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fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / drivers / infiniband / core / user_mad.c
blobb53eac4611de387b6eb8f831108810205204d5c1
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 5596 2006-03-03 01:00:07Z sean.hefty $
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/dma-mapping.h>
44 #include <linux/poll.h>
45 #include <linux/rwsem.h>
46 #include <linux/kref.h>
47 #include <linux/compat.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 /*
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
89 struct 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
106 struct ib_umad_device {
107 int start_port, end_port;
108 struct kref ref;
109 struct ib_umad_port port[0];
110 };
111
112 struct ib_umad_file {
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 recv_lock;
118 spinlock_t send_lock;
119 wait_queue_head_t recv_wait;
120 struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS];
121 int agents_dead;
122 u8 use_pkey_index;
123 u8 already_used;
124 };
125
126 struct ib_umad_packet {
127 struct ib_mad_send_buf *msg;
128 struct ib_mad_recv_wc *recv_wc;
129 struct list_head list;
130 int length;
131 struct ib_user_mad mad;
132 };
133
134 static struct class *umad_class;
135
136 static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
137
138 static DEFINE_SPINLOCK(port_lock);
139 static struct ib_umad_port *umad_port[IB_UMAD_MAX_PORTS];
140 static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS);
141
142 static void ib_umad_add_one(struct ib_device *device);
143 static void ib_umad_remove_one(struct ib_device *device);
144
145 static void ib_umad_release_dev(struct kref *ref)
146 {
147 struct ib_umad_device *dev =
148 container_of(ref, struct ib_umad_device, ref);
149
150 kfree(dev);
151 }
152
153 static int hdr_size(struct ib_umad_file *file)
154 {
155 return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) :
156 sizeof (struct ib_user_mad_hdr_old);
157 }
158
159 /* caller must hold port->mutex at least for reading */
160 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
161 {
162 return file->agents_dead ? NULL : file->agent[id];
163 }
164
165 static int queue_packet(struct ib_umad_file *file,
166 struct ib_mad_agent *agent,
167 struct ib_umad_packet *packet)
168 {
169 int ret = 1;
170
171 down_read(&file->port->mutex);
172
173 for (packet->mad.hdr.id = 0;
174 packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
175 packet->mad.hdr.id++)
176 if (agent == __get_agent(file, packet->mad.hdr.id)) {
177 spin_lock_irq(&file->recv_lock);
178 list_add_tail(&packet->list, &file->recv_list);
179 spin_unlock_irq(&file->recv_lock);
180 wake_up_interruptible(&file->recv_wait);
181 ret = 0;
182 break;
183 }
184
185 up_read(&file->port->mutex);
186
187 return ret;
188 }
189
190 static void dequeue_send(struct ib_umad_file *file,
191 struct ib_umad_packet *packet)
192 {
193 spin_lock_irq(&file->send_lock);
194 list_del(&packet->list);
195 spin_unlock_irq(&file->send_lock);
196 }
197
198 static void send_handler(struct ib_mad_agent *agent,
199 struct ib_mad_send_wc *send_wc)
200 {
201 struct ib_umad_file *file = agent->context;
202 struct ib_umad_packet *packet = send_wc->send_buf->context[0];
203
204 dequeue_send(file, packet);
205 ib_destroy_ah(packet->msg->ah);
206 ib_free_send_mad(packet->msg);
207
208 if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
209 packet->length = IB_MGMT_MAD_HDR;
210 packet->mad.hdr.status = ETIMEDOUT;
211 if (!queue_packet(file, agent, packet))
212 return;
213 }
214 kfree(packet);
215 }
216
217 static void recv_handler(struct ib_mad_agent *agent,
218 struct ib_mad_recv_wc *mad_recv_wc)
219 {
220 struct ib_umad_file *file = agent->context;
221 struct ib_umad_packet *packet;
222
223 if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
224 goto err1;
225
