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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
56MODULE_AUTHOR("Roland Dreier");
57MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");
58MODULE_LICENSE("Dual BSD/GPL");
59
60enum {
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
82struct 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
99struct ib_umad_device {
100 int start_port, end_port;
101 struct kref ref;
102 struct ib_umad_port port[0];
103};
104
105struct 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
119struct 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
127static struct class *umad_class;
128
129static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
130
131static DEFINE_SPINLOCK(port_lock);
132static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS);
133
134static void ib_umad_add_one(struct ib_device *device);
135static void ib_umad_remove_one(struct ib_device *device);
136
137static void ib_umad_release_dev(struct kref *ref)
138{
139 struct ib_umad_device *dev =
140 container_of(ref, struct ib_umad_device, ref);
141
142 kfree(dev);
143}
144
145static int hdr_size(struct ib_umad_file *file)
146{
147 return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) :
148 sizeof (struct ib_user_mad_hdr_old);
149}
150
151/* caller must hold file->mutex */
152static 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
157static 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 mutex_lock(&file->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 list_add_tail(&packet->list, &file->recv_list);
170 wake_up_interruptible(&file->recv_wait);
171 ret = 0;
172 break;
173 }
174
175 mutex_unlock(&file->mutex);
176
177 return ret;
178}
179
180static void dequeue_send(struct ib_umad_file *file,
181 struct ib_umad_packet *packet)
182{
183 spin_lock_irq(&file->send_lock);
184 list_del(&packet->list);
185 spin_unlock_irq(&file->send_lock);
186}
187
188static void send_handler(struct ib_mad_agent *agent,
189 struct ib_mad_send_wc *send_wc)
190{
191 struct ib_umad_file *file = agent->context;
192 struct ib_umad_packet *packet = send_wc->send_buf->context[0];
193
194 dequeue_send(file, packet);
195 ib_destroy_ah(packet->msg->ah);
196 ib_free_send_mad(packet->msg);
197
198 if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
199 packet->length = IB_MGMT_MAD_HDR;
200 packet->mad.hdr.status = ETIMEDOUT;
201 if (!queue_packet(file, agent, packet))
202 return;
203 }
204 kfree(packet);
205}
206
207static void recv_handler(struct ib_mad_agent *agent,
208 struct ib_mad_recv_wc *mad_recv_wc)
209{
210 struct ib_umad_file *file = agent->context;
211 struct ib_umad_packet *packet;
212
213 if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
214 goto err1;
215
216 packet = kzalloc(sizeof *packet, GFP_KERNEL);
217 if (!packet)
218 goto err1;
219
220 packet->length = mad_recv_wc->mad_len;
221 packet->recv_wc = mad_recv_wc;
222
223 packet->mad.hdr.status = 0;
224 packet->mad.hdr.length = hdr_size(file) + mad_recv_wc->mad_len;
225 packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp);
226 packet->mad.hdr.lid = cpu_to_be16(mad_recv_wc->wc->slid);
227 packet->mad.hdr.sl = mad_recv_wc->wc->sl;
228 packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits;
229 packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;
230 packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
231 if (packet->mad.hdr.grh_present) {
232 struct ib_ah_attr ah_attr;
233
234 ib_init_ah_from_wc(agent->device, agent->port_num,
235 mad_recv_wc->wc, mad_recv_wc->recv_buf.grh,
236 &ah_attr);
237
238 packet->mad.hdr.gid_index = ah_attr.grh.sgid_index;
239 packet->mad.hdr.hop_limit = ah_attr.grh.hop_limit;
240 packet->mad.hdr.traffic_class = ah_attr.grh.traffic_class;
241 memcpy(packet->mad.hdr.gid, &ah_attr.grh.dgid, 16);
242 packet->mad.hdr.flow_label = cpu_to_be32(ah_attr.grh.flow_label);
243 }
244
245 if (queue_packet(file, agent, packet))
246 goto err2;
247 return;
248
249err2:
250 kfree(packet);
251err1:
252 ib_free_recv_mad(mad_recv_wc);
253}
254
255static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
256 struct ib_umad_packet *packet, size_t count)
257{
258 struct ib_mad_recv_buf *recv_buf;
259 int left, seg_payload, offset, max_seg_payload;
260
261 /* We need enough room to copy the first (or only) MAD segment. */
262 recv_buf = &packet->recv_wc->recv_buf;
263 if ((packet->length <= sizeof (*recv_buf->mad) &&
264 count < hdr_size(file) + packet->length) ||
265 (packet->length > sizeof (*recv_buf->mad) &&
266 count < hdr_size(file) + sizeof (*recv_buf->mad)))
267 return -EINVAL;
268
269 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
270 return -EFAULT;
271
272 buf += hdr_size(file);
273 seg_payload = min_t(int, packet->length, sizeof (*recv_buf->mad));
274 if (copy_to_user(buf, recv_buf->mad, seg_payload))
275 return -EFAULT;
276
277 if (seg_payload < packet->length) {
278 /*
279 * Multipacket RMPP MAD message. Copy remainder of message.
280 * Note that last segment may have a shorter payload.
281 */
282 if (count < hdr_size(file) + packet->length) {
283 /*
284 * The buffer is too small, return the first RMPP segment,
285 * which includes the RMPP message length.
286 */
287 return -ENOSPC;
288 }
289 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
290 max_seg_payload = sizeof (struct ib_mad) - offset;
291
292 for (left = packet->length - seg_payload, buf += seg_payload;
293 left; left -= seg_payload, buf += seg_payload) {
294 recv_buf = container_of(recv_buf->list.next,
295 struct ib_mad_recv_buf, list);
296 seg_payload = min(left, max_seg_payload);
297 if (copy_to_user(buf, ((void *) recv_buf->mad) + offset,
298 seg_payload))
299 return -EFAULT;
300 }
301 }
302 return hdr_size(file) + packet->length;
303}
304
305static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
306 struct ib_umad_packet *packet, size_t count)
307{
308 ssize_t size = hdr_size(file) + packet->length;
309
310 if (count < size)
311 return -EINVAL;
312
313 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
314 return -EFAULT;
315
316 buf += hdr_size(file);
317
318 if (copy_to_user(buf, packet->mad.data, packet->length))
319 return -EFAULT;
320
321 return size;
322}
323
324static ssize_t ib_umad_read(struct file *filp, char __user *buf,
325 size_t count, loff_t *pos)
326{
327 struct ib_umad_file *file = filp->private_data;
328 struct ib_umad_packet *packet;
329 ssize_t ret;
330
331 if (count < hdr_size(file))
332 return -EINVAL;
333
334 mutex_lock(&file->mutex);
335
336 while (list_empty(&file->recv_list)) {
337 mutex_unlock(&file->mutex);
338
339 if (filp->f_flags & O_NONBLOCK)
340 return -EAGAIN;
341
342 if (wait_event_interruptible(file->recv_wait,
343 !list_empty(&file->recv_list)))
344 return -ERESTARTSYS;
345
346 mutex_lock(&file->mutex);
347 }
348
349 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
350 list_del(&packet->list);
351
352 mutex_unlock(&file->mutex);
353
354 if (packet->recv_wc)
355 ret = copy_recv_mad(file, buf, packet, count);
356 else
357 ret = copy_send_mad(file, buf, packet, count);
358
359 if (ret < 0) {
360 /* Requeue packet */
361 mutex_lock(&file->mutex);
362 list_add(&packet->list, &file->recv_list);
363 mutex_unlock(&file->mutex);
364 } else {
365 if (packet->recv_wc)
366 ib_free_recv_mad(packet->recv_wc);
367 kfree(packet);
368 }
369 return ret;
370}
371
372static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
373{
374 int left, seg;
375
376 /* Copy class specific header */
377 if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
378 copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
379 msg->hdr_len - IB_MGMT_RMPP_HDR))
380 return -EFAULT;
381
382 /* All headers are in place. Copy data segments. */
383 for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
384 seg++, left -= msg->seg_size, buf += msg->seg_size) {
385 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
386 min(left, msg->seg_size)))
387 return -EFAULT;
388 }
389 return 0;
390}
391
392static int same_destination(struct ib_user_mad_hdr *hdr1,
393 struct ib_user_mad_hdr *hdr2)
394{
395 if (!hdr1->grh_present && !hdr2->grh_present)
396 return (hdr1->lid == hdr2->lid);
397
398 if (hdr1->grh_present && hdr2->grh_present)
399 return !memcmp(hdr1->gid, hdr2->gid, 16);
400
401 return 0;
402}
403
404static int is_duplicate(struct ib_umad_file *file,
405 struct ib_umad_packet *packet)
406{
407 struct ib_umad_packet *sent_packet;
408 struct ib_mad_hdr *sent_hdr, *hdr;
409
410 hdr = (struct ib_mad_hdr *) packet->mad.data;
411 list_for_each_entry(sent_packet, &file->send_list, list) {
412 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
413
414 if ((hdr->tid != sent_hdr->tid) ||
415 (hdr->mgmt_class != sent_hdr->mgmt_class))
416 continue;
417
418 /*
419 * No need to be overly clever here. If two new operations have
420 * the same TID, reject the second as a duplicate. This is more
421 * restrictive than required by the spec.
