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 #include <linux/nospec.h> 53 54 #include <linux/uaccess.h> 55 56 #include <rdma/ib_mad.h> 57 #include <rdma/ib_user_mad.h> 58 #include <rdma/rdma_netlink.h> 59 60 #include "core_priv.h" 61 62 MODULE_AUTHOR("Roland Dreier"); 63 MODULE_DESCRIPTION("InfiniBand userspace MAD packet access"); 64 MODULE_LICENSE("Dual BSD/GPL"); 65 66 enum { 67 IB_UMAD_MAX_PORTS = RDMA_MAX_PORTS, 68 IB_UMAD_MAX_AGENTS = 32, 69 70 IB_UMAD_MAJOR = 231, 71 IB_UMAD_MINOR_BASE = 0, 72 IB_UMAD_NUM_FIXED_MINOR = 64, 73 IB_UMAD_NUM_DYNAMIC_MINOR = IB_UMAD_MAX_PORTS - IB_UMAD_NUM_FIXED_MINOR, 74 IB_ISSM_MINOR_BASE = IB_UMAD_NUM_FIXED_MINOR, 75 }; 76 77 /* 78 * Our lifetime rules for these structs are the following: 79 * device special file is opened, we take a reference on the 80 * ib_umad_port's struct ib_umad_device. We drop these 81 * references in the corresponding close(). 82 * 83 * In addition to references coming from open character devices, there 84 * is one more reference to each ib_umad_device representing the 85 * module's reference taken when allocating the ib_umad_device in 86 * ib_umad_add_one(). 87 * 88 * When destroying an ib_umad_device, we drop the module's reference. 89 */ 90 91 struct ib_umad_port { 92 struct cdev cdev; 93 struct device dev; 94 struct cdev sm_cdev; 95 struct device sm_dev; 96 struct semaphore sm_sem; 97 98 struct mutex file_mutex; 99 struct list_head file_list; 100 101 struct ib_device *ib_dev; 102 struct ib_umad_device *umad_dev; 103 int dev_num; 104 u8 port_num; 105 }; 106 107 struct ib_umad_device { 108 struct kref kref; 109 struct ib_umad_port ports[]; 110 }; 111 112 struct ib_umad_file { 113 struct mutex mutex; 114 struct ib_umad_port *port; 115 struct list_head recv_list; 116 struct list_head send_list; 117 struct list_head port_list; 118 spinlock_t send_lock; 119 wait_queue_head_t recv_wait; 120 struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS]; 121 int agents_dead; 122 u8 use_pkey_index; 123 u8 already_used; 124 }; 125 126 struct ib_umad_packet { 127 struct ib_mad_send_buf *msg; 128 struct ib_mad_recv_wc *recv_wc; 129 struct list_head list; 130 int length; 131 struct ib_user_mad mad; 132 }; 133 134 #define CREATE_TRACE_POINTS 135 #include <trace/events/ib_umad.h> 136 137 static const dev_t base_umad_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE); 138 static const dev_t base_issm_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE) + 139 IB_UMAD_NUM_FIXED_MINOR; 140 static dev_t dynamic_umad_dev; 141 static dev_t dynamic_issm_dev; 142 143 static DEFINE_IDA(umad_ida); 144 145 static int ib_umad_add_one(struct ib_device *device); 146 static void ib_umad_remove_one(struct ib_device *device, void *client_data); 147 148 static void ib_umad_dev_free(struct kref *kref) 149 { 150 struct ib_umad_device *dev = 151 container_of(kref, struct ib_umad_device, kref); 152 153 kfree(dev); 154 } 155 156 static void ib_umad_dev_get(struct ib_umad_device *dev) 157 { 158 kref_get(&dev->kref); 159 } 160 161 static void ib_umad_dev_put(struct ib_umad_device *dev) 162 { 163 kref_put(&dev->kref, ib_umad_dev_free); 164 } 165 166 static int hdr_size(struct ib_umad_file *file) 167 { 168 return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) : 169 sizeof (struct ib_user_mad_hdr_old); 170 } 171 172 /* caller must hold file->mutex */ 173 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id) 174 { 175 return file->agents_dead ? NULL : file->agent[id]; 176 } 177 178 static int queue_packet(struct ib_umad_file *file, 179 struct ib_mad_agent *agent, 180 struct ib_umad_packet *packet) 181 { 182 int ret = 1; 183 184 mutex_lock(&file->mutex); 185 186 for (packet->mad.hdr.id = 0; 187 packet->mad.hdr.id < IB_UMAD_MAX_AGENTS; 188 packet->mad.hdr.id++) 189 if (agent == __get_agent(file, packet->mad.hdr.id)) { 190 list_add_tail(&packet->list, &file->recv_list); 191 wake_up_interruptible(&file->recv_wait); 192 ret = 0; 193 break; 194 } 195 196 mutex_unlock(&file->mutex); 197 198 return ret; 199 } 200 201 static void dequeue_send(struct ib_umad_file *file, 202 struct ib_umad_packet *packet) 203 { 204 spin_lock_irq(&file->send_lock); 205 list_del(&packet->list); 206 spin_unlock_irq(&file->send_lock); 207 } 208 209 static void send_handler(struct ib_mad_agent *agent, 210 struct ib_mad_send_wc *send_wc) 211 { 212 struct ib_umad_file *file = agent->context; 213 struct ib_umad_packet *packet = send_wc->send_buf->context[0]; 214 215 dequeue_send(file, packet); 216 rdma_destroy_ah(packet->msg->ah, RDMA_DESTROY_AH_SLEEPABLE); 217 ib_free_send_mad(packet->msg); 218 219 if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) { 220 packet->length = IB_MGMT_MAD_HDR; 221 packet->mad.hdr.status = ETIMEDOUT; 222 if (!queue_packet(file, agent, packet)) 223 return; 224 } 225 