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  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  *
  34  * $Id: user_mad.c 2814 2005-07-06 19:14:09Z halr $
  35  */
  36
  37 #include <linux/module.h>
  38 #include <linux/init.h>
  39 #include <linux/device.h>
  40 #include <linux/err.h>
  41 #include <linux/fs.h>
  42 #include <linux/cdev.h>
  43 #include <linux/pci.h>
  44 #include <linux/dma-mapping.h>
  45 #include <linux/poll.h>
  46 #include <linux/rwsem.h>
  47 #include <linux/kref.h>
  48
  49 #include <asm/uaccess.h>
  50 #include <asm/semaphore.h>
  51
  52 #include <ib_mad.h>
  53 #include <ib_user_mad.h>
  54
  55 MODULE_AUTHOR("Roland Dreier");
  56 MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");
  57 MODULE_LICENSE("Dual BSD/GPL");
  58
  59 enum {
  60         IB_UMAD_MAX_PORTS  = 64,
  61         IB_UMAD_MAX_AGENTS = 32,
  62
  63         IB_UMAD_MAJOR      = 231,
  64         IB_UMAD_MINOR_BASE = 0
  65 };
  66
  67 struct ib_umad_port {
  68         int                    devnum;
  69         struct cdev            dev;
  70         struct class_device    class_dev;
  71
  72         int                    sm_devnum;
  73         struct cdev            sm_dev;
  74         struct class_device    sm_class_dev;
  75         struct semaphore       sm_sem;
  76
  77         struct ib_device      *ib_dev;
  78         struct ib_umad_device *umad_dev;
  79         u8                     port_num;
  80 };
  81
  82 struct ib_umad_device {
  83         int                  start_port, end_port;
  84         struct kref          ref;
  85         struct ib_umad_port  port[0];
  86 };
  87
  88 struct ib_umad_file {
  89         struct ib_umad_port *port;
  90         spinlock_t           recv_lock;
  91         struct list_head     recv_list;
  92         wait_queue_head_t    recv_wait;
  93         struct rw_semaphore  agent_mutex;
  94         struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS];
  95         struct ib_mr        *mr[IB_UMAD_MAX_AGENTS];
  96 };
  97
  98 struct ib_umad_packet {
  99         struct ib_ah      *ah;
 100         struct ib_mad_send_buf *msg;
 101         struct list_head   list;
 102         int                length;
 103         DECLARE_PCI_UNMAP_ADDR(mapping)
 104         struct ib_user_mad mad;
 105 };
 106
 107 static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
 108 static spinlock_t map_lock;
 109 static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS * 2);
 110
 111 static void ib_umad_add_one(struct ib_device *device);
 112 static void ib_umad_remove_one(struct ib_device *device);
 113
 114 static int queue_packet(struct ib_umad_file *file,
 115                         struct ib_mad_agent *agent,
 116                         struct ib_umad_packet *packet)
 117 {
 118         int ret = 1;
 119
 120         down_read(&file->agent_mutex);
 121         for (packet->mad.hdr.id = 0;
 122              packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
 123              packet->mad.hdr.id++)
 124                 if (agent == file->agent[packet->mad.hdr.id]) {
 125                         spin_lock_irq(&file->recv_lock);
 126                         list_add_tail(&packet->list, &file->recv_list);
 127                         spin_unlock_irq(&file->recv_lock);
 128                         wake_up_interruptible(&file->recv_wait);
 129                         ret = 0;
 130                         break;
 131                 }
 132
 133         up_read(&file->agent_mutex);
 134
 135         return ret;
 136 }
 137
 138 static void send_handler(struct ib_mad_agent *agent,
 139                          struct ib_mad_send_wc *send_wc)
 140 {
 141         struct ib_umad_file *file = agent->context;
 142         struct ib_umad_packet *timeout, *packet =
 143                 (void *) (unsigned long) send_wc->wr_id;
 144
 145         ib_destroy_ah(packet->msg->send_wr.wr.ud.ah);
 146         ib_free_send_mad(packet->msg);
 147
 148         if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
 149                 timeout = kmalloc(sizeof *timeout + sizeof (struct ib_mad_hdr),
