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 #include <linux/module.h> 37 #include <linux/init.h> 38 #include <linux/device.h> 39 #include <linux/err.h> 40 #include <linux/fs.h> 41 #include <linux/cdev.h> 42 #include <linux/dma-mapping.h> 43 #include <linux/poll.h> 44 #include <linux/mutex.h> 45 #include <linux/kref.h> 46 #include <linux/compat.h> 47 #include <linux/sched.h> 48 #include <linux/semaphore.h> 49 #include <linux/slab.h> 50 51 #include <asm/uaccess.h> 52 53 #include <rdma/ib_mad.h> 54 #include <rdma/ib_user_mad.h> 55 56 MODULE_AUTHOR("Roland Dreier"); 57 MODULE_DESCRIPTION("InfiniBand userspace MAD packet access"); 58 MODULE_LICENSE("Dual BSD/GPL"); 59 60 enum { 61 IB_UMAD_MAX_PORTS = 64, 62 IB_UMAD_MAX_AGENTS = 32, 63 64 IB_UMAD_MAJOR = 231, 65 IB_UMAD_MINOR_BASE = 0 66 }; 67 68 /* 69 * Our lifetime rules for these structs are the following: 70 * device special file is opened, we take a reference on the 71 * ib_umad_port's struct ib_umad_device. We drop these 72 * references in the corresponding close(). 73 * 74 * In addition to references coming from open character devices, there 75 * is one more reference to each ib_umad_device representing the 76 * module's reference taken when allocating the ib_umad_device in 77 * ib_umad_add_one(). 78 * 79 * When destroying an ib_umad_device, we drop the module's reference. 80 */ 81 82 struct ib_umad_port { 83 struct cdev cdev; 84 struct device *dev; 85 86 struct cdev sm_cdev; 87 struct device *sm_dev; 88 struct semaphore sm_sem; 89 90 struct mutex file_mutex; 91 struct list_head file_list; 92 93 struct ib_device *ib_dev; 94 struct ib_umad_device *umad_dev; 95 int dev_num; 96 u8 port_num; 97 }; 98 99 struct ib_umad_device { 100 int start_port, end_port; 101 struct kref ref; 102 struct ib_umad_port port[0]; 103 }; 104 105 struct ib_umad_file { 106 struct mutex mutex; 107 struct ib_umad_port *port; 108 struct list_head recv_list; 109 struct list_head send_list; 110 struct list_head port_list; 111 spinlock_t send_lock; 112 wait_queue_head_t recv_wait; 113 struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS]; 114 int agents_dead; 115 u8 use_pkey_index; 116 u8 already_used; 117 }; 118 119 struct ib_umad_packet { 120 struct ib_mad_send_buf *msg; 121 struct ib_mad_recv_wc *recv_wc; 122 struct list_head list; 123 int length; 124 struct ib_user_mad mad; 125 }; 126 127 static struct class *umad_class; 128 129 static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE); 130 131 static DEFINE_SPINLOCK(port_lock); 132 static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS); 133 134 static void ib_umad_add_one(struct ib_device *device); 135 static void ib_umad_remove_one(struct ib_device *device); 136 137 static void ib_umad_release_dev(struct kref *ref) 138 { 139 struct ib_umad_device *dev = 140 container_of(ref, struct ib_umad_device, ref); 141 142 kfree(dev); 143 } 144 145 static int hdr_size(struct ib_umad_file *file) 146 { 147 return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) : 148 sizeof (struct ib_user_mad_hdr_old); 149 } 150 151 /* caller must hold file->mutex */ 152 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id) 153 { 154 return file->agents_dead ? NULL : file->agent[id]; 155 } 156 157 static int queue_packet(struct ib_umad_file *file, 158 struct ib_mad_agent *agent, 159 struct ib_umad_packet *packet) 160 { 161 int ret = 1; 162 163 mutex_lock(&file->mutex); 164 165 for (packet->mad.hdr.id = 0; 166 packet->mad.hdr.id < IB_UMAD_MAX_AGENTS; 167 packet->mad.hdr.id++) 168 if (agent == __get_agent(file, packet->mad.hdr.id)) { 169 list_add_tail(&packet->list, &file->recv_list); 170 wake_up_interruptible(&file->recv_wait); 171 ret = 0; 172 break; 173 } 174 175 mutex_unlock(&file->mutex); 176 177 return ret; 178 } 179 180 static void dequeue_send(struct ib_umad_file *file, 181 struct ib_umad_packet *packet) 182 { 183 spin_lock_irq(&file->send_lock); 184 list_del(&packet->list); 185 spin_unlock_irq(&file->send_lock); 186 } 187 188 static