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Linux 2.6.21
[linux/fpc-iii.git] / drivers / infiniband / core / user_mad.c
blobc069ebeba8e33c18746459830b05c61d8469bd45
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/pci.h>
44 #include <linux/dma-mapping.h>
45 #include <linux/poll.h>
46 #include <linux/rwsem.h>
47 #include <linux/kref.h>
48
49 #include <asm/uaccess.h>
50 #include <asm/semaphore.h>
51
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 };
123
124 struct ib_umad_packet {
125 struct ib_mad_send_buf *msg;
126 struct ib_mad_recv_wc *recv_wc;
127 struct list_head list;
128 int length;
129 struct ib_user_mad mad;
130 };
131
132 static struct class *umad_class;
133
134 static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
135
136 static DEFINE_SPINLOCK(port_lock);
137 static struct ib_umad_port *umad_port[IB_UMAD_MAX_PORTS];
138 static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS * 2);
139
140 static void ib_umad_add_one(struct ib_device *device);
141 static void ib_umad_remove_one(struct ib_device *device);
142
143 static void ib_umad_release_dev(struct kref *ref)
144 {
145 struct ib_umad_device *dev =
146 container_of(ref, struct ib_umad_device, ref);
147
148 kfree(dev);
149 }
150
151 /* caller must hold port->mutex at least for reading */
152 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
153 {
154 return file->agents_dead ? NULL : file->agent[id];
155 }
156
157 static int queue_packet(struct ib_umad_file *file,
158 struct ib_mad_agent *agent,
159 struct ib_umad_packet *packet)
160 {
161 int ret = 1;
162
163 down_read(&file->port->mutex);
164
165 for (packet->mad.hdr.id = 0;
166 packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
167 packet->mad.hdr.id++)
168 if (agent == __get_agent(file, packet->mad.hdr.id)) {
169 spin_lock_irq(&file->recv_lock);
170 list_add_tail(&packet->list, &file->recv_list);
171 spin_unlock_irq(&file->recv_lock);
172 wake_up_interruptible(&file->recv_wait);
173 ret = 0;
174 break;
175 }
176
177 up_read(&file->port->mutex);
178
179 return ret;
180 }
181
182 static void dequeue_send(struct ib_umad_file *file,
183 struct ib_umad_packet *packet)
184 {
185 spin_lock_irq(&file->send_lock);
186 list_del(&packet->list);
187 spin_unlock_irq(&file->send_lock);
188 }
189
190 static void send_handler(struct ib_mad_agent *agent,
191 struct ib_mad_send_wc *send_wc)
192 {
193 struct ib_umad_file *file = agent->context;
194 struct ib_umad_packet *packet = send_wc->send_buf->context[0];
195
196 dequeue_send(file, packet);
197 ib_destroy_ah(packet->msg->ah);
198 ib_free_send_mad(packet->msg);
199
200 if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
201 packet->length = IB_MGMT_MAD_HDR;
202 packet->mad.hdr.status = ETIMEDOUT;
203 if (!queue_packet(file, agent, packet))
204 return;
205 }
206 kfree(packet);
207 }
208
209 static void recv_handler(struct ib_mad_agent *agent,
210 struct ib_mad_recv_wc *mad_recv_wc)
211 {
212 struct ib_umad_file *file = agent->context;
213 struct ib_umad_packet *packet;
214
215 if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
216 goto err1;
217
218 packet = kzalloc(sizeof *packet, GFP_KERNEL);
219 if (!packet)
220 goto err1;
221
222 packet->length = mad_recv_wc->mad_len;
223 packet->recv_wc = mad_recv_wc;
224
225 packet->mad.hdr.status = 0;
226 packet->mad.hdr.length = sizeof (struct ib_user_mad) +
227 mad_recv_wc->mad_len;
228 packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp);
