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 51MODULE_AUTHOR("Sean Hefty"); 52MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access"); 53MODULE_LICENSE("Dual BSD/GPL"); 54 55static unsigned int max_backlog = 1024; 56 57static struct ctl_table_header *ucma_ctl_table_hdr; 58static 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 69static struct ctl_path ucma_ctl_path[] = { 70 { .procname = "net" }, 71 { .procname = "rdma_ucm" }, 72 { } 73}; 74 75struct 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 83struct 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 98struct 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 108struct 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 116static DEFINE_MUTEX(mut); 117static DEFINE_IDR(ctx_idr); 118static DEFINE_IDR(multicast_idr); 119 120static 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 133static 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 145static void ucma_put_ctx(struct ucma_context *ctx) 146{ 147 if (atomic_dec_and_test(&ctx->ref)) 148 complete(&ctx->comp); 149} 150 151static 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 181error: 182 kfree(ctx); 183 return NULL; 184} 185 186static 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 212error: 213 kfree(mc); 214 return NULL; 215} 216 217static 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 233static 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 245static 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 265static 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); 307out: 308 mutex_unlock(&ctx->file->mut); 309 return ret; 310} 311 312static 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); 366done: 367 mutex_unlock(&file->mut); 368 return ret; 369} 370 371static 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 389static 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 429err2: 430 rdma_destroy_id(ctx->cm_id); 431err1: 432 mutex_lock(&mut); 433 idr_remove(&ctx_idr, ctx->id); 434 mutex_unlock(&mut); 435 kfree(ctx); 436 return ret; 437} 438 439static 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 452static void ucma_cleanup_mc_events(struct ucma_multicast *mc) 453{ 454 struct ucma_event *uevent, *tmp; 455 456 list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) { 457 if (uevent->mc != mc) 458 continue; 459 460 list_del(&uevent->list); 461 kfree(uevent); 462 } 463} 464 465/* 466 * We cannot hold file->mut when calling rdma_destroy_id() or we can 467 * deadlock. We also acquire file->mut in ucma_event_handler(), and 468 * rdma_destroy_id() will wait until all callbacks have completed. 469 */ 470static int ucma_free_ctx(struct ucma_context *ctx) 471{ 472 int events_reported; 473 struct ucma_event *uevent, *tmp; 474 LIST_HEAD(list); 475 476 /* No new events will be generated after destroying the id. */ 477 rdma_destroy_id(ctx->cm_id); 478 479 ucma_cleanup_multicast(ctx); 480 481 /* Cleanup events not yet reported to the user. */ 482 mutex_lock(&ctx->file->mut); 483 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) { 484 if (uevent->ctx == ctx) 485 list_move_tail(&uevent->list, &list); 486 } 487 list_del(&ctx->list); 488 mutex_unlock(&ctx->file->mut); 489 490 list_for_each_entry_safe(uevent, tmp, &list, list) { 491 list_del(&uevent->list); 492 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) 493 rdma_destroy_id(uevent->cm_id); 494 kfree(uevent); 