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 { 1031 struct cm_id_private *cm_id_priv; 1032 1033 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1034 pr_err("%s: cm_id=%p timed out. state=%d refcnt=%d\n", __func__, 1035 cm_id, cm_id->state, refcount_read(&cm_id_priv->refcount)); 1036 } 1037 1038 static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 1039 { 1040 struct cm_id_private *cm_id_priv; 1041 struct cm_work *work; 1042 int ret; 1043 1044 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1045 spin_lock_irq(&cm_id_priv->lock); 1046 retest: 1047 switch (cm_id->state) { 1048 case IB_CM_LISTEN: 1049 spin_lock(&cm.lock); 1050 if (--cm_id_priv->listen_sharecount > 0) { 1051 /* The id is still shared. */ 1052 WARN_ON(refcount_read(&cm_id_priv->refcount) == 1); 1053 spin_unlock(&cm.lock); 1054 spin_unlock_irq(&cm_id_priv->lock); 1055 cm_deref_id(cm_id_priv); 1056 return; 1057 } 1058 cm_id->state = IB_CM_IDLE; 1059 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 1060 RB_CLEAR_NODE(&cm_id_priv->service_node); 1061 spin_unlock(&cm.lock); 1062 break; 1063 case IB_CM_SIDR_REQ_SENT: 1064 cm_id->state = IB_CM_IDLE; 1065 ib_cancel_mad(cm_id_priv->msg); 1066 break; 1067 case IB_CM_SIDR_REQ_RCVD: 1068 cm_send_sidr_rep_locked(cm_id_priv, 1069 &(struct ib_cm_sidr_rep_param){ 1070 .status = IB_SIDR_REJECT }); 1071 /* cm_send_sidr_rep_locked will not move to IDLE if it fails */ 1072 cm_id->state = IB_CM_IDLE; 1073 break; 1074 case IB_CM_REQ_SENT: 1075 case IB_CM_MRA_REQ_RCVD: 1076 ib_cancel_mad(cm_id_priv->msg); 1077 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_TIMEOUT, 1078 &cm_id_priv->id.device->node_guid, 1079 sizeof(cm_id_priv->id.device->node_guid), 1080 NULL, 0); 1081 break; 1082 case IB_CM_REQ_RCVD: 1083 if (err == -ENOMEM) { 1084 /* Do not reject to allow future retries. */ 1085 cm_reset_to_idle(cm_id_priv); 1086 } else { 1087 cm_send_rej_locked(cm_id_priv, 1088 IB_CM_REJ_CONSUMER_DEFINED, NULL, 0, 1089 NULL, 0); 1090 } 1091 break; 1092 case IB_CM_REP_SENT: 1093 case IB_CM_MRA_REP_RCVD: 1094 ib_cancel_mad(cm_id_priv->msg); 1095 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL, 1096 0, NULL, 0); 1097 goto retest; 1098 case IB_CM_MRA_REQ_SENT: 1099 case IB_CM_REP_RCVD: 1100 case IB_CM_MRA_REP_SENT: 1101 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL, 1102 0, NULL, 0); 1103 break; 1104 case IB_CM_ESTABLISHED: 1105 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 1106 cm_id->state = IB_CM_IDLE; 1107 break; 1108 } 1109 cm_send_dreq_locked(cm_id_priv, NULL, 0); 1110 goto retest; 1111 case IB_CM_DREQ_SENT: 1112 ib_cancel_mad(cm_id_priv->msg); 1113 cm_enter_timewait(cm_id_priv); 1114 goto retest; 1115 case IB_CM_DREQ_RCVD: 1116 cm_send_drep_locked(cm_id_priv, NULL, 0); 1117 WARN_ON(cm_id->state != IB_CM_TIMEWAIT); 1118 goto retest; 1119 case IB_CM_TIMEWAIT: 1120 /* 1121 * The cm_acquire_id in cm_timewait_handler will stop working 1122 * once we do xa_erase below, so just move to idle here for 1123 * consistency. 1124 */ 1125 cm_id->state = IB_CM_IDLE; 1126 break; 1127 case IB_CM_IDLE: 1128 break; 1129 } 1130 WARN_ON(cm_id->state != IB_CM_IDLE); 1131 1132 spin_lock(&cm.lock); 1133 /* Required for cleanup paths related cm_req_handler() */ 1134 if (cm_id_priv->timewait_info) { 1135 cm_remove_remote(cm_id_priv); 1136 kfree(cm_id_priv->timewait_info); 1137 cm_id_priv->timewait_info = NULL; 1138 } 1139 1140 WARN_ON(cm_id_priv->listen_sharecount); 1141 WARN_ON(!RB_EMPTY_NODE(&cm_id_priv->service_node)); 1142 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) 1143 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 1144 spin_unlock(&cm.lock); 1145 spin_unlock_irq(&cm_id_priv->lock); 1146 1147 xa_erase(&cm.local_id_table, cm_local_id(cm_id->local_id)); 1148 cm_deref_id(cm_id_priv); 1149 do { 1150 ret = wait_for_completion_timeout(&cm_id_priv->comp, 1151 msecs_to_jiffies( 1152 CM_DESTROY_ID_WAIT_TIMEOUT)); 1153 if (!ret) /* timeout happened */ 1154 cm_destroy_id_wait_timeout(cm_id); 1155 } while (!ret); 1156 1157 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 1158 cm_free_work(work); 1159 1160 cm_destroy_av(&cm_id_priv->av); 1161 cm_destroy_av(&cm_id_priv->alt_av); 1162 kfree(cm_id_priv->private_data); 1163 kfree_rcu(cm_id_priv, rcu); 1164 } 1165 1166 void ib_destroy_cm_id(struct ib_cm_id *cm_id) 1167 { 1168 cm_destroy_id(cm_id, 0); 1169 } 1170 EXPORT_SYMBOL(ib_destroy_cm_id); 1171 1172 static int cm_init_listen(struct cm_id_private *cm_id_priv, __be64 service_id) 1173 { 1174 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 1175 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 1176 return -EINVAL; 1177 1178 if (service_id == IB_CM_ASSIGN_SERVICE_ID) 1179 cm_id_priv->id.service_id = cpu_to_be64(cm.listen_service_id++); 1180 else 1181 cm_id_priv->id.service_id = service_id; 1182 1183 return 0; 1184 } 1185 1186 /** 1187 * ib_cm_listen - Initiates listening on the specified service ID for 1188 * connection and service ID resolution requests. 1189 * @cm_id: Connection identifier associated with the listen request. 1190 * @service_id: Service identifier matched against incoming connection 1191 * and service ID resolution requests. The service ID should be specified 1192 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1193 * assign a service ID to the caller. 1194 */ 1195 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id) 1196 { 1197 struct cm_id_private *cm_id_priv = 1198 container_of(cm_id, struct cm_id_private, id); 1199 unsigned long flags; 1200 int ret; 1201 1202 spin_lock_irqsave(&cm_id_priv->lock, flags); 1203 if (cm_id_priv->id.state != IB_CM_IDLE) { 1204 ret = -EINVAL; 1205 goto out; 1206 } 1207 1208 ret = cm_init_listen(cm_id_priv, service_id); 1209 if (ret) 1210 goto out; 1211 1212 if (!cm_insert_listen(cm_id_priv, NULL)) { 1213 ret = -EBUSY; 1214 goto out; 1215 } 1216 1217 cm_id_priv->id.state = IB_CM_LISTEN; 1218 ret = 0; 1219 1220 out: 1221 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1222 return ret; 1223 } 1224 EXPORT_SYMBOL(ib_cm_listen); 1225 1226 /** 1227 * ib_cm_insert_listen - Create a new listening ib_cm_id and listen on 1228 * the given service ID. 1229 * 1230 * If there's an existing ID listening on that same device and service ID, 1231 * return it. 1232 * 1233 * @device: Device associated with the cm_id. All related communication will 1234 * be associated with the specified device. 1235 * @cm_handler: Callback invoked to notify the user of CM events. 1236 * @service_id: Service identifier matched against incoming connection 1237 * and service ID resolution requests. The service ID should be specified 1238 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1239 * assign a service ID to the caller. 1240 * 1241 * Callers should call ib_destroy_cm_id when done with the listener ID. 1242 */ 1243 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device, 1244 ib_cm_handler cm_handler, 1245 __be64 service_id) 1246 { 1247 struct cm_id_private *listen_id_priv; 1248 struct cm_id_private *cm_id_priv; 1249 int err = 0; 1250 1251 /* Create an ID in advance, since the creation may sleep */ 1252 cm_id_priv = cm_alloc_id_priv(device, cm_handler, NULL); 1253 if (IS_ERR(cm_id_priv)) 1254 return ERR_CAST(cm_id_priv); 1255 1256 err = cm_init_listen(cm_id_priv, service_id); 1257 if (err) { 1258 ib_destroy_cm_id(&cm_id_priv->id); 1259 return ERR_PTR(err); 1260 } 1261 1262 spin_lock_irq(&cm_id_priv->lock); 1263 listen_id_priv = cm_insert_listen(cm_id_priv, cm_handler); 1264 if (listen_id_priv != cm_id_priv) { 1265 spin_unlock_irq(&cm_id_priv->lock); 1266 ib_destroy_cm_id(&cm_id_priv->id); 1267 if (!listen_id_priv) 1268 return ERR_PTR(-EINVAL); 1269 return &listen_id_priv->id; 1270 } 1271 cm_id_priv->id.state = IB_CM_LISTEN; 1272 spin_unlock_irq(&cm_id_priv->lock); 1273 1274 /* 1275 * A listen ID does not need to be in the xarray since it does not 1276 * receive mads, is not placed in the remote_id or remote_qpn rbtree, 1277 * and does not enter timewait. 1278 */ 1279 1280 return &cm_id_priv->id; 1281 } 1282 EXPORT_SYMBOL(ib_cm_insert_listen); 1283 1284 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv) 1285 { 1286 u64 hi_tid = 0, low_tid; 1287 1288 lockdep_assert_held(&cm_id_priv->lock); 1289 1290 low_tid = (u64)cm_id_priv->id.local_id; 1291 if (!cm_id_priv->av.port) 1292 return cpu_to_be64(low_tid); 1293 1294 spin_lock(&cm_id_priv->av.port->cm_dev->mad_agent_lock); 1295 if (cm_id_priv->av.port->mad_agent) 1296 hi_tid = ((u64)cm_id_priv->av.port->mad_agent->hi_tid) << 32; 1297 spin_unlock(&cm_id_priv->av.port->cm_dev->mad_agent_lock); 1298 return cpu_to_be64(hi_tid | low_tid); 1299 } 1300 1301 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 1302 __be16 attr_id, __be64 tid) 1303 { 1304 hdr->base_version = IB_MGMT_BASE_VERSION; 1305 hdr->mgmt_class = IB_MGMT_CLASS_CM; 1306 hdr->class_version = IB_CM_CLASS_VERSION; 1307 hdr->method = IB_MGMT_METHOD_SEND; 1308 hdr->attr_id = attr_id; 1309 hdr->tid = tid; 1310 } 1311 1312 static void cm_format_mad_ece_hdr(struct ib_mad_hdr *hdr, __be16 attr_id, 1313 __be64 tid, u32 attr_mod) 1314 { 1315 cm_format_mad_hdr(hdr, attr_id, tid); 1316 hdr->attr_mod = cpu_to_be32(attr_mod); 1317 } 1318 1319 static void cm_format_req(struct cm_req_msg *req_msg, 1320 struct cm_id_private *cm_id_priv, 1321 struct ib_cm_req_param *param) 1322 { 1323 struct sa_path_rec *pri_path = param->primary_path; 1324 struct sa_path_rec *alt_path = param->alternate_path; 1325 bool pri_ext = false; 1326 __be16 lid; 1327 1328 if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA) 1329 pri_ext = opa_is_extended_lid(pri_path->opa.dlid, 1330 pri_path->opa.slid); 1331 1332 cm_format_mad_ece_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1333 cm_form_tid(cm_id_priv), param->ece.attr_mod); 1334 1335 IBA_SET(CM_REQ_LOCAL_COMM_ID, req_msg, 1336 be32_to_cpu(cm_id_priv->id.local_id)); 1337 IBA_SET(CM_REQ_SERVICE_ID, req_msg, be64_to_cpu(param->service_id)); 1338 IBA_SET(CM_REQ_LOCAL_CA_GUID, req_msg, 1339 be64_to_cpu(cm_id_priv->id.device->node_guid)); 1340 IBA_SET(CM_REQ_LOCAL_QPN, req_msg, param->qp_num); 1341 IBA_SET(CM_REQ_INITIATOR_DEPTH, req_msg, param->initiator_depth); 1342 IBA_SET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg, 1343 param->remote_cm_response_timeout); 1344 cm_req_set_qp_type(req_msg, param->qp_type); 1345 IBA_SET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg, param->flow_control); 1346 IBA_SET(CM_REQ_STARTING_PSN, req_msg, param->starting_psn); 1347 IBA_SET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg, 1348 param->local_cm_response_timeout); 1349 IBA_SET(CM_REQ_PARTITION_KEY, req_msg, 1350 be16_to_cpu(param->primary_path->pkey)); 1351 IBA_SET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg, 1352 param->primary_path->mtu); 1353 IBA_SET(CM_REQ_MAX_CM_RETRIES, req_msg, param->max_cm_retries); 1354 1355 if (param->qp_type != IB_QPT_XRC_INI) { 1356 IBA_SET(CM_REQ_RESPONDER_RESOURCES, req_msg, 1357 param->responder_resources); 1358 IBA_SET(CM_REQ_RETRY_COUNT, req_msg, param->retry_count); 1359 IBA_SET(CM_REQ_RNR_RETRY_COUNT, req_msg, 1360 param->rnr_retry_count); 1361 IBA_SET(CM_REQ_SRQ, req_msg, param->srq); 1362 } 1363 1364 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) = 1365 pri_path->sgid; 1366 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) = 1367 pri_path->dgid; 1368 if (pri_ext) { 1369 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) 1370 ->global.interface_id = 1371 OPA_MAKE_ID(be32_to_cpu(pri_path->opa.slid)); 1372 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) 1373 ->global.interface_id = 1374 OPA_MAKE_ID(be32_to_cpu(pri_path->opa.dlid)); 1375 } 1376 if (pri_path->hop_limit <= 1) { 1377 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 1378 be16_to_cpu(pri_ext ? 0 : 1379 htons(ntohl(sa_path_get_slid( 1380 pri_path))))); 1381 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, 1382 be16_to_cpu(pri_ext ? 0 : 1383 htons(ntohl(sa_path_get_dlid( 1384 pri_path))))); 1385 } else { 1386 1387 if (param->primary_path_inbound) { 1388 lid = param->primary_path_inbound->ib.dlid; 1389 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 1390 be16_to_cpu(lid)); 1391 } else 1392 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 1393 be16_to_cpu(IB_LID_PERMISSIVE)); 1394 1395 /* Work-around until there's a way to obtain remote LID info */ 1396 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, 1397 be16_to_cpu(IB_LID_PERMISSIVE)); 1398 } 1399 IBA_SET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg, 1400 be32_to_cpu(pri_path->flow_label)); 1401 IBA_SET(CM_REQ_PRIMARY_PACKET_RATE, req_msg, pri_path->rate); 1402 IBA_SET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg, pri_path->traffic_class); 1403 IBA_SET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg, pri_path->hop_limit); 1404 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, pri_path->sl); 1405 IBA_SET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg, 1406 (pri_path->hop_limit <= 1)); 1407 IBA_SET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg, 1408 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1409 pri_path->packet_life_time)); 1410 1411 if (alt_path) { 1412 bool alt_ext = false; 1413 1414 if (alt_path->rec_type == SA_PATH_REC_TYPE_OPA) 1415 alt_ext = opa_is_extended_lid(alt_path->opa.dlid, 1416 alt_path->opa.slid); 1417 1418 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg) = 1419 alt_path->sgid; 1420 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg) = 1421 alt_path->dgid; 1422 if (alt_ext) { 1423 IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, 1424 req_msg) 1425 ->global.interface_id = 1426 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.slid)); 1427 IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, 1428 req_msg) 1429 ->global.interface_id = 1430 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.dlid)); 1431 } 1432 if (alt_path->hop_limit <= 1) { 1433 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, 1434 be16_to_cpu( 1435 alt_ext ? 0 : 1436 htons(ntohl(sa_path_get_slid( 1437 alt_path))))); 1438 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, 1439 be16_to_cpu( 1440 alt_ext ? 