1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0 3 * 4 * Copyright (c) 2004 Topspin Communications. All rights reserved. 5 * Copyright (c) 2005 Voltaire, Inc. All rights reserved. 6 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. 7 * Copyright (c) 2008 Cisco. All rights reserved. 8 * 9 * This software is available to you under a choice of one of two 10 * licenses. You may choose to be licensed under the terms of the GNU 11 * General Public License (GPL) Version 2, available from the file 12 * COPYING in the main directory of this source tree, or the 13 * OpenIB.org BSD license below: 14 * 15 * Redistribution and use in source and binary forms, with or 16 * without modification, are permitted provided that the following 17 * conditions are met: 18 * 19 * - Redistributions of source code must retain the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer. 22 * 23 * - Redistributions in binary form must reproduce the above 24 * copyright notice, this list of conditions and the following 25 * disclaimer in the documentation and/or other materials 26 * provided with the distribution. 27 * 28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 29 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 30 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 31 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 32 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 33 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 34 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 35 * SOFTWARE. 36 */ 37 38 #include <sys/cdefs.h> 39 #define pr_fmt(fmt) "user_mad: " fmt 40 41 #include <linux/module.h> 42 #include <linux/device.h> 43 #include <linux/err.h> 44 #include <linux/fs.h> 45 #include <linux/cdev.h> 46 #include <linux/dma-mapping.h> 47 #include <linux/poll.h> 48 #include <linux/mutex.h> 49 #include <linux/kref.h> 50 #include <linux/compat.h> 51 #include <linux/sched.h> 52 #include <linux/semaphore.h> 53 #include <linux/slab.h> 54 55 #include <asm/uaccess.h> 56 57 #include <rdma/ib_mad.h> 58 #include <rdma/ib_user_mad.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 = 64, 66 IB_UMAD_MAX_AGENTS = 32, 67 68 IB_UMAD_MAJOR = 231, 69 IB_UMAD_MINOR_BASE = 0 70 }; 71 72 /* 73 * Our lifetime rules for these structs are the following: 74 * device special file is opened, we take a reference on the 75 * ib_umad_port's struct ib_umad_device. We drop these 76 * references in the corresponding close(). 77 * 78 * In addition to references coming from open character devices, there 79 * is one more reference to each ib_umad_device representing the 80 * module's reference taken when allocating the ib_umad_device in 81 * ib_umad_add_one(). 82 * 83 * When destroying an ib_umad_device, we drop the module's reference. 84 */ 85 86 struct ib_umad_port { 87 struct cdev cdev; 88 struct device *dev; 89 90 struct cdev sm_cdev; 91 struct device *sm_dev; 92 struct semaphore sm_sem; 93 94 struct mutex file_mutex; 95 struct list_head file_list; 96 97 struct ib_device *ib_dev; 98 struct ib_umad_device *umad_dev; 99 int dev_num; 100 u8 port_num; 101 }; 102 103 struct ib_umad_device { 104 struct kobject kobj; 105 struct ib_umad_port port[0]; 106 }; 107 108 struct ib_umad_file { 109 struct mutex mutex; 110 struct ib_umad_port *port; 111 struct list_head recv_list; 112 struct list_head send_list; 113 struct list_head port_list; 114 spinlock_t send_lock; 115 wait_queue_head_t recv_wait; 116 struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS]; 117 int agents_dead; 118 u8 use_pkey_index; 119 u8 already_used; 120 }; 121 122 struct ib_umad_packet { 123 struct ib_mad_send_buf *msg; 124 struct ib_mad_recv_wc *recv_wc; 125 struct list_head list; 126 int length; 127 struct ib_user_mad mad; 128 }; 129 130 static struct class *umad_class; 131 132 #define base_dev MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE) 133 134 static DEFINE_SPINLOCK(port_lock); 135 static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS); 136 137 static void ib_umad_add_one(struct ib_device *device); 138 static void ib_umad_remove_one(struct ib_device *device, void *client_data); 139 140 static void ib_umad_release_dev(struct kobject *kobj) 141 { 142 struct ib_umad_device *dev = 143 container_of(kobj, struct ib_umad_device, kobj); 144 145 kfree(dev); 146 } 147 148 static struct kobj_type ib_umad_dev_ktype = { 149 .release = ib_umad_release_dev, 150 }; 151 152 static int hdr_size(struct ib_umad_file *file) 153 { 154 return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) : 155 sizeof (struct ib_user_mad_hdr_old); 156 } 157 158 /* caller must hold file->mutex */ 159 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id) 160 { 161 return file->agents_dead ? NULL : file->agent[id]; 162 } 163 164 static int queue_packet(struct ib_umad_file *file, 165 struct ib_mad_agent *agent, 166 struct ib_umad_packet *packet) 167 { 168 int ret = 1; 169 170 mutex_lock(&file->mutex); 171 172 for (packet->mad.hdr.id = 0; 173 packet->mad.hdr.id < IB_UMAD_MAX_AGENTS; 174 packet->mad.hdr.id++) 175 if (agent == __get_agent(file, packet->mad.hdr.id)) { 176 list_add_tail(&packet->list, &file->recv_list); 177 wake_up_interruptible(&file->recv_wait); 178 ret = 0; 179 break; 180 } 181 182 mutex_unlock(&file->mutex); 183 184 return ret; 185 } 186 187 static void dequeue_send(struct ib_umad_file *file, 188 struct ib_umad_packet *packet) 189 { 190 spin_lock_irq(&file->send_lock); 191 list_del(&packet->list); 192 spin_unlock_irq(&file->send_lock); 193 } 194 195 static void send_handler(struct ib_mad_agent *agent, 196 struct ib_mad_send_wc *send_wc) 197 { 198 struct ib_umad_file *file = agent->context; 199 struct ib_umad_packet *packet = send_wc->send_buf->context[0]; 200 201 dequeue_send(file, packet); 202 rdma_destroy_ah(packet->msg->ah, RDMA_DESTROY_AH_SLEEPABLE); 203 ib_free_send_mad(packet->msg); 204 205 if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) { 206 packet->length = IB_MGMT_MAD_HDR; 207 packet->mad.hdr.status = ETIMEDOUT; 208 if (!queue_packet(file, agent, packet)) 209 return; 210 } 211 kfree(packet); 212 } 213 214 static void recv_handler(struct ib_mad_agent *agent, 215 struct ib_mad_send_buf *send_buf, 216 struct ib_mad_recv_wc *mad_recv_wc) 217 { 218 struct ib_umad_file *file = agent->context; 219 struct ib_umad_packet *packet; 220 221 if (mad_recv_wc->wc->status != IB_WC_SUCCESS) 222 goto err1; 223 224 packet = kzalloc(sizeof *packet, GFP_KERNEL); 225 if (!packet) 226 goto err1; 227 228 packet->length = mad_recv_wc->mad_len; 229 packet->recv_wc = mad_recv_wc; 230 231 packet->mad.hdr.status = 0; 232 packet->mad.hdr.length = hdr_size(file) + mad_recv_wc->mad_len; 233 packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp); 234 packet->mad.hdr.lid = ib_lid_be16(mad_recv_wc->wc->slid); 235 packet->mad.hdr.sl = mad_recv_wc->wc->sl; 236 packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits; 237 packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index; 238 packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH); 239 if (packet->mad.hdr.grh_present) { 240 struct rdma_ah_attr ah_attr; 241 const struct ib_global_route *grh; 242 int ret; 243 244 ret = ib_init_ah_attr_from_wc(agent->device, agent->port_num, 245 mad_recv_wc->wc, 246 mad_recv_wc->recv_buf.grh, 247 &ah_attr); 248 if (ret) 249 goto err2; 250 251 grh = rdma_ah_read_grh(&ah_attr); 252 packet->mad.hdr.gid_index = grh->sgid_index; 253 packet->mad.hdr.hop_limit = grh->hop_limit; 254 packet->mad.hdr.traffic_class = grh->traffic_class; 255 memcpy(packet->mad.hdr.gid, &grh->dgid, 16); 256 packet->mad.hdr.flow_label = cpu_to_be32(grh->flow_label); 257 rdma_destroy_ah_attr(&ah_attr); 258 } 259 260 if (queue_packet(file, agent, packet)) 261 goto err2; 262 return; 263 264 err2: 265 kfree(packet); 266 err1: 267 ib_free_recv_mad(mad_recv_wc); 268 } 269 270 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf, 271 struct ib_umad_packet *packet, size_t count) 272 { 273 struct ib_mad_recv_buf *recv_buf; 274 int left, seg_payload, offset, max_seg_payload; 275 size_t seg_size; 276 277 recv_buf = &packet->recv_wc->recv_buf; 278 seg_size = packet->recv_wc->mad_seg_size; 279 280 /* We need enough room to copy the first (or only) MAD segment. */ 281 if ((packet->length <= seg_size && 282 count < hdr_size(file) + packet->length) || 283 (packet->length > seg_size && 284 count < hdr_size(file) + seg_size)) 285 return -EINVAL; 286 287 if (copy_to_user(buf, &packet->mad, hdr_size(file))) 288 return -EFAULT; 289 290 buf += hdr_size(file); 291 seg_payload = min_t(int, packet->length, seg_size); 292 if (copy_to_user(buf, recv_buf->mad, seg_payload)) 293 return -EFAULT; 294 295 if (seg_payload < packet->length) { 296 /* 297 * Multipacket RMPP MAD message. Copy remainder of message. 298 * Note that last segment may have a shorter payload. 299 */ 300 if (count < hdr_size(file) + packet->length) { 301 /* 302 * The buffer is too small, return the first RMPP segment, 303 * which includes the RMPP message length. 