1 /* 2 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved. 3 * Copyright (c) 2004 Topspin Corporation. All rights reserved. 4 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved. 5 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. 6 * 7 * This software is available to you under a choice of one of two 8 * licenses. You may choose to be licensed under the terms of the GNU 9 * General Public License (GPL) Version 2, available from the file 10 * COPYING in the main directory of this source tree, or the 11 * OpenIB.org BSD license below: 12 * 13 * Redistribution and use in source and binary forms, with or 14 * without modification, are permitted provided that the following 15 * conditions are met: 16 * 17 * - Redistributions of source code must retain the above 18 * copyright notice, this list of conditions and the following 19 * disclaimer. 20 * 21 * - Redistributions in binary form must reproduce the above 22 * copyright notice, this list of conditions and the following 23 * disclaimer in the documentation and/or other materials 24 * provided with the distribution. 25 * 26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 33 * SOFTWARE. 34 */ 35 36 #include <linux/completion.h> 37 #include <linux/dma-mapping.h> 38 #include <linux/device.h> 39 #include <linux/module.h> 40 #include <linux/err.h> 41 #include <linux/idr.h> 42 #include <linux/interrupt.h> 43 #include <linux/random.h> 44 #include <linux/rbtree.h> 45 #include <linux/spinlock.h> 46 #include <linux/slab.h> 47 #include <linux/sysfs.h> 48 #include <linux/workqueue.h> 49 #include <linux/kdev_t.h> 50 #include <linux/etherdevice.h> 51 52 #include <rdma/ib_cache.h> 53 #include <rdma/ib_cm.h> 54 #include "cm_msgs.h" 55 56 MODULE_AUTHOR("Sean Hefty"); 57 MODULE_DESCRIPTION("InfiniBand CM"); 58 MODULE_LICENSE("Dual BSD/GPL"); 59 60 static const char * const ibcm_rej_reason_strs[] = { 61 [IB_CM_REJ_NO_QP] = "no QP", 62 [IB_CM_REJ_NO_EEC] = "no EEC", 63 [IB_CM_REJ_NO_RESOURCES] = "no resources", 64 [IB_CM_REJ_TIMEOUT] = "timeout", 65 [IB_CM_REJ_UNSUPPORTED] = "unsupported", 66 [IB_CM_REJ_INVALID_COMM_ID] = "invalid comm ID", 67 [IB_CM_REJ_INVALID_COMM_INSTANCE] = "invalid comm instance", 68 [IB_CM_REJ_INVALID_SERVICE_ID] = "invalid service ID", 69 [IB_CM_REJ_INVALID_TRANSPORT_TYPE] = "invalid transport type", 70 [IB_CM_REJ_STALE_CONN] = "stale conn", 71 [IB_CM_REJ_RDC_NOT_EXIST] = "RDC not exist", 72 [IB_CM_REJ_INVALID_GID] = "invalid GID", 73 [IB_CM_REJ_INVALID_LID] = "invalid LID", 74 [IB_CM_REJ_INVALID_SL] = "invalid SL", 75 [IB_CM_REJ_INVALID_TRAFFIC_CLASS] = "invalid traffic class", 76 [IB_CM_REJ_INVALID_HOP_LIMIT] = "invalid hop limit", 77 [IB_CM_REJ_INVALID_PACKET_RATE] = "invalid packet rate", 78 [IB_CM_REJ_INVALID_ALT_GID] = "invalid alt GID", 79 [IB_CM_REJ_INVALID_ALT_LID] = "invalid alt LID", 80 [IB_CM_REJ_INVALID_ALT_SL] = "invalid alt SL", 81 [IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS] = "invalid alt traffic class", 82 [IB_CM_REJ_INVALID_ALT_HOP_LIMIT] = "invalid alt hop limit", 83 [IB_CM_REJ_INVALID_ALT_PACKET_RATE] = "invalid alt packet rate", 84 [IB_CM_REJ_PORT_CM_REDIRECT] = "port CM redirect", 85 [IB_CM_REJ_PORT_REDIRECT] = "port redirect", 86 [IB_CM_REJ_INVALID_MTU] = "invalid MTU", 87 [IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES] = "insufficient resp resources", 88 [IB_CM_REJ_CONSUMER_DEFINED] = "consumer defined", 89 [IB_CM_REJ_INVALID_RNR_RETRY] = "invalid RNR retry", 90 [IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID] = "duplicate local comm ID", 91 [IB_CM_REJ_INVALID_CLASS_VERSION] = "invalid class version", 92 [IB_CM_REJ_INVALID_FLOW_LABEL] = "invalid flow label", 93 [IB_CM_REJ_INVALID_ALT_FLOW_LABEL] = "invalid alt flow label", 94 }; 95 96 const char *__attribute_const__ ibcm_reject_msg(int reason) 97 { 98 size_t index = reason; 99 100 if (index < ARRAY_SIZE(ibcm_rej_reason_strs) && 101 ibcm_rej_reason_strs[index]) 102 return ibcm_rej_reason_strs[index]; 103 else 104 return "unrecognized reason"; 105 } 106 EXPORT_SYMBOL(ibcm_reject_msg); 107 108 static void cm_add_one(struct ib_device *device); 109 static void cm_remove_one(struct ib_device *device, void *client_data); 110 111 static struct ib_client cm_client = { 112 .name = "cm", 113 .add = cm_add_one, 114 .remove = cm_remove_one 115 }; 116 117 static struct ib_cm { 118 spinlock_t lock; 119 struct list_head device_list; 120 rwlock_t device_lock; 121 struct rb_root listen_service_table; 122 u64 listen_service_id; 123 /* struct rb_root peer_service_table; todo: fix peer to peer */ 124 struct rb_root remote_qp_table; 125 struct rb_root remote_id_table; 126 struct rb_root remote_sidr_table; 127 struct idr local_id_table; 128 __be32 random_id_operand; 129 struct list_head timewait_list; 130 struct workqueue_struct *wq; 131 /* Sync on cm change port state */ 132 spinlock_t state_lock; 133 } cm; 134 135 /* Counter indexes ordered by attribute ID */ 136 enum { 137 CM_REQ_COUNTER, 138 CM_MRA_COUNTER, 139 CM_REJ_COUNTER, 140 CM_REP_COUNTER, 141 CM_RTU_COUNTER, 142 CM_DREQ_COUNTER, 143 CM_DREP_COUNTER, 144 CM_SIDR_REQ_COUNTER, 145 CM_SIDR_REP_COUNTER, 146 CM_LAP_COUNTER, 147 CM_APR_COUNTER, 148 CM_ATTR_COUNT, 149 CM_ATTR_ID_OFFSET = 0x0010, 150 }; 151 152 enum { 153 CM_XMIT, 154 CM_XMIT_RETRIES, 155 CM_RECV, 156 CM_RECV_DUPLICATES, 157 CM_COUNTER_GROUPS 158 }; 159 160 static char const counter_group_names[CM_COUNTER_GROUPS] 161 [sizeof("cm_rx_duplicates")] = { 162 "cm_tx_msgs", "cm_tx_retries", 163 "cm_rx_msgs", "cm_rx_duplicates" 164 }; 165 166 struct cm_counter_group { 167 struct kobject obj; 168 atomic_long_t counter[CM_ATTR_COUNT]; 169 }; 170 171 struct cm_counter_attribute { 172 struct attribute attr; 173 int index; 174 }; 175 176 #define CM_COUNTER_ATTR(_name, _index) \ 177 struct cm_counter_attribute cm_##_name##_counter_attr = { \ 178 .attr = { .name = __stringify(_name), .mode = 0444 }, \ 179 .index = _index \ 180 } 181 182 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER); 183 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER); 184 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER); 185 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER); 186 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER); 187 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER); 188 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER); 189 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER); 190 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER); 191 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER); 192 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER); 193 194 static struct attribute *cm_counter_default_attrs[] = { 195 &cm_req_counter_attr.attr, 196 &cm_mra_counter_attr.attr, 197 &cm_rej_counter_attr.attr, 198 &cm_rep_counter_attr.attr, 199 &cm_rtu_counter_attr.attr, 200 &cm_dreq_counter_attr.attr, 201 &cm_drep_counter_attr.attr, 202 &cm_sidr_req_counter_attr.attr, 203 &cm_sidr_rep_counter_attr.attr, 204 &cm_lap_counter_attr.attr, 205 &cm_apr_counter_attr.attr, 206 NULL 207 }; 208 209 struct cm_port { 210 struct cm_device *cm_dev; 211 struct ib_mad_agent *mad_agent; 212 struct kobject port_obj; 213 u8 port_num; 214 struct list_head cm_priv_prim_list; 215 struct list_head cm_priv_altr_list; 216 struct cm_counter_group counter_group[CM_COUNTER_GROUPS]; 217 }; 218 219 struct cm_device { 220 struct list_head list; 221 struct ib_device *ib_device; 222 struct device *device; 223 u8 ack_delay; 224 int going_down; 225 struct cm_port *port[0]; 226 }; 227 228 struct cm_av { 229 struct cm_port *port; 230 union ib_gid dgid; 231 struct rdma_ah_attr ah_attr; 232 u16 pkey_index; 233 u8 timeout; 234 }; 235 236 struct cm_work { 237 struct delayed_work work; 238 struct list_head list; 239 struct cm_port *port; 240 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 241 __be32 local_id; /* Established / timewait */ 242 __be32 remote_id; 243 struct ib_cm_event cm_event; 244 struct sa_path_rec path[0]; 245 }; 246 247 struct cm_timewait_info { 248 struct cm_work work; /* Must be first. */ 249 struct list_head list; 250 struct rb_node remote_qp_node; 251 struct rb_node remote_id_node; 252 __be64 remote_ca_guid; 253 __be32 remote_qpn; 254 u8 inserted_remote_qp; 255 u8 inserted_remote_id; 256 }; 257 258 struct cm_id_private { 259 struct ib_cm_id id; 260 261 struct rb_node service_node; 262 struct rb_node sidr_id_node; 263 spinlock_t lock; /* Do not acquire inside cm.lock */ 264 struct completion comp; 265 atomic_t refcount; 266 /* Number of clients sharing this ib_cm_id. Only valid for listeners. 267 * Protected by the cm.lock spinlock. */ 268 int listen_sharecount; 269 270 struct ib_mad_send_buf *msg; 271 struct cm_timewait_info *timewait_info; 272 /* todo: use alternate port on send failure */ 273 struct cm_av av; 274 struct cm_av alt_av; 275 276 void *private_data; 277 __be64 tid; 278 __be32 local_qpn; 279 __be32 remote_qpn; 280 enum ib_qp_type qp_type; 281 __be32 sq_psn; 282 __be32 rq_psn; 283 int timeout_ms; 284 enum ib_mtu path_mtu; 285 __be16 pkey; 286 u8 private_data_len; 287 u8 max_cm_retries; 288 u8 peer_to_peer; 289 u8 responder_resources; 290 u8 initiator_depth; 291 u8 retry_count; 292 u8 rnr_retry_count; 293 u8 service_timeout; 294 u8 target_ack_delay; 295 296 struct list_head prim_list; 297 struct list_head altr_list; 298 /* Indicates that the send port mad is registered and av is set */ 299 int prim_send_port_not_ready; 300 int altr_send_port_not_ready; 301 302 struct list_head work_list; 303 atomic_t work_count; 304 }; 305 306 static void cm_work_handler(struct work_struct *work); 307 308 static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 309 { 310 if (atomic_dec_and_test(&cm_id_priv->refcount)) 311 complete(&cm_id_priv->comp); 312 } 313 314 static int cm_alloc_msg(struct cm_id_private *cm_id_priv, 315 struct ib_mad_send_buf **msg) 316 { 317 struct ib_mad_agent *mad_agent; 318 struct ib_mad_send_buf *m; 319 struct ib_ah *ah; 320 struct cm_av *av; 321 unsigned long flags, flags2; 322 int ret = 0; 323 324 /* don't let the port to be released till the agent is down */ 325 spin_lock_irqsave(&cm.state_lock, flags2); 326 spin_lock_irqsave(&cm.lock, flags); 327 if (!cm_id_priv->prim_send_port_not_ready) 328 av = &cm_id_priv->av; 329 else if (!cm_id_priv->altr_send_port_not_ready && 330 (cm_id_priv->alt_av.port)) 331 av = &cm_id_priv->alt_av; 332 else { 333 pr_info("%s: not valid CM id\n", __func__); 334 ret = -ENODEV; 335 spin_unlock_irqrestore(&cm.lock, flags); 336 goto out; 337 } 338 spin_unlock_irqrestore(&cm.lock, flags); 339 /* Make sure the port haven't released the mad yet */ 340 mad_agent = cm_id_priv->av.port->mad_agent; 341 if (!mad_agent) { 342 pr_info("%s: not a valid MAD agent\n", __func__); 343 ret = -ENODEV; 344 goto out; 345 } 346 ah = rdma_create_ah(mad_agent->qp->pd, &av->ah_attr); 347 if (IS_ERR(ah)) { 348 ret = PTR_ERR(ah); 349 goto out; 350 } 351 352 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 353 av->pkey_index, 354 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 355 GFP_ATOMIC, 356 IB_MGMT_BASE_VERSION); 357 if (IS_ERR(m)) { 358 rdma_destroy_ah(ah); 359 ret = PTR_ERR(m); 360 goto out; 361 } 362 363 /* Timeout set by caller if response is expected. */ 364 m->ah = ah; 365 m->retries = cm_id_priv->max_cm_retries; 366 367 atomic_inc(&cm_id_priv->refcount); 368 m->context[0] = cm_id_priv; 369 *msg = m; 370 371 out: 372 spin_unlock_irqrestore(&cm.state_lock, flags2); 373 return ret; 374 } 375 376 static struct ib_mad_send_buf *cm_alloc_response_msg_no_ah(struct cm_port *port, 377 struct ib_mad_recv_wc *mad_recv_wc) 378 { 379 return ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 380 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 381 GFP_ATOMIC, 382 IB_MGMT_BASE_VERSION); 383 } 384 385 static int cm_create_response_msg_ah(struct cm_port *port, 386 struct ib_mad_recv_wc *mad_recv_wc, 387 struct ib_mad_send_buf *msg) 388 { 389 struct ib_ah *ah; 390 391 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 392 mad_recv_wc->recv_buf.grh, port->port_num); 393 if (IS_ERR(ah)) 394 return PTR_ERR(ah); 395 396 msg->ah = ah; 397 return 0; 398 } 399 400 static void cm_free_msg(struct ib_mad_send_buf *msg) 401 { 402 if (msg->ah) 403 rdma_destroy_ah(msg->ah); 404 if (msg->context[0]) 405 cm_deref_id(msg->context[0]); 406 ib_free_send_mad(msg); 407 } 408 409 static int cm_alloc_response_msg(struct cm_port *port, 410 struct ib_mad_recv_wc *mad_recv_wc, 411 struct ib_mad_send_buf **msg) 412 { 413 struct ib_mad_send_buf *m; 414 int ret; 415 416 m = cm_alloc_response_msg_no_ah(port, mad_recv_wc); 417 if (IS_ERR(m)) 418 return PTR_ERR(m); 419 420 ret = cm_create_response_msg_ah(port, mad_recv_wc, m); 421 if (ret) { 422 cm_free_msg(m); 423 return ret; 424 } 425 426 *msg = m; 427 return 0; 428 } 429 430 static void * cm_copy_private_data(const void *private_data, 431 u8 private_data_len) 432 { 433 void *data; 434 435 if (!private_data || !private_data_len) 436 return NULL; 437 438 data = kmemdup(private_data, private_data_len, GFP_KERNEL); 439 if (!data) 440 return ERR_PTR(-ENOMEM); 441 442 return data; 443 } 444 445 static void cm_set_private_data(struct cm_id_private *cm_id_priv, 446 void *private_data, u8 private_data_len) 447 { 448 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 449 kfree(cm_id_priv->private_data); 450 451 cm_id_priv->private_data = private_data; 452 cm_id_priv->private_data_len = private_data_len; 453 } 454 455 static int cm_init_av_for_lap(struct cm_port *port, struct ib_wc *wc, 456 struct ib_grh *grh, struct cm_av *av) 457 { 458 struct rdma_ah_attr new_ah_attr; 459 int ret; 460 461 av->port = port; 462 av->pkey_index = wc->pkey_index; 463 464 /* 465 * av->ah_attr might be initialized based on past wc during incoming 466 * connect request or while sending out connect request. So initialize 467 * a new ah_attr on stack. If initialization fails, old ah_attr is 468 * used for sending any responses. If initialization is successful, 469 * than new ah_attr is used by overwriting old one. 470 */ 471 ret = ib_init_ah_attr_from_wc(port->cm_dev->ib_device, 472 port->port_num, wc, 473 grh, &new_ah_attr); 474 if (ret) 475 return ret; 476 477 memcpy(&av->ah_attr, &new_ah_attr, sizeof(new_ah_attr)); 478 return 0; 479 } 480 481 static int cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 482 struct ib_grh *grh, struct cm_av *av) 483 { 484 av->port = port; 485 av->pkey_index = wc->pkey_index; 486 return ib_init_ah_attr_from_wc(port->cm_dev->ib_device, 487 port->port_num, wc, 488 grh, &av->ah_attr); 489 } 490 491 static int add_cm_id_to_port_list(struct cm_id_private *cm_id_priv, 492 struct cm_av *av, 493 struct cm_port *port) 494 { 495 unsigned long flags; 496 int ret = 0; 497 498 spin_lock_irqsave(&cm.lock, flags); 499 500 if (&cm_id_priv->av == av) 501 list_add_tail(&cm_id_priv->prim_list, &port->cm_priv_prim_list); 502 else if (&cm_id_priv->alt_av == av) 503 list_add_tail(&cm_id_priv->altr_list, &port->cm_priv_altr_list); 504 else 505 ret = -EINVAL; 506 507 spin_unlock_irqrestore(&cm.lock, flags); 508 return ret; 509 } 510 511 static struct cm_port *get_cm_port_from_path(struct sa_path_rec *path) 512 { 513 struct cm_device *cm_dev; 514 struct cm_port *port = NULL; 515 unsigned long flags; 516 u8 p; 517 struct net_device *ndev = ib_get_ndev_from_path(path); 518 519 read_lock_irqsave(&cm.device_lock, flags); 520 list_for_each_entry(cm_dev, &cm.device_list, list) { 521 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid, 522 sa_conv_pathrec_to_gid_type(path), 523 ndev, &p, NULL)) { 524 port = cm_dev->port[p - 1]; 525 break; 526 } 527 } 528 read_unlock_irqrestore(&cm.device_lock, flags); 529 530 if (ndev) 531 dev_put(ndev); 532 return port; 533 } 534 535 static int cm_init_av_by_path(struct sa_path_rec *path, struct cm_av *av, 536 struct cm_id_private *cm_id_priv) 537 { 538 struct rdma_ah_attr new_ah_attr; 539 struct cm_device *cm_dev; 540 struct cm_port *port; 541 int ret; 542 543 port = get_cm_port_from_path(path); 544 if (!port) 545 return -EINVAL; 546 cm_dev = port->cm_dev; 547 548 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num, 549 be16_to_cpu(path->pkey), &av->pkey_index); 550 if (ret) 551 return ret; 552 553 av->port = port; 554 555 /* 556 * av->ah_attr might be initialized based on wc or during 557 * request processing time. So initialize a new ah_attr on stack. 