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Merge branch 'fix/pcm-hwptr' into for-linus
[linux/fpc-iii.git] / drivers / infiniband / core / user_mad.c
blob8c46f2257098cf2d7e01ba472c31a48dc5ffb77a
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 * Copyright (c) 2008 Cisco. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 */
35
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/device.h>
39 #include <linux/err.h>
40 #include <linux/fs.h>
41 #include <linux/cdev.h>
42 #include <linux/dma-mapping.h>
43 #include <linux/poll.h>
44 #include <linux/mutex.h>
45 #include <linux/kref.h>
46 #include <linux/compat.h>
47 #include <linux/semaphore.h>
48
49 #include <asm/uaccess.h>
50
51 #include <rdma/ib_mad.h>
52 #include <rdma/ib_user_mad.h>
53
54 MODULE_AUTHOR("Roland Dreier");
55 MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");
56 MODULE_LICENSE("Dual BSD/GPL");
57
58 enum {
59 IB_UMAD_MAX_PORTS = 64,
60 IB_UMAD_MAX_AGENTS = 32,
61
62 IB_UMAD_MAJOR = 231,
63 IB_UMAD_MINOR_BASE = 0
64 };
65
66 /*
67 * Our lifetime rules for these structs are the following: each time a
68 * device special file is opened, we look up the corresponding struct
69 * ib_umad_port by minor in the umad_port[] table while holding the
70 * port_lock. If this lookup succeeds, we take a reference on the
71 * ib_umad_port's struct ib_umad_device while still holding the
72 * port_lock; if the lookup fails, we fail the open(). We drop these
73 * references in the corresponding close().
74 *
75 * In addition to references coming from open character devices, there
76 * is one more reference to each ib_umad_device representing the
77 * module's reference taken when allocating the ib_umad_device in
78 * ib_umad_add_one().
79 *
80 * When destroying an ib_umad_device, we clear all of its
81 * ib_umad_ports from umad_port[] while holding port_lock before
82 * dropping the module's reference to the ib_umad_device. This is
83 * always safe because any open() calls will either succeed and obtain
84 * a reference before we clear the umad_port[] entries, or fail after
85 * we clear the umad_port[] entries.
86 */
87
88 struct ib_umad_port {
89 struct cdev *cdev;
90 struct device *dev;
91
92 struct cdev *sm_cdev;
93 struct device *sm_dev;
94 struct semaphore sm_sem;
95
96 struct mutex file_mutex;
97 struct list_head file_list;
98
99 struct ib_device *ib_dev;
100 struct ib_umad_device *umad_dev;
101 int dev_num;
102 u8 port_num;
103 };
104
105 struct ib_umad_device {
106 int start_port, end_port;
107 struct kref ref;
108 struct ib_umad_port port[0];
109 };
110
111 struct ib_umad_file {
112 struct mutex mutex;
113 struct ib_umad_port *port;
114 struct list_head recv_list;
115 struct list_head send_list;
116 struct list_head port_list;
117 spinlock_t send_lock;
118 wait_queue_head_t recv_wait;
119 struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS];
120 int agents_dead;
121 u8 use_pkey_index;
122 u8 already_used;
123 };
124
125 struct ib_umad_packet {
126 struct ib_mad_send_buf *msg;
127 struct ib_mad_recv_wc *recv_wc;
128 struct list_head list;
129 int length;
130 struct ib_user_mad mad;
131 };
132
133 static struct class *umad_class;
134
135 static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
136
137 static DEFINE_SPINLOCK(port_lock);
138 static struct ib_umad_port *umad_port[IB_UMAD_MAX_PORTS];
139 static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS);
140
141 static void ib_umad_add_one(struct ib_device *device);
142 static void ib_umad_remove_one(struct ib_device *device);
143
144 static void ib_umad_release_dev(struct kref *ref)
145 {
146 struct ib_umad_device *dev =
147 container_of(ref, struct ib_umad_device, ref);
148
149 kfree(dev);
150 }
151
152 static int hdr_size(struct ib_umad_file *file)
153 {
154 return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) :
155 sizeof (struct ib_user_mad_hdr_old);
156 }
157
158 /* caller must hold file->mutex */
159 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
160 {
161 return file->agents_dead ? NULL : file->agent[id];
