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 #define CM_DIRECT_RETRY_CTX ((void *) 1UL) 39 #define CM_MRA_SETTING 24 /* 4.096us * 2^24 = ~68.7 seconds */ 40 41 static const char * const ibcm_rej_reason_strs[] = { 42 [IB_CM_REJ_NO_QP] = "no QP", 43 [IB_CM_REJ_NO_EEC] = "no EEC", 44 [IB_CM_REJ_NO_RESOURCES] = "no resources", 45 [IB_CM_REJ_TIMEOUT] = "timeout", 46 [IB_CM_REJ_UNSUPPORTED] = "unsupported", 47 [IB_CM_REJ_INVALID_COMM_ID] = "invalid comm ID", 48 [IB_CM_REJ_INVALID_COMM_INSTANCE] = "invalid comm instance", 49 [IB_CM_REJ_INVALID_SERVICE_ID] = "invalid service ID", 50 [IB_CM_REJ_INVALID_TRANSPORT_TYPE] = "invalid transport type", 51 [IB_CM_REJ_STALE_CONN] = "stale conn", 52 [IB_CM_REJ_RDC_NOT_EXIST] = "RDC not exist", 53 [IB_CM_REJ_INVALID_GID] = "invalid GID", 54 [IB_CM_REJ_INVALID_LID] = "invalid LID", 55 [IB_CM_REJ_INVALID_SL] = "invalid SL", 56 [IB_CM_REJ_INVALID_TRAFFIC_CLASS] = "invalid traffic class", 57 [IB_CM_REJ_INVALID_HOP_LIMIT] = "invalid hop limit", 58 [IB_CM_REJ_INVALID_PACKET_RATE] = "invalid packet rate", 59 [IB_CM_REJ_INVALID_ALT_GID] = "invalid alt GID", 60 [IB_CM_REJ_INVALID_ALT_LID] = "invalid alt LID", 61 [IB_CM_REJ_INVALID_ALT_SL] = "invalid alt SL", 62 [IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS] = "invalid alt traffic class", 63 [IB_CM_REJ_INVALID_ALT_HOP_LIMIT] = "invalid alt hop limit", 64 [IB_CM_REJ_INVALID_ALT_PACKET_RATE] = "invalid alt packet rate", 65 [IB_CM_REJ_PORT_CM_REDIRECT] = "port CM redirect", 66 [IB_CM_REJ_PORT_REDIRECT] = "port redirect", 67 [IB_CM_REJ_INVALID_MTU] = "invalid MTU", 68 [IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES] = "insufficient resp resources", 69 [IB_CM_REJ_CONSUMER_DEFINED] = "consumer defined", 70 [IB_CM_REJ_INVALID_RNR_RETRY] = "invalid RNR retry", 71 [IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID] = "duplicate local comm ID", 72 [IB_CM_REJ_INVALID_CLASS_VERSION] = "invalid class version", 73 [IB_CM_REJ_INVALID_FLOW_LABEL] = "invalid flow label", 74 [IB_CM_REJ_INVALID_ALT_FLOW_LABEL] = "invalid alt flow label", 75 [IB_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED] = 76 "vendor option is not supported", 77 }; 78 79 const char *__attribute_const__ ibcm_reject_msg(int reason) 80 { 81 size_t index = reason; 82 83 if (index < ARRAY_SIZE(ibcm_rej_reason_strs) && 84 ibcm_rej_reason_strs[index]) 85 return ibcm_rej_reason_strs[index]; 86 else 87 return "unrecognized reason"; 88 } 89 EXPORT_SYMBOL(ibcm_reject_msg); 90 91 struct cm_id_private; 92 struct cm_work; 93 static int cm_add_one(struct ib_device *device); 94 static void cm_remove_one(struct ib_device *device, void *client_data); 95 static void cm_process_work(struct cm_id_private *cm_id_priv, 96 struct cm_work *work); 97 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv, 98 struct ib_cm_sidr_rep_param *param); 99 static void cm_issue_dreq(struct cm_id_private *cm_id_priv); 100 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv, 101 void *private_data, u8 private_data_len); 102 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv, 103 enum ib_cm_rej_reason reason, void *ari, 104 u8 ari_length, const void *private_data, 105 u8 private_data_len); 106 107 static struct ib_client cm_client = { 108 .name = "cm", 109 .add = cm_add_one, 110 .remove = cm_remove_one 111 }; 112 113 static struct ib_cm { 114 spinlock_t lock; 115 struct list_head device_list; 116 rwlock_t device_lock; 117 struct rb_root listen_service_table; 118 u64 listen_service_id; 119 /* struct rb_root peer_service_table; todo: fix peer to peer */ 120 struct rb_root remote_qp_table; 121 struct rb_root remote_id_table; 122 struct rb_root remote_sidr_table; 123 struct xarray local_id_table; 124 u32 local_id_next; 125 __be32 random_id_operand; 126 struct list_head timewait_list; 127 struct workqueue_struct *wq; 128 } cm; 129 130 /* Counter indexes ordered by attribute ID */ 131 enum { 132 CM_REQ_COUNTER, 133 CM_MRA_COUNTER, 134 CM_REJ_COUNTER, 135 CM_REP_COUNTER, 136 CM_RTU_COUNTER, 137 CM_DREQ_COUNTER, 138 CM_DREP_COUNTER, 139 CM_SIDR_REQ_COUNTER, 140 CM_SIDR_REP_COUNTER, 141 CM_LAP_COUNTER, 142 CM_APR_COUNTER, 143 CM_ATTR_COUNT, 144 CM_ATTR_ID_OFFSET = 0x0010, 145 }; 146 147 enum { 148 CM_XMIT, 149 CM_XMIT_RETRIES, 150 CM_RECV, 151 CM_RECV_DUPLICATES, 152 CM_COUNTER_GROUPS 153 }; 154 155 struct cm_counter_attribute { 156 struct ib_port_attribute attr; 157 unsigned short group; 158 unsigned short index; 159 }; 160 161 struct cm_port { 162 struct cm_device *cm_dev; 163 struct ib_mad_agent *mad_agent; 164 u32 port_num; 165 atomic_long_t counters[CM_COUNTER_GROUPS][CM_ATTR_COUNT]; 166 }; 167 168 struct cm_device { 169 struct kref kref; 170 struct list_head list; 171 rwlock_t mad_agent_lock; 172 struct ib_device *ib_device; 173 u8 ack_delay; 174 int going_down; 175 struct cm_port *port[]; 176 }; 177 178 struct cm_av { 179 struct cm_port *port; 180 struct rdma_ah_attr ah_attr; 181 u16 dlid_datapath; 182 u16 pkey_index; 183 u8 timeout; 184 }; 185 186 struct cm_work { 187 struct delayed_work work; 188 struct list_head list; 189 struct cm_port *port; 190 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 191 __be32 local_id; /* Established / timewait */ 192 __be32 remote_id; 193 struct ib_cm_event cm_event; 194 struct sa_path_rec path[]; 195 }; 196 197 struct cm_timewait_info { 198 struct cm_work work; 199 struct list_head list; 200 struct rb_node remote_qp_node; 201 struct rb_node remote_id_node; 202 __be64 remote_ca_guid; 203 __be32 remote_qpn; 204 u8 inserted_remote_qp; 205 u8 inserted_remote_id; 206 }; 207 208 struct cm_id_private { 209 struct ib_cm_id id; 210 211 struct rb_node service_node; 212 struct rb_node sidr_id_node; 213 u32 sidr_slid; 214 spinlock_t lock; /* Do not acquire inside cm.lock */ 215 struct completion comp; 216 refcount_t refcount; 217 /* Number of clients sharing this ib_cm_id. Only valid for listeners. 218 * Protected by the cm.lock spinlock. 219 */ 220 int listen_sharecount; 221 struct rcu_head rcu; 222 223 struct ib_mad_send_buf *msg; 224 struct cm_timewait_info *timewait_info; 225 /* todo: use alternate port on send failure */ 226 struct cm_av av; 227 struct cm_av alt_av; 228 229 void *private_data; 230 __be64 tid; 231 __be32 local_qpn; 232 __be32 remote_qpn; 233 enum ib_qp_type qp_type; 234 __be32 sq_psn; 235 __be32 rq_psn; 236 int timeout_ms; 237 enum ib_mtu path_mtu; 238 __be16 pkey; 239 u8 private_data_len; 240 u8 max_cm_retries; 241 u8 responder_resources; 242 u8 initiator_depth; 243 u8 retry_count; 244 u8 rnr_retry_count; 245 u8 target_ack_delay; 246 247 struct list_head work_list; 248 atomic_t work_count; 249 250 struct rdma_ucm_ece ece; 251 }; 252 253 static void cm_dev_release(struct kref *kref) 254 { 255 struct cm_device *cm_dev = container_of(kref, struct cm_device, kref); 256 u32 i; 257 258 rdma_for_each_port(cm_dev->ib_device, i) 259 kfree(cm_dev->port[i - 1]); 260 261 kfree(cm_dev); 262 } 263 264 static void cm_device_put(struct cm_device *cm_dev) 265 { 266 kref_put(&cm_dev->kref, cm_dev_release); 267 } 268 269 static void cm_work_handler(struct work_struct *work); 270 271 static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 272 { 273 if (refcount_dec_and_test(&cm_id_priv->refcount)) 274 complete(&cm_id_priv->comp); 275 } 276 277 static struct ib_mad_send_buf *cm_alloc_msg(struct cm_id_private *cm_id_priv) 278 { 279 struct ib_mad_agent *mad_agent; 280 struct ib_mad_send_buf *m; 281 struct ib_ah *ah; 282 283 lockdep_assert_held(&cm_id_priv->lock); 284 285 if (!cm_id_priv->av.port) 286 return ERR_PTR(-EINVAL); 287 288 read_lock(&cm_id_priv->av.port->cm_dev->mad_agent_lock); 289 mad_agent = cm_id_priv->av.port->mad_agent; 290 if (!mad_agent) { 291 m = ERR_PTR(-EINVAL); 292 goto out; 293 } 294 295 ah = rdma_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr, 0); 296 if (IS_ERR(ah)) { 297 m = ERR_CAST(ah); 298 goto out; 299 } 300 301 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 302 cm_id_priv->av.pkey_index, 303 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 304 GFP_ATOMIC, 305 IB_MGMT_BASE_VERSION); 306 if (IS_ERR(m)) { 307 rdma_destroy_ah(ah, 0); 308 goto out; 309 } 310 311 m->ah = ah; 312 313 out: 314 read_unlock(&cm_id_priv->av.port->cm_dev->mad_agent_lock); 315 return m; 316 } 317 318 static void cm_free_msg(struct ib_mad_send_buf *msg) 319 { 320 if (msg->ah) 321 rdma_destroy_ah(msg->ah, 0); 322 ib_free_send_mad(msg); 323 } 324 325 static struct ib_mad_send_buf * 326 cm_alloc_priv_msg(struct cm_id_private *cm_id_priv, enum ib_cm_state state) 327 { 328 struct ib_mad_send_buf *msg; 329 330 lockdep_assert_held(&cm_id_priv->lock); 331 332 msg = cm_alloc_msg(cm_id_priv); 333 if (IS_ERR(msg)) 334 return msg; 335 336 cm_id_priv->msg = msg; 337 refcount_inc(&cm_id_priv->refcount); 338 msg->context[0] = cm_id_priv; 339 msg->context[1] = (void *) (unsigned long) state; 340 341 msg->retries = cm_id_priv->max_cm_retries; 342 msg->timeout_ms = cm_id_priv->timeout_ms; 343 344 return msg; 345 } 346 347 static void cm_free_priv_msg(struct ib_mad_send_buf *msg) 348 { 349 struct cm_id_private *cm_id_priv = msg->context[0]; 350 351 lockdep_assert_held(&cm_id_priv->lock); 352 353 if (!WARN_ON(cm_id_priv->msg != msg)) 354 cm_id_priv->msg = NULL; 355 356 if (msg->ah) 357 rdma_destroy_ah(msg->ah, 0); 358 cm_deref_id(cm_id_priv); 359 ib_free_send_mad(msg); 360 } 361 362 static struct ib_mad_send_buf * 363 cm_alloc_response_msg_no_ah(struct cm_port *port, 364 struct ib_mad_recv_wc *mad_recv_wc, 365 bool direct_retry) 366 { 367 struct ib_mad_send_buf *m; 368 369 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 370 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 371 GFP_ATOMIC, IB_MGMT_BASE_VERSION); 372 if (!IS_ERR(m)) 373 m->context[0] = direct_retry ? CM_DIRECT_RETRY_CTX : NULL; 374 375 return m; 376 } 377 378 static int cm_create_response_msg_ah(struct cm_port *port, 379 struct ib_mad_recv_wc *mad_recv_wc, 380 struct ib_mad_send_buf *msg) 381 { 382 struct ib_ah *ah; 383 384 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 385 mad_recv_wc->recv_buf.grh, port->port_num); 386 if (IS_ERR(ah)) 387 return PTR_ERR(ah); 388 389 msg->ah = ah; 390 return 0; 391 } 392 393 static int cm_alloc_response_msg(struct cm_port *port, 394 struct ib_mad_recv_wc *mad_recv_wc, 395 bool direct_retry, 396 struct ib_mad_send_buf **msg) 397 { 398 struct ib_mad_send_buf *m; 399 int ret; 400 401 m = cm_alloc_response_msg_no_ah(port, mad_recv_wc, direct_retry); 402 if (IS_ERR(m)) 403 return PTR_ERR(m); 404 405 ret = cm_create_response_msg_ah(port, mad_recv_wc, m); 406 if (ret) { 407 ib_free_send_mad(m); 408 return ret; 409 } 410 411 *msg = m; 412 return 0; 413 } 414 415 static void *cm_copy_private_data(const void *private_data, u8 private_data_len) 416 { 417 void *data; 418 419 if (!private_data || !private_data_len) 420 return NULL; 421 422 data = kmemdup(private_data, private_data_len, GFP_KERNEL); 423 if (!data) 424 return ERR_PTR(-ENOMEM); 425 426 return data; 427 } 428 429 static void cm_set_private_data(struct cm_id_private *cm_id_priv, 430 void *private_data, u8 private_data_len) 431 { 432 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 433 kfree(cm_id_priv->private_data); 434 435 cm_id_priv->private_data = private_data; 436 cm_id_priv->private_data_len = private_data_len; 437 } 438 439 static void cm_set_av_port(struct cm_av *av, struct cm_port *port) 440 { 441 struct cm_port *old_port = av->port; 442 443 if (old_port == port) 444 return; 445 446 av->port = port; 447 if (old_port) 448 cm_device_put(old_port->cm_dev); 449 if (port) 450 kref_get(&port->cm_dev->kref); 451 } 452 453 static void cm_init_av_for_lap(struct cm_port *port, struct ib_wc *wc, 454 struct rdma_ah_attr *ah_attr, struct cm_av *av) 455 { 456 cm_set_av_port(av, port); 457 av->pkey_index = wc->pkey_index; 458 rdma_move_ah_attr(&av->ah_attr, ah_attr); 459 } 460 461 static int cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 462 struct ib_grh *grh, struct cm_av *av) 463 { 464 cm_set_av_port(av, port); 465 av->pkey_index = wc->pkey_index; 466 return ib_init_ah_attr_from_wc(port->cm_dev->ib_device, 467 port->port_num, wc, 468 grh, &av->ah_attr); 469 } 470 471 static struct cm_port * 472 get_cm_port_from_path(struct sa_path_rec *path, const struct ib_gid_attr *attr) 473 { 474 struct cm_device *cm_dev; 475 struct cm_port *port = NULL; 476 unsigned long flags; 477 478 if (attr) { 479 read_lock_irqsave(&cm.device_lock, flags); 480 list_for_each_entry(cm_dev, &cm.device_list, list) { 481 if (cm_dev->ib_device == attr->device) { 482 port = cm_dev->port[attr->port_num - 1]; 483 break; 484 } 485 } 486 read_unlock_irqrestore(&cm.device_lock, flags); 487 } else { 488 /* SGID attribute can be NULL in following 489 * conditions. 490 * (a) Alternative path 491 * (b) IB link layer without GRH 492 * (c) LAP send messages 493 */ 494 read_lock_irqsave(&cm.device_lock, flags); 495 list_for_each_entry(cm_dev, &cm.device_list, list) { 496 attr = rdma_find_gid(cm_dev->ib_device, 497 &path->sgid, 498 sa_conv_pathrec_to_gid_type(path), 499 NULL); 500 if (!IS_ERR(attr)) { 501 port = cm_dev->port[attr->port_num - 1]; 502 break; 503 } 504 } 505 read_unlock_irqrestore(&cm.device_lock, flags); 506 if (port) 507 rdma_put_gid_attr(attr); 508 } 509 return port; 510 } 511 512 static int cm_init_av_by_path(struct sa_path_rec *path, 513 const struct ib_gid_attr *sgid_attr, 514 struct cm_av *av) 515 { 516 struct rdma_ah_attr new_ah_attr; 517 struct cm_device *cm_dev; 518 struct cm_port *port; 519 int ret; 520 521 port = get_cm_port_from_path(path, sgid_attr); 522 if (!port) 523 return -EINVAL; 524 cm_dev = port->cm_dev; 525 526 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num, 527 be16_to_cpu(path->pkey), &av->pkey_index); 528 if (ret) 529 return ret; 530 531 cm_set_av_port(av, port); 532 533 /* 534 * av->ah_attr might be initialized based on wc or during 535 * request processing time which might have reference to sgid_attr. 536 * So initialize a new ah_attr on stack. 537 * If initialization fails, old ah_attr is used for sending any 538 * responses. If initialization is successful, than new ah_attr 539 * is used by overwriting the old one. So that right ah_attr 540 * can be used to return an error response. 541 */ 542 ret = ib_init_ah_attr_from_path(cm_dev->ib_device, port->port_num, path, 543 &new_ah_attr, sgid_attr); 544 if (ret) 545 return ret; 546 547 av->timeout = path->packet_life_time + 1; 548 rdma_move_ah_attr(&av->ah_attr, &new_ah_attr); 549 return 0; 550 } 551 552 /* Move av created by cm_init_av_by_path(), so av.dgid is not moved */ 553 static void cm_move_av_from_path(struct cm_av *dest, struct cm_av *src) 554 { 555 cm_set_av_port(dest, src->port); 556 cm_set_av_port(src, NULL); 557 dest->pkey_index = src->pkey_index; 558 rdma_move_ah_attr(&dest->ah_attr, &src->ah_attr); 559 dest->timeout = src->timeout; 560 } 561 562 static void cm_destroy_av(struct cm_av *av) 563 { 564 rdma_destroy_ah_attr(&av->ah_attr); 565 cm_set_av_port(av, NULL); 566 } 567 568 static u32 cm_local_id(__be32 local_id) 569 { 570 return (__force u32) (local_id ^ cm.random_id_operand); 571 } 572 573 static struct cm_id_private *cm_acquire_id(__be32 local_id, __be32 remote_id) 574 { 575 struct cm_id_private *cm_id_priv; 576 577 rcu_read_lock(); 578 cm_id_priv = xa_load(&cm.local_id_table, cm_local_id(local_id)); 579 if (!cm_id_priv || cm_id_priv->id.remote_id != remote_id || 580 !refcount_inc_not_zero(&cm_id_priv->refcount)) 581 cm_id_priv = NULL; 582 rcu_read_unlock(); 583 584 return cm_id_priv; 585 } 586 587 /* 588 * Trivial helpers to strip endian annotation and compare; the 589 * endianness doesn't actually matter since we just need a stable 590 * order for the RB tree. 591 */ 592 static int be32_lt(__be32 a, __be32 b) 593 { 594 return (__force u32) a < (__force u32) b; 595 } 596 597 static int be32_gt(__be32 a, __be32 b) 598 { 599 return (__force u32) a > (__force u32) b; 600 } 601 602 static int be64_lt(__be64 a, __be64 b) 603 { 604 return (__force u64) a < (__force u64) b; 605 } 606 607 static int be64_gt(__be64 a, __be64 b) 608 { 609 return (__force u64) a > (__force u64) b; 610 } 611 612 /* 613 * Inserts a new cm_id_priv into the listen_service_table. Returns cm_id_priv 614 * if the new ID was inserted, NULL if it could not be inserted due to a 615 * collision, or the existing cm_id_priv ready for shared usage. 