1 /* 2 * Copyright (c) 2004 Topspin Communications. All rights reserved. 3 * Copyright (c) 2005 Voltaire, Inc. All rights reserved. 4 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. 5 * Copyright (c) 2008 Cisco. All rights reserved. 6 * 7 * This software is available to you under a choice of one of two 8 * licenses. You may choose to be licensed under the terms of the GNU 9 * General Public License (GPL) Version 2, available from the file 10 * COPYING in the main directory of this source tree, or the 11 * OpenIB.org BSD license below: 12 * 13 * Redistribution and use in source and binary forms, with or 14 * without modification, are permitted provided that the following 15 * conditions are met: 16 * 17 * - Redistributions of source code must retain the above 18 * copyright notice, this list of conditions and the following 19 * disclaimer. 20 * 21 * - Redistributions in binary form must reproduce the above 22 * copyright notice, this list of conditions and the following 23 * disclaimer in the documentation and/or other materials 24 * provided with the distribution. 25 * 26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 33 * SOFTWARE. 34 */ 35 36 #define pr_fmt(fmt) "user_mad: " fmt 37 38 #include <linux/module.h> 39 #include <linux/init.h> 40 #include <linux/device.h> 41 #include <linux/err.h> 42 #include <linux/fs.h> 43 #include <linux/cdev.h> 44 #include <linux/dma-mapping.h> 45 #include <linux/poll.h> 46 #include <linux/mutex.h> 47 #include <linux/kref.h> 48 #include <linux/compat.h> 49 #include <linux/sched.h> 50 #include <linux/semaphore.h> 51 #include <linux/slab.h> 52 53 #include <linux/uaccess.h> 54 55 #include <rdma/ib_mad.h> 56 #include <rdma/ib_user_mad.h> 57 58 #include "core_priv.h" 59 60 MODULE_AUTHOR("Roland Dreier"); 61 MODULE_DESCRIPTION("InfiniBand userspace MAD packet access"); 62 MODULE_LICENSE("Dual BSD/GPL"); 63 64 enum { 65 IB_UMAD_MAX_PORTS = RDMA_MAX_PORTS, 66 IB_UMAD_MAX_AGENTS = 32, 67 68 IB_UMAD_MAJOR = 231, 69 IB_UMAD_MINOR_BASE = 0, 70 IB_UMAD_NUM_FIXED_MINOR = 64, 71 IB_UMAD_NUM_DYNAMIC_MINOR = IB_UMAD_MAX_PORTS - IB_UMAD_NUM_FIXED_MINOR, 72 IB_ISSM_MINOR_BASE = IB_UMAD_NUM_FIXED_MINOR, 73 }; 74 75 /* 76 * Our lifetime rules for these structs are the following: 77 * device special file is opened, we take a reference on the 78 * ib_umad_port's struct ib_umad_device. We drop these 79 * references in the corresponding close(). 80 * 81 * In addition to references coming from open character devices, there 82 * is one more reference to each ib_umad_device representing the 83 * module's reference taken when allocating the ib_umad_device in 84 * ib_umad_add_one(). 85 * 86 * When destroying an ib_umad_device, we drop the module's reference. 87 */ 88 89 struct ib_umad_port { 90 struct cdev cdev; 91 struct device dev; 92 struct cdev sm_cdev; 93 struct device sm_dev; 94 struct semaphore sm_sem; 95 96 struct mutex file_mutex; 97 struct list_head file_list; 98 99 struct ib_device *ib_dev; 100 struct ib_umad_device *umad_dev; 101 int dev_num; 102 u8 port_num; 103 }; 104 105 struct ib_umad_device { 106 struct kref kref; 107 struct ib_umad_port ports[]; 108 }; 109 110 struct ib_umad_file { 111 struct mutex mutex; 112 struct ib_umad_port *port; 113 struct list_head recv_list; 114 struct list_head send_list; 115 struct list_head port_list; 116 spinlock_t send_lock; 117 wait_queue_head_t recv_wait; 118 struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS]; 119 int agents_dead; 120 u8 use_pkey_index; 121 u8 already_used; 122 }; 123 124 struct ib_umad_packet { 125 struct ib_mad_send_buf *msg; 126 struct ib_mad_recv_wc *recv_wc; 127 struct list_head list; 128 int length; 129 struct ib_user_mad mad; 130 }; 131 132 static const dev_t base_umad_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE); 133 static const dev_t base_issm_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE) + 134 IB_UMAD_NUM_FIXED_MINOR; 135 static dev_t dynamic_umad_dev; 136 static dev_t dynamic_issm_dev; 137 138 static DEFINE_IDA(umad_ida); 139 140 static void ib_umad_add_one(struct ib_device *device); 141 static void ib_umad_remove_one(struct ib_device *device, void *client_data); 142 143 static void ib_umad_dev_free(struct kref *kref) 144 { 145 struct ib_umad_device *dev = 146 container_of(kref, struct ib_umad_device, kref); 147 148 kfree(dev); 149 } 150 151 static void ib_umad_dev_get(struct ib_umad_device *dev) 152 { 153 kref_get(&dev->kref); 154 } 155 156 static void ib_umad_dev_put(struct ib_umad_device *dev) 157 { 158 kref_put(&dev->kref, ib_umad_dev_free); 159 } 160 161 static int hdr_size(struct ib_umad_file *file) 162 { 163 return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) : 164 sizeof (struct ib_user_mad_hdr_old); 165 } 166 167 /* caller