0 : 1441 htons(ntohl(sa_path_get_dlid( 1442 alt_path))))); 1443 } else { 1444 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, 1445 be16_to_cpu(IB_LID_PERMISSIVE)); 1446 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, 1447 be16_to_cpu(IB_LID_PERMISSIVE)); 1448 } 1449 IBA_SET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg, 1450 be32_to_cpu(alt_path->flow_label)); 1451 IBA_SET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg, alt_path->rate); 1452 IBA_SET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg, 1453 alt_path->traffic_class); 1454 IBA_SET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg, 1455 alt_path->hop_limit); 1456 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, alt_path->sl); 1457 IBA_SET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg, 1458 (alt_path->hop_limit <= 1)); 1459 IBA_SET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg, 1460 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1461 alt_path->packet_life_time)); 1462 } 1463 IBA_SET(CM_REQ_VENDOR_ID, req_msg, param->ece.vendor_id); 1464 1465 if (param->private_data && param->private_data_len) 1466 IBA_SET_MEM(CM_REQ_PRIVATE_DATA, req_msg, param->private_data, 1467 param->private_data_len); 1468 } 1469 1470 static int cm_validate_req_param(struct ib_cm_req_param *param) 1471 { 1472 if (!param->primary_path) 1473 return -EINVAL; 1474 1475 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC && 1476 param->qp_type != IB_QPT_XRC_INI) 1477 return -EINVAL; 1478 1479 if (param->private_data && 1480 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1481 return -EINVAL; 1482 1483 if (param->alternate_path && 1484 (param->alternate_path->pkey != param->primary_path->pkey || 1485 param->alternate_path->mtu != param->primary_path->mtu)) 1486 return -EINVAL; 1487 1488 return 0; 1489 } 1490 1491 int ib_send_cm_req(struct ib_cm_id *cm_id, 1492 struct ib_cm_req_param *param) 1493 { 1494 struct cm_av av = {}, alt_av = {}; 1495 struct cm_id_private *cm_id_priv; 1496 struct ib_mad_send_buf *msg; 1497 struct cm_req_msg *req_msg; 1498 unsigned long flags; 1499 int ret; 1500 1501 ret = cm_validate_req_param(param); 1502 if (ret) 1503 return ret; 1504 1505 /* Verify that we're not in timewait. */ 1506 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1507 spin_lock_irqsave(&cm_id_priv->lock, flags); 1508 if (cm_id->state != IB_CM_IDLE || WARN_ON(cm_id_priv->timewait_info)) { 1509 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1510 return -EINVAL; 1511 } 1512 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1513 1514 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1515 id.local_id); 1516 if (IS_ERR(cm_id_priv->timewait_info)) { 1517 ret = PTR_ERR(cm_id_priv->timewait_info); 1518 cm_id_priv->timewait_info = NULL; 1519 return ret; 1520 } 1521 1522 ret = cm_init_av_by_path(param->primary_path, 1523 param->ppath_sgid_attr, &av); 1524 if (ret) 1525 return ret; 1526 if (param->alternate_path) { 1527 ret = cm_init_av_by_path(param->alternate_path, NULL, 1528 &alt_av); 1529 if (ret) { 1530 cm_destroy_av(&av); 1531 return ret; 1532 } 1533 } 1534 cm_id->service_id = param->service_id; 1535 cm_id_priv->timeout_ms = cm_convert_to_ms( 1536 param->primary_path->packet_life_time) * 2 + 1537 cm_convert_to_ms( 1538 param->remote_cm_response_timeout); 1539 cm_id_priv->max_cm_retries = param->max_cm_retries; 1540 cm_id_priv->initiator_depth = param->initiator_depth; 1541 cm_id_priv->responder_resources = param->responder_resources; 1542 cm_id_priv->retry_count = param->retry_count; 1543 cm_id_priv->path_mtu = param->primary_path->mtu; 1544 cm_id_priv->pkey = param->primary_path->pkey; 1545 cm_id_priv->qp_type = param->qp_type; 1546 1547 spin_lock_irqsave(&cm_id_priv->lock, flags); 1548 1549 cm_move_av_from_path(&cm_id_priv->av, &av); 1550 if (param->primary_path_outbound) 1551 cm_id_priv->av.dlid_datapath = 1552 be16_to_cpu(param->primary_path_outbound->ib.dlid); 1553 1554 if (param->alternate_path) 1555 cm_move_av_from_path(&cm_id_priv->alt_av, &alt_av); 1556 1557 msg = cm_alloc_priv_msg(cm_id_priv); 1558 if (IS_ERR(msg)) { 1559 ret = PTR_ERR(msg); 1560 goto out_unlock; 1561 } 1562 1563 req_msg = (struct cm_req_msg *)msg->mad; 1564 cm_format_req(req_msg, cm_id_priv, param); 1565 cm_id_priv->tid = req_msg->hdr.tid; 1566 msg->timeout_ms = cm_id_priv->timeout_ms; 1567 msg->context[1] = (void *)(unsigned long)IB_CM_REQ_SENT; 1568 1569 cm_id_priv->local_qpn = cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg)); 1570 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg)); 1571 1572 trace_icm_send_req(&cm_id_priv->id); 1573 ret = ib_post_send_mad(msg, NULL); 1574 if (ret) 1575 goto out_free; 1576 BUG_ON(cm_id->state != IB_CM_IDLE); 1577 cm_id->state = IB_CM_REQ_SENT; 1578 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1579 return 0; 1580 out_free: 1581 cm_free_priv_msg(msg); 1582 out_unlock: 1583 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1584 return ret; 1585 } 1586 EXPORT_SYMBOL(ib_send_cm_req); 1587 1588 static int cm_issue_rej(struct cm_port *port, 1589 struct ib_mad_recv_wc *mad_recv_wc, 1590 enum ib_cm_rej_reason reason, 1591 enum cm_msg_response msg_rejected, 1592 void *ari, u8 ari_length) 1593 { 1594 struct ib_mad_send_buf *msg = NULL; 1595 struct cm_rej_msg *rej_msg, *rcv_msg; 1596 int ret; 1597 1598 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1599 if (ret) 1600 return ret; 1601 1602 /* We just need common CM header information. Cast to any message. */ 1603 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1604 rej_msg = (struct cm_rej_msg *) msg->mad; 1605 1606 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1607 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg, 1608 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg)); 1609 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1610 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg)); 1611 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, msg_rejected); 1612 IBA_SET(CM_REJ_REASON, rej_msg, reason); 1613 1614 if (ari && ari_length) { 1615 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length); 1616 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length); 1617 } 1618 1619 trace_icm_issue_rej( 1620 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg), 1621 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg)); 1622 ret = ib_post_send_mad(msg, NULL); 1623 if (ret) 1624 cm_free_response_msg(msg); 1625 1626 return ret; 1627 } 1628 1629 static bool cm_req_has_alt_path(struct cm_req_msg *req_msg) 1630 { 1631 return ((cpu_to_be16( 1632 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg))) || 1633 (ib_is_opa_gid(IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, 1634 req_msg)))); 1635 } 1636 1637 static void cm_path_set_rec_type(struct ib_device *ib_device, u32 port_num, 1638 struct sa_path_rec *path, union ib_gid *gid) 1639 { 1640 if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num)) 1641 path->rec_type = SA_PATH_REC_TYPE_OPA; 1642 else 1643 path->rec_type = SA_PATH_REC_TYPE_IB; 1644 } 1645 1646 static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg, 1647 struct sa_path_rec *primary_path, 1648 struct sa_path_rec *alt_path, 1649 struct ib_wc *wc) 1650 { 1651 u32 lid; 1652 1653 if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) { 1654 sa_path_set_dlid(primary_path, wc->slid); 1655 sa_path_set_slid(primary_path, 1656 IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID, 1657 req_msg)); 1658 } else { 1659 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1660 CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg)); 1661 sa_path_set_dlid(primary_path, lid); 1662 1663 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1664 CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg)); 1665 sa_path_set_slid(primary_path, lid); 1666 } 1667 1668 if (!cm_req_has_alt_path(req_msg)) 1669 return; 1670 1671 if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) { 1672 sa_path_set_dlid(alt_path, 1673 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, 1674 req_msg)); 1675 sa_path_set_slid(alt_path, 1676 IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, 1677 req_msg)); 1678 } else { 1679 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1680 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg)); 1681 sa_path_set_dlid(alt_path, lid); 1682 1683 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1684 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg)); 1685 sa_path_set_slid(alt_path, lid); 1686 } 1687 } 1688 1689 static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1690 struct sa_path_rec *primary_path, 1691 struct sa_path_rec *alt_path, 1692 struct ib_wc *wc) 1693 { 1694 primary_path->dgid = 1695 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg); 1696 primary_path->sgid = 1697 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg); 1698 primary_path->flow_label = 1699 cpu_to_be32(IBA_GET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg)); 1700 primary_path->hop_limit = IBA_GET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg); 1701 primary_path->traffic_class = 1702 IBA_GET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg); 1703 primary_path->reversible = 1; 1704 primary_path->pkey = 1705 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 1706 primary_path->sl = IBA_GET(CM_REQ_PRIMARY_SL, req_msg); 1707 primary_path->mtu_selector = IB_SA_EQ; 1708 primary_path->mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 1709 primary_path->rate_selector = IB_SA_EQ; 1710 primary_path->rate = IBA_GET(CM_REQ_PRIMARY_PACKET_RATE, req_msg); 1711 primary_path->packet_life_time_selector = IB_SA_EQ; 1712 primary_path->packet_life_time = 1713 IBA_GET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg); 1714 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1715 primary_path->service_id = 1716 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 1717 if (sa_path_is_roce(primary_path)) 1718 primary_path->roce.route_resolved = false; 1719 1720 if (cm_req_has_alt_path(req_msg)) { 1721 alt_path->dgid = *IBA_GET_MEM_PTR( 1722 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg); 1723 alt_path->sgid = *IBA_GET_MEM_PTR( 1724 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg); 1725 alt_path->flow_label = cpu_to_be32( 1726 IBA_GET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg)); 1727 alt_path->hop_limit = 1728 IBA_GET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg); 1729 alt_path->traffic_class = 1730 IBA_GET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg); 1731 alt_path->reversible = 1; 1732 alt_path->pkey = 1733 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 1734 alt_path->sl = IBA_GET(CM_REQ_ALTERNATE_SL, req_msg); 1735 alt_path->mtu_selector = IB_SA_EQ; 1736 alt_path->mtu = 1737 IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 1738 alt_path->rate_selector = IB_SA_EQ; 1739 alt_path->rate = IBA_GET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg); 1740 alt_path->packet_life_time_selector = IB_SA_EQ; 1741 alt_path->packet_life_time = 1742 IBA_GET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg); 1743 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1744 alt_path->service_id = 1745 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 1746 1747 if (sa_path_is_roce(alt_path)) 1748 alt_path->roce.route_resolved = false; 1749 } 1750 cm_format_path_lid_from_req(req_msg, primary_path, alt_path, wc); 1751 } 1752 1753 static u16 cm_get_bth_pkey(struct cm_work *work) 1754 { 1755 struct ib_device *ib_dev = work->port->cm_dev->ib_device; 1756 u32 port_num = work->port->port_num; 1757 u16 pkey_index = work->mad_recv_wc->wc->pkey_index; 1758 u16 pkey; 1759 int ret; 1760 1761 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey); 1762 if (ret) { 1763 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %u, pkey index %u). %d\n", 1764 port_num, pkey_index, ret); 1765 return 0; 1766 } 1767 1768 return pkey; 1769 } 1770 1771 /** 1772 * cm_opa_to_ib_sgid - Convert OPA SGID to IB SGID 1773 * ULPs (such as IPoIB) do not understand OPA GIDs and will 1774 * reject them as the local_gid will not match the sgid. Therefore, 1775 * change the pathrec's SGID to an IB SGID. 1776 * 1777 * @work: Work completion 1778 * @path: Path record 1779 */ 1780 static void cm_opa_to_ib_sgid(struct cm_work *work, 1781 struct sa_path_rec *path) 1782 { 1783 struct ib_device *dev = work->port->cm_dev->ib_device; 1784 u32 port_num = work->port->port_num; 1785 1786 if (rdma_cap_opa_ah(dev, port_num) && 1787 (ib_is_opa_gid(&path->sgid))) { 1788 union ib_gid sgid; 1789 1790 if (rdma_query_gid(dev, port_num, 0, &sgid)) { 1791 dev_warn(&dev->dev, 1792 "Error updating sgid in CM request\n"); 1793 return; 1794 } 1795 1796 path->sgid = sgid; 1797 } 1798 } 1799 1800 static void cm_format_req_event(struct cm_work *work, 1801 struct cm_id_private *cm_id_priv, 1802 struct ib_cm_id *listen_id) 1803 { 1804 struct cm_req_msg *req_msg; 1805 struct ib_cm_req_event_param *param; 1806 1807 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1808 param = &work->cm_event.param.req_rcvd; 1809 param->listen_id = listen_id; 1810 param->bth_pkey = cm_get_bth_pkey(work); 1811 param->port = cm_id_priv->av.port->port_num; 1812 param->primary_path = &work->path[0]; 1813 cm_opa_to_ib_sgid(work, param->primary_path); 1814 if (cm_req_has_alt_path(req_msg)) { 1815 param->alternate_path = &work->path[1]; 1816 cm_opa_to_ib_sgid(work, param->alternate_path); 1817 } else { 1818 param->alternate_path = NULL; 1819 } 1820 param->remote_ca_guid = 1821 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg)); 1822 param->remote_qkey = IBA_GET(CM_REQ_LOCAL_Q_KEY, req_msg); 1823 param->remote_qpn = IBA_GET(CM_REQ_LOCAL_QPN, req_msg); 1824 param->qp_type = cm_req_get_qp_type(req_msg); 1825 param->starting_psn = IBA_GET(CM_REQ_STARTING_PSN, req_msg); 1826 param->responder_resources = IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg); 1827 param->initiator_depth = IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg); 1828 param->local_cm_response_timeout = 1829 IBA_GET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg); 1830 param->flow_control = IBA_GET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg); 1831 param->remote_cm_response_timeout = 1832 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg); 1833 param->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg); 1834 param->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg); 1835 param->srq = IBA_GET(CM_REQ_SRQ, req_msg); 1836 param->ppath_sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr; 1837 param->ece.vendor_id = IBA_GET(CM_REQ_VENDOR_ID, req_msg); 1838 param->ece.attr_mod = be32_to_cpu(req_msg->hdr.attr_mod); 1839 1840 work->cm_event.private_data = 1841 IBA_GET_MEM_PTR(CM_REQ_PRIVATE_DATA, req_msg); 