226 packet = kzalloc(sizeof *packet, GFP_KERNEL);
227 if (!packet)
228 goto err1;
229
230 packet->length = mad_recv_wc->mad_len;
231 packet->recv_wc = mad_recv_wc;
232
233 packet->mad.hdr.status = 0;
234 packet->mad.hdr.length = hdr_size(file) + mad_recv_wc->mad_len;
235 packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp);
236 packet->mad.hdr.lid = cpu_to_be16(mad_recv_wc->wc->slid);
237 packet->mad.hdr.sl = mad_recv_wc->wc->sl;
238 packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits;
239 packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;
240 packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
241 if (packet->mad.hdr.grh_present) {
242 struct ib_ah_attr ah_attr;
243
244 ib_init_ah_from_wc(agent->device, agent->port_num,
245 mad_recv_wc->wc, mad_recv_wc->recv_buf.grh,
246 &ah_attr);
247
248 packet->mad.hdr.gid_index = ah_attr.grh.sgid_index;
249 packet->mad.hdr.hop_limit = ah_attr.grh.hop_limit;
250 packet->mad.hdr.traffic_class = ah_attr.grh.traffic_class;
251 memcpy(packet->mad.hdr.gid, &ah_attr.grh.dgid, 16);
252 packet->mad.hdr.flow_label = cpu_to_be32(ah_attr.grh.flow_label);
253 }
254
255 if (queue_packet(file, agent, packet))
256 goto err2;
257 return;
258
259 err2:
260 kfree(packet);
261 err1:
262 ib_free_recv_mad(mad_recv_wc);
263 }
264
265 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
266 struct ib_umad_packet *packet, size_t count)
267 {
268 struct ib_mad_recv_buf *recv_buf;
269 int left, seg_payload, offset, max_seg_payload;
270
271 /* We need enough room to copy the first (or only) MAD segment. */
272 recv_buf = &packet->recv_wc->recv_buf;
273 if ((packet->length <= sizeof (*recv_buf->mad) &&
274 count < hdr_size(file) + packet->length) ||
275 (packet->length > sizeof (*recv_buf->mad) &&
276 count < hdr_size(file) + sizeof (*recv_buf->mad)))
277 return -EINVAL;
278
279 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
280 return -EFAULT;
281
282 buf += hdr_size(file);
283 seg_payload = min_t(int, packet->length, sizeof (*recv_buf->mad));
284 if (copy_to_user(buf, recv_buf->mad, seg_payload))
285 return -EFAULT;
286
287 if (seg_payload < packet->length) {
288 /*
289 * Multipacket RMPP MAD message. Copy remainder of message.
290 * Note that last segment may have a shorter payload.
291 */
292 if (count < hdr_size(file) + packet->length) {
293 /*
294 * The buffer is too small, return the first RMPP segment,
295 * which includes the RMPP message length.
296 */
297 return -ENOSPC;
298 }
299 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
300 max_seg_payload = sizeof (struct ib_mad) - offset;
301
302 for (left = packet->length - seg_payload, buf += seg_payload;
303 left; left -= seg_payload, buf += seg_payload) {
304 recv_buf = container_of(recv_buf->list.next,
305 struct ib_mad_recv_buf, list);
306 seg_payload = min(left, max_seg_payload);
307 if (copy_to_user(buf, ((void *) recv_buf->mad) + offset,
308 seg_payload))
309 return -EFAULT;
310 }
311 }
312 return hdr_size(file) + packet->length;
313 }
314
315 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
316 struct ib_umad_packet *packet, size_t count)
317 {
318 ssize_t size = hdr_size(file) + packet->length;
319
320 if (count < size)
321 return -EINVAL;
322
323 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
324 return -EFAULT;
325
326 buf += hdr_size(file);
327
328 if (copy_to_user(buf, packet->mad.data, packet->length))
329 return -EFAULT;
330
331 return size;
332 }
333
334 static ssize_t ib_umad_read(struct file *filp, char __user *buf,
335 size_t count, loff_t *pos)
336 {
337 struct ib_umad_file *file = filp->private_data;
338 struct ib_umad_packet *packet;
339 ssize_t ret;
340
341 if (count < hdr_size(file))
342 return -EINVAL;
343
344 spin_lock_irq(&file->recv_lock);
345
346 while (list_empty(&file->recv_list)) {
347 spin_unlock_irq(&file->recv_lock);
348
