) {
1991 cm_remove_remote(cm_id_priv);
1992 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
1993 timewait_info->work.remote_id);
1994
1995 spin_unlock_irq(&cm.lock);
1996 cm_issue_rej(work->port, work->mad_recv_wc,
1997 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1998 NULL, 0);
1999 if (cur_cm_id_priv) {
2000 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0);
2001 cm_deref_id(cur_cm_id_priv);
2002 }
2003 return NULL;
2004 }
2005
2006 /* Find matching listen request. */
2007 listen_cm_id_priv = cm_find_listen(
2008 cm_id_priv->id.device,
2009 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)));
2010 if (!listen_cm_id_priv) {
2011 cm_remove_remote(cm_id_priv);
2012 spin_unlock_irq(&cm.lock);
2013 cm_issue_rej(work->port, work->mad_recv_wc,
2014 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
2015 NULL, 0);
2016 return NULL;
2017 }
2018 spin_unlock_irq(&cm.lock);
2019 return listen_cm_id_priv;
2020 }
2021
2022 /*
2023 * Work-around for inter-subnet connections. If the LIDs are permissive,
2024 * we need to override the LID/SL data in the REQ with the LID information
2025 * in the work completion.
2026 */
cm_process_routed_req(struct cm_req_msg * req_msg,struct ib_wc * wc)2027 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
2028 {
2029 if (!IBA_GET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg)) {
2030 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID,
2031 req_msg)) == IB_LID_PERMISSIVE) {
2032 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
2033 be16_to_cpu(ib_lid_be16(wc->slid)));
2034 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, wc->sl);
2035 }
2036
2037 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID,
2038 req_msg)) == IB_LID_PERMISSIVE)
2039 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
2040 wc->dlid_path_bits);
2041 }
2042
2043 if (!IBA_GET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg)) {
2044 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID,
2045 req_msg)) == IB_LID_PERMISSIVE) {
2046 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
2047 be16_to_cpu(ib_lid_be16(wc->slid)));
2048 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, wc->sl);
2049 }
2050
2051 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID,
2052 req_msg)) == IB_LID_PERMISSIVE)
2053 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
2054 wc->dlid_path_bits);
2055 }
2056 }
2057
cm_req_handler(struct cm_work * work)2058 static int cm_req_handler(struct cm_work *work)
2059 {
2060 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
2061 struct cm_req_msg *req_msg;
2062 const struct ib_global_route *grh;
2063 const struct ib_gid_attr *gid_attr;
2064 int ret;
2065
2066 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
2067
2068 cm_id_priv =
2069 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL);
2070 if (IS_ERR(cm_id_priv))
2071 return PTR_ERR(cm_id_priv);
2072
2073 cm_id_priv->id.remote_id =
2074 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_COMM_ID, req_msg));
2075 cm_id_priv->id.service_id =
2076 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
2077 cm_id_priv->tid = req_msg->hdr.tid;
2078 cm_id_priv->timeout_ms = cm_convert_to_ms(
2079 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg));
2080 cm_id_priv->max_cm_retries = IBA_GET(CM_REQ_MAX_CM_RETRIES, req_msg);
2081 cm_id_priv->remote_qpn =
2082 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg));
2083 cm_id_priv->initiator_depth =
2084 IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg);
2085 cm_id_priv->responder_resources =
2086 IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg);
2087 cm_id_priv->path_mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
2088 cm_id_priv->pkey = cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
2089 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg));
2090 cm_id_priv->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg);
2091 cm_id_priv->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg);
2092 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
2093
2094 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2095 work->mad_recv_wc->recv_buf.grh,
2096 &cm_id_priv->av);
2097 if (ret)
2098 goto destroy;
2099 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
2100 id.local_id);
2101 if (IS_ERR(cm_id_priv->timewait_info)) {
2102 ret = PTR_ERR(cm_id_priv->timewait_info);
2103 cm_id_priv->timewait_info = NULL;
2104 goto destroy;
2105 }
2106 cm_id_priv->timewait_info->work.remote_id = cm_id_priv->id.remote_id;
2107 cm_id_priv->timewait_info->remote_ca_guid =
2108 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg));
2109 cm_id_priv->timewait_info->remote_qpn = cm_id_priv->remote_qpn;
2110
2111 /*
2112 * Note that the ID pointer is not in the xarray at this point,
2113 * so this set is only visible to the local thread.
2114 */
2115 cm_id_priv->id.state = IB_CM_REQ_RCVD;
2116
2117 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
2118 if (!listen_cm_id_priv) {
2119 trace_icm_no_listener_err(&cm_id_priv->id);
2120 cm_id_priv->id.state = IB_CM_IDLE;
2121 ret = -EINVAL;
2122 goto destroy;
2123 }
2124
2125 memset(&work->path[0], 0, sizeof(work->path[0]));
2126 if (cm_req_has_alt_path(req_msg))
2127 memset(&work->path[1], 0, sizeof(work->path[1]));
2128 grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr);
2129 gid_attr = grh->sgid_attr;
2130
2131 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE) {
2132 work->path[0].rec_type =
2133 sa_conv_gid_to_pathrec_type(gid_attr->gid_type);
2134 } else {
2135 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
2136 cm_path_set_rec_type(
2137 work->port->cm_dev->ib_device, work->port->port_num,
2138 &work->path[0],
2139 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID,
2140 req_msg));
2141 }
2142 if (cm_req_has_alt_path(req_msg))
2143 work->path[1].rec_type = work->path[0].rec_type;
2144 cm_format_paths_from_req(req_msg, &work->path[0],
2145 &work->path[1], work->mad_recv_wc->wc);
2146 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE)
2147 sa_path_set_dmac(&work->path[0],
2148 cm_id_priv->av.ah_attr.roce.dmac);
2149 work->path[0].hop_limit = grh->hop_limit;
2150
2151 /* This destroy call is needed to pair with cm_init_av_for_response */
2152 cm_destroy_av(&cm_id_priv->av);
2153 ret = cm_init_av_by_path(&work->path[0], gid_attr, &cm_id_priv->av);
2154 if (ret) {
2155 int err;
2156
2157 err = rdma_query_gid(work->port->cm_dev->ib_device,
2158 work->port->port_num, 0,
2159 &work->path[0].sgid);
2160 if (err)
2161 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID,
2162 NULL, 0, NULL, 0);
2163 else
2164 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID,
2165 &work->path[0].sgid,
2166 sizeof(work->path[0].sgid),
2167 NULL, 0);
2168 goto rejected;
2169 }
2170 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_IB)
2171 cm_id_priv->av.dlid_datapath =
2172 IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg);
2173
2174 if (cm_req_has_alt_path(req_msg)) {
2175 ret = cm_init_av_by_path(&work->path[1], NULL,
2176 &cm_id_priv->alt_av);
2177 if (ret) {
2178 ib_send_cm_rej(&cm_id_priv->id,
2179 IB_CM_REJ_INVALID_ALT_GID,
2180 &work->path[0].sgid,
2181 sizeof(work->path[0].sgid), NULL, 0);
2182 goto rejected;
2183 }
2184 }
2185
2186 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
2187 cm_id_priv->id.context = listen_cm_id_priv->id.context;
2188 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
2189
2190 /* Now MAD handlers can see the new ID */
2191 spin_lock_irq(&cm_id_priv->lock);
2192 cm_finalize_id(cm_id_priv);
2193
2194 /* Refcount belongs to the event, pairs with cm_process_work() */
2195 refcount_inc(&cm_id_priv->refcount);
2196 cm_queue_work_unlock(cm_id_priv, work);
2197 /*
2198 * Since this ID was just created and was not made visible to other MAD
2199 * handlers until the cm_finalize_id() above we know that the
2200 * cm_process_work() will deliver the event and the listen_cm_id
2201 * embedded in the event can be derefed here.
2202 */
2203 cm_deref_id(listen_cm_id_priv);
2204 return 0;
2205
2206 rejected:
2207 cm_deref_id(listen_cm_id_priv);
2208 destroy:
2209 ib_destroy_cm_id(&cm_id_priv->id);
2210 return ret;
2211 }
2212
cm_format_rep(struct cm_rep_msg * rep_msg,struct cm_id_private * cm_id_priv,struct ib_cm_rep_param * param)2213 static void cm_format_rep(struct cm_rep_msg *rep_msg,
2214 struct cm_id_private *cm_id_priv,
2215 struct ib_cm_rep_param *param)
2216 {
2217 cm_format_mad_ece_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid,
2218 param->ece.attr_mod);
2219 IBA_SET(CM_REP_LOCAL_COMM_ID, rep_msg,
2220 be32_to_cpu(cm_id_priv->id.local_id));
2221 IBA_SET(CM_REP_REMOTE_COMM_ID, rep_msg,
2222 be32_to_cpu(cm_id_priv->id.remote_id));
2223 IBA_SET(CM_REP_STARTING_PSN, rep_msg, param->starting_psn);
2224 IBA_SET(CM_REP_RESPONDER_RESOURCES, rep_msg,
2225 param->responder_resources);
2226 IBA_SET(CM_REP_TARGET_ACK_DELAY, rep_msg,
2227 cm_id_priv->av.port->cm_dev->ack_delay);
2228 IBA_SET(CM_REP_FAILOVER_ACCEPTED, rep_msg, param->failover_accepted);
2229 IBA_SET(CM_REP_RNR_RETRY_COUNT, rep_msg, param->rnr_retry_count);
2230 IBA_SET(CM_REP_LOCAL_CA_GUID, rep_msg,
2231 be64_to_cpu(cm_id_priv->id.device->node_guid));
2232
2233 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
2234 IBA_SET(CM_REP_INITIATOR_DEPTH, rep_msg,
2235 param->initiator_depth);
2236 IBA_SET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg,
2237 param->flow_control);
2238 IBA_SET(CM_REP_SRQ, rep_msg, param->srq);
2239 IBA_SET(CM_REP_LOCAL_QPN, rep_msg, param->qp_num);
2240 } else {
2241 IBA_SET(CM_REP_SRQ, rep_msg, 1);
2242 IBA_SET(CM_REP_LOCAL_EE_CONTEXT_NUMBER, rep_msg, param->qp_num);
2243 }
2244
2245 IBA_SET(CM_REP_VENDOR_ID_L, rep_msg, param->ece.vendor_id);
2246 IBA_SET(CM_REP_VENDOR_ID_M, rep_msg, param->ece.vendor_id >> 8);
2247 IBA_SET(CM_REP_VENDOR_ID_H, rep_msg, param->ece.vendor_id >> 16);
2248
2249 if (param->private_data && param->private_data_len)
2250 IBA_SET_MEM(CM_REP_PRIVATE_DATA, rep_msg, param->private_data,
2251 param->private_data_len);
2252 }
2253
ib_send_cm_rep(struct ib_cm_id * cm_id,struct ib_cm_rep_param * param)2254 int ib_send_cm_rep(struct ib_cm_id *cm_id,
2255 struct ib_cm_rep_param *param)
2256 {
2257 struct cm_id_private *cm_id_priv;
2258 struct ib_mad_send_buf *msg;
2259 struct cm_rep_msg *rep_msg;
2260 unsigned long flags;
2261 int ret;
2262
2263 if (param->private_data &&
2264 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
2265 return -EINVAL;
2266
2267 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2268 spin_lock_irqsave(&cm_id_priv->lock, flags);
2269 if (cm_id->state != IB_CM_REQ_RCVD &&
2270 cm_id->state != IB_CM_MRA_REQ_SENT) {
2271 trace_icm_send_rep_err(cm_id_priv->id.local_id, cm_id->state);
2272 ret = -EINVAL;
2273 goto out;
2274 }
2275
2276 msg = cm_alloc_priv_msg(cm_id_priv);
2277 if (IS_ERR(msg)) {
2278 ret = PTR_ERR(msg);
2279 goto out;
2280 }
2281
2282 rep_msg = (struct cm_rep_msg *) msg->mad;
2283 cm_format_rep(rep_msg, cm_id_priv, param);
2284 msg->timeout_ms = cm_id_priv->timeout_ms;
2285 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
2286
2287 trace_icm_send_rep(cm_id);
2288 ret = ib_post_send_mad(msg, NULL);
2289 if (ret)
2290 goto out_free;
2291
2292 cm_id->state = IB_CM_REP_SENT;
