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 u32 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 struct ib_rmpp_mad_hdr { 135 struct ib_mad_hdr mad_hdr; 136 struct ib_rmpp_hdr rmpp_hdr; 137 } __packed; 138 139 #define CREATE_TRACE_POINTS 140 #include <trace/events/ib_umad.h> 141 142 static const dev_t base_umad_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE); 143 static const dev_t base_issm_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE) + 144 IB_UMAD_NUM_FIXED_MINOR; 145 static dev_t dynamic_umad_dev; 146 static dev_t dynamic_issm_dev; 147 148 static DEFINE_IDA(umad_ida); 149 150 static int ib_umad_add_one(struct ib_device *device); 151 static void ib_umad_remove_one(struct ib_device *device, void *client_data); 152 153 static void ib_umad_dev_free(struct kref *kref) 154 { 155 struct ib_umad_device *dev = 156 container_of(kref, struct ib_umad_device, kref); 157 158 kfree(dev); 159 } 160 161 static void ib_umad_dev_get(struct ib_umad_device *dev) 162 { 163 kref_get(&dev->kref); 164 } 165 166 static void ib_umad_dev_put(struct ib_umad_device *dev) 167 { 168 kref_put(&dev->kref, ib_umad_dev_free); 169 } 170 171 static int hdr_size(struct ib_umad_file *file) 172 { 173 return file->use_pkey_index ? sizeof(struct ib_user_mad_hdr) : 174 sizeof(struct ib_user_mad_hdr_old); 175 } 176 177 /* caller must hold file->mutex */ 178 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id) 179 { 180 return file->agents_dead ? NULL : file->agent[id]; 181 } 182 183 static int queue_packet(struct ib_umad_file *file, 184 struct ib_mad_agent *agent, 185 struct ib_umad_packet *packet) 186 { 187 int ret = 1; 188 189 mutex_lock(&file->mutex); 190 191 for (packet->mad.hdr.id = 0; 192 packet->mad.hdr.id < IB_UMAD_MAX_AGENTS; 193 packet->mad.hdr.id++) 194 if (agent == __get_agent(file, packet->mad.hdr.id)) { 195 list_add_tail(&packet->list, &file->recv_list); 196 wake_up_interruptible(&file->recv_wait); 197 ret = 0; 198 break; 199 } 200 201 mutex_unlock(&file->mutex); 202 203 return ret; 204 } 205 206 static void dequeue_send(struct ib_umad_file *file, 207 struct ib_umad_packet *packet) 208 { 209 spin_lock_irq(&file->send_lock); 210 list_del(&packet->list); 211 spin_unlock_irq(&file->send_lock); 212 } 213 214 static void send_handler(struct ib_mad_agent *agent, 215 struct ib_mad_send_wc *send_wc) 216 { 217 struct ib_umad_file *file = agent->context; 218 struct ib_umad_packet *packet = send_wc->send_buf->context[0]; 219 220 dequeue_send(file, packet); 221 rdma_destroy_ah(packet->msg->ah, RDMA_DESTROY_AH_SLEEPABLE); 222 ib_free_send_mad(packet->msg); 223 224 if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) { 225 packet->length = IB_MGMT_MAD_HDR; 226 packet->mad.hdr.status = ETIMEDOUT; 227 if (!queue_packet(file, agent, packet)) 228 return; 229 } 230 kfree(packet); 231 } 232 233 static void recv_handler(struct ib_mad_agent *agent, 234 struct ib_mad_send_buf *send_buf, 235 struct ib_mad_recv_wc *mad_recv_wc) 236 { 237 struct ib_umad_file *file = agent->context; 238 struct ib_umad_packet *packet; 239 240 if (mad_recv_wc->wc->status != IB_WC_SUCCESS) 241 goto err1; 242 243 packet = kzalloc(sizeof *packet, GFP_KERNEL); 244 if (!packet) 245 goto err1; 246 247 packet->length = mad_recv_wc->mad_len; 248 packet->recv_wc = mad_recv_wc; 249 250 packet->mad.hdr.status = 0; 251 packet->mad.hdr.length = hdr_size(file) + mad_recv_wc->mad_len; 252 packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp); 253 /* 254 * On OPA devices it is okay to lose the upper 16 bits of LID as this 255 * information is obtained elsewhere. Mask off the upper 16 bits. 256 */ 257 if (rdma_cap_opa_mad(agent->device, agent->port_num)) 258 packet->mad.hdr.lid = ib_lid_be16(0xFFFF & 259 mad_recv_wc->wc->slid); 260 else 261 packet->mad.hdr.lid = ib_lid_be16(mad_recv_wc->wc->slid); 262 packet->mad.hdr.sl = mad_recv_wc->wc->sl; 263 packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits; 264 packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index; 265 packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH); 266 if (packet->mad.hdr.grh_present) { 267 struct rdma_ah_attr ah_attr; 268 const struct ib_global_route *grh; 269 int ret; 270 271 ret = ib_init_ah_attr_from_wc(agent->device, agent->port_num, 272 mad_recv_wc->wc, 273 mad_recv_wc->recv_buf.grh, 274 &ah_attr); 275 if (ret) 276 goto err2; 277 278 grh = rdma_ah_read_grh(&ah_attr); 279 packet->mad.hdr.gid_index = grh->sgid_index; 280 packet->mad.hdr.hop_limit = grh->hop_limit; 281 packet->mad.hdr.traffic_class = grh->traffic_class; 282 memcpy(packet->mad.hdr.gid, &grh->dgid, 