349 if (filp->f_flags & O_NONBLOCK)
350 return -EAGAIN;
351
352 if (wait_event_interruptible(file->recv_wait,
353 !list_empty(&file->recv_list)))
354 return -ERESTARTSYS;
355
356 spin_lock_irq(&file->recv_lock);
357 }
358
359 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
360 list_del(&packet->list);
361
362 spin_unlock_irq(&file->recv_lock);
363
364 if (packet->recv_wc)
365 ret = copy_recv_mad(file, buf, packet, count);
366 else
367 ret = copy_send_mad(file, buf, packet, count);
368
369 if (ret < 0) {
370 /* Requeue packet */
371 spin_lock_irq(&file->recv_lock);
372 list_add(&packet->list, &file->recv_list);
373 spin_unlock_irq(&file->recv_lock);
374 } else {
375 if (packet->recv_wc)
376 ib_free_recv_mad(packet->recv_wc);
377 kfree(packet);
378 }
379 return ret;
380 }
381
382 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
383 {
384 int left, seg;
385
386 /* Copy class specific header */
387 if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
388 copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
389 msg->hdr_len - IB_MGMT_RMPP_HDR))
390 return -EFAULT;
391
392 /* All headers are in place. Copy data segments. */
393 for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
394 seg++, left -= msg->seg_size, buf += msg->seg_size) {
395 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
396 min(left, msg->seg_size)))
397 return -EFAULT;
398 }
399 return 0;
400 }
401
402 static int same_destination(struct ib_user_mad_hdr *hdr1,
403 struct ib_user_mad_hdr *hdr2)
404 {
405 if (!hdr1->grh_present && !hdr2->grh_present)
406 return (hdr1->lid == hdr2->lid);
407
408 if (hdr1->grh_present && hdr2->grh_present)
409 return !memcmp(hdr1->gid, hdr2->gid, 16);
410
411 return 0;
412 }
413
414 static int is_duplicate(struct ib_umad_file *file,
415 struct ib_umad_packet *packet)
416 {
417 struct ib_umad_packet *sent_packet;
418 struct ib_mad_hdr *sent_hdr, *hdr;
419
420 hdr = (struct ib_mad_hdr *) packet->mad.data;
421 list_for_each_entry(sent_packet, &file->send_list, list) {
422 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
423
424 if ((hdr->tid != sent_hdr->tid) ||
425 (hdr->mgmt_class != sent_hdr->mgmt_class))
426 continue;
427
428 /*
429 * No need to be overly clever here. If two new operations have
430 * the same TID, reject the second as a duplicate. This is more
431 * restrictive than required by the spec.
432 */
433 if (!ib_response_mad((struct ib_mad *) hdr)) {
434 if (!ib_response_mad((struct ib_mad *) sent_hdr))
435 return 1;
436 continue;
437 } else if (!ib_response_mad((struct ib_mad *) sent_hdr))
438 continue;
439
440 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
441 return 1;
442 }
443
444 return 0;
445 }
446
447 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
448 size_t count, loff_t *pos)
449 {
450 struct ib_umad_file *file = filp->private_data;
451 struct ib_umad_packet *packet;
452 struct ib_mad_agent *agent;
453 struct ib_ah_attr ah_attr;
454 struct ib_ah *ah;
455 struct ib_rmpp_mad *rmpp_mad;
456 __be64 *tid;
457 int ret, data_len, hdr_len, copy_offset, rmpp_active;
458
459 if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
460 return -EINVAL;
461
462 packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
463 if (!packet)
464 return -ENOMEM;
465
466 if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
467 ret = -EFAULT;
468 goto err;
469 }
470
471 if (packet->mad.hdr.id < 0 ||
472 packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
473 ret = -EINVAL;
474 goto err;
475 }
476
477 buf += hdr_size(file);
478
479 if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
480 ret = -EFAULT;
481 goto err;
482 }
483
484 down_read(&file->port->mutex);
485
486 agent = __get_agent(file, packet->mad.hdr.id);
487 if (!agent) {
488 ret = -EINVAL;
489 goto err_up;
490 }
491
492 memset(&ah_attr, 0, sizeof ah_attr);
493 ah_attr.dlid = be16_to_cpu(packet->mad.hdr.lid);
