1 /* 2 * Copyright (c) 2005 Voltaire Inc. All rights reserved. 3 * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved. 4 * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved. 5 * Copyright (c) 2005-2006 Intel Corporation. All rights reserved. 6 * 7 * This software is available to you under a choice of one of two 8 * licenses. You may choose to be licensed under the terms of the GNU 9 * General Public License (GPL) Version 2, available from the file 10 * COPYING in the main directory of this source tree, or the 11 * OpenIB.org BSD license below: 12 * 13 * Redistribution and use in source and binary forms, with or 14 * without modification, are permitted provided that the following 15 * conditions are met: 16 * 17 * - Redistributions of source code must retain the above 18 * copyright notice, this list of conditions and the following 19 * disclaimer. 20 * 21 * - Redistributions in binary form must reproduce the above 22 * copyright notice, this list of conditions and the following 23 * disclaimer in the documentation and/or other materials 24 * provided with the distribution. 25 * 26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 33 * SOFTWARE. 34 */ 35 36 #include <linux/completion.h> 37 #include <linux/in.h> 38 #include <linux/in6.h> 39 #include <linux/mutex.h> 40 #include <linux/random.h> 41 #include <linux/idr.h> 42 #include <linux/inetdevice.h> 43 44 #include <net/tcp.h> 45 #include <net/ipv6.h> 46 47 #include <rdma/rdma_cm.h> 48 #include <rdma/rdma_cm_ib.h> 49 #include <rdma/ib_cache.h> 50 #include <rdma/ib_cm.h> 51 #include <rdma/ib_sa.h> 52 #include <rdma/iw_cm.h> 53 54 MODULE_AUTHOR("Sean Hefty"); 55 MODULE_DESCRIPTION("Generic RDMA CM Agent"); 56 MODULE_LICENSE("Dual BSD/GPL"); 57 58 #define CMA_CM_RESPONSE_TIMEOUT 20 59 #define CMA_MAX_CM_RETRIES 15 60 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24) 61 62 static void cma_add_one(struct ib_device *device); 63 static void cma_remove_one(struct ib_device *device); 64 65 static struct ib_client cma_client = { 66 .name = "cma", 67 .add = cma_add_one, 68 .remove = cma_remove_one 69 }; 70 71 static struct ib_sa_client sa_client; 72 static struct rdma_addr_client addr_client; 73 static LIST_HEAD(dev_list); 74 static LIST_HEAD(listen_any_list); 75 static DEFINE_MUTEX(lock); 76 static struct workqueue_struct *cma_wq; 77 static DEFINE_IDR(sdp_ps); 78 static DEFINE_IDR(tcp_ps); 79 static DEFINE_IDR(udp_ps); 80 static DEFINE_IDR(ipoib_ps); 81 static int next_port; 82 83 struct cma_device { 84 struct list_head list; 85 struct ib_device *device; 86 struct completion comp; 87 atomic_t refcount; 88 struct list_head id_list; 89 }; 90 91 enum cma_state { 92 CMA_IDLE, 93 CMA_ADDR_QUERY, 94 CMA_ADDR_RESOLVED, 95 CMA_ROUTE_QUERY, 96 CMA_ROUTE_RESOLVED, 97 CMA_CONNECT, 98 CMA_DISCONNECT, 99 CMA_ADDR_BOUND, 100 CMA_LISTEN, 101 CMA_DEVICE_REMOVAL, 102 CMA_DESTROYING 103 }; 104 105 struct rdma_bind_list { 106 struct idr *ps; 107 struct hlist_head owners; 108 unsigned short port; 109 }; 110 111 /* 112 * Device removal can occur at anytime, so we need extra handling to 113 * serialize notifying the user of device removal with other callbacks. 114 * We do this by disabling removal notification while a callback is in process, 115 * and reporting it after the callback completes. 116 */ 117 struct rdma_id_private { 118 struct rdma_cm_id id; 119 120 struct rdma_bind_list *bind_list; 121 struct hlist_node node; 122 struct list_head list; /* listen_any_list or cma_device.list */ 123 struct list_head listen_list; /* per device listens */ 124 struct cma_device *cma_dev; 125 struct list_head mc_list; 126 127 int internal_id; 128 enum cma_state state; 129 spinlock_t lock; 130 struct mutex qp_mutex; 131 132 struct completion comp; 133 atomic_t refcount; 134 struct mutex handler_mutex; 135 136 int backlog; 137 int timeout_ms; 138 struct ib_sa_query *query; 139 int query_id; 140 union { 141 struct ib_cm_id *ib; 142 struct iw_cm_id *iw; 143 } cm_id; 144 145 u32 seq_num; 146 u32 qkey; 147 u32 qp_num; 148 u8 srq; 149 u8 tos; 150 }; 151 152 struct cma_multicast { 153 struct rdma_id_private *id_priv; 154 union { 155 struct ib_sa_multicast *ib; 156 } multicast; 157 struct list_head list; 158 void *context; 159 struct sockaddr_storage addr; 160 }; 161 162 struct cma_work { 163 struct work_struct work; 164 struct rdma_id_private *id; 165 enum cma_state old_state; 166 enum cma_state new_state; 167 struct rdma_cm_event event; 168 }; 169 170 struct cma_ndev_work { 171 struct work_struct work; 172 struct rdma_id_private *id; 173 struct rdma_cm_event event; 174 }; 175 176 union cma_ip_addr { 177 struct in6_addr ip6; 178 struct { 179 __be32 pad[3]; 180 __be32 addr; 181 } ip4; 182 }; 183 184 struct cma_hdr { 185 u8 cma_version; 186 u8 ip_version; /* IP version: 7:4 */ 187 __be16 port; 188 union cma_ip_addr src_addr; 189 union cma_ip_addr dst_addr; 190 }; 191 192 struct sdp_hh { 193 u8 bsdh[16]; 194 u8 sdp_version; /* Major version: 7:4 */ 195 u8 ip_version; /* IP version: 7:4 */ 196 u8 sdp_specific1[10]; 197 __be16 port; 198 __be16 sdp_specific2; 199 union cma_ip_addr src_addr; 200 union cma_ip_addr dst_addr; 201 }; 202 203 struct sdp_hah { 204 u8 bsdh[16]; 205 u8 sdp_version; 206 }; 207 208 #define CMA_VERSION 0x00 209 #define SDP_MAJ_VERSION 0x2 210 211 static int cma_comp(struct rdma_id_private *id_priv, enum cma_state comp) 212 { 213 unsigned long flags; 214 int ret; 215 216 spin_lock_irqsave(&id_priv->lock, flags); 217 ret = (id_priv->state == comp); 218 spin_unlock_irqrestore(&id_priv->lock, flags); 219 return ret; 220 } 221 222 static int cma_comp_exch(struct rdma_id_private *id_priv, 223 enum cma_state comp, enum cma_state exch) 224 { 225 unsigned long flags; 226 int ret; 227 228 spin_lock_irqsave(&id_priv->lock, flags); 229 if ((ret = (id_priv->state == comp))) 230 id_priv->state = exch; 231 spin_unlock_irqrestore(&id_priv->lock, flags); 232 return ret; 233 } 234 235 static enum cma_state cma_exch(struct rdma_id_private *id_priv, 236 enum cma_state exch) 237 { 238 unsigned long flags; 239 enum cma_state old; 240 241 spin_lock_irqsave(&id_priv->lock, flags); 242 old = id_priv->state; 243 id_priv->state = exch; 244 spin_unlock_irqrestore(&id_priv->lock, flags); 245 return old; 246 } 247 248 static inline u8 cma_get_ip_ver(struct cma_hdr *hdr) 249 { 250 return hdr->ip_version >> 4; 251 } 252 253 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver) 254 { 255 hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF); 256 } 257 258 static inline u8 sdp_get_majv(u8 sdp_version) 259 { 260 return sdp_version >> 4; 261 } 262 263 static inline u8 sdp_get_ip_ver(struct sdp_hh *hh) 264 { 265 return hh->ip_version >> 4; 266 } 267 268 static inline void sdp_set_ip_ver(struct sdp_hh *hh, u8 ip_ver) 269 { 270 hh->ip_version = (ip_ver << 4) | (hh->ip_version & 0xF); 271 } 272 273 static inline int cma_is_ud_ps(enum rdma_port_space ps) 274 { 275 return (ps == RDMA_PS_UDP || ps == RDMA_PS_IPOIB); 276 } 277 278 static void cma_attach_to_dev(struct rdma_id_private *id_priv, 279 struct cma_device *cma_dev) 280 { 281 atomic_inc(&cma_dev->refcount); 282 id_priv->cma_dev = cma_dev; 283 id_priv->id.device = cma_dev->device; 284 list_add_tail(&id_priv->list, &cma_dev->id_list); 285 } 286 287 static inline void cma_deref_dev(struct cma_device *cma_dev) 288 { 289 if (atomic_dec_and_test(&cma_dev->refcount)) 290 complete(&cma_dev->comp); 291 } 292 293 static void cma_detach_from_dev(struct rdma_id_private *id_priv) 294 { 295 list_del(&id_priv->list); 296 cma_deref_dev(id_priv->cma_dev); 297 id_priv->cma_dev = NULL; 298 } 299 300 static int cma_set_qkey(struct rdma_id_private *id_priv) 301 { 302 struct ib_sa_mcmember_rec rec; 303 int ret = 0; 304 305 if (id_priv->qkey) 306 return 0; 307 308 switch (id_priv->id.ps) { 309 case RDMA_PS_UDP: 310 id_priv->qkey = RDMA_UDP_QKEY; 311 break; 312 case RDMA_PS_IPOIB: 313 ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid); 314 ret = ib_sa_get_mcmember_rec(id_priv->id.device, 315 id_priv->id.port_num, &rec.mgid, 316 &rec); 317 if (!ret) 318 id_priv->qkey = be32_to_cpu(rec.qkey); 319 break; 320 default: 321 break; 322 } 323 return ret; 324 } 325 326 static int cma_acquire_dev(struct rdma_id_private *id_priv) 327 { 328 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr; 329 struct cma_device *cma_dev; 330 union ib_gid gid; 331 int ret = -ENODEV; 332 333 switch (rdma_node_get_transport(dev_addr->dev_type)) { 334 case RDMA_TRANSPORT_IB: 335 ib_addr_get_sgid(dev_addr, &gid); 336 break; 337 case RDMA_TRANSPORT_IWARP: 338 iw_addr_get_sgid(dev_addr, &gid); 339 break; 340 default: 341 return -ENODEV; 342 } 343 344 list_for_each_entry(cma_dev, &dev_list, list) { 345 ret = ib_find_cached_gid(cma_dev->device, &gid, 346 &id_priv->id.port_num, NULL); 347 if (!ret) { 348 cma_attach_to_dev(id_priv, cma_dev); 349 break; 350 } 351 } 352 return ret; 353 } 354 355 static void cma_deref_id(struct rdma_id_private *id_priv) 356 { 357 if (atomic_dec_and_test(&id_priv->refcount)) 358 complete(&id_priv->comp); 359 } 360 361 static int cma_disable_callback(struct rdma_id_private *id_priv, 362 enum cma_state state) 363 { 364 mutex_lock(&id_priv->handler_mutex); 365 if (id_priv->state != state) { 366 mutex_unlock(&id_priv->handler_mutex); 367 return -EINVAL; 368 } 369 return 0; 370 } 371 372 static int cma_has_cm_dev(struct rdma_id_private *id_priv) 373 { 374 return (id_priv->id.device && id_priv->cm_id.ib); 375 } 376 377 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler, 378 void *context, enum rdma_port_space ps) 379 { 380 struct rdma_id_private *id_priv; 381 382 id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL); 383 if (!id_priv) 384 return ERR_PTR(-ENOMEM); 385 386 id_priv->state = CMA_IDLE; 387 id_priv->id.context = context; 388 id_priv->id.event_handler = event_handler; 389 id_priv->id.ps = ps; 390 spin_lock_init(&id_priv->lock); 391 mutex_init(&id_priv->qp_mutex); 392 init_completion(&id_priv->comp); 393 atomic_set(&id_priv->refcount, 1); 394 mutex_init(&id_priv->handler_mutex); 395 INIT_LIST_HEAD(&id_priv->listen_list); 396 INIT_LIST_HEAD(&id_priv->mc_list); 397 get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num); 398 399 return &id_priv->id; 400 } 401 EXPORT_SYMBOL(rdma_create_id); 402 403 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp) 404 { 405 struct ib_qp_attr qp_attr; 406 int qp_attr_mask, ret; 407 408 qp_attr.qp_state = IB_QPS_INIT; 409 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask); 410 if (ret) 411 return ret; 412 413 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 414 if (ret) 415 return ret; 