558 * If initialization fails, old ah_attr is used for sending any 559 * responses. If initialization is successful, than new ah_attr 560 * is used by overwriting the old one. 561 */ 562 ret = ib_init_ah_attr_from_path(cm_dev->ib_device, port->port_num, path, 563 &new_ah_attr); 564 if (ret) 565 return ret; 566 567 av->timeout = path->packet_life_time + 1; 568 569 ret = add_cm_id_to_port_list(cm_id_priv, av, port); 570 if (ret) 571 return ret; 572 memcpy(&av->ah_attr, &new_ah_attr, sizeof(new_ah_attr)); 573 return 0; 574 } 575 576 static int cm_alloc_id(struct cm_id_private *cm_id_priv) 577 { 578 unsigned long flags; 579 int id; 580 581 idr_preload(GFP_KERNEL); 582 spin_lock_irqsave(&cm.lock, flags); 583 584 id = idr_alloc_cyclic(&cm.local_id_table, cm_id_priv, 0, 0, GFP_NOWAIT); 585 586 spin_unlock_irqrestore(&cm.lock, flags); 587 idr_preload_end(); 588 589 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand; 590 return id < 0 ? id : 0; 591 } 592 593 static void cm_free_id(__be32 local_id) 594 { 595 spin_lock_irq(&cm.lock); 596 idr_remove(&cm.local_id_table, 597 (__force int) (local_id ^ cm.random_id_operand)); 598 spin_unlock_irq(&cm.lock); 599 } 600 601 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id) 602 { 603 struct cm_id_private *cm_id_priv; 604 605 cm_id_priv = idr_find(&cm.local_id_table, 606 (__force int) (local_id ^ cm.random_id_operand)); 607 if (cm_id_priv) { 608 if (cm_id_priv->id.remote_id == remote_id) 609 atomic_inc(&cm_id_priv->refcount); 610 else 611 cm_id_priv = NULL; 612 } 613 614 return cm_id_priv; 615 } 616 617 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id) 618 { 619 struct cm_id_private *cm_id_priv; 620 621 spin_lock_irq(&cm.lock); 622 cm_id_priv = cm_get_id(local_id, remote_id); 623 spin_unlock_irq(&cm.lock); 624 625 return cm_id_priv; 626 } 627 628 /* 629 * Trivial helpers to strip endian annotation and compare; the 630 * endianness doesn't actually matter since we just need a stable 631 * order for the RB tree. 632 */ 633 static int be32_lt(__be32 a, __be32 b) 634 { 635 return (__force u32) a < (__force u32) b; 636 } 637 638 static int be32_gt(__be32 a, __be32 b) 639 { 640 return (__force u32) a > (__force u32) b; 641 } 642 643 static int be64_lt(__be64 a, __be64 b) 644 { 645 return (__force u64) a < (__force u64) b; 646 } 647 648 static int be64_gt(__be64 a, __be64 b) 649 { 650 return (__force u64) a > (__force u64) b; 651 } 652 653 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv) 654 { 655 struct rb_node **link = &cm.listen_service_table.rb_node; 656 struct rb_node *parent = NULL; 657 struct cm_id_private *cur_cm_id_priv; 658 __be64 service_id = cm_id_priv->id.service_id; 659 __be64 service_mask = cm_id_priv->id.service_mask; 660 661 while (*link) { 662 parent = *link; 663 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 664 service_node); 665 if ((cur_cm_id_priv->id.service_mask & service_id) == 666 (service_mask & cur_cm_id_priv->id.service_id) && 667 (cm_id_priv->id.device == cur_cm_id_priv->id.device)) 668 return cur_cm_id_priv; 669 670 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 671 link = &(*link)->rb_left; 672 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 673 link = &(*link)->rb_right; 674 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id)) 675 link = &(*link)->rb_left; 676 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id)) 677 link = &(*link)->rb_right; 678 else 679 link = &(*link)->rb_right; 680 } 681 rb_link_node(&cm_id_priv->service_node, parent, link); 682 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 683 return NULL; 684 } 685 686 static struct cm_id_private * cm_find_listen(struct ib_device *device, 687 __be64 service_id) 688 { 689 struct rb_node *node = cm.listen_service_table.rb_node; 690 struct cm_id_private *cm_id_priv; 691 692 while (node) { 693 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 694 if ((cm_id_priv->id.service_mask & service_id) == 695 cm_id_priv->id.service_id && 696 (cm_id_priv->id.device == device)) 697 return cm_id_priv; 698 699 if (device < cm_id_priv->id.device) 700 node = node->rb_left; 701 else if (device > cm_id_priv->id.device) 702 node = node->rb_right; 703 else if (be64_lt(service_id, cm_id_priv->id.service_id)) 704 node = node->rb_left; 705 else if (be64_gt(service_id, cm_id_priv->id.service_id)) 706 node = node->rb_right; 707 else 708 node = node->rb_right; 709 } 710 return NULL; 711 } 712 713 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info 714 *timewait_info) 715 { 716 struct rb_node **link = &cm.remote_id_table.rb_node; 717 struct rb_node *parent = NULL; 718 struct cm_timewait_info *cur_timewait_info; 719 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 720 __be32 remote_id = timewait_info->work.remote_id; 721 722 while (*link) { 723 parent = *link; 724 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 725 remote_id_node); 726 if (be32_lt(remote_id, cur_timewait_info->work.remote_id)) 727 link = &(*link)->rb_left; 728 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id)) 729 link = &(*link)->rb_right; 730 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 731 link = &(*link)->rb_left; 732 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 733 link = &(*link)->rb_right; 734 else 735 return cur_timewait_info; 736 } 737 timewait_info->inserted_remote_id = 1; 738 rb_link_node(&timewait_info->remote_id_node, parent, link); 739 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 740 return NULL; 741 } 742 743 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid, 744 __be32 remote_id) 745 { 746 struct rb_node *node = cm.remote_id_table.rb_node; 747 struct cm_timewait_info *timewait_info; 748 749 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 return timewait_info; 762 } 763 return NULL; 764 } 765 766 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info 767 *timewait_info) 768 { 769 struct rb_node **link = &cm.remote_qp_table.rb_node; 770 struct rb_node *parent = NULL; 771 struct cm_timewait_info *cur_timewait_info; 772 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 773 __be32 remote_qpn = timewait_info->remote_qpn; 774 775 while (*link) { 776 parent = *link; 777 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 778 remote_qp_node); 779 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn)) 780 link = &(*link)->rb_left; 781 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn)) 782 link = &(*link)->rb_right; 783 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 784 link = &(*link)->rb_left; 785 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 786 link = &(*link)->rb_right; 787 else 788 return cur_timewait_info; 789 } 790 timewait_info->inserted_remote_qp = 1; 791 rb_link_node(&timewait_info->remote_qp_node, parent, link); 792 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 793 return NULL; 794 } 795 796 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private 797 *cm_id_priv) 798 { 799 struct rb_node **link = &cm.remote_sidr_table.rb_node; 800 struct rb_node *parent = NULL; 801 struct cm_id_private *cur_cm_id_priv; 802 union ib_gid *port_gid = &cm_id_priv->av.dgid; 803 __be32 remote_id = cm_id_priv->id.remote_id; 804 805 while (*link) { 806 parent = *link; 807 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 808 sidr_id_node); 809 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id)) 810 link = &(*link)->rb_left; 811 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id)) 812 link = &(*link)->rb_right; 813 else { 814 int cmp; 815 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, 816 sizeof *port_gid); 817 if (cmp < 0) 818 link = &(*link)->rb_left; 819 else if (cmp > 0) 820 link = &(*link)->rb_right; 821 else 822 return cur_cm_id_priv; 823 } 824 } 825 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 826 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 827 return NULL; 828 } 829 830 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv, 831 enum ib_cm_sidr_status status) 832 { 833 struct ib_cm_sidr_rep_param param; 834 835 memset(¶m, 0, sizeof param); 836 param.status = status; 837 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m); 838 } 839 840 struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 841 ib_cm_handler cm_handler, 842 void *context) 843 { 844 struct cm_id_private *cm_id_priv; 845 int ret; 846 847 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 848 if (!cm_id_priv) 849 return ERR_PTR(-ENOMEM); 850 851 cm_id_priv->id.state = IB_CM_IDLE; 852 cm_id_priv->id.device = device; 853 cm_id_priv->id.cm_handler = cm_handler; 854 cm_id_priv->id.context = context; 855 cm_id_priv->id.remote_cm_qpn = 1; 856 ret = cm_alloc_id(cm_id_priv); 857 if (ret) 858 goto error; 859 860 spin_lock_init(&cm_id_priv->lock); 861 init_completion(&cm_id_priv->comp); 862 INIT_LIST_HEAD(&cm_id_priv->work_list); 863 INIT_LIST_HEAD(&cm_id_priv->prim_list); 864 INIT_LIST_HEAD(&cm_id_priv->altr_list); 865 atomic_set(&cm_id_priv->work_count, -1); 866 atomic_set(&cm_id_priv->refcount, 1); 867 return &cm_id_priv->id; 868 869 error: 870 kfree(cm_id_priv); 871 return ERR_PTR(-ENOMEM); 872 } 873 EXPORT_SYMBOL(ib_create_cm_id); 874 875 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 876 { 877 struct cm_work *work; 878 879 if (list_empty(&cm_id_priv->work_list)) 880 return NULL; 881 882 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 883 list_del(&work->list); 884 return work; 885 } 886 887 static void cm_free_work(struct cm_work *work) 888 { 889 if (work->mad_recv_wc) 890 ib_free_recv_mad(work->mad_recv_wc); 891 kfree(work); 892 } 893 894 static inline int cm_convert_to_ms(int iba_time) 895 { 896 /* approximate conversion to ms from 4.096us x 2^iba_time */ 897 return 1 << max(iba_time - 8, 0); 898 } 899 900 /* 901 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 902 * Because of how ack_timeout is stored, adding one doubles the timeout. 903 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 904 * increment it (round up) only if the other is within 50%. 905 */ 906 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 907 { 908 int ack_timeout = packet_life_time + 1; 909 910 if (ack_timeout >= ca_ack_delay) 911 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 912 else 913 ack_timeout = ca_ack_delay + 914 (ack_timeout >= (ca_ack_delay - 1)); 915 916 return min(31, ack_timeout); 917 } 918 919 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info) 920 { 921 if (timewait_info->inserted_remote_id) { 922 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 923 timewait_info->inserted_remote_id = 0; 924 } 925 926 if (timewait_info->inserted_remote_qp) { 927 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 928 timewait_info->inserted_remote_qp = 0; 929 } 930 } 931 932 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 933 { 934 struct cm_timewait_info *timewait_info; 935 936 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 937 if (!timewait_info) 938 return ERR_PTR(-ENOMEM); 939 940 timewait_info->work.local_id = local_id; 941 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 942 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 943 return timewait_info; 944 } 945 946 static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 947 { 948 int wait_time; 949 unsigned long flags; 950 struct cm_device *cm_dev; 951 952 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client); 953 if (!cm_dev) 954 return; 955 956 spin_lock_irqsave(&cm.lock, flags); 957 cm_cleanup_timewait(cm_id_priv->timewait_info); 958 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 959 spin_unlock_irqrestore(&cm.lock, flags); 960 961 /* 962 * The cm_id could be destroyed by the user before we exit timewait. 963 * To protect against this, we search for the cm_id after exiting 964 * timewait before notifying the user that we've exited timewait. 965 */ 966 cm_id_priv->id.state = IB_CM_TIMEWAIT; 967 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 968 969 /* Check if the device started its remove_one */ 970 spin_lock_irqsave(&cm.lock, flags); 971 if (!cm_dev->going_down) 972 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 973 msecs_to_jiffies(wait_time)); 974 spin_unlock_irqrestore(&cm.lock, flags); 975 976 cm_id_priv->timewait_info = NULL; 977 } 978 979 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 980 { 981 unsigned long flags; 982 983 cm_id_priv->id.state = IB_CM_IDLE; 984 if (cm_id_priv->timewait_info) { 985 spin_lock_irqsave(&cm.lock, flags); 986 cm_cleanup_timewait(cm_id_priv->timewait_info); 987 spin_unlock_irqrestore(&cm.lock, flags); 988 kfree(cm_id_priv->timewait_info); 989 cm_id_priv->timewait_info = NULL; 990 } 991 } 992 993 static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 994 { 995 struct cm_id_private *cm_id_priv; 996 struct cm_work *work; 997 998 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 999 retest: 1000 spin_lock_irq(&cm_id_priv->lock); 1001 switch (cm_id->state) { 1002 case IB_CM_LISTEN: 1003 spin_unlock_irq(&cm_id_priv->lock); 1004 1005 spin_lock_irq(&cm.lock); 1006 if (--cm_id_priv->listen_sharecount > 0) { 1007 /* The id is still shared. */ 1008 cm_deref_id(cm_id_priv); 1009 spin_unlock_irq(&cm.lock); 1010 return; 1011 } 1012 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 1013 spin_unlock_irq(&cm.lock); 1014 break; 1015 case IB_CM_SIDR_REQ_SENT: 1016 cm_id->state = IB_CM_IDLE; 1017 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1018 spin_unlock_irq(&cm_id_priv->lock); 1019 break; 1020 case IB_CM_SIDR_REQ_RCVD: 1021 spin_unlock_irq(&cm_id_priv->lock); 1022 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); 1023 spin_lock_irq(&cm.lock); 1024 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) 1025 rb_erase(&cm_id_priv->sidr_id_node, 1026 &cm.remote_sidr_table); 1027 spin_unlock_irq(&cm.lock); 1028 break; 1029 case IB_CM_REQ_SENT: 1030 case IB_CM_MRA_REQ_RCVD: 1031 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1032 spin_unlock_irq(&cm_id_priv->lock); 1033 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 1034 &cm_id_priv->id.device->node_guid, 1035 sizeof cm_id_priv->id.device->node_guid, 1036 NULL, 0); 1037 break; 1038 case IB_CM_REQ_RCVD: 1039 if (err == -ENOMEM) { 1040 /* Do not reject to allow future retries. */ 1041 cm_reset_to_idle(cm_id_priv); 1042 spin_unlock_irq(&cm_id_priv->lock); 1043 } else { 1044 spin_unlock_irq(&cm_id_priv->lock); 1045 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 1046 NULL, 0, NULL, 0); 1047 } 1048 break; 1049 case IB_CM_REP_SENT: 1050 case IB_CM_MRA_REP_RCVD: 1051 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1052 /* Fall through */ 1053 case IB_CM_MRA_REQ_SENT: 1054 case IB_CM_REP_RCVD: 1055 case IB_CM_MRA_REP_SENT: 1056 spin_unlock_irq(&cm_id_priv->lock); 1057 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 1058 NULL, 0, NULL, 0); 1059 break; 1060 case IB_CM_ESTABLISHED: 1061 spin_unlock_irq(&cm_id_priv->lock); 1062 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) 1063 break; 1064 ib_send_cm_dreq(cm_id, NULL, 0); 1065 goto retest; 1066 case IB_CM_DREQ_SENT: 1067 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1068 cm_enter_timewait(cm_id_priv); 1069 spin_unlock_irq(&cm_id_priv->lock); 1070 break; 1071 case IB_CM_DREQ_RCVD: 1072 spin_unlock_irq(&cm_id_priv->lock); 1073 ib_send_cm_drep(cm_id, NULL, 0); 1074 break; 1075 default: 1076 spin_unlock_irq(&cm_id_priv->lock); 1077 break; 1078 } 1079 1080 spin_lock_irq(&cm.lock); 1081 if (!list_empty(&cm_id_priv->altr_list) && 1082 (!cm_id_priv->altr_send_port_not_ready)) 1083 list_del(&cm_id_priv->altr_list); 1084 if (!list_empty(&cm_id_priv->prim_list) && 1085 (!cm_id_priv->prim_send_port_not_ready)) 1086 list_del(&cm_id_priv->prim_list); 1087 spin_unlock_irq(&cm.lock); 1088 1089 cm_free_id(cm_id->local_id); 1090 cm_deref_id(cm_id_priv); 1091 wait_for_completion(&cm_id_priv->comp); 1092 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 1093 cm_free_work(work); 1094 kfree(cm_id_priv->private_data); 1095 kfree(cm_id_priv); 1096 } 1097 1098 void ib_destroy_cm_id(struct ib_cm_id *cm_id) 1099 { 1100 cm_destroy_id(cm_id, 0); 1101 } 1102 EXPORT_SYMBOL(ib_destroy_cm_id); 1103 1104 /** 1105 * __ib_cm_listen - Initiates listening on the specified service ID for 1106 * connection and service ID resolution requests. 1107 * @cm_id: Connection identifier associated with the listen request. 1108 * @service_id: Service identifier matched against incoming connection 1109 * and service ID resolution requests. The service ID should be specified 1110 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1111 * assign a service ID to the caller. 1112 * @service_mask: Mask applied to service ID used to listen across a 1113 * range of service IDs. If set to 0, the service ID is matched 1114 * exactly. This parameter is ignored if %service_id is set to 1115 * IB_CM_ASSIGN_SERVICE_ID. 1116 */ 1117 static int __ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, 1118 __be64 service_mask) 1119 { 1120 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 1121 int ret = 0; 1122 1123 service_mask = service_mask ? service_mask : ~cpu_to_be64(0); 1124 service_id &= service_mask; 1125 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 1126 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 1127 return -EINVAL; 1128 1129 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1130 if (cm_id->state != IB_CM_IDLE) 1131 return -EINVAL; 1132 1133 cm_id->state = IB_CM_LISTEN; 1134 ++cm_id_priv->listen_sharecount; 1135 1136 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 1137 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 1138 cm_id->service_mask = ~cpu_to_be64(0); 1139 } else { 1140 cm_id->service_id = service_id; 1141 cm_id->service_mask = service_mask; 1142 } 1143 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 1144 1145 if (cur_cm_id_priv) { 1146 cm_id->state = IB_CM_IDLE; 1147 --cm_id_priv->listen_sharecount; 1148 ret = -EBUSY; 1149 } 1150 return ret; 1151 } 1152 1153 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask) 1154 { 1155 unsigned long flags; 1156 int ret; 1157 1158 spin_lock_irqsave(&cm.lock, flags); 1159 ret = __ib_cm_listen(cm_id, service_id, service_mask); 1160 spin_unlock_irqrestore(&cm.lock, flags); 1161 1162 return ret; 1163 } 1164 EXPORT_SYMBOL(ib_cm_listen); 1165 1166 /** 1167 * Create a new listening ib_cm_id and listen on the given service ID. 1168 * 1169 * If there's an existing ID listening on that same device and service ID, 1170 * return it. 1171 * 1172 * @device: Device associated with the cm_id. All related communication will 1173 * be associated with the specified device. 1174 * @cm_handler: Callback invoked to notify the user of CM events. 1175 * @service_id: Service identifier matched against incoming connection 1176 * and service ID resolution requests. The service ID should be specified 1177 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1178 * assign a service ID to the caller. 