494 ah_attr.sl = packet->mad.hdr.sl;
495 ah_attr.src_path_bits = packet->mad.hdr.path_bits;
496 ah_attr.port_num = file->port->port_num;
497 if (packet->mad.hdr.grh_present) {
498 ah_attr.ah_flags = IB_AH_GRH;
499 memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16);
500 ah_attr.grh.sgid_index = packet->mad.hdr.gid_index;
501 ah_attr.grh.flow_label = be32_to_cpu(packet->mad.hdr.flow_label);
502 ah_attr.grh.hop_limit = packet->mad.hdr.hop_limit;
503 ah_attr.grh.traffic_class = packet->mad.hdr.traffic_class;
504 }
505
506 ah = ib_create_ah(agent->qp->pd, &ah_attr);
507 if (IS_ERR(ah)) {
508 ret = PTR_ERR(ah);
509 goto err_up;
510 }
511
512 rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
513 hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
514 if (!ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)) {
515 copy_offset = IB_MGMT_MAD_HDR;
516 rmpp_active = 0;
517 } else {
518 copy_offset = IB_MGMT_RMPP_HDR;
519 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
520 IB_MGMT_RMPP_FLAG_ACTIVE;
521 }
522
523 data_len = count - hdr_size(file) - hdr_len;
524 packet->msg = ib_create_send_mad(agent,
525 be32_to_cpu(packet->mad.hdr.qpn),
526 packet->mad.hdr.pkey_index, rmpp_active,
527 hdr_len, data_len, GFP_KERNEL);
528 if (IS_ERR(packet->msg)) {
529 ret = PTR_ERR(packet->msg);
530 goto err_ah;
531 }
532
533 packet->msg->ah = ah;
534 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
535 packet->msg->retries = packet->mad.hdr.retries;
536 packet->msg->context[0] = packet;
537
538 /* Copy MAD header. Any RMPP header is already in place. */
539 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
540
541 if (!rmpp_active) {
542 if (copy_from_user(packet->msg->mad + copy_offset,
543 buf + copy_offset,
544 hdr_len + data_len - copy_offset)) {
545 ret = -EFAULT;
546 goto err_msg;
547 }
548 } else {
549 ret = copy_rmpp_mad(packet->msg, buf);
550 if (ret)
551 goto err_msg;
552 }
553
554 /*
555 * Set the high-order part of the transaction ID to make MADs from
556 * different agents unique, and allow routing responses back to the
557 * original requestor.
558 */
559 if (!ib_response_mad(packet->msg->mad)) {
560 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
561 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
562 (be64_to_cpup(tid) & 0xffffffff));
563 rmpp_mad->mad_hdr.tid = *tid;
564 }
565
566 spin_lock_irq(&file->send_lock);
567 ret = is_duplicate(file, packet);
568 if (!ret)
569 list_add_tail(&packet->list, &file->send_list);
570 spin_unlock_irq(&file->send_lock);
571 if (ret) {
572 ret = -EINVAL;
573 goto err_msg;
574 }
575
576 ret = ib_post_send_mad(packet->msg, NULL);
577 if (ret)
578 goto err_send;
579
580 up_read(&file->port->mutex);
581 return count;
582
583 err_send:
584 dequeue_send(file, packet);
585 err_msg:
586 ib_free_send_mad(packet->msg);
587 err_ah:
588 ib_destroy_ah(ah);
589 err_up:
590 up_read(&file->port->mutex);
591 err:
592 kfree(packet);
593 return ret;
594 }
595
596 static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
597 {
598 struct ib_umad_file *file = filp->private_data;
599
600 /* we will always be able to post a MAD send */
601 unsigned int mask = POLLOUT | POLLWRNORM;
602
603 poll_wait(filp, &file->recv_wait, wait);
604
605 if (!list_empty(&file->recv_list))
606 mask |= POLLIN | POLLRDNORM;
607
608 return mask;
609 }
610
611 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
612 int compat_method_mask)
613 {
614 struct ib_user_mad_reg_req ureq;
615 struct ib_mad_reg_req req;
616 struct ib_mad_agent *agent;
617 int agent_id;
618 int ret;
619
620 down_write(&file->port->mutex);
621
622 if (!file->port->ib_dev) {
623 ret = -EPIPE;
624 goto out;
625 }
626
627 if (copy_from_user(&ureq, arg, sizeof ureq)) {
628 ret = -EFAULT;
629 goto out;
630 }
631
632 if (ureq.qpn != 0 && ureq.qpn != 1) {
633 ret = -EINVAL;
634 goto out;
