drivers/infiniband/core/user_mad.c

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
   4  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   5  * Copyright (c) 2008 Cisco. All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  */
  35
  36 #define pr_fmt(fmt) "user_mad: " fmt
  37
  38 #include <linux/module.h>
  39 #include <linux/init.h>
  40 #include <linux/device.h>
  41 #include <linux/err.h>
  42 #include <linux/fs.h>
  43 #include <linux/cdev.h>
  44 #include <linux/dma-mapping.h>
  45 #include <linux/poll.h>
  46 #include <linux/mutex.h>
  47 #include <linux/kref.h>
  48 #include <linux/compat.h>
  49 #include <linux/sched.h>
  50 #include <linux/semaphore.h>
  51 #include <linux/slab.h>
  52
  53 #include <linux/uaccess.h>
  54
  55 #include <rdma/ib_mad.h>
  56 #include <rdma/ib_user_mad.h>
  57
  58 #include "core_priv.h"
  59
  60 MODULE_AUTHOR("Roland Dreier");
  61 MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");
  62 MODULE_LICENSE("Dual BSD/GPL");
  63
  64 enum {
  65         IB_UMAD_MAX_PORTS  = RDMA_MAX_PORTS,
  66         IB_UMAD_MAX_AGENTS = 32,
  67
  68         IB_UMAD_MAJOR      = 231,
  69         IB_UMAD_MINOR_BASE = 0,
  70         IB_UMAD_NUM_FIXED_MINOR = 64,
  71         IB_UMAD_NUM_DYNAMIC_MINOR = IB_UMAD_MAX_PORTS - IB_UMAD_NUM_FIXED_MINOR,
  72         IB_ISSM_MINOR_BASE        = IB_UMAD_NUM_FIXED_MINOR,
  73 };
  74
  75 /*
  76  * Our lifetime rules for these structs are the following:
  77  * device special file is opened, we take a reference on the
  78  * ib_umad_port's struct ib_umad_device. We drop these
  79  * references in the corresponding close().
  80  *
  81  * In addition to references coming from open character devices, there
  82  * is one more reference to each ib_umad_device representing the
  83  * module's reference taken when allocating the ib_umad_device in
  84  * ib_umad_add_one().
  85  *
  86  * When destroying an ib_umad_device, we drop the module's reference.
  87  */
  88
  89 struct ib_umad_port {
  90         struct cdev           cdev;
  91         struct device         dev;
  92         struct cdev           sm_cdev;
  93         struct device         sm_dev;
  94         struct semaphore       sm_sem;
  95
  96         struct mutex           file_mutex;
  97         struct list_head       file_list;
  98
  99         struct ib_device      *ib_dev;
 100         struct ib_umad_device *umad_dev;
 101         int                    dev_num;
 102         u8                     port_num;
 103 };
 104
 105 struct ib_umad_device {
 106         struct kref kref;
 107         struct ib_umad_port ports[];
 108 };
 109
 110 struct ib_umad_file {
 111         struct mutex            mutex;
 112         struct ib_umad_port    *port;
 113         struct list_head        recv_list;
 114         struct list_head        send_list;
 115         struct list_head        port_list;
 116         spinlock_t              send_lock;
 117         wait_queue_head_t       recv_wait;
 118         struct ib_mad_agent    *agent[IB_UMAD_MAX_AGENTS];
 119         int                     agents_dead;
 120         u8                      use_pkey_index;
 121         u8                      already_used;
 122 };
 123
 124 struct ib_umad_packet {
 125         struct ib_mad_send_buf *msg;
 126         struct ib_mad_recv_wc  *recv_wc;
 127         struct list_head   list;
 128         int                length;
 129         struct ib_user_mad mad;
 130 };
 131
 132 #define CREATE_TRACE_POINTS
 133 #include <trace/events/ib_umad.h>
 134
 135 static const dev_t base_umad_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
 136 static const dev_t base_issm_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE) +
 137                                    IB_UMAD_NUM_FIXED_MINOR;
 138 static dev_t dynamic_umad_dev;
 139 static dev_t dynamic_issm_dev;
 140
 141 static DEFINE_IDA(umad_ida);
 142
 143 static void ib_umad_add_one(struct ib_device *device);
 144 static void ib_umad_remove_one(struct ib_device *device, void *client_data);
 145
 146 static void ib_umad_dev_free(struct kref *kref)
 147 {
 148         struct ib_umad_device *dev =
 149                 container_of(kref, struct ib_umad_device, kref);
 150
 151         kfree(dev);
 152 }
 153
 154 static void ib_umad_dev_get(struct ib_umad_device *dev)
 155 {
 156         kref_get(&dev->kref);
 157 }
 158
 159 static void ib_umad_dev_put(struct ib_umad_device *dev)
 160 {
 161         kref_put(&dev->kref, ib_umad_dev_free);
 162 }
 163
 164 static int hdr_size(struct ib_umad_file *file)
 165 {
 166         return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) :
 167                 sizeof (struct ib_user_mad_hdr_old);
 168 }
 169
 170 /* caller must hold file->mutex */
 171 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
 172 {
 173         return file->agents_dead ? NULL : file->agent[id];
 174 }
 175
 176 static int queue_packet(struct ib_umad_file *file,
 177                         struct ib_mad_agent *agent,
 178                         struct ib_umad_packet *packet)
 179 {
 180         int ret = 1;
 181
 182         mutex_lock(&file->mutex);
 183
 184         for (packet->mad.hdr.id = 0;
 185              packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
 186              packet->mad.hdr.id++)
 187                 if (agent == __get_agent(file, packet->mad.hdr.id)) {
 188                         list_add_tail(&packet->list, &file->recv_list);
 189                         wake_up_interruptible(&file->recv_wait);
 190                         ret = 0;