304 */ 305 return -ENOSPC; 306 } 307 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class); 308 max_seg_payload = seg_size - offset; 309 310 for (left = packet->length - seg_payload, buf += seg_payload; 311 left; left -= seg_payload, buf += seg_payload) { 312 recv_buf = container_of(recv_buf->list.next, 313 struct ib_mad_recv_buf, list); 314 seg_payload = min(left, max_seg_payload); 315 if (copy_to_user(buf, (char *)recv_buf->mad + offset, 316 seg_payload)) 317 return -EFAULT; 318 } 319 } 320 return hdr_size(file) + packet->length; 321 } 322 323 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf, 324 struct ib_umad_packet *packet, size_t count) 325 { 326 ssize_t size = hdr_size(file) + packet->length; 327 328 if (count < size) 329 return -EINVAL; 330 331 if (copy_to_user(buf, &packet->mad, hdr_size(file))) 332 return -EFAULT; 333 334 buf += hdr_size(file); 335 336 if (copy_to_user(buf, packet->mad.data, packet->length)) 337 return -EFAULT; 338 339 return size; 340 } 341 342 static ssize_t ib_umad_read(struct file *filp, char __user *buf, 343 size_t count, loff_t *pos) 344 { 345 struct ib_umad_file *file = filp->private_data; 346 struct ib_umad_packet *packet; 347 ssize_t ret; 348 349 if (count < hdr_size(file)) 350 return -EINVAL; 351 352 mutex_lock(&file->mutex); 353 354 while (list_empty(&file->recv_list)) { 355 mutex_unlock(&file->mutex); 356 357 if (filp->f_flags & O_NONBLOCK) 358 return -EAGAIN; 359 360 if (wait_event_interruptible(file->recv_wait, 361 !list_empty(&file->recv_list))) 362 return -ERESTARTSYS; 363 364 mutex_lock(&file->mutex); 365 } 366 367 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list); 368 list_del(&packet->list); 369 370 mutex_unlock(&file->mutex); 371 372 if (packet->recv_wc) 373 ret = copy_recv_mad(file, buf, packet, count); 374 else 375 ret = copy_send_mad(file, buf, packet, count); 376 377 if (ret < 0) { 378 /* Requeue packet */ 379 mutex_lock(&file->mutex); 380 list_add(&packet->list, &file->recv_list); 381 mutex_unlock(&file->mutex); 382 } else { 383 if (packet->recv_wc) 384 ib_free_recv_mad(packet->recv_wc); 385 kfree(packet); 386 } 387 return ret; 388 } 389 390 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf) 391 { 392 int left, seg; 393 394 /* Copy class specific header */ 395 if ((msg->hdr_len > IB_MGMT_RMPP_HDR) && 396 copy_from_user((char *)msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR, 397 msg->hdr_len - IB_MGMT_RMPP_HDR)) 398 return -EFAULT; 399 400 /* All headers are in place. Copy data segments. */ 401 for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0; 402 seg++, left -= msg->seg_size, buf += msg->seg_size) { 403 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf, 404 min(left, msg->seg_size))) 405 return -EFAULT; 406 } 407 return 0; 408 } 409 410 static int same_destination(struct ib_user_mad_hdr *hdr1, 411 struct ib_user_mad_hdr *hdr2) 412 { 413 if (!hdr1->grh_present && !hdr2->grh_present) 414 return (hdr1->lid == hdr2->lid); 415 416 if (hdr1->grh_present && hdr2->grh_present) 417 return !memcmp(hdr1->gid, hdr2->gid, 16); 418 419 return 0; 420 } 421 422 static int is_duplicate(struct ib_umad_file *file, 423 struct ib_umad_packet *packet) 424 { 425 struct ib_umad_packet *sent_packet; 426 struct ib_mad_hdr *sent_hdr, *hdr; 427 428 hdr = (struct ib_mad_hdr *) packet->mad.data; 429 list_for_each_entry(sent_packet, &file->send_list, list) { 430 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data; 431 432 if ((hdr->tid != sent_hdr->tid) || 433 (hdr->mgmt_class != sent_hdr->mgmt_class)) 434 continue; 435 436 /* 437 * No need to be overly clever here. If two new operations have 438 * the same TID, reject the second as a duplicate. This is more 439 * restrictive than required by the spec. 440 */ 441 if (!ib_response_mad(hdr)) { 442 if (!ib_response_mad(sent_hdr)) 443 return 1; 444 continue; 445 } else if (!ib_response_mad(sent_hdr)) 446 continue; 447 448 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr)) 449 return 1; 450 } 451 452 return 0; 453 } 454 455 static ssize_t ib_umad_write(struct file *filp, const char __user *buf, 456 size_t count, loff_t *pos) 457 { 458 struct ib_umad_file *file = filp->private_data; 459 struct ib_umad_packet *packet; 460 struct ib_mad_agent *agent; 461 struct rdma_ah_attr ah_attr; 462 struct ib_ah *ah; 463 struct ib_rmpp_mad *rmpp_mad; 464 __be64 *tid; 465 int ret, data_len, hdr_len, copy_offset, rmpp_active; 466 u8 base_version; 467 468 if (count < hdr_size(file) + IB_MGMT_RMPP_HDR) 469 return -EINVAL; 470 471 packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL); 472 if (!packet) 473 return -ENOMEM; 474 475 if (copy_from_user(&packet->mad, buf, hdr_size(file))) { 476 ret = -EFAULT; 477 goto err; 478 } 479 480 if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) { 481 ret = -EINVAL; 482 goto err; 483 } 484 485 buf += hdr_size(file); 486 487 if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) { 488 ret = -EFAULT; 489 goto err; 490 } 491 492 mutex_lock(&file->mutex); 493 494 agent = __get_agent(file, packet->mad.hdr.id); 495 if (!agent) { 496 ret = -EINVAL; 497 goto err_up; 498 } 499 500 memset(&ah_attr, 0, sizeof ah_attr); 501 ah_attr.type = rdma_ah_find_type(file->port->ib_dev, 