drivers/infiniband/core/user_mad.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 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
  53 #include <linux/uaccess.h>
  54
  55 #include <rdma/ib_mad.h>
  56 #include <rdma/ib_user_mad.h>
  57
  58 #include "core_priv.h"
  59
  60 MODULE_AUTHOR("Roland Dreier");
  61 MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");
  62 MODULE_LICENSE("Dual BSD/GPL");
  63
  64 enum {
  65         IB_UMAD_MAX_PORTS  = RDMA_MAX_PORTS,
  66         IB_UMAD_MAX_AGENTS = 32,
  67
  68         IB_UMAD_MAJOR      = 231,
  69         IB_UMAD_MINOR_BASE = 0,
  70         IB_UMAD_NUM_FIXED_MINOR = 64,
  71         IB_UMAD_NUM_DYNAMIC_MINOR = IB_UMAD_MAX_PORTS - IB_UMAD_NUM_FIXED_MINOR,
  72         IB_ISSM_MINOR_BASE        = IB_UMAD_NUM_FIXED_MINOR,
  73 };
  74
  75 /*
  76  * Our lifetime rules for these structs are the following:
  77  * device special file is opened, we take a reference on the
  78  * ib_umad_port's struct ib_umad_device. We drop these
  79  * references in the corresponding close().
  80  *
  81  * In addition to references coming from open character devices, there
  82  * is one more reference to each ib_umad_device representing the
  83  * module's reference taken when allocating the ib_umad_device in
  84  * ib_umad_add_one().
  85  *
  86  * When destroying an ib_umad_device, we drop the module's reference.
  87  */
  88
  89 struct ib_umad_port {
  90         struct cdev           cdev;
  91         struct device         *dev;
  92
  93         struct cdev           sm_cdev;
  94         struct device         *sm_dev;
  95         struct semaphore       sm_sem;
  96
  97         struct mutex           file_mutex;
  98         struct list_head       file_list;
  99
 100         struct ib_device      *ib_dev;
 101         struct ib_umad_device *umad_dev;
 102         int                    dev_num;
 103         u8                     port_num;
 104 };
 105
 106 struct ib_umad_device {
 107         struct kobject       kobj;
 108         struct ib_umad_port  port[0];
 109 };
 110
 111 struct ib_umad_file {
 112         struct mutex            mutex;
 113         struct ib_umad_port    *port;
 114         struct list_head        recv_list;
 115         struct list_head        send_list;
 116         struct list_head        port_list;
 117         spinlock_t              send_lock;
 118         wait_queue_head_t       recv_wait;
 119         struct ib_mad_agent    *agent[IB_UMAD_MAX_AGENTS];
 120         int                     agents_dead;
 121         u8                      use_pkey_index;
 122         u8                      already_used;
 123 };
 124
 125 struct ib_umad_packet {
 126         struct ib_mad_send_buf *msg;
 127         struct ib_mad_recv_wc  *recv_wc;
 128         struct list_head   list;
 129         int                length;
 130         struct ib_user_mad mad;
 131 };
 132
 133 static struct class *umad_class;
 134
 135 static const dev_t base_umad_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
 136 static const dev_t base_issm_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE) +
 137                                    IB_UMAD_NUM_FIXED_MINOR;
 138 static dev_t dynamic_umad_dev;
 139 static dev_t dynamic_issm_dev;
 140
 141 static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS);
 142
 143 static void ib_umad_add_one(struct ib_device *device);
 144 static void ib_umad_remove_one(struct ib_device *device, void *client_data);
 145
 146 static void ib_umad_release_dev(struct kobject *kobj)
 147 {
 148         struct ib_umad_device *dev =
 149                 container_of(kobj, struct ib_umad_device, kobj);
 150
 151         kfree(dev);
 152 }
 153
 154 static struct kobj_type ib_umad_dev_ktype = {
 155         .release = ib_umad_release_dev,
 156 };
 157
 158 static int hdr_size(struct ib_umad_file *file)
 159 {
 160         return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) :
 161                 sizeof (struct ib_user_mad_hdr_old);
 162 }
 163
 164 /* caller must hold file->mutex */
 165 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
 166 {
 167         return file->agents_dead ? NULL : file->agent[id];
 168 }
 169
 170 static int queue_packet(struct ib_umad_file *file,
 171                         struct ib_mad_agent *agent,
 172                         struct ib_umad_packet *packet)
 173 {
 174         int ret = 1;
 175
 176         mutex_lock(&file->mutex);
 177
 178         for (packet->mad.hdr.id = 0;
 179              packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
 180              packet->mad.hdr.id++)
 181                 if (agent == __get_agent(file, packet->mad.hdr.id)) {
 182                         list_add_tail(&packet->list, &file->recv_list);
 183                         wake_up_interruptible(&file->recv_wait);
 184                         ret = 0;
 185                         break;
 186                 }
 187
 188         mutex_unlock(&file->mutex);
 189
 190         return ret;
 191 }
 192
 193 static void dequeue_send(struct ib_umad_file *file,
 194                          struct ib_umad_packet *packet)
 195 {
 196         spin_lock_irq(&file->send_lock);
 197         list_del(&packet->list);
 198         spin_unlock_irq(&file->send_lock);
 199 }
 200
 201 static void send_handler(struct ib_mad_agent *agent,
 202                          struct ib_mad_send_wc *send_wc)
 203 {
 204         struct ib_umad_file *file = agent->context;
 205         struct ib_umad_packet *packet = send_wc->send_buf->context[0];
 206
 207         dequeue_send(file, packet);
 208         rdma_destroy_ah(packet->msg->ah);
 209         ib_free_send_mad(packet->msg);
 210
 211         if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
 212                 packet->length = IB_MGMT_MAD_HDR;
 213                 packet->mad.hdr.status = ETIMEDOUT;
 214                 if (!queue_packet(file, agent, packet))
 215                         return;
 216         }
 217         kfree(packet);
 218 }
 219
 220 static void recv_handler(struct ib_mad_agent *agent,
 221                          struct ib_mad_send_buf *send_buf,
 222                          struct ib_mad_recv_wc *mad_recv_wc)
 223 {
 224         struct ib_umad_file *file = agent->context;
 225         struct ib_umad_packet *packet;
 226
 227         if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
 228                 goto err1;
 229
 230         packet = kzalloc(sizeof *packet, GFP_KERNEL);
 231         if (!packet)
 232                 goto err1;
 233
 234         packet->length = mad_recv_wc->mad_len;
 235         packet->recv_wc = mad_recv_wc;
 236
 237         packet->mad.hdr.status     = 0;
 238         packet->mad.hdr.length     = hdr_size(file) + mad_recv_wc->mad_len;
 239         packet->mad.hdr.qpn        = cpu_to_be32(mad_recv_wc->wc->src_qp);
 240         /*
 241          * On OPA devices it is okay to lose the upper 16 bits of LID as this
 242          * information is obtained elsewhere. Mask off the upper 16 bits.