416 417 qp_attr.qp_state = IB_QPS_RTR; 418 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE); 419 if (ret) 420 return ret; 421 422 qp_attr.qp_state = IB_QPS_RTS; 423 qp_attr.sq_psn = 0; 424 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN); 425 426 return ret; 427 } 428 429 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp) 430 { 431 struct ib_qp_attr qp_attr; 432 int qp_attr_mask, ret; 433 434 qp_attr.qp_state = IB_QPS_INIT; 435 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask); 436 if (ret) 437 return ret; 438 439 return ib_modify_qp(qp, &qp_attr, qp_attr_mask); 440 } 441 442 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd, 443 struct ib_qp_init_attr *qp_init_attr) 444 { 445 struct rdma_id_private *id_priv; 446 struct ib_qp *qp; 447 int ret; 448 449 id_priv = container_of(id, struct rdma_id_private, id); 450 if (id->device != pd->device) 451 return -EINVAL; 452 453 qp = ib_create_qp(pd, qp_init_attr); 454 if (IS_ERR(qp)) 455 return PTR_ERR(qp); 456 457 if (cma_is_ud_ps(id_priv->id.ps)) 458 ret = cma_init_ud_qp(id_priv, qp); 459 else 460 ret = cma_init_conn_qp(id_priv, qp); 461 if (ret) 462 goto err; 463 464 id->qp = qp; 465 id_priv->qp_num = qp->qp_num; 466 id_priv->srq = (qp->srq != NULL); 467 return 0; 468 err: 469 ib_destroy_qp(qp); 470 return ret; 471 } 472 EXPORT_SYMBOL(rdma_create_qp); 473 474 void rdma_destroy_qp(struct rdma_cm_id *id) 475 { 476 struct rdma_id_private *id_priv; 477 478 id_priv = container_of(id, struct rdma_id_private, id); 479 mutex_lock(&id_priv->qp_mutex); 480 ib_destroy_qp(id_priv->id.qp); 481 id_priv->id.qp = NULL; 482 mutex_unlock(&id_priv->qp_mutex); 483 } 484 EXPORT_SYMBOL(rdma_destroy_qp); 485 486 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv, 487 struct rdma_conn_param *conn_param) 488 { 489 struct ib_qp_attr qp_attr; 490 int qp_attr_mask, ret; 491 492 mutex_lock(&id_priv->qp_mutex); 493 if (!id_priv->id.qp) { 494 ret = 0; 495 goto out; 496 } 497 498 /* Need to update QP attributes from default values. */ 499 qp_attr.qp_state = IB_QPS_INIT; 500 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask); 501 if (ret) 502 goto out; 503 504 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask); 505 if (ret) 506 goto out; 507 508 qp_attr.qp_state = IB_QPS_RTR; 509 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask); 510 if (ret) 511 goto out; 512 513 if (conn_param) 514 qp_attr.max_dest_rd_atomic = conn_param->responder_resources; 515 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask); 516 out: 517 mutex_unlock(&id_priv->qp_mutex); 518 return ret; 519 } 520 521 static int cma_modify_qp_rts(struct rdma_id_private *id_priv, 522 struct rdma_conn_param *conn_param) 523 { 524 struct ib_qp_attr qp_attr; 525 int qp_attr_mask, ret; 526 527 mutex_lock(&id_priv->qp_mutex); 528 if (!id_priv->id.qp) { 529 ret = 0; 530 goto out; 531 } 532 533 qp_attr.qp_state = IB_QPS_RTS; 534 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask); 535 if (ret) 536 goto out; 537 538 if (conn_param) 539 qp_attr.max_rd_atomic = conn_param->initiator_depth; 540 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask); 541 out: 542 mutex_unlock(&id_priv->qp_mutex); 543 return ret; 544 } 545 546 static int cma_modify_qp_err(struct rdma_id_private *id_priv) 547 { 548 struct ib_qp_attr qp_attr; 549 int ret; 550 551 mutex_lock(&id_priv->qp_mutex); 552 if (!id_priv->id.qp) { 553 ret = 0; 554 goto out; 555 } 556 557 qp_attr.qp_state = IB_QPS_ERR; 558 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE); 559 out: 560 mutex_unlock(&id_priv->qp_mutex); 561 return ret; 562 } 563 564 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv, 565 struct ib_qp_attr *qp_attr, int *qp_attr_mask) 566 { 567 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr; 568 int ret; 569 570 ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num, 571 ib_addr_get_pkey(dev_addr), 572 &qp_attr->pkey_index); 573 if (ret) 574 return ret; 575 576 qp_attr->port_num = id_priv->id.port_num; 577 *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT; 578 579 if (cma_is_ud_ps(id_priv->id.ps)) { 580 ret = cma_set_qkey(id_priv); 581 if (ret) 582 return ret; 583 584 qp_attr->qkey = id_priv->qkey; 585 *qp_attr_mask |= IB_QP_QKEY; 586 } else { 587 qp_attr->qp_access_flags = 0; 588 *qp_attr_mask |= IB_QP_ACCESS_FLAGS; 589 } 590 return 0; 591 } 592 593 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr, 594 int *qp_attr_mask) 595 { 596 struct rdma_id_private *id_priv; 597 int ret = 0; 598 599 id_priv = container_of(id, struct rdma_id_private, id); 600 switch (rdma_node_get_transport(id_priv->id.device->node_type)) { 601 case RDMA_TRANSPORT_IB: 602 if (!id_priv->cm_id.ib || cma_is_ud_ps(id_priv->id.ps)) 603 ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask); 604 else 605 ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr, 606 qp_attr_mask); 607 if (qp_attr->qp_state == IB_QPS_RTR) 608 qp_attr->rq_psn = id_priv->seq_num; 609 break; 610 case RDMA_TRANSPORT_IWARP: 611 if (!id_priv->cm_id.iw) { 612 qp_attr->qp_access_flags = 0; 613 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS; 614 } else 615 ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr, 616 qp_attr_mask); 617 break; 618 default: 619 ret = -ENOSYS; 620 break; 621 } 622 623 return ret; 624 } 625 EXPORT_SYMBOL(rdma_init_qp_attr); 626 627 static inline int cma_zero_addr(struct sockaddr *addr) 628 { 629 struct in6_addr *ip6; 630 631 if (addr->sa_family == AF_INET) 632 return ipv4_is_zeronet( 633 ((struct sockaddr_in *)addr)->sin_addr.s_addr); 634 else { 635 ip6 = &((struct sockaddr_in6 *) addr)->sin6_addr; 636 return (ip6->s6_addr32[0] | ip6->s6_addr32[1] | 637 ip6->s6_addr32[2] | ip6->s6_addr32[3]) == 0; 638 } 639 } 640 641 static inline int cma_loopback_addr(struct sockaddr *addr) 642 { 643 if (addr->sa_family == AF_INET) 644 return ipv4_is_loopback( 645 ((struct sockaddr_in *) addr)->sin_addr.s_addr); 646 else 647 return ipv6_addr_loopback( 648 &((struct sockaddr_in6 *) addr)->sin6_addr); 649 } 650 651 static inline int cma_any_addr(struct sockaddr *addr) 652 { 653 return cma_zero_addr(addr) || cma_loopback_addr(addr); 654 } 655 656 static inline __be16 cma_port(struct sockaddr *addr) 657 { 658 if (addr->sa_family == AF_INET) 659 return ((struct sockaddr_in *) addr)->sin_port; 660 else 661 return ((struct sockaddr_in6 *) addr)->sin6_port; 662 } 663 664 static inline int cma_any_port(struct sockaddr *addr) 665 { 666 return !cma_port(addr); 667 } 668 669 static int cma_get_net_info(void *hdr, enum rdma_port_space ps, 670 u8 *ip_ver, __be16 *port, 671 union cma_ip_addr **src, union cma_ip_addr **dst) 672 { 673 switch (ps) { 674 case RDMA_PS_SDP: 675 if (sdp_get_majv(((struct sdp_hh *) hdr)->sdp_version) != 676 SDP_MAJ_VERSION) 677 return -EINVAL; 678 679 *ip_ver = sdp_get_ip_ver(hdr); 680 *port = ((struct sdp_hh *) hdr)->port; 681 *src = &((struct sdp_hh *) hdr)->src_addr; 682 *dst = &((struct sdp_hh *) hdr)->dst_addr; 683 break; 684 default: 685 if (((struct cma_hdr *) hdr)->cma_version != CMA_VERSION) 686 return -EINVAL; 687 688 *ip_ver = cma_get_ip_ver(hdr); 689 *port = ((struct cma_hdr *) hdr)->port; 690 *src = &((struct cma_hdr *) hdr)->src_addr; 691 *dst = &((struct cma_hdr *) hdr)->dst_addr; 692 break; 693 } 694 695 if (*ip_ver != 4 && *ip_ver != 6) 696 return -EINVAL; 697 return 0; 698 } 699 700 static void cma_save_net_info(struct rdma_addr *addr, 701 struct rdma_addr *listen_addr, 702 u8 ip_ver, __be16 port, 703 union cma_ip_addr *src, union cma_ip_addr *dst) 704 { 705 struct sockaddr_in *listen4, *ip4; 706 struct sockaddr_in6 *listen6, *ip6; 707 708 switch (ip_ver) { 709 case 4: 710 listen4 = (struct sockaddr_in *) &listen_addr->src_addr; 711 ip4 = (struct sockaddr_in *) &addr->src_addr; 712 ip4->sin_family = listen4->sin_family; 713 ip4->sin_addr.s_addr = dst->ip4.addr; 714 ip4->sin_port = listen4->sin_port; 715 716 ip4 = (struct sockaddr_in *) &addr->dst_addr; 717 ip4->sin_family = listen4->sin_family; 718 ip4->sin_addr.s_addr = src->ip4.addr; 719 ip4->sin_port = port; 720 break; 721 case 6: 722 listen6 = (struct sockaddr_in6 *) &listen_addr->src_addr; 723 ip6 = (struct sockaddr_in6 *) &addr->src_addr; 724 ip6->sin6_family = listen6->sin6_family; 725 ip6->sin6_addr = dst->ip6; 726 ip6->sin6_port = listen6->sin6_port; 727 728 ip6 = (struct sockaddr_in6 *) &addr->dst_addr; 729 ip6->sin6_family = listen6->sin6_family; 730 ip6->sin6_addr = src->ip6; 731 ip6->sin6_port = port; 732 break; 733 default: 734 break; 735 } 736 } 737 738 static inline int cma_user_data_offset(enum rdma_port_space ps) 739 { 740 switch (ps) { 741 case RDMA_PS_SDP: 742 return 0; 743 default: 744 return sizeof(struct cma_hdr); 745 } 746 } 747 748 static void cma_cancel_route(struct rdma_id_private *id_priv) 749 { 750 switch (rdma_node_get_transport(id_priv->id.device->node_type)) { 751 case RDMA_TRANSPORT_IB: 752 if (id_priv->query) 753 ib_sa_cancel_query(id_priv->query_id, id_priv->query); 754 break; 755 default: 756 break; 757 } 758 } 759 760 static void cma_cancel_listens(struct rdma_id_private *id_priv) 761 { 762 struct rdma_id_private *dev_id_priv; 763 764 /* 765 * Remove from listen_any_list to prevent added devices from spawning 766 * additional listen requests. 