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 mutex_unlock(&file->mut); 310 311 if (file->filp->f_flags & O_NONBLOCK) 312 return -EAGAIN; 313 314 if (wait_event_interruptible(file->poll_wait, 315 !list_empty(&file->event_list))) 316 return -ERESTARTSYS; 317 318 mutex_lock(&file->mut); 319 } 320 321 uevent = list_entry(file->event_list.next, struct ucma_event, list); 322 323 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) { 324 ctx = ucma_alloc_ctx(file); 325 if (!ctx) { 326 ret = -ENOMEM; 327 goto done; 328 } 329 uevent->ctx->backlog++; 330 ctx->cm_id = uevent->cm_id; 331 ctx->cm_id->context = ctx; 332 uevent->resp.id = ctx->id; 333 } 334 335 if (copy_to_user((void __user *)(unsigned long)cmd.response, 336 &uevent->resp, sizeof uevent->resp)) { 337 ret = -EFAULT; 338 goto done; 339 } 340 341 list_del(&uevent->list); 342 uevent->ctx->events_reported++; 343 if (uevent->mc) 344 uevent->mc->events_reported++; 345 kfree(uevent); 346 done: 347 mutex_unlock(&file->mut); 348 return ret; 349 } 350 351 static ssize_t ucma_create_id(struct ucma_file *file, 352 const char __user *inbuf, 353 int in_len, int out_len) 354 { 355 struct rdma_ucm_create_id cmd; 356 struct rdma_ucm_create_id_resp resp; 357 struct ucma_context *ctx; 358 int ret; 359 360 if (out_len < sizeof(resp)) 361 return -ENOSPC; 362 363 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 364 return -EFAULT; 365 366 mutex_lock(&file->mut); 367 ctx = ucma_alloc_ctx(file); 368 mutex_unlock(&file->mut); 369 if (!ctx) 370 return -ENOMEM; 371 372 ctx->uid = cmd.uid; 373 ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps); 374 if (IS_ERR(ctx->cm_id)) { 375 ret = PTR_ERR(ctx->cm_id); 376 goto err1; 377 } 378 379 resp.id = ctx->id; 380 if (copy_to_user((void __user *)(unsigned long)cmd.response, 381 &resp, sizeof(resp))) { 382 ret = -EFAULT; 383 goto err2; 384 } 385 return 0; 386 387 err2: 388 rdma_destroy_id(ctx->cm_id); 389 err1: 390 mutex_lock(&mut); 391 idr_remove(&ctx_idr, ctx->id); 392 mutex_unlock(&mut); 393 kfree(ctx); 394 return ret; 395 } 396 397 static void ucma_cleanup_multicast(struct ucma_context *ctx) 398 { 399 struct ucma_multicast *mc, *tmp; 400 401 mutex_lock(&mut); 402 list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) { 403 list_del(&mc->list); 404 idr_remove(&multicast_idr, mc->id); 405 kfree(mc); 406 } 407 mutex_unlock(&mut); 408 } 409 410 static void ucma_cleanup_events(struct ucma_context *ctx) 411 { 412 struct ucma_event *uevent, *tmp; 413 414 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) { 415 if (uevent->ctx != ctx) 416 continue; 417 418 list_del(&uevent->list); 419 420 /* clear incoming connections. */ 421 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) 422 rdma_destroy_id(uevent->cm_id); 423 424 kfree(uevent); 425 } 426 } 427 428 static void ucma_cleanup_mc_events(struct ucma_multicast *mc) 429 { 430 struct ucma_event *uevent, *tmp; 431 432 list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) { 433 if (uevent->mc != mc) 434 continue; 435 436 list_del(&uevent->list); 437 kfree(uevent); 438 } 439 } 440 441 static int ucma_free_ctx(struct ucma_context *ctx) 442 { 443 int events_reported; 444 445 /* No new events will be generated after destroying the id. */ 446 rdma_destroy_id(ctx->cm_id); 447 448 ucma_cleanup_multicast(ctx); 449 450 /* Cleanup events not yet reported to the user. */ 451 mutex_lock(&ctx->file->mut); 452 ucma_cleanup_events(ctx); 453 list_del(&ctx->list); 454 mutex_unlock(&ctx->file->mut); 455 456 events_reported = ctx->events_reported; 