502 file->port->port_num); 503 rdma_ah_set_dlid(&ah_attr, be16_to_cpu(packet->mad.hdr.lid)); 504 rdma_ah_set_sl(&ah_attr, packet->mad.hdr.sl); 505 rdma_ah_set_path_bits(&ah_attr, packet->mad.hdr.path_bits); 506 rdma_ah_set_port_num(&ah_attr, file->port->port_num); 507 if (packet->mad.hdr.grh_present) { 508 rdma_ah_set_grh(&ah_attr, NULL, 509 be32_to_cpu(packet->mad.hdr.flow_label), 510 packet->mad.hdr.gid_index, 511 packet->mad.hdr.hop_limit, 512 packet->mad.hdr.traffic_class); 513 rdma_ah_set_dgid_raw(&ah_attr, packet->mad.hdr.gid); 514 } 515 516 ah = rdma_create_user_ah(agent->qp->pd, &ah_attr, NULL); 517 if (IS_ERR(ah)) { 518 ret = PTR_ERR(ah); 519 goto err_up; 520 } 521 522 rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data; 523 hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class); 524 525 if (ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class) 526 && ib_mad_kernel_rmpp_agent(agent)) { 527 copy_offset = IB_MGMT_RMPP_HDR; 528 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 529 IB_MGMT_RMPP_FLAG_ACTIVE; 530 } else { 531 copy_offset = IB_MGMT_MAD_HDR; 532 rmpp_active = 0; 533 } 534 535 base_version = ((struct ib_mad_hdr *)&packet->mad.data)->base_version; 536 data_len = count - hdr_size(file) - hdr_len; 537 packet->msg = ib_create_send_mad(agent, 538 be32_to_cpu(packet->mad.hdr.qpn), 539 packet->mad.hdr.pkey_index, rmpp_active, 540 hdr_len, data_len, GFP_KERNEL, 541 base_version); 542 if (IS_ERR(packet->msg)) { 543 ret = PTR_ERR(packet->msg); 544 goto err_ah; 545 } 546 547 packet->msg->ah = ah; 548 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms; 549 packet->msg->retries = packet->mad.hdr.retries; 550 packet->msg->context[0] = packet; 551 552 /* Copy MAD header. Any RMPP header is already in place. */ 553 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR); 554 555 if (!rmpp_active) { 556 if (copy_from_user((char *)packet->msg->mad + copy_offset, 557 buf + copy_offset, 558 hdr_len + data_len - copy_offset)) { 559 ret = -EFAULT; 560 goto err_msg; 561 } 562 } else { 563 ret = copy_rmpp_mad(packet->msg, buf); 564 if (ret) 565 goto err_msg; 566 } 567 568 /* 569 * Set the high-order part of the transaction ID to make MADs from 570 * different agents unique, and allow routing responses back to the 571 * original requestor. 572 */ 573 if (!ib_response_mad(packet->msg->mad)) { 574 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid; 575 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 | 576 (be64_to_cpup(tid) & 0xffffffff)); 577 rmpp_mad->mad_hdr.tid = *tid; 578 } 579 580 if (!ib_mad_kernel_rmpp_agent(agent) 581 && ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class) 582 && (ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE)) { 583 spin_lock_irq(&file->send_lock); 584 list_add_tail(&packet->list, &file->send_list); 585 spin_unlock_irq(&file->send_lock); 586 } else { 587 spin_lock_irq(&file->send_lock); 588 ret = is_duplicate(file, packet); 589 if (!ret) 590 list_add_tail(&packet->list, &file->send_list); 591 spin_unlock_irq(&file->send_lock); 592 if (ret) { 593 ret = -EINVAL; 594 goto err_msg; 595 } 596 } 597 598 ret = ib_post_send_mad(packet->msg, NULL); 599 if (ret) 600 goto err_send; 601 602 mutex_unlock(&file->mutex); 603 return count; 604 605 err_send: 606 dequeue_send(file, packet); 607 err_msg: 608 ib_free_send_mad(packet->msg); 609 err_ah: 610 rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE); 611 err_up: 612 mutex_unlock(&file->mutex); 613 err: 614 kfree(packet); 615 return ret; 616 } 617 618 static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait) 619 { 620 struct ib_umad_file *file = filp->private_data; 621 622 /* we will always be able to post a MAD send */ 623 unsigned int mask = POLLOUT | POLLWRNORM; 624 625 poll_wait(filp, &file->recv_wait, wait); 626 627 if (!list_empty(&file->recv_list)) 628 mask |= POLLIN | POLLRDNORM; 629 630 return mask; 631 } 632 633 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg, 634 int compat_method_mask) 635 { 636 struct ib_user_mad_reg_req ureq; 637 struct ib_mad_reg_req req; 638 struct ib_mad_agent *agent = NULL; 639 int agent_id; 640 int ret; 641 642 mutex_lock(&file->port->file_mutex); 643 mutex_lock(&file->mutex); 644 645 if (!file->port->ib_dev) { 646 dev_notice(file->port->dev, 647 "ib_umad_reg_agent: invalid device\n"); 648 ret = -EPIPE; 649 goto out; 650 } 651 652 if (copy_from_user(&ureq, arg, sizeof ureq)) { 653 ret = -EFAULT; 654 goto out; 655 } 656 657 if (ureq.qpn != 0 && ureq.qpn != 1) { 658 dev_notice(file->port->dev, 659 "ib_umad_reg_agent: invalid QPN %d specified\n", 660 ureq.qpn); 661 ret = -EINVAL; 662 goto out; 663 } 664 665 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id) 666 if (!