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 #include <linux/module.h> 45 46 #include <rdma/rdma_user_cm.h> 47 #include <rdma/ib_marshall.h> 48 #include <rdma/rdma_cm.h> 49 #include <rdma/rdma_cm_ib.h> 50 51 MODULE_AUTHOR("Sean Hefty"); 52 MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access"); 53 MODULE_LICENSE("Dual BSD/GPL"); 54 55 static unsigned int max_backlog = 1024; 56 57 static struct ctl_table_header *ucma_ctl_table_hdr; 58 static ctl_table ucma_ctl_table[] = { 59 { 60 .procname = "max_backlog", 61 .data = &max_backlog, 62 .maxlen = sizeof max_backlog, 63 .mode = 0644, 64 .proc_handler = proc_dointvec, 65 }, 66 { } 67 }; 68 69 static struct ctl_path ucma_ctl_path[] = { 70 { .procname = "net" }, 71 { .procname = "rdma_ucm" }, 72 { } 73 }; 74 75 struct ucma_file { 76 struct mutex mut; 77 struct file *filp; 78 struct list_head ctx_list; 79 struct list_head event_list; 80 wait_queue_head_t poll_wait; 81 }; 82 83 struct ucma_context { 84 int id; 85 struct completion comp; 86 atomic_t ref; 87 int events_reported; 88 int backlog; 89 90 struct ucma_file *file; 91 struct rdma_cm_id *cm_id; 92 u64 uid; 93 94 struct list_head list; 95 struct list_head mc_list; 96 }; 97 98 struct ucma_multicast { 99 struct ucma_context *ctx; 100 int id; 101 int events_reported; 102 103 u64 uid; 104 struct list_head list; 105 struct sockaddr_storage addr; 106 }; 107 108 struct ucma_event { 109 struct ucma_context *ctx; 110 struct ucma_multicast *mc; 111 struct list_head list; 112 struct rdma_cm_id *cm_id; 113 struct rdma_ucm_event_resp resp; 114 }; 115 116 static DEFINE_MUTEX(mut); 117 static DEFINE_IDR(ctx_idr); 118 static DEFINE_IDR(multicast_idr); 119 120 static inline struct ucma_context *_ucma_find_context(int id, 121 struct ucma_file *file) 122 { 123 struct ucma_context *ctx; 124 125 ctx = idr_find(&ctx_idr, id); 126 if (!ctx) 127 ctx = ERR_PTR(-ENOENT); 128 else if (ctx->file != file) 129 ctx = ERR_PTR(-EINVAL); 130 return ctx; 131 } 132 133 static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id) 134 { 135 struct ucma_context *ctx; 136 137 mutex_lock(&mut); 138 ctx = _ucma_find_context(id, file); 139 if (!IS_ERR(ctx)) 140 atomic_inc(&ctx->ref); 141 mutex_unlock(&mut); 142 return ctx; 143 } 144 145 static void ucma_put_ctx(struct ucma_context *ctx) 146 { 147 if (atomic_dec_and_test(&ctx->ref)) 148 complete(&ctx->comp); 149 } 150 151 static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file) 152 { 153 struct ucma_context *ctx; 154 int ret; 155 156 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 157 if (!ctx) 158 return NULL; 159 160 atomic_set(&ctx->ref, 1); 161 init_completion(&ctx->comp); 162 INIT_LIST_HEAD(&ctx->mc_list); 163 ctx->file = file; 164 165 do { 166 ret = idr_pre_get(&ctx_idr, GFP_KERNEL); 167 if (!ret) 168 goto error; 169 170 mutex_lock(&mut); 171 ret = idr_get_new(&ctx_idr, ctx, &ctx->id); 172 mutex_unlock(&mut); 173 } while (ret == -EAGAIN); 174 175 if (ret) 176 goto error; 177 178 list_add_tail(&ctx->list, &file->ctx_list); 179 return ctx; 180 181 error: 182 kfree(ctx); 183 return NULL; 184 } 185 186 static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx) 187 { 188 struct ucma_multicast *mc; 189 int ret; 190 191 mc = kzalloc(sizeof(*mc), GFP_KERNEL); 192 if (!mc) 193 return NULL; 194 195 do { 196 ret = idr_pre_get(&multicast_idr, GFP_KERNEL); 197 if (!ret) 198 goto error; 199 200 mutex_lock(&mut); 201 ret = idr_get_new(&multicast_idr, mc, &mc->id); 202 mutex_unlock(&mut); 203 } while (ret == -EAGAIN); 204 205 if (ret) 206 goto error; 207 208 mc->ctx = ctx; 209 list_add_tail(&mc->list, &ctx->mc_list); 210 return mc; 211 212 error: 213 kfree(mc); 214 return NULL; 215 } 216 217 static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst, 218 struct rdma_conn_param *src) 219 { 220 if (src->private_data_len) 221 memcpy(dst->private_data, src->private_data, 222 src->private_data_len); 223 dst->private_data_len = src->private_data_len; 224 dst->responder_resources =src->responder_resources; 225 dst->initiator_depth = src->initiator_depth; 226 dst->flow_control = src->flow_control; 227 dst->retry_count = src->retry_count; 228 dst->rnr_retry_count = src->rnr_retry_count; 229 dst->srq = src->srq; 230 dst->qp_num = src->qp_num; 231 } 232 233 static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst, 234 struct rdma_ud_param *src) 235 { 