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