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         /*
 233          * On OPA devices it is okay to lose the upper 16 bits of LID as this
 234          * information is obtained elsewhere. Mask off the upper 16 bits.
 235          */
 236         if (agent->device->port_immutable[agent->port_num].core_cap_flags &
 237             RDMA_CORE_PORT_INTEL_OPA)
 238                 packet->mad.hdr.lid = ib_lid_be16(0xFFFF &
 239                                                   mad_recv_wc->wc->slid);
 240         else
 241                 packet->mad.hdr.lid = ib_lid_be16(mad_recv_wc->wc->slid);
 242         packet->mad.hdr.sl         = mad_recv_wc->wc->sl;
 243         packet->mad.hdr.path_bits  = mad_recv_wc->wc->dlid_path_bits;
 244         packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;
 245         packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
 246         if (packet->mad.hdr.grh_present) {
 247                 struct rdma_ah_attr ah_attr;
 248                 const struct ib_global_route *grh;
 249
 250                 ib_init_ah_from_wc(agent->device, agent->port_num,
 251                                    mad_recv_wc->wc, mad_recv_wc->recv_buf.grh,
 252                                    &ah_attr);
 253
 254                 grh = rdma_ah_read_grh(&ah_attr);
 255                 packet->mad.hdr.gid_index = grh->sgid_index;
 256                 packet->mad.hdr.hop_limit = grh->hop_limit;
 257                 packet->mad.hdr.traffic_class = grh->traffic_class;
 258                 memcpy(packet->mad.hdr.gid, &grh->dgid, 16);
 259                 packet->mad.hdr.flow_label = cpu_to_be32(grh->flow_label);
 260         }
 261
 262         if (queue_packet(file, agent, packet))
 263                 goto err2;
 264         return;
 265
 266 err2:
 267         kfree(packet);
 268 err1:
 269         ib_free_recv_mad(mad_recv_wc);
 270 }
 271
 272 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
 273                              struct ib_umad_packet *packet, size_t count)
 274 {
 275         struct ib_mad_recv_buf *recv_buf;
 276         int left, seg_payload, offset, max_seg_payload;
 277         size_t seg_size;
 278
 279         recv_buf = &packet->recv_wc->recv_buf;
 280         seg_size = packet->recv_wc->mad_seg_size;
 281
 282         /* We need enough room to copy the first (or only) MAD segment. */
 283         if ((packet->length <= seg_size &&
 284              count < hdr_size(file) + packet->length) ||
 285             (packet->length > seg_size &&
 286              count < hdr_size(file) + seg_size))
 287                 return -EINVAL;
 288
 289         if (copy_to_user(buf, &packet->mad, hdr_size(file)))
 290                 return -EFAULT;
 291
 292         buf += hdr_size(file);
 293         seg_payload = min_t(int, packet->length, seg_size);
 294         if (copy_to_user(buf, recv_buf->mad, seg_payload))
 295                 return -EFAULT;
 296
 297         if (seg_payload < packet->length) {
 298                 /*
 299                  * Multipacket RMPP MAD message. Copy remainder of message.
 300                  * Note that last segment may have a shorter payload.
 301                  */
 302                 if (count < hdr_size(file) + packet->length) {
 303                         /*
 304                          * The buffer is too small, return the first RMPP segment,
 305                          * which includes the RMPP message length.
 306                          */
 307                         return -ENOSPC;
 308                 }
 309                 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
 310                 max_seg_payload = seg_size - offset;
 311
 312                 for (left = packet->length - seg_payload, buf += seg_payload;
 313                      left; left -= seg_payload, buf += seg_payload) {
 314                         recv_buf = container_of(recv_buf->list.next,
 315                                                 struct ib_mad_recv_buf, list);
 316                         seg_payload = min(left, max_seg_payload);
 317                         if (copy_to_user(buf, ((void *) recv_buf->mad) + offset,
 318                                          seg_payload))
 319                                 return -EFAULT;
 320                 }
 321         }
 322         return hdr_size(file) + packet->length;
 323 }
 324
 325 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
 326                              struct ib_umad_packet *packet, size_t count)
 327 {
 328         ssize_t size = hdr_size(file) + packet->length;
 329
 330         if (count < size)
 331                 return -EINVAL;
 332
 333         if (copy_to_user(buf, &packet->mad, hdr_size(file)))
 334                 return -EFAULT;
 335
 336         buf += hdr_size(file);
 337
 338         if (copy_to_user(buf, packet->mad.data, packet->length))
 339                 return -EFAULT;
 340
 341         return size;
 342 }
 343
 344 static ssize_t ib_umad_read(struct file *filp, char __user *buf,
 345                             size_t count, loff_t *pos)
 346 {
 347         struct ib_umad_file *file = filp->private_data;
 348         struct ib_umad_packet *packet;
 349         ssize_t ret;
 350
 351         if (count < hdr_size(file))
 352                 return -EINVAL;
 353
 354         mutex_lock(&file->mutex);
 355
 356         while (list_empty(&file->recv_list)) {