229 packet->mad.hdr.lid = cpu_to_be16(mad_recv_wc->wc->slid);
230 packet->mad.hdr.sl = mad_recv_wc->wc->sl;
231 packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits;
232 packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
233 if (packet->mad.hdr.grh_present) {
234 /* XXX parse GRH */
235 packet->mad.hdr.gid_index = 0;
236 packet->mad.hdr.hop_limit = 0;
237 packet->mad.hdr.traffic_class = 0;
238 memset(packet->mad.hdr.gid, 0, 16);
239 packet->mad.hdr.flow_label = 0;
240 }
241
242 if (queue_packet(file, agent, packet))
243 goto err2;
244 return;
245
246 err2:
247 kfree(packet);
248 err1:
249 ib_free_recv_mad(mad_recv_wc);
250 }
251
252 static ssize_t copy_recv_mad(char __user *buf, struct ib_umad_packet *packet,
253 size_t count)
254 {
255 struct ib_mad_recv_buf *recv_buf;
256 int left, seg_payload, offset, max_seg_payload;
257
258 /* We need enough room to copy the first (or only) MAD segment. */
259 recv_buf = &packet->recv_wc->recv_buf;
260 if ((packet->length <= sizeof (*recv_buf->mad) &&
261 count < sizeof (packet->mad) + packet->length) ||
262 (packet->length > sizeof (*recv_buf->mad) &&
263 count < sizeof (packet->mad) + sizeof (*recv_buf->mad)))
264 return -EINVAL;
265
266 if (copy_to_user(buf, &packet->mad, sizeof (packet->mad)))
267 return -EFAULT;
268
269 buf += sizeof (packet->mad);
270 seg_payload = min_t(int, packet->length, sizeof (*recv_buf->mad));
271 if (copy_to_user(buf, recv_buf->mad, seg_payload))
272 return -EFAULT;
273
274 if (seg_payload < packet->length) {
275 /*
276 * Multipacket RMPP MAD message. Copy remainder of message.
277 * Note that last segment may have a shorter payload.
278 */
279 if (count < sizeof (packet->mad) + packet->length) {
280 /*
281 * The buffer is too small, return the first RMPP segment,
282 * which includes the RMPP message length.
283 */
284 return -ENOSPC;
285 }
286 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
287 max_seg_payload = sizeof (struct ib_mad) - offset;
288
289 for (left = packet->length - seg_payload, buf += seg_payload;
290 left; left -= seg_payload, buf += seg_payload) {
291 recv_buf = container_of(recv_buf->list.next,
292 struct ib_mad_recv_buf, list);
293 seg_payload = min(left, max_seg_payload);
294 if (copy_to_user(buf, ((void *) recv_buf->mad) + offset,
295 seg_payload))
296 return -EFAULT;
297 }
298 }
299 return sizeof (packet->mad) + packet->length;
300 }
301
302 static ssize_t copy_send_mad(char __user *buf, struct ib_umad_packet *packet,
303 size_t count)
304 {
305 ssize_t size = sizeof (packet->mad) + packet->length;
306
307 if (count < size)
308 return -EINVAL;
309
310 if (copy_to_user(buf, &packet->mad, size))
311 return -EFAULT;
312
313 return size;
314 }
315
316 static ssize_t ib_umad_read(struct file *filp, char __user *buf,
317 size_t count, loff_t *pos)
318 {
319 struct ib_umad_file *file = filp->private_data;
320 struct ib_umad_packet *packet;
321 ssize_t ret;
322
323 if (count < sizeof (struct ib_user_mad))
324 return -EINVAL;
325
326 spin_lock_irq(&file->recv_lock);
327
328 while (list_empty(&file->recv_list)) {
329 spin_unlock_irq(&file->recv_lock);
330
331 if (filp->f_flags & O_NONBLOCK)
332 return -EAGAIN;
333
334 if (wait_event_interruptible(file->recv_wait,
335 !list_empty(&file->recv_list)))
336 return -ERESTARTSYS;
337
338 spin_lock_irq(&file->recv_lock);
339 }
340
341 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
342 list_del(&packet->list);
343
344 spin_unlock_irq(&file->recv_lock);
345
