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 { 922 bool immediate; 923 924 /* 925 * To deliver the event to the user callback we have the drop the 926 * spinlock, however, we need to ensure that the user callback is single 927 * threaded and receives events in the temporal order. If there are 928 * already events being processed then thread new events onto a list, 929 * the thread currently processing will pick them up. 930 */ 931 immediate = atomic_inc_and_test(&cm_id_priv->work_count); 932 if (!immediate) { 933 list_add_tail(&work->list, &cm_id_priv->work_list); 934 /* 935 * This routine always consumes incoming reference. Once queued 936 * to the work_list then a reference is held by the thread 937 * currently running cm_process_work() and this reference is not 938 * needed. 939 */ 940 cm_deref_id(cm_id_priv); 941 } 942 spin_unlock_irq(&cm_id_priv->lock); 943 944 if (immediate) 945 cm_process_work(cm_id_priv, work); 946 } 947 948 static inline int cm_convert_to_ms(int iba_time) 949 { 950 /* approximate conversion to ms from 4.096us x 2^iba_time */ 951 return 1 << max(iba_time - 8, 0); 952 } 953 954 /* 955 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 956 * Because of how ack_timeout is stored, adding one doubles the timeout. 957 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 958 * increment it (round up) only if the other is within 50%. 959 */ 960 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 961 { 962 int ack_timeout = packet_life_time + 1; 963 964 if (ack_timeout >= ca_ack_delay) 965 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 966 else 967 ack_timeout = ca_ack_delay + 968 (ack_timeout >= (ca_ack_delay - 1)); 969 970 return min(31, ack_timeout); 971 } 972 973 static void cm_remove_remote(struct cm_id_private *cm_id_priv) 974 { 975 struct cm_timewait_info *timewait_info = cm_id_priv->timewait_info; 976 977 if (timewait_info->inserted_remote_id) { 978 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 979 timewait_info->inserted_remote_id = 0; 980 } 981 982 if (timewait_info->inserted_remote_qp) { 983 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 984 timewait_info->inserted_remote_qp = 0; 985 } 986 } 987 988 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 989 { 990 struct cm_timewait_info *timewait_info; 991 992 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 993 if (!timewait_info) 994 return ERR_PTR(-ENOMEM); 995 996 timewait_info->work.local_id = local_id; 997 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 998 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 999 return timewait_info; 1000 } 1001 1002 static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 1003 { 1004 int wait_time; 1005 unsigned long flags; 1006 struct cm_device *cm_dev; 1007 1008 lockdep_assert_held(&cm_id_priv->lock); 1009 1010 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client); 1011 if (!cm_dev) 1012 return; 1013 1014 spin_lock_irqsave(&cm.lock, flags); 1015 cm_remove_remote(cm_id_priv); 1016 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 1017 spin_unlock_irqrestore(&cm.lock, flags); 1018 1019 /* 1020 * The cm_id could be destroyed by the user before we exit timewait. 1021 * To protect against this, we search for the cm_id after exiting 1022 * timewait before notifying the user that we've exited timewait. 1023 */ 1024 cm_id_priv->id.state = IB_CM_TIMEWAIT; 1025 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 1026 1027 /* Check if the device started its remove_one */ 1028 spin_lock_irqsave(&cm.lock, flags); 1029 if (!cm_dev->going_down) 1030 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 1031 msecs_to_jiffies(wait_time)); 1032 spin_unlock_irqrestore(&cm.lock, flags); 1033 1034 /* 1035 * The timewait_info is converted into a work and gets freed during 1036 * cm_free_work() in cm_timewait_handler(). 1037 */ 1038 BUILD_BUG_ON(offsetof(struct cm_timewait_info, work) != 0); 1039 cm_id_priv->timewait_info = NULL; 1040 } 1041 1042 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 1043 { 1044 unsigned long flags; 1045 1046 lockdep_assert_held(&cm_id_priv->lock); 1047 1048 cm_id_priv->id.state = IB_CM_IDLE; 1049 if (cm_id_priv->timewait_info) { 1050 spin_lock_irqsave(&cm.lock, flags); 1051 cm_remove_remote(cm_id_priv); 1052 spin_unlock_irqrestore(&cm.lock, flags); 1053 kfree(cm_id_priv->timewait_info); 1054 cm_id_priv->timewait_info = NULL; 1055 } 1056 } 1057 1058 static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 1059 { 1060 struct cm_id_private *cm_id_priv; 1061 struct cm_work *work; 1062 1063 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1064 spin_lock_irq(&cm_id_priv->lock); 1065 retest: 1066 switch (cm_id->state) { 1067 case IB_CM_LISTEN: 1068 spin_lock(&cm.lock); 1069 if (--cm_id_priv->listen_sharecount > 0) { 1070 /* The id is still shared. */ 1071 WARN_ON(refcount_read(&cm_id_priv->refcount) == 1); 1072 spin_unlock(&cm.lock); 1073 spin_unlock_irq(&cm_id_priv->lock); 1074 cm_deref_id(cm_id_priv); 1075 return; 1076 } 1077 cm_id->state = IB_CM_IDLE; 1078 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 1079 RB_CLEAR_NODE(&cm_id_priv->service_node); 1080 spin_unlock(&cm.lock); 1081 break; 1082 case IB_CM_SIDR_REQ_SENT: 1083 cm_id->state = IB_CM_IDLE; 1084 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1085 break; 1086 case IB_CM_SIDR_REQ_RCVD: 1087 cm_send_sidr_rep_locked(cm_id_priv, 1088 &(struct ib_cm_sidr_rep_param){ 1089 .status = IB_SIDR_REJECT }); 1090 /* cm_send_sidr_rep_locked will not move to IDLE if it fails */ 1091 cm_id->state = IB_CM_IDLE; 1092 break; 1093 case IB_CM_REQ_SENT: 1094 case IB_CM_MRA_REQ_RCVD: 1095 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1096 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_TIMEOUT, 1097 &cm_id_priv->id.device->node_guid, 1098 sizeof(cm_id_priv->id.device->node_guid), 1099 NULL, 0); 1100 break; 1101 case IB_CM_REQ_RCVD: 1102 if (err == -ENOMEM) { 1103 /* Do not reject to allow future retries. */ 1104 cm_reset_to_idle(cm_id_priv); 1105 } else { 1106 cm_send_rej_locked(cm_id_priv, 1107 IB_CM_REJ_CONSUMER_DEFINED, NULL, 0, 1108 NULL, 0); 1109 } 1110 break; 1111 case IB_CM_REP_SENT: 1112 case IB_CM_MRA_REP_RCVD: 1113 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1114 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL, 1115 0, NULL, 0); 1116 goto retest; 1117 case IB_CM_MRA_REQ_SENT: 1118 case IB_CM_REP_RCVD: 1119 case IB_CM_MRA_REP_SENT: 1120 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL, 1121 0, NULL, 0); 1122 break; 1123 case IB_CM_ESTABLISHED: 1124 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 1125 cm_id->state = IB_CM_IDLE; 1126 break; 1127 } 1128 cm_send_dreq_locked(cm_id_priv, NULL, 0); 1129 goto retest; 1130 case IB_CM_DREQ_SENT: 1131 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1132 cm_enter_timewait(cm_id_priv); 1133 goto retest; 1134 case IB_CM_DREQ_RCVD: 1135 cm_send_drep_locked(cm_id_priv, NULL, 0); 1136 WARN_ON(cm_id->state != IB_CM_TIMEWAIT); 1137 goto retest; 1138 case IB_CM_TIMEWAIT: 1139 /* 1140 * The cm_acquire_id in cm_timewait_handler will stop working 1141 * once we do xa_erase below, so just move to idle here for 1142 * consistency. 1143 */ 1144 cm_id->state = IB_CM_IDLE; 1145 break; 1146 case IB_CM_IDLE: 1147 break; 1148 } 1149 WARN_ON(cm_id->state != IB_CM_IDLE); 1150 1151 spin_lock(&cm.lock); 1152 /* Required for cleanup paths related cm_req_handler() */ 1153 if (cm_id_priv->timewait_info) { 1154 cm_remove_remote(cm_id_priv); 1155 kfree(cm_id_priv->timewait_info); 1156 cm_id_priv->timewait_info = NULL; 1157 } 1158 if (!list_empty(&cm_id_priv->altr_list) && 1159 (!cm_id_priv->altr_send_port_not_ready)) 1160 list_del(&cm_id_priv->altr_list); 1161 if (!list_empty(&cm_id_priv->prim_list) && 1162 (!cm_id_priv->prim_send_port_not_ready)) 1163 list_del(&cm_id_priv->prim_list); 1164 WARN_ON(cm_id_priv->listen_sharecount); 1165 WARN_ON(!RB_EMPTY_NODE(&cm_id_priv->service_node)); 1166 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) 1167 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 1168 spin_unlock(&cm.lock); 1169 spin_unlock_irq(&cm_id_priv->lock); 1170 1171 xa_erase_irq(&cm.local_id_table, cm_local_id(cm_id->local_id)); 1172 cm_deref_id(cm_id_priv); 1173 wait_for_completion(&cm_id_priv->comp); 1174 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 1175 cm_free_work(work); 1176 1177 rdma_destroy_ah_attr(&cm_id_priv->av.ah_attr); 1178 rdma_destroy_ah_attr(&cm_id_priv->alt_av.ah_attr); 1179 kfree(cm_id_priv->private_data); 1180 kfree_rcu(cm_id_priv, rcu); 1181 } 1182 1183 void ib_destroy_cm_id(struct ib_cm_id *cm_id) 1184 { 1185 cm_destroy_id(cm_id, 0); 1186 } 1187 EXPORT_SYMBOL(ib_destroy_cm_id); 1188 1189 static int cm_init_listen(struct cm_id_private *cm_id_priv, __be64 service_id, 1190 __be64 service_mask) 1191 { 1192 service_mask = service_mask ? service_mask : ~cpu_to_be64(0); 1193 service_id &= service_mask; 1194 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 1195 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 1196 return -EINVAL; 1197 1198 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 1199 cm_id_priv->id.service_id = cpu_to_be64(cm.listen_service_id++); 1200 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 1201 } else { 1202 cm_id_priv->id.service_id = service_id; 1203 cm_id_priv->id.service_mask = service_mask; 1204 } 1205 return 0; 1206 } 1207 1208 /** 1209 * ib_cm_listen - Initiates listening on the specified service ID for 1210 * connection and service ID resolution requests. 1211 * @cm_id: Connection identifier associated with the listen request. 1212 * @service_id: Service identifier matched against incoming connection 1213 * and service ID resolution requests. The service ID should be specified 1214 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1215 * assign a service ID to the caller. 1216 * @service_mask: Mask applied to service ID used to listen across a 1217 * range of service IDs. If set to 0, the service ID is matched 1218 * exactly. This parameter is ignored if %service_id is set to 1219 * IB_CM_ASSIGN_SERVICE_ID. 1220 */ 1221 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask) 1222 { 1223 struct cm_id_private *cm_id_priv = 1224 container_of(cm_id, struct cm_id_private, id); 1225 unsigned long flags; 1226 int ret; 1227 1228 spin_lock_irqsave(&cm_id_priv->lock, flags); 1229 if (cm_id_priv->id.state != IB_CM_IDLE) { 1230 ret = -EINVAL; 1231 goto out; 1232 } 1233 1234 ret = cm_init_listen(cm_id_priv, service_id, service_mask); 1235 if (ret) 1236 goto out; 1237 1238 if (!cm_insert_listen(cm_id_priv, NULL)) { 1239 ret = -EBUSY; 1240 goto out; 1241 } 1242 1243 cm_id_priv->id.state = IB_CM_LISTEN; 1244 ret = 0; 1245 1246 out: 1247 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1248 return ret; 1249 } 1250 EXPORT_SYMBOL(ib_cm_listen); 1251 1252 /** 1253 * Create a new listening ib_cm_id and listen on the given service ID. 1254 * 1255 * If there's an existing ID listening on that same device and service ID, 1256 * return it. 1257 * 1258 * @device: Device associated with the cm_id. All related communication will 1259 * be associated with the specified device. 1260 * @cm_handler: Callback invoked to notify the user of CM events. 1261 * @service_id: Service identifier matched against incoming connection 1262 * and service ID resolution requests. The service ID should be specified 1263 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1264 * assign a service ID to the caller. 1265 * 1266 * Callers should call ib_destroy_cm_id when done with the listener ID. 1267 */ 1268 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device, 1269 ib_cm_handler cm_handler, 1270 __be64 service_id) 1271 { 1272 struct cm_id_private *listen_id_priv; 1273 struct cm_id_private *cm_id_priv; 1274 int err = 0; 1275 1276 /* Create an ID in advance, since the creation may sleep */ 1277 cm_id_priv = cm_alloc_id_priv(device, cm_handler, NULL); 1278 if (IS_ERR(cm_id_priv)) 1279 return ERR_CAST(cm_id_priv); 1280 1281 err = cm_init_listen(cm_id_priv, service_id, 0); 1282 if (err) 1283 return ERR_PTR(err); 1284 1285 spin_lock_irq(&cm_id_priv->lock); 1286 listen_id_priv = cm_insert_listen(cm_id_priv, cm_handler); 1287 if (listen_id_priv != cm_id_priv) { 1288 spin_unlock_irq(&cm_id_priv->lock); 1289 ib_destroy_cm_id(&cm_id_priv->id); 1290 if (!listen_id_priv) 1291 return ERR_PTR(-EINVAL); 1292 return &listen_id_priv->id; 1293 } 1294 cm_id_priv->id.state = IB_CM_LISTEN; 1295 spin_unlock_irq(&cm_id_priv->lock); 1296 1297 /* 1298 * A listen ID does not need to be in the xarray since it does not 1299 * receive mads, is not placed in the remote_id or remote_qpn rbtree, 1300 * and does not enter timewait. 1301 */ 1302 1303 return &cm_id_priv->id; 1304 } 1305 EXPORT_SYMBOL(ib_cm_insert_listen); 1306 1307 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv) 1308 { 1309 u64 hi_tid, low_tid; 1310 1311 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 1312 low_tid = (u64)cm_id_priv->id.local_id; 1313 return cpu_to_be64(hi_tid | low_tid); 1314 } 1315 1316 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 1317 __be16 attr_id, __be64 tid) 1318 { 1319 hdr->base_version = IB_MGMT_BASE_VERSION; 1320 hdr->mgmt_class = IB_MGMT_CLASS_CM; 1321 hdr->class_version = IB_CM_CLASS_VERSION; 1322 hdr->method = IB_MGMT_METHOD_SEND; 1323 hdr->attr_id = attr_id; 1324 hdr->tid = tid; 1325 } 1326 1327 static void cm_format_mad_ece_hdr(struct ib_mad_hdr *hdr, __be16 attr_id, 1328 __be64 tid, u32 attr_mod) 1329 { 1330 cm_format_mad_hdr(hdr, attr_id, tid); 1331 hdr->attr_mod = cpu_to_be32(attr_mod); 1332 } 1333 1334 static void cm_format_req(struct cm_req_msg *req_msg, 1335 struct cm_id_private *cm_id_priv, 1336 struct ib_cm_req_param *param) 1337 { 1338 struct sa_path_rec *pri_path = param->primary_path; 1339 struct sa_path_rec *alt_path = param->alternate_path; 1340 bool pri_ext = false; 1341 1342 if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA) 1343 pri_ext = opa_is_extended_lid(pri_path->opa.dlid, 1344 pri_path->opa.slid); 1345 1346 cm_format_mad_ece_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1347 cm_form_tid(cm_id_priv), param->ece.attr_mod); 1348 1349 IBA_SET(CM_REQ_LOCAL_COMM_ID, req_msg, 1350 be32_to_cpu(cm_id_priv->id.local_id)); 1351 IBA_SET(CM_REQ_SERVICE_ID, req_msg, be64_to_cpu(param->service_id)); 1352 IBA_SET(CM_REQ_LOCAL_CA_GUID, req_msg, 1353 be64_to_cpu(cm_id_priv->id.device->node_guid)); 1354 IBA_SET(CM_REQ_LOCAL_QPN, req_msg, param->qp_num); 1355 IBA_SET(CM_REQ_INITIATOR_DEPTH, req_msg, param->initiator_depth); 1356 IBA_SET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg, 1357 param->remote_cm_response_timeout); 1358 cm_req_set_qp_type(req_msg, param->qp_type); 1359 IBA_SET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg, param->flow_control); 1360 IBA_SET(CM_REQ_STARTING_PSN, req_msg, param->starting_psn); 1361 IBA_SET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg, 1362 param->local_cm_response_timeout); 1363 IBA_SET(CM_REQ_PARTITION_KEY, req_msg, 1364 be16_to_cpu(param->primary_path->pkey)); 1365 IBA_SET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg, 1366 param->primary_path->mtu); 1367 IBA_SET(CM_REQ_MAX_CM_RETRIES, req_msg, param->max_cm_retries); 1368 1369 if (param->qp_type != IB_QPT_XRC_INI) { 1370 IBA_SET(CM_REQ_RESPONDER_RESOURCES, req_msg, 1371 param->responder_resources); 1372 IBA_SET(CM_REQ_RETRY_COUNT, req_msg, param->retry_count); 1373 IBA_SET(CM_REQ_RNR_RETRY_COUNT, req_msg, 1374 param->rnr_retry_count); 1375 IBA_SET(CM_REQ_SRQ, req_msg, param->srq); 1376 } 1377 1378 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) = 1379 pri_path->sgid; 1380 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) = 1381 pri_path->dgid; 1382 if (pri_ext) { 1383 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) 1384 ->global.interface_id = 1385 OPA_MAKE_ID(be32_to_cpu(pri_path->opa.slid)); 1386 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) 1387 ->global.interface_id = 1388 OPA_MAKE_ID(be32_to_cpu(pri_path->opa.dlid)); 1389 } 1390 if (pri_path->hop_limit <= 1) { 1391 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 1392 be16_to_cpu(pri_ext ? 