495 } 496 497 events_reported = ctx->events_reported; 498 kfree(ctx); 499 return events_reported; 500} 501 502static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf, 503 int in_len, int out_len) 504{ 505 struct rdma_ucm_destroy_id cmd; 506 struct rdma_ucm_destroy_id_resp resp; 507 struct ucma_context *ctx; 508 int ret = 0; 509 510 if (out_len < sizeof(resp)) 511 return -ENOSPC; 512 513 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 514 return -EFAULT; 515 516 mutex_lock(&mut); 517 ctx = _ucma_find_context(cmd.id, file); 518 if (!IS_ERR(ctx)) 519 idr_remove(&ctx_idr, ctx->id); 520 mutex_unlock(&mut); 521 522 if (IS_ERR(ctx)) 523 return PTR_ERR(ctx); 524 525 ucma_put_ctx(ctx); 526 wait_for_completion(&ctx->comp); 527 resp.events_reported = ucma_free_ctx(ctx); 528 529 if (copy_to_user((void __user *)(unsigned long)cmd.response, 530 &resp, sizeof(resp))) 531 ret = -EFAULT; 532 533 return ret; 534} 535 536static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf, 537 int in_len, int out_len) 538{ 539 struct rdma_ucm_bind_addr cmd; 540 struct ucma_context *ctx; 541 int ret; 542 543 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 544 return -EFAULT; 545 546 ctx = ucma_get_ctx(file, cmd.id); 547 if (IS_ERR(ctx)) 548 return PTR_ERR(ctx); 549 550 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr); 551 ucma_put_ctx(ctx); 552 return ret; 553} 554 555static ssize_t ucma_resolve_addr(struct ucma_file *file, 556 const char __user *inbuf, 557 int in_len, int out_len) 558{ 559 struct rdma_ucm_resolve_addr cmd; 560 struct ucma_context *ctx; 561 int ret; 562 563 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 564 return -EFAULT; 565 566 ctx = ucma_get_ctx(file, cmd.id); 567 if (IS_ERR(ctx)) 568 return PTR_ERR(ctx); 569 570 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr, 571 (struct sockaddr *) &cmd.dst_addr, 572 cmd.timeout_ms); 573 ucma_put_ctx(ctx); 574 return ret; 575} 576 577static ssize_t ucma_resolve_route(struct ucma_file *file, 578 const char __user *inbuf, 579 int in_len, int out_len) 580{ 581 struct rdma_ucm_resolve_route cmd; 582 struct ucma_context *ctx; 583 int ret; 584 585 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 586 return -EFAULT; 587 588 ctx = ucma_get_ctx(file, cmd.id); 589 if (IS_ERR(ctx)) 590 return PTR_ERR(ctx); 591 592 ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms); 593 ucma_put_ctx(ctx); 594 return ret; 595} 596 597static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp, 598 struct rdma_route *route) 599{ 600 struct rdma_dev_addr *dev_addr; 601 602 resp->num_paths = route->num_paths; 603 switch (route->num_paths) { 604 case 0: 605 dev_addr = &route->addr.dev_addr; 606 rdma_addr_get_dgid(dev_addr, 607 (union ib_gid *) &resp->ib_route[0].dgid); 608 rdma_addr_get_sgid(dev_addr, 609 (union ib_gid *) &resp->ib_route[0].sgid); 610 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr)); 611 break; 612 case 2: 613 ib_copy_path_rec_to_user(&resp->ib_route[1], 614 &route->path_rec[1]); 615 /* fall through */ 616 case 1: 617 ib_copy_path_rec_to_user(&resp->ib_route[0], 618 &route->path_rec[0]); 619 break; 620 default: 621 break; 622 } 623} 624 625static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp, 626 struct rdma_route *route) 627{ 628 struct rdma_dev_addr *dev_addr; 629 struct net_device *dev; 630 u16 vid = 0; 631 632 resp->num_paths = route->num_paths; 633 switch (route->num_paths) { 634 case 0: 635 dev_addr = &route->addr.dev_addr; 636 dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if); 637 if (dev) { 638 vid = rdma_vlan_dev_vlan_id(dev); 639 dev_put(dev); 640 } 641 642 iboe_mac_vlan_to_ll((union ib_gid *) &resp->ib_route[0].dgid, 643 dev_addr->dst_dev_addr, vid); 644 iboe_addr_get_sgid(dev_addr, 645 (union ib_gid *) &resp->ib_route[0].sgid); 646 resp->ib_route[0].pkey = cpu_to_be16(0xffff); 647 break; 648 case 2: 649 ib_copy_path_rec_to_user(&resp->ib_route[1], 650 &route->path_rec[1]); 651 /* fall through */ 652 case 1: 653 ib_copy_path_rec_to_user(&resp->ib_route[0], 654 &route->path_rec[0]); 655 break; 656 default: 657 break; 658 } 659} 660 661static void ucma_copy_iw_route(struct rdma_ucm_query_route_resp *resp, 662 struct rdma_route *route) 663{ 664 struct rdma_dev_addr *dev_addr; 665 666 dev_addr = &route->addr.dev_addr; 667 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &resp->ib_route[0].dgid); 668 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &resp->ib_route[0].sgid); 669} 670 671static ssize_t ucma_query_route(struct ucma_file *file, 672 const char __user *inbuf, 673 int in_len, int out_len) 674{ 675 struct rdma_ucm_query_route cmd; 676 struct rdma_ucm_query_route_resp resp; 677 struct ucma_context *ctx; 678 struct sockaddr *addr; 679 int ret = 0; 680 681 if (out_len < sizeof(resp)) 682 return -ENOSPC; 683 684 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 685 return -EFAULT; 686 687 ctx = ucma_get_ctx(file, cmd.id); 688 if (IS_ERR(ctx)) 689 return PTR_ERR(ctx); 690 691 memset(&resp, 0, sizeof resp); 692 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr; 693 memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ? 694 sizeof(struct sockaddr_in) : 695 sizeof(struct sockaddr_in6)); 696 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr; 697 memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ? 698 sizeof(struct sockaddr_in) : 699 sizeof(struct sockaddr_in6)); 700 if (!ctx->cm_id->device) 701 goto out; 702 703 resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid; 704 resp.port_num = ctx->cm_id->port_num; 705 switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) { 706 case RDMA_TRANSPORT_IB: 707 switch (rdma_port_get_link_layer(ctx->cm_id->device, 708 ctx->cm_id->port_num)) { 709 case IB_LINK_LAYER_INFINIBAND: 710 ucma_copy_ib_route(&resp, &ctx->cm_id->route); 711 break; 712 case IB_LINK_LAYER_ETHERNET: 713 ucma_copy_iboe_route(&resp, &ctx->cm_id->route); 714 break; 715 default: 716 break; 717 } 718 break; 719 case RDMA_TRANSPORT_IWARP: 720 ucma_copy_iw_route(&resp, &ctx->cm_id->route); 721 break; 722 default: 723 break; 724 } 725 726out: 727 if (copy_to_user((void __user *)(unsigned long)cmd.response, 728 &resp, sizeof(resp))) 729 ret = -EFAULT; 730 731 ucma_put_ctx(ctx); 732 return ret; 733} 734 735static void ucma_copy_conn_param(struct rdma_conn_param *dst, 736 struct rdma_ucm_conn_param *src) 737{ 738 dst->private_data = src->private_data; 739 dst->private_data_len = src->private_data_len; 740 dst->responder_resources =src->responder_resources; 741 dst->initiator_depth = src->initiator_depth; 742 dst->flow_control = src->flow_control; 743 dst->retry_count = src->retry_count; 744 dst->rnr_retry_count = src->rnr_retry_count; 745 dst->srq = src->srq; 746 dst->qp_num = src->qp_num; 747} 748 749static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf, 750 int