1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0 3 * 4 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved. 5 * Copyright (c) 2004 Topspin Corporation. All rights reserved. 6 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved. 7 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. 8 * 9 * This software is available to you under a choice of one of two 10 * licenses. You may choose to be licensed under the terms of the GNU 11 * General Public License (GPL) Version 2, available from the file 12 * COPYING in the main directory of this source tree, or the 13 * OpenIB.org BSD license below: 14 * 15 * Redistribution and use in source and binary forms, with or 16 * without modification, are permitted provided that the following 17 * conditions are met: 18 * 19 * - Redistributions of source code must retain the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer. 22 * 23 * - Redistributions in binary form must reproduce the above 24 * copyright notice, this list of conditions and the following 25 * disclaimer in the documentation and/or other materials 26 * provided with the distribution. 27 * 28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 29 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 30 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 31 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 32 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 33 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 34 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 35 * SOFTWARE. 36 */ 37 38 #include <sys/cdefs.h> 39 #include <linux/completion.h> 40 #include <linux/dma-mapping.h> 41 #include <linux/device.h> 42 #include <linux/module.h> 43 #include <linux/err.h> 44 #include <linux/idr.h> 45 #include <linux/interrupt.h> 46 #include <linux/random.h> 47 #include <linux/rbtree.h> 48 #include <linux/spinlock.h> 49 #include <linux/slab.h> 50 #include <linux/sysfs.h> 51 #include <linux/workqueue.h> 52 #include <linux/kdev_t.h> 53 #include <linux/etherdevice.h> 54 55 #include <asm/atomic-long.h> 56 57 #include <rdma/ib_addr.h> 58 #include <rdma/ib_cache.h> 59 #include <rdma/ib_cm.h> 60 #include "cm_msgs.h" 61 #include "core_priv.h" 62 63 MODULE_AUTHOR("Sean Hefty"); 64 MODULE_DESCRIPTION("InfiniBand CM"); 65 MODULE_LICENSE("Dual BSD/GPL"); 66 67 static const char * const ibcm_rej_reason_strs[] = { 68 [IB_CM_REJ_NO_QP] = "no QP", 69 [IB_CM_REJ_NO_EEC] = "no EEC", 70 [IB_CM_REJ_NO_RESOURCES] = "no resources", 71 [IB_CM_REJ_TIMEOUT] = "timeout", 72 [IB_CM_REJ_UNSUPPORTED] = "unsupported", 73 [IB_CM_REJ_INVALID_COMM_ID] = "invalid comm ID", 74 [IB_CM_REJ_INVALID_COMM_INSTANCE] = "invalid comm instance", 75 [IB_CM_REJ_INVALID_SERVICE_ID] = "invalid service ID", 76 [IB_CM_REJ_INVALID_TRANSPORT_TYPE] = "invalid transport type", 77 [IB_CM_REJ_STALE_CONN] = "stale conn", 78 [IB_CM_REJ_RDC_NOT_EXIST] = "RDC not exist", 79 [IB_CM_REJ_INVALID_GID] = "invalid GID", 80 [IB_CM_REJ_INVALID_LID] = "invalid LID", 81 [IB_CM_REJ_INVALID_SL] = "invalid SL", 82 [IB_CM_REJ_INVALID_TRAFFIC_CLASS] = "invalid traffic class", 83 [IB_CM_REJ_INVALID_HOP_LIMIT] = "invalid hop limit", 84 [IB_CM_REJ_INVALID_PACKET_RATE] = "invalid packet rate", 85 [IB_CM_REJ_INVALID_ALT_GID] = "invalid alt GID", 86 [IB_CM_REJ_INVALID_ALT_LID] = "invalid alt LID", 87 [IB_CM_REJ_INVALID_ALT_SL] = "invalid alt SL", 88 [IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS] = "invalid alt traffic class", 89 [IB_CM_REJ_INVALID_ALT_HOP_LIMIT] = "invalid alt hop limit", 90 [IB_CM_REJ_INVALID_ALT_PACKET_RATE] = "invalid alt packet rate", 91 [IB_CM_REJ_PORT_CM_REDIRECT] = "port CM redirect", 92 [IB_CM_REJ_PORT_REDIRECT] = "port redirect", 93 [IB_CM_REJ_INVALID_MTU] = "invalid MTU", 94 [IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES] = "insufficient resp resources", 95 [IB_CM_REJ_CONSUMER_DEFINED] = "consumer defined", 96 [IB_CM_REJ_INVALID_RNR_RETRY] = "invalid RNR retry", 97 [IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID] = "duplicate local comm ID", 98 [IB_CM_REJ_INVALID_CLASS_VERSION] = "invalid class version", 99 [IB_CM_REJ_INVALID_FLOW_LABEL] = "invalid flow label", 100 [IB_CM_REJ_INVALID_ALT_FLOW_LABEL] = "invalid alt flow label", 101 }; 102 103 const char *__attribute_const__ ibcm_reject_msg(int reason) 104 { 105 size_t index = reason; 106 107 if (index < ARRAY_SIZE(ibcm_rej_reason_strs) && 108 ibcm_rej_reason_strs[index]) 109 return ibcm_rej_reason_strs[index]; 110 else 111 return "unrecognized reason"; 112 } 113 EXPORT_SYMBOL(ibcm_reject_msg); 114 115 static void cm_add_one(struct ib_device *device); 116 static void cm_remove_one(struct ib_device *device, void *client_data); 117 118 static struct ib_client cm_client = { 119 .name = "cm", 120 .add = cm_add_one, 121 .remove = cm_remove_one 122 }; 123 124 static struct ib_cm { 125 spinlock_t lock; 126 struct list_head device_list; 127 rwlock_t device_lock; 128 struct rb_root listen_service_table; 129 u64 listen_service_id; 130 /* struct rb_root peer_service_table; todo: fix peer to peer */ 131 struct rb_root remote_qp_table; 132 struct rb_root remote_id_table; 133 struct rb_root remote_sidr_table; 134 struct idr local_id_table; 135 __be32 random_id_operand; 136 struct list_head timewait_list; 137 struct workqueue_struct *wq; 138 /* Sync on cm change port state */ 139 spinlock_t state_lock; 140 } cm; 141 142 /* Counter indexes ordered by attribute ID */ 143 enum { 144 CM_REQ_COUNTER, 145 CM_MRA_COUNTER, 146 CM_REJ_COUNTER, 147 CM_REP_COUNTER, 148 CM_RTU_COUNTER, 149 CM_DREQ_COUNTER, 150 CM_DREP_COUNTER, 151 CM_SIDR_REQ_COUNTER, 152 CM_SIDR_REP_COUNTER, 153 CM_LAP_COUNTER, 154 CM_APR_COUNTER, 155 CM_ATTR_COUNT, 156 CM_ATTR_ID_OFFSET = 0x0010, 157 }; 158 159 enum { 160 CM_XMIT, 161 CM_XMIT_RETRIES, 162 CM_RECV, 163 CM_RECV_DUPLICATES, 164 CM_COUNTER_GROUPS 165 }; 166 167 static char const counter_group_names[CM_COUNTER_GROUPS] 168 [sizeof("cm_rx_duplicates")] = { 169 "cm_tx_msgs", "cm_tx_retries", 170 "cm_rx_msgs", "cm_rx_duplicates" 171 }; 172 173 struct cm_counter_group { 174 struct kobject obj; 175 atomic_long_t counter[CM_ATTR_COUNT]; 176 }; 177 178 struct cm_counter_attribute { 179 struct attribute attr; 180 int index; 181 }; 182 183 #define CM_COUNTER_ATTR(_name, _index) \ 184 struct cm_counter_attribute cm_##_name##_counter_attr = { \ 185 .attr = { .name = __stringify(_name), .mode = 0444 }, \ 186 .index = _index \ 187 } 188 189 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER); 190 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER); 191 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER); 192 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER); 193 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER); 194 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER); 195 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER); 196 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER); 197 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER); 198 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER); 199 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER); 200 201 static struct attribute *cm_counter_default_attrs[] = { 202 &cm_req_counter_attr.attr, 203 &cm_mra_counter_attr.attr, 204 &cm_rej_counter_attr.attr, 205 &cm_rep_counter_attr.attr, 206 &cm_rtu_counter_attr.attr, 207 &cm_dreq_counter_attr.attr, 208 &cm_drep_counter_attr.attr, 209 &cm_sidr_req_counter_attr.attr, 210 &cm_sidr_rep_counter_attr.attr, 211 &cm_lap_counter_attr.attr, 212 &cm_apr_counter_attr.attr, 213 NULL 214 }; 215 216 struct cm_port { 217 struct cm_device *cm_dev; 218 struct ib_mad_agent *mad_agent; 219 struct kobject port_obj; 220 u8 port_num; 221 struct list_head cm_priv_prim_list; 222 struct list_head cm_priv_altr_list; 223 struct cm_counter_group counter_group[CM_COUNTER_GROUPS]; 224 }; 225 226 struct cm_device { 227 struct list_head list; 228 struct ib_device *ib_device; 229 u8 ack_delay; 230 int going_down; 231 struct cm_port *port[0]; 232 }; 233 234 struct cm_av { 235 struct cm_port *port; 236 union ib_gid dgid; 237 struct rdma_ah_attr ah_attr; 238 u16 pkey_index; 239 u8 timeout; 240 }; 241 242 struct cm_work { 243 struct delayed_work work; 244 struct list_head list; 245 struct cm_port *port; 246 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 247 __be32 local_id; /* Established / timewait */ 248 __be32 remote_id; 249 struct ib_cm_event cm_event; 250 struct sa_path_rec path[0]; 251 }; 252 253 struct cm_timewait_info { 254 struct cm_work work; /* Must be first. */ 255 struct list_head list; 256 struct rb_node remote_qp_node; 257 struct rb_node remote_id_node; 258 __be64 remote_ca_guid; 259 __be32 remote_qpn; 260 u8 inserted_remote_qp; 261 u8 inserted_remote_id; 262 }; 263 264 struct cm_id_private { 265 struct ib_cm_id id; 266 267 struct rb_node service_node; 268 struct rb_node sidr_id_node; 269 spinlock_t lock; /* Do not acquire inside cm.lock */ 270 struct completion comp; 271 atomic_t refcount; 272 /* Number of clients sharing this ib_cm_id. Only valid for listeners. 273 * Protected by the cm.lock spinlock. */ 274 int listen_sharecount; 275 276 struct ib_mad_send_buf *msg; 277 struct cm_timewait_info *timewait_info; 278 /* todo: use alternate port on send failure */ 279 struct cm_av av; 280 struct cm_av alt_av; 281 282 void *private_data; 283 __be64 tid; 284 __be32 local_qpn; 285 __be32 remote_qpn; 286 enum ib_qp_type qp_type; 287 __be32 sq_psn; 288 __be32 rq_psn; 289 int timeout_ms; 290 enum ib_mtu path_mtu; 291 __be16 pkey; 292 u8 private_data_len; 293 u8 max_cm_retries; 294 u8 peer_to_peer; 295 u8 responder_resources; 296 u8 initiator_depth; 297 u8 retry_count; 298 u8 rnr_retry_count; 299 u8 service_timeout; 300 u8 target_ack_delay; 301 302 struct list_head prim_list; 303 struct list_head altr_list; 304 /* Indicates that the send port mad is registered and av is set */ 305 int prim_send_port_not_ready; 306 int altr_send_port_not_ready; 307 308 struct list_head work_list; 309 atomic_t work_count; 310 }; 311 312 static void cm_work_handler(struct work_struct *work); 313 314 static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 315 { 316 if (atomic_dec_and_test(&cm_id_priv->refcount)) 317 complete(&cm_id_priv->comp); 318 } 319 320 static int cm_alloc_msg(struct cm_id_private *cm_id_priv, 321 struct ib_mad_send_buf **msg) 322 { 323 struct ib_mad_agent *mad_agent; 324 struct ib_mad_send_buf *m; 325 struct ib_ah *ah; 326 struct cm_av *av; 327 unsigned long flags, flags2; 328 int ret = 0; 329 330 /* don't let the port to be released till the agent is down */ 331 spin_lock_irqsave(&cm.state_lock, flags2); 332 spin_lock_irqsave(&cm.lock, flags); 333 if (!cm_id_priv->prim_send_port_not_ready) 334 av = &cm_id_priv->av; 335 else if (!cm_id_priv->altr_send_port_not_ready && 336 (cm_id_priv->alt_av.port)) 337 av = &cm_id_priv->alt_av; 338 else { 339 pr_info("%s: not valid CM id\n", __func__); 340 ret = -ENODEV; 341 spin_unlock_irqrestore(&cm.lock, flags); 342 goto out; 343 } 344 spin_unlock_irqrestore(&cm.lock, flags); 345 /* Make sure the port haven't released the mad yet */ 346 mad_agent = cm_id_priv->av.port->mad_agent; 347 if (!mad_agent) { 348 pr_info("%s: not a valid MAD agent\n", __func__); 349 ret = -ENODEV; 350 goto out; 351 } 352 ah = rdma_create_ah(mad_agent->qp->pd, &av->ah_attr, 0); 353 if (IS_ERR(ah)) { 354 ret = PTR_ERR(ah); 355 goto out; 356 } 357 358 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 359 av->pkey_index, 360 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 361 GFP_ATOMIC, 362 IB_MGMT_BASE_VERSION); 363 if (IS_ERR(m)) { 364 rdma_destroy_ah(ah, 0); 365 ret = PTR_ERR(m); 366 goto out; 367 } 368 369 /* Timeout set by caller if response is expected. */ 370 m->ah = ah; 371 m->retries = cm_id_priv->max_cm_retries; 372 373 atomic_inc(&cm_id_priv->refcount); 374 m->context[0] = cm_id_priv; 375 *msg = m; 376 377 out: 378 spin_unlock_irqrestore(&cm.state_lock, flags2); 379 return ret; 380 } 381 382 static struct ib_mad_send_buf *cm_alloc_response_msg_no_ah(struct cm_port *port, 383 struct ib_mad_recv_wc *mad_recv_wc) 384 { 385 return ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 386 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 387 GFP_ATOMIC, 388 IB_MGMT_BASE_VERSION); 389 } 390 391 static int cm_create_response_msg_ah(struct cm_port *port, 392 struct ib_mad_recv_wc *mad_recv_wc, 393 struct ib_mad_send_buf *msg) 394 { 395 struct ib_ah *ah; 396 397 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 398 mad_recv_wc->recv_buf.grh, port->port_num); 399 if (IS_ERR(ah)) 400 return PTR_ERR(ah); 401 402 msg->ah = ah; 403 return 0; 404 } 405 406 static void cm_free_msg(struct ib_mad_send_buf *msg) 407 { 408 if (msg->ah) 409 rdma_destroy_ah(msg->ah, 0); 410 if (msg->context[0]) 411 cm_deref_id(msg->context[0]); 412 ib_free_send_mad(msg); 413 } 414 415 static int cm_alloc_response_msg(struct cm_port *port, 416 struct ib_mad_recv_wc *mad_recv_wc, 417 struct ib_mad_send_buf **msg) 418 { 419 struct ib_mad_send_buf *m; 420 int ret; 421 422 m = cm_alloc_response_msg_no_ah(port, mad_recv_wc); 423 if (IS_ERR(m)) 424 return PTR_ERR(m); 425 426 ret = cm_create_response_msg_ah(port, mad_recv_wc, m); 427 if (ret) { 428 cm_free_msg(m); 429 return ret; 430 } 431 432 *msg = m; 433 return 0; 434 } 435 436 static void * cm_copy_private_data(const void *private_data, 437 u8 private_data_len) 438 { 439 void *data; 440 441 if (!private_data || !private_data_len) 442 return NULL; 443 444 data = kmemdup(private_data, private_data_len, GFP_KERNEL); 445 if (!data) 446 return ERR_PTR(-ENOMEM); 447 448 return data; 449 } 450 451 static void cm_set_private_data(struct cm_id_private *cm_id_priv, 452 void *private_data, u8 private_data_len) 453 { 454 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 455 kfree(cm_id_priv->private_data); 456 457 cm_id_priv->private_data = private_data; 458 cm_id_priv->private_data_len = private_data_len; 459 } 460 461 static int cm_init_av_for_lap(struct cm_port *port, struct ib_wc *wc, 462 struct ib_grh *grh, struct cm_av *av) 463 { 464 struct rdma_ah_attr new_ah_attr; 465 int ret; 466 467 av->port = port; 468 av->pkey_index = wc->pkey_index; 469 470 /* 471 * av->ah_attr might be initialized based on past wc during incoming 472 * connect request or while sending out connect request. So initialize 473 * a new ah_attr on stack. If initialization fails, old ah_attr is 474 * used for sending any responses. If initialization is successful, 475 * than new ah_attr is used by overwriting old one. 476 */ 477 ret = ib_init_ah_attr_from_wc(port->cm_dev->ib_device, 478 port->port_num, wc, 479 grh, &new_ah_attr); 480 if (ret) 481 return ret; 482 483 rdma_move_ah_attr(&av->ah_attr, &new_ah_attr); 484 return 0; 485 } 486 487 static int cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 488 struct ib_grh *grh, struct cm_av *av) 489 { 490 av->port = port; 491 av->pkey_index = wc->pkey_index; 492 return ib_init_ah_attr_from_wc(port->cm_dev->ib_device, 493 port->port_num, wc, 494 grh, &av->ah_attr); 495 } 496 497 static int add_cm_id_to_port_list(struct cm_id_private *cm_id_priv, 498 struct cm_av *av, 499 struct cm_port *port) 500 { 501 unsigned long flags; 502 int ret = 0; 503 504 spin_lock_irqsave(&cm.lock, flags); 505 506 if (&cm_id_priv->av == av) 507 list_add_tail(&cm_id_priv->prim_list, &port->cm_priv_prim_list); 508 else if (&cm_id_priv->alt_av == av) 509 list_add_tail(&cm_id_priv->altr_list, &port->cm_priv_altr_list); 510 else 511 ret = -EINVAL; 512 513 spin_unlock_irqrestore(&cm.lock, flags); 514 return ret; 515 } 516 517 static struct cm_port * 518 get_cm_port_from_path(struct sa_path_rec *path, const struct ib_gid_attr *attr) 519 { 520 struct cm_device *cm_dev; 521 struct cm_port *port = NULL; 522 unsigned long flags; 523 524 if (attr) { 525 read_lock_irqsave(&cm.device_lock, flags); 526 list_for_each_entry(cm_dev, &cm.device_list, list) { 527 if (cm_dev->ib_device == attr->device) { 528 port = cm_dev->port[attr->port_num - 1]; 529 break; 530 } 531 } 532 read_unlock_irqrestore(&cm.device_lock, flags); 533 } else { 534 /* SGID attribute can be NULL in following 535 * conditions. 536 * (a) Alternative path 537 * (b) IB link layer without GRH 538 * (c) LAP send messages 539 */ 540 read_lock_irqsave(&cm.device_lock, flags); 541 list_for_each_entry(cm_dev, &cm.device_list, list) { 542 attr = rdma_find_gid(cm_dev->ib_device, 543 &path->sgid, 544 sa_conv_pathrec_to_gid_type(path), 545 NULL); 546 if (!IS_ERR(attr)) { 547 port = cm_dev->port[attr->port_num - 1]; 548 break; 549 } 550 } 551 read_unlock_irqrestore(&cm.device_lock, flags); 552 if (port) 553 rdma_put_gid_attr(attr); 554 } 555 return port; 556 } 557 558 static int cm_init_av_by_path(struct sa_path_rec *path, 559 const struct ib_gid_attr *sgid_attr, 560 struct cm_av *av, 561 struct cm_id_private *cm_id_priv) 562 { 563 struct rdma_ah_attr new_ah_attr; 564 struct cm_device *cm_dev; 565 struct cm_port *port; 566 int ret; 567 568 port = get_cm_port_from_path(path, sgid_attr); 569 if (!port) 570 return -EINVAL; 571 cm_dev = port->cm_dev; 572 573 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num, 574 be16_to_cpu(path->pkey), &av->pkey_index); 575 if (ret) 576 return ret; 577 578 av->port = port; 579 580 /* 581 * av->ah_attr might be initialized based on wc or during 582 * request processing time which might have reference to sgid_attr. 583 * So initialize a new ah_attr on stack. 