 150                                   GFP_KERNEL);
 151                 if (!timeout)
 152                         goto out;
 153
 154                 memset(timeout, 0, sizeof *timeout + sizeof (struct ib_mad_hdr));
 155
 156                 timeout->length = sizeof (struct ib_mad_hdr);
 157                 timeout->mad.hdr.id = packet->mad.hdr.id;
 158                 timeout->mad.hdr.status = ETIMEDOUT;
 159                 memcpy(timeout->mad.data, packet->mad.data,
 160                        sizeof (struct ib_mad_hdr));
 161
 162                 if (!queue_packet(file, agent, timeout))
 163                                 return;
 164         }
 165 out:
 166         kfree(packet);
 167 }
 168
 169 static void recv_handler(struct ib_mad_agent *agent,
 170                          struct ib_mad_recv_wc *mad_recv_wc)
 171 {
 172         struct ib_umad_file *file = agent->context;
 173         struct ib_umad_packet *packet;
 174         int length;
 175
 176         if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
 177                 goto out;
 178
 179         length = mad_recv_wc->mad_len;
 180         packet = kmalloc(sizeof *packet + length, GFP_KERNEL);
 181         if (!packet)
 182                 goto out;
 183
 184         memset(packet, 0, sizeof *packet + length);
 185         packet->length = length;
 186
 187         ib_coalesce_recv_mad(mad_recv_wc, packet->mad.data);
 188
 189         packet->mad.hdr.status    = 0;
 190         packet->mad.hdr.length    = length + sizeof (struct ib_user_mad);
 191         packet->mad.hdr.qpn       = cpu_to_be32(mad_recv_wc->wc->src_qp);
 192         packet->mad.hdr.lid       = cpu_to_be16(mad_recv_wc->wc->slid);
 193         packet->mad.hdr.sl        = mad_recv_wc->wc->sl;
 194         packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits;
 195         packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
 196         if (packet->mad.hdr.grh_present) {
 197                 /* XXX parse GRH */
 198                 packet->mad.hdr.gid_index       = 0;
 199                 packet->mad.hdr.hop_limit       = 0;
 200                 packet->mad.hdr.traffic_class   = 0;
 201                 memset(packet->mad.hdr.gid, 0, 16);
 202                 packet->mad.hdr.flow_label      = 0;
 203         }
 204
 205         if (queue_packet(file, agent, packet))
 206                 kfree(packet);
 207
 208 out:
 209         ib_free_recv_mad(mad_recv_wc);
 210 }
 211
 212 static ssize_t ib_umad_read(struct file *filp, char __user *buf,
 213                             size_t count, loff_t *pos)
 214 {
 215         struct ib_umad_file *file = filp->private_data;
 216         struct ib_umad_packet *packet;
 217         ssize_t ret;
 218
 219         if (count < sizeof (struct ib_user_mad) + sizeof (struct ib_mad))
 220                 return -EINVAL;
 221
 222         spin_lock_irq(&file->recv_lock);
 223
 224         while (list_empty(&file->recv_list)) {
 225                 spin_unlock_irq(&file->recv_lock);
 226
 227                 if (filp->f_flags & O_NONBLOCK)
 228                         return -EAGAIN;
 229
 230                 if (wait_event_interruptible(file->recv_wait,
 231                                              !list_empty(&file->recv_list)))
 232                         return -ERESTARTSYS;
 233
 234                 spin_lock_irq(&file->recv_lock);
 235         }
 236
 237         packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
 238         list_del(&packet->list);
 239
 240         spin_unlock_irq(&file->recv_lock);
 241
 242         if (count < packet->length + sizeof (struct ib_user_mad)) {
 243                 /* Return length needed (and first RMPP segment) if too small */
 244                 if (copy_to_user(buf, &packet->mad,
 245                                  sizeof (struct ib_user_mad) + sizeof (struct ib_mad)))
 246                         ret = -EFAULT;
 247                 else
 248                         ret = -ENOSPC;
 249         } else if (copy_to_user(buf, &packet->mad,