16); 283 packet->mad.hdr.flow_label = cpu_to_be32(grh->flow_label); 284 rdma_destroy_ah_attr(&ah_attr); 285 } 286 287 if (queue_packet(file, agent, packet)) 288 goto err2; 289 return; 290 291 err2: 292 kfree(packet); 293 err1: 294 ib_free_recv_mad(mad_recv_wc); 295 } 296 297 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf, 298 struct ib_umad_packet *packet, size_t count) 299 { 300 struct ib_mad_recv_buf *recv_buf; 301 int left, seg_payload, offset, max_seg_payload; 302 size_t seg_size; 303 304 recv_buf = &packet->recv_wc->recv_buf; 305 seg_size = packet->recv_wc->mad_seg_size; 306 307 /* We need enough room to copy the first (or only) MAD segment. */ 308 if ((packet->length <= seg_size && 309 count < hdr_size(file) + packet->length) || 310 (packet->length > seg_size && 311 count < hdr_size(file) + seg_size)) 312 return -EINVAL; 313 314 if (copy_to_user(buf, &packet->mad, hdr_size(file))) 315 return -EFAULT; 316 317 buf += hdr_size(file); 318 seg_payload = min_t(int, packet->length, seg_size); 319 if (copy_to_user(buf, recv_buf->mad, seg_payload)) 320 return -EFAULT; 321 322 if (seg_payload < packet->length) { 323 /* 324 * Multipacket RMPP MAD message. Copy remainder of message. 325 * Note that last segment may have a shorter payload. 326 */ 327 if (count < hdr_size(file) + packet->length) { 328 /* 329 * The buffer is too small, return the first RMPP segment, 330 * which includes the RMPP message length. 331 */ 332 return -ENOSPC; 333 } 334 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class); 335 max_seg_payload = seg_size - offset; 336 337 for (left = packet->length - seg_payload, buf += seg_payload; 338 left; left -= seg_payload, buf += seg_payload) { 339 recv_buf = container_of(recv_buf->list.next, 340 struct ib_mad_recv_buf, list); 341 seg_payload = min(left, max_seg_payload); 342 if (copy_to_user(buf, ((void *) recv_buf->mad) + offset, 343 seg_payload)) 344 return -EFAULT; 345 } 346 } 347 348 trace_ib_umad_read_recv(file, &packet->mad.hdr, &recv_buf->mad->mad_hdr); 349 350 return hdr_size(file) + packet->length; 351 } 352 353 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf, 354 struct ib_umad_packet *packet, size_t count) 355 { 356 ssize_t size = hdr_size(file) + packet->length; 357 358 if (count < size) 359 return -EINVAL; 360 361 if (copy_to_user(buf, &packet->mad, hdr_size(file))) 362 return -EFAULT; 363 364 buf += hdr_size(file); 365 366 if (copy_to_user(buf, packet->mad.data, packet->length)) 367 return -EFAULT; 368 369 trace_ib_umad_read_send(file, &packet->mad.hdr, 370 (struct ib_mad_hdr *)&packet->mad.data); 371 372 return size; 373 } 374 375 static ssize_t ib_umad_read(struct file *filp, char __user *buf, 376 size_t count, loff_t *pos) 377 { 378 struct ib_umad_file *file = filp->private_data; 379 struct ib_umad_packet *packet; 380 ssize_t ret; 381 382 if (count < hdr_size(file)) 383 return -EINVAL; 384 385 mutex_lock(&file->mutex); 386 387 if (file->agents_dead) { 388 mutex_unlock(&file->mutex); 389 return -EIO; 390 } 391 392 while (list_empty(&file->recv_list)) { 393 mutex_unlock(&file->mutex); 394 395 if (filp->f_flags & O_NONBLOCK) 396 return -EAGAIN; 397 398 if (wait_event_interruptible(file->recv_wait, 399 !list_empty(&file->recv_list))) 400 return -ERESTARTSYS; 401 402 mutex_lock(&file->mutex); 403 } 404 405 if (file->agents_dead) { 406 mutex_unlock(&file->mutex); 407 return -EIO; 408 } 409 410 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list); 411 list_del(&packet->list); 412 413 mutex_unlock(&file->mutex); 414 415 if (packet->recv_wc) 416 ret = copy_recv_mad(file, buf, packet, count); 417 else 418 ret = copy_send_mad(file, buf, packet, count); 419 420 if (ret < 0) { 421 /* Requeue packet */ 422 mutex_lock(&file->mutex); 423 list_add(&packet->list, &file->recv_list); 424 mutex_unlock(&file->mutex); 425 } else { 426 if (packet->recv_wc) 427 ib_free_recv_mad(packet->recv_wc); 428 kfree(packet); 429 } 430 return ret; 431 } 432 433 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf) 434 { 435 int left, seg; 436 437 /* Copy class specific header */ 438 if ((msg->hdr_len > IB_MGMT_RMPP_HDR) && 439 copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR, 440 msg->hdr_len - IB_MGMT_RMPP_HDR)) 441 return -EFAULT; 442 443 /* All headers are in place. Copy data segments. */ 444 for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0; 445 seg++, left -= msg->seg_size, buf += msg->seg_size) { 446 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf, 447 min(left, msg->seg_size))) 448 return -EFAULT; 449 } 450 return 0; 451 } 452 453 static int same_destination(struct