 243          */
 244         if (rdma_cap_opa_mad(agent->device, agent->port_num))
 245                 packet->mad.hdr.lid = ib_lid_be16(0xFFFF &
 246                                                   mad_recv_wc->wc->slid);
 247         else
 248                 packet->mad.hdr.lid = ib_lid_be16(mad_recv_wc->wc->slid);
 249         packet->mad.hdr.sl         = mad_recv_wc->wc->sl;
 250         packet->mad.hdr.path_bits  = mad_recv_wc->wc->dlid_path_bits;
 251         packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;
 252         packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
 253         if (packet->mad.hdr.grh_present) {
 254                 struct rdma_ah_attr ah_attr;
 255                 const struct ib_global_route *grh;
 256                 int ret;
 257
 258                 ret = ib_init_ah_attr_from_wc(agent->device, agent->port_num,
 259                                               mad_recv_wc->wc,
 260                                               mad_recv_wc->recv_buf.grh,
 261                                               &ah_attr);
 262                 if (ret)
 263                         goto err2;
 264
 265                 grh = rdma_ah_read_grh(&ah_attr);
 266                 packet->mad.hdr.gid_index = grh->sgid_index;
 267                 packet->mad.hdr.hop_limit = grh->hop_limit;
 268                 packet->mad.hdr.traffic_class = grh->traffic_class;
 269                 memcpy(packet->mad.hdr.gid, &grh->dgid, 16);
 270                 packet->mad.hdr.flow_label = cpu_to_be32(grh->flow_label);
 271                 rdma_destroy_ah_attr(&ah_attr);
 272         }
 273
 274         if (queue_packet(file, agent, packet))
 275                 goto err2;
 276         return;
 277
 278 err2:
 279         kfree(packet);
 280 err1:
 281         ib_free_recv_mad(mad_recv_wc);
 282 }
 283
 284 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
 285                              struct ib_umad_packet *packet, size_t count)
 286 {
 287         struct ib_mad_recv_buf *recv_buf;
 288         int left, seg_payload, offset, max_seg_payload;
 289         size_t seg_size;
 290
 291         recv_buf = &packet->recv_wc->recv_buf;
 292         seg_size = packet->recv_wc->mad_seg_size;
 293
 294         /* We need enough room to copy the first (or only) MAD segment. */
 295         if ((packet->length <= seg_size &&
 296              count < hdr_size(file) + packet->length) ||
 297             (packet->length > seg_size &&
 298              count < hdr_size(file) + seg_size))
 299                 return -EINVAL;
 300
 301         if (copy_to_user(buf, &packet->mad, hdr_size(file)))
 302                 return -EFAULT;
 303
 304         buf += hdr_size(file);
 305         seg_payload = min_t(int, packet->length, seg_size);
 306         if (copy_to_user(buf, recv_buf->mad, seg_payload))
 307                 return -EFAULT;
 308
 309         if (seg_payload < packet->length) {
 310                 /*
 311                  * Multipacket RMPP MAD message. Copy remainder of message.
 312                  * Note that last segment may have a shorter payload.
 313                  */
 314                 if (count < hdr_size(file) + packet->length) {
 315                         /*
 316                          * The buffer is too small, return the first RMPP segment,
 317                          * which includes the RMPP message length.
