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 31 MODULE_AUTHOR("Sean Hefty"); 32 MODULE_DESCRIPTION("InfiniBand CM"); 33 MODULE_LICENSE("Dual BSD/GPL"); 34 35 static const char * const ibcm_rej_reason_strs[] = { 36 [IB_CM_REJ_NO_QP] = "no QP", 37 [IB_CM_REJ_NO_EEC] = "no EEC", 38 [IB_CM_REJ_NO_RESOURCES] = "no resources", 39 [IB_CM_REJ_TIMEOUT] = "timeout", 40 [IB_CM_REJ_UNSUPPORTED] = "unsupported", 41 [IB_CM_REJ_INVALID_COMM_ID] = "invalid comm ID", 42 [IB_CM_REJ_INVALID_COMM_INSTANCE] = "invalid comm instance", 43 [IB_CM_REJ_INVALID_SERVICE_ID] = "invalid service ID", 44 [IB_CM_REJ_INVALID_TRANSPORT_TYPE] = "invalid transport type", 45 [IB_CM_REJ_STALE_CONN] = "stale conn", 46 [IB_CM_REJ_RDC_NOT_EXIST] = "RDC not exist", 47 [IB_CM_REJ_INVALID_GID] = "invalid GID", 48 [IB_CM_REJ_INVALID_LID] = "invalid LID", 49 [IB_CM_REJ_INVALID_SL] = "invalid SL", 50 [IB_CM_REJ_INVALID_TRAFFIC_CLASS] = "invalid traffic class", 51 [IB_CM_REJ_INVALID_HOP_LIMIT] = "invalid hop limit", 52 [IB_CM_REJ_INVALID_PACKET_RATE] = "invalid packet rate", 53 [IB_CM_REJ_INVALID_ALT_GID] = "invalid alt GID", 54 [IB_CM_REJ_INVALID_ALT_LID] = "invalid alt LID", 55 [IB_CM_REJ_INVALID_ALT_SL] = "invalid alt SL", 56 [IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS] = "invalid alt traffic class", 57 [IB_CM_REJ_INVALID_ALT_HOP_LIMIT] = "invalid alt hop limit", 58 [IB_CM_REJ_INVALID_ALT_PACKET_RATE] = "invalid alt packet rate", 59 [IB_CM_REJ_PORT_CM_REDIRECT] = "port CM redirect", 60 [IB_CM_REJ_PORT_REDIRECT] = "port redirect", 61 [IB_CM_REJ_INVALID_MTU] = "invalid MTU", 62 [IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES] = "insufficient resp resources", 63 [IB_CM_REJ_CONSUMER_DEFINED] = "consumer defined", 64 [IB_CM_REJ_INVALID_RNR_RETRY] = "invalid RNR retry", 65 [IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID] = "duplicate local comm ID", 66 [IB_CM_REJ_INVALID_CLASS_VERSION] = "invalid class version", 67 [IB_CM_REJ_INVALID_FLOW_LABEL] = "invalid flow label", 68 [IB_CM_REJ_INVALID_ALT_FLOW_LABEL] = "invalid alt flow label", 69 [IB_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED] = 70 "vendor option is not supported", 71 }; 72 73 const char *__attribute_const__ ibcm_reject_msg(int reason) 74 { 75 size_t index = reason; 76 77 if (index < ARRAY_SIZE(ibcm_rej_reason_strs) && 78 ibcm_rej_reason_strs[index]) 79 return ibcm_rej_reason_strs[index]; 80 else 81 return "unrecognized reason"; 82 } 83 EXPORT_SYMBOL(ibcm_reject_msg); 84 85 struct cm_id_private; 86 struct cm_work; 87 static int cm_add_one(struct ib_device *device); 88 static void cm_remove_one(struct ib_device *device, void *client_data); 89 static void cm_process_work(struct cm_id_private *cm_id_priv, 90 struct cm_work *work); 91 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv, 92 struct ib_cm_sidr_rep_param *param); 93 static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv, 94 const void *private_data, u8 private_data_len); 95 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv, 96 void *private_data, u8 private_data_len); 97 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv, 98 enum ib_cm_rej_reason reason, void *ari, 99 u8 ari_length, const void *private_data, 100 u8 private_data_len); 101 102 static struct ib_client cm_client = { 103 .name = "cm", 104 .add = cm_add_one, 105 .remove = cm_remove_one 106 }; 107 108 static struct ib_cm { 109 spinlock_t lock; 110 struct list_head device_list; 111 rwlock_t device_lock; 112 struct rb_root listen_service_table; 113 u64 listen_service_id; 114 /* struct rb_root peer_service_table; todo: fix peer to peer */ 115 struct rb_root remote_qp_table; 116 struct rb_root remote_id_table; 117 struct rb_root remote_sidr_table; 118 struct xarray local_id_table; 119 u32 local_id_next; 120 __be32 random_id_operand; 121 struct list_head timewait_list; 122 struct workqueue_struct *wq; 123 /* Sync on cm change port state */ 124 spinlock_t state_lock; 125 } cm; 126 127 /* Counter indexes ordered by attribute ID */ 128 enum { 129 CM_REQ_COUNTER, 130 CM_MRA_COUNTER, 131 CM_REJ_COUNTER, 132 CM_REP_COUNTER, 133 CM_RTU_COUNTER, 134 CM_DREQ_COUNTER, 135 CM_DREP_COUNTER, 136 CM_SIDR_REQ_COUNTER, 137 CM_SIDR_REP_COUNTER, 138 CM_LAP_COUNTER, 139 CM_APR_COUNTER, 140 CM_ATTR_COUNT, 141 CM_ATTR_ID_OFFSET = 0x0010, 142 }; 143 144 enum { 145 CM_XMIT, 146 CM_XMIT_RETRIES, 147 CM_RECV, 148 CM_RECV_DUPLICATES, 149 CM_COUNTER_GROUPS 150 }; 151 152 static char const counter_group_names[CM_COUNTER_GROUPS] 153 [sizeof("cm_rx_duplicates")] = { 154 "cm_tx_msgs", "cm_tx_retries", 155 "cm_rx_msgs", "cm_rx_duplicates" 156 }; 157 158 struct cm_counter_group { 159 struct kobject obj; 160 atomic_long_t counter[CM_ATTR_COUNT]; 161 }; 162 163 struct cm_counter_attribute { 164 struct attribute attr; 165 int index; 166 }; 167 168 #define CM_COUNTER_ATTR(_name, _index) \ 169 struct cm_counter_attribute cm_##_name##_counter_attr = { \ 170 .attr = { .name = __stringify(_name), .mode = 0444 }, \ 171 .index = _index \ 172 } 173 174 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER); 175 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER); 176 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER); 177 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER); 178 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER); 179 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER); 180 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER); 181 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER); 182 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER); 183 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER); 184 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER); 185 186 static struct attribute *cm_counter_default_attrs[] = { 187 &cm_req_counter_attr.attr, 188 &cm_mra_counter_attr.attr, 189 &cm_rej_counter_attr.attr, 190 &cm_rep_counter_attr.attr, 191 &cm_rtu_counter_attr.attr, 192 &cm_dreq_counter_attr.attr, 193 &cm_drep_counter_attr.attr, 194 &cm_sidr_req_counter_attr.attr, 195 &cm_sidr_rep_counter_attr.attr, 196 &cm_lap_counter_attr.attr, 197 &cm_apr_counter_attr.attr, 198 NULL 199 }; 200 201 struct cm_port { 202 struct cm_device *cm_dev; 203 struct ib_mad_agent *mad_agent; 204 struct kobject port_obj; 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_irq(&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_irq(&cm.local_id_table, cm_local_id(cm_id_priv->id.local_id), 882 cm_id_priv, GFP_KERNEL); 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_irq(&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 goto out; 1526 } 1527 1528 ret = cm_init_av_by_path(param->primary_path, 1529 param->ppath_sgid_attr, &cm_id_priv->av, 1530 cm_id_priv); 1531 if (ret) 1532 goto out; 1533 if (param->alternate_path) { 1534 ret = cm_init_av_by_path(param->alternate_path, NULL, 1535 &cm_id_priv->alt_av, cm_id_priv); 1536 if (ret) 1537 goto out; 1538 } 1539 cm_id->service_id = param->service_id; 1540 cm_id->service_mask = ~cpu_to_be64(0); 1541 cm_id_priv->timeout_ms = cm_convert_to_ms( 1542 param->primary_path->packet_life_time) * 2 + 1543 cm_convert_to_ms( 1544 param->remote_cm_response_timeout); 1545 cm_id_priv->max_cm_retries = param->max_cm_retries; 1546 cm_id_priv->initiator_depth = param->initiator_depth; 1547 cm_id_priv->responder_resources = param->responder_resources; 1548 cm_id_priv->retry_count = param->retry_count; 1549 cm_id_priv->path_mtu = param->primary_path->mtu; 1550 cm_id_priv->pkey = param->primary_path->pkey; 1551 cm_id_priv->qp_type = param->qp_type; 1552 1553 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1554 if (ret) 1555 goto out; 1556 1557 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1558 cm_format_req(req_msg, cm_id_priv, param); 1559 cm_id_priv->tid = req_msg->hdr.tid; 1560 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1561 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1562 1563 cm_id_priv->local_qpn = cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg)); 1564 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg)); 1565 1566 spin_lock_irqsave(&cm_id_priv->lock, flags); 1567 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1568 if (ret) { 1569 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1570 goto error2; 1571 } 1572 BUG_ON(cm_id->state != IB_CM_IDLE); 1573 cm_id->state = IB_CM_REQ_SENT; 1574 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1575 return 0; 1576 1577 error2: cm_free_msg(cm_id_priv->msg); 1578 out: return ret; 1579 } 1580 EXPORT_SYMBOL(ib_send_cm_req); 1581 1582 static int cm_issue_rej(struct cm_port *port, 1583 struct ib_mad_recv_wc *mad_recv_wc, 1584 enum ib_cm_rej_reason reason, 1585 enum cm_msg_response msg_rejected, 1586 void *ari, u8 ari_length) 1587 { 1588 struct ib_mad_send_buf *msg = NULL; 1589 struct cm_rej_msg *rej_msg, *rcv_msg; 1590 int ret; 1591 1592 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1593 if (ret) 1594 return ret; 1595 1596 /* We just need common CM header information. Cast to any message. */ 1597 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1598 rej_msg = (struct cm_rej_msg *) msg->mad; 1599 1600 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1601 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg, 1602 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg)); 1603 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1604 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg)); 1605 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, msg_rejected); 1606 IBA_SET(CM_REJ_REASON, rej_msg, reason); 1607 1608 if (ari && ari_length) { 1609 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length); 1610 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length); 1611 } 1612 1613 ret = ib_post_send_mad(msg, NULL); 1614 if (ret) 1615 cm_free_msg(msg); 1616 1617 return ret; 1618 } 1619 1620 static bool cm_req_has_alt_path(struct cm_req_msg *req_msg) 1621 { 1622 return ((cpu_to_be16( 1623 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg))) || 1624 (ib_is_opa_gid(IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, 1625 req_msg)))); 1626 } 1627 1628 static void cm_path_set_rec_type(struct ib_device *ib_device, u8 port_num, 1629 struct sa_path_rec *path, union ib_gid *gid) 1630 { 1631 if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num)) 1632 path->rec_type = SA_PATH_REC_TYPE_OPA; 1633 else 1634 path->rec_type = SA_PATH_REC_TYPE_IB; 1635 } 1636 1637 static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg, 1638 struct sa_path_rec *primary_path, 1639 struct sa_path_rec *alt_path) 1640 { 1641 u32 lid; 1642 1643 if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) { 1644 sa_path_set_dlid(primary_path, 1645 IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID, 1646 req_msg)); 1647 sa_path_set_slid(primary_path, 1648 IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID, 1649 req_msg)); 1650 } else { 1651 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1652 CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg)); 1653 sa_path_set_dlid(primary_path, lid); 1654 1655 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1656 CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg)); 1657 sa_path_set_slid(primary_path, lid); 1658 } 1659 1660 if (!cm_req_has_alt_path(req_msg)) 1661 return; 1662 1663 if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) { 1664 sa_path_set_dlid(alt_path, 1665 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, 1666 req_msg)); 1667 sa_path_set_slid(alt_path, 1668 IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, 1669 req_msg)); 1670 } else { 1671 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1672 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg)); 1673 sa_path_set_dlid(alt_path, lid); 1674 1675 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1676 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg)); 1677 sa_path_set_slid(alt_path, lid); 1678 } 1679 } 1680 1681 static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1682 struct sa_path_rec *primary_path, 1683 struct sa_path_rec *alt_path) 1684 { 1685 primary_path->dgid = 1686 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg); 1687 primary_path->sgid = 1688 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg); 1689 primary_path->flow_label = 1690 cpu_to_be32(IBA_GET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg)); 1691 primary_path->hop_limit = IBA_GET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg); 1692 primary_path->traffic_class = 1693 IBA_GET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg); 1694 primary_path->reversible = 1; 1695 primary_path->pkey = 1696 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 1697 primary_path->sl = IBA_GET(CM_REQ_PRIMARY_SL, req_msg); 1698 primary_path->mtu_selector = IB_SA_EQ; 1699 primary_path->mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 1700 primary_path->rate_selector = IB_SA_EQ; 1701 primary_path->rate = IBA_GET(CM_REQ_PRIMARY_PACKET_RATE, req_msg); 1702 primary_path->packet_life_time_selector = IB_SA_EQ; 1703 primary_path->packet_life_time = 1704 IBA_GET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg); 