2293 cm_id_priv->initiator_depth = param->initiator_depth;
2294 cm_id_priv->responder_resources = param->responder_resources;
2295 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg));
2296 WARN_ONCE(param->qp_num & 0xFF000000,
2297 "IBTA declares QPN to be 24 bits, but it is 0x%X\n",
2298 param->qp_num);
2299 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
2300 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2301 return 0;
2302
2303 out_free:
2304 cm_free_priv_msg(msg);
2305 out:
2306 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2307 return ret;
2308 }
2309 EXPORT_SYMBOL(ib_send_cm_rep);
2310
cm_format_rtu(struct cm_rtu_msg * rtu_msg,struct cm_id_private * cm_id_priv,const void * private_data,u8 private_data_len)2311 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
2312 struct cm_id_private *cm_id_priv,
2313 const void *private_data,
2314 u8 private_data_len)
2315 {
2316 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
2317 IBA_SET(CM_RTU_LOCAL_COMM_ID, rtu_msg,
2318 be32_to_cpu(cm_id_priv->id.local_id));
2319 IBA_SET(CM_RTU_REMOTE_COMM_ID, rtu_msg,
2320 be32_to_cpu(cm_id_priv->id.remote_id));
2321
2322 if (private_data && private_data_len)
2323 IBA_SET_MEM(CM_RTU_PRIVATE_DATA, rtu_msg, private_data,
2324 private_data_len);
2325 }
2326
ib_send_cm_rtu(struct ib_cm_id * cm_id,const void * private_data,u8 private_data_len)2327 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
2328 const void *private_data,
2329 u8 private_data_len)
2330 {
2331 struct cm_id_private *cm_id_priv;
2332 struct ib_mad_send_buf *msg;
2333 unsigned long flags;
2334 void *data;
2335 int ret;
2336
2337 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
2338 return -EINVAL;
2339
2340 data = cm_copy_private_data(private_data, private_data_len);
2341 if (IS_ERR(data))
2342 return PTR_ERR(data);
2343
2344 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2345 spin_lock_irqsave(&cm_id_priv->lock, flags);
2346 if (cm_id->state != IB_CM_REP_RCVD &&
2347 cm_id->state != IB_CM_MRA_REP_SENT) {
2348 trace_icm_send_cm_rtu_err(cm_id);
2349 ret = -EINVAL;
2350 goto error;
2351 }
2352
2353 msg = cm_alloc_msg(cm_id_priv);
2354 if (IS_ERR(msg)) {
2355 ret = PTR_ERR(msg);
2356 goto error;
2357 }
2358
2359 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2360 private_data, private_data_len);
2361
2362 trace_icm_send_rtu(cm_id);
2363 ret = ib_post_send_mad(msg, NULL);
2364 if (ret) {
2365 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2366 cm_free_msg(msg);
2367 kfree(data);
2368 return ret;
2369 }
2370
2371 cm_id->state = IB_CM_ESTABLISHED;
2372 cm_set_private_data(cm_id_priv, data, private_data_len);
2373 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2374 return 0;
2375
2376 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2377 kfree(data);
2378 return ret;
2379 }
2380 EXPORT_SYMBOL(ib_send_cm_rtu);
2381
cm_format_rep_event(struct cm_work * work,enum ib_qp_type qp_type)2382 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
2383 {
2384 struct cm_rep_msg *rep_msg;
2385 struct ib_cm_rep_event_param *param;
2386
2387 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2388 param = &work->cm_event.param.rep_rcvd;
2389 param->remote_ca_guid =
2390 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg));
2391 param->remote_qkey = IBA_GET(CM_REP_LOCAL_Q_KEY, rep_msg);
2392 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
2393 param->starting_psn = IBA_GET(CM_REP_STARTING_PSN, rep_msg);
2394 param->responder_resources = IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg);
2395 param->initiator_depth = IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg);
2396 param->target_ack_delay = IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg);
2397 param->failover_accepted = IBA_GET(CM_REP_FAILOVER_ACCEPTED, rep_msg);
2398 param->flow_control = IBA_GET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg);
2399 param->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg);
2400 param->srq = IBA_GET(CM_REP_SRQ, rep_msg);
2401 param->ece.vendor_id = IBA_GET(CM_REP_VENDOR_ID_H, rep_msg) << 16;
2402 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_M, rep_msg) << 8;
2403 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_L, rep_msg);
2404 param->ece.attr_mod = be32_to_cpu(rep_msg->hdr.attr_mod);
2405
2406 work->cm_event.private_data =
2407 IBA_GET_MEM_PTR(CM_REP_PRIVATE_DATA, rep_msg);
2408 }
2409
cm_dup_rep_handler(struct cm_work * work)2410 static void cm_dup_rep_handler(struct cm_work *work)
2411 {
2412 struct cm_id_private *cm_id_priv;
2413 struct cm_rep_msg *rep_msg;
2414 struct ib_mad_send_buf *msg = NULL;
2415 int ret;
2416
2417 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
2418 cm_id_priv = cm_acquire_id(
2419 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)),
2420 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)));
2421 if (!cm_id_priv)
2422 return;
2423
2424 atomic_long_inc(
2425 &work->port->counters[CM_RECV_DUPLICATES][CM_REP_COUNTER]);
2426 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
2427 if (ret)
2428 goto deref;
2429
2430 spin_lock_irq(&cm_id_priv->lock);
2431 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
2432 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2433 cm_id_priv->private_data,
2434 cm_id_priv->private_data_len);
2435 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
2436 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2437 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
2438 cm_id_priv->private_data,
2439 cm_id_priv->private_data_len);
2440 else
2441 goto unlock;
2442 spin_unlock_irq(&cm_id_priv->lock);
2443
2444 trace_icm_send_dup_rep(&cm_id_priv->id);
2445 ret = ib_post_send_mad(msg, NULL);
2446 if (ret)
2447 goto free;
2448 goto deref;
2449
2450 unlock: spin_unlock_irq(&cm_id_priv->lock);
2451 free: cm_free_response_msg(msg);
2452 deref: cm_deref_id(cm_id_priv);
2453 }
2454
cm_rep_handler(struct cm_work * work)2455 static int cm_rep_handler(struct cm_work *work)
2456 {
2457 struct cm_id_private *cm_id_priv;
2458 struct cm_rep_msg *rep_msg;
2459 int ret;
2460 struct cm_id_private *cur_cm_id_priv;
2461 struct cm_timewait_info *timewait_info;
2462
2463 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2464 cm_id_priv = cm_acquire_id(
2465 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 0);
2466 if (!cm_id_priv) {
2467 cm_dup_rep_handler(work);
2468 trace_icm_remote_no_priv_err(
2469 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2470 return -EINVAL;
2471 }
2472
2473 cm_format_rep_event(work, cm_id_priv->qp_type);
2474
2475 spin_lock_irq(&cm_id_priv->lock);
2476 switch (cm_id_priv->id.state) {
2477 case IB_CM_REQ_SENT:
2478 case IB_CM_MRA_REQ_RCVD:
2479 break;
2480 default:
2481 ret = -EINVAL;
2482 trace_icm_rep_unknown_err(
2483 IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg),
2484 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg),
2485 cm_id_priv->id.state);
2486 spin_unlock_irq(&cm_id_priv->lock);
2487 goto error;
2488 }
2489
2490 cm_id_priv->timewait_info->work.remote_id =
2491 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg));
2492 cm_id_priv->timewait_info->remote_ca_guid =
2493 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg));
2494 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2495
2496 spin_lock(&cm.lock);
2497 /* Check for duplicate REP. */
2498 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
2499 spin_unlock(&cm.lock);
2500 spin_unlock_irq(&cm_id_priv->lock);
2501 ret = -EINVAL;
2502 trace_icm_insert_failed_err(
2503 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2504 goto error;
2505 }
2506 /* Check for a stale connection. */
2507 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
2508 if (timewait_info) {
2509 cm_remove_remote(cm_id_priv);
2510 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2511 timewait_info->work.remote_id);
2512
2513 spin_unlock(&cm.lock);
2514 spin_unlock_irq(&cm_id_priv->lock);
2515 cm_issue_rej(work->port, work->mad_recv_wc,
2516 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
2517 NULL, 0);
2518 ret = -EINVAL;
2519 trace_icm_staleconn_err(
2520 IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg),
2521 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2522
2523 if (cur_cm_id_priv) {
2524 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0);
2525 cm_deref_id(cur_cm_id_priv);
2526 }
2527
2528 goto error;
2529 }
2530 spin_unlock(&cm.lock);
2531
2532 cm_id_priv->id.state = IB_CM_REP_RCVD;
2533 cm_id_priv->id.remote_id =
2534 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg));
2535 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2536 cm_id_priv->initiator_depth =
2537 IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg);
2538 cm_id_priv->responder_resources =
2539 IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg);
2540 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg));
2541 cm_id_priv->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg);
2542 cm_id_priv->target_ack_delay =
2543 IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg);
2544 cm_id_priv->av.timeout =
2545 cm_ack_timeout(cm_id_priv->target_ack_delay,
2546 cm_id_priv->av.timeout - 1);
2547 cm_id_priv->alt_av.timeout =
2548 cm_ack_timeout(cm_id_priv->target_ack_delay,
2549 cm_id_priv->alt_av.timeout - 1);
2550
2551 ib_cancel_mad(cm_id_priv->msg);
2552 cm_queue_work_unlock(cm_id_priv, work);
2553 return 0;
2554
2555 error:
2556 cm_deref_id(cm_id_priv);
2557 return ret;
2558 }
2559
cm_establish_handler(struct cm_work * work)2560 static int cm_establish_handler(struct cm_work *work)
2561 {
2562 struct cm_id_private *cm_id_priv;
2563
2564 /* See comment in cm_establish about lookup. */
2565 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
2566 if (!cm_id_priv)
2567 return -EINVAL;
2568
2569 spin_lock_irq(&cm_id_priv->lock);
2570 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
2571 spin_unlock_irq(&cm_id_priv->lock);
2572 goto out;
2573 }
2574
2575 ib_cancel_mad(cm_id_priv->msg);
2576 cm_queue_work_unlock(cm_id_priv, work);
2577 return 0;
2578 out:
2579 cm_deref_id(cm_id_priv);
2580 return -EINVAL;
2581 }
2582
cm_rtu_handler(struct cm_work * work)2583 static int cm_rtu_handler(struct cm_work *work)
2584 {
2585 struct cm_id_private *cm_id_priv;
2586 struct cm_rtu_msg *rtu_msg;
2587
2588 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
2589 cm_id_priv = cm_acquire_id(
2590 cpu_to_be32(IBA_GET(CM_RTU_REMOTE_COMM_ID, rtu_msg)),
2591 cpu_to_be32(IBA_GET(CM_RTU_LOCAL_COMM_ID, rtu_msg)));
2592 if (!cm_id_priv)
2593 return -EINVAL;
2594
2595 work->cm_event.private_data =
2596 IBA_GET_MEM_PTR(CM_RTU_PRIVATE_DATA, rtu_msg);
2597
2598 spin_lock_irq(&cm_id_priv->lock);
2599 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
2600 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
2601 spin_unlock_irq(&cm_id_priv->lock);
2602 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
2603 [CM_RTU_COUNTER]);
2604 goto out;
2605 }
2606 cm_id_priv->id.state = IB_CM_ESTABLISHED;
2607
2608 ib_cancel_mad(cm_id_priv->msg);
2609 cm_queue_work_unlock(cm_id_priv, work);
2610 return 0;
2611 out:
2612 cm_deref_id(cm_id_priv);
2613 return -EINVAL;
2614 }
2615