ib_user_mad_hdr *hdr1, 454 struct ib_user_mad_hdr *hdr2) 455 { 456 if (!hdr1->grh_present && !hdr2->grh_present) 457 return (hdr1->lid == hdr2->lid); 458 459 if (hdr1->grh_present && hdr2->grh_present) 460 return !memcmp(hdr1->gid, hdr2->gid, 16); 461 462 return 0; 463 } 464 465 static int is_duplicate(struct ib_umad_file *file, 466 struct ib_umad_packet *packet) 467 { 468 struct ib_umad_packet *sent_packet; 469 struct ib_mad_hdr *sent_hdr, *hdr; 470 471 hdr = (struct ib_mad_hdr *) packet->mad.data; 472 list_for_each_entry(sent_packet, &file->send_list, list) { 473 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data; 474 475 if ((hdr->tid != sent_hdr->tid) || 476 (hdr->mgmt_class != sent_hdr->mgmt_class)) 477 continue; 478 479 /* 480 * No need to be overly clever here. If two new operations have 481 * the same TID, reject the second as a duplicate. This is more 482 * restrictive than required by the spec. 483 */ 484 if (!ib_response_mad(hdr)) { 485 if (!ib_response_mad(sent_hdr)) 486 return 1; 487 continue; 488 } else if (!ib_response_mad(sent_hdr)) 489 continue; 490 491 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr)) 492 return 1; 493 } 494 495 return 0; 496 } 497 498 static ssize_t ib_umad_write(struct file *filp, const char __user *buf, 499 size_t count, loff_t *pos) 500 { 501 struct ib_umad_file *file = filp->private_data; 502 struct ib_rmpp_mad_hdr *rmpp_mad_hdr; 503 struct ib_umad_packet *packet; 504 struct ib_mad_agent *agent; 505 struct rdma_ah_attr ah_attr; 506 struct ib_ah *ah; 507 __be64 *tid; 508 int ret, data_len, hdr_len, copy_offset, rmpp_active; 509 u8 base_version; 510 511 if (count < hdr_size(file) + IB_MGMT_RMPP_HDR) 512 return -EINVAL; 513 514 packet = kzalloc(sizeof(*packet) + IB_MGMT_RMPP_HDR, GFP_KERNEL); 515 if (!packet) 516 return -ENOMEM; 517 518 if (copy_from_user(&packet->mad, buf, hdr_size(file))) { 519 ret = -EFAULT; 520 goto err; 521 } 522 523 if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) { 524 ret = -EINVAL; 525 goto err; 526 } 527 528 buf += hdr_size(file); 529 530 if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) { 531 ret = -EFAULT; 532 goto err; 533 } 534 535 mutex_lock(&file->mutex); 536 537 trace_ib_umad_write(file, &packet->mad.hdr, 538 (struct ib_mad_hdr *)&packet->mad.data); 539 540 agent = __get_agent(file, packet->mad.hdr.id); 541 if (!agent) { 542 ret = -EIO; 543 goto err_up; 544 } 545 546 memset(&ah_attr, 0, sizeof ah_attr); 547 ah_attr.type = rdma_ah_find_type(agent->device, 548 file->port->port_num); 549 rdma_ah_set_dlid(&ah_attr, be16_to_cpu(packet->mad.hdr.lid)); 550 rdma_ah_set_sl(&ah_attr, packet->mad.hdr.sl); 551 rdma_ah_set_path_bits(&ah_attr, packet->mad.hdr.path_bits); 552 rdma_ah_set_port_num(&ah_attr, file->port->port_num); 553 if (packet->mad.hdr.grh_present) { 554 rdma_ah_set_grh(&ah_attr, NULL, 555 be32_to_cpu(packet->mad.hdr.flow_label), 556 packet->mad.hdr.gid_index, 557 packet->mad.hdr.hop_limit, 558 packet->mad.hdr.traffic_class); 559 rdma_ah_set_dgid_raw(&ah_attr, packet->mad.hdr.gid); 560 } 561 562 ah = rdma_create_user_ah(agent->qp->pd, &ah_attr, NULL); 563 if (IS_ERR(ah)) { 564 ret = PTR_ERR(ah); 565 goto err_up; 566 } 567 568 rmpp_mad_hdr = (struct ib_rmpp_mad_hdr *)packet->mad.data; 569 hdr_len = ib_get_mad_data_offset(rmpp_mad_hdr->mad_hdr.mgmt_class); 570 571 if (ib_is_mad_class_rmpp(rmpp_mad_hdr->mad_hdr.mgmt_class) 572 && ib_mad_kernel_rmpp_agent(agent)) { 573 copy_offset = IB_MGMT_RMPP_HDR; 574 rmpp_active = ib_get_rmpp_flags(&rmpp_mad_hdr->rmpp_hdr) & 575 IB_MGMT_RMPP_FLAG_ACTIVE; 576 } else { 577 copy_offset = IB_MGMT_MAD_HDR; 578 rmpp_active = 0; 579 } 580 581 base_version = ((struct ib_mad_hdr *)&packet->mad.data)->base_version; 582 data_len = count - hdr_size(file) - hdr_len; 583 packet->msg = ib_create_send_mad(agent, 584 be32_to_cpu(packet->mad.hdr.qpn), 585 packet->mad.hdr.pkey_index, rmpp_active, 586 hdr_len, data_len, GFP_KERNEL, 587 base_version); 588 if (IS_ERR(packet->msg)) { 589 ret = PTR_ERR(packet->msg); 590 goto err_ah; 591 } 592 593 packet->msg->ah = ah; 594 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms; 595 packet->msg->retries = packet->mad.hdr.retries; 596 packet->msg->context[0] = packet; 597 598 /* Copy MAD header. Any RMPP header is already in place. */ 599 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR); 600 601 if (!rmpp_active) { 602 if (copy_from_user(packet->msg->mad + copy_offset, 603 buf + copy_offset, 604 hdr_len + data_len - copy_offset)) { 605 ret = -EFAULT; 606 goto err_msg; 607 } 608 } else { 609 ret = copy_rmpp_mad(packet->msg, buf); 610 if (ret) 611 goto err_msg; 612 } 613 614 /* 615 * Set the high-order part of the transaction ID to make MADs from 616 * different agents unique, and allow routing responses back to the 617 * original requestor. 