1179 * 1180 * Callers should call ib_destroy_cm_id when done with the listener ID. 1181 */ 1182 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device, 1183 ib_cm_handler cm_handler, 1184 __be64 service_id) 1185 { 1186 struct cm_id_private *cm_id_priv; 1187 struct ib_cm_id *cm_id; 1188 unsigned long flags; 1189 int err = 0; 1190 1191 /* Create an ID in advance, since the creation may sleep */ 1192 cm_id = ib_create_cm_id(device, cm_handler, NULL); 1193 if (IS_ERR(cm_id)) 1194 return cm_id; 1195 1196 spin_lock_irqsave(&cm.lock, flags); 1197 1198 if (service_id == IB_CM_ASSIGN_SERVICE_ID) 1199 goto new_id; 1200 1201 /* Find an existing ID */ 1202 cm_id_priv = cm_find_listen(device, service_id); 1203 if (cm_id_priv) { 1204 if (cm_id->cm_handler != cm_handler || cm_id->context) { 1205 /* Sharing an ib_cm_id with different handlers is not 1206 * supported */ 1207 spin_unlock_irqrestore(&cm.lock, flags); 1208 return ERR_PTR(-EINVAL); 1209 } 1210 atomic_inc(&cm_id_priv->refcount); 1211 ++cm_id_priv->listen_sharecount; 1212 spin_unlock_irqrestore(&cm.lock, flags); 1213 1214 ib_destroy_cm_id(cm_id); 1215 cm_id = &cm_id_priv->id; 1216 return cm_id; 1217 } 1218 1219 new_id: 1220 /* Use newly created ID */ 1221 err = __ib_cm_listen(cm_id, service_id, 0); 1222 1223 spin_unlock_irqrestore(&cm.lock, flags); 1224 1225 if (err) { 1226 ib_destroy_cm_id(cm_id); 1227 return ERR_PTR(err); 1228 } 1229 return cm_id; 1230 } 1231 EXPORT_SYMBOL(ib_cm_insert_listen); 1232 1233 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv, 1234 enum cm_msg_sequence msg_seq) 1235 { 1236 u64 hi_tid, low_tid; 1237 1238 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 1239 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id | 1240 (msg_seq << 30)); 1241 return cpu_to_be64(hi_tid | low_tid); 1242 } 1243 1244 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 1245 __be16 attr_id, __be64 tid) 1246 { 1247 hdr->base_version = IB_MGMT_BASE_VERSION; 1248 hdr->mgmt_class = IB_MGMT_CLASS_CM; 1249 hdr->class_version = IB_CM_CLASS_VERSION; 1250 hdr->method = IB_MGMT_METHOD_SEND; 1251 hdr->attr_id = attr_id; 1252 hdr->tid = tid; 1253 } 1254 1255 static void cm_format_req(struct cm_req_msg *req_msg, 1256 struct cm_id_private *cm_id_priv, 1257 struct ib_cm_req_param *param) 1258 { 1259 struct sa_path_rec *pri_path = param->primary_path; 1260 struct sa_path_rec *alt_path = param->alternate_path; 1261 bool pri_ext = false; 1262 1263 if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA) 1264 pri_ext = opa_is_extended_lid(pri_path->opa.dlid, 1265 pri_path->opa.slid); 1266 1267 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1268 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 1269 1270 req_msg->local_comm_id = cm_id_priv->id.local_id; 1271 req_msg->service_id = param->service_id; 1272 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1273 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 1274 cm_req_set_init_depth(req_msg, param->initiator_depth); 1275 cm_req_set_remote_resp_timeout(req_msg, 1276 param->remote_cm_response_timeout); 1277 cm_req_set_qp_type(req_msg, param->qp_type); 1278 cm_req_set_flow_ctrl(req_msg, param->flow_control); 1279 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 1280 cm_req_set_local_resp_timeout(req_msg, 1281 param->local_cm_response_timeout); 1282 req_msg->pkey = param->primary_path->pkey; 1283 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 1284 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 1285 1286 if (param->qp_type != IB_QPT_XRC_INI) { 1287 cm_req_set_resp_res(req_msg, param->responder_resources); 1288 cm_req_set_retry_count(req_msg, param->retry_count); 1289 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 1290 cm_req_set_srq(req_msg, param->srq); 1291 } 1292 1293 req_msg->primary_local_gid = pri_path->sgid; 1294 req_msg->primary_remote_gid = pri_path->dgid; 1295 if (pri_ext) { 1296 req_msg->primary_local_gid.global.interface_id 1297 = OPA_MAKE_ID(be32_to_cpu(pri_path->opa.slid)); 1298 req_msg->primary_remote_gid.global.interface_id 1299 = OPA_MAKE_ID(be32_to_cpu(pri_path->opa.dlid)); 1300 } 1301 if (pri_path->hop_limit <= 1) { 1302 req_msg->primary_local_lid = pri_ext ? 0 : 1303 htons(ntohl(sa_path_get_slid(pri_path))); 1304 req_msg->primary_remote_lid = pri_ext ? 0 : 1305 htons(ntohl(sa_path_get_dlid(pri_path))); 1306 } else { 1307 /* Work-around until there's a way to obtain remote LID info */ 1308 req_msg->primary_local_lid = IB_LID_PERMISSIVE; 1309 req_msg->primary_remote_lid = IB_LID_PERMISSIVE; 1310 } 1311 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label); 1312 cm_req_set_primary_packet_rate(req_msg, pri_path->rate); 1313 req_msg->primary_traffic_class = pri_path->traffic_class; 1314 req_msg->primary_hop_limit = pri_path->hop_limit; 1315 cm_req_set_primary_sl(req_msg, pri_path->sl); 1316 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1)); 1317 cm_req_set_primary_local_ack_timeout(req_msg, 1318 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1319 pri_path->packet_life_time)); 1320 1321 if (alt_path) { 1322 bool alt_ext = false; 1323 1324 if (alt_path->rec_type == SA_PATH_REC_TYPE_OPA) 1325 alt_ext = opa_is_extended_lid(alt_path->opa.dlid, 1326 alt_path->opa.slid); 1327 1328 req_msg->alt_local_gid = alt_path->sgid; 1329 req_msg->alt_remote_gid = alt_path->dgid; 1330 if (alt_ext) { 1331 req_msg->alt_local_gid.global.interface_id 1332 = OPA_MAKE_ID(be32_to_cpu(alt_path->opa.slid)); 1333 req_msg->alt_remote_gid.global.interface_id 1334 = OPA_MAKE_ID(be32_to_cpu(alt_path->opa.dlid)); 1335 } 1336 if (alt_path->hop_limit <= 1) { 1337 req_msg->alt_local_lid = alt_ext ? 0 : 1338 htons(ntohl(sa_path_get_slid(alt_path))); 1339 req_msg->alt_remote_lid = alt_ext ? 0 : 1340 htons(ntohl(sa_path_get_dlid(alt_path))); 1341 } else { 1342 req_msg->alt_local_lid = IB_LID_PERMISSIVE; 1343 req_msg->alt_remote_lid = IB_LID_PERMISSIVE; 1344 } 1345 cm_req_set_alt_flow_label(req_msg, 1346 alt_path->flow_label); 1347 cm_req_set_alt_packet_rate(req_msg, alt_path->rate); 1348 req_msg->alt_traffic_class = alt_path->traffic_class; 1349 req_msg->alt_hop_limit = alt_path->hop_limit; 1350 cm_req_set_alt_sl(req_msg, alt_path->sl); 1351 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1)); 1352 cm_req_set_alt_local_ack_timeout(req_msg, 1353 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1354 alt_path->packet_life_time)); 1355 } 1356 1357 if (param->private_data && param->private_data_len) 1358 memcpy(req_msg->private_data, param->private_data, 1359 param->private_data_len); 1360 } 1361 1362 static int cm_validate_req_param(struct ib_cm_req_param *param) 1363 { 1364 /* peer-to-peer not supported */ 1365 if (param->peer_to_peer) 1366 return -EINVAL; 1367 1368 if (!param->primary_path) 1369 return -EINVAL; 1370 1371 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC && 1372 param->qp_type != IB_QPT_XRC_INI) 1373 return -EINVAL; 1374 1375 if (param->private_data && 1376 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1377 return -EINVAL; 1378 1379 if (param->alternate_path && 1380 (param->alternate_path->pkey != param->primary_path->pkey || 1381 param->alternate_path->mtu != param->primary_path->mtu)) 1382 return -EINVAL; 1383 1384 return 0; 1385 } 1386 1387 int ib_send_cm_req(struct ib_cm_id *cm_id, 1388 struct ib_cm_req_param *param) 1389 { 1390 struct cm_id_private *cm_id_priv; 1391 struct cm_req_msg *req_msg; 1392 unsigned long flags; 1393 int ret; 1394 1395 ret = cm_validate_req_param(param); 1396 if (ret) 1397 return ret; 1398 1399 /* Verify that we're not in timewait. */ 1400 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1401 spin_lock_irqsave(&cm_id_priv->lock, flags); 1402 if (cm_id->state != IB_CM_IDLE) { 1403 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1404 ret = -EINVAL; 1405 goto out; 1406 } 1407 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1408 1409 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1410 id.local_id); 1411 if (IS_ERR(cm_id_priv->timewait_info)) { 1412 ret = PTR_ERR(cm_id_priv->timewait_info); 1413 goto out; 1414 } 1415 1416 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av, 1417 cm_id_priv); 1418 if (ret) 1419 goto error1; 1420 if (param->alternate_path) { 1421 ret = cm_init_av_by_path(param->alternate_path, 1422 &cm_id_priv->alt_av, cm_id_priv); 1423 if (ret) 1424 goto error1; 1425 } 1426 cm_id->service_id = param->service_id; 1427 cm_id->service_mask = ~cpu_to_be64(0); 1428 cm_id_priv->timeout_ms = cm_convert_to_ms( 1429 param->primary_path->packet_life_time) * 2 + 1430 cm_convert_to_ms( 1431 param->remote_cm_response_timeout); 1432 cm_id_priv->max_cm_retries = param->max_cm_retries; 1433 cm_id_priv->initiator_depth = param->initiator_depth; 1434 cm_id_priv->responder_resources = param->responder_resources; 1435 cm_id_priv->retry_count = param->retry_count; 1436 cm_id_priv->path_mtu = param->primary_path->mtu; 1437 cm_id_priv->pkey = param->primary_path->pkey; 1438 cm_id_priv->qp_type = param->qp_type; 1439 1440 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1441 if (ret) 1442 goto error1; 1443 1444 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1445 cm_format_req(req_msg, cm_id_priv, param); 1446 cm_id_priv->tid = req_msg->hdr.tid; 1447 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1448 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1449 1450 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1451 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1452 1453 spin_lock_irqsave(&cm_id_priv->lock, flags); 1454 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1455 if (ret) { 1456 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1457 goto error2; 1458 } 1459 BUG_ON(cm_id->state != IB_CM_IDLE); 1460 cm_id->state = IB_CM_REQ_SENT; 1461 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1462 return 0; 1463 1464 error2: cm_free_msg(cm_id_priv->msg); 1465 error1: kfree(cm_id_priv->timewait_info); 1466 out: return ret; 1467 } 1468 EXPORT_SYMBOL(ib_send_cm_req); 1469 1470 static int cm_issue_rej(struct cm_port *port, 1471 struct ib_mad_recv_wc *mad_recv_wc, 1472 enum ib_cm_rej_reason reason, 1473 enum cm_msg_response msg_rejected, 1474 void *ari, u8 ari_length) 1475 { 1476 struct ib_mad_send_buf *msg = NULL; 1477 struct cm_rej_msg *rej_msg, *rcv_msg; 1478 int ret; 1479 1480 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1481 if (ret) 1482 return ret; 1483 1484 /* We just need common CM header information. Cast to any message. */ 1485 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1486 rej_msg = (struct cm_rej_msg *) msg->mad; 1487 1488 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1489 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1490 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1491 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1492 rej_msg->reason = cpu_to_be16(reason); 1493 1494 if (ari && ari_length) { 1495 cm_rej_set_reject_info_len(rej_msg, ari_length); 1496 memcpy(rej_msg->ari, ari, ari_length); 1497 } 1498 1499 ret = ib_post_send_mad(msg, NULL); 1500 if (ret) 1501 cm_free_msg(msg); 1502 1503 return ret; 1504 } 1505 1506 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid, 1507 __be32 local_qpn, __be32 remote_qpn) 1508 { 1509 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) || 1510 ((local_ca_guid == remote_ca_guid) && 1511 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn)))); 1512 } 1513 1514 static bool cm_req_has_alt_path(struct cm_req_msg *req_msg) 1515 { 1516 return ((req_msg->alt_local_lid) || 1517 (ib_is_opa_gid(&req_msg->alt_local_gid))); 1518 } 1519 1520 static void cm_path_set_rec_type(struct ib_device *ib_device, u8 port_num, 1521 struct sa_path_rec *path, union ib_gid *gid) 1522 { 1523 if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num)) 1524 path->rec_type = SA_PATH_REC_TYPE_OPA; 1525 else 1526 path->rec_type = SA_PATH_REC_TYPE_IB; 1527 } 1528 1529 static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg, 1530 struct sa_path_rec *primary_path, 1531 struct sa_path_rec *alt_path) 1532 { 1533 u32 lid; 1534 1535 if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) { 1536 sa_path_set_dlid(primary_path, 1537 ntohs(req_msg->primary_local_lid)); 1538 sa_path_set_slid(primary_path, 1539 ntohs(req_msg->primary_remote_lid)); 1540 } else { 1541 lid = opa_get_lid_from_gid(&req_msg->primary_local_gid); 1542 sa_path_set_dlid(primary_path, lid); 1543 1544 lid = opa_get_lid_from_gid(&req_msg->primary_remote_gid); 1545 sa_path_set_slid(primary_path, lid); 1546 } 1547 1548 if (!cm_req_has_alt_path(req_msg)) 1549 return; 1550 1551 if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) { 1552 sa_path_set_dlid(alt_path, ntohs(req_msg->alt_local_lid)); 1553 sa_path_set_slid(alt_path, ntohs(req_msg->alt_remote_lid)); 1554 } else { 1555 lid = opa_get_lid_from_gid(&req_msg->alt_local_gid); 1556 sa_path_set_dlid(alt_path, lid); 1557 1558 lid = opa_get_lid_from_gid(&req_msg->alt_remote_gid); 1559 sa_path_set_slid(alt_path, lid); 1560 } 1561 } 1562 1563 static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1564 struct sa_path_rec *primary_path, 1565 struct sa_path_rec *alt_path) 1566 { 1567 primary_path->dgid = req_msg->primary_local_gid; 1568 primary_path->sgid = req_msg->primary_remote_gid; 1569 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1570 primary_path->hop_limit = req_msg->primary_hop_limit; 1571 primary_path->traffic_class = req_msg->primary_traffic_class; 1572 primary_path->reversible = 1; 1573 primary_path->pkey = req_msg->pkey; 1574 primary_path->sl = cm_req_get_primary_sl(req_msg); 1575 primary_path->mtu_selector = IB_SA_EQ; 1576 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1577 primary_path->rate_selector = IB_SA_EQ; 1578 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1579 primary_path->packet_life_time_selector = IB_SA_EQ; 1580 primary_path->packet_life_time = 1581 cm_req_get_primary_local_ack_timeout(req_msg); 1582 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1583 primary_path->service_id = req_msg->service_id; 1584 if (sa_path_is_roce(primary_path)) 1585 primary_path->roce.route_resolved = false; 1586 1587 if (cm_req_has_alt_path(req_msg)) { 1588 alt_path->dgid = req_msg->alt_local_gid; 1589 alt_path->sgid = req_msg->alt_remote_gid; 1590 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1591 alt_path->hop_limit = req_msg->alt_hop_limit; 1592 alt_path->traffic_class = req_msg->alt_traffic_class; 1593 alt_path->reversible = 1; 1594 alt_path->pkey = req_msg->pkey; 1595 alt_path->sl = cm_req_get_alt_sl(req_msg); 1596 alt_path->mtu_selector = IB_SA_EQ; 1597 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1598 alt_path->rate_selector = IB_SA_EQ; 1599 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1600 alt_path->packet_life_time_selector = IB_SA_EQ; 1601 alt_path->packet_life_time = 1602 cm_req_get_alt_local_ack_timeout(req_msg); 1603 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1604 alt_path->service_id = req_msg->service_id; 1605 1606 if (sa_path_is_roce(alt_path)) 1607 alt_path->roce.route_resolved = false; 1608 } 1609 cm_format_path_lid_from_req(req_msg, primary_path, alt_path); 1610 } 1611 1612 static u16 cm_get_bth_pkey(struct cm_work *work) 1613 { 1614 struct ib_device *ib_dev = work->port->cm_dev->ib_device; 1615 u8 port_num = work->port->port_num; 1616 u16 pkey_index = work->mad_recv_wc->wc->pkey_index; 1617 u16 pkey; 1618 int ret; 1619 1620 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey); 1621 if (ret) { 1622 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n", 1623 port_num, pkey_index, ret); 1624 return 0; 1625 } 1626 1627 return pkey; 1628 } 1629 1630 /** 1631 * Convert OPA SGID to IB SGID 1632 * ULPs (such as IPoIB) do not understand OPA GIDs and will 1633 * reject them as the local_gid will not match the sgid. Therefore, 1634 * change the pathrec's SGID to an IB SGID. 1635 * 1636 * @work: Work completion 1637 * @path: Path record 1638 */ 1639 static void cm_opa_to_ib_sgid(struct cm_work *work, 1640 struct sa_path_rec *path) 1641 { 1642 struct ib_device *dev = work->port->cm_dev->ib_device; 1643 u8 port_num = work->port->port_num; 1644 1645 if (rdma_cap_opa_ah(dev, port_num) && 1646 (ib_is_opa_gid(&path->sgid))) { 1647 union ib_gid sgid; 1648 1649 if (ib_get_cached_gid(dev, port_num, 0, &sgid, NULL)) { 1650 dev_warn(&dev->dev, 1651 "Error updating sgid in CM request\n"); 1652 return; 1653 } 1654 1655 path->sgid = sgid; 1656 } 1657 } 1658 1659 static void cm_format_req_event(struct cm_work *work, 1660 struct cm_id_private *cm_id_priv, 1661 struct ib_cm_id *listen_id) 1662 { 1663 struct cm_req_msg *req_msg; 1664 struct ib_cm_req_event_param *param; 1665 1666 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1667 param = &work->cm_event.param.req_rcvd; 1668 param->listen_id = listen_id; 1669 param->bth_pkey = cm_get_bth_pkey(work); 1670 param->port = cm_id_priv->av.port->port_num; 1671 param->primary_path = &work->path[0]; 1672 cm_opa_to_ib_sgid(work, param->primary_path); 1673 if (cm_req_has_alt_path(req_msg)) { 1674 param->alternate_path = &work->path[1]; 1675 cm_opa_to_ib_sgid(work, param->alternate_path); 1676 } else { 1677 param->alternate_path = NULL; 1678 } 1679 param->remote_ca_guid = req_msg->local_ca_guid; 1680 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1681 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1682 param->qp_type = cm_req_get_qp_type(req_msg); 1683 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1684 param->responder_resources = cm_req_get_init_depth(req_msg); 1685 param->initiator_depth = cm_req_get_resp_res(req_msg); 