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 #define CM_DESTROY_ID_WAIT_TIMEOUT 10000 /* msecs */ 38 static const char * const ibcm_rej_reason_strs[] = { 39 [IB_CM_REJ_NO_QP] = "no QP", 40 [IB_CM_REJ_NO_EEC] = "no EEC", 41 [IB_CM_REJ_NO_RESOURCES] = "no resources", 42 [IB_CM_REJ_TIMEOUT] = "timeout", 43 [IB_CM_REJ_UNSUPPORTED] = "unsupported", 44 [IB_CM_REJ_INVALID_COMM_ID] = "invalid comm ID", 45 [IB_CM_REJ_INVALID_COMM_INSTANCE] = "invalid comm instance", 46 [IB_CM_REJ_INVALID_SERVICE_ID] = "invalid service ID", 47 [IB_CM_REJ_INVALID_TRANSPORT_TYPE] = "invalid transport type", 48 [IB_CM_REJ_STALE_CONN] = "stale conn", 49 [IB_CM_REJ_RDC_NOT_EXIST] = "RDC not exist", 50 [IB_CM_REJ_INVALID_GID] = "invalid GID", 51 [IB_CM_REJ_INVALID_LID] = "invalid LID", 52 [IB_CM_REJ_INVALID_SL] = "invalid SL", 53 [IB_CM_REJ_INVALID_TRAFFIC_CLASS] = "invalid traffic class", 54 [IB_CM_REJ_INVALID_HOP_LIMIT] = "invalid hop limit", 55 [IB_CM_REJ_INVALID_PACKET_RATE] = "invalid packet rate", 56 [IB_CM_REJ_INVALID_ALT_GID] = "invalid alt GID", 57 [IB_CM_REJ_INVALID_ALT_LID] = "invalid alt LID", 58 [IB_CM_REJ_INVALID_ALT_SL] = "invalid alt SL", 59 [IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS] = "invalid alt traffic class", 60 [IB_CM_REJ_INVALID_ALT_HOP_LIMIT] = "invalid alt hop limit", 61 [IB_CM_REJ_INVALID_ALT_PACKET_RATE] = "invalid alt packet rate", 62 [IB_CM_REJ_PORT_CM_REDIRECT] = "port CM redirect", 63 [IB_CM_REJ_PORT_REDIRECT] = "port redirect", 64 [IB_CM_REJ_INVALID_MTU] = "invalid MTU", 65 [IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES] = "insufficient resp resources", 66 [IB_CM_REJ_CONSUMER_DEFINED] = "consumer defined", 67 [IB_CM_REJ_INVALID_RNR_RETRY] = "invalid RNR retry", 68 [IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID] = "duplicate local comm ID", 69 [IB_CM_REJ_INVALID_CLASS_VERSION] = "invalid class version", 70 [IB_CM_REJ_INVALID_FLOW_LABEL] = "invalid flow label", 71 [IB_CM_REJ_INVALID_ALT_FLOW_LABEL] = "invalid alt flow label", 72 [IB_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED] = 73 "vendor option is not supported", 74 }; 75 76 const char *__attribute_const__ ibcm_reject_msg(int reason) 77 { 78 size_t index = reason; 79 80 if (index < ARRAY_SIZE(ibcm_rej_reason_strs) && 81 ibcm_rej_reason_strs[index]) 82 return ibcm_rej_reason_strs[index]; 83 else 84 return "unrecognized reason"; 85 } 86 EXPORT_SYMBOL(ibcm_reject_msg); 87 88 struct cm_id_private; 89 struct cm_work; 90 static int cm_add_one(struct ib_device *device); 91 static void cm_remove_one(struct ib_device *device, void *client_data); 92 static void cm_process_work(struct cm_id_private *cm_id_priv, 93 struct cm_work *work); 94 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv, 95 struct ib_cm_sidr_rep_param *param); 96 static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv, 97 const void *private_data, u8 private_data_len); 98 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv, 99 void *private_data, u8 private_data_len); 100 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv, 101 enum ib_cm_rej_reason reason, void *ari, 102 u8 ari_length, const void *private_data, 103 u8 private_data_len); 104 105 static struct ib_client cm_client = { 106 .name = "cm", 107 .add = cm_add_one, 108 .remove = cm_remove_one 109 }; 110 111 static struct ib_cm { 112 spinlock_t lock; 113 struct list_head device_list; 114 rwlock_t device_lock; 115 struct rb_root listen_service_table; 116 u64 listen_service_id; 117 /* struct rb_root peer_service_table; todo: fix peer to peer */ 118 struct rb_root remote_qp_table; 119 struct rb_root remote_id_table; 120 struct rb_root remote_sidr_table; 121 struct xarray local_id_table; 122 u32 local_id_next; 123 __be32 random_id_operand; 124 struct list_head timewait_list; 125 struct workqueue_struct *wq; 126 } cm; 127 128 /* Counter indexes ordered by attribute ID */ 129 enum { 130 CM_REQ_COUNTER, 131 CM_MRA_COUNTER, 132 CM_REJ_COUNTER, 133 CM_REP_COUNTER, 134 CM_RTU_COUNTER, 135 CM_DREQ_COUNTER, 136 CM_DREP_COUNTER, 137 CM_SIDR_REQ_COUNTER, 138 CM_SIDR_REP_COUNTER, 139 CM_LAP_COUNTER, 140 CM_APR_COUNTER, 141 CM_ATTR_COUNT, 142 CM_ATTR_ID_OFFSET = 0x0010, 143 }; 144 145 enum { 146 CM_XMIT, 147 CM_XMIT_RETRIES, 148 CM_RECV, 149 CM_RECV_DUPLICATES, 150 CM_COUNTER_GROUPS 151 }; 152 153 struct cm_counter_attribute { 154 struct ib_port_attribute attr; 155 unsigned short group; 156 unsigned short index; 157 }; 158 159 struct cm_port { 160 struct cm_device *cm_dev; 161 struct ib_mad_agent *mad_agent; 162 u32 port_num; 163 atomic_long_t counters[CM_COUNTER_GROUPS][CM_ATTR_COUNT]; 164 }; 165 166 struct cm_device { 167 struct kref kref; 168 struct list_head list; 169 spinlock_t mad_agent_lock; 170 struct ib_device *ib_device; 171 u8 ack_delay; 172 int going_down; 173 struct cm_port *port[]; 174 }; 175 176 struct cm_av { 177 struct cm_port *port; 178 struct rdma_ah_attr ah_attr; 179 u16 dlid_datapath; 180 u16 pkey_index; 181 u8 timeout; 182 }; 183 184 struct cm_work { 185 struct delayed_work work; 186 struct list_head list; 187 struct cm_port *port; 188 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 189 __be32 local_id; /* Established / timewait */ 190 __be32 remote_id; 191 struct ib_cm_event cm_event; 192 struct sa_path_rec path[]; 193 }; 194 195 struct cm_timewait_info { 196 struct cm_work work; 197 struct list_head list; 198 struct rb_node remote_qp_node; 199 struct rb_node remote_id_node; 200 __be64 remote_ca_guid; 201 __be32 remote_qpn; 202 u8 inserted_remote_qp; 203 u8 inserted_remote_id; 204 }; 205 206 struct cm_id_private { 207 struct ib_cm_id id; 208 209 struct rb_node service_node; 210 struct rb_node sidr_id_node; 211 u32 sidr_slid; 212 spinlock_t lock; /* Do not acquire inside cm.lock */ 213 struct completion comp; 214 refcount_t refcount; 215 /* Number of clients sharing this ib_cm_id. Only valid for listeners. 216 * Protected by the cm.lock spinlock. 217 */ 218 int listen_sharecount; 219 struct rcu_head rcu; 220 221 struct ib_mad_send_buf *msg; 222 struct cm_timewait_info *timewait_info; 223 /* todo: use alternate port on send failure */ 224 struct cm_av av; 225 struct cm_av alt_av; 226 227 void *private_data; 228 __be64 tid; 229 __be32 local_qpn; 230 __be32 remote_qpn; 231 enum ib_qp_type qp_type; 232 __be32 sq_psn; 233 __be32 rq_psn; 234 int timeout_ms; 235 enum ib_mtu path_mtu; 236 __be16 pkey; 237 u8 private_data_len; 238 u8 max_cm_retries; 239 u8 responder_resources; 240 u8 initiator_depth; 241 u8 retry_count; 242 u8 rnr_retry_count; 243 u8 service_timeout; 244 u8 target_ack_delay; 245 246 struct list_head work_list; 247 atomic_t work_count; 248 249 struct rdma_ucm_ece ece; 250 }; 251 252 static void cm_dev_release(struct kref *kref) 253 { 254 struct cm_device *cm_dev = container_of(kref, struct cm_device, kref); 255 u32 i; 256 257 rdma_for_each_port(cm_dev->ib_device, i) 258 kfree(cm_dev->port[i - 1]); 259 260 kfree(cm_dev); 261 } 262 263 static void cm_device_put(struct cm_device *cm_dev) 264 { 265 kref_put(&cm_dev->kref, cm_dev_release); 266 } 267 268 static void cm_work_handler(struct work_struct *work); 269 270 static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 271 { 272 if (refcount_dec_and_test(&cm_id_priv->refcount)) 273 complete(&cm_id_priv->comp); 274 } 275 276 static struct ib_mad_send_buf *cm_alloc_msg(struct cm_id_private *cm_id_priv) 277 { 278 struct ib_mad_agent *mad_agent; 279 struct ib_mad_send_buf *m; 280 struct ib_ah *ah; 281 282 lockdep_assert_held(&cm_id_priv->lock); 283 284 if (!cm_id_priv->av.port) 285 return ERR_PTR(-EINVAL); 286 287 spin_lock(&cm_id_priv->av.port->cm_dev->mad_agent_lock); 288 mad_agent = cm_id_priv->av.port->mad_agent; 289 if (!mad_agent) { 290 m = ERR_PTR(-EINVAL); 291 goto out; 292 } 293 294 ah = rdma_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr, 0); 295 if (IS_ERR(ah)) { 296 m = ERR_CAST(ah); 297 goto out; 298 } 299 300 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 301 cm_id_priv->av.pkey_index, 302 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 303 GFP_ATOMIC, 304 IB_MGMT_BASE_VERSION); 305 if (IS_ERR(m)) { 306 rdma_destroy_ah(ah, 0); 307 goto out; 308 } 309 310 /* Timeout set by caller if response is expected. */ 311 m->ah = ah; 312 m->retries = cm_id_priv->max_cm_retries; 313 314 refcount_inc(&cm_id_priv->refcount); 315 m->context[0] = cm_id_priv; 316 317 out: 318 spin_unlock(&cm_id_priv->av.port->cm_dev->mad_agent_lock); 319 return m; 320 } 321 322 static void cm_free_msg(struct ib_mad_send_buf *msg) 323 { 324 struct cm_id_private *cm_id_priv = msg->context[0]; 325 326 if (msg->ah) 327 rdma_destroy_ah(msg->ah, 0); 328 cm_deref_id(cm_id_priv); 329 ib_free_send_mad(msg); 330 } 331 332 static struct ib_mad_send_buf * 333 cm_alloc_priv_msg(struct cm_id_private *cm_id_priv) 334 { 335 struct ib_mad_send_buf *msg; 336 337 lockdep_assert_held(&cm_id_priv->lock); 338 339 msg = cm_alloc_msg(cm_id_priv); 340 if (IS_ERR(msg)) 341 return msg; 342 cm_id_priv->msg = msg; 343 return msg; 344 } 345 346 static void cm_free_priv_msg(struct ib_mad_send_buf *msg) 347 { 348 struct cm_id_private *cm_id_priv = msg->context[0]; 349 350 lockdep_assert_held(&cm_id_priv->lock); 351 352 if (!WARN_ON(cm_id_priv->msg != msg)) 353 cm_id_priv->msg = NULL; 354 355 if (msg->ah) 356 rdma_destroy_ah(msg->ah, 0); 357 cm_deref_id(cm_id_priv); 358 ib_free_send_mad(msg); 359 } 360 361 static struct ib_mad_send_buf *cm_alloc_response_msg_no_ah(struct cm_port *port, 362 struct ib_mad_recv_wc *mad_recv_wc) 363 { 364 return ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 365 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 366 GFP_ATOMIC, 367 IB_MGMT_BASE_VERSION); 368 } 369 370 static int cm_create_response_msg_ah(struct cm_port *port, 371 struct ib_mad_recv_wc *mad_recv_wc, 372 struct ib_mad_send_buf *msg) 373 { 374 struct ib_ah *ah; 375 376 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 377 mad_recv_wc->recv_buf.grh, port->port_num); 378 if (IS_ERR(ah)) 379 return PTR_ERR(ah); 380 381 msg->ah = ah; 382 return 0; 383 } 384 385 static int cm_alloc_response_msg(struct cm_port *port, 386 struct ib_mad_recv_wc *mad_recv_wc, 387 struct ib_mad_send_buf **msg) 388 { 389 struct ib_mad_send_buf *m; 390 int ret; 391 392 m = cm_alloc_response_msg_no_ah(port, mad_recv_wc); 393 if (IS_ERR(m)) 394 return PTR_ERR(m); 395 396 ret = cm_create_response_msg_ah(port, mad_recv_wc, m); 397 if (ret) { 398 ib_free_send_mad(m); 399 return ret; 400 } 401 402 *msg = m; 403 return 0; 404 } 405 406 static void cm_free_response_msg(struct ib_mad_send_buf *msg) 407 { 408 if (msg->ah) 409 rdma_destroy_ah(msg->ah, 0); 410 ib_free_send_mad(msg); 411 } 412 413 static void *cm_copy_private_data(const void *private_data, u8 private_data_len) 414 { 415 void *data; 416 417 if (!private_data || !private_data_len) 418 return NULL; 419 420 data = kmemdup(private_data, private_data_len, GFP_KERNEL); 421 if (!data) 422 return ERR_PTR(-ENOMEM); 423 424 return data; 425 } 426 427 static void cm_set_private_data(struct cm_id_private *cm_id_priv, 428 void *private_data, u8 private_data_len) 429 { 430 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 431 kfree(cm_id_priv->private_data); 432 433 cm_id_priv->private_data = private_data; 434 cm_id_priv->private_data_len = private_data_len; 435 } 436 437 static void cm_set_av_port(struct cm_av *av, struct cm_port *port) 438 { 439 struct cm_port *old_port = av->port; 440 441 if (old_port == port) 442 return; 443 444 av->port = port; 445 if (old_port) 446 cm_device_put(old_port->cm_dev); 447 if (port) 448 kref_get(&port->cm_dev->kref); 449 } 450 451 static void cm_init_av_for_lap(struct cm_port *port, struct ib_wc *wc, 452 struct rdma_ah_attr *ah_attr, struct cm_av *av) 453 { 454 cm_set_av_port(av, port); 455 av->pkey_index = wc->pkey_index; 456 rdma_move_ah_attr(&av->ah_attr, ah_attr); 457 } 458 459 static int cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 460 struct ib_grh *grh, struct cm_av *av) 461 { 462 cm_set_av_port(av, port); 463 av->pkey_index = wc->pkey_index; 464 return ib_init_ah_attr_from_wc(port->cm_dev->ib_device, 465 port->port_num, wc, 466 grh, &av->ah_attr); 467 } 468 469 static struct cm_port * 470 get_cm_port_from_path(struct sa_path_rec *path, const struct ib_gid_attr *attr) 471 { 472 struct cm_device *cm_dev; 473 struct cm_port *port = NULL; 474 unsigned long flags; 475 476 if (attr) { 477 read_lock_irqsave(&cm.device_lock, flags); 478 list_for_each_entry(cm_dev, &cm.device_list, list) { 479 if (cm_dev->ib_device == attr->device) { 480 port = cm_dev->port[attr->port_num - 1]; 481 break; 482 } 483 } 484 read_unlock_irqrestore(&cm.device_lock, flags); 485 } else { 486 /* SGID attribute can be NULL in following 487 * conditions. 488 * (a) Alternative path 489 * (b) IB link layer without GRH 490 * (c) LAP send messages 491 */ 492 read_lock_irqsave(&cm.device_lock, flags); 493 list_for_each_entry(cm_dev, &cm.device_list, list) { 494 attr = rdma_find_gid(cm_dev->ib_device, 495 &path->sgid, 496 sa_conv_pathrec_to_gid_type(path), 497 NULL); 498 if (!IS_ERR(attr)) { 499 port = cm_dev->port[attr->port_num - 1]; 500 break; 501 } 502 } 503 read_unlock_irqrestore(&cm.device_lock, flags); 504 if (port) 505 rdma_put_gid_attr(attr); 506 } 507 return port; 508 } 509 510 static int cm_init_av_by_path(struct sa_path_rec *path, 511 const struct ib_gid_attr *sgid_attr, 512 struct cm_av *av) 513 { 514 struct rdma_ah_attr new_ah_attr; 515 struct cm_device *cm_dev; 516 struct cm_port *port; 517 int ret; 518 519 port = get_cm_port_from_path(path, sgid_attr); 520 if (!port) 521 return -EINVAL; 522 cm_dev = port->cm_dev; 523 524 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num, 525 be16_to_cpu(path->pkey), &av->pkey_index); 526 if (ret) 527 return ret; 528 529 cm_set_av_port(av, port); 530 531 /* 532 * av->ah_attr might be initialized based on wc or during 533 * request processing time which might have reference to sgid_attr. 534 * So initialize a new ah_attr on stack. 535 * If initialization fails, old ah_attr is used for sending any 536 * responses. If initialization is successful, than new ah_attr 537 * is used by overwriting the old one. So that right ah_attr 538 * can be used to return an error response. 539 */ 540 ret = ib_init_ah_attr_from_path(cm_dev->ib_device, port->port_num, path, 541 &new_ah_attr, sgid_attr); 542 if (ret) 543 return ret; 544 545 av->timeout = path->packet_life_time + 1; 546 rdma_move_ah_attr(&av->ah_attr, &new_ah_attr); 547 return 0; 548 } 549 550 /* Move av created by cm_init_av_by_path(), so av.dgid is not moved */ 551 static void cm_move_av_from_path(struct cm_av *dest, struct cm_av *src) 552 { 553 cm_set_av_port(dest, src->port); 554 cm_set_av_port(src, NULL); 555 dest->pkey_index = src->pkey_index; 556 rdma_move_ah_attr(&dest->ah_attr, &src->ah_attr); 557 dest->timeout = src->timeout; 558 } 559 560 static void cm_destroy_av(struct cm_av *av) 561 { 562 rdma_destroy_ah_attr(&av->ah_attr); 563 cm_set_av_port(av, NULL); 564 } 565 566 static u32 cm_local_id(__be32 local_id) 567 { 568 return (__force u32) (local_id ^ cm.random_id_operand); 569 } 570 571 static struct cm_id_private *cm_acquire_id(__be32 local_id, __be32 remote_id) 572 { 573 struct cm_id_private *cm_id_priv; 574 575 rcu_read_lock(); 576 cm_id_priv = xa_load(&cm.local_id_table, cm_local_id(local_id)); 577 if (!cm_id_priv || cm_id_priv->id.remote_id != remote_id || 578 !refcount_inc_not_zero(&cm_id_priv->refcount)) 579 cm_id_priv = NULL; 580 rcu_read_unlock(); 581 582 return cm_id_priv; 583 } 584 585 /* 586 * Trivial helpers to strip endian annotation and compare; the 587 * endianness doesn't actually matter since we just need a stable 588 * order for the RB tree. 589 */ 590 static int be32_lt(__be32 a, __be32 b) 591 { 592 return (__force u32) a < (__force u32) b; 593 } 594 595 static int be32_gt(__be32 a, __be32 b) 596 { 597 return (__force u32) a > (__force u32) b; 598 } 599 600 static int be64_lt(__be64 a, __be64 b) 601 { 602 return (__force u64) a < (__force u64) b; 603 } 604 605 static int be64_gt(__be64 a, __be64 b) 606 { 607 return (__force u64) a > (__force u64) b; 608 } 609 610 /* 611 * Inserts a new cm_id_priv into the listen_service_table. Returns cm_id_priv 612 * if the new ID was inserted, NULL if it could not be inserted due to a 613 * collision, or the existing cm_id_priv ready for shared usage. 