422 */
423 if (!ib_response_mad((struct ib_mad *) hdr)) {
424 if (!ib_response_mad((struct ib_mad *) sent_hdr))
425 return 1;
426 continue;
427 } else if (!ib_response_mad((struct ib_mad *) sent_hdr))
428 continue;
429
430 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
431 return 1;
432 }
433
434 return 0;
435}
436
437static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
438 size_t count, loff_t *pos)
439{
440 struct ib_umad_file *file = filp->private_data;
441 struct ib_umad_packet *packet;
442 struct ib_mad_agent *agent;
443 struct ib_ah_attr ah_attr;
444 struct ib_ah *ah;
445 struct ib_rmpp_mad *rmpp_mad;
446 __be64 *tid;
447 int ret, data_len, hdr_len, copy_offset, rmpp_active;
448
449 if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
450 return -EINVAL;
451
452 packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
453 if (!packet)
454 return -ENOMEM;
455
456 if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
457 ret = -EFAULT;
458 goto err;
459 }
460
461 if (packet->mad.hdr.id < 0 ||
462 packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
463 ret = -EINVAL;
464 goto err;
465 }
466
467 buf += hdr_size(file);
468
469 if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
470 ret = -EFAULT;
471 goto err;
472 }
473
474 mutex_lock(&file->mutex);
475
476 agent = __get_agent(file, packet->mad.hdr.id);
477 if (!agent) {
478 ret = -EINVAL;
479 goto err_up;
480 }
481
482 memset(&ah_attr, 0, sizeof ah_attr);
483 ah_attr.dlid = be16_to_cpu(packet->mad.hdr.lid);
484 ah_attr.sl = packet->mad.hdr.sl;
485 ah_attr.src_path_bits = packet->mad.hdr.path_bits;
486 ah_attr.port_num = file->port->port_num;
487 if (packet->mad.hdr.grh_present) {
488 ah_attr.ah_flags = IB_AH_GRH;
489 memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16);
490 ah_attr.grh.sgid_index = packet->mad.hdr.gid_index;
491 ah_attr.grh.flow_label = be32_to_cpu(packet->mad.hdr.flow_label);
492 ah_attr.grh.hop_limit = packet->mad.hdr.hop_limit;
493 ah_attr.grh.traffic_class = packet->mad.hdr.traffic_class;
494 }
495
496 ah = ib_create_ah(agent->qp->pd, &ah_attr);
497 if (IS_ERR(ah)) {
498 ret = PTR_ERR(ah);
499 goto err_up;
500 }
501
502 rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
503 hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
504 if (!ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)) {
505 copy_offset = IB_MGMT_MAD_HDR;
506 rmpp_active = 0;
507 } else {
508 copy_offset = IB_MGMT_RMPP_HDR;
509 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
510 IB_MGMT_RMPP_FLAG_ACTIVE;
511 }
512
513 data_len = count - hdr_size(file) - hdr_len;
514 packet->msg = ib_create_send_mad(agent,
515 be32_to_cpu(packet->mad.hdr.qpn),
516 packet->mad.hdr.pkey_index, rmpp_active,
517 hdr_len, data_len, GFP_KERNEL);
518 if (IS_ERR(packet->msg)) {
519 ret = PTR_ERR(packet->msg);
520 goto err_ah;
521 }
522
523 packet->msg->ah = ah;
524 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
525 packet->msg->retries = packet->mad.hdr.retries;
526 packet->msg->context[0] = packet;
527
528 /* Copy MAD header. Any RMPP header is already in place. */
529 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
530
531 if (!rmpp_active) {
532 if (copy_from_user(packet->msg->mad + copy_offset,
533 buf + copy_offset,
534 hdr_len + data_len - copy_offset)) {
535 ret = -EFAULT;
536 goto err_msg;
537 }
538 } else {
539 ret = copy_rmpp_mad(packet->msg, buf);
540 if (ret)
541 goto err_msg;
542 }
543
544 /*
545 * Set the high-order part of the transaction ID to make MADs from
546 * different agents unique, and allow routing responses back to the
547 * original requestor.
548 */
549 if (!ib_response_mad(packet->msg->mad)) {
550 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
551 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
552 (be64_to_cpup(tid) & 0xffffffff));
553 rmpp_mad->mad_hdr.tid = *tid;
554 }
555
556 spin_lock_irq(&file->send_lock);
557 ret = is_duplicate(file, packet);
558 if (!ret)
559 list_add_tail(&packet->list, &file->send_list);
560 spin_unlock_irq(&file->send_lock);
561 if (ret) {
562 ret = -EINVAL;
563 goto err_msg;
564 }
565
566 ret = ib_post_send_mad(packet->msg, NULL);
567 if (ret)
568 goto err_send;
569
570 mutex_unlock(&file->mutex);
571 return count;
572
573err_send:
574 dequeue_send(file, packet);
575err_msg:
576 ib_free_send_mad(packet->msg);
577err_ah:
578 ib_destroy_ah(ah);
579err_up:
580 mutex_unlock(&file->mutex);
581err:
582 kfree(packet);
583 return ret;
584}
585
586static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
587{
588 struct ib_umad_file *file = filp->private_data;
589
590 /* we will always be able to post a MAD send */
591 unsigned int mask = POLLOUT | POLLWRNORM;
592
593 poll_wait(filp, &file->recv_wait, wait);
594
595 if (!list_empty(&file->recv_list))
596 mask |= POLLIN | POLLRDNORM;
597
598 return mask;
599}
600
601static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
602 int compat_method_mask)
603{
604 struct ib_user_mad_reg_req ureq;
605 struct ib_mad_reg_req req;
606 struct ib_mad_agent *agent = NULL;
607 int agent_id;
608 int ret;
609
610 mutex_lock(&file->port->file_mutex);
611 mutex_lock(&file->mutex);
612
613 if (!file->port->ib_dev) {
614 ret = -EPIPE;
615 goto out;
616 }
617
618 if (copy_from_user(&ureq, arg, sizeof ureq)) {
619 ret = -EFAULT;
620 goto out;
621 }
622
623 if (ureq.qpn != 0 && ureq.qpn != 1) {
624 ret = -EINVAL;
625 goto out;
626 }
627
628 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
629 if (!__get_agent(file, agent_id))
630 goto found;
631
632 ret = -ENOMEM;
633 goto out;
634
635found:
636 if (ureq.mgmt_class) {
637 req.mgmt_class = ureq.mgmt_class;
638 req.mgmt_class_version = ureq.mgmt_class_version;
639 memcpy(req.oui, ureq.oui, sizeof req.oui);
640
641 if (compat_method_mask) {
642 u32 *umm = (u32 *) ureq.method_mask;
643 int i;
644
645 for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
646 req.method_mask[i] =
647 umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
648 } else
649 memcpy(req.method_mask, ureq.method_mask,
650 sizeof req.method_mask);
651 }
652
653 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
654 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
655 ureq.mgmt_class ? &req : NULL,
656 ureq.rmpp_version,
657 send_handler, recv_handler, file);
658 if (IS_ERR(agent)) {
659 ret = PTR_ERR(agent);
660 agent = NULL;
661 goto out;
662 }
663
664 if (put_user(agent_id,
665 (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
666 ret = -EFAULT;
667 goto out;
668 }
669
670 if (!file->already_used) {
671 file->already_used = 1;
672 if (!file->use_pkey_index) {
673 printk(KERN_WARNING "user_mad: process %s did not enable "
674 "P_Key index support.\n", current->comm);
675 printk(KERN_WARNING "user_mad: Documentation/infiniband/user_mad.txt "
676 "has info on the new ABI.\n");
677 }
678 }
679
680 file->agent[agent_id] = agent;
681 ret = 0;
682
683out:
684 mutex_unlock(&file->mutex);
685
686 if (ret && agent)
687 ib_unregister_mad_agent(agent);
688
689 mutex_unlock(&file->port->file_mutex);
690
691 return ret;
692}
693
694static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
695{
696 struct ib_mad_agent *agent = NULL;
697 u32 id;
698 int ret = 0;
699
700 if (get_user(id, arg))
701 return -EFAULT;
702
703 mutex_lock(&file->port->file_mutex);
704 mutex_lock(&file->mutex);
705
706 if (id < 0 || id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
707 ret = -EINVAL;
708 goto out;
709 }
710
711 agent = file->agent[id];
712 file->agent[id] = NULL;
713
714out:
715 mutex_unlock(&file->mutex);
716
717 if (agent)
718 ib_unregister_mad_agent(agent);
719
720 mutex_unlock(&file->port->file_mutex);
721
722 return ret;
723}
724
725static long ib_umad_enable_pkey(struct ib_umad_file *file)
726{
727 int ret = 0;
728
729 mutex_lock(&file->mutex);
730 if (file->already_used)
731 ret = -EINVAL;
732 else
733 file->use_pkey_index = 1;
734 mutex_unlock(&file->mutex);
735
736 return ret;
737}
738
739static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
740 unsigned long arg)
741{
742 switch (cmd) {
743 case IB_USER_MAD_REGISTER_AGENT:
744 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
745 case IB_USER_MAD_UNREGISTER_AGENT:
746 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
747 case IB_USER_MAD_ENABLE_PKEY:
748 return ib_umad_enable_pkey(filp->private_data);
749 default:
750 return -ENOIOCTLCMD;
751 }
752}
753
754#ifdef CONFIG_COMPAT
755static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
756 unsigned long arg)
757{
758 switch (cmd) {
759 case IB_USER_MAD_REGISTER_AGENT:
760 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
761 case IB_USER_MAD_UNREGISTER_AGENT:
762 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
763 case IB_USER_MAD_ENABLE_PKEY:
