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 dlid_datapath; 179 u16 pkey_index; 180 u8 timeout; 181 }; 182 183 struct cm_work { 184 struct delayed_work work; 185 struct list_head list; 186 struct cm_port *port; 187 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 188 __be32 local_id; /* Established / timewait */ 189 __be32 remote_id; 190 struct ib_cm_event cm_event; 191 struct sa_path_rec path[]; 192 }; 193 194 struct cm_timewait_info { 195 struct cm_work work; 196 struct list_head list; 197 struct rb_node remote_qp_node; 198 struct rb_node remote_id_node; 199 __be64 remote_ca_guid; 200 __be32 remote_qpn; 201 u8 inserted_remote_qp; 202 u8 inserted_remote_id; 203 }; 204 205 struct cm_id_private { 206 struct ib_cm_id id; 207 208 struct rb_node service_node; 209 struct rb_node sidr_id_node; 210 u32 sidr_slid; 211 spinlock_t lock; /* Do not acquire inside cm.lock */ 212 struct completion comp; 213 refcount_t refcount; 214 /* Number of clients sharing this ib_cm_id. Only valid for listeners. 215 * Protected by the cm.lock spinlock. 216 */ 217 int listen_sharecount; 218 struct rcu_head rcu; 219 220 struct ib_mad_send_buf *msg; 221 struct cm_timewait_info *timewait_info; 222 /* todo: use alternate port on send failure */ 223 struct cm_av av; 224 struct cm_av alt_av; 225 226 void *private_data; 227 __be64 tid; 228 __be32 local_qpn; 229 __be32 remote_qpn; 230 enum ib_qp_type qp_type; 231 __be32 sq_psn; 232 __be32 rq_psn; 233 int timeout_ms; 234 enum ib_mtu path_mtu; 235 __be16 pkey; 236 u8 private_data_len; 237 u8 max_cm_retries; 238 u8 responder_resources; 239 u8 initiator_depth; 240 u8 retry_count; 241 u8 rnr_retry_count; 242 u8 service_timeout; 243 u8 target_ack_delay; 244 245 struct list_head work_list; 246 atomic_t work_count; 247 248 struct rdma_ucm_ece ece; 249 }; 250 251 static void cm_dev_release(struct kref *kref) 252 { 253 struct cm_device *cm_dev = container_of(kref, struct cm_device, kref); 254 u32 i; 255 256 rdma_for_each_port(cm_dev->ib_device, i) 257 kfree(cm_dev->port[i - 1]); 258 259 kfree(cm_dev); 260 } 261 262 static void cm_device_put(struct cm_device *cm_dev) 263 { 264 kref_put(&cm_dev->kref, cm_dev_release); 265 } 266 267 static void cm_work_handler(struct work_struct *work); 268 269 static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 270 { 271 if (refcount_dec_and_test(&cm_id_priv->refcount)) 272 complete(&cm_id_priv->comp); 273 } 274 275 static struct ib_mad_send_buf *cm_alloc_msg(struct cm_id_private *cm_id_priv) 276 { 277 struct ib_mad_agent *mad_agent; 278 struct ib_mad_send_buf *m; 279 struct ib_ah *ah; 280 281 lockdep_assert_held(&cm_id_priv->lock); 282 283 if (!cm_id_priv->av.port) 284 return ERR_PTR(-EINVAL); 285 286 spin_lock(&cm_id_priv->av.port->cm_dev->mad_agent_lock); 287 mad_agent = cm_id_priv->av.port->mad_agent; 288 if (!mad_agent) { 289 m = ERR_PTR(-EINVAL); 290 goto out; 291 } 292 293 ah = rdma_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr, 0); 294 if (IS_ERR(ah)) { 295 m = ERR_CAST(ah); 296 goto out; 297 } 298 299 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 300 cm_id_priv->av.pkey_index, 301 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 302 GFP_ATOMIC, 303 IB_MGMT_BASE_VERSION); 304 if (IS_ERR(m)) { 305 rdma_destroy_ah(ah, 0); 306 goto out; 307 } 308 309 /* Timeout set by caller if response is expected. */ 310 m->ah = ah; 311 m->retries = cm_id_priv->max_cm_retries; 312 313 refcount_inc(&cm_id_priv->refcount); 314 m->context[0] = cm_id_priv; 315 316 out: 317 spin_unlock(&cm_id_priv->av.port->cm_dev->mad_agent_lock); 318 return m; 319 } 320 321 static void cm_free_msg(struct ib_mad_send_buf *msg) 322 { 323 struct cm_id_private *cm_id_priv = msg->context[0]; 324 325 if (msg->ah) 326 rdma_destroy_ah(msg->ah, 0); 327 cm_deref_id(cm_id_priv); 328 ib_free_send_mad(msg); 329 } 330 331 static struct ib_mad_send_buf * 332 cm_alloc_priv_msg(struct cm_id_private *cm_id_priv) 333 { 334 struct ib_mad_send_buf *msg; 335 336 lockdep_assert_held(&cm_id_priv->lock); 337 338 msg = cm_alloc_msg(cm_id_priv); 339 if (IS_ERR(msg)) 340 return msg; 341 cm_id_priv->msg = msg; 342 return msg; 343 } 344 345 static void cm_free_priv_msg(struct ib_mad_send_buf *msg) 346 { 347 struct cm_id_private *cm_id_priv = msg->context[0]; 348 349 lockdep_assert_held(&cm_id_priv->lock); 350 351 if (!WARN_ON(cm_id_priv->msg != msg)) 352 cm_id_priv->msg = NULL; 353 354 if (msg->ah) 355 rdma_destroy_ah(msg->ah, 0); 356 cm_deref_id(cm_id_priv); 357 ib_free_send_mad(msg); 358 } 359 360 static struct ib_mad_send_buf *cm_alloc_response_msg_no_ah(struct cm_port *port, 361 struct ib_mad_recv_wc *mad_recv_wc) 362 { 363 return ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 364 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 365 GFP_ATOMIC, 366 IB_MGMT_BASE_VERSION); 367 } 368 369 static int cm_create_response_msg_ah(struct cm_port *port, 370 struct ib_mad_recv_wc *mad_recv_wc, 371 struct ib_mad_send_buf *msg) 372 { 373 struct ib_ah *ah; 374 375 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 376 mad_recv_wc->recv_buf.grh, port->port_num); 377 if (IS_ERR(ah)) 378 return PTR_ERR(ah); 379 380 msg->ah = ah; 381 return 0; 382 } 383 384 static int cm_alloc_response_msg(struct cm_port *port, 385 struct ib_mad_recv_wc *mad_recv_wc, 386 struct ib_mad_send_buf **msg) 387 { 388 struct ib_mad_send_buf *m; 389 int ret; 390 391 m = cm_alloc_response_msg_no_ah(port, mad_recv_wc); 392 if (IS_ERR(m)) 393 return PTR_ERR(m); 394 395 ret = cm_create_response_msg_ah(port, mad_recv_wc, m); 396 if (ret) { 397 ib_free_send_mad(m); 398 return ret; 399 } 400 401 *msg = m; 402 return 0; 403 } 404 405 static void cm_free_response_msg(struct ib_mad_send_buf *msg) 406 { 407 if (msg->ah) 408 rdma_destroy_ah(msg->ah, 0); 409 ib_free_send_mad(msg); 410 } 411 412 static void *cm_copy_private_data(const void *private_data, u8 private_data_len) 413 { 414 void *data; 415 416 if (!private_data || !private_data_len) 417 return NULL; 418 419 data = kmemdup(private_data, private_data_len, GFP_KERNEL); 420 if (!data) 421 return ERR_PTR(-ENOMEM); 422 423 return data; 424 } 425 426 static void cm_set_private_data(struct cm_id_private *cm_id_priv, 427 void *private_data, u8 private_data_len) 428 { 429 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 430 kfree(cm_id_priv->private_data); 431 432 cm_id_priv->private_data = private_data; 433 cm_id_priv->private_data_len = private_data_len; 434 } 435 436 static void cm_set_av_port(struct cm_av *av, struct cm_port *port) 437 { 438 struct cm_port *old_port = av->port; 439 440 if (old_port == port) 441 return; 442 443 av->port = port; 444 if (old_port) 445 cm_device_put(old_port->cm_dev); 446 if (port) 447 kref_get(&port->cm_dev->kref); 448 } 449 450 static void cm_init_av_for_lap(struct cm_port *port, struct ib_wc *wc, 451 struct rdma_ah_attr *ah_attr, struct cm_av *av) 452 { 453 cm_set_av_port(av, port); 454 av->pkey_index = wc->pkey_index; 455 rdma_move_ah_attr(&av->ah_attr, ah_attr); 456 } 457 458 static int cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 459 struct ib_grh *grh, struct cm_av *av) 460 { 461 cm_set_av_port(av, port); 462 av->pkey_index = wc->pkey_index; 463 return ib_init_ah_attr_from_wc(port->cm_dev->ib_device, 464 port->port_num, wc, 465 grh, &av->ah_attr); 466 } 467 468 static struct cm_port * 469 get_cm_port_from_path(struct sa_path_rec *path, const struct ib_gid_attr *attr) 470 { 471 struct cm_device *cm_dev; 472 struct cm_port *port = NULL; 473 unsigned long flags; 474 475 if (attr) { 476 read_lock_irqsave(&cm.device_lock, flags); 477 list_for_each_entry(cm_dev, &cm.device_list, list) { 478 if (cm_dev->ib_device == attr->device) { 479 port = cm_dev->port[attr->port_num - 1]; 480 break; 481 } 482 } 483 read_unlock_irqrestore(&cm.device_lock, flags); 484 } else { 485 /* SGID attribute can be NULL in following 486 * conditions. 487 * (a) Alternative path 488 * (b) IB link layer without GRH 489 * (c) LAP send messages 490 */ 491 read_lock_irqsave(&cm.device_lock, flags); 492 list_for_each_entry(cm_dev, &cm.device_list, list) { 493 attr = rdma_find_gid(cm_dev->ib_device, 494 &path->sgid, 495 sa_conv_pathrec_to_gid_type(path), 496 NULL); 497 if (!IS_ERR(attr)) { 498 port = cm_dev->port[attr->port_num - 1]; 499 break; 500 } 501 } 502 read_unlock_irqrestore(&cm.device_lock, flags); 503 if (port) 504 rdma_put_gid_attr(attr); 505 } 506 return port; 507 } 508 509 static int cm_init_av_by_path(struct sa_path_rec *path, 510 const struct ib_gid_attr *sgid_attr, 511 struct cm_av *av) 512 { 513 struct rdma_ah_attr new_ah_attr; 514 struct cm_device *cm_dev; 515 struct cm_port *port; 516 int ret; 517 518 port = get_cm_port_from_path(path, sgid_attr); 519 if (!port) 520 return -EINVAL; 521 cm_dev = port->cm_dev; 522 523 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num, 524 be16_to_cpu(path->pkey), &av->pkey_index); 525 if (ret) 526 return ret; 527 528 cm_set_av_port(av, port); 529 530 /* 531 * av->ah_attr might be initialized based on wc or during 532 * request processing time which might have reference to sgid_attr. 533 * So initialize a new ah_attr on stack. 534 * If initialization fails, old ah_attr is used for sending any 535 * responses. If initialization is successful, than new ah_attr 536 * is used by overwriting the old one. So that right ah_attr 537 * can be used to return an error response. 538 */ 539 ret = ib_init_ah_attr_from_path(cm_dev->ib_device, port->port_num, path, 540 &new_ah_attr, sgid_attr); 541 if (ret) 542 return ret; 543 544 av->timeout = path->packet_life_time + 1; 545 rdma_move_ah_attr(&av->ah_attr, &new_ah_attr); 546 return 0; 547 } 548 549 /* Move av created by cm_init_av_by_path(), so av.dgid is not moved */ 550 static void cm_move_av_from_path(struct cm_av *dest, struct cm_av *src) 551 { 552 cm_set_av_port(dest, src->port); 553 cm_set_av_port(src, NULL); 554 dest->pkey_index = src->pkey_index; 555 rdma_move_ah_attr(&dest->ah_attr, &src->ah_attr); 556 dest->timeout = src->timeout; 557 } 558 559 static void cm_destroy_av(struct cm_av *av) 560 { 561 rdma_destroy_ah_attr(&av->ah_attr); 562 cm_set_av_port(av, NULL); 563 } 564 565 static u32 cm_local_id(__be32 local_id) 566 { 567 return (__force u32) (local_id ^ cm.random_id_operand); 568 } 569 570 static struct cm_id_private *cm_acquire_id(__be32 local_id, __be32 remote_id) 571 { 572 struct cm_id_private *cm_id_priv; 573 574 rcu_read_lock(); 575 cm_id_priv = xa_load(&cm.local_id_table, cm_local_id(local_id)); 576 if (!cm_id_priv || cm_id_priv->id.remote_id != remote_id || 577 !refcount_inc_not_zero(&cm_id_priv->refcount)) 578 cm_id_priv = NULL; 579 rcu_read_unlock(); 580 581 return cm_id_priv; 582 } 583 584 /* 585 * Trivial helpers to strip endian annotation and compare; the 586 * endianness doesn't actually matter since we just need a stable 587 * order for the RB tree. 588 */ 589 static int be32_lt(__be32 a, __be32 b) 590 { 591 return (__force u32) a < (__force u32) b; 592 } 593 594 static int be32_gt(__be32 a, __be32 b) 595 { 596 return (__force u32) a > (__force u32) b; 597 } 598 599 static int be64_lt(__be64 a, __be64 b) 600 { 601 return (__force u64) a < (__force u64) b; 602 } 603 604 static int be64_gt(__be64 a, __be64 b) 605 { 606 return (__force u64) a > (__force u64) b; 607 } 608 609 /* 610 * Inserts a new cm_id_priv into the listen_service_table. Returns cm_id_priv 611 * if the new ID was inserted, NULL if it could not be inserted due to a 612 * collision, or the existing cm_id_priv ready for shared usage. 