1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
3 *
4 * Copyright (c) 2004 Topspin Communications. All rights reserved.
5 * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
6 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
7 * Copyright (c) 2008 Cisco. All rights reserved.
8 *
9 * This software is available to you under a choice of one of two
10 * licenses. You may choose to be licensed under the terms of the GNU
11 * General Public License (GPL) Version 2, available from the file
12 * COPYING in the main directory of this source tree, or the
13 * OpenIB.org BSD license below:
14 *
15 * Redistribution and use in source and binary forms, with or
16 * without modification, are permitted provided that the following
17 * conditions are met:
18 *
19 * - Redistributions of source code must retain the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer.
22 *
23 * - Redistributions in binary form must reproduce the above
24 * copyright notice, this list of conditions and the following
25 * disclaimer in the documentation and/or other materials
26 * provided with the distribution.
27 *
28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
29 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
30 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
31 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
32 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
33 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
34 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
35 * SOFTWARE.
36 */
37
38 #include <sys/cdefs.h>
39 #define pr_fmt(fmt) "user_mad: " fmt
40
41 #include <linux/module.h>
42 #include <linux/device.h>
43 #include <linux/err.h>
44 #include <linux/fs.h>
45 #include <linux/cdev.h>
46 #include <linux/dma-mapping.h>
47 #include <linux/poll.h>
48 #include <linux/mutex.h>
49 #include <linux/kref.h>
50 #include <linux/compat.h>
51 #include <linux/sched.h>
52 #include <linux/semaphore.h>
53 #include <linux/slab.h>
54
55 #include <asm/uaccess.h>
56
57 #include <rdma/ib_mad.h>
58 #include <rdma/ib_user_mad.h>
59
60 MODULE_AUTHOR("Roland Dreier");
61 MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");
62 MODULE_LICENSE("Dual BSD/GPL");
63
64 enum {
65 IB_UMAD_MAX_PORTS = 64,
66 IB_UMAD_MAX_AGENTS = 32,
67
68 IB_UMAD_MAJOR = 231,
69 IB_UMAD_MINOR_BASE = 0
70 };
71
72 /*
73 * Our lifetime rules for these structs are the following:
74 * device special file is opened, we take a reference on the
75 * ib_umad_port's struct ib_umad_device. We drop these
76 * references in the corresponding close().
77 *
78 * In addition to references coming from open character devices, there
79 * is one more reference to each ib_umad_device representing the
80 * module's reference taken when allocating the ib_umad_device in
81 * ib_umad_add_one().
82 *
83 * When destroying an ib_umad_device, we drop the module's reference.
84 */
85
86 struct ib_umad_port {
87 struct cdev cdev;
88 struct device *dev;
89
90 struct cdev sm_cdev;
91 struct device *sm_dev;
92 struct semaphore sm_sem;
93
94 struct mutex file_mutex;
95 struct list_head file_list;
96
97 struct ib_device *ib_dev;
98 struct ib_umad_device *umad_dev;
99 int dev_num;
100 u8 port_num;
101 };
102
103 struct ib_umad_device {
104 struct kobject kobj;
105 struct ib_umad_port port[0];
106 };
107
108 struct ib_umad_file {
109 struct mutex mutex;
110 struct ib_umad_port *port;
111 struct list_head recv_list;
112 struct list_head send_list;
113 struct list_head port_list;
114 spinlock_t send_lock;
115 wait_queue_head_t recv_wait;
116 struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS];
