1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB 2 /* 3 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved. 4 * Copyright (c) 2004 Topspin Corporation. All rights reserved. 5 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved. 6 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. 7 * Copyright (c) 2019, Mellanox Technologies inc. All rights reserved. 8 */ 9 10 #include <linux/completion.h> 11 #include <linux/dma-mapping.h> 12 #include <linux/device.h> 13 #include <linux/module.h> 14 #include <linux/err.h> 15 #include <linux/idr.h> 16 #include <linux/interrupt.h> 17 #include <linux/random.h> 18 #include <linux/rbtree.h> 19 #include <linux/spinlock.h> 20 #include <linux/slab.h> 21 #include <linux/sysfs.h> 22 #include <linux/workqueue.h> 23 #include <linux/kdev_t.h> 24 #include <linux/etherdevice.h> 25 26 #include <rdma/ib_cache.h> 27 #include <rdma/ib_cm.h> 28 #include <rdma/ib_sysfs.h> 29 #include "cm_msgs.h" 30 #include "core_priv.h" 31 #include "cm_trace.h" 32 33 MODULE_AUTHOR("Sean Hefty"); 34 MODULE_DESCRIPTION("InfiniBand CM"); 35 MODULE_LICENSE("Dual BSD/GPL"); 36 37 static const char * const ibcm_rej_reason_strs[] = { 38 [IB_CM_REJ_NO_QP] = "no QP", 39 [IB_CM_REJ_NO_EEC] = "no EEC", 40 [IB_CM_REJ_NO_RESOURCES] = "no resources", 41 [IB_CM_REJ_TIMEOUT] = "timeout", 42 [IB_CM_REJ_UNSUPPORTED] = "unsupported", 43 [IB_CM_REJ_INVALID_COMM_ID] = "invalid comm ID", 44 [IB_CM_REJ_INVALID_COMM_INSTANCE] = "invalid comm instance", 45 [IB_CM_REJ_INVALID_SERVICE_ID] = "invalid service ID", 46 [IB_CM_REJ_INVALID_TRANSPORT_TYPE] = "invalid transport type", 47 [IB_CM_REJ_STALE_CONN] = "stale conn", 48 [IB_CM_REJ_RDC_NOT_EXIST] = "RDC not exist", 49 [IB_CM_REJ_INVALID_GID] = "invalid GID", 50 [IB_CM_REJ_INVALID_LID] = "invalid LID", 51 [IB_CM_REJ_INVALID_SL] = "invalid SL", 52 [IB_CM_REJ_INVALID_TRAFFIC_CLASS] = "invalid traffic class", 53 [IB_CM_REJ_INVALID_HOP_LIMIT] = "invalid hop limit", 54 [IB_CM_REJ_INVALID_PACKET_RATE] = "invalid packet rate", 55 [IB_CM_REJ_INVALID_ALT_GID] = "invalid alt GID", 56 [IB_CM_REJ_INVALID_ALT_LID] = "invalid alt LID", 57 [IB_CM_REJ_INVALID_ALT_SL] = "invalid alt SL", 58 [IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS] = "invalid alt traffic class", 59 [IB_CM_REJ_INVALID_ALT_HOP_LIMIT] = "invalid alt hop limit", 60 [IB_CM_REJ_INVALID_ALT_PACKET_RATE] = "invalid alt packet rate", 61 [IB_CM_REJ_PORT_CM_REDIRECT] = "port CM redirect", 62 [IB_CM_REJ_PORT_REDIRECT] = "port redirect", 63 [IB_CM_REJ_INVALID_MTU] = "invalid MTU", 64 [IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES] = "insufficient resp resources", 65 [IB_CM_REJ_CONSUMER_DEFINED] = "consumer defined", 66 [IB_CM_REJ_INVALID_RNR_RETRY] = "invalid RNR retry", 67 [IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID] = "duplicate local comm ID", 68 [IB_CM_REJ_INVALID_CLASS_VERSION] = "invalid class version", 69 [IB_CM_REJ_INVALID_FLOW_LABEL] = "invalid flow label", 70 [IB_CM_REJ_INVALID_ALT_FLOW_LABEL] = "invalid alt flow label", 71 [IB_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED] = 72 "vendor option is not supported", 73 }; 74 75 const char *__attribute_const__ ibcm_reject_msg(int reason) 76 { 77 size_t index = reason; 78 79 if (index < ARRAY_SIZE(ibcm_rej_reason_strs) && 80 ibcm_rej_reason_strs[index]) 81 return ibcm_rej_reason_strs[index]; 82 else 83 return "unrecognized reason"; 84 } 85 EXPORT_SYMBOL(ibcm_reject_msg); 86 87 struct cm_id_private; 88 struct cm_work; 89 static int cm_add_one(struct ib_device *device); 90 static void cm_remove_one(struct ib_device *device, void *client_data); 91 static void cm_process_work(struct cm_id_private *cm_id_priv, 92 struct cm_work *work); 93 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv, 94 struct ib_cm_sidr_rep_param *param); 95 static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv, 96 const void *private_data, u8 private_data_len); 97 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv, 98 void *private_data, u8 private_data_len); 99 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv, 100 enum ib_cm_rej_reason reason, void *ari, 101 u8 ari_length, const void *private_data, 102 u8 private_data_len); 103 104 static struct ib_client cm_client = { 105 .name = "cm", 106 .add = cm_add_one, 107 .remove = cm_remove_one 108 }; 109 110 static struct ib_cm { 111 spinlock_t lock; 112 struct list_head device_list; 113 rwlock_t device_lock; 114 struct rb_root listen_service_table; 115 u64 listen_service_id; 116 /* struct rb_root peer_service_table; todo: fix peer to peer */ 117 struct rb_root remote_qp_table; 118 struct rb_root remote_id_table; 119 struct rb_root remote_sidr_table; 120 struct xarray local_id_table; 121 u32 local_id_next; 122 __be32 random_id_operand; 123 struct list_head timewait_list; 124 struct workqueue_struct *wq; 125 } cm; 126 127 /* Counter indexes ordered by attribute ID */ 128 enum { 129 CM_REQ_COUNTER, 130 CM_MRA_COUNTER, 131 CM_REJ_COUNTER, 132 CM_REP_COUNTER, 133 CM_RTU_COUNTER, 134 CM_DREQ_COUNTER, 135 CM_DREP_COUNTER, 136 CM_SIDR_REQ_COUNTER, 137 CM_SIDR_REP_COUNTER, 138 CM_LAP_COUNTER, 139 CM_APR_COUNTER, 140 CM_ATTR_COUNT, 141 CM_ATTR_ID_OFFSET = 0x0010, 142 }; 143 144 enum { 145 CM_XMIT, 146 CM_XMIT_RETRIES, 147 CM_RECV, 148 CM_RECV_DUPLICATES, 149 CM_COUNTER_GROUPS 150 }; 151 152 struct cm_counter_attribute { 153 struct ib_port_attribute attr; 154 unsigned short group; 155 unsigned short index; 156 }; 157 158 struct cm_port { 159 struct cm_device *cm_dev; 160 struct ib_mad_agent *mad_agent; 161 u32 port_num; 162 atomic_long_t counters[CM_COUNTER_GROUPS][CM_ATTR_COUNT]; 163 }; 164 165 struct cm_device { 166 struct kref kref; 167 struct list_head list; 168 spinlock_t mad_agent_lock; 169 struct ib_device *ib_device; 170 u8 ack_delay; 171 int going_down; 172 struct cm_port *port[]; 173 }; 174 175 struct cm_av { 176 struct cm_port *port; 177 struct rdma_ah_attr ah_attr; 178 u16 pkey_index; 179 u8 timeout; 180 }; 181 182 struct cm_work { 183 struct delayed_work work; 184 struct list_head list; 185 struct cm_port *port; 186 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 187 __be32 local_id; /* Established / timewait */ 188 __be32 remote_id; 189 struct ib_cm_event cm_event; 190 struct sa_path_rec path[]; 191 }; 192 193 struct cm_timewait_info { 194 struct cm_work work; 195 struct list_head list; 196 struct rb_node remote_qp_node; 197 struct rb_node remote_id_node; 198 __be64 remote_ca_guid; 199 __be32 remote_qpn; 200 u8 inserted_remote_qp; 201 u8 inserted_remote_id; 202 }; 203 204 struct cm_id_private { 205 struct ib_cm_id id; 206 207 struct rb_node service_node; 208 struct rb_node sidr_id_node; 209 u32 sidr_slid; 210 spinlock_t lock; /* Do not acquire inside cm.lock */ 211 struct completion comp; 212 refcount_t refcount; 213 /* Number of clients sharing this ib_cm_id. Only valid for listeners. 214 * Protected by the cm.lock spinlock. 215 */ 216 int listen_sharecount; 217 struct rcu_head rcu; 218 219 struct ib_mad_send_buf *msg; 220 struct cm_timewait_info *timewait_info; 221 /* todo: use alternate port on send failure */ 222 struct cm_av av; 223 struct cm_av alt_av; 224 225 void *private_data; 226 __be64 tid; 227 __be32 local_qpn; 228 __be32 remote_qpn; 229 enum ib_qp_type qp_type; 230 __be32 sq_psn; 231 __be32 rq_psn; 232 int timeout_ms; 233 enum ib_mtu path_mtu; 234 __be16 pkey; 235 u8 private_data_len; 236 u8 max_cm_retries; 237 u8 responder_resources; 238 u8 initiator_depth; 239 u8 retry_count; 240 u8 rnr_retry_count; 241 u8 service_timeout; 242 u8 target_ack_delay; 243 244 struct list_head work_list; 245 atomic_t work_count; 246 247 struct rdma_ucm_ece ece; 248 }; 249 250 static void cm_dev_release(struct kref *kref) 251 { 252 struct cm_device *cm_dev = container_of(kref, struct cm_device, kref); 253 u32 i; 254 255 rdma_for_each_port(cm_dev->ib_device, i) 256 kfree(cm_dev->port[i - 1]); 257 258 kfree(cm_dev); 259 } 260 261 static void cm_device_put(struct cm_device *cm_dev) 262 { 263 kref_put(&cm_dev->kref, cm_dev_release); 264 } 265 266 static void cm_work_handler(struct work_struct *work); 267 268 static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 269 { 270 if (refcount_dec_and_test(&cm_id_priv->refcount)) 271 complete(&cm_id_priv->comp); 272 } 273 274 static struct ib_mad_send_buf *cm_alloc_msg(struct cm_id_private *cm_id_priv) 275 { 276 struct ib_mad_agent *mad_agent; 277 struct ib_mad_send_buf *m; 278 struct ib_ah *ah; 279 280 lockdep_assert_held(&cm_id_priv->lock); 281 282 if (!cm_id_priv->av.port) 283 return ERR_PTR(-EINVAL); 284 285 spin_lock(&cm_id_priv->av.port->cm_dev->mad_agent_lock); 286 mad_agent = cm_id_priv->av.port->mad_agent; 287 if (!mad_agent) { 288 m = ERR_PTR(-EINVAL); 289 goto out; 290 } 291 292 ah = rdma_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr, 0); 293 if (IS_ERR(ah)) { 294 m = ERR_CAST(ah); 295 goto out; 296 } 297 298 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 299 cm_id_priv->av.pkey_index, 300 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 301 GFP_ATOMIC, 302 IB_MGMT_BASE_VERSION); 303 if (IS_ERR(m)) { 304 rdma_destroy_ah(ah, 0); 305 goto out; 306 } 307 308 /* Timeout set by caller if response is expected. */ 309 m->ah = ah; 310 m->retries = cm_id_priv->max_cm_retries; 311 312 refcount_inc(&cm_id_priv->refcount); 313 m->context[0] = cm_id_priv; 314 315 out: 316 spin_unlock(&cm_id_priv->av.port->cm_dev->mad_agent_lock); 317 return m; 318 } 319 320 static void cm_free_msg(struct ib_mad_send_buf *msg) 321 { 322 struct cm_id_private *cm_id_priv = msg->context[0]; 323 324 if (msg->ah) 325 rdma_destroy_ah(msg->ah, 0); 326 cm_deref_id(cm_id_priv); 327 ib_free_send_mad(msg); 328 } 329 330 static struct ib_mad_send_buf * 331 cm_alloc_priv_msg(struct cm_id_private *cm_id_priv) 332 { 333 struct ib_mad_send_buf *msg; 334 335 lockdep_assert_held(&cm_id_priv->lock); 336 337 msg = cm_alloc_msg(cm_id_priv); 338 if (IS_ERR(msg)) 339 return msg; 340 cm_id_priv->msg = msg; 341 return msg; 342 } 343 344 static void cm_free_priv_msg(struct ib_mad_send_buf *msg) 345 { 346 struct cm_id_private *cm_id_priv = msg->context[0]; 347 348 lockdep_assert_held(&cm_id_priv->lock); 349 350 if (!WARN_ON(cm_id_priv->msg != msg)) 351 cm_id_priv->msg = NULL; 352 353 if (msg->ah) 354 rdma_destroy_ah(msg->ah, 0); 355 cm_deref_id(cm_id_priv); 356 ib_free_send_mad(msg); 357 } 358 359 static struct ib_mad_send_buf *cm_alloc_response_msg_no_ah(struct cm_port *port, 360 struct ib_mad_recv_wc *mad_recv_wc) 361 { 362 return ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 363 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 364 GFP_ATOMIC, 365 IB_MGMT_BASE_VERSION); 366 } 367 368 static int cm_create_response_msg_ah(struct cm_port *port, 369 struct ib_mad_recv_wc *mad_recv_wc, 370 struct ib_mad_send_buf *msg) 371 { 372 struct ib_ah *ah; 373 374 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 375 mad_recv_wc->recv_buf.grh, port->port_num); 376 if (IS_ERR(ah)) 377 return PTR_ERR(ah); 378 379 msg->ah = ah; 380 return 0; 381 } 382 383 static int cm_alloc_response_msg(struct cm_port *port, 384 struct ib_mad_recv_wc *mad_recv_wc, 385 struct ib_mad_send_buf **msg) 386 { 387 struct ib_mad_send_buf *m; 388 int ret; 389 390 m = cm_alloc_response_msg_no_ah(port, mad_recv_wc); 391 if (IS_ERR(m)) 392 return PTR_ERR(m); 393 394 ret = cm_create_response_msg_ah(port, mad_recv_wc, m); 395 if (ret) { 396 ib_free_send_mad(m); 397 return ret; 398 } 399 400 *msg = m; 401 return 0; 402 } 403 404 static void cm_free_response_msg(struct ib_mad_send_buf *msg) 405 { 406 if (msg->ah) 407 rdma_destroy_ah(msg->ah, 0); 408 ib_free_send_mad(msg); 409 } 410 411 static void *cm_copy_private_data(const void *private_data, u8 private_data_len) 412 { 413 void *data; 414 415 if (!private_data || !private_data_len) 416 return NULL; 417 418 data = kmemdup(private_data, private_data_len, GFP_KERNEL); 419 if (!data) 420 return ERR_PTR(-ENOMEM); 421 422 return data; 423 } 424 425 static void cm_set_private_data(struct cm_id_private *cm_id_priv, 426 void *private_data, u8 private_data_len) 427 { 428 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 429 kfree(cm_id_priv->private_data); 430 431 cm_id_priv->private_data = private_data; 432 cm_id_priv->private_data_len = private_data_len; 433 } 434 435 static void cm_set_av_port(struct cm_av *av, struct cm_port *port) 436 { 437 struct cm_port *old_port = av->port; 438 439 if (old_port == port) 440 return; 441 442 av->port = port; 443 if (old_port) 444 cm_device_put(old_port->cm_dev); 445 if (port) 446 kref_get(&port->cm_dev->kref); 447 } 448 449 static void cm_init_av_for_lap(struct cm_port *port, struct ib_wc *wc, 450 struct rdma_ah_attr *ah_attr, struct cm_av *av) 451 { 452 cm_set_av_port(av, port); 453 av->pkey_index = wc->pkey_index; 454 rdma_move_ah_attr(&av->ah_attr, ah_attr); 455 } 456 457 static int cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 458 struct ib_grh *grh, struct cm_av *av) 459 { 460 cm_set_av_port(av, port); 461 av->pkey_index = wc->pkey_index; 462 return ib_init_ah_attr_from_wc(port->cm_dev->ib_device, 463 port->port_num, wc, 464 grh, &av->ah_attr); 465 } 466 467 static struct cm_port * 468 get_cm_port_from_path(struct sa_path_rec *path, const struct ib_gid_attr *attr) 469 { 470 struct cm_device *cm_dev; 471 struct cm_port *port = NULL; 472 unsigned long flags; 473 474 if (attr) { 475 read_lock_irqsave(&cm.device_lock, flags); 476 list_for_each_entry(cm_dev, &cm.device_list, list) { 477 if (cm_dev->ib_device == attr->device) { 478 port = cm_dev->port[attr->port_num - 1]; 479 break; 480 } 481 } 482 read_unlock_irqrestore(&cm.device_lock, flags); 483 } else { 484 /* SGID attribute can be NULL in following 485 * conditions. 486 * (a) Alternative path 487 * (b) IB link layer without GRH 488 * (c) LAP send messages 489 */ 490 read_lock_irqsave(&cm.device_lock, flags); 491 list_for_each_entry(cm_dev, &cm.device_list, list) { 492 attr = rdma_find_gid(cm_dev->ib_device, 493 &path->sgid, 494 sa_conv_pathrec_to_gid_type(path), 495 NULL); 496 if (!IS_ERR(attr)) { 497 port = cm_dev->port[attr->port_num - 1]; 498 break; 499 } 500 } 501 read_unlock_irqrestore(&cm.device_lock, flags); 502 if (port) 503 rdma_put_gid_attr(attr); 504 } 505 return port; 506 } 507 508 static int cm_init_av_by_path(struct sa_path_rec *path, 509 const struct ib_gid_attr *sgid_attr, 510 struct cm_av *av) 511 { 512 struct rdma_ah_attr new_ah_attr; 513 struct cm_device *cm_dev; 514 struct cm_port *port; 515 int ret; 516 517 port = get_cm_port_from_path(path, sgid_attr); 518 if (!port) 519 return -EINVAL; 520 cm_dev = port->cm_dev; 521 522 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num, 523 be16_to_cpu(path->pkey), &av->pkey_index); 524 if (ret) 525 return ret; 526 527 cm_set_av_port(av, port); 528 529 /* 530 * av->ah_attr might be initialized based on wc or during 531 * request processing time which might have reference to sgid_attr. 532 * So initialize a new ah_attr on stack. 533 * If initialization fails, old ah_attr is used for sending any 534 * responses. If initialization is successful, than new ah_attr 535 * is used by overwriting the old one. So that right ah_attr 536 * can be used to return an error response. 537 */ 538 ret = ib_init_ah_attr_from_path(cm_dev->ib_device, port->port_num, path, 539 &new_ah_attr, sgid_attr); 540 if (ret) 541 return ret; 542 543 av->timeout = path->packet_life_time + 1; 544 rdma_move_ah_attr(&av->ah_attr, &new_ah_attr); 545 return 0; 546 } 547 548 /* Move av created by cm_init_av_by_path(), so av.dgid is not moved */ 549 static void cm_move_av_from_path(struct cm_av *dest, struct cm_av *src) 550 { 551 cm_set_av_port(dest, src->port); 552 cm_set_av_port(src, NULL); 553 dest->pkey_index = src->pkey_index; 554 rdma_move_ah_attr(&dest->ah_attr, &src->ah_attr); 555 dest->timeout = src->timeout; 556 } 557 558 static void cm_destroy_av(struct cm_av *av) 559 { 560 rdma_destroy_ah_attr(&av->ah_attr); 561 cm_set_av_port(av, NULL); 562 } 563 564 static u32 cm_local_id(__be32 local_id) 565 { 566 return (__force u32) (local_id ^ cm.random_id_operand); 567 } 568 569 static struct cm_id_private *cm_acquire_id(__be32 local_id, __be32 remote_id) 570 { 571 struct cm_id_private *cm_id_priv; 572 573 rcu_read_lock(); 574 cm_id_priv = xa_load(&cm.local_id_table, cm_local_id(local_id)); 575 if (!cm_id_priv || cm_id_priv->id.remote_id != remote_id || 576 !refcount_inc_not_zero(&cm_id_priv->refcount)) 577 cm_id_priv = NULL; 578 rcu_read_unlock(); 579 580 return cm_id_priv; 581 } 582 583 /* 584 * Trivial helpers to strip endian annotation and compare; the 585 * endianness doesn't actually matter since we just need a stable 586 * order for the RB tree. 587 */ 588 static int be32_lt(__be32 a, __be32 b) 589 { 590 return (__force u32) a < (__force u32) b; 591 } 592 593 static int be32_gt(__be32 a, __be32 b) 594 { 595 return (__force u32) a > (__force u32) b; 596 } 597 598 static int be64_lt(__be64 a, __be64 b) 599 { 600 return (__force u64) a < (__force u64) b; 601 } 602 603 static int be64_gt(__be64 a, __be64 b) 604 { 605 return (__force u64) a > (__force u64) b; 606 } 607 608 /* 609 * Inserts a new cm_id_priv into the listen_service_table. Returns cm_id_priv 610 * if the new ID was inserted, NULL if it could not be inserted due to a 611 * collision, or the existing cm_id_priv ready for shared usage. 