613 */ 614 static struct cm_id_private *cm_insert_listen(struct cm_id_private *cm_id_priv, 615 ib_cm_handler shared_handler) 616 { 617 struct rb_node **link = &cm.listen_service_table.rb_node; 618 struct rb_node *parent = NULL; 619 struct cm_id_private *cur_cm_id_priv; 620 __be64 service_id = cm_id_priv->id.service_id; 621 unsigned long flags; 622 623 spin_lock_irqsave(&cm.lock, flags); 624 while (*link) { 625 parent = *link; 626 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 627 service_node); 628 629 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 630 link = &(*link)->rb_left; 631 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 632 link = &(*link)->rb_right; 633 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id)) 634 link = &(*link)->rb_left; 635 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id)) 636 link = &(*link)->rb_right; 637 else { 638 /* 639 * Sharing an ib_cm_id with different handlers is not 640 * supported 641 */ 642 if (cur_cm_id_priv->id.cm_handler != shared_handler || 643 cur_cm_id_priv->id.context || 644 WARN_ON(!cur_cm_id_priv->id.cm_handler)) { 645 spin_unlock_irqrestore(&cm.lock, flags); 646 return NULL; 647 } 648 refcount_inc(&cur_cm_id_priv->refcount); 649 cur_cm_id_priv->listen_sharecount++; 650 spin_unlock_irqrestore(&cm.lock, flags); 651 return cur_cm_id_priv; 652 } 653 } 654 cm_id_priv->listen_sharecount++; 655 rb_link_node(&cm_id_priv->service_node, parent, link); 656 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 657 spin_unlock_irqrestore(&cm.lock, flags); 658 return cm_id_priv; 659 } 660 661 static struct cm_id_private *cm_find_listen(struct ib_device *device, 662 __be64 service_id) 663 { 664 struct rb_node *node = cm.listen_service_table.rb_node; 665 struct cm_id_private *cm_id_priv; 666 667 while (node) { 668 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 669 670 if (device < cm_id_priv->id.device) 671 node = node->rb_left; 672 else if (device > cm_id_priv->id.device) 673 node = node->rb_right; 674 else if (be64_lt(service_id, cm_id_priv->id.service_id)) 675 node = node->rb_left; 676 else if (be64_gt(service_id, cm_id_priv->id.service_id)) 677 node = node->rb_right; 678 else { 679 refcount_inc(&cm_id_priv->refcount); 680 return cm_id_priv; 681 } 682 } 683 return NULL; 684 } 685 686 static struct cm_timewait_info * 687 cm_insert_remote_id(struct cm_timewait_info *timewait_info) 688 { 689 struct rb_node **link = &cm.remote_id_table.rb_node; 690 struct rb_node *parent = NULL; 691 struct cm_timewait_info *cur_timewait_info; 692 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 693 __be32 remote_id = timewait_info->work.remote_id; 694 695 while (*link) { 696 parent = *link; 697 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 698 remote_id_node); 699 if (be32_lt(remote_id, cur_timewait_info->work.remote_id)) 700 link = &(*link)->rb_left; 701 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id)) 702 link = &(*link)->rb_right; 703 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 704 link = &(*link)->rb_left; 705 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 706 link = &(*link)->rb_right; 707 else 708 return cur_timewait_info; 709 } 710 timewait_info->inserted_remote_id = 1; 711 rb_link_node(&timewait_info->remote_id_node, parent, link); 712 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 713 return NULL; 714 } 715 716 static struct cm_id_private *cm_find_remote_id(__be64 remote_ca_guid, 717 __be32 remote_id) 718 { 719 struct rb_node *node = cm.remote_id_table.rb_node; 720 struct cm_timewait_info *timewait_info; 721 struct cm_id_private *res = NULL; 722 723 spin_lock_irq(&cm.lock); 724 while (node) { 725 timewait_info = rb_entry(node, struct cm_timewait_info, 726 remote_id_node); 727 if (be32_lt(remote_id, timewait_info->work.remote_id)) 728 node = node->rb_left; 729 else if (be32_gt(remote_id, timewait_info->work.remote_id)) 730 node = node->rb_right; 731 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid)) 732 node = node->rb_left; 733 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid)) 734 node = node->rb_right; 735 else { 736 res = cm_acquire_id(timewait_info->work.local_id, 737 timewait_info->work.remote_id); 738 break; 739 } 740 } 741 spin_unlock_irq(&cm.lock); 742 return res; 743 } 744 745 static struct cm_timewait_info * 746 cm_insert_remote_qpn(struct cm_timewait_info *timewait_info) 747 { 748 struct rb_node **link = &cm.remote_qp_table.rb_node; 749 struct rb_node *parent = NULL; 750 struct cm_timewait_info *cur_timewait_info; 751 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 752 __be32 remote_qpn = timewait_info->remote_qpn; 753 754 while (*link) { 755 parent = *link; 756 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 757 remote_qp_node); 758 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn)) 759 link = &(*link)->rb_left; 760 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn)) 761 link = &(*link)->rb_right; 762 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 763 link = &(*link)->rb_left; 764 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 765 link = &(*link)->rb_right; 766 else 767 return cur_timewait_info; 768 } 769 timewait_info->inserted_remote_qp = 1; 770 rb_link_node(&timewait_info->remote_qp_node, parent, link); 771 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 772 return NULL; 773 } 774 775 static struct cm_id_private * 776 cm_insert_remote_sidr(struct cm_id_private *cm_id_priv) 777 { 778 struct rb_node **link = &cm.remote_sidr_table.rb_node; 779 struct rb_node *parent = NULL; 780 struct cm_id_private *cur_cm_id_priv; 781 __be32 remote_id = cm_id_priv->id.remote_id; 782 783 while (*link) { 784 parent = *link; 785 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 786 sidr_id_node); 787 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id)) 788 link = &(*link)->rb_left; 789 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id)) 790 link = &(*link)->rb_right; 791 else { 792 if (cur_cm_id_priv->sidr_slid < cm_id_priv->sidr_slid) 793 link = &(*link)->rb_left; 794 else if (cur_cm_id_priv->sidr_slid > cm_id_priv->sidr_slid) 795 link = &(*link)->rb_right; 796 else 797 return cur_cm_id_priv; 798 } 799 } 800 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 801 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 802 return NULL; 803 } 804 805 static struct cm_id_private *cm_alloc_id_priv(struct ib_device *device, 806 ib_cm_handler cm_handler, 807 void *context) 808 { 809 struct cm_id_private *cm_id_priv; 810 u32 id; 811 int ret; 812 813 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 814 if (!cm_id_priv) 815 return ERR_PTR(-ENOMEM); 816 817 cm_id_priv->id.state = IB_CM_IDLE; 818 cm_id_priv->id.device = device; 819 cm_id_priv->id.cm_handler = cm_handler; 820 cm_id_priv->id.context = context; 821 cm_id_priv->id.remote_cm_qpn = 1; 822 823 RB_CLEAR_NODE(&cm_id_priv->service_node); 824 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); 825 spin_lock_init(&cm_id_priv->lock); 826 init_completion(&cm_id_priv->comp); 827 INIT_LIST_HEAD(&cm_id_priv->work_list); 828 atomic_set(&cm_id_priv->work_count, -1); 829 refcount_set(&cm_id_priv->refcount, 1); 830 831 ret = xa_alloc_cyclic(&cm.local_id_table, &id, NULL, xa_limit_32b, 832 &cm.local_id_next, GFP_KERNEL); 833 if (ret < 0) 834 goto error; 835 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand; 836 837 return cm_id_priv; 838 839 error: 840 kfree(cm_id_priv); 841 return ERR_PTR(ret); 842 } 843 844 /* 845 * Make the ID visible to the MAD handlers and other threads that use the 846 * xarray. 847 */ 848 static void cm_finalize_id(struct cm_id_private *cm_id_priv) 849 { 850 xa_store(&cm.local_id_table, cm_local_id(cm_id_priv->id.local_id), 851 cm_id_priv, GFP_ATOMIC); 852 } 853 854 struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 855 ib_cm_handler cm_handler, 856 void *context) 857 { 858 struct cm_id_private *cm_id_priv; 859 860 cm_id_priv = cm_alloc_id_priv(device, cm_handler, context); 861 if (IS_ERR(cm_id_priv)) 862 return ERR_CAST(cm_id_priv); 863 864 cm_finalize_id(cm_id_priv); 865 return &cm_id_priv->id; 866 } 867 EXPORT_SYMBOL(ib_create_cm_id); 868 869 static struct cm_work *cm_dequeue_work(struct cm_id_private *cm_id_priv) 870 { 871 struct cm_work *work; 872 873 if (list_empty(&cm_id_priv->work_list)) 874 return NULL; 875 876 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 877 list_del(&work->list); 878 return work; 879 } 880 881 static void cm_free_work(struct cm_work *work) 882 { 883 if (work->mad_recv_wc) 884 ib_free_recv_mad(work->mad_recv_wc); 885 kfree(work); 886 } 887 888 static void cm_queue_work_unlock(struct cm_id_private *cm_id_priv, 889 struct cm_work *work) 890 __releases(&cm_id_priv->lock) 891 { 892 bool immediate; 893 894 /* 895 * To deliver the event to the user callback we have the drop the 896 * spinlock, however, we need to ensure that the user callback is single 897 * threaded and receives events in the temporal order. If there are 898 * already events being processed then thread new events onto a list, 899 * the thread currently processing will pick them up. 900 */ 901 immediate = atomic_inc_and_test(&cm_id_priv->work_count); 902 if (!immediate) { 903 list_add_tail(&work->list, &cm_id_priv->work_list); 904 /* 905 * This routine always consumes incoming reference. Once queued 906 * to the work_list then a reference is held by the thread 907 * currently running cm_process_work() and this reference is not 908 * needed. 909 */ 910 cm_deref_id(cm_id_priv); 911 } 912 spin_unlock_irq(&cm_id_priv->lock); 913 914 if (immediate) 915 cm_process_work(cm_id_priv, work); 916 } 917 918 static inline int cm_convert_to_ms(int iba_time) 919 { 920 /* approximate conversion to ms from 4.096us x 2^iba_time */ 921 return 1 << max(iba_time - 8, 0); 922 } 923 924 /* 925 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 926 * Because of how ack_timeout is stored, adding one doubles the timeout. 927 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 928 * increment it (round up) only if the other is within 50%. 929 */ 930 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 931 { 932 int ack_timeout = packet_life_time + 1; 933 934 if (ack_timeout >= ca_ack_delay) 935 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 936 else 937 ack_timeout = ca_ack_delay + 938 (ack_timeout >= (ca_ack_delay - 1)); 939 940 return min(31, ack_timeout); 941 } 942 943 static void cm_remove_remote(struct cm_id_private *cm_id_priv) 944 { 945 struct cm_timewait_info *timewait_info = cm_id_priv->timewait_info; 946 947 if (timewait_info->inserted_remote_id) { 948 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 949 timewait_info->inserted_remote_id = 0; 950 } 951 952 if (timewait_info->inserted_remote_qp) { 953 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 954 timewait_info->inserted_remote_qp = 0; 955 } 956 } 957 958 static struct cm_timewait_info *cm_create_timewait_info(__be32 local_id) 959 { 960 struct cm_timewait_info *timewait_info; 961 962 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 963 if (!timewait_info) 964 return ERR_PTR(-ENOMEM); 965 966 timewait_info->work.local_id = local_id; 967 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 968 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 969 return timewait_info; 970 } 971 972 static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 973 { 974 int wait_time; 975 unsigned long flags; 976 struct cm_device *cm_dev; 977 978 lockdep_assert_held(&cm_id_priv->lock); 979 980 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client); 981 if (!cm_dev) 982 return; 983 984 spin_lock_irqsave(&cm.lock, flags); 985 cm_remove_remote(cm_id_priv); 986 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 987 spin_unlock_irqrestore(&cm.lock, flags); 988 989 /* 990 * The cm_id could be destroyed by the user before we exit timewait. 991 * To protect against this, we search for the cm_id after exiting 992 * timewait before notifying the user that we've exited timewait. 993 */ 994 cm_id_priv->id.state = IB_CM_TIMEWAIT; 995 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 996 997 /* Check if the device started its remove_one */ 998 spin_lock_irqsave(&cm.lock, flags); 999 if (!cm_dev->going_down) 1000 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 1001 msecs_to_jiffies(wait_time)); 1002 spin_unlock_irqrestore(&cm.lock, flags); 1003 1004 /* 1005 * The timewait_info is converted into a work and gets freed during 1006 * cm_free_work() in cm_timewait_handler(). 