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x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / infiniband / core / user_mad.c
blob1acb99100556944ef499b9d3cdc26da30d2f17c5
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/sched.h>
48 #include <linux/semaphore.h>
49 #include <linux/slab.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:
70 * device special file is opened, we take a reference on the
71 * ib_umad_port's struct ib_umad_device. We drop these
72 * references in the corresponding close().
73 *
74 * In addition to references coming from open character devices, there
75 * is one more reference to each ib_umad_device representing the
76 * module's reference taken when allocating the ib_umad_device in
77 * ib_umad_add_one().
78 *
79 * When destroying an ib_umad_device, we drop the module's reference.
80 */
81
82 struct ib_umad_port {
83 struct cdev cdev;
84 struct device *dev;
85
86 struct cdev sm_cdev;
87 struct device *sm_dev;
88 struct semaphore sm_sem;
89
90 struct mutex file_mutex;
91 struct list_head file_list;
92
93 struct ib_device *ib_dev;
94 struct ib_umad_device *umad_dev;
95 int dev_num;
96 u8 port_num;
97 };
98
99 struct ib_umad_device {
100 int start_port, end_port;
101 struct kobject kobj;
102 struct ib_umad_port port[0];
103 };
104
105 struct ib_umad_file {
106 struct mutex mutex;
107 struct ib_umad_port *port;
108 struct list_head recv_list;
109 struct list_head send_list;
110 struct list_head port_list;
111 spinlock_t send_lock;
112 wait_queue_head_t recv_wait;
113 struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS];
114 int agents_dead;
115 u8 use_pkey_index;
116 u8 already_used;
117 };
118
119 struct ib_umad_packet {
120 struct ib_mad_send_buf *msg;
121 struct ib_mad_recv_wc *recv_wc;
122 struct list_head list;
123 int length;
124 struct ib_user_mad mad;
125 };
126
127 static struct class *umad_class;
128
129 static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
130
131 static DEFINE_SPINLOCK(port_lock);
132 static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS);
133
134 static void ib_umad_add_one(struct ib_device *device);
135 static void ib_umad_remove_one(struct ib_device *device);
136
137 static void ib_umad_release_dev(struct kobject *kobj)
138 {
139 struct ib_umad_device *dev =
140 container_of(kobj, struct ib_umad_device, kobj);
141
142 kfree(dev);
143 }
144
145 static struct kobj_type ib_umad_dev_ktype = {
146 .release = ib_umad_release_dev,
147 };
148
149 static int hdr_size(struct ib_umad_file *file)
150 {
151 return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) :
152 sizeof (struct ib_user_mad_hdr_old);
153 }
154
155 /* caller must hold file->mutex */
156 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
157 {
158 return file->agents_dead ? NULL : file->agent[id];
159 }
160
161 static int queue_packet(struct ib_umad_file *file,
162 struct ib_mad_agent *agent,
163 struct ib_umad_packet *packet)
164 {
165 int ret = 1;
166
167 mutex_lock(&file->mutex);
168
169 for (packet->mad.hdr.id = 0;
170 packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
171 packet->mad.hdr.id++)
172 if (agent == __get_agent(file, packet->mad.hdr.id)) {
173 list_add_tail(&packet->list, &file->recv_list);
174 wake_up_interruptible(&file->recv_wait);
175 ret = 0;
176 break;
177 }
178
179 mutex_unlock(&file->mutex);
180
181 return ret;
182 }
183
184 static void dequeue_send(struct ib_umad_file *file,
185 struct ib_umad_packet *packet)
186 {
187 spin_lock_irq(&file->send_lock);
188 list_del(&packet->list);
189 spin_unlock_irq(&file->send_lock);
190 }
191
192 static void send_handler(struct ib_mad_agent *agent,
193 struct ib_mad_send_wc *send_wc)
194 {
195 struct ib_umad_file *file = agent->context;
196 struct ib_umad_packet *packet = send_wc->send_buf->context[0];
197
198 dequeue_send(file, packet);
199 ib_destroy_ah(packet->msg->ah);
200 ib_free_send_mad(packet->msg);
201