162 }
163
164 static int queue_packet(struct ib_umad_file *file,
165 struct ib_mad_agent *agent,
166 struct ib_umad_packet *packet)
167 {
168 int ret = 1;
169
170 mutex_lock(&file->mutex);
171
172 for (packet->mad.hdr.id = 0;
173 packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
174 packet->mad.hdr.id++)
175 if (agent == __get_agent(file, packet->mad.hdr.id)) {
176 list_add_tail(&packet->list, &file->recv_list);
177 wake_up_interruptible(&file->recv_wait);
178 ret = 0;
179 break;
180 }
181
182 mutex_unlock(&file->mutex);
183
184 return ret;
185 }
186
187 static void dequeue_send(struct ib_umad_file *file,
188 struct ib_umad_packet *packet)
189 {
190 spin_lock_irq(&file->send_lock);
191 list_del(&packet->list);
192 spin_unlock_irq(&file->send_lock);
193 }
194
195 static void send_handler(struct ib_mad_agent *agent,
196 struct ib_mad_send_wc *send_wc)
197 {
198 struct ib_umad_file *file = agent->context;
199 struct ib_umad_packet *packet = send_wc->send_buf->context[0];
200
201 dequeue_send(file, packet);
202 ib_destroy_ah(packet->msg->ah);
203 ib_free_send_mad(packet->msg);
204
205 if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
206 packet->length = IB_MGMT_MAD_HDR;
207 packet->mad.hdr.status = ETIMEDOUT;
208 if (!queue_packet(file, agent, packet))
209 return;
210 }
211 kfree(packet);
212 }
213
214 static void recv_handler(struct ib_mad_agent *agent,
215 struct ib_mad_recv_wc *mad_recv_wc)
216 {
217 struct ib_umad_file *file = agent->context;
218 struct ib_umad_packet *packet;
219
220 if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
221 goto err1;
222
223 packet = kzalloc(sizeof *packet, GFP_KERNEL);
224 if (!packet)
225 goto err1;
226
227 packet->length = mad_recv_wc->mad_len;
228 packet->recv_wc = mad_recv_wc;
229
230 packet->mad.hdr.status = 0;
231 packet->mad.hdr.length = hdr_size(file) + mad_recv_wc->mad_len;
232 packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp);
233 packet->mad.hdr.lid = cpu_to_be16(mad_recv_wc->wc->slid);
234 packet->mad.hdr.sl = mad_recv_wc->wc->sl;
235 packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits;
236 packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;
237 packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
238 if (packet->mad.hdr.grh_present) {
239 struct ib_ah_attr ah_attr;
240
241 ib_init_ah_from_wc(agent->device, agent->port_num,
242 mad_recv_wc->wc, mad_recv_wc->recv_buf.grh,
243 &ah_attr);
244
245 packet->mad.hdr.gid_index = ah_attr.grh.sgid_index;
246 packet->mad.hdr.hop_limit = ah_attr.grh.hop_limit;
247 packet->mad.hdr.traffic_class = ah_attr.grh.traffic_class;
248 memcpy(packet->mad.hdr.gid, &ah_attr.grh.dgid, 16);
249 packet->mad.hdr.flow_label = cpu_to_be32(ah_attr.grh.flow_label);
250 }
251
252 if (queue_packet(file, agent, packet))
253 goto err2;
254 return;
255
256 err2:
257 kfree(packet);
258 err1:
259 ib_free_recv_mad(mad_recv_wc);
260 }
261
262 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
263 struct ib_umad_packet *packet, size_t count)
264 {
265 struct ib_mad_recv_buf *recv_buf;
266 int left, seg_payload, offset, max_seg_payload;
267
268 /* We need enough room to copy the first (or only) MAD segment. */
269 recv_buf = &packet->recv_wc->recv_buf;
270 if ((packet->length <= sizeof (*recv_buf->mad) &&
271 count < hdr_size(file) + packet->length) ||
272 (packet->length > sizeof (*recv_buf->mad) &&
273 count < hdr_size(file) + sizeof (*recv_buf->mad)))
274 return -EINVAL;
275
276 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
277 return -EFAULT;
278
279 buf += hdr_size(file);
280 seg_payload = min_t(int, packet->length, sizeof (*recv_buf->mad));
281 if (copy_to_user(buf, recv_buf->mad, seg_payload))
282 return -EFAULT;
283
284 if (seg_payload < packet->length) {
285 /*
286 * Multipacket RMPP MAD message. Copy remainder of message.
287 * Note that last segment may have a shorter payload.
288 */
289 if (count < hdr_size(file) + packet->length) {
290 /*
291 * The buffer is too small, return the first RMPP segment,
292 * which includes the RMPP message length.