117 int agents_dead;
118 u8 use_pkey_index;
119 u8 already_used;
120 };
121
122 struct ib_umad_packet {
123 struct ib_mad_send_buf *msg;
124 struct ib_mad_recv_wc *recv_wc;
125 struct list_head list;
126 int length;
127 struct ib_user_mad mad;
128 };
129
130 static struct class *umad_class;
131
132 #define base_dev MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE)
133
134 static DEFINE_SPINLOCK(port_lock);
135 static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS);
136
137 static void ib_umad_add_one(struct ib_device *device);
138 static void ib_umad_remove_one(struct ib_device *device, void *client_data);
139
ib_umad_release_dev(struct kobject * kobj)140 static void ib_umad_release_dev(struct kobject *kobj)
141 {
142 struct ib_umad_device *dev =
143 container_of(kobj, struct ib_umad_device, kobj);
144
145 kfree(dev);
146 }
147
148 static struct kobj_type ib_umad_dev_ktype = {
149 .release = ib_umad_release_dev,
150 };
151
hdr_size(struct ib_umad_file * file)152 static int hdr_size(struct ib_umad_file *file)
153 {
154 return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) :
155 sizeof (struct ib_user_mad_hdr_old);
156 }
157
158 /* caller must hold file->mutex */
__get_agent(struct ib_umad_file * file,int id)159 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
160 {
161 return file->agents_dead ? NULL : file->agent[id];
162 }
163
queue_packet(struct ib_umad_file * file,struct ib_mad_agent * agent,struct ib_umad_packet * packet)164 static int queue_packet(struct ib_umad_file *file,
165 struct ib_mad_agent *agent,
166 struct ib_umad_packet *packet)
167 {
168 int ret = 1;
169
170 mutex_lock(&file->mutex);
171
172 for (packet->mad.hdr.id = 0;
173 packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
174 packet->mad.hdr.id++)
175 if (agent == __get_agent(file, packet->mad.hdr.id)) {
176 list_add_tail(&packet->list, &file->recv_list);
177 wake_up_interruptible(&file->recv_wait);
178 ret = 0;
179 break;
180 }
181
182 mutex_unlock(&file->mutex);
183
184 return ret;
185 }
186
dequeue_send(struct ib_umad_file * file,struct ib_umad_packet * packet)187 static void dequeue_send(struct ib_umad_file *file,
188 struct ib_umad_packet *packet)
189 {
190 spin_lock_irq(&file->send_lock);
191 list_del(&packet->list);
192 spin_unlock_irq(&file->send_lock);
193 }
194
send_handler(struct ib_mad_agent * agent,struct ib_mad_send_wc * send_wc)195 static void send_handler(struct ib_mad_agent *agent,
196 struct ib_mad_send_wc *send_wc)
197 {
198 struct ib_umad_file *file = agent->context;
199 struct ib_umad_packet *packet = send_wc->send_buf->context[0];
200
201 dequeue_send(file, packet);
202 ib_destroy_ah(packet->msg->ah, RDMA_DESTROY_AH_SLEEPABLE);
203 ib_free_send_mad(packet->msg);
204
205 if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
206 packet->length = IB_MGMT_MAD_HDR;
207 packet->mad.hdr.status = ETIMEDOUT;
208 if (!queue_packet(file, agent, packet))
209 return;
210 }
211 kfree(packet);
212 }
213
recv_handler(struct ib_mad_agent * agent,struct ib_mad_send_buf * send_buf,struct ib_mad_recv_wc * mad_recv_wc)214 static void recv_handler(struct ib_mad_agent *agent,
215 struct ib_mad_send_buf *send_buf,
216 struct ib_mad_recv_wc *mad_recv_wc)
217 {
218 struct ib_umad_file *file = agent->context;
219 struct ib_umad_packet *packet;
220
221 if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
222 goto err1;
223
224 packet = kzalloc(sizeof *packet, GFP_KERNEL);
225 if (!packet)
226 goto err1;
227
228 packet->length = mad_recv_wc->mad_len;
229 packet->recv_wc = mad_recv_wc;
230
231 packet->mad.hdr.status = 0;
