user_mad.c revision 2f76e82947b977a1008cfd2868351a701c93c69c
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 55MODULE_AUTHOR("Roland Dreier"); 56MODULE_DESCRIPTION("InfiniBand userspace MAD packet access"); 57MODULE_LICENSE("Dual BSD/GPL"); 58 59enum { 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/* 68 * Our lifetime rules for these structs are the following: each time a 69 * device special file is opened, we look up the corresponding struct 70 * ib_umad_port by minor in the umad_port[] table while holding the 71 * port_lock. If this lookup succeeds, we take a reference on the 72 * ib_umad_port's struct ib_umad_device while still holding the 73 * port_lock; if the lookup fails, we fail the open(). We drop these 74 * references in the corresponding close(). 75 * 76 * In addition to references coming from open character devices, there 77 * is one more reference to each ib_umad_device representing the 78 * module's reference taken when allocating the ib_umad_device in 79 * ib_umad_add_one(). 80 * 81 * When destroying an ib_umad_device, we clear all of its 82 * ib_umad_ports from umad_port[] while holding port_lock before 83 * dropping the module's reference to the ib_umad_device. This is 84 * always safe because any open() calls will either succeed and obtain 85 * a reference before we clear the umad_port[] entries, or fail after 86 * we clear the umad_port[] entries. 87 */ 88 89struct ib_umad_port { 90 struct cdev *dev; 91 struct class_device *class_dev; 92 93 struct cdev *sm_dev; 94 struct class_device *sm_class_dev; 95 struct semaphore sm_sem; 96 97 struct rw_semaphore mutex; 98 struct list_head file_list; 99 100 struct ib_device *ib_dev; 101 struct ib_umad_device *umad_dev; 102 int dev_num; 103 u8 port_num; 104}; 105 106struct ib_umad_device { 107 int start_port, end_port; 108 struct kref ref; 109 struct ib_umad_port port[0]; 110}; 111 112struct ib_umad_file { 113 struct ib_umad_port *port; 114 struct list_head recv_list; 115 struct list_head port_list; 116 spinlock_t recv_lock; 117 wait_queue_head_t recv_wait; 118 struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS]; 119 struct ib_mr *mr[IB_UMAD_MAX_AGENTS]; 120}; 121 122struct ib_umad_packet { 123 struct ib_mad_send_buf *msg; 124 struct list_head list; 125 int length; 126 struct ib_user_mad mad; 127}; 128 129static struct class *umad_class; 130 131static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE); 132 133static DEFINE_SPINLOCK(port_lock); 134static struct ib_umad_port *umad_port[IB_UMAD_MAX_PORTS]; 135static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS * 2); 136 137static void ib_umad_add_one(struct ib_device *device); 138static void ib_umad_remove_one(struct ib_device *device); 139 140static void ib_umad_release_dev(struct kref *ref) 141{ 142 struct ib_umad_device *dev = 143 container_of(ref, struct ib_umad_device, ref); 144 145 kfree(dev); 146} 147 148static int queue_packet(struct ib_umad_file *file, 149 struct ib_mad_agent *agent, 150 struct ib_umad_packet *packet) 151{ 152 int ret = 1; 153 154 down_read(&file->port->mutex); 155 for (packet->mad.hdr.id = 0; 156 packet->mad.hdr.id < IB_UMAD_MAX_AGENTS; 157 packet->mad.hdr.id++) 158 if (agent == file->agent[packet->mad.hdr.id]) { 159 spin_lock_irq(&file->recv_lock); 160 list_add_tail(&packet->list, &file->recv_list); 161 spin_unlock_irq(&file->recv_lock); 162 wake_up_interruptible(&file->recv_wait); 163 ret = 0; 164 break; 165 } 166 167 up_read(&file->port->mutex); 168 169 return ret; 170} 171 172static void