 357                 mutex_unlock(&file->mutex);
 358
 359                 if (filp->f_flags & O_NONBLOCK)
 360                         return -EAGAIN;
 361
 362                 if (wait_event_interruptible(file->recv_wait,
 363                                              !list_empty(&file->recv_list)))
 364                         return -ERESTARTSYS;
 365
 366                 mutex_lock(&file->mutex);
 367         }
 368
 369         packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
 370         list_del(&packet->list);
 371
 372         mutex_unlock(&file->mutex);
 373
 374         if (packet->recv_wc)
 375                 ret = copy_recv_mad(file, buf, packet, count);
 376         else
 377                 ret = copy_send_mad(file, buf, packet, count);
 378
 379         if (ret < 0) {
 380                 /* Requeue packet */
 381                 mutex_lock(&file->mutex);
 382                 list_add(&packet->list, &file->recv_list);
 383                 mutex_unlock(&file->mutex);
 384         } else {
 385                 if (packet->recv_wc)
 386                         ib_free_recv_mad(packet->recv_wc);
 387                 kfree(packet);
 388         }
 389         return ret;
 390 }
 391
 392 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
 393 {
 394         int left, seg;
 395
 396         /* Copy class specific header */
 397         if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
 398             copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
 399                            msg->hdr_len - IB_MGMT_RMPP_HDR))
 400                 return -EFAULT;
 401
 402         /* All headers are in place.  Copy data segments. */
 403         for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
 404              seg++, left -= msg->seg_size, buf += msg->seg_size) {
 405                 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
 406                                    min(left, msg->seg_size)))
 407                         return -EFAULT;
 408         }
 409         return 0;
 410 }
 411
 412 static int same_destination(struct ib_user_mad_hdr *hdr1,
 413                             struct ib_user_mad_hdr *hdr2)
 414 {
 415         if (!hdr1->grh_present && !hdr2->grh_present)
 416            return (hdr1->lid == hdr2->lid);
 417
 418         if (hdr1->grh_present && hdr2->grh_present)
 419            return !memcmp(hdr1->gid, hdr2->gid, 16);
 420
 421         return 0;
 422 }
 423
 424 static int is_duplicate(struct ib_umad_file *file,
 425                         struct ib_umad_packet *packet)
 426 {
 427         struct ib_umad_packet *sent_packet;
 428         struct ib_mad_hdr *sent_hdr, *hdr;
 429
 430         hdr = (struct ib_mad_hdr *) packet->mad.data;
 431         list_for_each_entry(sent_packet, &file->send_list, list) {
 432                 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
 433
 434                 if ((hdr->tid != sent_hdr->tid) ||
 435                     (hdr->mgmt_class != sent_hdr->mgmt_class))
 436                         continue;
 437
 438                 /*
 439                  * No need to be overly clever here.  If two new operations have
 440                  * the same TID, reject the second as a duplicate.  This is more
 441                  * restrictive than required by the spec.
 442                  */
 443                 if (!ib_response_mad(hdr)) {
 444                         if (!ib_response_mad(sent_hdr))
 445                                 return 1;
 446                         continue;
 447                 } else if (!ib_response_mad(sent_hdr))
 448                         continue;
 449
 450                 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
 451                         return 1;
 452         }
 453
 454         return 0;
 455 }
 456
 457 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
 458                              size_t count, loff_t *pos)
 459 {
 460         struct ib_umad_file *file = filp->private_data;
 461         struct ib_umad_packet *packet;
 462         struct ib_mad_agent *agent;
 463         struct rdma_ah_attr ah_attr;
 464         struct ib_ah *ah;
 465         struct ib_rmpp_mad *rmpp_mad;
 466         __be64 *tid;
 467         int ret, data_len, hdr_len, copy_offset, rmpp_active;
 468         u8 base_version;
 469
 470         if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
 471                 return -EINVAL;
 472
 473         packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
 474         if (!packet)
 475                 return -ENOMEM;
 476
 477         if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
 478                 ret = -EFAULT;
 479                 goto err;
 480         }
 481
 482         if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
 483                 ret = -EINVAL;
 484                 goto err;
 485         }
 486
 487         buf += hdr_size(file);
 488
 489         if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
 490                 ret = -EFAULT;
 491                 goto err;
 492         }
 493
 494         mutex_lock(&file->mutex);
 495
 496         agent = __get_agent(file, packet->mad.hdr.id);
 497         if (!agent) {
 498                 ret = -EINVAL;
 499                 goto err_up;
 500         }
 501
 502         memset(&ah_attr, 0, sizeof ah_attr);
 503         ah_attr.type = rdma_ah_find_type(file->port->ib_dev,
