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 #include <rdma/rdma_netlink.h>
  58
  59 #include "core_priv.h"
  60
  61 MODULE_AUTHOR("Roland Dreier");
  62 MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");
  63 MODULE_LICENSE("Dual BSD/GPL");
  64
  65 enum {
  66         IB_UMAD_MAX_PORTS  = RDMA_MAX_PORTS,
  67         IB_UMAD_MAX_AGENTS = 32,
  68
  69         IB_UMAD_MAJOR      = 231,
  70         IB_UMAD_MINOR_BASE = 0,
  71         IB_UMAD_NUM_FIXED_MINOR = 64,
  72         IB_UMAD_NUM_DYNAMIC_MINOR = IB_UMAD_MAX_PORTS - IB_UMAD_NUM_FIXED_MINOR,
  73         IB_ISSM_MINOR_BASE        = IB_UMAD_NUM_FIXED_MINOR,
  74 };
  75
  76 /*
  77  * Our lifetime rules for these structs are the following:
  78  * device special file is opened, we take a reference on the
  79  * ib_umad_port's struct ib_umad_device. We drop these
  80  * references in the corresponding close().
  81  *
  82  * In addition to references coming from open character devices, there
  83  * is one more reference to each ib_umad_device representing the
  84  * module's reference taken when allocating the ib_umad_device in
  85  * ib_umad_add_one().
  86  *
  87  * When destroying an ib_umad_device, we drop the module's reference.
  88  */
  89
  90 struct ib_umad_port {
  91         struct cdev           cdev;
  92         struct device         dev;
  93         struct cdev           sm_cdev;
  94         struct device         sm_dev;
  95         struct semaphore       sm_sem;
  96
  97         struct mutex           file_mutex;
  98         struct list_head       file_list;
  99
 100         struct ib_device      *ib_dev;
 101         struct ib_umad_device *umad_dev;
 102         int                    dev_num;
 103         u8                     port_num;
 104 };
 105
 106 struct ib_umad_device {
 107         struct kref kref;
 108         struct ib_umad_port ports[];
 109 };
 110
 111 struct ib_umad_file {
 112         struct mutex            mutex;
 113         struct ib_umad_port    *port;
 114         struct list_head        recv_list;
 115         struct list_head        send_list;
 116         struct list_head        port_list;
 117         spinlock_t              send_lock;
 118         wait_queue_head_t       recv_wait;
 119         struct ib_mad_agent    *agent[IB_UMAD_MAX_AGENTS];
 120         int                     agents_dead;
 121         u8                      use_pkey_index;
 122         u8                      already_used;
 123 };
 124
 125 struct ib_umad_packet {
 126         struct ib_mad_send_buf *msg;
 127         struct ib_mad_recv_wc  *recv_wc;
 128         struct list_head   list;
 129         int                length;
 130         struct ib_user_mad mad;
 131 };
 132
 133 #define CREATE_TRACE_POINTS
 134 #include <trace/events/ib_umad.h>
 135
 136 static const dev_t base_umad_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
 137 static const dev_t base_issm_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE) +
 138                                    IB_UMAD_NUM_FIXED_MINOR;
 139 static dev_t dynamic_umad_dev;
 140 static dev_t dynamic_issm_dev;
 141
 142 static DEFINE_IDA(umad_ida);
 143
 144 static void ib_umad_add_one(struct ib_device *device);
 145 static void ib_umad_remove_one(struct ib_device *device, void *client_data);
 146
 147 static void ib_umad_dev_free(struct kref *kref)
 148 {
 149         struct ib_umad_device *dev =
 150                 container_of(kref, struct ib_umad_device, kref);
 151
 152         kfree(dev);
 153 }
 154
 155 static void ib_umad_dev_get(struct ib_umad_device *dev)
 156 {
 157         kref_get(&dev->kref);
 158 }
 159
 160 static void ib_umad_dev_put(struct ib_umad_device *dev)
 161 {
 162         kref_put(&dev->kref, ib_umad_dev_free);
 163 }
 164
 165 static int hdr_size(struct ib_umad_file *file)
 166 {
 167         return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) :
 168                 sizeof (struct ib_user_mad_hdr_old);
 169 }
 170
 171 /* caller must hold file->mutex */
 172 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
 173 {
 174         return file->agents_dead ? NULL : file->agent[id];
 175 }
 176
 177 static int queue_packet(struct ib_umad_file *file,
 178                         struct ib_mad_agent *agent,
 179                         struct ib_umad_packet *packet)
 180 {
 181         int ret = 1;
 182
 183         mutex_lock(&file->mutex);
 184
 185         for (packet->mad.hdr.id = 0;
 186              packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
 187              packet->mad.hdr.id++)
 188                 if (agent == __get_agent(file, packet->mad.hdr.id)) {
 189                         list_add_tail(&packet->list, &file->recv_list);
 190                         wake_up_interruptible(&file->recv_wait);
 191                         ret = 0;
 192                         break;
 193                 }
 194
 195         mutex_unlock(&file->mutex);
 196
 197         return ret;
 198 }
 199
 200 static void dequeue_send(struct ib_umad_file *file,
 201                          struct ib_umad_packet *packet)
 202 {
 203         spin_lock_irq(&file->send_lock);
 204         list_del(&packet->list);
 205         spin_unlock_irq(&file->send_lock);
 206 }
 207
 208 static void send_handler(struct ib_mad_agent *agent,
 209                          struct ib_mad_send_wc *send_wc)
 210 {
 211         struct ib_umad_file *file = agent->context;
 212         struct ib_umad_packet *packet = send_wc->send_buf->context[0];
 213
 214         dequeue_send(file, packet);
 215         rdma_destroy_ah(packet->msg->ah, RDMA_DESTROY_AH_SLEEPABLE);
 216         ib_free_send_mad(packet->msg);
 217
 218         if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
 219                 packet->length = IB_MGMT_MAD_HDR;
 220                 packet->mad.hdr.status = ETIMEDOUT;
 221                 if (!queue_packet(file, agent, packet))
 222                         return;
 223         }
 224         kfree(packet);
 225 }
 226
 227 static void recv_handler(struct ib_mad_agent *agent,
 228                          struct ib_mad_send_buf *send_buf,
 229                          struct ib_mad_recv_wc *mad_recv_wc)
 230 {
 231         struct ib_umad_file *file = agent->context;
 232         struct ib_umad_packet *packet;
 233
 234         if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
 235                 goto err1;
 236
 237         packet = kzalloc(sizeof *packet, GFP_KERNEL);
 238         if (!packet)
 239                 goto err1;
 240
 241         packet->length = mad_recv_wc->mad_len;
 242         packet->recv_wc = mad_recv_wc;
 243
 244         packet->mad.hdr.status     = 0;
 245         packet->mad.hdr.length     = hdr_size(file) + mad_recv_wc->mad_len;
 246         packet->mad.hdr.qpn        = cpu_to_be32(mad_recv_wc->wc->src_qp);
 247         /*
 248          * On OPA devices it is okay to lose the upper 16 bits of LID as this
 249          * information is obtained elsewhere. Mask off the upper 16 bits.