0 : 1393 htons(ntohl(sa_path_get_slid( 1394 pri_path))))); 1395 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, 1396 be16_to_cpu(pri_ext ? 0 : 1397 htons(ntohl(sa_path_get_dlid( 1398 pri_path))))); 1399 } else { 1400 /* Work-around until there's a way to obtain remote LID info */ 1401 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 1402 be16_to_cpu(IB_LID_PERMISSIVE)); 1403 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, 1404 be16_to_cpu(IB_LID_PERMISSIVE)); 1405 } 1406 IBA_SET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg, 1407 be32_to_cpu(pri_path->flow_label)); 1408 IBA_SET(CM_REQ_PRIMARY_PACKET_RATE, req_msg, pri_path->rate); 1409 IBA_SET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg, pri_path->traffic_class); 1410 IBA_SET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg, pri_path->hop_limit); 1411 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, pri_path->sl); 1412 IBA_SET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg, 1413 (pri_path->hop_limit <= 1)); 1414 IBA_SET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg, 1415 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1416 pri_path->packet_life_time)); 1417 1418 if (alt_path) { 1419 bool alt_ext = false; 1420 1421 if (alt_path->rec_type == SA_PATH_REC_TYPE_OPA) 1422 alt_ext = opa_is_extended_lid(alt_path->opa.dlid, 1423 alt_path->opa.slid); 1424 1425 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg) = 1426 alt_path->sgid; 1427 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg) = 1428 alt_path->dgid; 1429 if (alt_ext) { 1430 IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, 1431 req_msg) 1432 ->global.interface_id = 1433 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.slid)); 1434 IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, 1435 req_msg) 1436 ->global.interface_id = 1437 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.dlid)); 1438 } 1439 if (alt_path->hop_limit <= 1) { 1440 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, 1441 be16_to_cpu( 1442 alt_ext ? 0 : 1443 htons(ntohl(sa_path_get_slid( 1444 alt_path))))); 1445 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, 1446 be16_to_cpu( 1447 alt_ext ? 0 : 1448 htons(ntohl(sa_path_get_dlid( 1449 alt_path))))); 1450 } else { 1451 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, 1452 be16_to_cpu(IB_LID_PERMISSIVE)); 1453 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, 1454 be16_to_cpu(IB_LID_PERMISSIVE)); 1455 } 1456 IBA_SET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg, 1457 be32_to_cpu(alt_path->flow_label)); 1458 IBA_SET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg, alt_path->rate); 1459 IBA_SET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg, 1460 alt_path->traffic_class); 1461 IBA_SET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg, 1462 alt_path->hop_limit); 1463 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, alt_path->sl); 1464 IBA_SET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg, 1465 (alt_path->hop_limit <= 1)); 1466 IBA_SET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg, 1467 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1468 alt_path->packet_life_time)); 1469 } 1470 IBA_SET(CM_REQ_VENDOR_ID, req_msg, param->ece.vendor_id); 1471 1472 if (param->private_data && param->private_data_len) 1473 IBA_SET_MEM(CM_REQ_PRIVATE_DATA, req_msg, param->private_data, 1474 param->private_data_len); 1475 } 1476 1477 static int cm_validate_req_param(struct ib_cm_req_param *param) 1478 { 1479 if (!param->primary_path) 1480 return -EINVAL; 1481 1482 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC && 1483 param->qp_type != IB_QPT_XRC_INI) 1484 return -EINVAL; 1485 1486 if (param->private_data && 1487 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1488 return -EINVAL; 1489 1490 if (param->alternate_path && 1491 (param->alternate_path->pkey != param->primary_path->pkey || 1492 param->alternate_path->mtu != param->primary_path->mtu)) 1493 return -EINVAL; 1494 1495 return 0; 1496 } 1497 1498 int ib_send_cm_req(struct ib_cm_id *cm_id, 1499 struct ib_cm_req_param *param) 1500 { 1501 struct cm_id_private *cm_id_priv; 1502 struct cm_req_msg *req_msg; 1503 unsigned long flags; 1504 int ret; 1505 1506 ret = cm_validate_req_param(param); 1507 if (ret) 1508 return ret; 1509 1510 /* Verify that we're not in timewait. */ 1511 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1512 spin_lock_irqsave(&cm_id_priv->lock, flags); 1513 if (cm_id->state != IB_CM_IDLE || WARN_ON(cm_id_priv->timewait_info)) { 1514 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1515 ret = -EINVAL; 1516 goto out; 1517 } 1518 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1519 1520 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1521 id.local_id); 1522 if (IS_ERR(cm_id_priv->timewait_info)) { 1523 ret = PTR_ERR(cm_id_priv->timewait_info); 1524 goto out; 1525 } 1526 1527 ret = cm_init_av_by_path(param->primary_path, 1528 param->ppath_sgid_attr, &cm_id_priv->av, 1529 cm_id_priv); 1530 if (ret) 1531 goto out; 1532 if (param->alternate_path) { 1533 ret = cm_init_av_by_path(param->alternate_path, NULL, 1534 &cm_id_priv->alt_av, cm_id_priv); 1535 if (ret) 1536 goto out; 1537 } 1538 cm_id->service_id = param->service_id; 1539 cm_id->service_mask = ~cpu_to_be64(0); 1540 cm_id_priv->timeout_ms = cm_convert_to_ms( 1541 param->primary_path->packet_life_time) * 2 + 1542 cm_convert_to_ms( 1543 param->remote_cm_response_timeout); 1544 cm_id_priv->max_cm_retries = param->max_cm_retries; 1545 cm_id_priv->initiator_depth = param->initiator_depth; 1546 cm_id_priv->responder_resources = param->responder_resources; 1547 cm_id_priv->retry_count = param->retry_count; 1548 cm_id_priv->path_mtu = param->primary_path->mtu; 1549 cm_id_priv->pkey = param->primary_path->pkey; 1550 cm_id_priv->qp_type = param->qp_type; 1551 1552 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1553 if (ret) 1554 goto out; 1555 1556 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1557 cm_format_req(req_msg, cm_id_priv, param); 1558 cm_id_priv->tid = req_msg->hdr.tid; 1559 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1560 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1561 1562 cm_id_priv->local_qpn = cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg)); 1563 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg)); 1564 1565 spin_lock_irqsave(&cm_id_priv->lock, flags); 1566 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1567 if (ret) { 1568 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1569 goto error2; 1570 } 1571 BUG_ON(cm_id->state != IB_CM_IDLE); 1572 cm_id->state = IB_CM_REQ_SENT; 1573 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1574 return 0; 1575 1576 error2: cm_free_msg(cm_id_priv->msg); 1577 out: return ret; 1578 } 1579 EXPORT_SYMBOL(ib_send_cm_req); 1580 1581 static int cm_issue_rej(struct cm_port *port, 1582 struct ib_mad_recv_wc *mad_recv_wc, 1583 enum ib_cm_rej_reason reason, 1584 enum cm_msg_response msg_rejected, 1585 void *ari, u8 ari_length) 1586 { 1587 struct ib_mad_send_buf *msg = NULL; 1588 struct cm_rej_msg *rej_msg, *rcv_msg; 1589 int ret; 1590 1591 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1592 if (ret) 1593 return ret; 1594 1595 /* We just need common CM header information. Cast to any message. */ 1596 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1597 rej_msg = (struct cm_rej_msg *) msg->mad; 1598 1599 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1600 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg, 1601 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg)); 1602 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1603 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg)); 1604 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, msg_rejected); 1605 IBA_SET(CM_REJ_REASON, rej_msg, reason); 1606 1607 if (ari && ari_length) { 1608 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length); 1609 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length); 1610 } 1611 1612 ret = ib_post_send_mad(msg, NULL); 1613 if (ret) 1614 cm_free_msg(msg); 1615 1616 return ret; 1617 } 1618 1619 static bool cm_req_has_alt_path(struct cm_req_msg *req_msg) 1620 { 1621 return ((cpu_to_be16( 1622 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg))) || 1623 (ib_is_opa_gid(IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, 1624 req_msg)))); 1625 } 1626 1627 static void cm_path_set_rec_type(struct ib_device *ib_device, u8 port_num, 1628 struct sa_path_rec *path, union ib_gid *gid) 1629 { 1630 if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num)) 1631 path->rec_type = SA_PATH_REC_TYPE_OPA; 1632 else 1633 path->rec_type = SA_PATH_REC_TYPE_IB; 1634 } 1635 1636 static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg, 1637 struct sa_path_rec *primary_path, 1638 struct sa_path_rec *alt_path) 1639 { 1640 u32 lid; 1641 1642 if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) { 1643 sa_path_set_dlid(primary_path, 1644 IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID, 1645 req_msg)); 1646 sa_path_set_slid(primary_path, 1647 IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID, 1648 req_msg)); 1649 } else { 1650 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1651 CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg)); 1652 sa_path_set_dlid(primary_path, lid); 1653 1654 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1655 CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg)); 1656 sa_path_set_slid(primary_path, lid); 1657 } 1658 1659 if (!cm_req_has_alt_path(req_msg)) 1660 return; 1661 1662 if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) { 1663 sa_path_set_dlid(alt_path, 1664 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, 1665 req_msg)); 1666 sa_path_set_slid(alt_path, 1667 IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, 1668 req_msg)); 1669 } else { 1670 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1671 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg)); 1672 sa_path_set_dlid(alt_path, lid); 1673 1674 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 1675 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg)); 1676 sa_path_set_slid(alt_path, lid); 1677 } 1678 } 1679 1680 static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1681 struct sa_path_rec *primary_path, 1682 struct sa_path_rec *alt_path) 1683 { 1684 primary_path->dgid = 1685 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg); 1686 primary_path->sgid = 1687 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg); 1688 primary_path->flow_label = 1689 cpu_to_be32(IBA_GET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg)); 1690 primary_path->hop_limit = IBA_GET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg); 1691 primary_path->traffic_class = 1692 IBA_GET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg); 1693 primary_path->reversible = 1; 1694 primary_path->pkey = 1695 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 1696 primary_path->sl = IBA_GET(CM_REQ_PRIMARY_SL, req_msg); 1697 primary_path->mtu_selector = IB_SA_EQ; 1698 primary_path->mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 1699 primary_path->rate_selector = IB_SA_EQ; 1700 primary_path->rate = IBA_GET(CM_REQ_PRIMARY_PACKET_RATE, req_msg); 1701 primary_path->packet_life_time_selector = IB_SA_EQ; 1702 primary_path->packet_life_time = 1703 IBA_GET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg); 1704 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1705 primary_path->service_id = 1706 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 1707 if (sa_path_is_roce(primary_path)) 1708 primary_path->roce.route_resolved = false; 1709 1710 if (cm_req_has_alt_path(req_msg)) { 1711 alt_path->dgid = *IBA_GET_MEM_PTR( 1712 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg); 1713 alt_path->sgid = *IBA_GET_MEM_PTR( 1714 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg); 1715 alt_path->flow_label = cpu_to_be32( 1716 IBA_GET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg)); 1717 alt_path->hop_limit = 1718 IBA_GET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg); 1719 alt_path->traffic_class = 1720 IBA_GET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg); 1721 alt_path->reversible = 1; 1722 alt_path->pkey = 1723 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 1724 alt_path->sl = IBA_GET(CM_REQ_ALTERNATE_SL, req_msg); 1725 alt_path->mtu_selector = IB_SA_EQ; 1726 alt_path->mtu = 1727 IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 1728 alt_path->rate_selector = IB_SA_EQ; 1729 alt_path->rate = IBA_GET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg); 1730 alt_path->packet_life_time_selector = IB_SA_EQ; 1731 alt_path->packet_life_time = 1732 IBA_GET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg); 1733 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1734 alt_path->service_id = 1735 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 1736 1737 if (sa_path_is_roce(alt_path)) 1738 alt_path->roce.route_resolved = false; 1739 } 1740 cm_format_path_lid_from_req(req_msg, primary_path, alt_path); 1741 } 1742 1743 static u16 cm_get_bth_pkey(struct cm_work *work) 1744 { 1745 struct ib_device *ib_dev = work->port->cm_dev->ib_device; 1746 u8 port_num = work->port->port_num; 1747 u16 pkey_index = work->mad_recv_wc->wc->pkey_index; 1748 u16 pkey; 1749 int ret; 1750 1751 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey); 1752 if (ret) { 1753 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n", 1754 port_num, pkey_index, ret); 1755 return 0; 1756 } 1757 1758 return pkey; 1759 } 1760 1761 /** 1762 * Convert OPA SGID to IB SGID 1763 * ULPs (such as IPoIB) do not