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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / infiniband / core / cm.c
blob98165589c8ab69fa8c86ec70b518e9efeece26d8
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 "cm_msgs.h"
29 #include "core_priv.h"
30 #include "cm_trace.h"
31
32 MODULE_AUTHOR("Sean Hefty");
33 MODULE_DESCRIPTION("InfiniBand CM");
34 MODULE_LICENSE("Dual BSD/GPL");
35
36 static const char * const ibcm_rej_reason_strs[] = {
37 [IB_CM_REJ_NO_QP] = "no QP",
38 [IB_CM_REJ_NO_EEC] = "no EEC",
39 [IB_CM_REJ_NO_RESOURCES] = "no resources",
40 [IB_CM_REJ_TIMEOUT] = "timeout",
41 [IB_CM_REJ_UNSUPPORTED] = "unsupported",
42 [IB_CM_REJ_INVALID_COMM_ID] = "invalid comm ID",
43 [IB_CM_REJ_INVALID_COMM_INSTANCE] = "invalid comm instance",
44 [IB_CM_REJ_INVALID_SERVICE_ID] = "invalid service ID",
45 [IB_CM_REJ_INVALID_TRANSPORT_TYPE] = "invalid transport type",
46 [IB_CM_REJ_STALE_CONN] = "stale conn",
47 [IB_CM_REJ_RDC_NOT_EXIST] = "RDC not exist",
48 [IB_CM_REJ_INVALID_GID] = "invalid GID",
49 [IB_CM_REJ_INVALID_LID] = "invalid LID",
50 [IB_CM_REJ_INVALID_SL] = "invalid SL",
51 [IB_CM_REJ_INVALID_TRAFFIC_CLASS] = "invalid traffic class",
52 [IB_CM_REJ_INVALID_HOP_LIMIT] = "invalid hop limit",
53 [IB_CM_REJ_INVALID_PACKET_RATE] = "invalid packet rate",
54 [IB_CM_REJ_INVALID_ALT_GID] = "invalid alt GID",
55 [IB_CM_REJ_INVALID_ALT_LID] = "invalid alt LID",
56 [IB_CM_REJ_INVALID_ALT_SL] = "invalid alt SL",
57 [IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS] = "invalid alt traffic class",
58 [IB_CM_REJ_INVALID_ALT_HOP_LIMIT] = "invalid alt hop limit",
59 [IB_CM_REJ_INVALID_ALT_PACKET_RATE] = "invalid alt packet rate",
60 [IB_CM_REJ_PORT_CM_REDIRECT] = "port CM redirect",
61 [IB_CM_REJ_PORT_REDIRECT] = "port redirect",
62 [IB_CM_REJ_INVALID_MTU] = "invalid MTU",
63 [IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES] = "insufficient resp resources",
64 [IB_CM_REJ_CONSUMER_DEFINED] = "consumer defined",
65 [IB_CM_REJ_INVALID_RNR_RETRY] = "invalid RNR retry",
66 [IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID] = "duplicate local comm ID",
67 [IB_CM_REJ_INVALID_CLASS_VERSION] = "invalid class version",
68 [IB_CM_REJ_INVALID_FLOW_LABEL] = "invalid flow label",
69 [IB_CM_REJ_INVALID_ALT_FLOW_LABEL] = "invalid alt flow label",
70 [IB_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED] =
71 "vendor option is not supported",
72 };
73
74 const char *__attribute_const__ ibcm_reject_msg(int reason)
75 {
76 size_t index = reason;
77
78 if (index < ARRAY_SIZE(ibcm_rej_reason_strs) &&
79 ibcm_rej_reason_strs[index])
80 return ibcm_rej_reason_strs[index];
81 else
82 return "unrecognized reason";
83 }
84 EXPORT_SYMBOL(ibcm_reject_msg);
85
86 struct cm_id_private;
87 struct cm_work;
88 static int cm_add_one(struct ib_device *device);
89 static void cm_remove_one(struct ib_device *device, void *client_data);
90 static void cm_process_work(struct cm_id_private *cm_id_priv,
91 struct cm_work *work);
92 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv,
93 struct ib_cm_sidr_rep_param *param);
94 static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv,
95 const void *private_data, u8 private_data_len);
96 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv,
97 void *private_data, u8 private_data_len);
98 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv,
99 enum ib_cm_rej_reason reason, void *ari,
100 u8 ari_length, const void *private_data,
101 u8 private_data_len);
102
103 static struct ib_client cm_client = {
104 .name = "cm",
105 .add = cm_add_one,
106 .remove = cm_remove_one
107 };
108
109 static struct ib_cm {
110 spinlock_t lock;
111 struct list_head device_list;
112 rwlock_t device_lock;
113 struct rb_root listen_service_table;
114 u64 listen_service_id;
115 /* struct rb_root peer_service_table; todo: fix peer to peer */
116 struct rb_root remote_qp_table;
117 struct rb_root remote_id_table;
118 struct rb_root remote_sidr_table;
119 struct xarray local_id_table;
120 u32 local_id_next;
121 __be32 random_id_operand;
122 struct list_head timewait_list;
123 struct workqueue_struct *wq;
124 /* Sync on cm change port state */
125 spinlock_t state_lock;
126 } cm;
127
128 /* Counter indexes ordered by attribute ID */
129 enum {
130 CM_REQ_COUNTER,
131 CM_MRA_COUNTER,
132 CM_REJ_COUNTER,
133 CM_REP_COUNTER,
134 CM_RTU_COUNTER,
135 CM_DREQ_COUNTER,
136 CM_DREP_COUNTER,
137 CM_SIDR_REQ_COUNTER,
138 CM_SIDR_REP_COUNTER,
139 CM_LAP_COUNTER,
140 CM_APR_COUNTER,
141 CM_ATTR_COUNT,
142 CM_ATTR_ID_OFFSET = 0x0010,
143 };
144
145 enum {
146 CM_XMIT,
147 CM_XMIT_RETRIES,
148 CM_RECV,
149 CM_RECV_DUPLICATES,
150 CM_COUNTER_GROUPS
151 };
152
153 static char const counter_group_names[CM_COUNTER_GROUPS]
154 [sizeof("cm_rx_duplicates")] = {
155 "cm_tx_msgs", "cm_tx_retries",
156 "cm_rx_msgs", "cm_rx_duplicates"
157 };
158
159 struct cm_counter_group {
160 struct kobject obj;
161 atomic_long_t counter[CM_ATTR_COUNT];
162 };
163
164 struct cm_counter_attribute {
165 struct attribute attr;
166 int index;
167 };
168
169 #define CM_COUNTER_ATTR(_name, _index) \
170 struct cm_counter_attribute cm_##_name##_counter_attr = { \
171 .attr = { .name = __stringify(_name), .mode = 0444 }, \
172 .index = _index \
173 }
174
175 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
176 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
177 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
178 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
179 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
180 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
181 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
182 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
183 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
184 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
185 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
186
187 static struct attribute *cm_counter_default_attrs[] = {
188 &cm_req_counter_attr.attr,
189 &cm_mra_counter_attr.attr,
190 &cm_rej_counter_attr.attr,
191 &cm_rep_counter_attr.attr,
192 &cm_rtu_counter_attr.attr,
193 &cm_dreq_counter_attr.attr,
194 &cm_drep_counter_attr.attr,
195 &cm_sidr_req_counter_attr.attr,
196 &cm_sidr_rep_counter_attr.attr,
197 &cm_lap_counter_attr.attr,
198 &cm_apr_counter_attr.attr,
199 NULL
200 };
201
202 struct cm_port {
203 struct cm_device *cm_dev;
204 struct ib_mad_agent *mad_agent;
205 u8 port_num;
206 struct list_head cm_priv_prim_list;
207 struct list_head cm_priv_altr_list;
208 struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
209 };
210
211 struct cm_device {
212 struct list_head list;
213 struct ib_device *ib_device;
214 u8 ack_delay;
215 int going_down;
216 struct cm_port *port[];
217 };
218
219 struct cm_av {
220 struct cm_port *port;
221 union ib_gid dgid;
222 struct rdma_ah_attr ah_attr;
223 u16 pkey_index;
224 u8 timeout;
225 };
226
227 struct cm_work {
228 struct delayed_work work;
229 struct list_head list;
230 struct cm_port *port;
231 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
232 __be32 local_id; /* Established / timewait */
233 __be32 remote_id;
234 struct ib_cm_event cm_event;
235 struct sa_path_rec path[];
236 };
237
238 struct cm_timewait_info {
239 struct cm_work work;
240 struct list_head list;
241 struct rb_node remote_qp_node;
242 struct rb_node remote_id_node;
243 __be64 remote_ca_guid;
244 __be32 remote_qpn;
245 u8 inserted_remote_qp;
246 u8 inserted_remote_id;
247 };
248
249 struct cm_id_private {
250 struct ib_cm_id id;
251
252 struct rb_node service_node;
253 struct rb_node sidr_id_node;
254 spinlock_t lock; /* Do not acquire inside cm.lock */
255 struct completion comp;
256 refcount_t refcount;
257 /* Number of clients sharing this ib_cm_id. Only valid for listeners.
258 * Protected by the cm.lock spinlock. */
259 int listen_sharecount;
260 struct rcu_head rcu;
261
262 struct ib_mad_send_buf *msg;
263 struct cm_timewait_info *timewait_info;
264 /* todo: use alternate port on send failure */
265 struct cm_av av;
266 struct cm_av alt_av;
267
268 void *private_data;
269 __be64 tid;
270 __be32 local_qpn;
271 __be32 remote_qpn;
272 enum ib_qp_type qp_type;
273 __be32 sq_psn;
274 __be32 rq_psn;
275 int timeout_ms;
276 enum ib_mtu path_mtu;
277 __be16 pkey;
278 u8 private_data_len;
279 u8 max_cm_retries;
280 u8 responder_resources;
281 u8 initiator_depth;
282 u8 retry_count;
283 u8 rnr_retry_count;
284 u8 service_timeout;
285 u8 target_ack_delay;
286
287 struct list_head prim_list;
288 struct list_head altr_list;
289 /* Indicates that the send port mad is registered and av is set */
290 int prim_send_port_not_ready;
291 int altr_send_port_not_ready;
292
293 struct list_head work_list;
294 atomic_t work_count;
295
296 struct rdma_ucm_ece ece;
297 };
298
299 static void cm_work_handler(struct work_struct *work);
300
301 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
302 {
303 if (refcount_dec_and_test(&cm_id_priv->refcount))
304 complete(&cm_id_priv->comp);
305 }
306
307 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
308 struct ib_mad_send_buf **msg)
309 {
310 struct ib_mad_agent *mad_agent;
311 struct ib_mad_send_buf *m;
312 struct ib_ah *ah;
313 struct cm_av *av;
314 unsigned long flags, flags2;
315 int ret = 0;
316
317 /* don't let the port to be released till the agent is down */
318 spin_lock_irqsave(&cm.state_lock, flags2);
319 spin_lock_irqsave(&cm.lock, flags);
320 if (!cm_id_priv->prim_send_port_not_ready)
321 av = &cm_id_priv->av;
322 else if (!cm_id_priv->altr_send_port_not_ready &&
323 (cm_id_priv->alt_av.port))
324 av = &cm_id_priv->alt_av;
325 else {
326 pr_info("%s: not valid CM id\n", __func__);
327 ret = -ENODEV;
328 spin_unlock_irqrestore(&cm.lock, flags);
329 goto out;
330 }
331 spin_unlock_irqrestore(&cm.lock, flags);
332 /* Make sure the port haven't released the mad yet */
333 mad_agent = cm_id_priv->av.port->mad_agent;
334 if (!mad_agent) {
335 pr_info("%s: not a valid MAD agent\n", __func__);
336 ret = -ENODEV;
337 goto out;
338 }
339 ah = rdma_create_ah(mad_agent->qp->pd, &av->ah_attr, 0);
340 if (IS_ERR(ah)) {
341 ret = PTR_ERR(ah);
342 goto out;
343 }
344
345 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
346 av->pkey_index,
347 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
348 GFP_ATOMIC,
349 IB_MGMT_BASE_VERSION);
350 if (IS_ERR(m)) {
351 rdma_destroy_ah(ah, 0);
352 ret = PTR_ERR(m);
353 goto out;
354 }
355
356 /* Timeout set by caller if response is expected. */
357 m->ah = ah;
358 m->retries = cm_id_priv->max_cm_retries;
359
360 refcount_inc(&cm_id_priv->refcount);
361 m->context[0] = cm_id_priv;
362 *msg = m;
363
364 out:
365 spin_unlock_irqrestore(&cm.state_lock, flags2);
366 return ret;
367 }
368
369 static struct ib_mad_send_buf *cm_alloc_response_msg_no_ah(struct cm_port *port,
370 struct ib_mad_recv_wc *mad_recv_wc)
371 {
372 return ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
373 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
374 GFP_ATOMIC,
375 IB_MGMT_BASE_VERSION);
376 }
377
378 static int cm_create_response_msg_ah(struct cm_port *port,
379 struct ib_mad_recv_wc *mad_recv_wc,
380 struct ib_mad_send_buf *msg)
381 {
382 struct ib_ah *ah;
383
384 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
385 mad_recv_wc->recv_buf.grh, port->port_num);
386 if (IS_ERR(ah))
387 return PTR_ERR(ah);
388
389 msg->ah = ah;
390 return 0;
391 }
392
393 static void cm_free_msg(struct ib_mad_send_buf *msg)
394 {
395 if (msg->ah)
396 rdma_destroy_ah(msg->ah, 0);
397 if (msg->context[0])
398 cm_deref_id(msg->context[0]);
399 ib_free_send_mad(msg);
400 }
401
402 static int cm_alloc_response_msg(struct cm_port *port,
403 struct ib_mad_recv_wc *mad_recv_wc,
404 struct ib_mad_send_buf **msg)
405 {
406 struct ib_mad_send_buf *m;
407 int ret;
408
409 m = cm_alloc_response_msg_no_ah(port, mad_recv_wc);
410 if (IS_ERR(m))
411 return PTR_ERR(m);
412
413 ret = cm_create_response_msg_ah(port, mad_recv_wc, m);
414 if (ret) {
415 cm_free_msg(m);
416 return ret;
417 }
418
419 *msg = m;
420 return 0;
421 }
422
423 static void * cm_copy_private_data(const void *private_data,
424 u8 private_data_len)
425 {
426 void *data;
427
428 if (!private_data || !private_data_len)
429 return NULL;
430
431 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
432 if (!data)
433 return ERR_PTR(-ENOMEM);
434
435 return data;
436 }
437
438 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
439 void *private_data, u8 private_data_len)
440 {
441 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
442 kfree(cm_id_priv->private_data);
443
444 cm_id_priv->private_data = private_data;
445 cm_id_priv->private_data_len = private_data_len;
446 }
447
448 static int cm_init_av_for_lap(struct cm_port *port, struct ib_wc *wc,
449 struct ib_grh *grh, struct cm_av *av)
450 {
451 struct rdma_ah_attr new_ah_attr;
452 int ret;
453
454 av->port = port;
455 av->pkey_index = wc->pkey_index;
456
457 /*
458 * av->ah_attr might be initialized based on past wc during incoming
459 * connect request or while sending out connect request. So initialize
460 * a new ah_attr on stack. If initialization fails, old ah_attr is
461 * used for sending any responses. If initialization is successful,
462 * than new ah_attr is used by overwriting old one.
463 */
464 ret = ib_init_ah_attr_from_wc(port->cm_dev->ib_device,
465 port->port_num, wc,
466 grh, &new_ah_attr);
467 if (ret)
468 return ret;
469
470 rdma_move_ah_attr(&av->ah_attr, &new_ah_attr);
471 return 0;
472 }
473
474 static int cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
475 struct ib_grh *grh, struct cm_av *av)
476 {
477 av->port = port;
478 av->pkey_index = wc->pkey_index;
479 return ib_init_ah_attr_from_wc(port->cm_dev->ib_device,
480 port->port_num, wc,
481 grh, &av->ah_attr);
482 }
483
484 static void add_cm_id_to_port_list(struct cm_id_private *cm_id_priv,
485 struct cm_av *av, struct cm_port *port)
486 {
487 unsigned long flags;
488
489 spin_lock_irqsave(&cm.lock, flags);
490 if (&cm_id_priv->av == av)
491 list_add_tail(&cm_id_priv->prim_list, &port->cm_priv_prim_list);
492 else if (&cm_id_priv->alt_av == av)
493 list_add_tail(&cm_id_priv->altr_list, &port->cm_priv_altr_list);
494 else
495 WARN_ON(true);
496 spin_unlock_irqrestore(&cm.lock, flags);
497 }
498
499 static struct cm_port *
500 get_cm_port_from_path(struct sa_path_rec *path, const struct ib_gid_attr *attr)
501 {
502 struct cm_device *cm_dev;
503 struct cm_port *port = NULL;
504 unsigned long flags;
505
506 if (attr) {
507 read_lock_irqsave(&cm.device_lock, flags);
508 list_for_each_entry(cm_dev, &cm.device_list, list) {
509 if (cm_dev->ib_device == attr->device) {
510 port = cm_dev->port[attr->port_num - 1];
511 break;
512 }
513 }
514 read_unlock_irqrestore(&cm.device_lock, flags);
515 } else {
516 /* SGID attribute can be NULL in following
517 * conditions.
518 * (a) Alternative path
519 * (b) IB link layer without GRH
520 * (c) LAP send messages
521 */
522 read_lock_irqsave(&cm.device_lock, flags);
523 list_for_each_entry(cm_dev, &cm.device_list, list) {
524 attr = rdma_find_gid(cm_dev->ib_device,
525 &path->sgid,
526 sa_conv_pathrec_to_gid_type(path),
527 NULL);
528 if (!IS_ERR(attr)) {
529 port = cm_dev->port[attr->port_num - 1];
530 break;
531 }
532 }
533 read_unlock_irqrestore(&cm.device_lock, flags);
534 if (port)
535 rdma_put_gid_attr(attr);
536 }
537 return port;
538 }
539
540 static int cm_init_av_by_path(struct sa_path_rec *path,
541 const struct ib_gid_attr *sgid_attr,
542 struct cm_av *av,
543 struct cm_id_private *cm_id_priv)
544 {
545 struct rdma_ah_attr new_ah_attr;
546 struct cm_device *cm_dev;
547 struct cm_port *port;
548 int ret;
549
550 port = get_cm_port_from_path(path, sgid_attr);
551 if (!port)
552 return -EINVAL;
553 cm_dev = port->cm_dev;
554
555 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
556 be16_to_cpu(path->pkey), &av->pkey_index);
557 if (ret)
558 return ret;
559
560 av->port = port;
561
562 /*
563 * av->ah_attr might be initialized based on wc or during
564 * request processing time which might have reference to sgid_attr.
565 * So initialize a new ah_attr on stack.
566 * If initialization fails, old ah_attr is used for sending any
567 * responses. If initialization is successful, than new ah_attr
568 * is used by overwriting the old one. So that right ah_attr
569 * can be used to return an error response.
570 */
571 ret = ib_init_ah_attr_from_path(cm_dev->ib_device, port->port_num, path,
572 &new_ah_attr, sgid_attr);
573 if (ret)
574 return ret;
575
576 av->timeout = path->packet_life_time + 1;
577 add_cm_id_to_port_list(cm_id_priv, av, port);
578 rdma_move_ah_attr(&av->ah_attr, &new_ah_attr);
579 return 0;
580 }
581
582 static u32 cm_local_id(__be32 local_id)
583 {
584 return (__force u32) (local_id ^ cm.random_id_operand);
585 }
586
587 static struct cm_id_private *cm_acquire_id(__be32 local_id, __be32 remote_id)
588 {
589 struct cm_id_private *cm_id_priv;
590
591 rcu_read_lock();
592 cm_id_priv = xa_load(&cm.local_id_table, cm_local_id(local_id));
593 if (!cm_id_priv || cm_id_priv->id.remote_id != remote_id ||
594 !refcount_inc_not_zero(&cm_id_priv->refcount))
595 cm_id_priv = NULL;
596 rcu_read_unlock();
597
598 return cm_id_priv;
599 }
600
601 /*
602 * Trivial helpers to strip endian annotation and compare; the
603 * endianness doesn't actually matter since we just need a stable
604 * order for the RB tree.