612 */ 613 static struct cm_id_private *cm_insert_listen(struct cm_id_private *cm_id_priv, 614 ib_cm_handler shared_handler) 615 { 616 struct rb_node **link = &cm.listen_service_table.rb_node; 617 struct rb_node *parent = NULL; 618 struct cm_id_private *cur_cm_id_priv; 619 __be64 service_id = cm_id_priv->id.service_id; 620 __be64 service_mask = cm_id_priv->id.service_mask; 621 unsigned long flags; 622 623 spin_lock_irqsave(&cm.lock, flags); 624 while (*link) { 625 parent = *link; 626 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 627 service_node); 628 if ((cur_cm_id_priv->id.service_mask & service_id) == 629 (service_mask & cur_cm_id_priv->id.service_id) && 630 (cm_id_priv->id.device == cur_cm_id_priv->id.device)) { 631 /* 632 * Sharing an ib_cm_id with different handlers is not 633 * supported 634 */ 635 if (cur_cm_id_priv->id.cm_handler != shared_handler || 636 cur_cm_id_priv->id.context || 637 WARN_ON(!cur_cm_id_priv->id.cm_handler)) { 638 spin_unlock_irqrestore(&cm.lock, flags); 639 return NULL; 640 } 641 refcount_inc(&cur_cm_id_priv->refcount); 642 cur_cm_id_priv->listen_sharecount++; 643 spin_unlock_irqrestore(&cm.lock, flags); 644 return cur_cm_id_priv; 645 } 646 647 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 648 link = &(*link)->rb_left; 649 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 650 link = &(*link)->rb_right; 651 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id)) 652 link = &(*link)->rb_left; 653 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id)) 654 link = &(*link)->rb_right; 655 else 656 link = &(*link)->rb_right; 657 } 658 cm_id_priv->listen_sharecount++; 659 rb_link_node(&cm_id_priv->service_node, parent, link); 660 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 661 spin_unlock_irqrestore(&cm.lock, flags); 662 return cm_id_priv; 663 } 664 665 static struct cm_id_private *cm_find_listen(struct ib_device *device, 666 __be64 service_id) 667 { 668 struct rb_node *node = cm.listen_service_table.rb_node; 669 struct cm_id_private *cm_id_priv; 670 671 while (node) { 672 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 673 if ((cm_id_priv->id.service_mask & service_id) == 674 cm_id_priv->id.service_id && 675 (cm_id_priv->id.device == device)) { 676 refcount_inc(&cm_id_priv->refcount); 677 return cm_id_priv; 678 } 679 if (device < cm_id_priv->id.device) 680 node = node->rb_left; 681 else if (device > cm_id_priv->id.device) 682 node = node->rb_right; 683 else if (be64_lt(service_id, cm_id_priv->id.service_id)) 684 node = node->rb_left; 685 else if (be64_gt(service_id, cm_id_priv->id.service_id)) 686 node = node->rb_right; 687 else 688 node = node->rb_right; 689 } 690 return NULL; 691 } 692 693 static struct cm_timewait_info * 694 cm_insert_remote_id(struct cm_timewait_info *timewait_info) 695 { 696 struct rb_node **link = &cm.remote_id_table.rb_node; 697 struct rb_node *parent = NULL; 698 struct cm_timewait_info *cur_timewait_info; 699 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 700 __be32 remote_id = timewait_info->work.remote_id; 701 702 while (*link) { 703 parent = *link; 704 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 705 remote_id_node); 706 if (be32_lt(remote_id, cur_timewait_info->work.remote_id)) 707 link = &(*link)->rb_left; 708 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id)) 709 link = &(*link)->rb_right; 710 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 711 link = &(*link)->rb_left; 712 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 713 link = &(*link)->rb_right; 714 else 715 return cur_timewait_info; 716 } 717 timewait_info->inserted_remote_id = 1; 718 rb_link_node(&timewait_info->remote_id_node, parent, link); 719 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 720 return NULL; 721 } 722 723 static struct cm_id_private *cm_find_remote_id(__be64 remote_ca_guid, 724 __be32 remote_id) 725 { 726 struct rb_node *node = cm.remote_id_table.rb_node; 727 struct cm_timewait_info *timewait_info; 728 struct cm_id_private *res = NULL; 729 730 spin_lock_irq(&cm.lock); 731 while (node) { 732 timewait_info = rb_entry(node, struct cm_timewait_info, 733 remote_id_node); 734 if (be32_lt(remote_id, timewait_info->work.remote_id)) 735 node = node->rb_left; 736 else if (be32_gt(remote_id, timewait_info->work.remote_id)) 737 node = node->rb_right; 738 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid)) 739 node = node->rb_left; 740 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid)) 741 node = node->rb_right; 742 else { 743 res = cm_acquire_id(timewait_info->work.local_id, 744 timewait_info->work.remote_id); 745 break; 746 } 747 } 748 spin_unlock_irq(&cm.lock); 749 return res; 750 } 751 752 static struct cm_timewait_info * 753 cm_insert_remote_qpn(struct cm_timewait_info *timewait_info) 754 { 755 struct rb_node **link = &cm.remote_qp_table.rb_node; 756 struct rb_node *parent = NULL; 757 struct cm_timewait_info *cur_timewait_info; 758 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 759 __be32 remote_qpn = timewait_info->remote_qpn; 760 761 while (*link) { 762 parent = *link; 763 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 764 remote_qp_node); 765 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn)) 766 link = &(*link)->rb_left; 767 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn)) 768 link = &(*link)->rb_right; 769 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 770 link = &(*link)->rb_left; 771 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 772 link = &(*link)->rb_right; 773 else 774 return cur_timewait_info; 775 } 776 timewait_info->inserted_remote_qp = 1; 777 rb_link_node(&timewait_info->remote_qp_node, parent, link); 778 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 779 return NULL; 780 } 781 782 static struct cm_id_private * 783 cm_insert_remote_sidr(struct cm_id_private *cm_id_priv) 784 { 785 struct rb_node **link = &cm.remote_sidr_table.rb_node; 786 struct rb_node *parent = NULL; 787 struct cm_id_private *cur_cm_id_priv; 788 __be32 remote_id = cm_id_priv->id.remote_id; 789 790 while (*link) { 791 parent = *link; 792 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 793 sidr_id_node); 794 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id)) 795 link = &(*link)->rb_left; 796 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id)) 797 link = &(*link)->rb_right; 798 else { 799 if (cur_cm_id_priv->sidr_slid < cm_id_priv->sidr_slid) 800 link = &(*link)->rb_left; 801 else if (cur_cm_id_priv->sidr_slid > cm_id_priv->sidr_slid) 802 link = &(*link)->rb_right; 803 else 804 return cur_cm_id_priv; 805 } 806 } 807 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 808 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 809 return NULL; 810 } 811 812 static struct cm_id_private *cm_alloc_id_priv(struct ib_device *device, 813 ib_cm_handler cm_handler, 814 void *context) 815 { 816 struct cm_id_private *cm_id_priv; 817 u32 id; 818 int ret; 819 820 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 821 if (!cm_id_priv) 822 return ERR_PTR(-ENOMEM); 823 824 cm_id_priv->id.state = IB_CM_IDLE; 825 cm_id_priv->id.device = device; 826 cm_id_priv->id.cm_handler = cm_handler; 827 cm_id_priv->id.context = context; 828 cm_id_priv->id.remote_cm_qpn = 1; 829 830 RB_CLEAR_NODE(&cm_id_priv->service_node); 831 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); 832 spin_lock_init(&cm_id_priv->lock); 833 init_completion(&cm_id_priv->comp); 834 INIT_LIST_HEAD(&cm_id_priv->work_list); 835 atomic_set(&cm_id_priv->work_count, -1); 836 refcount_set(&cm_id_priv->refcount, 1); 837 838 ret = xa_alloc_cyclic(&cm.local_id_table, &id, NULL, xa_limit_32b, 839 &cm.local_id_next, GFP_KERNEL); 840 if (ret < 0) 841 goto error; 842 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand; 843 844 return cm_id_priv; 845 846 error: 847 kfree(cm_id_priv); 848 return ERR_PTR(ret); 849 } 850 851 /* 852 * Make the ID visible to the MAD handlers and other threads that use the 853 * xarray. 854 */ 855 static void cm_finalize_id(struct cm_id_private *cm_id_priv) 856 { 857 xa_store(&cm.local_id_table, cm_local_id(cm_id_priv->id.local_id), 858 cm_id_priv, GFP_ATOMIC); 859 } 860 861 struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 862 ib_cm_handler cm_handler, 863 void *context) 864 { 865 struct cm_id_private *cm_id_priv; 866 867 cm_id_priv = cm_alloc_id_priv(device, cm_handler, context); 868 if (IS_ERR(cm_id_priv)) 869 return ERR_CAST(cm_id_priv); 870 871 cm_finalize_id(cm_id_priv); 872 return &cm_id_priv->id; 873 } 874 EXPORT_SYMBOL(ib_create_cm_id); 875 876 static struct cm_work *cm_dequeue_work(struct cm_id_private *cm_id_priv) 877 { 878 struct cm_work *work; 879 880 if (list_empty(&cm_id_priv->work_list)) 881 return NULL; 882 883 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 884 list_del(&work->list); 885 return work; 886 } 887 888 static void cm_free_work(struct cm_work *work) 889 { 890 if (work->mad_recv_wc) 891 ib_free_recv_mad(work->mad_recv_wc); 892 kfree(work); 893 } 894 895 static void cm_queue_work_unlock(struct cm_id_private *cm_id_priv, 896 struct cm_work *work) 897 __releases(&cm_id_priv->lock) 898 { 899 bool immediate; 900 901 /* 902 * To deliver the event to the user callback we have the drop the 903 * spinlock, however, we need to ensure that the user callback is single 904 * threaded and receives events in the temporal order. If there are 905 * already events being processed then thread new events onto a list, 906 * the thread currently processing will pick them up. 907 */ 908 immediate = atomic_inc_and_test(&cm_id_priv->work_count); 909 if (!immediate) { 910 list_add_tail(&work->list, &cm_id_priv->work_list); 911 /* 912 * This routine always consumes incoming reference. Once queued 913 * to the work_list then a reference is held by the thread 914 * currently running cm_process_work() and this reference is not 915 * needed. 916 */ 917 cm_deref_id(cm_id_priv); 918 } 919 spin_unlock_irq(&cm_id_priv->lock); 920 921 if (immediate) 922 cm_process_work(cm_id_priv, work); 923 } 924 925 static inline int cm_convert_to_ms(int iba_time) 926 { 927 /* approximate conversion to ms from 4.096us x 2^iba_time */ 928 return 1 << max(iba_time - 8, 0); 929 } 930 931 /* 932 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 933 * Because of how ack_timeout is stored, adding one doubles the timeout. 934 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 935 * increment it (round up) only if the other is within 50%. 936 */ 937 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 938 { 939 int ack_timeout = packet_life_time + 1; 940 941 if (ack_timeout >= ca_ack_delay) 942 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 943 else 944 ack_timeout = ca_ack_delay + 945 (ack_timeout >= (ca_ack_delay - 1)); 946 947 return min(31, ack_timeout); 948 } 949 950 static void cm_remove_remote(struct cm_id_private *cm_id_priv) 951 { 952 struct cm_timewait_info *timewait_info = cm_id_priv->timewait_info; 953 954 if (timewait_info->inserted_remote_id) { 955 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 956 timewait_info->inserted_remote_id = 0; 957 } 958 959 if (timewait_info->inserted_remote_qp) { 960 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 961 timewait_info->inserted_remote_qp = 0; 962 } 963 } 964 965 static struct cm_timewait_info *cm_create_timewait_info(__be32 local_id) 966 { 967 struct cm_timewait_info *timewait_info; 968 969 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 970 if (!timewait_info) 971 return ERR_PTR(-ENOMEM); 972 973 timewait_info->work.local_id = local_id; 974 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 975 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 976 return timewait_info; 977 } 978 979 static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 980 { 981 int wait_time; 982 unsigned long flags; 983 struct cm_device *cm_dev; 984 985 lockdep_assert_held(&cm_id_priv->lock); 986 987 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client); 988 if (!cm_dev) 989 return; 990 991 spin_lock_irqsave(&cm.lock, flags); 992 cm_remove_remote(cm_id_priv); 993 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 994 spin_unlock_irqrestore(&cm.lock, flags); 995 996 /* 997 * The cm_id could be destroyed by the user before we exit timewait. 998 * To protect against this, we search for the cm_id after exiting 999 * timewait before notifying the user that we've exited timewait. 1000 */ 1001 cm_id_priv->id.state = IB_CM_TIMEWAIT; 1002 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 1003 1004 /* Check if the device started its remove_one */ 1005 spin_lock_irqsave(&cm.lock, flags); 1006 if (!cm_dev->going_down) 1007 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 1008 msecs_to_jiffies(wait_time)); 1009 spin_unlock_irqrestore(&cm.lock, flags); 1010 1011 /* 1012 * The timewait_info is converted into a work and gets freed during 1013 * cm_free_work() in cm_timewait_handler(). 1014 */ 1015 BUILD_BUG_ON(offsetof(struct cm_timewait_info, work) != 0); 1016 cm_id_priv->timewait_info = NULL; 1017 } 1018 1019 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 1020 { 1021 unsigned long flags; 1022 1023 lockdep_assert_held(&cm_id_priv->lock); 1024 1025 cm_id_priv->id.state = IB_CM_IDLE; 1026 if (cm_id_priv->timewait_info) { 1027 spin_lock_irqsave(&cm.lock, flags); 1028 cm_remove_remote(cm_id_priv); 1029 spin_unlock_irqrestore(&cm.lock, flags); 1030 kfree(cm_id_priv->timewait_info); 1031 cm_id_priv->timewait_info = NULL; 1032 } 1033 } 1034 1035 static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 1036 { 1037 struct cm_id_private *cm_id_priv; 1038 struct cm_work *work; 1039 1040 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1041 spin_lock_irq(&cm_id_priv->lock); 1042 retest: 1043 switch (cm_id->state) { 1044 case IB_CM_LISTEN: 1045 spin_lock(&cm.lock); 1046 if (--cm_id_priv->listen_sharecount > 0) { 1047 /* The id is still shared. */ 1048 WARN_ON(refcount_read(&cm_id_priv->refcount) == 1); 1049 spin_unlock(&cm.lock); 1050 spin_unlock_irq(&cm_id_priv->lock); 1051 cm_deref_id(cm_id_priv); 1052 return; 1053 } 1054 cm_id->state = IB_CM_IDLE; 1055 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 1056 RB_CLEAR_NODE(&cm_id_priv->service_node); 1057 spin_unlock(&cm.lock); 1058 break; 1059 case IB_CM_SIDR_REQ_SENT: 1060 cm_id->state = IB_CM_IDLE; 1061 ib_cancel_mad(cm_id_priv->msg); 1062 break; 1063 case IB_CM_SIDR_REQ_RCVD: 1064 cm_send_sidr_rep_locked(cm_id_priv, 1065 &(struct ib_cm_sidr_rep_param){ 1066 .status = IB_SIDR_REJECT }); 1067 /* cm_send_sidr_rep_locked will not move to IDLE if it fails */ 1068 cm_id->state = IB_CM_IDLE; 1069 break; 1070 case IB_CM_REQ_SENT: 1071 case IB_CM_MRA_REQ_RCVD: 1072 ib_cancel_mad(cm_id_priv->msg); 1073 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_TIMEOUT, 1074 &cm_id_priv->id.device->node_guid, 1075 sizeof(cm_id_priv->id.device->node_guid), 1076 NULL, 0); 1077 break; 1078 case IB_CM_REQ_RCVD: 1079 if (err == -ENOMEM) { 1080 /* Do not reject to allow future retries. */ 1081 cm_reset_to_idle(cm_id_priv); 1082 } else { 1083 cm_send_rej_locked(cm_id_priv, 1084 IB_CM_REJ_CONSUMER_DEFINED, NULL, 0, 1085 NULL, 0); 1086 } 1087 break; 1088 case IB_CM_REP_SENT: 1089 case IB_CM_MRA_REP_RCVD: 1090 ib_cancel_mad(cm_id_priv->msg); 1091 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL, 1092 0, NULL, 0); 1093 goto retest; 1094 case IB_CM_MRA_REQ_SENT: 1095 case IB_CM_REP_RCVD: 1096 case IB_CM_MRA_REP_SENT: 1097 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL, 1098 0, NULL, 0); 1099 break; 1100 case IB_CM_ESTABLISHED: 1101 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 1102 cm_id->state = IB_CM_IDLE; 1103 break; 1104 } 1105 cm_send_dreq_locked(cm_id_priv, NULL, 0); 1106 goto retest; 1107 case IB_CM_DREQ_SENT: 1108 ib_cancel_mad(cm_id_priv->msg); 1109 cm_enter_timewait(cm_id_priv); 1110 goto retest; 1111 case IB_CM_DREQ_RCVD: 1112 cm_send_drep_locked(cm_id_priv, NULL, 0); 1113 WARN_ON(cm_id->state != IB_CM_TIMEWAIT); 1114 goto retest; 1115 case IB_CM_TIMEWAIT: 1116 /* 1117 * The cm_acquire_id in cm_timewait_handler will stop working 1118 * once we do xa_erase below, so just move to idle here for 1119 * consistency. 1120 */ 1121 cm_id->state = IB_CM_IDLE; 1122 break; 1123 case IB_CM_IDLE: 1124 break; 1125 } 1126 WARN_ON(cm_id->state != IB_CM_IDLE); 1127 1128 spin_lock(&cm.lock); 1129 /* Required for cleanup paths related cm_req_handler() */ 1130 if (cm_id_priv->timewait_info) { 1131 cm_remove_remote(cm_id_priv); 1132 kfree(cm_id_priv->timewait_info); 1133 cm_id_priv->timewait_info = NULL; 1134 } 1135 1136 WARN_ON(cm_id_priv->listen_sharecount); 1137 WARN_ON(!RB_EMPTY_NODE(&cm_id_priv->service_node)); 1138 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) 1139 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 1140 spin_unlock(&cm.lock); 1141 spin_unlock_irq(&cm_id_priv->lock); 1142 1143 xa_erase(&cm.local_id_table, cm_local_id(cm_id->local_id)); 1144 cm_deref_id(cm_id_priv); 1145 wait_for_completion(&cm_id_priv->comp); 1146 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 1147 cm_free_work(work); 1148 1149 cm_destroy_av(&cm_id_priv->av); 1150 cm_destroy_av(&cm_id_priv->alt_av); 1151 kfree(cm_id_priv->private_data); 1152 kfree_rcu(cm_id_priv, rcu); 1153 } 1154 1155 void ib_destroy_cm_id(struct ib_cm_id *cm_id) 1156 { 1157 cm_destroy_id(cm_id, 0); 1158 } 1159 EXPORT_SYMBOL(ib_destroy_cm_id); 1160 1161 static int cm_init_listen(struct cm_id_private *cm_id_priv, __be64 service_id, 1162 __be64 service_mask) 1163 { 1164 service_mask = service_mask ? service_mask : ~cpu_to_be64(0); 1165 service_id &= service_mask; 1166 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 1167 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 1168 return -EINVAL; 1169 1170 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 1171 cm_id_priv->id.service_id = cpu_to_be64(cm.listen_service_id++); 1172 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 1173 } else { 1174 cm_id_priv->id.service_id = service_id; 1175 cm_id_priv->id.service_mask = service_mask; 1176 } 1177 return 0; 1178 } 1179 1180 /** 1181 * ib_cm_listen - Initiates listening on the specified service ID for 1182 * connection and service ID resolution requests. 1183 * @cm_id: Connection identifier associated with the listen request. 1184 * @service_id: Service identifier matched against incoming connection 1185 * and service ID resolution requests. The service ID should be specified 1186 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1187 * assign a service ID to the caller. 