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 MODULE_AUTHOR("Roland Dreier");
  59 MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");
  60 MODULE_LICENSE("Dual BSD/GPL");
  61
  62 enum {
  63         IB_UMAD_MAX_PORTS  = 64,
  64         IB_UMAD_MAX_AGENTS = 32,
  65
  66         IB_UMAD_MAJOR      = 231,
  67         IB_UMAD_MINOR_BASE = 0
  68 };
  69
  70 /*
  71  * Our lifetime rules for these structs are the following:
  72  * device special file is opened, we take a reference on the
  73  * ib_umad_port's struct ib_umad_device. We drop these
  74  * references in the corresponding close().
  75  *
  76  * In addition to references coming from open character devices, there
  77  * is one more reference to each ib_umad_device representing the
  78  * module's reference taken when allocating the ib_umad_device in
  79  * ib_umad_add_one().
  80  *
  81  * When destroying an ib_umad_device, we drop the module's reference.
  82  */
  83
  84 struct ib_umad_port {
  85         struct cdev           cdev;
  86         struct device         *dev;
  87
  88         struct cdev           sm_cdev;
  89         struct device         *sm_dev;
  90         struct semaphore       sm_sem;
  91
  92         struct mutex           file_mutex;
  93         struct list_head       file_list;
  94
  95         struct ib_device      *ib_dev;
  96         struct ib_umad_device *umad_dev;
  97         int                    dev_num;
  98         u8                     port_num;
  99 };
 100
 101 struct ib_umad_device {
 102         struct kobject       kobj;
 103         struct ib_umad_port  port[0];
 104 };
 105
 106 struct ib_umad_file {
 107         struct mutex            mutex;
 108         struct ib_umad_port    *port;
 109         struct list_head        recv_list;
 110         struct list_head        send_list;
 111         struct list_head        port_list;
 112         spinlock_t              send_lock;
 113         wait_queue_head_t       recv_wait;
 114         struct ib_mad_agent    *agent[IB_UMAD_MAX_AGENTS];
 115         int                     agents_dead;
 116         u8                      use_pkey_index;
 117         u8                      already_used;
 118 };
 119
 120 struct ib_umad_packet {
 121         struct ib_mad_send_buf *msg;
 122         struct ib_mad_recv_wc  *recv_wc;
 123         struct list_head   list;
 124         int                length;
 125         struct ib_user_mad mad;
 126 };
 127
 128 static struct class *umad_class;
 129
 130 static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
 131
 132 static DEFINE_SPINLOCK(port_lock);
 133 static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS);
 134
 135 static void ib_umad_add_one(struct ib_device *device);
 136 static void ib_umad_remove_one(struct ib_device *device, void *client_data);
 137
 138 static void ib_umad_release_dev(struct kobject *kobj)
 139 {
 140         struct ib_umad_device *dev =
 141                 container_of(kobj, struct ib_umad_device, kobj);
 142
 143         kfree(dev);
 144 }
 145
 146 static struct kobj_type ib_umad_dev_ktype = {
 147         .release = ib_umad_release_dev,
 148 };
 149
 150 static int hdr_size(struct ib_umad_file *file)
 151 {
 152         return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) :
 153                 sizeof (struct ib_user_mad_hdr_old);
 154 }
 155
 156 /* caller must hold file->mutex */
 157 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
 158 {
 159         return file->agents_dead ? NULL : file->agent[id];
 160 }
 161
 162 static int queue_packet(struct ib_umad_file *file,
 163                         struct ib_mad_agent *agent,
 164                         struct ib_umad_packet *packet)
 165 {
 166         int ret = 1;
 167
 168         mutex_lock(&file->mutex);
 169
 170         for (packet->mad.hdr.id = 0;
 171              packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
 172              packet->mad.hdr.id++)
 173                 if (agent == __get_agent(file, packet->mad.hdr.id)) {
 174                         list_add_tail(&packet->list, &file->recv_list);
 175                         wake_up_interruptible(&file->recv_wait);
 176                         ret = 0;
 177                         break;
 178                 }
 179
 180         mutex_unlock(&file->mutex);
 181
 182         return ret;
 183 }
 184
 185 static void dequeue_send(struct ib_umad_file *file,
 186                          struct ib_umad_packet *packet)
 187 {
 188         spin_lock_irq(&file->send_lock);
 189         list_del(&packet->list);
 190         spin_unlock_irq(&file->send_lock);
 191 }
 192
 193 static void send_handler(struct ib_mad_agent *agent,
 194                          struct ib_mad_send_wc *send_wc)
 195 {
 196         struct ib_umad_file *file = agent->context;
 197         struct ib_umad_packet *packet = send_wc->send_buf->context[0];
 198
 199         dequeue_send(file, packet);
 200         rdma_destroy_ah(packet->msg->ah);
 201         ib_free_send_mad(packet->msg);
 202
 203         if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
 204                 packet->length = IB_MGMT_MAD_HDR;
 205                 packet->mad.hdr.status = ETIMEDOUT;
 206                 if (!queue_packet(file, agent, packet))
 207                         return;
 208         }
 209         kfree(packet);
 210 }
 211
 212 static void recv_handler(struct ib_mad_agent *agent,
 213                          struct ib_mad_send_buf *send_buf,
 214                          struct ib_mad_recv_wc *mad_recv_wc)
 215 {
 216         struct ib_umad_file *file = agent->context;
 217         struct ib_umad_packet *packet;
 218
 219         if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
 220                 goto err1;
 221
 222         packet = kzalloc(sizeof *packet, GFP_KERNEL);
 223         if (!packet)
 224                 goto err1;
 225
 226         packet->length = mad_recv_wc->mad_len;
 227         packet->recv_wc = mad_recv_wc;
 228
 229         packet->mad.hdr.status     = 0;
 230         packet->mad.hdr.length     = hdr_size(file) + mad_recv_wc->mad_len;
 231         packet->mad.hdr.qpn        = cpu_to_be32(mad_recv_wc->wc->src_qp);
 232         packet->mad.hdr.lid        = cpu_to_be16(mad_recv_wc->wc->slid);
 233         packet->mad.hdr.sl         = mad_recv_wc->wc->sl;
 234         packet->mad.hdr.path_bits  = mad_recv_wc->wc->dlid_path_bits;
 235         packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;
 236         packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
 237         if (packet->mad.hdr.grh_present) {