 191                         break;
 192                 }
 193
 194         mutex_unlock(&file->mutex);
 195
 196         return ret;
 197 }
 198
 199 static void dequeue_send(struct ib_umad_file *file,
 200                          struct ib_umad_packet *packet)
 201 {
 202         spin_lock_irq(&file->send_lock);
 203         list_del(&packet->list);
 204         spin_unlock_irq(&file->send_lock);
 205 }
 206
 207 static void send_handler(struct ib_mad_agent *agent,
 208                          struct ib_mad_send_wc *send_wc)
 209 {
 210         struct ib_umad_file *file = agent->context;
 211         struct ib_umad_packet *packet = send_wc->send_buf->context[0];
 212
 213         dequeue_send(file, packet);
 214         rdma_destroy_ah(packet->msg->ah, RDMA_DESTROY_AH_SLEEPABLE);
 215         ib_free_send_mad(packet->msg);
 216
 217         if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
 218                 packet->length = IB_MGMT_MAD_HDR;
 219                 packet->mad.hdr.status = ETIMEDOUT;
 220                 if (!queue_packet(file, agent, packet))
 221                         return;
 222         }
 223         kfree(packet);
 224 }
 225
 226 static void recv_handler(struct ib_mad_agent *agent,
 227                          struct ib_mad_send_buf *send_buf,
 228                          struct ib_mad_recv_wc *mad_recv_wc)
 229 {
 230         struct ib_umad_file *file = agent->context;
 231         struct ib_umad_packet *packet;
 232
 233         if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
 234                 goto err1;
 235
 236         packet = kzalloc(sizeof *packet, GFP_KERNEL);
 237         if (!packet)
 238                 goto err1;
 239
 240         packet->length = mad_recv_wc->mad_len;
 241         packet->recv_wc = mad_recv_wc;
 242
 243         packet->mad.hdr.status     = 0;
 244         packet->mad.hdr.length     = hdr_size(file) + mad_recv_wc->mad_len;
 245         packet->mad.hdr.qpn        = cpu_to_be32(mad_recv_wc->wc->src_qp);
 246         /*
 247          * On OPA devices it is okay to lose the upper 16 bits of LID as this
 248          * information is obtained elsewhere. Mask off the upper 16 bits.
 249          */
 250         if (rdma_cap_opa_mad(agent->device, agent->port_num))
 251                 packet->mad.hdr.lid = ib_lid_be16(0xFFFF &
 252                                                   mad_recv_wc->wc->slid);
 253         else
 254                 packet->mad.hdr.lid = ib_lid_be16(mad_recv_wc->wc->slid);
 255         packet->mad.hdr.sl         = mad_recv_wc->wc->sl;
 256         packet->mad.hdr.path_bits  = mad_recv_wc->wc->dlid_path_bits;
 257         packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;
 258         packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
 259         if (packet->mad.hdr.grh_present) {
 260                 struct rdma_ah_attr ah_attr;
 261                 const struct ib_global_route *grh;
 262                 int ret;
 263
 264                 ret = ib_init_ah_attr_from_wc(agent->device, agent->port_num,
 265                                               mad_recv_wc->wc,
 266                                               mad_recv_wc->recv_buf.grh,
 267                                               &ah_attr);
 268                 if (ret)
 269                         goto err2;
 270
 271                 grh = rdma_ah_read_grh(&ah_attr);
 272                 packet->mad.hdr.gid_index = grh->sgid_index;
 273                 packet->mad.hdr.hop_limit = grh->hop_limit;
 274                 packet->mad.hdr.traffic_class = grh->traffic_class;
 275                 memcpy(packet->mad.hdr.gid, &grh->dgid, 16);
 276                 packet->mad.hdr.flow_label = cpu_to_be32(grh->flow_label);
 277                 rdma_destroy_ah_attr(&ah_attr);
 278         }
 279
 280         if (queue_packet(file, agent, packet))
 281                 goto err2;
 282         return;
 283
 284 err2:
 285         kfree(packet);
 286 err1:
 287         ib_free_recv_mad(mad_recv_wc);
 288 }
 289
 290 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
 291                              struct ib_umad_packet *packet, size_t count)
 292 {
 293         struct ib_mad_recv_buf *recv_buf;
 294         int left, seg_payload, offset, max_seg_payload;
 295         size_t seg_size;
 296
 297         recv_buf = &packet->recv_wc->recv_buf;
 298         seg_size = packet->recv_wc->mad_seg_size;
 299
 300         /* We need enough room to copy the first (or only) MAD segment. */
 301         if ((packet->length <= seg_size &&
 302              count < hdr_size(file) + packet->length) ||
 303             (packet->length > seg_size &&
 304              count < hdr_size(file) + seg_size))
 305                 return -EINVAL;
 306
 307         if (copy_to_user(buf, &packet->mad, hdr_size(file)))
 308                 return -EFAULT;
 309
 310         buf += hdr_size(file);
 311         seg_payload = min_t(int, packet->length, seg_size);
 312         if (copy_to_user(buf, recv_buf->mad, seg_payload))
 313                 return -EFAULT;
 314
 315         if (seg_payload < packet->length) {
 316                 /*
 317                  * Multipacket RMPP MAD message. Copy remainder of message.
 318                  * Note that last segment may have a shorter payload.
 319                  */
 320                 if (count < hdr_size(file) + packet->length) {
 321                         /*
 322                          * The buffer is too small, return the first RMPP segment,
 323                          * which includes the RMPP message length.