293 */
294 return -ENOSPC;
295 }
296 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
297 max_seg_payload = sizeof (struct ib_mad) - offset;
298
299 for (left = packet->length - seg_payload, buf += seg_payload;
300 left; left -= seg_payload, buf += seg_payload) {
301 recv_buf = container_of(recv_buf->list.next,
302 struct ib_mad_recv_buf, list);
303 seg_payload = min(left, max_seg_payload);
304 if (copy_to_user(buf, ((void *) recv_buf->mad) + offset,
305 seg_payload))
306 return -EFAULT;
307 }
308 }
309 return hdr_size(file) + packet->length;
310 }
311
312 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
313 struct ib_umad_packet *packet, size_t count)
314 {
315 ssize_t size = hdr_size(file) + packet->length;
316
317 if (count < size)
318 return -EINVAL;
319
320 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
321 return -EFAULT;
322
323 buf += hdr_size(file);
324
325 if (copy_to_user(buf, packet->mad.data, packet->length))
326 return -EFAULT;
327
328 return size;
329 }
330
331 static ssize_t ib_umad_read(struct file *filp, char __user *buf,
332 size_t count, loff_t *pos)
333 {
334 struct ib_umad_file *file = filp->private_data;
335 struct ib_umad_packet *packet;
336 ssize_t ret;
337
338 if (count < hdr_size(file))
339 return -EINVAL;
340
341 mutex_lock(&file->mutex);
342
343 while (list_empty(&file->recv_list)) {
344 mutex_unlock(&file->mutex);
345
346 if (filp->f_flags & O_NONBLOCK)
347 return -EAGAIN;
348
349 if (wait_event_interruptible(file->recv_wait,
350 !list_empty(&file->recv_list)))
351 return -ERESTARTSYS;
352
353 mutex_lock(&file->mutex);
354 }
355
356 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
357 list_del(&packet->list);
358
359 mutex_unlock(&file->mutex);
360
361 if (packet->recv_wc)
362 ret = copy_recv_mad(file, buf, packet, count);
363 else
364 ret = copy_send_mad(file, buf, packet, count);
365
366 if (ret < 0) {
367 /* Requeue packet */
368 mutex_lock(&file->mutex);
369 list_add(&packet->list, &file->recv_list);
370 mutex_unlock(&file->mutex);
371 } else {
372 if (packet->recv_wc)
373 ib_free_recv_mad(packet->recv_wc);
374 kfree(packet);
375 }
376 return ret;
377 }
378
379 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
380 {
381 int left, seg;
382
383 /* Copy class specific header */
384 if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
385 copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
386 msg->hdr_len - IB_MGMT_RMPP_HDR))
387 return -EFAULT;
388
389 /* All headers are in place. Copy data segments. */
390 for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
391 seg++, left -= msg->seg_size, buf += msg->seg_size) {
392 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
393 min(left, msg->seg_size)))
394 return -EFAULT;
395 }
396 return 0;
397 }
398
399 static int same_destination(struct ib_user_mad_hdr *hdr1,
400 struct ib_user_mad_hdr *hdr2)
401 {
402 if (!hdr1->grh_present && !hdr2->grh_present)
403 return (hdr1->lid == hdr2->lid);
404
405 if (hdr1->grh_present && hdr2->grh_present)
406 return !memcmp(hdr1->gid, hdr2->gid, 16);
407
408 return 0;
409 }
410
411 static int is_duplicate(struct ib_umad_file *file,
412 struct ib_umad_packet *packet)
413 {
414 struct ib_umad_packet *sent_packet;
415 struct ib_mad_hdr *sent_hdr, *hdr;
416
417 hdr = (struct ib_mad_hdr *) packet->mad.data;
418 list_for_each_entry(sent_packet, &file->send_list, list) {
419 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
420
421 if ((hdr->tid != sent_hdr->tid) ||
422 (hdr->mgmt_class != sent_hdr->mgmt_class))
423 continue;
424
425 /*
426 * No need to be overly clever here. If two new operations have
427 * the same TID, reject the second as a duplicate. This is more
428 * restrictive than required by the spec.