1188 * @service_mask: Mask applied to service ID used to listen across a 1189 * range of service IDs. If set to 0, the service ID is matched 1190 * exactly. This parameter is ignored if %service_id is set to 1191 * IB_CM_ASSIGN_SERVICE_ID. 1192 */ 1193 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask) 1194 { 1195 struct cm_id_private *cm_id_priv = 1196 container_of(cm_id, struct cm_id_private, id); 1197 unsigned long flags; 1198 int ret; 1199 1200 spin_lock_irqsave(&cm_id_priv->lock, flags); 1201 if (cm_id_priv->id.state != IB_CM_IDLE) { 1202 ret = -EINVAL; 1203 goto out; 1204 } 1205 1206 ret = cm_init_listen(cm_id_priv, service_id, service_mask); 1207 if (ret) 1208 goto out; 1209 1210 if (!cm_insert_listen(cm_id_priv, NULL)) { 1211 ret = -EBUSY; 1212 goto out; 1213 } 1214 1215 cm_id_priv->id.state = IB_CM_LISTEN; 1216 ret = 0; 1217 1218 out: 1219 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1220 return ret; 1221 } 1222 EXPORT_SYMBOL(ib_cm_listen); 1223 1224 /** 1225 * ib_cm_insert_listen - Create a new listening ib_cm_id and listen on 1226 * the given service ID. 1227 * 1228 * If there's an existing ID listening on that same device and service ID, 1229 * return it. 1230 * 1231 * @device: Device associated with the cm_id. All related communication will 1232 * be associated with the specified device. 1233 * @cm_handler: Callback invoked to notify the user of CM events. 1234 * @service_id: Service identifier matched against incoming connection 1235 * and service ID resolution requests. The service ID should be specified 1236 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1237 * assign a service ID to the caller. 1238 * 1239 * Callers should call ib_destroy_cm_id when done with the listener ID. 1240 */ 1241 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device, 1242 ib_cm_handler cm_handler, 1243 __be64 service_id) 1244 { 1245 struct cm_id_private *listen_id_priv; 1246 struct cm_id_private *cm_id_priv; 1247 int err = 0; 1248 1249 /* Create an ID in advance, since the creation may sleep */ 1250 cm_id_priv = cm_alloc_id_priv(device, cm_handler, NULL); 1251 if (IS_ERR(cm_id_priv)) 1252 return ERR_CAST(cm_id_priv); 1253 1254 err = cm_init_listen(cm_id_priv, service_id, 0); 1255 if (err) 1256 return ERR_PTR(err); 1257 1258 spin_lock_irq(&cm_id_priv->lock); 1259 listen_id_priv = cm_insert_listen(cm_id_priv, cm_handler); 1260 if (listen_id_priv != cm_id_priv) { 1261 spin_unlock_irq(&cm_id_priv->lock); 1262 ib_destroy_cm_id(&cm_id_priv->id); 1263 if (!listen_id_priv) 1264 return ERR_PTR(-EINVAL); 1265 return &listen_id_priv->id; 1266 } 1267 cm_id_priv->id.state = IB_CM_LISTEN; 1268 spin_unlock_irq(&cm_id_priv->lock); 1269 1270 /* 1271 * A listen ID does not need to be in the xarray since it does not 1272 * receive mads, is not placed in the remote_id or remote_qpn rbtree, 1273 * and does not enter timewait. 1274 */ 1275 1276 return &cm_id_priv->id; 1277 } 1278 EXPORT_SYMBOL(ib_cm_insert_listen); 1279 1280 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv) 1281 { 1282 u64 hi_tid = 0, low_tid; 1283 1284 lockdep_assert_held(&cm_id_priv->lock); 1285 1286 low_tid = (u64)cm_id_priv->id.local_id; 1287 if (!cm_id_priv->av.port) 1288 return cpu_to_be64(low_tid); 1289 1290 spin_lock(&cm_id_priv->av.port->cm_dev->mad_agent_lock); 1291 if (cm_id_priv->av.port->mad_agent) 1292 hi_tid = ((u64)cm_id_priv->av.port->mad_agent->hi_tid) << 32; 1293 spin_unlock(&cm_id_priv->av.port->cm_dev->mad_agent_lock); 1294 return cpu_to_be64(hi_tid | low_tid); 1295 } 1296 1297 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 1298 __be16 attr_id, __be64 tid) 1299 { 1300 hdr->base_version = IB_MGMT_BASE_VERSION; 1301 hdr->mgmt_class = IB_MGMT_CLASS_CM; 1302 hdr->class_version = IB_CM_CLASS_VERSION; 1303 hdr->method = IB_MGMT_METHOD_SEND; 1304 hdr->attr_id = attr_id; 1305 hdr->tid = tid; 1306 } 1307 1308 static void cm_format_mad_ece_hdr(struct ib_mad_hdr *hdr, __be16 attr_id, 1309 __be64 tid, u32 attr_mod) 1310 { 1311 cm_format_mad_hdr(hdr, attr_id, tid); 1312 hdr->attr_mod = cpu_to_be32(attr_mod); 1313 } 1314 1315 static void cm_format_req(struct cm_req_msg *req_msg, 1316 struct cm_id_private *cm_id_priv, 1317 struct ib_cm_req_param *param) 1318 { 1319 struct sa_path_rec *pri_path = param->primary_path; 1320 struct sa_path_rec *alt_path = param->alternate_path; 1321 bool pri_ext = false; 1322 1323 if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA) 1324 pri_ext = opa_is_extended_lid(pri_path->opa.dlid, 1325 pri_path->opa.slid); 1326 1327 cm_format_mad_ece_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1328 cm_form_tid(cm_id_priv), param->ece.attr_mod); 1329 1330 IBA_SET(CM_REQ_LOCAL_COMM_ID, req_msg, 1331 be32_to_cpu(cm_id_priv->id.local_id)); 1332 IBA_SET(CM_REQ_SERVICE_ID, req_msg, be64_to_cpu(param->service_id)); 1333 IBA_SET(CM_REQ_LOCAL_CA_GUID, req_msg, 1334 be64_to_cpu(cm_id_priv->id.device->node_guid)); 1335 IBA_SET(CM_REQ_LOCAL_QPN, req_msg, param->qp_num); 1336 IBA_SET(CM_REQ_INITIATOR_DEPTH, req_msg, param->initiator_depth); 1337 IBA_SET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg, 1338 param->remote_cm_response_timeout); 1339 cm_req_set_qp_type(req_msg, param->qp_type); 1340 IBA_SET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg, param->flow_control); 1341 IBA_SET(CM_REQ_STARTING_PSN, req_msg, param->starting_psn); 1342 IBA_SET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg, 1343 param->local_cm_response_timeout); 1344 IBA_SET(CM_REQ_PARTITION_KEY, req_msg, 1345 be16_to_cpu(param->primary_path->pkey)); 1346 IBA_SET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg, 1347 param->primary_path->mtu); 1348 IBA_SET(CM_REQ_MAX_CM_RETRIES, req_msg, param->max_cm_retries); 1349 1350 if (param->qp_type != IB_QPT_XRC_INI) { 1351 IBA_SET(CM_REQ_RESPONDER_RESOURCES, req_msg, 1352 param->responder_resources); 1353 IBA_SET(CM_REQ_RETRY_COUNT, req_msg, param->retry_count); 1354 IBA_SET(CM_REQ_RNR_RETRY_COUNT, req_msg, 1355 param->rnr_retry_count); 1356 IBA_SET(CM_REQ_SRQ, req_msg, param->srq); 1357 } 1358 1359 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) = 1360 pri_path->sgid; 1361 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) = 1362 pri_path->dgid; 1363 if (pri_ext) { 1364 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) 1365 ->global.interface_id = 1366 OPA_MAKE_ID(be32_to_cpu(pri_path->opa.slid)); 1367 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) 1368 ->global.interface_id = 1369 OPA_MAKE_ID(be32_to_cpu(pri_path->opa.dlid)); 1370 } 1371 if (pri_path->hop_limit <= 1) { 1372 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 1373 be16_to_cpu(pri_ext ? 0 : 1374 htons(ntohl(sa_path_get_slid( 1375 pri_path))))); 1376 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, 1377 be16_to_cpu(pri_ext ? 0 : 1378 htons(ntohl(sa_path_get_dlid( 1379 pri_path))))); 1380 } else { 1381 /* Work-around until there's a way to obtain remote LID info */ 1382 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 1383 be16_to_cpu(IB_LID_PERMISSIVE)); 1384 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, 1385 be16_to_cpu(IB_LID_PERMISSIVE)); 1386 } 1387 IBA_SET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg, 1388 be32_to_cpu(pri_path->flow_label)); 1389 IBA_SET(CM_REQ_PRIMARY_PACKET_RATE, req_msg, pri_path->rate); 1390 IBA_SET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg, pri_path->traffic_class); 1391 IBA_SET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg, pri_path->hop_limit); 1392 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, pri_path->sl); 1393 IBA_SET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg, 1394 (pri_path->hop_limit <= 1)); 1395 IBA_SET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg, 1396 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1397 pri_path->packet_life_time)); 1398 1399 if (alt_path) { 1400 bool alt_ext = false; 1401 1402 if (alt_path->rec_type == SA_PATH_REC_TYPE_OPA) 1403 alt_ext = opa_is_extended_lid(alt_path->opa.dlid, 1404 alt_path->opa.slid); 1405 1406 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg) = 1407 alt_path->sgid; 1408 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg) = 1409 alt_path->dgid; 1410 if (alt_ext) { 1411 IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, 1412 req_msg) 1413 ->global.interface_id = 1414 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.slid)); 1415 IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, 1416 req_msg) 1417 ->global.interface_id = 1418 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.dlid)); 1419 } 1420 if (alt_path->hop_limit <= 1) { 1421 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, 1422 be16_to_cpu( 1423 alt_ext ? 0 : 1424 htons(ntohl(sa_path_get_slid( 1425 alt_path))))); 1426 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, 1427 be16_to_cpu( 1428 alt_ext ? 0 : 1429 htons(ntohl(sa_path_get_dlid( 1430 alt_path))))); 1431 } else { 1432 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, 1433 be16_to_cpu(IB_LID_PERMISSIVE)); 1434 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, 1435 be16_to_cpu(IB_LID_PERMISSIVE)); 1436 } 1437 IBA_SET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg, 1438 be32_to_cpu(alt_path->flow_label)); 1439 IBA_SET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg, alt_path->rate); 1440 IBA_SET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg, 1441 alt_path->traffic_class); 1442 IBA_SET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg, 1443 alt_path->hop_limit); 1444 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, alt_path->sl); 1445 IBA_SET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg, 1446 (alt_path->hop_limit <= 1)); 1447 IBA_SET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg, 1448 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1449 alt_path->packet_life_time)); 1450 } 1451 IBA_SET(CM_REQ_VENDOR_ID, req_msg, param->ece.vendor_id); 1452 1453 if (param->private_data && param->private_data_len) 1454 IBA_SET_MEM(CM_REQ_PRIVATE_DATA, req_msg, param->private_data, 1455 param->private_data_len); 1456 } 1457 1458 static int cm_validate_req_param(struct ib_cm_req_param *param) 1459 { 1460 if (!param->primary_path) 1461 return -EINVAL; 1462 1463 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC && 1464 param->qp_type != IB_QPT_XRC_INI) 1465 return -EINVAL; 1466 1467 if (param->private_data && 1468 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1469 return -EINVAL; 1470 1471 if (param->alternate_path && 1472 (param->alternate_path->pkey != param->primary_path->pkey || 1473 param->alternate_path->mtu != param->primary_path->mtu)) 1474 return -EINVAL; 1475 1476 return 0; 1477 } 1478 1479 int ib_send_cm_req(struct ib_cm_id *cm_id, 1480 struct ib_cm_req_param *param) 1481 { 1482 struct cm_av av = {}, alt_av = {}; 1483 struct cm_id_private *cm_id_priv; 1484 struct ib_mad_send_buf *msg; 1485 struct cm_req_msg *req_msg; 1486 unsigned long flags; 1487 int ret; 1488 1489 ret = cm_validate_req_param(param); 1490 if (ret) 1491 return ret; 1492 1493 /* Verify that we're not in timewait. */ 1494 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1495 spin_lock_irqsave(&cm_id_priv->lock, flags); 1496 if (cm_id->state != IB_CM_IDLE || WARN_ON(cm_id_priv->timewait_info)) { 1497 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1498 return -EINVAL; 1499 } 1500 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1501 1502 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1503 id.local_id); 1504 if (IS_ERR(cm_id_priv->timewait_info)) { 1505 ret = PTR_ERR(cm_id_priv->timewait_info); 1506 cm_id_priv->timewait_info = NULL; 1507 return ret; 1508 } 1509 1510 ret = cm_init_av_by_path(param->primary_path, 1511 param->ppath_sgid_attr, &av); 1512 if (ret) 1513 return ret; 1514 if (param->alternate_path) { 1515 ret = cm_init_av_by_path(param->alternate_path, NULL, 1516 &alt_av); 1517 if (ret) { 1518 cm_destroy_av(&av); 1519 return ret; 1520 } 1521 } 1522 cm_id->service_id = param->service_id; 1523 cm_id->service_mask = ~cpu_to_be64(0); 1524 cm_id_priv->timeout_ms = cm_convert_to_ms( 1525 param->primary_path->packet_life_time) * 2 + 1526 cm_convert_to_ms( 1527 param->remote_cm_response_timeout); 1528 cm_id_priv->max_cm_retries = param->max_cm_retries; 1529 cm_id_priv->initiator_depth = param->initiator_depth; 1530 cm_id_priv->responder_resources = param->responder_resources; 1531 cm_id_priv->retry_count = param->retry_count; 1532 cm_id_priv->path_mtu = param->primary_path->mtu; 1533 cm_id_priv->pkey = param->primary_path->pkey; 1534 cm_id_priv->qp_type = param->qp_type; 1535 1536 spin_lock_irqsave(&cm_id_priv->lock, flags); 1537 1538 cm_move_av_from_path(&cm_id_priv->av, &av); 1539 if (param->alternate_path) 1540 cm_move_av_from_path(&cm_id_priv->alt_av, &alt_av); 1541 1542 msg = cm_alloc_priv_msg(cm_id_priv); 1543 if (IS_ERR(msg)) { 1544 ret = PTR_ERR(msg); 1545 goto out_unlock; 1546 } 1547 1548 req_msg = (struct cm_req_msg *)msg->mad; 1549 cm_format_req(req_msg, cm_id_priv, param); 1550 cm_id_priv->tid = req_msg->hdr.tid; 1551 msg->timeout_ms = cm_id_priv->timeout_ms; 1552 msg->context[1] = (void *)(unsigned long)IB_CM_REQ_SENT; 1553 1554 cm_id_priv->local_qpn = cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg)); 1555 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg)); 1556 1557 trace_icm_send_req(&cm_id_priv->id); 1558 ret = ib_post_send_mad(msg, NULL); 1559 if (ret) 1560 goto out_free; 1561 BUG_ON(cm_id->state != IB_CM_IDLE); 1562 cm_id->state = IB_CM_REQ_SENT; 1563 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1564 return 0; 1565 out_free: 1566 cm_free_priv_msg(msg); 1567 out_unlock: 1568 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1569 return ret; 1570 } 1571 EXPORT_SYMBOL(ib_send_cm_req); 1572 1573 static int cm_issue_rej(struct cm_port *port, 1574 struct ib_mad_recv_wc *mad_recv_wc, 1575 enum ib_cm_rej_reason reason, 1576 enum cm_msg_response msg_rejected, 1577 void *ari, u8 ari_length) 1578 { 1579 struct ib_mad_send_buf *msg = NULL; 1580 struct cm_rej_msg *rej_msg, *rcv_msg; 1581 int ret; 1582 1583 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1584 if (ret) 1585 return ret; 1586 1587 /* We just need common CM header information. Cast to any message. */ 1588 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1589 rej_msg = (struct cm_rej_msg *) msg->mad; 1590 1591 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1592 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg, 1593 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg)); 1594 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1595 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg)); 1596 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, msg_rejected); 1597 IBA_SET(CM_REJ_REASON, rej_msg, reason); 1598 1599 if (ari && ari_length) { 1600 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length); 1601 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length); 1602 } 1603 1604 trace_icm_issue_rej( 1605 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg), 1606 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg)); 1607 ret = ib_post_send_mad(msg, NULL); 1608 if (ret) 1609 cm_free_response_msg(msg); 1610 1611 return ret; 1612 } 1613 1614 static bool cm_req_has_alt_path(struct cm_req_msg *req_msg) 1615 { 1616 return ((cpu_to_be16( 1617 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg))) || 1618 (ib_is_opa_gid(IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, 1619 req_msg)))); 1620 } 1621 1622 static void cm_path_set_rec_type(struct ib_device *ib_device, u32 port_num, 1623 struct sa_path_rec *path, union ib_gid *gid) 1624 { 1625 if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num)) 1626 path->rec_type = SA_PATH_REC_TYPE_OPA; 1627 else 1628 path->rec_type = SA_PATH_REC_TYPE_IB; 1629 } 1630 1631 static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg, 1632 struct sa_path_rec *primary_path, 1633 struct sa_path_rec *alt_path) 1634 { 1635 u32 lid; 1636 1637 if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) { 1638 sa_path_set_dlid(primary_path, 1639 IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID, 1640 req_msg)); 1641 sa_path_set_slid(primary_path, 1642 IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID, 1643 req_msg)); 1644 } else { 1645 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1646 CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg)); 1647 sa_path_set_dlid(primary_path, lid); 1648 1649 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1650 CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg)); 1651 sa_path_set_slid(primary_path, lid); 1652 } 1653 1654 if (!cm_req_has_alt_path(req_msg)) 1655 return; 1656 1657 if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) { 1658 sa_path_set_dlid(alt_path, 1659 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, 1660 req_msg)); 1661 sa_path_set_slid(alt_path, 1662 IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, 1663 req_msg)); 1664 } else { 1665 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1666 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg)); 1667 sa_path_set_dlid(alt_path, lid); 1668 1669 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1670 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg)); 1671 sa_path_set_slid(alt_path, lid); 1672 } 1673 } 1674 1675 static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1676 struct sa_path_rec *primary_path, 1677 struct sa_path_rec *alt_path) 1678 { 1679 primary_path->dgid = 1680 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg); 1681 primary_path->sgid = 1682 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg); 1683 primary_path->flow_label = 1684 cpu_to_be32(IBA_GET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg)); 1685 primary_path->hop_limit = IBA_GET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg); 1686 primary_path->traffic_class = 1687 IBA_GET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg); 1688 primary_path->reversible = 1; 1689 primary_path->pkey = 1690 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 1691 primary_path->sl = IBA_GET(CM_REQ_PRIMARY_SL, req_msg); 1692 primary_path->mtu_selector = IB_SA_EQ; 1693 primary_path->mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 1694 primary_path->rate_selector = IB_SA_EQ; 1695 primary_path->rate = IBA_GET(CM_REQ_PRIMARY_PACKET_RATE, req_msg); 1696 primary_path->packet_life_time_selector = IB_SA_EQ; 1697 primary_path->packet_life_time = 1698 IBA_GET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg); 1699 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1700 primary_path->service_id = 1701 