1 /* 2 * Copyright (c) 2005-2006 Intel Corporation. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 */ 32 33 #include <linux/completion.h> 34 #include <linux/file.h> 35 #include <linux/mutex.h> 36 #include <linux/poll.h> 37 #include <linux/sched.h> 38 #include <linux/idr.h> 39 #include <linux/in.h> 40 #include <linux/in6.h> 41 #include <linux/miscdevice.h> 42 #include <linux/slab.h> 43 #include <linux/sysctl.h> 44 45 #include <rdma/rdma_user_cm.h> 46 #include <rdma/ib_marshall.h> 47 #include <rdma/rdma_cm.h> 48 #include <rdma/rdma_cm_ib.h> 49 50 MODULE_AUTHOR("Sean Hefty"); 51 MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access"); 52 MODULE_LICENSE("Dual BSD/GPL"); 53 54 static unsigned int max_backlog = 1024; 55 56 static struct ctl_table_header *ucma_ctl_table_hdr; 57 static ctl_table ucma_ctl_table[] = { 58 { 59 .procname = "max_backlog", 60 .data = &max_backlog, 61 .maxlen = sizeof max_backlog, 62 .mode = 0644, 63 .proc_handler = proc_dointvec, 64 }, 65 { } 66 }; 67 68 static struct ctl_path ucma_ctl_path[] = { 69 { .procname = "net" }, 70 { .procname = "rdma_ucm" }, 71 { } 72 }; 73 74 struct ucma_file { 75 struct mutex mut; 76 struct file *filp; 77 struct list_head ctx_list; 78 struct list_head event_list; 79 wait_queue_head_t poll_wait; 80 }; 81 82 struct ucma_context { 83 int id; 84 struct completion comp; 85 atomic_t ref; 86 int events_reported; 87 int backlog; 88 89 struct ucma_file *file; 90 struct rdma_cm_id *cm_id; 91 u64 uid; 92 93 struct list_head list; 94 struct list_head mc_list; 95 }; 96 97 struct ucma_multicast { 98 struct ucma_context *ctx; 99 int id; 100 int events_reported; 101 102 u64 uid; 103 struct list_head list; 104 struct sockaddr_storage addr; 105 }; 106 107 struct ucma_event { 108 struct ucma_context *ctx; 109 struct ucma_multicast *mc; 110 struct list_head list; 111 struct rdma_cm_id *cm_id; 112 struct rdma_ucm_event_resp resp; 113 }; 114 115 static DEFINE_MUTEX(mut); 116 static DEFINE_IDR(ctx_idr); 117 static DEFINE_IDR(multicast_idr); 118 119 static inline struct ucma_context *_ucma_find_context(int id, 120 struct ucma_file *file) 121 { 122 struct ucma_context *ctx; 123 124 ctx = idr_find(&ctx_idr, id); 125 if (!ctx) 126 ctx = ERR_PTR(-ENOENT); 127 else if (ctx->file != file) 128 ctx = ERR_PTR(-EINVAL); 129 return ctx; 130 } 131 132 static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id) 133 { 134 struct ucma_context *ctx; 135 136 mutex_lock(&mut); 137 ctx = _ucma_find_context(id, file); 138 if (!IS_ERR(ctx)) 139 atomic_inc(&ctx->ref); 140 mutex_unlock(&mut); 141 return ctx; 142 } 143 144 static void ucma_put_ctx(struct ucma_context *ctx) 145 { 146 if (atomic_dec_and_test(&ctx->ref)) 147 complete(&ctx->comp); 148 } 149 150 static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file) 151 { 152 struct ucma_context *ctx; 153 int ret; 154 155 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 156 if (!ctx) 157 return NULL; 158 159 atomic_set(&ctx->ref, 1); 160 init_completion(&ctx->comp); 161 INIT_LIST_HEAD(&ctx->mc_list); 162 ctx->file = file; 163 164 do { 165 ret = idr_pre_get(&ctx_idr, GFP_KERNEL); 166 if (!ret) 167 goto error; 168 169 mutex_lock(&mut); 170 ret = idr_get_new(&ctx_idr, ctx, &ctx->id); 171 mutex_unlock(&mut); 172 } while (ret == -EAGAIN); 173 174 if (ret) 175 goto error; 176 177 list_add_tail(&ctx->list, &file->ctx_list); 178 return ctx; 179 180 error: 181 kfree(ctx); 182 return NULL; 183 } 184 185 static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx) 186 { 187 struct ucma_multicast *mc; 188 int ret; 189 190 mc = kzalloc(sizeof(*mc), GFP_KERNEL); 191 if (!mc) 192 return NULL; 193 194 do { 195 ret = idr_pre_get(&multicast_idr, GFP_KERNEL); 196 if (!ret) 197 goto error; 198 199 mutex_lock(&mut); 200 ret = idr_get_new(&multicast_idr, mc, &mc->id); 201 mutex_unlock(&mut); 202 } while (ret == -EAGAIN); 203 204 if (ret) 205 goto error; 206 207 mc->ctx = ctx; 208 list_add_tail(&mc->list, &ctx->mc_list); 209 return mc; 210 211 error: 212 kfree(mc); 213 return NULL; 214 } 215 216 static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst, 217 struct rdma_conn_param *src) 218 { 219 if (src->private_data_len) 220 memcpy(dst->private_data, src->private_data, 221 src->private_data_len); 222 dst->private_data_len = src->private_data_len; 223 dst->responder_resources =src->responder_resources; 224 dst->initiator_depth = src->initiator_depth; 225 dst->flow_control = src->flow_control; 226 dst->retry_count = src->retry_count; 227 dst->rnr_retry_count = src->rnr_retry_count; 228 dst->srq = src->srq; 229 dst->qp_num = src->qp_num; 230 } 231 232 static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst, 233 struct rdma_ud_param *src) 234 { 235 if (src->private_data_len) 236 memcpy(dst->private_data, src->private_data, 237 src->private_data_len); 238 dst->private_data_len = src->private_data_len; 239 ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr); 240 dst->qp_num = src->qp_num; 241 dst->qkey = src->qkey; 242 } 243 244 static void ucma_set_event_context(struct ucma_context *ctx, 245 struct rdma_cm_event *event, 246 struct ucma_event *uevent) 247 { 248 uevent->ctx = ctx; 249 switch (event->event) { 250 case RDMA_CM_EVENT_MULTICAST_JOIN: 251 case RDMA_CM_EVENT_MULTICAST_ERROR: 252 uevent->mc = (struct ucma_multicast *) 253 event->param.ud.private_data; 254 uevent->resp.uid = uevent->mc->uid; 255 uevent->resp.id = uevent->mc->id; 256 break; 257 default: 258 uevent->resp.uid = ctx->uid; 259 uevent->resp.id = ctx->id; 260 break; 261 } 262 } 263 264 static int ucma_event_handler(struct rdma_cm_id *cm_id, 265 struct rdma_cm_event *event) 266 { 267 struct ucma_event *uevent; 268 struct ucma_context *ctx = cm_id->context; 269 int ret = 0; 270 271 uevent = kzalloc(sizeof(*uevent), GFP_KERNEL); 272 if (!uevent) 273 return event->event == RDMA_CM_EVENT_CONNECT_REQUEST; 274 275 uevent->cm_id = cm_id; 276 ucma_set_event_context(ctx, event, uevent); 277 uevent->resp.event = event->event; 278 uevent->resp.status = event->status; 279 if (cm_id->ps == RDMA_PS_UDP || cm_id->ps == RDMA_PS_IPOIB) 280 ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud); 281 else 282 ucma_copy_conn_event(&uevent->resp.param.conn, 283 &event->param.conn); 284 285 mutex_lock(&ctx->file->mut); 286 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) { 287 if (!ctx->backlog) { 288 ret = -ENOMEM; 289 kfree(uevent); 290 goto out; 291 } 292 ctx->backlog--; 293 } else if (!ctx->uid) { 294 /* 295 * We ignore events for new connections until userspace has set 296 * their context. This can only happen if an error occurs on a 297 * new connection before the user accepts it. This is okay, 298 * since the accept will just fail later. 299 */ 300 kfree(uevent); 301 goto out; 302 } 303 304 list_add_tail(&uevent->list, &ctx->file->event_list); 305 wake_up_interruptible(&ctx->file->poll_wait); 306 out: 307 mutex_unlock(&ctx->file->mut); 308 return ret; 309 } 310 311 static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf, 312 int in_len, int out_len) 313 { 314 struct ucma_context *ctx; 315 struct rdma_ucm_get_event cmd; 316 struct ucma_event *uevent; 317 int ret = 0; 318 DEFINE_WAIT(wait); 319 320 if (out_len < sizeof uevent->resp) 321 return -ENOSPC; 322 323 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 324 return -EFAULT; 325 326 mutex_lock(&file->mut); 327 while (list_empty(&file->event_list)) { 328 mutex_unlock(&file->mut); 329 330 if (file->filp->f_flags & O_NONBLOCK) 331 return -EAGAIN; 332 333 if (wait_event_interruptible(file->poll_wait, 334 !list_empty(&file->event_list))) 335 return -ERESTARTSYS; 336 337 mutex_lock(&file->mut); 338 } 339 340 uevent = list_entry(file->event_list.next, struct ucma_event, list); 341 342 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) { 343 ctx = ucma_alloc_ctx(file); 344 if (!ctx) { 345 ret = -ENOMEM; 346 goto done; 347 } 348 uevent->ctx->backlog++; 349 ctx->cm_id = uevent->cm_id; 350 ctx->cm_id->context = ctx; 351 uevent->resp.id = ctx->id; 352 } 353 354 if (copy_to_user((void __user *)(unsigned long)cmd.response, 355 &uevent->resp, sizeof uevent->resp)) { 356 ret = -EFAULT; 357 goto done; 358 } 359 360 list_del(&uevent->list); 361 uevent->ctx->events_reported++; 362 if (uevent->mc) 363 uevent->mc->events_reported++; 364 kfree(uevent); 365 done: 366 mutex_unlock(&file->mut); 367 return ret; 368 } 369 370 static int ucma_get_qp_type(struct rdma_ucm_create_id *cmd, enum ib_qp_type *qp_type) 371 { 372 switch (cmd->ps) { 373 case RDMA_PS_TCP: 374 *qp_type = IB_QPT_RC; 375 return 0; 376 case RDMA_PS_UDP: 377 case RDMA_PS_IPOIB: 378 *qp_type = IB_QPT_UD; 379 return 0; 380 default: 381 return -EINVAL; 382 } 383 } 384 385 static ssize_t ucma_create_id(struct ucma_file *file, const char __user *inbuf, 386 int in_len, int out_len) 387 { 388 struct rdma_ucm_create_id cmd; 389 struct