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
ibcm_reject_msg(int reason)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 u32 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 */
260 int listen_sharecount;
261 struct rcu_head rcu;
262
263 struct ib_mad_send_buf *msg;
264 struct cm_timewait_info *timewait_info;
265 /* todo: use alternate port on send failure */
266 struct cm_av av;
267 struct cm_av alt_av;
268
269 void *private_data;
270 __be64 tid;
271 __be32 local_qpn;
272 __be32 remote_qpn;
273 enum ib_qp_type qp_type;
274 __be32 sq_psn;
275 __be32 rq_psn;
276 int timeout_ms;
277 enum ib_mtu path_mtu;
278 __be16 pkey;
279 u8 private_data_len;
280 u8 max_cm_retries;
281 u8 responder_resources;
282 u8 initiator_depth;
283 u8 retry_count;
284 u8 rnr_retry_count;
285 u8 service_timeout;
286 u8 target_ack_delay;
287
288 struct list_head prim_list;
289 struct list_head altr_list;
290 /* Indicates that the send port mad is registered and av is set */
291 int prim_send_port_not_ready;
292 int altr_send_port_not_ready;
293
294 struct list_head work_list;
295 atomic_t work_count;
296
297 struct rdma_ucm_ece ece;
298 };
299
300 static void cm_work_handler(struct work_struct *work);
301
cm_deref_id(struct cm_id_private * cm_id_priv)302 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
303 {
304 if (refcount_dec_and_test(&cm_id_priv->refcount))
305 complete(&cm_id_priv->comp);
306 }
307
cm_alloc_msg(struct cm_id_private * cm_id_priv,struct ib_mad_send_buf ** msg)308 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
309 struct ib_mad_send_buf **msg)
310 {
311 struct ib_mad_agent *mad_agent;
312 struct ib_mad_send_buf *m;
313 struct ib_ah *ah;
314 struct cm_av *av;
315 unsigned long flags, flags2;
316 int ret = 0;
317
318 /* don't let the port to be released till the agent is down */
319 spin_lock_irqsave(&cm.state_lock, flags2);
320 spin_lock_irqsave(&cm.lock, flags);
321 if (!cm_id_priv->prim_send_port_not_ready)
322 av = &cm_id_priv->av;
323 else if (!cm_id_priv->altr_send_port_not_ready &&
324 (cm_id_priv->alt_av.port))
325 av = &cm_id_priv->alt_av;
326 else {
327 pr_info("%s: not valid CM id\n", __func__);
328 ret = -ENODEV;
329 spin_unlock_irqrestore(&cm.lock, flags);
330 goto out;
331 }
332 spin_unlock_irqrestore(&cm.lock, flags);
333 /* Make sure the port haven't released the mad yet */
334 mad_agent = cm_id_priv->av.port->mad_agent;
335 if (!mad_agent) {
336 pr_info("%s: not a valid MAD agent\n", __func__);
337 ret = -ENODEV;
338 goto out;
339 }
340 ah = rdma_create_ah(mad_agent->qp->pd, &av->ah_attr, 0);
341 if (IS_ERR(ah)) {
342 ret = PTR_ERR(ah);
343 goto out;
344 }
345
346 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
347 av->pkey_index,
348 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
349 GFP_ATOMIC,
350 IB_MGMT_BASE_VERSION);
351 if (IS_ERR(m)) {
352 rdma_destroy_ah(ah, 0);
353 ret = PTR_ERR(m);
354 goto out;
355 }
356
357 /* Timeout set by caller if response is expected. */
358 m->ah = ah;
359 m->retries = cm_id_priv->max_cm_retries;
360
361 refcount_inc(&cm_id_priv->refcount);
362 m->context[0] = cm_id_priv;
363 *msg = m;
364
365 out:
366 spin_unlock_irqrestore(&cm.state_lock, flags2);
367 return ret;
368 }
369
cm_alloc_response_msg_no_ah(struct cm_port * port,struct ib_mad_recv_wc * mad_recv_wc)370 static struct ib_mad_send_buf *cm_alloc_response_msg_no_ah(struct cm_port *port,
371 struct ib_mad_recv_wc *mad_recv_wc)
372 {
373 return ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
374 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
375 GFP_ATOMIC,
376 IB_MGMT_BASE_VERSION);
377 }
378
cm_create_response_msg_ah(struct cm_port * port,struct ib_mad_recv_wc * mad_recv_wc,struct ib_mad_send_buf * msg)379 static int cm_create_response_msg_ah(struct cm_port *port,
380 struct ib_mad_recv_wc *mad_recv_wc,
381 struct ib_mad_send_buf *msg)
382 {
383 struct ib_ah *ah;
384
385 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
386 mad_recv_wc->recv_buf.grh, port->port_num);
387 if (IS_ERR(ah))
388 return PTR_ERR(ah);
389
390 msg->ah = ah;
391 return 0;
392 }
393
cm_free_msg(struct ib_mad_send_buf * msg)394 static void cm_free_msg(struct ib_mad_send_buf *msg)
395 {
396 if (msg->ah)
397 rdma_destroy_ah(msg->ah, 0);
398 if (msg->context[0])
399 cm_deref_id(msg->context[0]);
400 ib_free_send_mad(msg);
401 }
402
cm_alloc_response_msg(struct cm_port * port,struct ib_mad_recv_wc * mad_recv_wc,struct ib_mad_send_buf ** msg)403 static int cm_alloc_response_msg(struct cm_port *port,
404 struct ib_mad_recv_wc *mad_recv_wc,
405 struct ib_mad_send_buf **msg)
406 {
407 struct ib_mad_send_buf *m;
408 int ret;
409
410 m = cm_alloc_response_msg_no_ah(port, mad_recv_wc);
411 if (IS_ERR(m))
412 return PTR_ERR(m);
413
414 ret = cm_create_response_msg_ah(port, mad_recv_wc, m);
415 if (ret) {
416 cm_free_msg(m);
417 return ret;
418 }
419
420 *msg = m;
421 return 0;
422 }
423
cm_copy_private_data(const void * private_data,u8 private_data_len)424 static void *cm_copy_private_data(const void *private_data, 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
cm_set_private_data(struct cm_id_private * cm_id_priv,void * private_data,u8 private_data_len)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
cm_init_av_for_lap(struct cm_port * port,struct ib_wc * wc,struct ib_grh * grh,struct cm_av * av)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
cm_init_av_for_response(struct cm_port * port,struct ib_wc * wc,struct ib_grh * grh,struct cm_av * av)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
add_cm_id_to_port_list(struct cm_id_private * cm_id_priv,struct cm_av * av,struct cm_port * port)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 *
get_cm_port_from_path(struct sa_path_rec * path,const struct ib_gid_attr * attr)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
cm_init_av_by_path(struct sa_path_rec * path,const struct ib_gid_attr * sgid_attr,struct cm_av * av,struct cm_id_private * cm_id_priv)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
cm_local_id(__be32 local_id)582 static u32 cm_local_id(__be32 local_id)
583 {
584 return (__force u32) (local_id ^ cm.random_id_operand);
585 }
586
cm_acquire_id(__be32 local_id,__be32 remote_id)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 */
be32_lt(__be32 a,__be32 b)606 static int be32_lt(__be32 a, __be32 b)
607 {
608 return (__force u32) a < (__force u32) b;
609 }
610
be32_gt(__be32 a,__be32 b)611 static int be32_gt(__be32 a, __be32 b)
612 {
613 return (__force u32) a > (__force u32) b;
614 }
615
be64_lt(__be64 a,__be64 b)616 static int be64_lt(__be64 a, __be64 b)
617 {
618 return (__force u64) a < (__force u64) b;
619 }
620
be64_gt(__be64 a,__be64 b)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 */
cm_insert_listen(struct cm_id_private * cm_id_priv,ib_cm_handler shared_handler)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
cm_find_listen(struct ib_device * device,__be64 service_id)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 * timewait_info)712 cm_insert_remote_id(struct cm_timewait_info *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
cm_find_remote_id(__be64 remote_ca_guid,__be32 remote_id)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 * timewait_info)771 cm_insert_remote_qpn(struct cm_timewait_info *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 * cm_id_priv)801 cm_insert_remote_sidr(struct cm_id_private *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
cm_alloc_id_priv(struct ib_device * device,ib_cm_handler cm_handler,void * context)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 */
cm_finalize_id(struct cm_id_private * cm_id_priv)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
ib_create_cm_id(struct ib_device * device,ib_cm_handler cm_handler,void * context)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
cm_dequeue_work(struct cm_id_private * cm_id_priv)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
cm_free_work(struct cm_work * work)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
cm_queue_work_unlock(struct cm_id_private * cm_id_priv,struct cm_work * work)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
cm_convert_to_ms(int iba_time)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 */
cm_ack_timeout(u8 ca_ack_delay,u8 packet_life_time)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
cm_remove_remote(struct cm_id_private * cm_id_priv)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
cm_create_timewait_info(__be32 local_id)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
cm_enter_timewait(struct cm_id_private * cm_id_priv)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
cm_reset_to_idle(struct cm_id_private * cm_id_priv)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
cm_destroy_id(struct ib_cm_id * cm_id,int err)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
ib_destroy_cm_id(struct ib_cm_id * cm_id)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
cm_init_listen(struct cm_id_private * cm_id_priv,__be64 service_id,__be64 service_mask)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 */
ib_cm_listen(struct ib_cm_id * cm_id,__be64 service_id,__be64 service_mask)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 */
ib_cm_insert_listen(struct ib_device * device,ib_cm_handler cm_handler,__be64 service_id)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
cm_form_tid(struct cm_id_private * cm_id_priv)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
cm_format_mad_hdr(struct ib_mad_hdr * hdr,__be16 attr_id,__be64 tid)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
cm_format_mad_ece_hdr(struct ib_mad_hdr * hdr,__be16 attr_id,__be64 tid,u32 attr_mod)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
cm_format_req(struct cm_req_msg * req_msg,struct cm_id_private * cm_id_priv,struct ib_cm_req_param * param)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
cm_validate_req_param(struct ib_cm_req_param * param)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
ib_send_cm_req(struct ib_cm_id * cm_id,struct ib_cm_req_param * param)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
cm_issue_rej(struct cm_port * port,struct ib_mad_recv_wc * mad_recv_wc,enum ib_cm_rej_reason reason,enum cm_msg_response msg_rejected,void * ari,u8 ari_length)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
cm_req_has_alt_path(struct cm_req_msg * req_msg)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
cm_path_set_rec_type(struct ib_device * ib_device,u32 port_num,struct sa_path_rec * path,union ib_gid * gid)1634 static void cm_path_set_rec_type(struct ib_device *ib_device, u32 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
cm_format_path_lid_from_req(struct cm_req_msg * req_msg,struct sa_path_rec * primary_path,struct sa_path_rec * alt_path)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
cm_format_paths_from_req(struct cm_req_msg * req_msg,struct sa_path_rec * primary_path,struct sa_path_rec * alt_path)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
cm_get_bth_pkey(struct cm_work * work)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 u32 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 */
cm_opa_to_ib_sgid(struct cm_work * work,struct sa_path_rec * path)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 u32 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
cm_format_req_event(struct cm_work * work,struct cm_id_private * cm_id_priv,struct ib_cm_id * listen_id)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
cm_process_work(struct cm_id_private * cm_id_priv,struct cm_work * work)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
cm_format_mra(struct cm_mra_msg * mra_msg,struct cm_id_private * cm_id_priv,enum cm_msg_response msg_mraed,u8 service_timeout,const void * private_data,u8 private_data_len)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
cm_format_rej(struct cm_rej_msg * rej_msg,struct cm_id_private * cm_id_priv,enum ib_cm_rej_reason reason,void * ari,u8 ari_length,const void * private_data,u8 private_data_len,enum ib_cm_state state)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
cm_dup_req_handler(struct cm_work * work,struct cm_id_private * cm_id_priv)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
cm_match_req(struct cm_work * work,struct cm_id_private * cm_id_priv)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 */
cm_process_routed_req(struct cm_req_msg * req_msg,struct ib_wc * wc)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
cm_req_handler(struct cm_work * work)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 memset(&work->path[0], 0, sizeof(work->path[0]));
2142 if (cm_req_has_alt_path(req_msg))
2143 memset(&work->path[1], 0, sizeof(work->path[1]));
2144 grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr);
2145 gid_attr = grh->sgid_attr;
2146
2147 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE) {
2148 work->path[0].rec_type =
2149 sa_conv_gid_to_pathrec_type(gid_attr->gid_type);
2150 } else {
2151 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
2152 cm_path_set_rec_type(
2153 work->port->cm_dev->ib_device, work->port->port_num,
2154 &work->path[0],
2155 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID,
2156 req_msg));
2157 }
2158 if (cm_req_has_alt_path(req_msg))
2159 work->path[1].rec_type = work->path[0].rec_type;
2160 cm_format_paths_from_req(req_msg, &work->path[0],
2161 &work->path[1]);
2162 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE)
2163 sa_path_set_dmac(&work->path[0],
2164 cm_id_priv->av.ah_attr.roce.dmac);
2165 work->path[0].hop_limit = grh->hop_limit;
2166 ret = cm_init_av_by_path(&work->path[0], gid_attr, &cm_id_priv->av,
2167 cm_id_priv);
2168 if (ret) {
2169 int err;
2170
2171 err = rdma_query_gid(work->port->cm_dev->ib_device,
2172 work->port->port_num, 0,
2173 &work->path[0].sgid);
2174 if (err)
2175 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID,
2176 NULL, 0, NULL, 0);
2177 else
2178 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID,
2179 &work->path[0].sgid,
2180 sizeof(work->path[0].sgid),
2181 NULL, 0);
2182 goto rejected;
2183 }
2184 if (cm_req_has_alt_path(req_msg)) {
2185 ret = cm_init_av_by_path(&work->path[1], NULL,
2186 &cm_id_priv->alt_av, cm_id_priv);
2187 if (ret) {
2188 ib_send_cm_rej(&cm_id_priv->id,
2189 IB_CM_REJ_INVALID_ALT_GID,
2190 &work->path[0].sgid,
2191 sizeof(work->path[0].sgid), NULL, 0);
2192 goto rejected;
2193 }
2194 }
2195
2196 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
2197 cm_id_priv->id.context = listen_cm_id_priv->id.context;
2198 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
2199
2200 /* Now MAD handlers can see the new ID */
2201 spin_lock_irq(&cm_id_priv->lock);
2202 cm_finalize_id(cm_id_priv);
2203
2204 /* Refcount belongs to the event, pairs with cm_process_work() */
2205 refcount_inc(&cm_id_priv->refcount);
2206 cm_queue_work_unlock(cm_id_priv, work);
2207 /*
2208 * Since this ID was just created and was not made visible to other MAD
2209 * handlers until the cm_finalize_id() above we know that the
2210 * cm_process_work() will deliver the event and the listen_cm_id
2211 * embedded in the event can be derefed here.
