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Convert asm/semaphore.h users to linux/semaphore.h
[linux-2.6/mini2440.git] / drivers / infiniband / core / user_mad.c
blobbe953e87bf93f77fed7afc3bbb64262b9d3998c3
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 * $Id: user_mad.c 5596 2006-03-03 01:00:07Z sean.hefty $
36 */
37
38 #include <linux/module.h>
39 #include <linux/init.h>
40 #include <linux/device.h>
41 #include <linux/err.h>
42 #include <linux/fs.h>
43 #include <linux/cdev.h>
44 #include <linux/dma-mapping.h>
45 #include <linux/poll.h>
46 #include <linux/mutex.h>
47 #include <linux/kref.h>
48 #include <linux/compat.h>
49 #include <linux/semaphore.h>
50
51 #include <asm/uaccess.h>
52
53 #include <rdma/ib_mad.h>
54 #include <rdma/ib_user_mad.h>
55
56 MODULE_AUTHOR("Roland Dreier");
57 MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");
58 MODULE_LICENSE("Dual BSD/GPL");
59
60 enum {
61 IB_UMAD_MAX_PORTS = 64,
62 IB_UMAD_MAX_AGENTS = 32,
63
64 IB_UMAD_MAJOR = 231,
65 IB_UMAD_MINOR_BASE = 0
66 };
67
68 /*
69 * Our lifetime rules for these structs are the following: each time a
70 * device special file is opened, we look up the corresponding struct
71 * ib_umad_port by minor in the umad_port[] table while holding the
72 * port_lock. If this lookup succeeds, we take a reference on the
73 * ib_umad_port's struct ib_umad_device while still holding the
74 * port_lock; if the lookup fails, we fail the open(). We drop these
75 * references in the corresponding close().
76 *
77 * In addition to references coming from open character devices, there
78 * is one more reference to each ib_umad_device representing the
79 * module's reference taken when allocating the ib_umad_device in
80 * ib_umad_add_one().
81 *
82 * When destroying an ib_umad_device, we clear all of its
83 * ib_umad_ports from umad_port[] while holding port_lock before
84 * dropping the module's reference to the ib_umad_device. This is
85 * always safe because any open() calls will either succeed and obtain
86 * a reference before we clear the umad_port[] entries, or fail after
87 * we clear the umad_port[] entries.
88 */
89
90 struct ib_umad_port {
91 struct cdev *dev;
92 struct class_device *class_dev;
93
94 struct cdev *sm_dev;
95 struct class_device *sm_class_dev;
96 struct semaphore sm_sem;
97
98 struct mutex file_mutex;
99 struct list_head file_list;
100
101 struct ib_device *ib_dev;
102 struct ib_umad_device *umad_dev;
103 int dev_num;
104 u8 port_num;
105 };
106
107 struct ib_umad_device {
108 int start_port, end_port;
109 struct kref ref;
110 struct ib_umad_port port[0];
111 };
112
113 struct ib_umad_file {
114 struct mutex mutex;
115 struct ib_umad_port *port;
116 struct list_head recv_list;
117 struct list_head send_list;
118 struct list_head port_list;
119 spinlock_t send_lock;
120 wait_queue_head_t recv_wait;
121 struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS];
122 int agents_dead;
123 u8 use_pkey_index;
124 u8 already_used;
125 };
126
127 struct ib_umad_packet {
128 struct ib_mad_send_buf *msg;
129 struct ib_mad_recv_wc *recv_wc;
130 struct list_head list;
131 int length;
132 struct ib_user_mad mad;
133 };
134
135 static struct class *umad_class;
136
137 static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
138
139 static DEFINE_SPINLOCK(port_lock);
140 static struct ib_umad_port *umad_port[IB_UMAD_MAX_PORTS];
141 static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS);
142
143 static void ib_umad_add_one(struct ib_device *device);
144 static void ib_umad_remove_one(struct ib_device *device);
145
146 static void ib_umad_release_dev(struct kref *ref)
147 {
148 struct ib_umad_device *dev =
149 container_of(ref, struct ib_umad_device, ref);
150
151 kfree(dev);
152 }
153
154 static int hdr_size(struct ib_umad_file *file)
155 {
156 return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) :
157 sizeof (struct ib_user_mad_hdr_old);
158 }
159
160 /* caller must hold file->mutex */