rdma_ucm_create_id_resp resp; 390 struct ucma_context *ctx; 391 enum ib_qp_type qp_type; 392 int ret; 393 394 if (out_len < sizeof(resp)) 395 return -ENOSPC; 396 397 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 398 return -EFAULT; 399 400 ret = ucma_get_qp_type(&cmd, &qp_type); 401 if (ret) 402 return ret; 403 404 mutex_lock(&file->mut); 405 ctx = ucma_alloc_ctx(file); 406 mutex_unlock(&file->mut); 407 if (!ctx) 408 return -ENOMEM; 409 410 ctx->uid = cmd.uid; 411 ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps, qp_type); 412 if (IS_ERR(ctx->cm_id)) { 413 ret = PTR_ERR(ctx->cm_id); 414 goto err1; 415 } 416 417 resp.id = ctx->id; 418 if (copy_to_user((void __user *)(unsigned long)cmd.response, 419 &resp, sizeof(resp))) { 420 ret = -EFAULT; 421 goto err2; 422 } 423 return 0; 424 425 err2: 426 rdma_destroy_id(ctx->cm_id); 427 err1: 428 mutex_lock(&mut); 429 idr_remove(&ctx_idr, ctx->id); 430 mutex_unlock(&mut); 431 kfree(ctx); 432 return ret; 433 } 434 435 static void ucma_cleanup_multicast(struct ucma_context *ctx) 436 { 437 struct ucma_multicast *mc, *tmp; 438 439 mutex_lock(&mut); 440 list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) { 441 list_del(&mc->list); 442 idr_remove(&multicast_idr, mc->id); 443 kfree(mc); 444 } 445 mutex_unlock(&mut); 446 } 447 448 static void ucma_cleanup_events(struct ucma_context *ctx) 449 { 450 struct ucma_event *uevent, *tmp; 451 452 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) { 453 if (uevent->ctx != ctx) 454 continue; 455 456 list_del(&uevent->list); 457 458 /* clear incoming connections. */ 459 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) 460 rdma_destroy_id(uevent->cm_id); 461 462 kfree(uevent); 463 } 464 } 465 466 static void ucma_cleanup_mc_events(struct ucma_multicast *mc) 467 { 468 struct ucma_event *uevent, *tmp; 469 470 list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) { 471 if (uevent->mc != mc) 472 continue; 473 474 list_del(&uevent->list); 475 kfree(uevent); 476 } 477 } 478 479 static int ucma_free_ctx(struct ucma_context *ctx) 480 { 481 int events_reported; 482 483 /* No new events will be generated after destroying the id. */ 484 rdma_destroy_id(ctx->cm_id); 485 486 ucma_cleanup_multicast(ctx); 487 488 /* Cleanup events not yet reported to the user. */ 489 mutex_lock(&ctx->file->mut); 490 ucma_cleanup_events(ctx); 491 list_del(&ctx->list); 492 mutex_unlock(&ctx->file->mut); 493 494 events_reported = ctx->events_reported; 495 kfree(ctx); 496 return events_reported; 497 } 498 499 static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf, 500 int in_len, int out_len) 501 { 502 struct rdma_ucm_destroy_id cmd; 503 struct rdma_ucm_destroy_id_resp resp; 504 struct ucma_context *ctx; 505 int ret = 0; 506 507 if (out_len < sizeof(resp)) 508 return -ENOSPC; 509 510 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 511 return -EFAULT; 512 513 mutex_lock(&mut); 514 ctx = _ucma_find_context(cmd.id, file); 515 if (!IS_ERR(ctx)) 516 idr_remove(&ctx_idr, ctx->id); 517 mutex_unlock(&mut); 518 519 if (IS_ERR(ctx)) 520 return PTR_ERR(ctx); 521 522 ucma_put_ctx(ctx); 523 wait_for_completion(&ctx->comp); 524 resp.events_reported = ucma_free_ctx(ctx); 525 526 if (copy_to_user((void __user *)(unsigned long)cmd.response, 527 &resp, sizeof(resp))) 528 ret = -EFAULT; 529 530 return ret; 531 } 532 533 static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf, 534 int in_len, int out_len) 535 { 536 struct rdma_ucm_bind_addr cmd; 537 struct ucma_context *ctx; 538 int ret; 539 540 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 541 return -EFAULT; 542 543 ctx = ucma_get_ctx(file, cmd.id); 544 if (IS_ERR(ctx)) 545 return PTR_ERR(ctx); 546 547 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr); 548 ucma_put_ctx(ctx); 549 return ret; 550 } 551 552 static ssize_t ucma_resolve_addr(struct ucma_file *file, 553 const char __user *inbuf, 554 int in_len, int out_len) 555 { 556 struct rdma_ucm_resolve_addr cmd; 557 struct ucma_context *ctx; 558 int ret; 559 560 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 561 return -EFAULT; 562 563 ctx = ucma_get_ctx(file, cmd.id); 564 if (IS_ERR(ctx)) 565 return PTR_ERR(ctx); 566 567 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr, 568 (struct sockaddr *) &cmd.dst_addr, 569 cmd.timeout_ms); 570 ucma_put_ctx(ctx); 571 return ret; 572 } 573 574 static ssize_t ucma_resolve_route(struct ucma_file *file, 575 const char __user *inbuf, 576 int in_len, int out_len) 577 { 578 struct rdma_ucm_resolve_route cmd; 579 struct ucma_context *ctx; 580 int ret; 581 582 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 583 return -EFAULT; 584 585 ctx = ucma_get_ctx(file, cmd.id); 586 if (IS_ERR(ctx)) 587 return PTR_ERR(ctx); 588 589 ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms); 590 ucma_put_ctx(ctx); 591 return ret; 592 } 593 594 static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp, 595 struct rdma_route *route) 596 { 597 struct rdma_dev_addr *dev_addr; 598 599 resp->num_paths = route->num_paths; 600 switch (route->num_paths) { 601 case 0: 602 dev_addr = &route->addr.dev_addr; 603 rdma_addr_get_dgid(dev_addr, 604 (union ib_gid *) &resp->ib_route[0].dgid); 605 rdma_addr_get_sgid(dev_addr, 606 (union ib_gid *) &resp->ib_route[0].sgid); 607 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr)); 608 break; 609 case 2: 610 ib_copy_path_rec_to_user(&resp->ib_route[1], 611 &route->path_rec[1]); 612 /* fall through */ 613 case 1: 614 ib_copy_path_rec_to_user(&resp->ib_route[0], 615 &route->path_rec[0]); 616 break; 617 default: 618 break; 619 } 620 } 621 622 static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp, 623 struct rdma_route *route) 624 { 625 struct rdma_dev_addr *dev_addr; 626 struct net_device *dev; 627 u16 vid = 0; 628 629 resp->num_paths = route->num_paths; 630 switch (route->num_paths) { 631 case 0: 632 dev_addr = &route->addr.dev_addr; 633 dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if); 634 if (dev) { 635 vid = rdma_vlan_dev_vlan_id(dev); 636 dev_put(dev); 637 } 638 639 iboe_mac_vlan_to_ll((union ib_gid *) &resp->ib_route[0].dgid, 640 dev_addr->dst_dev_addr, vid); 641 iboe_addr_get_sgid(dev_addr, 642 (union ib_gid *) &resp->ib_route[0].sgid); 643 resp->ib_route[0].pkey = cpu_to_be16(0xffff); 644 break; 645 case 2: 646 ib_copy_path_rec_to_user(&resp->ib_route[1], 647 &route->path_rec[1]); 648 /* fall through */ 649 case 1: 650 ib_copy_path_rec_to_user(&resp->ib_route[0], 651 &route->path_rec[0]); 652 break; 653 default: 654 break; 655 } 656 } 657 658 static void ucma_copy_iw_route(struct rdma_ucm_query_route_resp *resp, 659 struct rdma_route *route) 660 { 661 struct rdma_dev_addr *dev_addr; 662 663 dev_addr = &route->addr.dev_addr; 664 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &resp->ib_route[0].dgid); 665 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &resp->ib_route[0].sgid); 666 } 667 668 static ssize_t ucma_query_route(struct ucma_file *file, 669 const char __user *inbuf, 670 int in_len, int out_len) 671 { 672 struct rdma_ucm_query_route cmd; 673 struct rdma_ucm_query_route_resp resp; 674 struct ucma_context *ctx; 675 struct sockaddr *addr; 676 int ret = 0; 677 678 if (out_len < sizeof(resp)) 679 return -ENOSPC; 680 681 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 682 return -EFAULT; 683 684 ctx = ucma_get_ctx(file, cmd.id); 685 if (IS_ERR(ctx)) 686 return PTR_ERR(ctx); 687 688 memset(&resp, 0, sizeof resp); 689 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr; 690 memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ? 691 sizeof(struct sockaddr_in) : 692 sizeof(struct sockaddr_in6)); 693 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr; 694 memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ? 695 sizeof(struct sockaddr_in) : 696 sizeof(struct sockaddr_in6)); 697 if (!ctx->cm_id->device) 698 goto out; 699 700 resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid; 701 resp.port_num = ctx->cm_id->port_num; 702 switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) { 703 case RDMA_TRANSPORT_IB: 704 switch (rdma_port_get_link_layer(ctx->cm_id->device, 705 ctx->cm_id->port_num)) { 706 case IB_LINK_LAYER_INFINIBAND: 707 ucma_copy_ib_route(&resp, &ctx->cm_id->route); 708 break; 709 case IB_LINK_LAYER_ETHERNET: 710 ucma_copy_iboe_route(&resp, &ctx->cm_id->route); 711 break; 712 default: 713 break; 714 } 715 break; 716 case RDMA_TRANSPORT_IWARP: 717 ucma_copy_iw_route(&resp, &ctx->cm_id->route); 718 break; 719 default: 720 break; 721 } 722 723 out: 724 if (copy_to_user((void __user *)(unsigned long)cmd.response, 725 &resp, sizeof(resp))) 726 ret = -EFAULT; 727 728 ucma_put_ctx(ctx); 729 return ret; 730 } 731 732 static void ucma_copy_conn_param(struct rdma_conn_param *dst, 733 struct rdma_ucm_conn_param *src) 734 { 735 dst->private_data = src->private_data; 736 