457 kfree(ctx); 458 return events_reported; 459 } 460 461 static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf, 462 int in_len, int out_len) 463 { 464 struct rdma_ucm_destroy_id cmd; 465 struct rdma_ucm_destroy_id_resp resp; 466 struct ucma_context *ctx; 467 int ret = 0; 468 469 if (out_len < sizeof(resp)) 470 return -ENOSPC; 471 472 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 473 return -EFAULT; 474 475 mutex_lock(&mut); 476 ctx = _ucma_find_context(cmd.id, file); 477 if (!IS_ERR(ctx)) 478 idr_remove(&ctx_idr, ctx->id); 479 mutex_unlock(&mut); 480 481 if (IS_ERR(ctx)) 482 return PTR_ERR(ctx); 483 484 ucma_put_ctx(ctx); 485 wait_for_completion(&ctx->comp); 486 resp.events_reported = ucma_free_ctx(ctx); 487 488 if (copy_to_user((void __user *)(unsigned long)cmd.response, 489 &resp, sizeof(resp))) 490 ret = -EFAULT; 491 492 return ret; 493 } 494 495 static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf, 496 int in_len, int out_len) 497 { 498 struct rdma_ucm_bind_addr cmd; 499 struct ucma_context *ctx; 500 int ret; 501 502 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 503 return -EFAULT; 504 505 ctx = ucma_get_ctx(file, cmd.id); 506 if (IS_ERR(ctx)) 507 return PTR_ERR(ctx); 508 509 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr); 510 ucma_put_ctx(ctx); 511 return ret; 512 } 513 514 static ssize_t ucma_resolve_addr(struct ucma_file *file, 515 const char __user *inbuf, 516 int in_len, int out_len) 517 { 518 struct rdma_ucm_resolve_addr cmd; 519 struct ucma_context *ctx; 520 int ret; 521 522 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 523 return -EFAULT; 524 525 ctx = ucma_get_ctx(file, cmd.id); 526 if (IS_ERR(ctx)) 527 return PTR_ERR(ctx); 528 529 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr, 530 (struct sockaddr *) &cmd.dst_addr, 531 cmd.timeout_ms); 532 ucma_put_ctx(ctx); 533 return ret; 534 } 535 536 static ssize_t ucma_resolve_route(struct ucma_file *file, 537 const char __user *inbuf, 538 int in_len, int out_len) 539 { 540 struct rdma_ucm_resolve_route cmd; 541 struct ucma_context *ctx; 542 int ret; 543 544 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 545 return -EFAULT; 546 547 ctx = ucma_get_ctx(file, cmd.id); 548 if (IS_ERR(ctx)) 549 return PTR_ERR(ctx); 550 551 ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms); 552 ucma_put_ctx(ctx); 553 return ret; 554 } 555 556 static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp, 557 struct rdma_route *route) 558 { 559 struct rdma_dev_addr *dev_addr; 560 561 resp->num_paths = route->num_paths; 562 switch (route->num_paths) { 563 case 0: 564 dev_addr = &route->addr.dev_addr; 565 ib_addr_get_dgid(dev_addr, 566 (union ib_gid *) &resp->ib_route[0].dgid); 567 ib_addr_get_sgid(dev_addr, 568 (union ib_gid *) &resp->ib_route[0].sgid); 569 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr)); 570 break; 571 case 2: 572 ib_copy_path_rec_to_user(&resp->ib_route[1], 573 &route->path_rec[1]); 574 /* fall through */ 575 case 1: 576 ib_copy_path_rec_to_user(&resp->ib_route[0], 577 &route->path_rec[0]); 578 break; 579 default: 580 break; 581 } 582 } 583 584 static ssize_t ucma_query_route(struct ucma_file *file, 585 const char __user *inbuf, 586 int in_len, int out_len) 587 { 588 struct rdma_ucm_query_route cmd; 589 struct rdma_ucm_query_route_resp resp; 590 struct ucma_context *ctx; 591 struct sockaddr *addr; 592 int ret = 0; 593 594 if (out_len < sizeof(resp)) 595 return -ENOSPC; 596 597 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 598 return -EFAULT; 599 600 ctx = ucma_get_ctx(file, cmd.id); 601 if (IS_ERR(ctx)) 602 return PTR_ERR(ctx); 603 604 memset(&resp, 0, sizeof resp); 605 addr = &ctx->cm_id->route.addr.src_addr; 606 memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ? 