send_handler(struct ib_mad_agent *agent, 173 struct ib_mad_send_wc *send_wc) 174{ 175 struct ib_umad_file *file = agent->context; 176 struct ib_umad_packet *timeout; 177 struct ib_umad_packet *packet = send_wc->send_buf->context[0]; 178 179 ib_destroy_ah(packet->msg->ah); 180 ib_free_send_mad(packet->msg); 181 182 if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) { 183 timeout = kzalloc(sizeof *timeout + IB_MGMT_MAD_HDR, GFP_KERNEL); 184 if (!timeout) 185 goto out; 186 187 timeout->length = IB_MGMT_MAD_HDR; 188 timeout->mad.hdr.id = packet->mad.hdr.id; 189 timeout->mad.hdr.status = ETIMEDOUT; 190 memcpy(timeout->mad.data, packet->mad.data, 191 sizeof (struct ib_mad_hdr)); 192 193 if (!queue_packet(file, agent, timeout)) 194 return; 195 } 196out: 197 kfree(packet); 198} 199 200static void recv_handler(struct ib_mad_agent *agent, 201 struct ib_mad_recv_wc *mad_recv_wc) 202{ 203 struct ib_umad_file *file = agent->context; 204 struct ib_umad_packet *packet; 205 int length; 206 207 if (mad_recv_wc->wc->status != IB_WC_SUCCESS) 208 goto out; 209 210 length = mad_recv_wc->mad_len; 211 packet = kzalloc(sizeof *packet + length, GFP_KERNEL); 212 if (!packet) 213 goto out; 214 215 packet->length = length; 216 217 ib_coalesce_recv_mad(mad_recv_wc, packet->mad.data); 218 219 packet->mad.hdr.status = 0; 220 packet->mad.hdr.length = length + sizeof (struct ib_user_mad); 221 packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp); 222 packet->mad.hdr.lid = cpu_to_be16(mad_recv_wc->wc->slid); 223 packet->mad.hdr.sl = mad_recv_wc->wc->sl; 224 packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits; 225 packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH); 226 if (packet->mad.hdr.grh_present) { 227 /* XXX parse GRH */ 228 packet->mad.hdr.gid_index = 0; 229 packet->mad.hdr.hop_limit = 0; 230 packet->mad.hdr.traffic_class = 0; 231 memset(packet->mad.hdr.gid, 0, 16); 232 packet->mad.hdr.flow_label = 0; 233 } 234 235 if (queue_packet(file, agent, packet)) 236 kfree(packet); 237 238out: 239 ib_free_recv_mad(mad_recv_wc); 240} 241 242static ssize_t ib_umad_read(struct file *filp, char __user *buf, 243 size_t count, loff_t *pos) 244{ 245 struct ib_umad_file *file = filp->private_data; 246 struct ib_umad_packet *packet; 247 ssize_t ret; 248 249 if (count < sizeof (struct ib_user_mad) + sizeof (struct ib_mad)) 250 return -EINVAL; 251 252 spin_lock_irq(&file->recv_lock); 253 254 while (list_empty(&file->recv_list)) { 255 spin_unlock_irq(&file->recv_lock); 256 257 if (filp->f_flags & O_NONBLOCK) 258 return -EAGAIN; 259 260 if (wait_event_interruptible(file->recv_wait, 261 !list_empty(&file->recv_list))) 262 return -ERESTARTSYS; 263 264 spin_lock_irq(&file->recv_lock); 265 } 266 267 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list); 268 list_del(&packet->list); 269 270 spin_unlock_irq(&file->recv_lock); 271 272 if (count < packet->length + sizeof (struct ib_user_mad)) { 273 /* Return length needed (and first RMPP segment) if too small */ 274 if (copy_to_user(buf, &packet->mad, 275 sizeof (struct ib_user_mad) + sizeof (struct ib_mad))) 276 ret = -EFAULT; 277 else 278 ret = -ENOSPC; 279 } else if (copy_to_user(buf, &packet->mad, 280 packet->length + sizeof (struct ib_user_mad))) 281 ret = -EFAULT; 282 else 283 ret = packet->length + sizeof (struct ib_user_mad); 284 if (ret < 0) { 285 /* Requeue packet */ 286 spin_lock_irq(&file->recv_lock); 287 list_add(&packet->list, &file->recv_list); 288 spin_unlock_irq(&file->recv_lock); 289 } else 290 kfree(packet); 291 return ret; 292} 