1007 */ 1008 BUILD_BUG_ON(offsetof(struct cm_timewait_info, work) != 0); 1009 cm_id_priv->timewait_info = NULL; 1010 } 1011 1012 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 1013 { 1014 unsigned long flags; 1015 1016 lockdep_assert_held(&cm_id_priv->lock); 1017 1018 cm_id_priv->id.state = IB_CM_IDLE; 1019 if (cm_id_priv->timewait_info) { 1020 spin_lock_irqsave(&cm.lock, flags); 1021 cm_remove_remote(cm_id_priv); 1022 spin_unlock_irqrestore(&cm.lock, flags); 1023 kfree(cm_id_priv->timewait_info); 1024 cm_id_priv->timewait_info = NULL; 1025 } 1026 } 1027 1028 static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 1029 { 1030 struct cm_id_private *cm_id_priv; 1031 struct cm_work *work; 1032 1033 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1034 spin_lock_irq(&cm_id_priv->lock); 1035 retest: 1036 switch (cm_id->state) { 1037 case IB_CM_LISTEN: 1038 spin_lock(&cm.lock); 1039 if (--cm_id_priv->listen_sharecount > 0) { 1040 /* The id is still shared. */ 1041 WARN_ON(refcount_read(&cm_id_priv->refcount) == 1); 1042 spin_unlock(&cm.lock); 1043 spin_unlock_irq(&cm_id_priv->lock); 1044 cm_deref_id(cm_id_priv); 1045 return; 1046 } 1047 cm_id->state = IB_CM_IDLE; 1048 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 1049 RB_CLEAR_NODE(&cm_id_priv->service_node); 1050 spin_unlock(&cm.lock); 1051 break; 1052 case IB_CM_SIDR_REQ_SENT: 1053 cm_id->state = IB_CM_IDLE; 1054 ib_cancel_mad(cm_id_priv->msg); 1055 break; 1056 case IB_CM_SIDR_REQ_RCVD: 1057 cm_send_sidr_rep_locked(cm_id_priv, 1058 &(struct ib_cm_sidr_rep_param){ 1059 .status = IB_SIDR_REJECT }); 1060 /* cm_send_sidr_rep_locked will not move to IDLE if it fails */ 1061 cm_id->state = IB_CM_IDLE; 1062 break; 1063 case IB_CM_REQ_SENT: 1064 case IB_CM_MRA_REQ_RCVD: 1065 ib_cancel_mad(cm_id_priv->msg); 1066 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_TIMEOUT, 1067 &cm_id_priv->id.device->node_guid, 1068 sizeof(cm_id_priv->id.device->node_guid), 1069 NULL, 0); 1070 break; 1071 case IB_CM_REQ_RCVD: 1072 if (err == -ENOMEM) { 1073 /* Do not reject to allow future retries. */ 1074 cm_reset_to_idle(cm_id_priv); 1075 } else { 1076 cm_send_rej_locked(cm_id_priv, 1077 IB_CM_REJ_CONSUMER_DEFINED, NULL, 0, 1078 NULL, 0); 1079 } 1080 break; 1081 case IB_CM_REP_SENT: 1082 case IB_CM_MRA_REP_RCVD: 1083 ib_cancel_mad(cm_id_priv->msg); 1084 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL, 1085 0, NULL, 0); 1086 goto retest; 1087 case IB_CM_MRA_REQ_SENT: 1088 case IB_CM_REP_RCVD: 1089 case IB_CM_MRA_REP_SENT: 1090 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL, 1091 0, NULL, 0); 1092 break; 1093 case IB_CM_ESTABLISHED: 1094 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 1095 cm_id->state = IB_CM_IDLE; 1096 break; 1097 } 1098 cm_send_dreq_locked(cm_id_priv, NULL, 0); 1099 goto retest; 1100 case IB_CM_DREQ_SENT: 1101 ib_cancel_mad(cm_id_priv->msg); 1102 cm_enter_timewait(cm_id_priv); 1103 goto retest; 1104 case IB_CM_DREQ_RCVD: 1105 cm_send_drep_locked(cm_id_priv, NULL, 0); 1106 WARN_ON(cm_id->state != IB_CM_TIMEWAIT); 1107 goto retest; 1108 case IB_CM_TIMEWAIT: 1109 /* 1110 * The cm_acquire_id in cm_timewait_handler will stop working 1111 * once we do xa_erase below, so just move to idle here for 1112 * consistency. 1113 */ 1114 cm_id->state = IB_CM_IDLE; 1115 break; 1116 case IB_CM_IDLE: 1117 break; 1118 } 1119 WARN_ON(cm_id->state != IB_CM_IDLE); 1120 1121 spin_lock(&cm.lock); 1122 /* Required for cleanup paths related cm_req_handler() */ 1123 if (cm_id_priv->timewait_info) { 1124 cm_remove_remote(cm_id_priv); 1125 kfree(cm_id_priv->timewait_info); 1126 cm_id_priv->timewait_info = NULL; 1127 } 1128 1129 WARN_ON(cm_id_priv->listen_sharecount); 1130 WARN_ON(!RB_EMPTY_NODE(&cm_id_priv->service_node)); 1131 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) 1132 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 1133 spin_unlock(&cm.lock); 1134 spin_unlock_irq(&cm_id_priv->lock); 1135 1136 xa_erase(&cm.local_id_table, cm_local_id(cm_id->local_id)); 1137 cm_deref_id(cm_id_priv); 1138 wait_for_completion(&cm_id_priv->comp); 1139 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 1140 cm_free_work(work); 1141 1142 cm_destroy_av(&cm_id_priv->av); 1143 cm_destroy_av(&cm_id_priv->alt_av); 1144 kfree(cm_id_priv->private_data); 1145 kfree_rcu(cm_id_priv, rcu); 1146 } 1147 1148 void ib_destroy_cm_id(struct ib_cm_id *cm_id) 1149 { 1150 cm_destroy_id(cm_id, 0); 1151 } 1152 EXPORT_SYMBOL(ib_destroy_cm_id); 1153 1154 static int cm_init_listen(struct cm_id_private *cm_id_priv, __be64 service_id) 1155 { 1156 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 1157 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 1158 return -EINVAL; 1159 1160 if (service_id == IB_CM_ASSIGN_SERVICE_ID) 1161 cm_id_priv->id.service_id = cpu_to_be64(cm.listen_service_id++); 1162 else 1163 cm_id_priv->id.service_id = service_id; 1164 1165 return 0; 1166 } 1167 1168 /** 1169 * ib_cm_listen - Initiates listening on the specified service ID for 1170 * connection and service ID resolution requests. 1171 * @cm_id: Connection identifier associated with the listen request. 1172 * @service_id: Service identifier matched against incoming connection 1173 * and service ID resolution requests. The service ID should be specified 1174 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1175 * assign a service ID to the caller. 1176 */ 1177 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id) 1178 { 1179 struct cm_id_private *cm_id_priv = 1180 container_of(cm_id, struct cm_id_private, id); 1181 unsigned long flags; 1182 int ret; 1183 1184 spin_lock_irqsave(&cm_id_priv->lock, flags); 1185 if (cm_id_priv->id.state != IB_CM_IDLE) { 1186 ret = -EINVAL; 1187 goto out; 1188 } 1189 1190 ret = cm_init_listen(cm_id_priv, service_id); 1191 if (ret) 1192 goto out; 1193 1194 if (!cm_insert_listen(cm_id_priv, NULL)) { 1195 ret = -EBUSY; 1196 goto out; 1197 } 1198 1199 cm_id_priv->id.state = IB_CM_LISTEN; 1200 ret = 0; 1201 1202 out: 1203 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1204 return ret; 1205 } 1206 EXPORT_SYMBOL(ib_cm_listen); 1207 1208 /** 1209 * ib_cm_insert_listen - Create a new listening ib_cm_id and listen on 1210 * the given service ID. 1211 * 1212 * If there's an existing ID listening on that same device and service ID, 1213 * return it. 1214 * 1215 * @device: Device associated with the cm_id. All related communication will 1216 * be associated with the specified device. 1217 * @cm_handler: Callback invoked to notify the user of CM events. 1218 * @service_id: Service identifier matched against incoming connection 1219 * and service ID resolution requests. The service ID should be specified 1220 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1221 * assign a service ID to the caller. 1222 * 1223 * Callers should call ib_destroy_cm_id when done with the listener ID. 1224 */ 1225 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device, 1226 ib_cm_handler cm_handler, 1227 __be64 service_id) 1228 { 1229 struct cm_id_private *listen_id_priv; 1230 struct cm_id_private *cm_id_priv; 1231 int err = 0; 1232 1233 /* Create an ID in advance, since the creation may sleep */ 1234 cm_id_priv = cm_alloc_id_priv(device, cm_handler, NULL); 1235 if (IS_ERR(cm_id_priv)) 1236 return ERR_CAST(cm_id_priv); 1237 1238 err = cm_init_listen(cm_id_priv, service_id); 1239 if (err) { 1240 ib_destroy_cm_id(&cm_id_priv->id); 1241 return ERR_PTR(err); 1242 } 1243 1244 spin_lock_irq(&cm_id_priv->lock); 1245 listen_id_priv = cm_insert_listen(cm_id_priv, cm_handler); 1246 if (listen_id_priv != cm_id_priv) { 1247 spin_unlock_irq(&cm_id_priv->lock); 1248 ib_destroy_cm_id(&cm_id_priv->id); 1249 if (!listen_id_priv) 1250 return ERR_PTR(-EINVAL); 1251 return &listen_id_priv->id; 1252 } 1253 cm_id_priv->id.state = IB_CM_LISTEN; 1254 spin_unlock_irq(&cm_id_priv->lock); 1255 1256 /* 1257 * A listen ID does not need to be in the xarray since it does not 1258 * receive mads, is not placed in the remote_id or remote_qpn rbtree, 1259 * and does not enter timewait. 1260 */ 1261 1262 return &cm_id_priv->id; 1263 } 1264 EXPORT_SYMBOL(ib_cm_insert_listen); 1265 1266 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv) 1267 { 1268 u64 hi_tid = 0, low_tid; 1269 1270 lockdep_assert_held(&cm_id_priv->lock); 1271 1272 low_tid = (u64)cm_id_priv->id.local_id; 1273 if (!cm_id_priv->av.port) 1274 return cpu_to_be64(low_tid); 1275 1276 spin_lock(&cm_id_priv->av.port->cm_dev->mad_agent_lock); 1277 if (cm_id_priv->av.port->mad_agent) 1278 hi_tid = ((u64)cm_id_priv->av.port->mad_agent->hi_tid) << 32; 1279 spin_unlock(&cm_id_priv->av.port->cm_dev->mad_agent_lock); 1280 return cpu_to_be64(hi_tid | low_tid); 1281 } 1282 1283 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 1284 __be16 attr_id, __be64 tid) 1285 { 1286 hdr->base_version = IB_MGMT_BASE_VERSION; 1287 hdr->mgmt_class = IB_MGMT_CLASS_CM; 1288 hdr->class_version = IB_CM_CLASS_VERSION; 1289 hdr->method = IB_MGMT_METHOD_SEND; 1290 hdr->attr_id = attr_id; 1291 hdr->tid = tid; 1292 } 1293 1294 static void cm_format_mad_ece_hdr(struct ib_mad_hdr *hdr, __be16 attr_id, 1295 __be64 tid, u32 attr_mod) 1296 { 1297 cm_format_mad_hdr(hdr, attr_id, tid); 1298 hdr->attr_mod = cpu_to_be32(attr_mod); 1299 } 1300 1301 static void cm_format_req(struct cm_req_msg *req_msg, 1302 struct cm_id_private *cm_id_priv, 1303 struct ib_cm_req_param *param) 1304 { 1305 struct sa_path_rec *pri_path = param->primary_path; 1306 struct sa_path_rec *alt_path = param->alternate_path; 1307 bool pri_ext = false; 1308 __be16 lid; 1309 1310 if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA) 1311 pri_ext = opa_is_extended_lid(pri_path->opa.dlid, 1312 pri_path->opa.slid); 1313 1314 cm_format_mad_ece_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1315 cm_form_tid(cm_id_priv), param->ece.attr_mod); 1316 1317 IBA_SET(CM_REQ_LOCAL_COMM_ID, req_msg, 1318 be32_to_cpu(cm_id_priv->id.local_id)); 1319 IBA_SET(CM_REQ_SERVICE_ID, req_msg, be64_to_cpu(param->service_id)); 1320 IBA_SET(CM_REQ_LOCAL_CA_GUID, req_msg, 1321 be64_to_cpu(cm_id_priv->id.device->node_guid)); 1322 IBA_SET(CM_REQ_LOCAL_QPN, req_msg, param->qp_num); 1323 IBA_SET(CM_REQ_INITIATOR_DEPTH, req_msg, param->initiator_depth); 1324 IBA_SET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg, 1325 param->remote_cm_response_timeout); 1326 cm_req_set_qp_type(req_msg, param->qp_type); 1327 IBA_SET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg, param->flow_control); 1328 IBA_SET(CM_REQ_STARTING_PSN, req_msg, param->starting_psn); 1329 IBA_SET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg, 1330 param->local_cm_response_timeout); 1331 IBA_SET(CM_REQ_PARTITION_KEY, req_msg, 1332 be16_to_cpu(param->primary_path->pkey)); 1333 IBA_SET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg, 1334 param->primary_path->mtu); 1335 IBA_SET(CM_REQ_MAX_CM_RETRIES, req_msg, param->max_cm_retries); 1336 1337 if (param->qp_type != IB_QPT_XRC_INI) { 1338 IBA_SET(CM_REQ_RESPONDER_RESOURCES, req_msg, 1339 param->responder_resources); 1340 IBA_SET(CM_REQ_RETRY_COUNT, req_msg, param->retry_count); 1341 IBA_SET(CM_REQ_RNR_RETRY_COUNT, req_msg, 1342 param->rnr_retry_count); 1343 IBA_SET(CM_REQ_SRQ, req_msg, param->srq); 1344 } 1345 1346 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) = 1347 pri_path->sgid; 1348 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) = 1349 pri_path->dgid; 1350 if (pri_ext) { 1351 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) 1352 ->global.interface_id = 1353 OPA_MAKE_ID(be32_to_cpu(pri_path->opa.slid)); 1354 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) 1355 ->global.interface_id = 1356 OPA_MAKE_ID(be32_to_cpu(pri_path->opa.dlid)); 1357 } 1358 if (pri_path->hop_limit <= 1) { 1359 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 1360 be16_to_cpu(pri_ext ? 0 : 1361 htons(ntohl(sa_path_get_slid( 1362 pri_path))))); 1363 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, 1364 be16_to_cpu(pri_ext ? 