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 #include <linux/slab.h> 44 45 #include <net/tcp.h> 46 #include <net/ipv6.h> 47 48 #include <rdma/rdma_cm.h> 49 #include <rdma/rdma_cm_ib.h> 50 #include <rdma/ib_cache.h> 51 #include <rdma/ib_cm.h> 52 #include <rdma/ib_sa.h> 53 #include <rdma/iw_cm.h> 54 55 MODULE_AUTHOR("Sean Hefty"); 56 MODULE_DESCRIPTION("Generic RDMA CM Agent"); 57 MODULE_LICENSE("Dual BSD/GPL"); 58 59 #define CMA_CM_RESPONSE_TIMEOUT 20 60 #define CMA_MAX_CM_RETRIES 15 61 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24) 62 63 static void cma_add_one(struct ib_device *device); 64 static void cma_remove_one(struct ib_device *device); 65 66 static struct ib_client cma_client = { 67 .name = "cma", 68 .add = cma_add_one, 69 .remove = cma_remove_one 70 }; 71 72 static struct ib_sa_client sa_client; 73 static struct rdma_addr_client addr_client; 74 static LIST_HEAD(dev_list); 75 static LIST_HEAD(listen_any_list); 76 static DEFINE_MUTEX(lock); 77 static struct workqueue_struct *cma_wq; 78 static DEFINE_IDR(sdp_ps); 79 static DEFINE_IDR(tcp_ps); 80 static DEFINE_IDR(udp_ps); 81 static DEFINE_IDR(ipoib_ps); 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 rdma_addr_get_sgid(dev_addr, &gid); 334 list_for_each_entry(cma_dev, &dev_list, list) { 335 ret = ib_find_cached_gid(cma_dev->device, &gid, 336 &id_priv->id.port_num, NULL); 337 if (!ret) { 338 cma_attach_to_dev(id_priv, cma_dev); 339 break; 340 } 341 } 342 return ret; 343 } 344 345 static void cma_deref_id(struct rdma_id_private *id_priv) 346 { 347 if (atomic_dec_and_test(&id_priv->refcount)) 348 complete(&id_priv->comp); 349 } 350 351 static int cma_disable_callback(struct rdma_id_private *id_priv, 352 enum cma_state state) 353 { 354 mutex_lock(&id_priv->handler_mutex); 355 if (id_priv->state != state) { 356 mutex_unlock(&id_priv->handler_mutex); 357 return -EINVAL; 358 } 359 return 0; 360 } 361 362 static int cma_has_cm_dev(struct rdma_id_private *id_priv) 363 { 364 return (id_priv->id.device && id_priv->cm_id.ib); 365 } 366 367 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler, 368 void *context, enum rdma_port_space ps) 369 { 370 struct rdma_id_private *id_priv; 371 372 id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL); 373 if (!id_priv) 374 return ERR_PTR(-ENOMEM); 375 376 id_priv->state = CMA_IDLE; 377 id_priv->id.context = context; 378 id_priv->id.event_handler = event_handler; 379 id_priv->id.ps = ps; 380 spin_lock_init(&id_priv->lock); 381 mutex_init(&id_priv->qp_mutex); 382 init_completion(&id_priv->comp); 383 atomic_set(&id_priv->refcount, 1); 384 mutex_init(&id_priv->handler_mutex); 385 INIT_LIST_HEAD(&id_priv->listen_list); 386 INIT_LIST_HEAD(&id_priv->mc_list); 387 get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num); 388 389 return &id_priv->id; 390 } 391 EXPORT_SYMBOL(rdma_create_id); 392 393 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp) 394 { 395 struct ib_qp_attr qp_attr; 396 int qp_attr_mask, ret; 397 398 qp_attr.qp_state = IB_QPS_INIT; 399 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask); 400 if (ret) 401 return ret; 402 403 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 404 if (ret) 405 return ret; 406 407 qp_attr.qp_state = IB_QPS_RTR; 408 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE); 409 if (ret) 410 return ret; 411 412 qp_attr.qp_state = IB_QPS_RTS; 413 qp_attr.sq_psn = 0; 414 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN); 415 416 return ret; 417 } 418 419 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp) 420 { 421 struct ib_qp_attr qp_attr; 422 int qp_attr_mask, ret; 423 424 qp_attr.qp_state = IB_QPS_INIT; 425 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask); 426 if (ret) 427 return ret; 428 429 return ib_modify_qp(qp, &qp_attr, qp_attr_mask); 430 } 431 432 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd, 433 struct ib_qp_init_attr *qp_init_attr) 434 { 435 struct rdma_id_private *id_priv; 436 struct ib_qp *qp; 437 int ret; 438 439 id_priv = container_of(id, struct rdma_id_private, id); 440 if (id->device != pd->device) 441 return -EINVAL; 442 443 qp = ib_create_qp(pd, qp_init_attr); 444 if (IS_ERR(qp)) 445 return PTR_ERR(qp); 446 447 if (cma_is_ud_ps(id_priv->id.ps)) 448 ret = cma_init_ud_qp(id_priv, qp); 449 else 450 ret = cma_init_conn_qp(id_priv, qp); 451 if (ret) 452 goto err; 453 454 id->qp = qp; 455 id_priv->qp_num = qp->qp_num; 456 id_priv->srq = (qp->srq != NULL); 457 return 0; 458 err: 459 ib_destroy_qp(qp); 460 return ret; 461 } 462 EXPORT_SYMBOL(rdma_create_qp); 463 464 void rdma_destroy_qp(struct rdma_cm_id *id) 465 { 466 struct rdma_id_private *id_priv; 467 468 id_priv = container_of(id, struct rdma_id_private, id); 469 mutex_lock(&id_priv->qp_mutex); 470 ib_destroy_qp(id_priv->id.qp); 471 id_priv->id.qp = NULL; 472 mutex_unlock(&id_priv->qp_mutex); 473 } 474 EXPORT_SYMBOL(rdma_destroy_qp); 475 476 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv, 477 struct rdma_conn_param *conn_param) 478 { 479 struct ib_qp_attr qp_attr; 480 int qp_attr_mask, ret; 481 482 mutex_lock(&id_priv->qp_mutex); 483 if (!id_priv->id.qp) { 484 ret = 0; 485 goto out; 486 } 487 488 /* Need to update QP attributes from default values. */ 489 qp_attr.qp_state = IB_QPS_INIT; 490 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask); 491 if (ret) 492 goto out; 493 494 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask); 495 if (ret) 496 goto out; 497 498 qp_attr.qp_state = IB_QPS_RTR; 499 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask); 500 if (ret) 501 goto out; 502 503 if (conn_param) 504 qp_attr.max_dest_rd_atomic = conn_param->responder_resources; 505 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask); 506 out: 507 mutex_unlock(&id_priv->qp_mutex); 508 return ret; 509 } 510 511 static int cma_modify_qp_rts(struct rdma_id_private *id_priv, 512 struct rdma_conn_param *conn_param) 513 { 514 struct ib_qp_attr qp_attr; 515 int qp_attr_mask, ret; 516 517 mutex_lock(&id_priv->qp_mutex); 518 if (!id_priv->id.qp) { 519 ret = 0; 520 goto out; 521 } 522 523 qp_attr.qp_state = IB_QPS_RTS; 524 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask); 525 if (ret) 526 goto out; 527 528 if (conn_param) 529 qp_attr.max_rd_atomic = conn_param->initiator_depth; 530 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask); 531 out: 532 mutex_unlock(&id_priv->qp_mutex); 533 return ret; 534 } 535 536 static int cma_modify_qp_err(struct rdma_id_private *id_priv) 537 { 538 struct ib_qp_attr qp_attr; 539 int ret; 540 541 mutex_lock(&id_priv->qp_mutex); 542 if (!id_priv->id.qp) { 543 ret = 0; 544 goto out; 545 } 546 547 qp_attr.qp_state = IB_QPS_ERR; 548 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE); 549 out: 550 mutex_unlock(&id_priv->qp_mutex); 551 return ret; 552 } 553 554 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv, 555 struct ib_qp_attr *qp_attr, int *qp_attr_mask) 556 { 557 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr; 558 int ret; 559 560 ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num, 561 ib_addr_get_pkey(dev_addr), 562 &qp_attr->pkey_index); 563 if (ret) 564 return ret; 565 566 qp_attr->port_num = id_priv->id.port_num; 567 *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT; 568 569 if (cma_is_ud_ps(id_priv->id.ps)) { 570 ret = cma_set_qkey(id_priv); 571 if (ret) 572 return ret; 573 574 qp_attr->qkey = id_priv->qkey; 575 *qp_attr_mask |= IB_QP_QKEY; 576 } else { 577 qp_attr->qp_access_flags = 0; 578 *qp_attr_mask |= IB_QP_ACCESS_FLAGS; 579 } 580 return 0; 581 } 582 583 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr, 584 int *qp_attr_mask) 585 { 586 struct rdma_id_private *id_priv; 587 int ret = 0; 588 589 id_priv = container_of(id, struct rdma_id_private, id); 590 switch (rdma_node_get_transport(id_priv->id.device->node_type)) { 591 case RDMA_TRANSPORT_IB: 592 if (!id_priv->cm_id.ib || cma_is_ud_ps(id_priv->id.ps)) 593 ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask); 594 else 595 ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr, 596 qp_attr_mask); 597 if (qp_attr->qp_state == IB_QPS_RTR) 598 qp_attr->rq_psn = id_priv->seq_num; 599 break; 600 case RDMA_TRANSPORT_IWARP: 601 if (!id_priv->cm_id.iw) { 602 qp_attr->qp_access_flags = 0; 603 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS; 604 } else 605 ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr, 606 qp_attr_mask); 607 break; 608 default: 609 ret = -ENOSYS; 610 break; 611 } 612 613 return ret; 614 } 615 EXPORT_SYMBOL(rdma_init_qp_attr); 616 617 static inline int cma_zero_addr(struct sockaddr *addr) 618 { 619 struct in6_addr *ip6; 620 621 if (addr->sa_family == AF_INET) 622 return ipv4_is_zeronet( 623 ((struct sockaddr_in *)addr)->sin_addr.s_addr); 624 else { 625 ip6 = &((struct sockaddr_in6 *) addr)->sin6_addr; 626 return (ip6->s6_addr32[0] | ip6->s6_addr32[1] | 627 ip6->s6_addr32[2] | ip6->s6_addr32[3]) == 0; 628 } 629 } 630 631 static inline int cma_loopback_addr(struct sockaddr *addr) 632 { 633 if (addr->sa_family == AF_INET) 634 return ipv4_is_loopback( 635 ((struct sockaddr_in *) addr)->sin_addr.s_addr); 636 else 637 return ipv6_addr_loopback( 638 &((struct sockaddr_in6 *) addr)->sin6_addr); 639 } 640 641 static inline int cma_any_addr(struct sockaddr *addr) 642 { 643 return cma_zero_addr(addr) || cma_loopback_addr(addr); 644 } 645 646 static inline __be16 cma_port(struct sockaddr *addr) 647 { 648 if (addr->sa_family == AF_INET) 649 return ((struct sockaddr_in *) addr)->sin_port; 650 else 651 return ((struct sockaddr_in6 *) addr)->sin6_port; 652 } 653 654 static inline int cma_any_port(struct sockaddr *addr) 655 { 656 return !cma_port(addr); 657 } 658 659 static int cma_get_net_info(void *hdr, enum rdma_port_space ps, 660 u8 *ip_ver, __be16 *port, 661 union cma_ip_addr **src, union cma_ip_addr **dst) 662 { 663 switch (ps) { 664 case RDMA_PS_SDP: 665 if (sdp_get_majv(((struct sdp_hh *) hdr)->sdp_version) != 666 SDP_MAJ_VERSION) 667 return -EINVAL; 668 669 *ip_ver = sdp_get_ip_ver(hdr); 670 *port = ((struct sdp_hh *) hdr)->port; 671 *src = &((struct sdp_hh *) hdr)->src_addr; 672 *dst = &((struct sdp_hh *) hdr)->dst_addr; 673 break; 674 default: 675 if (((struct cma_hdr *) hdr)->cma_version != CMA_VERSION) 676 return -EINVAL; 677 678 *ip_ver = cma_get_ip_ver(hdr); 679 *port = ((struct cma_hdr *) hdr)->port; 680 *src = &((struct cma_hdr *) hdr)->src_addr; 681 *dst = &((struct cma_hdr *) hdr)->dst_addr; 682 break; 683 } 684 685 if (*ip_ver != 4 && *ip_ver != 6) 686 return -EINVAL; 687 return 0; 688 } 689 690 static void cma_save_net_info(struct rdma_addr *addr, 691 struct rdma_addr *listen_addr, 692 u8 ip_ver, __be16 port, 693 union cma_ip_addr *src, union cma_ip_addr *dst) 694 { 695 struct sockaddr_in *listen4, *ip4; 696 struct sockaddr_in6 *listen6, *ip6; 697 698 switch (ip_ver) { 699 case 4: 700 listen4 = (struct sockaddr_in *) &listen_addr->src_addr; 701 ip4 = (struct sockaddr_in *) &addr->src_addr; 702 ip4->sin_family = listen4->sin_family; 703 ip4->sin_addr.s_addr = dst->ip4.addr; 704 ip4->sin_port = listen4->sin_port; 705 706 ip4 = (struct sockaddr_in *) &addr->dst_addr; 707 ip4->sin_family = listen4->sin_family; 708 ip4->sin_addr.s_addr = src->ip4.addr; 709 ip4->sin_port = port; 710 break; 711 case 6: 712 listen6 = (struct sockaddr_in6 *) &listen_addr->src_addr; 713 ip6 = (struct sockaddr_in6 *) &addr->src_addr; 714 ip6->sin6_family = listen6->sin6_family; 715 ip6->sin6_addr = dst->ip6; 716 ip6->sin6_port = listen6->sin6_port; 717 718 ip6 = (struct sockaddr_in6 *) &addr->dst_addr; 719 ip6->sin6_family = listen6->sin6_family; 720 ip6->sin6_addr = src->ip6; 721 ip6->sin6_port = port; 722 break; 723 default: 724 break; 725 } 726 } 727 728 static inline int cma_user_data_offset(enum rdma_port_space ps) 729 { 730 switch (ps) { 731 case RDMA_PS_SDP: 732 return 0; 733 default: 734 return sizeof(struct cma_hdr); 735 } 736 } 737 738 static void cma_cancel_route(struct rdma_id_private *id_priv) 739 { 740 switch (rdma_node_get_transport(id_priv->id.device->node_type)) { 741 case RDMA_TRANSPORT_IB: 742 if (id_priv->query) 743 ib_sa_cancel_query(id_priv->query_id, id_priv->query); 744 break; 745 default: 746 break; 747 } 748 } 749 750 static void cma_cancel_listens(struct rdma_id_private *id_priv) 751 { 752 struct rdma_id_private *dev_id_priv; 753 754 /* 755 * Remove from listen_any_list to prevent added devices from spawning 756 * additional listen requests. 757 */ 758 mutex_lock(&lock); 759 list_del(&id_priv->list); 760 761 while (!list_empty(&id_priv->listen_list)) { 762 dev_id_priv = list_entry(id_priv->listen_list.next, 763 struct rdma_id_private, listen_list); 764 /* sync with device removal to avoid duplicate destruction */ 765 list_del_init(&dev_id_priv->list); 766 list_del(&dev_id_priv->listen_list); 767 mutex_unlock(&lock); 768 769 rdma_destroy_id(&dev_id_priv->id); 770 mutex_lock(&lock); 771 } 772 mutex_unlock(&lock); 773 } 774 775 static void cma_cancel_operation(struct rdma_id_private *id_priv, 776 enum cma_state state) 777 { 778 switch (state) { 779 case CMA_ADDR_QUERY: 780 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr); 781 break; 782 case CMA_ROUTE_QUERY: 783 cma_cancel_route(id_priv); 784 break; 785 case CMA_LISTEN: 786 if (cma_any_addr((struct sockaddr *) &id_priv->id.route.addr.src_addr) 787 && !id_priv->cma_dev) 788 cma_cancel_listens(id_priv); 789 break; 790 default: 791 break; 792 } 793 } 794 795 static void cma_release_port(struct rdma_id_private *id_priv) 796 { 797 struct rdma_bind_list *bind_list = id_priv->bind_list; 798 799 if (!bind_list) 800 return; 801 802 mutex_lock(&lock); 803 hlist_del(&id_priv->node); 804 if (hlist_empty(&bind_list->owners)) { 805 idr_remove(bind_list->ps, bind_list->port); 806 kfree(bind_list); 807 } 808 mutex_unlock(&lock); 809 } 810 811 static void cma_leave_mc_groups(struct rdma_id_private *id_priv) 812 { 813 struct cma_multicast *mc; 814 815 while (!list_empty(&id_priv->mc_list)) { 816 mc = container_of(id_priv->mc_list.next, 817 struct cma_multicast, list); 818 list_del(&mc->list); 819 ib_sa_free_multicast(mc->multicast.ib); 820 kfree(mc); 821 } 822 } 823 824 void rdma_destroy_id(struct rdma_cm_id *id) 825 { 826 struct rdma_id_private *id_priv; 827 enum cma_state state; 828 829 id_priv = container_of(id, struct rdma_id_private, id); 830 state = cma_exch(id_priv, CMA_DESTROYING); 831 cma_cancel_operation(id_priv, state); 832 833 mutex_lock(&lock); 834 if (id_priv->cma_dev) { 835 mutex_unlock(&lock); 836 switch (rdma_node_get_transport(id->device->node_type)) { 837 case RDMA_TRANSPORT_IB: 838 if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib)) 839 ib_destroy_cm_id(id_priv->cm_id.ib); 840 break; 841 case RDMA_TRANSPORT_IWARP: 842 if (id_priv->cm_id.iw && !IS_ERR(id_priv->cm_id.iw)) 843 iw_destroy_cm_id(id_priv->cm_id.iw); 844 break; 845 default: 846 break; 847 } 848 cma_leave_mc_groups(id_priv); 849 mutex_lock(&lock); 850 cma_detach_from_dev(id_priv); 851 } 852 mutex_unlock(&lock); 853 854 cma_release_port(id_priv); 855 cma_deref_id(id_priv); 856 wait_for_completion(&id_priv->comp); 857 858 if (id_priv->internal_id) 859 cma_deref_id(id_priv->id.context); 860 861 kfree(id_priv->id.route.path_rec); 862 kfree(id_priv); 863 } 864 EXPORT_SYMBOL(rdma_destroy_id); 865 866 static int cma_rep_recv(struct rdma_id_private *id_priv) 867 { 868 int ret; 869 870 ret = cma_modify_qp_rtr(id_priv, NULL); 871 if (ret) 872 goto reject; 873 874 ret = cma_modify_qp_rts(id_priv, NULL); 875 if (ret) 876 goto reject; 877 878 ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0); 879 if (ret) 880 goto reject; 881 882 return 0; 883 reject: 884 cma_modify_qp_err(id_priv); 885 ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED, 886 NULL, 0, NULL, 0); 887 return ret; 888 } 889 890 static int cma_verify_rep(struct rdma_id_private *id_priv, void *data) 891 { 892 if (id_priv->id.ps == RDMA_PS_SDP && 893 sdp_get_majv(((struct sdp_hah *) data)->sdp_version) != 894 SDP_MAJ_VERSION) 895 return -EINVAL; 896 897 return 0; 898 } 899 900 static void cma_set_rep_event_data(struct rdma_cm_event *event, 901 struct ib_cm_rep_event_param *rep_data, 902 void *private_data) 903 { 904 event->param.conn.private_data = private_data; 905 event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE; 906 event->param.conn.responder_resources = rep_data->responder_resources; 907 event->param.conn.initiator_depth = rep_data->initiator_depth; 908 event->param.conn.flow_control = rep_data->flow_control; 909 event->param.conn.rnr_retry_count = rep_data->rnr_retry_count; 910 event->param.conn.srq = rep_data->srq; 911 event->param.conn.qp_num = rep_data->remote_qpn; 912 } 913 914 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event) 915 { 916 struct rdma_id_private *id_priv = cm_id->context; 917 struct rdma_cm_event event; 918 int ret = 0; 919 920 if ((ib_event->event != IB_CM_TIMEWAIT_EXIT && 921 cma_disable_callback(id_priv, CMA_CONNECT)) || 922 (ib_event->event == IB_CM_TIMEWAIT_EXIT && 923 cma_disable_callback(id_priv, CMA_DISCONNECT))) 924 return 0; 925 926 memset(&event, 0, sizeof event); 927 switch (ib_event->event) { 928 case IB_CM_REQ_ERROR: 929 case IB_CM_REP_ERROR: 930 event.event = RDMA_CM_EVENT_UNREACHABLE; 931 event.status = -ETIMEDOUT; 932 break; 933 case IB_CM_REP_RECEIVED: 934 event.status = cma_verify_rep(id_priv, ib_event->private_data); 935 if (event.status) 936 event.event = RDMA_CM_EVENT_CONNECT_ERROR; 937 else if (id_priv->id.qp && id_priv->id.ps != RDMA_PS_SDP) { 938 event.status = cma_rep_recv(id_priv); 939 event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR : 940 RDMA_CM_EVENT_ESTABLISHED; 941 } else 942 event.event = RDMA_CM_EVENT_CONNECT_RESPONSE; 943 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd, 944 ib_event->private_data); 945 break; 946 case IB_CM_RTU_RECEIVED: 947 case IB_CM_USER_ESTABLISHED: 948 event.event = RDMA_CM_EVENT_ESTABLISHED; 949 break; 950 case IB_CM_DREQ_ERROR: 951 event.status = -ETIMEDOUT; /* fall through */ 952 case IB_CM_DREQ_RECEIVED: 953 case IB_CM_DREP_RECEIVED: 954 if (!cma_comp_exch(id_priv, CMA_CONNECT, CMA_DISCONNECT)) 955 goto out; 956 event.event = RDMA_CM_EVENT_DISCONNECTED; 957 break; 958 case IB_CM_TIMEWAIT_EXIT: 959 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT; 960 break; 961 case IB_CM_MRA_RECEIVED: 962 /* ignore event */ 963 goto out; 964 case IB_CM_REJ_RECEIVED: 965 cma_modify_qp_err(id_priv); 966 event.status = ib_event->param.rej_rcvd.reason; 967 event.event = RDMA_CM_EVENT_REJECTED; 968 event.param.conn.private_data = ib_event->private_data; 969 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE; 970 break; 971 default: 972 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n", 973 ib_event->event); 974 goto out; 975 } 976 977 ret = id_priv->id.event_handler(&id_priv->id, &event); 978 if (ret) { 979 /* Destroy the CM ID by returning a non-zero value. */ 980 id_priv->cm_id.ib = NULL; 981 cma_exch(id_priv, CMA_DESTROYING); 982 mutex_unlock(&id_priv->handler_mutex); 983 rdma_destroy_id(&id_priv->id); 984 return ret; 985 } 986 out: 987 mutex_unlock(&id_priv->handler_mutex); 988 return ret; 989 } 990 991 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id, 992 struct ib_cm_event *ib_event) 993 { 994 struct rdma_id_private *id_priv; 995 struct rdma_cm_id *id; 996 struct rdma_route *rt; 997 union cma_ip_addr *src, *dst; 998 __be16 port; 999 u8 ip_ver; 1000 int ret; 1001 1002 if (cma_get_net_info(ib_event->private_data, listen_id->ps, 1003 &ip_ver, &port, &src, &dst)) 1004 