202 if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
203 packet->length = IB_MGMT_MAD_HDR;
204 packet->mad.hdr.status = ETIMEDOUT;
205 if (!queue_packet(file, agent, packet))
206 return;
207 }
208 kfree(packet);
209 }
210
211 static void recv_handler(struct ib_mad_agent *agent,
212 struct ib_mad_recv_wc *mad_recv_wc)
213 {
214 struct ib_umad_file *file = agent->context;
215 struct ib_umad_packet *packet;
216
217 if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
218 goto err1;
219
220 packet = kzalloc(sizeof *packet, GFP_KERNEL);
221 if (!packet)
222 goto err1;
223
224 packet->length = mad_recv_wc->mad_len;
225 packet->recv_wc = mad_recv_wc;
226
227 packet->mad.hdr.status = 0;
228 packet->mad.hdr.length = hdr_size(file) + mad_recv_wc->mad_len;
229 packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp);
230 packet->mad.hdr.lid = cpu_to_be16(mad_recv_wc->wc->slid);
231 packet->mad.hdr.sl = mad_recv_wc->wc->sl;
232 packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits;
233 packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;
234 packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
235 if (packet->mad.hdr.grh_present) {
236 struct ib_ah_attr ah_attr;
237
238 ib_init_ah_from_wc(agent->device, agent->port_num,
239 mad_recv_wc->wc, mad_recv_wc->recv_buf.grh,
240 &ah_attr);
241
242 packet->mad.hdr.gid_index = ah_attr.grh.sgid_index;
243 packet->mad.hdr.hop_limit = ah_attr.grh.hop_limit;
244 packet->mad.hdr.traffic_class = ah_attr.grh.traffic_class;
245 memcpy(packet->mad.hdr.gid, &ah_attr.grh.dgid, 16);
246 packet->mad.hdr.flow_label = cpu_to_be32(ah_attr.grh.flow_label);
247 }
248
249 if (queue_packet(file, agent, packet))
250 goto err2;
251 return;
252
253 err2:
254 kfree(packet);
255 err1:
256 ib_free_recv_mad(mad_recv_wc);
257 }
258
259 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
260 struct ib_umad_packet *packet, size_t count)
261 {
262 struct ib_mad_recv_buf *recv_buf;
263 int left, seg_payload, offset, max_seg_payload;
264
265 /* We need enough room to copy the first (or only) MAD segment. */
266 recv_buf = &packet->recv_wc->recv_buf;
267 if ((packet->length <= sizeof (*recv_buf->mad) &&
268 count < hdr_size(file) + packet->length) ||
269 (packet->length > sizeof (*recv_buf->mad) &&
270 count < hdr_size(file) + sizeof (*recv_buf->mad)))
271 return -EINVAL;
272
273 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
274 return -EFAULT;
275
276 buf += hdr_size(file);
277 seg_payload = min_t(int, packet->length, sizeof (*recv_buf->mad));
278 if (copy_to_user(buf, recv_buf->mad, seg_payload))
279 return -EFAULT;
280
281 if (seg_payload < packet->length) {
282 /*
283 * Multipacket RMPP MAD message. Copy remainder of message.
284 * Note that last segment may have a shorter payload.
285 */
286 if (count < hdr_size(file) + packet->length) {
287 /*
288 * The buffer is too small, return the first RMPP segment,
289 * which includes the RMPP message length.
290 */
291 return -ENOSPC;
292 }
293 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
294 max_seg_payload = sizeof (struct ib_mad) - offset;
295
296 for (left = packet->length - seg_payload, buf += seg_payload;
297 left; left -= seg_payload, buf += seg_payload) {
298 recv_buf = container_of(recv_buf->list.next,
299 struct ib_mad_recv_buf, list);
300 seg_payload = min(left, max_seg_payload);
301 if (copy_to_user(buf, ((void *) recv_buf->mad) + offset,
302 seg_payload))
303 return -EFAULT;
304 }
305 }
306 return hdr_size(file) + packet->length;
307 }
308
309 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
310 struct ib_umad_packet *packet, size_t count)
311 {
312 ssize_t size = hdr_size(file) + packet->length;
313
314 if (count < size)
315 return -EINVAL;
316
317 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
318 return -EFAULT;
319
320 buf += hdr_size(file);
321
322 if (copy_to_user(buf, packet->mad.data, packet->length))
323 return -EFAULT;
324
325 return size;