584 * If initialization fails, old ah_attr is used for sending any 585 * responses. If initialization is successful, than new ah_attr 586 * is used by overwriting the old one. So that right ah_attr 587 * can be used to return an error response. 588 */ 589 ret = ib_init_ah_attr_from_path(cm_dev->ib_device, port->port_num, path, 590 &new_ah_attr, sgid_attr); 591 if (ret) 592 return ret; 593 594 av->timeout = path->packet_life_time + 1; 595 596 ret = add_cm_id_to_port_list(cm_id_priv, av, port); 597 if (ret) { 598 rdma_destroy_ah_attr(&new_ah_attr); 599 return ret; 600 } 601 rdma_move_ah_attr(&av->ah_attr, &new_ah_attr); 602 return 0; 603 } 604 605 static int cm_alloc_id(struct cm_id_private *cm_id_priv) 606 { 607 unsigned long flags; 608 int id; 609 610 idr_preload(GFP_KERNEL); 611 spin_lock_irqsave(&cm.lock, flags); 612 613 id = idr_alloc_cyclic(&cm.local_id_table, cm_id_priv, 0, 0, GFP_NOWAIT); 614 615 spin_unlock_irqrestore(&cm.lock, flags); 616 idr_preload_end(); 617 618 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand; 619 return id < 0 ? id : 0; 620 } 621 622 static void cm_free_id(__be32 local_id) 623 { 624 spin_lock_irq(&cm.lock); 625 idr_remove(&cm.local_id_table, 626 (__force int) (local_id ^ cm.random_id_operand)); 627 spin_unlock_irq(&cm.lock); 628 } 629 630 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id) 631 { 632 struct cm_id_private *cm_id_priv; 633 634 cm_id_priv = idr_find(&cm.local_id_table, 635 (__force int) (local_id ^ cm.random_id_operand)); 636 if (cm_id_priv) { 637 if (cm_id_priv->id.remote_id == remote_id) 638 atomic_inc(&cm_id_priv->refcount); 639 else 640 cm_id_priv = NULL; 641 } 642 643 return cm_id_priv; 644 } 645 646 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id) 647 { 648 struct cm_id_private *cm_id_priv; 649 650 spin_lock_irq(&cm.lock); 651 cm_id_priv = cm_get_id(local_id, remote_id); 652 spin_unlock_irq(&cm.lock); 653 654 return cm_id_priv; 655 } 656 657 /* 658 * Trivial helpers to strip endian annotation and compare; the 659 * endianness doesn't actually matter since we just need a stable 660 * order for the RB tree. 661 */ 662 static int be32_lt(__be32 a, __be32 b) 663 { 664 return (__force u32) a < (__force u32) b; 665 } 666 667 static int be32_gt(__be32 a, __be32 b) 668 { 669 return (__force u32) a > (__force u32) b; 670 } 671 672 static int be64_lt(__be64 a, __be64 b) 673 { 674 return (__force u64) a < (__force u64) b; 675 } 676 677 static int be64_gt(__be64 a, __be64 b) 678 { 679 return (__force u64) a > (__force u64) b; 680 } 681 682 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv) 683 { 684 struct rb_node **link = &cm.listen_service_table.rb_node; 685 struct rb_node *parent = NULL; 686 struct cm_id_private *cur_cm_id_priv; 687 __be64 service_id = cm_id_priv->id.service_id; 688 __be64 service_mask = cm_id_priv->id.service_mask; 689 690 while (*link) { 691 parent = *link; 692 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 693 service_node); 694 if ((cur_cm_id_priv->id.service_mask & service_id) == 695 (service_mask & cur_cm_id_priv->id.service_id) && 696 (cm_id_priv->id.device == cur_cm_id_priv->id.device)) 697 return cur_cm_id_priv; 698 699 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 700 link = &(*link)->rb_left; 701 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 702 link = &(*link)->rb_right; 703 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id)) 704 link = &(*link)->rb_left; 705 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id)) 706 link = &(*link)->rb_right; 707 else 708 link = &(*link)->rb_right; 709 } 710 rb_link_node(&cm_id_priv->service_node, parent, link); 711 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 712 return NULL; 713 } 714 715 static struct cm_id_private * cm_find_listen(struct ib_device *device, 716 __be64 service_id) 717 { 718 struct rb_node *node = cm.listen_service_table.rb_node; 719 struct cm_id_private *cm_id_priv; 720 721 while (node) { 722 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 723 if ((cm_id_priv->id.service_mask & service_id) == 724 cm_id_priv->id.service_id && 725 (cm_id_priv->id.device == device)) 726 return cm_id_priv; 727 728 if (device < cm_id_priv->id.device) 729 node = node->rb_left; 730 else if (device > cm_id_priv->id.device) 731 node = node->rb_right; 732 else if (be64_lt(service_id, cm_id_priv->id.service_id)) 733 node = node->rb_left; 734 else if (be64_gt(service_id, cm_id_priv->id.service_id)) 735 node = node->rb_right; 736 else 737 node = node->rb_right; 738 } 739 return NULL; 740 } 741 742 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info 743 *timewait_info) 744 { 745 struct rb_node **link = &cm.remote_id_table.rb_node; 746 struct rb_node *parent = NULL; 747 struct cm_timewait_info *cur_timewait_info; 748 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 749 __be32 remote_id = timewait_info->work.remote_id; 750 751 while (*link) { 752 parent = *link; 753 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 754 remote_id_node); 755 if (be32_lt(remote_id, cur_timewait_info->work.remote_id)) 756 link = &(*link)->rb_left; 757 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id)) 758 link = &(*link)->rb_right; 759 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 760 link = &(*link)->rb_left; 761 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 762 link = &(*link)->rb_right; 763 else 764 return cur_timewait_info; 765 } 766 timewait_info->inserted_remote_id = 1; 767 rb_link_node(&timewait_info->remote_id_node, parent, link); 768 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 769 return NULL; 770 } 771 772 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid, 773 __be32 remote_id) 774 { 775 struct rb_node *node = cm.remote_id_table.rb_node; 776 struct cm_timewait_info *timewait_info; 777 778 while (node) { 779 timewait_info = rb_entry(node, struct cm_timewait_info, 780 remote_id_node); 781 if (be32_lt(remote_id, timewait_info->work.remote_id)) 782 node = node->rb_left; 783 else if (be32_gt(remote_id, timewait_info->work.remote_id)) 784 node = node->rb_right; 785 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid)) 786 node = node->rb_left; 787 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid)) 788 node = node->rb_right; 789 else 790 return timewait_info; 791 } 792 return NULL; 793 } 794 795 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info 796 *timewait_info) 797 { 798 struct rb_node **link = &cm.remote_qp_table.rb_node; 799 struct rb_node *parent = NULL; 800 struct cm_timewait_info *cur_timewait_info; 801 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 802 __be32 remote_qpn = timewait_info->remote_qpn; 803 804 while (*link) { 805 parent = *link; 806 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 807 remote_qp_node); 808 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn)) 809 link = &(*link)->rb_left; 810 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn)) 811 link = &(*link)->rb_right; 812 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 813 link = &(*link)->rb_left; 814 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 815 link = &(*link)->rb_right; 816 else 817 return cur_timewait_info; 818 } 819 timewait_info->inserted_remote_qp = 1; 820 rb_link_node(&timewait_info->remote_qp_node, parent, link); 821 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 822 return NULL; 823 } 824 825 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private 826 *cm_id_priv) 827 { 828 struct rb_node **link = &cm.remote_sidr_table.rb_node; 829 struct rb_node *parent = NULL; 830 struct cm_id_private *cur_cm_id_priv; 831 union ib_gid *port_gid = &cm_id_priv->av.dgid; 832 __be32 remote_id = cm_id_priv->id.remote_id; 833 834 while (*link) { 835 parent = *link; 836 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 837 sidr_id_node); 838 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id)) 839 link = &(*link)->rb_left; 840 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id)) 841 link = &(*link)->rb_right; 842 else { 843 int cmp; 844 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, 845 sizeof *port_gid); 846 if (cmp < 0) 847 link = &(*link)->rb_left; 848 else if (cmp > 0) 849 link = &(*link)->rb_right; 850 else 851 return cur_cm_id_priv; 852 } 853 } 854 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 855 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 856 return NULL; 857 } 858 859 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv, 860 enum ib_cm_sidr_status status) 861 { 862 struct ib_cm_sidr_rep_param param; 863 864 memset(¶m, 0, sizeof param); 865 param.status = status; 866 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m); 867 } 868 869 struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 870 ib_cm_handler cm_handler, 871 void *context) 872 { 873 struct cm_id_private *cm_id_priv; 874 int ret; 875 876 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 877 if (!cm_id_priv) 878 return ERR_PTR(-ENOMEM); 879 880 cm_id_priv->id.state = IB_CM_IDLE; 881 cm_id_priv->id.device = device; 882 cm_id_priv->id.cm_handler = cm_handler; 883 cm_id_priv->id.context = context; 884 cm_id_priv->id.remote_cm_qpn = 1; 885 ret = cm_alloc_id(cm_id_priv); 886 if (ret) 887 goto error; 888 889 spin_lock_init(&cm_id_priv->lock); 890 init_completion(&cm_id_priv->comp); 891 INIT_LIST_HEAD(&cm_id_priv->work_list); 892 INIT_LIST_HEAD(&cm_id_priv->prim_list); 893 INIT_LIST_HEAD(&cm_id_priv->altr_list); 894 atomic_set(&cm_id_priv->work_count, -1); 895 atomic_set(&cm_id_priv->refcount, 1); 896 return &cm_id_priv->id; 897 898 error: 899 kfree(cm_id_priv); 900 return ERR_PTR(-ENOMEM); 901 } 902 EXPORT_SYMBOL(ib_create_cm_id); 903 904 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 905 { 906 struct cm_work *work; 907 908 if (list_empty(&cm_id_priv->work_list)) 909 return NULL; 910 911 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 912 list_del(&work->list); 913 return work; 914 } 915 916 static void cm_free_work(struct cm_work *work) 917 { 918 if (work->mad_recv_wc) 919 ib_free_recv_mad(work->mad_recv_wc); 920 kfree(work); 921 } 922 923 static inline int cm_convert_to_ms(int iba_time) 924 { 925 /* approximate conversion to ms from 4.096us x 2^iba_time */ 926 return 1 << max(iba_time - 8, 0); 927 } 928 929 /* 930 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 931 * Because of how ack_timeout is stored, adding one doubles the timeout. 932 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 933 * increment it (round up) only if the other is within 50%. 934 */ 935 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 936 { 937 int ack_timeout = packet_life_time + 1; 938 939 if (ack_timeout >= ca_ack_delay) 940 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 941 else 942 ack_timeout = ca_ack_delay + 943 (ack_timeout >= (ca_ack_delay - 1)); 944 945 return min(31, ack_timeout); 946 } 947 948 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info) 949 { 950 if (timewait_info->inserted_remote_id) { 951 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 952 timewait_info->inserted_remote_id = 0; 953 } 954 955 if (timewait_info->inserted_remote_qp) { 956 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 957 timewait_info->inserted_remote_qp = 0; 958 } 959 } 960 961 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 962 { 963 struct cm_timewait_info *timewait_info; 964 965 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 966 if (!timewait_info) 967 return ERR_PTR(-ENOMEM); 968 969 timewait_info->work.local_id = local_id; 970 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 971 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 972 return timewait_info; 973 } 974 975 static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 976 { 977 int wait_time; 978 unsigned long flags; 979 struct cm_device *cm_dev; 980 981 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client); 982 if (!cm_dev) 983 return; 984 985 spin_lock_irqsave(&cm.lock, flags); 986 cm_cleanup_timewait(cm_id_priv->timewait_info); 987 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 988 spin_unlock_irqrestore(&cm.lock, flags); 989 990 /* 991 * The cm_id could be destroyed by the user before we exit timewait. 992 * To protect against this, we search for the cm_id after exiting 993 * timewait before notifying the user that we've exited timewait. 994 */ 995 cm_id_priv->id.state = IB_CM_TIMEWAIT; 996 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 997 998 /* Check if the device started its remove_one */ 999 spin_lock_irqsave(&cm.lock, flags); 1000 if (!cm_dev->going_down) 1001 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 1002 msecs_to_jiffies(wait_time)); 1003 spin_unlock_irqrestore(&cm.lock, flags); 1004 1005 cm_id_priv->timewait_info = NULL; 1006 } 1007 1008 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 1009 { 1010 unsigned long flags; 1011 1012 cm_id_priv->id.state = IB_CM_IDLE; 1013 if (cm_id_priv->timewait_info) { 1014 spin_lock_irqsave(&cm.lock, flags); 1015 cm_cleanup_timewait(cm_id_priv->timewait_info); 1016 spin_unlock_irqrestore(&cm.lock, flags); 1017 kfree(cm_id_priv->timewait_info); 1018 cm_id_priv->timewait_info = NULL; 1019 } 1020 } 1021 1022 static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 1023 { 1024 struct cm_id_private *cm_id_priv; 1025 struct cm_work *work; 1026 1027 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1028 retest: 1029 spin_lock_irq(&cm_id_priv->lock); 1030 switch (cm_id->state) { 1031 case IB_CM_LISTEN: 1032 spin_unlock_irq(&cm_id_priv->lock); 1033 1034 spin_lock_irq(&cm.lock); 1035 if (--cm_id_priv->listen_sharecount > 0) { 1036 /* The id is still shared. */ 1037 cm_deref_id(cm_id_priv); 1038 spin_unlock_irq(&cm.lock); 1039 return; 1040 } 1041 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 1042 spin_unlock_irq(&cm.lock); 1043 break; 1044 case IB_CM_SIDR_REQ_SENT: 1045 cm_id->state = IB_CM_IDLE; 1046 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1047 spin_unlock_irq(&cm_id_priv->lock); 1048 break; 1049 case IB_CM_SIDR_REQ_RCVD: 1050 spin_unlock_irq(&cm_id_priv->lock); 1051 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); 1052 spin_lock_irq(&cm.lock); 1053 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) 1054 rb_erase(&cm_id_priv->sidr_id_node, 1055 &cm.remote_sidr_table); 1056 spin_unlock_irq(&cm.lock); 1057 break; 1058 case IB_CM_REQ_SENT: 1059 case IB_CM_MRA_REQ_RCVD: 1060 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1061 spin_unlock_irq(&cm_id_priv->lock); 1062 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 1063 &cm_id_priv->id.device->node_guid, 1064 sizeof cm_id_priv->id.device->node_guid, 1065 NULL, 0); 1066 break; 1067 case IB_CM_REQ_RCVD: 1068 if (err == -ENOMEM) { 1069 /* Do not reject to allow future retries. */ 1070 cm_reset_to_idle(cm_id_priv); 1071 spin_unlock_irq(&cm_id_priv->lock); 1072 } else { 1073 spin_unlock_irq(&cm_id_priv->lock); 1074 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 1075 NULL, 0, NULL, 0); 1076 } 1077 break; 1078 case IB_CM_REP_SENT: 1079 case IB_CM_MRA_REP_RCVD: 1080 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1081 /* Fall through */ 1082 case IB_CM_MRA_REQ_SENT: 1083 case IB_CM_REP_RCVD: 1084 case IB_CM_MRA_REP_SENT: 1085 spin_unlock_irq(&cm_id_priv->lock); 1086 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 1087 NULL, 0, NULL, 0); 1088 break; 1089 case IB_CM_ESTABLISHED: 1090 spin_unlock_irq(&cm_id_priv->lock); 1091 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) 1092 break; 1093 ib_send_cm_dreq(cm_id, NULL, 0); 1094 goto retest; 1095 case IB_CM_DREQ_SENT: 1096 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1097 cm_enter_timewait(cm_id_priv); 1098 spin_unlock_irq(&cm_id_priv->lock); 1099 break; 1100 case IB_CM_DREQ_RCVD: 1101 spin_unlock_irq(&cm_id_priv->lock); 1102 ib_send_cm_drep(cm_id, NULL, 0); 1103 break; 1104 default: 1105 spin_unlock_irq(&cm_id_priv->lock); 1106 break; 1107 } 1108 1109 spin_lock_irq(&cm.lock); 1110 if (!list_empty(&cm_id_priv->altr_list) && 1111 (!cm_id_priv->altr_send_port_not_ready)) 1112 list_del(&cm_id_priv->altr_list); 1113 if (!list_empty(&cm_id_priv->prim_list) && 1114 (!cm_id_priv->prim_send_port_not_ready)) 1115 list_del(&cm_id_priv->prim_list); 1116 spin_unlock_irq(&cm.lock); 1117 1118 cm_free_id(cm_id->local_id); 1119 cm_deref_id(cm_id_priv); 1120 wait_for_completion(&cm_id_priv->comp); 1121 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 1122 cm_free_work(work); 1123 1124 rdma_destroy_ah_attr(&cm_id_priv->av.ah_attr); 1125 rdma_destroy_ah_attr(&cm_id_priv->alt_av.ah_attr); 1126 kfree(cm_id_priv->private_data); 1127 kfree(cm_id_priv); 1128 } 1129 1130 void ib_destroy_cm_id(struct ib_cm_id *cm_id) 1131 { 1132 cm_destroy_id(cm_id, 0); 1133 } 1134 EXPORT_SYMBOL(ib_destroy_cm_id); 1135 1136 /** 1137 * __ib_cm_listen - Initiates listening on the specified service ID for 1138 * connection and service ID resolution requests. 1139 * @cm_id: Connection identifier associated with the listen request. 1140 * @service_id: Service identifier matched against incoming connection 1141 * and service ID resolution requests. The service ID should be specified 1142 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1143 * assign a service ID to the caller. 