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