err.no Git - linux-2.6/blob - 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 <rdma/ib_mad.h>
  53 #include <rdma/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_mad_send_buf *msg;
 100         struct list_head   list;
 101         int                length;
 102         DECLARE_PCI_UNMAP_ADDR(mapping)
 103         struct ib_user_mad mad;
 104 };
 105
 106 static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
 107 static spinlock_t map_lock;
 108 static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS * 2);
 109
 110 static void ib_umad_add_one(struct ib_device *device);
 111 static void ib_umad_remove_one(struct ib_device *device);
 112
 113 static int queue_packet(struct ib_umad_file *file,
 114                         struct ib_mad_agent *agent,
 115                         struct ib_umad_packet *packet)
 116 {
 117         int ret = 1;
 118
 119         down_read(&file->agent_mutex);
 120         for (packet->mad.hdr.id = 0;
 121              packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
 122              packet->mad.hdr.id++)
 123                 if (agent == file->agent[packet->mad.hdr.id]) {
 124                         spin_lock_irq(&file->recv_lock);
 125                         list_add_tail(&packet->list, &file->recv_list);
 126                         spin_unlock_irq(&file->recv_lock);
 127                         wake_up_interruptible(&file->recv_wait);
 128                         ret = 0;
 129                         break;
 130                 }
 131
 132         up_read(&file->agent_mutex);
 133
 134         return ret;
 135 }
 136
 137 static void send_handler(struct ib_mad_agent *agent,
 138                          struct ib_mad_send_wc *send_wc)
 139 {
 140         struct ib_umad_file *file = agent->context;
 141         struct ib_umad_packet *timeout;
 142         struct ib_umad_packet *packet = send_wc->send_buf->context[0];
 143
 144         ib_destroy_ah(packet->msg->ah);
 145         ib_free_send_mad(packet->msg);
 146
 147         if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
 148                 timeout = kmalloc(sizeof *timeout + sizeof (struct ib_mad_hdr),
 149                                   GFP_KERNEL);
 150                 if (!timeout)
 151                         goto out;
 152
 153                 memset(timeout, 0, sizeof *timeout + sizeof (struct ib_mad_hdr));
 154
 155                 timeout->length = sizeof (struct ib_mad_hdr);
 156                 timeout->mad.hdr.id = packet->mad.hdr.id;
 157                 timeout->mad.hdr.status = ETIMEDOUT;
 158                 memcpy(timeout->mad.data, packet->mad.data,
 159                        sizeof (struct ib_mad_hdr));
 160
 161                 if (!queue_packet(file, agent, timeout))
 162                                 return;
 163         }
 164 out:
 165         kfree(packet);
 166 }
 167
 168 static void recv_handler(struct ib_mad_agent *agent,
 169                          struct ib_mad_recv_wc *mad_recv_wc)
 170 {
 171         struct ib_umad_file *file = agent->context;
 172         struct ib_umad_packet *packet;
 173         int length;
 174
 175         if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
 176                 goto out;
 177
 178         length = mad_recv_wc->mad_len;
 179         packet = kmalloc(sizeof *packet + length, GFP_KERNEL);
 180         if (!packet)
 181                 goto out;
 182
 183         memset(packet, 0, sizeof *packet + length);
 184         packet->length = length;
 185
 186         ib_coalesce_recv_mad(mad_recv_wc, packet->mad.data);
 187
 188         packet->mad.hdr.status    = 0;
 189         packet->mad.hdr.length    = length + sizeof (struct ib_user_mad);
 190         packet->mad.hdr.qpn       = cpu_to_be32(mad_recv_wc->wc->src_qp);
 191         packet->mad.hdr.lid       = cpu_to_be16(mad_recv_wc->wc->slid);
 192         packet->mad.hdr.sl        = mad_recv_wc->wc->sl;
 193         packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits;
 194         packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
 195         if (packet->mad.hdr.grh_present) {
 196                 /* XXX parse GRH */
 197                 packet->mad.hdr.gid_index       = 0;
 198                 packet->mad.hdr.hop_limit       = 0;
