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