1842 } 1843 1844 static void cm_process_work(struct cm_id_private *cm_id_priv, 1845 struct cm_work *work) 1846 { 1847 int ret; 1848 1849 /* We will typically only have the current event to report. */ 1850 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1851 cm_free_work(work); 1852 1853 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1854 spin_lock_irq(&cm_id_priv->lock); 1855 work = cm_dequeue_work(cm_id_priv); 1856 spin_unlock_irq(&cm_id_priv->lock); 1857 if (!work) 1858 return; 1859 1860 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1861 &work->cm_event); 1862 cm_free_work(work); 1863 } 1864 cm_deref_id(cm_id_priv); 1865 if (ret) 1866 cm_destroy_id(&cm_id_priv->id, ret); 1867 } 1868 1869 static void cm_format_mra(struct cm_mra_msg *mra_msg, 1870 struct cm_id_private *cm_id_priv, 1871 enum cm_msg_response msg_mraed, u8 service_timeout, 1872 const void *private_data, u8 private_data_len) 1873 { 1874 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1875 IBA_SET(CM_MRA_MESSAGE_MRAED, mra_msg, msg_mraed); 1876 IBA_SET(CM_MRA_LOCAL_COMM_ID, mra_msg, 1877 be32_to_cpu(cm_id_priv->id.local_id)); 1878 IBA_SET(CM_MRA_REMOTE_COMM_ID, mra_msg, 1879 be32_to_cpu(cm_id_priv->id.remote_id)); 1880 IBA_SET(CM_MRA_SERVICE_TIMEOUT, mra_msg, service_timeout); 1881 1882 if (private_data && private_data_len) 1883 IBA_SET_MEM(CM_MRA_PRIVATE_DATA, mra_msg, private_data, 1884 private_data_len); 1885 } 1886 1887 static void cm_format_rej(struct cm_rej_msg *rej_msg, 1888 struct cm_id_private *cm_id_priv, 1889 enum ib_cm_rej_reason reason, void *ari, 1890 u8 ari_length, const void *private_data, 1891 u8 private_data_len, enum ib_cm_state state) 1892 { 1893 lockdep_assert_held(&cm_id_priv->lock); 1894 1895 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1896 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg, 1897 be32_to_cpu(cm_id_priv->id.remote_id)); 1898 1899 switch (state) { 1900 case IB_CM_REQ_RCVD: 1901 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, be32_to_cpu(0)); 1902 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ); 1903 break; 1904 case IB_CM_MRA_REQ_SENT: 1905 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1906 be32_to_cpu(cm_id_priv->id.local_id)); 1907 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ); 1908 break; 1909 case IB_CM_REP_RCVD: 1910 case IB_CM_MRA_REP_SENT: 1911 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1912 be32_to_cpu(cm_id_priv->id.local_id)); 1913 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REP); 1914 break; 1915 default: 1916 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1917 be32_to_cpu(cm_id_priv->id.local_id)); 1918 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, 1919 CM_MSG_RESPONSE_OTHER); 1920 break; 1921 } 1922 1923 IBA_SET(CM_REJ_REASON, rej_msg, reason); 1924 if (ari && ari_length) { 1925 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length); 1926 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length); 1927 } 1928 1929 if (private_data && private_data_len) 1930 IBA_SET_MEM(CM_REJ_PRIVATE_DATA, rej_msg, private_data, 1931 private_data_len); 1932 } 1933 1934 static void cm_dup_req_handler(struct cm_work *work, 1935 struct cm_id_private *cm_id_priv) 1936 { 1937 struct ib_mad_send_buf *msg = NULL; 1938 int ret; 1939 1940 atomic_long_inc( 1941 &work->port->counters[CM_RECV_DUPLICATES][CM_REQ_COUNTER]); 1942 1943 /* Quick state check to discard duplicate REQs. */ 1944 spin_lock_irq(&cm_id_priv->lock); 1945 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) { 1946 spin_unlock_irq(&cm_id_priv->lock); 1947 return; 1948 } 1949 spin_unlock_irq(&cm_id_priv->lock); 1950 1951 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1952 if (ret) 1953 return; 1954 1955 spin_lock_irq(&cm_id_priv->lock); 1956 switch (cm_id_priv->id.state) { 1957 case IB_CM_MRA_REQ_SENT: 1958 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1959 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1960 cm_id_priv->private_data, 1961 cm_id_priv->private_data_len); 1962 break; 1963 case IB_CM_TIMEWAIT: 1964 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, 1965 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0, 1966 IB_CM_TIMEWAIT); 1967 break; 1968 default: 1969 goto unlock; 1970 } 1971 spin_unlock_irq(&cm_id_priv->lock); 1972 1973 trace_icm_send_dup_req(&cm_id_priv->id); 1974 ret = ib_post_send_mad(msg, NULL); 1975 if (ret) 1976 goto free; 1977 return; 1978 1979 unlock: spin_unlock_irq(&cm_id_priv->lock); 1980 free: cm_free_response_msg(msg); 1981 } 1982 1983 static struct cm_id_private *cm_match_req(struct cm_work *work, 1984 struct cm_id_private *cm_id_priv) 1985 { 1986 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1987 struct cm_timewait_info *timewait_info; 1988 struct cm_req_msg *req_msg; 1989 1990 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1991 1992 /* Check for possible duplicate REQ. */ 1993 spin_lock_irq(&cm.lock); 1994 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1995 if (timewait_info) { 1996 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 1997 timewait_info->work.remote_id); 1998 spin_unlock_irq(&cm.lock); 1999 if (cur_cm_id_priv) { 2000 cm_dup_req_handler(work, cur_cm_id_priv); 2001 cm_deref_id(cur_cm_id_priv); 2002 } 2003 return NULL; 2004 } 2005 2006 /* Check for stale connections. */ 2007 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 2008 if (timewait_info) { 2009 cm_remove_remote(cm_id_priv); 2010 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2011 timewait_info->work.remote_id); 2012 2013 spin_unlock_irq(&cm.lock); 2014 cm_issue_rej(work->port, work->mad_recv_wc, 2015 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 2016 NULL, 0); 2017 if (cur_cm_id_priv) { 2018 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0); 2019 cm_deref_id(cur_cm_id_priv); 2020 } 2021 return NULL; 2022 } 2023 2024 /* Find matching listen request. */ 2025 listen_cm_id_priv = cm_find_listen( 2026 cm_id_priv->id.device, 2027 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg))); 2028 if (!listen_cm_id_priv) { 2029 cm_remove_remote(cm_id_priv); 2030 spin_unlock_irq(&cm.lock); 2031 cm_issue_rej(work->port, work->mad_recv_wc, 2032 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 2033 NULL, 0); 2034 return NULL; 2035 } 2036 spin_unlock_irq(&cm.lock); 2037 return listen_cm_id_priv; 2038 } 2039 2040 /* 2041 * Work-around for inter-subnet connections. If the LIDs are permissive, 2042 * we need to override the LID/SL data in the REQ with the LID information 2043 * in the work completion. 2044 */ 2045 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 2046 { 2047 if (!IBA_GET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg)) { 2048 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID, 2049 req_msg)) == IB_LID_PERMISSIVE) { 2050 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 2051 be16_to_cpu(ib_lid_be16(wc->slid))); 2052 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, wc->sl); 2053 } 2054 2055 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID, 2056 req_msg)) == IB_LID_PERMISSIVE) 2057 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, 2058 wc->dlid_path_bits); 2059 } 2060 2061 if (!IBA_GET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg)) { 2062 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, 2063 req_msg)) == IB_LID_PERMISSIVE) { 2064 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, 2065 be16_to_cpu(ib_lid_be16(wc->slid))); 2066 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, wc->sl); 2067 } 2068 2069 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, 2070 req_msg)) == IB_LID_PERMISSIVE) 2071 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, 2072 wc->dlid_path_bits); 2073 } 2074 } 2075 2076 static int cm_req_handler(struct cm_work *work) 2077 { 2078 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 2079 struct cm_req_msg *req_msg; 2080 const struct ib_global_route *grh; 2081 const struct ib_gid_attr *gid_attr; 2082 int ret; 2083 2084 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 2085 2086 cm_id_priv = 2087 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL); 2088 if (IS_ERR(cm_id_priv)) 2089 return PTR_ERR(cm_id_priv); 2090 2091 cm_id_priv->id.remote_id = 2092 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_COMM_ID, req_msg)); 2093 cm_id_priv->id.service_id = 2094 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 2095 cm_id_priv->tid = req_msg->hdr.tid; 2096 cm_id_priv->timeout_ms = cm_convert_to_ms( 2097 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg)); 2098 cm_id_priv->max_cm_retries = IBA_GET(CM_REQ_MAX_CM_RETRIES, req_msg); 2099 cm_id_priv->remote_qpn = 2100 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg)); 2101 cm_id_priv->initiator_depth = 2102 IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg); 2103 cm_id_priv->responder_resources = 2104 IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg); 2105 cm_id_priv->path_mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 2106 cm_id_priv->pkey = cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 2107 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg)); 2108 cm_id_priv->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg); 2109 cm_id_priv->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg); 2110 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 2111 2112 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2113 work->mad_recv_wc->recv_buf.grh, 2114 &cm_id_priv->av); 2115 if (ret) 2116 goto destroy; 2117 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 2118 id.local_id); 2119 if (IS_ERR(cm_id_priv->timewait_info)) { 2120 ret = PTR_ERR(cm_id_priv->timewait_info); 2121 cm_id_priv->timewait_info = NULL; 2122 goto destroy; 2123 } 2124 cm_id_priv->timewait_info->work.remote_id = cm_id_priv->id.remote_id; 2125 cm_id_priv->timewait_info->remote_ca_guid = 2126 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg)); 2127 cm_id_priv->timewait_info->remote_qpn = cm_id_priv->remote_qpn; 2128 2129 /* 2130 * Note that the ID pointer is not in the xarray at this point, 2131 * so this set is only visible to the local thread. 2132 */ 2133 cm_id_priv->id.state = IB_CM_REQ_RCVD; 2134 2135 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 2136 if (!listen_cm_id_priv) { 2137 trace_icm_no_listener_err(&cm_id_priv->id); 2138 cm_id_priv->id.state = IB_CM_IDLE; 2139 ret = -EINVAL; 2140 goto destroy; 2141 } 2142 2143 memset(&work->path[0], 0, sizeof(work->path[0])); 2144 if (cm_req_has_alt_path(req_msg)) 2145 memset(&work->path[1], 0, sizeof(work->path[1])); 2146 grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr); 2147 gid_attr = grh->sgid_attr; 2148 2149 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE) { 2150 work->path[0].rec_type = 2151 sa_conv_gid_to_pathrec_type(gid_attr->gid_type); 2152 } else { 2153 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 2154 cm_path_set_rec_type( 2155 work->port->cm_dev->ib_device, work->port->port_num, 2156 &work->path[0], 2157 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, 2158 req_msg)); 2159 } 2160 if (cm_req_has_alt_path(req_msg)) 2161 work->path[1].rec_type = work->path[0].rec_type; 2162 cm_format_paths_from_req(req_msg, &work->path[0], 2163 &work->path[1], work->mad_recv_wc->wc); 2164 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE) 2165 sa_path_set_dmac(&work->path[0], 2166 cm_id_priv->av.ah_attr.roce.dmac); 2167 work->path[0].hop_limit = grh->hop_limit; 2168 2169 /* This destroy call is needed to pair with cm_init_av_for_response */ 2170 cm_destroy_av(&cm_id_priv->av); 2171 ret = cm_init_av_by_path(&work->path[0], gid_attr, &cm_id_priv->av); 2172 if (ret) { 2173 int err; 2174 2175 err = rdma_query_gid(work->port->cm_dev->ib_device, 2176 work->port->port_num, 0, 2177 &work->path[0].sgid); 2178 if (err) 2179 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID, 2180 NULL, 0, NULL, 0); 2181 else 2182 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID, 2183 &work->path[0].sgid, 2184 sizeof(work->path[0].sgid), 2185 NULL, 0); 2186 goto rejected; 2187 } 2188 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_IB) 2189 cm_id_priv->av.dlid_datapath = 2190 IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg); 2191 2192 if (cm_req_has_alt_path(req_msg)) { 2193 ret = cm_init_av_by_path(&work->path[1], NULL, 2194 &cm_id_priv->alt_av); 2195 if (ret) { 2196 ib_send_cm_rej(&cm_id_priv->id, 2197 IB_CM_REJ_INVALID_ALT_GID, 2198 &work->path[0].sgid, 2199 sizeof(work->path[0].sgid), NULL, 0); 2200 goto rejected; 2201 } 2202 } 2203 2204 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 2205 cm_id_priv->id.context = listen_cm_id_priv->id.context; 2206 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 2207 2208 /* Now MAD handlers can see the new ID */ 2209 spin_lock_irq(&cm_id_priv->lock); 2210 cm_finalize_id(cm_id_priv); 2211 2212 /* Refcount belongs to the event, pairs with cm_process_work() */ 2213 refcount_inc(&cm_id_priv->refcount); 2214 cm_queue_work_unlock(cm_id_priv, work); 2215 /* 2216 * Since this ID was just created and was not made visible to other MAD 2217 * handlers until the cm_finalize_id() above we know that the 2218 * cm_process_work() will deliver the event and the listen_cm_id 2219 * embedded in the event can be derefed here. 2220 */ 2221 cm_deref_id(listen_cm_id_priv); 2222 return 0; 2223 2224 rejected: 2225 cm_deref_id(listen_cm_id_priv); 2226 destroy: 2227 ib_destroy_cm_id(&cm_id_priv->id); 2228 return ret; 2229 } 2230 2231 static void cm_format_rep(struct cm_rep_msg *rep_msg, 2232 struct cm_id_private *cm_id_priv, 2233 struct ib_cm_rep_param *param) 2234 { 2235 cm_format_mad_ece_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid, 2236 param->ece.attr_mod); 2237 IBA_SET(CM_REP_LOCAL_COMM_ID, rep_msg, 2238 be32_to_cpu(cm_id_priv->id.local_id)); 2239 IBA_SET(CM_REP_REMOTE_COMM_ID, rep_msg, 2240 be32_to_cpu(cm_id_priv->id.remote_id)); 2241 IBA_SET(CM_REP_STARTING_PSN, rep_msg, param->starting_psn); 2242 IBA_SET(CM_REP_RESPONDER_RESOURCES, rep_msg, 2243 param->responder_resources); 2244 IBA_SET(CM_REP_TARGET_ACK_DELAY, rep_msg, 2245 cm_id_priv->av.port->cm_dev->ack_delay); 2246 IBA_SET(CM_REP_FAILOVER_ACCEPTED, rep_msg, param->failover_accepted); 2247 IBA_SET(CM_REP_RNR_RETRY_COUNT, rep_msg, param->rnr_retry_count); 2248 IBA_SET(CM_REP_LOCAL_CA_GUID, rep_msg, 2249 be64_to_cpu(cm_id_priv->id.device->node_guid)); 2250 2251 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) { 2252 