 199                 packet->mad.hdr.traffic_class   = 0;
 200                 memset(packet->mad.hdr.gid, 0, 16);
 201                 packet->mad.hdr.flow_label      = 0;
 202         }
 203
 204         if (queue_packet(file, agent, packet))
 205                 kfree(packet);
 206
 207 out:
 208         ib_free_recv_mad(mad_recv_wc);
 209 }
 210
 211 static ssize_t ib_umad_read(struct file *filp, char __user *buf,
 212                             size_t count, loff_t *pos)
 213 {
 214         struct ib_umad_file *file = filp->private_data;
 215         struct ib_umad_packet *packet;
 216         ssize_t ret;
 217
 218         if (count < sizeof (struct ib_user_mad) + sizeof (struct ib_mad))
 219                 return -EINVAL;
 220
 221         spin_lock_irq(&file->recv_lock);
 222
 223         while (list_empty(&file->recv_list)) {
 224                 spin_unlock_irq(&file->recv_lock);
 225
 226                 if (filp->f_flags & O_NONBLOCK)
 227                         return -EAGAIN;
 228
 229                 if (wait_event_interruptible(file->recv_wait,
 230                                              !list_empty(&file->recv_list)))
 231                         return -ERESTARTSYS;
 232
 233                 spin_lock_irq(&file->recv_lock);
 234         }
 235
 236         packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
 237         list_del(&packet->list);
 238
 239         spin_unlock_irq(&file->recv_lock);
 240
 241         if (count < packet->length + sizeof (struct ib_user_mad)) {
 242                 /* Return length needed (and first RMPP segment) if too small */
 243                 if (copy_to_user(buf, &packet->mad,
 244                                  sizeof (struct ib_user_mad) + sizeof (struct ib_mad)))
 245                         ret = -EFAULT;
 246                 else
 247                         ret = -ENOSPC;
 248         } else if (copy_to_user(buf, &packet->mad,
 249                               packet->length + sizeof (struct ib_user_mad)))
 250                 ret = -EFAULT;
 251         else
 252                 ret = packet->length + sizeof (struct ib_user_mad);
 253         if (ret < 0) {
 254                 /* Requeue packet */
 255                 spin_lock_irq(&file->recv_lock);
 256                 list_add(&packet->list, &file->recv_list);
 257                 spin_unlock_irq(&file->recv_lock);
 258         } else
 259                 kfree(packet);
 260         return ret;
 261 }
 262
 263 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
 264                              size_t count, loff_t *pos)
 265 {
 266         struct ib_umad_file *file = filp->private_data;
 267         struct ib_umad_packet *packet;
 268         struct ib_mad_agent *agent;
 269         struct ib_ah_attr ah_attr;
 270         struct ib_ah *ah;
 271         struct ib_rmpp_mad *rmpp_mad;
 272         u8 method;
 273         __be64 *tid;
 274         int ret, length, hdr_len, rmpp_hdr_size;
 275         int rmpp_active = 0;
 276
 277         if (count < sizeof (struct ib_user_mad))
 278                 return -EINVAL;
 279
 280         length = count - sizeof (struct ib_user_mad);
 281         packet = kmalloc(sizeof *packet + sizeof(struct ib_mad_hdr) +
 282                          sizeof (struct ib_rmpp_hdr), GFP_KERNEL);
 283         if (!packet)
 284                 return -ENOMEM;
 285
 286         if (copy_from_user(&packet->mad, buf,
 287                             sizeof (struct ib_user_mad) +
 288                             sizeof (struct ib_mad_hdr) +
 289                             sizeof (struct ib_rmpp_hdr))) {
 290                 ret = -EFAULT;
 291                 goto err;
 292         }
 293
 294         if (packet->mad.hdr.id < 0 ||
 295             packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
 296                 ret = -EINVAL;
 297                 goto err;
 298         }
 299
 300         packet->length = length;
 301
 302         down_read(&file->agent_mutex);
 303
 304         agent = file->agent[packet->mad.hdr.id];
 305         if (!agent) {
 306                 ret = -EINVAL;
 307                 goto err_up;
 308         }
 309
 310         memset(&ah_attr, 0, sizeof ah_attr);