614 */ 615 static struct cm_id_private *cm_insert_listen(struct cm_id_private *cm_id_priv, 616 ib_cm_handler shared_handler) 617 { 618 struct rb_node **link = &cm.listen_service_table.rb_node; 619 struct rb_node *parent = NULL; 620 struct cm_id_private *cur_cm_id_priv; 621 __be64 service_id = cm_id_priv->id.service_id; 622 unsigned long flags; 623 624 spin_lock_irqsave(&cm.lock, flags); 625 while (*link) { 626 parent = *link; 627 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 628 service_node); 629 630 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 631 link = &(*link)->rb_left; 632 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 633 link = &(*link)->rb_right; 634 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id)) 635 link = &(*link)->rb_left; 636 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id)) 637 link = &(*link)->rb_right; 638 else { 639 /* 640 * Sharing an ib_cm_id with different handlers is not 641 * supported 642 */ 643 if (cur_cm_id_priv->id.cm_handler != shared_handler || 644 cur_cm_id_priv->id.context || 645 WARN_ON(!cur_cm_id_priv->id.cm_handler)) { 646 spin_unlock_irqrestore(&cm.lock, flags); 647 return NULL; 648 } 649 refcount_inc(&cur_cm_id_priv->refcount); 650 cur_cm_id_priv->listen_sharecount++; 651 spin_unlock_irqrestore(&cm.lock, flags); 652 return cur_cm_id_priv; 653 } 654 } 655 cm_id_priv->listen_sharecount++; 656 rb_link_node(&cm_id_priv->service_node, parent, link); 657 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 658 spin_unlock_irqrestore(&cm.lock, flags); 659 return cm_id_priv; 660 } 661 662 static struct cm_id_private *cm_find_listen(struct ib_device *device, 663 __be64 service_id) 664 { 665 struct rb_node *node = cm.listen_service_table.rb_node; 666 struct cm_id_private *cm_id_priv; 667 668 while (node) { 669 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 670 671 if (device < cm_id_priv->id.device) 672 node = node->rb_left; 673 else if (device > cm_id_priv->id.device) 674 node = node->rb_right; 675 else if (be64_lt(service_id, cm_id_priv->id.service_id)) 676 node = node->rb_left; 677 else if (be64_gt(service_id, cm_id_priv->id.service_id)) 678 node = node->rb_right; 679 else { 680 refcount_inc(&cm_id_priv->refcount); 681 return cm_id_priv; 682 } 683 } 684 return NULL; 685 } 686 687 static struct cm_timewait_info * 688 cm_insert_remote_id(struct cm_timewait_info *timewait_info) 689 { 690 struct rb_node **link = &cm.remote_id_table.rb_node; 691 struct rb_node *parent = NULL; 692 struct cm_timewait_info *cur_timewait_info; 693 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 694 __be32 remote_id = timewait_info->work.remote_id; 695 696 while (*link) { 697 parent = *link; 698 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 699 remote_id_node); 700 if (be32_lt(remote_id, cur_timewait_info->work.remote_id)) 701 link = &(*link)->rb_left; 702 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id)) 703 link = &(*link)->rb_right; 704 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 705 link = &(*link)->rb_left; 706 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 707 link = &(*link)->rb_right; 708 else 709 return cur_timewait_info; 710 } 711 timewait_info->inserted_remote_id = 1; 712 rb_link_node(&timewait_info->remote_id_node, parent, link); 713 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 714 return NULL; 715 } 716 717 static struct cm_id_private *cm_find_remote_id(__be64 remote_ca_guid, 718 __be32 remote_id) 719 { 720 struct rb_node *node = cm.remote_id_table.rb_node; 721 struct cm_timewait_info *timewait_info; 722 struct cm_id_private *res = NULL; 723 724 spin_lock_irq(&cm.lock); 725 while (node) { 726 timewait_info = rb_entry(node, struct cm_timewait_info, 727 remote_id_node); 728 if (be32_lt(remote_id, timewait_info->work.remote_id)) 729 node = node->rb_left; 730 else if (be32_gt(remote_id, timewait_info->work.remote_id)) 731 node = node->rb_right; 732 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid)) 733 node = node->rb_left; 734 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid)) 735 node = node->rb_right; 736 else { 737 res = cm_acquire_id(timewait_info->work.local_id, 738 timewait_info->work.remote_id); 739 break; 740 } 741 } 742 spin_unlock_irq(&cm.lock); 743 return res; 744 } 745 746 static struct cm_timewait_info * 747 cm_insert_remote_qpn(struct cm_timewait_info *timewait_info) 748 { 749 struct rb_node **link = &cm.remote_qp_table.rb_node; 750 struct rb_node *parent = NULL; 751 struct cm_timewait_info *cur_timewait_info; 752 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 753 __be32 remote_qpn = timewait_info->remote_qpn; 754 755 while (*link) { 756 parent = *link; 757 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 758 remote_qp_node); 759 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn)) 760 link = &(*link)->rb_left; 761 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn)) 762 link = &(*link)->rb_right; 763 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 764 link = &(*link)->rb_left; 765 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 766 link = &(*link)->rb_right; 767 else 768 return cur_timewait_info; 769 } 770 timewait_info->inserted_remote_qp = 1; 771 rb_link_node(&timewait_info->remote_qp_node, parent, link); 772 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 773 return NULL; 774 } 775 776 static struct cm_id_private * 777 cm_insert_remote_sidr(struct cm_id_private *cm_id_priv) 778 { 779 struct rb_node **link = &cm.remote_sidr_table.rb_node; 780 struct rb_node *parent = NULL; 781 struct cm_id_private *cur_cm_id_priv; 782 __be32 remote_id = cm_id_priv->id.remote_id; 783 784 while (*link) { 785 parent = *link; 786 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 787 sidr_id_node); 788 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id)) 789 link = &(*link)->rb_left; 790 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id)) 791 link = &(*link)->rb_right; 792 else { 793 if (cur_cm_id_priv->sidr_slid < cm_id_priv->sidr_slid) 794 link = &(*link)->rb_left; 795 else if (cur_cm_id_priv->sidr_slid > cm_id_priv->sidr_slid) 796 link = &(*link)->rb_right; 797 else 798 return cur_cm_id_priv; 799 } 800 } 801 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 802 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 803 return NULL; 804 } 805 806 static struct cm_id_private *cm_alloc_id_priv(struct ib_device *device, 807 ib_cm_handler cm_handler, 808 void *context) 809 { 810 struct cm_id_private *cm_id_priv; 811 u32 id; 812 int ret; 813 814 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 815 if (!cm_id_priv) 816 return ERR_PTR(-ENOMEM); 817 818 cm_id_priv->id.state = IB_CM_IDLE; 819 cm_id_priv->id.device = device; 820 cm_id_priv->id.cm_handler = cm_handler; 821 cm_id_priv->id.context = context; 822 cm_id_priv->id.remote_cm_qpn = 1; 823 824 RB_CLEAR_NODE(&cm_id_priv->service_node); 825 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); 826 spin_lock_init(&cm_id_priv->lock); 827 init_completion(&cm_id_priv->comp); 828 INIT_LIST_HEAD(&cm_id_priv->work_list); 829 atomic_set(&cm_id_priv->work_count, -1); 830 refcount_set(&cm_id_priv->refcount, 1); 831 832 ret = xa_alloc_cyclic(&cm.local_id_table, &id, NULL, xa_limit_32b, 833 &cm.local_id_next, GFP_KERNEL); 834 if (ret < 0) 835 goto error; 836 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand; 837 838 return cm_id_priv; 839 840 error: 841 kfree(cm_id_priv); 842 return ERR_PTR(ret); 843 } 844 845 /* 846 * Make the ID visible to the MAD handlers and other threads that use the 847 * xarray. 848 */ 849 static void cm_finalize_id(struct cm_id_private *cm_id_priv) 850 { 851 xa_store(&cm.local_id_table, cm_local_id(cm_id_priv->id.local_id), 852 cm_id_priv, GFP_ATOMIC); 853 } 854 855 struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 856 ib_cm_handler cm_handler, 857 void *context) 858 { 859 struct cm_id_private *cm_id_priv; 860 861 cm_id_priv = cm_alloc_id_priv(device, cm_handler, context); 862 if (IS_ERR(cm_id_priv)) 863 return ERR_CAST(cm_id_priv); 864 865 cm_finalize_id(cm_id_priv); 866 return &cm_id_priv->id; 867 } 868 EXPORT_SYMBOL(ib_create_cm_id); 869 870 static struct cm_work *cm_dequeue_work(struct cm_id_private *cm_id_priv) 871 { 872 struct cm_work *work; 873 874 if (list_empty(&cm_id_priv->work_list)) 875 return NULL; 876 877 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 878 list_del(&work->list); 879 return work; 880 } 881 882 static void cm_free_work(struct cm_work *work) 883 { 884 if (work->mad_recv_wc) 885 ib_free_recv_mad(work->mad_recv_wc); 886 kfree(work); 887 } 888 889 static void cm_queue_work_unlock(struct cm_id_private *cm_id_priv, 890 struct cm_work *work) 891 __releases(&cm_id_priv->lock) 892 { 893 bool immediate; 894 895 /* 896 * To deliver the event to the user callback we have the drop the 897 * spinlock, however, we need to ensure that the user callback is single 898 * threaded and receives events in the temporal order. If there are 899 * already events being processed then thread new events onto a list, 900 * the thread currently processing will pick them up. 901 */ 902 immediate = atomic_inc_and_test(&cm_id_priv->work_count); 903 if (!immediate) { 904 list_add_tail(&work->list, &cm_id_priv->work_list); 905 /* 906 * This routine always consumes incoming reference. Once queued 907 * to the work_list then a reference is held by the thread 908 * currently running cm_process_work() and this reference is not 909 * needed. 910 */ 911 cm_deref_id(cm_id_priv); 912 } 913 spin_unlock_irq(&cm_id_priv->lock); 914 915 if (immediate) 916 cm_process_work(cm_id_priv, work); 917 } 918 919 static inline int cm_convert_to_ms(int iba_time) 920 { 921 /* approximate conversion to ms from 4.096us x 2^iba_time */ 922 return 1 << max(iba_time - 8, 0); 923 } 924 925 /* 926 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 927 * Because of how ack_timeout is stored, adding one doubles the timeout. 928 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 929 * increment it (round up) only if the other is within 50%. 930 */ 931 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 932 { 933 int ack_timeout = packet_life_time + 1; 934 935 if (ack_timeout >= ca_ack_delay) 936 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 937 else 938 ack_timeout = ca_ack_delay + 939 (ack_timeout >= (ca_ack_delay - 1)); 940 941 return min(31, ack_timeout); 942 } 943 944 static void cm_remove_remote(struct cm_id_private *cm_id_priv) 945 { 946 struct cm_timewait_info *timewait_info = cm_id_priv->timewait_info; 947 948 if (timewait_info->inserted_remote_id) { 949 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 950 timewait_info->inserted_remote_id = 0; 951 } 952 953 if (timewait_info->inserted_remote_qp) { 954 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 955 timewait_info->inserted_remote_qp = 0; 956 } 957 } 958 959 static struct cm_timewait_info *cm_create_timewait_info(__be32 local_id) 960 { 961 struct cm_timewait_info *timewait_info; 962 963 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 964 if (!timewait_info) 965 return ERR_PTR(-ENOMEM); 966 967 timewait_info->work.local_id = local_id; 968 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 969 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 970 return timewait_info; 971 } 972 973 static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 974 { 975 int wait_time; 976 unsigned long flags; 977 struct cm_device *cm_dev; 978 979 lockdep_assert_held(&cm_id_priv->lock); 980 981 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client); 982 if (!cm_dev) 983 return; 984 985 spin_lock_irqsave(&cm.lock, flags); 986 cm_remove_remote(cm_id_priv); 987 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 988 spin_unlock_irqrestore(&cm.lock, flags); 989 990 /* 991 * The cm_id could be destroyed by the user before we exit timewait. 992 * To protect against this, we search for the cm_id after exiting 993 * timewait before notifying the user that we've exited timewait. 994 */ 995 cm_id_priv->id.state = IB_CM_TIMEWAIT; 996 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 997 998 /* Check if the device started its remove_one */ 999 spin_lock_irqsave(&cm.lock, flags); 1000 if (!cm_dev->going_down) 1001 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 1002 msecs_to_jiffies(wait_time)); 1003 spin_unlock_irqrestore(&cm.lock, flags); 1004 1005 /* 1006 * The timewait_info is converted into a work and gets freed during 1007 * cm_free_work() in cm_timewait_handler(). 1008 */ 1009 BUILD_BUG_ON(offsetof(struct cm_timewait_info, work) != 0); 1010 cm_id_priv->timewait_info = NULL; 1011 } 1012 1013 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 1014 { 1015 unsigned long flags; 1016 1017 lockdep_assert_held(&cm_id_priv->lock); 1018 1019 cm_id_priv->id.state = IB_CM_IDLE; 1020 if (cm_id_priv->timewait_info) { 1021 spin_lock_irqsave(&cm.lock, flags); 1022 cm_remove_remote(cm_id_priv); 1023 spin_unlock_irqrestore(&cm.lock, flags); 1024 kfree(cm_id_priv->timewait_info); 1025 cm_id_priv->timewait_info = NULL; 1026 } 1027 } 1028 1029 static noinline void cm_destroy_id_wait_timeout(struct ib_cm_id *cm_id, 1030 enum ib_cm_state old_state) 1031 { 1032 struct cm_id_private *cm_id_priv; 1033 1034 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1035 pr_err("%s: cm_id=%p timed out. state %d -> %d, refcnt=%d\n", __func__, 1036 cm_id, old_state, cm_id->state, refcount_read(&cm_id_priv->refcount)); 1037 } 1038 1039 static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 1040 { 1041 struct cm_id_private *cm_id_priv; 1042 enum ib_cm_state old_state; 1043 struct cm_work *work; 1044 int ret; 1045 1046 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1047 spin_lock_irq(&cm_id_priv->lock); 1048 old_state = cm_id->state; 1049 retest: 1050 switch (cm_id->state) { 1051 case IB_CM_LISTEN: 1052 spin_lock(&cm.lock); 1053 if (--cm_id_priv->listen_sharecount > 0) { 1054 /* The id is still shared. */ 1055 WARN_ON(refcount_read(&cm_id_priv->refcount) == 1); 1056 spin_unlock(&cm.lock); 1057 spin_unlock_irq(&cm_id_priv->lock); 1058 cm_deref_id(cm_id_priv); 1059 return; 1060 } 1061 cm_id->state = IB_CM_IDLE; 1062 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 1063 RB_CLEAR_NODE(&cm_id_priv->service_node); 1064 spin_unlock(&cm.lock); 1065 break; 1066 case IB_CM_SIDR_REQ_SENT: 1067 cm_id->state = IB_CM_IDLE; 1068 ib_cancel_mad(cm_id_priv->msg); 1069 break; 1070 case IB_CM_SIDR_REQ_RCVD: 1071 cm_send_sidr_rep_locked(cm_id_priv, 1072 &(struct ib_cm_sidr_rep_param){ 1073 .status = IB_SIDR_REJECT }); 1074 /* cm_send_sidr_rep_locked will not move to IDLE if it fails */ 1075 cm_id->state = IB_CM_IDLE; 1076 break; 1077 case IB_CM_REQ_SENT: 1078 case IB_CM_MRA_REQ_RCVD: 1079 ib_cancel_mad(cm_id_priv->msg); 1080 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_TIMEOUT, 1081 &cm_id_priv->id.device->node_guid, 1082 sizeof(cm_id_priv->id.device->node_guid), 1083 NULL, 0); 1084 break; 1085 case IB_CM_REQ_RCVD: 1086 if (err == -ENOMEM) { 1087 /* Do not reject to allow future retries. */ 1088 cm_reset_to_idle(cm_id_priv); 1089 } else { 1090 cm_send_rej_locked(cm_id_priv, 1091 IB_CM_REJ_CONSUMER_DEFINED, NULL, 0, 1092 NULL, 0); 1093 } 1094 break; 1095 case IB_CM_REP_SENT: 1096 case IB_CM_MRA_REP_RCVD: 1097 ib_cancel_mad(cm_id_priv->msg); 1098 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL, 1099 0, NULL, 0); 1100 goto retest; 1101 case IB_CM_MRA_REQ_SENT: 1102 case IB_CM_REP_RCVD: 1103 case IB_CM_MRA_REP_SENT: 1104 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL, 1105 0, NULL, 0); 1106 break; 1107 case IB_CM_ESTABLISHED: 1108 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 1109 cm_id->state = IB_CM_IDLE; 1110 break; 1111 } 1112 cm_send_dreq_locked(cm_id_priv, NULL, 0); 1113 goto retest; 1114 case IB_CM_DREQ_SENT: 1115 ib_cancel_mad(cm_id_priv->msg); 1116 cm_enter_timewait(cm_id_priv); 1117 goto retest; 1118 case IB_CM_DREQ_RCVD: 1119 cm_send_drep_locked(cm_id_priv, NULL, 0); 1120 WARN_ON(cm_id->state != IB_CM_TIMEWAIT); 1121 goto retest; 1122 case IB_CM_TIMEWAIT: 1123 /* 1124 * The cm_acquire_id in cm_timewait_handler will stop working 1125 * once we do xa_erase below, so just move to idle here for 1126 * consistency. 1127 */ 1128 cm_id->state = IB_CM_IDLE; 1129 break; 1130 case IB_CM_IDLE: 1131 break; 1132 } 1133 WARN_ON(cm_id->state != IB_CM_IDLE); 1134 1135 spin_lock(&cm.lock); 1136 /* Required for cleanup paths related cm_req_handler() */ 1137 if (cm_id_priv->timewait_info) { 1138 cm_remove_remote(cm_id_priv); 1139 kfree(cm_id_priv->timewait_info); 1140 cm_id_priv->timewait_info = NULL; 1141 } 1142 1143 WARN_ON(cm_id_priv->listen_sharecount); 1144 WARN_ON(!RB_EMPTY_NODE(&cm_id_priv->service_node)); 1145 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) 1146 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 1147 spin_unlock(&cm.lock); 1148 spin_unlock_irq(&cm_id_priv->lock); 1149 1150 xa_erase(&cm.local_id_table, cm_local_id(cm_id->local_id)); 1151 cm_deref_id(cm_id_priv); 1152 do { 1153 ret = wait_for_completion_timeout(&cm_id_priv->comp, 1154 msecs_to_jiffies( 1155 CM_DESTROY_ID_WAIT_TIMEOUT)); 1156 if (!ret) /* timeout happened */ 1157 cm_destroy_id_wait_timeout(cm_id, old_state); 1158 } while (!ret); 1159 1160 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 1161 cm_free_work(work); 1162 1163 cm_destroy_av(&cm_id_priv->av); 1164 cm_destroy_av(&cm_id_priv->alt_av); 1165 kfree(cm_id_priv->private_data); 1166 kfree_rcu(cm_id_priv, rcu); 1167 } 1168 1169 void ib_destroy_cm_id(struct ib_cm_id *cm_id) 1170 { 1171 cm_destroy_id(cm_id, 0); 1172 } 1173 EXPORT_SYMBOL(ib_destroy_cm_id); 1174 1175 static int cm_init_listen(struct cm_id_private *cm_id_priv, __be64 service_id) 1176 { 1177 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 1178 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 1179 return -EINVAL; 1180 1181 if (service_id == IB_CM_ASSIGN_SERVICE_ID) 1182 cm_id_priv->id.service_id = cpu_to_be64(cm.listen_service_id++); 1183 else 1184 cm_id_priv->id.service_id = service_id; 1185 1186 return 0; 1187 } 1188 1189 /** 1190 * ib_cm_listen - Initiates listening on the specified service ID for 1191 * connection and service ID resolution requests. 1192 * @cm_id: Connection identifier associated with the listen request. 1193 * @service_id: Service identifier matched against incoming connection 1194 * and service ID resolution requests. The service ID should be specified 1195 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1196 * assign a service ID to the caller. 1197 */ 1198 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id) 1199 { 1200 struct cm_id_private *cm_id_priv = 1201 container_of(cm_id, struct cm_id_private, id); 1202 unsigned long flags; 1203 int ret; 1204 1205 spin_lock_irqsave(&cm_id_priv->lock, flags); 1206 if (cm_id_priv->id.state != IB_CM_IDLE) { 1207 ret = -EINVAL; 1208 goto out; 1209 } 1210 1211 ret = cm_init_listen(cm_id_priv, service_id); 1212 if (ret) 1213 goto out; 1214 1215 if (!cm_insert_listen(cm_id_priv, NULL)) { 1216 ret = -EBUSY; 1217 goto out; 1218 } 1219 1220 cm_id_priv->id.state = IB_CM_LISTEN; 1221 ret = 0; 1222 1223 out: 1224 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1225 return ret; 1226 } 1227 EXPORT_SYMBOL(ib_cm_listen); 1228 1229 /** 1230 * ib_cm_insert_listen - Create a new listening ib_cm_id and listen on 1231 * the given service ID. 1232 * 1233 * If there's an existing ID listening on that same device and service ID, 1234 * return it. 1235 * 1236 * @device: Device associated with the cm_id. All related communication will 1237 * be associated with the specified device. 1238 * @cm_handler: Callback invoked to notify the user of CM events. 1239 * @service_id: Service identifier matched against incoming connection 1240 * and service ID resolution requests. The service ID should be specified 1241 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1242 * assign a service ID to the caller. 