618 */ 619 if (!ib_response_mad(packet->msg->mad)) { 620 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid; 621 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 | 622 (be64_to_cpup(tid) & 0xffffffff)); 623 rmpp_mad_hdr->mad_hdr.tid = *tid; 624 } 625 626 if (!ib_mad_kernel_rmpp_agent(agent) 627 && ib_is_mad_class_rmpp(rmpp_mad_hdr->mad_hdr.mgmt_class) 628 && (ib_get_rmpp_flags(&rmpp_mad_hdr->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE)) { 629 spin_lock_irq(&file->send_lock); 630 list_add_tail(&packet->list, &file->send_list); 631 spin_unlock_irq(&file->send_lock); 632 } else { 633 spin_lock_irq(&file->send_lock); 634 ret = is_duplicate(file, packet); 635 if (!ret) 636 list_add_tail(&packet->list, &file->send_list); 637 spin_unlock_irq(&file->send_lock); 638 if (ret) { 639 ret = -EINVAL; 640 goto err_msg; 641 } 642 } 643 644 ret = ib_post_send_mad(packet->msg, NULL); 645 if (ret) 646 goto err_send; 647 648 mutex_unlock(&file->mutex); 649 return count; 650 651 err_send: 652 dequeue_send(file, packet); 653 err_msg: 654 ib_free_send_mad(packet->msg); 655 err_ah: 656 rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE); 657 err_up: 658 mutex_unlock(&file->mutex); 659 err: 660 kfree(packet); 661 return ret; 662 } 663 664 static __poll_t ib_umad_poll(struct file *filp, struct poll_table_struct *wait) 665 { 666 struct ib_umad_file *file = filp->private_data; 667 668 /* we will always be able to post a MAD send */ 669 __poll_t mask = EPOLLOUT | EPOLLWRNORM; 670 671 mutex_lock(&file->mutex); 672 poll_wait(filp, &file->recv_wait, wait); 673 674 if (!list_empty(&file->recv_list)) 675 mask |= EPOLLIN | EPOLLRDNORM; 676 if (file->agents_dead) 677 mask = EPOLLERR; 678 mutex_unlock(&file->mutex); 679 680 return mask; 681 } 682 683 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg, 684 int compat_method_mask) 685 { 686 struct ib_user_mad_reg_req ureq; 687 struct ib_mad_reg_req req; 688 struct ib_mad_agent *agent = NULL; 689 int agent_id; 690 int ret; 691 692 mutex_lock(&file->port->file_mutex); 693 mutex_lock(&file->mutex); 694 695 if (!file->port->ib_dev) { 696 dev_notice(&file->port->dev, "%s: invalid device\n", __func__); 697 ret = -EPIPE; 698 goto out; 699 } 700 701 if (copy_from_user(&ureq, arg, sizeof ureq)) { 702 ret = -EFAULT; 703 goto out; 704 } 705 706 if (ureq.qpn != 0 && ureq.qpn != 1) { 707 dev_notice(&file->port->dev, 708 "%s: invalid QPN %u specified\n", __func__, 709 ureq.qpn); 710 ret = -EINVAL; 711 goto out; 712 } 713 714 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id) 715 if (!__get_agent(file, agent_id)) 716 goto found; 717 718 dev_notice(&file->port->dev, "%s: Max Agents (%u) reached\n", __func__, 719 IB_UMAD_MAX_AGENTS); 720 721 ret = -ENOMEM; 722 goto out; 723 724 found: 725 if (ureq.mgmt_class) { 726 memset(&req, 0, sizeof(req)); 727 req.mgmt_class = ureq.mgmt_class; 728 req.mgmt_class_version = ureq.mgmt_class_version; 729 memcpy(req.oui, ureq.oui, sizeof req.oui); 730 731 if (compat_method_mask) { 732 u32 *umm = (u32 *) ureq.method_mask; 733 int i; 734 735 for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i) 736 req.method_mask[i] = 737 umm[i * 2] | ((u64) umm[i * 2 + 1] << 32); 738 } else 739 memcpy(req.method_mask, ureq.method_mask, 740 sizeof req.method_mask); 741 } 742 743 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num, 744 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI, 745 ureq.mgmt_class ? &req : NULL, 746 ureq.rmpp_version, 747 send_handler, recv_handler, file, 0); 748 if (IS_ERR(agent)) { 749 ret = PTR_ERR(agent); 750 agent = NULL; 751 goto out; 752 } 753 754 if (put_user(agent_id, 755 (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) { 756 ret = -EFAULT; 757 goto out; 758 } 759 760 if (!file->already_used) { 761 file->already_used = 1; 762 if (!file->use_pkey_index) { 763 dev_warn(&file->port->dev, 764 "process %s did not enable P_Key index support.\n", 765 current->comm); 766 dev_warn(&file->port->dev, 767 " Documentation/infiniband/user_mad.rst has info on the new ABI.