161 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
162 {
163 return file->agents_dead ? NULL : file->agent[id];
164 }
165
166 static int queue_packet(struct ib_umad_file *file,
167 struct ib_mad_agent *agent,
168 struct ib_umad_packet *packet)
169 {
170 int ret = 1;
171
172 mutex_lock(&file->mutex);
173
174 for (packet->mad.hdr.id = 0;
175 packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
176 packet->mad.hdr.id++)
177 if (agent == __get_agent(file, packet->mad.hdr.id)) {
178 list_add_tail(&packet->list, &file->recv_list);
179 wake_up_interruptible(&file->recv_wait);
180 ret = 0;
181 break;
182 }
183
184 mutex_unlock(&file->mutex);
185
186 return ret;
187 }
188
189 static void dequeue_send(struct ib_umad_file *file,
190 struct ib_umad_packet *packet)
191 {
192 spin_lock_irq(&file->send_lock);
193 list_del(&packet->list);
194 spin_unlock_irq(&file->send_lock);
195 }
196
197 static void send_handler(struct ib_mad_agent *agent,
198 struct ib_mad_send_wc *send_wc)
199 {
200 struct ib_umad_file *file = agent->context;
201 struct ib_umad_packet *packet = send_wc->send_buf->context[0];
202
203 dequeue_send(file, packet);
204 ib_destroy_ah(packet->msg->ah);
205 ib_free_send_mad(packet->msg);
206
207 if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
208 packet->length = IB_MGMT_MAD_HDR;
209 packet->mad.hdr.status = ETIMEDOUT;
210 if (!queue_packet(file, agent, packet))
211 return;
212 }
213 kfree(packet);
214 }
215
216 static void recv_handler(struct ib_mad_agent *agent,
217 struct ib_mad_recv_wc *mad_recv_wc)
218 {
219 struct ib_umad_file *file = agent->context;
220 struct ib_umad_packet *packet;
221
222 if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
223 goto err1;
224
225 packet = kzalloc(sizeof *packet, GFP_KERNEL);
226 if (!packet)
227 goto err1;
228
229 packet->length = mad_recv_wc->mad_len;
230 packet->recv_wc = mad_recv_wc;
231
232 packet->mad.hdr.status = 0;
233 packet->mad.hdr.length = hdr_size(file) + mad_recv_wc->mad_len;
234 packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp);
235 packet->mad.hdr.lid = cpu_to_be16(mad_recv_wc->wc->slid);
236 packet->mad.hdr.sl = mad_recv_wc->wc->sl;
237 packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits;
238 packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;
239 packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
240 if (packet->mad.hdr.grh_present) {
241 struct ib_ah_attr ah_attr;
242
243 ib_init_ah_from_wc(agent->device, agent->port_num,
244 mad_recv_wc->wc, mad_recv_wc->recv_buf.grh,
245 &ah_attr);
246
247 packet->mad.hdr.gid_index = ah_attr.grh.sgid_index;
248 packet->mad.hdr.hop_limit = ah_attr.grh.hop_limit;
249 packet->mad.hdr.traffic_class = ah_attr.grh.traffic_class;
250 memcpy(packet->mad.hdr.gid, &ah_attr.grh.dgid, 16);
251 packet->mad.hdr.flow_label = cpu_to_be32(ah_attr.grh.flow_label);
252 }
253
254 if (queue_packet(file, agent, packet))
255 goto err2;
256 return;
257
258 err2:
259 kfree(packet);
260 err1:
261 ib_free_recv_mad(mad_recv_wc);
262 }
263
264 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
265 struct ib_umad_packet *packet, size_t count)
266 {
267 struct ib_mad_recv_buf *recv_buf;
268 int left, seg_payload, offset, max_seg_payload;
269
270 /* We need enough room to copy the first (or only) MAD segment. */
271 recv_buf = &packet->recv_wc->recv_buf;
272 if ((packet->length <= sizeof (*recv_buf->mad) &&
273 count < hdr_size(file) + packet->length) ||
274 (packet->length > sizeof (*recv_buf->mad) &&
275 count < hdr_size(file) + sizeof (*recv_buf->mad)))
276 return -EINVAL;
277
278 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
279 return -EFAULT;
280
281 buf += hdr_size(file);
282 seg_payload = min_t(int, packet->length, sizeof (*recv_buf->mad));
283 if (copy_to_user(buf, recv_buf->mad, seg_payload))
284 return -EFAULT;
285
286 if (seg_payload < packet->length) {
287 /*
288 * Multipacket RMPP MAD message. Copy remainder of message.