in_len, int out_len) 751{ 752 struct rdma_ucm_connect cmd; 753 struct rdma_conn_param conn_param; 754 struct ucma_context *ctx; 755 int ret; 756 757 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 758 return -EFAULT; 759 760 if (!cmd.conn_param.valid) 761 return -EINVAL; 762 763 ctx = ucma_get_ctx(file, cmd.id); 764 if (IS_ERR(ctx)) 765 return PTR_ERR(ctx); 766 767 ucma_copy_conn_param(&conn_param, &cmd.conn_param); 768 ret = rdma_connect(ctx->cm_id, &conn_param); 769 ucma_put_ctx(ctx); 770 return ret; 771} 772 773static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf, 774 int in_len, int out_len) 775{ 776 struct rdma_ucm_listen cmd; 777 struct ucma_context *ctx; 778 int ret; 779 780 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 781 return -EFAULT; 782 783 ctx = ucma_get_ctx(file, cmd.id); 784 if (IS_ERR(ctx)) 785 return PTR_ERR(ctx); 786 787 ctx->backlog = cmd.backlog > 0 && cmd.backlog < max_backlog ? 788 cmd.backlog : max_backlog; 789 ret = rdma_listen(ctx->cm_id, ctx->backlog); 790 ucma_put_ctx(ctx); 791 return ret; 792} 793 794static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf, 795 int in_len, int out_len) 796{ 797 struct rdma_ucm_accept cmd; 798 struct rdma_conn_param conn_param; 799 struct ucma_context *ctx; 800 int ret; 801 802 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 803 return -EFAULT; 804 805 ctx = ucma_get_ctx(file, cmd.id); 806 if (IS_ERR(ctx)) 807 return PTR_ERR(ctx); 808 809 if (cmd.conn_param.valid) { 810 ucma_copy_conn_param(&conn_param, &cmd.conn_param); 811 mutex_lock(&file->mut); 812 ret = rdma_accept(ctx->cm_id, &conn_param); 813 if (!ret) 814 ctx->uid = cmd.uid; 815 mutex_unlock(&file->mut); 816 } else 817 ret = rdma_accept(ctx->cm_id, NULL); 818 819 ucma_put_ctx(ctx); 820 return ret; 821} 822 823static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf, 824 int in_len, int out_len) 825{ 826 struct rdma_ucm_reject cmd; 827 struct ucma_context *ctx; 828 int ret; 829 830 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 831 return -EFAULT; 832 833 ctx = ucma_get_ctx(file, cmd.id); 834 if (IS_ERR(ctx)) 835 return PTR_ERR(ctx); 836 837 ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len); 838 ucma_put_ctx(ctx); 839 return ret; 840} 841 842static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf, 843 int in_len, int out_len) 844{ 845 struct rdma_ucm_disconnect cmd; 846 struct ucma_context *ctx; 847 int ret; 848 849 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 850 return -EFAULT; 851 852 ctx = ucma_get_ctx(file, cmd.id); 853 if (IS_ERR(ctx)) 854 return PTR_ERR(ctx); 855 856 ret = rdma_disconnect(ctx->cm_id); 857 ucma_put_ctx(ctx); 858 return ret; 859} 860 861static ssize_t ucma_init_qp_attr(struct ucma_file *file, 862 const char __user *inbuf, 863 int in_len, int out_len) 864{ 865 struct rdma_ucm_init_qp_attr cmd; 866 struct ib_uverbs_qp_attr resp; 867 struct ucma_context *ctx; 868 struct ib_qp_attr qp_attr; 869 int ret; 870 871 if (out_len < sizeof(resp)) 872 return -ENOSPC; 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 resp.qp_attr_mask = 0; 882 memset(&qp_attr, 0, sizeof qp_attr); 883 qp_attr.qp_state = cmd.qp_state; 884 ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask); 885 if (ret) 886 goto out; 887 888 ib_copy_qp_attr_to_user(&resp, &qp_attr); 889 if (copy_to_user((void __user *)(unsigned long)cmd.response, 890 &resp, sizeof(resp))) 891 ret = -EFAULT; 