635 }
636
637 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
638 if (!__get_agent(file, agent_id))
639 goto found;
640
641 ret = -ENOMEM;
642 goto out;
643
644 found:
645 if (ureq.mgmt_class) {
646 req.mgmt_class = ureq.mgmt_class;
647 req.mgmt_class_version = ureq.mgmt_class_version;
648 memcpy(req.oui, ureq.oui, sizeof req.oui);
649
650 if (compat_method_mask) {
651 u32 *umm = (u32 *) ureq.method_mask;
652 int i;
653
654 for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
655 req.method_mask[i] =
656 umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
657 } else
658 memcpy(req.method_mask, ureq.method_mask,
659 sizeof req.method_mask);
660 }
661
662 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
663 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
664 ureq.mgmt_class ? &req : NULL,
665 ureq.rmpp_version,
666 send_handler, recv_handler, file);
667 if (IS_ERR(agent)) {
668 ret = PTR_ERR(agent);
669 goto out;
670 }
671
672 if (put_user(agent_id,
673 (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
674 ret = -EFAULT;
675 ib_unregister_mad_agent(agent);
676 goto out;
677 }
678
679 if (!file->already_used) {
680 file->already_used = 1;
681 if (!file->use_pkey_index) {
682 printk(KERN_WARNING "user_mad: process %s did not enable "
683 "P_Key index support.\n", current->comm);
684 printk(KERN_WARNING "user_mad: Documentation/infiniband/user_mad.txt "
685 "has info on the new ABI.\n");
686 }
687 }
688
689 file->agent[agent_id] = agent;
690 ret = 0;
691
692 out:
693 up_write(&file->port->mutex);
694 return ret;
695 }
696
697 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
698 {
699 struct ib_mad_agent *agent = NULL;
700 u32 id;
701 int ret = 0;
702
703 if (get_user(id, arg))
704 return -EFAULT;
705
706 down_write(&file->port->mutex);
707
708 if (id < 0 || id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
709 ret = -EINVAL;
710 goto out;
711 }
712
713 agent = file->agent[id];
714 file->agent[id] = NULL;
715
716 out:
717 up_write(&file->port->mutex);
718
719 if (agent)
720 ib_unregister_mad_agent(agent);
721
722 return ret;
723 }
724
725 static long ib_umad_enable_pkey(struct ib_umad_file *file)
726 {
727 int ret = 0;
728
729 down_write(&file->port->mutex);
730 if (file->already_used)
731 ret = -EINVAL;
732 else
733 file->use_pkey_index = 1;
734 up_write(&file->port->mutex);
735
736 return ret;
737 }
738
739 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
740 unsigned long arg)
741 {
742 switch (cmd) {
743 case IB_USER_MAD_REGISTER_AGENT:
744 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
745 case IB_USER_MAD_UNREGISTER_AGENT:
746 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
747 case IB_USER_MAD_ENABLE_PKEY:
748 return ib_umad_enable_pkey(filp->private_data);
749 default:
750 return -ENOIOCTLCMD;
751 }
752 }
753
754 #ifdef CONFIG_COMPAT
755 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
756 unsigned long arg)
757 {
758 switch (cmd) {
759 case IB_USER_MAD_REGISTER_AGENT:
760 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
761 case IB_USER_MAD_UNREGISTER_AGENT:
762 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
763 case IB_USER_MAD_ENABLE_PKEY:
764 return ib_umad_enable_pkey(filp->private_data);
765 default:
766 return -ENOIOCTLCMD;
767 }
768 }
769 #endif
770
771 static int ib_umad_open(struct inode *inode, struct file *filp)
772 {
773 struct ib_umad_port *port;
774 struct ib_umad_file *file;
775 int ret = 0;
776
777 spin_lock(&port_lock);
778 port = umad_port[iminor(inode) - IB_UMAD_MINOR_BASE];
779 if (port)
780 kref_get(&port->umad_dev->ref);
781 spin_unlock(&port_lock);
782
783 if (!port)
784 return -ENXIO;
785
786 down_write(&port->mutex);
787
788 if (!port->ib_dev) {
789 ret = -ENXIO;
790 goto out;
791 }
792
793 file = kzalloc(sizeof *file, GFP_KERNEL);
794 if (!file) {
795 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