429 */
430 if (!ib_response_mad((struct ib_mad *) hdr)) {
431 if (!ib_response_mad((struct ib_mad *) sent_hdr))
432 return 1;
433 continue;
434 } else if (!ib_response_mad((struct ib_mad *) sent_hdr))
435 continue;
436
437 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
438 return 1;
439 }
440
441 return 0;
442 }
443
444 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
445 size_t count, loff_t *pos)
446 {
447 struct ib_umad_file *file = filp->private_data;
448 struct ib_umad_packet *packet;
449 struct ib_mad_agent *agent;
450 struct ib_ah_attr ah_attr;
451 struct ib_ah *ah;
452 struct ib_rmpp_mad *rmpp_mad;
453 __be64 *tid;
454 int ret, data_len, hdr_len, copy_offset, rmpp_active;
455
456 if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
457 return -EINVAL;
458
459 packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
460 if (!packet)
461 return -ENOMEM;
462
463 if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
464 ret = -EFAULT;
465 goto err;
466 }
467
468 if (packet->mad.hdr.id < 0 ||
469 packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
470 ret = -EINVAL;
471 goto err;
472 }
473
474 buf += hdr_size(file);
475
476 if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
477 ret = -EFAULT;
478 goto err;
479 }
480
481 mutex_lock(&file->mutex);
482
483 agent = __get_agent(file, packet->mad.hdr.id);
484 if (!agent) {
485 ret = -EINVAL;
486 goto err_up;
487 }
488
489 memset(&ah_attr, 0, sizeof ah_attr);
490 ah_attr.dlid = be16_to_cpu(packet->mad.hdr.lid);
491 ah_attr.sl = packet->mad.hdr.sl;
492 ah_attr.src_path_bits = packet->mad.hdr.path_bits;
493 ah_attr.port_num = file->port->port_num;
494 if (packet->mad.hdr.grh_present) {
495 ah_attr.ah_flags = IB_AH_GRH;
496 memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16);
497 ah_attr.grh.sgid_index = packet->mad.hdr.gid_index;
498 ah_attr.grh.flow_label = be32_to_cpu(packet->mad.hdr.flow_label);
499 ah_attr.grh.hop_limit = packet->mad.hdr.hop_limit;
500 ah_attr.grh.traffic_class = packet->mad.hdr.traffic_class;
501 }
502
503 ah = ib_create_ah(agent->qp->pd, &ah_attr);
504 if (IS_ERR(ah)) {
505 ret = PTR_ERR(ah);
506 goto err_up;
507 }
508
509 rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
510 hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
511 if (!ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)) {
512 copy_offset = IB_MGMT_MAD_HDR;
513 rmpp_active = 0;
514 } else {
515 copy_offset = IB_MGMT_RMPP_HDR;
516 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
517 IB_MGMT_RMPP_FLAG_ACTIVE;
518 }
519
520 data_len = count - hdr_size(file) - hdr_len;
521 packet->msg = ib_create_send_mad(agent,
522 be32_to_cpu(packet->mad.hdr.qpn),
523 packet->mad.hdr.pkey_index, rmpp_active,
524 hdr_len, data_len, GFP_KERNEL);
525 if (IS_ERR(packet->msg)) {
526 ret = PTR_ERR(packet->msg);
527 goto err_ah;
528 }
529
530 packet->msg->ah = ah;
531 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
532 packet->msg->retries = packet->mad.hdr.retries;
533 packet->msg->context[0] = packet;
534
535 /* Copy MAD header. Any RMPP header is already in place. */
536 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
537
538 if (!rmpp_active) {
539 if (copy_from_user(packet->msg->mad + copy_offset,
540 buf + copy_offset,
541 hdr_len + data_len - copy_offset)) {
542 ret = -EFAULT;
543 goto err_msg;
544 }
545 } else {
546 ret = copy_rmpp_mad(packet->msg, buf);
547 if (ret)
548 goto err_msg;
549 }
550
551 /*
552 * Set the high-order part of the transaction ID to make MADs from
553 * different agents unique, and allow routing responses back to the
554 * original requestor.