cm_format_dreq(struct cm_dreq_msg * dreq_msg,struct cm_id_private * cm_id_priv,const void * private_data,u8 private_data_len)2616 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
2617 struct cm_id_private *cm_id_priv,
2618 const void *private_data,
2619 u8 private_data_len)
2620 {
2621 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
2622 cm_form_tid(cm_id_priv));
2623 IBA_SET(CM_DREQ_LOCAL_COMM_ID, dreq_msg,
2624 be32_to_cpu(cm_id_priv->id.local_id));
2625 IBA_SET(CM_DREQ_REMOTE_COMM_ID, dreq_msg,
2626 be32_to_cpu(cm_id_priv->id.remote_id));
2627 IBA_SET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg,
2628 be32_to_cpu(cm_id_priv->remote_qpn));
2629
2630 if (private_data && private_data_len)
2631 IBA_SET_MEM(CM_DREQ_PRIVATE_DATA, dreq_msg, private_data,
2632 private_data_len);
2633 }
2634
cm_send_dreq_locked(struct cm_id_private * cm_id_priv,const void * private_data,u8 private_data_len)2635 static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv,
2636 const void *private_data, u8 private_data_len)
2637 {
2638 struct ib_mad_send_buf *msg;
2639 int ret;
2640
2641 lockdep_assert_held(&cm_id_priv->lock);
2642
2643 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
2644 return -EINVAL;
2645
2646 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
2647 trace_icm_dreq_skipped(&cm_id_priv->id);
2648 return -EINVAL;
2649 }
2650
2651 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2652 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2653 ib_cancel_mad(cm_id_priv->msg);
2654
2655 msg = cm_alloc_priv_msg(cm_id_priv);
2656 if (IS_ERR(msg)) {
2657 cm_enter_timewait(cm_id_priv);
2658 return PTR_ERR(msg);
2659 }
2660
2661 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2662 private_data, private_data_len);
2663 msg->timeout_ms = cm_id_priv->timeout_ms;
2664 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2665
2666 trace_icm_send_dreq(&cm_id_priv->id);
2667 ret = ib_post_send_mad(msg, NULL);
2668 if (ret) {
2669 cm_enter_timewait(cm_id_priv);
2670 cm_free_priv_msg(msg);
2671 return ret;
2672 }
2673
2674 cm_id_priv->id.state = IB_CM_DREQ_SENT;
2675 return 0;
2676 }
2677
ib_send_cm_dreq(struct ib_cm_id * cm_id,const void * private_data,u8 private_data_len)2678 int ib_send_cm_dreq(struct ib_cm_id *cm_id, const void *private_data,
2679 u8 private_data_len)
2680 {
2681 struct cm_id_private *cm_id_priv =
2682 container_of(cm_id, struct cm_id_private, id);
2683 unsigned long flags;
2684 int ret;
2685
2686 spin_lock_irqsave(&cm_id_priv->lock, flags);
2687 ret = cm_send_dreq_locked(cm_id_priv, private_data, private_data_len);
2688 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2689 return ret;
2690 }
2691 EXPORT_SYMBOL(ib_send_cm_dreq);
2692
cm_format_drep(struct cm_drep_msg * drep_msg,struct cm_id_private * cm_id_priv,const void * private_data,u8 private_data_len)2693 static void cm_format_drep(struct cm_drep_msg *drep_msg,
2694 struct cm_id_private *cm_id_priv,
2695 const void *private_data,
2696 u8 private_data_len)
2697 {
2698 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2699 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg,
2700 be32_to_cpu(cm_id_priv->id.local_id));
2701 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg,
2702 be32_to_cpu(cm_id_priv->id.remote_id));
2703
2704 if (private_data && private_data_len)
2705 IBA_SET_MEM(CM_DREP_PRIVATE_DATA, drep_msg, private_data,
2706 private_data_len);
2707 }
2708
cm_send_drep_locked(struct cm_id_private * cm_id_priv,void * private_data,u8 private_data_len)2709 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv,
2710 void *private_data, u8 private_data_len)
2711 {
2712 struct ib_mad_send_buf *msg;
2713 int ret;
2714
2715 lockdep_assert_held(&cm_id_priv->lock);
2716
2717 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2718 return -EINVAL;
2719
2720 if (cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2721 trace_icm_send_drep_err(&cm_id_priv->id);
2722 kfree(private_data);
2723 return -EINVAL;
2724 }
2725
2726 cm_set_private_data(cm_id_priv, private_data, private_data_len);
2727 cm_enter_timewait(cm_id_priv);
2728
2729 msg = cm_alloc_msg(cm_id_priv);
2730 if (IS_ERR(msg))
2731 return PTR_ERR(msg);
2732
2733 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2734 private_data, private_data_len);
2735
2736 trace_icm_send_drep(&cm_id_priv->id);
2737 ret = ib_post_send_mad(msg, NULL);
2738 if (ret) {
2739 cm_free_msg(msg);
2740 return ret;
2741 }
2742 return 0;
2743 }
2744
ib_send_cm_drep(struct ib_cm_id * cm_id,const void * private_data,u8 private_data_len)2745 int ib_send_cm_drep(struct ib_cm_id *cm_id, const void *private_data,
2746 u8 private_data_len)
2747 {
2748 struct cm_id_private *cm_id_priv =
2749 container_of(cm_id, struct cm_id_private, id);
2750 unsigned long flags;
2751 void *data;
2752 int ret;
2753
2754 data = cm_copy_private_data(private_data, private_data_len);
2755 if (IS_ERR(data))
2756 return PTR_ERR(data);
2757
2758 spin_lock_irqsave(&cm_id_priv->lock, flags);
2759 ret = cm_send_drep_locked(cm_id_priv, data, private_data_len);
2760 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2761 return ret;
2762 }
2763 EXPORT_SYMBOL(ib_send_cm_drep);
2764
cm_issue_drep(struct cm_port * port,struct ib_mad_recv_wc * mad_recv_wc)2765 static int cm_issue_drep(struct cm_port *port,
2766 struct ib_mad_recv_wc *mad_recv_wc)
2767 {
2768 struct ib_mad_send_buf *msg = NULL;
2769 struct cm_dreq_msg *dreq_msg;
2770 struct cm_drep_msg *drep_msg;
2771 int ret;
2772
2773 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2774 if (ret)
2775 return ret;
2776
2777 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2778 drep_msg = (struct cm_drep_msg *) msg->mad;
2779
2780 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2781 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg,
2782 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg));
2783 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg,
2784 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2785
2786 trace_icm_issue_drep(
2787 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg),
2788 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2789 ret = ib_post_send_mad(msg, NULL);
2790 if (ret)
2791 cm_free_response_msg(msg);
2792
2793 return ret;
2794 }
2795
cm_dreq_handler(struct cm_work * work)2796 static int cm_dreq_handler(struct cm_work *work)
2797 {
2798 struct cm_id_private *cm_id_priv;
2799 struct cm_dreq_msg *dreq_msg;
2800 struct ib_mad_send_buf *msg = NULL;
2801
2802 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2803 cm_id_priv = cm_acquire_id(
2804 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)),
2805 cpu_to_be32(IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg)));
2806 if (!cm_id_priv) {
2807 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
2808 [CM_DREQ_COUNTER]);
2809 cm_issue_drep(work->port, work->mad_recv_wc);
2810 trace_icm_no_priv_err(
2811 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg),
2812 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2813 return -EINVAL;
2814 }
2815
2816 work->cm_event.private_data =
2817 IBA_GET_MEM_PTR(CM_DREQ_PRIVATE_DATA, dreq_msg);
2818
2819 spin_lock_irq(&cm_id_priv->lock);
2820 if (cm_id_priv->local_qpn !=
2821 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg)))
2822 goto unlock;
2823
2824 switch (cm_id_priv->id.state) {
2825 case IB_CM_REP_SENT:
2826 case IB_CM_DREQ_SENT:
2827 case IB_CM_MRA_REP_RCVD:
2828 ib_cancel_mad(cm_id_priv->msg);
2829 break;
2830 case IB_CM_ESTABLISHED:
2831 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2832 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2833 ib_cancel_mad(cm_id_priv->msg);
2834 break;
2835 case IB_CM_TIMEWAIT:
2836 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
2837 [CM_DREQ_COUNTER]);
2838 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
2839 if (IS_ERR(msg))
2840 goto unlock;
2841
2842 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2843 cm_id_priv->private_data,
2844 cm_id_priv->private_data_len);
2845 spin_unlock_irq(&cm_id_priv->lock);
2846
2847 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
2848 ib_post_send_mad(msg, NULL))
2849 cm_free_response_msg(msg);
2850 goto deref;
2851 case IB_CM_DREQ_RCVD:
2852 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
2853 [CM_DREQ_COUNTER]);
2854 goto unlock;
2855 default:
2856 trace_icm_dreq_unknown_err(&cm_id_priv->id);
2857 goto unlock;
2858 }
2859 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2860 cm_id_priv->tid = dreq_msg->hdr.tid;
2861 cm_queue_work_unlock(cm_id_priv, work);
2862 return 0;
2863
2864 unlock: spin_unlock_irq(&cm_id_priv->lock);
2865 deref: cm_deref_id(cm_id_priv);
2866 return -EINVAL;
2867 }
2868
cm_drep_handler(struct cm_work * work)2869 static int cm_drep_handler(struct cm_work *work)
2870 {
2871 struct cm_id_private *cm_id_priv;
2872 struct cm_drep_msg *drep_msg;
2873
2874 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2875 cm_id_priv = cm_acquire_id(
2876 cpu_to_be32(IBA_GET(CM_DREP_REMOTE_COMM_ID, drep_msg)),
2877 cpu_to_be32(IBA_GET(CM_DREP_LOCAL_COMM_ID, drep_msg)));
2878 if (!cm_id_priv)
2879 return -EINVAL;
2880
2881 work->cm_event.private_data =
2882 IBA_GET_MEM_PTR(CM_DREP_PRIVATE_DATA, drep_msg);
2883
2884 spin_lock_irq(&cm_id_priv->lock);
2885 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2886 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2887 spin_unlock_irq(&cm_id_priv->lock);
2888 goto out;
2889 }
2890 cm_enter_timewait(cm_id_priv);
2891
2892 ib_cancel_mad(cm_id_priv->msg);
2893 cm_queue_work_unlock(cm_id_priv, work);
2894 return 0;
2895 out:
2896 cm_deref_id(cm_id_priv);
2897 return -EINVAL;
2898 }
2899
cm_send_rej_locked(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)2900 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv,
2901 enum ib_cm_rej_reason reason, void *ari,
2902 u8 ari_length, const void *private_data,
2903 u8 private_data_len)
2904 {
2905 enum ib_cm_state state = cm_id_priv->id.state;
2906 struct ib_mad_send_buf *msg;
2907 int ret;
2908
2909 lockdep_assert_held(&cm_id_priv->lock);
2910
2911 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2912 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2913 return -EINVAL;
2914
2915 switch (state) {
2916 case IB_CM_REQ_SENT:
2917 case IB_CM_MRA_REQ_RCVD:
2918 case IB_CM_REQ_RCVD:
2919 case IB_CM_MRA_REQ_SENT:
2920 case IB_CM_REP_RCVD:
2921 case IB_CM_MRA_REP_SENT:
2922 cm_reset_to_idle(cm_id_priv);
2923 msg = cm_alloc_msg(cm_id_priv);
2924 if (IS_ERR(msg))
2925 return PTR_ERR(msg);
2926 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason,
2927 ari, ari_length, private_data, private_data_len,
2928 state);
2929 break;
2930 case IB_CM_REP_SENT:
2931 case IB_CM_MRA_REP_RCVD:
2932 cm_enter_timewait(cm_id_priv);
2933 msg = cm_alloc_msg(cm_id_priv);
2934 if (IS_ERR(msg))
2935 return PTR_ERR(msg);
2936 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason,
2937 ari, ari_length, private_data, private_data_len,
2938 state);
2939 break;
2940 default:
2941 trace_icm_send_unknown_rej_err(&cm_id_priv->id);
2942 return -EINVAL;
2943 }
2944
2945 trace_icm_send_rej(&cm_id_priv->id, reason);
2946 ret = ib_post_send_mad(msg, NULL);
2947 if (ret) {
2948 cm_free_msg(msg);
2949 return ret;
2950 }
2951
2952 return 0;
2953 }
2954
