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 "cm_msgs.h" 29 #include "core_priv.h" 30 #include "cm_trace.h" 31 32 MODULE_AUTHOR("Sean Hefty"); 33 MODULE_DESCRIPTION("InfiniBand CM"); 34 MODULE_LICENSE("Dual BSD/GPL"); 35 36 static const char * const ibcm_rej_reason_strs[] = { 37 [IB_CM_REJ_NO_QP] = "no QP", 38 [IB_CM_REJ_NO_EEC] = "no EEC", 39 [IB_CM_REJ_NO_RESOURCES] = "no resources", 40 [IB_CM_REJ_TIMEOUT] = "timeout", 41 [IB_CM_REJ_UNSUPPORTED] = "unsupported", 42 [IB_CM_REJ_INVALID_COMM_ID] = "invalid comm ID", 43 [IB_CM_REJ_INVALID_COMM_INSTANCE] = "invalid comm instance", 44 [IB_CM_REJ_INVALID_SERVICE_ID] = "invalid service ID", 45 [IB_CM_REJ_INVALID_TRANSPORT_TYPE] = "invalid transport type", 46 [IB_CM_REJ_STALE_CONN] = "stale conn", 47 [IB_CM_REJ_RDC_NOT_EXIST] = "RDC not exist", 48 [IB_CM_REJ_INVALID_GID] = "invalid GID", 49 [IB_CM_REJ_INVALID_LID] = "invalid LID", 50 [IB_CM_REJ_INVALID_SL] = "invalid SL", 51 [IB_CM_REJ_INVALID_TRAFFIC_CLASS] = "invalid traffic class", 52 [IB_CM_REJ_INVALID_HOP_LIMIT] = "invalid hop limit", 53 [IB_CM_REJ_INVALID_PACKET_RATE] = "invalid packet rate", 54 [IB_CM_REJ_INVALID_ALT_GID] = "invalid alt GID", 55 [IB_CM_REJ_INVALID_ALT_LID] = "invalid alt LID", 56 [IB_CM_REJ_INVALID_ALT_SL] = "invalid alt SL", 57 [IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS] = "invalid alt traffic class", 58 [IB_CM_REJ_INVALID_ALT_HOP_LIMIT] = "invalid alt hop limit", 59 [IB_CM_REJ_INVALID_ALT_PACKET_RATE] = "invalid alt packet rate", 60 [IB_CM_REJ_PORT_CM_REDIRECT] = "port CM redirect", 61 [IB_CM_REJ_PORT_REDIRECT] = "port redirect", 62 [IB_CM_REJ_INVALID_MTU] = "invalid MTU", 63 [IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES] = "insufficient resp resources", 64 [IB_CM_REJ_CONSUMER_DEFINED] = "consumer defined", 65 [IB_CM_REJ_INVALID_RNR_RETRY] = "invalid RNR retry", 66 [IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID] = "duplicate local comm ID", 67 [IB_CM_REJ_INVALID_CLASS_VERSION] = "invalid class version", 68 [IB_CM_REJ_INVALID_FLOW_LABEL] = "invalid flow label", 69 [IB_CM_REJ_INVALID_ALT_FLOW_LABEL] = "invalid alt flow label", 70 [IB_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED] = 71 "vendor option is not supported", 72 }; 73 74 const char *__attribute_const__ ibcm_reject_msg(int reason) 75 { 76 size_t index = reason; 77 78 if (index < ARRAY_SIZE(ibcm_rej_reason_strs) && 79 ibcm_rej_reason_strs[index]) 80 return ibcm_rej_reason_strs[index]; 81 else 82 return "unrecognized reason"; 83 } 84 EXPORT_SYMBOL(ibcm_reject_msg); 85 86 struct cm_id_private; 87 struct cm_work; 88 static int cm_add_one(struct ib_device *device); 89 static void cm_remove_one(struct ib_device *device, void *client_data); 90 static void cm_process_work(struct cm_id_private *cm_id_priv, 91 struct cm_work *work); 92 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv, 93 struct ib_cm_sidr_rep_param *param); 94 static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv, 95 const void *private_data, u8 private_data_len); 96 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv, 97 void *private_data, u8 private_data_len); 98 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv, 99 enum ib_cm_rej_reason reason, void *ari, 100 u8 ari_length, const void *private_data, 101 u8 private_data_len); 102 103 static struct ib_client cm_client = { 104 .name = "cm", 105 .add = cm_add_one, 106 .remove = cm_remove_one 107 }; 108 109 static struct ib_cm { 110 spinlock_t lock; 111 struct list_head device_list; 112 rwlock_t device_lock; 113 struct rb_root listen_service_table; 114 u64 listen_service_id; 115 /* struct rb_root peer_service_table; todo: fix peer to peer */ 116 struct rb_root remote_qp_table; 117 struct rb_root remote_id_table; 118 struct rb_root remote_sidr_table; 119 struct xarray local_id_table; 120 u32 local_id_next; 121 __be32 random_id_operand; 122 struct list_head timewait_list; 123 struct workqueue_struct *wq; 124 /* Sync on cm change port state */ 125 spinlock_t state_lock; 126 } cm; 127 128 /* Counter indexes ordered by attribute ID */ 129 enum { 130 CM_REQ_COUNTER, 131 CM_MRA_COUNTER, 132 CM_REJ_COUNTER, 133 CM_REP_COUNTER, 134 CM_RTU_COUNTER, 135 CM_DREQ_COUNTER, 136 CM_DREP_COUNTER, 137 CM_SIDR_REQ_COUNTER, 138 CM_SIDR_REP_COUNTER, 139 CM_LAP_COUNTER, 140 CM_APR_COUNTER, 141 CM_ATTR_COUNT, 142 CM_ATTR_ID_OFFSET = 0x0010, 143 }; 144 145 enum { 146 CM_XMIT, 147 CM_XMIT_RETRIES, 148 CM_RECV, 149 CM_RECV_DUPLICATES, 150 CM_COUNTER_GROUPS 151 }; 152 153 static char const counter_group_names[CM_COUNTER_GROUPS] 154 [sizeof("cm_rx_duplicates")] = { 155 "cm_tx_msgs", "cm_tx_retries", 156 "cm_rx_msgs", "cm_rx_duplicates" 157 }; 158 159 struct cm_counter_group { 160 struct kobject obj; 161 atomic_long_t counter[CM_ATTR_COUNT]; 162 }; 163 164 struct cm_counter_attribute { 165 struct attribute attr; 166 int index; 167 }; 168 169 #define CM_COUNTER_ATTR(_name, _index) \ 170 struct cm_counter_attribute cm_##_name##_counter_attr = { \ 171 .attr = { .name = __stringify(_name), .mode = 0444 }, \ 172 .index = _index \ 173 } 174 175 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER); 176 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER); 177 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER); 178 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER); 179 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER); 180 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER); 181 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER); 182 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER); 183 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER); 184 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER); 185 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER); 186 187 static struct attribute *cm_counter_default_attrs[] = { 188 &cm_req_counter_attr.attr, 189 &cm_mra_counter_attr.attr, 190 &cm_rej_counter_attr.attr, 191 &cm_rep_counter_attr.attr, 192 &cm_rtu_counter_attr.attr, 193 &cm_dreq_counter_attr.attr, 194 &cm_drep_counter_attr.attr, 195 &cm_sidr_req_counter_attr.attr, 196 &cm_sidr_rep_counter_attr.attr, 197 &cm_lap_counter_attr.attr, 198 &cm_apr_counter_attr.attr, 199 NULL 200 }; 201 202 struct cm_port { 203 struct cm_device *cm_dev; 204 struct ib_mad_agent *mad_agent; 205 u8 port_num; 206 struct list_head cm_priv_prim_list; 207 struct list_head cm_priv_altr_list; 208 struct cm_counter_group counter_group[CM_COUNTER_GROUPS]; 209 }; 210 211 struct cm_device { 212 struct list_head list; 213 struct ib_device *ib_device; 214 u8 ack_delay; 215 int going_down; 216 struct cm_port *port[]; 217 }; 218 219 struct cm_av { 220 struct cm_port *port; 221 union ib_gid dgid; 222 struct rdma_ah_attr ah_attr; 223 u16 pkey_index; 224 u8 timeout; 225 }; 226 227 struct cm_work { 228 struct delayed_work work; 229 struct list_head list; 230 struct cm_port *port; 231 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 232 __be32 local_id; /* Established / timewait */ 233 __be32 remote_id; 234 struct ib_cm_event cm_event; 235 struct sa_path_rec path[]; 236 }; 237 238 struct cm_timewait_info { 239 struct cm_work work; 240 struct list_head list; 241 struct rb_node remote_qp_node; 242 struct rb_node remote_id_node; 243 __be64 remote_ca_guid; 244 __be32 remote_qpn; 245 u8 inserted_remote_qp; 246 u8 inserted_remote_id; 247 }; 248 249 struct cm_id_private { 250 struct ib_cm_id id; 251 252 struct rb_node service_node; 253 struct rb_node sidr_id_node; 254 spinlock_t lock; /* Do not acquire inside cm.lock */ 255 struct completion comp; 256 refcount_t refcount; 257 /* Number of clients sharing this ib_cm_id. Only valid for listeners. 258 * Protected by the cm.lock spinlock. */ 259 int listen_sharecount; 260 struct rcu_head rcu; 261 262 struct ib_mad_send_buf *msg; 263 struct cm_timewait_info *timewait_info; 264 /* todo: use alternate port on send failure */ 265 struct cm_av av; 266 struct cm_av alt_av; 267 268 void *private_data; 269 __be64 tid; 270 __be32 local_qpn; 271 __be32 remote_qpn; 272 enum ib_qp_type qp_type; 273 __be32 sq_psn; 274 __be32 rq_psn; 275 int timeout_ms; 276 enum ib_mtu path_mtu; 277 __be16 pkey; 278 u8 private_data_len; 279 u8 max_cm_retries; 280 u8 responder_resources; 281 u8 initiator_depth; 282 u8 retry_count; 283 u8 rnr_retry_count; 284 u8 service_timeout; 285 u8 target_ack_delay; 286 287 struct list_head prim_list; 288 struct list_head altr_list; 289 /* Indicates that the send port mad is registered and av is set */ 290 int prim_send_port_not_ready; 291 int altr_send_port_not_ready; 292 293 struct list_head work_list; 294 atomic_t work_count; 295 296 struct rdma_ucm_ece ece; 297 }; 298 299 static void cm_work_handler(struct work_struct *work); 300 301 static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 302 { 303 if (refcount_dec_and_test(&cm_id_priv->refcount)) 304 complete(&cm_id_priv->comp); 305 } 306 307 static int cm_alloc_msg(struct cm_id_private *cm_id_priv, 308 struct ib_mad_send_buf **msg) 309 { 310 struct ib_mad_agent *mad_agent; 311 struct ib_mad_send_buf *m; 312 struct ib_ah *ah; 313 struct cm_av *av; 314 unsigned long flags, flags2; 315 int ret = 0; 316 317 /* don't let the port to be released till the agent is down */ 318 spin_lock_irqsave(&cm.state_lock, flags2); 319 spin_lock_irqsave(&cm.lock, flags); 320 if (!cm_id_priv->prim_send_port_not_ready) 321 av = &cm_id_priv->av; 322 else if (!cm_id_priv->altr_send_port_not_ready && 323 (cm_id_priv->alt_av.port)) 324 av = &cm_id_priv->alt_av; 325 else { 326 pr_info("%s: not valid CM id\n", __func__); 327 ret = -ENODEV; 328 spin_unlock_irqrestore(&cm.lock, flags); 329 goto out; 330 } 331 spin_unlock_irqrestore(&cm.lock, flags); 332 /* Make sure the port haven't released the mad yet */ 333 mad_agent = cm_id_priv->av.port->mad_agent; 334 if (!mad_agent) { 335 pr_info("%s: not a valid MAD agent\n", __func__); 336 ret = -ENODEV; 337 goto out; 338 } 339 ah = rdma_create_ah(mad_agent->qp->pd, &av->ah_attr, 0); 340 if (IS_ERR(ah)) { 341 ret = PTR_ERR(ah); 342 goto out; 343 } 344 345 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 346 av->pkey_index, 347 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 348 GFP_ATOMIC, 349 IB_MGMT_BASE_VERSION); 350 if (IS_ERR(m)) { 351 rdma_destroy_ah(ah, 0); 352 ret = PTR_ERR(m); 353 goto out; 354 } 355 356 /* Timeout set by caller if response is expected. */ 357 m->ah = ah; 358 m->retries = cm_id_priv->max_cm_retries; 359 360 refcount_inc(&cm_id_priv->refcount); 361 m->context[0] = cm_id_priv; 362 *msg = m; 363 364 out: 365 spin_unlock_irqrestore(&cm.state_lock, flags2); 366 return ret; 367 } 368 369 static struct ib_mad_send_buf *cm_alloc_response_msg_no_ah(struct cm_port *port, 370 struct ib_mad_recv_wc *mad_recv_wc) 371 { 372 return ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 373 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 374 GFP_ATOMIC, 375 IB_MGMT_BASE_VERSION); 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 void cm_free_msg(struct ib_mad_send_buf *msg) 394 { 395 if (msg->ah) 396 rdma_destroy_ah(msg->ah, 0); 397 if (msg->context[0]) 398 cm_deref_id(msg->context[0]); 399 ib_free_send_mad(msg); 400 } 401 402 static int cm_alloc_response_msg(struct cm_port *port, 403 struct ib_mad_recv_wc *mad_recv_wc, 404 struct ib_mad_send_buf **msg) 405 { 406 struct ib_mad_send_buf *m; 407 int ret; 408 409 m = cm_alloc_response_msg_no_ah(port, mad_recv_wc); 410 if (IS_ERR(m)) 411 return PTR_ERR(m); 412 413 ret = cm_create_response_msg_ah(port, mad_recv_wc, m); 414 if (ret) { 415 cm_free_msg(m); 416 return ret; 417 } 418 419 *msg = m; 420 return 0; 421 } 422 423 static void * cm_copy_private_data(const void *private_data, 424 u8 private_data_len) 425 { 426 void *data; 427 428 if (!private_data || !private_data_len) 429 return NULL; 430 431 data = kmemdup(private_data, private_data_len, GFP_KERNEL); 432 if (!data) 433 return ERR_PTR(-ENOMEM); 434 435 return data; 436 } 437 438 static void cm_set_private_data(struct cm_id_private *cm_id_priv, 439 void *private_data, u8 private_data_len) 440 { 441 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 442 kfree(cm_id_priv->private_data); 443 444 cm_id_priv->private_data = private_data; 445 cm_id_priv->private_data_len = private_data_len; 446 } 447 448 static int cm_init_av_for_lap(struct cm_port *port, struct ib_wc *wc, 449 struct ib_grh *grh, struct cm_av *av) 450 { 451 struct rdma_ah_attr new_ah_attr; 452 int ret; 453 454 av->port = port; 455 av->pkey_index = wc->pkey_index; 456 457 /* 458 * av->ah_attr might be initialized based on past wc during incoming 459 * connect request or while sending out connect request. So initialize 460 * a new ah_attr on stack. If initialization fails, old ah_attr is 461 * used for sending any responses. If initialization is successful, 462 * than new ah_attr is used by overwriting old one. 463 */ 464 ret = ib_init_ah_attr_from_wc(port->cm_dev->ib_device, 465 port->port_num, wc, 466 grh, &new_ah_attr); 467 if (ret) 468 return ret; 469 470 rdma_move_ah_attr(&av->ah_attr, &new_ah_attr); 471 return 0; 472 } 473 474 static int cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 475 struct ib_grh *grh, struct cm_av *av) 476 { 477 av->port = port; 478 av->pkey_index = wc->pkey_index; 479 return ib_init_ah_attr_from_wc(port->cm_dev->ib_device, 480 port->port_num, wc, 481 grh, &av->ah_attr); 482 } 483 484 static void add_cm_id_to_port_list(struct cm_id_private *cm_id_priv, 485 struct cm_av *av, struct cm_port *port) 486 { 487 unsigned long flags; 488 489 spin_lock_irqsave(&cm.lock, flags); 490 if (&cm_id_priv->av == av) 491 list_add_tail(&cm_id_priv->prim_list, &port->cm_priv_prim_list); 492 else if (&cm_id_priv->alt_av == av) 493 list_add_tail(&cm_id_priv->altr_list, &port->cm_priv_altr_list); 494 else 495 WARN_ON(true); 496 spin_unlock_irqrestore(&cm.lock, flags); 497 } 498 499 static struct cm_port * 500 get_cm_port_from_path(struct sa_path_rec *path, const struct ib_gid_attr *attr) 501 { 502 struct cm_device *cm_dev; 503 struct cm_port *port = NULL; 504 unsigned long flags; 505 506 if (attr) { 507 read_lock_irqsave(&cm.device_lock, flags); 508 list_for_each_entry(cm_dev, &cm.device_list, list) { 509 if (cm_dev->ib_device == attr->device) { 510 port = cm_dev->port[attr->port_num - 1]; 511 break; 512 } 513 } 514 read_unlock_irqrestore(&cm.device_lock, flags); 515 } else { 516 /* SGID attribute can be NULL in following 517 * conditions. 518 * (a) Alternative path 519 * (b) IB link layer without GRH 520 * (c) LAP send messages 521 */ 522 read_lock_irqsave(&cm.device_lock, flags); 523 list_for_each_entry(cm_dev, &cm.device_list, list) { 524 attr = rdma_find_gid(cm_dev->ib_device, 525 &path->sgid, 526 sa_conv_pathrec_to_gid_type(path), 527 NULL); 528 if (!IS_ERR(attr)) { 529 port = cm_dev->port[attr->port_num - 1]; 530 break; 531 } 532 } 533 read_unlock_irqrestore(&cm.device_lock, flags); 534 if (port) 535 rdma_put_gid_attr(attr); 536 } 537 return port; 538 } 539 540 static int cm_init_av_by_path(struct sa_path_rec *path, 541 const struct ib_gid_attr *sgid_attr, 542 struct cm_av *av, 543 struct cm_id_private *cm_id_priv) 544 { 545 struct rdma_ah_attr new_ah_attr; 546 struct cm_device *cm_dev; 547 struct cm_port *port; 548 int ret; 549 550 port = get_cm_port_from_path(path, sgid_attr); 551 if (!port) 552 return -EINVAL; 553 cm_dev = port->cm_dev; 554 555 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num, 556 be16_to_cpu(path->pkey), &av->pkey_index); 557 if (ret) 558 return ret; 559 560 av->port = port; 561 562 /* 563 * av->ah_attr might be initialized based on wc or during 564 * request processing time which might have reference to sgid_attr. 565 * So initialize a new ah_attr on stack. 566 * If initialization fails, old ah_attr is used for sending any 567 * responses. If initialization is successful, than new ah_attr 568 * is used by overwriting the old one. So that right ah_attr 569 * can be used to return an error response. 570 */ 571 ret = ib_init_ah_attr_from_path(cm_dev->ib_device, port->port_num, path, 572 &new_ah_attr, sgid_attr); 573 if (ret) 574 return ret; 575 576 av->timeout = path->packet_life_time + 1; 577 add_cm_id_to_port_list(cm_id_priv, av, port); 578 rdma_move_ah_attr(&av->ah_attr, &new_ah_attr); 579 return 0; 580 } 581 582 static u32 cm_local_id(__be32 local_id) 583 { 584 return (__force u32) (local_id ^ cm.random_id_operand); 585 } 586 587 static struct cm_id_private *cm_acquire_id(__be32 local_id, __be32 remote_id) 588 { 589 struct cm_id_private *cm_id_priv; 590 591 rcu_read_lock(); 592 cm_id_priv = xa_load(&cm.local_id_table, cm_local_id(local_id)); 593 if (!cm_id_priv || cm_id_priv->id.remote_id != remote_id || 594 !refcount_inc_not_zero(&cm_id_priv->refcount)) 595 cm_id_priv = NULL; 596 rcu_read_unlock(); 597 598 return cm_id_priv; 599 } 600 601 /* 602 * Trivial helpers to strip endian annotation and compare; the 603 * endianness doesn't actually matter since we just need a stable 604 * order for the RB tree. 605 */ 606 static int be32_lt(__be32 a, __be32 b) 607 { 608 return (__force u32) a < (__force u32) b; 609 } 610 611 static int be32_gt(__be32 a, __be32 b) 612 { 613 return (__force u32) a > (__force u32) b; 614 } 615 616 static int be64_lt(__be64 a, __be64 b) 617 { 618 return (__force u64) a < (__force u64) b; 619 } 620 621 static int be64_gt(__be64 a, __be64 b) 622 { 623 return (__force u64) a > (__force u64) b; 624 } 625 626 /* 627 * Inserts a new cm_id_priv into the listen_service_table. Returns cm_id_priv 628 * if the new ID was inserted, NULL if it could not be inserted due to a 629 * collision, or the existing cm_id_priv ready for shared usage. 