 250                               packet->length + sizeof (struct ib_user_mad)))
 251                 ret = -EFAULT;
 252         else
 253                 ret = packet->length + sizeof (struct ib_user_mad);
 254         if (ret < 0) {
 255                 /* Requeue packet */
 256                 spin_lock_irq(&file->recv_lock);
 257                 list_add(&packet->list, &file->recv_list);
 258                 spin_unlock_irq(&file->recv_lock);
 259         } else
 260                 kfree(packet);
 261         return ret;
 262 }
 263
 264 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
 265                              size_t count, loff_t *pos)
 266 {
 267         struct ib_umad_file *file = filp->private_data;
 268         struct ib_umad_packet *packet;
 269         struct ib_mad_agent *agent;
 270         struct ib_ah_attr ah_attr;
 271         struct ib_send_wr *bad_wr;
 272         struct ib_rmpp_mad *rmpp_mad;
 273         u8 method;
 274         u64 *tid;
 275         int ret, length, hdr_len, data_len, rmpp_hdr_size;
 276         int rmpp_active = 0;
 277
 278         if (count < sizeof (struct ib_user_mad))
 279                 return -EINVAL;
 280
 281         length = count - sizeof (struct ib_user_mad);
 282         packet = kmalloc(sizeof *packet + sizeof(struct ib_mad_hdr) +
 283                          sizeof(struct ib_rmpp_hdr), GFP_KERNEL);
 284         if (!packet)
 285                 return -ENOMEM;
 286
 287         if (copy_from_user(&packet->mad, buf,
 288                             sizeof (struct ib_user_mad) +
 289                             sizeof(struct ib_mad_hdr) +
 290                             sizeof(struct ib_rmpp_hdr))) {
 291                 ret = -EFAULT;
 292                 goto err;
 293         }
 294
 295         if (packet->mad.hdr.id < 0 ||
 296             packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
 297                 ret = -EINVAL;
 298                 goto err;
 299         }
 300
 301         packet->length = length;
 302
 303         down_read(&file->agent_mutex);
 304
 305         agent = file->agent[packet->mad.hdr.id];
 306         if (!agent) {
 307                 ret = -EINVAL;
 308                 goto err_up;
 309         }
 310
 311         memset(&ah_attr, 0, sizeof ah_attr);
 312         ah_attr.dlid          = be16_to_cpu(packet->mad.hdr.lid);
 313         ah_attr.sl            = packet->mad.hdr.sl;
 314         ah_attr.src_path_bits = packet->mad.hdr.path_bits;
 315         ah_attr.port_num      = file->port->port_num;
 316         if (packet->mad.hdr.grh_present) {
 317                 ah_attr.ah_flags = IB_AH_GRH;
 318                 memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16);
 319                 ah_attr.grh.flow_label     = packet->mad.hdr.flow_label;
 320                 ah_attr.grh.hop_limit      = packet->mad.hdr.hop_limit;
 321                 ah_attr.grh.traffic_class  = packet->mad.hdr.traffic_class;
 322         }
 323
 324         packet->ah = ib_create_ah(agent->qp->pd, &ah_attr);
 325         if (IS_ERR(packet->ah)) {
 326                 ret = PTR_ERR(packet->ah);
 327                 goto err_up;
 328         }
 329
 330         rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
 331         if (ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE) {
 332                 /* RMPP active */
 333                 if (!agent->rmpp_version) {
 334                         ret = -EINVAL;
 335                         goto err_ah;
 336                 }
 337                 /* Validate that management class can support RMPP */
 338                 if (rmpp_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_ADM) {
 339                         hdr_len = offsetof(struct ib_sa_mad, data);
 340                         data_len = length;
 341                 } else if ((rmpp_mad->mad_hdr.mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 342                             (rmpp_mad->mad_hdr.mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)) {
 343                                 hdr_len = offsetof(struct ib_vendor_mad, data);