346 if (packet->recv_wc)
347 ret = copy_recv_mad(buf, packet, count);
348 else
349 ret = copy_send_mad(buf, packet, count);
350
351 if (ret < 0) {
352 /* Requeue packet */
353 spin_lock_irq(&file->recv_lock);
354 list_add(&packet->list, &file->recv_list);
355 spin_unlock_irq(&file->recv_lock);
356 } else {
357 if (packet->recv_wc)
358 ib_free_recv_mad(packet->recv_wc);
359 kfree(packet);
360 }
361 return ret;
362 }
363
364 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
365 {
366 int left, seg;
367
368 /* Copy class specific header */
369 if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
370 copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
371 msg->hdr_len - IB_MGMT_RMPP_HDR))
372 return -EFAULT;
373
374 /* All headers are in place. Copy data segments. */
375 for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
376 seg++, left -= msg->seg_size, buf += msg->seg_size) {
377 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
378 min(left, msg->seg_size)))
379 return -EFAULT;
380 }
381 return 0;
382 }
383
384 static int same_destination(struct ib_user_mad_hdr *hdr1,
385 struct ib_user_mad_hdr *hdr2)
386 {
387 if (!hdr1->grh_present && !hdr2->grh_present)
388 return (hdr1->lid == hdr2->lid);
389
390 if (hdr1->grh_present && hdr2->grh_present)
391 return !memcmp(hdr1->gid, hdr2->gid, 16);
392
393 return 0;
394 }
395
396 static int is_duplicate(struct ib_umad_file *file,
397 struct ib_umad_packet *packet)
398 {
399 struct ib_umad_packet *sent_packet;
400 struct ib_mad_hdr *sent_hdr, *hdr;
401
402 hdr = (struct ib_mad_hdr *) packet->mad.data;
403 list_for_each_entry(sent_packet, &file->send_list, list) {
404 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
405
406 if ((hdr->tid != sent_hdr->tid) ||
407 (hdr->mgmt_class != sent_hdr->mgmt_class))
408 continue;
409
410 /*
411 * No need to be overly clever here. If two new operations have
412 * the same TID, reject the second as a duplicate. This is more
413 * restrictive than required by the spec.
414 */
415 if (!ib_response_mad((struct ib_mad *) hdr)) {
416 if (!ib_response_mad((struct ib_mad *) sent_hdr))
417 return 1;
418 continue;
419 } else if (!ib_response_mad((struct ib_mad *) sent_hdr))
420 continue;
421
422 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
423 return 1;
424 }
425
426 return 0;
427 }
428
429 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
430 size_t count, loff_t *pos)
431 {
432 struct ib_umad_file *file = filp->private_data;
433 struct ib_umad_packet *packet;
434 struct ib_mad_agent *agent;
435 struct ib_ah_attr ah_attr;
436 struct ib_ah *ah;
437 struct ib_rmpp_mad *rmpp_mad;
438 __be64 *tid;
439 int ret, data_len, hdr_len, copy_offset, rmpp_active;
440
441 if (count < sizeof (struct ib_user_mad) + IB_MGMT_RMPP_HDR)
442 return -EINVAL;
443
444 packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
445 if (!packet)
446 return -ENOMEM;
447
448 if (copy_from_user(&packet->mad, buf,
449 sizeof (struct ib_user_mad) + IB_MGMT_RMPP_HDR)) {
450 ret = -EFAULT;
451 goto err;
452 }
453
454 if (packet->mad.hdr.id < 0 ||
455 packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
456 ret = -EINVAL;
457 goto err;
458 }
459
460 down_read(&file->port->mutex);
461
462 agent = __get_agent(file, packet->mad.hdr.id);
463 if (!agent) {
464 ret = -EINVAL;
465 goto err_up;
466 }
467
468 memset(&ah_attr, 0, sizeof ah_attr);
469 ah_attr.dlid = be16_to_cpu(packet->mad.hdr.lid);
470 ah_attr.sl = packet->mad.hdr.sl;
