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