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)2955 int ib_send_cm_rej(struct ib_cm_id *cm_id, enum ib_cm_rej_reason reason,
2956 void *ari, u8 ari_length, const void *private_data,
2957 u8 private_data_len)
2958 {
2959 struct cm_id_private *cm_id_priv =
2960 container_of(cm_id, struct cm_id_private, id);
2961 unsigned long flags;
2962 int ret;
2963
2964 spin_lock_irqsave(&cm_id_priv->lock, flags);
2965 ret = cm_send_rej_locked(cm_id_priv, reason, ari, ari_length,
2966 private_data, private_data_len);
2967 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2968 return ret;
2969 }
2970 EXPORT_SYMBOL(ib_send_cm_rej);
2971
cm_format_rej_event(struct cm_work * work)2972 static void cm_format_rej_event(struct cm_work *work)
2973 {
2974 struct cm_rej_msg *rej_msg;
2975 struct ib_cm_rej_event_param *param;
2976
2977 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2978 param = &work->cm_event.param.rej_rcvd;
2979 param->ari = IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg);
2980 param->ari_length = IBA_GET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg);
2981 param->reason = IBA_GET(CM_REJ_REASON, rej_msg);
2982 work->cm_event.private_data =
2983 IBA_GET_MEM_PTR(CM_REJ_PRIVATE_DATA, rej_msg);
2984 }
2985
cm_acquire_rejected_id(struct cm_rej_msg * rej_msg)2986 static struct cm_id_private *cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2987 {
2988 struct cm_id_private *cm_id_priv;
2989 __be32 remote_id;
2990
2991 remote_id = cpu_to_be32(IBA_GET(CM_REJ_LOCAL_COMM_ID, rej_msg));
2992
2993 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_TIMEOUT) {
2994 cm_id_priv = cm_find_remote_id(
2995 *((__be64 *)IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg)),
2996 remote_id);
2997 } else if (IBA_GET(CM_REJ_MESSAGE_REJECTED, rej_msg) ==
2998 CM_MSG_RESPONSE_REQ)
2999 cm_id_priv = cm_acquire_id(
3000 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)),
3001 0);
3002 else
3003 cm_id_priv = cm_acquire_id(
3004 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)),
3005 remote_id);
3006
3007 return cm_id_priv;
3008 }
3009
cm_rej_handler(struct cm_work * work)3010 static int cm_rej_handler(struct cm_work *work)
3011 {
3012 struct cm_id_private *cm_id_priv;
3013 struct cm_rej_msg *rej_msg;
3014
3015 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
3016 cm_id_priv = cm_acquire_rejected_id(rej_msg);
3017 if (!cm_id_priv)
3018 return -EINVAL;
3019
3020 cm_format_rej_event(work);
3021
3022 spin_lock_irq(&cm_id_priv->lock);
3023 switch (cm_id_priv->id.state) {
3024 case IB_CM_REQ_SENT:
3025 case IB_CM_MRA_REQ_RCVD:
3026 case IB_CM_REP_SENT:
3027 case IB_CM_MRA_REP_RCVD:
3028 ib_cancel_mad(cm_id_priv->msg);
3029 fallthrough;
3030 case IB_CM_REQ_RCVD:
3031 case IB_CM_MRA_REQ_SENT:
3032 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_STALE_CONN)
3033 cm_enter_timewait(cm_id_priv);
3034 else
3035 cm_reset_to_idle(cm_id_priv);
3036 break;
3037 case IB_CM_DREQ_SENT:
3038 ib_cancel_mad(cm_id_priv->msg);
3039 fallthrough;
3040 case IB_CM_REP_RCVD:
3041 case IB_CM_MRA_REP_SENT:
3042 cm_enter_timewait(cm_id_priv);
3043 break;
3044 case IB_CM_ESTABLISHED:
3045 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
3046 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
3047 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
3048 ib_cancel_mad(cm_id_priv->msg);
3049 cm_enter_timewait(cm_id_priv);
3050 break;
3051 }
3052 fallthrough;
3053 default:
3054 trace_icm_rej_unknown_err(&cm_id_priv->id);
3055 spin_unlock_irq(&cm_id_priv->lock);
3056 goto out;
3057 }
3058
3059 cm_queue_work_unlock(cm_id_priv, work);
3060 return 0;
3061 out:
3062 cm_deref_id(cm_id_priv);
3063 return -EINVAL;
3064 }
3065
ib_send_cm_mra(struct ib_cm_id * cm_id,u8 service_timeout,const void * private_data,u8 private_data_len)3066 int ib_send_cm_mra(struct ib_cm_id *cm_id,
3067 u8 service_timeout,
3068 const void *private_data,
3069 u8 private_data_len)
3070 {
3071 struct cm_id_private *cm_id_priv;
3072 struct ib_mad_send_buf *msg;
3073 enum ib_cm_state cm_state;
3074 enum ib_cm_lap_state lap_state;
3075 enum cm_msg_response msg_response;
3076 void *data;
3077 unsigned long flags;
3078 int ret;
3079
3080 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
3081 return -EINVAL;
3082
3083 data = cm_copy_private_data(private_data, private_data_len);
3084 if (IS_ERR(data))
3085 return PTR_ERR(data);
3086
3087 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3088
3089 spin_lock_irqsave(&cm_id_priv->lock, flags);
3090 switch (cm_id_priv->id.state) {
3091 case IB_CM_REQ_RCVD:
3092 cm_state = IB_CM_MRA_REQ_SENT;
3093 lap_state = cm_id->lap_state;
3094 msg_response = CM_MSG_RESPONSE_REQ;
3095 break;
3096 case IB_CM_REP_RCVD:
3097 cm_state = IB_CM_MRA_REP_SENT;
3098 lap_state = cm_id->lap_state;
3099 msg_response = CM_MSG_RESPONSE_REP;
3100 break;
3101 case IB_CM_ESTABLISHED:
3102 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
3103 cm_state = cm_id->state;
3104 lap_state = IB_CM_MRA_LAP_SENT;
3105 msg_response = CM_MSG_RESPONSE_OTHER;
3106 break;
3107 }
3108 fallthrough;
3109 default:
3110 trace_icm_send_mra_unknown_err(&cm_id_priv->id);
3111 ret = -EINVAL;
3112 goto error_unlock;
3113 }
3114
3115 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
3116 msg = cm_alloc_msg(cm_id_priv);
3117 if (IS_ERR(msg)) {
3118 ret = PTR_ERR(msg);
3119 goto error_unlock;
3120 }
3121
3122 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
3123 msg_response, service_timeout,
3124 private_data, private_data_len);
3125 trace_icm_send_mra(cm_id);
3126 ret = ib_post_send_mad(msg, NULL);
3127 if (ret)
3128 goto error_free_msg;
3129 }
3130
3131 cm_id->state = cm_state;
3132 cm_id->lap_state = lap_state;
3133 cm_id_priv->service_timeout = service_timeout;
3134 cm_set_private_data(cm_id_priv, data, private_data_len);
3135 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3136 return 0;
3137
3138 error_free_msg:
3139 cm_free_msg(msg);
3140 error_unlock:
3141 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3142 kfree(data);
3143 return ret;
3144 }
3145 EXPORT_SYMBOL(ib_send_cm_mra);
3146
cm_acquire_mraed_id(struct cm_mra_msg * mra_msg)3147 static struct cm_id_private *cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
3148 {
3149 switch (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg)) {
3150 case CM_MSG_RESPONSE_REQ:
3151 return cm_acquire_id(
3152 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)),
3153 0);
3154 case CM_MSG_RESPONSE_REP:
3155 case CM_MSG_RESPONSE_OTHER:
3156 return cm_acquire_id(
3157 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)),
3158 cpu_to_be32(IBA_GET(CM_MRA_LOCAL_COMM_ID, mra_msg)));
3159 default:
3160 return NULL;
3161 }
3162 }
3163
cm_mra_handler(struct cm_work * work)3164 static int cm_mra_handler(struct cm_work *work)
3165 {
3166 struct cm_id_private *cm_id_priv;
3167 struct cm_mra_msg *mra_msg;
3168 int timeout;
3169
3170 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
3171 cm_id_priv = cm_acquire_mraed_id(mra_msg);
3172 if (!cm_id_priv)
3173 return -EINVAL;
3174
3175 work->cm_event.private_data =
3176 IBA_GET_MEM_PTR(CM_MRA_PRIVATE_DATA, mra_msg);
3177 work->cm_event.param.mra_rcvd.service_timeout =
3178 IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg);
3179 timeout = cm_convert_to_ms(IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg)) +
3180 cm_convert_to_ms(cm_id_priv->av.timeout);
3181
3182 spin_lock_irq(&cm_id_priv->lock);
3183 switch (cm_id_priv->id.state) {
3184 case IB_CM_REQ_SENT:
3185 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3186 CM_MSG_RESPONSE_REQ ||
3187 ib_modify_mad(cm_id_priv->msg, timeout))
3188 goto out;
3189 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
3190 break;
3191 case IB_CM_REP_SENT:
3192 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3193 CM_MSG_RESPONSE_REP ||
3194 ib_modify_mad(cm_id_priv->msg, timeout))
3195 goto out;
3196 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
3197 break;
3198 case IB_CM_ESTABLISHED:
3199 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3200 CM_MSG_RESPONSE_OTHER ||
3201 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
3202 ib_modify_mad(cm_id_priv->msg, timeout)) {
3203 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
3204 atomic_long_inc(
3205 &work->port->counters[CM_RECV_DUPLICATES]
3206 [CM_MRA_COUNTER]);
3207 goto out;
3208 }
3209 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
3210 break;
3211 case IB_CM_MRA_REQ_RCVD:
3212 case IB_CM_MRA_REP_RCVD:
3213 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
3214 [CM_MRA_COUNTER]);
3215 fallthrough;
3216 default:
3217 trace_icm_mra_unknown_err(&cm_id_priv->id);
3218 goto out;
3219 }
3220
3221 cm_id_priv->msg->context[1] = (void *) (unsigned long)
3222 cm_id_priv->id.state;
3223 cm_queue_work_unlock(cm_id_priv, work);
3224 return 0;
3225 out:
3226 spin_unlock_irq(&cm_id_priv->lock);
3227 cm_deref_id(cm_id_priv);
3228 return -EINVAL;
3229 }
3230
cm_format_path_lid_from_lap(struct cm_lap_msg * lap_msg,struct sa_path_rec * path)3231 static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg,
3232 struct sa_path_rec *path)
3233 {
3234 u32 lid;
3235
3236 if (path->rec_type != SA_PATH_REC_TYPE_OPA) {
3237 sa_path_set_dlid(path, IBA_GET(CM_LAP_ALTERNATE_LOCAL_PORT_LID,
3238 lap_msg));
3239 sa_path_set_slid(path, IBA_GET(CM_LAP_ALTERNATE_REMOTE_PORT_LID,
3240 lap_msg));
3241 } else {
3242 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
3243 CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg));
3244 sa_path_set_dlid(path, lid);
3245
3246 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
3247 CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg));
3248 sa_path_set_slid(path, lid);
3249 }
3250 }
3251
cm_format_path_from_lap(struct cm_id_private * cm_id_priv,struct sa_path_rec * path,struct cm_lap_msg * lap_msg)3252 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
3253 struct sa_path_rec *path,
3254 struct cm_lap_msg *lap_msg)
3255 {
3256 path->dgid = *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg);
3257 path->sgid =
3258 *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg);
3259 path->flow_label =
3260 cpu_to_be32(IBA_GET(CM_LAP_ALTERNATE_FLOW_LABEL, lap_msg));
3261 path->hop_limit = IBA_GET(CM_LAP_ALTERNATE_HOP_LIMIT, lap_msg);
3262 path->traffic_class = IBA_GET(CM_LAP_ALTERNATE_TRAFFIC_CLASS, lap_msg);
3263 path->reversible = 1;
3264 path->pkey = cm_id_priv->pkey;
3265 path->sl = IBA_GET(CM_LAP_ALTERNATE_SL, lap_msg);
3266 path->mtu_selector = IB_SA_EQ;
3267 path->mtu = cm_id_priv->path_mtu;
3268 path->rate_selector = IB_SA_EQ;
3269 path->rate = IBA_GET(CM_LAP_ALTERNATE_PACKET_RATE, lap_msg);
3270 path->packet_life_time_selector = IB_SA_EQ;
3271 path->packet_life_time =
3272 IBA_GET(CM_LAP_ALTERNATE_LOCAL_ACK_TIMEOUT, lap_msg);
3273 path->packet_life_time -= (path->packet_life_time > 0);
3274 cm_format_path_lid_from_lap(lap_msg, path);
3275 }
3276
cm_lap_handler(struct cm_work * work)3277 static int cm_lap_handler(struct cm_work *work)
3278 {
3279 struct cm_id_private *cm_id_priv;
3280 struct cm_lap_msg *lap_msg;
3281 struct ib_cm_lap_event_param *param;
3282 struct ib_mad_send_buf *msg = NULL;
3283 struct rdma_ah_attr ah_attr;
3284 struct cm_av alt_av = {};
3285 int ret;
3286
3287 /* Currently Alternate path messages are not supported for
3288 * RoCE link layer.