607 sizeof(struct sockaddr_in) : 608 sizeof(struct sockaddr_in6)); 609 addr = &ctx->cm_id->route.addr.dst_addr; 610 memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ? 611 sizeof(struct sockaddr_in) : 612 sizeof(struct sockaddr_in6)); 613 if (!ctx->cm_id->device) 614 goto out; 615 616 resp.node_guid = ctx->cm_id->device->node_guid; 617 resp.port_num = ctx->cm_id->port_num; 618 switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) { 619 case RDMA_TRANSPORT_IB: 620 ucma_copy_ib_route(&resp, &ctx->cm_id->route); 621 break; 622 default: 623 break; 624 } 625 626 out: 627 if (copy_to_user((void __user *)(unsigned long)cmd.response, 628 &resp, sizeof(resp))) 629 ret = -EFAULT; 630 631 ucma_put_ctx(ctx); 632 return ret; 633 } 634 635 static void ucma_copy_conn_param(struct rdma_conn_param *dst, 636 struct rdma_ucm_conn_param *src) 637 { 638 dst->private_data = src->private_data; 639 dst->private_data_len = src->private_data_len; 640 dst->responder_resources =src->responder_resources; 641 dst->initiator_depth = src->initiator_depth; 642 dst->flow_control = src->flow_control; 643 dst->retry_count = src->retry_count; 644 dst->rnr_retry_count = src->rnr_retry_count; 645 dst->srq = src->srq; 646 dst->qp_num = src->qp_num; 647 } 648 649 static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf, 650 int in_len, int out_len) 651 { 652 struct rdma_ucm_connect cmd; 653 struct rdma_conn_param conn_param; 654 struct ucma_context *ctx; 655 int ret; 656 657 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 658 return -EFAULT; 659 660 if (!cmd.conn_param.valid) 661 return -EINVAL; 662 663 ctx = ucma_get_ctx(file, cmd.id); 664 if (IS_ERR(ctx)) 665 return PTR_ERR(ctx); 666 667 ucma_copy_conn_param(&conn_param, &cmd.conn_param); 668 ret = rdma_connect(ctx->cm_id, &conn_param); 669 ucma_put_ctx(ctx); 670 return ret; 671 } 672 673 static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf, 674 int in_len, int out_len) 675 { 676 struct rdma_ucm_listen cmd; 677 struct ucma_context *ctx; 678 int ret; 679 680 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 681 return -EFAULT; 682 683 ctx = ucma_get_ctx(file, cmd.id); 684 if (IS_ERR(ctx)) 685 return PTR_ERR(ctx); 686 687 ctx->backlog = cmd.backlog > 0 && cmd.backlog < UCMA_MAX_BACKLOG ? 688 cmd.backlog : UCMA_MAX_BACKLOG; 689 ret = rdma_listen(ctx->cm_id, ctx->backlog); 690 ucma_put_ctx(ctx); 691 return ret; 692 } 693 694 static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf, 695 int in_len, int out_len) 696 { 697 struct rdma_ucm_accept cmd; 698 struct rdma_conn_param conn_param; 699 struct ucma_context *ctx; 700 int ret; 701 702 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 703 return -EFAULT; 704 705 ctx = ucma_get_ctx(file, cmd.id); 706 if (IS_ERR(ctx)) 707 return PTR_ERR(ctx); 708 709 if (cmd.conn_param.valid) { 710 ctx->uid = cmd.uid; 711 ucma_copy_conn_param(&conn_param, &cmd.conn_param); 712 ret = rdma_accept(ctx->cm_id, &conn_param); 713 } else 714 ret = rdma_accept(ctx->cm_id, NULL); 715 716 ucma_put_ctx(ctx); 717 return ret; 718 } 719 720 static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf, 721 int in_len, int out_len) 722 { 723 struct rdma_ucm_reject cmd; 724 struct ucma_context *ctx; 725 int ret; 726 727 