293 294static ssize_t ib_umad_write(struct file *filp, const char __user *buf, 295 size_t count, loff_t *pos) 296{ 297 struct ib_umad_file *file = filp->private_data; 298 struct ib_umad_packet *packet; 299 struct ib_mad_agent *agent; 300 struct ib_ah_attr ah_attr; 301 struct ib_ah *ah; 302 struct ib_rmpp_mad *rmpp_mad; 303 u8 method; 304 __be64 *tid; 305 int ret, length, hdr_len, copy_offset; 306 int rmpp_active = 0; 307 308 if (count < sizeof (struct ib_user_mad)) 309 return -EINVAL; 310 311 length = count - sizeof (struct ib_user_mad); 312 packet = kmalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL); 313 if (!packet) 314 return -ENOMEM; 315 316 if (copy_from_user(&packet->mad, buf, 317 sizeof (struct ib_user_mad) + IB_MGMT_RMPP_HDR)) { 318 ret = -EFAULT; 319 goto err; 320 } 321 322 if (packet->mad.hdr.id < 0 || 323 packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) { 324 ret = -EINVAL; 325 goto err; 326 } 327 328 down_read(&file->port->mutex); 329 330 agent = file->agent[packet->mad.hdr.id]; 331 if (!agent) { 332 ret = -EINVAL; 333 goto err_up; 334 } 335 336 memset(&ah_attr, 0, sizeof ah_attr); 337 ah_attr.dlid = be16_to_cpu(packet->mad.hdr.lid); 338 ah_attr.sl = packet->mad.hdr.sl; 339 ah_attr.src_path_bits = packet->mad.hdr.path_bits; 340 ah_attr.port_num = file->port->port_num; 341 if (packet->mad.hdr.grh_present) { 342 ah_attr.ah_flags = IB_AH_GRH; 343 memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16); 344 ah_attr.grh.flow_label = be32_to_cpu(packet->mad.hdr.flow_label); 345 ah_attr.grh.hop_limit = packet->mad.hdr.hop_limit; 346 ah_attr.grh.traffic_class = packet->mad.hdr.traffic_class; 347 } 348 349 ah = ib_create_ah(agent->qp->pd, &ah_attr); 350 if (IS_ERR(ah)) { 351 ret = PTR_ERR(ah); 352 goto err_up; 353 } 354 355 rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data; 356 if (ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE) { 357 /* RMPP active */ 358 if (!agent->rmpp_version) { 359 ret = -EINVAL; 360 goto err_ah; 361 } 362 363 /* Validate that the management class can support RMPP */ 364 if (rmpp_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_ADM) { 365 hdr_len = IB_MGMT_SA_HDR; 366 } else if ((rmpp_mad->mad_hdr.mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) && 367 (rmpp_mad->mad_hdr.mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)) { 368 hdr_len = IB_MGMT_VENDOR_HDR; 369 } else { 370 ret = -EINVAL; 371 goto err_ah; 372 } 373 rmpp_active = 1; 374 copy_offset = IB_MGMT_RMPP_HDR; 375 } else { 376 hdr_len = IB_MGMT_MAD_HDR; 377 copy_offset = IB_MGMT_MAD_HDR; 378 } 379 380 packet->msg = ib_create_send_mad(agent, 381 be32_to_cpu(packet->mad.hdr.qpn), 382 0, rmpp_active, 383 hdr_len, length - hdr_len, 384 GFP_KERNEL); 385 if (IS_ERR(packet->msg)) { 386 ret = PTR_ERR(packet->msg); 387 goto err_ah; 388 } 389 390 packet->msg->ah = ah; 391 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms; 392 packet->msg->retries = packet->mad.hdr.retries; 393 packet->msg->context[0] = packet; 394 395 /* Copy MAD headers (RMPP header in place) */ 396 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR); 397 /* Now, copy rest of message from user into send buffer */ 398 if (copy_from_user(packet->msg->mad + copy_offset, 399 buf + sizeof (struct ib_user_mad) + copy_offset, 400 length - copy_offset)) { 401 ret = -EFAULT; 402 goto err_msg; 403 } 404 405 /* 406 * If userspace is generating a request that will generate a 407 * response, we need to make sure the high-order part of the 408 * transaction ID matches the agent being used to send the 409 * MAD. 410 */ 411 method = ((struct ib_mad_hdr *) packet->msg->mad)->method; 412 413 if (!