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/mutex.h> 35 #include <linux/poll.h> 36 #include <linux/idr.h> 37 #include <linux/in.h> 38 #include <linux/in6.h> 39 #include <linux/miscdevice.h> 40 41 #include <rdma/rdma_user_cm.h> 42 #include <rdma/ib_marshall.h> 43 #include <rdma/rdma_cm.h> 44 45 MODULE_AUTHOR("Sean Hefty"); 46 MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access"); 47 MODULE_LICENSE("Dual BSD/GPL"); 48 49 enum { 50 UCMA_MAX_BACKLOG = 128 51 }; 52 53 struct ucma_file { 54 struct mutex mut; 55 struct file *filp; 56 struct list_head ctx_list; 57 struct list_head event_list; 58 wait_queue_head_t poll_wait; 59 }; 60 61 struct ucma_context { 62 int id; 63 struct completion comp; 64 atomic_t ref; 65 int events_reported; 66 int backlog; 67 68 struct ucma_file *file; 69 struct rdma_cm_id *cm_id; 70 u64 uid; 71 72 struct list_head list; 73 struct list_head mc_list; 74 }; 75 76 struct ucma_multicast { 77 struct ucma_context *ctx; 78 int id; 79 int events_reported; 80 81 u64 uid; 82 struct list_head list; 83 struct sockaddr addr; 84 u8 pad[sizeof(struct sockaddr_in6) - 85 sizeof(struct sockaddr)]; 86 }; 87 88 struct ucma_event { 89 struct ucma_context *ctx; 90 struct ucma_multicast *mc; 91 struct list_head list; 92 struct rdma_cm_id *cm_id; 93 struct rdma_ucm_event_resp resp; 94 }; 95 96 static DEFINE_MUTEX(mut); 97 static DEFINE_IDR(ctx_idr); 98 static DEFINE_IDR(multicast_idr); 99 100 static inline struct ucma_context *_ucma_find_context(int id, 101 struct ucma_file *file) 102 { 103 struct ucma_context *ctx; 104 105 ctx = idr_find(&ctx_idr, id); 106 if (!ctx) 107 ctx = ERR_PTR(-ENOENT); 108 else if (ctx->file != file) 109 ctx = ERR_PTR(-EINVAL); 110 return ctx; 111 } 112 113 static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id) 114 { 115 struct ucma_context *ctx; 116 117 mutex_lock(&mut); 118 ctx = _ucma_find_context(id, file); 119 if (!IS_ERR(ctx)) 120 atomic_inc(&ctx->ref); 121 mutex_unlock(&mut); 122 return ctx; 123 } 124 125 static void ucma_put_ctx(struct ucma_context *ctx) 126 { 127 if (atomic_dec_and_test(&ctx->ref)) 128 complete(&ctx->comp); 129 } 130 131 static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file) 132 { 133 struct ucma_context *ctx; 134 int ret; 135 136 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 137 if (!ctx) 138 return NULL; 139 140 atomic_set(&ctx->ref, 1); 141 init_completion(&ctx->comp); 142 INIT_LIST_HEAD(&ctx->mc_list); 143 ctx->file = file; 144 145 do { 146 ret = idr_pre_get(&ctx_idr, GFP_KERNEL); 147 if (!ret) 148 goto error; 149 150 mutex_lock(&mut); 151 ret = idr_get_new(&ctx_idr, ctx, &ctx->id); 152 mutex_unlock(&mut); 153 } while (ret == -EAGAIN); 154 155 if (ret) 156 goto error; 157 158 list_add_tail(&ctx->list, &file->ctx_list); 159 return ctx; 160 161 error: 162 kfree(ctx); 163 return NULL; 164 } 165 166 static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx) 167 { 168 struct ucma_multicast *mc; 169 int ret; 170 171 mc = kzalloc(sizeof(*mc), GFP_KERNEL); 172 if (!mc) 173 return NULL; 174 175 do { 176 ret = idr_pre_get(&multicast_idr, GFP_KERNEL); 177 if (!ret) 178 goto error; 179 180 mutex_lock(&mut); 181 ret = idr_get_new(&multicast_idr, mc, &mc->id); 182 mutex_unlock(&mut); 183 } while (ret == -EAGAIN); 184 185 if (ret) 186 goto error; 187 188 mc->ctx = ctx; 189 list_add_tail(&mc->list, &ctx->mc_list); 190 return mc; 191 192 error: 193 kfree(mc); 194 return NULL; 195 } 196 197 static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst, 198 struct rdma_conn_param *src) 199 { 200 if (src->private_data_len) 201 memcpy(dst->private_data, src->private_data, 202 src->private_data_len); 203 dst->private_data_len = src->private_data_len; 204 dst->responder_resources =src->responder_resources; 205 dst->initiator_depth = src->initiator_depth; 206 dst->flow_control = src->flow_control; 207 dst->retry_count = src->retry_count; 208 dst->rnr_retry_count = src->rnr_retry_count; 209 dst->srq = src->srq; 210 dst->qp_num = src->qp_num; 211 } 212 213 static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst, 214 struct rdma_ud_param *src) 215 { 216 if (src->private_data_len) 217 memcpy(dst->private_data, src->private_data, 218 src->private_data_len); 219 dst->private_data_len = src->private_data_len; 220 ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr); 221 dst->qp_num = src->qp_num; 222 dst->qkey = src->qkey; 223 } 224 225 static void ucma_set_event_context(struct ucma_context *ctx, 226 struct rdma_cm_event *event, 227 struct ucma_event *uevent) 228 { 229 uevent->ctx = ctx; 230 switch (event->event) { 231 case RDMA_CM_EVENT_MULTICAST_JOIN: 232 case RDMA_CM_EVENT_MULTICAST_ERROR: 233 uevent->mc = (struct ucma_multicast *) 234 event->param.ud.private_data; 235 uevent->resp.uid = uevent->mc->uid; 236 uevent->resp.id = uevent->mc->id; 237 break; 238 default: 239 uevent->resp.uid = ctx->uid; 240 uevent->resp.id = ctx->id; 241 break; 242 } 243 } 244 245 static int ucma_event_handler(struct rdma_cm_id *cm_id, 246 struct rdma_cm_event *event) 247 { 248 struct ucma_event *uevent; 249 struct ucma_context *ctx = cm_id->context; 250 int ret = 0; 251 252 uevent = kzalloc(sizeof(*uevent), GFP_KERNEL); 253 if (!uevent) 254 return event->event == RDMA_CM_EVENT_CONNECT_REQUEST; 255 256 uevent->cm_id = cm_id; 257 ucma_set_event_context(ctx, event, uevent); 258 uevent->resp.event = event->event; 259 uevent->resp.status = event->status; 260 if (cm_id->ps == RDMA_PS_UDP || cm_id->ps == RDMA_PS_IPOIB) 261 ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud); 262 else 263 ucma_copy_conn_event(&uevent->resp.param.conn, 264 &event->param.conn); 265 266 mutex_lock(&ctx->file->mut); 267 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) { 268 if (!ctx->backlog) { 269 ret = -ENOMEM; 270 kfree(uevent); 271 goto out; 272 } 273 ctx->backlog--; 274 } else if (!ctx->uid) { 275 /* 276 * We ignore events for new connections until userspace has set 277 * their context. This can only happen if an error occurs on a 278 * new connection before the user accepts it. This is okay, 279 * since the accept will just fail later. 280 */ 281 kfree(uevent); 282 goto out; 283 } 284 285 list_add_tail(&uevent->list, &ctx->file->event_list); 286 wake_up_interruptible(&ctx->file->poll_wait); 287 out: 288 mutex_unlock(&ctx->file->mut); 289 return ret; 290 } 291 292 static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf, 293 int in_len, int out_len) 294 { 295 struct ucma_context *ctx; 296 struct rdma_ucm_get_event cmd; 297 struct ucma_event *uevent; 298 int ret = 0; 299 DEFINE_WAIT(wait); 300 301 if (out_len < sizeof uevent->resp) 