616 */ 617 static struct cm_id_private *cm_insert_listen(struct cm_id_private *cm_id_priv, 618 ib_cm_handler shared_handler) 619 { 620 struct rb_node **link = &cm.listen_service_table.rb_node; 621 struct rb_node *parent = NULL; 622 struct cm_id_private *cur_cm_id_priv; 623 __be64 service_id = cm_id_priv->id.service_id; 624 unsigned long flags; 625 626 spin_lock_irqsave(&cm.lock, flags); 627 while (*link) { 628 parent = *link; 629 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 630 service_node); 631 632 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 633 link = &(*link)->rb_left; 634 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 635 link = &(*link)->rb_right; 636 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id)) 637 link = &(*link)->rb_left; 638 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id)) 639 link = &(*link)->rb_right; 640 else { 641 /* 642 * Sharing an ib_cm_id with different handlers is not 643 * supported 644 */ 645 if (cur_cm_id_priv->id.cm_handler != shared_handler || 646 cur_cm_id_priv->id.context || 647 WARN_ON(!cur_cm_id_priv->id.cm_handler)) { 648 spin_unlock_irqrestore(&cm.lock, flags); 649 return NULL; 650 } 651 refcount_inc(&cur_cm_id_priv->refcount); 652 cur_cm_id_priv->listen_sharecount++; 653 spin_unlock_irqrestore(&cm.lock, flags); 654 return cur_cm_id_priv; 655 } 656 } 657 cm_id_priv->listen_sharecount++; 658 rb_link_node(&cm_id_priv->service_node, parent, link); 659 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 660 spin_unlock_irqrestore(&cm.lock, flags); 661 return cm_id_priv; 662 } 663 664 static struct cm_id_private *cm_find_listen(struct ib_device *device, 665 __be64 service_id) 666 { 667 struct rb_node *node = cm.listen_service_table.rb_node; 668 struct cm_id_private *cm_id_priv; 669 670 while (node) { 671 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 672 673 if (device < cm_id_priv->id.device) 674 node = node->rb_left; 675 else if (device > cm_id_priv->id.device) 676 node = node->rb_right; 677 else if (be64_lt(service_id, cm_id_priv->id.service_id)) 678 node = node->rb_left; 679 else if (be64_gt(service_id, cm_id_priv->id.service_id)) 680 node = node->rb_right; 681 else { 682 refcount_inc(&cm_id_priv->refcount); 683 return cm_id_priv; 684 } 685 } 686 return NULL; 687 } 688 689 static struct cm_timewait_info * 690 cm_insert_remote_id(struct cm_timewait_info *timewait_info) 691 { 692 struct rb_node **link = &cm.remote_id_table.rb_node; 693 struct rb_node *parent = NULL; 694 struct cm_timewait_info *cur_timewait_info; 695 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 696 __be32 remote_id = timewait_info->work.remote_id; 697 698 while (*link) { 699 parent = *link; 700 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 701 remote_id_node); 702 if (be32_lt(remote_id, cur_timewait_info->work.remote_id)) 703 link = &(*link)->rb_left; 704 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id)) 705 link = &(*link)->rb_right; 706 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 707 link = &(*link)->rb_left; 708 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 709 link = &(*link)->rb_right; 710 else 711 return cur_timewait_info; 712 } 713 timewait_info->inserted_remote_id = 1; 714 rb_link_node(&timewait_info->remote_id_node, parent, link); 715 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 716 return NULL; 717 } 718 719 static struct cm_id_private *cm_find_remote_id(__be64 remote_ca_guid, 720 __be32 remote_id) 721 { 722 struct rb_node *node = cm.remote_id_table.rb_node; 723 struct cm_timewait_info *timewait_info; 724 struct cm_id_private *res = NULL; 725 726 spin_lock_irq(&cm.lock); 727 while (node) { 728 timewait_info = rb_entry(node, struct cm_timewait_info, 729 remote_id_node); 730 if (be32_lt(remote_id, timewait_info->work.remote_id)) 731 node = node->rb_left; 732 else if (be32_gt(remote_id, timewait_info->work.remote_id)) 733 node = node->rb_right; 734 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid)) 735 node = node->rb_left; 736 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid)) 737 node = node->rb_right; 738 else { 739 res = cm_acquire_id(timewait_info->work.local_id, 740 timewait_info->work.remote_id); 741 break; 742 } 743 } 744 spin_unlock_irq(&cm.lock); 745 return res; 746 } 747 748 static struct cm_timewait_info * 749 cm_insert_remote_qpn(struct cm_timewait_info *timewait_info) 750 { 751 struct rb_node **link = &cm.remote_qp_table.rb_node; 752 struct rb_node *parent = NULL; 753 struct cm_timewait_info *cur_timewait_info; 754 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 755 __be32 remote_qpn = timewait_info->remote_qpn; 756 757 while (*link) { 758 parent = *link; 759 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 760 remote_qp_node); 761 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn)) 762 link = &(*link)->rb_left; 763 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn)) 764 link = &(*link)->rb_right; 765 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 766 link = &(*link)->rb_left; 767 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 768 link = &(*link)->rb_right; 769 else 770 return cur_timewait_info; 771 } 772 timewait_info->inserted_remote_qp = 1; 773 rb_link_node(&timewait_info->remote_qp_node, parent, link); 774 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 775 return NULL; 776 } 777 778 static struct cm_id_private * 779 cm_insert_remote_sidr(struct cm_id_private *cm_id_priv) 780 { 781 struct rb_node **link = &cm.remote_sidr_table.rb_node; 782 struct rb_node *parent = NULL; 783 struct cm_id_private *cur_cm_id_priv; 784 __be32 remote_id = cm_id_priv->id.remote_id; 785 786 while (*link) { 787 parent = *link; 788 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 789 sidr_id_node); 790 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id)) 791 link = &(*link)->rb_left; 792 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id)) 793 link = &(*link)->rb_right; 794 else { 795 if (cur_cm_id_priv->sidr_slid < cm_id_priv->sidr_slid) 796 link = &(*link)->rb_left; 797 else if (cur_cm_id_priv->sidr_slid > cm_id_priv->sidr_slid) 798 link = &(*link)->rb_right; 799 else 800 return cur_cm_id_priv; 801 } 802 } 803 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 804 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 805 return NULL; 806 } 807 808 static struct cm_id_private *cm_alloc_id_priv(struct ib_device *device, 809 ib_cm_handler cm_handler, 810 void *context) 811 { 812 struct cm_id_private *cm_id_priv; 813 u32 id; 814 int ret; 815 816 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 817 if (!cm_id_priv) 818 return ERR_PTR(-ENOMEM); 819 820 cm_id_priv->id.state = IB_CM_IDLE; 821 cm_id_priv->id.device = device; 822 cm_id_priv->id.cm_handler = cm_handler; 823 cm_id_priv->id.context = context; 824 cm_id_priv->id.remote_cm_qpn = 1; 825 826 RB_CLEAR_NODE(&cm_id_priv->service_node); 827 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); 828 spin_lock_init(&cm_id_priv->lock); 829 init_completion(&cm_id_priv->comp); 830 INIT_LIST_HEAD(&cm_id_priv->work_list); 831 atomic_set(&cm_id_priv->work_count, -1); 832 refcount_set(&cm_id_priv->refcount, 1); 833 834 ret = xa_alloc_cyclic(&cm.local_id_table, &id, NULL, xa_limit_32b, 835 &cm.local_id_next, GFP_KERNEL); 836 if (ret < 0) 837 goto error; 838 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand; 839 840 return cm_id_priv; 841 842 error: 843 kfree(cm_id_priv); 844 return ERR_PTR(ret); 845 } 846 847 /* 848 * Make the ID visible to the MAD handlers and other threads that use the 849 * xarray. 850 */ 851 static void cm_finalize_id(struct cm_id_private *cm_id_priv) 852 { 853 xa_store(&cm.local_id_table, cm_local_id(cm_id_priv->id.local_id), 854 cm_id_priv, GFP_ATOMIC); 855 } 856 857 struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 858 ib_cm_handler cm_handler, 859 void *context) 860 { 861 struct cm_id_private *cm_id_priv; 862 863 cm_id_priv = cm_alloc_id_priv(device, cm_handler, context); 864 if (IS_ERR(cm_id_priv)) 865 return ERR_CAST(cm_id_priv); 866 867 cm_finalize_id(cm_id_priv); 868 return &cm_id_priv->id; 869 } 870 EXPORT_SYMBOL(ib_create_cm_id); 871 872 static struct cm_work *cm_dequeue_work(struct cm_id_private *cm_id_priv) 873 { 874 struct cm_work *work; 875 876 if (list_empty(&cm_id_priv->work_list)) 877 return NULL; 878 879 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 880 list_del(&work->list); 881 return work; 882 } 883 884 static void cm_free_work(struct cm_work *work) 885 { 886 if (work->mad_recv_wc) 887 ib_free_recv_mad(work->mad_recv_wc); 888 kfree(work); 889 } 890 891 static void cm_queue_work_unlock(struct cm_id_private *cm_id_priv, 892 struct cm_work *work) 893 __releases(&cm_id_priv->lock) 894 { 895 bool immediate; 896 897 /* 898 * To deliver the event to the user callback we have the drop the 899 * spinlock, however, we need to ensure that the user callback is single 900 * threaded and receives events in the temporal order. If there are 901 * already events being processed then thread new events onto a list, 902 * the thread currently processing will pick them up. 903 */ 904 immediate = atomic_inc_and_test(&cm_id_priv->work_count); 905 if (!immediate) { 906 list_add_tail(&work->list, &cm_id_priv->work_list); 907 /* 908 * This routine always consumes incoming reference. Once queued 909 * to the work_list then a reference is held by the thread 910 * currently running cm_process_work() and this reference is not 911 * needed. 912 */ 913 cm_deref_id(cm_id_priv); 914 } 915 spin_unlock_irq(&cm_id_priv->lock); 916 917 if (immediate) 918 cm_process_work(cm_id_priv, work); 919 } 920 921 static inline int cm_convert_to_ms(int iba_time) 922 { 923 /* approximate conversion to ms from 4.096us x 2^iba_time */ 924 return 1 << max(iba_time - 8, 0); 925 } 926 927 /* 928 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 929 * Because of how ack_timeout is stored, adding one doubles the timeout. 930 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 931 * increment it (round up) only if the other is within 50%. 932 */ 933 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 934 { 935 int ack_timeout = packet_life_time + 1; 936 937 if (ack_timeout >= ca_ack_delay) 938 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 939 else 940 ack_timeout = ca_ack_delay + 941 (ack_timeout >= (ca_ack_delay - 1)); 942 943 return min(31, ack_timeout); 944 } 945 946 static void cm_remove_remote(struct cm_id_private *cm_id_priv) 947 { 948 struct cm_timewait_info *timewait_info = cm_id_priv->timewait_info; 949 950 if (timewait_info->inserted_remote_id) { 951 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 952 timewait_info->inserted_remote_id = 0; 953 } 954 955 if (timewait_info->inserted_remote_qp) { 956 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 957 timewait_info->inserted_remote_qp = 0; 958 } 959 } 960 961 static struct cm_timewait_info *cm_create_timewait_info(__be32 local_id) 962 { 963 struct cm_timewait_info *timewait_info; 964 965 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 966 if (!timewait_info) 967 return ERR_PTR(-ENOMEM); 968 969 timewait_info->work.local_id = local_id; 970 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 971 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 972 return timewait_info; 973 } 974 975 static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 976 { 977 int wait_time; 978 unsigned long flags; 979 struct cm_device *cm_dev; 980 981 lockdep_assert_held(&cm_id_priv->lock); 982 983 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client); 984 if (!cm_dev) 985 return; 986 987 spin_lock_irqsave(&cm.lock, flags); 988 cm_remove_remote(cm_id_priv); 989 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 990 spin_unlock_irqrestore(&cm.lock, flags); 991 992 /* 993 * The cm_id could be destroyed by the user before we exit timewait. 994 * To protect against this, we search for the cm_id after exiting 995 * timewait before notifying the user that we've exited timewait. 996 */ 997 cm_id_priv->id.state = IB_CM_TIMEWAIT; 998 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 999 1000 /* Check if the device started its remove_one */ 1001 spin_lock_irqsave(&cm.lock, flags); 1002 if (!cm_dev->going_down) 1003 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 1004 msecs_to_jiffies(wait_time)); 1005 spin_unlock_irqrestore(&cm.lock, flags); 1006 1007 /* 1008 * The timewait_info is converted into a work and gets freed during 1009 * cm_free_work() in cm_timewait_handler(). 1010 */ 1011 BUILD_BUG_ON(offsetof(struct cm_timewait_info, work) != 0); 1012 cm_id_priv->timewait_info = NULL; 1013 } 1014 1015 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 1016 { 1017 unsigned long flags; 1018 1019 lockdep_assert_held(&cm_id_priv->lock); 1020 1021 cm_id_priv->id.state = IB_CM_IDLE; 1022 if (cm_id_priv->timewait_info) { 1023 spin_lock_irqsave(&cm.lock, flags); 1024 cm_remove_remote(cm_id_priv); 1025 spin_unlock_irqrestore(&cm.lock, flags); 1026 kfree(cm_id_priv->timewait_info); 1027 cm_id_priv->timewait_info = NULL; 1028 } 1029 } 1030 1031 static noinline void cm_destroy_id_wait_timeout(struct ib_cm_id *cm_id, 1032 enum ib_cm_state old_state) 1033 { 1034 struct cm_id_private *cm_id_priv; 1035 1036 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1037 pr_err("%s: cm_id=%p timed out. state %d -> %d, refcnt=%d\n", __func__, 1038 cm_id, old_state, cm_id->state, refcount_read(&cm_id_priv->refcount)); 1039 } 1040 1041 static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 1042 { 1043 struct cm_id_private *cm_id_priv; 1044 enum ib_cm_state old_state; 1045 struct cm_work *work; 1046 int ret; 1047 1048 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1049 spin_lock_irq(&cm_id_priv->lock); 1050 old_state = cm_id->state; 1051 retest: 1052 switch (cm_id->state) { 1053 case IB_CM_LISTEN: 1054 spin_lock(&cm.lock); 1055 if (--cm_id_priv->listen_sharecount > 0) { 1056 /* The id is still shared. */ 1057 WARN_ON(refcount_read(&cm_id_priv->refcount) == 1); 1058 spin_unlock(&cm.lock); 1059 spin_unlock_irq(&cm_id_priv->lock); 1060 cm_deref_id(cm_id_priv); 1061 return; 1062 } 1063 cm_id->state = IB_CM_IDLE; 1064 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 1065 RB_CLEAR_NODE(&cm_id_priv->service_node); 1066 spin_unlock(&cm.lock); 1067 break; 1068 case IB_CM_SIDR_REQ_SENT: 1069 cm_id->state = IB_CM_IDLE; 1070 ib_cancel_mad(cm_id_priv->msg); 1071 break; 1072 case IB_CM_SIDR_REQ_RCVD: 1073 cm_send_sidr_rep_locked(cm_id_priv, 1074 &(struct ib_cm_sidr_rep_param){ 1075 .status = IB_SIDR_REJECT }); 1076 /* cm_send_sidr_rep_locked will not move to IDLE if it fails */ 1077 cm_id->state = IB_CM_IDLE; 1078 break; 1079 case IB_CM_REQ_SENT: 1080 case IB_CM_MRA_REQ_RCVD: 1081 ib_cancel_mad(cm_id_priv->msg); 1082 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_TIMEOUT, 1083 &cm_id_priv->id.device->node_guid, 1084 sizeof(cm_id_priv->id.device->node_guid), 1085 NULL, 0); 1086 break; 1087 case IB_CM_REQ_RCVD: 1088 if (err == -ENOMEM) { 1089 /* Do not reject to allow future retries. */ 1090 cm_reset_to_idle(cm_id_priv); 1091 } else { 1092 cm_send_rej_locked(cm_id_priv, 1093 IB_CM_REJ_CONSUMER_DEFINED, NULL, 0, 1094 NULL, 0); 1095 } 1096 break; 1097 case IB_CM_REP_SENT: 1098 case IB_CM_MRA_REP_RCVD: 1099 ib_cancel_mad(cm_id_priv->msg); 1100 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL, 1101 0, NULL, 0); 1102 goto retest; 1103 case IB_CM_MRA_REQ_SENT: 1104 case IB_CM_REP_RCVD: 1105 case IB_CM_MRA_REP_SENT: 1106 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL, 1107 0, NULL, 0); 1108 break; 1109 case IB_CM_ESTABLISHED: 1110 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 1111 cm_id->state = IB_CM_IDLE; 1112 break; 1113 } 1114 cm_issue_dreq(cm_id_priv); 1115 cm_enter_timewait(cm_id_priv); 1116 goto retest; 1117 case IB_CM_DREQ_SENT: 1118 ib_cancel_mad(cm_id_priv->msg); 1119 cm_enter_timewait(cm_id_priv); 1120 goto retest; 1121 case IB_CM_DREQ_RCVD: 1122 cm_send_drep_locked(cm_id_priv, NULL, 0); 1123 WARN_ON(cm_id->state != IB_CM_TIMEWAIT); 1124 goto retest; 1125 case IB_CM_TIMEWAIT: 1126 /* 1127 * The cm_acquire_id in cm_timewait_handler will stop working 1128 * once we do xa_erase below, so just move to idle here for 1129 * consistency. 1130 */ 1131 cm_id->state = IB_CM_IDLE; 1132 break; 1133 case IB_CM_IDLE: 1134 break; 1135 } 1136 WARN_ON(cm_id->state != IB_CM_IDLE); 1137 1138 spin_lock(&cm.lock); 1139 /* Required for cleanup paths related cm_req_handler() */ 1140 if (cm_id_priv->timewait_info) { 1141 cm_remove_remote(cm_id_priv); 1142 kfree(cm_id_priv->timewait_info); 1143 cm_id_priv->timewait_info = NULL; 1144 } 1145 1146 WARN_ON(cm_id_priv->listen_sharecount); 1147 WARN_ON(!RB_EMPTY_NODE(&cm_id_priv->service_node)); 1148 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) 1149 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 1150 spin_unlock(&cm.lock); 1151 spin_unlock_irq(&cm_id_priv->lock); 1152 1153 xa_erase(&cm.local_id_table, cm_local_id(cm_id->local_id)); 1154 cm_deref_id(cm_id_priv); 1155 do { 1156 ret = wait_for_completion_timeout(&cm_id_priv->comp, 1157 msecs_to_jiffies( 1158 CM_DESTROY_ID_WAIT_TIMEOUT)); 1159 if (!ret) /* timeout happened */ 1160 cm_destroy_id_wait_timeout(cm_id, old_state); 1161 } while (!ret); 1162 1163 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 1164 cm_free_work(work); 1165 1166 cm_destroy_av(&cm_id_priv->av); 1167 cm_destroy_av(&cm_id_priv->alt_av); 1168 kfree(cm_id_priv->private_data); 1169 kfree_rcu(cm_id_priv, rcu); 1170 } 1171 1172 void ib_destroy_cm_id(struct ib_cm_id *cm_id) 1173 { 1174 cm_destroy_id(cm_id, 0); 1175 } 1176 EXPORT_SYMBOL(ib_destroy_cm_id); 1177 1178 static int cm_init_listen(struct cm_id_private *cm_id_priv, __be64 service_id) 1179 { 1180 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 1181 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 1182 return -EINVAL; 1183 1184 if (service_id == IB_CM_ASSIGN_SERVICE_ID) 1185 cm_id_priv->id.service_id = cpu_to_be64(cm.listen_service_id++); 1186 else 1187 cm_id_priv->id.service_id = service_id; 1188 1189 return 0; 1190 } 1191 1192 /** 1193 * ib_cm_listen - Initiates listening on the specified service ID for 1194 * connection and service ID resolution requests. 1195 * @cm_id: Connection identifier associated with the listen request. 1196 * @service_id: Service identifier matched against incoming connection 1197 * and service ID resolution requests. The service ID should be specified 1198 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1199 * assign a service ID to the caller. 1200 */ 1201 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id) 1202 { 1203 struct cm_id_private *cm_id_priv = 1204 container_of(cm_id, struct cm_id_private, id); 1205 unsigned long flags; 1206 int ret; 1207 1208 spin_lock_irqsave(&cm_id_priv->lock, flags); 1209 if (cm_id_priv->id.state != IB_CM_IDLE) { 1210 ret = -EINVAL; 1211 goto out; 1212 } 1213 1214 ret = cm_init_listen(cm_id_priv, service_id); 1215 if (ret) 1216 goto out; 1217 1218 if (!cm_insert_listen(cm_id_priv, NULL)) { 1219 ret = -EBUSY; 1220 goto out; 1221 } 1222 1223 cm_id_priv->id.state = IB_CM_LISTEN; 1224 ret = 0; 1225 1226 out: 1227 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1228 return ret; 1229 } 1230 EXPORT_SYMBOL(ib_cm_listen); 1231 1232 /** 1233 * ib_cm_insert_listen - Create a new listening ib_cm_id and listen on 1234 * the given service ID. 1235 * 1236 * If there's an existing ID listening on that same device and service ID, 1237 * return it. 1238 * 1239 * @device: Device associated with the cm_id. All related communication will 1240 * be associated with the specified device. 