understand OPA GIDs and will 1764 * reject them as the local_gid will not match the sgid. Therefore, 1765 * change the pathrec's SGID to an IB SGID. 1766 * 1767 * @work: Work completion 1768 * @path: Path record 1769 */ 1770 static void cm_opa_to_ib_sgid(struct cm_work *work, 1771 struct sa_path_rec *path) 1772 { 1773 struct ib_device *dev = work->port->cm_dev->ib_device; 1774 u8 port_num = work->port->port_num; 1775 1776 if (rdma_cap_opa_ah(dev, port_num) && 1777 (ib_is_opa_gid(&path->sgid))) { 1778 union ib_gid sgid; 1779 1780 if (rdma_query_gid(dev, port_num, 0, &sgid)) { 1781 dev_warn(&dev->dev, 1782 "Error updating sgid in CM request\n"); 1783 return; 1784 } 1785 1786 path->sgid = sgid; 1787 } 1788 } 1789 1790 static void cm_format_req_event(struct cm_work *work, 1791 struct cm_id_private *cm_id_priv, 1792 struct ib_cm_id *listen_id) 1793 { 1794 struct cm_req_msg *req_msg; 1795 struct ib_cm_req_event_param *param; 1796 1797 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1798 param = &work->cm_event.param.req_rcvd; 1799 param->listen_id = listen_id; 1800 param->bth_pkey = cm_get_bth_pkey(work); 1801 param->port = cm_id_priv->av.port->port_num; 1802 param->primary_path = &work->path[0]; 1803 cm_opa_to_ib_sgid(work, param->primary_path); 1804 if (cm_req_has_alt_path(req_msg)) { 1805 param->alternate_path = &work->path[1]; 1806 cm_opa_to_ib_sgid(work, param->alternate_path); 1807 } else { 1808 param->alternate_path = NULL; 1809 } 1810 param->remote_ca_guid = 1811 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg)); 1812 param->remote_qkey = IBA_GET(CM_REQ_LOCAL_Q_KEY, req_msg); 1813 param->remote_qpn = IBA_GET(CM_REQ_LOCAL_QPN, req_msg); 1814 param->qp_type = cm_req_get_qp_type(req_msg); 1815 param->starting_psn = IBA_GET(CM_REQ_STARTING_PSN, req_msg); 1816 param->responder_resources = IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg); 1817 param->initiator_depth = IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg); 1818 param->local_cm_response_timeout = 1819 IBA_GET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg); 1820 param->flow_control = IBA_GET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg); 1821 param->remote_cm_response_timeout = 1822 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg); 1823 param->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg); 1824 param->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg); 1825 param->srq = IBA_GET(CM_REQ_SRQ, req_msg); 1826 param->ppath_sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr; 1827 param->ece.vendor_id = IBA_GET(CM_REQ_VENDOR_ID, req_msg); 1828 param->ece.attr_mod = be32_to_cpu(req_msg->hdr.attr_mod); 1829 1830 work->cm_event.private_data = 1831 IBA_GET_MEM_PTR(CM_REQ_PRIVATE_DATA, req_msg); 1832 } 1833 1834 static void cm_process_work(struct cm_id_private *cm_id_priv, 1835 struct cm_work *work) 1836 { 1837 int ret; 1838 1839 /* We will typically only have the current event to report. */ 1840 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1841 cm_free_work(work); 1842 1843 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1844 spin_lock_irq(&cm_id_priv->lock); 1845 work = cm_dequeue_work(cm_id_priv); 1846 spin_unlock_irq(&cm_id_priv->lock); 1847 if (!work) 1848 return; 1849 1850 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1851 &work->cm_event); 1852 cm_free_work(work); 1853 } 1854 cm_deref_id(cm_id_priv); 1855 if (ret) 1856 cm_destroy_id(&cm_id_priv->id, ret); 1857 } 1858 1859 static void cm_format_mra(struct cm_mra_msg *mra_msg, 1860 struct cm_id_private *cm_id_priv, 1861 enum cm_msg_response msg_mraed, u8 service_timeout, 1862 const void *private_data, u8 private_data_len) 1863 { 1864 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1865 IBA_SET(CM_MRA_MESSAGE_MRAED, mra_msg, msg_mraed); 1866 IBA_SET(CM_MRA_LOCAL_COMM_ID, mra_msg, 1867 be32_to_cpu(cm_id_priv->id.local_id)); 1868 IBA_SET(CM_MRA_REMOTE_COMM_ID, mra_msg, 1869 be32_to_cpu(cm_id_priv->id.remote_id)); 1870 IBA_SET(CM_MRA_SERVICE_TIMEOUT, mra_msg, service_timeout); 1871 1872 if (private_data && private_data_len) 1873 IBA_SET_MEM(CM_MRA_PRIVATE_DATA, mra_msg, private_data, 1874 private_data_len); 1875 } 1876 1877 static void cm_format_rej(struct cm_rej_msg *rej_msg, 1878 struct cm_id_private *cm_id_priv, 1879 enum ib_cm_rej_reason reason, void *ari, 1880 u8 ari_length, const void *private_data, 1881 u8 private_data_len, enum ib_cm_state state) 1882 { 1883 lockdep_assert_held(&cm_id_priv->lock); 1884 1885 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1886 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg, 1887 be32_to_cpu(cm_id_priv->id.remote_id)); 1888 1889 switch (state) { 1890 case IB_CM_REQ_RCVD: 1891 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, be32_to_cpu(0)); 1892 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ); 1893 break; 1894 case IB_CM_MRA_REQ_SENT: 1895 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1896 be32_to_cpu(cm_id_priv->id.local_id)); 1897 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ); 1898 break; 1899 case IB_CM_REP_RCVD: 1900 case IB_CM_MRA_REP_SENT: 1901 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1902 be32_to_cpu(cm_id_priv->id.local_id)); 1903 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REP); 1904 break; 1905 default: 1906 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, 1907 be32_to_cpu(cm_id_priv->id.local_id)); 1908 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, 1909 CM_MSG_RESPONSE_OTHER); 1910 break; 1911 } 1912 1913 IBA_SET(CM_REJ_REASON, rej_msg, reason); 1914 if (ari && ari_length) { 1915 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length); 1916 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length); 1917 } 1918 1919 if (private_data && private_data_len) 1920 IBA_SET_MEM(CM_REJ_PRIVATE_DATA, rej_msg, private_data, 1921 private_data_len); 1922 } 1923 1924 static void cm_dup_req_handler(struct cm_work *work, 1925 struct cm_id_private *cm_id_priv) 1926 { 1927 struct ib_mad_send_buf *msg = NULL; 1928 int ret; 1929 1930 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1931 counter[CM_REQ_COUNTER]); 1932 1933 /* Quick state check to discard duplicate REQs. */ 1934 spin_lock_irq(&cm_id_priv->lock); 1935 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) { 1936 spin_unlock_irq(&cm_id_priv->lock); 1937 return; 1938 } 1939 spin_unlock_irq(&cm_id_priv->lock); 1940 1941 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1942 if (ret) 1943 return; 1944 1945 spin_lock_irq(&cm_id_priv->lock); 1946 switch (cm_id_priv->id.state) { 1947 case IB_CM_MRA_REQ_SENT: 1948 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1949 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1950 cm_id_priv->private_data, 1951 cm_id_priv->private_data_len); 1952 break; 1953 case IB_CM_TIMEWAIT: 1954 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, 1955 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0, 1956 IB_CM_TIMEWAIT); 1957 break; 1958 default: 1959 goto unlock; 1960 } 1961 spin_unlock_irq(&cm_id_priv->lock); 1962 1963 ret = ib_post_send_mad(msg, NULL); 1964 if (ret) 1965 goto free; 1966 return; 1967 1968 unlock: spin_unlock_irq(&cm_id_priv->lock); 1969 free: cm_free_msg(msg); 1970 } 1971 1972 static struct cm_id_private * cm_match_req(struct cm_work *work, 1973 struct cm_id_private *cm_id_priv) 1974 { 1975 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1976 struct cm_timewait_info *timewait_info; 1977 struct cm_req_msg *req_msg; 1978 1979 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1980 1981 /* Check for possible duplicate REQ. */ 1982 spin_lock_irq(&cm.lock); 1983 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1984 if (timewait_info) { 1985 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 1986 timewait_info->work.remote_id); 1987 spin_unlock_irq(&cm.lock); 1988 if (cur_cm_id_priv) { 1989 cm_dup_req_handler(work, cur_cm_id_priv); 1990 cm_deref_id(cur_cm_id_priv); 1991 } 1992 return NULL; 1993 } 1994 1995 /* Check for stale connections. */ 1996 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1997 if (timewait_info) { 1998 cm_remove_remote(cm_id_priv); 1999 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2000 timewait_info->work.remote_id); 2001 2002 spin_unlock_irq(&cm.lock); 2003 cm_issue_rej(work->port, work->mad_recv_wc, 2004 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 2005 NULL, 0); 2006 if (cur_cm_id_priv) { 2007 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0); 2008 cm_deref_id(cur_cm_id_priv); 2009 } 2010 return NULL; 2011 } 2012 2013 /* Find matching listen request. */ 2014 listen_cm_id_priv = cm_find_listen( 2015 cm_id_priv->id.device, 2016 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg))); 2017 if (!listen_cm_id_priv) { 2018 cm_remove_remote(cm_id_priv); 2019 spin_unlock_irq(&cm.lock); 2020 cm_issue_rej(work->port, work->mad_recv_wc, 2021 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 2022 NULL, 0); 2023 return NULL; 2024 } 2025 spin_unlock_irq(&cm.lock); 2026 return listen_cm_id_priv; 2027 } 2028 2029 /* 2030 * Work-around for inter-subnet connections. If the LIDs are permissive, 2031 * we need to override the LID/SL data in the REQ with the LID information 2032 * in the work completion. 2033 */ 2034 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 2035 { 2036 if (!IBA_GET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg)) { 2037 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID, 2038 req_msg)) == IB_LID_PERMISSIVE) { 2039 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, 2040 be16_to_cpu(ib_lid_be16(wc->slid))); 2041 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, wc->sl); 2042 } 2043 2044 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID, 2045 req_msg)) == IB_LID_PERMISSIVE) 2046 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, 2047 wc->dlid_path_bits); 2048 } 2049 2050 if (!IBA_GET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg)) { 2051 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, 2052 req_msg)) == IB_LID_PERMISSIVE) { 2053 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, 2054 be16_to_cpu(ib_lid_be16(wc->slid))); 2055 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, wc->sl); 2056 } 2057 2058 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, 2059 req_msg)) == IB_LID_PERMISSIVE) 2060 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, 2061 wc->dlid_path_bits); 2062 } 2063 } 2064 2065 static int cm_req_handler(struct cm_work *work) 2066 { 2067 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 2068 struct cm_req_msg *req_msg; 2069 const struct ib_global_route *grh; 2070 const struct ib_gid_attr *gid_attr; 2071 int ret; 2072 2073 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 2074 2075 cm_id_priv = 2076 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL); 2077 if (IS_ERR(cm_id_priv)) 2078 return PTR_ERR(cm_id_priv); 2079 2080 cm_id_priv->id.remote_id = 2081 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_COMM_ID, req_msg)); 2082 cm_id_priv->id.service_id = 2083 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); 2084 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 2085 cm_id_priv->tid = req_msg->hdr.tid; 2086 cm_id_priv->timeout_ms = cm_convert_to_ms( 2087 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg)); 2088 cm_id_priv->max_cm_retries = IBA_GET(CM_REQ_MAX_CM_RETRIES, req_msg); 2089 cm_id_priv->remote_qpn = 2090 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg)); 2091 cm_id_priv->initiator_depth = 2092 IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg); 2093 cm_id_priv->responder_resources = 2094 IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg); 2095 cm_id_priv->path_mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); 2096 cm_id_priv->pkey = cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); 2097 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg)); 2098 cm_id_priv->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg); 2099 cm_id_priv->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg); 2100 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 2101 2102 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2103 work->mad_recv_wc->recv_buf.grh, 2104 &cm_id_priv->av); 2105 if (ret) 2106 goto destroy; 2107 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 2108 id.local_id); 2109 if (IS_ERR(cm_id_priv->timewait_info)) { 2110 ret = PTR_ERR(cm_id_priv->timewait_info); 2111 goto destroy; 2112 } 2113 cm_id_priv->timewait_info->work.remote_id = cm_id_priv->id.remote_id; 2114 cm_id_priv->timewait_info->remote_ca_guid = 2115 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg)); 2116 cm_id_priv->timewait_info->remote_qpn = cm_id_priv->remote_qpn; 2117 2118 /* 2119 * Note that the ID pointer is not in the xarray at this point, 2120 * so this set is only visible to the local thread. 