1705 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1706 primary_path->service_id = 1707 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 1708 if (sa_path_is_roce(primary_path)) 1709 primary_path->roce.route_resolved = false; 1710 1711 if (cm_req_has_alt_path(req_msg)) { 1712 alt_path->dgid = *IBA_GET_MEM_PTR( 1713 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg); 1714 alt_path->sgid = *IBA_GET_MEM_PTR( 1715 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg); 1716 alt_path->flow_label = cpu_to_be32( 1717 IBA_GET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg)); 1718 alt_path->hop_limit = 1719 IBA_GET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg); 1720 alt_path->traffic_class = 1721 IBA_GET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg); 1722 alt_path->reversible = 1; 1723 alt_path->pkey = 1724 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 1725 alt_path->sl = IBA_GET(CM_REQ_ALTERNATE_SL, req_msg); 1726 alt_path->mtu_selector = IB_SA_EQ; 1727 alt_path->mtu = 1728 IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 1729 alt_path->rate_selector = IB_SA_EQ; 1730 alt_path->rate = IBA_GET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg); 1731 alt_path->packet_life_time_selector = IB_SA_EQ; 1732 alt_path->packet_life_time = 1733 IBA_GET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg); 1734 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1735 alt_path->service_id = 1736 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 1737 1738 if (sa_path_is_roce(alt_path)) 1739 alt_path->roce.route_resolved = false; 1740 } 1741 cm_format_path_lid_from_req(req_msg, primary_path, alt_path); 1742 } 1743 1744 static u16 cm_get_bth_pkey(struct cm_work *work) 1745 { 1746 struct ib_device *ib_dev = work->port->cm_dev->ib_device; 1747 u8 port_num = work->port->port_num; 1748 u16 pkey_index = work->mad_recv_wc->wc->pkey_index; 1749 u16 pkey; 1750 int ret; 1751 1752 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey); 1753 if (ret) { 1754 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n", 1755 port_num, pkey_index, ret); 1756 return 0; 1757 } 1758 1759 return pkey; 1760 } 1761 1762 /** 1763 * Convert OPA SGID to IB SGID 1764 * ULPs (such as IPoIB) do not understand OPA GIDs and will 1765 * reject them as the local_gid will not match the sgid. Therefore, 1766 * change the pathrec's SGID to an IB SGID. 1767 * 1768 * @work: Work completion 1769 * @path: Path record 1770 */ 1771 static void cm_opa_to_ib_sgid(struct cm_work *work, 1772 struct sa_path_rec *path) 1773 { 1774 struct ib_device *dev = work->port->cm_dev->ib_device; 1775 u8 port_num = work->port->port_num; 1776 1777 if (rdma_cap_opa_ah(dev, port_num) && 1778 (ib_is_opa_gid(&path->sgid))) { 1779 union ib_gid sgid; 1780 1781 if (rdma_query_gid(dev, port_num, 0, &sgid)) { 1782 dev_warn(&dev->dev, 1783 "Error updating sgid in CM request\n"); 1784 return; 1785 } 1786 1787 path->sgid = sgid; 1788 } 1789 } 1790 1791 static void cm_format_req_event(struct cm_work *work, 1792 struct cm_id_private *cm_id_priv, 1793 struct ib_cm_id *listen_id) 1794 { 1795 struct cm_req_msg *req_msg; 1796 struct ib_cm_req_event_param *param; 1797 1798 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1799 param = &work->cm_event.param.req_rcvd; 1800 param->listen_id = listen_id; 1801 param->bth_pkey = cm_get_bth_pkey(work); 1802 param->port = cm_id_priv->av.port->port_num; 1803 param->primary_path = &work->path[0]; 1804 cm_opa_to_ib_sgid(work, param->primary_path); 1805 if (cm_req_has_alt_path(req_msg)) { 1806 param->alternate_path = &work->path[1]; 1807 cm_opa_to_ib_sgid(work, param->alternate_path); 1808 } else { 1809 param->alternate_path = NULL; 1810 } 1811 param->remote_ca_guid = 1812 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg)); 1813 param->remote_qkey = IBA_GET(CM_REQ_LOCAL_Q_KEY, req_msg); 1814 param->remote_qpn = IBA_GET(CM_REQ_LOCAL_QPN, req_msg); 1815 param->qp_type = cm_req_get_qp_type(req_msg); 1816 param->starting_psn = IBA_GET(CM_REQ_STARTING_PSN, req_msg); 1817 param->responder_resources = IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg); 1818 param->initiator_depth = IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg); 1819 param->local_cm_response_timeout = 1820 IBA_GET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg); 1821 param->flow_control = IBA_GET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg); 1822 param->remote_cm_response_timeout = 1823 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg); 1824 param->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg); 1825 param->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg); 1826 param->srq = IBA_GET(CM_REQ_SRQ, req_msg); 1827 param->ppath_sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr; 1828 param->ece.vendor_id = IBA_GET(CM_REQ_VENDOR_ID, req_msg); 1829 param->ece.attr_mod = be32_to_cpu(req_msg->hdr.attr_mod); 1830 1831 work->cm_event.private_data = 1832 IBA_GET_MEM_PTR(CM_REQ_PRIVATE_DATA, req_msg); 1833 } 1834 1835 static void cm_process_work(struct cm_id_private *cm_id_priv, 1836 struct cm_work *work) 1837 { 1838 int ret; 1839 1840 /* We will typically only have the current event to report. */ 1841 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1842 cm_free_work(work); 1843 1844 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1845 spin_lock_irq(&cm_id_priv->lock); 1846 work = cm_dequeue_work(cm_id_priv); 1847 spin_unlock_irq(&cm_id_priv->lock); 1848 if (!work) 1849 return; 1850 1851 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1852 &work->cm_event); 1853 cm_free_work(work); 1854 } 1855 cm_deref_id(cm_id_priv); 1856 if (ret) 1857 cm_destroy_id(&cm_id_priv->id, ret); 1858 } 1859 1860 static void cm_format_mra(struct cm_mra_msg *mra_msg, 1861 struct cm_id_private *cm_id_priv, 1862 enum cm_msg_response msg_mraed, u8 service_timeout, 1863 const void *private_data, u8 private_data_len) 1864 { 1865 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1866 IBA_SET(CM_MRA_MESSAGE_MRAED, mra_msg, msg_mraed); 1867 IBA_SET(CM_MRA_LOCAL_COMM_ID, mra_msg, 1868 be32_to_cpu(cm_id_priv->id.local_id)); 1869 IBA_SET(CM_MRA_REMOTE_COMM_ID, mra_msg, 1870 be32_to_cpu(cm_id_priv->id.remote_id)); 1871 IBA_SET(CM_MRA_SERVICE_TIMEOUT, mra_msg, service_timeout); 1872 1873 if (private_data && private_data_len) 1874 IBA_SET_MEM(CM_MRA_PRIVATE_DATA, mra_msg, private_data, 1875 private_data_len); 1876 } 1877 1878 static void cm_format_rej(struct cm_rej_msg *rej_msg, 1879 struct cm_id_private *cm_id_priv, 1880 enum ib_cm_rej_reason reason, void *ari, 1881 u8 ari_length, const void *private_data, 1882 u8 private_data_len, enum ib_cm_state state) 1883 { 1884 lockdep_assert_held(&cm_id_priv->lock); 1885 1886 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1887 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg, 1888 be32_to_cpu(cm_id_priv->id.remote_id)); 1889 1890 switch (state) { 1891 case IB_CM_REQ_RCVD: 1892 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, be32_to_cpu(0)); 1893 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ); 1894 break; 1895 case IB_CM_MRA_REQ_SENT: 1896 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1897 be32_to_cpu(cm_id_priv->id.local_id)); 1898 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ); 1899 break; 1900 case IB_CM_REP_RCVD: 1901 case IB_CM_MRA_REP_SENT: 1902 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1903 be32_to_cpu(cm_id_priv->id.local_id)); 1904 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REP); 1905 break; 1906 default: 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, 1910 CM_MSG_RESPONSE_OTHER); 1911 break; 1912 } 1913 1914 IBA_SET(CM_REJ_REASON, rej_msg, reason); 1915 if (ari && ari_length) { 1916 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length); 1917 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length); 1918 } 1919 1920 if (private_data && private_data_len) 1921 IBA_SET_MEM(CM_REJ_PRIVATE_DATA, rej_msg, private_data, 1922 private_data_len); 1923 } 1924 1925 static void cm_dup_req_handler(struct cm_work *work, 1926 struct cm_id_private *cm_id_priv) 1927 { 1928 struct ib_mad_send_buf *msg = NULL; 1929 int ret; 1930 1931 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1932 counter[CM_REQ_COUNTER]); 1933 1934 /* Quick state check to discard duplicate REQs. */ 1935 spin_lock_irq(&cm_id_priv->lock); 1936 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) { 1937 spin_unlock_irq(&cm_id_priv->lock); 1938 return; 1939 } 1940 spin_unlock_irq(&cm_id_priv->lock); 1941 1942 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1943 if (ret) 1944 return; 1945 1946 spin_lock_irq(&cm_id_priv->lock); 1947 switch (cm_id_priv->id.state) { 1948 case IB_CM_MRA_REQ_SENT: 1949 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1950 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1951 cm_id_priv->private_data, 1952 cm_id_priv->private_data_len); 1953 break; 1954 case IB_CM_TIMEWAIT: 1955 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, 1956 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0, 1957 IB_CM_TIMEWAIT); 1958 break; 1959 default: 1960 goto unlock; 1961 } 1962 spin_unlock_irq(&cm_id_priv->lock); 1963 1964 ret = ib_post_send_mad(msg, NULL); 1965 if (ret) 1966 goto free; 1967 return; 1968 1969 unlock: spin_unlock_irq(&cm_id_priv->lock); 1970 free: cm_free_msg(msg); 1971 } 1972 1973 static struct cm_id_private * cm_match_req(struct cm_work *work, 1974 struct cm_id_private *cm_id_priv) 1975 { 1976 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1977 struct cm_timewait_info *timewait_info; 1978 struct cm_req_msg *req_msg; 1979 1980 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1981 1982 /* Check for possible duplicate REQ. */ 1983 spin_lock_irq(&cm.lock); 1984 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1985 if (timewait_info) { 1986 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 1987 timewait_info->work.remote_id); 1988 spin_unlock_irq(&cm.lock); 1989 if (cur_cm_id_priv) { 1990 cm_dup_req_handler(work, cur_cm_id_priv); 1991 cm_deref_id(cur_cm_id_priv); 1992 } 1993 return NULL; 1994 } 1995 1996 /* Check for stale connections. */ 1997 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1998 if (timewait_info) { 1999 cm_remove_remote(cm_id_priv); 2000 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2001 timewait_info->work.remote_id); 2002 2003 spin_unlock_irq(&cm.lock); 2004 cm_issue_rej(work->port, work->mad_recv_wc, 2005 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 2006 NULL, 0); 2007 if (cur_cm_id_priv) { 2008 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0); 2009 cm_deref_id(cur_cm_id_priv); 2010 } 2011 return NULL; 2012 } 2013 2014 /* Find matching listen request. */ 2015 listen_cm_id_priv = cm_find_listen( 2016 cm_id_priv->id.device, 2017 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg))); 2018 if (!listen_cm_id_priv) { 2019 cm_remove_remote(cm_id_priv); 2020 spin_unlock_irq(&cm.lock); 2021 cm_issue_rej(work->port, work->mad_recv_wc, 2022 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 2023 NULL, 0); 2024 return NULL; 2025 } 2026 spin_unlock_irq(&cm.lock); 2027 return listen_cm_id_priv; 2028 } 2029 2030 /* 2031 * Work-around for inter-subnet connections. If the LIDs are permissive, 2032 * we need to override the LID/SL data in the REQ with the LID information 2033 * in the work completion. 