232 packet->mad.hdr.length = hdr_size(file) + mad_recv_wc->mad_len;
233 packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp);
234 packet->mad.hdr.lid = cpu_to_be16(mad_recv_wc->wc->slid);
235 packet->mad.hdr.sl = mad_recv_wc->wc->sl;
236 packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits;
237 packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;
238 packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
239 if (packet->mad.hdr.grh_present) {
240 struct ib_ah_attr ah_attr;
241 int ret;
242
243 ret = ib_init_ah_from_wc(agent->device, agent->port_num,
244 mad_recv_wc->wc, mad_recv_wc->recv_buf.grh,
245 &ah_attr);
246 if (ret)
247 goto err2;
248
249 packet->mad.hdr.gid_index = ah_attr.grh.sgid_index;
250 packet->mad.hdr.hop_limit = ah_attr.grh.hop_limit;
251 packet->mad.hdr.traffic_class = ah_attr.grh.traffic_class;
252 memcpy(packet->mad.hdr.gid, &ah_attr.grh.dgid, 16);
253 packet->mad.hdr.flow_label = cpu_to_be32(ah_attr.grh.flow_label);
254 }
255
256 if (queue_packet(file, agent, packet))
257 goto err2;
258 return;
259
260 err2:
261 kfree(packet);
262 err1:
263 ib_free_recv_mad(mad_recv_wc);
264 }
265
copy_recv_mad(struct ib_umad_file * file,char __user * buf,struct ib_umad_packet * packet,size_t count)266 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
267 struct ib_umad_packet *packet, size_t count)
268 {
269 struct ib_mad_recv_buf *recv_buf;
270 int left, seg_payload, offset, max_seg_payload;
271 size_t seg_size;
272
273 recv_buf = &packet->recv_wc->recv_buf;
274 seg_size = packet->recv_wc->mad_seg_size;
275
276 /* We need enough room to copy the first (or only) MAD segment. */
277 if ((packet->length <= seg_size &&
278 count < hdr_size(file) + packet->length) ||
279 (packet->length > seg_size &&
280 count < hdr_size(file) + seg_size))
281 return -EINVAL;
282
283 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
284 return -EFAULT;
285
286 buf += hdr_size(file);
287 seg_payload = min_t(int, packet->length, seg_size);
288 if (copy_to_user(buf, recv_buf->mad, seg_payload))
289 return -EFAULT;
290
291 if (seg_payload < packet->length) {
292 /*
293 * Multipacket RMPP MAD message. Copy remainder of message.
294 * Note that last segment may have a shorter payload.
295 */
296 if (count < hdr_size(file) + packet->length) {
297 /*
298 * The buffer is too small, return the first RMPP segment,
299 * which includes the RMPP message length.
300 */
301 return -ENOSPC;
302 }
303 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
304 max_seg_payload = seg_size - offset;
305
306 for (left = packet->length - seg_payload, buf += seg_payload;
307 left; left -= seg_payload, buf += seg_payload) {
308 recv_buf = container_of(recv_buf->list.next,
309 struct ib_mad_recv_buf, list);
310 seg_payload = min(left, max_seg_payload);
311 if (copy_to_user(buf, (char *)recv_buf->mad + offset,
312 seg_payload))
313 return -EFAULT;
314 }
315 }
316 return hdr_size(file) + packet->length;
317 }
318
copy_send_mad(struct ib_umad_file * file,char __user * buf,struct ib_umad_packet * packet,size_t count)319 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
320 struct ib_umad_packet *packet, size_t count)
321 {
322 ssize_t size = hdr_size(file) + packet->length;
323
324 if (count < size)
325 return -EINVAL;
326
327 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
328 return -EFAULT;
329
330 buf += hdr_size(file);
331
332 if (copy_to_user(buf, packet->mad.data, packet->length))
333 return -EFAULT;
334
335 return size;
336 }
337
ib_umad_read(struct file * filp,char __user * buf,size_t count,loff_t * pos)338 static ssize_t ib_umad_read(struct file *filp, char __user *buf,