236 if (src->private_data_len) 237 memcpy(dst->private_data, src->private_data, 238 src->private_data_len); 239 dst->private_data_len = src->private_data_len; 240 ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr); 241 dst->qp_num = src->qp_num; 242 dst->qkey = src->qkey; 243 } 244 245 static void ucma_set_event_context(struct ucma_context *ctx, 246 struct rdma_cm_event *event, 247 struct ucma_event *uevent) 248 { 249 uevent->ctx = ctx; 250 switch (event->event) { 251 case RDMA_CM_EVENT_MULTICAST_JOIN: 252 case RDMA_CM_EVENT_MULTICAST_ERROR: 253 uevent->mc = (struct ucma_multicast *) 254 event->param.ud.private_data; 255 uevent->resp.uid = uevent->mc->uid; 256 uevent->resp.id = uevent->mc->id; 257 break; 258 default: 259 uevent->resp.uid = ctx->uid; 260 uevent->resp.id = ctx->id; 261 break; 262 } 263 } 264 265 static int ucma_event_handler(struct rdma_cm_id *cm_id, 266 struct rdma_cm_event *event) 267 { 268 struct ucma_event *uevent; 269 struct ucma_context *ctx = cm_id->context; 270 int ret = 0; 271 272 uevent = kzalloc(sizeof(*uevent), GFP_KERNEL); 273 if (!uevent) 274 return event->event == RDMA_CM_EVENT_CONNECT_REQUEST; 275 276 uevent->cm_id = cm_id; 277 ucma_set_event_context(ctx, event, uevent); 278 uevent->resp.event = event->event; 279 uevent->resp.status = event->status; 280 if (cm_id->qp_type == IB_QPT_UD) 281 ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud); 282 else 283 ucma_copy_conn_event(&uevent->resp.param.conn, 284 &event->param.conn); 285 286 mutex_lock(&ctx->file->mut); 287 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) { 288 if (!ctx->backlog) { 289 ret = -ENOMEM; 290 kfree(uevent); 291 goto out; 292 } 293 ctx->backlog--; 294 } else if (!ctx->uid) { 295 /* 296 * We ignore events for new connections until userspace has set 297 * their context. This can only happen if an error occurs on a 298 * new connection before the user accepts it. This is okay, 299 * since the accept will just fail later. 300 */ 301 kfree(uevent); 302 goto out; 303 } 304 305 list_add_tail(&uevent->list, &ctx->file->event_list); 306 wake_up_interruptible(&ctx->file->poll_wait); 307 out: 308 mutex_unlock(&ctx->file->mut); 309 return ret; 310 } 311 312 static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf, 313 int in_len, int out_len) 314 { 315 struct ucma_context *ctx; 316 struct rdma_ucm_get_event cmd; 317 struct ucma_event *uevent; 318 int ret = 0; 319 DEFINE_WAIT(wait); 320 321 if (out_len < sizeof uevent->resp) 322 return -ENOSPC; 323 324 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 325 return -EFAULT; 326 327 mutex_lock(&file->mut); 328 while (list_empty(&file->event_list)) { 329 mutex_unlock(&file->mut); 330 331 if (file->filp->f_flags & O_NONBLOCK) 332 return -EAGAIN; 333 334 if (wait_event_interruptible(file->poll_wait, 335 !list_empty(&file->event_list))) 336 return -ERESTARTSYS; 337 338 mutex_lock(&file->mut); 339 } 340 341 uevent = list_entry(file->event_list.next, struct ucma_event, list); 342 343 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) { 344 ctx = ucma_alloc_ctx(file); 345 if (!ctx) { 346 ret = -ENOMEM; 347 goto done; 348 } 349 uevent->ctx->backlog++; 350 ctx->cm_id = uevent->cm_id; 351 ctx->cm_id->context = ctx; 352 uevent->resp.id = ctx->id; 353 } 354 355 if (copy_to_user((void __user *)(unsigned long)cmd.response, 356 &uevent->resp, sizeof uevent->resp)) { 357 ret = -EFAULT; 358 goto done; 359 } 360 361 list_del(&uevent->list); 362 uevent->ctx->events_reported++; 363 if (uevent->mc) 364 uevent->mc->events_reported++; 365 kfree(uevent); 366 done: 367 mutex_unlock(&file->mut); 368 return ret; 369 } 370 371 static int ucma_get_qp_type(struct rdma_ucm_create_id *cmd, enum ib_qp_type *qp_type) 372 { 373 switch (cmd->ps) { 374 case RDMA_PS_TCP: 375 *qp_type = IB_QPT_RC; 376 return 0; 377 case RDMA_PS_UDP: 378 case RDMA_PS_IPOIB: 379 *qp_type = IB_QPT_UD; 380 return 0; 381 case RDMA_PS_IB: 382 *qp_type = cmd->qp_type; 383 return 0; 384 default: 385 return -EINVAL; 386 } 387 } 388 389 static ssize_t ucma_create_id(struct ucma_file *file, const char __user *inbuf, 390 int in_len, int out_len) 391 { 392 struct rdma_ucm_create_id cmd; 393 struct rdma_ucm_create_id_resp resp; 394 struct ucma_context *ctx; 395 enum ib_qp_type qp_type; 396 int ret; 397 398 if (out_len < sizeof(resp)) 399 return -ENOSPC; 400 401 