1241 * @cm_handler: Callback invoked to notify the user of CM events. 1242 * @service_id: Service identifier matched against incoming connection 1243 * and service ID resolution requests. The service ID should be specified 1244 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1245 * assign a service ID to the caller. 1246 * 1247 * Callers should call ib_destroy_cm_id when done with the listener ID. 1248 */ 1249 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device, 1250 ib_cm_handler cm_handler, 1251 __be64 service_id) 1252 { 1253 struct cm_id_private *listen_id_priv; 1254 struct cm_id_private *cm_id_priv; 1255 int err = 0; 1256 1257 /* Create an ID in advance, since the creation may sleep */ 1258 cm_id_priv = cm_alloc_id_priv(device, cm_handler, NULL); 1259 if (IS_ERR(cm_id_priv)) 1260 return ERR_CAST(cm_id_priv); 1261 1262 err = cm_init_listen(cm_id_priv, service_id); 1263 if (err) { 1264 ib_destroy_cm_id(&cm_id_priv->id); 1265 return ERR_PTR(err); 1266 } 1267 1268 spin_lock_irq(&cm_id_priv->lock); 1269 listen_id_priv = cm_insert_listen(cm_id_priv, cm_handler); 1270 if (listen_id_priv != cm_id_priv) { 1271 spin_unlock_irq(&cm_id_priv->lock); 1272 ib_destroy_cm_id(&cm_id_priv->id); 1273 if (!listen_id_priv) 1274 return ERR_PTR(-EINVAL); 1275 return &listen_id_priv->id; 1276 } 1277 cm_id_priv->id.state = IB_CM_LISTEN; 1278 spin_unlock_irq(&cm_id_priv->lock); 1279 1280 /* 1281 * A listen ID does not need to be in the xarray since it does not 1282 * receive mads, is not placed in the remote_id or remote_qpn rbtree, 1283 * and does not enter timewait. 1284 */ 1285 1286 return &cm_id_priv->id; 1287 } 1288 EXPORT_SYMBOL(ib_cm_insert_listen); 1289 1290 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv) 1291 { 1292 u64 hi_tid = 0, low_tid; 1293 1294 lockdep_assert_held(&cm_id_priv->lock); 1295 1296 low_tid = (u64)cm_id_priv->id.local_id; 1297 if (!cm_id_priv->av.port) 1298 return cpu_to_be64(low_tid); 1299 1300 read_lock(&cm_id_priv->av.port->cm_dev->mad_agent_lock); 1301 if (cm_id_priv->av.port->mad_agent) 1302 hi_tid = ((u64)cm_id_priv->av.port->mad_agent->hi_tid) << 32; 1303 read_unlock(&cm_id_priv->av.port->cm_dev->mad_agent_lock); 1304 return cpu_to_be64(hi_tid | low_tid); 1305 } 1306 1307 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 1308 __be16 attr_id, __be64 tid) 1309 { 1310 hdr->base_version = IB_MGMT_BASE_VERSION; 1311 hdr->mgmt_class = IB_MGMT_CLASS_CM; 1312 hdr->class_version = IB_CM_CLASS_VERSION; 1313 hdr->method = IB_MGMT_METHOD_SEND; 1314 hdr->attr_id = attr_id; 1315 hdr->tid = tid; 1316 } 1317 1318 static void cm_format_mad_ece_hdr(struct ib_mad_hdr *hdr, __be16 attr_id, 1319 __be64 tid, u32 attr_mod) 1320 { 1321 cm_format_mad_hdr(hdr, attr_id, tid); 1322 hdr->attr_mod = cpu_to_be32(attr_mod); 1323 } 1324 1325 static void cm_format_req(struct cm_req_msg *req_msg, 1326 struct cm_id_private *cm_id_priv, 1327 struct ib_cm_req_param *param) 1328 { 1329 struct sa_path_rec *pri_path = param->primary_path; 1330 struct sa_path_rec *alt_path = param->alternate_path; 1331 bool pri_ext = false; 1332 __be16 lid; 1333 1334 if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA) 1335 pri_ext = opa_is_extended_lid(pri_path->opa.dlid, 1336 pri_path->opa.slid); 1337 1338 cm_format_mad_ece_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1339 cm_form_tid(cm_id_priv), param->ece.attr_mod); 1340 1341 IBA_SET(CM_REQ_LOCAL_COMM_ID, req_msg, 1342 be32_to_cpu(cm_id_priv->id.local_id)); 1343 IBA_SET(CM_REQ_SERVICE_ID, req_msg, be64_to_cpu(param->service_id)); 1344 IBA_SET(CM_REQ_LOCAL_CA_GUID, req_msg, 1345 be64_to_cpu(cm_id_priv->id.device->node_guid)); 1346 IBA_SET(CM_REQ_LOCAL_QPN, req_msg, param->qp_num); 1347 IBA_SET(CM_REQ_INITIATOR_DEPTH, req_msg, param->initiator_depth); 1348 IBA_SET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg, 1349 param->remote_cm_response_timeout); 1350 cm_req_set_qp_type(req_msg, param->qp_type); 1351 IBA_SET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg, param->flow_control); 1352 IBA_SET(CM_REQ_STARTING_PSN, req_msg, param->starting_psn); 1353 IBA_SET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg, 1354 param->local_cm_response_timeout); 1355 IBA_SET(CM_REQ_PARTITION_KEY, req_msg, 1356 be16_to_cpu(param->primary_path->pkey)); 1357 IBA_SET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg, 1358 param->primary_path->mtu); 1359 IBA_SET(CM_REQ_MAX_CM_RETRIES, req_msg, param->max_cm_retries); 1360 1361 if (param->qp_type != IB_QPT_XRC_INI) { 1362 IBA_SET(CM_REQ_RESPONDER_RESOURCES, req_msg, 1363 param->responder_resources); 1364 IBA_SET(CM_REQ_RETRY_COUNT, req_msg, param->retry_count); 1365 IBA_SET(CM_REQ_RNR_RETRY_COUNT, req_msg, 1366 param->rnr_retry_count); 1367 IBA_SET(CM_REQ_SRQ, req_msg, param->srq); 1368 } 1369 1370 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) = 1371 pri_path->sgid; 1372 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) = 1373 pri_path->dgid; 1374 if (pri_ext) { 1375 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) 1376 ->global.interface_id = 1377 OPA_MAKE_ID(be32_to_cpu(pri_path->opa.slid)); 1378 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) 1379 ->global.interface_id = 1380 OPA_MAKE_ID(be32_to_cpu(pri_path->opa.dlid)); 1381 } 1382 if (pri_path->hop_limit <= 1) { 1383 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 1384 be16_to_cpu(pri_ext ? 0 : 1385 htons(ntohl(sa_path_get_slid( 1386 pri_path))))); 1387 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, 1388 be16_to_cpu(pri_ext ? 0 : 1389 htons(ntohl(sa_path_get_dlid( 1390 pri_path))))); 1391 } else { 1392 1393 if (param->primary_path_inbound) { 1394 lid = param->primary_path_inbound->ib.dlid; 1395 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 1396 be16_to_cpu(lid)); 1397 } else 1398 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 1399 be16_to_cpu(IB_LID_PERMISSIVE)); 1400 1401 /* Work-around until there's a way to obtain remote LID info */ 1402 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, 1403 be16_to_cpu(IB_LID_PERMISSIVE)); 1404 } 1405 IBA_SET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg, 1406 be32_to_cpu(pri_path->flow_label)); 1407 IBA_SET(CM_REQ_PRIMARY_PACKET_RATE, req_msg, pri_path->rate); 1408 IBA_SET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg, pri_path->traffic_class); 1409 IBA_SET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg, pri_path->hop_limit); 1410 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, pri_path->sl); 1411 IBA_SET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg, 1412 (pri_path->hop_limit <= 1)); 1413 IBA_SET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg, 1414 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1415 pri_path->packet_life_time)); 1416 1417 if (alt_path) { 1418 bool alt_ext = false; 1419 1420 if (alt_path->rec_type == SA_PATH_REC_TYPE_OPA) 1421 alt_ext = opa_is_extended_lid(alt_path->opa.dlid, 1422 alt_path->opa.slid); 1423 1424 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg) = 1425 alt_path->sgid; 1426 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg) = 1427 alt_path->dgid; 1428 if (alt_ext) { 1429 IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, 1430 req_msg) 1431 ->global.interface_id = 1432 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.slid)); 1433 IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, 1434 req_msg) 1435 ->global.interface_id = 1436 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.dlid)); 1437 } 1438 if (alt_path->hop_limit <= 1) { 1439 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, 1440 be16_to_cpu( 1441 alt_ext ? 0 : 1442 htons(ntohl(sa_path_get_slid( 1443 alt_path))))); 1444 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, 1445 be16_to_cpu( 1446 alt_ext ? 0 : 1447 htons(ntohl(sa_path_get_dlid( 1448 alt_path))))); 1449 } else { 1450 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, 1451 be16_to_cpu(IB_LID_PERMISSIVE)); 1452 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, 1453 be16_to_cpu(IB_LID_PERMISSIVE)); 1454 } 1455 IBA_SET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg, 1456 be32_to_cpu(alt_path->flow_label)); 1457 IBA_SET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg, alt_path->rate); 1458 IBA_SET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg, 1459 alt_path->traffic_class); 1460 IBA_SET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg, 1461 alt_path->hop_limit); 1462 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, alt_path->sl); 1463 IBA_SET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg, 1464 (alt_path->hop_limit <= 1)); 1465 IBA_SET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg, 1466 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1467 alt_path->packet_life_time)); 1468 } 1469 IBA_SET(CM_REQ_VENDOR_ID, req_msg, param->ece.vendor_id); 1470 1471 if (param->private_data && param->private_data_len) 1472 IBA_SET_MEM(CM_REQ_PRIVATE_DATA, req_msg, param->private_data, 1473 param->private_data_len); 1474 } 1475 1476 static int cm_validate_req_param(struct ib_cm_req_param *param) 1477 { 1478 if (!param->primary_path) 1479 return -EINVAL; 1480 1481 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC && 1482 param->qp_type != IB_QPT_XRC_INI) 1483 return -EINVAL; 1484 1485 if (param->private_data && 1486 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1487 return -EINVAL; 1488 1489 if (param->alternate_path && 1490 (param->alternate_path->pkey != param->primary_path->pkey || 1491 param->alternate_path->mtu != param->primary_path->mtu)) 1492 return -EINVAL; 1493 1494 return 0; 1495 } 1496 1497 int ib_send_cm_req(struct ib_cm_id *cm_id, 1498 struct ib_cm_req_param *param) 1499 { 1500 struct cm_av av = {}, alt_av = {}; 1501 struct cm_id_private *cm_id_priv; 1502 struct ib_mad_send_buf *msg; 1503 struct cm_req_msg *req_msg; 1504 unsigned long flags; 1505 int ret; 1506 1507 ret = cm_validate_req_param(param); 1508 if (ret) 1509 return ret; 1510 1511 /* Verify that we're not in timewait. */ 1512 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1513 spin_lock_irqsave(&cm_id_priv->lock, flags); 1514 if (cm_id->state != IB_CM_IDLE || WARN_ON(cm_id_priv->timewait_info)) { 1515 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1516 return -EINVAL; 1517 } 1518 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1519 1520 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1521 id.local_id); 1522 if (IS_ERR(cm_id_priv->timewait_info)) { 1523 ret = PTR_ERR(cm_id_priv->timewait_info); 1524 cm_id_priv->timewait_info = NULL; 1525 return ret; 1526 } 1527 1528 ret = cm_init_av_by_path(param->primary_path, 1529 param->ppath_sgid_attr, &av); 1530 if (ret) 1531 return ret; 1532 if (param->alternate_path) { 1533 ret = cm_init_av_by_path(param->alternate_path, NULL, 1534 &alt_av); 1535 if (ret) { 1536 cm_destroy_av(&av); 1537 return ret; 1538 } 1539 } 1540 cm_id->service_id = param->service_id; 1541 cm_id_priv->timeout_ms = cm_convert_to_ms( 1542 param->primary_path->packet_life_time) * 2 + 1543 cm_convert_to_ms( 1544 param->remote_cm_response_timeout); 1545 cm_id_priv->max_cm_retries = param->max_cm_retries; 1546 cm_id_priv->initiator_depth = param->initiator_depth; 1547 cm_id_priv->responder_resources = param->responder_resources; 1548 cm_id_priv->retry_count = param->retry_count; 1549 cm_id_priv->path_mtu = param->primary_path->mtu; 1550 cm_id_priv->pkey = param->primary_path->pkey; 1551 cm_id_priv->qp_type = param->qp_type; 1552 1553 spin_lock_irqsave(&cm_id_priv->lock, flags); 1554 1555 cm_move_av_from_path(&cm_id_priv->av, &av); 1556 if (param->primary_path_outbound) 1557 cm_id_priv->av.dlid_datapath = 1558 be16_to_cpu(param->primary_path_outbound->ib.dlid); 1559 1560 if (param->alternate_path) 1561 cm_move_av_from_path(&cm_id_priv->alt_av, &alt_av); 1562 1563 msg = cm_alloc_priv_msg(cm_id_priv, IB_CM_REQ_SENT); 1564 if (IS_ERR(msg)) { 1565 ret = PTR_ERR(msg); 1566 goto out_unlock; 1567 } 1568 1569 req_msg = (struct cm_req_msg *)msg->mad; 1570 cm_format_req(req_msg, cm_id_priv, param); 1571 cm_id_priv->tid = req_msg->hdr.tid; 1572 1573 cm_id_priv->local_qpn = cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg)); 1574 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg)); 1575 1576 trace_icm_send_req(&cm_id_priv->id); 1577 ret = ib_post_send_mad(msg, NULL); 1578 if (ret) 1579 goto out_free; 1580 BUG_ON(cm_id->state != IB_CM_IDLE); 1581 cm_id->state = IB_CM_REQ_SENT; 1582 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1583 return 0; 1584 out_free: 1585 cm_free_priv_msg(msg); 1586 out_unlock: 1587 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1588 return ret; 1589 } 1590 EXPORT_SYMBOL(ib_send_cm_req); 1591 1592 static int cm_issue_rej(struct cm_port *port, 1593 struct ib_mad_recv_wc *mad_recv_wc, 1594 enum ib_cm_rej_reason reason, 1595 enum cm_msg_response msg_rejected, 1596 void *ari, u8 ari_length) 1597 { 1598 struct ib_mad_send_buf *msg = NULL; 1599 struct cm_rej_msg *rej_msg, *rcv_msg; 1600 int ret; 1601 1602 ret = cm_alloc_response_msg(port, mad_recv_wc, false, &msg); 1603 if (ret) 1604 return ret; 1605 1606 /* We just need common CM header information. Cast to any message. */ 1607 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1608 rej_msg = (struct cm_rej_msg *) msg->mad; 1609 1610 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1611 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg, 1612 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg)); 1613 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1614 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg)); 1615 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, msg_rejected); 1616 IBA_SET(CM_REJ_REASON, rej_msg, reason); 1617 1618 if (ari && ari_length) { 1619 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length); 1620 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length); 1621 } 1622 1623 trace_icm_issue_rej( 1624 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg), 1625 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg)); 1626 ret = ib_post_send_mad(msg, NULL); 1627 if (ret) 1628 cm_free_msg(msg); 1629 1630 return ret; 1631 } 1632 1633 static bool cm_req_has_alt_path(struct cm_req_msg *req_msg) 1634 { 1635 return ((cpu_to_be16( 1636 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg))) || 1637 (ib_is_opa_gid(IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, 1638 req_msg)))); 1639 } 1640 1641 static void cm_path_set_rec_type(struct ib_device *ib_device, u32 port_num, 1642 struct sa_path_rec *path, union ib_gid *gid) 1643 { 1644 if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num)) 1645 path->rec_type = SA_PATH_REC_TYPE_OPA; 1646 else 1647 path->rec_type = SA_PATH_REC_TYPE_IB; 1648 } 1649 1650 static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg, 1651 struct sa_path_rec *primary_path, 1652 struct sa_path_rec *alt_path, 1653 struct ib_wc *wc) 1654 { 1655 u32 lid; 1656 1657 if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) { 1658 sa_path_set_dlid(primary_path, wc->slid); 1659 sa_path_set_slid(primary_path, 1660 IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID, 1661 req_msg)); 1662 } else { 1663 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1664 CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg)); 1665 sa_path_set_dlid(primary_path, lid); 1666 1667 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1668 CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg)); 1669 sa_path_set_slid(primary_path, lid); 1670 } 1671 1672 if (!cm_req_has_alt_path(req_msg)) 1673 return; 1674 1675 if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) { 1676 sa_path_set_dlid(alt_path, 1677 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, 1678 req_msg)); 1679 sa_path_set_slid(alt_path, 1680 IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, 1681 req_msg)); 1682 } else { 1683 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1684 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg)); 1685 sa_path_set_dlid(alt_path, lid); 1686 1687 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1688 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg)); 1689 sa_path_set_slid(alt_path, lid); 1690 } 1691 } 1692 1693 static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1694 struct sa_path_rec *primary_path, 1695 struct sa_path_rec *alt_path, 1696 struct ib_wc *wc) 1697 { 1698 primary_path->dgid = 1699 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg); 1700 primary_path->sgid = 1701 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg); 1702 primary_path->flow_label = 1703 cpu_to_be32(IBA_GET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg)); 1704 primary_path->hop_limit = IBA_GET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg); 1705 primary_path->traffic_class = 1706 IBA_GET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg); 1707 primary_path->reversible = 1; 1708 primary_path->pkey = 1709 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 1710 primary_path->sl = IBA_GET(CM_REQ_PRIMARY_SL, req_msg); 1711 primary_path->mtu_selector = IB_SA_EQ; 1712 primary_path->mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 1713 primary_path->rate_selector = IB_SA_EQ; 1714 primary_path->rate = IBA_GET(CM_REQ_PRIMARY_PACKET_RATE, req_msg); 1715 primary_path->packet_life_time_selector = IB_SA_EQ; 1716 primary_path->packet_life_time = 1717 IBA_GET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg); 1718 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1719 primary_path->service_id = 1720 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 1721 if (sa_path_is_roce(primary_path)) 1722 primary_path->roce.route_resolved = false; 1723 1724 if (cm_req_has_alt_path(req_msg)) { 1725 alt_path->dgid = *IBA_GET_MEM_PTR( 1726 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg); 1727 alt_path->sgid = *IBA_GET_MEM_PTR( 1728 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg); 1729 alt_path->flow_label = cpu_to_be32( 1730 