(method & IB_MGMT_METHOD_RESP) && 414 method != IB_MGMT_METHOD_TRAP_REPRESS && 415 method != IB_MGMT_METHOD_SEND) { 416 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid; 417 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 | 418 (be64_to_cpup(tid) & 0xffffffff)); 419 } 420 421 ret = ib_post_send_mad(packet->msg, NULL); 422 if (ret) 423 goto err_msg; 424 425 up_read(&file->port->mutex); 426 427 return count; 428 429err_msg: 430 ib_free_send_mad(packet->msg); 431 432err_ah: 433 ib_destroy_ah(ah); 434 435err_up: 436 up_read(&file->port->mutex); 437 438err: 439 kfree(packet); 440 return ret; 441} 442 443static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait) 444{ 445 struct ib_umad_file *file = filp->private_data; 446 447 /* we will always be able to post a MAD send */ 448 unsigned int mask = POLLOUT | POLLWRNORM; 449 450 poll_wait(filp, &file->recv_wait, wait); 451 452 if (!list_empty(&file->recv_list)) 453 mask |= POLLIN | POLLRDNORM; 454 455 return mask; 456} 457 458static int ib_umad_reg_agent(struct ib_umad_file *file, unsigned long arg) 459{ 460 struct ib_user_mad_reg_req ureq; 461 struct ib_mad_reg_req req; 462 struct ib_mad_agent *agent; 463 int agent_id; 464 int ret; 465 466 down_write(&file->port->mutex); 467 468 if (!file->port->ib_dev) { 469 ret = -EPIPE; 470 goto out; 471 } 472 473 if (copy_from_user(&ureq, (void __user *) arg, sizeof ureq)) { 474 ret = -EFAULT; 475 goto out; 476 } 477 478 if (ureq.qpn != 0 && ureq.qpn != 1) { 479 ret = -EINVAL; 480 goto out; 481 } 482 483 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id) 484 if (!file->agent[agent_id]) 485 goto found; 486 487 ret = -ENOMEM; 488 goto out; 489 490found: 491 if (ureq.mgmt_class) { 492 req.mgmt_class = ureq.mgmt_class; 493 req.mgmt_class_version = ureq.mgmt_class_version; 494 memcpy(req.method_mask, ureq.method_mask, sizeof req.method_mask); 495 memcpy(req.oui, ureq.oui, sizeof req.oui); 496 } 497 498 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num, 499 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI, 500 ureq.mgmt_class ? &req : NULL, 501 ureq.rmpp_version, 502 send_handler, recv_handler, file); 503 if (IS_ERR(agent)) { 504 ret = PTR_ERR(agent); 505 goto out; 506 } 507 508 file->mr[agent_id] = ib_get_dma_mr(agent->qp->pd, IB_ACCESS_LOCAL_WRITE); 509 if (IS_ERR(file->mr[agent_id])) { 510 ret = -ENOMEM; 511 goto err; 512 } 513 514 if (put_user(agent_id, 515 (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) { 516 ret = -EFAULT; 517 goto err_mr; 518 } 519 520 file->agent[agent_id] = agent; 521 ret = 0; 522 523 goto out; 524 525err_mr: 526 ib_dereg_mr(file->mr[agent_id]); 527 528err: 529 ib_unregister_mad_agent(agent); 530 531out: 532 up_write(&file->port->mutex); 533 return ret; 534} 535 536static int ib_umad_unreg_agent(struct ib_umad_file *file, unsigned long arg) 537{ 538 struct ib_mad_agent *agent = NULL; 539 struct ib_mr *mr = NULL; 540 u32 id; 541 int ret = 0; 542 543 if (get_user(id, (u32 __user *) arg)) 544 return -EFAULT; 545 546 down_write(&file->port->mutex); 547 548 if (id < 0 || id >= IB_UMAD_MAX_AGENTS || !file->agent[id]) { 549 ret = -EINVAL; 550 goto out; 551 } 552 553 agent = file->agent[id]; 554 mr = file->mr[id]; 555 file->agent[id] = NULL; 556 557out: 558 up_write(&file->port->mutex); 559 560 if (agent) { 561 ib_unregister_mad_agent(agent); 562 ib_dereg_mr(mr); 563 } 564 565 return ret; 566} 567 568static