0 : 1365 htons(ntohl(sa_path_get_dlid( 1366 pri_path))))); 1367 } else { 1368 1369 if (param->primary_path_inbound) { 1370 lid = param->primary_path_inbound->ib.dlid; 1371 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 1372 be16_to_cpu(lid)); 1373 } else 1374 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 1375 be16_to_cpu(IB_LID_PERMISSIVE)); 1376 1377 /* Work-around until there's a way to obtain remote LID info */ 1378 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, 1379 be16_to_cpu(IB_LID_PERMISSIVE)); 1380 } 1381 IBA_SET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg, 1382 be32_to_cpu(pri_path->flow_label)); 1383 IBA_SET(CM_REQ_PRIMARY_PACKET_RATE, req_msg, pri_path->rate); 1384 IBA_SET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg, pri_path->traffic_class); 1385 IBA_SET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg, pri_path->hop_limit); 1386 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, pri_path->sl); 1387 IBA_SET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg, 1388 (pri_path->hop_limit <= 1)); 1389 IBA_SET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg, 1390 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1391 pri_path->packet_life_time)); 1392 1393 if (alt_path) { 1394 bool alt_ext = false; 1395 1396 if (alt_path->rec_type == SA_PATH_REC_TYPE_OPA) 1397 alt_ext = opa_is_extended_lid(alt_path->opa.dlid, 1398 alt_path->opa.slid); 1399 1400 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg) = 1401 alt_path->sgid; 1402 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg) = 1403 alt_path->dgid; 1404 if (alt_ext) { 1405 IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, 1406 req_msg) 1407 ->global.interface_id = 1408 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.slid)); 1409 IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, 1410 req_msg) 1411 ->global.interface_id = 1412 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.dlid)); 1413 } 1414 if (alt_path->hop_limit <= 1) { 1415 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, 1416 be16_to_cpu( 1417 alt_ext ? 0 : 1418 htons(ntohl(sa_path_get_slid( 1419 alt_path))))); 1420 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, 1421 be16_to_cpu( 1422 alt_ext ? 0 : 1423 htons(ntohl(sa_path_get_dlid( 1424 alt_path))))); 1425 } else { 1426 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, 1427 be16_to_cpu(IB_LID_PERMISSIVE)); 1428 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, 1429 be16_to_cpu(IB_LID_PERMISSIVE)); 1430 } 1431 IBA_SET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg, 1432 be32_to_cpu(alt_path->flow_label)); 1433 IBA_SET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg, alt_path->rate); 1434 IBA_SET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg, 1435 alt_path->traffic_class); 1436 IBA_SET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg, 1437 alt_path->hop_limit); 1438 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, alt_path->sl); 1439 IBA_SET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg, 1440 (alt_path->hop_limit <= 1)); 1441 IBA_SET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg, 1442 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1443 alt_path->packet_life_time)); 1444 } 1445 IBA_SET(CM_REQ_VENDOR_ID, req_msg, param->ece.vendor_id); 1446 1447 if (param->private_data && param->private_data_len) 1448 IBA_SET_MEM(CM_REQ_PRIVATE_DATA, req_msg, param->private_data, 1449 param->private_data_len); 1450 } 1451 1452 static int cm_validate_req_param(struct ib_cm_req_param *param) 1453 { 1454 if (!param->primary_path) 1455 return -EINVAL; 1456 1457 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC && 1458 param->qp_type != IB_QPT_XRC_INI) 1459 return -EINVAL; 1460 1461 if (param->private_data && 1462 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1463 return -EINVAL; 1464 1465 if (param->alternate_path && 1466 (param->alternate_path->pkey != param->primary_path->pkey || 1467 param->alternate_path->mtu != param->primary_path->mtu)) 1468 return -EINVAL; 1469 1470 return 0; 1471 } 1472 1473 int ib_send_cm_req(struct ib_cm_id *cm_id, 1474 struct ib_cm_req_param *param) 1475 { 1476 struct cm_av av = {}, alt_av = {}; 1477 struct cm_id_private *cm_id_priv; 1478 struct ib_mad_send_buf *msg; 1479 struct cm_req_msg *req_msg; 1480 unsigned long flags; 1481 int ret; 1482 1483 ret = cm_validate_req_param(param); 1484 if (ret) 1485 return ret; 1486 1487 /* Verify that we're not in timewait. */ 1488 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1489 spin_lock_irqsave(&cm_id_priv->lock, flags); 1490 if (cm_id->state != IB_CM_IDLE || WARN_ON(cm_id_priv->timewait_info)) { 1491 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1492 return -EINVAL; 1493 } 1494 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1495 1496 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1497 id.local_id); 1498 if (IS_ERR(cm_id_priv->timewait_info)) { 1499 ret = PTR_ERR(cm_id_priv->timewait_info); 1500 cm_id_priv->timewait_info = NULL; 1501 return ret; 1502 } 1503 1504 ret = cm_init_av_by_path(param->primary_path, 1505 param->ppath_sgid_attr, &av); 1506 if (ret) 1507 return ret; 1508 if (param->alternate_path) { 1509 ret = cm_init_av_by_path(param->alternate_path, NULL, 1510 &alt_av); 1511 if (ret) { 1512 cm_destroy_av(&av); 1513 return ret; 1514 } 1515 } 1516 cm_id->service_id = param->service_id; 1517 cm_id_priv->timeout_ms = cm_convert_to_ms( 1518 param->primary_path->packet_life_time) * 2 + 1519 cm_convert_to_ms( 1520 param->remote_cm_response_timeout); 1521 cm_id_priv->max_cm_retries = param->max_cm_retries; 1522 cm_id_priv->initiator_depth = param->initiator_depth; 1523 cm_id_priv->responder_resources = param->responder_resources; 1524 cm_id_priv->retry_count = param->retry_count; 1525 cm_id_priv->path_mtu = param->primary_path->mtu; 1526 cm_id_priv->pkey = param->primary_path->pkey; 1527 cm_id_priv->qp_type = param->qp_type; 1528 1529 spin_lock_irqsave(&cm_id_priv->lock, flags); 1530 1531 cm_move_av_from_path(&cm_id_priv->av, &av); 1532 if (param->primary_path_outbound) 1533 cm_id_priv->av.dlid_datapath = 1534 be16_to_cpu(param->primary_path_outbound->ib.dlid); 1535 1536 if (param->alternate_path) 1537 cm_move_av_from_path(&cm_id_priv->alt_av, &alt_av); 1538 1539 msg = cm_alloc_priv_msg(cm_id_priv); 1540 if (IS_ERR(msg)) { 1541 ret = PTR_ERR(msg); 1542 goto out_unlock; 1543 } 1544 1545 req_msg = (struct cm_req_msg *)msg->mad; 1546 cm_format_req(req_msg, cm_id_priv, param); 1547 cm_id_priv->tid = req_msg->hdr.tid; 1548 msg->timeout_ms = cm_id_priv->timeout_ms; 1549 msg->context[1] = (void *)(unsigned long)IB_CM_REQ_SENT; 1550 1551 cm_id_priv->local_qpn = cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg)); 1552 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg)); 1553 1554 trace_icm_send_req(&cm_id_priv->id); 1555 ret = ib_post_send_mad(msg, NULL); 1556 if (ret) 1557 goto out_free; 1558 BUG_ON(cm_id->state != IB_CM_IDLE); 1559 cm_id->state = IB_CM_REQ_SENT; 1560 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1561 return 0; 1562 out_free: 1563 cm_free_priv_msg(msg); 1564 out_unlock: 1565 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1566 return ret; 1567 } 1568 EXPORT_SYMBOL(ib_send_cm_req); 1569 1570 static int cm_issue_rej(struct cm_port *port, 1571 struct ib_mad_recv_wc *mad_recv_wc, 1572 enum ib_cm_rej_reason reason, 1573 enum cm_msg_response msg_rejected, 1574 void *ari, u8 ari_length) 1575 { 1576 struct ib_mad_send_buf *msg = NULL; 1577 struct cm_rej_msg *rej_msg, *rcv_msg; 1578 int ret; 1579 1580 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1581 if (ret) 1582 return ret; 1583 1584 /* We just need common CM header information. Cast to any message. */ 1585 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1586 rej_msg = (struct cm_rej_msg *) msg->mad; 1587 1588 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1589 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg, 1590 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg)); 1591 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1592 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg)); 1593 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, msg_rejected); 1594 IBA_SET(CM_REJ_REASON, rej_msg, reason); 1595 1596 if (ari && ari_length) { 1597 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length); 1598 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length); 1599 } 1600 1601 trace_icm_issue_rej( 1602 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg), 1603 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg)); 1604 ret = ib_post_send_mad(msg, NULL); 1605 if (ret) 1606 cm_free_response_msg(msg); 1607 1608 return ret; 1609 } 1610 1611 static bool cm_req_has_alt_path(struct cm_req_msg *req_msg) 1612 { 1613 return ((cpu_to_be16( 1614 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg))) || 1615 (ib_is_opa_gid(IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, 1616 req_msg)))); 1617 } 1618 1619 static void cm_path_set_rec_type(struct ib_device *ib_device, u32 port_num, 1620 struct sa_path_rec *path, union ib_gid *gid) 1621 { 1622 if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num)) 1623 path->rec_type = SA_PATH_REC_TYPE_OPA; 1624 else 1625 path->rec_type = SA_PATH_REC_TYPE_IB; 1626 } 1627 1628 static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg, 1629 struct sa_path_rec *primary_path, 1630 struct sa_path_rec *alt_path, 1631 struct ib_wc *wc) 1632 { 1633 u32 lid; 1634 1635 if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) { 1636 sa_path_set_dlid(primary_path, wc->slid); 1637 sa_path_set_slid(primary_path, 1638 IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID, 1639 req_msg)); 1640 } else { 1641 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1642 CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg)); 1643 sa_path_set_dlid(primary_path, lid); 1644 1645 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1646 CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg)); 1647 sa_path_set_slid(primary_path, lid); 1648 } 1649 1650 if (!cm_req_has_alt_path(req_msg)) 1651 return; 1652 1653 if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) { 1654 sa_path_set_dlid(alt_path, 1655 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, 1656 req_msg)); 1657 sa_path_set_slid(alt_path, 1658 IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, 1659 req_msg)); 1660 } else { 1661 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1662 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg)); 1663 sa_path_set_dlid(alt_path, lid); 1664 1665 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1666 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg)); 1667 sa_path_set_slid(alt_path, lid); 1668 } 1669 } 1670 1671 static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1672 struct sa_path_rec *primary_path, 1673 struct sa_path_rec *alt_path, 1674 struct ib_wc *wc) 1675 { 1676 primary_path->dgid = 1677 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg); 1678 primary_path->sgid = 1679 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg); 1680 primary_path->flow_label = 1681 cpu_to_be32(IBA_GET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg)); 1682 primary_path->hop_limit = IBA_GET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg); 1683 primary_path->traffic_class = 1684 IBA_GET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg); 1685 primary_path->reversible = 1; 1686 primary_path->pkey = 1687 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 1688 primary_path->sl = IBA_GET(CM_REQ_PRIMARY_SL, req_msg); 1689 primary_path->mtu_selector = IB_SA_EQ; 1690 primary_path->mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 1691 primary_path->rate_selector = IB_SA_EQ; 1692 primary_path->rate = IBA_GET(CM_REQ_PRIMARY_PACKET_RATE, req_msg); 1693 primary_path->packet_life_time_selector = IB_SA_EQ; 1694 primary_path->packet_life_time = 1695 IBA_GET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg); 1696 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1697 primary_path->service_id = 1698 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 1699 if (sa_path_is_roce(primary_path)) 1700 primary_path->roce.route_resolved = false; 1701 1702 if (cm_req_has_alt_path(req_msg)) { 1703 alt_path->dgid = *IBA_GET_MEM_PTR( 1704 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg); 1705 alt_path->sgid = *IBA_GET_MEM_PTR( 1706 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg); 1707 alt_path->flow_label = cpu_to_be32( 1708 IBA_GET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg)); 1709 alt_path->hop_limit = 1710 IBA_GET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg); 1711 alt_path->traffic_class = 1712 IBA_GET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg); 1713 alt_path->reversible = 1; 1714 alt_path->pkey = 1715 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 1716 alt_path->sl = IBA_GET(CM_REQ_ALTERNATE_SL, req_msg); 1717 alt_path->mtu_selector = IB_SA_EQ; 1718 alt_path->mtu = 1719 IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 1720 alt_path->rate_selector = IB_SA_EQ; 1721 alt_path->rate = IBA_GET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg); 1722 alt_path->packet_life_time_selector = IB_SA_EQ; 1723 alt_path->packet_life_time = 1724 