must hold file->mutex */ 168 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id) 169 { 170 return file->agents_dead ? NULL : file->agent[id]; 171 } 172 173 static int queue_packet(struct ib_umad_file *file, 174 struct ib_mad_agent *agent, 175 struct ib_umad_packet *packet) 176 { 177 int ret = 1; 178 179 mutex_lock(&file->mutex); 180 181 for (packet->mad.hdr.id = 0; 182 packet->mad.hdr.id < IB_UMAD_MAX_AGENTS; 183 packet->mad.hdr.id++) 184 if (agent == __get_agent(file, packet->mad.hdr.id)) { 185 list_add_tail(&packet->list, &file->recv_list); 186 wake_up_interruptible(&file->recv_wait); 187 ret = 0; 188 break; 189 } 190 191 mutex_unlock(&file->mutex); 192 193 return ret; 194 } 195 196 static void dequeue_send(struct ib_umad_file *file, 197 struct ib_umad_packet *packet) 198 { 199 spin_lock_irq(&file->send_lock); 200 list_del(&packet->list); 201 spin_unlock_irq(&file->send_lock); 202 } 203 204 static void send_handler(struct ib_mad_agent *agent, 205 struct ib_mad_send_wc *send_wc) 206 { 207 struct ib_umad_file *file = agent->context; 208 struct ib_umad_packet *packet = send_wc->send_buf->context[0]; 209 210 dequeue_send(file, packet); 211 rdma_destroy_ah(packet->msg->ah, RDMA_DESTROY_AH_SLEEPABLE); 212 ib_free_send_mad(packet->msg); 213 214 if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) { 215 packet->length = IB_MGMT_MAD_HDR; 216 packet->mad.hdr.status = ETIMEDOUT; 217 if (!queue_packet(file, agent, packet)) 218 return; 219 } 220 kfree(packet); 221 } 222 223 static void recv_handler(struct ib_mad_agent *agent, 224 struct ib_mad_send_buf *send_buf, 225 struct ib_mad_recv_wc *mad_recv_wc) 226 { 227 struct ib_umad_file *file = agent->context; 228 struct ib_umad_packet *packet; 229 230 if (mad_recv_wc->wc->status != IB_WC_SUCCESS) 231 goto err1; 232 233 packet = kzalloc(sizeof *packet, GFP_KERNEL); 234 if (!packet) 235 goto err1; 236 237 packet->length = mad_recv_wc->mad_len; 238 packet->recv_wc = mad_recv_wc; 239 240 packet->mad.hdr.status = 0; 241 packet->mad.hdr.length = hdr_size(file) + mad_recv_wc->mad_len; 242 packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp); 243 /* 244 * On OPA devices it is okay to lose the upper 16 bits of LID as this 245 * information is obtained elsewhere. Mask off the upper 16 bits. 246 */ 247 if (rdma_cap_opa_mad(agent->device, agent->port_num)) 248 packet->mad.hdr.lid = ib_lid_be16(0xFFFF & 249 mad_recv_wc->wc->slid); 250 else 251 packet->mad.hdr.lid = ib_lid_be16(mad_recv_wc->wc->slid); 252 packet->mad.hdr.sl = mad_recv_wc->wc->sl; 253 packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits; 254 packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index; 255 packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH); 256 if (packet->mad.hdr.grh_present) { 257 struct rdma_ah_attr ah_attr; 258 const struct ib_global_route *grh; 259 int ret; 260 261 ret = ib_init_ah_attr_from_wc(agent->device, agent->port_num, 262 mad_recv_wc->wc, 263 mad_recv_wc->recv_buf.grh, 264 &ah_attr); 265 if (ret) 266 goto err2; 267 268 grh = rdma_ah_read_grh(&ah_attr); 269 packet->mad.hdr.gid_index = grh->sgid_index; 270 packet->mad.hdr.hop_limit = grh->hop_limit; 271 packet->mad.hdr.traffic_class = grh->traffic_class; 272 memcpy(packet->mad.hdr.gid, &grh->dgid, 16); 273 packet->mad.hdr.flow_label = cpu_to_be32(grh->flow_label); 274 rdma_destroy_ah_attr(&ah_attr); 275 } 276 277 if (queue_packet(file, agent, packet)) 278 goto err2; 279 return; 280 281 err2: 282 kfree(packet); 283 err1: 284 ib_free_recv_mad(mad_recv_wc); 285 } 286 287 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf, 288 struct ib_umad_packet *packet, size_t count) 289 { 290 struct ib_mad_recv_buf *recv_buf; 291 int left, seg_payload, offset, max_seg_payload; 292 size_t seg_size; 293 294 recv_buf = &packet->recv_wc->recv_buf; 295 seg_size = packet->recv_wc->mad_seg_size; 296 297 /* We need enough room to copy the first (or only) MAD segment. */ 298 if ((packet->length <= seg_size && 299 count < hdr_size(file) + packet->length) || 300 (packet->length > seg_size && 301 count < hdr_size(file) + seg_size)) 302 return -EINVAL; 303 304 if (copy_to_user(buf, &packet->mad, hdr_size(file))) 305 return -EFAULT; 306 307 buf += hdr_size(file); 308 seg_payload = min_t(int, packet->length, seg_size); 309 if (copy_to_user(buf, recv_buf->mad, seg_payload)) 310 return -EFAULT; 311 312 if (seg_payload < packet->length) { 313 /* 314 * Multipacket RMPP MAD message. Copy remainder of message. 315 * Note that last segment may have a shorter payload. 316 */ 317 if (count < hdr_size(file) + packet->length) { 318 /* 319 * The buffer is too small, return the first RMPP segment, 320 * which includes the RMPP message length. 