302 return -ENOSPC; 303 304 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 305 return -EFAULT; 306 307 mutex_lock(&file->mut); 308 while (list_empty(&file->event_list)) { 309 if (file->filp->f_flags & O_NONBLOCK) { 310 ret = -EAGAIN; 311 break; 312 } 313 314 if (signal_pending(current)) { 315 ret = -ERESTARTSYS; 316 break; 317 } 318 319 prepare_to_wait(&file->poll_wait, &wait, TASK_INTERRUPTIBLE); 320 mutex_unlock(&file->mut); 321 schedule(); 322 mutex_lock(&file->mut); 323 finish_wait(&file->poll_wait, &wait); 324 } 325 326 if (ret) 327 goto done; 328 329 uevent = list_entry(file->event_list.next, struct ucma_event, list); 330 331 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) { 332 ctx = ucma_alloc_ctx(file); 333 if (!ctx) { 334 ret = -ENOMEM; 335 goto done; 336 } 337 uevent->ctx->backlog++; 338 ctx->cm_id = uevent->cm_id; 339 ctx->cm_id->context = ctx; 340 uevent->resp.id = ctx->id; 341 } 342 343 if (copy_to_user((void __user *)(unsigned long)cmd.response, 344 &uevent->resp, sizeof uevent->resp)) { 345 ret = -EFAULT; 346 goto done; 347 } 348 349 list_del(&uevent->list); 350 uevent->ctx->events_reported++; 351 if (uevent->mc) 352 uevent->mc->events_reported++; 353 kfree(uevent); 354 done: 355 mutex_unlock(&file->mut); 356 return ret; 357 } 358 359 static ssize_t ucma_create_id(struct ucma_file *file, 360 const char __user *inbuf, 361 int in_len, int out_len) 362 { 363 struct rdma_ucm_create_id cmd; 364 struct rdma_ucm_create_id_resp resp; 365 struct ucma_context *ctx; 366 int ret; 367 368 if (out_len < sizeof(resp)) 369 return -ENOSPC; 370 371 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 372 return -EFAULT; 373 374 mutex_lock(&file->mut); 375 ctx = ucma_alloc_ctx(file); 376 mutex_unlock(&file->mut); 377 if (!ctx) 378 return -ENOMEM; 379 380 ctx->uid = cmd.uid; 381 ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps); 382 if (IS_ERR(ctx->cm_id)) { 383 ret = PTR_ERR(ctx->cm_id); 384 goto err1; 385 } 386 387 resp.id = ctx->id; 388 if (copy_to_user((void __user *)(unsigned long)cmd.response, 389 &resp, sizeof(resp))) { 390 ret = -EFAULT; 391 goto err2; 392 } 393 return 0; 394 395 err2: 396 rdma_destroy_id(ctx->cm_id); 397 err1: 398 mutex_lock(&mut); 399 idr_remove(&ctx_idr, ctx->id); 400 mutex_unlock(&mut); 401 kfree(ctx); 402 return ret; 403 } 404 405 static void ucma_cleanup_multicast(struct ucma_context *ctx) 406 { 407 struct ucma_multicast *mc, *tmp; 408 409 mutex_lock(&mut); 410 list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) { 411 list_del(&mc->list); 412 idr_remove(&multicast_idr, mc->id); 413 kfree(mc); 414 } 415 mutex_unlock(&mut); 416 } 417 418 static void ucma_cleanup_events(struct ucma_context *ctx) 419 { 420 struct ucma_event *uevent, *tmp; 421 422 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) { 423 if (uevent->ctx != ctx) 424 continue; 425 426 list_del(&uevent->list); 427 428 /* clear incoming connections. */ 429 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) 430 rdma_destroy_id(uevent->cm_id); 431 432 kfree(uevent); 433 } 434 } 435 436 static void ucma_cleanup_mc_events(struct ucma_multicast *mc) 437 { 438 struct ucma_event *uevent, *tmp; 439 440 list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) { 441 if (uevent->mc != mc) 442 continue; 443 444 list_del(&uevent->list); 