2034 */ 2035 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 2036 { 2037 if (!IBA_GET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg)) { 2038 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID, 2039 req_msg)) == IB_LID_PERMISSIVE) { 2040 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 2041 be16_to_cpu(ib_lid_be16(wc->slid))); 2042 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, wc->sl); 2043 } 2044 2045 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID, 2046 req_msg)) == IB_LID_PERMISSIVE) 2047 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, 2048 wc->dlid_path_bits); 2049 } 2050 2051 if (!IBA_GET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg)) { 2052 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, 2053 req_msg)) == IB_LID_PERMISSIVE) { 2054 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, 2055 be16_to_cpu(ib_lid_be16(wc->slid))); 2056 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, wc->sl); 2057 } 2058 2059 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, 2060 req_msg)) == IB_LID_PERMISSIVE) 2061 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, 2062 wc->dlid_path_bits); 2063 } 2064 } 2065 2066 static int cm_req_handler(struct cm_work *work) 2067 { 2068 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 2069 struct cm_req_msg *req_msg; 2070 const struct ib_global_route *grh; 2071 const struct ib_gid_attr *gid_attr; 2072 int ret; 2073 2074 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 2075 2076 cm_id_priv = 2077 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL); 2078 if (IS_ERR(cm_id_priv)) 2079 return PTR_ERR(cm_id_priv); 2080 2081 cm_id_priv->id.remote_id = 2082 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_COMM_ID, req_msg)); 2083 cm_id_priv->id.service_id = 2084 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 2085 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 2086 cm_id_priv->tid = req_msg->hdr.tid; 2087 cm_id_priv->timeout_ms = cm_convert_to_ms( 2088 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg)); 2089 cm_id_priv->max_cm_retries = IBA_GET(CM_REQ_MAX_CM_RETRIES, req_msg); 2090 cm_id_priv->remote_qpn = 2091 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg)); 2092 cm_id_priv->initiator_depth = 2093 IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg); 2094 cm_id_priv->responder_resources = 2095 IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg); 2096 cm_id_priv->path_mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 2097 cm_id_priv->pkey = cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 2098 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg)); 2099 cm_id_priv->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg); 2100 cm_id_priv->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg); 2101 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 2102 2103 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2104 work->mad_recv_wc->recv_buf.grh, 2105 &cm_id_priv->av); 2106 if (ret) 2107 goto destroy; 2108 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 2109 id.local_id); 2110 if (IS_ERR(cm_id_priv->timewait_info)) { 2111 ret = PTR_ERR(cm_id_priv->timewait_info); 2112 goto destroy; 2113 } 2114 cm_id_priv->timewait_info->work.remote_id = cm_id_priv->id.remote_id; 2115 cm_id_priv->timewait_info->remote_ca_guid = 2116 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg)); 2117 cm_id_priv->timewait_info->remote_qpn = cm_id_priv->remote_qpn; 2118 2119 /* 2120 * Note that the ID pointer is not in the xarray at this point, 2121 * so this set is only visible to the local thread. 2122 */ 2123 cm_id_priv->id.state = IB_CM_REQ_RCVD; 2124 2125 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 2126 if (!listen_cm_id_priv) { 2127 pr_debug("%s: local_id %d, no listen_cm_id_priv\n", __func__, 2128 be32_to_cpu(cm_id_priv->id.local_id)); 2129 cm_id_priv->id.state = IB_CM_IDLE; 2130 ret = -EINVAL; 2131 goto destroy; 2132 } 2133 2134 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 2135 2136 memset(&work->path[0], 0, sizeof(work->path[0])); 2137 if (cm_req_has_alt_path(req_msg)) 2138 memset(&work->path[1], 0, sizeof(work->path[1])); 2139 grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr); 2140 gid_attr = grh->sgid_attr; 2141 2142 if (gid_attr && 2143 rdma_protocol_roce(work->port->cm_dev->ib_device, 2144 work->port->port_num)) { 2145 work->path[0].rec_type = 2146 sa_conv_gid_to_pathrec_type(gid_attr->gid_type); 2147 } else { 2148 cm_path_set_rec_type( 2149 work->port->cm_dev->ib_device, work->port->port_num, 2150 &work->path[0], 2151 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, 2152 req_msg)); 2153 } 2154 if (cm_req_has_alt_path(req_msg)) 2155 work->path[1].rec_type = work->path[0].rec_type; 2156 cm_format_paths_from_req(req_msg, &work->path[0], 2157 &work->path[1]); 2158 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE) 2159 sa_path_set_dmac(&work->path[0], 2160 cm_id_priv->av.ah_attr.roce.dmac); 2161 work->path[0].hop_limit = grh->hop_limit; 2162 ret = cm_init_av_by_path(&work->path[0], gid_attr, &cm_id_priv->av, 2163 cm_id_priv); 2164 if (ret) { 2165 int err; 2166 2167 err = rdma_query_gid(work->port->cm_dev->ib_device, 2168 work->port->port_num, 0, 2169 &work->path[0].sgid); 2170 if (err) 2171 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID, 2172 NULL, 0, NULL, 0); 2173 else 2174 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID, 2175 &work->path[0].sgid, 2176 sizeof(work->path[0].sgid), 2177 NULL, 0); 2178 goto rejected; 2179 } 2180 if (cm_req_has_alt_path(req_msg)) { 2181 ret = cm_init_av_by_path(&work->path[1], NULL, 2182 &cm_id_priv->alt_av, cm_id_priv); 2183 if (ret) { 2184 ib_send_cm_rej(&cm_id_priv->id, 2185 IB_CM_REJ_INVALID_ALT_GID, 2186 &work->path[0].sgid, 2187 sizeof(work->path[0].sgid), NULL, 0); 2188 goto rejected; 2189 } 2190 } 2191 2192 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 2193 cm_id_priv->id.context = listen_cm_id_priv->id.context; 2194 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 2195 2196 /* Now MAD handlers can see the new ID */ 2197 spin_lock_irq(&cm_id_priv->lock); 2198 cm_finalize_id(cm_id_priv); 2199 2200 /* Refcount belongs to the event, pairs with cm_process_work() */ 2201 refcount_inc(&cm_id_priv->refcount); 2202 cm_queue_work_unlock(cm_id_priv, work); 2203 /* 2204 * Since this ID was just created and was not made visible to other MAD 2205 * handlers until the cm_finalize_id() above we know that the 2206 * cm_process_work() will deliver the event and the listen_cm_id 2207 * embedded in the event can be derefed here. 2208 */ 2209 cm_deref_id(listen_cm_id_priv); 2210 return 0; 2211 2212 rejected: 2213 cm_deref_id(listen_cm_id_priv); 2214 destroy: 2215 ib_destroy_cm_id(&cm_id_priv->id); 2216 return ret; 2217 } 2218 2219 static void cm_format_rep(struct cm_rep_msg *rep_msg, 2220 struct cm_id_private *cm_id_priv, 2221 struct ib_cm_rep_param *param) 2222 { 2223 cm_format_mad_ece_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid, 2224 param->ece.attr_mod); 2225 IBA_SET(CM_REP_LOCAL_COMM_ID, rep_msg, 2226 be32_to_cpu(cm_id_priv->id.local_id)); 2227 IBA_SET(CM_REP_REMOTE_COMM_ID, rep_msg, 2228 be32_to_cpu(cm_id_priv->id.remote_id)); 2229 IBA_SET(CM_REP_STARTING_PSN, rep_msg, param->starting_psn); 2230 IBA_SET(CM_REP_RESPONDER_RESOURCES, rep_msg, 2231 param->responder_resources); 2232 IBA_SET(CM_REP_TARGET_ACK_DELAY, rep_msg, 2233 cm_id_priv->av.port->cm_dev->ack_delay); 2234 IBA_SET(CM_REP_FAILOVER_ACCEPTED, rep_msg, param->failover_accepted); 2235 IBA_SET(CM_REP_RNR_RETRY_COUNT, rep_msg, param->rnr_retry_count); 2236 IBA_SET(CM_REP_LOCAL_CA_GUID, rep_msg, 2237 be64_to_cpu(cm_id_priv->id.device->node_guid)); 2238 2239 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) { 2240 IBA_SET(CM_REP_INITIATOR_DEPTH, rep_msg, 2241 param->initiator_depth); 2242 IBA_SET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg, 2243 param->flow_control); 2244 IBA_SET(CM_REP_SRQ, rep_msg, param->srq); 2245 IBA_SET(CM_REP_LOCAL_QPN, rep_msg, param->qp_num); 2246 } else { 2247 IBA_SET(CM_REP_SRQ, rep_msg, 1); 2248 IBA_SET(CM_REP_LOCAL_EE_CONTEXT_NUMBER, rep_msg, param->qp_num); 2249 } 2250 2251 IBA_SET(CM_REP_VENDOR_ID_L, rep_msg, param->ece.vendor_id); 2252 IBA_SET(CM_REP_VENDOR_ID_M, rep_msg, param->ece.vendor_id >> 8); 2253 IBA_SET(CM_REP_VENDOR_ID_H, rep_msg, param->ece.vendor_id >> 16); 2254 2255 if (param->private_data && param->private_data_len) 2256 IBA_SET_MEM(CM_REP_PRIVATE_DATA, rep_msg, param->private_data, 2257 param->private_data_len); 2258 } 2259 2260 int ib_send_cm_rep(struct ib_cm_id *cm_id, 2261 struct ib_cm_rep_param *param) 2262 { 2263 struct cm_id_private *cm_id_priv; 2264 struct ib_mad_send_buf *msg; 2265 struct cm_rep_msg *rep_msg; 2266 unsigned long flags; 2267 int ret; 2268 2269 if (param->private_data && 2270 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 2271 return -EINVAL; 2272 2273 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2274 spin_lock_irqsave(&cm_id_priv->lock, flags); 2275 if (cm_id->state != IB_CM_REQ_RCVD && 2276 cm_id->state != IB_CM_MRA_REQ_SENT) { 2277 pr_debug("%s: local_comm_id %d, cm_id->state: %d\n", __func__, 2278 be32_to_cpu(cm_id_priv->id.local_id), cm_id->state); 2279 ret = -EINVAL; 2280 goto out; 2281 } 2282 2283 ret = cm_alloc_msg(cm_id_priv, &msg); 2284 if (ret) 2285 goto out; 2286 2287 rep_msg = (struct cm_rep_msg *) msg->mad; 2288 cm_format_rep(rep_msg, cm_id_priv, param); 2289 msg->timeout_ms = cm_id_priv->timeout_ms; 2290 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 2291 2292 ret = ib_post_send_mad(msg, NULL); 2293 if (ret) { 2294 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2295 cm_free_msg(msg); 2296 return ret; 2297 } 2298 2299 cm_id->state = IB_CM_REP_SENT; 2300 cm_id_priv->msg = msg; 2301 cm_id_priv->initiator_depth = param->initiator_depth; 2302 cm_id_priv->responder_resources = param->responder_resources; 2303 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg)); 2304 WARN_ONCE(param->qp_num & 0xFF000000, 2305 "IBTA declares QPN to be 24 bits, but it is 0x%X\n", 2306 param->qp_num); 2307 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF); 2308 2309 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2310 return ret; 2311 } 2312 EXPORT_SYMBOL(ib_send_cm_rep); 2313 2314 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 2315 struct cm_id_private *cm_id_priv, 2316 const void *private_data, 2317 u8 private_data_len) 2318 { 2319 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 2320 IBA_SET(CM_RTU_LOCAL_COMM_ID, rtu_msg, 2321 be32_to_cpu(cm_id_priv->id.local_id)); 2322 IBA_SET(CM_RTU_REMOTE_COMM_ID, rtu_msg, 2323 be32_to_cpu(cm_id_priv->id.remote_id)); 2324 2325 if (private_data && private_data_len) 2326 IBA_SET_MEM(CM_RTU_PRIVATE_DATA, rtu_msg, private_data, 2327 private_data_len); 2328 } 2329 2330 int ib_send_cm_rtu(struct ib_cm_id *cm_id, 2331 const void *private_data, 2332 u8 private_data_len) 2333 { 2334 struct cm_id_private *cm_id_priv; 2335 struct ib_mad_send_buf *msg; 2336 unsigned long flags; 2337 void *data; 2338 int ret; 2339 2340 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 2341 return -EINVAL; 2342 2343 data = cm_copy_private_data(private_data, private_data_len); 2344 if (IS_ERR(data)) 2345 return PTR_ERR(data); 2346 2347 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2348 spin_lock_irqsave(&cm_id_priv->lock, flags); 2349 if (cm_id->state != IB_CM_REP_RCVD && 2350 cm_id->state != IB_CM_MRA_REP_SENT) { 2351 pr_debug("%s: local_id %d, cm_id->state %d\n", __func__, 2352 be32_to_cpu(cm_id->local_id), cm_id->state); 2353 ret = -EINVAL; 2354 goto error; 2355 } 2356 2357 ret = cm_alloc_msg(cm_id_priv, &msg); 2358 if (ret) 2359 goto error; 2360 2361 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 2362 private_data, private_data_len); 2363 2364 ret = ib_post_send_mad(msg, NULL); 2365 if (ret) { 2366 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2367 cm_free_msg(msg); 2368 kfree(data); 2369 return ret; 2370 } 2371 2372 cm_id->state = IB_CM_ESTABLISHED; 2373 cm_set_private_data(cm_id_priv, data, private_data_len); 2374 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2375 return 0; 2376 2377 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2378 kfree(data); 2379 return ret; 2380 } 2381 EXPORT_SYMBOL(ib_send_cm_rtu); 2382 2383 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type) 2384 { 2385 struct cm_rep_msg *rep_msg; 2386 struct ib_cm_rep_event_param *param; 2387 2388 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 2389 param = &work->cm_event.param.rep_rcvd; 2390 param->remote_ca_guid = 2391 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg)); 2392 param->remote_qkey = IBA_GET(CM_REP_LOCAL_Q_KEY, rep_msg); 2393 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type)); 2394 param->starting_psn = IBA_GET(CM_REP_STARTING_PSN, rep_msg); 2395 param->responder_resources = IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg); 2396 param->initiator_depth = IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg); 2397 param->target_ack_delay = IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg); 2398 param->failover_accepted = IBA_GET(CM_REP_FAILOVER_ACCEPTED, rep_msg); 2399 param->flow_control = IBA_GET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg); 2400 param->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg); 2401 param->srq = IBA_GET(CM_REP_SRQ, rep_msg); 2402 param->ece.vendor_id = IBA_GET(CM_REP_VENDOR_ID_H, rep_msg) << 16; 2403 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_M, rep_msg) << 8; 2404 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_L, rep_msg); 2405 param->ece.attr_mod = be32_to_cpu(rep_msg->hdr.attr_mod); 2406 2407 work->cm_event.private_data = 2408 IBA_GET_MEM_PTR(CM_REP_PRIVATE_DATA, rep_msg); 2409 } 2410 2411 static void cm_dup_rep_handler(struct cm_work *work) 2412 { 2413 struct cm_id_private *cm_id_priv; 2414 struct cm_rep_msg *rep_msg; 2415 struct ib_mad_send_buf *msg = NULL; 2416 int ret; 2417 2418 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 2419 cm_id_priv = cm_acquire_id( 2420 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 2421 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg))); 2422 if (!cm_id_priv) 2423 return; 2424 2425 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2426 counter[CM_REP_COUNTER]); 2427 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 2428 if (ret) 2429 goto deref; 2430 2431 spin_lock_irq(&cm_id_priv->lock); 2432 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 2433 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 2434 cm_id_priv->private_data, 2435 cm_id_priv->private_data_len); 2436 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 2437 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2438 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 