IBA_SET(CM_REP_INITIATOR_DEPTH, rep_msg, 2253 param->initiator_depth); 2254 IBA_SET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg, 2255 param->flow_control); 2256 IBA_SET(CM_REP_SRQ, rep_msg, param->srq); 2257 IBA_SET(CM_REP_LOCAL_QPN, rep_msg, param->qp_num); 2258 } else { 2259 IBA_SET(CM_REP_SRQ, rep_msg, 1); 2260 IBA_SET(CM_REP_LOCAL_EE_CONTEXT_NUMBER, rep_msg, param->qp_num); 2261 } 2262 2263 IBA_SET(CM_REP_VENDOR_ID_L, rep_msg, param->ece.vendor_id); 2264 IBA_SET(CM_REP_VENDOR_ID_M, rep_msg, param->ece.vendor_id >> 8); 2265 IBA_SET(CM_REP_VENDOR_ID_H, rep_msg, param->ece.vendor_id >> 16); 2266 2267 if (param->private_data && param->private_data_len) 2268 IBA_SET_MEM(CM_REP_PRIVATE_DATA, rep_msg, param->private_data, 2269 param->private_data_len); 2270 } 2271 2272 int ib_send_cm_rep(struct ib_cm_id *cm_id, 2273 struct ib_cm_rep_param *param) 2274 { 2275 struct cm_id_private *cm_id_priv; 2276 struct ib_mad_send_buf *msg; 2277 struct cm_rep_msg *rep_msg; 2278 unsigned long flags; 2279 int ret; 2280 2281 if (param->private_data && 2282 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 2283 return -EINVAL; 2284 2285 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2286 spin_lock_irqsave(&cm_id_priv->lock, flags); 2287 if (cm_id->state != IB_CM_REQ_RCVD && 2288 cm_id->state != IB_CM_MRA_REQ_SENT) { 2289 trace_icm_send_rep_err(cm_id_priv->id.local_id, cm_id->state); 2290 ret = -EINVAL; 2291 goto out; 2292 } 2293 2294 msg = cm_alloc_priv_msg(cm_id_priv); 2295 if (IS_ERR(msg)) { 2296 ret = PTR_ERR(msg); 2297 goto out; 2298 } 2299 2300 rep_msg = (struct cm_rep_msg *) msg->mad; 2301 cm_format_rep(rep_msg, cm_id_priv, param); 2302 msg->timeout_ms = cm_id_priv->timeout_ms; 2303 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 2304 2305 trace_icm_send_rep(cm_id); 2306 ret = ib_post_send_mad(msg, NULL); 2307 if (ret) 2308 goto out_free; 2309 2310 cm_id->state = IB_CM_REP_SENT; 2311 cm_id_priv->initiator_depth = param->initiator_depth; 2312 cm_id_priv->responder_resources = param->responder_resources; 2313 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg)); 2314 WARN_ONCE(param->qp_num & 0xFF000000, 2315 "IBTA declares QPN to be 24 bits, but it is 0x%X\n", 2316 param->qp_num); 2317 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF); 2318 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2319 return 0; 2320 2321 out_free: 2322 cm_free_priv_msg(msg); 2323 out: 2324 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2325 return ret; 2326 } 2327 EXPORT_SYMBOL(ib_send_cm_rep); 2328 2329 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 2330 struct cm_id_private *cm_id_priv, 2331 const void *private_data, 2332 u8 private_data_len) 2333 { 2334 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 2335 IBA_SET(CM_RTU_LOCAL_COMM_ID, rtu_msg, 2336 be32_to_cpu(cm_id_priv->id.local_id)); 2337 IBA_SET(CM_RTU_REMOTE_COMM_ID, rtu_msg, 2338 be32_to_cpu(cm_id_priv->id.remote_id)); 2339 2340 if (private_data && private_data_len) 2341 IBA_SET_MEM(CM_RTU_PRIVATE_DATA, rtu_msg, private_data, 2342 private_data_len); 2343 } 2344 2345 int ib_send_cm_rtu(struct ib_cm_id *cm_id, 2346 const void *private_data, 2347 u8 private_data_len) 2348 { 2349 struct cm_id_private *cm_id_priv; 2350 struct ib_mad_send_buf *msg; 2351 unsigned long flags; 2352 void *data; 2353 int ret; 2354 2355 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 2356 return -EINVAL; 2357 2358 data = cm_copy_private_data(private_data, private_data_len); 2359 if (IS_ERR(data)) 2360 return PTR_ERR(data); 2361 2362 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2363 spin_lock_irqsave(&cm_id_priv->lock, flags); 2364 if (cm_id->state != IB_CM_REP_RCVD && 2365 cm_id->state != IB_CM_MRA_REP_SENT) { 2366 trace_icm_send_cm_rtu_err(cm_id); 2367 ret = -EINVAL; 2368 goto error; 2369 } 2370 2371 msg = cm_alloc_msg(cm_id_priv); 2372 if (IS_ERR(msg)) { 2373 ret = PTR_ERR(msg); 2374 goto error; 2375 } 2376 2377 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 2378 private_data, private_data_len); 2379 2380 trace_icm_send_rtu(cm_id); 2381 ret = ib_post_send_mad(msg, NULL); 2382 if (ret) { 2383 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2384 cm_free_msg(msg); 2385 kfree(data); 2386 return ret; 2387 } 2388 2389 cm_id->state = IB_CM_ESTABLISHED; 2390 cm_set_private_data(cm_id_priv, data, private_data_len); 2391 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2392 return 0; 2393 2394 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2395 kfree(data); 2396 return ret; 2397 } 2398 EXPORT_SYMBOL(ib_send_cm_rtu); 2399 2400 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type) 2401 { 2402 struct cm_rep_msg *rep_msg; 2403 struct ib_cm_rep_event_param *param; 2404 2405 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 2406 param = &work->cm_event.param.rep_rcvd; 2407 param->remote_ca_guid = 2408 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg)); 2409 param->remote_qkey = IBA_GET(CM_REP_LOCAL_Q_KEY, rep_msg); 2410 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type)); 2411 param->starting_psn = IBA_GET(CM_REP_STARTING_PSN, rep_msg); 2412 param->responder_resources = IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg); 2413 param->initiator_depth = IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg); 2414 param->target_ack_delay = IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg); 2415 param->failover_accepted = IBA_GET(CM_REP_FAILOVER_ACCEPTED, rep_msg); 2416 param->flow_control = IBA_GET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg); 2417 param->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg); 2418 param->srq = IBA_GET(CM_REP_SRQ, rep_msg); 2419 param->ece.vendor_id = IBA_GET(CM_REP_VENDOR_ID_H, rep_msg) << 16; 2420 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_M, rep_msg) << 8; 2421 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_L, rep_msg); 2422 param->ece.attr_mod = be32_to_cpu(rep_msg->hdr.attr_mod); 2423 2424 work->cm_event.private_data = 2425 IBA_GET_MEM_PTR(CM_REP_PRIVATE_DATA, rep_msg); 2426 } 2427 2428 static void cm_dup_rep_handler(struct cm_work *work) 2429 { 2430 struct cm_id_private *cm_id_priv; 2431 struct cm_rep_msg *rep_msg; 2432 struct ib_mad_send_buf *msg = NULL; 2433 int ret; 2434 2435 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 2436 cm_id_priv = cm_acquire_id( 2437 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 2438 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg))); 2439 if (!cm_id_priv) 2440 return; 2441 2442 atomic_long_inc( 2443 &work->port->counters[CM_RECV_DUPLICATES][CM_REP_COUNTER]); 2444 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 2445 if (ret) 2446 goto deref; 2447 2448 spin_lock_irq(&cm_id_priv->lock); 2449 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 2450 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 2451 cm_id_priv->private_data, 2452 cm_id_priv->private_data_len); 2453 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 2454 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2455 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 2456 cm_id_priv->private_data, 2457 cm_id_priv->private_data_len); 2458 else 2459 goto unlock; 2460 spin_unlock_irq(&cm_id_priv->lock); 2461 2462 trace_icm_send_dup_rep(&cm_id_priv->id); 2463 ret = ib_post_send_mad(msg, NULL); 2464 if (ret) 2465 goto free; 2466 goto deref; 2467 2468 unlock: spin_unlock_irq(&cm_id_priv->lock); 2469 free: cm_free_response_msg(msg); 2470 deref: cm_deref_id(cm_id_priv); 2471 } 2472 2473 static int cm_rep_handler(struct cm_work *work) 2474 { 2475 struct cm_id_private *cm_id_priv; 2476 struct cm_rep_msg *rep_msg; 2477 int ret; 2478 struct cm_id_private *cur_cm_id_priv; 2479 struct cm_timewait_info *timewait_info; 2480 2481 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 2482 cm_id_priv = cm_acquire_id( 2483 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 0); 2484 if (!cm_id_priv) { 2485 cm_dup_rep_handler(work); 2486 trace_icm_remote_no_priv_err( 2487 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2488 return -EINVAL; 2489 } 2490 2491 cm_format_rep_event(work, cm_id_priv->qp_type); 2492 2493 spin_lock_irq(&cm_id_priv->lock); 2494 switch (cm_id_priv->id.state) { 2495 case IB_CM_REQ_SENT: 2496 case IB_CM_MRA_REQ_RCVD: 2497 break; 2498 default: 2499 ret = -EINVAL; 2500 trace_icm_rep_unknown_err( 2501 IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg), 2502 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg), 2503 cm_id_priv->id.state); 2504 spin_unlock_irq(&cm_id_priv->lock); 2505 goto error; 2506 } 2507 2508 cm_id_priv->timewait_info->work.remote_id = 2509 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)); 2510 cm_id_priv->timewait_info->remote_ca_guid = 2511 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg)); 2512 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2513 2514 spin_lock(&cm.lock); 2515 /* Check for duplicate REP. */ 2516 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 2517 spin_unlock(&cm.lock); 2518 spin_unlock_irq(&cm_id_priv->lock); 2519 ret = -EINVAL; 2520 trace_icm_insert_failed_err( 2521 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2522 goto error; 2523 } 2524 /* Check for a stale connection. */ 2525 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 2526 if (timewait_info) { 2527 cm_remove_remote(cm_id_priv); 2528 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2529 timewait_info->work.remote_id); 2530 2531 spin_unlock(&cm.lock); 2532 spin_unlock_irq(&cm_id_priv->lock); 2533 cm_issue_rej(work->port, work->mad_recv_wc, 2534 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 2535 NULL, 0); 2536 ret = -EINVAL; 2537 trace_icm_staleconn_err( 2538 IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg), 2539 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2540 2541 if (cur_cm_id_priv) { 2542 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0); 2543 cm_deref_id(cur_cm_id_priv); 2544 } 2545 2546 goto error; 2547 } 2548 spin_unlock(&cm.lock); 2549 2550 cm_id_priv->id.state = IB_CM_REP_RCVD; 2551 cm_id_priv->id.remote_id = 2552 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)); 2553 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2554 cm_id_priv->initiator_depth = 2555 IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg); 2556 cm_id_priv->responder_resources = 2557 IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg); 2558 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg)); 2559 cm_id_priv->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg); 2560 cm_id_priv->target_ack_delay = 2561 IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg); 2562 cm_id_priv->av.timeout = 2563 cm_ack_timeout(cm_id_priv->target_ack_delay, 2564 cm_id_priv->av.timeout - 1); 2565 cm_id_priv->alt_av.timeout = 2566 cm_ack_timeout(cm_id_priv->target_ack_delay, 2567 cm_id_priv->alt_av.timeout - 1); 2568 2569 ib_cancel_mad(cm_id_priv->msg); 2570 cm_queue_work_unlock(cm_id_priv, work); 2571 return 0; 2572 2573 error: 2574 cm_deref_id(cm_id_priv); 2575 return ret; 2576 } 2577 2578 static int cm_establish_handler(struct cm_work *work) 2579 { 2580 struct cm_id_private *cm_id_priv; 2581 2582 /* See comment in cm_establish about lookup. */ 2583 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 2584 if (!cm_id_priv) 2585 return -EINVAL; 2586 2587 spin_lock_irq(&cm_id_priv->lock); 2588 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 2589 spin_unlock_irq(&cm_id_priv->lock); 2590 goto out; 2591 } 2592 2593 ib_cancel_mad(cm_id_priv->msg); 2594 cm_queue_work_unlock(cm_id_priv, work); 2595 return 0; 2596 out: 2597 cm_deref_id(cm_id_priv); 2598 return -EINVAL; 2599 } 2600 2601 static int cm_rtu_handler(struct cm_work *work) 2602 { 2603 struct cm_id_private *cm_id_priv; 2604 struct cm_rtu_msg *rtu_msg; 2605 2606 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 2607 cm_id_priv = cm_acquire_id( 2608 cpu_to_be32(IBA_GET(CM_RTU_REMOTE_COMM_ID, rtu_msg)), 2609 cpu_to_be32(IBA_GET(CM_RTU_LOCAL_COMM_ID, rtu_msg))); 2610 if (!cm_id_priv) 2611 return -EINVAL; 2612 2613 work->cm_event.private_data = 2614 IBA_GET_MEM_PTR(CM_RTU_PRIVATE_DATA, rtu_msg); 2615 2616 spin_lock_irq(&cm_id_priv->lock); 2617 if (cm_id_priv->id.state != IB_CM_REP_SENT && 2618 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 2619 spin_unlock_irq(&cm_id_priv->lock); 2620 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 2621 [CM_RTU_COUNTER]); 2622 goto out; 2623 } 2624 cm_id_priv->id.state = IB_CM_ESTABLISHED; 2625 2626 ib_cancel_mad(cm_id_priv->msg); 2627 cm_queue_work_unlock(cm_id_priv, work); 2628 return 0; 2629 out: 2630 cm_deref_id(cm_id_priv); 2631 return -EINVAL; 2632 } 2633 2634 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 2635 struct cm_id_private *cm_id_priv, 2636 const void *private_data, 2637 u8 private_data_len) 2638 { 2639 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 2640 cm_form_tid(cm_id_priv)); 2641 IBA_SET(CM_DREQ_LOCAL_COMM_ID, dreq_msg, 2642 be32_to_cpu(cm_id_priv->id.local_id)); 2643 IBA_SET(CM_DREQ_REMOTE_COMM_ID, dreq_msg, 2644 be32_to_cpu(cm_id_priv->id.remote_id)); 2645 IBA_SET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg, 2646 be32_to_cpu(cm_id_priv->remote_qpn)); 2647 2648 if (private_data && private_data_len) 2649 IBA_SET_MEM(CM_DREQ_PRIVATE_DATA, dreq_msg, private_data, 2650 private_data_len); 2651 } 2652 2653 static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv, 2654 const void *private_data, u8 private_data_len) 2655 { 2656 struct ib_mad_send_buf *msg; 2657 int ret; 2658 2659 lockdep_assert_held(&cm_id_priv->lock); 2660 2661 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 2662 return -EINVAL; 2663 2664 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 2665 trace_icm_dreq_skipped(&cm_id_priv->id); 2666 return -EINVAL; 2667 } 2668 2669 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2670 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2671 ib_cancel_mad(cm_id_priv->msg); 2672 2673 msg = cm_alloc_priv_msg(cm_id_priv); 2674 if (IS_ERR(msg)) { 2675 cm_enter_timewait(cm_id_priv); 2676 return PTR_ERR(msg); 2677 } 2678 2679 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 2680 private_data, private_data_len); 2681 msg->timeout_ms = cm_id_priv->timeout_ms; 2682 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2683 2684 trace_icm_send_dreq(&cm_id_priv->id); 2685 ret = ib_post_send_mad(msg, NULL); 2686 if (ret) { 2687 cm_enter_timewait(cm_id_priv); 2688 cm_free_priv_msg(msg); 2689 return ret; 