339 size_t count, loff_t *pos)
340 {
341 struct ib_umad_file *file = filp->private_data;
342 struct ib_umad_packet *packet;
343 ssize_t ret;
344
345 if (count < hdr_size(file))
346 return -EINVAL;
347
348 mutex_lock(&file->mutex);
349
350 while (list_empty(&file->recv_list)) {
351 mutex_unlock(&file->mutex);
352
353 if (filp->f_flags & O_NONBLOCK)
354 return -EAGAIN;
355
356 if (wait_event_interruptible(file->recv_wait,
357 !list_empty(&file->recv_list)))
358 return -ERESTARTSYS;
359
360 mutex_lock(&file->mutex);
361 }
362
363 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
364 list_del(&packet->list);
365
366 mutex_unlock(&file->mutex);
367
368 if (packet->recv_wc)
369 ret = copy_recv_mad(file, buf, packet, count);
370 else
371 ret = copy_send_mad(file, buf, packet, count);
372
373 if (ret < 0) {
374 /* Requeue packet */
375 mutex_lock(&file->mutex);
376 list_add(&packet->list, &file->recv_list);
377 mutex_unlock(&file->mutex);
378 } else {
379 if (packet->recv_wc)
380 ib_free_recv_mad(packet->recv_wc);
381 kfree(packet);
382 }
383 return ret;
384 }
385
copy_rmpp_mad(struct ib_mad_send_buf * msg,const char __user * buf)386 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
387 {
388 int left, seg;
389
390 /* Copy class specific header */
391 if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
392 copy_from_user((char *)msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
393 msg->hdr_len - IB_MGMT_RMPP_HDR))
394 return -EFAULT;
395
396 /* All headers are in place. Copy data segments. */
397 for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
398 seg++, left -= msg->seg_size, buf += msg->seg_size) {
399 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
400 min(left, msg->seg_size)))
401 return -EFAULT;
402 }
403 return 0;
404 }
405
same_destination(struct ib_user_mad_hdr * hdr1,struct ib_user_mad_hdr * hdr2)406 static int same_destination(struct ib_user_mad_hdr *hdr1,
407 struct ib_user_mad_hdr *hdr2)
408 {
409 if (!hdr1->grh_present && !hdr2->grh_present)
410 return (hdr1->lid == hdr2->lid);
411
412 if (hdr1->grh_present && hdr2->grh_present)
413 return !memcmp(hdr1->gid, hdr2->gid, 16);
414
415 return 0;
416 }
417
is_duplicate(struct ib_umad_file * file,struct ib_umad_packet * packet)418 static int is_duplicate(struct ib_umad_file *file,
419 struct ib_umad_packet *packet)
420 {
421 struct ib_umad_packet *sent_packet;
422 struct ib_mad_hdr *sent_hdr, *hdr;
423
424 hdr = (struct ib_mad_hdr *) packet->mad.data;
425 list_for_each_entry(sent_packet, &file->send_list, list) {
426 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
427
428 if ((hdr->tid != sent_hdr->tid) ||
429 (hdr->mgmt_class != sent_hdr->mgmt_class))
430 continue;
431
432 /*
433 * No need to be overly clever here. If two new operations have
434 * the same TID, reject the second as a duplicate. This is more
435 * restrictive than required by the spec.
436 */
437 if (!ib_response_mad(hdr)) {
438 if (!ib_response_mad(sent_hdr))
439 return 1;
440 continue;
441 } else if (!ib_response_mad(sent_hdr))
442 continue;
443
444 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
445 return 1;
446 }
447
448 return 0;
449 }
450
ib_umad_write(struct file * filp,const char __user * buf,size_t count,loff_t * pos)451 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
452 size_t count, loff_t *pos)
453 {
454 struct ib_umad_file *file = filp->private_data;
455 struct ib_umad_packet *packet;
456 struct ib_mad_agent *agent;
457 struct ib_ah_attr ah_attr;
458 struct ib_ah *ah;
459 struct ib_rmpp_mad *rmpp_mad;
460 __be64 *tid;
461 int ret, data_len, hdr_len, copy_offset, rmpp_active;