 324                          */
 325                         return -ENOSPC;
 326                 }
 327                 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
 328                 max_seg_payload = seg_size - offset;
 329
 330                 for (left = packet->length - seg_payload, buf += seg_payload;
 331                      left; left -= seg_payload, buf += seg_payload) {
 332                         recv_buf = container_of(recv_buf->list.next,
 333                                                 struct ib_mad_recv_buf, list);
 334                         seg_payload = min(left, max_seg_payload);
 335                         if (copy_to_user(buf, ((void *) recv_buf->mad) + offset,
 336                                          seg_payload))
 337                                 return -EFAULT;
 338                 }
 339         }
 340
 341         trace_ib_umad_read_recv(file, &packet->mad.hdr, &recv_buf->mad->mad_hdr);
 342
 343         return hdr_size(file) + packet->length;
 344 }
 345
 346 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
 347                              struct ib_umad_packet *packet, size_t count)
 348 {
 349         ssize_t size = hdr_size(file) + packet->length;
 350
 351         if (count < size)
 352                 return -EINVAL;
 353
 354         if (copy_to_user(buf, &packet->mad, hdr_size(file)))
 355                 return -EFAULT;
 356
 357         buf += hdr_size(file);
 358
 359         if (copy_to_user(buf, packet->mad.data, packet->length))
 360                 return -EFAULT;
 361
 362         trace_ib_umad_read_send(file, &packet->mad.hdr,
 363                                 (struct ib_mad_hdr *)&packet->mad.data);
 364
 365         return size;
 366 }
 367
 368 static ssize_t ib_umad_read(struct file *filp, char __user *buf,
 369                             size_t count, loff_t *pos)
 370 {
 371         struct ib_umad_file *file = filp->private_data;
 372         struct ib_umad_packet *packet;
 373         ssize_t ret;
 374
 375         if (count < hdr_size(file))
 376                 return -EINVAL;
 377
 378         mutex_lock(&file->mutex);
 379
 380         while (list_empty(&file->recv_list)) {
 381                 mutex_unlock(&file->mutex);
 382
 383                 if (filp->f_flags & O_NONBLOCK)
 384                         return -EAGAIN;
 385
 386                 if (wait_event_interruptible(file->recv_wait,
 387                                              !list_empty(&file->recv_list)))
 388                         return -ERESTARTSYS;
 389
 390                 mutex_lock(&file->mutex);
 391         }
 392
 393         packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
 394         list_del(&packet->list);
 395
 396         mutex_unlock(&file->mutex);
 397
 398         if (packet->recv_wc)
 399                 ret = copy_recv_mad(file, buf, packet, count);
 400         else
 401                 ret = copy_send_mad(file, buf, packet, count);
 402
 403         if (ret < 0) {
 404                 /* Requeue packet */
 405                 mutex_lock(&file->mutex);
 406                 list_add(&packet->list, &file->recv_list);
 407                 mutex_unlock(&file->mutex);
 408         } else {
 409                 if (packet->recv_wc)
 410                         ib_free_recv_mad(packet->recv_wc);
 411                 kfree(packet);
 412         }
 413         return ret;
 414 }
 415
 416 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
 417 {
 418         int left, seg;
 419
 420         /* Copy class specific header */
 421         if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
 422             copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
 423                            msg->hdr_len - IB_MGMT_RMPP_HDR))
 424                 return -EFAULT;
 425
 426         /* All headers are in place.  Copy data segments. */
 427         for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
 428              seg++, left -= msg->seg_size, buf += msg->seg_size) {
 429                 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
 430                                    min(left, msg->seg_size)))
 431                         return -EFAULT;
 432         }
 433         return 0;
 434 }
 435
 436 static int same_destination(struct ib_user_mad_hdr *hdr1,
 437                             struct ib_user_mad_hdr *hdr2)
 438 {
 439         if (!hdr1->grh_present && !hdr2->grh_present)
 440            return (hdr1->lid == hdr2->lid);
 441
 442         if (hdr1->grh_present && hdr2->grh_present)
 443            return !memcmp(hdr1->gid, hdr2->gid, 16);
 444
 445         return 0;
 446 }
 447
 448 static int is_duplicate(struct ib_umad_file *file,
 449                         struct ib_umad_packet *packet)
 450 {
 451         struct ib_umad_packet *sent_packet;
 452         struct ib_mad_hdr *sent_hdr, *hdr;
 453
 454         hdr = (struct ib_mad_hdr *) packet->mad.data;
 455         list_for_each_entry(sent_packet, &file->send_list, list) {
 456                 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
 457
 458                 if ((hdr->tid != sent_hdr->tid) ||
 459                     (hdr->mgmt_class != sent_hdr->mgmt_class))
 460                         continue;
 461
 462                 /*
 463                  * No need to be overly clever here.  If two new operations have
 464                  * the same TID, reject the second as a duplicate.  This is more
 465                  * restrictive than required by the spec.
 466                  */
 467                 if (!ib_response_mad(hdr)) {
 468                         if (!ib_response_mad(sent_hdr))
 469                                 return 1;
 470                         continue;
 471                 } else if (!ib_response_mad(sent_hdr))
 472                         continue;
 473
 474                 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
 475                         return 1;
 476         }
 477
 478         return 0;
 479 }
 480
 481 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
 482                              size_t count, loff_t *pos)
 483 {
 484         struct ib_umad_file *file = filp->private_data;
 485         struct ib_umad_packet *packet;
 486         struct ib_mad_agent *agent;
 487         struct rdma_ah_attr ah_attr;
 488         struct ib_ah *ah;
 489         struct ib_rmpp_mad *rmpp_mad;
 490         __be64 *tid;
 491         int ret, data_len, hdr_len, copy_offset, rmpp_active;
 492         u8 base_version;
 493
 494         if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
 495                 return -EINVAL;
 496
 497         packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
 498         if (!packet)
 499                 return -ENOMEM;
 500
 501         if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
 502                 ret = -EFAULT;
 503                 goto err;
 504         }
 505