3289 */
3290 if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3291 work->port->port_num))
3292 return -EINVAL;
3293
3294 /* todo: verify LAP request and send reject APR if invalid. */
3295 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
3296 cm_id_priv = cm_acquire_id(
3297 cpu_to_be32(IBA_GET(CM_LAP_REMOTE_COMM_ID, lap_msg)),
3298 cpu_to_be32(IBA_GET(CM_LAP_LOCAL_COMM_ID, lap_msg)));
3299 if (!cm_id_priv)
3300 return -EINVAL;
3301
3302 param = &work->cm_event.param.lap_rcvd;
3303 memset(&work->path[0], 0, sizeof(work->path[1]));
3304 cm_path_set_rec_type(work->port->cm_dev->ib_device,
3305 work->port->port_num, &work->path[0],
3306 IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID,
3307 lap_msg));
3308 param->alternate_path = &work->path[0];
3309 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
3310 work->cm_event.private_data =
3311 IBA_GET_MEM_PTR(CM_LAP_PRIVATE_DATA, lap_msg);
3312
3313 ret = ib_init_ah_attr_from_wc(work->port->cm_dev->ib_device,
3314 work->port->port_num,
3315 work->mad_recv_wc->wc,
3316 work->mad_recv_wc->recv_buf.grh,
3317 &ah_attr);
3318 if (ret)
3319 goto deref;
3320
3321 ret = cm_init_av_by_path(param->alternate_path, NULL, &alt_av);
3322 if (ret) {
3323 rdma_destroy_ah_attr(&ah_attr);
3324 goto deref;
3325 }
3326
3327 spin_lock_irq(&cm_id_priv->lock);
3328 cm_init_av_for_lap(work->port, work->mad_recv_wc->wc,
3329 &ah_attr, &cm_id_priv->av);
3330 cm_move_av_from_path(&cm_id_priv->alt_av, &alt_av);
3331
3332 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
3333 goto unlock;
3334
3335 switch (cm_id_priv->id.lap_state) {
3336 case IB_CM_LAP_UNINIT:
3337 case IB_CM_LAP_IDLE:
3338 break;
3339 case IB_CM_MRA_LAP_SENT:
3340 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
3341 [CM_LAP_COUNTER]);
3342 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
3343 if (IS_ERR(msg))
3344 goto unlock;
3345
3346 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
3347 CM_MSG_RESPONSE_OTHER,
3348 cm_id_priv->service_timeout,
3349 cm_id_priv->private_data,
3350 cm_id_priv->private_data_len);
3351 spin_unlock_irq(&cm_id_priv->lock);
3352
3353 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
3354 ib_post_send_mad(msg, NULL))
3355 cm_free_response_msg(msg);
3356 goto deref;
3357 case IB_CM_LAP_RCVD:
3358 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
3359 [CM_LAP_COUNTER]);
3360 goto unlock;
3361 default:
3362 goto unlock;
3363 }
3364
3365 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
3366 cm_id_priv->tid = lap_msg->hdr.tid;
3367 cm_queue_work_unlock(cm_id_priv, work);
3368 return 0;
3369
3370 unlock: spin_unlock_irq(&cm_id_priv->lock);
3371 deref: cm_deref_id(cm_id_priv);
3372 return -EINVAL;
3373 }
3374
cm_apr_handler(struct cm_work * work)3375 static int cm_apr_handler(struct cm_work *work)
3376 {
3377 struct cm_id_private *cm_id_priv;
3378 struct cm_apr_msg *apr_msg;
3379
3380 /* Currently Alternate path messages are not supported for
3381 * RoCE link layer.
3382 */
3383 if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3384 work->port->port_num))
3385 return -EINVAL;
3386
3387 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
3388 cm_id_priv = cm_acquire_id(
3389 cpu_to_be32(IBA_GET(CM_APR_REMOTE_COMM_ID, apr_msg)),
3390 cpu_to_be32(IBA_GET(CM_APR_LOCAL_COMM_ID, apr_msg)));
3391 if (!cm_id_priv)
3392 return -EINVAL; /* Unmatched reply. */
3393
3394 work->cm_event.param.apr_rcvd.ap_status =
3395 IBA_GET(CM_APR_AR_STATUS, apr_msg);
3396 work->cm_event.param.apr_rcvd.apr_info =
3397 IBA_GET_MEM_PTR(CM_APR_ADDITIONAL_INFORMATION, apr_msg);
3398 work->cm_event.param.apr_rcvd.info_len =
3399 IBA_GET(CM_APR_ADDITIONAL_INFORMATION_LENGTH, apr_msg);
3400 work->cm_event.private_data =
3401 IBA_GET_MEM_PTR(CM_APR_PRIVATE_DATA, apr_msg);
3402
3403 spin_lock_irq(&cm_id_priv->lock);
3404 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
3405 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
3406 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
3407 spin_unlock_irq(&cm_id_priv->lock);
3408 goto out;
3409 }
3410 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
3411 ib_cancel_mad(cm_id_priv->msg);
3412 cm_queue_work_unlock(cm_id_priv, work);
3413 return 0;
3414 out:
3415 cm_deref_id(cm_id_priv);
3416 return -EINVAL;
3417 }
3418
cm_timewait_handler(struct cm_work * work)3419 static int cm_timewait_handler(struct cm_work *work)
3420 {
3421 struct cm_timewait_info *timewait_info;
3422 struct cm_id_private *cm_id_priv;
3423
3424 timewait_info = container_of(work, struct cm_timewait_info, work);
3425 spin_lock_irq(&cm.lock);
3426 list_del(&timewait_info->list);
3427 spin_unlock_irq(&cm.lock);
3428
3429 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
3430 timewait_info->work.remote_id);
3431 if (!cm_id_priv)
3432 return -EINVAL;
3433
3434 spin_lock_irq(&cm_id_priv->lock);
3435 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
3436 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
3437 spin_unlock_irq(&cm_id_priv->lock);
3438 goto out;
3439 }
3440 cm_id_priv->id.state = IB_CM_IDLE;
3441 cm_queue_work_unlock(cm_id_priv, work);
3442 return 0;
3443 out:
3444 cm_deref_id(cm_id_priv);
3445 return -EINVAL;
3446 }
3447
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)3448 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
3449 struct cm_id_private *cm_id_priv,
3450 struct ib_cm_sidr_req_param *param)
3451 {
3452 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
3453 cm_form_tid(cm_id_priv));
3454 IBA_SET(CM_SIDR_REQ_REQUESTID, sidr_req_msg,
3455 be32_to_cpu(cm_id_priv->id.local_id));
3456 IBA_SET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg,
3457 be16_to_cpu(param->path->pkey));
3458 IBA_SET(CM_SIDR_REQ_SERVICEID, sidr_req_msg,
3459 be64_to_cpu(param->service_id));
3460
3461 if (param->private_data && param->private_data_len)
3462 IBA_SET_MEM(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg,
3463 param->private_data, param->private_data_len);
3464 }
3465
ib_send_cm_sidr_req(struct ib_cm_id * cm_id,struct ib_cm_sidr_req_param * param)3466 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
3467 struct ib_cm_sidr_req_param *param)
3468 {
3469 struct cm_id_private *cm_id_priv;
3470 struct ib_mad_send_buf *msg;
3471 struct cm_av av = {};
3472 unsigned long flags;
3473 int ret;
3474
3475 if (!param->path || (param->private_data &&
3476 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
3477 return -EINVAL;
3478
3479 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3480 ret = cm_init_av_by_path(param->path, param->sgid_attr, &av);
3481 if (ret)
3482 return ret;
3483
3484 spin_lock_irqsave(&cm_id_priv->lock, flags);
3485 cm_move_av_from_path(&cm_id_priv->av, &av);
3486 cm_id->service_id = param->service_id;
3487 cm_id_priv->timeout_ms = param->timeout_ms;
3488 cm_id_priv->max_cm_retries = param->max_cm_retries;
3489 if (cm_id->state != IB_CM_IDLE) {
3490 ret = -EINVAL;
3491 goto out_unlock;
3492 }
3493
3494 msg = cm_alloc_priv_msg(cm_id_priv);
3495 if (IS_ERR(msg)) {
3496 ret = PTR_ERR(msg);
3497 goto out_unlock;
3498 }
3499
3500 cm_format_sidr_req((struct cm_sidr_req_msg *)msg->mad, cm_id_priv,
3501 param);
3502 msg->timeout_ms = cm_id_priv->timeout_ms;
3503 msg->context[1] = (void *)(unsigned long)IB_CM_SIDR_REQ_SENT;
3504
3505 trace_icm_send_sidr_req(&cm_id_priv->id);
3506 ret = ib_post_send_mad(msg, NULL);
3507 if (ret)
3508 goto out_free;
3509 cm_id->state = IB_CM_SIDR_REQ_SENT;
3510 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3511 return 0;
3512 out_free:
3513 cm_free_priv_msg(msg);
3514 out_unlock:
3515 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3516 return ret;
3517 }
3518 EXPORT_SYMBOL(ib_send_cm_sidr_req);
3519
cm_format_sidr_req_event(struct cm_work * work,const struct cm_id_private * rx_cm_id,struct ib_cm_id * listen_id)3520 static void cm_format_sidr_req_event(struct cm_work *work,
3521 const struct cm_id_private *rx_cm_id,
3522 struct ib_cm_id *listen_id)
3523 {
3524 struct cm_sidr_req_msg *sidr_req_msg;
3525 struct ib_cm_sidr_req_event_param *param;
3526
3527 sidr_req_msg = (struct cm_sidr_req_msg *)
3528 work->mad_recv_wc->recv_buf.mad;
3529 param = &work->cm_event.param.sidr_req_rcvd;
3530 param->pkey = IBA_GET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg);
3531 param->listen_id = listen_id;
3532 param->service_id =
3533 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg));
3534 param->bth_pkey = cm_get_bth_pkey(work);
3535 param->port = work->port->port_num;
3536 param->sgid_attr = rx_cm_id->av.ah_attr.grh.sgid_attr;
3537 work->cm_event.private_data =
3538 IBA_GET_MEM_PTR(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg);
3539 }
3540
cm_sidr_req_handler(struct cm_work * work)3541 static int cm_sidr_req_handler(struct cm_work *work)
3542 {
3543 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
3544 struct cm_sidr_req_msg *sidr_req_msg;
3545 struct ib_wc *wc;
3546 int ret;
3547
3548 cm_id_priv =
3549 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL);
3550 if (IS_ERR(cm_id_priv))
3551 return PTR_ERR(cm_id_priv);
3552
3553 /* Record SGID/SLID and request ID for lookup. */
3554 sidr_req_msg = (struct cm_sidr_req_msg *)
3555 work->mad_recv_wc->recv_buf.mad;
3556
3557 cm_id_priv->id.remote_id =
3558 cpu_to_be32(IBA_GET(CM_SIDR_REQ_REQUESTID, sidr_req_msg));
3559 cm_id_priv->id.service_id =