555 */
556 if (!ib_response_mad(packet->msg->mad)) {
557 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
558 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
559 (be64_to_cpup(tid) & 0xffffffff));
560 rmpp_mad->mad_hdr.tid = *tid;
561 }
562
563 spin_lock_irq(&file->send_lock);
564 ret = is_duplicate(file, packet);
565 if (!ret)
566 list_add_tail(&packet->list, &file->send_list);
567 spin_unlock_irq(&file->send_lock);
568 if (ret) {
569 ret = -EINVAL;
570 goto err_msg;
571 }
572
573 ret = ib_post_send_mad(packet->msg, NULL);
574 if (ret)
575 goto err_send;
576
577 mutex_unlock(&file->mutex);
578 return count;
579
580 err_send:
581 dequeue_send(file, packet);
582 err_msg:
583 ib_free_send_mad(packet->msg);
584 err_ah:
585 ib_destroy_ah(ah);
586 err_up:
587 mutex_unlock(&file->mutex);
588 err:
589 kfree(packet);
590 return ret;
591 }
592
593 static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
594 {
595 struct ib_umad_file *file = filp->private_data;
596
597 /* we will always be able to post a MAD send */
598 unsigned int mask = POLLOUT | POLLWRNORM;
599
600 poll_wait(filp, &file->recv_wait, wait);
601
602 if (!list_empty(&file->recv_list))
603 mask |= POLLIN | POLLRDNORM;
604
605 return mask;
606 }
607
608 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
609 int compat_method_mask)
610 {
611 struct ib_user_mad_reg_req ureq;
612 struct ib_mad_reg_req req;
613 struct ib_mad_agent *agent = NULL;
614 int agent_id;
615 int ret;
616
617 mutex_lock(&file->port->file_mutex);
618 mutex_lock(&file->mutex);
619
620 if (!file->port->ib_dev) {
621 ret = -EPIPE;
622 goto out;
623 }
624
625 if (copy_from_user(&ureq, arg, sizeof ureq)) {
626 ret = -EFAULT;
627 goto out;
628 }
629
630 if (ureq.qpn != 0 && ureq.qpn != 1) {
631 ret = -EINVAL;
632 goto out;
633 }
634
635 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
636 if (!__get_agent(file, agent_id))
637 goto found;
638
639 ret = -ENOMEM;
640 goto out;
641
642 found:
643 if (ureq.mgmt_class) {
644 req.mgmt_class = ureq.mgmt_class;
645 req.mgmt_class_version = ureq.mgmt_class_version;
646 memcpy(req.oui, ureq.oui, sizeof req.oui);
647
648 if (compat_method_mask) {
649 u32 *umm = (u32 *) ureq.method_mask;
650 int i;
651
652 for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
653 req.method_mask[i] =
654 umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
655 } else
656 memcpy(req.method_mask, ureq.method_mask,
657 sizeof req.method_mask);
658 }
659
660 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
661 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
662 ureq.mgmt_class ? &req : NULL,
663 ureq.rmpp_version,
664 send_handler, recv_handler, file);
665 if (IS_ERR(agent)) {
666 ret = PTR_ERR(agent);
667 agent = NULL;
668 goto out;
669 }
670
671 if (put_user(agent_id,
672 (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
673 ret = -EFAULT;
674 goto out;
675 }
676
677 if (!file->already_used) {
678 file->already_used = 1;
679 if (!file->use_pkey_index) {
680 printk(KERN_WARNING "user_mad: process %s did not enable "
681 "P_Key index support.\n", current->comm);
682 printk(KERN_WARNING "user_mad: Documentation/infiniband/user_mad.txt "
683 "has info on the new ABI.\n");
684 }
685 }
686
687 file->agent[agent_id] = agent;
688 ret = 0;
689
690 out:
691 mutex_unlock(&file->mutex);
692
693 if (ret && agent)
694 ib_unregister_mad_agent(agent);
695
696 mutex_unlock(&file->port->file_mutex);
697
698 return ret;
699 }
700
701 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
702 {
703 struct ib_mad_agent *agent = NULL;
704 u32 id;
705 int ret = 0;
706
707 if (get_user(id, arg))
708 return -EFAULT;
709
710 mutex_lock(&file->port->file_mutex);
711 mutex_lock(&file->mutex);
712
713 if (id < 0 || id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
714 ret = -EINVAL;
715 goto out;
716 }
717
718 agent = file->agent[id];
719 file->agent[id] = NULL;
720
721 out:
722 mutex_unlock(&file->mutex);
723
724 if (agent)
725 ib_unregister_mad_agent(agent);
726
727 mutex_unlock(&file->port->file_mutex);
728
729 return ret;
730 }
731
732 static long ib_umad_enable_pkey(struct ib_umad_file *file)
733 {
734 int ret = 0;
735
736 mutex_lock(&file->mutex);
737 if (file->already_used)
738 ret = -EINVAL;
739 else
740 file->use_pkey_index = 1;
741 mutex_unlock(&file->mutex);
742
743 return ret;
744 }
745
746 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
747 unsigned long arg)
748 {
749 switch (cmd) {
750 case IB_USER_MAD_REGISTER_AGENT:
751 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
752 case IB_USER_MAD_UNREGISTER_AGENT:
753 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
754 case IB_USER_MAD_ENABLE_PKEY:
755 return ib_umad_enable_pkey(filp->private_data);
756 default:
757 return -ENOIOCTLCMD;
758 }
759 }
760
761 #ifdef CONFIG_COMPAT
762 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
763 unsigned long arg)
764 {
765 switch (cmd) {
766 case IB_USER_MAD_REGISTER_AGENT:
767 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
768 case IB_USER_MAD_UNREGISTER_AGENT:
769 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
770 case IB_USER_MAD_ENABLE_PKEY:
771 return ib_umad_enable_pkey(filp->private_data);
772 default:
773 return -ENOIOCTLCMD;
774 }
775 }
776 #endif
777
778 /*
779 * ib_umad_open() does not need the BKL:
780 *
781 * - umad_port[] accesses are protected by port_lock, the
782 * ib_umad_port structures are properly reference counted, and
783 * everything else is purely local to the file being created, so
784 * races against other open calls are not a problem;
785 * - the ioctl method does not affect any global state outside of the
786 * file structure being operated on;
787 * - the port is added to umad_port[] as the last part of module
788 * initialization so the open method will either immediately run
789 * -ENXIO, or all required initialization will be done.