long ib_umad_ioctl(struct file *filp, unsigned int cmd, 569 unsigned long arg) 570{ 571 switch (cmd) { 572 case IB_USER_MAD_REGISTER_AGENT: 573 return ib_umad_reg_agent(filp->private_data, arg); 574 case IB_USER_MAD_UNREGISTER_AGENT: 575 return ib_umad_unreg_agent(filp->private_data, arg); 576 default: 577 return -ENOIOCTLCMD; 578 } 579} 580 581static int ib_umad_open(struct inode *inode, struct file *filp) 582{ 583 struct ib_umad_port *port; 584 struct ib_umad_file *file; 585 int ret = 0; 586 587 spin_lock(&port_lock); 588 port = umad_port[iminor(inode) - IB_UMAD_MINOR_BASE]; 589 if (port) 590 kref_get(&port->umad_dev->ref); 591 spin_unlock(&port_lock); 592 593 if (!port) 594 return -ENXIO; 595 596 down_write(&port->mutex); 597 598 if (!port->ib_dev) { 599 ret = -ENXIO; 600 goto out; 601 } 602 603 file = kzalloc(sizeof *file, GFP_KERNEL); 604 if (!file) { 605 kref_put(&port->umad_dev->ref, ib_umad_release_dev); 606 ret = -ENOMEM; 607 goto out; 608 } 609 610 spin_lock_init(&file->recv_lock); 611 INIT_LIST_HEAD(&file->recv_list); 612 init_waitqueue_head(&file->recv_wait); 613 614 file->port = port; 615 filp->private_data = file; 616 617 list_add_tail(&file->port_list, &port->file_list); 618 619out: 620 up_write(&port->mutex); 621 return ret; 622} 623 624static int ib_umad_close(struct inode *inode, struct file *filp) 625{ 626 struct ib_umad_file *file = filp->private_data; 627 struct ib_umad_device *dev = file->port->umad_dev; 628 struct ib_umad_packet *packet, *tmp; 629 int i; 630 631 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i) 632 if (file->agent[i]) { 633 ib_unregister_mad_agent(file->agent[i]); 634 ib_dereg_mr(file->mr[i]); 635 } 636 637 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) 638 kfree(packet); 639 640 down_write(&file->port->mutex); 641 list_del(&file->port_list); 642 up_write(&file->port->mutex); 643 644 kfree(file); 645 646 kref_put(&dev->ref, ib_umad_release_dev); 647 648 return 0; 649} 650 651static struct file_operations umad_fops = { 652 .owner = THIS_MODULE, 653 .read = ib_umad_read, 654 .write = ib_umad_write, 655 .poll = ib_umad_poll, 656 .unlocked_ioctl = ib_umad_ioctl, 657 .compat_ioctl = ib_umad_ioctl, 658 .open = ib_umad_open, 659 .release = ib_umad_close 660}; 661 662static int ib_umad_sm_open(struct inode *inode, struct file *filp) 663{ 664 struct ib_umad_port *port; 665 struct ib_port_modify props = { 666 .set_port_cap_mask = IB_PORT_SM 667 }; 668 int ret; 669 670 spin_lock(&port_lock); 671 port = umad_port[iminor(inode) - IB_UMAD_MINOR_BASE - IB_UMAD_MAX_PORTS]; 672 if (port) 673 kref_get(&port->umad_dev->ref); 674 spin_unlock(&port_lock); 675 676 if (!port) 677 return -ENXIO; 678 679 if (filp->f_flags & O_NONBLOCK) { 680 if (down_trylock(&port->sm_sem)) { 681 ret = -EAGAIN; 682 goto fail; 683 } 684 } else { 685 if (down_interruptible(&port->sm_sem)) { 686 ret = -ERESTARTSYS; 687 goto fail; 688 } 689 } 690 691 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props); 692 if (ret) { 693 up(&port->sm_sem); 694 goto fail; 695 } 696 697 filp->private_data = port; 698 699 return 0; 700 701fail: 702 kref_put(&port->umad_dev->ref, ib_umad_release_dev); 703 return ret; 704} 705 706static int ib_umad_sm_close(struct inode *inode, struct file *filp) 707{ 708 struct ib_umad_port *port = filp->private_data; 709 struct ib_port_modify props = { 710 .clr_port_cap_mask = IB_PORT_SM 711 }; 712 int ret = 0; 713 714 down_write(&port->mutex); 715 if (port->ib_dev) 716 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props); 717 