471 ah_attr.src_path_bits = packet->mad.hdr.path_bits;
472 ah_attr.port_num = file->port->port_num;
473 if (packet->mad.hdr.grh_present) {
474 ah_attr.ah_flags = IB_AH_GRH;
475 memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16);
476 ah_attr.grh.flow_label = be32_to_cpu(packet->mad.hdr.flow_label);
477 ah_attr.grh.hop_limit = packet->mad.hdr.hop_limit;
478 ah_attr.grh.traffic_class = packet->mad.hdr.traffic_class;
479 }
480
481 ah = ib_create_ah(agent->qp->pd, &ah_attr);
482 if (IS_ERR(ah)) {
483 ret = PTR_ERR(ah);
484 goto err_up;
485 }
486
487 rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
488 hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
489 if (!ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)) {
490 copy_offset = IB_MGMT_MAD_HDR;
491 rmpp_active = 0;
492 } else {
493 copy_offset = IB_MGMT_RMPP_HDR;
494 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
495 IB_MGMT_RMPP_FLAG_ACTIVE;
496 }
497
498 data_len = count - sizeof (struct ib_user_mad) - hdr_len;
499 packet->msg = ib_create_send_mad(agent,
500 be32_to_cpu(packet->mad.hdr.qpn),
501 0, rmpp_active, hdr_len,
502 data_len, GFP_KERNEL);
503 if (IS_ERR(packet->msg)) {
504 ret = PTR_ERR(packet->msg);
505 goto err_ah;
506 }
507
508 packet->msg->ah = ah;
509 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
510 packet->msg->retries = packet->mad.hdr.retries;
511 packet->msg->context[0] = packet;
512
513 /* Copy MAD header. Any RMPP header is already in place. */
514 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
515 buf += sizeof (struct ib_user_mad);
516
517 if (!rmpp_active) {
518 if (copy_from_user(packet->msg->mad + copy_offset,
519 buf + copy_offset,
520 hdr_len + data_len - copy_offset)) {
521 ret = -EFAULT;
522 goto err_msg;
523 }
524 } else {
525 ret = copy_rmpp_mad(packet->msg, buf);
526 if (ret)
527 goto err_msg;
528 }
529
530 /*
531 * Set the high-order part of the transaction ID to make MADs from
532 * different agents unique, and allow routing responses back to the
533 * original requestor.
534 */
535 if (!ib_response_mad(packet->msg->mad)) {
536 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
537 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
538 (be64_to_cpup(tid) & 0xffffffff));
539 rmpp_mad->mad_hdr.tid = *tid;
540 }
541
542 spin_lock_irq(&file->send_lock);
543 ret = is_duplicate(file, packet);
544 if (!ret)
545 list_add_tail(&packet->list, &file->send_list);
546 spin_unlock_irq(&file->send_lock);
547 if (ret) {
548 ret = -EINVAL;
549 goto err_msg;
550 }
551
552 ret = ib_post_send_mad(packet->msg, NULL);
553 if (ret)
554 goto err_send;
555
556 up_read(&file->port->mutex);
557 return count;
558
559 err_send:
560 dequeue_send(file, packet);
561 err_msg:
562 ib_free_send_mad(packet->msg);
563 err_ah:
564 ib_destroy_ah(ah);
565 err_up:
566 up_read(&file->port->mutex);
567 err:
568 kfree(packet);
569 return ret;
570 }
571
572 static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
573 {
574 struct ib_umad_file *file = filp->private_data;
575
576 /* we will always be able to post a MAD send */
577 unsigned int mask = POLLOUT | POLLWRNORM;
578
579 poll_wait(filp, &file->recv_wait, wait);
580
581 if (!list_empty(&file->recv_list))
582 mask |= POLLIN | POLLRDNORM;
583
584 return mask;
585 }
586
587 static int ib_umad_reg_agent(struct ib_umad_file *file, unsigned long arg)
588 {
589 struct ib_user_mad_reg_req ureq;
590 struct ib_mad_reg_req req;
591 struct ib_mad_agent *agent;