790 */
791 static int ib_umad_open(struct inode *inode, struct file *filp)
792 {
793 struct ib_umad_port *port;
794 struct ib_umad_file *file;
795 int ret = 0;
796
797 spin_lock(&port_lock);
798 port = umad_port[iminor(inode) - IB_UMAD_MINOR_BASE];
799 if (port)
800 kref_get(&port->umad_dev->ref);
801 spin_unlock(&port_lock);
802
803 if (!port)
804 return -ENXIO;
805
806 mutex_lock(&port->file_mutex);
807
808 if (!port->ib_dev) {
809 ret = -ENXIO;
810 goto out;
811 }
812
813 file = kzalloc(sizeof *file, GFP_KERNEL);
814 if (!file) {
815 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
816 ret = -ENOMEM;
817 goto out;
818 }
819
820 mutex_init(&file->mutex);
821 spin_lock_init(&file->send_lock);
822 INIT_LIST_HEAD(&file->recv_list);
823 INIT_LIST_HEAD(&file->send_list);
824 init_waitqueue_head(&file->recv_wait);
825
826 file->port = port;
827 filp->private_data = file;
828
829 list_add_tail(&file->port_list, &port->file_list);
830
831 out:
832 mutex_unlock(&port->file_mutex);
833 return ret;
834 }
835
836 static int ib_umad_close(struct inode *inode, struct file *filp)
837 {
838 struct ib_umad_file *file = filp->private_data;
839 struct ib_umad_device *dev = file->port->umad_dev;
840 struct ib_umad_packet *packet, *tmp;
841 int already_dead;
842 int i;
843
844 mutex_lock(&file->port->file_mutex);
845 mutex_lock(&file->mutex);
846
847 already_dead = file->agents_dead;
848 file->agents_dead = 1;
849
850 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
851 if (packet->recv_wc)
852 ib_free_recv_mad(packet->recv_wc);
853 kfree(packet);
854 }
855
856 list_del(&file->port_list);
857
858 mutex_unlock(&file->mutex);
859
860 if (!already_dead)
861 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
862 if (file->agent[i])
863 ib_unregister_mad_agent(file->agent[i]);
864
865 mutex_unlock(&file->port->file_mutex);
866
867 kfree(file);
868 kref_put(&dev->ref, ib_umad_release_dev);
869
870 return 0;
871 }
872
873 static const struct file_operations umad_fops = {
874 .owner = THIS_MODULE,
875 .read = ib_umad_read,
876 .write = ib_umad_write,
877 .poll = ib_umad_poll,
878 .unlocked_ioctl = ib_umad_ioctl,
879 #ifdef CONFIG_COMPAT
880 .compat_ioctl = ib_umad_compat_ioctl,
881 #endif
882 .open = ib_umad_open,
883 .release = ib_umad_close
884 };
885
886 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
887 {
888 struct ib_umad_port *port;
889 struct ib_port_modify props = {
890 .set_port_cap_mask = IB_PORT_SM
891 };
892 int ret;
893
894 spin_lock(&port_lock);
895 port = umad_port[iminor(inode) - IB_UMAD_MINOR_BASE - IB_UMAD_MAX_PORTS];
896 if (port)
897 kref_get(&port->umad_dev->ref);
898 spin_unlock(&port_lock);
899
900 if (!port)
901 return -ENXIO;
902
903 if (filp->f_flags & O_NONBLOCK) {
904 if (down_trylock(&port->sm_sem)) {
905 ret = -EAGAIN;
906 goto fail;
907 }
908 } else {
909 if (down_interruptible(&port->sm_sem)) {
910 ret = -ERESTARTSYS;
911 goto fail;
912 }
913 }
914
915 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
916 if (ret) {
917 up(&port->sm_sem);
918 goto fail;
919 }
920
921 filp->private_data = port;
922
923 return 0;
924
925 fail:
926 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
927 return ret;
928 }
929
930 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
931 {
932 struct ib_umad_port *port = filp->private_data;
933 struct ib_port_modify props = {
934 .clr_port_cap_mask = IB_PORT_SM
935 };
936 int ret = 0;
937
938 mutex_lock(&port->file_mutex);
939 if (port->ib_dev)
940 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
941 mutex_unlock(&port->file_mutex);
942
943 up(&port->sm_sem);