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 1702 if (sa_path_is_roce(primary_path)) 1703 primary_path->roce.route_resolved = false; 1704 1705 if (cm_req_has_alt_path(req_msg)) { 1706 alt_path->dgid = *IBA_GET_MEM_PTR( 1707 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg); 1708 alt_path->sgid = *IBA_GET_MEM_PTR( 1709 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg); 1710 alt_path->flow_label = cpu_to_be32( 1711 IBA_GET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg)); 1712 alt_path->hop_limit = 1713 IBA_GET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg); 1714 alt_path->traffic_class = 1715 IBA_GET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg); 1716 alt_path->reversible = 1; 1717 alt_path->pkey = 1718 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 1719 alt_path->sl = IBA_GET(CM_REQ_ALTERNATE_SL, req_msg); 1720 alt_path->mtu_selector = IB_SA_EQ; 1721 alt_path->mtu = 1722 IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 1723 alt_path->rate_selector = IB_SA_EQ; 1724 alt_path->rate = IBA_GET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg); 1725 alt_path->packet_life_time_selector = IB_SA_EQ; 1726 alt_path->packet_life_time = 1727 IBA_GET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg); 1728 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1729 alt_path->service_id = 1730 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 1731 1732 if (sa_path_is_roce(alt_path)) 1733 alt_path->roce.route_resolved = false; 1734 } 1735 cm_format_path_lid_from_req(req_msg, primary_path, alt_path); 1736 } 1737 1738 static u16 cm_get_bth_pkey(struct cm_work *work) 1739 { 1740 struct ib_device *ib_dev = work->port->cm_dev->ib_device; 1741 u32 port_num = work->port->port_num; 1742 u16 pkey_index = work->mad_recv_wc->wc->pkey_index; 1743 u16 pkey; 1744 int ret; 1745 1746 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey); 1747 if (ret) { 1748 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %u, pkey index %u). %d\n", 1749 port_num, pkey_index, ret); 1750 return 0; 1751 } 1752 1753 return pkey; 1754 } 1755 1756 /** 1757 * cm_opa_to_ib_sgid - Convert OPA SGID to IB SGID 1758 * ULPs (such as IPoIB) do not understand OPA GIDs and will 1759 * reject them as the local_gid will not match the sgid. Therefore, 1760 * change the pathrec's SGID to an IB SGID. 1761 * 1762 * @work: Work completion 1763 * @path: Path record 1764 */ 1765 static void cm_opa_to_ib_sgid(struct cm_work *work, 1766 struct sa_path_rec *path) 1767 { 1768 struct ib_device *dev = work->port->cm_dev->ib_device; 1769 u32 port_num = work->port->port_num; 1770 1771 if (rdma_cap_opa_ah(dev, port_num) && 1772 (ib_is_opa_gid(&path->sgid))) { 1773 union ib_gid sgid; 1774 1775 if (rdma_query_gid(dev, port_num, 0, &sgid)) { 1776 dev_warn(&dev->dev, 1777 "Error updating sgid in CM request\n"); 1778 return; 1779 } 1780 1781 path->sgid = sgid; 1782 } 1783 } 1784 1785 static void cm_format_req_event(struct cm_work *work, 1786 struct cm_id_private *cm_id_priv, 1787 struct ib_cm_id *listen_id) 1788 { 1789 struct cm_req_msg *req_msg; 1790 struct ib_cm_req_event_param *param; 1791 1792 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1793 param = &work->cm_event.param.req_rcvd; 1794 param->listen_id = listen_id; 1795 param->bth_pkey = cm_get_bth_pkey(work); 1796 param->port = cm_id_priv->av.port->port_num; 1797 param->primary_path = &work->path[0]; 1798 cm_opa_to_ib_sgid(work, param->primary_path); 1799 if (cm_req_has_alt_path(req_msg)) { 1800 param->alternate_path = &work->path[1]; 1801 cm_opa_to_ib_sgid(work, param->alternate_path); 1802 } else { 1803 param->alternate_path = NULL; 1804 } 1805 param->remote_ca_guid = 1806 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg)); 1807 param->remote_qkey = IBA_GET(CM_REQ_LOCAL_Q_KEY, req_msg); 1808 param->remote_qpn = IBA_GET(CM_REQ_LOCAL_QPN, req_msg); 1809 param->qp_type = cm_req_get_qp_type(req_msg); 1810 param->starting_psn = IBA_GET(CM_REQ_STARTING_PSN, req_msg); 1811 param->responder_resources = IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg); 1812 param->initiator_depth = IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg); 1813 param->local_cm_response_timeout = 1814 IBA_GET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg); 1815 param->flow_control = IBA_GET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg); 1816 param->remote_cm_response_timeout = 1817 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg); 1818 param->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg); 1819 param->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg); 1820 param->srq = IBA_GET(CM_REQ_SRQ, req_msg); 1821 param->ppath_sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr; 1822 param->ece.vendor_id = IBA_GET(CM_REQ_VENDOR_ID, req_msg); 1823 param->ece.attr_mod = be32_to_cpu(req_msg->hdr.attr_mod); 1824 1825 work->cm_event.private_data = 1826 IBA_GET_MEM_PTR(CM_REQ_PRIVATE_DATA, req_msg); 1827 } 1828 1829 static void cm_process_work(struct cm_id_private *cm_id_priv, 1830 struct cm_work *work) 1831 { 1832 int ret; 1833 1834 /* We will typically only have the current event to report. */ 1835 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1836 cm_free_work(work); 1837 1838 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1839 spin_lock_irq(&cm_id_priv->lock); 1840 work = cm_dequeue_work(cm_id_priv); 1841 spin_unlock_irq(&cm_id_priv->lock); 1842 if (!work) 1843 return; 1844 1845 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1846 &work->cm_event); 1847 cm_free_work(work); 1848 } 1849 cm_deref_id(cm_id_priv); 1850 if (ret) 1851 cm_destroy_id(&cm_id_priv->id, ret); 1852 } 1853 1854 static void cm_format_mra(struct cm_mra_msg *mra_msg, 1855 struct cm_id_private *cm_id_priv, 1856 enum cm_msg_response msg_mraed, u8 service_timeout, 1857 const void *private_data, u8 private_data_len) 1858 { 1859 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1860 IBA_SET(CM_MRA_MESSAGE_MRAED, mra_msg, msg_mraed); 1861 IBA_SET(CM_MRA_LOCAL_COMM_ID, mra_msg, 1862 be32_to_cpu(cm_id_priv->id.local_id)); 1863 IBA_SET(CM_MRA_REMOTE_COMM_ID, mra_msg, 1864 be32_to_cpu(cm_id_priv->id.remote_id)); 1865 IBA_SET(CM_MRA_SERVICE_TIMEOUT, mra_msg, service_timeout); 1866 1867 if (private_data && private_data_len) 1868 IBA_SET_MEM(CM_MRA_PRIVATE_DATA, mra_msg, private_data, 1869 private_data_len); 1870 } 1871 1872 static void cm_format_rej(struct cm_rej_msg *rej_msg, 1873 struct cm_id_private *cm_id_priv, 1874 enum ib_cm_rej_reason reason, void *ari, 1875 u8 ari_length, const void *private_data, 1876 u8 private_data_len, enum ib_cm_state state) 1877 { 1878 lockdep_assert_held(&cm_id_priv->lock); 1879 1880 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1881 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg, 1882 be32_to_cpu(cm_id_priv->id.remote_id)); 1883 1884 switch (state) { 1885 case IB_CM_REQ_RCVD: 1886 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, be32_to_cpu(0)); 1887 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ); 1888 break; 1889 case IB_CM_MRA_REQ_SENT: 1890 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1891 be32_to_cpu(cm_id_priv->id.local_id)); 1892 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ); 1893 break; 1894 case IB_CM_REP_RCVD: 1895 case IB_CM_MRA_REP_SENT: 1896 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1897 be32_to_cpu(cm_id_priv->id.local_id)); 1898 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REP); 1899 break; 1900 default: 1901 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1902 be32_to_cpu(cm_id_priv->id.local_id)); 1903 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, 1904 CM_MSG_RESPONSE_OTHER); 1905 break; 1906 } 1907 1908 IBA_SET(CM_REJ_REASON, rej_msg, reason); 1909 if (ari && ari_length) { 1910 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length); 1911 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length); 1912 } 1913 1914 if (private_data && private_data_len) 1915 IBA_SET_MEM(CM_REJ_PRIVATE_DATA, rej_msg, private_data, 1916 private_data_len); 1917 } 1918 1919 static void cm_dup_req_handler(struct cm_work *work, 1920 struct cm_id_private *cm_id_priv) 1921 { 1922 struct ib_mad_send_buf *msg = NULL; 1923 int ret; 1924 1925 atomic_long_inc( 1926 &work->port->counters[CM_RECV_DUPLICATES][CM_REQ_COUNTER]); 1927 1928 /* Quick state check to discard duplicate REQs. */ 1929 spin_lock_irq(&cm_id_priv->lock); 1930 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) { 1931 spin_unlock_irq(&cm_id_priv->lock); 1932 return; 1933 } 1934 spin_unlock_irq(&cm_id_priv->lock); 1935 1936 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1937 if (ret) 1938 return; 1939 1940 spin_lock_irq(&cm_id_priv->lock); 1941 switch (cm_id_priv->id.state) { 1942 case IB_CM_MRA_REQ_SENT: 1943 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1944 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1945 cm_id_priv->private_data, 1946 cm_id_priv->private_data_len); 1947 break; 1948 case IB_CM_TIMEWAIT: 1949 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, 1950 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0, 1951 IB_CM_TIMEWAIT); 1952 break; 1953 default: 1954 goto unlock; 1955 } 1956 spin_unlock_irq(&cm_id_priv->lock); 1957 1958 trace_icm_send_dup_req(&cm_id_priv->id); 1959 ret = ib_post_send_mad(msg, NULL); 1960 if (ret) 1961 goto free; 1962 return; 1963 1964 unlock: spin_unlock_irq(&cm_id_priv->lock); 1965 free: cm_free_response_msg(msg); 1966 } 1967 1968 static struct cm_id_private *cm_match_req(struct cm_work *work, 1969 struct cm_id_private *cm_id_priv) 1970 { 1971 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1972 struct cm_timewait_info *timewait_info; 1973 struct cm_req_msg *req_msg; 1974 1975 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1976 1977 /* Check for possible duplicate REQ. */ 1978 spin_lock_irq(&cm.lock); 1979 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1980 if (timewait_info) { 1981 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 1982 timewait_info->work.remote_id); 1983 spin_unlock_irq(&cm.lock); 1984 if (cur_cm_id_priv) { 1985 cm_dup_req_handler(work, cur_cm_id_priv); 1986 cm_deref_id(cur_cm_id_priv); 1987 } 1988 return NULL; 1989 } 1990 1991 /* Check for stale connections. */ 1992 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1993 if (timewait_info) { 1994 cm_remove_remote(cm_id_priv); 1995 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 1996 timewait_info->work.remote_id); 1997 1998 spin_unlock_irq(&cm.lock); 1999 cm_issue_rej(work->port, work->mad_recv_wc, 2000 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 2001 NULL, 0); 2002 if (cur_cm_id_priv) { 2003 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0); 2004 cm_deref_id(cur_cm_id_priv); 2005 } 2006 return NULL; 2007 } 2008 2009 /* Find matching listen request. */ 2010 listen_cm_id_priv = cm_find_listen( 2011 cm_id_priv->id.device, 2012 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg))); 2013 if (!listen_cm_id_priv) { 2014 cm_remove_remote(cm_id_priv); 2015 spin_unlock_irq(&cm.lock); 2016 cm_issue_rej(work->port, work->mad_recv_wc, 2017 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 2018 NULL, 0); 2019 return NULL; 2020 } 2021 spin_unlock_irq(&cm.lock); 2022 return listen_cm_id_priv; 2023 } 2024 2025 /* 2026 * Work-around for inter-subnet connections. If the LIDs are permissive, 2027 * we need to override the LID/SL data in the REQ with the LID information 2028 * in the work completion. 2029 */ 2030 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 2031 { 2032 if (!IBA_GET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg)) { 2033 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID, 2034 req_msg)) == IB_LID_PERMISSIVE) { 2035 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 2036 be16_to_cpu(ib_lid_be16(wc->slid))); 2037 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, wc->sl); 2038 } 2039 2040 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID, 2041 req_msg)) == IB_LID_PERMISSIVE) 2042 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, 2043 wc->dlid_path_bits); 2044 } 2045 2046 if (!IBA_GET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg)) { 2047 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, 2048 req_msg)) == IB_LID_PERMISSIVE) { 2049 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, 2050 be16_to_cpu(ib_lid_be16(wc->slid))); 2051 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, wc->sl); 2052 } 2053 2054 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, 2055 req_msg)) == IB_LID_PERMISSIVE) 2056 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, 2057 wc->dlid_path_bits); 2058 } 2059 } 2060 2061 static int cm_req_handler(struct cm_work *work) 2062 { 2063 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 2064 struct cm_req_msg *req_msg; 2065 const struct ib_global_route *grh; 2066 const struct ib_gid_attr *gid_attr; 2067 int ret; 2068 2069 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 2070 2071 cm_id_priv = 2072 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL); 2073 if (IS_ERR(cm_id_priv)) 2074 return PTR_ERR(cm_id_priv); 2075 2076 cm_id_priv->id.remote_id = 2077 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_COMM_ID, req_msg)); 2078 cm_id_priv->id.service_id = 2079 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 2080 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 2081 cm_id_priv->tid = req_msg->hdr.tid; 2082 cm_id_priv->timeout_ms = cm_convert_to_ms( 2083 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg)); 2084 cm_id_priv->max_cm_retries = IBA_GET(CM_REQ_MAX_CM_RETRIES, req_msg); 2085 cm_id_priv->remote_qpn = 2086 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg)); 2087 cm_id_priv->initiator_depth = 2088 IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg); 2089 cm_id_priv->responder_resources = 2090 IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg); 2091 cm_id_priv->path_mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 2092 cm_id_priv->pkey = cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 2093 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg)); 2094 cm_id_priv->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg); 2095 cm_id_priv->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg); 2096 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 2097 2098 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2099 work->mad_recv_wc->recv_buf.grh, 2100 &cm_id_priv->av); 2101 if (ret) 2102 goto destroy; 2103 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 2104 id.local_id); 2105 if (IS_ERR(cm_id_priv->timewait_info)) { 2106 ret = PTR_ERR(cm_id_priv->timewait_info); 2107 cm_id_priv->timewait_info = NULL; 2108 goto destroy; 2109 } 2110 cm_id_priv->timewait_info->work.remote_id = cm_id_priv->id.remote_id; 2111 cm_id_priv->timewait_info->remote_ca_guid = 2112 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg)); 2113 cm_id_priv->timewait_info->remote_qpn = cm_id_priv->remote_qpn; 2114 2115 /* 2116 * Note that the ID pointer is not in the xarray at this point, 2117 * so this set is only visible to the local thread. 2118 */ 2119 cm_id_priv->id.state = IB_CM_REQ_RCVD; 2120 2121 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 2122 if (!listen_cm_id_priv) { 2123 trace_icm_no_listener_err(&cm_id_priv->id); 2124 cm_id_priv->id.state = IB_CM_IDLE; 2125 ret = -EINVAL; 2126 goto destroy; 2127 } 2128 2129 memset(&work->path[0], 0, sizeof(work->path[0])); 2130 if (cm_req_has_alt_path(req_msg)) 2131 memset(&work->path[1], 0, sizeof(work->path[1])); 2132 grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr); 2133 gid_attr = grh->sgid_attr; 2134 2135 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE) { 2136 work->path[0].rec_type = 2137 sa_conv_gid_to_pathrec_type(gid_attr->gid_type); 2138 } else { 2139 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 2140 cm_path_set_rec_type( 2141 work->port->cm_dev->ib_device, work->port->port_num, 2142 &work->path[0], 2143 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, 2144 req_msg)); 2145 } 2146 if (cm_req_has_alt_path(req_msg)) 2147 work->path[1].rec_type = work->path[0].rec_type; 2148 cm_format_paths_from_req(req_msg, &work->path[0], 2149 &work->path[1]); 2150 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE) 2151 sa_path_set_dmac(&work->path[0], 2152 cm_id_priv->av.ah_attr.roce.dmac); 2153 work->path[0].hop_limit = grh->hop_limit; 2154 2155 /* This destroy call is needed to pair with cm_init_av_for_response */ 2156 cm_destroy_av(&cm_id_priv->av); 2157 ret = cm_init_av_by_path(&work->path[0], gid_attr, &cm_id_priv->av); 2158 if (ret) { 2159 int err; 2160 2161 err = rdma_query_gid(work->port->cm_dev->ib_device, 2162 work->port->port_num, 0, 2163 &work->path[0].sgid); 2164 if (err) 2165 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID, 2166 NULL, 0, NULL, 0); 2167 else 2168 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID, 2169 &work->path[0].sgid, 2170 sizeof(work->path[0].sgid), 2171 NULL, 0); 2172 goto rejected; 2173 } 2174 if (cm_req_has_alt_path(req_msg)) { 2175 ret = cm_init_av_by_path(&work->path[1], NULL, 2176 &cm_id_priv->alt_av); 2177 if (ret) { 2178 ib_send_cm_rej(&cm_id_priv->id, 2179 IB_CM_REJ_INVALID_ALT_GID, 2180 &work->path[0].sgid, 2181 sizeof(work->path[0].sgid), NULL, 0); 2182 goto rejected; 2183 } 2184 } 2185 2186 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 2187 cm_id_priv->id.context = listen_cm_id_priv->id.context; 2188 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 2189 2190 /* Now MAD handlers can see the new ID */ 2191 spin_lock_irq(&cm_id_priv->lock); 2192 cm_finalize_id(cm_id_priv); 2193 2194 /* Refcount belongs to the event, pairs with cm_process_work() */ 2195 refcount_inc(&cm_id_priv->refcount); 2196 cm_queue_work_unlock(cm_id_priv, work); 2197 /* 2198 * Since this ID was just created and was not made visible to other MAD 2199 * handlers until the cm_finalize_id() above we know that the 2200 * cm_process_work() will deliver the event and the listen_cm_id 2201 * embedded in the event can be derefed here. 2202 */ 2203 cm_deref_id(listen_cm_id_priv); 2204 