dst->private_data_len = src->private_data_len; 737 dst->responder_resources =src->responder_resources; 738 dst->initiator_depth = src->initiator_depth; 739 dst->flow_control = src->flow_control; 740 dst->retry_count = src->retry_count; 741 dst->rnr_retry_count = src->rnr_retry_count; 742 dst->srq = src->srq; 743 dst->qp_num = src->qp_num; 744 } 745 746 static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf, 747 int in_len, int out_len) 748 { 749 struct rdma_ucm_connect cmd; 750 struct rdma_conn_param conn_param; 751 struct ucma_context *ctx; 752 int ret; 753 754 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 755 return -EFAULT; 756 757 if (!cmd.conn_param.valid) 758 return -EINVAL; 759 760 ctx = ucma_get_ctx(file, cmd.id); 761 if (IS_ERR(ctx)) 762 return PTR_ERR(ctx); 763 764 ucma_copy_conn_param(&conn_param, &cmd.conn_param); 765 ret = rdma_connect(ctx->cm_id, &conn_param); 766 ucma_put_ctx(ctx); 767 return ret; 768 } 769 770 static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf, 771 int in_len, int out_len) 772 { 773 struct rdma_ucm_listen cmd; 774 struct ucma_context *ctx; 775 int ret; 776 777 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 778 return -EFAULT; 779 780 ctx = ucma_get_ctx(file, cmd.id); 781 if (IS_ERR(ctx)) 782 return PTR_ERR(ctx); 783 784 ctx->backlog = cmd.backlog > 0 && cmd.backlog < max_backlog ? 785 cmd.backlog : max_backlog; 786 ret = rdma_listen(ctx->cm_id, ctx->backlog); 787 ucma_put_ctx(ctx); 788 return ret; 789 } 790 791 static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf, 792 int in_len, int out_len) 793 { 794 struct rdma_ucm_accept cmd; 795 struct rdma_conn_param conn_param; 796 struct ucma_context *ctx; 797 int ret; 798 799 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 800 return -EFAULT; 801 802 ctx = ucma_get_ctx(file, cmd.id); 803 if (IS_ERR(ctx)) 804 return PTR_ERR(ctx); 805 806 if (cmd.conn_param.valid) { 807 ctx->uid = cmd.uid; 808 ucma_copy_conn_param(&conn_param, &cmd.conn_param); 809 ret = rdma_accept(ctx->cm_id, &conn_param); 810 } else 811 ret = rdma_accept(ctx->cm_id, NULL); 812 813 ucma_put_ctx(ctx); 814 return ret; 815 } 816 817 static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf, 818 int in_len, int out_len) 819 { 820 struct rdma_ucm_reject cmd; 821 struct ucma_context *ctx; 822 int ret; 823 824 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 825 return -EFAULT; 826 827 ctx = ucma_get_ctx(file, cmd.id); 828 if (IS_ERR(ctx)) 829 return PTR_ERR(ctx); 830 831 ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len); 832 ucma_put_ctx(ctx); 833 return ret; 834 } 835 836 static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf, 837 int in_len, int out_len) 838 { 839 struct rdma_ucm_disconnect cmd; 840 struct ucma_context *ctx; 841 int ret; 842 843 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 844 return -EFAULT; 845 846 ctx = ucma_get_ctx(file, cmd.id); 847 if (IS_ERR(ctx)) 848 return PTR_ERR(ctx); 849 850 ret = rdma_disconnect(ctx->cm_id); 851 ucma_put_ctx(ctx); 852 return ret; 853 } 854 855 static ssize_t ucma_init_qp_attr(struct ucma_file *file, 856 const char __user *inbuf, 857 int in_len, int out_len) 858 { 859 struct rdma_ucm_init_qp_attr cmd; 860 struct ib_uverbs_qp_attr resp; 861 struct ucma_context *ctx; 862 struct ib_qp_attr qp_attr; 863 int ret; 864 865 if (out_len < sizeof(resp)) 866 return -ENOSPC; 867 868 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 869 return -EFAULT; 870 871 ctx = ucma_get_ctx(file, cmd.id); 872 if (IS_ERR(ctx)) 873 return PTR_ERR(ctx); 874 875 resp.qp_attr_mask = 0; 876 memset(&qp_attr, 0, sizeof qp_attr); 877 qp_attr.qp_state = cmd.qp_state; 878 ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask); 879 if (ret) 880 goto out; 881 882 ib_copy_qp_attr_to_user(&resp, &qp_attr); 883 if (copy_to_user((void __user *)(unsigned long)cmd.response, 884 &resp, sizeof(resp))) 885 ret = -EFAULT; 886 887 out: 888 ucma_put_ctx(ctx); 889 return ret; 890 } 891 892 static int ucma_set_option_id(struct ucma_context *ctx, int optname, 893 void *optval, size_t optlen) 894 { 895 int ret = 0; 896 897 switch (optname) { 898 case RDMA_OPTION_ID_TOS: 899 if (optlen != sizeof(u8)) { 900 ret = -EINVAL; 901 break; 902 } 903 rdma_set_service_type(ctx->cm_id, *((u8 *) optval)); 904 break; 905 case RDMA_OPTION_ID_REUSEADDR: 906 if (optlen != sizeof(int)) { 907 ret = -EINVAL; 908 break; 909 } 910 ret = rdma_set_reuseaddr(ctx->cm_id, *((int *) optval) ? 