kfree(packet); 226 } 227 228 static void recv_handler(struct ib_mad_agent *agent, 229 struct ib_mad_send_buf *send_buf, 230 struct ib_mad_recv_wc *mad_recv_wc) 231 { 232 struct ib_umad_file *file = agent->context; 233 struct ib_umad_packet *packet; 234 235 if (mad_recv_wc->wc->status != IB_WC_SUCCESS) 236 goto err1; 237 238 packet = kzalloc(sizeof *packet, GFP_KERNEL); 239 if (!packet) 240 goto err1; 241 242 packet->length = mad_recv_wc->mad_len; 243 packet->recv_wc = mad_recv_wc; 244 245 packet->mad.hdr.status = 0; 246 packet->mad.hdr.length = hdr_size(file) + mad_recv_wc->mad_len; 247 packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp); 248 /* 249 * On OPA devices it is okay to lose the upper 16 bits of LID as this 250 * information is obtained elsewhere. Mask off the upper 16 bits. 251 */ 252 if (rdma_cap_opa_mad(agent->device, agent->port_num)) 253 packet->mad.hdr.lid = ib_lid_be16(0xFFFF & 254 mad_recv_wc->wc->slid); 255 else 256 packet->mad.hdr.lid = ib_lid_be16(mad_recv_wc->wc->slid); 257 packet->mad.hdr.sl = mad_recv_wc->wc->sl; 258 packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits; 259 packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index; 260 packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH); 261 if (packet->mad.hdr.grh_present) { 262 struct rdma_ah_attr ah_attr; 263 const struct ib_global_route *grh; 264 int ret; 265 266 ret = ib_init_ah_attr_from_wc(agent->device, agent->port_num, 267 mad_recv_wc->wc, 268 mad_recv_wc->recv_buf.grh, 269 &ah_attr); 270 if (ret) 271 goto err2; 272 273 grh = rdma_ah_read_grh(&ah_attr); 274 packet->mad.hdr.gid_index = grh->sgid_index; 275 packet->mad.hdr.hop_limit = grh->hop_limit; 276 packet->mad.hdr.traffic_class = grh->traffic_class; 277 memcpy(packet->mad.hdr.gid, &grh->dgid, 16); 278 packet->mad.hdr.flow_label = cpu_to_be32(grh->flow_label); 279 rdma_destroy_ah_attr(&ah_attr); 280 } 281 282 if (queue_packet(file, agent, packet)) 283 goto err2; 284 return; 285 286 err2: 287 kfree(packet); 288 err1: 289 ib_free_recv_mad(mad_recv_wc); 290 } 291 292 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf, 293 struct ib_umad_packet *packet, size_t count) 294 { 295 struct ib_mad_recv_buf *recv_buf; 296 int left, seg_payload, offset, max_seg_payload; 297 size_t seg_size; 298 299 recv_buf = &packet->recv_wc->recv_buf; 300 seg_size = packet->recv_wc->mad_seg_size; 301 302 /* We need enough room to copy the first (or only) MAD segment. */ 303 if ((packet->length <= seg_size && 304 count < hdr_size(file) + packet->length) || 305 (packet->length > seg_size && 306 count < hdr_size(file) + seg_size)) 307 return -EINVAL; 308 309 if (copy_to_user(buf, &packet->mad, hdr_size(file))) 310 return -EFAULT; 311 312 buf += hdr_size(file); 313 seg_payload = min_t(int, packet->length, seg_size); 314 if (copy_to_user(buf, recv_buf->mad, seg_payload)) 315 return -EFAULT; 316 317 if (seg_payload < packet->length) { 318 /* 319 * Multipacket RMPP MAD message. Copy remainder of message. 320 * Note that last segment may have a shorter payload. 321 */ 322 if (count < hdr_size(file) + packet->length) { 323 /* 324 * The buffer is too small, return the first RMPP segment, 325 * which includes the RMPP message length. 326 */ 327 return -ENOSPC; 328 } 329 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class); 330 max_seg_payload = seg_size - offset; 331 332 for (left = packet->length - seg_payload, buf += seg_payload; 333 left; left -= seg_payload, buf += seg_payload) { 334 recv_buf = container_of(recv_buf->list.next, 335 struct ib_mad_recv_buf, list); 336 seg_payload = min(left, max_seg_payload); 337 if (copy_to_user(buf, ((void *) recv_buf->mad) + offset, 338 seg_payload)) 339 return -EFAULT; 340 } 341 } 342 343 trace_ib_umad_read_recv(file, &packet->mad.hdr, &recv_buf->mad->mad_hdr); 344 345 return hdr_size(file) + packet->length; 346 } 347 348 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf, 349 struct ib_umad_packet *packet, size_t count) 350 { 351 ssize_t size = hdr_size(file) + packet->length; 352 353 if (count < size) 354 return -EINVAL; 355 356 if (copy_to_user(buf, &packet->mad, hdr_size(file))) 357 return -EFAULT; 358 359 buf += hdr_size(file); 360 361 if (copy_to_user(buf, packet->mad.data, packet->length)) 362 return -EFAULT; 363 364 trace_ib_umad_read_send(file, &packet->mad.hdr, 365 (struct ib_mad_hdr *)&packet->mad.data); 366 367 return size; 368 } 369 370 static ssize_t ib_umad_read(struct file *filp, char __user *buf, 371 size_t count, loff_t *pos) 372 { 373 struct ib_umad_file *file = filp->private_data; 374 struct ib_umad_packet *packet; 375 ssize_t ret; 376 377 if (count < hdr_size(file)) 378 return -EINVAL; 379 380 mutex_lock(&file->mutex); 381 382 while (list_empty(&file->recv_list)) { 383 mutex_unlock(&file->mutex); 384 385 if (filp->f_flags & O_NONBLOCK) 386 return -EAGAIN; 387 388 if (wait_event_interruptible(file->recv_wait, 389 !list_empty(&file->recv_list))) 390 return -ERESTARTSYS; 391 392 mutex_lock(&file->mutex); 393 } 394 395 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list); 396 list_del(&packet->list); 397 398 mutex_unlock(&file->mutex); 399 400 if (packet->recv_wc) 401 ret = copy_recv_mad(file, buf, packet, count); 402 else 403 ret = copy_send_mad(file, buf, packet, count); 404 405 if (ret < 0) { 406 /* Requeue packet */ 407 mutex_lock(&file->mutex); 408 list_add(&packet->list, &file->recv_list); 409 mutex_unlock(&file->mutex); 410 } else { 411 if (packet->recv_wc) 412 ib_free_recv_mad(packet->recv_wc); 413 kfree(packet); 414 } 415 return ret; 416 } 417 418 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf) 419 { 420 int left, seg; 421 422 /* Copy class specific header */ 423 if ((msg->hdr_len > IB_MGMT_RMPP_HDR) && 424 copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR, 425 msg->hdr_len - IB_MGMT_RMPP_HDR)) 426 return -EFAULT; 427 428 /* All headers are in place. Copy data segments. */ 429 for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0; 430 seg++, left -= msg->seg_size, buf += msg->seg_size) { 431 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf, 432 min(left, msg->seg_size))) 433 return -EFAULT; 434 } 435 return 0; 436 } 437 438 static int same_destination(struct ib_user_mad_hdr *hdr1, 439 struct ib_user_mad_hdr *hdr2) 440 { 441 if (!hdr1->grh_present && !hdr2->grh_present) 442 return (hdr1->lid == hdr2->lid); 443 444 if (hdr1->grh_present && hdr2->grh_present) 445 return !memcmp(hdr1->gid, hdr2->gid, 16); 446 447 return 0; 448 } 449 450 static int is_duplicate(struct ib_umad_file *file, 451 struct ib_umad_packet *packet) 452 { 453 struct ib_umad_packet *sent_packet; 454 struct ib_mad_hdr *sent_hdr, *hdr; 455 456 hdr = (struct ib_mad_hdr *) packet->mad.data; 457 list_for_each_entry(sent_packet, &file->send_list, list) { 458 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data; 459 460 if ((hdr->tid != sent_hdr->tid) || 461 (hdr->mgmt_class != sent_hdr->mgmt_class)) 462 continue; 463 464 /* 465 * No need to be overly clever here. If two new operations have 466 * the same TID, reject the second as a duplicate. This is more 467 * restrictive than required by the spec. 468 */ 469 if (!ib_response_mad(hdr)) { 470 if (!ib_response_mad(sent_hdr)) 471 return 1; 472 continue; 473 } else if (!ib_response_mad(sent_hdr)) 474 continue; 475 476 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr)) 477 return 1; 478 } 479 480 return 0; 481 } 482 483 static ssize_t ib_umad_write(struct file *filp, const char __user *buf, 484 size_t count, loff_t *pos) 485 { 486 struct ib_umad_file *file = filp->private_data; 487 struct ib_umad_packet *packet; 488 struct ib_mad_agent *agent; 489 struct rdma_ah_attr ah_attr; 490 struct ib_ah *ah; 491 struct ib_rmpp_mad *rmpp_mad; 492 __be64 *tid; 493 int ret, data_len, hdr_len, copy_offset, rmpp_active; 494 u8 base_version; 495 496 if (count < hdr_size(file) + IB_MGMT_RMPP_HDR) 497 return -EINVAL; 498 499 packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL); 500 if (!packet) 501 return -ENOMEM; 502 503 if (copy_from_user(&packet->mad, buf, hdr_size(file))) { 504 ret = -EFAULT; 505 goto err; 506 } 507 508 if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) { 509 ret = -EINVAL; 510 goto err; 511 } 512 513 buf += hdr_size(file); 514 515 if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) { 516 ret = -EFAULT; 517 goto err; 518 } 519 520 mutex_lock(&file->mutex); 521 522 trace_ib_umad_write(file, &packet->mad.hdr, 523 (struct ib_mad_hdr *)&packet->mad.data); 524 525 agent = __get_agent(file, packet->mad.hdr.id); 526 if (!agent) { 527 ret = -EINVAL; 528 goto err_up; 529 } 530 531 memset(&ah_attr, 0, sizeof ah_attr); 532 ah_attr.type = rdma_ah_find_type(agent->device, 533 file->port->port_num); 534 rdma_ah_set_dlid(&ah_attr, be16_to_cpu(packet->mad.hdr.lid)); 535 rdma_ah_set_sl(&ah_attr, packet->mad.hdr.sl); 536 rdma_ah_set_path_bits(&ah_attr, packet->mad.hdr.path_bits); 537 rdma_ah_set_port_num(&ah_attr, file->port->port_num); 538 if (packet->mad.hdr.grh_present) { 539 rdma_ah_set_grh(&ah_attr, NULL, 540 be32_to_cpu(packet->mad.hdr.flow_label), 541 packet->mad.hdr.gid_index, 542 packet->mad.hdr.hop_limit, 543 packet->mad.hdr.traffic_class); 544 rdma_ah_set_dgid_raw(&ah_attr, packet->mad.hdr.gid); 545 } 546 547 ah = rdma_create_user_ah(agent->qp->pd, &ah_attr, NULL); 548 if (IS_ERR(ah)) { 549 ret = PTR_ERR(ah); 550 goto err_up; 551 } 552 553 rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data; 554 hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class); 555 556 if (ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class) 557 && ib_mad_kernel_rmpp_agent(agent)) { 558 copy_offset = IB_MGMT_RMPP_HDR; 559 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 560 IB_MGMT_RMPP_FLAG_ACTIVE; 561 } else { 562 copy_offset = IB_MGMT_MAD_HDR; 563 rmpp_active = 0; 564 } 565 566 base_version = ((struct ib_mad_hdr *)&packet->mad.data)->base_version; 567 data_len = count - hdr_size(file) - hdr_len; 568 packet->msg = ib_create_send_mad(agent, 569 be32_to_cpu(packet->mad.hdr.qpn), 570 packet->mad.hdr.pkey_index, rmpp_active, 571 hdr_len, data_len, GFP_KERNEL, 572 base_version); 573 if (IS_ERR(packet->msg)) { 574 ret = PTR_ERR(packet->msg); 575 goto err_ah; 576 } 577 578 packet->msg->ah = ah; 579 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms; 580 packet->msg->retries = packet->mad.hdr.retries; 581 packet->msg->context[0] = packet; 582 583 /* Copy MAD header. Any RMPP header is already in place. */ 584 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR); 585 586 if (!rmpp_active) { 587 if (copy_from_user(packet->msg->mad + copy_offset, 588 buf + copy_offset, 589 hdr_len + data_len - copy_offset)) { 590 ret = -EFAULT; 591 goto err_msg; 592 } 593 } else { 594 ret = copy_rmpp_mad(packet->msg, buf); 595 if (ret) 596 goto err_msg; 597 } 598 599 /* 600 * Set the high-order part of the transaction ID to make MADs from 601 * different agents unique, and allow routing responses back to the 602 * original requestor. 603 */ 604 if (!ib_response_mad(packet->msg->mad)) { 605 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid; 606 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 | 607 (be64_to_cpup(tid) & 0xffffffff)); 608 rmpp_mad->mad_hdr.tid = *tid; 609 } 610 611 if (!ib_mad_kernel_rmpp_agent(agent) 612 && ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class) 613 && (ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE)) { 614 spin_lock_irq(&file->send_lock); 615 list_add_tail(&packet->list, &file->send_list); 616 spin_unlock_irq(&file->send_lock); 617 } else { 618 spin_lock_irq(&file->send_lock); 619 ret = is_duplicate(file, packet); 620 if (!ret) 621 list_add_tail(&packet->list, &file->send_list); 622 spin_unlock_irq(&file->send_lock); 623 if (ret) { 624 ret = -EINVAL; 625 goto err_msg; 626 } 627 } 628 629 ret = ib_post_send_mad(packet->msg, NULL); 630 if (ret) 631 goto err_send; 632 633 mutex_unlock(&file->mutex); 634 return count; 635 636 err_send: 637 dequeue_send(file, packet); 638 err_msg: 639 ib_free_send_mad(packet->msg); 640 err_ah: 641 rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE); 642 err_up: 643 mutex_unlock(&file->mutex); 644 err: 645 kfree(packet); 646 return ret; 647 } 648 649 static __poll_t ib_umad_poll(struct file *filp, struct poll_table_struct *wait) 650 { 651 struct ib_umad_file *file = filp->private_data; 652 653 /* we will always be able to post a MAD send */ 654 __poll_t mask = EPOLLOUT | EPOLLWRNORM; 655 656 poll_wait(filp, &file->recv_wait, wait); 657 658 if (!list_empty(&file->recv_list)) 659 mask |= EPOLLIN | EPOLLRDNORM; 660 661 return mask; 662 } 663 664 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg, 665 int compat_method_mask) 666 { 667 struct ib_user_mad_reg_req ureq; 668 struct ib_mad_reg_req req; 669 struct ib_mad_agent *agent = NULL; 670 int agent_id; 671 int ret; 672 673 mutex_lock(&file->port->file_mutex); 674 mutex_lock(&file->mutex); 675 676 if (!file->port->ib_dev) { 677 dev_notice(&file->port->dev, 678 "ib_umad_reg_agent: invalid device\n"); 679 ret = -EPIPE; 680 goto out; 681 } 682 683 if (copy_from_user(&ureq, arg, sizeof ureq)) { 684 ret = -EFAULT; 685 goto out; 686 } 687 688 if (ureq.qpn != 0 && ureq.qpn != 1) { 689 dev_notice(&file->port->dev, 690 "ib_umad_reg_agent: invalid QPN %d specified\n", 691 ureq.qpn); 692 ret = -EINVAL; 693 goto out; 694 } 695 696 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id) 697 if (!__get_agent(file, agent_id)) 698 goto found; 699 700 dev_notice(&file->port->dev, 701 "ib_umad_reg_agent: Max Agents (%u) reached\n", 702 IB_UMAD_MAX_AGENTS); 703 ret = -ENOMEM; 704 goto out; 705 706 found: 707 if (ureq.mgmt_class) { 708 memset(&req, 0, sizeof(req)); 709 req.mgmt_class = ureq.mgmt_class; 710 req.mgmt_class_version = ureq.mgmt_class_version; 711 memcpy(req.oui, ureq.oui, sizeof req.oui); 712 713 if (compat_method_mask) { 714 u32 *umm = (u32 *) ureq.method_mask; 715 int i; 716 717 for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i) 718 req.method_mask[i] = 719 umm[i * 2] | ((u64) umm[i * 2 + 1] << 32); 720 } else 721 memcpy(req.method_mask, ureq.method_mask, 722 sizeof req.method_mask); 723 } 724 725 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num, 726 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI, 727 ureq.mgmt_class ? &req : NULL, 728 ureq.rmpp_version, 729 send_handler, recv_handler, file, 0); 730 if (IS_ERR(agent)) { 731 ret = PTR_ERR(agent); 732 agent = NULL; 733 goto out; 734 } 735 736 if (put_user(agent_id, 737 (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) { 738 ret = -EFAULT; 739 goto out; 740 } 741 742 if (!file->already_used) { 743 file->already_used = 1; 744 if (!file->use_pkey_index) { 745 dev_warn(&file->port->dev, 746 "process %s did not enable P_Key index support.