630 */ 631 static struct cm_id_private *cm_insert_listen(struct cm_id_private *cm_id_priv, 632 ib_cm_handler shared_handler) 633 { 634 struct rb_node **link = &cm.listen_service_table.rb_node; 635 struct rb_node *parent = NULL; 636 struct cm_id_private *cur_cm_id_priv; 637 __be64 service_id = cm_id_priv->id.service_id; 638 __be64 service_mask = cm_id_priv->id.service_mask; 639 unsigned long flags; 640 641 spin_lock_irqsave(&cm.lock, flags); 642 while (*link) { 643 parent = *link; 644 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 645 service_node); 646 if ((cur_cm_id_priv->id.service_mask & service_id) == 647 (service_mask & cur_cm_id_priv->id.service_id) && 648 (cm_id_priv->id.device == cur_cm_id_priv->id.device)) { 649 /* 650 * Sharing an ib_cm_id with different handlers is not 651 * supported 652 */ 653 if (cur_cm_id_priv->id.cm_handler != shared_handler || 654 cur_cm_id_priv->id.context || 655 WARN_ON(!cur_cm_id_priv->id.cm_handler)) { 656 spin_unlock_irqrestore(&cm.lock, flags); 657 return NULL; 658 } 659 refcount_inc(&cur_cm_id_priv->refcount); 660 cur_cm_id_priv->listen_sharecount++; 661 spin_unlock_irqrestore(&cm.lock, flags); 662 return cur_cm_id_priv; 663 } 664 665 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 666 link = &(*link)->rb_left; 667 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 668 link = &(*link)->rb_right; 669 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id)) 670 link = &(*link)->rb_left; 671 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id)) 672 link = &(*link)->rb_right; 673 else 674 link = &(*link)->rb_right; 675 } 676 cm_id_priv->listen_sharecount++; 677 rb_link_node(&cm_id_priv->service_node, parent, link); 678 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 679 spin_unlock_irqrestore(&cm.lock, flags); 680 return cm_id_priv; 681 } 682 683 static struct cm_id_private * cm_find_listen(struct ib_device *device, 684 __be64 service_id) 685 { 686 struct rb_node *node = cm.listen_service_table.rb_node; 687 struct cm_id_private *cm_id_priv; 688 689 while (node) { 690 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 691 if ((cm_id_priv->id.service_mask & service_id) == 692 cm_id_priv->id.service_id && 693 (cm_id_priv->id.device == device)) { 694 refcount_inc(&cm_id_priv->refcount); 695 return cm_id_priv; 696 } 697 if (device < cm_id_priv->id.device) 698 node = node->rb_left; 699 else if (device > cm_id_priv->id.device) 700 node = node->rb_right; 701 else if (be64_lt(service_id, cm_id_priv->id.service_id)) 702 node = node->rb_left; 703 else if (be64_gt(service_id, cm_id_priv->id.service_id)) 704 node = node->rb_right; 705 else 706 node = node->rb_right; 707 } 708 return NULL; 709 } 710 711 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info 712 *timewait_info) 713 { 714 struct rb_node **link = &cm.remote_id_table.rb_node; 715 struct rb_node *parent = NULL; 716 struct cm_timewait_info *cur_timewait_info; 717 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 718 __be32 remote_id = timewait_info->work.remote_id; 719 720 while (*link) { 721 parent = *link; 722 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 723 remote_id_node); 724 if (be32_lt(remote_id, cur_timewait_info->work.remote_id)) 725 link = &(*link)->rb_left; 726 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id)) 727 link = &(*link)->rb_right; 728 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 729 link = &(*link)->rb_left; 730 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 731 link = &(*link)->rb_right; 732 else 733 return cur_timewait_info; 734 } 735 timewait_info->inserted_remote_id = 1; 736 rb_link_node(&timewait_info->remote_id_node, parent, link); 737 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 738 return NULL; 739 } 740 741 static struct cm_id_private *cm_find_remote_id(__be64 remote_ca_guid, 742 __be32 remote_id) 743 { 744 struct rb_node *node = cm.remote_id_table.rb_node; 745 struct cm_timewait_info *timewait_info; 746 struct cm_id_private *res = NULL; 747 748 spin_lock_irq(&cm.lock); 749 while (node) { 750 timewait_info = rb_entry(node, struct cm_timewait_info, 751 remote_id_node); 752 if (be32_lt(remote_id, timewait_info->work.remote_id)) 753 node = node->rb_left; 754 else if (be32_gt(remote_id, timewait_info->work.remote_id)) 755 node = node->rb_right; 756 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid)) 757 node = node->rb_left; 758 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid)) 759 node = node->rb_right; 760 else { 761 res = cm_acquire_id(timewait_info->work.local_id, 762 timewait_info->work.remote_id); 763 break; 764 } 765 } 766 spin_unlock_irq(&cm.lock); 767 return res; 768 } 769 770 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info 771 *timewait_info) 772 { 773 struct rb_node **link = &cm.remote_qp_table.rb_node; 774 struct rb_node *parent = NULL; 775 struct cm_timewait_info *cur_timewait_info; 776 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 777 __be32 remote_qpn = timewait_info->remote_qpn; 778 779 while (*link) { 780 parent = *link; 781 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 782 remote_qp_node); 783 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn)) 784 link = &(*link)->rb_left; 785 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn)) 786 link = &(*link)->rb_right; 787 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 788 link = &(*link)->rb_left; 789 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 790 link = &(*link)->rb_right; 791 else 792 return cur_timewait_info; 793 } 794 timewait_info->inserted_remote_qp = 1; 795 rb_link_node(&timewait_info->remote_qp_node, parent, link); 796 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 797 return NULL; 798 } 799 800 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private 801 *cm_id_priv) 802 { 803 struct rb_node **link = &cm.remote_sidr_table.rb_node; 804 struct rb_node *parent = NULL; 805 struct cm_id_private *cur_cm_id_priv; 806 union ib_gid *port_gid = &cm_id_priv->av.dgid; 807 __be32 remote_id = cm_id_priv->id.remote_id; 808 809 while (*link) { 810 parent = *link; 811 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 812 sidr_id_node); 813 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id)) 814 link = &(*link)->rb_left; 815 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id)) 816 link = &(*link)->rb_right; 817 else { 818 int cmp; 819 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, 820 sizeof *port_gid); 821 if (cmp < 0) 822 link = &(*link)->rb_left; 823 else if (cmp > 0) 824 link = &(*link)->rb_right; 825 else 826 return cur_cm_id_priv; 827 } 828 } 829 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 830 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 831 return NULL; 832 } 833 834 static struct cm_id_private *cm_alloc_id_priv(struct ib_device *device, 835 ib_cm_handler cm_handler, 836 void *context) 837 { 838 struct cm_id_private *cm_id_priv; 839 u32 id; 840 int ret; 841 842 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 843 if (!cm_id_priv) 844 return ERR_PTR(-ENOMEM); 845 846 cm_id_priv->id.state = IB_CM_IDLE; 847 cm_id_priv->id.device = device; 848 cm_id_priv->id.cm_handler = cm_handler; 849 cm_id_priv->id.context = context; 850 cm_id_priv->id.remote_cm_qpn = 1; 851 852 RB_CLEAR_NODE(&cm_id_priv->service_node); 853 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); 854 spin_lock_init(&cm_id_priv->lock); 855 init_completion(&cm_id_priv->comp); 856 INIT_LIST_HEAD(&cm_id_priv->work_list); 857 INIT_LIST_HEAD(&cm_id_priv->prim_list); 858 INIT_LIST_HEAD(&cm_id_priv->altr_list); 859 atomic_set(&cm_id_priv->work_count, -1); 860 refcount_set(&cm_id_priv->refcount, 1); 861 862 ret = xa_alloc_cyclic(&cm.local_id_table, &id, NULL, xa_limit_32b, 863 &cm.local_id_next, GFP_KERNEL); 864 if (ret < 0) 865 goto error; 866 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand; 867 868 return cm_id_priv; 869 870 error: 871 kfree(cm_id_priv); 872 return ERR_PTR(ret); 873 } 874 875 /* 876 * Make the ID visible to the MAD handlers and other threads that use the 877 * xarray. 878 */ 879 static void cm_finalize_id(struct cm_id_private *cm_id_priv) 880 { 881 xa_store(&cm.local_id_table, cm_local_id(cm_id_priv->id.local_id), 882 cm_id_priv, GFP_ATOMIC); 883 } 884 885 struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 886 ib_cm_handler cm_handler, 887 void *context) 888 { 889 struct cm_id_private *cm_id_priv; 890 891 cm_id_priv = cm_alloc_id_priv(device, cm_handler, context); 892 if (IS_ERR(cm_id_priv)) 893 return ERR_CAST(cm_id_priv); 894 895 cm_finalize_id(cm_id_priv); 896 return &cm_id_priv->id; 897 } 898 EXPORT_SYMBOL(ib_create_cm_id); 899 900 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 901 { 902 struct cm_work *work; 903 904 if (list_empty(&cm_id_priv->work_list)) 905 return NULL; 906 907 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 908 list_del(&work->list); 909 return work; 910 } 911 912 static void cm_free_work(struct cm_work *work) 913 { 914 if (work->mad_recv_wc) 915 ib_free_recv_mad(work->mad_recv_wc); 916 kfree(work); 917 } 918 919 static void cm_queue_work_unlock(struct cm_id_private *cm_id_priv, 920 struct cm_work *work) 921 __releases(&cm_id_priv->lock) 922 { 923 bool immediate; 924 925 /* 926 * To deliver the event to the user callback we have the drop the 927 * spinlock, however, we need to ensure that the user callback is single 928 * threaded and receives events in the temporal order. If there are 929 * already events being processed then thread new events onto a list, 930 * the thread currently processing will pick them up. 931 */ 932 immediate = atomic_inc_and_test(&cm_id_priv->work_count); 933 if (!immediate) { 934 list_add_tail(&work->list, &cm_id_priv->work_list); 935 /* 936 * This routine always consumes incoming reference. Once queued 937 * to the work_list then a reference is held by the thread 938 * currently running cm_process_work() and this reference is not 939 * needed. 940 */ 941 cm_deref_id(cm_id_priv); 942 } 943 spin_unlock_irq(&cm_id_priv->lock); 944 945 if (immediate) 946 cm_process_work(cm_id_priv, work); 947 } 948 949 static inline int cm_convert_to_ms(int iba_time) 950 { 951 /* approximate conversion to ms from 4.096us x 2^iba_time */ 952 return 1 << max(iba_time - 8, 0); 953 } 954 955 /* 956 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 957 * Because of how ack_timeout is stored, adding one doubles the timeout. 958 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 959 * increment it (round up) only if the other is within 50%. 960 */ 961 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 962 { 963 int ack_timeout = packet_life_time + 1; 964 965 if (ack_timeout >= ca_ack_delay) 966 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 967 else 968 ack_timeout = ca_ack_delay + 969 (ack_timeout >= (ca_ack_delay - 1)); 970 971 return min(31, ack_timeout); 972 } 973 974 static void cm_remove_remote(struct cm_id_private *cm_id_priv) 975 { 976 struct cm_timewait_info *timewait_info = cm_id_priv->timewait_info; 977 978 if (timewait_info->inserted_remote_id) { 979 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 980 timewait_info->inserted_remote_id = 0; 981 } 982 983 if (timewait_info->inserted_remote_qp) { 984 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 985 timewait_info->inserted_remote_qp = 0; 986 } 987 } 988 989 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 990 { 991 struct cm_timewait_info *timewait_info; 992 993 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 994 if (!timewait_info) 995 return ERR_PTR(-ENOMEM); 996 997 timewait_info->work.local_id = local_id; 998 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 999 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 1000 return timewait_info; 1001 } 1002 1003 static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 1004 { 1005 int wait_time; 1006 unsigned long flags; 1007 struct cm_device *cm_dev; 1008 1009 lockdep_assert_held(&cm_id_priv->lock); 1010 1011 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client); 1012 if (!cm_dev) 1013 return; 1014 1015 spin_lock_irqsave(&cm.lock, flags); 1016 cm_remove_remote(cm_id_priv); 1017 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 1018 spin_unlock_irqrestore(&cm.lock, flags); 1019 1020 /* 1021 * The cm_id could be destroyed by the user before we exit timewait. 1022 * To protect against this, we search for the cm_id after exiting 1023 * timewait before notifying the user that we've exited timewait. 1024 */ 1025 cm_id_priv->id.state = IB_CM_TIMEWAIT; 1026 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 1027 1028 /* Check if the device started its remove_one */ 1029 spin_lock_irqsave(&cm.lock, flags); 1030 if (!cm_dev->going_down) 1031 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 1032 msecs_to_jiffies(wait_time)); 1033 spin_unlock_irqrestore(&cm.lock, flags); 1034 1035 /* 1036 * The timewait_info is converted into a work and gets freed during 1037 * cm_free_work() in cm_timewait_handler(). 1038 */ 1039 BUILD_BUG_ON(offsetof(struct cm_timewait_info, work) != 0); 1040 cm_id_priv->timewait_info = NULL; 1041 } 1042 1043 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 1044 { 1045 unsigned long flags; 1046 1047 lockdep_assert_held(&cm_id_priv->lock); 1048 1049 cm_id_priv->id.state = IB_CM_IDLE; 1050 if (cm_id_priv->timewait_info) { 1051 spin_lock_irqsave(&cm.lock, flags); 1052 cm_remove_remote(cm_id_priv); 1053 spin_unlock_irqrestore(&cm.lock, flags); 1054 kfree(cm_id_priv->timewait_info); 1055 cm_id_priv->timewait_info = NULL; 1056 } 1057 } 1058 1059 static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 1060 { 1061 struct cm_id_private *cm_id_priv; 1062 struct cm_work *work; 1063 1064 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1065 spin_lock_irq(&cm_id_priv->lock); 1066 retest: 1067 switch (cm_id->state) { 1068 case IB_CM_LISTEN: 1069 spin_lock(&cm.lock); 1070 if (--cm_id_priv->listen_sharecount > 0) { 1071 /* The id is still shared. */ 1072 WARN_ON(refcount_read(&cm_id_priv->refcount) == 1); 1073 spin_unlock(&cm.lock); 1074 spin_unlock_irq(&cm_id_priv->lock); 1075 cm_deref_id(cm_id_priv); 1076 return; 1077 } 1078 cm_id->state = IB_CM_IDLE; 1079 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 1080 RB_CLEAR_NODE(&cm_id_priv->service_node); 1081 spin_unlock(&cm.lock); 1082 break; 1083 case IB_CM_SIDR_REQ_SENT: 1084 cm_id->state = IB_CM_IDLE; 1085 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1086 break; 1087 case IB_CM_SIDR_REQ_RCVD: 1088 cm_send_sidr_rep_locked(cm_id_priv, 1089 &(struct ib_cm_sidr_rep_param){ 1090 .status = IB_SIDR_REJECT }); 1091 /* cm_send_sidr_rep_locked will not move to IDLE if it fails */ 1092 cm_id->state = IB_CM_IDLE; 1093 break; 1094 case IB_CM_REQ_SENT: 1095 case IB_CM_MRA_REQ_RCVD: 1096 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1097 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_TIMEOUT, 1098 &cm_id_priv->id.device->node_guid, 1099 sizeof(cm_id_priv->id.device->node_guid), 1100 NULL, 0); 1101 break; 1102 case IB_CM_REQ_RCVD: 1103 if (err == -ENOMEM) { 1104 /* Do not reject to allow future retries. */ 1105 cm_reset_to_idle(cm_id_priv); 1106 } else { 1107 cm_send_rej_locked(cm_id_priv, 1108 IB_CM_REJ_CONSUMER_DEFINED, NULL, 0, 1109 NULL, 0); 1110 } 1111 break; 1112 case IB_CM_REP_SENT: 1113 case IB_CM_MRA_REP_RCVD: 1114 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1115 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL, 1116 0, NULL, 0); 1117 goto retest; 1118 case IB_CM_MRA_REQ_SENT: 1119 case IB_CM_REP_RCVD: 1120 case IB_CM_MRA_REP_SENT: 1121 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL, 1122 0, NULL, 0); 1123 break; 1124 case IB_CM_ESTABLISHED: 1125 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 1126 cm_id->state = IB_CM_IDLE; 1127 break; 1128 } 1129 cm_send_dreq_locked(cm_id_priv, NULL, 0); 1130 goto retest; 1131 case IB_CM_DREQ_SENT: 1132 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1133 cm_enter_timewait(cm_id_priv); 1134 goto retest; 1135 case IB_CM_DREQ_RCVD: 1136 cm_send_drep_locked(cm_id_priv, NULL, 0); 1137 WARN_ON(cm_id->state != IB_CM_TIMEWAIT); 1138 goto retest; 1139 case IB_CM_TIMEWAIT: 1140 /* 1141 * The cm_acquire_id in cm_timewait_handler will stop working 1142 * once we do xa_erase below, so just move to idle here for 1143 * consistency. 1144 */ 1145 cm_id->state = IB_CM_IDLE; 1146 break; 1147 case IB_CM_IDLE: 1148 break; 1149 } 1150 WARN_ON(cm_id->state != IB_CM_IDLE); 1151 1152 spin_lock(&cm.lock); 1153 /* Required for cleanup paths related cm_req_handler() */ 1154 if (cm_id_priv->timewait_info) { 1155 cm_remove_remote(cm_id_priv); 1156 kfree(cm_id_priv->timewait_info); 1157 cm_id_priv->timewait_info = NULL; 1158 } 1159 if (!list_empty(&cm_id_priv->altr_list) && 1160 (!cm_id_priv->altr_send_port_not_ready)) 1161 list_del(&cm_id_priv->altr_list); 1162 if (!list_empty(&cm_id_priv->prim_list) && 1163 (!cm_id_priv->prim_send_port_not_ready)) 1164 list_del(&cm_id_priv->prim_list); 1165 WARN_ON(cm_id_priv->listen_sharecount); 1166 WARN_ON(!RB_EMPTY_NODE(&cm_id_priv->service_node)); 1167 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) 1168 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 1169 spin_unlock(&cm.lock); 1170 spin_unlock_irq(&cm_id_priv->lock); 1171 1172 xa_erase(&cm.local_id_table, cm_local_id(cm_id->local_id)); 1173 cm_deref_id(cm_id_priv); 1174 wait_for_completion(&cm_id_priv->comp); 1175 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 1176 cm_free_work(work); 1177 1178 rdma_destroy_ah_attr(&cm_id_priv->av.ah_attr); 1179 rdma_destroy_ah_attr(&cm_id_priv->alt_av.ah_attr); 1180 kfree(cm_id_priv->private_data); 1181 kfree_rcu(cm_id_priv, rcu); 1182 } 1183 1184 void ib_destroy_cm_id(struct ib_cm_id *cm_id) 1185 { 1186 cm_destroy_id(cm_id, 0); 1187 } 1188 EXPORT_SYMBOL(ib_destroy_cm_id); 1189 1190 static int cm_init_listen(struct cm_id_private *cm_id_priv, __be64 service_id, 1191 __be64 service_mask) 1192 { 1193 service_mask = service_mask ? service_mask : ~cpu_to_be64(0); 1194 service_id &= service_mask; 1195 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 1196 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 1197 return -EINVAL; 1198 1199 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 1200 cm_id_priv->id.service_id = cpu_to_be64(cm.listen_service_id++); 1201 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 1202 } else { 1203 cm_id_priv->id.service_id = service_id; 1204 cm_id_priv->id.service_mask = service_mask; 1205 } 1206 return 0; 1207 } 1208 1209 /** 1210 * ib_cm_listen - Initiates listening on the specified service ID for 1211 * connection and service ID resolution requests. 