void send_handler(struct ib_mad_agent *agent, 189 struct ib_mad_send_wc *send_wc) 190 { 191 struct ib_umad_file *file = agent->context; 192 struct ib_umad_packet *packet = send_wc->send_buf->context[0]; 193 194 dequeue_send(file, packet); 195 ib_destroy_ah(packet->msg->ah); 196 ib_free_send_mad(packet->msg); 197 198 if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) { 199 packet->length = IB_MGMT_MAD_HDR; 200 packet->mad.hdr.status = ETIMEDOUT; 201 if (!queue_packet(file, agent, packet)) 202 return; 203 } 204 kfree(packet); 205 } 206 207 static void recv_handler(struct ib_mad_agent *agent, 208 struct ib_mad_recv_wc *mad_recv_wc) 209 { 210 struct ib_umad_file *file = agent->context; 211 struct ib_umad_packet *packet; 212 213 if (mad_recv_wc->wc->status != IB_WC_SUCCESS) 214 goto err1; 215 216 packet = kzalloc(sizeof *packet, GFP_KERNEL); 217 if (!packet) 218 goto err1; 219 220 packet->length = mad_recv_wc->mad_len; 221 packet->recv_wc = mad_recv_wc; 222 223 packet->mad.hdr.status = 0; 224 packet->mad.hdr.length = hdr_size(file) + mad_recv_wc->mad_len; 225 packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp); 226 packet->mad.hdr.lid = cpu_to_be16(mad_recv_wc->wc->slid); 227 packet->mad.hdr.sl = mad_recv_wc->wc->sl; 228 packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits; 229 packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index; 230 packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH); 231 if (packet->mad.hdr.grh_present) { 232 struct ib_ah_attr ah_attr; 233 234 ib_init_ah_from_wc(agent->device, agent->port_num, 235 mad_recv_wc->wc, mad_recv_wc->recv_buf.grh, 236 &ah_attr); 237 238 packet->mad.hdr.gid_index = ah_attr.grh.sgid_index; 239 packet->mad.hdr.hop_limit = ah_attr.grh.hop_limit; 240 packet->mad.hdr.traffic_class = ah_attr.grh.traffic_class; 241 memcpy(packet->mad.hdr.gid, &ah_attr.grh.dgid, 16); 242 packet->mad.hdr.flow_label = cpu_to_be32(ah_attr.grh.flow_label); 243 } 244 245 if (queue_packet(file, agent, packet)) 246 goto err2; 247 return; 248 249 err2: 250 kfree(packet); 251 err1: 252 ib_free_recv_mad(mad_recv_wc); 253 } 254 255 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf, 256 struct ib_umad_packet *packet, size_t count) 257 { 258 struct ib_mad_recv_buf *recv_buf; 259 int left, seg_payload, offset, max_seg_payload; 260 261 /* We need enough room to copy the first (or only) MAD segment. */ 262 recv_buf = &packet->recv_wc->recv_buf; 263 if ((packet->length <= sizeof (*recv_buf->mad) && 264 count < hdr_size(file) + packet->length) || 265 (packet->length > sizeof (*recv_buf->mad) && 266 count < hdr_size(file) + sizeof (*recv_buf->mad))) 267 return -EINVAL; 268 269 if (copy_to_user(buf, &packet->mad, hdr_size(file))) 270 return -EFAULT; 271 272 buf += hdr_size(file); 273 seg_payload = min_t(int, packet->length, sizeof (*recv_buf->mad)); 274 if (copy_to_user(buf, recv_buf->mad, seg_payload)) 275 return -EFAULT; 276 277 if (seg_payload < packet->length) { 278 /* 279 * Multipacket RMPP MAD message. Copy remainder of message. 280 * Note that last segment may have a shorter payload. 281 */ 282 if (count < hdr_size(file) + packet->length) { 283 /* 284 * The buffer is too small, return the first RMPP segment, 285 * which includes the RMPP message length. 286 */ 287 return -ENOSPC; 288 } 289 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class); 290 max_seg_payload = sizeof (struct ib_mad) - offset; 291 292 for (left = packet->length - seg_payload, buf += seg_payload; 293 left; left -= seg_payload, buf += seg_payload) { 294 recv_buf = container_of(recv_buf->list.next, 295 struct ib_mad_recv_buf, list); 296 seg_payload = min(left, max_seg_payload); 297 if (copy_to_user(buf, ((void *) recv_buf->mad) + offset, 298 seg_payload)) 299 return -EFAULT; 300 } 301 } 302 return hdr_size(file) + packet->length; 303 } 304 305 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf, 306 struct ib_umad_packet *packet, size_t count) 307 { 308 ssize_t size = hdr_size(file) + packet->length; 