 344                                 data_len = length - hdr_len;
 345                 } else {
 346                         ret = -EINVAL;
 347                         goto err_ah;
 348                 }
 349                 rmpp_active = 1;
 350         } else {
 351                 if (length > sizeof(struct ib_mad)) {
 352                         ret = -EINVAL;
 353                         goto err_ah;
 354                 }
 355                 hdr_len = offsetof(struct ib_mad, data);
 356                 data_len = length - hdr_len;
 357         }
 358
 359         packet->msg = ib_create_send_mad(agent,
 360                                          be32_to_cpu(packet->mad.hdr.qpn),
 361                                          0, packet->ah, rmpp_active,
 362                                          hdr_len, data_len,
 363                                          GFP_KERNEL);
 364         if (IS_ERR(packet->msg)) {
 365                 ret = PTR_ERR(packet->msg);
 366                 goto err_ah;
 367         }
 368
 369         packet->msg->send_wr.wr.ud.timeout_ms  = packet->mad.hdr.timeout_ms;
 370         packet->msg->send_wr.wr.ud.retries = packet->mad.hdr.retries;
 371
 372         /* Override send WR WRID initialized in ib_create_send_mad */
 373         packet->msg->send_wr.wr_id = (unsigned long) packet;
 374
 375         if (!rmpp_active) {
 376                 /* Copy message from user into send buffer */
 377                 if (copy_from_user(packet->msg->mad,
 378                                    buf + sizeof(struct ib_user_mad), length)) {
 379                         ret = -EFAULT;
 380                         goto err_msg;
 381                 }
 382         } else {
 383                 rmpp_hdr_size = sizeof(struct ib_mad_hdr) +
 384                                 sizeof(struct ib_rmpp_hdr);
 385
 386                 /* Only copy MAD headers (RMPP header in place) */
 387                 memcpy(packet->msg->mad, packet->mad.data,
 388                        sizeof(struct ib_mad_hdr));
 389
 390                 /* Now, copy rest of message from user into send buffer */
 391                 if (copy_from_user(((struct ib_rmpp_mad *) packet->msg->mad)->data,
 392                                    buf + sizeof (struct ib_user_mad) + rmpp_hdr_size,
 393                                    length - rmpp_hdr_size)) {
 394                         ret = -EFAULT;
 395                         goto err_msg;
 396                 }
 397         }
 398
 399         /*
 400          * If userspace is generating a request that will generate a
 401          * response, we need to make sure the high-order part of the
 402          * transaction ID matches the agent being used to send the
 403          * MAD.
 404          */
 405         method = packet->msg->mad->mad_hdr.method;
 406
 407         if (!(method & IB_MGMT_METHOD_RESP)       &&
 408             method != IB_MGMT_METHOD_TRAP_REPRESS &&
 409             method != IB_MGMT_METHOD_SEND) {
 410                 tid = &packet->msg->mad->mad_hdr.tid;
 411                 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
 412                                    (be64_to_cpup(tid) & 0xffffffff));
 413         }
 414
 415         ret = ib_post_send_mad(agent, &packet->msg->send_wr, &bad_wr);
 416         if (ret)
 417                 goto err_msg;
 418
 419         up_read(&file->agent_mutex);
 420
 421         return sizeof (struct ib_user_mad_hdr) + packet->length;
 422
 423 err_msg:
 424         ib_free_send_mad(packet->msg);
 425
 426 err_ah:
 427         ib_destroy_ah(packet->ah);
 428
 429 err_up:
 430         up_read(&file->agent_mutex);
 431
 432 err:
 433         kfree(packet);
 434         return ret;
 435 }
 436
 437 static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
 438 {
 439         struct ib_umad_file *file = filp->private_data;
 440
 441         /* we will always be able to post a MAD send */
 442         unsigned int mask = POLLOUT | POLLWRNORM;
 443
 444         poll_wait(filp, &file->recv_wait, wait);
 445
 446         if (!list_empty(&file->recv_list))