1212 * @cm_id: Connection identifier associated with the listen request. 1213 * @service_id: Service identifier matched against incoming connection 1214 * and service ID resolution requests. The service ID should be specified 1215 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1216 * assign a service ID to the caller. 1217 * @service_mask: Mask applied to service ID used to listen across a 1218 * range of service IDs. If set to 0, the service ID is matched 1219 * exactly. This parameter is ignored if %service_id is set to 1220 * IB_CM_ASSIGN_SERVICE_ID. 1221 */ 1222 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask) 1223 { 1224 struct cm_id_private *cm_id_priv = 1225 container_of(cm_id, struct cm_id_private, id); 1226 unsigned long flags; 1227 int ret; 1228 1229 spin_lock_irqsave(&cm_id_priv->lock, flags); 1230 if (cm_id_priv->id.state != IB_CM_IDLE) { 1231 ret = -EINVAL; 1232 goto out; 1233 } 1234 1235 ret = cm_init_listen(cm_id_priv, service_id, service_mask); 1236 if (ret) 1237 goto out; 1238 1239 if (!cm_insert_listen(cm_id_priv, NULL)) { 1240 ret = -EBUSY; 1241 goto out; 1242 } 1243 1244 cm_id_priv->id.state = IB_CM_LISTEN; 1245 ret = 0; 1246 1247 out: 1248 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1249 return ret; 1250 } 1251 EXPORT_SYMBOL(ib_cm_listen); 1252 1253 /** 1254 * ib_cm_insert_listen - Create a new listening ib_cm_id and listen on 1255 * the given service ID. 1256 * 1257 * If there's an existing ID listening on that same device and service ID, 1258 * return it. 1259 * 1260 * @device: Device associated with the cm_id. All related communication will 1261 * be associated with the specified device. 1262 * @cm_handler: Callback invoked to notify the user of CM events. 1263 * @service_id: Service identifier matched against incoming connection 1264 * and service ID resolution requests. The service ID should be specified 1265 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1266 * assign a service ID to the caller. 1267 * 1268 * Callers should call ib_destroy_cm_id when done with the listener ID. 1269 */ 1270 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device, 1271 ib_cm_handler cm_handler, 1272 __be64 service_id) 1273 { 1274 struct cm_id_private *listen_id_priv; 1275 struct cm_id_private *cm_id_priv; 1276 int err = 0; 1277 1278 /* Create an ID in advance, since the creation may sleep */ 1279 cm_id_priv = cm_alloc_id_priv(device, cm_handler, NULL); 1280 if (IS_ERR(cm_id_priv)) 1281 return ERR_CAST(cm_id_priv); 1282 1283 err = cm_init_listen(cm_id_priv, service_id, 0); 1284 if (err) 1285 return ERR_PTR(err); 1286 1287 spin_lock_irq(&cm_id_priv->lock); 1288 listen_id_priv = cm_insert_listen(cm_id_priv, cm_handler); 1289 if (listen_id_priv != cm_id_priv) { 1290 spin_unlock_irq(&cm_id_priv->lock); 1291 ib_destroy_cm_id(&cm_id_priv->id); 1292 if (!listen_id_priv) 1293 return ERR_PTR(-EINVAL); 1294 return &listen_id_priv->id; 1295 } 1296 cm_id_priv->id.state = IB_CM_LISTEN; 1297 spin_unlock_irq(&cm_id_priv->lock); 1298 1299 /* 1300 * A listen ID does not need to be in the xarray since it does not 1301 * receive mads, is not placed in the remote_id or remote_qpn rbtree, 1302 * and does not enter timewait. 1303 */ 1304 1305 return &cm_id_priv->id; 1306 } 1307 EXPORT_SYMBOL(ib_cm_insert_listen); 1308 1309 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv) 1310 { 1311 u64 hi_tid, low_tid; 1312 1313 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 1314 low_tid = (u64)cm_id_priv->id.local_id; 1315 return cpu_to_be64(hi_tid | low_tid); 1316 } 1317 1318 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 1319 __be16 attr_id, __be64 tid) 1320 { 1321 hdr->base_version = IB_MGMT_BASE_VERSION; 1322 hdr->mgmt_class = IB_MGMT_CLASS_CM; 1323 hdr->class_version = IB_CM_CLASS_VERSION; 1324 hdr->method = IB_MGMT_METHOD_SEND; 1325 hdr->attr_id = attr_id; 1326 hdr->tid = tid; 1327 } 1328 1329 static void cm_format_mad_ece_hdr(struct ib_mad_hdr *hdr, __be16 attr_id, 1330 __be64 tid, u32 attr_mod) 1331 { 1332 cm_format_mad_hdr(hdr, attr_id, tid); 1333 hdr->attr_mod = cpu_to_be32(attr_mod); 1334 } 1335 1336 static void cm_format_req(struct cm_req_msg *req_msg, 1337 struct cm_id_private *cm_id_priv, 1338 struct ib_cm_req_param *param) 1339 { 1340 struct sa_path_rec *pri_path = param->primary_path; 1341 struct sa_path_rec *alt_path = param->alternate_path; 1342 bool pri_ext = false; 1343 1344 if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA) 1345 pri_ext = opa_is_extended_lid(pri_path->opa.dlid, 1346 pri_path->opa.slid); 1347 1348 cm_format_mad_ece_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1349 cm_form_tid(cm_id_priv), param->ece.attr_mod); 1350 1351 IBA_SET(CM_REQ_LOCAL_COMM_ID, req_msg, 1352 be32_to_cpu(cm_id_priv->id.local_id)); 1353 IBA_SET(CM_REQ_SERVICE_ID, req_msg, be64_to_cpu(param->service_id)); 1354 IBA_SET(CM_REQ_LOCAL_CA_GUID, req_msg, 1355 be64_to_cpu(cm_id_priv->id.device->node_guid)); 1356 IBA_SET(CM_REQ_LOCAL_QPN, req_msg, param->qp_num); 1357 IBA_SET(CM_REQ_INITIATOR_DEPTH, req_msg, param->initiator_depth); 1358 IBA_SET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg, 1359 param->remote_cm_response_timeout); 1360 cm_req_set_qp_type(req_msg, param->qp_type); 1361 IBA_SET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg, param->flow_control); 1362 IBA_SET(CM_REQ_STARTING_PSN, req_msg, param->starting_psn); 1363 IBA_SET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg, 1364 param->local_cm_response_timeout); 1365 IBA_SET(CM_REQ_PARTITION_KEY, req_msg, 1366 be16_to_cpu(param->primary_path->pkey)); 1367 IBA_SET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg, 1368 param->primary_path->mtu); 1369 IBA_SET(CM_REQ_MAX_CM_RETRIES, req_msg, param->max_cm_retries); 1370 1371 if (param->qp_type != IB_QPT_XRC_INI) { 1372 IBA_SET(CM_REQ_RESPONDER_RESOURCES, req_msg, 1373 param->responder_resources); 1374 IBA_SET(CM_REQ_RETRY_COUNT, req_msg, param->retry_count); 1375 IBA_SET(CM_REQ_RNR_RETRY_COUNT, req_msg, 1376 param->rnr_retry_count); 1377 IBA_SET(CM_REQ_SRQ, req_msg, param->srq); 1378 } 1379 1380 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) = 1381 pri_path->sgid; 1382 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) = 1383 pri_path->dgid; 1384 if (pri_ext) { 1385 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) 1386 ->global.interface_id = 1387 OPA_MAKE_ID(be32_to_cpu(pri_path->opa.slid)); 1388 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) 1389 ->global.interface_id = 1390 OPA_MAKE_ID(be32_to_cpu(pri_path->opa.dlid)); 1391 } 1392 if (pri_path->hop_limit <= 1) { 1393 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 1394 be16_to_cpu(pri_ext ? 0 : 1395 htons(ntohl(sa_path_get_slid( 1396 pri_path))))); 1397 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, 1398 be16_to_cpu(pri_ext ? 0 : 1399 htons(ntohl(sa_path_get_dlid( 1400 pri_path))))); 1401 } else { 1402 /* Work-around until there's a way to obtain remote LID info */ 1403 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 1404 be16_to_cpu(IB_LID_PERMISSIVE)); 1405 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, 1406 be16_to_cpu(IB_LID_PERMISSIVE)); 1407 } 1408 IBA_SET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg, 1409 be32_to_cpu(pri_path->flow_label)); 1410 IBA_SET(CM_REQ_PRIMARY_PACKET_RATE, req_msg, pri_path->rate); 1411 IBA_SET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg, pri_path->traffic_class); 1412 IBA_SET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg, pri_path->hop_limit); 1413 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, pri_path->sl); 1414 IBA_SET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg, 1415 (pri_path->hop_limit <= 1)); 1416 IBA_SET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg, 1417 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1418 pri_path->packet_life_time)); 1419 1420 if (alt_path) { 1421 bool alt_ext = false; 1422 1423 if (alt_path->rec_type == SA_PATH_REC_TYPE_OPA) 1424 alt_ext = opa_is_extended_lid(alt_path->opa.dlid, 1425 alt_path->opa.slid); 1426 1427 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg) = 1428 alt_path->sgid; 1429 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg) = 1430 alt_path->dgid; 1431 if (alt_ext) { 1432 IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, 1433 req_msg) 1434 ->global.interface_id = 1435 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.slid)); 1436 IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, 1437 req_msg) 1438 ->global.interface_id = 1439 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.dlid)); 1440 } 1441 if (alt_path->hop_limit <= 1) { 1442 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, 1443 be16_to_cpu( 1444 alt_ext ? 0 : 1445 htons(ntohl(sa_path_get_slid( 1446 alt_path))))); 1447 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, 1448 be16_to_cpu( 1449 alt_ext ? 0 : 1450 htons(ntohl(sa_path_get_dlid( 1451 alt_path))))); 1452 } else { 1453 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, 1454 be16_to_cpu(IB_LID_PERMISSIVE)); 1455 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, 1456 be16_to_cpu(IB_LID_PERMISSIVE)); 1457 } 1458 IBA_SET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg, 1459 be32_to_cpu(alt_path->flow_label)); 1460 IBA_SET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg, alt_path->rate); 1461 IBA_SET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg, 1462 alt_path->traffic_class); 1463 IBA_SET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg, 1464 alt_path->hop_limit); 1465 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, alt_path->sl); 1466 IBA_SET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg, 1467 (alt_path->hop_limit <= 1)); 1468 IBA_SET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg, 1469 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1470 alt_path->packet_life_time)); 1471 } 1472 IBA_SET(CM_REQ_VENDOR_ID, req_msg, param->ece.vendor_id); 1473 1474 if (param->private_data && param->private_data_len) 1475 IBA_SET_MEM(CM_REQ_PRIVATE_DATA, req_msg, param->private_data, 1476 param->private_data_len); 1477 } 1478 1479 static int cm_validate_req_param(struct ib_cm_req_param *param) 1480 { 1481 if (!param->primary_path) 1482 return -EINVAL; 1483 1484 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC && 1485 param->qp_type != IB_QPT_XRC_INI) 1486 return -EINVAL; 1487 1488 if (param->private_data && 1489 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1490 return -EINVAL; 1491 1492 if (param->alternate_path && 1493 (param->alternate_path->pkey != param->primary_path->pkey || 1494 param->alternate_path->mtu != param->primary_path->mtu)) 1495 return -EINVAL; 1496 1497 return 0; 1498 } 1499 1500 int ib_send_cm_req(struct ib_cm_id *cm_id, 1501 struct ib_cm_req_param *param) 1502 { 1503 struct cm_id_private *cm_id_priv; 1504 struct cm_req_msg *req_msg; 1505 unsigned long flags; 1506 int ret; 1507 1508 ret = cm_validate_req_param(param); 1509 if (ret) 1510 return ret; 1511 1512 /* Verify that we're not in timewait. */ 1513 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1514 spin_lock_irqsave(&cm_id_priv->lock, flags); 1515 if (cm_id->state != IB_CM_IDLE || WARN_ON(cm_id_priv->timewait_info)) { 1516 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1517 ret = -EINVAL; 1518 goto out; 1519 } 1520 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1521 1522 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1523 id.local_id); 1524 if (IS_ERR(cm_id_priv->timewait_info)) { 1525 ret = PTR_ERR(cm_id_priv->timewait_info); 1526 cm_id_priv->timewait_info = NULL; 1527 goto out; 1528 } 1529 1530 ret = cm_init_av_by_path(param->primary_path, 1531 param->ppath_sgid_attr, &cm_id_priv->av, 1532 cm_id_priv); 1533 if (ret) 1534 goto out; 1535 if (param->alternate_path) { 1536 ret = cm_init_av_by_path(param->alternate_path, NULL, 1537 &cm_id_priv->alt_av, cm_id_priv); 1538 if (ret) 1539 goto out; 1540 } 1541 cm_id->service_id = param->service_id; 1542 cm_id->service_mask = ~cpu_to_be64(0); 1543 cm_id_priv->timeout_ms = cm_convert_to_ms( 1544 param->primary_path->packet_life_time) * 2 + 1545 cm_convert_to_ms( 1546 param->remote_cm_response_timeout); 1547 cm_id_priv->max_cm_retries = param->max_cm_retries; 1548 cm_id_priv->initiator_depth = param->initiator_depth; 1549 cm_id_priv->responder_resources = param->responder_resources; 1550 cm_id_priv->retry_count = param->retry_count; 1551 cm_id_priv->path_mtu = param->primary_path->mtu; 1552 cm_id_priv->pkey = param->primary_path->pkey; 1553 cm_id_priv->qp_type = param->qp_type; 1554 1555 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1556 if (ret) 1557 goto out; 1558 1559 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1560 cm_format_req(req_msg, cm_id_priv, param); 1561 cm_id_priv->tid = req_msg->hdr.tid; 1562 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1563 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1564 1565 cm_id_priv->local_qpn = cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg)); 1566 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg)); 1567 1568 trace_icm_send_req(&cm_id_priv->id); 1569 spin_lock_irqsave(&cm_id_priv->lock, flags); 1570 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1571 if (ret) { 1572 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1573 goto error2; 1574 } 1575 BUG_ON(cm_id->state != IB_CM_IDLE); 1576 cm_id->state = IB_CM_REQ_SENT; 1577 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1578 return 0; 1579 1580 error2: cm_free_msg(cm_id_priv->msg); 1581 out: return ret; 1582 } 1583 EXPORT_SYMBOL(ib_send_cm_req); 1584 1585 static int cm_issue_rej(struct cm_port *port, 1586 struct ib_mad_recv_wc *mad_recv_wc, 1587 enum ib_cm_rej_reason reason, 1588 enum cm_msg_response msg_rejected, 1589 void *ari, u8 ari_length) 1590 { 1591 struct ib_mad_send_buf *msg = NULL; 1592 struct cm_rej_msg *rej_msg, *rcv_msg; 1593 int ret; 1594 1595 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1596 if (ret) 1597 return ret; 1598 1599 /* We just need common CM header information. Cast to any message. */ 1600 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1601 rej_msg = (struct cm_rej_msg *) msg->mad; 1602 1603 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1604 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg, 1605 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg)); 1606 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1607 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg)); 1608 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, msg_rejected); 1609 IBA_SET(CM_REJ_REASON, rej_msg, reason); 1610 1611 if (ari && ari_length) { 1612 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length); 1613 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length); 1614 } 1615 1616 trace_icm_issue_rej( 1617 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg), 1618 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg)); 1619 ret = ib_post_send_mad(msg, NULL); 1620 if (ret) 1621 cm_free_msg(msg); 1622 1623 return ret; 1624 } 1625 1626 static bool cm_req_has_alt_path(struct cm_req_msg *req_msg) 1627 { 1628 return ((cpu_to_be16( 1629 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg))) || 1630 (ib_is_opa_gid(IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, 1631 req_msg)))); 1632 } 1633 1634 static void cm_path_set_rec_type(struct ib_device *ib_device, u8 port_num, 1635 struct sa_path_rec *path, union ib_gid *gid) 1636 { 1637 if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num)) 1638 path->rec_type = SA_PATH_REC_TYPE_OPA; 1639 else 1640 path->rec_type = SA_PATH_REC_TYPE_IB; 1641 } 1642 1643 static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg, 1644 struct sa_path_rec *primary_path, 1645 struct sa_path_rec *alt_path) 1646 { 1647 u32 lid; 1648 1649 if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) { 1650 sa_path_set_dlid(primary_path, 1651 IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID, 1652 req_msg)); 1653 sa_path_set_slid(primary_path, 1654 IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID, 1655 req_msg)); 1656 } else { 1657 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1658 CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg)); 1659 sa_path_set_dlid(primary_path, lid); 1660 1661 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1662 CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg)); 1663 sa_path_set_slid(primary_path, lid); 1664 } 1665 1666 if (!cm_req_has_alt_path(req_msg)) 1667 return; 1668 1669 if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) { 1670 sa_path_set_dlid(alt_path, 1671 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, 1672 req_msg)); 1673 sa_path_set_slid(alt_path, 1674 IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, 1675 req_msg)); 1676 } else { 1677 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1678 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg)); 1679 sa_path_set_dlid(alt_path, lid); 1680 1681 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1682 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg)); 1683 sa_path_set_slid(alt_path, lid); 1684 } 1685 } 1686 1687 static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1688 struct sa_path_rec *primary_path, 1689 struct sa_path_rec *alt_path) 1690 { 1691 primary_path->dgid = 1692 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg); 1693 primary_path->sgid = 1694 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg); 1695 primary_path->flow_label = 1696 cpu_to_be32(IBA_GET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg)); 1697 primary_path->hop_limit = IBA_GET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg); 1698 primary_path->traffic_class = 1699 IBA_GET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg); 1700 primary_path->reversible = 1; 1701 primary_path->pkey = 1702 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 1703 primary_path->sl = IBA_GET(CM_REQ_PRIMARY_SL, req_msg); 1704 primary_path->mtu_selector = IB_SA_EQ; 1705 primary_path->mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 1706 primary_path->rate_selector = IB_SA_EQ; 1707 primary_path->rate = IBA_GET(CM_REQ_PRIMARY_PACKET_RATE, req_msg); 1708 primary_path->packet_life_time_selector = IB_SA_EQ; 1709 primary_path->packet_life_time = 1710 IBA_GET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg); 1711 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1712 primary_path->service_id = 1713 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 1714 if (sa_path_is_roce(primary_path)) 1715 primary_path->roce.route_resolved = false; 1716 1717 if (cm_req_has_alt_path(req_msg)) { 1718 alt_path->dgid = *IBA_GET_MEM_PTR( 1719 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg); 1720 alt_path->sgid = *IBA_GET_MEM_PTR( 1721 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg); 1722 alt_path->flow_label = cpu_to_be32( 1723 IBA_GET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg)); 1724 alt_path->hop_limit = 1725 IBA_GET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg); 1726 alt_path->traffic_class = 1727 IBA_GET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg); 1728 alt_path->reversible = 1; 1729 alt_path->pkey = 1730 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 1731 alt_path->sl = IBA_GET(CM_REQ_ALTERNATE_SL, req_msg); 1732 alt_path->mtu_selector = IB_SA_EQ; 1733 alt_path->mtu = 1734 IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 1735 alt_path->rate_selector = IB_SA_EQ; 1736 alt_path->rate = IBA_GET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg); 1737 alt_path->packet_life_time_selector = IB_SA_EQ; 1738 alt_path->packet_life_time = 1739 IBA_GET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg); 1740 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1741 alt_path->service_id = 1742 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 1743 1744 if (sa_path_is_roce(alt_path)) 1745 alt_path->roce.route_resolved = false; 1746 } 1747 cm_format_path_lid_from_req(req_msg, primary_path, alt_path); 1748 } 1749 1750 static u16 cm_get_bth_pkey(struct cm_work *work) 1751 { 1752 struct ib_device *ib_dev = work->port->cm_dev->ib_device; 1753 u8 port_num = work->port->port_num; 1754 u16 pkey_index = work->mad_recv_wc->wc->pkey_index; 1755 u16 pkey; 1756 int ret; 1757 1758 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey); 1759 if (ret) { 1760 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n", 1761 port_num, pkey_index, ret); 1762 return 0; 1763 } 1764 1765 return pkey; 1766 } 1767 1768 /** 1769 * cm_opa_to_ib_sgid - Convert OPA SGID to IB SGID 1770 * ULPs (such as IPoIB) do not understand OPA GIDs and will 1771 * reject them as the local_gid will not match the sgid. Therefore, 1772 * change the pathrec's SGID to an IB SGID. 1773 * 1774 * @work: Work completion 1775 * @path: Path record 1776 */ 1777 static void cm_opa_to_ib_sgid(struct cm_work *work, 1778 struct sa_path_rec *path) 1779 { 1780 struct ib_device *dev = work->port->cm_dev->ib_device; 1781 u8 port_num = work->port->port_num; 1782 1783 if (rdma_cap_opa_ah(dev, port_num) && 1784 (ib_is_opa_gid(&path->sgid))) { 1785 union ib_gid sgid; 1786 1787 if (rdma_query_gid(dev, port_num, 0, &sgid)) { 1788 dev_warn(&dev->dev, 1789 "Error updating sgid in CM request\n"); 1790 return; 1791 } 1792 1793 path->sgid = sgid; 1794 } 1795 } 1796 1797 static void cm_format_req_event(struct cm_work *work, 1798 struct cm_id_private *cm_id_priv, 1799 struct ib_cm_id *listen_id) 1800 { 1801 struct cm_req_msg *req_msg; 1802 struct ib_cm_req_event_param *param; 1803 1804 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1805 param = &work->cm_event.param.req_rcvd; 1806 param->listen_id = listen_id; 1807 param->bth_pkey = cm_get_bth_pkey(work); 1808 param->port = cm_id_priv->av.port->port_num; 1809 param->primary_path = &work->path[0]; 1810 cm_opa_to_ib_sgid(work, param->primary_path); 1811 if (cm_req_has_alt_path(req_msg)) { 1812 param->alternate_path = &work->path[1]; 1813 cm_opa_to_ib_sgid(work, param->alternate_path); 1814 } else { 1815 param->alternate_path = NULL; 1816 } 1817 param->remote_ca_guid = 1818 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg)); 1819 param->remote_qkey = IBA_GET(CM_REQ_LOCAL_Q_KEY, req_msg); 1820 param->remote_qpn = IBA_GET(CM_REQ_LOCAL_QPN, req_msg); 1821 param->qp_type = cm_req_get_qp_type(req_msg); 1822 param->starting_psn = IBA_GET(CM_REQ_STARTING_PSN, req_msg); 1823 param->responder_resources = IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg); 1824 param->initiator_depth = IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg); 1825 param->local_cm_response_timeout = 1826 IBA_GET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg); 1827 param->flow_control = IBA_GET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg); 1828 param->remote_cm_response_timeout = 1829 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg); 1830 param->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg); 1831 param->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg); 1832 param->srq = IBA_GET(CM_REQ_SRQ, req_msg); 1833 param->ppath_sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr; 1834 param->ece.vendor_id = IBA_GET(CM_REQ_VENDOR_ID, req_msg); 1835 param->ece.attr_mod = be32_to_cpu(req_msg->hdr.attr_mod); 1836 1837 work->cm_event.private_data = 1838 IBA_GET_MEM_PTR(CM_REQ_PRIVATE_DATA, req_msg); 1839 } 1840 1841 static void cm_process_work(struct cm_id_private *cm_id_priv, 1842 struct cm_work *work) 1843 { 1844 int ret; 1845 1846 /* We will typically only have the current event to report. */ 1847 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1848 cm_free_work(work); 1849 1850 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1851 spin_lock_irq(&cm_id_priv->lock); 1852 work = cm_dequeue_work(cm_id_priv); 1853 spin_unlock_irq(&cm_id_priv->lock); 1854 if (!work) 1855 return; 1856 1857 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1858 &work->cm_event); 1859 cm_free_work(work); 1860 } 1861 cm_deref_id(cm_id_priv); 1862 if (ret) 1863 cm_destroy_id(&cm_id_priv->id, ret); 1864 } 1865 1866 static void cm_format_mra(struct cm_mra_msg *mra_msg, 1867 struct cm_id_private *cm_id_priv, 1868 enum cm_msg_response msg_mraed, u8 service_timeout, 1869 const void *private_data, u8 private_data_len) 1870 { 1871 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1872 IBA_SET(CM_MRA_MESSAGE_MRAED, mra_msg, msg_mraed); 1873 IBA_SET(CM_MRA_LOCAL_COMM_ID, mra_msg, 1874 be32_to_cpu(cm_id_priv->id.local_id)); 1875 IBA_SET(CM_MRA_REMOTE_COMM_ID, mra_msg, 1876 be32_to_cpu(cm_id_priv->id.remote_id)); 1877 IBA_SET(CM_MRA_SERVICE_TIMEOUT, mra_msg, service_timeout); 1878 1879 if (private_data && private_data_len) 1880 IBA_SET_MEM(CM_MRA_PRIVATE_DATA, mra_msg, private_data, 1881 private_data_len); 1882 } 1883 1884 static void cm_format_rej(struct cm_rej_msg *rej_msg, 1885 struct cm_id_private *cm_id_priv, 1886 enum ib_cm_rej_reason reason, void *ari, 1887 u8 ari_length, const void *private_data, 1888 u8 private_data_len, enum ib_cm_state state) 1889 { 1890 lockdep_assert_held(&cm_id_priv->lock); 1891 1892 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1893 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg, 1894 be32_to_cpu(cm_id_priv->id.remote_id)); 1895 1896 switch (state) { 1897 case IB_CM_REQ_RCVD: 1898 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, be32_to_cpu(0)); 1899 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ); 1900 break; 1901 case IB_CM_MRA_REQ_SENT: 1902 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1903 be32_to_cpu(cm_id_priv->id.local_id)); 1904 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ); 1905 break; 1906 case IB_CM_REP_RCVD: 1907 case IB_CM_MRA_REP_SENT: 1908 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1909 be32_to_cpu(cm_id_priv->id.local_id)); 1910 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REP); 1911 break; 1912 default: 1913 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1914 be32_to_cpu(cm_id_priv->id.local_id)); 1915 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, 1916 CM_MSG_RESPONSE_OTHER); 1917 break; 1918 } 1919 1920 IBA_SET(CM_REJ_REASON, rej_msg, reason); 1921 if (ari && ari_length) { 1922 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length); 1923 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length); 1924 } 1925 1926 if (private_data && private_data_len) 1927 IBA_SET_MEM(CM_REJ_PRIVATE_DATA, rej_msg, private_data, 1928 private_data_len); 1929 } 1930 1931 static void cm_dup_req_handler(struct cm_work *work, 1932 struct cm_id_private *cm_id_priv) 1933 { 1934 struct ib_mad_send_buf *msg = NULL; 1935 int ret; 1936 1937 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1938 counter[CM_REQ_COUNTER]); 1939 1940 /* Quick state check to discard duplicate REQs. */ 1941 spin_lock_irq(&cm_id_priv->lock); 1942 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) { 1943 spin_unlock_irq(&cm_id_priv->lock); 1944 return; 1945 } 1946 spin_unlock_irq(&cm_id_priv->lock); 1947 1948 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1949 if (ret) 1950 return; 1951 1952 spin_lock_irq(&cm_id_priv->lock); 1953 switch (cm_id_priv->id.state) { 1954 case IB_CM_MRA_REQ_SENT: 1955 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1956 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1957 cm_id_priv->private_data, 1958 cm_id_priv->private_data_len); 1959 break; 1960 case IB_CM_TIMEWAIT: 1961 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, 1962 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0, 1963 IB_CM_TIMEWAIT); 1964 break; 1965 default: 1966 goto unlock; 1967 } 1968 spin_unlock_irq(&cm_id_priv->lock); 1969 1970 trace_icm_send_dup_req(&cm_id_priv->id); 1971 ret = ib_post_send_mad(msg, NULL); 1972 if (ret) 1973 goto free; 1974 return; 1975 1976 unlock: spin_unlock_irq(&cm_id_priv->lock); 1977 free: cm_free_msg(msg); 1978 } 1979 1980 static struct cm_id_private * cm_match_req(struct cm_work *work, 1981 struct cm_id_private *cm_id_priv) 1982 { 1983 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1984 struct cm_timewait_info *timewait_info; 1985 struct cm_req_msg *req_msg; 1986 1987 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1988 1989 /* Check for possible duplicate REQ. */ 1990 spin_lock_irq(&cm.lock); 1991 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1992 if (timewait_info) { 1993 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 1994 timewait_info->work.remote_id); 1995 spin_unlock_irq(&cm.lock); 1996 if (cur_cm_id_priv) { 1997 cm_dup_req_handler(work, cur_cm_id_priv); 1998 cm_deref_id(cur_cm_id_priv); 1999 } 2000 return NULL; 2001 } 2002 2003 /* Check for stale connections. */ 2004 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 2005 if (timewait_info) { 2006 cm_remove_remote(cm_id_priv); 2007 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2008 timewait_info->work.remote_id); 2009 2010 spin_unlock_irq(&cm.lock); 2011 cm_issue_rej(work->port, work->mad_recv_wc, 2012 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 2013 NULL, 0); 2014 if (cur_cm_id_priv) { 2015 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0); 2016 cm_deref_id(cur_cm_id_priv); 2017 } 2018 return NULL; 2019 } 2020 2021 /* Find matching listen request. */ 2022 listen_cm_id_priv = cm_find_listen( 2023 cm_id_priv->id.device, 2024 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg))); 2025 if (!listen_cm_id_priv) { 2026 cm_remove_remote(cm_id_priv); 2027 spin_unlock_irq(&cm.lock); 2028 cm_issue_rej(work->port, work->mad_recv_wc, 2029 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 2030 NULL, 0); 2031 return NULL; 2032 } 2033 spin_unlock_irq(&cm.lock); 2034 return listen_cm_id_priv; 2035 } 2036 2037 /* 2038 * Work-around for inter-subnet connections. If the LIDs are permissive, 2039 * we need to override the LID/SL data in the REQ with the LID information 2040 * in the work completion. 2041 */ 2042 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 2043 { 2044 if (!IBA_GET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg)) { 2045 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID, 2046 req_msg)) == IB_LID_PERMISSIVE) { 2047 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 2048 be16_to_cpu(ib_lid_be16(wc->slid))); 2049 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, wc->sl); 2050 } 2051 2052 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID, 2053 req_msg)) == IB_LID_PERMISSIVE) 2054 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, 2055 wc->dlid_path_bits); 2056 } 2057 2058 if (!IBA_GET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg)) { 2059 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, 2060 req_msg)) == IB_LID_PERMISSIVE) { 2061 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, 2062 be16_to_cpu(ib_lid_be16(wc->slid))); 2063 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, wc->sl); 2064 } 2065 2066 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, 2067 req_msg)) == IB_LID_PERMISSIVE) 2068 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, 2069 wc->dlid_path_bits); 2070 } 2071 } 2072 2073 static int cm_req_handler(struct cm_work *work) 2074 { 2075 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 2076 struct cm_req_msg *req_msg; 2077 const struct ib_global_route *grh; 2078 const struct ib_gid_attr *gid_attr; 2079 int ret; 2080 2081 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 2082 2083 cm_id_priv = 2084 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL); 2085 if (IS_ERR(cm_id_priv)) 2086 return PTR_ERR(cm_id_priv); 2087 2088 cm_id_priv->id.remote_id = 2089 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_COMM_ID, req_msg)); 2090 cm_id_priv->id.service_id = 2091 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 2092 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 2093 cm_id_priv->tid = req_msg->hdr.tid; 2094 cm_id_priv->timeout_ms = cm_convert_to_ms( 2095 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg)); 2096 cm_id_priv->max_cm_retries = IBA_GET(CM_REQ_MAX_CM_RETRIES, req_msg); 2097 cm_id_priv->remote_qpn = 2098 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg)); 2099 cm_id_priv->initiator_depth = 2100 IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg); 2101 cm_id_priv->responder_resources = 2102 IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg); 2103 cm_id_priv->path_mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 2104 cm_id_priv->pkey = cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 2105 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg)); 2106 cm_id_priv->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg); 2107 cm_id_priv->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg); 2108 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 2109 2110 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2111 work->mad_recv_wc->recv_buf.grh, 2112 &cm_id_priv->av); 2113 if (ret) 2114 goto destroy; 2115 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 2116 id.local_id); 2117 if (IS_ERR(cm_id_priv->timewait_info)) { 2118 ret = PTR_ERR(cm_id_priv->timewait_info); 2119 cm_id_priv->timewait_info = NULL; 2120 goto destroy; 2121 } 2122 cm_id_priv->timewait_info->work.remote_id = cm_id_priv->id.remote_id; 2123 cm_id_priv->timewait_info->remote_ca_guid = 2124 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg)); 2125 cm_id_priv->timewait_info->remote_qpn = cm_id_priv->remote_qpn; 2126 2127 /* 2128 * Note that the ID pointer is not in the xarray at this point, 2129 * so this set is only visible to the local thread. 