2212 */
2213 cm_deref_id(listen_cm_id_priv);
2214 return 0;
2215
2216 rejected:
2217 cm_deref_id(listen_cm_id_priv);
2218 destroy:
2219 ib_destroy_cm_id(&cm_id_priv->id);
2220 return ret;
2221 }
2222
cm_format_rep(struct cm_rep_msg * rep_msg,struct cm_id_private * cm_id_priv,struct ib_cm_rep_param * param)2223 static void cm_format_rep(struct cm_rep_msg *rep_msg,
2224 struct cm_id_private *cm_id_priv,
2225 struct ib_cm_rep_param *param)
2226 {
2227 cm_format_mad_ece_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid,
2228 param->ece.attr_mod);
2229 IBA_SET(CM_REP_LOCAL_COMM_ID, rep_msg,
2230 be32_to_cpu(cm_id_priv->id.local_id));
2231 IBA_SET(CM_REP_REMOTE_COMM_ID, rep_msg,
2232 be32_to_cpu(cm_id_priv->id.remote_id));
2233 IBA_SET(CM_REP_STARTING_PSN, rep_msg, param->starting_psn);
2234 IBA_SET(CM_REP_RESPONDER_RESOURCES, rep_msg,
2235 param->responder_resources);
2236 IBA_SET(CM_REP_TARGET_ACK_DELAY, rep_msg,
2237 cm_id_priv->av.port->cm_dev->ack_delay);
2238 IBA_SET(CM_REP_FAILOVER_ACCEPTED, rep_msg, param->failover_accepted);
2239 IBA_SET(CM_REP_RNR_RETRY_COUNT, rep_msg, param->rnr_retry_count);
2240 IBA_SET(CM_REP_LOCAL_CA_GUID, rep_msg,
2241 be64_to_cpu(cm_id_priv->id.device->node_guid));
2242
2243 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
2244 IBA_SET(CM_REP_INITIATOR_DEPTH, rep_msg,
2245 param->initiator_depth);
2246 IBA_SET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg,
2247 param->flow_control);
2248 IBA_SET(CM_REP_SRQ, rep_msg, param->srq);
2249 IBA_SET(CM_REP_LOCAL_QPN, rep_msg, param->qp_num);
2250 } else {
2251 IBA_SET(CM_REP_SRQ, rep_msg, 1);
2252 IBA_SET(CM_REP_LOCAL_EE_CONTEXT_NUMBER, rep_msg, param->qp_num);
2253 }
2254
2255 IBA_SET(CM_REP_VENDOR_ID_L, rep_msg, param->ece.vendor_id);
2256 IBA_SET(CM_REP_VENDOR_ID_M, rep_msg, param->ece.vendor_id >> 8);
2257 IBA_SET(CM_REP_VENDOR_ID_H, rep_msg, param->ece.vendor_id >> 16);
2258
2259 if (param->private_data && param->private_data_len)
2260 IBA_SET_MEM(CM_REP_PRIVATE_DATA, rep_msg, param->private_data,
2261 param->private_data_len);
2262 }
2263
ib_send_cm_rep(struct ib_cm_id * cm_id,struct ib_cm_rep_param * param)2264 int ib_send_cm_rep(struct ib_cm_id *cm_id,
2265 struct ib_cm_rep_param *param)
2266 {
2267 struct cm_id_private *cm_id_priv;
2268 struct ib_mad_send_buf *msg;
2269 struct cm_rep_msg *rep_msg;
2270 unsigned long flags;
2271 int ret;
2272
2273 if (param->private_data &&
2274 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
2275 return -EINVAL;
2276
2277 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2278 spin_lock_irqsave(&cm_id_priv->lock, flags);
2279 if (cm_id->state != IB_CM_REQ_RCVD &&
2280 cm_id->state != IB_CM_MRA_REQ_SENT) {
2281 trace_icm_send_rep_err(cm_id_priv->id.local_id, cm_id->state);
2282 ret = -EINVAL;
2283 goto out;
2284 }
2285
2286 ret = cm_alloc_msg(cm_id_priv, &msg);
2287 if (ret)
2288 goto out;
2289
2290 rep_msg = (struct cm_rep_msg *) msg->mad;
2291 cm_format_rep(rep_msg, cm_id_priv, param);
2292 msg->timeout_ms = cm_id_priv->timeout_ms;
2293 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
2294
2295 trace_icm_send_rep(cm_id);
2296 ret = ib_post_send_mad(msg, NULL);
2297 if (ret) {
2298 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2299 cm_free_msg(msg);
2300 return ret;
2301 }
2302
2303 cm_id->state = IB_CM_REP_SENT;
2304 cm_id_priv->msg = msg;
2305 cm_id_priv->initiator_depth = param->initiator_depth;
2306 cm_id_priv->responder_resources = param->responder_resources;
2307 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg));
2308 WARN_ONCE(param->qp_num & 0xFF000000,
2309 "IBTA declares QPN to be 24 bits, but it is 0x%X\n",
2310 param->qp_num);
2311 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
2312
2313 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2314 return ret;
2315 }
2316 EXPORT_SYMBOL(ib_send_cm_rep);
2317
cm_format_rtu(struct cm_rtu_msg * rtu_msg,struct cm_id_private * cm_id_priv,const void * private_data,u8 private_data_len)2318 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
2319 struct cm_id_private *cm_id_priv,
2320 const void *private_data,
2321 u8 private_data_len)
2322 {
2323 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
2324 IBA_SET(CM_RTU_LOCAL_COMM_ID, rtu_msg,
2325 be32_to_cpu(cm_id_priv->id.local_id));
2326 IBA_SET(CM_RTU_REMOTE_COMM_ID, rtu_msg,
2327 be32_to_cpu(cm_id_priv->id.remote_id));
2328
2329 if (private_data && private_data_len)
2330 IBA_SET_MEM(CM_RTU_PRIVATE_DATA, rtu_msg, private_data,
2331 private_data_len);
2332 }
2333
ib_send_cm_rtu(struct ib_cm_id * cm_id,const void * private_data,u8 private_data_len)2334 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
2335 const void *private_data,
2336 u8 private_data_len)
2337 {
2338 struct cm_id_private *cm_id_priv;
2339 struct ib_mad_send_buf *msg;
2340 unsigned long flags;
2341 void *data;
2342 int ret;
2343
2344 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
2345 return -EINVAL;
2346
2347 data = cm_copy_private_data(private_data, private_data_len);
2348 if (IS_ERR(data))
2349 return PTR_ERR(data);
2350
2351 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2352 spin_lock_irqsave(&cm_id_priv->lock, flags);
2353 if (cm_id->state != IB_CM_REP_RCVD &&
2354 cm_id->state != IB_CM_MRA_REP_SENT) {
2355 trace_icm_send_cm_rtu_err(cm_id);
2356 ret = -EINVAL;
2357 goto error;
2358 }
2359
2360 ret = cm_alloc_msg(cm_id_priv, &msg);
2361 if (ret)
2362 goto error;
2363
2364 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2365 private_data, private_data_len);
2366
2367 trace_icm_send_rtu(cm_id);
2368 ret = ib_post_send_mad(msg, NULL);
2369 if (ret) {
2370 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2371 cm_free_msg(msg);
2372 kfree(data);
2373 return ret;
2374 }
2375
2376 cm_id->state = IB_CM_ESTABLISHED;
2377 cm_set_private_data(cm_id_priv, data, private_data_len);
2378 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2379 return 0;
2380
2381 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2382 kfree(data);
2383 return ret;
2384 }
2385 EXPORT_SYMBOL(ib_send_cm_rtu);
2386
cm_format_rep_event(struct cm_work * work,enum ib_qp_type qp_type)2387 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
2388 {
2389 struct cm_rep_msg *rep_msg;
2390 struct ib_cm_rep_event_param *param;
2391
2392 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2393 param = &work->cm_event.param.rep_rcvd;
2394 param->remote_ca_guid =
2395 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg));
2396 param->remote_qkey = IBA_GET(CM_REP_LOCAL_Q_KEY, rep_msg);
2397 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
2398 param->starting_psn = IBA_GET(CM_REP_STARTING_PSN, rep_msg);
2399 param->responder_resources = IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg);
2400 param->initiator_depth = IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg);
2401 param->target_ack_delay = IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg);
2402 param->failover_accepted = IBA_GET(CM_REP_FAILOVER_ACCEPTED, rep_msg);
2403 param->flow_control = IBA_GET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg);
2404 param->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg);
2405 param->srq = IBA_GET(CM_REP_SRQ, rep_msg);
2406 param->ece.vendor_id = IBA_GET(CM_REP_VENDOR_ID_H, rep_msg) << 16;
2407 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_M, rep_msg) << 8;
2408 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_L, rep_msg);
2409 param->ece.attr_mod = be32_to_cpu(rep_msg->hdr.attr_mod);
2410
2411 work->cm_event.private_data =
2412 IBA_GET_MEM_PTR(CM_REP_PRIVATE_DATA, rep_msg);
2413 }
2414
cm_dup_rep_handler(struct cm_work * work)2415 static void cm_dup_rep_handler(struct cm_work *work)
2416 {
2417 struct cm_id_private *cm_id_priv;
2418 struct cm_rep_msg *rep_msg;
2419 struct ib_mad_send_buf *msg = NULL;
2420 int ret;
2421
2422 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
2423 cm_id_priv = cm_acquire_id(
2424 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)),
2425 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)));
2426 if (!cm_id_priv)
2427 return;
2428
2429 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2430 counter[CM_REP_COUNTER]);
2431 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
2432 if (ret)
2433 goto deref;
2434
2435 spin_lock_irq(&cm_id_priv->lock);
2436 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
2437 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2438 cm_id_priv->private_data,
2439 cm_id_priv->private_data_len);
2440 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
2441 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2442 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
2443 cm_id_priv->private_data,
2444 cm_id_priv->private_data_len);
2445 else
2446 goto unlock;
2447 spin_unlock_irq(&cm_id_priv->lock);
2448
2449 trace_icm_send_dup_rep(&cm_id_priv->id);
2450 ret = ib_post_send_mad(msg, NULL);
2451 if (ret)
2452 goto free;
2453 goto deref;
2454
2455 unlock: spin_unlock_irq(&cm_id_priv->lock);
2456 free: cm_free_msg(msg);
2457 deref: cm_deref_id(cm_id_priv);
2458 }
2459
cm_rep_handler(struct cm_work * work)2460 static int cm_rep_handler(struct cm_work *work)
2461 {
2462 struct cm_id_private *cm_id_priv;
2463 struct cm_rep_msg *rep_msg;
2464 int ret;
2465 struct cm_id_private *cur_cm_id_priv;
2466 struct cm_timewait_info *timewait_info;
2467
2468 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2469 cm_id_priv = cm_acquire_id(
2470 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 0);
2471 if (!cm_id_priv) {
2472 cm_dup_rep_handler(work);
2473 trace_icm_remote_no_priv_err(
2474 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2475 return -EINVAL;
2476 }
2477
2478 cm_format_rep_event(work, cm_id_priv->qp_type);
2479
2480 spin_lock_irq(&cm_id_priv->lock);
2481 switch (cm_id_priv->id.state) {
2482 case IB_CM_REQ_SENT:
2483 case IB_CM_MRA_REQ_RCVD:
2484 break;
2485 default:
2486 ret = -EINVAL;
2487 trace_icm_rep_unknown_err(
2488 IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg),
2489 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg),
2490 cm_id_priv->id.state);
2491 spin_unlock_irq(&cm_id_priv->lock);
2492 goto error;
2493 }
2494
2495 cm_id_priv->timewait_info->work.remote_id =
2496 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg));
2497 cm_id_priv->timewait_info->remote_ca_guid =
2498 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg));
2499 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2500
2501 spin_lock(&cm.lock);
2502 /* Check for duplicate REP. */
2503 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
2504 spin_unlock(&cm.lock);
2505 spin_unlock_irq(&cm_id_priv->lock);
2506 ret = -EINVAL;
2507 trace_icm_insert_failed_err(
2508 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2509 goto error;
2510 }
2511 /* Check for a stale connection. */
2512 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
2513 if (timewait_info) {
2514 cm_remove_remote(cm_id_priv);
2515 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2516 timewait_info->work.remote_id);
2517
2518 spin_unlock(&cm.lock);
2519 spin_unlock_irq(&cm_id_priv->lock);
2520 cm_issue_rej(work->port, work->mad_recv_wc,
2521 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
2522 NULL, 0);
2523 ret = -EINVAL;
2524 trace_icm_staleconn_err(
2525 IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg),
2526 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2527
2528 if (cur_cm_id_priv) {