326 }
327
328 static ssize_t ib_umad_read(struct file *filp, char __user *buf,
329 size_t count, loff_t *pos)
330 {
331 struct ib_umad_file *file = filp->private_data;
332 struct ib_umad_packet *packet;
333 ssize_t ret;
334
335 if (count < hdr_size(file))
336 return -EINVAL;
337
338 mutex_lock(&file->mutex);
339
340 while (list_empty(&file->recv_list)) {
341 mutex_unlock(&file->mutex);
342
343 if (filp->f_flags & O_NONBLOCK)
344 return -EAGAIN;
345
346 if (wait_event_interruptible(file->recv_wait,
347 !list_empty(&file->recv_list)))
348 return -ERESTARTSYS;
349
350 mutex_lock(&file->mutex);
351 }
352
353 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
354 list_del(&packet->list);
355
356 mutex_unlock(&file->mutex);
357
358 if (packet->recv_wc)
359 ret = copy_recv_mad(file, buf, packet, count);
360 else
361 ret = copy_send_mad(file, buf, packet, count);
362
363 if (ret < 0) {
364 /* Requeue packet */
365 mutex_lock(&file->mutex);
366 list_add(&packet->list, &file->recv_list);
367 mutex_unlock(&file->mutex);
368 } else {
369 if (packet->recv_wc)
370 ib_free_recv_mad(packet->recv_wc);
371 kfree(packet);
372 }
373 return ret;
374 }
375
376 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
377 {
378 int left, seg;
379
380 /* Copy class specific header */
381 if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
382 copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
383 msg->hdr_len - IB_MGMT_RMPP_HDR))
384 return -EFAULT;
385
386 /* All headers are in place. Copy data segments. */
387 for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
388 seg++, left -= msg->seg_size, buf += msg->seg_size) {
389 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
390 min(left, msg->seg_size)))
391 return -EFAULT;
392 }
393 return 0;
394 }
395
396 static int same_destination(struct ib_user_mad_hdr *hdr1,
397 struct ib_user_mad_hdr *hdr2)
398 {
399 if (!hdr1->grh_present && !hdr2->grh_present)
400 return (hdr1->lid == hdr2->lid);
401
402 if (hdr1->grh_present && hdr2->grh_present)
403 return !memcmp(hdr1->gid, hdr2->gid, 16);
404
405 return 0;
406 }
407
408 static int is_duplicate(struct ib_umad_file *file,
409 struct ib_umad_packet *packet)
410 {
411 struct ib_umad_packet *sent_packet;
412 struct ib_mad_hdr *sent_hdr, *hdr;
413
414 hdr = (struct ib_mad_hdr *) packet->mad.data;
415 list_for_each_entry(sent_packet, &file->send_list, list) {
416 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
417
418 if ((hdr->tid != sent_hdr->tid) ||
419 (hdr->mgmt_class != sent_hdr->mgmt_class))
420 continue;
421
422 /*
423 * No need to be overly clever here. If two new operations have
424 * the same TID, reject the second as a duplicate. This is more
425 * restrictive than required by the spec.
426 */
427 if (!ib_response_mad((struct ib_mad *) hdr)) {
428 if (!ib_response_mad((struct ib_mad *) sent_hdr))
429 return 1;
430 continue;
431 } else if (!ib_response_mad((struct ib_mad *) sent_hdr))
432 continue;
433
434 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
435 return 1;
436 }
437
438 return 0;
439 }
440
441 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
442 size_t count, loff_t *pos)
443 {
444 struct ib_umad_file *file = filp->private_data;
445 struct ib_umad_packet *packet;
446 struct ib_mad_agent *agent;
447 struct ib_ah_attr ah_attr;
448 struct ib_ah *ah;
449 struct ib_rmpp_mad *rmpp_mad;
450 __be64 *tid;
451 int ret, data_len, hdr_len, copy_offset, rmpp_active;
452
453 if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
454 return -EINVAL;
455
456 packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
457 if (!packet)
458 return -ENOMEM;
459
460 if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
461 ret = -EFAULT;
462 goto err;
463 }
464
465 if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
466 ret = -EINVAL;
467 goto err;
468 }
469
470 buf += hdr_size(file);
471
472 if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