892 893out: 894 ucma_put_ctx(ctx); 895 return ret; 896} 897 898static int ucma_set_option_id(struct ucma_context *ctx, int optname, 899 void *optval, size_t optlen) 900{ 901 int ret = 0; 902 903 switch (optname) { 904 case RDMA_OPTION_ID_TOS: 905 if (optlen != sizeof(u8)) { 906 ret = -EINVAL; 907 break; 908 } 909 rdma_set_service_type(ctx->cm_id, *((u8 *) optval)); 910 break; 911 case RDMA_OPTION_ID_REUSEADDR: 912 if (optlen != sizeof(int)) { 913 ret = -EINVAL; 914 break; 915 } 916 ret = rdma_set_reuseaddr(ctx->cm_id, *((int *) optval) ? 1 : 0); 917 break; 918 default: 919 ret = -ENOSYS; 920 } 921 922 return ret; 923} 924 925static int ucma_set_ib_path(struct ucma_context *ctx, 926 struct ib_path_rec_data *path_data, size_t optlen) 927{ 928 struct ib_sa_path_rec sa_path; 929 struct rdma_cm_event event; 930 int ret; 931 932 if (optlen % sizeof(*path_data)) 933 return -EINVAL; 934 935 for (; optlen; optlen -= sizeof(*path_data), path_data++) { 936 if (path_data->flags == (IB_PATH_GMP | IB_PATH_PRIMARY | 937 IB_PATH_BIDIRECTIONAL)) 938 break; 939 } 940 941 if (!optlen) 942 return -EINVAL; 943 944 ib_sa_unpack_path(path_data->path_rec, &sa_path); 945 ret = rdma_set_ib_paths(ctx->cm_id, &sa_path, 1); 946 if (ret) 947 return ret; 948 949 memset(&event, 0, sizeof event); 950 event.event = RDMA_CM_EVENT_ROUTE_RESOLVED; 951 return ucma_event_handler(ctx->cm_id, &event); 952} 953 954static int ucma_set_option_ib(struct ucma_context *ctx, int optname, 955 void *optval, size_t optlen) 956{ 957 int ret; 958 959 switch (optname) { 960 case RDMA_OPTION_IB_PATH: 961 ret = ucma_set_ib_path(ctx, optval, optlen); 962 break; 963 default: 964 ret = -ENOSYS; 965 } 966 967 return ret; 968} 969 970static int ucma_set_option_level(struct ucma_context *ctx, int level, 971 int optname, void *optval, size_t optlen) 972{ 973 int ret; 974 975 switch (level) { 976 case RDMA_OPTION_ID: 977 ret = ucma_set_option_id(ctx, optname, optval, optlen); 978 break; 979 case RDMA_OPTION_IB: 980 ret = ucma_set_option_ib(ctx, optname, optval, optlen); 981 break; 982 default: 983 ret = -ENOSYS; 984 } 985 986 return ret; 987} 988 989static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf, 990 int in_len, int out_len) 991{ 992 struct rdma_ucm_set_option cmd; 993 struct ucma_context *ctx; 994 void *optval; 995 int ret; 996 997 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 998 return -EFAULT; 999 1000 ctx = ucma_get_ctx(file, cmd.id); 1001 if (IS_ERR(ctx)) 1002 return PTR_ERR(ctx); 1003 1004 optval = kmalloc(cmd.optlen, GFP_KERNEL); 1005 if (!optval) { 1006 ret = -ENOMEM; 1007 goto out1; 1008 } 1009 1010 if (copy_from_user(optval, (void __user *) (unsigned long) cmd.optval, 1011 cmd.optlen)) { 1012 ret = -EFAULT; 1013 goto out2; 1014 } 1015 1016 ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval, 1017 cmd.optlen); 1018out2: 1019 kfree(optval); 1020out1: 1021 ucma_put_ctx(ctx); 1022 return ret; 1023} 1024 1025static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf, 1026 int in_len, int out_len) 1027{ 1028 struct rdma_ucm_notify cmd; 1029 struct ucma_context *ctx; 1030 int ret; 1031 1032 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 1033 return -EFAULT; 1034 1035 ctx = ucma_get_ctx(file, cmd.id); 1036 if (IS_ERR(ctx)) 1037 return PTR_ERR(ctx); 1038 1039 ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event); 1040 ucma_put_ctx(ctx); 1041 return ret; 1042} 1043 