1243 * 1244 * Callers should call ib_destroy_cm_id when done with the listener ID. 1245 */ 1246 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device, 1247 ib_cm_handler cm_handler, 1248 __be64 service_id) 1249 { 1250 struct cm_id_private *listen_id_priv; 1251 struct cm_id_private *cm_id_priv; 1252 int err = 0; 1253 1254 /* Create an ID in advance, since the creation may sleep */ 1255 cm_id_priv = cm_alloc_id_priv(device, cm_handler, NULL); 1256 if (IS_ERR(cm_id_priv)) 1257 return ERR_CAST(cm_id_priv); 1258 1259 err = cm_init_listen(cm_id_priv, service_id); 1260 if (err) { 1261 ib_destroy_cm_id(&cm_id_priv->id); 1262 return ERR_PTR(err); 1263 } 1264 1265 spin_lock_irq(&cm_id_priv->lock); 1266 listen_id_priv = cm_insert_listen(cm_id_priv, cm_handler); 1267 if (listen_id_priv != cm_id_priv) { 1268 spin_unlock_irq(&cm_id_priv->lock); 1269 ib_destroy_cm_id(&cm_id_priv->id); 1270 if (!listen_id_priv) 1271 return ERR_PTR(-EINVAL); 1272 return &listen_id_priv->id; 1273 } 1274 cm_id_priv->id.state = IB_CM_LISTEN; 1275 spin_unlock_irq(&cm_id_priv->lock); 1276 1277 /* 1278 * A listen ID does not need to be in the xarray since it does not 1279 * receive mads, is not placed in the remote_id or remote_qpn rbtree, 1280 * and does not enter timewait. 1281 */ 1282 1283 return &cm_id_priv->id; 1284 } 1285 EXPORT_SYMBOL(ib_cm_insert_listen); 1286 1287 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv) 1288 { 1289 u64 hi_tid = 0, low_tid; 1290 1291 lockdep_assert_held(&cm_id_priv->lock); 1292 1293 low_tid = (u64)cm_id_priv->id.local_id; 1294 if (!cm_id_priv->av.port) 1295 return cpu_to_be64(low_tid); 1296 1297 spin_lock(&cm_id_priv->av.port->cm_dev->mad_agent_lock); 1298 if (cm_id_priv->av.port->mad_agent) 1299 hi_tid = ((u64)cm_id_priv->av.port->mad_agent->hi_tid) << 32; 1300 spin_unlock(&cm_id_priv->av.port->cm_dev->mad_agent_lock); 1301 return cpu_to_be64(hi_tid | low_tid); 1302 } 1303 1304 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 1305 __be16 attr_id, __be64 tid) 1306 { 1307 hdr->base_version = IB_MGMT_BASE_VERSION; 1308 hdr->mgmt_class = IB_MGMT_CLASS_CM; 1309 hdr->class_version = IB_CM_CLASS_VERSION; 1310 hdr->method = IB_MGMT_METHOD_SEND; 1311 hdr->attr_id = attr_id; 1312 hdr->tid = tid; 1313 } 1314 1315 static void cm_format_mad_ece_hdr(struct ib_mad_hdr *hdr, __be16 attr_id, 1316 __be64 tid, u32 attr_mod) 1317 { 1318 cm_format_mad_hdr(hdr, attr_id, tid); 1319 hdr->attr_mod = cpu_to_be32(attr_mod); 1320 } 1321 1322 static void cm_format_req(struct cm_req_msg *req_msg, 1323 struct cm_id_private *cm_id_priv, 1324 struct ib_cm_req_param *param) 1325 { 1326 struct sa_path_rec *pri_path = param->primary_path; 1327 struct sa_path_rec *alt_path = param->alternate_path; 1328 bool pri_ext = false; 1329 __be16 lid; 1330 1331 if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA) 1332 pri_ext = opa_is_extended_lid(pri_path->opa.dlid, 1333 pri_path->opa.slid); 1334 1335 cm_format_mad_ece_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1336 cm_form_tid(cm_id_priv), param->ece.attr_mod); 1337 1338 IBA_SET(CM_REQ_LOCAL_COMM_ID, req_msg, 1339 be32_to_cpu(cm_id_priv->id.local_id)); 1340 IBA_SET(CM_REQ_SERVICE_ID, req_msg, be64_to_cpu(param->service_id)); 1341 IBA_SET(CM_REQ_LOCAL_CA_GUID, req_msg, 1342 be64_to_cpu(cm_id_priv->id.device->node_guid)); 1343 IBA_SET(CM_REQ_LOCAL_QPN, req_msg, param->qp_num); 1344 IBA_SET(CM_REQ_INITIATOR_DEPTH, req_msg, param->initiator_depth); 1345 IBA_SET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg, 1346 param->remote_cm_response_timeout); 1347 cm_req_set_qp_type(req_msg, param->qp_type); 1348 IBA_SET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg, param->flow_control); 1349 IBA_SET(CM_REQ_STARTING_PSN, req_msg, param->starting_psn); 1350 IBA_SET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg, 1351 param->local_cm_response_timeout); 1352 IBA_SET(CM_REQ_PARTITION_KEY, req_msg, 1353 be16_to_cpu(param->primary_path->pkey)); 1354 IBA_SET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg, 1355 param->primary_path->mtu); 1356 IBA_SET(CM_REQ_MAX_CM_RETRIES, req_msg, param->max_cm_retries); 1357 1358 if (param->qp_type != IB_QPT_XRC_INI) { 1359 IBA_SET(CM_REQ_RESPONDER_RESOURCES, req_msg, 1360 param->responder_resources); 1361 IBA_SET(CM_REQ_RETRY_COUNT, req_msg, param->retry_count); 1362 IBA_SET(CM_REQ_RNR_RETRY_COUNT, req_msg, 1363 param->rnr_retry_count); 1364 IBA_SET(CM_REQ_SRQ, req_msg, param->srq); 1365 } 1366 1367 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) = 1368 pri_path->sgid; 1369 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) = 1370 pri_path->dgid; 1371 if (pri_ext) { 1372 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) 1373 ->global.interface_id = 1374 OPA_MAKE_ID(be32_to_cpu(pri_path->opa.slid)); 1375 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) 1376 ->global.interface_id = 1377 OPA_MAKE_ID(be32_to_cpu(pri_path->opa.dlid)); 1378 } 1379 if (pri_path->hop_limit <= 1) { 1380 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 1381 be16_to_cpu(pri_ext ? 0 : 1382 htons(ntohl(sa_path_get_slid( 1383 pri_path))))); 1384 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, 1385 be16_to_cpu(pri_ext ? 0 : 1386 htons(ntohl(sa_path_get_dlid( 1387 pri_path))))); 1388 } else { 1389 1390 if (param->primary_path_inbound) { 1391 lid = param->primary_path_inbound->ib.dlid; 1392 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 1393 be16_to_cpu(lid)); 1394 } else 1395 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 1396 be16_to_cpu(IB_LID_PERMISSIVE)); 1397 1398 /* Work-around until there's a way to obtain remote LID info */ 1399 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, 1400 be16_to_cpu(IB_LID_PERMISSIVE)); 1401 } 1402 IBA_SET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg, 1403 be32_to_cpu(pri_path->flow_label)); 1404 IBA_SET(CM_REQ_PRIMARY_PACKET_RATE, req_msg, pri_path->rate); 1405 IBA_SET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg, pri_path->traffic_class); 1406 IBA_SET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg, pri_path->hop_limit); 1407 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, pri_path->sl); 1408 IBA_SET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg, 1409 (pri_path->hop_limit <= 1)); 1410 IBA_SET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg, 1411 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1412 pri_path->packet_life_time)); 1413 1414 if (alt_path) { 1415 bool alt_ext = false; 1416 1417 if (alt_path->rec_type == SA_PATH_REC_TYPE_OPA) 1418 alt_ext = opa_is_extended_lid(alt_path->opa.dlid, 1419 alt_path->opa.slid); 1420 1421 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg) = 1422 alt_path->sgid; 1423 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg) = 1424 alt_path->dgid; 1425 if (alt_ext) { 1426 IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, 1427 req_msg) 1428 ->global.interface_id = 1429 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.slid)); 1430 IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, 1431 req_msg) 1432 ->global.interface_id = 1433 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.dlid)); 1434 } 1435 if (alt_path->hop_limit <= 1) { 1436 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, 1437 be16_to_cpu( 1438 alt_ext ? 0 : 1439 htons(ntohl(sa_path_get_slid( 1440 alt_path))))); 1441 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, 1442 be16_to_cpu( 1443 alt_ext ? 0 : 1444 htons(ntohl(sa_path_get_dlid( 1445 alt_path))))); 1446 } else { 1447 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, 1448 be16_to_cpu(IB_LID_PERMISSIVE)); 1449 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, 1450 be16_to_cpu(IB_LID_PERMISSIVE)); 1451 } 1452 IBA_SET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg, 1453 be32_to_cpu(alt_path->flow_label)); 1454 IBA_SET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg, alt_path->rate); 1455 IBA_SET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg, 1456 alt_path->traffic_class); 1457 IBA_SET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg, 1458 alt_path->hop_limit); 1459 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, alt_path->sl); 1460 IBA_SET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg, 1461 (alt_path->hop_limit <= 1)); 1462 IBA_SET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg, 1463 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1464 alt_path->packet_life_time)); 1465 } 1466 IBA_SET(CM_REQ_VENDOR_ID, req_msg, param->ece.vendor_id); 1467 1468 if (param->private_data && param->private_data_len) 1469 IBA_SET_MEM(CM_REQ_PRIVATE_DATA, req_msg, param->private_data, 1470 param->private_data_len); 1471 } 1472 1473 static int cm_validate_req_param(struct ib_cm_req_param *param) 1474 { 1475 if (!param->primary_path) 1476 return -EINVAL; 1477 1478 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC && 1479 param->qp_type != IB_QPT_XRC_INI) 1480 return -EINVAL; 1481 1482 if (param->private_data && 1483 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1484 return -EINVAL; 1485 1486 if (param->alternate_path && 1487 (param->alternate_path->pkey != param->primary_path->pkey || 1488 param->alternate_path->mtu != param->primary_path->mtu)) 1489 return -EINVAL; 1490 1491 return 0; 1492 } 1493 1494 int ib_send_cm_req(struct ib_cm_id *cm_id, 1495 struct ib_cm_req_param *param) 1496 { 1497 struct cm_av av = {}, alt_av = {}; 1498 struct cm_id_private *cm_id_priv; 1499 struct ib_mad_send_buf *msg; 1500 struct cm_req_msg *req_msg; 1501 unsigned long flags; 1502 int ret; 1503 1504 ret = cm_validate_req_param(param); 1505 if (ret) 1506 return ret; 1507 1508 /* Verify that we're not in timewait. */ 1509 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1510 spin_lock_irqsave(&cm_id_priv->lock, flags); 1511 if (cm_id->state != IB_CM_IDLE || WARN_ON(cm_id_priv->timewait_info)) { 1512 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1513 return -EINVAL; 1514 } 1515 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1516 1517 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1518 id.local_id); 1519 if (IS_ERR(cm_id_priv->timewait_info)) { 1520 ret = PTR_ERR(cm_id_priv->timewait_info); 1521 cm_id_priv->timewait_info = NULL; 1522 return ret; 1523 } 1524 1525 ret = cm_init_av_by_path(param->primary_path, 1526 param->ppath_sgid_attr, &av); 1527 if (ret) 1528 return ret; 1529 if (param->alternate_path) { 1530 ret = cm_init_av_by_path(param->alternate_path, NULL, 1531 &alt_av); 1532 if (ret) { 1533 cm_destroy_av(&av); 1534 return ret; 1535 } 1536 } 1537 cm_id->service_id = param->service_id; 1538 cm_id_priv->timeout_ms = cm_convert_to_ms( 1539 param->primary_path->packet_life_time) * 2 + 1540 cm_convert_to_ms( 1541 param->remote_cm_response_timeout); 1542 cm_id_priv->max_cm_retries = param->max_cm_retries; 1543 cm_id_priv->initiator_depth = param->initiator_depth; 1544 cm_id_priv->responder_resources = param->responder_resources; 1545 cm_id_priv->retry_count = param->retry_count; 1546 cm_id_priv->path_mtu = param->primary_path->mtu; 1547 cm_id_priv->pkey = param->primary_path->pkey; 1548 cm_id_priv->qp_type = param->qp_type; 1549 1550 spin_lock_irqsave(&cm_id_priv->lock, flags); 1551 1552 cm_move_av_from_path(&cm_id_priv->av, &av); 1553 if (param->primary_path_outbound) 1554 cm_id_priv->av.dlid_datapath = 1555 be16_to_cpu(param->primary_path_outbound->ib.dlid); 1556 1557 if (param->alternate_path) 1558 cm_move_av_from_path(&cm_id_priv->alt_av, &alt_av); 1559 1560 msg = cm_alloc_priv_msg(cm_id_priv); 1561 if (IS_ERR(msg)) { 1562 ret = PTR_ERR(msg); 1563 goto out_unlock; 1564 } 1565 1566 req_msg = (struct cm_req_msg *)msg->mad; 1567 cm_format_req(req_msg, cm_id_priv, param); 1568 cm_id_priv->tid = req_msg->hdr.tid; 1569 msg->timeout_ms = cm_id_priv->timeout_ms; 1570 msg->context[1] = (void *)(unsigned long)IB_CM_REQ_SENT; 1571 1572 cm_id_priv->local_qpn = cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg)); 1573 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg)); 1574 1575 trace_icm_send_req(&cm_id_priv->id); 1576 ret = ib_post_send_mad(msg, NULL); 1577 if (ret) 1578 goto out_free; 1579 BUG_ON(cm_id->state != IB_CM_IDLE); 1580 cm_id->state = IB_CM_REQ_SENT; 1581 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1582 return 0; 1583 out_free: 1584 cm_free_priv_msg(msg); 1585 out_unlock: 1586 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1587 return ret; 1588 } 1589 EXPORT_SYMBOL(ib_send_cm_req); 1590 1591 static int cm_issue_rej(struct cm_port *port, 1592 struct ib_mad_recv_wc *mad_recv_wc, 1593 enum ib_cm_rej_reason reason, 1594 enum cm_msg_response msg_rejected, 1595 void *ari, u8 ari_length) 1596 { 1597 struct ib_mad_send_buf *msg = NULL; 1598 struct cm_rej_msg *rej_msg, *rcv_msg; 1599 int ret; 1600 1601 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1602 if (ret) 1603 return ret; 1604 1605 /* We just need common CM header information. Cast to any message. */ 1606 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1607 rej_msg = (struct cm_rej_msg *) msg->mad; 1608 1609 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1610 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg, 1611 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg)); 1612 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1613 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg)); 1614 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, msg_rejected); 1615 IBA_SET(CM_REJ_REASON, rej_msg, reason); 1616 1617 if (ari && ari_length) { 1618 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length); 1619 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length); 1620 } 1621 1622 trace_icm_issue_rej( 1623 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg), 1624 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg)); 1625 ret = ib_post_send_mad(msg, NULL); 1626 if (ret) 1627 cm_free_response_msg(msg); 1628 1629 return ret; 1630 } 1631 1632 static bool cm_req_has_alt_path(struct cm_req_msg *req_msg) 1633 { 1634 return ((cpu_to_be16( 1635 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg))) || 1636 (ib_is_opa_gid(IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, 1637 req_msg)))); 1638 } 1639 1640 static void cm_path_set_rec_type(struct ib_device *ib_device, u32 port_num, 1641 struct sa_path_rec *path, union ib_gid *gid) 1642 { 1643 if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num)) 1644 path->rec_type = SA_PATH_REC_TYPE_OPA; 1645 else 1646 path->rec_type = SA_PATH_REC_TYPE_IB; 1647 } 1648 1649 static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg, 1650 struct sa_path_rec *primary_path, 1651 struct sa_path_rec *alt_path, 1652 struct ib_wc *wc) 1653 { 1654 u32 lid; 1655 1656 if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) { 1657 sa_path_set_dlid(primary_path, wc->slid); 1658 sa_path_set_slid(primary_path, 1659 IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID, 1660 req_msg)); 1661 } else { 1662 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1663 CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg)); 1664 sa_path_set_dlid(primary_path, lid); 1665 1666 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1667 CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg)); 1668 sa_path_set_slid(primary_path, lid); 1669 } 1670 1671 if (!cm_req_has_alt_path(req_msg)) 1672 return; 1673 1674 if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) { 1675 sa_path_set_dlid(alt_path, 1676 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, 1677 req_msg)); 1678 sa_path_set_slid(alt_path, 1679 IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, 1680 req_msg)); 1681 } else { 1682 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1683 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg)); 1684 sa_path_set_dlid(alt_path, lid); 1685 1686 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1687 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg)); 1688 sa_path_set_slid(alt_path, lid); 1689 } 1690 } 1691 1692 static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1693 struct sa_path_rec *primary_path, 1694 struct sa_path_rec *alt_path, 1695 struct ib_wc *wc) 1696 { 1697 primary_path->dgid = 1698 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg); 1699 primary_path->sgid = 1700 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg); 1701 primary_path->flow_label = 1702 cpu_to_be32(IBA_GET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg)); 1703 primary_path->hop_limit = IBA_GET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg); 1704 primary_path->traffic_class = 1705 IBA_GET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg); 1706 primary_path->reversible = 1; 1707 primary_path->pkey = 1708 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 1709 primary_path->sl = IBA_GET(CM_REQ_PRIMARY_SL, req_msg); 1710 primary_path->mtu_selector = IB_SA_EQ; 1711 primary_path->mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 1712 primary_path->rate_selector = IB_SA_EQ; 1713 primary_path->rate = IBA_GET(CM_REQ_PRIMARY_PACKET_RATE, req_msg); 1714 primary_path->packet_life_time_selector = IB_SA_EQ; 1715 primary_path->packet_life_time = 1716 IBA_GET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg); 1717 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1718 primary_path->service_id = 1719 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 1720 if (sa_path_is_roce(primary_path)) 1721 primary_path->roce.route_resolved = false; 1722 1723 if (cm_req_has_alt_path(req_msg)) { 1724 alt_path->dgid = *IBA_GET_MEM_PTR( 1725 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg); 1726 alt_path->sgid = *IBA_GET_MEM_PTR( 1727 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg); 1728 alt_path->flow_label = cpu_to_be32( 1729 IBA_GET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg)); 1730 alt_path->hop_limit = 1731 IBA_GET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg); 1732 alt_path->traffic_class = 1733 IBA_GET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg); 1734 alt_path->reversible = 1; 1735 alt_path->pkey = 1736 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 1737 alt_path->sl = IBA_GET(CM_REQ_ALTERNATE_SL, req_msg); 1738 alt_path->mtu_selector = IB_SA_EQ; 1739 alt_path->mtu = 1740 IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 1741 alt_path->rate_selector = IB_SA_EQ; 1742 alt_path->rate = IBA_GET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg); 1743 alt_path->packet_life_time_selector = IB_SA_EQ; 1744 alt_path->packet_life_time = 1745 IBA_GET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg); 1746 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1747 alt_path->service_id = 1748 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 1749 1750 if (sa_path_is_roce(alt_path)) 1751 alt_path->roce.route_resolved = false; 1752 } 1753 cm_format_path_lid_from_req(req_msg, primary_path, alt_path, wc); 1754 } 1755 1756 static u16 cm_get_bth_pkey(struct cm_work *work) 1757 { 1758 struct ib_device *ib_dev = work->port->cm_dev->ib_device; 1759 u32 port_num = work->port->port_num; 1760 u16 pkey_index = work->mad_recv_wc->wc->pkey_index; 1761 u16 pkey; 1762 int ret; 1763 1764 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey); 1765 if (ret) { 1766 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %u, pkey index %u). %d\n", 1767 port_num, pkey_index, ret); 1768 return 0; 1769 } 1770 1771 return pkey; 1772 } 1773 1774 /** 1775 * cm_opa_to_ib_sgid - Convert OPA SGID to IB SGID 1776 * ULPs (such as IPoIB) do not understand OPA GIDs and will 1777 * reject them as the local_gid will not match the sgid. Therefore, 1778 * change the pathrec's SGID to an IB SGID. 1779 * 1780 * @work: Work completion 1781 * @path: Path record 1782 */ 1783 static void cm_opa_to_ib_sgid(struct cm_work *work, 1784 struct sa_path_rec *path) 1785 { 1786 struct ib_device *dev = work->port->cm_dev->ib_device; 1787 u32 port_num = work->port->port_num; 1788 1789 if (rdma_cap_opa_ah(dev, port_num) && 1790 (ib_is_opa_gid(&path->sgid))) { 1791 union ib_gid sgid; 1792 1793 if (rdma_query_gid(dev, port_num, 0, &sgid)) { 1794 dev_warn(&dev->dev, 1795 "Error updating sgid in CM request\n"); 1796 return; 1797 } 1798 1799 path->sgid = sgid; 1800 } 1801 } 1802 1803 static void cm_format_req_event(struct cm_work *work, 1804 struct cm_id_private *cm_id_priv, 1805 struct ib_cm_id *listen_id) 1806 { 1807 struct cm_req_msg *req_msg; 1808 struct ib_cm_req_event_param *param; 1809 1810 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1811 param = &work->cm_event.param.req_rcvd; 1812 param->listen_id = listen_id; 1813 param->bth_pkey = cm_get_bth_pkey(work); 1814 param->port = cm_id_priv->av.port->port_num; 1815 param->primary_path = &work->path[0]; 1816 cm_opa_to_ib_sgid(work, param->primary_path); 1817 if (cm_req_has_alt_path(req_msg)) { 1818 param->alternate_path = &work->path[1]; 1819 cm_opa_to_ib_sgid(work, param->alternate_path); 1820 } else { 1821 param->alternate_path = NULL; 1822 } 1823 param->remote_ca_guid = 1824 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg)); 1825 param->remote_qkey = IBA_GET(CM_REQ_LOCAL_Q_KEY, req_msg); 1826 param->remote_qpn = IBA_GET(CM_REQ_LOCAL_QPN, req_msg); 1827 param->qp_type = cm_req_get_qp_type(req_msg); 1828 param->starting_psn = IBA_GET(CM_REQ_STARTING_PSN, req_msg); 1829 param->responder_resources = IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg); 1830 param->initiator_depth = IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg); 1831 param->local_cm_response_timeout = 1832 IBA_GET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg); 1833 param->flow_control = IBA_GET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg); 1834 param->remote_cm_response_timeout = 1835 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg); 1836 param->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg); 1837 param->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg); 1838 param->srq = IBA_GET(CM_REQ_SRQ, req_msg); 1839 param->ppath_sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr; 1840 param->ece.vendor_id = IBA_GET(CM_REQ_VENDOR_ID, req_msg); 1841 param->ece.attr_mod = be32_to_cpu(req_msg->hdr.attr_mod); 1842 1843 work->cm_event.private_data = 1844 IBA_GET_MEM_PTR(CM_REQ_PRIVATE_DATA, req_msg); 1845 } 1846 1847 static void cm_process_work(struct cm_id_private *cm_id_priv, 1848 struct cm_work *work) 1849 { 1850 int ret; 1851 1852 /* We will typically only have the current event to report. */ 1853 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1854 cm_free_work(work); 1855 1856 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1857 spin_lock_irq(&cm_id_priv->lock); 1858 work = cm_dequeue_work(cm_id_priv); 1859 spin_unlock_irq(&cm_id_priv->lock); 1860 if (!work) 1861 return; 1862 1863 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1864 &work->cm_event); 1865 cm_free_work(work); 1866 } 1867 cm_deref_id(cm_id_priv); 1868 if (ret) 1869 cm_destroy_id(&cm_id_priv->id, ret); 1870 } 1871 1872 static void cm_format_mra(struct cm_mra_msg *mra_msg, 1873 struct cm_id_private *cm_id_priv, 1874 enum cm_msg_response msg_mraed, u8 service_timeout, 1875 const void *private_data, u8 private_data_len) 1876 { 1877 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1878 IBA_SET(CM_MRA_MESSAGE_MRAED, mra_msg, msg_mraed); 1879 IBA_SET(CM_MRA_LOCAL_COMM_ID, mra_msg, 1880 be32_to_cpu(cm_id_priv->id.local_id)); 1881 IBA_SET(CM_MRA_REMOTE_COMM_ID, mra_msg, 1882 be32_to_cpu(cm_id_priv->id.remote_id)); 1883 IBA_SET(CM_MRA_SERVICE_TIMEOUT, mra_msg, service_timeout); 1884 1885 if (private_data && private_data_len) 1886 IBA_SET_MEM(CM_MRA_PRIVATE_DATA, mra_msg, private_data, 1887 private_data_len); 1888 } 1889 1890 static void cm_format_rej(struct cm_rej_msg *rej_msg, 1891 struct cm_id_private *cm_id_priv, 1892 enum ib_cm_rej_reason reason, void *ari, 1893 u8 ari_length, const void *private_data, 1894 u8 private_data_len, enum ib_cm_state state) 1895 { 1896 lockdep_assert_held(&cm_id_priv->lock); 1897 1898 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1899 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg, 1900 be32_to_cpu(cm_id_priv->id.remote_id)); 1901 1902 switch (state) { 1903 case IB_CM_REQ_RCVD: 1904 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, be32_to_cpu(0)); 1905 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ); 1906 break; 1907 case IB_CM_MRA_REQ_SENT: 1908 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1909 be32_to_cpu(cm_id_priv->id.local_id)); 1910 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ); 1911 break; 1912 case IB_CM_REP_RCVD: 1913 case IB_CM_MRA_REP_SENT: 1914 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1915 be32_to_cpu(cm_id_priv->id.local_id)); 1916 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REP); 1917 break; 1918 default: 1919 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1920 be32_to_cpu(cm_id_priv->id.local_id)); 1921 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, 1922 CM_MSG_RESPONSE_OTHER); 1923 break; 1924 } 1925 1926 IBA_SET(CM_REJ_REASON, rej_msg, reason); 1927 if (ari && ari_length) { 1928 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length); 1929 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length); 1930 } 1931 1932 if (private_data && private_data_len) 1933 IBA_SET_MEM(CM_REJ_PRIVATE_DATA, rej_msg, private_data, 1934 private_data_len); 1935 } 1936 1937 static void cm_dup_req_handler(struct cm_work *work, 1938 struct cm_id_private *cm_id_priv) 1939 { 1940 struct ib_mad_send_buf *msg = NULL; 1941 int ret; 1942 1943 atomic_long_inc( 1944 &work->port->counters[CM_RECV_DUPLICATES][CM_REQ_COUNTER]); 1945 1946 /* Quick state check to discard duplicate REQs. */ 1947 spin_lock_irq(&cm_id_priv->lock); 1948 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) { 1949 spin_unlock_irq(&cm_id_priv->lock); 1950 return; 1951 } 1952 spin_unlock_irq(&cm_id_priv->lock); 1953 1954 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1955 if (ret) 1956 return; 1957 1958 spin_lock_irq(&cm_id_priv->lock); 1959 switch (cm_id_priv->id.state) { 1960 case IB_CM_MRA_REQ_SENT: 1961 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1962 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1963 cm_id_priv->private_data, 1964 cm_id_priv->private_data_len); 1965 break; 1966 case IB_CM_TIMEWAIT: 1967 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, 1968 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0, 1969 IB_CM_TIMEWAIT); 1970 break; 1971 default: 1972 goto unlock; 1973 } 1974 spin_unlock_irq(&cm_id_priv->lock); 1975 1976 trace_icm_send_dup_req(&cm_id_priv->id); 1977 ret = ib_post_send_mad(msg, NULL); 1978 if (ret) 1979 goto free; 1980 return; 1981 1982 unlock: spin_unlock_irq(&cm_id_priv->lock); 1983 free: cm_free_response_msg(msg); 1984 } 1985 1986 static struct cm_id_private *cm_match_req(struct cm_work *work, 1987 struct cm_id_private *cm_id_priv) 1988 { 1989 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1990 struct cm_timewait_info *timewait_info; 1991 struct cm_req_msg *req_msg; 1992 1993 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1994 1995 /* Check for possible duplicate REQ. */ 1996 spin_lock_irq(&cm.lock); 1997 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1998 if (timewait_info) { 1999 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2000 timewait_info->work.remote_id); 2001 spin_unlock_irq(&cm.lock); 2002 if (cur_cm_id_priv) { 2003 cm_dup_req_handler(work, cur_cm_id_priv); 2004 cm_deref_id(cur_cm_id_priv); 2005 } 2006 return NULL; 2007 } 2008 2009 /* Check for stale connections. */ 2010 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 2011 if (timewait_info) { 2012 cm_remove_remote(cm_id_priv); 2013 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2014 timewait_info->work.remote_id); 2015 2016 spin_unlock_irq(&cm.lock); 2017 cm_issue_rej(work->port, work->mad_recv_wc, 2018 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 2019 NULL, 0); 2020 if (cur_cm_id_priv) { 2021 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0); 2022 cm_deref_id(cur_cm_id_priv); 2023 } 2024 return NULL; 2025 } 2026 2027 /* Find matching listen request. */ 2028 listen_cm_id_priv = cm_find_listen( 2029 cm_id_priv->id.device, 2030 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg))); 2031 if (!listen_cm_id_priv) { 2032 cm_remove_remote(cm_id_priv); 2033 spin_unlock_irq(&cm.lock); 2034 cm_issue_rej(work->port, work->mad_recv_wc, 2035 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 2036 NULL, 0); 2037 return NULL; 2038 } 2039 spin_unlock_irq(&cm.lock); 2040 return listen_cm_id_priv; 2041 } 2042 2043 /* 2044 * Work-around for inter-subnet connections. If the LIDs are permissive, 2045 * we need to override the LID/SL data in the REQ with the LID information 2046 * in the work completion. 2047 */ 2048 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 2049 { 2050 if (!IBA_GET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg)) { 2051 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID, 2052 req_msg)) == IB_LID_PERMISSIVE) { 2053 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 2054 be16_to_cpu(ib_lid_be16(wc->slid))); 2055 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, wc->sl); 2056 } 2057 2058 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID, 2059 req_msg)) == IB_LID_PERMISSIVE) 2060 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, 2061 wc->dlid_path_bits); 2062 } 2063 2064 if (!IBA_GET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg)) { 2065 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, 2066 req_msg)) == IB_LID_PERMISSIVE) { 2067 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, 2068 be16_to_cpu(ib_lid_be16(wc->slid))); 2069 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, wc->sl); 2070 } 2071 2072 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, 2073 req_msg)) == IB_LID_PERMISSIVE) 2074 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, 2075 wc->dlid_path_bits); 2076 } 2077 } 2078 2079 static int cm_req_handler(struct cm_work *work) 2080 { 2081 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 2082 struct cm_req_msg *req_msg; 2083 const struct ib_global_route *grh; 2084 const struct ib_gid_attr *gid_attr; 2085 int ret; 2086 2087 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 2088 2089 cm_id_priv = 2090 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL); 2091 if (IS_ERR(cm_id_priv)) 2092 return PTR_ERR(cm_id_priv); 2093 2094 cm_id_priv->id.remote_id = 2095 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_COMM_ID, req_msg)); 2096 cm_id_priv->id.service_id = 2097 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 2098 cm_id_priv->tid = req_msg->hdr.tid; 2099 cm_id_priv->timeout_ms = cm_convert_to_ms( 2100 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg)); 2101 cm_id_priv->max_cm_retries = IBA_GET(CM_REQ_MAX_CM_RETRIES, req_msg); 2102 cm_id_priv->remote_qpn = 2103 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg)); 2104 cm_id_priv->initiator_depth = 2105 IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg); 2106 cm_id_priv->responder_resources = 2107 IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg); 2108 cm_id_priv->path_mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 2109 cm_id_priv->pkey = cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 2110 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg)); 2111 cm_id_priv->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg); 2112 cm_id_priv->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg); 2113 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 2114 2115 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2116 work->mad_recv_wc->recv_buf.grh, 2117 &cm_id_priv->av); 2118 if (ret) 2119 goto destroy; 2120 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 2121 id.local_id); 2122 if (IS_ERR(cm_id_priv->timewait_info)) { 2123 ret = PTR_ERR(cm_id_priv->timewait_info); 2124 cm_id_priv->timewait_info = NULL; 2125 goto destroy; 2126 } 2127 cm_id_priv->timewait_info->work.remote_id = cm_id_priv->id.remote_id; 2128 cm_id_priv->timewait_info->remote_ca_guid = 2129 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg)); 2130 cm_id_priv->timewait_info->remote_qpn = cm_id_priv->remote_qpn; 2131 2132 /* 2133 * Note that the ID pointer is not in the xarray at this point, 2134 * so this set is only visible to the local thread. 2135 */ 2136 cm_id_priv->id.state = IB_CM_REQ_RCVD; 2137 2138 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 2139 if (!listen_cm_id_priv) { 2140 trace_icm_no_listener_err(&cm_id_priv->id); 2141 cm_id_priv->id.state = IB_CM_IDLE; 2142 ret = -EINVAL; 2143 goto destroy; 2144 } 2145 2146 memset(&work->path[0], 0, sizeof(work->path[0])); 2147 if (cm_req_has_alt_path(req_msg)) 2148 memset(&work->path[1], 0, sizeof(work->path[1])); 2149 grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr); 2150 gid_attr = grh->sgid_attr; 2151 2152 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE) { 2153 work->path[0].rec_type = 2154 sa_conv_gid_to_pathrec_type(gid_attr->gid_type); 2155 } else { 2156 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 2157 cm_path_set_rec_type( 2158 work->port->cm_dev->ib_device, work->port->port_num, 2159 &work->path[0], 2160 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, 2161 req_msg)); 2162 } 2163 if (cm_req_has_alt_path(req_msg)) 2164 work->path[1].rec_type = work->path[0].rec_type; 2165 cm_format_paths_from_req(req_msg, &work->path[0], 2166 &work->path[1], work->mad_recv_wc->wc); 2167 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE) 2168 sa_path_set_dmac(&work->path[0], 2169 cm_id_priv->av.ah_attr.roce.dmac); 2170 work->path[0].hop_limit = grh->hop_limit; 2171 2172 /* This destroy call is needed to pair with cm_init_av_for_response */ 2173 cm_destroy_av(&cm_id_priv->av); 2174 ret = cm_init_av_by_path(&work->path[0], gid_attr, &cm_id_priv->av); 2175 if (ret) { 2176 int err; 2177 2178 err = rdma_query_gid(work->port->cm_dev->ib_device, 2179 work->port->port_num, 0, 2180 &work->path[0].sgid); 2181 if (err) 2182 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID, 2183 NULL, 0, NULL, 0); 2184 else 2185 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID, 2186 &work->path[0].sgid, 2187 sizeof(work->path[0].sgid), 2188 NULL, 0); 2189 goto rejected; 2190 } 2191 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_IB) 2192 cm_id_priv->av.dlid_datapath = 2193 IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg); 2194 2195 if (cm_req_has_alt_path(req_msg)) { 2196 ret = cm_init_av_by_path(&work->path[1], NULL, 2197 &cm_id_priv->alt_av); 2198 if (ret) { 2199 ib_send_cm_rej(&cm_id_priv->id, 2200 IB_CM_REJ_INVALID_ALT_GID, 2201 &work->path[0].sgid, 2202 sizeof(work->path[0].sgid), NULL, 0); 2203 goto rejected; 2204 } 2205 } 2206 2207 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 2208 cm_id_priv->id.context = listen_cm_id_priv->id.context; 2209 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 2210 2211 /* Now MAD handlers can see the new ID */ 2212 spin_lock_irq(&cm_id_priv->lock); 2213 cm_finalize_id(cm_id_priv); 2214 2215 /* Refcount belongs to the event, pairs with cm_process_work() */ 2216 refcount_inc(&cm_id_priv->refcount); 2217 cm_queue_work_unlock(cm_id_priv, work); 2218 /* 2219 * Since this ID was just created and was not made visible to other MAD 2220 * handlers until the cm_finalize_id() above we know that the 2221 * cm_process_work() will deliver the event and the listen_cm_id 2222 * embedded in the event can be derefed here. 2223 */ 2224 cm_deref_id(listen_cm_id_priv); 2225 return 0; 2226 2227 rejected: 2228 cm_deref_id(listen_cm_id_priv); 2229 destroy: 2230 ib_destroy_cm_id(&cm_id_priv->id); 2231 return ret; 2232 } 2233 2234 static void cm_format_rep(struct cm_rep_msg *rep_msg, 2235 struct cm_id_private *cm_id_priv, 2236 struct ib_cm_rep_param *param) 2237 { 2238 cm_format_mad_ece_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid, 2239 param->ece.attr_mod); 2240 IBA_SET(CM_REP_LOCAL_COMM_ID, rep_msg, 2241 be32_to_cpu(cm_id_priv->id.local_id)); 2242 IBA_SET(CM_REP_REMOTE_COMM_ID, rep_msg, 2243 be32_to_cpu(cm_id_priv->id.remote_id)); 2244 IBA_SET(CM_REP_STARTING_PSN, rep_msg, param->starting_psn); 2245 IBA_SET(CM_REP_RESPONDER_RESOURCES, rep_msg, 2246 param->responder_resources); 2247 IBA_SET(CM_REP_TARGET_ACK_DELAY, rep_msg, 2248 cm_id_priv->av.port->cm_dev->ack_delay); 2249 