1517 lines · c
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 two8 * licenses. You may choose to be licensed under the terms of the GNU9 * General Public License (GPL) Version 2, available from the file10 * COPYING in the main directory of this source tree, or the11 * OpenIB.org BSD license below:12 *13 * Redistribution and use in source and binary forms, with or14 * without modification, are permitted provided that the following15 * conditions are met:16 *17 * - Redistributions of source code must retain the above18 * copyright notice, this list of conditions and the following19 * disclaimer.20 *21 * - Redistributions in binary form must reproduce the above22 * copyright notice, this list of conditions and the following23 * disclaimer in the documentation and/or other materials24 * 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 OF28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE33 * SOFTWARE.34 */35 36#define pr_fmt(fmt) "user_mad: " fmt37 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 62MODULE_AUTHOR("Roland Dreier");63MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");64MODULE_LICENSE("Dual BSD/GPL");65 66#define MAX_UMAD_RECV_LIST_SIZE 20000067 68enum {69 IB_UMAD_MAX_PORTS = RDMA_MAX_PORTS,70 IB_UMAD_MAX_AGENTS = 32,71 72 IB_UMAD_MAJOR = 231,73 IB_UMAD_MINOR_BASE = 0,74 IB_UMAD_NUM_FIXED_MINOR = 64,75 IB_UMAD_NUM_DYNAMIC_MINOR = IB_UMAD_MAX_PORTS - IB_UMAD_NUM_FIXED_MINOR,76 IB_ISSM_MINOR_BASE = IB_UMAD_NUM_FIXED_MINOR,77};78 79/*80 * Our lifetime rules for these structs are the following:81 * device special file is opened, we take a reference on the82 * ib_umad_port's struct ib_umad_device. We drop these83 * references in the corresponding close().84 *85 * In addition to references coming from open character devices, there86 * is one more reference to each ib_umad_device representing the87 * module's reference taken when allocating the ib_umad_device in88 * ib_umad_add_one().89 *90 * When destroying an ib_umad_device, we drop the module's reference.91 */92 93struct ib_umad_port {94 struct cdev cdev;95 struct device dev;96 struct cdev sm_cdev;97 struct device sm_dev;98 struct semaphore sm_sem;99 100 struct mutex file_mutex;101 struct list_head file_list;102 103 struct ib_device *ib_dev;104 struct ib_umad_device *umad_dev;105 int dev_num;106 u32 port_num;107};108 109struct ib_umad_device {110 struct kref kref;111 struct ib_umad_port ports[];112};113 114struct ib_umad_file {115 struct mutex mutex;116 struct ib_umad_port *port;117 struct list_head recv_list;118 atomic_t recv_list_size;119 struct list_head send_list;120 struct list_head port_list;121 spinlock_t send_lock;122 wait_queue_head_t recv_wait;123 struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS];124 int agents_dead;125 u8 use_pkey_index;126 u8 already_used;127};128 129struct ib_umad_packet {130 struct ib_mad_send_buf *msg;131 struct ib_mad_recv_wc *recv_wc;132 struct list_head list;133 int length;134 struct ib_user_mad mad;135};136 137struct ib_rmpp_mad_hdr {138 struct ib_mad_hdr mad_hdr;139 struct ib_rmpp_hdr rmpp_hdr;140} __packed;141 142#define CREATE_TRACE_POINTS143#include <trace/events/ib_umad.h>144 145static const dev_t base_umad_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);146static const dev_t base_issm_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE) +147 IB_UMAD_NUM_FIXED_MINOR;148static dev_t dynamic_umad_dev;149static dev_t dynamic_issm_dev;150 151static DEFINE_IDA(umad_ida);152 153static int ib_umad_add_one(struct ib_device *device);154static void ib_umad_remove_one(struct ib_device *device, void *client_data);155 156static void ib_umad_dev_free(struct kref *kref)157{158 struct ib_umad_device *dev =159 container_of(kref, struct ib_umad_device, kref);160 161 kfree(dev);162}163 164static void ib_umad_dev_get(struct ib_umad_device *dev)165{166 kref_get(&dev->kref);167}168 169static void ib_umad_dev_put(struct ib_umad_device *dev)170{171 kref_put(&dev->kref, ib_umad_dev_free);172}173 174static int hdr_size(struct ib_umad_file *file)175{176 return file->use_pkey_index ? sizeof(struct ib_user_mad_hdr) :177 sizeof(struct ib_user_mad_hdr_old);178}179 180/* caller must hold file->mutex */181static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)182{183 return file->agents_dead ? NULL : file->agent[id];184}185 186static int queue_packet(struct ib_umad_file *file, struct ib_mad_agent *agent,187 struct ib_umad_packet *packet, bool is_recv_mad)188{189 int ret = 1;190 191 mutex_lock(&file->mutex);192 193 if (is_recv_mad &&194 atomic_read(&file->recv_list_size) > MAX_UMAD_RECV_LIST_SIZE)195 goto unlock;196 197 for (packet->mad.hdr.id = 0;198 packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;199 packet->mad.hdr.id++)200 if (agent == __get_agent(file, packet->mad.hdr.id)) {201 list_add_tail(&packet->list, &file->recv_list);202 