__get_agent(file, agent_id)) 667 goto found; 668 669 dev_notice(file->port->dev, 670 "ib_umad_reg_agent: Max Agents (%u) reached\n", 671 IB_UMAD_MAX_AGENTS); 672 ret = -ENOMEM; 673 goto out; 674 675 found: 676 if (ureq.mgmt_class) { 677 memset(&req, 0, sizeof(req)); 678 req.mgmt_class = ureq.mgmt_class; 679 req.mgmt_class_version = ureq.mgmt_class_version; 680 memcpy(req.oui, ureq.oui, sizeof req.oui); 681 682 if (compat_method_mask) { 683 u32 *umm = (u32 *) ureq.method_mask; 684 int i; 685 686 for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i) 687 req.method_mask[i] = 688 umm[i * 2] | ((u64) umm[i * 2 + 1] << 32); 689 } else 690 memcpy(req.method_mask, ureq.method_mask, 691 sizeof req.method_mask); 692 } 693 694 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num, 695 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI, 696 ureq.mgmt_class ? &req : NULL, 697 ureq.rmpp_version, 698 send_handler, recv_handler, file, 0); 699 if (IS_ERR(agent)) { 700 ret = PTR_ERR(agent); 701 agent = NULL; 702 goto out; 703 } 704 705 if (put_user(agent_id, 706 (u32 __user *) ((char *)arg + offsetof(struct ib_user_mad_reg_req, id)))) { 707 ret = -EFAULT; 708 goto out; 709 } 710 711 if (!file->already_used) { 712 file->already_used = 1; 713 if (!file->use_pkey_index) { 714 dev_warn(file->port->dev, 715 "process %s did not enable P_Key index support.\n", 716 current->comm); 717 dev_warn(file->port->dev, 718 " Documentation/infiniband/user_mad.txt has info on the new ABI.\n"); 719 } 720 } 721 722 file->agent[agent_id] = agent; 723 ret = 0; 724 725 out: 726 mutex_unlock(&file->mutex); 727 728 if (ret && agent) 729 ib_unregister_mad_agent(agent); 730 731 mutex_unlock(&file->port->file_mutex); 732 733 return ret; 734 } 735 736 static int ib_umad_reg_agent2(struct ib_umad_file *file, void __user *arg) 737 { 738 struct ib_user_mad_reg_req2 ureq; 739 struct ib_mad_reg_req req; 740 struct ib_mad_agent *agent = NULL; 741 int agent_id; 742 int ret; 743 744 mutex_lock(&file->port->file_mutex); 745 mutex_lock(&file->mutex); 746 747 if (!file->port->ib_dev) { 748 dev_notice(file->port->dev, 749 "ib_umad_reg_agent2: invalid device\n"); 750 ret = -EPIPE; 751 goto out; 752 } 753 754 if (copy_from_user(&ureq, arg, sizeof(ureq))) { 755 ret = -EFAULT; 756 goto out; 757 } 758 759 if (ureq.qpn != 0 && ureq.qpn != 1) { 760 dev_notice(file->port->dev, 761 "ib_umad_reg_agent2: invalid QPN %d specified\n", 762 ureq.qpn); 763 ret = -EINVAL; 764 goto out; 765 } 766 767 if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) { 768 const u32 flags = IB_USER_MAD_REG_FLAGS_CAP; 769 dev_notice(file->port->dev, 770 "ib_umad_reg_agent2 failed: invalid registration flags specified 0x%x; supported 0x%x\n", 771 ureq.flags, IB_USER_MAD_REG_FLAGS_CAP); 772 ret = -EINVAL; 773 774 if (put_user(flags, 775 (u32 __user *) ((char *)arg + offsetof(struct 776 ib_user_mad_reg_req2, flags)))) 777 ret = -EFAULT; 778 779 goto out; 780 } 781 782 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id) 783 if (!__get_agent(file, agent_id)) 784 goto found; 785 786 dev_notice(file->port->dev, 787 "ib_umad_reg_agent2: Max Agents (%u) reached\n", 788 IB_UMAD_MAX_AGENTS); 789 ret = -ENOMEM; 790 goto out; 791 792 found: 793 if (ureq.mgmt_class) { 794 memset(&req, 0, sizeof(req)); 795 req.mgmt_class = ureq.mgmt_class; 796 req.mgmt_class_version = ureq.mgmt_class_version; 797 if (ureq.oui & 0xff000000) { 798 dev_notice(file->port->dev, 799 "ib_umad_reg_agent2 failed: oui invalid 0x%08x\n", 800 ureq.oui); 801 ret = -EINVAL; 802 goto out; 803 } 804 req.oui[2] = ureq.oui & 0x0000ff; 805 req.oui[1] = (ureq.oui & 0x00ff00) >> 8; 806 req.oui[0] = (ureq.oui & 0xff0000) >> 16; 807 memcpy(req.method_mask, ureq.method_mask, 808 sizeof(req.method_mask)); 809 } 810 811 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num, 812 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI, 813 ureq.mgmt_class ? &req : NULL, 814 ureq.rmpp_version, 815 send_handler, recv_handler, file, 816 ureq.flags); 817 if (IS_ERR(agent)) { 818 ret = PTR_ERR(agent); 819 agent = NULL; 820 goto out; 821 } 822 823 if (put_user(agent_id, 824 (u32 __user *)((char *)arg + 825 offsetof(struct ib_user_mad_reg_req2, id)))) { 826 ret = -EFAULT; 827 goto out; 828 } 829 830 if (!file->already_used) { 831 file->already_used = 1; 832 file->use_pkey_index = 1; 833 } 834 835 file->agent[agent_id] = agent; 836 ret = 0; 837 838 out: 839 mutex_unlock(&file->mutex); 840 841 if (ret && agent) 842 ib_unregister_mad_agent(agent); 843 844 mutex_unlock(&file->port->file_mutex); 845 846 return ret; 847 } 848 849 850 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg) 851 { 852 struct ib_mad_agent *agent = NULL; 853 u32 id; 854 int ret = 0; 855 856 if (get_user(id, arg)) 