944
945 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
946
947 return ret;
948 }
949
950 static const struct file_operations umad_sm_fops = {
951 .owner = THIS_MODULE,
952 .open = ib_umad_sm_open,
953 .release = ib_umad_sm_close
954 };
955
956 static struct ib_client umad_client = {
957 .name = "umad",
958 .add = ib_umad_add_one,
959 .remove = ib_umad_remove_one
960 };
961
962 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
963 char *buf)
964 {
965 struct ib_umad_port *port = dev_get_drvdata(dev);
966
967 if (!port)
968 return -ENODEV;
969
970 return sprintf(buf, "%s\n", port->ib_dev->name);
971 }
972 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
973
974 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
975 char *buf)
976 {
977 struct ib_umad_port *port = dev_get_drvdata(dev);
978
979 if (!port)
980 return -ENODEV;
981
982 return sprintf(buf, "%d\n", port->port_num);
983 }
984 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
985
986 static ssize_t show_abi_version(struct class *class, char *buf)
987 {
988 return sprintf(buf, "%d\n", IB_USER_MAD_ABI_VERSION);
989 }
990 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
991
992 static int ib_umad_init_port(struct ib_device *device, int port_num,
993 struct ib_umad_port *port)
994 {
995 spin_lock(&port_lock);
996 port->dev_num = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
997 if (port->dev_num >= IB_UMAD_MAX_PORTS) {
998 spin_unlock(&port_lock);
999 return -1;
1000 }
1001 set_bit(port->dev_num, dev_map);
1002 spin_unlock(&port_lock);
1003
1004 port->ib_dev = device;
1005 port->port_num = port_num;
1006 init_MUTEX(&port->sm_sem);
1007 mutex_init(&port->file_mutex);
1008 INIT_LIST_HEAD(&port->file_list);
1009
1010 port->cdev = cdev_alloc();
1011 if (!port->cdev)
1012 return -1;
1013 port->cdev->owner = THIS_MODULE;
1014 port->cdev->ops = &umad_fops;
1015 kobject_set_name(&port->cdev->kobj, "umad%d", port->dev_num);
1016 if (cdev_add(port->cdev, base_dev + port->dev_num, 1))
1017 goto err_cdev;
1018
1019 port->dev = device_create(umad_class, device->dma_device,
1020 port->cdev->dev, port,
1021 "umad%d", port->dev_num);
1022 if (IS_ERR(port->dev))
1023 goto err_cdev;
1024
1025 if (device_create_file(port->dev, &dev_attr_ibdev))
1026 goto err_dev;
1027 if (device_create_file(port->dev, &dev_attr_port))
1028 goto err_dev;
1029
1030 port->sm_cdev = cdev_alloc();
1031 if (!port->sm_cdev)
1032 goto err_dev;
1033 port->sm_cdev->owner = THIS_MODULE;
1034 port->sm_cdev->ops = &umad_sm_fops;
1035 kobject_set_name(&port->sm_cdev->kobj, "issm%d", port->dev_num);
1036 if (cdev_add(port->sm_cdev, base_dev + port->dev_num + IB_UMAD_MAX_PORTS, 1))
1037 goto err_sm_cdev;
1038
1039 port->sm_dev = device_create(umad_class, device->dma_device,
1040 port->sm_cdev->dev, port,
1041 "issm%d", port->dev_num);
1042 if (IS_ERR(port->sm_dev))
1043 goto err_sm_cdev;
1044
1045 if (device_create_file(port->sm_dev, &dev_attr_ibdev))
1046 goto err_sm_dev;
1047 if (device_create_file(port->sm_dev, &dev_attr_port))
1048 goto err_sm_dev;
1049
1050 spin_lock(&port_lock);
1051 umad_port[port->dev_num] = port;
1052 spin_unlock(&port_lock);
1053
1054 return 0;
1055
1056 err_sm_dev:
1057 device_destroy(umad_class, port->sm_cdev->dev);
1058
1059 err_sm_cdev:
1060 cdev_del(port->sm_cdev);
1061
1062 err_dev:
1063 device_destroy(umad_class, port->cdev->dev);
1064
1065 err_cdev:
1066 cdev_del(port->cdev);
1067 clear_bit(port->dev_num, dev_map);
1068
1069 return -1;
1070 }
1071
1072 static void ib_umad_kill_port(struct ib_umad_port *port)
1073 {
1074 struct ib_umad_file *file;