IBA_GET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg); 1725 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1726 alt_path->service_id = 1727 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 1728 1729 if (sa_path_is_roce(alt_path)) 1730 alt_path->roce.route_resolved = false; 1731 } 1732 cm_format_path_lid_from_req(req_msg, primary_path, alt_path, wc); 1733 } 1734 1735 static u16 cm_get_bth_pkey(struct cm_work *work) 1736 { 1737 struct ib_device *ib_dev = work->port->cm_dev->ib_device; 1738 u32 port_num = work->port->port_num; 1739 u16 pkey_index = work->mad_recv_wc->wc->pkey_index; 1740 u16 pkey; 1741 int ret; 1742 1743 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey); 1744 if (ret) { 1745 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %u, pkey index %u). %d\n", 1746 port_num, pkey_index, ret); 1747 return 0; 1748 } 1749 1750 return pkey; 1751 } 1752 1753 /** 1754 * cm_opa_to_ib_sgid - Convert OPA SGID to IB SGID 1755 * ULPs (such as IPoIB) do not understand OPA GIDs and will 1756 * reject them as the local_gid will not match the sgid. Therefore, 1757 * change the pathrec's SGID to an IB SGID. 1758 * 1759 * @work: Work completion 1760 * @path: Path record 1761 */ 1762 static void cm_opa_to_ib_sgid(struct cm_work *work, 1763 struct sa_path_rec *path) 1764 { 1765 struct ib_device *dev = work->port->cm_dev->ib_device; 1766 u32 port_num = work->port->port_num; 1767 1768 if (rdma_cap_opa_ah(dev, port_num) && 1769 (ib_is_opa_gid(&path->sgid))) { 1770 union ib_gid sgid; 1771 1772 if (rdma_query_gid(dev, port_num, 0, &sgid)) { 1773 dev_warn(&dev->dev, 1774 "Error updating sgid in CM request\n"); 1775 return; 1776 } 1777 1778 path->sgid = sgid; 1779 } 1780 } 1781 1782 static void cm_format_req_event(struct cm_work *work, 1783 struct cm_id_private *cm_id_priv, 1784 struct ib_cm_id *listen_id) 1785 { 1786 struct cm_req_msg *req_msg; 1787 struct ib_cm_req_event_param *param; 1788 1789 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1790 param = &work->cm_event.param.req_rcvd; 1791 param->listen_id = listen_id; 1792 param->bth_pkey = cm_get_bth_pkey(work); 1793 param->port = cm_id_priv->av.port->port_num; 1794 param->primary_path = &work->path[0]; 1795 cm_opa_to_ib_sgid(work, param->primary_path); 1796 if (cm_req_has_alt_path(req_msg)) { 1797 param->alternate_path = &work->path[1]; 1798 cm_opa_to_ib_sgid(work, param->alternate_path); 1799 } else { 1800 param->alternate_path = NULL; 1801 } 1802 param->remote_ca_guid = 1803 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg)); 1804 param->remote_qkey = IBA_GET(CM_REQ_LOCAL_Q_KEY, req_msg); 1805 param->remote_qpn = IBA_GET(CM_REQ_LOCAL_QPN, req_msg); 1806 param->qp_type = cm_req_get_qp_type(req_msg); 1807 param->starting_psn = IBA_GET(CM_REQ_STARTING_PSN, req_msg); 1808 param->responder_resources = IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg); 1809 param->initiator_depth = IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg); 1810 param->local_cm_response_timeout = 1811 IBA_GET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg); 1812 param->flow_control = IBA_GET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg); 1813 param->remote_cm_response_timeout = 1814 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg); 1815 param->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg); 1816 param->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg); 1817 param->srq = IBA_GET(CM_REQ_SRQ, req_msg); 1818 param->ppath_sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr; 1819 param->ece.vendor_id = IBA_GET(CM_REQ_VENDOR_ID, req_msg); 1820 param->ece.attr_mod = be32_to_cpu(req_msg->hdr.attr_mod); 1821 1822 work->cm_event.private_data = 1823 IBA_GET_MEM_PTR(CM_REQ_PRIVATE_DATA, req_msg); 1824 } 1825 1826 static void cm_process_work(struct cm_id_private *cm_id_priv, 1827 struct cm_work *work) 1828 { 1829 int ret; 1830 1831 /* We will typically only have the current event to report. */ 1832 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1833 cm_free_work(work); 1834 1835 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1836 spin_lock_irq(&cm_id_priv->lock); 1837 work = cm_dequeue_work(cm_id_priv); 1838 spin_unlock_irq(&cm_id_priv->lock); 1839 if (!work) 1840 return; 1841 1842 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1843 &work->cm_event); 1844 cm_free_work(work); 1845 } 1846 cm_deref_id(cm_id_priv); 1847 if (ret) 1848 cm_destroy_id(&cm_id_priv->id, ret); 1849 } 1850 1851 static void cm_format_mra(struct cm_mra_msg *mra_msg, 1852 struct cm_id_private *cm_id_priv, 1853 enum cm_msg_response msg_mraed, u8 service_timeout, 1854 const void *private_data, u8 private_data_len) 1855 { 1856 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1857 IBA_SET(CM_MRA_MESSAGE_MRAED, mra_msg, msg_mraed); 1858 IBA_SET(CM_MRA_LOCAL_COMM_ID, mra_msg, 1859 be32_to_cpu(cm_id_priv->id.local_id)); 1860 IBA_SET(CM_MRA_REMOTE_COMM_ID, mra_msg, 1861 be32_to_cpu(cm_id_priv->id.remote_id)); 1862 IBA_SET(CM_MRA_SERVICE_TIMEOUT, mra_msg, service_timeout); 1863 1864 if (private_data && private_data_len) 1865 IBA_SET_MEM(CM_MRA_PRIVATE_DATA, mra_msg, private_data, 1866 private_data_len); 1867 } 1868 1869 static void cm_format_rej(struct cm_rej_msg *rej_msg, 1870 struct cm_id_private *cm_id_priv, 1871 enum ib_cm_rej_reason reason, void *ari, 1872 u8 ari_length, const void *private_data, 1873 u8 private_data_len, enum ib_cm_state state) 1874 { 1875 lockdep_assert_held(&cm_id_priv->lock); 1876 1877 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1878 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg, 1879 be32_to_cpu(cm_id_priv->id.remote_id)); 1880 1881 switch (state) { 1882 case IB_CM_REQ_RCVD: 1883 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, be32_to_cpu(0)); 1884 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ); 1885 break; 1886 case IB_CM_MRA_REQ_SENT: 1887 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1888 be32_to_cpu(cm_id_priv->id.local_id)); 1889 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ); 1890 break; 1891 case IB_CM_REP_RCVD: 1892 case IB_CM_MRA_REP_SENT: 1893 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1894 be32_to_cpu(cm_id_priv->id.local_id)); 1895 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REP); 1896 break; 1897 default: 1898 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1899 be32_to_cpu(cm_id_priv->id.local_id)); 1900 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, 1901 CM_MSG_RESPONSE_OTHER); 1902 break; 1903 } 1904 1905 IBA_SET(CM_REJ_REASON, rej_msg, reason); 1906 if (ari && ari_length) { 1907 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length); 1908 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length); 1909 } 1910 1911 if (private_data && private_data_len) 1912 IBA_SET_MEM(CM_REJ_PRIVATE_DATA, rej_msg, private_data, 1913 private_data_len); 1914 } 1915 1916 static void cm_dup_req_handler(struct cm_work *work, 1917 struct cm_id_private *cm_id_priv) 1918 { 1919 struct ib_mad_send_buf *msg = NULL; 1920 int ret; 1921 1922 atomic_long_inc( 1923 &work->port->counters[CM_RECV_DUPLICATES][CM_REQ_COUNTER]); 1924 1925 /* Quick state check to discard duplicate REQs. */ 1926 spin_lock_irq(&cm_id_priv->lock); 1927 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) { 1928 spin_unlock_irq(&cm_id_priv->lock); 1929 return; 1930 } 1931 spin_unlock_irq(&cm_id_priv->lock); 1932 1933 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1934 if (ret) 1935 return; 1936 1937 spin_lock_irq(&cm_id_priv->lock); 1938 switch (cm_id_priv->id.state) { 1939 case IB_CM_MRA_REQ_SENT: 1940 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1941 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1942 cm_id_priv->private_data, 1943 cm_id_priv->private_data_len); 1944 break; 1945 case IB_CM_TIMEWAIT: 1946 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, 1947 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0, 1948 IB_CM_TIMEWAIT); 1949 break; 1950 default: 1951 goto unlock; 1952 } 1953 spin_unlock_irq(&cm_id_priv->lock); 1954 1955 trace_icm_send_dup_req(&cm_id_priv->id); 1956 ret = ib_post_send_mad(msg, NULL); 1957 if (ret) 1958 goto free; 1959 return; 1960 1961 unlock: spin_unlock_irq(&cm_id_priv->lock); 1962 free: cm_free_response_msg(msg); 1963 } 1964 1965 static struct cm_id_private *cm_match_req(struct cm_work *work, 1966 struct cm_id_private *cm_id_priv) 1967 { 1968 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1969 struct cm_timewait_info *timewait_info; 1970 struct cm_req_msg *req_msg; 1971 1972 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1973 1974 /* Check for possible duplicate REQ. */ 1975 spin_lock_irq(&cm.lock); 1976 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1977 if (timewait_info) { 1978 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 1979 timewait_info->work.remote_id); 1980 spin_unlock_irq(&cm.lock); 1981 if (cur_cm_id_priv) { 1982 cm_dup_req_handler(work, cur_cm_id_priv); 1983 cm_deref_id(cur_cm_id_priv); 1984 } 1985 return NULL; 1986 } 1987 1988 /* Check for stale connections. */ 1989 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1990 if (timewait_info) { 1991 cm_remove_remote(cm_id_priv); 1992 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 1993 timewait_info->work.remote_id); 1994 1995 spin_unlock_irq(&cm.lock); 1996 cm_issue_rej(work->port, work->mad_recv_wc, 1997 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1998 NULL, 0); 1999 if (cur_cm_id_priv) { 2000 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0); 2001 cm_deref_id(cur_cm_id_priv); 2002 } 2003 return NULL; 2004 } 2005 2006 /* Find matching listen request. */ 2007 listen_cm_id_priv = cm_find_listen( 2008 cm_id_priv->id.device, 2009 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg))); 2010 if (!listen_cm_id_priv) { 2011 cm_remove_remote(cm_id_priv); 2012 spin_unlock_irq(&cm.lock); 2013 cm_issue_rej(work->port, work->mad_recv_wc, 2014 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 2015 NULL, 0); 2016 return NULL; 2017 } 2018 spin_unlock_irq(&cm.lock); 2019 return listen_cm_id_priv; 2020 } 2021 2022 /* 2023 * Work-around for inter-subnet connections. If the LIDs are permissive, 2024 * we need to override the LID/SL data in the REQ with the LID information 2025 * in the work completion. 2026 */ 2027 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 2028 { 2029 if (!IBA_GET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg)) { 2030 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID, 2031 req_msg)) == IB_LID_PERMISSIVE) { 2032 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 2033 be16_to_cpu(ib_lid_be16(wc->slid))); 2034 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, wc->sl); 2035 } 2036 2037 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID, 2038 req_msg)) == IB_LID_PERMISSIVE) 2039 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, 2040 wc->dlid_path_bits); 2041 } 2042 2043 if (!IBA_GET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg)) { 2044 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, 2045 req_msg)) == IB_LID_PERMISSIVE) { 2046 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, 2047 be16_to_cpu(ib_lid_be16(wc->slid))); 2048 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, wc->sl); 2049 } 2050 2051 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, 2052 req_msg)) == IB_LID_PERMISSIVE) 2053 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, 2054 wc->dlid_path_bits); 2055 } 2056 } 2057 2058 static int cm_req_handler(struct cm_work *work) 2059 { 2060 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 2061 struct cm_req_msg *req_msg; 2062 const struct ib_global_route *grh; 2063 const struct ib_gid_attr *gid_attr; 2064 int ret; 2065 2066 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 2067 2068 cm_id_priv = 2069 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL); 2070 if (IS_ERR(cm_id_priv)) 2071 return PTR_ERR(cm_id_priv); 2072 2073 cm_id_priv->id.remote_id = 2074 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_COMM_ID, req_msg)); 2075 cm_id_priv->id.service_id = 2076 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 2077 cm_id_priv->tid = req_msg->hdr.tid; 2078 cm_id_priv->timeout_ms = cm_convert_to_ms( 2079 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg)); 2080 cm_id_priv->max_cm_retries = IBA_GET(CM_REQ_MAX_CM_RETRIES, req_msg); 2081 cm_id_priv->remote_qpn = 2082 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg)); 2083 cm_id_priv->initiator_depth = 2084 IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg); 2085 cm_id_priv->responder_resources = 2086 IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg); 2087 cm_id_priv->path_mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 2088 cm_id_priv->pkey = cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 2089 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg)); 2090 cm_id_priv->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg); 2091 cm_id_priv->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg); 2092 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 2093 2094 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2095 work->mad_recv_wc->recv_buf.grh, 2096 &cm_id_priv->av); 2097 if (ret) 2098 goto destroy; 2099 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 2100 id.local_id); 2101 if (IS_ERR(cm_id_priv->timewait_info)) { 2102 ret = PTR_ERR(cm_id_priv->timewait_info); 2103 cm_id_priv->timewait_info = NULL; 2104 goto destroy; 2105 } 2106 cm_id_priv->timewait_info->work.remote_id = cm_id_priv->id.remote_id; 2107 cm_id_priv->timewait_info->remote_ca_guid = 2108 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg)); 2109 cm_id_priv->timewait_info->remote_qpn = cm_id_priv->remote_qpn; 2110 2111 /* 2112 * Note that the ID pointer is not in the xarray at this point, 2113 * so this set is only visible to the local thread. 