309 310 if (count < size) 311 return -EINVAL; 312 313 if (copy_to_user(buf, &packet->mad, hdr_size(file))) 314 return -EFAULT; 315 316 buf += hdr_size(file); 317 318 if (copy_to_user(buf, packet->mad.data, packet->length)) 319 return -EFAULT; 320 321 return size; 322 } 323 324 static ssize_t ib_umad_read(struct file *filp, char __user *buf, 325 size_t count, loff_t *pos) 326 { 327 struct ib_umad_file *file = filp->private_data; 328 struct ib_umad_packet *packet; 329 ssize_t ret; 330 331 if (count < hdr_size(file)) 332 return -EINVAL; 333 334 mutex_lock(&file->mutex); 335 336 while (list_empty(&file->recv_list)) { 337 mutex_unlock(&file->mutex); 338 339 if (filp->f_flags & O_NONBLOCK) 340 return -EAGAIN; 341 342 if (wait_event_interruptible(file->recv_wait, 343 !list_empty(&file->recv_list))) 344 return -ERESTARTSYS; 345 346 mutex_lock(&file->mutex); 347 } 348 349 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list); 350 list_del(&packet->list); 351 352 mutex_unlock(&file->mutex); 353 354 if (packet->recv_wc) 355 ret = copy_recv_mad(file, buf, packet, count); 356 else 357 ret = copy_send_mad(file, buf, packet, count); 358 359 if (ret < 0) { 360 /* Requeue packet */ 361 mutex_lock(&file->mutex); 362 list_add(&packet->list, &file->recv_list); 363 mutex_unlock(&file->mutex); 364 } else { 365 if (packet->recv_wc) 366 ib_free_recv_mad(packet->recv_wc); 367 kfree(packet); 368 } 369 return ret; 370 } 371 372 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf) 373 { 374 int left, seg; 375 376 /* Copy class specific header */ 377 if ((msg->hdr_len > IB_MGMT_RMPP_HDR) && 378 copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR, 379 msg->hdr_len - IB_MGMT_RMPP_HDR)) 380 return -EFAULT; 381 382 /* All headers are in place. Copy data segments. */ 383 for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0; 384 seg++, left -= msg->seg_size, buf += msg->seg_size) { 385 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf, 386 min(left, msg->seg_size))) 387 return -EFAULT; 388 } 389 return 0; 390 } 391 392 static int same_destination(struct ib_user_mad_hdr *hdr1, 393 struct ib_user_mad_hdr *hdr2) 394 { 395 if (!hdr1->grh_present && !hdr2->grh_present) 396 return (hdr1->lid == hdr2->lid); 397 398 if (hdr1->grh_present && hdr2->grh_present) 399 return !memcmp(hdr1->gid, hdr2->gid, 16); 400 401 return 0; 402 } 403 404 static int is_duplicate(struct ib_umad_file *file, 405 struct ib_umad_packet *packet) 406 { 407 struct ib_umad_packet *sent_packet; 408 struct ib_mad_hdr *sent_hdr, *hdr; 409 410 hdr = (struct ib_mad_hdr *) packet->mad.data; 411 list_for_each_entry(sent_packet, &file->send_list, list) { 412 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data; 413 414 if ((hdr->tid != sent_hdr->tid) || 415 (hdr->mgmt_class != sent_hdr->mgmt_class)) 416 continue; 417 418 /* 419 * No need to be overly clever here. If two new operations have 420 * the same TID, reject the second as a duplicate. This is more 421 * restrictive than required by the spec. 422 */ 423 if (!ib_response_mad((struct ib_mad *) hdr)) { 424 if (!ib_response_mad((struct ib_mad *) sent_hdr)) 425 return 1; 426 continue; 427 } else if (!ib_response_mad((struct ib_mad *) sent_hdr)) 428 continue; 429 430 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr)) 431 return 1; 432 } 433 434 return 0; 435 } 436 437 static ssize_t ib_umad_write(struct file *filp, const char __user *buf, 438 size_t count, loff_t *pos) 439 { 440 struct ib_umad_file *file = filp->private_data; 441 struct ib_umad_packet *packet; 442 struct ib_mad_agent *agent; 443 struct ib_ah_attr ah_attr; 444 struct ib_ah *ah; 445 struct ib_rmpp_mad *rmpp_mad; 446 __be64 *tid; 447 int ret, data_len, hdr_len, copy_offset, rmpp_active; 448 449 if (count < hdr_size(file) + IB_MGMT_RMPP_HDR) 450 return -EINVAL; 451 452 packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL); 453 if (!packet) 454 return -ENOMEM; 455 456 if (copy_from_user(&packet->mad, buf, hdr_size(file))) { 457 ret = -EFAULT; 458 goto err; 459 } 460 461 if (packet->mad.hdr.id < 0 || 462 packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) { 463 ret = -EINVAL; 464 goto err; 465 } 466 467 buf += hdr_size(file); 468 469 if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) { 470 ret = -EFAULT; 471 goto err; 472 } 473 474 mutex_lock(&file->mutex); 475 476 agent = __get_agent(file, packet->mad.hdr.id); 477 if (!agent) { 478 ret = -EINVAL; 479 goto err_up; 480 } 481 482 memset(&ah_attr, 0, sizeof ah_attr); 483 ah_attr.dlid = be16_to_cpu(packet->mad.hdr.lid); 484 ah_attr.sl = packet->mad.hdr.sl; 485 ah_attr.src_path_bits = packet->mad.hdr.path_bits; 486 ah_attr.port_num = file->port->port_num; 487 if (packet->mad.hdr.grh_present) { 488 ah_attr.ah_flags = IB_AH_GRH; 489 memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16); 490 ah_attr.grh.sgid_index = packet->mad.hdr.gid_index; 491 ah_attr.grh.flow_label = be32_to_cpu(packet->mad.hdr.flow_label); 492 ah_attr.grh.hop_limit = packet->mad.hdr.hop_limit; 493 ah_attr.grh.traffic_class = packet->mad.hdr.traffic_class; 494 } 495 496 ah = ib_create_ah(agent->qp->pd, &ah_attr); 497 if (IS_ERR(ah)) { 498 ret = PTR_ERR(ah); 499 goto err_up; 500 } 501 502 rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data; 503 hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class); 504 if (!ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)) { 505 copy_offset = IB_MGMT_MAD_HDR; 506 rmpp_active = 0; 507 } else { 508 copy_offset = IB_MGMT_RMPP_HDR; 509 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 510 IB_MGMT_RMPP_FLAG_ACTIVE; 511 } 512 513 data_len = count - hdr_size(file) - hdr_len; 514 packet->msg = ib_create_send_mad(agent, 515 be32_to_cpu(packet->mad.hdr.qpn), 516 packet->mad.hdr.pkey_index, rmpp_active, 517 hdr_len, data_len, GFP_KERNEL); 518 if (IS_ERR(packet->msg)) { 519 ret = PTR_ERR(packet->msg); 520 goto err_ah; 521 } 522 523 packet->msg->ah = ah; 524 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms; 525 packet->msg->retries = packet->mad.hdr.retries; 526 packet->msg->context[0] = packet; 527 528 /* Copy MAD header. Any RMPP header is already in place. */ 529 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR); 530 531 if (!rmpp_active) { 532 if (copy_from_user(packet->msg->mad + copy_offset, 533 buf + copy_offset, 534 hdr_len + data_len - copy_offset)) { 535 ret = -EFAULT; 536 goto err_msg; 537 } 538 } else { 539 ret = copy_rmpp_mad(packet->msg, buf); 540 if (ret) 541 goto err_msg; 542 } 543 544 /* 545 * Set the high-order part of the transaction ID to make MADs from 546 * different agents unique, and allow routing responses back to the 547 * original requestor. 548 */ 549 if (!ib_response_mad(packet->msg->mad)) { 550 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid; 551 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 | 552 (be64_to_cpup(tid) & 0xffffffff)); 553 rmpp_mad->mad_hdr.tid = *tid; 554 } 555 556 spin_lock_irq(&file->send_lock); 557 ret = is_duplicate(file, packet); 558 if (!ret) 559 list_add_tail(&packet->list, &file->send_list); 560 spin_unlock_irq(&file->send_lock); 561 if (ret) { 562 ret = -EINVAL; 563 goto err_msg; 564 } 565 566 ret = ib_post_send_mad(packet->msg, NULL); 567 if (ret) 568 goto err_send; 569 570 mutex_unlock(&file->mutex); 571 return count; 572 573 err_send: 574 dequeue_send(file, packet); 575 err_msg: 576 ib_free_send_mad(packet->msg); 577 err_ah: 578 ib_destroy_ah(ah); 579 err_up: 580 mutex_unlock(&file->mutex); 581 err: 582 kfree(packet); 583 return ret; 584 } 585 586 static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait) 587 { 588 struct ib_umad_file *file = filp->private_data; 589 590 /* we will always be able to post a MAD send */ 591 unsigned int mask = POLLOUT | POLLWRNORM; 592 593 poll_wait(filp, &file->recv_wait, wait); 594 595 if (!list_empty(&file->recv_list)) 596 mask |= POLLIN | POLLRDNORM; 597 598 return mask; 599 } 600 601 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg, 602 int compat_method_mask) 603 { 604 struct ib_user_mad_reg_req ureq; 605 struct ib_mad_reg_req req; 606 struct ib_mad_agent *agent = NULL; 607 int agent_id; 608 int ret; 609 610 mutex_lock(&file->port->file_mutex); 611 mutex_lock(&file->mutex); 612 613 if (!file->port->ib_dev) { 614 ret = -EPIPE; 615 goto out; 616 } 617 618 if (copy_from_user(&ureq, arg, sizeof ureq)) { 619 ret = -EFAULT; 620 goto out; 621 } 622 623 if (ureq.qpn != 0 && ureq.qpn != 1) { 624 ret = -EINVAL; 625 goto out; 626 } 627 628 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id) 629 if (!