767 */ 768 mutex_lock(&lock); 769 list_del(&id_priv->list); 770 771 while (!list_empty(&id_priv->listen_list)) { 772 dev_id_priv = list_entry(id_priv->listen_list.next, 773 struct rdma_id_private, listen_list); 774 /* sync with device removal to avoid duplicate destruction */ 775 list_del_init(&dev_id_priv->list); 776 list_del(&dev_id_priv->listen_list); 777 mutex_unlock(&lock); 778 779 rdma_destroy_id(&dev_id_priv->id); 780 mutex_lock(&lock); 781 } 782 mutex_unlock(&lock); 783 } 784 785 static void cma_cancel_operation(struct rdma_id_private *id_priv, 786 enum cma_state state) 787 { 788 switch (state) { 789 case CMA_ADDR_QUERY: 790 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr); 791 break; 792 case CMA_ROUTE_QUERY: 793 cma_cancel_route(id_priv); 794 break; 795 case CMA_LISTEN: 796 if (cma_any_addr((struct sockaddr *) &id_priv->id.route.addr.src_addr) 797 && !id_priv->cma_dev) 798 cma_cancel_listens(id_priv); 799 break; 800 default: 801 break; 802 } 803 } 804 805 static void cma_release_port(struct rdma_id_private *id_priv) 806 { 807 struct rdma_bind_list *bind_list = id_priv->bind_list; 808 809 if (!bind_list) 810 return; 811 812 mutex_lock(&lock); 813 hlist_del(&id_priv->node); 814 if (hlist_empty(&bind_list->owners)) { 815 idr_remove(bind_list->ps, bind_list->port); 816 kfree(bind_list); 817 } 818 mutex_unlock(&lock); 819 } 820 821 static void cma_leave_mc_groups(struct rdma_id_private *id_priv) 822 { 823 struct cma_multicast *mc; 824 825 while (!list_empty(&id_priv->mc_list)) { 826 mc = container_of(id_priv->mc_list.next, 827 struct cma_multicast, list); 828 list_del(&mc->list); 829 ib_sa_free_multicast(mc->multicast.ib); 830 kfree(mc); 831 } 832 } 833 834 void rdma_destroy_id(struct rdma_cm_id *id) 835 { 836 struct rdma_id_private *id_priv; 837 enum cma_state state; 838 839 id_priv = container_of(id, struct rdma_id_private, id); 840 state = cma_exch(id_priv, CMA_DESTROYING); 841 cma_cancel_operation(id_priv, state); 842 843 mutex_lock(&lock); 844 if (id_priv->cma_dev) { 845 mutex_unlock(&lock); 846 switch (rdma_node_get_transport(id->device->node_type)) { 847 case RDMA_TRANSPORT_IB: 848 if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib)) 849 ib_destroy_cm_id(id_priv->cm_id.ib); 850 break; 851 case RDMA_TRANSPORT_IWARP: 852 if (id_priv->cm_id.iw && !IS_ERR(id_priv->cm_id.iw)) 853 iw_destroy_cm_id(id_priv->cm_id.iw); 854 break; 855 default: 856 break; 857 } 858 cma_leave_mc_groups(id_priv); 859 mutex_lock(&lock); 860 cma_detach_from_dev(id_priv); 861 } 862 mutex_unlock(&lock); 863 864 cma_release_port(id_priv); 865 cma_deref_id(id_priv); 866 wait_for_completion(&id_priv->comp); 867 868 if (id_priv->internal_id) 869 cma_deref_id(id_priv->id.context); 870 871 kfree(id_priv->id.route.path_rec); 872 kfree(id_priv); 873 } 874 EXPORT_SYMBOL(rdma_destroy_id); 875 876 static int cma_rep_recv(struct rdma_id_private *id_priv) 877 { 878 int ret; 879 880 ret = cma_modify_qp_rtr(id_priv, NULL); 881 if (ret) 882 goto reject; 883 884 ret = cma_modify_qp_rts(id_priv, NULL); 885 if (ret) 886 goto reject; 887 888 ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0); 889 if (ret) 890 goto reject; 891 892 return 0; 893 reject: 894 cma_modify_qp_err(id_priv); 895 ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED, 896 NULL, 0, NULL, 0); 897 return ret; 898 } 899 900 static int cma_verify_rep(struct rdma_id_private *id_priv, void *data) 901 { 902 if (id_priv->id.ps == RDMA_PS_SDP && 903 sdp_get_majv(((struct sdp_hah *) data)->sdp_version) != 904 SDP_MAJ_VERSION) 905 return -EINVAL; 906 907 return 0; 908 } 909 910 static void cma_set_rep_event_data(struct rdma_cm_event *event, 911 struct ib_cm_rep_event_param *rep_data, 912 void *private_data) 913 { 914 event->param.conn.private_data = private_data; 915 event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE; 916 event->param.conn.responder_resources = rep_data->responder_resources; 917 event->param.conn.initiator_depth = rep_data->initiator_depth; 918 event->param.conn.flow_control = rep_data->flow_control; 919 event->param.conn.rnr_retry_count = rep_data->rnr_retry_count; 920 event->param.conn.srq = rep_data->srq; 921 event->param.conn.qp_num = rep_data->remote_qpn; 922 } 923 924 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event) 925 { 926 struct rdma_id_private *id_priv = cm_id->context; 927 struct rdma_cm_event event; 928 int ret = 0; 929 930 if ((ib_event->event != IB_CM_TIMEWAIT_EXIT && 931 cma_disable_callback(id_priv, CMA_CONNECT)) || 932 (ib_event->event == IB_CM_TIMEWAIT_EXIT && 933 cma_disable_callback(id_priv, CMA_DISCONNECT))) 934 return 0; 935 936 memset(&event, 0, sizeof event); 937 switch (ib_event->event) { 938 case IB_CM_REQ_ERROR: 939 case IB_CM_REP_ERROR: 940 event.event = RDMA_CM_EVENT_UNREACHABLE; 941 event.status = -ETIMEDOUT; 942 break; 943 case IB_CM_REP_RECEIVED: 944 event.status = cma_verify_rep(id_priv, ib_event->private_data); 945 if (event.status) 946 event.event = RDMA_CM_EVENT_CONNECT_ERROR; 947 else if (id_priv->id.qp && id_priv->id.ps != RDMA_PS_SDP) { 948 event.status = cma_rep_recv(id_priv); 949 event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR : 950 RDMA_CM_EVENT_ESTABLISHED; 951 } else 952 event.event = RDMA_CM_EVENT_CONNECT_RESPONSE; 953 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd, 954 ib_event->private_data); 955 break; 956 case IB_CM_RTU_RECEIVED: 957 case IB_CM_USER_ESTABLISHED: 958 event.event = RDMA_CM_EVENT_ESTABLISHED; 959 break; 960 case IB_CM_DREQ_ERROR: 961 event.status = -ETIMEDOUT; /* fall through */ 962 case IB_CM_DREQ_RECEIVED: 963 case IB_CM_DREP_RECEIVED: 964 if (!cma_comp_exch(id_priv, CMA_CONNECT, CMA_DISCONNECT)) 965 goto out; 966 event.event = RDMA_CM_EVENT_DISCONNECTED; 967 break; 968 case IB_CM_TIMEWAIT_EXIT: 969 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT; 970 break; 971 case IB_CM_MRA_RECEIVED: 972 /* ignore event */ 973 goto out; 974 case IB_CM_REJ_RECEIVED: 975 cma_modify_qp_err(id_priv); 976 event.status = ib_event->param.rej_rcvd.reason; 977 event.event = RDMA_CM_EVENT_REJECTED; 978 event.param.conn.private_data = ib_event->private_data; 979 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE; 980 break; 981 default: 982 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n", 983 ib_event->event); 984 goto out; 985 } 986 987 ret = id_priv->id.event_handler(&id_priv->id, &event); 988 if (ret) { 989 /* Destroy the CM ID by returning a non-zero value. */ 990 id_priv->cm_id.ib = NULL; 991 cma_exch(id_priv, CMA_DESTROYING); 992 mutex_unlock(&id_priv->handler_mutex); 993 rdma_destroy_id(&id_priv->id); 994 return ret; 995 } 996 out: 997 mutex_unlock(&id_priv->handler_mutex); 998 return ret; 999 } 1000 1001 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id, 1002 struct ib_cm_event *ib_event) 1003 { 1004 struct rdma_id_private *id_priv; 1005 struct rdma_cm_id *id; 1006 struct rdma_route *rt; 1007 union cma_ip_addr *src, *dst; 1008 __be16 port; 1009 u8 ip_ver; 1010 int ret; 1011 1012 if (cma_get_net_info(ib_event->private_data, listen_id->ps, 1013 &ip_ver, &port, &src, &dst)) 1014 goto err; 1015 1016 id = rdma_create_id(listen_id->event_handler, listen_id->context, 1017 listen_id->ps); 1018 if (IS_ERR(id)) 1019 goto err; 1020 1021 cma_save_net_info(&id->route.addr, &listen_id->route.addr, 1022 ip_ver, port, src, dst); 1023 1024 rt = &id->route; 1025 rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1; 1026 rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths, 1027 GFP_KERNEL); 1028 if (!rt->path_rec) 1029 goto destroy_id; 1030 1031 rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path; 1032 if (rt->num_paths == 2) 1033 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path; 1034 1035 ib_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid); 1036 ret = rdma_translate_ip((struct sockaddr *) &id->route.addr.src_addr, 1037 &id->route.addr.dev_addr); 1038 if (ret) 1039 goto destroy_id; 1040 1041 id_priv = container_of(id, struct rdma_id_private, id); 1042 id_priv->state = CMA_CONNECT; 1043 return id_priv; 1044 1045 destroy_id: 1046 rdma_destroy_id(id); 1047 err: 1048 return NULL; 1049 } 1050 1051 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id, 1052 struct ib_cm_event *ib_event) 1053 { 1054 struct rdma_id_private *id_priv; 1055 struct rdma_cm_id *id; 1056 union cma_ip_addr *src, *dst; 1057 __be16 port; 1058 u8 ip_ver; 1059 int ret; 1060 1061 id = rdma_create_id(listen_id->event_handler, listen_id->context, 1062 listen_id->ps); 1063 if (IS_ERR(id)) 1064 return NULL; 1065 1066 1067 if (cma_get_net_info(ib_event->private_data, listen_id->ps, 1068 &ip_ver, &port, &src, &dst)) 1069 goto err; 1070 1071 cma_save_net_info(&id->route.addr, &listen_id->route.addr, 1072 ip_ver, port, src, dst); 1073 1074 ret = rdma_translate_ip((struct sockaddr *) &id->route.addr.src_addr, 1075 &id->route.addr.dev_addr); 1076 if (ret) 1077 goto err; 1078 1079 id_priv = container_of(id, struct rdma_id_private, id); 1080 id_priv->state = CMA_CONNECT; 1081 return id_priv; 1082 err: 1083 rdma_destroy_id(id); 1084 return NULL; 1085 } 1086 1087 static void cma_set_req_event_data(struct rdma_cm_event *event, 1088 struct ib_cm_req_event_param *req_data, 1089 void *private_data, int offset) 1090 { 1091 event->param.conn.private_data = private_data + offset; 1092 event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset; 1093 event->param.conn.responder_resources = req_data->responder_resources; 1094 event->param.conn.initiator_depth = req_data->initiator_depth; 1095 event->param.conn.flow_control = req_data->flow_control; 1096 event->param.conn.retry_count = req_data->retry_count; 1097 event->param.conn.rnr_retry_count = req_data->rnr_retry_count; 1098 event->param.conn.srq = req_data->srq; 1099 event->param.conn.qp_num = req_data->remote_qpn; 1100 } 1101 1102 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event) 1103 { 1104 struct rdma_id_private *listen_id, *conn_id; 1105 struct rdma_cm_event event; 1106 int offset, ret; 1107 1108 listen_id = cm_id->context; 1109 if (cma_disable_callback(listen_id, CMA_LISTEN)) 1110 return -ECONNABORTED; 1111 1112 memset(&event, 0, sizeof event); 1113 offset = cma_user_data_offset(listen_id->id.ps); 1114 event.event = RDMA_CM_EVENT_CONNECT_REQUEST; 1115 if (cma_is_ud_ps(listen_id->id.ps)) { 1116 conn_id = cma_new_udp_id(&listen_id->id, ib_event); 1117 event.param.ud.private_data = ib_event->private_data + offset; 1118 event.param.ud.private_data_len = 1119 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset; 1120 } else { 1121 conn_id = cma_new_conn_id(&listen_id->id, ib_event); 1122 cma_set_req_event_data(&event, &ib_event->param.req_rcvd, 1123 ib_event->private_data, offset); 1124 } 1125 if (!conn_id) { 1126 ret = -ENOMEM; 1127 goto out; 1128 } 1129 1130 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING); 1131 mutex_lock(&lock); 1132 ret = cma_acquire_dev(conn_id); 1133 mutex_unlock(&lock); 1134 if (ret) 1135 goto release_conn_id; 1136 1137 conn_id->cm_id.ib = cm_id; 1138 cm_id->context = conn_id; 1139 cm_id->cm_handler = cma_ib_handler; 1140 1141 ret = conn_id->id.event_handler(&conn_id->id, &event); 1142 if (!ret) { 1143 /* 1144 * Acquire mutex to prevent user executing rdma_destroy_id() 1145 * while we're accessing the cm_id. 1146 */ 1147 mutex_lock(&lock); 1148 if (cma_comp(conn_id, CMA_CONNECT) && 1149 !cma_is_ud_ps(conn_id->id.ps)) 1150 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0); 1151 mutex_unlock(&lock); 1152 mutex_unlock(&conn_id->handler_mutex); 1153 goto out; 1154 } 1155 1156 /* Destroy the CM ID by returning a non-zero value. */ 1157 conn_id->cm_id.ib = NULL; 1158 1159 release_conn_id: 1160 cma_exch(conn_id, CMA_DESTROYING); 1161 mutex_unlock(&conn_id->handler_mutex); 1162 rdma_destroy_id(&conn_id->id); 1163 1164 out: 1165 mutex_unlock(&listen_id->handler_mutex); 1166 return ret; 1167 } 1168 1169 static __be64 cma_get_service_id(enum rdma_port_space ps, struct sockaddr *addr) 1170 { 1171 