 506         if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
 507                 ret = -EINVAL;
 508                 goto err;
 509         }
 510
 511         buf += hdr_size(file);
 512
 513         if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
 514                 ret = -EFAULT;
 515                 goto err;
 516         }
 517
 518         mutex_lock(&file->mutex);
 519
 520         trace_ib_umad_write(file, &packet->mad.hdr,
 521                             (struct ib_mad_hdr *)&packet->mad.data);
 522
 523         agent = __get_agent(file, packet->mad.hdr.id);
 524         if (!agent) {
 525                 ret = -EINVAL;
 526                 goto err_up;
 527         }
 528
 529         memset(&ah_attr, 0, sizeof ah_attr);
 530         ah_attr.type = rdma_ah_find_type(agent->device,
 531                                          file->port->port_num);
 532         rdma_ah_set_dlid(&ah_attr, be16_to_cpu(packet->mad.hdr.lid));
 533         rdma_ah_set_sl(&ah_attr, packet->mad.hdr.sl);
 534         rdma_ah_set_path_bits(&ah_attr, packet->mad.hdr.path_bits);
 535         rdma_ah_set_port_num(&ah_attr, file->port->port_num);
 536         if (packet->mad.hdr.grh_present) {
 537                 rdma_ah_set_grh(&ah_attr, NULL,
 538                                 be32_to_cpu(packet->mad.hdr.flow_label),
 539                                 packet->mad.hdr.gid_index,
 540                                 packet->mad.hdr.hop_limit,
 541                                 packet->mad.hdr.traffic_class);
 542                 rdma_ah_set_dgid_raw(&ah_attr, packet->mad.hdr.gid);
 543         }
 544
 545         ah = rdma_create_user_ah(agent->qp->pd, &ah_attr, NULL);
 546         if (IS_ERR(ah)) {
 547                 ret = PTR_ERR(ah);
 548                 goto err_up;
 549         }
 550
 551         rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
 552         hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
 553
 554         if (ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
 555             && ib_mad_kernel_rmpp_agent(agent)) {
 556                 copy_offset = IB_MGMT_RMPP_HDR;
 557                 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 558                                                 IB_MGMT_RMPP_FLAG_ACTIVE;
 559         } else {
 560                 copy_offset = IB_MGMT_MAD_HDR;
 561                 rmpp_active = 0;
 562         }
 563
 564         base_version = ((struct ib_mad_hdr *)&packet->mad.data)->base_version;
 565         data_len = count - hdr_size(file) - hdr_len;
 566         packet->msg = ib_create_send_mad(agent,
 567                                          be32_to_cpu(packet->mad.hdr.qpn),
 568                                          packet->mad.hdr.pkey_index, rmpp_active,
 569                                          hdr_len, data_len, GFP_KERNEL,
 570                                          base_version);
 571         if (IS_ERR(packet->msg)) {
 572                 ret = PTR_ERR(packet->msg);
 573                 goto err_ah;
 574         }
 575
 576         packet->msg->ah         = ah;
 577         packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
 578         packet->msg->retries    = packet->mad.hdr.retries;
 579         packet->msg->context[0] = packet;
 580
 581         /* Copy MAD header.  Any RMPP header is already in place. */
 582         memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
 583
 584         if (!rmpp_active) {
 585                 if (copy_from_user(packet->msg->mad + copy_offset,
 586                                    buf + copy_offset,
 587                                    hdr_len + data_len - copy_offset)) {
 588                         ret = -EFAULT;
 589                         goto err_msg;
 590                 }
 591         } else {
 592                 ret = copy_rmpp_mad(packet->msg, buf);
 593                 if (ret)
 594                         goto err_msg;
 595         }
 596
 597         /*
 598          * Set the high-order part of the transaction ID to make MADs from
 599          * different agents unique, and allow routing responses back to the
 600          * original requestor.
 601          */
 602         if (!ib_response_mad(packet->msg->mad)) {
 603                 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
 604                 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
 605                                    (be64_to_cpup(tid) & 0xffffffff));
 606                 rmpp_mad->mad_hdr.tid = *tid;
 607         }
 608
 609         if (!ib_mad_kernel_rmpp_agent(agent)
 610            && ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
 611            && (ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE)) {
 612                 spin_lock_irq(&file->send_lock);
 613                 list_add_tail(&packet->list, &file->send_list);
 614                 spin_unlock_irq(&file->send_lock);
 615         } else {
 616                 spin_lock_irq(&file->send_lock);
 617                 ret = is_duplicate(file, packet);
 618                 if (!ret)
 619                         list_add_tail(&packet->list, &file->send_list);
 620                 spin_unlock_irq(&file->send_lock);
 621                 if (ret) {
 622                         ret = -EINVAL;
 623                         goto err_msg;
 624                 }
 625         }
 626
 627         ret = ib_post_send_mad(packet->msg, NULL);
 628         if (ret)
 629                 goto err_send;
 630
 631         mutex_unlock(&file->mutex);
 632         return count;
 633
 634 err_send:
 635         dequeue_send(file, packet);
 636 err_msg:
 637         ib_free_send_mad(packet->msg);
 638 err_ah:
 639         rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);
 640 err_up:
 641         mutex_unlock(&file->mutex);
 642 err:
 643         kfree(packet);
 644         return ret;
 645 }
 646
 647 static __poll_t ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
 648 {
 649         struct ib_umad_file *file = filp->private_data;
 650
 651         /* we will always be able to post a MAD send */
 652         __poll_t mask = EPOLLOUT | EPOLLWRNORM;
 653
 654         poll_wait(filp, &file->recv_wait, wait);
 655
 656         if (!list_empty(&file->recv_list))
 657                 mask |= EPOLLIN | EPOLLRDNORM;
 658
 659         return mask;
 660 }
 661
 662 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
 663                              int compat_method_mask)
 664 {
 665         struct ib_user_mad_reg_req ureq;
 666         struct ib_mad_reg_req req;
 667         struct ib_mad_agent *agent = NULL;
 668         int agent_id;
 669         int ret;
 670
 671         mutex_lock(&file->port->file_mutex);
 672         mutex_lock(&file->mutex);
 673
 674         if (!file->port->ib_dev) {
 675                 dev_notice(&file->port->dev,
 676                            "ib_umad_reg_agent: invalid device\n");
 677                 ret = -EPIPE;
 678                 goto out;