473 ret = -EFAULT;
474 goto err;
475 }
476
477 mutex_lock(&file->mutex);
478
479 agent = __get_agent(file, packet->mad.hdr.id);
480 if (!agent) {
481 ret = -EINVAL;
482 goto err_up;
483 }
484
485 memset(&ah_attr, 0, sizeof ah_attr);
486 ah_attr.dlid = be16_to_cpu(packet->mad.hdr.lid);
487 ah_attr.sl = packet->mad.hdr.sl;
488 ah_attr.src_path_bits = packet->mad.hdr.path_bits;
489 ah_attr.port_num = file->port->port_num;
490 if (packet->mad.hdr.grh_present) {
491 ah_attr.ah_flags = IB_AH_GRH;
492 memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16);
493 ah_attr.grh.sgid_index = packet->mad.hdr.gid_index;
494 ah_attr.grh.flow_label = be32_to_cpu(packet->mad.hdr.flow_label);
495 ah_attr.grh.hop_limit = packet->mad.hdr.hop_limit;
496 ah_attr.grh.traffic_class = packet->mad.hdr.traffic_class;
497 }
498
499 ah = ib_create_ah(agent->qp->pd, &ah_attr);
500 if (IS_ERR(ah)) {
501 ret = PTR_ERR(ah);
502 goto err_up;
503 }
504
505 rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
506 hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
507 if (!ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)) {
508 copy_offset = IB_MGMT_MAD_HDR;
509 rmpp_active = 0;
510 } else {
511 copy_offset = IB_MGMT_RMPP_HDR;
512 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
513 IB_MGMT_RMPP_FLAG_ACTIVE;
514 }
515
516 data_len = count - hdr_size(file) - hdr_len;
517 packet->msg = ib_create_send_mad(agent,
518 be32_to_cpu(packet->mad.hdr.qpn),
519 packet->mad.hdr.pkey_index, rmpp_active,
520 hdr_len, data_len, GFP_KERNEL);
521 if (IS_ERR(packet->msg)) {
522 ret = PTR_ERR(packet->msg);
523 goto err_ah;
524 }
525
526 packet->msg->ah = ah;
527 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
528 packet->msg->retries = packet->mad.hdr.retries;
529 packet->msg->context[0] = packet;
530
531 /* Copy MAD header. Any RMPP header is already in place. */
532 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
533
534 if (!rmpp_active) {
535 if (copy_from_user(packet->msg->mad + copy_offset,
536 buf + copy_offset,
537 hdr_len + data_len - copy_offset)) {
538 ret = -EFAULT;
539 goto err_msg;
540 }
541 } else {
542 ret = copy_rmpp_mad(packet->msg, buf);
543 if (ret)
544 goto err_msg;
545 }
546
547 /*
548 * Set the high-order part of the transaction ID to make MADs from
549 * different agents unique, and allow routing responses back to the
550 * original requestor.
551 */
552 if (!ib_response_mad(packet->msg->mad)) {
553 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
554 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
555 (be64_to_cpup(tid) & 0xffffffff));
556 rmpp_mad->mad_hdr.tid = *tid;
557 }
558
559 spin_lock_irq(&file->send_lock);
560 ret = is_duplicate(file, packet);
561 if (!ret)
562 list_add_tail(&packet->list, &file->send_list);
563 spin_unlock_irq(&file->send_lock);
564 if (ret) {
565 ret = -EINVAL;
566 goto err_msg;
567 }
568
569 ret = ib_post_send_mad(packet->msg, NULL);
570 if (ret)
571 goto err_send;
572
573 mutex_unlock(&file->mutex);
574 return count;
575
576 err_send:
577 dequeue_send(file, packet);
578 err_msg:
579 ib_free_send_mad(packet->msg);
580 err_ah:
581 ib_destroy_ah(ah);
582 err_up:
583 mutex_unlock(&file->mutex);
584 err:
585 kfree(packet);
586 return ret;
587 }
588
589 static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
590 {
591 struct ib_umad_file *file = filp->private_data;
592
593 /* we will always be able to post a MAD send */
594 unsigned int mask = POLLOUT | POLLWRNORM;
595
596 poll_wait(filp, &file->recv_wait, wait);
597
598 if (!list_empty(&file->recv_list))
599 mask |= POLLIN | POLLRDNORM;
600
601 return mask;
602 }
603
604 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
605 int compat_method_mask)
606 {
607 struct ib_user_mad_reg_req ureq;
608 struct ib_mad_reg_req req;
609 struct ib_mad_agent *agent = NULL;
610 int agent_id;
611 int ret;
612
613 mutex_lock(&file->port->file_mutex);
614 mutex_lock(&file->mutex);