 250          */
 251         if (rdma_cap_opa_mad(agent->device, agent->port_num))
 252                 packet->mad.hdr.lid = ib_lid_be16(0xFFFF &
 253                                                   mad_recv_wc->wc->slid);
 254         else
 255                 packet->mad.hdr.lid = ib_lid_be16(mad_recv_wc->wc->slid);
 256         packet->mad.hdr.sl         = mad_recv_wc->wc->sl;
 257         packet->mad.hdr.path_bits  = mad_recv_wc->wc->dlid_path_bits;
 258         packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;
 259         packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
 260         if (packet->mad.hdr.grh_present) {
 261                 struct rdma_ah_attr ah_attr;
 262                 const struct ib_global_route *grh;
 263                 int ret;
 264
 265                 ret = ib_init_ah_attr_from_wc(agent->device, agent->port_num,
 266                                               mad_recv_wc->wc,
 267                                               mad_recv_wc->recv_buf.grh,
 268                                               &ah_attr);
 269                 if (ret)
 270                         goto err2;
 271
 272                 grh = rdma_ah_read_grh(&ah_attr);
 273                 packet->mad.hdr.gid_index = grh->sgid_index;
 274                 packet->mad.hdr.hop_limit = grh->hop_limit;
 275                 packet->mad.hdr.traffic_class = grh->traffic_class;
 276                 memcpy(packet->mad.hdr.gid, &grh->dgid, 16);
 277                 packet->mad.hdr.flow_label = cpu_to_be32(grh->flow_label);
 278                 rdma_destroy_ah_attr(&ah_attr);
 279         }
 280
 281         if (queue_packet(file, agent, packet))
 282                 goto err2;
 283         return;
 284
 285 err2:
 286         kfree(packet);
 287 err1:
 288         ib_free_recv_mad(mad_recv_wc);
 289 }
 290
 291 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
 292                              struct ib_umad_packet *packet, size_t count)
 293 {
 294         struct ib_mad_recv_buf *recv_buf;
 295         int left, seg_payload, offset, max_seg_payload;
 296         size_t seg_size;
 297
 298         recv_buf = &packet->recv_wc->recv_buf;
 299         seg_size = packet->recv_wc->mad_seg_size;
 300
 301         /* We need enough room to copy the first (or only) MAD segment. */
 302         if ((packet->length <= seg_size &&
 303              count < hdr_size(file) + packet->length) ||
 304             (packet->length > seg_size &&
 305              count < hdr_size(file) + seg_size))
 306                 return -EINVAL;
 307
 308         if (copy_to_user(buf, &packet->mad, hdr_size(file)))
 309                 return -EFAULT;
 310
 311         buf += hdr_size(file);
 312         seg_payload = min_t(int, packet->length, seg_size);
 313         if (copy_to_user(buf, recv_buf->mad, seg_payload))
 314                 return -EFAULT;
 315
 316         if (seg_payload < packet->length) {
 317                 /*
 318                  * Multipacket RMPP MAD message. Copy remainder of message.
 319                  * Note that last segment may have a shorter payload.
 320                  */
 321                 if (count < hdr_size(file) + packet->length) {
 322                         /*
 323                          * The buffer is too small, return the first RMPP segment,
 324                          * which includes the RMPP message length.
 325                          */
 326                         return -ENOSPC;
 327                 }
 328                 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
 329                 max_seg_payload = seg_size - offset;
 330
 331                 for (left = packet->length - seg_payload, buf += seg_payload;
 332                      left; left -= seg_payload, buf += seg_payload) {
 333                         recv_buf = container_of(recv_buf->list.next,
 334                                                 struct ib_mad_recv_buf, list);
 335                         seg_payload = min(left, max_seg_payload);
 336                         if (copy_to_user(buf, ((void *) recv_buf->mad) + offset,
 337                                          seg_payload))
 338                                 return -EFAULT;
 339                 }
 340         }
 341
 342         trace_ib_umad_read_recv(file, &packet->mad.hdr, &recv_buf->mad->mad_hdr);
 343
 344         return hdr_size(file) + packet->length;
 345 }
 346
 347 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
 348                              struct ib_umad_packet *packet, size_t count)
 349 {
 350         ssize_t size = hdr_size(file) + packet->length;
 351
 352         if (count < size)
 353                 return -EINVAL;
 354
 355         if (copy_to_user(buf, &packet->mad, hdr_size(file)))
 356                 return -EFAULT;
 357
 358         buf += hdr_size(file);
 359
 360         if (copy_to_user(buf, packet->mad.data, packet->length))
 361                 return -EFAULT;
 362
 363         trace_ib_umad_read_send(file, &packet->mad.hdr,
 364                                 (struct ib_mad_hdr *)&packet->mad.data);
 365
 366         return size;
 367 }
 368
 369 static ssize_t ib_umad_read(struct file *filp, char __user *buf,
 370                             size_t count, loff_t *pos)
 371 {
 372         struct ib_umad_file *file = filp->private_data;
 373         struct ib_umad_packet *packet;
 374         ssize_t ret;
 375
 376         if (count < hdr_size(file))
 377                 return -EINVAL;
 378
 379         mutex_lock(&file->mutex);
 380
 381         while (list_empty(&file->recv_list)) {
 382                 mutex_unlock(&file->mutex);
 383
 384                 if (filp->f_flags & O_NONBLOCK)
 385                         return -EAGAIN;
 386
 387                 if (wait_event_interruptible(file->recv_wait,
 388                                              !list_empty(&file->recv_list)))
 389                         return -ERESTARTSYS;
 390
 391                 mutex_lock(&file->mutex);
 392         }
 393
 394         packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
 395         list_del(&packet->list);
 396
 397         mutex_unlock(&file->mutex);
 398
 399         if (packet->recv_wc)
 400                 ret = copy_recv_mad(file, buf, packet, count);
 401         else
 402                 ret = copy_send_mad(file, buf, packet, count);
 403
 404         if (ret < 0) {
 405                 /* Requeue packet */
 406                 mutex_lock(&file->mutex);
 407                 list_add(&packet->list, &file->recv_list);
 408                 mutex_unlock(&file->mutex);
 409         } else {
 410                 if (packet->recv_wc)
 411                         ib_free_recv_mad(packet->recv_wc);
 412                 kfree(packet);
 413         }
 414         return ret;
 415 }
 416
 417 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
 418 {
 419         int left, seg;
 420
 421         /* Copy class specific header */
 422         if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
 423             copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
 424                            msg->hdr_len - IB_MGMT_RMPP_HDR))
 425                 return -EFAULT;
 426
 427         /* All headers are in place.  Copy data segments. */
