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