615
616 if (!file->port->ib_dev) {
617 ret = -EPIPE;
618 goto out;
619 }
620
621 if (copy_from_user(&ureq, arg, sizeof ureq)) {
622 ret = -EFAULT;
623 goto out;
624 }
625
626 if (ureq.qpn != 0 && ureq.qpn != 1) {
627 ret = -EINVAL;
628 goto out;
629 }
630
631 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
632 if (!__get_agent(file, agent_id))
633 goto found;
634
635 ret = -ENOMEM;
636 goto out;
637
638 found:
639 if (ureq.mgmt_class) {
640 req.mgmt_class = ureq.mgmt_class;
641 req.mgmt_class_version = ureq.mgmt_class_version;
642 memcpy(req.oui, ureq.oui, sizeof req.oui);
643
644 if (compat_method_mask) {
645 u32 *umm = (u32 *) ureq.method_mask;
646 int i;
647
648 for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
649 req.method_mask[i] =
650 umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
651 } else
652 memcpy(req.method_mask, ureq.method_mask,
653 sizeof req.method_mask);
654 }
655
656 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
657 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
658 ureq.mgmt_class ? &req : NULL,
659 ureq.rmpp_version,
660 send_handler, recv_handler, file);
661 if (IS_ERR(agent)) {
662 ret = PTR_ERR(agent);
663 agent = NULL;
664 goto out;
665 }
666
667 if (put_user(agent_id,
668 (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
669 ret = -EFAULT;
670 goto out;
671 }
672
673 if (!file->already_used) {
674 file->already_used = 1;
675 if (!file->use_pkey_index) {
676 printk(KERN_WARNING "user_mad: process %s did not enable "
677 "P_Key index support.\n", current->comm);
678 printk(KERN_WARNING "user_mad: Documentation/infiniband/user_mad.txt "
679 "has info on the new ABI.\n");
680 }
681 }
682
683 file->agent[agent_id] = agent;
684 ret = 0;
685
686 out:
687 mutex_unlock(&file->mutex);
688
689 if (ret && agent)
690 ib_unregister_mad_agent(agent);
691
692 mutex_unlock(&file->port->file_mutex);
693
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 mutex_lock(&file->port->file_mutex);
707 mutex_lock(&file->mutex);
708
709 if (id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
710 ret = -EINVAL;
711 goto out;
712 }
713
714 agent = file->agent[id];
715 file->agent[id] = NULL;
716
717 out:
718 mutex_unlock(&file->mutex);
719
720 if (agent)
721 ib_unregister_mad_agent(agent);
722
723 mutex_unlock(&file->port->file_mutex);
724
725 return ret;
726 }
727
728 static long ib_umad_enable_pkey(struct ib_umad_file *file)
729 {
730 int ret = 0;
731
732 mutex_lock(&file->mutex);
733 if (file->already_used)
734 ret = -EINVAL;
735 else
736 file->use_pkey_index = 1;
737 mutex_unlock(&file->mutex);
738
739 return ret;
740 }
741
742 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
743 unsigned long arg)
744 {
745 switch (cmd) {
746 case IB_USER_MAD_REGISTER_AGENT:
747 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
748 case IB_USER_MAD_UNREGISTER_AGENT:
749 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
750 case IB_USER_MAD_ENABLE_PKEY:
751 return ib_umad_enable_pkey(filp->private_data);
752 default:
753 return -ENOIOCTLCMD;
754 }
755 }
756
757 #ifdef CONFIG_COMPAT
758 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
759 unsigned long arg)
760 {
761 switch (cmd) {
762 case IB_USER_MAD_REGISTER_AGENT:
763 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
764 case IB_USER_MAD_UNREGISTER_AGENT:
765 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
766 case IB_USER_MAD_ENABLE_PKEY:
767 return ib_umad_enable_pkey(filp->private_data);
768 default:
769 return -ENOIOCTLCMD;
770 }
771 }
772 #endif
773
774 /*
775 * ib_umad_open() does not need the BKL:
776 *
777 * - the ib_umad_port structures are properly reference counted, and
778 * everything else is purely local to the file being created, so
779 * races against other open calls are not a problem;
780 * - the ioctl method does not affect any global state outside of the
781 * file structure being operated on;
782 */
