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