445 kfree(uevent); 446 } 447 } 448 449 static int ucma_free_ctx(struct ucma_context *ctx) 450 { 451 int events_reported; 452 453 /* No new events will be generated after destroying the id. */ 454 rdma_destroy_id(ctx->cm_id); 455 456 ucma_cleanup_multicast(ctx); 457 458 /* Cleanup events not yet reported to the user. */ 459 mutex_lock(&ctx->file->mut); 460 ucma_cleanup_events(ctx); 461 list_del(&ctx->list); 462 mutex_unlock(&ctx->file->mut); 463 464 events_reported = ctx->events_reported; 465 kfree(ctx); 466 return events_reported; 467 } 468 469 static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf, 470 int in_len, int out_len) 471 { 472 struct rdma_ucm_destroy_id cmd; 473 struct rdma_ucm_destroy_id_resp resp; 474 struct ucma_context *ctx; 475 int ret = 0; 476 477 if (out_len < sizeof(resp)) 478 return -ENOSPC; 479 480 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 481 return -EFAULT; 482 483 mutex_lock(&mut); 484 ctx = _ucma_find_context(cmd.id, file); 485 if (!IS_ERR(ctx)) 486 idr_remove(&ctx_idr, ctx->id); 487 mutex_unlock(&mut); 488 489 if (IS_ERR(ctx)) 490 return PTR_ERR(ctx); 491 492 ucma_put_ctx(ctx); 493 wait_for_completion(&ctx->comp); 494 resp.events_reported = ucma_free_ctx(ctx); 495 496 if (copy_to_user((void __user *)(unsigned long)cmd.response, 497 &resp, sizeof(resp))) 498 ret = -EFAULT; 499 500 return ret; 501 } 502 503 static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf, 504 int in_len, int out_len) 505 { 506 struct rdma_ucm_bind_addr cmd; 507 struct ucma_context *ctx; 508 int ret; 509 510 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 511 return -EFAULT; 512 513 ctx = ucma_get_ctx(file, cmd.id); 514 if (IS_ERR(ctx)) 515 return PTR_ERR(ctx); 516 517 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr); 518 ucma_put_ctx(ctx); 519 return ret; 520 } 521 522 static ssize_t ucma_resolve_addr(struct ucma_file *file, 523 const char __user *inbuf, 524 int in_len, int out_len) 525 { 526 struct rdma_ucm_resolve_addr cmd; 527 struct ucma_context *ctx; 528 int ret; 529 530 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 531 return -EFAULT; 532 533 ctx = ucma_get_ctx(file, cmd.id); 534 if (IS_ERR(ctx)) 535 return PTR_ERR(ctx); 536 537 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr, 538 (struct sockaddr *) &cmd.dst_addr, 539 cmd.timeout_ms); 540 ucma_put_ctx(ctx); 541 return ret; 542 } 543 544 static ssize_t ucma_resolve_route(struct ucma_file *file, 545 const char __user *inbuf, 546 int in_len, int out_len) 547 { 548 struct rdma_ucm_resolve_route cmd; 549 struct ucma_context *ctx; 550 int ret; 551 552 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 553 return -EFAULT; 554 555 ctx = ucma_get_ctx(file, cmd.id); 556 if (IS_ERR(ctx)) 557 return PTR_ERR(ctx); 558 559 ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms); 560 ucma_put_ctx(ctx); 561 return ret; 562 } 563 564 static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp, 565 struct rdma_route *route) 566 { 567 struct rdma_dev_addr *dev_addr; 568 569 resp->num_paths = route->num_paths; 570 switch (route->num_paths) { 571 case 0: 572 dev_addr = &route->addr.dev_addr; 573 ib_addr_get_dgid(dev_addr, 574 (union ib_gid *) &resp->ib_route[0].dgid); 575 ib_addr_get_sgid(dev_addr, 576 (union ib_gid *) &resp->ib_route[0].sgid); 577 