return 0; 2205 2206 rejected: 2207 cm_deref_id(listen_cm_id_priv); 2208 destroy: 2209 ib_destroy_cm_id(&cm_id_priv->id); 2210 return ret; 2211 } 2212 2213 static void cm_format_rep(struct cm_rep_msg *rep_msg, 2214 struct cm_id_private *cm_id_priv, 2215 struct ib_cm_rep_param *param) 2216 { 2217 cm_format_mad_ece_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid, 2218 param->ece.attr_mod); 2219 IBA_SET(CM_REP_LOCAL_COMM_ID, rep_msg, 2220 be32_to_cpu(cm_id_priv->id.local_id)); 2221 IBA_SET(CM_REP_REMOTE_COMM_ID, rep_msg, 2222 be32_to_cpu(cm_id_priv->id.remote_id)); 2223 IBA_SET(CM_REP_STARTING_PSN, rep_msg, param->starting_psn); 2224 IBA_SET(CM_REP_RESPONDER_RESOURCES, rep_msg, 2225 param->responder_resources); 2226 IBA_SET(CM_REP_TARGET_ACK_DELAY, rep_msg, 2227 cm_id_priv->av.port->cm_dev->ack_delay); 2228 IBA_SET(CM_REP_FAILOVER_ACCEPTED, rep_msg, param->failover_accepted); 2229 IBA_SET(CM_REP_RNR_RETRY_COUNT, rep_msg, param->rnr_retry_count); 2230 IBA_SET(CM_REP_LOCAL_CA_GUID, rep_msg, 2231 be64_to_cpu(cm_id_priv->id.device->node_guid)); 2232 2233 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) { 2234 IBA_SET(CM_REP_INITIATOR_DEPTH, rep_msg, 2235 param->initiator_depth); 2236 IBA_SET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg, 2237 param->flow_control); 2238 IBA_SET(CM_REP_SRQ, rep_msg, param->srq); 2239 IBA_SET(CM_REP_LOCAL_QPN, rep_msg, param->qp_num); 2240 } else { 2241 IBA_SET(CM_REP_SRQ, rep_msg, 1); 2242 IBA_SET(CM_REP_LOCAL_EE_CONTEXT_NUMBER, rep_msg, param->qp_num); 2243 } 2244 2245 IBA_SET(CM_REP_VENDOR_ID_L, rep_msg, param->ece.vendor_id); 2246 IBA_SET(CM_REP_VENDOR_ID_M, rep_msg, param->ece.vendor_id >> 8); 2247 IBA_SET(CM_REP_VENDOR_ID_H, rep_msg, param->ece.vendor_id >> 16); 2248 2249 if (param->private_data && param->private_data_len) 2250 IBA_SET_MEM(CM_REP_PRIVATE_DATA, rep_msg, param->private_data, 2251 param->private_data_len); 2252 } 2253 2254 int ib_send_cm_rep(struct ib_cm_id *cm_id, 2255 struct ib_cm_rep_param *param) 2256 { 2257 struct cm_id_private *cm_id_priv; 2258 struct ib_mad_send_buf *msg; 2259 struct cm_rep_msg *rep_msg; 2260 unsigned long flags; 2261 int ret; 2262 2263 if (param->private_data && 2264 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 2265 return -EINVAL; 2266 2267 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2268 spin_lock_irqsave(&cm_id_priv->lock, flags); 2269 if (cm_id->state != IB_CM_REQ_RCVD && 2270 cm_id->state != IB_CM_MRA_REQ_SENT) { 2271 trace_icm_send_rep_err(cm_id_priv->id.local_id, cm_id->state); 2272 ret = -EINVAL; 2273 goto out; 2274 } 2275 2276 msg = cm_alloc_priv_msg(cm_id_priv); 2277 if (IS_ERR(msg)) { 2278 ret = PTR_ERR(msg); 2279 goto out; 2280 } 2281 2282 rep_msg = (struct cm_rep_msg *) msg->mad; 2283 cm_format_rep(rep_msg, cm_id_priv, param); 2284 msg->timeout_ms = cm_id_priv->timeout_ms; 2285 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 2286 2287 trace_icm_send_rep(cm_id); 2288 ret = ib_post_send_mad(msg, NULL); 2289 if (ret) 2290 goto out_free; 2291 2292 cm_id->state = IB_CM_REP_SENT; 2293 cm_id_priv->initiator_depth = param->initiator_depth; 2294 cm_id_priv->responder_resources = param->responder_resources; 2295 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg)); 2296 WARN_ONCE(param->qp_num & 0xFF000000, 2297 "IBTA declares QPN to be 24 bits, but it is 0x%X\n", 2298 param->qp_num); 2299 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF); 2300 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2301 return 0; 2302 2303 out_free: 2304 cm_free_priv_msg(msg); 2305 out: 2306 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2307 return ret; 2308 } 2309 EXPORT_SYMBOL(ib_send_cm_rep); 2310 2311 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 2312 struct cm_id_private *cm_id_priv, 2313 const void *private_data, 2314 u8 private_data_len) 2315 { 2316 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 2317 IBA_SET(CM_RTU_LOCAL_COMM_ID, rtu_msg, 2318 be32_to_cpu(cm_id_priv->id.local_id)); 2319 IBA_SET(CM_RTU_REMOTE_COMM_ID, rtu_msg, 2320 be32_to_cpu(cm_id_priv->id.remote_id)); 2321 2322 if (private_data && private_data_len) 2323 IBA_SET_MEM(CM_RTU_PRIVATE_DATA, rtu_msg, private_data, 2324 private_data_len); 2325 } 2326 2327 int ib_send_cm_rtu(struct ib_cm_id *cm_id, 2328 const void *private_data, 2329 u8 private_data_len) 2330 { 2331 struct cm_id_private *cm_id_priv; 2332 struct ib_mad_send_buf *msg; 2333 unsigned long flags; 2334 void *data; 2335 int ret; 2336 2337 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 2338 return -EINVAL; 2339 2340 data = cm_copy_private_data(private_data, private_data_len); 2341 if (IS_ERR(data)) 2342 return PTR_ERR(data); 2343 2344 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2345 spin_lock_irqsave(&cm_id_priv->lock, flags); 2346 if (cm_id->state != IB_CM_REP_RCVD && 2347 cm_id->state != IB_CM_MRA_REP_SENT) { 2348 trace_icm_send_cm_rtu_err(cm_id); 2349 ret = -EINVAL; 2350 goto error; 2351 } 2352 2353 msg = cm_alloc_msg(cm_id_priv); 2354 if (IS_ERR(msg)) { 2355 ret = PTR_ERR(msg); 2356 goto error; 2357 } 2358 2359 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 2360 private_data, private_data_len); 2361 2362 trace_icm_send_rtu(cm_id); 2363 ret = ib_post_send_mad(msg, NULL); 2364 if (ret) { 2365 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2366 cm_free_msg(msg); 2367 kfree(data); 2368 return ret; 2369 } 2370 2371 cm_id->state = IB_CM_ESTABLISHED; 2372 cm_set_private_data(cm_id_priv, data, private_data_len); 2373 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2374 return 0; 2375 2376 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2377 kfree(data); 2378 return ret; 2379 } 2380 EXPORT_SYMBOL(ib_send_cm_rtu); 2381 2382 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type) 2383 { 2384 struct cm_rep_msg *rep_msg; 2385 struct ib_cm_rep_event_param *param; 2386 2387 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 2388 param = &work->cm_event.param.rep_rcvd; 2389 param->remote_ca_guid = 2390 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg)); 2391 param->remote_qkey = IBA_GET(CM_REP_LOCAL_Q_KEY, rep_msg); 2392 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type)); 2393 param->starting_psn = IBA_GET(CM_REP_STARTING_PSN, rep_msg); 2394 param->responder_resources = IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg); 2395 param->initiator_depth = IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg); 2396 param->target_ack_delay = IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg); 2397 param->failover_accepted = IBA_GET(CM_REP_FAILOVER_ACCEPTED, rep_msg); 2398 param->flow_control = IBA_GET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg); 2399 param->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg); 2400 param->srq = IBA_GET(CM_REP_SRQ, rep_msg); 2401 param->ece.vendor_id = IBA_GET(CM_REP_VENDOR_ID_H, rep_msg) << 16; 2402 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_M, rep_msg) << 8; 2403 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_L, rep_msg); 2404 param->ece.attr_mod = be32_to_cpu(rep_msg->hdr.attr_mod); 2405 2406 work->cm_event.private_data = 2407 IBA_GET_MEM_PTR(CM_REP_PRIVATE_DATA, rep_msg); 2408 } 2409 2410 static void cm_dup_rep_handler(struct cm_work *work) 2411 { 2412 struct cm_id_private *cm_id_priv; 2413 struct cm_rep_msg *rep_msg; 2414 struct ib_mad_send_buf *msg = NULL; 2415 int ret; 2416 2417 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 2418 cm_id_priv = cm_acquire_id( 2419 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 2420 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg))); 2421 if (!cm_id_priv) 2422 return; 2423 2424 atomic_long_inc( 2425 &work->port->counters[CM_RECV_DUPLICATES][CM_REP_COUNTER]); 2426 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 2427 if (ret) 2428 goto deref; 2429 2430 spin_lock_irq(&cm_id_priv->lock); 2431 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 2432 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 2433 cm_id_priv->private_data, 2434 cm_id_priv->private_data_len); 2435 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 2436 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2437 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 2438 cm_id_priv->private_data, 2439 cm_id_priv->private_data_len); 2440 else 2441 goto unlock; 2442 spin_unlock_irq(&cm_id_priv->lock); 2443 2444 trace_icm_send_dup_rep(&cm_id_priv->id); 2445 ret = ib_post_send_mad(msg, NULL); 2446 if (ret) 2447 goto free; 2448 goto deref; 2449 2450 unlock: spin_unlock_irq(&cm_id_priv->lock); 2451 free: cm_free_response_msg(msg); 2452 deref: cm_deref_id(cm_id_priv); 2453 } 2454 2455 static int cm_rep_handler(struct cm_work *work) 2456 { 2457 struct cm_id_private *cm_id_priv; 2458 struct cm_rep_msg *rep_msg; 2459 int ret; 2460 struct cm_id_private *cur_cm_id_priv; 2461 struct cm_timewait_info *timewait_info; 2462 2463 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 2464 cm_id_priv = cm_acquire_id( 2465 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 0); 2466 if (!cm_id_priv) { 2467 cm_dup_rep_handler(work); 2468 trace_icm_remote_no_priv_err( 2469 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2470 return -EINVAL; 2471 } 2472 2473 cm_format_rep_event(work, cm_id_priv->qp_type); 2474 2475 spin_lock_irq(&cm_id_priv->lock); 2476 switch (cm_id_priv->id.state) { 2477 case IB_CM_REQ_SENT: 2478 case IB_CM_MRA_REQ_RCVD: 2479 break; 2480 default: 2481 ret = -EINVAL; 2482 trace_icm_rep_unknown_err( 2483 IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg), 2484 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg), 2485 cm_id_priv->id.state); 2486 spin_unlock_irq(&cm_id_priv->lock); 2487 goto error; 2488 } 2489 2490 cm_id_priv->timewait_info->work.remote_id = 2491 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)); 2492 cm_id_priv->timewait_info->remote_ca_guid = 2493 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg)); 2494 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2495 2496 spin_lock(&cm.lock); 2497 /* Check for duplicate REP. */ 2498 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 2499 spin_unlock(&cm.lock); 2500 spin_unlock_irq(&cm_id_priv->lock); 2501 ret = -EINVAL; 2502 trace_icm_insert_failed_err( 2503 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2504 goto error; 2505 } 2506 /* Check for a stale connection. */ 2507 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 2508 if (timewait_info) { 2509 cm_remove_remote(cm_id_priv); 2510 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2511 timewait_info->work.remote_id); 2512 2513 spin_unlock(&cm.lock); 2514 spin_unlock_irq(&cm_id_priv->lock); 2515 cm_issue_rej(work->port, work->mad_recv_wc, 2516 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 2517 NULL, 0); 2518 ret = -EINVAL; 2519 trace_icm_staleconn_err( 2520 IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg), 2521 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2522 2523 if (cur_cm_id_priv) { 2524 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0); 2525 cm_deref_id(cur_cm_id_priv); 2526 } 2527 2528 goto error; 2529 } 2530 spin_unlock(&cm.lock); 2531 2532 cm_id_priv->id.state = IB_CM_REP_RCVD; 2533 cm_id_priv->id.remote_id = 2534 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)); 2535 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2536 cm_id_priv->initiator_depth = 2537 IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg); 2538 cm_id_priv->responder_resources = 2539 IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg); 2540 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg)); 2541 cm_id_priv->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg); 2542 cm_id_priv->target_ack_delay = 2543 IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg); 2544 cm_id_priv->av.timeout = 2545 cm_ack_timeout(cm_id_priv->target_ack_delay, 2546 cm_id_priv->av.timeout - 1); 2547 cm_id_priv->alt_av.timeout = 2548 cm_ack_timeout(cm_id_priv->target_ack_delay, 2549 cm_id_priv->alt_av.timeout - 1); 2550 2551 ib_cancel_mad(cm_id_priv->msg); 2552 cm_queue_work_unlock(cm_id_priv, work); 2553 return 0; 2554 2555 error: 2556 cm_deref_id(cm_id_priv); 2557 return ret; 2558 } 2559 2560 static int cm_establish_handler(struct cm_work *work) 2561 { 2562 struct cm_id_private *cm_id_priv; 2563 2564 /* See comment in cm_establish about lookup. */ 2565 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 2566 if (!cm_id_priv) 2567 return -EINVAL; 2568 2569 spin_lock_irq(&cm_id_priv->lock); 2570 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 2571 spin_unlock_irq(&cm_id_priv->lock); 2572 goto out; 2573 } 2574 2575 ib_cancel_mad(cm_id_priv->msg); 2576 cm_queue_work_unlock(cm_id_priv, work); 2577 return 0; 2578 out: 2579 cm_deref_id(cm_id_priv); 2580 return -EINVAL; 2581 } 2582 2583 static int cm_rtu_handler(struct cm_work *work) 2584 { 2585 struct cm_id_private *cm_id_priv; 2586 struct cm_rtu_msg *rtu_msg; 2587 2588 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 2589 cm_id_priv = cm_acquire_id( 2590 cpu_to_be32(IBA_GET(CM_RTU_REMOTE_COMM_ID, rtu_msg)), 2591 cpu_to_be32(IBA_GET(CM_RTU_LOCAL_COMM_ID, rtu_msg))); 2592 if (!cm_id_priv) 2593 return -EINVAL; 2594 2595 work->cm_event.private_data = 2596 IBA_GET_MEM_PTR(CM_RTU_PRIVATE_DATA, rtu_msg); 2597 2598 spin_lock_irq(&cm_id_priv->lock); 2599 if (cm_id_priv->id.state != IB_CM_REP_SENT && 2600 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 2601 spin_unlock_irq(&cm_id_priv->lock); 2602 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 2603 [CM_RTU_COUNTER]); 2604 goto out; 2605 } 2606 cm_id_priv->id.state = IB_CM_ESTABLISHED; 2607 2608 ib_cancel_mad(cm_id_priv->msg); 2609 cm_queue_work_unlock(cm_id_priv, work); 2610 return 0; 2611 out: 2612 cm_deref_id(cm_id_priv); 2613 return -EINVAL; 2614 } 2615 2616 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 2617 struct cm_id_private *cm_id_priv, 2618 const void *private_data, 2619 u8 private_data_len) 2620 { 2621 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 2622 cm_form_tid(cm_id_priv)); 2623 IBA_SET(CM_DREQ_LOCAL_COMM_ID, dreq_msg, 2624 be32_to_cpu(cm_id_priv->id.local_id)); 2625 IBA_SET(CM_DREQ_REMOTE_COMM_ID, dreq_msg, 2626 be32_to_cpu(cm_id_priv->id.remote_id)); 2627 IBA_SET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg, 2628 be32_to_cpu(cm_id_priv->remote_qpn)); 2629 2630 if (private_data && private_data_len) 2631 IBA_SET_MEM(CM_DREQ_PRIVATE_DATA, dreq_msg, private_data, 2632 private_data_len); 2633 } 2634 2635 static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv, 2636 const void *private_data, u8 private_data_len) 2637 { 2638 struct ib_mad_send_buf *msg; 2639 int ret; 2640 2641 lockdep_assert_held(&cm_id_priv->lock); 2642 2643 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 2644 return -EINVAL; 2645 2646 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 2647 trace_icm_dreq_skipped(&cm_id_priv->id); 2648 return -EINVAL; 2649 } 2650 2651 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2652 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2653 ib_cancel_mad(cm_id_priv->msg); 2654 2655 msg = cm_alloc_priv_msg(cm_id_priv); 2656 if (IS_ERR(msg)) { 2657 cm_enter_timewait(cm_id_priv); 2658 return PTR_ERR(msg); 2659 } 2660 2661 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 2662 private_data, private_data_len); 2663 msg->timeout_ms = cm_id_priv->timeout_ms; 2664 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2665 2666 trace_icm_send_dreq(&cm_id_priv->id); 2667 ret = ib_post_send_mad(msg, NULL); 2668 if (ret) { 2669 cm_enter_timewait(cm_id_priv); 2670 cm_free_priv_msg(msg); 2671 return ret; 2672 } 2673 2674 cm_id_priv->id.state = IB_CM_DREQ_SENT; 2675 return 0; 2676 } 2677 2678 int ib_send_cm_dreq(struct ib_cm_id *cm_id, const void *private_data, 2679 u8 private_data_len) 2680 { 2681 struct cm_id_private *cm_id_priv = 2682 container_of(cm_id, struct cm_id_private, id); 2683 unsigned long flags; 2684 int ret; 2685 2686 spin_lock_irqsave(&cm_id_priv->lock, flags); 2687 ret = cm_send_dreq_locked(cm_id_priv, private_data, private_data_len); 2688 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2689 return ret; 2690 } 2691 EXPORT_SYMBOL(ib_send_cm_dreq); 2692 2693 static void cm_format_drep(struct cm_drep_msg *drep_msg, 2694 struct cm_id_private *cm_id_priv, 2695 const void *private_data, 2696 u8 private_data_len) 2697 { 2698 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2699 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg, 2700 be32_to_cpu(cm_id_priv->id.local_id)); 2701 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg, 2702 be32_to_cpu(cm_id_priv->id.remote_id)); 2703 2704 if (private_data && private_data_len) 2705 IBA_SET_MEM(CM_DREP_PRIVATE_DATA, drep_msg, private_data, 2706 private_data_len); 2707 } 2708 2709 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv, 2710 void *private_data, u8 private_data_len) 2711 { 2712 struct ib_mad_send_buf *msg; 2713 int ret; 2714 2715 lockdep_assert_held(&cm_id_priv->lock); 2716 2717 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2718 return -EINVAL; 2719 2720 if (cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2721 trace_icm_send_drep_err(&cm_id_priv->id); 2722 kfree(private_data); 2723 return -EINVAL; 2724 } 2725 2726 cm_set_private_data(cm_id_priv, private_data, private_data_len); 2727 cm_enter_timewait(cm_id_priv); 2728 2729 msg = cm_alloc_msg(cm_id_priv); 2730 if (IS_ERR(msg)) 2731 return PTR_ERR(msg); 2732 2733 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2734 private_data, private_data_len); 2735 2736 trace_icm_send_drep(&cm_id_priv->id); 2737 ret = ib_post_send_mad(msg, NULL); 2738 if (ret) { 2739 cm_free_msg(msg); 2740 return ret; 2741 } 2742 return 0; 2743 } 2744 2745 int ib_send_cm_drep(struct ib_cm_id *cm_id, const void *private_data, 2746 u8 private_data_len) 2747 { 2748 struct cm_id_private *cm_id_priv = 2749 container_of(cm_id, struct cm_id_private, id); 2750 unsigned long flags; 2751 void *data; 2752 int ret; 2753 2754 data = cm_copy_private_data(private_data, private_data_len); 2755 if (IS_ERR(data)) 2756 return PTR_ERR(data); 2757 2758 spin_lock_irqsave(&cm_id_priv->lock, flags); 2759 