\n", 747 current->comm); 748 dev_warn(&file->port->dev, 749 " Documentation/infiniband/user_mad.rst has info on the new ABI.\n"); 750 } 751 } 752 753 file->agent[agent_id] = agent; 754 ret = 0; 755 756 out: 757 mutex_unlock(&file->mutex); 758 759 if (ret && agent) 760 ib_unregister_mad_agent(agent); 761 762 mutex_unlock(&file->port->file_mutex); 763 764 return ret; 765 } 766 767 static int ib_umad_reg_agent2(struct ib_umad_file *file, void __user *arg) 768 { 769 struct ib_user_mad_reg_req2 ureq; 770 struct ib_mad_reg_req req; 771 struct ib_mad_agent *agent = NULL; 772 int agent_id; 773 int ret; 774 775 mutex_lock(&file->port->file_mutex); 776 mutex_lock(&file->mutex); 777 778 if (!file->port->ib_dev) { 779 dev_notice(&file->port->dev, 780 "ib_umad_reg_agent2: invalid device\n"); 781 ret = -EPIPE; 782 goto out; 783 } 784 785 if (copy_from_user(&ureq, arg, sizeof(ureq))) { 786 ret = -EFAULT; 787 goto out; 788 } 789 790 if (ureq.qpn != 0 && ureq.qpn != 1) { 791 dev_notice(&file->port->dev, 792 "ib_umad_reg_agent2: invalid QPN %d specified\n", 793 ureq.qpn); 794 ret = -EINVAL; 795 goto out; 796 } 797 798 if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) { 799 dev_notice(&file->port->dev, 800 "ib_umad_reg_agent2 failed: invalid registration flags specified 0x%x; supported 0x%x\n", 801 ureq.flags, IB_USER_MAD_REG_FLAGS_CAP); 802 ret = -EINVAL; 803 804 if (put_user((u32)IB_USER_MAD_REG_FLAGS_CAP, 805 (u32 __user *) (arg + offsetof(struct 806 ib_user_mad_reg_req2, flags)))) 807 ret = -EFAULT; 808 809 goto out; 810 } 811 812 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id) 813 if (!__get_agent(file, agent_id)) 814 goto found; 815 816 dev_notice(&file->port->dev, 817 "ib_umad_reg_agent2: Max Agents (%u) reached\n", 818 IB_UMAD_MAX_AGENTS); 819 ret = -ENOMEM; 820 goto out; 821 822 found: 823 if (ureq.mgmt_class) { 824 memset(&req, 0, sizeof(req)); 825 req.mgmt_class = ureq.mgmt_class; 826 req.mgmt_class_version = ureq.mgmt_class_version; 827 if (ureq.oui & 0xff000000) { 828 dev_notice(&file->port->dev, 829 "ib_umad_reg_agent2 failed: oui invalid 0x%08x\n", 830 ureq.oui); 831 ret = -EINVAL; 832 goto out; 833 } 834 req.oui[2] = ureq.oui & 0x0000ff; 835 req.oui[1] = (ureq.oui & 0x00ff00) >> 8; 836 req.oui[0] = (ureq.oui & 0xff0000) >> 16; 837 memcpy(req.method_mask, ureq.method_mask, 838 sizeof(req.method_mask)); 839 } 840 841 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num, 842 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI, 843 ureq.mgmt_class ? &req : NULL, 844 ureq.rmpp_version, 845 send_handler, recv_handler, file, 846 ureq.flags); 847 if (IS_ERR(agent)) { 848 ret = PTR_ERR(agent); 849 agent = NULL; 850 goto out; 851 } 852 853 if (put_user(agent_id, 854 (u32 __user *)(arg + 855 offsetof(struct ib_user_mad_reg_req2, id)))) { 856 ret = -EFAULT; 857 goto out; 858 } 859 860 if (!file->already_used) { 861 file->already_used = 1; 862 file->use_pkey_index = 1; 863 } 864 865 file->agent[agent_id] = agent; 866 ret = 0; 867 868 out: 869 mutex_unlock(&file->mutex); 870 871 if (ret && agent) 872 ib_unregister_mad_agent(agent); 873 874 mutex_unlock(&file->port->file_mutex); 875 876 return ret; 877 } 878 879 880 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg) 881 { 882 struct ib_mad_agent *agent = NULL; 883 u32 id; 884 int ret = 0; 885 886 if (get_user(id, arg)) 887 return -EFAULT; 888 if (id >= IB_UMAD_MAX_AGENTS) 889 return -EINVAL; 890 891 mutex_lock(&file->port->file_mutex); 892 mutex_lock(&file->mutex); 893 894 id = array_index_nospec(id, IB_UMAD_MAX_AGENTS); 895 if (!__get_agent(file, id)) { 896 ret = -EINVAL; 897 goto out; 898 } 899 900 agent = file->agent[id]; 901 file->agent[id] = NULL; 902 903 out: 904 mutex_unlock(&file->mutex); 905 906 if (agent) 907 ib_unregister_mad_agent(agent); 908 909 mutex_unlock(&file->port->file_mutex); 910 911 return ret; 912 } 913 914 static long ib_umad_enable_pkey(struct ib_umad_file *file) 915 { 916 int ret = 0; 917 918 mutex_lock(&file->mutex); 919 if (file->already_used) 920 ret = -EINVAL; 921 else 922 file->use_pkey_index = 1; 923 mutex_unlock(&file->mutex); 924 925 return ret; 926 } 927 928 static long ib_umad_ioctl(struct file *filp, unsigned int cmd, 929 unsigned long arg) 930 { 931 switch (cmd) { 932 case IB_USER_MAD_REGISTER_AGENT: 933 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0); 934 case IB_USER_MAD_UNREGISTER_AGENT: 935 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg); 