 311         ah_attr.dlid          = be16_to_cpu(packet->mad.hdr.lid);
 312         ah_attr.sl            = packet->mad.hdr.sl;
 313         ah_attr.src_path_bits = packet->mad.hdr.path_bits;
 314         ah_attr.port_num      = file->port->port_num;
 315         if (packet->mad.hdr.grh_present) {
 316                 ah_attr.ah_flags = IB_AH_GRH;
 317                 memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16);
 318                 ah_attr.grh.flow_label     = be32_to_cpu(packet->mad.hdr.flow_label);
 319                 ah_attr.grh.hop_limit      = packet->mad.hdr.hop_limit;
 320                 ah_attr.grh.traffic_class  = packet->mad.hdr.traffic_class;
 321         }
 322
 323         ah = ib_create_ah(agent->qp->pd, &ah_attr);
 324         if (IS_ERR(ah)) {
 325                 ret = PTR_ERR(ah);
 326                 goto err_up;
 327         }
 328
 329         rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
 330         if (ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE) {
 331                 /* RMPP active */
 332                 if (!agent->rmpp_version) {
 333                         ret = -EINVAL;
 334                         goto err_ah;
 335                 }
 336
 337                 /* Validate that the management class can support RMPP */
 338                 if (rmpp_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_ADM) {
 339                         hdr_len = IB_MGMT_SA_HDR;
 340                 } else if ((rmpp_mad->mad_hdr.mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 341                             (rmpp_mad->mad_hdr.mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)) {
 342                                 hdr_len = IB_MGMT_VENDOR_HDR;
 343                 } else {
 344                         ret = -EINVAL;
 345                         goto err_ah;
 346                 }
 347                 rmpp_active = 1;
 348         } else {
 349                 if (length > sizeof (struct ib_mad)) {
 350                         ret = -EINVAL;
 351                         goto err_ah;
 352                 }
 353                 hdr_len = IB_MGMT_MAD_HDR;
 354         }
 355
 356         packet->msg = ib_create_send_mad(agent,
 357                                          be32_to_cpu(packet->mad.hdr.qpn),
 358                                          0, rmpp_active,
 359                                          hdr_len, length - hdr_len,
 360                                          GFP_KERNEL);
 361         if (IS_ERR(packet->msg)) {
 362                 ret = PTR_ERR(packet->msg);
 363                 goto err_ah;
 364         }
 365
 366         packet->msg->ah         = ah;
 367         packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
 368         packet->msg->retries    = packet->mad.hdr.retries;
 369         packet->msg->context[0] = packet;
 370
 371         if (!rmpp_active) {
 372                 /* Copy message from user into send buffer */
 373                 if (copy_from_user(packet->msg->mad,
 374                                    buf + sizeof (struct ib_user_mad), length)) {
 375                         ret = -EFAULT;
 376                         goto err_msg;
 377                 }
 378         } else {
 379                 rmpp_hdr_size = sizeof (struct ib_mad_hdr) +
 380                                 sizeof (struct ib_rmpp_hdr);
 381
 382                 /* Only copy MAD headers (RMPP header in place) */
 383                 memcpy(packet->msg->mad, packet->mad.data,
 384                        sizeof (struct ib_mad_hdr));
 385
 386                 /* Now, copy rest of message from user into send buffer */
 387                 if (copy_from_user(((struct ib_rmpp_mad *) packet->msg->mad)->data,
 388                                    buf + sizeof (struct ib_user_mad) + rmpp_hdr_size,
 389                                    length - rmpp_hdr_size)) {
 390                         ret = -EFAULT;
 391                         goto err_msg;
 392                 }
 393         }
 394
 395         /*
 396          * If userspace is generating a request that will generate a
 397          * response, we need to make sure the high-order part of the
 398          * transaction ID matches the agent being used to send the
 399          * MAD.