 428         for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
 429              seg++, left -= msg->seg_size, buf += msg->seg_size) {
 430                 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
 431                                    min(left, msg->seg_size)))
 432                         return -EFAULT;
 433         }
 434         return 0;
 435 }
 436
 437 static int same_destination(struct ib_user_mad_hdr *hdr1,
 438                             struct ib_user_mad_hdr *hdr2)
 439 {
 440         if (!hdr1->grh_present && !hdr2->grh_present)
 441            return (hdr1->lid == hdr2->lid);
 442
 443         if (hdr1->grh_present && hdr2->grh_present)
 444            return !memcmp(hdr1->gid, hdr2->gid, 16);
 445
 446         return 0;
 447 }
 448
 449 static int is_duplicate(struct ib_umad_file *file,
 450                         struct ib_umad_packet *packet)
 451 {
 452         struct ib_umad_packet *sent_packet;
 453         struct ib_mad_hdr *sent_hdr, *hdr;
 454
 455         hdr = (struct ib_mad_hdr *) packet->mad.data;
 456         list_for_each_entry(sent_packet, &file->send_list, list) {
 457                 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
 458
 459                 if ((hdr->tid != sent_hdr->tid) ||
 460                     (hdr->mgmt_class != sent_hdr->mgmt_class))
 461                         continue;
 462
 463                 /*
 464                  * No need to be overly clever here.  If two new operations have
 465                  * the same TID, reject the second as a duplicate.  This is more
 466                  * restrictive than required by the spec.
 467                  */
 468                 if (!ib_response_mad(hdr)) {
 469                         if (!ib_response_mad(sent_hdr))
 470                                 return 1;
 471                         continue;
 472                 } else if (!ib_response_mad(sent_hdr))
 473                         continue;
 474
 475                 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
 476                         return 1;
 477         }
 478
 479         return 0;
 480 }
 481
 482 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
 483                              size_t count, loff_t *pos)
 484 {
 485         struct ib_umad_file *file = filp->private_data;
 486         struct ib_umad_packet *packet;
 487         struct ib_mad_agent *agent;
 488         struct rdma_ah_attr ah_attr;
 489         struct ib_ah *ah;
 490         struct ib_rmpp_mad *rmpp_mad;
 491         __be64 *tid;
 492         int ret, data_len, hdr_len, copy_offset, rmpp_active;
 493         u8 base_version;
 494
 495         if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
 496                 return -EINVAL;
 497
 498         packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
 499         if (!packet)
 500                 return -ENOMEM;
 501
 502         if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
 503                 ret = -EFAULT;
 504                 goto err;
 505         }
 506
 507         if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
 508                 ret = -EINVAL;
 509                 goto err;
 510         }
 511
 512         buf += hdr_size(file);
 513
 514         if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
 515                 ret = -EFAULT;
 516                 goto err;
 517         }
 518
 519         mutex_lock(&file->mutex);
 520
 521         trace_ib_umad_write(file, &packet->mad.hdr,
 522                             (struct ib_mad_hdr *)&packet->mad.data);
 523
 524         agent = __get_agent(file, packet->mad.hdr.id);
 525         if (!agent) {
 526                 ret = -EINVAL;
 527                 goto err_up;
 528         }
 529
 530         memset(&ah_attr, 0, sizeof ah_attr);
 531         ah_attr.type = rdma_ah_find_type(agent->device,
 532                                          file->port->port_num);
 533         rdma_ah_set_dlid(&ah_attr, be16_to_cpu(packet->mad.hdr.lid));
 534         rdma_ah_set_sl(&ah_attr, packet->mad.hdr.sl);
 535         rdma_ah_set_path_bits(&ah_attr, packet->mad.hdr.path_bits);
 536         rdma_ah_set_port_num(&ah_attr, file->port->port_num);
 537         if (packet->mad.hdr.grh_present) {
 538                 rdma_ah_set_grh(&ah_attr, NULL,
 539                                 be32_to_cpu(packet->mad.hdr.flow_label),
 540                                 packet->mad.hdr.gid_index,
 541                                 packet->mad.hdr.hop_limit,
 542                                 packet->mad.hdr.traffic_class);
 543                 rdma_ah_set_dgid_raw(&ah_attr, packet->mad.hdr.gid);
 544         }
 545
 546         ah = rdma_create_user_ah(agent->qp->pd, &ah_attr, NULL);
 547         if (IS_ERR(ah)) {
 548                 ret = PTR_ERR(ah);
 549                 goto err_up;
 550         }
 551
 552         rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
 553         hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
 554
 555         if (ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
 556             && ib_mad_kernel_rmpp_agent(agent)) {
 557                 copy_offset = IB_MGMT_RMPP_HDR;
 558                 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 559                                                 IB_MGMT_RMPP_FLAG_ACTIVE;
 560         } else {
 561                 copy_offset = IB_MGMT_MAD_HDR;
 562                 rmpp_active = 0;
 563         }
 564
 565         base_version = ((struct ib_mad_hdr *)&packet->mad.data)->base_version;
 566         data_len = count - hdr_size(file) - hdr_len;
 567         packet->msg = ib_create_send_mad(agent,
 568                                          be32_to_cpu(packet->mad.hdr.qpn),
 569                                          packet->mad.hdr.pkey_index, rmpp_active,
 570                                          hdr_len, data_len, GFP_KERNEL,
 571                                          base_version);
 572         if (IS_ERR(packet->msg)) {
 573                 ret = PTR_ERR(packet->msg);
 574                 goto err_ah;
 575         }
 576
 577         packet->msg->ah         = ah;
 578         packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
 579         packet->msg->retries    = packet->mad.hdr.retries;
 580         packet->msg->context[0] = packet;
 581
 582         /* Copy MAD header.  Any RMPP header is already in place. */
 583         memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
 584
 585         if (!rmpp_active) {
 586                 if (copy_from_user(packet->msg->mad + copy_offset,
 587                                    buf + copy_offset,
 588                                    hdr_len + data_len - copy_offset)) {
 589                         ret = -EFAULT;
 590                         goto err_msg;
 591                 }
 592         } else {
 593                 ret = copy_rmpp_mad(packet->msg, buf);
 594                 if (ret)
 595                         goto err_msg;
 596         }
 597
 598         /*
 599          * Set the high-order part of the transaction ID to make MADs from
 600          * different agents unique, and allow routing responses back to the
 601          * original requestor.