857 return -EFAULT; 858 859 mutex_lock(&file->port->file_mutex); 860 mutex_lock(&file->mutex); 861 862 if (id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) { 863 ret = -EINVAL; 864 goto out; 865 } 866 867 agent = file->agent[id]; 868 file->agent[id] = NULL; 869 870 out: 871 mutex_unlock(&file->mutex); 872 873 if (agent) 874 ib_unregister_mad_agent(agent); 875 876 mutex_unlock(&file->port->file_mutex); 877 878 return ret; 879 } 880 881 static long ib_umad_enable_pkey(struct ib_umad_file *file) 882 { 883 int ret = 0; 884 885 mutex_lock(&file->mutex); 886 if (file->already_used) 887 ret = -EINVAL; 888 else 889 file->use_pkey_index = 1; 890 mutex_unlock(&file->mutex); 891 892 return ret; 893 } 894 895 static long ib_umad_ioctl(struct file *filp, unsigned int cmd, 896 unsigned long arg) 897 { 898 switch (cmd) { 899 case IB_USER_MAD_REGISTER_AGENT: 900 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0); 901 case IB_USER_MAD_UNREGISTER_AGENT: 902 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg); 903 case IB_USER_MAD_ENABLE_PKEY: 904 return ib_umad_enable_pkey(filp->private_data); 905 case IB_USER_MAD_REGISTER_AGENT2: 906 return ib_umad_reg_agent2(filp->private_data, (void __user *) arg); 907 default: 908 return -ENOIOCTLCMD; 909 } 910 } 911 912 #ifdef CONFIG_COMPAT 913 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd, 914 unsigned long arg) 915 { 916 switch (cmd) { 917 case IB_USER_MAD_REGISTER_AGENT: 918 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1); 919 case IB_USER_MAD_UNREGISTER_AGENT: 920 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg)); 921 case IB_USER_MAD_ENABLE_PKEY: 922 return ib_umad_enable_pkey(filp->private_data); 923 case IB_USER_MAD_REGISTER_AGENT2: 924 return ib_umad_reg_agent2(filp->private_data, compat_ptr(arg)); 925 default: 926 return -ENOIOCTLCMD; 927 } 928 } 929 #endif 930 931 /* 932 * ib_umad_open() does not need the BKL: 933 * 934 * - the ib_umad_port structures are properly reference counted, and 935 * everything else is purely local to the file being created, so 936 * races against other open calls are not a problem; 937 * - the ioctl method does not affect any global state outside of the 938 * file structure being operated on; 939 */ 940 static int ib_umad_open(struct inode *inode, struct file *filp) 941 { 942 struct ib_umad_port *port; 943 struct ib_umad_file *file; 944 int ret = -ENXIO; 945 946 port = container_of(inode->i_cdev->si_drv1, struct ib_umad_port, cdev); 947 948 mutex_lock(&port->file_mutex); 949 950 if (!port->ib_dev) 951 goto out; 952 953 ret = -ENOMEM; 954 file = kzalloc(sizeof *file, GFP_KERNEL); 955 if (!file) 956 goto out; 957 958 mutex_init(&file->mutex); 959 spin_lock_init(&file->send_lock); 960 INIT_LIST_HEAD(&file->recv_list); 961 INIT_LIST_HEAD(&file->send_list); 962 init_waitqueue_head(&file->recv_wait); 963 964 file->port = port; 965 filp->private_data = file; 966 967 list_add_tail(&file->port_list, &port->file_list); 968 969 ret = nonseekable_open(inode, filp); 970 if (ret) { 971 list_del(&file->port_list); 972 kfree(file); 973 goto out; 974 } 975 976 kobject_get(&port->umad_dev->kobj); 977 978 out: 979 mutex_unlock(&port->file_mutex); 980 return ret; 981 } 982 983 static int ib_umad_close(struct inode *inode, struct file *filp) 984 { 985 struct ib_umad_file *file = filp->private_data; 986 struct ib_umad_device *dev = file->port->umad_dev; 987 struct ib_umad_packet *packet, *tmp; 988 int already_dead; 989 int i; 990 991 mutex_lock(&file->port->file_mutex); 992 mutex_lock(&file->mutex); 993 994 already_dead = file->agents_dead; 995 file->agents_dead = 1; 996 997 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) { 998 if (packet->recv_wc) 999 ib_free_recv_mad(packet->recv_wc); 1000 kfree(packet); 1001 } 1002 1003 list_del(&file->port_list); 1004 1005 mutex_unlock(&file->mutex); 1006 1007 if (!already_dead) 1008 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i) 1009 if (file->agent[i]) 1010 ib_unregister_mad_agent(file->agent[i]); 1011 1012 mutex_unlock(&file->port->file_mutex); 1013 1014 kfree(file); 1015 kobject_put(&dev->kobj); 1016 1017 return 0; 1018 } 1019 1020 static const struct file_operations umad_fops = { 1021 .owner = THIS_MODULE, 1022 .read = ib_umad_read, 1023 .write = ib_umad_write, 1024 .poll = ib_umad_poll, 1025 .unlocked_ioctl = ib_umad_ioctl, 1026 #ifdef CONFIG_COMPAT 1027 .compat_ioctl = ib_umad_compat_ioctl, 1028 #endif 1029 .open = ib_umad_open, 1030 .release = ib_umad_close, 1031 .llseek = no_llseek, 1032 }; 1033 1034 static int ib_umad_sm_open(struct inode *inode, struct file *filp) 1035 { 1036 struct ib_umad_port *port; 1037 struct ib_port_modify props = { 1038 .set_port_cap_mask = IB_PORT_SM 1039 }; 1040 int ret; 