605 */
606 static int be32_lt(__be32 a, __be32 b)
607 {
608 return (__force u32) a < (__force u32) b;
609 }
610
611 static int be32_gt(__be32 a, __be32 b)
612 {
613 return (__force u32) a > (__force u32) b;
614 }
615
616 static int be64_lt(__be64 a, __be64 b)
617 {
618 return (__force u64) a < (__force u64) b;
619 }
620
621 static int be64_gt(__be64 a, __be64 b)
622 {
623 return (__force u64) a > (__force u64) b;
624 }
625
626 /*
627 * Inserts a new cm_id_priv into the listen_service_table. Returns cm_id_priv
628 * if the new ID was inserted, NULL if it could not be inserted due to a
629 * collision, or the existing cm_id_priv ready for shared usage.
630 */
631 static struct cm_id_private *cm_insert_listen(struct cm_id_private *cm_id_priv,
632 ib_cm_handler shared_handler)
633 {
634 struct rb_node **link = &cm.listen_service_table.rb_node;
635 struct rb_node *parent = NULL;
636 struct cm_id_private *cur_cm_id_priv;
637 __be64 service_id = cm_id_priv->id.service_id;
638 __be64 service_mask = cm_id_priv->id.service_mask;
639 unsigned long flags;
640
641 spin_lock_irqsave(&cm.lock, flags);
642 while (*link) {
643 parent = *link;
644 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
645 service_node);
646 if ((cur_cm_id_priv->id.service_mask & service_id) ==
647 (service_mask & cur_cm_id_priv->id.service_id) &&
648 (cm_id_priv->id.device == cur_cm_id_priv->id.device)) {
649 /*
650 * Sharing an ib_cm_id with different handlers is not
651 * supported
652 */
653 if (cur_cm_id_priv->id.cm_handler != shared_handler ||
654 cur_cm_id_priv->id.context ||
655 WARN_ON(!cur_cm_id_priv->id.cm_handler)) {
656 spin_unlock_irqrestore(&cm.lock, flags);
657 return NULL;
658 }
659 refcount_inc(&cur_cm_id_priv->refcount);
660 cur_cm_id_priv->listen_sharecount++;
661 spin_unlock_irqrestore(&cm.lock, flags);
662 return cur_cm_id_priv;
663 }
664
665 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
666 link = &(*link)->rb_left;
667 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
668 link = &(*link)->rb_right;
669 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
670 link = &(*link)->rb_left;
671 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
672 link = &(*link)->rb_right;
673 else
674 link = &(*link)->rb_right;
675 }
676 cm_id_priv->listen_sharecount++;
677 rb_link_node(&cm_id_priv->service_node, parent, link);
678 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
679 spin_unlock_irqrestore(&cm.lock, flags);
680 return cm_id_priv;
681 }
682
683 static struct cm_id_private * cm_find_listen(struct ib_device *device,
684 __be64 service_id)
685 {
686 struct rb_node *node = cm.listen_service_table.rb_node;
687 struct cm_id_private *cm_id_priv;
688
689 while (node) {
690 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
691 if ((cm_id_priv->id.service_mask & service_id) ==
692 cm_id_priv->id.service_id &&
693 (cm_id_priv->id.device == device)) {
694 refcount_inc(&cm_id_priv->refcount);
695 return cm_id_priv;
696 }
697 if (device < cm_id_priv->id.device)
698 node = node->rb_left;
699 else if (device > cm_id_priv->id.device)
700 node = node->rb_right;
701 else if (be64_lt(service_id, cm_id_priv->id.service_id))
702 node = node->rb_left;
703 else if (be64_gt(service_id, cm_id_priv->id.service_id))
704 node = node->rb_right;
705 else
706 node = node->rb_right;
707 }
708 return NULL;
709 }
710
711 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
712 *timewait_info)
713 {
714 struct rb_node **link = &cm.remote_id_table.rb_node;
715 struct rb_node *parent = NULL;
716 struct cm_timewait_info *cur_timewait_info;
717 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
718 __be32 remote_id = timewait_info->work.remote_id;
719
720 while (*link) {
721 parent = *link;
722 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
723 remote_id_node);
724 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
725 link = &(*link)->rb_left;
726 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
727 link = &(*link)->rb_right;
728 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
729 link = &(*link)->rb_left;
730 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
731 link = &(*link)->rb_right;
732 else
733 return cur_timewait_info;
734 }
735 timewait_info->inserted_remote_id = 1;
736 rb_link_node(&timewait_info->remote_id_node, parent, link);
737 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
738 return NULL;
739 }
740
741 static struct cm_id_private *cm_find_remote_id(__be64 remote_ca_guid,
742 __be32 remote_id)
743 {
744 struct rb_node *node = cm.remote_id_table.rb_node;
745 struct cm_timewait_info *timewait_info;
746 struct cm_id_private *res = NULL;
747
748 spin_lock_irq(&cm.lock);
749 while (node) {
750 timewait_info = rb_entry(node, struct cm_timewait_info,
751 remote_id_node);
752 if (be32_lt(remote_id, timewait_info->work.remote_id))
753 node = node->rb_left;
754 else if (be32_gt(remote_id, timewait_info->work.remote_id))
755 node = node->rb_right;
756 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
757 node = node->rb_left;
758 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
759 node = node->rb_right;
760 else {
761 res = cm_acquire_id(timewait_info->work.local_id,
762 timewait_info->work.remote_id);
763 break;
764 }
765 }
766 spin_unlock_irq(&cm.lock);
767 return res;
768 }
769
770 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
771 *timewait_info)
772 {
773 struct rb_node **link = &cm.remote_qp_table.rb_node;
774 struct rb_node *parent = NULL;
775 struct cm_timewait_info *cur_timewait_info;
776 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
777 __be32 remote_qpn = timewait_info->remote_qpn;
778
779 while (*link) {
780 parent = *link;
781 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
782 remote_qp_node);
783 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
784 link = &(*link)->rb_left;
785 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
786 link = &(*link)->rb_right;
787 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
788 link = &(*link)->rb_left;
789 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
790 link = &(*link)->rb_right;
791 else
792 return cur_timewait_info;
793 }
794 timewait_info->inserted_remote_qp = 1;
795 rb_link_node(&timewait_info->remote_qp_node, parent, link);
796 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
797 return NULL;
798 }
799
800 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
801 *cm_id_priv)
802 {
803 struct rb_node **link = &cm.remote_sidr_table.rb_node;
804 struct rb_node *parent = NULL;
805 struct cm_id_private *cur_cm_id_priv;
806 union ib_gid *port_gid = &cm_id_priv->av.dgid;
807 __be32 remote_id = cm_id_priv->id.remote_id;
808
809 while (*link) {
810 parent = *link;
811 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
812 sidr_id_node);
813 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
814 link = &(*link)->rb_left;
815 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
816 link = &(*link)->rb_right;
817 else {
818 int cmp;
819 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
820 sizeof *port_gid);
821 if (cmp < 0)
822 link = &(*link)->rb_left;
823 else if (cmp > 0)
824 link = &(*link)->rb_right;
825 else
826 return cur_cm_id_priv;
827 }
828 }
829 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
830 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
831 return NULL;
832 }
833
834 static struct cm_id_private *cm_alloc_id_priv(struct ib_device *device,
835 ib_cm_handler cm_handler,
836 void *context)
837 {
838 struct cm_id_private *cm_id_priv;
839 u32 id;
840 int ret;
841
842 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
843 if (!cm_id_priv)
844 return ERR_PTR(-ENOMEM);
845
846 cm_id_priv->id.state = IB_CM_IDLE;
847 cm_id_priv->id.device = device;
848 cm_id_priv->id.cm_handler = cm_handler;
849 cm_id_priv->id.context = context;
850 cm_id_priv->id.remote_cm_qpn = 1;
851
852 RB_CLEAR_NODE(&cm_id_priv->service_node);
853 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
854 spin_lock_init(&cm_id_priv->lock);
855 init_completion(&cm_id_priv->comp);
856 INIT_LIST_HEAD(&cm_id_priv->work_list);
857 INIT_LIST_HEAD(&cm_id_priv->prim_list);
858 INIT_LIST_HEAD(&cm_id_priv->altr_list);
859 atomic_set(&cm_id_priv->work_count, -1);
860 refcount_set(&cm_id_priv->refcount, 1);
861
862 ret = xa_alloc_cyclic(&cm.local_id_table, &id, NULL, xa_limit_32b,
863 &cm.local_id_next, GFP_KERNEL);
864 if (ret < 0)
865 goto error;
866 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
867
868 return cm_id_priv;
869
870 error:
871 kfree(cm_id_priv);
872 return ERR_PTR(ret);
873 }
874
875 /*
876 * Make the ID visible to the MAD handlers and other threads that use the
877 * xarray.
878 */
879 static void cm_finalize_id(struct cm_id_private *cm_id_priv)
880 {
881 xa_store(&cm.local_id_table, cm_local_id(cm_id_priv->id.local_id),
882 cm_id_priv, GFP_ATOMIC);
883 }
884
885 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
886 ib_cm_handler cm_handler,
887 void *context)
888 {
889 struct cm_id_private *cm_id_priv;
890
891 cm_id_priv = cm_alloc_id_priv(device, cm_handler, context);
892 if (IS_ERR(cm_id_priv))
893 return ERR_CAST(cm_id_priv);
894
895 cm_finalize_id(cm_id_priv);
896 return &cm_id_priv->id;
897 }
898 EXPORT_SYMBOL(ib_create_cm_id);
899
900 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
901 {
902 struct cm_work *work;
903
904 if (list_empty(&cm_id_priv->work_list))
905 return NULL;
906
907 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
908 list_del(&work->list);
909 return work;
910 }
911
912 static void cm_free_work(struct cm_work *work)
913 {
914 if (work->mad_recv_wc)
915 ib_free_recv_mad(work->mad_recv_wc);
916 kfree(work);
917 }
918
919 static void cm_queue_work_unlock(struct cm_id_private *cm_id_priv,
920 struct cm_work *work)
921 __releases(&cm_id_priv->lock)
922 {
923 bool immediate;
924
925 /*
926 * To deliver the event to the user callback we have the drop the
927 * spinlock, however, we need to ensure that the user callback is single
928 * threaded and receives events in the temporal order. If there are
929 * already events being processed then thread new events onto a list,
930 * the thread currently processing will pick them up.
931 */
932 immediate = atomic_inc_and_test(&cm_id_priv->work_count);
933 if (!immediate) {
934 list_add_tail(&work->list, &cm_id_priv->work_list);
935 /*
936 * This routine always consumes incoming reference. Once queued
937 * to the work_list then a reference is held by the thread
938 * currently running cm_process_work() and this reference is not
939 * needed.
940 */
941 cm_deref_id(cm_id_priv);
942 }
943 spin_unlock_irq(&cm_id_priv->lock);
944
945 if (immediate)
946 cm_process_work(cm_id_priv, work);
947 }
948
949 static inline int cm_convert_to_ms(int iba_time)
950 {
951 /* approximate conversion to ms from 4.096us x 2^iba_time */
952 return 1 << max(iba_time - 8, 0);
953 }
954
955 /*
956 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
957 * Because of how ack_timeout is stored, adding one doubles the timeout.
958 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
959 * increment it (round up) only if the other is within 50%.
960 */
961 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
962 {
963 int ack_timeout = packet_life_time + 1;
964
965 if (ack_timeout >= ca_ack_delay)
966 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
967 else
968 ack_timeout = ca_ack_delay +
969 (ack_timeout >= (ca_ack_delay - 1));
970
971 return min(31, ack_timeout);
972 }
973
974 static void cm_remove_remote(struct cm_id_private *cm_id_priv)
975 {
976 struct cm_timewait_info *timewait_info = cm_id_priv->timewait_info;
977
978 if (timewait_info->inserted_remote_id) {
979 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
980 timewait_info->inserted_remote_id = 0;
981 }
982
983 if (timewait_info->inserted_remote_qp) {
984 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
985 timewait_info->inserted_remote_qp = 0;
986 }
987 }
988
989 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
990 {
991 struct cm_timewait_info *timewait_info;
992
993 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
994 if (!timewait_info)
995 return ERR_PTR(-ENOMEM);
996
997 timewait_info->work.local_id = local_id;
998 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
999 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
1000 return timewait_info;
1001 }
1002
1003 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
1004 {
1005 int wait_time;
1006 unsigned long flags;
1007 struct cm_device *cm_dev;
1008
1009 lockdep_assert_held(&cm_id_priv->lock);
1010
1011 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client);
1012 if (!cm_dev)
1013 return;
1014
1015 spin_lock_irqsave(&cm.lock, flags);
1016 cm_remove_remote(cm_id_priv);
1017 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
1018 spin_unlock_irqrestore(&cm.lock, flags);
1019
1020 /*
1021 * The cm_id could be destroyed by the user before we exit timewait.
1022 * To protect against this, we search for the cm_id after exiting
1023 * timewait before notifying the user that we've exited timewait.
1024 */
1025 cm_id_priv->id.state = IB_CM_TIMEWAIT;
1026 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
1027
1028 /* Check if the device started its remove_one */
1029 spin_lock_irqsave(&cm.lock, flags);
1030 if (!cm_dev->going_down)
1031 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
1032 msecs_to_jiffies(wait_time));
1033 spin_unlock_irqrestore(&cm.lock, flags);
1034
1035 /*
1036 * The timewait_info is converted into a work and gets freed during
1037 * cm_free_work() in cm_timewait_handler().
1038 */
1039 BUILD_BUG_ON(offsetof(struct cm_timewait_info, work) != 0);
1040 cm_id_priv->timewait_info = NULL;
1041 }
1042
1043 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
1044 {
1045 unsigned long flags;
1046
1047 lockdep_assert_held(&cm_id_priv->lock);
1048
1049 cm_id_priv->id.state = IB_CM_IDLE;
1050 if (cm_id_priv->timewait_info) {
1051 spin_lock_irqsave(&cm.lock, flags);
1052 cm_remove_remote(cm_id_priv);
1053 spin_unlock_irqrestore(&cm.lock, flags);
1054 kfree(cm_id_priv->timewait_info);
1055 cm_id_priv->timewait_info = NULL;
1056 }
1057 }
1058
1059 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
1060 {
1061 struct cm_id_private *cm_id_priv;
1062 struct cm_work *work;
1063
1064 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1065 spin_lock_irq(&cm_id_priv->lock);
1066 retest:
1067 switch (cm_id->state) {
1068 case IB_CM_LISTEN:
1069 spin_lock(&cm.lock);
1070 if (--cm_id_priv->listen_sharecount > 0) {
1071 /* The id is still shared. */
1072 WARN_ON(refcount_read(&cm_id_priv->refcount) == 1);
1073 spin_unlock(&cm.lock);
1074 spin_unlock_irq(&cm_id_priv->lock);
1075 cm_deref_id(cm_id_priv);
1076 return;
1077 }
1078 cm_id->state = IB_CM_IDLE;
1079 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
1080 RB_CLEAR_NODE(&cm_id_priv->service_node);
1081 spin_unlock(&cm.lock);
1082 break;
1083 case IB_CM_SIDR_REQ_SENT:
1084 cm_id->state = IB_CM_IDLE;
1085 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1086 break;
1087 case IB_CM_SIDR_REQ_RCVD:
1088 cm_send_sidr_rep_locked(cm_id_priv,
1089 &(struct ib_cm_sidr_rep_param){
1090 .status = IB_SIDR_REJECT });
1091 /* cm_send_sidr_rep_locked will not move to IDLE if it fails */
1092 cm_id->state = IB_CM_IDLE;
1093 break;
1094 case IB_CM_REQ_SENT:
1095 case IB_CM_MRA_REQ_RCVD:
1096 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1097 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_TIMEOUT,
1098 &cm_id_priv->id.device->node_guid,
1099 sizeof(cm_id_priv->id.device->node_guid),
1100 NULL, 0);
1101 break;
1102 case IB_CM_REQ_RCVD:
1103 if (err == -ENOMEM) {
1104 /* Do not reject to allow future retries. */
1105 cm_reset_to_idle(cm_id_priv);
1106 } else {
1107 cm_send_rej_locked(cm_id_priv,
1108 IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
1109 NULL, 0);
1110 }
1111 break;
1112 case IB_CM_REP_SENT:
1113 case IB_CM_MRA_REP_RCVD:
1114 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1115 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL,
1116 0, NULL, 0);
1117 goto retest;
1118 case IB_CM_MRA_REQ_SENT:
1119 case IB_CM_REP_RCVD:
1120 case IB_CM_MRA_REP_SENT:
1121 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL,
1122 0, NULL, 0);
1123 break;
1124 case IB_CM_ESTABLISHED:
1125 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
1126 cm_id->state = IB_CM_IDLE;
1127 break;
1128 }
1129 cm_send_dreq_locked(cm_id_priv, NULL, 0);
1130 goto retest;
1131 case IB_CM_DREQ_SENT:
1132 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1133 cm_enter_timewait(cm_id_priv);
1134 goto retest;
1135 case IB_CM_DREQ_RCVD:
1136 cm_send_drep_locked(cm_id_priv, NULL, 0);
1137 WARN_ON(cm_id->state != IB_CM_TIMEWAIT);
1138 goto retest;
1139 case IB_CM_TIMEWAIT:
1140 /*
1141 * The cm_acquire_id in cm_timewait_handler will stop working
1142 * once we do xa_erase below, so just move to idle here for
1143 * consistency.
1144 */
1145 cm_id->state = IB_CM_IDLE;
1146 break;
1147 case IB_CM_IDLE:
1148 break;
1149 }
1150 WARN_ON(cm_id->state != IB_CM_IDLE);
1151
1152 spin_lock(&cm.lock);
1153 /* Required for cleanup paths related cm_req_handler() */
1154 if (cm_id_priv->timewait_info) {
1155 cm_remove_remote(cm_id_priv);
1156 kfree(cm_id_priv->timewait_info);
1157 cm_id_priv->timewait_info = NULL;
1158 }
1159 if (!list_empty(&cm_id_priv->altr_list) &&
1160 (!cm_id_priv->altr_send_port_not_ready))
1161 list_del(&cm_id_priv->altr_list);
1162 if (!list_empty(&cm_id_priv->prim_list) &&
1163 (!cm_id_priv->prim_send_port_not_ready))
1164 list_del(&cm_id_priv->prim_list);
1165 WARN_ON(cm_id_priv->listen_sharecount);
1166 WARN_ON(!RB_EMPTY_NODE(&cm_id_priv->service_node));
1167 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node))
1168 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
1169 spin_unlock(&cm.lock);
1170 spin_unlock_irq(&cm_id_priv->lock);
1171
1172 xa_erase(&cm.local_id_table, cm_local_id(cm_id->local_id));
1173 cm_deref_id(cm_id_priv);
1174 wait_for_completion(&cm_id_priv->comp);
1175 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
1176 cm_free_work(work);
1177
1178 rdma_destroy_ah_attr(&cm_id_priv->av.ah_attr);
1179 rdma_destroy_ah_attr(&cm_id_priv->alt_av.ah_attr);
1180 kfree(cm_id_priv->private_data);
1181 kfree_rcu(cm_id_priv, rcu);
1182 }
1183
1184 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
1185 {
1186 cm_destroy_id(cm_id, 0);
1187 }
1188 EXPORT_SYMBOL(ib_destroy_cm_id);
1189
1190 static int cm_init_listen(struct cm_id_private *cm_id_priv, __be64 service_id,
1191 __be64 service_mask)
1192 {
1193 service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
1194 service_id &= service_mask;
1195 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
1196 (service_id != IB_CM_ASSIGN_SERVICE_ID))
1197 return -EINVAL;
1198
1199 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
1200 cm_id_priv->id.service_id = cpu_to_be64(cm.listen_service_id++);
1201 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
1202 } else {
1203 cm_id_priv->id.service_id = service_id;
1204 cm_id_priv->id.service_mask = service_mask;
1205 }
1206 return 0;
1207 }
1208
1209 /**
1210 * ib_cm_listen - Initiates listening on the specified service ID for
1211 * connection and service ID resolution requests.