atomic_inc(&file->recv_list_size);203 wake_up_interruptible(&file->recv_wait);204 ret = 0;205 break;206 }207unlock:208 mutex_unlock(&file->mutex);209 210 return ret;211}212 213static void dequeue_send(struct ib_umad_file *file,214 struct ib_umad_packet *packet)215{216 spin_lock_irq(&file->send_lock);217 list_del(&packet->list);218 spin_unlock_irq(&file->send_lock);219}220 221static void send_handler(struct ib_mad_agent *agent,222 struct ib_mad_send_wc *send_wc)223{224 struct ib_umad_file *file = agent->context;225 struct ib_umad_packet *packet = send_wc->send_buf->context[0];226 227 dequeue_send(file, packet);228 rdma_destroy_ah(packet->msg->ah, RDMA_DESTROY_AH_SLEEPABLE);229 ib_free_send_mad(packet->msg);230 231 if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {232 packet->length = IB_MGMT_MAD_HDR;233 packet->mad.hdr.status = ETIMEDOUT;234 if (!queue_packet(file, agent, packet, false))235 return;236 }237 kfree(packet);238}239 240static void recv_handler(struct ib_mad_agent *agent,241 struct ib_mad_send_buf *send_buf,242 struct ib_mad_recv_wc *mad_recv_wc)243{244 struct ib_umad_file *file = agent->context;245 struct ib_umad_packet *packet;246 247 if (mad_recv_wc->wc->status != IB_WC_SUCCESS)248 goto err1;249 250 packet = kzalloc(sizeof *packet, GFP_KERNEL);251 if (!packet)252 goto err1;253 254 packet->length = mad_recv_wc->mad_len;255 packet->recv_wc = mad_recv_wc;256 257 packet->mad.hdr.status = 0;258 packet->mad.hdr.length = hdr_size(file) + mad_recv_wc->mad_len;259 packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp);260 /*261 * On OPA devices it is okay to lose the upper 16 bits of LID as this262 * information is obtained elsewhere. Mask off the upper 16 bits.263 */264 if (rdma_cap_opa_mad(agent->device, agent->port_num))265 packet->mad.hdr.lid = ib_lid_be16(0xFFFF &266 mad_recv_wc->wc->slid);267 else268 packet->mad.hdr.lid = ib_lid_be16(mad_recv_wc->wc->slid);269 packet->mad.hdr.sl = mad_recv_wc->wc->sl;270 packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits;271 packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;272 packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);273 if (packet->mad.hdr.grh_present) {274 struct rdma_ah_attr ah_attr;275 const struct ib_global_route *grh;276 int ret;277 278 ret = ib_init_ah_attr_from_wc(agent->device, agent->port_num,279 mad_recv_wc->wc,280 mad_recv_wc->recv_buf.grh,281 &ah_attr);282 if (ret)283 goto err2;284 285 grh = rdma_ah_read_grh(&ah_attr);286 packet->mad.hdr.gid_index = grh->sgid_index;287 packet->mad.hdr.hop_limit = grh->hop_limit;288 packet->mad.hdr.traffic_class = grh->traffic_class;289 memcpy(packet->mad.hdr.gid, &grh->dgid, 16);290 packet->mad.hdr.flow_label = cpu_to_be32(grh->flow_label);291 rdma_destroy_ah_attr(&ah_attr);292 }293 294 if (queue_packet(file, agent, packet, true))295 goto err2;296 return;297 298err2:299 kfree(packet);300err1:301 ib_free_recv_mad(mad_recv_wc);302}303 304static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,305 struct ib_umad_packet *packet, size_t count)306{307 struct ib_mad_recv_buf *recv_buf;308 int left, seg_payload, offset, max_seg_payload;309 size_t seg_size;310 311 recv_buf = &packet->recv_wc->recv_buf;312 seg_size = packet->recv_wc->mad_seg_size;313 314 /* We need enough room to copy the first (or only) MAD segment. */315 if ((packet->length <= seg_size &&316 count < hdr_size(file) + packet->length) ||317 (packet->length > seg_size &&318 count < hdr_size(file) + seg_size))319 return -EINVAL;320 321 if (copy_to_user(buf, &packet->mad, hdr_size(file)))322 return -EFAULT;323 324 buf += hdr_size(file);325 seg_payload = min_t(int, packet->length, seg_size);326 if (copy_to_user(buf, recv_buf->mad, seg_payload))327 return -EFAULT;328 329 if (seg_payload < packet->length) {330 /*331 * Multipacket RMPP MAD message. Copy remainder of message.332 * Note that last segment may have a shorter payload.333 */334 if (count < hdr_size(file) + packet->length) {335 /*336 * The buffer is too small, return the first RMPP segment,337 * which includes the RMPP message length.338 */339 return -ENOSPC;340 }341 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);342 max_seg_payload = seg_size - offset;343 344 for (left = packet->length - seg_payload, buf += seg_payload;345 left; left -= seg_payload, buf += seg_payload) {346 recv_buf = container_of(recv_buf->list.next,347 struct ib_mad_recv_buf, list);348 seg_payload = min(left, max_seg_payload);349 if (copy_to_user(buf, ((void *) recv_buf->mad) + offset,350 seg_payload))351 return -EFAULT;352 }353 }354 355 trace_ib_umad_read_recv(file, &packet->mad.hdr, &recv_buf->mad->mad_hdr);356 357 return hdr_size(file) + packet->length;358}359 360static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,361 struct ib_umad_packet *packet, size_t count)362{363 ssize_t size = hdr_size(file) + packet->length;364 365 if (count < size)366 return -EINVAL;367 368 if (copy_to_user(buf, &packet->mad, hdr_size(file)))369 return -EFAULT;370 371 buf += hdr_size(file);372 373 if (copy_to_user(buf, packet->mad.data, packet->length))374 return -EFAULT;375 376 trace_ib_umad_read_send(file, &packet->mad.hdr,377 (struct ib_mad_hdr *)&packet->mad.data);378 379 return size;380}381 382static ssize_t ib_umad_read(struct file *filp, char __user *buf,383 size_t count, loff_t *pos)384{385 struct ib_umad_file *file = filp->private_data;386 struct ib_umad_packet *packet;387 ssize_t ret;388 389 if (count < hdr_size(file))390 return -EINVAL;391 392 mutex_lock(&file->mutex);393 394 if (file->agents_dead) {395 mutex_unlock(&file->mutex);396 return -EIO;397 }398 399 while (list_empty(&file->recv_list)) {400 mutex_unlock(&file->mutex);401 402 if (filp->f_flags & O_NONBLOCK)403 return -EAGAIN;404 405 if (wait_event_interruptible(file->recv_wait,406 !list_empty(&file->recv_list)))407 return -ERESTARTSYS;408 409 mutex_lock(&file->mutex);410 }411 412 if (file->agents_dead) {413 mutex_unlock(&file->mutex);414 return -EIO;415 }416 417 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);418 list_del(&packet->list);419 atomic_dec(&file->recv_list_size);420 421 mutex_unlock(&file->mutex);422 423 if (packet->recv_wc)424 ret = copy_recv_mad(file, buf, packet, count);425 else426 ret = copy_send_mad(file, buf, packet, count);427 428 if (ret < 0) {429 /* Requeue packet */430 mutex_lock(&file->mutex);431 list_add(&packet->list, &file->recv_list);432 atomic_inc(&file->recv_list_size);433 mutex_unlock(&file->mutex);434 } else {435 if (packet->recv_wc)436 ib_free_recv_mad(packet->recv_wc);437 kfree(packet);438 }439 return ret;440}441 442static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)443{444 int left, seg;445 446 /* Copy class specific header */447 if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&448 copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,449 msg->hdr_len - IB_MGMT_RMPP_HDR))450 return -EFAULT;451 452 /* All headers are in place. Copy data segments. */453 for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;454 seg++, left -= msg->seg_size, buf += msg->seg_size) {455 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,456 min(left, msg->seg_size)))457 return -EFAULT;458 }459 return 0;460}461 462static int same_destination(struct ib_user_mad_hdr *hdr1,463 struct ib_user_mad_hdr *hdr2)464{465 if (!hdr1->grh_present && !hdr2->grh_present)466 return (hdr1->lid == hdr2->lid);467 468 if (hdr1->grh_present && hdr2->grh_present)469 return !memcmp(hdr1->gid, hdr2->gid, 16);470 471 return 0;472}473 474static int is_duplicate(struct ib_umad_file *file,475 struct ib_umad_packet *packet)476{477 struct ib_umad_packet *sent_packet;478 struct ib_mad_hdr *sent_hdr, *hdr;479 480 hdr = (struct ib_mad_hdr *) packet->mad.data;481 list_for_each_entry(sent_packet, &file->send_list, list) {482 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;483 484 if ((hdr->tid != sent_hdr->tid) ||485 (hdr->mgmt_class != sent_hdr->mgmt_class))486 continue;487 488 /*489 * No need to be overly clever here. If two new operations have490 * the same TID, reject the second as a duplicate. This is more491 * restrictive than required by the spec.492 */493 if (!ib_response_mad(hdr)) {494 if (!ib_response_mad(sent_hdr))495 return 1;496 continue;497 } else if (!ib_response_mad(sent_hdr))498 continue;499 500 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))501 return 1;502 }503 504 return 0;505}506 507static ssize_t ib_umad_write(struct file *filp, const char __user *buf,508 size_t count, loff_t *pos)509{510 struct ib_umad_file *file = filp->private_data;511 struct ib_rmpp_mad_hdr *rmpp_mad_hdr;512 struct ib_umad_packet *packet;513 struct ib_mad_agent *agent;514 struct rdma_ah_attr ah_attr;515 struct ib_ah *ah;516 __be64 *tid;517 int ret, data_len, hdr_len, copy_offset, rmpp_active;518 u8 base_version;519 520 if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)521 return -EINVAL;522 523 packet = kzalloc(sizeof(*packet) + IB_MGMT_RMPP_HDR, GFP_KERNEL);524 if (!packet)525 return -ENOMEM;526 527 if (copy_from_user(&packet->mad, buf, hdr_size(file))) {528 ret = -EFAULT;529 goto err;530 }531 532 if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {533 ret = -EINVAL;534 goto err;535 }536 537 buf += hdr_size(file);538 539 if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {540 ret = -EFAULT;541 goto err;542 }543 544 mutex_lock(&file->mutex);545 546 trace_ib_umad_write(file, &packet->mad.hdr,547 (struct ib_mad_hdr *)&packet->mad.data);548 549 agent = __get_agent(file, packet->mad.hdr.id);550 if (!agent) {551 ret = -EIO;552 goto err_up;553 }554 555 memset(&ah_attr, 0, sizeof ah_attr);556 ah_attr.type = rdma_ah_find_type(agent->device,557 file->port->port_num);558 rdma_ah_set_dlid(&ah_attr, be16_to_cpu(packet->mad.hdr.lid));559 