462 u8 base_version;
463
464 if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
465 return -EINVAL;
466
467 packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
468 if (!packet)
469 return -ENOMEM;
470
471 if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
472 ret = -EFAULT;
473 goto err;
474 }
475
476 if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
477 ret = -EINVAL;
478 goto err;
479 }
480
481 buf += hdr_size(file);
482
483 if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
484 ret = -EFAULT;
485 goto err;
486 }
487
488 mutex_lock(&file->mutex);
489
490 agent = __get_agent(file, packet->mad.hdr.id);
491 if (!agent) {
492 ret = -EINVAL;
493 goto err_up;
494 }
495
496 memset(&ah_attr, 0, sizeof ah_attr);
497 ah_attr.dlid = be16_to_cpu(packet->mad.hdr.lid);
498 ah_attr.sl = packet->mad.hdr.sl;
499 ah_attr.src_path_bits = packet->mad.hdr.path_bits;
500 ah_attr.port_num = file->port->port_num;
501 if (packet->mad.hdr.grh_present) {
502 ah_attr.ah_flags = IB_AH_GRH;
503 memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16);
504 ah_attr.grh.sgid_index = packet->mad.hdr.gid_index;
505 ah_attr.grh.flow_label = be32_to_cpu(packet->mad.hdr.flow_label);
506 ah_attr.grh.hop_limit = packet->mad.hdr.hop_limit;
507 ah_attr.grh.traffic_class = packet->mad.hdr.traffic_class;
508 }
509
510 ah = ib_create_user_ah(agent->qp->pd, &ah_attr, NULL);
511 if (IS_ERR(ah)) {
512 ret = PTR_ERR(ah);
513 goto err_up;
514 }
515
516 rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
517 hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
518
519 if (ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
520 && ib_mad_kernel_rmpp_agent(agent)) {
521 copy_offset = IB_MGMT_RMPP_HDR;
522 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
523 IB_MGMT_RMPP_FLAG_ACTIVE;
524 } else {
525 copy_offset = IB_MGMT_MAD_HDR;
526 rmpp_active = 0;
527 }
528
529 base_version = ((struct ib_mad_hdr *)&packet->mad.data)->base_version;
530 data_len = count - hdr_size(file) - hdr_len;
531 packet->msg = ib_create_send_mad(agent,
532 be32_to_cpu(packet->mad.hdr.qpn),
533 packet->mad.hdr.pkey_index, rmpp_active,
534 hdr_len, data_len, GFP_KERNEL,
535 base_version);
536 if (IS_ERR(packet->msg)) {
537 ret = PTR_ERR(packet->msg);
538 goto err_ah;
539 }
540
541 packet->msg->ah = ah;
542 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
543 packet->msg->retries = packet->mad.hdr.retries;
544 packet->msg->context[0] = packet;
545
546 /* Copy MAD header. Any RMPP header is already in place. */
547 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
548
549 if (!rmpp_active) {
550 if (copy_from_user((char *)packet->msg->mad + copy_offset,
551 buf + copy_offset,
552 hdr_len + data_len - copy_offset)) {
553 ret = -EFAULT;
554 goto err_msg;
555 }
556 } else {
557 ret = copy_rmpp_mad(packet->msg, buf);
558 if (ret)
559 goto err_msg;
560 }
561
562 /*
563 * Set the high-order part of the transaction ID to make MADs from
564 * different agents unique, and allow routing responses back to the
565 * original requestor.
566 */
567 if (!ib_response_mad(packet->msg->mad)) {
568 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
569 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
570 (be64_to_cpup(tid) & 0xffffffff));
571 rmpp_mad->mad_hdr.tid = *tid;
572 }
573
574 if (!ib_mad_kernel_rmpp_agent(agent)
575 && ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
576 && (ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE)) {
577 spin_lock_irq(&file->send_lock);
578 list_add_tail(&packet->list, &file->send_list);
579 spin_unlock_irq(&file->send_lock);