 238                 struct rdma_ah_attr ah_attr;
 239                 const struct ib_global_route *grh;
 240
 241                 ib_init_ah_from_wc(agent->device, agent->port_num,
 242                                    mad_recv_wc->wc, mad_recv_wc->recv_buf.grh,
 243                                    &ah_attr);
 244
 245                 grh = rdma_ah_read_grh(&ah_attr);
 246                 packet->mad.hdr.gid_index = grh->sgid_index;
 247                 packet->mad.hdr.hop_limit = grh->hop_limit;
 248                 packet->mad.hdr.traffic_class = grh->traffic_class;
 249                 memcpy(packet->mad.hdr.gid, &grh->dgid, 16);
 250                 packet->mad.hdr.flow_label = cpu_to_be32(grh->flow_label);
 251         }
 252
 253         if (queue_packet(file, agent, packet))
 254                 goto err2;
 255         return;
 256
 257 err2:
 258         kfree(packet);
 259 err1:
 260         ib_free_recv_mad(mad_recv_wc);
 261 }
 262
 263 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
 264                              struct ib_umad_packet *packet, size_t count)
 265 {
 266         struct ib_mad_recv_buf *recv_buf;
 267         int left, seg_payload, offset, max_seg_payload;
 268         size_t seg_size;
 269
 270         recv_buf = &packet->recv_wc->recv_buf;
 271         seg_size = packet->recv_wc->mad_seg_size;
 272
 273         /* We need enough room to copy the first (or only) MAD segment. */
 274         if ((packet->length <= seg_size &&
 275              count < hdr_size(file) + packet->length) ||
 276             (packet->length > seg_size &&
 277              count < hdr_size(file) + seg_size))
 278                 return -EINVAL;
 279
 280         if (copy_to_user(buf, &packet->mad, hdr_size(file)))
 281                 return -EFAULT;
 282
 283         buf += hdr_size(file);
 284         seg_payload = min_t(int, packet->length, seg_size);
 285         if (copy_to_user(buf, recv_buf->mad, seg_payload))
 286                 return -EFAULT;
 287
 288         if (seg_payload < packet->length) {
 289                 /*
 290                  * Multipacket RMPP MAD message. Copy remainder of message.
 291                  * Note that last segment may have a shorter payload.
 292                  */
 293                 if (count < hdr_size(file) + packet->length) {
 294                         /*
 295                          * The buffer is too small, return the first RMPP segment,
 296                          * which includes the RMPP message length.
 297                          */
 298                         return -ENOSPC;
 299                 }
 300                 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
 301                 max_seg_payload = seg_size - offset;
 302
 303                 for (left = packet->length - seg_payload, buf += seg_payload;
 304                      left; left -= seg_payload, buf += seg_payload) {
 305                         recv_buf = container_of(recv_buf->list.next,
 306                                                 struct ib_mad_recv_buf, list);
 307                         seg_payload = min(left, max_seg_payload);
 308                         if (copy_to_user(buf, ((void *) recv_buf->mad) + offset,
 309                                          seg_payload))
 310                                 return -EFAULT;
 311                 }
 312         }
 313         return hdr_size(file) + packet->length;
 314 }
 315
 316 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
 317                              struct ib_umad_packet *packet, size_t count)
 318 {
 319         ssize_t size = hdr_size(file) + packet->length;
 320
 321         if (count < size)
 322                 return -EINVAL;
 323
 324         if (copy_to_user(buf, &packet->mad, hdr_size(file)))
 325                 return -EFAULT;
 326
 327         buf += hdr_size(file);
 328
 329         if (copy_to_user(buf, packet->mad.data, packet->length))
 330                 return -EFAULT;
 331
 332         return size;
 333 }
 334
 335 static ssize_t ib_umad_read(struct file *filp, char __user *buf,
 336                             size_t count, loff_t *pos)
 337 {
 338         struct ib_umad_file *file = filp->private_data;
 339         struct ib_umad_packet *packet;
 340         ssize_t ret;
 341
 342         if (count < hdr_size(file))
 343                 return -EINVAL;
 344
 345         mutex_lock(&file->mutex);
 346
 347         while (list_empty(&file->recv_list)) {
 348                 mutex_unlock(&file->mutex);
 349
 350                 if (filp->f_flags & O_NONBLOCK)
 351                         return -EAGAIN;
 352
 353                 if (wait_event_interruptible(file->recv_wait,
 354                                              !list_empty(&file->recv_list)))
 355                         return -ERESTARTSYS;
 356
 357                 mutex_lock(&file->mutex);
 358         }
 359
 360         packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
 361         list_del(&packet->list);
 362
 363         mutex_unlock(&file->mutex);
 364
 365         if (packet->recv_wc)
 366                 ret = copy_recv_mad(file, buf, packet, count);
 367         else
 368                 ret = copy_send_mad(file, buf, packet, count);
 369
 370         if (ret < 0) {
 371                 /* Requeue packet */
 372                 mutex_lock(&file->mutex);
 373                 list_add(&packet->list, &file->recv_list);
 374                 mutex_unlock(&file->mutex);
 375         } else {
 376                 if (packet->recv_wc)
 377                         ib_free_recv_mad(packet->recv_wc);
 378                 kfree(packet);
 379         }
 380         return ret;
 381 }
 382
 383 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
 384 {
 385         int left, seg;
 386
 387         /* Copy class specific header */
 388         if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
 389             copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
 390                            msg->hdr_len - IB_MGMT_RMPP_HDR))
 391                 return -EFAULT;
 392
 393         /* All headers are in place.  Copy data segments. */
 394         for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
 395              seg++, left -= msg->seg_size, buf += msg->seg_size) {
 396                 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
 397                                    min(left, msg->seg_size)))
 398                         return -EFAULT;
 399         }
 400         return 0;
 401 }
 402
 403 static int same_destination(struct ib_user_mad_hdr *hdr1,
 404                             struct ib_user_mad_hdr *hdr2)