rdma_ah_set_sl(&ah_attr, packet->mad.hdr.sl);560 rdma_ah_set_path_bits(&ah_attr, packet->mad.hdr.path_bits);561 rdma_ah_set_port_num(&ah_attr, file->port->port_num);562 if (packet->mad.hdr.grh_present) {563 rdma_ah_set_grh(&ah_attr, NULL,564 be32_to_cpu(packet->mad.hdr.flow_label),565 packet->mad.hdr.gid_index,566 packet->mad.hdr.hop_limit,567 packet->mad.hdr.traffic_class);568 rdma_ah_set_dgid_raw(&ah_attr, packet->mad.hdr.gid);569 }570 571 ah = rdma_create_user_ah(agent->qp->pd, &ah_attr, NULL);572 if (IS_ERR(ah)) {573 ret = PTR_ERR(ah);574 goto err_up;575 }576 577 rmpp_mad_hdr = (struct ib_rmpp_mad_hdr *)packet->mad.data;578 hdr_len = ib_get_mad_data_offset(rmpp_mad_hdr->mad_hdr.mgmt_class);579 580 if (ib_is_mad_class_rmpp(rmpp_mad_hdr->mad_hdr.mgmt_class)581 && ib_mad_kernel_rmpp_agent(agent)) {582 copy_offset = IB_MGMT_RMPP_HDR;583 rmpp_active = ib_get_rmpp_flags(&rmpp_mad_hdr->rmpp_hdr) &584 IB_MGMT_RMPP_FLAG_ACTIVE;585 } else {586 copy_offset = IB_MGMT_MAD_HDR;587 rmpp_active = 0;588 }589 590 base_version = ((struct ib_mad_hdr *)&packet->mad.data)->base_version;591 data_len = count - hdr_size(file) - hdr_len;592 packet->msg = ib_create_send_mad(agent,593 be32_to_cpu(packet->mad.hdr.qpn),594 packet->mad.hdr.pkey_index, rmpp_active,595 hdr_len, data_len, GFP_KERNEL,596 base_version);597 if (IS_ERR(packet->msg)) {598 ret = PTR_ERR(packet->msg);599 goto err_ah;600 }601 602 packet->msg->ah = ah;603 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;604 packet->msg->retries = packet->mad.hdr.retries;605 packet->msg->context[0] = packet;606 607 /* Copy MAD header. Any RMPP header is already in place. */608 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);609 610 if (!rmpp_active) {611 if (copy_from_user(packet->msg->mad + copy_offset,612 buf + copy_offset,613 hdr_len + data_len - copy_offset)) {614 ret = -EFAULT;615 goto err_msg;616 }617 } else {618 ret = copy_rmpp_mad(packet->msg, buf);619 if (ret)620 goto err_msg;621 }622 623 /*624 * Set the high-order part of the transaction ID to make MADs from625 * different agents unique, and allow routing responses back to the626 * original requestor.627 */628 if (!ib_response_mad(packet->msg->mad)) {629 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;630 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |631 (be64_to_cpup(tid) & 0xffffffff));632 rmpp_mad_hdr->mad_hdr.tid = *tid;633 }634 635 if (!ib_mad_kernel_rmpp_agent(agent)636 && ib_is_mad_class_rmpp(rmpp_mad_hdr->mad_hdr.mgmt_class)637 && (ib_get_rmpp_flags(&rmpp_mad_hdr->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE)) {638 spin_lock_irq(&file->send_lock);639 list_add_tail(&packet->list, &file->send_list);640 spin_unlock_irq(&file->send_lock);641 } else {642 spin_lock_irq(&file->send_lock);643 ret = is_duplicate(file, packet);644 if (!ret)645 list_add_tail(&packet->list, &file->send_list);646 spin_unlock_irq(&file->send_lock);647 if (ret) {648 ret = -EINVAL;649 goto err_msg;650 }651 }652 653 ret = ib_post_send_mad(packet->msg, NULL);654 if (ret)655 goto err_send;656 657 mutex_unlock(&file->mutex);658 return count;659 660err_send:661 dequeue_send(file, packet);662err_msg:663 ib_free_send_mad(packet->msg);664err_ah:665 rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);666err_up:667 mutex_unlock(&file->mutex);668err:669 kfree(packet);670 return ret;671}672 673static __poll_t ib_umad_poll(struct file *filp, struct poll_table_struct *wait)674{675 struct ib_umad_file *file = filp->private_data;676 677 /* we will always be able to post a MAD send */678 __poll_t mask = EPOLLOUT | EPOLLWRNORM;679 680 mutex_lock(&file->mutex);681 poll_wait(filp, &file->recv_wait, wait);682 683 if (!list_empty(&file->recv_list))684 mask |= EPOLLIN | EPOLLRDNORM;685 if (file->agents_dead)686 mask = EPOLLERR;687 mutex_unlock(&file->mutex);688 689 return mask;690}691 692static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,693 int compat_method_mask)694{695 struct ib_user_mad_reg_req ureq;696 struct ib_mad_reg_req req;697 struct ib_mad_agent *agent = NULL;698 int agent_id;699 int ret;700 701 mutex_lock(&file->port->file_mutex);702 mutex_lock(&file->mutex);703 704 if (!file->port->ib_dev) {705 dev_notice(&file->port->dev, "%s: invalid device\n", __func__);706 ret = -EPIPE;707 goto out;708 }709 710 if (copy_from_user(&ureq, arg, sizeof ureq)) {711 ret = -EFAULT;712 goto out;713 }714 715 if (ureq.qpn != 0 && ureq.qpn != 1) {716 dev_notice(&file->port->dev,717 "%s: invalid QPN %u specified\n", __func__,718 ureq.qpn);719 ret = -EINVAL;720 goto out;721 }722 723 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)724 if (!