2114 */ 2115 cm_id_priv->id.state = IB_CM_REQ_RCVD; 2116 2117 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 2118 if (!listen_cm_id_priv) { 2119 trace_icm_no_listener_err(&cm_id_priv->id); 2120 cm_id_priv->id.state = IB_CM_IDLE; 2121 ret = -EINVAL; 2122 goto destroy; 2123 } 2124 2125 memset(&work->path[0], 0, sizeof(work->path[0])); 2126 if (cm_req_has_alt_path(req_msg)) 2127 memset(&work->path[1], 0, sizeof(work->path[1])); 2128 grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr); 2129 gid_attr = grh->sgid_attr; 2130 2131 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE) { 2132 work->path[0].rec_type = 2133 sa_conv_gid_to_pathrec_type(gid_attr->gid_type); 2134 } else { 2135 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 2136 cm_path_set_rec_type( 2137 work->port->cm_dev->ib_device, work->port->port_num, 2138 &work->path[0], 2139 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, 2140 req_msg)); 2141 } 2142 if (cm_req_has_alt_path(req_msg)) 2143 work->path[1].rec_type = work->path[0].rec_type; 2144 cm_format_paths_from_req(req_msg, &work->path[0], 2145 &work->path[1], work->mad_recv_wc->wc); 2146 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE) 2147 sa_path_set_dmac(&work->path[0], 2148 cm_id_priv->av.ah_attr.roce.dmac); 2149 work->path[0].hop_limit = grh->hop_limit; 2150 2151 /* This destroy call is needed to pair with cm_init_av_for_response */ 2152 cm_destroy_av(&cm_id_priv->av); 2153 ret = cm_init_av_by_path(&work->path[0], gid_attr, &cm_id_priv->av); 2154 if (ret) { 2155 int err; 2156 2157 err = rdma_query_gid(work->port->cm_dev->ib_device, 2158 work->port->port_num, 0, 2159 &work->path[0].sgid); 2160 if (err) 2161 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID, 2162 NULL, 0, NULL, 0); 2163 else 2164 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID, 2165 &work->path[0].sgid, 2166 sizeof(work->path[0].sgid), 2167 NULL, 0); 2168 goto rejected; 2169 } 2170 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_IB) 2171 cm_id_priv->av.dlid_datapath = 2172 IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg); 2173 2174 if (cm_req_has_alt_path(req_msg)) { 2175 ret = cm_init_av_by_path(&work->path[1], NULL, 2176 &cm_id_priv->alt_av); 2177 if (ret) { 2178 ib_send_cm_rej(&cm_id_priv->id, 2179 IB_CM_REJ_INVALID_ALT_GID, 2180 &work->path[0].sgid, 2181 sizeof(work->path[0].sgid), NULL, 0); 2182 goto rejected; 2183 } 2184 } 2185 2186 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 2187 cm_id_priv->id.context = listen_cm_id_priv->id.context; 2188 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 2189 2190 /* Now MAD handlers can see the new ID */ 2191 spin_lock_irq(&cm_id_priv->lock); 2192 cm_finalize_id(cm_id_priv); 2193 2194 /* Refcount belongs to the event, pairs with cm_process_work() */ 2195 refcount_inc(&cm_id_priv->refcount); 2196 cm_queue_work_unlock(cm_id_priv, work); 2197 /* 2198 * Since this ID was just created and was not made visible to other MAD 2199 * handlers until the cm_finalize_id() above we know that the 2200 * cm_process_work() will deliver the event and the listen_cm_id 2201 * embedded in the event can be derefed here. 2202 */ 2203 cm_deref_id(listen_cm_id_priv); 2204 return 0; 2205 2206 rejected: 2207 cm_deref_id(listen_cm_id_priv); 2208 destroy: 2209 ib_destroy_cm_id(&cm_id_priv->id); 2210 return ret; 2211 } 2212 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_priv->timeout_ms = param->timeout_ms; 3488 cm_id_priv->max_cm_retries = param->max_cm_retries; 3489 if (cm_id->state != IB_CM_IDLE) { 3490 ret = -EINVAL; 3491 goto out_unlock; 3492 } 3493 3494 msg = cm_alloc_priv_msg(cm_id_priv); 3495 if (IS_ERR(msg)) { 3496 ret = PTR_ERR(msg); 3497 goto out_unlock; 3498 } 3499 3500 cm_format_sidr_req((struct cm_sidr_req_msg *)msg->mad, cm_id_priv, 3501 param); 3502 msg->timeout_ms = cm_id_priv->timeout_ms; 3503 msg->context[1] = (void *)(unsigned long)IB_CM_SIDR_REQ_SENT; 3504 3505 trace_icm_send_sidr_req(&cm_id_priv->id); 3506 ret = ib_post_send_mad(msg, NULL); 3507 if (ret) 3508 goto out_free; 3509 cm_id->state = IB_CM_SIDR_REQ_SENT; 3510 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3511 return 0; 3512 out_free: 3513 cm_free_priv_msg(msg); 3514 out_unlock: 3515 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3516 return ret; 3517 } 3518 EXPORT_SYMBOL(ib_send_cm_sidr_req); 3519 3520 static void cm_format_sidr_req_event(struct cm_work *work, 3521 const struct cm_id_private *rx_cm_id, 3522 struct ib_cm_id *listen_id) 3523 { 3524 struct cm_sidr_req_msg *sidr_req_msg; 3525 struct ib_cm_sidr_req_event_param *param; 3526 3527 sidr_req_msg = (struct cm_sidr_req_msg *) 3528 work->mad_recv_wc->recv_buf.mad; 3529 param = &work->cm_event.param.sidr_req_rcvd; 3530 param->pkey = IBA_GET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg); 3531 param->listen_id = listen_id; 3532 param->service_id = 3533 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg)); 3534 param->bth_pkey = cm_get_bth_pkey(work); 3535 param->port = work->port->port_num; 3536 param->sgid_attr = rx_cm_id->av.ah_attr.grh.sgid_attr; 3537 work->cm_event.private_data = 3538 IBA_GET_MEM_PTR(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg); 3539 } 3540 3541 static int cm_sidr_req_handler(struct cm_work *work) 3542 { 3543 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 3544 struct cm_sidr_req_msg *sidr_req_msg; 3545 struct ib_wc *wc; 3546 int ret; 3547 3548 cm_id_priv = 3549 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL); 3550 if (IS_ERR(cm_id_priv)) 3551 return PTR_ERR(cm_id_priv); 3552 3553 /* Record SGID/SLID and request ID for lookup. */ 3554 sidr_req_msg = (struct cm_sidr_req_msg *) 3555 work->mad_recv_wc->recv_buf.mad; 3556 3557 cm_id_priv->id.remote_id = 3558 cpu_to_be32(IBA_GET(CM_SIDR_REQ_REQUESTID, sidr_req_msg)); 3559 cm_id_priv->id.service_id = 3560 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg)); 3561 cm_id_priv->tid = sidr_req_msg->hdr.tid; 3562 3563 wc = work->mad_recv_wc->wc; 3564 cm_id_priv->sidr_slid = wc->slid; 3565 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 3566 work->mad_recv_wc->recv_buf.grh, 3567 &cm_id_priv->av); 3568 if (ret) 3569 goto out; 3570 3571 spin_lock_irq(&cm.lock); 3572 listen_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 3573 if (listen_cm_id_priv) { 3574 spin_unlock_irq(&cm.lock); 3575 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 3576 [CM_SIDR_REQ_COUNTER]); 3577 goto out; /* Duplicate message. */ 3578 } 3579 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3580 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 3581 cm_id_priv->id.service_id); 3582 if (!listen_cm_id_priv) { 3583 spin_unlock_irq(&cm.lock); 3584 ib_send_cm_sidr_rep(&cm_id_priv->id, 3585 &(struct ib_cm_sidr_rep_param){ 3586 .status = IB_SIDR_UNSUPPORTED }); 3587 goto out; /* No match. */ 3588 } 3589 spin_unlock_irq(&cm.lock); 3590 3591 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 3592 cm_id_priv->id.context = listen_cm_id_priv->id.context; 3593 3594 /* 3595 * A SIDR ID does not need to be in the xarray since it does not receive 3596 * mads, is not placed in the remote_id or remote_qpn rbtree, and does 3597 * not enter timewait. 3598 */ 3599 3600 cm_format_sidr_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 3601 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 3602 cm_free_work(work); 3603 /* 3604 * A pointer to the listen_cm_id is held in the event, so this deref 3605 * must be after the event is delivered above. 3606 */ 3607 cm_deref_id(listen_cm_id_priv); 3608 if (ret) 3609 cm_destroy_id(&cm_id_priv->id, ret); 3610 return 0; 3611 out: 3612 ib_destroy_cm_id(&cm_id_priv->id); 3613 return -EINVAL; 3614 } 3615 3616 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3617 struct cm_id_private *cm_id_priv, 3618 struct ib_cm_sidr_rep_param *param) 3619 { 3620 cm_format_mad_ece_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3621 cm_id_priv->tid, param->ece.attr_mod); 3622 IBA_SET(CM_SIDR_REP_REQUESTID, sidr_rep_msg, 3623 be32_to_cpu(cm_id_priv->id.remote_id)); 3624 IBA_SET(CM_SIDR_REP_STATUS, sidr_rep_msg, param->status); 3625 IBA_SET(CM_SIDR_REP_QPN, sidr_rep_msg, param->qp_num); 3626 IBA_SET(CM_SIDR_REP_SERVICEID, sidr_rep_msg, 3627 be64_to_cpu(cm_id_priv->id.service_id)); 3628 IBA_SET(CM_SIDR_REP_Q_KEY, sidr_rep_msg, param->qkey); 3629 IBA_SET(CM_SIDR_REP_VENDOR_ID_L, sidr_rep_msg, 3630 param->ece.vendor_id & 0xFF); 3631 IBA_SET(CM_SIDR_REP_VENDOR_ID_H, sidr_rep_msg, 3632 (param->ece.vendor_id >> 8) & 0xFF); 3633 3634 if (param->info && param->info_length) 3635 IBA_SET_MEM(CM_SIDR_REP_ADDITIONAL_INFORMATION, sidr_rep_msg, 3636 param->info, param->info_length); 3637 3638 if (param->private_data && param->private_data_len) 3639 IBA_SET_MEM(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg, 3640 param->private_data, param->private_data_len); 3641 } 3642 3643 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv, 3644 struct ib_cm_sidr_rep_param *param) 3645 { 3646 struct ib_mad_send_buf *msg; 3647 unsigned long flags; 3648 int ret; 3649 3650 lockdep_assert_held(&cm_id_priv->lock); 3651 3652 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3653 (param->private_data && 3654 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3655 return -EINVAL; 3656 3657 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_RCVD) 3658 return -EINVAL; 3659 3660 msg = cm_alloc_msg(cm_id_priv); 3661 if (IS_ERR(msg)) 3662 return PTR_ERR(msg); 3663 3664 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3665 param); 3666 trace_icm_send_sidr_rep(&cm_id_priv->id); 3667 ret = ib_post_send_mad(msg, NULL); 3668 if (ret) { 3669 cm_free_msg(msg); 3670 return ret; 3671 } 3672 cm_id_priv->id.state = IB_CM_IDLE; 3673 spin_lock_irqsave(&cm.lock, flags); 3674 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) { 3675 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3676 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); 3677 } 3678 spin_unlock_irqrestore(&cm.lock, flags); 3679 return 0; 3680 } 3681 3682 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3683 struct ib_cm_sidr_rep_param *param) 3684 { 3685 struct cm_id_private *cm_id_priv = 3686 container_of(cm_id, struct cm_id_private, id); 3687 unsigned long flags; 3688 int ret; 3689 3690 spin_lock_irqsave(&cm_id_priv->lock, flags); 3691 ret = cm_send_sidr_rep_locked(cm_id_priv, param); 3692 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3693 return ret; 3694 } 3695 EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3696 3697 static void cm_format_sidr_rep_event(struct cm_work *work, 3698 const struct cm_id_private *cm_id_priv) 3699 { 3700 struct cm_sidr_rep_msg *sidr_rep_msg; 3701 struct ib_cm_sidr_rep_event_param *param; 3702 3703 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3704 work->mad_recv_wc->recv_buf.mad; 