289 * Note that last segment may have a shorter payload.
290 */
291 if (count < hdr_size(file) + packet->length) {
292 /*
293 * The buffer is too small, return the first RMPP segment,
294 * which includes the RMPP message length.
295 */
296 return -ENOSPC;
297 }
298 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
299 max_seg_payload = sizeof (struct ib_mad) - offset;
300
301 for (left = packet->length - seg_payload, buf += seg_payload;
302 left; left -= seg_payload, buf += seg_payload) {
303 recv_buf = container_of(recv_buf->list.next,
304 struct ib_mad_recv_buf, list);
305 seg_payload = min(left, max_seg_payload);
306 if (copy_to_user(buf, ((void *) recv_buf->mad) + offset,
307 seg_payload))
308 return -EFAULT;
309 }
310 }
311 return hdr_size(file) + packet->length;
312 }
313
314 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
315 struct ib_umad_packet *packet, size_t count)
316 {
317 ssize_t size = hdr_size(file) + packet->length;
318
319 if (count < size)
320 return -EINVAL;
321
322 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
323 return -EFAULT;
324
325 buf += hdr_size(file);
326
327 if (copy_to_user(buf, packet->mad.data, packet->length))
328 return -EFAULT;
329
330 return size;
331 }
332
333 static ssize_t ib_umad_read(struct file *filp, char __user *buf,
334 size_t count, loff_t *pos)
335 {
336 struct ib_umad_file *file = filp->private_data;
337 struct ib_umad_packet *packet;
338 ssize_t ret;
339
340 if (count < hdr_size(file))
341 return -EINVAL;
342
343 mutex_lock(&file->mutex);
344
345 while (list_empty(&file->recv_list)) {
346 mutex_unlock(&file->mutex);
347
348 if (filp->f_flags & O_NONBLOCK)
349 return -EAGAIN;
350
351 if (wait_event_interruptible(file->recv_wait,
352 !list_empty(&file->recv_list)))
353 return -ERESTARTSYS;
354
355 mutex_lock(&file->mutex);
356 }
357
358 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
359 list_del(&packet->list);
360
361 mutex_unlock(&file->mutex);
362
363 if (packet->recv_wc)
364 ret = copy_recv_mad(file, buf, packet, count);
365 else
366 ret = copy_send_mad(file, buf, packet, count);
367
368 if (ret < 0) {
369 /* Requeue packet */
370 mutex_lock(&file->mutex);
371 list_add(&packet->list, &file->recv_list);
372 mutex_unlock(&file->mutex);
373 } else {
374 if (packet->recv_wc)
375 ib_free_recv_mad(packet->recv_wc);
376 kfree(packet);
377 }
378 return ret;
379 }
380
381 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
382 {
383 int left, seg;
384
385 /* Copy class specific header */
386 if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
387 copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
388 msg->hdr_len - IB_MGMT_RMPP_HDR))
389 return -EFAULT;
390
391 /* All headers are in place. Copy data segments. */
392 for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
393 seg++, left -= msg->seg_size, buf += msg->seg_size) {
394 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
395 min(left, msg->seg_size)))
396 return -EFAULT;
397 }
398 return 0;
399 }
400
401 static int same_destination(struct ib_user_mad_hdr *hdr1,
402 struct ib_user_mad_hdr *hdr2)
403 {
404 if (!hdr1->grh_present && !hdr2->grh_present)
405 return (hdr1->lid == hdr2->lid);
406
407 if (hdr1->grh_present && hdr2->grh_present)
408 return !memcmp(hdr1->gid, hdr2->gid, 16);
409
410 return 0;
411 }
412
413 static int is_duplicate(struct ib_umad_file *file,
414 struct ib_umad_packet *packet)
415 {
416 struct ib_umad_packet *sent_packet;
417 struct ib_mad_hdr *sent_hdr, *hdr;
418
419 hdr = (struct ib_mad_hdr *) packet->mad.data;
420 list_for_each_entry(sent_packet, &file->send_list, list) {
421 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
422
423 if ((hdr->tid != sent_hdr->tid) ||
424 (hdr->mgmt_class != sent_hdr->mgmt_class))
425 continue;
426
427 /*
428 * No need to be overly clever here. If two new operations have
429 * the same TID, reject the second as a duplicate. This is more
430 * restrictive than required by the spec.