2439 cm_id_priv->private_data, 2440 cm_id_priv->private_data_len); 2441 else 2442 goto unlock; 2443 spin_unlock_irq(&cm_id_priv->lock); 2444 2445 ret = ib_post_send_mad(msg, NULL); 2446 if (ret) 2447 goto free; 2448 goto deref; 2449 2450 unlock: spin_unlock_irq(&cm_id_priv->lock); 2451 free: cm_free_msg(msg); 2452 deref: cm_deref_id(cm_id_priv); 2453 } 2454 2455 static int cm_rep_handler(struct cm_work *work) 2456 { 2457 struct cm_id_private *cm_id_priv; 2458 struct cm_rep_msg *rep_msg; 2459 int ret; 2460 struct cm_id_private *cur_cm_id_priv; 2461 struct cm_timewait_info *timewait_info; 2462 2463 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 2464 cm_id_priv = cm_acquire_id( 2465 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 0); 2466 if (!cm_id_priv) { 2467 cm_dup_rep_handler(work); 2468 pr_debug("%s: remote_comm_id %d, no cm_id_priv\n", __func__, 2469 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2470 return -EINVAL; 2471 } 2472 2473 cm_format_rep_event(work, cm_id_priv->qp_type); 2474 2475 spin_lock_irq(&cm_id_priv->lock); 2476 switch (cm_id_priv->id.state) { 2477 case IB_CM_REQ_SENT: 2478 case IB_CM_MRA_REQ_RCVD: 2479 break; 2480 default: 2481 ret = -EINVAL; 2482 pr_debug( 2483 "%s: cm_id_priv->id.state: %d, local_comm_id %d, remote_comm_id %d\n", 2484 __func__, cm_id_priv->id.state, 2485 IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg), 2486 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2487 spin_unlock_irq(&cm_id_priv->lock); 2488 goto error; 2489 } 2490 2491 cm_id_priv->timewait_info->work.remote_id = 2492 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)); 2493 cm_id_priv->timewait_info->remote_ca_guid = 2494 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg)); 2495 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2496 2497 spin_lock(&cm.lock); 2498 /* Check for duplicate REP. */ 2499 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 2500 spin_unlock(&cm.lock); 2501 spin_unlock_irq(&cm_id_priv->lock); 2502 ret = -EINVAL; 2503 pr_debug("%s: Failed to insert remote id %d\n", __func__, 2504 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2505 goto error; 2506 } 2507 /* Check for a stale connection. */ 2508 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 2509 if (timewait_info) { 2510 cm_remove_remote(cm_id_priv); 2511 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2512 timewait_info->work.remote_id); 2513 2514 spin_unlock(&cm.lock); 2515 spin_unlock_irq(&cm_id_priv->lock); 2516 cm_issue_rej(work->port, work->mad_recv_wc, 2517 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 2518 NULL, 0); 2519 ret = -EINVAL; 2520 pr_debug( 2521 "%s: Stale connection. local_comm_id %d, remote_comm_id %d\n", 2522 __func__, IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg), 2523 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2524 2525 if (cur_cm_id_priv) { 2526 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0); 2527 cm_deref_id(cur_cm_id_priv); 2528 } 2529 2530 goto error; 2531 } 2532 spin_unlock(&cm.lock); 2533 2534 cm_id_priv->id.state = IB_CM_REP_RCVD; 2535 cm_id_priv->id.remote_id = 2536 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)); 2537 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2538 cm_id_priv->initiator_depth = 2539 IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg); 2540 cm_id_priv->responder_resources = 2541 IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg); 2542 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg)); 2543 cm_id_priv->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg); 2544 cm_id_priv->target_ack_delay = 2545 IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg); 2546 cm_id_priv->av.timeout = 2547 cm_ack_timeout(cm_id_priv->target_ack_delay, 2548 cm_id_priv->av.timeout - 1); 2549 cm_id_priv->alt_av.timeout = 2550 cm_ack_timeout(cm_id_priv->target_ack_delay, 2551 cm_id_priv->alt_av.timeout - 1); 2552 2553 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2554 cm_queue_work_unlock(cm_id_priv, work); 2555 return 0; 2556 2557 error: 2558 cm_deref_id(cm_id_priv); 2559 return ret; 2560 } 2561 2562 static int cm_establish_handler(struct cm_work *work) 2563 { 2564 struct cm_id_private *cm_id_priv; 2565 2566 /* See comment in cm_establish about lookup. */ 2567 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 2568 if (!cm_id_priv) 2569 return -EINVAL; 2570 2571 spin_lock_irq(&cm_id_priv->lock); 2572 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 2573 spin_unlock_irq(&cm_id_priv->lock); 2574 goto out; 2575 } 2576 2577 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2578 cm_queue_work_unlock(cm_id_priv, work); 2579 return 0; 2580 out: 2581 cm_deref_id(cm_id_priv); 2582 return -EINVAL; 2583 } 2584 2585 static int cm_rtu_handler(struct cm_work *work) 2586 { 2587 struct cm_id_private *cm_id_priv; 2588 struct cm_rtu_msg *rtu_msg; 2589 2590 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 2591 cm_id_priv = cm_acquire_id( 2592 cpu_to_be32(IBA_GET(CM_RTU_REMOTE_COMM_ID, rtu_msg)), 2593 cpu_to_be32(IBA_GET(CM_RTU_LOCAL_COMM_ID, rtu_msg))); 2594 if (!cm_id_priv) 2595 return -EINVAL; 2596 2597 work->cm_event.private_data = 2598 IBA_GET_MEM_PTR(CM_RTU_PRIVATE_DATA, rtu_msg); 2599 2600 spin_lock_irq(&cm_id_priv->lock); 2601 if (cm_id_priv->id.state != IB_CM_REP_SENT && 2602 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 2603 spin_unlock_irq(&cm_id_priv->lock); 2604 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2605 counter[CM_RTU_COUNTER]); 2606 goto out; 2607 } 2608 cm_id_priv->id.state = IB_CM_ESTABLISHED; 2609 2610 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2611 cm_queue_work_unlock(cm_id_priv, work); 2612 return 0; 2613 out: 2614 cm_deref_id(cm_id_priv); 2615 return -EINVAL; 2616 } 2617 2618 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 2619 struct cm_id_private *cm_id_priv, 2620 const void *private_data, 2621 u8 private_data_len) 2622 { 2623 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 2624 cm_form_tid(cm_id_priv)); 2625 IBA_SET(CM_DREQ_LOCAL_COMM_ID, dreq_msg, 2626 be32_to_cpu(cm_id_priv->id.local_id)); 2627 IBA_SET(CM_DREQ_REMOTE_COMM_ID, dreq_msg, 2628 be32_to_cpu(cm_id_priv->id.remote_id)); 2629 IBA_SET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg, 2630 be32_to_cpu(cm_id_priv->remote_qpn)); 2631 2632 if (private_data && private_data_len) 2633 IBA_SET_MEM(CM_DREQ_PRIVATE_DATA, dreq_msg, private_data, 2634 private_data_len); 2635 } 2636 2637 static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv, 2638 const void *private_data, u8 private_data_len) 2639 { 2640 struct ib_mad_send_buf *msg; 2641 int ret; 2642 2643 lockdep_assert_held(&cm_id_priv->lock); 2644 2645 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 2646 return -EINVAL; 2647 2648 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 2649 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__, 2650 be32_to_cpu(cm_id_priv->id.local_id), 2651 cm_id_priv->id.state); 2652 return -EINVAL; 2653 } 2654 2655 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2656 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2657 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2658 2659 ret = cm_alloc_msg(cm_id_priv, &msg); 2660 if (ret) { 2661 cm_enter_timewait(cm_id_priv); 2662 return ret; 2663 } 2664 2665 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 2666 private_data, private_data_len); 2667 msg->timeout_ms = cm_id_priv->timeout_ms; 2668 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2669 2670 ret = ib_post_send_mad(msg, NULL); 2671 if (ret) { 2672 cm_enter_timewait(cm_id_priv); 2673 cm_free_msg(msg); 2674 return ret; 2675 } 2676 2677 cm_id_priv->id.state = IB_CM_DREQ_SENT; 2678 cm_id_priv->msg = msg; 2679 return 0; 2680 } 2681 2682 int ib_send_cm_dreq(struct ib_cm_id *cm_id, const void *private_data, 2683 u8 private_data_len) 2684 { 2685 struct cm_id_private *cm_id_priv = 2686 container_of(cm_id, struct cm_id_private, id); 2687 unsigned long flags; 2688 int ret; 2689 2690 spin_lock_irqsave(&cm_id_priv->lock, flags); 2691 ret = cm_send_dreq_locked(cm_id_priv, private_data, private_data_len); 2692 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2693 return ret; 2694 } 2695 EXPORT_SYMBOL(ib_send_cm_dreq); 2696 2697 static void cm_format_drep(struct cm_drep_msg *drep_msg, 2698 struct cm_id_private *cm_id_priv, 2699 const void *private_data, 2700 u8 private_data_len) 2701 { 2702 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2703 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg, 2704 be32_to_cpu(cm_id_priv->id.local_id)); 2705 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg, 2706 be32_to_cpu(cm_id_priv->id.remote_id)); 2707 2708 if (private_data && private_data_len) 2709 IBA_SET_MEM(CM_DREP_PRIVATE_DATA, drep_msg, private_data, 2710 private_data_len); 2711 } 2712 2713 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv, 2714 void *private_data, u8 private_data_len) 2715 { 2716 struct ib_mad_send_buf *msg; 2717 int ret; 2718 2719 lockdep_assert_held(&cm_id_priv->lock); 2720 2721 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2722 return -EINVAL; 2723 2724 if (cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2725 pr_debug( 2726 "%s: local_id %d, cm_idcm_id->state(%d) != IB_CM_DREQ_RCVD\n", 2727 __func__, be32_to_cpu(cm_id_priv->id.local_id), 2728 cm_id_priv->id.state); 2729 kfree(private_data); 2730 return -EINVAL; 2731 } 2732 2733 cm_set_private_data(cm_id_priv, private_data, private_data_len); 2734 cm_enter_timewait(cm_id_priv); 2735 2736 ret = cm_alloc_msg(cm_id_priv, &msg); 2737 if (ret) 2738 return ret; 2739 2740 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2741 private_data, private_data_len); 2742 2743 ret = ib_post_send_mad(msg, NULL); 2744 if (ret) { 2745 cm_free_msg(msg); 2746 return ret; 2747 } 2748 return 0; 2749 } 2750 2751 int ib_send_cm_drep(struct ib_cm_id *cm_id, const void *private_data, 2752 u8 private_data_len) 2753 { 2754 struct cm_id_private *cm_id_priv = 2755 container_of(cm_id, struct cm_id_private, id); 2756 unsigned long flags; 2757 void *data; 2758 int ret; 2759 2760 data = cm_copy_private_data(private_data, private_data_len); 2761 if (IS_ERR(data)) 2762 return PTR_ERR(data); 2763 2764 spin_lock_irqsave(&cm_id_priv->lock, flags); 2765 ret = cm_send_drep_locked(cm_id_priv, data, private_data_len); 2766 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2767 return ret; 2768 } 2769 EXPORT_SYMBOL(ib_send_cm_drep); 2770 2771 static int cm_issue_drep(struct cm_port *port, 2772 struct ib_mad_recv_wc *mad_recv_wc) 2773 { 2774 struct ib_mad_send_buf *msg = NULL; 2775 struct cm_dreq_msg *dreq_msg; 2776 struct cm_drep_msg *drep_msg; 2777 int ret; 2778 2779 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2780 if (ret) 2781 return ret; 2782 2783 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2784 drep_msg = (struct cm_drep_msg *) msg->mad; 2785 2786 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2787 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg, 2788 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg)); 2789 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg, 2790 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)); 2791 2792 ret = ib_post_send_mad(msg, NULL); 2793 if (ret) 2794 cm_free_msg(msg); 2795 2796 return ret; 2797 } 2798 2799 static int cm_dreq_handler(struct cm_work *work) 2800 { 2801 struct cm_id_private *cm_id_priv; 2802 struct cm_dreq_msg *dreq_msg; 2803 struct ib_mad_send_buf *msg = NULL; 2804 2805 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2806 cm_id_priv = cm_acquire_id( 2807 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)), 2808 cpu_to_be32(IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg))); 2809 if (!cm_id_priv) { 2810 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2811 counter[CM_DREQ_COUNTER]); 2812 cm_issue_drep(work->port, work->mad_recv_wc); 2813 pr_debug( 2814 "%s: no cm_id_priv, local_comm_id %d, remote_comm_id %d\n", 2815 __func__, IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg), 2816 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)); 2817 return -EINVAL; 2818 } 2819 2820 work->cm_event.private_data = 2821 IBA_GET_MEM_PTR(CM_DREQ_PRIVATE_DATA, dreq_msg); 2822 2823 spin_lock_irq(&cm_id_priv->lock); 2824 if (cm_id_priv->local_qpn != 2825 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg))) 2826 goto unlock; 2827 2828 switch (cm_id_priv->id.state) { 2829 case IB_CM_REP_SENT: 2830 case IB_CM_DREQ_SENT: 2831 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2832 break; 2833 case IB_CM_ESTABLISHED: 2834 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2835 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2836 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2837 break; 2838 case IB_CM_MRA_REP_RCVD: 2839 break; 2840 case IB_CM_TIMEWAIT: 2841 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2842 counter[CM_DREQ_COUNTER]); 2843 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc); 2844 if (IS_ERR(msg)) 2845 goto unlock; 2846 2847 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2848 