IBA_GET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg)); 1731 alt_path->hop_limit = 1732 IBA_GET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg); 1733 alt_path->traffic_class = 1734 IBA_GET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg); 1735 alt_path->reversible = 1; 1736 alt_path->pkey = 1737 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 1738 alt_path->sl = IBA_GET(CM_REQ_ALTERNATE_SL, req_msg); 1739 alt_path->mtu_selector = IB_SA_EQ; 1740 alt_path->mtu = 1741 IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 1742 alt_path->rate_selector = IB_SA_EQ; 1743 alt_path->rate = IBA_GET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg); 1744 alt_path->packet_life_time_selector = IB_SA_EQ; 1745 alt_path->packet_life_time = 1746 IBA_GET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg); 1747 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1748 alt_path->service_id = 1749 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 1750 1751 if (sa_path_is_roce(alt_path)) 1752 alt_path->roce.route_resolved = false; 1753 } 1754 cm_format_path_lid_from_req(req_msg, primary_path, alt_path, wc); 1755 } 1756 1757 static u16 cm_get_bth_pkey(struct cm_work *work) 1758 { 1759 struct ib_device *ib_dev = work->port->cm_dev->ib_device; 1760 u32 port_num = work->port->port_num; 1761 u16 pkey_index = work->mad_recv_wc->wc->pkey_index; 1762 u16 pkey; 1763 int ret; 1764 1765 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey); 1766 if (ret) { 1767 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %u, pkey index %u). %d\n", 1768 port_num, pkey_index, ret); 1769 return 0; 1770 } 1771 1772 return pkey; 1773 } 1774 1775 /** 1776 * cm_opa_to_ib_sgid - Convert OPA SGID to IB SGID 1777 * ULPs (such as IPoIB) do not understand OPA GIDs and will 1778 * reject them as the local_gid will not match the sgid. Therefore, 1779 * change the pathrec's SGID to an IB SGID. 1780 * 1781 * @work: Work completion 1782 * @path: Path record 1783 */ 1784 static void cm_opa_to_ib_sgid(struct cm_work *work, 1785 struct sa_path_rec *path) 1786 { 1787 struct ib_device *dev = work->port->cm_dev->ib_device; 1788 u32 port_num = work->port->port_num; 1789 1790 if (rdma_cap_opa_ah(dev, port_num) && 1791 (ib_is_opa_gid(&path->sgid))) { 1792 union ib_gid sgid; 1793 1794 if (rdma_query_gid(dev, port_num, 0, &sgid)) { 1795 dev_warn(&dev->dev, 1796 "Error updating sgid in CM request\n"); 1797 return; 1798 } 1799 1800 path->sgid = sgid; 1801 } 1802 } 1803 1804 static void cm_format_req_event(struct cm_work *work, 1805 struct cm_id_private *cm_id_priv, 1806 struct ib_cm_id *listen_id) 1807 { 1808 struct cm_req_msg *req_msg; 1809 struct ib_cm_req_event_param *param; 1810 1811 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1812 param = &work->cm_event.param.req_rcvd; 1813 param->listen_id = listen_id; 1814 param->bth_pkey = cm_get_bth_pkey(work); 1815 param->port = cm_id_priv->av.port->port_num; 1816 param->primary_path = &work->path[0]; 1817 cm_opa_to_ib_sgid(work, param->primary_path); 1818 if (cm_req_has_alt_path(req_msg)) { 1819 param->alternate_path = &work->path[1]; 1820 cm_opa_to_ib_sgid(work, param->alternate_path); 1821 } else { 1822 param->alternate_path = NULL; 1823 } 1824 param->remote_ca_guid = 1825 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg)); 1826 param->remote_qkey = IBA_GET(CM_REQ_LOCAL_Q_KEY, req_msg); 1827 param->remote_qpn = IBA_GET(CM_REQ_LOCAL_QPN, req_msg); 1828 param->qp_type = cm_req_get_qp_type(req_msg); 1829 param->starting_psn = IBA_GET(CM_REQ_STARTING_PSN, req_msg); 1830 param->responder_resources = IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg); 1831 param->initiator_depth = IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg); 1832 param->local_cm_response_timeout = 1833 IBA_GET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg); 1834 param->flow_control = IBA_GET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg); 1835 param->remote_cm_response_timeout = 1836 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg); 1837 param->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg); 1838 param->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg); 1839 param->srq = IBA_GET(CM_REQ_SRQ, req_msg); 1840 param->ppath_sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr; 1841 param->ece.vendor_id = IBA_GET(CM_REQ_VENDOR_ID, req_msg); 1842 param->ece.attr_mod = be32_to_cpu(req_msg->hdr.attr_mod); 1843 1844 work->cm_event.private_data = 1845 IBA_GET_MEM_PTR(CM_REQ_PRIVATE_DATA, req_msg); 1846 } 1847 1848 static void cm_process_work(struct cm_id_private *cm_id_priv, 1849 struct cm_work *work) 1850 { 1851 int ret; 1852 1853 /* We will typically only have the current event to report. */ 1854 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1855 cm_free_work(work); 1856 1857 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1858 spin_lock_irq(&cm_id_priv->lock); 1859 work = cm_dequeue_work(cm_id_priv); 1860 spin_unlock_irq(&cm_id_priv->lock); 1861 if (!work) 1862 return; 1863 1864 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1865 &work->cm_event); 1866 cm_free_work(work); 1867 } 1868 cm_deref_id(cm_id_priv); 1869 if (ret) 1870 cm_destroy_id(&cm_id_priv->id, ret); 1871 } 1872 1873 static void cm_format_mra(struct cm_mra_msg *mra_msg, 1874 struct cm_id_private *cm_id_priv, 1875 enum cm_msg_response msg_mraed, 1876 const void *private_data, u8 private_data_len) 1877 { 1878 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1879 IBA_SET(CM_MRA_MESSAGE_MRAED, mra_msg, msg_mraed); 1880 IBA_SET(CM_MRA_LOCAL_COMM_ID, mra_msg, 1881 be32_to_cpu(cm_id_priv->id.local_id)); 1882 IBA_SET(CM_MRA_REMOTE_COMM_ID, mra_msg, 1883 be32_to_cpu(cm_id_priv->id.remote_id)); 1884 IBA_SET(CM_MRA_SERVICE_TIMEOUT, mra_msg, CM_MRA_SETTING); 1885 1886 if (private_data && private_data_len) 1887 IBA_SET_MEM(CM_MRA_PRIVATE_DATA, mra_msg, private_data, 1888 private_data_len); 1889 } 1890 1891 static void cm_format_rej(struct cm_rej_msg *rej_msg, 1892 struct cm_id_private *cm_id_priv, 1893 enum ib_cm_rej_reason reason, void *ari, 1894 u8 ari_length, const void *private_data, 1895 u8 private_data_len, enum ib_cm_state state) 1896 { 1897 lockdep_assert_held(&cm_id_priv->lock); 1898 1899 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1900 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg, 1901 be32_to_cpu(cm_id_priv->id.remote_id)); 1902 1903 switch (state) { 1904 case IB_CM_REQ_RCVD: 1905 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, be32_to_cpu(0)); 1906 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ); 1907 break; 1908 case IB_CM_MRA_REQ_SENT: 1909 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1910 be32_to_cpu(cm_id_priv->id.local_id)); 1911 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ); 1912 break; 1913 case IB_CM_REP_RCVD: 1914 case IB_CM_MRA_REP_SENT: 1915 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1916 be32_to_cpu(cm_id_priv->id.local_id)); 1917 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REP); 1918 break; 1919 default: 1920 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1921 be32_to_cpu(cm_id_priv->id.local_id)); 1922 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, 1923 CM_MSG_RESPONSE_OTHER); 1924 break; 1925 } 1926 1927 IBA_SET(CM_REJ_REASON, rej_msg, reason); 1928 if (ari && ari_length) { 1929 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length); 1930 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length); 1931 } 1932 1933 if (private_data && private_data_len) 1934 IBA_SET_MEM(CM_REJ_PRIVATE_DATA, rej_msg, private_data, 1935 private_data_len); 1936 } 1937 1938 static void cm_dup_req_handler(struct cm_work *work, 1939 struct cm_id_private *cm_id_priv) 1940 { 1941 struct ib_mad_send_buf *msg = NULL; 1942 int ret; 1943 1944 atomic_long_inc( 1945 &work->port->counters[CM_RECV_DUPLICATES][CM_REQ_COUNTER]); 1946 1947 /* Quick state check to discard duplicate REQs. */ 1948 spin_lock_irq(&cm_id_priv->lock); 1949 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) { 1950 spin_unlock_irq(&cm_id_priv->lock); 1951 return; 1952 } 1953 spin_unlock_irq(&cm_id_priv->lock); 1954 1955 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, true, &msg); 1956 if (ret) 1957 return; 1958 1959 spin_lock_irq(&cm_id_priv->lock); 1960 switch (cm_id_priv->id.state) { 1961 case IB_CM_MRA_REQ_SENT: 1962 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1963 CM_MSG_RESPONSE_REQ, 1964 cm_id_priv->private_data, 1965 cm_id_priv->private_data_len); 1966 break; 1967 case IB_CM_TIMEWAIT: 1968 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, 1969 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0, 1970 IB_CM_TIMEWAIT); 1971 break; 1972 default: 1973 goto unlock; 1974 } 1975 spin_unlock_irq(&cm_id_priv->lock); 1976 1977 trace_icm_send_dup_req(&cm_id_priv->id); 1978 ret = ib_post_send_mad(msg, NULL); 1979 if (ret) 1980 goto free; 1981 return; 1982 1983 unlock: spin_unlock_irq(&cm_id_priv->lock); 1984 free: cm_free_msg(msg); 1985 } 1986 1987 static struct cm_id_private *cm_match_req(struct cm_work *work, 1988 struct cm_id_private *cm_id_priv) 1989 { 1990 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1991 struct cm_timewait_info *timewait_info; 1992 struct cm_req_msg *req_msg; 1993 1994 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1995 1996 /* Check for possible duplicate REQ. */ 1997 spin_lock_irq(&cm.lock); 1998 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1999 if (timewait_info) { 2000 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2001 timewait_info->work.remote_id); 2002 spin_unlock_irq(&cm.lock); 2003 if (cur_cm_id_priv) { 2004 cm_dup_req_handler(work, cur_cm_id_priv); 2005 cm_deref_id(cur_cm_id_priv); 2006 } 2007 return NULL; 2008 } 2009 2010 /* Check for stale connections. */ 2011 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 2012 if (timewait_info) { 2013 cm_remove_remote(cm_id_priv); 2014 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2015 timewait_info->work.remote_id); 2016 2017 spin_unlock_irq(&cm.lock); 2018 cm_issue_rej(work->port, work->mad_recv_wc, 2019 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 2020 NULL, 0); 2021 if (cur_cm_id_priv) { 2022 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0); 2023 cm_deref_id(cur_cm_id_priv); 2024 } 2025 return NULL; 2026 } 2027 2028 /* Find matching listen request. */ 2029 listen_cm_id_priv = cm_find_listen( 2030 cm_id_priv->id.device, 2031 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg))); 2032 if (!listen_cm_id_priv) { 2033 cm_remove_remote(cm_id_priv); 2034 spin_unlock_irq(&cm.lock); 2035 cm_issue_rej(work->port, work->mad_recv_wc, 2036 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 2037 NULL, 0); 2038 return NULL; 2039 } 2040 spin_unlock_irq(&cm.lock); 2041 return listen_cm_id_priv; 2042 } 2043 2044 /* 2045 * Work-around for inter-subnet connections. If the LIDs are permissive, 2046 * we need to override the LID/SL data in the REQ with the LID information 2047 * in the work completion. 2048 */ 2049 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 2050 { 2051 if (!IBA_GET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg)) { 2052 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID, 2053 req_msg)) == IB_LID_PERMISSIVE) { 2054 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 2055 be16_to_cpu(ib_lid_be16(wc->slid))); 2056 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, wc->sl); 2057 } 2058 2059 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID, 2060 req_msg)) == IB_LID_PERMISSIVE) 2061 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, 2062 wc->dlid_path_bits); 2063 } 2064 2065 if (!IBA_GET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg)) { 2066 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, 2067 req_msg)) == IB_LID_PERMISSIVE) { 2068 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, 2069 be16_to_cpu(ib_lid_be16(wc->slid))); 2070 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, wc->sl); 2071 } 2072 2073 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, 2074 req_msg)) == IB_LID_PERMISSIVE) 2075 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, 2076 wc->dlid_path_bits); 2077 } 2078 } 2079 2080 static int cm_req_handler(struct cm_work *work) 2081 { 2082 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 2083 struct cm_req_msg *req_msg; 2084 const struct ib_global_route *grh; 2085 const struct ib_gid_attr *gid_attr; 2086 int ret; 2087 2088 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 2089 2090 cm_id_priv = 2091 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL); 2092 if (IS_ERR(cm_id_priv)) 2093 return PTR_ERR(cm_id_priv); 2094 2095 cm_id_priv->id.remote_id = 2096 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_COMM_ID, req_msg)); 2097 cm_id_priv->id.service_id = 2098 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 2099 cm_id_priv->tid = req_msg->hdr.tid; 2100 cm_id_priv->timeout_ms = cm_convert_to_ms( 2101 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg)); 2102 cm_id_priv->max_cm_retries = IBA_GET(CM_REQ_MAX_CM_RETRIES, req_msg); 2103 cm_id_priv->remote_qpn = 2104 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg)); 2105 cm_id_priv->initiator_depth = 2106 IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg); 2107 cm_id_priv->responder_resources = 2108 IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg); 2109 cm_id_priv->path_mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 2110 cm_id_priv->pkey = cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 2111 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg)); 2112 cm_id_priv->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg); 2113 cm_id_priv->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg); 2114 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 2115 2116 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2117 work->mad_recv_wc->recv_buf.grh, 2118 &cm_id_priv->av); 2119 if (ret) 2120 goto destroy; 2121 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 2122 id.local_id); 2123 if (IS_ERR(cm_id_priv->timewait_info)) { 2124 ret = PTR_ERR(cm_id_priv->timewait_info); 2125 cm_id_priv->timewait_info = NULL; 2126 goto destroy; 2127 } 2128 cm_id_priv->timewait_info->work.remote_id = cm_id_priv->id.remote_id; 2129 cm_id_priv->timewait_info->remote_ca_guid = 2130 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg)); 2131 cm_id_priv->timewait_info->remote_qpn = cm_id_priv->remote_qpn; 2132 2133 /* 2134 * Note that the ID pointer is not in the xarray at this point, 2135 * so this set is only visible to the local thread. 2136 */ 2137 cm_id_priv->id.state = IB_CM_REQ_RCVD; 2138 2139 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 2140 if (!listen_cm_id_priv) { 2141 trace_icm_no_listener_err(&cm_id_priv->id); 2142 cm_id_priv->id.state = IB_CM_IDLE; 2143 ret = -EINVAL; 2144 goto destroy; 2145 } 2146 2147 memset(&work->path[0], 0, sizeof(work->path[0])); 2148 if (cm_req_has_alt_path(req_msg)) 2149 memset(&work->path[1], 0, sizeof(work->path[1])); 2150 grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr); 2151 gid_attr = grh->sgid_attr; 2152 2153 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE) { 2154 work->path[0].rec_type = 2155 sa_conv_gid_to_pathrec_type(gid_attr->gid_type); 2156 } else { 2157 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 2158 cm_path_set_rec_type( 2159 work->port->cm_dev->ib_device, work->port->port_num, 2160 &work->path[0], 2161 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, 2162 req_msg)); 2163 } 2164 if (cm_req_has_alt_path(req_msg)) 2165 work->path[1].rec_type = work->path[0].rec_type; 2166 cm_format_paths_from_req(req_msg, &work->path[0], 2167 &work->path[1], work->mad_recv_wc->wc); 2168 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE) 2169 sa_path_set_dmac(&work->path[0], 2170 cm_id_priv->av.ah_attr.roce.dmac); 2171 work->path[0].hop_limit = grh->hop_limit; 2172 2173 /* This destroy call is needed to pair with cm_init_av_for_response */ 2174 cm_destroy_av(&cm_id_priv->av); 2175 ret = cm_init_av_by_path(&work->path[0], gid_attr, &cm_id_priv->av); 2176 if (ret) { 2177 int err; 2178 2179 err = rdma_query_gid(work->port->cm_dev->ib_device, 2180 work->port->port_num, 0, 2181 &work->path[0].sgid); 2182 if (err) 2183 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID, 2184 NULL, 0, NULL, 0); 2185 else 2186 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID, 2187 &work->path[0].sgid, 2188 sizeof(work->path[0].sgid), 2189 NULL, 0); 2190 goto rejected; 2191 } 2192 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_IB) 2193 cm_id_priv->av.dlid_datapath = 2194 IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg); 2195 2196 if (cm_req_has_alt_path(req_msg)) { 2197 ret = cm_init_av_by_path(&work->path[1], NULL, 2198 &cm_id_priv->alt_av); 2199 if (ret) { 2200 ib_send_cm_rej(&cm_id_priv->id, 2201 IB_CM_REJ_INVALID_ALT_GID, 2202 &work->path[0].sgid, 2203 sizeof(work->path[0].sgid), NULL, 0); 2204 goto rejected; 2205 } 2206 } 2207 2208 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 2209 cm_id_priv->id.context = listen_cm_id_priv->id.context; 2210 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 2211 2212 /* Now MAD handlers can see the new ID */ 2213 spin_lock_irq(&cm_id_priv->lock); 2214 cm_finalize_id(cm_id_priv); 2215 2216 /* Refcount belongs to the event, pairs with cm_process_work() */ 2217 refcount_inc(&cm_id_priv->refcount); 2218 cm_queue_work_unlock(cm_id_priv, work); 2219 /* 2220 * Since this ID was just created and was not made visible to other MAD 2221 * handlers until the cm_finalize_id() above we know that the 2222 * cm_process_work() will deliver the event and the listen_cm_id 2223 * embedded in the event can be derefed here. 2224 */ 2225 cm_deref_id(listen_cm_id_priv); 2226 return 0; 2227 2228 rejected: 2229 cm_deref_id(listen_cm_id_priv); 2230 destroy: 2231 ib_destroy_cm_id(&cm_id_priv->id); 2232 return ret; 2233 } 2234 2235 static void cm_format_rep(struct