2130 */ 2131 cm_id_priv->id.state = IB_CM_REQ_RCVD; 2132 2133 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 2134 if (!listen_cm_id_priv) { 2135 trace_icm_no_listener_err(&cm_id_priv->id); 2136 cm_id_priv->id.state = IB_CM_IDLE; 2137 ret = -EINVAL; 2138 goto destroy; 2139 } 2140 2141 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 2142 2143 memset(&work->path[0], 0, sizeof(work->path[0])); 2144 if (cm_req_has_alt_path(req_msg)) 2145 memset(&work->path[1], 0, sizeof(work->path[1])); 2146 grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr); 2147 gid_attr = grh->sgid_attr; 2148 2149 if (gid_attr && 2150 rdma_protocol_roce(work->port->cm_dev->ib_device, 2151 work->port->port_num)) { 2152 work->path[0].rec_type = 2153 sa_conv_gid_to_pathrec_type(gid_attr->gid_type); 2154 } else { 2155 cm_path_set_rec_type( 2156 work->port->cm_dev->ib_device, work->port->port_num, 2157 &work->path[0], 2158 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, 2159 req_msg)); 2160 } 2161 if (cm_req_has_alt_path(req_msg)) 2162 work->path[1].rec_type = work->path[0].rec_type; 2163 cm_format_paths_from_req(req_msg, &work->path[0], 2164 &work->path[1]); 2165 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE) 2166 sa_path_set_dmac(&work->path[0], 2167 cm_id_priv->av.ah_attr.roce.dmac); 2168 work->path[0].hop_limit = grh->hop_limit; 2169 ret = cm_init_av_by_path(&work->path[0], gid_attr, &cm_id_priv->av, 2170 cm_id_priv); 2171 if (ret) { 2172 int err; 2173 2174 err = rdma_query_gid(work->port->cm_dev->ib_device, 2175 work->port->port_num, 0, 2176 &work->path[0].sgid); 2177 if (err) 2178 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID, 2179 NULL, 0, NULL, 0); 2180 else 2181 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID, 2182 &work->path[0].sgid, 2183 sizeof(work->path[0].sgid), 2184 NULL, 0); 2185 goto rejected; 2186 } 2187 if (cm_req_has_alt_path(req_msg)) { 2188 ret = cm_init_av_by_path(&work->path[1], NULL, 2189 &cm_id_priv->alt_av, cm_id_priv); 2190 if (ret) { 2191 ib_send_cm_rej(&cm_id_priv->id, 2192 IB_CM_REJ_INVALID_ALT_GID, 2193 &work->path[0].sgid, 2194 sizeof(work->path[0].sgid), NULL, 0); 2195 goto rejected; 2196 } 2197 } 2198 2199 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 2200 cm_id_priv->id.context = listen_cm_id_priv->id.context; 2201 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 2202 2203 /* Now MAD handlers can see the new ID */ 2204 spin_lock_irq(&cm_id_priv->lock); 2205 cm_finalize_id(cm_id_priv); 2206 2207 /* Refcount belongs to the event, pairs with cm_process_work() */ 2208 refcount_inc(&cm_id_priv->refcount); 2209 cm_queue_work_unlock(cm_id_priv, work); 2210 /* 2211 * Since this ID was just created and was not made visible to other MAD 2212 * handlers until the cm_finalize_id() above we know that the 2213 * cm_process_work() will deliver the event and the listen_cm_id 2214 * embedded in the event can be derefed here. 2215 */ 2216 cm_deref_id(listen_cm_id_priv); 2217 return 0; 2218 2219 rejected: 2220 cm_deref_id(listen_cm_id_priv); 2221 destroy: 2222 ib_destroy_cm_id(&cm_id_priv->id); 2223 return ret; 2224 } 2225 2226 static void cm_format_rep(struct cm_rep_msg *rep_msg, 2227 struct cm_id_private *cm_id_priv, 2228 struct ib_cm_rep_param *param) 2229 { 2230 cm_format_mad_ece_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid, 2231 param->ece.attr_mod); 2232 IBA_SET(CM_REP_LOCAL_COMM_ID, rep_msg, 2233 be32_to_cpu(cm_id_priv->id.local_id)); 2234 IBA_SET(CM_REP_REMOTE_COMM_ID, rep_msg, 2235 be32_to_cpu(cm_id_priv->id.remote_id)); 2236 IBA_SET(CM_REP_STARTING_PSN, rep_msg, param->starting_psn); 2237 IBA_SET(CM_REP_RESPONDER_RESOURCES, rep_msg, 2238 param->responder_resources); 2239 IBA_SET(CM_REP_TARGET_ACK_DELAY, rep_msg, 2240 cm_id_priv->av.port->cm_dev->ack_delay); 2241 IBA_SET(CM_REP_FAILOVER_ACCEPTED, rep_msg, param->failover_accepted); 2242 IBA_SET(CM_REP_RNR_RETRY_COUNT, rep_msg, param->rnr_retry_count); 2243 IBA_SET(CM_REP_LOCAL_CA_GUID, rep_msg, 2244 be64_to_cpu(cm_id_priv->id.device->node_guid)); 2245 2246 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) { 2247 IBA_SET(CM_REP_INITIATOR_DEPTH, rep_msg, 2248 param->initiator_depth); 2249 IBA_SET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg, 2250 param->flow_control); 2251 IBA_SET(CM_REP_SRQ, rep_msg, param->srq); 2252 IBA_SET(CM_REP_LOCAL_QPN, rep_msg, param->qp_num); 2253 } else { 2254 IBA_SET(CM_REP_SRQ, rep_msg, 1); 2255 IBA_SET(CM_REP_LOCAL_EE_CONTEXT_NUMBER, rep_msg, param->qp_num); 2256 } 2257 2258 IBA_SET(CM_REP_VENDOR_ID_L, rep_msg, param->ece.vendor_id); 2259 IBA_SET(CM_REP_VENDOR_ID_M, rep_msg, param->ece.vendor_id >> 8); 2260 IBA_SET(CM_REP_VENDOR_ID_H, rep_msg, param->ece.vendor_id >> 16); 2261 2262 if (param->private_data && param->private_data_len) 2263 IBA_SET_MEM(CM_REP_PRIVATE_DATA, rep_msg, param->private_data, 2264 param->private_data_len); 2265 } 2266 2267 int ib_send_cm_rep(struct ib_cm_id *cm_id, 2268 struct ib_cm_rep_param *param) 2269 { 2270 struct cm_id_private *cm_id_priv; 2271 struct ib_mad_send_buf *msg; 2272 struct cm_rep_msg *rep_msg; 2273 unsigned long flags; 2274 int ret; 2275 2276 if (param->private_data && 2277 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 2278 return -EINVAL; 2279 2280 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2281 spin_lock_irqsave(&cm_id_priv->lock, flags); 2282 if (cm_id->state != IB_CM_REQ_RCVD && 2283 cm_id->state != IB_CM_MRA_REQ_SENT) { 2284 trace_icm_send_rep_err(cm_id_priv->id.local_id, cm_id->state); 2285 ret = -EINVAL; 2286 goto out; 2287 } 2288 2289 ret = cm_alloc_msg(cm_id_priv, &msg); 2290 if (ret) 2291 goto out; 2292 2293 rep_msg = (struct cm_rep_msg *) msg->mad; 2294 cm_format_rep(rep_msg, cm_id_priv, param); 2295 msg->timeout_ms = cm_id_priv->timeout_ms; 2296 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 2297 2298 trace_icm_send_rep(cm_id); 2299 ret = ib_post_send_mad(msg, NULL); 2300 if (ret) { 2301 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2302 cm_free_msg(msg); 2303 return ret; 2304 } 2305 2306 cm_id->state = IB_CM_REP_SENT; 2307 cm_id_priv->msg = msg; 2308 cm_id_priv->initiator_depth = param->initiator_depth; 2309 cm_id_priv->responder_resources = param->responder_resources; 2310 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg)); 2311 WARN_ONCE(param->qp_num & 0xFF000000, 2312 "IBTA declares QPN to be 24 bits, but it is 0x%X\n", 2313 param->qp_num); 2314 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF); 2315 2316 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2317 return ret; 2318 } 2319 EXPORT_SYMBOL(ib_send_cm_rep); 2320 2321 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 2322 struct cm_id_private *cm_id_priv, 2323 const void *private_data, 2324 u8 private_data_len) 2325 { 2326 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 2327 IBA_SET(CM_RTU_LOCAL_COMM_ID, rtu_msg, 2328 be32_to_cpu(cm_id_priv->id.local_id)); 2329 IBA_SET(CM_RTU_REMOTE_COMM_ID, rtu_msg, 2330 be32_to_cpu(cm_id_priv->id.remote_id)); 2331 2332 if (private_data && private_data_len) 2333 IBA_SET_MEM(CM_RTU_PRIVATE_DATA, rtu_msg, private_data, 2334 private_data_len); 2335 } 2336 2337 int ib_send_cm_rtu(struct ib_cm_id *cm_id, 2338 const void *private_data, 2339 u8 private_data_len) 2340 { 2341 struct cm_id_private *cm_id_priv; 2342 struct ib_mad_send_buf *msg; 2343 unsigned long flags; 2344 void *data; 2345 int ret; 2346 2347 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 2348 return -EINVAL; 2349 2350 data = cm_copy_private_data(private_data, private_data_len); 2351 if (IS_ERR(data)) 2352 return PTR_ERR(data); 2353 2354 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2355 spin_lock_irqsave(&cm_id_priv->lock, flags); 2356 if (cm_id->state != IB_CM_REP_RCVD && 2357 cm_id->state != IB_CM_MRA_REP_SENT) { 2358 trace_icm_send_cm_rtu_err(cm_id); 2359 ret = -EINVAL; 2360 goto error; 2361 } 2362 2363 ret = cm_alloc_msg(cm_id_priv, &msg); 2364 if (ret) 2365 goto error; 2366 2367 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 2368 private_data, private_data_len); 2369 2370 trace_icm_send_rtu(cm_id); 2371 ret = ib_post_send_mad(msg, NULL); 2372 if (ret) { 2373 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2374 cm_free_msg(msg); 2375 kfree(data); 2376 return ret; 2377 } 2378 2379 cm_id->state = IB_CM_ESTABLISHED; 2380 cm_set_private_data(cm_id_priv, data, private_data_len); 2381 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2382 return 0; 2383 2384 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2385 kfree(data); 2386 return ret; 2387 } 2388 EXPORT_SYMBOL(ib_send_cm_rtu); 2389 2390 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type) 2391 { 2392 struct cm_rep_msg *rep_msg; 2393 struct ib_cm_rep_event_param *param; 2394 2395 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 2396 param = &work->cm_event.param.rep_rcvd; 2397 param->remote_ca_guid = 2398 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg)); 2399 param->remote_qkey = IBA_GET(CM_REP_LOCAL_Q_KEY, rep_msg); 2400 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type)); 2401 param->starting_psn = IBA_GET(CM_REP_STARTING_PSN, rep_msg); 2402 param->responder_resources = IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg); 2403 param->initiator_depth = IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg); 2404 param->target_ack_delay = IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg); 2405 param->failover_accepted = IBA_GET(CM_REP_FAILOVER_ACCEPTED, rep_msg); 2406 param->flow_control = IBA_GET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg); 2407 param->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg); 2408 param->srq = IBA_GET(CM_REP_SRQ, rep_msg); 2409 param->ece.vendor_id = IBA_GET(CM_REP_VENDOR_ID_H, rep_msg) << 16; 2410 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_M, rep_msg) << 8; 2411 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_L, rep_msg); 2412 param->ece.attr_mod = be32_to_cpu(rep_msg->hdr.attr_mod); 2413 2414 work->cm_event.private_data = 2415 IBA_GET_MEM_PTR(CM_REP_PRIVATE_DATA, rep_msg); 2416 } 2417 2418 static void cm_dup_rep_handler(struct cm_work *work) 2419 { 2420 struct cm_id_private *cm_id_priv; 2421 struct cm_rep_msg *rep_msg; 2422 struct ib_mad_send_buf *msg = NULL; 2423 int ret; 2424 2425 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 2426 cm_id_priv = cm_acquire_id( 2427 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 2428 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg))); 2429 if (!cm_id_priv) 2430 return; 2431 2432 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2433 counter[CM_REP_COUNTER]); 2434 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 2435 if (ret) 2436 goto deref; 2437 2438 spin_lock_irq(&cm_id_priv->lock); 2439 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 2440 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 2441 cm_id_priv->private_data, 2442 cm_id_priv->private_data_len); 2443 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 2444 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2445 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 2446 cm_id_priv->private_data, 2447 cm_id_priv->private_data_len); 2448 else 2449 goto unlock; 2450 spin_unlock_irq(&cm_id_priv->lock); 2451 2452 trace_icm_send_dup_rep(&cm_id_priv->id); 2453 ret = ib_post_send_mad(msg, NULL); 2454 if (ret) 2455 goto free; 2456 goto deref; 2457 2458 unlock: spin_unlock_irq(&cm_id_priv->lock); 2459 free: cm_free_msg(msg); 2460 deref: cm_deref_id(cm_id_priv); 2461 } 2462 2463 static int cm_rep_handler(struct cm_work *work) 2464 { 2465 struct cm_id_private *cm_id_priv; 2466 struct cm_rep_msg *rep_msg; 2467 int ret; 2468 struct cm_id_private *cur_cm_id_priv; 2469 struct cm_timewait_info *timewait_info; 2470 2471 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 2472 cm_id_priv = cm_acquire_id( 2473 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 0); 2474 if (!cm_id_priv) { 2475 cm_dup_rep_handler(work); 2476 trace_icm_remote_no_priv_err( 2477 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2478 return -EINVAL; 2479 } 2480 2481 cm_format_rep_event(work, cm_id_priv->qp_type); 2482 2483 spin_lock_irq(&cm_id_priv->lock); 2484 switch (cm_id_priv->id.state) { 2485 case IB_CM_REQ_SENT: 2486 case IB_CM_MRA_REQ_RCVD: 2487 break; 2488 default: 2489 ret = -EINVAL; 2490 trace_icm_rep_unknown_err( 2491 IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg), 2492 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg), 2493 cm_id_priv->id.state); 2494 spin_unlock_irq(&cm_id_priv->lock); 2495 goto error; 2496 } 2497 2498 cm_id_priv->timewait_info->work.remote_id = 2499 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)); 2500 cm_id_priv->timewait_info->remote_ca_guid = 2501 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg)); 2502 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2503 2504 spin_lock(&cm.lock); 2505 /* Check for duplicate REP. */ 2506 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 2507 spin_unlock(&cm.lock); 2508 spin_unlock_irq(&cm_id_priv->lock); 2509 ret = -EINVAL; 2510 trace_icm_insert_failed_err( 2511 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2512 goto error; 2513 } 2514 /* Check for a stale connection. */ 2515 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 2516 if (timewait_info) { 2517 cm_remove_remote(cm_id_priv); 2518 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2519 timewait_info->work.remote_id); 2520 2521 spin_unlock(&cm.lock); 2522 spin_unlock_irq(&cm_id_priv->lock); 2523 cm_issue_rej(work->port, work->mad_recv_wc, 2524 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 2525 NULL, 0); 2526 ret = -EINVAL; 2527 trace_icm_staleconn_err( 2528 IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg), 2529 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2530 2531 if (cur_cm_id_priv) { 2532 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0); 2533 cm_deref_id(cur_cm_id_priv); 2534 } 2535 2536 goto error; 2537 } 2538 spin_unlock(&cm.lock); 2539 2540 cm_id_priv->id.state = IB_CM_REP_RCVD; 2541 cm_id_priv->id.remote_id = 2542 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)); 2543 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2544 cm_id_priv->initiator_depth = 2545 IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg); 2546 cm_id_priv->responder_resources = 2547 IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg); 2548 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg)); 2549 cm_id_priv->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg); 2550 cm_id_priv->target_ack_delay = 2551 IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg); 2552 cm_id_priv->av.timeout = 2553 cm_ack_timeout(cm_id_priv->target_ack_delay, 2554 cm_id_priv->av.timeout - 1); 2555 cm_id_priv->alt_av.timeout = 2556 cm_ack_timeout(cm_id_priv->target_ack_delay, 2557 cm_id_priv->alt_av.timeout - 1); 2558 2559 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2560 cm_queue_work_unlock(cm_id_priv, work); 2561 return 0; 2562 2563 error: 2564 cm_deref_id(cm_id_priv); 2565 return ret; 2566 } 2567 2568 static int cm_establish_handler(struct cm_work *work) 2569 { 2570 struct cm_id_private *cm_id_priv; 2571 2572 /* See comment in cm_establish about lookup. */ 2573 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 2574 if (!cm_id_priv) 2575 return -EINVAL; 2576 2577 spin_lock_irq(&cm_id_priv->lock); 2578 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 2579 spin_unlock_irq(&cm_id_priv->lock); 2580 goto out; 2581 } 2582 2583 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2584 cm_queue_work_unlock(cm_id_priv, work); 2585 return 0; 2586 out: 2587 cm_deref_id(cm_id_priv); 2588 return -EINVAL; 2589 } 2590 2591 static int cm_rtu_handler(struct cm_work *work) 2592 { 2593 struct cm_id_private *cm_id_priv; 2594 struct cm_rtu_msg *rtu_msg; 2595 2596 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 2597 cm_id_priv = cm_acquire_id( 2598 cpu_to_be32(IBA_GET(CM_RTU_REMOTE_COMM_ID, rtu_msg)), 2599 cpu_to_be32(IBA_GET(CM_RTU_LOCAL_COMM_ID, rtu_msg))); 2600 if (!cm_id_priv) 2601 return -EINVAL; 2602 2603 work->cm_event.private_data = 2604 IBA_GET_MEM_PTR(CM_RTU_PRIVATE_DATA, rtu_msg); 2605 2606 spin_lock_irq(&cm_id_priv->lock); 2607 if (cm_id_priv->id.state != IB_CM_REP_SENT && 2608 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 2609 spin_unlock_irq(&cm_id_priv->lock); 2610 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2611 counter[CM_RTU_COUNTER]); 2612 goto out; 2613 } 2614 cm_id_priv->id.state = IB_CM_ESTABLISHED; 2615 2616 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2617 cm_queue_work_unlock(cm_id_priv, work); 2618 return 0; 2619 out: 2620 cm_deref_id(cm_id_priv); 2621 return -EINVAL; 2622 } 2623 2624 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 2625 struct cm_id_private *cm_id_priv, 2626 const void *private_data, 2627 u8 private_data_len) 2628 { 2629 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 2630 cm_form_tid(cm_id_priv)); 2631 IBA_SET(CM_DREQ_LOCAL_COMM_ID, dreq_msg, 2632 be32_to_cpu(cm_id_priv->id.local_id)); 2633 IBA_SET(CM_DREQ_REMOTE_COMM_ID, dreq_msg, 2634 be32_to_cpu(cm_id_priv->id.remote_id)); 2635 IBA_SET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg, 2636 be32_to_cpu(cm_id_priv->remote_qpn)); 2637 2638 if (private_data && private_data_len) 2639 IBA_SET_MEM(CM_DREQ_PRIVATE_DATA, dreq_msg, private_data, 2640 private_data_len); 2641 } 2642 2643 static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv, 2644 const void *private_data, u8 private_data_len) 2645 { 2646 struct ib_mad_send_buf *msg; 2647 int ret; 2648 2649 lockdep_assert_held(&cm_id_priv->lock); 2650 2651 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 2652 return -EINVAL; 2653 2654 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 2655 trace_icm_dreq_skipped(&cm_id_priv->id); 2656 return -EINVAL; 2657 } 2658 2659 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2660 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2661 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2662 2663 ret = cm_alloc_msg(cm_id_priv, &msg); 2664 if (ret) { 2665 cm_enter_timewait(cm_id_priv); 2666 return ret; 2667 } 2668 2669 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 2670 private_data, private_data_len); 2671 msg->timeout_ms = cm_id_priv->timeout_ms; 2672 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2673 2674 trace_icm_send_dreq(&cm_id_priv->id); 2675 ret = ib_post_send_mad(msg, NULL); 2676 if (ret) { 2677 cm_enter_timewait(cm_id_priv); 2678 cm_free_msg(msg); 2679 return ret; 2680 } 2681 2682 cm_id_priv->id.state = IB_CM_DREQ_SENT; 2683 cm_id_priv->msg = msg; 2684 return 0; 2685 } 2686 2687 int ib_send_cm_dreq(struct ib_cm_id *cm_id, const void *private_data, 2688 u8 private_data_len) 2689 { 2690 struct cm_id_private *cm_id_priv = 2691 container_of(cm_id, struct cm_id_private, id); 2692 unsigned long flags; 2693 int ret; 2694 2695 spin_lock_irqsave(&cm_id_priv->lock, flags); 2696 ret = cm_send_dreq_locked(cm_id_priv, private_data, private_data_len); 2697 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2698 return ret; 2699 } 2700 EXPORT_SYMBOL(ib_send_cm_dreq); 2701 2702 static void cm_format_drep(struct cm_drep_msg *drep_msg, 2703 struct cm_id_private *cm_id_priv, 2704 const void *private_data, 2705 u8 private_data_len) 2706 { 2707 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2708 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg, 2709 be32_to_cpu(cm_id_priv->id.local_id)); 2710 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg, 2711 be32_to_cpu(cm_id_priv->id.remote_id)); 2712 2713 if (private_data && private_data_len) 2714 IBA_SET_MEM(CM_DREP_PRIVATE_DATA, drep_msg, private_data, 2715 private_data_len); 2716 } 2717 2718 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv, 2719 void *private_data, u8 private_data_len) 2720 { 2721 struct ib_mad_send_buf *msg; 2722 int ret; 2723 2724 lockdep_assert_held(&cm_id_priv->lock); 2725 2726 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2727 return -EINVAL; 2728 2729 if (cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2730 trace_icm_send_drep_err(&cm_id_priv->id); 2731 kfree(private_data); 2732 return -EINVAL; 2733 } 2734 2735 cm_set_private_data(cm_id_priv, private_data, private_data_len); 2736 cm_enter_timewait(cm_id_priv); 2737 2738 ret = cm_alloc_msg(cm_id_priv, &msg); 2739 if (ret) 2740 return ret; 2741 2742 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2743 private_data, private_data_len); 2744 2745 trace_icm_send_drep(&cm_id_priv->id); 2746 ret = ib_post_send_mad(msg, NULL); 2747 if (ret) { 2748 cm_free_msg(msg); 2749 return ret; 2750 } 2751 return 0; 2752 } 2753 2754 int ib_send_cm_drep(struct ib_cm_id *cm_id, const void *private_data, 2755 u8 private_data_len) 