 447                 mask |= POLLIN | POLLRDNORM;
 448
 449         return mask;
 450 }
 451
 452 static int ib_umad_reg_agent(struct ib_umad_file *file, unsigned long arg)
 453 {
 454         struct ib_user_mad_reg_req ureq;
 455         struct ib_mad_reg_req req;
 456         struct ib_mad_agent *agent;
 457         int agent_id;
 458         int ret;
 459
 460         down_write(&file->agent_mutex);
 461
 462         if (copy_from_user(&ureq, (void __user *) arg, sizeof ureq)) {
 463                 ret = -EFAULT;
 464                 goto out;
 465         }
 466
 467         if (ureq.qpn != 0 && ureq.qpn != 1) {
 468                 ret = -EINVAL;
 469                 goto out;
 470         }
 471
 472         for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
 473                 if (!file->agent[agent_id])
 474                         goto found;
 475
 476         ret = -ENOMEM;
 477         goto out;
 478
 479 found:
 480         if (ureq.mgmt_class) {
 481                 req.mgmt_class         = ureq.mgmt_class;
 482                 req.mgmt_class_version = ureq.mgmt_class_version;
 483                 memcpy(req.method_mask, ureq.method_mask, sizeof req.method_mask);
 484                 memcpy(req.oui,         ureq.oui,         sizeof req.oui);
 485         }
 486
 487         agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
 488                                       ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
 489                                       ureq.mgmt_class ? &req : NULL,
 490                                       ureq.rmpp_version,
 491                                       send_handler, recv_handler, file);
 492         if (IS_ERR(agent)) {
 493                 ret = PTR_ERR(agent);
 494                 goto out;
 495         }
 496
 497         file->agent[agent_id] = agent;
 498
 499         file->mr[agent_id] = ib_get_dma_mr(agent->qp->pd, IB_ACCESS_LOCAL_WRITE);
 500         if (IS_ERR(file->mr[agent_id])) {
 501                 ret = -ENOMEM;
 502                 goto err;
 503         }
 504
 505         if (put_user(agent_id,
 506                      (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
 507                 ret = -EFAULT;
 508                 goto err_mr;
 509         }
 510
 511         ret = 0;
 512         goto out;
 513
 514 err_mr:
 515         ib_dereg_mr(file->mr[agent_id]);
 516
 517 err:
 518         file->agent[agent_id] = NULL;
 519         ib_unregister_mad_agent(agent);
 520
 521 out:
 522         up_write(&file->agent_mutex);
 523         return ret;
 524 }
 525
 526 static int ib_umad_unreg_agent(struct ib_umad_file *file, unsigned long arg)
 527 {
 528         u32 id;
 529         int ret = 0;
 530
 531         down_write(&file->agent_mutex);
 532
 533         if (get_user(id, (u32 __user *) arg)) {
 534                 ret = -EFAULT;
 535                 goto out;
 536         }
 537
 538         if (id < 0 || id >= IB_UMAD_MAX_AGENTS || !file->agent[id]) {
 539                 ret = -EINVAL;
 540                 goto out;
 541         }
 542
 543         ib_dereg_mr(file->mr[id]);
 544         ib_unregister_mad_agent(file->agent[id]);
 545         file->agent[id] = NULL;
 546
 547 out:
 548         up_write(&file->agent_mutex);
 549         return ret;
 550 }
 551
 552 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
 553                           unsigned long arg)
 554 {
 555         switch (cmd) {
 556         case IB_USER_MAD_REGISTER_AGENT:
 557                 return ib_umad_reg_agent(filp->private_data, arg);
 558         case IB_USER_MAD_UNREGISTER_AGENT:
 559                 return ib_umad_unreg_agent(filp->private_data, arg);
 560         default:
 561                 return -ENOIOCTLCMD;
 562         }
 563 }
 564
 565 static int ib_umad_open(struct inode *inode, struct file *filp)
 566 {
 567         struct ib_umad_port *port =
 568                 container_of(inode->i_cdev, struct ib_umad_port, dev);
 569         struct ib_umad_file *file;
 570
 571         file = kmalloc(sizeof *file, GFP_KERNEL);
 572         if (!file)