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr)); 578 break; 579 case 2: 580 ib_copy_path_rec_to_user(&resp->ib_route[1], 581 &route->path_rec[1]); 582 /* fall through */ 583 case 1: 584 ib_copy_path_rec_to_user(&resp->ib_route[0], 585 &route->path_rec[0]); 586 break; 587 default: 588 break; 589 } 590 } 591 592 static ssize_t ucma_query_route(struct ucma_file *file, 593 const char __user *inbuf, 594 int in_len, int out_len) 595 { 596 struct rdma_ucm_query_route cmd; 597 struct rdma_ucm_query_route_resp resp; 598 struct ucma_context *ctx; 599 struct sockaddr *addr; 600 int ret = 0; 601 602 if (out_len < sizeof(resp)) 603 return -ENOSPC; 604 605 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 606 return -EFAULT; 607 608 ctx = ucma_get_ctx(file, cmd.id); 609 if (IS_ERR(ctx)) 610 return PTR_ERR(ctx); 611 612 memset(&resp, 0, sizeof resp); 613 addr = &ctx->cm_id->route.addr.src_addr; 614 memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ? 615 sizeof(struct sockaddr_in) : 616 sizeof(struct sockaddr_in6)); 617 addr = &ctx->cm_id->route.addr.dst_addr; 618 memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ? 619 sizeof(struct sockaddr_in) : 620 sizeof(struct sockaddr_in6)); 621 if (!ctx->cm_id->device) 622 goto out; 623 624 resp.node_guid = ctx->cm_id->device->node_guid; 625 resp.port_num = ctx->cm_id->port_num; 626 switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) { 627 case RDMA_TRANSPORT_IB: 628 ucma_copy_ib_route(&resp, &ctx->cm_id->route); 629 break; 630 default: 631 break; 632 } 633 634 out: 635 if (copy_to_user((void __user *)(unsigned long)cmd.response, 636 &resp, sizeof(resp))) 637 ret = -EFAULT; 638 639 ucma_put_ctx(ctx); 640 return ret; 641 } 642 643 static void ucma_copy_conn_param(struct rdma_conn_param *dst, 644 struct rdma_ucm_conn_param *src) 645 { 646 dst->private_data = src->private_data; 647 dst->private_data_len = src->private_data_len; 648 dst->responder_resources =src->responder_resources; 649 dst->initiator_depth = src->initiator_depth; 650 dst->flow_control = src->flow_control; 651 dst->retry_count = src->retry_count; 652 dst->rnr_retry_count = src->rnr_retry_count; 653 dst->srq = src->srq; 654 dst->qp_num = src->qp_num; 655 } 656 657 static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf, 658 int in_len, int out_len) 659 { 660 struct rdma_ucm_connect cmd; 661 struct rdma_conn_param conn_param; 662 struct ucma_context *ctx; 663 int ret; 664 665 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 666 return -EFAULT; 667 668 if (!cmd.conn_param.valid) 669 return -EINVAL; 670 671 ctx = ucma_get_ctx(file, cmd.id); 672 if (IS_ERR(ctx)) 673 return PTR_ERR(ctx); 674 675 ucma_copy_conn_param(&conn_param, &cmd.conn_param); 676 ret = rdma_connect(ctx->cm_id, &conn_param); 677 ucma_put_ctx(ctx); 678 return ret; 679 } 680 681 static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf, 682 int in_len, int out_len) 683 { 684 struct rdma_ucm_listen cmd; 685 struct ucma_context *ctx; 686 int ret; 687 688 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 689 return -EFAULT; 690 691 ctx = ucma_get_ctx(file, cmd.id); 692 if (IS_ERR(ctx)) 693 return PTR_ERR(ctx); 694 695 ctx->backlog = cmd.backlog > 0 && cmd.backlog < UCMA_MAX_BACKLOG ? 