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 402 return -EFAULT; 403 404 ret = ucma_get_qp_type(&cmd, &qp_type); 405 if (ret) 406 return ret; 407 408 mutex_lock(&file->mut); 409 ctx = ucma_alloc_ctx(file); 410 mutex_unlock(&file->mut); 411 if (!ctx) 412 return -ENOMEM; 413 414 ctx->uid = cmd.uid; 415 ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps, qp_type); 416 if (IS_ERR(ctx->cm_id)) { 417 ret = PTR_ERR(ctx->cm_id); 418 goto err1; 419 } 420 421 resp.id = ctx->id; 422 if (copy_to_user((void __user *)(unsigned long)cmd.response, 423 &resp, sizeof(resp))) { 424 ret = -EFAULT; 425 goto err2; 426 } 427 return 0; 428 429 err2: 430 rdma_destroy_id(ctx->cm_id); 431 err1: 432 mutex_lock(&mut); 433 idr_remove(&ctx_idr, ctx->id); 434 mutex_unlock(&mut); 435 kfree(ctx); 436 return ret; 437 } 438 439 static void ucma_cleanup_multicast(struct ucma_context *ctx) 440 { 441 struct ucma_multicast *mc, *tmp; 442 443 mutex_lock(&mut); 444 list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) { 445 list_del(&mc->list); 446 idr_remove(&multicast_idr, mc->id); 447 kfree(mc); 448 } 449 mutex_unlock(&mut); 450 } 451 452 static void ucma_cleanup_events(struct ucma_context *ctx) 453 { 454 struct ucma_event *uevent, *tmp; 455 456 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) { 457 if (uevent->ctx != ctx) 458 continue; 459 460 list_del(&uevent->list); 461 462 /* clear incoming connections. */ 463 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) 464 rdma_destroy_id(uevent->cm_id); 465 466 kfree(uevent); 467 } 468 } 469 470 static void ucma_cleanup_mc_events(struct ucma_multicast *mc) 471 { 472 struct ucma_event *uevent, *tmp; 473 474 list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) { 475 if (uevent->mc != mc) 476 continue; 477 478 list_del(&uevent->list); 479 kfree(uevent); 480 } 481 } 482 483 static int ucma_free_ctx(struct ucma_context *ctx) 484 { 485 int events_reported; 486 487 /* No new events will be generated after destroying the id. */ 488 rdma_destroy_id(ctx->cm_id); 489 490 ucma_cleanup_multicast(ctx); 491 492 /* Cleanup events not yet reported to the user. */ 493 mutex_lock(&ctx->file->mut); 494 ucma_cleanup_events(ctx); 495 list_del(&ctx->list); 496 mutex_unlock(&ctx->file->mut); 497 498 events_reported = ctx->events_reported; 499 kfree(ctx); 500 return events_reported; 501 } 502 503 static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf, 504 int in_len, int out_len) 505 { 506 struct rdma_ucm_destroy_id cmd; 507 struct rdma_ucm_destroy_id_resp resp; 508 struct ucma_context *ctx; 509 int ret = 0; 510 511 if (out_len < sizeof(resp)) 512 return -ENOSPC; 513 514 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 515 return -EFAULT; 516 517 mutex_lock(&mut); 518 ctx = _ucma_find_context(cmd.id, file); 519 if (!IS_ERR(ctx)) 520 idr_remove(&ctx_idr, ctx->id); 521 mutex_unlock(&mut); 522 523 if (IS_ERR(ctx)) 524 return PTR_ERR(ctx); 525 526 ucma_put_ctx(ctx); 527 wait_for_completion(&ctx->comp); 528 resp.events_reported = ucma_free_ctx(ctx); 529 530 if (copy_to_user((void __user *)(unsigned long)cmd.response, 531 &resp, sizeof(resp))) 532 ret = -EFAULT; 533 534 return ret; 535 } 536 537 static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf, 538 int in_len, int out_len) 539 { 540 struct rdma_ucm_bind_addr 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_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr); 552 ucma_put_ctx(ctx); 553 return ret; 554 } 555 556 static ssize_t ucma_resolve_addr(struct ucma_file *file, 557 const char __user *inbuf, 558 int in_len, int out_len) 559 { 560 struct rdma_ucm_resolve_addr cmd; 561 struct ucma_context *ctx; 562 int ret; 563 564 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 565 return -EFAULT; 566 567 ctx = ucma_get_ctx(file, cmd.id); 568 if (IS_ERR(ctx)) 569 return PTR_ERR(ctx); 570 571 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr, 572 (struct sockaddr *) &cmd.dst_addr, 573 cmd.timeout_ms); 574 ucma_put_ctx(ctx); 575 return ret; 576 } 577 578 static ssize_t ucma_resolve_route(struct ucma_file *file, 579 const char __user *inbuf, 580 int in_len, int out_len) 581 { 582 struct rdma_ucm_resolve_route cmd; 583 struct ucma_context *ctx; 584 int ret; 585 586 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 587 return -EFAULT; 588 589 ctx = ucma_get_ctx(file, cmd.id); 590 if (IS_ERR(ctx)) 591 return