 679         }
 680
 681         if (copy_from_user(&ureq, arg, sizeof ureq)) {
 682                 ret = -EFAULT;
 683                 goto out;
 684         }
 685
 686         if (ureq.qpn != 0 && ureq.qpn != 1) {
 687                 dev_notice(&file->port->dev,
 688                            "ib_umad_reg_agent: invalid QPN %d specified\n",
 689                            ureq.qpn);
 690                 ret = -EINVAL;
 691                 goto out;
 692         }
 693
 694         for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
 695                 if (!__get_agent(file, agent_id))
 696                         goto found;
 697
 698         dev_notice(&file->port->dev,
 699                    "ib_umad_reg_agent: Max Agents (%u) reached\n",
 700                    IB_UMAD_MAX_AGENTS);
 701         ret = -ENOMEM;
 702         goto out;
 703
 704 found:
 705         if (ureq.mgmt_class) {
 706                 memset(&req, 0, sizeof(req));
 707                 req.mgmt_class         = ureq.mgmt_class;
 708                 req.mgmt_class_version = ureq.mgmt_class_version;
 709                 memcpy(req.oui, ureq.oui, sizeof req.oui);
 710
 711                 if (compat_method_mask) {
 712                         u32 *umm = (u32 *) ureq.method_mask;
 713                         int i;
 714
 715                         for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
 716                                 req.method_mask[i] =
 717                                         umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
 718                 } else
 719                         memcpy(req.method_mask, ureq.method_mask,
 720                                sizeof req.method_mask);
 721         }
 722
 723         agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
 724                                       ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
 725                                       ureq.mgmt_class ? &req : NULL,
 726                                       ureq.rmpp_version,
 727                                       send_handler, recv_handler, file, 0);
 728         if (IS_ERR(agent)) {
 729                 ret = PTR_ERR(agent);
 730                 agent = NULL;
 731                 goto out;
 732         }
 733
 734         if (put_user(agent_id,
 735                      (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
 736                 ret = -EFAULT;
 737                 goto out;
 738         }
 739
 740         if (!file->already_used) {
 741                 file->already_used = 1;
 742                 if (!file->use_pkey_index) {
 743                         dev_warn(&file->port->dev,
 744                                 "process %s did not enable P_Key index support.\n",
 745                                 current->comm);
 746                         dev_warn(&file->port->dev,
 747                                 "   Documentation/infiniband/user_mad.txt has info on the new ABI.\n");
 748                 }
 749         }
 750
 751         file->agent[agent_id] = agent;
 752         ret = 0;
 753
 754 out:
 755         mutex_unlock(&file->mutex);
 756
 757         if (ret && agent)
 758                 ib_unregister_mad_agent(agent);
 759
 760         mutex_unlock(&file->port->file_mutex);
 761
 762         return ret;
 763 }
 764
 765 static int ib_umad_reg_agent2(struct ib_umad_file *file, void __user *arg)
 766 {
 767         struct ib_user_mad_reg_req2 ureq;
 768         struct ib_mad_reg_req req;
 769         struct ib_mad_agent *agent = NULL;
 770         int agent_id;
 771         int ret;
 772
 773         mutex_lock(&file->port->file_mutex);
 774         mutex_lock(&file->mutex);
 775
 776         if (!file->port->ib_dev) {
 777                 dev_notice(&file->port->dev,
 778                            "ib_umad_reg_agent2: invalid device\n");
 779                 ret = -EPIPE;
 780                 goto out;
 781         }
 782
 783         if (copy_from_user(&ureq, arg, sizeof(ureq))) {
 784                 ret = -EFAULT;
 785                 goto out;
 786         }
 787
 788         if (ureq.qpn != 0 && ureq.qpn != 1) {
 789                 dev_notice(&file->port->dev,
 790                            "ib_umad_reg_agent2: invalid QPN %d specified\n",
 791                            ureq.qpn);
 792                 ret = -EINVAL;
 793                 goto out;
 794         }
 795
 796         if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) {
 797                 dev_notice(&file->port->dev,
 798                            "ib_umad_reg_agent2 failed: invalid registration flags specified 0x%x; supported 0x%x\n",
 799                            ureq.flags, IB_USER_MAD_REG_FLAGS_CAP);
 800                 ret = -EINVAL;
 801
 802                 if (put_user((u32)IB_USER_MAD_REG_FLAGS_CAP,
 803                                 (u32 __user *) (arg + offsetof(struct
 804                                 ib_user_mad_reg_req2, flags))))
 805                         ret = -EFAULT;
 806
 807                 goto out;
 808         }
 809
 810         for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
 811                 if (!__get_agent(file, agent_id))
 812                         goto found;
 813
 814         dev_notice(&file->port->dev,
 815                    "ib_umad_reg_agent2: Max Agents (%u) reached\n",
 816                    IB_UMAD_MAX_AGENTS);
 817         ret = -ENOMEM;
 818         goto out;
 819
 820 found:
 821         if (ureq.mgmt_class) {
 822                 memset(&req, 0, sizeof(req));
 823                 req.mgmt_class         = ureq.mgmt_class;
 824                 req.mgmt_class_version = ureq.mgmt_class_version;
 825                 if (ureq.oui & 0xff000000) {
 826                         dev_notice(&file->port->dev,
 827                                    "ib_umad_reg_agent2 failed: oui invalid 0x%08x\n",
 828                                    ureq.oui);
 829                         ret = -EINVAL;
 830                         goto out;
 831                 }
 832                 req.oui[2] =  ureq.oui & 0x0000ff;
 833                 req.oui[1] = (ureq.oui & 0x00ff00) >> 8;
 834                 req.oui[0] = (ureq.oui & 0xff0000) >> 16;
 835                 memcpy(req.method_mask, ureq.method_mask,
 836                         sizeof(req.method_mask));
 837         }
 838
 839         agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
 840                                       ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
 841                                       ureq.mgmt_class ? &req : NULL,
 842                                       ureq.rmpp_version,
 843                                       send_handler, recv_handler, file,
 844                                       ureq.flags);
 845         if (IS_ERR(agent)) {
 846                 ret = PTR_ERR(agent);
 847                 agent = NULL;
 848                 goto out;
 849         }