3705 param = &work->cm_event.param.sidr_rep_rcvd; 3706 param->status = IBA_GET(CM_SIDR_REP_STATUS, sidr_rep_msg); 3707 param->qkey = IBA_GET(CM_SIDR_REP_Q_KEY, sidr_rep_msg); 3708 param->qpn = IBA_GET(CM_SIDR_REP_QPN, sidr_rep_msg); 3709 param->info = IBA_GET_MEM_PTR(CM_SIDR_REP_ADDITIONAL_INFORMATION, 3710 sidr_rep_msg); 3711 param->info_len = IBA_GET(CM_SIDR_REP_ADDITIONAL_INFORMATION_LENGTH, 3712 sidr_rep_msg); 3713 param->sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr; 3714 work->cm_event.private_data = 3715 IBA_GET_MEM_PTR(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg); 3716 } 3717 3718 static int cm_sidr_rep_handler(struct cm_work *work) 3719 { 3720 struct cm_sidr_rep_msg *sidr_rep_msg; 3721 struct cm_id_private *cm_id_priv; 3722 3723 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3724 work->mad_recv_wc->recv_buf.mad; 3725 cm_id_priv = cm_acquire_id( 3726 cpu_to_be32(IBA_GET(CM_SIDR_REP_REQUESTID, sidr_rep_msg)), 0); 3727 if (!cm_id_priv) 3728 return -EINVAL; /* Unmatched reply. */ 3729 3730 spin_lock_irq(&cm_id_priv->lock); 3731 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3732 spin_unlock_irq(&cm_id_priv->lock); 3733 goto out; 3734 } 3735 cm_id_priv->id.state = IB_CM_IDLE; 3736 ib_cancel_mad(cm_id_priv->msg); 3737 spin_unlock_irq(&cm_id_priv->lock); 3738 3739 cm_format_sidr_rep_event(work, cm_id_priv); 3740 cm_process_work(cm_id_priv, work); 3741 return 0; 3742 out: 3743 cm_deref_id(cm_id_priv); 3744 return -EINVAL; 3745 } 3746 3747 static void cm_process_send_error(struct cm_id_private *cm_id_priv, 3748 struct ib_mad_send_buf *msg, 3749 enum ib_cm_state state, 3750 enum ib_wc_status wc_status) 3751 { 3752 struct ib_cm_event cm_event = {}; 3753 int ret; 3754 3755 /* Discard old sends or ones without a response. */ 3756 spin_lock_irq(&cm_id_priv->lock); 3757 if (msg != cm_id_priv->msg) { 3758 spin_unlock_irq(&cm_id_priv->lock); 3759 cm_free_msg(msg); 3760 return; 3761 } 3762 cm_free_priv_msg(msg); 3763 3764 if (state != cm_id_priv->id.state || wc_status == IB_WC_SUCCESS || 3765 wc_status == IB_WC_WR_FLUSH_ERR) 3766 goto out_unlock; 3767 3768 trace_icm_mad_send_err(state, wc_status); 3769 switch (state) { 3770 case IB_CM_REQ_SENT: 3771 case IB_CM_MRA_REQ_RCVD: 3772 cm_reset_to_idle(cm_id_priv); 3773 cm_event.event = IB_CM_REQ_ERROR; 3774 break; 3775 case IB_CM_REP_SENT: 3776 case IB_CM_MRA_REP_RCVD: 3777 cm_reset_to_idle(cm_id_priv); 3778 cm_event.event = IB_CM_REP_ERROR; 3779 break; 3780 case IB_CM_DREQ_SENT: 3781 cm_enter_timewait(cm_id_priv); 3782 cm_event.event = IB_CM_DREQ_ERROR; 3783 break; 3784 case IB_CM_SIDR_REQ_SENT: 3785 cm_id_priv->id.state = IB_CM_IDLE; 3786 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3787 break; 3788 default: 3789 goto out_unlock; 3790 } 3791 spin_unlock_irq(&cm_id_priv->lock); 3792 cm_event.param.send_status = wc_status; 3793 3794 /* No other events can occur on the cm_id at this point. */ 3795 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3796 if (ret) 3797 ib_destroy_cm_id(&cm_id_priv->id); 3798 return; 3799 out_unlock: 3800 spin_unlock_irq(&cm_id_priv->lock); 3801 } 3802 3803 static void cm_send_handler(struct ib_mad_agent *mad_agent, 3804 struct ib_mad_send_wc *mad_send_wc) 3805 { 3806 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3807 struct cm_id_private *cm_id_priv = msg->context[0]; 3808 enum ib_cm_state state = 3809 (enum ib_cm_state)(unsigned long)msg->context[1]; 3810 struct cm_port *port; 3811 u16 attr_index; 3812 3813 port = mad_agent->context; 3814 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3815 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3816 3817 /* 3818 * If the send was in response to a received message (context[0] is not 3819 * set to a cm_id), and is not a REJ, then it is a send that was 3820 * manually retried. 3821 */ 3822 if (!cm_id_priv && (attr_index != CM_REJ_COUNTER)) 3823 msg->retries = 1; 3824 3825 atomic_long_add(1 + msg->retries, &port->counters[CM_XMIT][attr_index]); 3826 if (msg->retries) 3827 atomic_long_add(msg->retries, 3828 &port->counters[CM_XMIT_RETRIES][attr_index]); 3829 3830 if (cm_id_priv) 3831 cm_process_send_error(cm_id_priv, msg, state, 3832 mad_send_wc->status); 3833 else 3834 cm_free_response_msg(msg); 3835 } 3836 3837 static void cm_work_handler(struct work_struct *_work) 3838 { 3839 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3840 int ret; 3841 3842 switch (work->cm_event.event) { 3843 case IB_CM_REQ_RECEIVED: 3844 ret = cm_req_handler(work); 3845 break; 3846 case IB_CM_MRA_RECEIVED: 3847 ret = cm_mra_handler(work); 3848 break; 3849 case IB_CM_REJ_RECEIVED: 3850 ret = cm_rej_handler(work); 3851 break; 3852 case IB_CM_REP_RECEIVED: 3853 ret = cm_rep_handler(work); 3854 break; 3855 case IB_CM_RTU_RECEIVED: 3856 ret = cm_rtu_handler(work); 3857 break; 3858 case IB_CM_USER_ESTABLISHED: 3859 ret = cm_establish_handler(work); 3860 break; 3861 case IB_CM_DREQ_RECEIVED: 3862 ret = cm_dreq_handler(work); 3863 break; 3864 case IB_CM_DREP_RECEIVED: 3865 ret = cm_drep_handler(work); 3866 break; 3867 case IB_CM_SIDR_REQ_RECEIVED: 3868 ret = cm_sidr_req_handler(work); 3869 break; 3870 case IB_CM_SIDR_REP_RECEIVED: 3871 ret = cm_sidr_rep_handler(work); 3872 break; 3873 case IB_CM_LAP_RECEIVED: 3874 ret = cm_lap_handler(work); 3875 break; 3876 case IB_CM_APR_RECEIVED: 3877 ret = cm_apr_handler(work); 3878 break; 3879 case IB_CM_TIMEWAIT_EXIT: 3880 ret = cm_timewait_handler(work); 3881 break; 3882 default: 3883 trace_icm_handler_err(work->cm_event.event); 3884 ret = -EINVAL; 3885 break; 3886 } 3887 if (ret) 3888 cm_free_work(work); 3889 } 3890 3891 static int cm_establish(struct ib_cm_id *cm_id) 3892 { 3893 struct cm_id_private *cm_id_priv; 3894 struct cm_work *work; 3895 unsigned long flags; 3896 int ret = 0; 3897 struct cm_device *cm_dev; 3898 3899 cm_dev = ib_get_client_data(cm_id->device, &cm_client); 3900 if (!cm_dev) 3901 return -ENODEV; 3902 3903 work = kmalloc(sizeof *work, GFP_ATOMIC); 3904 if (!work) 3905 return -ENOMEM; 3906 3907 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3908 spin_lock_irqsave(&cm_id_priv->lock, flags); 3909 switch (cm_id->state) { 3910 case IB_CM_REP_SENT: 3911 case IB_CM_MRA_REP_RCVD: 3912 cm_id->state = IB_CM_ESTABLISHED; 3913 break; 3914 case IB_CM_ESTABLISHED: 3915 ret = -EISCONN; 3916 break; 3917 default: 3918 trace_icm_establish_err(cm_id); 3919 ret = -EINVAL; 3920 break; 3921 } 3922 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3923 3924 if (ret) { 3925 kfree(work); 3926 goto out; 3927 } 3928 3929 /* 3930 * The CM worker thread may try to destroy the cm_id before it 3931 * can execute this work item. To prevent potential deadlock, 3932 * we need to find the cm_id once we're in the context of the 3933 * worker thread, rather than holding a reference on it. 3934 */ 3935 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3936 work->local_id = cm_id->local_id; 3937 work->remote_id = cm_id->remote_id; 3938 work->mad_recv_wc = NULL; 3939 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3940 3941 /* Check if the device started its remove_one */ 3942 spin_lock_irqsave(&cm.lock, flags); 3943 if (!cm_dev->going_down) { 3944 queue_delayed_work(cm.wq, &work->work, 0); 3945 } else { 3946 kfree(work); 3947 ret = -ENODEV; 3948 } 3949 spin_unlock_irqrestore(&cm.lock, flags); 3950 3951 out: 3952 return ret; 3953 } 3954 3955 static int cm_migrate(struct ib_cm_id *cm_id) 3956 { 3957 struct cm_id_private *cm_id_priv; 3958 unsigned long flags; 3959 int ret = 0; 3960 3961 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3962 spin_lock_irqsave(&cm_id_priv->lock, flags); 3963 if (cm_id->state == IB_CM_ESTABLISHED && 3964 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3965 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3966 cm_id->lap_state = IB_CM_LAP_IDLE; 3967 cm_id_priv->av = cm_id_priv->alt_av; 3968 } else 3969 ret = -EINVAL; 3970 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3971 3972 return ret; 3973 } 3974 3975 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3976 { 3977 int ret; 3978 3979 switch (event) { 3980 case IB_EVENT_COMM_EST: 3981 ret = cm_establish(cm_id); 3982 break; 3983 case IB_EVENT_PATH_MIG: 3984 ret = cm_migrate(cm_id); 3985 break; 3986 default: 3987 ret = -EINVAL; 3988 } 3989 return ret; 3990 } 3991 EXPORT_SYMBOL(ib_cm_notify); 3992 3993 static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3994 struct ib_mad_send_buf *send_buf, 3995 struct ib_mad_recv_wc *mad_recv_wc) 3996 { 3997 struct cm_port *port = mad_agent->context; 3998 struct cm_work *work; 3999 enum ib_cm_event_type event; 4000 bool alt_path = false; 4001 u16 attr_id; 4002 int paths = 0; 4003 int going_down = 0; 4004 4005 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 4006 case CM_REQ_ATTR_ID: 4007 alt_path = cm_req_has_alt_path((struct cm_req_msg *) 4008 mad_recv_wc->recv_buf.mad); 4009 paths = 1 + (alt_path != 0); 4010 event = IB_CM_REQ_RECEIVED; 4011 break; 4012 case CM_MRA_ATTR_ID: 4013 event = IB_CM_MRA_RECEIVED; 4014 break; 4015 case CM_REJ_ATTR_ID: 4016 event = IB_CM_REJ_RECEIVED; 4017 break; 4018 case CM_REP_ATTR_ID: 4019 event = IB_CM_REP_RECEIVED; 4020 break; 4021 case CM_RTU_ATTR_ID: 4022 event = IB_CM_RTU_RECEIVED; 4023 break; 4024 case CM_DREQ_ATTR_ID: 4025 event = IB_CM_DREQ_RECEIVED; 4026 break; 4027 case CM_DREP_ATTR_ID: 4028 event = IB_CM_DREP_RECEIVED; 4029 break; 4030 case CM_SIDR_REQ_ATTR_ID: 4031 event = IB_CM_SIDR_REQ_RECEIVED; 4032 break; 4033 case CM_SIDR_REP_ATTR_ID: 4034 event = IB_CM_SIDR_REP_RECEIVED; 4035 break; 4036 case CM_LAP_ATTR_ID: 4037 paths = 1; 4038 event = IB_CM_LAP_RECEIVED; 4039 break; 4040 case CM_APR_ATTR_ID: 4041 event = IB_CM_APR_RECEIVED; 4042 break; 4043 default: 4044 ib_free_recv_mad(mad_recv_wc); 4045 return; 4046 } 4047 4048 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 4049 atomic_long_inc(&port->counters[CM_RECV][attr_id - CM_ATTR_ID_OFFSET]); 4050 4051 work = kmalloc(struct_size(work, path, paths), GFP_KERNEL); 4052 if (!work) { 4053 ib_free_recv_mad(mad_recv_wc); 4054 return; 4055 } 4056 4057 INIT_DELAYED_WORK(&work->work, cm_work_handler); 4058 work->cm_event.event = event; 4059 work->mad_recv_wc = mad_recv_wc; 4060 work->port = port; 4061 4062 /* Check if the device started its remove_one */ 4063 spin_lock_irq(&cm.lock); 4064 if (!port->cm_dev->going_down) 4065 queue_delayed_work(cm.wq, &work->work, 0); 4066 else 4067 going_down = 1; 4068 spin_unlock_irq(&cm.lock); 4069 4070 if (going_down) { 4071 kfree(work); 4072 ib_free_recv_mad(mad_recv_wc); 4073 } 4074 } 4075 4076 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 4077 struct ib_qp_attr *qp_attr, 4078 int *qp_attr_mask) 4079 { 4080 unsigned long flags; 4081 int ret; 4082 4083 spin_lock_irqsave(&cm_id_priv->lock, flags); 4084 switch (cm_id_priv->id.state) { 4085 case IB_CM_REQ_SENT: 4086 case IB_CM_MRA_REQ_RCVD: 4087 case IB_CM_REQ_RCVD: 4088 case IB_CM_MRA_REQ_SENT: 4089 case IB_CM_REP_RCVD: 4090 case IB_CM_MRA_REP_SENT: 4091 case IB_CM_REP_SENT: 4092 case IB_CM_MRA_REP_RCVD: 4093 case IB_CM_ESTABLISHED: 4094 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 4095 IB_QP_PKEY_INDEX | IB_QP_PORT; 4096 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 4097 if (cm_id_priv->responder_resources) { 4098 struct ib_device *ib_dev = cm_id_priv->id.device; 4099 u64 support_flush = ib_dev->attrs.device_cap_flags & 4100 (IB_DEVICE_FLUSH_GLOBAL | IB_DEVICE_FLUSH_PERSISTENT); 4101 u32 flushable = support_flush ? 