 405 {
 406         if (!hdr1->grh_present && !hdr2->grh_present)
 407            return (hdr1->lid == hdr2->lid);
 408
 409         if (hdr1->grh_present && hdr2->grh_present)
 410            return !memcmp(hdr1->gid, hdr2->gid, 16);
 411
 412         return 0;
 413 }
 414
 415 static int is_duplicate(struct ib_umad_file *file,
 416                         struct ib_umad_packet *packet)
 417 {
 418         struct ib_umad_packet *sent_packet;
 419         struct ib_mad_hdr *sent_hdr, *hdr;
 420
 421         hdr = (struct ib_mad_hdr *) packet->mad.data;
 422         list_for_each_entry(sent_packet, &file->send_list, list) {
 423                 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
 424
 425                 if ((hdr->tid != sent_hdr->tid) ||
 426                     (hdr->mgmt_class != sent_hdr->mgmt_class))
 427                         continue;
 428
 429                 /*
 430                  * No need to be overly clever here.  If two new operations have
 431                  * the same TID, reject the second as a duplicate.  This is more
 432                  * restrictive than required by the spec.
 433                  */
 434                 if (!ib_response_mad(hdr)) {
 435                         if (!ib_response_mad(sent_hdr))
 436                                 return 1;
 437                         continue;
 438                 } else if (!ib_response_mad(sent_hdr))
 439                         continue;
 440
 441                 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
 442                         return 1;
 443         }
 444
 445         return 0;
 446 }
 447
 448 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
 449                              size_t count, loff_t *pos)
 450 {
 451         struct ib_umad_file *file = filp->private_data;
 452         struct ib_umad_packet *packet;
 453         struct ib_mad_agent *agent;
 454         struct rdma_ah_attr ah_attr;
 455         struct ib_ah *ah;
 456         struct ib_rmpp_mad *rmpp_mad;
 457         __be64 *tid;
 458         int ret, data_len, hdr_len, copy_offset, rmpp_active;
 459         u8 base_version;
 460
 461         if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
 462                 return -EINVAL;
 463
 464         packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
 465         if (!packet)
 466                 return -ENOMEM;
 467
 468         if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
 469                 ret = -EFAULT;
 470                 goto err;
 471         }
 472
 473         if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
 474                 ret = -EINVAL;
 475                 goto err;
 476         }
 477
 478         buf += hdr_size(file);
 479
 480         if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
 481                 ret = -EFAULT;
 482                 goto err;
 483         }
 484
 485         mutex_lock(&file->mutex);
 486
 487         agent = __get_agent(file, packet->mad.hdr.id);
 488         if (!agent) {
 489                 ret = -EINVAL;
 490                 goto err_up;
 491         }
 492
 493         memset(&ah_attr, 0, sizeof ah_attr);
 494         ah_attr.type = rdma_ah_find_type(file->port->ib_dev,
 495                                          file->port->port_num);
 496         rdma_ah_set_dlid(&ah_attr, be16_to_cpu(packet->mad.hdr.lid));
 497         rdma_ah_set_sl(&ah_attr, packet->mad.hdr.sl);
 498         rdma_ah_set_path_bits(&ah_attr, packet->mad.hdr.path_bits);
 499         rdma_ah_set_port_num(&ah_attr, file->port->port_num);
 500         if (packet->mad.hdr.grh_present) {
 501                 rdma_ah_set_grh(&ah_attr, NULL,
 502                                 be32_to_cpu(packet->mad.hdr.flow_label),
 503                                 packet->mad.hdr.gid_index,
 504                                 packet->mad.hdr.hop_limit,
 505                                 packet->mad.hdr.traffic_class);
 506                 rdma_ah_set_dgid_raw(&ah_attr, packet->mad.hdr.gid);
 507         }
 508
 509         ah = rdma_create_ah(agent->qp->pd, &ah_attr);
 510         if (IS_ERR(ah)) {
 511                 ret = PTR_ERR(ah);
 512                 goto err_up;
 513         }
 514
 515         rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
 516         hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
 517
 518         if (ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
 519             && ib_mad_kernel_rmpp_agent(agent)) {
 520                 copy_offset = IB_MGMT_RMPP_HDR;
 521                 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 522                                                 IB_MGMT_RMPP_FLAG_ACTIVE;
 523         } else {
 524                 copy_offset = IB_MGMT_MAD_HDR;
 525                 rmpp_active = 0;
 526         }
 527
 528         base_version = ((struct ib_mad_hdr *)&packet->mad.data)->base_version;
 529         data_len = count - hdr_size(file) - hdr_len;
 530         packet->msg = ib_create_send_mad(agent,
 531                                          be32_to_cpu(packet->mad.hdr.qpn),
 532                                          packet->mad.hdr.pkey_index, rmpp_active,
 533                                          hdr_len, data_len, GFP_KERNEL,
 534                                          base_version);
 535         if (IS_ERR(packet->msg)) {
 536                 ret = PTR_ERR(packet->msg);
 537                 goto err_ah;
 538         }
 539
 540         packet->msg->ah         = ah;
 541         packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
 542         packet->msg->retries    = packet->mad.hdr.retries;
 543         packet->msg->context[0] = packet;
 544
 545         /* Copy MAD header.  Any RMPP header is already in place. */
 546         memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
 547
 548         if (!rmpp_active) {
 549                 if (copy_from_user(packet->msg->mad + copy_offset,
 550                                    buf + copy_offset,
 551                                    hdr_len + data_len - copy_offset)) {
 552                         ret = -EFAULT;
 553                         goto err_msg;
 554                 }
 555         } else {
 556                 ret = copy_rmpp_mad(packet->msg, buf);
 557                 if (ret)
 558                         goto err_msg;
 559         }
 560
 561         /*
 562          * Set the high-order part of the transaction ID to make MADs from
 563          * different agents unique, and allow routing responses back to the
 564          * original requestor.