__get_agent(file, agent_id)) 630 goto found; 631 632 ret = -ENOMEM; 633 goto out; 634 635 found: 636 if (ureq.mgmt_class) { 637 req.mgmt_class = ureq.mgmt_class; 638 req.mgmt_class_version = ureq.mgmt_class_version; 639 memcpy(req.oui, ureq.oui, sizeof req.oui); 640 641 if (compat_method_mask) { 642 u32 *umm = (u32 *) ureq.method_mask; 643 int i; 644 645 for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i) 646 req.method_mask[i] = 647 umm[i * 2] | ((u64) umm[i * 2 + 1] << 32); 648 } else 649 memcpy(req.method_mask, ureq.method_mask, 650 sizeof req.method_mask); 651 } 652 653 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num, 654 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI, 655 ureq.mgmt_class ? &req : NULL, 656 ureq.rmpp_version, 657 send_handler, recv_handler, file); 658 if (IS_ERR(agent)) { 659 ret = PTR_ERR(agent); 660 agent = NULL; 661 goto out; 662 } 663 664 if (put_user(agent_id, 665 (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) { 666 ret = -EFAULT; 667 goto out; 668 } 669 670 if (!file->already_used) { 671 file->already_used = 1; 672 if (!file->use_pkey_index) { 673 printk(KERN_WARNING "user_mad: process %s did not enable " 674 "P_Key index support.\n", current->comm); 675 printk(KERN_WARNING "user_mad: Documentation/infiniband/user_mad.txt " 676 "has info on the new ABI.\n"); 677 } 678 } 679 680 file->agent[agent_id] = agent; 681 ret = 0; 682 683 out: 684 mutex_unlock(&file->mutex); 685 686 if (ret && agent) 687 ib_unregister_mad_agent(agent); 688 689 mutex_unlock(&file->port->file_mutex); 690 691 return ret; 692 } 693 694 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg) 695 { 696 struct ib_mad_agent *agent = NULL; 697 u32 id; 698 int ret = 0; 699 700 if (get_user(id, arg)) 701 return -EFAULT; 702 703 mutex_lock(&file->port->file_mutex); 704 mutex_lock(&file->mutex); 705 706 if (id < 0 || id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) { 707 ret = -EINVAL; 708 goto out; 709 } 710 711 agent = file->agent[id]; 712 file->agent[id] = NULL; 713 714 out: 715 mutex_unlock(&file->mutex); 716 717 if (agent) 718 ib_unregister_mad_agent(agent); 719 720 mutex_unlock(&file->port->file_mutex); 721 722 return ret; 723 } 724 725 static long ib_umad_enable_pkey(struct ib_umad_file *file) 726 { 727 int ret = 0; 728 729 mutex_lock(&file->mutex); 730 if (file->already_used) 731 ret = -EINVAL; 732 else 733 file->use_pkey_index = 1; 734 mutex_unlock(&file->mutex); 735 736 return ret; 737 } 738 739 static long ib_umad_ioctl(struct file *filp, unsigned int cmd, 740 unsigned long arg) 741 { 742 switch (cmd) { 743 case IB_USER_MAD_REGISTER_AGENT: 744 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0); 745 case IB_USER_MAD_UNREGISTER_AGENT: 746 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg); 747 case IB_USER_MAD_ENABLE_PKEY: 748 return ib_umad_enable_pkey(filp->private_data); 749 default: 750 return -ENOIOCTLCMD; 751 } 752 } 753 754 #ifdef CONFIG_COMPAT 755 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd, 756 unsigned long arg) 757 { 758 switch (cmd) { 759 case IB_USER_MAD_REGISTER_AGENT: 760 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1); 761 case IB_USER_MAD_UNREGISTER_AGENT: 762 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg)); 763 case IB_USER_MAD_ENABLE_PKEY: 764 return ib_umad_enable_pkey(filp->private_data); 765 default: 766 return -ENOIOCTLCMD; 767 } 768 } 769 #endif 770 771 /* 772 * ib_umad_open() does not need the BKL: 773 * 774 * - the ib_umad_port structures are properly reference counted, and 775 * everything else is purely local to the file being created, so 776 * races against other open calls are not a problem; 777 * - the ioctl method does not affect any global state outside of the 778 * file structure being operated on; 779 */ 780 static int ib_umad_open(struct inode *inode, struct file *filp) 781 { 782 struct ib_umad_port *port; 783 struct ib_umad_file *file; 784 int ret; 785 786 port = container_of(inode->i_cdev, struct ib_umad_port, cdev); 787 if (port) 788 kref_get(&port->umad_dev->ref); 789 else 790 return -ENXIO; 791 792 mutex_lock(&port->file_mutex); 793 794 if (!port->ib_dev) { 795 ret = -ENXIO; 796 goto out; 797 } 798 799 file = kzalloc(sizeof *file, GFP_KERNEL); 800 if (!file) { 801 kref_put(&port->umad_dev->ref, ib_umad_release_dev); 802 ret = -ENOMEM; 803 goto out; 804 } 805 806 mutex_init(&file->mutex); 807 spin_lock_init(&file->send_lock); 808 INIT_LIST_HEAD(&file->recv_list); 809 INIT_LIST_HEAD(&file->send_list); 810 init_waitqueue_head(&file->recv_wait); 811 812 file->port = port; 813 filp->private_data = file; 814 815 list_add_tail(&file->port_list, &port->file_list); 816 817 ret = nonseekable_open(inode, filp); 818 819 out: 820 mutex_unlock(&port->file_mutex); 821 return ret; 822 } 823 824 static int ib_umad_close(struct inode *inode, struct file *filp) 825 { 826 struct ib_umad_file *file = filp->private_data; 827 struct ib_umad_device *dev = file->port->umad_dev; 828 struct ib_umad_packet *packet, *tmp; 829 int already_dead; 830 int i; 831 832 mutex_lock(&file->port->file_mutex); 833 mutex_lock(&file->mutex); 834 835 already_dead = file->agents_dead; 836 file->agents_dead = 1; 837 838 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) { 839 if (packet->recv_wc) 840 ib_free_recv_mad(packet->recv_wc); 841 kfree(packet); 842 } 843 844 list_del(&file->port_list); 845 846 mutex_unlock(&file->mutex); 847 848 if (!already_dead) 849 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i) 850 if (file->agent[i]) 851 ib_unregister_mad_agent(file->agent[i]); 852 853 mutex_unlock(&file->port->file_mutex); 854 855 kfree(file); 856 kref_put(&dev->ref, ib_umad_release_dev); 857 858 return 0; 859 } 860 861 static const struct file_operations umad_fops = { 862 .owner = THIS_MODULE, 863 .read = ib_umad_read, 864 .write = ib_umad_write, 865 .poll = ib_umad_poll, 866 .unlocked_ioctl = ib_umad_ioctl, 867 #ifdef CONFIG_COMPAT 868 .compat_ioctl = ib_umad_compat_ioctl, 869 #endif 870 .open = ib_umad_open, 871 .release = ib_umad_close, 872 .llseek = no_llseek, 873 }; 874 875 static int ib_umad_sm_open(struct inode *inode, struct file *filp) 876 { 877 struct ib_umad_port *port; 878 struct ib_port_modify props = { 879 .set_port_cap_mask = IB_PORT_SM 880 }; 881 int ret; 882 883 port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev); 884 if (port) 885 kref_get(&port->umad_dev->ref); 886 else 887 return -ENXIO; 888 889 if (filp->f_flags & O_NONBLOCK) { 890 if (down_trylock(&port->sm_sem)) { 891 ret = -EAGAIN; 892 goto fail; 893 } 894 } else { 895 if (down_interruptible(&port->sm_sem)) { 896 ret = -ERESTARTSYS; 897 goto fail; 898 } 899 } 900 901 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props); 902 if (ret) { 903 up(&port->sm_sem); 904 goto fail; 905 } 906 907 filp->private_data = port; 908 909 return nonseekable_open(inode, filp); 910 911 fail: 912 kref_put(&port->umad_dev->ref, ib_umad_release_dev); 913 return ret; 914 } 915 916 static int ib_umad_sm_close(struct inode *inode, struct file *filp) 917 { 918 struct ib_umad_port *port = filp->private_data; 919 struct ib_port_modify props = { 920 .clr_port_cap_mask = IB_PORT_SM 921 }; 922 int ret = 0; 923 924 mutex_lock(&port->file_mutex); 925 if (port->ib_dev) 926 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props); 927 mutex_unlock(&port->file_mutex); 928 929 up(&port->sm_sem); 930 931 kref_put(&port->umad_dev->ref, ib_umad_release_dev); 