 318                          */
 319                         return -ENOSPC;
 320                 }
 321                 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
 322                 max_seg_payload = seg_size - offset;
 323
 324                 for (left = packet->length - seg_payload, buf += seg_payload;
 325                      left; left -= seg_payload, buf += seg_payload) {
 326                         recv_buf = container_of(recv_buf->list.next,
 327                                                 struct ib_mad_recv_buf, list);
 328                         seg_payload = min(left, max_seg_payload);
 329                         if (copy_to_user(buf, ((void *) recv_buf->mad) + offset,
 330                                          seg_payload))
 331                                 return -EFAULT;
 332                 }
 333         }
 334         return hdr_size(file) + packet->length;
 335 }
 336
 337 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
 338                              struct ib_umad_packet *packet, size_t count)
 339 {
 340         ssize_t size = hdr_size(file) + packet->length;
 341
 342         if (count < size)
 343                 return -EINVAL;
 344
 345         if (copy_to_user(buf, &packet->mad, hdr_size(file)))
 346                 return -EFAULT;
 347
 348         buf += hdr_size(file);
 349
 350         if (copy_to_user(buf, packet->mad.data, packet->length))
 351                 return -EFAULT;
 352
 353         return size;
 354 }
 355
 356 static ssize_t ib_umad_read(struct file *filp, char __user *buf,
 357                             size_t count, loff_t *pos)
 358 {
 359         struct ib_umad_file *file = filp->private_data;
 360         struct ib_umad_packet *packet;
 361         ssize_t ret;
 362
 363         if (count < hdr_size(file))
 364                 return -EINVAL;
 365
 366         mutex_lock(&file->mutex);
 367
 368         while (list_empty(&file->recv_list)) {
 369                 mutex_unlock(&file->mutex);
 370
 371                 if (filp->f_flags & O_NONBLOCK)
 372                         return -EAGAIN;
 373
 374                 if (wait_event_interruptible(file->recv_wait,
 375                                              !list_empty(&file->recv_list)))
 376                         return -ERESTARTSYS;
 377
 378                 mutex_lock(&file->mutex);
 379         }
 380
 381         packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
 382         list_del(&packet->list);
 383
 384         mutex_unlock(&file->mutex);
 385
 386         if (packet->recv_wc)
 387                 ret = copy_recv_mad(file, buf, packet, count);
 388         else
 389                 ret = copy_send_mad(file, buf, packet, count);
 390
 391         if (ret < 0) {
 392                 /* Requeue packet */
 393                 mutex_lock(&file->mutex);
 394                 list_add(&packet->list, &file->recv_list);
 395                 mutex_unlock(&file->mutex);
 396         } else {
 397                 if (packet->recv_wc)
 398                         ib_free_recv_mad(packet->recv_wc);
 399                 kfree(packet);
 400         }
 401         return ret;
 402 }
 403
 404 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
 405 {
 406         int left, seg;
 407
 408         /* Copy class specific header */
 409         if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
 410             copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
 411                            msg->hdr_len - IB_MGMT_RMPP_HDR))
 412                 return -EFAULT;
 413
 414         /* All headers are in place.  Copy data segments. */
 415         for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
 416              seg++, left -= msg->seg_size, buf += msg->seg_size) {
 417                 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
 418                                    min(left, msg->seg_size)))
 419                         return -EFAULT;
 420         }
 421         return 0;
 422 }
 423
 424 static int same_destination(struct ib_user_mad_hdr *hdr1,
 425                             struct ib_user_mad_hdr *hdr2)
 426 {
 427         if (!hdr1->grh_present && !hdr2->grh_present)
 428            return (hdr1->lid == hdr2->lid);
 429
 430         if (hdr1->grh_present && hdr2->grh_present)
 431            return !memcmp(hdr1->gid, hdr2->gid, 16);
 432
 433         return 0;
 434 }
 435
 436 static int is_duplicate(struct ib_umad_file *file,
 437                         struct ib_umad_packet *packet)
 438 {
 439         struct ib_umad_packet *sent_packet;
 440         struct ib_mad_hdr *sent_hdr, *hdr;
 441
 442         hdr = (struct ib_mad_hdr *) packet->mad.data;
 443         list_for_each_entry(sent_packet, &file->send_list, list) {
 444                 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
 445
 446                 if ((hdr->tid != sent_hdr->tid) ||
 447                     (hdr->mgmt_class != sent_hdr->mgmt_class))
 448                         continue;
 449
 450                 /*
 451                  * No need to be overly clever here.  If two new operations have
 452                  * the same TID, reject the second as a duplicate.  This is more
 453                  * restrictive than required by the spec.
 454                  */
 455                 if (!ib_response_mad(hdr)) {
 456                         if (!ib_response_mad(sent_hdr))
 457                                 return 1;
 458                         continue;
 459                 } else if (!ib_response_mad(sent_hdr))
 460                         continue;
 461
 462                 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
 463                         return 1;
 464         }
 465
 466         return 0;
 467 }
 468
 469 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
 470                              size_t count, loff_t *pos)
 471 {
 472         struct ib_umad_file *file = filp->private_data;
 473         struct ib_umad_packet *packet;
 474         struct ib_mad_agent *agent;
 475         struct rdma_ah_attr ah_attr;
 476         struct ib_ah *ah;
 477         struct ib_rmpp_mad *rmpp_mad;
 478         __be64 *tid;
 479         int ret, data_len, hdr_len, copy_offset, rmpp_active;
 480         u8 base_version;
 481
 482         if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
 483                 return -EINVAL;
 484
 485         packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
 486         if (!packet)
 487                 return -ENOMEM;
 488