 602          */
 603         if (!ib_response_mad(packet->msg->mad)) {
 604                 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
 605                 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
 606                                    (be64_to_cpup(tid) & 0xffffffff));
 607                 rmpp_mad->mad_hdr.tid = *tid;
 608         }
 609
 610         if (!ib_mad_kernel_rmpp_agent(agent)
 611            && ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
 612            && (ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE)) {
 613                 spin_lock_irq(&file->send_lock);
 614                 list_add_tail(&packet->list, &file->send_list);
 615                 spin_unlock_irq(&file->send_lock);
 616         } else {
 617                 spin_lock_irq(&file->send_lock);
 618                 ret = is_duplicate(file, packet);
 619                 if (!ret)
 620                         list_add_tail(&packet->list, &file->send_list);
 621                 spin_unlock_irq(&file->send_lock);
 622                 if (ret) {
 623                         ret = -EINVAL;
 624                         goto err_msg;
 625                 }
 626         }
 627
 628         ret = ib_post_send_mad(packet->msg, NULL);
 629         if (ret)
 630                 goto err_send;
 631
 632         mutex_unlock(&file->mutex);
 633         return count;
 634
 635 err_send:
 636         dequeue_send(file, packet);
 637 err_msg:
 638         ib_free_send_mad(packet->msg);
 639 err_ah:
 640         rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);
 641 err_up:
 642         mutex_unlock(&file->mutex);
 643 err:
 644         kfree(packet);
 645         return ret;
 646 }
 647
 648 static __poll_t ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
 649 {
 650         struct ib_umad_file *file = filp->private_data;
 651
 652         /* we will always be able to post a MAD send */
 653         __poll_t mask = EPOLLOUT | EPOLLWRNORM;
 654
 655         poll_wait(filp, &file->recv_wait, wait);
 656
 657         if (!list_empty(&file->recv_list))
 658                 mask |= EPOLLIN | EPOLLRDNORM;
 659
 660         return mask;
 661 }
 662
 663 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
 664                              int compat_method_mask)
 665 {
 666         struct ib_user_mad_reg_req ureq;
 667         struct ib_mad_reg_req req;
 668         struct ib_mad_agent *agent = NULL;
 669         int agent_id;
 670         int ret;
 671
 672         mutex_lock(&file->port->file_mutex);
 673         mutex_lock(&file->mutex);
 674
 675         if (!file->port->ib_dev) {
 676                 dev_notice(&file->port->dev,
 677                            "ib_umad_reg_agent: invalid device\n");
 678                 ret = -EPIPE;
 679                 goto out;
 680         }
 681
 682         if (copy_from_user(&ureq, arg, sizeof ureq)) {
 683                 ret = -EFAULT;
 684                 goto out;
 685         }
 686
 687         if (ureq.qpn != 0 && ureq.qpn != 1) {
 688                 dev_notice(&file->port->dev,
 689                            "ib_umad_reg_agent: invalid QPN %d specified\n",
 690                            ureq.qpn);
 691                 ret = -EINVAL;
 692                 goto out;
 693         }
 694
 695         for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
 696                 if (!__get_agent(file, agent_id))
 697                         goto found;
 698
 699         dev_notice(&file->port->dev,
 700                    "ib_umad_reg_agent: Max Agents (%u) reached\n",
 701                    IB_UMAD_MAX_AGENTS);
 702         ret = -ENOMEM;
 703         goto out;
 704
 705 found:
 706         if (ureq.mgmt_class) {
 707                 memset(&req, 0, sizeof(req));
 708                 req.mgmt_class         = ureq.mgmt_class;
 709                 req.mgmt_class_version = ureq.mgmt_class_version;
 710                 memcpy(req.oui, ureq.oui, sizeof req.oui);
 711
 712                 if (compat_method_mask) {
 713                         u32 *umm = (u32 *) ureq.method_mask;
 714                         int i;
 715
 716                         for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
 717                                 req.method_mask[i] =
 718                                         umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
 719                 } else
 720                         memcpy(req.method_mask, ureq.method_mask,
 721                                sizeof req.method_mask);
 722         }
 723
 724         agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
 725                                       ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
 726                                       ureq.mgmt_class ? &req : NULL,
 727                                       ureq.rmpp_version,
 728                                       send_handler, recv_handler, file, 0);
 729         if (IS_ERR(agent)) {
 730                 ret = PTR_ERR(agent);
 731                 agent = NULL;
 732                 goto out;
 733         }
 734
 735         if (put_user(agent_id,
 736                      (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
 737                 ret = -EFAULT;
 738                 goto out;
 739         }
 740
 741         if (!file->already_used) {
 742                 file->already_used = 1;
 743                 if (!file->use_pkey_index) {
 744                         dev_warn(&file->port->dev,
 745                                 "process %s did not enable P_Key index support.\n",
 746                                 current->comm);
 747                         dev_warn(&file->port->dev,
 748                                 "   Documentation/infiniband/user_mad.rst has info on the new ABI.\n");
 749                 }
 750         }
 751
 752         file->agent[agent_id] = agent;
 753         ret = 0;
 754
 755 out:
 756         mutex_unlock(&file->mutex);
 757
 758         if (ret && agent)
 759                 ib_unregister_mad_agent(agent);
 760
 761         mutex_unlock(&file->port->file_mutex);
 762
 763         return ret;
 764 }
 765
 766 static int ib_umad_reg_agent2(struct ib_umad_file *file, void __user *arg)
 767 {