764 return ib_umad_enable_pkey(filp->private_data);
765 default:
766 return -ENOIOCTLCMD;
767 }
768}
769#endif
770
771/*
772 * ib_umad_open() does not need the BKL:
773 *
774 * - the ib_umad_port structures are properly reference counted, and
775 * everything else is purely local to the file being created, so
776 * races against other open calls are not a problem;
777 * - the ioctl method does not affect any global state outside of the
778 * file structure being operated on;
779 */
780static 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;
785
786 port = container_of(inode->i_cdev, struct ib_umad_port, cdev);
787 if (port)
788 kref_get(&port->umad_dev->ref);
789 else
790 return -ENXIO;
791
792 mutex_lock(&port->file_mutex);
793
794 if (!port->ib_dev) {
795 ret = -ENXIO;
796 goto out;
797 }
798
799 file = kzalloc(sizeof *file, GFP_KERNEL);
800 if (!file) {
801 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
802 ret = -ENOMEM;
803 goto out;
804 }
805
806 mutex_init(&file->mutex);
807 spin_lock_init(&file->send_lock);
808 INIT_LIST_HEAD(&file->recv_list);
809 INIT_LIST_HEAD(&file->send_list);
810 init_waitqueue_head(&file->recv_wait);
811
812 file->port = port;
813 filp->private_data = file;
814
815 list_add_tail(&file->port_list, &port->file_list);
816
817 ret = nonseekable_open(inode, filp);
818
819out:
820 mutex_unlock(&port->file_mutex);
821 return ret;
822}
823
824static int ib_umad_close(struct inode *inode, struct file *filp)
825{
826 struct ib_umad_file *file = filp->private_data;
827 struct ib_umad_device *dev = file->port->umad_dev;
828 struct ib_umad_packet *packet, *tmp;
829 int already_dead;
830 int i;
831
832 mutex_lock(&file->port->file_mutex);
833 mutex_lock(&file->mutex);
834
835 already_dead = file->agents_dead;
836 file->agents_dead = 1;
837
838 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
839 if (packet->recv_wc)
840 ib_free_recv_mad(packet->recv_wc);
841 kfree(packet);
842 }
843
844 list_del(&file->port_list);
845
846 mutex_unlock(&file->mutex);
847
848 if (!already_dead)
849 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
850 if (file->agent[i])
851 ib_unregister_mad_agent(file->agent[i]);
852
853 mutex_unlock(&file->port->file_mutex);
854
855 kfree(file);
856 kref_put(&dev->ref, ib_umad_release_dev);
857
858 return 0;
859}
860
861static const struct file_operations umad_fops = {
862 .owner = THIS_MODULE,
863 .read = ib_umad_read,
864 .write = ib_umad_write,
865 .poll = ib_umad_poll,
866 .unlocked_ioctl = ib_umad_ioctl,
867#ifdef CONFIG_COMPAT
868 .compat_ioctl = ib_umad_compat_ioctl,
869#endif
870 .open = ib_umad_open,
871 .release = ib_umad_close,
872 .llseek = no_llseek,
873};
874
875static 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 port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev);
884 if (port)
885 kref_get(&port->umad_dev->ref);
886 else
887 return -ENXIO;
888
889 if (filp->f_flags & O_NONBLOCK) {
890 if (down_trylock(&port->sm_sem)) {
891 ret = -EAGAIN;
892 goto fail;
893 }
894 } else {
895 if (down_interruptible(&port->sm_sem)) {
896 ret = -ERESTARTSYS;
897 goto fail;
898 }
899 }
900
901 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
902 if (ret) {
903 up(&port->sm_sem);
904 goto fail;
905 }
906
907 filp->private_data = port;
908
909 return nonseekable_open(inode, filp);
910
911fail:
912 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
913 return ret;
914}
915
916static int ib_umad_sm_close(struct inode *inode, struct file *filp)
917{
918 struct ib_umad_port *port = filp->private_data;
919 struct ib_port_modify props = {
920 .clr_port_cap_mask = IB_PORT_SM
921 };
922 int ret = 0;
923
924 mutex_lock(&port->file_mutex);
925 if (port->ib_dev)
926 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
927 mutex_unlock(&port->file_mutex);
928
929 up(&port->sm_sem);
930
931 kref_put(&port->umad_dev->ref, ib_umad_release_dev);
932
933 return ret;
934}
935
936static const struct file_operations umad_sm_fops = {
937 .owner = THIS_MODULE,
938 .open = ib_umad_sm_open,
939 .release = ib_umad_sm_close,
940 .llseek = no_llseek,
941};
942
943static struct ib_client umad_client = {
944 .name = "umad",
945 .add = ib_umad_add_one,
946 .remove = ib_umad_remove_one
947};
948
949static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
950 char *buf)
951{
952 struct ib_umad_port *port = dev_get_drvdata(dev);
953
954 if (!port)
955 return -ENODEV;
956
957 return sprintf(buf, "%s\n", port->ib_dev->name);
958}
959static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
960
961static ssize_t show_port(struct device *dev, struct device_attribute *attr,
962 char *buf)
963{
964 struct ib_umad_port *port = dev_get_drvdata(dev);
965
966 if (!port)
967 return -ENODEV;
968
969 return sprintf(buf, "%d\n", port->port_num);
970}
971static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
972
973static CLASS_ATTR_STRING(abi_version, S_IRUGO,
974 __stringify(IB_USER_MAD_ABI_VERSION));
975
976static dev_t overflow_maj;
977static DECLARE_BITMAP(overflow_map, IB_UMAD_MAX_PORTS);
978static int find_overflow_devnum(void)
979{
980 int ret;
981
982 if (!overflow_maj) {
983 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UMAD_MAX_PORTS * 2,
984 "infiniband_mad");
985 if (ret) {
986 printk(KERN_ERR "user_mad: couldn't register dynamic device number\n");
987 return ret;
988 }
989 }
990
991 ret = find_first_zero_bit(overflow_map, IB_UMAD_MAX_PORTS);
992 if (ret >= IB_UMAD_MAX_PORTS)
993 return -1;
994
995 return ret;
996}
997
998static int ib_umad_init_port(struct ib_device *device, int port_num,
999 struct ib_umad_port *port)
1000{
1001 int devnum;
1002 dev_t base;
1003
1004 spin_lock(&port_lock);
1005 devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
1006 if (devnum >= IB_UMAD_MAX_PORTS) {
1007 spin_unlock(&port_lock);
1008 devnum = find_overflow_devnum();
1009 if (devnum < 0)
1010 return -1;
1011
1012 spin_lock(&port_lock);
1013 port->dev_num = devnum + IB_UMAD_MAX_PORTS;
1014 base = devnum + overflow_maj;
1015 set_bit(devnum, overflow_map);
1016 } else {
1017 port->dev_num = devnum;
1018 base = devnum + base_dev;
1019 set_bit(devnum, dev_map);
1020 }
1021 spin_unlock(&port_lock);
1022
1023 port->ib_dev = device;
1024 port->port_num = port_num;
1025 sema_init(&port->sm_sem, 1);
1026 mutex_init(&port->file_mutex);
1027 INIT_LIST_HEAD(&port->file_list);
1028
1029 cdev_init(&port->cdev, &umad_fops);
1030 port->cdev.owner = THIS_MODULE;
1031 kobject_set_name(&port->cdev.kobj, "umad%d", port->dev_num);
1032 if (cdev_add(&port->cdev, base, 1))
1033 goto err_cdev;
1034
1035 port->dev = device_create(umad_class, device->dma_device,
1036 port->cdev.dev, port,
1037 "umad%d", port->dev_num);
1038 if (IS_ERR(port->dev))
1039 goto err_cdev;
1040
1041 if (device_create_file(port->dev, &dev_attr_ibdev))
1042 goto err_dev;
1043 if (device_create_file(port->dev, &dev_attr_port))
1044 goto err_dev;
1045
1046 base += IB_UMAD_MAX_PORTS;
1047 cdev_init(&port->sm_cdev, &umad_sm_fops);
1048 port->sm_cdev.owner = THIS_MODULE;
1049 kobject_set_name(&port->sm_cdev.kobj, "issm%d", port->dev_num);
1050 if (cdev_add(&port->sm_cdev, base, 1))
1051 goto err_sm_cdev;
1052
1053 port->sm_dev = device_create(umad_class, device->dma_device,
1054 port->sm_cdev.dev, port,
1055 "issm%d", port->dev_num);
1056 if (IS_ERR(port->sm_dev))
1057 goto err_sm_cdev;
1058
1059 if (device_create_file(port->sm_dev, &dev_attr_ibdev))
1060 goto err_sm_dev;
1061 if (device_create_file(port->sm_dev, &dev_attr_port))
1062 goto err_sm_dev;
1063
1064 return 0;
1065
1066err_sm_dev:
1067 device_destroy(umad_class, port->sm_cdev.dev);
1068
1069err_sm_cdev:
1070 cdev_del(&port->sm_cdev);
1071
1072err_dev:
1073 device_destroy(umad_class, port->cdev.dev);
1074
1075err_cdev:
1076 cdev_del(&port->cdev);
1077 if (port->dev_num < IB_UMAD_MAX_PORTS)
1078 clear_bit(devnum, dev_map);
1079 else
1080 clear_bit(devnum, overflow_map);
1081
1082 return -1;
1083}
1084
1085static void ib_umad_kill_port(struct ib_umad_port *port)
1086{
1087 struct ib_umad_file *file;
1088 int id;
1089
1090 dev_set_drvdata(port->dev, NULL);
1091 dev_set_drvdata(port->sm_dev, NULL);
1092
1093 device_destroy(umad_class, port->cdev.dev);
1094 device_destroy(umad_class, port->sm_cdev.dev);
1095
1096 cdev_del(&port->cdev);
1097 cdev_del(&port->sm_cdev);
1098
1099 mutex_lock(&port->file_mutex);
1100
1101 port->ib_dev = NULL;
1102
1103 list_for_each_entry(file, &port->file_list, port_list) {
1104 mutex_lock(&file->mutex);
1105 file->agents_dead = 1;
1106 mutex_unlock(&file->mutex);
1107
1108 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1109 if (file->agent[id])
1110 ib_unregister_mad_agent(file->agent[id]);
1111 }
1112
1113 mutex_unlock(&port->file_mutex);
1114
1115 if (port->dev_num < IB_UMAD_MAX_PORTS)