IBA_SET(CM_REP_FAILOVER_ACCEPTED, rep_msg, param->failover_accepted); 2250 IBA_SET(CM_REP_RNR_RETRY_COUNT, rep_msg, param->rnr_retry_count); 2251 IBA_SET(CM_REP_LOCAL_CA_GUID, rep_msg, 2252 be64_to_cpu(cm_id_priv->id.device->node_guid)); 2253 2254 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) { 2255 IBA_SET(CM_REP_INITIATOR_DEPTH, rep_msg, 2256 param->initiator_depth); 2257 IBA_SET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg, 2258 param->flow_control); 2259 IBA_SET(CM_REP_SRQ, rep_msg, param->srq); 2260 IBA_SET(CM_REP_LOCAL_QPN, rep_msg, param->qp_num); 2261 } else { 2262 IBA_SET(CM_REP_SRQ, rep_msg, 1); 2263 IBA_SET(CM_REP_LOCAL_EE_CONTEXT_NUMBER, rep_msg, param->qp_num); 2264 } 2265 2266 IBA_SET(CM_REP_VENDOR_ID_L, rep_msg, param->ece.vendor_id); 2267 IBA_SET(CM_REP_VENDOR_ID_M, rep_msg, param->ece.vendor_id >> 8); 2268 IBA_SET(CM_REP_VENDOR_ID_H, rep_msg, param->ece.vendor_id >> 16); 2269 2270 if (param->private_data && param->private_data_len) 2271 IBA_SET_MEM(CM_REP_PRIVATE_DATA, rep_msg, param->private_data, 2272 param->private_data_len); 2273 } 2274 2275 int ib_send_cm_rep(struct ib_cm_id *cm_id, 2276 struct ib_cm_rep_param *param) 2277 { 2278 struct cm_id_private *cm_id_priv; 2279 struct ib_mad_send_buf *msg; 2280 struct cm_rep_msg *rep_msg; 2281 unsigned long flags; 2282 int ret; 2283 2284 if (param->private_data && 2285 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 2286 return -EINVAL; 2287 2288 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2289 spin_lock_irqsave(&cm_id_priv->lock, flags); 2290 if (cm_id->state != IB_CM_REQ_RCVD && 2291 cm_id->state != IB_CM_MRA_REQ_SENT) { 2292 trace_icm_send_rep_err(cm_id_priv->id.local_id, cm_id->state); 2293 ret = -EINVAL; 2294 goto out; 2295 } 2296 2297 msg = cm_alloc_priv_msg(cm_id_priv); 2298 if (IS_ERR(msg)) { 2299 ret = PTR_ERR(msg); 2300 goto out; 2301 } 2302 2303 rep_msg = (struct cm_rep_msg *) msg->mad; 2304 cm_format_rep(rep_msg, cm_id_priv, param); 2305 msg->timeout_ms = cm_id_priv->timeout_ms; 2306 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 2307 2308 trace_icm_send_rep(cm_id); 2309 ret = ib_post_send_mad(msg, NULL); 2310 if (ret) 2311 goto out_free; 2312 2313 cm_id->state = IB_CM_REP_SENT; 2314 cm_id_priv->initiator_depth = param->initiator_depth; 2315 cm_id_priv->responder_resources = param->responder_resources; 2316 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg)); 2317 WARN_ONCE(param->qp_num & 0xFF000000, 2318 "IBTA declares QPN to be 24 bits, but it is 0x%X\n", 2319 param->qp_num); 2320 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF); 2321 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2322 return 0; 2323 2324 out_free: 2325 cm_free_priv_msg(msg); 2326 out: 2327 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2328 return ret; 2329 } 2330 EXPORT_SYMBOL(ib_send_cm_rep); 2331 2332 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 2333 struct cm_id_private *cm_id_priv, 2334 const void *private_data, 2335 u8 private_data_len) 2336 { 2337 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 2338 IBA_SET(CM_RTU_LOCAL_COMM_ID, rtu_msg, 2339 be32_to_cpu(cm_id_priv->id.local_id)); 2340 IBA_SET(CM_RTU_REMOTE_COMM_ID, rtu_msg, 2341 be32_to_cpu(cm_id_priv->id.remote_id)); 2342 2343 if (private_data && private_data_len) 2344 IBA_SET_MEM(CM_RTU_PRIVATE_DATA, rtu_msg, private_data, 2345 private_data_len); 2346 } 2347 2348 int ib_send_cm_rtu(struct ib_cm_id *cm_id, 2349 const void *private_data, 2350 u8 private_data_len) 2351 { 2352 struct cm_id_private *cm_id_priv; 2353 struct ib_mad_send_buf *msg; 2354 unsigned long flags; 2355 void *data; 2356 int ret; 2357 2358 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 2359 return -EINVAL; 2360 2361 data = cm_copy_private_data(private_data, private_data_len); 2362 if (IS_ERR(data)) 2363 return PTR_ERR(data); 2364 2365 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2366 spin_lock_irqsave(&cm_id_priv->lock, flags); 2367 if (cm_id->state != IB_CM_REP_RCVD && 2368 cm_id->state != IB_CM_MRA_REP_SENT) { 2369 trace_icm_send_cm_rtu_err(cm_id); 2370 ret = -EINVAL; 2371 goto error; 2372 } 2373 2374 msg = cm_alloc_msg(cm_id_priv); 2375 if (IS_ERR(msg)) { 2376 ret = PTR_ERR(msg); 2377 goto error; 2378 } 2379 2380 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 2381 private_data, private_data_len); 2382 2383 trace_icm_send_rtu(cm_id); 2384 ret = ib_post_send_mad(msg, NULL); 2385 if (ret) { 2386 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2387 cm_free_msg(msg); 2388 kfree(data); 2389 return ret; 2390 } 2391 2392 cm_id->state = IB_CM_ESTABLISHED; 2393 cm_set_private_data(cm_id_priv, data, private_data_len); 2394 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2395 return 0; 2396 2397 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2398 kfree(data); 2399 return ret; 2400 } 2401 EXPORT_SYMBOL(ib_send_cm_rtu); 2402 2403 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type) 2404 { 2405 struct cm_rep_msg *rep_msg; 2406 struct ib_cm_rep_event_param *param; 2407 2408 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 2409 param = &work->cm_event.param.rep_rcvd; 2410 param->remote_ca_guid = 2411 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg)); 2412 param->remote_qkey = IBA_GET(CM_REP_LOCAL_Q_KEY, rep_msg); 2413 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type)); 2414 param->starting_psn = IBA_GET(CM_REP_STARTING_PSN, rep_msg); 2415 param->responder_resources = IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg); 2416 param->initiator_depth = IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg); 2417 param->target_ack_delay = IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg); 2418 param->failover_accepted = IBA_GET(CM_REP_FAILOVER_ACCEPTED, rep_msg); 2419 param->flow_control = IBA_GET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg); 2420 param->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg); 2421 param->srq = IBA_GET(CM_REP_SRQ, rep_msg); 2422 param->ece.vendor_id = IBA_GET(CM_REP_VENDOR_ID_H, rep_msg) << 16; 2423 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_M, rep_msg) << 8; 2424 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_L, rep_msg); 2425 param->ece.attr_mod = be32_to_cpu(rep_msg->hdr.attr_mod); 2426 2427 work->cm_event.private_data = 2428 IBA_GET_MEM_PTR(CM_REP_PRIVATE_DATA, rep_msg); 2429 } 2430 2431 static void cm_dup_rep_handler(struct cm_work *work) 2432 { 2433 struct cm_id_private *cm_id_priv; 2434 struct cm_rep_msg *rep_msg; 2435 struct ib_mad_send_buf *msg = NULL; 2436 int ret; 2437 2438 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 2439 cm_id_priv = cm_acquire_id( 2440 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 2441 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg))); 2442 if (!cm_id_priv) 2443 return; 2444 2445 atomic_long_inc( 2446 &work->port->counters[CM_RECV_DUPLICATES][CM_REP_COUNTER]); 2447 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 2448 if (ret) 2449 goto deref; 2450 2451 spin_lock_irq(&cm_id_priv->lock); 2452 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 2453 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 2454 cm_id_priv->private_data, 2455 cm_id_priv->private_data_len); 2456 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 2457 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2458 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 2459 cm_id_priv->private_data, 2460 cm_id_priv->private_data_len); 2461 else 2462 goto unlock; 2463 spin_unlock_irq(&cm_id_priv->lock); 2464 2465 trace_icm_send_dup_rep(&cm_id_priv->id); 2466 ret = ib_post_send_mad(msg, NULL); 2467 if (ret) 2468 goto free; 2469 goto deref; 2470 2471 unlock: spin_unlock_irq(&cm_id_priv->lock); 2472 free: cm_free_response_msg(msg); 2473 deref: cm_deref_id(cm_id_priv); 2474 } 2475 2476 static int cm_rep_handler(struct cm_work *work) 2477 { 2478 struct cm_id_private *cm_id_priv; 2479 struct cm_rep_msg *rep_msg; 2480 int ret; 2481 struct cm_id_private *cur_cm_id_priv; 2482 struct cm_timewait_info *timewait_info; 2483 2484 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 2485 cm_id_priv = cm_acquire_id( 2486 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 0); 2487 if (!cm_id_priv) { 2488 cm_dup_rep_handler(work); 2489 trace_icm_remote_no_priv_err( 2490 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2491 return -EINVAL; 2492 } 2493 2494 cm_format_rep_event(work, cm_id_priv->qp_type); 2495 2496 spin_lock_irq(&cm_id_priv->lock); 2497 switch (cm_id_priv->id.state) { 2498 case IB_CM_REQ_SENT: 2499 case IB_CM_MRA_REQ_RCVD: 2500 break; 2501 default: 2502 ret = -EINVAL; 2503 trace_icm_rep_unknown_err( 2504 IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg), 2505 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg), 2506 cm_id_priv->id.state); 2507 spin_unlock_irq(&cm_id_priv->lock); 2508 goto error; 2509 } 2510 2511 cm_id_priv->timewait_info->work.remote_id = 2512 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)); 2513 cm_id_priv->timewait_info->remote_ca_guid = 2514 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg)); 2515 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2516 2517 spin_lock(&cm.lock); 2518 /* Check for duplicate REP. */ 2519 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 2520 spin_unlock(&cm.lock); 2521 spin_unlock_irq(&cm_id_priv->lock); 2522 ret = -EINVAL; 2523 trace_icm_insert_failed_err( 2524 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2525 goto error; 2526 } 2527 /* Check for a stale connection. */ 2528 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 2529 if (timewait_info) { 2530 cm_remove_remote(cm_id_priv); 2531 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2532 timewait_info->work.remote_id); 2533 2534 spin_unlock(&cm.lock); 2535 spin_unlock_irq(&cm_id_priv->lock); 2536 cm_issue_rej(work->port, work->mad_recv_wc, 2537 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 2538 NULL, 0); 2539 ret = -EINVAL; 2540 trace_icm_staleconn_err( 2541 IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg), 2542 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2543 2544 if (cur_cm_id_priv) { 2545 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0); 2546 cm_deref_id(cur_cm_id_priv); 2547 } 2548 2549 goto error; 2550 } 2551 spin_unlock(&cm.lock); 2552 2553 cm_id_priv->id.state = IB_CM_REP_RCVD; 2554 cm_id_priv->id.remote_id = 2555 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)); 2556 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2557 cm_id_priv->initiator_depth = 2558 IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg); 2559 cm_id_priv->responder_resources = 2560 IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg); 2561 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg)); 2562 cm_id_priv->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg); 2563 cm_id_priv->target_ack_delay = 2564 IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg); 2565 cm_id_priv->av.timeout = 2566 cm_ack_timeout(cm_id_priv->target_ack_delay, 2567 cm_id_priv->av.timeout - 1); 2568 cm_id_priv->alt_av.timeout = 2569 cm_ack_timeout(cm_id_priv->target_ack_delay, 2570 cm_id_priv->alt_av.timeout - 1); 2571 2572 ib_cancel_mad(cm_id_priv->msg); 2573 cm_queue_work_unlock(cm_id_priv, work); 2574 return 0; 2575 2576 error: 2577 cm_deref_id(cm_id_priv); 2578 return ret; 2579 } 2580 2581 static int cm_establish_handler(struct cm_work *work) 2582 { 2583 struct cm_id_private *cm_id_priv; 2584 2585 /* See comment in cm_establish about lookup. */ 2586 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 2587 if (!cm_id_priv) 2588 return -EINVAL; 2589 2590 spin_lock_irq(&cm_id_priv->lock); 2591 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 2592 spin_unlock_irq(&cm_id_priv->lock); 2593 goto out; 2594 } 2595 2596 ib_cancel_mad(cm_id_priv->msg); 2597 cm_queue_work_unlock(cm_id_priv, work); 2598 return 0; 2599 out: 2600 cm_deref_id(cm_id_priv); 2601 return -EINVAL; 2602 } 2603 2604 static int cm_rtu_handler(struct cm_work *work) 2605 { 2606 struct cm_id_private *cm_id_priv; 2607 struct cm_rtu_msg *rtu_msg; 2608 2609 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 2610 cm_id_priv = cm_acquire_id( 2611 cpu_to_be32(IBA_GET(CM_RTU_REMOTE_COMM_ID, rtu_msg)), 2612 cpu_to_be32(IBA_GET(CM_RTU_LOCAL_COMM_ID, rtu_msg))); 2613 if (!cm_id_priv) 2614 return -EINVAL; 2615 2616 work->cm_event.private_data = 2617 IBA_GET_MEM_PTR(CM_RTU_PRIVATE_DATA, rtu_msg); 2618 2619 spin_lock_irq(&cm_id_priv->lock); 2620 if (cm_id_priv->id.state != IB_CM_REP_SENT && 2621 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 2622 spin_unlock_irq(&cm_id_priv->lock); 2623 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 2624 [CM_RTU_COUNTER]); 2625 goto out; 2626 } 2627 cm_id_priv->id.state = IB_CM_ESTABLISHED; 2628 2629 ib_cancel_mad(cm_id_priv->msg); 2630 cm_queue_work_unlock(cm_id_priv, work); 2631 return 0; 2632 out: 2633 cm_deref_id(cm_id_priv); 2634 return -EINVAL; 2635 } 2636 2637 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 2638 struct cm_id_private *cm_id_priv, 2639 const void *private_data, 2640 u8 private_data_len) 2641 { 2642 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 2643 cm_form_tid(cm_id_priv)); 2644 IBA_SET(CM_DREQ_LOCAL_COMM_ID, dreq_msg, 2645 be32_to_cpu(cm_id_priv->id.local_id)); 2646 IBA_SET(CM_DREQ_REMOTE_COMM_ID, dreq_msg, 2647 be32_to_cpu(cm_id_priv->id.remote_id)); 2648 IBA_SET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg, 2649 be32_to_cpu(cm_id_priv->remote_qpn)); 2650 2651 if (private_data && private_data_len) 2652 IBA_SET_MEM(CM_DREQ_PRIVATE_DATA, dreq_msg, private_data, 2653 private_data_len); 2654 } 2655 2656 static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv, 2657 const void *private_data, u8 private_data_len) 2658 { 2659 struct ib_mad_send_buf *msg; 2660 int ret; 2661 2662 lockdep_assert_held(&cm_id_priv->lock); 2663 2664 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 2665 return -EINVAL; 2666 2667 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 2668 trace_icm_dreq_skipped(&cm_id_priv->id); 2669 return -EINVAL; 2670 } 2671 2672 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2673 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2674 ib_cancel_mad(cm_id_priv->msg); 2675 2676 msg = cm_alloc_priv_msg(cm_id_priv); 2677 if (IS_ERR(msg)) { 2678 cm_enter_timewait(cm_id_priv); 2679 return PTR_ERR(msg); 2680 } 2681 2682 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 2683 private_data, private_data_len); 2684 msg->timeout_ms = cm_id_priv->timeout_ms; 2685 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2686 2687 trace_icm_send_dreq(&cm_id_priv->id); 2688 ret = ib_post_send_mad(msg, NULL); 2689 if (ret) { 2690 cm_enter_timewait(cm_id_priv); 2691 cm_free_priv_msg(msg); 2692 return ret; 2693 } 2694 2695 cm_id_priv->id.state = IB_CM_DREQ_SENT; 2696 return 0; 2697 } 2698 2699 int ib_send_cm_dreq(struct ib_cm_id *cm_id, const void *private_data, 2700 u8 private_data_len) 2701 { 2702 struct cm_id_private *cm_id_priv = 2703 container_of(cm_id, struct cm_id_private, id); 2704 unsigned long flags; 2705 int ret; 2706 2707 spin_lock_irqsave(&cm_id_priv->lock, flags); 2708 ret = cm_send_dreq_locked(cm_id_priv, private_data, private_data_len); 2709 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2710 return ret; 2711 } 2712 EXPORT_SYMBOL(ib_send_cm_dreq); 2713 2714 static void cm_format_drep(struct cm_drep_msg *drep_msg, 2715 struct cm_id_private *cm_id_priv, 2716 const void *private_data, 2717 u8 private_data_len) 2718 { 2719 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2720 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg, 2721 be32_to_cpu(cm_id_priv->id.local_id)); 2722 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg, 2723 be32_to_cpu(cm_id_priv->id.remote_id)); 2724 2725 if (private_data && private_data_len) 2726 IBA_SET_MEM(CM_DREP_PRIVATE_DATA, drep_msg, private_data, 2727 private_data_len); 2728 } 2729 2730 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv, 2731 void *private_data, u8 private_data_len) 2732 { 2733 struct ib_mad_send_buf *msg; 2734 int ret; 2735 2736 lockdep_assert_held(&cm_id_priv->lock); 2737 2738 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2739 return -EINVAL; 2740 2741 if (cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2742 trace_icm_send_drep_err(&cm_id_priv->id); 2743 kfree(private_data); 2744 return -EINVAL; 2745 } 2746 2747 cm_set_private_data(cm_id_priv, private_data, private_data_len); 2748 cm_enter_timewait(cm_id_priv); 2749 2750 msg = cm_alloc_msg(cm_id_priv); 2751 if (IS_ERR(msg)) 2752 return PTR_ERR(msg); 2753 2754 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2755 private_data, private_data_len); 2756 2757 trace_icm_send_drep(&cm_id_priv->id); 2758 ret = ib_post_send_mad(msg, NULL); 2759 if (ret) { 2760 cm_free_msg(msg); 2761 return ret; 2762 } 2763 return 0; 2764 } 2765 2766 int ib_send_cm_drep(struct ib_cm_id *cm_id, const void *private_data, 2767 u8 private_data_len) 2768 { 2769 struct cm_id_private *cm_id_priv = 2770 container_of(cm_id, struct cm_id_private, id); 2771 unsigned long flags; 2772 void *data; 2773 int ret; 2774 2775 data = cm_copy_private_data(private_data, private_data_len); 2776 if (IS_ERR(data)) 2777 return PTR_ERR(data); 2778 2779 spin_lock_irqsave(&cm_id_priv->lock, flags); 2780 ret = cm_send_drep_locked(cm_id_priv, data, private_data_len); 2781 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2782 return ret; 2783 } 2784 EXPORT_SYMBOL(ib_send_cm_drep); 2785 2786 static int cm_issue_drep(struct cm_port *port, 2787 struct ib_mad_recv_wc *mad_recv_wc) 2788 { 2789 struct ib_mad_send_buf *msg = NULL; 2790 struct cm_dreq_msg *dreq_msg; 2791 struct cm_drep_msg *drep_msg; 2792 int ret; 2793 2794 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2795 if (ret) 2796 return ret; 2797 2798 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2799 drep_msg = (struct cm_drep_msg *) msg->mad; 2800 2801 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2802 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg, 2803 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg)); 2804 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg, 