 504                                          file->port->port_num);
 505         rdma_ah_set_dlid(&ah_attr, be16_to_cpu(packet->mad.hdr.lid));
 506         rdma_ah_set_sl(&ah_attr, packet->mad.hdr.sl);
 507         rdma_ah_set_path_bits(&ah_attr, packet->mad.hdr.path_bits);
 508         rdma_ah_set_port_num(&ah_attr, file->port->port_num);
 509         if (packet->mad.hdr.grh_present) {
 510                 rdma_ah_set_grh(&ah_attr, NULL,
 511                                 be32_to_cpu(packet->mad.hdr.flow_label),
 512                                 packet->mad.hdr.gid_index,
 513                                 packet->mad.hdr.hop_limit,
 514                                 packet->mad.hdr.traffic_class);
 515                 rdma_ah_set_dgid_raw(&ah_attr, packet->mad.hdr.gid);
 516         }
 517
 518         ah = rdma_create_user_ah(agent->qp->pd, &ah_attr, NULL);
 519         if (IS_ERR(ah)) {
 520                 ret = PTR_ERR(ah);
 521                 goto err_up;
 522         }
 523
 524         rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
 525         hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
 526
 527         if (ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
 528             && ib_mad_kernel_rmpp_agent(agent)) {
 529                 copy_offset = IB_MGMT_RMPP_HDR;
 530                 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 531                                                 IB_MGMT_RMPP_FLAG_ACTIVE;
 532         } else {
 533                 copy_offset = IB_MGMT_MAD_HDR;
 534                 rmpp_active = 0;
 535         }
 536
 537         base_version = ((struct ib_mad_hdr *)&packet->mad.data)->base_version;
 538         data_len = count - hdr_size(file) - hdr_len;
 539         packet->msg = ib_create_send_mad(agent,
 540                                          be32_to_cpu(packet->mad.hdr.qpn),
 541                                          packet->mad.hdr.pkey_index, rmpp_active,
 542                                          hdr_len, data_len, GFP_KERNEL,
 543                                          base_version);
 544         if (IS_ERR(packet->msg)) {
 545                 ret = PTR_ERR(packet->msg);
 546                 goto err_ah;
 547         }
 548
 549         packet->msg->ah         = ah;
 550         packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
 551         packet->msg->retries    = packet->mad.hdr.retries;
 552         packet->msg->context[0] = packet;
 553
 554         /* Copy MAD header.  Any RMPP header is already in place. */
 555         memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
 556
 557         if (!rmpp_active) {
 558                 if (copy_from_user(packet->msg->mad + copy_offset,
 559                                    buf + copy_offset,
 560                                    hdr_len + data_len - copy_offset)) {
 561                         ret = -EFAULT;
 562                         goto err_msg;
 563                 }
 564         } else {
 565                 ret = copy_rmpp_mad(packet->msg, buf);
 566                 if (ret)
 567                         goto err_msg;
 568         }
 569
 570         /*
 571          * Set the high-order part of the transaction ID to make MADs from
 572          * different agents unique, and allow routing responses back to the
 573          * original requestor.
 574          */
 575         if (!ib_response_mad(packet->msg->mad)) {
 576                 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
 577                 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
 578                                    (be64_to_cpup(tid) & 0xffffffff));
 579                 rmpp_mad->mad_hdr.tid = *tid;
 580         }
 581
 582         if (!ib_mad_kernel_rmpp_agent(agent)
 583            && ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
 584            && (ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE)) {
 585                 spin_lock_irq(&file->send_lock);
 586                 list_add_tail(&packet->list, &file->send_list);
 587                 spin_unlock_irq(&file->send_lock);
 588         } else {
 589                 spin_lock_irq(&file->send_lock);
 590                 ret = is_duplicate(file, packet);
 591                 if (!ret)
 592                         list_add_tail(&packet->list, &file->send_list);
 593                 spin_unlock_irq(&file->send_lock);
 594                 if (ret) {
 595                         ret = -EINVAL;
 596                         goto err_msg;
 597                 }
 598         }
 599
 600         ret = ib_post_send_mad(packet->msg, NULL);
 601         if (ret)
 602                 goto err_send;
 603
 604         mutex_unlock(&file->mutex);
 605         return count;
 606
 607 err_send:
 608         dequeue_send(file, packet);
 609 err_msg:
 610         ib_free_send_mad(packet->msg);
 611 err_ah:
 612         rdma_destroy_ah(ah);
 613 err_up:
 614         mutex_unlock(&file->mutex);
 615 err:
 616         kfree(packet);
 617         return ret;
 618 }
 619
 620 static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
 621 {
 622         struct ib_umad_file *file = filp->private_data;
 623
 624         /* we will always be able to post a MAD send */
 625         unsigned int mask = POLLOUT | POLLWRNORM;
 626
 627         poll_wait(filp, &file->recv_wait, wait);
 628
 629         if (!list_empty(&file->recv_list))