796 ret = -ENOMEM;
797 goto out;
798 }
799
800 spin_lock_init(&file->recv_lock);
801 spin_lock_init(&file->send_lock);
802 INIT_LIST_HEAD(&file->recv_list);
803 INIT_LIST_HEAD(&file->send_list);
804 init_waitqueue_head(&file->recv_wait);
805
806 file->port = port;
807 filp->private_data = file;
808
809 list_add_tail(&file->port_list, &port->file_list);
810
811 out:
812 up_write(&port->mutex);
813 return ret;
814 }
815
816 static int ib_umad_close(struct inode *inode, struct file *filp)
817 {
818 struct ib_umad_file *file = filp->private_data;
819 struct ib_umad_device *dev = file->port->umad_dev;
820 struct ib_umad_packet *packet, *tmp;
821 int already_dead;
822 int i;
823
824 down_write(&file->port->mutex);
825
826 already_dead = file->agents_dead;
827 file->agents_dead = 1;
828
829 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
830 if (packet->recv_wc)
831 ib_free_recv_mad(packet->recv_wc);
832 kfree(packet);
833 }
834
835 list_del(&file->port_list);
836
837 downgrade_write(&file->port->mutex);
838
839 if (!already_dead)
840 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
841 if (file->agent[i])
842 ib_unregister_mad_agent(file->agent[i]);
843
844 up_read(&file->port->mutex);
845
846 kfree(file);
847 kref_put(&dev->ref, ib_umad_release_dev);
848
849 return 0;
850 }
851
852 static const struct file_operations umad_fops = {
853 .owner = THIS_MODULE,
854 .read = ib_umad_read,
855 .write = ib_umad_write,
856 .poll = ib_umad_poll,
857 .unlocked_ioctl = ib_umad_ioctl,
858 #ifdef CONFIG_COMPAT
859 .compat_ioctl = ib_umad_compat_ioctl,
860 #endif
861 .open = ib_umad_open,
862 .release = ib_umad_close
863 };
864
865 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
866 {
867 struct ib_umad_port *port;
868 struct ib_port_modify props = {
869 .set_port_cap_mask = IB_PORT_SM
870 };
871 int ret;
872
873 spin_lock(&port_lock);
874 port = umad_port[iminor(inode) - IB_UMAD_MINOR_BASE - IB_UMAD_MAX_PORTS];
875 if (port)
876 kref_get(&port->umad_dev->ref);
877 spin_unlock(&port_lock);
878
879 if (!port)
880 return -ENXIO;
881
882 if (filp->f_flags & O_NONBLOCK) {
883 if (down_trylock(&port->sm_sem)) {
884 ret = -EAGAIN;
885 goto fail;
886 }
887 } else {
888 if (down_interruptible(&port->sm_sem)) {
889 ret = -ERESTARTSYS;
890 goto fail;
891 }
892 }
893
894 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
895 if (ret) {
896 up(&port->sm_sem);
897 goto fail;
898 }
899
900 filp->private_data = port;
901
902 return 0;
903
904 fail:
905 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
906 return ret;
907 }
908
909 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
910 {
911 struct ib_umad_port *port = filp->private_data;
912 struct ib_port_modify props = {
913 .clr_port_cap_mask = IB_PORT_SM
914 };
915 int ret = 0;
916
917 down_write(&port->mutex);
918 if (port->ib_dev)
919 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
920 up_write(&port->mutex);
921
922 up(&port->sm_sem);
923
924 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
925
926 return ret;
927 }
928
929 static const struct file_operations umad_sm_fops = {
930 .owner = THIS_MODULE,
931 .open = ib_umad_sm_open,
932 .release = ib_umad_sm_close
933 };
934
935 static struct ib_client umad_client = {
936 .name = "umad",
937 .add = ib_umad_add_one,
938 .remove = ib_umad_remove_one
939 };
940
941 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
942 {
943 struct ib_umad_port *port = class_get_devdata(class_dev);
944
945 if (!port)
946 return -ENODEV;
947
948 return sprintf(buf, "%s\n", port->ib_dev->name);
949 }
950 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
951
952 static ssize_t show_port(struct class_device *class_dev, char *buf)
953 {
954 struct ib_umad_port *port = class_get_devdata(class_dev);
955
956 if (!port)
957 return -ENODEV;
958
959 return sprintf(buf, "%d\n", port->port_num);