592 int agent_id;
593 int ret;
594
595 down_write(&file->port->mutex);
596
597 if (!file->port->ib_dev) {
598 ret = -EPIPE;
599 goto out;
600 }
601
602 if (copy_from_user(&ureq, (void __user *) arg, sizeof ureq)) {
603 ret = -EFAULT;
604 goto out;
605 }
606
607 if (ureq.qpn != 0 && ureq.qpn != 1) {
608 ret = -EINVAL;
609 goto out;
610 }
611
612 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
613 if (!__get_agent(file, agent_id))
614 goto found;
615
616 ret = -ENOMEM;
617 goto out;
618
619 found:
620 if (ureq.mgmt_class) {
621 req.mgmt_class = ureq.mgmt_class;
622 req.mgmt_class_version = ureq.mgmt_class_version;
623 memcpy(req.method_mask, ureq.method_mask, sizeof req.method_mask);
624 memcpy(req.oui, ureq.oui, sizeof req.oui);
625 }
626
627 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
628 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
629 ureq.mgmt_class ? &req : NULL,
630 ureq.rmpp_version,
631 send_handler, recv_handler, file);
632 if (IS_ERR(agent)) {
633 ret = PTR_ERR(agent);
634 goto out;
635 }
636
637 if (put_user(agent_id,
638 (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
639 ret = -EFAULT;
640 ib_unregister_mad_agent(agent);
641 goto out;
642 }
643
644 file->agent[agent_id] = agent;
645 ret = 0;
646
647 out:
648 up_write(&file->port->mutex);
649 return ret;
650 }
651
652 static int ib_umad_unreg_agent(struct ib_umad_file *file, unsigned long arg)
653 {
654 struct ib_mad_agent *agent = NULL;
655 u32 id;
656 int ret = 0;
657
658 if (get_user(id, (u32 __user *) arg))
659 return -EFAULT;
660
661 down_write(&file->port->mutex);
662
663 if (id < 0 || id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
664 ret = -EINVAL;
665 goto out;
666 }
667
668 agent = file->agent[id];
669 file->agent[id] = NULL;
670
671 out:
672 up_write(&file->port->mutex);
673
674 if (agent)
675 ib_unregister_mad_agent(agent);
676
677 return ret;
678 }
679
680 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
681 unsigned long arg)
682 {
683 switch (cmd) {
684 case IB_USER_MAD_REGISTER_AGENT:
685 return ib_umad_reg_agent(filp->private_data, arg);
686 case IB_USER_MAD_UNREGISTER_AGENT:
687 return ib_umad_unreg_agent(filp->private_data, arg);
688 default:
689 return -ENOIOCTLCMD;
690 }
691 }
692
693 static int ib_umad_open(struct inode *inode, struct file *filp)
694 {
695 struct ib_umad_port *port;
696 struct ib_umad_file *file;
697 int ret = 0;
698
699 spin_lock(&port_lock);
700 port = umad_port[iminor(inode) - IB_UMAD_MINOR_BASE];
701 if (port)
702 kref_get(&port->umad_dev->ref);
703 spin_unlock(&port_lock);
704
705 if (!port)
706 return -ENXIO;
707
708 down_write(&port->mutex);
709
710 if (!port->ib_dev) {
711 ret = -ENXIO;
712 goto out;
713 }
714
715 file = kzalloc(sizeof *file, GFP_KERNEL);
716 if (!file) {
717 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
718 ret = -ENOMEM;
719 goto out;
720 }
721
722 spin_lock_init(&file->recv_lock);
723 spin_lock_init(&file->send_lock);
724 INIT_LIST_HEAD(&file->recv_list);
725 INIT_LIST_HEAD(&file->send_list);
726 init_waitqueue_head(&file->recv_wait);
727
728 file->port = port;
729 filp->private_data = file;
730
731 list_add_tail(&file->port_list, &port->file_list);
732
733 out:
734 up_write(&port->mutex);
735 return ret;
736 }
737
738 static int ib_umad_close(struct inode *inode, struct file *filp)
739 {
740 struct ib_umad_file *file = filp->private_data;
741 struct ib_umad_device *dev = file->port->umad_dev;
742 struct ib_umad_packet *packet, *tmp;