321 */ 322 return -ENOSPC; 323 } 324 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class); 325 max_seg_payload = seg_size - offset; 326 327 for (left = packet->length - seg_payload, buf += seg_payload; 328 left; left -= seg_payload, buf += seg_payload) { 329 recv_buf = container_of(recv_buf->list.next, 330 struct ib_mad_recv_buf, list); 331 seg_payload = min(left, max_seg_payload); 332 if (copy_to_user(buf, ((void *) recv_buf->mad) + offset, 333 seg_payload)) 334 return -EFAULT; 335 } 336 } 337 return hdr_size(file) + packet->length; 338 } 339 340 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf, 341 struct ib_umad_packet *packet, size_t count) 342 { 343 ssize_t size = hdr_size(file) + packet->length; 344 345 if (count < size) 346 return -EINVAL; 347 348 if (copy_to_user(buf, &packet->mad, hdr_size(file))) 349 return -EFAULT; 350 351 buf += hdr_size(file); 352 353 if (copy_to_user(buf, packet->mad.data, packet->length)) 354 return -EFAULT; 355 356 return size; 357 } 358 359 static ssize_t ib_umad_read(struct file *filp, char __user *buf, 360 size_t count, loff_t *pos) 361 { 362 struct ib_umad_file *file = filp->private_data; 363 struct ib_umad_packet *packet; 364 ssize_t ret; 365 366 if (count < hdr_size(file)) 367 return -EINVAL; 368 369 mutex_lock(&file->mutex); 370 371 while (list_empty(&file->recv_list)) { 372 mutex_unlock(&file->mutex); 373 374 if (filp->f_flags & O_NONBLOCK) 375 return -EAGAIN; 376 377 if (wait_event_interruptible(file->recv_wait, 378 !list_empty(&file->recv_list))) 379 return -ERESTARTSYS; 380 381 mutex_lock(&file->mutex); 382 } 383 384 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list); 385 list_del(&packet->list); 386 387 mutex_unlock(&file->mutex); 388 389 if (packet->recv_wc) 390 ret = copy_recv_mad(file, buf, packet, count); 391 else 392 ret = copy_send_mad(file, buf, packet, count); 393 394 if (ret < 0) { 395 /* Requeue packet */ 396 mutex_lock(&file->mutex); 397 list_add(&packet->list, &file->recv_list); 398 mutex_unlock(&file->mutex); 399 } else { 400 if (packet->recv_wc) 401 ib_free_recv_mad(packet->recv_wc); 402 kfree(packet); 403 } 404 return ret; 405 } 406 407 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf) 408 { 409 int left, seg; 410 411 /* Copy class specific header */ 412 if ((msg->hdr_len > IB_MGMT_RMPP_HDR) && 413 copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR, 414 msg->hdr_len - IB_MGMT_RMPP_HDR)) 415 return -EFAULT; 416 417 /* All headers are in place. Copy data segments. */ 418 for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0; 419 seg++, left -= msg->seg_size, buf += msg->seg_size) { 420 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf, 421 min(left, msg->seg_size))) 422 return -EFAULT; 423 } 424 return 0; 425 } 426 427 static int same_destination(struct ib_user_mad_hdr *hdr1, 428 struct ib_user_mad_hdr *hdr2) 429 { 430 if (!hdr1->grh_present && !hdr2->grh_present) 431 return (hdr1->lid == hdr2->lid); 432 433 if (hdr1->grh_present && hdr2->grh_present) 434 return !memcmp(hdr1->gid, hdr2->gid, 16); 435 436 return 0; 437 } 438 439 static int is_duplicate(struct ib_umad_file *file, 440 struct ib_umad_packet *packet) 441 { 442 struct ib_umad_packet *sent_packet; 443 struct ib_mad_hdr *sent_hdr, *hdr; 444 445 hdr = (struct ib_mad_hdr *) packet->mad.data; 446 list_for_each_entry(sent_packet, &file->send_list, list) { 447 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data; 448 449 if ((hdr->tid != sent_hdr->tid) || 450 (hdr->mgmt_class != sent_hdr->mgmt_class)) 451 continue; 452 453 /* 454 * No need to be overly clever here. If two new operations have 455 * the same TID, reject the second as a duplicate. This is more 456 * restrictive than required by the spec. 457 */ 458 if (!ib_response_mad(hdr)) { 459 if (!ib_response_mad(sent_hdr)) 460 return 1; 461 continue; 462 } else if (!ib_response_mad(sent_hdr)) 463 continue; 464 465 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr)) 466 return 1; 467 } 468 469 return 0; 470 } 471 472 static ssize_t ib_umad_write(struct file *filp, const char __user *buf, 473 size_t count, loff_t *pos) 474 { 475 struct ib_umad_file *file = filp->private_data; 476 struct ib_umad_packet *packet; 477 struct ib_mad_agent *agent; 478 struct rdma_ah_attr ah_attr; 479 struct ib_ah *ah; 480 struct ib_rmpp_mad *rmpp_mad; 481 __be64 *tid; 482 int ret, data_len, hdr_len, copy_offset, rmpp_active; 483 u8 base_version; 484 485 if (count < hdr_size(file) + IB_MGMT_RMPP_HDR) 486 return -EINVAL; 487 488 packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL); 489 if (!packet) 490 return -ENOMEM; 491 492 if (copy_from_user(&packet->mad, buf, hdr_size(file))) { 493 ret = -EFAULT; 494 goto err; 495 } 496 497 if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) { 498 ret = -EINVAL; 499 goto err; 500 } 501 