1116 clear_bit(port->dev_num, dev_map);
1117 else
1118 clear_bit(port->dev_num - IB_UMAD_MAX_PORTS, overflow_map);
1119}
1120
1121static void ib_umad_add_one(struct ib_device *device)
1122{
1123 struct ib_umad_device *umad_dev;
1124 int s, e, i;
1125
1126 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1127 return;
1128
1129 if (device->node_type == RDMA_NODE_IB_SWITCH)
1130 s = e = 0;
1131 else {
1132 s = 1;
1133 e = device->phys_port_cnt;
1134 }
1135
1136 umad_dev = kzalloc(sizeof *umad_dev +
1137 (e - s + 1) * sizeof (struct ib_umad_port),
1138 GFP_KERNEL);
1139 if (!umad_dev)
1140 return;
1141
1142 kref_init(&umad_dev->ref);
1143
1144 umad_dev->start_port = s;
1145 umad_dev->end_port = e;
1146
1147 for (i = s; i <= e; ++i) {
1148 umad_dev->port[i - s].umad_dev = umad_dev;
1149
1150 if (ib_umad_init_port(device, i, &umad_dev->port[i - s]))
1151 goto err;
1152 }
1153
1154 ib_set_client_data(device, &umad_client, umad_dev);
1155
1156 return;
1157
1158err:
1159 while (--i >= s)
1160 ib_umad_kill_port(&umad_dev->port[i - s]);
1161
1162 kref_put(&umad_dev->ref, ib_umad_release_dev);
1163}
1164
1165static void ib_umad_remove_one(struct ib_device *device)
1166{
1167 struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client);
1168 int i;
1169
1170 if (!umad_dev)
1171 return;
1172
1173 for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i)
1174 ib_umad_kill_port(&umad_dev->port[i]);
1175
1176 kref_put(&umad_dev->ref, ib_umad_release_dev);
1177}
1178
1179static char *umad_devnode(struct device *dev, mode_t *mode)
1180{
1181 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1182}
1183
1184static int __init ib_umad_init(void)
1185{
1186 int ret;
1187
1188 ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
1189 "infiniband_mad");
1190 if (ret) {
1191 printk(KERN_ERR "user_mad: couldn't register device number\n");
1192 goto out;
1193 }
1194
1195 umad_class = class_create(THIS_MODULE, "infiniband_mad");
1196 if (IS_ERR(umad_class)) {
1197 ret = PTR_ERR(umad_class);
1198 printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n");
1199 goto out_chrdev;
1200 }
1201
1202 umad_class->devnode = umad_devnode;
1203
1204 ret = class_create_file(umad_class, &class_attr_abi_version.attr);
1205 if (ret) {
1206 printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n");
1207 goto out_class;
1208 }
1209
1210 ret = ib_register_client(&umad_client);
1211 if (ret) {
1212 printk(KERN_ERR "user_mad: couldn't register ib_umad client\n");
1213 goto out_class;
1214 }
1215
1216 return 0;
1217
1218out_class:
1219 class_destroy(umad_class);
1220
1221out_chrdev:
1222 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1223
1224out:
1225 return ret;
1226}
1227
1228static void __exit ib_umad_cleanup(void)
1229{
1230 ib_unregister_client(&umad_client);
1231 class_destroy(umad_class);
1232 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1233 if (overflow_maj)
1234 unregister_chrdev_region(overflow_maj, IB_UMAD_MAX_PORTS * 2);
1235}
1236
1237module_init(ib_umad_init);
1238module_exit(ib_umad_cleanup);
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#define pr_fmt(fmt) "user_mad: " fmt
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/sched.h>
50#include <linux/semaphore.h>
51#include <linux/slab.h>
52#include <linux/nospec.h>
53
54#include <linux/uaccess.h>
55
56#include <rdma/ib_mad.h>
57#include <rdma/ib_user_mad.h>
58#include <rdma/rdma_netlink.h>
59
60#include "core_priv.h"
61
62MODULE_AUTHOR("Roland Dreier");
63MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");
64MODULE_LICENSE("Dual BSD/GPL");
65
66enum {
67 IB_UMAD_MAX_PORTS = RDMA_MAX_PORTS,
68 IB_UMAD_MAX_AGENTS = 32,
69
70 IB_UMAD_MAJOR = 231,
71 IB_UMAD_MINOR_BASE = 0,
72 IB_UMAD_NUM_FIXED_MINOR = 64,
73 IB_UMAD_NUM_DYNAMIC_MINOR = IB_UMAD_MAX_PORTS - IB_UMAD_NUM_FIXED_MINOR,
74 IB_ISSM_MINOR_BASE = IB_UMAD_NUM_FIXED_MINOR,
75};
76
77/*
78 * Our lifetime rules for these structs are the following:
79 * device special file is opened, we take a reference on the
80 * ib_umad_port's struct ib_umad_device. We drop these
81 * references in the corresponding close().
82 *
83 * In addition to references coming from open character devices, there
84 * is one more reference to each ib_umad_device representing the
85 * module's reference taken when allocating the ib_umad_device in
86 * ib_umad_add_one().
87 *
88 * When destroying an ib_umad_device, we drop the module's reference.
89 */
90
91struct ib_umad_port {
92 struct cdev cdev;
93 struct device dev;
94 struct cdev sm_cdev;
95 struct device sm_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 u32 port_num;
105};
106
107struct ib_umad_device {
108 struct kref kref;
109 struct ib_umad_port ports[];
110};
111
112struct ib_umad_file {
113 struct mutex mutex;
114 struct ib_umad_port *port;
115 struct list_head recv_list;
116 struct list_head send_list;
117 struct list_head port_list;
118 spinlock_t send_lock;
119 wait_queue_head_t recv_wait;
120 struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS];
121 int agents_dead;
122 u8 use_pkey_index;
123 u8 already_used;
124};
125
126struct ib_umad_packet {
127 struct ib_mad_send_buf *msg;
128 struct ib_mad_recv_wc *recv_wc;
129 struct list_head list;
130 int length;
131 struct ib_user_mad mad;
132};
133
134struct ib_rmpp_mad_hdr {
135 struct ib_mad_hdr mad_hdr;
136 struct ib_rmpp_hdr rmpp_hdr;
137} __packed;
138
139#define CREATE_TRACE_POINTS
140#include <trace/events/ib_umad.h>
141
142static const dev_t base_umad_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
143static const dev_t base_issm_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE) +
144 IB_UMAD_NUM_FIXED_MINOR;
145static dev_t dynamic_umad_dev;
146static dev_t dynamic_issm_dev;
147
148static DEFINE_IDA(umad_ida);
149
150static int ib_umad_add_one(struct ib_device *device);
151static void ib_umad_remove_one(struct ib_device *device, void *client_data);
152
153static void ib_umad_dev_free(struct kref *kref)
154{
155 struct ib_umad_device *dev =
156 container_of(kref, struct ib_umad_device, kref);
157
158 kfree(dev);
159}
160
161static void ib_umad_dev_get(struct ib_umad_device *dev)
162{
163 kref_get(&dev->kref);
164}
165
166static void ib_umad_dev_put(struct ib_umad_device *dev)
167{
168 kref_put(&dev->kref, ib_umad_dev_free);
169}
170
171static int hdr_size(struct ib_umad_file *file)
172{
173 return file->use_pkey_index ? sizeof(struct ib_user_mad_hdr) :
174 sizeof(struct ib_user_mad_hdr_old);
175}
176
177/* caller must hold file->mutex */
178static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
179{
180 return file->agents_dead ? NULL : file->agent[id];
181}
182
183static int queue_packet(struct ib_umad_file *file,
184 struct ib_mad_agent *agent,
185 struct ib_umad_packet *packet)
186{
187 int ret = 1;
188
189 mutex_lock(&file->mutex);
190
191 for (packet->mad.hdr.id = 0;
192 packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
193 packet->mad.hdr.id++)
194 if (agent == __get_agent(file, packet->mad.hdr.id)) {
195 list_add_tail(&packet->list, &file->recv_list);
196 wake_up_interruptible(&file->recv_wait);
197 ret = 0;
198 break;
199 }
200
201 mutex_unlock(&file->mutex);
202
203 return ret;
204}
205
206static void dequeue_send(struct ib_umad_file *file,
207 struct ib_umad_packet *packet)
208{
209 spin_lock_irq(&file->send_lock);
210 list_del(&packet->list);
211 spin_unlock_irq(&file->send_lock);
212}
213
214static void send_handler(struct ib_mad_agent *agent,
215 struct ib_mad_send_wc *send_wc)
216{
217 struct ib_umad_file *file = agent->context;
218 struct ib_umad_packet *packet = send_wc->send_buf->context[0];
219
220 dequeue_send(file, packet);
221 rdma_destroy_ah(packet->msg->ah, RDMA_DESTROY_AH_SLEEPABLE);
222 ib_free_send_mad(packet->msg);
223
224 if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
225 packet->length = IB_MGMT_MAD_HDR;
226 packet->mad.hdr.status = ETIMEDOUT;
227 if (!queue_packet(file, agent, packet))
228 return;
229 }
230 kfree(packet);
231}
232
233static void recv_handler(struct ib_mad_agent *agent,
234 struct ib_mad_send_buf *send_buf,
235 struct ib_mad_recv_wc *mad_recv_wc)
236{
237 struct ib_umad_file *file = agent->context;
238 struct ib_umad_packet *packet;
239
240 if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
241 goto err1;
242
243 packet = kzalloc(sizeof *packet, GFP_KERNEL);
244 if (!packet)
245 goto err1;
246
247 packet->length = mad_recv_wc->mad_len;
248 packet->recv_wc = mad_recv_wc;
249
250 packet->mad.hdr.status = 0;
251 packet->mad.hdr.length = hdr_size(file) + mad_recv_wc->mad_len;
252 packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp);
253 /*
254 * On OPA devices it is okay to lose the upper 16 bits of LID as this
255 * information is obtained elsewhere. Mask off the upper 16 bits.