 768         struct ib_user_mad_reg_req2 ureq;
 769         struct ib_mad_reg_req req;
 770         struct ib_mad_agent *agent = NULL;
 771         int agent_id;
 772         int ret;
 773
 774         mutex_lock(&file->port->file_mutex);
 775         mutex_lock(&file->mutex);
 776
 777         if (!file->port->ib_dev) {
 778                 dev_notice(&file->port->dev,
 779                            "ib_umad_reg_agent2: invalid device\n");
 780                 ret = -EPIPE;
 781                 goto out;
 782         }
 783
 784         if (copy_from_user(&ureq, arg, sizeof(ureq))) {
 785                 ret = -EFAULT;
 786                 goto out;
 787         }
 788
 789         if (ureq.qpn != 0 && ureq.qpn != 1) {
 790                 dev_notice(&file->port->dev,
 791                            "ib_umad_reg_agent2: invalid QPN %d specified\n",
 792                            ureq.qpn);
 793                 ret = -EINVAL;
 794                 goto out;
 795         }
 796
 797         if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) {
 798                 dev_notice(&file->port->dev,
 799                            "ib_umad_reg_agent2 failed: invalid registration flags specified 0x%x; supported 0x%x\n",
 800                            ureq.flags, IB_USER_MAD_REG_FLAGS_CAP);
 801                 ret = -EINVAL;
 802
 803                 if (put_user((u32)IB_USER_MAD_REG_FLAGS_CAP,
 804                                 (u32 __user *) (arg + offsetof(struct
 805                                 ib_user_mad_reg_req2, flags))))
 806                         ret = -EFAULT;
 807
 808                 goto out;
 809         }
 810
 811         for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
 812                 if (!__get_agent(file, agent_id))
 813                         goto found;
 814
 815         dev_notice(&file->port->dev,
 816                    "ib_umad_reg_agent2: Max Agents (%u) reached\n",
 817                    IB_UMAD_MAX_AGENTS);
 818         ret = -ENOMEM;
 819         goto out;
 820
 821 found:
 822         if (ureq.mgmt_class) {
 823                 memset(&req, 0, sizeof(req));
 824                 req.mgmt_class         = ureq.mgmt_class;
 825                 req.mgmt_class_version = ureq.mgmt_class_version;
 826                 if (ureq.oui & 0xff000000) {
 827                         dev_notice(&file->port->dev,
 828                                    "ib_umad_reg_agent2 failed: oui invalid 0x%08x\n",
 829                                    ureq.oui);
 830                         ret = -EINVAL;
 831                         goto out;
 832                 }
 833                 req.oui[2] =  ureq.oui & 0x0000ff;
 834                 req.oui[1] = (ureq.oui & 0x00ff00) >> 8;
 835                 req.oui[0] = (ureq.oui & 0xff0000) >> 16;
 836                 memcpy(req.method_mask, ureq.method_mask,
 837                         sizeof(req.method_mask));
 838         }
 839
 840         agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
 841                                       ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
 842                                       ureq.mgmt_class ? &req : NULL,
 843                                       ureq.rmpp_version,
 844                                       send_handler, recv_handler, file,
 845                                       ureq.flags);
 846         if (IS_ERR(agent)) {
 847                 ret = PTR_ERR(agent);
 848                 agent = NULL;
 849                 goto out;
 850         }
 851
 852         if (put_user(agent_id,
 853                      (u32 __user *)(arg +
 854                                 offsetof(struct ib_user_mad_reg_req2, id)))) {
 855                 ret = -EFAULT;
 856                 goto out;
 857         }
 858
 859         if (!file->already_used) {
 860                 file->already_used = 1;
 861                 file->use_pkey_index = 1;
 862         }
 863
 864         file->agent[agent_id] = agent;
 865         ret = 0;
 866
 867 out:
 868         mutex_unlock(&file->mutex);
 869
 870         if (ret && agent)
 871                 ib_unregister_mad_agent(agent);
 872
 873         mutex_unlock(&file->port->file_mutex);
 874
 875         return ret;
 876 }
 877
 878
 879 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
 880 {
 881         struct ib_mad_agent *agent = NULL;
 882         u32 id;
 883         int ret = 0;
 884
 885         if (get_user(id, arg))
 886                 return -EFAULT;
 887
 888         mutex_lock(&file->port->file_mutex);
 889         mutex_lock(&file->mutex);
 890
 891         if (id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
 892                 ret = -EINVAL;
 893                 goto out;
 894         }
 895
 896         agent = file->agent[id];
 897         file->agent[id] = NULL;
 898
 899 out:
 900         mutex_unlock(&file->mutex);
 901
 902         if (agent)
 903                 ib_unregister_mad_agent(agent);
 904
 905         mutex_unlock(&file->port->file_mutex);
 906
 907         return ret;
 908 }
 909
 910 static long ib_umad_enable_pkey(struct ib_umad_file *file)
 911 {
 912         int ret = 0;
 913
 914         mutex_lock(&file->mutex);
 915         if (file->already_used)
 916                 ret = -EINVAL;
 917         else
 918                 file->use_pkey_index = 1;
 919         mutex_unlock(&file->mutex);
 920
 921         return ret;
 922 }
 923
 924 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
 925                           unsigned long arg)
 926 {
 927         switch (cmd) {
 928         case IB_USER_MAD_REGISTER_AGENT:
 929                 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
 930         case IB_USER_MAD_UNREGISTER_AGENT:
 931                 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
 932         case IB_USER_MAD_ENABLE_PKEY:
 933                 return ib_umad_enable_pkey(filp->private_data);
 934         case IB_USER_MAD_REGISTER_AGENT2:
 935                 return ib_umad_reg_agent2(filp->private_data, (void __user *) arg);
 936         default:
 937                 return -ENOIOCTLCMD;
 938         }
 939 }
 940
 941 #ifdef CONFIG_COMPAT
 942 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