743 int already_dead;
744 int i;
745
746 down_write(&file->port->mutex);
747
748 already_dead = file->agents_dead;
749 file->agents_dead = 1;
750
751 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
752 if (packet->recv_wc)
753 ib_free_recv_mad(packet->recv_wc);
754 kfree(packet);
755 }
756
757 list_del(&file->port_list);
758
759 downgrade_write(&file->port->mutex);
760
761 if (!already_dead)
762 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
763 if (file->agent[i])
764 ib_unregister_mad_agent(file->agent[i]);
765
766 up_read(&file->port->mutex);
767
768 kfree(file);
769 kref_put(&dev->ref, ib_umad_release_dev);
770
771 return 0;
772 }
773
774 static const struct file_operations umad_fops = {
775 .owner = THIS_MODULE,
776 .read = ib_umad_read,
777 .write = ib_umad_write,
778 .poll = ib_umad_poll,
779 .unlocked_ioctl = ib_umad_ioctl,
780 .compat_ioctl = ib_umad_ioctl,
781 .open = ib_umad_open,
782 .release = ib_umad_close
783 };
784
785 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
786 {
787 struct ib_umad_port *port;
788 struct ib_port_modify props = {
789 .set_port_cap_mask = IB_PORT_SM
790 };
791 int ret;
792
793 spin_lock(&port_lock);
794 port = umad_port[iminor(inode) - IB_UMAD_MINOR_BASE - IB_UMAD_MAX_PORTS];
795 if (port)
796 kref_get(&port->umad_dev->ref);
797 spin_unlock(&port_lock);
798
799 if (!port)
800 return -ENXIO;
801
802 if (filp->f_flags & O_NONBLOCK) {
803 if (down_trylock(&port->sm_sem)) {
804 ret = -EAGAIN;
805 goto fail;
806 }
807 } else {
808 if (down_interruptible(&port->sm_sem)) {
809 ret = -ERESTARTSYS;
810 goto fail;
811 }
812 }
813
814 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
815 if (ret) {
816 up(&port->sm_sem);
817 goto fail;
818 }
819
820 filp->private_data = port;
821
822 return 0;
823
824 fail:
825 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
826 return ret;
827 }
828
829 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
830 {
831 struct ib_umad_port *port = filp->private_data;
832 struct ib_port_modify props = {
833 .clr_port_cap_mask = IB_PORT_SM
834 };
835 int ret = 0;
836
837 down_write(&port->mutex);
838 if (port->ib_dev)
839 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
840 up_write(&port->mutex);
841
842 up(&port->sm_sem);
843
844 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
845
846 return ret;
847 }
848
849 static const struct file_operations umad_sm_fops = {
850 .owner = THIS_MODULE,
851 .open = ib_umad_sm_open,
852 .release = ib_umad_sm_close
853 };
854
855 static struct ib_client umad_client = {
856 .name = "umad",
857 .add = ib_umad_add_one,
858 .remove = ib_umad_remove_one
859 };
860
861 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
862 {
863 struct ib_umad_port *port = class_get_devdata(class_dev);
864
865 if (!port)
866 return -ENODEV;
867
868 return sprintf(buf, "%s\n", port->ib_dev->name);
869 }
870 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
871
872 static ssize_t show_port(struct class_device *class_dev, char *buf)
873 {
874 struct ib_umad_port *port = class_get_devdata(class_dev);
875
876 if (!port)
877 return -ENODEV;
878
879 return sprintf(buf, "%d\n", port->port_num);
880 }
881 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
882
883 static ssize_t show_abi_version(struct class *class, char *buf)
884 {
885 return sprintf(buf, "%d\n", IB_USER_MAD_ABI_VERSION);
886 }
887 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
888