2121 */ 2122 cm_id_priv->id.state = IB_CM_REQ_RCVD; 2123 2124 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 2125 if (!listen_cm_id_priv) { 2126 pr_debug("%s: local_id %d, no listen_cm_id_priv\n", __func__, 2127 be32_to_cpu(cm_id_priv->id.local_id)); 2128 cm_id_priv->id.state = IB_CM_IDLE; 2129 ret = -EINVAL; 2130 goto destroy; 2131 } 2132 2133 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 2134 2135 memset(&work->path[0], 0, sizeof(work->path[0])); 2136 if (cm_req_has_alt_path(req_msg)) 2137 memset(&work->path[1], 0, sizeof(work->path[1])); 2138 grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr); 2139 gid_attr = grh->sgid_attr; 2140 2141 if (gid_attr && 2142 rdma_protocol_roce(work->port->cm_dev->ib_device, 2143 work->port->port_num)) { 2144 work->path[0].rec_type = 2145 sa_conv_gid_to_pathrec_type(gid_attr->gid_type); 2146 } else { 2147 cm_path_set_rec_type( 2148 work->port->cm_dev->ib_device, work->port->port_num, 2149 &work->path[0], 2150 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, 2151 req_msg)); 2152 } 2153 if (cm_req_has_alt_path(req_msg)) 2154 work->path[1].rec_type = work->path[0].rec_type; 2155 cm_format_paths_from_req(req_msg, &work->path[0], 2156 &work->path[1]); 2157 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE) 2158 sa_path_set_dmac(&work->path[0], 2159 cm_id_priv->av.ah_attr.roce.dmac); 2160 work->path[0].hop_limit = grh->hop_limit; 2161 ret = cm_init_av_by_path(&work->path[0], gid_attr, &cm_id_priv->av, 2162 cm_id_priv); 2163 if (ret) { 2164 int err; 2165 2166 err = rdma_query_gid(work->port->cm_dev->ib_device, 2167 work->port->port_num, 0, 2168 &work->path[0].sgid); 2169 if (err) 2170 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID, 2171 NULL, 0, NULL, 0); 2172 else 2173 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID, 2174 &work->path[0].sgid, 2175 sizeof(work->path[0].sgid), 2176 NULL, 0); 2177 goto rejected; 2178 } 2179 if (cm_req_has_alt_path(req_msg)) { 2180 ret = cm_init_av_by_path(&work->path[1], NULL, 2181 &cm_id_priv->alt_av, cm_id_priv); 2182 if (ret) { 2183 ib_send_cm_rej(&cm_id_priv->id, 2184 IB_CM_REJ_INVALID_ALT_GID, 2185 &work->path[0].sgid, 2186 sizeof(work->path[0].sgid), NULL, 0); 2187 goto rejected; 2188 } 2189 } 2190 2191 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 2192 cm_id_priv->id.context = listen_cm_id_priv->id.context; 2193 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 2194 2195 /* Now MAD handlers can see the new ID */ 2196 spin_lock_irq(&cm_id_priv->lock); 2197 cm_finalize_id(cm_id_priv); 2198 2199 /* Refcount belongs to the event, pairs with cm_process_work() */ 2200 refcount_inc(&cm_id_priv->refcount); 2201 cm_queue_work_unlock(cm_id_priv, work); 2202 /* 2203 * Since this ID was just created and was not made visible to other MAD 2204 * handlers until the cm_finalize_id() above we know that the 2205 * cm_process_work() will deliver the event and the listen_cm_id 2206 * embedded in the event can be derefed here. 2207 */ 2208 cm_deref_id(listen_cm_id_priv); 2209 return 0; 2210 2211 rejected: 2212 cm_deref_id(listen_cm_id_priv); 2213 destroy: 2214 ib_destroy_cm_id(&cm_id_priv->id); 2215 return ret; 2216 } 2217 2218 static void cm_format_rep(struct cm_rep_msg *rep_msg, 2219 struct cm_id_private *cm_id_priv, 2220 struct ib_cm_rep_param *param) 2221 { 2222 cm_format_mad_ece_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid, 2223 param->ece.attr_mod); 2224 IBA_SET(CM_REP_LOCAL_COMM_ID, rep_msg, 2225 be32_to_cpu(cm_id_priv->id.local_id)); 2226 IBA_SET(CM_REP_REMOTE_COMM_ID, rep_msg, 2227 be32_to_cpu(cm_id_priv->id.remote_id)); 2228 IBA_SET(CM_REP_STARTING_PSN, rep_msg, param->starting_psn); 2229 IBA_SET(CM_REP_RESPONDER_RESOURCES, rep_msg, 2230 param->responder_resources); 2231 IBA_SET(CM_REP_TARGET_ACK_DELAY, rep_msg, 2232 cm_id_priv->av.port->cm_dev->ack_delay); 2233 IBA_SET(CM_REP_FAILOVER_ACCEPTED, rep_msg, param->failover_accepted); 2234 IBA_SET(CM_REP_RNR_RETRY_COUNT, rep_msg, param->rnr_retry_count); 2235 IBA_SET(CM_REP_LOCAL_CA_GUID, rep_msg, 2236 be64_to_cpu(cm_id_priv->id.device->node_guid)); 2237 2238 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) { 2239 IBA_SET(CM_REP_INITIATOR_DEPTH, rep_msg, 2240 param->initiator_depth); 2241 IBA_SET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg, 2242 param->flow_control); 2243 IBA_SET(CM_REP_SRQ, rep_msg, param->srq); 2244 IBA_SET(CM_REP_LOCAL_QPN, rep_msg, param->qp_num); 2245 } else { 2246 IBA_SET(CM_REP_SRQ, rep_msg, 1); 2247 IBA_SET(CM_REP_LOCAL_EE_CONTEXT_NUMBER, rep_msg, param->qp_num); 2248 } 2249 2250 IBA_SET(CM_REP_VENDOR_ID_L, rep_msg, param->ece.vendor_id); 2251 IBA_SET(CM_REP_VENDOR_ID_M, rep_msg, param->ece.vendor_id >> 8); 2252 IBA_SET(CM_REP_VENDOR_ID_H, rep_msg, param->ece.vendor_id >> 16); 2253 2254 if (param->private_data && param->private_data_len) 2255 IBA_SET_MEM(CM_REP_PRIVATE_DATA, rep_msg, param->private_data, 2256 param->private_data_len); 2257 } 2258 2259 int ib_send_cm_rep(struct ib_cm_id *cm_id, 2260 struct ib_cm_rep_param *param) 2261 { 2262 struct cm_id_private *cm_id_priv; 2263 struct ib_mad_send_buf *msg; 2264 struct cm_rep_msg *rep_msg; 2265 unsigned long flags; 2266 int ret; 2267 2268 if (param->private_data && 2269 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 2270 return -EINVAL; 2271 2272 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2273 spin_lock_irqsave(&cm_id_priv->lock, flags); 2274 if (cm_id->state != IB_CM_REQ_RCVD && 2275 cm_id->state != IB_CM_MRA_REQ_SENT) { 2276 pr_debug("%s: local_comm_id %d, cm_id->state: %d\n", __func__, 2277 be32_to_cpu(cm_id_priv->id.local_id), cm_id->state); 2278 ret = -EINVAL; 2279 goto out; 2280 } 2281 2282 ret = cm_alloc_msg(cm_id_priv, &msg); 2283 if (ret) 2284 goto out; 2285 2286 rep_msg = (struct cm_rep_msg *) msg->mad; 2287 cm_format_rep(rep_msg, cm_id_priv, param); 2288 msg->timeout_ms = cm_id_priv->timeout_ms; 2289 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 2290 2291 ret = ib_post_send_mad(msg, NULL); 2292 if (ret) { 2293 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2294 cm_free_msg(msg); 2295 return ret; 2296 } 2297 2298 cm_id->state = IB_CM_REP_SENT; 2299 cm_id_priv->msg = msg; 2300 cm_id_priv->initiator_depth = param->initiator_depth; 2301 cm_id_priv->responder_resources = param->responder_resources; 2302 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg)); 2303 WARN_ONCE(param->qp_num & 0xFF000000, 2304 "IBTA declares QPN to be 24 bits, but it is 0x%X\n", 2305 param->qp_num); 2306 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF); 2307 2308 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2309 return ret; 2310 } 2311 EXPORT_SYMBOL(ib_send_cm_rep); 2312 2313 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 2314 struct cm_id_private *cm_id_priv, 2315 const void *private_data, 2316 u8 private_data_len) 2317 { 2318 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 2319 IBA_SET(CM_RTU_LOCAL_COMM_ID, rtu_msg, 2320 be32_to_cpu(cm_id_priv->id.local_id)); 2321 IBA_SET(CM_RTU_REMOTE_COMM_ID, rtu_msg, 2322 be32_to_cpu(cm_id_priv->id.remote_id)); 2323 2324 if (private_data && private_data_len) 2325 IBA_SET_MEM(CM_RTU_PRIVATE_DATA, rtu_msg, private_data, 2326 private_data_len); 2327 } 2328 2329 int ib_send_cm_rtu(struct ib_cm_id *cm_id, 2330 const void *private_data, 2331 u8 private_data_len) 2332 { 2333 struct cm_id_private *cm_id_priv; 2334 struct ib_mad_send_buf *msg; 2335 unsigned long flags; 2336 void *data; 2337 int ret; 2338 2339 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 2340 return -EINVAL; 2341 2342 data = cm_copy_private_data(private_data, private_data_len); 2343 if (IS_ERR(data)) 2344 return PTR_ERR(data); 2345 2346 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2347 spin_lock_irqsave(&cm_id_priv->lock, flags); 2348 if (cm_id->state != IB_CM_REP_RCVD && 2349 cm_id->state != IB_CM_MRA_REP_SENT) { 2350 pr_debug("%s: local_id %d, cm_id->state %d\n", __func__, 2351 be32_to_cpu(cm_id->local_id), cm_id->state); 2352 ret = -EINVAL; 2353 goto error; 2354 } 2355 2356 ret = cm_alloc_msg(cm_id_priv, &msg); 2357 if (ret) 2358 goto error; 2359 2360 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 2361 private_data, private_data_len); 2362 2363 ret = ib_post_send_mad(msg, NULL); 2364 if (ret) { 2365 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2366 cm_free_msg(msg); 2367 kfree(data); 2368 return ret; 2369 } 2370 2371 cm_id->state = IB_CM_ESTABLISHED; 2372 cm_set_private_data(cm_id_priv, data, private_data_len); 2373 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2374 return 0; 2375 2376 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2377 kfree(data); 2378 return ret; 2379 } 2380 EXPORT_SYMBOL(ib_send_cm_rtu); 2381 2382 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type) 2383 { 2384 struct cm_rep_msg *rep_msg; 2385 struct ib_cm_rep_event_param *param; 2386 2387 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 2388 param = &work->cm_event.param.rep_rcvd; 2389 param->remote_ca_guid = 2390 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg)); 2391 param->remote_qkey = IBA_GET(CM_REP_LOCAL_Q_KEY, rep_msg); 2392 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type)); 2393 param->starting_psn = IBA_GET(CM_REP_STARTING_PSN, rep_msg); 2394 param->responder_resources = IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg); 2395 param->initiator_depth = IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg); 2396 param->target_ack_delay = IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg); 2397 param->failover_accepted = IBA_GET(CM_REP_FAILOVER_ACCEPTED, rep_msg); 2398 param->flow_control = IBA_GET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg); 2399 param->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg); 2400 param->srq = IBA_GET(CM_REP_SRQ, rep_msg); 2401 param->ece.vendor_id = IBA_GET(CM_REP_VENDOR_ID_H, rep_msg) << 16; 2402 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_M, rep_msg) << 8; 2403 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_L, rep_msg); 2404 param->ece.attr_mod = be32_to_cpu(rep_msg->hdr.attr_mod); 2405 2406 work->cm_event.private_data = 2407 IBA_GET_MEM_PTR(CM_REP_PRIVATE_DATA, rep_msg); 2408 } 2409 2410 static void cm_dup_rep_handler(struct cm_work *work) 2411 { 2412 struct cm_id_private *cm_id_priv; 2413 struct cm_rep_msg *rep_msg; 2414 struct ib_mad_send_buf *msg = NULL; 2415 int ret; 2416 2417 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 2418 cm_id_priv = cm_acquire_id( 2419 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 2420 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg))); 2421 if (!cm_id_priv) 2422 return; 2423 2424 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2425 counter[CM_REP_COUNTER]); 2426 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 2427 if (ret) 2428 goto deref; 2429 2430 spin_lock_irq(&cm_id_priv->lock); 2431 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 2432 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 2433 cm_id_priv->private_data, 2434 cm_id_priv->private_data_len); 2435 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 2436 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2437 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 2438 cm_id_priv->private_data, 2439 cm_id_priv->private_data_len); 2440 else 2441 goto unlock; 2442 spin_unlock_irq(&cm_id_priv->lock); 2443 2444 ret = ib_post_send_mad(msg, NULL); 2445 if (ret) 2446 goto free; 2447 goto deref; 2448 2449 unlock: spin_unlock_irq(&cm_id_priv->lock); 2450 free: cm_free_msg(msg); 2451 deref: cm_deref_id(cm_id_priv); 2452 } 2453 2454 static int cm_rep_handler(struct cm_work *work) 2455 { 2456 struct cm_id_private *cm_id_priv; 2457 struct cm_rep_msg *rep_msg; 2458 int ret; 2459 struct cm_id_private *cur_cm_id_priv; 2460 struct cm_timewait_info *timewait_info; 2461 2462 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 2463 cm_id_priv = cm_acquire_id( 2464 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 0); 2465 if (!cm_id_priv) { 2466 cm_dup_rep_handler(work); 2467 pr_debug("%s: remote_comm_id %d, no cm_id_priv\n", __func__, 2468 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2469 return -EINVAL; 2470 } 2471 2472 cm_format_rep_event(work, cm_id_priv->qp_type); 2473 2474 spin_lock_irq(&cm_id_priv->lock); 2475 switch (cm_id_priv->id.state) { 2476 case IB_CM_REQ_SENT: 2477 case IB_CM_MRA_REQ_RCVD: 2478 break; 2479 default: 2480 ret = -EINVAL; 2481 pr_debug( 2482 "%s: cm_id_priv->id.state: %d, local_comm_id %d, remote_comm_id %d\n", 2483 __func__, cm_id_priv->id.state, 2484 IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg), 2485 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2486 spin_unlock_irq(&cm_id_priv->lock); 2487 goto error; 2488 } 2489 2490 cm_id_priv->timewait_info->work.remote_id = 2491 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)); 2492 cm_id_priv->timewait_info->remote_ca_guid = 2493 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg)); 2494 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2495 2496 spin_lock(&cm.lock); 2497 /* Check for duplicate REP. */ 2498 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 2499 spin_unlock(&cm.lock); 2500 spin_unlock_irq(&cm_id_priv->lock); 2501 ret = -EINVAL; 2502 pr_debug("%s: Failed to insert remote id %d\n", __func__, 2503 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2504 goto error; 2505 } 2506 /* Check for a stale connection. */ 2507 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 2508 if (timewait_info) { 2509 cm_remove_remote(cm_id_priv); 2510 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2511 timewait_info->work.remote_id); 2512 2513 spin_unlock(&cm.lock); 2514 spin_unlock_irq(&cm_id_priv->lock); 2515 cm_issue_rej(work->port, work->mad_recv_wc, 2516 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 2517 NULL, 0); 2518 ret = -EINVAL; 2519 pr_debug( 2520 "%s: Stale connection. local_comm_id %d, remote_comm_id %d\n", 2521 __func__, IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg), 2522 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); 2523 2524 if (cur_cm_id_priv) { 2525 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0); 2526 cm_deref_id(cur_cm_id_priv); 2527 } 2528 2529 goto error; 2530 } 2531 spin_unlock(&cm.lock); 2532 2533 cm_id_priv->id.state = IB_CM_REP_RCVD; 2534 cm_id_priv->id.remote_id = 2535 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)); 2536 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2537 cm_id_priv->initiator_depth = 2538 IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg); 2539 cm_id_priv->responder_resources = 2540 IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg); 2541 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg)); 2542 cm_id_priv->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg); 2543 cm_id_priv->target_ack_delay = 2544 IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg); 2545 cm_id_priv->av.timeout = 2546 cm_ack_timeout(cm_id_priv->target_ack_delay, 2547 cm_id_priv->av.timeout - 1); 2548 cm_id_priv->alt_av.timeout = 2549 cm_ack_timeout(cm_id_priv->target_ack_delay, 2550 cm_id_priv->alt_av.timeout - 1); 2551 2552 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2553 cm_queue_work_unlock(cm_id_priv, work); 2554 return 0; 2555 2556 error: 2557 cm_deref_id(cm_id_priv); 2558 return ret; 2559 } 2560 2561 static int cm_establish_handler(struct cm_work *work) 2562 { 2563 struct cm_id_private *cm_id_priv; 2564 2565 /* See comment in cm_establish about lookup. */ 2566 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 2567 if (!cm_id_priv) 2568 return -EINVAL; 2569 2570 spin_lock_irq(&cm_id_priv->lock); 2571 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 2572 spin_unlock_irq(&cm_id_priv->lock); 2573 goto out; 2574 } 2575 2576 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2577 cm_queue_work_unlock(cm_id_priv, work); 2578 return 0; 2579 out: 2580 cm_deref_id(cm_id_priv); 2581 return -EINVAL; 2582 } 2583 2584 static int cm_rtu_handler(struct cm_work *work) 2585 { 2586 struct cm_id_private *cm_id_priv; 2587 struct cm_rtu_msg *rtu_msg; 2588 2589 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 2590 cm_id_priv = cm_acquire_id( 2591 cpu_to_be32(IBA_GET(CM_RTU_REMOTE_COMM_ID, rtu_msg)), 2592 cpu_to_be32(IBA_GET(CM_RTU_LOCAL_COMM_ID, rtu_msg))); 2593 if (!cm_id_priv) 2594 return -EINVAL; 2595 2596 work->cm_event.private_data = 2597 IBA_GET_MEM_PTR(CM_RTU_PRIVATE_DATA, rtu_msg); 2598 2599 spin_lock_irq(&cm_id_priv->lock); 2600 if (cm_id_priv->id.state != IB_CM_REP_SENT && 2601 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 2602 spin_unlock_irq(&cm_id_priv->lock); 2603 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2604 counter[CM_RTU_COUNTER]); 2605 goto out; 2606 } 2607 cm_id_priv->id.state = IB_CM_ESTABLISHED; 2608 2609 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2610 cm_queue_work_unlock(cm_id_priv, work); 2611 return 0; 2612 out: 2613 cm_deref_id(cm_id_priv); 2614 return -EINVAL; 2615 } 2616 2617 