696 cmd.backlog : UCMA_MAX_BACKLOG; 697 ret = rdma_listen(ctx->cm_id, ctx->backlog); 698 ucma_put_ctx(ctx); 699 return ret; 700 } 701 702 static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf, 703 int in_len, int out_len) 704 { 705 struct rdma_ucm_accept cmd; 706 struct rdma_conn_param conn_param; 707 struct ucma_context *ctx; 708 int ret; 709 710 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 711 return -EFAULT; 712 713 ctx = ucma_get_ctx(file, cmd.id); 714 if (IS_ERR(ctx)) 715 return PTR_ERR(ctx); 716 717 if (cmd.conn_param.valid) { 718 ctx->uid = cmd.uid; 719 ucma_copy_conn_param(&conn_param, &cmd.conn_param); 720 ret = rdma_accept(ctx->cm_id, &conn_param); 721 } else 722 ret = rdma_accept(ctx->cm_id, NULL); 723 724 ucma_put_ctx(ctx); 725 return ret; 726 } 727 728 static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf, 729 int in_len, int out_len) 730 { 731 struct rdma_ucm_reject cmd; 732 struct ucma_context *ctx; 733 int ret; 734 735 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 736 return -EFAULT; 737 738 ctx = ucma_get_ctx(file, cmd.id); 739 if (IS_ERR(ctx)) 740 return PTR_ERR(ctx); 741 742 ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len); 743 ucma_put_ctx(ctx); 744 return ret; 745 } 746 747 static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf, 748 int in_len, int out_len) 749 { 750 struct rdma_ucm_disconnect cmd; 751 struct ucma_context *ctx; 752 int ret; 753 754 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 755 return -EFAULT; 756 757 ctx = ucma_get_ctx(file, cmd.id); 758 if (IS_ERR(ctx)) 759 return PTR_ERR(ctx); 760 761 ret = rdma_disconnect(ctx->cm_id); 762 ucma_put_ctx(ctx); 763 return ret; 764 } 765 766 static ssize_t ucma_init_qp_attr(struct ucma_file *file, 767 const char __user *inbuf, 768 int in_len, int out_len) 769 { 770 struct rdma_ucm_init_qp_attr cmd; 771 struct ib_uverbs_qp_attr resp; 772 struct ucma_context *ctx; 773 struct ib_qp_attr qp_attr; 774 int ret; 775 776 if (out_len < sizeof(resp)) 777 return -ENOSPC; 778 779 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 780 return -EFAULT; 781 782 ctx = ucma_get_ctx(file, cmd.id); 783 if (IS_ERR(ctx)) 784 return PTR_ERR(ctx); 785 786 resp.qp_attr_mask = 0; 787 memset(&qp_attr, 0, sizeof qp_attr); 788 qp_attr.qp_state = cmd.qp_state; 789 ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask); 790 if (ret) 791 goto out; 792 793 ib_copy_qp_attr_to_user(&resp, &qp_attr); 794 if (copy_to_user((void __user *)(unsigned long)cmd.response, 795 &resp, sizeof(resp))) 796 ret = -EFAULT; 797 798 out: 799 ucma_put_ctx(ctx); 800 return ret; 801 } 802 803 static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf, 804 int in_len, int out_len) 805 { 806 struct rdma_ucm_notify cmd; 807 struct ucma_context *ctx; 808 int ret; 809 810 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 811 return -EFAULT; 812 813 ctx = ucma_get_ctx(file, cmd.id); 814 if (IS_ERR(ctx)) 815 return PTR_ERR(ctx); 816 817 ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event); 818 ucma_put_ctx(ctx); 819 return ret; 820 } 821 822 static ssize_t ucma_join_multicast(struct ucma_file *file, 823 const char __user *inbuf, 824 int in_len, int out_len) 825 { 826 struct rdma_ucm_join_mcast cmd; 827 struct rdma_ucm_create_id_resp resp; 828 struct ucma_context *ctx; 829 struct ucma_multicast *mc; 830 int ret; 831 832 if (out_len < sizeof(resp)) 833 return -ENOSPC; 834 835 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 836 return -EFAULT; 837 838 ctx = ucma_get_ctx(file, cmd.id); 839 if (IS_ERR(ctx)) 840 return PTR_ERR(ctx); 841 842 mutex_lock(&file->mut); 843 mc = ucma_alloc_multicast(ctx); 844 if (IS_ERR(mc)) { 845 ret = PTR_ERR(mc); 846 goto err1; 847 } 848 849 mc->uid = cmd.uid; 850 memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr); 851 ret = rdma_join_multicast(ctx->cm_id, &mc->addr, mc); 852 if (ret) 853 goto err2; 854 855 resp.id = mc->id; 856 if (copy_to_user((void __user *)(unsigned long)cmd.response, 857 &resp, sizeof(resp))) { 858 ret = -EFAULT; 859 goto err3; 860 } 861 862 mutex_unlock(&file->mut); 863 ucma_put_ctx(ctx); 864 return 0; 865 866 err3: 867 rdma_leave_multicast(ctx->cm_id, &mc->addr); 868 ucma_cleanup_mc_events(mc); 869 err2: 870 mutex_lock(&mut); 871 idr_remove(&multicast_idr, mc->id); 872 mutex_unlock(&mut); 873 list_del(&mc->list); 874 kfree(mc); 875 err1: 876 mutex_unlock(&file->mut); 877 ucma_put_ctx(ctx); 878 return ret; 879 } 880 881 static ssize_t ucma_leave_multicast(struct ucma_file *file, 882 const char __user *inbuf, 883 int in_len, int out_len) 884 { 885 struct rdma_ucm_destroy_id cmd; 886 struct rdma_ucm_destroy_id_resp resp; 887 struct ucma_multicast *mc; 888 int ret = 0; 889 890 if (out_len < sizeof(resp)) 891 return -ENOSPC; 892 893 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 894 return -EFAULT; 895 896 mutex_lock(&mut); 897 mc = idr_find(&multicast_idr, cmd.id); 898 if (!mc) 899 mc = ERR_PTR(-ENOENT); 900 else if (mc->ctx->file != file) 901 mc = ERR_PTR(-EINVAL); 902 else { 903 idr_remove(&multicast_idr, mc->id); 904 atomic_inc(&mc->ctx->ref); 905 } 906 mutex_unlock(&mut); 907 908 if (IS_ERR(mc)) { 909 ret = PTR_ERR(mc); 910 goto out; 911 } 912 913 rdma_leave_multicast(mc->ctx->cm_id, &mc->addr); 914 mutex_lock(&mc->ctx->file->mut); 915 ucma_cleanup_mc_events(mc); 916 list_del(&mc->list); 917 mutex_unlock(&mc->ctx->file->mut); 918 919 ucma_put_ctx(mc->ctx); 920 resp.events_reported = mc->events_reported; 921 kfree(mc); 922 923 if (copy_to_user((void __user *)(unsigned long)cmd.response, 924 &resp, sizeof(resp))) 925 ret = -EFAULT; 926 out: 927 return ret; 928 } 929 930 static ssize_t (*ucma_cmd_table[])(struct ucma_file *file, 931 const char __user *inbuf, 932 int in_len, int out_len) = { 933 [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id, 934 [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id, 935 [RDMA_USER_CM_CMD_BIND_ADDR] = ucma_bind_addr, 936 [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr, 937 [RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route, 938 [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route, 939 [RDMA_USER_CM_CMD_CONNECT] = ucma_connect, 940 [RDMA_USER_CM_CMD_LISTEN] = ucma_listen, 941 [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept, 942 [RDMA_USER_CM_CMD_REJECT] = ucma_reject, 943 [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect, 944 [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr, 945 [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event, 946 [RDMA_USER_CM_CMD_GET_OPTION] = NULL, 947 [RDMA_USER_CM_CMD_SET_OPTION] = NULL, 948 [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify, 949 [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast, 950 [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast, 951 }; 952 953 static ssize_t ucma_write(struct file *filp, const char __user *buf, 954 size_t len, loff_t *pos) 955 { 956 struct ucma_file *file = filp->private_data; 957 struct rdma_ucm_cmd_hdr hdr; 958 ssize_t ret; 959 960 if (len < sizeof(hdr)) 961 return -EINVAL; 962 963 if (copy_from_user(&hdr, buf, sizeof(hdr))) 964 return -EFAULT; 965 966 if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucma_cmd_table)) 967 return -EINVAL; 968 969 if (hdr.in + sizeof(hdr) > len) 970 return -EINVAL; 971 972 if (!ucma_cmd_table[hdr.cmd]) 973 return -ENOSYS; 974 975 ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out); 976 if (!ret) 977 ret = len; 978 979 return ret; 980 } 981 982 static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait) 983 { 984 struct ucma_file *file = filp->private_data; 985 unsigned int mask = 0; 986 987 poll_wait(filp, &file->poll_wait, wait); 988 989 if (!list_empty(&file->event_list)) 990 mask = POLLIN | POLLRDNORM; 991 992 return mask; 993 } 994 995 static int ucma_open(struct inode *inode, struct file *filp) 996 { 997 struct ucma_file *file; 998 999 file = kmalloc(sizeof *file, GFP_KERNEL); 1000 if (!file) 1001 return -ENOMEM; 1002 1003 INIT_LIST_HEAD(&file->event_list); 1004 INIT_LIST_HEAD(&file->ctx_list); 1005 init_waitqueue_head(&file->poll_wait); 1006 mutex_init(&file->mut); 1007 1008 filp->private_data = file; 1009 file->filp = filp; 1010 return 0; 1011 } 1012 1013 static int ucma_close(struct inode *inode, struct file *filp) 1014 { 1015 struct ucma_file *file = filp->private_data; 1016 struct ucma_context *ctx, *tmp; 1017 1018 mutex_lock(&file->mut); 1019 list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) { 1020 mutex_unlock(&file->mut); 1021 1022 mutex_lock(&mut); 1023 idr_remove(&ctx_idr, ctx->id); 1024 mutex_unlock(&mut); 1025 1026 ucma_free_ctx(ctx); 1027 mutex_lock(&file->mut); 1028 } 1029 mutex_unlock(&file->mut); 1030 kfree(file); 1031 return 0; 1032 } 1033 1034 static const struct file_operations ucma_fops = { 1035 .owner = THIS_MODULE, 1036 .open = ucma_open, 1037 .release = ucma_close, 1038 .write = ucma_write, 1039 .poll = ucma_poll, 1040 }; 1041 1042 static struct miscdevice ucma_misc = { 1043 .minor = MISC_DYNAMIC_MINOR, 1044 .name = "rdma_cm", 1045 .fops = &ucma_fops, 1046 }; 1047 1048 static ssize_t show_abi_version(struct device *dev, 1049 struct device_attribute *attr, 1050 char *buf) 1051 { 1052 return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION); 1053 } 1054 static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL); 1055 1056 static int __init ucma_init(void) 1057 { 1058 int ret; 1059 1060 ret = misc_register(&ucma_misc); 1061 if (ret) 1062 return ret; 1063 1064 ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version); 1065 if (ret) { 1066 printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n"); 1067 goto err; 1068 } 1069 return 0; 1070 err: 1071 misc_deregister(&ucma_misc); 1072 return ret; 1073 } 1074 1075 static void __exit ucma_cleanup(void) 1076 { 1077 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version); 1078 misc_deregister(&ucma_misc); 1079 idr_destroy(&ctx_idr); 1080 } 1081 1082 module_init(ucma_init); 1083 module_exit(ucma_cleanup); 1084