783 static int ib_umad_open(struct inode *inode, struct file *filp)
784 {
785 struct ib_umad_port *port;
786 struct ib_umad_file *file;
787 int ret = -ENXIO;
788
789 port = container_of(inode->i_cdev, struct ib_umad_port, cdev);
790
791 mutex_lock(&port->file_mutex);
792
793 if (!port->ib_dev)
794 goto out;
795
796 ret = -ENOMEM;
797 file = kzalloc(sizeof *file, GFP_KERNEL);
798 if (!file)
799 goto out;
800
801 mutex_init(&file->mutex);
802 spin_lock_init(&file->send_lock);
803 INIT_LIST_HEAD(&file->recv_list);
804 INIT_LIST_HEAD(&file->send_list);
805 init_waitqueue_head(&file->recv_wait);
806
807 file->port = port;
808 filp->private_data = file;
809
810 list_add_tail(&file->port_list, &port->file_list);
811
812 ret = nonseekable_open(inode, filp);
813 if (ret) {
814 list_del(&file->port_list);
815 kfree(file);
816 goto out;
817 }
818
819 kobject_get(&port->umad_dev->kobj);
820
821 out:
822 mutex_unlock(&port->file_mutex);
823 return ret;
824 }
825
826 static int ib_umad_close(struct inode *inode, struct file *filp)
827 {
828 struct ib_umad_file *file = filp->private_data;
829 struct ib_umad_device *dev = file->port->umad_dev;
830 struct ib_umad_packet *packet, *tmp;
831 int already_dead;
832 int i;
833
834 mutex_lock(&file->port->file_mutex);
835 mutex_lock(&file->mutex);
836
837 already_dead = file->agents_dead;
838 file->agents_dead = 1;
839
840 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
841 if (packet->recv_wc)
842 ib_free_recv_mad(packet->recv_wc);
843 kfree(packet);
844 }
845
846 list_del(&file->port_list);
847
848 mutex_unlock(&file->mutex);
849
850 if (!already_dead)
851 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
852 if (file->agent[i])
853 ib_unregister_mad_agent(file->agent[i]);
854
855 mutex_unlock(&file->port->file_mutex);
856
857 kfree(file);
858 kobject_put(&dev->kobj);
859
860 return 0;
861 }
862
863 static const struct file_operations umad_fops = {
864 .owner = THIS_MODULE,
865 .read = ib_umad_read,
866 .write = ib_umad_write,
867 .poll = ib_umad_poll,
868 .unlocked_ioctl = ib_umad_ioctl,
869 #ifdef CONFIG_COMPAT
870 .compat_ioctl = ib_umad_compat_ioctl,
871 #endif
872 .open = ib_umad_open,
873 .release = ib_umad_close,
874 .llseek = no_llseek,
875 };
876
877 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
878 {
879 struct ib_umad_port *port;
880 struct ib_port_modify props = {
881 .set_port_cap_mask = IB_PORT_SM
882 };
883 int ret;
884
885 port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev);
886
887 if (filp->f_flags & O_NONBLOCK) {
888 if (down_trylock(&port->sm_sem)) {
889 ret = -EAGAIN;
890 goto fail;
891 }
892 } else {
893 if (down_interruptible(&port->sm_sem)) {
894 ret = -ERESTARTSYS;
895 goto fail;
896 }
897 }
898
899 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
900 if (ret)
901 goto err_up_sem;
902
903 filp->private_data = port;
904
905 ret = nonseekable_open(inode, filp);
906 if (ret)
907 goto err_clr_sm_cap;
908
909 kobject_get(&port->umad_dev->kobj);
910
911 return 0;
912
913 err_clr_sm_cap:
914 swap(props.set_port_cap_mask, props.clr_port_cap_mask);
915 ib_modify_port(port->ib_dev, port->port_num, 0, &props);
916
917 err_up_sem:
918 up(&port->sm_sem);
919
920 fail:
921 return ret;
922 }
923
924 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
925 {
926 struct ib_umad_port *port = filp->private_data;
927 struct ib_port_modify props = {
928 .clr_port_cap_mask = IB_PORT_SM
929 };
930 int ret = 0;
931
932 mutex_lock(&port->file_mutex);
933 if (port->ib_dev)
934 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
935 mutex_unlock(&port->file_mutex);
936
937 up(&port->sm_sem);
938
939 kobject_put(&port->umad_dev->kobj);
940
941 return ret;
942 }
943
944 static const struct file_operations umad_sm_fops = {
945 .owner = THIS_MODULE,
946 .open = ib_umad_sm_open,
947 .release = ib_umad_sm_close,
948 .llseek = no_llseek,
949 };
950
951 static struct ib_client umad_client = {