431 */
432 if (!ib_response_mad((struct ib_mad *) hdr)) {
433 if (!ib_response_mad((struct ib_mad *) sent_hdr))
434 return 1;
435 continue;
436 } else if (!ib_response_mad((struct ib_mad *) sent_hdr))
437 continue;
438
439 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
440 return 1;
441 }
442
443 return 0;
444 }
445
446 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
447 size_t count, loff_t *pos)
448 {
449 struct ib_umad_file *file = filp->private_data;
450 struct ib_umad_packet *packet;
451 struct ib_mad_agent *agent;
452 struct ib_ah_attr ah_attr;
453 struct ib_ah *ah;
454 struct ib_rmpp_mad *rmpp_mad;
455 __be64 *tid;
456 int ret, data_len, hdr_len, copy_offset, rmpp_active;
457
458 if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
459 return -EINVAL;
460
461 packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
462 if (!packet)
463 return -ENOMEM;
464
465 if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
466 ret = -EFAULT;
467 goto err;
468 }
469
470 if (packet->mad.hdr.id < 0 ||
471 packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
472 ret = -EINVAL;
473 goto err;
474 }
475
476 buf += hdr_size(file);
477
478 if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
479 ret = -EFAULT;
480 goto err;
481 }
482
483 mutex_lock(&file->mutex);
484
485 agent = __get_agent(file, packet->mad.hdr.id);
486 if (!agent) {
487 ret = -EINVAL;
488 goto err_up;
489 }
490
491 memset(&ah_attr, 0, sizeof ah_attr);
492 ah_attr.dlid = be16_to_cpu(packet->mad.hdr.lid);
493 ah_attr.sl = packet->mad.hdr.sl;
494 ah_attr.src_path_bits = packet->mad.hdr.path_bits;
495 ah_attr.port_num = file->port->port_num;
496 if (packet->mad.hdr.grh_present) {
497 ah_attr.ah_flags = IB_AH_GRH;
498 memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16);
499 ah_attr.grh.sgid_index = packet->mad.hdr.gid_index;
500 ah_attr.grh.flow_label = be32_to_cpu(packet->mad.hdr.flow_label);
501 ah_attr.grh.hop_limit = packet->mad.hdr.hop_limit;
502 ah_attr.grh.traffic_class = packet->mad.hdr.traffic_class;
503 }
504
505 ah = ib_create_ah(agent->qp->pd, &ah_attr);
506 if (IS_ERR(ah)) {
507 ret = PTR_ERR(ah);
508 goto err_up;
509 }
510
511 rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
512 hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
513 if (!ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)) {
514 copy_offset = IB_MGMT_MAD_HDR;
515 rmpp_active = 0;
516 } else {
517 copy_offset = IB_MGMT_RMPP_HDR;
518 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
519 IB_MGMT_RMPP_FLAG_ACTIVE;
520 }
521
522 data_len = count - hdr_size(file) - hdr_len;
523 packet->msg = ib_create_send_mad(agent,
524 be32_to_cpu(packet->mad.hdr.qpn),
525 packet->mad.hdr.pkey_index, rmpp_active,
526 hdr_len, data_len, GFP_KERNEL);
527 if (IS_ERR(packet->msg)) {
528 ret = PTR_ERR(packet->msg);
529 goto err_ah;
530 }
531
532 packet->msg->ah = ah;
533 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
534 packet->msg->retries = packet->mad.hdr.retries;
535 packet->msg->context[0] = packet;
536
537 /* Copy MAD header. Any RMPP header is already in place. */
538 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
539
540 if (!rmpp_active) {
541 if (copy_from_user(packet->msg->mad + copy_offset,
542 buf + copy_offset,
543 hdr_len + data_len - copy_offset)) {
544 ret = -EFAULT;
545 goto err_msg;
546 }
547 } else {
548 ret = copy_rmpp_mad(packet->msg, buf);
549 if (ret)
550 goto err_msg;
551 }
552
553 /*
554 * Set the high-order part of the transaction ID to make MADs from
555 * different agents unique, and allow routing responses back to the
556 * original requestor.