4102 (IB_ACCESS_FLUSH_GLOBAL | 4103 IB_ACCESS_FLUSH_PERSISTENT) : 0; 4104 4105 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 4106 IB_ACCESS_REMOTE_ATOMIC | 4107 flushable; 4108 } 4109 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 4110 if (cm_id_priv->av.port) 4111 qp_attr->port_num = cm_id_priv->av.port->port_num; 4112 ret = 0; 4113 break; 4114 default: 4115 trace_icm_qp_init_err(&cm_id_priv->id); 4116 ret = -EINVAL; 4117 break; 4118 } 4119 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4120 return ret; 4121 } 4122 4123 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 4124 struct ib_qp_attr *qp_attr, 4125 int *qp_attr_mask) 4126 { 4127 unsigned long flags; 4128 int ret; 4129 4130 spin_lock_irqsave(&cm_id_priv->lock, flags); 4131 switch (cm_id_priv->id.state) { 4132 case IB_CM_REQ_RCVD: 4133 case IB_CM_MRA_REQ_SENT: 4134 case IB_CM_REP_RCVD: 4135 case IB_CM_MRA_REP_SENT: 4136 case IB_CM_REP_SENT: 4137 case IB_CM_MRA_REP_RCVD: 4138 case IB_CM_ESTABLISHED: 4139 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 4140 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 4141 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 4142 if ((qp_attr->ah_attr.type == RDMA_AH_ATTR_TYPE_IB) && 4143 cm_id_priv->av.dlid_datapath && 4144 (cm_id_priv->av.dlid_datapath != 0xffff)) 4145 qp_attr->ah_attr.ib.dlid = cm_id_priv->av.dlid_datapath; 4146 qp_attr->path_mtu = cm_id_priv->path_mtu; 4147 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 4148 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 4149 if (cm_id_priv->qp_type == IB_QPT_RC || 4150 cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 4151 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 4152 IB_QP_MIN_RNR_TIMER; 4153 qp_attr->max_dest_rd_atomic = 4154 cm_id_priv->responder_resources; 4155 qp_attr->min_rnr_timer = 0; 4156 } 4157 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr) && 4158 cm_id_priv->alt_av.port) { 4159 *qp_attr_mask |= IB_QP_ALT_PATH; 4160 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 4161 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 4162 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 4163 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 4164 } 4165 ret = 0; 4166 break; 4167 default: 4168 trace_icm_qp_rtr_err(&cm_id_priv->id); 4169 ret = -EINVAL; 4170 break; 4171 } 4172 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4173 return ret; 4174 } 4175 4176 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 4177 struct ib_qp_attr *qp_attr, 4178 int *qp_attr_mask) 4179 { 4180 unsigned long flags; 4181 int ret; 4182 4183 spin_lock_irqsave(&cm_id_priv->lock, flags); 4184 switch (cm_id_priv->id.state) { 4185 /* Allow transition to RTS before sending REP */ 4186 case IB_CM_REQ_RCVD: 4187 case IB_CM_MRA_REQ_SENT: 4188 4189 case IB_CM_REP_RCVD: 4190 case IB_CM_MRA_REP_SENT: 4191 case IB_CM_REP_SENT: 4192 case IB_CM_MRA_REP_RCVD: 4193 case IB_CM_ESTABLISHED: 4194 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 4195 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 4196 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 4197 switch (cm_id_priv->qp_type) { 4198 case IB_QPT_RC: 4199 case IB_QPT_XRC_INI: 4200 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY | 4201 IB_QP_MAX_QP_RD_ATOMIC; 4202 qp_attr->retry_cnt = cm_id_priv->retry_count; 4203 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 4204 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 4205 fallthrough; 4206 case IB_QPT_XRC_TGT: 4207 *qp_attr_mask |= IB_QP_TIMEOUT; 4208 qp_attr->timeout = cm_id_priv->av.timeout; 4209 break; 4210 default: 4211 break; 4212 } 4213 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) { 4214 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 4215 qp_attr->path_mig_state = IB_MIG_REARM; 4216 } 4217 } else { 4218 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 4219 if (cm_id_priv->alt_av.port) 4220 qp_attr->alt_port_num = 4221 cm_id_priv->alt_av.port->port_num; 4222 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 4223 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 4224 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 4225 qp_attr->path_mig_state = IB_MIG_REARM; 4226 } 4227 ret = 0; 4228 break; 4229 default: 4230 trace_icm_qp_rts_err(&cm_id_priv->id); 4231 ret = -EINVAL; 4232 break; 4233 } 4234 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4235 return ret; 4236 } 4237 4238 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 4239 struct ib_qp_attr *qp_attr, 4240 int *qp_attr_mask) 4241 { 4242 struct cm_id_private *cm_id_priv; 4243 int ret; 4244 4245 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 4246 switch (qp_attr->qp_state) { 4247 case IB_QPS_INIT: 4248 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 4249 break; 4250 case IB_QPS_RTR: 4251 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 4252 break; 4253 case IB_QPS_RTS: 4254 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 4255 break; 4256 default: 4257 ret = -EINVAL; 4258 break; 4259 } 4260 return ret; 4261 } 4262 EXPORT_SYMBOL(ib_cm_init_qp_attr); 4263 4264 static ssize_t cm_show_counter(struct ib_device *ibdev, u32 port_num, 4265 struct ib_port_attribute *attr, char *buf) 4266 { 4267 struct cm_counter_attribute *cm_attr = 4268 container_of(attr, struct cm_counter_attribute, attr); 4269 struct cm_device *cm_dev = ib_get_client_data(ibdev, &cm_client); 4270 4271 if (WARN_ON(!cm_dev)) 4272 return -EINVAL; 4273 4274 return sysfs_emit( 4275 buf, "%ld\n", 4276 atomic_long_read( 4277 &cm_dev->port[port_num - 1] 4278 ->counters[cm_attr->group][cm_attr->index])); 4279 } 4280 4281 #define CM_COUNTER_ATTR(_name, _group, _index) \ 4282 { \ 4283 .attr = __ATTR(_name, 0444, cm_show_counter, NULL), \ 4284 .group = _group, .index = _index \ 4285 } 4286 4287 #define CM_COUNTER_GROUP(_group, _name) \ 4288 static struct cm_counter_attribute cm_counter_attr_##_group[] = { \ 4289 CM_COUNTER_ATTR(req, _group, CM_REQ_COUNTER), \ 4290 CM_COUNTER_ATTR(mra, _group, CM_MRA_COUNTER), \ 4291 CM_COUNTER_ATTR(rej, _group, CM_REJ_COUNTER), \ 4292 CM_COUNTER_ATTR(rep, _group, CM_REP_COUNTER), \ 4293 CM_COUNTER_ATTR(rtu, _group, CM_RTU_COUNTER), \ 4294 CM_COUNTER_ATTR(dreq, _group, CM_DREQ_COUNTER), \ 4295 CM_COUNTER_ATTR(drep, _group, CM_DREP_COUNTER), \ 4296 CM_COUNTER_ATTR(sidr_req, _group, CM_SIDR_REQ_COUNTER), \ 4297 CM_COUNTER_ATTR(sidr_rep, _group, CM_SIDR_REP_COUNTER), \ 4298 CM_COUNTER_ATTR(lap, _group, CM_LAP_COUNTER), \ 4299 CM_COUNTER_ATTR(apr, _group, CM_APR_COUNTER), \ 4300 }; \ 4301 static struct attribute *cm_counter_attrs_##_group[] = { \ 4302 &cm_counter_attr_##_group[0].attr.attr, \ 4303 &cm_counter_attr_##_group[1].attr.attr, \ 4304 &cm_counter_attr_##_group[2].attr.attr, \ 4305 &cm_counter_attr_##_group[3].attr.attr, \ 4306 &cm_counter_attr_##_group[4].attr.attr, \ 4307 &cm_counter_attr_##_group[5].attr.attr, \ 4308 &cm_counter_attr_##_group[6].attr.attr, \ 4309 &cm_counter_attr_##_group[7].attr.attr, \ 4310 &cm_counter_attr_##_group[8].attr.attr, \ 4311 &cm_counter_attr_##_group[9].attr.attr, \ 4312 &cm_counter_attr_##_group[10].attr.attr, \ 4313 NULL, \ 4314 }; \ 4315 static const struct attribute_group cm_counter_group_##_group = { \ 4316 .name = _name, \ 4317 .attrs = cm_counter_attrs_##_group, \ 4318 }; 4319 4320 CM_COUNTER_GROUP(CM_XMIT, "cm_tx_msgs") 4321 CM_COUNTER_GROUP(CM_XMIT_RETRIES, "cm_tx_retries") 4322 CM_COUNTER_GROUP(CM_RECV, "cm_rx_msgs") 4323 CM_COUNTER_GROUP(CM_RECV_DUPLICATES, "cm_rx_duplicates") 4324 4325 static const struct attribute_group *cm_counter_groups[] = { 4326 &cm_counter_group_CM_XMIT, 4327 &cm_counter_group_CM_XMIT_RETRIES, 4328 &cm_counter_group_CM_RECV, 4329 &cm_counter_group_CM_RECV_DUPLICATES, 4330 NULL, 4331 }; 4332 4333 static int cm_add_one(struct ib_device *ib_device) 4334 { 4335 struct cm_device *cm_dev; 4336 struct cm_port *port; 4337 struct ib_mad_reg_req reg_req = { 4338 .mgmt_class = IB_MGMT_CLASS_CM, 4339 .mgmt_class_version = IB_CM_CLASS_VERSION, 4340 }; 4341 struct ib_port_modify port_modify = { 4342 .set_port_cap_mask = IB_PORT_CM_SUP 4343 }; 4344 unsigned long flags; 4345 int ret; 4346 int count = 0; 4347 u32 i; 4348 4349 cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt), 4350 GFP_KERNEL); 4351 if (!cm_dev) 4352 return -ENOMEM; 4353 4354 kref_init(&cm_dev->kref); 4355 spin_lock_init(&cm_dev->mad_agent_lock); 4356 cm_dev->ib_device = ib_device; 4357 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay; 4358 cm_dev->going_down = 0; 4359 4360 ib_set_client_data(ib_device, &cm_client, cm_dev); 4361 4362 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 4363 rdma_for_each_port (ib_device, i) { 4364 if (!rdma_cap_ib_cm(ib_device, i)) 4365 continue; 4366 4367 port = kzalloc(sizeof *port, GFP_KERNEL); 4368 if (!port) { 4369 ret = -ENOMEM; 4370 goto error1; 4371 } 4372 4373 cm_dev->port[i-1] = port; 4374 port->cm_dev = cm_dev; 4375 port->port_num = i; 4376 4377 ret = ib_port_register_client_groups(ib_device, i, 4378 cm_counter_groups); 4379 if (ret) 4380 goto error1; 4381 4382 port->mad_agent = ib_register_mad_agent(ib_device, i, 4383 IB_QPT_GSI, 4384 ®_req, 4385 0, 4386 cm_send_handler, 4387 cm_recv_handler, 4388 port, 4389 0); 4390 if (IS_ERR(port->mad_agent)) { 4391 ret = PTR_ERR(port->mad_agent); 4392 goto error2; 4393 } 4394 4395 ret = ib_modify_port(ib_device, i, 0, &port_modify); 4396 if (ret) 4397 goto error3; 4398 4399 count++; 4400 } 4401 4402 if (!count) { 4403 ret = -EOPNOTSUPP; 4404 goto free; 4405 } 4406 4407 write_lock_irqsave(&cm.device_lock, flags); 4408 list_add_tail(&cm_dev->list, &cm.device_list); 4409 write_unlock_irqrestore(&cm.device_lock, flags); 4410 return 0; 4411 4412 error3: 4413 ib_unregister_mad_agent(port->mad_agent); 4414 error2: 4415 ib_port_unregister_client_groups(ib_device, i, cm_counter_groups); 4416 error1: 4417 port_modify.set_port_cap_mask = 0; 4418 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 4419 while (--i) { 4420 if (!rdma_cap_ib_cm(ib_device, i)) 4421 continue; 4422 4423 port = cm_dev->port[i-1]; 4424 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4425 ib_unregister_mad_agent(port->mad_agent); 4426 ib_port_unregister_client_groups(ib_device, i, 4427 cm_counter_groups); 4428 } 4429 free: 4430 cm_device_put(cm_dev); 4431 return ret; 4432 } 4433 4434 static void cm_remove_one(struct ib_device *ib_device, void *client_data) 4435 { 4436 struct cm_device *cm_dev = client_data; 4437 struct cm_port *port; 4438 struct ib_port_modify port_modify = { 4439 .clr_port_cap_mask = IB_PORT_CM_SUP 4440 }; 4441 unsigned long flags; 4442 u32 i; 4443 4444 write_lock_irqsave(&cm.device_lock, flags); 4445 list_del(&cm_dev->list); 4446 write_unlock_irqrestore(&cm.device_lock, flags); 4447 4448 spin_lock_irq(&cm.lock); 4449 cm_dev->going_down = 1; 4450 spin_unlock_irq(&cm.lock); 4451 4452 rdma_for_each_port (ib_device, i) { 4453 struct ib_mad_agent *mad_agent; 4454 4455 if (!rdma_cap_ib_cm(ib_device, i)) 4456 continue; 4457 4458 port = cm_dev->port[i-1]; 4459 mad_agent = port->mad_agent; 4460 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4461 /* 4462 * We flush the queue here after the going_down set, this 4463 * verify that no new works will be queued in the recv handler, 4464 * after that we can call the unregister_mad_agent 4465 */ 4466 flush_workqueue(cm.wq); 4467 /* 4468 * The above ensures no call paths from the work are running, 4469 * the remaining paths all take the mad_agent_lock. 4470 */ 4471 spin_lock(&cm_dev->mad_agent_lock); 4472 port->mad_agent = NULL; 4473 spin_unlock(&cm_dev->mad_agent_lock); 4474 ib_unregister_mad_agent(mad_agent); 4475 ib_port_unregister_client_groups(ib_device, i, 4476 cm_counter_groups); 4477 } 4478 4479 cm_device_put(cm_dev); 4480 } 4481 4482 static int __init ib_cm_init(void) 4483 { 4484 int ret; 4485 4486 INIT_LIST_HEAD(&cm.device_list); 4487 rwlock_init(&cm.device_lock); 4488 spin_lock_init(&cm.lock); 4489 cm.listen_service_table = RB_ROOT; 4490 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 4491 cm.remote_id_table = RB_ROOT; 4492 cm.remote_qp_table = RB_ROOT; 4493 cm.remote_sidr_table = RB_ROOT; 4494 xa_init_flags(&cm.local_id_table, XA_FLAGS_ALLOC); 4495 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 4496 INIT_LIST_HEAD(&cm.timewait_list); 4497 4498 cm.wq = alloc_workqueue("ib_cm", 0, 1); 4499 if (!cm.wq) { 4500 ret = -ENOMEM; 4501 goto error2; 4502 } 4503 4504 ret = ib_register_client(&cm_client); 4505 if (ret) 4506 goto error3; 4507 4508 return 0; 4509 error3: 4510 destroy_workqueue(cm.wq); 4511 error2: 4512 return ret; 4513 } 4514 4515 static void __exit ib_cm_cleanup(void) 4516 { 4517 struct cm_timewait_info *timewait_info, *tmp; 4518 4519 spin_lock_irq(&cm.lock); 4520 list_for_each_entry(timewait_info, &cm.timewait_list, list) 4521 cancel_delayed_work(&timewait_info->work.work); 4522 spin_unlock_irq(&cm.lock); 4523 4524 ib_unregister_client(&cm_client); 4525 destroy_workqueue(cm.wq); 4526 4527 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 4528 list_del(&timewait_info->list); 4529 kfree(timewait_info); 4530 } 4531 4532 WARN_ON(!xa_empty(&cm.local_id_table)); 4533 } 4534 4535 module_init(ib_cm_init); 4536 module_exit(ib_cm_cleanup); 4537