 850
 851         if (put_user(agent_id,
 852                      (u32 __user *)(arg +
 853                                 offsetof(struct ib_user_mad_reg_req2, id)))) {
 854                 ret = -EFAULT;
 855                 goto out;
 856         }
 857
 858         if (!file->already_used) {
 859                 file->already_used = 1;
 860                 file->use_pkey_index = 1;
 861         }
 862
 863         file->agent[agent_id] = agent;
 864         ret = 0;
 865
 866 out:
 867         mutex_unlock(&file->mutex);
 868
 869         if (ret && agent)
 870                 ib_unregister_mad_agent(agent);
 871
 872         mutex_unlock(&file->port->file_mutex);
 873
 874         return ret;
 875 }
 876
 877
 878 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
 879 {
 880         struct ib_mad_agent *agent = NULL;
 881         u32 id;
 882         int ret = 0;
 883
 884         if (get_user(id, arg))
 885                 return -EFAULT;
 886
 887         mutex_lock(&file->port->file_mutex);
 888         mutex_lock(&file->mutex);
 889
 890         if (id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
 891                 ret = -EINVAL;
 892                 goto out;
 893         }
 894
 895         agent = file->agent[id];
 896         file->agent[id] = NULL;
 897
 898 out:
 899         mutex_unlock(&file->mutex);
 900
 901         if (agent)
 902                 ib_unregister_mad_agent(agent);
 903
 904         mutex_unlock(&file->port->file_mutex);
 905
 906         return ret;
 907 }
 908
 909 static long ib_umad_enable_pkey(struct ib_umad_file *file)
 910 {
 911         int ret = 0;
 912
 913         mutex_lock(&file->mutex);
 914         if (file->already_used)
 915                 ret = -EINVAL;
 916         else
 917                 file->use_pkey_index = 1;
 918         mutex_unlock(&file->mutex);
 919
 920         return ret;
 921 }
 922
 923 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
 924                           unsigned long arg)
 925 {
 926         switch (cmd) {
 927         case IB_USER_MAD_REGISTER_AGENT:
 928                 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
 929         case IB_USER_MAD_UNREGISTER_AGENT:
 930                 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
 931         case IB_USER_MAD_ENABLE_PKEY:
 932                 return ib_umad_enable_pkey(filp->private_data);
 933         case IB_USER_MAD_REGISTER_AGENT2:
 934                 return ib_umad_reg_agent2(filp->private_data, (void __user *) arg);
 935         default:
 936                 return -ENOIOCTLCMD;
 937         }
 938 }
 939
 940 #ifdef CONFIG_COMPAT
 941 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
 942                                  unsigned long arg)
 943 {
 944         switch (cmd) {
 945         case IB_USER_MAD_REGISTER_AGENT:
 946                 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
 947         case IB_USER_MAD_UNREGISTER_AGENT:
 948                 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
 949         case IB_USER_MAD_ENABLE_PKEY:
 950                 return ib_umad_enable_pkey(filp->private_data);
 951         case IB_USER_MAD_REGISTER_AGENT2:
 952                 return ib_umad_reg_agent2(filp->private_data, compat_ptr(arg));
 953         default:
 954                 return -ENOIOCTLCMD;
 955         }
 956 }
 957 #endif
 958
 959 /*
 960  * ib_umad_open() does not need the BKL:
 961  *
 962  *  - the ib_umad_port structures are properly reference counted, and
 963  *    everything else is purely local to the file being created, so
 964  *    races against other open calls are not a problem;
 965  *  - the ioctl method does not affect any global state outside of the
 966  *    file structure being operated on;
 967  */
 968 static int ib_umad_open(struct inode *inode, struct file *filp)
 969 {
 970         struct ib_umad_port *port;
 971         struct ib_umad_file *file;
 972         int ret = 0;
 973
 974         port = container_of(inode->i_cdev, struct ib_umad_port, cdev);
 975
 976         mutex_lock(&port->file_mutex);
 977
 978         if (!port->ib_dev) {
 979                 ret = -ENXIO;
 980                 goto out;
 981         }
 982
 983         if (!rdma_dev_access_netns(port->ib_dev, current->nsproxy->net_ns)) {
 984                 ret = -EPERM;
 985                 goto out;
 986         }
 987
 988         file = kzalloc(sizeof(*file), GFP_KERNEL);
 989         if (!file) {
 990                 ret = -ENOMEM;
 991                 goto out;
 992         }
 993
 994         mutex_init(&file->mutex);
 995         spin_lock_init(&file->send_lock);
 996         INIT_LIST_HEAD(&file->recv_list);
 997         INIT_LIST_HEAD(&file->send_list);
 998         init_waitqueue_head(&file->recv_wait);
 999
1000         file->port = port;
1001         filp->private_data = file;
1002
1003         list_add_tail(&file->port_list, &port->file_list);
1004
1005         stream_open(inode, filp);
1006 out:
1007         mutex_unlock(&port->file_mutex);
1008         return ret;
1009 }
1010
1011 static int ib_umad_close(struct inode *inode, struct file *filp)
1012 {
1013         struct ib_umad_file *file = filp->private_data;
1014         struct ib_umad_packet *packet, *tmp;
1015         int already_dead;
1016         int i;
1017
1018         mutex_lock(&file->port->file_mutex);
1019         mutex_lock(&file->mutex);
1020
1021         already_dead = file->agents_dead;
1022         file->agents_dead = 1;
1023
1024         list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
1025                 if (packet->recv_wc)
1026                         ib_free_recv_mad(packet->recv_wc);
1027                 kfree(packet);
1028         }
1029
1030         list_del(&file->port_list);
1031
1032         mutex_unlock(&file->mutex);
1033
1034         if (!already_dead)
1035                 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
1036                         if (file->agent[i])
1037                                 ib_unregister_mad_agent(file->agent[i]);
1038
1039         mutex_unlock(&file->port->file_mutex);
1040
1041         kfree(file);
1042         return 0;
1043 }
1044
1045 static const struct file_operations umad_fops = {
1046         .owner          = THIS_MODULE,
1047         .read           = ib_umad_read,
1048         .write          = ib_umad_write,
1049         .poll           = ib_umad_poll,
1050         .unlocked_ioctl = ib_umad_ioctl,
1051 #ifdef CONFIG_COMPAT
1052         .compat_ioctl   = ib_umad_compat_ioctl,
1053 #endif
1054         .open           = ib_umad_open,
1055         .release        = ib_umad_close,
1056         .llseek         = no_llseek,
1057 };
1058
1059 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
1060 {
1061         struct ib_umad_port *port;
1062         struct ib_port_modify props = {
1063                 .set_port_cap_mask = IB_PORT_SM
1064         };
1065         int ret;
1066