1686 param->local_cm_response_timeout = 1687 cm_req_get_remote_resp_timeout(req_msg); 1688 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1689 param->remote_cm_response_timeout = 1690 cm_req_get_local_resp_timeout(req_msg); 1691 param->retry_count = cm_req_get_retry_count(req_msg); 1692 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1693 param->srq = cm_req_get_srq(req_msg); 1694 work->cm_event.private_data = &req_msg->private_data; 1695 } 1696 1697 static void cm_process_work(struct cm_id_private *cm_id_priv, 1698 struct cm_work *work) 1699 { 1700 int ret; 1701 1702 /* We will typically only have the current event to report. */ 1703 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1704 cm_free_work(work); 1705 1706 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1707 spin_lock_irq(&cm_id_priv->lock); 1708 work = cm_dequeue_work(cm_id_priv); 1709 spin_unlock_irq(&cm_id_priv->lock); 1710 if (!work) 1711 return; 1712 1713 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1714 &work->cm_event); 1715 cm_free_work(work); 1716 } 1717 cm_deref_id(cm_id_priv); 1718 if (ret) 1719 cm_destroy_id(&cm_id_priv->id, ret); 1720 } 1721 1722 static void cm_format_mra(struct cm_mra_msg *mra_msg, 1723 struct cm_id_private *cm_id_priv, 1724 enum cm_msg_response msg_mraed, u8 service_timeout, 1725 const void *private_data, u8 private_data_len) 1726 { 1727 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1728 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1729 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1730 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1731 cm_mra_set_service_timeout(mra_msg, service_timeout); 1732 1733 if (private_data && private_data_len) 1734 memcpy(mra_msg->private_data, private_data, private_data_len); 1735 } 1736 1737 static void cm_format_rej(struct cm_rej_msg *rej_msg, 1738 struct cm_id_private *cm_id_priv, 1739 enum ib_cm_rej_reason reason, 1740 void *ari, 1741 u8 ari_length, 1742 const void *private_data, 1743 u8 private_data_len) 1744 { 1745 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1746 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1747 1748 switch(cm_id_priv->id.state) { 1749 case IB_CM_REQ_RCVD: 1750 rej_msg->local_comm_id = 0; 1751 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1752 break; 1753 case IB_CM_MRA_REQ_SENT: 1754 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1755 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1756 break; 1757 case IB_CM_REP_RCVD: 1758 case IB_CM_MRA_REP_SENT: 1759 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1760 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1761 break; 1762 default: 1763 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1764 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1765 break; 1766 } 1767 1768 rej_msg->reason = cpu_to_be16(reason); 1769 if (ari && ari_length) { 1770 cm_rej_set_reject_info_len(rej_msg, ari_length); 1771 memcpy(rej_msg->ari, ari, ari_length); 1772 } 1773 1774 if (private_data && private_data_len) 1775 memcpy(rej_msg->private_data, private_data, private_data_len); 1776 } 1777 1778 static void cm_dup_req_handler(struct cm_work *work, 1779 struct cm_id_private *cm_id_priv) 1780 { 1781 struct ib_mad_send_buf *msg = NULL; 1782 int ret; 1783 1784 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1785 counter[CM_REQ_COUNTER]); 1786 1787 /* Quick state check to discard duplicate REQs. */ 1788 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1789 return; 1790 1791 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1792 if (ret) 1793 return; 1794 1795 spin_lock_irq(&cm_id_priv->lock); 1796 switch (cm_id_priv->id.state) { 1797 case IB_CM_MRA_REQ_SENT: 1798 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1799 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1800 cm_id_priv->private_data, 1801 cm_id_priv->private_data_len); 1802 break; 1803 case IB_CM_TIMEWAIT: 1804 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1805 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1806 break; 1807 default: 1808 goto unlock; 1809 } 1810 spin_unlock_irq(&cm_id_priv->lock); 1811 1812 ret = ib_post_send_mad(msg, NULL); 1813 if (ret) 1814 goto free; 1815 return; 1816 1817 unlock: spin_unlock_irq(&cm_id_priv->lock); 1818 free: cm_free_msg(msg); 1819 } 1820 1821 static struct cm_id_private * cm_match_req(struct cm_work *work, 1822 struct cm_id_private *cm_id_priv) 1823 { 1824 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1825 struct cm_timewait_info *timewait_info; 1826 struct cm_req_msg *req_msg; 1827 struct ib_cm_id *cm_id; 1828 1829 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1830 1831 /* Check for possible duplicate REQ. */ 1832 spin_lock_irq(&cm.lock); 1833 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1834 if (timewait_info) { 1835 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1836 timewait_info->work.remote_id); 1837 spin_unlock_irq(&cm.lock); 1838 if (cur_cm_id_priv) { 1839 cm_dup_req_handler(work, cur_cm_id_priv); 1840 cm_deref_id(cur_cm_id_priv); 1841 } 1842 return NULL; 1843 } 1844 1845 /* Check for stale connections. */ 1846 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1847 if (timewait_info) { 1848 cm_cleanup_timewait(cm_id_priv->timewait_info); 1849 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1850 timewait_info->work.remote_id); 1851 1852 spin_unlock_irq(&cm.lock); 1853 cm_issue_rej(work->port, work->mad_recv_wc, 1854 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1855 NULL, 0); 1856 if (cur_cm_id_priv) { 1857 cm_id = &cur_cm_id_priv->id; 1858 ib_send_cm_dreq(cm_id, NULL, 0); 1859 cm_deref_id(cur_cm_id_priv); 1860 } 1861 return NULL; 1862 } 1863 1864 /* Find matching listen request. */ 1865 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1866 req_msg->service_id); 1867 if (!listen_cm_id_priv) { 1868 cm_cleanup_timewait(cm_id_priv->timewait_info); 1869 spin_unlock_irq(&cm.lock); 1870 cm_issue_rej(work->port, work->mad_recv_wc, 1871 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1872 NULL, 0); 1873 goto out; 1874 } 1875 atomic_inc(&listen_cm_id_priv->refcount); 1876 atomic_inc(&cm_id_priv->refcount); 1877 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1878 atomic_inc(&cm_id_priv->work_count); 1879 spin_unlock_irq(&cm.lock); 1880 out: 1881 return listen_cm_id_priv; 1882 } 1883 1884 /* 1885 * Work-around for inter-subnet connections. If the LIDs are permissive, 1886 * we need to override the LID/SL data in the REQ with the LID information 1887 * in the work completion. 1888 */ 1889 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 1890 { 1891 if (!cm_req_get_primary_subnet_local(req_msg)) { 1892 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) { 1893 req_msg->primary_local_lid = ib_lid_be16(wc->slid); 1894 cm_req_set_primary_sl(req_msg, wc->sl); 1895 } 1896 1897 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE) 1898 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1899 } 1900 1901 if (!cm_req_get_alt_subnet_local(req_msg)) { 1902 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) { 1903 req_msg->alt_local_lid = ib_lid_be16(wc->slid); 1904 cm_req_set_alt_sl(req_msg, wc->sl); 1905 } 1906 1907 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE) 1908 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1909 } 1910 } 1911 1912 static int cm_req_handler(struct cm_work *work) 1913 { 1914 struct ib_cm_id *cm_id; 1915 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1916 struct cm_req_msg *req_msg; 1917 union ib_gid gid; 1918 struct ib_gid_attr gid_attr; 1919 const struct ib_global_route *grh; 1920 int ret; 1921 1922 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1923 1924 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 1925 if (IS_ERR(cm_id)) 1926 return PTR_ERR(cm_id); 1927 1928 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1929 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1930 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1931 work->mad_recv_wc->recv_buf.grh, 1932 &cm_id_priv->av); 1933 if (ret) 1934 goto destroy; 1935 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1936 id.local_id); 1937 if (IS_ERR(cm_id_priv->timewait_info)) { 1938 ret = PTR_ERR(cm_id_priv->timewait_info); 1939 goto destroy; 1940 } 1941 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1942 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1943 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1944 1945 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1946 if (!listen_cm_id_priv) { 1947 pr_debug("%s: local_id %d, no listen_cm_id_priv\n", __func__, 1948 be32_to_cpu(cm_id->local_id)); 1949 ret = -EINVAL; 1950 goto free_timeinfo; 1951 } 1952 1953 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1954 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1955 cm_id_priv->id.service_id = req_msg->service_id; 1956 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 1957 1958 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 1959 1960 memset(&work->path[0], 0, sizeof(work->path[0])); 1961 if (cm_req_has_alt_path(req_msg)) 1962 memset(&work->path[1], 0, sizeof(work->path[1])); 1963 grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr); 1964 ret = ib_get_cached_gid(work->port->cm_dev->ib_device, 1965 work->port->port_num, 1966 grh->sgid_index, 1967 &gid, &gid_attr); 1968 if (ret) { 1969 ib_send_cm_rej(cm_id, IB_CM_REJ_UNSUPPORTED, NULL, 0, NULL, 0); 1970 goto rejected; 1971 } 1972 1973 if (gid_attr.ndev) { 1974 work->path[0].rec_type = 1975 sa_conv_gid_to_pathrec_type(gid_attr.gid_type); 1976 sa_path_set_ifindex(&work->path[0], 1977 gid_attr.ndev->ifindex); 1978 sa_path_set_ndev(&work->path[0], 1979 dev_net(gid_attr.ndev)); 1980 dev_put(gid_attr.ndev); 1981 } else { 1982 cm_path_set_rec_type(work->port->cm_dev->ib_device, 1983 work->port->port_num, 1984 &work->path[0], 1985 &req_msg->primary_local_gid); 1986 } 1987 if (cm_req_has_alt_path(req_msg)) 1988 work->path[1].rec_type = work->path[0].rec_type; 1989 cm_format_paths_from_req(req_msg, &work->path[0], 1990 &work->path[1]); 1991 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE) 1992 sa_path_set_dmac(&work->path[0], 1993 cm_id_priv->av.ah_attr.roce.dmac); 1994 work->path[0].hop_limit = grh->hop_limit; 1995 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av, 1996 cm_id_priv); 1997 if (ret) { 1998 int err; 1999 2000 err = ib_get_cached_gid(work->port->cm_dev->ib_device, 2001 work->port->port_num, 0, 2002 &work->path[0].sgid, 2003 NULL); 2004 if (err) 2005 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 2006 NULL, 0, NULL, 0); 2007 else 2008 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 2009 &work->path[0].sgid, 2010 sizeof(work->path[0].sgid), 2011 NULL, 0); 2012 goto rejected; 2013 } 2014 if (cm_req_has_alt_path(req_msg)) { 2015 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av, 2016 cm_id_priv); 2017 if (ret) { 2018 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID, 2019 &work->path[0].sgid, 2020 sizeof(work->path[0].sgid), NULL, 0); 2021 goto rejected; 2022 } 2023 } 2024 cm_id_priv->tid = req_msg->hdr.tid; 2025 cm_id_priv->timeout_ms = cm_convert_to_ms( 2026 cm_req_get_local_resp_timeout(req_msg)); 2027 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 2028 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 2029 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 2030 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 2031 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 2032 cm_id_priv->pkey = req_msg->pkey; 2033 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 2034 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 2035 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 2036 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 2037 2038 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 2039 cm_process_work(cm_id_priv, work); 2040 cm_deref_id(listen_cm_id_priv); 2041 return 0; 2042 2043 rejected: 2044 atomic_dec(&cm_id_priv->refcount); 2045 cm_deref_id(listen_cm_id_priv); 2046 free_timeinfo: 2047 kfree(cm_id_priv->timewait_info); 2048 destroy: 2049 ib_destroy_cm_id(cm_id); 2050 return ret; 2051 } 2052 2053 static void cm_format_rep(struct cm_rep_msg *rep_msg, 2054 struct cm_id_private *cm_id_priv, 2055 struct ib_cm_rep_param *param) 2056 { 2057 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 2058 rep_msg->local_comm_id = cm_id_priv->id.local_id; 2059 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 2060 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 2061 rep_msg->resp_resources = param->responder_resources; 2062 cm_rep_set_target_ack_delay(rep_msg, 2063 cm_id_priv->av.port->cm_dev->ack_delay); 2064 cm_rep_set_failover(rep_msg, param->failover_accepted); 2065 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 2066 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 2067 2068 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) { 2069 rep_msg->initiator_depth = param->initiator_depth; 2070 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 2071 cm_rep_set_srq(rep_msg, param->srq); 2072 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 2073 } else { 2074 cm_rep_set_srq(rep_msg, 1); 2075 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num)); 2076 } 2077 2078 if (param->private_data && param->private_data_len) 2079 memcpy(rep_msg->private_data, param->private_data, 2080 param->private_data_len); 2081 } 2082 2083 int ib_send_cm_rep(struct ib_cm_id *cm_id, 2084 struct ib_cm_rep_param *param) 2085 { 2086 struct cm_id_private *cm_id_priv; 2087 struct ib_mad_send_buf *msg; 2088 struct cm_rep_msg *rep_msg; 2089 unsigned long flags; 2090 int ret; 2091 2092 if (param->private_data && 2093 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 2094 return -EINVAL; 2095 2096 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2097 spin_lock_irqsave(&cm_id_priv->lock, flags); 2098 if (cm_id->state != IB_CM_REQ_RCVD && 2099 cm_id->state != IB_CM_MRA_REQ_SENT) { 2100 pr_debug("%s: local_comm_id %d, cm_id->state: %d\n", __func__, 2101 be32_to_cpu(cm_id_priv->id.local_id), cm_id->state); 2102 ret = -EINVAL; 2103 goto out; 2104 } 2105 2106 ret = cm_alloc_msg(cm_id_priv, &msg); 2107 if (ret) 2108 goto out; 2109 2110 rep_msg = (struct cm_rep_msg *) msg->mad; 2111 cm_format_rep(rep_msg, cm_id_priv, param); 2112 msg->timeout_ms = cm_id_priv->timeout_ms; 2113 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 2114 2115 ret = ib_post_send_mad(msg, NULL); 2116 if (ret) { 2117 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2118 cm_free_msg(msg); 2119 return ret; 2120 } 2121 2122 cm_id->state = IB_CM_REP_SENT; 2123 cm_id_priv->msg = msg; 2124 cm_id_priv->initiator_depth = param->initiator_depth; 2125 cm_id_priv->responder_resources = param->responder_resources; 2126 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 2127 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF); 2128 2129 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2130 return ret; 2131 } 2132 EXPORT_SYMBOL(ib_send_cm_rep); 2133 2134 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 2135 struct cm_id_private *cm_id_priv, 2136 const void *private_data, 2137 u8 private_data_len) 2138 { 2139 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 2140 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 2141 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 2142 2143 if (private_data && private_data_len) 2144 memcpy(rtu_msg->private_data, private_data, private_data_len); 2145 } 2146 2147 int ib_send_cm_rtu(struct ib_cm_id *cm_id, 2148 const void *private_data, 2149 u8 private_data_len) 2150 { 2151 struct cm_id_private *cm_id_priv; 2152 struct ib_mad_send_buf *msg; 2153 unsigned long flags; 2154 void *data; 2155 int ret; 2156 2157 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 2158 return -EINVAL; 2159 2160 data = cm_copy_private_data(private_data, private_data_len); 2161 if (IS_ERR(data)) 2162 return PTR_ERR(data); 2163 2164 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2165 spin_lock_irqsave(&cm_id_priv->lock, flags); 2166 if (cm_id->state != IB_CM_REP_RCVD && 2167 cm_id->state != IB_CM_MRA_REP_SENT) { 2168 pr_debug("%s: local_id %d, cm_id->state %d\n", __func__, 2169 be32_to_cpu(cm_id->local_id), cm_id->state); 2170 ret = -EINVAL; 2171 goto error; 2172 } 2173 2174 ret = cm_alloc_msg(cm_id_priv, &msg); 2175 if (ret) 2176 goto error; 2177 2178 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 2179 private_data, private_data_len); 2180 2181 ret = ib_post_send_mad(msg, NULL); 2182 if (ret) { 2183 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2184 cm_free_msg(msg); 2185 kfree(data); 2186 return ret; 2187 } 2188 2189 cm_id->state = IB_CM_ESTABLISHED; 2190 cm_set_private_data(cm_id_priv, data, private_data_len); 2191 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2192 return 0; 2193 2194 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2195 kfree(data); 2196 return ret; 2197 } 2198 EXPORT_SYMBOL(ib_send_cm_rtu); 2199 2200 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type) 2201 { 2202 struct cm_rep_msg *rep_msg; 2203 struct ib_cm_rep_event_param *param; 2204 2205 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 2206 param = &work->cm_event.param.rep_rcvd; 2207 param->remote_ca_guid = rep_msg->local_ca_guid; 2208 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 2209 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type)); 2210 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 2211 param->responder_resources = rep_msg->initiator_depth; 2212 param->initiator_depth = rep_msg->resp_resources; 2213 