 400          */
 401         method = ((struct ib_mad_hdr *) packet->msg->mad)->method;
 402
 403         if (!(method & IB_MGMT_METHOD_RESP)       &&
 404             method != IB_MGMT_METHOD_TRAP_REPRESS &&
 405             method != IB_MGMT_METHOD_SEND) {
 406                 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
 407                 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
 408                                    (be64_to_cpup(tid) & 0xffffffff));
 409         }
 410
 411         ret = ib_post_send_mad(packet->msg, NULL);
 412         if (ret)
 413                 goto err_msg;
 414
 415         up_read(&file->agent_mutex);
 416
 417         return sizeof (struct ib_user_mad_hdr) + packet->length;
 418
 419 err_msg:
 420         ib_free_send_mad(packet->msg);
 421
 422 err_ah:
 423         ib_destroy_ah(ah);
 424
 425 err_up:
 426         up_read(&file->agent_mutex);
 427
 428 err:
 429         kfree(packet);
 430         return ret;
 431 }
 432
 433 static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
 434 {
 435         struct ib_umad_file *file = filp->private_data;
 436
 437         /* we will always be able to post a MAD send */
 438         unsigned int mask = POLLOUT | POLLWRNORM;
 439
 440         poll_wait(filp, &file->recv_wait, wait);
 441
 442         if (!list_empty(&file->recv_list))
 443                 mask |= POLLIN | POLLRDNORM;
 444
 445         return mask;
 446 }
 447
 448 static int ib_umad_reg_agent(struct ib_umad_file *file, unsigned long arg)
 449 {
 450         struct ib_user_mad_reg_req ureq;
 451         struct ib_mad_reg_req req;
 452         struct ib_mad_agent *agent;
 453         int agent_id;
 454         int ret;
 455
 456         down_write(&file->agent_mutex);
 457
 458         if (copy_from_user(&ureq, (void __user *) arg, sizeof ureq)) {
 459                 ret = -EFAULT;
 460                 goto out;
 461         }
 462
 463         if (ureq.qpn != 0 && ureq.qpn != 1) {
 464                 ret = -EINVAL;
 465                 goto out;
 466         }
 467
 468         for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
 469                 if (!file->agent[agent_id])
 470                         goto found;
 471
 472         ret = -ENOMEM;
 473         goto out;
 474
 475 found:
 476         if (ureq.mgmt_class) {
 477                 req.mgmt_class         = ureq.mgmt_class;
 478                 req.mgmt_class_version = ureq.mgmt_class_version;
 479                 memcpy(req.method_mask, ureq.method_mask, sizeof req.method_mask);
 480                 memcpy(req.oui,         ureq.oui,         sizeof req.oui);
 481         }
 482
 483         agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
 484                                       ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
 485                                       ureq.mgmt_class ? &req : NULL,
 486                                       ureq.rmpp_version,
 487                                       send_handler, recv_handler, file);
 488         if (IS_ERR(agent)) {
 489                 ret = PTR_ERR(agent);
 490                 goto out;
 491         }
 492
 493         file->agent[agent_id] = agent;
 494
 495         file->mr[agent_id] = ib_get_dma_mr(agent->qp->pd, IB_ACCESS_LOCAL_WRITE);
 496         if (IS_ERR(file->mr[agent_id])) {
 497                 ret = -ENOMEM;
 498                 goto err;
 499         }
 500
 501         if (put_user(agent_id,
 502                      (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
 503                 ret = -EFAULT;
 504                 goto err_mr;
 505         }
 506
 507         ret = 0;
 508         goto out;
 509
 510 err_mr:
 511         ib_dereg_mr(file->mr[agent_id]);
 512
 513 err:
 514         file->agent[agent_id] = NULL;
 515         ib_unregister_mad_agent(agent);
 516
 517 out:
 518         up_write(&file->agent_mutex);
 519         return ret;
 520 }
 521
 522 static int ib_umad_unreg_agent(struct ib_umad_file *file, unsigned long arg)
 523 {
 524         u32 id;
 525         int ret = 0;
 526
 527         down_write(&file->agent_mutex);
 528
 529         if (get_user(id, (u32 __user *) arg)) {
 530                 ret = -EFAULT;
 531                 goto out;
 532         }
 533