952 .name = "umad",
953 .add = ib_umad_add_one,
954 .remove = ib_umad_remove_one
955 };
956
957 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
958 char *buf)
959 {
960 struct ib_umad_port *port = dev_get_drvdata(dev);
961
962 if (!port)
963 return -ENODEV;
964
965 return sprintf(buf, "%s\n", port->ib_dev->name);
966 }
967 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
968
969 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
970 char *buf)
971 {
972 struct ib_umad_port *port = dev_get_drvdata(dev);
973
974 if (!port)
975 return -ENODEV;
976
977 return sprintf(buf, "%d\n", port->port_num);
978 }
979 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
980
981 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
982 __stringify(IB_USER_MAD_ABI_VERSION));
983
984 static dev_t overflow_maj;
985 static DECLARE_BITMAP(overflow_map, IB_UMAD_MAX_PORTS);
986 static int find_overflow_devnum(void)
987 {
988 int ret;
989
990 if (!overflow_maj) {
991 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UMAD_MAX_PORTS * 2,
992 "infiniband_mad");
993 if (ret) {
994 printk(KERN_ERR "user_mad: couldn't register dynamic device number\n");
995 return ret;
996 }
997 }
998
999 ret = find_first_zero_bit(overflow_map, IB_UMAD_MAX_PORTS);
1000 if (ret >= IB_UMAD_MAX_PORTS)
1001 return -1;
1002
1003 return ret;
1004 }
1005
1006 static int ib_umad_init_port(struct ib_device *device, int port_num,
1007 struct ib_umad_device *umad_dev,
1008 struct ib_umad_port *port)
1009 {
1010 int devnum;
1011 dev_t base;
1012
1013 spin_lock(&port_lock);
1014 devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
1015 if (devnum >= IB_UMAD_MAX_PORTS) {
1016 spin_unlock(&port_lock);
1017 devnum = find_overflow_devnum();
1018 if (devnum < 0)
1019 return -1;
1020
1021 spin_lock(&port_lock);
1022 port->dev_num = devnum + IB_UMAD_MAX_PORTS;
1023 base = devnum + overflow_maj;
1024 set_bit(devnum, overflow_map);
1025 } else {
1026 port->dev_num = devnum;
1027 base = devnum + base_dev;
1028 set_bit(devnum, dev_map);
1029 }
1030 spin_unlock(&port_lock);
1031
1032 port->ib_dev = device;
1033 port->port_num = port_num;
1034 sema_init(&port->sm_sem, 1);
1035 mutex_init(&port->file_mutex);
1036 INIT_LIST_HEAD(&port->file_list);
1037
1038 cdev_init(&port->cdev, &umad_fops);
1039 port->cdev.owner = THIS_MODULE;
1040 port->cdev.kobj.parent = &umad_dev->kobj;
1041 kobject_set_name(&port->cdev.kobj, "umad%d", port->dev_num);
1042 if (cdev_add(&port->cdev, base, 1))
1043 goto err_cdev;
1044
1045 port->dev = device_create(umad_class, device->dma_device,
1046 port->cdev.dev, port,
1047 "umad%d", port->dev_num);
1048 if (IS_ERR(port->dev))
1049 goto err_cdev;
1050
1051 if (device_create_file(port->dev, &dev_attr_ibdev))
1052 goto err_dev;
1053 if (device_create_file(port->dev, &dev_attr_port))
1054 goto err_dev;
1055
1056 base += IB_UMAD_MAX_PORTS;
1057 cdev_init(&port->sm_cdev, &umad_sm_fops);
1058 port->sm_cdev.owner = THIS_MODULE;
1059 port->sm_cdev.kobj.parent = &umad_dev->kobj;
1060 kobject_set_name(&port->sm_cdev.kobj, "issm%d", port->dev_num);
1061 if (cdev_add(&port->sm_cdev, base, 1))
1062 goto err_sm_cdev;
1063
1064 port->sm_dev = device_create(umad_class, device->dma_device,
1065 port->sm_cdev.dev, port,
1066 "issm%d", port->dev_num);
1067 if (IS_ERR(port->sm_dev))
1068 goto err_sm_cdev;
1069
1070 if (device_create_file(port->sm_dev, &dev_attr_ibdev))
1071 goto err_sm_dev;
1072 if (device_create_file(port->sm_dev, &dev_attr_port))
1073 goto err_sm_dev;
1074
1075 return 0;
1076
1077 err_sm_dev:
1078 device_destroy(umad_class, port->sm_cdev.dev);
1079
1080 err_sm_cdev:
1081 cdev_del(&port->sm_cdev);
1082
1083 err_dev:
1084 device_destroy(umad_class, port->cdev.dev);
1085
1086 err_cdev:
1087 cdev_del(&port->cdev);
1088 if (port->dev_num < IB_UMAD_MAX_PORTS)
1089 clear_bit(devnum, dev_map);
1090 else
1091 clear_bit(devnum, overflow_map);
1092
1093 return -1;
1094 }
1095