goto err; 1005 1006 id = rdma_create_id(listen_id->event_handler, listen_id->context, 1007 listen_id->ps); 1008 if (IS_ERR(id)) 1009 goto err; 1010 1011 cma_save_net_info(&id->route.addr, &listen_id->route.addr, 1012 ip_ver, port, src, dst); 1013 1014 rt = &id->route; 1015 rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1; 1016 rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths, 1017 GFP_KERNEL); 1018 if (!rt->path_rec) 1019 goto destroy_id; 1020 1021 rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path; 1022 if (rt->num_paths == 2) 1023 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path; 1024 1025 if (cma_any_addr((struct sockaddr *) &rt->addr.src_addr)) { 1026 rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND; 1027 rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid); 1028 ib_addr_set_pkey(&rt->addr.dev_addr, rt->path_rec[0].pkey); 1029 } else { 1030 ret = rdma_translate_ip((struct sockaddr *) &rt->addr.src_addr, 1031 &rt->addr.dev_addr); 1032 if (ret) 1033 goto destroy_id; 1034 } 1035 rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid); 1036 1037 id_priv = container_of(id, struct rdma_id_private, id); 1038 id_priv->state = CMA_CONNECT; 1039 return id_priv; 1040 1041 destroy_id: 1042 rdma_destroy_id(id); 1043 err: 1044 return NULL; 1045 } 1046 1047 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id, 1048 struct ib_cm_event *ib_event) 1049 { 1050 struct rdma_id_private *id_priv; 1051 struct rdma_cm_id *id; 1052 union cma_ip_addr *src, *dst; 1053 __be16 port; 1054 u8 ip_ver; 1055 int ret; 1056 1057 id = rdma_create_id(listen_id->event_handler, listen_id->context, 1058 listen_id->ps); 1059 if (IS_ERR(id)) 1060 return NULL; 1061 1062 1063 if (cma_get_net_info(ib_event->private_data, listen_id->ps, 1064 &ip_ver, &port, &src, &dst)) 1065 goto err; 1066 1067 cma_save_net_info(&id->route.addr, &listen_id->route.addr, 1068 ip_ver, port, src, dst); 1069 1070 if (!cma_any_addr((struct sockaddr *) &id->route.addr.src_addr)) { 1071 ret = rdma_translate_ip((struct sockaddr *) &id->route.addr.src_addr, 1072 &id->route.addr.dev_addr); 1073 if (ret) 1074 goto err; 1075 } 1076 1077 id_priv = container_of(id, struct rdma_id_private, id); 1078 id_priv->state = CMA_CONNECT; 1079 return id_priv; 1080 err: 1081 rdma_destroy_id(id); 1082 return NULL; 1083 } 1084 1085 static void cma_set_req_event_data(struct rdma_cm_event *event, 1086 struct ib_cm_req_event_param *req_data, 1087 void *private_data, int offset) 1088 { 1089 event->param.conn.private_data = private_data + offset; 1090 event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset; 1091 event->param.conn.responder_resources = req_data->responder_resources; 1092 event->param.conn.initiator_depth = req_data->initiator_depth; 1093 event->param.conn.flow_control = req_data->flow_control; 1094 event->param.conn.retry_count = req_data->retry_count; 1095 event->param.conn.rnr_retry_count = req_data->rnr_retry_count; 1096 event->param.conn.srq = req_data->srq; 1097 event->param.conn.qp_num = req_data->remote_qpn; 1098 } 1099 1100 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event) 1101 { 1102 struct rdma_id_private *listen_id, *conn_id; 1103 struct rdma_cm_event event; 1104 int offset, ret; 1105 1106 listen_id = cm_id->context; 1107 if (cma_disable_callback(listen_id, CMA_LISTEN)) 1108 return -ECONNABORTED; 1109 1110 memset(&event, 0, sizeof event); 1111 offset = cma_user_data_offset(listen_id->id.ps); 1112 event.event = RDMA_CM_EVENT_CONNECT_REQUEST; 1113 if (cma_is_ud_ps(listen_id->id.ps)) { 1114 conn_id = cma_new_udp_id(&listen_id->id, ib_event); 1115 event.param.ud.private_data = ib_event->private_data + offset; 1116 event.param.ud.private_data_len = 1117 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset; 1118 } else { 1119 conn_id = cma_new_conn_id(&listen_id->id, ib_event); 1120 cma_set_req_event_data(&event, &ib_event->param.req_rcvd, 1121 ib_event->private_data, offset); 1122 } 1123 if (!conn_id) { 1124 ret = -ENOMEM; 1125 goto out; 1126 } 1127 1128 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING); 1129 mutex_lock(&lock); 1130 ret = cma_acquire_dev(conn_id); 1131 mutex_unlock(&lock); 1132 if (ret) 1133 goto release_conn_id; 1134 1135 conn_id->cm_id.ib = cm_id; 1136 cm_id->context = conn_id; 1137 cm_id->cm_handler = cma_ib_handler; 1138 1139 ret = conn_id->id.event_handler(&conn_id->id, &event); 1140 if (!ret) { 1141 /* 1142 * Acquire mutex to prevent user executing rdma_destroy_id() 1143 * while we're accessing the cm_id. 1144 */ 1145 mutex_lock(&lock); 1146 if (cma_comp(conn_id, CMA_CONNECT) && 1147 !cma_is_ud_ps(conn_id->id.ps)) 1148 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0); 1149 mutex_unlock(&lock); 1150 mutex_unlock(&conn_id->handler_mutex); 1151 goto out; 1152 } 1153 1154 /* Destroy the CM ID by returning a non-zero value. */ 1155 conn_id->cm_id.ib = NULL; 1156 1157 release_conn_id: 1158 cma_exch(conn_id, CMA_DESTROYING); 1159 mutex_unlock(&conn_id->handler_mutex); 1160 rdma_destroy_id(&conn_id->id); 1161 1162 out: 1163 mutex_unlock(&listen_id->handler_mutex); 1164 return ret; 1165 } 1166 1167 static __be64 cma_get_service_id(enum rdma_port_space ps, struct sockaddr *addr) 1168 { 1169 return cpu_to_be64(((u64)ps << 16) + be16_to_cpu(cma_port(addr))); 1170 } 1171 1172 static void cma_set_compare_data(enum rdma_port_space ps, struct sockaddr *addr, 1173 struct ib_cm_compare_data *compare) 1174 { 1175 struct cma_hdr *cma_data, *cma_mask; 1176 struct sdp_hh *sdp_data, *sdp_mask; 1177 __be32 ip4_addr; 1178 struct in6_addr ip6_addr; 1179 1180 memset(compare, 0, sizeof *compare); 1181 cma_data = (void *) compare->data; 1182 cma_mask = (void *) compare->mask; 1183 sdp_data = (void *) compare->data; 1184 sdp_mask = (void *) compare->mask; 1185 1186 switch (addr->sa_family) { 1187 case AF_INET: 1188 ip4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr; 1189 if (ps == RDMA_PS_SDP) { 1190 sdp_set_ip_ver(sdp_data, 4); 1191 sdp_set_ip_ver(sdp_mask, 0xF); 1192 sdp_data->dst_addr.ip4.addr = ip4_addr; 1193 sdp_mask->dst_addr.ip4.addr = htonl(~0); 1194 } else { 1195 cma_set_ip_ver(cma_data, 4); 1196 cma_set_ip_ver(cma_mask, 0xF); 1197 cma_data->dst_addr.ip4.addr = ip4_addr; 1198 cma_mask->dst_addr.ip4.addr = htonl(~0); 1199 } 1200 break; 1201 case AF_INET6: 1202 ip6_addr = ((struct sockaddr_in6 *) addr)->sin6_addr; 1203 if (ps == RDMA_PS_SDP) { 1204 sdp_set_ip_ver(sdp_data, 6); 1205 sdp_set_ip_ver(sdp_mask, 0xF); 1206 sdp_data->dst_addr.ip6 = ip6_addr; 1207 memset(&sdp_mask->dst_addr.ip6, 0xFF, 1208 sizeof sdp_mask->dst_addr.ip6); 1209 } else { 1210 cma_set_ip_ver(cma_data, 6); 1211 cma_set_ip_ver(cma_mask, 0xF); 1212 cma_data->dst_addr.ip6 = ip6_addr; 1213 memset(&cma_mask->dst_addr.ip6, 0xFF, 1214 sizeof cma_mask->dst_addr.ip6); 1215 } 1216 break; 1217 default: 1218 break; 1219 } 1220 } 1221 1222 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event) 1223 { 1224 struct rdma_id_private *id_priv = iw_id->context; 1225 struct rdma_cm_event event; 1226 struct sockaddr_in *sin; 1227 int ret = 0; 1228 1229 if (cma_disable_callback(id_priv, CMA_CONNECT)) 1230 return 0; 1231 1232 memset(&event, 0, sizeof event); 1233 switch (iw_event->event) { 1234 case IW_CM_EVENT_CLOSE: 1235 event.event = RDMA_CM_EVENT_DISCONNECTED; 1236 break; 1237 case IW_CM_EVENT_CONNECT_REPLY: 1238 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr; 1239 *sin = iw_event->local_addr; 1240 sin = (struct sockaddr_in *) &id_priv->id.route.addr.dst_addr; 1241 *sin = iw_event->remote_addr; 1242 switch (iw_event->status) { 1243 case 0: 1244 event.event = RDMA_CM_EVENT_ESTABLISHED; 1245 break; 1246 case -ECONNRESET: 1247 case -ECONNREFUSED: 1248 event.event = RDMA_CM_EVENT_REJECTED; 1249 break; 1250 case -ETIMEDOUT: 1251 event.event = RDMA_CM_EVENT_UNREACHABLE; 1252 break; 1253 default: 1254 event.event = RDMA_CM_EVENT_CONNECT_ERROR; 1255 break; 1256 } 1257 break; 1258 case IW_CM_EVENT_ESTABLISHED: 1259 event.event = RDMA_CM_EVENT_ESTABLISHED; 1260 break; 1261 default: 1262 BUG_ON(1); 1263 } 1264 1265 event.status = iw_event->status; 1266 event.param.conn.private_data = iw_event->private_data; 1267 event.param.conn.private_data_len = iw_event->private_data_len; 1268 ret = id_priv->id.event_handler(&id_priv->id, &event); 1269 if (ret) { 1270 /* Destroy the CM ID by returning a non-zero value. */ 1271 id_priv->cm_id.iw = NULL; 1272 cma_exch(id_priv, CMA_DESTROYING); 1273 mutex_unlock(&id_priv->handler_mutex); 1274 rdma_destroy_id(&id_priv->id); 1275 return ret; 1276 } 1277 1278 mutex_unlock(&id_priv->handler_mutex); 1279 return ret; 1280 } 1281 1282 static int iw_conn_req_handler(struct iw_cm_id *cm_id, 1283 struct iw_cm_event *iw_event) 1284 { 1285 struct rdma_cm_id *new_cm_id; 1286 struct rdma_id_private *listen_id, *conn_id; 1287 struct sockaddr_in *sin; 1288 struct net_device *dev = NULL; 1289 struct rdma_cm_event event; 1290 int ret; 1291 struct ib_device_attr attr; 1292 1293 listen_id = cm_id->context; 1294 if (cma_disable_callback(listen_id, CMA_LISTEN)) 1295 return -ECONNABORTED; 1296 1297 /* Create a new RDMA id for the new IW CM ID */ 1298 new_cm_id = rdma_create_id(listen_id->id.event_handler, 1299 listen_id->id.context, 1300 RDMA_PS_TCP); 1301 if (IS_ERR(new_cm_id)) { 1302 ret = -ENOMEM; 1303 goto out; 1304 } 1305 conn_id = container_of(new_cm_id, struct rdma_id_private, id); 1306 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING); 1307 conn_id->state = CMA_CONNECT; 1308 1309 dev = ip_dev_find(&init_net, iw_event->local_addr.sin_addr.s_addr); 1310 if (!dev) { 1311 ret = -EADDRNOTAVAIL; 1312 mutex_unlock(&conn_id->handler_mutex); 1313 rdma_destroy_id(new_cm_id); 1314 goto out; 1315 } 1316 ret = rdma_copy_addr(&conn_id->id.route.addr.dev_addr, dev, NULL); 