256 */
257 if (rdma_cap_opa_mad(agent->device, agent->port_num))
258 packet->mad.hdr.lid = ib_lid_be16(0xFFFF &
259 mad_recv_wc->wc->slid);
260 else
261 packet->mad.hdr.lid = ib_lid_be16(mad_recv_wc->wc->slid);
262 packet->mad.hdr.sl = mad_recv_wc->wc->sl;
263 packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits;
264 packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;
265 packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
266 if (packet->mad.hdr.grh_present) {
267 struct rdma_ah_attr ah_attr;
268 const struct ib_global_route *grh;
269 int ret;
270
271 ret = ib_init_ah_attr_from_wc(agent->device, agent->port_num,
272 mad_recv_wc->wc,
273 mad_recv_wc->recv_buf.grh,
274 &ah_attr);
275 if (ret)
276 goto err2;
277
278 grh = rdma_ah_read_grh(&ah_attr);
279 packet->mad.hdr.gid_index = grh->sgid_index;
280 packet->mad.hdr.hop_limit = grh->hop_limit;
281 packet->mad.hdr.traffic_class = grh->traffic_class;
282 memcpy(packet->mad.hdr.gid, &grh->dgid, 16);
283 packet->mad.hdr.flow_label = cpu_to_be32(grh->flow_label);
284 rdma_destroy_ah_attr(&ah_attr);
285 }
286
287 if (queue_packet(file, agent, packet))
288 goto err2;
289 return;
290
291err2:
292 kfree(packet);
293err1:
294 ib_free_recv_mad(mad_recv_wc);
295}
296
297static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
298 struct ib_umad_packet *packet, size_t count)
299{
300 struct ib_mad_recv_buf *recv_buf;
301 int left, seg_payload, offset, max_seg_payload;
302 size_t seg_size;
303
304 recv_buf = &packet->recv_wc->recv_buf;
305 seg_size = packet->recv_wc->mad_seg_size;
306
307 /* We need enough room to copy the first (or only) MAD segment. */
308 if ((packet->length <= seg_size &&
309 count < hdr_size(file) + packet->length) ||
310 (packet->length > seg_size &&
311 count < hdr_size(file) + seg_size))
312 return -EINVAL;
313
314 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
315 return -EFAULT;
316
317 buf += hdr_size(file);
318 seg_payload = min_t(int, packet->length, seg_size);
319 if (copy_to_user(buf, recv_buf->mad, seg_payload))
320 return -EFAULT;
321
322 if (seg_payload < packet->length) {
323 /*
324 * Multipacket RMPP MAD message. Copy remainder of message.
325 * Note that last segment may have a shorter payload.
326 */
327 if (count < hdr_size(file) + packet->length) {
328 /*
329 * The buffer is too small, return the first RMPP segment,
330 * which includes the RMPP message length.
331 */
332 return -ENOSPC;
333 }
334 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
335 max_seg_payload = seg_size - offset;
336
337 for (left = packet->length - seg_payload, buf += seg_payload;
338 left; left -= seg_payload, buf += seg_payload) {
339 recv_buf = container_of(recv_buf->list.next,
340 struct ib_mad_recv_buf, list);
341 seg_payload = min(left, max_seg_payload);
342 if (copy_to_user(buf, ((void *) recv_buf->mad) + offset,
343 seg_payload))
344 return -EFAULT;
345 }
346 }
347
348 trace_ib_umad_read_recv(file, &packet->mad.hdr, &recv_buf->mad->mad_hdr);
349
350 return hdr_size(file) + packet->length;
351}
352
353static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
354 struct ib_umad_packet *packet, size_t count)
355{
356 ssize_t size = hdr_size(file) + packet->length;
357
358 if (count < size)
359 return -EINVAL;
360
361 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
362 return -EFAULT;
363
364 buf += hdr_size(file);
365
366 if (copy_to_user(buf, packet->mad.data, packet->length))
367 return -EFAULT;
368
369 trace_ib_umad_read_send(file, &packet->mad.hdr,
370 (struct ib_mad_hdr *)&packet->mad.data);
371
372 return size;
373}
374
375static ssize_t ib_umad_read(struct file *filp, char __user *buf,
376 size_t count, loff_t *pos)
377{
378 struct ib_umad_file *file = filp->private_data;
379 struct ib_umad_packet *packet;
380 ssize_t ret;
381
382 if (count < hdr_size(file))
383 return -EINVAL;
384
385 mutex_lock(&file->mutex);
386
387 if (file->agents_dead) {
388 mutex_unlock(&file->mutex);
389 return -EIO;
390 }
391
392 while (list_empty(&file->recv_list)) {
393 mutex_unlock(&file->mutex);
394
395 if (filp->f_flags & O_NONBLOCK)
396 return -EAGAIN;
397
398 if (wait_event_interruptible(file->recv_wait,
399 !list_empty(&file->recv_list)))
400 return -ERESTARTSYS;
401
402 mutex_lock(&file->mutex);
403 }
404
405 if (file->agents_dead) {
406 mutex_unlock(&file->mutex);
407 return -EIO;
408 }
409
410 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
411 list_del(&packet->list);
412
413 mutex_unlock(&file->mutex);
414
415 if (packet->recv_wc)
416 ret = copy_recv_mad(file, buf, packet, count);
417 else
418 ret = copy_send_mad(file, buf, packet, count);
419
420 if (ret < 0) {
421 /* Requeue packet */
422 mutex_lock(&file->mutex);
423 list_add(&packet->list, &file->recv_list);
424 mutex_unlock(&file->mutex);
425 } else {
426 if (packet->recv_wc)
427 ib_free_recv_mad(packet->recv_wc);
428 kfree(packet);
429 }
430 return ret;
431}
432
433static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
434{
435 int left, seg;
436
437 /* Copy class specific header */
438 if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
439 copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
440 msg->hdr_len - IB_MGMT_RMPP_HDR))
441 return -EFAULT;
442
443 /* All headers are in place. Copy data segments. */
444 for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
445 seg++, left -= msg->seg_size, buf += msg->seg_size) {
446 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
447 min(left, msg->seg_size)))
448 return -EFAULT;
449 }
450 return 0;
451}
452
453static int same_destination(struct ib_user_mad_hdr *hdr1,
454 struct ib_user_mad_hdr *hdr2)
455{
456 if (!hdr1->grh_present && !hdr2->grh_present)
457 return (hdr1->lid == hdr2->lid);
458
459 if (hdr1->grh_present && hdr2->grh_present)
460 return !memcmp(hdr1->gid, hdr2->gid, 16);
461
462 return 0;
463}
464
465static int is_duplicate(struct ib_umad_file *file,
466 struct ib_umad_packet *packet)
467{
468 struct ib_umad_packet *sent_packet;
469 struct ib_mad_hdr *sent_hdr, *hdr;
470
471 hdr = (struct ib_mad_hdr *) packet->mad.data;
472 list_for_each_entry(sent_packet, &file->send_list, list) {
473 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
474
475 if ((hdr->tid != sent_hdr->tid) ||
476 (hdr->mgmt_class != sent_hdr->mgmt_class))
477 continue;
478
479 /*
480 * No need to be overly clever here. If two new operations have
481 * the same TID, reject the second as a duplicate. This is more
482 * restrictive than required by the spec.
483 */
484 if (!ib_response_mad(hdr)) {
485 if (!ib_response_mad(sent_hdr))
486 return 1;
487 continue;
488 } else if (!ib_response_mad(sent_hdr))
489 continue;
490
491 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
492 return 1;
493 }
494
495 return 0;
496}
497
498static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
499 size_t count, loff_t *pos)
500{
501 struct ib_umad_file *file = filp->private_data;
502 struct ib_rmpp_mad_hdr *rmpp_mad_hdr;
503 struct ib_umad_packet *packet;
504 struct ib_mad_agent *agent;
505 struct rdma_ah_attr ah_attr;
506 struct ib_ah *ah;
507 __be64 *tid;
508 int ret, data_len, hdr_len, copy_offset, rmpp_active;
509 u8 base_version;
510
511 if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
512 return -EINVAL;
513
514 packet = kzalloc(sizeof(*packet) + IB_MGMT_RMPP_HDR, GFP_KERNEL);
515 if (!packet)
516 return -ENOMEM;
517
518 if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
519 ret = -EFAULT;
520 goto err;
521 }
522
523 if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
524 ret = -EINVAL;
525 goto err;
526 }
527
528 buf += hdr_size(file);
529
530 if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
531 ret = -EFAULT;
532 goto err;
533 }
534
535 mutex_lock(&file->mutex);
536
537 trace_ib_umad_write(file, &packet->mad.hdr,
538 (struct ib_mad_hdr *)&packet->mad.data);
539
540 agent = __get_agent(file, packet->mad.hdr.id);
541 if (!agent) {
542 ret = -EIO;
543 goto err_up;
544 }
545
546 memset(&ah_attr, 0, sizeof ah_attr);
547 ah_attr.type = rdma_ah_find_type(agent->device,
548 file->port->port_num);
549 rdma_ah_set_dlid(&ah_attr, be16_to_cpu(packet->mad.hdr.lid));
550 rdma_ah_set_sl(&ah_attr, packet->mad.hdr.sl);
551 rdma_ah_set_path_bits(&ah_attr, packet->mad.hdr.path_bits);
552 rdma_ah_set_port_num(&ah_attr, file->port->port_num);
553 if (packet->mad.hdr.grh_present) {
554 rdma_ah_set_grh(&ah_attr, NULL,
555 be32_to_cpu(packet->mad.hdr.flow_label),
556 packet->mad.hdr.gid_index,
557 packet->mad.hdr.hop_limit,
558 packet->mad.hdr.traffic_class);
559 rdma_ah_set_dgid_raw(&ah_attr, packet->mad.hdr.gid);
560 }
561
562 ah = rdma_create_user_ah(agent->qp->pd, &ah_attr, NULL);
563 if (IS_ERR(ah)) {
564 ret = PTR_ERR(ah);
565 goto err_up;
566 }
567
568 rmpp_mad_hdr = (struct ib_rmpp_mad_hdr *)packet->mad.data;
569 hdr_len = ib_get_mad_data_offset(rmpp_mad_hdr->mad_hdr.mgmt_class);
570
571 if (ib_is_mad_class_rmpp(rmpp_mad_hdr->mad_hdr.mgmt_class)
572 && ib_mad_kernel_rmpp_agent(agent)) {
573 copy_offset = IB_MGMT_RMPP_HDR;
574 rmpp_active = ib_get_rmpp_flags(&rmpp_mad_hdr->rmpp_hdr) &
575 IB_MGMT_RMPP_FLAG_ACTIVE;
576 } else {
577 copy_offset = IB_MGMT_MAD_HDR;
578 rmpp_active = 0;
579 }
580
581 base_version = ((struct ib_mad_hdr *)&packet->mad.data)->base_version;
582 data_len = count - hdr_size(file) - hdr_len;
583 packet->msg = ib_create_send_mad(agent,
584 be32_to_cpu(packet->mad.hdr.qpn),
585 packet->mad.hdr.pkey_index, rmpp_active,
586 hdr_len, data_len, GFP_KERNEL,
587 base_version);
588 if (IS_ERR(packet->msg)) {
589 ret = PTR_ERR(packet->msg);
590 goto err_ah;
591 }
592
593 packet->msg->ah = ah;
594 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
595 packet->msg->retries = packet->mad.hdr.retries;
596 packet->msg->context[0] = packet;
597
598 /* Copy MAD header. Any RMPP header is already in place. */
599 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
600
601 if (!rmpp_active) {
602 if (copy_from_user(packet->msg->mad + copy_offset,
603 buf + copy_offset,
604 hdr_len + data_len - copy_offset)) {
605 ret = -EFAULT;
606 goto err_msg;
607 }
608 } else {
609 ret = copy_rmpp_mad(packet->msg, buf);
610 if (ret)
611 goto err_msg;
612 }
613
614 /*
615 * Set the high-order part of the transaction ID to make MADs from
616 * different agents unique, and allow routing responses back to the
617 * original requestor.