1044static ssize_t ucma_join_multicast(struct ucma_file *file, 1045 const char __user *inbuf, 1046 int in_len, int out_len) 1047{ 1048 struct rdma_ucm_join_mcast cmd; 1049 struct rdma_ucm_create_id_resp resp; 1050 struct ucma_context *ctx; 1051 struct ucma_multicast *mc; 1052 int ret; 1053 1054 if (out_len < sizeof(resp)) 1055 return -ENOSPC; 1056 1057 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 1058 return -EFAULT; 1059 1060 ctx = ucma_get_ctx(file, cmd.id); 1061 if (IS_ERR(ctx)) 1062 return PTR_ERR(ctx); 1063 1064 mutex_lock(&file->mut); 1065 mc = ucma_alloc_multicast(ctx); 1066 if (!mc) { 1067 ret = -ENOMEM; 1068 goto err1; 1069 } 1070 1071 mc->uid = cmd.uid; 1072 memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr); 1073 ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr, mc); 1074 if (ret) 1075 goto err2; 1076 1077 resp.id = mc->id; 1078 if (copy_to_user((void __user *)(unsigned long)cmd.response, 1079 &resp, sizeof(resp))) { 1080 ret = -EFAULT; 1081 goto err3; 1082 } 1083 1084 mutex_unlock(&file->mut); 1085 ucma_put_ctx(ctx); 1086 return 0; 1087 1088err3: 1089 rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr); 1090 ucma_cleanup_mc_events(mc); 1091err2: 1092 mutex_lock(&mut); 1093 idr_remove(&multicast_idr, mc->id); 1094 mutex_unlock(&mut); 1095 list_del(&mc->list); 1096 kfree(mc); 1097err1: 1098 mutex_unlock(&file->mut); 1099 ucma_put_ctx(ctx); 1100 return ret; 1101} 1102 1103static ssize_t ucma_leave_multicast(struct ucma_file *file, 1104 const char __user *inbuf, 1105 int in_len, int out_len) 1106{ 1107 struct rdma_ucm_destroy_id cmd; 1108 struct rdma_ucm_destroy_id_resp resp; 1109 struct ucma_multicast *mc; 1110 int ret = 0; 1111 1112 if (out_len < sizeof(resp)) 1113 return -ENOSPC; 1114 1115 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 1116 return -EFAULT; 1117 1118 mutex_lock(&mut); 1119 mc = idr_find(&multicast_idr, cmd.id); 1120 if (!mc) 1121 mc = ERR_PTR(-ENOENT); 1122 else if (mc->ctx->file != file) 1123 mc = ERR_PTR(-EINVAL); 1124 else { 1125 idr_remove(&multicast_idr, mc->id); 1126 atomic_inc(&mc->ctx->ref); 1127 } 1128 mutex_unlock(&mut); 1129 1130 if (IS_ERR(mc)) { 1131 ret = PTR_ERR(mc); 1132 goto out; 1133 } 1134 1135 rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr); 1136 mutex_lock(&mc->ctx->file->mut); 1137 ucma_cleanup_mc_events(mc); 1138 list_del(&mc->list); 1139 mutex_unlock(&mc->ctx->file->mut); 1140 1141 ucma_put_ctx(mc->ctx); 1142 resp.events_reported = mc->events_reported; 1143 kfree(mc); 1144 1145 if (copy_to_user((void __user *)(unsigned long)cmd.response, 1146 &resp, sizeof(resp))) 1147 ret = -EFAULT; 1148out: 1149 return ret; 1150} 1151 1152static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2) 1153{ 1154 /* Acquire mutex's based on pointer comparison to prevent deadlock. */ 1155 if (file1 < file2) { 1156 mutex_lock(&file1->mut); 1157 mutex_lock(&file2->mut); 1158 } else { 1159 mutex_lock(&file2->mut); 1160 mutex_lock(&file1->mut); 1161 } 1162} 1163 1164static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2) 1165{ 1166 if (file1 < file2) { 1167 mutex_unlock(&file2->mut); 1168 mutex_unlock(&file1->mut); 1169 } else { 1170 mutex_unlock(&file1->mut); 1171 mutex_unlock(&file2->mut); 1172 } 1173} 1174 1175static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file) 1176{ 1177 struct ucma_event *uevent, *tmp; 1178 1179 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) 