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 2214 param->failover_accepted = cm_rep_get_failover(rep_msg); 2215 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 2216 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 2217 param->srq = cm_rep_get_srq(rep_msg); 2218 work->cm_event.private_data = &rep_msg->private_data; 2219 } 2220 2221 static void cm_dup_rep_handler(struct cm_work *work) 2222 { 2223 struct cm_id_private *cm_id_priv; 2224 struct cm_rep_msg *rep_msg; 2225 struct ib_mad_send_buf *msg = NULL; 2226 int ret; 2227 2228 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 2229 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 2230 rep_msg->local_comm_id); 2231 if (!cm_id_priv) 2232 return; 2233 2234 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2235 counter[CM_REP_COUNTER]); 2236 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 2237 if (ret) 2238 goto deref; 2239 2240 spin_lock_irq(&cm_id_priv->lock); 2241 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 2242 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 2243 cm_id_priv->private_data, 2244 cm_id_priv->private_data_len); 2245 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 2246 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2247 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 2248 cm_id_priv->private_data, 2249 cm_id_priv->private_data_len); 2250 else 2251 goto unlock; 2252 spin_unlock_irq(&cm_id_priv->lock); 2253 2254 ret = ib_post_send_mad(msg, NULL); 2255 if (ret) 2256 goto free; 2257 goto deref; 2258 2259 unlock: spin_unlock_irq(&cm_id_priv->lock); 2260 free: cm_free_msg(msg); 2261 deref: cm_deref_id(cm_id_priv); 2262 } 2263 2264 static int cm_rep_handler(struct cm_work *work) 2265 { 2266 struct cm_id_private *cm_id_priv; 2267 struct cm_rep_msg *rep_msg; 2268 int ret; 2269 struct cm_id_private *cur_cm_id_priv; 2270 struct ib_cm_id *cm_id; 2271 struct cm_timewait_info *timewait_info; 2272 2273 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 2274 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 2275 if (!cm_id_priv) { 2276 cm_dup_rep_handler(work); 2277 pr_debug("%s: remote_comm_id %d, no cm_id_priv\n", __func__, 2278 be32_to_cpu(rep_msg->remote_comm_id)); 2279 return -EINVAL; 2280 } 2281 2282 cm_format_rep_event(work, cm_id_priv->qp_type); 2283 2284 spin_lock_irq(&cm_id_priv->lock); 2285 switch (cm_id_priv->id.state) { 2286 case IB_CM_REQ_SENT: 2287 case IB_CM_MRA_REQ_RCVD: 2288 break; 2289 default: 2290 spin_unlock_irq(&cm_id_priv->lock); 2291 ret = -EINVAL; 2292 pr_debug("%s: cm_id_priv->id.state: %d, local_comm_id %d, remote_comm_id %d\n", 2293 __func__, cm_id_priv->id.state, 2294 be32_to_cpu(rep_msg->local_comm_id), 2295 be32_to_cpu(rep_msg->remote_comm_id)); 2296 goto error; 2297 } 2298 2299 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 2300 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 2301 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2302 2303 spin_lock(&cm.lock); 2304 /* Check for duplicate REP. */ 2305 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 2306 spin_unlock(&cm.lock); 2307 spin_unlock_irq(&cm_id_priv->lock); 2308 ret = -EINVAL; 2309 pr_debug("%s: Failed to insert remote id %d\n", __func__, 2310 be32_to_cpu(rep_msg->remote_comm_id)); 2311 goto error; 2312 } 2313 /* Check for a stale connection. */ 2314 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 2315 if (timewait_info) { 2316 rb_erase(&cm_id_priv->timewait_info->remote_id_node, 2317 &cm.remote_id_table); 2318 cm_id_priv->timewait_info->inserted_remote_id = 0; 2319 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 2320 timewait_info->work.remote_id); 2321 2322 spin_unlock(&cm.lock); 2323 spin_unlock_irq(&cm_id_priv->lock); 2324 cm_issue_rej(work->port, work->mad_recv_wc, 2325 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 2326 NULL, 0); 2327 ret = -EINVAL; 2328 pr_debug("%s: Stale connection. local_comm_id %d, remote_comm_id %d\n", 2329 __func__, be32_to_cpu(rep_msg->local_comm_id), 2330 be32_to_cpu(rep_msg->remote_comm_id)); 2331 2332 if (cur_cm_id_priv) { 2333 cm_id = &cur_cm_id_priv->id; 2334 ib_send_cm_dreq(cm_id, NULL, 0); 2335 cm_deref_id(cur_cm_id_priv); 2336 } 2337 2338 goto error; 2339 } 2340 spin_unlock(&cm.lock); 2341 2342 cm_id_priv->id.state = IB_CM_REP_RCVD; 2343 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 2344 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2345 cm_id_priv->initiator_depth = rep_msg->resp_resources; 2346 cm_id_priv->responder_resources = rep_msg->initiator_depth; 2347 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 2348 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 2349 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 2350 cm_id_priv->av.timeout = 2351 cm_ack_timeout(cm_id_priv->target_ack_delay, 2352 cm_id_priv->av.timeout - 1); 2353 cm_id_priv->alt_av.timeout = 2354 cm_ack_timeout(cm_id_priv->target_ack_delay, 2355 cm_id_priv->alt_av.timeout - 1); 2356 2357 /* todo: handle peer_to_peer */ 2358 2359 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2360 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2361 if (!ret) 2362 list_add_tail(&work->list, &cm_id_priv->work_list); 2363 spin_unlock_irq(&cm_id_priv->lock); 2364 2365 if (ret) 2366 cm_process_work(cm_id_priv, work); 2367 else 2368 cm_deref_id(cm_id_priv); 2369 return 0; 2370 2371 error: 2372 cm_deref_id(cm_id_priv); 2373 return ret; 2374 } 2375 2376 static int cm_establish_handler(struct cm_work *work) 2377 { 2378 struct cm_id_private *cm_id_priv; 2379 int ret; 2380 2381 /* See comment in cm_establish about lookup. */ 2382 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 2383 if (!cm_id_priv) 2384 return -EINVAL; 2385 2386 spin_lock_irq(&cm_id_priv->lock); 2387 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 2388 spin_unlock_irq(&cm_id_priv->lock); 2389 goto out; 2390 } 2391 2392 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2393 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2394 if (!ret) 2395 list_add_tail(&work->list, &cm_id_priv->work_list); 2396 spin_unlock_irq(&cm_id_priv->lock); 2397 2398 if (ret) 2399 cm_process_work(cm_id_priv, work); 2400 else 2401 cm_deref_id(cm_id_priv); 2402 return 0; 2403 out: 2404 cm_deref_id(cm_id_priv); 2405 return -EINVAL; 2406 } 2407 2408 static int cm_rtu_handler(struct cm_work *work) 2409 { 2410 struct cm_id_private *cm_id_priv; 2411 struct cm_rtu_msg *rtu_msg; 2412 int ret; 2413 2414 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 2415 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 2416 rtu_msg->local_comm_id); 2417 if (!cm_id_priv) 2418 return -EINVAL; 2419 2420 work->cm_event.private_data = &rtu_msg->private_data; 2421 2422 spin_lock_irq(&cm_id_priv->lock); 2423 if (cm_id_priv->id.state != IB_CM_REP_SENT && 2424 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 2425 spin_unlock_irq(&cm_id_priv->lock); 2426 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2427 counter[CM_RTU_COUNTER]); 2428 goto out; 2429 } 2430 cm_id_priv->id.state = IB_CM_ESTABLISHED; 2431 2432 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2433 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2434 if (!ret) 2435 list_add_tail(&work->list, &cm_id_priv->work_list); 2436 spin_unlock_irq(&cm_id_priv->lock); 2437 2438 if (ret) 2439 cm_process_work(cm_id_priv, work); 2440 else 2441 cm_deref_id(cm_id_priv); 2442 return 0; 2443 out: 2444 cm_deref_id(cm_id_priv); 2445 return -EINVAL; 2446 } 2447 2448 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 2449 struct cm_id_private *cm_id_priv, 2450 const void *private_data, 2451 u8 private_data_len) 2452 { 2453 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 2454 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 2455 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 2456 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 2457 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 2458 2459 if (private_data && private_data_len) 2460 memcpy(dreq_msg->private_data, private_data, private_data_len); 2461 } 2462 2463 int ib_send_cm_dreq(struct ib_cm_id *cm_id, 2464 const void *private_data, 2465 u8 private_data_len) 2466 { 2467 struct cm_id_private *cm_id_priv; 2468 struct ib_mad_send_buf *msg; 2469 unsigned long flags; 2470 int ret; 2471 2472 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 2473 return -EINVAL; 2474 2475 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2476 spin_lock_irqsave(&cm_id_priv->lock, flags); 2477 if (cm_id->state != IB_CM_ESTABLISHED) { 2478 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__, 2479 be32_to_cpu(cm_id->local_id), cm_id->state); 2480 ret = -EINVAL; 2481 goto out; 2482 } 2483 2484 if (cm_id->lap_state == IB_CM_LAP_SENT || 2485 cm_id->lap_state == IB_CM_MRA_LAP_RCVD) 2486 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2487 2488 ret = cm_alloc_msg(cm_id_priv, &msg); 2489 if (ret) { 2490 cm_enter_timewait(cm_id_priv); 2491 goto out; 2492 } 2493 2494 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 2495 private_data, private_data_len); 2496 msg->timeout_ms = cm_id_priv->timeout_ms; 2497 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2498 2499 ret = ib_post_send_mad(msg, NULL); 2500 if (ret) { 2501 cm_enter_timewait(cm_id_priv); 2502 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2503 cm_free_msg(msg); 2504 return ret; 2505 } 2506 2507 cm_id->state = IB_CM_DREQ_SENT; 2508 cm_id_priv->msg = msg; 2509 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2510 return ret; 2511 } 2512 EXPORT_SYMBOL(ib_send_cm_dreq); 2513 2514 static void cm_format_drep(struct cm_drep_msg *drep_msg, 2515 struct cm_id_private *cm_id_priv, 2516 const void *private_data, 2517 u8 private_data_len) 2518 { 2519 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2520 drep_msg->local_comm_id = cm_id_priv->id.local_id; 2521 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 2522 2523 if (private_data && private_data_len) 2524 memcpy(drep_msg->private_data, private_data, private_data_len); 2525 } 2526 2527 int ib_send_cm_drep(struct ib_cm_id *cm_id, 2528 const void *private_data, 2529 u8 private_data_len) 2530 { 2531 struct cm_id_private *cm_id_priv; 2532 struct ib_mad_send_buf *msg; 2533 unsigned long flags; 2534 void *data; 2535 int ret; 2536 2537 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2538 return -EINVAL; 2539 2540 data = cm_copy_private_data(private_data, private_data_len); 2541 if (IS_ERR(data)) 2542 return PTR_ERR(data); 2543 2544 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2545 spin_lock_irqsave(&cm_id_priv->lock, flags); 2546 if (cm_id->state != IB_CM_DREQ_RCVD) { 2547 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2548 kfree(data); 2549 pr_debug("%s: local_id %d, cm_idcm_id->state(%d) != IB_CM_DREQ_RCVD\n", 2550 __func__, be32_to_cpu(cm_id->local_id), cm_id->state); 2551 return -EINVAL; 2552 } 2553 2554 cm_set_private_data(cm_id_priv, data, private_data_len); 2555 cm_enter_timewait(cm_id_priv); 2556 2557 ret = cm_alloc_msg(cm_id_priv, &msg); 2558 if (ret) 2559 goto out; 2560 2561 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2562 private_data, private_data_len); 2563 2564 ret = ib_post_send_mad(msg, NULL); 2565 if (ret) { 2566 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2567 cm_free_msg(msg); 2568 return ret; 2569 } 2570 2571 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2572 return ret; 2573 } 2574 EXPORT_SYMBOL(ib_send_cm_drep); 2575 2576 static int cm_issue_drep(struct cm_port *port, 2577 struct ib_mad_recv_wc *mad_recv_wc) 2578 { 2579 struct ib_mad_send_buf *msg = NULL; 2580 struct cm_dreq_msg *dreq_msg; 2581 struct cm_drep_msg *drep_msg; 2582 int ret; 2583 2584 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2585 if (ret) 2586 return ret; 2587 2588 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2589 drep_msg = (struct cm_drep_msg *) msg->mad; 2590 2591 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2592 drep_msg->remote_comm_id = dreq_msg->local_comm_id; 2593 drep_msg->local_comm_id = dreq_msg->remote_comm_id; 2594 2595 ret = ib_post_send_mad(msg, NULL); 2596 if (ret) 2597 cm_free_msg(msg); 2598 2599 return ret; 2600 } 2601 2602 static int cm_dreq_handler(struct cm_work *work) 2603 { 2604 struct cm_id_private *cm_id_priv; 2605 struct cm_dreq_msg *dreq_msg; 2606 struct ib_mad_send_buf *msg = NULL; 2607 int ret; 2608 2609 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2610 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 2611 dreq_msg->local_comm_id); 2612 if (!cm_id_priv) { 2613 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2614 counter[CM_DREQ_COUNTER]); 2615 cm_issue_drep(work->port, work->mad_recv_wc); 2616 pr_debug("%s: no cm_id_priv, local_comm_id %d, remote_comm_id %d\n", 2617 __func__, be32_to_cpu(dreq_msg->local_comm_id), 2618 be32_to_cpu(dreq_msg->remote_comm_id)); 2619 return -EINVAL; 2620 } 2621 2622 work->cm_event.private_data = &dreq_msg->private_data; 2623 2624 spin_lock_irq(&cm_id_priv->lock); 2625 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 2626 goto unlock; 2627 2628 switch (cm_id_priv->id.state) { 2629 case IB_CM_REP_SENT: 2630 case IB_CM_DREQ_SENT: 2631 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2632 break; 2633 case IB_CM_ESTABLISHED: 2634 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2635 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2636 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2637 break; 2638 case IB_CM_MRA_REP_RCVD: 2639 break; 2640 case IB_CM_TIMEWAIT: 2641 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2642 counter[CM_DREQ_COUNTER]); 2643 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc); 2644 if (IS_ERR(msg)) 2645 goto unlock; 2646 2647 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2648 cm_id_priv->private_data, 2649 cm_id_priv->private_data_len); 2650 spin_unlock_irq(&cm_id_priv->lock); 2651 2652 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || 2653 ib_post_send_mad(msg, NULL)) 2654 cm_free_msg(msg); 2655 goto deref; 2656 case IB_CM_DREQ_RCVD: 2657 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2658 counter[CM_DREQ_COUNTER]); 2659 goto unlock; 2660 default: 2661 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n", 2662 __func__, be32_to_cpu(cm_id_priv->id.local_id), 2663 cm_id_priv->id.state); 2664 goto unlock; 2665 } 2666 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2667 cm_id_priv->tid = dreq_msg->hdr.tid; 2668 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2669 if (!ret) 2670 list_add_tail(&work->list, &cm_id_priv->work_list); 2671 spin_unlock_irq(&cm_id_priv->lock); 2672 2673 if (ret) 2674 cm_process_work(cm_id_priv, work); 2675 else 2676 cm_deref_id(cm_id_priv); 2677 return 0; 2678 2679 unlock: spin_unlock_irq(&cm_id_priv->lock); 2680 deref: cm_deref_id(cm_id_priv); 2681 return -EINVAL; 2682 } 2683 2684 static int cm_drep_handler(struct cm_work *work) 2685 { 2686 struct cm_id_private *cm_id_priv; 2687 struct cm_drep_msg *drep_msg; 2688 int ret; 2689 2690 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2691 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 2692 drep_msg->local_comm_id); 2693 if (!cm_id_priv) 2694 return -EINVAL; 2695 2696 work->cm_event.private_data = &drep_msg->private_data; 2697 2698 spin_lock_irq(&cm_id_priv->lock); 2699 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2700 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2701 spin_unlock_irq(&cm_id_priv->lock); 2702 goto out; 2703 } 2704 cm_enter_timewait(cm_id_priv); 2705 2706 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2707 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2708 if (!ret) 2709 list_add_tail(&work->list, &cm_id_priv->work_list); 2710 spin_unlock_irq(&cm_id_priv->lock); 2711 2712 if (ret) 2713 cm_process_work(cm_id_priv, work); 2714 else 2715 cm_deref_id(cm_id_priv); 2716 return 0; 2717 out: 2718 cm_deref_id(cm_id_priv); 2719 return -EINVAL; 2720 } 2721 2722 int ib_send_cm_rej(struct ib_cm_id *cm_id, 2723 enum ib_cm_rej_reason reason, 2724 void *ari, 2725 u8 ari_length, 2726 const void *private_data, 2727 u8 private_data_len) 2728 { 2729 struct cm_id_private *cm_id_priv; 2730 struct ib_mad_send_buf *msg; 2731 unsigned long flags; 2732 int ret; 2733 2734 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2735 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2736 return -EINVAL; 2737 2738 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2739 2740 spin_lock_irqsave(&cm_id_priv->lock, flags); 2741 switch (cm_id->state) { 2742 case IB_CM_REQ_SENT: 2743 case IB_CM_MRA_REQ_RCVD: 2744 case IB_CM_REQ_RCVD: 2745 case IB_CM_MRA_REQ_SENT: 2746 case IB_CM_REP_RCVD: 2747 case IB_CM_MRA_REP_SENT: 2748 ret = cm_alloc_msg(cm_id_priv, &msg); 2749 if (!ret) 2750 cm_format_rej((struct cm_rej_msg *) msg->mad, 2751 cm_id_priv, reason, ari, ari_length, 2752 private_data, private_data_len); 2753 2754 cm_reset_to_idle(cm_id_priv); 2755 break; 2756 case IB_CM_REP_SENT: 2757 case IB_CM_MRA_REP_RCVD: 2758 ret = cm_alloc_msg(cm_id_priv, &msg); 2759 if (!ret) 2760 cm_format_rej((struct cm_rej_msg *) msg->mad, 2761 cm_id_priv, reason, ari, ari_length, 2762 private_data, private_data_len); 2763 2764 cm_enter_timewait(cm_id_priv); 2765 break; 2766 default: 2767 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__, 2768 be32_to_cpu(cm_id_priv->id.local_id), cm_id->state); 2769 ret = -EINVAL; 2770 goto out; 2771 } 2772 2773 if (ret) 2774 goto out; 2775 2776 ret = ib_post_send_mad(msg, NULL); 2777 if (ret) 2778 cm_free_msg(msg); 2779 2780 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2781 return ret; 2782 } 2783 