580 } else {
581 spin_lock_irq(&file->send_lock);
582 ret = is_duplicate(file, packet);
583 if (!ret)
584 list_add_tail(&packet->list, &file->send_list);
585 spin_unlock_irq(&file->send_lock);
586 if (ret) {
587 ret = -EINVAL;
588 goto err_msg;
589 }
590 }
591
592 ret = ib_post_send_mad(packet->msg, NULL);
593 if (ret)
594 goto err_send;
595
596 mutex_unlock(&file->mutex);
597 return count;
598
599 err_send:
600 dequeue_send(file, packet);
601 err_msg:
602 ib_free_send_mad(packet->msg);
603 err_ah:
604 ib_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);
605 err_up:
606 mutex_unlock(&file->mutex);
607 err:
608 kfree(packet);
609 return ret;
610 }
611
ib_umad_poll(struct file * filp,struct poll_table_struct * wait)612 static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
613 {
614 struct ib_umad_file *file = filp->private_data;
615
616 /* we will always be able to post a MAD send */
617 unsigned int mask = POLLOUT | POLLWRNORM;
618
619 poll_wait(filp, &file->recv_wait, wait);
620
621 if (!list_empty(&file->recv_list))
622 mask |= POLLIN | POLLRDNORM;
623
624 return mask;
625 }
626
ib_umad_reg_agent(struct ib_umad_file * file,void __user * arg,int compat_method_mask)627 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
628 int compat_method_mask)
629 {
630 struct ib_user_mad_reg_req ureq;
631 struct ib_mad_reg_req req;
632 struct ib_mad_agent *agent = NULL;
633 int agent_id;
634 int ret;
635
636 mutex_lock(&file->port->file_mutex);
637 mutex_lock(&file->mutex);
638
639 if (!file->port->ib_dev) {
640 dev_notice(file->port->dev,
641 "ib_umad_reg_agent: invalid device\n");
642 ret = -EPIPE;
643 goto out;
644 }
645
646 if (copy_from_user(&ureq, arg, sizeof ureq)) {
647 ret = -EFAULT;
648 goto out;
649 }
650
651 if (ureq.qpn != 0 && ureq.qpn != 1) {
652 dev_notice(file->port->dev,
653 "ib_umad_reg_agent: invalid QPN %d specified\n",
654 ureq.qpn);
655 ret = -EINVAL;
656 goto out;
657 }
658
659 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
660 if (!__get_agent(file, agent_id))
661 goto found;
662
663 dev_notice(file->port->dev,
664 "ib_umad_reg_agent: Max Agents (%u) reached\n",
665 IB_UMAD_MAX_AGENTS);
666 ret = -ENOMEM;
667 goto out;
668
669 found:
670 if (ureq.mgmt_class) {
671 memset(&req, 0, sizeof(req));
672 req.mgmt_class = ureq.mgmt_class;
673 req.mgmt_class_version = ureq.mgmt_class_version;
674 memcpy(req.oui, ureq.oui, sizeof req.oui);
675
676 if (compat_method_mask) {
677 u32 *umm = (u32 *) ureq.method_mask;
678 int i;
679
680 for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
681 req.method_mask[i] =
682 umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
683 } else
684 memcpy(req.method_mask, ureq.method_mask,
685 sizeof req.method_mask);
686 }
687
688 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
689 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
690 ureq.mgmt_class ? &req : NULL,
691 ureq.rmpp_version,
692 send_handler, recv_handler, file, 0);
693 if (IS_ERR(agent)) {
694 ret = PTR_ERR(agent);
695 agent = NULL;
696 goto out;
697 }
698
699 if (put_user(agent_id,
700 (u32 __user *) ((char *)arg + offsetof(struct ib_user_mad_reg_req, id)))) {
701 ret = -EFAULT;
702 goto out;
703 }
704
705 if (!file->already_used) {
706 file->already_used = 1;
707 if (!file->use_pkey_index) {
708 dev_warn(file->port->dev,
709 "process %s did not enable P_Key index support.\n",
710 current->comm);
711 dev_warn(file->port->dev,
712 " Documentation/infiniband/user_mad.txt has info on the new ABI.\n");
713 }
714 }
715
716 file->agent[agent_id] = agent;
717 ret = 0;
718
719 out:
720 mutex_unlock(&file->mutex);