1180 if (uevent->ctx == ctx) 1181 list_move_tail(&uevent->list, &file->event_list); 1182} 1183 1184static ssize_t ucma_migrate_id(struct ucma_file *new_file, 1185 const char __user *inbuf, 1186 int in_len, int out_len) 1187{ 1188 struct rdma_ucm_migrate_id cmd; 1189 struct rdma_ucm_migrate_resp resp; 1190 struct ucma_context *ctx; 1191 struct file *filp; 1192 struct ucma_file *cur_file; 1193 int ret = 0; 1194 1195 if (copy_from_user(&cmd, inbuf, sizeof(cmd))) 1196 return -EFAULT; 1197 1198 /* Get current fd to protect against it being closed */ 1199 filp = fget(cmd.fd); 1200 if (!filp) 1201 return -ENOENT; 1202 1203 /* Validate current fd and prevent destruction of id. */ 1204 ctx = ucma_get_ctx(filp->private_data, cmd.id); 1205 if (IS_ERR(ctx)) { 1206 ret = PTR_ERR(ctx); 1207 goto file_put; 1208 } 1209 1210 cur_file = ctx->file; 1211 if (cur_file == new_file) { 1212 resp.events_reported = ctx->events_reported; 1213 goto response; 1214 } 1215 1216 /* 1217 * Migrate events between fd's, maintaining order, and avoiding new 1218 * events being added before existing events. 1219 */ 1220 ucma_lock_files(cur_file, new_file); 1221 mutex_lock(&mut); 1222 1223 list_move_tail(&ctx->list, &new_file->ctx_list); 1224 ucma_move_events(ctx, new_file); 1225 ctx->file = new_file; 1226 resp.events_reported = ctx->events_reported; 1227 1228 mutex_unlock(&mut); 1229 ucma_unlock_files(cur_file, new_file); 1230 1231response: 1232 if (copy_to_user((void __user *)(unsigned long)cmd.response, 1233 &resp, sizeof(resp))) 1234 ret = -EFAULT; 1235 1236 ucma_put_ctx(ctx); 1237file_put: 1238 fput(filp); 1239 return ret; 1240} 1241 1242static ssize_t (*ucma_cmd_table[])(struct ucma_file *file, 1243 const char __user *inbuf, 1244 int in_len, int out_len) = { 1245 [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id, 1246 [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id, 1247 [RDMA_USER_CM_CMD_BIND_ADDR] = ucma_bind_addr, 1248 [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr, 1249 [RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route, 1250 [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route, 1251 [RDMA_USER_CM_CMD_CONNECT] = ucma_connect, 1252 [RDMA_USER_CM_CMD_LISTEN] = ucma_listen, 1253 [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept, 1254 [RDMA_USER_CM_CMD_REJECT] = ucma_reject, 1255 [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect, 1256 [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr, 1257 [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event, 1258 [RDMA_USER_CM_CMD_GET_OPTION] = NULL, 1259 [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option, 1260 [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify, 1261 [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast, 1262 [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast, 1263 [RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id 1264}; 1265 1266static ssize_t ucma_write(struct file *filp, const char __user *buf, 1267 size_t len, loff_t *pos) 1268{ 1269 struct ucma_file *file = filp->private_data; 1270 struct rdma_ucm_cmd_hdr hdr; 1271 ssize_t ret; 1272 1273 if (len < sizeof(hdr)) 1274 return -EINVAL; 1275 1276 if (copy_from_user(&hdr, buf, sizeof(hdr))) 1277 return -EFAULT; 1278 1279 if (hdr.cmd >= ARRAY_SIZE(ucma_cmd_table)) 1280 return -EINVAL; 1281 1282 if (hdr.in + sizeof(hdr) > len) 1283 return -EINVAL; 1284 1285 if (!ucma_cmd_table[hdr.cmd]) 