889 static int ib_umad_init_port(struct ib_device *device, int port_num,
890 struct ib_umad_port *port)
891 {
892 spin_lock(&port_lock);
893 port->dev_num = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
894 if (port->dev_num >= IB_UMAD_MAX_PORTS) {
895 spin_unlock(&port_lock);
896 return -1;
897 }
898 set_bit(port->dev_num, dev_map);
899 spin_unlock(&port_lock);
900
901 port->ib_dev = device;
902 port->port_num = port_num;
903 init_MUTEX(&port->sm_sem);
904 init_rwsem(&port->mutex);
905 INIT_LIST_HEAD(&port->file_list);
906
907 port->dev = cdev_alloc();
908 if (!port->dev)
909 return -1;
910 port->dev->owner = THIS_MODULE;
911 port->dev->ops = &umad_fops;
912 kobject_set_name(&port->dev->kobj, "umad%d", port->dev_num);
913 if (cdev_add(port->dev, base_dev + port->dev_num, 1))
914 goto err_cdev;
915
916 port->class_dev = class_device_create(umad_class, NULL, port->dev->dev,
917 device->dma_device,
918 "umad%d", port->dev_num);
919 if (IS_ERR(port->class_dev))
920 goto err_cdev;
921
922 if (class_device_create_file(port->class_dev, &class_device_attr_ibdev))
923 goto err_class;
924 if (class_device_create_file(port->class_dev, &class_device_attr_port))
925 goto err_class;
926
927 port->sm_dev = cdev_alloc();
928 if (!port->sm_dev)
929 goto err_class;
930 port->sm_dev->owner = THIS_MODULE;
931 port->sm_dev->ops = &umad_sm_fops;
932 kobject_set_name(&port->sm_dev->kobj, "issm%d", port->dev_num);
933 if (cdev_add(port->sm_dev, base_dev + port->dev_num + IB_UMAD_MAX_PORTS, 1))
934 goto err_sm_cdev;
935
936 port->sm_class_dev = class_device_create(umad_class, NULL, port->sm_dev->dev,
937 device->dma_device,
938 "issm%d", port->dev_num);
939 if (IS_ERR(port->sm_class_dev))
940 goto err_sm_cdev;
941
942 class_set_devdata(port->class_dev, port);
943 class_set_devdata(port->sm_class_dev, port);
944
945 if (class_device_create_file(port->sm_class_dev, &class_device_attr_ibdev))
946 goto err_sm_class;
947 if (class_device_create_file(port->sm_class_dev, &class_device_attr_port))
948 goto err_sm_class;
949
950 spin_lock(&port_lock);
951 umad_port[port->dev_num] = port;
952 spin_unlock(&port_lock);
953
954 return 0;
955
956 err_sm_class:
957 class_device_destroy(umad_class, port->sm_dev->dev);
958
959 err_sm_cdev:
960 cdev_del(port->sm_dev);
961
962 err_class:
963 class_device_destroy(umad_class, port->dev->dev);
964
965 err_cdev:
966 cdev_del(port->dev);
967 clear_bit(port->dev_num, dev_map);
968
969 return -1;
970 }
971
972 static void ib_umad_kill_port(struct ib_umad_port *port)
973 {
974 struct ib_umad_file *file;
975 int id;
976
977 class_set_devdata(port->class_dev, NULL);
978 class_set_devdata(port->sm_class_dev, NULL);
979
980 class_device_destroy(umad_class, port->dev->dev);
981 class_device_destroy(umad_class, port->sm_dev->dev);
982
983 cdev_del(port->dev);
984 cdev_del(port->sm_dev);
985
986 spin_lock(&port_lock);
987 umad_port[port->dev_num] = NULL;
988 spin_unlock(&port_lock);
989
990 down_write(&port->mutex);
991
992 port->ib_dev = NULL;
993
994 /*
995 * Now go through the list of files attached to this port and
996 * unregister all of their MAD agents. We need to hold
997 * port->mutex while doing this to avoid racing with
998 * ib_umad_close(), but we can't hold the mutex for writing
999 * while calling ib_unregister_mad_agent(), since that might
1000 * deadlock by calling back into queue_packet(). So we
1001 * downgrade our lock to a read lock, and then drop and
1002 * reacquire the write lock for the next iteration.