1317 if (ret) { 1318 mutex_unlock(&conn_id->handler_mutex); 1319 rdma_destroy_id(new_cm_id); 1320 goto out; 1321 } 1322 1323 mutex_lock(&lock); 1324 ret = cma_acquire_dev(conn_id); 1325 mutex_unlock(&lock); 1326 if (ret) { 1327 mutex_unlock(&conn_id->handler_mutex); 1328 rdma_destroy_id(new_cm_id); 1329 goto out; 1330 } 1331 1332 conn_id->cm_id.iw = cm_id; 1333 cm_id->context = conn_id; 1334 cm_id->cm_handler = cma_iw_handler; 1335 1336 sin = (struct sockaddr_in *) &new_cm_id->route.addr.src_addr; 1337 *sin = iw_event->local_addr; 1338 sin = (struct sockaddr_in *) &new_cm_id->route.addr.dst_addr; 1339 *sin = iw_event->remote_addr; 1340 1341 ret = ib_query_device(conn_id->id.device, &attr); 1342 if (ret) { 1343 mutex_unlock(&conn_id->handler_mutex); 1344 rdma_destroy_id(new_cm_id); 1345 goto out; 1346 } 1347 1348 memset(&event, 0, sizeof event); 1349 event.event = RDMA_CM_EVENT_CONNECT_REQUEST; 1350 event.param.conn.private_data = iw_event->private_data; 1351 event.param.conn.private_data_len = iw_event->private_data_len; 1352 event.param.conn.initiator_depth = attr.max_qp_init_rd_atom; 1353 event.param.conn.responder_resources = attr.max_qp_rd_atom; 1354 ret = conn_id->id.event_handler(&conn_id->id, &event); 1355 if (ret) { 1356 /* User wants to destroy the CM ID */ 1357 conn_id->cm_id.iw = NULL; 1358 cma_exch(conn_id, CMA_DESTROYING); 1359 mutex_unlock(&conn_id->handler_mutex); 1360 rdma_destroy_id(&conn_id->id); 1361 goto out; 1362 } 1363 1364 mutex_unlock(&conn_id->handler_mutex); 1365 1366 out: 1367 if (dev) 1368 dev_put(dev); 1369 mutex_unlock(&listen_id->handler_mutex); 1370 return ret; 1371 } 1372 1373 static int cma_ib_listen(struct rdma_id_private *id_priv) 1374 { 1375 struct ib_cm_compare_data compare_data; 1376 struct sockaddr *addr; 1377 __be64 svc_id; 1378 int ret; 1379 1380 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_req_handler, 1381 id_priv); 1382 if (IS_ERR(id_priv->cm_id.ib)) 1383 return PTR_ERR(id_priv->cm_id.ib); 1384 1385 addr = (struct sockaddr *) &id_priv->id.route.addr.src_addr; 1386 svc_id = cma_get_service_id(id_priv->id.ps, addr); 1387 if (cma_any_addr(addr)) 1388 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, NULL); 1389 else { 1390 cma_set_compare_data(id_priv->id.ps, addr, &compare_data); 1391 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, &compare_data); 1392 } 1393 1394 if (ret) { 1395 ib_destroy_cm_id(id_priv->cm_id.ib); 1396 id_priv->cm_id.ib = NULL; 1397 } 1398 1399 return ret; 1400 } 1401 1402 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog) 1403 { 1404 int ret; 1405 struct sockaddr_in *sin; 1406 1407 id_priv->cm_id.iw = iw_create_cm_id(id_priv->id.device, 1408 iw_conn_req_handler, 1409 id_priv); 1410 if (IS_ERR(id_priv->cm_id.iw)) 1411 return PTR_ERR(id_priv->cm_id.iw); 1412 1413 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr; 1414 id_priv->cm_id.iw->local_addr = *sin; 1415 1416 ret = iw_cm_listen(id_priv->cm_id.iw, backlog); 1417 1418 if (ret) { 1419 iw_destroy_cm_id(id_priv->cm_id.iw); 1420 id_priv->cm_id.iw = NULL; 1421 } 1422 1423 return ret; 1424 } 1425 1426 static int cma_listen_handler(struct rdma_cm_id *id, 1427 struct rdma_cm_event *event) 1428 { 1429 struct rdma_id_private *id_priv = id->context; 1430 1431 id->context = id_priv->id.context; 1432 id->event_handler = id_priv->id.event_handler; 1433 return id_priv->id.event_handler(id, event); 1434 } 1435 1436 static void cma_listen_on_dev(struct rdma_id_private *id_priv, 1437 struct cma_device *cma_dev) 1438 { 1439 struct rdma_id_private *dev_id_priv; 1440 struct rdma_cm_id *id; 1441 int ret; 1442 1443 id = rdma_create_id(cma_listen_handler, id_priv, id_priv->id.ps); 1444 if (IS_ERR(id)) 1445 return; 1446 1447 dev_id_priv = container_of(id, struct rdma_id_private, id); 1448 1449 dev_id_priv->state = CMA_ADDR_BOUND; 1450 memcpy(&id->route.addr.src_addr, &id_priv->id.route.addr.src_addr, 1451 ip_addr_size((struct sockaddr *) &id_priv->id.route.addr.src_addr)); 1452 1453 cma_attach_to_dev(dev_id_priv, cma_dev); 1454 list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list); 1455 atomic_inc(&id_priv->refcount); 1456 dev_id_priv->internal_id = 1; 1457 1458 ret = rdma_listen(id, id_priv->backlog); 1459 if (ret) 1460 printk(KERN_WARNING "RDMA CMA: cma_listen_on_dev, error %d, " 1461 "listening on device %s\n", ret, cma_dev->device->name); 1462 } 1463 1464 static void cma_listen_on_all(struct rdma_id_private *id_priv) 1465 { 1466 struct cma_device *cma_dev; 1467 1468 mutex_lock(&lock); 1469 list_add_tail(&id_priv->list, &listen_any_list); 1470 list_for_each_entry(cma_dev, &dev_list, list) 1471 cma_listen_on_dev(id_priv, cma_dev); 1472 mutex_unlock(&lock); 1473 } 1474 1475 int rdma_listen(struct rdma_cm_id *id, int backlog) 1476 { 1477 struct rdma_id_private *id_priv; 1478 int ret; 1479 1480 id_priv = container_of(id, struct rdma_id_private, id); 1481 if (id_priv->state == CMA_IDLE) { 1482 ((struct sockaddr *) &id->route.addr.src_addr)->sa_family = AF_INET; 1483 ret = rdma_bind_addr(id, (struct sockaddr *) &id->route.addr.src_addr); 1484 if (ret) 1485 return ret; 1486 } 1487 1488 if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_LISTEN)) 1489 return -EINVAL; 1490 1491 id_priv->backlog = backlog; 1492 if (id->device) { 1493 switch (rdma_node_get_transport(id->device->node_type)) { 1494 case RDMA_TRANSPORT_IB: 1495 ret = cma_ib_listen(id_priv); 1496 if (ret) 1497 goto err; 1498 break; 1499 case RDMA_TRANSPORT_IWARP: 1500 ret = cma_iw_listen(id_priv, backlog); 1501 if (ret) 1502 goto err; 1503 break; 1504 default: 1505 ret = -ENOSYS; 1506 goto err; 1507 } 1508 } else 1509 cma_listen_on_all(id_priv); 1510 1511 return 0; 1512 err: 1513 id_priv->backlog = 0; 1514 cma_comp_exch(id_priv, CMA_LISTEN, CMA_ADDR_BOUND); 1515 return ret; 1516 } 1517 EXPORT_SYMBOL(rdma_listen); 1518 1519 void rdma_set_service_type(struct rdma_cm_id *id, int tos) 1520 { 1521 struct rdma_id_private *id_priv; 1522 1523 id_priv = container_of(id, struct rdma_id_private, id); 1524 id_priv->tos = (u8) tos; 1525 } 1526 EXPORT_SYMBOL(rdma_set_service_type); 1527 1528 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec, 1529 void *context) 1530 { 1531 struct cma_work *work = context; 1532 struct rdma_route *route; 1533 1534 route = &work->id->id.route; 1535 1536 if (!status) { 1537 route->num_paths = 1; 1538 *route->path_rec = *path_rec; 1539 } else { 1540 work->old_state = CMA_ROUTE_QUERY; 1541 work->new_state = CMA_ADDR_RESOLVED; 1542 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR; 1543 work->event.status = status; 1544 } 1545 1546 queue_work(cma_wq, &work->work); 1547 } 1548 1549 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms, 1550 struct cma_work *work) 1551 { 1552 struct rdma_addr *addr = &id_priv->id.route.addr; 1553 struct ib_sa_path_rec path_rec; 1554 ib_sa_comp_mask comp_mask; 1555 struct sockaddr_in6 *sin6; 1556 1557 memset(&path_rec, 0, sizeof path_rec); 1558 rdma_addr_get_sgid(&addr->dev_addr, &path_rec.sgid); 1559 rdma_addr_get_dgid(&addr->dev_addr, &path_rec.dgid); 1560 path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(&addr->dev_addr)); 1561 path_rec.numb_path = 1; 1562 path_rec.reversible = 1; 1563 path_rec.service_id = cma_get_service_id(id_priv->id.ps, 1564 (struct sockaddr *) &addr->dst_addr); 1565 1566 comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID | 1567 IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH | 1568 IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID; 1569 1570 if (addr->src_addr.ss_family == AF_INET) { 1571 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos); 1572 comp_mask |= IB_SA_PATH_REC_QOS_CLASS; 1573 } else { 1574 sin6 = (struct sockaddr_in6 *) &addr->src_addr; 1575 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20); 1576 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS; 1577 } 1578 1579 id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device, 1580 id_priv->id.port_num, &path_rec, 1581 comp_mask, timeout_ms, 1582 GFP_KERNEL, cma_query_handler, 1583 work, &id_priv->query); 1584 1585 return (id_priv->query_id < 0) ? id_priv->query_id : 0; 1586 } 1587 1588 static void cma_work_handler(struct work_struct *_work) 1589 { 1590 struct cma_work *work = container_of(_work, struct cma_work, work); 1591 struct rdma_id_private *id_priv = work->id; 1592 int destroy = 0; 1593 1594 mutex_lock(&id_priv->handler_mutex); 1595 if (!cma_comp_exch(id_priv, work->old_state, work->new_state)) 1596 goto out; 1597 1598 if (id_priv->id.event_handler(&id_priv->id, &work->event)) { 1599 cma_exch(id_priv, CMA_DESTROYING); 1600 destroy = 1; 1601 } 1602 out: 1603 mutex_unlock(&id_priv->handler_mutex); 1604 cma_deref_id(id_priv); 1605 if (destroy) 1606 rdma_destroy_id(&id_priv->id); 1607 kfree(work); 1608 } 1609 1610 static void cma_ndev_work_handler(struct work_struct *_work) 1611 { 1612 struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work); 1613 struct rdma_id_private *id_priv = work->id; 1614 int destroy = 0; 1615 1616 mutex_lock(&id_priv->handler_mutex); 1617 if (id_priv->state == CMA_DESTROYING || 1618 id_priv->state == CMA_DEVICE_REMOVAL) 1619 goto out; 1620 1621 if (id_priv->id.event_handler(&id_priv->id, &work->event)) { 1622 cma_exch(id_priv, CMA_DESTROYING); 1623 destroy = 1; 1624 } 1625 1626 out: 1627 mutex_unlock(&id_priv->handler_mutex); 1628 cma_deref_id(id_priv); 1629 if (destroy) 1630 rdma_destroy_id(&id_priv->id); 1631 kfree(work); 1632 } 1633 1634 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms) 1635 { 1636 struct rdma_route *route = &id_priv->id.route; 1637 struct cma_work *work; 1638 int ret; 1639 1640 work = kzalloc(sizeof *work, GFP_KERNEL); 1641 if (!work) 1642 return -ENOMEM; 1643 1644 work->id = id_priv; 1645 INIT_WORK(&work->work, cma_work_handler); 