\n"); 768 } 769 } 770 771 file->agent[agent_id] = agent; 772 ret = 0; 773 774 out: 775 mutex_unlock(&file->mutex); 776 777 if (ret && agent) 778 ib_unregister_mad_agent(agent); 779 780 mutex_unlock(&file->port->file_mutex); 781 782 return ret; 783 } 784 785 static int ib_umad_reg_agent2(struct ib_umad_file *file, void __user *arg) 786 { 787 struct ib_user_mad_reg_req2 ureq; 788 struct ib_mad_reg_req req; 789 struct ib_mad_agent *agent = NULL; 790 int agent_id; 791 int ret; 792 793 mutex_lock(&file->port->file_mutex); 794 mutex_lock(&file->mutex); 795 796 if (!file->port->ib_dev) { 797 dev_notice(&file->port->dev, "%s: invalid device\n", __func__); 798 ret = -EPIPE; 799 goto out; 800 } 801 802 if (copy_from_user(&ureq, arg, sizeof(ureq))) { 803 ret = -EFAULT; 804 goto out; 805 } 806 807 if (ureq.qpn != 0 && ureq.qpn != 1) { 808 dev_notice(&file->port->dev, "%s: invalid QPN %u specified\n", 809 __func__, ureq.qpn); 810 ret = -EINVAL; 811 goto out; 812 } 813 814 if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) { 815 dev_notice(&file->port->dev, 816 "%s failed: invalid registration flags specified 0x%x; supported 0x%x\n", 817 __func__, ureq.flags, IB_USER_MAD_REG_FLAGS_CAP); 818 ret = -EINVAL; 819 820 if (put_user((u32)IB_USER_MAD_REG_FLAGS_CAP, 821 (u32 __user *) (arg + offsetof(struct 822 ib_user_mad_reg_req2, flags)))) 823 ret = -EFAULT; 824 825 goto out; 826 } 827 828 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id) 829 if (!__get_agent(file, agent_id)) 830 goto found; 831 832 dev_notice(&file->port->dev, "%s: Max Agents (%u) reached\n", __func__, 833 IB_UMAD_MAX_AGENTS); 834 ret = -ENOMEM; 835 goto out; 836 837 found: 838 if (ureq.mgmt_class) { 839 memset(&req, 0, sizeof(req)); 840 req.mgmt_class = ureq.mgmt_class; 841 req.mgmt_class_version = ureq.mgmt_class_version; 842 if (ureq.oui & 0xff000000) { 843 dev_notice(&file->port->dev, 844 "%s failed: oui invalid 0x%08x\n", __func__, 845 ureq.oui); 846 ret = -EINVAL; 847 goto out; 848 } 849 req.oui[2] = ureq.oui & 0x0000ff; 850 req.oui[1] = (ureq.oui & 0x00ff00) >> 8; 851 req.oui[0] = (ureq.oui & 0xff0000) >> 16; 852 memcpy(req.method_mask, ureq.method_mask, 853 sizeof(req.method_mask)); 854 } 855 856 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num, 857 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI, 858 ureq.mgmt_class ? &req : NULL, 859 ureq.rmpp_version, 860 send_handler, recv_handler, file, 861 ureq.flags); 862 if (IS_ERR(agent)) { 863 ret = PTR_ERR(agent); 864 agent = NULL; 865 goto out; 866 } 867 868 if (put_user(agent_id, 869 (u32 __user *)(arg + 870 offsetof(struct ib_user_mad_reg_req2, id)))) { 871 ret = -EFAULT; 872 goto out; 873 } 874 875 if (!file->already_used) { 876 file->already_used = 1; 877 file->use_pkey_index = 1; 878 } 879 880 file->agent[agent_id] = agent; 881 ret = 0; 882 883 out: 884 mutex_unlock(&file->mutex); 885 886 if (ret && agent) 887 ib_unregister_mad_agent(agent); 888 889 mutex_unlock(&file->port->file_mutex); 890 891 return ret; 892 } 893 894 895 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg) 896 { 897 struct ib_mad_agent *agent = NULL; 898 u32 id; 899 int ret = 0; 900 901 if (get_user(id, arg)) 902 return -EFAULT; 903 if (id >= IB_UMAD_MAX_AGENTS) 904 return -EINVAL; 905 906 mutex_lock(&file->port->file_mutex); 907 mutex_lock(&file->mutex); 908 909 id = array_index_nospec(id, IB_UMAD_MAX_AGENTS); 910 if (!__get_agent(file, id)) { 911 ret = -EINVAL; 912 goto out; 913 } 914 915 agent = file->agent[id]; 916 file->agent[id] = NULL; 917 918 out: 919 mutex_unlock(&file->mutex); 920 921 if (agent) 922 ib_unregister_mad_agent(agent); 923 924 mutex_unlock(&file->port->file_mutex); 925 926 return ret; 927 } 928 929 static long ib_umad_enable_pkey(struct ib_umad_file *file) 930 { 931 int ret = 0; 932 933 mutex_lock(&file->mutex); 934 if (file->already_used) 935 ret = -EINVAL; 936 else 937 file->use_pkey_index = 1; 938 mutex_unlock(&file->mutex); 939 940 return ret; 941 } 942 943 static long ib_umad_ioctl(struct file *filp, unsigned int cmd, 944 unsigned long arg) 945 { 946 switch (cmd) { 947 case IB_USER_MAD_REGISTER_AGENT: 948 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0); 949 case IB_USER_MAD_UNREGISTER_AGENT: 950 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg); 951 case IB_USER_MAD_ENABLE_PKEY: 952 return ib_umad_enable_pkey(filp->private_data); 953 case IB_USER_MAD_REGISTER_AGENT2: 954 return ib_umad_reg_agent2(filp->private_data, (void __user *) arg); 955 default: 956 return -ENOIOCTLCMD; 957 } 958 } 959 960 #ifdef CONFIG_COMPAT 961 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd, 962 unsigned long arg) 963 { 964 switch (cmd) { 965 case IB_USER_MAD_REGISTER_AGENT: 966 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1); 967 case IB_USER_MAD_UNREGISTER_AGENT: 968 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg)); 969 case IB_USER_MAD_ENABLE_PKEY: 970 return ib_umad_enable_pkey(filp->private_data); 971 case