ret = cm_send_drep_locked(cm_id_priv, data, private_data_len); 2760 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2761 return ret; 2762 } 2763 EXPORT_SYMBOL(ib_send_cm_drep); 2764 2765 static int cm_issue_drep(struct cm_port *port, 2766 struct ib_mad_recv_wc *mad_recv_wc) 2767 { 2768 struct ib_mad_send_buf *msg = NULL; 2769 struct cm_dreq_msg *dreq_msg; 2770 struct cm_drep_msg *drep_msg; 2771 int ret; 2772 2773 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2774 if (ret) 2775 return ret; 2776 2777 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2778 drep_msg = (struct cm_drep_msg *) msg->mad; 2779 2780 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2781 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg, 2782 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg)); 2783 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg, 2784 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)); 2785 2786 trace_icm_issue_drep( 2787 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg), 2788 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)); 2789 ret = ib_post_send_mad(msg, NULL); 2790 if (ret) 2791 cm_free_response_msg(msg); 2792 2793 return ret; 2794 } 2795 2796 static int cm_dreq_handler(struct cm_work *work) 2797 { 2798 struct cm_id_private *cm_id_priv; 2799 struct cm_dreq_msg *dreq_msg; 2800 struct ib_mad_send_buf *msg = NULL; 2801 2802 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2803 cm_id_priv = cm_acquire_id( 2804 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)), 2805 cpu_to_be32(IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg))); 2806 if (!cm_id_priv) { 2807 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 2808 [CM_DREQ_COUNTER]); 2809 cm_issue_drep(work->port, work->mad_recv_wc); 2810 trace_icm_no_priv_err( 2811 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg), 2812 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)); 2813 return -EINVAL; 2814 } 2815 2816 work->cm_event.private_data = 2817 IBA_GET_MEM_PTR(CM_DREQ_PRIVATE_DATA, dreq_msg); 2818 2819 spin_lock_irq(&cm_id_priv->lock); 2820 if (cm_id_priv->local_qpn != 2821 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg))) 2822 goto unlock; 2823 2824 switch (cm_id_priv->id.state) { 2825 case IB_CM_REP_SENT: 2826 case IB_CM_DREQ_SENT: 2827 case IB_CM_MRA_REP_RCVD: 2828 ib_cancel_mad(cm_id_priv->msg); 2829 break; 2830 case IB_CM_ESTABLISHED: 2831 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2832 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2833 ib_cancel_mad(cm_id_priv->msg); 2834 break; 2835 case IB_CM_TIMEWAIT: 2836 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 2837 [CM_DREQ_COUNTER]); 2838 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc); 2839 if (IS_ERR(msg)) 2840 goto unlock; 2841 2842 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2843 cm_id_priv->private_data, 2844 cm_id_priv->private_data_len); 2845 spin_unlock_irq(&cm_id_priv->lock); 2846 2847 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || 2848 ib_post_send_mad(msg, NULL)) 2849 cm_free_response_msg(msg); 2850 goto deref; 2851 case IB_CM_DREQ_RCVD: 2852 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 2853 [CM_DREQ_COUNTER]); 2854 goto unlock; 2855 default: 2856 trace_icm_dreq_unknown_err(&cm_id_priv->id); 2857 goto unlock; 2858 } 2859 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2860 cm_id_priv->tid = dreq_msg->hdr.tid; 2861 cm_queue_work_unlock(cm_id_priv, work); 2862 return 0; 2863 2864 unlock: spin_unlock_irq(&cm_id_priv->lock); 2865 deref: cm_deref_id(cm_id_priv); 2866 return -EINVAL; 2867 } 2868 2869 static int cm_drep_handler(struct cm_work *work) 2870 { 2871 struct cm_id_private *cm_id_priv; 2872 struct cm_drep_msg *drep_msg; 2873 2874 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2875 cm_id_priv = cm_acquire_id( 2876 cpu_to_be32(IBA_GET(CM_DREP_REMOTE_COMM_ID, drep_msg)), 2877 cpu_to_be32(IBA_GET(CM_DREP_LOCAL_COMM_ID, drep_msg))); 2878 if (!cm_id_priv) 2879 return -EINVAL; 2880 2881 work->cm_event.private_data = 2882 IBA_GET_MEM_PTR(CM_DREP_PRIVATE_DATA, drep_msg); 2883 2884 spin_lock_irq(&cm_id_priv->lock); 2885 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2886 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2887 spin_unlock_irq(&cm_id_priv->lock); 2888 goto out; 2889 } 2890 cm_enter_timewait(cm_id_priv); 2891 2892 ib_cancel_mad(cm_id_priv->msg); 2893 cm_queue_work_unlock(cm_id_priv, work); 2894 return 0; 2895 out: 2896 cm_deref_id(cm_id_priv); 2897 return -EINVAL; 2898 } 2899 2900 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv, 2901 enum ib_cm_rej_reason reason, void *ari, 2902 u8 ari_length, const void *private_data, 2903 u8 private_data_len) 2904 { 2905 enum ib_cm_state state = cm_id_priv->id.state; 2906 struct ib_mad_send_buf *msg; 2907 int ret; 2908 2909 lockdep_assert_held(&cm_id_priv->lock); 2910 2911 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2912 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2913 return -EINVAL; 2914 2915 switch (state) { 2916 case IB_CM_REQ_SENT: 2917 case IB_CM_MRA_REQ_RCVD: 2918 case IB_CM_REQ_RCVD: 2919 case IB_CM_MRA_REQ_SENT: 2920 case IB_CM_REP_RCVD: 2921 case IB_CM_MRA_REP_SENT: 2922 cm_reset_to_idle(cm_id_priv); 2923 msg = cm_alloc_msg(cm_id_priv); 2924 if (IS_ERR(msg)) 2925 return PTR_ERR(msg); 2926 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason, 2927 ari, ari_length, private_data, private_data_len, 2928 state); 2929 break; 2930 case IB_CM_REP_SENT: 2931 case IB_CM_MRA_REP_RCVD: 2932 cm_enter_timewait(cm_id_priv); 2933 msg = cm_alloc_msg(cm_id_priv); 2934 if (IS_ERR(msg)) 2935 return PTR_ERR(msg); 2936 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason, 2937 ari, ari_length, private_data, private_data_len, 2938 state); 2939 break; 2940 default: 2941 trace_icm_send_unknown_rej_err(&cm_id_priv->id); 2942 return -EINVAL; 2943 } 2944 2945 trace_icm_send_rej(&cm_id_priv->id, reason); 2946 ret = ib_post_send_mad(msg, NULL); 2947 if (ret) { 2948 cm_free_msg(msg); 2949 return ret; 2950 } 2951 2952 return 0; 2953 } 2954 2955 int ib_send_cm_rej(struct ib_cm_id *cm_id, enum ib_cm_rej_reason reason, 2956 void *ari, u8 ari_length, const void *private_data, 2957 u8 private_data_len) 2958 { 2959 struct cm_id_private *cm_id_priv = 2960 container_of(cm_id, struct cm_id_private, id); 2961 unsigned long flags; 2962 int ret; 2963 2964 spin_lock_irqsave(&cm_id_priv->lock, flags); 2965 ret = cm_send_rej_locked(cm_id_priv, reason, ari, ari_length, 2966 private_data, private_data_len); 2967 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2968 return ret; 2969 } 2970 EXPORT_SYMBOL(ib_send_cm_rej); 2971 2972 static void cm_format_rej_event(struct cm_work *work) 2973 { 2974 struct cm_rej_msg *rej_msg; 2975 struct ib_cm_rej_event_param *param; 2976 2977 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2978 param = &work->cm_event.param.rej_rcvd; 2979 param->ari = IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg); 2980 param->ari_length = IBA_GET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg); 2981 param->reason = IBA_GET(CM_REJ_REASON, rej_msg); 2982 work->cm_event.private_data = 2983 IBA_GET_MEM_PTR(CM_REJ_PRIVATE_DATA, rej_msg); 2984 } 2985 2986 static struct cm_id_private *cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2987 { 2988 struct cm_id_private *cm_id_priv; 2989 __be32 remote_id; 2990 2991 remote_id = cpu_to_be32(IBA_GET(CM_REJ_LOCAL_COMM_ID, rej_msg)); 2992 2993 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_TIMEOUT) { 2994 cm_id_priv = cm_find_remote_id( 2995 *((__be64 *)IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg)), 2996 remote_id); 2997 } else if (IBA_GET(CM_REJ_MESSAGE_REJECTED, rej_msg) == 2998 CM_MSG_RESPONSE_REQ) 2999 cm_id_priv = cm_acquire_id( 3000 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)), 3001 0); 3002 else 3003 cm_id_priv = cm_acquire_id( 3004 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)), 3005 remote_id); 3006 3007 return cm_id_priv; 3008 } 3009 3010 static int cm_rej_handler(struct cm_work *work) 3011 { 3012 struct cm_id_private *cm_id_priv; 3013 struct cm_rej_msg *rej_msg; 3014 3015 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 3016 cm_id_priv = cm_acquire_rejected_id(rej_msg); 3017 if (!cm_id_priv) 3018 return -EINVAL; 3019 3020 cm_format_rej_event(work); 3021 3022 spin_lock_irq(&cm_id_priv->lock); 3023 switch (cm_id_priv->id.state) { 3024 case IB_CM_REQ_SENT: 3025 case IB_CM_MRA_REQ_RCVD: 3026 case IB_CM_REP_SENT: 3027 case IB_CM_MRA_REP_RCVD: 3028 ib_cancel_mad(cm_id_priv->msg); 3029 fallthrough; 3030 case IB_CM_REQ_RCVD: 3031 case IB_CM_MRA_REQ_SENT: 3032 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_STALE_CONN) 3033 cm_enter_timewait(cm_id_priv); 3034 else 3035 cm_reset_to_idle(cm_id_priv); 3036 break; 3037 case IB_CM_DREQ_SENT: 3038 ib_cancel_mad(cm_id_priv->msg); 3039 fallthrough; 3040 case IB_CM_REP_RCVD: 3041 case IB_CM_MRA_REP_SENT: 3042 cm_enter_timewait(cm_id_priv); 3043 break; 3044 case IB_CM_ESTABLISHED: 3045 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT || 3046 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) { 3047 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT) 3048 ib_cancel_mad(cm_id_priv->msg); 3049 cm_enter_timewait(cm_id_priv); 3050 break; 3051 } 3052 fallthrough; 3053 default: 3054 trace_icm_rej_unknown_err(&cm_id_priv->id); 3055 spin_unlock_irq(&cm_id_priv->lock); 3056 goto out; 3057 } 3058 3059 cm_queue_work_unlock(cm_id_priv, work); 3060 return 0; 3061 out: 3062 cm_deref_id(cm_id_priv); 3063 return -EINVAL; 3064 } 3065 3066 int ib_send_cm_mra(struct ib_cm_id *cm_id, 3067 u8 service_timeout, 3068 const void *private_data, 3069 u8 private_data_len) 3070 { 3071 struct cm_id_private *cm_id_priv; 3072 struct ib_mad_send_buf *msg; 3073 enum ib_cm_state cm_state; 3074 enum ib_cm_lap_state lap_state; 3075 enum cm_msg_response msg_response; 3076 void *data; 3077 unsigned long flags; 3078 int ret; 3079 3080 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 3081 return -EINVAL; 3082 3083 data = cm_copy_private_data(private_data, private_data_len); 3084 if (IS_ERR(data)) 3085 return PTR_ERR(data); 3086 3087 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3088 3089 spin_lock_irqsave(&cm_id_priv->lock, flags); 3090 switch (cm_id_priv->id.state) { 3091 case IB_CM_REQ_RCVD: 3092 cm_state = IB_CM_MRA_REQ_SENT; 3093 lap_state = cm_id->lap_state; 3094 msg_response = CM_MSG_RESPONSE_REQ; 3095 break; 3096 case IB_CM_REP_RCVD: 3097 cm_state = IB_CM_MRA_REP_SENT; 3098 lap_state = cm_id->lap_state; 3099 msg_response = CM_MSG_RESPONSE_REP; 3100 break; 3101 case IB_CM_ESTABLISHED: 3102 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 3103 cm_state = cm_id->state; 3104 lap_state = IB_CM_MRA_LAP_SENT; 3105 msg_response = CM_MSG_RESPONSE_OTHER; 3106 break; 3107 } 3108 fallthrough; 3109 default: 3110 trace_icm_send_mra_unknown_err(&cm_id_priv->id); 3111 ret = -EINVAL; 3112 goto error_unlock; 3113 } 3114 3115 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 3116 msg = cm_alloc_msg(cm_id_priv); 3117 if (IS_ERR(msg)) { 3118 ret = PTR_ERR(msg); 3119 goto error_unlock; 3120 } 3121 3122 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 3123 msg_response, service_timeout, 3124 private_data, private_data_len); 3125 trace_icm_send_mra(cm_id); 3126 ret = ib_post_send_mad(msg, NULL); 3127 if (ret) 3128 goto error_free_msg; 3129 } 3130 3131 cm_id->state = cm_state; 3132 cm_id->lap_state = lap_state; 3133 cm_id_priv->service_timeout = service_timeout; 3134 cm_set_private_data(cm_id_priv, data, private_data_len); 3135 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3136 return 0; 3137 3138 error_free_msg: 3139 cm_free_msg(msg); 3140 error_unlock: 3141 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3142 kfree(data); 3143 return ret; 3144 } 3145 EXPORT_SYMBOL(ib_send_cm_mra); 3146 3147 static struct cm_id_private *cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 3148 { 3149 switch (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg)) { 3150 case CM_MSG_RESPONSE_REQ: 3151 return cm_acquire_id( 3152 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)), 3153 0); 3154 case CM_MSG_RESPONSE_REP: 3155 case CM_MSG_RESPONSE_OTHER: 3156 return cm_acquire_id( 3157 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)), 3158 cpu_to_be32(IBA_GET(CM_MRA_LOCAL_COMM_ID, mra_msg))); 3159 default: 3160 return NULL; 3161 } 3162 } 3163 3164 static int cm_mra_handler(struct cm_work *work) 3165 { 3166 struct cm_id_private *cm_id_priv; 3167 struct cm_mra_msg *mra_msg; 3168 int timeout; 3169 3170 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 3171 cm_id_priv = cm_acquire_mraed_id(mra_msg); 3172 if (!cm_id_priv) 3173 return -EINVAL; 3174 3175 work->cm_event.private_data = 3176 IBA_GET_MEM_PTR(CM_MRA_PRIVATE_DATA, mra_msg); 3177 work->cm_event.param.mra_rcvd.service_timeout = 3178 IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg); 3179 timeout = cm_convert_to_ms(IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg)) + 3180 cm_convert_to_ms(cm_id_priv->av.timeout); 3181 3182 spin_lock_irq(&cm_id_priv->lock); 3183 switch (cm_id_priv->id.state) { 3184 case IB_CM_REQ_SENT: 3185 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != 3186 CM_MSG_RESPONSE_REQ || 3187 ib_modify_mad(cm_id_priv->msg, timeout)) 3188 goto out; 3189 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 3190 break; 3191 case IB_CM_REP_SENT: 3192 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != 3193 CM_MSG_RESPONSE_REP || 3194 ib_modify_mad(cm_id_priv->msg, timeout)) 3195 goto out; 3196 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 3197 break; 3198 case IB_CM_ESTABLISHED: 3199 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != 3200 CM_MSG_RESPONSE_OTHER || 3201 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 3202 ib_modify_mad(cm_id_priv->msg, timeout)) { 3203 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 3204 atomic_long_inc( 3205 &work->port->counters[CM_RECV_DUPLICATES] 3206 [CM_MRA_COUNTER]); 3207 goto out; 3208 } 3209 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 3210 break; 3211 case IB_CM_MRA_REQ_RCVD: 3212 case IB_CM_MRA_REP_RCVD: 3213 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 3214 [CM_MRA_COUNTER]); 3215 fallthrough; 3216 default: 3217 trace_icm_mra_unknown_err(&cm_id_priv->id); 3218 goto out; 3219 } 3220 3221 cm_id_priv->msg->context[1] = (void *) (unsigned long) 3222 cm_id_priv->id.state; 3223 cm_queue_work_unlock(cm_id_priv, work); 3224 return 0; 3225 out: 3226 spin_unlock_irq(&cm_id_priv->lock); 3227 cm_deref_id(cm_id_priv); 3228 return -EINVAL; 3229 } 3230 3231 static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg, 3232 struct sa_path_rec *path) 3233 { 3234 u32 lid; 3235 3236 if (path->rec_type != SA_PATH_REC_TYPE_OPA) { 3237 sa_path_set_dlid(path, IBA_GET(CM_LAP_ALTERNATE_LOCAL_PORT_LID, 3238 lap_msg)); 3239 sa_path_set_slid(path, IBA_GET(CM_LAP_ALTERNATE_REMOTE_PORT_LID, 3240 lap_msg)); 3241 } else { 3242 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 3243 CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg)); 3244 sa_path_set_dlid(path, lid); 3245 3246 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 3247 CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg)); 3248 sa_path_set_slid(path, lid); 3249 } 3250 } 3251 3252 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 3253 struct sa_path_rec *path, 3254 struct cm_lap_msg *lap_msg) 3255 { 3256 path->dgid = *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg); 3257 path->sgid = 3258 *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg); 3259 path->flow_label = 3260 cpu_to_be32(IBA_GET(CM_LAP_ALTERNATE_FLOW_LABEL, lap_msg)); 3261 path->hop_limit = IBA_GET(CM_LAP_ALTERNATE_HOP_LIMIT, lap_msg); 3262 path->traffic_class = IBA_GET(CM_LAP_ALTERNATE_TRAFFIC_CLASS, lap_msg); 3263 path->reversible = 1; 3264 path->pkey = cm_id_priv->pkey; 3265 path->sl = IBA_GET(CM_LAP_ALTERNATE_SL, lap_msg); 3266 path->mtu_selector = IB_SA_EQ; 3267 path->mtu = cm_id_priv->path_mtu; 3268 path->rate_selector = IB_SA_EQ; 3269 path->rate = IBA_GET(CM_LAP_ALTERNATE_PACKET_RATE, lap_msg); 3270 path->packet_life_time_selector = IB_SA_EQ; 3271 path->packet_life_time = 3272 IBA_GET(CM_LAP_ALTERNATE_LOCAL_ACK_TIMEOUT, lap_msg); 3273 path->packet_life_time -= (path->packet_life_time > 0); 3274 cm_format_path_lid_from_lap(lap_msg, path); 3275 } 3276 3277 static int cm_lap_handler(struct cm_work *work) 3278 { 3279 struct cm_id_private *cm_id_priv; 3280 struct cm_lap_msg *lap_msg; 3281 struct ib_cm_lap_event_param *param; 3282 struct ib_mad_send_buf *msg = NULL; 3283 struct rdma_ah_attr ah_attr; 3284 struct cm_av alt_av = {}; 3285 int ret; 3286 3287 /* Currently Alternate path messages are not supported for 3288 * RoCE link layer. 