EXPORT_SYMBOL(ib_send_cm_rej); 2784 2785 static void cm_format_rej_event(struct cm_work *work) 2786 { 2787 struct cm_rej_msg *rej_msg; 2788 struct ib_cm_rej_event_param *param; 2789 2790 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2791 param = &work->cm_event.param.rej_rcvd; 2792 param->ari = rej_msg->ari; 2793 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2794 param->reason = __be16_to_cpu(rej_msg->reason); 2795 work->cm_event.private_data = &rej_msg->private_data; 2796 } 2797 2798 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2799 { 2800 struct cm_timewait_info *timewait_info; 2801 struct cm_id_private *cm_id_priv; 2802 __be32 remote_id; 2803 2804 remote_id = rej_msg->local_comm_id; 2805 2806 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2807 spin_lock_irq(&cm.lock); 2808 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2809 remote_id); 2810 if (!timewait_info) { 2811 spin_unlock_irq(&cm.lock); 2812 return NULL; 2813 } 2814 cm_id_priv = idr_find(&cm.local_id_table, (__force int) 2815 (timewait_info->work.local_id ^ 2816 cm.random_id_operand)); 2817 if (cm_id_priv) { 2818 if (cm_id_priv->id.remote_id == remote_id) 2819 atomic_inc(&cm_id_priv->refcount); 2820 else 2821 cm_id_priv = NULL; 2822 } 2823 spin_unlock_irq(&cm.lock); 2824 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2825 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2826 else 2827 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2828 2829 return cm_id_priv; 2830 } 2831 2832 static int cm_rej_handler(struct cm_work *work) 2833 { 2834 struct cm_id_private *cm_id_priv; 2835 struct cm_rej_msg *rej_msg; 2836 int ret; 2837 2838 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2839 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2840 if (!cm_id_priv) 2841 return -EINVAL; 2842 2843 cm_format_rej_event(work); 2844 2845 spin_lock_irq(&cm_id_priv->lock); 2846 switch (cm_id_priv->id.state) { 2847 case IB_CM_REQ_SENT: 2848 case IB_CM_MRA_REQ_RCVD: 2849 case IB_CM_REP_SENT: 2850 case IB_CM_MRA_REP_RCVD: 2851 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2852 /* fall through */ 2853 case IB_CM_REQ_RCVD: 2854 case IB_CM_MRA_REQ_SENT: 2855 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2856 cm_enter_timewait(cm_id_priv); 2857 else 2858 cm_reset_to_idle(cm_id_priv); 2859 break; 2860 case IB_CM_DREQ_SENT: 2861 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2862 /* fall through */ 2863 case IB_CM_REP_RCVD: 2864 case IB_CM_MRA_REP_SENT: 2865 cm_enter_timewait(cm_id_priv); 2866 break; 2867 case IB_CM_ESTABLISHED: 2868 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT || 2869 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) { 2870 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT) 2871 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 2872 cm_id_priv->msg); 2873 cm_enter_timewait(cm_id_priv); 2874 break; 2875 } 2876 /* fall through */ 2877 default: 2878 spin_unlock_irq(&cm_id_priv->lock); 2879 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n", 2880 __func__, be32_to_cpu(cm_id_priv->id.local_id), 2881 cm_id_priv->id.state); 2882 ret = -EINVAL; 2883 goto out; 2884 } 2885 2886 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2887 if (!ret) 2888 list_add_tail(&work->list, &cm_id_priv->work_list); 2889 spin_unlock_irq(&cm_id_priv->lock); 2890 2891 if (ret) 2892 cm_process_work(cm_id_priv, work); 2893 else 2894 cm_deref_id(cm_id_priv); 2895 return 0; 2896 out: 2897 cm_deref_id(cm_id_priv); 2898 return -EINVAL; 2899 } 2900 2901 int ib_send_cm_mra(struct ib_cm_id *cm_id, 2902 u8 service_timeout, 2903 const void *private_data, 2904 u8 private_data_len) 2905 { 2906 struct cm_id_private *cm_id_priv; 2907 struct ib_mad_send_buf *msg; 2908 enum ib_cm_state cm_state; 2909 enum ib_cm_lap_state lap_state; 2910 enum cm_msg_response msg_response; 2911 void *data; 2912 unsigned long flags; 2913 int ret; 2914 2915 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2916 return -EINVAL; 2917 2918 data = cm_copy_private_data(private_data, private_data_len); 2919 if (IS_ERR(data)) 2920 return PTR_ERR(data); 2921 2922 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2923 2924 spin_lock_irqsave(&cm_id_priv->lock, flags); 2925 switch(cm_id_priv->id.state) { 2926 case IB_CM_REQ_RCVD: 2927 cm_state = IB_CM_MRA_REQ_SENT; 2928 lap_state = cm_id->lap_state; 2929 msg_response = CM_MSG_RESPONSE_REQ; 2930 break; 2931 case IB_CM_REP_RCVD: 2932 cm_state = IB_CM_MRA_REP_SENT; 2933 lap_state = cm_id->lap_state; 2934 msg_response = CM_MSG_RESPONSE_REP; 2935 break; 2936 case IB_CM_ESTABLISHED: 2937 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 2938 cm_state = cm_id->state; 2939 lap_state = IB_CM_MRA_LAP_SENT; 2940 msg_response = CM_MSG_RESPONSE_OTHER; 2941 break; 2942 } 2943 /* fall through */ 2944 default: 2945 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n", 2946 __func__, be32_to_cpu(cm_id_priv->id.local_id), 2947 cm_id_priv->id.state); 2948 ret = -EINVAL; 2949 goto error1; 2950 } 2951 2952 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 2953 ret = cm_alloc_msg(cm_id_priv, &msg); 2954 if (ret) 2955 goto error1; 2956 2957 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2958 msg_response, service_timeout, 2959 private_data, private_data_len); 2960 ret = ib_post_send_mad(msg, NULL); 2961 if (ret) 2962 goto error2; 2963 } 2964 2965 cm_id->state = cm_state; 2966 cm_id->lap_state = lap_state; 2967 cm_id_priv->service_timeout = service_timeout; 2968 cm_set_private_data(cm_id_priv, data, private_data_len); 2969 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2970 return 0; 2971 2972 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2973 kfree(data); 2974 return ret; 2975 2976 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2977 kfree(data); 2978 cm_free_msg(msg); 2979 return ret; 2980 } 2981 EXPORT_SYMBOL(ib_send_cm_mra); 2982 2983 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2984 { 2985 switch (cm_mra_get_msg_mraed(mra_msg)) { 2986 case CM_MSG_RESPONSE_REQ: 2987 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2988 case CM_MSG_RESPONSE_REP: 2989 case CM_MSG_RESPONSE_OTHER: 2990 return cm_acquire_id(mra_msg->remote_comm_id, 2991 mra_msg->local_comm_id); 2992 default: 2993 return NULL; 2994 } 2995 } 2996 2997 static int cm_mra_handler(struct cm_work *work) 2998 { 2999 struct cm_id_private *cm_id_priv; 3000 struct cm_mra_msg *mra_msg; 3001 int timeout, ret; 3002 3003 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 3004 cm_id_priv = cm_acquire_mraed_id(mra_msg); 3005 if (!cm_id_priv) 3006 return -EINVAL; 3007 3008 work->cm_event.private_data = &mra_msg->private_data; 3009 work->cm_event.param.mra_rcvd.service_timeout = 3010 cm_mra_get_service_timeout(mra_msg); 3011 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 3012 cm_convert_to_ms(cm_id_priv->av.timeout); 3013 3014 spin_lock_irq(&cm_id_priv->lock); 3015 switch (cm_id_priv->id.state) { 3016 case IB_CM_REQ_SENT: 3017 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 3018 ib_modify_mad(cm_id_priv->av.port->mad_agent, 3019 cm_id_priv->msg, timeout)) 3020 goto out; 3021 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 3022 break; 3023 case IB_CM_REP_SENT: 3024 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 3025 ib_modify_mad(cm_id_priv->av.port->mad_agent, 3026 cm_id_priv->msg, timeout)) 3027 goto out; 3028 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 3029 break; 3030 case IB_CM_ESTABLISHED: 3031 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 3032 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 3033 ib_modify_mad(cm_id_priv->av.port->mad_agent, 3034 cm_id_priv->msg, timeout)) { 3035 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 3036 atomic_long_inc(&work->port-> 3037 counter_group[CM_RECV_DUPLICATES]. 3038 counter[CM_MRA_COUNTER]); 3039 goto out; 3040 } 3041 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 3042 break; 3043 case IB_CM_MRA_REQ_RCVD: 3044 case IB_CM_MRA_REP_RCVD: 3045 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3046 counter[CM_MRA_COUNTER]); 3047 /* fall through */ 3048 default: 3049 pr_debug("%s local_id %d, cm_id_priv->id.state: %d\n", 3050 __func__, be32_to_cpu(cm_id_priv->id.local_id), 3051 cm_id_priv->id.state); 3052 goto out; 3053 } 3054 3055 cm_id_priv->msg->context[1] = (void *) (unsigned long) 3056 cm_id_priv->id.state; 3057 ret = atomic_inc_and_test(&cm_id_priv->work_count); 3058 if (!ret) 3059 list_add_tail(&work->list, &cm_id_priv->work_list); 3060 spin_unlock_irq(&cm_id_priv->lock); 3061 3062 if (ret) 3063 cm_process_work(cm_id_priv, work); 3064 else 3065 cm_deref_id(cm_id_priv); 3066 return 0; 3067 out: 3068 spin_unlock_irq(&cm_id_priv->lock); 3069 cm_deref_id(cm_id_priv); 3070 return -EINVAL; 3071 } 3072 3073 static void cm_format_lap(struct cm_lap_msg *lap_msg, 3074 struct cm_id_private *cm_id_priv, 3075 struct sa_path_rec *alternate_path, 3076 const void *private_data, 3077 u8 private_data_len) 3078 { 3079 bool alt_ext = false; 3080 3081 if (alternate_path->rec_type == SA_PATH_REC_TYPE_OPA) 3082 alt_ext = opa_is_extended_lid(alternate_path->opa.dlid, 3083 alternate_path->opa.slid); 3084 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 3085 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 3086 lap_msg->local_comm_id = cm_id_priv->id.local_id; 3087 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 3088 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 3089 /* todo: need remote CM response timeout */ 3090 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 3091 lap_msg->alt_local_lid = 3092 htons(ntohl(sa_path_get_slid(alternate_path))); 3093 lap_msg->alt_remote_lid = 3094 htons(ntohl(sa_path_get_dlid(alternate_path))); 3095 lap_msg->alt_local_gid = alternate_path->sgid; 3096 lap_msg->alt_remote_gid = alternate_path->dgid; 3097 if (alt_ext) { 3098 lap_msg->alt_local_gid.global.interface_id 3099 = OPA_MAKE_ID(be32_to_cpu(alternate_path->opa.slid)); 3100 lap_msg->alt_remote_gid.global.interface_id 3101 = OPA_MAKE_ID(be32_to_cpu(alternate_path->opa.dlid)); 3102 } 3103 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 3104 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 3105 lap_msg->alt_hop_limit = alternate_path->hop_limit; 3106 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 3107 cm_lap_set_sl(lap_msg, alternate_path->sl); 3108 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 3109 cm_lap_set_local_ack_timeout(lap_msg, 3110 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 3111 alternate_path->packet_life_time)); 3112 3113 if (private_data && private_data_len) 3114 memcpy(lap_msg->private_data, private_data, private_data_len); 3115 } 3116 3117 int ib_send_cm_lap(struct ib_cm_id *cm_id, 3118 struct sa_path_rec *alternate_path, 3119 const void *private_data, 3120 u8 private_data_len) 3121 { 3122 struct cm_id_private *cm_id_priv; 3123 struct ib_mad_send_buf *msg; 3124 unsigned long flags; 3125 int ret; 3126 3127 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 3128 return -EINVAL; 3129 3130 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3131 spin_lock_irqsave(&cm_id_priv->lock, flags); 3132 if (cm_id->state != IB_CM_ESTABLISHED || 3133 (cm_id->lap_state != IB_CM_LAP_UNINIT && 3134 cm_id->lap_state != IB_CM_LAP_IDLE)) { 3135 ret = -EINVAL; 3136 goto out; 3137 } 3138 3139 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av, 3140 cm_id_priv); 3141 if (ret) 3142 goto out; 3143 cm_id_priv->alt_av.timeout = 3144 cm_ack_timeout(cm_id_priv->target_ack_delay, 3145 cm_id_priv->alt_av.timeout - 1); 3146 3147 ret = cm_alloc_msg(cm_id_priv, &msg); 3148 if (ret) 3149 goto out; 3150 3151 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 3152 alternate_path, private_data, private_data_len); 3153 msg->timeout_ms = cm_id_priv->timeout_ms; 3154 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 3155 3156 ret = ib_post_send_mad(msg, NULL); 3157 if (ret) { 3158 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3159 cm_free_msg(msg); 3160 return ret; 3161 } 3162 3163 cm_id->lap_state = IB_CM_LAP_SENT; 3164 cm_id_priv->msg = msg; 3165 3166 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3167 return ret; 3168 } 3169 EXPORT_SYMBOL(ib_send_cm_lap); 3170 3171 static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg, 3172 struct sa_path_rec *path) 3173 { 3174 u32 lid; 3175 3176 if (path->rec_type != SA_PATH_REC_TYPE_OPA) { 3177 sa_path_set_dlid(path, ntohs(lap_msg->alt_local_lid)); 3178 sa_path_set_slid(path, ntohs(lap_msg->alt_remote_lid)); 3179 } else { 3180 lid = opa_get_lid_from_gid(&lap_msg->alt_local_gid); 3181 sa_path_set_dlid(path, lid); 3182 3183 lid = opa_get_lid_from_gid(&lap_msg->alt_remote_gid); 3184 sa_path_set_slid(path, lid); 3185 } 3186 } 3187 3188 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 3189 struct sa_path_rec *path, 3190 struct cm_lap_msg *lap_msg) 3191 { 3192 path->dgid = lap_msg->alt_local_gid; 3193 path->sgid = lap_msg->alt_remote_gid; 3194 path->flow_label = cm_lap_get_flow_label(lap_msg); 3195 path->hop_limit = lap_msg->alt_hop_limit; 3196 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 3197 path->reversible = 1; 3198 path->pkey = cm_id_priv->pkey; 3199 path->sl = cm_lap_get_sl(lap_msg); 3200 path->mtu_selector = IB_SA_EQ; 3201 path->mtu = cm_id_priv->path_mtu; 3202 path->rate_selector = IB_SA_EQ; 3203 path->rate = cm_lap_get_packet_rate(lap_msg); 3204 path->packet_life_time_selector = IB_SA_EQ; 3205 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 3206 path->packet_life_time -= (path->packet_life_time > 0); 3207 cm_format_path_lid_from_lap(lap_msg, path); 3208 } 3209 3210 static int cm_lap_handler(struct cm_work *work) 3211 { 3212 struct cm_id_private *cm_id_priv; 3213 struct cm_lap_msg *lap_msg; 3214 struct ib_cm_lap_event_param *param; 3215 struct ib_mad_send_buf *msg = NULL; 3216 int ret; 3217 3218 /* Currently Alternate path messages are not supported for 3219 * RoCE link layer. 3220 */ 3221 if (rdma_protocol_roce(work->port->cm_dev->ib_device, 3222 work->port->port_num)) 3223 return -EINVAL; 3224 3225 /* todo: verify LAP request and send reject APR if invalid. */ 3226 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 3227 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 3228 lap_msg->local_comm_id); 3229 if (!cm_id_priv) 3230 return -EINVAL; 3231 3232 param = &work->cm_event.param.lap_rcvd; 3233 memset(&work->path[0], 0, sizeof(work->path[1])); 3234 cm_path_set_rec_type(work->port->cm_dev->ib_device, 3235 work->port->port_num, 3236 &work->path[0], 3237 &lap_msg->alt_local_gid); 3238 param->alternate_path = &work->path[0]; 3239 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 3240 work->cm_event.private_data = &lap_msg->private_data; 3241 3242 spin_lock_irq(&cm_id_priv->lock); 3243 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 3244 goto unlock; 3245 3246 switch (cm_id_priv->id.lap_state) { 3247 case IB_CM_LAP_UNINIT: 3248 case IB_CM_LAP_IDLE: 3249 break; 3250 case IB_CM_MRA_LAP_SENT: 3251 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3252 counter[CM_LAP_COUNTER]); 3253 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc); 3254 if (IS_ERR(msg)) 3255 goto unlock; 3256 3257 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 3258 CM_MSG_RESPONSE_OTHER, 3259 cm_id_priv->service_timeout, 3260 cm_id_priv->private_data, 3261 cm_id_priv->private_data_len); 3262 spin_unlock_irq(&cm_id_priv->lock); 3263 3264 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || 3265 ib_post_send_mad(msg, NULL)) 3266 cm_free_msg(msg); 3267 goto deref; 3268 case IB_CM_LAP_RCVD: 3269 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3270 counter[CM_LAP_COUNTER]); 3271 goto unlock; 3272 default: 3273 goto unlock; 3274 } 3275 3276 ret = cm_init_av_for_lap(work->port, work->mad_recv_wc->wc, 3277 work->mad_recv_wc->recv_buf.grh, 3278 &cm_id_priv->av); 3279 if (ret) 3280 goto unlock; 3281 3282 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av, 3283 cm_id_priv); 3284 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 3285 cm_id_priv->tid = lap_msg->hdr.tid; 3286 ret = atomic_inc_and_test(&cm_id_priv->work_count); 3287 if (!ret) 3288 list_add_tail(&work->list, &cm_id_priv->work_list); 3289 spin_unlock_irq(&cm_id_priv->lock); 3290 3291 if (ret) 3292 cm_process_work(cm_id_priv, work); 3293 else 3294 cm_deref_id(cm_id_priv); 3295 return 0; 3296 3297 unlock: spin_unlock_irq(&cm_id_priv->lock); 3298 deref: cm_deref_id(cm_id_priv); 3299 return -EINVAL; 3300 } 3301 3302 static void cm_format_apr(struct cm_apr_msg *apr_msg, 3303 struct cm_id_private *cm_id_priv, 3304 enum ib_cm_apr_status status, 3305 void *info, 3306 u8 info_length, 3307 const void *private_data, 3308 u8 private_data_len) 3309 { 3310 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 3311 apr_msg->local_comm_id = cm_id_priv->id.local_id; 3312 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 3313 apr_msg->ap_status = (u8) status; 3314 3315 if (info && info_length) { 3316 apr_msg->info_length = info_length; 3317 memcpy(apr_msg->info, info, info_length); 3318 } 3319 3320 if (private_data && private_data_len) 3321 memcpy(apr_msg->private_data, private_data, private_data_len); 3322 } 3323 3324 int ib_send_cm_apr(struct ib_cm_id *cm_id, 3325 enum ib_cm_apr_status status, 3326 void *info, 3327 u8 info_length, 3328 const void *private_data, 3329 u8 private_data_len) 3330 { 3331 struct cm_id_private *cm_id_priv; 3332 struct ib_mad_send_buf *msg; 3333 unsigned long flags; 3334 int ret; 3335 3336 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 3337 (info && info_length > IB_CM_APR_INFO_LENGTH)) 3338 return -EINVAL; 3339 3340 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3341 spin_lock_irqsave(&cm_id_priv->lock, flags); 3342 if (cm_id->state != IB_CM_ESTABLISHED || 3343 (cm_id->lap_state != IB_CM_LAP_RCVD && 3344 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 3345 ret = -EINVAL; 3346 goto out; 3347 } 3348 3349 ret = cm_alloc_msg(cm_id_priv, &msg); 3350 if (ret) 3351 goto out; 3352 3353 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 3354 info, info_length, private_data, private_data_len); 3355 ret = ib_post_send_mad(msg, NULL); 3356 if (ret) { 3357 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3358 cm_free_msg(msg); 3359 return ret; 3360 } 3361 3362 cm_id->lap_state = IB_CM_LAP_IDLE; 3363 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3364 return ret; 3365 } 3366 EXPORT_SYMBOL(ib_send_cm_apr); 3367 3368 static int cm_apr_handler(struct cm_work *work) 3369 { 3370 struct cm_id_private *cm_id_priv; 3371 struct cm_apr_msg *apr_msg; 3372 int ret; 3373 3374 /* Currently Alternate path messages are not supported for 3375 * RoCE link layer. 