1003 *
1004 * We do list_del_init() on the file's list_head so that the
1005 * list_del in ib_umad_close() is still OK, even after the
1006 * file is removed from the list.
1007 */
1008 while (!list_empty(&port->file_list)) {
1009 file = list_entry(port->file_list.next, struct ib_umad_file,
1010 port_list);
1011
1012 file->agents_dead = 1;
1013 list_del_init(&file->port_list);
1014
1015 downgrade_write(&port->mutex);
1016
1017 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1018 if (file->agent[id])
1019 ib_unregister_mad_agent(file->agent[id]);
1020
1021 up_read(&port->mutex);
1022 down_write(&port->mutex);
1023 }
1024
1025 up_write(&port->mutex);
1026
1027 clear_bit(port->dev_num, dev_map);
1028 }
1029
1030 static void ib_umad_add_one(struct ib_device *device)
1031 {
1032 struct ib_umad_device *umad_dev;
1033 int s, e, i;
1034
1035 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1036 return;
1037
1038 if (device->node_type == RDMA_NODE_IB_SWITCH)
1039 s = e = 0;
1040 else {
1041 s = 1;
1042 e = device->phys_port_cnt;
1043 }
1044
1045 umad_dev = kzalloc(sizeof *umad_dev +
1046 (e - s + 1) * sizeof (struct ib_umad_port),
1047 GFP_KERNEL);
1048 if (!umad_dev)
1049 return;
1050
1051 kref_init(&umad_dev->ref);
1052
1053 umad_dev->start_port = s;
1054 umad_dev->end_port = e;
1055
1056 for (i = s; i <= e; ++i) {
1057 umad_dev->port[i - s].umad_dev = umad_dev;
1058
1059 if (ib_umad_init_port(device, i, &umad_dev->port[i - s]))
1060 goto err;
1061 }
1062
1063 ib_set_client_data(device, &umad_client, umad_dev);
1064
1065 return;
1066
1067 err:
1068 while (--i >= s)
1069 ib_umad_kill_port(&umad_dev->port[i - s]);
1070
1071 kref_put(&umad_dev->ref, ib_umad_release_dev);
1072 }
1073
1074 static void ib_umad_remove_one(struct ib_device *device)
1075 {
1076 struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client);
1077 int i;
1078
1079 if (!umad_dev)
1080 return;
1081
1082 for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i)
1083 ib_umad_kill_port(&umad_dev->port[i]);
1084
1085 kref_put(&umad_dev->ref, ib_umad_release_dev);
1086 }
1087
1088 static int __init ib_umad_init(void)
1089 {
1090 int ret;
1091
1092 ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
1093 "infiniband_mad");
1094 if (ret) {
1095 printk(KERN_ERR "user_mad: couldn't register device number\n");
1096 goto out;
1097 }
1098
1099 umad_class = class_create(THIS_MODULE, "infiniband_mad");
1100 if (IS_ERR(umad_class)) {
1101 ret = PTR_ERR(umad_class);
1102 printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n");
1103 goto out_chrdev;
1104 }
1105
1106 ret = class_create_file(umad_class, &class_attr_abi_version);
1107 if (ret) {
1108 printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n");
1109 goto out_class;
1110 }
1111
1112 ret = ib_register_client(&umad_client);
1113 if (ret) {
1114 printk(KERN_ERR "user_mad: couldn't register ib_umad client\n");
1115 goto out_class;
1116 }
1117
1118 return 0;
1119
1120 out_class:
1121 class_destroy(umad_class);
1122
1123 out_chrdev:
1124 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1125
1126 out:
1127 return ret;
1128 }
1129
1130 static void __exit ib_umad_cleanup(void)
1131 {
1132 ib_unregister_client(&umad_client);
1133 class_destroy(umad_class);
1134 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1135 }
1136
1137 module_init(ib_umad_init);
1138 module_exit(ib_umad_cleanup);
Linux with added FPC-III support