618 */
619 if (!ib_response_mad(packet->msg->mad)) {
620 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
621 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
622 (be64_to_cpup(tid) & 0xffffffff));
623 rmpp_mad_hdr->mad_hdr.tid = *tid;
624 }
625
626 if (!ib_mad_kernel_rmpp_agent(agent)
627 && ib_is_mad_class_rmpp(rmpp_mad_hdr->mad_hdr.mgmt_class)
628 && (ib_get_rmpp_flags(&rmpp_mad_hdr->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE)) {
629 spin_lock_irq(&file->send_lock);
630 list_add_tail(&packet->list, &file->send_list);
631 spin_unlock_irq(&file->send_lock);
632 } else {
633 spin_lock_irq(&file->send_lock);
634 ret = is_duplicate(file, packet);
635 if (!ret)
636 list_add_tail(&packet->list, &file->send_list);
637 spin_unlock_irq(&file->send_lock);
638 if (ret) {
639 ret = -EINVAL;
640 goto err_msg;
641 }
642 }
643
644 ret = ib_post_send_mad(packet->msg, NULL);
645 if (ret)
646 goto err_send;
647
648 mutex_unlock(&file->mutex);
649 return count;
650
651err_send:
652 dequeue_send(file, packet);
653err_msg:
654 ib_free_send_mad(packet->msg);
655err_ah:
656 rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);
657err_up:
658 mutex_unlock(&file->mutex);
659err:
660 kfree(packet);
661 return ret;
662}
663
664static __poll_t ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
665{
666 struct ib_umad_file *file = filp->private_data;
667
668 /* we will always be able to post a MAD send */
669 __poll_t mask = EPOLLOUT | EPOLLWRNORM;
670
671 mutex_lock(&file->mutex);
672 poll_wait(filp, &file->recv_wait, wait);
673
674 if (!list_empty(&file->recv_list))
675 mask |= EPOLLIN | EPOLLRDNORM;
676 if (file->agents_dead)
677 mask = EPOLLERR;
678 mutex_unlock(&file->mutex);
679
680 return mask;
681}
682
683static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
684 int compat_method_mask)
685{
686 struct ib_user_mad_reg_req ureq;
687 struct ib_mad_reg_req req;
688 struct ib_mad_agent *agent = NULL;
689 int agent_id;
690 int ret;
691
692 mutex_lock(&file->port->file_mutex);
693 mutex_lock(&file->mutex);
694
695 if (!file->port->ib_dev) {
696 dev_notice(&file->port->dev, "%s: invalid device\n", __func__);
697 ret = -EPIPE;
698 goto out;
699 }
700
701 if (copy_from_user(&ureq, arg, sizeof ureq)) {
702 ret = -EFAULT;
703 goto out;
704 }
705
706 if (ureq.qpn != 0 && ureq.qpn != 1) {
707 dev_notice(&file->port->dev,
708 "%s: invalid QPN %u specified\n", __func__,
709 ureq.qpn);
710 ret = -EINVAL;
711 goto out;
712 }
713
714 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
715 if (!__get_agent(file, agent_id))
716 goto found;
717
718 dev_notice(&file->port->dev, "%s: Max Agents (%u) reached\n", __func__,
719 IB_UMAD_MAX_AGENTS);
720
721 ret = -ENOMEM;
722 goto out;
723
724found:
725 if (ureq.mgmt_class) {
726 memset(&req, 0, sizeof(req));
727 req.mgmt_class = ureq.mgmt_class;
728 req.mgmt_class_version = ureq.mgmt_class_version;
729 memcpy(req.oui, ureq.oui, sizeof req.oui);
730
731 if (compat_method_mask) {
732 u32 *umm = (u32 *) ureq.method_mask;
733 int i;
734
735 for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
736 req.method_mask[i] =
737 umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
738 } else
739 memcpy(req.method_mask, ureq.method_mask,
740 sizeof req.method_mask);
741 }
742
743 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
744 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
745 ureq.mgmt_class ? &req : NULL,
746 ureq.rmpp_version,
747 send_handler, recv_handler, file, 0);
748 if (IS_ERR(agent)) {
749 ret = PTR_ERR(agent);
750 agent = NULL;
751 goto out;
752 }
753
754 if (put_user(agent_id,
755 (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
756 ret = -EFAULT;
757 goto out;
758 }
759
760 if (!file->already_used) {
761 file->already_used = 1;
762 if (!file->use_pkey_index) {
763 dev_warn(&file->port->dev,
764 "process %s did not enable P_Key index support.\n",
765 current->comm);
766 dev_warn(&file->port->dev,
767 " Documentation/infiniband/user_mad.rst has info on the new ABI.\n");
768 }
769 }
770
771 file->agent[agent_id] = agent;
772 ret = 0;
773
774out:
775 mutex_unlock(&file->mutex);
776
777 if (ret && agent)
778 ib_unregister_mad_agent(agent);
779
780 mutex_unlock(&file->port->file_mutex);
781
782 return ret;
783}
784
785static int ib_umad_reg_agent2(struct ib_umad_file *file, void __user *arg)
786{
787 struct ib_user_mad_reg_req2 ureq;
788 struct ib_mad_reg_req req;
789 struct ib_mad_agent *agent = NULL;
790 int agent_id;
791 int ret;
792
793 mutex_lock(&file->port->file_mutex);
794 mutex_lock(&file->mutex);
795
796 if (!file->port->ib_dev) {
797 dev_notice(&file->port->dev, "%s: invalid device\n", __func__);
798 ret = -EPIPE;
799 goto out;
800 }
801
802 if (copy_from_user(&ureq, arg, sizeof(ureq))) {
803 ret = -EFAULT;
804 goto out;
805 }
806
807 if (ureq.qpn != 0 && ureq.qpn != 1) {
808 dev_notice(&file->port->dev, "%s: invalid QPN %u specified\n",
809 __func__, ureq.qpn);
810 ret = -EINVAL;
811 goto out;
812 }
813
814 if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) {
815 dev_notice(&file->port->dev,
816 "%s failed: invalid registration flags specified 0x%x; supported 0x%x\n",
817 __func__, ureq.flags, IB_USER_MAD_REG_FLAGS_CAP);
818 ret = -EINVAL;
819
820 if (put_user((u32)IB_USER_MAD_REG_FLAGS_CAP,
821 (u32 __user *) (arg + offsetof(struct
822 ib_user_mad_reg_req2, flags))))
823 ret = -EFAULT;
824
825 goto out;
826 }
827
828 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
829 if (!__get_agent(file, agent_id))
830 goto found;
831
832 dev_notice(&file->port->dev, "%s: Max Agents (%u) reached\n", __func__,
833 IB_UMAD_MAX_AGENTS);
834 ret = -ENOMEM;
835 goto out;
836
837found:
838 if (ureq.mgmt_class) {
839 memset(&req, 0, sizeof(req));
840 req.mgmt_class = ureq.mgmt_class;
841 req.mgmt_class_version = ureq.mgmt_class_version;
842 if (ureq.oui & 0xff000000) {
843 dev_notice(&file->port->dev,
844 "%s failed: oui invalid 0x%08x\n", __func__,
845 ureq.oui);
846 ret = -EINVAL;
847 goto out;
848 }
849 req.oui[2] = ureq.oui & 0x0000ff;
850 req.oui[1] = (ureq.oui & 0x00ff00) >> 8;
851 req.oui[0] = (ureq.oui & 0xff0000) >> 16;
852 memcpy(req.method_mask, ureq.method_mask,
853 sizeof(req.method_mask));
854 }
855
856 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
857 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
858 ureq.mgmt_class ? &req : NULL,
859 ureq.rmpp_version,
860 send_handler, recv_handler, file,
861 ureq.flags);
862 if (IS_ERR(agent)) {
863 ret = PTR_ERR(agent);
864 agent = NULL;
865 goto out;
866 }
867
868 if (put_user(agent_id,
869 (u32 __user *)(arg +
870 offsetof(struct ib_user_mad_reg_req2, id)))) {
871 ret = -EFAULT;
872 goto out;
873 }
874
875 if (!file->already_used) {
876 file->already_used = 1;
877 file->use_pkey_index = 1;
878 }
879
880 file->agent[agent_id] = agent;
881 ret = 0;
882
883out:
884 mutex_unlock(&file->mutex);
885
886 if (ret && agent)
887 ib_unregister_mad_agent(agent);
888
889 mutex_unlock(&file->port->file_mutex);
890
891 return ret;
892}
893
894
895static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
896{
897 struct ib_mad_agent *agent = NULL;
898 u32 id;
899 int ret = 0;
900
901 if (get_user(id, arg))
902 return -EFAULT;
903 if (id >= IB_UMAD_MAX_AGENTS)
904 return -EINVAL;
905
906 mutex_lock(&file->port->file_mutex);
907 mutex_lock(&file->mutex);
908
909 id = array_index_nospec(id, IB_UMAD_MAX_AGENTS);
910 if (!__get_agent(file, id)) {
911 ret = -EINVAL;
912 goto out;
913 }
914
915 agent = file->agent[id];
916 file->agent[id] = NULL;
917
918out:
919 mutex_unlock(&file->mutex);