1 : 0); 911 break; 912 default: 913 ret = -ENOSYS; 914 } 915 916 return ret; 917 } 918 919 static int ucma_set_ib_path(struct ucma_context *ctx, 920 struct ib_path_rec_data *path_data, size_t optlen) 921 { 922 struct ib_sa_path_rec sa_path; 923 struct rdma_cm_event event; 924 int ret; 925 926 if (optlen % sizeof(*path_data)) 927 return -EINVAL; 928 929 for (; optlen; optlen -= sizeof(*path_data), path_data++) { 930 if (path_data->flags == (IB_PATH_GMP | IB_PATH_PRIMARY | 931 IB_PATH_BIDIRECTIONAL)) 932 break; 933 } 934 935 if (!optlen) 936 return -EINVAL; 937 938 ib_sa_unpack_path(path_data->path_rec, &sa_path); 939 ret = rdma_set_ib_paths(ctx->cm_id, &sa_path, 1); 940 if (ret) 941 return ret; 942 943 memset(&event, 0, sizeof event); 944 event.event = RDMA_CM_EVENT_ROUTE_RESOLVED; 945 return ucma_event_handler(ctx->cm_id, &event); 946 } 947 948 static int ucma_set_option_ib(struct ucma_context *ctx, int optname, 949 void *optval, size_t optlen) 950 { 951 int ret; 952 953 switch (optname) { 954 case RDMA_OPTION_IB_PATH: 955 ret = ucma_set_ib_path(ctx, optval, optlen); 956 break; 957 default: 958 ret = -ENOSYS; 959 } 960 961 return ret; 962 } 963 964 static int ucma_set_option_level(struct ucma_context *ctx, int level, 965 int optname, void *optval, size_t optlen) 966 { 967 int ret; 968 969 switch (level) { 970 case RDMA_OPTION_ID: 971 ret = ucma_set_option_id(ctx, optname, optval, optlen); 972 break; 973 case RDMA_OPTION_IB: 974 ret = ucma_set_option_ib(ctx, optname, optval, optlen); 975 break; 976 default: 977 ret = -ENOSYS; 978 } 979 980 return ret; 981 } 982 983 static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf, 984 int in_len, int out_len) 985 { 986 struct rdma_ucm_set_option cmd; 987 struct ucma_context *ctx; 988 void *optval; 989 int ret; 990 991 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 992 return -EFAULT; 993 994 ctx = ucma_get_ctx(file, cmd.id); 995 if (IS_ERR(ctx)) 996 return PTR_ERR(ctx); 997 998 optval = kmalloc(cmd.optlen, GFP_KERNEL); 999 if (!optval) { 1000 ret = -ENOMEM; 1001 goto out1; 1002 } 1003 1004 if (copy_from_user(optval, (void __user *) (unsigned long) cmd.optval, 1005 cmd.optlen)) { 1006 ret = -EFAULT; 1007 goto out2; 1008 } 1009 1010 ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval, 1011 cmd.optlen); 1012 out2: 1013 kfree(optval); 1014 out1: 1015 ucma_put_ctx(ctx); 1016 return ret; 1017 } 1018 1019 static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf, 1020 int in_len, int out_len) 1021 { 1022 struct rdma_ucm_notify cmd; 1023 struct ucma_context *ctx; 1024 int ret; 1025 1026 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 1027 return -EFAULT; 1028 1029 ctx = ucma_get_ctx(file, cmd.id); 1030 if (IS_ERR(ctx)) 1031 return PTR_ERR(ctx); 1032 1033 ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event); 1034 ucma_put_ctx(ctx); 1035 return ret; 1036 } 1037 1038 static ssize_t ucma_join_multicast(struct ucma_file *file, 1039 const char __user *inbuf, 1040 int in_len, int out_len) 1041 { 1042 struct rdma_ucm_join_mcast cmd; 1043 struct rdma_ucm_create_id_resp resp; 1044 struct ucma_context *ctx; 1045 struct ucma_multicast *mc; 1046 int ret; 1047 1048 if (out_len < sizeof(resp)) 1049 return -ENOSPC; 1050 1051 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 1052 return -EFAULT; 1053 1054 ctx = ucma_get_ctx(file, cmd.id); 1055 if (IS_ERR(ctx)) 1056 return PTR_ERR(ctx); 1057 1058 mutex_lock(&file->mut); 1059 mc = ucma_alloc_multicast(ctx); 1060 if (!mc) { 1061 ret = -ENOMEM; 1062 goto err1; 1063 } 1064 1065 mc->uid = cmd.uid; 1066 memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr); 1067 ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr, mc); 1068 if (ret) 1069 goto err2; 1070 1071 resp.id = mc->id; 1072 if (copy_to_user((void __user *)(unsigned long)cmd.response, 1073 &resp, sizeof(resp))) { 1074 ret = -EFAULT; 1075 goto err3; 1076 } 1077 1078 mutex_unlock(&file->mut); 1079 ucma_put_ctx(ctx); 1080 return 0; 1081 1082 err3: 1083 rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr); 1084 ucma_cleanup_mc_events(mc); 1085 err2: 1086 mutex_lock(&mut); 1087 idr_remove(&multicast_idr, mc->id); 1088 mutex_unlock(&mut); 1089 list_del(&mc->list); 1090 kfree(mc); 1091 err1: 1092 mutex_unlock(&file->mut); 1093 ucma_put_ctx(ctx); 1094 return ret; 1095 } 1096 1097 static ssize_t ucma_leave_multicast(struct ucma_file *file, 1098 const