 943                                  unsigned long arg)
 944 {
 945         switch (cmd) {
 946         case IB_USER_MAD_REGISTER_AGENT:
 947                 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
 948         case IB_USER_MAD_UNREGISTER_AGENT:
 949                 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
 950         case IB_USER_MAD_ENABLE_PKEY:
 951                 return ib_umad_enable_pkey(filp->private_data);
 952         case IB_USER_MAD_REGISTER_AGENT2:
 953                 return ib_umad_reg_agent2(filp->private_data, compat_ptr(arg));
 954         default:
 955                 return -ENOIOCTLCMD;
 956         }
 957 }
 958 #endif
 959
 960 /*
 961  * ib_umad_open() does not need the BKL:
 962  *
 963  *  - the ib_umad_port structures are properly reference counted, and
 964  *    everything else is purely local to the file being created, so
 965  *    races against other open calls are not a problem;
 966  *  - the ioctl method does not affect any global state outside of the
 967  *    file structure being operated on;
 968  */
 969 static int ib_umad_open(struct inode *inode, struct file *filp)
 970 {
 971         struct ib_umad_port *port;
 972         struct ib_umad_file *file;
 973         int ret = 0;
 974
 975         port = container_of(inode->i_cdev, struct ib_umad_port, cdev);
 976
 977         mutex_lock(&port->file_mutex);
 978
 979         if (!port->ib_dev) {
 980                 ret = -ENXIO;
 981                 goto out;
 982         }
 983
 984         if (!rdma_dev_access_netns(port->ib_dev, current->nsproxy->net_ns)) {
 985                 ret = -EPERM;
 986                 goto out;
 987         }
 988
 989         file = kzalloc(sizeof(*file), GFP_KERNEL);
 990         if (!file) {
 991                 ret = -ENOMEM;
 992                 goto out;
 993         }
 994
 995         mutex_init(&file->mutex);
 996         spin_lock_init(&file->send_lock);
 997         INIT_LIST_HEAD(&file->recv_list);
 998         INIT_LIST_HEAD(&file->send_list);
 999         init_waitqueue_head(&file->recv_wait);
1000
1001         file->port = port;
1002         filp->private_data = file;
1003
1004         list_add_tail(&file->port_list, &port->file_list);
1005
1006         stream_open(inode, filp);
1007 out:
1008         mutex_unlock(&port->file_mutex);
1009         return ret;
1010 }
1011
1012 static int ib_umad_close(struct inode *inode, struct file *filp)
1013 {
1014         struct ib_umad_file *file = filp->private_data;
1015         struct ib_umad_packet *packet, *tmp;
1016         int already_dead;
1017         int i;
1018
1019         mutex_lock(&file->port->file_mutex);
1020         mutex_lock(&file->mutex);
1021
1022         already_dead = file->agents_dead;
1023         file->agents_dead = 1;
1024
1025         list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
1026                 if (packet->recv_wc)
1027                         ib_free_recv_mad(packet->recv_wc);
1028                 kfree(packet);
1029         }
1030
1031         list_del(&file->port_list);
1032
1033         mutex_unlock(&file->mutex);
1034
1035         if (!already_dead)
1036                 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
1037                         if (file->agent[i])
1038                                 ib_unregister_mad_agent(file->agent[i]);
1039
1040         mutex_unlock(&file->port->file_mutex);
1041
1042         kfree(file);
1043         return 0;
1044 }
1045
1046 static const struct file_operations umad_fops = {
1047         .owner          = THIS_MODULE,
1048         .read           = ib_umad_read,
1049         .write          = ib_umad_write,
1050         .poll           = ib_umad_poll,
1051         .unlocked_ioctl = ib_umad_ioctl,
1052 #ifdef CONFIG_COMPAT
1053         .compat_ioctl   = ib_umad_compat_ioctl,
1054 #endif
1055         .open           = ib_umad_open,
1056         .release        = ib_umad_close,
1057         .llseek         = no_llseek,
1058 };
1059
1060 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
1061 {
1062         struct ib_umad_port *port;
1063         struct ib_port_modify props = {
1064                 .set_port_cap_mask = IB_PORT_SM
1065         };
1066         int ret;
1067
1068         port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev);
1069
1070         if (filp->f_flags & O_NONBLOCK) {
1071                 if (down_trylock(&port->sm_sem)) {
1072                         ret = -EAGAIN;
1073                         goto fail;
1074                 }
1075         } else {
1076                 if (down_interruptible(&port->sm_sem)) {
1077                         ret = -ERESTARTSYS;
1078                         goto fail;
1079                 }
1080         }
1081
1082         if (!rdma_dev_access_netns(port->ib_dev, current->nsproxy->net_ns)) {
1083                 ret = -EPERM;
1084                 goto err_up_sem;
1085         }
1086
1087         ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1088         if (ret)
1089                 goto err_up_sem;
1090
1091         filp->private_data = port;
1092
1093         nonseekable_open(inode, filp);
1094         return 0;
1095
1096 err_up_sem:
1097         up(&port->sm_sem);
1098
1099 fail:
1100         return ret;
1101 }
1102
1103 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
1104 {
1105         struct ib_umad_port *port = filp->private_data;
1106         struct ib_port_modify props = {
1107                 .clr_port_cap_mask = IB_PORT_SM
1108         };
1109         int ret = 0;
1110
1111         mutex_lock(&port->file_mutex);
1112         if (port->ib_dev)
1113                 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1114         mutex_unlock(&port->file_mutex);
1115
1116         up(&port->sm_sem);
1117
1118         return ret;
1119 }
1120
1121 static const struct file_operations umad_sm_fops = {
1122         .owner   = THIS_MODULE,
1123         .open    = ib_umad_sm_open,
1124         .release = ib_umad_sm_close,
1125         .llseek  = no_llseek,
1126 };
1127
1128 static int ib_umad_get_nl_info(struct ib_device *ibdev, void *client_data,
1129                                struct ib_client_nl_info *res)
1130 {
1131         struct ib_umad_device *umad_dev = client_data;
1132