1212 * @cm_id: Connection identifier associated with the listen request.
1213 * @service_id: Service identifier matched against incoming connection
1214 * and service ID resolution requests. The service ID should be specified
1215 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1216 * assign a service ID to the caller.
1217 * @service_mask: Mask applied to service ID used to listen across a
1218 * range of service IDs. If set to 0, the service ID is matched
1219 * exactly. This parameter is ignored if %service_id is set to
1220 * IB_CM_ASSIGN_SERVICE_ID.
1221 */
1222 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask)
1223 {
1224 struct cm_id_private *cm_id_priv =
1225 container_of(cm_id, struct cm_id_private, id);
1226 unsigned long flags;
1227 int ret;
1228
1229 spin_lock_irqsave(&cm_id_priv->lock, flags);
1230 if (cm_id_priv->id.state != IB_CM_IDLE) {
1231 ret = -EINVAL;
1232 goto out;
1233 }
1234
1235 ret = cm_init_listen(cm_id_priv, service_id, service_mask);
1236 if (ret)
1237 goto out;
1238
1239 if (!cm_insert_listen(cm_id_priv, NULL)) {
1240 ret = -EBUSY;
1241 goto out;
1242 }
1243
1244 cm_id_priv->id.state = IB_CM_LISTEN;
1245 ret = 0;
1246
1247 out:
1248 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1249 return ret;
1250 }
1251 EXPORT_SYMBOL(ib_cm_listen);
1252
1253 /**
1254 * ib_cm_insert_listen - Create a new listening ib_cm_id and listen on
1255 * the given service ID.
1256 *
1257 * If there's an existing ID listening on that same device and service ID,
1258 * return it.
1259 *
1260 * @device: Device associated with the cm_id. All related communication will
1261 * be associated with the specified device.
1262 * @cm_handler: Callback invoked to notify the user of CM events.
1263 * @service_id: Service identifier matched against incoming connection
1264 * and service ID resolution requests. The service ID should be specified
1265 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1266 * assign a service ID to the caller.
1267 *
1268 * Callers should call ib_destroy_cm_id when done with the listener ID.
1269 */
1270 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device,
1271 ib_cm_handler cm_handler,
1272 __be64 service_id)
1273 {
1274 struct cm_id_private *listen_id_priv;
1275 struct cm_id_private *cm_id_priv;
1276 int err = 0;
1277
1278 /* Create an ID in advance, since the creation may sleep */
1279 cm_id_priv = cm_alloc_id_priv(device, cm_handler, NULL);
1280 if (IS_ERR(cm_id_priv))
1281 return ERR_CAST(cm_id_priv);
1282
1283 err = cm_init_listen(cm_id_priv, service_id, 0);
1284 if (err)
1285 return ERR_PTR(err);
1286
1287 spin_lock_irq(&cm_id_priv->lock);
1288 listen_id_priv = cm_insert_listen(cm_id_priv, cm_handler);
1289 if (listen_id_priv != cm_id_priv) {
1290 spin_unlock_irq(&cm_id_priv->lock);
1291 ib_destroy_cm_id(&cm_id_priv->id);
1292 if (!listen_id_priv)
1293 return ERR_PTR(-EINVAL);
1294 return &listen_id_priv->id;
1295 }
1296 cm_id_priv->id.state = IB_CM_LISTEN;
1297 spin_unlock_irq(&cm_id_priv->lock);
1298
1299 /*
1300 * A listen ID does not need to be in the xarray since it does not
1301 * receive mads, is not placed in the remote_id or remote_qpn rbtree,
1302 * and does not enter timewait.
1303 */
1304
1305 return &cm_id_priv->id;
1306 }
1307 EXPORT_SYMBOL(ib_cm_insert_listen);
1308
1309 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv)
1310 {
1311 u64 hi_tid, low_tid;
1312
1313 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
1314 low_tid = (u64)cm_id_priv->id.local_id;
1315 return cpu_to_be64(hi_tid | low_tid);
1316 }
1317
1318 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
1319 __be16 attr_id, __be64 tid)
1320 {
1321 hdr->base_version = IB_MGMT_BASE_VERSION;
1322 hdr->mgmt_class = IB_MGMT_CLASS_CM;
1323 hdr->class_version = IB_CM_CLASS_VERSION;
1324 hdr->method = IB_MGMT_METHOD_SEND;
1325 hdr->attr_id = attr_id;
1326 hdr->tid = tid;
1327 }
1328
1329 static void cm_format_mad_ece_hdr(struct ib_mad_hdr *hdr, __be16 attr_id,
1330 __be64 tid, u32 attr_mod)
1331 {
1332 cm_format_mad_hdr(hdr, attr_id, tid);
1333 hdr->attr_mod = cpu_to_be32(attr_mod);
1334 }
1335
1336 static void cm_format_req(struct cm_req_msg *req_msg,
1337 struct cm_id_private *cm_id_priv,
1338 struct ib_cm_req_param *param)
1339 {
1340 struct sa_path_rec *pri_path = param->primary_path;
1341 struct sa_path_rec *alt_path = param->alternate_path;
1342 bool pri_ext = false;
1343
1344 if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA)
1345 pri_ext = opa_is_extended_lid(pri_path->opa.dlid,
1346 pri_path->opa.slid);
1347
1348 cm_format_mad_ece_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1349 cm_form_tid(cm_id_priv), param->ece.attr_mod);
1350
1351 IBA_SET(CM_REQ_LOCAL_COMM_ID, req_msg,
1352 be32_to_cpu(cm_id_priv->id.local_id));
1353 IBA_SET(CM_REQ_SERVICE_ID, req_msg, be64_to_cpu(param->service_id));
1354 IBA_SET(CM_REQ_LOCAL_CA_GUID, req_msg,
1355 be64_to_cpu(cm_id_priv->id.device->node_guid));
1356 IBA_SET(CM_REQ_LOCAL_QPN, req_msg, param->qp_num);
1357 IBA_SET(CM_REQ_INITIATOR_DEPTH, req_msg, param->initiator_depth);
1358 IBA_SET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg,
1359 param->remote_cm_response_timeout);
1360 cm_req_set_qp_type(req_msg, param->qp_type);
1361 IBA_SET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg, param->flow_control);
1362 IBA_SET(CM_REQ_STARTING_PSN, req_msg, param->starting_psn);
1363 IBA_SET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg,
1364 param->local_cm_response_timeout);
1365 IBA_SET(CM_REQ_PARTITION_KEY, req_msg,
1366 be16_to_cpu(param->primary_path->pkey));
1367 IBA_SET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg,
1368 param->primary_path->mtu);
1369 IBA_SET(CM_REQ_MAX_CM_RETRIES, req_msg, param->max_cm_retries);
1370
1371 if (param->qp_type != IB_QPT_XRC_INI) {
1372 IBA_SET(CM_REQ_RESPONDER_RESOURCES, req_msg,
1373 param->responder_resources);
1374 IBA_SET(CM_REQ_RETRY_COUNT, req_msg, param->retry_count);
1375 IBA_SET(CM_REQ_RNR_RETRY_COUNT, req_msg,
1376 param->rnr_retry_count);
1377 IBA_SET(CM_REQ_SRQ, req_msg, param->srq);
1378 }
1379
1380 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) =
1381 pri_path->sgid;
1382 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) =
1383 pri_path->dgid;
1384 if (pri_ext) {
1385 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg)
1386 ->global.interface_id =
1387 OPA_MAKE_ID(be32_to_cpu(pri_path->opa.slid));
1388 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg)
1389 ->global.interface_id =
1390 OPA_MAKE_ID(be32_to_cpu(pri_path->opa.dlid));
1391 }
1392 if (pri_path->hop_limit <= 1) {
1393 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
1394 be16_to_cpu(pri_ext ? 0 :
1395 htons(ntohl(sa_path_get_slid(
1396 pri_path)))));
1397 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
1398 be16_to_cpu(pri_ext ? 0 :
1399 htons(ntohl(sa_path_get_dlid(
1400 pri_path)))));
1401 } else {
1402 /* Work-around until there's a way to obtain remote LID info */
1403 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
1404 be16_to_cpu(IB_LID_PERMISSIVE));
1405 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
1406 be16_to_cpu(IB_LID_PERMISSIVE));
1407 }
1408 IBA_SET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg,
1409 be32_to_cpu(pri_path->flow_label));
1410 IBA_SET(CM_REQ_PRIMARY_PACKET_RATE, req_msg, pri_path->rate);
1411 IBA_SET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg, pri_path->traffic_class);
1412 IBA_SET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg, pri_path->hop_limit);
1413 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, pri_path->sl);
1414 IBA_SET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg,
1415 (pri_path->hop_limit <= 1));
1416 IBA_SET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg,
1417 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1418 pri_path->packet_life_time));
1419
1420 if (alt_path) {
1421 bool alt_ext = false;
1422
1423 if (alt_path->rec_type == SA_PATH_REC_TYPE_OPA)
1424 alt_ext = opa_is_extended_lid(alt_path->opa.dlid,
1425 alt_path->opa.slid);
1426
1427 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg) =
1428 alt_path->sgid;
1429 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg) =
1430 alt_path->dgid;
1431 if (alt_ext) {
1432 IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID,
1433 req_msg)
1434 ->global.interface_id =
1435 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.slid));
1436 IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID,
1437 req_msg)
1438 ->global.interface_id =
1439 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.dlid));
1440 }
1441 if (alt_path->hop_limit <= 1) {
1442 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
1443 be16_to_cpu(
1444 alt_ext ? 0 :
1445 htons(ntohl(sa_path_get_slid(
1446 alt_path)))));
1447 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
1448 be16_to_cpu(
1449 alt_ext ? 0 :
1450 htons(ntohl(sa_path_get_dlid(
1451 alt_path)))));
1452 } else {
1453 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
1454 be16_to_cpu(IB_LID_PERMISSIVE));
1455 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
1456 be16_to_cpu(IB_LID_PERMISSIVE));
1457 }
1458 IBA_SET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg,
1459 be32_to_cpu(alt_path->flow_label));
1460 IBA_SET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg, alt_path->rate);
1461 IBA_SET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg,
1462 alt_path->traffic_class);
1463 IBA_SET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg,
1464 alt_path->hop_limit);
1465 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, alt_path->sl);
1466 IBA_SET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg,
1467 (alt_path->hop_limit <= 1));
1468 IBA_SET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg,
1469 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1470 alt_path->packet_life_time));
1471 }
1472 IBA_SET(CM_REQ_VENDOR_ID, req_msg, param->ece.vendor_id);
1473
1474 if (param->private_data && param->private_data_len)
1475 IBA_SET_MEM(CM_REQ_PRIVATE_DATA, req_msg, param->private_data,
1476 param->private_data_len);
1477 }
1478
1479 static int cm_validate_req_param(struct ib_cm_req_param *param)
1480 {
1481 if (!param->primary_path)
1482 return -EINVAL;
1483
1484 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
1485 param->qp_type != IB_QPT_XRC_INI)
1486 return -EINVAL;
1487
1488 if (param->private_data &&
1489 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1490 return -EINVAL;
1491
1492 if (param->alternate_path &&
1493 (param->alternate_path->pkey != param->primary_path->pkey ||
1494 param->alternate_path->mtu != param->primary_path->mtu))
1495 return -EINVAL;
1496
1497 return 0;
1498 }
1499
1500 int ib_send_cm_req(struct ib_cm_id *cm_id,
1501 struct ib_cm_req_param *param)
1502 {
1503 struct cm_id_private *cm_id_priv;
1504 struct cm_req_msg *req_msg;
1505 unsigned long flags;
1506 int ret;
1507
1508 ret = cm_validate_req_param(param);
1509 if (ret)
1510 return ret;
1511
1512 /* Verify that we're not in timewait. */
1513 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1514 spin_lock_irqsave(&cm_id_priv->lock, flags);
1515 if (cm_id->state != IB_CM_IDLE || WARN_ON(cm_id_priv->timewait_info)) {
1516 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1517 ret = -EINVAL;
1518 goto out;
1519 }
1520 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1521
1522 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1523 id.local_id);
1524 if (IS_ERR(cm_id_priv->timewait_info)) {
1525 ret = PTR_ERR(cm_id_priv->timewait_info);
1526 cm_id_priv->timewait_info = NULL;
1527 goto out;
1528 }
1529
1530 ret = cm_init_av_by_path(param->primary_path,
1531 param->ppath_sgid_attr, &cm_id_priv->av,
1532 cm_id_priv);
1533 if (ret)
1534 goto out;
1535 if (param->alternate_path) {
1536 ret = cm_init_av_by_path(param->alternate_path, NULL,
1537 &cm_id_priv->alt_av, cm_id_priv);
1538 if (ret)
1539 goto out;
1540 }
1541 cm_id->service_id = param->service_id;
1542 cm_id->service_mask = ~cpu_to_be64(0);
1543 cm_id_priv->timeout_ms = cm_convert_to_ms(
1544 param->primary_path->packet_life_time) * 2 +
1545 cm_convert_to_ms(
1546 param->remote_cm_response_timeout);
1547 cm_id_priv->max_cm_retries = param->max_cm_retries;
1548 cm_id_priv->initiator_depth = param->initiator_depth;
1549 cm_id_priv->responder_resources = param->responder_resources;
1550 cm_id_priv->retry_count = param->retry_count;
1551 cm_id_priv->path_mtu = param->primary_path->mtu;
1552 cm_id_priv->pkey = param->primary_path->pkey;
1553 cm_id_priv->qp_type = param->qp_type;
1554
1555 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1556 if (ret)
1557 goto out;
1558
1559 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1560 cm_format_req(req_msg, cm_id_priv, param);
1561 cm_id_priv->tid = req_msg->hdr.tid;
1562 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1563 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1564
1565 cm_id_priv->local_qpn = cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg));
1566 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg));
1567
1568 trace_icm_send_req(&cm_id_priv->id);
1569 spin_lock_irqsave(&cm_id_priv->lock, flags);
1570 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1571 if (ret) {
1572 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1573 goto error2;
1574 }
1575 BUG_ON(cm_id->state != IB_CM_IDLE);
1576 cm_id->state = IB_CM_REQ_SENT;
1577 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1578 return 0;
1579
1580 error2: cm_free_msg(cm_id_priv->msg);
1581 out: return ret;
1582 }
1583 EXPORT_SYMBOL(ib_send_cm_req);
1584
1585 static int cm_issue_rej(struct cm_port *port,
1586 struct ib_mad_recv_wc *mad_recv_wc,
1587 enum ib_cm_rej_reason reason,
1588 enum cm_msg_response msg_rejected,
1589 void *ari, u8 ari_length)
1590 {
1591 struct ib_mad_send_buf *msg = NULL;
1592 struct cm_rej_msg *rej_msg, *rcv_msg;
1593 int ret;
1594
1595 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1596 if (ret)
1597 return ret;
1598
1599 /* We just need common CM header information. Cast to any message. */
1600 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1601 rej_msg = (struct cm_rej_msg *) msg->mad;
1602
1603 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1604 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg,
1605 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg));
1606 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1607 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg));
1608 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, msg_rejected);
1609 IBA_SET(CM_REJ_REASON, rej_msg, reason);
1610
1611 if (ari && ari_length) {
1612 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length);
1613 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length);
1614 }
1615
1616 trace_icm_issue_rej(
1617 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg),
1618 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg));
1619 ret = ib_post_send_mad(msg, NULL);
1620 if (ret)
1621 cm_free_msg(msg);
1622
1623 return ret;
1624 }
1625
1626 static bool cm_req_has_alt_path(struct cm_req_msg *req_msg)
1627 {
1628 return ((cpu_to_be16(
1629 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg))) ||
1630 (ib_is_opa_gid(IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID,
1631 req_msg))));
1632 }
1633
1634 static void cm_path_set_rec_type(struct ib_device *ib_device, u8 port_num,
1635 struct sa_path_rec *path, union ib_gid *gid)
1636 {
1637 if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num))
1638 path->rec_type = SA_PATH_REC_TYPE_OPA;
1639 else
1640 path->rec_type = SA_PATH_REC_TYPE_IB;
1641 }
1642
1643 static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg,
1644 struct sa_path_rec *primary_path,
1645 struct sa_path_rec *alt_path)
1646 {
1647 u32 lid;
1648
1649 if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1650 sa_path_set_dlid(primary_path,
1651 IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID,
1652 req_msg));
1653 sa_path_set_slid(primary_path,
1654 IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID,
1655 req_msg));
1656 } else {
1657 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1658 CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg));
1659 sa_path_set_dlid(primary_path, lid);
1660
1661 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1662 CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg));
1663 sa_path_set_slid(primary_path, lid);
1664 }
1665
1666 if (!cm_req_has_alt_path(req_msg))
1667 return;
1668
1669 if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1670 sa_path_set_dlid(alt_path,
1671 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID,
1672 req_msg));
1673 sa_path_set_slid(alt_path,
1674 IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID,
1675 req_msg));
1676 } else {
1677 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1678 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg));
1679 sa_path_set_dlid(alt_path, lid);
1680
1681 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1682 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg));
1683 sa_path_set_slid(alt_path, lid);
1684 }
1685 }
1686
1687 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1688 struct sa_path_rec *primary_path,
1689 struct sa_path_rec *alt_path)
1690 {
1691 primary_path->dgid =
1692 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg);
1693 primary_path->sgid =
1694 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg);
1695 primary_path->flow_label =
1696 cpu_to_be32(IBA_GET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg));
1697 primary_path->hop_limit = IBA_GET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg);
1698 primary_path->traffic_class =
1699 IBA_GET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg);
1700 primary_path->reversible = 1;
1701 primary_path->pkey =
1702 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
1703 primary_path->sl = IBA_GET(CM_REQ_PRIMARY_SL, req_msg);
1704 primary_path->mtu_selector = IB_SA_EQ;
1705 primary_path->mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
1706 primary_path->rate_selector = IB_SA_EQ;
1707 primary_path->rate = IBA_GET(CM_REQ_PRIMARY_PACKET_RATE, req_msg);
1708 primary_path->packet_life_time_selector = IB_SA_EQ;
1709 primary_path->packet_life_time =
1710 IBA_GET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg);
1711 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1712 primary_path->service_id =
1713 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
1714 if (sa_path_is_roce(primary_path))
1715 primary_path->roce.route_resolved = false;
1716
1717 if (cm_req_has_alt_path(req_msg)) {
1718 alt_path->dgid = *IBA_GET_MEM_PTR(
1719 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg);
1720 alt_path->sgid = *IBA_GET_MEM_PTR(
1721 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg);
1722 alt_path->flow_label = cpu_to_be32(
1723 IBA_GET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg));
1724 alt_path->hop_limit =
1725 IBA_GET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg);
1726 alt_path->traffic_class =
1727 IBA_GET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg);
1728 alt_path->reversible = 1;
1729 alt_path->pkey =
1730 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
1731 alt_path->sl = IBA_GET(CM_REQ_ALTERNATE_SL, req_msg);
1732 alt_path->mtu_selector = IB_SA_EQ;
1733 alt_path->mtu =
1734 IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
1735 alt_path->rate_selector = IB_SA_EQ;
1736 alt_path->rate = IBA_GET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg);
1737 alt_path->packet_life_time_selector = IB_SA_EQ;
1738 alt_path->packet_life_time =
1739 IBA_GET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg);
1740 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1741 alt_path->service_id =
1742 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
1743
1744 if (sa_path_is_roce(alt_path))
1745 alt_path->roce.route_resolved = false;
1746 }
1747 cm_format_path_lid_from_req(req_msg, primary_path, alt_path);
1748 }
1749
1750 static u16 cm_get_bth_pkey(struct cm_work *work)
1751 {
1752 struct ib_device *ib_dev = work->port->cm_dev->ib_device;
1753 u8 port_num = work->port->port_num;
1754 u16 pkey_index = work->mad_recv_wc->wc->pkey_index;
1755 u16 pkey;
1756 int ret;
1757
1758 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey);
1759 if (ret) {
1760 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n",
1761 port_num, pkey_index, ret);
1762 return 0;
1763 }
1764
1765 return pkey;
1766 }
1767
1768 /**
1769 * cm_opa_to_ib_sgid - Convert OPA SGID to IB SGID
1770 * ULPs (such as IPoIB) do not understand OPA GIDs and will
1771 * reject them as the local_gid will not match the sgid. Therefore,
1772 * change the pathrec's SGID to an IB SGID.