2690 } 2691 2692 cm_id_priv->id.state = IB_CM_DREQ_SENT; 2693 return 0; 2694 } 2695 2696 int ib_send_cm_dreq(struct ib_cm_id *cm_id, const void *private_data, 2697 u8 private_data_len) 2698 { 2699 struct cm_id_private *cm_id_priv = 2700 container_of(cm_id, struct cm_id_private, id); 2701 unsigned long flags; 2702 int ret; 2703 2704 spin_lock_irqsave(&cm_id_priv->lock, flags); 2705 ret = cm_send_dreq_locked(cm_id_priv, private_data, private_data_len); 2706 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2707 return ret; 2708 } 2709 EXPORT_SYMBOL(ib_send_cm_dreq); 2710 2711 static void cm_format_drep(struct cm_drep_msg *drep_msg, 2712 struct cm_id_private *cm_id_priv, 2713 const void *private_data, 2714 u8 private_data_len) 2715 { 2716 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2717 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg, 2718 be32_to_cpu(cm_id_priv->id.local_id)); 2719 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg, 2720 be32_to_cpu(cm_id_priv->id.remote_id)); 2721 2722 if (private_data && private_data_len) 2723 IBA_SET_MEM(CM_DREP_PRIVATE_DATA, drep_msg, private_data, 2724 private_data_len); 2725 } 2726 2727 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv, 2728 void *private_data, u8 private_data_len) 2729 { 2730 struct ib_mad_send_buf *msg; 2731 int ret; 2732 2733 lockdep_assert_held(&cm_id_priv->lock); 2734 2735 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2736 return -EINVAL; 2737 2738 if (cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2739 trace_icm_send_drep_err(&cm_id_priv->id); 2740 kfree(private_data); 2741 return -EINVAL; 2742 } 2743 2744 cm_set_private_data(cm_id_priv, private_data, private_data_len); 2745 cm_enter_timewait(cm_id_priv); 2746 2747 msg = cm_alloc_msg(cm_id_priv); 2748 if (IS_ERR(msg)) 2749 return PTR_ERR(msg); 2750 2751 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2752 private_data, private_data_len); 2753 2754 trace_icm_send_drep(&cm_id_priv->id); 2755 ret = ib_post_send_mad(msg, NULL); 2756 if (ret) { 2757 cm_free_msg(msg); 2758 return ret; 2759 } 2760 return 0; 2761 } 2762 2763 int ib_send_cm_drep(struct ib_cm_id *cm_id, const void *private_data, 2764 u8 private_data_len) 2765 { 2766 struct cm_id_private *cm_id_priv = 2767 container_of(cm_id, struct cm_id_private, id); 2768 unsigned long flags; 2769 void *data; 2770 int ret; 2771 2772 data = cm_copy_private_data(private_data, private_data_len); 2773 if (IS_ERR(data)) 2774 return PTR_ERR(data); 2775 2776 spin_lock_irqsave(&cm_id_priv->lock, flags); 2777 ret = cm_send_drep_locked(cm_id_priv, data, private_data_len); 2778 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2779 return ret; 2780 } 2781 EXPORT_SYMBOL(ib_send_cm_drep); 2782 2783 static int cm_issue_drep(struct cm_port *port, 2784 struct ib_mad_recv_wc *mad_recv_wc) 2785 { 2786 struct ib_mad_send_buf *msg = NULL; 2787 struct cm_dreq_msg *dreq_msg; 2788 struct cm_drep_msg *drep_msg; 2789 int ret; 2790 2791 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2792 if (ret) 2793 return ret; 2794 2795 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2796 drep_msg = (struct cm_drep_msg *) msg->mad; 2797 2798 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2799 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg, 2800 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg)); 2801 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg, 2802 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)); 2803 2804 trace_icm_issue_drep( 2805 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg), 2806 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)); 2807 ret = ib_post_send_mad(msg, NULL); 2808 if (ret) 2809 cm_free_response_msg(msg); 2810 2811 return ret; 2812 } 2813 2814 static int cm_dreq_handler(struct cm_work *work) 2815 { 2816 struct cm_id_private *cm_id_priv; 2817 struct cm_dreq_msg *dreq_msg; 2818 struct ib_mad_send_buf *msg = NULL; 2819 2820 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2821 cm_id_priv = cm_acquire_id( 2822 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)), 2823 cpu_to_be32(IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg))); 2824 if (!cm_id_priv) { 2825 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 2826 [CM_DREQ_COUNTER]); 2827 cm_issue_drep(work->port, work->mad_recv_wc); 2828 trace_icm_no_priv_err( 2829 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg), 2830 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)); 2831 return -EINVAL; 2832 } 2833 2834 work->cm_event.private_data = 2835 IBA_GET_MEM_PTR(CM_DREQ_PRIVATE_DATA, dreq_msg); 2836 2837 spin_lock_irq(&cm_id_priv->lock); 2838 if (cm_id_priv->local_qpn != 2839 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg))) 2840 goto unlock; 2841 2842 switch (cm_id_priv->id.state) { 2843 case IB_CM_REP_SENT: 2844 case IB_CM_DREQ_SENT: 2845 case IB_CM_MRA_REP_RCVD: 2846 ib_cancel_mad(cm_id_priv->msg); 2847 break; 2848 case IB_CM_ESTABLISHED: 2849 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2850 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2851 ib_cancel_mad(cm_id_priv->msg); 2852 break; 2853 case IB_CM_TIMEWAIT: 2854 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 2855 [CM_DREQ_COUNTER]); 2856 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc); 2857 if (IS_ERR(msg)) 2858 goto unlock; 2859 2860 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2861 cm_id_priv->private_data, 2862 cm_id_priv->private_data_len); 2863 spin_unlock_irq(&cm_id_priv->lock); 2864 2865 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || 2866 ib_post_send_mad(msg, NULL)) 2867 cm_free_response_msg(msg); 2868 goto deref; 2869 case IB_CM_DREQ_RCVD: 2870 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 2871 [CM_DREQ_COUNTER]); 2872 goto unlock; 2873 default: 2874 trace_icm_dreq_unknown_err(&cm_id_priv->id); 2875 goto unlock; 2876 } 2877 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2878 cm_id_priv->tid = dreq_msg->hdr.tid; 2879 cm_queue_work_unlock(cm_id_priv, work); 2880 return 0; 2881 2882 unlock: spin_unlock_irq(&cm_id_priv->lock); 2883 deref: cm_deref_id(cm_id_priv); 2884 return -EINVAL; 2885 } 2886 2887 static int cm_drep_handler(struct cm_work *work) 2888 { 2889 struct cm_id_private *cm_id_priv; 2890 struct cm_drep_msg *drep_msg; 2891 2892 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2893 cm_id_priv = cm_acquire_id( 2894 cpu_to_be32(IBA_GET(CM_DREP_REMOTE_COMM_ID, drep_msg)), 2895 cpu_to_be32(IBA_GET(CM_DREP_LOCAL_COMM_ID, drep_msg))); 2896 if (!cm_id_priv) 2897 return -EINVAL; 2898 2899 work->cm_event.private_data = 2900 IBA_GET_MEM_PTR(CM_DREP_PRIVATE_DATA, drep_msg); 2901 2902 spin_lock_irq(&cm_id_priv->lock); 2903 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2904 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2905 spin_unlock_irq(&cm_id_priv->lock); 2906 goto out; 2907 } 2908 cm_enter_timewait(cm_id_priv); 2909 2910 ib_cancel_mad(cm_id_priv->msg); 2911 cm_queue_work_unlock(cm_id_priv, work); 2912 return 0; 2913 out: 2914 cm_deref_id(cm_id_priv); 2915 return -EINVAL; 2916 } 2917 2918 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv, 2919 enum ib_cm_rej_reason reason, void *ari, 2920 u8 ari_length, const void *private_data, 2921 u8 private_data_len) 2922 { 2923 enum ib_cm_state state = cm_id_priv->id.state; 2924 struct ib_mad_send_buf *msg; 2925 int ret; 2926 2927 lockdep_assert_held(&cm_id_priv->lock); 2928 2929 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2930 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2931 return -EINVAL; 2932 2933 trace_icm_send_rej(&cm_id_priv->id, reason); 2934 2935 switch (state) { 2936 case IB_CM_REQ_SENT: 2937 case IB_CM_MRA_REQ_RCVD: 2938 case IB_CM_REQ_RCVD: 2939 case IB_CM_MRA_REQ_SENT: 2940 case IB_CM_REP_RCVD: 2941 case IB_CM_MRA_REP_SENT: 2942 cm_reset_to_idle(cm_id_priv); 2943 msg = cm_alloc_msg(cm_id_priv); 2944 if (IS_ERR(msg)) 2945 return PTR_ERR(msg); 2946 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason, 2947 ari, ari_length, private_data, private_data_len, 2948 state); 2949 break; 2950 case IB_CM_REP_SENT: 2951 case IB_CM_MRA_REP_RCVD: 2952 cm_enter_timewait(cm_id_priv); 2953 msg = cm_alloc_msg(cm_id_priv); 2954 if (IS_ERR(msg)) 2955 return PTR_ERR(msg); 2956 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason, 2957 ari, ari_length, private_data, private_data_len, 2958 state); 2959 break; 2960 default: 2961 trace_icm_send_unknown_rej_err(&cm_id_priv->id); 2962 return -EINVAL; 2963 } 2964 2965 ret = ib_post_send_mad(msg, NULL); 2966 if (ret) { 2967 cm_free_msg(msg); 2968 return ret; 2969 } 2970 2971 return 0; 2972 } 2973 2974 int ib_send_cm_rej(struct ib_cm_id *cm_id, enum ib_cm_rej_reason reason, 2975 void *ari, u8 ari_length, const void *private_data, 2976 u8 private_data_len) 2977 { 2978 struct cm_id_private *cm_id_priv = 2979 container_of(cm_id, struct cm_id_private, id); 2980 unsigned long flags; 2981 int ret; 2982 2983 spin_lock_irqsave(&cm_id_priv->lock, flags); 2984 ret = cm_send_rej_locked(cm_id_priv, reason, ari, ari_length, 2985 private_data, private_data_len); 2986 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2987 return ret; 2988 } 2989 EXPORT_SYMBOL(ib_send_cm_rej); 2990 2991 static void cm_format_rej_event(struct cm_work *work) 2992 { 2993 struct cm_rej_msg *rej_msg; 2994 struct ib_cm_rej_event_param *param; 2995 2996 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2997 param = &work->cm_event.param.rej_rcvd; 2998 param->ari = IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg); 2999 param->ari_length = IBA_GET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg); 3000 param->reason = IBA_GET(CM_REJ_REASON, rej_msg); 3001 work->cm_event.private_data = 3002 IBA_GET_MEM_PTR(CM_REJ_PRIVATE_DATA, rej_msg); 3003 } 3004 3005 static struct cm_id_private *cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 3006 { 3007 struct cm_id_private *cm_id_priv; 3008 __be32 remote_id; 3009 3010 remote_id = cpu_to_be32(IBA_GET(CM_REJ_LOCAL_COMM_ID, rej_msg)); 3011 3012 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_TIMEOUT) { 3013 cm_id_priv = cm_find_remote_id( 3014 *((__be64 *)IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg)), 3015 remote_id); 3016 } else if (IBA_GET(CM_REJ_MESSAGE_REJECTED, rej_msg) == 3017 CM_MSG_RESPONSE_REQ) 3018 cm_id_priv = cm_acquire_id( 3019 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)), 3020 0); 3021 else 3022 cm_id_priv = cm_acquire_id( 3023 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)), 3024 remote_id); 3025 3026 return cm_id_priv; 3027 } 3028 3029 static int cm_rej_handler(struct cm_work *work) 3030 { 3031 struct cm_id_private *cm_id_priv; 3032 struct cm_rej_msg *rej_msg; 3033 3034 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 3035 cm_id_priv = cm_acquire_rejected_id(rej_msg); 3036 if (!cm_id_priv) 3037 return -EINVAL; 3038 3039 cm_format_rej_event(work); 3040 3041 spin_lock_irq(&cm_id_priv->lock); 3042 switch (cm_id_priv->id.state) { 3043 case IB_CM_REQ_SENT: 3044 case IB_CM_MRA_REQ_RCVD: 3045 case IB_CM_REP_SENT: 3046 case IB_CM_MRA_REP_RCVD: 3047 ib_cancel_mad(cm_id_priv->msg); 3048 fallthrough; 3049 case IB_CM_REQ_RCVD: 3050 case IB_CM_MRA_REQ_SENT: 3051 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_STALE_CONN) 3052 cm_enter_timewait(cm_id_priv); 3053 else 3054 cm_reset_to_idle(cm_id_priv); 3055 break; 3056 case IB_CM_DREQ_SENT: 3057 ib_cancel_mad(cm_id_priv->msg); 3058 fallthrough; 3059 case IB_CM_REP_RCVD: 3060 case IB_CM_MRA_REP_SENT: 3061 cm_enter_timewait(cm_id_priv); 3062 break; 3063 case IB_CM_ESTABLISHED: 3064 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT || 3065 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) { 3066 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT) 3067 ib_cancel_mad(cm_id_priv->msg); 3068 cm_enter_timewait(cm_id_priv); 3069 break; 3070 } 3071 fallthrough; 3072 default: 3073 trace_icm_rej_unknown_err(&cm_id_priv->id); 3074 spin_unlock_irq(&cm_id_priv->lock); 3075 goto out; 3076 } 3077 3078 cm_queue_work_unlock(cm_id_priv, work); 3079 return 0; 3080 out: 3081 cm_deref_id(cm_id_priv); 3082 return -EINVAL; 3083 } 3084 3085 int ib_send_cm_mra(struct ib_cm_id *cm_id, 3086 u8 service_timeout, 3087 const void *private_data, 3088 u8 private_data_len) 3089 { 3090 struct cm_id_private *cm_id_priv; 3091 struct ib_mad_send_buf *msg; 3092 enum ib_cm_state cm_state; 3093 enum ib_cm_lap_state lap_state; 3094 enum cm_msg_response msg_response; 3095 void *data; 3096 unsigned long flags; 3097 int ret; 3098 3099 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 3100 return -EINVAL; 3101 3102 data = cm_copy_private_data(private_data, private_data_len); 3103 if (IS_ERR(data)) 3104 return PTR_ERR(data); 3105 3106 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3107 3108 spin_lock_irqsave(&cm_id_priv->lock, flags); 3109 switch (cm_id_priv->id.state) { 3110 case IB_CM_REQ_RCVD: 3111 cm_state = IB_CM_MRA_REQ_SENT; 3112 lap_state = cm_id->lap_state; 3113 msg_response = CM_MSG_RESPONSE_REQ; 3114 break; 3115 case IB_CM_REP_RCVD: 3116 cm_state = IB_CM_MRA_REP_SENT; 3117 lap_state = cm_id->lap_state; 3118 msg_response = CM_MSG_RESPONSE_REP; 3119 break; 3120 case IB_CM_ESTABLISHED: 3121 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 3122 cm_state = cm_id->state; 3123 lap_state = IB_CM_MRA_LAP_SENT; 3124 msg_response = CM_MSG_RESPONSE_OTHER; 3125 break; 3126 } 3127 fallthrough; 3128 default: 3129 trace_icm_send_mra_unknown_err(&cm_id_priv->id); 3130 ret = -EINVAL; 3131 goto error_unlock; 3132 } 3133 3134 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 3135 msg = cm_alloc_msg(cm_id_priv); 3136 if (IS_ERR(msg)) { 3137 ret = PTR_ERR(msg); 3138 goto error_unlock; 3139 } 3140 3141 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 3142 msg_response, service_timeout, 3143 private_data, private_data_len); 3144 trace_icm_send_mra(cm_id); 3145 ret = ib_post_send_mad(msg, NULL); 3146 if (ret) 3147 goto error_free_msg; 3148 } 3149 3150 cm_id->state = cm_state; 3151 cm_id->lap_state = lap_state; 3152 cm_id_priv->service_timeout = service_timeout; 3153 cm_set_private_data(cm_id_priv, data, private_data_len); 3154 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3155 return 0; 3156 3157 error_free_msg: 3158 cm_free_msg(msg); 3159 error_unlock: 3160 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3161 kfree(data); 3162 return ret; 3163 } 3164 EXPORT_SYMBOL(ib_send_cm_mra); 3165 3166 static struct cm_id_private *cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 3167 { 3168 switch (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg)) { 3169 case CM_MSG_RESPONSE_REQ: 3170 return cm_acquire_id( 3171 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)), 3172 0); 3173 case CM_MSG_RESPONSE_REP: 3174 case CM_MSG_RESPONSE_OTHER: 3175 return cm_acquire_id( 3176 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)), 3177 cpu_to_be32(IBA_GET(CM_MRA_LOCAL_COMM_ID, mra_msg))); 3178 default: 3179 return NULL; 3180 } 3181 } 3182 3183 static int cm_mra_handler(struct cm_work *work) 3184 { 3185 struct cm_id_private *cm_id_priv; 3186 struct cm_mra_msg *mra_msg; 3187 int timeout; 3188 3189 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 3190 cm_id_priv = cm_acquire_mraed_id(mra_msg); 3191 if (!cm_id_priv) 3192 return -EINVAL; 3193 3194 work->cm_event.private_data = 3195 IBA_GET_MEM_PTR(CM_MRA_PRIVATE_DATA, mra_msg); 3196 work->cm_event.param.mra_rcvd.service_timeout = 3197 IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg); 3198 timeout = cm_convert_to_ms(IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg)) + 3199 cm_convert_to_ms(cm_id_priv->av.timeout); 3200 3201 spin_lock_irq(&cm_id_priv->lock); 3202 switch (cm_id_priv->id.state) { 3203 case IB_CM_REQ_SENT: 3204 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != 3205 CM_MSG_RESPONSE_REQ || 3206 ib_modify_mad(cm_id_priv->msg, timeout)) 3207 goto out; 3208 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 3209 break; 3210 case IB_CM_REP_SENT: 3211 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != 3212 CM_MSG_RESPONSE_REP || 3213 ib_modify_mad(cm_id_priv->msg, timeout)) 3214 goto out; 3215 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 3216 break; 3217 case IB_CM_ESTABLISHED: 3218 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != 3219 CM_MSG_RESPONSE_OTHER || 3220 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 3221 ib_modify_mad(cm_id_priv->msg, timeout)) { 3222 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 3223 atomic_long_inc( 3224 &work->port->counters[CM_RECV_DUPLICATES] 3225 [CM_MRA_COUNTER]); 3226 goto out; 3227 } 3228 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 3229 break; 3230 case IB_CM_MRA_REQ_RCVD: 3231 case IB_CM_MRA_REP_RCVD: 3232 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 3233 [CM_MRA_COUNTER]); 3234 fallthrough; 3235 default: 3236 trace_icm_mra_unknown_err(&cm_id_priv->id); 3237 goto out; 3238 } 3239 3240 cm_id_priv->msg->context[1] = (void *) (unsigned long) 3241 cm_id_priv->id.state; 3242 cm_queue_work_unlock(cm_id_priv, work); 3243 return 0; 3244 out: 3245 spin_unlock_irq(&cm_id_priv->lock); 3246 cm_deref_id(cm_id_priv); 3247 return -EINVAL; 3248 } 3249 3250 static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg, 3251 struct sa_path_rec *path) 3252 { 3253 u32 lid; 3254 3255 if (path->rec_type != SA_PATH_REC_TYPE_OPA) { 3256 sa_path_set_dlid(path, IBA_GET(CM_LAP_ALTERNATE_LOCAL_PORT_LID, 3257 lap_msg)); 3258 sa_path_set_slid(path, IBA_GET(CM_LAP_ALTERNATE_REMOTE_PORT_LID, 3259 lap_msg)); 3260 } else { 3261 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 3262 CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg)); 3263 sa_path_set_dlid(path, lid); 3264 3265 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 3266 CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg)); 3267 sa_path_set_slid(path, lid); 3268 } 3269 } 3270 3271 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 3272 struct sa_path_rec *path, 3273 struct cm_lap_msg *lap_msg) 3274 { 3275 path->dgid = *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg); 3276 path->sgid = 3277 *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg); 3278 path->flow_label = 3279 cpu_to_be32(IBA_GET(CM_LAP_ALTERNATE_FLOW_LABEL, lap_msg)); 3280 path->hop_limit = IBA_GET(CM_LAP_ALTERNATE_HOP_LIMIT, lap_msg); 3281 path->traffic_class = IBA_GET(CM_LAP_ALTERNATE_TRAFFIC_CLASS, lap_msg); 3282 path->reversible = 1; 3283 path->pkey = cm_id_priv->pkey; 3284 path->sl = IBA_GET(CM_LAP_ALTERNATE_SL, lap_msg); 3285 path->mtu_selector = IB_SA_EQ; 3286 path->mtu = cm_id_priv->path_mtu; 3287 path->rate_selector = IB_SA_EQ; 3288 path->rate = IBA_GET(CM_LAP_ALTERNATE_PACKET_RATE, lap_msg); 3289 path->packet_life_time_selector = IB_SA_EQ; 3290 path->packet_life_time = 3291 IBA_GET(CM_LAP_ALTERNATE_LOCAL_ACK_TIMEOUT, lap_msg); 3292 path->packet_life_time -= (path->packet_life_time > 0); 3293 cm_format_path_lid_from_lap(lap_msg, path); 3294 } 3295 3296 static int cm_lap_handler(struct cm_work *work) 3297 { 3298 struct cm_id_private *cm_id_priv; 3299 struct cm_lap_msg *lap_msg; 3300 struct ib_cm_lap_event_param *param; 3301 struct ib_mad_send_buf *msg = NULL; 3302 struct rdma_ah_attr ah_attr; 3303 struct cm_av alt_av = {}; 3304 int ret; 3305 3306 /* Currently Alternate path messages are not supported for 3307 * RoCE link layer. 3308 */ 3309 if (rdma_protocol_roce(work->port->cm_dev->ib_device, 3310 work->port->port_num)) 3311 return -EINVAL; 3312 3313 /* todo: verify LAP request and send reject APR if invalid. */ 3314 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 3315 cm_id_priv = cm_acquire_id( 3316 cpu_to_be32(IBA_GET(CM_LAP_REMOTE_COMM_ID, lap_msg)), 3317 cpu_to_be32(IBA_GET(CM_LAP_LOCAL_COMM_ID, lap_msg))); 3318 if (!cm_id_priv) 3319 return -EINVAL; 3320 3321 param = &work->cm_event.param.lap_rcvd; 3322 memset(&work->path[0], 0, sizeof(work->path[1])); 3323 cm_path_set_rec_type(work->port->cm_dev->ib_device, 3324 work->port->port_num, &work->path[0], 3325 IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, 3326 lap_msg)); 3327 param->alternate_path = &work->path[0]; 3328 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 3329 work->cm_event.private_data = 3330 IBA_GET_MEM_PTR(CM_LAP_PRIVATE_DATA, lap_msg); 3331 3332 ret = ib_init_ah_attr_from_wc(work->port->cm_dev->ib_device, 3333 work->port->port_num, 3334 work->mad_recv_wc->wc, 3335 work->mad_recv_wc->recv_buf.grh, 3336 &ah_attr); 3337 if (ret) 3338 goto deref; 3339 3340 ret = cm_init_av_by_path(param->alternate_path, NULL, &alt_av); 3341 if (ret) { 3342 rdma_destroy_ah_attr(&ah_attr); 3343 goto deref; 3344 } 3345 3346 spin_lock_irq(&cm_id_priv->lock); 3347 cm_init_av_for_lap(work->port, work->mad_recv_wc->wc, 3348 &ah_attr, &cm_id_priv->av); 3349 cm_move_av_from_path(&cm_id_priv->alt_av, &alt_av); 3350 3351 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 3352 goto unlock; 3353 3354 switch (cm_id_priv->id.lap_state) { 3355 case IB_CM_LAP_UNINIT: 3356 case IB_CM_LAP_IDLE: 3357 break; 3358 case IB_CM_MRA_LAP_SENT: 3359 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 3360 [CM_LAP_COUNTER]); 3361 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc); 3362 if (IS_ERR(msg)) 3363 goto unlock; 3364 3365 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 3366 CM_MSG_RESPONSE_OTHER, 3367 cm_id_priv->service_timeout, 3368 cm_id_priv->private_data, 3369 cm_id_priv->private_data_len); 3370 spin_unlock_irq(&cm_id_priv->lock); 3371 3372 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || 3373 ib_post_send_mad(msg, NULL)) 3374 cm_free_response_msg(msg); 3375 goto deref; 3376 case IB_CM_LAP_RCVD: 3377 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 3378 [CM_LAP_COUNTER]); 3379 goto unlock; 3380 default: 3381 goto unlock; 3382 } 3383 3384 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 3385 cm_id_priv->tid = lap_msg->hdr.tid; 3386 cm_queue_work_unlock(cm_id_priv, work); 3387 return 0; 3388 3389 unlock: spin_unlock_irq(&cm_id_priv->lock); 3390 deref: cm_deref_id(cm_id_priv); 3391 return -EINVAL; 3392 } 3393 3394 static int cm_apr_handler(struct cm_work *work) 3395 { 3396 struct cm_id_private *cm_id_priv; 3397 struct cm_apr_msg *apr_msg; 3398 3399 /* Currently Alternate path messages are not supported for 3400 * RoCE link layer. 3401 */ 3402 if (rdma_protocol_roce(work->port->cm_dev->ib_device, 3403 work->port->port_num)) 3404 return -EINVAL; 3405 3406 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 3407 cm_id_priv = cm_acquire_id( 3408 cpu_to_be32(IBA_GET(CM_APR_REMOTE_COMM_ID, apr_msg)), 3409 cpu_to_be32(IBA_GET(CM_APR_LOCAL_COMM_ID, apr_msg))); 3410 if (!cm_id_priv) 3411 return -EINVAL; /* Unmatched reply. */ 3412 3413 work->cm_event.param.apr_rcvd.ap_status = 3414 IBA_GET(CM_APR_AR_STATUS, apr_msg); 3415 work->cm_event.param.apr_rcvd.apr_info = 3416 IBA_GET_MEM_PTR(CM_APR_ADDITIONAL_INFORMATION, apr_msg); 3417 work->cm_event.param.apr_rcvd.info_len = 3418 IBA_GET(CM_APR_ADDITIONAL_INFORMATION_LENGTH, apr_msg); 3419 work->cm_event.private_data = 3420 IBA_GET_MEM_PTR(CM_APR_PRIVATE_DATA, apr_msg); 3421 3422 spin_lock_irq(&cm_id_priv->lock); 3423 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 3424 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 3425 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 3426 spin_unlock_irq(&cm_id_priv->lock); 3427 goto out; 3428 } 3429 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 3430 ib_cancel_mad(cm_id_priv->msg); 3431 cm_queue_work_unlock(cm_id_priv, work); 3432 return 0; 3433 out: 3434 cm_deref_id(cm_id_priv); 3435 return -EINVAL; 3436 } 3437 3438 static int cm_timewait_handler(struct cm_work *work) 3439 { 3440 struct cm_timewait_info *timewait_info; 3441 struct cm_id_private *cm_id_priv; 3442 3443 timewait_info = container_of(work, struct cm_timewait_info, work); 3444 spin_lock_irq(&cm.lock); 3445 list_del(&timewait_info->list); 3446 spin_unlock_irq(&cm.lock); 3447 3448 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 3449 timewait_info->work.remote_id); 3450 if (!cm_id_priv) 3451 return -EINVAL; 3452 3453 spin_lock_irq(&cm_id_priv->lock); 3454 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 3455 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 3456 spin_unlock_irq(&cm_id_priv->lock); 3457 goto out; 3458 } 3459 cm_id_priv->id.state = IB_CM_IDLE; 3460 cm_queue_work_unlock(cm_id_priv, work); 3461 return 0; 3462 out: 3463 cm_deref_id(cm_id_priv); 3464 return -EINVAL; 3465 } 3466 3467 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 3468 struct cm_id_private *cm_id_priv, 3469 struct ib_cm_sidr_req_param *param) 3470 { 3471 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 3472 cm_form_tid(cm_id_priv)); 3473 IBA_SET(CM_SIDR_REQ_REQUESTID, sidr_req_msg, 3474 be32_to_cpu(cm_id_priv->id.local_id)); 3475 IBA_SET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg, 3476 be16_to_cpu(param->path->pkey)); 3477 IBA_SET(CM_SIDR_REQ_SERVICEID, sidr_req_msg, 3478 be64_to_cpu(param->service_id)); 3479 3480 if (param->private_data && param->private_data_len) 3481 IBA_SET_MEM(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg, 3482 param->private_data, param->private_data_len); 3483 } 3484 3485 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 3486 struct ib_cm_sidr_req_param *param) 3487 { 3488 struct cm_id_private *cm_id_priv; 3489 struct ib_mad_send_buf *msg; 3490 struct cm_av av = {}; 3491 unsigned long flags; 3492 int ret; 3493 3494 if (!param->path || (param->private_data && 3495 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 3496 return -EINVAL; 3497 3498 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3499 ret = cm_init_av_by_path(param->path, param->sgid_attr, &av); 3500 if (ret) 3501 return ret; 3502 3503 spin_lock_irqsave(&cm_id_priv->lock, flags); 3504 cm_move_av_from_path(&cm_id_priv->av, &av); 3505 cm_id->service_id = param->service_id; 3506 cm_id_priv->timeout_ms = param->timeout_ms; 3507 cm_id_priv->max_cm_retries = param->max_cm_retries; 3508 if (cm_id->state != IB_CM_IDLE) { 3509 ret = -EINVAL; 3510 goto out_unlock; 3511 } 3512 3513 msg = cm_alloc_priv_msg(cm_id_priv); 3514 if (IS_ERR(msg)) { 3515 ret = PTR_ERR(msg); 3516 goto out_unlock; 3517 } 3518 3519 cm_format_sidr_req((struct cm_sidr_req_msg *)msg->mad, cm_id_priv, 3520 param); 3521 msg->timeout_ms = cm_id_priv->timeout_ms; 3522 msg->context[1] = (void *)(unsigned long)IB_CM_SIDR_REQ_SENT; 3523 3524 trace_icm_send_sidr_req(&cm_id_priv->id); 3525 ret = ib_post_send_mad(msg, NULL); 3526 if (ret) 3527 goto out_free; 3528 cm_id->state = IB_CM_SIDR_REQ_SENT; 3529 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3530 return 0; 3531 out_free: 3532 cm_free_priv_msg(msg); 3533 out_unlock: 3534 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3535 return ret; 3536 } 3537 EXPORT_SYMBOL(ib_send_cm_sidr_req); 3538 3539 static void cm_format_sidr_req_event(struct cm_work *work, 3540 const struct cm_id_private *rx_cm_id, 3541 struct ib_cm_id *listen_id) 3542 { 3543 struct cm_sidr_req_msg *sidr_req_msg; 3544 struct ib_cm_sidr_req_event_param *param; 3545 3546 sidr_req_msg = (struct cm_sidr_req_msg *) 3547 work->mad_recv_wc->recv_buf.mad; 3548 param = &work->cm_event.param.sidr_req_rcvd; 3549 param->pkey = IBA_GET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg); 3550 param->listen_id = listen_id; 3551 param->service_id = 3552 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg)); 3553 param->bth_pkey = cm_get_bth_pkey(work); 3554 param->port = work->port->port_num; 3555 param->sgid_attr = rx_cm_id->av.ah_attr.grh.sgid_attr; 3556 work->cm_event.private_data = 3557 IBA_GET_MEM_PTR(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg); 3558 } 3559 3560 static int cm_sidr_req_handler(struct cm_work *work) 3561 { 3562 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 3563 struct cm_sidr_req_msg *sidr_req_msg; 3564 struct ib_wc *wc; 3565 int ret; 3566 3567 cm_id_priv = 3568 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL); 3569 if (IS_ERR(cm_id_priv)) 3570 return PTR_ERR(cm_id_priv); 3571 3572 /* Record SGID/SLID and request ID for lookup. */ 3573 sidr_req_msg = (struct cm_sidr_req_msg *) 3574 work->mad_recv_wc->recv_buf.mad; 3575 3576 cm_id_priv->id.remote_id = 3577 cpu_to_be32(IBA_GET(CM_SIDR_REQ_REQUESTID, sidr_req_msg)); 3578 cm_id_priv->id.service_id = 3579 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg)); 3580 cm_id_priv->tid = sidr_req_msg->hdr.tid; 3581 3582 wc = work->mad_recv_wc->wc; 3583 cm_id_priv->sidr_slid = wc->slid; 3584 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 3585 work->mad_recv_wc->recv_buf.grh, 3586 &cm_id_priv->av); 3587 if (ret) 3588 goto out; 3589 3590 spin_lock_irq(&cm.lock); 3591 listen_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 3592 if (listen_cm_id_priv) { 3593 spin_unlock_irq(&cm.lock); 3594 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 3595 [CM_SIDR_REQ_COUNTER]); 3596 goto out; /* Duplicate message. */ 3597 } 3598 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3599 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 3600 cm_id_priv->id.service_id); 3601 if (!listen_cm_id_priv) { 3602 spin_unlock_irq(&cm.lock); 3603 ib_send_cm_sidr_rep(&cm_id_priv->id, 3604 &(struct ib_cm_sidr_rep_param){ 3605 .status = IB_SIDR_UNSUPPORTED }); 3606 goto out; /* No match. */ 3607 } 3608 spin_unlock_irq(&cm.lock); 3609 3610 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 3611 cm_id_priv->id.context = listen_cm_id_priv->id.context; 3612 3613 /* 3614 * A SIDR ID does not need to be in the xarray since it does not receive 3615 * mads, is not placed in the remote_id or remote_qpn rbtree, and does 3616 * not enter timewait. 