1144 * @service_mask: Mask applied to service ID used to listen across a 1145 * range of service IDs. If set to 0, the service ID is matched 1146 * exactly. This parameter is ignored if %service_id is set to 1147 * IB_CM_ASSIGN_SERVICE_ID. 1148 */ 1149 static int __ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, 1150 __be64 service_mask) 1151 { 1152 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 1153 int ret = 0; 1154 1155 service_mask = service_mask ? service_mask : ~cpu_to_be64(0); 1156 service_id &= service_mask; 1157 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 1158 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 1159 return -EINVAL; 1160 1161 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1162 if (cm_id->state != IB_CM_IDLE) 1163 return -EINVAL; 1164 1165 cm_id->state = IB_CM_LISTEN; 1166 ++cm_id_priv->listen_sharecount; 1167 1168 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 1169 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 1170 cm_id->service_mask = ~cpu_to_be64(0); 1171 } else { 1172 cm_id->service_id = service_id; 1173 cm_id->service_mask = service_mask; 1174 } 1175 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 1176 1177 if (cur_cm_id_priv) { 1178 cm_id->state = IB_CM_IDLE; 1179 --cm_id_priv->listen_sharecount; 1180 ret = -EBUSY; 1181 } 1182 return ret; 1183 } 1184 1185 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask) 1186 { 1187 unsigned long flags; 1188 int ret; 1189 1190 spin_lock_irqsave(&cm.lock, flags); 1191 ret = __ib_cm_listen(cm_id, service_id, service_mask); 1192 spin_unlock_irqrestore(&cm.lock, flags); 1193 1194 return ret; 1195 } 1196 EXPORT_SYMBOL(ib_cm_listen); 1197 1198 /** 1199 * Create a new listening ib_cm_id and listen on the given service ID. 1200 * 1201 * If there's an existing ID listening on that same device and service ID, 1202 * return it. 1203 * 1204 * @device: Device associated with the cm_id. All related communication will 1205 * be associated with the specified device. 1206 * @cm_handler: Callback invoked to notify the user of CM events. 1207 * @service_id: Service identifier matched against incoming connection 1208 * and service ID resolution requests. The service ID should be specified 1209 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1210 * assign a service ID to the caller. 1211 * 1212 * Callers should call ib_destroy_cm_id when done with the listener ID. 1213 */ 1214 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device, 1215 ib_cm_handler cm_handler, 1216 __be64 service_id) 1217 { 1218 struct cm_id_private *cm_id_priv; 1219 struct ib_cm_id *cm_id; 1220 unsigned long flags; 1221 int err = 0; 1222 1223 /* Create an ID in advance, since the creation may sleep */ 1224 cm_id = ib_create_cm_id(device, cm_handler, NULL); 1225 if (IS_ERR(cm_id)) 1226 return cm_id; 1227 1228 spin_lock_irqsave(&cm.lock, flags); 1229 1230 if (service_id == IB_CM_ASSIGN_SERVICE_ID) 1231 goto new_id; 1232 1233 /* Find an existing ID */ 1234 cm_id_priv = cm_find_listen(device, service_id); 1235 if (cm_id_priv) { 1236 if (cm_id->cm_handler != cm_handler || cm_id->context) { 1237 /* Sharing an ib_cm_id with different handlers is not 1238 * supported */ 1239 spin_unlock_irqrestore(&cm.lock, flags); 1240 ib_destroy_cm_id(cm_id); 1241 return ERR_PTR(-EINVAL); 1242 } 1243 atomic_inc(&cm_id_priv->refcount); 1244 ++cm_id_priv->listen_sharecount; 1245 spin_unlock_irqrestore(&cm.lock, flags); 1246 1247 ib_destroy_cm_id(cm_id); 1248 cm_id = &cm_id_priv->id; 1249 return cm_id; 1250 } 1251 1252 new_id: 1253 /* Use newly created ID */ 1254 err = __ib_cm_listen(cm_id, service_id, 0); 1255 1256 spin_unlock_irqrestore(&cm.lock, flags); 1257 1258 if (err) { 1259 ib_destroy_cm_id(cm_id); 1260 return ERR_PTR(err); 1261 } 1262 return cm_id; 1263 } 1264 EXPORT_SYMBOL(ib_cm_insert_listen); 1265 1266 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv) 1267 { 1268 u64 hi_tid, low_tid; 1269 1270 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 1271 low_tid = (u64)cm_id_priv->id.local_id; 1272 return cpu_to_be64(hi_tid | low_tid); 1273 } 1274 1275 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 1276 __be16 attr_id, __be64 tid) 1277 { 1278 hdr->base_version = IB_MGMT_BASE_VERSION; 1279 hdr->mgmt_class = IB_MGMT_CLASS_CM; 1280 hdr->class_version = IB_CM_CLASS_VERSION; 1281 hdr->method = IB_MGMT_METHOD_SEND; 1282 hdr->attr_id = attr_id; 1283 hdr->tid = tid; 1284 } 1285 1286 static void cm_format_req(struct cm_req_msg *req_msg, 1287 struct cm_id_private *cm_id_priv, 1288 struct ib_cm_req_param *param) 1289 { 1290 struct sa_path_rec *pri_path = param->primary_path; 1291 struct sa_path_rec *alt_path = param->alternate_path; 1292 bool pri_ext = false; 1293 1294 if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA) 1295 pri_ext = opa_is_extended_lid(pri_path->opa.dlid, 1296 pri_path->opa.slid); 1297 1298 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1299 cm_form_tid(cm_id_priv)); 1300 1301 req_msg->local_comm_id = cm_id_priv->id.local_id; 1302 req_msg->service_id = param->service_id; 1303 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1304 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 1305 cm_req_set_init_depth(req_msg, param->initiator_depth); 1306 cm_req_set_remote_resp_timeout(req_msg, 1307 param->remote_cm_response_timeout); 1308 cm_req_set_qp_type(req_msg, param->qp_type); 1309 cm_req_set_flow_ctrl(req_msg, param->flow_control); 1310 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 1311 cm_req_set_local_resp_timeout(req_msg, 1312 param->local_cm_response_timeout); 1313 req_msg->pkey = param->primary_path->pkey; 1314 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 1315 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 1316 1317 if (param->qp_type != IB_QPT_XRC_INI) { 1318 cm_req_set_resp_res(req_msg, param->responder_resources); 1319 cm_req_set_retry_count(req_msg, param->retry_count); 1320 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 1321 cm_req_set_srq(req_msg, param->srq); 1322 } 1323 1324 req_msg->primary_local_gid = pri_path->sgid; 1325 req_msg->primary_remote_gid = pri_path->dgid; 1326 if (pri_ext) { 1327 req_msg->primary_local_gid.global.interface_id 1328 = OPA_MAKE_ID(be32_to_cpu(pri_path->opa.slid)); 1329 req_msg->primary_remote_gid.global.interface_id 1330 = OPA_MAKE_ID(be32_to_cpu(pri_path->opa.dlid)); 1331 } 1332 if (pri_path->hop_limit <= 1) { 1333 req_msg->primary_local_lid = pri_ext ? 0 : 1334 htons(ntohl(sa_path_get_slid(pri_path))); 1335 req_msg->primary_remote_lid = pri_ext ? 0 : 1336 htons(ntohl(sa_path_get_dlid(pri_path))); 1337 } else { 1338 /* Work-around until there's a way to obtain remote LID info */ 1339 req_msg->primary_local_lid = IB_LID_PERMISSIVE; 1340 req_msg->primary_remote_lid = IB_LID_PERMISSIVE; 1341 } 1342 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label); 1343 cm_req_set_primary_packet_rate(req_msg, pri_path->rate); 1344 req_msg->primary_traffic_class = pri_path->traffic_class; 1345 req_msg->primary_hop_limit = pri_path->hop_limit; 1346 cm_req_set_primary_sl(req_msg, pri_path->sl); 1347 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1)); 1348 cm_req_set_primary_local_ack_timeout(req_msg, 1349 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1350 pri_path->packet_life_time)); 1351 1352 if (alt_path) { 1353 bool alt_ext = false; 1354 1355 if (alt_path->rec_type == SA_PATH_REC_TYPE_OPA) 1356 alt_ext = opa_is_extended_lid(alt_path->opa.dlid, 1357 alt_path->opa.slid); 1358 1359 req_msg->alt_local_gid = alt_path->sgid; 1360 req_msg->alt_remote_gid = alt_path->dgid; 1361 if (alt_ext) { 1362 req_msg->alt_local_gid.global.interface_id 1363 = OPA_MAKE_ID(be32_to_cpu(alt_path->opa.slid)); 1364 req_msg->alt_remote_gid.global.interface_id 1365 = OPA_MAKE_ID(be32_to_cpu(alt_path->opa.dlid)); 1366 } 1367 if (alt_path->hop_limit <= 1) { 1368 req_msg->alt_local_lid = alt_ext ? 0 : 1369 htons(ntohl(sa_path_get_slid(alt_path))); 1370 req_msg->alt_remote_lid = alt_ext ? 0 : 1371 htons(ntohl(sa_path_get_dlid(alt_path))); 1372 } else { 1373 req_msg->alt_local_lid = IB_LID_PERMISSIVE; 1374 req_msg->alt_remote_lid = IB_LID_PERMISSIVE; 1375 } 1376 cm_req_set_alt_flow_label(req_msg, 1377 alt_path->flow_label); 1378 cm_req_set_alt_packet_rate(req_msg, alt_path->rate); 1379 req_msg->alt_traffic_class = alt_path->traffic_class; 1380 req_msg->alt_hop_limit = alt_path->hop_limit; 1381 cm_req_set_alt_sl(req_msg, alt_path->sl); 1382 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1)); 1383 cm_req_set_alt_local_ack_timeout(req_msg, 1384 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1385 alt_path->packet_life_time)); 1386 } 1387 1388 if (param->private_data && param->private_data_len) 1389 memcpy(req_msg->private_data, param->private_data, 1390 param->private_data_len); 1391 } 1392 1393 static int cm_validate_req_param(struct ib_cm_req_param *param) 1394 { 1395 /* peer-to-peer not supported */ 1396 if (param->peer_to_peer) 1397 return -EINVAL; 1398 1399 if (!param->primary_path) 1400 return -EINVAL; 1401 1402 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC && 1403 param->qp_type != IB_QPT_XRC_INI) 1404 return -EINVAL; 1405 1406 if (param->private_data && 1407 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1408 return -EINVAL; 1409 1410 if (param->alternate_path && 1411 (param->alternate_path->pkey != param->primary_path->pkey || 1412 param->alternate_path->mtu != param->primary_path->mtu)) 1413 return -EINVAL; 1414 1415 return 0; 1416 } 1417 1418 int ib_send_cm_req(struct ib_cm_id *cm_id, 1419 struct ib_cm_req_param *param) 1420 { 1421 struct cm_id_private *cm_id_priv; 1422 struct cm_req_msg *req_msg; 1423 unsigned long flags; 1424 int ret; 1425 1426 ret = cm_validate_req_param(param); 1427 if (ret) 1428 return ret; 1429 1430 /* Verify that we're not in timewait. */ 1431 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1432 spin_lock_irqsave(&cm_id_priv->lock, flags); 1433 if (cm_id->state != IB_CM_IDLE) { 1434 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1435 ret = -EINVAL; 1436 goto out; 1437 } 1438 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1439 1440 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1441 id.local_id); 1442 if (IS_ERR(cm_id_priv->timewait_info)) { 1443 ret = PTR_ERR(cm_id_priv->timewait_info); 1444 goto out; 1445 } 1446 1447 ret = cm_init_av_by_path(param->primary_path, 1448 param->ppath_sgid_attr, &cm_id_priv->av, 1449 cm_id_priv); 1450 if (ret) 1451 goto error1; 1452 if (param->alternate_path) { 1453 ret = cm_init_av_by_path(param->alternate_path, NULL, 1454 &cm_id_priv->alt_av, cm_id_priv); 1455 if (ret) 1456 goto error1; 1457 } 1458 cm_id->service_id = param->service_id; 1459 cm_id->service_mask = ~cpu_to_be64(0); 1460 cm_id_priv->timeout_ms = cm_convert_to_ms( 1461 param->primary_path->packet_life_time) * 2 + 1462 cm_convert_to_ms( 1463 param->remote_cm_response_timeout); 1464 cm_id_priv->max_cm_retries = param->max_cm_retries; 1465 cm_id_priv->initiator_depth = param->initiator_depth; 1466 cm_id_priv->responder_resources = param->responder_resources; 1467 cm_id_priv->retry_count = param->retry_count; 1468 cm_id_priv->path_mtu = param->primary_path->mtu; 1469 cm_id_priv->pkey = param->primary_path->pkey; 1470 cm_id_priv->qp_type = param->qp_type; 1471 1472 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1473 if (ret) 1474 goto error1; 1475 1476 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1477 cm_format_req(req_msg, cm_id_priv, param); 1478 cm_id_priv->tid = req_msg->hdr.tid; 1479 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1480 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1481 1482 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1483 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1484 1485 spin_lock_irqsave(&cm_id_priv->lock, flags); 1486 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1487 if (ret) { 1488 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1489 goto error2; 1490 } 1491 BUG_ON(cm_id->state != IB_CM_IDLE); 1492 cm_id->state = IB_CM_REQ_SENT; 1493 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1494 return 0; 1495 1496 error2: cm_free_msg(cm_id_priv->msg); 1497 error1: kfree(cm_id_priv->timewait_info); 1498 out: return ret; 1499 } 1500 EXPORT_SYMBOL(ib_send_cm_req); 1501 1502 static int cm_issue_rej(struct cm_port *port, 1503 struct ib_mad_recv_wc *mad_recv_wc, 1504 enum ib_cm_rej_reason reason, 1505 enum cm_msg_response msg_rejected, 1506 void *ari, u8 ari_length) 1507 { 1508 struct ib_mad_send_buf *msg = NULL; 1509 struct cm_rej_msg *rej_msg, *rcv_msg; 1510 int ret; 1511 1512 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1513 if (ret) 1514 return ret; 1515 1516 /* We just need common CM header information. Cast to any message. */ 1517 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1518 rej_msg = (struct cm_rej_msg *) msg->mad; 1519 1520 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1521 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1522 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1523 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1524 rej_msg->reason = cpu_to_be16(reason); 1525 1526 if (ari && ari_length) { 1527 cm_rej_set_reject_info_len(rej_msg, ari_length); 1528 memcpy(rej_msg->ari, ari, ari_length); 1529 } 1530 1531 ret = ib_post_send_mad(msg, NULL); 1532 if (ret) 1533 cm_free_msg(msg); 1534 1535 return ret; 1536 } 1537 1538 static bool cm_req_has_alt_path(struct cm_req_msg *req_msg) 1539 { 1540 return ((req_msg->alt_local_lid) || 1541 (ib_is_opa_gid(&req_msg->alt_local_gid))); 1542 } 1543 1544 static void cm_path_set_rec_type(struct ib_device *ib_device, u8 port_num, 1545 struct sa_path_rec *path, union ib_gid *gid) 1546 { 1547 if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num)) 1548 path->rec_type = SA_PATH_REC_TYPE_OPA; 1549 else 1550 path->rec_type = SA_PATH_REC_TYPE_IB; 1551 } 1552 1553 static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg, 1554 struct sa_path_rec *primary_path, 1555 struct sa_path_rec *alt_path) 1556 { 1557 u32 lid; 1558 1559 if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) { 1560 sa_path_set_dlid(primary_path, 1561 htonl(ntohs(req_msg->primary_local_lid))); 1562 sa_path_set_slid(primary_path, 1563 htonl(ntohs(req_msg->primary_remote_lid))); 1564 } else { 1565 lid = opa_get_lid_from_gid(&req_msg->primary_local_gid); 1566 sa_path_set_dlid(primary_path, cpu_to_be32(lid)); 1567 1568 lid = opa_get_lid_from_gid(&req_msg->primary_remote_gid); 1569 sa_path_set_slid(primary_path, cpu_to_be32(lid)); 1570 } 1571 1572 if (!cm_req_has_alt_path(req_msg)) 1573 return; 1574 1575 if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) { 1576 sa_path_set_dlid(alt_path, 1577 htonl(ntohs(req_msg->alt_local_lid))); 1578 sa_path_set_slid(alt_path, 1579 htonl(ntohs(req_msg->alt_remote_lid))); 1580 } else { 1581 lid = opa_get_lid_from_gid(&req_msg->alt_local_gid); 1582 sa_path_set_dlid(alt_path, cpu_to_be32(lid)); 1583 1584 lid = opa_get_lid_from_gid(&req_msg->alt_remote_gid); 1585 sa_path_set_slid(alt_path, cpu_to_be32(lid)); 1586 } 1587 } 1588 1589 static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1590 struct sa_path_rec *primary_path, 1591 struct sa_path_rec *alt_path) 1592 { 1593 primary_path->dgid = req_msg->primary_local_gid; 1594 primary_path->sgid = req_msg->primary_remote_gid; 1595 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1596 primary_path->hop_limit = req_msg->primary_hop_limit; 1597 primary_path->traffic_class = req_msg->primary_traffic_class; 1598 primary_path->reversible = 1; 1599 primary_path->pkey = req_msg->pkey; 1600 primary_path->sl = cm_req_get_primary_sl(req_msg); 1601 primary_path->mtu_selector = IB_SA_EQ; 1602 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1603 primary_path->rate_selector = IB_SA_EQ; 1604 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1605 primary_path->packet_life_time_selector = IB_SA_EQ; 1606 primary_path->packet_life_time = 1607 cm_req_get_primary_local_ack_timeout(req_msg); 1608 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1609 primary_path->service_id = req_msg->service_id; 1610 if (sa_path_is_roce(primary_path)) 1611 primary_path->roce.route_resolved = false; 1612 1613 if (cm_req_has_alt_path(req_msg)) { 1614 alt_path->dgid = req_msg->alt_local_gid; 1615 alt_path->sgid = req_msg->alt_remote_gid; 1616 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1617 alt_path->hop_limit = req_msg->alt_hop_limit; 1618 alt_path->traffic_class = req_msg->alt_traffic_class; 1619 alt_path->reversible = 1; 1620 alt_path->pkey = req_msg->pkey; 1621 alt_path->sl = cm_req_get_alt_sl(req_msg); 1622 alt_path->mtu_selector = IB_SA_EQ; 1623 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1624 alt_path->rate_selector = IB_SA_EQ; 1625 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1626 alt_path->packet_life_time_selector = IB_SA_EQ; 1627 alt_path->packet_life_time = 1628 cm_req_get_alt_local_ack_timeout(req_msg); 1629 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1630 alt_path->service_id = req_msg->service_id; 1631 1632 if (sa_path_is_roce(alt_path)) 1633 alt_path->roce.route_resolved = false; 1634 } 1635 cm_format_path_lid_from_req(req_msg, primary_path, alt_path); 1636 } 1637 1638 static u16 cm_get_bth_pkey(struct cm_work *work) 1639 { 1640 struct ib_device *ib_dev = work->port->cm_dev->ib_device; 1641 u8 port_num = work->port->port_num; 1642 u16 pkey_index = work->mad_recv_wc->wc->pkey_index; 1643 u16 pkey; 1644 int ret; 1645 1646 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey); 1647 if (ret) { 1648 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n", 1649 port_num, pkey_index, ret); 1650 