up_write(&port->mutex); 718 719 up(&port->sm_sem); 720 721 kref_put(&port->umad_dev->ref, ib_umad_release_dev); 722 723 return ret; 724} 725 726static struct file_operations umad_sm_fops = { 727 .owner = THIS_MODULE, 728 .open = ib_umad_sm_open, 729 .release = ib_umad_sm_close 730}; 731 732static struct ib_client umad_client = { 733 .name = "umad", 734 .add = ib_umad_add_one, 735 .remove = ib_umad_remove_one 736}; 737 738static ssize_t show_ibdev(struct class_device *class_dev, char *buf) 739{ 740 struct ib_umad_port *port = class_get_devdata(class_dev); 741 742 if (!port) 743 return -ENODEV; 744 745 return sprintf(buf, "%s\n", port->ib_dev->name); 746} 747static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 748 749static ssize_t show_port(struct class_device *class_dev, char *buf) 750{ 751 struct ib_umad_port *port = class_get_devdata(class_dev); 752 753 if (!port) 754 return -ENODEV; 755 756 return sprintf(buf, "%d\n", port->port_num); 757} 758static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL); 759 760static ssize_t show_abi_version(struct class *class, char *buf) 761{ 762 return sprintf(buf, "%d\n", IB_USER_MAD_ABI_VERSION); 763} 764static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL); 765 766static int ib_umad_init_port(struct ib_device *device, int port_num, 767 struct ib_umad_port *port) 768{ 769 spin_lock(&port_lock); 770 port->dev_num = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS); 771 if (port->dev_num >= IB_UMAD_MAX_PORTS) { 772 spin_unlock(&port_lock); 773 return -1; 774 } 775 set_bit(port->dev_num, dev_map); 776 spin_unlock(&port_lock); 777 778 port->ib_dev = device; 779 port->port_num = port_num; 780 init_MUTEX(&port->sm_sem); 781 init_rwsem(&port->mutex); 782 INIT_LIST_HEAD(&port->file_list); 783 784 port->dev = cdev_alloc(); 785 if (!port->dev) 786 return -1; 787 port->dev->owner = THIS_MODULE; 788 port->dev->ops = &umad_fops; 789 kobject_set_name(&port->dev->kobj, "umad%d", port->dev_num); 790 if (cdev_add(port->dev, base_dev + port->dev_num, 1)) 791 goto err_cdev; 792 793 port->class_dev = class_device_create(umad_class, NULL, port->dev->dev, 794 device->dma_device, 795 "umad%d", port->dev_num); 796 if (IS_ERR(port->class_dev)) 797 goto err_cdev; 798 799 if (class_device_create_file(port->class_dev, &class_device_attr_ibdev)) 800 goto err_class; 801 if (class_device_create_file(port->class_dev, &class_device_attr_port)) 802 goto err_class; 803 804 port->sm_dev = cdev_alloc(); 805 if (!port->sm_dev) 806 goto err_class; 807 port->sm_dev->owner = THIS_MODULE; 808 port->sm_dev->ops = &umad_sm_fops; 809 kobject_set_name(&port->sm_dev->kobj, "issm%d", port->dev_num); 810 if (cdev_add(port->sm_dev, base_dev + port->dev_num + IB_UMAD_MAX_PORTS, 1)) 811 goto err_sm_cdev; 812 813 port->sm_class_dev = class_device_create(umad_class, NULL, port->sm_dev->dev, 814 device->dma_device, 815 "issm%d", port->dev_num); 816 if (IS_ERR(port->sm_class_dev)) 817 goto err_sm_cdev; 818 819 class_set_devdata(port->class_dev, port); 820 class_set_devdata(port->sm_class_dev, port); 821 822 if (class_device_create_file(port->sm_class_dev, &class_device_attr_ibdev)) 823 goto err_sm_class; 824 if (class_device_create_file(port->sm_class_dev, &class_device_attr_port)) 825 goto err_sm_class; 826 827 spin_lock(&port_lock); 828 umad_port[port->dev_num] = port; 829 spin_unlock(&port_lock); 830 831 return 0; 832 833err_sm_class: 834 class_device_destroy(umad_class, port->sm_dev->dev); 835 836err_sm_cdev: 837 cdev_del(port->sm_dev); 838 839err_class: 