1773 *
1774 * @work: Work completion
1775 * @path: Path record
1776 */
1777 static void cm_opa_to_ib_sgid(struct cm_work *work,
1778 struct sa_path_rec *path)
1779 {
1780 struct ib_device *dev = work->port->cm_dev->ib_device;
1781 u8 port_num = work->port->port_num;
1782
1783 if (rdma_cap_opa_ah(dev, port_num) &&
1784 (ib_is_opa_gid(&path->sgid))) {
1785 union ib_gid sgid;
1786
1787 if (rdma_query_gid(dev, port_num, 0, &sgid)) {
1788 dev_warn(&dev->dev,
1789 "Error updating sgid in CM request\n");
1790 return;
1791 }
1792
1793 path->sgid = sgid;
1794 }
1795 }
1796
1797 static void cm_format_req_event(struct cm_work *work,
1798 struct cm_id_private *cm_id_priv,
1799 struct ib_cm_id *listen_id)
1800 {
1801 struct cm_req_msg *req_msg;
1802 struct ib_cm_req_event_param *param;
1803
1804 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1805 param = &work->cm_event.param.req_rcvd;
1806 param->listen_id = listen_id;
1807 param->bth_pkey = cm_get_bth_pkey(work);
1808 param->port = cm_id_priv->av.port->port_num;
1809 param->primary_path = &work->path[0];
1810 cm_opa_to_ib_sgid(work, param->primary_path);
1811 if (cm_req_has_alt_path(req_msg)) {
1812 param->alternate_path = &work->path[1];
1813 cm_opa_to_ib_sgid(work, param->alternate_path);
1814 } else {
1815 param->alternate_path = NULL;
1816 }
1817 param->remote_ca_guid =
1818 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg));
1819 param->remote_qkey = IBA_GET(CM_REQ_LOCAL_Q_KEY, req_msg);
1820 param->remote_qpn = IBA_GET(CM_REQ_LOCAL_QPN, req_msg);
1821 param->qp_type = cm_req_get_qp_type(req_msg);
1822 param->starting_psn = IBA_GET(CM_REQ_STARTING_PSN, req_msg);
1823 param->responder_resources = IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg);
1824 param->initiator_depth = IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg);
1825 param->local_cm_response_timeout =
1826 IBA_GET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg);
1827 param->flow_control = IBA_GET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg);
1828 param->remote_cm_response_timeout =
1829 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg);
1830 param->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg);
1831 param->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg);
1832 param->srq = IBA_GET(CM_REQ_SRQ, req_msg);
1833 param->ppath_sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
1834 param->ece.vendor_id = IBA_GET(CM_REQ_VENDOR_ID, req_msg);
1835 param->ece.attr_mod = be32_to_cpu(req_msg->hdr.attr_mod);
1836
1837 work->cm_event.private_data =
1838 IBA_GET_MEM_PTR(CM_REQ_PRIVATE_DATA, req_msg);
1839 }
1840
1841 static void cm_process_work(struct cm_id_private *cm_id_priv,
1842 struct cm_work *work)
1843 {
1844 int ret;
1845
1846 /* We will typically only have the current event to report. */
1847 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1848 cm_free_work(work);
1849
1850 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1851 spin_lock_irq(&cm_id_priv->lock);
1852 work = cm_dequeue_work(cm_id_priv);
1853 spin_unlock_irq(&cm_id_priv->lock);
1854 if (!work)
1855 return;
1856
1857 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1858 &work->cm_event);
1859 cm_free_work(work);
1860 }
1861 cm_deref_id(cm_id_priv);
1862 if (ret)
1863 cm_destroy_id(&cm_id_priv->id, ret);
1864 }
1865
1866 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1867 struct cm_id_private *cm_id_priv,
1868 enum cm_msg_response msg_mraed, u8 service_timeout,
1869 const void *private_data, u8 private_data_len)
1870 {
1871 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1872 IBA_SET(CM_MRA_MESSAGE_MRAED, mra_msg, msg_mraed);
1873 IBA_SET(CM_MRA_LOCAL_COMM_ID, mra_msg,
1874 be32_to_cpu(cm_id_priv->id.local_id));
1875 IBA_SET(CM_MRA_REMOTE_COMM_ID, mra_msg,
1876 be32_to_cpu(cm_id_priv->id.remote_id));
1877 IBA_SET(CM_MRA_SERVICE_TIMEOUT, mra_msg, service_timeout);
1878
1879 if (private_data && private_data_len)
1880 IBA_SET_MEM(CM_MRA_PRIVATE_DATA, mra_msg, private_data,
1881 private_data_len);
1882 }
1883
1884 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1885 struct cm_id_private *cm_id_priv,
1886 enum ib_cm_rej_reason reason, void *ari,
1887 u8 ari_length, const void *private_data,
1888 u8 private_data_len, enum ib_cm_state state)
1889 {
1890 lockdep_assert_held(&cm_id_priv->lock);
1891
1892 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1893 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg,
1894 be32_to_cpu(cm_id_priv->id.remote_id));
1895
1896 switch (state) {
1897 case IB_CM_REQ_RCVD:
1898 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, be32_to_cpu(0));
1899 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ);
1900 break;
1901 case IB_CM_MRA_REQ_SENT:
1902 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1903 be32_to_cpu(cm_id_priv->id.local_id));
1904 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ);
1905 break;
1906 case IB_CM_REP_RCVD:
1907 case IB_CM_MRA_REP_SENT:
1908 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1909 be32_to_cpu(cm_id_priv->id.local_id));
1910 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REP);
1911 break;
1912 default:
1913 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1914 be32_to_cpu(cm_id_priv->id.local_id));
1915 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg,
1916 CM_MSG_RESPONSE_OTHER);
1917 break;
1918 }
1919
1920 IBA_SET(CM_REJ_REASON, rej_msg, reason);
1921 if (ari && ari_length) {
1922 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length);
1923 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length);
1924 }
1925
1926 if (private_data && private_data_len)
1927 IBA_SET_MEM(CM_REJ_PRIVATE_DATA, rej_msg, private_data,
1928 private_data_len);
1929 }
1930
1931 static void cm_dup_req_handler(struct cm_work *work,
1932 struct cm_id_private *cm_id_priv)
1933 {
1934 struct ib_mad_send_buf *msg = NULL;
1935 int ret;
1936
1937 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1938 counter[CM_REQ_COUNTER]);
1939
1940 /* Quick state check to discard duplicate REQs. */
1941 spin_lock_irq(&cm_id_priv->lock);
1942 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) {
1943 spin_unlock_irq(&cm_id_priv->lock);
1944 return;
1945 }
1946 spin_unlock_irq(&cm_id_priv->lock);
1947
1948 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1949 if (ret)
1950 return;
1951
1952 spin_lock_irq(&cm_id_priv->lock);
1953 switch (cm_id_priv->id.state) {
1954 case IB_CM_MRA_REQ_SENT:
1955 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1956 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1957 cm_id_priv->private_data,
1958 cm_id_priv->private_data_len);
1959 break;
1960 case IB_CM_TIMEWAIT:
1961 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv,
1962 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0,
1963 IB_CM_TIMEWAIT);
1964 break;
1965 default:
1966 goto unlock;
1967 }
1968 spin_unlock_irq(&cm_id_priv->lock);
1969
1970 trace_icm_send_dup_req(&cm_id_priv->id);
1971 ret = ib_post_send_mad(msg, NULL);
1972 if (ret)
1973 goto free;
1974 return;
1975
1976 unlock: spin_unlock_irq(&cm_id_priv->lock);
1977 free: cm_free_msg(msg);
1978 }
1979
1980 static struct cm_id_private * cm_match_req(struct cm_work *work,
1981 struct cm_id_private *cm_id_priv)
1982 {
1983 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1984 struct cm_timewait_info *timewait_info;
1985 struct cm_req_msg *req_msg;
1986
1987 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1988
1989 /* Check for possible duplicate REQ. */
1990 spin_lock_irq(&cm.lock);
1991 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1992 if (timewait_info) {
1993 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
1994 timewait_info->work.remote_id);
1995 spin_unlock_irq(&cm.lock);
1996 if (cur_cm_id_priv) {
1997 cm_dup_req_handler(work, cur_cm_id_priv);
1998 cm_deref_id(cur_cm_id_priv);
1999 }
2000 return NULL;
2001 }
2002
2003 /* Check for stale connections. */
2004 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
2005 if (timewait_info) {
2006 cm_remove_remote(cm_id_priv);
2007 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2008 timewait_info->work.remote_id);
2009
2010 spin_unlock_irq(&cm.lock);
2011 cm_issue_rej(work->port, work->mad_recv_wc,
2012 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
2013 NULL, 0);
2014 if (cur_cm_id_priv) {
2015 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0);
2016 cm_deref_id(cur_cm_id_priv);
2017 }
2018 return NULL;
2019 }
2020
2021 /* Find matching listen request. */
2022 listen_cm_id_priv = cm_find_listen(
2023 cm_id_priv->id.device,
2024 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)));
2025 if (!listen_cm_id_priv) {
2026 cm_remove_remote(cm_id_priv);
2027 spin_unlock_irq(&cm.lock);
2028 cm_issue_rej(work->port, work->mad_recv_wc,
2029 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
2030 NULL, 0);
2031 return NULL;
2032 }
2033 spin_unlock_irq(&cm.lock);
2034 return listen_cm_id_priv;
2035 }
2036
2037 /*
2038 * Work-around for inter-subnet connections. If the LIDs are permissive,
2039 * we need to override the LID/SL data in the REQ with the LID information
2040 * in the work completion.
2041 */
2042 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
2043 {
2044 if (!IBA_GET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg)) {
2045 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID,
2046 req_msg)) == IB_LID_PERMISSIVE) {
2047 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
2048 be16_to_cpu(ib_lid_be16(wc->slid)));
2049 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, wc->sl);
2050 }
2051
2052 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID,
2053 req_msg)) == IB_LID_PERMISSIVE)
2054 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
2055 wc->dlid_path_bits);
2056 }
2057
2058 if (!IBA_GET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg)) {
2059 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID,
2060 req_msg)) == IB_LID_PERMISSIVE) {
2061 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
2062 be16_to_cpu(ib_lid_be16(wc->slid)));
2063 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, wc->sl);
2064 }
2065
2066 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID,
2067 req_msg)) == IB_LID_PERMISSIVE)
2068 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
2069 wc->dlid_path_bits);
2070 }
2071 }
2072
2073 static int cm_req_handler(struct cm_work *work)
2074 {
2075 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
2076 struct cm_req_msg *req_msg;
2077 const struct ib_global_route *grh;
2078 const struct ib_gid_attr *gid_attr;
2079 int ret;
2080
2081 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
2082
2083 cm_id_priv =
2084 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL);
2085 if (IS_ERR(cm_id_priv))
2086 return PTR_ERR(cm_id_priv);
2087
2088 cm_id_priv->id.remote_id =
2089 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_COMM_ID, req_msg));
2090 cm_id_priv->id.service_id =
2091 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
2092 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
2093 cm_id_priv->tid = req_msg->hdr.tid;
2094 cm_id_priv->timeout_ms = cm_convert_to_ms(
2095 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg));
2096 cm_id_priv->max_cm_retries = IBA_GET(CM_REQ_MAX_CM_RETRIES, req_msg);
2097 cm_id_priv->remote_qpn =
2098 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg));
2099 cm_id_priv->initiator_depth =
2100 IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg);
2101 cm_id_priv->responder_resources =
2102 IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg);
2103 cm_id_priv->path_mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
2104 cm_id_priv->pkey = cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
2105 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg));
2106 cm_id_priv->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg);
2107 cm_id_priv->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg);
2108 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
2109
2110 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2111 work->mad_recv_wc->recv_buf.grh,
2112 &cm_id_priv->av);
2113 if (ret)
2114 goto destroy;
2115 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
2116 id.local_id);
2117 if (IS_ERR(cm_id_priv->timewait_info)) {
2118 ret = PTR_ERR(cm_id_priv->timewait_info);
2119 cm_id_priv->timewait_info = NULL;
2120 goto destroy;
2121 }
2122 cm_id_priv->timewait_info->work.remote_id = cm_id_priv->id.remote_id;
2123 cm_id_priv->timewait_info->remote_ca_guid =
2124 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg));
2125 cm_id_priv->timewait_info->remote_qpn = cm_id_priv->remote_qpn;
2126
2127 /*
2128 * Note that the ID pointer is not in the xarray at this point,
2129 * so this set is only visible to the local thread.
2130 */
2131 cm_id_priv->id.state = IB_CM_REQ_RCVD;
2132
2133 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
2134 if (!listen_cm_id_priv) {
2135 trace_icm_no_listener_err(&cm_id_priv->id);
2136 cm_id_priv->id.state = IB_CM_IDLE;
2137 ret = -EINVAL;
2138 goto destroy;
2139 }
2140
2141 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
2142
2143 memset(&work->path[0], 0, sizeof(work->path[0]));
2144 if (cm_req_has_alt_path(req_msg))
2145 memset(&work->path[1], 0, sizeof(work->path[1]));
2146 grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr);
2147 gid_attr = grh->sgid_attr;
2148
2149 if (gid_attr &&
2150 rdma_protocol_roce(work->port->cm_dev->ib_device,
2151 work->port->port_num)) {
2152 work->path[0].rec_type =
2153 sa_conv_gid_to_pathrec_type(gid_attr->gid_type);
2154 } else {
2155 cm_path_set_rec_type(
2156 work->port->cm_dev->ib_device, work->port->port_num,
2157 &work->path[0],
2158 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID,
2159 req_msg));
2160 }
2161 if (cm_req_has_alt_path(req_msg))
2162 work->path[1].rec_type = work->path[0].rec_type;
2163 cm_format_paths_from_req(req_msg, &work->path[0],
2164 &work->path[1]);
2165 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE)
2166 sa_path_set_dmac(&work->path[0],
2167 cm_id_priv->av.ah_attr.roce.dmac);
2168 work->path[0].hop_limit = grh->hop_limit;
2169 ret = cm_init_av_by_path(&work->path[0], gid_attr, &cm_id_priv->av,
2170 cm_id_priv);
2171 if (ret) {
2172 int err;
2173
2174 err = rdma_query_gid(work->port->cm_dev->ib_device,
2175 work->port->port_num, 0,
2176 &work->path[0].sgid);
2177 if (err)
2178 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID,
2179 NULL, 0, NULL, 0);
2180 else
2181 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID,
2182 &work->path[0].sgid,
2183 sizeof(work->path[0].sgid),
2184 NULL, 0);
2185 goto rejected;
2186 }
2187 if (cm_req_has_alt_path(req_msg)) {
2188 ret = cm_init_av_by_path(&work->path[1], NULL,
2189 &cm_id_priv->alt_av, cm_id_priv);
2190 if (ret) {
2191 ib_send_cm_rej(&cm_id_priv->id,
2192 IB_CM_REJ_INVALID_ALT_GID,
2193 &work->path[0].sgid,
2194 sizeof(work->path[0].sgid), NULL, 0);
2195 goto rejected;
2196 }
2197 }
2198
2199 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
2200 cm_id_priv->id.context = listen_cm_id_priv->id.context;
2201 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
2202
2203 /* Now MAD handlers can see the new ID */
2204 spin_lock_irq(&cm_id_priv->lock);
2205 cm_finalize_id(cm_id_priv);
2206
2207 /* Refcount belongs to the event, pairs with cm_process_work() */
2208 refcount_inc(&cm_id_priv->refcount);
2209 cm_queue_work_unlock(cm_id_priv, work);
2210 /*
2211 * Since this ID was just created and was not made visible to other MAD
2212 * handlers until the cm_finalize_id() above we know that the
2213 * cm_process_work() will deliver the event and the listen_cm_id
2214 * embedded in the event can be derefed here.