char __user *inbuf, 1099 int in_len, int out_len) 1100 { 1101 struct rdma_ucm_destroy_id cmd; 1102 struct rdma_ucm_destroy_id_resp resp; 1103 struct ucma_multicast *mc; 1104 int ret = 0; 1105 1106 if (out_len < sizeof(resp)) 1107 return -ENOSPC; 1108 1109 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 1110 return -EFAULT; 1111 1112 mutex_lock(&mut); 1113 mc = idr_find(&multicast_idr, cmd.id); 1114 if (!mc) 1115 mc = ERR_PTR(-ENOENT); 1116 else if (mc->ctx->file != file) 1117 mc = ERR_PTR(-EINVAL); 1118 else { 1119 idr_remove(&multicast_idr, mc->id); 1120 atomic_inc(&mc->ctx->ref); 1121 } 1122 mutex_unlock(&mut); 1123 1124 if (IS_ERR(mc)) { 1125 ret = PTR_ERR(mc); 1126 goto out; 1127 } 1128 1129 rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr); 1130 mutex_lock(&mc->ctx->file->mut); 1131 ucma_cleanup_mc_events(mc); 1132 list_del(&mc->list); 1133 mutex_unlock(&mc->ctx->file->mut); 1134 1135 ucma_put_ctx(mc->ctx); 1136 resp.events_reported = mc->events_reported; 1137 kfree(mc); 1138 1139 if (copy_to_user((void __user *)(unsigned long)cmd.response, 1140 &resp, sizeof(resp))) 1141 ret = -EFAULT; 1142 out: 1143 return ret; 1144 } 1145 1146 static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2) 1147 { 1148 /* Acquire mutex's based on pointer comparison to prevent deadlock. */ 1149 if (file1 < file2) { 1150 mutex_lock(&file1->mut); 1151 mutex_lock(&file2->mut); 1152 } else { 1153 mutex_lock(&file2->mut); 1154 mutex_lock(&file1->mut); 1155 } 1156 } 1157 1158 static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2) 1159 { 1160 if (file1 < file2) { 1161 mutex_unlock(&file2->mut); 1162 mutex_unlock(&file1->mut); 1163 } else { 1164 mutex_unlock(&file1->mut); 1165 mutex_unlock(&file2->mut); 1166 } 1167 } 1168 1169 static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file) 1170 { 1171 struct ucma_event *uevent, *tmp; 1172 1173 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) 1174 if (uevent->ctx == ctx) 1175 list_move_tail(&uevent->list, &file->event_list); 1176 } 1177 1178 static ssize_t ucma_migrate_id(struct ucma_file *new_file, 1179 const char __user *inbuf, 1180 int in_len, int out_len) 1181 { 1182 struct rdma_ucm_migrate_id cmd; 1183 struct rdma_ucm_migrate_resp resp; 1184 struct ucma_context *ctx; 1185 struct file *filp; 1186 struct ucma_file *cur_file; 1187 int ret = 0; 1188 1189 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 1190 return -EFAULT; 1191 1192 /* Get current fd to protect against it being closed */ 1193 filp = fget(cmd.fd); 1194 if (!filp) 1195 return -ENOENT; 1196 1197 /* Validate current fd and prevent destruction of id. */ 1198 ctx = ucma_get_ctx(filp->private_data, cmd.id); 1199 if (IS_ERR(ctx)) { 1200 ret = PTR_ERR(ctx); 1201 goto file_put; 1202 } 1203 1204 cur_file = ctx->file; 1205 if (cur_file == new_file) { 1206 resp.events_reported = ctx->events_reported; 1207 goto response; 1208 } 1209 1210 /* 1211 * Migrate events between fd's, maintaining order, and avoiding new 1212 * events being added before existing events. 1213 */ 1214 ucma_lock_files(cur_file, new_file); 1215 mutex_lock(&mut); 1216 1217 list_move_tail(&ctx->list, &new_file->ctx_list); 1218 ucma_move_events(ctx, new_file); 1219 ctx->file = new_file; 1220 resp.events_reported = ctx->events_reported; 1221 1222 mutex_unlock(&mut); 1223 ucma_unlock_files(cur_file, new_file); 1224 1225 response: 1226 if (copy_to_user((void __user *)(unsigned long)cmd.response, 1227 &resp, sizeof(resp))) 1228 ret = -EFAULT; 1229 1230 ucma_put_ctx(ctx); 1231 file_put: 1232 fput(filp); 1233 return ret; 1234 } 1235 1236 static ssize_t (*ucma_cmd_table[])(struct ucma_file *file, 1237 const char __user *inbuf, 1238 int in_len, int out_len) = { 1239 [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id, 1240 [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id, 1241 [RDMA_USER_CM_CMD_BIND_ADDR] = ucma_bind_addr, 1242 [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr, 1243 [RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route, 1244 [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route, 1245 [RDMA_USER_CM_CMD_CONNECT] = ucma_connect, 1246 [RDMA_USER_CM_CMD_LISTEN] = ucma_listen, 1247 [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept, 1248 [RDMA_USER_CM_CMD_REJECT] = ucma_reject, 1249 [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect, 1250 [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr, 1251 [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event, 1252 [RDMA_USER_CM_CMD_GET_OPTION] = NULL, 1253 [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option, 1254 [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify, 1255 [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast, 1256 [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast, 1257 [RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id 1258 }; 1259 1260 static ssize_t ucma_write(struct file *filp, const char __user *buf, 1261 size_t len, loff_t *pos) 1262 { 1263 struct ucma_file *file = filp->private_data; 1264 struct rdma_ucm_cmd_hdr hdr; 1265 ssize_t ret; 1266 1267 if (len < sizeof(hdr)) 1268 return -EINVAL; 1269 1270 if (copy_from_user(&hdr, buf, sizeof(hdr))) 1271 return -EFAULT; 1272 1273 if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucma_cmd_table)) 1274 return -EINVAL; 1275 1276 if (hdr.in + sizeof(hdr) > len) 1277 return -EINVAL; 1278 1279 if (!ucma_cmd_table[hdr.cmd]) 1280 return -ENOSYS; 1281 1282 ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out); 1283 if (!ret) 1284 ret = len; 1285 1286 return ret; 1287 } 1288 1289 static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait) 1290 { 1291 struct ucma_file *file = filp->private_data; 1292 unsigned int mask = 0; 1293 1294 poll_wait(filp, &file->poll_wait, wait); 1295 1296 if (!list_empty(&file->event_list)) 1297 mask = POLLIN | POLLRDNORM; 1298 1299 return mask; 1300 } 1301 1302 /* 1303 * ucma_open() does not need the BKL: 1304 * 1305 * - no global state is referred to; 1306 * - there is no ioctl method to race against; 1307 * - no further module initialization is required for open to work 1308 * after the device is registered. 1309 */ 1310 static int ucma_open(struct inode *inode, struct file *filp) 1311 { 1312 struct ucma_file *file; 1313 1314 file = kmalloc(sizeof *file, GFP_KERNEL); 1315 if (!file) 1316 return -ENOMEM; 1317 1318 INIT_LIST_HEAD(&file->event_list); 1319 INIT_LIST_HEAD(&file->ctx_list); 1320 init_waitqueue_head(&file->poll_wait); 1321 mutex_init(&file->mut); 1322 1323 filp->private_data = file; 1324 file->filp = filp; 1325 1326 return nonseekable_open(inode, filp); 1327 } 1328 1329 static int ucma_close(struct inode *inode, struct file *filp) 1330 { 1331 struct ucma_file *file = filp->private_data; 1332 struct ucma_context *ctx, *tmp; 1333 1334 mutex_lock(&file->mut); 1335 list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) { 1336 mutex_unlock(&file->mut); 1337 1338 mutex_lock(&mut); 1339 idr_remove(&ctx_idr, ctx->id); 1340 mutex_unlock(&mut); 1341 1342 ucma_free_ctx(ctx); 1343 mutex_lock(&file->mut); 1344 } 1345 mutex_unlock(&file->mut); 1346 kfree(file); 1347 return 0; 1348 } 1349 1350 static const struct file_operations ucma_fops = { 1351 .owner = THIS_MODULE, 1352 .open = ucma_open, 1353 .release = ucma_close, 1354 .write = ucma_write, 1355 .poll = ucma_poll, 1356 .llseek = no_llseek, 1357 }; 1358 1359 static struct miscdevice ucma_misc = { 1360 .minor = MISC_DYNAMIC_MINOR, 1361 .name = "rdma_cm", 1362 .nodename = "infiniband/rdma_cm", 1363 .mode = 0666, 1364 .fops = &ucma_fops, 1365 }; 1366 1367 static ssize_t show_abi_version(struct device *dev, 1368 struct device_attribute *attr, 1369 char *buf) 1370 { 1371 return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION); 1372 } 1373 static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL); 1374 1375 static int __init ucma_init(void) 1376 { 1377 int ret; 1378 1379 ret = misc_register(&ucma_misc); 1380 if (ret) 1381 return ret; 1382 1383 ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version); 1384 if (ret) { 1385 printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n"); 1386 goto err1; 1387 } 1388 1389 ucma_ctl_table_hdr = register_sysctl_paths(ucma_ctl_path, ucma_ctl_table); 1390 if (!ucma_ctl_table_hdr) { 1391 printk(KERN_ERR "rdma_ucm: couldn't register sysctl paths\n"); 1392 ret = -ENOMEM; 1393 goto err2; 1394 } 1395 return 0; 1396 err2: 1397 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version); 1398 err1: 1399 misc_deregister(&ucma_misc); 1400 return ret; 1401 } 1402 1403 static void __exit ucma_cleanup(void) 1404 { 1405 unregister_sysctl_table(ucma_ctl_table_hdr); 1406 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version); 1407 misc_deregister(&ucma_misc); 1408 idr_destroy(&ctx_idr); 1409 } 1410 1411 module_init(ucma_init); 1412 module_exit(ucma_cleanup); 1413