cm_rep_msg *rep_msg, 2236 struct cm_id_private *cm_id_priv, 2237 struct ib_cm_rep_param *param) 2238 { 2239 cm_format_mad_ece_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid, 2240 param->ece.attr_mod); 2241 IBA_SET(CM_REP_LOCAL_COMM_ID, rep_msg, 2242 be32_to_cpu(cm_id_priv->id.local_id)); 2243 IBA_SET(CM_REP_REMOTE_COMM_ID, rep_msg, 2244 be32_to_cpu(cm_id_priv->id.remote_id)); 2245 IBA_SET(CM_REP_STARTING_PSN, rep_msg, param->starting_psn); 2246 IBA_SET(CM_REP_RESPONDER_RESOURCES, rep_msg, 2247 param->responder_resources); 2248 IBA_SET(CM_REP_TARGET_ACK_DELAY, rep_msg, 2249 cm_id_priv->av.port->cm_dev->ack_delay); 2250 IBA_SET(CM_REP_FAILOVER_ACCEPTED, rep_msg, param->failover_accepted); 2251 IBA_SET(CM_REP_RNR_RETRY_COUNT, rep_msg, param->rnr_retry_count); 2252 IBA_SET(CM_REP_LOCAL_CA_GUID, rep_msg, 2253 be64_to_cpu(cm_id_priv->id.device->node_guid)); 2254 2255 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) { 2256 IBA_SET(CM_REP_INITIATOR_DEPTH, rep_msg, 2257 param->initiator_depth); 2258 IBA_SET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg, 2259 param->flow_control); 2260 IBA_SET(CM_REP_SRQ, rep_msg, param->srq); 2261 IBA_SET(CM_REP_LOCAL_QPN, rep_msg, param->qp_num); 2262 } else { 2263 IBA_SET(CM_REP_SRQ, rep_msg, 1); 2264 IBA_SET(CM_REP_LOCAL_EE_CONTEXT_NUMBER, rep_msg, param->qp_num); 2265 } 2266 2267 IBA_SET(CM_REP_VENDOR_ID_L, rep_msg, param->ece.vendor_id); 2268 IBA_SET(CM_REP_VENDOR_ID_M, rep_msg, param->ece.vendor_id >> 8); 2269 IBA_SET(CM_REP_VENDOR_ID_H, rep_msg, param->ece.vendor_id >> 16); 2270 2271 if (param->private_data && param->private_data_len) 2272 IBA_SET_MEM(CM_REP_PRIVATE_DATA, rep_msg, param->private_data, 2273 param->private_data_len); 2274 } 2275 2276 int ib_send_cm_rep(struct ib_cm_id *cm_id, 2277 struct ib_cm_rep_param *param) 2278 { 2279 struct cm_id_private *cm_id_priv; 2280 struct ib_mad_send_buf *msg; 2281 struct cm_rep_msg *rep_msg; 2282 unsigned long flags; 2283 int ret; 2284 2285 if (param->private_data && 2286 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 2287 return -EINVAL; 2288 2289 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2290 spin_lock_irqsave(&cm_id_priv->lock, flags); 2291 if (cm_id->state != IB_CM_REQ_RCVD && 2292 cm_id->state != IB_CM_MRA_REQ_SENT) { 2293 trace_icm_send_rep_err(cm_id_priv->id.local_id, cm_id->state); 2294 ret = -EINVAL; 2295 goto out; 2296 } 2297 2298 msg = cm_alloc_priv_msg(cm_id_priv, IB_CM_REP_SENT); 2299 if (IS_ERR(msg)) { 2300 ret = PTR_ERR(msg); 2301 goto out; 2302 } 2303 2304 rep_msg = (struct cm_rep_msg *) msg->mad; 2305 cm_format_rep(rep_msg, cm_id_priv, param); 2306 2307 trace_icm_send_rep(cm_id); 2308 ret = ib_post_send_mad(msg, NULL); 2309 if (ret) 2310 goto out_free; 2311 2312 cm_id->state = IB_CM_REP_SENT; 2313 cm_id_priv->initiator_depth = param->initiator_depth; 2314 cm_id_priv->responder_resources = param->responder_resources; 2315 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg)); 2316 WARN_ONCE(param->qp_num & 0xFF000000, 2317 "IBTA declares QPN to be 24 bits, but it is 0x%X\n", 2318 param->qp_num); 2319 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF); 2320 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2321 return 0; 2322 2323 out_free: 2324 cm_free_priv_msg(msg); 2325 out: 2326 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2327 return ret; 2328 } 2329 EXPORT_SYMBOL(ib_send_cm_rep); 2330 2331 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 2332 struct cm_id_private *cm_id_priv, 2333 const void *private_data, 2334 u8 private_data_len) 2335 { 2336 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 2337 IBA_SET(CM_RTU_LOCAL_COMM_ID, rtu_msg, 2338 be32_to_cpu(cm_id_priv->id.local_id)); 2339 IBA_SET(CM_RTU_REMOTE_COMM_ID, rtu_msg, 2340 be32_to_cpu(cm_id_priv->id.remote_id)); 2341 2342 if (private_data && private_data_len) 2343 IBA_SET_MEM(CM_RTU_PRIVATE_DATA, rtu_msg, private_data, 2344 private_data_len); 2345 } 2346 2347 int ib_send_cm_rtu(struct ib_cm_id *cm_id, 2348 const void *private_data, 2349 u8 private_data_len) 2350 { 2351 struct cm_id_private *cm_id_priv; 2352 struct ib_mad_send_buf *msg; 2353 unsigned long flags; 2354 void *data; 2355 int ret; 2356 2357 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 2358 return -EINVAL; 2359 2360 data = cm_copy_private_data(private_data, private_data_len); 2361 if (IS_ERR(data)) 2362 return PTR_ERR(data); 2363 2364 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2365 spin_lock_irqsave(&cm_id_priv->lock, flags); 2366 if (cm_id->state != IB_CM_REP_RCVD && 2367 cm_id->state != IB_CM_MRA_REP_SENT) { 2368 trace_icm_send_cm_rtu_err(cm_id); 2369 ret = -EINVAL; 2370 goto error; 2371 } 2372 2373 msg = cm_alloc_msg(cm_id_priv); 2374 if (IS_ERR(msg)) { 2375 ret = PTR_ERR(msg); 2376 goto error; 2377 } 2378 2379 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 2380 private_data, private_data_len); 2381 2382 trace_icm_send_rtu(cm_id); 2383 ret = ib_post_send_mad(msg, NULL); 2384 if (ret) { 2385 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2386 cm_free_msg(msg); 2387 kfree(data); 2388 return ret; 2389 } 2390 2391 cm_id->state = IB_CM_ESTABLISHED; 2392 cm_set_private_data(cm_id_priv, data, private_data_len); 2393 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2394 return 0; 2395 2396 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2397 kfree(data); 2398 return ret; 2399 } 2400 EXPORT_SYMBOL(ib_send_cm_rtu); 2401 2402 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type) 2403 { 2404 struct cm_rep_msg *rep_msg; 2405 struct ib_cm_rep_event_param *param; 2406 2407 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 2408 param = &work->cm_event.param.rep_rcvd; 2409 param->remote_ca_guid = 2410 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg)); 2411 param->remote_qkey = IBA_GET(CM_REP_LOCAL_Q_KEY, rep_msg); 2412 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type)); 2413 param->starting_psn = IBA_GET(CM_REP_STARTING_PSN, rep_msg); 2414 param->responder_resources = IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg); 2415 param->initiator_depth = IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg); 2416 param->target_ack_delay = IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg); 2417 param->failover_accepted = IBA_GET(CM_REP_FAILOVER_ACCEPTED, rep_msg); 2418 param->flow_control = IBA_GET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg); 2419 param->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg); 2420 param->srq = IBA_GET(CM_REP_SRQ, rep_msg); 2421 param->ece.vendor_id = IBA_GET(CM_REP_VENDOR_ID_H, rep_msg) << 16; 2422 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_M, rep_msg) << 8; 2423 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_L, rep_msg); 2424 param->ece.attr_mod = be32_to_cpu(rep_msg->hdr.attr_mod); 2425 2426 work->cm_event.private_data = 2427 IBA_GET_MEM_PTR(CM_REP_PRIVATE_DATA, rep_msg); 2428 } 2429 2430 static void cm_dup_rep_handler(struct cm_work *work) 2431 { 2432 struct cm_id_private *cm_id_priv; 2433 struct cm_rep_msg *rep_msg; 2434 struct ib_mad_send_buf *msg = NULL; 2435 int ret; 2436 2437 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 2438 cm_id_priv = cm_acquire_id( 2439 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 2440 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg))); 2441 if (!cm_id_priv) 2442 return; 2443 2444 atomic_long_inc( 2445 &work->port->counters[CM_RECV_DUPLICATES][CM_REP_COUNTER]); 2446 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, true, &msg); 2447 if (ret) 2448 goto deref; 2449 2450 spin_lock_irq(&cm_id_priv->lock); 2451 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 2452 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 2453 cm_id_priv->private_data, 2454 cm_id_priv->private_data_len); 2455 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 2456 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2457 CM_MSG_RESPONSE_REP, 2458 cm_id_priv->private_data, 2459 cm_id_priv->private_data_len); 2460 else 2461 goto unlock; 2462 spin_unlock_irq(&cm_id_priv->lock); 2463 2464 trace_icm_send_dup_rep(&cm_id_priv->id); 2465 ret = ib_post_send_mad(msg, NULL); 2466 if (ret) 2467 goto free; 2468 goto deref; 2469 2470 unlock: spin_unlock_irq(&cm_id_priv->lock); 2471 free: cm_free_msg(msg); 2472 deref: cm_deref_id(cm_id_priv); 2473 } 2474 2475 static int cm_rep_handler(struct cm_work *work) 2476 { 2477 struct cm_id_private *cm_id_priv; 2478 struct cm_rep_msg *rep_msg; 2479 int ret; 2480 struct cm_id_private *cur_cm_id_priv; 2481 struct cm_timewait_info *timewait_info; 2482 2483 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 2484 cm_id_priv = cm_acquire_id( 2485 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 0); 2486 if (!cm_id_priv) { 2487 cm_dup_rep_handler(work); 2488 trace_icm_remote_no_priv_err( 2489 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2490 return -EINVAL; 2491 } 2492 2493 cm_format_rep_event(work, cm_id_priv->qp_type); 2494 2495 spin_lock_irq(&cm_id_priv->lock); 2496 switch (cm_id_priv->id.state) { 2497 case IB_CM_REQ_SENT: 2498 case IB_CM_MRA_REQ_RCVD: 2499 break; 2500 default: 2501 ret = -EINVAL; 2502 trace_icm_rep_unknown_err( 2503 IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg), 2504 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg), 2505 cm_id_priv->id.state); 2506 spin_unlock_irq(&cm_id_priv->lock); 2507 goto error; 2508 } 2509 2510 cm_id_priv->timewait_info->work.remote_id = 2511 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)); 2512 cm_id_priv->timewait_info->remote_ca_guid = 2513 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg)); 2514 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2515 2516 spin_lock(&cm.lock); 2517 /* Check for duplicate REP. */ 2518 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 2519 spin_unlock(&cm.lock); 2520 spin_unlock_irq(&cm_id_priv->lock); 2521 ret = -EINVAL; 2522 trace_icm_insert_failed_err( 2523 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2524 goto error; 2525 } 2526 /* Check for a stale connection. */ 2527 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 2528 if (timewait_info) { 2529 cm_remove_remote(cm_id_priv); 2530 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2531 timewait_info->work.remote_id); 2532 2533 spin_unlock(&cm.lock); 2534 spin_unlock_irq(&cm_id_priv->lock); 2535 cm_issue_rej(work->port, work->mad_recv_wc, 2536 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 2537 NULL, 0); 2538 ret = -EINVAL; 2539 trace_icm_staleconn_err( 2540 IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg), 2541 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2542 2543 if (cur_cm_id_priv) { 2544 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0); 2545 cm_deref_id(cur_cm_id_priv); 2546 } 2547 2548 goto error; 2549 } 2550 spin_unlock(&cm.lock); 2551 2552 cm_id_priv->id.state = IB_CM_REP_RCVD; 2553 cm_id_priv->id.remote_id = 2554 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)); 2555 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2556 cm_id_priv->initiator_depth = 2557 IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg); 2558 cm_id_priv->responder_resources = 2559 IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg); 2560 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg)); 2561 cm_id_priv->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg); 2562 cm_id_priv->target_ack_delay = 2563 IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg); 2564 cm_id_priv->av.timeout = 2565 cm_ack_timeout(cm_id_priv->target_ack_delay, 2566 cm_id_priv->av.timeout - 1); 2567 cm_id_priv->alt_av.timeout = 2568 cm_ack_timeout(cm_id_priv->target_ack_delay, 2569 cm_id_priv->alt_av.timeout - 1); 2570 2571 ib_cancel_mad(cm_id_priv->msg); 2572 cm_queue_work_unlock(cm_id_priv, work); 2573 return 0; 2574 2575 error: 2576 cm_deref_id(cm_id_priv); 2577 return ret; 2578 } 2579 2580 static int cm_establish_handler(struct cm_work *work) 2581 { 2582 struct cm_id_private *cm_id_priv; 2583 2584 /* See comment in cm_establish about lookup. */ 2585 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 2586 if (!cm_id_priv) 2587 return -EINVAL; 2588 2589 spin_lock_irq(&cm_id_priv->lock); 2590 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 2591 spin_unlock_irq(&cm_id_priv->lock); 2592 goto out; 2593 } 2594 2595 ib_cancel_mad(cm_id_priv->msg); 2596 cm_queue_work_unlock(cm_id_priv, work); 2597 return 0; 2598 out: 2599 cm_deref_id(cm_id_priv); 2600 return -EINVAL; 2601 } 2602 2603 static int cm_rtu_handler(struct cm_work *work) 2604 { 2605 struct cm_id_private *cm_id_priv; 2606 struct cm_rtu_msg *rtu_msg; 2607 2608 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 2609 cm_id_priv = cm_acquire_id( 2610 cpu_to_be32(IBA_GET(CM_RTU_REMOTE_COMM_ID, rtu_msg)), 2611 cpu_to_be32(IBA_GET(CM_RTU_LOCAL_COMM_ID, rtu_msg))); 2612 if (!cm_id_priv) 2613 return -EINVAL; 2614 2615 work->cm_event.private_data = 2616 IBA_GET_MEM_PTR(CM_RTU_PRIVATE_DATA, rtu_msg); 2617 2618 spin_lock_irq(&cm_id_priv->lock); 2619 if (cm_id_priv->id.state != IB_CM_REP_SENT && 2620 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 2621 spin_unlock_irq(&cm_id_priv->lock); 2622 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 2623 [CM_RTU_COUNTER]); 2624 goto out; 2625 } 2626 cm_id_priv->id.state = IB_CM_ESTABLISHED; 2627 2628 ib_cancel_mad(cm_id_priv->msg); 2629 cm_queue_work_unlock(cm_id_priv, work); 2630 return 0; 2631 out: 2632 cm_deref_id(cm_id_priv); 2633 return -EINVAL; 2634 } 2635 2636 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 2637 struct cm_id_private *cm_id_priv, 2638 const void *private_data, 2639 u8 private_data_len) 2640 { 2641 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 2642 cm_form_tid(cm_id_priv)); 2643 IBA_SET(CM_DREQ_LOCAL_COMM_ID, dreq_msg, 2644 be32_to_cpu(cm_id_priv->id.local_id)); 2645 IBA_SET(CM_DREQ_REMOTE_COMM_ID, dreq_msg, 2646 be32_to_cpu(cm_id_priv->id.remote_id)); 2647 IBA_SET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg, 2648 be32_to_cpu(cm_id_priv->remote_qpn)); 2649 2650 if (private_data && private_data_len) 2651 IBA_SET_MEM(CM_DREQ_PRIVATE_DATA, dreq_msg, private_data, 2652 private_data_len); 2653 } 2654 2655 static void cm_issue_dreq(struct cm_id_private *cm_id_priv) 2656 { 2657 struct ib_mad_send_buf *msg; 2658 int ret; 2659 2660 lockdep_assert_held(&cm_id_priv->lock); 2661 2662 msg = cm_alloc_msg(cm_id_priv); 2663 if (IS_ERR(msg)) 2664 return; 2665 2666 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, NULL, 0); 2667 2668 trace_icm_send_dreq(&cm_id_priv->id); 2669 ret = ib_post_send_mad(msg, NULL); 2670 if (ret) 2671 cm_free_msg(msg); 2672 } 2673 2674 int ib_send_cm_dreq(struct ib_cm_id *cm_id, const void *private_data, 2675 u8 private_data_len) 2676 { 2677 struct cm_id_private *cm_id_priv = 2678 container_of(cm_id, struct cm_id_private, id); 2679 struct ib_mad_send_buf *msg; 2680 unsigned long flags; 2681 int ret; 2682 2683 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 2684 return -EINVAL; 2685 2686 spin_lock_irqsave(&cm_id_priv->lock, flags); 2687 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 2688 trace_icm_dreq_skipped(&cm_id_priv->id); 2689 ret = -EINVAL; 2690 goto unlock; 2691 } 2692 2693 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2694 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2695 ib_cancel_mad(cm_id_priv->msg); 2696 2697 msg = cm_alloc_priv_msg(cm_id_priv, IB_CM_DREQ_SENT); 2698 if (IS_ERR(msg)) { 2699 cm_enter_timewait(cm_id_priv); 2700 ret = PTR_ERR(msg); 2701 goto unlock; 2702 } 2703 2704 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 2705 private_data, private_data_len); 2706 2707 trace_icm_send_dreq(&cm_id_priv->id); 2708 ret = ib_post_send_mad(msg, NULL); 2709 if (ret) { 2710 cm_enter_timewait(cm_id_priv); 2711 cm_free_priv_msg(msg); 2712 goto unlock; 2713 } 2714 2715 cm_id_priv->id.state = IB_CM_DREQ_SENT; 2716 unlock: 2717 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2718 return ret; 2719 } 2720 EXPORT_SYMBOL(ib_send_cm_dreq); 2721 2722 static void cm_format_drep(struct cm_drep_msg *drep_msg, 2723 struct cm_id_private *cm_id_priv, 2724 const void *private_data, 2725 u8 private_data_len) 2726 { 2727 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2728 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg, 2729 be32_to_cpu(cm_id_priv->id.local_id)); 2730 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg, 2731 be32_to_cpu(cm_id_priv->id.remote_id)); 2732 2733 if (private_data && private_data_len) 2734 IBA_SET_MEM(CM_DREP_PRIVATE_DATA, drep_msg, private_data, 2735 private_data_len); 2736 } 2737 2738 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv, 2739 void *private_data, u8 private_data_len) 2740 { 2741 struct ib_mad_send_buf *msg; 2742 int ret; 2743 2744 lockdep_assert_held(&cm_id_priv->lock); 2745 2746 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2747 return -EINVAL; 2748 2749 if (cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2750 trace_icm_send_drep_err(&cm_id_priv->id); 2751 kfree(private_data); 2752 return -EINVAL; 2753 } 2754 2755 cm_set_private_data(cm_id_priv, private_data, private_data_len); 2756 cm_enter_timewait(cm_id_priv); 2757 2758 msg = cm_alloc_msg(cm_id_priv); 2759 if (IS_ERR(msg)) 2760 return PTR_ERR(msg); 2761 2762 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2763 private_data, private_data_len); 2764 2765 trace_icm_send_drep(&cm_id_priv->id); 2766 ret = ib_post_send_mad(msg, NULL); 2767 if (ret) { 2768 cm_free_msg(msg); 2769 return ret; 2770 } 2771 return 0; 2772 } 2773 2774 int ib_send_cm_drep(struct ib_cm_id *cm_id, const void *private_data, 2775 u8 private_data_len) 2776 { 2777 struct cm_id_private *cm_id_priv = 2778 container_of(cm_id, struct cm_id_private, id); 2779 unsigned long flags; 2780 void *data; 2781 int ret; 2782 2783 data = cm_copy_private_data(private_data, private_data_len); 2784 if (IS_ERR(data)) 2785 return PTR_ERR(data); 2786 2787 spin_lock_irqsave(&cm_id_priv->lock, flags); 