cm_id_priv->private_data, 2849 cm_id_priv->private_data_len); 2850 spin_unlock_irq(&cm_id_priv->lock); 2851 2852 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || 2853 ib_post_send_mad(msg, NULL)) 2854 cm_free_msg(msg); 2855 goto deref; 2856 case IB_CM_DREQ_RCVD: 2857 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2858 counter[CM_DREQ_COUNTER]); 2859 goto unlock; 2860 default: 2861 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n", 2862 __func__, be32_to_cpu(cm_id_priv->id.local_id), 2863 cm_id_priv->id.state); 2864 goto unlock; 2865 } 2866 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2867 cm_id_priv->tid = dreq_msg->hdr.tid; 2868 cm_queue_work_unlock(cm_id_priv, work); 2869 return 0; 2870 2871 unlock: spin_unlock_irq(&cm_id_priv->lock); 2872 deref: cm_deref_id(cm_id_priv); 2873 return -EINVAL; 2874 } 2875 2876 static int cm_drep_handler(struct cm_work *work) 2877 { 2878 struct cm_id_private *cm_id_priv; 2879 struct cm_drep_msg *drep_msg; 2880 2881 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2882 cm_id_priv = cm_acquire_id( 2883 cpu_to_be32(IBA_GET(CM_DREP_REMOTE_COMM_ID, drep_msg)), 2884 cpu_to_be32(IBA_GET(CM_DREP_LOCAL_COMM_ID, drep_msg))); 2885 if (!cm_id_priv) 2886 return -EINVAL; 2887 2888 work->cm_event.private_data = 2889 IBA_GET_MEM_PTR(CM_DREP_PRIVATE_DATA, drep_msg); 2890 2891 spin_lock_irq(&cm_id_priv->lock); 2892 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2893 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2894 spin_unlock_irq(&cm_id_priv->lock); 2895 goto out; 2896 } 2897 cm_enter_timewait(cm_id_priv); 2898 2899 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2900 cm_queue_work_unlock(cm_id_priv, work); 2901 return 0; 2902 out: 2903 cm_deref_id(cm_id_priv); 2904 return -EINVAL; 2905 } 2906 2907 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv, 2908 enum ib_cm_rej_reason reason, void *ari, 2909 u8 ari_length, const void *private_data, 2910 u8 private_data_len) 2911 { 2912 enum ib_cm_state state = cm_id_priv->id.state; 2913 struct ib_mad_send_buf *msg; 2914 int ret; 2915 2916 lockdep_assert_held(&cm_id_priv->lock); 2917 2918 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2919 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2920 return -EINVAL; 2921 2922 switch (state) { 2923 case IB_CM_REQ_SENT: 2924 case IB_CM_MRA_REQ_RCVD: 2925 case IB_CM_REQ_RCVD: 2926 case IB_CM_MRA_REQ_SENT: 2927 case IB_CM_REP_RCVD: 2928 case IB_CM_MRA_REP_SENT: 2929 cm_reset_to_idle(cm_id_priv); 2930 ret = cm_alloc_msg(cm_id_priv, &msg); 2931 if (ret) 2932 return ret; 2933 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason, 2934 ari, ari_length, private_data, private_data_len, 2935 state); 2936 break; 2937 case IB_CM_REP_SENT: 2938 case IB_CM_MRA_REP_RCVD: 2939 cm_enter_timewait(cm_id_priv); 2940 ret = cm_alloc_msg(cm_id_priv, &msg); 2941 if (ret) 2942 return ret; 2943 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason, 2944 ari, ari_length, private_data, private_data_len, 2945 state); 2946 break; 2947 default: 2948 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__, 2949 be32_to_cpu(cm_id_priv->id.local_id), 2950 cm_id_priv->id.state); 2951 return -EINVAL; 2952 } 2953 2954 ret = ib_post_send_mad(msg, NULL); 2955 if (ret) { 2956 cm_free_msg(msg); 2957 return ret; 2958 } 2959 2960 return 0; 2961 } 2962 2963 int ib_send_cm_rej(struct ib_cm_id *cm_id, enum ib_cm_rej_reason reason, 2964 void *ari, u8 ari_length, const void *private_data, 2965 u8 private_data_len) 2966 { 2967 struct cm_id_private *cm_id_priv = 2968 container_of(cm_id, struct cm_id_private, id); 2969 unsigned long flags; 2970 int ret; 2971 2972 spin_lock_irqsave(&cm_id_priv->lock, flags); 2973 ret = cm_send_rej_locked(cm_id_priv, reason, ari, ari_length, 2974 private_data, private_data_len); 2975 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2976 return ret; 2977 } 2978 EXPORT_SYMBOL(ib_send_cm_rej); 2979 2980 static void cm_format_rej_event(struct cm_work *work) 2981 { 2982 struct cm_rej_msg *rej_msg; 2983 struct ib_cm_rej_event_param *param; 2984 2985 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2986 param = &work->cm_event.param.rej_rcvd; 2987 param->ari = IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg); 2988 param->ari_length = IBA_GET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg); 2989 param->reason = IBA_GET(CM_REJ_REASON, rej_msg); 2990 work->cm_event.private_data = 2991 IBA_GET_MEM_PTR(CM_REJ_PRIVATE_DATA, rej_msg); 2992 } 2993 2994 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2995 { 2996 struct cm_id_private *cm_id_priv; 2997 __be32 remote_id; 2998 2999 remote_id = cpu_to_be32(IBA_GET(CM_REJ_LOCAL_COMM_ID, rej_msg)); 3000 3001 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_TIMEOUT) { 3002 cm_id_priv = cm_find_remote_id( 3003 *((__be64 *)IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg)), 3004 remote_id); 3005 } else if (IBA_GET(CM_REJ_MESSAGE_REJECTED, rej_msg) == 3006 CM_MSG_RESPONSE_REQ) 3007 cm_id_priv = cm_acquire_id( 3008 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)), 3009 0); 3010 else 3011 cm_id_priv = cm_acquire_id( 3012 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)), 3013 remote_id); 3014 3015 return cm_id_priv; 3016 } 3017 3018 static int cm_rej_handler(struct cm_work *work) 3019 { 3020 struct cm_id_private *cm_id_priv; 3021 struct cm_rej_msg *rej_msg; 3022 3023 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 3024 cm_id_priv = cm_acquire_rejected_id(rej_msg); 3025 if (!cm_id_priv) 3026 return -EINVAL; 3027 3028 cm_format_rej_event(work); 3029 3030 spin_lock_irq(&cm_id_priv->lock); 3031 switch (cm_id_priv->id.state) { 3032 case IB_CM_REQ_SENT: 3033 case IB_CM_MRA_REQ_RCVD: 3034 case IB_CM_REP_SENT: 3035 case IB_CM_MRA_REP_RCVD: 3036 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3037 fallthrough; 3038 case IB_CM_REQ_RCVD: 3039 case IB_CM_MRA_REQ_SENT: 3040 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_STALE_CONN) 3041 cm_enter_timewait(cm_id_priv); 3042 else 3043 cm_reset_to_idle(cm_id_priv); 3044 break; 3045 case IB_CM_DREQ_SENT: 3046 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3047 fallthrough; 3048 case IB_CM_REP_RCVD: 3049 case IB_CM_MRA_REP_SENT: 3050 cm_enter_timewait(cm_id_priv); 3051 break; 3052 case IB_CM_ESTABLISHED: 3053 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT || 3054 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) { 3055 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT) 3056 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 3057 cm_id_priv->msg); 3058 cm_enter_timewait(cm_id_priv); 3059 break; 3060 } 3061 fallthrough; 3062 default: 3063 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n", 3064 __func__, be32_to_cpu(cm_id_priv->id.local_id), 3065 cm_id_priv->id.state); 3066 spin_unlock_irq(&cm_id_priv->lock); 3067 goto out; 3068 } 3069 3070 cm_queue_work_unlock(cm_id_priv, work); 3071 return 0; 3072 out: 3073 cm_deref_id(cm_id_priv); 3074 return -EINVAL; 3075 } 3076 3077 int ib_send_cm_mra(struct ib_cm_id *cm_id, 3078 u8 service_timeout, 3079 const void *private_data, 3080 u8 private_data_len) 3081 { 3082 struct cm_id_private *cm_id_priv; 3083 struct ib_mad_send_buf *msg; 3084 enum ib_cm_state cm_state; 3085 enum ib_cm_lap_state lap_state; 3086 enum cm_msg_response msg_response; 3087 void *data; 3088 unsigned long flags; 3089 int ret; 3090 3091 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 3092 return -EINVAL; 3093 3094 data = cm_copy_private_data(private_data, private_data_len); 3095 if (IS_ERR(data)) 3096 return PTR_ERR(data); 3097 3098 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3099 3100 spin_lock_irqsave(&cm_id_priv->lock, flags); 3101 switch(cm_id_priv->id.state) { 3102 case IB_CM_REQ_RCVD: 3103 cm_state = IB_CM_MRA_REQ_SENT; 3104 lap_state = cm_id->lap_state; 3105 msg_response = CM_MSG_RESPONSE_REQ; 3106 break; 3107 case IB_CM_REP_RCVD: 3108 cm_state = IB_CM_MRA_REP_SENT; 3109 lap_state = cm_id->lap_state; 3110 msg_response = CM_MSG_RESPONSE_REP; 3111 break; 3112 case IB_CM_ESTABLISHED: 3113 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 3114 cm_state = cm_id->state; 3115 lap_state = IB_CM_MRA_LAP_SENT; 3116 msg_response = CM_MSG_RESPONSE_OTHER; 3117 break; 3118 } 3119 fallthrough; 3120 default: 3121 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n", 3122 __func__, be32_to_cpu(cm_id_priv->id.local_id), 3123 cm_id_priv->id.state); 3124 ret = -EINVAL; 3125 goto error1; 3126 } 3127 3128 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 3129 ret = cm_alloc_msg(cm_id_priv, &msg); 3130 if (ret) 3131 goto error1; 3132 3133 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 3134 msg_response, service_timeout, 3135 private_data, private_data_len); 3136 ret = ib_post_send_mad(msg, NULL); 3137 if (ret) 3138 goto error2; 3139 } 3140 3141 cm_id->state = cm_state; 3142 cm_id->lap_state = lap_state; 3143 cm_id_priv->service_timeout = service_timeout; 3144 cm_set_private_data(cm_id_priv, data, private_data_len); 3145 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3146 return 0; 3147 3148 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3149 kfree(data); 3150 return ret; 3151 3152 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3153 kfree(data); 3154 cm_free_msg(msg); 3155 return ret; 3156 } 3157 EXPORT_SYMBOL(ib_send_cm_mra); 3158 3159 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 3160 { 3161 switch (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg)) { 3162 case CM_MSG_RESPONSE_REQ: 3163 return cm_acquire_id( 3164 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)), 3165 0); 3166 case CM_MSG_RESPONSE_REP: 3167 case CM_MSG_RESPONSE_OTHER: 3168 return cm_acquire_id( 3169 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)), 3170 cpu_to_be32(IBA_GET(CM_MRA_LOCAL_COMM_ID, mra_msg))); 3171 default: 3172 return NULL; 3173 } 3174 } 3175 3176 static int cm_mra_handler(struct cm_work *work) 3177 { 3178 struct cm_id_private *cm_id_priv; 3179 struct cm_mra_msg *mra_msg; 3180 int timeout; 3181 3182 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 3183 cm_id_priv = cm_acquire_mraed_id(mra_msg); 3184 if (!cm_id_priv) 3185 return -EINVAL; 3186 3187 work->cm_event.private_data = 3188 IBA_GET_MEM_PTR(CM_MRA_PRIVATE_DATA, mra_msg); 3189 work->cm_event.param.mra_rcvd.service_timeout = 3190 IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg); 3191 timeout = cm_convert_to_ms(IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg)) + 3192 cm_convert_to_ms(cm_id_priv->av.timeout); 3193 3194 spin_lock_irq(&cm_id_priv->lock); 3195 switch (cm_id_priv->id.state) { 3196 case IB_CM_REQ_SENT: 3197 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != 3198 CM_MSG_RESPONSE_REQ || 3199 ib_modify_mad(cm_id_priv->av.port->mad_agent, 3200 cm_id_priv->msg, timeout)) 3201 goto out; 3202 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 3203 break; 3204 case IB_CM_REP_SENT: 3205 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != 3206 CM_MSG_RESPONSE_REP || 3207 ib_modify_mad(cm_id_priv->av.port->mad_agent, 3208 cm_id_priv->msg, timeout)) 3209 goto out; 3210 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 3211 break; 3212 case IB_CM_ESTABLISHED: 3213 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != 3214 CM_MSG_RESPONSE_OTHER || 3215 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 3216 ib_modify_mad(cm_id_priv->av.port->mad_agent, 3217 cm_id_priv->msg, timeout)) { 3218 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 3219 atomic_long_inc(&work->port-> 3220 counter_group[CM_RECV_DUPLICATES]. 3221 counter[CM_MRA_COUNTER]); 3222 goto out; 3223 } 3224 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 3225 break; 3226 case IB_CM_MRA_REQ_RCVD: 3227 case IB_CM_MRA_REP_RCVD: 3228 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3229 counter[CM_MRA_COUNTER]); 3230 fallthrough; 3231 default: 3232 pr_debug("%s local_id %d, cm_id_priv->id.state: %d\n", 3233 __func__, be32_to_cpu(cm_id_priv->id.local_id), 3234 cm_id_priv->id.state); 3235 goto out; 3236 } 3237 3238 cm_id_priv->msg->context[1] = (void *) (unsigned long) 3239 cm_id_priv->id.state; 3240 cm_queue_work_unlock(cm_id_priv, work); 3241 return 0; 3242 out: 3243 spin_unlock_irq(&cm_id_priv->lock); 3244 cm_deref_id(cm_id_priv); 3245 return -EINVAL; 3246 } 3247 3248 static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg, 3249 struct sa_path_rec *path) 3250 { 3251 u32 lid; 3252 3253 if (path->rec_type != SA_PATH_REC_TYPE_OPA) { 3254 sa_path_set_dlid(path, IBA_GET(CM_LAP_ALTERNATE_LOCAL_PORT_LID, 3255 lap_msg)); 3256 sa_path_set_slid(path, IBA_GET(CM_LAP_ALTERNATE_REMOTE_PORT_LID, 3257 lap_msg)); 3258 } else { 3259 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 3260 CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg)); 3261 sa_path_set_dlid(path, lid); 3262 3263 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 3264 CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg)); 3265 sa_path_set_slid(path, lid); 3266 } 3267 } 3268 3269 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 3270 struct sa_path_rec *path, 3271 struct cm_lap_msg *lap_msg) 3272 { 3273 path->dgid = *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg); 3274 path->sgid = 3275 *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg); 3276 path->flow_label = 3277 cpu_to_be32(IBA_GET(CM_LAP_ALTERNATE_FLOW_LABEL, lap_msg)); 3278 path->hop_limit = IBA_GET(CM_LAP_ALTERNATE_HOP_LIMIT, lap_msg); 3279 path->traffic_class = IBA_GET(CM_LAP_ALTERNATE_TRAFFIC_CLASS, lap_msg); 3280 path->reversible = 1; 3281 path->pkey = cm_id_priv->pkey; 3282 path->sl = IBA_GET(CM_LAP_ALTERNATE_SL, lap_msg); 3283 path->mtu_selector = IB_SA_EQ; 3284 path->mtu = cm_id_priv->path_mtu; 3285 path->rate_selector = IB_SA_EQ; 3286 path->rate = IBA_GET(CM_LAP_ALTERNATE_PACKET_RATE, lap_msg); 3287 path->packet_life_time_selector = IB_SA_EQ; 3288 path->packet_life_time = 3289 IBA_GET(CM_LAP_ALTERNATE_LOCAL_ACK_TIMEOUT, lap_msg); 3290 path->packet_life_time -= (path->packet_life_time > 0); 3291 cm_format_path_lid_from_lap(lap_msg, path); 3292 } 3293 3294 static int cm_lap_handler(struct cm_work *work) 3295 { 3296 struct cm_id_private *cm_id_priv; 3297 struct cm_lap_msg *lap_msg; 3298 struct ib_cm_lap_event_param *param; 3299 struct ib_mad_send_buf *msg = NULL; 3300 int ret; 3301 3302 /* Currently Alternate path messages are not supported for 3303 * RoCE link layer. 