 573                 return -ENOMEM;
 574
 575         memset(file, 0, sizeof *file);
 576
 577         spin_lock_init(&file->recv_lock);
 578         init_rwsem(&file->agent_mutex);
 579         INIT_LIST_HEAD(&file->recv_list);
 580         init_waitqueue_head(&file->recv_wait);
 581
 582         file->port = port;
 583         filp->private_data = file;
 584
 585         return 0;
 586 }
 587
 588 static int ib_umad_close(struct inode *inode, struct file *filp)
 589 {
 590         struct ib_umad_file *file = filp->private_data;
 591         struct ib_umad_packet *packet, *tmp;
 592         int i;
 593
 594         for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
 595                 if (file->agent[i]) {
 596                         ib_dereg_mr(file->mr[i]);
 597                         ib_unregister_mad_agent(file->agent[i]);
 598                 }
 599
 600         list_for_each_entry_safe(packet, tmp, &file->recv_list, list)
 601                 kfree(packet);
 602
 603         kfree(file);
 604
 605         return 0;
 606 }
 607
 608 static struct file_operations umad_fops = {
 609         .owner          = THIS_MODULE,
 610         .read           = ib_umad_read,
 611         .write          = ib_umad_write,
 612         .poll           = ib_umad_poll,
 613         .unlocked_ioctl = ib_umad_ioctl,
 614         .compat_ioctl   = ib_umad_ioctl,
 615         .open           = ib_umad_open,
 616         .release        = ib_umad_close
 617 };
 618
 619 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
 620 {
 621         struct ib_umad_port *port =
 622                 container_of(inode->i_cdev, struct ib_umad_port, sm_dev);
 623         struct ib_port_modify props = {
 624                 .set_port_cap_mask = IB_PORT_SM
 625         };
 626         int ret;
 627
 628         if (filp->f_flags & O_NONBLOCK) {
 629                 if (down_trylock(&port->sm_sem))
 630                         return -EAGAIN;
 631         } else {
 632                 if (down_interruptible(&port->sm_sem))
 633                         return -ERESTARTSYS;
 634         }
 635
 636         ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
 637         if (ret) {
 638                 up(&port->sm_sem);
 639                 return ret;
 640         }
 641
 642         filp->private_data = port;
 643
 644         return 0;
 645 }
 646
 647 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
 648 {
 649         struct ib_umad_port *port = filp->private_data;
 650         struct ib_port_modify props = {
 651                 .clr_port_cap_mask = IB_PORT_SM
 652         };
 653         int ret;
 654
 655         ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
 656         up(&port->sm_sem);
 657
 658         return ret;
 659 }
 660
 661 static struct file_operations umad_sm_fops = {
 662         .owner   = THIS_MODULE,
 663         .open    = ib_umad_sm_open,
 664         .release = ib_umad_sm_close
 665 };
 666
 667 static struct ib_client umad_client = {
 668         .name   = "umad",
 669         .add    = ib_umad_add_one,
 670         .remove = ib_umad_remove_one
 671 };
 672
 673 static ssize_t show_dev(struct class_device *class_dev, char *buf)
 674 {
 675         struct ib_umad_port *port = class_get_devdata(class_dev);
 676
 677         if (class_dev == &port->class_dev)
 678                 return print_dev_t(buf, port->dev.dev);
 679         else
 680                 return print_dev_t(buf, port->sm_dev.dev);
 681 }
 682 static CLASS_DEVICE_ATTR(dev, S_IRUGO, show_dev, NULL);
 683
 684 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
 685 {
 686         struct ib_umad_port *port = class_get_devdata(class_dev);
 687
 688         return sprintf(buf, "%s\n", port->ib_dev->name);
 689 }
 690 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 691
 692 static ssize_t show_port(struct class_device *class_dev, char *buf)
 693 {
 694         struct ib_umad_port *port = class_get_devdata(class_dev);
 695
 696         return sprintf(buf, "%d\n", port->port_num);
 697 }
 698 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
 699