2756 { 2757 struct cm_id_private *cm_id_priv = 2758 container_of(cm_id, struct cm_id_private, id); 2759 unsigned long flags; 2760 void *data; 2761 int ret; 2762 2763 data = cm_copy_private_data(private_data, private_data_len); 2764 if (IS_ERR(data)) 2765 return PTR_ERR(data); 2766 2767 spin_lock_irqsave(&cm_id_priv->lock, flags); 2768 ret = cm_send_drep_locked(cm_id_priv, data, private_data_len); 2769 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2770 return ret; 2771 } 2772 EXPORT_SYMBOL(ib_send_cm_drep); 2773 2774 static int cm_issue_drep(struct cm_port *port, 2775 struct ib_mad_recv_wc *mad_recv_wc) 2776 { 2777 struct ib_mad_send_buf *msg = NULL; 2778 struct cm_dreq_msg *dreq_msg; 2779 struct cm_drep_msg *drep_msg; 2780 int ret; 2781 2782 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2783 if (ret) 2784 return ret; 2785 2786 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2787 drep_msg = (struct cm_drep_msg *) msg->mad; 2788 2789 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2790 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg, 2791 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg)); 2792 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg, 2793 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)); 2794 2795 trace_icm_issue_drep( 2796 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg), 2797 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)); 2798 ret = ib_post_send_mad(msg, NULL); 2799 if (ret) 2800 cm_free_msg(msg); 2801 2802 return ret; 2803 } 2804 2805 static int cm_dreq_handler(struct cm_work *work) 2806 { 2807 struct cm_id_private *cm_id_priv; 2808 struct cm_dreq_msg *dreq_msg; 2809 struct ib_mad_send_buf *msg = NULL; 2810 2811 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2812 cm_id_priv = cm_acquire_id( 2813 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)), 2814 cpu_to_be32(IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg))); 2815 if (!cm_id_priv) { 2816 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2817 counter[CM_DREQ_COUNTER]); 2818 cm_issue_drep(work->port, work->mad_recv_wc); 2819 trace_icm_no_priv_err( 2820 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg), 2821 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)); 2822 return -EINVAL; 2823 } 2824 2825 work->cm_event.private_data = 2826 IBA_GET_MEM_PTR(CM_DREQ_PRIVATE_DATA, dreq_msg); 2827 2828 spin_lock_irq(&cm_id_priv->lock); 2829 if (cm_id_priv->local_qpn != 2830 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg))) 2831 goto unlock; 2832 2833 switch (cm_id_priv->id.state) { 2834 case IB_CM_REP_SENT: 2835 case IB_CM_DREQ_SENT: 2836 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2837 break; 2838 case IB_CM_ESTABLISHED: 2839 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2840 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2841 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2842 break; 2843 case IB_CM_MRA_REP_RCVD: 2844 break; 2845 case IB_CM_TIMEWAIT: 2846 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2847 counter[CM_DREQ_COUNTER]); 2848 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc); 2849 if (IS_ERR(msg)) 2850 goto unlock; 2851 2852 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2853 cm_id_priv->private_data, 2854 cm_id_priv->private_data_len); 2855 spin_unlock_irq(&cm_id_priv->lock); 2856 2857 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || 2858 ib_post_send_mad(msg, NULL)) 2859 cm_free_msg(msg); 2860 goto deref; 2861 case IB_CM_DREQ_RCVD: 2862 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2863 counter[CM_DREQ_COUNTER]); 2864 goto unlock; 2865 default: 2866 trace_icm_dreq_unknown_err(&cm_id_priv->id); 2867 goto unlock; 2868 } 2869 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2870 cm_id_priv->tid = dreq_msg->hdr.tid; 2871 cm_queue_work_unlock(cm_id_priv, work); 2872 return 0; 2873 2874 unlock: spin_unlock_irq(&cm_id_priv->lock); 2875 deref: cm_deref_id(cm_id_priv); 2876 return -EINVAL; 2877 } 2878 2879 static int cm_drep_handler(struct cm_work *work) 2880 { 2881 struct cm_id_private *cm_id_priv; 2882 struct cm_drep_msg *drep_msg; 2883 2884 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2885 cm_id_priv = cm_acquire_id( 2886 cpu_to_be32(IBA_GET(CM_DREP_REMOTE_COMM_ID, drep_msg)), 2887 cpu_to_be32(IBA_GET(CM_DREP_LOCAL_COMM_ID, drep_msg))); 2888 if (!cm_id_priv) 2889 return -EINVAL; 2890 2891 work->cm_event.private_data = 2892 IBA_GET_MEM_PTR(CM_DREP_PRIVATE_DATA, drep_msg); 2893 2894 spin_lock_irq(&cm_id_priv->lock); 2895 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2896 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2897 spin_unlock_irq(&cm_id_priv->lock); 2898 goto out; 2899 } 2900 cm_enter_timewait(cm_id_priv); 2901 2902 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2903 cm_queue_work_unlock(cm_id_priv, work); 2904 return 0; 2905 out: 2906 cm_deref_id(cm_id_priv); 2907 return -EINVAL; 2908 } 2909 2910 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv, 2911 enum ib_cm_rej_reason reason, void *ari, 2912 u8 ari_length, const void *private_data, 2913 u8 private_data_len) 2914 { 2915 enum ib_cm_state state = cm_id_priv->id.state; 2916 struct ib_mad_send_buf *msg; 2917 int ret; 2918 2919 lockdep_assert_held(&cm_id_priv->lock); 2920 2921 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2922 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2923 return -EINVAL; 2924 2925 switch (state) { 2926 case IB_CM_REQ_SENT: 2927 case IB_CM_MRA_REQ_RCVD: 2928 case IB_CM_REQ_RCVD: 2929 case IB_CM_MRA_REQ_SENT: 2930 case IB_CM_REP_RCVD: 2931 case IB_CM_MRA_REP_SENT: 2932 cm_reset_to_idle(cm_id_priv); 2933 ret = cm_alloc_msg(cm_id_priv, &msg); 2934 if (ret) 2935 return ret; 2936 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason, 2937 ari, ari_length, private_data, private_data_len, 2938 state); 2939 break; 2940 case IB_CM_REP_SENT: 2941 case IB_CM_MRA_REP_RCVD: 2942 cm_enter_timewait(cm_id_priv); 2943 ret = cm_alloc_msg(cm_id_priv, &msg); 2944 if (ret) 2945 return ret; 2946 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason, 2947 ari, ari_length, private_data, private_data_len, 2948 state); 2949 break; 2950 default: 2951 trace_icm_send_unknown_rej_err(&cm_id_priv->id); 2952 return -EINVAL; 2953 } 2954 2955 trace_icm_send_rej(&cm_id_priv->id, reason); 2956 ret = ib_post_send_mad(msg, NULL); 2957 if (ret) { 2958 cm_free_msg(msg); 2959 return ret; 2960 } 2961 2962 return 0; 2963 } 2964 2965 int ib_send_cm_rej(struct ib_cm_id *cm_id, enum ib_cm_rej_reason reason, 2966 void *ari, u8 ari_length, const void *private_data, 2967 u8 private_data_len) 2968 { 2969 struct cm_id_private *cm_id_priv = 2970 container_of(cm_id, struct cm_id_private, id); 2971 unsigned long flags; 2972 int ret; 2973 2974 spin_lock_irqsave(&cm_id_priv->lock, flags); 2975 ret = cm_send_rej_locked(cm_id_priv, reason, ari, ari_length, 2976 private_data, private_data_len); 2977 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2978 return ret; 2979 } 2980 EXPORT_SYMBOL(ib_send_cm_rej); 2981 2982 static void cm_format_rej_event(struct cm_work *work) 2983 { 2984 struct cm_rej_msg *rej_msg; 2985 struct ib_cm_rej_event_param *param; 2986 2987 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2988 param = &work->cm_event.param.rej_rcvd; 2989 param->ari = IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg); 2990 param->ari_length = IBA_GET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg); 2991 param->reason = IBA_GET(CM_REJ_REASON, rej_msg); 2992 work->cm_event.private_data = 2993 IBA_GET_MEM_PTR(CM_REJ_PRIVATE_DATA, rej_msg); 2994 } 2995 2996 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2997 { 2998 struct cm_id_private *cm_id_priv; 2999 __be32 remote_id; 3000 3001 remote_id = cpu_to_be32(IBA_GET(CM_REJ_LOCAL_COMM_ID, rej_msg)); 3002 3003 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_TIMEOUT) { 3004 cm_id_priv = cm_find_remote_id( 3005 *((__be64 *)IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg)), 3006 remote_id); 3007 } else if (IBA_GET(CM_REJ_MESSAGE_REJECTED, rej_msg) == 3008 CM_MSG_RESPONSE_REQ) 3009 cm_id_priv = cm_acquire_id( 3010 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)), 3011 0); 3012 else 3013 cm_id_priv = cm_acquire_id( 3014 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)), 3015 remote_id); 3016 3017 return cm_id_priv; 3018 } 3019 3020 static int cm_rej_handler(struct cm_work *work) 3021 { 3022 struct cm_id_private *cm_id_priv; 3023 struct cm_rej_msg *rej_msg; 3024 3025 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 3026 cm_id_priv = cm_acquire_rejected_id(rej_msg); 3027 if (!cm_id_priv) 3028 return -EINVAL; 3029 3030 cm_format_rej_event(work); 3031 3032 spin_lock_irq(&cm_id_priv->lock); 3033 switch (cm_id_priv->id.state) { 3034 case IB_CM_REQ_SENT: 3035 case IB_CM_MRA_REQ_RCVD: 3036 case IB_CM_REP_SENT: 3037 case IB_CM_MRA_REP_RCVD: 3038 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3039 fallthrough; 3040 case IB_CM_REQ_RCVD: 3041 case IB_CM_MRA_REQ_SENT: 3042 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_STALE_CONN) 3043 cm_enter_timewait(cm_id_priv); 3044 else 3045 cm_reset_to_idle(cm_id_priv); 3046 break; 3047 case IB_CM_DREQ_SENT: 3048 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3049 fallthrough; 3050 case IB_CM_REP_RCVD: 3051 case IB_CM_MRA_REP_SENT: 3052 cm_enter_timewait(cm_id_priv); 3053 break; 3054 case IB_CM_ESTABLISHED: 3055 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT || 3056 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) { 3057 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT) 3058 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 3059 cm_id_priv->msg); 3060 cm_enter_timewait(cm_id_priv); 3061 break; 3062 } 3063 fallthrough; 3064 default: 3065 trace_icm_rej_unknown_err(&cm_id_priv->id); 3066 spin_unlock_irq(&cm_id_priv->lock); 3067 goto out; 3068 } 3069 3070 cm_queue_work_unlock(cm_id_priv, work); 3071 return 0; 3072 out: 3073 cm_deref_id(cm_id_priv); 3074 return -EINVAL; 3075 } 3076 3077 int ib_send_cm_mra(struct ib_cm_id *cm_id, 3078 u8 service_timeout, 3079 const void *private_data, 3080 u8 private_data_len) 3081 { 3082 struct cm_id_private *cm_id_priv; 3083 struct ib_mad_send_buf *msg; 3084 enum ib_cm_state cm_state; 3085 enum ib_cm_lap_state lap_state; 3086 enum cm_msg_response msg_response; 3087 void *data; 3088 unsigned long flags; 3089 int ret; 3090 3091 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 3092 return -EINVAL; 3093 3094 data = cm_copy_private_data(private_data, private_data_len); 3095 if (IS_ERR(data)) 3096 return PTR_ERR(data); 3097 3098 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3099 3100 spin_lock_irqsave(&cm_id_priv->lock, flags); 3101 switch(cm_id_priv->id.state) { 3102 case IB_CM_REQ_RCVD: 3103 cm_state = IB_CM_MRA_REQ_SENT; 3104 lap_state = cm_id->lap_state; 3105 msg_response = CM_MSG_RESPONSE_REQ; 3106 break; 3107 case IB_CM_REP_RCVD: 3108 cm_state = IB_CM_MRA_REP_SENT; 3109 lap_state = cm_id->lap_state; 3110 msg_response = CM_MSG_RESPONSE_REP; 3111 break; 3112 case IB_CM_ESTABLISHED: 3113 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 3114 cm_state = cm_id->state; 3115 lap_state = IB_CM_MRA_LAP_SENT; 3116 msg_response = CM_MSG_RESPONSE_OTHER; 3117 break; 3118 } 3119 fallthrough; 3120 default: 3121 trace_icm_send_mra_unknown_err(&cm_id_priv->id); 3122 ret = -EINVAL; 3123 goto error1; 3124 } 3125 3126 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 3127 ret = cm_alloc_msg(cm_id_priv, &msg); 3128 if (ret) 3129 goto error1; 3130 3131 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 3132 msg_response, service_timeout, 3133 private_data, private_data_len); 3134 trace_icm_send_mra(cm_id); 3135 ret = ib_post_send_mad(msg, NULL); 3136 if (ret) 3137 goto error2; 3138 } 3139 3140 cm_id->state = cm_state; 3141 cm_id->lap_state = lap_state; 3142 cm_id_priv->service_timeout = service_timeout; 3143 cm_set_private_data(cm_id_priv, data, private_data_len); 3144 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3145 return 0; 3146 3147 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3148 kfree(data); 3149 return ret; 3150 3151 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3152 kfree(data); 3153 cm_free_msg(msg); 3154 return ret; 3155 } 3156 EXPORT_SYMBOL(ib_send_cm_mra); 3157 3158 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 3159 { 3160 switch (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg)) { 3161 case CM_MSG_RESPONSE_REQ: 3162 return cm_acquire_id( 3163 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)), 3164 0); 3165 case CM_MSG_RESPONSE_REP: 3166 case CM_MSG_RESPONSE_OTHER: 3167 return cm_acquire_id( 3168 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)), 3169 cpu_to_be32(IBA_GET(CM_MRA_LOCAL_COMM_ID, mra_msg))); 3170 default: 3171 return NULL; 3172 } 3173 } 3174 3175 static int cm_mra_handler(struct cm_work *work) 3176 { 3177 struct cm_id_private *cm_id_priv; 3178 struct cm_mra_msg *mra_msg; 3179 int timeout; 3180 3181 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 3182 cm_id_priv = cm_acquire_mraed_id(mra_msg); 3183 if (!cm_id_priv) 3184 return -EINVAL; 3185 3186 work->cm_event.private_data = 3187 IBA_GET_MEM_PTR(CM_MRA_PRIVATE_DATA, mra_msg); 3188 work->cm_event.param.mra_rcvd.service_timeout = 3189 IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg); 3190 timeout = cm_convert_to_ms(IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg)) + 3191 cm_convert_to_ms(cm_id_priv->av.timeout); 3192 3193 spin_lock_irq(&cm_id_priv->lock); 3194 switch (cm_id_priv->id.state) { 3195 case IB_CM_REQ_SENT: 3196 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != 3197 CM_MSG_RESPONSE_REQ || 3198 ib_modify_mad(cm_id_priv->av.port->mad_agent, 3199 cm_id_priv->msg, timeout)) 3200 goto out; 3201 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 3202 break; 3203 case IB_CM_REP_SENT: 3204 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != 3205 CM_MSG_RESPONSE_REP || 3206 ib_modify_mad(cm_id_priv->av.port->mad_agent, 3207 cm_id_priv->msg, timeout)) 3208 goto out; 3209 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 3210 break; 3211 case IB_CM_ESTABLISHED: 3212 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != 3213 CM_MSG_RESPONSE_OTHER || 3214 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 3215 ib_modify_mad(cm_id_priv->av.port->mad_agent, 3216 cm_id_priv->msg, timeout)) { 3217 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 3218 atomic_long_inc(&work->port-> 3219 counter_group[CM_RECV_DUPLICATES]. 3220 counter[CM_MRA_COUNTER]); 3221 goto out; 3222 } 3223 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 3224 break; 3225 case IB_CM_MRA_REQ_RCVD: 3226 case IB_CM_MRA_REP_RCVD: 3227 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3228 counter[CM_MRA_COUNTER]); 3229 fallthrough; 3230 default: 3231 trace_icm_mra_unknown_err(&cm_id_priv->id); 3232 goto out; 3233 } 3234 3235 cm_id_priv->msg->context[1] = (void *) (unsigned long) 3236 cm_id_priv->id.state; 3237 cm_queue_work_unlock(cm_id_priv, work); 3238 return 0; 3239 out: 3240 spin_unlock_irq(&cm_id_priv->lock); 3241 cm_deref_id(cm_id_priv); 3242 return -EINVAL; 3243 } 3244 3245 static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg, 3246 struct sa_path_rec *path) 3247 { 3248 u32 lid; 3249 3250 if (path->rec_type != SA_PATH_REC_TYPE_OPA) { 3251 sa_path_set_dlid(path, IBA_GET(CM_LAP_ALTERNATE_LOCAL_PORT_LID, 3252 lap_msg)); 3253 sa_path_set_slid(path, IBA_GET(CM_LAP_ALTERNATE_REMOTE_PORT_LID, 3254 lap_msg)); 3255 } else { 3256 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 3257 CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg)); 3258 sa_path_set_dlid(path, lid); 3259 3260 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 3261 CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg)); 3262 sa_path_set_slid(path, lid); 3263 } 3264 } 3265 3266 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 3267 struct sa_path_rec *path, 3268 struct cm_lap_msg *lap_msg) 3269 { 3270 path->dgid = *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg); 3271 path->sgid = 3272 *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg); 3273 path->flow_label = 3274 cpu_to_be32(IBA_GET(CM_LAP_ALTERNATE_FLOW_LABEL, lap_msg)); 3275 path->hop_limit = IBA_GET(CM_LAP_ALTERNATE_HOP_LIMIT, lap_msg); 3276 path->traffic_class = IBA_GET(CM_LAP_ALTERNATE_TRAFFIC_CLASS, lap_msg); 3277 path->reversible = 1; 3278 path->pkey = cm_id_priv->pkey; 3279 path->sl = IBA_GET(CM_LAP_ALTERNATE_SL, lap_msg); 3280 path->mtu_selector = IB_SA_EQ; 3281 path->mtu = cm_id_priv->path_mtu; 3282 path->rate_selector = IB_SA_EQ; 3283 path->rate = IBA_GET(CM_LAP_ALTERNATE_PACKET_RATE, lap_msg); 3284 path->packet_life_time_selector = IB_SA_EQ; 3285 path->packet_life_time = 3286 IBA_GET(CM_LAP_ALTERNATE_LOCAL_ACK_TIMEOUT, lap_msg); 3287 path->packet_life_time -= (path->packet_life_time > 0); 3288 cm_format_path_lid_from_lap(lap_msg, path); 3289 } 3290 3291 static int cm_lap_handler(struct cm_work *work) 3292 { 3293 struct cm_id_private *cm_id_priv; 3294 struct cm_lap_msg *lap_msg; 3295 struct ib_cm_lap_event_param *param; 3296 struct ib_mad_send_buf *msg = NULL; 3297 int ret; 3298 3299 /* Currently Alternate path messages are not supported for 3300 * RoCE link layer. 