 565          */
 566         if (!ib_response_mad(packet->msg->mad)) {
 567                 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
 568                 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
 569                                    (be64_to_cpup(tid) & 0xffffffff));
 570                 rmpp_mad->mad_hdr.tid = *tid;
 571         }
 572
 573         if (!ib_mad_kernel_rmpp_agent(agent)
 574            && ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
 575            && (ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE)) {
 576                 spin_lock_irq(&file->send_lock);
 577                 list_add_tail(&packet->list, &file->send_list);
 578                 spin_unlock_irq(&file->send_lock);
 579         } else {
 580                 spin_lock_irq(&file->send_lock);
 581                 ret = is_duplicate(file, packet);
 582                 if (!ret)
 583                         list_add_tail(&packet->list, &file->send_list);
 584                 spin_unlock_irq(&file->send_lock);
 585                 if (ret) {
 586                         ret = -EINVAL;
 587                         goto err_msg;
 588                 }
 589         }
 590
 591         ret = ib_post_send_mad(packet->msg, NULL);
 592         if (ret)
 593                 goto err_send;
 594
 595         mutex_unlock(&file->mutex);
 596         return count;
 597
 598 err_send:
 599         dequeue_send(file, packet);
 600 err_msg:
 601         ib_free_send_mad(packet->msg);
 602 err_ah:
 603         rdma_destroy_ah(ah);
 604 err_up:
 605         mutex_unlock(&file->mutex);
 606 err:
 607         kfree(packet);
 608         return ret;
 609 }
 610
 611 static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
 612 {
 613         struct ib_umad_file *file = filp->private_data;
 614
 615         /* we will always be able to post a MAD send */
 616         unsigned int mask = POLLOUT | POLLWRNORM;
 617
 618         poll_wait(filp, &file->recv_wait, wait);
 619
 620         if (!list_empty(&file->recv_list))
 621                 mask |= POLLIN | POLLRDNORM;
 622
 623         return mask;
 624 }
 625
 626 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
 627                              int compat_method_mask)
 628 {
 629         struct ib_user_mad_reg_req ureq;
 630         struct ib_mad_reg_req req;
 631         struct ib_mad_agent *agent = NULL;
 632         int agent_id;
 633         int ret;
 634
 635         mutex_lock(&file->port->file_mutex);
 636         mutex_lock(&file->mutex);
 637
 638         if (!file->port->ib_dev) {
 639                 dev_notice(file->port->dev,
 640                            "ib_umad_reg_agent: invalid device\n");
 641                 ret = -EPIPE;
 642                 goto out;
 643         }
 644
 645         if (copy_from_user(&ureq, arg, sizeof ureq)) {
 646                 ret = -EFAULT;
 647                 goto out;
 648         }
 649
 650         if (ureq.qpn != 0 && ureq.qpn != 1) {
 651                 dev_notice(file->port->dev,
 652                            "ib_umad_reg_agent: invalid QPN %d specified\n",
 653                            ureq.qpn);
 654                 ret = -EINVAL;
 655                 goto out;
 656         }
 657
 658         for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
 659                 if (!__get_agent(file, agent_id))
 660                         goto found;
 661
 662         dev_notice(file->port->dev,
 663                    "ib_umad_reg_agent: Max Agents (%u) reached\n",
 664                    IB_UMAD_MAX_AGENTS);
 665         ret = -ENOMEM;
 666         goto out;
 667
 668 found:
 669         if (ureq.mgmt_class) {
 670                 memset(&req, 0, sizeof(req));
 671                 req.mgmt_class         = ureq.mgmt_class;
 672                 req.mgmt_class_version = ureq.mgmt_class_version;
 673                 memcpy(req.oui, ureq.oui, sizeof req.oui);
 674
 675                 if (compat_method_mask) {
 676                         u32 *umm = (u32 *) ureq.method_mask;
 677                         int i;
 678
 679                         for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
 680                                 req.method_mask[i] =
 681                                         umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
 682                 } else
 683                         memcpy(req.method_mask, ureq.method_mask,
 684                                sizeof req.method_mask);
 685         }
 686
 687         agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
 688                                       ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
 689                                       ureq.mgmt_class ? &req : NULL,
 690                                       ureq.rmpp_version,
 691                                       send_handler, recv_handler, file, 0);
 692         if (IS_ERR(agent)) {
 693                 ret = PTR_ERR(agent);
 694                 agent = NULL;
 695                 goto out;
 696         }
 697
 698         if (put_user(agent_id,
 699                      (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
 700                 ret = -EFAULT;
 701                 goto out;
 702         }
 703
 704         if (!file->already_used) {
 705                 file->already_used = 1;
 706                 if (!file->use_pkey_index) {
 707                         dev_warn(file->port->dev,
 708                                 "process %s did not enable P_Key index support.\n",
 709                                 current->comm);
 710                         dev_warn(file->port->dev,
 711                                 "   Documentation/infiniband/user_mad.txt has info on the new ABI.\n");
 712                 }
 713         }