1041 1042 port = container_of(inode->i_cdev->si_drv1, struct ib_umad_port, sm_cdev); 1043 1044 if (filp->f_flags & O_NONBLOCK) { 1045 if (down_trylock(&port->sm_sem)) { 1046 ret = -EAGAIN; 1047 goto fail; 1048 } 1049 } else { 1050 if (down_interruptible(&port->sm_sem)) { 1051 ret = -ERESTARTSYS; 1052 goto fail; 1053 } 1054 } 1055 1056 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props); 1057 if (ret) 1058 goto err_up_sem; 1059 1060 filp->private_data = port; 1061 1062 ret = nonseekable_open(inode, filp); 1063 if (ret) 1064 goto err_clr_sm_cap; 1065 1066 kobject_get(&port->umad_dev->kobj); 1067 1068 return 0; 1069 1070 err_clr_sm_cap: 1071 swap(props.set_port_cap_mask, props.clr_port_cap_mask); 1072 ib_modify_port(port->ib_dev, port->port_num, 0, &props); 1073 1074 err_up_sem: 1075 up(&port->sm_sem); 1076 1077 fail: 1078 return ret; 1079 } 1080 1081 static int ib_umad_sm_close(struct inode *inode, struct file *filp) 1082 { 1083 struct ib_umad_port *port = filp->private_data; 1084 struct ib_port_modify props = { 1085 .clr_port_cap_mask = IB_PORT_SM 1086 }; 1087 int ret = 0; 1088 1089 mutex_lock(&port->file_mutex); 1090 if (port->ib_dev) 1091 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props); 1092 mutex_unlock(&port->file_mutex); 1093 1094 up(&port->sm_sem); 1095 1096 kobject_put(&port->umad_dev->kobj); 1097 1098 return ret; 1099 } 1100 1101 static const struct file_operations umad_sm_fops = { 1102 .owner = THIS_MODULE, 1103 .open = ib_umad_sm_open, 1104 .release = ib_umad_sm_close, 1105 .llseek = no_llseek, 1106 }; 1107 1108 static struct ib_client umad_client = { 1109 .name = "umad", 1110 .add = ib_umad_add_one, 1111 .remove = ib_umad_remove_one 1112 }; 1113 1114 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr, 1115 char *buf) 1116 { 1117 struct ib_umad_port *port = dev_get_drvdata(dev); 1118 1119 if (!port) 1120 return -ENODEV; 1121 1122 return sprintf(buf, "%s\n", port->ib_dev->name); 1123 } 1124 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 1125 1126 static ssize_t show_port(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, "%d\n", port->port_num); 1135 } 1136 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL); 1137 1138 static CLASS_ATTR_STRING(abi_version, S_IRUGO, 1139 __stringify(IB_USER_MAD_ABI_VERSION)); 1140 1141 static dev_t overflow_maj; 1142 static DECLARE_BITMAP(overflow_map, IB_UMAD_MAX_PORTS); 1143 static int find_overflow_devnum(struct ib_device *device) 1144 { 1145 int ret; 1146 1147 if (!overflow_maj) { 1148 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UMAD_MAX_PORTS * 2, 1149 "infiniband_mad"); 1150 if (ret) { 1151 dev_err(&device->dev, 1152 "couldn't register dynamic device number\n"); 1153 return ret; 1154 } 1155 } 1156 1157 ret = find_first_zero_bit(overflow_map, IB_UMAD_MAX_PORTS); 1158 if (ret >= IB_UMAD_MAX_PORTS) 1159 return -1; 1160 1161 return ret; 1162 } 1163 1164 static int ib_umad_init_port(struct ib_device *device, int port_num, 1165 struct ib_umad_device *umad_dev, 1166 struct ib_umad_port *port) 1167 { 1168 int devnum; 1169 dev_t base; 1170 1171 spin_lock(&port_lock); 1172 devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS); 1173 if (devnum >= IB_UMAD_MAX_PORTS) { 1174 spin_unlock(&port_lock); 1175 devnum = find_overflow_devnum(device); 1176 if (devnum < 0) 1177 return -1; 1178 1179 spin_lock(&port_lock); 1180 port->dev_num = devnum + IB_UMAD_MAX_PORTS; 1181 base = devnum + overflow_maj; 1182 set_bit(devnum, overflow_map); 1183 } else { 1184 port->dev_num = devnum; 1185 base = devnum + base_dev; 1186 set_bit(devnum, dev_map); 1187 } 1188 spin_unlock(&port_lock); 1189 1190 port->ib_dev = device; 1191 port->port_num = port_num; 1192 sema_init(&port->sm_sem, 1); 1193 mutex_init(&port->file_mutex); 1194 INIT_LIST_HEAD(&port->file_list); 1195 1196 cdev_init(&port->cdev, &umad_fops); 1197 port->cdev.owner = THIS_MODULE; 1198 port->cdev.kobj.parent = &umad_dev->kobj; 1199 kobject_set_name(&port->cdev.kobj, "umad%d", port->dev_num); 1200 if (cdev_add(&port->cdev, base, 1)) 1201 goto err_cdev; 1202 1203 port->dev = device_create(umad_class, device->dma_device, 1204 port->cdev.dev, port, 1205 "umad%d", port->dev_num); 1206 if (IS_ERR(port->dev)) 1207 goto err_cdev; 1208 1209 if (device_create_file(port->dev, &dev_attr_ibdev)) 1210 goto err_dev; 1211 if (device_create_file(port->dev, &dev_attr_port)) 1212 goto err_dev; 1213 1214 base += IB_UMAD_MAX_PORTS; 1215 cdev_init(&port->sm_cdev, &umad_sm_fops); 1216 port->sm_cdev.owner = THIS_MODULE; 1217 port->sm_cdev.kobj.parent = &umad_dev->kobj; 1218 kobject_set_name(&port->sm_cdev.kobj, "issm%d", port->dev_num); 1219 if (cdev_add(&port->sm_cdev, base, 1)) 1220 goto err_sm_cdev; 1221 1222 port->sm_dev = device_create(umad_class, device->dma_device, 1223 port->sm_cdev.dev, port, 1224 "issm%d", port->dev_num); 1225 if (IS_ERR(port->sm_dev)) 1226 goto err_sm_cdev; 1227 1228 if (device_create_file(port->sm_dev, &dev_attr_ibdev)) 1229 goto err_sm_dev; 1230 if (device_create_file(port->sm_dev, &dev_attr_port)) 1231 goto err_sm_dev; 1232 1233 return 0; 1234 1235 err_sm_dev: 1236 device_destroy(umad_class, port->sm_cdev.dev); 1237 1238 err_sm_cdev: 1239 cdev_del(&port->sm_cdev); 1240 1241 err_dev: 1242 device_destroy(umad_class, port->cdev.dev); 1243 1244 err_cdev: 1245 cdev_del(&port->cdev); 1246 if (port->dev_num < IB_UMAD_MAX_PORTS) 1247 clear_bit(devnum, dev_map); 1248 else 1249 clear_bit(devnum, overflow_map); 1250 1251 return -1; 1252 } 1253 1254 static void ib_umad_kill_port(struct ib_umad_port *port) 1255 { 1256 struct ib_umad_file *file; 1257 int id; 1258 1259 dev_set_drvdata(port->dev, NULL); 1260 dev_set_drvdata(port->sm_dev, NULL); 1261 1262 device_destroy(umad_class, port->cdev.dev); 1263 device_destroy(umad_class, port->sm_cdev.dev); 1264 1265 cdev_del(&port->cdev); 1266 cdev_del(&port->sm_cdev); 1267 1268 mutex_lock(&port->file_mutex); 1269 1270 port->ib_dev = NULL; 1271 1272 list_for_each_entry(file, &port->file_list, port_list) { 1273 mutex_lock(&file->mutex); 1274 file->agents_dead = 1; 1275 mutex_unlock(&file->mutex); 1276 1277 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id) 1278 if (file->agent[id]) 1279 ib_unregister_mad_agent(file->agent[id]); 1280 } 1281 1282 mutex_unlock(&port->file_mutex); 1283 1284 if (port->dev_num < IB_UMAD_MAX_PORTS) 1285 clear_bit(port->dev_num, dev_map); 1286 else 1287 clear_bit(port->dev_num - IB_UMAD_MAX_PORTS, overflow_map); 1288 } 1289 1290 static void ib_umad_add_one(struct ib_device *device) 1291 { 1292 struct ib_umad_device *umad_dev; 1293 int s, e, i; 1294 int count = 0; 1295 1296 s = rdma_start_port(device); 1297 e = rdma_end_port(device); 1298 1299 umad_dev = kzalloc(sizeof *umad_dev + 1300 (e - s + 1) * sizeof (struct ib_umad_port), 1301 GFP_KERNEL); 1302 if (!umad_dev) 1303 return; 1304 1305 kobject_init(&umad_dev->kobj, &ib_umad_dev_ktype); 1306 1307 for (i = s; i <= e; ++i) { 1308 if (!rdma_cap_ib_mad(device, i)) 1309 continue; 1310 1311 umad_dev->port[i - s].umad_dev = umad_dev; 1312 1313 if (ib_umad_init_port(device, i, umad_dev, 1314 &umad_dev->port[i - s])) 1315 goto err; 1316 1317 count++; 1318 } 1319 1320 if (!count) 1321 goto free; 1322 1323 ib_set_client_data(device, &umad_client, umad_dev); 1324 1325 return; 1326 1327 err: 1328 while (--i >= s) { 1329 if (!rdma_cap_ib_mad(device, i)) 1330 continue; 1331 1332 ib_umad_kill_port(&umad_dev->port[i - s]); 1333 } 1334 free: 1335 kobject_put(&umad_dev->kobj); 1336 } 1337 1338 static void ib_umad_remove_one(struct ib_device *device, void *client_data) 1339 { 1340 struct ib_umad_device *umad_dev = client_data; 1341 int i; 1342 1343 if (!umad_dev) 1344 return; 1345 1346 for (i = 0; i <= rdma_end_port(device) - rdma_start_port(device); ++i) { 1347 if (rdma_cap_ib_mad(device, i + rdma_start_port(device))) 1348 ib_umad_kill_port(&umad_dev->port[i]); 1349 } 1350 1351 kobject_put(&umad_dev->kobj); 1352 } 1353 1354 static char *umad_devnode(struct device *dev, umode_t *mode) 1355 { 1356 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 1357 } 1358 1359 static int __init ib_umad_init(void) 1360 { 1361 int ret; 1362 1363 ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2, 1364 "infiniband_mad"); 1365 if (ret) { 1366 pr_err("couldn't register device number\n"); 1367 goto out; 1368 } 1369 1370 umad_class = class_create(THIS_MODULE, "infiniband_mad"); 1371 if (IS_ERR(umad_class)) { 1372 ret = PTR_ERR(umad_class); 1373 pr_err("couldn't create class infiniband_mad\n"); 1374 goto out_chrdev; 1375 } 1376 1377 umad_class->devnode = umad_devnode; 1378 1379 ret = class_create_file(umad_class, &class_attr_abi_version.attr); 1380 if (ret) { 1381 pr_err("couldn't create abi_version attribute\n"); 1382 goto out_class; 1383 } 1384 1385 ret = ib_register_client(&umad_client); 1386 if (ret) { 1387 pr_err("couldn't register ib_umad client\n"); 1388 goto out_class; 1389 } 1390 1391 return 0; 1392 1393 out_class: 1394 class_destroy(umad_class); 1395 1396 out_chrdev: 1397 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2); 1398 1399 out: 1400 return ret; 1401 } 1402 1403 static void __exit ib_umad_cleanup(void) 1404 { 1405 ib_unregister_client(&umad_client); 1406 class_destroy(umad_class); 1407 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2); 1408 if (overflow_maj) 1409 unregister_chrdev_region(overflow_maj, IB_UMAD_MAX_PORTS * 2); 1410 } 1411 1412 module_init_order(ib_umad_init, SI_ORDER_FIFTH); 1413 module_exit_order(ib_umad_cleanup, SI_ORDER_FIFTH); 1414