 489         if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
 490                 ret = -EFAULT;
 491                 goto err;
 492         }
 493
 494         if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
 495                 ret = -EINVAL;
 496                 goto err;
 497         }
 498
 499         buf += hdr_size(file);
 500
 501         if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
 502                 ret = -EFAULT;
 503                 goto err;
 504         }
 505
 506         mutex_lock(&file->mutex);
 507
 508         agent = __get_agent(file, packet->mad.hdr.id);
 509         if (!agent) {
 510                 ret = -EINVAL;
 511                 goto err_up;
 512         }
 513
 514         memset(&ah_attr, 0, sizeof ah_attr);
 515         ah_attr.type = rdma_ah_find_type(agent->device,
 516                                          file->port->port_num);
 517         rdma_ah_set_dlid(&ah_attr, be16_to_cpu(packet->mad.hdr.lid));
 518         rdma_ah_set_sl(&ah_attr, packet->mad.hdr.sl);
 519         rdma_ah_set_path_bits(&ah_attr, packet->mad.hdr.path_bits);
 520         rdma_ah_set_port_num(&ah_attr, file->port->port_num);
 521         if (packet->mad.hdr.grh_present) {
 522                 rdma_ah_set_grh(&ah_attr, NULL,
 523                                 be32_to_cpu(packet->mad.hdr.flow_label),
 524                                 packet->mad.hdr.gid_index,
 525                                 packet->mad.hdr.hop_limit,
 526                                 packet->mad.hdr.traffic_class);
 527                 rdma_ah_set_dgid_raw(&ah_attr, packet->mad.hdr.gid);
 528         }
 529
 530         ah = rdma_create_user_ah(agent->qp->pd, &ah_attr, NULL);
 531         if (IS_ERR(ah)) {
 532                 ret = PTR_ERR(ah);
 533                 goto err_up;
 534         }
 535
 536         rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
 537         hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
 538
 539         if (ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
 540             && ib_mad_kernel_rmpp_agent(agent)) {
 541                 copy_offset = IB_MGMT_RMPP_HDR;
 542                 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 543                                                 IB_MGMT_RMPP_FLAG_ACTIVE;
 544         } else {
 545                 copy_offset = IB_MGMT_MAD_HDR;
 546                 rmpp_active = 0;
 547         }
 548
 549         base_version = ((struct ib_mad_hdr *)&packet->mad.data)->base_version;
 550         data_len = count - hdr_size(file) - hdr_len;
 551         packet->msg = ib_create_send_mad(agent,
 552                                          be32_to_cpu(packet->mad.hdr.qpn),
 553                                          packet->mad.hdr.pkey_index, rmpp_active,
 554                                          hdr_len, data_len, GFP_KERNEL,
 555                                          base_version);
 556         if (IS_ERR(packet->msg)) {
 557                 ret = PTR_ERR(packet->msg);
 558                 goto err_ah;
 559         }
 560
 561         packet->msg->ah         = ah;
 562         packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
 563         packet->msg->retries    = packet->mad.hdr.retries;
 564         packet->msg->context[0] = packet;
 565
 566         /* Copy MAD header.  Any RMPP header is already in place. */
 567         memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
 568
 569         if (!rmpp_active) {
 570                 if (copy_from_user(packet->msg->mad + copy_offset,
 571                                    buf + copy_offset,
 572                                    hdr_len + data_len - copy_offset)) {
 573                         ret = -EFAULT;
 574                         goto err_msg;
 575                 }
 576         } else {
 577                 ret = copy_rmpp_mad(packet->msg, buf);
 578                 if (ret)
 579                         goto err_msg;
 580         }
 581
 582         /*
 583          * Set the high-order part of the transaction ID to make MADs from
 584          * different agents unique, and allow routing responses back to the
 585          * original requestor.
 586          */
 587         if (!ib_response_mad(packet->msg->mad)) {
 588                 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
 589                 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
 590                                    (be64_to_cpup(tid) & 0xffffffff));
 591                 rmpp_mad->mad_hdr.tid = *tid;
 592         }
 593
 594         if (!ib_mad_kernel_rmpp_agent(agent)
 595            && ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
 596            && (ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE)) {
 597                 spin_lock_irq(&file->send_lock);
 598                 list_add_tail(&packet->list, &file->send_list);
 599                 spin_unlock_irq(&file->send_lock);
 600         } else {
 601                 spin_lock_irq(&file->send_lock);
 602                 ret = is_duplicate(file, packet);
 603                 if (!ret)
 604                         list_add_tail(&packet->list, &file->send_list);
 605                 spin_unlock_irq(&file->send_lock);
 606                 if (ret) {
 607                         ret = -EINVAL;
 608                         goto err_msg;
 609                 }
 610         }
 611
 612         ret = ib_post_send_mad(packet->msg, NULL);
 613         if (ret)
 614                 goto err_send;
 615
 616         mutex_unlock(&file->mutex);
 617         return count;
 618
 619 err_send:
 620         dequeue_send(file, packet);
 621 err_msg:
 622         ib_free_send_mad(packet->msg);
 623 err_ah:
 624         rdma_destroy_ah(ah);
 625 err_up:
 626         mutex_unlock(&file->mutex);
 627 err:
 628         kfree(packet);
 629         return ret;
 630 }
 631
 632 static __poll_t ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
 633 {
 634         struct ib_umad_file *file = filp->private_data;
 635
 636         /* we will always be able to post a MAD send */
 637         __poll_t mask = EPOLLOUT | EPOLLWRNORM;
 638
 639         poll_wait(filp, &file->recv_wait, wait);
 640
 641         if (!list_empty(&file->recv_list))
 642                 mask |= EPOLLIN | EPOLLRDNORM;
 643
 644         return mask;
 645 }
 646
 647 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
 648                              int compat_method_mask)
 649 {
 650         struct ib_user_mad_reg_req ureq;
 651         struct ib_mad_reg_req req;