3304 */ 3305 if (rdma_protocol_roce(work->port->cm_dev->ib_device, 3306 work->port->port_num)) 3307 return -EINVAL; 3308 3309 /* todo: verify LAP request and send reject APR if invalid. */ 3310 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 3311 cm_id_priv = cm_acquire_id( 3312 cpu_to_be32(IBA_GET(CM_LAP_REMOTE_COMM_ID, lap_msg)), 3313 cpu_to_be32(IBA_GET(CM_LAP_LOCAL_COMM_ID, lap_msg))); 3314 if (!cm_id_priv) 3315 return -EINVAL; 3316 3317 param = &work->cm_event.param.lap_rcvd; 3318 memset(&work->path[0], 0, sizeof(work->path[1])); 3319 cm_path_set_rec_type(work->port->cm_dev->ib_device, 3320 work->port->port_num, &work->path[0], 3321 IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, 3322 lap_msg)); 3323 param->alternate_path = &work->path[0]; 3324 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 3325 work->cm_event.private_data = 3326 IBA_GET_MEM_PTR(CM_LAP_PRIVATE_DATA, lap_msg); 3327 3328 spin_lock_irq(&cm_id_priv->lock); 3329 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 3330 goto unlock; 3331 3332 switch (cm_id_priv->id.lap_state) { 3333 case IB_CM_LAP_UNINIT: 3334 case IB_CM_LAP_IDLE: 3335 break; 3336 case IB_CM_MRA_LAP_SENT: 3337 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3338 counter[CM_LAP_COUNTER]); 3339 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc); 3340 if (IS_ERR(msg)) 3341 goto unlock; 3342 3343 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 3344 CM_MSG_RESPONSE_OTHER, 3345 cm_id_priv->service_timeout, 3346 cm_id_priv->private_data, 3347 cm_id_priv->private_data_len); 3348 spin_unlock_irq(&cm_id_priv->lock); 3349 3350 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || 3351 ib_post_send_mad(msg, NULL)) 3352 cm_free_msg(msg); 3353 goto deref; 3354 case IB_CM_LAP_RCVD: 3355 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3356 counter[CM_LAP_COUNTER]); 3357 goto unlock; 3358 default: 3359 goto unlock; 3360 } 3361 3362 ret = cm_init_av_for_lap(work->port, work->mad_recv_wc->wc, 3363 work->mad_recv_wc->recv_buf.grh, 3364 &cm_id_priv->av); 3365 if (ret) 3366 goto unlock; 3367 3368 ret = cm_init_av_by_path(param->alternate_path, NULL, 3369 &cm_id_priv->alt_av, cm_id_priv); 3370 if (ret) 3371 goto unlock; 3372 3373 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 3374 cm_id_priv->tid = lap_msg->hdr.tid; 3375 cm_queue_work_unlock(cm_id_priv, work); 3376 return 0; 3377 3378 unlock: spin_unlock_irq(&cm_id_priv->lock); 3379 deref: cm_deref_id(cm_id_priv); 3380 return -EINVAL; 3381 } 3382 3383 static int cm_apr_handler(struct cm_work *work) 3384 { 3385 struct cm_id_private *cm_id_priv; 3386 struct cm_apr_msg *apr_msg; 3387 3388 /* Currently Alternate path messages are not supported for 3389 * RoCE link layer. 3390 */ 3391 if (rdma_protocol_roce(work->port->cm_dev->ib_device, 3392 work->port->port_num)) 3393 return -EINVAL; 3394 3395 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 3396 cm_id_priv = cm_acquire_id( 3397 cpu_to_be32(IBA_GET(CM_APR_REMOTE_COMM_ID, apr_msg)), 3398 cpu_to_be32(IBA_GET(CM_APR_LOCAL_COMM_ID, apr_msg))); 3399 if (!cm_id_priv) 3400 return -EINVAL; /* Unmatched reply. */ 3401 3402 work->cm_event.param.apr_rcvd.ap_status = 3403 IBA_GET(CM_APR_AR_STATUS, apr_msg); 3404 work->cm_event.param.apr_rcvd.apr_info = 3405 IBA_GET_MEM_PTR(CM_APR_ADDITIONAL_INFORMATION, apr_msg); 3406 work->cm_event.param.apr_rcvd.info_len = 3407 IBA_GET(CM_APR_ADDITIONAL_INFORMATION_LENGTH, apr_msg); 3408 work->cm_event.private_data = 3409 IBA_GET_MEM_PTR(CM_APR_PRIVATE_DATA, apr_msg); 3410 3411 spin_lock_irq(&cm_id_priv->lock); 3412 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 3413 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 3414 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 3415 spin_unlock_irq(&cm_id_priv->lock); 3416 goto out; 3417 } 3418 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 3419 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3420 cm_id_priv->msg = NULL; 3421 cm_queue_work_unlock(cm_id_priv, work); 3422 return 0; 3423 out: 3424 cm_deref_id(cm_id_priv); 3425 return -EINVAL; 3426 } 3427 3428 static int cm_timewait_handler(struct cm_work *work) 3429 { 3430 struct cm_timewait_info *timewait_info; 3431 struct cm_id_private *cm_id_priv; 3432 3433 timewait_info = container_of(work, struct cm_timewait_info, work); 3434 spin_lock_irq(&cm.lock); 3435 list_del(&timewait_info->list); 3436 spin_unlock_irq(&cm.lock); 3437 3438 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 3439 timewait_info->work.remote_id); 3440 if (!cm_id_priv) 3441 return -EINVAL; 3442 3443 spin_lock_irq(&cm_id_priv->lock); 3444 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 3445 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 3446 spin_unlock_irq(&cm_id_priv->lock); 3447 goto out; 3448 } 3449 cm_id_priv->id.state = IB_CM_IDLE; 3450 cm_queue_work_unlock(cm_id_priv, work); 3451 return 0; 3452 out: 3453 cm_deref_id(cm_id_priv); 3454 return -EINVAL; 3455 } 3456 3457 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 3458 struct cm_id_private *cm_id_priv, 3459 struct ib_cm_sidr_req_param *param) 3460 { 3461 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 3462 cm_form_tid(cm_id_priv)); 3463 IBA_SET(CM_SIDR_REQ_REQUESTID, sidr_req_msg, 3464 be32_to_cpu(cm_id_priv->id.local_id)); 3465 IBA_SET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg, 3466 be16_to_cpu(param->path->pkey)); 3467 IBA_SET(CM_SIDR_REQ_SERVICEID, sidr_req_msg, 3468 be64_to_cpu(param->service_id)); 3469 3470 if (param->private_data && param->private_data_len) 3471 IBA_SET_MEM(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg, 3472 param->private_data, param->private_data_len); 3473 } 3474 3475 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 3476 struct ib_cm_sidr_req_param *param) 3477 { 3478 struct cm_id_private *cm_id_priv; 3479 struct ib_mad_send_buf *msg; 3480 unsigned long flags; 3481 int ret; 3482 3483 if (!param->path || (param->private_data && 3484 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 3485 return -EINVAL; 3486 3487 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3488 ret = cm_init_av_by_path(param->path, param->sgid_attr, 3489 &cm_id_priv->av, 3490 cm_id_priv); 3491 if (ret) 3492 goto out; 3493 3494 cm_id->service_id = param->service_id; 3495 cm_id->service_mask = ~cpu_to_be64(0); 3496 cm_id_priv->timeout_ms = param->timeout_ms; 3497 cm_id_priv->max_cm_retries = param->max_cm_retries; 3498 ret = cm_alloc_msg(cm_id_priv, &msg); 3499 if (ret) 3500 goto out; 3501 3502 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 3503 param); 3504 msg->timeout_ms = cm_id_priv->timeout_ms; 3505 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 3506 3507 spin_lock_irqsave(&cm_id_priv->lock, flags); 3508 if (cm_id->state == IB_CM_IDLE) 3509 ret = ib_post_send_mad(msg, NULL); 3510 else 3511 ret = -EINVAL; 3512 3513 if (ret) { 3514 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3515 cm_free_msg(msg); 3516 goto out; 3517 } 3518 cm_id->state = IB_CM_SIDR_REQ_SENT; 3519 cm_id_priv->msg = msg; 3520 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3521 out: 3522 return ret; 3523 } 3524 EXPORT_SYMBOL(ib_send_cm_sidr_req); 3525 3526 static void cm_format_sidr_req_event(struct cm_work *work, 3527 const struct cm_id_private *rx_cm_id, 3528 struct ib_cm_id *listen_id) 3529 { 3530 struct cm_sidr_req_msg *sidr_req_msg; 3531 struct ib_cm_sidr_req_event_param *param; 3532 3533 sidr_req_msg = (struct cm_sidr_req_msg *) 3534 work->mad_recv_wc->recv_buf.mad; 3535 param = &work->cm_event.param.sidr_req_rcvd; 3536 param->pkey = IBA_GET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg); 3537 param->listen_id = listen_id; 3538 param->service_id = 3539 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg)); 3540 param->bth_pkey = cm_get_bth_pkey(work); 3541 param->port = work->port->port_num; 3542 param->sgid_attr = rx_cm_id->av.ah_attr.grh.sgid_attr; 3543 work->cm_event.private_data = 3544 IBA_GET_MEM_PTR(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg); 3545 } 3546 3547 static int cm_sidr_req_handler(struct cm_work *work) 3548 { 3549 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 3550 struct cm_sidr_req_msg *sidr_req_msg; 3551 struct ib_wc *wc; 3552 int ret; 3553 3554 cm_id_priv = 3555 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL); 3556 if (IS_ERR(cm_id_priv)) 3557 return PTR_ERR(cm_id_priv); 3558 3559 /* Record SGID/SLID and request ID for lookup. */ 3560 sidr_req_msg = (struct cm_sidr_req_msg *) 3561 work->mad_recv_wc->recv_buf.mad; 3562 3563 cm_id_priv->id.remote_id = 3564 cpu_to_be32(IBA_GET(CM_SIDR_REQ_REQUESTID, sidr_req_msg)); 3565 cm_id_priv->id.service_id = 3566 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg)); 3567 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 3568 cm_id_priv->tid = sidr_req_msg->hdr.tid; 3569 3570 wc = work->mad_recv_wc->wc; 3571 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 3572 cm_id_priv->av.dgid.global.interface_id = 0; 3573 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 3574 work->mad_recv_wc->recv_buf.grh, 3575 &cm_id_priv->av); 3576 if (ret) 3577 goto out; 3578 3579 spin_lock_irq(&cm.lock); 3580 listen_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 3581 if (listen_cm_id_priv) { 3582 spin_unlock_irq(&cm.lock); 3583 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3584 counter[CM_SIDR_REQ_COUNTER]); 3585 goto out; /* Duplicate message. */ 3586 } 3587 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3588 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 3589 cm_id_priv->id.service_id); 3590 if (!listen_cm_id_priv) { 3591 spin_unlock_irq(&cm.lock); 3592 ib_send_cm_sidr_rep(&cm_id_priv->id, 3593 &(struct ib_cm_sidr_rep_param){ 3594 .status = IB_SIDR_UNSUPPORTED }); 3595 goto out; /* No match. */ 3596 } 3597 spin_unlock_irq(&cm.lock); 3598 3599 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 3600 cm_id_priv->id.context = listen_cm_id_priv->id.context; 3601 3602 /* 3603 * A SIDR ID does not need to be in the xarray since it does not receive 3604 * mads, is not placed in the remote_id or remote_qpn rbtree, and does 3605 * not enter timewait. 3606 */ 3607 3608 cm_format_sidr_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 3609 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 3610 cm_free_work(work); 3611 /* 3612 * A pointer to the listen_cm_id is held in the event, so this deref 3613 * must be after the event is delivered above. 