1075 int already_dead;
1076 int id;
1077
1078 dev_set_drvdata(port->dev, NULL);
1079 dev_set_drvdata(port->sm_dev, NULL);
1080
1081 device_destroy(umad_class, port->cdev->dev);
1082 device_destroy(umad_class, port->sm_cdev->dev);
1083
1084 cdev_del(port->cdev);
1085 cdev_del(port->sm_cdev);
1086
1087 spin_lock(&port_lock);
1088 umad_port[port->dev_num] = NULL;
1089 spin_unlock(&port_lock);
1090
1091 mutex_lock(&port->file_mutex);
1092
1093 port->ib_dev = NULL;
1094
1095 list_for_each_entry(file, &port->file_list, port_list) {
1096 mutex_lock(&file->mutex);
1097 already_dead = file->agents_dead;
1098 file->agents_dead = 1;
1099 mutex_unlock(&file->mutex);
1100
1101 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1102 if (file->agent[id])
1103 ib_unregister_mad_agent(file->agent[id]);
1104 }
1105
1106 mutex_unlock(&port->file_mutex);
1107
1108 clear_bit(port->dev_num, dev_map);
1109 }
1110
1111 static void ib_umad_add_one(struct ib_device *device)
1112 {
1113 struct ib_umad_device *umad_dev;
1114 int s, e, i;
1115
1116 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1117 return;
1118
1119 if (device->node_type == RDMA_NODE_IB_SWITCH)
1120 s = e = 0;
1121 else {
1122 s = 1;
1123 e = device->phys_port_cnt;
1124 }
1125
1126 umad_dev = kzalloc(sizeof *umad_dev +
1127 (e - s + 1) * sizeof (struct ib_umad_port),
1128 GFP_KERNEL);
1129 if (!umad_dev)
1130 return;
1131
1132 kref_init(&umad_dev->ref);
1133
1134 umad_dev->start_port = s;
1135 umad_dev->end_port = e;
1136
1137 for (i = s; i <= e; ++i) {
1138 umad_dev->port[i - s].umad_dev = umad_dev;
1139
1140 if (ib_umad_init_port(device, i, &umad_dev->port[i - s]))
1141 goto err;
1142 }
1143
1144 ib_set_client_data(device, &umad_client, umad_dev);
1145
1146 return;
1147
1148 err:
1149 while (--i >= s)
1150 ib_umad_kill_port(&umad_dev->port[i - s]);
1151
1152 kref_put(&umad_dev->ref, ib_umad_release_dev);
1153 }
1154
1155 static void ib_umad_remove_one(struct ib_device *device)
1156 {
1157 struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client);
1158 int i;
1159
1160 if (!umad_dev)
1161 return;
1162
1163 for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i)
1164 ib_umad_kill_port(&umad_dev->port[i]);
1165
1166 kref_put(&umad_dev->ref, ib_umad_release_dev);
1167 }
1168
1169 static int __init ib_umad_init(void)
1170 {
1171 int ret;
1172
1173 ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
1174 "infiniband_mad");
1175 if (ret) {
1176 printk(KERN_ERR "user_mad: couldn't register device number\n");
1177 goto out;
1178 }
1179
1180 umad_class = class_create(THIS_MODULE, "infiniband_mad");
1181 if (IS_ERR(umad_class)) {
1182 ret = PTR_ERR(umad_class);
1183 printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n");
1184 goto out_chrdev;
1185 }
1186
1187 ret = class_create_file(umad_class, &class_attr_abi_version);
1188 if (ret) {
1189 printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n");
1190 goto out_class;
1191 }
1192
1193 ret = ib_register_client(&umad_client);
1194 if (ret) {
1195 printk(KERN_ERR "user_mad: couldn't register ib_umad client\n");
1196 goto out_class;
1197 }
1198
1199 return 0;
1200
1201 out_class:
1202 class_destroy(umad_class);
1203
1204 out_chrdev:
1205 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1206
1207 out:
1208 return ret;
1209 }
1210
1211 static void __exit ib_umad_cleanup(void)
1212 {
1213 ib_unregister_client(&umad_client);
1214 class_destroy(umad_class);
1215 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1216 }
1217
1218 module_init(ib_umad_init);
1219 module_exit(ib_umad_cleanup);
Linux with added FPC-III support