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[IB] ib_umad: various cleanups
[deliverable/linux.git] / drivers / infiniband / core / user_mad.c
CommitLineData
1da177e4
LT		 1/*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
2a1d9b7f 3 * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
cb183a06 4 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
1da177e4
LT		 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 *
cb183a06 34 * $Id: user_mad.c 2814 2005-07-06 19:14:09Z halr $
1da177e4
LT		 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
a4d61e84
RD		 52#include <rdma/ib_mad.h>
53#include <rdma/ib_user_mad.h>
1da177e4
LT		 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
67struct 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
82struct ib_umad_device {
83 int start_port, end_port;
84 struct kref ref;
85 struct ib_umad_port port[0];
86};
87
88struct 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
98struct ib_umad_packet {
cb183a06 99 struct ib_mad_send_buf *msg;
1da177e4 100 struct list_head list;
cb183a06 101 int length;
cb183a06 102 struct ib_user_mad mad;
1da177e4
LT		 103};
104
105static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
106static spinlock_t map_lock;
107static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS * 2);
108
109static void ib_umad_add_one(struct ib_device *device);
110static void ib_umad_remove_one(struct ib_device *device);
111
112static 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);
cb183a06
HR		 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]) {
1da177e4
LT		 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
136static 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;
34816ad9
SH		 140 struct ib_umad_packet *timeout;
141 struct ib_umad_packet *packet = send_wc->send_buf->context[0];
1da177e4 142
34816ad9 143 ib_destroy_ah(packet->msg->ah);
cb183a06 144 ib_free_send_mad(packet->msg);
1da177e4
LT		 145
146 if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
cb0f0910 147 timeout = kzalloc(sizeof *timeout + IB_MGMT_MAD_HDR, GFP_KERNEL);
cb183a06
HR		 148 if (!timeout)
149 goto out;
1da177e4 150
cb0f0910
SH		 151 timeout->length = IB_MGMT_MAD_HDR;
152 timeout->mad.hdr.id = packet->mad.hdr.id;
cb183a06
HR		 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 }
160out:
1da177e4
LT		 161 kfree(packet);
162}
163
164static 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;
cb183a06 169 int length;
1da177e4
LT		 170
171 if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
172 goto out;
173
cb183a06 174 length = mad_recv_wc->mad_len;
cb0f0910 175 packet = kzalloc(sizeof *packet + length, GFP_KERNEL);
1da177e4
LT		 176 if (!packet)
177 goto out;
178
cb183a06
HR		 179 packet->length = length;
180
181 ib_coalesce_recv_mad(mad_recv_wc, packet->mad.data);
1da177e4 182
cb183a06
HR		 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) {
1da177e4 191 /* XXX parse GRH */
cb183a06
HR		 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;
1da177e4
LT		 197 }
198
199 if (queue_packet(file, agent, packet))
200 kfree(packet);
201
202out:
203 ib_free_recv_mad(mad_recv_wc);
204}
205
206static 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
cb183a06 213 if (count < sizeof (struct ib_user_mad) + sizeof (struct ib_mad))
1da177e4
LT		 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
cb183a06
HR		 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,
cb0f0910 244 packet->length + sizeof (struct ib_user_mad)))
1da177e4
LT		 245 ret = -EFAULT;
246 else
cb183a06
HR		 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);
1da177e4
LT		 255 return ret;
256}
257
258static 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;
34816ad9 265 struct ib_ah *ah;
cb183a06 266 struct ib_rmpp_mad *rmpp_mad;
1da177e4 267 u8 method;
97f52eb4 268 __be64 *tid;
cb0f0910 269 int ret, length, hdr_len, copy_offset;
cb183a06 270 int rmpp_active = 0;
1da177e4
LT		 271
272 if (count < sizeof (struct ib_user_mad))
273 return -EINVAL;
274
cb183a06 275 length = count - sizeof (struct ib_user_mad);