2805 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)); 2806 2807 trace_icm_issue_drep( 2808 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg), 2809 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)); 2810 ret = ib_post_send_mad(msg, NULL); 2811 if (ret) 2812 cm_free_response_msg(msg); 2813 2814 return ret; 2815 } 2816 2817 static int cm_dreq_handler(struct cm_work *work) 2818 { 2819 struct cm_id_private *cm_id_priv; 2820 struct cm_dreq_msg *dreq_msg; 2821 struct ib_mad_send_buf *msg = NULL; 2822 2823 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2824 cm_id_priv = cm_acquire_id( 2825 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)), 2826 cpu_to_be32(IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg))); 2827 if (!cm_id_priv) { 2828 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 2829 [CM_DREQ_COUNTER]); 2830 cm_issue_drep(work->port, work->mad_recv_wc); 2831 trace_icm_no_priv_err( 2832 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg), 2833 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)); 2834 return -EINVAL; 2835 } 2836 2837 work->cm_event.private_data = 2838 IBA_GET_MEM_PTR(CM_DREQ_PRIVATE_DATA, dreq_msg); 2839 2840 spin_lock_irq(&cm_id_priv->lock); 2841 if (cm_id_priv->local_qpn != 2842 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg))) 2843 goto unlock; 2844 2845 switch (cm_id_priv->id.state) { 2846 case IB_CM_REP_SENT: 2847 case IB_CM_DREQ_SENT: 2848 case IB_CM_MRA_REP_RCVD: 2849 ib_cancel_mad(cm_id_priv->msg); 2850 break; 2851 case IB_CM_ESTABLISHED: 2852 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2853 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2854 ib_cancel_mad(cm_id_priv->msg); 2855 break; 2856 case IB_CM_TIMEWAIT: 2857 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 2858 [CM_DREQ_COUNTER]); 2859 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc); 2860 if (IS_ERR(msg)) 2861 goto unlock; 2862 2863 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2864 cm_id_priv->private_data, 2865 cm_id_priv->private_data_len); 2866 spin_unlock_irq(&cm_id_priv->lock); 2867 2868 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || 2869 ib_post_send_mad(msg, NULL)) 2870 cm_free_response_msg(msg); 2871 goto deref; 2872 case IB_CM_DREQ_RCVD: 2873 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 2874 [CM_DREQ_COUNTER]); 2875 goto unlock; 2876 default: 2877 trace_icm_dreq_unknown_err(&cm_id_priv->id); 2878 goto unlock; 2879 } 2880 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2881 cm_id_priv->tid = dreq_msg->hdr.tid; 2882 cm_queue_work_unlock(cm_id_priv, work); 2883 return 0; 2884 2885 unlock: spin_unlock_irq(&cm_id_priv->lock); 2886 deref: cm_deref_id(cm_id_priv); 2887 return -EINVAL; 2888 } 2889 2890 static int cm_drep_handler(struct cm_work *work) 2891 { 2892 struct cm_id_private *cm_id_priv; 2893 struct cm_drep_msg *drep_msg; 2894 2895 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2896 cm_id_priv = cm_acquire_id( 2897 cpu_to_be32(IBA_GET(CM_DREP_REMOTE_COMM_ID, drep_msg)), 2898 cpu_to_be32(IBA_GET(CM_DREP_LOCAL_COMM_ID, drep_msg))); 2899 if (!cm_id_priv) 2900 return -EINVAL; 2901 2902 work->cm_event.private_data = 2903 IBA_GET_MEM_PTR(CM_DREP_PRIVATE_DATA, drep_msg); 2904 2905 spin_lock_irq(&cm_id_priv->lock); 2906 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2907 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2908 spin_unlock_irq(&cm_id_priv->lock); 2909 goto out; 2910 } 2911 cm_enter_timewait(cm_id_priv); 2912 2913 ib_cancel_mad(cm_id_priv->msg); 2914 cm_queue_work_unlock(cm_id_priv, work); 2915 return 0; 2916 out: 2917 cm_deref_id(cm_id_priv); 2918 return -EINVAL; 2919 } 2920 2921 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv, 2922 enum ib_cm_rej_reason reason, void *ari, 2923 u8 ari_length, const void *private_data, 2924 u8 private_data_len) 2925 { 2926 enum ib_cm_state state = cm_id_priv->id.state; 2927 struct ib_mad_send_buf *msg; 2928 int ret; 2929 2930 lockdep_assert_held(&cm_id_priv->lock); 2931 2932 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2933 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2934 return -EINVAL; 2935 2936 trace_icm_send_rej(&cm_id_priv->id, reason); 2937 2938 switch (state) { 2939 case IB_CM_REQ_SENT: 2940 case IB_CM_MRA_REQ_RCVD: 2941 case IB_CM_REQ_RCVD: 2942 case IB_CM_MRA_REQ_SENT: 2943 case IB_CM_REP_RCVD: 2944 case IB_CM_MRA_REP_SENT: 2945 cm_reset_to_idle(cm_id_priv); 2946 msg = cm_alloc_msg(cm_id_priv); 2947 if (IS_ERR(msg)) 2948 return PTR_ERR(msg); 2949 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason, 2950 ari, ari_length, private_data, private_data_len, 2951 state); 2952 break; 2953 case IB_CM_REP_SENT: 2954 case IB_CM_MRA_REP_RCVD: 2955 cm_enter_timewait(cm_id_priv); 2956 msg = cm_alloc_msg(cm_id_priv); 2957 if (IS_ERR(msg)) 2958 return PTR_ERR(msg); 2959 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason, 2960 ari, ari_length, private_data, private_data_len, 2961 state); 2962 break; 2963 default: 2964 trace_icm_send_unknown_rej_err(&cm_id_priv->id); 2965 return -EINVAL; 2966 } 2967 2968 ret = ib_post_send_mad(msg, NULL); 2969 if (ret) { 2970 cm_free_msg(msg); 2971 return ret; 2972 } 2973 2974 return 0; 2975 } 2976 2977 int ib_send_cm_rej(struct ib_cm_id *cm_id, enum ib_cm_rej_reason reason, 2978 void *ari, u8 ari_length, const void *private_data, 2979 u8 private_data_len) 2980 { 2981 struct cm_id_private *cm_id_priv = 2982 container_of(cm_id, struct cm_id_private, id); 2983 unsigned long flags; 2984 int ret; 2985 2986 spin_lock_irqsave(&cm_id_priv->lock, flags); 2987 ret = cm_send_rej_locked(cm_id_priv, reason, ari, ari_length, 2988 private_data, private_data_len); 2989 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2990 return ret; 2991 } 2992 EXPORT_SYMBOL(ib_send_cm_rej); 2993 2994 static void cm_format_rej_event(struct cm_work *work) 2995 { 2996 struct cm_rej_msg *rej_msg; 2997 struct ib_cm_rej_event_param *param; 2998 2999 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 3000 param = &work->cm_event.param.rej_rcvd; 3001 param->ari = IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg); 3002 param->ari_length = IBA_GET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg); 3003 param->reason = IBA_GET(CM_REJ_REASON, rej_msg); 3004 work->cm_event.private_data = 3005 IBA_GET_MEM_PTR(CM_REJ_PRIVATE_DATA, rej_msg); 3006 } 3007 3008 static struct cm_id_private *cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 3009 { 3010 struct cm_id_private *cm_id_priv; 3011 __be32 remote_id; 3012 3013 remote_id = cpu_to_be32(IBA_GET(CM_REJ_LOCAL_COMM_ID, rej_msg)); 3014 3015 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_TIMEOUT) { 3016 cm_id_priv = cm_find_remote_id( 3017 *((__be64 *)IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg)), 3018 remote_id); 3019 } else if (IBA_GET(CM_REJ_MESSAGE_REJECTED, rej_msg) == 3020 CM_MSG_RESPONSE_REQ) 3021 cm_id_priv = cm_acquire_id( 3022 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)), 3023 0); 3024 else 3025 cm_id_priv = cm_acquire_id( 3026 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)), 3027 remote_id); 3028 3029 return cm_id_priv; 3030 } 3031 3032 static int cm_rej_handler(struct cm_work *work) 3033 { 3034 struct cm_id_private *cm_id_priv; 3035 struct cm_rej_msg *rej_msg; 3036 3037 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 3038 cm_id_priv = cm_acquire_rejected_id(rej_msg); 3039 if (!cm_id_priv) 3040 return -EINVAL; 3041 3042 cm_format_rej_event(work); 3043 3044 spin_lock_irq(&cm_id_priv->lock); 3045 switch (cm_id_priv->id.state) { 3046 case IB_CM_REQ_SENT: 3047 case IB_CM_MRA_REQ_RCVD: 3048 case IB_CM_REP_SENT: 3049 case IB_CM_MRA_REP_RCVD: 3050 ib_cancel_mad(cm_id_priv->msg); 3051 fallthrough; 3052 case IB_CM_REQ_RCVD: 3053 case IB_CM_MRA_REQ_SENT: 3054 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_STALE_CONN) 3055 cm_enter_timewait(cm_id_priv); 3056 else 3057 cm_reset_to_idle(cm_id_priv); 3058 break; 3059 case IB_CM_DREQ_SENT: 3060 ib_cancel_mad(cm_id_priv->msg); 3061 fallthrough; 3062 case IB_CM_REP_RCVD: 3063 case IB_CM_MRA_REP_SENT: 3064 cm_enter_timewait(cm_id_priv); 3065 break; 3066 case IB_CM_ESTABLISHED: 3067 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT || 3068 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) { 3069 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT) 3070 ib_cancel_mad(cm_id_priv->msg); 3071 cm_enter_timewait(cm_id_priv); 3072 break; 3073 } 3074 fallthrough; 3075 default: 3076 trace_icm_rej_unknown_err(&cm_id_priv->id); 3077 spin_unlock_irq(&cm_id_priv->lock); 3078 goto out; 3079 } 3080 3081 cm_queue_work_unlock(cm_id_priv, work); 3082 return 0; 3083 out: 3084 cm_deref_id(cm_id_priv); 3085 return -EINVAL; 3086 } 3087 3088 int ib_send_cm_mra(struct ib_cm_id *cm_id, 3089 u8 service_timeout, 3090 const void *private_data, 3091 u8 private_data_len) 3092 { 3093 struct cm_id_private *cm_id_priv; 3094 struct ib_mad_send_buf *msg; 3095 enum ib_cm_state cm_state; 3096 enum ib_cm_lap_state lap_state; 3097 enum cm_msg_response msg_response; 3098 void *data; 3099 unsigned long flags; 3100 int ret; 3101 3102 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 3103 return -EINVAL; 3104 3105 data = cm_copy_private_data(private_data, private_data_len); 3106 if (IS_ERR(data)) 3107 return PTR_ERR(data); 3108 3109 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3110 3111 spin_lock_irqsave(&cm_id_priv->lock, flags); 3112 switch (cm_id_priv->id.state) { 3113 case IB_CM_REQ_RCVD: 3114 cm_state = IB_CM_MRA_REQ_SENT; 3115 lap_state = cm_id->lap_state; 3116 msg_response = CM_MSG_RESPONSE_REQ; 3117 break; 3118 case IB_CM_REP_RCVD: 3119 cm_state = IB_CM_MRA_REP_SENT; 3120 lap_state = cm_id->lap_state; 3121 msg_response = CM_MSG_RESPONSE_REP; 3122 break; 3123 case IB_CM_ESTABLISHED: 3124 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 3125 cm_state = cm_id->state; 3126 lap_state = IB_CM_MRA_LAP_SENT; 3127 msg_response = CM_MSG_RESPONSE_OTHER; 3128 break; 3129 } 3130 fallthrough; 3131 default: 3132 trace_icm_send_mra_unknown_err(&cm_id_priv->id); 3133 ret = -EINVAL; 3134 goto error_unlock; 3135 } 3136 3137 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 3138 msg = cm_alloc_msg(cm_id_priv); 3139 if (IS_ERR(msg)) { 3140 ret = PTR_ERR(msg); 3141 goto error_unlock; 3142 } 3143 3144 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 3145 msg_response, service_timeout, 3146 private_data, private_data_len); 3147 trace_icm_send_mra(cm_id); 3148 ret = ib_post_send_mad(msg, NULL); 3149 if (ret) 3150 goto error_free_msg; 3151 } 3152 3153 cm_id->state = cm_state; 3154 cm_id->lap_state = lap_state; 3155 cm_id_priv->service_timeout = service_timeout; 3156 cm_set_private_data(cm_id_priv, data, private_data_len); 3157 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3158 return 0; 3159 3160 error_free_msg: 3161 cm_free_msg(msg); 3162 error_unlock: 3163 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3164 kfree(data); 3165 return ret; 3166 } 3167 EXPORT_SYMBOL(ib_send_cm_mra); 3168 3169 static struct cm_id_private *cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 3170 { 3171 switch (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg)) { 3172 case CM_MSG_RESPONSE_REQ: 3173 return cm_acquire_id( 3174 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)), 3175 0); 3176 case CM_MSG_RESPONSE_REP: 3177 case CM_MSG_RESPONSE_OTHER: 3178 return cm_acquire_id( 3179 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)), 3180 cpu_to_be32(IBA_GET(CM_MRA_LOCAL_COMM_ID, mra_msg))); 3181 default: 3182 return NULL; 3183 } 3184 } 3185 3186 static int cm_mra_handler(struct cm_work *work) 3187 { 3188 struct cm_id_private *cm_id_priv; 3189 struct cm_mra_msg *mra_msg; 3190 int timeout; 3191 3192 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 3193 cm_id_priv = cm_acquire_mraed_id(mra_msg); 3194 if (!cm_id_priv) 3195 return -EINVAL; 3196 3197 work->cm_event.private_data = 3198 IBA_GET_MEM_PTR(CM_MRA_PRIVATE_DATA, mra_msg); 3199 work->cm_event.param.mra_rcvd.service_timeout = 3200 IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg); 3201 timeout = cm_convert_to_ms(IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg)) + 3202 cm_convert_to_ms(cm_id_priv->av.timeout); 3203 3204 spin_lock_irq(&cm_id_priv->lock); 3205 switch (cm_id_priv->id.state) { 3206 case IB_CM_REQ_SENT: 3207 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != 3208 CM_MSG_RESPONSE_REQ || 3209 ib_modify_mad(cm_id_priv->msg, timeout)) 3210 goto out; 3211 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 3212 break; 3213 case IB_CM_REP_SENT: 3214 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != 3215 CM_MSG_RESPONSE_REP || 3216 ib_modify_mad(cm_id_priv->msg, timeout)) 3217 goto out; 3218 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 3219 break; 3220 case IB_CM_ESTABLISHED: 3221 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != 3222 CM_MSG_RESPONSE_OTHER || 3223 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 3224 ib_modify_mad(cm_id_priv->msg, timeout)) { 3225 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 3226 atomic_long_inc( 3227 &work->port->counters[CM_RECV_DUPLICATES] 3228 [CM_MRA_COUNTER]); 3229 goto out; 3230 } 3231 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 3232 break; 3233 case IB_CM_MRA_REQ_RCVD: 3234 case IB_CM_MRA_REP_RCVD: 3235 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 3236 [CM_MRA_COUNTER]); 3237 fallthrough; 3238 default: 3239 trace_icm_mra_unknown_err(&cm_id_priv->id); 3240 goto out; 3241 } 3242 3243 cm_id_priv->msg->context[1] = (void *) (unsigned long) 3244 cm_id_priv->id.state; 3245 cm_queue_work_unlock(cm_id_priv, work); 3246 return 0; 3247 out: 3248 spin_unlock_irq(&cm_id_priv->lock); 3249 cm_deref_id(cm_id_priv); 3250 return -EINVAL; 3251 } 3252 3253 static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg, 3254 struct sa_path_rec *path) 3255 { 3256 u32 lid; 3257 3258 if (path->rec_type != SA_PATH_REC_TYPE_OPA) { 3259 sa_path_set_dlid(path, IBA_GET(CM_LAP_ALTERNATE_LOCAL_PORT_LID, 3260 lap_msg)); 3261 sa_path_set_slid(path, IBA_GET(CM_LAP_ALTERNATE_REMOTE_PORT_LID, 3262 lap_msg)); 3263 } else { 3264 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 3265 CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg)); 3266 sa_path_set_dlid(path, lid); 3267 3268 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 3269 CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg)); 3270 sa_path_set_slid(path, lid); 3271 } 3272 } 3273 3274 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 3275 struct sa_path_rec *path, 3276 struct cm_lap_msg *lap_msg) 3277 { 3278 path->dgid = *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg); 3279 path->sgid = 3280 *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg); 3281 path->flow_label = 3282 cpu_to_be32(IBA_GET(CM_LAP_ALTERNATE_FLOW_LABEL, lap_msg)); 3283 path->hop_limit = IBA_GET(CM_LAP_ALTERNATE_HOP_LIMIT, lap_msg); 3284 path->traffic_class = IBA_GET(CM_LAP_ALTERNATE_TRAFFIC_CLASS, lap_msg); 3285 path->reversible = 1; 3286 path->pkey = cm_id_priv->pkey; 3287 path->sl = IBA_GET(CM_LAP_ALTERNATE_SL, lap_msg); 3288 path->mtu_selector = IB_SA_EQ; 3289 path->mtu = cm_id_priv->path_mtu; 3290 path->rate_selector = IB_SA_EQ; 3291 path->rate = IBA_GET(CM_LAP_ALTERNATE_PACKET_RATE, lap_msg); 3292 path->packet_life_time_selector = IB_SA_EQ; 3293 path->packet_life_time = 3294 IBA_GET(CM_LAP_ALTERNATE_LOCAL_ACK_TIMEOUT, lap_msg); 3295 path->packet_life_time -= (path->packet_life_time > 0); 3296 cm_format_path_lid_from_lap(lap_msg, path); 3297 } 3298 3299 static int cm_lap_handler(struct cm_work *work) 3300 { 3301 struct cm_id_private *cm_id_priv; 3302 struct cm_lap_msg *lap_msg; 3303 struct ib_cm_lap_event_param *param; 3304 struct ib_mad_send_buf *msg = NULL; 3305 struct rdma_ah_attr ah_attr; 3306 struct cm_av alt_av = {}; 3307 int ret; 3308 3309 /* Currently Alternate path messages are not supported for 3310 * RoCE link layer. 3311 */ 3312 if (rdma_protocol_roce(work->port->cm_dev->ib_device, 3313 work->port->port_num)) 3314 return -EINVAL; 3315 3316 /* todo: verify LAP request and send reject APR if invalid. */ 3317 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 3318 cm_id_priv = cm_acquire_id( 3319 cpu_to_be32(IBA_GET(CM_LAP_REMOTE_COMM_ID, lap_msg)), 3320 cpu_to_be32(IBA_GET(CM_LAP_LOCAL_COMM_ID, lap_msg))); 3321 if (!cm_id_priv) 3322 return -EINVAL; 3323 3324 param = &work->cm_event.param.lap_rcvd; 3325 memset(&work->path[0], 0, sizeof(work->path[1])); 3326 cm_path_set_rec_type(work->port->cm_dev->ib_device, 3327 work->port->port_num, &work->path[0], 3328 IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, 3329 lap_msg)); 3330 param->alternate_path = &work->path[0]; 3331 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 3332 work->cm_event.private_data = 3333 IBA_GET_MEM_PTR(CM_LAP_PRIVATE_DATA, lap_msg); 3334 3335 ret = ib_init_ah_attr_from_wc(work->port->cm_dev->ib_device, 3336 work->port->port_num, 3337 work->mad_recv_wc->wc, 3338 work->mad_recv_wc->recv_buf.grh, 3339 &ah_attr); 3340 if (ret) 3341 goto deref; 3342 3343 ret = cm_init_av_by_path(param->alternate_path, NULL, &alt_av); 3344 if (ret) { 3345 rdma_destroy_ah_attr(&ah_attr); 3346 goto deref; 3347 } 3348 3349 spin_lock_irq(&cm_id_priv->lock); 3350 cm_init_av_for_lap(work->port, work->mad_recv_wc->wc, 3351 &ah_attr, &cm_id_priv->av); 3352 cm_move_av_from_path(&cm_id_priv->alt_av, &alt_av); 3353 3354 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 3355 goto unlock; 3356 3357 switch (cm_id_priv->id.lap_state) { 3358 case IB_CM_LAP_UNINIT: 3359 case IB_CM_LAP_IDLE: 3360 break; 3361 case IB_CM_MRA_LAP_SENT: 3362 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 3363 [CM_LAP_COUNTER]); 3364 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc); 3365 if (IS_ERR(msg)) 3366 goto unlock; 3367 3368 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 3369 CM_MSG_RESPONSE_OTHER, 3370 cm_id_priv->service_timeout, 3371 cm_id_priv->private_data, 3372 cm_id_priv->private_data_len); 3373 spin_unlock_irq(&cm_id_priv->lock); 3374 3375 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || 3376 ib_post_send_mad(msg, NULL)) 3377 cm_free_response_msg(msg); 3378 goto deref; 3379 case IB_CM_LAP_RCVD: 3380 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 3381 [CM_LAP_COUNTER]); 3382 goto unlock; 3383 default: 3384 goto unlock; 3385 } 3386 3387 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 3388 cm_id_priv->tid = lap_msg->hdr.tid; 3389 cm_queue_work_unlock(cm_id_priv, work); 3390 return 0; 3391 3392 unlock: spin_unlock_irq(&cm_id_priv->lock); 3393 deref: cm_deref_id(cm_id_priv); 3394 return -EINVAL; 3395 } 3396 3397 static int cm_apr_handler(struct cm_work *work) 3398 { 3399 struct cm_id_private *cm_id_priv; 3400 struct cm_apr_msg *apr_msg; 3401 3402 /* Currently Alternate path messages are not supported for 3403 * RoCE link layer. 