 630                 mask |= POLLIN | POLLRDNORM;
 631
 632         return mask;
 633 }
 634
 635 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
 636                              int compat_method_mask)
 637 {
 638         struct ib_user_mad_reg_req ureq;
 639         struct ib_mad_reg_req req;
 640         struct ib_mad_agent *agent = NULL;
 641         int agent_id;
 642         int ret;
 643
 644         mutex_lock(&file->port->file_mutex);
 645         mutex_lock(&file->mutex);
 646
 647         if (!file->port->ib_dev) {
 648                 dev_notice(file->port->dev,
 649                            "ib_umad_reg_agent: invalid device\n");
 650                 ret = -EPIPE;
 651                 goto out;
 652         }
 653
 654         if (copy_from_user(&ureq, arg, sizeof ureq)) {
 655                 ret = -EFAULT;
 656                 goto out;
 657         }
 658
 659         if (ureq.qpn != 0 && ureq.qpn != 1) {
 660                 dev_notice(file->port->dev,
 661                            "ib_umad_reg_agent: invalid QPN %d specified\n",
 662                            ureq.qpn);
 663                 ret = -EINVAL;
 664                 goto out;
 665         }
 666
 667         for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
 668                 if (!__get_agent(file, agent_id))
 669                         goto found;
 670
 671         dev_notice(file->port->dev,
 672                    "ib_umad_reg_agent: Max Agents (%u) reached\n",
 673                    IB_UMAD_MAX_AGENTS);
 674         ret = -ENOMEM;
 675         goto out;
 676
 677 found:
 678         if (ureq.mgmt_class) {
 679                 memset(&req, 0, sizeof(req));
 680                 req.mgmt_class         = ureq.mgmt_class;
 681                 req.mgmt_class_version = ureq.mgmt_class_version;
 682                 memcpy(req.oui, ureq.oui, sizeof req.oui);
 683
 684                 if (compat_method_mask) {
 685                         u32 *umm = (u32 *) ureq.method_mask;
 686                         int i;
 687
 688                         for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
 689                                 req.method_mask[i] =
 690                                         umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
 691                 } else
 692                         memcpy(req.method_mask, ureq.method_mask,
 693                                sizeof req.method_mask);
 694         }
 695
 696         agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
 697                                       ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
 698                                       ureq.mgmt_class ? &req : NULL,
 699                                       ureq.rmpp_version,
 700                                       send_handler, recv_handler, file, 0);
 701         if (IS_ERR(agent)) {
 702                 ret = PTR_ERR(agent);
 703                 agent = NULL;
 704                 goto out;
 705         }
 706
 707         if (put_user(agent_id,
 708                      (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
 709                 ret = -EFAULT;
 710                 goto out;
 711         }
 712
 713         if (!file->already_used) {
 714                 file->already_used = 1;
 715                 if (!file->use_pkey_index) {
 716                         dev_warn(file->port->dev,
 717                                 "process %s did not enable P_Key index support.\n",
 718                                 current->comm);
 719                         dev_warn(file->port->dev,
 720                                 "   Documentation/infiniband/user_mad.txt has info on the new ABI.\n");
 721                 }
 722         }
 723
 724         file->agent[agent_id] = agent;
 725         ret = 0;
 726
 727 out:
 728         mutex_unlock(&file->mutex);
 729
 730         if (ret && agent)
 731                 ib_unregister_mad_agent(agent);
 732
 733         mutex_unlock(&file->port->file_mutex);
 734
 735         return ret;
 736 }
 737
 738 static int ib_umad_reg_agent2(struct ib_umad_file *file, void __user *arg)
 739 {
 740         struct ib_user_mad_reg_req2 ureq;
 741         struct ib_mad_reg_req req;
 742         struct ib_mad_agent *agent = NULL;
 743         int agent_id;
 744         int ret;
 745
 746         mutex_lock(&file->port->file_mutex);
 747         mutex_lock(&file->mutex);
 748
 749         if (!file->port->ib_dev) {
 750                 dev_notice(file->port->dev,
 751                            "ib_umad_reg_agent2: invalid device\n");
 752                 ret = -EPIPE;
 753                 goto out;
 754         }
 755
 756         if (copy_from_user(&ureq, arg, sizeof(ureq))) {
 757                 ret = -EFAULT;
 758                 goto out;
 759         }
 760
 761         if (ureq.qpn != 0 && ureq.qpn != 1) {
 762                 dev_notice(file->port->dev,
 763                            "ib_umad_reg_agent2: invalid QPN %d specified\n",
 764                            ureq.qpn);
 765                 ret = -EINVAL;
 766                 goto out;
 767         }
 768
 769         if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) {
 770                 dev_notice(file->port->dev,
 771                            "ib_umad_reg_agent2 failed: invalid registration flags specified 0x%x; supported 0x%x\n",
 772                            ureq.flags, IB_USER_MAD_REG_FLAGS_CAP);