2529 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0);
2530 cm_deref_id(cur_cm_id_priv);
2531 }
2532
2533 goto error;
2534 }
2535 spin_unlock(&cm.lock);
2536
2537 cm_id_priv->id.state = IB_CM_REP_RCVD;
2538 cm_id_priv->id.remote_id =
2539 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg));
2540 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2541 cm_id_priv->initiator_depth =
2542 IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg);
2543 cm_id_priv->responder_resources =
2544 IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg);
2545 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg));
2546 cm_id_priv->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg);
2547 cm_id_priv->target_ack_delay =
2548 IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg);
2549 cm_id_priv->av.timeout =
2550 cm_ack_timeout(cm_id_priv->target_ack_delay,
2551 cm_id_priv->av.timeout - 1);
2552 cm_id_priv->alt_av.timeout =
2553 cm_ack_timeout(cm_id_priv->target_ack_delay,
2554 cm_id_priv->alt_av.timeout - 1);
2555
2556 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2557 cm_queue_work_unlock(cm_id_priv, work);
2558 return 0;
2559
2560 error:
2561 cm_deref_id(cm_id_priv);
2562 return ret;
2563 }
2564
cm_establish_handler(struct cm_work * work)2565 static int cm_establish_handler(struct cm_work *work)
2566 {
2567 struct cm_id_private *cm_id_priv;
2568
2569 /* See comment in cm_establish about lookup. */
2570 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
2571 if (!cm_id_priv)
2572 return -EINVAL;
2573
2574 spin_lock_irq(&cm_id_priv->lock);
2575 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
2576 spin_unlock_irq(&cm_id_priv->lock);
2577 goto out;
2578 }
2579
2580 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2581 cm_queue_work_unlock(cm_id_priv, work);
2582 return 0;
2583 out:
2584 cm_deref_id(cm_id_priv);
2585 return -EINVAL;
2586 }
2587
cm_rtu_handler(struct cm_work * work)2588 static int cm_rtu_handler(struct cm_work *work)
2589 {
2590 struct cm_id_private *cm_id_priv;
2591 struct cm_rtu_msg *rtu_msg;
2592
2593 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
2594 cm_id_priv = cm_acquire_id(
2595 cpu_to_be32(IBA_GET(CM_RTU_REMOTE_COMM_ID, rtu_msg)),
2596 cpu_to_be32(IBA_GET(CM_RTU_LOCAL_COMM_ID, rtu_msg)));
2597 if (!cm_id_priv)
2598 return -EINVAL;
2599
2600 work->cm_event.private_data =
2601 IBA_GET_MEM_PTR(CM_RTU_PRIVATE_DATA, rtu_msg);
2602
2603 spin_lock_irq(&cm_id_priv->lock);
2604 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
2605 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
2606 spin_unlock_irq(&cm_id_priv->lock);
2607 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2608 counter[CM_RTU_COUNTER]);
2609 goto out;
2610 }
2611 cm_id_priv->id.state = IB_CM_ESTABLISHED;
2612
2613 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2614 cm_queue_work_unlock(cm_id_priv, work);
2615 return 0;
2616 out:
2617 cm_deref_id(cm_id_priv);
2618 return -EINVAL;
2619 }
2620
cm_format_dreq(struct cm_dreq_msg * dreq_msg,struct cm_id_private * cm_id_priv,const void * private_data,u8 private_data_len)2621 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
2622 struct cm_id_private *cm_id_priv,
2623 const void *private_data,
2624 u8 private_data_len)
2625 {
2626 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
2627 cm_form_tid(cm_id_priv));
2628 IBA_SET(CM_DREQ_LOCAL_COMM_ID, dreq_msg,
2629 be32_to_cpu(cm_id_priv->id.local_id));
2630 IBA_SET(CM_DREQ_REMOTE_COMM_ID, dreq_msg,
2631 be32_to_cpu(cm_id_priv->id.remote_id));
2632 IBA_SET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg,
2633 be32_to_cpu(cm_id_priv->remote_qpn));
2634
2635 if (private_data && private_data_len)
2636 IBA_SET_MEM(CM_DREQ_PRIVATE_DATA, dreq_msg, private_data,
2637 private_data_len);
2638 }
2639
cm_send_dreq_locked(struct cm_id_private * cm_id_priv,const void * private_data,u8 private_data_len)2640 static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv,
2641 const void *private_data, u8 private_data_len)
2642 {
2643 struct ib_mad_send_buf *msg;
2644 int ret;
2645
2646 lockdep_assert_held(&cm_id_priv->lock);
2647
2648 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
2649 return -EINVAL;
2650
2651 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
2652 trace_icm_dreq_skipped(&cm_id_priv->id);
2653 return -EINVAL;
2654 }
2655
2656 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2657 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2658 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2659
2660 ret = cm_alloc_msg(cm_id_priv, &msg);
2661 if (ret) {
2662 cm_enter_timewait(cm_id_priv);
2663 return ret;
2664 }
2665
2666 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2667 private_data, private_data_len);
2668 msg->timeout_ms = cm_id_priv->timeout_ms;
2669 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2670
2671 trace_icm_send_dreq(&cm_id_priv->id);
2672 ret = ib_post_send_mad(msg, NULL);
2673 if (ret) {
2674 cm_enter_timewait(cm_id_priv);
2675 cm_free_msg(msg);
2676 return ret;
2677 }
2678
2679 cm_id_priv->id.state = IB_CM_DREQ_SENT;
2680 cm_id_priv->msg = msg;
2681 return 0;
2682 }
2683
ib_send_cm_dreq(struct ib_cm_id * cm_id,const void * private_data,u8 private_data_len)2684 int ib_send_cm_dreq(struct ib_cm_id *cm_id, const void *private_data,
2685 u8 private_data_len)
2686 {
2687 struct cm_id_private *cm_id_priv =
2688 container_of(cm_id, struct cm_id_private, id);
2689 unsigned long flags;
2690 int ret;
2691
2692 spin_lock_irqsave(&cm_id_priv->lock, flags);
2693 ret = cm_send_dreq_locked(cm_id_priv, private_data, private_data_len);
2694 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2695 return ret;
2696 }
2697 EXPORT_SYMBOL(ib_send_cm_dreq);
2698
cm_format_drep(struct cm_drep_msg * drep_msg,struct cm_id_private * cm_id_priv,const void * private_data,u8 private_data_len)2699 static void cm_format_drep(struct cm_drep_msg *drep_msg,
2700 struct cm_id_private *cm_id_priv,
2701 const void *private_data,
2702 u8 private_data_len)
2703 {
2704 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2705 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg,
2706 be32_to_cpu(cm_id_priv->id.local_id));
2707 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg,
2708 be32_to_cpu(cm_id_priv->id.remote_id));
2709
2710 if (private_data && private_data_len)
2711 IBA_SET_MEM(CM_DREP_PRIVATE_DATA, drep_msg, private_data,
2712 private_data_len);
2713 }
2714
cm_send_drep_locked(struct cm_id_private * cm_id_priv,void * private_data,u8 private_data_len)2715 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv,
2716 void *private_data, u8 private_data_len)
2717 {
2718 struct ib_mad_send_buf *msg;
2719 int ret;
2720
2721 lockdep_assert_held(&cm_id_priv->lock);
2722
2723 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2724 return -EINVAL;
2725
2726 if (cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2727 trace_icm_send_drep_err(&cm_id_priv->id);
2728 kfree(private_data);
2729 return -EINVAL;
2730 }
2731
2732 cm_set_private_data(cm_id_priv, private_data, private_data_len);
2733 cm_enter_timewait(cm_id_priv);
2734
2735 ret = cm_alloc_msg(cm_id_priv, &msg);
2736 if (ret)
2737 return ret;
2738
2739 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2740 private_data, private_data_len);
2741
2742 trace_icm_send_drep(&cm_id_priv->id);
2743 ret = ib_post_send_mad(msg, NULL);
2744 if (ret) {
2745 cm_free_msg(msg);
2746 return ret;
2747 }
2748 return 0;
2749 }
2750
ib_send_cm_drep(struct ib_cm_id * cm_id,const void * private_data,u8 private_data_len)2751 int ib_send_cm_drep(struct ib_cm_id *cm_id, const void *private_data,
2752 u8 private_data_len)
2753 {
2754 struct cm_id_private *cm_id_priv =
2755 container_of(cm_id, struct cm_id_private, id);
2756 unsigned long flags;
2757 void *data;
2758 int ret;
2759
2760 data = cm_copy_private_data(private_data, private_data_len);
2761 if (IS_ERR(data))
2762 return PTR_ERR(data);
2763
2764 spin_lock_irqsave(&cm_id_priv->lock, flags);
2765 ret = cm_send_drep_locked(cm_id_priv, data, private_data_len);
2766 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2767 return ret;
2768 }
2769 EXPORT_SYMBOL(ib_send_cm_drep);
2770
cm_issue_drep(struct cm_port * port,struct ib_mad_recv_wc * mad_recv_wc)2771 static int cm_issue_drep(struct cm_port *port,
2772 struct ib_mad_recv_wc *mad_recv_wc)
2773 {
2774 struct ib_mad_send_buf *msg = NULL;
2775 struct cm_dreq_msg *dreq_msg;
2776 struct cm_drep_msg *drep_msg;
2777 int ret;
2778
2779 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2780 if (ret)
2781 return ret;
2782
2783 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2784 drep_msg = (struct cm_drep_msg *) msg->mad;
2785
2786 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2787 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg,
2788 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg));
2789 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg,
2790 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2791
2792 trace_icm_issue_drep(
2793 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg),
2794 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2795 ret = ib_post_send_mad(msg, NULL);
2796 if (ret)
2797 cm_free_msg(msg);
2798
2799 return ret;
2800 }
2801
cm_dreq_handler(struct cm_work * work)2802 static int cm_dreq_handler(struct cm_work *work)
2803 {
2804 struct cm_id_private *cm_id_priv;
2805 struct cm_dreq_msg *dreq_msg;
2806 struct ib_mad_send_buf *msg = NULL;
2807
2808 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2809 cm_id_priv = cm_acquire_id(
2810 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)),
2811 cpu_to_be32(IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg)));
2812 if (!cm_id_priv) {
2813 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2814 counter[CM_DREQ_COUNTER]);
2815 cm_issue_drep(work->port, work->mad_recv_wc);
2816 trace_icm_no_priv_err(
2817 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg),
2818 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2819 return -EINVAL;
2820 }
2821
2822 work->cm_event.private_data =
2823 IBA_GET_MEM_PTR(CM_DREQ_PRIVATE_DATA, dreq_msg);
2824
2825 spin_lock_irq(&cm_id_priv->lock);
2826 if (cm_id_priv->local_qpn !=
2827 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg)))
2828 goto unlock;
2829
2830 switch (cm_id_priv->id.state) {
2831 case IB_CM_REP_SENT:
2832 case IB_CM_DREQ_SENT:
2833 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2834 break;
2835 case IB_CM_ESTABLISHED:
2836 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2837 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2838 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2839 break;
2840 case IB_CM_MRA_REP_RCVD:
2841 break;
2842 case IB_CM_TIMEWAIT:
2843 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2844 counter[CM_DREQ_COUNTER]);
2845 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
2846 if (IS_ERR(msg))
2847 goto unlock;
2848
2849 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2850 cm_id_priv->private_data,
2851 cm_id_priv->private_data_len);
2852 spin_unlock_irq(&cm_id_priv->lock);
2853
2854 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
2855 ib_post_send_mad(msg, NULL))
2856 cm_free_msg(msg);
2857 goto deref;
2858 case IB_CM_DREQ_RCVD:
2859 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2860 counter[CM_DREQ_COUNTER]);
2861 goto unlock;
2862 default:
2863 trace_icm_dreq_unknown_err(&cm_id_priv->id);
2864 goto unlock;
2865 }
2866 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2867 cm_id_priv->tid = dreq_msg->hdr.tid;