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 2618 struct cm_id_private *cm_id_priv, 2619 const void *private_data, 2620 u8 private_data_len) 2621 { 2622 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 2623 cm_form_tid(cm_id_priv)); 2624 IBA_SET(CM_DREQ_LOCAL_COMM_ID, dreq_msg, 2625 be32_to_cpu(cm_id_priv->id.local_id)); 2626 IBA_SET(CM_DREQ_REMOTE_COMM_ID, dreq_msg, 2627 be32_to_cpu(cm_id_priv->id.remote_id)); 2628 IBA_SET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg, 2629 be32_to_cpu(cm_id_priv->remote_qpn)); 2630 2631 if (private_data && private_data_len) 2632 IBA_SET_MEM(CM_DREQ_PRIVATE_DATA, dreq_msg, private_data, 2633 private_data_len); 2634 } 2635 2636 static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv, 2637 const void *private_data, u8 private_data_len) 2638 { 2639 struct ib_mad_send_buf *msg; 2640 int ret; 2641 2642 lockdep_assert_held(&cm_id_priv->lock); 2643 2644 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 2645 return -EINVAL; 2646 2647 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 2648 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__, 2649 be32_to_cpu(cm_id_priv->id.local_id), 2650 cm_id_priv->id.state); 2651 return -EINVAL; 2652 } 2653 2654 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2655 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2656 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2657 2658 ret = cm_alloc_msg(cm_id_priv, &msg); 2659 if (ret) { 2660 cm_enter_timewait(cm_id_priv); 2661 return ret; 2662 } 2663 2664 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 2665 private_data, private_data_len); 2666 msg->timeout_ms = cm_id_priv->timeout_ms; 2667 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2668 2669 ret = ib_post_send_mad(msg, NULL); 2670 if (ret) { 2671 cm_enter_timewait(cm_id_priv); 2672 cm_free_msg(msg); 2673 return ret; 2674 } 2675 2676 cm_id_priv->id.state = IB_CM_DREQ_SENT; 2677 cm_id_priv->msg = msg; 2678 return 0; 2679 } 2680 2681 int ib_send_cm_dreq(struct ib_cm_id *cm_id, const void *private_data, 2682 u8 private_data_len) 2683 { 2684 struct cm_id_private *cm_id_priv = 2685 container_of(cm_id, struct cm_id_private, id); 2686 unsigned long flags; 2687 int ret; 2688 2689 spin_lock_irqsave(&cm_id_priv->lock, flags); 2690 ret = cm_send_dreq_locked(cm_id_priv, private_data, private_data_len); 2691 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2692 return ret; 2693 } 2694 EXPORT_SYMBOL(ib_send_cm_dreq); 2695 2696 static void cm_format_drep(struct cm_drep_msg *drep_msg, 2697 struct cm_id_private *cm_id_priv, 2698 const void *private_data, 2699 u8 private_data_len) 2700 { 2701 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2702 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg, 2703 be32_to_cpu(cm_id_priv->id.local_id)); 2704 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg, 2705 be32_to_cpu(cm_id_priv->id.remote_id)); 2706 2707 if (private_data && private_data_len) 2708 IBA_SET_MEM(CM_DREP_PRIVATE_DATA, drep_msg, private_data, 2709 private_data_len); 2710 } 2711 2712 static int cm_send_drep_locked(struct cm_id_private *cm_id_priv, 2713 void *private_data, u8 private_data_len) 2714 { 2715 struct ib_mad_send_buf *msg; 2716 int ret; 2717 2718 lockdep_assert_held(&cm_id_priv->lock); 2719 2720 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2721 return -EINVAL; 2722 2723 if (cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2724 pr_debug( 2725 "%s: local_id %d, cm_idcm_id->state(%d) != IB_CM_DREQ_RCVD\n", 2726 __func__, be32_to_cpu(cm_id_priv->id.local_id), 2727 cm_id_priv->id.state); 2728 kfree(private_data); 2729 return -EINVAL; 2730 } 2731 2732 cm_set_private_data(cm_id_priv, private_data, private_data_len); 2733 cm_enter_timewait(cm_id_priv); 2734 2735 ret = cm_alloc_msg(cm_id_priv, &msg); 2736 if (ret) 2737 return ret; 2738 2739 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2740 private_data, private_data_len); 2741 2742 ret = ib_post_send_mad(msg, NULL); 2743 if (ret) { 2744 cm_free_msg(msg); 2745 return ret; 2746 } 2747 return 0; 2748 } 2749 2750 int ib_send_cm_drep(struct ib_cm_id *cm_id, const void *private_data, 2751 u8 private_data_len) 2752 { 2753 struct cm_id_private *cm_id_priv = 2754 container_of(cm_id, struct cm_id_private, id); 2755 unsigned long flags; 2756 void *data; 2757 int ret; 2758 2759 data = cm_copy_private_data(private_data, private_data_len); 2760 if (IS_ERR(data)) 2761 return PTR_ERR(data); 2762 2763 spin_lock_irqsave(&cm_id_priv->lock, flags); 2764 ret = cm_send_drep_locked(cm_id_priv, data, private_data_len); 2765 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2766 return ret; 2767 } 2768 EXPORT_SYMBOL(ib_send_cm_drep); 2769 2770 static int cm_issue_drep(struct cm_port *port, 2771 struct ib_mad_recv_wc *mad_recv_wc) 2772 { 2773 struct ib_mad_send_buf *msg = NULL; 2774 struct cm_dreq_msg *dreq_msg; 2775 struct cm_drep_msg *drep_msg; 2776 int ret; 2777 2778 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2779 if (ret) 2780 return ret; 2781 2782 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2783 drep_msg = (struct cm_drep_msg *) msg->mad; 2784 2785 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2786 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg, 2787 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg)); 2788 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg, 2789 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)); 2790 2791 ret = ib_post_send_mad(msg, NULL); 2792 if (ret) 2793 cm_free_msg(msg); 2794 2795 return ret; 2796 } 2797 2798 static int cm_dreq_handler(struct cm_work *work) 2799 { 2800 struct cm_id_private *cm_id_priv; 2801 struct cm_dreq_msg *dreq_msg; 2802 struct ib_mad_send_buf *msg = NULL; 2803 2804 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2805 cm_id_priv = cm_acquire_id( 2806 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)), 2807 cpu_to_be32(IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg))); 2808 if (!cm_id_priv) { 2809 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2810 counter[CM_DREQ_COUNTER]); 2811 cm_issue_drep(work->port, work->mad_recv_wc); 2812 pr_debug( 2813 "%s: no cm_id_priv, local_comm_id %d, remote_comm_id %d\n", 2814 __func__, IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg), 2815 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)); 2816 return -EINVAL; 2817 } 2818 2819 work->cm_event.private_data = 2820 IBA_GET_MEM_PTR(CM_DREQ_PRIVATE_DATA, dreq_msg); 2821 2822 spin_lock_irq(&cm_id_priv->lock); 2823 if (cm_id_priv->local_qpn != 2824 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg))) 2825 goto unlock; 2826 2827 switch (cm_id_priv->id.state) { 2828 case IB_CM_REP_SENT: 2829 case IB_CM_DREQ_SENT: 2830 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2831 break; 2832 case IB_CM_ESTABLISHED: 2833 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2834 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2835 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2836 break; 2837 case IB_CM_MRA_REP_RCVD: 2838 break; 2839 case IB_CM_TIMEWAIT: 2840 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2841 counter[CM_DREQ_COUNTER]); 2842 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc); 2843 if (IS_ERR(msg)) 2844 goto unlock; 2845 2846 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2847 cm_id_priv->private_data, 2848 cm_id_priv->private_data_len); 2849 spin_unlock_irq(&cm_id_priv->lock); 2850 2851 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || 2852 ib_post_send_mad(msg, NULL)) 2853 cm_free_msg(msg); 2854 goto deref; 2855 case IB_CM_DREQ_RCVD: 2856 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2857 counter[CM_DREQ_COUNTER]); 2858 goto unlock; 2859 default: 2860 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n", 2861 __func__, be32_to_cpu(cm_id_priv->id.local_id), 2862 cm_id_priv->id.state); 2863 goto unlock; 2864 } 2865 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2866 cm_id_priv->tid = dreq_msg->hdr.tid; 2867 cm_queue_work_unlock(cm_id_priv, work); 2868 return 0; 2869 2870 unlock: spin_unlock_irq(&cm_id_priv->lock); 2871 deref: cm_deref_id(cm_id_priv); 2872 return -EINVAL; 2873 } 2874 2875 static int cm_drep_handler(struct cm_work *work) 2876 { 2877 struct cm_id_private *cm_id_priv; 2878 struct cm_drep_msg *drep_msg; 2879 2880 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2881 cm_id_priv = cm_acquire_id( 2882 cpu_to_be32(IBA_GET(CM_DREP_REMOTE_COMM_ID, drep_msg)), 2883 cpu_to_be32(IBA_GET(CM_DREP_LOCAL_COMM_ID, drep_msg))); 2884 if (!cm_id_priv) 2885 return -EINVAL; 2886 2887 work->cm_event.private_data = 2888 IBA_GET_MEM_PTR(CM_DREP_PRIVATE_DATA, drep_msg); 2889 2890 spin_lock_irq(&cm_id_priv->lock); 2891 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2892 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2893 spin_unlock_irq(&cm_id_priv->lock); 2894 goto out; 2895 } 2896 cm_enter_timewait(cm_id_priv); 2897 2898 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2899 cm_queue_work_unlock(cm_id_priv, work); 2900 return 0; 2901 out: 2902 cm_deref_id(cm_id_priv); 2903 return -EINVAL; 2904 } 2905 2906 static int cm_send_rej_locked(struct cm_id_private *cm_id_priv, 2907 enum ib_cm_rej_reason reason, void *ari, 2908 u8 ari_length, const void *private_data, 2909 u8 private_data_len) 2910 { 2911 enum ib_cm_state state = cm_id_priv->id.state; 2912 struct ib_mad_send_buf *msg; 2913 int ret; 2914 2915 lockdep_assert_held(&cm_id_priv->lock); 2916 2917 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2918 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2919 return -EINVAL; 2920 2921 switch (state) { 2922 case IB_CM_REQ_SENT: 2923 case IB_CM_MRA_REQ_RCVD: 2924 case IB_CM_REQ_RCVD: 2925 case IB_CM_MRA_REQ_SENT: 2926 case IB_CM_REP_RCVD: 2927 case IB_CM_MRA_REP_SENT: 2928 cm_reset_to_idle(cm_id_priv); 2929 ret = cm_alloc_msg(cm_id_priv, &msg); 2930 if (ret) 2931 return ret; 2932 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason, 2933 ari, ari_length, private_data, private_data_len, 2934 state); 2935 break; 2936 case IB_CM_REP_SENT: 2937 case IB_CM_MRA_REP_RCVD: 2938 cm_enter_timewait(cm_id_priv); 2939 ret = cm_alloc_msg(cm_id_priv, &msg); 2940 if (ret) 2941 return ret; 2942 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason, 2943 ari, ari_length, private_data, private_data_len, 2944 state); 2945 break; 2946 default: 2947 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__, 2948 be32_to_cpu(cm_id_priv->id.local_id), 2949 cm_id_priv->id.state); 2950 return -EINVAL; 2951 } 2952 2953 ret = ib_post_send_mad(msg, NULL); 2954 if (ret) { 2955 cm_free_msg(msg); 2956 return ret; 2957 } 2958 2959 return 0; 2960 } 2961 2962 int ib_send_cm_rej(struct ib_cm_id *cm_id, enum ib_cm_rej_reason reason, 2963 void *ari, u8 ari_length, const void *private_data, 2964 u8 private_data_len) 2965 { 2966 struct cm_id_private *cm_id_priv = 2967 container_of(cm_id, struct cm_id_private, id); 2968 unsigned long flags; 2969 int ret; 2970 2971 spin_lock_irqsave(&cm_id_priv->lock, flags); 2972 ret = cm_send_rej_locked(cm_id_priv, reason, ari, ari_length, 2973 private_data, private_data_len); 2974 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2975 return ret; 2976 } 2977 EXPORT_SYMBOL(ib_send_cm_rej); 2978 2979 static void cm_format_rej_event(struct cm_work *work) 2980 { 2981 struct cm_rej_msg *rej_msg; 2982 struct ib_cm_rej_event_param *param; 2983 2984 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2985 param = &work->cm_event.param.rej_rcvd; 2986 param->ari = IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg); 2987 param->ari_length = IBA_GET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg); 2988 param->reason = IBA_GET(CM_REJ_REASON, rej_msg); 2989 work->cm_event.private_data = 2990 IBA_GET_MEM_PTR(CM_REJ_PRIVATE_DATA, rej_msg); 2991 } 2992 2993 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2994 { 2995 struct cm_id_private *cm_id_priv; 2996 __be32 remote_id; 2997 2998 remote_id = cpu_to_be32(IBA_GET(CM_REJ_LOCAL_COMM_ID, rej_msg)); 2999 3000 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_TIMEOUT) { 3001 cm_id_priv = cm_find_remote_id( 3002 *((__be64 *)IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg)), 3003 remote_id); 3004 } else if (IBA_GET(CM_REJ_MESSAGE_REJECTED, rej_msg) == 3005 CM_MSG_RESPONSE_REQ) 3006 cm_id_priv = cm_acquire_id( 3007 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)), 3008 0); 3009 else 3010 cm_id_priv = cm_acquire_id( 3011 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)), 3012 remote_id); 3013 3014 return cm_id_priv; 3015 } 3016 3017 static int cm_rej_handler(struct cm_work *work) 3018 { 3019 struct cm_id_private *cm_id_priv; 3020 struct cm_rej_msg *rej_msg; 3021 3022 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 3023 cm_id_priv = cm_acquire_rejected_id(rej_msg); 3024 if (!cm_id_priv) 3025 return -EINVAL; 3026 3027 cm_format_rej_event(work); 3028 3029 spin_lock_irq(&cm_id_priv->lock); 3030 switch (cm_id_priv->id.state) { 3031 case IB_CM_REQ_SENT: 3032 case IB_CM_MRA_REQ_RCVD: 3033 case IB_CM_REP_SENT: 3034 case IB_CM_MRA_REP_RCVD: 3035 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3036 /* fall through */ 3037 case IB_CM_REQ_RCVD: 3038 case IB_CM_MRA_REQ_SENT: 3039 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_STALE_CONN) 3040 cm_enter_timewait(cm_id_priv); 3041 else 3042 cm_reset_to_idle(cm_id_priv); 3043 break; 3044 case IB_CM_DREQ_SENT: 3045 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3046 /* fall through */ 3047 case IB_CM_REP_RCVD: 3048 case IB_CM_MRA_REP_SENT: 3049 cm_enter_timewait(cm_id_priv); 3050 break; 3051 case IB_CM_ESTABLISHED: 3052 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT || 3053 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) { 3054 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT) 3055 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 3056 cm_id_priv->msg); 3057 cm_enter_timewait(cm_id_priv); 3058 break; 3059 } 3060 /* fall through */ 3061 default: 3062 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n", 3063 __func__, be32_to_cpu(cm_id_priv->id.local_id), 3064 cm_id_priv->id.state); 3065 spin_unlock_irq(&cm_id_priv->lock); 3066 goto out; 3067 } 3068 3069 cm_queue_work_unlock(cm_id_priv, work); 3070 return 0; 3071 out: 3072 cm_deref_id(cm_id_priv); 3073 return -EINVAL; 3074 } 3075 3076 int ib_send_cm_mra(struct ib_cm_id *cm_id, 3077 u8 service_timeout, 3078 const void *private_data, 3079 u8 private_data_len) 3080 { 3081 struct cm_id_private *cm_id_priv; 3082 struct ib_mad_send_buf *msg; 3083 enum ib_cm_state cm_state; 3084 enum ib_cm_lap_state lap_state; 3085 enum cm_msg_response msg_response; 3086 void *data; 3087 unsigned long flags; 3088 int ret; 3089 3090 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 3091 return -EINVAL; 3092 3093 data = cm_copy_private_data(private_data, private_data_len); 3094 if (IS_ERR(data)) 3095 return PTR_ERR(data); 3096 3097 