 534         if (id < 0 || id >= IB_UMAD_MAX_AGENTS || !file->agent[id]) {
 535                 ret = -EINVAL;
 536                 goto out;
 537         }
 538
 539         ib_dereg_mr(file->mr[id]);
 540         ib_unregister_mad_agent(file->agent[id]);
 541         file->agent[id] = NULL;
 542
 543 out:
 544         up_write(&file->agent_mutex);
 545         return ret;
 546 }
 547
 548 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
 549                           unsigned long arg)
 550 {
 551         switch (cmd) {
 552         case IB_USER_MAD_REGISTER_AGENT:
 553                 return ib_umad_reg_agent(filp->private_data, arg);
 554         case IB_USER_MAD_UNREGISTER_AGENT:
 555                 return ib_umad_unreg_agent(filp->private_data, arg);
 556         default:
 557                 return -ENOIOCTLCMD;
 558         }
 559 }
 560
 561 static int ib_umad_open(struct inode *inode, struct file *filp)
 562 {
 563         struct ib_umad_port *port =
 564                 container_of(inode->i_cdev, struct ib_umad_port, dev);
 565         struct ib_umad_file *file;
 566
 567         file = kmalloc(sizeof *file, GFP_KERNEL);
 568         if (!file)
 569                 return -ENOMEM;
 570
 571         memset(file, 0, sizeof *file);
 572
 573         spin_lock_init(&file->recv_lock);
 574         init_rwsem(&file->agent_mutex);
 575         INIT_LIST_HEAD(&file->recv_list);
 576         init_waitqueue_head(&file->recv_wait);
 577
 578         file->port = port;
 579         filp->private_data = file;
 580
 581         return 0;
 582 }
 583
 584 static int ib_umad_close(struct inode *inode, struct file *filp)
 585 {
 586         struct ib_umad_file *file = filp->private_data;
 587         struct ib_umad_packet *packet, *tmp;
 588         int i;
 589
 590         for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
 591                 if (file->agent[i]) {
 592                         ib_dereg_mr(file->mr[i]);
 593                         ib_unregister_mad_agent(file->agent[i]);
 594                 }
 595
 596         list_for_each_entry_safe(packet, tmp, &file->recv_list, list)
 597                 kfree(packet);
 598
 599         kfree(file);
 600
 601         return 0;
 602 }
 603
 604 static struct file_operations umad_fops = {
 605         .owner          = THIS_MODULE,
 606         .read           = ib_umad_read,
 607         .write          = ib_umad_write,
 608         .poll           = ib_umad_poll,
 609         .unlocked_ioctl = ib_umad_ioctl,
 610         .compat_ioctl   = ib_umad_ioctl,
 611         .open           = ib_umad_open,
 612         .release        = ib_umad_close
 613 };
 614
 615 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
 616 {
 617         struct ib_umad_port *port =
 618                 container_of(inode->i_cdev, struct ib_umad_port, sm_dev);
 619         struct ib_port_modify props = {
 620                 .set_port_cap_mask = IB_PORT_SM
 621         };
 622         int ret;
 623
 624         if (filp->f_flags & O_NONBLOCK) {
 625                 if (down_trylock(&port->sm_sem))
 626                         return -EAGAIN;
 627         } else {
 628                 if (down_interruptible(&port->sm_sem))
 629                         return -ERESTARTSYS;
 630         }
 631
 632         ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
 633         if (ret) {
 634                 up(&port->sm_sem);
 635                 return ret;
 636         }
 637
 638         filp->private_data = port;
 639
 640         return 0;
 641 }
 642
 643 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
 644 {
 645         struct ib_umad_port *port = filp->private_data;
 646         struct ib_port_modify props = {
 647                 .clr_port_cap_mask = IB_PORT_SM
 648         };
 649         int ret;
 650
 651         ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
 652         up(&port->sm_sem);
 653
 654         return ret;
 655 }
 656
 657 static struct file_operations umad_sm_fops = {
 658         .owner   = THIS_MODULE,
 659         .open    = ib_umad_sm_open,
 660         .release = ib_umad_sm_close
 661 };
 662
 663 static struct ib_client umad_client = {
 664         .name   = "umad",
 665         .add    = ib_umad_add_one,
 666         .remove = ib_umad_remove_one
 667 };
 668