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 728 return -EFAULT; 729 730 ctx = ucma_get_ctx(file, cmd.id); 731 if (IS_ERR(ctx)) 732 return PTR_ERR(ctx); 733 734 ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len); 735 ucma_put_ctx(ctx); 736 return ret; 737 } 738 739 static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf, 740 int in_len, int out_len) 741 { 742 struct rdma_ucm_disconnect cmd; 743 struct ucma_context *ctx; 744 int ret; 745 746 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 747 return -EFAULT; 748 749 ctx = ucma_get_ctx(file, cmd.id); 750 if (IS_ERR(ctx)) 751 return PTR_ERR(ctx); 752 753 ret = rdma_disconnect(ctx->cm_id); 754 ucma_put_ctx(ctx); 755 return ret; 756 } 757 758 static ssize_t ucma_init_qp_attr(struct ucma_file *file, 759 const char __user *inbuf, 760 int in_len, int out_len) 761 { 762 struct rdma_ucm_init_qp_attr cmd; 763 struct ib_uverbs_qp_attr resp; 764 struct ucma_context *ctx; 765 struct ib_qp_attr qp_attr; 766 int ret; 767 768 if (out_len < sizeof(resp)) 769 return -ENOSPC; 770 771 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 772 return -EFAULT; 773 774 ctx = ucma_get_ctx(file, cmd.id); 775 if (IS_ERR(ctx)) 776 return PTR_ERR(ctx); 777 778 resp.qp_attr_mask = 0; 779 memset(&qp_attr, 0, sizeof qp_attr); 780 qp_attr.qp_state = cmd.qp_state; 781 ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask); 782 if (ret) 783 goto out; 784 785 ib_copy_qp_attr_to_user(&resp, &qp_attr); 786 if (copy_to_user((void __user *)(unsigned long)cmd.response, 787 &resp, sizeof(resp))) 788 ret = -EFAULT; 789 790 out: 791 ucma_put_ctx(ctx); 792 return ret; 793 } 794 795 static int ucma_set_option_id(struct ucma_context *ctx, int optname, 796 void *optval, size_t optlen) 797 { 798 int ret = 0; 799 800 switch (optname) { 801 case RDMA_OPTION_ID_TOS: 802 if (optlen != sizeof(u8)) { 803 ret = -EINVAL; 804 break; 805 } 806 rdma_set_service_type(ctx->cm_id, *((u8 *) optval)); 807 break; 808 default: 809 ret = -ENOSYS; 810 } 811 812 return ret; 813 } 814 815 static int ucma_set_option_level(struct ucma_context *ctx, int level, 816 int optname, void *optval, size_t optlen) 817 { 818 int ret; 819 820 switch (level) { 821 case RDMA_OPTION_ID: 822 ret = ucma_set_option_id(ctx, optname, optval, optlen); 823 break; 824 default: 825 ret = -ENOSYS; 826 } 827 828 return ret; 829 } 830 831 static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf, 832 int in_len, int out_len) 833 { 834 struct rdma_ucm_set_option cmd; 835 struct ucma_context *ctx; 836 void *optval; 837 int ret; 838 839 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 840 return -EFAULT; 841 842 ctx = ucma_get_ctx(file, cmd.id); 843 if (IS_ERR(ctx)) 844 return PTR_ERR(ctx); 845 846 optval = kmalloc(cmd.optlen, GFP_KERNEL); 847 if (!optval) { 848 ret = -ENOMEM; 849 goto out1; 850 } 851 852 if (copy_from_user(optval, (void __user *) (unsigned long) cmd.optval, 853 cmd.optlen)) { 854 ret = -EFAULT; 855 goto out2; 856 } 857 858 ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval, 859 cmd.optlen); 860 out2: 861 kfree(optval); 862 out1: 863 ucma_put_ctx(ctx); 864 return ret; 865 } 866 867 static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf, 868 int in_len, int out_len) 869 { 870 struct rdma_ucm_notify cmd; 871 struct ucma_context *ctx; 872 int ret; 873 874 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 875 return -EFAULT; 876 877 ctx = ucma_get_ctx(file, cmd.id); 878 if (IS_ERR(ctx)) 879 return PTR_ERR(ctx); 880 881 ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event); 