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3098 3099 spin_lock_irqsave(&cm_id_priv->lock, flags); 3100 switch(cm_id_priv->id.state) { 3101 case IB_CM_REQ_RCVD: 3102 cm_state = IB_CM_MRA_REQ_SENT; 3103 lap_state = cm_id->lap_state; 3104 msg_response = CM_MSG_RESPONSE_REQ; 3105 break; 3106 case IB_CM_REP_RCVD: 3107 cm_state = IB_CM_MRA_REP_SENT; 3108 lap_state = cm_id->lap_state; 3109 msg_response = CM_MSG_RESPONSE_REP; 3110 break; 3111 case IB_CM_ESTABLISHED: 3112 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 3113 cm_state = cm_id->state; 3114 lap_state = IB_CM_MRA_LAP_SENT; 3115 msg_response = CM_MSG_RESPONSE_OTHER; 3116 break; 3117 } 3118 /* fall through */ 3119 default: 3120 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n", 3121 __func__, be32_to_cpu(cm_id_priv->id.local_id), 3122 cm_id_priv->id.state); 3123 ret = -EINVAL; 3124 goto error1; 3125 } 3126 3127 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 3128 ret = cm_alloc_msg(cm_id_priv, &msg); 3129 if (ret) 3130 goto error1; 3131 3132 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 3133 msg_response, service_timeout, 3134 private_data, private_data_len); 3135 ret = ib_post_send_mad(msg, NULL); 3136 if (ret) 3137 goto error2; 3138 } 3139 3140 cm_id->state = cm_state; 3141 cm_id->lap_state = lap_state; 3142 cm_id_priv->service_timeout = service_timeout; 3143 cm_set_private_data(cm_id_priv, data, private_data_len); 3144 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3145 return 0; 3146 3147 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3148 kfree(data); 3149 return ret; 3150 3151 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3152 kfree(data); 3153 cm_free_msg(msg); 3154 return ret; 3155 } 3156 EXPORT_SYMBOL(ib_send_cm_mra); 3157 3158 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 3159 { 3160 switch (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg)) { 3161 case CM_MSG_RESPONSE_REQ: 3162 return cm_acquire_id( 3163 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)), 3164 0); 3165 case CM_MSG_RESPONSE_REP: 3166 case CM_MSG_RESPONSE_OTHER: 3167 return cm_acquire_id( 3168 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)), 3169 cpu_to_be32(IBA_GET(CM_MRA_LOCAL_COMM_ID, mra_msg))); 3170 default: 3171 return NULL; 3172 } 3173 } 3174 3175 static int cm_mra_handler(struct cm_work *work) 3176 { 3177 struct cm_id_private *cm_id_priv; 3178 struct cm_mra_msg *mra_msg; 3179 int timeout; 3180 3181 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 3182 cm_id_priv = cm_acquire_mraed_id(mra_msg); 3183 if (!cm_id_priv) 3184 return -EINVAL; 3185 3186 work->cm_event.private_data = 3187 IBA_GET_MEM_PTR(CM_MRA_PRIVATE_DATA, mra_msg); 3188 work->cm_event.param.mra_rcvd.service_timeout = 3189 IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg); 3190 timeout = cm_convert_to_ms(IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg)) + 3191 cm_convert_to_ms(cm_id_priv->av.timeout); 3192 3193 spin_lock_irq(&cm_id_priv->lock); 3194 switch (cm_id_priv->id.state) { 3195 case IB_CM_REQ_SENT: 3196 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != 3197 CM_MSG_RESPONSE_REQ || 3198 ib_modify_mad(cm_id_priv->av.port->mad_agent, 3199 cm_id_priv->msg, timeout)) 3200 goto out; 3201 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 3202 break; 3203 case IB_CM_REP_SENT: 3204 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != 3205 CM_MSG_RESPONSE_REP || 3206 ib_modify_mad(cm_id_priv->av.port->mad_agent, 3207 cm_id_priv->msg, timeout)) 3208 goto out; 3209 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 3210 break; 3211 case IB_CM_ESTABLISHED: 3212 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != 3213 CM_MSG_RESPONSE_OTHER || 3214 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 3215 ib_modify_mad(cm_id_priv->av.port->mad_agent, 3216 cm_id_priv->msg, timeout)) { 3217 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 3218 atomic_long_inc(&work->port-> 3219 counter_group[CM_RECV_DUPLICATES]. 3220 counter[CM_MRA_COUNTER]); 3221 goto out; 3222 } 3223 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 3224 break; 3225 case IB_CM_MRA_REQ_RCVD: 3226 case IB_CM_MRA_REP_RCVD: 3227 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3228 counter[CM_MRA_COUNTER]); 3229 /* fall through */ 3230 default: 3231 pr_debug("%s local_id %d, cm_id_priv->id.state: %d\n", 3232 __func__, be32_to_cpu(cm_id_priv->id.local_id), 3233 cm_id_priv->id.state); 3234 goto out; 3235 } 3236 3237 cm_id_priv->msg->context[1] = (void *) (unsigned long) 3238 cm_id_priv->id.state; 3239 cm_queue_work_unlock(cm_id_priv, work); 3240 return 0; 3241 out: 3242 spin_unlock_irq(&cm_id_priv->lock); 3243 cm_deref_id(cm_id_priv); 3244 return -EINVAL; 3245 } 3246 3247 static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg, 3248 struct sa_path_rec *path) 3249 { 3250 u32 lid; 3251 3252 if (path->rec_type != SA_PATH_REC_TYPE_OPA) { 3253 sa_path_set_dlid(path, IBA_GET(CM_LAP_ALTERNATE_LOCAL_PORT_LID, 3254 lap_msg)); 3255 sa_path_set_slid(path, IBA_GET(CM_LAP_ALTERNATE_REMOTE_PORT_LID, 3256 lap_msg)); 3257 } else { 3258 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 3259 CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg)); 3260 sa_path_set_dlid(path, lid); 3261 3262 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( 3263 CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg)); 3264 sa_path_set_slid(path, lid); 3265 } 3266 } 3267 3268 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 3269 struct sa_path_rec *path, 3270 struct cm_lap_msg *lap_msg) 3271 { 3272 path->dgid = *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg); 3273 path->sgid = 3274 *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg); 3275 path->flow_label = 3276 cpu_to_be32(IBA_GET(CM_LAP_ALTERNATE_FLOW_LABEL, lap_msg)); 3277 path->hop_limit = IBA_GET(CM_LAP_ALTERNATE_HOP_LIMIT, lap_msg); 3278 path->traffic_class = IBA_GET(CM_LAP_ALTERNATE_TRAFFIC_CLASS, lap_msg); 3279 path->reversible = 1; 3280 path->pkey = cm_id_priv->pkey; 3281 path->sl = IBA_GET(CM_LAP_ALTERNATE_SL, lap_msg); 3282 path->mtu_selector = IB_SA_EQ; 3283 path->mtu = cm_id_priv->path_mtu; 3284 path->rate_selector = IB_SA_EQ; 3285 path->rate = IBA_GET(CM_LAP_ALTERNATE_PACKET_RATE, lap_msg); 3286 path->packet_life_time_selector = IB_SA_EQ; 3287 path->packet_life_time = 3288 IBA_GET(CM_LAP_ALTERNATE_LOCAL_ACK_TIMEOUT, lap_msg); 3289 path->packet_life_time -= (path->packet_life_time > 0); 3290 cm_format_path_lid_from_lap(lap_msg, path); 3291 } 3292 3293 static int cm_lap_handler(struct cm_work *work) 3294 { 3295 struct cm_id_private *cm_id_priv; 3296 struct cm_lap_msg *lap_msg; 3297 struct ib_cm_lap_event_param *param; 3298 struct ib_mad_send_buf *msg = NULL; 3299 int ret; 3300 3301 /* Currently Alternate path messages are not supported for 3302 * RoCE link layer. 3303 */ 3304 if (rdma_protocol_roce(work->port->cm_dev->ib_device, 3305 work->port->port_num)) 3306 return -EINVAL; 3307 3308 /* todo: verify LAP request and send reject APR if invalid. */ 3309 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 3310 cm_id_priv = cm_acquire_id( 3311 cpu_to_be32(IBA_GET(CM_LAP_REMOTE_COMM_ID, lap_msg)), 3312 cpu_to_be32(IBA_GET(CM_LAP_LOCAL_COMM_ID, lap_msg))); 3313 if (!cm_id_priv) 3314 return -EINVAL; 3315 3316 param = &work->cm_event.param.lap_rcvd; 3317 memset(&work->path[0], 0, sizeof(work->path[1])); 3318 cm_path_set_rec_type(work->port->cm_dev->ib_device, 3319 work->port->port_num, &work->path[0], 3320 IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, 3321 lap_msg)); 3322 param->alternate_path = &work->path[0]; 3323 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 3324 work->cm_event.private_data = 3325 IBA_GET_MEM_PTR(CM_LAP_PRIVATE_DATA, lap_msg); 3326 3327 spin_lock_irq(&cm_id_priv->lock); 3328 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 3329 goto unlock; 3330 3331 switch (cm_id_priv->id.lap_state) { 3332 case IB_CM_LAP_UNINIT: 3333 case IB_CM_LAP_IDLE: 3334 break; 3335 case IB_CM_MRA_LAP_SENT: 3336 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3337 counter[CM_LAP_COUNTER]); 3338 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc); 3339 if (IS_ERR(msg)) 3340 goto unlock; 3341 3342 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 3343 CM_MSG_RESPONSE_OTHER, 3344 cm_id_priv->service_timeout, 3345 cm_id_priv->private_data, 3346 cm_id_priv->private_data_len); 3347 spin_unlock_irq(&cm_id_priv->lock); 3348 3349 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || 3350 ib_post_send_mad(msg, NULL)) 3351 cm_free_msg(msg); 3352 goto deref; 3353 case IB_CM_LAP_RCVD: 3354 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3355 counter[CM_LAP_COUNTER]); 3356 goto unlock; 3357 default: 3358 goto unlock; 3359 } 3360 3361 ret = cm_init_av_for_lap(work->port, work->mad_recv_wc->wc, 3362 work->mad_recv_wc->recv_buf.grh, 3363 &cm_id_priv->av); 3364 if (ret) 3365 goto unlock; 3366 3367 ret = cm_init_av_by_path(param->alternate_path, NULL, 3368 &cm_id_priv->alt_av, cm_id_priv); 3369 if (ret) 3370 goto unlock; 3371 3372 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 3373 cm_id_priv->tid = lap_msg->hdr.tid; 3374 cm_queue_work_unlock(cm_id_priv, work); 3375 return 0; 3376 3377 unlock: spin_unlock_irq(&cm_id_priv->lock); 3378 deref: cm_deref_id(cm_id_priv); 3379 return -EINVAL; 3380 } 3381 3382 static int cm_apr_handler(struct cm_work *work) 3383 { 3384 struct cm_id_private *cm_id_priv; 3385 struct cm_apr_msg *apr_msg; 3386 3387 /* Currently Alternate path messages are not supported for 3388 * RoCE link layer. 3389 */ 3390 if (rdma_protocol_roce(work->port->cm_dev->ib_device, 3391 work->port->port_num)) 3392 return -EINVAL; 3393 3394 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 3395 cm_id_priv = cm_acquire_id( 3396 cpu_to_be32(IBA_GET(CM_APR_REMOTE_COMM_ID, apr_msg)), 3397 cpu_to_be32(IBA_GET(CM_APR_LOCAL_COMM_ID, apr_msg))); 3398 if (!cm_id_priv) 3399 return -EINVAL; /* Unmatched reply. */ 3400 3401 work->cm_event.param.apr_rcvd.ap_status = 3402 IBA_GET(CM_APR_AR_STATUS, apr_msg); 3403 work->cm_event.param.apr_rcvd.apr_info = 3404 IBA_GET_MEM_PTR(CM_APR_ADDITIONAL_INFORMATION, apr_msg); 3405 work->cm_event.param.apr_rcvd.info_len = 3406 IBA_GET(CM_APR_ADDITIONAL_INFORMATION_LENGTH, apr_msg); 3407 work->cm_event.private_data = 3408 IBA_GET_MEM_PTR(CM_APR_PRIVATE_DATA, apr_msg); 3409 3410 spin_lock_irq(&cm_id_priv->lock); 3411 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 3412 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 3413 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 3414 spin_unlock_irq(&cm_id_priv->lock); 3415 goto out; 3416 } 3417 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 3418 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3419 cm_id_priv->msg = NULL; 3420 cm_queue_work_unlock(cm_id_priv, work); 3421 return 0; 3422 out: 3423 cm_deref_id(cm_id_priv); 3424 return -EINVAL; 3425 } 3426 3427 static int cm_timewait_handler(struct cm_work *work) 3428 { 3429 struct cm_timewait_info *timewait_info; 3430 struct cm_id_private *cm_id_priv; 3431 3432 timewait_info = container_of(work, struct cm_timewait_info, work); 3433 spin_lock_irq(&cm.lock); 3434 list_del(&timewait_info->list); 3435 spin_unlock_irq(&cm.lock); 3436 3437 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 3438 timewait_info->work.remote_id); 3439 if (!cm_id_priv) 3440 return -EINVAL; 3441 3442 spin_lock_irq(&cm_id_priv->lock); 3443 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 3444 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 3445 spin_unlock_irq(&cm_id_priv->lock); 3446 goto out; 3447 } 3448 cm_id_priv->id.state = IB_CM_IDLE; 3449 cm_queue_work_unlock(cm_id_priv, work); 3450 return 0; 3451 out: 3452 cm_deref_id(cm_id_priv); 3453 return -EINVAL; 3454 } 3455 3456 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 3457 struct cm_id_private *cm_id_priv, 3458 struct ib_cm_sidr_req_param *param) 3459 { 3460 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 3461 cm_form_tid(cm_id_priv)); 3462 IBA_SET(CM_SIDR_REQ_REQUESTID, sidr_req_msg, 3463 be32_to_cpu(cm_id_priv->id.local_id)); 3464 IBA_SET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg, 3465 be16_to_cpu(param->path->pkey)); 3466 IBA_SET(CM_SIDR_REQ_SERVICEID, sidr_req_msg, 3467 be64_to_cpu(param->service_id)); 3468 3469 if (param->private_data && param->private_data_len) 3470 IBA_SET_MEM(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg, 3471 param->private_data, param->private_data_len); 3472 } 3473 3474 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 3475 struct ib_cm_sidr_req_param *param) 3476 { 3477 struct cm_id_private *cm_id_priv; 3478 struct ib_mad_send_buf *msg; 3479 unsigned long flags; 3480 int ret; 3481 3482 if (!param->path || (param->private_data && 3483 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 3484 return -EINVAL; 3485 3486 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3487 ret = cm_init_av_by_path(param->path, param->sgid_attr, 3488 &cm_id_priv->av, 3489 cm_id_priv); 3490 if (ret) 3491 goto out; 3492 3493 cm_id->service_id = param->service_id; 3494 cm_id->service_mask = ~cpu_to_be64(0); 3495 cm_id_priv->timeout_ms = param->timeout_ms; 3496 cm_id_priv->max_cm_retries = param->max_cm_retries; 3497 ret = cm_alloc_msg(cm_id_priv, &msg); 3498 if (ret) 3499 goto out; 3500 3501 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 3502 param); 3503 msg->timeout_ms = cm_id_priv->timeout_ms; 3504 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 3505 3506 spin_lock_irqsave(&cm_id_priv->lock, flags); 3507 if (cm_id->state == IB_CM_IDLE) 3508 ret = ib_post_send_mad(msg, NULL); 3509 else 3510 ret = -EINVAL; 3511 3512 if (ret) { 3513 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3514 cm_free_msg(msg); 3515 goto out; 3516 } 3517 cm_id->state = IB_CM_SIDR_REQ_SENT; 3518 cm_id_priv->msg = msg; 3519 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3520 out: 3521 return ret; 3522 } 3523 EXPORT_SYMBOL(ib_send_cm_sidr_req); 3524 3525 static void cm_format_sidr_req_event(struct cm_work *work, 3526 const struct cm_id_private *rx_cm_id, 3527 struct ib_cm_id *listen_id) 3528 { 3529 struct cm_sidr_req_msg *sidr_req_msg; 3530 struct ib_cm_sidr_req_event_param *param; 3531 3532 sidr_req_msg = (struct cm_sidr_req_msg *) 3533 work->mad_recv_wc->recv_buf.mad; 3534 param = &work->cm_event.param.sidr_req_rcvd; 3535 param->pkey = IBA_GET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg); 3536 param->listen_id = listen_id; 3537 param->service_id = 3538 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg)); 3539 param->bth_pkey = cm_get_bth_pkey(work); 3540 param->port = work->port->port_num; 3541 param->sgid_attr = rx_cm_id->av.ah_attr.grh.sgid_attr; 3542 work->cm_event.private_data = 3543 IBA_GET_MEM_PTR(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg); 3544 } 3545 3546 static int cm_sidr_req_handler(struct cm_work *work) 3547 { 3548 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 3549 struct cm_sidr_req_msg *sidr_req_msg; 3550 struct ib_wc *wc; 3551 int ret; 3552 3553 cm_id_priv = 3554 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL); 3555 if (IS_ERR(cm_id_priv)) 3556 return PTR_ERR(cm_id_priv); 3557 3558 /* Record SGID/SLID and request ID for lookup. */ 3559 sidr_req_msg = (struct cm_sidr_req_msg *) 3560 work->mad_recv_wc->recv_buf.mad; 3561 3562 cm_id_priv->id.remote_id = 3563 cpu_to_be32(IBA_GET(CM_SIDR_REQ_REQUESTID, sidr_req_msg)); 3564 cm_id_priv->id.service_id = 3565 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg)); 3566 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 3567 cm_id_priv->tid = sidr_req_msg->hdr.tid; 3568 3569 wc = work->mad_recv_wc->wc; 3570 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 3571 cm_id_priv->av.dgid.global.interface_id = 0; 3572 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 3573 work->mad_recv_wc->recv_buf.grh, 3574 &cm_id_priv->av); 3575 if (ret) 3576 goto out; 3577 3578 spin_lock_irq(&cm.lock); 3579 listen_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 3580 if (listen_cm_id_priv) { 3581 spin_unlock_irq(&cm.lock); 3582 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3583 counter[CM_SIDR_REQ_COUNTER]); 3584 goto out; /* Duplicate message. */ 3585 } 3586 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3587 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 3588 cm_id_priv->id.service_id); 3589 if (!listen_cm_id_priv) { 3590 spin_unlock_irq(&cm.lock); 3591 ib_send_cm_sidr_rep(&cm_id_priv->id, 3592 &(struct ib_cm_sidr_rep_param){ 3593 .status = IB_SIDR_UNSUPPORTED }); 3594 goto out; /* No match. */ 3595 } 3596 spin_unlock_irq(&cm.lock); 3597 3598 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 3599 cm_id_priv->id.context = listen_cm_id_priv->id.context; 3600 3601 /* 3602 * A SIDR ID does not need to be in the xarray since it does not receive 3603 * mads, is not placed in the remote_id or remote_qpn rbtree, and does 3604 * not enter timewait. 