2868 cm_queue_work_unlock(cm_id_priv, work);
2869 return 0;
2870
2871 unlock: spin_unlock_irq(&cm_id_priv->lock);
2872 deref: cm_deref_id(cm_id_priv);
2873 return -EINVAL;
2874 }
2875
cm_drep_handler(struct cm_work * work)2876 static int cm_drep_handler(struct cm_work *work)
2877 {
2878 struct cm_id_private *cm_id_priv;
2879 struct cm_drep_msg *drep_msg;
2880
2881 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2882 cm_id_priv = cm_acquire_id(
2883 cpu_to_be32(IBA_GET(CM_DREP_REMOTE_COMM_ID, drep_msg)),
2884 cpu_to_be32(IBA_GET(CM_DREP_LOCAL_COMM_ID, drep_msg)));
2885 if (!cm_id_priv)
2886 return -EINVAL;
2887
2888 work->cm_event.private_data =
2889 IBA_GET_MEM_PTR(CM_DREP_PRIVATE_DATA, drep_msg);
2890
2891 spin_lock_irq(&cm_id_priv->lock);
2892 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2893 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2894 spin_unlock_irq(&cm_id_priv->lock);
2895 goto out;
2896 }
2897 cm_enter_timewait(cm_id_priv);
2898
2899 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2900 cm_queue_work_unlock(cm_id_priv, work);
2901 return 0;
2902 out:
2903 cm_deref_id(cm_id_priv);
2904 return -EINVAL;
2905 }
2906
cm_send_rej_locked(struct cm_id_private * cm_id_priv,enum ib_cm_rej_reason reason,void * ari,u8 ari_length,const void * private_data,u8 private_data_len)2907 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv,
2908 enum ib_cm_rej_reason reason, void *ari,
2909 u8 ari_length, const void *private_data,
2910 u8 private_data_len)
2911 {
2912 enum ib_cm_state state = cm_id_priv->id.state;
2913 struct ib_mad_send_buf *msg;
2914 int ret;
2915
2916 lockdep_assert_held(&cm_id_priv->lock);
2917
2918 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2919 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2920 return -EINVAL;
2921
2922 switch (state) {
2923 case IB_CM_REQ_SENT:
2924 case IB_CM_MRA_REQ_RCVD:
2925 case IB_CM_REQ_RCVD:
2926 case IB_CM_MRA_REQ_SENT:
2927 case IB_CM_REP_RCVD:
2928 case IB_CM_MRA_REP_SENT:
2929 cm_reset_to_idle(cm_id_priv);
2930 ret = cm_alloc_msg(cm_id_priv, &msg);
2931 if (ret)
2932 return ret;
2933 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason,
2934 ari, ari_length, private_data, private_data_len,
2935 state);
2936 break;
2937 case IB_CM_REP_SENT:
2938 case IB_CM_MRA_REP_RCVD:
2939 cm_enter_timewait(cm_id_priv);
2940 ret = cm_alloc_msg(cm_id_priv, &msg);
2941 if (ret)
2942 return ret;
2943 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason,
2944 ari, ari_length, private_data, private_data_len,
2945 state);
2946 break;
2947 default:
2948 trace_icm_send_unknown_rej_err(&cm_id_priv->id);
2949 return -EINVAL;
2950 }
2951
2952 trace_icm_send_rej(&cm_id_priv->id, reason);
2953 ret = ib_post_send_mad(msg, NULL);
2954 if (ret) {
2955 cm_free_msg(msg);
2956 return ret;
2957 }
2958
2959 return 0;
2960 }
2961
ib_send_cm_rej(struct ib_cm_id * cm_id,enum ib_cm_rej_reason reason,void * ari,u8 ari_length,const void * private_data,u8 private_data_len)2962 int ib_send_cm_rej(struct ib_cm_id *cm_id, enum ib_cm_rej_reason reason,
2963 void *ari, u8 ari_length, const void *private_data,
2964 u8 private_data_len)
2965 {
2966 struct cm_id_private *cm_id_priv =
2967 container_of(cm_id, struct cm_id_private, id);
2968 unsigned long flags;
2969 int ret;
2970
2971 spin_lock_irqsave(&cm_id_priv->lock, flags);
2972 ret = cm_send_rej_locked(cm_id_priv, reason, ari, ari_length,
2973 private_data, private_data_len);
2974 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2975 return ret;
2976 }
2977 EXPORT_SYMBOL(ib_send_cm_rej);
2978
cm_format_rej_event(struct cm_work * work)2979 static void cm_format_rej_event(struct cm_work *work)
2980 {
2981 struct cm_rej_msg *rej_msg;
2982 struct ib_cm_rej_event_param *param;
2983
2984 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2985 param = &work->cm_event.param.rej_rcvd;
2986 param->ari = IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg);
2987 param->ari_length = IBA_GET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg);
2988 param->reason = IBA_GET(CM_REJ_REASON, rej_msg);
2989 work->cm_event.private_data =
2990 IBA_GET_MEM_PTR(CM_REJ_PRIVATE_DATA, rej_msg);
2991 }
2992
cm_acquire_rejected_id(struct cm_rej_msg * rej_msg)2993 static struct cm_id_private *cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2994 {
2995 struct cm_id_private *cm_id_priv;
2996 __be32 remote_id;
2997
2998 remote_id = cpu_to_be32(IBA_GET(CM_REJ_LOCAL_COMM_ID, rej_msg));
2999
3000 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_TIMEOUT) {
3001 cm_id_priv = cm_find_remote_id(
3002 *((__be64 *)IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg)),
3003 remote_id);
3004 } else if (IBA_GET(CM_REJ_MESSAGE_REJECTED, rej_msg) ==
3005 CM_MSG_RESPONSE_REQ)
3006 cm_id_priv = cm_acquire_id(
3007 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)),
3008 0);
3009 else
3010 cm_id_priv = cm_acquire_id(
3011 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)),
3012 remote_id);
3013
3014 return cm_id_priv;
3015 }
3016
cm_rej_handler(struct cm_work * work)3017 static int cm_rej_handler(struct cm_work *work)
3018 {
3019 struct cm_id_private *cm_id_priv;
3020 struct cm_rej_msg *rej_msg;
3021
3022 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
3023 cm_id_priv = cm_acquire_rejected_id(rej_msg);
3024 if (!cm_id_priv)
3025 return -EINVAL;
3026
3027 cm_format_rej_event(work);
3028
3029 spin_lock_irq(&cm_id_priv->lock);
3030 switch (cm_id_priv->id.state) {
3031 case IB_CM_REQ_SENT:
3032 case IB_CM_MRA_REQ_RCVD:
3033 case IB_CM_REP_SENT:
3034 case IB_CM_MRA_REP_RCVD:
3035 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3036 fallthrough;
3037 case IB_CM_REQ_RCVD:
3038 case IB_CM_MRA_REQ_SENT:
3039 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_STALE_CONN)
3040 cm_enter_timewait(cm_id_priv);
3041 else
3042 cm_reset_to_idle(cm_id_priv);
3043 break;
3044 case IB_CM_DREQ_SENT:
3045 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3046 fallthrough;
3047 case IB_CM_REP_RCVD:
3048 case IB_CM_MRA_REP_SENT:
3049 cm_enter_timewait(cm_id_priv);
3050 break;
3051 case IB_CM_ESTABLISHED:
3052 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
3053 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
3054 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
3055 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
3056 cm_id_priv->msg);
3057 cm_enter_timewait(cm_id_priv);
3058 break;
3059 }
3060 fallthrough;
3061 default:
3062 trace_icm_rej_unknown_err(&cm_id_priv->id);
3063 spin_unlock_irq(&cm_id_priv->lock);
3064 goto out;
3065 }
3066
3067 cm_queue_work_unlock(cm_id_priv, work);
3068 return 0;
3069 out:
3070 cm_deref_id(cm_id_priv);
3071 return -EINVAL;
3072 }
3073
ib_send_cm_mra(struct ib_cm_id * cm_id,u8 service_timeout,const void * private_data,u8 private_data_len)3074 int ib_send_cm_mra(struct ib_cm_id *cm_id,
3075 u8 service_timeout,
3076 const void *private_data,
3077 u8 private_data_len)
3078 {
3079 struct cm_id_private *cm_id_priv;
3080 struct ib_mad_send_buf *msg;
3081 enum ib_cm_state cm_state;
3082 enum ib_cm_lap_state lap_state;
3083 enum cm_msg_response msg_response;
3084 void *data;
3085 unsigned long flags;
3086 int ret;
3087
3088 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
3089 return -EINVAL;
3090
3091 data = cm_copy_private_data(private_data, private_data_len);
3092 if (IS_ERR(data))
3093 return PTR_ERR(data);
3094
3095 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3096
3097 spin_lock_irqsave(&cm_id_priv->lock, flags);
3098 switch (cm_id_priv->id.state) {
3099 case IB_CM_REQ_RCVD:
3100 cm_state = IB_CM_MRA_REQ_SENT;
3101 lap_state = cm_id->lap_state;
3102 msg_response = CM_MSG_RESPONSE_REQ;
3103 break;
3104 case IB_CM_REP_RCVD:
3105 cm_state = IB_CM_MRA_REP_SENT;
3106 lap_state = cm_id->lap_state;
3107 msg_response = CM_MSG_RESPONSE_REP;
3108 break;
3109 case IB_CM_ESTABLISHED:
3110 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
3111 cm_state = cm_id->state;
3112 lap_state = IB_CM_MRA_LAP_SENT;
3113 msg_response = CM_MSG_RESPONSE_OTHER;
3114 break;
3115 }
3116 fallthrough;
3117 default:
3118 trace_icm_send_mra_unknown_err(&cm_id_priv->id);
3119 ret = -EINVAL;
3120 goto error1;
3121 }
3122
3123 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
3124 ret = cm_alloc_msg(cm_id_priv, &msg);
3125 if (ret)
3126 goto error1;
3127
3128 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
3129 msg_response, service_timeout,
3130 private_data, private_data_len);
3131 trace_icm_send_mra(cm_id);
3132 ret = ib_post_send_mad(msg, NULL);
3133 if (ret)
3134 goto error2;
3135 }
3136
3137 cm_id->state = cm_state;
3138 cm_id->lap_state = lap_state;
3139 cm_id_priv->service_timeout = service_timeout;
3140 cm_set_private_data(cm_id_priv, data, private_data_len);
3141 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3142 return 0;
3143
3144 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3145 kfree(data);
3146 return ret;
3147
3148 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3149 kfree(data);
3150 cm_free_msg(msg);
3151 return ret;
3152 }
3153 EXPORT_SYMBOL(ib_send_cm_mra);
3154
cm_acquire_mraed_id(struct cm_mra_msg * mra_msg)3155 static struct cm_id_private *cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
3156 {
3157 switch (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg)) {
3158 case CM_MSG_RESPONSE_REQ:
3159 return cm_acquire_id(
3160 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)),
3161 0);
3162 case CM_MSG_RESPONSE_REP:
3163 case CM_MSG_RESPONSE_OTHER:
3164 return cm_acquire_id(
3165 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)),
3166 cpu_to_be32(IBA_GET(CM_MRA_LOCAL_COMM_ID, mra_msg)));
3167 default:
3168 return NULL;
3169 }
3170 }
3171
cm_mra_handler(struct cm_work * work)3172 static int cm_mra_handler(struct cm_work *work)
3173 {
3174 struct cm_id_private *cm_id_priv;
3175 struct cm_mra_msg *mra_msg;
3176 int timeout;
3177
3178 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
3179 cm_id_priv = cm_acquire_mraed_id(mra_msg);
3180 if (!cm_id_priv)
3181 return -EINVAL;
3182
3183 work->cm_event.private_data =
3184 IBA_GET_MEM_PTR(CM_MRA_PRIVATE_DATA, mra_msg);
3185 work->cm_event.param.mra_rcvd.service_timeout =
3186 IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg);
3187 timeout = cm_convert_to_ms(IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg)) +
3188 cm_convert_to_ms(cm_id_priv->av.timeout);
3189
3190 spin_lock_irq(&cm_id_priv->lock);
3191 switch (cm_id_priv->id.state) {
3192 case IB_CM_REQ_SENT:
3193 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3194 CM_MSG_RESPONSE_REQ ||
3195 ib_modify_mad(cm_id_priv->av.port->mad_agent,
3196 cm_id_priv->msg, timeout))
3197 goto out;
3198 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
3199 break;
3200 case IB_CM_REP_SENT:
3201 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3202 CM_MSG_RESPONSE_REP ||
3203 ib_modify_mad(cm_id_priv->av.port->mad_agent,
3204 cm_id_priv->msg, timeout))
3205 goto out;
3206 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
3207 break;
3208 case IB_CM_ESTABLISHED:
3209 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3210 CM_MSG_RESPONSE_OTHER ||
3211 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
3212 ib_modify_mad(cm_id_priv->av.port->mad_agent,
3213 cm_id_priv->msg, timeout)) {
3214 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
3215 atomic_long_inc(&work->port->
3216 counter_group[CM_RECV_DUPLICATES].