return 0; 1651 } 1652 1653 return pkey; 1654 } 1655 1656 /** 1657 * Convert OPA SGID to IB SGID 1658 * ULPs (such as IPoIB) do not understand OPA GIDs and will 1659 * reject them as the local_gid will not match the sgid. Therefore, 1660 * change the pathrec's SGID to an IB SGID. 1661 * 1662 * @work: Work completion 1663 * @path: Path record 1664 */ 1665 static void cm_opa_to_ib_sgid(struct cm_work *work, 1666 struct sa_path_rec *path) 1667 { 1668 struct ib_device *dev = work->port->cm_dev->ib_device; 1669 u8 port_num = work->port->port_num; 1670 1671 if (rdma_cap_opa_ah(dev, port_num) && 1672 (ib_is_opa_gid(&path->sgid))) { 1673 union ib_gid sgid; 1674 1675 if (rdma_query_gid(dev, port_num, 0, &sgid)) { 1676 dev_warn(&dev->dev, 1677 "Error updating sgid in CM request\n"); 1678 return; 1679 } 1680 1681 path->sgid = sgid; 1682 } 1683 } 1684 1685 static void cm_format_req_event(struct cm_work *work, 1686 struct cm_id_private *cm_id_priv, 1687 struct ib_cm_id *listen_id) 1688 { 1689 struct cm_req_msg *req_msg; 1690 struct ib_cm_req_event_param *param; 1691 1692 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1693 param = &work->cm_event.param.req_rcvd; 1694 param->listen_id = listen_id; 1695 param->bth_pkey = cm_get_bth_pkey(work); 1696 param->port = cm_id_priv->av.port->port_num; 1697 param->primary_path = &work->path[0]; 1698 cm_opa_to_ib_sgid(work, param->primary_path); 1699 if (cm_req_has_alt_path(req_msg)) { 1700 param->alternate_path = &work->path[1]; 1701 cm_opa_to_ib_sgid(work, param->alternate_path); 1702 } else { 1703 param->alternate_path = NULL; 1704 } 1705 param->remote_ca_guid = req_msg->local_ca_guid; 1706 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1707 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1708 param->qp_type = cm_req_get_qp_type(req_msg); 1709 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1710 param->responder_resources = cm_req_get_init_depth(req_msg); 1711 param->initiator_depth = cm_req_get_resp_res(req_msg); 1712 param->local_cm_response_timeout = 1713 cm_req_get_remote_resp_timeout(req_msg); 1714 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1715 param->remote_cm_response_timeout = 1716 cm_req_get_local_resp_timeout(req_msg); 1717 param->retry_count = cm_req_get_retry_count(req_msg); 1718 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1719 param->srq = cm_req_get_srq(req_msg); 1720 param->ppath_sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr; 1721 work->cm_event.private_data = &req_msg->private_data; 1722 } 1723 1724 static void cm_process_work(struct cm_id_private *cm_id_priv, 1725 struct cm_work *work) 1726 { 1727 int ret; 1728 1729 /* We will typically only have the current event to report. */ 1730 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1731 cm_free_work(work); 1732 1733 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1734 spin_lock_irq(&cm_id_priv->lock); 1735 work = cm_dequeue_work(cm_id_priv); 1736 spin_unlock_irq(&cm_id_priv->lock); 1737 BUG_ON(!work); 1738 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1739 &work->cm_event); 1740 cm_free_work(work); 1741 } 1742 cm_deref_id(cm_id_priv); 1743 if (ret) 1744 cm_destroy_id(&cm_id_priv->id, ret); 1745 } 1746 1747 static void cm_format_mra(struct cm_mra_msg *mra_msg, 1748 struct cm_id_private *cm_id_priv, 1749 enum cm_msg_response msg_mraed, u8 service_timeout, 1750 const void *private_data, u8 private_data_len) 1751 { 1752 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1753 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1754 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1755 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1756 cm_mra_set_service_timeout(mra_msg, service_timeout); 1757 1758 if (private_data && private_data_len) 1759 memcpy(mra_msg->private_data, private_data, private_data_len); 1760 } 1761 1762 static void cm_format_rej(struct cm_rej_msg *rej_msg, 1763 struct cm_id_private *cm_id_priv, 1764 enum ib_cm_rej_reason reason, 1765 void *ari, 1766 u8 ari_length, 1767 const void *private_data, 1768 u8 private_data_len) 1769 { 1770 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1771 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1772 1773 switch(cm_id_priv->id.state) { 1774 case IB_CM_REQ_RCVD: 1775 rej_msg->local_comm_id = 0; 1776 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1777 break; 1778 case IB_CM_MRA_REQ_SENT: 1779 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1780 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1781 break; 1782 case IB_CM_REP_RCVD: 1783 case IB_CM_MRA_REP_SENT: 1784 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1785 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1786 break; 1787 default: 1788 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1789 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1790 break; 1791 } 1792 1793 rej_msg->reason = cpu_to_be16(reason); 1794 if (ari && ari_length) { 1795 cm_rej_set_reject_info_len(rej_msg, ari_length); 1796 memcpy(rej_msg->ari, ari, ari_length); 1797 } 1798 1799 if (private_data && private_data_len) 1800 memcpy(rej_msg->private_data, private_data, private_data_len); 1801 } 1802 1803 static void cm_dup_req_handler(struct cm_work *work, 1804 struct cm_id_private *cm_id_priv) 1805 { 1806 struct ib_mad_send_buf *msg = NULL; 1807 int ret; 1808 1809 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1810 counter[CM_REQ_COUNTER]); 1811 1812 /* Quick state check to discard duplicate REQs. */ 1813 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1814 return; 1815 1816 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1817 if (ret) 1818 return; 1819 1820 spin_lock_irq(&cm_id_priv->lock); 1821 switch (cm_id_priv->id.state) { 1822 case IB_CM_MRA_REQ_SENT: 1823 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1824 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1825 cm_id_priv->private_data, 1826 cm_id_priv->private_data_len); 1827 break; 1828 case IB_CM_TIMEWAIT: 1829 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1830 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1831 break; 1832 default: 1833 goto unlock; 1834 } 1835 spin_unlock_irq(&cm_id_priv->lock); 1836 1837 ret = ib_post_send_mad(msg, NULL); 1838 if (ret) 1839 goto free; 1840 return; 1841 1842 unlock: spin_unlock_irq(&cm_id_priv->lock); 1843 free: cm_free_msg(msg); 1844 } 1845 1846 static struct cm_id_private * cm_match_req(struct cm_work *work, 1847 struct cm_id_private *cm_id_priv) 1848 { 1849 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1850 struct cm_timewait_info *timewait_info; 1851 struct cm_req_msg *req_msg; 1852 struct ib_cm_id *cm_id; 1853 1854 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1855 1856 /* Check for possible duplicate REQ. */ 1857 spin_lock_irq(&cm.lock); 1858 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1859 if (timewait_info) { 1860 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1861 timewait_info->work.remote_id); 1862 spin_unlock_irq(&cm.lock); 1863 if (cur_cm_id_priv) { 1864 cm_dup_req_handler(work, cur_cm_id_priv); 1865 cm_deref_id(cur_cm_id_priv); 1866 } 1867 return NULL; 1868 } 1869 1870 /* Check for stale connections. */ 1871 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1872 if (timewait_info) { 1873 cm_cleanup_timewait(cm_id_priv->timewait_info); 1874 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1875 timewait_info->work.remote_id); 1876 1877 spin_unlock_irq(&cm.lock); 1878 cm_issue_rej(work->port, work->mad_recv_wc, 1879 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1880 NULL, 0); 1881 if (cur_cm_id_priv) { 1882 cm_id = &cur_cm_id_priv->id; 1883 ib_send_cm_dreq(cm_id, NULL, 0); 1884 cm_deref_id(cur_cm_id_priv); 1885 } 1886 return NULL; 1887 } 1888 1889 /* Find matching listen request. */ 1890 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1891 req_msg->service_id); 1892 if (!listen_cm_id_priv) { 1893 cm_cleanup_timewait(cm_id_priv->timewait_info); 1894 spin_unlock_irq(&cm.lock); 1895 cm_issue_rej(work->port, work->mad_recv_wc, 1896 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1897 NULL, 0); 1898 goto out; 1899 } 1900 atomic_inc(&listen_cm_id_priv->refcount); 1901 atomic_inc(&cm_id_priv->refcount); 1902 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1903 atomic_inc(&cm_id_priv->work_count); 1904 spin_unlock_irq(&cm.lock); 1905 out: 1906 return listen_cm_id_priv; 1907 } 1908 1909 /* 1910 * Work-around for inter-subnet connections. If the LIDs are permissive, 1911 * we need to override the LID/SL data in the REQ with the LID information 1912 * in the work completion. 1913 */ 1914 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 1915 { 1916 if (!cm_req_get_primary_subnet_local(req_msg)) { 1917 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) { 1918 req_msg->primary_local_lid = ib_lid_be16(wc->slid); 1919 cm_req_set_primary_sl(req_msg, wc->sl); 1920 } 1921 1922 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE) 1923 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1924 } 1925 1926 if (!cm_req_get_alt_subnet_local(req_msg)) { 1927 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) { 1928 req_msg->alt_local_lid = ib_lid_be16(wc->slid); 1929 cm_req_set_alt_sl(req_msg, wc->sl); 1930 } 1931 1932 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE) 1933 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1934 } 1935 } 1936 1937 static int cm_req_handler(struct cm_work *work) 1938 { 1939 struct ib_cm_id *cm_id; 1940 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1941 struct cm_req_msg *req_msg; 1942 const struct ib_global_route *grh; 1943 const struct ib_gid_attr *gid_attr; 1944 int ret; 1945 1946 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1947 1948 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 1949 if (IS_ERR(cm_id)) 1950 return PTR_ERR(cm_id); 1951 1952 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1953 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1954 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1955 work->mad_recv_wc->recv_buf.grh, 1956 &cm_id_priv->av); 1957 if (ret) 1958 goto destroy; 1959 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1960 id.local_id); 1961 if (IS_ERR(cm_id_priv->timewait_info)) { 1962 ret = PTR_ERR(cm_id_priv->timewait_info); 1963 goto destroy; 1964 } 1965 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1966 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1967 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1968 1969 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1970 if (!listen_cm_id_priv) { 1971 ret = -EINVAL; 1972 goto free_timeinfo; 1973 } 1974 1975 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1976 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1977 cm_id_priv->id.service_id = req_msg->service_id; 1978 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 1979 1980 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 1981 1982 memset(&work->path[0], 0, sizeof(work->path[0])); 1983 if (cm_req_has_alt_path(req_msg)) 1984 memset(&work->path[1], 0, sizeof(work->path[1])); 1985 grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr); 1986 gid_attr = grh->sgid_attr; 1987 1988 if (gid_attr && 1989 rdma_protocol_roce(work->port->cm_dev->ib_device, 1990 work->port->port_num)) { 1991 work->path[0].rec_type = 1992 sa_conv_gid_to_pathrec_type(gid_attr->gid_type); 1993 } else { 1994 cm_path_set_rec_type(work->port->cm_dev->ib_device, 1995 work->port->port_num, 1996 &work->path[0], 1997 &req_msg->primary_local_gid); 1998 } 1999 if (cm_req_has_alt_path(req_msg)) 2000 work->path[1].rec_type = work->path[0].rec_type; 2001 cm_format_paths_from_req(req_msg, &work->path[0], 2002 &work->path[1]); 2003 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE) 2004 sa_path_set_dmac(&work->path[0], 2005 cm_id_priv->av.ah_attr.roce.dmac); 2006 work->path[0].hop_limit = grh->hop_limit; 2007 ret = cm_init_av_by_path(&work->path[0], gid_attr, &cm_id_priv->av, 2008 cm_id_priv); 2009 if (ret) { 2010 int err; 2011 2012 err = rdma_query_gid(work->port->cm_dev->ib_device, 2013 work->port->port_num, 0, 2014 &work->path[0].sgid); 2015 if (err) 2016 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 2017 NULL, 0, NULL, 0); 2018 else 2019 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 2020 &work->path[0].sgid, 2021 sizeof(work->path[0].sgid), 2022 NULL, 0); 2023 goto rejected; 2024 } 2025 if (cm_req_has_alt_path(req_msg)) { 2026 ret = cm_init_av_by_path(&work->path[1], NULL, 2027 &cm_id_priv->alt_av, cm_id_priv); 2028 if (ret) { 2029 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID, 2030 &work->path[0].sgid, 2031 sizeof(work->path[0].sgid), NULL, 0); 2032 goto rejected; 2033 } 2034 } 2035 cm_id_priv->tid = req_msg->hdr.tid; 2036 cm_id_priv->timeout_ms = cm_convert_to_ms( 2037 cm_req_get_local_resp_timeout(req_msg)); 2038 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 2039 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 2040 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 2041 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 2042 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 2043 cm_id_priv->pkey = req_msg->pkey; 2044 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 2045 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 2046 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 2047 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 2048 2049 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 2050 cm_process_work(cm_id_priv, work); 2051 cm_deref_id(listen_cm_id_priv); 2052 return 0; 2053 2054 rejected: 2055 atomic_dec(&cm_id_priv->refcount); 2056 cm_deref_id(listen_cm_id_priv); 2057 free_timeinfo: 2058 kfree(cm_id_priv->timewait_info); 2059 destroy: 2060 ib_destroy_cm_id(cm_id); 2061 return ret; 2062 } 2063 2064 static void cm_format_rep(struct cm_rep_msg *rep_msg, 2065 struct cm_id_private *cm_id_priv, 2066 struct ib_cm_rep_param *param) 2067 { 2068 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 2069 rep_msg->local_comm_id = cm_id_priv->id.local_id; 2070 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 2071 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 2072 rep_msg->resp_resources = param->responder_resources; 2073 cm_rep_set_target_ack_delay(rep_msg, 2074 cm_id_priv->av.port->cm_dev->ack_delay); 2075 cm_rep_set_failover(rep_msg, param->failover_accepted); 2076 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 2077 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 2078 2079 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) { 2080 rep_msg->initiator_depth = param->initiator_depth; 2081 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 2082 cm_rep_set_srq(rep_msg, param->srq); 2083 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 2084 } else { 2085 cm_rep_set_srq(rep_msg, 1); 2086 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num)); 2087 } 2088 2089 if (param->private_data && param->private_data_len) 2090 memcpy(rep_msg->private_data, param->private_data, 2091 param->private_data_len); 2092 } 2093 2094 int ib_send_cm_rep(struct ib_cm_id *cm_id, 2095 struct ib_cm_rep_param *param) 2096 { 2097 struct cm_id_private *cm_id_priv; 2098 struct ib_mad_send_buf *msg; 2099 struct cm_rep_msg *rep_msg; 2100 unsigned long flags; 2101 int ret; 2102 2103 if (param->private_data && 2104 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 2105 return -EINVAL; 2106 2107 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2108 spin_lock_irqsave(&cm_id_priv->lock, flags); 2109 if (cm_id->state != IB_CM_REQ_RCVD && 2110 cm_id->state != IB_CM_MRA_REQ_SENT) { 2111 ret = -EINVAL; 2112 goto out; 2113 } 2114 2115 ret = cm_alloc_msg(cm_id_priv, &msg); 2116 if (ret) 2117 goto out; 2118 2119 rep_msg = (struct cm_rep_msg *) msg->mad; 2120 cm_format_rep(rep_msg, cm_id_priv, param); 2121 msg->timeout_ms = cm_id_priv->timeout_ms; 2122 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 2123 2124 ret = ib_post_send_mad(msg, NULL); 2125 if (ret) { 2126 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2127 cm_free_msg(msg); 2128 return ret; 2129 } 2130 2131 cm_id->state = IB_CM_REP_SENT; 2132 cm_id_priv->msg = msg; 2133 cm_id_priv->initiator_depth = param->initiator_depth; 2134 cm_id_priv->responder_resources = param->responder_resources; 2135 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 2136 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF); 2137 2138 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2139 return ret; 2140 } 2141 EXPORT_SYMBOL(ib_send_cm_rep); 2142 2143 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 2144 struct cm_id_private *cm_id_priv, 2145 const void *private_data, 2146 u8 private_data_len) 2147 { 2148 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 2149 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 2150 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 2151 2152 if (private_data && private_data_len) 2153 memcpy(rtu_msg->private_data, private_data, private_data_len); 2154 } 2155 2156 int ib_send_cm_rtu(struct ib_cm_id *cm_id, 2157 const void *private_data, 2158 u8 private_data_len) 2159 { 2160 struct cm_id_private *cm_id_priv; 2161 struct ib_mad_send_buf *msg; 2162 unsigned long flags; 2163 void *data; 2164 int ret; 2165 2166 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 2167 return -EINVAL; 2168 2169 data = cm_copy_private_data(private_data, private_data_len); 2170 if (IS_ERR(data)) 2171 return PTR_ERR(data); 2172 2173 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2174 spin_lock_irqsave(&cm_id_priv->lock, flags); 2175 if (cm_id->state != IB_CM_REP_RCVD && 2176 cm_id->state != IB_CM_MRA_REP_SENT) { 2177 ret = -EINVAL; 2178 goto error; 2179 } 2180 2181 ret = cm_alloc_msg(cm_id_priv, &msg); 2182 if (ret) 2183 goto error; 2184 2185 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 2186 private_data, private_data_len); 2187 2188 ret = ib_post_send_mad(msg, NULL); 2189 if (ret) { 2190 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2191 cm_free_msg(msg); 2192 kfree(data); 2193 return ret; 2194 } 2195 2196 cm_id->state = IB_CM_ESTABLISHED; 2197 cm_set_private_data(cm_id_priv, data, private_data_len); 2198 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2199 return 0; 2200 2201 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2202 kfree(data); 2203 return ret; 2204 } 2205 EXPORT_SYMBOL(ib_send_cm_rtu); 2206 2207 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type) 2208 { 2209 struct cm_rep_msg *rep_msg; 2210 struct ib_cm_rep_event_param *param; 2211 2212 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 2213 param = &work->cm_event.param.rep_rcvd; 2214 param->remote_ca_guid = rep_msg->local_ca_guid; 2215 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 2216 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type)); 2217 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 2218 param->responder_resources = rep_msg->initiator_depth; 2219 param->initiator_depth = rep_msg->resp_resources; 2220 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 2221 param->failover_accepted = cm_rep_get_failover(rep_msg); 2222 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 2223 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 2224 param->srq = cm_rep_get_srq(rep_msg); 2225 work->cm_event.private_data = &rep_msg->private_data; 2226 } 2227 2228 static void cm_dup_rep_handler(struct cm_work *work) 2229 { 2230 struct cm_id_private *cm_id_priv; 2231 struct cm_rep_msg *rep_msg; 2232 struct ib_mad_send_buf *msg = NULL; 2233 int ret; 2234 2235 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 2236 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 2237 rep_msg->local_comm_id); 2238 if (!cm_id_priv) 2239 return; 2240 2241 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2242 counter[CM_REP_COUNTER]); 2243 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 2244 if (ret) 2245 goto deref; 2246 2247 spin_lock_irq(&cm_id_priv->lock); 2248 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 2249 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 2250 cm_id_priv->private_data, 2251 cm_id_priv->private_data_len); 2252 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 2253 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2254 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 2255 cm_id_priv->private_data, 2256 cm_id_priv->private_data_len); 2257 else 2258 goto unlock; 2259 spin_unlock_irq(&cm_id_priv->lock); 2260 2261 ret = ib_post_send_mad(msg, NULL); 2262 if (ret) 2263 goto free; 2264 goto deref; 2265 2266 unlock: spin_unlock_irq(&cm_id_priv->lock); 2267 free: cm_free_msg(msg); 2268 deref: cm_deref_id(cm_id_priv); 2269 } 2270 2271 static int cm_rep_handler(struct cm_work *work) 2272 { 2273 struct cm_id_private *cm_id_priv; 2274 struct cm_rep_msg *rep_msg; 2275 int ret; 2276 struct cm_id_private *cur_cm_id_priv; 2277 struct ib_cm_id *cm_id; 2278 struct cm_timewait_info *timewait_info; 2279 2280 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 2281 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 2282 if (!cm_id_priv) { 2283 cm_dup_rep_handler(work); 2284 return -EINVAL; 2285 } 2286 2287 cm_format_rep_event(work, cm_id_priv->qp_type); 2288 2289 spin_lock_irq(&cm_id_priv->lock); 2290 switch (cm_id_priv->id.state) { 2291 case IB_CM_REQ_SENT: 2292 case IB_CM_MRA_REQ_RCVD: 2293 break; 2294 default: 2295 spin_unlock_irq(&cm_id_priv->lock); 2296 ret = -EINVAL; 2297 goto error; 2298 } 2299 2300 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 2301 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 2302 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2303 2304 spin_lock(&cm.lock); 2305 /* Check for duplicate REP. */ 2306 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 2307 spin_unlock(&cm.lock); 2308 spin_unlock_irq(&cm_id_priv->lock); 2309 ret = -EINVAL; 2310 goto error; 2311 } 2312 /* Check for a stale connection. */ 2313 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 2314 if (timewait_info) { 2315 rb_erase(&cm_id_priv->timewait_info->remote_id_node, 2316 &cm.remote_id_table); 2317 cm_id_priv->timewait_info->inserted_remote_id = 0; 2318 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 2319 timewait_info->work.remote_id); 2320 2321 spin_unlock(&cm.lock); 2322 spin_unlock_irq(&cm_id_priv->lock); 2323 cm_issue_rej(work->port, work->mad_recv_wc, 2324 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 2325 NULL, 0); 2326 ret = -EINVAL; 2327 if (cur_cm_id_priv) { 2328 cm_id = &cur_cm_id_priv->id; 2329 ib_send_cm_dreq(cm_id, NULL, 0); 2330 cm_deref_id(cur_cm_id_priv); 2331 } 2332 2333 goto error; 2334 } 2335 spin_unlock(&cm.lock); 2336 2337 cm_id_priv->id.state = IB_CM_REP_RCVD; 2338 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 2339 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2340 cm_id_priv->initiator_depth = rep_msg->resp_resources; 2341 cm_id_priv->responder_resources = rep_msg->initiator_depth; 2342 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 2343 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 2344 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 2345 cm_id_priv->av.timeout = 2346 cm_ack_timeout(cm_id_priv->target_ack_delay, 2347 cm_id_priv->av.timeout - 1); 2348 cm_id_priv->alt_av.timeout = 2349 cm_ack_timeout(cm_id_priv->target_ack_delay, 2350 cm_id_priv->alt_av.timeout - 1); 2351 2352 /* todo: handle peer_to_peer */ 2353 2354 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2355 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2356 if (!ret) 2357 list_add_tail(&work->list, &cm_id_priv->work_list); 2358 spin_unlock_irq(&cm_id_priv->lock); 2359 2360 if (ret) 2361 cm_process_work(cm_id_priv, work); 2362 else 2363 cm_deref_id(cm_id_priv); 2364 return 0; 2365 2366 error: 2367 cm_deref_id(cm_id_priv); 2368 return ret; 2369 } 2370 2371 static int cm_establish_handler(struct cm_work *work) 2372 { 2373 struct cm_id_private *cm_id_priv; 2374 int ret; 2375 2376 /* See comment in cm_establish about lookup. */ 2377 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 2378 if (!cm_id_priv) 2379 return -EINVAL; 2380 2381 spin_lock_irq(&cm_id_priv->lock); 2382 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 2383 spin_unlock_irq(&cm_id_priv->lock); 2384 goto out; 2385 } 2386 2387 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2388 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2389 if (!ret) 2390 list_add_tail(&work->list, &cm_id_priv->work_list); 2391 spin_unlock_irq(&cm_id_priv->lock); 2392 2393 if (ret) 2394 cm_process_work(cm_id_priv, work); 2395 else 2396 cm_deref_id(cm_id_priv); 2397 return 0; 2398 out: 2399 cm_deref_id(cm_id_priv); 2400 return -EINVAL; 2401 } 2402 2403 static int cm_rtu_handler(struct cm_work *work) 2404 { 2405 struct cm_id_private *cm_id_priv; 2406 struct cm_rtu_msg *rtu_msg; 2407 int ret; 2408 2409 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 2410 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 2411 rtu_msg->local_comm_id); 2412 if (!cm_id_priv) 2413 return -EINVAL; 2414 2415 work->cm_event.private_data = &rtu_msg->private_data; 2416 2417 spin_lock_irq(&cm_id_priv->lock); 2418 if (cm_id_priv->id.state != IB_CM_REP_SENT && 2419 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 2420 spin_unlock_irq(&cm_id_priv->lock); 2421 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2422 counter[CM_RTU_COUNTER]); 2423 goto out; 2424 } 2425 cm_id_priv->id.state = IB_CM_ESTABLISHED; 2426 2427 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2428 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2429 if (!ret) 2430 list_add_tail(&work->list, &cm_id_priv->work_list); 2431 spin_unlock_irq(&cm_id_priv->lock); 2432 2433 if (ret) 2434 cm_process_work(cm_id_priv, work); 2435 else 2436 cm_deref_id(cm_id_priv); 2437 return 0; 2438 out: 2439 cm_deref_id(cm_id_priv); 2440 return -EINVAL; 2441 } 2442 2443 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 2444 struct cm_id_private *cm_id_priv, 2445 const void *private_data, 2446 u8 private_data_len) 2447 { 2448 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 2449 cm_form_tid(cm_id_priv)); 2450 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 2451 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 2452 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 2453 2454 if (private_data && private_data_len) 2455 memcpy(dreq_msg->private_data, private_data, private_data_len); 2456 } 2457 2458 int ib_send_cm_dreq(struct ib_cm_id *cm_id, 2459 const void *private_data, 2460 u8 private_data_len) 2461 { 2462 struct cm_id_private *cm_id_priv; 2463 struct ib_mad_send_buf *msg; 2464 unsigned long flags; 2465 int ret; 2466 2467 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 2468 return -EINVAL; 2469 2470 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2471 spin_lock_irqsave(&cm_id_priv->lock, flags); 2472 if (cm_id->state != IB_CM_ESTABLISHED) { 2473 ret = -EINVAL; 2474 goto out; 2475 } 2476 2477 if (cm_id->lap_state == IB_CM_LAP_SENT || 2478 cm_id->lap_state == IB_CM_MRA_LAP_RCVD) 2479 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2480 2481 ret = cm_alloc_msg(cm_id_priv, &msg); 2482 if (ret) { 2483 cm_enter_timewait(cm_id_priv); 2484 goto out; 2485 } 2486 2487 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 2488 private_data, private_data_len); 2489 msg->timeout_ms = cm_id_priv->timeout_ms; 2490 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2491 2492 ret = ib_post_send_mad(msg, NULL); 2493 if (ret) { 2494 cm_enter_timewait(cm_id_priv); 2495 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2496 cm_free_msg(msg); 2497 return ret; 2498 } 2499 2500 cm_id->state = IB_CM_DREQ_SENT; 2501 cm_id_priv->msg = msg; 2502 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2503 return ret; 2504 } 2505 EXPORT_SYMBOL(ib_send_cm_dreq); 2506 2507 static void cm_format_drep(struct cm_drep_msg *drep_msg, 2508 struct cm_id_private *cm_id_priv, 2509 const void *private_data, 2510 u8 private_data_len) 2511 { 2512 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2513 drep_msg->local_comm_id = cm_id_priv->id.local_id; 2514 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 2515 2516 if (private_data && private_data_len) 2517 memcpy(drep_msg->private_data, private_data, private_data_len); 2518 } 2519 2520 int ib_send_cm_drep(struct ib_cm_id *cm_id, 2521 const void *private_data, 2522 u8 private_data_len) 2523 { 2524 struct cm_id_private *cm_id_priv; 2525 struct ib_mad_send_buf *msg; 2526 unsigned long flags; 2527 void *data; 2528 int ret; 2529 2530 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2531 return -EINVAL; 2532 2533 data = cm_copy_private_data(private_data, private_data_len); 2534 if (IS_ERR(data)) 2535 return PTR_ERR(data); 2536 2537 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2538 spin_lock_irqsave(&cm_id_priv->lock, flags); 2539 if (cm_id->state != IB_CM_DREQ_RCVD) { 2540 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2541 kfree(data); 2542 return -EINVAL; 2543 } 2544 2545 cm_set_private_data(cm_id_priv, data, private_data_len); 2546 cm_enter_timewait(cm_id_priv); 2547 2548 ret = cm_alloc_msg(cm_id_priv, &msg); 2549 if (ret) 2550 goto out; 2551 2552 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2553 private_data, private_data_len); 2554 2555 ret = ib_post_send_mad(msg, NULL); 2556 if (ret) { 2557 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2558 cm_free_msg(msg); 2559 return ret; 2560 } 2561 2562 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2563 return ret; 2564 } 2565 EXPORT_SYMBOL(ib_send_cm_drep); 2566 2567 static int cm_issue_drep(struct cm_port *port, 2568 struct ib_mad_recv_wc *mad_recv_wc) 2569 { 2570 struct ib_mad_send_buf *msg = NULL; 2571 struct cm_dreq_msg *dreq_msg; 2572 struct cm_drep_msg *drep_msg; 2573 int ret; 2574 2575 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2576 if (ret) 2577 return ret; 2578 2579 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2580 drep_msg = (struct cm_drep_msg *) msg->mad; 2581 2582 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2583 drep_msg->remote_comm_id = dreq_msg->local_comm_id; 2584 drep_msg->local_comm_id = dreq_msg->remote_comm_id; 2585 2586 ret = ib_post_send_mad(msg, NULL); 2587 if (ret) 2588 cm_free_msg(msg); 2589 2590 return ret; 2591 } 2592 2593 static int cm_dreq_handler(struct cm_work *work) 2594 { 2595 struct cm_id_private *cm_id_priv; 2596 struct cm_dreq_msg *dreq_msg; 2597 struct ib_mad_send_buf *msg = NULL; 2598 int ret; 2599 2600 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2601 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 2602 dreq_msg->local_comm_id); 2603 if (!cm_id_priv) { 2604 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2605 counter[CM_DREQ_COUNTER]); 2606 cm_issue_drep(work->port, work->mad_recv_wc); 2607 return -EINVAL; 2608 } 2609 2610 work->cm_event.private_data = &dreq_msg->private_data; 2611 2612 spin_lock_irq(&cm_id_priv->lock); 2613 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 2614 goto unlock; 2615 2616 switch (cm_id_priv->id.state) { 2617 case IB_CM_REP_SENT: 2618 case IB_CM_DREQ_SENT: 2619 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2620 break; 2621 case IB_CM_ESTABLISHED: 2622 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2623 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2624 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2625 break; 2626 case IB_CM_MRA_REP_RCVD: 2627 break; 2628 case IB_CM_TIMEWAIT: 2629 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2630 counter[CM_DREQ_COUNTER]); 2631 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc); 2632 if (IS_ERR(msg)) 2633 goto unlock; 2634 2635 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2636 cm_id_priv->private_data, 2637 cm_id_priv->private_data_len); 2638 spin_unlock_irq(&cm_id_priv->lock); 2639 2640 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || 2641 ib_post_send_mad(msg, NULL)) 2642 cm_free_msg(msg); 2643 goto deref; 2644 case IB_CM_DREQ_RCVD: 2645 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2646 counter[CM_DREQ_COUNTER]); 2647 goto unlock; 2648 default: 2649 goto unlock; 2650 } 2651 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2652 cm_id_priv->tid = dreq_msg->hdr.tid; 2653 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2654 if (!ret) 2655 list_add_tail(&work->list, &cm_id_priv->work_list); 2656 spin_unlock_irq(&cm_id_priv->lock); 2657 2658 if (ret) 2659 cm_process_work(cm_id_priv, work); 2660 else 2661 cm_deref_id(cm_id_priv); 2662 return 0; 2663 2664 unlock: spin_unlock_irq(&cm_id_priv->lock); 2665 deref: cm_deref_id(cm_id_priv); 2666 return -EINVAL; 2667 } 2668 2669 static int cm_drep_handler(struct cm_work *work) 2670 { 2671 struct cm_id_private *cm_id_priv; 2672 struct cm_drep_msg *drep_msg; 2673 int ret; 2674 2675 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2676 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 2677 drep_msg->local_comm_id); 2678 if (!cm_id_priv) 2679 return -EINVAL; 2680 2681 work->cm_event.private_data = &drep_msg->private_data; 2682 2683 spin_lock_irq(&cm_id_priv->lock); 2684 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2685 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2686 spin_unlock_irq(&cm_id_priv->lock); 2687 goto out; 2688 } 2689 cm_enter_timewait(cm_id_priv); 2690 2691 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2692 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2693 if (!ret) 2694 list_add_tail(&work->list, &cm_id_priv->work_list); 2695 spin_unlock_irq(&cm_id_priv->lock); 2696 2697 if (ret) 2698 cm_process_work(cm_id_priv, work); 2699 else 2700 cm_deref_id(cm_id_priv); 2701 return 0; 2702 out: 2703 cm_deref_id(cm_id_priv); 2704 return -EINVAL; 2705 } 2706 2707 int ib_send_cm_rej(struct ib_cm_id *cm_id, 2708 enum ib_cm_rej_reason reason, 2709 void *ari, 2710 u8 ari_length, 2711 const void *private_data, 2712 u8 private_data_len) 2713 { 2714 struct cm_id_private *cm_id_priv; 2715 struct ib_mad_send_buf *msg; 2716 unsigned long flags; 2717 int ret; 2718 2719 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2720 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2721 return -EINVAL; 2722 2723 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2724 2725 spin_lock_irqsave(&cm_id_priv->lock, flags); 2726 switch (cm_id->state) { 2727 case IB_CM_REQ_SENT: 2728 case IB_CM_MRA_REQ_RCVD: 2729 case IB_CM_REQ_RCVD: 2730 case IB_CM_MRA_REQ_SENT: 2731 case IB_CM_REP_RCVD: 2732 case IB_CM_MRA_REP_SENT: 2733 ret = cm_alloc_msg(cm_id_priv, &msg); 2734 if (!ret) 2735 cm_format_rej((struct cm_rej_msg *) msg->mad, 2736 cm_id_priv, reason, ari, ari_length, 2737 private_data, private_data_len); 2738 2739 cm_reset_to_idle(cm_id_priv); 2740 break; 2741 case IB_CM_REP_SENT: 2742 case IB_CM_MRA_REP_RCVD: 2743 ret = cm_alloc_msg(cm_id_priv, &msg); 2744 if (!ret) 2745 