557 */
558 if (!ib_response_mad(packet->msg->mad)) {
559 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
560 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
561 (be64_to_cpup(tid) & 0xffffffff));
562 rmpp_mad->mad_hdr.tid = *tid;
563 }
564
565 spin_lock_irq(&file->send_lock);
566 ret = is_duplicate(file, packet);
567 if (!ret)
568 list_add_tail(&packet->list, &file->send_list);
569 spin_unlock_irq(&file->send_lock);
570 if (ret) {
571 ret = -EINVAL;
572 goto err_msg;
573 }
574
575 ret = ib_post_send_mad(packet->msg, NULL);
576 if (ret)
577 goto err_send;
578
579 mutex_unlock(&file->mutex);
580 return count;
581
582 err_send:
583 dequeue_send(file, packet);
584 err_msg:
585 ib_free_send_mad(packet->msg);
586 err_ah:
587 ib_destroy_ah(ah);
588 err_up:
589 mutex_unlock(&file->mutex);
590 err:
591 kfree(packet);
592 return ret;
593 }
594
595 static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
596 {
597 struct ib_umad_file *file = filp->private_data;
598
599 /* we will always be able to post a MAD send */
600 unsigned int mask = POLLOUT | POLLWRNORM;
601
602 poll_wait(filp, &file->recv_wait, wait);
603
604 if (!list_empty(&file->recv_list))
605 mask |= POLLIN | POLLRDNORM;
606
607 return mask;
608 }
609
610 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
611 int compat_method_mask)
612 {
613 struct ib_user_mad_reg_req ureq;
614 struct ib_mad_reg_req req;
615 struct ib_mad_agent *agent = NULL;
616 int agent_id;
617 int ret;
618
619 mutex_lock(&file->port->file_mutex);
620 mutex_lock(&file->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 agent = NULL;
670 goto out;
671 }
672
673 if (put_user(agent_id,
674 (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
675 ret = -EFAULT;
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 mutex_unlock(&file->mutex);
694
695 if (ret && agent)
696 ib_unregister_mad_agent(agent);
697
698 mutex_unlock(&file->port->file_mutex);
699
700 return ret;
701 }
702
703 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
704 {
705 struct ib_mad_agent *agent = NULL;
706 u32 id;
707 int ret = 0;
708
709 if (get_user(id, arg))
710 return -EFAULT;
711
712 mutex_lock(&file->port->file_mutex);
713 mutex_lock(&file->mutex);
714
715 if (id < 0 || id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
716 ret = -EINVAL;
717 goto out;
718 }
719
720 agent = file->agent[id];
721 file->agent[id] = NULL;
722
723 out:
724 mutex_unlock(&file->mutex);
725
726 if (agent)
727 ib_unregister_mad_agent(agent);
728
729 mutex_unlock(&file->port->file_mutex);
730
731 return ret;
732 }
733
734 static long ib_umad_enable_pkey(struct ib_umad_file *file)
735 {
736 int ret = 0;
737
738 mutex_lock(&file->mutex);
739 if (file->already_used)
740 ret = -EINVAL;
741 else
742 file->use_pkey_index = 1;
743 mutex_unlock(&file->mutex);
744
745 return ret;
746 }
747
748 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
749 unsigned long arg)
750 {
751 switch (cmd) {
752 case IB_USER_MAD_REGISTER_AGENT:
753 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
754 case IB_USER_MAD_UNREGISTER_AGENT:
755 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
756 case IB_USER_MAD_ENABLE_PKEY:
757 return ib_umad_enable_pkey(filp->private_data);
758 default:
759 return -ENOIOCTLCMD;
760 }
761 }
762
763 #ifdef CONFIG_COMPAT
764 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
765 unsigned long arg)
766 {
767 switch (cmd) {
768 case IB_USER_MAD_REGISTER_AGENT:
769 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
770 case IB_USER_MAD_UNREGISTER_AGENT:
771 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
772 case IB_USER_MAD_ENABLE_PKEY:
773 return ib_umad_enable_pkey(filp->private_data);
774 default:
775 return -ENOIOCTLCMD;
776 }
777 }
778 #endif
779
780 static int ib_umad_open(struct inode *inode, struct file *filp)
781 {
782 struct ib_umad_port *port;
783 struct ib_umad_file *file;
784 int ret = 0;
785
786 spin_lock(&port_lock);
787 port = umad_port[iminor(inode) - IB_UMAD_MINOR_BASE];
788 if (port)
789 kref_get(&port->umad_dev->ref);
790 spin_unlock(&port_lock);
791
792 if (!port)
793 return -ENXIO;
794
795 mutex_lock(&port->file_mutex);
796
797 if (!port->ib_dev) {
798 ret = -ENXIO;
799 goto out;
800 }
801
802 file = kzalloc(sizeof *file, GFP_KERNEL);
803 if (!file) {
804 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
805 ret = -ENOMEM;
806 goto out;
807 }
808
809 mutex_init(&file->mutex);
810 spin_lock_init(&file->send_lock);
811 INIT_LIST_HEAD(&file->recv_list);
812 INIT_LIST_HEAD(&file->send_list);
813 init_waitqueue_head(&file->recv_wait);
814
815 file->port = port;
816 filp->private_data = file;
817
818 list_add_tail(&file->port_list, &port->file_list);
819
820 out:
821 mutex_unlock(&port->file_mutex);
822 return ret;
823 }
824
825 static int ib_umad_close(struct inode *inode, struct file *filp)
826 {
827 struct ib_umad_file *file = filp->private_data;
828 struct ib_umad_device *dev = file->port->umad_dev;
829 struct ib_umad_packet *packet, *tmp;
830 int already_dead;
831 int i;
832
833 mutex_lock(&file->port->file_mutex);
834 mutex_lock(&file->mutex);
835
836 already_dead = file->agents_dead;
837 file->agents_dead = 1;
838
839 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
840 if (packet->recv_wc)
841 ib_free_recv_mad(packet->recv_wc);
842 kfree(packet);
843 }
844
845 list_del(&file->port_list);
846
847 mutex_unlock(&file->mutex);
848
849 if (!already_dead)
850 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
851 if (file->agent[i])
852 ib_unregister_mad_agent(file->agent[i]);
853
854 mutex_unlock(&file->port->file_mutex);
855
856 kfree(file);
857 kref_put(&dev->ref, ib_umad_release_dev);
858
859 return 0;
860 }
861
862 static const struct file_operations umad_fops = {
863 .owner = THIS_MODULE,
864 .read = ib_umad_read,
865 .write = ib_umad_write,
866 .poll = ib_umad_poll,
867 .unlocked_ioctl = ib_umad_ioctl,
868 #ifdef CONFIG_COMPAT
869 .compat_ioctl = ib_umad_compat_ioctl,
870 #endif
871 .open = ib_umad_open,
872 .release = ib_umad_close
873 };
874
875 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
876 {
877 struct ib_umad_port *port;
878 struct ib_port_modify props = {
879 .set_port_cap_mask = IB_PORT_SM
880 };
881 int ret;
882
883 spin_lock(&port_lock);
884 port = umad_port[iminor(inode) - IB_UMAD_MINOR_BASE - IB_UMAD_MAX_PORTS];
885 if (port)
886 kref_get(&port->umad_dev->ref);
887 spin_unlock(&port_lock);
888
889 if (!port)
890 return -ENXIO;
891
892 if (filp->f_flags & O_NONBLOCK) {
893 if (down_trylock(&port->sm_sem)) {
894 ret = -EAGAIN;
895 goto fail;
896 }
897 } else {
898 if (down_interruptible(&port->sm_sem)) {
899 ret = -ERESTARTSYS;
900 goto fail;
901 }
902 }
903
904 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
905 if (ret) {
906 up(&port->sm_sem);
907 goto fail;
908 }
909
910 filp->private_data = port;
911
912 return 0;
913
914 fail:
915 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
916 return ret;
917 }
918
919 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
920 {
921 struct ib_umad_port *port = filp->private_data;
922 struct ib_port_modify props = {
923 .clr_port_cap_mask = IB_PORT_SM
924 };
925 int ret = 0;
926
927 mutex_lock(&port->file_mutex);
928 if (port->ib_dev)
929 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
930 mutex_unlock(&port->file_mutex);
931
932 up(&port->sm_sem);
933
934 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