PTR_ERR(ctx); 592 593 ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms); 594 ucma_put_ctx(ctx); 595 return ret; 596 } 597 598 static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp, 599 struct rdma_route *route) 600 { 601 struct rdma_dev_addr *dev_addr; 602 603 resp->num_paths = route->num_paths; 604 switch (route->num_paths) { 605 case 0: 606 dev_addr = &route->addr.dev_addr; 607 rdma_addr_get_dgid(dev_addr, 608 (union ib_gid *) &resp->ib_route[0].dgid); 609 rdma_addr_get_sgid(dev_addr, 610 (union ib_gid *) &resp->ib_route[0].sgid); 611 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr)); 612 break; 613 case 2: 614 ib_copy_path_rec_to_user(&resp->ib_route[1], 615 &route->path_rec[1]); 616 /* fall through */ 617 case 1: 618 ib_copy_path_rec_to_user(&resp->ib_route[0], 619 &route->path_rec[0]); 620 break; 621 default: 622 break; 623 } 624 } 625 626 static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp, 627 struct rdma_route *route) 628 { 629 struct rdma_dev_addr *dev_addr; 630 struct net_device *dev; 631 u16 vid = 0; 632 633 resp->num_paths = route->num_paths; 634 switch (route->num_paths) { 635 case 0: 636 dev_addr = &route->addr.dev_addr; 637 dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if); 638 if (dev) { 639 vid = rdma_vlan_dev_vlan_id(dev); 640 dev_put(dev); 641 } 642 643 iboe_mac_vlan_to_ll((union ib_gid *) &resp->ib_route[0].dgid, 644 dev_addr->dst_dev_addr, vid); 645 iboe_addr_get_sgid(dev_addr, 646 (union ib_gid *) &resp->ib_route[0].sgid); 647 resp->ib_route[0].pkey = cpu_to_be16(0xffff); 648 break; 649 case 2: 650 ib_copy_path_rec_to_user(&resp->ib_route[1], 651 &route->path_rec[1]); 652 /* fall through */ 653 case 1: 654 ib_copy_path_rec_to_user(&resp->ib_route[0], 655 &route->path_rec[0]); 656 break; 657 default: 658 break; 659 } 660 } 661 662 static void ucma_copy_iw_route(struct rdma_ucm_query_route_resp *resp, 663 struct rdma_route *route) 664 { 665 struct rdma_dev_addr *dev_addr; 666 667 dev_addr = &route->addr.dev_addr; 668 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &resp->ib_route[0].dgid); 669 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &resp->ib_route[0].sgid); 670 } 671 672 static ssize_t ucma_query_route(struct ucma_file *file, 673 const char __user *inbuf, 674 int in_len, int out_len) 675 { 676 struct rdma_ucm_query_route cmd; 677 struct rdma_ucm_query_route_resp resp; 678 struct ucma_context *ctx; 679 struct sockaddr *addr; 680 int ret = 0; 681 682 if (out_len < sizeof(resp)) 683 return -ENOSPC; 684 685 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 686 return -EFAULT; 687 688 ctx = ucma_get_ctx(file, cmd.id); 689 if (IS_ERR(ctx)) 690 return PTR_ERR(ctx); 691 692 memset(&resp, 0, sizeof resp); 693 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr; 694 memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ? 695 sizeof(struct sockaddr_in) : 696 sizeof(struct sockaddr_in6)); 697 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr; 698 memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ? 699 sizeof(struct sockaddr_in) : 700 sizeof(struct sockaddr_in6)); 701 if (!ctx->cm_id->device) 702 goto out; 703 704 resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid; 705 resp.port_num = ctx->cm_id->port_num; 706 switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) { 707 case RDMA_TRANSPORT_IB: 708 switch (rdma_port_get_link_layer(ctx->cm_id->device, 709 ctx->cm_id->port_num)) { 710 case IB_LINK_LAYER_INFINIBAND: 711 ucma_copy_ib_route(&resp, &ctx->cm_id->route); 712 break; 713 case IB_LINK_LAYER_ETHERNET: 714 ucma_copy_iboe_route(&resp, &ctx->cm_id->route); 715 break; 716 default: 717 break; 718 } 719 break; 720 case RDMA_TRANSPORT_IWARP: 721 ucma_copy_iw_route(&resp, &ctx->cm_id->route); 722 break; 723 default: 724 break; 725 } 726 727 out: 728 if (copy_to_user((void __user *)(unsigned long)cmd.response, 729 &resp, sizeof(resp))) 730 ret = -EFAULT; 731 732 ucma_put_ctx(ctx); 733 return ret; 734 } 735 736 static void ucma_copy_conn_param(struct rdma_conn_param *dst, 737 struct rdma_ucm_conn_param *src) 738 { 739 dst->private_data = src->private_data; 740 dst->private_data_len = src->private_data_len; 741 dst->responder_resources =src->responder_resources; 742 dst->initiator_depth = src->initiator_depth; 743 dst->flow_control = src->flow_control; 744 dst->retry_count = src->retry_count; 