3301 */ 3302 if (rdma_protocol_roce(work->port->cm_dev->ib_device, 3303 work->port->port_num)) 3304 return -EINVAL; 3305 3306 /* todo: verify LAP request and send reject APR if invalid. */ 3307 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 3308 cm_id_priv = cm_acquire_id( 3309 cpu_to_be32(IBA_GET(CM_LAP_REMOTE_COMM_ID, lap_msg)), 3310 cpu_to_be32(IBA_GET(CM_LAP_LOCAL_COMM_ID, lap_msg))); 3311 if (!cm_id_priv) 3312 return -EINVAL; 3313 3314 param = &work->cm_event.param.lap_rcvd; 3315 memset(&work->path[0], 0, sizeof(work->path[1])); 3316 cm_path_set_rec_type(work->port->cm_dev->ib_device, 3317 work->port->port_num, &work->path[0], 3318 IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, 3319 lap_msg)); 3320 param->alternate_path = &work->path[0]; 3321 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 3322 work->cm_event.private_data = 3323 IBA_GET_MEM_PTR(CM_LAP_PRIVATE_DATA, lap_msg); 3324 3325 spin_lock_irq(&cm_id_priv->lock); 3326 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 3327 goto unlock; 3328 3329 switch (cm_id_priv->id.lap_state) { 3330 case IB_CM_LAP_UNINIT: 3331 case IB_CM_LAP_IDLE: 3332 break; 3333 case IB_CM_MRA_LAP_SENT: 3334 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3335 counter[CM_LAP_COUNTER]); 3336 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc); 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->service_timeout, 3343 cm_id_priv->private_data, 3344 cm_id_priv->private_data_len); 3345 spin_unlock_irq(&cm_id_priv->lock); 3346 3347 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || 3348 ib_post_send_mad(msg, NULL)) 3349 cm_free_msg(msg); 3350 goto deref; 3351 case IB_CM_LAP_RCVD: 3352 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3353 counter[CM_LAP_COUNTER]); 3354 goto unlock; 3355 default: 3356 goto unlock; 3357 } 3358 3359 ret = cm_init_av_for_lap(work->port, work->mad_recv_wc->wc, 3360 work->mad_recv_wc->recv_buf.grh, 3361 &cm_id_priv->av); 3362 if (ret) 3363 goto unlock; 3364 3365 ret = cm_init_av_by_path(param->alternate_path, NULL, 3366 &cm_id_priv->alt_av, cm_id_priv); 3367 if (ret) 3368 goto unlock; 3369 3370 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 3371 cm_id_priv->tid = lap_msg->hdr.tid; 3372 cm_queue_work_unlock(cm_id_priv, work); 3373 return 0; 3374 3375 unlock: spin_unlock_irq(&cm_id_priv->lock); 3376 deref: cm_deref_id(cm_id_priv); 3377 return -EINVAL; 3378 } 3379 3380 static int cm_apr_handler(struct cm_work *work) 3381 { 3382 struct cm_id_private *cm_id_priv; 3383 struct cm_apr_msg *apr_msg; 3384 3385 /* Currently Alternate path messages are not supported for 3386 * RoCE link layer. 3387 */ 3388 if (rdma_protocol_roce(work->port->cm_dev->ib_device, 3389 work->port->port_num)) 3390 return -EINVAL; 3391 3392 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 3393 cm_id_priv = cm_acquire_id( 3394 cpu_to_be32(IBA_GET(CM_APR_REMOTE_COMM_ID, apr_msg)), 3395 cpu_to_be32(IBA_GET(CM_APR_LOCAL_COMM_ID, apr_msg))); 3396 if (!cm_id_priv) 3397 return -EINVAL; /* Unmatched reply. */ 3398 3399 work->cm_event.param.apr_rcvd.ap_status = 3400 IBA_GET(CM_APR_AR_STATUS, apr_msg); 3401 work->cm_event.param.apr_rcvd.apr_info = 3402 IBA_GET_MEM_PTR(CM_APR_ADDITIONAL_INFORMATION, apr_msg); 3403 work->cm_event.param.apr_rcvd.info_len = 3404 IBA_GET(CM_APR_ADDITIONAL_INFORMATION_LENGTH, apr_msg); 3405 work->cm_event.private_data = 3406 IBA_GET_MEM_PTR(CM_APR_PRIVATE_DATA, apr_msg); 3407 3408 spin_lock_irq(&cm_id_priv->lock); 3409 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 3410 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 3411 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 3412 spin_unlock_irq(&cm_id_priv->lock); 3413 goto out; 3414 } 3415 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 3416 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3417 cm_id_priv->msg = NULL; 3418 cm_queue_work_unlock(cm_id_priv, work); 3419 return 0; 3420 out: 3421 cm_deref_id(cm_id_priv); 3422 return -EINVAL; 3423 } 3424 3425 static int cm_timewait_handler(struct cm_work *work) 3426 { 3427 struct cm_timewait_info *timewait_info; 3428 struct cm_id_private *cm_id_priv; 3429 3430 timewait_info = container_of(work, struct cm_timewait_info, work); 3431 spin_lock_irq(&cm.lock); 3432 list_del(&timewait_info->list); 3433 spin_unlock_irq(&cm.lock); 3434 3435 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 3436 timewait_info->work.remote_id); 3437 if (!cm_id_priv) 3438 return -EINVAL; 3439 3440 spin_lock_irq(&cm_id_priv->lock); 3441 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 3442 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 3443 spin_unlock_irq(&cm_id_priv->lock); 3444 goto out; 3445 } 3446 cm_id_priv->id.state = IB_CM_IDLE; 3447 cm_queue_work_unlock(cm_id_priv, work); 3448 return 0; 3449 out: 3450 cm_deref_id(cm_id_priv); 3451 return -EINVAL; 3452 } 3453 3454 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 3455 struct cm_id_private *cm_id_priv, 3456 struct ib_cm_sidr_req_param *param) 3457 { 3458 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 3459 cm_form_tid(cm_id_priv)); 3460 IBA_SET(CM_SIDR_REQ_REQUESTID, sidr_req_msg, 3461 be32_to_cpu(cm_id_priv->id.local_id)); 3462 IBA_SET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg, 3463 be16_to_cpu(param->path->pkey)); 3464 IBA_SET(CM_SIDR_REQ_SERVICEID, sidr_req_msg, 3465 be64_to_cpu(param->service_id)); 3466 3467 if (param->private_data && param->private_data_len) 3468 IBA_SET_MEM(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg, 3469 param->private_data, param->private_data_len); 3470 } 3471 3472 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 3473 struct ib_cm_sidr_req_param *param) 3474 { 3475 struct cm_id_private *cm_id_priv; 3476 struct ib_mad_send_buf *msg; 3477 unsigned long flags; 3478 int ret; 3479 3480 if (!param->path || (param->private_data && 3481 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 3482 return -EINVAL; 3483 3484 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3485 ret = cm_init_av_by_path(param->path, param->sgid_attr, 3486 &cm_id_priv->av, 3487 cm_id_priv); 3488 if (ret) 3489 goto out; 3490 3491 cm_id->service_id = param->service_id; 3492 cm_id->service_mask = ~cpu_to_be64(0); 3493 cm_id_priv->timeout_ms = param->timeout_ms; 3494 cm_id_priv->max_cm_retries = param->max_cm_retries; 3495 ret = cm_alloc_msg(cm_id_priv, &msg); 3496 if (ret) 3497 goto out; 3498 3499 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 3500 param); 3501 msg->timeout_ms = cm_id_priv->timeout_ms; 3502 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 3503 3504 spin_lock_irqsave(&cm_id_priv->lock, flags); 3505 if (cm_id->state == IB_CM_IDLE) { 3506 trace_icm_send_sidr_req(&cm_id_priv->id); 3507 ret = ib_post_send_mad(msg, NULL); 3508 } else { 3509 ret = -EINVAL; 3510 } 3511 3512 if (ret) { 3513 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3514 cm_free_msg(msg); 3515 goto out; 3516 } 3517 cm_id->state = IB_CM_SIDR_REQ_SENT; 3518 cm_id_priv->msg = msg; 3519 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3520 out: 3521 return ret; 3522 } 3523 EXPORT_SYMBOL(ib_send_cm_sidr_req); 3524 3525 static void cm_format_sidr_req_event(struct cm_work *work, 3526 const struct cm_id_private *rx_cm_id, 3527 struct ib_cm_id *listen_id) 3528 { 3529 struct cm_sidr_req_msg *sidr_req_msg; 3530 struct ib_cm_sidr_req_event_param *param; 3531 3532 sidr_req_msg = (struct cm_sidr_req_msg *) 3533 work->mad_recv_wc->recv_buf.mad; 3534 param = &work->cm_event.param.sidr_req_rcvd; 3535 param->pkey = IBA_GET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg); 3536 param->listen_id = listen_id; 3537 param->service_id = 3538 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg)); 3539 param->bth_pkey = cm_get_bth_pkey(work); 3540 param->port = work->port->port_num; 3541 param->sgid_attr = rx_cm_id->av.ah_attr.grh.sgid_attr; 3542 work->cm_event.private_data = 3543 IBA_GET_MEM_PTR(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg); 3544 } 3545 3546 static int cm_sidr_req_handler(struct cm_work *work) 3547 { 3548 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 3549 struct cm_sidr_req_msg *sidr_req_msg; 3550 struct ib_wc *wc; 3551 int ret; 3552 3553 cm_id_priv = 3554 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL); 3555 if (IS_ERR(cm_id_priv)) 3556 return PTR_ERR(cm_id_priv); 3557 3558 /* Record SGID/SLID and request ID for lookup. */ 3559 sidr_req_msg = (struct cm_sidr_req_msg *) 3560 work->mad_recv_wc->recv_buf.mad; 3561 3562 cm_id_priv->id.remote_id = 3563 cpu_to_be32(IBA_GET(CM_SIDR_REQ_REQUESTID, sidr_req_msg)); 3564 cm_id_priv->id.service_id = 3565 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg)); 3566 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 3567 cm_id_priv->tid = sidr_req_msg->hdr.tid; 3568 3569 wc = work->mad_recv_wc->wc; 3570 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 3571 cm_id_priv->av.dgid.global.interface_id = 0; 3572 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 3573 work->mad_recv_wc->recv_buf.grh, 3574 &cm_id_priv->av); 3575 if (ret) 3576 goto out; 3577 3578 spin_lock_irq(&cm.lock); 3579 listen_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 3580 if (listen_cm_id_priv) { 3581 spin_unlock_irq(&cm.lock); 3582 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3583 counter[CM_SIDR_REQ_COUNTER]); 3584 goto out; /* Duplicate message. */ 3585 } 3586 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3587 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 3588 cm_id_priv->id.service_id); 3589 if (!listen_cm_id_priv) { 3590 spin_unlock_irq(&cm.lock); 3591 ib_send_cm_sidr_rep(&cm_id_priv->id, 3592 &(struct ib_cm_sidr_rep_param){ 3593 .status = IB_SIDR_UNSUPPORTED }); 3594 goto out; /* No match. */ 3595 } 3596 spin_unlock_irq(&cm.lock); 3597 3598 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 3599 cm_id_priv->id.context = listen_cm_id_priv->id.context; 3600 3601 /* 3602 * A SIDR ID does not need to be in the xarray since it does not receive 3603 * mads, is not placed in the remote_id or remote_qpn rbtree, and does 3604 * not enter timewait. 3605 */ 3606 3607 cm_format_sidr_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 3608 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 3609 cm_free_work(work); 3610 /* 3611 * A pointer to the listen_cm_id is held in the event, so this deref 3612 * must be after the event is delivered above. 3613 */ 3614 cm_deref_id(listen_cm_id_priv); 3615 if (ret) 3616 cm_destroy_id(&cm_id_priv->id, ret); 3617 return 0; 3618 out: 3619 ib_destroy_cm_id(&cm_id_priv->id); 3620 return -EINVAL; 3621 } 3622 3623 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3624 struct cm_id_private *cm_id_priv, 3625 struct ib_cm_sidr_rep_param *param) 3626 { 3627 cm_format_mad_ece_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3628 cm_id_priv->tid, param->ece.attr_mod); 3629 IBA_SET(CM_SIDR_REP_REQUESTID, sidr_rep_msg, 3630 be32_to_cpu(cm_id_priv->id.remote_id)); 3631 IBA_SET(CM_SIDR_REP_STATUS, sidr_rep_msg, param->status); 3632 IBA_SET(CM_SIDR_REP_QPN, sidr_rep_msg, param->qp_num); 3633 IBA_SET(CM_SIDR_REP_SERVICEID, sidr_rep_msg, 3634 be64_to_cpu(cm_id_priv->id.service_id)); 3635 IBA_SET(CM_SIDR_REP_Q_KEY, sidr_rep_msg, param->qkey); 3636 IBA_SET(CM_SIDR_REP_VENDOR_ID_L, sidr_rep_msg, 3637 param->ece.vendor_id & 0xFF); 3638 IBA_SET(CM_SIDR_REP_VENDOR_ID_H, sidr_rep_msg, 3639 (param->ece.vendor_id >> 8) & 0xFF); 3640 3641 if (param->info && param->info_length) 3642 IBA_SET_MEM(CM_SIDR_REP_ADDITIONAL_INFORMATION, sidr_rep_msg, 3643 param->info, param->info_length); 3644 3645 if (param->private_data && param->private_data_len) 3646 IBA_SET_MEM(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg, 3647 param->private_data, param->private_data_len); 3648 } 3649 3650 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv, 3651 struct ib_cm_sidr_rep_param *param) 3652 { 3653 struct ib_mad_send_buf *msg; 3654 int ret; 3655 3656 lockdep_assert_held(&cm_id_priv->lock); 3657 3658 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3659 (param->private_data && 3660 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3661 return -EINVAL; 3662 3663 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_RCVD) 3664 return -EINVAL; 3665 3666 ret = cm_alloc_msg(cm_id_priv, &msg); 3667 if (ret) 3668 return ret; 3669 3670 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3671 param); 3672 trace_icm_send_sidr_rep(&cm_id_priv->id); 3673 ret = ib_post_send_mad(msg, NULL); 3674 if (ret) { 3675 cm_free_msg(msg); 3676 return ret; 3677 } 3678 cm_id_priv->id.state = IB_CM_IDLE; 3679 spin_lock_irq(&cm.lock); 3680 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) { 3681 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3682 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); 3683 } 3684 spin_unlock_irq(&cm.lock); 3685 return 0; 3686 } 3687 3688 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3689 struct ib_cm_sidr_rep_param *param) 3690 { 3691 struct cm_id_private *cm_id_priv = 3692 container_of(cm_id, struct cm_id_private, id); 3693 unsigned long flags; 3694 int ret; 3695 3696 spin_lock_irqsave(&cm_id_priv->lock, flags); 3697 ret = cm_send_sidr_rep_locked(cm_id_priv, param); 3698 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3699 return ret; 3700 } 3701 EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3702 3703 static void cm_format_sidr_rep_event(struct cm_work *work, 3704 const struct cm_id_private *cm_id_priv) 3705 { 3706 struct cm_sidr_rep_msg *sidr_rep_msg; 3707 struct ib_cm_sidr_rep_event_param *param; 3708 3709 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3710 work->mad_recv_wc->recv_buf.mad; 3711 param = &work->cm_event.param.sidr_rep_rcvd; 3712 param->status = IBA_GET(CM_SIDR_REP_STATUS, sidr_rep_msg); 3713 param->qkey = IBA_GET(CM_SIDR_REP_Q_KEY, sidr_rep_msg); 3714 param->qpn = IBA_GET(CM_SIDR_REP_QPN, sidr_rep_msg); 3715 param->info = IBA_GET_MEM_PTR(CM_SIDR_REP_ADDITIONAL_INFORMATION, 3716 sidr_rep_msg); 3717 param->info_len = IBA_GET(CM_SIDR_REP_ADDITIONAL_INFORMATION_LENGTH, 3718 sidr_rep_msg); 3719 param->sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr; 3720 work->cm_event.private_data = 3721 IBA_GET_MEM_PTR(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg); 3722 } 3723 3724 static int cm_sidr_rep_handler(struct cm_work *work) 3725 { 3726 struct cm_sidr_rep_msg *sidr_rep_msg; 3727 struct cm_id_private *cm_id_priv; 3728 3729 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3730 work->mad_recv_wc->recv_buf.mad; 3731 cm_id_priv = cm_acquire_id( 3732 cpu_to_be32(IBA_GET(CM_SIDR_REP_REQUESTID, sidr_rep_msg)), 0); 3733 if (!cm_id_priv) 3734 return -EINVAL; /* Unmatched reply. */ 3735 3736 spin_lock_irq(&cm_id_priv->lock); 3737 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3738 spin_unlock_irq(&cm_id_priv->lock); 3739 goto out; 3740 } 3741 cm_id_priv->id.state = IB_CM_IDLE; 3742 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3743 spin_unlock_irq(&cm_id_priv->lock); 3744 3745 cm_format_sidr_rep_event(work, cm_id_priv); 3746 cm_process_work(cm_id_priv, work); 3747 return 0; 3748 out: 3749 cm_deref_id(cm_id_priv); 3750 return -EINVAL; 3751 } 3752 3753 static void cm_process_send_error(struct ib_mad_send_buf *msg, 3754 enum ib_wc_status wc_status) 3755 { 3756 struct cm_id_private *cm_id_priv; 3757 struct ib_cm_event cm_event; 3758 enum ib_cm_state state; 3759 int ret; 3760 3761 memset(&cm_event, 0, sizeof cm_event); 3762 cm_id_priv = msg->context[0]; 3763 3764 /* Discard old sends or ones without a response. */ 3765 spin_lock_irq(&cm_id_priv->lock); 3766 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3767 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3768 goto discard; 3769 3770 trace_icm_mad_send_err(state, wc_status); 3771 switch (state) { 3772 case IB_CM_REQ_SENT: 3773 case IB_CM_MRA_REQ_RCVD: 3774 cm_reset_to_idle(cm_id_priv); 3775 cm_event.event = IB_CM_REQ_ERROR; 3776 break; 3777 case IB_CM_REP_SENT: 3778 case IB_CM_MRA_REP_RCVD: 3779 cm_reset_to_idle(cm_id_priv); 3780 cm_event.event = IB_CM_REP_ERROR; 3781 break; 3782 case IB_CM_DREQ_SENT: 3783 cm_enter_timewait(cm_id_priv); 3784 cm_event.event = IB_CM_DREQ_ERROR; 3785 break; 3786 case IB_CM_SIDR_REQ_SENT: 3787 cm_id_priv->id.state = IB_CM_IDLE; 3788 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3789 break; 3790 default: 3791 goto discard; 3792 } 3793 spin_unlock_irq(&cm_id_priv->lock); 3794 cm_event.param.send_status = wc_status; 3795 3796 /* No other events can occur on the cm_id at this point. */ 3797 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3798 cm_free_msg(msg); 3799 if (ret) 3800 ib_destroy_cm_id(&cm_id_priv->id); 3801 return; 3802 discard: 3803 spin_unlock_irq(&cm_id_priv->lock); 3804 cm_free_msg(msg); 3805 } 3806 3807 static void cm_send_handler(struct ib_mad_agent *mad_agent, 3808 struct ib_mad_send_wc *mad_send_wc) 3809 { 3810 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3811 struct cm_port *port; 3812 u16 attr_index; 3813 3814 port = mad_agent->context; 3815 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3816 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3817 3818 /* 3819 * If the send was in response to a received message (context[0] is not 3820 * set to a cm_id), and is not a REJ, then it is a send that was 3821 * manually retried. 3822 */ 3823 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3824 msg->retries = 1; 3825 3826 atomic_long_add(1 + msg->retries, 3827 &port->counter_group[CM_XMIT].counter[attr_index]); 3828 if (msg->retries) 3829 atomic_long_add(msg->retries, 3830 &port->counter_group[CM_XMIT_RETRIES]. 