 714
 715         file->agent[agent_id] = agent;
 716         ret = 0;
 717
 718 out:
 719         mutex_unlock(&file->mutex);
 720
 721         if (ret && agent)
 722                 ib_unregister_mad_agent(agent);
 723
 724         mutex_unlock(&file->port->file_mutex);
 725
 726         return ret;
 727 }
 728
 729 static int ib_umad_reg_agent2(struct ib_umad_file *file, void __user *arg)
 730 {
 731         struct ib_user_mad_reg_req2 ureq;
 732         struct ib_mad_reg_req req;
 733         struct ib_mad_agent *agent = NULL;
 734         int agent_id;
 735         int ret;
 736
 737         mutex_lock(&file->port->file_mutex);
 738         mutex_lock(&file->mutex);
 739
 740         if (!file->port->ib_dev) {
 741                 dev_notice(file->port->dev,
 742                            "ib_umad_reg_agent2: invalid device\n");
 743                 ret = -EPIPE;
 744                 goto out;
 745         }
 746
 747         if (copy_from_user(&ureq, arg, sizeof(ureq))) {
 748                 ret = -EFAULT;
 749                 goto out;
 750         }
 751
 752         if (ureq.qpn != 0 && ureq.qpn != 1) {
 753                 dev_notice(file->port->dev,
 754                            "ib_umad_reg_agent2: invalid QPN %d specified\n",
 755                            ureq.qpn);
 756                 ret = -EINVAL;
 757                 goto out;
 758         }
 759
 760         if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) {
 761                 dev_notice(file->port->dev,
 762                            "ib_umad_reg_agent2 failed: invalid registration flags specified 0x%x; supported 0x%x\n",
 763                            ureq.flags, IB_USER_MAD_REG_FLAGS_CAP);
 764                 ret = -EINVAL;
 765
 766                 if (put_user((u32)IB_USER_MAD_REG_FLAGS_CAP,
 767                                 (u32 __user *) (arg + offsetof(struct
 768                                 ib_user_mad_reg_req2, flags))))
 769                         ret = -EFAULT;
 770
 771                 goto out;
 772         }
 773
 774         for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
 775                 if (!__get_agent(file, agent_id))
 776                         goto found;
 777
 778         dev_notice(file->port->dev,
 779                    "ib_umad_reg_agent2: Max Agents (%u) reached\n",
 780                    IB_UMAD_MAX_AGENTS);
 781         ret = -ENOMEM;
 782         goto out;
 783
 784 found:
 785         if (ureq.mgmt_class) {
 786                 memset(&req, 0, sizeof(req));
 787                 req.mgmt_class         = ureq.mgmt_class;
 788                 req.mgmt_class_version = ureq.mgmt_class_version;
 789                 if (ureq.oui & 0xff000000) {
 790                         dev_notice(file->port->dev,
 791                                    "ib_umad_reg_agent2 failed: oui invalid 0x%08x\n",
 792                                    ureq.oui);
 793                         ret = -EINVAL;
 794                         goto out;
 795                 }
 796                 req.oui[2] =  ureq.oui & 0x0000ff;
 797                 req.oui[1] = (ureq.oui & 0x00ff00) >> 8;
 798                 req.oui[0] = (ureq.oui & 0xff0000) >> 16;
 799                 memcpy(req.method_mask, ureq.method_mask,
 800                         sizeof(req.method_mask));
 801         }
 802
 803         agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
 804                                       ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
 805                                       ureq.mgmt_class ? &req : NULL,
 806                                       ureq.rmpp_version,
 807                                       send_handler, recv_handler, file,
 808                                       ureq.flags);
 809         if (IS_ERR(agent)) {
 810                 ret = PTR_ERR(agent);
 811                 agent = NULL;
 812                 goto out;
 813         }
 814
 815         if (put_user(agent_id,
 816                      (u32 __user *)(arg +
 817                                 offsetof(struct ib_user_mad_reg_req2, id)))) {
 818                 ret = -EFAULT;
 819                 goto out;
 820         }
 821
 822         if (!file->already_used) {
 823                 file->already_used = 1;
 824                 file->use_pkey_index = 1;
 825         }
 826
 827         file->agent[agent_id] = agent;
 828         ret = 0;
 829
 830 out:
 831         mutex_unlock(&file->mutex);
 832
 833         if (ret && agent)
 834                 ib_unregister_mad_agent(agent);
 835
 836         mutex_unlock(&file->port->file_mutex);
 837
 838         return ret;
 839 }
 840
 841
 842 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
 843 {
 844         struct ib_mad_agent *agent = NULL;
 845         u32 id;
 846         int ret = 0;
 847
 848         if (get_user(id, arg))
 849                 return -EFAULT;
 850
 851         mutex_lock(&file->port->file_mutex);
 852         mutex_lock(&file->mutex);
 853
 854         if (id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
 855                 ret = -EINVAL;
 856                 goto out;
 857         }
 858
 859         agent = file->agent[id];
 860         file->agent[id] = NULL;
 861
 862 out:
 863         mutex_unlock(&file->mutex);
 864
 865         if (agent)
 866                 ib_unregister_mad_agent(agent);
 867
 868         mutex_unlock(&file->port->file_mutex);
 869
 870         return ret;
 871 }
 872
 873 static long ib_umad_enable_pkey(struct ib_umad_file *file)
 874 {
 875         int ret = 0;
 876
 877         mutex_lock(&file->mutex);
 878         if (file->already_used)
 879                 ret = -EINVAL;
 880         else
 881                 file->use_pkey_index = 1;
 882         mutex_unlock(&file->mutex);
 883