721
722 if (ret && agent)
723 ib_unregister_mad_agent(agent);
724
725 mutex_unlock(&file->port->file_mutex);
726
727 return ret;
728 }
729
ib_umad_reg_agent2(struct ib_umad_file * file,void __user * arg)730 static int ib_umad_reg_agent2(struct ib_umad_file *file, void __user *arg)
731 {
732 struct ib_user_mad_reg_req2 ureq;
733 struct ib_mad_reg_req req;
734 struct ib_mad_agent *agent = NULL;
735 int agent_id;
736 int ret;
737
738 mutex_lock(&file->port->file_mutex);
739 mutex_lock(&file->mutex);
740
741 if (!file->port->ib_dev) {
742 dev_notice(file->port->dev,
743 "ib_umad_reg_agent2: invalid device\n");
744 ret = -EPIPE;
745 goto out;
746 }
747
748 if (copy_from_user(&ureq, arg, sizeof(ureq))) {
749 ret = -EFAULT;
750 goto out;
751 }
752
753 if (ureq.qpn != 0 && ureq.qpn != 1) {
754 dev_notice(file->port->dev,
755 "ib_umad_reg_agent2: invalid QPN %d specified\n",
756 ureq.qpn);
757 ret = -EINVAL;
758 goto out;
759 }
760
761 if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) {
762 const u32 flags = IB_USER_MAD_REG_FLAGS_CAP;
763 dev_notice(file->port->dev,
764 "ib_umad_reg_agent2 failed: invalid registration flags specified 0x%x; supported 0x%x\n",
765 ureq.flags, IB_USER_MAD_REG_FLAGS_CAP);
766 ret = -EINVAL;
767
768 if (put_user(flags,
769 (u32 __user *) ((char *)arg + offsetof(struct
770 ib_user_mad_reg_req2, flags))))
771 ret = -EFAULT;
772
773 goto out;
774 }
775
776 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
777 if (!__get_agent(file, agent_id))
778 goto found;
779
780 dev_notice(file->port->dev,
781 "ib_umad_reg_agent2: Max Agents (%u) reached\n",
782 IB_UMAD_MAX_AGENTS);
783 ret = -ENOMEM;
784 goto out;
785
786 found:
787 if (ureq.mgmt_class) {
788 memset(&req, 0, sizeof(req));
789 req.mgmt_class = ureq.mgmt_class;
790 req.mgmt_class_version = ureq.mgmt_class_version;
791 if (ureq.oui & 0xff000000) {
792 dev_notice(file->port->dev,
793 "ib_umad_reg_agent2 failed: oui invalid 0x%08x\n",
794 ureq.oui);
795 ret = -EINVAL;
796 goto out;
797 }
798 req.oui[2] = ureq.oui & 0x0000ff;
799 req.oui[1] = (ureq.oui & 0x00ff00) >> 8;
800 req.oui[0] = (ureq.oui & 0xff0000) >> 16;
801 memcpy(req.method_mask, ureq.method_mask,
802 sizeof(req.method_mask));
803 }
804
805 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
806 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
807 ureq.mgmt_class ? &req : NULL,
808 ureq.rmpp_version,
809 send_handler, recv_handler, file,
810 ureq.flags);
811 if (IS_ERR(agent)) {
812 ret = PTR_ERR(agent);
813 agent = NULL;
814 goto out;
815 }
816
817 if (put_user(agent_id,
818 (u32 __user *)((char *)arg +
819 offsetof(struct ib_user_mad_reg_req2, id)))) {
820 ret = -EFAULT;
821 goto out;
822 }
823
824 if (!file->already_used) {
825 file->already_used = 1;
826 file->use_pkey_index = 1;
827 }
828
829 file->agent[agent_id] = agent;
830 ret = 0;
831
832 out:
833 mutex_unlock(&file->mutex);
834
835 if (ret && agent)
836 ib_unregister_mad_agent(agent);
837
838 mutex_unlock(&file->port->file_mutex);
839
840 return ret;
841 }
842
843
ib_umad_unreg_agent(struct ib_umad_file * file,u32 __user * arg)844 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
845 {
846 struct ib_mad_agent *agent = NULL;
847 u32 id;
848 int ret = 0;
849
850 if (get_user(id, arg))
851 return -EFAULT;
852
853 mutex_lock(&file->port->file_mutex);
854 mutex_lock(&file->mutex);
855
856 if (id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
857 ret = -EINVAL;
858 goto out;
859 }
860
861 agent = file->agent[id];
862 file->agent[id] = NULL;
863
864 out:
865 mutex_unlock(&file->mutex);
866
867 if (agent)
868 ib_unregister_mad_agent(agent);