1286 return -ENOSYS; 1287 1288 ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out); 1289 if (!ret) 1290 ret = len; 1291 1292 return ret; 1293} 1294 1295static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait) 1296{ 1297 struct ucma_file *file = filp->private_data; 1298 unsigned int mask = 0; 1299 1300 poll_wait(filp, &file->poll_wait, wait); 1301 1302 if (!list_empty(&file->event_list)) 1303 mask = POLLIN | POLLRDNORM; 1304 1305 return mask; 1306} 1307 1308/* 1309 * ucma_open() does not need the BKL: 1310 * 1311 * - no global state is referred to; 1312 * - there is no ioctl method to race against; 1313 * - no further module initialization is required for open to work 1314 * after the device is registered. 1315 */ 1316static int ucma_open(struct inode *inode, struct file *filp) 1317{ 1318 struct ucma_file *file; 1319 1320 file = kmalloc(sizeof *file, GFP_KERNEL); 1321 if (!file) 1322 return -ENOMEM; 1323 1324 INIT_LIST_HEAD(&file->event_list); 1325 INIT_LIST_HEAD(&file->ctx_list); 1326 init_waitqueue_head(&file->poll_wait); 1327 mutex_init(&file->mut); 1328 1329 filp->private_data = file; 1330 file->filp = filp; 1331 1332 return nonseekable_open(inode, filp); 1333} 1334 1335static int ucma_close(struct inode *inode, struct file *filp) 1336{ 1337 struct ucma_file *file = filp->private_data; 1338 struct ucma_context *ctx, *tmp; 1339 1340 mutex_lock(&file->mut); 1341 list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) { 1342 mutex_unlock(&file->mut); 1343 1344 mutex_lock(&mut); 1345 idr_remove(&ctx_idr, ctx->id); 1346 mutex_unlock(&mut); 1347 1348 ucma_free_ctx(ctx); 1349 mutex_lock(&file->mut); 1350 } 1351 mutex_unlock(&file->mut); 1352 kfree(file); 1353 return 0; 1354} 1355 1356static const struct file_operations ucma_fops = { 1357 .owner = THIS_MODULE, 1358 .open = ucma_open, 1359 .release = ucma_close, 1360 .write = ucma_write, 1361 .poll = ucma_poll, 1362 .llseek = no_llseek, 1363}; 1364 1365static struct miscdevice ucma_misc = { 1366 .minor = MISC_DYNAMIC_MINOR, 1367 .name = "rdma_cm", 1368 .nodename = "infiniband/rdma_cm", 1369 .mode = 0666, 1370 .fops = &ucma_fops, 1371}; 1372 1373static ssize_t show_abi_version(struct device *dev, 1374 struct device_attribute *attr, 1375 char *buf) 1376{ 1377 return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION); 1378} 1379static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL); 1380 1381static int __init ucma_init(void) 1382{ 1383 int ret; 1384 1385 ret = misc_register(&ucma_misc); 1386 if (ret) 1387 return ret; 1388 1389 ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version); 1390 if (ret) { 1391 printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n"); 1392 goto err1; 1393 } 1394 1395 ucma_ctl_table_hdr = register_sysctl_paths(ucma_ctl_path, ucma_ctl_table); 1396 if (!ucma_ctl_table_hdr) { 1397 printk(KERN_ERR "rdma_ucm: couldn't register sysctl paths\n"); 1398 ret = -ENOMEM; 1399 goto err2; 1400 } 1401 return 0; 1402err2: 1403 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version); 1404err1: 1405 misc_deregister(&ucma_misc); 1406 return ret; 1407} 1408 1409static void __exit ucma_cleanup(void) 1410{ 1411 unregister_sysctl_table(ucma_ctl_table_hdr); 1412 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version); 1413 misc_deregister(&ucma_misc); 1414 idr_destroy(&ctx_idr); 1415} 1416 1417module_init(ucma_init); 1418module_exit(ucma_cleanup); 1419