920
921 if (agent)
922 ib_unregister_mad_agent(agent);
923
924 mutex_unlock(&file->port->file_mutex);
925
926 return ret;
927}
928
929static long ib_umad_enable_pkey(struct ib_umad_file *file)
930{
931 int ret = 0;
932
933 mutex_lock(&file->mutex);
934 if (file->already_used)
935 ret = -EINVAL;
936 else
937 file->use_pkey_index = 1;
938 mutex_unlock(&file->mutex);
939
940 return ret;
941}
942
943static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
944 unsigned long arg)
945{
946 switch (cmd) {
947 case IB_USER_MAD_REGISTER_AGENT:
948 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
949 case IB_USER_MAD_UNREGISTER_AGENT:
950 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
951 case IB_USER_MAD_ENABLE_PKEY:
952 return ib_umad_enable_pkey(filp->private_data);
953 case IB_USER_MAD_REGISTER_AGENT2:
954 return ib_umad_reg_agent2(filp->private_data, (void __user *) arg);
955 default:
956 return -ENOIOCTLCMD;
957 }
958}
959
960#ifdef CONFIG_COMPAT
961static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
962 unsigned long arg)
963{
964 switch (cmd) {
965 case IB_USER_MAD_REGISTER_AGENT:
966 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
967 case IB_USER_MAD_UNREGISTER_AGENT:
968 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
969 case IB_USER_MAD_ENABLE_PKEY:
970 return ib_umad_enable_pkey(filp->private_data);
971 case IB_USER_MAD_REGISTER_AGENT2:
972 return ib_umad_reg_agent2(filp->private_data, compat_ptr(arg));
973 default:
974 return -ENOIOCTLCMD;
975 }
976}
977#endif
978
979/*
980 * ib_umad_open() does not need the BKL:
981 *
982 * - the ib_umad_port structures are properly reference counted, and
983 * everything else is purely local to the file being created, so
984 * races against other open calls are not a problem;
985 * - the ioctl method does not affect any global state outside of the
986 * file structure being operated on;
987 */
988static int ib_umad_open(struct inode *inode, struct file *filp)
989{
990 struct ib_umad_port *port;
991 struct ib_umad_file *file;
992 int ret = 0;
993
994 port = container_of(inode->i_cdev, struct ib_umad_port, cdev);
995
996 mutex_lock(&port->file_mutex);
997
998 if (!port->ib_dev) {
999 ret = -ENXIO;
1000 goto out;
1001 }
1002
1003 if (!rdma_dev_access_netns(port->ib_dev, current->nsproxy->net_ns)) {
1004 ret = -EPERM;
1005 goto out;
1006 }
1007
1008 file = kzalloc(sizeof(*file), GFP_KERNEL);
1009 if (!file) {
1010 ret = -ENOMEM;
1011 goto out;
1012 }
1013
1014 mutex_init(&file->mutex);
1015 spin_lock_init(&file->send_lock);
1016 INIT_LIST_HEAD(&file->recv_list);
1017 INIT_LIST_HEAD(&file->send_list);
1018 init_waitqueue_head(&file->recv_wait);
1019
1020 file->port = port;
1021 filp->private_data = file;
1022
1023 list_add_tail(&file->port_list, &port->file_list);
1024
1025 stream_open(inode, filp);
1026out:
1027 mutex_unlock(&port->file_mutex);
1028 return ret;
1029}
1030
1031static int ib_umad_close(struct inode *inode, struct file *filp)
1032{
1033 struct ib_umad_file *file = filp->private_data;
1034 struct ib_umad_packet *packet, *tmp;
1035 int already_dead;
1036 int i;
1037
1038 mutex_lock(&file->port->file_mutex);
1039 mutex_lock(&file->mutex);
1040
1041 already_dead = file->agents_dead;
1042 file->agents_dead = 1;
1043
1044 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
1045 if (packet->recv_wc)
1046 ib_free_recv_mad(packet->recv_wc);
1047 kfree(packet);
1048 }
1049
1050 list_del(&file->port_list);
1051
1052 mutex_unlock(&file->mutex);
1053
1054 if (!already_dead)
1055 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
1056 if (file->agent[i])
1057 ib_unregister_mad_agent(file->agent[i]);
1058
1059 mutex_unlock(&file->port->file_mutex);
1060 mutex_destroy(&file->mutex);
1061 kfree(file);
1062 return 0;
1063}
1064
1065static const struct file_operations umad_fops = {
1066 .owner = THIS_MODULE,
1067 .read = ib_umad_read,
1068 .write = ib_umad_write,
1069 .poll = ib_umad_poll,
1070 .unlocked_ioctl = ib_umad_ioctl,
1071#ifdef CONFIG_COMPAT
1072 .compat_ioctl = ib_umad_compat_ioctl,
1073#endif
1074 .open = ib_umad_open,
1075 .release = ib_umad_close,
1076 .llseek = no_llseek,
1077};
1078
1079static int ib_umad_sm_open(struct inode *inode, struct file *filp)
1080{
1081 struct ib_umad_port *port;
1082 struct ib_port_modify props = {
1083 .set_port_cap_mask = IB_PORT_SM
1084 };
1085 int ret;
1086
1087 port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev);
1088
1089 if (filp->f_flags & O_NONBLOCK) {
1090 if (down_trylock(&port->sm_sem)) {
1091 ret = -EAGAIN;
1092 goto fail;
1093 }
1094 } else {
1095 if (down_interruptible(&port->sm_sem)) {
1096 ret = -ERESTARTSYS;
1097 goto fail;
1098 }
1099 }
1100
1101 if (!rdma_dev_access_netns(port->ib_dev, current->nsproxy->net_ns)) {
1102 ret = -EPERM;
1103 goto err_up_sem;
1104 }
1105
1106 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1107 if (ret)
1108 goto err_up_sem;
1109
1110 filp->private_data = port;
1111
1112 nonseekable_open(inode, filp);
1113 return 0;
1114
1115err_up_sem:
1116 up(&port->sm_sem);
1117
1118fail:
1119 return ret;
1120}
1121
1122static int ib_umad_sm_close(struct inode *inode, struct file *filp)
1123{
1124 struct ib_umad_port *port = filp->private_data;
1125 struct ib_port_modify props = {
1126 .clr_port_cap_mask = IB_PORT_SM
1127 };
1128 int ret = 0;
1129
1130 mutex_lock(&port->file_mutex);
1131 if (port->ib_dev)
1132 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1133 mutex_unlock(&port->file_mutex);
1134
1135 up(&port->sm_sem);
1136
1137 return ret;
1138}
1139
1140static const struct file_operations umad_sm_fops = {
1141 .owner = THIS_MODULE,
1142 .open = ib_umad_sm_open,
1143 .release = ib_umad_sm_close,
1144 .llseek = no_llseek,
1145};
1146
1147static struct ib_umad_port *get_port(struct ib_device *ibdev,
1148 struct ib_umad_device *umad_dev,
1149 u32 port)
1150{
1151 if (!umad_dev)
1152 return ERR_PTR(-EOPNOTSUPP);
1153 if (!rdma_is_port_valid(ibdev, port))
1154 return ERR_PTR(-EINVAL);
1155 if (!rdma_cap_ib_mad(ibdev, port))
1156 return ERR_PTR(-EOPNOTSUPP);
1157
1158 return &umad_dev->ports[port - rdma_start_port(ibdev)];
1159}
1160
1161static int ib_umad_get_nl_info(struct ib_device *ibdev, void *client_data,
1162 struct ib_client_nl_info *res)
1163{
1164 struct ib_umad_port *port = get_port(ibdev, client_data, res->port);
1165
1166 if (IS_ERR(port))
1167 return PTR_ERR(port);
1168
1169 res->abi = IB_USER_MAD_ABI_VERSION;
1170 res->cdev = &port->dev;
1171 return 0;
1172}
1173
1174static struct ib_client umad_client = {
1175 .name = "umad",
1176 .add = ib_umad_add_one,
1177 .remove = ib_umad_remove_one,
1178 .get_nl_info = ib_umad_get_nl_info,
1179};
1180MODULE_ALIAS_RDMA_CLIENT("umad");
1181
1182static int ib_issm_get_nl_info(struct ib_device *ibdev, void *client_data,
1183 struct ib_client_nl_info *res)
1184{
1185 struct ib_umad_port *port = get_port(ibdev, client_data, res->port);
1186
1187 if (IS_ERR(port))
1188 return PTR_ERR(port);
1189
1190 res->abi = IB_USER_MAD_ABI_VERSION;
1191 res->cdev = &port->sm_dev;
1192 return 0;
1193}
1194
1195static struct ib_client issm_client = {
1196 .name = "issm",
1197 .get_nl_info = ib_issm_get_nl_info,
1198};
1199MODULE_ALIAS_RDMA_CLIENT("issm");
1200
1201static ssize_t ibdev_show(struct device *dev, struct device_attribute *attr,
1202 char *buf)
1203{
1204 struct ib_umad_port *port = dev_get_drvdata(dev);
1205
1206 if (!port)
1207 return -ENODEV;
1208
1209 return sysfs_emit(buf, "%s\n", dev_name(&port->ib_dev->dev));
1210}
1211static DEVICE_ATTR_RO(ibdev);
1212