1646 work->old_state = CMA_ROUTE_QUERY; 1647 work->new_state = CMA_ROUTE_RESOLVED; 1648 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED; 1649 1650 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL); 1651 if (!route->path_rec) { 1652 ret = -ENOMEM; 1653 goto err1; 1654 } 1655 1656 ret = cma_query_ib_route(id_priv, timeout_ms, work); 1657 if (ret) 1658 goto err2; 1659 1660 return 0; 1661 err2: 1662 kfree(route->path_rec); 1663 route->path_rec = NULL; 1664 err1: 1665 kfree(work); 1666 return ret; 1667 } 1668 1669 int rdma_set_ib_paths(struct rdma_cm_id *id, 1670 struct ib_sa_path_rec *path_rec, int num_paths) 1671 { 1672 struct rdma_id_private *id_priv; 1673 int ret; 1674 1675 id_priv = container_of(id, struct rdma_id_private, id); 1676 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_RESOLVED)) 1677 return -EINVAL; 1678 1679 id->route.path_rec = kmemdup(path_rec, sizeof *path_rec * num_paths, 1680 GFP_KERNEL); 1681 if (!id->route.path_rec) { 1682 ret = -ENOMEM; 1683 goto err; 1684 } 1685 1686 id->route.num_paths = num_paths; 1687 return 0; 1688 err: 1689 cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_ADDR_RESOLVED); 1690 return ret; 1691 } 1692 EXPORT_SYMBOL(rdma_set_ib_paths); 1693 1694 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms) 1695 { 1696 struct cma_work *work; 1697 1698 work = kzalloc(sizeof *work, GFP_KERNEL); 1699 if (!work) 1700 return -ENOMEM; 1701 1702 work->id = id_priv; 1703 INIT_WORK(&work->work, cma_work_handler); 1704 work->old_state = CMA_ROUTE_QUERY; 1705 work->new_state = CMA_ROUTE_RESOLVED; 1706 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED; 1707 queue_work(cma_wq, &work->work); 1708 return 0; 1709 } 1710 1711 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms) 1712 { 1713 struct rdma_id_private *id_priv; 1714 int ret; 1715 1716 id_priv = container_of(id, struct rdma_id_private, id); 1717 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_QUERY)) 1718 return -EINVAL; 1719 1720 atomic_inc(&id_priv->refcount); 1721 switch (rdma_node_get_transport(id->device->node_type)) { 1722 case RDMA_TRANSPORT_IB: 1723 ret = cma_resolve_ib_route(id_priv, timeout_ms); 1724 break; 1725 case RDMA_TRANSPORT_IWARP: 1726 ret = cma_resolve_iw_route(id_priv, timeout_ms); 1727 break; 1728 default: 1729 ret = -ENOSYS; 1730 break; 1731 } 1732 if (ret) 1733 goto err; 1734 1735 return 0; 1736 err: 1737 cma_comp_exch(id_priv, CMA_ROUTE_QUERY, CMA_ADDR_RESOLVED); 1738 cma_deref_id(id_priv); 1739 return ret; 1740 } 1741 EXPORT_SYMBOL(rdma_resolve_route); 1742 1743 static int cma_bind_loopback(struct rdma_id_private *id_priv) 1744 { 1745 struct cma_device *cma_dev; 1746 struct ib_port_attr port_attr; 1747 union ib_gid gid; 1748 u16 pkey; 1749 int ret; 1750 u8 p; 1751 1752 mutex_lock(&lock); 1753 if (list_empty(&dev_list)) { 1754 ret = -ENODEV; 1755 goto out; 1756 } 1757 list_for_each_entry(cma_dev, &dev_list, list) 1758 for (p = 1; p <= cma_dev->device->phys_port_cnt; ++p) 1759 if (!ib_query_port(cma_dev->device, p, &port_attr) && 1760 port_attr.state == IB_PORT_ACTIVE) 1761 goto port_found; 1762 1763 p = 1; 1764 cma_dev = list_entry(dev_list.next, struct cma_device, list); 1765 1766 port_found: 1767 ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid); 1768 if (ret) 1769 goto out; 1770 1771 ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey); 1772 if (ret) 1773 goto out; 1774 1775 id_priv->id.route.addr.dev_addr.dev_type = 1776 (rdma_node_get_transport(cma_dev->device->node_type) == RDMA_TRANSPORT_IB) ? 1777 ARPHRD_INFINIBAND : ARPHRD_ETHER; 1778 1779 rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid); 1780 ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey); 1781 id_priv->id.port_num = p; 1782 cma_attach_to_dev(id_priv, cma_dev); 1783 out: 1784 mutex_unlock(&lock); 1785 return ret; 1786 } 1787 1788 static void addr_handler(int status, struct sockaddr *src_addr, 1789 struct rdma_dev_addr *dev_addr, void *context) 1790 { 1791 struct rdma_id_private *id_priv = context; 1792 struct rdma_cm_event event; 1793 1794 memset(&event, 0, sizeof event); 1795 mutex_lock(&id_priv->handler_mutex); 1796 1797 /* 1798 * Grab mutex to block rdma_destroy_id() from removing the device while 1799 * we're trying to acquire it. 1800 */ 1801 mutex_lock(&lock); 1802 if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_RESOLVED)) { 1803 mutex_unlock(&lock); 1804 goto out; 1805 } 1806 1807 if (!status && !id_priv->cma_dev) 1808 status = cma_acquire_dev(id_priv); 1809 mutex_unlock(&lock); 1810 1811 if (status) { 1812 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ADDR_BOUND)) 1813 goto out; 1814 event.event = RDMA_CM_EVENT_ADDR_ERROR; 1815 event.status = status; 1816 } else { 1817 memcpy(&id_priv->id.route.addr.src_addr, src_addr, 1818 ip_addr_size(src_addr)); 1819 event.event = RDMA_CM_EVENT_ADDR_RESOLVED; 1820 } 1821 1822 if (id_priv->id.event_handler(&id_priv->id, &event)) { 1823 cma_exch(id_priv, CMA_DESTROYING); 1824 mutex_unlock(&id_priv->handler_mutex); 1825 cma_deref_id(id_priv); 1826 rdma_destroy_id(&id_priv->id); 1827 return; 1828 } 1829 out: 1830 mutex_unlock(&id_priv->handler_mutex); 1831 cma_deref_id(id_priv); 1832 } 1833 1834 static int cma_resolve_loopback(struct rdma_id_private *id_priv) 1835 { 1836 struct cma_work *work; 1837 struct sockaddr *src, *dst; 1838 union ib_gid gid; 1839 int ret; 1840 1841 work = kzalloc(sizeof *work, GFP_KERNEL); 1842 if (!work) 1843 return -ENOMEM; 1844 1845 if (!id_priv->cma_dev) { 1846 ret = cma_bind_loopback(id_priv); 1847 if (ret) 1848 goto err; 1849 } 1850 1851 rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid); 1852 rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid); 1853 1854 src = (struct sockaddr *) &id_priv->id.route.addr.src_addr; 1855 if (cma_zero_addr(src)) { 1856 dst = (struct sockaddr *) &id_priv->id.route.addr.dst_addr; 1857 if ((src->sa_family = dst->sa_family) == AF_INET) { 1858 ((struct sockaddr_in *) src)->sin_addr.s_addr = 1859 ((struct sockaddr_in *) dst)->sin_addr.s_addr; 1860 } else { 1861 ipv6_addr_copy(&((struct sockaddr_in6 *) src)->sin6_addr, 1862 &((struct sockaddr_in6 *) dst)->sin6_addr); 1863 } 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 src_addr = (struct sockaddr *) &id->route.addr.src_addr; 1883 if ((src_addr->sa_family = dst_addr->sa_family) == AF_INET6) { 1884 ((struct sockaddr_in6 *) src_addr)->sin6_scope_id = 1885 ((struct sockaddr_in6 *) dst_addr)->sin6_scope_id; 1886 } 1887 } 1888 return rdma_bind_addr(id, src_addr); 1889 } 1890 1891 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr, 1892 struct sockaddr *dst_addr, int timeout_ms) 1893 { 1894 struct rdma_id_private *id_priv; 1895 int ret; 1896 1897 id_priv = container_of(id, struct rdma_id_private, id); 1898 if (id_priv->state == CMA_IDLE) { 1899 ret = cma_bind_addr(id, src_addr, dst_addr); 1900 if (ret) 1901 return ret; 1902 } 1903 1904 if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_ADDR_QUERY)) 1905 return -EINVAL; 1906 1907 atomic_inc(&id_priv->refcount); 1908 memcpy(&id->route.addr.dst_addr, dst_addr, ip_addr_size(dst_addr)); 1909 if (cma_any_addr(dst_addr)) 1910 ret = cma_resolve_loopback(id_priv); 1911 else 1912 ret = rdma_resolve_ip(&addr_client, (struct sockaddr *) &id->route.addr.src_addr, 1913 dst_addr, &id->route.addr.dev_addr, 1914 timeout_ms, addr_handler, id_priv); 1915 if (ret) 1916 goto err; 1917 1918 return 0; 1919 err: 1920 cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_BOUND); 1921 cma_deref_id(id_priv); 1922 return ret; 1923 } 1924 EXPORT_SYMBOL(rdma_resolve_addr); 1925 1926 static void cma_bind_port(struct rdma_bind_list *bind_list, 1927 struct rdma_id_private *id_priv) 1928 { 1929 struct sockaddr_in *sin; 1930 1931 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr; 1932 sin->sin_port = htons(bind_list->port); 1933 id_priv->bind_list = bind_list; 1934 hlist_add_head(&id_priv->node, &bind_list->owners); 1935 } 1936 1937 static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv, 1938 unsigned short snum) 1939 { 1940 struct rdma_bind_list *bind_list; 1941 int port, ret; 1942 1943 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL); 1944 if (!bind_list) 1945 return -ENOMEM; 1946 1947 do { 1948 ret = idr_get_new_above(ps, bind_list, snum, &port); 1949 } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL)); 1950 1951 if (ret) 1952 goto err1; 1953 1954 if (port != snum) { 1955 ret = -EADDRNOTAVAIL; 1956 goto err2; 1957 } 1958 1959 bind_list->ps = ps; 1960 bind_list->port = (unsigned short) port; 1961 cma_bind_port(bind_list, id_priv); 1962 return 0; 1963 err2: 1964 idr_remove(ps, port); 1965 err1: 1966 kfree(bind_list); 1967 return ret; 1968 } 1969 1970 static int cma_alloc_any_port(struct idr *ps, struct rdma_id_private *id_priv) 1971 { 1972 static unsigned int last_used_port; 1973 int low, high, remaining; 1974 unsigned int rover; 1975 1976 inet_get_local_port_range(&low, &high); 1977 remaining = (high - low) + 1; 1978 rover = net_random() % remaining + low; 1979 retry: 1980 if (last_used_port != rover && 1981 !idr_find(ps, (unsigned short) rover)) { 1982 int ret = cma_alloc_port(ps, id_priv, rover); 1983 /* 1984 * Remember previously used port number in order to avoid 1985 * re-using same port immediately after it is closed. 