 884         return ret;
 885 }
 886
 887 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
 888                           unsigned long arg)
 889 {
 890         switch (cmd) {
 891         case IB_USER_MAD_REGISTER_AGENT:
 892                 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
 893         case IB_USER_MAD_UNREGISTER_AGENT:
 894                 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
 895         case IB_USER_MAD_ENABLE_PKEY:
 896                 return ib_umad_enable_pkey(filp->private_data);
 897         case IB_USER_MAD_REGISTER_AGENT2:
 898                 return ib_umad_reg_agent2(filp->private_data, (void __user *) arg);
 899         default:
 900                 return -ENOIOCTLCMD;
 901         }
 902 }
 903
 904 #ifdef CONFIG_COMPAT
 905 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
 906                                  unsigned long arg)
 907 {
 908         switch (cmd) {
 909         case IB_USER_MAD_REGISTER_AGENT:
 910                 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
 911         case IB_USER_MAD_UNREGISTER_AGENT:
 912                 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
 913         case IB_USER_MAD_ENABLE_PKEY:
 914                 return ib_umad_enable_pkey(filp->private_data);
 915         case IB_USER_MAD_REGISTER_AGENT2:
 916                 return ib_umad_reg_agent2(filp->private_data, compat_ptr(arg));
 917         default:
 918                 return -ENOIOCTLCMD;
 919         }
 920 }
 921 #endif
 922
 923 /*
 924  * ib_umad_open() does not need the BKL:
 925  *
 926  *  - the ib_umad_port structures are properly reference counted, and
 927  *    everything else is purely local to the file being created, so
 928  *    races against other open calls are not a problem;
 929  *  - the ioctl method does not affect any global state outside of the
 930  *    file structure being operated on;
 931  */
 932 static int ib_umad_open(struct inode *inode, struct file *filp)
 933 {
 934         struct ib_umad_port *port;
 935         struct ib_umad_file *file;
 936         int ret = -ENXIO;
 937
 938         port = container_of(inode->i_cdev, struct ib_umad_port, cdev);
 939
 940         mutex_lock(&port->file_mutex);
 941
 942         if (!port->ib_dev)
 943                 goto out;
 944
 945         ret = -ENOMEM;
 946         file = kzalloc(sizeof *file, GFP_KERNEL);
 947         if (!file)
 948                 goto out;
 949
 950         mutex_init(&file->mutex);
 951         spin_lock_init(&file->send_lock);
 952         INIT_LIST_HEAD(&file->recv_list);
 953         INIT_LIST_HEAD(&file->send_list);
 954         init_waitqueue_head(&file->recv_wait);
 955
 956         file->port = port;
 957         filp->private_data = file;
 958
 959         list_add_tail(&file->port_list, &port->file_list);
 960
 961         ret = nonseekable_open(inode, filp);
 962         if (ret) {
 963                 list_del(&file->port_list);
 964                 kfree(file);
 965                 goto out;
 966         }
 967
 968         kobject_get(&port->umad_dev->kobj);
 969
 970 out:
 971         mutex_unlock(&port->file_mutex);
 972         return ret;
 973 }
 974
 975 static int ib_umad_close(struct inode *inode, struct file *filp)
 976 {
 977         struct ib_umad_file *file = filp->private_data;
 978         struct ib_umad_device *dev = file->port->umad_dev;
 979         struct ib_umad_packet *packet, *tmp;
 980         int already_dead;
 981         int i;
 982
 983         mutex_lock(&file->port->file_mutex);
 984         mutex_lock(&file->mutex);
 985
 986         already_dead = file->agents_dead;
 987         file->agents_dead = 1;
 988
 989         list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
 990                 if (packet->recv_wc)
 991                         ib_free_recv_mad(packet->recv_wc);
 992                 kfree(packet);
 993         }
 994
 995         list_del(&file->port_list);
 996
 997         mutex_unlock(&file->mutex);
 998
 999         if (!already_dead)
1000                 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
1001                         if (file->agent[i])
1002                                 ib_unregister_mad_agent(file->agent[i]);
1003
1004         mutex_unlock(&file->port->file_mutex);
1005
1006         kfree(file);
1007         kobject_put(&dev->kobj);
1008
1009         return 0;
1010 }
1011
1012 static const struct file_operations umad_fops = {
1013         .owner          = THIS_MODULE,
1014         .read           = ib_umad_read,
1015         .write          = ib_umad_write,
1016         .poll           = ib_umad_poll,
1017         .unlocked_ioctl = ib_umad_ioctl,
1018 #ifdef CONFIG_COMPAT
1019         .compat_ioctl   = ib_umad_compat_ioctl,
1020 #endif
1021         .open           = ib_umad_open,
1022         .release        = ib_umad_close,
1023         .llseek         = no_llseek,
1024 };
1025
1026 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
1027 {
1028         struct ib_umad_port *port;
1029         struct ib_port_modify props = {
1030                 .set_port_cap_mask = IB_PORT_SM
1031         };
1032         int ret;
1033
1034         port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev);
1035
1036         if (filp->f_flags & O_NONBLOCK) {
1037                 if (down_trylock(&port->sm_sem)) {
1038                         ret = -EAGAIN;
1039                         goto fail;
1040                 }
1041         } else {
1042                 if (down_interruptible(&port->sm_sem)) {
1043                         ret = -ERESTARTSYS;
1044                         goto fail;
1045                 }
1046         }
1047
1048         ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1049         if (ret)
1050                 goto err_up_sem;