3617 */ 3618 3619 cm_format_sidr_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 3620 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 3621 cm_free_work(work); 3622 /* 3623 * A pointer to the listen_cm_id is held in the event, so this deref 3624 * must be after the event is delivered above. 3625 */ 3626 cm_deref_id(listen_cm_id_priv); 3627 if (ret) 3628 cm_destroy_id(&cm_id_priv->id, ret); 3629 return 0; 3630 out: 3631 ib_destroy_cm_id(&cm_id_priv->id); 3632 return -EINVAL; 3633 } 3634 3635 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3636 struct cm_id_private *cm_id_priv, 3637 struct ib_cm_sidr_rep_param *param) 3638 { 3639 cm_format_mad_ece_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3640 cm_id_priv->tid, param->ece.attr_mod); 3641 IBA_SET(CM_SIDR_REP_REQUESTID, sidr_rep_msg, 3642 be32_to_cpu(cm_id_priv->id.remote_id)); 3643 IBA_SET(CM_SIDR_REP_STATUS, sidr_rep_msg, param->status); 3644 IBA_SET(CM_SIDR_REP_QPN, sidr_rep_msg, param->qp_num); 3645 IBA_SET(CM_SIDR_REP_SERVICEID, sidr_rep_msg, 3646 be64_to_cpu(cm_id_priv->id.service_id)); 3647 IBA_SET(CM_SIDR_REP_Q_KEY, sidr_rep_msg, param->qkey); 3648 IBA_SET(CM_SIDR_REP_VENDOR_ID_L, sidr_rep_msg, 3649 param->ece.vendor_id & 0xFF); 3650 IBA_SET(CM_SIDR_REP_VENDOR_ID_H, sidr_rep_msg, 3651 (param->ece.vendor_id >> 8) & 0xFF); 3652 3653 if (param->info && param->info_length) 3654 IBA_SET_MEM(CM_SIDR_REP_ADDITIONAL_INFORMATION, sidr_rep_msg, 3655 param->info, param->info_length); 3656 3657 if (param->private_data && param->private_data_len) 3658 IBA_SET_MEM(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg, 3659 param->private_data, param->private_data_len); 3660 } 3661 3662 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv, 3663 struct ib_cm_sidr_rep_param *param) 3664 { 3665 struct ib_mad_send_buf *msg; 3666 unsigned long flags; 3667 int ret; 3668 3669 lockdep_assert_held(&cm_id_priv->lock); 3670 3671 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3672 (param->private_data && 3673 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3674 return -EINVAL; 3675 3676 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_RCVD) 3677 return -EINVAL; 3678 3679 msg = cm_alloc_msg(cm_id_priv); 3680 if (IS_ERR(msg)) 3681 return PTR_ERR(msg); 3682 3683 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3684 param); 3685 trace_icm_send_sidr_rep(&cm_id_priv->id); 3686 ret = ib_post_send_mad(msg, NULL); 3687 if (ret) { 3688 cm_free_msg(msg); 3689 return ret; 3690 } 3691 cm_id_priv->id.state = IB_CM_IDLE; 3692 spin_lock_irqsave(&cm.lock, flags); 3693 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) { 3694 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3695 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); 3696 } 3697 spin_unlock_irqrestore(&cm.lock, flags); 3698 return 0; 3699 } 3700 3701 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3702 struct ib_cm_sidr_rep_param *param) 3703 { 3704 struct cm_id_private *cm_id_priv = 3705 container_of(cm_id, struct cm_id_private, id); 3706 unsigned long flags; 3707 int ret; 3708 3709 spin_lock_irqsave(&cm_id_priv->lock, flags); 3710 ret = cm_send_sidr_rep_locked(cm_id_priv, param); 3711 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3712 return ret; 3713 } 3714 EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3715 3716 static void cm_format_sidr_rep_event(struct cm_work *work, 3717 const struct cm_id_private *cm_id_priv) 3718 { 3719 struct cm_sidr_rep_msg *sidr_rep_msg; 3720 struct ib_cm_sidr_rep_event_param *param; 3721 3722 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3723 work->mad_recv_wc->recv_buf.mad; 3724 param = &work->cm_event.param.sidr_rep_rcvd; 3725 param->status = IBA_GET(CM_SIDR_REP_STATUS, sidr_rep_msg); 3726 param->qkey = IBA_GET(CM_SIDR_REP_Q_KEY, sidr_rep_msg); 3727 param->qpn = IBA_GET(CM_SIDR_REP_QPN, sidr_rep_msg); 3728 param->info = IBA_GET_MEM_PTR(CM_SIDR_REP_ADDITIONAL_INFORMATION, 3729 sidr_rep_msg); 3730 param->info_len = IBA_GET(CM_SIDR_REP_ADDITIONAL_INFORMATION_LENGTH, 3731 sidr_rep_msg); 3732 param->sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr; 3733 work->cm_event.private_data = 3734 IBA_GET_MEM_PTR(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg); 3735 } 3736 3737 static int cm_sidr_rep_handler(struct cm_work *work) 3738 { 3739 struct cm_sidr_rep_msg *sidr_rep_msg; 3740 struct cm_id_private *cm_id_priv; 3741 3742 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3743 work->mad_recv_wc->recv_buf.mad; 3744 cm_id_priv = cm_acquire_id( 3745 cpu_to_be32(IBA_GET(CM_SIDR_REP_REQUESTID, sidr_rep_msg)), 0); 3746 if (!cm_id_priv) 3747 return -EINVAL; /* Unmatched reply. */ 3748 3749 spin_lock_irq(&cm_id_priv->lock); 3750 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3751 spin_unlock_irq(&cm_id_priv->lock); 3752 goto out; 3753 } 3754 cm_id_priv->id.state = IB_CM_IDLE; 3755 ib_cancel_mad(cm_id_priv->msg); 3756 spin_unlock_irq(&cm_id_priv->lock); 3757 3758 cm_format_sidr_rep_event(work, cm_id_priv); 3759 cm_process_work(cm_id_priv, work); 3760 return 0; 3761 out: 3762 cm_deref_id(cm_id_priv); 3763 return -EINVAL; 3764 } 3765 3766 static void cm_process_send_error(struct cm_id_private *cm_id_priv, 3767 struct ib_mad_send_buf *msg, 3768 enum ib_cm_state state, 3769 enum ib_wc_status wc_status) 3770 { 3771 struct ib_cm_event cm_event = {}; 3772 int ret; 3773 3774 /* Discard old sends or ones without a response. */ 3775 spin_lock_irq(&cm_id_priv->lock); 3776 if (msg != cm_id_priv->msg) { 3777 spin_unlock_irq(&cm_id_priv->lock); 3778 cm_free_msg(msg); 3779 return; 3780 } 3781 cm_free_priv_msg(msg); 3782 3783 if (state != cm_id_priv->id.state || wc_status == IB_WC_SUCCESS || 3784 wc_status == IB_WC_WR_FLUSH_ERR) 3785 goto out_unlock; 3786 3787 trace_icm_mad_send_err(state, wc_status); 3788 switch (state) { 3789 case IB_CM_REQ_SENT: 3790 case IB_CM_MRA_REQ_RCVD: 3791 cm_reset_to_idle(cm_id_priv); 3792 cm_event.event = IB_CM_REQ_ERROR; 3793 break; 3794 case IB_CM_REP_SENT: 3795 case IB_CM_MRA_REP_RCVD: 3796 cm_reset_to_idle(cm_id_priv); 3797 cm_event.event = IB_CM_REP_ERROR; 3798 break; 3799 case IB_CM_DREQ_SENT: 3800 cm_enter_timewait(cm_id_priv); 3801 cm_event.event = IB_CM_DREQ_ERROR; 3802 break; 3803 case IB_CM_SIDR_REQ_SENT: 3804 cm_id_priv->id.state = IB_CM_IDLE; 3805 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3806 break; 3807 default: 3808 goto out_unlock; 3809 } 3810 spin_unlock_irq(&cm_id_priv->lock); 3811 cm_event.param.send_status = wc_status; 3812 3813 /* No other events can occur on the cm_id at this point. */ 3814 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3815 if (ret) 3816 ib_destroy_cm_id(&cm_id_priv->id); 3817 return; 3818 out_unlock: 3819 spin_unlock_irq(&cm_id_priv->lock); 3820 } 3821 3822 static void cm_send_handler(struct ib_mad_agent *mad_agent, 3823 struct ib_mad_send_wc *mad_send_wc) 3824 { 3825 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3826 struct cm_id_private *cm_id_priv = msg->context[0]; 3827 enum ib_cm_state state = 3828 (enum ib_cm_state)(unsigned long)msg->context[1]; 3829 struct cm_port *port; 3830 u16 attr_index; 3831 3832 port = mad_agent->context; 3833 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3834 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3835 3836 /* 3837 * If the send was in response to a received message (context[0] is not 3838 * set to a cm_id), and is not a REJ, then it is a send that was 3839 * manually retried. 3840 */ 3841 if (!cm_id_priv && (attr_index != CM_REJ_COUNTER)) 3842 msg->retries = 1; 3843 3844 atomic_long_add(1 + msg->retries, &port->counters[CM_XMIT][attr_index]); 3845 if (msg->retries) 3846 atomic_long_add(msg->retries, 3847 &port->counters[CM_XMIT_RETRIES][attr_index]); 3848 3849 if (cm_id_priv) 3850 cm_process_send_error(cm_id_priv, msg, state, 3851 mad_send_wc->status); 3852 else 3853 cm_free_response_msg(msg); 3854 } 3855 3856 static void cm_work_handler(struct work_struct *_work) 3857 { 3858 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3859 int ret; 3860 3861 switch (work->cm_event.event) { 3862 case IB_CM_REQ_RECEIVED: 3863 ret = cm_req_handler(work); 3864 break; 3865 case IB_CM_MRA_RECEIVED: 3866 ret = cm_mra_handler(work); 3867 break; 3868 case IB_CM_REJ_RECEIVED: 3869 ret = cm_rej_handler(work); 3870 break; 3871 case IB_CM_REP_RECEIVED: 3872 ret = cm_rep_handler(work); 3873 break; 3874 case IB_CM_RTU_RECEIVED: 3875 ret = cm_rtu_handler(work); 3876 break; 3877 case IB_CM_USER_ESTABLISHED: 3878 ret = cm_establish_handler(work); 3879 break; 3880 case IB_CM_DREQ_RECEIVED: 3881 ret = cm_dreq_handler(work); 3882 break; 3883 case IB_CM_DREP_RECEIVED: 3884 ret = cm_drep_handler(work); 3885 break; 3886 case IB_CM_SIDR_REQ_RECEIVED: 3887 ret = cm_sidr_req_handler(work); 3888 break; 3889 case IB_CM_SIDR_REP_RECEIVED: 3890 ret = cm_sidr_rep_handler(work); 3891 break; 3892 case IB_CM_LAP_RECEIVED: 3893 ret = cm_lap_handler(work); 3894 break; 3895 case IB_CM_APR_RECEIVED: 3896 ret = cm_apr_handler(work); 3897 break; 3898 case IB_CM_TIMEWAIT_EXIT: 3899 ret = cm_timewait_handler(work); 3900 break; 3901 default: 3902 trace_icm_handler_err(work->cm_event.event); 3903 ret = -EINVAL; 3904 break; 3905 } 3906 if (ret) 3907 cm_free_work(work); 3908 } 3909 3910 static int cm_establish(struct ib_cm_id *cm_id) 3911 { 3912 struct cm_id_private *cm_id_priv; 3913 struct cm_work *work; 3914 unsigned long flags; 3915 int ret = 0; 3916 struct cm_device *cm_dev; 3917 3918 cm_dev = ib_get_client_data(cm_id->device, &cm_client); 3919 if (!cm_dev) 3920 return -ENODEV; 3921 3922 work = kmalloc(sizeof *work, GFP_ATOMIC); 3923 if (!work) 3924 return -ENOMEM; 3925 3926 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3927 spin_lock_irqsave(&cm_id_priv->lock, flags); 3928 switch (cm_id->state) { 3929 case IB_CM_REP_SENT: 3930 case IB_CM_MRA_REP_RCVD: 3931 cm_id->state = IB_CM_ESTABLISHED; 3932 break; 3933 case IB_CM_ESTABLISHED: 3934 ret = -EISCONN; 3935 break; 3936 default: 3937 trace_icm_establish_err(cm_id); 3938 ret = -EINVAL; 3939 break; 3940 } 3941 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3942 3943 if (ret) { 3944 kfree(work); 3945 goto out; 3946 } 3947 3948 /* 3949 * The CM worker thread may try to destroy the cm_id before it 3950 * can execute this work item. To prevent potential deadlock, 3951 * we need to find the cm_id once we're in the context of the 3952 * worker thread, rather than holding a reference on it. 3953 */ 3954 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3955 work->local_id = cm_id->local_id; 3956 work->remote_id = cm_id->remote_id; 3957 work->mad_recv_wc = NULL; 3958 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3959 3960 /* Check if the device started its remove_one */ 3961 spin_lock_irqsave(&cm.lock, flags); 3962 if (!cm_dev->going_down) { 3963 queue_delayed_work(cm.wq, &work->work, 0); 3964 } else { 3965 kfree(work); 3966 ret = -ENODEV; 3967 } 3968 spin_unlock_irqrestore(&cm.lock, flags); 3969 3970 out: 3971 return ret; 3972 } 3973 3974 static int cm_migrate(struct ib_cm_id *cm_id) 3975 { 3976 struct cm_id_private *cm_id_priv; 3977 unsigned long flags; 3978 int ret = 0; 3979 3980 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3981 spin_lock_irqsave(&cm_id_priv->lock, flags); 3982 if (cm_id->state == IB_CM_ESTABLISHED && 3983 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3984 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3985 cm_id->lap_state = IB_CM_LAP_IDLE; 3986 cm_id_priv->av = cm_id_priv->alt_av; 3987 } else 3988 ret = -EINVAL; 3989 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3990 3991 return ret; 3992 } 3993 3994 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3995 { 3996 int ret; 3997 3998 switch (event) { 3999 case IB_EVENT_COMM_EST: 4000 ret = cm_establish(cm_id); 4001 break; 4002 case IB_EVENT_PATH_MIG: 4003 ret = cm_migrate(cm_id); 4004 break; 4005 default: 4006 ret = -EINVAL; 4007 } 4008 return ret; 4009 } 4010 EXPORT_SYMBOL(ib_cm_notify); 4011 4012 static void cm_recv_handler(struct ib_mad_agent *mad_agent, 4013 struct ib_mad_send_buf *send_buf, 4014 struct ib_mad_recv_wc *mad_recv_wc) 4015 { 4016 struct cm_port *port = mad_agent->context; 4017 struct cm_work *work; 4018 enum ib_cm_event_type event; 4019 bool alt_path = false; 4020 u16 attr_id; 4021 int paths = 0; 4022 int going_down = 0; 4023 4024 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 4025 case CM_REQ_ATTR_ID: 4026 alt_path = cm_req_has_alt_path((struct cm_req_msg *) 4027 mad_recv_wc->recv_buf.mad); 4028 paths = 1 + (alt_path != 0); 4029 event = IB_CM_REQ_RECEIVED; 4030 break; 4031 case CM_MRA_ATTR_ID: 4032 event = IB_CM_MRA_RECEIVED; 4033 break; 4034 case CM_REJ_ATTR_ID: 4035 event = IB_CM_REJ_RECEIVED; 4036 break; 4037 case CM_REP_ATTR_ID: 4038 event = IB_CM_REP_RECEIVED; 4039 break; 4040 case CM_RTU_ATTR_ID: 4041 event = IB_CM_RTU_RECEIVED; 4042 break; 4043 case CM_DREQ_ATTR_ID: 4044 event = IB_CM_DREQ_RECEIVED; 4045 break; 4046 case CM_DREP_ATTR_ID: 4047 event = IB_CM_DREP_RECEIVED; 4048 break; 4049 case CM_SIDR_REQ_ATTR_ID: 4050 event = IB_CM_SIDR_REQ_RECEIVED; 4051 break; 4052 case CM_SIDR_REP_ATTR_ID: 4053 event = IB_CM_SIDR_REP_RECEIVED; 4054 break; 4055 case CM_LAP_ATTR_ID: 4056 paths = 1; 4057 event = IB_CM_LAP_RECEIVED; 4058 break; 4059 case CM_APR_ATTR_ID: 4060 event = IB_CM_APR_RECEIVED; 4061 break; 4062 default: 4063 ib_free_recv_mad(mad_recv_wc); 4064 return; 4065 } 4066 4067 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 4068 atomic_long_inc(&port->counters[CM_RECV][attr_id - CM_ATTR_ID_OFFSET]); 4069 4070 work = kmalloc(struct_size(work, path, paths), GFP_KERNEL); 4071 if (!work) { 4072 ib_free_recv_mad(mad_recv_wc); 4073 return; 4074 } 4075 4076 INIT_DELAYED_WORK(&work->work, cm_work_handler); 4077 work->cm_event.event = event; 4078 work->mad_recv_wc = mad_recv_wc; 4079 work->port = port; 4080 4081 /* Check if the device started its remove_one */ 4082 spin_lock_irq(&cm.lock); 4083 if (!port->cm_dev->going_down) 4084 queue_delayed_work(cm.wq, &work->work, 0); 4085 else 4086 going_down = 1; 4087 spin_unlock_irq(&cm.lock); 4088 4089 if (going_down) { 4090 kfree(work); 4091 ib_free_recv_mad(mad_recv_wc); 4092 } 4093 } 4094 4095 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 4096 struct ib_qp_attr *qp_attr, 4097 int *qp_attr_mask) 4098 { 4099 unsigned long flags; 4100 int ret; 4101 4102 spin_lock_irqsave(&cm_id_priv->lock, flags); 4103 switch (cm_id_priv->id.state) { 4104 case IB_CM_REQ_SENT: 4105 case IB_CM_MRA_REQ_RCVD: 4106 case IB_CM_REQ_RCVD: 4107 case IB_CM_MRA_REQ_SENT: 4108 case IB_CM_REP_RCVD: 4109 case IB_CM_MRA_REP_SENT: 4110 case IB_CM_REP_SENT: 4111 case IB_CM_MRA_REP_RCVD: 4112 case IB_CM_ESTABLISHED: 4113 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 4114 IB_QP_PKEY_INDEX | IB_QP_PORT; 4115 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 4116 if (cm_id_priv->responder_resources) { 4117 struct ib_device *ib_dev = cm_id_priv->id.device; 4118 u64 support_flush = ib_dev->attrs.device_cap_flags & 4119 (IB_DEVICE_FLUSH_GLOBAL | IB_DEVICE_FLUSH_PERSISTENT); 4120 u32 flushable = support_flush ? 