1986 */ 1987 if (!ret) 1988 last_used_port = rover; 1989 if (ret != -EADDRNOTAVAIL) 1990 return ret; 1991 } 1992 if (--remaining) { 1993 rover++; 1994 if ((rover < low) || (rover > high)) 1995 rover = low; 1996 goto retry; 1997 } 1998 return -EADDRNOTAVAIL; 1999 } 2000 2001 static int cma_use_port(struct idr *ps, struct rdma_id_private *id_priv) 2002 { 2003 struct rdma_id_private *cur_id; 2004 struct sockaddr_in *sin, *cur_sin; 2005 struct rdma_bind_list *bind_list; 2006 struct hlist_node *node; 2007 unsigned short snum; 2008 2009 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr; 2010 snum = ntohs(sin->sin_port); 2011 if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 2012 return -EACCES; 2013 2014 bind_list = idr_find(ps, snum); 2015 if (!bind_list) 2016 return cma_alloc_port(ps, id_priv, snum); 2017 2018 /* 2019 * We don't support binding to any address if anyone is bound to 2020 * a specific address on the same port. 2021 */ 2022 if (cma_any_addr((struct sockaddr *) &id_priv->id.route.addr.src_addr)) 2023 return -EADDRNOTAVAIL; 2024 2025 hlist_for_each_entry(cur_id, node, &bind_list->owners, node) { 2026 if (cma_any_addr((struct sockaddr *) &cur_id->id.route.addr.src_addr)) 2027 return -EADDRNOTAVAIL; 2028 2029 cur_sin = (struct sockaddr_in *) &cur_id->id.route.addr.src_addr; 2030 if (sin->sin_addr.s_addr == cur_sin->sin_addr.s_addr) 2031 return -EADDRINUSE; 2032 } 2033 2034 cma_bind_port(bind_list, id_priv); 2035 return 0; 2036 } 2037 2038 static int cma_get_port(struct rdma_id_private *id_priv) 2039 { 2040 struct idr *ps; 2041 int ret; 2042 2043 switch (id_priv->id.ps) { 2044 case RDMA_PS_SDP: 2045 ps = &sdp_ps; 2046 break; 2047 case RDMA_PS_TCP: 2048 ps = &tcp_ps; 2049 break; 2050 case RDMA_PS_UDP: 2051 ps = &udp_ps; 2052 break; 2053 case RDMA_PS_IPOIB: 2054 ps = &ipoib_ps; 2055 break; 2056 default: 2057 return -EPROTONOSUPPORT; 2058 } 2059 2060 mutex_lock(&lock); 2061 if (cma_any_port((struct sockaddr *) &id_priv->id.route.addr.src_addr)) 2062 ret = cma_alloc_any_port(ps, id_priv); 2063 else 2064 ret = cma_use_port(ps, id_priv); 2065 mutex_unlock(&lock); 2066 2067 return ret; 2068 } 2069 2070 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr, 2071 struct sockaddr *addr) 2072 { 2073 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2074 struct sockaddr_in6 *sin6; 2075 2076 if (addr->sa_family != AF_INET6) 2077 return 0; 2078 2079 sin6 = (struct sockaddr_in6 *) addr; 2080 if ((ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) && 2081 !sin6->sin6_scope_id) 2082 return -EINVAL; 2083 2084 dev_addr->bound_dev_if = sin6->sin6_scope_id; 2085 #endif 2086 return 0; 2087 } 2088 2089 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr) 2090 { 2091 struct rdma_id_private *id_priv; 2092 int ret; 2093 2094 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6) 2095 return -EAFNOSUPPORT; 2096 2097 id_priv = container_of(id, struct rdma_id_private, id); 2098 if (!cma_comp_exch(id_priv, CMA_IDLE, CMA_ADDR_BOUND)) 2099 return -EINVAL; 2100 2101 ret = cma_check_linklocal(&id->route.addr.dev_addr, addr); 2102 if (ret) 2103 goto err1; 2104 2105 if (!cma_any_addr(addr)) { 2106 ret = rdma_translate_ip(addr, &id->route.addr.dev_addr); 2107 if (ret) 2108 goto err1; 2109 2110 mutex_lock(&lock); 2111 ret = cma_acquire_dev(id_priv); 2112 mutex_unlock(&lock); 2113 if (ret) 2114 goto err1; 2115 } 2116 2117 memcpy(&id->route.addr.src_addr, addr, ip_addr_size(addr)); 2118 ret = cma_get_port(id_priv); 2119 if (ret) 2120 goto err2; 2121 2122 return 0; 2123 err2: 2124 if (id_priv->cma_dev) { 2125 mutex_lock(&lock); 2126 cma_detach_from_dev(id_priv); 2127 mutex_unlock(&lock); 2128 } 2129 err1: 2130 cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_IDLE); 2131 return ret; 2132 } 2133 EXPORT_SYMBOL(rdma_bind_addr); 2134 2135 static int cma_format_hdr(void *hdr, enum rdma_port_space ps, 2136 struct rdma_route *route) 2137 { 2138 struct cma_hdr *cma_hdr; 2139 struct sdp_hh *sdp_hdr; 2140 2141 if (route->addr.src_addr.ss_family == AF_INET) { 2142 struct sockaddr_in *src4, *dst4; 2143 2144 src4 = (struct sockaddr_in *) &route->addr.src_addr; 2145 dst4 = (struct sockaddr_in *) &route->addr.dst_addr; 2146 2147 switch (ps) { 2148 case RDMA_PS_SDP: 2149 sdp_hdr = hdr; 2150 if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION) 2151 return -EINVAL; 2152 sdp_set_ip_ver(sdp_hdr, 4); 2153 sdp_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr; 2154 sdp_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr; 2155 sdp_hdr->port = src4->sin_port; 2156 break; 2157 default: 2158 cma_hdr = hdr; 2159 cma_hdr->cma_version = CMA_VERSION; 2160 cma_set_ip_ver(cma_hdr, 4); 2161 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr; 2162 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr; 2163 cma_hdr->port = src4->sin_port; 2164 break; 2165 } 2166 } else { 2167 struct sockaddr_in6 *src6, *dst6; 2168 2169 src6 = (struct sockaddr_in6 *) &route->addr.src_addr; 2170 dst6 = (struct sockaddr_in6 *) &route->addr.dst_addr; 2171 2172 switch (ps) { 2173 case RDMA_PS_SDP: 2174 sdp_hdr = hdr; 2175 if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION) 2176 return -EINVAL; 2177 sdp_set_ip_ver(sdp_hdr, 6); 2178 sdp_hdr->src_addr.ip6 = src6->sin6_addr; 2179 sdp_hdr->dst_addr.ip6 = dst6->sin6_addr; 2180 sdp_hdr->port = src6->sin6_port; 2181 break; 2182 default: 2183 cma_hdr = hdr; 2184 cma_hdr->cma_version = CMA_VERSION; 2185 cma_set_ip_ver(cma_hdr, 6); 2186 cma_hdr->src_addr.ip6 = src6->sin6_addr; 2187 cma_hdr->dst_addr.ip6 = dst6->sin6_addr; 2188 cma_hdr->port = src6->sin6_port; 2189 break; 2190 } 2191 } 2192 return 0; 2193 } 2194 2195 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id, 2196 struct ib_cm_event *ib_event) 2197 { 2198 struct rdma_id_private *id_priv = cm_id->context; 2199 struct rdma_cm_event event; 2200 struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd; 2201 int ret = 0; 2202 2203 if (cma_disable_callback(id_priv, CMA_CONNECT)) 2204 return 0; 2205 2206 memset(&event, 0, sizeof event); 2207 switch (ib_event->event) { 2208 case IB_CM_SIDR_REQ_ERROR: 2209 event.event = RDMA_CM_EVENT_UNREACHABLE; 2210 event.status = -ETIMEDOUT; 2211 break; 2212 case IB_CM_SIDR_REP_RECEIVED: 2213 event.param.ud.private_data = ib_event->private_data; 2214 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE; 2215 if (rep->status != IB_SIDR_SUCCESS) { 2216 event.event = RDMA_CM_EVENT_UNREACHABLE; 2217 event.status = ib_event->param.sidr_rep_rcvd.status; 2218 break; 2219 } 2220 ret = cma_set_qkey(id_priv); 2221 if (ret) { 2222 event.event = RDMA_CM_EVENT_ADDR_ERROR; 2223 event.status = -EINVAL; 2224 break; 2225 } 2226 if (id_priv->qkey != rep->qkey) { 2227 event.event = RDMA_CM_EVENT_UNREACHABLE; 2228 event.status = -EINVAL; 2229 break; 2230 } 2231 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num, 2232 id_priv->id.route.path_rec, 2233 &event.param.ud.ah_attr); 2234 event.param.ud.qp_num = rep->qpn; 2235 event.param.ud.qkey = rep->qkey; 2236 event.event = RDMA_CM_EVENT_ESTABLISHED; 2237 event.status = 0; 2238 break; 2239 default: 2240 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n", 2241 ib_event->event); 2242 goto out; 2243 } 2244 2245 ret = id_priv->id.event_handler(&id_priv->id, &event); 2246 if (ret) { 2247 /* Destroy the CM ID by returning a non-zero value. */ 2248 id_priv->cm_id.ib = NULL; 2249 cma_exch(id_priv, CMA_DESTROYING); 2250 mutex_unlock(&id_priv->handler_mutex); 2251 rdma_destroy_id(&id_priv->id); 2252 return ret; 2253 } 2254 out: 2255 mutex_unlock(&id_priv->handler_mutex); 2256 return ret; 2257 } 2258 2259 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv, 2260 struct rdma_conn_param *conn_param) 2261 { 2262 struct ib_cm_sidr_req_param req; 2263 struct rdma_route *route; 2264 int ret; 2265 2266 req.private_data_len = sizeof(struct cma_hdr) + 2267 conn_param->private_data_len; 2268 req.private_data = kzalloc(req.private_data_len, GFP_ATOMIC); 2269 if (!req.private_data) 2270 return -ENOMEM; 2271 2272 if (conn_param->private_data && conn_param->private_data_len) 2273 memcpy((void *) req.private_data + sizeof(struct cma_hdr), 2274 conn_param->private_data, conn_param->private_data_len); 2275 2276 route = &id_priv->id.route; 2277 ret = cma_format_hdr((void *) req.private_data, id_priv->id.ps, route); 2278 if (ret) 2279 goto out; 2280 2281 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, 2282 cma_sidr_rep_handler, id_priv); 2283 if (IS_ERR(id_priv->cm_id.ib)) { 2284 ret = PTR_ERR(id_priv->cm_id.ib); 2285 goto out; 2286 } 2287 2288 req.path = route->path_rec; 2289 req.service_id = cma_get_service_id(id_priv->id.ps, 2290 (struct sockaddr *) &route->addr.dst_addr); 2291 req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8); 2292 req.max_cm_retries = CMA_MAX_CM_RETRIES; 2293 2294 ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req); 2295 if (ret) { 2296 ib_destroy_cm_id(id_priv->cm_id.ib); 2297 id_priv->cm_id.ib = NULL; 2298 } 2299 out: 2300 kfree(req.private_data); 2301 return ret; 2302 } 2303 2304 static int cma_connect_ib(struct rdma_id_private *id_priv, 2305 struct rdma_conn_param *conn_param) 2306 { 2307 struct ib_cm_req_param req; 2308 struct rdma_route *route; 2309 void *private_data; 2310 int offset, ret; 2311 2312 memset(&req, 0, sizeof req); 2313 offset = cma_user_data_offset(id_priv->id.ps); 2314 req.private_data_len = offset + conn_param->private_data_len; 2315 private_data = kzalloc(req.private_data_len, GFP_ATOMIC); 2316 if (!private_data) 2317 return -ENOMEM; 2318 2319 if (conn_param->private_data && conn_param->private_data_len) 2320 memcpy(private_data + offset, conn_param->private_data, 2321 conn_param->private_data_len); 2322 2323 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_ib_handler, 2324 id_priv); 2325 if (IS_ERR(id_priv->cm_id.ib)) { 2326 ret = PTR_ERR(id_priv->cm_id.ib); 2327 goto out; 2328 } 2329 2330 route = &id_priv->id.route; 2331 ret = cma_format_hdr(private_data, id_priv->id.ps, route); 2332 if (ret) 2333 goto out; 2334 req.private_data = private_data; 2335 2336 req.primary_path = &route->path_rec[0]; 2337 if (route->num_paths == 2) 2338 req.alternate_path = &route->path_rec[1]; 2339 2340 req.service_id = cma_get_service_id(id_priv->id.ps, 2341 (struct sockaddr *) &route->addr.dst_addr); 2342 req.qp_num = id_priv->qp_num; 2343 req.qp_type = IB_QPT_RC; 2344 req.starting_psn = id_priv->seq_num; 2345 req.responder_resources = conn_param->responder_resources; 2346 req.initiator_depth = conn_param->initiator_depth; 2347 req.flow_control = conn_param->flow_control; 2348 req.retry_count = conn_param->retry_count; 2349 req.rnr_retry_count = conn_param->rnr_retry_count; 2350 req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT; 2351 req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT; 2352 req.max_cm_retries = CMA_MAX_CM_RETRIES; 2353 req.srq = id_priv->srq ? 