 700 static void ib_umad_release_dev(struct kref *ref)
 701 {
 702         struct ib_umad_device *dev =
 703                 container_of(ref, struct ib_umad_device, ref);
 704
 705         kfree(dev);
 706 }
 707
 708 static void ib_umad_release_port(struct class_device *class_dev)
 709 {
 710         struct ib_umad_port *port = class_get_devdata(class_dev);
 711
 712         if (class_dev == &port->class_dev) {
 713                 cdev_del(&port->dev);
 714                 clear_bit(port->devnum, dev_map);
 715         } else {
 716                 cdev_del(&port->sm_dev);
 717                 clear_bit(port->sm_devnum, dev_map);
 718         }
 719
 720         kref_put(&port->umad_dev->ref, ib_umad_release_dev);
 721 }
 722
 723 static struct class umad_class = {
 724         .name    = "infiniband_mad",
 725         .release = ib_umad_release_port
 726 };
 727
 728 static ssize_t show_abi_version(struct class *class, char *buf)
 729 {
 730         return sprintf(buf, "%d\n", IB_USER_MAD_ABI_VERSION);
 731 }
 732 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
 733
 734 static int ib_umad_init_port(struct ib_device *device, int port_num,
 735                              struct ib_umad_port *port)
 736 {
 737         spin_lock(&map_lock);
 738         port->devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
 739         if (port->devnum >= IB_UMAD_MAX_PORTS) {
 740                 spin_unlock(&map_lock);
 741                 return -1;
 742         }
 743         port->sm_devnum = find_next_zero_bit(dev_map, IB_UMAD_MAX_PORTS * 2, IB_UMAD_MAX_PORTS);
 744         if (port->sm_devnum >= IB_UMAD_MAX_PORTS * 2) {
 745                 spin_unlock(&map_lock);
 746                 return -1;
 747         }
 748         set_bit(port->devnum, dev_map);
 749         set_bit(port->sm_devnum, dev_map);
 750         spin_unlock(&map_lock);
 751
 752         port->ib_dev   = device;
 753         port->port_num = port_num;
 754         init_MUTEX(&port->sm_sem);
 755
 756         cdev_init(&port->dev, &umad_fops);
 757         port->dev.owner = THIS_MODULE;
 758         kobject_set_name(&port->dev.kobj, "umad%d", port->devnum);
 759         if (cdev_add(&port->dev, base_dev + port->devnum, 1))
 760                 return -1;
 761
 762         port->class_dev.class = &umad_class;
 763         port->class_dev.dev   = device->dma_device;
 764
 765         snprintf(port->class_dev.class_id, BUS_ID_SIZE, "umad%d", port->devnum);
 766
 767         if (class_device_register(&port->class_dev))
 768                 goto err_cdev;
 769
 770         class_set_devdata(&port->class_dev, port);
 771         kref_get(&port->umad_dev->ref);
 772
 773         if (class_device_create_file(&port->class_dev, &class_device_attr_dev))
 774                 goto err_class;
 775         if (class_device_create_file(&port->class_dev, &class_device_attr_ibdev))
 776                 goto err_class;
 777         if (class_device_create_file(&port->class_dev, &class_device_attr_port))
 778                 goto err_class;
 779
 780         cdev_init(&port->sm_dev, &umad_sm_fops);
 781         port->sm_dev.owner = THIS_MODULE;
 782         kobject_set_name(&port->dev.kobj, "issm%d", port->sm_devnum - IB_UMAD_MAX_PORTS);
 783         if (cdev_add(&port->sm_dev, base_dev + port->sm_devnum, 1))
 784                 return -1;
 785
 786         port->sm_class_dev.class = &umad_class;
 787         port->sm_class_dev.dev   = device->dma_device;
 788
 789         snprintf(port->sm_class_dev.class_id, BUS_ID_SIZE, "issm%d", port->sm_devnum - IB_UMAD_MAX_PORTS);
 790
 791         if (class_device_register(&port->sm_class_dev))
 792                 goto err_sm_cdev;
 793
 794         class_set_devdata(&port->sm_class_dev, port);
 795         kref_get(&port->umad_dev->ref);
 796
 797         if (class_device_create_file(&port->sm_class_dev, &class_device_attr_dev))
 798                 goto err_sm_class;
 799         if (class_device_create_file(&port->sm_class_dev, &class_device_attr_ibdev))
 800                 goto err_sm_class;