2215 */
2216 cm_deref_id(listen_cm_id_priv);
2217 return 0;
2218
2219 rejected:
2220 cm_deref_id(listen_cm_id_priv);
2221 destroy:
2222 ib_destroy_cm_id(&cm_id_priv->id);
2223 return ret;
2224 }
2225
2226 static void cm_format_rep(struct cm_rep_msg *rep_msg,
2227 struct cm_id_private *cm_id_priv,
2228 struct ib_cm_rep_param *param)
2229 {
2230 cm_format_mad_ece_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid,
2231 param->ece.attr_mod);
2232 IBA_SET(CM_REP_LOCAL_COMM_ID, rep_msg,
2233 be32_to_cpu(cm_id_priv->id.local_id));
2234 IBA_SET(CM_REP_REMOTE_COMM_ID, rep_msg,
2235 be32_to_cpu(cm_id_priv->id.remote_id));
2236 IBA_SET(CM_REP_STARTING_PSN, rep_msg, param->starting_psn);
2237 IBA_SET(CM_REP_RESPONDER_RESOURCES, rep_msg,
2238 param->responder_resources);
2239 IBA_SET(CM_REP_TARGET_ACK_DELAY, rep_msg,
2240 cm_id_priv->av.port->cm_dev->ack_delay);
2241 IBA_SET(CM_REP_FAILOVER_ACCEPTED, rep_msg, param->failover_accepted);
2242 IBA_SET(CM_REP_RNR_RETRY_COUNT, rep_msg, param->rnr_retry_count);
2243 IBA_SET(CM_REP_LOCAL_CA_GUID, rep_msg,
2244 be64_to_cpu(cm_id_priv->id.device->node_guid));
2245
2246 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
2247 IBA_SET(CM_REP_INITIATOR_DEPTH, rep_msg,
2248 param->initiator_depth);
2249 IBA_SET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg,
2250 param->flow_control);
2251 IBA_SET(CM_REP_SRQ, rep_msg, param->srq);
2252 IBA_SET(CM_REP_LOCAL_QPN, rep_msg, param->qp_num);
2253 } else {
2254 IBA_SET(CM_REP_SRQ, rep_msg, 1);
2255 IBA_SET(CM_REP_LOCAL_EE_CONTEXT_NUMBER, rep_msg, param->qp_num);
2256 }
2257
2258 IBA_SET(CM_REP_VENDOR_ID_L, rep_msg, param->ece.vendor_id);
2259 IBA_SET(CM_REP_VENDOR_ID_M, rep_msg, param->ece.vendor_id >> 8);
2260 IBA_SET(CM_REP_VENDOR_ID_H, rep_msg, param->ece.vendor_id >> 16);
2261
2262 if (param->private_data && param->private_data_len)
2263 IBA_SET_MEM(CM_REP_PRIVATE_DATA, rep_msg, param->private_data,
2264 param->private_data_len);
2265 }
2266
2267 int ib_send_cm_rep(struct ib_cm_id *cm_id,
2268 struct ib_cm_rep_param *param)
2269 {
2270 struct cm_id_private *cm_id_priv;
2271 struct ib_mad_send_buf *msg;
2272 struct cm_rep_msg *rep_msg;
2273 unsigned long flags;
2274 int ret;
2275
2276 if (param->private_data &&
2277 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
2278 return -EINVAL;
2279
2280 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2281 spin_lock_irqsave(&cm_id_priv->lock, flags);
2282 if (cm_id->state != IB_CM_REQ_RCVD &&
2283 cm_id->state != IB_CM_MRA_REQ_SENT) {
2284 trace_icm_send_rep_err(cm_id_priv->id.local_id, cm_id->state);
2285 ret = -EINVAL;
2286 goto out;
2287 }
2288
2289 ret = cm_alloc_msg(cm_id_priv, &msg);
2290 if (ret)
2291 goto out;
2292
2293 rep_msg = (struct cm_rep_msg *) msg->mad;
2294 cm_format_rep(rep_msg, cm_id_priv, param);
2295 msg->timeout_ms = cm_id_priv->timeout_ms;
2296 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
2297
2298 trace_icm_send_rep(cm_id);
2299 ret = ib_post_send_mad(msg, NULL);
2300 if (ret) {
2301 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2302 cm_free_msg(msg);
2303 return ret;
2304 }
2305
2306 cm_id->state = IB_CM_REP_SENT;
2307 cm_id_priv->msg = msg;
2308 cm_id_priv->initiator_depth = param->initiator_depth;
2309 cm_id_priv->responder_resources = param->responder_resources;
2310 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg));
2311 WARN_ONCE(param->qp_num & 0xFF000000,
2312 "IBTA declares QPN to be 24 bits, but it is 0x%X\n",
2313 param->qp_num);
2314 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
2315
2316 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2317 return ret;
2318 }
2319 EXPORT_SYMBOL(ib_send_cm_rep);
2320
2321 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
2322 struct cm_id_private *cm_id_priv,
2323 const void *private_data,
2324 u8 private_data_len)
2325 {
2326 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
2327 IBA_SET(CM_RTU_LOCAL_COMM_ID, rtu_msg,
2328 be32_to_cpu(cm_id_priv->id.local_id));
2329 IBA_SET(CM_RTU_REMOTE_COMM_ID, rtu_msg,
2330 be32_to_cpu(cm_id_priv->id.remote_id));
2331
2332 if (private_data && private_data_len)
2333 IBA_SET_MEM(CM_RTU_PRIVATE_DATA, rtu_msg, private_data,
2334 private_data_len);
2335 }
2336
2337 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
2338 const void *private_data,
2339 u8 private_data_len)
2340 {
2341 struct cm_id_private *cm_id_priv;
2342 struct ib_mad_send_buf *msg;
2343 unsigned long flags;
2344 void *data;
2345 int ret;
2346
2347 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
2348 return -EINVAL;
2349
2350 data = cm_copy_private_data(private_data, private_data_len);
2351 if (IS_ERR(data))
2352 return PTR_ERR(data);
2353
2354 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2355 spin_lock_irqsave(&cm_id_priv->lock, flags);
2356 if (cm_id->state != IB_CM_REP_RCVD &&
2357 cm_id->state != IB_CM_MRA_REP_SENT) {
2358 trace_icm_send_cm_rtu_err(cm_id);
2359 ret = -EINVAL;
2360 goto error;
2361 }
2362
2363 ret = cm_alloc_msg(cm_id_priv, &msg);
2364 if (ret)
2365 goto error;
2366
2367 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2368 private_data, private_data_len);
2369
2370 trace_icm_send_rtu(cm_id);
2371 ret = ib_post_send_mad(msg, NULL);
2372 if (ret) {
2373 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2374 cm_free_msg(msg);
2375 kfree(data);
2376 return ret;
2377 }
2378
2379 cm_id->state = IB_CM_ESTABLISHED;
2380 cm_set_private_data(cm_id_priv, data, private_data_len);
2381 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2382 return 0;
2383
2384 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2385 kfree(data);
2386 return ret;
2387 }
2388 EXPORT_SYMBOL(ib_send_cm_rtu);
2389
2390 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
2391 {
2392 struct cm_rep_msg *rep_msg;
2393 struct ib_cm_rep_event_param *param;
2394
2395 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2396 param = &work->cm_event.param.rep_rcvd;
2397 param->remote_ca_guid =
2398 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg));
2399 param->remote_qkey = IBA_GET(CM_REP_LOCAL_Q_KEY, rep_msg);
2400 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
2401 param->starting_psn = IBA_GET(CM_REP_STARTING_PSN, rep_msg);
2402 param->responder_resources = IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg);
2403 param->initiator_depth = IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg);
2404 param->target_ack_delay = IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg);
2405 param->failover_accepted = IBA_GET(CM_REP_FAILOVER_ACCEPTED, rep_msg);
2406 param->flow_control = IBA_GET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg);
2407 param->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg);
2408 param->srq = IBA_GET(CM_REP_SRQ, rep_msg);
2409 param->ece.vendor_id = IBA_GET(CM_REP_VENDOR_ID_H, rep_msg) << 16;
2410 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_M, rep_msg) << 8;
2411 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_L, rep_msg);
2412 param->ece.attr_mod = be32_to_cpu(rep_msg->hdr.attr_mod);
2413
2414 work->cm_event.private_data =
2415 IBA_GET_MEM_PTR(CM_REP_PRIVATE_DATA, rep_msg);
2416 }
2417
2418 static void cm_dup_rep_handler(struct cm_work *work)
2419 {
2420 struct cm_id_private *cm_id_priv;
2421 struct cm_rep_msg *rep_msg;
2422 struct ib_mad_send_buf *msg = NULL;
2423 int ret;
2424
2425 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
2426 cm_id_priv = cm_acquire_id(
2427 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)),
2428 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)));
2429 if (!cm_id_priv)
2430 return;
2431
2432 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2433 counter[CM_REP_COUNTER]);
2434 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
2435 if (ret)
2436 goto deref;
2437
2438 spin_lock_irq(&cm_id_priv->lock);
2439 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
2440 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2441 cm_id_priv->private_data,
2442 cm_id_priv->private_data_len);
2443 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
2444 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2445 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
2446 cm_id_priv->private_data,
2447 cm_id_priv->private_data_len);
2448 else
2449 goto unlock;
2450 spin_unlock_irq(&cm_id_priv->lock);
2451
2452 trace_icm_send_dup_rep(&cm_id_priv->id);
2453 ret = ib_post_send_mad(msg, NULL);
2454 if (ret)
2455 goto free;
2456 goto deref;
2457
2458 unlock: spin_unlock_irq(&cm_id_priv->lock);
2459 free: cm_free_msg(msg);
2460 deref: cm_deref_id(cm_id_priv);
2461 }
2462
2463 static int cm_rep_handler(struct cm_work *work)
2464 {
2465 struct cm_id_private *cm_id_priv;
2466 struct cm_rep_msg *rep_msg;
2467 int ret;
2468 struct cm_id_private *cur_cm_id_priv;
2469 struct cm_timewait_info *timewait_info;
2470
2471 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2472 cm_id_priv = cm_acquire_id(
2473 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 0);
2474 if (!cm_id_priv) {
2475 cm_dup_rep_handler(work);
2476 trace_icm_remote_no_priv_err(
2477 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2478 return -EINVAL;
2479 }
2480
2481 cm_format_rep_event(work, cm_id_priv->qp_type);
2482
2483 spin_lock_irq(&cm_id_priv->lock);
2484 switch (cm_id_priv->id.state) {
2485 case IB_CM_REQ_SENT:
2486 case IB_CM_MRA_REQ_RCVD:
2487 break;
2488 default:
2489 ret = -EINVAL;
2490 trace_icm_rep_unknown_err(
2491 IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg),
2492 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg),
2493 cm_id_priv->id.state);
2494 spin_unlock_irq(&cm_id_priv->lock);
2495 goto error;
2496 }
2497
2498 cm_id_priv->timewait_info->work.remote_id =
2499 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg));
2500 cm_id_priv->timewait_info->remote_ca_guid =
2501 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg));
2502 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2503
2504 spin_lock(&cm.lock);
2505 /* Check for duplicate REP. */
2506 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
2507 spin_unlock(&cm.lock);
2508 spin_unlock_irq(&cm_id_priv->lock);
2509 ret = -EINVAL;
2510 trace_icm_insert_failed_err(
2511 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2512 goto error;
2513 }
2514 /* Check for a stale connection. */
2515 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
2516 if (timewait_info) {
2517 cm_remove_remote(cm_id_priv);
2518 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2519 timewait_info->work.remote_id);
2520
2521 spin_unlock(&cm.lock);
2522 spin_unlock_irq(&cm_id_priv->lock);
2523 cm_issue_rej(work->port, work->mad_recv_wc,
2524 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
2525 NULL, 0);
2526 ret = -EINVAL;
2527 trace_icm_staleconn_err(
2528 IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg),
2529 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2530
2531 if (cur_cm_id_priv) {
2532 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0);
2533 cm_deref_id(cur_cm_id_priv);
2534 }
2535
2536 goto error;
2537 }
2538 spin_unlock(&cm.lock);
2539
2540 cm_id_priv->id.state = IB_CM_REP_RCVD;
2541 cm_id_priv->id.remote_id =
2542 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg));
2543 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2544 cm_id_priv->initiator_depth =
2545 IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg);
2546 cm_id_priv->responder_resources =
2547 IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg);
2548 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg));
2549 cm_id_priv->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg);
2550 cm_id_priv->target_ack_delay =
2551 IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg);
2552 cm_id_priv->av.timeout =
2553 cm_ack_timeout(cm_id_priv->target_ack_delay,
2554 cm_id_priv->av.timeout - 1);
2555 cm_id_priv->alt_av.timeout =
2556 cm_ack_timeout(cm_id_priv->target_ack_delay,
2557 cm_id_priv->alt_av.timeout - 1);
2558
2559 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2560 cm_queue_work_unlock(cm_id_priv, work);
2561 return 0;
2562
2563 error:
2564 cm_deref_id(cm_id_priv);
2565 return ret;
2566 }
2567
2568 static int cm_establish_handler(struct cm_work *work)
2569 {
2570 struct cm_id_private *cm_id_priv;
2571
2572 /* See comment in cm_establish about lookup. */
2573 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
2574 if (!cm_id_priv)
2575 return -EINVAL;
2576
2577 spin_lock_irq(&cm_id_priv->lock);
2578 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
2579 spin_unlock_irq(&cm_id_priv->lock);
2580 goto out;
2581 }
2582
2583 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2584 cm_queue_work_unlock(cm_id_priv, work);
2585 return 0;
2586 out:
2587 cm_deref_id(cm_id_priv);
2588 return -EINVAL;
2589 }
2590
2591 static int cm_rtu_handler(struct cm_work *work)
2592 {
2593 struct cm_id_private *cm_id_priv;
2594 struct cm_rtu_msg *rtu_msg;
2595
2596 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
2597 cm_id_priv = cm_acquire_id(
2598 cpu_to_be32(IBA_GET(CM_RTU_REMOTE_COMM_ID, rtu_msg)),
2599 cpu_to_be32(IBA_GET(CM_RTU_LOCAL_COMM_ID, rtu_msg)));
2600 if (!cm_id_priv)
2601 return -EINVAL;
2602
2603 work->cm_event.private_data =
2604 IBA_GET_MEM_PTR(CM_RTU_PRIVATE_DATA, rtu_msg);
2605
2606 spin_lock_irq(&cm_id_priv->lock);
2607 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
2608 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
2609 spin_unlock_irq(&cm_id_priv->lock);
2610 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2611 counter[CM_RTU_COUNTER]);
2612 goto out;
2613 }
2614 cm_id_priv->id.state = IB_CM_ESTABLISHED;
2615
2616 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2617 cm_queue_work_unlock(cm_id_priv, work);
2618 return 0;
2619 out:
2620 cm_deref_id(cm_id_priv);
2621 return -EINVAL;
2622 }
2623
2624 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
2625 struct cm_id_private *cm_id_priv,
2626 const void *private_data,
2627 u8 private_data_len)
2628 {
2629 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
2630 cm_form_tid(cm_id_priv));
2631 IBA_SET(CM_DREQ_LOCAL_COMM_ID, dreq_msg,
2632 be32_to_cpu(cm_id_priv->id.local_id));
2633 IBA_SET(CM_DREQ_REMOTE_COMM_ID, dreq_msg,
2634 be32_to_cpu(cm_id_priv->id.remote_id));
2635 IBA_SET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg,
2636 be32_to_cpu(cm_id_priv->remote_qpn));
2637
2638 if (private_data && private_data_len)
2639 IBA_SET_MEM(CM_DREQ_PRIVATE_DATA, dreq_msg, private_data,
2640 private_data_len);
2641 }
2642
2643 static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv,
2644 const void *private_data, u8 private_data_len)
2645 {
2646 struct ib_mad_send_buf *msg;
2647 int ret;
2648
2649 lockdep_assert_held(&cm_id_priv->lock);
2650
2651 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
2652 return -EINVAL;
2653
2654 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
2655 trace_icm_dreq_skipped(&cm_id_priv->id);
2656 return -EINVAL;
2657 }
2658
2659 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2660 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2661 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2662
2663 ret = cm_alloc_msg(cm_id_priv, &msg);
2664 if (ret) {
2665 cm_enter_timewait(cm_id_priv);
2666 return ret;
2667 }
2668
2669 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2670 private_data, private_data_len);
2671 msg->timeout_ms = cm_id_priv->timeout_ms;
2672 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2673
2674 trace_icm_send_dreq(&cm_id_priv->id);
2675 ret = ib_post_send_mad(msg, NULL);
2676 if (ret) {
2677 cm_enter_timewait(cm_id_priv);
2678 cm_free_msg(msg);
2679 return ret;
2680 }
2681
2682 cm_id_priv->id.state = IB_CM_DREQ_SENT;
2683 cm_id_priv->msg = msg;
2684 return 0;
2685 }
2686
2687 int ib_send_cm_dreq(struct ib_cm_id *cm_id, const void *private_data,
2688 u8 private_data_len)
2689 {
2690 struct cm_id_private *cm_id_priv =
2691 container_of(cm_id, struct cm_id_private, id);
2692 unsigned long flags;
2693 int ret;
2694
2695 spin_lock_irqsave(&cm_id_priv->lock, flags);
2696 ret = cm_send_dreq_locked(cm_id_priv, private_data, private_data_len);
2697 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2698 return ret;
2699 }
2700 EXPORT_SYMBOL(ib_send_cm_dreq);
2701
2702 static void cm_format_drep(struct cm_drep_msg *drep_msg,
2703 struct cm_id_private *cm_id_priv,
2704 const void *private_data,
2705 u8 private_data_len)
2706 {
2707 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2708 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg,
2709 be32_to_cpu(cm_id_priv->id.local_id));
2710 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg,
2711 be32_to_cpu(cm_id_priv->id.remote_id));
2712
2713 if (private_data && private_data_len)
2714 IBA_SET_MEM(CM_DREP_PRIVATE_DATA, drep_msg, private_data,
2715 private_data_len);
2716 }
2717
2718 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv,
2719 void *private_data, u8 private_data_len)
2720 {
2721 struct ib_mad_send_buf *msg;
2722 int ret;
2723
2724 lockdep_assert_held(&cm_id_priv->lock);
2725
2726 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2727 return -EINVAL;
2728
2729 if (cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2730 trace_icm_send_drep_err(&cm_id_priv->id);
2731 kfree(private_data);
2732 return -EINVAL;
2733 }
2734
2735 cm_set_private_data(cm_id_priv, private_data, private_data_len);
2736 cm_enter_timewait(cm_id_priv);
2737
2738 ret = cm_alloc_msg(cm_id_priv, &msg);
2739 if (ret)
2740 return ret;
2741
2742 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2743 private_data, private_data_len);
2744
2745 trace_icm_send_drep(&cm_id_priv->id);
2746 ret = ib_post_send_mad(msg, NULL);
2747 if (ret) {
2748 cm_free_msg(msg);
2749 return ret;
2750 }
2751 return 0;
2752 }
2753
2754 int ib_send_cm_drep(struct ib_cm_id *cm_id, const void *private_data,
2755 u8 private_data_len)
2756 {
2757 struct cm_id_private *cm_id_priv =
2758 container_of(cm_id, struct cm_id_private, id);
2759 unsigned long flags;
2760 void *data;
2761 int ret;
2762
2763 data = cm_copy_private_data(private_data, private_data_len);
2764 if (IS_ERR(data))
2765 return PTR_ERR(data);
2766
2767 spin_lock_irqsave(&cm_id_priv->lock, flags);
2768 ret = cm_send_drep_locked(cm_id_priv, data, private_data_len);
2769 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2770 return ret;
2771 }
2772 EXPORT_SYMBOL(ib_send_cm_drep);
2773
2774 static int cm_issue_drep(struct cm_port *port,
2775 struct ib_mad_recv_wc *mad_recv_wc)
2776 {
2777 struct ib_mad_send_buf *msg = NULL;
2778 struct cm_dreq_msg *dreq_msg;
2779 struct cm_drep_msg *drep_msg;
2780 int ret;
2781
2782 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2783 if (ret)
2784 return ret;
2785
2786 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2787 drep_msg = (struct cm_drep_msg *) msg->mad;
2788