IB_USER_MAD_REGISTER_AGENT2: 972 return ib_umad_reg_agent2(filp->private_data, compat_ptr(arg)); 973 default: 974 return -ENOIOCTLCMD; 975 } 976 } 977 #endif 978 979 /* 980 * ib_umad_open() does not need the BKL: 981 * 982 * - the ib_umad_port structures are properly reference counted, and 983 * everything else is purely local to the file being created, so 984 * races against other open calls are not a problem; 985 * - the ioctl method does not affect any global state outside of the 986 * file structure being operated on; 987 */ 988 static int ib_umad_open(struct inode *inode, struct file *filp) 989 { 990 struct ib_umad_port *port; 991 struct ib_umad_file *file; 992 int ret = 0; 993 994 port = container_of(inode->i_cdev, struct ib_umad_port, cdev); 995 996 mutex_lock(&port->file_mutex); 997 998 if (!port->ib_dev) { 999 ret = -ENXIO; 1000 goto out; 1001 } 1002 1003 if (!rdma_dev_access_netns(port->ib_dev, current->nsproxy->net_ns)) { 1004 ret = -EPERM; 1005 goto out; 1006 } 1007 1008 file = kzalloc(sizeof(*file), GFP_KERNEL); 1009 if (!file) { 1010 ret = -ENOMEM; 1011 goto out; 1012 } 1013 1014 mutex_init(&file->mutex); 1015 spin_lock_init(&file->send_lock); 1016 INIT_LIST_HEAD(&file->recv_list); 1017 INIT_LIST_HEAD(&file->send_list); 1018 init_waitqueue_head(&file->recv_wait); 1019 1020 file->port = port; 1021 filp->private_data = file; 1022 1023 list_add_tail(&file->port_list, &port->file_list); 1024 1025 stream_open(inode, filp); 1026 out: 1027 mutex_unlock(&port->file_mutex); 1028 return ret; 1029 } 1030 1031 static int ib_umad_close(struct inode *inode, struct file *filp) 1032 { 1033 struct ib_umad_file *file = filp->private_data; 1034 struct ib_umad_packet *packet, *tmp; 1035 int already_dead; 1036 int i; 1037 1038 mutex_lock(&file->port->file_mutex); 1039 mutex_lock(&file->mutex); 1040 1041 already_dead = file->agents_dead; 1042 file->agents_dead = 1; 1043 1044 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) { 1045 if (packet->recv_wc) 1046 ib_free_recv_mad(packet->recv_wc); 1047 kfree(packet); 1048 } 1049 1050 list_del(&file->port_list); 1051 1052 mutex_unlock(&file->mutex); 1053 1054 if (!already_dead) 1055 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i) 1056 if (file->agent[i]) 1057 ib_unregister_mad_agent(file->agent[i]); 1058 1059 mutex_unlock(&file->port->file_mutex); 1060 mutex_destroy(&file->mutex); 1061 kfree(file); 1062 return 0; 1063 } 1064 1065 static const struct file_operations umad_fops = { 1066 .owner = THIS_MODULE, 1067 .read = ib_umad_read, 1068 .write = ib_umad_write, 1069 .poll = ib_umad_poll, 1070 .unlocked_ioctl = ib_umad_ioctl, 1071 #ifdef CONFIG_COMPAT 1072 .compat_ioctl = ib_umad_compat_ioctl, 1073 #endif 1074 .open = ib_umad_open, 1075 .release = ib_umad_close, 1076 .llseek = no_llseek, 1077 }; 1078 1079 static int ib_umad_sm_open(struct inode *inode, struct file *filp) 1080 { 1081 struct ib_umad_port *port; 1082 struct ib_port_modify props = { 1083 .set_port_cap_mask = IB_PORT_SM 1084 }; 1085 int ret; 1086 1087 port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev); 1088 1089 if (filp->f_flags & O_NONBLOCK) { 1090 if (down_trylock(&port->sm_sem)) { 1091 ret = -EAGAIN; 1092 goto fail; 1093 } 1094 } else { 1095 if (down_interruptible(&port->sm_sem)) { 1096 ret = -ERESTARTSYS; 1097 goto fail; 1098 } 1099 } 1100 1101 if (!rdma_dev_access_netns(port->ib_dev, current->nsproxy->net_ns)) { 1102 ret = -EPERM; 1103 goto err_up_sem; 1104 } 1105 1106 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props); 1107 if (ret) 1108 goto err_up_sem; 1109 1110 filp->private_data = port; 1111 1112 nonseekable_open(inode, filp); 1113 return 0; 1114 1115 err_up_sem: 1116 up(&port->sm_sem); 1117 1118 fail: 1119 return ret; 1120 } 1121 1122 static int ib_umad_sm_close(struct inode *inode, struct file *filp) 1123 { 1124 struct ib_umad_port *port = filp->private_data; 1125 struct ib_port_modify props = { 1126 .clr_port_cap_mask = IB_PORT_SM 1127 }; 1128 int ret = 0; 1129 1130 mutex_lock(&port->file_mutex); 1131 if (port->ib_dev) 1132 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props); 1133 mutex_unlock(&port->file_mutex); 1134 1135 up(&port->sm_sem); 1136 1137 return ret; 1138 } 1139 1140 static const struct file_operations umad_sm_fops = { 1141 .owner = THIS_MODULE, 1142 .open = ib_umad_sm_open, 1143 .release = ib_umad_sm_close, 1144 .llseek = no_llseek, 1145 }; 1146 1147 static struct ib_umad_port *get_port(struct ib_device *ibdev, 1148 struct ib_umad_device *umad_dev, 1149 u32 port) 1150 { 1151 if (!umad_dev) 1152 return ERR_PTR(-EOPNOTSUPP); 1153 if (!rdma_is_port_valid(ibdev, port)) 