1 : 0; 2354 2355 ret = ib_send_cm_req(id_priv->cm_id.ib, &req); 2356 out: 2357 if (ret && !IS_ERR(id_priv->cm_id.ib)) { 2358 ib_destroy_cm_id(id_priv->cm_id.ib); 2359 id_priv->cm_id.ib = NULL; 2360 } 2361 2362 kfree(private_data); 2363 return ret; 2364 } 2365 2366 static int cma_connect_iw(struct rdma_id_private *id_priv, 2367 struct rdma_conn_param *conn_param) 2368 { 2369 struct iw_cm_id *cm_id; 2370 struct sockaddr_in* sin; 2371 int ret; 2372 struct iw_cm_conn_param iw_param; 2373 2374 cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv); 2375 if (IS_ERR(cm_id)) { 2376 ret = PTR_ERR(cm_id); 2377 goto out; 2378 } 2379 2380 id_priv->cm_id.iw = cm_id; 2381 2382 sin = (struct sockaddr_in*) &id_priv->id.route.addr.src_addr; 2383 cm_id->local_addr = *sin; 2384 2385 sin = (struct sockaddr_in*) &id_priv->id.route.addr.dst_addr; 2386 cm_id->remote_addr = *sin; 2387 2388 ret = cma_modify_qp_rtr(id_priv, conn_param); 2389 if (ret) 2390 goto out; 2391 2392 iw_param.ord = conn_param->initiator_depth; 2393 iw_param.ird = conn_param->responder_resources; 2394 iw_param.private_data = conn_param->private_data; 2395 iw_param.private_data_len = conn_param->private_data_len; 2396 if (id_priv->id.qp) 2397 iw_param.qpn = id_priv->qp_num; 2398 else 2399 iw_param.qpn = conn_param->qp_num; 2400 ret = iw_cm_connect(cm_id, &iw_param); 2401 out: 2402 if (ret && !IS_ERR(cm_id)) { 2403 iw_destroy_cm_id(cm_id); 2404 id_priv->cm_id.iw = NULL; 2405 } 2406 return ret; 2407 } 2408 2409 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param) 2410 { 2411 struct rdma_id_private *id_priv; 2412 int ret; 2413 2414 id_priv = container_of(id, struct rdma_id_private, id); 2415 if (!cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_CONNECT)) 2416 return -EINVAL; 2417 2418 if (!id->qp) { 2419 id_priv->qp_num = conn_param->qp_num; 2420 id_priv->srq = conn_param->srq; 2421 } 2422 2423 switch (rdma_node_get_transport(id->device->node_type)) { 2424 case RDMA_TRANSPORT_IB: 2425 if (cma_is_ud_ps(id->ps)) 2426 ret = cma_resolve_ib_udp(id_priv, conn_param); 2427 else 2428 ret = cma_connect_ib(id_priv, conn_param); 2429 break; 2430 case RDMA_TRANSPORT_IWARP: 2431 ret = cma_connect_iw(id_priv, conn_param); 2432 break; 2433 default: 2434 ret = -ENOSYS; 2435 break; 2436 } 2437 if (ret) 2438 goto err; 2439 2440 return 0; 2441 err: 2442 cma_comp_exch(id_priv, CMA_CONNECT, CMA_ROUTE_RESOLVED); 2443 return ret; 2444 } 2445 EXPORT_SYMBOL(rdma_connect); 2446 2447 static int cma_accept_ib(struct rdma_id_private *id_priv, 2448 struct rdma_conn_param *conn_param) 2449 { 2450 struct ib_cm_rep_param rep; 2451 int ret; 2452 2453 ret = cma_modify_qp_rtr(id_priv, conn_param); 2454 if (ret) 2455 goto out; 2456 2457 ret = cma_modify_qp_rts(id_priv, conn_param); 2458 if (ret) 2459 goto out; 2460 2461 memset(&rep, 0, sizeof rep); 2462 rep.qp_num = id_priv->qp_num; 2463 rep.starting_psn = id_priv->seq_num; 2464 rep.private_data = conn_param->private_data; 2465 rep.private_data_len = conn_param->private_data_len; 2466 rep.responder_resources = conn_param->responder_resources; 2467 rep.initiator_depth = conn_param->initiator_depth; 2468 rep.failover_accepted = 0; 2469 rep.flow_control = conn_param->flow_control; 2470 rep.rnr_retry_count = conn_param->rnr_retry_count; 2471 rep.srq = id_priv->srq ? 1 : 0; 2472 2473 ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep); 2474 out: 2475 return ret; 2476 } 2477 2478 static int cma_accept_iw(struct rdma_id_private *id_priv, 2479 struct rdma_conn_param *conn_param) 2480 { 2481 struct iw_cm_conn_param iw_param; 2482 int ret; 2483 2484 ret = cma_modify_qp_rtr(id_priv, conn_param); 2485 if (ret) 2486 return ret; 2487 2488 iw_param.ord = conn_param->initiator_depth; 2489 iw_param.ird = conn_param->responder_resources; 2490 iw_param.private_data = conn_param->private_data; 2491 iw_param.private_data_len = conn_param->private_data_len; 2492 if (id_priv->id.qp) { 2493 iw_param.qpn = id_priv->qp_num; 2494 } else 2495 iw_param.qpn = conn_param->qp_num; 2496 2497 return iw_cm_accept(id_priv->cm_id.iw, &iw_param); 2498 } 2499 2500 static int cma_send_sidr_rep(struct rdma_id_private *id_priv, 2501 enum ib_cm_sidr_status status, 2502 const void *private_data, int private_data_len) 2503 { 2504 struct ib_cm_sidr_rep_param rep; 2505 int ret; 2506 2507 memset(&rep, 0, sizeof rep); 2508 rep.status = status; 2509 if (status == IB_SIDR_SUCCESS) { 2510 ret = cma_set_qkey(id_priv); 2511 if (ret) 2512 return ret; 2513 rep.qp_num = id_priv->qp_num; 2514 rep.qkey = id_priv->qkey; 2515 } 2516 rep.private_data = private_data; 2517 rep.private_data_len = private_data_len; 2518 2519 return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep); 2520 } 2521 2522 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param) 2523 { 2524 struct rdma_id_private *id_priv; 2525 int ret; 2526 2527 id_priv = container_of(id, struct rdma_id_private, id); 2528 if (!cma_comp(id_priv, CMA_CONNECT)) 2529 return -EINVAL; 2530 2531 if (!id->qp && conn_param) { 2532 id_priv->qp_num = conn_param->qp_num; 2533 id_priv->srq = conn_param->srq; 2534 } 2535 2536 switch (rdma_node_get_transport(id->device->node_type)) { 2537 case RDMA_TRANSPORT_IB: 2538 if (cma_is_ud_ps(id->ps)) 2539 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS, 2540 conn_param->private_data, 2541 conn_param->private_data_len); 2542 else if (conn_param) 2543 ret = cma_accept_ib(id_priv, conn_param); 2544 else 2545 ret = cma_rep_recv(id_priv); 2546 break; 2547 case RDMA_TRANSPORT_IWARP: 2548 ret = cma_accept_iw(id_priv, conn_param); 2549 break; 2550 default: 2551 ret = -ENOSYS; 2552 break; 2553 } 2554 2555 if (ret) 2556 goto reject; 2557 2558 return 0; 2559 reject: 2560 cma_modify_qp_err(id_priv); 2561 rdma_reject(id, NULL, 0); 2562 return ret; 2563 } 2564 EXPORT_SYMBOL(rdma_accept); 2565 2566 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event) 2567 { 2568 struct rdma_id_private *id_priv; 2569 int ret; 2570 2571 id_priv = container_of(id, struct rdma_id_private, id); 2572 if (!cma_has_cm_dev(id_priv)) 2573 return -EINVAL; 2574 2575 switch (id->device->node_type) { 2576 case RDMA_NODE_IB_CA: 2577 ret = ib_cm_notify(id_priv->cm_id.ib, event); 2578 break; 2579 default: 2580 ret = 0; 2581 break; 2582 } 2583 return ret; 2584 } 2585 EXPORT_SYMBOL(rdma_notify); 2586 2587 int rdma_reject(struct rdma_cm_id *id, const void *private_data, 2588 u8 private_data_len) 2589 { 2590 struct rdma_id_private *id_priv; 2591 int ret; 2592 2593 id_priv = container_of(id, struct rdma_id_private, id); 2594 if (!cma_has_cm_dev(id_priv)) 2595 return -EINVAL; 2596 2597 switch (rdma_node_get_transport(id->device->node_type)) { 2598 case RDMA_TRANSPORT_IB: 2599 if (cma_is_ud_ps(id->ps)) 2600 ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 2601 private_data, private_data_len); 2602 else 2603 ret = ib_send_cm_rej(id_priv->cm_id.ib, 2604 IB_CM_REJ_CONSUMER_DEFINED, NULL, 2605 0, private_data, private_data_len); 2606 break; 2607 case RDMA_TRANSPORT_IWARP: 2608 ret = iw_cm_reject(id_priv->cm_id.iw, 2609 private_data, private_data_len); 2610 break; 2611 default: 2612 ret = -ENOSYS; 2613 break; 2614 } 2615 return ret; 2616 } 2617 EXPORT_SYMBOL(rdma_reject); 2618 2619 int rdma_disconnect(struct rdma_cm_id *id) 2620 { 2621 struct rdma_id_private *id_priv; 2622 int ret; 2623 2624 id_priv = container_of(id, struct rdma_id_private, id); 2625 if (!cma_has_cm_dev(id_priv)) 2626 return -EINVAL; 2627 2628 switch (rdma_node_get_transport(id->device->node_type)) { 2629 case RDMA_TRANSPORT_IB: 2630 ret = cma_modify_qp_err(id_priv); 2631 if (ret) 2632 goto out; 2633 /* Initiate or respond to a disconnect. */ 2634 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0)) 2635 ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0); 2636 break; 2637 case RDMA_TRANSPORT_IWARP: 2638 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0); 2639 break; 2640 default: 2641 ret = -EINVAL; 2642 break; 2643 } 2644 out: 2645 return ret; 2646 } 2647 EXPORT_SYMBOL(rdma_disconnect); 2648 2649 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast) 2650 { 2651 struct rdma_id_private *id_priv; 2652 struct cma_multicast *mc = multicast->context; 2653 struct rdma_cm_event event; 2654 int ret; 2655 2656 id_priv = mc->id_priv; 2657 if (cma_disable_callback(id_priv, CMA_ADDR_BOUND) && 2658 cma_disable_callback(id_priv, CMA_ADDR_RESOLVED)) 2659 return 0; 2660 2661 mutex_lock(&id_priv->qp_mutex); 2662 if (!status && id_priv->id.qp) 2663 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid, 2664 multicast->rec.mlid); 2665 mutex_unlock(&id_priv->qp_mutex); 2666 2667 memset(&event, 0, sizeof event); 2668 event.status = status; 2669 event.param.ud.private_data = mc->context; 2670 if (!status) { 2671 event.event = RDMA_CM_EVENT_MULTICAST_JOIN; 2672 ib_init_ah_from_mcmember(id_priv->id.device, 2673 id_priv->id.port_num, &multicast->rec, 2674 &event.param.ud.ah_attr); 2675 event.param.ud.qp_num = 0xFFFFFF; 2676 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey); 2677 } else 2678 event.event = RDMA_CM_EVENT_MULTICAST_ERROR; 2679 2680 ret = id_priv->id.event_handler(&id_priv->id, &event); 2681 if (ret) { 2682 