936 case IB_USER_MAD_ENABLE_PKEY: 937 return ib_umad_enable_pkey(filp->private_data); 938 case IB_USER_MAD_REGISTER_AGENT2: 939 return ib_umad_reg_agent2(filp->private_data, (void __user *) arg); 940 default: 941 return -ENOIOCTLCMD; 942 } 943 } 944 945 #ifdef CONFIG_COMPAT 946 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd, 947 unsigned long arg) 948 { 949 switch (cmd) { 950 case IB_USER_MAD_REGISTER_AGENT: 951 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1); 952 case IB_USER_MAD_UNREGISTER_AGENT: 953 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg)); 954 case IB_USER_MAD_ENABLE_PKEY: 955 return ib_umad_enable_pkey(filp->private_data); 956 case IB_USER_MAD_REGISTER_AGENT2: 957 return ib_umad_reg_agent2(filp->private_data, compat_ptr(arg)); 958 default: 959 return -ENOIOCTLCMD; 960 } 961 } 962 #endif 963 964 /* 965 * ib_umad_open() does not need the BKL: 966 * 967 * - the ib_umad_port structures are properly reference counted, and 968 * everything else is purely local to the file being created, so 969 * races against other open calls are not a problem; 970 * - the ioctl method does not affect any global state outside of the 971 * file structure being operated on; 972 */ 973 static int ib_umad_open(struct inode *inode, struct file *filp) 974 { 975 struct ib_umad_port *port; 976 struct ib_umad_file *file; 977 int ret = 0; 978 979 port = container_of(inode->i_cdev, struct ib_umad_port, cdev); 980 981 mutex_lock(&port->file_mutex); 982 983 if (!port->ib_dev) { 984 ret = -ENXIO; 985 goto out; 986 } 987 988 if (!rdma_dev_access_netns(port->ib_dev, current->nsproxy->net_ns)) { 989 ret = -EPERM; 990 goto out; 991 } 992 993 file = kzalloc(sizeof(*file), GFP_KERNEL); 994 if (!file) { 995 ret = -ENOMEM; 996 goto out; 997 } 998 999 mutex_init(&file->mutex); 1000 spin_lock_init(&file->send_lock); 1001 INIT_LIST_HEAD(&file->recv_list); 1002 INIT_LIST_HEAD(&file->send_list); 1003 init_waitqueue_head(&file->recv_wait); 1004 1005 file->port = port; 1006 filp->private_data = file; 1007 1008 list_add_tail(&file->port_list, &port->file_list); 1009 1010 stream_open(inode, filp); 1011 out: 1012 mutex_unlock(&port->file_mutex); 1013 return ret; 1014 } 1015 1016 static int ib_umad_close(struct inode *inode, struct file *filp) 1017 { 1018 struct ib_umad_file *file = filp->private_data; 1019 struct ib_umad_packet *packet, *tmp; 1020 int already_dead; 1021 int i; 1022 1023 mutex_lock(&file->port->file_mutex); 1024 mutex_lock(&file->mutex); 1025 1026 already_dead = file->agents_dead; 1027 file->agents_dead = 1; 1028 1029 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) { 1030 if (packet->recv_wc) 1031 ib_free_recv_mad(packet->recv_wc); 1032 kfree(packet); 1033 } 1034 1035 list_del(&file->port_list); 1036 1037 mutex_unlock(&file->mutex); 1038 1039 if (!already_dead) 1040 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i) 1041 if (file->agent[i]) 1042 ib_unregister_mad_agent(file->agent[i]); 1043 1044 mutex_unlock(&file->port->file_mutex); 1045 mutex_destroy(&file->mutex); 1046 kfree(file); 1047 return 0; 1048 } 1049 1050 static const struct file_operations umad_fops = { 1051 .owner = THIS_MODULE, 1052 .read = ib_umad_read, 1053 .write = ib_umad_write, 1054 .poll = ib_umad_poll, 1055 .unlocked_ioctl = ib_umad_ioctl, 1056 #ifdef CONFIG_COMPAT 1057 .compat_ioctl = ib_umad_compat_ioctl, 1058 #endif 1059 .open = ib_umad_open, 1060 .release = ib_umad_close, 1061 .llseek = no_llseek, 1062 }; 1063 1064 static int ib_umad_sm_open(struct inode *inode, struct file *filp) 1065 { 1066 struct ib_umad_port *port; 1067 struct ib_port_modify props = { 1068 .set_port_cap_mask = IB_PORT_SM 1069 }; 1070 int ret; 1071 1072 port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev); 1073 1074 if (filp->f_flags & O_NONBLOCK) { 1075 if (down_trylock(&port->sm_sem)) { 1076 ret = -EAGAIN; 1077 goto fail; 1078 } 1079 } else { 1080 if (down_interruptible(&port->sm_sem)) { 1081 ret = -ERESTARTSYS; 1082 goto fail; 1083 } 1084 } 1085 1086 if (!rdma_dev_access_netns(port->ib_dev, current->nsproxy->net_ns)) { 1087 ret = -EPERM; 1088 goto err_up_sem; 1089 } 1090 1091 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props); 1092 if (ret) 1093 goto err_up_sem; 1094 1095 filp->private_data = port; 1096 1097 nonseekable_open(inode, filp); 1098 return 0; 1099 1100 err_up_sem: 1101 up(&port->sm_sem); 1102 1103 fail: 1104 return ret; 1105 } 1106 1107 static int ib_umad_sm_close(struct inode *inode, struct file *filp) 1108 { 1109 struct ib_umad_port *port = filp->private_data; 1110 struct ib_port_modify props = { 1111 .clr_port_cap_mask = IB_PORT_SM 1112 }; 1113 int ret = 0; 1114 1115 mutex_lock(&port->file_mutex); 1116 if (port->ib_dev) 1117 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props); 1118 mutex_unlock(&port->file_mutex); 