1051
1052         filp->private_data = port;
1053
1054         ret = nonseekable_open(inode, filp);
1055         if (ret)
1056                 goto err_clr_sm_cap;
1057
1058         kobject_get(&port->umad_dev->kobj);
1059
1060         return 0;
1061
1062 err_clr_sm_cap:
1063         swap(props.set_port_cap_mask, props.clr_port_cap_mask);
1064         ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1065
1066 err_up_sem:
1067         up(&port->sm_sem);
1068
1069 fail:
1070         return ret;
1071 }
1072
1073 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
1074 {
1075         struct ib_umad_port *port = filp->private_data;
1076         struct ib_port_modify props = {
1077                 .clr_port_cap_mask = IB_PORT_SM
1078         };
1079         int ret = 0;
1080
1081         mutex_lock(&port->file_mutex);
1082         if (port->ib_dev)
1083                 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1084         mutex_unlock(&port->file_mutex);
1085
1086         up(&port->sm_sem);
1087
1088         kobject_put(&port->umad_dev->kobj);
1089
1090         return ret;
1091 }
1092
1093 static const struct file_operations umad_sm_fops = {
1094         .owner   = THIS_MODULE,
1095         .open    = ib_umad_sm_open,
1096         .release = ib_umad_sm_close,
1097         .llseek  = no_llseek,
1098 };
1099
1100 static struct ib_client umad_client = {
1101         .name   = "umad",
1102         .add    = ib_umad_add_one,
1103         .remove = ib_umad_remove_one
1104 };
1105
1106 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
1107                           char *buf)
1108 {
1109         struct ib_umad_port *port = dev_get_drvdata(dev);
1110
1111         if (!port)
1112                 return -ENODEV;
1113
1114         return sprintf(buf, "%s\n", port->ib_dev->name);
1115 }
1116 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1117
1118 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
1119                          char *buf)
1120 {
1121         struct ib_umad_port *port = dev_get_drvdata(dev);
1122
1123         if (!port)
1124                 return -ENODEV;
1125
1126         return sprintf(buf, "%d\n", port->port_num);
1127 }
1128 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1129
1130 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1131                          __stringify(IB_USER_MAD_ABI_VERSION));
1132
1133 static dev_t overflow_maj;
1134 static DECLARE_BITMAP(overflow_map, IB_UMAD_MAX_PORTS);
1135 static int find_overflow_devnum(struct ib_device *device)
1136 {
1137         int ret;
1138
1139         if (!overflow_maj) {
1140                 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UMAD_MAX_PORTS * 2,
1141                                           "infiniband_mad");
1142                 if (ret) {
1143                         dev_err(&device->dev,
1144                                 "couldn't register dynamic device number\n");
1145                         return ret;
1146                 }
1147         }
1148
1149         ret = find_first_zero_bit(overflow_map, IB_UMAD_MAX_PORTS);
1150         if (ret >= IB_UMAD_MAX_PORTS)
1151                 return -1;
1152
1153         return ret;
1154 }
1155
1156 static int ib_umad_init_port(struct ib_device *device, int port_num,
1157                              struct ib_umad_device *umad_dev,
1158                              struct ib_umad_port *port)
1159 {
1160         int devnum;
1161         dev_t base;
1162
1163         spin_lock(&port_lock);
1164         devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
1165         if (devnum >= IB_UMAD_MAX_PORTS) {
1166                 spin_unlock(&port_lock);
1167                 devnum = find_overflow_devnum(device);
1168                 if (devnum < 0)
1169                         return -1;
1170
1171                 spin_lock(&port_lock);
1172                 port->dev_num = devnum + IB_UMAD_MAX_PORTS;
1173                 base = devnum + overflow_maj;
1174                 set_bit(devnum, overflow_map);
1175         } else {
1176                 port->dev_num = devnum;
1177                 base = devnum + base_dev;
1178                 set_bit(devnum, dev_map);
1179         }
1180         spin_unlock(&port_lock);
1181
1182         port->ib_dev   = device;
1183         port->port_num = port_num;
1184         sema_init(&port->sm_sem, 1);
1185         mutex_init(&port->file_mutex);
1186         INIT_LIST_HEAD(&port->file_list);
1187
1188         cdev_init(&port->cdev, &umad_fops);
1189         port->cdev.owner = THIS_MODULE;
1190         cdev_set_parent(&port->cdev, &umad_dev->kobj);
1191         kobject_set_name(&port->cdev.kobj, "umad%d", port->dev_num);
1192         if (cdev_add(&port->cdev, base, 1))
1193                 goto err_cdev;
1194
1195         port->dev = device_create(umad_class, device->dev.parent,
1196                                   port->cdev.dev, port,
1197                                   "umad%d", port->dev_num);
1198         if (IS_ERR(port->dev))
1199                 goto err_cdev;
1200
1201         if (device_create_file(port->dev, &dev_attr_ibdev))
1202                 goto err_dev;
1203         if (device_create_file(port->dev, &dev_attr_port))
1204                 goto err_dev;
1205
1206         base += IB_UMAD_MAX_PORTS;
1207         cdev_init(&port->sm_cdev, &umad_sm_fops);
1208         port->sm_cdev.owner = THIS_MODULE;
1209         cdev_set_parent(&port->sm_cdev, &umad_dev->kobj);
1210         kobject_set_name(&port->sm_cdev.kobj, "issm%d", port->dev_num);
1211         if (cdev_add(&port->sm_cdev, base, 1))
1212                 goto err_sm_cdev;
1213
1214         port->sm_dev = device_create(umad_class, device->dev.parent,
1215                                      port->sm_cdev.dev, port,