2789 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2790 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg,
2791 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg));
2792 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg,
2793 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2794
2795 trace_icm_issue_drep(
2796 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg),
2797 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2798 ret = ib_post_send_mad(msg, NULL);
2799 if (ret)
2800 cm_free_msg(msg);
2801
2802 return ret;
2803 }
2804
2805 static int cm_dreq_handler(struct cm_work *work)
2806 {
2807 struct cm_id_private *cm_id_priv;
2808 struct cm_dreq_msg *dreq_msg;
2809 struct ib_mad_send_buf *msg = NULL;
2810
2811 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2812 cm_id_priv = cm_acquire_id(
2813 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)),
2814 cpu_to_be32(IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg)));
2815 if (!cm_id_priv) {
2816 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2817 counter[CM_DREQ_COUNTER]);
2818 cm_issue_drep(work->port, work->mad_recv_wc);
2819 trace_icm_no_priv_err(
2820 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg),
2821 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2822 return -EINVAL;
2823 }
2824
2825 work->cm_event.private_data =
2826 IBA_GET_MEM_PTR(CM_DREQ_PRIVATE_DATA, dreq_msg);
2827
2828 spin_lock_irq(&cm_id_priv->lock);
2829 if (cm_id_priv->local_qpn !=
2830 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg)))
2831 goto unlock;
2832
2833 switch (cm_id_priv->id.state) {
2834 case IB_CM_REP_SENT:
2835 case IB_CM_DREQ_SENT:
2836 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2837 break;
2838 case IB_CM_ESTABLISHED:
2839 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2840 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2841 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2842 break;
2843 case IB_CM_MRA_REP_RCVD:
2844 break;
2845 case IB_CM_TIMEWAIT:
2846 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2847 counter[CM_DREQ_COUNTER]);
2848 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
2849 if (IS_ERR(msg))
2850 goto unlock;
2851
2852 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2853 cm_id_priv->private_data,
2854 cm_id_priv->private_data_len);
2855 spin_unlock_irq(&cm_id_priv->lock);
2856
2857 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
2858 ib_post_send_mad(msg, NULL))
2859 cm_free_msg(msg);
2860 goto deref;
2861 case IB_CM_DREQ_RCVD:
2862 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2863 counter[CM_DREQ_COUNTER]);
2864 goto unlock;
2865 default:
2866 trace_icm_dreq_unknown_err(&cm_id_priv->id);
2867 goto unlock;
2868 }
2869 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2870 cm_id_priv->tid = dreq_msg->hdr.tid;
2871 cm_queue_work_unlock(cm_id_priv, work);
2872 return 0;
2873
2874 unlock: spin_unlock_irq(&cm_id_priv->lock);
2875 deref: cm_deref_id(cm_id_priv);
2876 return -EINVAL;
2877 }
2878
2879 static int cm_drep_handler(struct cm_work *work)
2880 {
2881 struct cm_id_private *cm_id_priv;
2882 struct cm_drep_msg *drep_msg;
2883
2884 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2885 cm_id_priv = cm_acquire_id(
2886 cpu_to_be32(IBA_GET(CM_DREP_REMOTE_COMM_ID, drep_msg)),
2887 cpu_to_be32(IBA_GET(CM_DREP_LOCAL_COMM_ID, drep_msg)));
2888 if (!cm_id_priv)
2889 return -EINVAL;
2890
2891 work->cm_event.private_data =
2892 IBA_GET_MEM_PTR(CM_DREP_PRIVATE_DATA, drep_msg);
2893
2894 spin_lock_irq(&cm_id_priv->lock);
2895 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2896 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2897 spin_unlock_irq(&cm_id_priv->lock);
2898 goto out;
2899 }
2900 cm_enter_timewait(cm_id_priv);
2901
2902 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2903 cm_queue_work_unlock(cm_id_priv, work);
2904 return 0;
2905 out:
2906 cm_deref_id(cm_id_priv);
2907 return -EINVAL;
2908 }
2909
2910 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv,
2911 enum ib_cm_rej_reason reason, void *ari,
2912 u8 ari_length, const void *private_data,
2913 u8 private_data_len)
2914 {
2915 enum ib_cm_state state = cm_id_priv->id.state;
2916 struct ib_mad_send_buf *msg;
2917 int ret;
2918
2919 lockdep_assert_held(&cm_id_priv->lock);
2920
2921 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2922 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2923 return -EINVAL;
2924
2925 switch (state) {
2926 case IB_CM_REQ_SENT:
2927 case IB_CM_MRA_REQ_RCVD:
2928 case IB_CM_REQ_RCVD:
2929 case IB_CM_MRA_REQ_SENT:
2930 case IB_CM_REP_RCVD:
2931 case IB_CM_MRA_REP_SENT:
2932 cm_reset_to_idle(cm_id_priv);
2933 ret = cm_alloc_msg(cm_id_priv, &msg);
2934 if (ret)
2935 return ret;
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 case IB_CM_REP_SENT:
2941 case IB_CM_MRA_REP_RCVD:
2942 cm_enter_timewait(cm_id_priv);
2943 ret = cm_alloc_msg(cm_id_priv, &msg);
2944 if (ret)
2945 return ret;
2946 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason,
2947 ari, ari_length, private_data, private_data_len,
2948 state);
2949 break;
2950 default:
2951 trace_icm_send_unknown_rej_err(&cm_id_priv->id);
2952 return -EINVAL;
2953 }
2954
2955 trace_icm_send_rej(&cm_id_priv->id, reason);
2956 ret = ib_post_send_mad(msg, NULL);
2957 if (ret) {
2958 cm_free_msg(msg);
2959 return ret;
2960 }
2961
2962 return 0;
2963 }
2964
2965 int ib_send_cm_rej(struct ib_cm_id *cm_id, enum ib_cm_rej_reason reason,
2966 void *ari, u8 ari_length, const void *private_data,
2967 u8 private_data_len)
2968 {
2969 struct cm_id_private *cm_id_priv =
2970 container_of(cm_id, struct cm_id_private, id);
2971 unsigned long flags;
2972 int ret;
2973
2974 spin_lock_irqsave(&cm_id_priv->lock, flags);
2975 ret = cm_send_rej_locked(cm_id_priv, reason, ari, ari_length,
2976 private_data, private_data_len);
2977 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2978 return ret;
2979 }
2980 EXPORT_SYMBOL(ib_send_cm_rej);
2981
2982 static void cm_format_rej_event(struct cm_work *work)
2983 {
2984 struct cm_rej_msg *rej_msg;
2985 struct ib_cm_rej_event_param *param;
2986
2987 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2988 param = &work->cm_event.param.rej_rcvd;
2989 param->ari = IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg);
2990 param->ari_length = IBA_GET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg);
2991 param->reason = IBA_GET(CM_REJ_REASON, rej_msg);
2992 work->cm_event.private_data =
2993 IBA_GET_MEM_PTR(CM_REJ_PRIVATE_DATA, rej_msg);
2994 }
2995
2996 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2997 {
2998 struct cm_id_private *cm_id_priv;
2999 __be32 remote_id;
3000
3001 remote_id = cpu_to_be32(IBA_GET(CM_REJ_LOCAL_COMM_ID, rej_msg));
3002
3003 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_TIMEOUT) {
3004 cm_id_priv = cm_find_remote_id(
3005 *((__be64 *)IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg)),
3006 remote_id);
3007 } else if (IBA_GET(CM_REJ_MESSAGE_REJECTED, rej_msg) ==
3008 CM_MSG_RESPONSE_REQ)
3009 cm_id_priv = cm_acquire_id(
3010 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)),
3011 0);
3012 else
3013 cm_id_priv = cm_acquire_id(
3014 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)),
3015 remote_id);
3016
3017 return cm_id_priv;
3018 }
3019
3020 static int cm_rej_handler(struct cm_work *work)
3021 {
3022 struct cm_id_private *cm_id_priv;
3023 struct cm_rej_msg *rej_msg;
3024
3025 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
3026 cm_id_priv = cm_acquire_rejected_id(rej_msg);
3027 if (!cm_id_priv)
3028 return -EINVAL;
3029
3030 cm_format_rej_event(work);
3031
3032 spin_lock_irq(&cm_id_priv->lock);
3033 switch (cm_id_priv->id.state) {
3034 case IB_CM_REQ_SENT:
3035 case IB_CM_MRA_REQ_RCVD:
3036 case IB_CM_REP_SENT:
3037 case IB_CM_MRA_REP_RCVD:
3038 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3039 fallthrough;
3040 case IB_CM_REQ_RCVD:
3041 case IB_CM_MRA_REQ_SENT:
3042 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_STALE_CONN)
3043 cm_enter_timewait(cm_id_priv);
3044 else
3045 cm_reset_to_idle(cm_id_priv);
3046 break;
3047 case IB_CM_DREQ_SENT:
3048 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3049 fallthrough;
3050 case IB_CM_REP_RCVD:
3051 case IB_CM_MRA_REP_SENT:
3052 cm_enter_timewait(cm_id_priv);
3053 break;
3054 case IB_CM_ESTABLISHED:
3055 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
3056 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
3057 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
3058 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
3059 cm_id_priv->msg);
3060 cm_enter_timewait(cm_id_priv);
3061 break;
3062 }
3063 fallthrough;
3064 default:
3065 trace_icm_rej_unknown_err(&cm_id_priv->id);
3066 spin_unlock_irq(&cm_id_priv->lock);
3067 goto out;
3068 }
3069
3070 cm_queue_work_unlock(cm_id_priv, work);
3071 return 0;
3072 out:
3073 cm_deref_id(cm_id_priv);
3074 return -EINVAL;
3075 }
3076
3077 int ib_send_cm_mra(struct ib_cm_id *cm_id,
3078 u8 service_timeout,
3079 const void *private_data,
3080 u8 private_data_len)
3081 {
3082 struct cm_id_private *cm_id_priv;
3083 struct ib_mad_send_buf *msg;
3084 enum ib_cm_state cm_state;
3085 enum ib_cm_lap_state lap_state;
3086 enum cm_msg_response msg_response;
3087 void *data;
3088 unsigned long flags;
3089 int ret;
3090
3091 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
3092 return -EINVAL;
3093
3094 data = cm_copy_private_data(private_data, private_data_len);
3095 if (IS_ERR(data))
3096 return PTR_ERR(data);
3097
3098 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3099
3100 spin_lock_irqsave(&cm_id_priv->lock, flags);
3101 switch(cm_id_priv->id.state) {
3102 case IB_CM_REQ_RCVD:
3103 cm_state = IB_CM_MRA_REQ_SENT;
3104 lap_state = cm_id->lap_state;
3105 msg_response = CM_MSG_RESPONSE_REQ;
3106 break;
3107 case IB_CM_REP_RCVD:
3108 cm_state = IB_CM_MRA_REP_SENT;
3109 lap_state = cm_id->lap_state;
3110 msg_response = CM_MSG_RESPONSE_REP;
3111 break;
3112 case IB_CM_ESTABLISHED:
3113 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
3114 cm_state = cm_id->state;
3115 lap_state = IB_CM_MRA_LAP_SENT;
3116 msg_response = CM_MSG_RESPONSE_OTHER;
3117 break;
3118 }
3119 fallthrough;
3120 default:
3121 trace_icm_send_mra_unknown_err(&cm_id_priv->id);
3122 ret = -EINVAL;
3123 goto error1;
3124 }
3125
3126 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
3127 ret = cm_alloc_msg(cm_id_priv, &msg);
3128 if (ret)
3129 goto error1;
3130
3131 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
3132 msg_response, service_timeout,
3133 private_data, private_data_len);
3134 trace_icm_send_mra(cm_id);
3135 ret = ib_post_send_mad(msg, NULL);
3136 if (ret)
3137 goto error2;
3138 }
3139
3140 cm_id->state = cm_state;
3141 cm_id->lap_state = lap_state;
3142 cm_id_priv->service_timeout = service_timeout;
3143 cm_set_private_data(cm_id_priv, data, private_data_len);
3144 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3145 return 0;
3146
3147 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3148 kfree(data);
3149 return ret;
3150
3151 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3152 kfree(data);
3153 cm_free_msg(msg);
3154 return ret;
3155 }
3156 EXPORT_SYMBOL(ib_send_cm_mra);
3157
3158 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
3159 {
3160 switch (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg)) {
3161 case CM_MSG_RESPONSE_REQ:
3162 return cm_acquire_id(
3163 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)),
3164 0);
3165 case CM_MSG_RESPONSE_REP:
3166 case CM_MSG_RESPONSE_OTHER:
3167 return cm_acquire_id(
3168 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)),
3169 cpu_to_be32(IBA_GET(CM_MRA_LOCAL_COMM_ID, mra_msg)));
3170 default:
3171 return NULL;
3172 }
3173 }
3174
3175 static int cm_mra_handler(struct cm_work *work)
3176 {
3177 struct cm_id_private *cm_id_priv;
3178 struct cm_mra_msg *mra_msg;
3179 int timeout;
3180
3181 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
3182 cm_id_priv = cm_acquire_mraed_id(mra_msg);
3183 if (!cm_id_priv)
3184 return -EINVAL;
3185
3186 work->cm_event.private_data =
3187 IBA_GET_MEM_PTR(CM_MRA_PRIVATE_DATA, mra_msg);
3188 work->cm_event.param.mra_rcvd.service_timeout =
3189 IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg);
3190 timeout = cm_convert_to_ms(IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg)) +
3191 cm_convert_to_ms(cm_id_priv->av.timeout);
3192
3193 spin_lock_irq(&cm_id_priv->lock);
3194 switch (cm_id_priv->id.state) {
3195 case IB_CM_REQ_SENT:
3196 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3197 CM_MSG_RESPONSE_REQ ||
3198 ib_modify_mad(cm_id_priv->av.port->mad_agent,
3199 cm_id_priv->msg, timeout))
3200 goto out;
3201 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
3202 break;
3203 case IB_CM_REP_SENT:
3204 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3205 CM_MSG_RESPONSE_REP ||
3206 ib_modify_mad(cm_id_priv->av.port->mad_agent,
3207 cm_id_priv->msg, timeout))
3208 goto out;
3209 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
3210 break;
3211 case IB_CM_ESTABLISHED:
3212 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3213 CM_MSG_RESPONSE_OTHER ||
3214 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
3215 ib_modify_mad(cm_id_priv->av.port->mad_agent,
3216 cm_id_priv->msg, timeout)) {
3217 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
3218 atomic_long_inc(&work->port->
3219 counter_group[CM_RECV_DUPLICATES].
3220 counter[CM_MRA_COUNTER]);
3221 goto out;
3222 }
3223 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
3224 break;
3225 case IB_CM_MRA_REQ_RCVD:
3226 case IB_CM_MRA_REP_RCVD:
3227 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3228 counter[CM_MRA_COUNTER]);
3229 fallthrough;
3230 default:
3231 trace_icm_mra_unknown_err(&cm_id_priv->id);
3232 goto out;
3233 }
3234
3235 cm_id_priv->msg->context[1] = (void *) (unsigned long)
3236 cm_id_priv->id.state;
3237 cm_queue_work_unlock(cm_id_priv, work);
3238 return 0;
3239 out:
3240 spin_unlock_irq(&cm_id_priv->lock);
3241 cm_deref_id(cm_id_priv);
3242 return -EINVAL;
3243 }
3244
3245 static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg,
3246 struct sa_path_rec *path)
3247 {
3248 u32 lid;
3249
3250 if (path->rec_type != SA_PATH_REC_TYPE_OPA) {
3251 sa_path_set_dlid(path, IBA_GET(CM_LAP_ALTERNATE_LOCAL_PORT_LID,
3252 lap_msg));
3253 sa_path_set_slid(path, IBA_GET(CM_LAP_ALTERNATE_REMOTE_PORT_LID,
3254 lap_msg));
3255 } else {
3256 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
3257 CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg));
3258 sa_path_set_dlid(path, lid);
3259
3260 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
3261 CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg));
3262 sa_path_set_slid(path, lid);
3263 }
3264 }
3265
3266 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
3267 struct sa_path_rec *path,
3268 struct cm_lap_msg *lap_msg)
3269 {
3270 path->dgid = *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg);
3271 path->sgid =
3272 *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg);
3273 path->flow_label =
3274 cpu_to_be32(IBA_GET(CM_LAP_ALTERNATE_FLOW_LABEL, lap_msg));
3275 path->hop_limit = IBA_GET(CM_LAP_ALTERNATE_HOP_LIMIT, lap_msg);
3276 path->traffic_class = IBA_GET(CM_LAP_ALTERNATE_TRAFFIC_CLASS, lap_msg);
3277 path->reversible = 1;
3278 path->pkey = cm_id_priv->pkey;
3279 path->sl = IBA_GET(CM_LAP_ALTERNATE_SL, lap_msg);
3280 path->mtu_selector = IB_SA_EQ;
3281 path->mtu = cm_id_priv->path_mtu;
3282 path->rate_selector = IB_SA_EQ;
3283 path->rate = IBA_GET(CM_LAP_ALTERNATE_PACKET_RATE, lap_msg);
3284 path->packet_life_time_selector = IB_SA_EQ;
3285 path->packet_life_time =
3286 IBA_GET(CM_LAP_ALTERNATE_LOCAL_ACK_TIMEOUT, lap_msg);
3287 path->packet_life_time -= (path->packet_life_time > 0);
3288 cm_format_path_lid_from_lap(lap_msg, path);
3289 }
3290
3291 static int cm_lap_handler(struct cm_work *work)
3292 {
3293 struct cm_id_private *cm_id_priv;
3294 struct cm_lap_msg *lap_msg;
3295 struct ib_cm_lap_event_param *param;
3296 struct ib_mad_send_buf *msg = NULL;
3297 int ret;
3298
3299 /* Currently Alternate path messages are not supported for
3300 * RoCE link layer.
3301 */
3302 if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3303 work->port->port_num))
3304 return -EINVAL;
3305
3306 /* todo: verify LAP request and send reject APR if invalid. */
3307 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
3308 cm_id_priv = cm_acquire_id(
3309 cpu_to_be32(IBA_GET(CM_LAP_REMOTE_COMM_ID, lap_msg)),
3310 cpu_to_be32(IBA_GET(CM_LAP_LOCAL_COMM_ID, lap_msg)));
3311 if (!cm_id_priv)
3312 return -EINVAL;
3313
3314 param = &work->cm_event.param.lap_rcvd;
3315 memset(&work->path[0], 0, sizeof(work->path[1]));
3316 cm_path_set_rec_type(work->port->cm_dev->ib_device,
3317 work->port->port_num, &work->path[0],
3318 IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID,
3319 lap_msg));
3320 param->alternate_path = &work->path[0];
3321 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
3322 work->cm_event.private_data =
3323 IBA_GET_MEM_PTR(CM_LAP_PRIVATE_DATA, lap_msg);
3324
3325 spin_lock_irq(&cm_id_priv->lock);
3326 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
3327 goto unlock;
3328
3329 switch (cm_id_priv->id.lap_state) {
3330 case IB_CM_LAP_UNINIT:
3331 case IB_CM_LAP_IDLE:
3332 break;
3333 case IB_CM_MRA_LAP_SENT:
3334 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3335 counter[CM_LAP_COUNTER]);
3336 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
3337 if (IS_ERR(msg))
3338 goto unlock;
3339
3340 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
3341 CM_MSG_RESPONSE_OTHER,
3342 cm_id_priv->service_timeout,
3343 cm_id_priv->private_data,
3344 cm_id_priv->private_data_len);
3345 spin_unlock_irq(&cm_id_priv->lock);
3346
3347 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
3348 ib_post_send_mad(msg, NULL))
3349 cm_free_msg(msg);
3350 goto deref;
3351 case IB_CM_LAP_RCVD:
3352 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3353 counter[CM_LAP_COUNTER]);
3354 goto unlock;
3355 default:
3356 goto unlock;
3357 }
3358
3359 ret = cm_init_av_for_lap(work->port, work->mad_recv_wc->wc,
3360 work->mad_recv_wc->recv_buf.grh,
3361 &cm_id_priv->av);
3362 if (ret)
3363 goto unlock;
3364
3365 ret = cm_init_av_by_path(param->alternate_path, NULL,
3366 &cm_id_priv->alt_av, cm_id_priv);
3367 if (ret)
3368 goto unlock;
3369
3370 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
3371 cm_id_priv->tid = lap_msg->hdr.tid;
3372 cm_queue_work_unlock(cm_id_priv, work);
3373 return 0;
3374
3375 unlock: spin_unlock_irq(&cm_id_priv->lock);
3376 deref: cm_deref_id(cm_id_priv);
3377 return -EINVAL;
3378 }
3379
3380 static int cm_apr_handler(struct cm_work *work)
3381 {
3382 struct cm_id_private *cm_id_priv;
3383 struct cm_apr_msg *apr_msg;
3384
3385 /* Currently Alternate path messages are not supported for
3386 * RoCE link layer.