932 933 return ret; 934 } 935 936 static const struct file_operations umad_sm_fops = { 937 .owner = THIS_MODULE, 938 .open = ib_umad_sm_open, 939 .release = ib_umad_sm_close, 940 .llseek = no_llseek, 941 }; 942 943 static struct ib_client umad_client = { 944 .name = "umad", 945 .add = ib_umad_add_one, 946 .remove = ib_umad_remove_one 947 }; 948 949 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr, 950 char *buf) 951 { 952 struct ib_umad_port *port = dev_get_drvdata(dev); 953 954 if (!port) 955 return -ENODEV; 956 957 return sprintf(buf, "%s\n", port->ib_dev->name); 958 } 959 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 960 961 static ssize_t show_port(struct device *dev, struct device_attribute *attr, 962 char *buf) 963 { 964 struct ib_umad_port *port = dev_get_drvdata(dev); 965 966 if (!port) 967 return -ENODEV; 968 969 return sprintf(buf, "%d\n", port->port_num); 970 } 971 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL); 972 973 static CLASS_ATTR_STRING(abi_version, S_IRUGO, 974 __stringify(IB_USER_MAD_ABI_VERSION)); 975 976 static dev_t overflow_maj; 977 static DECLARE_BITMAP(overflow_map, IB_UMAD_MAX_PORTS); 978 static int find_overflow_devnum(void) 979 { 980 int ret; 981 982 if (!overflow_maj) { 983 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UMAD_MAX_PORTS * 2, 984 "infiniband_mad"); 985 if (ret) { 986 printk(KERN_ERR "user_mad: couldn't register dynamic device number\n"); 987 return ret; 988 } 989 } 990 991 ret = find_first_zero_bit(overflow_map, IB_UMAD_MAX_PORTS); 992 if (ret >= IB_UMAD_MAX_PORTS) 993 return -1; 994 995 return ret; 996 } 997 998 static int ib_umad_init_port(struct ib_device *device, int port_num, 999 struct ib_umad_port *port) 1000 { 1001 int devnum; 1002 dev_t base; 1003 1004 spin_lock(&port_lock); 1005 devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS); 1006 if (devnum >= IB_UMAD_MAX_PORTS) { 1007 spin_unlock(&port_lock); 1008 devnum = find_overflow_devnum(); 1009 if (devnum < 0) 1010 return -1; 1011 1012 spin_lock(&port_lock); 1013 port->dev_num = devnum + IB_UMAD_MAX_PORTS; 1014 base = devnum + overflow_maj; 1015 set_bit(devnum, overflow_map); 1016 } else { 1017 port->dev_num = devnum; 1018 base = devnum + base_dev; 1019 set_bit(devnum, dev_map); 1020 } 1021 spin_unlock(&port_lock); 1022 1023 port->ib_dev = device; 1024 port->port_num = port_num; 1025 sema_init(&port->sm_sem, 1); 1026 mutex_init(&port->file_mutex); 1027 INIT_LIST_HEAD(&port->file_list); 1028 1029 cdev_init(&port->cdev, &umad_fops); 1030 port->cdev.owner = THIS_MODULE; 1031 kobject_set_name(&port->cdev.kobj, "umad%d", port->dev_num); 1032 if (cdev_add(&port->cdev, base, 1)) 1033 goto err_cdev; 1034 1035 port->dev = device_create(umad_class, device->dma_device, 1036 port->cdev.dev, port, 1037 "umad%d", port->dev_num); 1038 if (IS_ERR(port->dev)) 1039 goto err_cdev; 1040 1041 if (device_create_file(port->dev, &dev_attr_ibdev)) 1042 goto err_dev; 1043 if (device_create_file(port->dev, &dev_attr_port)) 1044 goto err_dev; 1045 1046 base += IB_UMAD_MAX_PORTS; 1047 cdev_init(&port->sm_cdev, &umad_sm_fops); 1048 port->sm_cdev.owner = THIS_MODULE; 1049 kobject_set_name(&port->sm_cdev.kobj, "issm%d", port->dev_num); 1050 if (cdev_add(&port->sm_cdev, base, 1)) 1051 goto err_sm_cdev; 1052 1053 port->sm_dev = device_create(umad_class, device->dma_device, 1054 port->sm_cdev.dev, port, 1055 "issm%d", port->dev_num); 1056 if (IS_ERR(port->sm_dev)) 1057 goto err_sm_cdev; 1058 1059 if (device_create_file(port->sm_dev, &dev_attr_ibdev)) 1060 goto err_sm_dev; 1061 if (device_create_file(port->sm_dev, &dev_attr_port)) 1062 goto err_sm_dev; 1063 1064 return 0; 1065 1066 err_sm_dev: 1067 device_destroy(umad_class, port->sm_cdev.dev); 1068 1069 err_sm_cdev: 1070 cdev_del(&port->sm_cdev); 1071 1072 err_dev: 1073 device_destroy(umad_class, port->cdev.dev); 1074 1075 err_cdev: 1076 cdev_del(&port->cdev); 1077 if (port->dev_num < IB_UMAD_MAX_PORTS) 1078 clear_bit(devnum, dev_map); 1079 else 1080 