1067         port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev);
1068
1069         if (filp->f_flags & O_NONBLOCK) {
1070                 if (down_trylock(&port->sm_sem)) {
1071                         ret = -EAGAIN;
1072                         goto fail;
1073                 }
1074         } else {
1075                 if (down_interruptible(&port->sm_sem)) {
1076                         ret = -ERESTARTSYS;
1077                         goto fail;
1078                 }
1079         }
1080
1081         if (!rdma_dev_access_netns(port->ib_dev, current->nsproxy->net_ns)) {
1082                 ret = -EPERM;
1083                 goto err_up_sem;
1084         }
1085
1086         ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1087         if (ret)
1088                 goto err_up_sem;
1089
1090         filp->private_data = port;
1091
1092         nonseekable_open(inode, filp);
1093         return 0;
1094
1095 err_up_sem:
1096         up(&port->sm_sem);
1097
1098 fail:
1099         return ret;
1100 }
1101
1102 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
1103 {
1104         struct ib_umad_port *port = filp->private_data;
1105         struct ib_port_modify props = {
1106                 .clr_port_cap_mask = IB_PORT_SM
1107         };
1108         int ret = 0;
1109
1110         mutex_lock(&port->file_mutex);
1111         if (port->ib_dev)
1112                 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1113         mutex_unlock(&port->file_mutex);
1114
1115         up(&port->sm_sem);
1116
1117         return ret;
1118 }
1119
1120 static const struct file_operations umad_sm_fops = {
1121         .owner   = THIS_MODULE,
1122         .open    = ib_umad_sm_open,
1123         .release = ib_umad_sm_close,
1124         .llseek  = no_llseek,
1125 };
1126
1127 static struct ib_client umad_client = {
1128         .name   = "umad",
1129         .add    = ib_umad_add_one,
1130         .remove = ib_umad_remove_one
1131 };
1132
1133 static ssize_t ibdev_show(struct device *dev, struct device_attribute *attr,
1134                           char *buf)
1135 {
1136         struct ib_umad_port *port = dev_get_drvdata(dev);
1137
1138         if (!port)
1139                 return -ENODEV;
1140
1141         return sprintf(buf, "%s\n", dev_name(&port->ib_dev->dev));
1142 }
1143 static DEVICE_ATTR_RO(ibdev);
1144
1145 static ssize_t port_show(struct device *dev, struct device_attribute *attr,
1146                          char *buf)
1147 {
1148         struct ib_umad_port *port = dev_get_drvdata(dev);
1149
1150         if (!port)
1151                 return -ENODEV;
1152
1153         return sprintf(buf, "%d\n", port->port_num);
1154 }
1155 static DEVICE_ATTR_RO(port);
1156
1157 static struct attribute *umad_class_dev_attrs[] = {
1158         &dev_attr_ibdev.attr,
1159         &dev_attr_port.attr,
1160         NULL,
1161 };
1162 ATTRIBUTE_GROUPS(umad_class_dev);
1163
1164 static char *umad_devnode(struct device *dev, umode_t *mode)
1165 {
1166         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1167 }
1168
1169 static ssize_t abi_version_show(struct class *class,
1170                                 struct class_attribute *attr, char *buf)
1171 {
1172         return sprintf(buf, "%d\n", IB_USER_MAD_ABI_VERSION);
1173 }
1174 static CLASS_ATTR_RO(abi_version);
1175
1176 static struct attribute *umad_class_attrs[] = {
1177         &class_attr_abi_version.attr,
1178         NULL,
1179 };
1180 ATTRIBUTE_GROUPS(umad_class);
1181
1182 static struct class umad_class = {
1183         .name           = "infiniband_mad",
1184         .devnode        = umad_devnode,
1185         .class_groups   = umad_class_groups,
1186         .dev_groups     = umad_class_dev_groups,
1187 };
1188
1189 static void ib_umad_release_port(struct device *device)
1190 {
1191         struct ib_umad_port *port = dev_get_drvdata(device);
1192         struct ib_umad_device *umad_dev = port->umad_dev;
1193
1194         ib_umad_dev_put(umad_dev);
1195 }
1196
1197 static void ib_umad_init_port_dev(struct device *dev,
1198                                   struct ib_umad_port *port,
1199                                   const struct ib_device *device)
1200 {
1201         device_initialize(dev);
1202         ib_umad_dev_get(port->umad_dev);
1203         dev->class = &umad_class;
1204         dev->parent = device->dev.parent;
1205         dev_set_drvdata(dev, port);
1206         dev->release = ib_umad_release_port;
1207 }
1208
1209 static int ib_umad_init_port(struct ib_device *device, int port_num,
1210                              struct ib_umad_device *umad_dev,
1211                              struct ib_umad_port *port)
1212 {
1213         int devnum;
1214         dev_t base_umad;
1215         dev_t base_issm;
1216         int ret;
1217
1218         devnum = ida_alloc_max(&umad_ida, IB_UMAD_MAX_PORTS - 1, GFP_KERNEL);
1219         if (devnum < 0)
1220                 return -1;
1221         port->dev_num = devnum;
1222         if (devnum >= IB_UMAD_NUM_FIXED_MINOR) {
1223                 base_umad = dynamic_umad_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;
1224                 base_issm = dynamic_issm_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;
1225         } else {
1226                 base_umad = devnum + base_umad_dev;
1227                 base_issm = devnum + base_issm_dev;
1228         }
1229
1230         port->ib_dev   = device;
1231         port->umad_dev = umad_dev;
1232         port->port_num = port_num;
1233         sema_init(&port->sm_sem, 1);
1234         mutex_init(&port->file_mutex);
1235         INIT_LIST_HEAD(&port->file_list);
1236
1237         ib_umad_init_port_dev(&port->dev, port, device);
1238         port->dev.devt = base_umad;
1239         dev_set_name(&port->dev, "umad%d", port->dev_num);
1240         cdev_init(&port->cdev, &umad_fops);
1241         port->cdev.owner = THIS_MODULE;
1242
1243         ret = cdev_device_add(&port->cdev, &port->dev);
1244         if (ret)
1245                 goto err_cdev;
1246
1247         ib_umad_init_port_dev(&port->sm_dev, port, device);
1248         port->sm_dev.devt = base_issm;
1249         dev_set_name(&port->sm_dev, "issm%d", port->dev_num);
1250         cdev_init(&port->sm_cdev, &umad_sm_fops);
1251         port->sm_cdev.owner = THIS_MODULE;
1252
1253         ret = cdev_device_add(&port->sm_cdev, &port->sm_dev);
1254         if (ret)
1255                 goto err_dev;
1256
1257         return 0;
1258
1259 err_dev:
1260         put_device(&port->sm_dev);
1261         cdev_device_del(&port->cdev, &port->dev);
1262 err_cdev:
1263         put_device(&port->dev);
1264         ida_free(&umad_ida, devnum);
1265         return ret;
1266 }
1267
1268 static void ib_umad_kill_port(struct ib_umad_port *port)
1269 {
1270         struct ib_umad_file *file;
1271         int id;
1272
1273         mutex_lock(&port->file_mutex);
1274
1275         /* Mark ib_dev NULL and block ioctl or other file ops to progress
1276          * further.