 773                 ret = -EINVAL;
 774
 775                 if (put_user((u32)IB_USER_MAD_REG_FLAGS_CAP,
 776                                 (u32 __user *) (arg + offsetof(struct
 777                                 ib_user_mad_reg_req2, flags))))
 778                         ret = -EFAULT;
 779
 780                 goto out;
 781         }
 782
 783         for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
 784                 if (!__get_agent(file, agent_id))
 785                         goto found;
 786
 787         dev_notice(file->port->dev,
 788                    "ib_umad_reg_agent2: Max Agents (%u) reached\n",
 789                    IB_UMAD_MAX_AGENTS);
 790         ret = -ENOMEM;
 791         goto out;
 792
 793 found:
 794         if (ureq.mgmt_class) {
 795                 memset(&req, 0, sizeof(req));
 796                 req.mgmt_class         = ureq.mgmt_class;
 797                 req.mgmt_class_version = ureq.mgmt_class_version;
 798                 if (ureq.oui & 0xff000000) {
 799                         dev_notice(file->port->dev,
 800                                    "ib_umad_reg_agent2 failed: oui invalid 0x%08x\n",
 801                                    ureq.oui);
 802                         ret = -EINVAL;
 803                         goto out;
 804                 }
 805                 req.oui[2] =  ureq.oui & 0x0000ff;
 806                 req.oui[1] = (ureq.oui & 0x00ff00) >> 8;
 807                 req.oui[0] = (ureq.oui & 0xff0000) >> 16;
 808                 memcpy(req.method_mask, ureq.method_mask,
 809                         sizeof(req.method_mask));
 810         }
 811
 812         agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
 813                                       ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
 814                                       ureq.mgmt_class ? &req : NULL,
 815                                       ureq.rmpp_version,
 816                                       send_handler, recv_handler, file,
 817                                       ureq.flags);
 818         if (IS_ERR(agent)) {
 819                 ret = PTR_ERR(agent);
 820                 agent = NULL;
 821                 goto out;
 822         }
 823
 824         if (put_user(agent_id,
 825                      (u32 __user *)(arg +
 826                                 offsetof(struct ib_user_mad_reg_req2, id)))) {
 827                 ret = -EFAULT;
 828                 goto out;
 829         }
 830
 831         if (!file->already_used) {
 832                 file->already_used = 1;
 833                 file->use_pkey_index = 1;
 834         }
 835
 836         file->agent[agent_id] = agent;
 837         ret = 0;
 838
 839 out:
 840         mutex_unlock(&file->mutex);
 841
 842         if (ret && agent)
 843                 ib_unregister_mad_agent(agent);
 844
 845         mutex_unlock(&file->port->file_mutex);
 846
 847         return ret;
 848 }
 849
 850
 851 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
 852 {
 853         struct ib_mad_agent *agent = NULL;
 854         u32 id;
 855         int ret = 0;
 856
 857         if (get_user(id, arg))
 858                 return -EFAULT;
 859
 860         mutex_lock(&file->port->file_mutex);
 861         mutex_lock(&file->mutex);
 862
 863         if (id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
 864                 ret = -EINVAL;
 865                 goto out;
 866         }
 867
 868         agent = file->agent[id];
 869         file->agent[id] = NULL;
 870
 871 out:
 872         mutex_unlock(&file->mutex);
 873
 874         if (agent)
 875                 ib_unregister_mad_agent(agent);
 876
 877         mutex_unlock(&file->port->file_mutex);
 878
 879         return ret;
 880 }
 881
 882 static long ib_umad_enable_pkey(struct ib_umad_file *file)
 883 {
 884         int ret = 0;
 885
 886         mutex_lock(&file->mutex);
 887         if (file->already_used)
 888                 ret = -EINVAL;
 889         else
 890                 file->use_pkey_index = 1;
 891         mutex_unlock(&file->mutex);
 892
 893         return ret;
 894 }
 895
 896 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
 897                           unsigned long arg)
 898 {
 899         switch (cmd) {
 900         case IB_USER_MAD_REGISTER_AGENT:
 901                 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
 902         case IB_USER_MAD_UNREGISTER_AGENT:
 903                 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
 904         case IB_USER_MAD_ENABLE_PKEY:
 905                 return ib_umad_enable_pkey(filp->private_data);
 906         case IB_USER_MAD_REGISTER_AGENT2:
 907                 return ib_umad_reg_agent2(filp->private_data, (void __user *) arg);
 908         default:
 909                 return -ENOIOCTLCMD;
 910         }
 911 }
 912
 913 #ifdef CONFIG_COMPAT
 914 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
 915                                  unsigned long arg)
 916 {
 917         switch (cmd) {
 918         case IB_USER_MAD_REGISTER_AGENT:
 919                 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
 920         case IB_USER_MAD_UNREGISTER_AGENT:
 921                 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
 922         case IB_USER_MAD_ENABLE_PKEY:
 923                 return ib_umad_enable_pkey(filp->private_data);