935
936 return ret;
937 }
938
939 static const struct file_operations umad_sm_fops = {
940 .owner = THIS_MODULE,
941 .open = ib_umad_sm_open,
942 .release = ib_umad_sm_close
943 };
944
945 static struct ib_client umad_client = {
946 .name = "umad",
947 .add = ib_umad_add_one,
948 .remove = ib_umad_remove_one
949 };
950
951 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
952 {
953 struct ib_umad_port *port = class_get_devdata(class_dev);
954
955 if (!port)
956 return -ENODEV;
957
958 return sprintf(buf, "%s\n", port->ib_dev->name);
959 }
960 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
961
962 static ssize_t show_port(struct class_device *class_dev, char *buf)
963 {
964 struct ib_umad_port *port = class_get_devdata(class_dev);
965
966 if (!port)
967 return -ENODEV;
968
969 return sprintf(buf, "%d\n", port->port_num);
970 }
971 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
972
973 static ssize_t show_abi_version(struct class *class, char *buf)
974 {
975 return sprintf(buf, "%d\n", IB_USER_MAD_ABI_VERSION);
976 }
977 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
978
979 static int ib_umad_init_port(struct ib_device *device, int port_num,
980 struct ib_umad_port *port)
981 {
982 spin_lock(&port_lock);
983 port->dev_num = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
984 if (port->dev_num >= IB_UMAD_MAX_PORTS) {
985 spin_unlock(&port_lock);
986 return -1;
987 }
988 set_bit(port->dev_num, dev_map);
989 spin_unlock(&port_lock);
990
991 port->ib_dev = device;
992 port->port_num = port_num;
993 init_MUTEX(&port->sm_sem);
994 mutex_init(&port->file_mutex);
995 INIT_LIST_HEAD(&port->file_list);
996
997 port->dev = cdev_alloc();
998 if (!port->dev)
999 return -1;
1000 port->dev->owner = THIS_MODULE;
1001 port->dev->ops = &umad_fops;
1002 kobject_set_name(&port->dev->kobj, "umad%d", port->dev_num);
1003 if (cdev_add(port->dev, base_dev + port->dev_num, 1))
1004 goto err_cdev;
1005
1006 port->class_dev = class_device_create(umad_class, NULL, port->dev->dev,
1007 device->dma_device,
1008 "umad%d", port->dev_num);
1009 if (IS_ERR(port->class_dev))
1010 goto err_cdev;
1011
1012 if (class_device_create_file(port->class_dev, &class_device_attr_ibdev))
1013 goto err_class;
1014 if (class_device_create_file(port->class_dev, &class_device_attr_port))
1015 goto err_class;
1016
1017 port->sm_dev = cdev_alloc();
1018 if (!port->sm_dev)
1019 goto err_class;
1020 port->sm_dev->owner = THIS_MODULE;
1021 port->sm_dev->ops = &umad_sm_fops;
1022 kobject_set_name(&port->sm_dev->kobj, "issm%d", port->dev_num);
1023 if (cdev_add(port->sm_dev, base_dev + port->dev_num + IB_UMAD_MAX_PORTS, 1))
1024 goto err_sm_cdev;
1025
1026 port->sm_class_dev = class_device_create(umad_class, NULL, port->sm_dev->dev,
1027 device->dma_device,
1028 "issm%d", port->dev_num);
1029 if (IS_ERR(port->sm_class_dev))
1030 goto err_sm_cdev;
1031
1032 class_set_devdata(port->class_dev, port);
1033 class_set_devdata(port->sm_class_dev, port);
1034
1035 if (class_device_create_file(port->sm_class_dev, &class_device_attr_ibdev))
1036 goto err_sm_class;
1037 if (class_device_create_file(port->sm_class_dev, &class_device_attr_port))
1038 goto err_sm_class;
1039
1040 spin_lock(&port_lock);
1041 umad_port[port->dev_num] = port;
1042 spin_unlock(&port_lock);
1043
1044 return 0;
1045
1046 err_sm_class:
1047 class_device_destroy(umad_class, port->sm_dev->dev);
1048
1049 err_sm_cdev:
1050 cdev_del(port->sm_dev);
1051
1052 err_class:
1053 class_device_destroy(umad_class, port->dev->dev);
1054
1055 err_cdev:
1056 cdev_del(port->dev);
1057 clear_bit(port->dev_num, dev_map);
1058
1059 return -1;
1060 }
1061
1062 static void ib_umad_kill_port(struct ib_umad_port *port)
