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