 924         case IB_USER_MAD_REGISTER_AGENT2:
 925                 return ib_umad_reg_agent2(filp->private_data, compat_ptr(arg));
 926         default:
 927                 return -ENOIOCTLCMD;
 928         }
 929 }
 930 #endif
 931
 932 /*
 933  * ib_umad_open() does not need the BKL:
 934  *
 935  *  - the ib_umad_port structures are properly reference counted, and
 936  *    everything else is purely local to the file being created, so
 937  *    races against other open calls are not a problem;
 938  *  - the ioctl method does not affect any global state outside of the
 939  *    file structure being operated on;
 940  */
 941 static int ib_umad_open(struct inode *inode, struct file *filp)
 942 {
 943         struct ib_umad_port *port;
 944         struct ib_umad_file *file;
 945         int ret = -ENXIO;
 946
 947         port = container_of(inode->i_cdev, struct ib_umad_port, cdev);
 948
 949         mutex_lock(&port->file_mutex);
 950
 951         if (!port->ib_dev)
 952                 goto out;
 953
 954         ret = -ENOMEM;
 955         file = kzalloc(sizeof *file, GFP_KERNEL);
 956         if (!file)
 957                 goto out;
 958
 959         mutex_init(&file->mutex);
 960         spin_lock_init(&file->send_lock);
 961         INIT_LIST_HEAD(&file->recv_list);
 962         INIT_LIST_HEAD(&file->send_list);
 963         init_waitqueue_head(&file->recv_wait);
 964
 965         file->port = port;
 966         filp->private_data = file;
 967
 968         list_add_tail(&file->port_list, &port->file_list);
 969
 970         ret = nonseekable_open(inode, filp);
 971         if (ret) {
 972                 list_del(&file->port_list);
 973                 kfree(file);
 974                 goto out;
 975         }
 976
 977         kobject_get(&port->umad_dev->kobj);
 978
 979 out:
 980         mutex_unlock(&port->file_mutex);
 981         return ret;
 982 }
 983
 984 static int ib_umad_close(struct inode *inode, struct file *filp)
 985 {
 986         struct ib_umad_file *file = filp->private_data;
 987         struct ib_umad_device *dev = file->port->umad_dev;
 988         struct ib_umad_packet *packet, *tmp;
 989         int already_dead;
 990         int i;
 991
 992         mutex_lock(&file->port->file_mutex);
 993         mutex_lock(&file->mutex);
 994
 995         already_dead = file->agents_dead;
 996         file->agents_dead = 1;
 997
 998         list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
 999                 if (packet->recv_wc)
1000                         ib_free_recv_mad(packet->recv_wc);
1001                 kfree(packet);
1002         }
1003
1004         list_del(&file->port_list);
1005
1006         mutex_unlock(&file->mutex);
1007
1008         if (!already_dead)
1009                 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
1010                         if (file->agent[i])
1011                                 ib_unregister_mad_agent(file->agent[i]);
1012
1013         mutex_unlock(&file->port->file_mutex);
1014
1015         kfree(file);
1016         kobject_put(&dev->kobj);
1017
1018         return 0;
1019 }
1020
1021 static const struct file_operations umad_fops = {
1022         .owner          = THIS_MODULE,
1023         .read           = ib_umad_read,
1024         .write          = ib_umad_write,
1025         .poll           = ib_umad_poll,
1026         .unlocked_ioctl = ib_umad_ioctl,
1027 #ifdef CONFIG_COMPAT
1028         .compat_ioctl   = ib_umad_compat_ioctl,
1029 #endif
1030         .open           = ib_umad_open,
1031         .release        = ib_umad_close,
1032         .llseek         = no_llseek,
1033 };
1034
1035 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
1036 {
1037         struct ib_umad_port *port;
1038         struct ib_port_modify props = {
1039                 .set_port_cap_mask = IB_PORT_SM
1040         };
1041         int ret;
1042
1043         port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev);
1044
1045         if (filp->f_flags & O_NONBLOCK) {
1046                 if (down_trylock(&port->sm_sem)) {
1047                         ret = -EAGAIN;
1048                         goto fail;
1049                 }
1050         } else {
1051                 if (down_interruptible(&port->sm_sem)) {
1052                         ret = -ERESTARTSYS;
1053                         goto fail;
1054                 }
1055         }
1056
1057         ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1058         if (ret)
1059                 goto err_up_sem;
1060
1061         filp->private_data = port;
1062
1063         ret = nonseekable_open(inode, filp);
1064         if (ret)
1065                 goto err_clr_sm_cap;
1066
1067         kobject_get(&port->umad_dev->kobj);
1068
1069         return 0;
1070
1071 err_clr_sm_cap:
1072         swap(props.set_port_cap_mask, props.clr_port_cap_mask);
1073         ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1074
1075 err_up_sem:
1076         up(&port->sm_sem);
1077
1078 fail:
1079         return ret;
1080 }
1081
1082 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
1083 {
1084         struct ib_umad_port *port = filp->private_data;
1085         struct ib_port_modify props = {
1086                 .clr_port_cap_mask = IB_PORT_SM
1087         };
1088         int ret = 0;
1089
1090         mutex_lock(&port->file_mutex);
1091         if (port->ib_dev)