3560 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg));
3561 cm_id_priv->tid = sidr_req_msg->hdr.tid;
3562
3563 wc = work->mad_recv_wc->wc;
3564 cm_id_priv->sidr_slid = wc->slid;
3565 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
3566 work->mad_recv_wc->recv_buf.grh,
3567 &cm_id_priv->av);
3568 if (ret)
3569 goto out;
3570
3571 spin_lock_irq(&cm.lock);
3572 listen_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3573 if (listen_cm_id_priv) {
3574 spin_unlock_irq(&cm.lock);
3575 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
3576 [CM_SIDR_REQ_COUNTER]);
3577 goto out; /* Duplicate message. */
3578 }
3579 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3580 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
3581 cm_id_priv->id.service_id);
3582 if (!listen_cm_id_priv) {
3583 spin_unlock_irq(&cm.lock);
3584 ib_send_cm_sidr_rep(&cm_id_priv->id,
3585 &(struct ib_cm_sidr_rep_param){
3586 .status = IB_SIDR_UNSUPPORTED });
3587 goto out; /* No match. */
3588 }
3589 spin_unlock_irq(&cm.lock);
3590
3591 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
3592 cm_id_priv->id.context = listen_cm_id_priv->id.context;
3593
3594 /*
3595 * A SIDR ID does not need to be in the xarray since it does not receive
3596 * mads, is not placed in the remote_id or remote_qpn rbtree, and does
3597 * not enter timewait.
3598 */
3599
3600 cm_format_sidr_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
3601 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
3602 cm_free_work(work);
3603 /*
3604 * A pointer to the listen_cm_id is held in the event, so this deref
3605 * must be after the event is delivered above.
3606 */
3607 cm_deref_id(listen_cm_id_priv);
3608 if (ret)
3609 cm_destroy_id(&cm_id_priv->id, ret);
3610 return 0;
3611 out:
3612 ib_destroy_cm_id(&cm_id_priv->id);
3613 return -EINVAL;
3614 }
3615
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)3616 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3617 struct cm_id_private *cm_id_priv,
3618 struct ib_cm_sidr_rep_param *param)
3619 {
3620 cm_format_mad_ece_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3621 cm_id_priv->tid, param->ece.attr_mod);
3622 IBA_SET(CM_SIDR_REP_REQUESTID, sidr_rep_msg,
3623 be32_to_cpu(cm_id_priv->id.remote_id));
3624 IBA_SET(CM_SIDR_REP_STATUS, sidr_rep_msg, param->status);
3625 IBA_SET(CM_SIDR_REP_QPN, sidr_rep_msg, param->qp_num);
3626 IBA_SET(CM_SIDR_REP_SERVICEID, sidr_rep_msg,
3627 be64_to_cpu(cm_id_priv->id.service_id));
3628 IBA_SET(CM_SIDR_REP_Q_KEY, sidr_rep_msg, param->qkey);
3629 IBA_SET(CM_SIDR_REP_VENDOR_ID_L, sidr_rep_msg,
3630 param->ece.vendor_id & 0xFF);
3631 IBA_SET(CM_SIDR_REP_VENDOR_ID_H, sidr_rep_msg,
3632 (param->ece.vendor_id >> 8) & 0xFF);
3633
3634 if (param->info && param->info_length)
3635 IBA_SET_MEM(CM_SIDR_REP_ADDITIONAL_INFORMATION, sidr_rep_msg,
3636 param->info, param->info_length);
3637
3638 if (param->private_data && param->private_data_len)
3639 IBA_SET_MEM(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg,
3640 param->private_data, param->private_data_len);
3641 }
3642
cm_send_sidr_rep_locked(struct cm_id_private * cm_id_priv,struct ib_cm_sidr_rep_param * param)3643 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv,
3644 struct ib_cm_sidr_rep_param *param)
3645 {
3646 struct ib_mad_send_buf *msg;
3647 unsigned long flags;
3648 int ret;
3649
3650 lockdep_assert_held(&cm_id_priv->lock);
3651
3652 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3653 (param->private_data &&
3654 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3655 return -EINVAL;
3656
3657 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_RCVD)
3658 return -EINVAL;
3659
3660 msg = cm_alloc_msg(cm_id_priv);
3661 if (IS_ERR(msg))
3662 return PTR_ERR(msg);
3663
3664 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3665 param);
3666 trace_icm_send_sidr_rep(&cm_id_priv->id);
3667 ret = ib_post_send_mad(msg, NULL);
3668 if (ret) {
3669 cm_free_msg(msg);
3670 return ret;
3671 }
3672 cm_id_priv->id.state = IB_CM_IDLE;
3673 spin_lock_irqsave(&cm.lock, flags);
3674 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) {
3675 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3676 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
3677 }
3678 spin_unlock_irqrestore(&cm.lock, flags);
3679 return 0;
3680 }
3681
ib_send_cm_sidr_rep(struct ib_cm_id * cm_id,struct ib_cm_sidr_rep_param * param)3682 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3683 struct ib_cm_sidr_rep_param *param)
3684 {
3685 struct cm_id_private *cm_id_priv =
3686 container_of(cm_id, struct cm_id_private, id);
3687 unsigned long flags;
3688 int ret;
3689
3690 spin_lock_irqsave(&cm_id_priv->lock, flags);
3691 ret = cm_send_sidr_rep_locked(cm_id_priv, param);
3692 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3693 return ret;
3694 }
3695 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3696
cm_format_sidr_rep_event(struct cm_work * work,const struct cm_id_private * cm_id_priv)3697 static void cm_format_sidr_rep_event(struct cm_work *work,
3698 const struct cm_id_private *cm_id_priv)
3699 {
3700 struct cm_sidr_rep_msg *sidr_rep_msg;
3701 struct ib_cm_sidr_rep_event_param *param;
3702
3703 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3704 work->mad_recv_wc->recv_buf.mad;
3705 param = &work->cm_event.param.sidr_rep_rcvd;
3706 param->status = IBA_GET(CM_SIDR_REP_STATUS, sidr_rep_msg);
3707 param->qkey = IBA_GET(CM_SIDR_REP_Q_KEY, sidr_rep_msg);
3708 param->qpn = IBA_GET(CM_SIDR_REP_QPN, sidr_rep_msg);
3709 param->info = IBA_GET_MEM_PTR(CM_SIDR_REP_ADDITIONAL_INFORMATION,
3710 sidr_rep_msg);
3711 param->info_len = IBA_GET(CM_SIDR_REP_ADDITIONAL_INFORMATION_LENGTH,
3712 sidr_rep_msg);
3713 param->sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
3714 work->cm_event.private_data =
3715 IBA_GET_MEM_PTR(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg);
3716 }
3717
cm_sidr_rep_handler(struct cm_work * work)3718 static int cm_sidr_rep_handler(struct cm_work *work)
3719 {
3720 struct cm_sidr_rep_msg *sidr_rep_msg;
3721 struct cm_id_private *cm_id_priv;
3722
3723 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3724 work->mad_recv_wc->recv_buf.mad;
3725 cm_id_priv = cm_acquire_id(
3726 cpu_to_be32(IBA_GET(CM_SIDR_REP_REQUESTID, sidr_rep_msg)), 0);
3727 if (!cm_id_priv)
3728 return -EINVAL; /* Unmatched reply. */
3729
3730 spin_lock_irq(&cm_id_priv->lock);
3731 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3732 spin_unlock_irq(&cm_id_priv->lock);
3733 goto out;
3734 }
3735 cm_id_priv->id.state = IB_CM_IDLE;
3736 ib_cancel_mad(cm_id_priv->msg);
3737 spin_unlock_irq(&cm_id_priv->lock);
3738
3739 cm_format_sidr_rep_event(work, cm_id_priv);
3740 cm_process_work(cm_id_priv, work);
3741 return 0;
3742 out:
3743 cm_deref_id(cm_id_priv);
3744 return -EINVAL;
3745 }
3746
cm_process_send_error(struct cm_id_private * cm_id_priv,struct ib_mad_send_buf * msg,enum ib_cm_state state,enum ib_wc_status wc_status)3747 static void cm_process_send_error(struct cm_id_private *cm_id_priv,
3748 struct ib_mad_send_buf *msg,
3749 enum ib_cm_state state,
3750 enum ib_wc_status wc_status)
3751 {
3752 struct ib_cm_event cm_event = {};
3753 int ret;
3754
3755 /* Discard old sends or ones without a response. */
3756 spin_lock_irq(&cm_id_priv->lock);
3757 if (msg != cm_id_priv->msg) {
3758 spin_unlock_irq(&cm_id_priv->lock);
3759 cm_free_msg(msg);
3760 return;
3761 }
3762 cm_free_priv_msg(msg);
3763
3764 if (state != cm_id_priv->id.state || wc_status == IB_WC_SUCCESS ||
3765 wc_status == IB_WC_WR_FLUSH_ERR)
3766 goto out_unlock;
3767
3768 trace_icm_mad_send_err(state, wc_status);
3769 switch (state) {
3770 case IB_CM_REQ_SENT:
3771 case IB_CM_MRA_REQ_RCVD:
3772 cm_reset_to_idle(cm_id_priv);
3773 cm_event.event = IB_CM_REQ_ERROR;
3774 break;
3775 case IB_CM_REP_SENT:
3776 case IB_CM_MRA_REP_RCVD:
3777 cm_reset_to_idle(cm_id_priv);
3778 cm_event.event = IB_CM_REP_ERROR;
3779 break;
3780 case IB_CM_DREQ_SENT:
3781 cm_enter_timewait(cm_id_priv);
3782 cm_event.event = IB_CM_DREQ_ERROR;
3783 break;
3784 case IB_CM_SIDR_REQ_SENT:
3785 cm_id_priv->id.state = IB_CM_IDLE;
3786 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3787 break;
3788 default:
3789 goto out_unlock;
3790 }
3791 spin_unlock_irq(&cm_id_priv->lock);
3792 cm_event.param.send_status = wc_status;
3793
3794 /* No other events can occur on the cm_id at this point. */
3795 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3796 if (ret)
3797 ib_destroy_cm_id(&cm_id_priv->id);
3798 return;
3799 out_unlock:
3800 spin_unlock_irq(&cm_id_priv->lock);
3801 }
3802
cm_send_handler(struct ib_mad_agent * mad_agent,struct ib_mad_send_wc * mad_send_wc)3803 static void cm_send_handler(struct ib_mad_agent *mad_agent,
3804 struct ib_mad_send_wc *mad_send_wc)
3805 {
3806 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3807 struct cm_id_private *cm_id_priv = msg->context[0];
3808 enum ib_cm_state state =
3809 (enum ib_cm_state)(unsigned long)msg->context[1];
3810 struct cm_port *port;
3811 u16 attr_index;
3812
3813 port = mad_agent->context;
3814 attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3815 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3816
3817 /*
3818 * If the send was in response to a received message (context[0] is not
3819 * set to a cm_id), and is not a REJ, then it is a send that was
3820 * manually retried.