3605 */ 3606 3607 cm_format_sidr_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 3608 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 3609 cm_free_work(work); 3610 /* 3611 * A pointer to the listen_cm_id is held in the event, so this deref 3612 * must be after the event is delivered above. 3613 */ 3614 cm_deref_id(listen_cm_id_priv); 3615 if (ret) 3616 cm_destroy_id(&cm_id_priv->id, ret); 3617 return 0; 3618 out: 3619 ib_destroy_cm_id(&cm_id_priv->id); 3620 return -EINVAL; 3621 } 3622 3623 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3624 struct cm_id_private *cm_id_priv, 3625 struct ib_cm_sidr_rep_param *param) 3626 { 3627 cm_format_mad_ece_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3628 cm_id_priv->tid, param->ece.attr_mod); 3629 IBA_SET(CM_SIDR_REP_REQUESTID, sidr_rep_msg, 3630 be32_to_cpu(cm_id_priv->id.remote_id)); 3631 IBA_SET(CM_SIDR_REP_STATUS, sidr_rep_msg, param->status); 3632 IBA_SET(CM_SIDR_REP_QPN, sidr_rep_msg, param->qp_num); 3633 IBA_SET(CM_SIDR_REP_SERVICEID, sidr_rep_msg, 3634 be64_to_cpu(cm_id_priv->id.service_id)); 3635 IBA_SET(CM_SIDR_REP_Q_KEY, sidr_rep_msg, param->qkey); 3636 IBA_SET(CM_SIDR_REP_VENDOR_ID_L, sidr_rep_msg, 3637 param->ece.vendor_id & 0xFF); 3638 IBA_SET(CM_SIDR_REP_VENDOR_ID_H, sidr_rep_msg, 3639 (param->ece.vendor_id >> 8) & 0xFF); 3640 3641 if (param->info && param->info_length) 3642 IBA_SET_MEM(CM_SIDR_REP_ADDITIONAL_INFORMATION, sidr_rep_msg, 3643 param->info, param->info_length); 3644 3645 if (param->private_data && param->private_data_len) 3646 IBA_SET_MEM(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg, 3647 param->private_data, param->private_data_len); 3648 } 3649 3650 static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv, 3651 struct ib_cm_sidr_rep_param *param) 3652 { 3653 struct ib_mad_send_buf *msg; 3654 int ret; 3655 3656 lockdep_assert_held(&cm_id_priv->lock); 3657 3658 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3659 (param->private_data && 3660 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3661 return -EINVAL; 3662 3663 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_RCVD) 3664 return -EINVAL; 3665 3666 ret = cm_alloc_msg(cm_id_priv, &msg); 3667 if (ret) 3668 return ret; 3669 3670 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3671 param); 3672 ret = ib_post_send_mad(msg, NULL); 3673 if (ret) { 3674 cm_free_msg(msg); 3675 return ret; 3676 } 3677 cm_id_priv->id.state = IB_CM_IDLE; 3678 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) { 3679 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3680 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); 3681 } 3682 return 0; 3683 } 3684 3685 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3686 struct ib_cm_sidr_rep_param *param) 3687 { 3688 struct cm_id_private *cm_id_priv = 3689 container_of(cm_id, struct cm_id_private, id); 3690 unsigned long flags; 3691 int ret; 3692 3693 spin_lock_irqsave(&cm_id_priv->lock, flags); 3694 ret = cm_send_sidr_rep_locked(cm_id_priv, param); 3695 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3696 return ret; 3697 } 3698 EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3699 3700 static void cm_format_sidr_rep_event(struct cm_work *work, 3701 const struct cm_id_private *cm_id_priv) 3702 { 3703 struct cm_sidr_rep_msg *sidr_rep_msg; 3704 struct ib_cm_sidr_rep_event_param *param; 3705 3706 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3707 work->mad_recv_wc->recv_buf.mad; 3708 param = &work->cm_event.param.sidr_rep_rcvd; 3709 param->status = IBA_GET(CM_SIDR_REP_STATUS, sidr_rep_msg); 3710 param->qkey = IBA_GET(CM_SIDR_REP_Q_KEY, sidr_rep_msg); 3711 param->qpn = IBA_GET(CM_SIDR_REP_QPN, sidr_rep_msg); 3712 param->info = IBA_GET_MEM_PTR(CM_SIDR_REP_ADDITIONAL_INFORMATION, 3713 sidr_rep_msg); 3714 param->info_len = IBA_GET(CM_SIDR_REP_ADDITIONAL_INFORMATION_LENGTH, 3715 sidr_rep_msg); 3716 param->sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr; 3717 work->cm_event.private_data = 3718 IBA_GET_MEM_PTR(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg); 3719 } 3720 3721 static int cm_sidr_rep_handler(struct cm_work *work) 3722 { 3723 struct cm_sidr_rep_msg *sidr_rep_msg; 3724 struct cm_id_private *cm_id_priv; 3725 3726 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3727 work->mad_recv_wc->recv_buf.mad; 3728 cm_id_priv = cm_acquire_id( 3729 cpu_to_be32(IBA_GET(CM_SIDR_REP_REQUESTID, sidr_rep_msg)), 0); 3730 if (!cm_id_priv) 3731 return -EINVAL; /* Unmatched reply. */ 3732 3733 spin_lock_irq(&cm_id_priv->lock); 3734 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3735 spin_unlock_irq(&cm_id_priv->lock); 3736 goto out; 3737 } 3738 cm_id_priv->id.state = IB_CM_IDLE; 3739 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3740 spin_unlock_irq(&cm_id_priv->lock); 3741 3742 cm_format_sidr_rep_event(work, cm_id_priv); 3743 cm_process_work(cm_id_priv, work); 3744 return 0; 3745 out: 3746 cm_deref_id(cm_id_priv); 3747 return -EINVAL; 3748 } 3749 3750 static void cm_process_send_error(struct ib_mad_send_buf *msg, 3751 enum ib_wc_status wc_status) 3752 { 3753 struct cm_id_private *cm_id_priv; 3754 struct ib_cm_event cm_event; 3755 enum ib_cm_state state; 3756 int ret; 3757 3758 memset(&cm_event, 0, sizeof cm_event); 3759 cm_id_priv = msg->context[0]; 3760 3761 /* Discard old sends or ones without a response. */ 3762 spin_lock_irq(&cm_id_priv->lock); 3763 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3764 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3765 goto discard; 3766 3767 pr_debug_ratelimited("CM: failed sending MAD in state %d. (%s)\n", 3768 state, ib_wc_status_msg(wc_status)); 3769 switch (state) { 3770 case IB_CM_REQ_SENT: 3771 case IB_CM_MRA_REQ_RCVD: 3772 cm_reset_to_idle(cm_id_priv); 3773 cm_event.event = IB_CM_REQ_ERROR; 3774 break; 3775 case IB_CM_REP_SENT: 3776 case IB_CM_MRA_REP_RCVD: 3777 cm_reset_to_idle(cm_id_priv); 3778 cm_event.event = IB_CM_REP_ERROR; 3779 break; 3780 case IB_CM_DREQ_SENT: 3781 cm_enter_timewait(cm_id_priv); 3782 cm_event.event = IB_CM_DREQ_ERROR; 3783 break; 3784 case IB_CM_SIDR_REQ_SENT: 3785 cm_id_priv->id.state = IB_CM_IDLE; 3786 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3787 break; 3788 default: 3789 goto discard; 3790 } 3791 spin_unlock_irq(&cm_id_priv->lock); 3792 cm_event.param.send_status = wc_status; 3793 3794 /* No other events can occur on the cm_id at this point. */ 3795 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3796 cm_free_msg(msg); 3797 if (ret) 3798 ib_destroy_cm_id(&cm_id_priv->id); 3799 return; 3800 discard: 3801 spin_unlock_irq(&cm_id_priv->lock); 3802 cm_free_msg(msg); 3803 } 3804 3805 static void cm_send_handler(struct ib_mad_agent *mad_agent, 3806 struct ib_mad_send_wc *mad_send_wc) 3807 { 3808 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3809 struct cm_port *port; 3810 u16 attr_index; 3811 3812 port = mad_agent->context; 3813 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3814 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3815 3816 /* 3817 * If the send was in response to a received message (context[0] is not 3818 * set to a cm_id), and is not a REJ, then it is a send that was 3819 * manually retried. 3820 */ 3821 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3822 msg->retries = 1; 3823 3824 atomic_long_add(1 + msg->retries, 3825 &port->counter_group[CM_XMIT].counter[attr_index]); 3826 if (msg->retries) 3827 atomic_long_add(msg->retries, 3828 &port->counter_group[CM_XMIT_RETRIES]. 3829 counter[attr_index]); 3830 3831 switch (mad_send_wc->status) { 3832 case IB_WC_SUCCESS: 3833 case IB_WC_WR_FLUSH_ERR: 3834 cm_free_msg(msg); 3835 break; 3836 default: 3837 if (msg->context[0] && msg->context[1]) 3838 cm_process_send_error(msg, mad_send_wc->status); 3839 else 3840 cm_free_msg(msg); 3841 break; 3842 } 3843 } 3844 3845 static void cm_work_handler(struct work_struct *_work) 3846 { 3847 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3848 int ret; 3849 3850 switch (work->cm_event.event) { 3851 case IB_CM_REQ_RECEIVED: 3852 ret = cm_req_handler(work); 3853 break; 3854 case IB_CM_MRA_RECEIVED: 3855 ret = cm_mra_handler(work); 3856 break; 3857 case IB_CM_REJ_RECEIVED: 3858 ret = cm_rej_handler(work); 3859 break; 3860 case IB_CM_REP_RECEIVED: 3861 ret = cm_rep_handler(work); 3862 break; 3863 case IB_CM_RTU_RECEIVED: 3864 ret = cm_rtu_handler(work); 3865 break; 3866 case IB_CM_USER_ESTABLISHED: 3867 ret = cm_establish_handler(work); 3868 break; 3869 case IB_CM_DREQ_RECEIVED: 3870 ret = cm_dreq_handler(work); 3871 break; 3872 case IB_CM_DREP_RECEIVED: 3873 ret = cm_drep_handler(work); 3874 break; 3875 case IB_CM_SIDR_REQ_RECEIVED: 3876 ret = cm_sidr_req_handler(work); 3877 break; 3878 case IB_CM_SIDR_REP_RECEIVED: 3879 ret = cm_sidr_rep_handler(work); 3880 break; 3881 case IB_CM_LAP_RECEIVED: 3882 ret = cm_lap_handler(work); 3883 break; 3884 case IB_CM_APR_RECEIVED: 3885 ret = cm_apr_handler(work); 3886 break; 3887 case IB_CM_TIMEWAIT_EXIT: 3888 ret = cm_timewait_handler(work); 3889 break; 3890 default: 3891 pr_debug("cm_event.event: 0x%x\n", work->cm_event.event); 3892 ret = -EINVAL; 3893 break; 3894 } 3895 if (ret) 3896 cm_free_work(work); 3897 } 3898 3899 static int cm_establish(struct ib_cm_id *cm_id) 3900 { 3901 struct cm_id_private *cm_id_priv; 3902 struct cm_work *work; 3903 unsigned long flags; 3904 int ret = 0; 3905 struct cm_device *cm_dev; 3906 3907 cm_dev = ib_get_client_data(cm_id->device, &cm_client); 3908 if (!cm_dev) 3909 return -ENODEV; 3910 3911 work = kmalloc(sizeof *work, GFP_ATOMIC); 3912 if (!work) 3913 return -ENOMEM; 3914 3915 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3916 spin_lock_irqsave(&cm_id_priv->lock, flags); 3917 switch (cm_id->state) 3918 { 3919 case IB_CM_REP_SENT: 3920 case IB_CM_MRA_REP_RCVD: 3921 cm_id->state = IB_CM_ESTABLISHED; 3922 break; 3923 case IB_CM_ESTABLISHED: 3924 ret = -EISCONN; 3925 break; 3926 default: 3927 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__, 3928 be32_to_cpu(cm_id->local_id), cm_id->state); 3929 ret = -EINVAL; 3930 break; 3931 } 3932 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3933 3934 if (ret) { 3935 kfree(work); 3936 goto out; 3937 } 3938 3939 /* 3940 * The CM worker thread may try to destroy the cm_id before it 3941 * can execute this work item. To prevent potential deadlock, 3942 * we need to find the cm_id once we're in the context of the 3943 * worker thread, rather than holding a reference on it. 3944 */ 3945 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3946 work->local_id = cm_id->local_id; 3947 work->remote_id = cm_id->remote_id; 3948 work->mad_recv_wc = NULL; 3949 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3950 3951 /* Check if the device started its remove_one */ 3952 spin_lock_irqsave(&cm.lock, flags); 3953 if (!cm_dev->going_down) { 3954 queue_delayed_work(cm.wq, &work->work, 0); 3955 } else { 3956 kfree(work); 3957 ret = -ENODEV; 3958 } 3959 spin_unlock_irqrestore(&cm.lock, flags); 3960 3961 out: 3962 return ret; 3963 } 3964 3965 static int cm_migrate(struct ib_cm_id *cm_id) 3966 { 3967 struct cm_id_private *cm_id_priv; 3968 struct cm_av tmp_av; 3969 unsigned long flags; 3970 int tmp_send_port_not_ready; 3971 int ret = 0; 3972 3973 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3974 spin_lock_irqsave(&cm_id_priv->lock, flags); 3975 if (cm_id->state == IB_CM_ESTABLISHED && 3976 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3977 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3978 cm_id->lap_state = IB_CM_LAP_IDLE; 3979 /* Swap address vector */ 3980 tmp_av = cm_id_priv->av; 3981 cm_id_priv->av = cm_id_priv->alt_av; 3982 cm_id_priv->alt_av = tmp_av; 3983 /* Swap port send ready state */ 3984 tmp_send_port_not_ready = cm_id_priv->prim_send_port_not_ready; 3985 cm_id_priv->prim_send_port_not_ready = cm_id_priv->altr_send_port_not_ready; 3986 cm_id_priv->altr_send_port_not_ready = tmp_send_port_not_ready; 3987 } else 3988 ret = -EINVAL; 3989 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3990 3991 return ret; 3992 } 3993 3994 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3995 { 3996 int ret; 3997 3998 switch (event) { 3999 case IB_EVENT_COMM_EST: 4000 ret = cm_establish(cm_id); 4001 break; 4002 case IB_EVENT_PATH_MIG: 4003 ret = cm_migrate(cm_id); 4004 break; 4005 default: 4006 ret = -EINVAL; 4007 } 4008 return ret; 4009 } 4010 EXPORT_SYMBOL(ib_cm_notify); 4011 4012 static void cm_recv_handler(struct ib_mad_agent *mad_agent, 4013 struct ib_mad_send_buf *send_buf, 4014 struct ib_mad_recv_wc *mad_recv_wc) 4015 { 4016 struct cm_port *port = mad_agent->context; 4017 struct cm_work *work; 4018 enum ib_cm_event_type event; 4019 bool alt_path = false; 4020 u16 attr_id; 4021 int paths = 0; 4022 int going_down = 0; 4023 4024 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 4025 case CM_REQ_ATTR_ID: 4026 alt_path = cm_req_has_alt_path((struct cm_req_msg *) 4027 mad_recv_wc->recv_buf.mad); 4028 paths = 1 + (alt_path != 0); 4029 event = IB_CM_REQ_RECEIVED; 4030 break; 4031 case CM_MRA_ATTR_ID: 4032 event = IB_CM_MRA_RECEIVED; 4033 break; 4034 case CM_REJ_ATTR_ID: 4035 event = IB_CM_REJ_RECEIVED; 4036 break; 4037 case CM_REP_ATTR_ID: 4038 event = IB_CM_REP_RECEIVED; 4039 break; 4040 case CM_RTU_ATTR_ID: 4041 event = IB_CM_RTU_RECEIVED; 4042 break; 4043 case CM_DREQ_ATTR_ID: 4044 event = IB_CM_DREQ_RECEIVED; 4045 break; 4046 case CM_DREP_ATTR_ID: 4047 event = IB_CM_DREP_RECEIVED; 4048 break; 4049 case CM_SIDR_REQ_ATTR_ID: 4050 event = IB_CM_SIDR_REQ_RECEIVED; 4051 break; 4052 case CM_SIDR_REP_ATTR_ID: 4053 event = IB_CM_SIDR_REP_RECEIVED; 4054 break; 4055 case CM_LAP_ATTR_ID: 4056 paths = 1; 4057 event = IB_CM_LAP_RECEIVED; 4058 break; 4059 case CM_APR_ATTR_ID: 4060 event = IB_CM_APR_RECEIVED; 4061 break; 4062 default: 4063 ib_free_recv_mad(mad_recv_wc); 4064 return; 4065 } 4066 4067 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 4068 atomic_long_inc(&port->counter_group[CM_RECV]. 