 652         struct ib_mad_agent *agent = NULL;
 653         int agent_id;
 654         int ret;
 655
 656         mutex_lock(&file->port->file_mutex);
 657         mutex_lock(&file->mutex);
 658
 659         if (!file->port->ib_dev) {
 660                 dev_notice(file->port->dev,
 661                            "ib_umad_reg_agent: invalid device\n");
 662                 ret = -EPIPE;
 663                 goto out;
 664         }
 665
 666         if (copy_from_user(&ureq, arg, sizeof ureq)) {
 667                 ret = -EFAULT;
 668                 goto out;
 669         }
 670
 671         if (ureq.qpn != 0 && ureq.qpn != 1) {
 672                 dev_notice(file->port->dev,
 673                            "ib_umad_reg_agent: invalid QPN %d specified\n",
 674                            ureq.qpn);
 675                 ret = -EINVAL;
 676                 goto out;
 677         }
 678
 679         for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
 680                 if (!__get_agent(file, agent_id))
 681                         goto found;
 682
 683         dev_notice(file->port->dev,
 684                    "ib_umad_reg_agent: Max Agents (%u) reached\n",
 685                    IB_UMAD_MAX_AGENTS);
 686         ret = -ENOMEM;
 687         goto out;
 688
 689 found:
 690         if (ureq.mgmt_class) {
 691                 memset(&req, 0, sizeof(req));
 692                 req.mgmt_class         = ureq.mgmt_class;
 693                 req.mgmt_class_version = ureq.mgmt_class_version;
 694                 memcpy(req.oui, ureq.oui, sizeof req.oui);
 695
 696                 if (compat_method_mask) {
 697                         u32 *umm = (u32 *) ureq.method_mask;
 698                         int i;
 699
 700                         for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
 701                                 req.method_mask[i] =
 702                                         umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
 703                 } else
 704                         memcpy(req.method_mask, ureq.method_mask,
 705                                sizeof req.method_mask);
 706         }
 707
 708         agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
 709                                       ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
 710                                       ureq.mgmt_class ? &req : NULL,
 711                                       ureq.rmpp_version,
 712                                       send_handler, recv_handler, file, 0);
 713         if (IS_ERR(agent)) {
 714                 ret = PTR_ERR(agent);
 715                 agent = NULL;
 716                 goto out;
 717         }
 718
 719         if (put_user(agent_id,
 720                      (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
 721                 ret = -EFAULT;
 722                 goto out;
 723         }
 724
 725         if (!file->already_used) {
 726                 file->already_used = 1;
 727                 if (!file->use_pkey_index) {
 728                         dev_warn(file->port->dev,
 729                                 "process %s did not enable P_Key index support.\n",
 730                                 current->comm);
 731                         dev_warn(file->port->dev,
 732                                 "   Documentation/infiniband/user_mad.txt has info on the new ABI.\n");
 733                 }
 734         }
 735
 736         file->agent[agent_id] = agent;
 737         ret = 0;
 738
 739 out:
 740         mutex_unlock(&file->mutex);
 741
 742         if (ret && agent)
 743                 ib_unregister_mad_agent(agent);
 744
 745         mutex_unlock(&file->port->file_mutex);
 746
 747         return ret;
 748 }
 749
 750 static int ib_umad_reg_agent2(struct ib_umad_file *file, void __user *arg)
 751 {
 752         struct ib_user_mad_reg_req2 ureq;
 753         struct ib_mad_reg_req req;
 754         struct ib_mad_agent *agent = NULL;
 755         int agent_id;
 756         int ret;
 757
 758         mutex_lock(&file->port->file_mutex);
 759         mutex_lock(&file->mutex);
 760
 761         if (!file->port->ib_dev) {
 762                 dev_notice(file->port->dev,
 763                            "ib_umad_reg_agent2: invalid device\n");
 764                 ret = -EPIPE;
 765                 goto out;
 766         }
 767
 768         if (copy_from_user(&ureq, arg, sizeof(ureq))) {
 769                 ret = -EFAULT;
 770                 goto out;
 771         }
 772
 773         if (ureq.qpn != 0 && ureq.qpn != 1) {
 774                 dev_notice(file->port->dev,
 775                            "ib_umad_reg_agent2: invalid QPN %d specified\n",
 776                            ureq.qpn);
 777                 ret = -EINVAL;
 778                 goto out;
 779         }
 780
 781         if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) {
 782                 dev_notice(file->port->dev,
 783                            "ib_umad_reg_agent2 failed: invalid registration flags specified 0x%x; supported 0x%x\n",
 784                            ureq.flags, IB_USER_MAD_REG_FLAGS_CAP);
 785                 ret = -EINVAL;
 786
 787                 if (put_user((u32)IB_USER_MAD_REG_FLAGS_CAP,
 788                                 (u32 __user *) (arg + offsetof(struct
 789                                 ib_user_mad_reg_req2, flags))))
 790                         ret = -EFAULT;
 791
 792                 goto out;
 793         }
 794
 795         for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
 796                 if (!__get_agent(file, agent_id))
 797                         goto found;
 798
 799         dev_notice(file->port->dev,
 800                    "ib_umad_reg_agent2: Max Agents (%u) reached\n",
 801                    IB_UMAD_MAX_AGENTS);
 802         ret = -ENOMEM;
 803         goto out;
 804
 805 found:
 806         if (ureq.mgmt_class) {
 807                 memset(&req, 0, sizeof(req));
 808                 req.mgmt_class         = ureq.mgmt_class;
 809                 req.mgmt_class_version = ureq.mgmt_class_version;
 810                 if (ureq.oui & 0xff000000) {
 811                         dev_notice(file->port->dev,
 812                                    "ib_umad_reg_agent2 failed: oui invalid 0x%08x\n",
 813                                    ureq.oui);
 814                         ret = -EINVAL;
 815                         goto out;
 816                 }
 817                 req.oui[2] =  ureq.oui & 0x0000ff;
 818                 req.oui[1] = (ureq.oui & 0x00ff00) >> 8;