 669 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
 670 {
 671         struct ib_umad_port *port = class_get_devdata(class_dev);
 672
 673         return sprintf(buf, "%s\n", port->ib_dev->name);
 674 }
 675 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 676
 677 static ssize_t show_port(struct class_device *class_dev, char *buf)
 678 {
 679         struct ib_umad_port *port = class_get_devdata(class_dev);
 680
 681         return sprintf(buf, "%d\n", port->port_num);
 682 }
 683 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
 684
 685 static void ib_umad_release_dev(struct kref *ref)
 686 {
 687         struct ib_umad_device *dev =
 688                 container_of(ref, struct ib_umad_device, ref);
 689
 690         kfree(dev);
 691 }
 692
 693 static void ib_umad_release_port(struct class_device *class_dev)
 694 {
 695         struct ib_umad_port *port = class_get_devdata(class_dev);
 696
 697         if (class_dev == &port->class_dev) {
 698                 cdev_del(&port->dev);
 699                 clear_bit(port->devnum, dev_map);
 700         } else {
 701                 cdev_del(&port->sm_dev);
 702                 clear_bit(port->sm_devnum, dev_map);
 703         }
 704
 705         kref_put(&port->umad_dev->ref, ib_umad_release_dev);
 706 }
 707
 708 static struct class umad_class = {
 709         .name    = "infiniband_mad",
 710         .release = ib_umad_release_port
 711 };
 712
 713 static ssize_t show_abi_version(struct class *class, char *buf)
 714 {
 715         return sprintf(buf, "%d\n", IB_USER_MAD_ABI_VERSION);
 716 }
 717 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
 718
 719 static int ib_umad_init_port(struct ib_device *device, int port_num,
 720                              struct ib_umad_port *port)
 721 {
 722         spin_lock(&map_lock);
 723         port->devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
 724         if (port->devnum >= IB_UMAD_MAX_PORTS) {
 725                 spin_unlock(&map_lock);
 726                 return -1;
 727         }
 728         port->sm_devnum = find_next_zero_bit(dev_map, IB_UMAD_MAX_PORTS * 2, IB_UMAD_MAX_PORTS);
 729         if (port->sm_devnum >= IB_UMAD_MAX_PORTS * 2) {
 730                 spin_unlock(&map_lock);
 731                 return -1;
 732         }
 733         set_bit(port->devnum, dev_map);
 734         set_bit(port->sm_devnum, dev_map);
 735         spin_unlock(&map_lock);
 736
 737         port->ib_dev   = device;
 738         port->port_num = port_num;
 739         init_MUTEX(&port->sm_sem);
 740
 741         cdev_init(&port->dev, &umad_fops);
 742         port->dev.owner = THIS_MODULE;
 743         kobject_set_name(&port->dev.kobj, "umad%d", port->devnum);
 744         if (cdev_add(&port->dev, base_dev + port->devnum, 1))
 745                 return -1;
 746
 747         port->class_dev.class = &umad_class;
 748         port->class_dev.dev   = device->dma_device;
 749         port->class_dev.devt  = port->dev.dev;
 750
 751         snprintf(port->class_dev.class_id, BUS_ID_SIZE, "umad%d", port->devnum);
 752
 753         if (class_device_register(&port->class_dev))
 754                 goto err_cdev;
 755
 756         class_set_devdata(&port->class_dev, port);
 757         kref_get(&port->umad_dev->ref);
 758
 759         if (class_device_create_file(&port->class_dev, &class_device_attr_ibdev))
 760                 goto err_class;
 761         if (class_device_create_file(&port->class_dev, &class_device_attr_port))
 762                 goto err_class;
 763
 764         cdev_init(&port->sm_dev, &umad_sm_fops);
 765         port->sm_dev.owner = THIS_MODULE;
 766         kobject_set_name(&port->dev.kobj, "issm%d", port->sm_devnum - IB_UMAD_MAX_PORTS);
 767         if (cdev_add(&port->sm_dev, base_dev + port->sm_devnum, 1))
 768                 return -1;
 769
 770         port->sm_class_dev.class = &umad_class;
 771         port->sm_class_dev.dev   = device->dma_device;
 772         port->sm_class_dev.devt  = port->sm_dev.dev;
 773
 774         snprintf(port->sm_class_dev.class_id, BUS_ID_SIZE, "issm%d", port->sm_devnum - IB_UMAD_MAX_PORTS);
 775
 776         if (class_device_register(&port->sm_class_dev))
 777                 goto err_sm_cdev;
 778
 779         class_set_devdata(&port->sm_class_dev, port);
 780         kref_get(&port->umad_dev->ref);