1063 {
1064 struct ib_umad_file *file;
1065 int already_dead;
1066 int id;
1067
1068 class_set_devdata(port->class_dev, NULL);
1069 class_set_devdata(port->sm_class_dev, NULL);
1070
1071 class_device_destroy(umad_class, port->dev->dev);
1072 class_device_destroy(umad_class, port->sm_dev->dev);
1073
1074 cdev_del(port->dev);
1075 cdev_del(port->sm_dev);
1076
1077 spin_lock(&port_lock);
1078 umad_port[port->dev_num] = NULL;
1079 spin_unlock(&port_lock);
1080
1081 mutex_lock(&port->file_mutex);
1082
1083 port->ib_dev = NULL;
1084
1085 list_for_each_entry(file, &port->file_list, port_list) {
1086 mutex_lock(&file->mutex);
1087 already_dead = file->agents_dead;
1088 file->agents_dead = 1;
1089 mutex_unlock(&file->mutex);
1090
1091 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1092 if (file->agent[id])
1093 ib_unregister_mad_agent(file->agent[id]);
1094 }
1095
1096 mutex_unlock(&port->file_mutex);
1097
1098 clear_bit(port->dev_num, dev_map);
1099 }
1100
1101 static void ib_umad_add_one(struct ib_device *device)
1102 {
1103 struct ib_umad_device *umad_dev;
1104 int s, e, i;
1105
1106 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1107 return;
1108
1109 if (device->node_type == RDMA_NODE_IB_SWITCH)
1110 s = e = 0;
1111 else {
1112 s = 1;
1113 e = device->phys_port_cnt;
1114 }
1115
1116 umad_dev = kzalloc(sizeof *umad_dev +
1117 (e - s + 1) * sizeof (struct ib_umad_port),
1118 GFP_KERNEL);
1119 if (!umad_dev)
1120 return;
1121
1122 kref_init(&umad_dev->ref);
1123
1124 umad_dev->start_port = s;
1125 umad_dev->end_port = e;
1126
1127 for (i = s; i <= e; ++i) {
1128 umad_dev->port[i - s].umad_dev = umad_dev;
1129
1130 if (ib_umad_init_port(device, i, &umad_dev->port[i - s]))
1131 goto err;
1132 }
1133
1134 ib_set_client_data(device, &umad_client, umad_dev);
1135
1136 return;
1137
1138 err:
1139 while (--i >= s)
1140 ib_umad_kill_port(&umad_dev->port[i - s]);
1141
1142 kref_put(&umad_dev->ref, ib_umad_release_dev);
1143 }
1144
1145 static void ib_umad_remove_one(struct ib_device *device)
1146 {
1147 struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client);
1148 int i;
1149
1150 if (!umad_dev)
1151 return;
1152
1153 for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i)
1154 ib_umad_kill_port(&umad_dev->port[i]);
1155
1156 kref_put(&umad_dev->ref, ib_umad_release_dev);
1157 }
1158
1159 static int __init ib_umad_init(void)
1160 {
1161 int ret;
1162
1163 ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
1164 "infiniband_mad");
1165 if (ret) {
1166 printk(KERN_ERR "user_mad: couldn't register device number\n");
1167 goto out;
1168 }
1169
1170 umad_class = class_create(THIS_MODULE, "infiniband_mad");
1171 if (IS_ERR(umad_class)) {
1172 ret = PTR_ERR(umad_class);
1173 printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n");
1174 goto out_chrdev;
1175 }
1176
1177 ret = class_create_file(umad_class, &class_attr_abi_version);
1178 if (ret) {
1179 printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n");
1180 goto out_class;
1181 }
1182
1183 ret = ib_register_client(&umad_client);
1184 if (ret) {
1185 printk(KERN_ERR "user_mad: couldn't register ib_umad client\n");
1186 goto out_class;
1187 }
1188
1189 return 0;
1190
1191 out_class:
1192 class_destroy(umad_class);
1193
1194 out_chrdev:
1195 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1196
1197 out:
1198 return ret;
1199 }
1200
1201 static void __exit ib_umad_cleanup(void)
1202 {
1203 ib_unregister_client(&umad_client);
1204 class_destroy(umad_class);
1205 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1206 }
1207
1208 module_init(ib_umad_init);
1209 module_exit(ib_umad_cleanup);
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