4121 (IB_ACCESS_FLUSH_GLOBAL | 4122 IB_ACCESS_FLUSH_PERSISTENT) : 0; 4123 4124 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 4125 IB_ACCESS_REMOTE_ATOMIC | 4126 flushable; 4127 } 4128 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 4129 if (cm_id_priv->av.port) 4130 qp_attr->port_num = cm_id_priv->av.port->port_num; 4131 ret = 0; 4132 break; 4133 default: 4134 trace_icm_qp_init_err(&cm_id_priv->id); 4135 ret = -EINVAL; 4136 break; 4137 } 4138 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4139 return ret; 4140 } 4141 4142 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 4143 struct ib_qp_attr *qp_attr, 4144 int *qp_attr_mask) 4145 { 4146 unsigned long flags; 4147 int ret; 4148 4149 spin_lock_irqsave(&cm_id_priv->lock, flags); 4150 switch (cm_id_priv->id.state) { 4151 case IB_CM_REQ_RCVD: 4152 case IB_CM_MRA_REQ_SENT: 4153 case IB_CM_REP_RCVD: 4154 case IB_CM_MRA_REP_SENT: 4155 case IB_CM_REP_SENT: 4156 case IB_CM_MRA_REP_RCVD: 4157 case IB_CM_ESTABLISHED: 4158 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 4159 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 4160 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 4161 if ((qp_attr->ah_attr.type == RDMA_AH_ATTR_TYPE_IB) && 4162 cm_id_priv->av.dlid_datapath && 4163 (cm_id_priv->av.dlid_datapath != 0xffff)) 4164 qp_attr->ah_attr.ib.dlid = cm_id_priv->av.dlid_datapath; 4165 qp_attr->path_mtu = cm_id_priv->path_mtu; 4166 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 4167 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 4168 if (cm_id_priv->qp_type == IB_QPT_RC || 4169 cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 4170 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 4171 IB_QP_MIN_RNR_TIMER; 4172 qp_attr->max_dest_rd_atomic = 4173 cm_id_priv->responder_resources; 4174 qp_attr->min_rnr_timer = 0; 4175 } 4176 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr) && 4177 cm_id_priv->alt_av.port) { 4178 *qp_attr_mask |= IB_QP_ALT_PATH; 4179 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 4180 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 4181 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 4182 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 4183 } 4184 ret = 0; 4185 break; 4186 default: 4187 trace_icm_qp_rtr_err(&cm_id_priv->id); 4188 ret = -EINVAL; 4189 break; 4190 } 4191 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4192 return ret; 4193 } 4194 4195 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 4196 struct ib_qp_attr *qp_attr, 4197 int *qp_attr_mask) 4198 { 4199 unsigned long flags; 4200 int ret; 4201 4202 spin_lock_irqsave(&cm_id_priv->lock, flags); 4203 switch (cm_id_priv->id.state) { 4204 /* Allow transition to RTS before sending REP */ 4205 case IB_CM_REQ_RCVD: 4206 case IB_CM_MRA_REQ_SENT: 4207 4208 case IB_CM_REP_RCVD: 4209 case IB_CM_MRA_REP_SENT: 4210 case IB_CM_REP_SENT: 4211 case IB_CM_MRA_REP_RCVD: 4212 case IB_CM_ESTABLISHED: 4213 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 4214 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 4215 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 4216 switch (cm_id_priv->qp_type) { 4217 case IB_QPT_RC: 4218 case IB_QPT_XRC_INI: 4219 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY | 4220 IB_QP_MAX_QP_RD_ATOMIC; 4221 qp_attr->retry_cnt = cm_id_priv->retry_count; 4222 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 4223 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 4224 fallthrough; 4225 case IB_QPT_XRC_TGT: 4226 *qp_attr_mask |= IB_QP_TIMEOUT; 4227 qp_attr->timeout = cm_id_priv->av.timeout; 4228 break; 4229 default: 4230 break; 4231 } 4232 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) { 4233 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 4234 qp_attr->path_mig_state = IB_MIG_REARM; 4235 } 4236 } else { 4237 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 4238 if (cm_id_priv->alt_av.port) 4239 qp_attr->alt_port_num = 4240 cm_id_priv->alt_av.port->port_num; 4241 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 4242 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 4243 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 4244 qp_attr->path_mig_state = IB_MIG_REARM; 4245 } 4246 ret = 0; 4247 break; 4248 default: 4249 trace_icm_qp_rts_err(&cm_id_priv->id); 4250 ret = -EINVAL; 4251 break; 4252 } 4253 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4254 return ret; 4255 } 4256 4257 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 4258 struct ib_qp_attr *qp_attr, 4259 int *qp_attr_mask) 4260 { 4261 struct cm_id_private *cm_id_priv; 4262 int ret; 4263 4264 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 4265 switch (qp_attr->qp_state) { 4266 case IB_QPS_INIT: 4267 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 4268 break; 4269 case IB_QPS_RTR: 4270 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 4271 break; 4272 case IB_QPS_RTS: 4273 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 4274 break; 4275 default: 4276 ret = -EINVAL; 4277 break; 4278 } 4279 return ret; 4280 } 4281 EXPORT_SYMBOL(ib_cm_init_qp_attr); 4282 4283 static ssize_t cm_show_counter(struct ib_device *ibdev, u32 port_num, 4284 struct ib_port_attribute *attr, char *buf) 4285 { 4286 struct cm_counter_attribute *cm_attr = 4287 container_of(attr, struct cm_counter_attribute, attr); 4288 struct cm_device *cm_dev = ib_get_client_data(ibdev, &cm_client); 4289 4290 if (WARN_ON(!cm_dev)) 4291 return -EINVAL; 4292 4293 return sysfs_emit( 4294 buf, "%ld\n", 4295 atomic_long_read( 4296 &cm_dev->port[port_num - 1] 4297 ->counters[cm_attr->group][cm_attr->index])); 4298 } 4299 4300 #define CM_COUNTER_ATTR(_name, _group, _index) \ 4301 { \ 4302 .attr = __ATTR(_name, 0444, cm_show_counter, NULL), \ 4303 .group = _group, .index = _index \ 4304 } 4305 4306 #define CM_COUNTER_GROUP(_group, _name) \ 4307 static struct cm_counter_attribute cm_counter_attr_##_group[] = { \ 4308 CM_COUNTER_ATTR(req, _group, CM_REQ_COUNTER), \ 4309 CM_COUNTER_ATTR(mra, _group, CM_MRA_COUNTER), \ 4310 CM_COUNTER_ATTR(rej, _group, CM_REJ_COUNTER), \ 4311 CM_COUNTER_ATTR(rep, _group, CM_REP_COUNTER), \ 4312 CM_COUNTER_ATTR(rtu, _group, CM_RTU_COUNTER), \ 4313 CM_COUNTER_ATTR(dreq, _group, CM_DREQ_COUNTER), \ 4314 CM_COUNTER_ATTR(drep, _group, CM_DREP_COUNTER), \ 4315 CM_COUNTER_ATTR(sidr_req, _group, CM_SIDR_REQ_COUNTER), \ 4316 CM_COUNTER_ATTR(sidr_rep, _group, CM_SIDR_REP_COUNTER), \ 4317 CM_COUNTER_ATTR(lap, _group, CM_LAP_COUNTER), \ 4318 CM_COUNTER_ATTR(apr, _group, CM_APR_COUNTER), \ 4319 }; \ 4320 static struct attribute *cm_counter_attrs_##_group[] = { \ 4321 &cm_counter_attr_##_group[0].attr.attr, \ 4322 &cm_counter_attr_##_group[1].attr.attr, \ 4323 &cm_counter_attr_##_group[2].attr.attr, \ 4324 &cm_counter_attr_##_group[3].attr.attr, \ 4325 &cm_counter_attr_##_group[4].attr.attr, \ 4326 &cm_counter_attr_##_group[5].attr.attr, \ 4327 &cm_counter_attr_##_group[6].attr.attr, \ 4328 &cm_counter_attr_##_group[7].attr.attr, \ 4329 &cm_counter_attr_##_group[8].attr.attr, \ 4330 &cm_counter_attr_##_group[9].attr.attr, \ 4331 &cm_counter_attr_##_group[10].attr.attr, \ 4332 NULL, \ 4333 }; \ 4334 static const struct attribute_group cm_counter_group_##_group = { \ 4335 .name = _name, \ 4336 .attrs = cm_counter_attrs_##_group, \ 4337 }; 4338 4339 CM_COUNTER_GROUP(CM_XMIT, "cm_tx_msgs") 4340 CM_COUNTER_GROUP(CM_XMIT_RETRIES, "cm_tx_retries") 4341 CM_COUNTER_GROUP(CM_RECV, "cm_rx_msgs") 4342 CM_COUNTER_GROUP(CM_RECV_DUPLICATES, "cm_rx_duplicates") 4343 4344 static const struct attribute_group *cm_counter_groups[] = { 4345 &cm_counter_group_CM_XMIT, 4346 &cm_counter_group_CM_XMIT_RETRIES, 4347 &cm_counter_group_CM_RECV, 4348 &cm_counter_group_CM_RECV_DUPLICATES, 4349 NULL, 4350 }; 4351 4352 static int cm_add_one(struct ib_device *ib_device) 4353 { 4354 struct cm_device *cm_dev; 4355 struct cm_port *port; 4356 struct ib_mad_reg_req reg_req = { 4357 .mgmt_class = IB_MGMT_CLASS_CM, 4358 .mgmt_class_version = IB_CM_CLASS_VERSION, 4359 }; 4360 struct ib_port_modify port_modify = { 4361 .set_port_cap_mask = IB_PORT_CM_SUP 4362 }; 4363 unsigned long flags; 4364 int ret; 4365 int count = 0; 4366 u32 i; 4367 4368 cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt), 4369 GFP_KERNEL); 4370 if (!cm_dev) 4371 return -ENOMEM; 4372 4373 kref_init(&cm_dev->kref); 4374 spin_lock_init(&cm_dev->mad_agent_lock); 4375 cm_dev->ib_device = ib_device; 4376 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay; 4377 cm_dev->going_down = 0; 4378 4379 ib_set_client_data(ib_device, &cm_client, cm_dev); 4380 4381 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 4382 rdma_for_each_port (ib_device, i) { 4383 if (!rdma_cap_ib_cm(ib_device, i)) 4384 continue; 4385 4386 port = kzalloc(sizeof *port, GFP_KERNEL); 4387 if (!port) { 4388 ret = -ENOMEM; 4389 goto error1; 4390 } 4391 4392 cm_dev->port[i-1] = port; 4393 port->cm_dev = cm_dev; 4394 port->port_num = i; 4395 4396 ret = ib_port_register_client_groups(ib_device, i, 4397 cm_counter_groups); 4398 if (ret) 4399 goto error1; 4400 4401 port->mad_agent = ib_register_mad_agent(ib_device, i, 4402 IB_QPT_GSI, 4403 ®_req, 4404 0, 4405 cm_send_handler, 4406 cm_recv_handler, 4407 port, 4408 0); 4409 if (IS_ERR(port->mad_agent)) { 4410 ret = PTR_ERR(port->mad_agent); 4411 goto error2; 4412 } 4413 4414 ret = ib_modify_port(ib_device, i, 0, &port_modify); 4415 if (ret) 4416 goto error3; 4417 4418 count++; 4419 } 4420 4421 if (!count) { 4422 ret = -EOPNOTSUPP; 4423 goto free; 4424 } 4425 4426 write_lock_irqsave(&cm.device_lock, flags); 4427 list_add_tail(&cm_dev->list, &cm.device_list); 4428 write_unlock_irqrestore(&cm.device_lock, flags); 4429 return 0; 4430 4431 error3: 4432 ib_unregister_mad_agent(port->mad_agent); 4433 error2: 4434 ib_port_unregister_client_groups(ib_device, i, cm_counter_groups); 4435 error1: 4436 port_modify.set_port_cap_mask = 0; 4437 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 4438 while (--i) { 4439 if (!rdma_cap_ib_cm(ib_device, i)) 4440 continue; 4441 4442 port = cm_dev->port[i-1]; 4443 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4444 ib_unregister_mad_agent(port->mad_agent); 4445 ib_port_unregister_client_groups(ib_device, i, 4446 cm_counter_groups); 4447 } 4448 free: 4449 cm_device_put(cm_dev); 4450 return ret; 4451 } 4452 4453 static void cm_remove_one(struct ib_device *ib_device, void *client_data) 4454 { 4455 struct cm_device *cm_dev = client_data; 4456 struct cm_port *port; 4457 struct ib_port_modify port_modify = { 4458 .clr_port_cap_mask = IB_PORT_CM_SUP 4459 }; 4460 unsigned long flags; 4461 u32 i; 4462 4463 write_lock_irqsave(&cm.device_lock, flags); 4464 list_del(&cm_dev->list); 4465 write_unlock_irqrestore(&cm.device_lock, flags); 4466 4467 spin_lock_irq(&cm.lock); 4468 cm_dev->going_down = 1; 4469 spin_unlock_irq(&cm.lock); 4470 4471 rdma_for_each_port (ib_device, i) { 4472 struct ib_mad_agent *mad_agent; 4473 4474 if (!rdma_cap_ib_cm(ib_device, i)) 4475 continue; 4476 4477 port = cm_dev->port[i-1]; 4478 mad_agent = port->mad_agent; 4479 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4480 /* 4481 * We flush the queue here after the going_down set, this 4482 * verify that no new works will be queued in the recv handler, 4483 * after that we can call the unregister_mad_agent 4484 */ 4485 flush_workqueue(cm.wq); 4486 /* 4487 * The above ensures no call paths from the work are running, 4488 * the remaining paths all take the mad_agent_lock. 4489 */ 4490 spin_lock(&cm_dev->mad_agent_lock); 4491 port->mad_agent = NULL; 4492 spin_unlock(&cm_dev->mad_agent_lock); 4493 ib_unregister_mad_agent(mad_agent); 4494 ib_port_unregister_client_groups(ib_device, i, 4495 cm_counter_groups); 4496 } 4497 4498 cm_device_put(cm_dev); 4499 } 4500 4501 static int __init ib_cm_init(void) 4502 { 4503 int ret; 4504 4505 INIT_LIST_HEAD(&cm.device_list); 4506 rwlock_init(&cm.device_lock); 4507 spin_lock_init(&cm.lock); 4508 cm.listen_service_table = RB_ROOT; 4509 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 4510 cm.remote_id_table = RB_ROOT; 4511 cm.remote_qp_table = RB_ROOT; 4512 cm.remote_sidr_table = RB_ROOT; 4513 xa_init_flags(&cm.local_id_table, XA_FLAGS_ALLOC); 4514 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 4515 INIT_LIST_HEAD(&cm.timewait_list); 4516 4517 cm.wq = alloc_workqueue("ib_cm", 0, 1); 4518 if (!cm.wq) { 4519 ret = -ENOMEM; 4520 goto error2; 4521 } 4522 4523 ret = ib_register_client(&cm_client); 4524 if (ret) 4525 goto error3; 4526 4527 return 0; 4528 error3: 4529 destroy_workqueue(cm.wq); 4530 error2: 4531 return ret; 4532 } 4533 4534 static void __exit ib_cm_cleanup(void) 4535 { 4536 struct cm_timewait_info *timewait_info, *tmp; 4537 4538 spin_lock_irq(&cm.lock); 4539 list_for_each_entry(timewait_info, &cm.timewait_list, list) 4540 cancel_delayed_work(&timewait_info->work.work); 4541 spin_unlock_irq(&cm.lock); 4542 4543 ib_unregister_client(&cm_client); 4544 destroy_workqueue(cm.wq); 4545 4546 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 4547 list_del(&timewait_info->list); 4548 kfree(timewait_info); 4549 } 4550 4551 WARN_ON(!xa_empty(&cm.local_id_table)); 4552 } 4553 4554 module_init(ib_cm_init); 4555 module_exit(ib_cm_cleanup); 4556