1096 static void ib_umad_kill_port(struct ib_umad_port *port)
1097 {
1098 struct ib_umad_file *file;
1099 int id;
1100
1101 dev_set_drvdata(port->dev, NULL);
1102 dev_set_drvdata(port->sm_dev, NULL);
1103
1104 device_destroy(umad_class, port->cdev.dev);
1105 device_destroy(umad_class, port->sm_cdev.dev);
1106
1107 cdev_del(&port->cdev);
1108 cdev_del(&port->sm_cdev);
1109
1110 mutex_lock(&port->file_mutex);
1111
1112 port->ib_dev = NULL;
1113
1114 list_for_each_entry(file, &port->file_list, port_list) {
1115 mutex_lock(&file->mutex);
1116 file->agents_dead = 1;
1117 mutex_unlock(&file->mutex);
1118
1119 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1120 if (file->agent[id])
1121 ib_unregister_mad_agent(file->agent[id]);
1122 }
1123
1124 mutex_unlock(&port->file_mutex);
1125
1126 if (port->dev_num < IB_UMAD_MAX_PORTS)
1127 clear_bit(port->dev_num, dev_map);
1128 else
1129 clear_bit(port->dev_num - IB_UMAD_MAX_PORTS, overflow_map);
1130 }
1131
1132 static void ib_umad_add_one(struct ib_device *device)
1133 {
1134 struct ib_umad_device *umad_dev;
1135 int s, e, i;
1136
1137 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1138 return;
1139
1140 if (device->node_type == RDMA_NODE_IB_SWITCH)
1141 s = e = 0;
1142 else {
1143 s = 1;
1144 e = device->phys_port_cnt;
1145 }
1146
1147 umad_dev = kzalloc(sizeof *umad_dev +
1148 (e - s + 1) * sizeof (struct ib_umad_port),
1149 GFP_KERNEL);
1150 if (!umad_dev)
1151 return;
1152
1153 kobject_init(&umad_dev->kobj, &ib_umad_dev_ktype);
1154
1155 umad_dev->start_port = s;
1156 umad_dev->end_port = e;
1157
1158 for (i = s; i <= e; ++i) {
1159 umad_dev->port[i - s].umad_dev = umad_dev;
1160
1161 if (ib_umad_init_port(device, i, umad_dev,
1162 &umad_dev->port[i - s]))
1163 goto err;
1164 }
1165
1166 ib_set_client_data(device, &umad_client, umad_dev);
1167
1168 return;
1169
1170 err:
1171 while (--i >= s)
1172 ib_umad_kill_port(&umad_dev->port[i - s]);
1173
1174 kobject_put(&umad_dev->kobj);
1175 }
1176
1177 static void ib_umad_remove_one(struct ib_device *device)
1178 {
1179 struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client);
1180 int i;
1181
1182 if (!umad_dev)
1183 return;
1184
1185 for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i)
1186 ib_umad_kill_port(&umad_dev->port[i]);
1187
1188 kobject_put(&umad_dev->kobj);
1189 }
1190
1191 static char *umad_devnode(struct device *dev, umode_t *mode)
1192 {
1193 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1194 }
1195
1196 static int __init ib_umad_init(void)
1197 {
1198 int ret;
1199
1200 ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
1201 "infiniband_mad");
1202 if (ret) {
1203 printk(KERN_ERR "user_mad: couldn't register device number\n");
1204 goto out;
1205 }
1206
1207 umad_class = class_create(THIS_MODULE, "infiniband_mad");
1208 if (IS_ERR(umad_class)) {
1209 ret = PTR_ERR(umad_class);
1210 printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n");
1211 goto out_chrdev;
1212 }
1213
1214 umad_class->devnode = umad_devnode;
1215
1216 ret = class_create_file(umad_class, &class_attr_abi_version.attr);
1217 if (ret) {
1218 printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n");
1219 goto out_class;
1220 }
1221
1222 ret = ib_register_client(&umad_client);
1223 if (ret) {
1224 printk(KERN_ERR "user_mad: couldn't register ib_umad client\n");
1225 goto out_class;
1226 }
1227
1228 return 0;
1229
1230 out_class:
1231 class_destroy(umad_class);
1232
1233 out_chrdev:
1234 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1235
1236 out:
1237 return ret;
1238 }
1239
1240 static void __exit ib_umad_cleanup(void)
1241 {
1242 ib_unregister_client(&umad_client);
1243 class_destroy(umad_class);
1244 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1245 if (overflow_maj)
1246 unregister_chrdev_region(overflow_maj, IB_UMAD_MAX_PORTS * 2);
1247 }
1248
1249 module_init(ib_umad_init);
1250 module_exit(ib_umad_cleanup);
Linux with added FPC-III support