3387 */
3388 if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3389 work->port->port_num))
3390 return -EINVAL;
3391
3392 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
3393 cm_id_priv = cm_acquire_id(
3394 cpu_to_be32(IBA_GET(CM_APR_REMOTE_COMM_ID, apr_msg)),
3395 cpu_to_be32(IBA_GET(CM_APR_LOCAL_COMM_ID, apr_msg)));
3396 if (!cm_id_priv)
3397 return -EINVAL; /* Unmatched reply. */
3398
3399 work->cm_event.param.apr_rcvd.ap_status =
3400 IBA_GET(CM_APR_AR_STATUS, apr_msg);
3401 work->cm_event.param.apr_rcvd.apr_info =
3402 IBA_GET_MEM_PTR(CM_APR_ADDITIONAL_INFORMATION, apr_msg);
3403 work->cm_event.param.apr_rcvd.info_len =
3404 IBA_GET(CM_APR_ADDITIONAL_INFORMATION_LENGTH, apr_msg);
3405 work->cm_event.private_data =
3406 IBA_GET_MEM_PTR(CM_APR_PRIVATE_DATA, apr_msg);
3407
3408 spin_lock_irq(&cm_id_priv->lock);
3409 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
3410 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
3411 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
3412 spin_unlock_irq(&cm_id_priv->lock);
3413 goto out;
3414 }
3415 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
3416 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3417 cm_id_priv->msg = NULL;
3418 cm_queue_work_unlock(cm_id_priv, work);
3419 return 0;
3420 out:
3421 cm_deref_id(cm_id_priv);
3422 return -EINVAL;
3423 }
3424
3425 static int cm_timewait_handler(struct cm_work *work)
3426 {
3427 struct cm_timewait_info *timewait_info;
3428 struct cm_id_private *cm_id_priv;
3429
3430 timewait_info = container_of(work, struct cm_timewait_info, work);
3431 spin_lock_irq(&cm.lock);
3432 list_del(&timewait_info->list);
3433 spin_unlock_irq(&cm.lock);
3434
3435 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
3436 timewait_info->work.remote_id);
3437 if (!cm_id_priv)
3438 return -EINVAL;
3439
3440 spin_lock_irq(&cm_id_priv->lock);
3441 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
3442 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
3443 spin_unlock_irq(&cm_id_priv->lock);
3444 goto out;
3445 }
3446 cm_id_priv->id.state = IB_CM_IDLE;
3447 cm_queue_work_unlock(cm_id_priv, work);
3448 return 0;
3449 out:
3450 cm_deref_id(cm_id_priv);
3451 return -EINVAL;
3452 }
3453
3454 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
3455 struct cm_id_private *cm_id_priv,
3456 struct ib_cm_sidr_req_param *param)
3457 {
3458 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
3459 cm_form_tid(cm_id_priv));
3460 IBA_SET(CM_SIDR_REQ_REQUESTID, sidr_req_msg,
3461 be32_to_cpu(cm_id_priv->id.local_id));
3462 IBA_SET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg,
3463 be16_to_cpu(param->path->pkey));
3464 IBA_SET(CM_SIDR_REQ_SERVICEID, sidr_req_msg,
3465 be64_to_cpu(param->service_id));
3466
3467 if (param->private_data && param->private_data_len)
3468 IBA_SET_MEM(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg,
3469 param->private_data, param->private_data_len);
3470 }
3471
3472 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
3473 struct ib_cm_sidr_req_param *param)
3474 {
3475 struct cm_id_private *cm_id_priv;
3476 struct ib_mad_send_buf *msg;
3477 unsigned long flags;
3478 int ret;
3479
3480 if (!param->path || (param->private_data &&
3481 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
3482 return -EINVAL;
3483
3484 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3485 ret = cm_init_av_by_path(param->path, param->sgid_attr,
3486 &cm_id_priv->av,
3487 cm_id_priv);
3488 if (ret)
3489 goto out;
3490
3491 cm_id->service_id = param->service_id;
3492 cm_id->service_mask = ~cpu_to_be64(0);
3493 cm_id_priv->timeout_ms = param->timeout_ms;
3494 cm_id_priv->max_cm_retries = param->max_cm_retries;
3495 ret = cm_alloc_msg(cm_id_priv, &msg);
3496 if (ret)
3497 goto out;
3498
3499 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
3500 param);
3501 msg->timeout_ms = cm_id_priv->timeout_ms;
3502 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
3503
3504 spin_lock_irqsave(&cm_id_priv->lock, flags);
3505 if (cm_id->state == IB_CM_IDLE) {
3506 trace_icm_send_sidr_req(&cm_id_priv->id);
3507 ret = ib_post_send_mad(msg, NULL);
3508 } else {
3509 ret = -EINVAL;
3510 }
3511
3512 if (ret) {
3513 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3514 cm_free_msg(msg);
3515 goto out;
3516 }
3517 cm_id->state = IB_CM_SIDR_REQ_SENT;
3518 cm_id_priv->msg = msg;
3519 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3520 out:
3521 return ret;
3522 }
3523 EXPORT_SYMBOL(ib_send_cm_sidr_req);
3524
3525 static void cm_format_sidr_req_event(struct cm_work *work,
3526 const struct cm_id_private *rx_cm_id,
3527 struct ib_cm_id *listen_id)
3528 {
3529 struct cm_sidr_req_msg *sidr_req_msg;
3530 struct ib_cm_sidr_req_event_param *param;
3531
3532 sidr_req_msg = (struct cm_sidr_req_msg *)
3533 work->mad_recv_wc->recv_buf.mad;
3534 param = &work->cm_event.param.sidr_req_rcvd;
3535 param->pkey = IBA_GET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg);
3536 param->listen_id = listen_id;
3537 param->service_id =
3538 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg));
3539 param->bth_pkey = cm_get_bth_pkey(work);
3540 param->port = work->port->port_num;
3541 param->sgid_attr = rx_cm_id->av.ah_attr.grh.sgid_attr;
3542 work->cm_event.private_data =
3543 IBA_GET_MEM_PTR(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg);
3544 }
3545
3546 static int cm_sidr_req_handler(struct cm_work *work)
3547 {
3548 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
3549 struct cm_sidr_req_msg *sidr_req_msg;
3550 struct ib_wc *wc;
3551 int ret;
3552
3553 cm_id_priv =
3554 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL);
3555 if (IS_ERR(cm_id_priv))
3556 return PTR_ERR(cm_id_priv);
3557
3558 /* Record SGID/SLID and request ID for lookup. */
3559 sidr_req_msg = (struct cm_sidr_req_msg *)
3560 work->mad_recv_wc->recv_buf.mad;
3561
3562 cm_id_priv->id.remote_id =
3563 cpu_to_be32(IBA_GET(CM_SIDR_REQ_REQUESTID, sidr_req_msg));
3564 cm_id_priv->id.service_id =
3565 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg));
3566 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3567 cm_id_priv->tid = sidr_req_msg->hdr.tid;
3568
3569 wc = work->mad_recv_wc->wc;
3570 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
3571 cm_id_priv->av.dgid.global.interface_id = 0;
3572 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
3573 work->mad_recv_wc->recv_buf.grh,
3574 &cm_id_priv->av);
3575 if (ret)
3576 goto out;
3577
3578 spin_lock_irq(&cm.lock);
3579 listen_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3580 if (listen_cm_id_priv) {
3581 spin_unlock_irq(&cm.lock);
3582 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3583 counter[CM_SIDR_REQ_COUNTER]);
3584 goto out; /* Duplicate message. */
3585 }
3586 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3587 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
3588 cm_id_priv->id.service_id);
3589 if (!listen_cm_id_priv) {
3590 spin_unlock_irq(&cm.lock);
3591 ib_send_cm_sidr_rep(&cm_id_priv->id,
3592 &(struct ib_cm_sidr_rep_param){
3593 .status = IB_SIDR_UNSUPPORTED });
3594 goto out; /* No match. */
3595 }
3596 spin_unlock_irq(&cm.lock);
3597
3598 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
3599 cm_id_priv->id.context = listen_cm_id_priv->id.context;
3600
3601 /*
3602 * A SIDR ID does not need to be in the xarray since it does not receive
3603 * mads, is not placed in the remote_id or remote_qpn rbtree, and does
3604 * not enter timewait.
3605 */
3606
3607 cm_format_sidr_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
3608 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
3609 cm_free_work(work);
3610 /*
3611 * A pointer to the listen_cm_id is held in the event, so this deref
3612 * must be after the event is delivered above.
3613 */
3614 cm_deref_id(listen_cm_id_priv);
3615 if (ret)
3616 cm_destroy_id(&cm_id_priv->id, ret);
3617 return 0;
3618 out:
3619 ib_destroy_cm_id(&cm_id_priv->id);
3620 return -EINVAL;
3621 }
3622
3623 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3624 struct cm_id_private *cm_id_priv,
3625 struct ib_cm_sidr_rep_param *param)
3626 {
3627 cm_format_mad_ece_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3628 cm_id_priv->tid, param->ece.attr_mod);
3629 IBA_SET(CM_SIDR_REP_REQUESTID, sidr_rep_msg,
3630 be32_to_cpu(cm_id_priv->id.remote_id));
3631 IBA_SET(CM_SIDR_REP_STATUS, sidr_rep_msg, param->status);
3632 IBA_SET(CM_SIDR_REP_QPN, sidr_rep_msg, param->qp_num);
3633 IBA_SET(CM_SIDR_REP_SERVICEID, sidr_rep_msg,
3634 be64_to_cpu(cm_id_priv->id.service_id));
3635 IBA_SET(CM_SIDR_REP_Q_KEY, sidr_rep_msg, param->qkey);
3636 IBA_SET(CM_SIDR_REP_VENDOR_ID_L, sidr_rep_msg,
3637 param->ece.vendor_id & 0xFF);
3638 IBA_SET(CM_SIDR_REP_VENDOR_ID_H, sidr_rep_msg,
3639 (param->ece.vendor_id >> 8) & 0xFF);
3640
3641 if (param->info && param->info_length)
3642 IBA_SET_MEM(CM_SIDR_REP_ADDITIONAL_INFORMATION, sidr_rep_msg,
3643 param->info, param->info_length);
3644
3645 if (param->private_data && param->private_data_len)
3646 IBA_SET_MEM(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg,
3647 param->private_data, param->private_data_len);
3648 }
3649
3650 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv,
3651 struct ib_cm_sidr_rep_param *param)
3652 {
3653 struct ib_mad_send_buf *msg;
3654 int ret;
3655
3656 lockdep_assert_held(&cm_id_priv->lock);
3657
3658 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3659 (param->private_data &&
3660 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3661 return -EINVAL;
3662
3663 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_RCVD)
3664 return -EINVAL;
3665
3666 ret = cm_alloc_msg(cm_id_priv, &msg);
3667 if (ret)
3668 return ret;
3669
3670 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3671 param);
3672 trace_icm_send_sidr_rep(&cm_id_priv->id);
3673 ret = ib_post_send_mad(msg, NULL);
3674 if (ret) {
3675 cm_free_msg(msg);
3676 return ret;
3677 }
3678 cm_id_priv->id.state = IB_CM_IDLE;
3679 spin_lock_irq(&cm.lock);
3680 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) {
3681 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3682 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
3683 }
3684 spin_unlock_irq(&cm.lock);
3685 return 0;
3686 }
3687
3688 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3689 struct ib_cm_sidr_rep_param *param)
3690 {
3691 struct cm_id_private *cm_id_priv =
3692 container_of(cm_id, struct cm_id_private, id);
3693 unsigned long flags;
3694 int ret;
3695
3696 spin_lock_irqsave(&cm_id_priv->lock, flags);
3697 ret = cm_send_sidr_rep_locked(cm_id_priv, param);
3698 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3699 return ret;
3700 }
3701 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3702
3703 static void cm_format_sidr_rep_event(struct cm_work *work,
3704 const struct cm_id_private *cm_id_priv)
3705 {
3706 struct cm_sidr_rep_msg *sidr_rep_msg;
3707 struct ib_cm_sidr_rep_event_param *param;
3708
3709 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3710 work->mad_recv_wc->recv_buf.mad;
3711 param = &work->cm_event.param.sidr_rep_rcvd;
3712 param->status = IBA_GET(CM_SIDR_REP_STATUS, sidr_rep_msg);
3713 param->qkey = IBA_GET(CM_SIDR_REP_Q_KEY, sidr_rep_msg);
3714 param->qpn = IBA_GET(CM_SIDR_REP_QPN, sidr_rep_msg);
3715 param->info = IBA_GET_MEM_PTR(CM_SIDR_REP_ADDITIONAL_INFORMATION,
3716 sidr_rep_msg);
3717 param->info_len = IBA_GET(CM_SIDR_REP_ADDITIONAL_INFORMATION_LENGTH,
3718 sidr_rep_msg);
3719 param->sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
3720 work->cm_event.private_data =
3721 IBA_GET_MEM_PTR(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg);
3722 }
3723
3724 static int cm_sidr_rep_handler(struct cm_work *work)
3725 {
3726 struct cm_sidr_rep_msg *sidr_rep_msg;
3727 struct cm_id_private *cm_id_priv;
3728
3729 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3730 work->mad_recv_wc->recv_buf.mad;
3731 cm_id_priv = cm_acquire_id(
3732 cpu_to_be32(IBA_GET(CM_SIDR_REP_REQUESTID, sidr_rep_msg)), 0);
3733 if (!cm_id_priv)
3734 return -EINVAL; /* Unmatched reply. */
3735
3736 spin_lock_irq(&cm_id_priv->lock);
3737 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3738 spin_unlock_irq(&cm_id_priv->lock);
3739 goto out;
3740 }
3741 cm_id_priv->id.state = IB_CM_IDLE;
3742 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3743 spin_unlock_irq(&cm_id_priv->lock);
3744
3745 cm_format_sidr_rep_event(work, cm_id_priv);
3746 cm_process_work(cm_id_priv, work);
3747 return 0;
3748 out:
3749 cm_deref_id(cm_id_priv);
3750 return -EINVAL;
3751 }
3752
3753 static void cm_process_send_error(struct ib_mad_send_buf *msg,
3754 enum ib_wc_status wc_status)
3755 {
3756 struct cm_id_private *cm_id_priv;
3757 struct ib_cm_event cm_event;
3758 enum ib_cm_state state;
3759 int ret;
3760
3761 memset(&cm_event, 0, sizeof cm_event);
3762 cm_id_priv = msg->context[0];
3763
3764 /* Discard old sends or ones without a response. */
3765 spin_lock_irq(&cm_id_priv->lock);
3766 state = (enum ib_cm_state) (unsigned long) msg->context[1];
3767 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3768 goto discard;
3769
3770 trace_icm_mad_send_err(state, wc_status);
3771 switch (state) {
3772 case IB_CM_REQ_SENT:
3773 case IB_CM_MRA_REQ_RCVD:
3774 cm_reset_to_idle(cm_id_priv);
3775 cm_event.event = IB_CM_REQ_ERROR;
3776 break;
3777 case IB_CM_REP_SENT:
3778 case IB_CM_MRA_REP_RCVD:
3779 cm_reset_to_idle(cm_id_priv);
3780 cm_event.event = IB_CM_REP_ERROR;
3781 break;
3782 case IB_CM_DREQ_SENT:
3783 cm_enter_timewait(cm_id_priv);
3784 cm_event.event = IB_CM_DREQ_ERROR;
3785 break;
3786 case IB_CM_SIDR_REQ_SENT:
3787 cm_id_priv->id.state = IB_CM_IDLE;
3788 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3789 break;
3790 default:
3791 goto discard;
3792 }
3793 spin_unlock_irq(&cm_id_priv->lock);
3794 cm_event.param.send_status = wc_status;
3795
3796 /* No other events can occur on the cm_id at this point. */
3797 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3798 cm_free_msg(msg);
3799 if (ret)
3800 ib_destroy_cm_id(&cm_id_priv->id);
3801 return;
3802 discard:
3803 spin_unlock_irq(&cm_id_priv->lock);
3804 cm_free_msg(msg);
3805 }
3806
3807 static void cm_send_handler(struct ib_mad_agent *mad_agent,
3808 struct ib_mad_send_wc *mad_send_wc)
3809 {
3810 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3811 struct cm_port *port;
3812 u16 attr_index;
3813
3814 port = mad_agent->context;
3815 attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3816 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3817
3818 /*
3819 * If the send was in response to a received message (context[0] is not
3820 * set to a cm_id), and is not a REJ, then it is a send that was
3821 * manually retried.
3822 */
3823 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3824 msg->retries = 1;
3825
3826 atomic_long_add(1 + msg->retries,
3827 &port->counter_group[CM_XMIT].counter[attr_index]);
3828 if (msg->retries)
3829 atomic_long_add(msg->retries,
3830 &port->counter_group[CM_XMIT_RETRIES].
3831 counter[attr_index]);
3832
3833 switch (mad_send_wc->status) {
3834 case IB_WC_SUCCESS:
3835 case IB_WC_WR_FLUSH_ERR:
3836 cm_free_msg(msg);
3837 break;
3838 default:
3839 if (msg->context[0] && msg->context[1])
3840 cm_process_send_error(msg, mad_send_wc->status);
3841 else
3842 cm_free_msg(msg);
3843 break;
3844 }
3845 }
3846
3847 static void cm_work_handler(struct work_struct *_work)
3848 {
3849 struct cm_work *work = container_of(_work, struct cm_work, work.work);
3850 int ret;
3851
3852 switch (work->cm_event.event) {
3853 case IB_CM_REQ_RECEIVED:
3854 ret = cm_req_handler(work);
3855 break;
3856 case IB_CM_MRA_RECEIVED:
3857 ret = cm_mra_handler(work);
3858 break;
3859 case IB_CM_REJ_RECEIVED:
3860 ret = cm_rej_handler(work);
3861 break;
3862 case IB_CM_REP_RECEIVED:
3863 ret = cm_rep_handler(work);
3864 break;
3865 case IB_CM_RTU_RECEIVED:
3866 ret = cm_rtu_handler(work);
3867 break;
3868 case IB_CM_USER_ESTABLISHED:
3869 ret = cm_establish_handler(work);
3870 break;
3871 case IB_CM_DREQ_RECEIVED:
3872 ret = cm_dreq_handler(work);
3873 break;
3874 case IB_CM_DREP_RECEIVED:
3875 ret = cm_drep_handler(work);
3876 break;
3877 case IB_CM_SIDR_REQ_RECEIVED:
3878 ret = cm_sidr_req_handler(work);
3879 break;
3880 case IB_CM_SIDR_REP_RECEIVED:
3881 ret = cm_sidr_rep_handler(work);
3882 break;
3883 case IB_CM_LAP_RECEIVED:
3884 ret = cm_lap_handler(work);
3885 break;
3886 case IB_CM_APR_RECEIVED:
3887 ret = cm_apr_handler(work);
3888 break;
3889 case IB_CM_TIMEWAIT_EXIT:
3890 ret = cm_timewait_handler(work);
3891 break;
3892 default:
3893 trace_icm_handler_err(work->cm_event.event);
3894 ret = -EINVAL;
3895 break;
3896 }
3897 if (ret)
3898 cm_free_work(work);
3899 }
3900
3901 static int cm_establish(struct ib_cm_id *cm_id)
3902 {
3903 struct cm_id_private *cm_id_priv;
3904 struct cm_work *work;
3905 unsigned long flags;
3906 int ret = 0;
3907 struct cm_device *cm_dev;
3908
3909 cm_dev = ib_get_client_data(cm_id->device, &cm_client);
3910 if (!cm_dev)
3911 return -ENODEV;
3912
3913 work = kmalloc(sizeof *work, GFP_ATOMIC);
3914 if (!work)
3915 return -ENOMEM;
3916
3917 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3918 spin_lock_irqsave(&cm_id_priv->lock, flags);
3919 switch (cm_id->state)
3920 {
3921 case IB_CM_REP_SENT:
3922 case IB_CM_MRA_REP_RCVD:
3923 cm_id->state = IB_CM_ESTABLISHED;
3924 break;
3925 case IB_CM_ESTABLISHED:
3926 ret = -EISCONN;
3927 break;
3928 default:
3929 trace_icm_establish_err(cm_id);
3930 ret = -EINVAL;
3931 break;
3932 }
3933 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3934
3935 if (ret) {
3936 kfree(work);
3937 goto out;
3938 }
3939
3940 /*
3941 * The CM worker thread may try to destroy the cm_id before it
3942 * can execute this work item. To prevent potential deadlock,
3943 * we need to find the cm_id once we're in the context of the
3944 * worker thread, rather than holding a reference on it.