3404 */ 3405 if (rdma_protocol_roce(work->port->cm_dev->ib_device, 3406 work->port->port_num)) 3407 return -EINVAL; 3408 3409 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 3410 cm_id_priv = cm_acquire_id( 3411 cpu_to_be32(IBA_GET(CM_APR_REMOTE_COMM_ID, apr_msg)), 3412 cpu_to_be32(IBA_GET(CM_APR_LOCAL_COMM_ID, apr_msg))); 3413 if (!cm_id_priv) 3414 return -EINVAL; /* Unmatched reply. */ 3415 3416 work->cm_event.param.apr_rcvd.ap_status = 3417 IBA_GET(CM_APR_AR_STATUS, apr_msg); 3418 work->cm_event.param.apr_rcvd.apr_info = 3419 IBA_GET_MEM_PTR(CM_APR_ADDITIONAL_INFORMATION, apr_msg); 3420 work->cm_event.param.apr_rcvd.info_len = 3421 IBA_GET(CM_APR_ADDITIONAL_INFORMATION_LENGTH, apr_msg); 3422 work->cm_event.private_data = 3423 IBA_GET_MEM_PTR(CM_APR_PRIVATE_DATA, apr_msg); 3424 3425 spin_lock_irq(&cm_id_priv->lock); 3426 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 3427 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 3428 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 3429 spin_unlock_irq(&cm_id_priv->lock); 3430 goto out; 3431 } 3432 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 3433 ib_cancel_mad(cm_id_priv->msg); 3434 cm_queue_work_unlock(cm_id_priv, work); 3435 return 0; 3436 out: 3437 cm_deref_id(cm_id_priv); 3438 return -EINVAL; 3439 } 3440 3441 static int cm_timewait_handler(struct cm_work *work) 3442 { 3443 struct cm_timewait_info *timewait_info; 3444 struct cm_id_private *cm_id_priv; 3445 3446 timewait_info = container_of(work, struct cm_timewait_info, work); 3447 spin_lock_irq(&cm.lock); 3448 list_del(&timewait_info->list); 3449 spin_unlock_irq(&cm.lock); 3450 3451 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 3452 timewait_info->work.remote_id); 3453 if (!cm_id_priv) 3454 return -EINVAL; 3455 3456 spin_lock_irq(&cm_id_priv->lock); 3457 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 3458 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 3459 spin_unlock_irq(&cm_id_priv->lock); 3460 goto out; 3461 } 3462 cm_id_priv->id.state = IB_CM_IDLE; 3463 cm_queue_work_unlock(cm_id_priv, work); 3464 return 0; 3465 out: 3466 cm_deref_id(cm_id_priv); 3467 return -EINVAL; 3468 } 3469 3470 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 3471 struct cm_id_private *cm_id_priv, 3472 struct ib_cm_sidr_req_param *param) 3473 { 3474 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 3475 cm_form_tid(cm_id_priv)); 3476 IBA_SET(CM_SIDR_REQ_REQUESTID, sidr_req_msg, 3477 be32_to_cpu(cm_id_priv->id.local_id)); 3478 IBA_SET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg, 3479 be16_to_cpu(param->path->pkey)); 3480 IBA_SET(CM_SIDR_REQ_SERVICEID, sidr_req_msg, 3481 be64_to_cpu(param->service_id)); 3482 3483 if (param->private_data && param->private_data_len) 3484 IBA_SET_MEM(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg, 3485 param->private_data, param->private_data_len); 3486 } 3487 3488 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 3489 struct ib_cm_sidr_req_param *param) 3490 { 3491 struct cm_id_private *cm_id_priv; 3492 struct ib_mad_send_buf *msg; 3493 struct cm_av av = {}; 3494 unsigned long flags; 3495 int ret; 3496 3497 if (!param->path || (param->private_data && 3498 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 3499 return -EINVAL; 3500 3501 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3502 ret = cm_init_av_by_path(param->path, param->sgid_attr, &av); 3503 if (ret) 3504 return ret; 3505 3506 spin_lock_irqsave(&cm_id_priv->lock, flags); 3507 cm_move_av_from_path(&cm_id_priv->av, &av); 3508 cm_id->service_id = param->service_id; 3509 cm_id_priv->timeout_ms = param->timeout_ms; 3510 cm_id_priv->max_cm_retries = param->max_cm_retries; 3511 if (cm_id->state != IB_CM_IDLE) { 3512 ret = -EINVAL; 3513 goto out_unlock; 3514 } 3515 3516 msg = cm_alloc_priv_msg(cm_id_priv); 3517 if (IS_ERR(msg)) { 3518 ret = PTR_ERR(msg); 3519 goto out_unlock; 3520 } 3521 3522 cm_format_sidr_req((struct cm_sidr_req_msg *)msg->mad, cm_id_priv, 3523 param); 3524 msg->timeout_ms = cm_id_priv->timeout_ms; 3525 msg->context[1] = (void *)(unsigned long)IB_CM_SIDR_REQ_SENT; 3526 3527 trace_icm_send_sidr_req(&cm_id_priv->id); 3528 ret = ib_post_send_mad(msg, NULL); 3529 if (ret) 3530 goto out_free; 3531 cm_id->state = IB_CM_SIDR_REQ_SENT; 3532 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3533 return 0; 3534 out_free: 3535 cm_free_priv_msg(msg); 3536 out_unlock: 3537 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3538 return ret; 3539 } 3540 EXPORT_SYMBOL(ib_send_cm_sidr_req); 3541 3542 static void cm_format_sidr_req_event(struct cm_work *work, 3543 const struct cm_id_private *rx_cm_id, 3544 struct ib_cm_id *listen_id) 3545 { 3546 struct cm_sidr_req_msg *sidr_req_msg; 3547 struct ib_cm_sidr_req_event_param *param; 3548 3549 sidr_req_msg = (struct cm_sidr_req_msg *) 3550 work->mad_recv_wc->recv_buf.mad; 3551 param = &work->cm_event.param.sidr_req_rcvd; 3552 param->pkey = IBA_GET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg); 3553 param->listen_id = listen_id; 3554 param->service_id = 3555 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg)); 3556 param->bth_pkey = cm_get_bth_pkey(work); 3557 param->port = work->port->port_num; 3558 param->sgid_attr = rx_cm_id->av.ah_attr.grh.sgid_attr; 3559 work->cm_event.private_data = 3560 IBA_GET_MEM_PTR(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg); 3561 } 3562 3563 static int cm_sidr_req_handler(struct cm_work *work) 3564 { 3565 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 3566 struct cm_sidr_req_msg *sidr_req_msg; 3567 struct ib_wc *wc; 3568 int ret; 3569 3570 cm_id_priv = 3571 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL); 3572 if (IS_ERR(cm_id_priv)) 3573 return PTR_ERR(cm_id_priv); 3574 3575 /* Record SGID/SLID and request ID for lookup. */ 3576 sidr_req_msg = (struct cm_sidr_req_msg *) 3577 work->mad_recv_wc->recv_buf.mad; 3578 3579 cm_id_priv->id.remote_id = 3580 cpu_to_be32(IBA_GET(CM_SIDR_REQ_REQUESTID, sidr_req_msg)); 3581 cm_id_priv->id.service_id = 3582 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg)); 3583 cm_id_priv->tid = sidr_req_msg->hdr.tid; 3584 3585 wc = work->mad_recv_wc->wc; 3586 cm_id_priv->sidr_slid = wc->slid; 3587 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 3588 work->mad_recv_wc->recv_buf.grh, 3589 &cm_id_priv->av); 3590 if (ret) 3591 goto out; 3592 3593 spin_lock_irq(&cm.lock); 3594 listen_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 3595 if (listen_cm_id_priv) { 3596 spin_unlock_irq(&cm.lock); 3597 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 3598 [CM_SIDR_REQ_COUNTER]); 3599 goto out; /* Duplicate message. */ 3600 } 3601 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3602 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 3603 cm_id_priv->id.service_id); 3604 if (!listen_cm_id_priv) { 3605 spin_unlock_irq(&cm.lock); 3606 ib_send_cm_sidr_rep(&cm_id_priv->id, 3607 &(struct ib_cm_sidr_rep_param){ 3608 .status = IB_SIDR_UNSUPPORTED }); 3609 goto out; /* No match. */ 3610 } 3611 spin_unlock_irq(&cm.lock); 3612 3613 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 3614 cm_id_priv->id.context = listen_cm_id_priv->id.context; 3615 3616 /* 3617 * A SIDR ID does not need to be in the xarray since it does not receive 3618 * mads, is not placed in the remote_id or remote_qpn rbtree, and does 3619 * not enter timewait. 3620 */ 3621 3622 cm_format_sidr_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 3623 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 3624 cm_free_work(work); 3625 /* 3626 * A pointer to the listen_cm_id is held in the event, so this deref 3627 * must be after the event is delivered above. 3628 */ 3629 cm_deref_id(listen_cm_id_priv); 3630 if (ret) 3631 cm_destroy_id(&cm_id_priv->id, ret); 3632 return 0; 3633 out: 3634 ib_destroy_cm_id(&cm_id_priv->id); 3635 return -EINVAL; 3636 } 3637 3638 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3639 struct cm_id_private *cm_id_priv, 3640 struct ib_cm_sidr_rep_param *param) 3641 { 3642 cm_format_mad_ece_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3643 cm_id_priv->tid, param->ece.attr_mod); 3644 IBA_SET(CM_SIDR_REP_REQUESTID, sidr_rep_msg, 3645 be32_to_cpu(cm_id_priv->id.remote_id)); 3646 IBA_SET(CM_SIDR_REP_STATUS, sidr_rep_msg, param->status); 3647 IBA_SET(CM_SIDR_REP_QPN, sidr_rep_msg, param->qp_num); 3648 IBA_SET(CM_SIDR_REP_SERVICEID, sidr_rep_msg, 3649 be64_to_cpu(cm_id_priv->id.service_id)); 3650 IBA_SET(CM_SIDR_REP_Q_KEY, sidr_rep_msg, param->qkey); 3651 IBA_SET(CM_SIDR_REP_VENDOR_ID_L, sidr_rep_msg, 3652 param->ece.vendor_id & 0xFF); 3653 IBA_SET(CM_SIDR_REP_VENDOR_ID_H, sidr_rep_msg, 3654 (param->ece.vendor_id >> 8) & 0xFF); 3655 3656 if (param->info && param->info_length) 3657 IBA_SET_MEM(CM_SIDR_REP_ADDITIONAL_INFORMATION, sidr_rep_msg, 3658 param->info, param->info_length); 3659 3660 if (param->private_data && param->private_data_len) 3661 IBA_SET_MEM(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg, 3662 param->private_data, param->private_data_len); 3663 } 3664 3665 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv, 3666 struct ib_cm_sidr_rep_param *param) 3667 { 3668 struct ib_mad_send_buf *msg; 3669 unsigned long flags; 3670 int ret; 3671 3672 lockdep_assert_held(&cm_id_priv->lock); 3673 3674 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3675 (param->private_data && 3676 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3677 return -EINVAL; 3678 3679 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_RCVD) 3680 return -EINVAL; 3681 3682 msg = cm_alloc_msg(cm_id_priv); 3683 if (IS_ERR(msg)) 3684 return PTR_ERR(msg); 3685 3686 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3687 param); 3688 trace_icm_send_sidr_rep(&cm_id_priv->id); 3689 ret = ib_post_send_mad(msg, NULL); 3690 if (ret) { 3691 cm_free_msg(msg); 3692 return ret; 3693 } 3694 cm_id_priv->id.state = IB_CM_IDLE; 3695 spin_lock_irqsave(&cm.lock, flags); 3696 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) { 3697 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3698 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); 3699 } 3700 spin_unlock_irqrestore(&cm.lock, flags); 3701 return 0; 3702 } 3703 3704 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3705 struct ib_cm_sidr_rep_param *param) 3706 { 3707 struct cm_id_private *cm_id_priv = 3708 container_of(cm_id, struct cm_id_private, id); 3709 unsigned long flags; 3710 int ret; 3711 3712 spin_lock_irqsave(&cm_id_priv->lock, flags); 3713 ret = cm_send_sidr_rep_locked(cm_id_priv, param); 3714 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3715 return ret; 3716 } 3717 EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3718 3719 static void cm_format_sidr_rep_event(struct cm_work *work, 3720 const struct cm_id_private *cm_id_priv) 3721 { 3722 struct cm_sidr_rep_msg *sidr_rep_msg; 3723 struct ib_cm_sidr_rep_event_param *param; 3724 3725 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3726 work->mad_recv_wc->recv_buf.mad; 3727 param = &work->cm_event.param.sidr_rep_rcvd; 3728 param->status = IBA_GET(CM_SIDR_REP_STATUS, sidr_rep_msg); 3729 param->qkey = IBA_GET(CM_SIDR_REP_Q_KEY, sidr_rep_msg); 3730 param->qpn = IBA_GET(CM_SIDR_REP_QPN, sidr_rep_msg); 3731 param->info = IBA_GET_MEM_PTR(CM_SIDR_REP_ADDITIONAL_INFORMATION, 3732 sidr_rep_msg); 3733 param->info_len = IBA_GET(CM_SIDR_REP_ADDITIONAL_INFORMATION_LENGTH, 3734 sidr_rep_msg); 3735 param->sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr; 3736 work->cm_event.private_data = 3737 IBA_GET_MEM_PTR(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg); 3738 } 3739 3740 static int cm_sidr_rep_handler(struct cm_work *work) 3741 { 3742 struct cm_sidr_rep_msg *sidr_rep_msg; 3743 struct cm_id_private *cm_id_priv; 3744 3745 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3746 work->mad_recv_wc->recv_buf.mad; 3747 cm_id_priv = cm_acquire_id( 3748 cpu_to_be32(IBA_GET(CM_SIDR_REP_REQUESTID, sidr_rep_msg)), 0); 3749 if (!cm_id_priv) 3750 return -EINVAL; /* Unmatched reply. */ 3751 3752 spin_lock_irq(&cm_id_priv->lock); 3753 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3754 spin_unlock_irq(&cm_id_priv->lock); 3755 goto out; 3756 } 3757 cm_id_priv->id.state = IB_CM_IDLE; 3758 ib_cancel_mad(cm_id_priv->msg); 3759 spin_unlock_irq(&cm_id_priv->lock); 3760 3761 cm_format_sidr_rep_event(work, cm_id_priv); 3762 cm_process_work(cm_id_priv, work); 3763 return 0; 3764 out: 3765 cm_deref_id(cm_id_priv); 3766 return -EINVAL; 3767 } 3768 3769 static void cm_process_send_error(struct cm_id_private *cm_id_priv, 3770 struct ib_mad_send_buf *msg, 3771 enum ib_cm_state state, 3772 enum ib_wc_status wc_status) 3773 { 3774 struct ib_cm_event cm_event = {}; 3775 int ret; 3776 3777 /* Discard old sends or ones without a response. */ 3778 spin_lock_irq(&cm_id_priv->lock); 3779 if (msg != cm_id_priv->msg) { 3780 spin_unlock_irq(&cm_id_priv->lock); 3781 cm_free_msg(msg); 3782 return; 3783 } 3784 cm_free_priv_msg(msg); 3785 3786 if (state != cm_id_priv->id.state || wc_status == IB_WC_SUCCESS || 3787 wc_status == IB_WC_WR_FLUSH_ERR) 3788 goto out_unlock; 3789 3790 trace_icm_mad_send_err(state, wc_status); 3791 switch (state) { 3792 case IB_CM_REQ_SENT: 3793 case IB_CM_MRA_REQ_RCVD: 3794 cm_reset_to_idle(cm_id_priv); 3795 cm_event.event = IB_CM_REQ_ERROR; 3796 break; 3797 case IB_CM_REP_SENT: 3798 case IB_CM_MRA_REP_RCVD: 3799 cm_reset_to_idle(cm_id_priv); 3800 cm_event.event = IB_CM_REP_ERROR; 3801 break; 3802 case IB_CM_DREQ_SENT: 3803 cm_enter_timewait(cm_id_priv); 3804 cm_event.event = IB_CM_DREQ_ERROR; 3805 break; 3806 case IB_CM_SIDR_REQ_SENT: 3807 cm_id_priv->id.state = IB_CM_IDLE; 3808 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3809 break; 3810 default: 3811 goto out_unlock; 3812 } 3813 spin_unlock_irq(&cm_id_priv->lock); 3814 cm_event.param.send_status = wc_status; 3815 3816 /* No other events can occur on the cm_id at this point. */ 3817 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3818 if (ret) 3819 ib_destroy_cm_id(&cm_id_priv->id); 3820 return; 3821 out_unlock: 3822 spin_unlock_irq(&cm_id_priv->lock); 3823 } 3824 3825 static void cm_send_handler(struct ib_mad_agent *mad_agent, 3826 struct ib_mad_send_wc *mad_send_wc) 3827 { 3828 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3829 struct cm_id_private *cm_id_priv = msg->context[0]; 3830 enum ib_cm_state state = 3831 (enum ib_cm_state)(unsigned long)msg->context[1]; 3832 struct cm_port *port; 3833 u16 attr_index; 3834 3835 port = mad_agent->context; 3836 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3837 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3838 3839 /* 3840 * If the send was in response to a received message (context[0] is not 3841 * set to a cm_id), and is not a REJ, then it is a send that was 3842 * manually retried. 