return cpu_to_be64(((u64)ps << 16) + be16_to_cpu(cma_port(addr))); 1172 } 1173 1174 static void cma_set_compare_data(enum rdma_port_space ps, struct sockaddr *addr, 1175 struct ib_cm_compare_data *compare) 1176 { 1177 struct cma_hdr *cma_data, *cma_mask; 1178 struct sdp_hh *sdp_data, *sdp_mask; 1179 __be32 ip4_addr; 1180 struct in6_addr ip6_addr; 1181 1182 memset(compare, 0, sizeof *compare); 1183 cma_data = (void *) compare->data; 1184 cma_mask = (void *) compare->mask; 1185 sdp_data = (void *) compare->data; 1186 sdp_mask = (void *) compare->mask; 1187 1188 switch (addr->sa_family) { 1189 case AF_INET: 1190 ip4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr; 1191 if (ps == RDMA_PS_SDP) { 1192 sdp_set_ip_ver(sdp_data, 4); 1193 sdp_set_ip_ver(sdp_mask, 0xF); 1194 sdp_data->dst_addr.ip4.addr = ip4_addr; 1195 sdp_mask->dst_addr.ip4.addr = htonl(~0); 1196 } else { 1197 cma_set_ip_ver(cma_data, 4); 1198 cma_set_ip_ver(cma_mask, 0xF); 1199 cma_data->dst_addr.ip4.addr = ip4_addr; 1200 cma_mask->dst_addr.ip4.addr = htonl(~0); 1201 } 1202 break; 1203 case AF_INET6: 1204 ip6_addr = ((struct sockaddr_in6 *) addr)->sin6_addr; 1205 if (ps == RDMA_PS_SDP) { 1206 sdp_set_ip_ver(sdp_data, 6); 1207 sdp_set_ip_ver(sdp_mask, 0xF); 1208 sdp_data->dst_addr.ip6 = ip6_addr; 1209 memset(&sdp_mask->dst_addr.ip6, 0xFF, 1210 sizeof sdp_mask->dst_addr.ip6); 1211 } else { 1212 cma_set_ip_ver(cma_data, 6); 1213 cma_set_ip_ver(cma_mask, 0xF); 1214 cma_data->dst_addr.ip6 = ip6_addr; 1215 memset(&cma_mask->dst_addr.ip6, 0xFF, 1216 sizeof cma_mask->dst_addr.ip6); 1217 } 1218 break; 1219 default: 1220 break; 1221 } 1222 } 1223 1224 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event) 1225 { 1226 struct rdma_id_private *id_priv = iw_id->context; 1227 struct rdma_cm_event event; 1228 struct sockaddr_in *sin; 1229 int ret = 0; 1230 1231 if (cma_disable_callback(id_priv, CMA_CONNECT)) 1232 return 0; 1233 1234 memset(&event, 0, sizeof event); 1235 switch (iw_event->event) { 1236 case IW_CM_EVENT_CLOSE: 1237 event.event = RDMA_CM_EVENT_DISCONNECTED; 1238 break; 1239 case IW_CM_EVENT_CONNECT_REPLY: 1240 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr; 1241 *sin = iw_event->local_addr; 1242 sin = (struct sockaddr_in *) &id_priv->id.route.addr.dst_addr; 1243 *sin = iw_event->remote_addr; 1244 switch (iw_event->status) { 1245 case 0: 1246 event.event = RDMA_CM_EVENT_ESTABLISHED; 1247 break; 1248 case -ECONNRESET: 1249 case -ECONNREFUSED: 1250 event.event = RDMA_CM_EVENT_REJECTED; 1251 break; 1252 case -ETIMEDOUT: 1253 event.event = RDMA_CM_EVENT_UNREACHABLE; 1254 break; 1255 default: 1256 event.event = RDMA_CM_EVENT_CONNECT_ERROR; 1257 break; 1258 } 1259 break; 1260 case IW_CM_EVENT_ESTABLISHED: 1261 event.event = RDMA_CM_EVENT_ESTABLISHED; 1262 break; 1263 default: 1264 BUG_ON(1); 1265 } 1266 1267 event.status = iw_event->status; 1268 event.param.conn.private_data = iw_event->private_data; 1269 event.param.conn.private_data_len = iw_event->private_data_len; 1270 ret = id_priv->id.event_handler(&id_priv->id, &event); 1271 if (ret) { 1272 /* Destroy the CM ID by returning a non-zero value. */ 1273 id_priv->cm_id.iw = NULL; 1274 cma_exch(id_priv, CMA_DESTROYING); 1275 mutex_unlock(&id_priv->handler_mutex); 1276 rdma_destroy_id(&id_priv->id); 1277 return ret; 1278 } 1279 1280 mutex_unlock(&id_priv->handler_mutex); 1281 return ret; 1282 } 1283 1284 static int iw_conn_req_handler(struct iw_cm_id *cm_id, 1285 struct iw_cm_event *iw_event) 1286 { 1287 struct rdma_cm_id *new_cm_id; 1288 struct rdma_id_private *listen_id, *conn_id; 1289 struct sockaddr_in *sin; 1290 struct net_device *dev = NULL; 1291 struct rdma_cm_event event; 1292 int ret; 1293 struct ib_device_attr attr; 1294 1295 listen_id = cm_id->context; 1296 if (cma_disable_callback(listen_id, CMA_LISTEN)) 1297 return -ECONNABORTED; 1298 1299 /* Create a new RDMA id for the new IW CM ID */ 1300 new_cm_id = rdma_create_id(listen_id->id.event_handler, 1301 listen_id->id.context, 1302 RDMA_PS_TCP); 1303 if (IS_ERR(new_cm_id)) { 1304 ret = -ENOMEM; 1305 goto out; 1306 } 1307 conn_id = container_of(new_cm_id, struct rdma_id_private, id); 1308 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING); 1309 conn_id->state = CMA_CONNECT; 1310 1311 dev = ip_dev_find(&init_net, iw_event->local_addr.sin_addr.s_addr); 1312 if (!dev) { 1313 ret = -EADDRNOTAVAIL; 1314 mutex_unlock(&conn_id->handler_mutex); 1315 rdma_destroy_id(new_cm_id); 1316 goto out; 1317 } 1318 ret = rdma_copy_addr(&conn_id->id.route.addr.dev_addr, dev, NULL); 1319 if (ret) { 1320 mutex_unlock(&conn_id->handler_mutex); 1321 rdma_destroy_id(new_cm_id); 1322 goto out; 1323 } 1324 1325 mutex_lock(&lock); 1326 ret = cma_acquire_dev(conn_id); 1327 mutex_unlock(&lock); 1328 if (ret) { 1329 mutex_unlock(&conn_id->handler_mutex); 1330 rdma_destroy_id(new_cm_id); 1331 goto out; 1332 } 1333 1334 conn_id->cm_id.iw = cm_id; 1335 cm_id->context = conn_id; 1336 cm_id->cm_handler = cma_iw_handler; 1337 1338 sin = (struct sockaddr_in *) &new_cm_id->route.addr.src_addr; 1339 *sin = iw_event->local_addr; 1340 sin = (struct sockaddr_in *) &new_cm_id->route.addr.dst_addr; 1341 *sin = iw_event->remote_addr; 1342 1343 ret = ib_query_device(conn_id->id.device, &attr); 1344 if (ret) { 1345 mutex_unlock(&conn_id->handler_mutex); 1346 rdma_destroy_id(new_cm_id); 1347 goto out; 1348 } 1349 1350 memset(&event, 0, sizeof event); 1351 event.event = RDMA_CM_EVENT_CONNECT_REQUEST; 1352 event.param.conn.private_data = iw_event->private_data; 1353 event.param.conn.private_data_len = iw_event->private_data_len; 1354 event.param.conn.initiator_depth = attr.max_qp_init_rd_atom; 1355 event.param.conn.responder_resources = attr.max_qp_rd_atom; 1356 ret = conn_id->id.event_handler(&conn_id->id, &event); 1357 if (ret) { 1358 /* User wants to destroy the CM ID */ 1359 conn_id->cm_id.iw = NULL; 1360 cma_exch(conn_id, CMA_DESTROYING); 1361 mutex_unlock(&conn_id->handler_mutex); 1362 rdma_destroy_id(&conn_id->id); 1363 goto out; 1364 } 1365 1366 mutex_unlock(&conn_id->handler_mutex); 1367 1368 out: 1369 if (dev) 1370 dev_put(dev); 1371 mutex_unlock(&listen_id->handler_mutex); 1372 return ret; 1373 } 1374 1375 static int cma_ib_listen(struct rdma_id_private *id_priv) 1376 { 1377 struct ib_cm_compare_data compare_data; 1378 struct sockaddr *addr; 1379 __be64 svc_id; 1380 int ret; 1381 1382 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_req_handler, 1383 id_priv); 1384 if (IS_ERR(id_priv->cm_id.ib)) 1385 return PTR_ERR(id_priv->cm_id.ib); 1386 1387 addr = (struct sockaddr *) &id_priv->id.route.addr.src_addr; 1388 svc_id = cma_get_service_id(id_priv->id.ps, addr); 1389 if (cma_any_addr(addr)) 1390 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, NULL); 1391 else { 1392 cma_set_compare_data(id_priv->id.ps, addr, &compare_data); 1393 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, &compare_data); 1394 } 1395 1396 if (ret) { 1397 ib_destroy_cm_id(id_priv->cm_id.ib); 1398 id_priv->cm_id.ib = NULL; 1399 } 1400 1401 return ret; 1402 } 1403 1404 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog) 1405 { 1406 int ret; 1407 struct sockaddr_in *sin; 1408 1409 id_priv->cm_id.iw = iw_create_cm_id(id_priv->id.device, 1410 iw_conn_req_handler, 1411 id_priv); 1412 if (IS_ERR(id_priv->cm_id.iw)) 1413 return PTR_ERR(id_priv->cm_id.iw); 1414 1415 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr; 1416 id_priv->cm_id.iw->local_addr = *sin; 1417 1418 ret = iw_cm_listen(id_priv->cm_id.iw, backlog); 1419 1420 if (ret) { 1421 iw_destroy_cm_id(id_priv->cm_id.iw); 1422 id_priv->cm_id.iw = NULL; 1423 } 1424 1425 return ret; 1426 } 1427 1428 static int cma_listen_handler(struct rdma_cm_id *id, 1429 struct rdma_cm_event *event) 1430 { 1431 struct rdma_id_private *id_priv = id->context; 1432 1433 id->context = id_priv->id.context; 1434 id->event_handler = id_priv->id.event_handler; 1435 return id_priv->id.event_handler(id, event); 1436 } 1437 1438 static void cma_listen_on_dev(struct rdma_id_private *id_priv, 1439 struct cma_device *cma_dev) 1440 { 1441 struct rdma_id_private *dev_id_priv; 1442 struct rdma_cm_id *id; 1443 int ret; 1444 1445 id = rdma_create_id(cma_listen_handler, id_priv, id_priv->id.ps); 1446 if (IS_ERR(id)) 1447 return; 1448 1449 dev_id_priv = container_of(id, struct rdma_id_private, id); 1450 1451 dev_id_priv->state = CMA_ADDR_BOUND; 1452 memcpy(&id->route.addr.src_addr, &id_priv->id.route.addr.src_addr, 1453 ip_addr_size((struct sockaddr *) &id_priv->id.route.addr.src_addr)); 1454 1455 cma_attach_to_dev(dev_id_priv, cma_dev); 1456 list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list); 1457 atomic_inc(&id_priv->refcount); 1458 dev_id_priv->internal_id = 1; 1459 1460 ret = rdma_listen(id, id_priv->backlog); 1461 if (ret) 1462 printk(KERN_WARNING "RDMA CMA: cma_listen_on_dev, error %d, " 1463 "listening on device %s\n", ret, cma_dev->device->name); 1464 } 1465 1466 static void cma_listen_on_all(struct rdma_id_private *id_priv) 1467 { 1468 struct cma_device *cma_dev; 1469 1470 mutex_lock(&lock); 1471 list_add_tail(&id_priv->list, &listen_any_list); 1472 list_for_each_entry(cma_dev, &dev_list, list) 1473 cma_listen_on_dev(id_priv, cma_dev); 1474 mutex_unlock(&lock); 1475 } 1476 1477 static int cma_bind_any(struct rdma_cm_id *id, sa_family_t af) 1478 { 1479 struct sockaddr_storage addr_in; 1480 1481 memset(&addr_in, 0, sizeof addr_in); 1482 addr_in.ss_family = af; 1483 return rdma_bind_addr(id, (struct sockaddr *) &addr_in); 1484 } 1485 1486 int rdma_listen(struct rdma_cm_id *id, int backlog) 1487 { 1488 struct rdma_id_private *id_priv; 1489 int ret; 1490 1491 id_priv = container_of(id, struct rdma_id_private, id); 1492 if (id_priv->state == CMA_IDLE) { 1493 ret = cma_bind_any(id, AF_INET); 1494 if (ret) 1495 return ret; 1496 } 1497 1498 if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_LISTEN)) 1499 return -EINVAL; 1500 1501 id_priv->backlog = backlog; 1502 if (id->device) { 1503 switch (rdma_node_get_transport(id->device->node_type)) { 1504 case RDMA_TRANSPORT_IB: 1505 ret = cma_ib_listen(id_priv); 1506 if (ret) 1507 goto err; 1508 break; 1509 case RDMA_TRANSPORT_IWARP: 1510 ret = cma_iw_listen(id_priv, backlog); 1511 if (ret) 1512 goto err; 1513 break; 1514 default: 1515 ret = -ENOSYS; 1516 goto err; 1517 } 1518 } else 1519 cma_listen_on_all(id_priv); 1520 1521 return 0; 1522 err: 1523 id_priv->backlog = 0; 1524 cma_comp_exch(id_priv, CMA_LISTEN, CMA_ADDR_BOUND); 1525 return ret; 1526 } 1527 EXPORT_SYMBOL(rdma_listen); 1528 1529 void rdma_set_service_type(struct rdma_cm_id *id, int tos) 1530 { 1531 struct rdma_id_private *id_priv; 1532 1533 id_priv = container_of(id, struct rdma_id_private, id); 1534 id_priv->tos = (u8) tos; 1535 } 1536 EXPORT_SYMBOL(rdma_set_service_type); 1537 1538 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec, 1539 void *context) 1540 { 1541 struct cma_work *work = context; 1542 struct rdma_route *route; 1543 1544 route = &work->id->id.route; 1545 1546 if (!status) { 1547 route->num_paths = 1; 1548 *route->path_rec = *path_rec; 1549 } else { 1550 work->old_state = CMA_ROUTE_QUERY; 1551 work->new_state = CMA_ADDR_RESOLVED; 1552 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR; 1553 work->event.status = status; 1554 } 1555 1556 queue_work(cma_wq, &work->work); 1557 } 1558 1559 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms, 1560 struct cma_work *work) 1561 { 1562 struct rdma_addr *addr = &id_priv->id.route.addr; 1563 struct ib_sa_path_rec path_rec; 1564 ib_sa_comp_mask comp_mask; 1565 struct sockaddr_in6 *sin6; 1566 1567 memset(&path_rec, 0, sizeof path_rec); 1568 ib_addr_get_sgid(&addr->dev_addr, &path_rec.sgid); 1569 ib_addr_get_dgid(&addr->dev_addr, &path_rec.dgid); 1570 path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(&addr->dev_addr)); 1571 path_rec.numb_path = 1; 1572 path_rec.reversible = 1; 1573 path_rec.service_id = cma_get_service_id(id_priv->id.ps, 1574 (struct sockaddr *) &addr->dst_addr); 1575 1576 comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID | 1577 IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH | 1578 IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID; 1579 1580 if (addr->src_addr.ss_family == AF_INET) { 1581 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos); 1582 comp_mask |= IB_SA_PATH_REC_QOS_CLASS; 1583 } else { 1584 sin6 = (struct sockaddr_in6 *) &addr->src_addr; 1585 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20); 1586 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS; 1587 } 1588 1589 id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device, 1590 id_priv->id.port_num, &path_rec, 1591 comp_mask, timeout_ms, 1592 GFP_KERNEL, cma_query_handler, 1593 work, &id_priv->query); 1594 1595 return (id_priv->query_id < 0) ? id_priv->query_id : 0; 1596 } 1597 1598 static void cma_work_handler(struct work_struct *_work) 1599 { 1600 struct cma_work *work = container_of(_work, struct cma_work, work); 1601 struct rdma_id_private *id_priv = work->id; 1602 int destroy = 0; 1603 1604 mutex_lock(&id_priv->handler_mutex); 1605 if (!cma_comp_exch(id_priv, work->old_state, work->new_state)) 1606 goto out; 1607 1608 if (id_priv->id.event_handler(&id_priv->id, &work->event)) { 1609 cma_exch(id_priv, CMA_DESTROYING); 1610 destroy = 1; 1611 } 1612 out: 1613 mutex_unlock(&id_priv->handler_mutex); 1614 cma_deref_id(id_priv); 1615 if (destroy) 1616 rdma_destroy_id(&id_priv->id); 1617 kfree(work); 1618 } 1619 1620 static void cma_ndev_work_handler(struct work_struct *_work) 1621 { 1622 struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work); 1623 struct rdma_id_private *id_priv = work->id; 1624 int destroy = 0; 1625 1626 mutex_lock(&id_priv->handler_mutex); 1627 if (id_priv->state == CMA_DESTROYING || 1628 id_priv->state == CMA_DEVICE_REMOVAL) 1629 goto out; 1630 1631 if (id_priv->id.event_handler(&id_priv->id, &work->event)) { 1632 cma_exch(id_priv, CMA_DESTROYING); 1633 destroy = 1; 1634 } 1635 1636 out: 1637 mutex_unlock(&id_priv->handler_mutex); 1638 cma_deref_id(id_priv); 1639 if (destroy) 1640 rdma_destroy_id(&id_priv->id); 1641 kfree(work); 1642 } 1643 1644 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms) 1645 { 1646 struct rdma_route *route = &id_priv->id.route; 1647 struct cma_work *work; 1648 int ret; 1649 1650 work = kzalloc(sizeof *work, GFP_KERNEL); 1651 if (!work) 1652 return -ENOMEM; 1653 1654 work->id = id_priv; 1655 INIT_WORK(&work->work, cma_work_handler); 1656 work->old_state = CMA_ROUTE_QUERY; 1657 work->new_state = CMA_ROUTE_RESOLVED; 1658 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED; 1659 1660 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL); 1661 if (!route->path_rec) { 1662 ret = -ENOMEM; 1663 goto err1; 1664 } 1665 1666 ret = cma_query_ib_route(id_priv, timeout_ms, work); 1667 if (ret) 1668 goto err2; 1669 1670 return 0; 1671 err2: 1672 kfree(route->path_rec); 1673 route->path_rec = NULL; 1674 err1: 1675 kfree(work); 1676 return ret; 1677 } 1678 1679 int rdma_set_ib_paths(struct rdma_cm_id *id, 1680 struct ib_sa_path_rec *path_rec, int num_paths) 1681 { 1682 struct rdma_id_private *id_priv; 1683 int ret; 1684 1685 id_priv = container_of(id, struct rdma_id_private, id); 1686 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_RESOLVED)) 1687 return -EINVAL; 1688 1689 id->route.path_rec = kmalloc(sizeof *path_rec * num_paths, GFP_KERNEL); 1690 if (!id->route.path_rec) { 1691 ret = -ENOMEM; 1692 goto err; 1693 } 1694 1695 memcpy(id->route.path_rec, path_rec, sizeof *path_rec * num_paths); 1696 return 0; 1697 err: 1698 cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_ADDR_RESOLVED); 1699 return ret; 1700 } 1701 EXPORT_SYMBOL(rdma_set_ib_paths); 1702 1703 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms) 1704 { 1705 struct cma_work *work; 1706 1707 work = kzalloc(sizeof *work, GFP_KERNEL); 1708 if (!work) 1709 return -ENOMEM; 1710 1711 work->id = id_priv; 1712 INIT_WORK(&work->work, cma_work_handler); 1713 work->old_state = CMA_ROUTE_QUERY; 1714 work->new_state = CMA_ROUTE_RESOLVED; 1715 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED; 1716 queue_work(cma_wq, &work->work); 1717 return 0; 1718 } 1719 1720 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms) 1721 { 1722 struct rdma_id_private *id_priv; 1723 int ret; 1724 1725 id_priv = container_of(id, struct rdma_id_private, id); 1726 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_QUERY)) 1727 return -EINVAL; 1728 1729 atomic_inc(&id_priv->refcount); 1730 switch (rdma_node_get_transport(id->device->node_type)) { 1731 case RDMA_TRANSPORT_IB: 1732 ret = cma_resolve_ib_route(id_priv, timeout_ms); 1733 break; 1734 case RDMA_TRANSPORT_IWARP: 1735 ret = cma_resolve_iw_route(id_priv, timeout_ms); 1736 break; 1737 default: 1738 ret = -ENOSYS; 1739 break; 1740 } 1741 if (ret) 1742 goto err; 1743 1744 return 0; 1745 err: 1746 cma_comp_exch(id_priv, CMA_ROUTE_QUERY, CMA_ADDR_RESOLVED); 1747 cma_deref_id(id_priv); 1748 return ret; 1749 } 1750 EXPORT_SYMBOL(rdma_resolve_route); 1751 1752 static int cma_bind_loopback(struct rdma_id_private *id_priv) 1753 { 1754 struct cma_device *cma_dev; 1755 struct ib_port_attr port_attr; 1756 union ib_gid gid; 1757 u16 pkey; 1758 int ret; 1759 u8 p; 1760 1761 mutex_lock(&lock); 1762 if (list_empty(&dev_list)) { 1763 ret = -ENODEV; 1764 goto out; 1765 } 1766 list_for_each_entry(cma_dev, &dev_list, list) 1767 for (p = 1; p <= cma_dev->device->phys_port_cnt; ++p) 1768 if (!ib_query_port(cma_dev->device, p, &port_attr) && 1769 port_attr.state == IB_PORT_ACTIVE) 1770 goto port_found; 1771 1772 p = 1; 1773 cma_dev = list_entry(dev_list.next, struct cma_device, list); 1774 1775 port_found: 1776 ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid); 1777 if (ret) 1778 goto out; 1779 1780 ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey); 1781 if (ret) 1782 goto out; 1783 1784 ib_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid); 1785 ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey); 1786 id_priv->id.port_num = p; 1787 cma_attach_to_dev(id_priv, cma_dev); 1788 out: 1789 mutex_unlock(&lock); 1790 return ret; 1791 } 1792 1793 static void addr_handler(int status, struct sockaddr *src_addr, 1794 struct rdma_dev_addr *dev_addr, void *context) 1795 { 1796 struct rdma_id_private *id_priv = context; 1797 struct rdma_cm_event event; 1798 1799 memset(&event, 0, sizeof event); 1800 mutex_lock(&id_priv->handler_mutex); 1801 1802 /* 1803 * Grab mutex to block rdma_destroy_id() from removing the device while 1804 * we're trying to acquire it. 1805 */ 1806 mutex_lock(&lock); 1807 if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_RESOLVED)) { 1808 mutex_unlock(&lock); 1809 goto out; 1810 } 1811 1812 if (!status && !id_priv->cma_dev) 1813 status = cma_acquire_dev(id_priv); 1814 mutex_unlock(&lock); 1815 1816 if (status) { 1817 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ADDR_BOUND)) 1818 goto out; 1819 event.event = RDMA_CM_EVENT_ADDR_ERROR; 1820 event.status = status; 1821 } else { 1822 memcpy(&id_priv->id.route.addr.src_addr, src_addr, 1823 ip_addr_size(src_addr)); 1824 event.event = RDMA_CM_EVENT_ADDR_RESOLVED; 1825 } 1826 1827 if (id_priv->id.event_handler(&id_priv->id, &event)) { 1828 cma_exch(id_priv, CMA_DESTROYING); 1829 mutex_unlock(&id_priv->handler_mutex); 1830 cma_deref_id(id_priv); 1831 rdma_destroy_id(&id_priv->id); 1832 return; 1833 } 1834 out: 1835 mutex_unlock(&id_priv->handler_mutex); 1836 cma_deref_id(id_priv); 1837 } 1838 1839 static int cma_resolve_loopback(struct rdma_id_private *id_priv) 1840 { 1841 struct cma_work *work; 1842 struct sockaddr_in *src_in, *dst_in; 1843 union ib_gid gid; 1844 int ret; 1845 1846 work = kzalloc(sizeof *work, GFP_KERNEL); 1847 if (!work) 1848 return -ENOMEM; 1849 1850 if (!id_priv->cma_dev) { 1851 ret = cma_bind_loopback(id_priv); 1852 if (ret) 1853 goto err; 1854 } 1855 1856 ib_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid); 1857 ib_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid); 1858 1859 if (cma_zero_addr((struct sockaddr *) &id_priv->id.route.addr.src_addr)) { 1860 src_in = (struct sockaddr_in *)&id_priv->id.route.addr.src_addr; 1861 dst_in = (struct sockaddr_in *)&id_priv->id.route.addr.dst_addr; 1862 src_in->sin_family = dst_in->sin_family; 1863 src_in->sin_addr.s_addr = dst_in->sin_addr.s_addr; 1864 } 1865 1866 work->id = id_priv; 1867 INIT_WORK(&work->work, cma_work_handler); 1868 work->old_state = CMA_ADDR_QUERY; 1869 work->new_state = CMA_ADDR_RESOLVED; 1870 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED; 1871 queue_work(cma_wq, &work->work); 1872 return 0; 1873 err: 1874 kfree(work); 1875 return ret; 1876 } 1877 1878 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr, 1879 struct sockaddr *dst_addr) 1880 { 1881 if (src_addr && src_addr->sa_family) 1882 return rdma_bind_addr(id, src_addr); 1883 else 1884 return cma_bind_any(id, dst_addr->sa_family); 1885 } 1886 1887 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr, 1888 struct sockaddr *dst_addr, int timeout_ms) 1889 { 1890 struct rdma_id_private *id_priv; 1891 int ret; 1892 1893 id_priv = container_of(id, struct rdma_id_private, id); 1894 if (id_priv->state == CMA_IDLE) { 1895 ret = cma_bind_addr(id, src_addr, dst_addr); 1896 if (ret) 1897 return ret; 1898 } 1899 1900 if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_ADDR_QUERY)) 1901 return -EINVAL; 1902 1903 atomic_inc(&id_priv->refcount); 1904 memcpy(&id->route.addr.dst_addr, dst_addr, ip_addr_size(dst_addr)); 1905 if (cma_any_addr(dst_addr)) 1906 ret = cma_resolve_loopback(id_priv); 1907 else 1908 ret = rdma_resolve_ip(&addr_client, (struct sockaddr *) &id->route.addr.src_addr, 1909 dst_addr, &id->route.addr.dev_addr, 1910 timeout_ms, addr_handler, id_priv); 1911 if (ret) 1912 goto err; 1913 1914 return 0; 1915 err: 1916 cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_BOUND); 1917 cma_deref_id(id_priv); 1918 return ret; 1919 } 1920 EXPORT_SYMBOL(rdma_resolve_addr); 1921 1922 static void cma_bind_port(struct rdma_bind_list *bind_list, 1923 struct rdma_id_private *id_priv) 1924 { 1925 struct sockaddr_in *sin; 1926 1927 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr; 1928 sin->sin_port = htons(bind_list->port); 1929 id_priv->bind_list = bind_list; 1930 hlist_add_head(&id_priv->node, &bind_list->owners); 1931 } 1932 1933 static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv, 1934 unsigned short snum) 1935 { 1936 struct rdma_bind_list *bind_list; 1937 int port, ret; 1938 1939 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL); 1940 if (!bind_list) 1941 return -ENOMEM; 1942 1943 do { 1944 ret = idr_get_new_above(ps, bind_list, snum, &port); 1945 } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL)); 1946 1947 if (ret) 1948 goto err1; 1949 1950 if (port != snum) { 1951 ret = -EADDRNOTAVAIL; 1952 goto err2; 1953 } 1954 1955 bind_list->ps = ps; 1956 bind_list->port = (unsigned short) port; 1957 cma_bind_port(bind_list, id_priv); 1958 return 0; 1959 err2: 1960 idr_remove(ps, port); 1961 err1: 1962 kfree(bind_list); 1963 return ret; 1964 } 1965 1966 static int cma_alloc_any_port(struct idr *ps, struct rdma_id_private *id_priv) 1967 { 1968 struct rdma_bind_list *bind_list; 1969 int port, ret, low, high; 1970 1971 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL); 1972 if (!bind_list) 1973 return -ENOMEM; 1974 1975 retry: 1976 /* FIXME: add proper port randomization per like inet_csk_get_port */ 1977 do { 1978 ret = idr_get_new_above(ps, bind_list, next_port, &port); 1979 } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL)); 1980 1981 if (ret) 1982 goto err1; 1983 1984 inet_get_local_port_range(&low, &high); 1985 if (port > high) { 1986 if (next_port != low) { 1987 idr_remove(ps, port); 1988 next_port = low; 1989 goto retry; 1990 } 1991 ret = -EADDRNOTAVAIL; 1992 goto err2; 1993 } 1994 1995 if (port == high) 1996 next_port = low; 1997 else 1998 next_port = port + 1; 1999 2000 bind_list->ps = ps; 2001 bind_list->port = (unsigned short) port; 2002 cma_bind_port(bind_list, id_priv); 2003 return 0; 2004 err2: 2005 idr_remove(ps, port); 2006 err1: 2007 kfree(bind_list); 2008 return ret; 2009 } 2010 2011 static int cma_use_port(struct idr *ps, struct rdma_id_private *id_priv) 2012 { 2013 struct rdma_id_private *cur_id; 2014 struct sockaddr_in *sin, *cur_sin; 2015 struct rdma_bind_list *bind_list; 2016 struct hlist_node *node; 2017 unsigned short snum; 2018 2019 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr; 2020 snum = ntohs(sin->sin_port); 2021 if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 2022 return -EACCES; 2023 2024 bind_list = idr_find(ps, snum); 2025 if (!bind_list) 2026 return cma_alloc_port(ps, id_priv, snum); 2027 2028 /* 2029 * We don't support binding to any address if anyone is bound to 2030 * a specific address on the same port. 2031 */ 2032 if (cma_any_addr((struct sockaddr *) &id_priv->id.route.addr.src_addr)) 2033 return -EADDRNOTAVAIL; 2034 2035 hlist_for_each_entry(cur_id, node, &bind_list->owners, node) { 2036 if (cma_any_addr((struct sockaddr *) &cur_id->id.route.addr.src_addr)) 2037 return -EADDRNOTAVAIL; 2038 2039 cur_sin = (struct sockaddr_in *) &cur_id->id.route.addr.src_addr; 2040 if (sin->sin_addr.s_addr == cur_sin->sin_addr.s_addr) 2041 return -EADDRINUSE; 2042 } 2043 2044 cma_bind_port(bind_list, id_priv); 2045 return 0; 2046 } 2047 2048 static int cma_get_port(struct rdma_id_private *id_priv) 2049 { 2050 struct idr *ps; 2051 int ret; 2052 2053 switch (id_priv->id.ps) { 2054 case RDMA_PS_SDP: 2055 ps = &sdp_ps; 2056 break; 2057 case RDMA_PS_TCP: 2058 ps = &tcp_ps; 2059 break; 2060 case RDMA_PS_UDP: 2061 ps = &udp_ps; 2062 break; 2063 case RDMA_PS_IPOIB: 2064 ps = &ipoib_ps; 2065 break; 2066 default: 2067 return -EPROTONOSUPPORT; 2068 } 2069 2070 mutex_lock(&lock); 2071 if (cma_any_port((struct sockaddr *) &id_priv->id.route.addr.src_addr)) 2072 ret = cma_alloc_any_port(ps, id_priv); 2073 else 2074 ret = cma_use_port(ps, id_priv); 2075 mutex_unlock(&lock); 2076 2077 return ret; 2078 } 2079 2080 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr) 2081 { 2082 struct rdma_id_private *id_priv; 2083 int ret; 2084 2085 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6) 2086 return -EAFNOSUPPORT; 2087 2088 id_priv = container_of(id, struct rdma_id_private, id); 2089 if (!cma_comp_exch(id_priv, CMA_IDLE, CMA_ADDR_BOUND)) 2090 return -EINVAL; 2091 2092 if (!cma_any_addr(addr)) { 2093 ret = rdma_translate_ip(addr, &id->route.addr.dev_addr); 2094 if (ret) 2095 goto err1; 2096 2097 mutex_lock(&lock); 2098 ret = cma_acquire_dev(id_priv); 2099 mutex_unlock(&lock); 2100 if (ret) 2101 goto err1; 2102 } 2103 2104 memcpy(&id->route.addr.src_addr, addr, ip_addr_size(addr)); 2105 ret = cma_get_port(id_priv); 2106 if (ret) 2107 goto err2; 2108 2109 return 0; 2110 err2: 2111 if (!cma_any_addr(addr)) { 2112 mutex_lock(&lock); 2113 cma_detach_from_dev(id_priv); 2114 mutex_unlock(&lock); 2115 } 2116 err1: 2117 cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_IDLE); 2118 return ret; 2119 } 2120 EXPORT_SYMBOL(rdma_bind_addr); 2121 2122 static int cma_format_hdr(void *hdr, enum rdma_port_space ps, 2123 struct rdma_route *route) 2124 { 2125 struct cma_hdr *cma_hdr; 2126 struct sdp_hh *sdp_hdr; 2127 2128 if (route->addr.src_addr.ss_family == AF_INET) { 2129 struct sockaddr_in *src4, *dst4; 2130 2131 src4 = (struct sockaddr_in *) &route->addr.src_addr; 2132 dst4 = (struct sockaddr_in *) &route->addr.dst_addr; 2133 2134 switch (ps) { 2135 case RDMA_PS_SDP: 2136 sdp_hdr = hdr; 2137 if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION) 2138 return -EINVAL; 2139 sdp_set_ip_ver(sdp_hdr, 4); 2140 sdp_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr; 2141 sdp_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr; 2142 sdp_hdr->port = src4->sin_port; 2143 break; 2144 default: 2145 cma_hdr = hdr; 2146 cma_hdr->cma_version = CMA_VERSION; 2147 cma_set_ip_ver(cma_hdr, 4); 2148 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr; 2149 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr; 2150 cma_hdr->port = src4->sin_port; 2151 break; 2152 } 2153 } else { 2154 struct sockaddr_in6 *src6, *dst6; 2155 2156 src6 = (struct sockaddr_in6 *) &route->addr.src_addr; 2157 dst6 = (struct sockaddr_in6 *) &route->addr.dst_addr; 2158 2159 switch (ps) { 2160 case RDMA_PS_SDP: 2161 sdp_hdr = hdr; 2162 if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION) 2163 return -EINVAL; 2164 sdp_set_ip_ver(sdp_hdr, 6); 2165 sdp_hdr->src_addr.ip6 = src6->sin6_addr; 2166 sdp_hdr->dst_addr.ip6 = dst6->sin6_addr; 2167 sdp_hdr->port = src6->sin6_port; 2168 break; 2169 default: 2170 cma_hdr = hdr; 2171 cma_hdr->cma_version = CMA_VERSION; 2172 cma_set_ip_ver(cma_hdr, 6); 2173 cma_hdr->src_addr.ip6 = src6->sin6_addr; 2174 cma_hdr->dst_addr.ip6 = dst6->sin6_addr; 2175 cma_hdr->port = src6->sin6_port; 2176 break; 2177 } 2178 } 2179 return 0; 2180 } 2181 2182 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id, 2183 struct ib_cm_event *ib_event) 2184 { 2185 struct rdma_id_private *id_priv = cm_id->context; 2186 struct rdma_cm_event event; 2187 struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd; 2188 int ret = 0; 2189 2190 if (cma_disable_callback(id_priv, CMA_CONNECT)) 2191 return 0; 2192 2193 memset(&event, 0, sizeof event); 2194 switch (ib_event->event) { 2195 case IB_CM_SIDR_REQ_ERROR: 2196 event.event = RDMA_CM_EVENT_UNREACHABLE; 2197 event.status = -ETIMEDOUT; 2198 break; 2199 case IB_CM_SIDR_REP_RECEIVED: 2200 event.param.ud.private_data = ib_event->private_data; 2201 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE; 2202 if (rep->status != IB_SIDR_SUCCESS) { 2203 event.event = RDMA_CM_EVENT_UNREACHABLE; 2204 event.status = ib_event->param.sidr_rep_rcvd.status; 2205 break; 2206 } 2207 ret = cma_set_qkey(id_priv); 2208 if (ret) { 2209 event.event = RDMA_CM_EVENT_ADDR_ERROR; 2210 event.status = -EINVAL; 2211 break; 2212 } 2213 if (id_priv->qkey != rep->qkey) { 2214 event.event = RDMA_CM_EVENT_UNREACHABLE; 2215 event.status = -EINVAL; 2216 break; 2217 } 2218 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num, 2219 id_priv->id.route.path_rec, 2220 &event.param.ud.ah_attr); 2221 event.param.ud.qp_num = rep->qpn; 2222 event.param.ud.qkey = rep->qkey; 2223 event.event = RDMA_CM_EVENT_ESTABLISHED; 2224 event.status = 0; 2225 break; 2226 default: 2227 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n", 2228 ib_event->event); 2229 goto out; 2230 } 2231 2232 ret = id_priv->id.event_handler(&id_priv->id, &event); 2233 if (ret) { 2234 /* Destroy the CM ID by returning a non-zero value. */ 2235 id_priv->cm_id.ib = NULL; 2236 cma_exch(id_priv, CMA_DESTROYING); 2237 mutex_unlock(&id_priv->handler_mutex); 2238 rdma_destroy_id(&id_priv->id); 2239 return ret; 2240 } 2241 out: 2242 mutex_unlock(&id_priv->handler_mutex); 2243 return ret; 2244 } 2245 2246 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv, 2247 struct rdma_conn_param *conn_param) 2248 { 2249 struct ib_cm_sidr_req_param req; 2250 struct rdma_route *route; 2251 int ret; 2252 2253 req.private_data_len = sizeof(struct cma_hdr) + 2254 conn_param->private_data_len; 2255 req.private_data = kzalloc(req.private_data_len, GFP_ATOMIC); 2256 if (!req.private_data) 2257 return -ENOMEM; 2258 2259 if (conn_param->private_data && conn_param->private_data_len) 2260 memcpy((void *) req.private_data + sizeof(struct cma_hdr), 2261 conn_param->private_data, conn_param->private_data_len); 2262 2263 route = &id_priv->id.route; 2264 ret = cma_format_hdr((void *) req.private_data, id_priv->id.ps, route); 2265 if (ret) 2266 goto out; 2267 2268 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, 2269 cma_sidr_rep_handler, id_priv); 2270 if (IS_ERR(id_priv->cm_id.ib)) { 2271 ret = PTR_ERR(id_priv->cm_id.ib); 2272 