502 buf += hdr_size(file); 503 504 if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) { 505 ret = -EFAULT; 506 goto err; 507 } 508 509 mutex_lock(&file->mutex); 510 511 agent = __get_agent(file, packet->mad.hdr.id); 512 if (!agent) { 513 ret = -EINVAL; 514 goto err_up; 515 } 516 517 memset(&ah_attr, 0, sizeof ah_attr); 518 ah_attr.type = rdma_ah_find_type(agent->device, 519 file->port->port_num); 520 rdma_ah_set_dlid(&ah_attr, be16_to_cpu(packet->mad.hdr.lid)); 521 rdma_ah_set_sl(&ah_attr, packet->mad.hdr.sl); 522 rdma_ah_set_path_bits(&ah_attr, packet->mad.hdr.path_bits); 523 rdma_ah_set_port_num(&ah_attr, file->port->port_num); 524 if (packet->mad.hdr.grh_present) { 525 rdma_ah_set_grh(&ah_attr, NULL, 526 be32_to_cpu(packet->mad.hdr.flow_label), 527 packet->mad.hdr.gid_index, 528 packet->mad.hdr.hop_limit, 529 packet->mad.hdr.traffic_class); 530 rdma_ah_set_dgid_raw(&ah_attr, packet->mad.hdr.gid); 531 } 532 533 ah = rdma_create_user_ah(agent->qp->pd, &ah_attr, NULL); 534 if (IS_ERR(ah)) { 535 ret = PTR_ERR(ah); 536 goto err_up; 537 } 538 539 rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data; 540 hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class); 541 542 if (ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class) 543 && ib_mad_kernel_rmpp_agent(agent)) { 544 copy_offset = IB_MGMT_RMPP_HDR; 545 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 546 IB_MGMT_RMPP_FLAG_ACTIVE; 547 } else { 548 copy_offset = IB_MGMT_MAD_HDR; 549 rmpp_active = 0; 550 } 551 552 base_version = ((struct ib_mad_hdr *)&packet->mad.data)->base_version; 553 data_len = count - hdr_size(file) - hdr_len; 554 packet->msg = ib_create_send_mad(agent, 555 be32_to_cpu(packet->mad.hdr.qpn), 556 packet->mad.hdr.pkey_index, rmpp_active, 557 hdr_len, data_len, GFP_KERNEL, 558 base_version); 559 if (IS_ERR(packet->msg)) { 560 ret = PTR_ERR(packet->msg); 561 goto err_ah; 562 } 563 564 packet->msg->ah = ah; 565 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms; 566 packet->msg->retries = packet->mad.hdr.retries; 567 packet->msg->context[0] = packet; 568 569 /* Copy MAD header. Any RMPP header is already in place. */ 570 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR); 571 572 if (!rmpp_active) { 573 if (copy_from_user(packet->msg->mad + copy_offset, 574 buf + copy_offset, 575 hdr_len + data_len - copy_offset)) { 576 ret = -EFAULT; 577 goto err_msg; 578 } 579 } else { 580 ret = copy_rmpp_mad(packet->msg, buf); 581 if (ret) 582 goto err_msg; 583 } 584 585 /* 586 * Set the high-order part of the transaction ID to make MADs from 587 * different agents unique, and allow routing responses back to the 588 * original requestor. 589 */ 590 if (!ib_response_mad(packet->msg->mad)) { 591 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid; 592 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 | 593 (be64_to_cpup(tid) & 0xffffffff)); 594 rmpp_mad->mad_hdr.tid = *tid; 595 } 596 597 if (!ib_mad_kernel_rmpp_agent(agent) 598 && ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class) 599 && (ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE)) { 600 spin_lock_irq(&file->send_lock); 601 list_add_tail(&packet->list, &file->send_list); 602 spin_unlock_irq(&file->send_lock); 603 } else { 604 spin_lock_irq(&file->send_lock); 605 ret = is_duplicate(file, packet); 606 if (!ret) 607 list_add_tail(&packet->list, &file->send_list); 608 spin_unlock_irq(&file->send_lock); 609 if (ret) { 610 ret = -EINVAL; 611 goto err_msg; 612 } 613 } 614 615 ret = ib_post_send_mad(packet->msg, NULL); 616 if (ret) 617 goto err_send; 618 619 mutex_unlock(&file->mutex); 620 return count; 621 622 err_send: 623 dequeue_send(file, packet); 624 err_msg: 625 ib_free_send_mad(packet->msg); 626 err_ah: 627 rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE); 628 err_up: 629 mutex_unlock(&file->mutex); 630 err: 631 kfree(packet); 632 return ret; 633 } 634 635 static __poll_t ib_umad_poll(struct file *filp, struct poll_table_struct *wait) 636 { 637 struct ib_umad_file *file = filp->private_data; 638 639 /* we will always be able to post a MAD send */ 640 __poll_t mask = EPOLLOUT | EPOLLWRNORM; 641 642 poll_wait(filp, &file->recv_wait, wait); 643 644 if (!list_empty(&file->recv_list)) 645 mask |= EPOLLIN | EPOLLRDNORM; 646 647 return mask; 648 } 649 650 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg, 651 int compat_method_mask) 652 { 653 struct ib_user_mad_reg_req ureq; 654 struct ib_mad_reg_req req; 655 struct ib_mad_agent *agent = NULL; 656 int agent_id; 657 int ret; 658 659 mutex_lock(&file->port->file_mutex); 660 mutex_lock(&file->mutex); 661 662 if (!file->port->ib_dev) { 663 dev_notice(&file->port->dev, 664 "ib_umad_reg_agent: invalid device\n"); 665 ret = -EPIPE; 666 goto out; 667 } 668 669 if (copy_from_user(&ureq, arg, sizeof ureq)) { 670 ret = -EFAULT; 671 goto out; 672 } 673 674 if (ureq.qpn != 0 && ureq.qpn != 1) { 675 dev_notice(&file->port->dev, 676 "ib_umad_reg_agent: invalid QPN %d specified\n", 677 ureq.qpn); 678 ret = -EINVAL; 679 goto out; 680 } 681 682 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id) 683 if (!