1133         if (!rdma_is_port_valid(ibdev, res->port))
1134                 return -EINVAL;
1135
1136         res->abi = IB_USER_MAD_ABI_VERSION;
1137         res->cdev = &umad_dev->ports[res->port - rdma_start_port(ibdev)].dev;
1138
1139         return 0;
1140 }
1141
1142 static struct ib_client umad_client = {
1143         .name   = "umad",
1144         .add    = ib_umad_add_one,
1145         .remove = ib_umad_remove_one,
1146         .get_nl_info = ib_umad_get_nl_info,
1147 };
1148 MODULE_ALIAS_RDMA_CLIENT("umad");
1149
1150 static int ib_issm_get_nl_info(struct ib_device *ibdev, void *client_data,
1151                                struct ib_client_nl_info *res)
1152 {
1153         struct ib_umad_device *umad_dev =
1154                 ib_get_client_data(ibdev, &umad_client);
1155
1156         if (!rdma_is_port_valid(ibdev, res->port))
1157                 return -EINVAL;
1158
1159         res->abi = IB_USER_MAD_ABI_VERSION;
1160         res->cdev = &umad_dev->ports[res->port - rdma_start_port(ibdev)].sm_dev;
1161
1162         return 0;
1163 }
1164
1165 static struct ib_client issm_client = {
1166         .name = "issm",
1167         .get_nl_info = ib_issm_get_nl_info,
1168 };
1169 MODULE_ALIAS_RDMA_CLIENT("issm");
1170
1171 static ssize_t ibdev_show(struct device *dev, struct device_attribute *attr,
1172                           char *buf)
1173 {
1174         struct ib_umad_port *port = dev_get_drvdata(dev);
1175
1176         if (!port)
1177                 return -ENODEV;
1178
1179         return sprintf(buf, "%s\n", dev_name(&port->ib_dev->dev));
1180 }
1181 static DEVICE_ATTR_RO(ibdev);
1182
1183 static ssize_t port_show(struct device *dev, struct device_attribute *attr,
1184                          char *buf)
1185 {
1186         struct ib_umad_port *port = dev_get_drvdata(dev);
1187
1188         if (!port)
1189                 return -ENODEV;
1190
1191         return sprintf(buf, "%d\n", port->port_num);
1192 }
1193 static DEVICE_ATTR_RO(port);
1194
1195 static struct attribute *umad_class_dev_attrs[] = {
1196         &dev_attr_ibdev.attr,
1197         &dev_attr_port.attr,
1198         NULL,
1199 };
1200 ATTRIBUTE_GROUPS(umad_class_dev);
1201
1202 static char *umad_devnode(struct device *dev, umode_t *mode)
1203 {
1204         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1205 }
1206
1207 static ssize_t abi_version_show(struct class *class,
1208                                 struct class_attribute *attr, char *buf)
1209 {
1210         return sprintf(buf, "%d\n", IB_USER_MAD_ABI_VERSION);
1211 }
1212 static CLASS_ATTR_RO(abi_version);
1213
1214 static struct attribute *umad_class_attrs[] = {
1215         &class_attr_abi_version.attr,
1216         NULL,
1217 };
1218 ATTRIBUTE_GROUPS(umad_class);
1219
1220 static struct class umad_class = {
1221         .name           = "infiniband_mad",
1222         .devnode        = umad_devnode,
1223         .class_groups   = umad_class_groups,
1224         .dev_groups     = umad_class_dev_groups,
1225 };
1226
1227 static void ib_umad_release_port(struct device *device)
1228 {
1229         struct ib_umad_port *port = dev_get_drvdata(device);
1230         struct ib_umad_device *umad_dev = port->umad_dev;
1231
1232         ib_umad_dev_put(umad_dev);
1233 }
1234
1235 static void ib_umad_init_port_dev(struct device *dev,
1236                                   struct ib_umad_port *port,
1237                                   const struct ib_device *device)
1238 {
1239         device_initialize(dev);
1240         ib_umad_dev_get(port->umad_dev);
1241         dev->class = &umad_class;
1242         dev->parent = device->dev.parent;
1243         dev_set_drvdata(dev, port);
1244         dev->release = ib_umad_release_port;
1245 }
1246
1247 static int ib_umad_init_port(struct ib_device *device, int port_num,
1248                              struct ib_umad_device *umad_dev,
1249                              struct ib_umad_port *port)
1250 {
1251         int devnum;
1252         dev_t base_umad;
1253         dev_t base_issm;
1254         int ret;
1255
1256         devnum = ida_alloc_max(&umad_ida, IB_UMAD_MAX_PORTS - 1, GFP_KERNEL);
1257         if (devnum < 0)
1258                 return -1;
1259         port->dev_num = devnum;
1260         if (devnum >= IB_UMAD_NUM_FIXED_MINOR) {
1261                 base_umad = dynamic_umad_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;
1262                 base_issm = dynamic_issm_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;
1263         } else {
1264                 base_umad = devnum + base_umad_dev;
1265                 base_issm = devnum + base_issm_dev;
1266         }
1267
1268         port->ib_dev   = device;
1269         port->umad_dev = umad_dev;
1270         port->port_num = port_num;
1271         sema_init(&port->sm_sem, 1);
1272         mutex_init(&port->file_mutex);
1273         INIT_LIST_HEAD(&port->file_list);
1274
1275         ib_umad_init_port_dev(&port->dev, port, device);
1276         port->dev.devt = base_umad;
1277         dev_set_name(&port->dev, "umad%d", port->dev_num);
1278         cdev_init(&port->cdev, &umad_fops);
1279         port->cdev.owner = THIS_MODULE;
1280
1281         ret = cdev_device_add(&port->cdev, &port->dev);
1282         if (ret)
1283                 goto err_cdev;
1284
1285         ib_umad_init_port_dev(&port->sm_dev, port, device);
1286         port->sm_dev.devt = base_issm;
1287         dev_set_name(&port->sm_dev, "issm%d", port->dev_num);
1288         cdev_init(&port->sm_cdev, &umad_sm_fops);
1289         port->sm_cdev.owner = THIS_MODULE;
1290
1291         ret = cdev_device_add(&port->sm_cdev, &port->sm_dev);
1292         if (ret)
1293                 goto err_dev;
1294
1295         return 0;
1296
1297 err_dev:
1298         put_device(&port->sm_dev);
1299         cdev_device_del(&port->cdev, &port->dev);
1300 err_cdev:
1301         put_device(&port->dev);
1302         ida_free(&umad_ida, devnum);
1303         return ret;
1304 }
1305
1306 static void ib_umad_kill_port(struct ib_umad_port *port)
1307 {
1308         struct ib_umad_file *file;
1309         int id;
1310
1311         mutex_lock(&port->file_mutex);
1312
1313         /* Mark ib_dev NULL and block ioctl or other file ops to progress
1314          * further.