__get_agent(file, agent_id))725 goto found;726 727 dev_notice(&file->port->dev, "%s: Max Agents (%u) reached\n", __func__,728 IB_UMAD_MAX_AGENTS);729 730 ret = -ENOMEM;731 goto out;732 733found:734 if (ureq.mgmt_class) {735 memset(&req, 0, sizeof(req));736 req.mgmt_class = ureq.mgmt_class;737 req.mgmt_class_version = ureq.mgmt_class_version;738 memcpy(req.oui, ureq.oui, sizeof req.oui);739 740 if (compat_method_mask) {741 u32 *umm = (u32 *) ureq.method_mask;742 int i;743 744 for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)745 req.method_mask[i] =746 umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);747 } else748 memcpy(req.method_mask, ureq.method_mask,749 sizeof req.method_mask);750 }751 752 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,753 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,754 ureq.mgmt_class ? &req : NULL,755 ureq.rmpp_version,756 send_handler, recv_handler, file, 0);757 if (IS_ERR(agent)) {758 ret = PTR_ERR(agent);759 agent = NULL;760 goto out;761 }762 763 if (put_user(agent_id,764 (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {765 ret = -EFAULT;766 goto out;767 }768 769 if (!file->already_used) {770 file->already_used = 1;771 if (!file->use_pkey_index) {772 dev_warn(&file->port->dev,773 "process %s did not enable P_Key index support.\n",774 current->comm);775 dev_warn(&file->port->dev,776 " Documentation/infiniband/user_mad.rst has info on the new ABI.\n");777 }778 }779 780 file->agent[agent_id] = agent;781 ret = 0;782 783out:784 mutex_unlock(&file->mutex);785 786 if (ret && agent)787 ib_unregister_mad_agent(agent);788 789 mutex_unlock(&file->port->file_mutex);790 791 return ret;792}793 794static int ib_umad_reg_agent2(struct ib_umad_file *file, void __user *arg)795{796 struct ib_user_mad_reg_req2 ureq;797 struct ib_mad_reg_req req;798 struct ib_mad_agent *agent = NULL;799 int agent_id;800 int ret;801 802 mutex_lock(&file->port->file_mutex);803 mutex_lock(&file->mutex);804 805 if (!file->port->ib_dev) {806 dev_notice(&file->port->dev, "%s: invalid device\n", __func__);807 ret = -EPIPE;808 goto out;809 }810 811 if (copy_from_user(&ureq, arg, sizeof(ureq))) {812 ret = -EFAULT;813 goto out;814 }815 816 if (ureq.qpn != 0 && ureq.qpn != 1) {817 dev_notice(&file->port->dev, "%s: invalid QPN %u specified\n",818 __func__, ureq.qpn);819 ret = -EINVAL;820 goto out;821 }822 823 if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) {824 dev_notice(&file->port->dev,825 "%s failed: invalid registration flags specified 0x%x; supported 0x%x\n",826 __func__, ureq.flags, IB_USER_MAD_REG_FLAGS_CAP);827 ret = -EINVAL;828 829 if (put_user((u32)IB_USER_MAD_REG_FLAGS_CAP,830 (u32 __user *) (arg + offsetof(struct831 ib_user_mad_reg_req2, flags))))832 ret = -EFAULT;833 834 goto out;835 }836 837 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)838 if (!__get_agent(file, agent_id))839 goto found;840 841 dev_notice(&file->port->dev, "%s: Max Agents (%u) reached\n", __func__,842 IB_UMAD_MAX_AGENTS);843 ret = -ENOMEM;844 goto out;845 846found:847 if (ureq.mgmt_class) {848 memset(&req, 0, sizeof(req));849 req.mgmt_class = ureq.mgmt_class;850 req.mgmt_class_version = ureq.mgmt_class_version;851 if (ureq.oui & 0xff000000) {852 dev_notice(&file->port->dev,853 "%s failed: oui invalid 0x%08x\n", __func__,854 ureq.oui);855 ret = -EINVAL;856 goto out;857 }858 req.oui[2] = ureq.oui & 0x0000ff;859 req.oui[1] = (ureq.oui & 0x00ff00) >> 8;860 req.oui[0] = (ureq.oui & 0xff0000) >> 16;861 memcpy(req.method_mask, ureq.method_mask,862 sizeof(req.method_mask));863 }864 865 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,866 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,867 ureq.mgmt_class ? &req : NULL,868 ureq.rmpp_version,869 send_handler, recv_handler, file,870 ureq.flags);871 if (IS_ERR(agent)) {872 ret = PTR_ERR(agent);873 agent = NULL;874 goto out;875 }876 877 if (put_user(agent_id,878 (u32 __user *)(arg +879 offsetof(struct ib_user_mad_reg_req2, id)))) {880 ret = -EFAULT;881 goto out;882 }883 884 if (!file->already_used) {885 file->already_used = 1;886 file->use_pkey_index = 1;887 }888 889 file->agent[agent_id] = agent;890 ret = 0;891 892out:893 mutex_unlock(&file->mutex);894 895 if (ret && agent)896 ib_unregister_mad_agent(agent);897 898 mutex_unlock(&file->port->file_mutex);899 900 return ret;901}902 903 904static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)905{906 struct ib_mad_agent *agent = NULL;907 u32 id;908 int ret = 0;909 910 if (get_user(id, arg))911 return -EFAULT;912 if (id >= IB_UMAD_MAX_AGENTS)913 return -EINVAL;914 915 mutex_lock(&file->port->file_mutex);916 mutex_lock(&file->mutex);917 918 id = array_index_nospec(id, IB_UMAD_MAX_AGENTS);919 if (!