2788 ret = cm_send_drep_locked(cm_id_priv, data, private_data_len); 2789 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2790 return ret; 2791 } 2792 EXPORT_SYMBOL(ib_send_cm_drep); 2793 2794 static int cm_issue_drep(struct cm_port *port, 2795 struct ib_mad_recv_wc *mad_recv_wc) 2796 { 2797 struct ib_mad_send_buf *msg = NULL; 2798 struct cm_dreq_msg *dreq_msg; 2799 struct cm_drep_msg *drep_msg; 2800 int ret; 2801 2802 ret = cm_alloc_response_msg(port, mad_recv_wc, true, &msg); 2803 if (ret) 2804 return ret; 2805 2806 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2807 drep_msg = (struct cm_drep_msg *) msg->mad; 2808 2809 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2810 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg, 2811 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg)); 2812 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg, 2813 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)); 2814 2815 trace_icm_issue_drep( 2816 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg), 2817 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)); 2818 ret = ib_post_send_mad(msg, NULL); 2819 if (ret) 2820 cm_free_msg(msg); 2821 2822 return ret; 2823 } 2824 2825 static int cm_dreq_handler(struct cm_work *work) 2826 { 2827 struct cm_id_private *cm_id_priv; 2828 struct cm_dreq_msg *dreq_msg; 2829 struct ib_mad_send_buf *msg = NULL; 2830 2831 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2832 cm_id_priv = cm_acquire_id( 2833 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)), 2834 cpu_to_be32(IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg))); 2835 if (!cm_id_priv) { 2836 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 2837 [CM_DREQ_COUNTER]); 2838 cm_issue_drep(work->port, work->mad_recv_wc); 2839 trace_icm_no_priv_err( 2840 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg), 2841 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)); 2842 return -EINVAL; 2843 } 2844 2845 work->cm_event.private_data = 2846 IBA_GET_MEM_PTR(CM_DREQ_PRIVATE_DATA, dreq_msg); 2847 2848 spin_lock_irq(&cm_id_priv->lock); 2849 if (cm_id_priv->local_qpn != 2850 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg))) 2851 goto unlock; 2852 2853 switch (cm_id_priv->id.state) { 2854 case IB_CM_REP_SENT: 2855 case IB_CM_DREQ_SENT: 2856 case IB_CM_MRA_REP_RCVD: 2857 ib_cancel_mad(cm_id_priv->msg); 2858 break; 2859 case IB_CM_ESTABLISHED: 2860 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2861 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2862 ib_cancel_mad(cm_id_priv->msg); 2863 break; 2864 case IB_CM_TIMEWAIT: 2865 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 2866 [CM_DREQ_COUNTER]); 2867 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc, 2868 true); 2869 if (IS_ERR(msg)) 2870 goto unlock; 2871 2872 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2873 cm_id_priv->private_data, 2874 cm_id_priv->private_data_len); 2875 spin_unlock_irq(&cm_id_priv->lock); 2876 2877 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || 2878 ib_post_send_mad(msg, NULL)) 2879 cm_free_msg(msg); 2880 goto deref; 2881 case IB_CM_DREQ_RCVD: 2882 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 2883 [CM_DREQ_COUNTER]); 2884 goto unlock; 2885 default: 2886 trace_icm_dreq_unknown_err(&cm_id_priv->id); 2887 goto unlock; 2888 } 2889 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2890 cm_id_priv->tid = dreq_msg->hdr.tid; 2891 cm_queue_work_unlock(cm_id_priv, work); 2892 return 0; 2893 2894 unlock: spin_unlock_irq(&cm_id_priv->lock); 2895 deref: cm_deref_id(cm_id_priv); 2896 return -EINVAL; 2897 } 2898 2899 static int cm_drep_handler(struct cm_work *work) 2900 { 2901 struct cm_id_private *cm_id_priv; 2902 struct cm_drep_msg *drep_msg; 2903 2904 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2905 cm_id_priv = cm_acquire_id( 2906 cpu_to_be32(IBA_GET(CM_DREP_REMOTE_COMM_ID, drep_msg)), 2907 cpu_to_be32(IBA_GET(CM_DREP_LOCAL_COMM_ID, drep_msg))); 2908 if (!cm_id_priv) 2909 return -EINVAL; 2910 2911 work->cm_event.private_data = 2912 IBA_GET_MEM_PTR(CM_DREP_PRIVATE_DATA, drep_msg); 2913 2914 spin_lock_irq(&cm_id_priv->lock); 2915 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2916 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2917 spin_unlock_irq(&cm_id_priv->lock); 2918 goto out; 2919 } 2920 cm_enter_timewait(cm_id_priv); 2921 2922 ib_cancel_mad(cm_id_priv->msg); 2923 cm_queue_work_unlock(cm_id_priv, work); 2924 return 0; 2925 out: 2926 cm_deref_id(cm_id_priv); 2927 return -EINVAL; 2928 } 2929 2930 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv, 2931 enum ib_cm_rej_reason reason, void *ari, 2932 u8 ari_length, const void *private_data, 2933 u8 private_data_len) 2934 { 2935 enum ib_cm_state state = cm_id_priv->id.state; 2936 struct ib_mad_send_buf *msg; 2937 int ret; 2938 2939 lockdep_assert_held(&cm_id_priv->lock); 2940 2941 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2942 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2943 return -EINVAL; 2944 2945 trace_icm_send_rej(&cm_id_priv->id, reason); 2946 2947 switch (state) { 2948 case IB_CM_REQ_SENT: 2949 case IB_CM_MRA_REQ_RCVD: 2950 case IB_CM_REQ_RCVD: 2951 case IB_CM_MRA_REQ_SENT: 2952 case IB_CM_REP_RCVD: 2953 case IB_CM_MRA_REP_SENT: 2954 cm_reset_to_idle(cm_id_priv); 2955 msg = cm_alloc_msg(cm_id_priv); 2956 if (IS_ERR(msg)) 2957 return PTR_ERR(msg); 2958 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason, 2959 ari, ari_length, private_data, private_data_len, 2960 state); 2961 break; 2962 case IB_CM_REP_SENT: 2963 case IB_CM_MRA_REP_RCVD: 2964 cm_enter_timewait(cm_id_priv); 2965 msg = cm_alloc_msg(cm_id_priv); 2966 if (IS_ERR(msg)) 2967 return PTR_ERR(msg); 2968 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason, 2969 ari, ari_length, private_data, private_data_len, 2970 state); 2971 break; 2972 default: 2973 trace_icm_send_unknown_rej_err(&cm_id_priv->id); 2974 return -EINVAL; 2975 } 2976 2977 ret = ib_post_send_mad(msg, NULL); 2978 if (ret) { 2979 cm_free_msg(msg); 2980 return ret; 2981 } 2982 2983 return 0; 2984 } 2985 2986 int ib_send_cm_rej(struct ib_cm_id *cm_id, enum ib_cm_rej_reason reason, 2987 void *ari, u8 ari_length, const void *private_data, 2988 u8 private_data_len) 2989 { 2990 struct cm_id_private *cm_id_priv = 2991 container_of(cm_id, struct cm_id_private, id); 2992 unsigned long flags; 2993 int ret; 2994 2995 spin_lock_irqsave(&cm_id_priv->lock, flags); 2996 ret = cm_send_rej_locked(cm_id_priv, reason, ari, ari_length, 2997 private_data, private_data_len); 2998 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2999 return ret; 3000 } 3001 EXPORT_SYMBOL(ib_send_cm_rej); 3002 3003 static void cm_format_rej_event(struct cm_work *work) 3004 { 3005 struct cm_rej_msg *rej_msg; 3006 struct ib_cm_rej_event_param *param; 3007 3008 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 3009 param = &work->cm_event.param.rej_rcvd; 3010 param->ari = IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg); 3011 param->ari_length = IBA_GET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg); 3012 param->reason = IBA_GET(CM_REJ_REASON, rej_msg); 3013 work->cm_event.private_data = 3014 IBA_GET_MEM_PTR(CM_REJ_PRIVATE_DATA, rej_msg); 3015 } 3016 3017 static struct cm_id_private *cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 3018 { 3019 struct cm_id_private *cm_id_priv; 3020 __be32 remote_id; 3021 3022 remote_id = cpu_to_be32(IBA_GET(CM_REJ_LOCAL_COMM_ID, rej_msg)); 3023 3024 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_TIMEOUT) { 3025 cm_id_priv = cm_find_remote_id( 3026 *((__be64 *)IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg)), 3027 remote_id); 3028 } else if (IBA_GET(CM_REJ_MESSAGE_REJECTED, rej_msg) == 3029 CM_MSG_RESPONSE_REQ) 3030 cm_id_priv = cm_acquire_id( 3031 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)), 3032 0); 3033 else 3034 cm_id_priv = cm_acquire_id( 3035 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)), 3036 remote_id); 3037 3038 return cm_id_priv; 3039 } 3040 3041 static int cm_rej_handler(struct cm_work *work) 3042 { 3043 struct cm_id_private *cm_id_priv; 3044 struct cm_rej_msg *rej_msg; 3045 3046 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 3047 cm_id_priv = cm_acquire_rejected_id(rej_msg); 3048 if (!cm_id_priv) 3049 return -EINVAL; 3050 3051 cm_format_rej_event(work); 3052 3053 spin_lock_irq(&cm_id_priv->lock); 3054 switch (cm_id_priv->id.state) { 3055 case IB_CM_REQ_SENT: 3056 case IB_CM_MRA_REQ_RCVD: 3057 case IB_CM_REP_SENT: 3058 case IB_CM_MRA_REP_RCVD: 3059 ib_cancel_mad(cm_id_priv->msg); 3060 fallthrough; 3061 case IB_CM_REQ_RCVD: 3062 case IB_CM_MRA_REQ_SENT: 3063 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_STALE_CONN) 3064 cm_enter_timewait(cm_id_priv); 3065 else 3066 cm_reset_to_idle(cm_id_priv); 3067 break; 3068 case IB_CM_DREQ_SENT: 3069 ib_cancel_mad(cm_id_priv->msg); 3070 fallthrough; 3071 case IB_CM_REP_RCVD: 3072 case IB_CM_MRA_REP_SENT: 3073 cm_enter_timewait(cm_id_priv); 3074 break; 3075 case IB_CM_ESTABLISHED: 3076 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT || 3077 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) { 3078 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT) 3079 ib_cancel_mad(cm_id_priv->msg); 3080 cm_enter_timewait(cm_id_priv); 3081 break; 3082 } 3083 fallthrough; 3084 default: 3085 trace_icm_rej_unknown_err(&cm_id_priv->id); 3086 spin_unlock_irq(&cm_id_priv->lock); 3087 goto out; 3088 } 3089 3090 cm_queue_work_unlock(cm_id_priv, work); 3091 return 0; 3092 out: 3093 cm_deref_id(cm_id_priv); 3094 return -EINVAL; 3095 } 3096 3097 int ib_prepare_cm_mra(struct ib_cm_id *cm_id) 3098 { 3099 struct cm_id_private *cm_id_priv; 3100 enum ib_cm_state cm_state; 3101 enum ib_cm_lap_state lap_state; 3102 unsigned long flags; 3103 int ret = 0; 3104 3105 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3106 3107 spin_lock_irqsave(&cm_id_priv->lock, flags); 3108 switch (cm_id_priv->id.state) { 3109 case IB_CM_REQ_RCVD: 3110 cm_state = IB_CM_MRA_REQ_SENT; 3111 lap_state = cm_id->lap_state; 3112 break; 3113 case IB_CM_REP_RCVD: 3114 cm_state = IB_CM_MRA_REP_SENT; 3115 lap_state = cm_id->lap_state; 3116 break; 3117 case IB_CM_ESTABLISHED: 3118 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 3119 cm_state = cm_id->state; 3120 lap_state = IB_CM_MRA_LAP_SENT; 3121 break; 3122 } 3123 fallthrough; 3124 default: 3125 trace_icm_prepare_mra_unknown_err(&cm_id_priv->id); 3126 ret = -EINVAL; 3127 goto error_unlock; 3128 } 3129 3130 cm_id->state = cm_state; 3131 cm_id->lap_state = lap_state; 3132 cm_set_private_data(cm_id_priv, NULL, 0); 3133 3134 error_unlock: 3135 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3136 return ret; 3137 } 3138 EXPORT_SYMBOL(ib_prepare_cm_mra); 3139 3140 static struct cm_id_private *cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 3141 { 3142 switch (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg)) { 3143 case CM_MSG_RESPONSE_REQ: 3144 return cm_acquire_id( 3145 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)), 3146 0); 3147 case CM_MSG_RESPONSE_REP: 3148 case CM_MSG_RESPONSE_OTHER: 3149 return cm_acquire_id( 3150 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)), 3151 cpu_to_be32(IBA_GET(CM_MRA_LOCAL_COMM_ID, mra_msg))); 3152 default: 3153 return NULL; 3154 } 3155 } 3156 3157 static int cm_mra_handler(struct cm_work *work) 3158 { 3159 struct cm_id_private *cm_id_priv; 3160 struct cm_mra_msg *mra_msg; 3161 int timeout; 3162 3163 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 3164 cm_id_priv = cm_acquire_mraed_id(mra_msg); 3165 if (!cm_id_priv) 3166 return -EINVAL; 3167 3168 work->cm_event.private_data = 3169 IBA_GET_MEM_PTR(CM_MRA_PRIVATE_DATA, mra_msg); 3170 work->cm_event.param.mra_rcvd.service_timeout = 3171 IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg); 3172 timeout = cm_convert_to_ms(IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg)) + 3173 cm_convert_to_ms(cm_id_priv->av.timeout); 3174 3175 spin_lock_irq(&cm_id_priv->lock); 3176 switch (cm_id_priv->id.state) { 3177 case IB_CM_REQ_SENT: 3178 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != 3179 CM_MSG_RESPONSE_REQ || 3180 ib_modify_mad(cm_id_priv->msg, timeout)) 3181 goto out; 3182 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 3183 break; 3184 case IB_CM_REP_SENT: 3185 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != 3186 CM_MSG_RESPONSE_REP || 3187 ib_modify_mad(cm_id_priv->msg, timeout)) 3188 goto out; 3189 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 3190 break; 3191 case IB_CM_ESTABLISHED: 3192 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != 3193 CM_MSG_RESPONSE_OTHER || 3194 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 3195 ib_modify_mad(cm_id_priv->msg, timeout)) { 3196 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 3197 atomic_long_inc( 3198 &work->port->counters[CM_RECV_DUPLICATES] 3199 [CM_MRA_COUNTER]); 3200 goto out; 3201 } 3202 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 3203 break; 3204 case IB_CM_MRA_REQ_RCVD: 3205 case IB_CM_MRA_REP_RCVD: 3206 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 3207 [CM_MRA_COUNTER]); 3208 fallthrough; 3209 default: 3210 trace_icm_mra_unknown_err(&cm_id_priv->id); 3211 goto out; 3212 } 3213 3214 cm_id_priv->msg->context[1] = (void *) (unsigned long) 3215 cm_id_priv->id.state; 3216 cm_queue_work_unlock(cm_id_priv, work); 3217 return 0; 3218 out: 3219 spin_unlock_irq(&cm_id_priv->lock); 3220 cm_deref_id(cm_id_priv); 3221 return -EINVAL; 3222 } 3223 3224 static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg, 3225 struct sa_path_rec *path) 3226 { 3227 u32 lid; 3228 3229 if (path->rec_type != SA_PATH_REC_TYPE_OPA) { 3230 sa_path_set_dlid(path, IBA_GET(CM_LAP_ALTERNATE_LOCAL_PORT_LID, 3231 lap_msg)); 3232 sa_path_set_slid(path, IBA_GET(CM_LAP_ALTERNATE_REMOTE_PORT_LID, 3233 lap_msg)); 3234 } else { 3235 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 3236 CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg)); 3237 sa_path_set_dlid(path, lid); 3238 3239 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 3240 CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg)); 3241 sa_path_set_slid(path, lid); 3242 } 3243 } 3244 3245 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 3246 struct sa_path_rec *path, 3247 struct cm_lap_msg *lap_msg) 3248 { 3249 path->dgid = *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg); 3250 path->sgid = 3251 *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg); 3252 path->flow_label = 3253 cpu_to_be32(IBA_GET(CM_LAP_ALTERNATE_FLOW_LABEL, lap_msg)); 3254 path->hop_limit = IBA_GET(CM_LAP_ALTERNATE_HOP_LIMIT, lap_msg); 3255 path->traffic_class = IBA_GET(CM_LAP_ALTERNATE_TRAFFIC_CLASS, lap_msg); 3256 path->reversible = 1; 3257 path->pkey = cm_id_priv->pkey; 3258 path->sl = IBA_GET(CM_LAP_ALTERNATE_SL, lap_msg); 3259 path->mtu_selector = IB_SA_EQ; 3260 path->mtu = cm_id_priv->path_mtu; 3261 path->rate_selector = IB_SA_EQ; 3262 path->rate = IBA_GET(CM_LAP_ALTERNATE_PACKET_RATE, lap_msg); 3263 path->packet_life_time_selector = IB_SA_EQ; 3264 path->packet_life_time = 3265 IBA_GET(CM_LAP_ALTERNATE_LOCAL_ACK_TIMEOUT, lap_msg); 3266 path->packet_life_time -= (path->packet_life_time > 0); 3267 cm_format_path_lid_from_lap(lap_msg, path); 3268 } 3269 3270 static int cm_lap_handler(struct cm_work *work) 3271 { 3272 struct cm_id_private *cm_id_priv; 3273 struct cm_lap_msg *lap_msg; 3274 struct ib_cm_lap_event_param *param; 3275 struct ib_mad_send_buf *msg = NULL; 3276 struct rdma_ah_attr ah_attr; 3277 struct cm_av alt_av = {}; 3278 int ret; 3279 3280 /* Currently Alternate path messages are not supported for 3281 * RoCE link layer. 3282 */ 3283 if (rdma_protocol_roce(work->port->cm_dev->ib_device, 3284 work->port->port_num)) 3285 return -EINVAL; 3286 3287 /* todo: verify LAP request and send reject APR if invalid. */ 3288 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 3289 cm_id_priv = cm_acquire_id( 3290 cpu_to_be32(IBA_GET(CM_LAP_REMOTE_COMM_ID, lap_msg)), 3291 cpu_to_be32(IBA_GET(CM_LAP_LOCAL_COMM_ID, lap_msg))); 3292 if (!cm_id_priv) 3293 return -EINVAL; 3294 3295 param = &work->cm_event.param.lap_rcvd; 3296 memset(&work->path[0], 0, sizeof(work->path[1])); 3297 cm_path_set_rec_type(work->port->cm_dev->ib_device, 3298 work->port->port_num, &work->path[0], 3299 IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, 3300 lap_msg)); 3301 param->alternate_path = &work->path[0]; 3302 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 3303 work->cm_event.private_data = 3304 IBA_GET_MEM_PTR(CM_LAP_PRIVATE_DATA, lap_msg); 3305 3306 ret = ib_init_ah_attr_from_wc(work->port->cm_dev->ib_device, 3307 work->port->port_num, 3308 work->mad_recv_wc->wc, 3309 work->mad_recv_wc->recv_buf.grh, 3310 &ah_attr); 3311 if (ret) 3312 goto deref; 3313 3314 ret = cm_init_av_by_path(param->alternate_path, NULL, &alt_av); 3315 if (ret) { 3316 rdma_destroy_ah_attr(&ah_attr); 3317 goto deref; 3318 } 3319 3320 spin_lock_irq(&cm_id_priv->lock); 3321 cm_init_av_for_lap(work->port, work->mad_recv_wc->wc, 3322 &ah_attr, &cm_id_priv->av); 3323 cm_move_av_from_path(&cm_id_priv->alt_av, &alt_av); 3324 3325 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 3326 goto unlock; 3327 3328 switch (cm_id_priv->id.lap_state) { 3329 case IB_CM_LAP_UNINIT: 3330 case IB_CM_LAP_IDLE: 3331 break; 3332 case IB_CM_MRA_LAP_SENT: 3333 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 3334 [CM_LAP_COUNTER]); 3335 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc, 3336 true); 3337 if (IS_ERR(msg)) 3338 goto unlock; 3339 3340 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 3341 CM_MSG_RESPONSE_OTHER, 3342 cm_id_priv->private_data, 3343 cm_id_priv->private_data_len); 3344 spin_unlock_irq(&cm_id_priv->lock); 3345 3346 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || 3347 ib_post_send_mad(msg, NULL)) 3348 cm_free_msg(msg); 3349 goto deref; 3350 case IB_CM_LAP_RCVD: 3351 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 3352 [CM_LAP_COUNTER]); 3353 goto unlock; 3354 default: 3355 goto unlock; 3356 } 3357 3358 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 3359 cm_id_priv->tid = lap_msg->hdr.tid; 3360 cm_queue_work_unlock(cm_id_priv, work); 3361 return 0; 3362 3363 unlock: spin_unlock_irq(&cm_id_priv->lock); 3364 deref: cm_deref_id(cm_id_priv); 3365 return -EINVAL; 3366 } 3367 3368 static int cm_apr_handler(struct cm_work *work) 3369 { 3370 struct cm_id_private *cm_id_priv; 3371 struct cm_apr_msg *apr_msg; 3372 3373 /* Currently Alternate path messages are not supported for 3374 * RoCE link layer. 