cb0f0910 276 packet = kmalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
1da177e4
LT		 277 if (!packet)
278 return -ENOMEM;
279
cb183a06 280 if (copy_from_user(&packet->mad, buf,
cb0f0910 281 sizeof (struct ib_user_mad) + IB_MGMT_RMPP_HDR)) {
cb183a06
HR		 282 ret = -EFAULT;
283 goto err;
1da177e4
LT		 284 }
285
cb183a06
HR		 286 if (packet->mad.hdr.id < 0 ||
287 packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
1da177e4
LT		 288 ret = -EINVAL;
289 goto err;
290 }
291
292 down_read(&file->agent_mutex);
293
cb183a06 294 agent = file->agent[packet->mad.hdr.id];
1da177e4
LT		 295 if (!agent) {
296 ret = -EINVAL;
297 goto err_up;
298 }
299
1da177e4 300 memset(&ah_attr, 0, sizeof ah_attr);
cb183a06
HR		 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;
1da177e4 304 ah_attr.port_num = file->port->port_num;
cb183a06 305 if (packet->mad.hdr.grh_present) {
1da177e4 306 ah_attr.ah_flags = IB_AH_GRH;
cb183a06 307 memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16);
97f52eb4 308 ah_attr.grh.flow_label = be32_to_cpu(packet->mad.hdr.flow_label);
cb183a06
HR		 309 ah_attr.grh.hop_limit = packet->mad.hdr.hop_limit;
310 ah_attr.grh.traffic_class = packet->mad.hdr.traffic_class;
1da177e4
LT		 311 }
312
34816ad9
SH		 313 ah = ib_create_ah(agent->qp->pd, &ah_attr);
314 if (IS_ERR(ah)) {
315 ret = PTR_ERR(ah);
1da177e4
LT		 316 goto err_up;
317 }
318
cb183a06
HR		 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 }
eff4c654
HR		 326
327 /* Validate that the management class can support RMPP */
cb183a06 328 if (rmpp_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_ADM) {
34816ad9 329 hdr_len = IB_MGMT_SA_HDR;
cb183a06
HR		 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)) {
34816ad9 332 hdr_len = IB_MGMT_VENDOR_HDR;
cb183a06
HR		 333 } else {
334 ret = -EINVAL;
335 goto err_ah;
336 }
337 rmpp_active = 1;
cb0f0910 338 copy_offset = IB_MGMT_RMPP_HDR;
cb183a06 339 } else {
34816ad9 340 hdr_len = IB_MGMT_MAD_HDR;
cb0f0910 341 copy_offset = IB_MGMT_MAD_HDR;
cb183a06
HR		 342 }
343
344 packet->msg = ib_create_send_mad(agent,
345 be32_to_cpu(packet->mad.hdr.qpn),
34816ad9
SH		 346 0, rmpp_active,
347 hdr_len, length - hdr_len,
cb183a06
HR		 348 GFP_KERNEL);
349 if (IS_ERR(packet->msg)) {
350 ret = PTR_ERR(packet->msg);
351 goto err_ah;
352 }
1da177e4 353
34816ad9
SH		 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;
1da177e4 358
cb0f0910
SH		 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;
cb183a06
HR		 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 */
089a1bed 375 method = ((struct ib_mad_hdr *) packet->msg->mad)->method;
cb183a06
HR		 376
377 if (!(method & IB_MGMT_METHOD_RESP) &&
378 method != IB_MGMT_METHOD_TRAP_REPRESS &&
379 method != IB_MGMT_METHOD_SEND) {
089a1bed 380 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
cb183a06
HR		 381 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
382 (be64_to_cpup(tid) & 0xffffffff));
1da177e4
LT		 383 }
384
34816ad9 385 ret = ib_post_send_mad(packet->msg, NULL);
cb183a06
HR		 386 if (ret)
387 goto err_msg;
388
1da177e4
LT		 389 up_read(&file->agent_mutex);
390
cb0f0910 391 return count;
cb183a06
HR		 392
393err_msg:
394 ib_free_send_mad(packet->msg);
395
396err_ah:
34816ad9 397 ib_destroy_ah(ah);
1da177e4
LT		 398
399err_up:
400 up_read(&file->agent_mutex);
401
402err:
403 kfree(packet);
404 return ret;
405}
406
407static 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
422static 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
449found:
0df3bb13
RD		 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 }
1da177e4
LT		 456
457 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
458 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
0df3bb13 459 ureq.mgmt_class ? &req : NULL,
cb183a06
HR		 460 ureq.rmpp_version,
461 send_handler, recv_handler, file);
1da177e4
LT		 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
484err_mr:
485 ib_dereg_mr(file->mr[agent_id]);
486
487err:
488 file->agent[agent_id] = NULL;
489 ib_unregister_mad_agent(agent);
490
491out:
492 up_write(&file->agent_mutex);