3821 */
3822 if (!cm_id_priv && (attr_index != CM_REJ_COUNTER))
3823 msg->retries = 1;
3824
3825 atomic_long_add(1 + msg->retries, &port->counters[CM_XMIT][attr_index]);
3826 if (msg->retries)
3827 atomic_long_add(msg->retries,
3828 &port->counters[CM_XMIT_RETRIES][attr_index]);
3829
3830 if (cm_id_priv)
3831 cm_process_send_error(cm_id_priv, msg, state,
3832 mad_send_wc->status);
3833 else
3834 cm_free_response_msg(msg);
3835 }
3836
cm_work_handler(struct work_struct * _work)3837 static void cm_work_handler(struct work_struct *_work)
3838 {
3839 struct cm_work *work = container_of(_work, struct cm_work, work.work);
3840 int ret;
3841
3842 switch (work->cm_event.event) {
3843 case IB_CM_REQ_RECEIVED:
3844 ret = cm_req_handler(work);
3845 break;
3846 case IB_CM_MRA_RECEIVED:
3847 ret = cm_mra_handler(work);
3848 break;
3849 case IB_CM_REJ_RECEIVED:
3850 ret = cm_rej_handler(work);
3851 break;
3852 case IB_CM_REP_RECEIVED:
3853 ret = cm_rep_handler(work);
3854 break;
3855 case IB_CM_RTU_RECEIVED:
3856 ret = cm_rtu_handler(work);
3857 break;
3858 case IB_CM_USER_ESTABLISHED:
3859 ret = cm_establish_handler(work);
3860 break;
3861 case IB_CM_DREQ_RECEIVED:
3862 ret = cm_dreq_handler(work);
3863 break;
3864 case IB_CM_DREP_RECEIVED:
3865 ret = cm_drep_handler(work);
3866 break;
3867 case IB_CM_SIDR_REQ_RECEIVED:
3868 ret = cm_sidr_req_handler(work);
3869 break;
3870 case IB_CM_SIDR_REP_RECEIVED:
3871 ret = cm_sidr_rep_handler(work);
3872 break;
3873 case IB_CM_LAP_RECEIVED:
3874 ret = cm_lap_handler(work);
3875 break;
3876 case IB_CM_APR_RECEIVED:
3877 ret = cm_apr_handler(work);
3878 break;
3879 case IB_CM_TIMEWAIT_EXIT:
3880 ret = cm_timewait_handler(work);
3881 break;
3882 default:
3883 trace_icm_handler_err(work->cm_event.event);
3884 ret = -EINVAL;
3885 break;
3886 }
3887 if (ret)
3888 cm_free_work(work);
3889 }
3890
cm_establish(struct ib_cm_id * cm_id)3891 static int cm_establish(struct ib_cm_id *cm_id)
3892 {
3893 struct cm_id_private *cm_id_priv;
3894 struct cm_work *work;
3895 unsigned long flags;
3896 int ret = 0;
3897 struct cm_device *cm_dev;
3898
3899 cm_dev = ib_get_client_data(cm_id->device, &cm_client);
3900 if (!cm_dev)
3901 return -ENODEV;
3902
3903 work = kmalloc(sizeof *work, GFP_ATOMIC);
3904 if (!work)
3905 return -ENOMEM;
3906
3907 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3908 spin_lock_irqsave(&cm_id_priv->lock, flags);
3909 switch (cm_id->state) {
3910 case IB_CM_REP_SENT:
3911 case IB_CM_MRA_REP_RCVD:
3912 cm_id->state = IB_CM_ESTABLISHED;
3913 break;
3914 case IB_CM_ESTABLISHED:
3915 ret = -EISCONN;
3916 break;
3917 default:
3918 trace_icm_establish_err(cm_id);
3919 ret = -EINVAL;
3920 break;
3921 }
3922 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3923
3924 if (ret) {
3925 kfree(work);
3926 goto out;
3927 }
3928
3929 /*
3930 * The CM worker thread may try to destroy the cm_id before it
3931 * can execute this work item. To prevent potential deadlock,
3932 * we need to find the cm_id once we're in the context of the
3933 * worker thread, rather than holding a reference on it.
3934 */
3935 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3936 work->local_id = cm_id->local_id;
3937 work->remote_id = cm_id->remote_id;
3938 work->mad_recv_wc = NULL;
3939 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3940
3941 /* Check if the device started its remove_one */
3942 spin_lock_irqsave(&cm.lock, flags);
3943 if (!cm_dev->going_down) {
3944 queue_delayed_work(cm.wq, &work->work, 0);
3945 } else {
3946 kfree(work);
3947 ret = -ENODEV;
3948 }
3949 spin_unlock_irqrestore(&cm.lock, flags);
3950
3951 out:
3952 return ret;
3953 }
3954
cm_migrate(struct ib_cm_id * cm_id)3955 static int cm_migrate(struct ib_cm_id *cm_id)
3956 {
3957 struct cm_id_private *cm_id_priv;
3958 unsigned long flags;
3959 int ret = 0;
3960
3961 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3962 spin_lock_irqsave(&cm_id_priv->lock, flags);
3963 if (cm_id->state == IB_CM_ESTABLISHED &&
3964 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3965 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3966 cm_id->lap_state = IB_CM_LAP_IDLE;
3967 cm_id_priv->av = cm_id_priv->alt_av;
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->counters[CM_RECV][attr_id - CM_ATTR_ID_OFFSET]);
4050
4051 work = kmalloc(struct_size(work, path, paths), GFP_KERNEL);
4052 if (!work) {
4053 ib_free_recv_mad(mad_recv_wc);
4054 return;
4055 }
4056
4057 INIT_DELAYED_WORK(&work->work, cm_work_handler);
4058 work->cm_event.event = event;
4059 work->mad_recv_wc = mad_recv_wc;
4060 work->port = port;
4061
4062 /* Check if the device started its remove_one */
4063 spin_lock_irq(&cm.lock);
4064 if (!port->cm_dev->going_down)
4065 queue_delayed_work(cm.wq, &work->work, 0);
4066 else
4067 going_down = 1;
4068 spin_unlock_irq(&cm.lock);
4069
4070 if (going_down) {
4071 kfree(work);
4072 ib_free_recv_mad(mad_recv_wc);
4073 }
4074 }
4075
cm_init_qp_init_attr(struct cm_id_private * cm_id_priv,struct ib_qp_attr * qp_attr,int * qp_attr_mask)4076 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
4077 struct ib_qp_attr *qp_attr,
4078 int *qp_attr_mask)
4079 {
4080 unsigned long flags;
4081 int ret;
4082
4083 spin_lock_irqsave(&cm_id_priv->lock, flags);
4084 switch (cm_id_priv->id.state) {
4085 case IB_CM_REQ_SENT:
4086 case IB_CM_MRA_REQ_RCVD:
4087 case IB_CM_REQ_RCVD:
4088 case IB_CM_MRA_REQ_SENT:
4089 case IB_CM_REP_RCVD:
4090 case IB_CM_MRA_REP_SENT:
4091 case IB_CM_REP_SENT:
4092 case IB_CM_MRA_REP_RCVD:
4093 case IB_CM_ESTABLISHED:
4094 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
4095 IB_QP_PKEY_INDEX | IB_QP_PORT;
4096 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
4097 if (cm_id_priv->responder_resources)
4098 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
4099 IB_ACCESS_REMOTE_ATOMIC;
4100 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
4101 if (cm_id_priv->av.port)
4102 qp_attr->port_num = cm_id_priv->av.port->port_num;
4103 ret = 0;
4104 break;
4105 default:
4106 trace_icm_qp_init_err(&cm_id_priv->id);
4107 ret = -EINVAL;
4108 break;
4109 }
4110 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4111 return ret;
4112 }
4113
cm_init_qp_rtr_attr(struct cm_id_private * cm_id_priv,struct ib_qp_attr * qp_attr,int * qp_attr_mask)4114 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
4115 struct ib_qp_attr *qp_attr,
4116 int *qp_attr_mask)
4117 {
4118 unsigned long flags;
4119 int ret;
4120
4121 spin_lock_irqsave(&cm_id_priv->lock, flags);
4122 switch (cm_id_priv->id.state) {
4123 case IB_CM_REQ_RCVD:
4124 case IB_CM_MRA_REQ_SENT:
4125 case IB_CM_REP_RCVD:
4126 case IB_CM_MRA_REP_SENT:
4127 case IB_CM_REP_SENT:
4128 case IB_CM_MRA_REP_RCVD:
4129 case IB_CM_ESTABLISHED:
4130 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
4131 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
4132 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
4133 if ((qp_attr->ah_attr.type == RDMA_AH_ATTR_TYPE_IB) &&
4134 cm_id_priv->av.dlid_datapath &&
4135 (cm_id_priv->av.dlid_datapath != 0xffff))
4136 qp_attr->ah_attr.ib.dlid = cm_id_priv->av.dlid_datapath;
4137 qp_attr->path_mtu = cm_id_priv->path_mtu;
4138 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
4139 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
4140 if (cm_id_priv->qp_type == IB_QPT_RC ||
4141 cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
4142 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
4143 IB_QP_MIN_RNR_TIMER;
4144 qp_attr->max_dest_rd_atomic =
4145 cm_id_priv->responder_resources;
4146 qp_attr->min_rnr_timer = 0;
4147 }
4148 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr) &&
4149 cm_id_priv->alt_av.port) {
4150 *qp_attr_mask |= IB_QP_ALT_PATH;
4151 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
4152 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4153 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4154 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4155 }
4156 ret = 0;
4157 break;
4158 default:
4159 trace_icm_qp_rtr_err(&cm_id_priv->id);
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 fallthrough;
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 if (cm_id_priv->alt_av.port)
4211 qp_attr->alt_port_num =
4212 cm_id_priv->alt_av.port->port_num;
4213 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4214 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4215 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4216 qp_attr->path_mig_state = IB_MIG_REARM;