1277          */
1278         port->ib_dev = NULL;
1279
1280         list_for_each_entry(file, &port->file_list, port_list) {
1281                 mutex_lock(&file->mutex);
1282                 file->agents_dead = 1;
1283                 mutex_unlock(&file->mutex);
1284
1285                 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1286                         if (file->agent[id])
1287                                 ib_unregister_mad_agent(file->agent[id]);
1288         }
1289
1290         mutex_unlock(&port->file_mutex);
1291
1292         cdev_device_del(&port->sm_cdev, &port->sm_dev);
1293         cdev_device_del(&port->cdev, &port->dev);
1294         ida_free(&umad_ida, port->dev_num);
1295
1296         /* balances device_initialize() */
1297         put_device(&port->sm_dev);
1298         put_device(&port->dev);
1299 }
1300
1301 static void ib_umad_add_one(struct ib_device *device)
1302 {
1303         struct ib_umad_device *umad_dev;
1304         int s, e, i;
1305         int count = 0;
1306
1307         s = rdma_start_port(device);
1308         e = rdma_end_port(device);
1309
1310         umad_dev = kzalloc(struct_size(umad_dev, ports, e - s + 1), GFP_KERNEL);
1311         if (!umad_dev)
1312                 return;
1313
1314         kref_init(&umad_dev->kref);
1315         for (i = s; i <= e; ++i) {
1316                 if (!rdma_cap_ib_mad(device, i))
1317                         continue;
1318
1319                 if (ib_umad_init_port(device, i, umad_dev,
1320                                       &umad_dev->ports[i - s]))
1321                         goto err;
1322
1323                 count++;
1324         }
1325
1326         if (!count)
1327                 goto free;
1328
1329         ib_set_client_data(device, &umad_client, umad_dev);
1330
1331         return;
1332
1333 err:
1334         while (--i >= s) {
1335                 if (!rdma_cap_ib_mad(device, i))
1336                         continue;
1337
1338                 ib_umad_kill_port(&umad_dev->ports[i - s]);
1339         }
1340 free:
1341         /* balances kref_init */
1342         ib_umad_dev_put(umad_dev);
1343 }
1344
1345 static void ib_umad_remove_one(struct ib_device *device, void *client_data)
1346 {
1347         struct ib_umad_device *umad_dev = client_data;
1348         unsigned int i;
1349
1350         if (!umad_dev)
1351                 return;
1352
1353         rdma_for_each_port (device, i) {
1354                 if (rdma_cap_ib_mad(device, i))
1355                         ib_umad_kill_port(
1356                                 &umad_dev->ports[i - rdma_start_port(device)]);
1357         }
1358         /* balances kref_init() */
1359         ib_umad_dev_put(umad_dev);
1360 }
1361
1362 static int __init ib_umad_init(void)
1363 {
1364         int ret;
1365
1366         ret = register_chrdev_region(base_umad_dev,
1367                                      IB_UMAD_NUM_FIXED_MINOR * 2,
1368                                      umad_class.name);
1369         if (ret) {
1370                 pr_err("couldn't register device number\n");
1371                 goto out;
1372         }
1373
1374         ret = alloc_chrdev_region(&dynamic_umad_dev, 0,
1375                                   IB_UMAD_NUM_DYNAMIC_MINOR * 2,
1376                                   umad_class.name);
1377         if (ret) {
1378                 pr_err("couldn't register dynamic device number\n");
1379                 goto out_alloc;
1380         }
1381         dynamic_issm_dev = dynamic_umad_dev + IB_UMAD_NUM_DYNAMIC_MINOR;
1382
1383         ret = class_register(&umad_class);
1384         if (ret) {
1385                 pr_err("couldn't create class infiniband_mad\n");
1386                 goto out_chrdev;
1387         }
1388
1389         ret = ib_register_client(&umad_client);
1390         if (ret) {
1391                 pr_err("couldn't register ib_umad client\n");
1392                 goto out_class;
1393         }
1394
1395         return 0;
1396
1397 out_class:
1398         class_unregister(&umad_class);
1399
1400 out_chrdev:
1401         unregister_chrdev_region(dynamic_umad_dev,
1402                                  IB_UMAD_NUM_DYNAMIC_MINOR * 2);
1403
1404 out_alloc:
1405         unregister_chrdev_region(base_umad_dev,
1406                                  IB_UMAD_NUM_FIXED_MINOR * 2);
1407
1408 out:
1409         return ret;
1410 }
1411
1412 static void __exit ib_umad_cleanup(void)
1413 {
1414         ib_unregister_client(&umad_client);
1415         class_unregister(&umad_class);
1416         unregister_chrdev_region(base_umad_dev,
1417                                  IB_UMAD_NUM_FIXED_MINOR * 2);
1418         unregister_chrdev_region(dynamic_umad_dev,
1419                                  IB_UMAD_NUM_DYNAMIC_MINOR * 2);
1420 }
1421
1422 module_init(ib_umad_init);
1423 module_exit(ib_umad_cleanup);