__get_agent(file, agent_id)) 684 goto found; 685 686 dev_notice(&file->port->dev, 687 "ib_umad_reg_agent: Max Agents (%u) reached\n", 688 IB_UMAD_MAX_AGENTS); 689 ret = -ENOMEM; 690 goto out; 691 692 found: 693 if (ureq.mgmt_class) { 694 memset(&req, 0, sizeof(req)); 695 req.mgmt_class = ureq.mgmt_class; 696 req.mgmt_class_version = ureq.mgmt_class_version; 697 memcpy(req.oui, ureq.oui, sizeof req.oui); 698 699 if (compat_method_mask) { 700 u32 *umm = (u32 *) ureq.method_mask; 701 int i; 702 703 for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i) 704 req.method_mask[i] = 705 umm[i * 2] | ((u64) umm[i * 2 + 1] << 32); 706 } else 707 memcpy(req.method_mask, ureq.method_mask, 708 sizeof req.method_mask); 709 } 710 711 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num, 712 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI, 713 ureq.mgmt_class ? &req : NULL, 714 ureq.rmpp_version, 715 send_handler, recv_handler, file, 0); 716 if (IS_ERR(agent)) { 717 ret = PTR_ERR(agent); 718 agent = NULL; 719 goto out; 720 } 721 722 if (put_user(agent_id, 723 (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) { 724 ret = -EFAULT; 725 goto out; 726 } 727 728 if (!file->already_used) { 729 file->already_used = 1; 730 if (!file->use_pkey_index) { 731 dev_warn(&file->port->dev, 732 "process %s did not enable P_Key index support.\n", 733 current->comm); 734 dev_warn(&file->port->dev, 735 " Documentation/infiniband/user_mad.txt has info on the new ABI.\n"); 736 } 737 } 738 739 file->agent[agent_id] = agent; 740 ret = 0; 741 742 out: 743 mutex_unlock(&file->mutex); 744 745 if (ret && agent) 746 ib_unregister_mad_agent(agent); 747 748 mutex_unlock(&file->port->file_mutex); 749 750 return ret; 751 } 752 753 static int ib_umad_reg_agent2(struct ib_umad_file *file, void __user *arg) 754 { 755 struct ib_user_mad_reg_req2 ureq; 756 struct ib_mad_reg_req req; 757 struct ib_mad_agent *agent = NULL; 758 int agent_id; 759 int ret; 760 761 mutex_lock(&file->port->file_mutex); 762 mutex_lock(&file->mutex); 763 764 if (!file->port->ib_dev) { 765 dev_notice(&file->port->dev, 766 "ib_umad_reg_agent2: invalid device\n"); 767 ret = -EPIPE; 768 goto out; 769 } 770 771 if (copy_from_user(&ureq, arg, sizeof(ureq))) { 772 ret = -EFAULT; 773 goto out; 774 } 775 776 if (ureq.qpn != 0 && ureq.qpn != 1) { 777 dev_notice(&file->port->dev, 778 "ib_umad_reg_agent2: invalid QPN %d specified\n", 779 ureq.qpn); 780 ret = -EINVAL; 781 goto out; 782 } 783 784 if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) { 785 dev_notice(&file->port->dev, 786 "ib_umad_reg_agent2 failed: invalid registration flags specified 0x%x; supported 0x%x\n", 787 ureq.flags, IB_USER_MAD_REG_FLAGS_CAP); 788 ret = -EINVAL; 789 790 if (put_user((u32)IB_USER_MAD_REG_FLAGS_CAP, 791 (u32 __user *) (arg + offsetof(struct 792 ib_user_mad_reg_req2, flags)))) 793 ret = -EFAULT; 794 795 goto out; 796 } 797 798 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id) 799 if (!__get_agent(file, agent_id)) 800 goto found; 801 802 dev_notice(&file->port->dev, 803 "ib_umad_reg_agent2: Max Agents (%u) reached\n", 804 IB_UMAD_MAX_AGENTS); 805 ret = -ENOMEM; 806 goto out; 807 808 found: 809 if (ureq.mgmt_class) { 810 memset(&req, 0, sizeof(req)); 811 req.mgmt_class = ureq.mgmt_class; 812 req.mgmt_class_version = ureq.mgmt_class_version; 813 if (ureq.oui & 0xff000000) { 814 dev_notice(&file->port->dev, 815 "ib_umad_reg_agent2 failed: oui invalid 0x%08x\n", 816 ureq.oui); 817 ret = -EINVAL; 818 goto out; 819 } 820 req.oui[2] = ureq.oui & 0x0000ff; 821 req.oui[1] = (ureq.oui & 0x00ff00) >> 8; 822 req.oui[0] = (ureq.oui & 0xff0000) >> 16; 823 memcpy(req.method_mask, ureq.method_mask, 824 sizeof(req.method_mask)); 825 } 826 827 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num, 828 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI, 829 ureq.mgmt_class ? &req : NULL, 830 ureq.rmpp_version, 831 send_handler, recv_handler, file, 832 ureq.flags); 833 if (IS_ERR(agent)) { 834 ret = PTR_ERR(agent); 835 agent = NULL; 836 goto out; 837 } 838 839 if (put_user(agent_id, 840 (u32 __user *)(arg + 841 offsetof(struct ib_user_mad_reg_req2, id)))) { 842 ret = -EFAULT; 843 goto out; 844 } 845 846 if (!file->already_used) { 847 file->already_used = 1; 848 file->use_pkey_index = 1; 849 } 850 851 file->agent[agent_id] = agent; 852 ret = 0; 853 854 out: 855 mutex_unlock(&file->mutex); 856 857 if (ret && agent) 858 ib_unregister_mad_agent(agent); 859 860 mutex_unlock(&file->port->file_mutex); 861 862 return ret; 863 } 864 865 866 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg) 867 { 868 struct ib_mad_agent *agent = NULL; 869 u32 id; 870 int ret = 0; 871 872 if (get_user(id, arg)) 873 return -EFAULT; 874 875 mutex_lock(&file->port->file_mutex); 876 mutex_lock(&file->mutex); 877 878 if (id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) { 879 ret = -EINVAL; 880 goto out; 881 } 882 883 agent = file->agent[id]; 884 file->agent[id] = NULL; 885 886 out: 887 mutex_unlock(&file->mutex); 888 889 if (agent) 890 ib_unregister_mad_agent(agent); 891 892 mutex_unlock(&file->port->file_mutex); 893 894 return ret; 895 } 896 897 static long ib_umad_enable_pkey(struct ib_umad_file *file) 898 { 899 int ret = 0; 900 901 mutex_lock(&file->mutex); 902 if (file->already_used) 903 ret = -EINVAL; 904 else 905 file->use_pkey_index = 1; 906 mutex_unlock(&file->mutex); 907 908 return ret; 909 } 910 911 static long ib_umad_ioctl(struct file *filp, unsigned int cmd, 912 unsigned long arg) 913 { 914 switch (cmd) { 915 case IB_USER_MAD_REGISTER_AGENT: 916 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0); 917 case IB_USER_MAD_UNREGISTER_AGENT: 918 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg); 919 case IB_USER_MAD_ENABLE_PKEY: 920 return ib_umad_enable_pkey(filp->private_data); 921 case IB_USER_MAD_REGISTER_AGENT2: 922 return ib_umad_reg_agent2(filp->private_data, (void __user *) arg); 923 default: 924 return -ENOIOCTLCMD; 925 } 926 } 927 928 #ifdef CONFIG_COMPAT 929 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd, 930 unsigned long arg) 931 { 932 switch (cmd) { 933 case IB_USER_MAD_REGISTER_AGENT: 934 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1); 935 case IB_USER_MAD_UNREGISTER_AGENT: 936 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg)); 937 case IB_USER_MAD_ENABLE_PKEY: 938 return ib_umad_enable_pkey(filp->private_data); 939 case IB_USER_MAD_REGISTER_AGENT2: 940 return ib_umad_reg_agent2(filp->private_data, compat_ptr(arg)); 941 default: 942 return -ENOIOCTLCMD; 943 } 944 } 945 #endif 946 947 /* 948 * ib_umad_open() does not need the BKL: 949 * 950 * - the ib_umad_port structures are properly reference counted, and 951 * everything else is purely local to the file being created, so 952 * races against other open calls are not a problem; 953 * - the ioctl method does not affect any global state outside of the 954 * file structure being operated on; 955 */ 956 static int ib_umad_open(struct inode *inode, struct file *filp) 957 { 958 struct ib_umad_port *port; 959 struct ib_umad_file *file; 960 int ret = -ENXIO; 961 962 port = container_of(inode->i_cdev, struct ib_umad_port, cdev); 963 964 mutex_lock(&port->file_mutex); 965 966 if (!port->ib_dev) 967 goto out; 968 969 ret = -ENOMEM; 970 file = kzalloc(sizeof *file, GFP_KERNEL); 971 if (!file) 972 goto out; 973 974 mutex_init(&file->mutex); 975 spin_lock_init(&file->send_lock); 976 INIT_LIST_HEAD(&file->recv_list); 977 INIT_LIST_HEAD(&file->send_list); 978 init_waitqueue_head(&file->recv_wait); 979 980 file->port = port; 981 filp->private_data = file; 982 983 list_add_tail(&file->port_list, &port->file_list); 984 985 ret = nonseekable_open(inode, filp); 986 if (ret) { 987 list_del(&file->port_list); 988 kfree(file); 989 goto out; 990 } 991 992 ib_umad_dev_get(port->umad_dev); 993 out: 994 mutex_unlock(&port->file_mutex); 995 return ret; 996 } 997 998 static int ib_umad_close(struct inode *inode, struct file *filp) 999 { 1000 struct ib_umad_file *file = filp->private_data; 1001 struct ib_umad_device *dev = file->port->umad_dev; 1002 struct ib_umad_packet *packet, *tmp; 1003 int already_dead; 1004 int i; 1005 1006 mutex_lock(&file->port->file_mutex); 1007 mutex_lock(&file->mutex); 1008 1009 already_dead = file->agents_dead; 1010 file->agents_dead = 1; 1011 1012 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) { 1013 if (packet->recv_wc) 1014 ib_free_recv_mad(packet->recv_wc); 1015 kfree(packet); 1016 } 1017 1018 list_del(&file->port_list); 1019 1020 mutex_unlock(&file->mutex); 1021 1022 if (!already_dead) 1023 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i) 1024 if (file->agent[i]) 1025 ib_unregister_mad_agent(file->agent[i]); 1026 1027 mutex_unlock(&file->port->file_mutex); 1028 1029 kfree(file); 1030 ib_umad_dev_put(dev); 1031 return 0; 1032 } 1033 1034 static const struct file_operations umad_fops = { 1035 .owner = THIS_MODULE, 1036 .read = ib_umad_read, 1037 .write = ib_umad_write, 1038 .poll = ib_umad_poll, 1039 .unlocked_ioctl = ib_umad_ioctl, 1040 #ifdef CONFIG_COMPAT 1041 .compat_ioctl = ib_umad_compat_ioctl, 1042 #endif 1043 .open = ib_umad_open, 1044 .release = ib_umad_close, 1045 .llseek = no_llseek, 1046 }; 1047 1048 static int ib_umad_sm_open(struct inode *inode, struct file *filp) 1049 { 1050 struct ib_umad_port *port; 1051 struct ib_port_modify props = { 1052 .set_port_cap_mask = IB_PORT_SM 1053 }; 1054 int ret; 1055 1056 port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev); 1057 1058 if (filp->f_flags & O_NONBLOCK) { 1059 if (down_trylock(&port->sm_sem)) { 1060 ret = -EAGAIN; 1061 goto fail; 1062 } 1063 } else { 1064 if (down_interruptible(&port->sm_sem)) { 1065 ret = -ERESTARTSYS; 1066 goto fail; 1067 } 1068 } 1069 1070 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props); 1071 if (ret) 1072 goto err_up_sem; 1073 1074 filp->private_data = port; 1075 1076 ret = nonseekable_open(inode, filp); 1077 if (ret) 1078 goto err_clr_sm_cap; 1079 1080 ib_umad_dev_get(port->umad_dev); 1081 return 0; 1082 1083 err_clr_sm_cap: 1084 swap(props.set_port_cap_mask, props.clr_port_cap_mask); 1085 ib_modify_port(port->ib_dev, port->port_num, 0, &props); 1086 1087 err_up_sem: 1088 up(&port->sm_sem); 1089 1090 fail: 1091 return ret; 1092 } 1093 1094 static int ib_umad_sm_close(struct inode *inode, struct file *filp) 1095 { 1096 struct ib_umad_port *port = filp->private_data; 1097 struct ib_port_modify props = { 1098 .clr_port_cap_mask = IB_PORT_SM 1099 }; 1100 int ret = 0; 1101 1102 mutex_lock(&port->file_mutex); 1103 if (port->ib_dev) 1104 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props); 1105 mutex_unlock(&port->file_mutex); 1106 1107 up(&port->sm_sem); 1108 1109 ib_umad_dev_put(port->umad_dev); 1110 return ret; 1111 } 1112 1113 static const struct file_operations umad_sm_fops = { 1114 .owner = THIS_MODULE, 1115 .open = ib_umad_sm_open, 1116 .release = ib_umad_sm_close, 1117 .llseek = no_llseek, 1118 }; 1119 1120 static struct ib_client umad_client = { 1121 .name = "umad", 1122 .add = ib_umad_add_one, 1123 .remove = ib_umad_remove_one 1124 }; 1125 1126 static ssize_t ibdev_show(struct device *dev, struct device_attribute *attr, 1127 char *buf) 1128 { 1129 struct ib_umad_port *port = dev_get_drvdata(dev); 1130 1131 if (!port) 1132 return -ENODEV; 1133 1134 return sprintf(buf, "%s\n", dev_name(&port->ib_dev->dev)); 1135 } 1136 static DEVICE_ATTR_RO(ibdev); 1137 1138 static ssize_t port_show(struct device *dev, struct device_attribute *attr, 1139 char *buf) 1140 { 1141 struct ib_umad_port *port = dev_get_drvdata(dev); 1142 1143 if (!port) 1144 return -ENODEV; 1145 1146 return sprintf(buf, "%d\n", port->port_num); 1147 } 1148 static DEVICE_ATTR_RO(port); 1149 1150 static struct attribute *umad_class_dev_attrs[] = { 1151 &dev_attr_ibdev.attr, 1152 &dev_attr_port.attr, 1153 NULL, 1154 }; 1155 ATTRIBUTE_GROUPS(umad_class_dev); 1156 1157 static char *umad_devnode(struct device *dev, umode_t *mode) 1158 { 1159 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 1160 } 1161 1162 static ssize_t abi_version_show(struct class *class, 1163 struct class_attribute *attr, char *buf) 1164 { 1165 return sprintf(buf, "%d\n", IB_USER_MAD_ABI_VERSION); 1166 } 1167 static CLASS_ATTR_RO(abi_version); 1168 1169 static struct attribute *umad_class_attrs[] = { 1170 &class_attr_abi_version.attr, 1171 NULL, 1172 }; 1173 ATTRIBUTE_GROUPS(umad_class); 1174 1175 static struct class umad_class = { 1176 .name = "infiniband_mad", 1177 .devnode = umad_devnode, 1178 .class_groups = umad_class_groups, 1179 .dev_groups = umad_class_dev_groups, 1180 }; 1181 1182 static void ib_umad_release_port(struct device *device) 1183 { 1184 struct ib_umad_port *port = dev_get_drvdata(device); 1185 struct ib_umad_device *umad_dev = port->umad_dev; 1186 1187 ib_umad_dev_put(umad_dev); 1188 } 1189 1190 static void ib_umad_init_port_dev(struct device *dev, 1191 struct ib_umad_port *port, 1192 const struct ib_device *device) 1193 { 1194 device_initialize(dev); 1195 ib_umad_dev_get(port->umad_dev); 1196 dev->class = &umad_class; 1197 dev->parent = device->dev.parent; 1198 dev_set_drvdata(dev, port); 1199 dev->release = ib_umad_release_port; 1200 } 1201 1202 static int ib_umad_init_port(struct ib_device *device, int port_num, 1203 struct ib_umad_device *umad_dev, 1204 struct ib_umad_port *port) 1205 { 1206 int devnum; 1207 dev_t base_umad; 1208 dev_t base_issm; 1209 int ret; 1210 1211 devnum = ida_alloc_max(&umad_ida, IB_UMAD_MAX_PORTS - 1, GFP_KERNEL); 1212 if (devnum < 0) 1213 return -1; 1214 port->dev_num = devnum; 1215 if (devnum >= IB_UMAD_NUM_FIXED_MINOR) { 1216 base_umad = dynamic_umad_dev + devnum - IB_UMAD_NUM_FIXED_MINOR; 1217 base_issm = dynamic_issm_dev + devnum - IB_UMAD_NUM_FIXED_MINOR; 1218 } else { 1219 base_umad = devnum + base_umad_dev; 1220 base_issm = devnum + base_issm_dev; 1221 } 1222 1223 port->ib_dev = device; 1224 port->umad_dev = umad_dev; 1225 