3945 */
3946 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3947 work->local_id = cm_id->local_id;
3948 work->remote_id = cm_id->remote_id;
3949 work->mad_recv_wc = NULL;
3950 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3951
3952 /* Check if the device started its remove_one */
3953 spin_lock_irqsave(&cm.lock, flags);
3954 if (!cm_dev->going_down) {
3955 queue_delayed_work(cm.wq, &work->work, 0);
3956 } else {
3957 kfree(work);
3958 ret = -ENODEV;
3959 }
3960 spin_unlock_irqrestore(&cm.lock, flags);
3961
3962 out:
3963 return ret;
3964 }
3965
3966 static int cm_migrate(struct ib_cm_id *cm_id)
3967 {
3968 struct cm_id_private *cm_id_priv;
3969 struct cm_av tmp_av;
3970 unsigned long flags;
3971 int tmp_send_port_not_ready;
3972 int ret = 0;
3973
3974 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3975 spin_lock_irqsave(&cm_id_priv->lock, flags);
3976 if (cm_id->state == IB_CM_ESTABLISHED &&
3977 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3978 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3979 cm_id->lap_state = IB_CM_LAP_IDLE;
3980 /* Swap address vector */
3981 tmp_av = cm_id_priv->av;
3982 cm_id_priv->av = cm_id_priv->alt_av;
3983 cm_id_priv->alt_av = tmp_av;
3984 /* Swap port send ready state */
3985 tmp_send_port_not_ready = cm_id_priv->prim_send_port_not_ready;
3986 cm_id_priv->prim_send_port_not_ready = cm_id_priv->altr_send_port_not_ready;
3987 cm_id_priv->altr_send_port_not_ready = tmp_send_port_not_ready;
3988 } else
3989 ret = -EINVAL;
3990 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3991
3992 return ret;
3993 }
3994
3995 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3996 {
3997 int ret;
3998
3999 switch (event) {
4000 case IB_EVENT_COMM_EST:
4001 ret = cm_establish(cm_id);
4002 break;
4003 case IB_EVENT_PATH_MIG:
4004 ret = cm_migrate(cm_id);
4005 break;
4006 default:
4007 ret = -EINVAL;
4008 }
4009 return ret;
4010 }
4011 EXPORT_SYMBOL(ib_cm_notify);
4012
4013 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
4014 struct ib_mad_send_buf *send_buf,
4015 struct ib_mad_recv_wc *mad_recv_wc)
4016 {
4017 struct cm_port *port = mad_agent->context;
4018 struct cm_work *work;
4019 enum ib_cm_event_type event;
4020 bool alt_path = false;
4021 u16 attr_id;
4022 int paths = 0;
4023 int going_down = 0;
4024
4025 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
4026 case CM_REQ_ATTR_ID:
4027 alt_path = cm_req_has_alt_path((struct cm_req_msg *)
4028 mad_recv_wc->recv_buf.mad);
4029 paths = 1 + (alt_path != 0);
4030 event = IB_CM_REQ_RECEIVED;
4031 break;
4032 case CM_MRA_ATTR_ID:
4033 event = IB_CM_MRA_RECEIVED;
4034 break;
4035 case CM_REJ_ATTR_ID:
4036 event = IB_CM_REJ_RECEIVED;
4037 break;
4038 case CM_REP_ATTR_ID:
4039 event = IB_CM_REP_RECEIVED;
4040 break;
4041 case CM_RTU_ATTR_ID:
4042 event = IB_CM_RTU_RECEIVED;
4043 break;
4044 case CM_DREQ_ATTR_ID:
4045 event = IB_CM_DREQ_RECEIVED;
4046 break;
4047 case CM_DREP_ATTR_ID:
4048 event = IB_CM_DREP_RECEIVED;
4049 break;
4050 case CM_SIDR_REQ_ATTR_ID:
4051 event = IB_CM_SIDR_REQ_RECEIVED;
4052 break;
4053 case CM_SIDR_REP_ATTR_ID:
4054 event = IB_CM_SIDR_REP_RECEIVED;
4055 break;
4056 case CM_LAP_ATTR_ID:
4057 paths = 1;
4058 event = IB_CM_LAP_RECEIVED;
4059 break;
4060 case CM_APR_ATTR_ID:
4061 event = IB_CM_APR_RECEIVED;
4062 break;
4063 default:
4064 ib_free_recv_mad(mad_recv_wc);
4065 return;
4066 }
4067
4068 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
4069 atomic_long_inc(&port->counter_group[CM_RECV].
4070 counter[attr_id - CM_ATTR_ID_OFFSET]);
4071
4072 work = kmalloc(struct_size(work, path, paths), GFP_KERNEL);
4073 if (!work) {
4074 ib_free_recv_mad(mad_recv_wc);
4075 return;
4076 }
4077
4078 INIT_DELAYED_WORK(&work->work, cm_work_handler);
4079 work->cm_event.event = event;
4080 work->mad_recv_wc = mad_recv_wc;
4081 work->port = port;
4082
4083 /* Check if the device started its remove_one */
4084 spin_lock_irq(&cm.lock);
4085 if (!port->cm_dev->going_down)
4086 queue_delayed_work(cm.wq, &work->work, 0);
4087 else
4088 going_down = 1;
4089 spin_unlock_irq(&cm.lock);
4090
4091 if (going_down) {
4092 kfree(work);
4093 ib_free_recv_mad(mad_recv_wc);
4094 }
4095 }
4096
4097 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
4098 struct ib_qp_attr *qp_attr,
4099 int *qp_attr_mask)
4100 {
4101 unsigned long flags;
4102 int ret;
4103
4104 spin_lock_irqsave(&cm_id_priv->lock, flags);
4105 switch (cm_id_priv->id.state) {
4106 case IB_CM_REQ_SENT:
4107 case IB_CM_MRA_REQ_RCVD:
4108 case IB_CM_REQ_RCVD:
4109 case IB_CM_MRA_REQ_SENT:
4110 case IB_CM_REP_RCVD:
4111 case IB_CM_MRA_REP_SENT:
4112 case IB_CM_REP_SENT:
4113 case IB_CM_MRA_REP_RCVD:
4114 case IB_CM_ESTABLISHED:
4115 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
4116 IB_QP_PKEY_INDEX | IB_QP_PORT;
4117 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
4118 if (cm_id_priv->responder_resources)
4119 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
4120 IB_ACCESS_REMOTE_ATOMIC;
4121 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
4122 qp_attr->port_num = cm_id_priv->av.port->port_num;
4123 ret = 0;
4124 break;
4125 default:
4126 trace_icm_qp_init_err(&cm_id_priv->id);
4127 ret = -EINVAL;
4128 break;
4129 }
4130 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4131 return ret;
4132 }
4133
4134 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
4135 struct ib_qp_attr *qp_attr,
4136 int *qp_attr_mask)
4137 {
4138 unsigned long flags;
4139 int ret;
4140
4141 spin_lock_irqsave(&cm_id_priv->lock, flags);
4142 switch (cm_id_priv->id.state) {
4143 case IB_CM_REQ_RCVD:
4144 case IB_CM_MRA_REQ_SENT:
4145 case IB_CM_REP_RCVD:
4146 case IB_CM_MRA_REP_SENT:
4147 case IB_CM_REP_SENT:
4148 case IB_CM_MRA_REP_RCVD:
4149 case IB_CM_ESTABLISHED:
4150 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
4151 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
4152 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
4153 qp_attr->path_mtu = cm_id_priv->path_mtu;
4154 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
4155 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
4156 if (cm_id_priv->qp_type == IB_QPT_RC ||
4157 cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
4158 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
4159 IB_QP_MIN_RNR_TIMER;
4160 qp_attr->max_dest_rd_atomic =
4161 cm_id_priv->responder_resources;
4162 qp_attr->min_rnr_timer = 0;
4163 }
4164 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) {
4165 *qp_attr_mask |= IB_QP_ALT_PATH;
4166 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
4167 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4168 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4169 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4170 }
4171 ret = 0;
4172 break;
4173 default:
4174 trace_icm_qp_rtr_err(&cm_id_priv->id);
4175 ret = -EINVAL;
4176 break;
4177 }
4178 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4179 return ret;
4180 }
4181
4182 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
4183 struct ib_qp_attr *qp_attr,
4184 int *qp_attr_mask)
4185 {
4186 unsigned long flags;
4187 int ret;
4188
4189 spin_lock_irqsave(&cm_id_priv->lock, flags);
4190 switch (cm_id_priv->id.state) {
4191 /* Allow transition to RTS before sending REP */
4192 case IB_CM_REQ_RCVD:
4193 case IB_CM_MRA_REQ_SENT:
4194
4195 case IB_CM_REP_RCVD:
4196 case IB_CM_MRA_REP_SENT:
4197 case IB_CM_REP_SENT:
4198 case IB_CM_MRA_REP_RCVD:
4199 case IB_CM_ESTABLISHED:
4200 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
4201 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
4202 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
4203 switch (cm_id_priv->qp_type) {
4204 case IB_QPT_RC:
4205 case IB_QPT_XRC_INI:
4206 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
4207 IB_QP_MAX_QP_RD_ATOMIC;
4208 qp_attr->retry_cnt = cm_id_priv->retry_count;
4209 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
4210 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
4211 fallthrough;
4212 case IB_QPT_XRC_TGT:
4213 *qp_attr_mask |= IB_QP_TIMEOUT;
4214 qp_attr->timeout = cm_id_priv->av.timeout;
4215 break;
4216 default:
4217 break;
4218 }
4219 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) {
4220 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
4221 qp_attr->path_mig_state = IB_MIG_REARM;
4222 }
4223 } else {
4224 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
4225 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
4226 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4227 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4228 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4229 qp_attr->path_mig_state = IB_MIG_REARM;
4230 }
4231 ret = 0;
4232 break;
4233 default:
4234 trace_icm_qp_rts_err(&cm_id_priv->id);
4235 ret = -EINVAL;
4236 break;
4237 }
4238 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4239 return ret;
4240 }
4241
4242 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
4243 struct ib_qp_attr *qp_attr,
4244 int *qp_attr_mask)
4245 {
4246 struct cm_id_private *cm_id_priv;
4247 int ret;
4248
4249 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
4250 switch (qp_attr->qp_state) {
4251 case IB_QPS_INIT:
4252 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
4253 break;
4254 case IB_QPS_RTR:
4255 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
4256 break;
4257 case IB_QPS_RTS:
4258 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
4259 break;
4260 default:
4261 ret = -EINVAL;
4262 break;
4263 }
4264 return ret;
4265 }
4266 EXPORT_SYMBOL(ib_cm_init_qp_attr);
4267
4268 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
4269 char *buf)
4270 {
4271 struct cm_counter_group *group;
4272 struct cm_counter_attribute *cm_attr;
4273
4274 group = container_of(obj, struct cm_counter_group, obj);
4275 cm_attr = container_of(attr, struct cm_counter_attribute, attr);
4276
4277 return sysfs_emit(buf, "%ld\n",
4278 atomic_long_read(&group->counter[cm_attr->index]));
4279 }
4280
4281 static const struct sysfs_ops cm_counter_ops = {
4282 .show = cm_show_counter
4283 };
4284
4285 static struct kobj_type cm_counter_obj_type = {
4286 .sysfs_ops = &cm_counter_ops,
4287 .default_attrs = cm_counter_default_attrs
4288 };
4289
4290 static int cm_create_port_fs(struct cm_port *port)
4291 {
4292 int i, ret;
4293
4294 for (i = 0; i < CM_COUNTER_GROUPS; i++) {
4295 ret = ib_port_register_module_stat(port->cm_dev->ib_device,
4296 port->port_num,
4297 &port->counter_group[i].obj,
4298 &cm_counter_obj_type,
4299 counter_group_names[i]);
4300 if (ret)
4301 goto error;
4302 }
4303
4304 return 0;
4305
4306 error:
4307 while (i--)
4308 ib_port_unregister_module_stat(&port->counter_group[i].obj);
4309 return ret;
4310
4311 }
4312
4313 static void cm_remove_port_fs(struct cm_port *port)
4314 {
4315 int i;
4316
4317 for (i = 0; i < CM_COUNTER_GROUPS; i++)
4318 ib_port_unregister_module_stat(&port->counter_group[i].obj);
4319
4320 }
4321
4322 static int cm_add_one(struct ib_device *ib_device)
4323 {
4324 struct cm_device *cm_dev;
4325 struct cm_port *port;
4326 struct ib_mad_reg_req reg_req = {
4327 .mgmt_class = IB_MGMT_CLASS_CM,
4328 .mgmt_class_version = IB_CM_CLASS_VERSION,
4329 };
4330 struct ib_port_modify port_modify = {
4331 .set_port_cap_mask = IB_PORT_CM_SUP
4332 };
4333 unsigned long flags;
4334 int ret;
4335 int count = 0;
4336 u8 i;
4337
4338 cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt),
4339 GFP_KERNEL);
4340 if (!cm_dev)
4341 return -ENOMEM;
4342
4343 cm_dev->ib_device = ib_device;
4344 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay;
4345 cm_dev->going_down = 0;
4346
4347 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
4348 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
4349 if (!rdma_cap_ib_cm(ib_device, i))
4350 continue;
4351
4352 port = kzalloc(sizeof *port, GFP_KERNEL);
4353 if (!port) {
4354 ret = -ENOMEM;
4355 goto error1;
4356 }
4357
4358 cm_dev->port[i-1] = port;
4359 port->cm_dev = cm_dev;
4360 port->port_num = i;
4361
4362 INIT_LIST_HEAD(&port->cm_priv_prim_list);
4363 INIT_LIST_HEAD(&port->cm_priv_altr_list);
4364
4365 ret = cm_create_port_fs(port);
4366 if (ret)
4367 goto error1;
4368
4369 port->mad_agent = ib_register_mad_agent(ib_device, i,
4370 IB_QPT_GSI,
4371 &reg_req,
4372 0,
4373 cm_send_handler,
4374 cm_recv_handler,
4375 port,
4376 0);
4377 if (IS_ERR(port->mad_agent)) {
4378 ret = PTR_ERR(port->mad_agent);
4379 goto error2;
4380 }
4381
4382 ret = ib_modify_port(ib_device, i, 0, &port_modify);
4383 if (ret)
4384 goto error3;
4385
4386 count++;
4387 }
4388
4389 if (!count) {
4390 ret = -EOPNOTSUPP;
4391 goto free;
4392 }
4393
4394 ib_set_client_data(ib_device, &cm_client, cm_dev);
4395
4396 write_lock_irqsave(&cm.device_lock, flags);
4397 list_add_tail(&cm_dev->list, &cm.device_list);
4398 write_unlock_irqrestore(&cm.device_lock, flags);
4399 return 0;
4400
4401 error3:
4402 ib_unregister_mad_agent(port->mad_agent);
4403 error2:
4404 cm_remove_port_fs(port);
4405 error1:
4406 port_modify.set_port_cap_mask = 0;
4407 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
4408 kfree(port);
4409 while (--i) {
4410 if (!rdma_cap_ib_cm(ib_device, i))
4411 continue;
4412
4413 port = cm_dev->port[i-1];
4414 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4415 ib_unregister_mad_agent(port->mad_agent);
4416 cm_remove_port_fs(port);
4417 kfree(port);
4418 }
4419 free:
4420 kfree(cm_dev);
4421 return ret;
4422 }
4423
4424 static void cm_remove_one(struct ib_device *ib_device, void *client_data)
4425 {
4426 struct cm_device *cm_dev = client_data;
4427 struct cm_port *port;
4428 struct cm_id_private *cm_id_priv;
4429 struct ib_mad_agent *cur_mad_agent;
4430 struct ib_port_modify port_modify = {
4431 .clr_port_cap_mask = IB_PORT_CM_SUP
4432 };
4433 unsigned long flags;
4434 int i;
4435
4436 write_lock_irqsave(&cm.device_lock, flags);
4437 list_del(&cm_dev->list);
4438 write_unlock_irqrestore(&cm.device_lock, flags);
4439
4440 spin_lock_irq(&cm.lock);
4441 cm_dev->going_down = 1;
4442 spin_unlock_irq(&cm.lock);
4443
4444 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
4445 if (!rdma_cap_ib_cm(ib_device, i))
4446 continue;
4447
4448 port = cm_dev->port[i-1];
4449 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4450 /* Mark all the cm_id's as not valid */
4451 spin_lock_irq(&cm.lock);
4452 list_for_each_entry(cm_id_priv, &port->cm_priv_altr_list, altr_list)
4453 cm_id_priv->altr_send_port_not_ready = 1;
4454 list_for_each_entry(cm_id_priv, &port->cm_priv_prim_list, prim_list)
4455 cm_id_priv->prim_send_port_not_ready = 1;
4456 spin_unlock_irq(&cm.lock);
4457 /*
4458 * We flush the queue here after the going_down set, this
4459 * verify that no new works will be queued in the recv handler,
4460 * after that we can call the unregister_mad_agent
4461 */
4462 flush_workqueue(cm.wq);
4463 spin_lock_irq(&cm.state_lock);
4464 cur_mad_agent = port->mad_agent;
4465 port->mad_agent = NULL;
4466 spin_unlock_irq(&cm.state_lock);
4467 ib_unregister_mad_agent(cur_mad_agent);
4468 cm_remove_port_fs(port);
4469 kfree(port);
4470 }
4471
4472 kfree(cm_dev);
4473 }
4474
4475 static int __init ib_cm_init(void)
4476 {
4477 int ret;
4478
4479 INIT_LIST_HEAD(&cm.device_list);
4480 rwlock_init(&cm.device_lock);
4481 spin_lock_init(&cm.lock);
4482 spin_lock_init(&cm.state_lock);
4483 cm.listen_service_table = RB_ROOT;
4484 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
4485 cm.remote_id_table = RB_ROOT;
4486 cm.remote_qp_table = RB_ROOT;
4487 cm.remote_sidr_table = RB_ROOT;
4488 xa_init_flags(&cm.local_id_table, XA_FLAGS_ALLOC);
4489 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
4490 INIT_LIST_HEAD(&cm.timewait_list);
4491
4492 cm.wq = alloc_workqueue("ib_cm", 0, 1);
4493 if (!cm.wq) {
4494 ret = -ENOMEM;
4495 goto error2;
4496 }
4497
4498 ret = ib_register_client(&cm_client);
4499 if (ret)
4500 goto error3;
4501
4502 return 0;
4503 error3:
4504 destroy_workqueue(cm.wq);
4505 error2:
4506 return ret;
4507 }
4508
4509 static void __exit ib_cm_cleanup(void)
4510 {
4511 struct cm_timewait_info *timewait_info, *tmp;
4512
4513 spin_lock_irq(&cm.lock);
4514 list_for_each_entry(timewait_info, &cm.timewait_list, list)
4515 cancel_delayed_work(&timewait_info->work.work);
4516 spin_unlock_irq(&cm.lock);
4517
4518 ib_unregister_client(&cm_client);
4519 destroy_workqueue(cm.wq);
4520
4521 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
4522 list_del(&timewait_info->list);
4523 kfree(timewait_info);
4524 }
4525
4526 WARN_ON(!xa_empty(&cm.local_id_table));
4527 }
4528
4529 module_init(ib_cm_init);
4530 module_exit(ib_cm_cleanup);
Linux with added FPC-III support