__get_agent(file, id)) {920 ret = -EINVAL;921 goto out;922 }923 924 agent = file->agent[id];925 file->agent[id] = NULL;926 927out:928 mutex_unlock(&file->mutex);929 930 if (agent)931 ib_unregister_mad_agent(agent);932 933 mutex_unlock(&file->port->file_mutex);934 935 return ret;936}937 938static long ib_umad_enable_pkey(struct ib_umad_file *file)939{940 int ret = 0;941 942 mutex_lock(&file->mutex);943 if (file->already_used)944 ret = -EINVAL;945 else946 file->use_pkey_index = 1;947 mutex_unlock(&file->mutex);948 949 return ret;950}951 952static long ib_umad_ioctl(struct file *filp, unsigned int cmd,953 unsigned long arg)954{955 switch (cmd) {956 case IB_USER_MAD_REGISTER_AGENT:957 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);958 case IB_USER_MAD_UNREGISTER_AGENT:959 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);960 case IB_USER_MAD_ENABLE_PKEY:961 return ib_umad_enable_pkey(filp->private_data);962 case IB_USER_MAD_REGISTER_AGENT2:963 return ib_umad_reg_agent2(filp->private_data, (void __user *) arg);964 default:965 return -ENOIOCTLCMD;966 }967}968 969#ifdef CONFIG_COMPAT970static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,971 unsigned long arg)972{973 switch (cmd) {974 case IB_USER_MAD_REGISTER_AGENT:975 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);976 case IB_USER_MAD_UNREGISTER_AGENT:977 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));978 case IB_USER_MAD_ENABLE_PKEY:979 return ib_umad_enable_pkey(filp->private_data);980 case IB_USER_MAD_REGISTER_AGENT2:981 return ib_umad_reg_agent2(filp->private_data, compat_ptr(arg));982 default:983 return -ENOIOCTLCMD;984 }985}986#endif987 988/*989 * ib_umad_open() does not need the BKL:990 *991 * - the ib_umad_port structures are properly reference counted, and992 * everything else is purely local to the file being created, so993 * races against other open calls are not a problem;994 * - the ioctl method does not affect any global state outside of the995 * file structure being operated on;996 */997static int ib_umad_open(struct inode *inode, struct file *filp)998{999 struct ib_umad_port *port;1000 struct ib_umad_file *file;1001 int ret = 0;1002 1003 port = container_of(inode->i_cdev, struct ib_umad_port, cdev);1004 1005 mutex_lock(&port->file_mutex);1006 1007 if (!port->ib_dev) {1008 ret = -ENXIO;1009 goto out;1010 }1011 1012 if (!rdma_dev_access_netns(port->ib_dev, current->nsproxy->net_ns)) {1013 ret = -EPERM;1014 goto out;1015 }1016 1017 file = kzalloc(sizeof(*file), GFP_KERNEL);1018 if (!file) {1019 ret = -ENOMEM;1020 goto out;1021 }1022 1023 mutex_init(&file->mutex);1024 spin_lock_init(&file->send_lock);1025 INIT_LIST_HEAD(&file->recv_list);1026 INIT_LIST_HEAD(&file->send_list);1027 init_waitqueue_head(&file->recv_wait);1028 1029 file->port = port;1030 filp->private_data = file;1031 1032 list_add_tail(&file->port_list, &port->file_list);1033 1034 stream_open(inode, filp);1035out:1036 mutex_unlock(&port->file_mutex);1037 return ret;1038}1039 1040static int ib_umad_close(struct inode *inode, struct file *filp)1041{1042 struct ib_umad_file *file = filp->private_data;1043 struct ib_umad_packet *packet, *tmp;1044 int already_dead;1045 int i;1046 1047 mutex_lock(&file->port->file_mutex);1048 mutex_lock(&file->mutex);1049 1050 already_dead = file->agents_dead;1051 file->agents_dead = 1;1052 1053 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {1054 if (packet->recv_wc)1055 ib_free_recv_mad(packet->recv_wc);1056 kfree(packet);1057 }1058 1059 list_del(&file->port_list);1060 1061 mutex_unlock(&file->mutex);1062 1063 if (!already_dead)1064 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)1065 if (file->agent[i])1066 ib_unregister_mad_agent(file->agent[i]);1067 1068 mutex_unlock(&file->port->file_mutex);1069 mutex_destroy(&file->mutex);1070 kfree(file);1071 return 0;1072}1073 1074static const struct file_operations umad_fops = {1075 .owner = THIS_MODULE,1076 .read = ib_umad_read,1077 .write = ib_umad_write,1078 .poll = ib_umad_poll,1079 .unlocked_ioctl = ib_umad_ioctl,1080#ifdef CONFIG_COMPAT1081 .compat_ioctl = ib_umad_compat_ioctl,1082#endif1083 .open = ib_umad_open,1084 .release = ib_umad_close,1085};1086 1087static int ib_umad_sm_open(struct inode *inode, struct file *filp)1088{1089 struct ib_umad_port *port;1090 struct ib_port_modify props = {1091 .set_port_cap_mask = IB_PORT_SM1092 };1093 int ret;1094 1095 port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev);1096 1097 if (filp->f_flags & O_NONBLOCK) {1098 if (down_trylock(&port->sm_sem)) {1099 ret = -EAGAIN;1100 goto fail;1101 }1102 } else {1103 if (down_interruptible(&port->sm_sem)) {1104 ret = -ERESTARTSYS;1105 goto fail;1106 }1107 }1108 1109 if (!rdma_dev_access_netns(port->ib_dev, current->nsproxy->net_ns)) {1110 ret = -EPERM;1111 goto err_up_sem;1112 }1113 1114 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);1115 if (ret)1116 goto err_up_sem;1117 1118 filp->private_data = port;1119 1120 nonseekable_open(inode, filp);1121 return 0;1122 1123err_up_sem:1124 up(&port->sm_sem);1125 1126fail:1127 return ret;1128}1129 1130static int ib_umad_sm_close(struct inode *inode, struct file *filp)1131{1132 struct ib_umad_port *port = filp->private_data;1133 struct ib_port_modify props = {1134 .clr_port_cap_mask = IB_PORT_SM1135 };1136 int ret = 0;1137 1138 mutex_lock(&port->file_mutex);1139 if (port->ib_dev)1140 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);1141 mutex_unlock(&port->file_mutex);1142 1143 up(&port->sm_sem);1144 1145 return ret;1146}1147 1148static const struct file_operations umad_sm_fops = {1149 .owner = THIS_MODULE,1150 .open = ib_umad_sm_open,1151 .release = ib_umad_sm_close,1152};1153 1154static struct ib_umad_port *get_port(struct ib_device *ibdev,1155 struct ib_umad_device *umad_dev,1156 u32 port)1157{1158 if (!umad_dev)1159 return ERR_PTR(-EOPNOTSUPP);1160 if (!rdma_is_port_valid(ibdev, port))1161 return ERR_PTR(-EINVAL);1162 if (!rdma_cap_ib_mad(ibdev, port))1163 return ERR_PTR(-EOPNOTSUPP);1164 1165 return &umad_dev->ports[port - rdma_start_port(ibdev)];1166}1167 1168static int ib_umad_get_nl_info(struct ib_device *ibdev, void *client_data,1169 struct ib_client_nl_info *res)1170{1171 struct ib_umad_port *port = get_port(ibdev, client_data, res->port);1172 1173 if (IS_ERR(port))1174 return PTR_ERR(port);1175 1176 res->abi = IB_USER_MAD_ABI_VERSION;1177 res->cdev = &port->dev;1178 return 0;1179}1180 1181static struct ib_client umad_client = {1182 .name = "umad",1183 .add = ib_umad_add_one,1184 .remove = ib_umad_remove_one,1185 .get_nl_info = ib_umad_get_nl_info,1186};1187MODULE_ALIAS_RDMA_CLIENT("umad");1188 1189static int ib_issm_get_nl_info(struct ib_device *ibdev, void *client_data,1190 struct ib_client_nl_info *res)1191{1192 struct ib_umad_port *port = get_port(ibdev, client_data, res->port);1193 1194 if (IS_ERR(port))1195 return PTR_ERR(port);1196 1197 res->abi = IB_USER_MAD_ABI_VERSION;1198 res->cdev = &port->sm_dev;1199 return 0;1200}1201 1202static struct ib_client issm_client = {1203 .name = "issm",1204 .get_nl_info = ib_issm_get_nl_info,1205};1206MODULE_ALIAS_RDMA_CLIENT("issm");1207 1208static ssize_t ibdev_show(struct device *dev, struct device_attribute *attr,1209 char *buf)1210{1211 struct ib_umad_port *port = dev_get_drvdata(dev);1212 1213 if (!port)1214 return -ENODEV;1215 1216 return sysfs_emit(buf, "%s\n", dev_name(&port->ib_dev->dev));1217}1218static DEVICE_ATTR_RO(ibdev);1219 1220static ssize_t port_show(struct device *dev, struct device_attribute *attr,1221 char *buf)1222{1223 struct ib_umad_port *port = dev_get_drvdata(dev);1224 1225 if (!port)1226 return -ENODEV;1227 1228 return sysfs_emit(buf, "%d\n", port->port_num);1229}1230static DEVICE_ATTR_RO(port);1231 1232static struct attribute *umad_class_dev_attrs[] = {1233 &dev_attr_ibdev.attr,1234 &dev_attr_port.attr,1235 NULL,1236};1237ATTRIBUTE_GROUPS(umad_class_dev);1238 1239static char *umad_devnode(const struct device *dev, umode_t *mode)1240{1241 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));1242}1243 1244static ssize_t abi_version_show(const struct class *class,1245 const struct class_attribute *attr, char *buf)1246{1247 return sysfs_emit(buf, "%d\n", IB_USER_MAD_ABI_VERSION);1248}1249static CLASS_ATTR_RO(abi_version);1250 1251static struct attribute *umad_class_attrs[] = {1252 &class_attr_abi_version.attr,1253 NULL,1254};1255ATTRIBUTE_GROUPS(umad_class);1256 1257static struct class umad_class = {1258 .name = "infiniband_mad",1259 .devnode = umad_devnode,1260 .class_groups = umad_class_groups,1261 .dev_groups = umad_class_dev_groups,1262};1263 1264static void ib_umad_release_port(struct device *device)1265{1266 struct ib_umad_port *port = dev_get_drvdata(device);1267 struct ib_umad_device *umad_dev = port->umad_dev;1268 1269 ib_umad_dev_put(umad_dev);1270}1271 1272static void ib_umad_init_port_dev(struct device *dev,1273 struct ib_umad_port *port,1274 const struct ib_device *device)1275{1276 device_initialize(dev);1277 ib_umad_dev_get(port->umad_dev);1278 dev->class = &umad_class;1279 dev->parent = device->dev.parent;1280 dev_set_drvdata(dev, port);1281 dev->release = ib_umad_release_port;1282}1283 1284static int ib_umad_init_port(struct ib_device *device, int port_num,1285 struct ib_umad_device *umad_dev,1286 struct ib_umad_port *port)1287{1288 int devnum;1289 dev_t base_umad;1290 dev_t base_issm;1291 int ret;1292 1293 devnum = ida_alloc_max(&umad_ida, IB_UMAD_MAX_PORTS - 1, GFP_KERNEL);1294 if (devnum < 0)1295 return -1;1296 port->dev_num = devnum;1297 if (devnum >= IB_UMAD_NUM_FIXED_MINOR) {1298 base_umad = dynamic_umad_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;1299 base_issm = dynamic_issm_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;1300 } else {1301 base_umad = devnum + base_umad_dev;1302 base_issm = devnum + base_issm_dev;1303 }1304 1305 port->ib_dev = device;1306 port->umad_dev = umad_dev;1307 port->port_num = port_num;1308 sema_init(&port->sm_sem, 1);1309 mutex_init(&port->file_mutex);1310 INIT_LIST_HEAD(&port->file_list);1311 1312 ib_umad_init_port_dev(&port->dev, port, device);1313 port->dev.devt = base_umad;1314 