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