clear_bit(devnum, overflow_map); 1081 1082 return -1; 1083 } 1084 1085 static void ib_umad_kill_port(struct ib_umad_port *port) 1086 { 1087 struct ib_umad_file *file; 1088 int id; 1089 1090 dev_set_drvdata(port->dev, NULL); 1091 dev_set_drvdata(port->sm_dev, NULL); 1092 1093 device_destroy(umad_class, port->cdev.dev); 1094 device_destroy(umad_class, port->sm_cdev.dev); 1095 1096 cdev_del(&port->cdev); 1097 cdev_del(&port->sm_cdev); 1098 1099 mutex_lock(&port->file_mutex); 1100 1101 port->ib_dev = NULL; 1102 1103 list_for_each_entry(file, &port->file_list, port_list) { 1104 mutex_lock(&file->mutex); 1105 file->agents_dead = 1; 1106 mutex_unlock(&file->mutex); 1107 1108 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id) 1109 if (file->agent[id]) 1110 ib_unregister_mad_agent(file->agent[id]); 1111 } 1112 1113 mutex_unlock(&port->file_mutex); 1114 1115 if (port->dev_num < IB_UMAD_MAX_PORTS) 1116 clear_bit(port->dev_num, dev_map); 1117 else 1118 clear_bit(port->dev_num - IB_UMAD_MAX_PORTS, overflow_map); 1119 } 1120 1121 static void ib_umad_add_one(struct ib_device *device) 1122 { 1123 struct ib_umad_device *umad_dev; 1124 int s, e, i; 1125 1126 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 1127 return; 1128 1129 if (device->node_type == RDMA_NODE_IB_SWITCH) 1130 s = e = 0; 1131 else { 1132 s = 1; 1133 e = device->phys_port_cnt; 1134 } 1135 1136 umad_dev = kzalloc(sizeof *umad_dev + 1137 (e - s + 1) * sizeof (struct ib_umad_port), 1138 GFP_KERNEL); 1139 if (!umad_dev) 1140 return; 1141 1142 kref_init(&umad_dev->ref); 1143 1144 umad_dev->start_port = s; 1145 umad_dev->end_port = e; 1146 1147 for (i = s; i <= e; ++i) { 1148 umad_dev->port[i - s].umad_dev = umad_dev; 1149 1150 if (ib_umad_init_port(device, i, &umad_dev->port[i - s])) 1151 goto err; 1152 } 1153 1154 ib_set_client_data(device, &umad_client, umad_dev); 1155 1156 return; 1157 1158 err: 1159 while (--i >= s) 1160 ib_umad_kill_port(&umad_dev->port[i - s]); 1161 1162 kref_put(&umad_dev->ref, ib_umad_release_dev); 1163 } 1164 1165 static void ib_umad_remove_one(struct ib_device *device) 1166 { 1167 struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client); 1168 int i; 1169 1170 if (!umad_dev) 1171 return; 1172 1173 for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i) 1174 ib_umad_kill_port(&umad_dev->port[i]); 1175 1176 kref_put(&umad_dev->ref, ib_umad_release_dev); 1177 } 1178 1179 static char *umad_devnode(struct device *dev, mode_t *mode) 1180 { 1181 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 1182 } 1183 1184 static int __init ib_umad_init(void) 1185 { 1186 int ret; 1187 1188 ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2, 1189 "infiniband_mad"); 1190 if (ret) { 1191 printk(KERN_ERR "user_mad: couldn't register device number\n"); 1192 goto out; 1193 } 1194 1195 umad_class = class_create(THIS_MODULE, "infiniband_mad"); 1196 if (IS_ERR(umad_class)) { 1197 ret = PTR_ERR(umad_class); 1198 printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n"); 1199 goto out_chrdev; 1200 } 1201 1202 umad_class->devnode = umad_devnode; 1203 1204 ret = class_create_file(umad_class, &class_attr_abi_version.attr); 1205 if (ret) { 1206 printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n"); 1207 goto out_class; 1208 } 1209 1210 ret = ib_register_client(&umad_client); 1211 if (ret) { 1212 printk(KERN_ERR "user_mad: couldn't register ib_umad client\n"); 1213 goto out_class; 1214 } 1215 1216 return 0; 1217 1218 out_class: 1219 class_destroy(umad_class); 1220 1221 out_chrdev: 1222 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2); 1223 1224 out: 1225 return ret; 1226 } 1227 1228 static void __exit ib_umad_cleanup(void) 1229 { 1230 ib_unregister_client(&umad_client); 1231 class_destroy(umad_class); 1232 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2); 1233 if (overflow_maj) 1234 unregister_chrdev_region(overflow_maj, IB_UMAD_MAX_PORTS * 2); 1235 } 1236 1237 module_init(ib_umad_init); 1238 module_exit(ib_umad_cleanup); 1239