3217 counter[CM_MRA_COUNTER]);
3218 goto out;
3219 }
3220 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
3221 break;
3222 case IB_CM_MRA_REQ_RCVD:
3223 case IB_CM_MRA_REP_RCVD:
3224 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3225 counter[CM_MRA_COUNTER]);
3226 fallthrough;
3227 default:
3228 trace_icm_mra_unknown_err(&cm_id_priv->id);
3229 goto out;
3230 }
3231
3232 cm_id_priv->msg->context[1] = (void *) (unsigned long)
3233 cm_id_priv->id.state;
3234 cm_queue_work_unlock(cm_id_priv, work);
3235 return 0;
3236 out:
3237 spin_unlock_irq(&cm_id_priv->lock);
3238 cm_deref_id(cm_id_priv);
3239 return -EINVAL;
3240 }
3241
cm_format_path_lid_from_lap(struct cm_lap_msg * lap_msg,struct sa_path_rec * path)3242 static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg,
3243 struct sa_path_rec *path)
3244 {
3245 u32 lid;
3246
3247 if (path->rec_type != SA_PATH_REC_TYPE_OPA) {
3248 sa_path_set_dlid(path, IBA_GET(CM_LAP_ALTERNATE_LOCAL_PORT_LID,
3249 lap_msg));
3250 sa_path_set_slid(path, IBA_GET(CM_LAP_ALTERNATE_REMOTE_PORT_LID,
3251 lap_msg));
3252 } else {
3253 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
3254 CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg));
3255 sa_path_set_dlid(path, lid);
3256
3257 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
3258 CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg));
3259 sa_path_set_slid(path, lid);
3260 }
3261 }
3262
cm_format_path_from_lap(struct cm_id_private * cm_id_priv,struct sa_path_rec * path,struct cm_lap_msg * lap_msg)3263 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
3264 struct sa_path_rec *path,
3265 struct cm_lap_msg *lap_msg)
3266 {
3267 path->dgid = *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg);
3268 path->sgid =
3269 *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg);
3270 path->flow_label =
3271 cpu_to_be32(IBA_GET(CM_LAP_ALTERNATE_FLOW_LABEL, lap_msg));
3272 path->hop_limit = IBA_GET(CM_LAP_ALTERNATE_HOP_LIMIT, lap_msg);
3273 path->traffic_class = IBA_GET(CM_LAP_ALTERNATE_TRAFFIC_CLASS, lap_msg);
3274 path->reversible = 1;
3275 path->pkey = cm_id_priv->pkey;
3276 path->sl = IBA_GET(CM_LAP_ALTERNATE_SL, lap_msg);
3277 path->mtu_selector = IB_SA_EQ;
3278 path->mtu = cm_id_priv->path_mtu;
3279 path->rate_selector = IB_SA_EQ;
3280 path->rate = IBA_GET(CM_LAP_ALTERNATE_PACKET_RATE, lap_msg);
3281 path->packet_life_time_selector = IB_SA_EQ;
3282 path->packet_life_time =
3283 IBA_GET(CM_LAP_ALTERNATE_LOCAL_ACK_TIMEOUT, lap_msg);
3284 path->packet_life_time -= (path->packet_life_time > 0);
3285 cm_format_path_lid_from_lap(lap_msg, path);
3286 }
3287
cm_lap_handler(struct cm_work * work)3288 static int cm_lap_handler(struct cm_work *work)
3289 {
3290 struct cm_id_private *cm_id_priv;
3291 struct cm_lap_msg *lap_msg;
3292 struct ib_cm_lap_event_param *param;
3293 struct ib_mad_send_buf *msg = NULL;
3294 int ret;
3295
3296 /* Currently Alternate path messages are not supported for
3297 * RoCE link layer.
3298 */
3299 if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3300 work->port->port_num))
3301 return -EINVAL;
3302
3303 /* todo: verify LAP request and send reject APR if invalid. */
3304 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
3305 cm_id_priv = cm_acquire_id(
3306 cpu_to_be32(IBA_GET(CM_LAP_REMOTE_COMM_ID, lap_msg)),
3307 cpu_to_be32(IBA_GET(CM_LAP_LOCAL_COMM_ID, lap_msg)));
3308 if (!cm_id_priv)
3309 return -EINVAL;
3310
3311 param = &work->cm_event.param.lap_rcvd;
3312 memset(&work->path[0], 0, sizeof(work->path[1]));
3313 cm_path_set_rec_type(work->port->cm_dev->ib_device,
3314 work->port->port_num, &work->path[0],
3315 IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID,
3316 lap_msg));
3317 param->alternate_path = &work->path[0];
3318 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
3319 work->cm_event.private_data =
3320 IBA_GET_MEM_PTR(CM_LAP_PRIVATE_DATA, lap_msg);
3321
3322 spin_lock_irq(&cm_id_priv->lock);
3323 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
3324 goto unlock;
3325
3326 switch (cm_id_priv->id.lap_state) {
3327 case IB_CM_LAP_UNINIT:
3328 case IB_CM_LAP_IDLE:
3329 break;
3330 case IB_CM_MRA_LAP_SENT:
3331 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3332 counter[CM_LAP_COUNTER]);
3333 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
3334 if (IS_ERR(msg))
3335 goto unlock;
3336
3337 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
3338 CM_MSG_RESPONSE_OTHER,
3339 cm_id_priv->service_timeout,
3340 cm_id_priv->private_data,
3341 cm_id_priv->private_data_len);
3342 spin_unlock_irq(&cm_id_priv->lock);
3343
3344 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
3345 ib_post_send_mad(msg, NULL))
3346 cm_free_msg(msg);
3347 goto deref;
3348 case IB_CM_LAP_RCVD:
3349 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3350 counter[CM_LAP_COUNTER]);
3351 goto unlock;
3352 default:
3353 goto unlock;
3354 }
3355
3356 ret = cm_init_av_for_lap(work->port, work->mad_recv_wc->wc,
3357 work->mad_recv_wc->recv_buf.grh,
3358 &cm_id_priv->av);
3359 if (ret)
3360 goto unlock;
3361
3362 ret = cm_init_av_by_path(param->alternate_path, NULL,
3363 &cm_id_priv->alt_av, cm_id_priv);
3364 if (ret)
3365 goto unlock;
3366
3367 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
3368 cm_id_priv->tid = lap_msg->hdr.tid;
3369 cm_queue_work_unlock(cm_id_priv, work);
3370 return 0;
3371
3372 unlock: spin_unlock_irq(&cm_id_priv->lock);
3373 deref: cm_deref_id(cm_id_priv);
3374 return -EINVAL;
3375 }
3376
cm_apr_handler(struct cm_work * work)3377 static int cm_apr_handler(struct cm_work *work)
3378 {
3379 struct cm_id_private *cm_id_priv;
3380 struct cm_apr_msg *apr_msg;
3381
3382 /* Currently Alternate path messages are not supported for
3383 * RoCE link layer.
3384 */
3385 if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3386 work->port->port_num))
3387 return -EINVAL;
3388
3389 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
3390 cm_id_priv = cm_acquire_id(
3391 cpu_to_be32(IBA_GET(CM_APR_REMOTE_COMM_ID, apr_msg)),
3392 cpu_to_be32(IBA_GET(CM_APR_LOCAL_COMM_ID, apr_msg)));
3393 if (!cm_id_priv)
3394 return -EINVAL; /* Unmatched reply. */
3395
3396 work->cm_event.param.apr_rcvd.ap_status =
3397 IBA_GET(CM_APR_AR_STATUS, apr_msg);
3398 work->cm_event.param.apr_rcvd.apr_info =
3399 IBA_GET_MEM_PTR(CM_APR_ADDITIONAL_INFORMATION, apr_msg);
3400 work->cm_event.param.apr_rcvd.info_len =
3401 IBA_GET(CM_APR_ADDITIONAL_INFORMATION_LENGTH, apr_msg);
3402 work->cm_event.private_data =
3403 IBA_GET_MEM_PTR(CM_APR_PRIVATE_DATA, apr_msg);
3404
3405 spin_lock_irq(&cm_id_priv->lock);
3406 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
3407 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
3408 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
3409 spin_unlock_irq(&cm_id_priv->lock);
3410 goto out;
3411 }
3412 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
3413 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3414 cm_id_priv->msg = NULL;
3415 cm_queue_work_unlock(cm_id_priv, work);
3416 return 0;
3417 out:
3418 cm_deref_id(cm_id_priv);
3419 return -EINVAL;
3420 }
3421
cm_timewait_handler(struct cm_work * work)3422 static int cm_timewait_handler(struct cm_work *work)
3423 {
3424 struct cm_timewait_info *timewait_info;
3425 struct cm_id_private *cm_id_priv;
3426
3427 timewait_info = container_of(work, struct cm_timewait_info, work);
3428 spin_lock_irq(&cm.lock);
3429 list_del(&timewait_info->list);
3430 spin_unlock_irq(&cm.lock);
3431
3432 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
3433 timewait_info->work.remote_id);
3434 if (!cm_id_priv)
3435 return -EINVAL;
3436
3437 spin_lock_irq(&cm_id_priv->lock);
3438 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
3439 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
3440 spin_unlock_irq(&cm_id_priv->lock);
3441 goto out;
3442 }
3443 cm_id_priv->id.state = IB_CM_IDLE;
3444 cm_queue_work_unlock(cm_id_priv, work);
3445 return 0;
3446 out:
3447 cm_deref_id(cm_id_priv);
3448 return -EINVAL;
3449 }
3450
cm_format_sidr_req(struct cm_sidr_req_msg * sidr_req_msg,struct cm_id_private * cm_id_priv,struct ib_cm_sidr_req_param * param)3451 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
3452 struct cm_id_private *cm_id_priv,
3453 struct ib_cm_sidr_req_param *param)
3454 {
3455 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
3456 cm_form_tid(cm_id_priv));
3457 IBA_SET(CM_SIDR_REQ_REQUESTID, sidr_req_msg,
3458 be32_to_cpu(cm_id_priv->id.local_id));
3459 IBA_SET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg,
3460 be16_to_cpu(param->path->pkey));
3461 IBA_SET(CM_SIDR_REQ_SERVICEID, sidr_req_msg,
3462 be64_to_cpu(param->service_id));
3463
3464 if (param->private_data && param->private_data_len)
3465 IBA_SET_MEM(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg,
3466 param->private_data, param->private_data_len);
3467 }
3468
ib_send_cm_sidr_req(struct ib_cm_id * cm_id,struct ib_cm_sidr_req_param * param)3469 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
3470 struct ib_cm_sidr_req_param *param)
3471 {
3472 struct cm_id_private *cm_id_priv;
3473 struct ib_mad_send_buf *msg;
3474 unsigned long flags;
3475 int ret;
3476
3477 if (!param->path || (param->private_data &&
3478 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
3479 return -EINVAL;
3480
3481 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3482 ret = cm_init_av_by_path(param->path, param->sgid_attr,
3483 &cm_id_priv->av,
3484 cm_id_priv);
3485 if (ret)
3486 goto out;
3487
3488 cm_id->service_id = param->service_id;
3489 cm_id->service_mask = ~cpu_to_be64(0);
3490 cm_id_priv->timeout_ms = param->timeout_ms;
3491 cm_id_priv->max_cm_retries = param->max_cm_retries;
3492 ret = cm_alloc_msg(cm_id_priv, &msg);
3493 if (ret)
3494 goto out;
3495
3496 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
3497 param);
3498 msg->timeout_ms = cm_id_priv->timeout_ms;
3499 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
3500
3501 spin_lock_irqsave(&cm_id_priv->lock, flags);
3502 if (cm_id->state == IB_CM_IDLE) {
3503 trace_icm_send_sidr_req(&cm_id_priv->id);
3504 ret = ib_post_send_mad(msg, NULL);
3505 } else {
3506 ret = -EINVAL;
3507 }
3508
3509 if (ret) {
3510 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3511 cm_free_msg(msg);
3512 goto out;
3513 }
3514 cm_id->state = IB_CM_SIDR_REQ_SENT;
3515 cm_id_priv->msg = msg;
3516 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3517 out:
3518 return ret;
3519 }
3520 EXPORT_SYMBOL(ib_send_cm_sidr_req);
3521
cm_format_sidr_req_event(struct cm_work * work,const struct cm_id_private * rx_cm_id,struct ib_cm_id * listen_id)3522 static void cm_format_sidr_req_event(struct cm_work *work,
3523 const struct cm_id_private *rx_cm_id,
3524 struct ib_cm_id *listen_id)
3525 {