745 dst->rnr_retry_count = src->rnr_retry_count; 746 dst->srq = src->srq; 747 dst->qp_num = src->qp_num; 748 } 749 750 static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf, 751 int in_len, int out_len) 752 { 753 struct rdma_ucm_connect cmd; 754 struct rdma_conn_param conn_param; 755 struct ucma_context *ctx; 756 int ret; 757 758 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 759 return -EFAULT; 760 761 if (!cmd.conn_param.valid) 762 return -EINVAL; 763 764 ctx = ucma_get_ctx(file, cmd.id); 765 if (IS_ERR(ctx)) 766 return PTR_ERR(ctx); 767 768 ucma_copy_conn_param(&conn_param, &cmd.conn_param); 769 ret = rdma_connect(ctx->cm_id, &conn_param); 770 ucma_put_ctx(ctx); 771 return ret; 772 } 773 774 static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf, 775 int in_len, int out_len) 776 { 777 struct rdma_ucm_listen cmd; 778 struct ucma_context *ctx; 779 int ret; 780 781 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 782 return -EFAULT; 783 784 ctx = ucma_get_ctx(file, cmd.id); 785 if (IS_ERR(ctx)) 786 return PTR_ERR(ctx); 787 788 ctx->backlog = cmd.backlog > 0 && cmd.backlog < max_backlog ? 789 cmd.backlog : max_backlog; 790 ret = rdma_listen(ctx->cm_id, ctx->backlog); 791 ucma_put_ctx(ctx); 792 return ret; 793 } 794 795 static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf, 796 int in_len, int out_len) 797 { 798 struct rdma_ucm_accept cmd; 799 struct rdma_conn_param conn_param; 800 struct ucma_context *ctx; 801 int ret; 802 803 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 804 return -EFAULT; 805 806 ctx = ucma_get_ctx(file, cmd.id); 807 if (IS_ERR(ctx)) 808 return PTR_ERR(ctx); 809 810 if (cmd.conn_param.valid) { 811 ctx->uid = cmd.uid; 812 ucma_copy_conn_param(&conn_param, &cmd.conn_param); 813 ret = rdma_accept(ctx->cm_id, &conn_param); 814 } else 815 ret = rdma_accept(ctx->cm_id, NULL); 816 817 ucma_put_ctx(ctx); 818 return ret; 819 } 820 821 static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf, 822 int in_len, int out_len) 823 { 824 struct rdma_ucm_reject cmd; 825 struct ucma_context *ctx; 826 int ret; 827 828 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 829 return -EFAULT; 830 831 ctx = ucma_get_ctx(file, cmd.id); 832 if (IS_ERR(ctx)) 833 return PTR_ERR(ctx); 834 835 ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len); 836 ucma_put_ctx(ctx); 837 return ret; 838 } 839 840 static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf, 841 int in_len, int out_len) 842 { 843 struct rdma_ucm_disconnect cmd; 844 struct ucma_context *ctx; 845 int ret; 846 847 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 848 return -EFAULT; 849 850 ctx = ucma_get_ctx(file, cmd.id); 851 if (IS_ERR(ctx)) 852 return PTR_ERR(ctx); 853 854 ret = rdma_disconnect(ctx->cm_id); 855 ucma_put_ctx(ctx); 856 return ret; 857 } 858 859 static ssize_t ucma_init_qp_attr(struct ucma_file *file, 860 const char __user *inbuf, 861 int in_len, int out_len) 862 { 863 struct rdma_ucm_init_qp_attr cmd; 864 struct ib_uverbs_qp_attr resp; 865 struct ucma_context *ctx; 866 struct ib_qp_attr qp_attr; 867 int ret; 868 869 if (out_len < sizeof(resp)) 870 return -ENOSPC; 871 872 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 873 return -EFAULT; 874 875 ctx = ucma_get_ctx(file, cmd.id); 876 if (IS_ERR(ctx)) 877 return PTR_ERR(ctx); 878 879 resp.qp_attr_mask = 0; 880 memset(&qp_attr, 0, sizeof qp_attr); 881 qp_attr.qp_state = cmd.qp_state; 882 ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask); 883 if (ret) 884 goto out; 885 886 ib_copy_qp_attr_to_user(&resp, &qp_attr); 887 if (copy_to_user((void __user *)(unsigned long)cmd.response, 888 &resp, sizeof(resp))) 889 ret = -EFAULT; 890 891 out: 892 ucma_put_ctx(ctx); 893 return ret; 894 } 895 896 static int ucma_set_option_id(struct ucma_context *ctx, int optname, 897 void *optval, size_t optlen) 898 { 899 int ret = 0; 900 901 switch (optname) { 902 case RDMA_OPTION_ID_TOS: 903 if (optlen != sizeof(u8)) { 904 ret = -EINVAL; 905 break; 906 } 907 rdma_set_service_type(ctx->cm_id, *((u8 *) optval)); 908 break; 909 case RDMA_OPTION_ID_REUSEADDR: 910 if (optlen != sizeof(int)) { 911 ret = -EINVAL; 912 break; 913 } 914 ret = rdma_set_reuseaddr(ctx->cm_id, *((int *) optval) ? 