cm_format_rej((struct cm_rej_msg *) msg->mad, 2746 cm_id_priv, reason, ari, ari_length, 2747 private_data, private_data_len); 2748 2749 cm_enter_timewait(cm_id_priv); 2750 break; 2751 default: 2752 ret = -EINVAL; 2753 goto out; 2754 } 2755 2756 if (ret) 2757 goto out; 2758 2759 ret = ib_post_send_mad(msg, NULL); 2760 if (ret) 2761 cm_free_msg(msg); 2762 2763 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2764 return ret; 2765 } 2766 EXPORT_SYMBOL(ib_send_cm_rej); 2767 2768 static void cm_format_rej_event(struct cm_work *work) 2769 { 2770 struct cm_rej_msg *rej_msg; 2771 struct ib_cm_rej_event_param *param; 2772 2773 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2774 param = &work->cm_event.param.rej_rcvd; 2775 param->ari = rej_msg->ari; 2776 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2777 param->reason = __be16_to_cpu(rej_msg->reason); 2778 work->cm_event.private_data = &rej_msg->private_data; 2779 } 2780 2781 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2782 { 2783 struct cm_timewait_info *timewait_info; 2784 struct cm_id_private *cm_id_priv; 2785 __be32 remote_id; 2786 2787 remote_id = rej_msg->local_comm_id; 2788 2789 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2790 spin_lock_irq(&cm.lock); 2791 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2792 remote_id); 2793 if (!timewait_info) { 2794 spin_unlock_irq(&cm.lock); 2795 return NULL; 2796 } 2797 cm_id_priv = idr_find(&cm.local_id_table, (__force int) 2798 (timewait_info->work.local_id ^ 2799 cm.random_id_operand)); 2800 if (cm_id_priv) { 2801 if (cm_id_priv->id.remote_id == remote_id) 2802 atomic_inc(&cm_id_priv->refcount); 2803 else 2804 cm_id_priv = NULL; 2805 } 2806 spin_unlock_irq(&cm.lock); 2807 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2808 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2809 else 2810 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2811 2812 return cm_id_priv; 2813 } 2814 2815 static int cm_rej_handler(struct cm_work *work) 2816 { 2817 struct cm_id_private *cm_id_priv; 2818 struct cm_rej_msg *rej_msg; 2819 int ret; 2820 2821 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2822 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2823 if (!cm_id_priv) 2824 return -EINVAL; 2825 2826 cm_format_rej_event(work); 2827 2828 spin_lock_irq(&cm_id_priv->lock); 2829 switch (cm_id_priv->id.state) { 2830 case IB_CM_REQ_SENT: 2831 case IB_CM_MRA_REQ_RCVD: 2832 case IB_CM_REP_SENT: 2833 case IB_CM_MRA_REP_RCVD: 2834 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2835 /* fall through */ 2836 case IB_CM_REQ_RCVD: 2837 case IB_CM_MRA_REQ_SENT: 2838 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2839 cm_enter_timewait(cm_id_priv); 2840 else 2841 cm_reset_to_idle(cm_id_priv); 2842 break; 2843 case IB_CM_DREQ_SENT: 2844 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2845 /* fall through */ 2846 case IB_CM_REP_RCVD: 2847 case IB_CM_MRA_REP_SENT: 2848 cm_enter_timewait(cm_id_priv); 2849 break; 2850 case IB_CM_ESTABLISHED: 2851 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT || 2852 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) { 2853 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT) 2854 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 2855 cm_id_priv->msg); 2856 cm_enter_timewait(cm_id_priv); 2857 break; 2858 } 2859 /* fall through */ 2860 default: 2861 spin_unlock_irq(&cm_id_priv->lock); 2862 ret = -EINVAL; 2863 goto out; 2864 } 2865 2866 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2867 if (!ret) 2868 list_add_tail(&work->list, &cm_id_priv->work_list); 2869 spin_unlock_irq(&cm_id_priv->lock); 2870 2871 if (ret) 2872 cm_process_work(cm_id_priv, work); 2873 else 2874 cm_deref_id(cm_id_priv); 2875 return 0; 2876 out: 2877 cm_deref_id(cm_id_priv); 2878 return -EINVAL; 2879 } 2880 2881 int ib_send_cm_mra(struct ib_cm_id *cm_id, 2882 u8 service_timeout, 2883 const void *private_data, 2884 u8 private_data_len) 2885 { 2886 struct cm_id_private *cm_id_priv; 2887 struct ib_mad_send_buf *msg; 2888 enum ib_cm_state cm_state; 2889 enum ib_cm_lap_state lap_state; 2890 enum cm_msg_response msg_response; 2891 void *data; 2892 unsigned long flags; 2893 int ret; 2894 2895 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2896 return -EINVAL; 2897 2898 data = cm_copy_private_data(private_data, private_data_len); 2899 if (IS_ERR(data)) 2900 return PTR_ERR(data); 2901 2902 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2903 2904 spin_lock_irqsave(&cm_id_priv->lock, flags); 2905 switch(cm_id_priv->id.state) { 2906 case IB_CM_REQ_RCVD: 2907 cm_state = IB_CM_MRA_REQ_SENT; 2908 lap_state = cm_id->lap_state; 2909 msg_response = CM_MSG_RESPONSE_REQ; 2910 break; 2911 case IB_CM_REP_RCVD: 2912 cm_state = IB_CM_MRA_REP_SENT; 2913 lap_state = cm_id->lap_state; 2914 msg_response = CM_MSG_RESPONSE_REP; 2915 break; 2916 case IB_CM_ESTABLISHED: 2917 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 2918 cm_state = cm_id->state; 2919 lap_state = IB_CM_MRA_LAP_SENT; 2920 msg_response = CM_MSG_RESPONSE_OTHER; 2921 break; 2922 } 2923 default: 2924 ret = -EINVAL; 2925 goto error1; 2926 } 2927 2928 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 2929 ret = cm_alloc_msg(cm_id_priv, &msg); 2930 if (ret) 2931 goto error1; 2932 2933 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2934 msg_response, service_timeout, 2935 private_data, private_data_len); 2936 ret = ib_post_send_mad(msg, NULL); 2937 if (ret) 2938 goto error2; 2939 } 2940 2941 cm_id->state = cm_state; 2942 cm_id->lap_state = lap_state; 2943 cm_id_priv->service_timeout = service_timeout; 2944 cm_set_private_data(cm_id_priv, data, private_data_len); 2945 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2946 return 0; 2947 2948 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2949 kfree(data); 2950 return ret; 2951 2952 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2953 kfree(data); 2954 cm_free_msg(msg); 2955 return ret; 2956 } 2957 EXPORT_SYMBOL(ib_send_cm_mra); 2958 2959 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2960 { 2961 switch (cm_mra_get_msg_mraed(mra_msg)) { 2962 case CM_MSG_RESPONSE_REQ: 2963 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2964 case CM_MSG_RESPONSE_REP: 2965 case CM_MSG_RESPONSE_OTHER: 2966 return cm_acquire_id(mra_msg->remote_comm_id, 2967 mra_msg->local_comm_id); 2968 default: 2969 return NULL; 2970 } 2971 } 2972 2973 static int cm_mra_handler(struct cm_work *work) 2974 { 2975 struct cm_id_private *cm_id_priv; 2976 struct cm_mra_msg *mra_msg; 2977 int timeout, ret; 2978 2979 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2980 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2981 if (!cm_id_priv) 2982 return -EINVAL; 2983 2984 work->cm_event.private_data = &mra_msg->private_data; 2985 work->cm_event.param.mra_rcvd.service_timeout = 2986 cm_mra_get_service_timeout(mra_msg); 2987 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2988 cm_convert_to_ms(cm_id_priv->av.timeout); 2989 2990 spin_lock_irq(&cm_id_priv->lock); 2991 switch (cm_id_priv->id.state) { 2992 case IB_CM_REQ_SENT: 2993 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2994 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2995 cm_id_priv->msg, timeout)) 2996 goto out; 2997 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2998 break; 2999 case IB_CM_REP_SENT: 3000 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 3001 ib_modify_mad(cm_id_priv->av.port->mad_agent, 3002 cm_id_priv->msg, timeout)) 3003 goto out; 3004 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 3005 break; 3006 case IB_CM_ESTABLISHED: 3007 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 3008 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 3009 ib_modify_mad(cm_id_priv->av.port->mad_agent, 3010 cm_id_priv->msg, timeout)) { 3011 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 3012 atomic_long_inc(&work->port-> 3013 counter_group[CM_RECV_DUPLICATES]. 3014 counter[CM_MRA_COUNTER]); 3015 goto out; 3016 } 3017 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 3018 break; 3019 case IB_CM_MRA_REQ_RCVD: 3020 case IB_CM_MRA_REP_RCVD: 3021 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3022 counter[CM_MRA_COUNTER]); 3023 /* fall through */ 3024 default: 3025 goto out; 3026 } 3027 3028 cm_id_priv->msg->context[1] = (void *) (unsigned long) 3029 cm_id_priv->id.state; 3030 ret = atomic_inc_and_test(&cm_id_priv->work_count); 3031 if (!ret) 3032 list_add_tail(&work->list, &cm_id_priv->work_list); 3033 spin_unlock_irq(&cm_id_priv->lock); 3034 3035 if (ret) 3036 cm_process_work(cm_id_priv, work); 3037 else 3038 cm_deref_id(cm_id_priv); 3039 return 0; 3040 out: 3041 spin_unlock_irq(&cm_id_priv->lock); 3042 cm_deref_id(cm_id_priv); 3043 return -EINVAL; 3044 } 3045 3046 static void cm_format_lap(struct cm_lap_msg *lap_msg, 3047 struct cm_id_private *cm_id_priv, 3048 struct sa_path_rec *alternate_path, 3049 const void *private_data, 3050 u8 private_data_len) 3051 { 3052 bool alt_ext = false; 3053 3054 if (alternate_path->rec_type == SA_PATH_REC_TYPE_OPA) 3055 alt_ext = opa_is_extended_lid(alternate_path->opa.dlid, 3056 alternate_path->opa.slid); 3057 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 3058 cm_form_tid(cm_id_priv)); 3059 lap_msg->local_comm_id = cm_id_priv->id.local_id; 3060 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 3061 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 3062 /* todo: need remote CM response timeout */ 3063 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 3064 lap_msg->alt_local_lid = 3065 htons(ntohl(sa_path_get_slid(alternate_path))); 3066 lap_msg->alt_remote_lid = 3067 htons(ntohl(sa_path_get_dlid(alternate_path))); 3068 lap_msg->alt_local_gid = alternate_path->sgid; 3069 lap_msg->alt_remote_gid = alternate_path->dgid; 3070 if (alt_ext) { 3071 lap_msg->alt_local_gid.global.interface_id 3072 = OPA_MAKE_ID(be32_to_cpu(alternate_path->opa.slid)); 3073 lap_msg->alt_remote_gid.global.interface_id 3074 = OPA_MAKE_ID(be32_to_cpu(alternate_path->opa.dlid)); 3075 } 3076 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 3077 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 3078 lap_msg->alt_hop_limit = alternate_path->hop_limit; 3079 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 3080 cm_lap_set_sl(lap_msg, alternate_path->sl); 3081 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 3082 cm_lap_set_local_ack_timeout(lap_msg, 3083 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 3084 alternate_path->packet_life_time)); 3085 3086 if (private_data && private_data_len) 3087 memcpy(lap_msg->private_data, private_data, private_data_len); 3088 } 3089 3090 int ib_send_cm_lap(struct ib_cm_id *cm_id, 3091 struct sa_path_rec *alternate_path, 3092 const void *private_data, 3093 u8 private_data_len) 3094 { 3095 struct cm_id_private *cm_id_priv; 3096 struct ib_mad_send_buf *msg; 3097 unsigned long flags; 3098 int ret; 3099 3100 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 3101 return -EINVAL; 3102 3103 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3104 spin_lock_irqsave(&cm_id_priv->lock, flags); 3105 if (cm_id->state != IB_CM_ESTABLISHED || 3106 (cm_id->lap_state != IB_CM_LAP_UNINIT && 3107 cm_id->lap_state != IB_CM_LAP_IDLE)) { 3108 ret = -EINVAL; 3109 goto out; 3110 } 3111 3112 ret = cm_init_av_by_path(alternate_path, NULL, &cm_id_priv->alt_av, 3113 cm_id_priv); 3114 if (ret) 3115 goto out; 3116 cm_id_priv->alt_av.timeout = 3117 cm_ack_timeout(cm_id_priv->target_ack_delay, 3118 cm_id_priv->alt_av.timeout - 1); 3119 3120 ret = cm_alloc_msg(cm_id_priv, &msg); 3121 if (ret) 3122 goto out; 3123 3124 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 3125 alternate_path, private_data, private_data_len); 3126 msg->timeout_ms = cm_id_priv->timeout_ms; 3127 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 3128 3129 ret = ib_post_send_mad(msg, NULL); 3130 if (ret) { 3131 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3132 cm_free_msg(msg); 3133 return ret; 3134 } 3135 3136 cm_id->lap_state = IB_CM_LAP_SENT; 3137 cm_id_priv->msg = msg; 3138 3139 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3140 return ret; 3141 } 3142 EXPORT_SYMBOL(ib_send_cm_lap); 3143 3144 static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg, 3145 struct sa_path_rec *path) 3146 { 3147 u32 lid; 3148 3149 if (path->rec_type != SA_PATH_REC_TYPE_OPA) { 3150 sa_path_set_dlid(path, htonl(ntohs(lap_msg->alt_local_lid))); 3151 sa_path_set_slid(path, htonl(ntohs(lap_msg->alt_remote_lid))); 3152 } else { 3153 lid = opa_get_lid_from_gid(&lap_msg->alt_local_gid); 3154 sa_path_set_dlid(path, cpu_to_be32(lid)); 3155 3156 lid = opa_get_lid_from_gid(&lap_msg->alt_remote_gid); 3157 sa_path_set_slid(path, cpu_to_be32(lid)); 3158 } 3159 } 3160 3161 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 3162 struct sa_path_rec *path, 3163 struct cm_lap_msg *lap_msg) 3164 { 3165 path->dgid = lap_msg->alt_local_gid; 3166 path->sgid = lap_msg->alt_remote_gid; 3167 path->flow_label = cm_lap_get_flow_label(lap_msg); 3168 path->hop_limit = lap_msg->alt_hop_limit; 3169 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 3170 path->reversible = 1; 3171 path->pkey = cm_id_priv->pkey; 3172 path->sl = cm_lap_get_sl(lap_msg); 3173 path->mtu_selector = IB_SA_EQ; 3174 path->mtu = cm_id_priv->path_mtu; 3175 path->rate_selector = IB_SA_EQ; 3176 path->rate = cm_lap_get_packet_rate(lap_msg); 3177 path->packet_life_time_selector = IB_SA_EQ; 3178 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 3179 path->packet_life_time -= (path->packet_life_time > 0); 3180 cm_format_path_lid_from_lap(lap_msg, path); 3181 } 3182 3183 static int cm_lap_handler(struct cm_work *work) 3184 { 3185 struct cm_id_private *cm_id_priv; 3186 struct cm_lap_msg *lap_msg; 3187 struct ib_cm_lap_event_param *param; 3188 struct ib_mad_send_buf *msg = NULL; 3189 int ret; 3190 3191 /* Currently Alternate path messages are not supported for 3192 * RoCE link layer. 3193 */ 3194 if (rdma_protocol_roce(work->port->cm_dev->ib_device, 3195 work->port->port_num)) 3196 return -EINVAL; 3197 3198 /* todo: verify LAP request and send reject APR if invalid. */ 3199 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 3200 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 3201 lap_msg->local_comm_id); 3202 if (!cm_id_priv) 3203 return -EINVAL; 3204 3205 param = &work->cm_event.param.lap_rcvd; 3206 memset(&work->path[0], 0, sizeof(work->path[1])); 3207 cm_path_set_rec_type(work->port->cm_dev->ib_device, 3208 work->port->port_num, 3209 &work->path[0], 3210 &lap_msg->alt_local_gid); 3211 param->alternate_path = &work->path[0]; 3212 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 3213 work->cm_event.private_data = &lap_msg->private_data; 3214 3215 spin_lock_irq(&cm_id_priv->lock); 3216 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 3217 goto unlock; 3218 3219 switch (cm_id_priv->id.lap_state) { 3220 case IB_CM_LAP_UNINIT: 3221 case IB_CM_LAP_IDLE: 3222 break; 3223 case IB_CM_MRA_LAP_SENT: 3224 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3225 counter[CM_LAP_COUNTER]); 3226 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc); 3227 if (IS_ERR(msg)) 3228 goto unlock; 3229 3230 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 3231 CM_MSG_RESPONSE_OTHER, 3232 cm_id_priv->service_timeout, 3233 cm_id_priv->private_data, 3234 cm_id_priv->private_data_len); 3235 spin_unlock_irq(&cm_id_priv->lock); 3236 3237 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || 3238 ib_post_send_mad(msg, NULL)) 3239 cm_free_msg(msg); 3240 goto deref; 3241 case IB_CM_LAP_RCVD: 3242 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3243 counter[CM_LAP_COUNTER]); 3244 goto unlock; 3245 default: 3246 goto unlock; 3247 } 3248 3249 ret = cm_init_av_for_lap(work->port, work->mad_recv_wc->wc, 3250 work->mad_recv_wc->recv_buf.grh, 3251 &cm_id_priv->av); 3252 if (ret) 3253 goto unlock; 3254 3255 ret = cm_init_av_by_path(param->alternate_path, NULL, 3256 &cm_id_priv->alt_av, cm_id_priv); 3257 if (ret) 3258 goto unlock; 3259 3260 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 3261 cm_id_priv->tid = lap_msg->hdr.tid; 3262 ret = atomic_inc_and_test(&cm_id_priv->work_count); 3263 if (!ret) 3264 list_add_tail(&work->list, &cm_id_priv->work_list); 3265 spin_unlock_irq(&cm_id_priv->lock); 3266 3267 if (ret) 3268 cm_process_work(cm_id_priv, work); 3269 else 3270 cm_deref_id(cm_id_priv); 3271 return 0; 3272 3273 unlock: spin_unlock_irq(&cm_id_priv->lock); 3274 deref: cm_deref_id(cm_id_priv); 3275 return -EINVAL; 3276 } 3277 3278 static void cm_format_apr(struct cm_apr_msg *apr_msg, 3279 struct cm_id_private *cm_id_priv, 3280 enum ib_cm_apr_status status, 3281 void *info, 3282 u8 info_length, 3283 const void *private_data, 3284 u8 private_data_len) 3285 { 3286 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 3287 apr_msg->local_comm_id = cm_id_priv->id.local_id; 3288 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 3289 apr_msg->ap_status = (u8) status; 3290 3291 if (info && info_length) { 3292 apr_msg->info_length = info_length; 3293 memcpy(apr_msg->info, info, info_length); 3294 } 3295 3296 if (private_data && private_data_len) 3297 memcpy(apr_msg->private_data, private_data, private_data_len); 3298 } 3299 3300 int ib_send_cm_apr(struct ib_cm_id *cm_id, 3301 enum ib_cm_apr_status status, 3302 void *info, 3303 u8 info_length, 3304 const void *private_data, 3305 u8 private_data_len) 3306 { 3307 struct cm_id_private *cm_id_priv; 3308 struct ib_mad_send_buf *msg; 3309 unsigned long flags; 3310 int ret; 3311 3312 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 3313 (info && info_length > IB_CM_APR_INFO_LENGTH)) 3314 return -EINVAL; 3315 3316 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3317 spin_lock_irqsave(&cm_id_priv->lock, flags); 3318 if (cm_id->state != IB_CM_ESTABLISHED || 3319 (cm_id->lap_state != IB_CM_LAP_RCVD && 3320 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 3321 ret = -EINVAL; 3322 goto out; 3323 } 3324 3325 ret = cm_alloc_msg(cm_id_priv, &msg); 3326 if (ret) 3327 goto out; 3328 3329 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 3330 info, info_length, private_data, private_data_len); 3331 ret = ib_post_send_mad(msg, NULL); 3332 if (ret) { 3333 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3334 cm_free_msg(msg); 3335 return ret; 3336 } 3337 3338 cm_id->lap_state = IB_CM_LAP_IDLE; 3339 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3340 return ret; 3341 } 3342 EXPORT_SYMBOL(ib_send_cm_apr); 3343 3344 static int cm_apr_handler(struct cm_work *work) 3345 { 3346 struct cm_id_private *cm_id_priv; 3347 struct cm_apr_msg *apr_msg; 3348 int ret; 3349 3350 /* Currently Alternate path messages are not supported for 3351 * RoCE link layer. 