3375 */ 3376 if (rdma_protocol_roce(work->port->cm_dev->ib_device, 3377 work->port->port_num)) 3378 return -EINVAL; 3379 3380 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 3381 cm_id_priv = cm_acquire_id( 3382 cpu_to_be32(IBA_GET(CM_APR_REMOTE_COMM_ID, apr_msg)), 3383 cpu_to_be32(IBA_GET(CM_APR_LOCAL_COMM_ID, apr_msg))); 3384 if (!cm_id_priv) 3385 return -EINVAL; /* Unmatched reply. */ 3386 3387 work->cm_event.param.apr_rcvd.ap_status = 3388 IBA_GET(CM_APR_AR_STATUS, apr_msg); 3389 work->cm_event.param.apr_rcvd.apr_info = 3390 IBA_GET_MEM_PTR(CM_APR_ADDITIONAL_INFORMATION, apr_msg); 3391 work->cm_event.param.apr_rcvd.info_len = 3392 IBA_GET(CM_APR_ADDITIONAL_INFORMATION_LENGTH, apr_msg); 3393 work->cm_event.private_data = 3394 IBA_GET_MEM_PTR(CM_APR_PRIVATE_DATA, apr_msg); 3395 3396 spin_lock_irq(&cm_id_priv->lock); 3397 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 3398 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 3399 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 3400 spin_unlock_irq(&cm_id_priv->lock); 3401 goto out; 3402 } 3403 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 3404 ib_cancel_mad(cm_id_priv->msg); 3405 cm_queue_work_unlock(cm_id_priv, work); 3406 return 0; 3407 out: 3408 cm_deref_id(cm_id_priv); 3409 return -EINVAL; 3410 } 3411 3412 static int cm_timewait_handler(struct cm_work *work) 3413 { 3414 struct cm_timewait_info *timewait_info; 3415 struct cm_id_private *cm_id_priv; 3416 3417 timewait_info = container_of(work, struct cm_timewait_info, work); 3418 spin_lock_irq(&cm.lock); 3419 list_del(&timewait_info->list); 3420 spin_unlock_irq(&cm.lock); 3421 3422 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 3423 timewait_info->work.remote_id); 3424 if (!cm_id_priv) 3425 return -EINVAL; 3426 3427 spin_lock_irq(&cm_id_priv->lock); 3428 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 3429 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 3430 spin_unlock_irq(&cm_id_priv->lock); 3431 goto out; 3432 } 3433 cm_id_priv->id.state = IB_CM_IDLE; 3434 cm_queue_work_unlock(cm_id_priv, work); 3435 return 0; 3436 out: 3437 cm_deref_id(cm_id_priv); 3438 return -EINVAL; 3439 } 3440 3441 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 3442 struct cm_id_private *cm_id_priv, 3443 struct ib_cm_sidr_req_param *param) 3444 { 3445 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 3446 cm_form_tid(cm_id_priv)); 3447 IBA_SET(CM_SIDR_REQ_REQUESTID, sidr_req_msg, 3448 be32_to_cpu(cm_id_priv->id.local_id)); 3449 IBA_SET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg, 3450 be16_to_cpu(param->path->pkey)); 3451 IBA_SET(CM_SIDR_REQ_SERVICEID, sidr_req_msg, 3452 be64_to_cpu(param->service_id)); 3453 3454 if (param->private_data && param->private_data_len) 3455 IBA_SET_MEM(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg, 3456 param->private_data, param->private_data_len); 3457 } 3458 3459 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 3460 struct ib_cm_sidr_req_param *param) 3461 { 3462 struct cm_id_private *cm_id_priv; 3463 struct ib_mad_send_buf *msg; 3464 struct cm_av av = {}; 3465 unsigned long flags; 3466 int ret; 3467 3468 if (!param->path || (param->private_data && 3469 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 3470 return -EINVAL; 3471 3472 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3473 ret = cm_init_av_by_path(param->path, param->sgid_attr, &av); 3474 if (ret) 3475 return ret; 3476 3477 spin_lock_irqsave(&cm_id_priv->lock, flags); 3478 cm_move_av_from_path(&cm_id_priv->av, &av); 3479 cm_id->service_id = param->service_id; 3480 cm_id_priv->timeout_ms = param->timeout_ms; 3481 cm_id_priv->max_cm_retries = param->max_cm_retries; 3482 if (cm_id->state != IB_CM_IDLE) { 3483 ret = -EINVAL; 3484 goto out_unlock; 3485 } 3486 3487 msg = cm_alloc_priv_msg(cm_id_priv, IB_CM_SIDR_REQ_SENT); 3488 if (IS_ERR(msg)) { 3489 ret = PTR_ERR(msg); 3490 goto out_unlock; 3491 } 3492 3493 cm_format_sidr_req((struct cm_sidr_req_msg *)msg->mad, cm_id_priv, 3494 param); 3495 3496 trace_icm_send_sidr_req(&cm_id_priv->id); 3497 ret = ib_post_send_mad(msg, NULL); 3498 if (ret) 3499 goto out_free; 3500 cm_id->state = IB_CM_SIDR_REQ_SENT; 3501 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3502 return 0; 3503 out_free: 3504 cm_free_priv_msg(msg); 3505 out_unlock: 3506 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3507 return ret; 3508 } 3509 EXPORT_SYMBOL(ib_send_cm_sidr_req); 3510 3511 static void cm_format_sidr_req_event(struct cm_work *work, 3512 const struct cm_id_private *rx_cm_id, 3513 struct ib_cm_id *listen_id) 3514 { 3515 struct cm_sidr_req_msg *sidr_req_msg; 3516 struct ib_cm_sidr_req_event_param *param; 3517 3518 sidr_req_msg = (struct cm_sidr_req_msg *) 3519 work->mad_recv_wc->recv_buf.mad; 3520 param = &work->cm_event.param.sidr_req_rcvd; 3521 param->pkey = IBA_GET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg); 3522 param->listen_id = listen_id; 3523 param->service_id = 3524 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg)); 3525 param->bth_pkey = cm_get_bth_pkey(work); 3526 param->port = work->port->port_num; 3527 param->sgid_attr = rx_cm_id->av.ah_attr.grh.sgid_attr; 3528 work->cm_event.private_data = 3529 IBA_GET_MEM_PTR(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg); 3530 } 3531 3532 static int cm_sidr_req_handler(struct cm_work *work) 3533 { 3534 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 3535 struct cm_sidr_req_msg *sidr_req_msg; 3536 struct ib_wc *wc; 3537 int ret; 3538 3539 cm_id_priv = 3540 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL); 3541 if (IS_ERR(cm_id_priv)) 3542 return PTR_ERR(cm_id_priv); 3543 3544 /* Record SGID/SLID and request ID for lookup. */ 3545 sidr_req_msg = (struct cm_sidr_req_msg *) 3546 work->mad_recv_wc->recv_buf.mad; 3547 3548 cm_id_priv->id.remote_id = 3549 cpu_to_be32(IBA_GET(CM_SIDR_REQ_REQUESTID, sidr_req_msg)); 3550 cm_id_priv->id.service_id = 3551 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg)); 3552 cm_id_priv->tid = sidr_req_msg->hdr.tid; 3553 3554 wc = work->mad_recv_wc->wc; 3555 cm_id_priv->sidr_slid = wc->slid; 3556 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 3557 work->mad_recv_wc->recv_buf.grh, 3558 &cm_id_priv->av); 3559 if (ret) 3560 goto out; 3561 3562 spin_lock_irq(&cm.lock); 3563 listen_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 3564 if (listen_cm_id_priv) { 3565 spin_unlock_irq(&cm.lock); 3566 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES] 3567 [CM_SIDR_REQ_COUNTER]); 3568 goto out; /* Duplicate message. */ 3569 } 3570 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3571 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 3572 cm_id_priv->id.service_id); 3573 if (!listen_cm_id_priv) { 3574 spin_unlock_irq(&cm.lock); 3575 ib_send_cm_sidr_rep(&cm_id_priv->id, 3576 &(struct ib_cm_sidr_rep_param){ 3577 .status = IB_SIDR_UNSUPPORTED }); 3578 goto out; /* No match. */ 3579 } 3580 spin_unlock_irq(&cm.lock); 3581 3582 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 3583 cm_id_priv->id.context = listen_cm_id_priv->id.context; 3584 3585 /* 3586 * A SIDR ID does not need to be in the xarray since it does not receive 3587 * mads, is not placed in the remote_id or remote_qpn rbtree, and does 3588 * not enter timewait. 3589 */ 3590 3591 cm_format_sidr_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 3592 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 3593 cm_free_work(work); 3594 /* 3595 * A pointer to the listen_cm_id is held in the event, so this deref 3596 * must be after the event is delivered above. 3597 */ 3598 cm_deref_id(listen_cm_id_priv); 3599 if (ret) 3600 cm_destroy_id(&cm_id_priv->id, ret); 3601 return 0; 3602 out: 3603 ib_destroy_cm_id(&cm_id_priv->id); 3604 return -EINVAL; 3605 } 3606 3607 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3608 struct cm_id_private *cm_id_priv, 3609 struct ib_cm_sidr_rep_param *param) 3610 { 3611 cm_format_mad_ece_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3612 cm_id_priv->tid, param->ece.attr_mod); 3613 IBA_SET(CM_SIDR_REP_REQUESTID, sidr_rep_msg, 3614 be32_to_cpu(cm_id_priv->id.remote_id)); 3615 IBA_SET(CM_SIDR_REP_STATUS, sidr_rep_msg, param->status); 3616 IBA_SET(CM_SIDR_REP_QPN, sidr_rep_msg, param->qp_num); 3617 IBA_SET(CM_SIDR_REP_SERVICEID, sidr_rep_msg, 3618 be64_to_cpu(cm_id_priv->id.service_id)); 3619 IBA_SET(CM_SIDR_REP_Q_KEY, sidr_rep_msg, param->qkey); 3620 IBA_SET(CM_SIDR_REP_VENDOR_ID_L, sidr_rep_msg, 3621 param->ece.vendor_id & 0xFF); 3622 IBA_SET(CM_SIDR_REP_VENDOR_ID_H, sidr_rep_msg, 3623 (param->ece.vendor_id >> 8) & 0xFF); 3624 3625 if (param->info && param->info_length) 3626 IBA_SET_MEM(CM_SIDR_REP_ADDITIONAL_INFORMATION, sidr_rep_msg, 3627 param->info, param->info_length); 3628 3629 if (param->private_data && param->private_data_len) 3630 IBA_SET_MEM(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg, 3631 param->private_data, param->private_data_len); 3632 } 3633 3634 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv, 3635 struct ib_cm_sidr_rep_param *param) 3636 { 3637 struct ib_mad_send_buf *msg; 3638 unsigned long flags; 3639 int ret; 3640 3641 lockdep_assert_held(&cm_id_priv->lock); 3642 3643 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3644 (param->private_data && 3645 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3646 return -EINVAL; 3647 3648 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_RCVD) 3649 return -EINVAL; 3650 3651 msg = cm_alloc_msg(cm_id_priv); 3652 if (IS_ERR(msg)) 3653 return PTR_ERR(msg); 3654 3655 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3656 param); 3657 trace_icm_send_sidr_rep(&cm_id_priv->id); 3658 ret = ib_post_send_mad(msg, NULL); 3659 if (ret) { 3660 cm_free_msg(msg); 3661 return ret; 3662 } 3663 cm_id_priv->id.state = IB_CM_IDLE; 3664 spin_lock_irqsave(&cm.lock, flags); 3665 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) { 3666 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3667 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); 3668 } 3669 spin_unlock_irqrestore(&cm.lock, flags); 3670 return 0; 3671 } 3672 3673 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3674 struct ib_cm_sidr_rep_param *param) 3675 { 3676 struct cm_id_private *cm_id_priv = 3677 container_of(cm_id, struct cm_id_private, id); 3678 unsigned long flags; 3679 int ret; 3680 3681 spin_lock_irqsave(&cm_id_priv->lock, flags); 3682 ret = cm_send_sidr_rep_locked(cm_id_priv, param); 3683 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3684 return ret; 3685 } 3686 EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3687 3688 static void cm_format_sidr_rep_event(struct cm_work *work, 3689 const struct cm_id_private *cm_id_priv) 3690 { 3691 struct cm_sidr_rep_msg *sidr_rep_msg; 3692 struct ib_cm_sidr_rep_event_param *param; 3693 3694 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3695 work->mad_recv_wc->recv_buf.mad; 3696 param = &work->cm_event.param.sidr_rep_rcvd; 3697 param->status = IBA_GET(CM_SIDR_REP_STATUS, sidr_rep_msg); 3698 param->qkey = IBA_GET(CM_SIDR_REP_Q_KEY, sidr_rep_msg); 3699 param->qpn = IBA_GET(CM_SIDR_REP_QPN, sidr_rep_msg); 3700 param->info = IBA_GET_MEM_PTR(CM_SIDR_REP_ADDITIONAL_INFORMATION, 3701 sidr_rep_msg); 3702 param->info_len = IBA_GET(CM_SIDR_REP_ADDITIONAL_INFORMATION_LENGTH, 3703 sidr_rep_msg); 3704 param->sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr; 3705 work->cm_event.private_data = 3706 IBA_GET_MEM_PTR(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg); 3707 } 3708 3709 static int cm_sidr_rep_handler(struct cm_work *work) 3710 { 3711 struct cm_sidr_rep_msg *sidr_rep_msg; 3712 struct cm_id_private *cm_id_priv; 3713 3714 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3715 work->mad_recv_wc->recv_buf.mad; 3716 cm_id_priv = cm_acquire_id( 3717 cpu_to_be32(IBA_GET(CM_SIDR_REP_REQUESTID, sidr_rep_msg)), 0); 3718 if (!cm_id_priv) 3719 return -EINVAL; /* Unmatched reply. */ 3720 3721 spin_lock_irq(&cm_id_priv->lock); 3722 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3723 spin_unlock_irq(&cm_id_priv->lock); 3724 goto out; 3725 } 3726 cm_id_priv->id.state = IB_CM_IDLE; 3727 ib_cancel_mad(cm_id_priv->msg); 3728 spin_unlock_irq(&cm_id_priv->lock); 3729 3730 cm_format_sidr_rep_event(work, cm_id_priv); 3731 cm_process_work(cm_id_priv, work); 3732 return 0; 3733 out: 3734 cm_deref_id(cm_id_priv); 3735 return -EINVAL; 3736 } 3737 3738 static void cm_process_send_error(struct cm_id_private *cm_id_priv, 3739 struct ib_mad_send_buf *msg, 3740 enum ib_wc_status wc_status) 3741 { 3742 enum ib_cm_state state = (unsigned long) msg->context[1]; 3743 struct ib_cm_event cm_event = {}; 3744 int ret; 3745 3746 /* Discard old sends. */ 3747 spin_lock_irq(&cm_id_priv->lock); 3748 if (msg != cm_id_priv->msg) { 3749 spin_unlock_irq(&cm_id_priv->lock); 3750 cm_free_msg(msg); 3751 cm_deref_id(cm_id_priv); 3752 return; 3753 } 3754 cm_free_priv_msg(msg); 3755 3756 if (state != cm_id_priv->id.state || wc_status == IB_WC_SUCCESS || 3757 wc_status == IB_WC_WR_FLUSH_ERR) 3758 goto out_unlock; 3759 3760 trace_icm_mad_send_err(state, wc_status); 3761 switch (state) { 3762 case IB_CM_REQ_SENT: 3763 case IB_CM_MRA_REQ_RCVD: 3764 cm_reset_to_idle(cm_id_priv); 3765 cm_event.event = IB_CM_REQ_ERROR; 3766 break; 3767 case IB_CM_REP_SENT: 3768 case IB_CM_MRA_REP_RCVD: 3769 cm_reset_to_idle(cm_id_priv); 3770 cm_event.event = IB_CM_REP_ERROR; 3771 break; 3772 case IB_CM_DREQ_SENT: 3773 cm_enter_timewait(cm_id_priv); 3774 cm_event.event = IB_CM_DREQ_ERROR; 3775 break; 3776 case IB_CM_SIDR_REQ_SENT: 3777 cm_id_priv->id.state = IB_CM_IDLE; 3778 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3779 break; 3780 default: 3781 goto out_unlock; 3782 } 3783 spin_unlock_irq(&cm_id_priv->lock); 3784 cm_event.param.send_status = wc_status; 3785 3786 /* No other events can occur on the cm_id at this point. */ 3787 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3788 if (ret) 3789 ib_destroy_cm_id(&cm_id_priv->id); 3790 return; 3791 out_unlock: 3792 spin_unlock_irq(&cm_id_priv->lock); 3793 } 3794 3795 static void cm_send_handler(struct ib_mad_agent *mad_agent, 3796 struct ib_mad_send_wc *mad_send_wc) 3797 { 3798 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3799 struct cm_id_private *cm_id_priv; 3800 struct cm_port *port; 3801 u16 attr_index; 3802 3803 port = mad_agent->context; 3804 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3805 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3806 3807 if (msg->context[0] == CM_DIRECT_RETRY_CTX) { 3808 msg->retries = 1; 3809 cm_id_priv = NULL; 3810 } else { 3811 cm_id_priv = msg->context[0]; 3812 } 3813 3814 atomic_long_add(1 + msg->retries, &port->counters[CM_XMIT][attr_index]); 3815 if (msg->retries) 3816 atomic_long_add(msg->retries, 3817 &port->counters[CM_XMIT_RETRIES][attr_index]); 3818 3819 if (cm_id_priv) 3820 cm_process_send_error(cm_id_priv, msg, mad_send_wc->status); 3821 else 3822 cm_free_msg(msg); 3823 } 3824 3825 static void cm_work_handler(struct work_struct *_work) 3826 { 3827 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3828 int ret; 3829 3830 switch (work->cm_event.event) { 3831 case IB_CM_REQ_RECEIVED: 3832 ret = cm_req_handler(work); 3833 break; 3834 case IB_CM_MRA_RECEIVED: 3835 ret = cm_mra_handler(work); 3836 break; 3837 case IB_CM_REJ_RECEIVED: 3838 ret = cm_rej_handler(work); 3839 break; 3840 case IB_CM_REP_RECEIVED: 3841 ret = cm_rep_handler(work); 3842 break; 3843 case IB_CM_RTU_RECEIVED: 3844 ret = cm_rtu_handler(work); 3845 break; 3846 case IB_CM_USER_ESTABLISHED: 3847 ret = cm_establish_handler(work); 3848 break; 3849 case IB_CM_DREQ_RECEIVED: 3850 ret = cm_dreq_handler(work); 3851 break; 3852 case IB_CM_DREP_RECEIVED: 3853 ret = cm_drep_handler(work); 3854 break; 3855 case IB_CM_SIDR_REQ_RECEIVED: 3856 ret = cm_sidr_req_handler(work); 3857 break; 3858 case IB_CM_SIDR_REP_RECEIVED: 3859 ret = cm_sidr_rep_handler(work); 3860 break; 3861 case IB_CM_LAP_RECEIVED: 3862 ret = cm_lap_handler(work); 3863 break; 3864 case IB_CM_APR_RECEIVED: 3865 ret = cm_apr_handler(work); 3866 break; 3867 case IB_CM_TIMEWAIT_EXIT: 3868 ret = cm_timewait_handler(work); 3869 break; 3870 default: 3871 trace_icm_handler_err(work->cm_event.event); 3872 ret = -EINVAL; 3873 break; 3874 } 3875 if (ret) 3876 cm_free_work(work); 3877 } 3878 3879 static int cm_establish(struct ib_cm_id *cm_id) 3880 { 3881 struct cm_id_private *cm_id_priv; 3882 struct cm_work *work; 3883 unsigned long flags; 3884 int ret = 0; 3885 struct cm_device *cm_dev; 3886 3887 cm_dev = ib_get_client_data(cm_id->device, &cm_client); 3888 if (!cm_dev) 3889 return -ENODEV; 3890 3891 work = kmalloc(sizeof *work, GFP_ATOMIC); 3892 if (!work) 3893 return -ENOMEM; 3894 3895 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3896 spin_lock_irqsave(&cm_id_priv->lock, flags); 3897 switch (cm_id->state) { 3898 case IB_CM_REP_SENT: 3899 case IB_CM_MRA_REP_RCVD: 3900 cm_id->state = IB_CM_ESTABLISHED; 3901 break; 3902 case IB_CM_ESTABLISHED: 3903 ret = -EISCONN; 3904 break; 3905 default: 3906 trace_icm_establish_err(cm_id); 3907 ret = -EINVAL; 3908 break; 3909 } 3910 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3911 3912 if (ret) { 3913 kfree(work); 3914 goto out; 3915 } 3916 3917 /* 3918 * The CM worker thread may try to destroy the cm_id before it 3919 * can execute this work item. To prevent potential deadlock, 