1 : 0); 915 break; 916 default: 917 ret = -ENOSYS; 918 } 919 920 return ret; 921 } 922 923 static int ucma_set_ib_path(struct ucma_context *ctx, 924 struct ib_path_rec_data *path_data, size_t optlen) 925 { 926 struct ib_sa_path_rec sa_path; 927 struct rdma_cm_event event; 928 int ret; 929 930 if (optlen % sizeof(*path_data)) 931 return -EINVAL; 932 933 for (; optlen; optlen -= sizeof(*path_data), path_data++) { 934 if (path_data->flags == (IB_PATH_GMP | IB_PATH_PRIMARY | 935 IB_PATH_BIDIRECTIONAL)) 936 break; 937 } 938 939 if (!optlen) 940 return -EINVAL; 941 942 ib_sa_unpack_path(path_data->path_rec, &sa_path); 943 ret = rdma_set_ib_paths(ctx->cm_id, &sa_path, 1); 944 if (ret) 945 return ret; 946 947 memset(&event, 0, sizeof event); 948 event.event = RDMA_CM_EVENT_ROUTE_RESOLVED; 949 return ucma_event_handler(ctx->cm_id, &event); 950 } 951 952 static int ucma_set_option_ib(struct ucma_context *ctx, int optname, 953 void *optval, size_t optlen) 954 { 955 int ret; 956 957 switch (optname) { 958 case RDMA_OPTION_IB_PATH: 959 ret = ucma_set_ib_path(ctx, optval, optlen); 960 break; 961 default: 962 ret = -ENOSYS; 963 } 964 965 return ret; 966 } 967 968 static int ucma_set_option_level(struct ucma_context *ctx, int level, 969 int optname, void *optval, size_t optlen) 970 { 971 int ret; 972 973 switch (level) { 974 case RDMA_OPTION_ID: 975 ret = ucma_set_option_id(ctx, optname, optval, optlen); 976 break; 977 case RDMA_OPTION_IB: 978 ret = ucma_set_option_ib(ctx, optname, optval, optlen); 979 break; 980 default: 981 ret = -ENOSYS; 982 } 983 984 return ret; 985 } 986 987 static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf, 988 int in_len, int out_len) 989 { 990 struct rdma_ucm_set_option cmd; 991 struct ucma_context *ctx; 992 void *optval; 993 int ret; 994 995 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 996 return -EFAULT; 997 998 ctx = ucma_get_ctx(file, cmd.id); 999 if (IS_ERR(ctx)) 1000 return PTR_ERR(ctx); 1001 1002 optval = kmalloc(cmd.optlen, GFP_KERNEL); 1003 if (!optval) { 1004 ret = -ENOMEM; 1005 goto out1; 1006 } 1007 1008 if (copy_from_user(optval, (void __user *) (unsigned long) cmd.optval, 1009 cmd.optlen)) { 1010 ret = -EFAULT; 1011 goto out2; 1012 } 1013 1014 ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval, 1015 cmd.optlen); 1016 out2: 1017 kfree(optval); 1018 out1: 1019 ucma_put_ctx(ctx); 1020 return ret; 1021 } 1022 1023 static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf, 1024 int in_len, int out_len) 1025 { 1026 struct rdma_ucm_notify cmd; 1027 struct ucma_context *ctx; 1028 int ret; 1029 1030 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 1031 return -EFAULT; 1032 1033 ctx = ucma_get_ctx(file, cmd.id); 1034 if (IS_ERR(ctx)) 1035 return PTR_ERR(ctx); 1036 1037 ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event); 1038 ucma_put_ctx(ctx); 1039 return ret; 1040 } 1041 1042 static ssize_t ucma_join_multicast(struct ucma_file *file, 1043 const char __user *inbuf, 1044 int in_len, int out_len) 1045 { 1046 struct rdma_ucm_join_mcast cmd; 1047 struct rdma_ucm_create_id_resp resp; 1048 struct ucma_context *ctx; 1049 struct ucma_multicast *mc; 1050 int ret; 1051 1052 if (out_len < sizeof(resp)) 1053 return -ENOSPC; 1054 1055 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 1056 return -EFAULT; 1057 1058 ctx = ucma_get_ctx(file, cmd.id); 1059 if (IS_ERR(ctx)) 1060 return PTR_ERR(ctx); 1061 1062 mutex_lock(&file->mut); 1063 mc = ucma_alloc_multicast(ctx); 1064 if (!mc) { 1065 ret = -ENOMEM; 1066 goto err1; 1067 } 1068 1069 mc->uid = cmd.uid; 1070 memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr); 1071 ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr, mc); 1072 if (ret) 1073 goto err2; 1074 1075 resp.id = mc->id; 1076 if (copy_to_user((void __user *)(unsigned long)cmd.response, 1077 &resp, sizeof(resp))) { 1078 ret = -EFAULT; 1079 goto err3; 1080 } 1081 1082 mutex_unlock(&file->mut); 1083 ucma_put_ctx(ctx); 1084 return 0; 1085 1086 err3: 1087 rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr); 1088 ucma_cleanup_mc_events(mc); 1089 err2: 1090 mutex_lock(&mut); 1091 idr_remove(&multicast_idr, mc->id); 1092 mutex_unlock(&mut); 1093 list_del(&mc->list); 1094 kfree(mc); 1095 err1: 1096 mutex_unlock(&file->mut); 1097 ucma_put_ctx(ctx); 1098 return ret; 1099 } 1100 1101 static ssize_t ucma_leave_multicast(struct ucma_file *file, 1102 const char __user *inbuf, 1103 int in_len, int out_len) 1104 { 1105 struct rdma_ucm_destroy_id cmd; 