1119 1120 up(&port->sm_sem); 1121 1122 return ret; 1123 } 1124 1125 static const struct file_operations umad_sm_fops = { 1126 .owner = THIS_MODULE, 1127 .open = ib_umad_sm_open, 1128 .release = ib_umad_sm_close, 1129 .llseek = no_llseek, 1130 }; 1131 1132 static struct ib_umad_port *get_port(struct ib_device *ibdev, 1133 struct ib_umad_device *umad_dev, 1134 unsigned int port) 1135 { 1136 if (!umad_dev) 1137 return ERR_PTR(-EOPNOTSUPP); 1138 if (!rdma_is_port_valid(ibdev, port)) 1139 return ERR_PTR(-EINVAL); 1140 if (!rdma_cap_ib_mad(ibdev, port)) 1141 return ERR_PTR(-EOPNOTSUPP); 1142 1143 return &umad_dev->ports[port - rdma_start_port(ibdev)]; 1144 } 1145 1146 static int ib_umad_get_nl_info(struct ib_device *ibdev, void *client_data, 1147 struct ib_client_nl_info *res) 1148 { 1149 struct ib_umad_port *port = get_port(ibdev, client_data, res->port); 1150 1151 if (IS_ERR(port)) 1152 return PTR_ERR(port); 1153 1154 res->abi = IB_USER_MAD_ABI_VERSION; 1155 res->cdev = &port->dev; 1156 return 0; 1157 } 1158 1159 static struct ib_client umad_client = { 1160 .name = "umad", 1161 .add = ib_umad_add_one, 1162 .remove = ib_umad_remove_one, 1163 .get_nl_info = ib_umad_get_nl_info, 1164 }; 1165 MODULE_ALIAS_RDMA_CLIENT("umad"); 1166 1167 static int ib_issm_get_nl_info(struct ib_device *ibdev, void *client_data, 1168 struct ib_client_nl_info *res) 1169 { 1170 struct ib_umad_port *port = get_port(ibdev, client_data, res->port); 1171 1172 if (IS_ERR(port)) 1173 return PTR_ERR(port); 1174 1175 res->abi = IB_USER_MAD_ABI_VERSION; 1176 res->cdev = &port->sm_dev; 1177 return 0; 1178 } 1179 1180 static struct ib_client issm_client = { 1181 .name = "issm", 1182 .get_nl_info = ib_issm_get_nl_info, 1183 }; 1184 MODULE_ALIAS_RDMA_CLIENT("issm"); 1185 1186 static ssize_t ibdev_show(struct device *dev, struct device_attribute *attr, 1187 char *buf) 1188 { 1189 struct ib_umad_port *port = dev_get_drvdata(dev); 1190 1191 if (!port) 1192 return -ENODEV; 1193 1194 return sprintf(buf, "%s\n", dev_name(&port->ib_dev->dev)); 1195 } 1196 static DEVICE_ATTR_RO(ibdev); 1197 1198 static ssize_t port_show(struct device *dev, struct device_attribute *attr, 1199 char *buf) 1200 { 1201 struct ib_umad_port *port = dev_get_drvdata(dev); 1202 1203 if (!port) 1204 return -ENODEV; 1205 1206 return sprintf(buf, "%d\n", port->port_num); 1207 } 1208 static DEVICE_ATTR_RO(port); 1209 1210 static struct attribute *umad_class_dev_attrs[] = { 1211 &dev_attr_ibdev.attr, 1212 &dev_attr_port.attr, 1213 NULL, 1214 }; 1215 ATTRIBUTE_GROUPS(umad_class_dev); 1216 1217 static char *umad_devnode(struct device *dev, umode_t *mode) 1218 { 1219 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 1220 } 1221 1222 static ssize_t abi_version_show(struct class *class, 1223 struct class_attribute *attr, char *buf) 1224 { 1225 return sprintf(buf, "%d\n", IB_USER_MAD_ABI_VERSION); 1226 } 1227 static CLASS_ATTR_RO(abi_version); 1228 1229 static struct attribute *umad_class_attrs[] = { 1230 &class_attr_abi_version.attr, 1231 NULL, 1232 }; 1233 ATTRIBUTE_GROUPS(umad_class); 1234 1235 static struct class umad_class = { 1236 .name = "infiniband_mad", 1237 .devnode = umad_devnode, 1238 .class_groups = umad_class_groups, 1239 .dev_groups = umad_class_dev_groups, 1240 }; 1241 1242 static void ib_umad_release_port(struct device *device) 1243 { 1244 struct ib_umad_port *port = dev_get_drvdata(device); 1245 struct ib_umad_device *umad_dev = port->umad_dev; 1246 1247 ib_umad_dev_put(umad_dev); 1248 } 1249 1250 static void ib_umad_init_port_dev(struct device *dev, 1251 struct ib_umad_port *port, 1252 const struct ib_device *device) 1253 { 1254 device_initialize(dev); 1255 ib_umad_dev_get(port->umad_dev); 1256 dev->class = &umad_class; 1257 dev->parent = device->dev.parent; 1258 dev_set_drvdata(dev, port); 1259 dev->release = ib_umad_release_port; 1260 } 1261 1262 static int ib_umad_init_port(struct ib_device *device, int port_num, 1263 struct ib_umad_device *umad_dev, 1264 struct ib_umad_port *port) 1265 { 1266 int devnum; 1267 dev_t base_umad; 1268 dev_t base_issm; 1269 int ret; 1270 1271 devnum = ida_alloc_max(&umad_ida, IB_UMAD_MAX_PORTS - 1, GFP_KERNEL); 1272 if (devnum < 0) 1273 return -1; 1274 port->dev_num = devnum; 1275 if (devnum >= IB_UMAD_NUM_FIXED_MINOR) { 1276 base_umad = dynamic_umad_dev + devnum - IB_UMAD_NUM_FIXED_MINOR; 1277 base_issm = dynamic_issm_dev + devnum - IB_UMAD_NUM_FIXED_MINOR; 1278 } else { 1279 base_umad = devnum + base_umad_dev; 1280 base_issm = devnum + base_issm_dev; 1281 } 1282 1283 port->ib_dev = device; 1284 port->umad_dev = umad_dev; 1285 port->port_num = port_num; 1286 sema_init(&port->sm_sem, 1); 1287 mutex_init(&port->file_mutex); 1288 INIT_LIST_HEAD(&port->file_list); 1289 1290 ib_umad_init_port_dev(&port->dev, port, device); 1291 port->dev.devt = base_umad; 1292 dev_set_name(&port->dev, "umad%d", port->dev_num); 1293 cdev_init(&port->cdev, &umad_fops); 1294 port->cdev.owner = THIS_MODULE; 1295 1296 ret = cdev_device_add(&port->cdev, &port->dev); 1297 if (ret) 1298 goto err_cdev; 1299 1300 ib_umad_init_port_dev(&port->sm_dev, port, device); 1301 port->sm_dev.devt = base_issm; 1302 dev_set_name(&port->sm_dev, "issm%d", port->dev_num); 1303 cdev_init(&port->sm_cdev, &umad_sm_fops); 1304 port->sm_cdev.owner = THIS_MODULE; 1305 1306 ret = cdev_device_add(&port->sm_cdev, &port->sm_dev); 1307 if (ret) 1308 goto err_dev; 1309 1310 return 0; 1311 1312 err_dev: 1313 put_device(&port->sm_dev); 1314 cdev_device_del(&port->cdev, &port->dev); 1315 err_cdev: 1316 put_device(&port->dev); 1317 ida_free(&umad_ida, devnum); 1318 return ret; 1319 } 1320 1321 static void ib_umad_kill_port(struct ib_umad_port *port) 1322 { 1323 struct ib_umad_file *file; 1324 int id; 1325 1326 cdev_device_del(&port->sm_cdev, &port->sm_dev); 1327 cdev_device_del(&port->cdev, &port->dev); 1328 1329 mutex_lock(&port->file_mutex); 1330 1331 /* Mark ib_dev NULL and block ioctl or other file ops to progress 1332 * further. 1333 */ 1334 port->ib_dev = NULL; 1335 1336 list_for_each_entry(file, &port->file_list, port_list) { 1337 mutex_lock(&file->mutex); 1338 file->agents_dead = 1; 1339 mutex_unlock(&file->mutex); 1340 1341 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id) 1342 if (file->agent[id]) 1343 ib_unregister_mad_agent(file->agent[id]); 1344 } 1345 1346 mutex_unlock(&port->file_mutex); 1347 1348 ida_free(&umad_ida, port->dev_num); 1349 1350 /* balances device_initialize() */ 1351 put_device(&port->sm_dev); 1352 put_device(&port->dev); 1353 } 1354 1355 static int ib_umad_add_one(struct ib_device *device) 1356 { 1357 struct ib_umad_device *umad_dev; 1358 int s, e, i; 1359 int count = 0; 1360 int ret; 1361 1362 s = rdma_start_port(device); 1363 e = rdma_end_port(device); 1364 1365 umad_dev = kzalloc(struct_size(umad_dev, ports, e - s + 1), GFP_KERNEL); 1366 if (!umad_dev) 1367 return -ENOMEM; 1368 1369 kref_init(&umad_dev->kref); 1370 for (i = s; i <= e; ++i) { 1371 if (!rdma_cap_ib_mad(device, i)) 1372 continue; 1373 1374 ret = ib_umad_init_port(device, i, umad_dev, 1375 &umad_dev->ports[i - s]); 1376 if (ret) 1377 goto err; 1378 1379 count++; 1380 } 1381 1382 if (!count) { 1383 ret = -EOPNOTSUPP; 1384 goto free; 1385 } 1386 1387 ib_set_client_data(device, &umad_client, umad_dev); 1388 1389 return 0; 1390 1391 err: 1392 while (--i >= s) { 1393 if (!rdma_cap_ib_mad(device, i)) 1394 continue; 1395 1396 ib_umad_kill_port(&umad_dev->ports[i - s]); 1397 } 1398 free: 1399 /* balances kref_init */ 1400 ib_umad_dev_put(umad_dev); 1401 return ret; 1402 } 1403 1404 static void ib_umad_remove_one(struct ib_device *device, void *client_data) 1405 { 1406 struct ib_umad_device *umad_dev = client_data; 1407 unsigned int i; 1408 1409 rdma_for_each_port (device, i) { 1410 if (rdma_cap_ib_mad(device, i)) 1411 ib_umad_kill_port( 1412 &umad_dev->ports[i - rdma_start_port(device)]); 1413 } 1414 /* balances kref_init() */ 1415 ib_umad_dev_put(umad_dev); 1416 } 1417 1418 static int __init ib_umad_init(void) 1419 { 1420 int ret; 1421 1422 ret = register_chrdev_region(base_umad_dev, 1423 IB_UMAD_NUM_FIXED_MINOR * 2, 1424 umad_class.name); 1425 if (ret) { 1426 pr_err("couldn't register device number\n"); 1427 goto out; 1428 } 1429 1430 ret = alloc_chrdev_region(&dynamic_umad_dev, 0, 1431 IB_UMAD_NUM_DYNAMIC_MINOR * 2, 1432 umad_class.name); 1433 if (ret) { 1434 pr_err("couldn't register dynamic device number\n"); 1435 goto out_alloc; 1436 } 1437 dynamic_issm_dev = dynamic_umad_dev + IB_UMAD_NUM_DYNAMIC_MINOR; 1438 1439 ret = class_register(&umad_class); 1440 if (ret) { 1441 pr_err("couldn't create class infiniband_mad\n"); 1442 goto out_chrdev; 1443 } 1444 1445 ret = ib_register_client(&umad_client); 1446 if (ret) 1447 goto out_class; 1448 1449 ret = ib_register_client(&issm_client); 1450 if (ret) 1451 goto out_client; 1452 1453 return 0; 1454 1455 out_client: 1456 ib_unregister_client(&umad_client); 1457 out_class: 1458 class_unregister(&umad_class); 1459 1460 out_chrdev: 1461 unregister_chrdev_region(dynamic_umad_dev, 1462 IB_UMAD_NUM_DYNAMIC_MINOR * 2); 1463 1464 out_alloc: 1465 unregister_chrdev_region(base_umad_dev, 1466 IB_UMAD_NUM_FIXED_MINOR * 2); 1467 1468 out: 1469 return ret; 1470 } 1471 1472 static void __exit ib_umad_cleanup(void) 1473 { 1474 ib_unregister_client(&issm_client); 1475 ib_unregister_client(&umad_client); 1476 class_unregister(&umad_class); 1477 unregister_chrdev_region(base_umad_dev, 1478 IB_UMAD_NUM_FIXED_MINOR * 2); 1479 unregister_chrdev_region(dynamic_umad_dev, 1480 IB_UMAD_NUM_DYNAMIC_MINOR * 2); 1481 } 1482 1483 module_init(ib_umad_init); 1484 module_exit(ib_umad_cleanup); 1485