3526 struct cm_sidr_req_msg *sidr_req_msg;
3527 struct ib_cm_sidr_req_event_param *param;
3528
3529 sidr_req_msg = (struct cm_sidr_req_msg *)
3530 work->mad_recv_wc->recv_buf.mad;
3531 param = &work->cm_event.param.sidr_req_rcvd;
3532 param->pkey = IBA_GET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg);
3533 param->listen_id = listen_id;
3534 param->service_id =
3535 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg));
3536 param->bth_pkey = cm_get_bth_pkey(work);
3537 param->port = work->port->port_num;
3538 param->sgid_attr = rx_cm_id->av.ah_attr.grh.sgid_attr;
3539 work->cm_event.private_data =
3540 IBA_GET_MEM_PTR(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg);
3541 }
3542
cm_sidr_req_handler(struct cm_work * work)3543 static int cm_sidr_req_handler(struct cm_work *work)
3544 {
3545 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
3546 struct cm_sidr_req_msg *sidr_req_msg;
3547 struct ib_wc *wc;
3548 int ret;
3549
3550 cm_id_priv =
3551 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL);
3552 if (IS_ERR(cm_id_priv))
3553 return PTR_ERR(cm_id_priv);
3554
3555 /* Record SGID/SLID and request ID for lookup. */
3556 sidr_req_msg = (struct cm_sidr_req_msg *)
3557 work->mad_recv_wc->recv_buf.mad;
3558
3559 cm_id_priv->id.remote_id =
3560 cpu_to_be32(IBA_GET(CM_SIDR_REQ_REQUESTID, sidr_req_msg));
3561 cm_id_priv->id.service_id =
3562 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg));
3563 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3564 cm_id_priv->tid = sidr_req_msg->hdr.tid;
3565
3566 wc = work->mad_recv_wc->wc;
3567 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
3568 cm_id_priv->av.dgid.global.interface_id = 0;
3569 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
3570 work->mad_recv_wc->recv_buf.grh,
3571 &cm_id_priv->av);
3572 if (ret)
3573 goto out;
3574
3575 spin_lock_irq(&cm.lock);
3576 listen_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3577 if (listen_cm_id_priv) {
3578 spin_unlock_irq(&cm.lock);
3579 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3580 counter[CM_SIDR_REQ_COUNTER]);
3581 goto out; /* Duplicate message. */
3582 }
3583 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3584 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
3585 cm_id_priv->id.service_id);
3586 if (!listen_cm_id_priv) {
3587 spin_unlock_irq(&cm.lock);
3588 ib_send_cm_sidr_rep(&cm_id_priv->id,
3589 &(struct ib_cm_sidr_rep_param){
3590 .status = IB_SIDR_UNSUPPORTED });
3591 goto out; /* No match. */
3592 }
3593 spin_unlock_irq(&cm.lock);
3594
3595 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
3596 cm_id_priv->id.context = listen_cm_id_priv->id.context;
3597
3598 /*
3599 * A SIDR ID does not need to be in the xarray since it does not receive
3600 * mads, is not placed in the remote_id or remote_qpn rbtree, and does
3601 * not enter timewait.
3602 */
3603
3604 cm_format_sidr_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
3605 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
3606 cm_free_work(work);
3607 /*
3608 * A pointer to the listen_cm_id is held in the event, so this deref
3609 * must be after the event is delivered above.
3610 */
3611 cm_deref_id(listen_cm_id_priv);
3612 if (ret)
3613 cm_destroy_id(&cm_id_priv->id, ret);
3614 return 0;
3615 out:
3616 ib_destroy_cm_id(&cm_id_priv->id);
3617 return -EINVAL;
3618 }
3619
cm_format_sidr_rep(struct cm_sidr_rep_msg * sidr_rep_msg,struct cm_id_private * cm_id_priv,struct ib_cm_sidr_rep_param * param)3620 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3621 struct cm_id_private *cm_id_priv,
3622 struct ib_cm_sidr_rep_param *param)
3623 {
3624 cm_format_mad_ece_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3625 cm_id_priv->tid, param->ece.attr_mod);
3626 IBA_SET(CM_SIDR_REP_REQUESTID, sidr_rep_msg,
3627 be32_to_cpu(cm_id_priv->id.remote_id));
3628 IBA_SET(CM_SIDR_REP_STATUS, sidr_rep_msg, param->status);
3629 IBA_SET(CM_SIDR_REP_QPN, sidr_rep_msg, param->qp_num);
3630 IBA_SET(CM_SIDR_REP_SERVICEID, sidr_rep_msg,
3631 be64_to_cpu(cm_id_priv->id.service_id));
3632 IBA_SET(CM_SIDR_REP_Q_KEY, sidr_rep_msg, param->qkey);
3633 IBA_SET(CM_SIDR_REP_VENDOR_ID_L, sidr_rep_msg,
3634 param->ece.vendor_id & 0xFF);
3635 IBA_SET(CM_SIDR_REP_VENDOR_ID_H, sidr_rep_msg,
3636 (param->ece.vendor_id >> 8) & 0xFF);
3637
3638 if (param->info && param->info_length)
3639 IBA_SET_MEM(CM_SIDR_REP_ADDITIONAL_INFORMATION, sidr_rep_msg,
3640 param->info, param->info_length);
3641
3642 if (param->private_data && param->private_data_len)
3643 IBA_SET_MEM(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg,
3644 param->private_data, param->private_data_len);
3645 }
3646
cm_send_sidr_rep_locked(struct cm_id_private * cm_id_priv,struct ib_cm_sidr_rep_param * param)3647 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv,
3648 struct ib_cm_sidr_rep_param *param)
3649 {
3650 struct ib_mad_send_buf *msg;
3651 unsigned long flags;
3652 int ret;
3653
3654 lockdep_assert_held(&cm_id_priv->lock);
3655
3656 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3657 (param->private_data &&
3658 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3659 return -EINVAL;
3660
3661 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_RCVD)
3662 return -EINVAL;
3663
3664 ret = cm_alloc_msg(cm_id_priv, &msg);
3665 if (ret)
3666 return ret;
3667
3668 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3669 param);
3670 trace_icm_send_sidr_rep(&cm_id_priv->id);
3671 ret = ib_post_send_mad(msg, NULL);
3672 if (ret) {
3673 cm_free_msg(msg);
3674 return ret;
3675 }
3676 cm_id_priv->id.state = IB_CM_IDLE;
3677 spin_lock_irqsave(&cm.lock, flags);
3678 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) {
3679 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3680 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
3681 }
3682 spin_unlock_irqrestore(&cm.lock, flags);
3683 return 0;
3684 }
3685
ib_send_cm_sidr_rep(struct ib_cm_id * cm_id,struct ib_cm_sidr_rep_param * param)3686 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3687 struct ib_cm_sidr_rep_param *param)
3688 {
3689 struct cm_id_private *cm_id_priv =
3690 container_of(cm_id, struct cm_id_private, id);
3691 unsigned long flags;
3692 int ret;
3693
3694 spin_lock_irqsave(&cm_id_priv->lock, flags);
3695 ret = cm_send_sidr_rep_locked(cm_id_priv, param);
3696 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3697 return ret;
3698 }
3699 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3700
cm_format_sidr_rep_event(struct cm_work * work,const struct cm_id_private * cm_id_priv)3701 static void cm_format_sidr_rep_event(struct cm_work *work,
3702 const struct cm_id_private *cm_id_priv)
3703 {
3704 struct cm_sidr_rep_msg *sidr_rep_msg;
3705 struct ib_cm_sidr_rep_event_param *param;
3706
3707 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3708 work->mad_recv_wc->recv_buf.mad;
3709 param = &work->cm_event.param.sidr_rep_rcvd;
3710 param->status = IBA_GET(CM_SIDR_REP_STATUS, sidr_rep_msg);
3711 param->qkey = IBA_GET(CM_SIDR_REP_Q_KEY, sidr_rep_msg);
3712 param->qpn = IBA_GET(CM_SIDR_REP_QPN, sidr_rep_msg);
3713 param->info = IBA_GET_MEM_PTR(CM_SIDR_REP_ADDITIONAL_INFORMATION,
3714 sidr_rep_msg);
3715 param->info_len = IBA_GET(CM_SIDR_REP_ADDITIONAL_INFORMATION_LENGTH,
3716 sidr_rep_msg);
3717 param->sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
3718 work->cm_event.private_data =
3719 IBA_GET_MEM_PTR(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg);
3720 }
3721
cm_sidr_rep_handler(struct cm_work * work)3722 static int cm_sidr_rep_handler(struct cm_work *work)
3723 {
3724 struct cm_sidr_rep_msg *sidr_rep_msg;
3725 struct cm_id_private *cm_id_priv;
3726
3727 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3728 work->mad_recv_wc->recv_buf.mad;
3729 cm_id_priv = cm_acquire_id(
3730 cpu_to_be32(IBA_GET(CM_SIDR_REP_REQUESTID, sidr_rep_msg)), 0);
3731 if (!cm_id_priv)
3732 return -EINVAL; /* Unmatched reply. */
3733
3734 spin_lock_irq(&cm_id_priv->lock);
3735 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3736 spin_unlock_irq(&cm_id_priv->lock);
3737 goto out;
3738 }
3739 cm_id_priv->id.state = IB_CM_IDLE;
3740 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3741 spin_unlock_irq(&cm_id_priv->lock);
3742
3743 cm_format_sidr_rep_event(work, cm_id_priv);
3744 cm_process_work(cm_id_priv, work);
3745 return 0;
3746 out:
3747 cm_deref_id(cm_id_priv);
3748 return -EINVAL;
3749 }
3750
cm_process_send_error(struct ib_mad_send_buf * msg,enum ib_wc_status wc_status)3751 static void cm_process_send_error(struct ib_mad_send_buf *msg,
3752 enum ib_wc_status wc_status)
3753 {
3754 struct cm_id_private *cm_id_priv;
3755 struct ib_cm_event cm_event;
3756 enum ib_cm_state state;
3757 int ret;
3758
3759 memset(&cm_event, 0, sizeof cm_event);
3760 cm_id_priv = msg->context[0];
3761
3762 /* Discard old sends or ones without a response. */
3763 spin_lock_irq(&cm_id_priv->lock);
3764 state = (enum ib_cm_state) (unsigned long) msg->context[1];
3765 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3766 goto discard;
3767
3768 trace_icm_mad_send_err(state, wc_status);
3769 switch (state) {
3770 case IB_CM_REQ_SENT:
3771 case IB_CM_MRA_REQ_RCVD:
3772 cm_reset_to_idle(cm_id_priv);
3773 cm_event.event = IB_CM_REQ_ERROR;
3774 break;
3775 case IB_CM_REP_SENT:
3776 case IB_CM_MRA_REP_RCVD:
3777 cm_reset_to_idle(cm_id_priv);
3778 cm_event.event = IB_CM_REP_ERROR;
3779 break;
3780 case IB_CM_DREQ_SENT:
3781 cm_enter_timewait(cm_id_priv);
3782 cm_event.event = IB_CM_DREQ_ERROR;
3783 break;
3784 case IB_CM_SIDR_REQ_SENT:
3785 cm_id_priv->id.state = IB_CM_IDLE;
3786 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3787 break;
3788 default:
3789 goto discard;
3790 }
3791 spin_unlock_irq(&cm_id_priv->lock);
3792 cm_event.param.send_status = wc_status;
3793
3794 /* No other events can occur on the cm_id at this point. */
3795 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3796 cm_free_msg(msg);
3797 if (ret)
3798 ib_destroy_cm_id(&cm_id_priv->id);
3799 return;
3800 discard:
3801 spin_unlock_irq(&cm_id_priv->lock);
3802 cm_free_msg(msg);
3803 }
3804
cm_send_handler(struct ib_mad_agent * mad_agent,struct ib_mad_send_wc * mad_send_wc)3805 static void cm_send_handler(struct ib_mad_agent *mad_agent,
3806 struct ib_mad_send_wc *mad_send_wc)
3807 {
3808 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3809 struct cm_port *port;
3810 u16 attr_index;
3811
3812 port = mad_agent->context;
3813 attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3814 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3815
3816 /*
3817 * If the send was in response to a received message (context[0] is not
3818 * set to a cm_id), and is not a REJ, then it is a send that was
3819 * manually retried.