1106 struct rdma_ucm_destroy_id_resp resp; 1107 struct ucma_multicast *mc; 1108 int ret = 0; 1109 1110 if (out_len < sizeof(resp)) 1111 return -ENOSPC; 1112 1113 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 1114 return -EFAULT; 1115 1116 mutex_lock(&mut); 1117 mc = idr_find(&multicast_idr, cmd.id); 1118 if (!mc) 1119 mc = ERR_PTR(-ENOENT); 1120 else if (mc->ctx->file != file) 1121 mc = ERR_PTR(-EINVAL); 1122 else { 1123 idr_remove(&multicast_idr, mc->id); 1124 atomic_inc(&mc->ctx->ref); 1125 } 1126 mutex_unlock(&mut); 1127 1128 if (IS_ERR(mc)) { 1129 ret = PTR_ERR(mc); 1130 goto out; 1131 } 1132 1133 rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr); 1134 mutex_lock(&mc->ctx->file->mut); 1135 ucma_cleanup_mc_events(mc); 1136 list_del(&mc->list); 1137 mutex_unlock(&mc->ctx->file->mut); 1138 1139 ucma_put_ctx(mc->ctx); 1140 resp.events_reported = mc->events_reported; 1141 kfree(mc); 1142 1143 if (copy_to_user((void __user *)(unsigned long)cmd.response, 1144 &resp, sizeof(resp))) 1145 ret = -EFAULT; 1146 out: 1147 return ret; 1148 } 1149 1150 static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2) 1151 { 1152 /* Acquire mutex's based on pointer comparison to prevent deadlock. */ 1153 if (file1 < file2) { 1154 mutex_lock(&file1->mut); 1155 mutex_lock(&file2->mut); 1156 } else { 1157 mutex_lock(&file2->mut); 1158 mutex_lock(&file1->mut); 1159 } 1160 } 1161 1162 static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2) 1163 { 1164 if (file1 < file2) { 1165 mutex_unlock(&file2->mut); 1166 mutex_unlock(&file1->mut); 1167 } else { 1168 mutex_unlock(&file1->mut); 1169 mutex_unlock(&file2->mut); 1170 } 1171 } 1172 1173 static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file) 1174 { 1175 struct ucma_event *uevent, *tmp; 1176 1177 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) 1178 if (uevent->ctx == ctx) 1179 list_move_tail(&uevent->list, &file->event_list); 1180 } 1181 1182 static ssize_t ucma_migrate_id(struct ucma_file *new_file, 1183 const char __user *inbuf, 1184 int in_len, int out_len) 1185 { 1186 struct rdma_ucm_migrate_id cmd; 1187 struct rdma_ucm_migrate_resp resp; 1188 struct ucma_context *ctx; 1189 struct file *filp; 1190 struct ucma_file *cur_file; 1191 int ret = 0; 1192 1193 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 1194 return -EFAULT; 1195 1196 /* Get current fd to protect against it being closed */ 1197 filp = fget(cmd.fd); 1198 if (!filp) 1199 return -ENOENT; 1200 1201 /* Validate current fd and prevent destruction of id. */ 1202 ctx = ucma_get_ctx(filp->private_data, cmd.id); 1203 if (IS_ERR(ctx)) { 1204 ret = PTR_ERR(ctx); 1205 goto file_put; 1206 } 1207 1208 cur_file = ctx->file; 1209 if (cur_file == new_file) { 1210 resp.events_reported = ctx->events_reported; 1211 goto response; 1212 } 1213 1214 /* 1215 * Migrate events between fd's, maintaining order, and avoiding new 1216 * events being added before existing events. 1217 */ 1218 ucma_lock_files(cur_file, new_file); 1219 mutex_lock(&mut); 1220 1221 list_move_tail(&ctx->list, &new_file->ctx_list); 1222 ucma_move_events(ctx, new_file); 1223 ctx->file = new_file; 1224 resp.events_reported = ctx->events_reported; 1225 1226 mutex_unlock(&mut); 1227 ucma_unlock_files(cur_file, new_file); 1228 1229 response: 1230 if (copy_to_user((void __user *)(unsigned long)cmd.response, 1231 &resp, sizeof(resp))) 1232 ret = -EFAULT; 1233 1234 ucma_put_ctx(ctx); 1235 file_put: 1236 fput(filp); 1237 return ret; 1238 } 1239 1240 static ssize_t (*ucma_cmd_table[])(struct ucma_file *file, 1241 const char __user *inbuf, 1242 int in_len, int out_len) = { 1243 [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id, 1244 [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id, 1245 [RDMA_USER_CM_CMD_BIND_ADDR] = ucma_bind_addr, 1246 [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr, 1247 [RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route, 1248 [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route, 1249 [RDMA_USER_CM_CMD_CONNECT] = ucma_connect, 1250 [RDMA_USER_CM_CMD_LISTEN] = ucma_listen, 1251 [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept, 1252 [RDMA_USER_CM_CMD_REJECT] = ucma_reject, 1253 [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect, 1254 [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr, 1255 [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event, 