882 ucma_put_ctx(ctx); 883 return ret; 884 } 885 886 static ssize_t ucma_join_multicast(struct ucma_file *file, 887 const char __user *inbuf, 888 int in_len, int out_len) 889 { 890 struct rdma_ucm_join_mcast cmd; 891 struct rdma_ucm_create_id_resp resp; 892 struct ucma_context *ctx; 893 struct ucma_multicast *mc; 894 int ret; 895 896 if (out_len < sizeof(resp)) 897 return -ENOSPC; 898 899 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 900 return -EFAULT; 901 902 ctx = ucma_get_ctx(file, cmd.id); 903 if (IS_ERR(ctx)) 904 return PTR_ERR(ctx); 905 906 mutex_lock(&file->mut); 907 mc = ucma_alloc_multicast(ctx); 908 if (IS_ERR(mc)) { 909 ret = PTR_ERR(mc); 910 goto err1; 911 } 912 913 mc->uid = cmd.uid; 914 memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr); 915 ret = rdma_join_multicast(ctx->cm_id, &mc->addr, mc); 916 if (ret) 917 goto err2; 918 919 resp.id = mc->id; 920 if (copy_to_user((void __user *)(unsigned long)cmd.response, 921 &resp, sizeof(resp))) { 922 ret = -EFAULT; 923 goto err3; 924 } 925 926 mutex_unlock(&file->mut); 927 ucma_put_ctx(ctx); 928 return 0; 929 930 err3: 931 rdma_leave_multicast(ctx->cm_id, &mc->addr); 932 ucma_cleanup_mc_events(mc); 933 err2: 934 mutex_lock(&mut); 935 idr_remove(&multicast_idr, mc->id); 936 mutex_unlock(&mut); 937 list_del(&mc->list); 938 kfree(mc); 939 err1: 940 mutex_unlock(&file->mut); 941 ucma_put_ctx(ctx); 942 return ret; 943 } 944 945 static ssize_t ucma_leave_multicast(struct ucma_file *file, 946 const char __user *inbuf, 947 int in_len, int out_len) 948 { 949 struct rdma_ucm_destroy_id cmd; 950 struct rdma_ucm_destroy_id_resp resp; 951 struct ucma_multicast *mc; 952 int ret = 0; 953 954 if (out_len < sizeof(resp)) 955 return -ENOSPC; 956 957 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 958 return -EFAULT; 959 960 mutex_lock(&mut); 961 mc = idr_find(&multicast_idr, cmd.id); 962 if (!mc) 963 mc = ERR_PTR(-ENOENT); 964 else if (mc->ctx->file != file) 965 mc = ERR_PTR(-EINVAL); 966 else { 967 idr_remove(&multicast_idr, mc->id); 968 atomic_inc(&mc->ctx->ref); 969 } 970 mutex_unlock(&mut); 971 972 if (IS_ERR(mc)) { 973 ret = PTR_ERR(mc); 974 goto out; 975 } 976 977 rdma_leave_multicast(mc->ctx->cm_id, &mc->addr); 978 mutex_lock(&mc->ctx->file->mut); 979 ucma_cleanup_mc_events(mc); 980 list_del(&mc->list); 981 mutex_unlock(&mc->ctx->file->mut); 982 983 ucma_put_ctx(mc->ctx); 984 resp.events_reported = mc->events_reported; 985 kfree(mc); 986 987 if (copy_to_user((void __user *)(unsigned long)cmd.response, 988 &resp, sizeof(resp))) 989 ret = -EFAULT; 990 out: 991 return ret; 992 } 993 994 static ssize_t (*ucma_cmd_table[])(struct ucma_file *file, 995 const char __user *inbuf, 996 int in_len, int out_len) = { 997 [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id, 998 [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id, 999 [RDMA_USER_CM_CMD_BIND_ADDR] = ucma_bind_addr, 1000 [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr, 1001 [RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route, 1002 [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route, 1003 [RDMA_USER_CM_CMD_CONNECT] = ucma_connect, 1004 [RDMA_USER_CM_CMD_LISTEN] = ucma_listen, 1005 [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept, 1006 [RDMA_USER_CM_CMD_REJECT] = ucma_reject, 1007 [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect, 1008 [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr, 1009 [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event, 1010 [RDMA_USER_CM_CMD_GET_OPTION] = NULL, 