 801         if (class_device_create_file(&port->sm_class_dev, &class_device_attr_port))
 802                 goto err_sm_class;
 803
 804         return 0;
 805
 806 err_sm_class:
 807         class_device_unregister(&port->sm_class_dev);
 808
 809 err_sm_cdev:
 810         cdev_del(&port->sm_dev);
 811
 812 err_class:
 813         class_device_unregister(&port->class_dev);
 814
 815 err_cdev:
 816         cdev_del(&port->dev);
 817         clear_bit(port->devnum, dev_map);
 818
 819         return -1;
 820 }
 821
 822 static void ib_umad_add_one(struct ib_device *device)
 823 {
 824         struct ib_umad_device *umad_dev;
 825         int s, e, i;
 826
 827         if (device->node_type == IB_NODE_SWITCH)
 828                 s = e = 0;
 829         else {
 830                 s = 1;
 831                 e = device->phys_port_cnt;
 832         }
 833
 834         umad_dev = kmalloc(sizeof *umad_dev +
 835                            (e - s + 1) * sizeof (struct ib_umad_port),
 836                            GFP_KERNEL);
 837         if (!umad_dev)
 838                 return;
 839
 840         memset(umad_dev, 0, sizeof *umad_dev +
 841                (e - s + 1) * sizeof (struct ib_umad_port));
 842
 843         kref_init(&umad_dev->ref);
 844
 845         umad_dev->start_port = s;
 846         umad_dev->end_port   = e;
 847
 848         for (i = s; i <= e; ++i) {
 849                 umad_dev->port[i - s].umad_dev = umad_dev;
 850
 851                 if (ib_umad_init_port(device, i, &umad_dev->port[i - s]))
 852                         goto err;
 853         }
 854
 855         ib_set_client_data(device, &umad_client, umad_dev);
 856
 857         return;
 858
 859 err:
 860         while (--i >= s) {
 861                 class_device_unregister(&umad_dev->port[i - s].class_dev);
 862                 class_device_unregister(&umad_dev->port[i - s].sm_class_dev);
 863         }
 864
 865         kref_put(&umad_dev->ref, ib_umad_release_dev);
 866 }
 867
 868 static void ib_umad_remove_one(struct ib_device *device)
 869 {
 870         struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client);
 871         int i;
 872
 873         if (!umad_dev)
 874                 return;
 875
 876         for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i) {
 877                 class_device_unregister(&umad_dev->port[i].class_dev);
 878                 class_device_unregister(&umad_dev->port[i].sm_class_dev);
 879         }
 880
 881         kref_put(&umad_dev->ref, ib_umad_release_dev);
 882 }
 883
 884 static int __init ib_umad_init(void)
 885 {
 886         int ret;
 887
 888         spin_lock_init(&map_lock);
 889
 890         ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
 891                                      "infiniband_mad");
 892         if (ret) {
 893                 printk(KERN_ERR "user_mad: couldn't register device number\n");
 894                 goto out;
 895         }
 896
 897         ret = class_register(&umad_class);
 898         if (ret) {
 899                 printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n");
 900                 goto out_chrdev;
 901         }
 902
 903         ret = class_create_file(&umad_class, &class_attr_abi_version);
 904         if (ret) {
 905                 printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n");
 906                 goto out_class;
 907         }
 908
 909         ret = ib_register_client(&umad_client);
 910         if (ret) {
 911                 printk(KERN_ERR "user_mad: couldn't register ib_umad client\n");
 912                 goto out_class;
 913         }
 914
 915         return 0;
 916
 917 out_class:
 918         class_unregister(&umad_class);
 919
 920 out_chrdev:
 921         unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
 922
 923 out:
 924         return ret;
 925 }
 926
 927 static void __exit ib_umad_cleanup(void)
 928 {
 929         ib_unregister_client(&umad_client);
 930         class_unregister(&umad_class);
 931         unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
 932 }
 933
 934 module_init(ib_umad_init);
 935 module_exit(ib_umad_cleanup);