goto out; 2273 } 2274 2275 req.path = route->path_rec; 2276 req.service_id = cma_get_service_id(id_priv->id.ps, 2277 (struct sockaddr *) &route->addr.dst_addr); 2278 req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8); 2279 req.max_cm_retries = CMA_MAX_CM_RETRIES; 2280 2281 ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req); 2282 if (ret) { 2283 ib_destroy_cm_id(id_priv->cm_id.ib); 2284 id_priv->cm_id.ib = NULL; 2285 } 2286 out: 2287 kfree(req.private_data); 2288 return ret; 2289 } 2290 2291 static int cma_connect_ib(struct rdma_id_private *id_priv, 2292 struct rdma_conn_param *conn_param) 2293 { 2294 struct ib_cm_req_param req; 2295 struct rdma_route *route; 2296 void *private_data; 2297 int offset, ret; 2298 2299 memset(&req, 0, sizeof req); 2300 offset = cma_user_data_offset(id_priv->id.ps); 2301 req.private_data_len = offset + conn_param->private_data_len; 2302 private_data = kzalloc(req.private_data_len, GFP_ATOMIC); 2303 if (!private_data) 2304 return -ENOMEM; 2305 2306 if (conn_param->private_data && conn_param->private_data_len) 2307 memcpy(private_data + offset, conn_param->private_data, 2308 conn_param->private_data_len); 2309 2310 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_ib_handler, 2311 id_priv); 2312 if (IS_ERR(id_priv->cm_id.ib)) { 2313 ret = PTR_ERR(id_priv->cm_id.ib); 2314 goto out; 2315 } 2316 2317 route = &id_priv->id.route; 2318 ret = cma_format_hdr(private_data, id_priv->id.ps, route); 2319 if (ret) 2320 goto out; 2321 req.private_data = private_data; 2322 2323 req.primary_path = &route->path_rec[0]; 2324 if (route->num_paths == 2) 2325 req.alternate_path = &route->path_rec[1]; 2326 2327 req.service_id = cma_get_service_id(id_priv->id.ps, 2328 (struct sockaddr *) &route->addr.dst_addr); 2329 req.qp_num = id_priv->qp_num; 2330 req.qp_type = IB_QPT_RC; 2331 req.starting_psn = id_priv->seq_num; 2332 req.responder_resources = conn_param->responder_resources; 2333 req.initiator_depth = conn_param->initiator_depth; 2334 req.flow_control = conn_param->flow_control; 2335 req.retry_count = conn_param->retry_count; 2336 req.rnr_retry_count = conn_param->rnr_retry_count; 2337 req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT; 2338 req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT; 2339 req.max_cm_retries = CMA_MAX_CM_RETRIES; 2340 req.srq = id_priv->srq ? 1 : 0; 2341 2342 ret = ib_send_cm_req(id_priv->cm_id.ib, &req); 2343 out: 2344 if (ret && !IS_ERR(id_priv->cm_id.ib)) { 2345 ib_destroy_cm_id(id_priv->cm_id.ib); 2346 id_priv->cm_id.ib = NULL; 2347 } 2348 2349 kfree(private_data); 2350 return ret; 2351 } 2352 2353 static int cma_connect_iw(struct rdma_id_private *id_priv, 2354 struct rdma_conn_param *conn_param) 2355 { 2356 struct iw_cm_id *cm_id; 2357 struct sockaddr_in* sin; 2358 int ret; 2359 struct iw_cm_conn_param iw_param; 2360 2361 cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv); 2362 if (IS_ERR(cm_id)) { 2363 ret = PTR_ERR(cm_id); 2364 goto out; 2365 } 2366 2367 id_priv->cm_id.iw = cm_id; 2368 2369 sin = (struct sockaddr_in*) &id_priv->id.route.addr.src_addr; 2370 cm_id->local_addr = *sin; 2371 2372 sin = (struct sockaddr_in*) &id_priv->id.route.addr.dst_addr; 2373 cm_id->remote_addr = *sin; 2374 2375 ret = cma_modify_qp_rtr(id_priv, conn_param); 2376 if (ret) 2377 goto out; 2378 2379 iw_param.ord = conn_param->initiator_depth; 2380 iw_param.ird = conn_param->responder_resources; 2381 iw_param.private_data = conn_param->private_data; 2382 iw_param.private_data_len = conn_param->private_data_len; 2383 if (id_priv->id.qp) 2384 iw_param.qpn = id_priv->qp_num; 2385 else 2386 iw_param.qpn = conn_param->qp_num; 2387 ret = iw_cm_connect(cm_id, &iw_param); 2388 out: 2389 if (ret && !IS_ERR(cm_id)) { 2390 iw_destroy_cm_id(cm_id); 2391 id_priv->cm_id.iw = NULL; 2392 } 2393 return ret; 2394 } 2395 2396 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param) 2397 { 2398 struct rdma_id_private *id_priv; 2399 int ret; 2400 2401 id_priv = container_of(id, struct rdma_id_private, id); 2402 if (!cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_CONNECT)) 2403 return -EINVAL; 2404 2405 if (!id->qp) { 2406 id_priv->qp_num = conn_param->qp_num; 2407 id_priv->srq = conn_param->srq; 2408 } 2409 2410 switch (rdma_node_get_transport(id->device->node_type)) { 2411 case RDMA_TRANSPORT_IB: 2412 if (cma_is_ud_ps(id->ps)) 2413 ret = cma_resolve_ib_udp(id_priv, conn_param); 2414 else 2415 ret = cma_connect_ib(id_priv, conn_param); 2416 break; 2417 case RDMA_TRANSPORT_IWARP: 2418 ret = cma_connect_iw(id_priv, conn_param); 2419 break; 2420 default: 2421 ret = -ENOSYS; 2422 break; 2423 } 2424 if (ret) 2425 goto err; 2426 2427 return 0; 2428 err: 2429 cma_comp_exch(id_priv, CMA_CONNECT, CMA_ROUTE_RESOLVED); 2430 return ret; 2431 } 2432 EXPORT_SYMBOL(rdma_connect); 2433 2434 static int cma_accept_ib(struct rdma_id_private *id_priv, 2435 struct rdma_conn_param *conn_param) 2436 { 2437 struct ib_cm_rep_param rep; 2438 int ret; 2439 2440 ret = cma_modify_qp_rtr(id_priv, conn_param); 2441 if (ret) 2442 goto out; 2443 2444 ret = cma_modify_qp_rts(id_priv, conn_param); 2445 if (ret) 2446 goto out; 2447 2448 memset(&rep, 0, sizeof rep); 2449 rep.qp_num = id_priv->qp_num; 2450 rep.starting_psn = id_priv->seq_num; 2451 rep.private_data = conn_param->private_data; 2452 rep.private_data_len = conn_param->private_data_len; 2453 rep.responder_resources = conn_param->responder_resources; 2454 rep.initiator_depth = conn_param->initiator_depth; 2455 rep.failover_accepted = 0; 2456 rep.flow_control = conn_param->flow_control; 2457 rep.rnr_retry_count = conn_param->rnr_retry_count; 2458 rep.srq = id_priv->srq ? 1 : 0; 2459 2460 ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep); 2461 out: 2462 return ret; 2463 } 2464 2465 static int cma_accept_iw(struct rdma_id_private *id_priv, 2466 struct rdma_conn_param *conn_param) 2467 { 2468 struct iw_cm_conn_param iw_param; 2469 int ret; 2470 2471 ret = cma_modify_qp_rtr(id_priv, conn_param); 2472 if (ret) 2473 return ret; 2474 2475 iw_param.ord = conn_param->initiator_depth; 2476 iw_param.ird = conn_param->responder_resources; 2477 iw_param.private_data = conn_param->private_data; 2478 iw_param.private_data_len = conn_param->private_data_len; 2479 if (id_priv->id.qp) { 2480 iw_param.qpn = id_priv->qp_num; 2481 } else 2482 iw_param.qpn = conn_param->qp_num; 2483 2484 return iw_cm_accept(id_priv->cm_id.iw, &iw_param); 2485 } 2486 2487 static int cma_send_sidr_rep(struct rdma_id_private *id_priv, 2488 enum ib_cm_sidr_status status, 2489 const void *private_data, int private_data_len) 2490 { 2491 struct ib_cm_sidr_rep_param rep; 2492 int ret; 2493 2494 memset(&rep, 0, sizeof rep); 2495 rep.status = status; 2496 if (status == IB_SIDR_SUCCESS) { 2497 ret = cma_set_qkey(id_priv); 2498 if (ret) 2499 return ret; 2500 rep.qp_num = id_priv->qp_num; 2501 rep.qkey = id_priv->qkey; 2502 } 2503 rep.private_data = private_data; 2504 rep.private_data_len = private_data_len; 2505 2506 return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep); 2507 } 2508 2509 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param) 2510 { 2511 struct rdma_id_private *id_priv; 2512 int ret; 2513 2514 id_priv = container_of(id, struct rdma_id_private, id); 2515 if (!cma_comp(id_priv, CMA_CONNECT)) 2516 return -EINVAL; 2517 2518 if (!id->qp && conn_param) { 2519 id_priv->qp_num = conn_param->qp_num; 2520 id_priv->srq = conn_param->srq; 2521 } 2522 2523 switch (rdma_node_get_transport(id->device->node_type)) { 2524 case RDMA_TRANSPORT_IB: 2525 if (cma_is_ud_ps(id->ps)) 2526 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS, 2527 conn_param->private_data, 2528 conn_param->private_data_len); 2529 else if (conn_param) 2530 ret = cma_accept_ib(id_priv, conn_param); 2531 else 2532 ret = cma_rep_recv(id_priv); 2533 break; 2534 case RDMA_TRANSPORT_IWARP: 2535 ret = cma_accept_iw(id_priv, conn_param); 2536 break; 2537 default: 2538 ret = -ENOSYS; 2539 break; 2540 } 2541 2542 if (ret) 2543 goto reject; 2544 2545 return 0; 2546 reject: 2547 cma_modify_qp_err(id_priv); 2548 rdma_reject(id, NULL, 0); 2549 return ret; 2550 } 2551 EXPORT_SYMBOL(rdma_accept); 2552 2553 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event) 2554 { 2555 struct rdma_id_private *id_priv; 2556 int ret; 2557 2558 id_priv = container_of(id, struct rdma_id_private, id); 2559 if (!cma_has_cm_dev(id_priv)) 2560 return -EINVAL; 2561 2562 switch (id->device->node_type) { 2563 case RDMA_NODE_IB_CA: 2564 ret = ib_cm_notify(id_priv->cm_id.ib, event); 2565 break; 2566 default: 2567 ret = 0; 2568 break; 2569 } 2570 return ret; 2571 } 2572 EXPORT_SYMBOL(rdma_notify); 2573 2574 int rdma_reject(struct rdma_cm_id *id, const void *private_data, 2575 u8 private_data_len) 2576 { 2577 struct rdma_id_private *id_priv; 2578 int ret; 2579 2580 id_priv = container_of(id, struct rdma_id_private, id); 2581 if (!cma_has_cm_dev(id_priv)) 2582 return -EINVAL; 2583 2584 switch (rdma_node_get_transport(id->device->node_type)) { 2585 case RDMA_TRANSPORT_IB: 2586 if (cma_is_ud_ps(id->ps)) 2587 ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 2588 private_data, private_data_len); 2589 else 2590 ret = ib_send_cm_rej(id_priv->cm_id.ib, 2591 IB_CM_REJ_CONSUMER_DEFINED, NULL, 2592 0, private_data, private_data_len); 2593 break; 2594 case RDMA_TRANSPORT_IWARP: 2595 ret = iw_cm_reject(id_priv->cm_id.iw, 2596 private_data, private_data_len); 2597 break; 2598 default: 2599 ret = -ENOSYS; 2600 break; 2601 } 2602 return ret; 2603 } 2604 EXPORT_SYMBOL(rdma_reject); 2605 2606 int rdma_disconnect(struct rdma_cm_id *id) 2607 { 2608 struct rdma_id_private *id_priv; 2609 int ret; 2610 2611 id_priv = container_of(id, struct rdma_id_private, id); 2612 if (!cma_has_cm_dev(id_priv)) 2613 return -EINVAL; 2614 2615 switch (rdma_node_get_transport(id->device->node_type)) { 2616 case RDMA_TRANSPORT_IB: 2617 ret = cma_modify_qp_err(id_priv); 2618 if (ret) 2619 goto out; 2620 /* Initiate or respond to a disconnect. */ 2621 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0)) 2622 ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0); 2623 break; 2624 case RDMA_TRANSPORT_IWARP: 2625 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0); 2626 break; 2627 default: 2628 ret = -EINVAL; 2629 break; 2630 } 2631 out: 2632 return ret; 2633 } 2634 EXPORT_SYMBOL(rdma_disconnect); 2635 2636 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast) 2637 { 2638 struct rdma_id_private *id_priv; 2639 struct cma_multicast *mc = multicast->context; 2640 struct rdma_cm_event event; 2641 int ret; 2642 2643 id_priv = mc->id_priv; 2644 