3820 */
3821 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3822 msg->retries = 1;
3823
3824 atomic_long_add(1 + msg->retries,
3825 &port->counter_group[CM_XMIT].counter[attr_index]);
3826 if (msg->retries)
3827 atomic_long_add(msg->retries,
3828 &port->counter_group[CM_XMIT_RETRIES].
3829 counter[attr_index]);
3830
3831 switch (mad_send_wc->status) {
3832 case IB_WC_SUCCESS:
3833 case IB_WC_WR_FLUSH_ERR:
3834 cm_free_msg(msg);
3835 break;
3836 default:
3837 if (msg->context[0] && msg->context[1])
3838 cm_process_send_error(msg, mad_send_wc->status);
3839 else
3840 cm_free_msg(msg);
3841 break;
3842 }
3843 }
3844
cm_work_handler(struct work_struct * _work)3845 static void cm_work_handler(struct work_struct *_work)
3846 {
3847 struct cm_work *work = container_of(_work, struct cm_work, work.work);
3848 int ret;
3849
3850 switch (work->cm_event.event) {
3851 case IB_CM_REQ_RECEIVED:
3852 ret = cm_req_handler(work);
3853 break;
3854 case IB_CM_MRA_RECEIVED:
3855 ret = cm_mra_handler(work);
3856 break;
3857 case IB_CM_REJ_RECEIVED:
3858 ret = cm_rej_handler(work);
3859 break;
3860 case IB_CM_REP_RECEIVED:
3861 ret = cm_rep_handler(work);
3862 break;
3863 case IB_CM_RTU_RECEIVED:
3864 ret = cm_rtu_handler(work);
3865 break;
3866 case IB_CM_USER_ESTABLISHED:
3867 ret = cm_establish_handler(work);
3868 break;
3869 case IB_CM_DREQ_RECEIVED:
3870 ret = cm_dreq_handler(work);
3871 break;
3872 case IB_CM_DREP_RECEIVED:
3873 ret = cm_drep_handler(work);
3874 break;
3875 case IB_CM_SIDR_REQ_RECEIVED:
3876 ret = cm_sidr_req_handler(work);
3877 break;
3878 case IB_CM_SIDR_REP_RECEIVED:
3879 ret = cm_sidr_rep_handler(work);
3880 break;
3881 case IB_CM_LAP_RECEIVED:
3882 ret = cm_lap_handler(work);
3883 break;
3884 case IB_CM_APR_RECEIVED:
3885 ret = cm_apr_handler(work);
3886 break;
3887 case IB_CM_TIMEWAIT_EXIT:
3888 ret = cm_timewait_handler(work);
3889 break;
3890 default:
3891 trace_icm_handler_err(work->cm_event.event);
3892 ret = -EINVAL;
3893 break;
3894 }
3895 if (ret)
3896 cm_free_work(work);
3897 }
3898
cm_establish(struct ib_cm_id * cm_id)3899 static int cm_establish(struct ib_cm_id *cm_id)
3900 {
3901 struct cm_id_private *cm_id_priv;
3902 struct cm_work *work;
3903 unsigned long flags;
3904 int ret = 0;
3905 struct cm_device *cm_dev;
3906
3907 cm_dev = ib_get_client_data(cm_id->device, &cm_client);
3908 if (!cm_dev)
3909 return -ENODEV;
3910
3911 work = kmalloc(sizeof *work, GFP_ATOMIC);
3912 if (!work)
3913 return -ENOMEM;
3914
3915 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3916 spin_lock_irqsave(&cm_id_priv->lock, flags);
3917 switch (cm_id->state) {
3918 case IB_CM_REP_SENT:
3919 case IB_CM_MRA_REP_RCVD:
3920 cm_id->state = IB_CM_ESTABLISHED;
3921 break;
3922 case IB_CM_ESTABLISHED:
3923 ret = -EISCONN;
3924 break;
3925 default:
3926 trace_icm_establish_err(cm_id);
3927 ret = -EINVAL;
3928 break;
3929 }
3930 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3931
3932 if (ret) {
3933 kfree(work);
3934 goto out;
3935 }
3936
3937 /*
3938 * The CM worker thread may try to destroy the cm_id before it
3939 * can execute this work item. To prevent potential deadlock,
3940 * we need to find the cm_id once we're in the context of the
3941 * worker thread, rather than holding a reference on it.
3942 */
3943 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3944 work->local_id = cm_id->local_id;
3945 work->remote_id = cm_id->remote_id;
3946 work->mad_recv_wc = NULL;
3947 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3948
3949 /* Check if the device started its remove_one */
3950 spin_lock_irqsave(&cm.lock, flags);
3951 if (!cm_dev->going_down) {
3952 queue_delayed_work(cm.wq, &work->work, 0);
3953 } else {
3954 kfree(work);
3955 ret = -ENODEV;
3956 }
3957 spin_unlock_irqrestore(&cm.lock, flags);
3958
3959 out:
3960 return ret;
3961 }
3962
cm_migrate(struct ib_cm_id * cm_id)3963 static int cm_migrate(struct ib_cm_id *cm_id)
3964 {
3965 struct cm_id_private *cm_id_priv;
3966 struct cm_av tmp_av;
3967 unsigned long flags;
3968 int tmp_send_port_not_ready;
3969 int ret = 0;
3970
3971 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3972 spin_lock_irqsave(&cm_id_priv->lock, flags);
3973 if (cm_id->state == IB_CM_ESTABLISHED &&
3974 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3975 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3976 cm_id->lap_state = IB_CM_LAP_IDLE;
3977 /* Swap address vector */
3978 tmp_av = cm_id_priv->av;
3979 cm_id_priv->av = cm_id_priv->alt_av;
3980 cm_id_priv->alt_av = tmp_av;
3981 /* Swap port send ready state */
3982 tmp_send_port_not_ready = cm_id_priv->prim_send_port_not_ready;
3983 cm_id_priv->prim_send_port_not_ready = cm_id_priv->altr_send_port_not_ready;
3984 cm_id_priv->altr_send_port_not_ready = tmp_send_port_not_ready;
3985 } else
3986 ret = -EINVAL;
3987 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3988
3989 return ret;
3990 }
3991
ib_cm_notify(struct ib_cm_id * cm_id,enum ib_event_type event)3992 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3993 {
3994 int ret;
3995
3996 switch (event) {
3997 case IB_EVENT_COMM_EST:
3998 ret = cm_establish(cm_id);
3999 break;
4000 case IB_EVENT_PATH_MIG:
4001 ret = cm_migrate(cm_id);
4002 break;
4003 default:
4004 ret = -EINVAL;
4005 }
4006 return ret;
4007 }
4008 EXPORT_SYMBOL(ib_cm_notify);
4009
cm_recv_handler(struct ib_mad_agent * mad_agent,struct ib_mad_send_buf * send_buf,struct ib_mad_recv_wc * mad_recv_wc)4010 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
4011 struct ib_mad_send_buf *send_buf,
4012 struct ib_mad_recv_wc *mad_recv_wc)
4013 {
4014 struct cm_port *port = mad_agent->context;
4015 struct cm_work *work;
4016 enum ib_cm_event_type event;
4017 bool alt_path = false;
4018 u16 attr_id;
4019 int paths = 0;
4020 int going_down = 0;
4021
4022 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
4023 case CM_REQ_ATTR_ID:
4024 alt_path = cm_req_has_alt_path((struct cm_req_msg *)
4025 mad_recv_wc->recv_buf.mad);
4026 paths = 1 + (alt_path != 0);
4027 event = IB_CM_REQ_RECEIVED;
4028 break;
4029 case CM_MRA_ATTR_ID:
4030 event = IB_CM_MRA_RECEIVED;
4031 break;
4032 case CM_REJ_ATTR_ID:
4033 event = IB_CM_REJ_RECEIVED;
4034 break;
4035 case CM_REP_ATTR_ID:
4036 event = IB_CM_REP_RECEIVED;
4037 break;
4038 case CM_RTU_ATTR_ID:
4039 event = IB_CM_RTU_RECEIVED;
4040 break;
4041 case CM_DREQ_ATTR_ID:
4042 event = IB_CM_DREQ_RECEIVED;
4043 break;
4044 case CM_DREP_ATTR_ID:
4045 event = IB_CM_DREP_RECEIVED;
4046 break;
4047 case CM_SIDR_REQ_ATTR_ID:
4048 event = IB_CM_SIDR_REQ_RECEIVED;
4049 break;
4050 case CM_SIDR_REP_ATTR_ID:
4051 event = IB_CM_SIDR_REP_RECEIVED;
4052 break;
4053 case CM_LAP_ATTR_ID:
4054 paths = 1;
4055 event = IB_CM_LAP_RECEIVED;
4056 break;
4057 case CM_APR_ATTR_ID:
4058 event = IB_CM_APR_RECEIVED;
4059 break;
4060 default:
4061 ib_free_recv_mad(mad_recv_wc);
4062 return;
4063 }
4064
4065 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
4066 atomic_long_inc(&port->counter_group[CM_RECV].