 819                 req.oui[0] = (ureq.oui & 0xff0000) >> 16;
 820                 memcpy(req.method_mask, ureq.method_mask,
 821                         sizeof(req.method_mask));
 822         }
 823
 824         agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
 825                                       ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
 826                                       ureq.mgmt_class ? &req : NULL,
 827                                       ureq.rmpp_version,
 828                                       send_handler, recv_handler, file,
 829                                       ureq.flags);
 830         if (IS_ERR(agent)) {
 831                 ret = PTR_ERR(agent);
 832                 agent = NULL;
 833                 goto out;
 834         }
 835
 836         if (put_user(agent_id,
 837                      (u32 __user *)(arg +
 838                                 offsetof(struct ib_user_mad_reg_req2, id)))) {
 839                 ret = -EFAULT;
 840                 goto out;
 841         }
 842
 843         if (!file->already_used) {
 844                 file->already_used = 1;
 845                 file->use_pkey_index = 1;
 846         }
 847
 848         file->agent[agent_id] = agent;
 849         ret = 0;
 850
 851 out:
 852         mutex_unlock(&file->mutex);
 853
 854         if (ret && agent)
 855                 ib_unregister_mad_agent(agent);
 856
 857         mutex_unlock(&file->port->file_mutex);
 858
 859         return ret;
 860 }
 861
 862
 863 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
 864 {
 865         struct ib_mad_agent *agent = NULL;
 866         u32 id;
 867         int ret = 0;
 868
 869         if (get_user(id, arg))
 870                 return -EFAULT;
 871
 872         mutex_lock(&file->port->file_mutex);
 873         mutex_lock(&file->mutex);
 874
 875         if (id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
 876                 ret = -EINVAL;
 877                 goto out;
 878         }
 879
 880         agent = file->agent[id];
 881         file->agent[id] = NULL;
 882
 883 out:
 884         mutex_unlock(&file->mutex);
 885
 886         if (agent)
 887                 ib_unregister_mad_agent(agent);
 888
 889         mutex_unlock(&file->port->file_mutex);
 890
 891         return ret;
 892 }
 893
 894 static long ib_umad_enable_pkey(struct ib_umad_file *file)
 895 {
 896         int ret = 0;
 897
 898         mutex_lock(&file->mutex);
 899         if (file->already_used)
 900                 ret = -EINVAL;
 901         else
 902                 file->use_pkey_index = 1;
 903         mutex_unlock(&file->mutex);
 904
 905         return ret;
 906 }
 907
 908 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
 909                           unsigned long arg)
 910 {
 911         switch (cmd) {
 912         case IB_USER_MAD_REGISTER_AGENT:
 913                 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
 914         case IB_USER_MAD_UNREGISTER_AGENT:
 915                 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
 916         case IB_USER_MAD_ENABLE_PKEY:
 917                 return ib_umad_enable_pkey(filp->private_data);
 918         case IB_USER_MAD_REGISTER_AGENT2:
 919                 return ib_umad_reg_agent2(filp->private_data, (void __user *) arg);
 920         default:
 921                 return -ENOIOCTLCMD;
 922         }
 923 }
 924
 925 #ifdef CONFIG_COMPAT
 926 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
 927                                  unsigned long arg)
 928 {
 929         switch (cmd) {
 930         case IB_USER_MAD_REGISTER_AGENT:
 931                 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
 932         case IB_USER_MAD_UNREGISTER_AGENT:
 933                 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
 934         case IB_USER_MAD_ENABLE_PKEY:
 935                 return ib_umad_enable_pkey(filp->private_data);
 936         case IB_USER_MAD_REGISTER_AGENT2:
 937                 return ib_umad_reg_agent2(filp->private_data, compat_ptr(arg));
 938         default:
 939                 return -ENOIOCTLCMD;
 940         }
 941 }
 942 #endif
 943
 944 /*
 945  * ib_umad_open() does not need the BKL:
 946  *
 947  *  - the ib_umad_port structures are properly reference counted, and
 948  *    everything else is purely local to the file being created, so
 949  *    races against other open calls are not a problem;
 950  *  - the ioctl method does not affect any global state outside of the
 951  *    file structure being operated on;
 952  */
 953 static int ib_umad_open(struct inode *inode, struct file *filp)
 954 {
 955         struct ib_umad_port *port;
 956         struct ib_umad_file *file;
 957         int ret = -ENXIO;
 958
 959         port = container_of(inode->i_cdev, struct ib_umad_port, cdev);
 960
 961         mutex_lock(&port->file_mutex);
 962
 963         if (!port->ib_dev)
 964                 goto out;
 965
 966         ret = -ENOMEM;
 967         file = kzalloc(sizeof *file, GFP_KERNEL);
 968         if (!file)
 969                 goto out;
 970
 971         mutex_init(&file->mutex);
 972         spin_lock_init(&file->send_lock);
 973         INIT_LIST_HEAD(&file->recv_list);
 974         INIT_LIST_HEAD(&file->send_list);
 975         init_waitqueue_head(&file->recv_wait);
 976
 977         file->port = port;
 978         filp->private_data = file;
 979
 980         list_add_tail(&file->port_list, &port->file_list);
 981
 982         ret = nonseekable_open(inode, filp);
 983         if (ret) {
 984                 list_del(&file->port_list);
 985                 kfree(file);
 986                 goto out;
 987         }
 988
 989         kobject_get(&port->umad_dev->kobj);
 990
 991 out:
 992         mutex_unlock(&port->file_mutex);
 993         return ret;
 994 }
 995
 996 static int ib_umad_close(struct inode *inode, struct file *filp)
 997 {
 998         struct ib_umad_file *file = filp->private_data;
 999         struct ib_umad_device *dev = file->port->umad_dev;
1000         struct ib_umad_packet *packet, *tmp;
1001         int already_dead;
1002         int i;
1003
1004         mutex_lock(&file->port->file_mutex);
1005         mutex_lock(&file->mutex);
1006
1007         already_dead = file->agents_dead;
1008         file->agents_dead = 1;
1009
1010         list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
1011                 if (packet->recv_wc)
1012                         ib_free_recv_mad(packet->recv_wc);
1013                 kfree(packet);
1014         }
1015