4069 counter[attr_id - CM_ATTR_ID_OFFSET]); 4070 4071 work = kmalloc(struct_size(work, path, paths), GFP_KERNEL); 4072 if (!work) { 4073 ib_free_recv_mad(mad_recv_wc); 4074 return; 4075 } 4076 4077 INIT_DELAYED_WORK(&work->work, cm_work_handler); 4078 work->cm_event.event = event; 4079 work->mad_recv_wc = mad_recv_wc; 4080 work->port = port; 4081 4082 /* Check if the device started its remove_one */ 4083 spin_lock_irq(&cm.lock); 4084 if (!port->cm_dev->going_down) 4085 queue_delayed_work(cm.wq, &work->work, 0); 4086 else 4087 going_down = 1; 4088 spin_unlock_irq(&cm.lock); 4089 4090 if (going_down) { 4091 kfree(work); 4092 ib_free_recv_mad(mad_recv_wc); 4093 } 4094 } 4095 4096 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 4097 struct ib_qp_attr *qp_attr, 4098 int *qp_attr_mask) 4099 { 4100 unsigned long flags; 4101 int ret; 4102 4103 spin_lock_irqsave(&cm_id_priv->lock, flags); 4104 switch (cm_id_priv->id.state) { 4105 case IB_CM_REQ_SENT: 4106 case IB_CM_MRA_REQ_RCVD: 4107 case IB_CM_REQ_RCVD: 4108 case IB_CM_MRA_REQ_SENT: 4109 case IB_CM_REP_RCVD: 4110 case IB_CM_MRA_REP_SENT: 4111 case IB_CM_REP_SENT: 4112 case IB_CM_MRA_REP_RCVD: 4113 case IB_CM_ESTABLISHED: 4114 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 4115 IB_QP_PKEY_INDEX | IB_QP_PORT; 4116 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 4117 if (cm_id_priv->responder_resources) 4118 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 4119 IB_ACCESS_REMOTE_ATOMIC; 4120 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 4121 qp_attr->port_num = cm_id_priv->av.port->port_num; 4122 ret = 0; 4123 break; 4124 default: 4125 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n", 4126 __func__, be32_to_cpu(cm_id_priv->id.local_id), 4127 cm_id_priv->id.state); 4128 ret = -EINVAL; 4129 break; 4130 } 4131 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4132 return ret; 4133 } 4134 4135 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 4136 struct ib_qp_attr *qp_attr, 4137 int *qp_attr_mask) 4138 { 4139 unsigned long flags; 4140 int ret; 4141 4142 spin_lock_irqsave(&cm_id_priv->lock, flags); 4143 switch (cm_id_priv->id.state) { 4144 case IB_CM_REQ_RCVD: 4145 case IB_CM_MRA_REQ_SENT: 4146 case IB_CM_REP_RCVD: 4147 case IB_CM_MRA_REP_SENT: 4148 case IB_CM_REP_SENT: 4149 case IB_CM_MRA_REP_RCVD: 4150 case IB_CM_ESTABLISHED: 4151 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 4152 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 4153 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 4154 qp_attr->path_mtu = cm_id_priv->path_mtu; 4155 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 4156 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 4157 if (cm_id_priv->qp_type == IB_QPT_RC || 4158 cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 4159 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 4160 IB_QP_MIN_RNR_TIMER; 4161 qp_attr->max_dest_rd_atomic = 4162 cm_id_priv->responder_resources; 4163 qp_attr->min_rnr_timer = 0; 4164 } 4165 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) { 4166 *qp_attr_mask |= IB_QP_ALT_PATH; 4167 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 4168 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 4169 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 4170 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 4171 } 4172 ret = 0; 4173 break; 4174 default: 4175 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n", 4176 __func__, be32_to_cpu(cm_id_priv->id.local_id), 4177 cm_id_priv->id.state); 4178 ret = -EINVAL; 4179 break; 4180 } 4181 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4182 return ret; 4183 } 4184 4185 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 4186 struct ib_qp_attr *qp_attr, 4187 int *qp_attr_mask) 4188 { 4189 unsigned long flags; 4190 int ret; 4191 4192 spin_lock_irqsave(&cm_id_priv->lock, flags); 4193 switch (cm_id_priv->id.state) { 4194 /* Allow transition to RTS before sending REP */ 4195 case IB_CM_REQ_RCVD: 4196 case IB_CM_MRA_REQ_SENT: 4197 4198 case IB_CM_REP_RCVD: 4199 case IB_CM_MRA_REP_SENT: 4200 case IB_CM_REP_SENT: 4201 case IB_CM_MRA_REP_RCVD: 4202 case IB_CM_ESTABLISHED: 4203 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 4204 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 4205 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 4206 switch (cm_id_priv->qp_type) { 4207 case IB_QPT_RC: 4208 case IB_QPT_XRC_INI: 4209 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY | 4210 IB_QP_MAX_QP_RD_ATOMIC; 4211 qp_attr->retry_cnt = cm_id_priv->retry_count; 4212 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 4213 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 4214 /* fall through */ 4215 case IB_QPT_XRC_TGT: 4216 *qp_attr_mask |= IB_QP_TIMEOUT; 4217 qp_attr->timeout = cm_id_priv->av.timeout; 4218 break; 4219 default: 4220 break; 4221 } 4222 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) { 4223 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 4224 qp_attr->path_mig_state = IB_MIG_REARM; 4225 } 4226 } else { 4227 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 4228 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 4229 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 4230 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 4231 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 4232 qp_attr->path_mig_state = IB_MIG_REARM; 4233 } 4234 ret = 0; 4235 break; 4236 default: 4237 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n", 4238 __func__, be32_to_cpu(cm_id_priv->id.local_id), 4239 cm_id_priv->id.state); 4240 ret = -EINVAL; 4241 break; 4242 } 4243 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4244 return ret; 4245 } 4246 4247 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 4248 struct ib_qp_attr *qp_attr, 4249 int *qp_attr_mask) 4250 { 4251 struct cm_id_private *cm_id_priv; 4252 int ret; 4253 4254 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 4255 switch (qp_attr->qp_state) { 4256 case IB_QPS_INIT: 4257 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 4258 break; 4259 case IB_QPS_RTR: 4260 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 4261 break; 4262 case IB_QPS_RTS: 4263 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 4264 break; 4265 default: 4266 ret = -EINVAL; 4267 break; 4268 } 4269 return ret; 4270 } 4271 EXPORT_SYMBOL(ib_cm_init_qp_attr); 4272 4273 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 4274 char *buf) 4275 { 4276 struct cm_counter_group *group; 4277 struct cm_counter_attribute *cm_attr; 4278 4279 group = container_of(obj, struct cm_counter_group, obj); 4280 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 4281 4282 return sprintf(buf, "%ld\n", 4283 atomic_long_read(&group->counter[cm_attr->index])); 4284 } 4285 4286 static const struct sysfs_ops cm_counter_ops = { 4287 .show = cm_show_counter 4288 }; 4289 4290 static struct kobj_type cm_counter_obj_type = { 4291 .sysfs_ops = &cm_counter_ops, 4292 .default_attrs = cm_counter_default_attrs 4293 }; 4294 4295 static char *cm_devnode(struct device *dev, umode_t *mode) 4296 { 4297 if (mode) 4298 *mode = 0666; 4299 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 4300 } 4301 4302 struct class cm_class = { 4303 .owner = THIS_MODULE, 4304 .name = "infiniband_cm", 4305 .devnode = cm_devnode, 4306 }; 4307 EXPORT_SYMBOL(cm_class); 4308 4309 static int cm_create_port_fs(struct cm_port *port) 4310 { 4311 int i, ret; 4312 4313 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 4314 ret = ib_port_register_module_stat(port->cm_dev->ib_device, 4315 port->port_num, 4316 &port->counter_group[i].obj, 4317 &cm_counter_obj_type, 4318 counter_group_names[i]); 4319 if (ret) 4320 goto error; 4321 } 4322 4323 return 0; 4324 4325 error: 4326 while (i--) 4327 ib_port_unregister_module_stat(&port->counter_group[i].obj); 4328 return ret; 4329 4330 } 4331 4332 static void cm_remove_port_fs(struct cm_port *port) 4333 { 4334 int i; 4335 4336 for (i = 0; i < CM_COUNTER_GROUPS; i++) 4337 ib_port_unregister_module_stat(&port->counter_group[i].obj); 4338 4339 } 4340 4341 static int cm_add_one(struct ib_device *ib_device) 4342 { 4343 struct cm_device *cm_dev; 4344 struct cm_port *port; 4345 struct ib_mad_reg_req reg_req = { 4346 .mgmt_class = IB_MGMT_CLASS_CM, 4347 .mgmt_class_version = IB_CM_CLASS_VERSION, 4348 }; 4349 struct ib_port_modify port_modify = { 4350 .set_port_cap_mask = IB_PORT_CM_SUP 4351 }; 4352 unsigned long flags; 4353 int ret; 4354 int count = 0; 4355 u8 i; 4356 4357 cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt), 4358 GFP_KERNEL); 4359 if (!cm_dev) 4360 return -ENOMEM; 4361 4362 cm_dev->ib_device = ib_device; 4363 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay; 4364 cm_dev->going_down = 0; 4365 4366 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 4367 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 4368 if (!rdma_cap_ib_cm(ib_device, i)) 4369 continue; 4370 4371 port = kzalloc(sizeof *port, GFP_KERNEL); 4372 if (!port) { 4373 ret = -ENOMEM; 4374 goto error1; 4375 } 4376 4377 cm_dev->port[i-1] = port; 4378 port->cm_dev = cm_dev; 4379 port->port_num = i; 4380 4381 INIT_LIST_HEAD(&port->cm_priv_prim_list); 4382 INIT_LIST_HEAD(&port->cm_priv_altr_list); 4383 4384 ret = cm_create_port_fs(port); 4385 if (ret) 4386 goto error1; 4387 4388 port->mad_agent = ib_register_mad_agent(ib_device, i, 4389 IB_QPT_GSI, 4390 ®_req, 4391 0, 4392 cm_send_handler, 4393 cm_recv_handler, 4394 port, 4395 0); 4396 if (IS_ERR(port->mad_agent)) { 4397 ret = PTR_ERR(port->mad_agent); 4398 goto error2; 4399 } 4400 4401 ret = ib_modify_port(ib_device, i, 0, &port_modify); 4402 if (ret) 4403 goto error3; 4404 4405 count++; 4406 } 4407 4408 if (!count) { 4409 ret = -EOPNOTSUPP; 4410 goto free; 4411 } 4412 4413 ib_set_client_data(ib_device, &cm_client, cm_dev); 4414 4415 write_lock_irqsave(&cm.device_lock, flags); 4416 list_add_tail(&cm_dev->list, &cm.device_list); 4417 write_unlock_irqrestore(&cm.device_lock, flags); 4418 return 0; 4419 4420 error3: 4421 ib_unregister_mad_agent(port->mad_agent); 4422 error2: 4423 cm_remove_port_fs(port); 4424 error1: 4425 port_modify.set_port_cap_mask = 0; 4426 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 4427 kfree(port); 4428 while (--i) { 4429 if (!rdma_cap_ib_cm(ib_device, i)) 4430 continue; 4431 4432 port = cm_dev->port[i-1]; 4433 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4434 ib_unregister_mad_agent(port->mad_agent); 4435 cm_remove_port_fs(port); 4436 kfree(port); 4437 } 4438 free: 4439 kfree(cm_dev); 4440 return ret; 4441 } 4442 4443 static void cm_remove_one(struct ib_device *ib_device, void *client_data) 4444 { 4445 struct cm_device *cm_dev = client_data; 4446 struct cm_port *port; 4447 struct cm_id_private *cm_id_priv; 4448 struct ib_mad_agent *cur_mad_agent; 4449 struct ib_port_modify port_modify = { 4450 .clr_port_cap_mask = IB_PORT_CM_SUP 4451 }; 4452 unsigned long flags; 4453 int i; 4454 4455 write_lock_irqsave(&cm.device_lock, flags); 4456 list_del(&cm_dev->list); 4457 write_unlock_irqrestore(&cm.device_lock, flags); 4458 4459 spin_lock_irq(&cm.lock); 4460 cm_dev->going_down = 1; 4461 spin_unlock_irq(&cm.lock); 4462 4463 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 4464 if (!rdma_cap_ib_cm(ib_device, i)) 4465 continue; 4466 4467 port = cm_dev->port[i-1]; 4468 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4469 /* Mark all the cm_id's as not valid */ 4470 spin_lock_irq(&cm.lock); 4471 list_for_each_entry(cm_id_priv, &port->cm_priv_altr_list, altr_list) 4472 cm_id_priv->altr_send_port_not_ready = 1; 4473 list_for_each_entry(cm_id_priv, &port->cm_priv_prim_list, prim_list) 4474 cm_id_priv->prim_send_port_not_ready = 1; 4475 spin_unlock_irq(&cm.lock); 4476 /* 4477 * We flush the queue here after the going_down set, this 4478 * verify that no new works will be queued in the recv handler, 4479 * after that we can call the unregister_mad_agent 4480 */ 4481 flush_workqueue(cm.wq); 4482 spin_lock_irq(&cm.state_lock); 4483 cur_mad_agent = port->mad_agent; 4484 port->mad_agent = NULL; 4485 spin_unlock_irq(&cm.state_lock); 4486 ib_unregister_mad_agent(cur_mad_agent); 4487 cm_remove_port_fs(port); 4488 kfree(port); 4489 } 4490 4491 kfree(cm_dev); 4492 } 4493 4494 static int __init ib_cm_init(void) 4495 { 4496 int ret; 4497 4498 INIT_LIST_HEAD(&cm.device_list); 4499 rwlock_init(&cm.device_lock); 4500 spin_lock_init(&cm.lock); 4501 spin_lock_init(&cm.state_lock); 4502 cm.listen_service_table = RB_ROOT; 4503 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 4504 cm.remote_id_table = RB_ROOT; 4505 cm.remote_qp_table = RB_ROOT; 4506 cm.remote_sidr_table = RB_ROOT; 4507 xa_init_flags(&cm.local_id_table, XA_FLAGS_ALLOC | XA_FLAGS_LOCK_IRQ); 4508 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 4509 INIT_LIST_HEAD(&cm.timewait_list); 4510 4511 ret = class_register(&cm_class); 4512 if (ret) { 4513 ret = -ENOMEM; 4514 goto error1; 4515 } 4516 4517 cm.wq = alloc_workqueue("ib_cm", 0, 1); 4518 if (!cm.wq) { 4519 ret = -ENOMEM; 4520 goto error2; 4521 } 4522 4523 ret = ib_register_client(&cm_client); 4524 if (ret) 4525 goto error3; 4526 4527 return 0; 4528 error3: 4529 destroy_workqueue(cm.wq); 4530 error2: 4531 class_unregister(&cm_class); 4532 error1: 4533 return ret; 4534 } 4535 4536 static void __exit ib_cm_cleanup(void) 4537 { 4538 struct cm_timewait_info *timewait_info, *tmp; 4539 4540 spin_lock_irq(&cm.lock); 4541 list_for_each_entry(timewait_info, &cm.timewait_list, list) 4542 cancel_delayed_work(&timewait_info->work.work); 4543 spin_unlock_irq(&cm.lock); 4544 4545 ib_unregister_client(&cm_client); 4546 destroy_workqueue(cm.wq); 4547 4548 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 4549 list_del(&timewait_info->list); 4550 kfree(timewait_info); 4551 } 4552 4553 class_unregister(&cm_class); 4554 WARN_ON(!xa_empty(&cm.local_id_table)); 4555 } 4556 4557 module_init(ib_cm_init); 4558 module_exit(ib_cm_cleanup); 4559