3831 counter[attr_index]); 3832 3833 switch (mad_send_wc->status) { 3834 case IB_WC_SUCCESS: 3835 case IB_WC_WR_FLUSH_ERR: 3836 cm_free_msg(msg); 3837 break; 3838 default: 3839 if (msg->context[0] && msg->context[1]) 3840 cm_process_send_error(msg, mad_send_wc->status); 3841 else 3842 cm_free_msg(msg); 3843 break; 3844 } 3845 } 3846 3847 static void cm_work_handler(struct work_struct *_work) 3848 { 3849 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3850 int ret; 3851 3852 switch (work->cm_event.event) { 3853 case IB_CM_REQ_RECEIVED: 3854 ret = cm_req_handler(work); 3855 break; 3856 case IB_CM_MRA_RECEIVED: 3857 ret = cm_mra_handler(work); 3858 break; 3859 case IB_CM_REJ_RECEIVED: 3860 ret = cm_rej_handler(work); 3861 break; 3862 case IB_CM_REP_RECEIVED: 3863 ret = cm_rep_handler(work); 3864 break; 3865 case IB_CM_RTU_RECEIVED: 3866 ret = cm_rtu_handler(work); 3867 break; 3868 case IB_CM_USER_ESTABLISHED: 3869 ret = cm_establish_handler(work); 3870 break; 3871 case IB_CM_DREQ_RECEIVED: 3872 ret = cm_dreq_handler(work); 3873 break; 3874 case IB_CM_DREP_RECEIVED: 3875 ret = cm_drep_handler(work); 3876 break; 3877 case IB_CM_SIDR_REQ_RECEIVED: 3878 ret = cm_sidr_req_handler(work); 3879 break; 3880 case IB_CM_SIDR_REP_RECEIVED: 3881 ret = cm_sidr_rep_handler(work); 3882 break; 3883 case IB_CM_LAP_RECEIVED: 3884 ret = cm_lap_handler(work); 3885 break; 3886 case IB_CM_APR_RECEIVED: 3887 ret = cm_apr_handler(work); 3888 break; 3889 case IB_CM_TIMEWAIT_EXIT: 3890 ret = cm_timewait_handler(work); 3891 break; 3892 default: 3893 trace_icm_handler_err(work->cm_event.event); 3894 ret = -EINVAL; 3895 break; 3896 } 3897 if (ret) 3898 cm_free_work(work); 3899 } 3900 3901 static int cm_establish(struct ib_cm_id *cm_id) 3902 { 3903 struct cm_id_private *cm_id_priv; 3904 struct cm_work *work; 3905 unsigned long flags; 3906 int ret = 0; 3907 struct cm_device *cm_dev; 3908 3909 cm_dev = ib_get_client_data(cm_id->device, &cm_client); 3910 if (!cm_dev) 3911 return -ENODEV; 3912 3913 work = kmalloc(sizeof *work, GFP_ATOMIC); 3914 if (!work) 3915 return -ENOMEM; 3916 3917 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3918 spin_lock_irqsave(&cm_id_priv->lock, flags); 3919 switch (cm_id->state) 3920 { 3921 case IB_CM_REP_SENT: 3922 case IB_CM_MRA_REP_RCVD: 3923 cm_id->state = IB_CM_ESTABLISHED; 3924 break; 3925 case IB_CM_ESTABLISHED: 3926 ret = -EISCONN; 3927 break; 3928 default: 3929 trace_icm_establish_err(cm_id); 3930 ret = -EINVAL; 3931 break; 3932 } 3933 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3934 3935 if (ret) { 3936 kfree(work); 3937 goto out; 3938 } 3939 3940 /* 3941 * The CM worker thread may try to destroy the cm_id before it 3942 * can execute this work item. To prevent potential deadlock, 3943 * we need to find the cm_id once we're in the context of the 3944 * worker thread, rather than holding a reference on it. 3945 */ 3946 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3947 work->local_id = cm_id->local_id; 3948 work->remote_id = cm_id->remote_id; 3949 work->mad_recv_wc = NULL; 3950 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3951 3952 /* Check if the device started its remove_one */ 3953 spin_lock_irqsave(&cm.lock, flags); 3954 if (!cm_dev->going_down) { 3955 queue_delayed_work(cm.wq, &work->work, 0); 3956 } else { 3957 kfree(work); 3958 ret = -ENODEV; 3959 } 3960 spin_unlock_irqrestore(&cm.lock, flags); 3961 3962 out: 3963 return ret; 3964 } 3965 3966 static int cm_migrate(struct ib_cm_id *cm_id) 3967 { 3968 struct cm_id_private *cm_id_priv; 3969 struct cm_av tmp_av; 3970 unsigned long flags; 3971 int tmp_send_port_not_ready; 3972 int ret = 0; 3973 3974 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3975 spin_lock_irqsave(&cm_id_priv->lock, flags); 3976 if (cm_id->state == IB_CM_ESTABLISHED && 3977 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3978 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3979 cm_id->lap_state = IB_CM_LAP_IDLE; 3980 /* Swap address vector */ 3981 tmp_av = cm_id_priv->av; 3982 cm_id_priv->av = cm_id_priv->alt_av; 3983 cm_id_priv->alt_av = tmp_av; 3984 /* Swap port send ready state */ 3985 tmp_send_port_not_ready = cm_id_priv->prim_send_port_not_ready; 3986 cm_id_priv->prim_send_port_not_ready = cm_id_priv->altr_send_port_not_ready; 3987 cm_id_priv->altr_send_port_not_ready = tmp_send_port_not_ready; 3988 } else 3989 ret = -EINVAL; 3990 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3991 3992 return ret; 3993 } 3994 3995 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3996 { 3997 int ret; 3998 3999 switch (event) { 4000 case IB_EVENT_COMM_EST: 4001 ret = cm_establish(cm_id); 4002 break; 4003 case IB_EVENT_PATH_MIG: 4004 ret = cm_migrate(cm_id); 4005 break; 4006 default: 4007 ret = -EINVAL; 4008 } 4009 return ret; 4010 } 4011 EXPORT_SYMBOL(ib_cm_notify); 4012 4013 static void cm_recv_handler(struct ib_mad_agent *mad_agent, 4014 struct ib_mad_send_buf *send_buf, 4015 struct ib_mad_recv_wc *mad_recv_wc) 4016 { 4017 struct cm_port *port = mad_agent->context; 4018 struct cm_work *work; 4019 enum ib_cm_event_type event; 4020 bool alt_path = false; 4021 u16 attr_id; 4022 int paths = 0; 4023 int going_down = 0; 4024 4025 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 4026 case CM_REQ_ATTR_ID: 4027 alt_path = cm_req_has_alt_path((struct cm_req_msg *) 4028 mad_recv_wc->recv_buf.mad); 4029 paths = 1 + (alt_path != 0); 4030 event = IB_CM_REQ_RECEIVED; 4031 break; 4032 case CM_MRA_ATTR_ID: 4033 event = IB_CM_MRA_RECEIVED; 4034 break; 4035 case CM_REJ_ATTR_ID: 4036 event = IB_CM_REJ_RECEIVED; 4037 break; 4038 case CM_REP_ATTR_ID: 4039 event = IB_CM_REP_RECEIVED; 4040 break; 4041 case CM_RTU_ATTR_ID: 4042 event = IB_CM_RTU_RECEIVED; 4043 break; 4044 case CM_DREQ_ATTR_ID: 4045 event = IB_CM_DREQ_RECEIVED; 4046 break; 4047 case CM_DREP_ATTR_ID: 4048 event = IB_CM_DREP_RECEIVED; 4049 break; 4050 case CM_SIDR_REQ_ATTR_ID: 4051 event = IB_CM_SIDR_REQ_RECEIVED; 4052 break; 4053 case CM_SIDR_REP_ATTR_ID: 4054 event = IB_CM_SIDR_REP_RECEIVED; 4055 break; 4056 case CM_LAP_ATTR_ID: 4057 paths = 1; 4058 event = IB_CM_LAP_RECEIVED; 4059 break; 4060 case CM_APR_ATTR_ID: 4061 event = IB_CM_APR_RECEIVED; 4062 break; 4063 default: 4064 ib_free_recv_mad(mad_recv_wc); 4065 return; 4066 } 4067 4068 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 4069 atomic_long_inc(&port->counter_group[CM_RECV]. 4070 counter[attr_id - CM_ATTR_ID_OFFSET]); 4071 4072 work = kmalloc(struct_size(work, path, paths), GFP_KERNEL); 4073 if (!work) { 4074 ib_free_recv_mad(mad_recv_wc); 4075 return; 4076 } 4077 4078 INIT_DELAYED_WORK(&work->work, cm_work_handler); 4079 work->cm_event.event = event; 4080 work->mad_recv_wc = mad_recv_wc; 4081 work->port = port; 4082 4083 /* Check if the device started its remove_one */ 4084 spin_lock_irq(&cm.lock); 4085 if (!port->cm_dev->going_down) 4086 queue_delayed_work(cm.wq, &work->work, 0); 4087 else 4088 going_down = 1; 4089 spin_unlock_irq(&cm.lock); 4090 4091 if (going_down) { 4092 kfree(work); 4093 ib_free_recv_mad(mad_recv_wc); 4094 } 4095 } 4096 4097 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 4098 struct ib_qp_attr *qp_attr, 4099 int *qp_attr_mask) 4100 { 4101 unsigned long flags; 4102 int ret; 4103 4104 spin_lock_irqsave(&cm_id_priv->lock, flags); 4105 switch (cm_id_priv->id.state) { 4106 case IB_CM_REQ_SENT: 4107 case IB_CM_MRA_REQ_RCVD: 4108 case IB_CM_REQ_RCVD: 4109 case IB_CM_MRA_REQ_SENT: 4110 case IB_CM_REP_RCVD: 4111 case IB_CM_MRA_REP_SENT: 4112 case IB_CM_REP_SENT: 4113 case IB_CM_MRA_REP_RCVD: 4114 case IB_CM_ESTABLISHED: 4115 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 4116 IB_QP_PKEY_INDEX | IB_QP_PORT; 4117 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 4118 if (cm_id_priv->responder_resources) 4119 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 4120 IB_ACCESS_REMOTE_ATOMIC; 4121 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 4122 qp_attr->port_num = cm_id_priv->av.port->port_num; 4123 ret = 0; 4124 break; 4125 default: 4126 trace_icm_qp_init_err(&cm_id_priv->id); 4127 ret = -EINVAL; 4128 break; 4129 } 4130 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4131 return ret; 4132 } 4133 4134 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 4135 struct ib_qp_attr *qp_attr, 4136 int *qp_attr_mask) 4137 { 4138 unsigned long flags; 4139 int ret; 4140 4141 spin_lock_irqsave(&cm_id_priv->lock, flags); 4142 switch (cm_id_priv->id.state) { 4143 case IB_CM_REQ_RCVD: 4144 case IB_CM_MRA_REQ_SENT: 4145 case IB_CM_REP_RCVD: 4146 case IB_CM_MRA_REP_SENT: 4147 case IB_CM_REP_SENT: 4148 case IB_CM_MRA_REP_RCVD: 4149 case IB_CM_ESTABLISHED: 4150 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 4151 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 4152 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 4153 qp_attr->path_mtu = cm_id_priv->path_mtu; 4154 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 4155 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 4156 if (cm_id_priv->qp_type == IB_QPT_RC || 4157 cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 4158 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 4159 IB_QP_MIN_RNR_TIMER; 4160 qp_attr->max_dest_rd_atomic = 4161 cm_id_priv->responder_resources; 4162 qp_attr->min_rnr_timer = 0; 4163 } 4164 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) { 4165 *qp_attr_mask |= IB_QP_ALT_PATH; 4166 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 4167 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 4168 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 4169 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 4170 } 4171 ret = 0; 4172 break; 4173 default: 4174 trace_icm_qp_rtr_err(&cm_id_priv->id); 4175 ret = -EINVAL; 4176 break; 4177 } 4178 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4179 return ret; 4180 } 4181 4182 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 4183 struct ib_qp_attr *qp_attr, 4184 int *qp_attr_mask) 4185 { 4186 unsigned long flags; 4187 int ret; 4188 4189 spin_lock_irqsave(&cm_id_priv->lock, flags); 4190 switch (cm_id_priv->id.state) { 4191 /* Allow transition to RTS before sending REP */ 4192 case IB_CM_REQ_RCVD: 4193 case IB_CM_MRA_REQ_SENT: 4194 4195 case IB_CM_REP_RCVD: 4196 case IB_CM_MRA_REP_SENT: 4197 case IB_CM_REP_SENT: 4198 case IB_CM_MRA_REP_RCVD: 4199 case IB_CM_ESTABLISHED: 4200 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 4201 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 4202 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 4203 switch (cm_id_priv->qp_type) { 4204 case IB_QPT_RC: 4205 case IB_QPT_XRC_INI: 4206 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY | 4207 IB_QP_MAX_QP_RD_ATOMIC; 4208 qp_attr->retry_cnt = cm_id_priv->retry_count; 4209 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 4210 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 4211 fallthrough; 4212 case IB_QPT_XRC_TGT: 4213 *qp_attr_mask |= IB_QP_TIMEOUT; 4214 qp_attr->timeout = cm_id_priv->av.timeout; 4215 break; 4216 default: 4217 break; 4218 } 4219 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) { 4220 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 4221 qp_attr->path_mig_state = IB_MIG_REARM; 4222 } 4223 } else { 4224 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 4225 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 4226 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 4227 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 4228 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 4229 qp_attr->path_mig_state = IB_MIG_REARM; 4230 } 4231 ret = 0; 4232 break; 4233 default: 4234 trace_icm_qp_rts_err(&cm_id_priv->id); 4235 ret = -EINVAL; 4236 break; 4237 } 4238 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4239 return ret; 4240 } 4241 4242 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 4243 struct ib_qp_attr *qp_attr, 4244 int *qp_attr_mask) 4245 { 4246 struct cm_id_private *cm_id_priv; 4247 int ret; 4248 4249 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 4250 switch (qp_attr->qp_state) { 4251 case IB_QPS_INIT: 4252 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 4253 break; 4254 case IB_QPS_RTR: 4255 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 4256 break; 4257 case IB_QPS_RTS: 4258 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 4259 break; 4260 default: 4261 ret = -EINVAL; 4262 break; 4263 } 4264 return ret; 4265 } 4266 EXPORT_SYMBOL(ib_cm_init_qp_attr); 4267 4268 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 4269 char *buf) 4270 { 4271 struct cm_counter_group *group; 4272 struct cm_counter_attribute *cm_attr; 4273 4274 group = container_of(obj, struct cm_counter_group, obj); 4275 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 4276 4277 return sysfs_emit(buf, "%ld\n", 4278 atomic_long_read(&group->counter[cm_attr->index])); 4279 } 4280 4281 static const struct sysfs_ops cm_counter_ops = { 4282 .show = cm_show_counter 4283 }; 4284 4285 static struct kobj_type cm_counter_obj_type = { 4286 .sysfs_ops = &cm_counter_ops, 4287 .default_attrs = cm_counter_default_attrs 4288 }; 4289 4290 static int cm_create_port_fs(struct cm_port *port) 4291 { 4292 int i, ret; 4293 4294 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 4295 ret = ib_port_register_module_stat(port->cm_dev->ib_device, 4296 port->port_num, 4297 &port->counter_group[i].obj, 4298 &cm_counter_obj_type, 4299 counter_group_names[i]); 4300 if (ret) 4301 goto error; 4302 } 4303 4304 return 0; 4305 4306 error: 4307 while (i--) 4308 ib_port_unregister_module_stat(&port->counter_group[i].obj); 4309 return ret; 4310 4311 } 4312 4313 static void cm_remove_port_fs(struct cm_port *port) 4314 { 4315 int i; 4316 4317 for (i = 0; i < CM_COUNTER_GROUPS; i++) 4318 ib_port_unregister_module_stat(&port->counter_group[i].obj); 4319 4320 } 4321 4322 static int cm_add_one(struct ib_device *ib_device) 4323 { 4324 struct cm_device *cm_dev; 4325 struct cm_port *port; 4326 struct ib_mad_reg_req reg_req = { 4327 .mgmt_class = IB_MGMT_CLASS_CM, 4328 .mgmt_class_version = IB_CM_CLASS_VERSION, 4329 }; 4330 struct ib_port_modify port_modify = { 4331 .set_port_cap_mask = IB_PORT_CM_SUP 4332 }; 4333 unsigned long flags; 4334 int ret; 4335 int count = 0; 4336 u8 i; 4337 4338 cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt), 4339 GFP_KERNEL); 4340 if (!cm_dev) 4341 return -ENOMEM; 4342 4343 cm_dev->ib_device = ib_device; 4344 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay; 4345 cm_dev->going_down = 0; 4346 4347 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 4348 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 4349 if (!rdma_cap_ib_cm(ib_device, i)) 4350 continue; 4351 4352 port = kzalloc(sizeof *port, GFP_KERNEL); 4353 if (!port) { 4354 ret = -ENOMEM; 4355 goto error1; 4356 } 4357 4358 cm_dev->port[i-1] = port; 4359 port->cm_dev = cm_dev; 4360 port->port_num = i; 4361 4362 INIT_LIST_HEAD(&port->cm_priv_prim_list); 4363 INIT_LIST_HEAD(&port->cm_priv_altr_list); 4364 4365 ret = cm_create_port_fs(port); 4366 if (ret) 4367 goto error1; 4368 4369 port->mad_agent = ib_register_mad_agent(ib_device, i, 4370 IB_QPT_GSI, 4371 ®_req, 4372 0, 4373 cm_send_handler, 4374 cm_recv_handler, 4375 port, 4376 0); 4377 if (IS_ERR(port->mad_agent)) { 4378 ret = PTR_ERR(port->mad_agent); 4379 goto error2; 4380 } 4381 4382 ret = ib_modify_port(ib_device, i, 0, &port_modify); 4383 if (ret) 4384 goto error3; 4385 4386 count++; 4387 } 4388 4389 if (!count) { 4390 ret = -EOPNOTSUPP; 4391 goto free; 4392 } 4393 4394 ib_set_client_data(ib_device, &cm_client, cm_dev); 4395 4396 write_lock_irqsave(&cm.device_lock, flags); 4397 list_add_tail(&cm_dev->list, &cm.device_list); 4398 write_unlock_irqrestore(&cm.device_lock, flags); 4399 return 0; 4400 4401 error3: 4402 ib_unregister_mad_agent(port->mad_agent); 4403 error2: 4404 cm_remove_port_fs(port); 4405 error1: 4406 port_modify.set_port_cap_mask = 0; 4407 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 4408 kfree(port); 4409 while (--i) { 4410 if (!rdma_cap_ib_cm(ib_device, i)) 4411 continue; 4412 4413 port = cm_dev->port[i-1]; 4414 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4415 ib_unregister_mad_agent(port->mad_agent); 4416 cm_remove_port_fs(port); 4417 kfree(port); 4418 } 4419 free: 4420 kfree(cm_dev); 4421 return ret; 4422 } 4423 4424 static void cm_remove_one(struct ib_device *ib_device, void *client_data) 4425 { 4426 struct cm_device *cm_dev = client_data; 4427 struct cm_port *port; 4428 struct cm_id_private *cm_id_priv; 4429 struct ib_mad_agent *cur_mad_agent; 4430 struct ib_port_modify port_modify = { 4431 .clr_port_cap_mask = IB_PORT_CM_SUP 4432 }; 4433 unsigned long flags; 4434 int i; 4435 4436 write_lock_irqsave(&cm.device_lock, flags); 4437 list_del(&cm_dev->list); 4438 write_unlock_irqrestore(&cm.device_lock, flags); 4439 4440 spin_lock_irq(&cm.lock); 4441 cm_dev->going_down = 1; 4442 spin_unlock_irq(&cm.lock); 4443 4444 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 4445 if (!rdma_cap_ib_cm(ib_device, i)) 4446 continue; 4447 4448 port = cm_dev->port[i-1]; 4449 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4450 /* Mark all the cm_id's as not valid */ 4451 spin_lock_irq(&cm.lock); 4452 list_for_each_entry(cm_id_priv, &port->cm_priv_altr_list, altr_list) 4453 cm_id_priv->altr_send_port_not_ready = 1; 4454 list_for_each_entry(cm_id_priv, &port->cm_priv_prim_list, prim_list) 4455 cm_id_priv->prim_send_port_not_ready = 1; 4456 spin_unlock_irq(&cm.lock); 4457 /* 4458 * We flush the queue here after the going_down set, this 4459 * verify that no new works will be queued in the recv handler, 4460 * after that we can call the unregister_mad_agent 4461 */ 4462 flush_workqueue(cm.wq); 4463 spin_lock_irq(&cm.state_lock); 4464 cur_mad_agent = port->mad_agent; 4465 port->mad_agent = NULL; 4466 spin_unlock_irq(&cm.state_lock); 4467 ib_unregister_mad_agent(cur_mad_agent); 4468 cm_remove_port_fs(port); 4469 kfree(port); 4470 } 4471 4472 kfree(cm_dev); 4473 } 4474 4475 static int __init ib_cm_init(void) 4476 { 4477 int ret; 4478 4479 INIT_LIST_HEAD(&cm.device_list); 4480 rwlock_init(&cm.device_lock); 4481 spin_lock_init(&cm.lock); 4482 spin_lock_init(&cm.state_lock); 4483 cm.listen_service_table = RB_ROOT; 4484 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 4485 cm.remote_id_table = RB_ROOT; 4486 cm.remote_qp_table = RB_ROOT; 4487 cm.remote_sidr_table = RB_ROOT; 4488 xa_init_flags(&cm.local_id_table, XA_FLAGS_ALLOC); 4489 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 4490 INIT_LIST_HEAD(&cm.timewait_list); 4491 4492 cm.wq = alloc_workqueue("ib_cm", 0, 1); 4493 if (!cm.wq) { 4494 ret = -ENOMEM; 4495 goto error2; 4496 } 4497 4498 ret = ib_register_client(&cm_client); 4499 if (ret) 4500 goto error3; 4501 4502 return 0; 4503 error3: 4504 destroy_workqueue(cm.wq); 4505 error2: 4506 return ret; 4507 } 4508 4509 static void __exit ib_cm_cleanup(void) 4510 { 4511 struct cm_timewait_info *timewait_info, *tmp; 4512 4513 spin_lock_irq(&cm.lock); 4514 list_for_each_entry(timewait_info, &cm.timewait_list, list) 4515 cancel_delayed_work(&timewait_info->work.work); 4516 spin_unlock_irq(&cm.lock); 4517 4518 ib_unregister_client(&cm_client); 4519 destroy_workqueue(cm.wq); 4520 4521 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 4522 list_del(&timewait_info->list); 4523 kfree(timewait_info); 4524 } 4525 4526 WARN_ON(!xa_empty(&cm.local_id_table)); 4527 } 4528 4529 module_init(ib_cm_init); 4530 module_exit(ib_cm_cleanup); 4531