840 class_device_destroy(umad_class, port->dev->dev); 841 842err_cdev: 843 cdev_del(port->dev); 844 clear_bit(port->dev_num, dev_map); 845 846 return -1; 847} 848 849static void ib_umad_kill_port(struct ib_umad_port *port) 850{ 851 struct ib_umad_file *file; 852 int id; 853 854 class_set_devdata(port->class_dev, NULL); 855 class_set_devdata(port->sm_class_dev, NULL); 856 857 class_device_destroy(umad_class, port->dev->dev); 858 class_device_destroy(umad_class, port->sm_dev->dev); 859 860 cdev_del(port->dev); 861 cdev_del(port->sm_dev); 862 863 spin_lock(&port_lock); 864 umad_port[port->dev_num] = NULL; 865 spin_unlock(&port_lock); 866 867 down_write(&port->mutex); 868 869 port->ib_dev = NULL; 870 871 list_for_each_entry(file, &port->file_list, port_list) 872 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id) { 873 if (!file->agent[id]) 874 continue; 875 ib_dereg_mr(file->mr[id]); 876 ib_unregister_mad_agent(file->agent[id]); 877 file->agent[id] = NULL; 878 } 879 880 up_write(&port->mutex); 881 882 clear_bit(port->dev_num, dev_map); 883} 884 885static void ib_umad_add_one(struct ib_device *device) 886{ 887 struct ib_umad_device *umad_dev; 888 int s, e, i; 889 890 if (device->node_type == IB_NODE_SWITCH) 891 s = e = 0; 892 else { 893 s = 1; 894 e = device->phys_port_cnt; 895 } 896 897 umad_dev = kzalloc(sizeof *umad_dev + 898 (e - s + 1) * sizeof (struct ib_umad_port), 899 GFP_KERNEL); 900 if (!umad_dev) 901 return; 902 903 kref_init(&umad_dev->ref); 904 905 umad_dev->start_port = s; 906 umad_dev->end_port = e; 907 908 for (i = s; i <= e; ++i) { 909 umad_dev->port[i - s].umad_dev = umad_dev; 910 911 if (ib_umad_init_port(device, i, &umad_dev->port[i - s])) 912 goto err; 913 } 914 915 ib_set_client_data(device, &umad_client, umad_dev); 916 917 return; 918 919err: 920 while (--i >= s) 921 ib_umad_kill_port(&umad_dev->port[i - s]); 922 923 kref_put(&umad_dev->ref, ib_umad_release_dev); 924} 925 926static void ib_umad_remove_one(struct ib_device *device) 927{ 928 struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client); 929 int i; 930 931 if (!umad_dev) 932 return; 933 934 for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i) 935 ib_umad_kill_port(&umad_dev->port[i]); 936 937 kref_put(&umad_dev->ref, ib_umad_release_dev); 938} 939 940static int __init ib_umad_init(void) 941{ 942 int ret; 943 944 ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2, 945 "infiniband_mad"); 946 if (ret) { 947 printk(KERN_ERR "user_mad: couldn't register device number\n"); 948 goto out; 949 } 950 951 umad_class = class_create(THIS_MODULE, "infiniband_mad"); 952 if (IS_ERR(umad_class)) { 953 ret = PTR_ERR(umad_class); 954 printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n"); 955 goto out_chrdev; 956 } 957 958 ret = class_create_file(umad_class, &class_attr_abi_version); 959 if (ret) { 960 printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n"); 961 goto out_class; 962 } 963 964 ret = ib_register_client(&umad_client); 965 if (ret) { 966 printk(KERN_ERR "user_mad: couldn't register ib_umad client\n"); 967 goto out_class; 968 } 969 970 return 0; 971 972out_class: 973 class_destroy(umad_class); 974 975out_chrdev: 976 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2); 977 978out: 979 return ret; 980} 981 982static void __exit ib_umad_cleanup(void) 983{ 984 ib_unregister_client(&umad_client); 985 class_destroy(umad_class); 986 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2); 987} 988 989module_init(ib_umad_init); 990module_exit(ib_umad_cleanup); 991