1256 [RDMA_USER_CM_CMD_GET_OPTION] = NULL, 1257 [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option, 1258 [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify, 1259 [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast, 1260 [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast, 1261 [RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id 1262 }; 1263 1264 static ssize_t ucma_write(struct file *filp, const char __user *buf, 1265 size_t len, loff_t *pos) 1266 { 1267 struct ucma_file *file = filp->private_data; 1268 struct rdma_ucm_cmd_hdr hdr; 1269 ssize_t ret; 1270 1271 if (len < sizeof(hdr)) 1272 return -EINVAL; 1273 1274 if (copy_from_user(&hdr, buf, sizeof(hdr))) 1275 return -EFAULT; 1276 1277 if (hdr.cmd >= ARRAY_SIZE(ucma_cmd_table)) 1278 return -EINVAL; 1279 1280 if (hdr.in + sizeof(hdr) > len) 1281 return -EINVAL; 1282 1283 if (!ucma_cmd_table[hdr.cmd]) 1284 return -ENOSYS; 1285 1286 ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out); 1287 if (!ret) 1288 ret = len; 1289 1290 return ret; 1291 } 1292 1293 static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait) 1294 { 1295 struct ucma_file *file = filp->private_data; 1296 unsigned int mask = 0; 1297 1298 poll_wait(filp, &file->poll_wait, wait); 1299 1300 if (!list_empty(&file->event_list)) 1301 mask = POLLIN | POLLRDNORM; 1302 1303 return mask; 1304 } 1305 1306 /* 1307 * ucma_open() does not need the BKL: 1308 * 1309 * - no global state is referred to; 1310 * - there is no ioctl method to race against; 1311 * - no further module initialization is required for open to work 1312 * after the device is registered. 1313 */ 1314 static int ucma_open(struct inode *inode, struct file *filp) 1315 { 1316 struct ucma_file *file; 1317 1318 file = kmalloc(sizeof *file, GFP_KERNEL); 1319 if (!file) 1320 return -ENOMEM; 1321 1322 INIT_LIST_HEAD(&file->event_list); 1323 INIT_LIST_HEAD(&file->ctx_list); 1324 init_waitqueue_head(&file->poll_wait); 1325 mutex_init(&file->mut); 1326 1327 filp->private_data = file; 1328 file->filp = filp; 1329 1330 return nonseekable_open(inode, filp); 1331 } 1332 1333 static int ucma_close(struct inode *inode, struct file *filp) 1334 { 1335 struct ucma_file *file = filp->private_data; 1336 struct ucma_context *ctx, *tmp; 1337 1338 mutex_lock(&file->mut); 1339 list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) { 1340 mutex_unlock(&file->mut); 1341 1342 mutex_lock(&mut); 1343 idr_remove(&ctx_idr, ctx->id); 1344 mutex_unlock(&mut); 1345 1346 ucma_free_ctx(ctx); 1347 mutex_lock(&file->mut); 1348 } 1349 mutex_unlock(&file->mut); 1350 kfree(file); 1351 return 0; 1352 } 1353 1354 static const struct file_operations ucma_fops = { 1355 .owner = THIS_MODULE, 1356 .open = ucma_open, 1357 .release = ucma_close, 1358 .write = ucma_write, 1359 .poll = ucma_poll, 1360 .llseek = no_llseek, 1361 }; 1362 1363 static struct miscdevice ucma_misc = { 1364 .minor = MISC_DYNAMIC_MINOR, 1365 .name = "rdma_cm", 1366 .nodename = "infiniband/rdma_cm", 1367 .mode = 0666, 1368 .fops = &ucma_fops, 1369 }; 1370 1371 static ssize_t show_abi_version(struct device *dev, 1372 struct device_attribute *attr, 1373 char *buf) 1374 { 1375 return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION); 1376 } 1377 static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL); 1378 1379 static int __init ucma_init(void) 1380 { 1381 int ret; 1382 1383 ret = misc_register(&ucma_misc); 1384 if (ret) 1385 return ret; 1386 1387 ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version); 1388 if (ret) { 1389 printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n"); 1390 goto err1; 1391 } 1392 1393 ucma_ctl_table_hdr = register_sysctl_paths(ucma_ctl_path, ucma_ctl_table); 1394 if (!ucma_ctl_table_hdr) { 1395 printk(KERN_ERR "rdma_ucm: couldn't register sysctl paths\n"); 1396 ret = -ENOMEM; 1397 goto err2; 1398 } 1399 return 0; 1400 err2: 1401 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version); 1402 err1: 1403 misc_deregister(&ucma_misc); 1404 return ret; 1405 } 1406 1407 static void __exit ucma_cleanup(void) 1408 { 1409 unregister_sysctl_table(ucma_ctl_table_hdr); 1410 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version); 1411 misc_deregister(&ucma_misc); 1412 idr_destroy(&ctx_idr); 1413 } 1414 1415 module_init(ucma_init); 1416 module_exit(ucma_cleanup); 1417