3843 */ 3844 if (!cm_id_priv && (attr_index != CM_REJ_COUNTER)) 3845 msg->retries = 1; 3846 3847 atomic_long_add(1 + msg->retries, &port->counters[CM_XMIT][attr_index]); 3848 if (msg->retries) 3849 atomic_long_add(msg->retries, 3850 &port->counters[CM_XMIT_RETRIES][attr_index]); 3851 3852 if (cm_id_priv) 3853 cm_process_send_error(cm_id_priv, msg, state, 3854 mad_send_wc->status); 3855 else 3856 cm_free_response_msg(msg); 3857 } 3858 3859 static void cm_work_handler(struct work_struct *_work) 3860 { 3861 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3862 int ret; 3863 3864 switch (work->cm_event.event) { 3865 case IB_CM_REQ_RECEIVED: 3866 ret = cm_req_handler(work); 3867 break; 3868 case IB_CM_MRA_RECEIVED: 3869 ret = cm_mra_handler(work); 3870 break; 3871 case IB_CM_REJ_RECEIVED: 3872 ret = cm_rej_handler(work); 3873 break; 3874 case IB_CM_REP_RECEIVED: 3875 ret = cm_rep_handler(work); 3876 break; 3877 case IB_CM_RTU_RECEIVED: 3878 ret = cm_rtu_handler(work); 3879 break; 3880 case IB_CM_USER_ESTABLISHED: 3881 ret = cm_establish_handler(work); 3882 break; 3883 case IB_CM_DREQ_RECEIVED: 3884 ret = cm_dreq_handler(work); 3885 break; 3886 case IB_CM_DREP_RECEIVED: 3887 ret = cm_drep_handler(work); 3888 break; 3889 case IB_CM_SIDR_REQ_RECEIVED: 3890 ret = cm_sidr_req_handler(work); 3891 break; 3892 case IB_CM_SIDR_REP_RECEIVED: 3893 ret = cm_sidr_rep_handler(work); 3894 break; 3895 case IB_CM_LAP_RECEIVED: 3896 ret = cm_lap_handler(work); 3897 break; 3898 case IB_CM_APR_RECEIVED: 3899 ret = cm_apr_handler(work); 3900 break; 3901 case IB_CM_TIMEWAIT_EXIT: 3902 ret = cm_timewait_handler(work); 3903 break; 3904 default: 3905 trace_icm_handler_err(work->cm_event.event); 3906 ret = -EINVAL; 3907 break; 3908 } 3909 if (ret) 3910 cm_free_work(work); 3911 } 3912 3913 static int cm_establish(struct ib_cm_id *cm_id) 3914 { 3915 struct cm_id_private *cm_id_priv; 3916 struct cm_work *work; 3917 unsigned long flags; 3918 int ret = 0; 3919 struct cm_device *cm_dev; 3920 3921 cm_dev = ib_get_client_data(cm_id->device, &cm_client); 3922 if (!cm_dev) 3923 return -ENODEV; 3924 3925 work = kmalloc(sizeof *work, GFP_ATOMIC); 3926 if (!work) 3927 return -ENOMEM; 3928 3929 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3930 spin_lock_irqsave(&cm_id_priv->lock, flags); 3931 switch (cm_id->state) { 3932 case IB_CM_REP_SENT: 3933 case IB_CM_MRA_REP_RCVD: 3934 cm_id->state = IB_CM_ESTABLISHED; 3935 break; 3936 case IB_CM_ESTABLISHED: 3937 ret = -EISCONN; 3938 break; 3939 default: 3940 trace_icm_establish_err(cm_id); 3941 ret = -EINVAL; 3942 break; 3943 } 3944 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3945 3946 if (ret) { 3947 kfree(work); 3948 goto out; 3949 } 3950 3951 /* 3952 * The CM worker thread may try to destroy the cm_id before it 3953 * can execute this work item. To prevent potential deadlock, 3954 * we need to find the cm_id once we're in the context of the 3955 * worker thread, rather than holding a reference on it. 3956 */ 3957 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3958 work->local_id = cm_id->local_id; 3959 work->remote_id = cm_id->remote_id; 3960 work->mad_recv_wc = NULL; 3961 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3962 3963 /* Check if the device started its remove_one */ 3964 spin_lock_irqsave(&cm.lock, flags); 3965 if (!cm_dev->going_down) { 3966 queue_delayed_work(cm.wq, &work->work, 0); 3967 } else { 3968 kfree(work); 3969 ret = -ENODEV; 3970 } 3971 spin_unlock_irqrestore(&cm.lock, flags); 3972 3973 out: 3974 return ret; 3975 } 3976 3977 static int cm_migrate(struct ib_cm_id *cm_id) 3978 { 3979 struct cm_id_private *cm_id_priv; 3980 unsigned long flags; 3981 int ret = 0; 3982 3983 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3984 spin_lock_irqsave(&cm_id_priv->lock, flags); 3985 if (cm_id->state == IB_CM_ESTABLISHED && 3986 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3987 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3988 cm_id->lap_state = IB_CM_LAP_IDLE; 3989 cm_id_priv->av = cm_id_priv->alt_av; 3990 } else 3991 ret = -EINVAL; 3992 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3993 3994 return ret; 3995 } 3996 3997 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3998 { 3999 int ret; 4000 4001 switch (event) { 4002 case IB_EVENT_COMM_EST: 4003 ret = cm_establish(cm_id); 4004 break; 4005 case IB_EVENT_PATH_MIG: 4006 ret = cm_migrate(cm_id); 4007 break; 4008 default: 4009 ret = -EINVAL; 4010 } 4011 return ret; 4012 } 4013 EXPORT_SYMBOL(ib_cm_notify); 4014 4015 static void cm_recv_handler(struct ib_mad_agent *mad_agent, 4016 struct ib_mad_send_buf *send_buf, 4017 struct ib_mad_recv_wc *mad_recv_wc) 4018 { 4019 struct cm_port *port = mad_agent->context; 4020 struct cm_work *work; 4021 enum ib_cm_event_type event; 4022 bool alt_path = false; 4023 u16 attr_id; 4024 int paths = 0; 4025 int going_down = 0; 4026 4027 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 4028 case CM_REQ_ATTR_ID: 4029 alt_path = cm_req_has_alt_path((struct cm_req_msg *) 4030 mad_recv_wc->recv_buf.mad); 4031 paths = 1 + (alt_path != 0); 4032 event = IB_CM_REQ_RECEIVED; 4033 break; 4034 case CM_MRA_ATTR_ID: 4035 event = IB_CM_MRA_RECEIVED; 4036 break; 4037 case CM_REJ_ATTR_ID: 4038 event = IB_CM_REJ_RECEIVED; 4039 break; 4040 case CM_REP_ATTR_ID: 4041 event = IB_CM_REP_RECEIVED; 4042 break; 4043 case CM_RTU_ATTR_ID: 4044 event = IB_CM_RTU_RECEIVED; 4045 break; 4046 case CM_DREQ_ATTR_ID: 4047 event = IB_CM_DREQ_RECEIVED; 4048 break; 4049 case CM_DREP_ATTR_ID: 4050 event = IB_CM_DREP_RECEIVED; 4051 break; 4052 case CM_SIDR_REQ_ATTR_ID: 4053 event = IB_CM_SIDR_REQ_RECEIVED; 4054 break; 4055 case CM_SIDR_REP_ATTR_ID: 4056 event = IB_CM_SIDR_REP_RECEIVED; 4057 break; 4058 case CM_LAP_ATTR_ID: 4059 paths = 1; 4060 event = IB_CM_LAP_RECEIVED; 4061 break; 4062 case CM_APR_ATTR_ID: 4063 event = IB_CM_APR_RECEIVED; 4064 break; 4065 default: 4066 ib_free_recv_mad(mad_recv_wc); 4067 return; 4068 } 4069 4070 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 4071 atomic_long_inc(&port->counters[CM_RECV][attr_id - CM_ATTR_ID_OFFSET]); 4072 4073 work = kmalloc(struct_size(work, path, paths), GFP_KERNEL); 4074 if (!work) { 4075 ib_free_recv_mad(mad_recv_wc); 4076 return; 4077 } 4078 4079 INIT_DELAYED_WORK(&work->work, cm_work_handler); 4080 work->cm_event.event = event; 4081 work->mad_recv_wc = mad_recv_wc; 4082 work->port = port; 4083 4084 /* Check if the device started its remove_one */ 4085 spin_lock_irq(&cm.lock); 4086 if (!port->cm_dev->going_down) 4087 queue_delayed_work(cm.wq, &work->work, 0); 4088 else 4089 going_down = 1; 4090 spin_unlock_irq(&cm.lock); 4091 4092 if (going_down) { 4093 kfree(work); 4094 ib_free_recv_mad(mad_recv_wc); 4095 } 4096 } 4097 4098 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 4099 struct ib_qp_attr *qp_attr, 4100 int *qp_attr_mask) 4101 { 4102 unsigned long flags; 4103 int ret; 4104 4105 spin_lock_irqsave(&cm_id_priv->lock, flags); 4106 switch (cm_id_priv->id.state) { 4107 case IB_CM_REQ_SENT: 4108 case IB_CM_MRA_REQ_RCVD: 4109 case IB_CM_REQ_RCVD: 4110 case IB_CM_MRA_REQ_SENT: 4111 case IB_CM_REP_RCVD: 4112 case IB_CM_MRA_REP_SENT: 4113 case IB_CM_REP_SENT: 4114 case IB_CM_MRA_REP_RCVD: 4115 case IB_CM_ESTABLISHED: 4116 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 4117 IB_QP_PKEY_INDEX | IB_QP_PORT; 4118 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 4119 if (cm_id_priv->responder_resources) { 4120 struct ib_device *ib_dev = cm_id_priv->id.device; 4121 u64 support_flush = ib_dev->attrs.device_cap_flags & 4122 (IB_DEVICE_FLUSH_GLOBAL | IB_DEVICE_FLUSH_PERSISTENT); 4123 u32 flushable = support_flush ? 4124 (IB_ACCESS_FLUSH_GLOBAL | 4125 IB_ACCESS_FLUSH_PERSISTENT) : 0; 4126 4127 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 4128 IB_ACCESS_REMOTE_ATOMIC | 4129 flushable; 4130 } 4131 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 4132 if (cm_id_priv->av.port) 4133 qp_attr->port_num = cm_id_priv->av.port->port_num; 4134 ret = 0; 4135 break; 4136 default: 4137 trace_icm_qp_init_err(&cm_id_priv->id); 4138 ret = -EINVAL; 4139 break; 4140 } 4141 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4142 return ret; 4143 } 4144 4145 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 4146 struct ib_qp_attr *qp_attr, 4147 int *qp_attr_mask) 4148 { 4149 unsigned long flags; 4150 int ret; 4151 4152 spin_lock_irqsave(&cm_id_priv->lock, flags); 4153 switch (cm_id_priv->id.state) { 4154 case IB_CM_REQ_RCVD: 4155 case IB_CM_MRA_REQ_SENT: 4156 case IB_CM_REP_RCVD: 4157 case IB_CM_MRA_REP_SENT: 4158 case IB_CM_REP_SENT: 4159 case IB_CM_MRA_REP_RCVD: 4160 case IB_CM_ESTABLISHED: 4161 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 4162 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 4163 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 4164 if ((qp_attr->ah_attr.type == RDMA_AH_ATTR_TYPE_IB) && 4165 cm_id_priv->av.dlid_datapath && 4166 (cm_id_priv->av.dlid_datapath != 0xffff)) 4167 qp_attr->ah_attr.ib.dlid = cm_id_priv->av.dlid_datapath; 4168 qp_attr->path_mtu = cm_id_priv->path_mtu; 4169 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 4170 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 4171 if (cm_id_priv->qp_type == IB_QPT_RC || 4172 cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 4173 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 4174 IB_QP_MIN_RNR_TIMER; 4175 qp_attr->max_dest_rd_atomic = 4176 cm_id_priv->responder_resources; 4177 qp_attr->min_rnr_timer = 0; 4178 } 4179 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr) && 4180 cm_id_priv->alt_av.port) { 4181 *qp_attr_mask |= IB_QP_ALT_PATH; 4182 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 4183 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 4184 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 4185 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 4186 } 4187 ret = 0; 4188 break; 4189 default: 4190 trace_icm_qp_rtr_err(&cm_id_priv->id); 4191 ret = -EINVAL; 4192 break; 4193 } 4194 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4195 return ret; 4196 } 4197 4198 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 4199 struct ib_qp_attr *qp_attr, 4200 int *qp_attr_mask) 4201 { 4202 unsigned long flags; 4203 int ret; 4204 4205 spin_lock_irqsave(&cm_id_priv->lock, flags); 4206 switch (cm_id_priv->id.state) { 4207 /* Allow transition to RTS before sending REP */ 4208 case IB_CM_REQ_RCVD: 4209 case IB_CM_MRA_REQ_SENT: 4210 4211 case IB_CM_REP_RCVD: 4212 case IB_CM_MRA_REP_SENT: 4213 case IB_CM_REP_SENT: 4214 case IB_CM_MRA_REP_RCVD: 4215 case IB_CM_ESTABLISHED: 4216 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 4217 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 4218 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 4219 switch (cm_id_priv->qp_type) { 4220 case IB_QPT_RC: 4221 case IB_QPT_XRC_INI: 4222 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY | 4223 IB_QP_MAX_QP_RD_ATOMIC; 4224 qp_attr->retry_cnt = cm_id_priv->retry_count; 4225 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 4226 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 4227 fallthrough; 4228 case IB_QPT_XRC_TGT: 4229 *qp_attr_mask |= IB_QP_TIMEOUT; 4230 qp_attr->timeout = cm_id_priv->av.timeout; 4231 break; 4232 default: 4233 break; 4234 } 4235 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) { 4236 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 4237 qp_attr->path_mig_state = IB_MIG_REARM; 4238 } 4239 } else { 4240 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 4241 if (cm_id_priv->alt_av.port) 4242 qp_attr->alt_port_num = 4243 cm_id_priv->alt_av.port->port_num; 4244 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 4245 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 4246 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 4247 qp_attr->path_mig_state = IB_MIG_REARM; 4248 } 4249 ret = 0; 4250 break; 4251 default: 4252 trace_icm_qp_rts_err(&cm_id_priv->id); 4253 ret = -EINVAL; 4254 break; 4255 } 4256 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4257 return ret; 4258 } 4259 4260 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 4261 struct ib_qp_attr *qp_attr, 4262 int *qp_attr_mask) 4263 { 4264 struct cm_id_private *cm_id_priv; 4265 int ret; 4266 4267 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 4268 switch (qp_attr->qp_state) { 4269 case IB_QPS_INIT: 4270 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 4271 break; 4272 case IB_QPS_RTR: 4273 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 4274 break; 4275 case IB_QPS_RTS: 4276 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 4277 break; 4278 default: 4279 ret = -EINVAL; 4280 break; 4281 } 4282 return ret; 4283 } 4284 EXPORT_SYMBOL(ib_cm_init_qp_attr); 4285 4286 static ssize_t cm_show_counter(struct ib_device *ibdev, u32 port_num, 4287 struct ib_port_attribute *attr, char *buf) 4288 { 4289 struct cm_counter_attribute *cm_attr = 4290 container_of(attr, struct cm_counter_attribute, attr); 4291 struct cm_device *cm_dev = ib_get_client_data(ibdev, &cm_client); 4292 4293 if (WARN_ON(!cm_dev)) 4294 return -EINVAL; 4295 4296 return sysfs_emit( 4297 buf, "%ld\n", 4298 atomic_long_read( 4299 &cm_dev->port[port_num - 1] 4300 ->counters[cm_attr->group][cm_attr->index])); 4301 } 4302 4303 #define CM_COUNTER_ATTR(_name, _group, _index) \ 4304 { \ 4305 .attr = __ATTR(_name, 0444, cm_show_counter, NULL), \ 4306 .group = _group, .index = _index \ 4307 } 4308 4309 #define CM_COUNTER_GROUP(_group, _name) \ 4310 static struct cm_counter_attribute cm_counter_attr_##_group[] = { \ 4311 CM_COUNTER_ATTR(req, _group, CM_REQ_COUNTER), \ 4312 CM_COUNTER_ATTR(mra, _group, CM_MRA_COUNTER), \ 4313 CM_COUNTER_ATTR(rej, _group, CM_REJ_COUNTER), \ 4314 CM_COUNTER_ATTR(rep, _group, CM_REP_COUNTER), \ 4315 CM_COUNTER_ATTR(rtu, _group, CM_RTU_COUNTER), \ 4316 CM_COUNTER_ATTR(dreq, _group, CM_DREQ_COUNTER), \ 4317 CM_COUNTER_ATTR(drep, _group, CM_DREP_COUNTER), \ 4318 CM_COUNTER_ATTR(sidr_req, _group, CM_SIDR_REQ_COUNTER), \ 4319 CM_COUNTER_ATTR(sidr_rep, _group, CM_SIDR_REP_COUNTER), \ 4320 CM_COUNTER_ATTR(lap, _group, CM_LAP_COUNTER), \ 4321 CM_COUNTER_ATTR(apr, _group, CM_APR_COUNTER), \ 4322 }; \ 4323 static struct attribute *cm_counter_attrs_##_group[] = { \ 4324 &cm_counter_attr_##_group[0].attr.attr, \ 4325 &cm_counter_attr_##_group[1].attr.attr, \ 4326 &cm_counter_attr_##_group[2].attr.attr, \ 4327 &cm_counter_attr_##_group[3].attr.attr, \ 4328 &cm_counter_attr_##_group[4].attr.attr, \ 4329 &cm_counter_attr_##_group[5].attr.attr, \ 4330 &cm_counter_attr_##_group[6].attr.attr, \ 4331 &cm_counter_attr_##_group[7].attr.attr, \ 4332 &cm_counter_attr_##_group[8].attr.attr, \ 4333 &cm_counter_attr_##_group[9].attr.attr, \ 4334 &cm_counter_attr_##_group[10].attr.attr, \ 4335 NULL, \ 4336 }; \ 4337 static const struct attribute_group cm_counter_group_##_group = { \ 4338 .name = _name, \ 4339 .attrs = cm_counter_attrs_##_group, \ 4340 }; 4341 4342 CM_COUNTER_GROUP(CM_XMIT, "cm_tx_msgs") 4343 CM_COUNTER_GROUP(CM_XMIT_RETRIES, "cm_tx_retries") 4344 CM_COUNTER_GROUP(CM_RECV, "cm_rx_msgs") 4345 CM_COUNTER_GROUP(CM_RECV_DUPLICATES, "cm_rx_duplicates") 4346 4347 static const struct attribute_group *cm_counter_groups[] = { 4348 &cm_counter_group_CM_XMIT, 4349 &cm_counter_group_CM_XMIT_RETRIES, 4350 &cm_counter_group_CM_RECV, 4351 &cm_counter_group_CM_RECV_DUPLICATES, 4352 NULL, 4353 }; 4354 4355 static int cm_add_one(struct ib_device *ib_device) 4356 { 4357 struct cm_device *cm_dev; 4358 struct cm_port *port; 4359 struct ib_mad_reg_req reg_req = { 4360 .mgmt_class = IB_MGMT_CLASS_CM, 4361 .mgmt_class_version = IB_CM_CLASS_VERSION, 4362 }; 4363 struct ib_port_modify port_modify = { 4364 .set_port_cap_mask = IB_PORT_CM_SUP 4365 }; 4366 unsigned long flags; 4367 int ret; 4368 int count = 0; 4369 u32 i; 4370 4371 cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt), 4372 GFP_KERNEL); 4373 if (!cm_dev) 4374 return -ENOMEM; 4375 4376 kref_init(&cm_dev->kref); 4377 spin_lock_init(&cm_dev->mad_agent_lock); 4378 cm_dev->ib_device = ib_device; 4379 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay; 4380 cm_dev->going_down = 0; 4381 4382 ib_set_client_data(ib_device, &cm_client, cm_dev); 4383 4384 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 4385 rdma_for_each_port (ib_device, i) { 4386 if (!rdma_cap_ib_cm(ib_device, i)) 4387 continue; 4388 4389 port = kzalloc(sizeof *port, GFP_KERNEL); 4390 if (!port) { 4391 ret = -ENOMEM; 4392 goto error1; 4393 } 4394 4395 cm_dev->port[i-1] = port; 4396 port->cm_dev = cm_dev; 4397 port->port_num = i; 4398 4399 ret = ib_port_register_client_groups(ib_device, i, 4400 cm_counter_groups); 4401 if (ret) 4402 goto error1; 4403 4404 port->mad_agent = ib_register_mad_agent(ib_device, i, 4405 IB_QPT_GSI, 4406 ®_req, 4407 0, 4408 cm_send_handler, 4409 cm_recv_handler, 4410 port, 4411 0); 4412 if (IS_ERR(port->mad_agent)) { 4413 ret = PTR_ERR(port->mad_agent); 4414 goto error2; 4415 } 4416 4417 ret = ib_modify_port(ib_device, i, 0, &port_modify); 4418 if (ret) 4419 goto error3; 4420 4421 count++; 4422 } 4423 4424 if (!count) { 4425 ret = -EOPNOTSUPP; 4426 goto free; 4427 } 4428 4429 write_lock_irqsave(&cm.device_lock, flags); 4430 list_add_tail(&cm_dev->list, &cm.device_list); 4431 write_unlock_irqrestore(&cm.device_lock, flags); 4432 return 0; 4433 4434 error3: 4435 ib_unregister_mad_agent(port->mad_agent); 4436 error2: 4437 ib_port_unregister_client_groups(ib_device, i, cm_counter_groups); 4438 error1: 4439 port_modify.set_port_cap_mask = 0; 4440 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 4441 while (--i) { 4442 if (!rdma_cap_ib_cm(ib_device, i)) 4443 continue; 4444 4445 port = cm_dev->port[i-1]; 4446 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4447 ib_unregister_mad_agent(port->mad_agent); 4448 ib_port_unregister_client_groups(ib_device, i, 4449 cm_counter_groups); 4450 } 4451 free: 4452 cm_device_put(cm_dev); 4453 return ret; 4454 } 4455 4456 static void cm_remove_one(struct ib_device *ib_device, void *client_data) 4457 { 4458 struct cm_device *cm_dev = client_data; 4459 struct cm_port *port; 4460 struct ib_port_modify port_modify = { 4461 .clr_port_cap_mask = IB_PORT_CM_SUP 4462 }; 4463 unsigned long flags; 4464 u32 i; 4465 4466 write_lock_irqsave(&cm.device_lock, flags); 4467 list_del(&cm_dev->list); 4468 write_unlock_irqrestore(&cm.device_lock, flags); 4469 4470 spin_lock_irq(&cm.lock); 4471 cm_dev->going_down = 1; 4472 spin_unlock_irq(&cm.lock); 4473 4474 rdma_for_each_port (ib_device, i) { 4475 struct ib_mad_agent *mad_agent; 4476 4477 if (!rdma_cap_ib_cm(ib_device, i)) 4478 continue; 4479 4480 port = cm_dev->port[i-1]; 4481 mad_agent = port->mad_agent; 4482 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4483 /* 4484 * We flush the queue here after the going_down set, this 4485 * verify that no new works will be queued in the recv handler, 4486 * after that we can call the unregister_mad_agent 4487 */ 4488 flush_workqueue(cm.wq); 4489 /* 4490 * The above ensures no call paths from the work are running, 4491 * the remaining paths all take the mad_agent_lock. 4492 */ 4493 spin_lock(&cm_dev->mad_agent_lock); 4494 port->mad_agent = NULL; 4495 spin_unlock(&cm_dev->mad_agent_lock); 4496 ib_unregister_mad_agent(mad_agent); 4497 ib_port_unregister_client_groups(ib_device, i, 4498 cm_counter_groups); 4499 } 4500 4501 cm_device_put(cm_dev); 4502 } 4503 4504 static int __init ib_cm_init(void) 4505 { 4506 int ret; 4507 4508 INIT_LIST_HEAD(&cm.device_list); 4509 rwlock_init(&cm.device_lock); 4510 spin_lock_init(&cm.lock); 4511 cm.listen_service_table = RB_ROOT; 4512 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 4513 cm.remote_id_table = RB_ROOT; 4514 cm.remote_qp_table = RB_ROOT; 4515 cm.remote_sidr_table = RB_ROOT; 4516 xa_init_flags(&cm.local_id_table, XA_FLAGS_ALLOC); 4517 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 4518 INIT_LIST_HEAD(&cm.timewait_list); 4519 4520 cm.wq = alloc_workqueue("ib_cm", 0, 1); 4521 if (!cm.wq) { 4522 ret = -ENOMEM; 4523 goto error2; 4524 } 4525 4526 ret = ib_register_client(&cm_client); 4527 if (ret) 4528 goto error3; 4529 4530 return 0; 4531 error3: 4532 destroy_workqueue(cm.wq); 4533 error2: 4534 return ret; 4535 } 4536 4537 static void __exit ib_cm_cleanup(void) 4538 { 4539 struct cm_timewait_info *timewait_info, *tmp; 4540 4541 spin_lock_irq(&cm.lock); 4542 list_for_each_entry(timewait_info, &cm.timewait_list, list) 4543 cancel_delayed_work(&timewait_info->work.work); 4544 spin_unlock_irq(&cm.lock); 4545 4546 ib_unregister_client(&cm_client); 4547 destroy_workqueue(cm.wq); 4548 4549 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 4550 list_del(&timewait_info->list); 4551 kfree(timewait_info); 4552 } 4553 4554 WARN_ON(!xa_empty(&cm.local_id_table)); 4555 } 4556 4557 module_init(ib_cm_init); 4558 module_exit(ib_cm_cleanup); 4559