3614 */ 3615 cm_deref_id(listen_cm_id_priv); 3616 if (ret) 3617 cm_destroy_id(&cm_id_priv->id, ret); 3618 return 0; 3619 out: 3620 ib_destroy_cm_id(&cm_id_priv->id); 3621 return -EINVAL; 3622 } 3623 3624 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3625 struct cm_id_private *cm_id_priv, 3626 struct ib_cm_sidr_rep_param *param) 3627 { 3628 cm_format_mad_ece_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3629 cm_id_priv->tid, param->ece.attr_mod); 3630 IBA_SET(CM_SIDR_REP_REQUESTID, sidr_rep_msg, 3631 be32_to_cpu(cm_id_priv->id.remote_id)); 3632 IBA_SET(CM_SIDR_REP_STATUS, sidr_rep_msg, param->status); 3633 IBA_SET(CM_SIDR_REP_QPN, sidr_rep_msg, param->qp_num); 3634 IBA_SET(CM_SIDR_REP_SERVICEID, sidr_rep_msg, 3635 be64_to_cpu(cm_id_priv->id.service_id)); 3636 IBA_SET(CM_SIDR_REP_Q_KEY, sidr_rep_msg, param->qkey); 3637 IBA_SET(CM_SIDR_REP_VENDOR_ID_L, sidr_rep_msg, 3638 param->ece.vendor_id & 0xFF); 3639 IBA_SET(CM_SIDR_REP_VENDOR_ID_H, sidr_rep_msg, 3640 (param->ece.vendor_id >> 8) & 0xFF); 3641 3642 if (param->info && param->info_length) 3643 IBA_SET_MEM(CM_SIDR_REP_ADDITIONAL_INFORMATION, sidr_rep_msg, 3644 param->info, param->info_length); 3645 3646 if (param->private_data && param->private_data_len) 3647 IBA_SET_MEM(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg, 3648 param->private_data, param->private_data_len); 3649 } 3650 3651 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv, 3652 struct ib_cm_sidr_rep_param *param) 3653 { 3654 struct ib_mad_send_buf *msg; 3655 int ret; 3656 3657 lockdep_assert_held(&cm_id_priv->lock); 3658 3659 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3660 (param->private_data && 3661 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3662 return -EINVAL; 3663 3664 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_RCVD) 3665 return -EINVAL; 3666 3667 ret = cm_alloc_msg(cm_id_priv, &msg); 3668 if (ret) 3669 return ret; 3670 3671 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3672 param); 3673 ret = ib_post_send_mad(msg, NULL); 3674 if (ret) { 3675 cm_free_msg(msg); 3676 return ret; 3677 } 3678 cm_id_priv->id.state = IB_CM_IDLE; 3679 spin_lock_irq(&cm.lock); 3680 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) { 3681 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3682 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); 3683 } 3684 spin_unlock_irq(&cm.lock); 3685 return 0; 3686 } 3687 3688 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3689 struct ib_cm_sidr_rep_param *param) 3690 { 3691 struct cm_id_private *cm_id_priv = 3692 container_of(cm_id, struct cm_id_private, id); 3693 unsigned long flags; 3694 int ret; 3695 3696 spin_lock_irqsave(&cm_id_priv->lock, flags); 3697 ret = cm_send_sidr_rep_locked(cm_id_priv, param); 3698 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3699 return ret; 3700 } 3701 EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3702 3703 static void cm_format_sidr_rep_event(struct cm_work *work, 3704 const struct cm_id_private *cm_id_priv) 3705 { 3706 struct cm_sidr_rep_msg *sidr_rep_msg; 3707 struct ib_cm_sidr_rep_event_param *param; 3708 3709 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3710 work->mad_recv_wc->recv_buf.mad; 3711 param = &work->cm_event.param.sidr_rep_rcvd; 3712 param->status = IBA_GET(CM_SIDR_REP_STATUS, sidr_rep_msg); 3713 param->qkey = IBA_GET(CM_SIDR_REP_Q_KEY, sidr_rep_msg); 3714 param->qpn = IBA_GET(CM_SIDR_REP_QPN, sidr_rep_msg); 3715 param->info = IBA_GET_MEM_PTR(CM_SIDR_REP_ADDITIONAL_INFORMATION, 3716 sidr_rep_msg); 3717 param->info_len = IBA_GET(CM_SIDR_REP_ADDITIONAL_INFORMATION_LENGTH, 3718 sidr_rep_msg); 3719 param->sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr; 3720 work->cm_event.private_data = 3721 IBA_GET_MEM_PTR(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg); 3722 } 3723 3724 static int cm_sidr_rep_handler(struct cm_work *work) 3725 { 3726 struct cm_sidr_rep_msg *sidr_rep_msg; 3727 struct cm_id_private *cm_id_priv; 3728 3729 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3730 work->mad_recv_wc->recv_buf.mad; 3731 cm_id_priv = cm_acquire_id( 3732 cpu_to_be32(IBA_GET(CM_SIDR_REP_REQUESTID, sidr_rep_msg)), 0); 3733 if (!cm_id_priv) 3734 return -EINVAL; /* Unmatched reply. */ 3735 3736 spin_lock_irq(&cm_id_priv->lock); 3737 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3738 spin_unlock_irq(&cm_id_priv->lock); 3739 goto out; 3740 } 3741 cm_id_priv->id.state = IB_CM_IDLE; 3742 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3743 spin_unlock_irq(&cm_id_priv->lock); 3744 3745 cm_format_sidr_rep_event(work, cm_id_priv); 3746 cm_process_work(cm_id_priv, work); 3747 return 0; 3748 out: 3749 cm_deref_id(cm_id_priv); 3750 return -EINVAL; 3751 } 3752 3753 static void cm_process_send_error(struct ib_mad_send_buf *msg, 3754 enum ib_wc_status wc_status) 3755 { 3756 struct cm_id_private *cm_id_priv; 3757 struct ib_cm_event cm_event; 3758 enum ib_cm_state state; 3759 int ret; 3760 3761 memset(&cm_event, 0, sizeof cm_event); 3762 cm_id_priv = msg->context[0]; 3763 3764 /* Discard old sends or ones without a response. */ 3765 spin_lock_irq(&cm_id_priv->lock); 3766 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3767 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3768 goto discard; 3769 3770 pr_debug_ratelimited("CM: failed sending MAD in state %d. (%s)\n", 3771 state, ib_wc_status_msg(wc_status)); 3772 switch (state) { 3773 case IB_CM_REQ_SENT: 3774 case IB_CM_MRA_REQ_RCVD: 3775 cm_reset_to_idle(cm_id_priv); 3776 cm_event.event = IB_CM_REQ_ERROR; 3777 break; 3778 case IB_CM_REP_SENT: 3779 case IB_CM_MRA_REP_RCVD: 3780 cm_reset_to_idle(cm_id_priv); 3781 cm_event.event = IB_CM_REP_ERROR; 3782 break; 3783 case IB_CM_DREQ_SENT: 3784 cm_enter_timewait(cm_id_priv); 3785 cm_event.event = IB_CM_DREQ_ERROR; 3786 break; 3787 case IB_CM_SIDR_REQ_SENT: 3788 cm_id_priv->id.state = IB_CM_IDLE; 3789 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3790 break; 3791 default: 3792 goto discard; 3793 } 3794 spin_unlock_irq(&cm_id_priv->lock); 3795 cm_event.param.send_status = wc_status; 3796 3797 /* No other events can occur on the cm_id at this point. */ 3798 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3799 cm_free_msg(msg); 3800 if (ret) 3801 ib_destroy_cm_id(&cm_id_priv->id); 3802 return; 3803 discard: 3804 spin_unlock_irq(&cm_id_priv->lock); 3805 cm_free_msg(msg); 3806 } 3807 3808 static void cm_send_handler(struct ib_mad_agent *mad_agent, 3809 struct ib_mad_send_wc *mad_send_wc) 3810 { 3811 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3812 struct cm_port *port; 3813 u16 attr_index; 3814 3815 port = mad_agent->context; 3816 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3817 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3818 3819 /* 3820 * If the send was in response to a received message (context[0] is not 3821 * set to a cm_id), and is not a REJ, then it is a send that was 3822 * manually retried. 3823 */ 3824 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3825 msg->retries = 1; 3826 3827 atomic_long_add(1 + msg->retries, 3828 &port->counter_group[CM_XMIT].counter[attr_index]); 3829 if (msg->retries) 3830 atomic_long_add(msg->retries, 3831 &port->counter_group[CM_XMIT_RETRIES]. 3832 counter[attr_index]); 3833 3834 switch (mad_send_wc->status) { 3835 case IB_WC_SUCCESS: 3836 case IB_WC_WR_FLUSH_ERR: 3837 cm_free_msg(msg); 3838 break; 3839 default: 3840 if (msg->context[0] && msg->context[1]) 3841 cm_process_send_error(msg, mad_send_wc->status); 3842 else 3843 cm_free_msg(msg); 3844 break; 3845 } 3846 } 3847 3848 static void cm_work_handler(struct work_struct *_work) 3849 { 3850 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3851 int ret; 3852 3853 switch (work->cm_event.event) { 3854 case IB_CM_REQ_RECEIVED: 3855 ret = cm_req_handler(work); 3856 break; 3857 case IB_CM_MRA_RECEIVED: 3858 ret = cm_mra_handler(work); 3859 break; 3860 case IB_CM_REJ_RECEIVED: 3861 ret = cm_rej_handler(work); 3862 break; 3863 case IB_CM_REP_RECEIVED: 3864 ret = cm_rep_handler(work); 3865 break; 3866 case IB_CM_RTU_RECEIVED: 3867 ret = cm_rtu_handler(work); 3868 break; 3869 case IB_CM_USER_ESTABLISHED: 3870 ret = cm_establish_handler(work); 3871 break; 3872 case IB_CM_DREQ_RECEIVED: 3873 ret = cm_dreq_handler(work); 3874 break; 3875 case IB_CM_DREP_RECEIVED: 3876 ret = cm_drep_handler(work); 3877 break; 3878 case IB_CM_SIDR_REQ_RECEIVED: 3879 ret = cm_sidr_req_handler(work); 3880 break; 3881 case IB_CM_SIDR_REP_RECEIVED: 3882 ret = cm_sidr_rep_handler(work); 3883 break; 3884 case IB_CM_LAP_RECEIVED: 3885 ret = cm_lap_handler(work); 3886 break; 3887 case IB_CM_APR_RECEIVED: 3888 ret = cm_apr_handler(work); 3889 break; 3890 case IB_CM_TIMEWAIT_EXIT: 3891 ret = cm_timewait_handler(work); 3892 break; 3893 default: 3894 pr_debug("cm_event.event: 0x%x\n", work->cm_event.event); 3895 ret = -EINVAL; 3896 break; 3897 } 3898 if (ret) 3899 cm_free_work(work); 3900 } 3901 3902 static int cm_establish(struct ib_cm_id *cm_id) 3903 { 3904 struct cm_id_private *cm_id_priv; 3905 struct cm_work *work; 3906 unsigned long flags; 3907 int ret = 0; 3908 struct cm_device *cm_dev; 3909 3910 cm_dev = ib_get_client_data(cm_id->device, &cm_client); 3911 if (!cm_dev) 3912 return -ENODEV; 3913 3914 work = kmalloc(sizeof *work, GFP_ATOMIC); 3915 if (!work) 3916 return -ENOMEM; 3917 3918 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3919 spin_lock_irqsave(&cm_id_priv->lock, flags); 3920 switch (cm_id->state) 3921 { 3922 case IB_CM_REP_SENT: 3923 case IB_CM_MRA_REP_RCVD: 3924 cm_id->state = IB_CM_ESTABLISHED; 3925 break; 3926 case IB_CM_ESTABLISHED: 3927 ret = -EISCONN; 3928 break; 3929 default: 3930 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__, 3931 be32_to_cpu(cm_id->local_id), cm_id->state); 3932 ret = -EINVAL; 3933 break; 3934 } 3935 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3936 3937 if (ret) { 3938 kfree(work); 3939 goto out; 3940 } 3941 3942 /* 3943 * The CM worker thread may try to destroy the cm_id before it 3944 * can execute this work item. To prevent potential deadlock, 3945 * we need to find the cm_id once we're in the context of the 3946 * worker thread, rather than holding a reference on it. 3947 */ 3948 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3949 work->local_id = cm_id->local_id; 3950 work->remote_id = cm_id->remote_id; 3951 work->mad_recv_wc = NULL; 3952 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3953 3954 /* Check if the device started its remove_one */ 3955 spin_lock_irqsave(&cm.lock, flags); 3956 if (!cm_dev->going_down) { 3957 queue_delayed_work(cm.wq, &work->work, 0); 3958 } else { 3959 kfree(work); 3960 ret = -ENODEV; 3961 } 3962 spin_unlock_irqrestore(&cm.lock, flags); 3963 3964 out: 3965 return ret; 3966 } 3967 3968 static int cm_migrate(struct ib_cm_id *cm_id) 3969 { 3970 struct cm_id_private *cm_id_priv; 3971 struct cm_av tmp_av; 3972 unsigned long flags; 3973 int tmp_send_port_not_ready; 3974 int ret = 0; 3975 3976 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3977 spin_lock_irqsave(&cm_id_priv->lock, flags); 3978 if (cm_id->state == IB_CM_ESTABLISHED && 3979 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3980 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3981 cm_id->lap_state = IB_CM_LAP_IDLE; 3982 /* Swap address vector */ 3983 tmp_av = cm_id_priv->av; 3984 cm_id_priv->av = cm_id_priv->alt_av; 3985 cm_id_priv->alt_av = tmp_av; 3986 /* Swap port send ready state */ 3987 tmp_send_port_not_ready = cm_id_priv->prim_send_port_not_ready; 3988 cm_id_priv->prim_send_port_not_ready = cm_id_priv->altr_send_port_not_ready; 3989 cm_id_priv->altr_send_port_not_ready = tmp_send_port_not_ready; 3990 } else 3991 ret = -EINVAL; 3992 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3993 3994 return ret; 3995 } 3996 3997 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3998 { 3999 int ret; 4000 4001 switch (event) { 4002 case IB_EVENT_COMM_EST: 4003 ret = cm_establish(cm_id); 4004 break; 4005 case IB_EVENT_PATH_MIG: 4006 ret = cm_migrate(cm_id); 4007 break; 4008 default: 4009 ret = -EINVAL; 4010 } 4011 return ret; 4012 } 4013 EXPORT_SYMBOL(ib_cm_notify); 4014 4015 static void cm_recv_handler(struct ib_mad_agent *mad_agent, 4016 struct ib_mad_send_buf *send_buf, 4017 struct ib_mad_recv_wc *mad_recv_wc) 4018 { 4019 struct cm_port *port = mad_agent->context; 4020 struct cm_work *work; 4021 enum ib_cm_event_type event; 4022 bool alt_path = false; 4023 u16 attr_id; 4024 int paths = 0; 4025 int going_down = 0; 4026 4027 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 4028 case CM_REQ_ATTR_ID: 4029 alt_path = cm_req_has_alt_path((struct cm_req_msg *) 4030 mad_recv_wc->recv_buf.mad); 4031 paths = 1 + (alt_path != 0); 4032 event = IB_CM_REQ_RECEIVED; 4033 break; 4034 case CM_MRA_ATTR_ID: 4035 event = IB_CM_MRA_RECEIVED; 4036 break; 4037 case CM_REJ_ATTR_ID: 4038 event = IB_CM_REJ_RECEIVED; 4039 break; 4040 case CM_REP_ATTR_ID: 4041 event = IB_CM_REP_RECEIVED; 4042 break; 4043 case CM_RTU_ATTR_ID: 4044 event = IB_CM_RTU_RECEIVED; 4045 break; 4046 case CM_DREQ_ATTR_ID: 4047 event = IB_CM_DREQ_RECEIVED; 4048 break; 4049 case CM_DREP_ATTR_ID: 4050 event = IB_CM_DREP_RECEIVED; 4051 break; 4052 case CM_SIDR_REQ_ATTR_ID: 4053 event = IB_CM_SIDR_REQ_RECEIVED; 4054 break; 4055 case CM_SIDR_REP_ATTR_ID: 4056 event = IB_CM_SIDR_REP_RECEIVED; 4057 break; 4058 case CM_LAP_ATTR_ID: 4059 paths = 1; 4060 event = IB_CM_LAP_RECEIVED; 4061 break; 4062 case CM_APR_ATTR_ID: 4063 event = IB_CM_APR_RECEIVED; 4064 break; 4065 default: 4066 ib_free_recv_mad(mad_recv_wc); 4067 return; 4068 } 4069 4070 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 4071 atomic_long_inc(&port->counter_group[CM_RECV]. 