3352 */ 3353 if (rdma_protocol_roce(work->port->cm_dev->ib_device, 3354 work->port->port_num)) 3355 return -EINVAL; 3356 3357 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 3358 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 3359 apr_msg->local_comm_id); 3360 if (!cm_id_priv) 3361 return -EINVAL; /* Unmatched reply. */ 3362 3363 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 3364 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 3365 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 3366 work->cm_event.private_data = &apr_msg->private_data; 3367 3368 spin_lock_irq(&cm_id_priv->lock); 3369 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 3370 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 3371 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 3372 spin_unlock_irq(&cm_id_priv->lock); 3373 goto out; 3374 } 3375 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 3376 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3377 cm_id_priv->msg = NULL; 3378 3379 ret = atomic_inc_and_test(&cm_id_priv->work_count); 3380 if (!ret) 3381 list_add_tail(&work->list, &cm_id_priv->work_list); 3382 spin_unlock_irq(&cm_id_priv->lock); 3383 3384 if (ret) 3385 cm_process_work(cm_id_priv, work); 3386 else 3387 cm_deref_id(cm_id_priv); 3388 return 0; 3389 out: 3390 cm_deref_id(cm_id_priv); 3391 return -EINVAL; 3392 } 3393 3394 static int cm_timewait_handler(struct cm_work *work) 3395 { 3396 struct cm_timewait_info *timewait_info; 3397 struct cm_id_private *cm_id_priv; 3398 int ret; 3399 3400 timewait_info = (struct cm_timewait_info *)work; 3401 spin_lock_irq(&cm.lock); 3402 list_del(&timewait_info->list); 3403 spin_unlock_irq(&cm.lock); 3404 3405 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 3406 timewait_info->work.remote_id); 3407 if (!cm_id_priv) 3408 return -EINVAL; 3409 3410 spin_lock_irq(&cm_id_priv->lock); 3411 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 3412 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 3413 spin_unlock_irq(&cm_id_priv->lock); 3414 goto out; 3415 } 3416 cm_id_priv->id.state = IB_CM_IDLE; 3417 ret = atomic_inc_and_test(&cm_id_priv->work_count); 3418 if (!ret) 3419 list_add_tail(&work->list, &cm_id_priv->work_list); 3420 spin_unlock_irq(&cm_id_priv->lock); 3421 3422 if (ret) 3423 cm_process_work(cm_id_priv, work); 3424 else 3425 cm_deref_id(cm_id_priv); 3426 return 0; 3427 out: 3428 cm_deref_id(cm_id_priv); 3429 return -EINVAL; 3430 } 3431 3432 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 3433 struct cm_id_private *cm_id_priv, 3434 struct ib_cm_sidr_req_param *param) 3435 { 3436 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 3437 cm_form_tid(cm_id_priv)); 3438 sidr_req_msg->request_id = cm_id_priv->id.local_id; 3439 sidr_req_msg->pkey = param->path->pkey; 3440 sidr_req_msg->service_id = param->service_id; 3441 3442 if (param->private_data && param->private_data_len) 3443 memcpy(sidr_req_msg->private_data, param->private_data, 3444 param->private_data_len); 3445 } 3446 3447 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 3448 struct ib_cm_sidr_req_param *param) 3449 { 3450 struct cm_id_private *cm_id_priv; 3451 struct ib_mad_send_buf *msg; 3452 unsigned long flags; 3453 int ret; 3454 3455 if (!param->path || (param->private_data && 3456 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 3457 return -EINVAL; 3458 3459 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3460 ret = cm_init_av_by_path(param->path, param->sgid_attr, 3461 &cm_id_priv->av, 3462 cm_id_priv); 3463 if (ret) 3464 goto out; 3465 3466 cm_id->service_id = param->service_id; 3467 cm_id->service_mask = ~cpu_to_be64(0); 3468 cm_id_priv->timeout_ms = param->timeout_ms; 3469 cm_id_priv->max_cm_retries = param->max_cm_retries; 3470 ret = cm_alloc_msg(cm_id_priv, &msg); 3471 if (ret) 3472 goto out; 3473 3474 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 3475 param); 3476 msg->timeout_ms = cm_id_priv->timeout_ms; 3477 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 3478 3479 spin_lock_irqsave(&cm_id_priv->lock, flags); 3480 if (cm_id->state == IB_CM_IDLE) 3481 ret = ib_post_send_mad(msg, NULL); 3482 else 3483 ret = -EINVAL; 3484 3485 if (ret) { 3486 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3487 cm_free_msg(msg); 3488 goto out; 3489 } 3490 cm_id->state = IB_CM_SIDR_REQ_SENT; 3491 cm_id_priv->msg = msg; 3492 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3493 out: 3494 return ret; 3495 } 3496 EXPORT_SYMBOL(ib_send_cm_sidr_req); 3497 3498 static void cm_format_sidr_req_event(struct cm_work *work, 3499 const struct cm_id_private *rx_cm_id, 3500 struct ib_cm_id *listen_id) 3501 { 3502 struct cm_sidr_req_msg *sidr_req_msg; 3503 struct ib_cm_sidr_req_event_param *param; 3504 3505 sidr_req_msg = (struct cm_sidr_req_msg *) 3506 work->mad_recv_wc->recv_buf.mad; 3507 param = &work->cm_event.param.sidr_req_rcvd; 3508 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 3509 param->listen_id = listen_id; 3510 param->service_id = sidr_req_msg->service_id; 3511 param->bth_pkey = cm_get_bth_pkey(work); 3512 param->port = work->port->port_num; 3513 param->sgid_attr = rx_cm_id->av.ah_attr.grh.sgid_attr; 3514 work->cm_event.private_data = &sidr_req_msg->private_data; 3515 } 3516 3517 static int cm_sidr_req_handler(struct cm_work *work) 3518 { 3519 struct ib_cm_id *cm_id; 3520 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 3521 struct cm_sidr_req_msg *sidr_req_msg; 3522 struct ib_wc *wc; 3523 int ret; 3524 3525 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 3526 if (IS_ERR(cm_id)) 3527 return PTR_ERR(cm_id); 3528 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3529 3530 /* Record SGID/SLID and request ID for lookup. */ 3531 sidr_req_msg = (struct cm_sidr_req_msg *) 3532 work->mad_recv_wc->recv_buf.mad; 3533 wc = work->mad_recv_wc->wc; 3534 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 3535 cm_id_priv->av.dgid.global.interface_id = 0; 3536 ret = cm_init_av_for_lap(work->port, work->mad_recv_wc->wc, 3537 work->mad_recv_wc->recv_buf.grh, 3538 &cm_id_priv->av); 3539 if (ret) 3540 goto out; 3541 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 3542 cm_id_priv->tid = sidr_req_msg->hdr.tid; 3543 atomic_inc(&cm_id_priv->work_count); 3544 3545 spin_lock_irq(&cm.lock); 3546 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 3547 if (cur_cm_id_priv) { 3548 spin_unlock_irq(&cm.lock); 3549 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3550 counter[CM_SIDR_REQ_COUNTER]); 3551 goto out; /* Duplicate message. */ 3552 } 3553 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3554 cur_cm_id_priv = cm_find_listen(cm_id->device, 3555 sidr_req_msg->service_id); 3556 if (!cur_cm_id_priv) { 3557 spin_unlock_irq(&cm.lock); 3558 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED); 3559 goto out; /* No match. */ 3560 } 3561 atomic_inc(&cur_cm_id_priv->refcount); 3562 atomic_inc(&cm_id_priv->refcount); 3563 spin_unlock_irq(&cm.lock); 3564 3565 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 3566 cm_id_priv->id.context = cur_cm_id_priv->id.context; 3567 cm_id_priv->id.service_id = sidr_req_msg->service_id; 3568 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 3569 3570 cm_format_sidr_req_event(work, cm_id_priv, &cur_cm_id_priv->id); 3571 cm_process_work(cm_id_priv, work); 3572 cm_deref_id(cur_cm_id_priv); 3573 return 0; 3574 out: 3575 ib_destroy_cm_id(&cm_id_priv->id); 3576 return -EINVAL; 3577 } 3578 3579 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3580 struct cm_id_private *cm_id_priv, 3581 struct ib_cm_sidr_rep_param *param) 3582 { 3583 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3584 cm_id_priv->tid); 3585 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 3586 sidr_rep_msg->status = param->status; 3587 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 3588 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 3589 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 3590 3591 if (param->info && param->info_length) 3592 memcpy(sidr_rep_msg->info, param->info, param->info_length); 3593 3594 if (param->private_data && param->private_data_len) 3595 memcpy(sidr_rep_msg->private_data, param->private_data, 3596 param->private_data_len); 3597 } 3598 3599 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3600 struct ib_cm_sidr_rep_param *param) 3601 { 3602 struct cm_id_private *cm_id_priv; 3603 struct ib_mad_send_buf *msg; 3604 unsigned long flags; 3605 int ret; 3606 3607 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3608 (param->private_data && 3609 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3610 return -EINVAL; 3611 3612 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3613 spin_lock_irqsave(&cm_id_priv->lock, flags); 3614 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 3615 ret = -EINVAL; 3616 goto error; 3617 } 3618 3619 ret = cm_alloc_msg(cm_id_priv, &msg); 3620 if (ret) 3621 goto error; 3622 3623 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3624 param); 3625 ret = ib_post_send_mad(msg, NULL); 3626 if (ret) { 3627 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3628 cm_free_msg(msg); 3629 return ret; 3630 } 3631 cm_id->state = IB_CM_IDLE; 3632 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3633 3634 spin_lock_irqsave(&cm.lock, flags); 3635 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) { 3636 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3637 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); 3638 } 3639 spin_unlock_irqrestore(&cm.lock, flags); 3640 return 0; 3641 3642 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3643 return ret; 3644 } 3645 EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3646 3647 static void cm_format_sidr_rep_event(struct cm_work *work, 3648 const struct cm_id_private *cm_id_priv) 3649 { 3650 struct cm_sidr_rep_msg *sidr_rep_msg; 3651 struct ib_cm_sidr_rep_event_param *param; 3652 3653 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3654 work->mad_recv_wc->recv_buf.mad; 3655 param = &work->cm_event.param.sidr_rep_rcvd; 3656 param->status = sidr_rep_msg->status; 3657 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 3658 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 3659 param->info = &sidr_rep_msg->info; 3660 param->info_len = sidr_rep_msg->info_length; 3661 param->sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr; 3662 work->cm_event.private_data = &sidr_rep_msg->private_data; 3663 } 3664 3665 static int cm_sidr_rep_handler(struct cm_work *work) 3666 { 3667 struct cm_sidr_rep_msg *sidr_rep_msg; 3668 struct cm_id_private *cm_id_priv; 3669 3670 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3671 work->mad_recv_wc->recv_buf.mad; 3672 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 3673 if (!cm_id_priv) 3674 return -EINVAL; /* Unmatched reply. */ 3675 3676 spin_lock_irq(&cm_id_priv->lock); 3677 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3678 spin_unlock_irq(&cm_id_priv->lock); 3679 goto out; 3680 } 3681 cm_id_priv->id.state = IB_CM_IDLE; 3682 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3683 spin_unlock_irq(&cm_id_priv->lock); 3684 3685 cm_format_sidr_rep_event(work, cm_id_priv); 3686 cm_process_work(cm_id_priv, work); 3687 return 0; 3688 out: 3689 cm_deref_id(cm_id_priv); 3690 return -EINVAL; 3691 } 3692 3693 static void cm_process_send_error(struct ib_mad_send_buf *msg, 3694 enum ib_wc_status wc_status) 3695 { 3696 struct cm_id_private *cm_id_priv; 3697 struct ib_cm_event cm_event; 3698 enum ib_cm_state state; 3699 int ret; 3700 3701 memset(&cm_event, 0, sizeof cm_event); 3702 cm_id_priv = msg->context[0]; 3703 3704 /* Discard old sends or ones without a response. */ 3705 spin_lock_irq(&cm_id_priv->lock); 3706 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3707 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3708 goto discard; 3709 3710 switch (state) { 3711 case IB_CM_REQ_SENT: 3712 case IB_CM_MRA_REQ_RCVD: 3713 cm_reset_to_idle(cm_id_priv); 3714 cm_event.event = IB_CM_REQ_ERROR; 3715 break; 3716 case IB_CM_REP_SENT: 3717 case IB_CM_MRA_REP_RCVD: 3718 cm_reset_to_idle(cm_id_priv); 3719 cm_event.event = IB_CM_REP_ERROR; 3720 break; 3721 case IB_CM_DREQ_SENT: 3722 cm_enter_timewait(cm_id_priv); 3723 cm_event.event = IB_CM_DREQ_ERROR; 3724 break; 3725 case IB_CM_SIDR_REQ_SENT: 3726 cm_id_priv->id.state = IB_CM_IDLE; 3727 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3728 break; 3729 default: 3730 goto discard; 3731 } 3732 spin_unlock_irq(&cm_id_priv->lock); 3733 cm_event.param.send_status = wc_status; 3734 3735 /* No other events can occur on the cm_id at this point. */ 3736 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3737 cm_free_msg(msg); 3738 if (ret) 3739 ib_destroy_cm_id(&cm_id_priv->id); 3740 return; 3741 discard: 3742 spin_unlock_irq(&cm_id_priv->lock); 3743 cm_free_msg(msg); 3744 } 3745 3746 static void cm_send_handler(struct ib_mad_agent *mad_agent, 3747 struct ib_mad_send_wc *mad_send_wc) 3748 { 3749 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3750 struct cm_port *port; 3751 u16 attr_index; 3752 3753 port = mad_agent->context; 3754 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3755 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3756 3757 /* 3758 * If the send was in response to a received message (context[0] is not 3759 * set to a cm_id), and is not a REJ, then it is a send that was 3760 * manually retried. 3761 */ 3762 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3763 msg->retries = 1; 3764 3765 atomic_long_add(1 + msg->retries, 3766 &port->counter_group[CM_XMIT].counter[attr_index]); 3767 if (msg->retries) 3768 atomic_long_add(msg->retries, 3769 &port->counter_group[CM_XMIT_RETRIES]. 