960 }
961 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
962
963 static ssize_t show_abi_version(struct class *class, char *buf)
964 {
965 return sprintf(buf, "%d\n", IB_USER_MAD_ABI_VERSION);
966 }
967 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
968
969 static int ib_umad_init_port(struct ib_device *device, int port_num,
970 struct ib_umad_port *port)
971 {
972 spin_lock(&port_lock);
973 port->dev_num = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
974 if (port->dev_num >= IB_UMAD_MAX_PORTS) {
975 spin_unlock(&port_lock);
976 return -1;
977 }
978 set_bit(port->dev_num, dev_map);
979 spin_unlock(&port_lock);
980
981 port->ib_dev = device;
982 port->port_num = port_num;
983 init_MUTEX(&port->sm_sem);
984 init_rwsem(&port->mutex);
985 INIT_LIST_HEAD(&port->file_list);
986
987 port->dev = cdev_alloc();
988 if (!port->dev)
989 return -1;
990 port->dev->owner = THIS_MODULE;
991 port->dev->ops = &umad_fops;
992 kobject_set_name(&port->dev->kobj, "umad%d", port->dev_num);
993 if (cdev_add(port->dev, base_dev + port->dev_num, 1))
994 goto err_cdev;
995
996 port->class_dev = class_device_create(umad_class, NULL, port->dev->dev,
997 device->dma_device,
998 "umad%d", port->dev_num);
999 if (IS_ERR(port->class_dev))
1000 goto err_cdev;
1001
1002 if (class_device_create_file(port->class_dev, &class_device_attr_ibdev))
1003 goto err_class;
1004 if (class_device_create_file(port->class_dev, &class_device_attr_port))
1005 goto err_class;
1006
1007 port->sm_dev = cdev_alloc();
1008 if (!port->sm_dev)
1009 goto err_class;
1010 port->sm_dev->owner = THIS_MODULE;
1011 port->sm_dev->ops = &umad_sm_fops;
1012 kobject_set_name(&port->sm_dev->kobj, "issm%d", port->dev_num);
1013 if (cdev_add(port->sm_dev, base_dev + port->dev_num + IB_UMAD_MAX_PORTS, 1))
1014 goto err_sm_cdev;
1015
1016 port->sm_class_dev = class_device_create(umad_class, NULL, port->sm_dev->dev,
1017 device->dma_device,
1018 "issm%d", port->dev_num);
1019 if (IS_ERR(port->sm_class_dev))
1020 goto err_sm_cdev;
1021
1022 class_set_devdata(port->class_dev, port);
1023 class_set_devdata(port->sm_class_dev, port);
1024
1025 if (class_device_create_file(port->sm_class_dev, &class_device_attr_ibdev))
1026 goto err_sm_class;
1027 if (class_device_create_file(port->sm_class_dev, &class_device_attr_port))
1028 goto err_sm_class;
1029
1030 spin_lock(&port_lock);
1031 umad_port[port->dev_num] = port;
1032 spin_unlock(&port_lock);
1033
1034 return 0;
1035
1036 err_sm_class:
1037 class_device_destroy(umad_class, port->sm_dev->dev);
1038
1039 err_sm_cdev:
1040 cdev_del(port->sm_dev);
1041
1042 err_class:
1043 class_device_destroy(umad_class, port->dev->dev);
1044
1045 err_cdev:
1046 cdev_del(port->dev);
1047 clear_bit(port->dev_num, dev_map);
1048
1049 return -1;
1050 }
1051
1052 static void ib_umad_kill_port(struct ib_umad_port *port)
1053 {
1054 struct ib_umad_file *file;
1055 int id;
1056
1057 class_set_devdata(port->class_dev, NULL);
1058 class_set_devdata(port->sm_class_dev, NULL);
1059
1060 class_device_destroy(umad_class, port->dev->dev);
1061 class_device_destroy(umad_class, port->sm_dev->dev);
1062
1063 cdev_del(port->dev);
1064 cdev_del(port->sm_dev);
1065
1066 spin_lock(&port_lock);
1067 umad_port[port->dev_num] = NULL;
1068 spin_unlock(&port_lock);
1069
1070 down_write(&port->mutex);
1071
1072 port->ib_dev = NULL;
1073
1074 /*
1075 * Now go through the list of files attached to this port and
1076 * unregister all of their MAD agents. We need to hold
1077 * port->mutex while doing this to avoid racing with
1078 * ib_umad_close(), but we can't hold the mutex for writing
1079 * while calling ib_unregister_mad_agent(), since that might
1080 * deadlock by calling back into queue_packet(). So we
1081 * downgrade our lock to a read lock, and then drop and
1082 * reacquire the write lock for the next iteration.