if (cma_disable_callback(id_priv, CMA_ADDR_BOUND) && 2645 cma_disable_callback(id_priv, CMA_ADDR_RESOLVED)) 2646 return 0; 2647 2648 mutex_lock(&id_priv->qp_mutex); 2649 if (!status && id_priv->id.qp) 2650 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid, 2651 multicast->rec.mlid); 2652 mutex_unlock(&id_priv->qp_mutex); 2653 2654 memset(&event, 0, sizeof event); 2655 event.status = status; 2656 event.param.ud.private_data = mc->context; 2657 if (!status) { 2658 event.event = RDMA_CM_EVENT_MULTICAST_JOIN; 2659 ib_init_ah_from_mcmember(id_priv->id.device, 2660 id_priv->id.port_num, &multicast->rec, 2661 &event.param.ud.ah_attr); 2662 event.param.ud.qp_num = 0xFFFFFF; 2663 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey); 2664 } else 2665 event.event = RDMA_CM_EVENT_MULTICAST_ERROR; 2666 2667 ret = id_priv->id.event_handler(&id_priv->id, &event); 2668 if (ret) { 2669 cma_exch(id_priv, CMA_DESTROYING); 2670 mutex_unlock(&id_priv->handler_mutex); 2671 rdma_destroy_id(&id_priv->id); 2672 return 0; 2673 } 2674 2675 mutex_unlock(&id_priv->handler_mutex); 2676 return 0; 2677 } 2678 2679 static void cma_set_mgid(struct rdma_id_private *id_priv, 2680 struct sockaddr *addr, union ib_gid *mgid) 2681 { 2682 unsigned char mc_map[MAX_ADDR_LEN]; 2683 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr; 2684 struct sockaddr_in *sin = (struct sockaddr_in *) addr; 2685 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr; 2686 2687 if (cma_any_addr(addr)) { 2688 memset(mgid, 0, sizeof *mgid); 2689 } else if ((addr->sa_family == AF_INET6) && 2690 ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFF10A01B) == 2691 0xFF10A01B)) { 2692 /* IPv6 address is an SA assigned MGID. */ 2693 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid); 2694 } else { 2695 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map); 2696 if (id_priv->id.ps == RDMA_PS_UDP) 2697 mc_map[7] = 0x01; /* Use RDMA CM signature */ 2698 *mgid = *(union ib_gid *) (mc_map + 4); 2699 } 2700 } 2701 2702 static int cma_join_ib_multicast(struct rdma_id_private *id_priv, 2703 struct cma_multicast *mc) 2704 { 2705 struct ib_sa_mcmember_rec rec; 2706 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr; 2707 ib_sa_comp_mask comp_mask; 2708 int ret; 2709 2710 ib_addr_get_mgid(dev_addr, &rec.mgid); 2711 ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num, 2712 &rec.mgid, &rec); 2713 if (ret) 2714 return ret; 2715 2716 cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid); 2717 if (id_priv->id.ps == RDMA_PS_UDP) 2718 rec.qkey = cpu_to_be32(RDMA_UDP_QKEY); 2719 ib_addr_get_sgid(dev_addr, &rec.port_gid); 2720 rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr)); 2721 rec.join_state = 1; 2722 2723 comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID | 2724 IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE | 2725 IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL | 2726 IB_SA_MCMEMBER_REC_FLOW_LABEL | 2727 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS; 2728 2729 if (id_priv->id.ps == RDMA_PS_IPOIB) 2730 comp_mask |= IB_SA_MCMEMBER_REC_RATE | 2731 IB_SA_MCMEMBER_REC_RATE_SELECTOR; 2732 2733 mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device, 2734 id_priv->id.port_num, &rec, 2735 comp_mask, GFP_KERNEL, 2736 cma_ib_mc_handler, mc); 2737 if (IS_ERR(mc->multicast.ib)) 2738 return PTR_ERR(mc->multicast.ib); 2739 2740 return 0; 2741 } 2742 2743 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr, 2744 void *context) 2745 { 2746 struct rdma_id_private *id_priv; 2747 struct cma_multicast *mc; 2748 int ret; 2749 2750 id_priv = container_of(id, struct rdma_id_private, id); 2751 if (!cma_comp(id_priv, CMA_ADDR_BOUND) && 2752 !cma_comp(id_priv, CMA_ADDR_RESOLVED)) 2753 return -EINVAL; 2754 2755 mc = kmalloc(sizeof *mc, GFP_KERNEL); 2756 if (!mc) 2757 return -ENOMEM; 2758 2759 memcpy(&mc->addr, addr, ip_addr_size(addr)); 2760 mc->context = context; 2761 mc->id_priv = id_priv; 2762 2763 spin_lock(&id_priv->lock); 2764 list_add(&mc->list, &id_priv->mc_list); 2765 spin_unlock(&id_priv->lock); 2766 2767 switch (rdma_node_get_transport(id->device->node_type)) { 2768 case RDMA_TRANSPORT_IB: 2769 ret = cma_join_ib_multicast(id_priv, mc); 2770 break; 2771 default: 2772 ret = -ENOSYS; 2773 break; 2774 } 2775 2776 if (ret) { 2777 spin_lock_irq(&id_priv->lock); 2778 list_del(&mc->list); 2779 spin_unlock_irq(&id_priv->lock); 2780 kfree(mc); 2781 } 2782 return ret; 2783 } 2784 EXPORT_SYMBOL(rdma_join_multicast); 2785 2786 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr) 2787 { 2788 struct rdma_id_private *id_priv; 2789 struct cma_multicast *mc; 2790 2791 id_priv = container_of(id, struct rdma_id_private, id); 2792 spin_lock_irq(&id_priv->lock); 2793 list_for_each_entry(mc, &id_priv->mc_list, list) { 2794 if (!memcmp(&mc->addr, addr, ip_addr_size(addr))) { 2795 list_del(&mc->list); 2796 spin_unlock_irq(&id_priv->lock); 2797 2798 if (id->qp) 2799 ib_detach_mcast(id->qp, 2800 &mc->multicast.ib->rec.mgid, 2801 mc->multicast.ib->rec.mlid); 2802 ib_sa_free_multicast(mc->multicast.ib); 2803 kfree(mc); 2804 return; 2805 } 2806 } 2807 spin_unlock_irq(&id_priv->lock); 2808 } 2809 EXPORT_SYMBOL(rdma_leave_multicast); 2810 2811 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv) 2812 { 2813 struct rdma_dev_addr *dev_addr; 2814 struct cma_ndev_work *work; 2815 2816 dev_addr = &id_priv->id.route.addr.dev_addr; 2817 2818 if ((dev_addr->src_dev == ndev) && 2819 memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) { 2820 printk(KERN_INFO "RDMA CM addr change for ndev %s used by id %p\n", 2821 ndev->name, &id_priv->id); 2822 work = kzalloc(sizeof *work, GFP_KERNEL); 2823 if (!work) 2824 return -ENOMEM; 2825 2826 INIT_WORK(&work->work, cma_ndev_work_handler); 2827 work->id = id_priv; 2828 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE; 2829 atomic_inc(&id_priv->refcount); 2830 queue_work(cma_wq, &work->work); 2831 } 2832 2833 return 0; 2834 } 2835 2836 static int cma_netdev_callback(struct notifier_block *self, unsigned long event, 2837 void *ctx) 2838 { 2839 struct net_device *ndev = (struct net_device *)ctx; 2840 struct cma_device *cma_dev; 2841 struct rdma_id_private *id_priv; 2842 int ret = NOTIFY_DONE; 2843 2844 if (dev_net(ndev) != &init_net) 2845 return NOTIFY_DONE; 2846 2847 if (event != NETDEV_BONDING_FAILOVER) 2848 return NOTIFY_DONE; 2849 2850 if (!(ndev->flags & IFF_MASTER) || !(ndev->priv_flags & IFF_BONDING)) 2851 return NOTIFY_DONE; 2852 2853 mutex_lock(&lock); 2854 list_for_each_entry(cma_dev, &dev_list, list) 2855 list_for_each_entry(id_priv, &cma_dev->id_list, list) { 2856 ret = cma_netdev_change(ndev, id_priv); 2857 if (ret) 2858 goto out; 2859 } 2860 2861 out: 2862 mutex_unlock(&lock); 2863 return ret; 2864 } 2865 2866 static struct notifier_block cma_nb = { 2867 .notifier_call = cma_netdev_callback 2868 }; 2869 2870 static void cma_add_one(struct ib_device *device) 2871 { 2872 struct cma_device *cma_dev; 2873 struct rdma_id_private *id_priv; 2874 2875 cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL); 2876 if (!cma_dev) 2877 return; 2878 2879 cma_dev->device = device; 2880 2881 init_completion(&cma_dev->comp); 2882 atomic_set(&cma_dev->refcount, 1); 2883 INIT_LIST_HEAD(&cma_dev->id_list); 2884 ib_set_client_data(device, &cma_client, cma_dev); 2885 2886 mutex_lock(&lock); 2887 list_add_tail(&cma_dev->list, &dev_list); 2888 list_for_each_entry(id_priv, &listen_any_list, list) 2889 cma_listen_on_dev(id_priv, cma_dev); 2890 mutex_unlock(&lock); 2891 } 2892 2893 static int cma_remove_id_dev(struct rdma_id_private *id_priv) 2894 { 2895 struct rdma_cm_event event; 2896 enum cma_state state; 2897 int ret = 0; 2898 2899 /* Record that we want to remove the device */ 2900 state = cma_exch(id_priv, CMA_DEVICE_REMOVAL); 2901 if (state == CMA_DESTROYING) 2902 return 0; 2903 2904 cma_cancel_operation(id_priv, state); 2905 mutex_lock(&id_priv->handler_mutex); 2906 2907 /* Check for destruction from another callback. */ 2908 if (!cma_comp(id_priv, CMA_DEVICE_REMOVAL)) 2909 goto out; 2910 2911 memset(&event, 0, sizeof event); 2912 event.event = RDMA_CM_EVENT_DEVICE_REMOVAL; 2913 ret = id_priv->id.event_handler(&id_priv->id, &event); 2914 out: 2915 mutex_unlock(&id_priv->handler_mutex); 2916 return ret; 2917 } 2918 2919 static void cma_process_remove(struct cma_device *cma_dev) 2920 { 2921 struct rdma_id_private *id_priv; 2922 int ret; 2923 2924 mutex_lock(&lock); 2925 while (!list_empty(&cma_dev->id_list)) { 2926 id_priv = list_entry(cma_dev->id_list.next, 2927 struct rdma_id_private, list); 2928 2929 list_del(&id_priv->listen_list); 2930 list_del_init(&id_priv->list); 2931 atomic_inc(&id_priv->refcount); 2932 mutex_unlock(&lock); 2933 2934 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv); 2935 cma_deref_id(id_priv); 2936 if (ret) 2937 rdma_destroy_id(&id_priv->id); 2938 2939 mutex_lock(&lock); 2940 } 2941 mutex_unlock(&lock); 2942 2943 cma_deref_dev(cma_dev); 2944 wait_for_completion(&cma_dev->comp); 2945 } 2946 2947 static void cma_remove_one(struct ib_device *device) 2948 { 2949 struct cma_device *cma_dev; 2950 2951 cma_dev = ib_get_client_data(device, &cma_client); 2952 if (!cma_dev) 2953 return; 2954 2955 mutex_lock(&lock); 2956 list_del(&cma_dev->list); 2957 mutex_unlock(&lock); 2958 2959 cma_process_remove(cma_dev); 2960 kfree(cma_dev); 2961 } 2962 2963 static int cma_init(void) 2964 { 2965 int ret, low, high, remaining; 2966 2967 get_random_bytes(&next_port, sizeof next_port); 2968 inet_get_local_port_range(&low, &high); 2969 remaining = (high - low) + 1; 2970 next_port = ((unsigned int) next_port % remaining) + low; 2971 2972 cma_wq = create_singlethread_workqueue("rdma_cm"); 2973 if (!cma_wq) 2974 return -ENOMEM; 2975 2976 ib_sa_register_client(&sa_client); 2977 rdma_addr_register_client(&addr_client); 2978 register_netdevice_notifier(&cma_nb); 2979 2980 ret = ib_register_client(&cma_client); 2981 if (ret) 2982 goto err; 2983 return 0; 2984 2985 err: 2986 unregister_netdevice_notifier(&cma_nb); 2987 rdma_addr_unregister_client(&addr_client); 2988 ib_sa_unregister_client(&sa_client); 2989 destroy_workqueue(cma_wq); 2990 return ret; 2991 } 2992 2993 static void cma_cleanup(void) 2994 { 2995 ib_unregister_client(&cma_client); 2996 unregister_netdevice_notifier(&cma_nb); 2997 rdma_addr_unregister_client(&addr_client); 2998 ib_sa_unregister_client(&sa_client); 2999 destroy_workqueue(cma_wq); 3000 idr_destroy(&sdp_ps); 3001 idr_destroy(&tcp_ps); 3002 idr_destroy(&udp_ps); 3003 idr_destroy(&ipoib_ps); 3004 } 3005 3006 module_init(cma_init); 3007 module_exit(cma_cleanup); 3008