1213static ssize_t port_show(struct device *dev, struct device_attribute *attr,
1214 char *buf)
1215{
1216 struct ib_umad_port *port = dev_get_drvdata(dev);
1217
1218 if (!port)
1219 return -ENODEV;
1220
1221 return sysfs_emit(buf, "%d\n", port->port_num);
1222}
1223static DEVICE_ATTR_RO(port);
1224
1225static struct attribute *umad_class_dev_attrs[] = {
1226 &dev_attr_ibdev.attr,
1227 &dev_attr_port.attr,
1228 NULL,
1229};
1230ATTRIBUTE_GROUPS(umad_class_dev);
1231
1232static char *umad_devnode(const struct device *dev, umode_t *mode)
1233{
1234 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1235}
1236
1237static ssize_t abi_version_show(const struct class *class,
1238 const struct class_attribute *attr, char *buf)
1239{
1240 return sysfs_emit(buf, "%d\n", IB_USER_MAD_ABI_VERSION);
1241}
1242static CLASS_ATTR_RO(abi_version);
1243
1244static struct attribute *umad_class_attrs[] = {
1245 &class_attr_abi_version.attr,
1246 NULL,
1247};
1248ATTRIBUTE_GROUPS(umad_class);
1249
1250static struct class umad_class = {
1251 .name = "infiniband_mad",
1252 .devnode = umad_devnode,
1253 .class_groups = umad_class_groups,
1254 .dev_groups = umad_class_dev_groups,
1255};
1256
1257static void ib_umad_release_port(struct device *device)
1258{
1259 struct ib_umad_port *port = dev_get_drvdata(device);
1260 struct ib_umad_device *umad_dev = port->umad_dev;
1261
1262 ib_umad_dev_put(umad_dev);
1263}
1264
1265static void ib_umad_init_port_dev(struct device *dev,
1266 struct ib_umad_port *port,
1267 const struct ib_device *device)
1268{
1269 device_initialize(dev);
1270 ib_umad_dev_get(port->umad_dev);
1271 dev->class = &umad_class;
1272 dev->parent = device->dev.parent;
1273 dev_set_drvdata(dev, port);
1274 dev->release = ib_umad_release_port;
1275}
1276
1277static int ib_umad_init_port(struct ib_device *device, int port_num,
1278 struct ib_umad_device *umad_dev,
1279 struct ib_umad_port *port)
1280{
1281 int devnum;
1282 dev_t base_umad;
1283 dev_t base_issm;
1284 int ret;
1285
1286 devnum = ida_alloc_max(&umad_ida, IB_UMAD_MAX_PORTS - 1, GFP_KERNEL);
1287 if (devnum < 0)
1288 return -1;
1289 port->dev_num = devnum;
1290 if (devnum >= IB_UMAD_NUM_FIXED_MINOR) {
1291 base_umad = dynamic_umad_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;
1292 base_issm = dynamic_issm_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;
1293 } else {
1294 base_umad = devnum + base_umad_dev;
1295 base_issm = devnum + base_issm_dev;
1296 }
1297
1298 port->ib_dev = device;
1299 port->umad_dev = umad_dev;
1300 port->port_num = port_num;
1301 sema_init(&port->sm_sem, 1);
1302 mutex_init(&port->file_mutex);
1303 INIT_LIST_HEAD(&port->file_list);
1304
1305 ib_umad_init_port_dev(&port->dev, port, device);
1306 port->dev.devt = base_umad;
1307 dev_set_name(&port->dev, "umad%d", port->dev_num);
1308 cdev_init(&port->cdev, &umad_fops);
1309 port->cdev.owner = THIS_MODULE;
1310
1311 ret = cdev_device_add(&port->cdev, &port->dev);
1312 if (ret)
1313 goto err_cdev;
1314
1315 ib_umad_init_port_dev(&port->sm_dev, port, device);
1316 port->sm_dev.devt = base_issm;
1317 dev_set_name(&port->sm_dev, "issm%d", port->dev_num);
1318 cdev_init(&port->sm_cdev, &umad_sm_fops);
1319 port->sm_cdev.owner = THIS_MODULE;
1320
1321 ret = cdev_device_add(&port->sm_cdev, &port->sm_dev);
1322 if (ret)
1323 goto err_dev;
1324
1325 return 0;
1326
1327err_dev:
1328 put_device(&port->sm_dev);
1329 cdev_device_del(&port->cdev, &port->dev);
1330err_cdev:
1331 put_device(&port->dev);
1332 ida_free(&umad_ida, devnum);
1333 return ret;
1334}
1335
1336static void ib_umad_kill_port(struct ib_umad_port *port)
1337{
1338 struct ib_umad_file *file;
1339 int id;
1340
1341 cdev_device_del(&port->sm_cdev, &port->sm_dev);
1342 cdev_device_del(&port->cdev, &port->dev);
1343
1344 mutex_lock(&port->file_mutex);
1345
1346 /* Mark ib_dev NULL and block ioctl or other file ops to progress
1347 * further.
1348 */
1349 port->ib_dev = NULL;
1350
1351 list_for_each_entry(file, &port->file_list, port_list) {
1352 mutex_lock(&file->mutex);
1353 file->agents_dead = 1;
1354 wake_up_interruptible(&file->recv_wait);
1355 mutex_unlock(&file->mutex);
1356
1357 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1358 if (file->agent[id])
1359 ib_unregister_mad_agent(file->agent[id]);
1360 }
1361
1362 mutex_unlock(&port->file_mutex);
1363
1364 ida_free(&umad_ida, port->dev_num);
1365
1366 /* balances device_initialize() */
1367 put_device(&port->sm_dev);
1368 put_device(&port->dev);
1369}
1370
1371static int ib_umad_add_one(struct ib_device *device)
1372{
1373 struct ib_umad_device *umad_dev;
1374 int s, e, i;
1375 int count = 0;
1376 int ret;
1377
1378 s = rdma_start_port(device);
1379 e = rdma_end_port(device);
1380
1381 umad_dev = kzalloc(struct_size(umad_dev, ports,
1382 size_add(size_sub(e, s), 1)),
1383 GFP_KERNEL);
1384 if (!umad_dev)
1385 return -ENOMEM;
1386
1387 kref_init(&umad_dev->kref);
1388 for (i = s; i <= e; ++i) {
1389 if (!rdma_cap_ib_mad(device, i))
1390 continue;
1391
1392 ret = ib_umad_init_port(device, i, umad_dev,
1393 &umad_dev->ports[i - s]);
1394 if (ret)
1395 goto err;
1396
1397 count++;
1398 }
1399
1400 if (!count) {
1401 ret = -EOPNOTSUPP;
1402 goto free;
1403 }
1404
1405 ib_set_client_data(device, &umad_client, umad_dev);
1406
1407 return 0;
1408
1409err:
1410 while (--i >= s) {
1411 if (!rdma_cap_ib_mad(device, i))
1412 continue;
1413
1414 ib_umad_kill_port(&umad_dev->ports[i - s]);
1415 }
1416free:
1417 /* balances kref_init */
1418 ib_umad_dev_put(umad_dev);
1419 return ret;
1420}
1421
1422static void ib_umad_remove_one(struct ib_device *device, void *client_data)
1423{
1424 struct ib_umad_device *umad_dev = client_data;
1425 unsigned int i;
1426
1427 rdma_for_each_port (device, i) {
1428 if (rdma_cap_ib_mad(device, i))
1429 ib_umad_kill_port(
1430 &umad_dev->ports[i - rdma_start_port(device)]);
1431 }
1432 /* balances kref_init() */
1433 ib_umad_dev_put(umad_dev);
1434}
1435
1436static int __init ib_umad_init(void)
1437{
1438 int ret;
1439
1440 ret = register_chrdev_region(base_umad_dev,
1441 IB_UMAD_NUM_FIXED_MINOR * 2,
1442 umad_class.name);
1443 if (ret) {
1444 pr_err("couldn't register device number\n");
1445 goto out;
1446 }
1447
1448 ret = alloc_chrdev_region(&dynamic_umad_dev, 0,
1449 IB_UMAD_NUM_DYNAMIC_MINOR * 2,
1450 umad_class.name);
1451 if (ret) {
1452 pr_err("couldn't register dynamic device number\n");
1453 goto out_alloc;
1454 }
1455 dynamic_issm_dev = dynamic_umad_dev + IB_UMAD_NUM_DYNAMIC_MINOR;
1456
1457 ret = class_register(&umad_class);
1458 if (ret) {
1459 pr_err("couldn't create class infiniband_mad\n");
1460 goto out_chrdev;
1461 }
1462
1463 ret = ib_register_client(&umad_client);
1464 if (ret)
1465 goto out_class;
1466
1467 ret = ib_register_client(&issm_client);
1468 if (ret)
1469 goto out_client;
1470
1471 return 0;
1472
1473out_client:
1474 ib_unregister_client(&umad_client);
1475out_class:
1476 class_unregister(&umad_class);
1477
1478out_chrdev:
1479 unregister_chrdev_region(dynamic_umad_dev,
1480 IB_UMAD_NUM_DYNAMIC_MINOR * 2);
1481
1482out_alloc:
1483 unregister_chrdev_region(base_umad_dev,
1484 IB_UMAD_NUM_FIXED_MINOR * 2);
1485
1486out:
1487 return ret;
1488}
1489
1490static void __exit ib_umad_cleanup(void)
1491{
1492 ib_unregister_client(&issm_client);
1493 ib_unregister_client(&umad_client);
1494 class_unregister(&umad_class);
1495 unregister_chrdev_region(base_umad_dev,
1496 IB_UMAD_NUM_FIXED_MINOR * 2);
1497 unregister_chrdev_region(dynamic_umad_dev,
1498 IB_UMAD_NUM_DYNAMIC_MINOR * 2);
1499}
1500
1501module_init(ib_umad_init);
1502module_exit(ib_umad_cleanup);