4067 counter[attr_id - CM_ATTR_ID_OFFSET]);
4068
4069 work = kmalloc(struct_size(work, path, paths), GFP_KERNEL);
4070 if (!work) {
4071 ib_free_recv_mad(mad_recv_wc);
4072 return;
4073 }
4074
4075 INIT_DELAYED_WORK(&work->work, cm_work_handler);
4076 work->cm_event.event = event;
4077 work->mad_recv_wc = mad_recv_wc;
4078 work->port = port;
4079
4080 /* Check if the device started its remove_one */
4081 spin_lock_irq(&cm.lock);
4082 if (!port->cm_dev->going_down)
4083 queue_delayed_work(cm.wq, &work->work, 0);
4084 else
4085 going_down = 1;
4086 spin_unlock_irq(&cm.lock);
4087
4088 if (going_down) {
4089 kfree(work);
4090 ib_free_recv_mad(mad_recv_wc);
4091 }
4092 }
4093
cm_init_qp_init_attr(struct cm_id_private * cm_id_priv,struct ib_qp_attr * qp_attr,int * qp_attr_mask)4094 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
4095 struct ib_qp_attr *qp_attr,
4096 int *qp_attr_mask)
4097 {
4098 unsigned long flags;
4099 int ret;
4100
4101 spin_lock_irqsave(&cm_id_priv->lock, flags);
4102 switch (cm_id_priv->id.state) {
4103 case IB_CM_REQ_SENT:
4104 case IB_CM_MRA_REQ_RCVD:
4105 case IB_CM_REQ_RCVD:
4106 case IB_CM_MRA_REQ_SENT:
4107 case IB_CM_REP_RCVD:
4108 case IB_CM_MRA_REP_SENT:
4109 case IB_CM_REP_SENT:
4110 case IB_CM_MRA_REP_RCVD:
4111 case IB_CM_ESTABLISHED:
4112 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
4113 IB_QP_PKEY_INDEX | IB_QP_PORT;
4114 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
4115 if (cm_id_priv->responder_resources)
4116 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
4117 IB_ACCESS_REMOTE_ATOMIC;
4118 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
4119 qp_attr->port_num = cm_id_priv->av.port->port_num;
4120 ret = 0;
4121 break;
4122 default:
4123 trace_icm_qp_init_err(&cm_id_priv->id);
4124 ret = -EINVAL;
4125 break;
4126 }
4127 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4128 return ret;
4129 }
4130
cm_init_qp_rtr_attr(struct cm_id_private * cm_id_priv,struct ib_qp_attr * qp_attr,int * qp_attr_mask)4131 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
4132 struct ib_qp_attr *qp_attr,
4133 int *qp_attr_mask)
4134 {
4135 unsigned long flags;
4136 int ret;
4137
4138 spin_lock_irqsave(&cm_id_priv->lock, flags);
4139 switch (cm_id_priv->id.state) {
4140 case IB_CM_REQ_RCVD:
4141 case IB_CM_MRA_REQ_SENT:
4142 case IB_CM_REP_RCVD:
4143 case IB_CM_MRA_REP_SENT:
4144 case IB_CM_REP_SENT:
4145 case IB_CM_MRA_REP_RCVD:
4146 case IB_CM_ESTABLISHED:
4147 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
4148 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
4149 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
4150 qp_attr->path_mtu = cm_id_priv->path_mtu;
4151 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
4152 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
4153 if (cm_id_priv->qp_type == IB_QPT_RC ||
4154 cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
4155 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
4156 IB_QP_MIN_RNR_TIMER;
4157 qp_attr->max_dest_rd_atomic =
4158 cm_id_priv->responder_resources;
4159 qp_attr->min_rnr_timer = 0;
4160 }
4161 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) {
4162 *qp_attr_mask |= IB_QP_ALT_PATH;
4163 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
4164 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4165 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4166 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4167 }
4168 ret = 0;
4169 break;
4170 default:
4171 trace_icm_qp_rtr_err(&cm_id_priv->id);
4172 ret = -EINVAL;
4173 break;
4174 }
4175 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4176 return ret;
4177 }
4178
cm_init_qp_rts_attr(struct cm_id_private * cm_id_priv,struct ib_qp_attr * qp_attr,int * qp_attr_mask)4179 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
4180 struct ib_qp_attr *qp_attr,
4181 int *qp_attr_mask)
4182 {
4183 unsigned long flags;
4184 int ret;
4185
4186 spin_lock_irqsave(&cm_id_priv->lock, flags);
4187 switch (cm_id_priv->id.state) {
4188 /* Allow transition to RTS before sending REP */
4189 case IB_CM_REQ_RCVD:
4190 case IB_CM_MRA_REQ_SENT:
4191
4192 case IB_CM_REP_RCVD:
4193 case IB_CM_MRA_REP_SENT:
4194 case IB_CM_REP_SENT:
4195 case IB_CM_MRA_REP_RCVD:
4196 case IB_CM_ESTABLISHED:
4197 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
4198 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
4199 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
4200 switch (cm_id_priv->qp_type) {
4201 case IB_QPT_RC:
4202 case IB_QPT_XRC_INI:
4203 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
4204 IB_QP_MAX_QP_RD_ATOMIC;
4205 qp_attr->retry_cnt = cm_id_priv->retry_count;
4206 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
4207 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
4208 fallthrough;
4209 case IB_QPT_XRC_TGT:
4210 *qp_attr_mask |= IB_QP_TIMEOUT;
4211 qp_attr->timeout = cm_id_priv->av.timeout;
4212 break;
4213 default:
4214 break;
4215 }
4216 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) {
4217 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
4218 qp_attr->path_mig_state = IB_MIG_REARM;
4219 }
4220 } else {
4221 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
4222 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
4223 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4224 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4225 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4226 qp_attr->path_mig_state = IB_MIG_REARM;
4227 }
4228 ret = 0;
4229 break;
4230 default:
4231 trace_icm_qp_rts_err(&cm_id_priv->id);
4232 ret = -EINVAL;
4233 break;
4234 }
4235 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4236 return ret;
4237 }
4238
ib_cm_init_qp_attr(struct ib_cm_id * cm_id,struct ib_qp_attr * qp_attr,int * qp_attr_mask)4239 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
4240 struct ib_qp_attr *qp_attr,
4241 int *qp_attr_mask)
4242 {
4243 struct cm_id_private *cm_id_priv;
4244 int ret;
4245
4246 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
4247 switch (qp_attr->qp_state) {
4248 case IB_QPS_INIT:
4249 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
4250 break;
4251 case IB_QPS_RTR:
4252 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
4253 break;
4254 case IB_QPS_RTS:
4255 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
4256 break;
4257 default:
4258 ret = -EINVAL;
4259 break;
4260 }
4261 return ret;
4262 }
4263 EXPORT_SYMBOL(ib_cm_init_qp_attr);
4264
cm_show_counter(struct kobject * obj,struct attribute * attr,char * buf)4265 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
4266 char *buf)
4267 {
4268 struct cm_counter_group *group;
4269 struct cm_counter_attribute *cm_attr;
4270
4271 group = container_of(obj, struct cm_counter_group, obj);
4272 cm_attr = container_of(attr, struct cm_counter_attribute, attr);
4273
4274 return sysfs_emit(buf, "%ld\n",
4275 atomic_long_read(&group->counter[cm_attr->index]));
4276 }
4277
4278 static const struct sysfs_ops cm_counter_ops = {
4279 .show = cm_show_counter
4280 };
4281
4282 static struct kobj_type cm_counter_obj_type = {
4283 .sysfs_ops = &cm_counter_ops,
4284 .default_attrs = cm_counter_default_attrs
4285 };
4286
cm_create_port_fs(struct cm_port * port)4287 static int cm_create_port_fs(struct cm_port *port)
4288 {
4289 int i, ret;
4290
4291 for (i = 0; i < CM_COUNTER_GROUPS; i++) {
4292 ret = ib_port_register_module_stat(port->cm_dev->ib_device,
4293 port->port_num,
4294 &port->counter_group[i].obj,
4295 &cm_counter_obj_type,
4296 counter_group_names[i]);
4297 if (ret)
4298 goto error;
4299 }
4300
4301 return 0;
4302
4303 error:
4304 while (i--)
4305 ib_port_unregister_module_stat(&port->counter_group[i].obj);
4306 return ret;
4307
4308 }
4309
cm_remove_port_fs(struct cm_port * port)4310 static void cm_remove_port_fs(struct cm_port *port)
4311 {
4312 int i;
4313
4314 for (i = 0; i < CM_COUNTER_GROUPS; i++)
4315 ib_port_unregister_module_stat(&port->counter_group[i].obj);
4316
4317 }
4318
cm_add_one(struct ib_device * ib_device)4319 static int cm_add_one(struct ib_device *ib_device)
4320 {
4321 struct cm_device *cm_dev;
4322 struct cm_port *port;
4323 struct ib_mad_reg_req reg_req = {
4324 .mgmt_class = IB_MGMT_CLASS_CM,
4325 .mgmt_class_version = IB_CM_CLASS_VERSION,
4326 };
4327 struct ib_port_modify port_modify = {
4328 .set_port_cap_mask = IB_PORT_CM_SUP
4329 };
4330 unsigned long flags;
4331 int ret;
4332 int count = 0;
4333 u32 i;
4334
4335 cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt),
4336 GFP_KERNEL);
4337 if (!cm_dev)
4338 return -ENOMEM;
4339
4340 cm_dev->ib_device = ib_device;
4341 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay;
4342 cm_dev->going_down = 0;
4343
4344 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
4345 rdma_for_each_port (ib_device, i) {
4346 if (!rdma_cap_ib_cm(ib_device, i))
4347 continue;
4348
4349 port = kzalloc(sizeof *port, GFP_KERNEL);
4350 if (!port) {
4351 ret = -ENOMEM;
4352 goto error1;
4353 }
4354
4355 cm_dev->port[i-1] = port;
4356 port->cm_dev = cm_dev;
4357 port->port_num = i;
4358
4359 INIT_LIST_HEAD(&port->cm_priv_prim_list);
4360 INIT_LIST_HEAD(&port->cm_priv_altr_list);
4361
4362 ret = cm_create_port_fs(port);
4363 if (ret)
4364 goto error1;
4365
4366 port->mad_agent = ib_register_mad_agent(ib_device, i,
4367 IB_QPT_GSI,
4368 ®_req,
4369 0,
4370 cm_send_handler,
4371 cm_recv_handler,
4372 port,
4373 0);
4374 if (IS_ERR(port->mad_agent)) {
4375 ret = PTR_ERR(port->mad_agent);
4376 goto error2;
4377 }
4378
4379 ret = ib_modify_port(ib_device, i, 0, &port_modify);
4380 if (ret)
4381 goto error3;
4382
4383 count++;
4384 }
4385
4386 if (!count) {
4387 ret = -EOPNOTSUPP;
4388 goto free;
4389 }
4390
4391 ib_set_client_data(ib_device, &cm_client, cm_dev);
4392
4393 write_lock_irqsave(&cm.device_lock, flags);
4394 list_add_tail(&cm_dev->list, &cm.device_list);
4395 write_unlock_irqrestore(&cm.device_lock, flags);
4396 return 0;
4397
4398 error3:
4399 ib_unregister_mad_agent(port->mad_agent);
4400 error2:
4401 cm_remove_port_fs(port);
4402 error1:
4403 port_modify.set_port_cap_mask = 0;
4404 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
4405 kfree(port);
4406 while (--i) {
4407 if (!rdma_cap_ib_cm(ib_device, i))
4408 continue;
4409
4410 port = cm_dev->port[i-1];
4411 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4412 ib_unregister_mad_agent(port->mad_agent);
4413 cm_remove_port_fs(port);
4414 kfree(port);
4415 }
4416 free:
4417 kfree(cm_dev);
4418 return ret;
4419 }
4420
cm_remove_one(struct ib_device * ib_device,void * client_data)4421 static void cm_remove_one(struct ib_device *ib_device, void *client_data)
4422 {
4423 struct cm_device *cm_dev = client_data;
4424 struct cm_port *port;
4425 struct cm_id_private *cm_id_priv;
4426 struct ib_mad_agent *cur_mad_agent;
4427 struct ib_port_modify port_modify = {
4428 .clr_port_cap_mask = IB_PORT_CM_SUP
4429 };
4430 unsigned long flags;
4431 u32 i;
4432
4433 write_lock_irqsave(&cm.device_lock, flags);
4434 list_del(&cm_dev->list);
4435 write_unlock_irqrestore(&cm.device_lock, flags);
4436
4437 spin_lock_irq(&cm.lock);
4438 cm_dev->going_down = 1;
4439 spin_unlock_irq(&cm.lock);
4440
4441 rdma_for_each_port (ib_device, i) {
4442 if (!rdma_cap_ib_cm(ib_device, i))
4443 continue;
4444
4445 port = cm_dev->port[i-1];
4446 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4447 /* Mark all the cm_id's as not valid */
4448 spin_lock_irq(&cm.lock);
4449 list_for_each_entry(cm_id_priv, &port->cm_priv_altr_list, altr_list)
4450 cm_id_priv->altr_send_port_not_ready = 1;
4451 list_for_each_entry(cm_id_priv, &port->cm_priv_prim_list, prim_list)
4452 cm_id_priv->prim_send_port_not_ready = 1;
4453 spin_unlock_irq(&cm.lock);
4454 /*
4455 * We flush the queue here after the going_down set, this
4456 * verify that no new works will be queued in the recv handler,
4457 * after that we can call the unregister_mad_agent
4458 */
4459 flush_workqueue(cm.wq);
4460 spin_lock_irq(&cm.state_lock);
4461 cur_mad_agent = port->mad_agent;
4462 port->mad_agent = NULL;
4463 spin_unlock_irq(&cm.state_lock);
4464 ib_unregister_mad_agent(cur_mad_agent);
4465 cm_remove_port_fs(port);
4466 kfree(port);
4467 }
4468
4469 kfree(cm_dev);
4470 }
4471
ib_cm_init(void)4472 static int __init ib_cm_init(void)
4473 {
4474 int ret;
4475
4476 INIT_LIST_HEAD(&cm.device_list);
4477 rwlock_init(&cm.device_lock);
4478 spin_lock_init(&cm.lock);
4479 spin_lock_init(&cm.state_lock);
4480 cm.listen_service_table = RB_ROOT;
4481 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
4482 cm.remote_id_table = RB_ROOT;
4483 cm.remote_qp_table = RB_ROOT;
4484 cm.remote_sidr_table = RB_ROOT;
4485 xa_init_flags(&cm.local_id_table, XA_FLAGS_ALLOC);
4486 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
4487 INIT_LIST_HEAD(&cm.timewait_list);
4488
4489 cm.wq = alloc_workqueue("ib_cm", 0, 1);
4490 if (!cm.wq) {
4491 ret = -ENOMEM;
4492 goto error2;
4493 }
4494
4495 ret = ib_register_client(&cm_client);
4496 if (ret)
4497 goto error3;
4498
4499 return 0;
4500 error3:
4501 destroy_workqueue(cm.wq);
4502 error2:
4503 return ret;
4504 }
4505
ib_cm_cleanup(void)4506 static void __exit ib_cm_cleanup(void)
4507 {
4508 struct cm_timewait_info *timewait_info, *tmp;
4509
4510 spin_lock_irq(&cm.lock);
4511 list_for_each_entry(timewait_info, &cm.timewait_list, list)
4512 cancel_delayed_work(&timewait_info->work.work);
4513 spin_unlock_irq(&cm.lock);
4514
4515 ib_unregister_client(&cm_client);
4516 destroy_workqueue(cm.wq);
4517
4518 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
4519 list_del(&timewait_info->list);
4520 kfree(timewait_info);
4521 }
4522
4523 WARN_ON(!xa_empty(&cm.local_id_table));
4524 }
4525
4526 module_init(ib_cm_init);
4527 module_exit(ib_cm_cleanup);
4528