1016         list_del(&file->port_list);
1017
1018         mutex_unlock(&file->mutex);
1019
1020         if (!already_dead)
1021                 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
1022                         if (file->agent[i])
1023                                 ib_unregister_mad_agent(file->agent[i]);
1024
1025         mutex_unlock(&file->port->file_mutex);
1026
1027         kfree(file);
1028         kobject_put(&dev->kobj);
1029
1030         return 0;
1031 }
1032
1033 static const struct file_operations umad_fops = {
1034         .owner          = THIS_MODULE,
1035         .read           = ib_umad_read,
1036         .write          = ib_umad_write,
1037         .poll           = ib_umad_poll,
1038         .unlocked_ioctl = ib_umad_ioctl,
1039 #ifdef CONFIG_COMPAT
1040         .compat_ioctl   = ib_umad_compat_ioctl,
1041 #endif
1042         .open           = ib_umad_open,
1043         .release        = ib_umad_close,
1044         .llseek         = no_llseek,
1045 };
1046
1047 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
1048 {
1049         struct ib_umad_port *port;
1050         struct ib_port_modify props = {
1051                 .set_port_cap_mask = IB_PORT_SM
1052         };
1053         int ret;
1054
1055         port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev);
1056
1057         if (filp->f_flags & O_NONBLOCK) {
1058                 if (down_trylock(&port->sm_sem)) {
1059                         ret = -EAGAIN;
1060                         goto fail;
1061                 }
1062         } else {
1063                 if (down_interruptible(&port->sm_sem)) {
1064                         ret = -ERESTARTSYS;
1065                         goto fail;
1066                 }
1067         }
1068
1069         ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1070         if (ret)
1071                 goto err_up_sem;
1072
1073         filp->private_data = port;
1074
1075         ret = nonseekable_open(inode, filp);
1076         if (ret)
1077                 goto err_clr_sm_cap;
1078
1079         kobject_get(&port->umad_dev->kobj);
1080
1081         return 0;
1082
1083 err_clr_sm_cap:
1084         swap(props.set_port_cap_mask, props.clr_port_cap_mask);
1085         ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1086
1087 err_up_sem:
1088         up(&port->sm_sem);
1089
1090 fail:
1091         return ret;
1092 }
1093
1094 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
1095 {
1096         struct ib_umad_port *port = filp->private_data;
1097         struct ib_port_modify props = {
1098                 .clr_port_cap_mask = IB_PORT_SM
1099         };
1100         int ret = 0;
1101
1102         mutex_lock(&port->file_mutex);
1103         if (port->ib_dev)
1104                 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1105         mutex_unlock(&port->file_mutex);
1106
1107         up(&port->sm_sem);
1108
1109         kobject_put(&port->umad_dev->kobj);
1110
1111         return ret;
1112 }
1113
1114 static const struct file_operations umad_sm_fops = {
1115         .owner   = THIS_MODULE,
1116         .open    = ib_umad_sm_open,
1117         .release = ib_umad_sm_close,
1118         .llseek  = no_llseek,
1119 };
1120
1121 static struct ib_client umad_client = {
1122         .name   = "umad",
1123         .add    = ib_umad_add_one,
1124         .remove = ib_umad_remove_one
1125 };
1126
1127 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
1128                           char *buf)
1129 {
1130         struct ib_umad_port *port = dev_get_drvdata(dev);
1131
1132         if (!port)
1133                 return -ENODEV;
1134
1135         return sprintf(buf, "%s\n", port->ib_dev->name);
1136 }
1137 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1138
1139 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
1140                          char *buf)
1141 {
1142         struct ib_umad_port *port = dev_get_drvdata(dev);
1143
1144         if (!port)
1145                 return -ENODEV;
1146
1147         return sprintf(buf, "%d\n", port->port_num);
1148 }
1149 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1150
1151 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1152                          __stringify(IB_USER_MAD_ABI_VERSION));
1153
1154 static int ib_umad_init_port(struct ib_device *device, int port_num,
1155                              struct ib_umad_device *umad_dev,
1156                              struct ib_umad_port *port)
1157 {
1158         int devnum;
1159         dev_t base_umad;
1160         dev_t base_issm;
1161
1162         devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
1163         if (devnum >= IB_UMAD_MAX_PORTS)
1164                 return -1;
1165         port->dev_num = devnum;
1166         set_bit(devnum, dev_map);
1167         if (devnum >= IB_UMAD_NUM_FIXED_MINOR) {
1168                 base_umad = dynamic_umad_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;
1169                 base_issm = dynamic_issm_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;
1170         } else {
1171                 base_umad = devnum + base_umad_dev;
1172                 base_issm = devnum + base_issm_dev;
1173         }
1174
1175         port->ib_dev   = device;
1176         port->port_num = port_num;
1177         sema_init(&port->sm_sem, 1);
1178         mutex_init(&port->file_mutex);
1179         INIT_LIST_HEAD(&port->file_list);
1180
1181         cdev_init(&port->cdev, &umad_fops);
1182         port->cdev.owner = THIS_MODULE;
1183         cdev_set_parent(&port->cdev, &umad_dev->kobj);
1184         kobject_set_name(&port->cdev.kobj, "umad%d", port->dev_num);
1185         if (cdev_add(&port->cdev, base_umad, 1))
1186                 goto err_cdev;
1187
1188         port->dev = device_create(umad_class, device->dev.parent,
1189                                   port->cdev.dev, port,
1190                                   "umad%d", port->dev_num);
1191         if (IS_ERR(port->dev))
1192                 goto err_cdev;
1193
1194         if (device_create_file(port->dev, &dev_attr_ibdev))
1195                 goto err_dev;
1196         if (device_create_file(port->dev, &dev_attr_port))
1197                 goto err_dev;
1198
1199         cdev_init(&port->sm_cdev, &umad_sm_fops);
1200         port->sm_cdev.owner = THIS_MODULE;
1201         cdev_set_parent(&port->sm_cdev, &umad_dev->kobj);
1202         kobject_set_name(&port->sm_cdev.kobj, "issm%d", port->dev_num);
1203         if (cdev_add(&port->sm_cdev, base_issm, 1))
1204                 goto err_sm_cdev;
1205