3289 */ 3290 if (rdma_protocol_roce(work->port->cm_dev->ib_device, 3291 work->port->port_num)) 3292 return -EINVAL; 3293 3294 /* todo: verify LAP request and send reject APR if invalid. */ 3295 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 3296 cm_id_priv = cm_acquire_id( 3297 cpu_to_be32(IBA_GET(CM_LAP_REMOTE_COMM_ID, lap_msg)), 3298 cpu_to_be32(IBA_GET(CM_LAP_LOCAL_COMM_ID, lap_msg))); 3299 if (!cm_id_priv) 3300 return -EINVAL; 3301 3302 param = &work->cm_event.param.lap_rcvd; 3303 memset(&work->path[0], 0, sizeof(work->path[1])); 3304 cm_path_set_rec_type(work->port->cm_dev->ib_device, 3305 work->port->port_num, &work->path[0], 3306 IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, 3307 lap_msg)); 3308 param->alternate_path = &work->path[0]; 3309 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 3310 work->cm_event.private_data = 3311 IBA_GET_MEM_PTR(CM_LAP_PRIVATE_DATA, lap_msg); 3312 3313 ret = ib_init_ah_attr_from_wc(work->port->cm_dev->ib_device, 3314 work->port->port_num, 3315 work->mad_recv_wc->wc, 3316 work->mad_recv_wc->recv_buf.grh, 3317 &ah_attr); 3318 if (ret) 3319 goto deref; 3320 3321 ret = cm_init_av_by_path(param->alternate_path, NULL, &alt_av); 3322 if (ret) { 3323 rdma_destroy_ah_attr(&ah_attr); 3324 goto deref; 3325 } 3326 3327 spin_lock_irq(&cm_id_priv->lock); 3328 cm_init_av_for_lap(work->port, work->mad_recv_wc->wc, 3329 &ah_attr, &cm_id_priv->av); 3330 cm_move_av_from_path(&cm_id_priv->alt_av, &alt_av); 3331 3332 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 3333 goto unlock; 3334 3335 switch (cm_id_priv->id.lap_state) { 3336 case IB_CM_LAP_UNINIT: 3337 case IB_CM_LAP_IDLE: 3338 break; 3339 case IB_CM_MRA_LAP_SENT: 3340 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 3341 [CM_LAP_COUNTER]); 3342 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc); 3343 if (IS_ERR(msg)) 3344 goto unlock; 3345 3346 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 3347 CM_MSG_RESPONSE_OTHER, 3348 cm_id_priv->service_timeout, 3349 cm_id_priv->private_data, 3350 cm_id_priv->private_data_len); 3351 spin_unlock_irq(&cm_id_priv->lock); 3352 3353 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || 3354 ib_post_send_mad(msg, NULL)) 3355 cm_free_response_msg(msg); 3356 goto deref; 3357 case IB_CM_LAP_RCVD: 3358 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 3359 [CM_LAP_COUNTER]); 3360 goto unlock; 3361 default: 3362 goto unlock; 3363 } 3364 3365 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 3366 cm_id_priv->tid = lap_msg->hdr.tid; 3367 cm_queue_work_unlock(cm_id_priv, work); 3368 return 0; 3369 3370 unlock: spin_unlock_irq(&cm_id_priv->lock); 3371 deref: cm_deref_id(cm_id_priv); 3372 return -EINVAL; 3373 } 3374 3375 static int cm_apr_handler(struct cm_work *work) 3376 { 3377 struct cm_id_private *cm_id_priv; 3378 struct cm_apr_msg *apr_msg; 3379 3380 /* Currently Alternate path messages are not supported for 3381 * RoCE link layer. 3382 */ 3383 if (rdma_protocol_roce(work->port->cm_dev->ib_device, 3384 work->port->port_num)) 3385 return -EINVAL; 3386 3387 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 3388 cm_id_priv = cm_acquire_id( 3389 cpu_to_be32(IBA_GET(CM_APR_REMOTE_COMM_ID, apr_msg)), 3390 cpu_to_be32(IBA_GET(CM_APR_LOCAL_COMM_ID, apr_msg))); 3391 if (!cm_id_priv) 3392 return -EINVAL; /* Unmatched reply. */ 3393 3394 work->cm_event.param.apr_rcvd.ap_status = 3395 IBA_GET(CM_APR_AR_STATUS, apr_msg); 3396 work->cm_event.param.apr_rcvd.apr_info = 3397 IBA_GET_MEM_PTR(CM_APR_ADDITIONAL_INFORMATION, apr_msg); 3398 work->cm_event.param.apr_rcvd.info_len = 3399 IBA_GET(CM_APR_ADDITIONAL_INFORMATION_LENGTH, apr_msg); 3400 work->cm_event.private_data = 3401 IBA_GET_MEM_PTR(CM_APR_PRIVATE_DATA, apr_msg); 3402 3403 spin_lock_irq(&cm_id_priv->lock); 3404 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 3405 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 3406 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 3407 spin_unlock_irq(&cm_id_priv->lock); 3408 goto out; 3409 } 3410 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 3411 ib_cancel_mad(cm_id_priv->msg); 3412 cm_queue_work_unlock(cm_id_priv, work); 3413 return 0; 3414 out: 3415 cm_deref_id(cm_id_priv); 3416 return -EINVAL; 3417 } 3418 3419 static int cm_timewait_handler(struct cm_work *work) 3420 { 3421 struct cm_timewait_info *timewait_info; 3422 struct cm_id_private *cm_id_priv; 3423 3424 timewait_info = container_of(work, struct cm_timewait_info, work); 3425 spin_lock_irq(&cm.lock); 3426 list_del(&timewait_info->list); 3427 spin_unlock_irq(&cm.lock); 3428 3429 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 3430 timewait_info->work.remote_id); 3431 if (!cm_id_priv) 3432 return -EINVAL; 3433 3434 spin_lock_irq(&cm_id_priv->lock); 3435 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 3436 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 3437 spin_unlock_irq(&cm_id_priv->lock); 3438 goto out; 3439 } 3440 cm_id_priv->id.state = IB_CM_IDLE; 3441 cm_queue_work_unlock(cm_id_priv, work); 3442 return 0; 3443 out: 3444 cm_deref_id(cm_id_priv); 3445 return -EINVAL; 3446 } 3447 3448 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 3449 struct cm_id_private *cm_id_priv, 3450 struct ib_cm_sidr_req_param *param) 3451 { 3452 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 3453 cm_form_tid(cm_id_priv)); 3454 IBA_SET(CM_SIDR_REQ_REQUESTID, sidr_req_msg, 3455 be32_to_cpu(cm_id_priv->id.local_id)); 3456 IBA_SET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg, 3457 be16_to_cpu(param->path->pkey)); 3458 IBA_SET(CM_SIDR_REQ_SERVICEID, sidr_req_msg, 3459 be64_to_cpu(param->service_id)); 3460 3461 if (param->private_data && param->private_data_len) 3462 IBA_SET_MEM(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg, 3463 param->private_data, param->private_data_len); 3464 } 3465 3466 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 3467 struct ib_cm_sidr_req_param *param) 3468 { 3469 struct cm_id_private *cm_id_priv; 3470 struct ib_mad_send_buf *msg; 3471 struct cm_av av = {}; 3472 unsigned long flags; 3473 int ret; 3474 3475 if (!param->path || (param->private_data && 3476 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 3477 return -EINVAL; 3478 3479 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3480 ret = cm_init_av_by_path(param->path, param->sgid_attr, &av); 3481 if (ret) 3482 return ret; 3483 3484 spin_lock_irqsave(&cm_id_priv->lock, flags); 3485 cm_move_av_from_path(&cm_id_priv->av, &av); 3486 cm_id->service_id = param->service_id; 3487 cm_id->service_mask = ~cpu_to_be64(0); 3488 cm_id_priv->timeout_ms = param->timeout_ms; 3489 cm_id_priv->max_cm_retries = param->max_cm_retries; 3490 if (cm_id->state != IB_CM_IDLE) { 3491 ret = -EINVAL; 3492 goto out_unlock; 3493 } 3494 3495 msg = cm_alloc_priv_msg(cm_id_priv); 3496 if (IS_ERR(msg)) { 3497 ret = PTR_ERR(msg); 3498 goto out_unlock; 3499 } 3500 3501 cm_format_sidr_req((struct cm_sidr_req_msg *)msg->mad, cm_id_priv, 3502 param); 3503 msg->timeout_ms = cm_id_priv->timeout_ms; 3504 msg->context[1] = (void *)(unsigned long)IB_CM_SIDR_REQ_SENT; 3505 3506 trace_icm_send_sidr_req(&cm_id_priv->id); 3507 ret = ib_post_send_mad(msg, NULL); 3508 if (ret) 3509 goto out_free; 3510 cm_id->state = IB_CM_SIDR_REQ_SENT; 3511 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3512 return 0; 3513 out_free: 3514 cm_free_priv_msg(msg); 3515 out_unlock: 3516 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3517 return ret; 3518 } 3519 EXPORT_SYMBOL(ib_send_cm_sidr_req); 3520 3521 static void cm_format_sidr_req_event(struct cm_work *work, 3522 const struct cm_id_private *rx_cm_id, 3523 struct ib_cm_id *listen_id) 3524 { 3525 struct cm_sidr_req_msg *sidr_req_msg; 3526 struct ib_cm_sidr_req_event_param *param; 3527 3528 sidr_req_msg = (struct cm_sidr_req_msg *) 3529 work->mad_recv_wc->recv_buf.mad; 3530 param = &work->cm_event.param.sidr_req_rcvd; 3531 param->pkey = IBA_GET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg); 3532 param->listen_id = listen_id; 3533 param->service_id = 3534 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg)); 3535 param->bth_pkey = cm_get_bth_pkey(work); 3536 param->port = work->port->port_num; 3537 param->sgid_attr = rx_cm_id->av.ah_attr.grh.sgid_attr; 3538 work->cm_event.private_data = 3539 IBA_GET_MEM_PTR(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg); 3540 } 3541 3542 static int cm_sidr_req_handler(struct cm_work *work) 3543 { 3544 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 3545 struct cm_sidr_req_msg *sidr_req_msg; 3546 struct ib_wc *wc; 3547 int ret; 3548 3549 cm_id_priv = 3550 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL); 3551 if (IS_ERR(cm_id_priv)) 3552 return PTR_ERR(cm_id_priv); 3553 3554 /* Record SGID/SLID and request ID for lookup. */ 3555 sidr_req_msg = (struct cm_sidr_req_msg *) 3556 work->mad_recv_wc->recv_buf.mad; 3557 3558 cm_id_priv->id.remote_id = 3559 cpu_to_be32(IBA_GET(CM_SIDR_REQ_REQUESTID, sidr_req_msg)); 3560 cm_id_priv->id.service_id = 3561 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg)); 3562 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 3563 cm_id_priv->tid = sidr_req_msg->hdr.tid; 3564 3565 wc = work->mad_recv_wc->wc; 3566 cm_id_priv->sidr_slid = wc->slid; 3567 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 3568 work->mad_recv_wc->recv_buf.grh, 3569 &cm_id_priv->av); 3570 if (ret) 3571 goto out; 3572 3573 spin_lock_irq(&cm.lock); 3574 listen_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 3575 if (listen_cm_id_priv) { 3576 spin_unlock_irq(&cm.lock); 3577 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 3578 [CM_SIDR_REQ_COUNTER]); 3579 goto out; /* Duplicate message. */ 3580 } 3581 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3582 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 3583 cm_id_priv->id.service_id); 3584 if (!listen_cm_id_priv) { 3585 spin_unlock_irq(&cm.lock); 3586 ib_send_cm_sidr_rep(&cm_id_priv->id, 3587 &(struct ib_cm_sidr_rep_param){ 3588 .status = IB_SIDR_UNSUPPORTED }); 3589 goto out; /* No match. */ 3590 } 3591 spin_unlock_irq(&cm.lock); 3592 3593 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 3594 cm_id_priv->id.context = listen_cm_id_priv->id.context; 3595 3596 /* 3597 * A SIDR ID does not need to be in the xarray since it does not receive 3598 * mads, is not placed in the remote_id or remote_qpn rbtree, and does 3599 * not enter timewait. 3600 */ 3601 3602 cm_format_sidr_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 3603 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 3604 cm_free_work(work); 3605 /* 3606 * A pointer to the listen_cm_id is held in the event, so this deref 3607 * must be after the event is delivered above. 3608 */ 3609 cm_deref_id(listen_cm_id_priv); 3610 if (ret) 3611 cm_destroy_id(&cm_id_priv->id, ret); 3612 return 0; 3613 out: 3614 ib_destroy_cm_id(&cm_id_priv->id); 3615 return -EINVAL; 3616 } 3617 3618 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3619 struct cm_id_private *cm_id_priv, 3620 struct ib_cm_sidr_rep_param *param) 3621 { 3622 cm_format_mad_ece_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3623 cm_id_priv->tid, param->ece.attr_mod); 3624 IBA_SET(CM_SIDR_REP_REQUESTID, sidr_rep_msg, 3625 be32_to_cpu(cm_id_priv->id.remote_id)); 3626 IBA_SET(CM_SIDR_REP_STATUS, sidr_rep_msg, param->status); 3627 IBA_SET(CM_SIDR_REP_QPN, sidr_rep_msg, param->qp_num); 3628 IBA_SET(CM_SIDR_REP_SERVICEID, sidr_rep_msg, 3629 be64_to_cpu(cm_id_priv->id.service_id)); 3630 IBA_SET(CM_SIDR_REP_Q_KEY, sidr_rep_msg, param->qkey); 3631 IBA_SET(CM_SIDR_REP_VENDOR_ID_L, sidr_rep_msg, 3632 param->ece.vendor_id & 0xFF); 3633 IBA_SET(CM_SIDR_REP_VENDOR_ID_H, sidr_rep_msg, 3634 (param->ece.vendor_id >> 8) & 0xFF); 3635 3636 if (param->info && param->info_length) 3637 IBA_SET_MEM(CM_SIDR_REP_ADDITIONAL_INFORMATION, sidr_rep_msg, 3638 param->info, param->info_length); 3639 3640 if (param->private_data && param->private_data_len) 3641 IBA_SET_MEM(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg, 3642 param->private_data, param->private_data_len); 3643 } 3644 3645 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv, 3646 struct ib_cm_sidr_rep_param *param) 3647 { 3648 struct ib_mad_send_buf *msg; 3649 unsigned long flags; 3650 int ret; 3651 3652 lockdep_assert_held(&cm_id_priv->lock); 3653 3654 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3655 (param->private_data && 3656 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3657 return -EINVAL; 3658 3659 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_RCVD) 3660 return -EINVAL; 3661 3662 msg = cm_alloc_msg(cm_id_priv); 3663 if (IS_ERR(msg)) 3664 return PTR_ERR(msg); 3665 3666 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3667 param); 3668 trace_icm_send_sidr_rep(&cm_id_priv->id); 3669 ret = ib_post_send_mad(msg, NULL); 3670 if (ret) { 3671 cm_free_msg(msg); 3672 return ret; 3673 } 3674 cm_id_priv->id.state = IB_CM_IDLE; 3675 spin_lock_irqsave(&cm.lock, flags); 3676 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) { 3677 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3678 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); 3679 } 3680 spin_unlock_irqrestore(&cm.lock, flags); 3681 return 0; 3682 } 3683 3684 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3685 struct ib_cm_sidr_rep_param *param) 3686 { 3687 struct cm_id_private *cm_id_priv = 3688 container_of(cm_id, struct cm_id_private, id); 3689 unsigned long flags; 3690 int ret; 3691 3692 spin_lock_irqsave(&cm_id_priv->lock, flags); 3693 ret = cm_send_sidr_rep_locked(cm_id_priv, param); 3694 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3695 return ret; 3696 } 3697 EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3698 3699 static void cm_format_sidr_rep_event(struct cm_work *work, 3700 const struct cm_id_private *cm_id_priv) 3701 { 3702 struct cm_sidr_rep_msg *sidr_rep_msg; 3703 struct ib_cm_sidr_rep_event_param *param; 3704 3705 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3706 work->mad_recv_wc->recv_buf.mad; 3707 param = &work->cm_event.param.sidr_rep_rcvd; 3708 param->status = IBA_GET(CM_SIDR_REP_STATUS, sidr_rep_msg); 3709 param->qkey = IBA_GET(CM_SIDR_REP_Q_KEY, sidr_rep_msg); 3710 param->qpn = IBA_GET(CM_SIDR_REP_QPN, sidr_rep_msg); 3711 param->info = IBA_GET_MEM_PTR(CM_SIDR_REP_ADDITIONAL_INFORMATION, 3712 sidr_rep_msg); 3713 param->info_len = IBA_GET(CM_SIDR_REP_ADDITIONAL_INFORMATION_LENGTH, 3714 sidr_rep_msg); 3715 param->sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr; 3716 work->cm_event.private_data = 3717 IBA_GET_MEM_PTR(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg); 3718 } 3719 3720 static int cm_sidr_rep_handler(struct cm_work *work) 3721 { 3722 struct cm_sidr_rep_msg *sidr_rep_msg; 3723 struct cm_id_private *cm_id_priv; 3724 3725 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3726 work->mad_recv_wc->recv_buf.mad; 3727 cm_id_priv = cm_acquire_id( 3728 cpu_to_be32(IBA_GET(CM_SIDR_REP_REQUESTID, sidr_rep_msg)), 0); 3729 if (!cm_id_priv) 3730 return -EINVAL; /* Unmatched reply. */ 3731 3732 spin_lock_irq(&cm_id_priv->lock); 3733 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3734 spin_unlock_irq(&cm_id_priv->lock); 3735 goto out; 3736 } 3737 cm_id_priv->id.state = IB_CM_IDLE; 3738 ib_cancel_mad(cm_id_priv->msg); 3739 spin_unlock_irq(&cm_id_priv->lock); 3740 3741 cm_format_sidr_rep_event(work, cm_id_priv); 3742 cm_process_work(cm_id_priv, work); 3743 return 0; 3744 out: 3745 cm_deref_id(cm_id_priv); 3746 return -EINVAL; 3747 } 3748 3749 static void cm_process_send_error(struct cm_id_private *cm_id_priv, 3750 struct ib_mad_send_buf *msg, 3751 enum ib_cm_state state, 3752 enum ib_wc_status wc_status) 3753 { 3754 struct ib_cm_event cm_event = {}; 3755 int ret; 3756 3757 /* Discard old sends or ones without a response. */ 3758 spin_lock_irq(&cm_id_priv->lock); 3759 if (msg != cm_id_priv->msg) { 3760 spin_unlock_irq(&cm_id_priv->lock); 3761 cm_free_msg(msg); 3762 return; 3763 } 3764 cm_free_priv_msg(msg); 3765 3766 if (state != cm_id_priv->id.state || wc_status == IB_WC_SUCCESS || 3767 wc_status == IB_WC_WR_FLUSH_ERR) 3768 goto out_unlock; 3769 3770 trace_icm_mad_send_err(state, wc_status); 3771 switch (state) { 3772 case IB_CM_REQ_SENT: 3773 case IB_CM_MRA_REQ_RCVD: 3774 cm_reset_to_idle(cm_id_priv); 3775 cm_event.event = IB_CM_REQ_ERROR; 3776 break; 3777 case IB_CM_REP_SENT: 3778 case IB_CM_MRA_REP_RCVD: 3779 cm_reset_to_idle(cm_id_priv); 3780 cm_event.event = IB_CM_REP_ERROR; 3781 break; 3782 case IB_CM_DREQ_SENT: 3783 cm_enter_timewait(cm_id_priv); 3784 cm_event.event = IB_CM_DREQ_ERROR; 3785 break; 3786 case IB_CM_SIDR_REQ_SENT: 3787 cm_id_priv->id.state = IB_CM_IDLE; 3788 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3789 break; 3790 default: 3791 goto out_unlock; 3792 } 3793 spin_unlock_irq(&cm_id_priv->lock); 3794 cm_event.param.send_status = wc_status; 3795 3796 /* No other events can occur on the cm_id at this point. */ 3797 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3798 if (ret) 3799 ib_destroy_cm_id(&cm_id_priv->id); 3800 return; 3801 out_unlock: 3802 spin_unlock_irq(&cm_id_priv->lock); 3803 } 3804 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_id_private *cm_id_priv = msg->context[0]; 3810 enum ib_cm_state state = 3811 (enum ib_cm_state)(unsigned long)msg->context[1]; 3812 struct cm_port *port; 3813 u16 attr_index; 3814 3815 port = mad_agent->context; 3816 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3817 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3818 3819 /* 3820 * If the send was in response to a received message (context[0] is not 3821 * set to a cm_id), and is not a REJ, then it is a send that was 3822 * manually retried. 