dev_set_name(&port->dev, "umad%d", port->dev_num);1315 cdev_init(&port->cdev, &umad_fops);1316 port->cdev.owner = THIS_MODULE;1317 1318 ret = cdev_device_add(&port->cdev, &port->dev);1319 if (ret)1320 goto err_cdev;1321 1322 if (rdma_cap_ib_smi(device, port_num)) {1323 ib_umad_init_port_dev(&port->sm_dev, port, device);1324 port->sm_dev.devt = base_issm;1325 dev_set_name(&port->sm_dev, "issm%d", port->dev_num);1326 cdev_init(&port->sm_cdev, &umad_sm_fops);1327 port->sm_cdev.owner = THIS_MODULE;1328 1329 ret = cdev_device_add(&port->sm_cdev, &port->sm_dev);1330 if (ret)1331 goto err_dev;1332 }1333 1334 return 0;1335 1336err_dev:1337 put_device(&port->sm_dev);1338 cdev_device_del(&port->cdev, &port->dev);1339err_cdev:1340 put_device(&port->dev);1341 ida_free(&umad_ida, devnum);1342 return ret;1343}1344 1345static void ib_umad_kill_port(struct ib_umad_port *port)1346{1347 struct ib_umad_file *file;1348 bool has_smi = false;1349 int id;1350 1351 if (rdma_cap_ib_smi(port->ib_dev, port->port_num)) {1352 cdev_device_del(&port->sm_cdev, &port->sm_dev);1353 has_smi = true;1354 }1355 cdev_device_del(&port->cdev, &port->dev);1356 1357 mutex_lock(&port->file_mutex);1358 1359 /* Mark ib_dev NULL and block ioctl or other file ops to progress1360 * further.1361 */1362 port->ib_dev = NULL;1363 1364 list_for_each_entry(file, &port->file_list, port_list) {1365 mutex_lock(&file->mutex);1366 file->agents_dead = 1;1367 wake_up_interruptible(&file->recv_wait);1368 mutex_unlock(&file->mutex);1369 1370 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)1371 if (file->agent[id])1372 ib_unregister_mad_agent(file->agent[id]);1373 }1374 1375 mutex_unlock(&port->file_mutex);1376 1377 ida_free(&umad_ida, port->dev_num);1378 1379 /* balances device_initialize() */1380 if (has_smi)1381 put_device(&port->sm_dev);1382 put_device(&port->dev);1383}1384 1385static int ib_umad_add_one(struct ib_device *device)1386{1387 struct ib_umad_device *umad_dev;1388 int s, e, i;1389 int count = 0;1390 int ret;1391 1392 s = rdma_start_port(device);1393 e = rdma_end_port(device);1394 1395 umad_dev = kzalloc(struct_size(umad_dev, ports,1396 size_add(size_sub(e, s), 1)),1397 GFP_KERNEL);1398 if (!umad_dev)1399 return -ENOMEM;1400 1401 kref_init(&umad_dev->kref);1402 for (i = s; i <= e; ++i) {1403 if (!rdma_cap_ib_mad(device, i))1404 continue;1405 1406 ret = ib_umad_init_port(device, i, umad_dev,1407 &umad_dev->ports[i - s]);1408 if (ret)1409 goto err;1410 1411 count++;1412 }1413 1414 if (!count) {1415 ret = -EOPNOTSUPP;1416 goto free;1417 }1418 1419 ib_set_client_data(device, &umad_client, umad_dev);1420 1421 return 0;1422 1423err:1424 while (--i >= s) {1425 if (!rdma_cap_ib_mad(device, i))1426 continue;1427 1428 ib_umad_kill_port(&umad_dev->ports[i - s]);1429 }1430free:1431 /* balances kref_init */1432 ib_umad_dev_put(umad_dev);1433 return ret;1434}1435 1436static void ib_umad_remove_one(struct ib_device *device, void *client_data)1437{1438 struct ib_umad_device *umad_dev = client_data;1439 unsigned int i;1440 1441 rdma_for_each_port (device, i) {1442 if (rdma_cap_ib_mad(device, i))1443 ib_umad_kill_port(1444 &umad_dev->ports[i - rdma_start_port(device)]);1445 }1446 /* balances kref_init() */1447 ib_umad_dev_put(umad_dev);1448}1449 1450static int __init ib_umad_init(void)1451{1452 int ret;1453 1454 ret = register_chrdev_region(base_umad_dev,1455 IB_UMAD_NUM_FIXED_MINOR * 2,1456 umad_class.name);1457 if (ret) {1458 pr_err("couldn't register device number\n");1459 goto out;1460 }1461 1462 ret = alloc_chrdev_region(&dynamic_umad_dev, 0,1463 IB_UMAD_NUM_DYNAMIC_MINOR * 2,1464 umad_class.name);1465 if (ret) {1466 pr_err("couldn't register dynamic device number\n");1467 goto out_alloc;1468 }1469 dynamic_issm_dev = dynamic_umad_dev + IB_UMAD_NUM_DYNAMIC_MINOR;1470 1471 ret = class_register(&umad_class);1472 if (ret) {1473 pr_err("couldn't create class infiniband_mad\n");1474 goto out_chrdev;1475 }1476 1477 ret = ib_register_client(&umad_client);1478 if (ret)1479 goto out_class;1480 1481 ret = ib_register_client(&issm_client);1482 if (ret)1483 goto out_client;1484 1485 return 0;1486 1487out_client:1488 ib_unregister_client(&umad_client);1489out_class:1490 class_unregister(&umad_class);1491 1492out_chrdev:1493 unregister_chrdev_region(dynamic_umad_dev,1494 IB_UMAD_NUM_DYNAMIC_MINOR * 2);1495 1496out_alloc:1497 unregister_chrdev_region(base_umad_dev,1498 IB_UMAD_NUM_FIXED_MINOR * 2);1499 1500out:1501 return ret;1502}1503 1504static void __exit ib_umad_cleanup(void)1505{1506 ib_unregister_client(&issm_client);1507 ib_unregister_client(&umad_client);1508 class_unregister(&umad_class);1509 unregister_chrdev_region(base_umad_dev,1510 IB_UMAD_NUM_FIXED_MINOR * 2);1511 unregister_chrdev_region(dynamic_umad_dev,1512 IB_UMAD_NUM_DYNAMIC_MINOR * 2);1513}1514 1515module_init(ib_umad_init);1516module_exit(ib_umad_cleanup);1517