1083 *
1084 * We do list_del_init() on the file's list_head so that the
1085 * list_del in ib_umad_close() is still OK, even after the
1086 * file is removed from the list.
1087 */
1088 while (!list_empty(&port->file_list)) {
1089 file = list_entry(port->file_list.next, struct ib_umad_file,
1090 port_list);
1091
1092 file->agents_dead = 1;
1093 list_del_init(&file->port_list);
1094
1095 downgrade_write(&port->mutex);
1096
1097 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1098 if (file->agent[id])
1099 ib_unregister_mad_agent(file->agent[id]);
1100
1101 up_read(&port->mutex);
1102 down_write(&port->mutex);
1103 }
1104
1105 up_write(&port->mutex);
1106
1107 clear_bit(port->dev_num, dev_map);
1108 }
1109
1110 static void ib_umad_add_one(struct ib_device *device)
1111 {
1112 struct ib_umad_device *umad_dev;
1113 int s, e, i;
1114
1115 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1116 return;
1117
1118 if (device->node_type == RDMA_NODE_IB_SWITCH)
1119 s = e = 0;
1120 else {
1121 s = 1;
1122 e = device->phys_port_cnt;
1123 }
1124
1125 umad_dev = kzalloc(sizeof *umad_dev +
1126 (e - s + 1) * sizeof (struct ib_umad_port),
1127 GFP_KERNEL);
1128 if (!umad_dev)
1129 return;
1130
1131 kref_init(&umad_dev->ref);
1132
1133 umad_dev->start_port = s;
1134 umad_dev->end_port = e;
1135
1136 for (i = s; i <= e; ++i) {
1137 umad_dev->port[i - s].umad_dev = umad_dev;
1138
1139 if (ib_umad_init_port(device, i, &umad_dev->port[i - s]))
1140 goto err;
1141 }
1142
1143 ib_set_client_data(device, &umad_client, umad_dev);
1144
1145 return;
1146
1147 err:
1148 while (--i >= s)
1149 ib_umad_kill_port(&umad_dev->port[i - s]);
1150
1151 kref_put(&umad_dev->ref, ib_umad_release_dev);
1152 }
1153
1154 static void ib_umad_remove_one(struct ib_device *device)
1155 {
1156 struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client);
1157 int i;
1158
1159 if (!umad_dev)
1160 return;
1161
1162 for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i)
1163 ib_umad_kill_port(&umad_dev->port[i]);
1164
1165 kref_put(&umad_dev->ref, ib_umad_release_dev);
1166 }
1167
1168 static int __init ib_umad_init(void)
1169 {
1170 int ret;
1171
1172 ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
1173 "infiniband_mad");
1174 if (ret) {
1175 printk(KERN_ERR "user_mad: couldn't register device number\n");
1176 goto out;
1177 }
1178
1179 umad_class = class_create(THIS_MODULE, "infiniband_mad");
1180 if (IS_ERR(umad_class)) {
1181 ret = PTR_ERR(umad_class);
1182 printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n");
1183 goto out_chrdev;
1184 }
1185
1186 ret = class_create_file(umad_class, &class_attr_abi_version);
1187 if (ret) {
1188 printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n");
1189 goto out_class;
1190 }
1191
1192 ret = ib_register_client(&umad_client);
1193 if (ret) {
1194 printk(KERN_ERR "user_mad: couldn't register ib_umad client\n");
1195 goto out_class;
1196 }
1197
1198 return 0;
1199
1200 out_class:
1201 class_destroy(umad_class);
1202
1203 out_chrdev:
1204 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1205
1206 out:
1207 return ret;
1208 }
1209
1210 static void __exit ib_umad_cleanup(void)
1211 {
1212 ib_unregister_client(&umad_client);
1213 class_destroy(umad_class);
1214 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1215 }
1216
1217 module_init(ib_umad_init);
1218 module_exit(ib_umad_cleanup);
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