3823 */ 3824 if (!cm_id_priv && (attr_index != CM_REJ_COUNTER)) 3825 msg->retries = 1; 3826 3827 atomic_long_add(1 + msg->retries, &port->counters[CM_XMIT][attr_index]); 3828 if (msg->retries) 3829 atomic_long_add(msg->retries, 3830 &port->counters[CM_XMIT_RETRIES][attr_index]); 3831 3832 if (cm_id_priv) 3833 cm_process_send_error(cm_id_priv, msg, state, 3834 mad_send_wc->status); 3835 else 3836 cm_free_response_msg(msg); 3837 } 3838 3839 static void cm_work_handler(struct work_struct *_work) 3840 { 3841 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3842 int ret; 3843 3844 switch (work->cm_event.event) { 3845 case IB_CM_REQ_RECEIVED: 3846 ret = cm_req_handler(work); 3847 break; 3848 case IB_CM_MRA_RECEIVED: 3849 ret = cm_mra_handler(work); 3850 break; 3851 case IB_CM_REJ_RECEIVED: 3852 ret = cm_rej_handler(work); 3853 break; 3854 case IB_CM_REP_RECEIVED: 3855 ret = cm_rep_handler(work); 3856 break; 3857 case IB_CM_RTU_RECEIVED: 3858 ret = cm_rtu_handler(work); 3859 break; 3860 case IB_CM_USER_ESTABLISHED: 3861 ret = cm_establish_handler(work); 3862 break; 3863 case IB_CM_DREQ_RECEIVED: 3864 ret = cm_dreq_handler(work); 3865 break; 3866 case IB_CM_DREP_RECEIVED: 3867 ret = cm_drep_handler(work); 3868 break; 3869 case IB_CM_SIDR_REQ_RECEIVED: 3870 ret = cm_sidr_req_handler(work); 3871 break; 3872 case IB_CM_SIDR_REP_RECEIVED: 3873 ret = cm_sidr_rep_handler(work); 3874 break; 3875 case IB_CM_LAP_RECEIVED: 3876 ret = cm_lap_handler(work); 3877 break; 3878 case IB_CM_APR_RECEIVED: 3879 ret = cm_apr_handler(work); 3880 break; 3881 case IB_CM_TIMEWAIT_EXIT: 3882 ret = cm_timewait_handler(work); 3883 break; 3884 default: 3885 trace_icm_handler_err(work->cm_event.event); 3886 ret = -EINVAL; 3887 break; 3888 } 3889 if (ret) 3890 cm_free_work(work); 3891 } 3892 3893 static int cm_establish(struct ib_cm_id *cm_id) 3894 { 3895 struct cm_id_private *cm_id_priv; 3896 struct cm_work *work; 3897 unsigned long flags; 3898 int ret = 0; 3899 struct cm_device *cm_dev; 3900 3901 cm_dev = ib_get_client_data(cm_id->device, &cm_client); 3902 if (!cm_dev) 3903 return -ENODEV; 3904 3905 work = kmalloc(sizeof *work, GFP_ATOMIC); 3906 if (!work) 3907 return -ENOMEM; 3908 3909 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3910 spin_lock_irqsave(&cm_id_priv->lock, flags); 3911 switch (cm_id->state) { 3912 case IB_CM_REP_SENT: 3913 case IB_CM_MRA_REP_RCVD: 3914 cm_id->state = IB_CM_ESTABLISHED; 3915 break; 3916 case IB_CM_ESTABLISHED: 3917 ret = -EISCONN; 3918 break; 3919 default: 3920 trace_icm_establish_err(cm_id); 3921 ret = -EINVAL; 3922 break; 3923 } 3924 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3925 3926 if (ret) { 3927 kfree(work); 3928 goto out; 3929 } 3930 3931 /* 3932 * The CM worker thread may try to destroy the cm_id before it 3933 * can execute this work item. To prevent potential deadlock, 3934 * we need to find the cm_id once we're in the context of the 3935 * worker thread, rather than holding a reference on it. 3936 */ 3937 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3938 work->local_id = cm_id->local_id; 3939 work->remote_id = cm_id->remote_id; 3940 work->mad_recv_wc = NULL; 3941 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3942 3943 /* Check if the device started its remove_one */ 3944 spin_lock_irqsave(&cm.lock, flags); 3945 if (!cm_dev->going_down) { 3946 queue_delayed_work(cm.wq, &work->work, 0); 3947 } else { 3948 kfree(work); 3949 ret = -ENODEV; 3950 } 3951 spin_unlock_irqrestore(&cm.lock, flags); 3952 3953 out: 3954 return ret; 3955 } 3956 3957 static int cm_migrate(struct ib_cm_id *cm_id) 3958 { 3959 struct cm_id_private *cm_id_priv; 3960 unsigned long flags; 3961 int ret = 0; 3962 3963 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3964 spin_lock_irqsave(&cm_id_priv->lock, flags); 3965 if (cm_id->state == IB_CM_ESTABLISHED && 3966 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3967 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3968 cm_id->lap_state = IB_CM_LAP_IDLE; 3969 cm_id_priv->av = cm_id_priv->alt_av; 3970 } else 3971 ret = -EINVAL; 3972 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3973 3974 return ret; 3975 } 3976 3977 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3978 { 3979 int ret; 3980 3981 switch (event) { 3982 case IB_EVENT_COMM_EST: 3983 ret = cm_establish(cm_id); 3984 break; 3985 case IB_EVENT_PATH_MIG: 3986 ret = cm_migrate(cm_id); 3987 break; 3988 default: 3989 ret = -EINVAL; 3990 } 3991 return ret; 3992 } 3993 EXPORT_SYMBOL(ib_cm_notify); 3994 3995 static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3996 struct ib_mad_send_buf *send_buf, 3997 struct ib_mad_recv_wc *mad_recv_wc) 3998 { 3999 struct cm_port *port = mad_agent->context; 4000 struct cm_work *work; 4001 enum ib_cm_event_type event; 4002 bool alt_path = false; 4003 u16 attr_id; 4004 int paths = 0; 4005 int going_down = 0; 4006 4007 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 4008 case CM_REQ_ATTR_ID: 4009 alt_path = cm_req_has_alt_path((struct cm_req_msg *) 4010 mad_recv_wc->recv_buf.mad); 4011 paths = 1 + (alt_path != 0); 4012 event = IB_CM_REQ_RECEIVED; 4013 break; 4014 case CM_MRA_ATTR_ID: 4015 event = IB_CM_MRA_RECEIVED; 4016 break; 4017 case CM_REJ_ATTR_ID: 4018 event = IB_CM_REJ_RECEIVED; 4019 break; 4020 case CM_REP_ATTR_ID: 4021 event = IB_CM_REP_RECEIVED; 4022 break; 4023 case CM_RTU_ATTR_ID: 4024 event = IB_CM_RTU_RECEIVED; 4025 break; 4026 case CM_DREQ_ATTR_ID: 4027 event = IB_CM_DREQ_RECEIVED; 4028 break; 4029 case CM_DREP_ATTR_ID: 4030 event = IB_CM_DREP_RECEIVED; 4031 break; 4032 case CM_SIDR_REQ_ATTR_ID: 4033 event = IB_CM_SIDR_REQ_RECEIVED; 4034 break; 4035 case CM_SIDR_REP_ATTR_ID: 4036 event = IB_CM_SIDR_REP_RECEIVED; 4037 break; 4038 case CM_LAP_ATTR_ID: 4039 paths = 1; 4040 event = IB_CM_LAP_RECEIVED; 4041 break; 4042 case CM_APR_ATTR_ID: 4043 event = IB_CM_APR_RECEIVED; 4044 break; 4045 default: 4046 ib_free_recv_mad(mad_recv_wc); 4047 return; 4048 } 4049 4050 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 4051 atomic_long_inc(&port->counters[CM_RECV][attr_id - CM_ATTR_ID_OFFSET]); 4052 4053 work = kmalloc(struct_size(work, path, paths), GFP_KERNEL); 4054 if (!work) { 4055 ib_free_recv_mad(mad_recv_wc); 4056 return; 4057 } 4058 4059 INIT_DELAYED_WORK(&work->work, cm_work_handler); 4060 work->cm_event.event = event; 4061 work->mad_recv_wc = mad_recv_wc; 4062 work->port = port; 4063 4064 /* Check if the device started its remove_one */ 4065 spin_lock_irq(&cm.lock); 4066 if (!port->cm_dev->going_down) 4067 queue_delayed_work(cm.wq, &work->work, 0); 4068 else 4069 going_down = 1; 4070 spin_unlock_irq(&cm.lock); 4071 4072 if (going_down) { 4073 kfree(work); 4074 ib_free_recv_mad(mad_recv_wc); 4075 } 4076 } 4077 4078 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 4079 struct ib_qp_attr *qp_attr, 4080 int *qp_attr_mask) 4081 { 4082 unsigned long flags; 4083 int ret; 4084 4085 spin_lock_irqsave(&cm_id_priv->lock, flags); 4086 switch (cm_id_priv->id.state) { 4087 case IB_CM_REQ_SENT: 4088 case IB_CM_MRA_REQ_RCVD: 4089 case IB_CM_REQ_RCVD: 4090 case IB_CM_MRA_REQ_SENT: 4091 case IB_CM_REP_RCVD: 4092 case IB_CM_MRA_REP_SENT: 4093 case IB_CM_REP_SENT: 4094 case IB_CM_MRA_REP_RCVD: 4095 case IB_CM_ESTABLISHED: 4096 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 4097 IB_QP_PKEY_INDEX | IB_QP_PORT; 4098 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 4099 if (cm_id_priv->responder_resources) 4100 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 4101 IB_ACCESS_REMOTE_ATOMIC; 4102 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 4103 if (cm_id_priv->av.port) 4104 qp_attr->port_num = cm_id_priv->av.port->port_num; 4105 ret = 0; 4106 break; 4107 default: 4108 trace_icm_qp_init_err(&cm_id_priv->id); 4109 ret = -EINVAL; 4110 break; 4111 } 4112 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4113 return ret; 4114 } 4115 4116 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 4117 struct ib_qp_attr *qp_attr, 4118 int *qp_attr_mask) 4119 { 4120 unsigned long flags; 4121 int ret; 4122 4123 spin_lock_irqsave(&cm_id_priv->lock, flags); 4124 switch (cm_id_priv->id.state) { 4125 case IB_CM_REQ_RCVD: 4126 case IB_CM_MRA_REQ_SENT: 4127 case IB_CM_REP_RCVD: 4128 case IB_CM_MRA_REP_SENT: 4129 case IB_CM_REP_SENT: 4130 case IB_CM_MRA_REP_RCVD: 4131 case IB_CM_ESTABLISHED: 4132 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 4133 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 4134 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 4135 qp_attr->path_mtu = cm_id_priv->path_mtu; 4136 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 4137 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 4138 if (cm_id_priv->qp_type == IB_QPT_RC || 4139 cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 4140 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 4141 IB_QP_MIN_RNR_TIMER; 4142 qp_attr->max_dest_rd_atomic = 4143 cm_id_priv->responder_resources; 4144 qp_attr->min_rnr_timer = 0; 4145 } 4146 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr) && 4147 cm_id_priv->alt_av.port) { 4148 *qp_attr_mask |= IB_QP_ALT_PATH; 4149 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 4150 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 4151 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 4152 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 4153 } 4154 ret = 0; 4155 break; 4156 default: 4157 trace_icm_qp_rtr_err(&cm_id_priv->id); 4158 ret = -EINVAL; 4159 break; 4160 } 4161 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4162 return ret; 4163 } 4164 4165 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 4166 struct ib_qp_attr *qp_attr, 4167 int *qp_attr_mask) 4168 { 4169 unsigned long flags; 4170 int ret; 4171 4172 spin_lock_irqsave(&cm_id_priv->lock, flags); 4173 switch (cm_id_priv->id.state) { 4174 /* Allow transition to RTS before sending REP */ 4175 case IB_CM_REQ_RCVD: 4176 case IB_CM_MRA_REQ_SENT: 4177 4178 case IB_CM_REP_RCVD: 4179 case IB_CM_MRA_REP_SENT: 4180 case IB_CM_REP_SENT: 4181 case IB_CM_MRA_REP_RCVD: 4182 case IB_CM_ESTABLISHED: 4183 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 4184 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 4185 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 4186 switch (cm_id_priv->qp_type) { 4187 case IB_QPT_RC: 4188 case IB_QPT_XRC_INI: 4189 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY | 4190 IB_QP_MAX_QP_RD_ATOMIC; 4191 qp_attr->retry_cnt = cm_id_priv->retry_count; 4192 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 4193 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 4194 fallthrough; 4195 case IB_QPT_XRC_TGT: 4196 *qp_attr_mask |= IB_QP_TIMEOUT; 4197 qp_attr->timeout = cm_id_priv->av.timeout; 4198 break; 4199 default: 4200 break; 4201 } 4202 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) { 4203 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 4204 qp_attr->path_mig_state = IB_MIG_REARM; 4205 } 4206 } else { 4207 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 4208 if (cm_id_priv->alt_av.port) 4209 qp_attr->alt_port_num = 4210 cm_id_priv->alt_av.port->port_num; 4211 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 4212 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 4213 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 4214 qp_attr->path_mig_state = IB_MIG_REARM; 4215 } 4216 ret = 0; 4217 break; 4218 default: 4219 trace_icm_qp_rts_err(&cm_id_priv->id); 4220 ret = -EINVAL; 4221 break; 4222 } 4223 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4224 return ret; 4225 } 4226 4227 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 4228 struct ib_qp_attr *qp_attr, 4229 int *qp_attr_mask) 4230 { 4231 struct cm_id_private *cm_id_priv; 4232 int ret; 4233 4234 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 4235 switch (qp_attr->qp_state) { 4236 case IB_QPS_INIT: 4237 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 4238 break; 4239 case IB_QPS_RTR: 4240 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 4241 break; 4242 case IB_QPS_RTS: 4243 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 4244 break; 4245 default: 4246 ret = -EINVAL; 4247 break; 4248 } 4249 return ret; 4250 } 4251 EXPORT_SYMBOL(ib_cm_init_qp_attr); 4252 4253 static ssize_t cm_show_counter(struct ib_device *ibdev, u32 port_num, 4254 struct ib_port_attribute *attr, char *buf) 4255 { 4256 struct cm_counter_attribute *cm_attr = 4257 container_of(attr, struct cm_counter_attribute, attr); 4258 struct cm_device *cm_dev = ib_get_client_data(ibdev, &cm_client); 4259 4260 if (WARN_ON(!cm_dev)) 4261 return -EINVAL; 4262 4263 return sysfs_emit( 4264 buf, "%ld\n", 4265 atomic_long_read( 4266 &cm_dev->port[port_num - 1] 4267 ->counters[cm_attr->group][cm_attr->index])); 4268 } 4269 4270 #define CM_COUNTER_ATTR(_name, _group, _index) \ 4271 { \ 4272 .attr = __ATTR(_name, 0444, cm_show_counter, NULL), \ 4273 .group = _group, .index = _index \ 4274 } 4275 4276 #define CM_COUNTER_GROUP(_group, _name) \ 4277 static struct cm_counter_attribute cm_counter_attr_##_group[] = { \ 4278 CM_COUNTER_ATTR(req, _group, CM_REQ_COUNTER), \ 4279 CM_COUNTER_ATTR(mra, _group, CM_MRA_COUNTER), \ 4280 CM_COUNTER_ATTR(rej, _group, CM_REJ_COUNTER), \ 4281 CM_COUNTER_ATTR(rep, _group, CM_REP_COUNTER), \ 4282 CM_COUNTER_ATTR(rtu, _group, CM_RTU_COUNTER), \ 4283 CM_COUNTER_ATTR(dreq, _group, CM_DREQ_COUNTER), \ 4284 CM_COUNTER_ATTR(drep, _group, CM_DREP_COUNTER), \ 4285 CM_COUNTER_ATTR(sidr_req, _group, CM_SIDR_REQ_COUNTER), \ 4286 CM_COUNTER_ATTR(sidr_rep, _group, CM_SIDR_REP_COUNTER), \ 4287 CM_COUNTER_ATTR(lap, _group, CM_LAP_COUNTER), \ 4288 CM_COUNTER_ATTR(apr, _group, CM_APR_COUNTER), \ 4289 }; \ 4290 static struct attribute *cm_counter_attrs_##_group[] = { \ 4291 &cm_counter_attr_##_group[0].attr.attr, \ 4292 &cm_counter_attr_##_group[1].attr.attr, \ 4293 &cm_counter_attr_##_group[2].attr.attr, \ 4294 &cm_counter_attr_##_group[3].attr.attr, \ 4295 &cm_counter_attr_##_group[4].attr.attr, \ 4296 &cm_counter_attr_##_group[5].attr.attr, \ 4297 &cm_counter_attr_##_group[6].attr.attr, \ 4298 &cm_counter_attr_##_group[7].attr.attr, \ 4299 &cm_counter_attr_##_group[8].attr.attr, \ 4300 &cm_counter_attr_##_group[9].attr.attr, \ 4301 &cm_counter_attr_##_group[10].attr.attr, \ 4302 NULL, \ 4303 }; \ 4304 static const struct attribute_group cm_counter_group_##_group = { \ 4305 .name = _name, \ 4306 .attrs = cm_counter_attrs_##_group, \ 4307 }; 4308 4309 CM_COUNTER_GROUP(CM_XMIT, "cm_tx_msgs") 4310 CM_COUNTER_GROUP(CM_XMIT_RETRIES, "cm_tx_retries") 4311 CM_COUNTER_GROUP(CM_RECV, "cm_rx_msgs") 4312 CM_COUNTER_GROUP(CM_RECV_DUPLICATES, "cm_rx_duplicates") 4313 4314 static const struct attribute_group *cm_counter_groups[] = { 4315 &cm_counter_group_CM_XMIT, 4316 &cm_counter_group_CM_XMIT_RETRIES, 4317 &cm_counter_group_CM_RECV, 4318 &cm_counter_group_CM_RECV_DUPLICATES, 4319 NULL, 4320 }; 4321 4322 static int cm_add_one(struct ib_device *ib_device) 4323 { 4324 struct cm_device *cm_dev; 4325 struct cm_port *port; 4326 struct ib_mad_reg_req reg_req = { 4327 .mgmt_class = IB_MGMT_CLASS_CM, 4328 .mgmt_class_version = IB_CM_CLASS_VERSION, 4329 }; 4330 struct ib_port_modify port_modify = { 4331 .set_port_cap_mask = IB_PORT_CM_SUP 4332 }; 4333 unsigned long flags; 4334 int ret; 4335 int count = 0; 4336 u32 i; 4337 4338 cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt), 4339 GFP_KERNEL); 4340 if (!cm_dev) 4341 return -ENOMEM; 4342 4343 kref_init(&cm_dev->kref); 4344 spin_lock_init(&cm_dev->mad_agent_lock); 4345 cm_dev->ib_device = ib_device; 4346 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay; 4347 cm_dev->going_down = 0; 4348 4349 ib_set_client_data(ib_device, &cm_client, cm_dev); 4350 4351 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 4352 rdma_for_each_port (ib_device, i) { 4353 if (!rdma_cap_ib_cm(ib_device, i)) 4354 continue; 4355 4356 port = kzalloc(sizeof *port, GFP_KERNEL); 4357 if (!port) { 4358 ret = -ENOMEM; 4359 goto error1; 4360 } 4361 4362 cm_dev->port[i-1] = port; 4363 port->cm_dev = cm_dev; 4364 port->port_num = i; 4365 4366 ret = ib_port_register_client_groups(ib_device, i, 4367 cm_counter_groups); 4368 if (ret) 4369 goto error1; 4370 4371 port->mad_agent = ib_register_mad_agent(ib_device, i, 4372 IB_QPT_GSI, 4373 ®_req, 4374 0, 4375 cm_send_handler, 4376 cm_recv_handler, 4377 port, 4378 0); 4379 if (IS_ERR(port->mad_agent)) { 4380 ret = PTR_ERR(port->mad_agent); 4381 goto error2; 4382 } 4383 4384 ret = ib_modify_port(ib_device, i, 0, &port_modify); 4385 if (ret) 4386 goto error3; 4387 4388 count++; 4389 } 4390 4391 if (!count) { 4392 ret = -EOPNOTSUPP; 4393 goto free; 4394 } 4395 4396 write_lock_irqsave(&cm.device_lock, flags); 4397 list_add_tail(&cm_dev->list, &cm.device_list); 4398 write_unlock_irqrestore(&cm.device_lock, flags); 4399 return 0; 4400 4401 error3: 4402 ib_unregister_mad_agent(port->mad_agent); 4403 error2: 4404 ib_port_unregister_client_groups(ib_device, i, cm_counter_groups); 4405 error1: 4406 port_modify.set_port_cap_mask = 0; 4407 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 4408 while (--i) { 4409 if (!rdma_cap_ib_cm(ib_device, i)) 4410 continue; 4411 4412 port = cm_dev->port[i-1]; 4413 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4414 ib_unregister_mad_agent(port->mad_agent); 4415 ib_port_unregister_client_groups(ib_device, i, 4416 cm_counter_groups); 4417 } 4418 free: 4419 cm_device_put(cm_dev); 4420 return ret; 4421 } 4422 4423 static void cm_remove_one(struct ib_device *ib_device, void *client_data) 4424 { 4425 struct cm_device *cm_dev = client_data; 4426 struct cm_port *port; 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 struct ib_mad_agent *mad_agent; 4443 4444 if (!rdma_cap_ib_cm(ib_device, i)) 4445 continue; 4446 4447 port = cm_dev->port[i-1]; 4448 mad_agent = port->mad_agent; 4449 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4450 /* 4451 * We flush the queue here after the going_down set, this 4452 * verify that no new works will be queued in the recv handler, 4453 * after that we can call the unregister_mad_agent 4454 */ 4455 flush_workqueue(cm.wq); 4456 /* 4457 * The above ensures no call paths from the work are running, 4458 * the remaining paths all take the mad_agent_lock. 4459 */ 4460 spin_lock(&cm_dev->mad_agent_lock); 4461 port->mad_agent = NULL; 4462 spin_unlock(&cm_dev->mad_agent_lock); 4463 ib_unregister_mad_agent(mad_agent); 4464 ib_port_unregister_client_groups(ib_device, i, 4465 cm_counter_groups); 4466 } 4467 4468 cm_device_put(cm_dev); 4469 } 4470 4471 static int __init ib_cm_init(void) 4472 { 4473 int ret; 4474 4475 INIT_LIST_HEAD(&cm.device_list); 4476 rwlock_init(&cm.device_lock); 4477 spin_lock_init(&cm.lock); 4478 cm.listen_service_table = RB_ROOT; 4479 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 4480 cm.remote_id_table = RB_ROOT; 4481 cm.remote_qp_table = RB_ROOT; 4482 cm.remote_sidr_table = RB_ROOT; 4483 xa_init_flags(&cm.local_id_table, XA_FLAGS_ALLOC); 4484 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 4485 INIT_LIST_HEAD(&cm.timewait_list); 4486 4487 cm.wq = alloc_workqueue("ib_cm", 0, 1); 4488 if (!cm.wq) { 4489 ret = -ENOMEM; 4490 goto error2; 4491 } 4492 4493 ret = ib_register_client(&cm_client); 4494 if (ret) 4495 goto error3; 4496 4497 return 0; 4498 error3: 4499 destroy_workqueue(cm.wq); 4500 error2: 4501 return ret; 4502 } 4503 4504 static void __exit ib_cm_cleanup(void) 4505 { 4506 struct cm_timewait_info *timewait_info, *tmp; 4507 4508 spin_lock_irq(&cm.lock); 4509 list_for_each_entry(timewait_info, &cm.timewait_list, list) 4510 cancel_delayed_work(&timewait_info->work.work); 4511 spin_unlock_irq(&cm.lock); 4512 4513 ib_unregister_client(&cm_client); 4514 destroy_workqueue(cm.wq); 4515 4516 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 4517 list_del(&timewait_info->list); 4518 kfree(timewait_info); 4519 } 4520 4521 WARN_ON(!xa_empty(&cm.local_id_table)); 4522 } 4523 4524 module_init(ib_cm_init); 4525 module_exit(ib_cm_cleanup); 4526