1154 return ERR_PTR(-EINVAL); 1155 if (!rdma_cap_ib_mad(ibdev, port)) 1156 return ERR_PTR(-EOPNOTSUPP); 1157 1158 return &umad_dev->ports[port - rdma_start_port(ibdev)]; 1159 } 1160 1161 static int ib_umad_get_nl_info(struct ib_device *ibdev, void *client_data, 1162 struct ib_client_nl_info *res) 1163 { 1164 struct ib_umad_port *port = get_port(ibdev, client_data, res->port); 1165 1166 if (IS_ERR(port)) 1167 return PTR_ERR(port); 1168 1169 res->abi = IB_USER_MAD_ABI_VERSION; 1170 res->cdev = &port->dev; 1171 return 0; 1172 } 1173 1174 static struct ib_client umad_client = { 1175 .name = "umad", 1176 .add = ib_umad_add_one, 1177 .remove = ib_umad_remove_one, 1178 .get_nl_info = ib_umad_get_nl_info, 1179 }; 1180 MODULE_ALIAS_RDMA_CLIENT("umad"); 1181 1182 static int ib_issm_get_nl_info(struct ib_device *ibdev, void *client_data, 1183 struct ib_client_nl_info *res) 1184 { 1185 struct ib_umad_port *port = get_port(ibdev, client_data, res->port); 1186 1187 if (IS_ERR(port)) 1188 return PTR_ERR(port); 1189 1190 res->abi = IB_USER_MAD_ABI_VERSION; 1191 res->cdev = &port->sm_dev; 1192 return 0; 1193 } 1194 1195 static struct ib_client issm_client = { 1196 .name = "issm", 1197 .get_nl_info = ib_issm_get_nl_info, 1198 }; 1199 MODULE_ALIAS_RDMA_CLIENT("issm"); 1200 1201 static ssize_t ibdev_show(struct device *dev, struct device_attribute *attr, 1202 char *buf) 1203 { 1204 struct ib_umad_port *port = dev_get_drvdata(dev); 1205 1206 if (!port) 1207 return -ENODEV; 1208 1209 return sysfs_emit(buf, "%s\n", dev_name(&port->ib_dev->dev)); 1210 } 1211 static DEVICE_ATTR_RO(ibdev); 1212 1213 static ssize_t port_show(struct device *dev, struct device_attribute *attr, 1214 char *buf) 1215 { 1216 struct ib_umad_port *port = dev_get_drvdata(dev); 1217 1218 if (!port) 1219 return -ENODEV; 1220 1221 return sysfs_emit(buf, "%d\n", port->port_num); 1222 } 1223 static DEVICE_ATTR_RO(port); 1224 1225 static struct attribute *umad_class_dev_attrs[] = { 1226 &dev_attr_ibdev.attr, 1227 &dev_attr_port.attr, 1228 NULL, 1229 }; 1230 ATTRIBUTE_GROUPS(umad_class_dev); 1231 1232 static char *umad_devnode(const struct device *dev, umode_t *mode) 1233 { 1234 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 1235 } 1236 1237 static ssize_t abi_version_show(const struct class *class, 1238 const struct class_attribute *attr, char *buf) 1239 { 1240 return sysfs_emit(buf, "%d\n", IB_USER_MAD_ABI_VERSION); 1241 } 1242 static CLASS_ATTR_RO(abi_version); 1243 1244 static struct attribute *umad_class_attrs[] = { 1245 &class_attr_abi_version.attr, 1246 NULL, 1247 }; 1248 ATTRIBUTE_GROUPS(umad_class); 1249 1250 static struct class umad_class = { 1251 .name = "infiniband_mad", 1252 .devnode = umad_devnode, 1253 .class_groups = umad_class_groups, 1254 .dev_groups = umad_class_dev_groups, 1255 }; 1256 1257 static void ib_umad_release_port(struct device *device) 1258 { 1259 struct ib_umad_port *port = dev_get_drvdata(device); 1260 struct ib_umad_device *umad_dev = port->umad_dev; 1261 1262 ib_umad_dev_put(umad_dev); 1263 } 1264 1265 static void ib_umad_init_port_dev(struct device *dev, 1266 struct ib_umad_port *port, 1267 const struct ib_device *device) 1268 { 1269 device_initialize(dev); 1270 ib_umad_dev_get(port->umad_dev); 1271 dev->class = &umad_class; 1272 dev->parent = device->dev.parent; 1273 dev_set_drvdata(dev, port); 1274 dev->release = ib_umad_release_port; 1275 } 1276 1277 static int ib_umad_init_port(struct ib_device *device, int port_num, 1278 struct ib_umad_device *umad_dev, 1279 struct ib_umad_port *port) 1280 { 1281 int devnum; 1282 dev_t base_umad; 1283 dev_t base_issm; 1284 int ret; 1285 1286 devnum = ida_alloc_max(&umad_ida, IB_UMAD_MAX_PORTS - 1, GFP_KERNEL); 1287 if (devnum < 0) 1288 return -1; 1289 port->dev_num = devnum; 1290 if (devnum >= IB_UMAD_NUM_FIXED_MINOR) { 1291 base_umad = dynamic_umad_dev + devnum - IB_UMAD_NUM_FIXED_MINOR; 1292 base_issm = dynamic_issm_dev + devnum - IB_UMAD_NUM_FIXED_MINOR; 1293 } else { 1294 base_umad = devnum + base_umad_dev; 1295 base_issm = devnum + base_issm_dev; 1296 } 1297 1298 port->ib_dev = device; 1299 port->umad_dev = umad_dev; 1300 port->port_num = port_num; 1301 sema_init(&port->sm_sem, 1); 1302 mutex_init(&port->file_mutex); 1303 INIT_LIST_HEAD(&port->file_list); 1304 1305 ib_umad_init_port_dev(&port->dev, port, device); 1306 port->dev.devt = base_umad; 1307 dev_set_name(&port->dev, "umad%d", port->dev_num); 1308 cdev_init(&port->cdev, &umad_fops); 1309 port->cdev.owner = THIS_MODULE; 1310 1311 ret = cdev_device_add(&port->cdev, &port->dev); 1312 if (ret) 1313 goto err_cdev; 1314 1315 