3920 * we need to find the cm_id once we're in the context of the 3921 * worker thread, rather than holding a reference on it. 3922 */ 3923 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3924 work->local_id = cm_id->local_id; 3925 work->remote_id = cm_id->remote_id; 3926 work->mad_recv_wc = NULL; 3927 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3928 3929 /* Check if the device started its remove_one */ 3930 spin_lock_irqsave(&cm.lock, flags); 3931 if (!cm_dev->going_down) { 3932 queue_delayed_work(cm.wq, &work->work, 0); 3933 } else { 3934 kfree(work); 3935 ret = -ENODEV; 3936 } 3937 spin_unlock_irqrestore(&cm.lock, flags); 3938 3939 out: 3940 return ret; 3941 } 3942 3943 static int cm_migrate(struct ib_cm_id *cm_id) 3944 { 3945 struct cm_id_private *cm_id_priv; 3946 unsigned long flags; 3947 int ret = 0; 3948 3949 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3950 spin_lock_irqsave(&cm_id_priv->lock, flags); 3951 if (cm_id->state == IB_CM_ESTABLISHED && 3952 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3953 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3954 cm_id->lap_state = IB_CM_LAP_IDLE; 3955 cm_id_priv->av = cm_id_priv->alt_av; 3956 } else 3957 ret = -EINVAL; 3958 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3959 3960 return ret; 3961 } 3962 3963 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3964 { 3965 int ret; 3966 3967 switch (event) { 3968 case IB_EVENT_COMM_EST: 3969 ret = cm_establish(cm_id); 3970 break; 3971 case IB_EVENT_PATH_MIG: 3972 ret = cm_migrate(cm_id); 3973 break; 3974 default: 3975 ret = -EINVAL; 3976 } 3977 return ret; 3978 } 3979 EXPORT_SYMBOL(ib_cm_notify); 3980 3981 static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3982 struct ib_mad_send_buf *send_buf, 3983 struct ib_mad_recv_wc *mad_recv_wc) 3984 { 3985 struct cm_port *port = mad_agent->context; 3986 struct cm_work *work; 3987 enum ib_cm_event_type event; 3988 bool alt_path = false; 3989 u16 attr_id; 3990 int paths = 0; 3991 int going_down = 0; 3992 3993 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3994 case CM_REQ_ATTR_ID: 3995 alt_path = cm_req_has_alt_path((struct cm_req_msg *) 3996 mad_recv_wc->recv_buf.mad); 3997 paths = 1 + (alt_path != 0); 3998 event = IB_CM_REQ_RECEIVED; 3999 break; 4000 case CM_MRA_ATTR_ID: 4001 event = IB_CM_MRA_RECEIVED; 4002 break; 4003 case CM_REJ_ATTR_ID: 4004 event = IB_CM_REJ_RECEIVED; 4005 break; 4006 case CM_REP_ATTR_ID: 4007 event = IB_CM_REP_RECEIVED; 4008 break; 4009 case CM_RTU_ATTR_ID: 4010 event = IB_CM_RTU_RECEIVED; 4011 break; 4012 case CM_DREQ_ATTR_ID: 4013 event = IB_CM_DREQ_RECEIVED; 4014 break; 4015 case CM_DREP_ATTR_ID: 4016 event = IB_CM_DREP_RECEIVED; 4017 break; 4018 case CM_SIDR_REQ_ATTR_ID: 4019 event = IB_CM_SIDR_REQ_RECEIVED; 4020 break; 4021 case CM_SIDR_REP_ATTR_ID: 4022 event = IB_CM_SIDR_REP_RECEIVED; 4023 break; 4024 case CM_LAP_ATTR_ID: 4025 paths = 1; 4026 event = IB_CM_LAP_RECEIVED; 4027 break; 4028 case CM_APR_ATTR_ID: 4029 event = IB_CM_APR_RECEIVED; 4030 break; 4031 default: 4032 ib_free_recv_mad(mad_recv_wc); 4033 return; 4034 } 4035 4036 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 4037 atomic_long_inc(&port->counters[CM_RECV][attr_id - CM_ATTR_ID_OFFSET]); 4038 4039 work = kmalloc(struct_size(work, path, paths), GFP_KERNEL); 4040 if (!work) { 4041 ib_free_recv_mad(mad_recv_wc); 4042 return; 4043 } 4044 4045 INIT_DELAYED_WORK(&work->work, cm_work_handler); 4046 work->cm_event.event = event; 4047 work->mad_recv_wc = mad_recv_wc; 4048 work->port = port; 4049 4050 /* Check if the device started its remove_one */ 4051 spin_lock_irq(&cm.lock); 4052 if (!port->cm_dev->going_down) 4053 queue_delayed_work(cm.wq, &work->work, 0); 4054 else 4055 going_down = 1; 4056 spin_unlock_irq(&cm.lock); 4057 4058 if (going_down) { 4059 kfree(work); 4060 ib_free_recv_mad(mad_recv_wc); 4061 } 4062 } 4063 4064 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 4065 struct ib_qp_attr *qp_attr, 4066 int *qp_attr_mask) 4067 { 4068 unsigned long flags; 4069 int ret; 4070 4071 spin_lock_irqsave(&cm_id_priv->lock, flags); 4072 switch (cm_id_priv->id.state) { 4073 case IB_CM_REQ_SENT: 4074 case IB_CM_MRA_REQ_RCVD: 4075 case IB_CM_REQ_RCVD: 4076 case IB_CM_MRA_REQ_SENT: 4077 case IB_CM_REP_RCVD: 4078 case IB_CM_MRA_REP_SENT: 4079 case IB_CM_REP_SENT: 4080 case IB_CM_MRA_REP_RCVD: 4081 case IB_CM_ESTABLISHED: 4082 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 4083 IB_QP_PKEY_INDEX | IB_QP_PORT; 4084 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 4085 if (cm_id_priv->responder_resources) { 4086 struct ib_device *ib_dev = cm_id_priv->id.device; 4087 u64 support_flush = ib_dev->attrs.device_cap_flags & 4088 (IB_DEVICE_FLUSH_GLOBAL | IB_DEVICE_FLUSH_PERSISTENT); 4089 u32 flushable = support_flush ? 4090 (IB_ACCESS_FLUSH_GLOBAL | 4091 IB_ACCESS_FLUSH_PERSISTENT) : 0; 4092 4093 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 4094 IB_ACCESS_REMOTE_ATOMIC | 4095 flushable; 4096 } 4097 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 4098 if (cm_id_priv->av.port) 4099 qp_attr->port_num = cm_id_priv->av.port->port_num; 4100 ret = 0; 4101 break; 4102 default: 4103 trace_icm_qp_init_err(&cm_id_priv->id); 4104 ret = -EINVAL; 4105 break; 4106 } 4107 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4108 return ret; 4109 } 4110 4111 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 4112 struct ib_qp_attr *qp_attr, 4113 int *qp_attr_mask) 4114 { 4115 unsigned long flags; 4116 int ret; 4117 4118 spin_lock_irqsave(&cm_id_priv->lock, flags); 4119 switch (cm_id_priv->id.state) { 4120 case IB_CM_REQ_RCVD: 4121 case IB_CM_MRA_REQ_SENT: 4122 case IB_CM_REP_RCVD: 4123 case IB_CM_MRA_REP_SENT: 4124 case IB_CM_REP_SENT: 4125 case IB_CM_MRA_REP_RCVD: 4126 case IB_CM_ESTABLISHED: 4127 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 4128 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 4129 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 4130 if ((qp_attr->ah_attr.type == RDMA_AH_ATTR_TYPE_IB) && 4131 cm_id_priv->av.dlid_datapath && 4132 (cm_id_priv->av.dlid_datapath != 0xffff)) 4133 qp_attr->ah_attr.ib.dlid = cm_id_priv->av.dlid_datapath; 4134 qp_attr->path_mtu = cm_id_priv->path_mtu; 4135 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 4136 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 4137 if (cm_id_priv->qp_type == IB_QPT_RC || 4138 cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 4139 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 4140 IB_QP_MIN_RNR_TIMER; 4141 qp_attr->max_dest_rd_atomic = 4142 cm_id_priv->responder_resources; 4143 qp_attr->min_rnr_timer = 0; 4144 } 4145 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr) && 4146 cm_id_priv->alt_av.port) { 4147 *qp_attr_mask |= IB_QP_ALT_PATH; 4148 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 4149 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 4150 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 4151 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 4152 } 4153 ret = 0; 4154 break; 4155 default: 4156 trace_icm_qp_rtr_err(&cm_id_priv->id); 4157 ret = -EINVAL; 4158 break; 4159 } 4160 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4161 return ret; 4162 } 4163 4164 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 4165 struct ib_qp_attr *qp_attr, 4166 int *qp_attr_mask) 4167 { 4168 unsigned long flags; 4169 int ret; 4170 4171 spin_lock_irqsave(&cm_id_priv->lock, flags); 4172 switch (cm_id_priv->id.state) { 4173 /* Allow transition to RTS before sending REP */ 4174 case IB_CM_REQ_RCVD: 4175 case IB_CM_MRA_REQ_SENT: 4176 4177 case IB_CM_REP_RCVD: 4178 case IB_CM_MRA_REP_SENT: 4179 case IB_CM_REP_SENT: 4180 case IB_CM_MRA_REP_RCVD: 4181 case IB_CM_ESTABLISHED: 4182 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 4183 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 4184 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 4185 switch (cm_id_priv->qp_type) { 4186 case IB_QPT_RC: 4187 case IB_QPT_XRC_INI: 4188 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY | 4189 IB_QP_MAX_QP_RD_ATOMIC; 4190 qp_attr->retry_cnt = cm_id_priv->retry_count; 4191 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 4192 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 4193 fallthrough; 4194 case IB_QPT_XRC_TGT: 4195 *qp_attr_mask |= IB_QP_TIMEOUT; 4196 qp_attr->timeout = cm_id_priv->av.timeout; 4197 break; 4198 default: 4199 break; 4200 } 4201 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) { 4202 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 4203 qp_attr->path_mig_state = IB_MIG_REARM; 4204 } 4205 } else { 4206 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 4207 if (cm_id_priv->alt_av.port) 4208 qp_attr->alt_port_num = 4209 cm_id_priv->alt_av.port->port_num; 4210 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 4211 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 4212 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 4213 qp_attr->path_mig_state = IB_MIG_REARM; 4214 } 4215 ret = 0; 4216 break; 4217 default: 4218 trace_icm_qp_rts_err(&cm_id_priv->id); 4219 ret = -EINVAL; 4220 break; 4221 } 4222 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4223 return ret; 4224 } 4225 4226 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 4227 struct ib_qp_attr *qp_attr, 4228 int *qp_attr_mask) 4229 { 4230 struct cm_id_private *cm_id_priv; 4231 int ret; 4232 4233 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 4234 switch (qp_attr->qp_state) { 4235 case IB_QPS_INIT: 4236 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 4237 break; 4238 case IB_QPS_RTR: 4239 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 4240 break; 4241 case IB_QPS_RTS: 4242 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 4243 break; 4244 default: 4245 ret = -EINVAL; 4246 break; 4247 } 4248 return ret; 4249 } 4250 EXPORT_SYMBOL(ib_cm_init_qp_attr); 4251 4252 static ssize_t cm_show_counter(struct ib_device *ibdev, u32 port_num, 4253 struct ib_port_attribute *attr, char *buf) 4254 { 4255 struct cm_counter_attribute *cm_attr = 4256 container_of(attr, struct cm_counter_attribute, attr); 4257 struct cm_device *cm_dev = ib_get_client_data(ibdev, &cm_client); 4258 4259 if (WARN_ON(!cm_dev)) 4260 return -EINVAL; 4261 4262 return sysfs_emit( 4263 buf, "%ld\n", 4264 atomic_long_read( 4265 &cm_dev->port[port_num - 1] 4266 ->counters[cm_attr->group][cm_attr->index])); 4267 } 4268 4269 #define CM_COUNTER_ATTR(_name, _group, _index) \ 4270 { \ 4271 .attr = __ATTR(_name, 0444, cm_show_counter, NULL), \ 4272 .group = _group, .index = _index \ 4273 } 4274 4275 #define CM_COUNTER_GROUP(_group, _name) \ 4276 static struct cm_counter_attribute cm_counter_attr_##_group[] = { \ 4277 CM_COUNTER_ATTR(req, _group, CM_REQ_COUNTER), \ 4278 CM_COUNTER_ATTR(mra, _group, CM_MRA_COUNTER), \ 4279 CM_COUNTER_ATTR(rej, _group, CM_REJ_COUNTER), \ 4280 CM_COUNTER_ATTR(rep, _group, CM_REP_COUNTER), \ 4281 CM_COUNTER_ATTR(rtu, _group, CM_RTU_COUNTER), \ 4282 CM_COUNTER_ATTR(dreq, _group, CM_DREQ_COUNTER), \ 4283 CM_COUNTER_ATTR(drep, _group, CM_DREP_COUNTER), \ 4284 CM_COUNTER_ATTR(sidr_req, _group, CM_SIDR_REQ_COUNTER), \ 4285 CM_COUNTER_ATTR(sidr_rep, _group, CM_SIDR_REP_COUNTER), \ 4286 CM_COUNTER_ATTR(lap, _group, CM_LAP_COUNTER), \ 4287 CM_COUNTER_ATTR(apr, _group, CM_APR_COUNTER), \ 4288 }; \ 4289 static struct attribute *cm_counter_attrs_##_group[] = { \ 4290 &cm_counter_attr_##_group[0].attr.attr, \ 4291 &cm_counter_attr_##_group[1].attr.attr, \ 4292 &cm_counter_attr_##_group[2].attr.attr, \ 4293 &cm_counter_attr_##_group[3].attr.attr, \ 4294 &cm_counter_attr_##_group[4].attr.attr, \ 4295 &cm_counter_attr_##_group[5].attr.attr, \ 4296 &cm_counter_attr_##_group[6].attr.attr, \ 4297 &cm_counter_attr_##_group[7].attr.attr, \ 4298 &cm_counter_attr_##_group[8].attr.attr, \ 4299 &cm_counter_attr_##_group[9].attr.attr, \ 4300 &cm_counter_attr_##_group[10].attr.attr, \ 4301 NULL, \ 4302 }; \ 4303 static const struct attribute_group cm_counter_group_##_group = { \ 4304 .name = _name, \ 4305 .attrs = cm_counter_attrs_##_group, \ 4306 }; 4307 4308 CM_COUNTER_GROUP(CM_XMIT, "cm_tx_msgs") 4309 CM_COUNTER_GROUP(CM_XMIT_RETRIES, "cm_tx_retries") 4310 CM_COUNTER_GROUP(CM_RECV, "cm_rx_msgs") 4311 CM_COUNTER_GROUP(CM_RECV_DUPLICATES, "cm_rx_duplicates") 4312 4313 static const struct attribute_group *cm_counter_groups[] = { 4314 &cm_counter_group_CM_XMIT, 4315 &cm_counter_group_CM_XMIT_RETRIES, 4316 &cm_counter_group_CM_RECV, 4317 &cm_counter_group_CM_RECV_DUPLICATES, 4318 NULL, 4319 }; 4320 4321 static int cm_add_one(struct ib_device *ib_device) 4322 { 4323 struct cm_device *cm_dev; 4324 struct cm_port *port; 4325 struct ib_mad_reg_req reg_req = { 4326 .mgmt_class = IB_MGMT_CLASS_CM, 4327 .mgmt_class_version = IB_CM_CLASS_VERSION, 4328 }; 4329 struct ib_port_modify port_modify = { 4330 .set_port_cap_mask = IB_PORT_CM_SUP 4331 }; 4332 unsigned long flags; 4333 int ret; 4334 int count = 0; 4335 u32 i; 4336 4337 cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt), 4338 GFP_KERNEL); 4339 if (!cm_dev) 4340 return -ENOMEM; 4341 4342 kref_init(&cm_dev->kref); 4343 rwlock_init(&cm_dev->mad_agent_lock); 4344 cm_dev->ib_device = ib_device; 4345 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay; 4346 cm_dev->going_down = 0; 4347 4348 ib_set_client_data(ib_device, &cm_client, cm_dev); 4349 4350 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 4351 rdma_for_each_port (ib_device, i) { 4352 if (!rdma_cap_ib_cm(ib_device, i)) 4353 continue; 4354 4355 port = kzalloc(sizeof *port, GFP_KERNEL); 4356 if (!port) { 4357 ret = -ENOMEM; 4358 goto error1; 4359 } 4360 4361 cm_dev->port[i-1] = port; 4362 port->cm_dev = cm_dev; 4363 port->port_num = i; 4364 4365 ret = ib_port_register_client_groups(ib_device, i, 4366 cm_counter_groups); 4367 if (ret) 4368 goto error1; 4369 4370 port->mad_agent = ib_register_mad_agent(ib_device, i, 4371 IB_QPT_GSI, 4372 ®_req, 4373 0, 4374 cm_send_handler, 4375 cm_recv_handler, 4376 port, 4377 0); 4378 if (IS_ERR(port->mad_agent)) { 4379 ret = PTR_ERR(port->mad_agent); 4380 goto error2; 4381 } 4382 4383 ret = ib_modify_port(ib_device, i, 0, &port_modify); 4384 if (ret) 4385 goto error3; 4386 4387 count++; 4388 } 4389 4390 if (!count) { 4391 ret = -EOPNOTSUPP; 4392 goto free; 4393 } 4394 4395 write_lock_irqsave(&cm.device_lock, flags); 4396 list_add_tail(&cm_dev->list, &cm.device_list); 4397 write_unlock_irqrestore(&cm.device_lock, flags); 4398 return 0; 4399 4400 error3: 4401 ib_unregister_mad_agent(port->mad_agent); 4402 error2: 4403 ib_port_unregister_client_groups(ib_device, i, cm_counter_groups); 4404 error1: 4405 port_modify.set_port_cap_mask = 0; 4406 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 4407 while (--i) { 4408 if (!rdma_cap_ib_cm(ib_device, i)) 4409 continue; 4410 4411 port = cm_dev->port[i-1]; 4412 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4413 ib_unregister_mad_agent(port->mad_agent); 4414 ib_port_unregister_client_groups(ib_device, i, 4415 cm_counter_groups); 4416 } 4417 free: 4418 cm_device_put(cm_dev); 4419 return ret; 4420 } 4421 4422 static void cm_remove_one(struct ib_device *ib_device, void *client_data) 4423 { 4424 struct cm_device *cm_dev = client_data; 4425 struct cm_port *port; 4426 struct ib_port_modify port_modify = { 4427 .clr_port_cap_mask = IB_PORT_CM_SUP 4428 }; 4429 unsigned long flags; 4430 u32 i; 4431 4432 write_lock_irqsave(&cm.device_lock, flags); 4433 list_del(&cm_dev->list); 4434 write_unlock_irqrestore(&cm.device_lock, flags); 4435 4436 spin_lock_irq(&cm.lock); 4437 cm_dev->going_down = 1; 4438 spin_unlock_irq(&cm.lock); 4439 4440 rdma_for_each_port (ib_device, i) { 4441 struct ib_mad_agent *mad_agent; 4442 4443 if (!rdma_cap_ib_cm(ib_device, i)) 4444 continue; 4445 4446 port = cm_dev->port[i-1]; 4447 mad_agent = port->mad_agent; 4448 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4449 /* 4450 * We flush the queue here after the going_down set, this 4451 * verify that no new works will be queued in the recv handler, 4452 * after that we can call the unregister_mad_agent 4453 */ 4454 flush_workqueue(cm.wq); 4455 /* 4456 * The above ensures no call paths from the work are running, 4457 * the remaining paths all take the mad_agent_lock. 4458 */ 4459 write_lock(&cm_dev->mad_agent_lock); 4460 port->mad_agent = NULL; 4461 write_unlock(&cm_dev->mad_agent_lock); 4462 ib_unregister_mad_agent(mad_agent); 4463 ib_port_unregister_client_groups(ib_device, i, 4464 cm_counter_groups); 4465 } 4466 4467 cm_device_put(cm_dev); 4468 } 4469 4470 static int __init ib_cm_init(void) 4471 { 4472 int ret; 4473 4474 INIT_LIST_HEAD(&cm.device_list); 4475 rwlock_init(&cm.device_lock); 4476 spin_lock_init(&cm.lock); 4477 cm.listen_service_table = RB_ROOT; 4478 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 4479 cm.remote_id_table = RB_ROOT; 4480 cm.remote_qp_table = RB_ROOT; 4481 cm.remote_sidr_table = RB_ROOT; 4482 xa_init_flags(&cm.local_id_table, XA_FLAGS_ALLOC); 4483 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 4484 INIT_LIST_HEAD(&cm.timewait_list); 4485 4486 cm.wq = alloc_workqueue("ib_cm", 0, 1); 4487 if (!cm.wq) { 4488 ret = -ENOMEM; 4489 goto error2; 4490 } 4491 4492 ret = ib_register_client(&cm_client); 4493 if (ret) 4494 goto error3; 4495 4496 return 0; 4497 error3: 4498 destroy_workqueue(cm.wq); 4499 error2: 4500 return ret; 4501 } 4502 4503 static void __exit ib_cm_cleanup(void) 4504 { 4505 struct cm_timewait_info *timewait_info, *tmp; 4506 4507 spin_lock_irq(&cm.lock); 4508 list_for_each_entry(timewait_info, &cm.timewait_list, list) 4509 cancel_delayed_work(&timewait_info->work.work); 4510 spin_unlock_irq(&cm.lock); 4511 4512 ib_unregister_client(&cm_client); 4513 destroy_workqueue(cm.wq); 4514 4515 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 4516 list_del(&timewait_info->list); 4517 kfree(timewait_info); 4518 } 4519 4520 WARN_ON(!xa_empty(&cm.local_id_table)); 4521 } 4522 4523 module_init(ib_cm_init); 4524 module_exit(ib_cm_cleanup); 4525