1315          */
1316         port->ib_dev = NULL;
1317
1318         list_for_each_entry(file, &port->file_list, port_list) {
1319                 mutex_lock(&file->mutex);
1320                 file->agents_dead = 1;
1321                 mutex_unlock(&file->mutex);
1322
1323                 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1324                         if (file->agent[id])
1325                                 ib_unregister_mad_agent(file->agent[id]);
1326         }
1327
1328         mutex_unlock(&port->file_mutex);
1329
1330         cdev_device_del(&port->sm_cdev, &port->sm_dev);
1331         cdev_device_del(&port->cdev, &port->dev);
1332         ida_free(&umad_ida, port->dev_num);
1333
1334         /* balances device_initialize() */
1335         put_device(&port->sm_dev);
1336         put_device(&port->dev);
1337 }
1338
1339 static void ib_umad_add_one(struct ib_device *device)
1340 {
1341         struct ib_umad_device *umad_dev;
1342         int s, e, i;
1343         int count = 0;
1344
1345         s = rdma_start_port(device);
1346         e = rdma_end_port(device);
1347
1348         umad_dev = kzalloc(struct_size(umad_dev, ports, e - s + 1), GFP_KERNEL);
1349         if (!umad_dev)
1350                 return;
1351
1352         kref_init(&umad_dev->kref);
1353         for (i = s; i <= e; ++i) {
1354                 if (!rdma_cap_ib_mad(device, i))
1355                         continue;
1356
1357                 if (ib_umad_init_port(device, i, umad_dev,
1358                                       &umad_dev->ports[i - s]))
1359                         goto err;
1360
1361                 count++;
1362         }
1363
1364         if (!count)
1365                 goto free;
1366
1367         ib_set_client_data(device, &umad_client, umad_dev);
1368
1369         return;
1370
1371 err:
1372         while (--i >= s) {
1373                 if (!rdma_cap_ib_mad(device, i))
1374                         continue;
1375
1376                 ib_umad_kill_port(&umad_dev->ports[i - s]);
1377         }
1378 free:
1379         /* balances kref_init */
1380         ib_umad_dev_put(umad_dev);
1381 }
1382
1383 static void ib_umad_remove_one(struct ib_device *device, void *client_data)
1384 {
1385         struct ib_umad_device *umad_dev = client_data;
1386         unsigned int i;
1387
1388         if (!umad_dev)
1389                 return;
1390
1391         rdma_for_each_port (device, i) {
1392                 if (rdma_cap_ib_mad(device, i))
1393                         ib_umad_kill_port(
1394                                 &umad_dev->ports[i - rdma_start_port(device)]);
1395         }
1396         /* balances kref_init() */
1397         ib_umad_dev_put(umad_dev);
1398 }
1399
1400 static int __init ib_umad_init(void)
1401 {
1402         int ret;
1403
1404         ret = register_chrdev_region(base_umad_dev,
1405                                      IB_UMAD_NUM_FIXED_MINOR * 2,
1406                                      umad_class.name);
1407         if (ret) {
1408                 pr_err("couldn't register device number\n");
1409                 goto out;
1410         }
1411
1412         ret = alloc_chrdev_region(&dynamic_umad_dev, 0,
1413                                   IB_UMAD_NUM_DYNAMIC_MINOR * 2,
1414                                   umad_class.name);
1415         if (ret) {
1416                 pr_err("couldn't register dynamic device number\n");
1417                 goto out_alloc;
1418         }
1419         dynamic_issm_dev = dynamic_umad_dev + IB_UMAD_NUM_DYNAMIC_MINOR;
1420
1421         ret = class_register(&umad_class);
1422         if (ret) {
1423                 pr_err("couldn't create class infiniband_mad\n");
1424                 goto out_chrdev;
1425         }
1426
1427         ret = ib_register_client(&umad_client);
1428         if (ret)
1429                 goto out_class;
1430
1431         ret = ib_register_client(&issm_client);
1432         if (ret)
1433                 goto out_client;
1434
1435         return 0;
1436
1437 out_client:
1438         ib_unregister_client(&umad_client);
1439 out_class:
1440         class_unregister(&umad_class);
1441
1442 out_chrdev:
1443         unregister_chrdev_region(dynamic_umad_dev,
1444                                  IB_UMAD_NUM_DYNAMIC_MINOR * 2);
1445
1446 out_alloc:
1447         unregister_chrdev_region(base_umad_dev,
1448                                  IB_UMAD_NUM_FIXED_MINOR * 2);
1449
1450 out:
1451         return ret;
1452 }
1453
1454 static void __exit ib_umad_cleanup(void)
1455 {
1456         ib_unregister_client(&issm_client);
1457         ib_unregister_client(&umad_client);
1458         class_unregister(&umad_class);
1459         unregister_chrdev_region(base_umad_dev,
1460                                  IB_UMAD_NUM_FIXED_MINOR * 2);
1461         unregister_chrdev_region(dynamic_umad_dev,
1462                                  IB_UMAD_NUM_DYNAMIC_MINOR * 2);
1463 }
1464
1465 module_init(ib_umad_init);
1466 module_exit(ib_umad_cleanup);