ib_umad_init_port_dev(&port->sm_dev, port, device); 1316 port->sm_dev.devt = base_issm; 1317 dev_set_name(&port->sm_dev, "issm%d", port->dev_num); 1318 cdev_init(&port->sm_cdev, &umad_sm_fops); 1319 port->sm_cdev.owner = THIS_MODULE; 1320 1321 ret = cdev_device_add(&port->sm_cdev, &port->sm_dev); 1322 if (ret) 1323 goto err_dev; 1324 1325 return 0; 1326 1327 err_dev: 1328 put_device(&port->sm_dev); 1329 cdev_device_del(&port->cdev, &port->dev); 1330 err_cdev: 1331 put_device(&port->dev); 1332 ida_free(&umad_ida, devnum); 1333 return ret; 1334 } 1335 1336 static void ib_umad_kill_port(struct ib_umad_port *port) 1337 { 1338 struct ib_umad_file *file; 1339 int id; 1340 1341 cdev_device_del(&port->sm_cdev, &port->sm_dev); 1342 cdev_device_del(&port->cdev, &port->dev); 1343 1344 mutex_lock(&port->file_mutex); 1345 1346 /* Mark ib_dev NULL and block ioctl or other file ops to progress 1347 * further. 1348 */ 1349 port->ib_dev = NULL; 1350 1351 list_for_each_entry(file, &port->file_list, port_list) { 1352 mutex_lock(&file->mutex); 1353 file->agents_dead = 1; 1354 wake_up_interruptible(&file->recv_wait); 1355 mutex_unlock(&file->mutex); 1356 1357 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id) 1358 if (file->agent[id]) 1359 ib_unregister_mad_agent(file->agent[id]); 1360 } 1361 1362 mutex_unlock(&port->file_mutex); 1363 1364 ida_free(&umad_ida, port->dev_num); 1365 1366 /* balances device_initialize() */ 1367 put_device(&port->sm_dev); 1368 put_device(&port->dev); 1369 } 1370 1371 static int ib_umad_add_one(struct ib_device *device) 1372 { 1373 struct ib_umad_device *umad_dev; 1374 int s, e, i; 1375 int count = 0; 1376 int ret; 1377 1378 s = rdma_start_port(device); 1379 e = rdma_end_port(device); 1380 1381 umad_dev = kzalloc(struct_size(umad_dev, ports, e - s + 1), GFP_KERNEL); 1382 if (!umad_dev) 1383 return -ENOMEM; 1384 1385 kref_init(&umad_dev->kref); 1386 for (i = s; i <= e; ++i) { 1387 if (!rdma_cap_ib_mad(device, i)) 1388 continue; 1389 1390 ret = ib_umad_init_port(device, i, umad_dev, 1391 &umad_dev->ports[i - s]); 1392 if (ret) 1393 goto err; 1394 1395 count++; 1396 } 1397 1398 if (!count) { 1399 ret = -EOPNOTSUPP; 1400 goto free; 1401 } 1402 1403 ib_set_client_data(device, &umad_client, umad_dev); 1404 1405 return 0; 1406 1407 err: 1408 while (--i >= s) { 1409 if (!rdma_cap_ib_mad(device, i)) 1410 continue; 1411 1412 ib_umad_kill_port(&umad_dev->ports[i - s]); 1413 } 1414 free: 1415 /* balances kref_init */ 1416 ib_umad_dev_put(umad_dev); 1417 return ret; 1418 } 1419 1420 static void ib_umad_remove_one(struct ib_device *device, void *client_data) 1421 { 1422 struct ib_umad_device *umad_dev = client_data; 1423 unsigned int i; 1424 1425 rdma_for_each_port (device, i) { 1426 if (rdma_cap_ib_mad(device, i)) 1427 ib_umad_kill_port( 1428 &umad_dev->ports[i - rdma_start_port(device)]); 1429 } 1430 /* balances kref_init() */ 1431 ib_umad_dev_put(umad_dev); 1432 } 1433 1434 static int __init ib_umad_init(void) 1435 { 1436 int ret; 1437 1438 ret = register_chrdev_region(base_umad_dev, 1439 IB_UMAD_NUM_FIXED_MINOR * 2, 1440 umad_class.name); 1441 if (ret) { 1442 pr_err("couldn't register device number\n"); 1443 goto out; 1444 } 1445 1446 ret = alloc_chrdev_region(&dynamic_umad_dev, 0, 1447 IB_UMAD_NUM_DYNAMIC_MINOR * 2, 1448 umad_class.name); 1449 if (ret) { 1450 pr_err("couldn't register dynamic device number\n"); 1451 goto out_alloc; 1452 } 1453 dynamic_issm_dev = dynamic_umad_dev + IB_UMAD_NUM_DYNAMIC_MINOR; 1454 1455 ret = class_register(&umad_class); 1456 if (ret) { 1457 pr_err("couldn't create class infiniband_mad\n"); 1458 goto out_chrdev; 1459 } 1460 1461 ret = ib_register_client(&umad_client); 1462 if (ret) 1463 goto out_class; 1464 1465 ret = ib_register_client(&issm_client); 1466 if (ret) 1467 goto out_client; 1468 1469 return 0; 1470 1471 out_client: 1472 ib_unregister_client(&umad_client); 1473 out_class: 1474 class_unregister(&umad_class); 1475 1476 out_chrdev: 1477 unregister_chrdev_region(dynamic_umad_dev, 1478 IB_UMAD_NUM_DYNAMIC_MINOR * 2); 1479 1480 out_alloc: 1481 unregister_chrdev_region(base_umad_dev, 1482 IB_UMAD_NUM_FIXED_MINOR * 2); 1483 1484 out: 1485 return ret; 1486 } 1487 1488 static void __exit ib_umad_cleanup(void) 1489 { 1490 ib_unregister_client(&issm_client); 1491 ib_unregister_client(&umad_client); 1492 class_unregister(&umad_class); 1493 unregister_chrdev_region(base_umad_dev, 1494 IB_UMAD_NUM_FIXED_MINOR * 2); 1495 unregister_chrdev_region(dynamic_umad_dev, 1496 IB_UMAD_NUM_DYNAMIC_MINOR * 2); 1497 } 1498 1499 module_init(ib_umad_init); 1500 module_exit(ib_umad_cleanup); 1501