4072 counter[attr_id - CM_ATTR_ID_OFFSET]); 4073 4074 work = kmalloc(struct_size(work, path, paths), GFP_KERNEL); 4075 if (!work) { 4076 ib_free_recv_mad(mad_recv_wc); 4077 return; 4078 } 4079 4080 INIT_DELAYED_WORK(&work->work, cm_work_handler); 4081 work->cm_event.event = event; 4082 work->mad_recv_wc = mad_recv_wc; 4083 work->port = port; 4084 4085 /* Check if the device started its remove_one */ 4086 spin_lock_irq(&cm.lock); 4087 if (!port->cm_dev->going_down) 4088 queue_delayed_work(cm.wq, &work->work, 0); 4089 else 4090 going_down = 1; 4091 spin_unlock_irq(&cm.lock); 4092 4093 if (going_down) { 4094 kfree(work); 4095 ib_free_recv_mad(mad_recv_wc); 4096 } 4097 } 4098 4099 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 4100 struct ib_qp_attr *qp_attr, 4101 int *qp_attr_mask) 4102 { 4103 unsigned long flags; 4104 int ret; 4105 4106 spin_lock_irqsave(&cm_id_priv->lock, flags); 4107 switch (cm_id_priv->id.state) { 4108 case IB_CM_REQ_SENT: 4109 case IB_CM_MRA_REQ_RCVD: 4110 case IB_CM_REQ_RCVD: 4111 case IB_CM_MRA_REQ_SENT: 4112 case IB_CM_REP_RCVD: 4113 case IB_CM_MRA_REP_SENT: 4114 case IB_CM_REP_SENT: 4115 case IB_CM_MRA_REP_RCVD: 4116 case IB_CM_ESTABLISHED: 4117 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 4118 IB_QP_PKEY_INDEX | IB_QP_PORT; 4119 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 4120 if (cm_id_priv->responder_resources) 4121 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 4122 IB_ACCESS_REMOTE_ATOMIC; 4123 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 4124 qp_attr->port_num = cm_id_priv->av.port->port_num; 4125 ret = 0; 4126 break; 4127 default: 4128 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n", 4129 __func__, be32_to_cpu(cm_id_priv->id.local_id), 4130 cm_id_priv->id.state); 4131 ret = -EINVAL; 4132 break; 4133 } 4134 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4135 return ret; 4136 } 4137 4138 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 4139 struct ib_qp_attr *qp_attr, 4140 int *qp_attr_mask) 4141 { 4142 unsigned long flags; 4143 int ret; 4144 4145 spin_lock_irqsave(&cm_id_priv->lock, flags); 4146 switch (cm_id_priv->id.state) { 4147 case IB_CM_REQ_RCVD: 4148 case IB_CM_MRA_REQ_SENT: 4149 case IB_CM_REP_RCVD: 4150 case IB_CM_MRA_REP_SENT: 4151 case IB_CM_REP_SENT: 4152 case IB_CM_MRA_REP_RCVD: 4153 case IB_CM_ESTABLISHED: 4154 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 4155 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 4156 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 4157 qp_attr->path_mtu = cm_id_priv->path_mtu; 4158 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 4159 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 4160 if (cm_id_priv->qp_type == IB_QPT_RC || 4161 cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 4162 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 4163 IB_QP_MIN_RNR_TIMER; 4164 qp_attr->max_dest_rd_atomic = 4165 cm_id_priv->responder_resources; 4166 qp_attr->min_rnr_timer = 0; 4167 } 4168 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) { 4169 *qp_attr_mask |= IB_QP_ALT_PATH; 4170 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 4171 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 4172 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 4173 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 4174 } 4175 ret = 0; 4176 break; 4177 default: 4178 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n", 4179 __func__, be32_to_cpu(cm_id_priv->id.local_id), 4180 cm_id_priv->id.state); 4181 ret = -EINVAL; 4182 break; 4183 } 4184 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4185 return ret; 4186 } 4187 4188 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 4189 struct ib_qp_attr *qp_attr, 4190 int *qp_attr_mask) 4191 { 4192 unsigned long flags; 4193 int ret; 4194 4195 spin_lock_irqsave(&cm_id_priv->lock, flags); 4196 switch (cm_id_priv->id.state) { 4197 /* Allow transition to RTS before sending REP */ 4198 case IB_CM_REQ_RCVD: 4199 case IB_CM_MRA_REQ_SENT: 4200 4201 case IB_CM_REP_RCVD: 4202 case IB_CM_MRA_REP_SENT: 4203 case IB_CM_REP_SENT: 4204 case IB_CM_MRA_REP_RCVD: 4205 case IB_CM_ESTABLISHED: 4206 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 4207 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 4208 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 4209 switch (cm_id_priv->qp_type) { 4210 case IB_QPT_RC: 4211 case IB_QPT_XRC_INI: 4212 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY | 4213 IB_QP_MAX_QP_RD_ATOMIC; 4214 qp_attr->retry_cnt = cm_id_priv->retry_count; 4215 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 4216 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 4217 fallthrough; 4218 case IB_QPT_XRC_TGT: 4219 *qp_attr_mask |= IB_QP_TIMEOUT; 4220 qp_attr->timeout = cm_id_priv->av.timeout; 4221 break; 4222 default: 4223 break; 4224 } 4225 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) { 4226 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 4227 qp_attr->path_mig_state = IB_MIG_REARM; 4228 } 4229 } else { 4230 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 4231 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 4232 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 4233 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 4234 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 4235 qp_attr->path_mig_state = IB_MIG_REARM; 4236 } 4237 ret = 0; 4238 break; 4239 default: 4240 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n", 4241 __func__, be32_to_cpu(cm_id_priv->id.local_id), 4242 cm_id_priv->id.state); 4243 ret = -EINVAL; 4244 break; 4245 } 4246 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4247 return ret; 4248 } 4249 4250 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 4251 struct ib_qp_attr *qp_attr, 4252 int *qp_attr_mask) 4253 { 4254 struct cm_id_private *cm_id_priv; 4255 int ret; 4256 4257 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 4258 switch (qp_attr->qp_state) { 4259 case IB_QPS_INIT: 4260 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 4261 break; 4262 case IB_QPS_RTR: 4263 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 4264 break; 4265 case IB_QPS_RTS: 4266 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 4267 break; 4268 default: 4269 ret = -EINVAL; 4270 break; 4271 } 4272 return ret; 4273 } 4274 EXPORT_SYMBOL(ib_cm_init_qp_attr); 4275 4276 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 4277 char *buf) 4278 { 4279 struct cm_counter_group *group; 4280 struct cm_counter_attribute *cm_attr; 4281 4282 group = container_of(obj, struct cm_counter_group, obj); 4283 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 4284 4285 return sprintf(buf, "%ld\n", 4286 atomic_long_read(&group->counter[cm_attr->index])); 4287 } 4288 4289 static const struct sysfs_ops cm_counter_ops = { 4290 .show = cm_show_counter 4291 }; 4292 4293 static struct kobj_type cm_counter_obj_type = { 4294 .sysfs_ops = &cm_counter_ops, 4295 .default_attrs = cm_counter_default_attrs 4296 }; 4297 4298 static char *cm_devnode(struct device *dev, umode_t *mode) 4299 { 4300 if (mode) 4301 *mode = 0666; 4302 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 4303 } 4304 4305 struct class cm_class = { 4306 .owner = THIS_MODULE, 4307 .name = "infiniband_cm", 4308 .devnode = cm_devnode, 4309 }; 4310 EXPORT_SYMBOL(cm_class); 4311 4312 static int cm_create_port_fs(struct cm_port *port) 4313 { 4314 int i, ret; 4315 4316 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 4317 ret = ib_port_register_module_stat(port->cm_dev->ib_device, 4318 port->port_num, 4319 &port->counter_group[i].obj, 4320 &cm_counter_obj_type, 4321 counter_group_names[i]); 4322 if (ret) 4323 goto error; 4324 } 4325 4326 return 0; 4327 4328 error: 4329 while (i--) 4330 ib_port_unregister_module_stat(&port->counter_group[i].obj); 4331 return ret; 4332 4333 } 4334 4335 static void cm_remove_port_fs(struct cm_port *port) 4336 { 4337 int i; 4338 4339 for (i = 0; i < CM_COUNTER_GROUPS; i++) 4340 ib_port_unregister_module_stat(&port->counter_group[i].obj); 4341 4342 } 4343 4344 static int cm_add_one(struct ib_device *ib_device) 4345 { 4346 struct cm_device *cm_dev; 4347 struct cm_port *port; 4348 struct ib_mad_reg_req reg_req = { 4349 .mgmt_class = IB_MGMT_CLASS_CM, 4350 .mgmt_class_version = IB_CM_CLASS_VERSION, 4351 }; 4352 struct ib_port_modify port_modify = { 4353 .set_port_cap_mask = IB_PORT_CM_SUP 4354 }; 4355 unsigned long flags; 4356 int ret; 4357 int count = 0; 4358 u8 i; 4359 4360 cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt), 4361 GFP_KERNEL); 4362 if (!cm_dev) 4363 return -ENOMEM; 4364 4365 cm_dev->ib_device = ib_device; 4366 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay; 4367 cm_dev->going_down = 0; 4368 4369 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 4370 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 4371 if (!rdma_cap_ib_cm(ib_device, i)) 4372 continue; 4373 4374 port = kzalloc(sizeof *port, GFP_KERNEL); 4375 if (!port) { 4376 ret = -ENOMEM; 4377 goto error1; 4378 } 4379 4380 cm_dev->port[i-1] = port; 4381 port->cm_dev = cm_dev; 4382 port->port_num = i; 4383 4384 INIT_LIST_HEAD(&port->cm_priv_prim_list); 4385 INIT_LIST_HEAD(&port->cm_priv_altr_list); 4386 4387 ret = cm_create_port_fs(port); 4388 if (ret) 4389 goto error1; 4390 4391 port->mad_agent = ib_register_mad_agent(ib_device, i, 4392 IB_QPT_GSI, 4393 ®_req, 4394 0, 4395 cm_send_handler, 4396 cm_recv_handler, 4397 port, 4398 0); 4399 if (IS_ERR(port->mad_agent)) { 4400 ret = PTR_ERR(port->mad_agent); 4401 goto error2; 4402 } 4403 4404 ret = ib_modify_port(ib_device, i, 0, &port_modify); 4405 if (ret) 4406 goto error3; 4407 4408 count++; 4409 } 4410 4411 if (!count) { 4412 ret = -EOPNOTSUPP; 4413 goto free; 4414 } 4415 4416 ib_set_client_data(ib_device, &cm_client, cm_dev); 4417 4418 write_lock_irqsave(&cm.device_lock, flags); 4419 list_add_tail(&cm_dev->list, &cm.device_list); 4420 write_unlock_irqrestore(&cm.device_lock, flags); 4421 return 0; 4422 4423 error3: 4424 ib_unregister_mad_agent(port->mad_agent); 4425 error2: 4426 cm_remove_port_fs(port); 4427 error1: 4428 port_modify.set_port_cap_mask = 0; 4429 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 4430 kfree(port); 4431 while (--i) { 4432 if (!rdma_cap_ib_cm(ib_device, i)) 4433 continue; 4434 4435 port = cm_dev->port[i-1]; 4436 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4437 ib_unregister_mad_agent(port->mad_agent); 4438 cm_remove_port_fs(port); 4439 kfree(port); 4440 } 4441 free: 4442 kfree(cm_dev); 4443 return ret; 4444 } 4445 4446 static void cm_remove_one(struct ib_device *ib_device, void *client_data) 4447 { 4448 struct cm_device *cm_dev = client_data; 4449 struct cm_port *port; 4450 struct cm_id_private *cm_id_priv; 4451 struct ib_mad_agent *cur_mad_agent; 4452 struct ib_port_modify port_modify = { 4453 .clr_port_cap_mask = IB_PORT_CM_SUP 4454 }; 4455 unsigned long flags; 4456 int i; 4457 4458 write_lock_irqsave(&cm.device_lock, flags); 4459 list_del(&cm_dev->list); 4460 write_unlock_irqrestore(&cm.device_lock, flags); 4461 4462 spin_lock_irq(&cm.lock); 4463 cm_dev->going_down = 1; 4464 spin_unlock_irq(&cm.lock); 4465 4466 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 4467 if (!rdma_cap_ib_cm(ib_device, i)) 4468 continue; 4469 4470 port = cm_dev->port[i-1]; 4471 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4472 /* Mark all the cm_id's as not valid */ 4473 spin_lock_irq(&cm.lock); 4474 list_for_each_entry(cm_id_priv, &port->cm_priv_altr_list, altr_list) 4475 cm_id_priv->altr_send_port_not_ready = 1; 4476 list_for_each_entry(cm_id_priv, &port->cm_priv_prim_list, prim_list) 4477 cm_id_priv->prim_send_port_not_ready = 1; 4478 spin_unlock_irq(&cm.lock); 4479 /* 4480 * We flush the queue here after the going_down set, this 4481 * verify that no new works will be queued in the recv handler, 4482 * after that we can call the unregister_mad_agent 4483 */ 4484 flush_workqueue(cm.wq); 4485 spin_lock_irq(&cm.state_lock); 4486 cur_mad_agent = port->mad_agent; 4487 port->mad_agent = NULL; 4488 spin_unlock_irq(&cm.state_lock); 4489 ib_unregister_mad_agent(cur_mad_agent); 4490 cm_remove_port_fs(port); 4491 kfree(port); 4492 } 4493 4494 kfree(cm_dev); 4495 } 4496 4497 static int __init ib_cm_init(void) 4498 { 4499 int ret; 4500 4501 INIT_LIST_HEAD(&cm.device_list); 4502 rwlock_init(&cm.device_lock); 4503 spin_lock_init(&cm.lock); 4504 spin_lock_init(&cm.state_lock); 4505 cm.listen_service_table = RB_ROOT; 4506 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 4507 cm.remote_id_table = RB_ROOT; 4508 cm.remote_qp_table = RB_ROOT; 4509 cm.remote_sidr_table = RB_ROOT; 4510 xa_init_flags(&cm.local_id_table, XA_FLAGS_ALLOC | XA_FLAGS_LOCK_IRQ); 4511 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 4512 INIT_LIST_HEAD(&cm.timewait_list); 4513 4514 ret = class_register(&cm_class); 4515 if (ret) { 4516 ret = -ENOMEM; 4517 goto error1; 4518 } 4519 4520 cm.wq = alloc_workqueue("ib_cm", 0, 1); 4521 if (!cm.wq) { 4522 ret = -ENOMEM; 4523 goto error2; 4524 } 4525 4526 ret = ib_register_client(&cm_client); 4527 if (ret) 4528 goto error3; 4529 4530 return 0; 4531 error3: 4532 destroy_workqueue(cm.wq); 4533 error2: 4534 class_unregister(&cm_class); 4535 error1: 4536 return ret; 4537 } 4538 4539 static void __exit ib_cm_cleanup(void) 4540 { 4541 struct cm_timewait_info *timewait_info, *tmp; 4542 4543 spin_lock_irq(&cm.lock); 4544 list_for_each_entry(timewait_info, &cm.timewait_list, list) 4545 cancel_delayed_work(&timewait_info->work.work); 4546 spin_unlock_irq(&cm.lock); 4547 4548 ib_unregister_client(&cm_client); 4549 destroy_workqueue(cm.wq); 4550 4551 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 4552 list_del(&timewait_info->list); 4553 kfree(timewait_info); 4554 } 4555 4556 class_unregister(&cm_class); 4557 WARN_ON(!xa_empty(&cm.local_id_table)); 4558 } 4559 4560 module_init(ib_cm_init); 4561 module_exit(ib_cm_cleanup); 4562