1092                 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1093         mutex_unlock(&port->file_mutex);
1094
1095         up(&port->sm_sem);
1096
1097         kobject_put(&port->umad_dev->kobj);
1098
1099         return ret;
1100 }
1101
1102 static const struct file_operations umad_sm_fops = {
1103         .owner   = THIS_MODULE,
1104         .open    = ib_umad_sm_open,
1105         .release = ib_umad_sm_close,
1106         .llseek  = no_llseek,
1107 };
1108
1109 static struct ib_client umad_client = {
1110         .name   = "umad",
1111         .add    = ib_umad_add_one,
1112         .remove = ib_umad_remove_one
1113 };
1114
1115 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
1116                           char *buf)
1117 {
1118         struct ib_umad_port *port = dev_get_drvdata(dev);
1119
1120         if (!port)
1121                 return -ENODEV;
1122
1123         return sprintf(buf, "%s\n", port->ib_dev->name);
1124 }
1125 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1126
1127 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
1128                          char *buf)
1129 {
1130         struct ib_umad_port *port = dev_get_drvdata(dev);
1131
1132         if (!port)
1133                 return -ENODEV;
1134
1135         return sprintf(buf, "%d\n", port->port_num);
1136 }
1137 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1138
1139 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1140                          __stringify(IB_USER_MAD_ABI_VERSION));
1141
1142 static dev_t overflow_maj;
1143 static DECLARE_BITMAP(overflow_map, IB_UMAD_MAX_PORTS);
1144 static int find_overflow_devnum(struct ib_device *device)
1145 {
1146         int ret;
1147
1148         if (!overflow_maj) {
1149                 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UMAD_MAX_PORTS * 2,
1150                                           "infiniband_mad");
1151                 if (ret) {
1152                         dev_err(&device->dev,
1153                                 "couldn't register dynamic device number\n");
1154                         return ret;
1155                 }
1156         }
1157
1158         ret = find_first_zero_bit(overflow_map, IB_UMAD_MAX_PORTS);
1159         if (ret >= IB_UMAD_MAX_PORTS)
1160                 return -1;
1161
1162         return ret;
1163 }
1164
1165 static int ib_umad_init_port(struct ib_device *device, int port_num,
1166                              struct ib_umad_device *umad_dev,
1167                              struct ib_umad_port *port)
1168 {
1169         int devnum;
1170         dev_t base;
1171
1172         spin_lock(&port_lock);
1173         devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
1174         if (devnum >= IB_UMAD_MAX_PORTS) {
1175                 spin_unlock(&port_lock);
1176                 devnum = find_overflow_devnum(device);
1177                 if (devnum < 0)
1178                         return -1;
1179
1180                 spin_lock(&port_lock);
1181                 port->dev_num = devnum + IB_UMAD_MAX_PORTS;
1182                 base = devnum + overflow_maj;
1183                 set_bit(devnum, overflow_map);
1184         } else {
1185                 port->dev_num = devnum;
1186                 base = devnum + base_dev;
1187                 set_bit(devnum, dev_map);
1188         }
1189         spin_unlock(&port_lock);
1190
1191         port->ib_dev   = device;
1192         port->port_num = port_num;
1193         sema_init(&port->sm_sem, 1);
1194         mutex_init(&port->file_mutex);
1195         INIT_LIST_HEAD(&port->file_list);
1196
1197         cdev_init(&port->cdev, &umad_fops);
1198         port->cdev.owner = THIS_MODULE;
1199         cdev_set_parent(&port->cdev, &umad_dev->kobj);
1200         kobject_set_name(&port->cdev.kobj, "umad%d", port->dev_num);
1201         if (cdev_add(&port->cdev, base, 1))
1202                 goto err_cdev;
1203
1204         port->dev = device_create(umad_class, device->dev.parent,
1205                                   port->cdev.dev, port,
1206                                   "umad%d", port->dev_num);
1207         if (IS_ERR(port->dev))
1208                 goto err_cdev;
1209
1210         if (device_create_file(port->dev, &dev_attr_ibdev))
1211                 goto err_dev;
1212         if (device_create_file(port->dev, &dev_attr_port))
1213                 goto err_dev;
1214
1215         base += IB_UMAD_MAX_PORTS;
1216         cdev_init(&port->sm_cdev, &umad_sm_fops);
1217         port->sm_cdev.owner = THIS_MODULE;
1218         cdev_set_parent(&port->sm_cdev, &umad_dev->kobj);
1219         kobject_set_name(&port->sm_cdev.kobj, "issm%d", port->dev_num);
1220         if (cdev_add(&port->sm_cdev, base, 1))
1221                 goto err_sm_cdev;
1222
1223         port->sm_dev = device_create(umad_class, device->dev.parent,
1224                                      port->sm_cdev.dev, port,
1225                                      "issm%d", port->dev_num);
1226         if (IS_ERR(port->sm_dev))
1227                 goto err_sm_cdev;
1228
1229         if (device_create_file(port->sm_dev, &dev_attr_ibdev))
1230                 goto err_sm_dev;
1231         if (device_create_file(port->sm_dev, &dev_attr_port))
1232                 goto err_sm_dev;
1233
1234         return 0;
1235
1236 err_sm_dev:
1237         device_destroy(umad_class, port->sm_cdev.dev);
1238
1239 err_sm_cdev:
1240         cdev_del(&port->sm_cdev);
1241
1242 err_dev:
1243         device_destroy(umad_class, port->cdev.dev);
1244
1245 err_cdev:
1246         cdev_del(&port->cdev);
1247         if (port->dev_num < IB_UMAD_MAX_PORTS)
1248                 clear_bit(devnum, dev_map);
1249         else
1250                 clear_bit(devnum, overflow_map);
1251
1252         return -1;
1253 }
1254
1255 static void ib_umad_kill_port(struct ib_umad_port *port)
1256 {
1257         struct ib_umad_file *file;
1258         int id;
1259
1260         dev_set_drvdata(port->dev,    NULL);
1261         dev_set_drvdata(port->sm_dev, NULL);
1262
1263         device_destroy(umad_class, port->cdev.dev);
1264         device_destroy(umad_class, port->sm_cdev.dev);
1265
1266         cdev_del(&port->cdev);
1267         cdev_del(&port->sm_cdev);
1268
1269         mutex_lock(&port->file_mutex);
1270
1271         port->ib_dev = NULL;
1272
1273         list_for_each_entry(file, &port->file_list, port_list) {
1274                 mutex_lock(&file->mutex);
1275                 file->agents_dead = 1;
1276                 mutex_unlock(&file->mutex);
1277
1278                 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1279                         if (file->agent[id])
1280                                 ib_unregister_mad_agent(file->agent[id]);
1281         }
1282
1283         mutex_unlock(&port->file_mutex);
1284
1285         if (port->dev_num < IB_UMAD_MAX_PORTS)
1286                 clear_bit(port->dev_num, dev_map);
1287         else
1288                 clear_bit(port->dev_num - IB_UMAD_MAX_PORTS, overflow_map);
1289 }
1290
1291 static void ib_umad_add_one(struct ib_device *device)
1292 {
1293         struct ib_umad_device *umad_dev;
1294         int s, e, i;
1295         int count = 0;
1296
1297         s = rdma_start_port(device);
1298         e = rdma_end_port(device);
1299
1300         umad_dev = kzalloc(sizeof *umad_dev +
1301                            (e - s + 1) * sizeof (struct ib_umad_port),
1302                            GFP_KERNEL);
1303         if (!umad_dev)
1304                 return;
1305
1306         kobject_init(&umad_dev->kobj, &ib_umad_dev_ktype);
1307
1308         for (i = s; i <= e; ++i) {
1309                 if (!rdma_cap_ib_mad(device, i))
1310                         continue;
1311
1312                 umad_dev->port[i - s].umad_dev = umad_dev;
1313
1314                 if (ib_umad_init_port(device, i, umad_dev,
1315                                       &umad_dev->port[i - s]))
1316                         goto err;
1317
1318                 count++;
1319         }
1320
1321         if (!count)
1322                 goto free;
1323
1324         ib_set_client_data(device, &umad_client, umad_dev);
1325
1326         return;
1327
1328 err:
1329         while (--i >= s) {
1330                 if (!rdma_cap_ib_mad(device, i))
1331                         continue;
1332
1333                 ib_umad_kill_port(&umad_dev->port[i - s]);
1334         }
1335 free:
1336         kobject_put(&umad_dev->kobj);
1337 }
1338
1339 static void ib_umad_remove_one(struct ib_device *device, void *client_data)
1340 {
1341         struct ib_umad_device *umad_dev = client_data;
1342         int i;
1343
1344         if (!umad_dev)
1345                 return;
1346
1347         for (i = 0; i <= rdma_end_port(device) - rdma_start_port(device); ++i) {
1348                 if (rdma_cap_ib_mad(device, i + rdma_start_port(device)))
1349                         ib_umad_kill_port(&umad_dev->port[i]);
1350         }
1351
1352         kobject_put(&umad_dev->kobj);
1353 }
1354
1355 static char *umad_devnode(struct device *dev, umode_t *mode)
1356 {
1357         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1358 }
1359
1360 static int __init ib_umad_init(void)
1361 {
1362         int ret;
1363
1364         ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
1365                                      "infiniband_mad");
1366         if (ret) {
1367                 pr_err("couldn't register device number\n");
1368                 goto out;
1369         }
1370
1371         umad_class = class_create(THIS_MODULE, "infiniband_mad");
1372         if (IS_ERR(umad_class)) {
1373                 ret = PTR_ERR(umad_class);
1374                 pr_err("couldn't create class infiniband_mad\n");
1375                 goto out_chrdev;
1376         }
1377
1378         umad_class->devnode = umad_devnode;
1379
1380         ret = class_create_file(umad_class, &class_attr_abi_version.attr);
1381         if (ret) {
1382                 pr_err("couldn't create abi_version attribute\n");
1383                 goto out_class;
1384         }
1385
1386         ret = ib_register_client(&umad_client);
1387         if (ret) {
1388                 pr_err("couldn't register ib_umad client\n");
1389                 goto out_class;
1390         }
1391
1392         return 0;
1393
1394 out_class:
1395         class_destroy(umad_class);
1396
1397 out_chrdev:
1398         unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1399
1400 out:
1401         return ret;
1402 }
1403
1404 static void __exit ib_umad_cleanup(void)
1405 {
1406         ib_unregister_client(&umad_client);
1407         class_destroy(umad_class);
1408         unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1409         if (overflow_maj)
1410                 unregister_chrdev_region(overflow_maj, IB_UMAD_MAX_PORTS * 2);
1411 }
1412
1413 module_init(ib_umad_init);
1414 module_exit(ib_umad_cleanup);