3376 */ 3377 if (rdma_protocol_roce(work->port->cm_dev->ib_device, 3378 work->port->port_num)) 3379 return -EINVAL; 3380 3381 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 3382 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 3383 apr_msg->local_comm_id); 3384 if (!cm_id_priv) 3385 return -EINVAL; /* Unmatched reply. */ 3386 3387 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 3388 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 3389 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 3390 work->cm_event.private_data = &apr_msg->private_data; 3391 3392 spin_lock_irq(&cm_id_priv->lock); 3393 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 3394 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 3395 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 3396 spin_unlock_irq(&cm_id_priv->lock); 3397 goto out; 3398 } 3399 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 3400 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3401 cm_id_priv->msg = NULL; 3402 3403 ret = atomic_inc_and_test(&cm_id_priv->work_count); 3404 if (!ret) 3405 list_add_tail(&work->list, &cm_id_priv->work_list); 3406 spin_unlock_irq(&cm_id_priv->lock); 3407 3408 if (ret) 3409 cm_process_work(cm_id_priv, work); 3410 else 3411 cm_deref_id(cm_id_priv); 3412 return 0; 3413 out: 3414 cm_deref_id(cm_id_priv); 3415 return -EINVAL; 3416 } 3417 3418 static int cm_timewait_handler(struct cm_work *work) 3419 { 3420 struct cm_timewait_info *timewait_info; 3421 struct cm_id_private *cm_id_priv; 3422 int ret; 3423 3424 timewait_info = (struct cm_timewait_info *)work; 3425 spin_lock_irq(&cm.lock); 3426 list_del(&timewait_info->list); 3427 spin_unlock_irq(&cm.lock); 3428 3429 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 3430 timewait_info->work.remote_id); 3431 if (!cm_id_priv) 3432 return -EINVAL; 3433 3434 spin_lock_irq(&cm_id_priv->lock); 3435 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 3436 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 3437 spin_unlock_irq(&cm_id_priv->lock); 3438 goto out; 3439 } 3440 cm_id_priv->id.state = IB_CM_IDLE; 3441 ret = atomic_inc_and_test(&cm_id_priv->work_count); 3442 if (!ret) 3443 list_add_tail(&work->list, &cm_id_priv->work_list); 3444 spin_unlock_irq(&cm_id_priv->lock); 3445 3446 if (ret) 3447 cm_process_work(cm_id_priv, work); 3448 else 3449 cm_deref_id(cm_id_priv); 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, CM_MSG_SEQUENCE_SIDR)); 3462 sidr_req_msg->request_id = cm_id_priv->id.local_id; 3463 sidr_req_msg->pkey = param->path->pkey; 3464 sidr_req_msg->service_id = param->service_id; 3465 3466 if (param->private_data && param->private_data_len) 3467 memcpy(sidr_req_msg->private_data, param->private_data, 3468 param->private_data_len); 3469 } 3470 3471 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 3472 struct ib_cm_sidr_req_param *param) 3473 { 3474 struct cm_id_private *cm_id_priv; 3475 struct ib_mad_send_buf *msg; 3476 unsigned long flags; 3477 int ret; 3478 3479 if (!param->path || (param->private_data && 3480 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 3481 return -EINVAL; 3482 3483 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3484 ret = cm_init_av_by_path(param->path, &cm_id_priv->av, cm_id_priv); 3485 if (ret) 3486 goto out; 3487 3488 cm_id->service_id = param->service_id; 3489 cm_id->service_mask = ~cpu_to_be64(0); 3490 cm_id_priv->timeout_ms = param->timeout_ms; 3491 cm_id_priv->max_cm_retries = param->max_cm_retries; 3492 ret = cm_alloc_msg(cm_id_priv, &msg); 3493 if (ret) 3494 goto out; 3495 3496 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 3497 param); 3498 msg->timeout_ms = cm_id_priv->timeout_ms; 3499 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 3500 3501 spin_lock_irqsave(&cm_id_priv->lock, flags); 3502 if (cm_id->state == IB_CM_IDLE) 3503 ret = ib_post_send_mad(msg, NULL); 3504 else 3505 ret = -EINVAL; 3506 3507 if (ret) { 3508 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3509 cm_free_msg(msg); 3510 goto out; 3511 } 3512 cm_id->state = IB_CM_SIDR_REQ_SENT; 3513 cm_id_priv->msg = msg; 3514 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3515 out: 3516 return ret; 3517 } 3518 EXPORT_SYMBOL(ib_send_cm_sidr_req); 3519 3520 static void cm_format_sidr_req_event(struct cm_work *work, 3521 struct ib_cm_id *listen_id) 3522 { 3523 struct cm_sidr_req_msg *sidr_req_msg; 3524 struct ib_cm_sidr_req_event_param *param; 3525 3526 sidr_req_msg = (struct cm_sidr_req_msg *) 3527 work->mad_recv_wc->recv_buf.mad; 3528 param = &work->cm_event.param.sidr_req_rcvd; 3529 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 3530 param->listen_id = listen_id; 3531 param->service_id = sidr_req_msg->service_id; 3532 param->bth_pkey = cm_get_bth_pkey(work); 3533 param->port = work->port->port_num; 3534 work->cm_event.private_data = &sidr_req_msg->private_data; 3535 } 3536 3537 static int cm_sidr_req_handler(struct cm_work *work) 3538 { 3539 struct ib_cm_id *cm_id; 3540 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 3541 struct cm_sidr_req_msg *sidr_req_msg; 3542 struct ib_wc *wc; 3543 int ret; 3544 3545 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 3546 if (IS_ERR(cm_id)) 3547 return PTR_ERR(cm_id); 3548 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3549 3550 /* Record SGID/SLID and request ID for lookup. */ 3551 sidr_req_msg = (struct cm_sidr_req_msg *) 3552 work->mad_recv_wc->recv_buf.mad; 3553 wc = work->mad_recv_wc->wc; 3554 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 3555 cm_id_priv->av.dgid.global.interface_id = 0; 3556 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 3557 work->mad_recv_wc->recv_buf.grh, 3558 &cm_id_priv->av); 3559 if (ret) 3560 goto out; 3561 3562 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 3563 cm_id_priv->tid = sidr_req_msg->hdr.tid; 3564 atomic_inc(&cm_id_priv->work_count); 3565 3566 spin_lock_irq(&cm.lock); 3567 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 3568 if (cur_cm_id_priv) { 3569 spin_unlock_irq(&cm.lock); 3570 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3571 counter[CM_SIDR_REQ_COUNTER]); 3572 goto out; /* Duplicate message. */ 3573 } 3574 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3575 cur_cm_id_priv = cm_find_listen(cm_id->device, 3576 sidr_req_msg->service_id); 3577 if (!cur_cm_id_priv) { 3578 spin_unlock_irq(&cm.lock); 3579 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED); 3580 goto out; /* No match. */ 3581 } 3582 atomic_inc(&cur_cm_id_priv->refcount); 3583 atomic_inc(&cm_id_priv->refcount); 3584 spin_unlock_irq(&cm.lock); 3585 3586 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 3587 cm_id_priv->id.context = cur_cm_id_priv->id.context; 3588 cm_id_priv->id.service_id = sidr_req_msg->service_id; 3589 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 3590 3591 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 3592 cm_process_work(cm_id_priv, work); 3593 cm_deref_id(cur_cm_id_priv); 3594 return 0; 3595 out: 3596 ib_destroy_cm_id(&cm_id_priv->id); 3597 return -EINVAL; 3598 } 3599 3600 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3601 struct cm_id_private *cm_id_priv, 3602 struct ib_cm_sidr_rep_param *param) 3603 { 3604 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3605 cm_id_priv->tid); 3606 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 3607 sidr_rep_msg->status = param->status; 3608 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 3609 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 3610 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 3611 3612 if (param->info && param->info_length) 3613 memcpy(sidr_rep_msg->info, param->info, param->info_length); 3614 3615 if (param->private_data && param->private_data_len) 3616 memcpy(sidr_rep_msg->private_data, param->private_data, 3617 param->private_data_len); 3618 } 3619 3620 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3621 struct ib_cm_sidr_rep_param *param) 3622 { 3623 struct cm_id_private *cm_id_priv; 3624 struct ib_mad_send_buf *msg; 3625 unsigned long flags; 3626 int ret; 3627 3628 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3629 (param->private_data && 3630 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3631 return -EINVAL; 3632 3633 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3634 spin_lock_irqsave(&cm_id_priv->lock, flags); 3635 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 3636 ret = -EINVAL; 3637 goto error; 3638 } 3639 3640 ret = cm_alloc_msg(cm_id_priv, &msg); 3641 if (ret) 3642 goto error; 3643 3644 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3645 param); 3646 ret = ib_post_send_mad(msg, NULL); 3647 if (ret) { 3648 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3649 cm_free_msg(msg); 3650 return ret; 3651 } 3652 cm_id->state = IB_CM_IDLE; 3653 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3654 3655 spin_lock_irqsave(&cm.lock, flags); 3656 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) { 3657 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3658 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); 3659 } 3660 spin_unlock_irqrestore(&cm.lock, flags); 3661 return 0; 3662 3663 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3664 return ret; 3665 } 3666 EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3667 3668 static void cm_format_sidr_rep_event(struct cm_work *work) 3669 { 3670 struct cm_sidr_rep_msg *sidr_rep_msg; 3671 struct ib_cm_sidr_rep_event_param *param; 3672 3673 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3674 work->mad_recv_wc->recv_buf.mad; 3675 param = &work->cm_event.param.sidr_rep_rcvd; 3676 param->status = sidr_rep_msg->status; 3677 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 3678 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 3679 param->info = &sidr_rep_msg->info; 3680 param->info_len = sidr_rep_msg->info_length; 3681 work->cm_event.private_data = &sidr_rep_msg->private_data; 3682 } 3683 3684 static int cm_sidr_rep_handler(struct cm_work *work) 3685 { 3686 struct cm_sidr_rep_msg *sidr_rep_msg; 3687 struct cm_id_private *cm_id_priv; 3688 3689 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3690 work->mad_recv_wc->recv_buf.mad; 3691 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 3692 if (!cm_id_priv) 3693 return -EINVAL; /* Unmatched reply. */ 3694 3695 spin_lock_irq(&cm_id_priv->lock); 3696 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3697 spin_unlock_irq(&cm_id_priv->lock); 3698 goto out; 3699 } 3700 cm_id_priv->id.state = IB_CM_IDLE; 3701 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3702 spin_unlock_irq(&cm_id_priv->lock); 3703 3704 cm_format_sidr_rep_event(work); 3705 cm_process_work(cm_id_priv, work); 3706 return 0; 3707 out: 3708 cm_deref_id(cm_id_priv); 3709 return -EINVAL; 3710 } 3711 3712 static void cm_process_send_error(struct ib_mad_send_buf *msg, 3713 enum ib_wc_status wc_status) 3714 { 3715 struct cm_id_private *cm_id_priv; 3716 struct ib_cm_event cm_event; 3717 enum ib_cm_state state; 3718 int ret; 3719 3720 memset(&cm_event, 0, sizeof cm_event); 3721 cm_id_priv = msg->context[0]; 3722 3723 /* Discard old sends or ones without a response. */ 3724 spin_lock_irq(&cm_id_priv->lock); 3725 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3726 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3727 goto discard; 3728 3729 pr_debug_ratelimited("CM: failed sending MAD in state %d. (%s)\n", 3730 state, ib_wc_status_msg(wc_status)); 3731 switch (state) { 3732 case IB_CM_REQ_SENT: 3733 case IB_CM_MRA_REQ_RCVD: 3734 cm_reset_to_idle(cm_id_priv); 3735 cm_event.event = IB_CM_REQ_ERROR; 3736 break; 3737 case IB_CM_REP_SENT: 3738 case IB_CM_MRA_REP_RCVD: 3739 cm_reset_to_idle(cm_id_priv); 3740 cm_event.event = IB_CM_REP_ERROR; 3741 break; 3742 case IB_CM_DREQ_SENT: 3743 cm_enter_timewait(cm_id_priv); 3744 cm_event.event = IB_CM_DREQ_ERROR; 3745 break; 3746 case IB_CM_SIDR_REQ_SENT: 3747 cm_id_priv->id.state = IB_CM_IDLE; 3748 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3749 break; 3750 default: 3751 goto discard; 3752 } 3753 spin_unlock_irq(&cm_id_priv->lock); 3754 cm_event.param.send_status = wc_status; 3755 3756 /* No other events can occur on the cm_id at this point. */ 3757 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3758 cm_free_msg(msg); 3759 if (ret) 3760 ib_destroy_cm_id(&cm_id_priv->id); 3761 return; 3762 discard: 3763 spin_unlock_irq(&cm_id_priv->lock); 3764 cm_free_msg(msg); 3765 } 3766 3767 static void cm_send_handler(struct ib_mad_agent *mad_agent, 3768 struct ib_mad_send_wc *mad_send_wc) 3769 { 3770 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3771 struct cm_port *port; 3772 u16 attr_index; 3773 3774 port = mad_agent->context; 3775 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3776 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3777 3778 /* 3779 * If the send was in response to a received message (context[0] is not 3780 * set to a cm_id), and is not a REJ, then it is a send that was 3781 * manually retried. 3782 */ 3783 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3784 msg->retries = 1; 3785 3786 atomic_long_add(1 + msg->retries, 3787 &port->counter_group[CM_XMIT].counter[attr_index]); 3788 if (msg->retries) 3789 atomic_long_add(msg->retries, 3790 &port->counter_group[CM_XMIT_RETRIES]. 3791 counter[attr_index]); 3792 3793 switch (mad_send_wc->status) { 3794 case IB_WC_SUCCESS: 3795 case IB_WC_WR_FLUSH_ERR: 3796 cm_free_msg(msg); 3797 break; 3798 default: 3799 if (msg->context[0] && msg->context[1]) 3800 cm_process_send_error(msg, mad_send_wc->status); 3801 else 3802 cm_free_msg(msg); 3803 break; 3804 } 3805 } 3806 3807 static void cm_work_handler(struct work_struct *_work) 3808 { 3809 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3810 int ret; 3811 3812 switch (work->cm_event.event) { 3813 case IB_CM_REQ_RECEIVED: 3814 ret = cm_req_handler(work); 3815 break; 3816 case IB_CM_MRA_RECEIVED: 3817 ret = cm_mra_handler(work); 3818 break; 3819 case IB_CM_REJ_RECEIVED: 3820 ret = cm_rej_handler(work); 3821 break; 3822 case IB_CM_REP_RECEIVED: 3823 ret = cm_rep_handler(work); 3824 break; 3825 case IB_CM_RTU_RECEIVED: 3826 ret = cm_rtu_handler(work); 3827 break; 3828 case IB_CM_USER_ESTABLISHED: 3829 ret = cm_establish_handler(work); 3830 break; 3831 case IB_CM_DREQ_RECEIVED: 3832 ret = cm_dreq_handler(work); 3833 break; 3834 case IB_CM_DREP_RECEIVED: 3835 ret = cm_drep_handler(work); 3836 break; 3837 case IB_CM_SIDR_REQ_RECEIVED: 3838 ret = cm_sidr_req_handler(work); 3839 break; 3840 case IB_CM_SIDR_REP_RECEIVED: 3841 ret = cm_sidr_rep_handler(work); 3842 break; 3843 case IB_CM_LAP_RECEIVED: 3844 ret = cm_lap_handler(work); 3845 break; 3846 case IB_CM_APR_RECEIVED: 3847 ret = cm_apr_handler(work); 3848 break; 3849 case IB_CM_TIMEWAIT_EXIT: 3850 ret = cm_timewait_handler(work); 3851 break; 3852 default: 3853 pr_debug("cm_event.event: 0x%x\n", work->cm_event.event); 3854 ret = -EINVAL; 3855 break; 3856 } 3857 if (ret) 3858 cm_free_work(work); 3859 } 3860 3861 static int cm_establish(struct ib_cm_id *cm_id) 3862 { 3863 struct cm_id_private *cm_id_priv; 3864 struct cm_work *work; 3865 unsigned long flags; 3866 int ret = 0; 3867 struct cm_device *cm_dev; 3868 3869 cm_dev = ib_get_client_data(cm_id->device, &cm_client); 3870 if (!cm_dev) 3871 return -ENODEV; 3872 3873 work = kmalloc(sizeof *work, GFP_ATOMIC); 3874 if (!work) 3875 return -ENOMEM; 3876 3877 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3878 spin_lock_irqsave(&cm_id_priv->lock, flags); 3879 switch (cm_id->state) 3880 { 3881 case IB_CM_REP_SENT: 3882 case IB_CM_MRA_REP_RCVD: 3883 cm_id->state = IB_CM_ESTABLISHED; 3884 break; 3885 case IB_CM_ESTABLISHED: 3886 ret = -EISCONN; 3887 break; 3888 default: 3889 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__, 3890 be32_to_cpu(cm_id->local_id), cm_id->state); 3891 ret = -EINVAL; 3892 break; 3893 } 3894 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3895 3896 if (ret) { 3897 kfree(work); 3898 goto out; 3899 } 3900 3901 /* 3902 * The CM worker thread may try to destroy the cm_id before it 3903 * can execute this work item. To prevent potential deadlock, 3904 * we need to find the cm_id once we're in the context of the 3905 * worker thread, rather than holding a reference on it. 3906 */ 3907 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3908 work->local_id = cm_id->local_id; 3909 work->remote_id = cm_id->remote_id; 3910 work->mad_recv_wc = NULL; 3911 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3912 3913 /* Check if the device started its remove_one */ 3914 spin_lock_irqsave(&cm.lock, flags); 3915 if (!cm_dev->going_down) { 3916 queue_delayed_work(cm.wq, &work->work, 0); 3917 } else { 3918 kfree(work); 3919 ret = -ENODEV; 3920 } 3921 spin_unlock_irqrestore(&cm.lock, flags); 3922 3923 out: 3924 return ret; 3925 } 3926 3927 static int cm_migrate(struct ib_cm_id *cm_id) 3928 { 3929 struct cm_id_private *cm_id_priv; 3930 struct cm_av tmp_av; 3931 unsigned long flags; 3932 int tmp_send_port_not_ready; 3933 int ret = 0; 3934 3935 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3936 spin_lock_irqsave(&cm_id_priv->lock, flags); 3937 if (cm_id->state == IB_CM_ESTABLISHED && 3938 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3939 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3940 cm_id->lap_state = IB_CM_LAP_IDLE; 3941 /* Swap address vector */ 3942 tmp_av = cm_id_priv->av; 3943 cm_id_priv->av = cm_id_priv->alt_av; 3944 cm_id_priv->alt_av = tmp_av; 3945 /* Swap port send ready state */ 3946 tmp_send_port_not_ready = cm_id_priv->prim_send_port_not_ready; 3947 cm_id_priv->prim_send_port_not_ready = cm_id_priv->altr_send_port_not_ready; 3948 cm_id_priv->altr_send_port_not_ready = tmp_send_port_not_ready; 3949 } else 3950 ret = -EINVAL; 3951 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3952 3953 return ret; 3954 } 3955 3956 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3957 { 3958 int ret; 3959 3960 switch (event) { 3961 case IB_EVENT_COMM_EST: 3962 ret = cm_establish(cm_id); 3963 break; 3964 case IB_EVENT_PATH_MIG: 3965 ret = cm_migrate(cm_id); 3966 break; 3967 default: 3968 ret = -EINVAL; 3969 } 3970 return ret; 3971 } 3972 EXPORT_SYMBOL(ib_cm_notify); 3973 3974 static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3975 struct ib_mad_send_buf *send_buf, 3976 struct ib_mad_recv_wc *mad_recv_wc) 3977 { 3978 struct cm_port *port = mad_agent->context; 3979 struct cm_work *work; 3980 enum ib_cm_event_type event; 3981 bool alt_path = false; 3982 u16 attr_id; 3983 int paths = 0; 3984 int going_down = 0; 3985 3986 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3987 case CM_REQ_ATTR_ID: 3988 alt_path = cm_req_has_alt_path((struct cm_req_msg *) 3989 mad_recv_wc->recv_buf.mad); 3990 paths = 1 + (alt_path != 0); 3991 event = IB_CM_REQ_RECEIVED; 3992 break; 3993 case CM_MRA_ATTR_ID: 3994 event = IB_CM_MRA_RECEIVED; 3995 break; 3996 case CM_REJ_ATTR_ID: 3997 event = IB_CM_REJ_RECEIVED; 3998 break; 3999 case CM_REP_ATTR_ID: 4000 event = IB_CM_REP_RECEIVED; 4001 break; 4002 case CM_RTU_ATTR_ID: 4003 event = IB_CM_RTU_RECEIVED; 4004 break; 4005 case CM_DREQ_ATTR_ID: 4006 event = IB_CM_DREQ_RECEIVED; 4007 break; 4008 case CM_DREP_ATTR_ID: 4009 event = IB_CM_DREP_RECEIVED; 4010 break; 4011 case CM_SIDR_REQ_ATTR_ID: 4012 event = IB_CM_SIDR_REQ_RECEIVED; 4013 break; 4014 case CM_SIDR_REP_ATTR_ID: 4015 event = IB_CM_SIDR_REP_RECEIVED; 4016 break; 4017 case CM_LAP_ATTR_ID: 4018 paths = 1; 4019 event = IB_CM_LAP_RECEIVED; 4020 break; 4021 case CM_APR_ATTR_ID: 4022 event = IB_CM_APR_RECEIVED; 4023 break; 4024 default: 4025 ib_free_recv_mad(mad_recv_wc); 4026 return; 4027 } 4028 4029 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 4030 atomic_long_inc(&port->counter_group[CM_RECV]. 4031 counter[attr_id - CM_ATTR_ID_OFFSET]); 4032 4033 work = kmalloc(sizeof(*work) + sizeof(struct sa_path_rec) * paths, 4034 GFP_KERNEL); 4035 if (!work) { 4036 ib_free_recv_mad(mad_recv_wc); 4037 return; 4038 } 4039 4040 INIT_DELAYED_WORK(&work->work, cm_work_handler); 4041 work->cm_event.event = event; 4042 work->mad_recv_wc = mad_recv_wc; 4043 work->port = port; 4044 4045 /* Check if the device started its remove_one */ 4046 spin_lock_irq(&cm.lock); 4047 if (!port->cm_dev->going_down) 4048 queue_delayed_work(cm.wq, &work->work, 0); 4049 else 4050 going_down = 1; 4051 spin_unlock_irq(&cm.lock); 4052 4053 if (going_down) { 4054 kfree(work); 4055 ib_free_recv_mad(mad_recv_wc); 4056 } 4057 } 4058 4059 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 4060 struct ib_qp_attr *qp_attr, 4061 int *qp_attr_mask) 4062 { 4063 unsigned long flags; 4064 int ret; 4065 4066 spin_lock_irqsave(&cm_id_priv->lock, flags); 4067 switch (cm_id_priv->id.state) { 4068 case IB_CM_REQ_SENT: 4069 case IB_CM_MRA_REQ_RCVD: 4070 case IB_CM_REQ_RCVD: 4071 case IB_CM_MRA_REQ_SENT: 4072 case IB_CM_REP_RCVD: 4073 case IB_CM_MRA_REP_SENT: 4074 case IB_CM_REP_SENT: 4075 case IB_CM_MRA_REP_RCVD: 4076 case IB_CM_ESTABLISHED: 4077 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 4078 IB_QP_PKEY_INDEX | IB_QP_PORT; 4079 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 4080 if (cm_id_priv->responder_resources) 4081 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 4082 IB_ACCESS_REMOTE_ATOMIC; 4083 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 4084 qp_attr->port_num = cm_id_priv->av.port->port_num; 4085 ret = 0; 4086 break; 4087 default: 4088 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n", 4089 __func__, be32_to_cpu(cm_id_priv->id.local_id), 4090 cm_id_priv->id.state); 4091 ret = -EINVAL; 4092 break; 4093 } 4094 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4095 return ret; 4096 } 4097 4098 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 4099 struct ib_qp_attr *qp_attr, 4100 int *qp_attr_mask) 4101 { 4102 unsigned long flags; 4103 int ret; 4104 4105 spin_lock_irqsave(&cm_id_priv->lock, flags); 4106 switch (cm_id_priv->id.state) { 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_AV | IB_QP_PATH_MTU | 4115 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 4116 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 4117 qp_attr->path_mtu = cm_id_priv->path_mtu; 4118 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 4119 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 4120 if (cm_id_priv->qp_type == IB_QPT_RC || 4121 cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 4122 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 4123 IB_QP_MIN_RNR_TIMER; 4124 qp_attr->max_dest_rd_atomic = 4125 cm_id_priv->responder_resources; 4126 qp_attr->min_rnr_timer = 0; 4127 } 4128 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) { 4129 *qp_attr_mask |= IB_QP_ALT_PATH; 4130 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 4131 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 4132 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 4133 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 4134 } 4135 ret = 0; 4136 break; 4137 default: 4138 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n", 4139 __func__, be32_to_cpu(cm_id_priv->id.local_id), 4140 cm_id_priv->id.state); 4141 ret = -EINVAL; 4142 break; 4143 } 4144 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4145 return ret; 4146 } 4147 4148 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 4149 struct ib_qp_attr *qp_attr, 4150 int *qp_attr_mask) 4151 { 4152 unsigned long flags; 4153 int ret; 4154 4155 spin_lock_irqsave(&cm_id_priv->lock, flags); 4156 switch (cm_id_priv->id.state) { 4157 /* Allow transition to RTS before sending REP */ 4158 case IB_CM_REQ_RCVD: 4159 case IB_CM_MRA_REQ_SENT: 4160 4161 case IB_CM_REP_RCVD: 4162 case IB_CM_MRA_REP_SENT: 4163 case IB_CM_REP_SENT: 4164 case IB_CM_MRA_REP_RCVD: 4165 case IB_CM_ESTABLISHED: 4166 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 4167 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 4168 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 4169 switch (cm_id_priv->qp_type) { 4170 case IB_QPT_RC: 4171 case IB_QPT_XRC_INI: 4172 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY | 4173 IB_QP_MAX_QP_RD_ATOMIC; 4174 qp_attr->retry_cnt = cm_id_priv->retry_count; 4175 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 4176 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 4177 /* fall through */ 4178 case IB_QPT_XRC_TGT: 4179 *qp_attr_mask |= IB_QP_TIMEOUT; 4180 qp_attr->timeout = cm_id_priv->av.timeout; 4181 break; 4182 default: 4183 break; 4184 } 4185 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) { 4186 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 4187 qp_attr->path_mig_state = IB_MIG_REARM; 4188 } 4189 } else { 4190 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 4191 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 4192 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 4193 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 4194 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 4195 qp_attr->path_mig_state = IB_MIG_REARM; 4196 } 4197 ret = 0; 4198 break; 4199 default: 4200 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n", 4201 __func__, be32_to_cpu(cm_id_priv->id.local_id), 4202 cm_id_priv->id.state); 4203 ret = -EINVAL; 4204 break; 4205 } 4206 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4207 return ret; 4208 } 4209 4210 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 4211 struct ib_qp_attr *qp_attr, 4212 int *qp_attr_mask) 4213 { 4214 struct cm_id_private *cm_id_priv; 4215 int ret; 4216 4217 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 4218 switch (qp_attr->qp_state) { 4219 case IB_QPS_INIT: 4220 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 4221 break; 4222 case IB_QPS_RTR: 4223 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 4224 break; 4225 case IB_QPS_RTS: 4226 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 4227 break; 4228 default: 4229 ret = -EINVAL; 4230 break; 4231 } 4232 return ret; 4233 } 4234 EXPORT_SYMBOL(ib_cm_init_qp_attr); 4235 4236 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 4237 char *buf) 4238 { 4239 struct cm_counter_group *group; 4240 struct cm_counter_attribute *cm_attr; 4241 4242 group = container_of(obj, struct cm_counter_group, obj); 4243 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 4244 4245 return sprintf(buf, "%ld\n", 4246 atomic_long_read(&group->counter[cm_attr->index])); 4247 } 4248 4249 static const struct sysfs_ops cm_counter_ops = { 4250 .show = cm_show_counter 4251 }; 4252 4253 static struct kobj_type cm_counter_obj_type = { 4254 .sysfs_ops = &cm_counter_ops, 4255 .default_attrs = cm_counter_default_attrs 4256 }; 4257 4258 static void cm_release_port_obj(struct kobject *obj) 4259 { 4260 struct cm_port *cm_port; 4261 4262 cm_port = container_of(obj, struct cm_port, port_obj); 4263 kfree(cm_port); 4264 } 4265 4266 static struct kobj_type cm_port_obj_type = { 4267 .release = cm_release_port_obj 4268 }; 4269 4270 static char *cm_devnode(struct device *dev, umode_t *mode) 4271 { 4272 if (mode) 4273 *mode = 0666; 4274 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 4275 } 4276 4277 struct class cm_class = { 4278 .owner = THIS_MODULE, 4279 .name = "infiniband_cm", 4280 .devnode = cm_devnode, 4281 }; 4282 EXPORT_SYMBOL(cm_class); 4283 4284 static int cm_create_port_fs(struct cm_port *port) 4285 { 4286 int i, ret; 4287 4288 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type, 4289 &port->cm_dev->device->kobj, 4290 "%d", port->port_num); 4291 if (ret) { 4292 kfree(port); 4293 return ret; 4294 } 4295 4296 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 4297 ret = kobject_init_and_add(&port->counter_group[i].obj, 4298 &cm_counter_obj_type, 4299 &port->port_obj, 4300 "%s", counter_group_names[i]); 4301 if (ret) 4302 goto error; 4303 } 4304 4305 return 0; 4306 4307 error: 4308 while (i--) 4309 kobject_put(&port->counter_group[i].obj); 4310 kobject_put(&port->port_obj); 4311 return ret; 4312 4313 } 4314 4315 static void cm_remove_port_fs(struct cm_port *port) 4316 { 4317 int i; 4318 4319 for (i = 0; i < CM_COUNTER_GROUPS; i++) 4320 kobject_put(&port->counter_group[i].obj); 4321 4322 kobject_put(&port->port_obj); 4323 } 4324 4325 static void cm_add_one(struct ib_device *ib_device) 4326 { 4327 struct cm_device *cm_dev; 4328 struct cm_port *port; 4329 struct ib_mad_reg_req reg_req = { 4330 .mgmt_class = IB_MGMT_CLASS_CM, 4331 .mgmt_class_version = IB_CM_CLASS_VERSION, 4332 }; 4333 struct ib_port_modify port_modify = { 4334 .set_port_cap_mask = IB_PORT_CM_SUP 4335 }; 4336 unsigned long flags; 4337 int ret; 4338 int count = 0; 4339 u8 i; 4340 4341 cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt), 4342 GFP_KERNEL); 4343 if (!cm_dev) 4344 return; 4345 4346 cm_dev->ib_device = ib_device; 4347 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay; 4348 cm_dev->going_down = 0; 4349 cm_dev->device = device_create(&cm_class, &ib_device->dev, 4350 MKDEV(0, 0), NULL, 4351 "%s", ib_device->name); 4352 if (IS_ERR(cm_dev->device)) { 4353 kfree(cm_dev); 4354 return; 4355 } 4356 4357 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 4358 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 4359 if (!rdma_cap_ib_cm(ib_device, i)) 4360 continue; 4361 4362 port = kzalloc(sizeof *port, GFP_KERNEL); 4363 if (!port) 4364 goto error1; 4365 4366 cm_dev->port[i-1] = port; 4367 port->cm_dev = cm_dev; 4368 port->port_num = i; 4369 4370 INIT_LIST_HEAD(&port->cm_priv_prim_list); 4371 INIT_LIST_HEAD(&port->cm_priv_altr_list); 4372 4373 ret = cm_create_port_fs(port); 4374 if (ret) 4375 goto error1; 4376 4377 port->mad_agent = ib_register_mad_agent(ib_device, i, 4378 IB_QPT_GSI, 4379 ®_req, 4380 0, 4381 cm_send_handler, 4382 cm_recv_handler, 4383 port, 4384 0); 4385 if (IS_ERR(port->mad_agent)) 4386 goto error2; 4387 4388 ret = ib_modify_port(ib_device, i, 0, &port_modify); 4389 if (ret) 4390 goto error3; 4391 4392 count++; 4393 } 4394 4395 if (!count) 4396 goto free; 4397 4398 ib_set_client_data(ib_device, &cm_client, cm_dev); 4399 4400 write_lock_irqsave(&cm.device_lock, flags); 4401 list_add_tail(&cm_dev->list, &cm.device_list); 4402 write_unlock_irqrestore(&cm.device_lock, flags); 4403 return; 4404 4405 error3: 4406 ib_unregister_mad_agent(port->mad_agent); 4407 error2: 4408 cm_remove_port_fs(port); 4409 error1: 4410 port_modify.set_port_cap_mask = 0; 4411 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 4412 while (--i) { 4413 if (!rdma_cap_ib_cm(ib_device, i)) 4414 continue; 4415 4416 port = cm_dev->port[i-1]; 4417 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4418 ib_unregister_mad_agent(port->mad_agent); 4419 cm_remove_port_fs(port); 4420 } 4421 free: 4422 device_unregister(cm_dev->device); 4423 kfree(cm_dev); 4424 } 4425 4426 static void cm_remove_one(struct ib_device *ib_device, void *client_data) 4427 { 4428 struct cm_device *cm_dev = client_data; 4429 struct cm_port *port; 4430 struct cm_id_private *cm_id_priv; 4431 struct ib_mad_agent *cur_mad_agent; 4432 struct ib_port_modify port_modify = { 4433 .clr_port_cap_mask = IB_PORT_CM_SUP 4434 }; 4435 unsigned long flags; 4436 int i; 4437 4438 if (!cm_dev) 4439 return; 4440 4441 write_lock_irqsave(&cm.device_lock, flags); 4442 list_del(&cm_dev->list); 4443 write_unlock_irqrestore(&cm.device_lock, flags); 4444 4445 spin_lock_irq(&cm.lock); 4446 cm_dev->going_down = 1; 4447 spin_unlock_irq(&cm.lock); 4448 4449 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 4450 if (!rdma_cap_ib_cm(ib_device, i)) 4451 continue; 4452 4453 port = cm_dev->port[i-1]; 4454 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4455 /* Mark all the cm_id's as not valid */ 4456 spin_lock_irq(&cm.lock); 4457 list_for_each_entry(cm_id_priv, &port->cm_priv_altr_list, altr_list) 4458 cm_id_priv->altr_send_port_not_ready = 1; 4459 list_for_each_entry(cm_id_priv, &port->cm_priv_prim_list, prim_list) 4460 cm_id_priv->prim_send_port_not_ready = 1; 4461 spin_unlock_irq(&cm.lock); 4462 /* 4463 * We flush the queue here after the going_down set, this 4464 * verify that no new works will be queued in the recv handler, 4465 * after that we can call the unregister_mad_agent 4466 */ 4467 flush_workqueue(cm.wq); 4468 spin_lock_irq(&cm.state_lock); 4469 cur_mad_agent = port->mad_agent; 4470 port->mad_agent = NULL; 4471 spin_unlock_irq(&cm.state_lock); 4472 ib_unregister_mad_agent(cur_mad_agent); 4473 cm_remove_port_fs(port); 4474 } 4475 4476 device_unregister(cm_dev->device); 4477 kfree(cm_dev); 4478 } 4479 4480 static int __init ib_cm_init(void) 4481 { 4482 int ret; 4483 4484 memset(&cm, 0, sizeof cm); 4485 INIT_LIST_HEAD(&cm.device_list); 4486 rwlock_init(&cm.device_lock); 4487 spin_lock_init(&cm.lock); 4488 spin_lock_init(&cm.state_lock); 4489 cm.listen_service_table = RB_ROOT; 4490 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 4491 cm.remote_id_table = RB_ROOT; 4492 cm.remote_qp_table = RB_ROOT; 4493 cm.remote_sidr_table = RB_ROOT; 4494 idr_init(&cm.local_id_table); 4495 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 4496 INIT_LIST_HEAD(&cm.timewait_list); 4497 4498 ret = class_register(&cm_class); 4499 if (ret) { 4500 ret = -ENOMEM; 4501 goto error1; 4502 } 4503 4504 cm.wq = alloc_workqueue("ib_cm", 0, 1); 4505 if (!cm.wq) { 4506 ret = -ENOMEM; 4507 goto error2; 4508 } 4509 4510 ret = ib_register_client(&cm_client); 4511 if (ret) 4512 goto error3; 4513 4514 return 0; 4515 error3: 4516 destroy_workqueue(cm.wq); 4517 error2: 4518 class_unregister(&cm_class); 4519 error1: 4520 idr_destroy(&cm.local_id_table); 4521 return ret; 4522 } 4523 4524 static void __exit ib_cm_cleanup(void) 4525 { 4526 struct cm_timewait_info *timewait_info, *tmp; 4527 4528 spin_lock_irq(&cm.lock); 4529 list_for_each_entry(timewait_info, &cm.timewait_list, list) 4530 cancel_delayed_work(&timewait_info->work.work); 4531 spin_unlock_irq(&cm.lock); 4532 4533 ib_unregister_client(&cm_client); 4534 destroy_workqueue(cm.wq); 4535 4536 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 4537 list_del(&timewait_info->list); 4538 kfree(timewait_info); 4539 } 4540 4541 class_unregister(&cm_class); 4542 idr_destroy(&cm.local_id_table); 4543 } 4544 4545 module_init(ib_cm_init); 4546 module_exit(ib_cm_cleanup); 4547 4548