3770 counter[attr_index]); 3771 3772 switch (mad_send_wc->status) { 3773 case IB_WC_SUCCESS: 3774 case IB_WC_WR_FLUSH_ERR: 3775 cm_free_msg(msg); 3776 break; 3777 default: 3778 if (msg->context[0] && msg->context[1]) 3779 cm_process_send_error(msg, mad_send_wc->status); 3780 else 3781 cm_free_msg(msg); 3782 break; 3783 } 3784 } 3785 3786 static void cm_work_handler(struct work_struct *_work) 3787 { 3788 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3789 int ret; 3790 3791 switch (work->cm_event.event) { 3792 case IB_CM_REQ_RECEIVED: 3793 ret = cm_req_handler(work); 3794 break; 3795 case IB_CM_MRA_RECEIVED: 3796 ret = cm_mra_handler(work); 3797 break; 3798 case IB_CM_REJ_RECEIVED: 3799 ret = cm_rej_handler(work); 3800 break; 3801 case IB_CM_REP_RECEIVED: 3802 ret = cm_rep_handler(work); 3803 break; 3804 case IB_CM_RTU_RECEIVED: 3805 ret = cm_rtu_handler(work); 3806 break; 3807 case IB_CM_USER_ESTABLISHED: 3808 ret = cm_establish_handler(work); 3809 break; 3810 case IB_CM_DREQ_RECEIVED: 3811 ret = cm_dreq_handler(work); 3812 break; 3813 case IB_CM_DREP_RECEIVED: 3814 ret = cm_drep_handler(work); 3815 break; 3816 case IB_CM_SIDR_REQ_RECEIVED: 3817 ret = cm_sidr_req_handler(work); 3818 break; 3819 case IB_CM_SIDR_REP_RECEIVED: 3820 ret = cm_sidr_rep_handler(work); 3821 break; 3822 case IB_CM_LAP_RECEIVED: 3823 ret = cm_lap_handler(work); 3824 break; 3825 case IB_CM_APR_RECEIVED: 3826 ret = cm_apr_handler(work); 3827 break; 3828 case IB_CM_TIMEWAIT_EXIT: 3829 ret = cm_timewait_handler(work); 3830 break; 3831 default: 3832 ret = -EINVAL; 3833 break; 3834 } 3835 if (ret) 3836 cm_free_work(work); 3837 } 3838 3839 static int cm_establish(struct ib_cm_id *cm_id) 3840 { 3841 struct cm_id_private *cm_id_priv; 3842 struct cm_work *work; 3843 unsigned long flags; 3844 int ret = 0; 3845 struct cm_device *cm_dev; 3846 3847 cm_dev = ib_get_client_data(cm_id->device, &cm_client); 3848 if (!cm_dev) 3849 return -ENODEV; 3850 3851 work = kmalloc(sizeof *work, GFP_ATOMIC); 3852 if (!work) 3853 return -ENOMEM; 3854 3855 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3856 spin_lock_irqsave(&cm_id_priv->lock, flags); 3857 switch (cm_id->state) 3858 { 3859 case IB_CM_REP_SENT: 3860 case IB_CM_MRA_REP_RCVD: 3861 cm_id->state = IB_CM_ESTABLISHED; 3862 break; 3863 case IB_CM_ESTABLISHED: 3864 ret = -EISCONN; 3865 break; 3866 default: 3867 ret = -EINVAL; 3868 break; 3869 } 3870 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3871 3872 if (ret) { 3873 kfree(work); 3874 goto out; 3875 } 3876 3877 /* 3878 * The CM worker thread may try to destroy the cm_id before it 3879 * can execute this work item. To prevent potential deadlock, 3880 * we need to find the cm_id once we're in the context of the 3881 * worker thread, rather than holding a reference on it. 3882 */ 3883 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3884 work->local_id = cm_id->local_id; 3885 work->remote_id = cm_id->remote_id; 3886 work->mad_recv_wc = NULL; 3887 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3888 3889 /* Check if the device started its remove_one */ 3890 spin_lock_irqsave(&cm.lock, flags); 3891 if (!cm_dev->going_down) { 3892 queue_delayed_work(cm.wq, &work->work, 0); 3893 } else { 3894 kfree(work); 3895 ret = -ENODEV; 3896 } 3897 spin_unlock_irqrestore(&cm.lock, flags); 3898 3899 out: 3900 return ret; 3901 } 3902 3903 static int cm_migrate(struct ib_cm_id *cm_id) 3904 { 3905 struct cm_id_private *cm_id_priv; 3906 struct cm_av tmp_av; 3907 unsigned long flags; 3908 int tmp_send_port_not_ready; 3909 int ret = 0; 3910 3911 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3912 spin_lock_irqsave(&cm_id_priv->lock, flags); 3913 if (cm_id->state == IB_CM_ESTABLISHED && 3914 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3915 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3916 cm_id->lap_state = IB_CM_LAP_IDLE; 3917 /* Swap address vector */ 3918 tmp_av = cm_id_priv->av; 3919 cm_id_priv->av = cm_id_priv->alt_av; 3920 cm_id_priv->alt_av = tmp_av; 3921 /* Swap port send ready state */ 3922 tmp_send_port_not_ready = cm_id_priv->prim_send_port_not_ready; 3923 cm_id_priv->prim_send_port_not_ready = cm_id_priv->altr_send_port_not_ready; 3924 cm_id_priv->altr_send_port_not_ready = tmp_send_port_not_ready; 3925 } else 3926 ret = -EINVAL; 3927 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3928 3929 return ret; 3930 } 3931 3932 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3933 { 3934 int ret; 3935 3936 switch (event) { 3937 case IB_EVENT_COMM_EST: 3938 ret = cm_establish(cm_id); 3939 break; 3940 case IB_EVENT_PATH_MIG: 3941 ret = cm_migrate(cm_id); 3942 break; 3943 default: 3944 ret = -EINVAL; 3945 } 3946 return ret; 3947 } 3948 EXPORT_SYMBOL(ib_cm_notify); 3949 3950 static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3951 struct ib_mad_send_buf *send_buf, 3952 struct ib_mad_recv_wc *mad_recv_wc) 3953 { 3954 struct cm_port *port = mad_agent->context; 3955 struct cm_work *work; 3956 enum ib_cm_event_type event; 3957 bool alt_path = false; 3958 u16 attr_id; 3959 int paths = 0; 3960 int going_down = 0; 3961 3962 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3963 case CM_REQ_ATTR_ID: 3964 alt_path = cm_req_has_alt_path((struct cm_req_msg *) 3965 mad_recv_wc->recv_buf.mad); 3966 paths = 1 + (alt_path != 0); 3967 event = IB_CM_REQ_RECEIVED; 3968 break; 3969 case CM_MRA_ATTR_ID: 3970 event = IB_CM_MRA_RECEIVED; 3971 break; 3972 case CM_REJ_ATTR_ID: 3973 event = IB_CM_REJ_RECEIVED; 3974 break; 3975 case CM_REP_ATTR_ID: 3976 event = IB_CM_REP_RECEIVED; 3977 break; 3978 case CM_RTU_ATTR_ID: 3979 event = IB_CM_RTU_RECEIVED; 3980 break; 3981 case CM_DREQ_ATTR_ID: 3982 event = IB_CM_DREQ_RECEIVED; 3983 break; 3984 case CM_DREP_ATTR_ID: 3985 event = IB_CM_DREP_RECEIVED; 3986 break; 3987 case CM_SIDR_REQ_ATTR_ID: 3988 event = IB_CM_SIDR_REQ_RECEIVED; 3989 break; 3990 case CM_SIDR_REP_ATTR_ID: 3991 event = IB_CM_SIDR_REP_RECEIVED; 3992 break; 3993 case CM_LAP_ATTR_ID: 3994 paths = 1; 3995 event = IB_CM_LAP_RECEIVED; 3996 break; 3997 case CM_APR_ATTR_ID: 3998 event = IB_CM_APR_RECEIVED; 3999 break; 4000 default: 4001 ib_free_recv_mad(mad_recv_wc); 4002 return; 4003 } 4004 4005 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 4006 atomic_long_inc(&port->counter_group[CM_RECV]. 4007 counter[attr_id - CM_ATTR_ID_OFFSET]); 4008 4009 work = kmalloc(sizeof(*work) + sizeof(struct sa_path_rec) * paths, 4010 GFP_KERNEL); 4011 if (!work) { 4012 ib_free_recv_mad(mad_recv_wc); 4013 return; 4014 } 4015 4016 INIT_DELAYED_WORK(&work->work, cm_work_handler); 4017 work->cm_event.event = event; 4018 work->mad_recv_wc = mad_recv_wc; 4019 work->port = port; 4020 4021 /* Check if the device started its remove_one */ 4022 spin_lock_irq(&cm.lock); 4023 if (!port->cm_dev->going_down) 4024 queue_delayed_work(cm.wq, &work->work, 0); 4025 else 4026 going_down = 1; 4027 spin_unlock_irq(&cm.lock); 4028 4029 if (going_down) { 4030 kfree(work); 4031 ib_free_recv_mad(mad_recv_wc); 4032 } 4033 } 4034 4035 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 4036 struct ib_qp_attr *qp_attr, 4037 int *qp_attr_mask) 4038 { 4039 unsigned long flags; 4040 int ret; 4041 4042 spin_lock_irqsave(&cm_id_priv->lock, flags); 4043 switch (cm_id_priv->id.state) { 4044 case IB_CM_REQ_SENT: 4045 case IB_CM_MRA_REQ_RCVD: 4046 case IB_CM_REQ_RCVD: 4047 case IB_CM_MRA_REQ_SENT: 4048 case IB_CM_REP_RCVD: 4049 case IB_CM_MRA_REP_SENT: 4050 case IB_CM_REP_SENT: 4051 case IB_CM_MRA_REP_RCVD: 4052 case IB_CM_ESTABLISHED: 4053 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 4054 IB_QP_PKEY_INDEX | IB_QP_PORT; 4055 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 4056 if (cm_id_priv->responder_resources) 4057 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 4058 IB_ACCESS_REMOTE_ATOMIC; 4059 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 4060 qp_attr->port_num = cm_id_priv->av.port->port_num; 4061 ret = 0; 4062 break; 4063 default: 4064 ret = -EINVAL; 4065 break; 4066 } 4067 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4068 return ret; 4069 } 4070 4071 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 4072 struct ib_qp_attr *qp_attr, 4073 int *qp_attr_mask) 4074 { 4075 unsigned long flags; 4076 int ret; 4077 4078 spin_lock_irqsave(&cm_id_priv->lock, flags); 4079 switch (cm_id_priv->id.state) { 4080 case IB_CM_REQ_RCVD: 4081 case IB_CM_MRA_REQ_SENT: 4082 case IB_CM_REP_RCVD: 4083 case IB_CM_MRA_REP_SENT: 4084 case IB_CM_REP_SENT: 4085 case IB_CM_MRA_REP_RCVD: 4086 case IB_CM_ESTABLISHED: 4087 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 4088 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 4089 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 4090 qp_attr->path_mtu = cm_id_priv->path_mtu; 4091 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 4092 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 4093 if (cm_id_priv->qp_type == IB_QPT_RC || 4094 cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 4095 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 4096 IB_QP_MIN_RNR_TIMER; 4097 qp_attr->max_dest_rd_atomic = 4098 cm_id_priv->responder_resources; 4099 qp_attr->min_rnr_timer = 0; 4100 } 4101 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) { 4102 *qp_attr_mask |= IB_QP_ALT_PATH; 4103 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 4104 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 4105 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 4106 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 4107 } 4108 ret = 0; 4109 break; 4110 default: 4111 ret = -EINVAL; 4112 break; 4113 } 4114 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4115 return ret; 4116 } 4117 4118 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 4119 struct ib_qp_attr *qp_attr, 4120 int *qp_attr_mask) 4121 { 4122 unsigned long flags; 4123 int ret; 4124 4125 spin_lock_irqsave(&cm_id_priv->lock, flags); 4126 switch (cm_id_priv->id.state) { 4127 /* Allow transition to RTS before sending REP */ 4128 case IB_CM_REQ_RCVD: 4129 case IB_CM_MRA_REQ_SENT: 4130 4131 case IB_CM_REP_RCVD: 4132 case IB_CM_MRA_REP_SENT: 4133 case IB_CM_REP_SENT: 4134 case IB_CM_MRA_REP_RCVD: 4135 case IB_CM_ESTABLISHED: 4136 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 4137 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 4138 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 4139 switch (cm_id_priv->qp_type) { 4140 case IB_QPT_RC: 4141 case IB_QPT_XRC_INI: 4142 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY | 4143 IB_QP_MAX_QP_RD_ATOMIC; 4144 qp_attr->retry_cnt = cm_id_priv->retry_count; 4145 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 4146 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 4147 /* fall through */ 4148 case IB_QPT_XRC_TGT: 4149 *qp_attr_mask |= IB_QP_TIMEOUT; 4150 qp_attr->timeout = cm_id_priv->av.timeout; 4151 break; 4152 default: 4153 break; 4154 } 4155 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) { 4156 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 4157 qp_attr->path_mig_state = IB_MIG_REARM; 4158 } 4159 } else { 4160 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 4161 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 4162 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 4163 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 4164 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 4165 qp_attr->path_mig_state = IB_MIG_REARM; 4166 } 4167 ret = 0; 4168 break; 4169 default: 4170 ret = -EINVAL; 4171 break; 4172 } 4173 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 4174 return ret; 4175 } 4176 4177 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 4178 struct ib_qp_attr *qp_attr, 4179 int *qp_attr_mask) 4180 { 4181 struct cm_id_private *cm_id_priv; 4182 int ret; 4183 4184 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 4185 switch (qp_attr->qp_state) { 4186 case IB_QPS_INIT: 4187 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 4188 break; 4189 case IB_QPS_RTR: 4190 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 4191 break; 4192 case IB_QPS_RTS: 4193 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 4194 break; 4195 default: 4196 ret = -EINVAL; 4197 break; 4198 } 4199 return ret; 4200 } 4201 EXPORT_SYMBOL(ib_cm_init_qp_attr); 4202 4203 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 4204 char *buf) 4205 { 4206 struct cm_counter_group *group; 4207 struct cm_counter_attribute *cm_attr; 4208 4209 group = container_of(obj, struct cm_counter_group, obj); 4210 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 4211 4212 return sprintf(buf, "%ld\n", 4213 atomic_long_read(&group->counter[cm_attr->index])); 4214 } 4215 4216 static const struct sysfs_ops cm_counter_ops = { 4217 .show = cm_show_counter 4218 }; 4219 4220 static struct kobj_type cm_counter_obj_type = { 4221 .sysfs_ops = &cm_counter_ops, 4222 .default_attrs = cm_counter_default_attrs 4223 }; 4224 4225 static char *cm_devnode(struct device *dev, umode_t *mode) 4226 { 4227 if (mode) 4228 *mode = 0666; 4229 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 4230 } 4231 4232 struct class cm_class = { 4233 .name = "infiniband_cm", 4234 .devnode = cm_devnode, 4235 }; 4236 EXPORT_SYMBOL(cm_class); 4237 4238 static int cm_create_port_fs(struct cm_port *port) 4239 { 4240 int i, ret; 4241 4242 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 4243 ret = ib_port_register_module_stat(port->cm_dev->ib_device, 4244 port->port_num, 4245 &port->counter_group[i].obj, 4246 &cm_counter_obj_type, 4247 counter_group_names[i]); 4248 if (ret) 4249 goto error; 4250 } 4251 4252 return 0; 4253 4254 error: 4255 while (i--) 4256 ib_port_unregister_module_stat(&port->counter_group[i].obj); 4257 return ret; 4258 4259 } 4260 4261 static void cm_remove_port_fs(struct cm_port *port) 4262 { 4263 int i; 4264 4265 for (i = 0; i < CM_COUNTER_GROUPS; i++) 4266 ib_port_unregister_module_stat(&port->counter_group[i].obj); 4267 4268 } 4269 4270 static void cm_add_one(struct ib_device *ib_device) 4271 { 4272 struct cm_device *cm_dev; 4273 struct cm_port *port; 4274 struct ib_mad_reg_req reg_req = { 4275 .mgmt_class = IB_MGMT_CLASS_CM, 4276 .mgmt_class_version = IB_CM_CLASS_VERSION, 4277 }; 4278 struct ib_port_modify port_modify = { 4279 .set_port_cap_mask = IB_PORT_CM_SUP 4280 }; 4281 unsigned long flags __writeonly; 4282 int ret; 4283 int count = 0; 4284 u8 i; 4285 4286 cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt), 4287 GFP_KERNEL); 4288 if (!cm_dev) 4289 return; 4290 4291 cm_dev->ib_device = ib_device; 4292 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay; 4293 cm_dev->going_down = 0; 4294 4295 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 4296 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 4297 if (!rdma_cap_ib_cm(ib_device, i)) 4298 continue; 4299 4300 port = kzalloc(sizeof *port, GFP_KERNEL); 4301 if (!port) 4302 goto error1; 4303 4304 cm_dev->port[i-1] = port; 4305 port->cm_dev = cm_dev; 4306 port->port_num = i; 4307 4308 INIT_LIST_HEAD(&port->cm_priv_prim_list); 4309 INIT_LIST_HEAD(&port->cm_priv_altr_list); 4310 4311 ret = cm_create_port_fs(port); 4312 if (ret) 4313 goto error1; 4314 4315 port->mad_agent = ib_register_mad_agent(ib_device, i, 4316 IB_QPT_GSI, 4317 ®_req, 4318 0, 4319 cm_send_handler, 4320 cm_recv_handler, 4321 port, 4322 0); 4323 if (IS_ERR(port->mad_agent)) 4324 goto error2; 4325 4326 ret = ib_modify_port(ib_device, i, 0, &port_modify); 4327 if (ret) 4328 goto error3; 4329 4330 count++; 4331 } 4332 4333 if (!count) 4334 goto free; 4335 4336 ib_set_client_data(ib_device, &cm_client, cm_dev); 4337 4338 write_lock_irqsave(&cm.device_lock, flags); 4339 list_add_tail(&cm_dev->list, &cm.device_list); 4340 write_unlock_irqrestore(&cm.device_lock, flags); 4341 return; 4342 4343 error3: 4344 ib_unregister_mad_agent(port->mad_agent); 4345 error2: 4346 cm_remove_port_fs(port); 4347 error1: 4348 port_modify.set_port_cap_mask = 0; 4349 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 4350 kfree(port); 4351 while (--i) { 4352 if (!rdma_cap_ib_cm(ib_device, i)) 4353 continue; 4354 4355 port = cm_dev->port[i-1]; 4356 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4357 ib_unregister_mad_agent(port->mad_agent); 4358 cm_remove_port_fs(port); 4359 kfree(port); 4360 } 4361 free: 4362 kfree(cm_dev); 4363 } 4364 4365 static void cm_remove_one(struct ib_device *ib_device, void *client_data) 4366 { 4367 struct cm_device *cm_dev = client_data; 4368 struct cm_port *port; 4369 struct cm_id_private *cm_id_priv; 4370 struct ib_mad_agent *cur_mad_agent; 4371 struct ib_port_modify port_modify = { 4372 .clr_port_cap_mask = IB_PORT_CM_SUP 4373 }; 4374 unsigned long flags __writeonly; 4375 int i; 4376 4377 if (!cm_dev) 4378 return; 4379 4380 write_lock_irqsave(&cm.device_lock, flags); 4381 list_del(&cm_dev->list); 4382 write_unlock_irqrestore(&cm.device_lock, flags); 4383 4384 spin_lock_irq(&cm.lock); 4385 cm_dev->going_down = 1; 4386 spin_unlock_irq(&cm.lock); 4387 4388 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 4389 if (!rdma_cap_ib_cm(ib_device, i)) 4390 continue; 4391 4392 port = cm_dev->port[i-1]; 4393 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4394 /* Mark all the cm_id's as not valid */ 4395 spin_lock_irq(&cm.lock); 4396 list_for_each_entry(cm_id_priv, &port->cm_priv_altr_list, altr_list) 4397 cm_id_priv->altr_send_port_not_ready = 1; 4398 list_for_each_entry(cm_id_priv, &port->cm_priv_prim_list, prim_list) 4399 cm_id_priv->prim_send_port_not_ready = 1; 4400 spin_unlock_irq(&cm.lock); 4401 /* 4402 * We flush the queue here after the going_down set, this 4403 * verify that no new works will be queued in the recv handler, 4404 * after that we can call the unregister_mad_agent 4405 */ 4406 flush_workqueue(cm.wq); 4407 spin_lock_irq(&cm.state_lock); 4408 cur_mad_agent = port->mad_agent; 4409 port->mad_agent = NULL; 4410 spin_unlock_irq(&cm.state_lock); 4411 ib_unregister_mad_agent(cur_mad_agent); 4412 cm_remove_port_fs(port); 4413 kfree(port); 4414 } 4415 4416 kfree(cm_dev); 4417 } 4418 4419 static int __init ib_cm_init(void) 4420 { 4421 int ret; 4422 4423 memset(&cm, 0, sizeof cm); 4424 INIT_LIST_HEAD(&cm.device_list); 4425 rwlock_init(&cm.device_lock); 4426 spin_lock_init(&cm.lock); 4427 spin_lock_init(&cm.state_lock); 4428 cm.listen_service_table = RB_ROOT; 4429 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 4430 cm.remote_id_table = RB_ROOT; 4431 cm.remote_qp_table = RB_ROOT; 4432 cm.remote_sidr_table = RB_ROOT; 4433 idr_init(&cm.local_id_table); 4434 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 4435 INIT_LIST_HEAD(&cm.timewait_list); 4436 4437 ret = class_register(&cm_class); 4438 if (ret) { 4439 ret = -ENOMEM; 4440 goto error1; 4441 } 4442 4443 cm.wq = create_workqueue("ib_cm"); 4444 if (!cm.wq) { 4445 ret = -ENOMEM; 4446 goto error2; 4447 } 4448 4449 ret = ib_register_client(&cm_client); 4450 if (ret) 4451 goto error3; 4452 4453 return 0; 4454 error3: 4455 destroy_workqueue(cm.wq); 4456 error2: 4457 class_unregister(&cm_class); 4458 error1: 4459 idr_destroy(&cm.local_id_table); 4460 return ret; 4461 } 4462 4463 static void __exit ib_cm_cleanup(void) 4464 { 4465 struct cm_timewait_info *timewait_info, *tmp; 4466 4467 spin_lock_irq(&cm.lock); 4468 list_for_each_entry(timewait_info, &cm.timewait_list, list) 4469 cancel_delayed_work(&timewait_info->work.work); 4470 spin_unlock_irq(&cm.lock); 4471 4472 ib_unregister_client(&cm_client); 4473 destroy_workqueue(cm.wq); 4474 4475 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 4476 cancel_delayed_work_sync(&timewait_info->work.work); 4477 list_del(&timewait_info->list); 4478 kfree(timewait_info); 4479 } 4480 4481 class_unregister(&cm_class); 4482 idr_destroy(&cm.local_id_table); 4483 } 4484 4485 module_init_order(ib_cm_init, SI_ORDER_SECOND); 4486 module_exit_order(ib_cm_cleanup, SI_ORDER_SECOND); 4487 4488