 781
 782         if (class_device_create_file(&port->sm_class_dev, &class_device_attr_ibdev))
 783                 goto err_sm_class;
 784         if (class_device_create_file(&port->sm_class_dev, &class_device_attr_port))
 785                 goto err_sm_class;
 786
 787         return 0;
 788
 789 err_sm_class:
 790         class_device_unregister(&port->sm_class_dev);
 791
 792 err_sm_cdev:
 793         cdev_del(&port->sm_dev);
 794
 795 err_class:
 796         class_device_unregister(&port->class_dev);
 797
 798 err_cdev:
 799         cdev_del(&port->dev);
 800         clear_bit(port->devnum, dev_map);
 801
 802         return -1;
 803 }
 804
 805 static void ib_umad_add_one(struct ib_device *device)
 806 {
 807         struct ib_umad_device *umad_dev;
 808         int s, e, i;
 809
 810         if (device->node_type == IB_NODE_SWITCH)
 811                 s = e = 0;
 812         else {
 813                 s = 1;
 814                 e = device->phys_port_cnt;
 815         }
 816
 817         umad_dev = kmalloc(sizeof *umad_dev +
 818                            (e - s + 1) * sizeof (struct ib_umad_port),
 819                            GFP_KERNEL);
 820         if (!umad_dev)
 821                 return;
 822
 823         memset(umad_dev, 0, sizeof *umad_dev +
 824                (e - s + 1) * sizeof (struct ib_umad_port));
 825
 826         kref_init(&umad_dev->ref);
 827
 828         umad_dev->start_port = s;
 829         umad_dev->end_port   = e;
 830
 831         for (i = s; i <= e; ++i) {
 832                 umad_dev->port[i - s].umad_dev = umad_dev;
 833
 834                 if (ib_umad_init_port(device, i, &umad_dev->port[i - s]))
 835                         goto err;
 836         }
 837
 838         ib_set_client_data(device, &umad_client, umad_dev);
 839
 840         return;
 841
 842 err:
 843         while (--i >= s) {
 844                 class_device_unregister(&umad_dev->port[i - s].class_dev);
 845                 class_device_unregister(&umad_dev->port[i - s].sm_class_dev);
 846         }
 847
 848         kref_put(&umad_dev->ref, ib_umad_release_dev);
 849 }
 850
 851 static void ib_umad_remove_one(struct ib_device *device)
 852 {
 853         struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client);
 854         int i;
 855
 856         if (!umad_dev)
 857                 return;
 858
 859         for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i) {
 860                 class_device_unregister(&umad_dev->port[i].class_dev);
 861                 class_device_unregister(&umad_dev->port[i].sm_class_dev);
 862         }
 863
 864         kref_put(&umad_dev->ref, ib_umad_release_dev);
 865 }
 866
 867 static int __init ib_umad_init(void)
 868 {
 869         int ret;
 870
 871         spin_lock_init(&map_lock);
 872
 873         ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
 874                                      "infiniband_mad");
 875         if (ret) {
 876                 printk(KERN_ERR "user_mad: couldn't register device number\n");
 877                 goto out;
 878         }
 879
 880         ret = class_register(&umad_class);
 881         if (ret) {
 882                 printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n");
 883                 goto out_chrdev;
 884         }
 885
 886         ret = class_create_file(&umad_class, &class_attr_abi_version);
 887         if (ret) {
 888                 printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n");
 889                 goto out_class;
 890         }
 891
 892         ret = ib_register_client(&umad_client);
 893         if (ret) {
 894                 printk(KERN_ERR "user_mad: couldn't register ib_umad client\n");
 895                 goto out_class;
 896         }
 897
 898         return 0;
 899
 900 out_class:
 901         class_unregister(&umad_class);
 902
 903 out_chrdev:
 904         unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
 905
 906 out:
 907         return ret;
 908 }
 909
 910 static void __exit ib_umad_cleanup(void)
 911 {
 912         ib_unregister_client(&umad_client);
 913         class_unregister(&umad_class);
 914         unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
 915 }
 916
 917 module_init(ib_umad_init);
 918 module_exit(ib_umad_cleanup);