cma_exch(id_priv, CMA_DESTROYING); 2683 mutex_unlock(&id_priv->handler_mutex); 2684 rdma_destroy_id(&id_priv->id); 2685 return 0; 2686 } 2687 2688 mutex_unlock(&id_priv->handler_mutex); 2689 return 0; 2690 } 2691 2692 static void cma_set_mgid(struct rdma_id_private *id_priv, 2693 struct sockaddr *addr, union ib_gid *mgid) 2694 { 2695 unsigned char mc_map[MAX_ADDR_LEN]; 2696 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr; 2697 struct sockaddr_in *sin = (struct sockaddr_in *) addr; 2698 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr; 2699 2700 if (cma_any_addr(addr)) { 2701 memset(mgid, 0, sizeof *mgid); 2702 } else if ((addr->sa_family == AF_INET6) && 2703 ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) == 2704 0xFF10A01B)) { 2705 /* IPv6 address is an SA assigned MGID. */ 2706 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid); 2707 } else if ((addr->sa_family == AF_INET6)) { 2708 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map); 2709 if (id_priv->id.ps == RDMA_PS_UDP) 2710 mc_map[7] = 0x01; /* Use RDMA CM signature */ 2711 *mgid = *(union ib_gid *) (mc_map + 4); 2712 } else { 2713 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map); 2714 if (id_priv->id.ps == RDMA_PS_UDP) 2715 mc_map[7] = 0x01; /* Use RDMA CM signature */ 2716 *mgid = *(union ib_gid *) (mc_map + 4); 2717 } 2718 } 2719 2720 static int cma_join_ib_multicast(struct rdma_id_private *id_priv, 2721 struct cma_multicast *mc) 2722 { 2723 struct ib_sa_mcmember_rec rec; 2724 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr; 2725 ib_sa_comp_mask comp_mask; 2726 int ret; 2727 2728 ib_addr_get_mgid(dev_addr, &rec.mgid); 2729 ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num, 2730 &rec.mgid, &rec); 2731 if (ret) 2732 return ret; 2733 2734 cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid); 2735 if (id_priv->id.ps == RDMA_PS_UDP) 2736 rec.qkey = cpu_to_be32(RDMA_UDP_QKEY); 2737 rdma_addr_get_sgid(dev_addr, &rec.port_gid); 2738 rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr)); 2739 rec.join_state = 1; 2740 2741 comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID | 2742 IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE | 2743 IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL | 2744 IB_SA_MCMEMBER_REC_FLOW_LABEL | 2745 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS; 2746 2747 if (id_priv->id.ps == RDMA_PS_IPOIB) 2748 comp_mask |= IB_SA_MCMEMBER_REC_RATE | 2749 IB_SA_MCMEMBER_REC_RATE_SELECTOR; 2750 2751 mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device, 2752 id_priv->id.port_num, &rec, 2753 comp_mask, GFP_KERNEL, 2754 cma_ib_mc_handler, mc); 2755 if (IS_ERR(mc->multicast.ib)) 2756 return PTR_ERR(mc->multicast.ib); 2757 2758 return 0; 2759 } 2760 2761 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr, 2762 void *context) 2763 { 2764 struct rdma_id_private *id_priv; 2765 struct cma_multicast *mc; 2766 int ret; 2767 2768 id_priv = container_of(id, struct rdma_id_private, id); 2769 if (!cma_comp(id_priv, CMA_ADDR_BOUND) && 2770 !cma_comp(id_priv, CMA_ADDR_RESOLVED)) 2771 return -EINVAL; 2772 2773 mc = kmalloc(sizeof *mc, GFP_KERNEL); 2774 if (!mc) 2775 return -ENOMEM; 2776 2777 memcpy(&mc->addr, addr, ip_addr_size(addr)); 2778 mc->context = context; 2779 mc->id_priv = id_priv; 2780 2781 spin_lock(&id_priv->lock); 2782 list_add(&mc->list, &id_priv->mc_list); 2783 spin_unlock(&id_priv->lock); 2784 2785 switch (rdma_node_get_transport(id->device->node_type)) { 2786 case RDMA_TRANSPORT_IB: 2787 ret = cma_join_ib_multicast(id_priv, mc); 2788 break; 2789 default: 2790 ret = -ENOSYS; 2791 break; 2792 } 2793 2794 if (ret) { 2795 spin_lock_irq(&id_priv->lock); 2796 list_del(&mc->list); 2797 spin_unlock_irq(&id_priv->lock); 2798 kfree(mc); 2799 } 2800 return ret; 2801 } 2802 EXPORT_SYMBOL(rdma_join_multicast); 2803 2804 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr) 2805 { 2806 struct rdma_id_private *id_priv; 2807 struct cma_multicast *mc; 2808 2809 id_priv = container_of(id, struct rdma_id_private, id); 2810 spin_lock_irq(&id_priv->lock); 2811 list_for_each_entry(mc, &id_priv->mc_list, list) { 2812 if (!memcmp(&mc->addr, addr, ip_addr_size(addr))) { 2813 list_del(&mc->list); 2814 spin_unlock_irq(&id_priv->lock); 2815 2816 if (id->qp) 2817 ib_detach_mcast(id->qp, 2818 &mc->multicast.ib->rec.mgid, 2819 mc->multicast.ib->rec.mlid); 2820 ib_sa_free_multicast(mc->multicast.ib); 2821 kfree(mc); 2822 return; 2823 } 2824 } 2825 spin_unlock_irq(&id_priv->lock); 2826 } 2827 EXPORT_SYMBOL(rdma_leave_multicast); 2828 2829 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv) 2830 { 2831 struct rdma_dev_addr *dev_addr; 2832 struct cma_ndev_work *work; 2833 2834 dev_addr = &id_priv->id.route.addr.dev_addr; 2835 2836 if ((dev_addr->bound_dev_if == ndev->ifindex) && 2837 memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) { 2838 printk(KERN_INFO "RDMA CM addr change for ndev %s used by id %p\n", 2839 ndev->name, &id_priv->id); 2840 work = kzalloc(sizeof *work, GFP_KERNEL); 2841 if (!work) 2842 return -ENOMEM; 2843 2844 INIT_WORK(&work->work, cma_ndev_work_handler); 2845 work->id = id_priv; 2846 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE; 2847 atomic_inc(&id_priv->refcount); 2848 queue_work(cma_wq, &work->work); 2849 } 2850 2851 return 0; 2852 } 2853 2854 static int cma_netdev_callback(struct notifier_block *self, unsigned long event, 2855 void *ctx) 2856 { 2857 struct net_device *ndev = (struct net_device *)ctx; 2858 struct cma_device *cma_dev; 2859 struct rdma_id_private *id_priv; 2860 int ret = NOTIFY_DONE; 2861 2862 if (dev_net(ndev) != &init_net) 2863 return NOTIFY_DONE; 2864 2865 if (event != NETDEV_BONDING_FAILOVER) 2866 return NOTIFY_DONE; 2867 2868 if (!(ndev->flags & IFF_MASTER) || !(ndev->priv_flags & IFF_BONDING)) 2869 return NOTIFY_DONE; 2870 2871 mutex_lock(&lock); 2872 list_for_each_entry(cma_dev, &dev_list, list) 2873 list_for_each_entry(id_priv, &cma_dev->id_list, list) { 2874 ret = cma_netdev_change(ndev, id_priv); 2875 if (ret) 2876 goto out; 2877 } 2878 2879 out: 2880 mutex_unlock(&lock); 2881 return ret; 2882 } 2883 2884 static struct notifier_block cma_nb = { 2885 .notifier_call = cma_netdev_callback 2886 }; 2887 2888 static void cma_add_one(struct ib_device *device) 2889 { 2890 struct cma_device *cma_dev; 2891 struct rdma_id_private *id_priv; 2892 2893 cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL); 2894 if (!cma_dev) 2895 return; 2896 2897 cma_dev->device = device; 2898 2899 init_completion(&cma_dev->comp); 2900 atomic_set(&cma_dev->refcount, 1); 2901 INIT_LIST_HEAD(&cma_dev->id_list); 2902 ib_set_client_data(device, &cma_client, cma_dev); 2903 2904 mutex_lock(&lock); 2905 list_add_tail(&cma_dev->list, &dev_list); 2906 list_for_each_entry(id_priv, &listen_any_list, list) 2907 cma_listen_on_dev(id_priv, cma_dev); 2908 mutex_unlock(&lock); 2909 } 2910 2911 static int cma_remove_id_dev(struct rdma_id_private *id_priv) 2912 { 2913 struct rdma_cm_event event; 2914 enum cma_state state; 2915 int ret = 0; 2916 2917 /* Record that we want to remove the device */ 2918 state = cma_exch(id_priv, CMA_DEVICE_REMOVAL); 2919 if (state == CMA_DESTROYING) 2920 return 0; 2921 2922 cma_cancel_operation(id_priv, state); 2923 mutex_lock(&id_priv->handler_mutex); 2924 2925 /* Check for destruction from another callback. */ 2926 if (!cma_comp(id_priv, CMA_DEVICE_REMOVAL)) 2927 goto out; 2928 2929 memset(&event, 0, sizeof event); 2930 event.event = RDMA_CM_EVENT_DEVICE_REMOVAL; 2931 ret = id_priv->id.event_handler(&id_priv->id, &event); 2932 out: 2933 mutex_unlock(&id_priv->handler_mutex); 2934 return ret; 2935 } 2936 2937 static void cma_process_remove(struct cma_device *cma_dev) 2938 { 2939 struct rdma_id_private *id_priv; 2940 int ret; 2941 2942 mutex_lock(&lock); 2943 while (!list_empty(&cma_dev->id_list)) { 2944 id_priv = list_entry(cma_dev->id_list.next, 2945 struct rdma_id_private, list); 2946 2947 list_del(&id_priv->listen_list); 2948 list_del_init(&id_priv->list); 2949 atomic_inc(&id_priv->refcount); 2950 mutex_unlock(&lock); 2951 2952 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv); 2953 cma_deref_id(id_priv); 2954 if (ret) 2955 rdma_destroy_id(&id_priv->id); 2956 2957 mutex_lock(&lock); 2958 } 2959 mutex_unlock(&lock); 2960 2961 cma_deref_dev(cma_dev); 2962 wait_for_completion(&cma_dev->comp); 2963 } 2964 2965 static void cma_remove_one(struct ib_device *device) 2966 { 2967 struct cma_device *cma_dev; 2968 2969 cma_dev = ib_get_client_data(device, &cma_client); 2970 if (!cma_dev) 2971 return; 2972 2973 mutex_lock(&lock); 2974 list_del(&cma_dev->list); 2975 mutex_unlock(&lock); 2976 2977 cma_process_remove(cma_dev); 2978 kfree(cma_dev); 2979 } 2980 2981 static int __init cma_init(void) 2982 { 2983 int ret; 2984 2985 cma_wq = create_singlethread_workqueue("rdma_cm"); 2986 if (!cma_wq) 2987 return -ENOMEM; 2988 2989 ib_sa_register_client(&sa_client); 2990 rdma_addr_register_client(&addr_client); 2991 register_netdevice_notifier(&cma_nb); 2992 2993 ret = ib_register_client(&cma_client); 2994 if (ret) 2995 goto err; 2996 return 0; 2997 2998 err: 2999 unregister_netdevice_notifier(&cma_nb); 3000 rdma_addr_unregister_client(&addr_client); 3001 ib_sa_unregister_client(&sa_client); 3002 destroy_workqueue(cma_wq); 3003 return ret; 3004 } 3005 3006 static void __exit cma_cleanup(void) 3007 { 3008 ib_unregister_client(&cma_client); 3009 unregister_netdevice_notifier(&cma_nb); 3010 rdma_addr_unregister_client(&addr_client); 3011 ib_sa_unregister_client(&sa_client); 3012 destroy_workqueue(cma_wq); 3013 idr_destroy(&sdp_ps); 3014 idr_destroy(&tcp_ps); 3015 idr_destroy(&udp_ps); 3016 idr_destroy(&ipoib_ps); 3017 } 3018 3019 module_init(cma_init); 3020 module_exit(cma_cleanup); 3021