1206         port->sm_dev = device_create(umad_class, device->dev.parent,
1207                                      port->sm_cdev.dev, port,
1208                                      "issm%d", port->dev_num);
1209         if (IS_ERR(port->sm_dev))
1210                 goto err_sm_cdev;
1211
1212         if (device_create_file(port->sm_dev, &dev_attr_ibdev))
1213                 goto err_sm_dev;
1214         if (device_create_file(port->sm_dev, &dev_attr_port))
1215                 goto err_sm_dev;
1216
1217         return 0;
1218
1219 err_sm_dev:
1220         device_destroy(umad_class, port->sm_cdev.dev);
1221
1222 err_sm_cdev:
1223         cdev_del(&port->sm_cdev);
1224
1225 err_dev:
1226         device_destroy(umad_class, port->cdev.dev);
1227
1228 err_cdev:
1229         cdev_del(&port->cdev);
1230         clear_bit(devnum, dev_map);
1231
1232         return -1;
1233 }
1234
1235 static void ib_umad_kill_port(struct ib_umad_port *port)
1236 {
1237         struct ib_umad_file *file;
1238         int id;
1239
1240         dev_set_drvdata(port->dev,    NULL);
1241         dev_set_drvdata(port->sm_dev, NULL);
1242
1243         device_destroy(umad_class, port->cdev.dev);
1244         device_destroy(umad_class, port->sm_cdev.dev);
1245
1246         cdev_del(&port->cdev);
1247         cdev_del(&port->sm_cdev);
1248
1249         mutex_lock(&port->file_mutex);
1250
1251         port->ib_dev = NULL;
1252
1253         list_for_each_entry(file, &port->file_list, port_list) {
1254                 mutex_lock(&file->mutex);
1255                 file->agents_dead = 1;
1256                 mutex_unlock(&file->mutex);
1257
1258                 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1259                         if (file->agent[id])
1260                                 ib_unregister_mad_agent(file->agent[id]);
1261         }
1262
1263         mutex_unlock(&port->file_mutex);
1264         clear_bit(port->dev_num, dev_map);
1265 }
1266
1267 static void ib_umad_add_one(struct ib_device *device)
1268 {
1269         struct ib_umad_device *umad_dev;
1270         int s, e, i;
1271         int count = 0;
1272
1273         s = rdma_start_port(device);
1274         e = rdma_end_port(device);
1275
1276         umad_dev = kzalloc(sizeof *umad_dev +
1277                            (e - s + 1) * sizeof (struct ib_umad_port),
1278                            GFP_KERNEL);
1279         if (!umad_dev)
1280                 return;
1281
1282         kobject_init(&umad_dev->kobj, &ib_umad_dev_ktype);
1283
1284         for (i = s; i <= e; ++i) {
1285                 if (!rdma_cap_ib_mad(device, i))
1286                         continue;
1287
1288                 umad_dev->port[i - s].umad_dev = umad_dev;
1289
1290                 if (ib_umad_init_port(device, i, umad_dev,
1291                                       &umad_dev->port[i - s]))
1292                         goto err;
1293
1294                 count++;
1295         }
1296
1297         if (!count)
1298                 goto free;
1299
1300         ib_set_client_data(device, &umad_client, umad_dev);
1301
1302         return;
1303
1304 err:
1305         while (--i >= s) {
1306                 if (!rdma_cap_ib_mad(device, i))
1307                         continue;
1308
1309                 ib_umad_kill_port(&umad_dev->port[i - s]);
1310         }
1311 free:
1312         kobject_put(&umad_dev->kobj);
1313 }
1314
1315 static void ib_umad_remove_one(struct ib_device *device, void *client_data)
1316 {
1317         struct ib_umad_device *umad_dev = client_data;
1318         int i;
1319
1320         if (!umad_dev)
1321                 return;
1322
1323         for (i = 0; i <= rdma_end_port(device) - rdma_start_port(device); ++i) {
1324                 if (rdma_cap_ib_mad(device, i + rdma_start_port(device)))
1325                         ib_umad_kill_port(&umad_dev->port[i]);
1326         }
1327
1328         kobject_put(&umad_dev->kobj);
1329 }
1330
1331 static char *umad_devnode(struct device *dev, umode_t *mode)
1332 {
1333         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1334 }
1335
1336 static int __init ib_umad_init(void)
1337 {
1338         int ret;
1339
1340         ret = register_chrdev_region(base_umad_dev,
1341                                      IB_UMAD_NUM_FIXED_MINOR * 2,
1342                                      "infiniband_mad");
1343         if (ret) {
1344                 pr_err("couldn't register device number\n");
1345                 goto out;
1346         }
1347
1348         ret = alloc_chrdev_region(&dynamic_umad_dev, 0,
1349                                   IB_UMAD_NUM_DYNAMIC_MINOR * 2,
1350                                   "infiniband_mad");
1351         if (ret) {
1352                 pr_err("couldn't register dynamic device number\n");
1353                 goto out_alloc;
1354         }
1355         dynamic_issm_dev = dynamic_umad_dev + IB_UMAD_NUM_DYNAMIC_MINOR;
1356
1357         umad_class = class_create(THIS_MODULE, "infiniband_mad");
1358         if (IS_ERR(umad_class)) {
1359                 ret = PTR_ERR(umad_class);
1360                 pr_err("couldn't create class infiniband_mad\n");
1361                 goto out_chrdev;
1362         }
1363
1364         umad_class->devnode = umad_devnode;
1365
1366         ret = class_create_file(umad_class, &class_attr_abi_version.attr);
1367         if (ret) {
1368                 pr_err("couldn't create abi_version attribute\n");
1369                 goto out_class;
1370         }
1371
1372         ret = ib_register_client(&umad_client);
1373         if (ret) {
1374                 pr_err("couldn't register ib_umad client\n");
1375                 goto out_class;
1376         }
1377
1378         return 0;
1379
1380 out_class:
1381         class_destroy(umad_class);
1382
1383 out_chrdev:
1384         unregister_chrdev_region(dynamic_umad_dev,
1385                                  IB_UMAD_NUM_DYNAMIC_MINOR * 2);
1386
1387 out_alloc:
1388         unregister_chrdev_region(base_umad_dev,
1389                                  IB_UMAD_NUM_FIXED_MINOR * 2);
1390
1391 out:
1392         return ret;
1393 }
1394
1395 static void __exit ib_umad_cleanup(void)
1396 {
1397         ib_unregister_client(&umad_client);
1398         class_destroy(umad_class);
1399         unregister_chrdev_region(base_umad_dev,
1400                                  IB_UMAD_NUM_FIXED_MINOR * 2);
1401         unregister_chrdev_region(dynamic_umad_dev,
1402                                  IB_UMAD_NUM_DYNAMIC_MINOR * 2);
1403 }
1404
1405 module_init(ib_umad_init);
1406 module_exit(ib_umad_cleanup);