493 return ret;
494}
495
496static 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
517out:
518 up_write(&file->agent_mutex);
519 return ret;
520}
521
cb183a06
HR		 522static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
523 unsigned long arg)
1da177e4
LT		 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
535static 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
cb0f0910 541 file = kzalloc(sizeof *file, GFP_KERNEL);
1da177e4
LT		 542 if (!file)
543 return -ENOMEM;
544
1da177e4
LT		 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
556static int ib_umad_close(struct inode *inode, struct file *filp)
557{
558 struct ib_umad_file *file = filp->private_data;
561e148e 559 struct ib_umad_packet *packet, *tmp;
1da177e4
LT		 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
561e148e
RD		 568 list_for_each_entry_safe(packet, tmp, &file->recv_list, list)
569 kfree(packet);
570
1da177e4
LT		 571 kfree(file);
572
573 return 0;
574}
575
576static struct file_operations umad_fops = {
cb183a06
HR		 577 .owner = THIS_MODULE,
578 .read = ib_umad_read,
579 .write = ib_umad_write,
580 .poll = ib_umad_poll,
1da177e4 581 .unlocked_ioctl = ib_umad_ioctl,
cb183a06
HR		 582 .compat_ioctl = ib_umad_ioctl,
583 .open = ib_umad_open,
584 .release = ib_umad_close
1da177e4
LT		 585};
586
587static 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
615static 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
629static struct file_operations umad_sm_fops = {
630 .owner = THIS_MODULE,
631 .open = ib_umad_sm_open,
632 .release = ib_umad_sm_close
633};
634
635static struct ib_client umad_client = {
636 .name = "umad",
637 .add = ib_umad_add_one,
638 .remove = ib_umad_remove_one
639};
640
1da177e4
LT		 641static 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}
647static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
648
649static 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}
655static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
656
657static 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
665static 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
680static struct class umad_class = {
681 .name = "infiniband_mad",
682 .release = ib_umad_release_port
683};
684
685static ssize_t show_abi_version(struct class *class, char *buf)
686{
687 return sprintf(buf, "%d\n", IB_USER_MAD_ABI_VERSION);
688}
689static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
690
691static 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;
bbf20786 721 port->class_dev.devt = port->dev.dev;
1da177e4
LT		 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
1da177e4
LT		 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;
bbf20786 744 port->sm_class_dev.devt = port->sm_dev.dev;
1da177e4
LT		 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
1da177e4
LT		 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
761err_sm_class:
762 class_device_unregister(&port->sm_class_dev);
763
764err_sm_cdev:
765 cdev_del(&port->sm_dev);
766
767err_class:
768 class_device_unregister(&port->class_dev);
769
770err_cdev:
771 cdev_del(&port->dev);
772 clear_bit(port->devnum, dev_map);
773
774 return -1;
775}
776
777static 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
cb0f0910 789 umad_dev = kzalloc(sizeof *umad_dev +
1da177e4
LT		 790 (e - s + 1) * sizeof (struct ib_umad_port),
791 GFP_KERNEL);
792 if (!umad_dev)
793 return;
794
1da177e4
LT		 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
811err:
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
820static 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
836static 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
869out_class:
870 class_unregister(&umad_class);
871
872out_chrdev:
873 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
874
875out:
876 return ret;
877}
878
879static 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
886module_init(ib_umad_init);
887module_exit(ib_umad_cleanup);
Linux kernel - Deliverables
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