4217 }
4218 ret = 0;
4219 break;
4220 default:
4221 trace_icm_qp_rts_err(&cm_id_priv->id);
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 ib_device * ibdev,u32 port_num,struct ib_port_attribute * attr,char * buf)4255 static ssize_t cm_show_counter(struct ib_device *ibdev, u32 port_num,
4256 struct ib_port_attribute *attr, char *buf)
4257 {
4258 struct cm_counter_attribute *cm_attr =
4259 container_of(attr, struct cm_counter_attribute, attr);
4260 struct cm_device *cm_dev = ib_get_client_data(ibdev, &cm_client);
4261
4262 if (WARN_ON(!cm_dev))
4263 return -EINVAL;
4264
4265 return sysfs_emit(
4266 buf, "%ld\n",
4267 atomic_long_read(
4268 &cm_dev->port[port_num - 1]
4269 ->counters[cm_attr->group][cm_attr->index]));
4270 }
4271
4272 #define CM_COUNTER_ATTR(_name, _group, _index) \
4273 { \
4274 .attr = __ATTR(_name, 0444, cm_show_counter, NULL), \
4275 .group = _group, .index = _index \
4276 }
4277
4278 #define CM_COUNTER_GROUP(_group, _name) \
4279 static struct cm_counter_attribute cm_counter_attr_##_group[] = { \
4280 CM_COUNTER_ATTR(req, _group, CM_REQ_COUNTER), \
4281 CM_COUNTER_ATTR(mra, _group, CM_MRA_COUNTER), \
4282 CM_COUNTER_ATTR(rej, _group, CM_REJ_COUNTER), \
4283 CM_COUNTER_ATTR(rep, _group, CM_REP_COUNTER), \
4284 CM_COUNTER_ATTR(rtu, _group, CM_RTU_COUNTER), \
4285 CM_COUNTER_ATTR(dreq, _group, CM_DREQ_COUNTER), \
4286 CM_COUNTER_ATTR(drep, _group, CM_DREP_COUNTER), \
4287 CM_COUNTER_ATTR(sidr_req, _group, CM_SIDR_REQ_COUNTER), \
4288 CM_COUNTER_ATTR(sidr_rep, _group, CM_SIDR_REP_COUNTER), \
4289 CM_COUNTER_ATTR(lap, _group, CM_LAP_COUNTER), \
4290 CM_COUNTER_ATTR(apr, _group, CM_APR_COUNTER), \
4291 }; \
4292 static struct attribute *cm_counter_attrs_##_group[] = { \
4293 &cm_counter_attr_##_group[0].attr.attr, \
4294 &cm_counter_attr_##_group[1].attr.attr, \
4295 &cm_counter_attr_##_group[2].attr.attr, \
4296 &cm_counter_attr_##_group[3].attr.attr, \
4297 &cm_counter_attr_##_group[4].attr.attr, \
4298 &cm_counter_attr_##_group[5].attr.attr, \
4299 &cm_counter_attr_##_group[6].attr.attr, \
4300 &cm_counter_attr_##_group[7].attr.attr, \
4301 &cm_counter_attr_##_group[8].attr.attr, \
4302 &cm_counter_attr_##_group[9].attr.attr, \
4303 &cm_counter_attr_##_group[10].attr.attr, \
4304 NULL, \
4305 }; \
4306 static const struct attribute_group cm_counter_group_##_group = { \
4307 .name = _name, \
4308 .attrs = cm_counter_attrs_##_group, \
4309 };
4310
4311 CM_COUNTER_GROUP(CM_XMIT, "cm_tx_msgs")
4312 CM_COUNTER_GROUP(CM_XMIT_RETRIES, "cm_tx_retries")
4313 CM_COUNTER_GROUP(CM_RECV, "cm_rx_msgs")
4314 CM_COUNTER_GROUP(CM_RECV_DUPLICATES, "cm_rx_duplicates")
4315
4316 static const struct attribute_group *cm_counter_groups[] = {
4317 &cm_counter_group_CM_XMIT,
4318 &cm_counter_group_CM_XMIT_RETRIES,
4319 &cm_counter_group_CM_RECV,
4320 &cm_counter_group_CM_RECV_DUPLICATES,
4321 NULL,
4322 };
4323
cm_add_one(struct ib_device * ib_device)4324 static int cm_add_one(struct ib_device *ib_device)
4325 {
4326 struct cm_device *cm_dev;
4327 struct cm_port *port;
4328 struct ib_mad_reg_req reg_req = {
4329 .mgmt_class = IB_MGMT_CLASS_CM,
4330 .mgmt_class_version = IB_CM_CLASS_VERSION,
4331 };
4332 struct ib_port_modify port_modify = {
4333 .set_port_cap_mask = IB_PORT_CM_SUP
4334 };
4335 unsigned long flags;
4336 int ret;
4337 int count = 0;
4338 u32 i;
4339
4340 cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt),
4341 GFP_KERNEL);
4342 if (!cm_dev)
4343 return -ENOMEM;
4344
4345 kref_init(&cm_dev->kref);
4346 spin_lock_init(&cm_dev->mad_agent_lock);
4347 cm_dev->ib_device = ib_device;
4348 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay;
4349 cm_dev->going_down = 0;
4350
4351 ib_set_client_data(ib_device, &cm_client, cm_dev);
4352
4353 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
4354 rdma_for_each_port (ib_device, i) {
4355 if (!rdma_cap_ib_cm(ib_device, i))
4356 continue;
4357
4358 port = kzalloc(sizeof *port, GFP_KERNEL);
4359 if (!port) {
4360 ret = -ENOMEM;
4361 goto error1;
4362 }
4363
4364 cm_dev->port[i-1] = port;
4365 port->cm_dev = cm_dev;
4366 port->port_num = i;
4367
4368 ret = ib_port_register_client_groups(ib_device, i,
4369 cm_counter_groups);
4370 if (ret)
4371 goto error1;
4372
4373 port->mad_agent = ib_register_mad_agent(ib_device, i,
4374 IB_QPT_GSI,
4375 ®_req,
4376 0,
4377 cm_send_handler,
4378 cm_recv_handler,
4379 port,
4380 0);
4381 if (IS_ERR(port->mad_agent)) {
4382 ret = PTR_ERR(port->mad_agent);
4383 goto error2;
4384 }
4385
4386 ret = ib_modify_port(ib_device, i, 0, &port_modify);
4387 if (ret)
4388 goto error3;
4389
4390 count++;
4391 }
4392
4393 if (!count) {
4394 ret = -EOPNOTSUPP;
4395 goto free;
4396 }
4397
4398 write_lock_irqsave(&cm.device_lock, flags);
4399 list_add_tail(&cm_dev->list, &cm.device_list);
4400 write_unlock_irqrestore(&cm.device_lock, flags);
4401 return 0;
4402
4403 error3:
4404 ib_unregister_mad_agent(port->mad_agent);
4405 error2:
4406 ib_port_unregister_client_groups(ib_device, i, cm_counter_groups);
4407 error1:
4408 port_modify.set_port_cap_mask = 0;
4409 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
4410 while (--i) {
4411 if (!rdma_cap_ib_cm(ib_device, i))
4412 continue;
4413
4414 port = cm_dev->port[i-1];
4415 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4416 ib_unregister_mad_agent(port->mad_agent);
4417 ib_port_unregister_client_groups(ib_device, i,
4418 cm_counter_groups);
4419 }
4420 free:
4421 cm_device_put(cm_dev);
4422 return ret;
4423 }
4424
cm_remove_one(struct ib_device * ib_device,void * client_data)4425 static void cm_remove_one(struct ib_device *ib_device, void *client_data)
4426 {
4427 struct cm_device *cm_dev = client_data;
4428 struct cm_port *port;
4429 struct ib_port_modify port_modify = {
4430 .clr_port_cap_mask = IB_PORT_CM_SUP
4431 };
4432 unsigned long flags;
4433 u32 i;
4434
4435 write_lock_irqsave(&cm.device_lock, flags);
4436 list_del(&cm_dev->list);
4437 write_unlock_irqrestore(&cm.device_lock, flags);
4438
4439 spin_lock_irq(&cm.lock);
4440 cm_dev->going_down = 1;
4441 spin_unlock_irq(&cm.lock);
4442
4443 rdma_for_each_port (ib_device, i) {
4444 struct ib_mad_agent *mad_agent;
4445
4446 if (!rdma_cap_ib_cm(ib_device, i))
4447 continue;
4448
4449 port = cm_dev->port[i-1];
4450 mad_agent = port->mad_agent;
4451 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4452 /*
4453 * We flush the queue here after the going_down set, this
4454 * verify that no new works will be queued in the recv handler,
4455 * after that we can call the unregister_mad_agent
4456 */
4457 flush_workqueue(cm.wq);
4458 /*
4459 * The above ensures no call paths from the work are running,
4460 * the remaining paths all take the mad_agent_lock.
4461 */
4462 spin_lock(&cm_dev->mad_agent_lock);
4463 port->mad_agent = NULL;
4464 spin_unlock(&cm_dev->mad_agent_lock);
4465 ib_unregister_mad_agent(mad_agent);
4466 ib_port_unregister_client_groups(ib_device, i,
4467 cm_counter_groups);
4468 }
4469
4470 cm_device_put(cm_dev);
4471 }
4472
ib_cm_init(void)4473 static int __init ib_cm_init(void)
4474 {
4475 int ret;
4476
4477 INIT_LIST_HEAD(&cm.device_list);
4478 rwlock_init(&cm.device_lock);
4479 spin_lock_init(&cm.lock);
4480 cm.listen_service_table = RB_ROOT;
4481 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
4482 cm.remote_id_table = RB_ROOT;
4483 cm.remote_qp_table = RB_ROOT;
4484 cm.remote_sidr_table = RB_ROOT;
4485 xa_init_flags(&cm.local_id_table, XA_FLAGS_ALLOC);
4486 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
4487 INIT_LIST_HEAD(&cm.timewait_list);
4488
4489 cm.wq = alloc_workqueue("ib_cm", 0, 1);
4490 if (!cm.wq) {
4491 ret = -ENOMEM;
4492 goto error2;
4493 }
4494
4495 ret = ib_register_client(&cm_client);
4496 if (ret)
4497 goto error3;
4498
4499 return 0;
4500 error3:
4501 destroy_workqueue(cm.wq);
4502 error2:
4503 return ret;
4504 }
4505
ib_cm_cleanup(void)4506 static void __exit ib_cm_cleanup(void)
4507 {
4508 struct cm_timewait_info *timewait_info, *tmp;
4509
4510 spin_lock_irq(&cm.lock);
4511 list_for_each_entry(timewait_info, &cm.timewait_list, list)
4512 cancel_delayed_work(&timewait_info->work.work);
4513 spin_unlock_irq(&cm.lock);
4514
4515 ib_unregister_client(&cm_client);
4516 destroy_workqueue(cm.wq);
4517
4518 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
4519 list_del(&timewait_info->list);
4520 kfree(timewait_info);
4521 }
4522
4523 WARN_ON(!xa_empty(&cm.local_id_table));
4524 }
4525
4526 module_init(ib_cm_init);
4527 module_exit(ib_cm_cleanup);
4528