1216                                      "issm%d", port->dev_num);
1217         if (IS_ERR(port->sm_dev))
1218                 goto err_sm_cdev;
1219
1220         if (device_create_file(port->sm_dev, &dev_attr_ibdev))
1221                 goto err_sm_dev;
1222         if (device_create_file(port->sm_dev, &dev_attr_port))
1223                 goto err_sm_dev;
1224
1225         return 0;
1226
1227 err_sm_dev:
1228         device_destroy(umad_class, port->sm_cdev.dev);
1229
1230 err_sm_cdev:
1231         cdev_del(&port->sm_cdev);
1232
1233 err_dev:
1234         device_destroy(umad_class, port->cdev.dev);
1235
1236 err_cdev:
1237         cdev_del(&port->cdev);
1238         if (port->dev_num < IB_UMAD_MAX_PORTS)
1239                 clear_bit(devnum, dev_map);
1240         else
1241                 clear_bit(devnum, overflow_map);
1242
1243         return -1;
1244 }
1245
1246 static void ib_umad_kill_port(struct ib_umad_port *port)
1247 {
1248         struct ib_umad_file *file;
1249         int id;
1250
1251         dev_set_drvdata(port->dev,    NULL);
1252         dev_set_drvdata(port->sm_dev, NULL);
1253
1254         device_destroy(umad_class, port->cdev.dev);
1255         device_destroy(umad_class, port->sm_cdev.dev);
1256
1257         cdev_del(&port->cdev);
1258         cdev_del(&port->sm_cdev);
1259
1260         mutex_lock(&port->file_mutex);
1261
1262         port->ib_dev = NULL;
1263
1264         list_for_each_entry(file, &port->file_list, port_list) {
1265                 mutex_lock(&file->mutex);
1266                 file->agents_dead = 1;
1267                 mutex_unlock(&file->mutex);
1268
1269                 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1270                         if (file->agent[id])
1271                                 ib_unregister_mad_agent(file->agent[id]);
1272         }
1273
1274         mutex_unlock(&port->file_mutex);
1275
1276         if (port->dev_num < IB_UMAD_MAX_PORTS)
1277                 clear_bit(port->dev_num, dev_map);
1278         else
1279                 clear_bit(port->dev_num - IB_UMAD_MAX_PORTS, overflow_map);
1280 }
1281
1282 static void ib_umad_add_one(struct ib_device *device)
1283 {
1284         struct ib_umad_device *umad_dev;
1285         int s, e, i;
1286         int count = 0;
1287
1288         s = rdma_start_port(device);
1289         e = rdma_end_port(device);
1290
1291         umad_dev = kzalloc(sizeof *umad_dev +
1292                            (e - s + 1) * sizeof (struct ib_umad_port),
1293                            GFP_KERNEL);
1294         if (!umad_dev)
1295                 return;
1296
1297         kobject_init(&umad_dev->kobj, &ib_umad_dev_ktype);
1298
1299         for (i = s; i <= e; ++i) {
1300                 if (!rdma_cap_ib_mad(device, i))
1301                         continue;
1302
1303                 umad_dev->port[i - s].umad_dev = umad_dev;
1304
1305                 if (ib_umad_init_port(device, i, umad_dev,
1306                                       &umad_dev->port[i - s]))
1307                         goto err;
1308
1309                 count++;
1310         }
1311
1312         if (!count)
1313                 goto free;
1314
1315         ib_set_client_data(device, &umad_client, umad_dev);
1316
1317         return;
1318
1319 err:
1320         while (--i >= s) {
1321                 if (!rdma_cap_ib_mad(device, i))
1322                         continue;
1323
1324                 ib_umad_kill_port(&umad_dev->port[i - s]);
1325         }
1326 free:
1327         kobject_put(&umad_dev->kobj);
1328 }
1329
1330 static void ib_umad_remove_one(struct ib_device *device, void *client_data)
1331 {
1332         struct ib_umad_device *umad_dev = client_data;
1333         int i;
1334
1335         if (!umad_dev)
1336                 return;
1337
1338         for (i = 0; i <= rdma_end_port(device) - rdma_start_port(device); ++i) {
1339                 if (rdma_cap_ib_mad(device, i + rdma_start_port(device)))
1340                         ib_umad_kill_port(&umad_dev->port[i]);
1341         }
1342
1343         kobject_put(&umad_dev->kobj);
1344 }
1345
1346 static char *umad_devnode(struct device *dev, umode_t *mode)
1347 {
1348         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1349 }
1350
1351 static int __init ib_umad_init(void)
1352 {
1353         int ret;
1354
1355         ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
1356                                      "infiniband_mad");
1357         if (ret) {
1358                 pr_err("couldn't register device number\n");
1359                 goto out;
1360         }
1361
1362         umad_class = class_create(THIS_MODULE, "infiniband_mad");
1363         if (IS_ERR(umad_class)) {
1364                 ret = PTR_ERR(umad_class);
1365                 pr_err("couldn't create class infiniband_mad\n");
1366                 goto out_chrdev;
1367         }
1368
1369         umad_class->devnode = umad_devnode;
1370
1371         ret = class_create_file(umad_class, &class_attr_abi_version.attr);
1372         if (ret) {
1373                 pr_err("couldn't create abi_version attribute\n");
1374                 goto out_class;
1375         }
1376
1377         ret = ib_register_client(&umad_client);
1378         if (ret) {
1379                 pr_err("couldn't register ib_umad client\n");
1380                 goto out_class;
1381         }
1382
1383         return 0;
1384
1385 out_class:
1386         class_destroy(umad_class);
1387
1388 out_chrdev:
1389         unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 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_dev, IB_UMAD_MAX_PORTS * 2);
1400         if (overflow_maj)
1401                 unregister_chrdev_region(overflow_maj, IB_UMAD_MAX_PORTS * 2);
1402 }
1403
1404 module_init(ib_umad_init);
1405 module_exit(ib_umad_cleanup);