1011 [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option, 1012 [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify, 1013 [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast, 1014 [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast, 1015 }; 1016 1017 static ssize_t ucma_write(struct file *filp, const char __user *buf, 1018 size_t len, loff_t *pos) 1019 { 1020 struct ucma_file *file = filp->private_data; 1021 struct rdma_ucm_cmd_hdr hdr; 1022 ssize_t ret; 1023 1024 if (len < sizeof(hdr)) 1025 return -EINVAL; 1026 1027 if (copy_from_user(&hdr, buf, sizeof(hdr))) 1028 return -EFAULT; 1029 1030 if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucma_cmd_table)) 1031 return -EINVAL; 1032 1033 if (hdr.in + sizeof(hdr) > len) 1034 return -EINVAL; 1035 1036 if (!ucma_cmd_table[hdr.cmd]) 1037 return -ENOSYS; 1038 1039 ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out); 1040 if (!ret) 1041 ret = len; 1042 1043 return ret; 1044 } 1045 1046 static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait) 1047 { 1048 struct ucma_file *file = filp->private_data; 1049 unsigned int mask = 0; 1050 1051 poll_wait(filp, &file->poll_wait, wait); 1052 1053 if (!list_empty(&file->event_list)) 1054 mask = POLLIN | POLLRDNORM; 1055 1056 return mask; 1057 } 1058 1059 static int ucma_open(struct inode *inode, struct file *filp) 1060 { 1061 struct ucma_file *file; 1062 1063 file = kmalloc(sizeof *file, GFP_KERNEL); 1064 if (!file) 1065 return -ENOMEM; 1066 1067 INIT_LIST_HEAD(&file->event_list); 1068 INIT_LIST_HEAD(&file->ctx_list); 1069 init_waitqueue_head(&file->poll_wait); 1070 mutex_init(&file->mut); 1071 1072 filp->private_data = file; 1073 file->filp = filp; 1074 return 0; 1075 } 1076 1077 static int ucma_close(struct inode *inode, struct file *filp) 1078 { 1079 struct ucma_file *file = filp->private_data; 1080 struct ucma_context *ctx, *tmp; 1081 1082 mutex_lock(&file->mut); 1083 list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) { 1084 mutex_unlock(&file->mut); 1085 1086 mutex_lock(&mut); 1087 idr_remove(&ctx_idr, ctx->id); 1088 mutex_unlock(&mut); 1089 1090 ucma_free_ctx(ctx); 1091 mutex_lock(&file->mut); 1092 } 1093 mutex_unlock(&file->mut); 1094 kfree(file); 1095 return 0; 1096 } 1097 1098 static const struct file_operations ucma_fops = { 1099 .owner = THIS_MODULE, 1100 .open = ucma_open, 1101 .release = ucma_close, 1102 .write = ucma_write, 1103 .poll = ucma_poll, 1104 }; 1105 1106 static struct miscdevice ucma_misc = { 1107 .minor = MISC_DYNAMIC_MINOR, 1108 .name = "rdma_cm", 1109 .fops = &ucma_fops, 1110 }; 1111 1112 static ssize_t show_abi_version(struct device *dev, 1113 struct device_attribute *attr, 1114 char *buf) 1115 { 1116 return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION); 1117 } 1118 static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL); 1119 1120 static int __init ucma_init(void) 1121 { 1122 int ret; 1123 1124 ret = misc_register(&ucma_misc); 1125 if (ret) 1126 return ret; 1127 1128 ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version); 1129 if (ret) { 1130 printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n"); 1131 goto err; 1132 } 1133 return 0; 1134 err: 1135 misc_deregister(&ucma_misc); 1136 return ret; 1137 } 1138 1139 static void __exit ucma_cleanup(void) 1140 { 1141 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version); 1142 misc_deregister(&ucma_misc); 1143 idr_destroy(&ctx_idr); 1144 } 1145 1146 module_init(ucma_init); 1147 module_exit(ucma_cleanup); 1148