port->port_num = port_num; 1226 sema_init(&port->sm_sem, 1); 1227 mutex_init(&port->file_mutex); 1228 INIT_LIST_HEAD(&port->file_list); 1229 1230 ib_umad_init_port_dev(&port->dev, port, device); 1231 port->dev.devt = base_umad; 1232 dev_set_name(&port->dev, "umad%d", port->dev_num); 1233 cdev_init(&port->cdev, &umad_fops); 1234 port->cdev.owner = THIS_MODULE; 1235 1236 ret = cdev_device_add(&port->cdev, &port->dev); 1237 if (ret) 1238 goto err_cdev; 1239 1240 ib_umad_init_port_dev(&port->sm_dev, port, device); 1241 port->sm_dev.devt = base_issm; 1242 dev_set_name(&port->sm_dev, "issm%d", port->dev_num); 1243 cdev_init(&port->sm_cdev, &umad_sm_fops); 1244 port->sm_cdev.owner = THIS_MODULE; 1245 1246 ret = cdev_device_add(&port->sm_cdev, &port->sm_dev); 1247 if (ret) 1248 goto err_dev; 1249 1250 return 0; 1251 1252 err_dev: 1253 put_device(&port->sm_dev); 1254 cdev_device_del(&port->cdev, &port->dev); 1255 err_cdev: 1256 put_device(&port->dev); 1257 ida_free(&umad_ida, devnum); 1258 return ret; 1259 } 1260 1261 static void ib_umad_kill_port(struct ib_umad_port *port) 1262 { 1263 struct ib_umad_file *file; 1264 int id; 1265 1266 mutex_lock(&port->file_mutex); 1267 1268 /* Mark ib_dev NULL and block ioctl or other file ops to progress 1269 * further. 1270 */ 1271 port->ib_dev = NULL; 1272 1273 list_for_each_entry(file, &port->file_list, port_list) { 1274 mutex_lock(&file->mutex); 1275 file->agents_dead = 1; 1276 mutex_unlock(&file->mutex); 1277 1278 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id) 1279 if (file->agent[id]) 1280 ib_unregister_mad_agent(file->agent[id]); 1281 } 1282 1283 mutex_unlock(&port->file_mutex); 1284 1285 cdev_device_del(&port->sm_cdev, &port->sm_dev); 1286 put_device(&port->sm_dev); 1287 cdev_device_del(&port->cdev, &port->dev); 1288 put_device(&port->dev); 1289 ida_free(&umad_ida, port->dev_num); 1290 } 1291 1292 static void ib_umad_add_one(struct ib_device *device) 1293 { 1294 struct ib_umad_device *umad_dev; 1295 int s, e, i; 1296 int count = 0; 1297 1298 s = rdma_start_port(device); 1299 e = rdma_end_port(device); 1300 1301 umad_dev = kzalloc(struct_size(umad_dev, ports, e - s + 1), GFP_KERNEL); 1302 if (!umad_dev) 1303 return; 1304 1305 kref_init(&umad_dev->kref); 1306 for (i = s; i <= e; ++i) { 1307 if (!rdma_cap_ib_mad(device, i)) 1308 continue; 1309 1310 if (ib_umad_init_port(device, i, umad_dev, 1311 &umad_dev->ports[i - s])) 1312 goto err; 1313 1314 count++; 1315 } 1316 1317 if (!count) 1318 goto free; 1319 1320 ib_set_client_data(device, &umad_client, umad_dev); 1321 1322 return; 1323 1324 err: 1325 while (--i >= s) { 1326 if (!rdma_cap_ib_mad(device, i)) 1327 continue; 1328 1329 ib_umad_kill_port(&umad_dev->ports[i - s]); 1330 } 1331 free: 1332 ib_umad_dev_put(umad_dev); 1333 } 1334 1335 static void ib_umad_remove_one(struct ib_device *device, void *client_data) 1336 { 1337 struct ib_umad_device *umad_dev = client_data; 1338 int i; 1339 1340 if (!umad_dev) 1341 return; 1342 1343 for (i = 0; i <= rdma_end_port(device) - rdma_start_port(device); ++i) { 1344 if (rdma_cap_ib_mad(device, i + rdma_start_port(device))) 1345 ib_umad_kill_port(&umad_dev->ports[i]); 1346 } 1347 ib_umad_dev_put(umad_dev); 1348 } 1349 1350 static int __init ib_umad_init(void) 1351 { 1352 int ret; 1353 1354 ret = register_chrdev_region(base_umad_dev, 1355 IB_UMAD_NUM_FIXED_MINOR * 2, 1356 umad_class.name); 1357 if (ret) { 1358 pr_err("couldn't register device number\n"); 1359 goto out; 1360 } 1361 1362 ret = alloc_chrdev_region(&dynamic_umad_dev, 0, 1363 IB_UMAD_NUM_DYNAMIC_MINOR * 2, 1364 umad_class.name); 1365 if (ret) { 1366 pr_err("couldn't register dynamic device number\n"); 1367 goto out_alloc; 1368 } 1369 dynamic_issm_dev = dynamic_umad_dev + IB_UMAD_NUM_DYNAMIC_MINOR; 1370 1371 ret = class_register(&umad_class); 1372 if (ret) { 1373 pr_err("couldn't create class infiniband_mad\n"); 1374 goto out_chrdev; 1375 } 1376 1377 ret = ib_register_client(&umad_client); 1378 if (ret) { 1379 pr_err("couldn't register ib_umad client\n"); 1380 goto out_class; 1381 } 1382 1383 return 0; 1384 1385 out_class: 1386 class_unregister(&umad_class); 1387 1388 out_chrdev: 1389 unregister_chrdev_region(dynamic_umad_dev, 1390 IB_UMAD_NUM_DYNAMIC_MINOR * 2); 1391 1392 out_alloc: 1393 unregister_chrdev_region(base_umad_dev, 1394 IB_UMAD_NUM_FIXED_MINOR * 2); 1395 1396 out: 1397 return ret; 1398 } 1399 1400 static void __exit ib_umad_cleanup(void) 1401 { 1402 ib_unregister_client(&umad_client); 1403 class_unregister(&umad_class); 1404 unregister_chrdev_region(base_umad_dev, 1405 IB_UMAD_NUM_FIXED_MINOR * 2); 1406 unregister_chrdev_region(dynamic_umad_dev, 1407 IB_UMAD_NUM_DYNAMIC_MINOR * 2); 1408 } 1409 1410 module_init(ib_umad_init); 1411 module_exit(ib_umad_cleanup); 1412