869
870 mutex_unlock(&file->port->file_mutex);
871
872 return ret;
873 }
874
ib_umad_enable_pkey(struct ib_umad_file * file)875 static long ib_umad_enable_pkey(struct ib_umad_file *file)
876 {
877 int ret = 0;
878
879 mutex_lock(&file->mutex);
880 if (file->already_used)
881 ret = -EINVAL;
882 else
883 file->use_pkey_index = 1;
884 mutex_unlock(&file->mutex);
885
886 return ret;
887 }
888
ib_umad_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)889 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
890 unsigned long arg)
891 {
892 switch (cmd) {
893 case IB_USER_MAD_REGISTER_AGENT:
894 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
895 case IB_USER_MAD_UNREGISTER_AGENT:
896 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
897 case IB_USER_MAD_ENABLE_PKEY:
898 return ib_umad_enable_pkey(filp->private_data);
899 case IB_USER_MAD_REGISTER_AGENT2:
900 return ib_umad_reg_agent2(filp->private_data, (void __user *) arg);
901 default:
902 return -ENOIOCTLCMD;
903 }
904 }
905
906 #ifdef CONFIG_COMPAT
ib_umad_compat_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)907 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
908 unsigned long arg)
909 {
910 switch (cmd) {
911 case IB_USER_MAD_REGISTER_AGENT:
912 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
913 case IB_USER_MAD_UNREGISTER_AGENT:
914 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
915 case IB_USER_MAD_ENABLE_PKEY:
916 return ib_umad_enable_pkey(filp->private_data);
917 case IB_USER_MAD_REGISTER_AGENT2:
918 return ib_umad_reg_agent2(filp->private_data, compat_ptr(arg));
919 default:
920 return -ENOIOCTLCMD;
921 }
922 }
923 #endif
924
925 /*
926 * ib_umad_open() does not need the BKL:
927 *
928 * - the ib_umad_port structures are properly reference counted, and
929 * everything else is purely local to the file being created, so
930 * races against other open calls are not a problem;
931 * - the ioctl method does not affect any global state outside of the
932 * file structure being operated on;
933 */
ib_umad_open(struct inode * inode,struct file * filp)934 static int ib_umad_open(struct inode *inode, struct file *filp)
935 {
936 struct ib_umad_port *port;
937 struct ib_umad_file *file;
938 int ret = -ENXIO;
939
940 port = container_of(inode->i_cdev->si_drv1, struct ib_umad_port, cdev);
941
942 mutex_lock(&port->file_mutex);
943
944 if (!port->ib_dev)
945 goto out;
946
947 ret = -ENOMEM;
948 file = kzalloc(sizeof *file, GFP_KERNEL);
949 if (!file)
950 goto out;
951
952 mutex_init(&file->mutex);
953 spin_lock_init(&file->send_lock);
954 INIT_LIST_HEAD(&file->recv_list);
955 INIT_LIST_HEAD(&file->send_list);
956 init_waitqueue_head(&file->recv_wait);
957
958 file->port = port;
959 filp->private_data = file;
960
961 list_add_tail(&file->port_list, &port->file_list);
962
963 ret = nonseekable_open(inode, filp);
964 if (ret) {
965 list_del(&file->port_list);
966 kfree(file);
967 goto out;
968 }
969
970 kobject_get(&port->umad_dev->kobj);
971
972 out:
973 mutex_unlock(&port->file_mutex);
974 return ret;
975 }
976
ib_umad_close(struct inode * inode,struct file * filp)977 static int ib_umad_close(struct inode *inode, struct file *filp)
978 {
979 struct ib_umad_file *file = filp->private_data;
980 struct ib_umad_device *dev = file->port->umad_dev;
981 struct ib_umad_packet *packet, *tmp;
982 int already_dead;
983 int i;
984
985 mutex_lock(&file->port->file_mutex);
986 mutex_lock(&file->mutex);
987
988 already_dead = file->agents_dead;
989 file->agents_dead = 1;
990
991 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
992 if (packet->recv_wc)
993 ib_free_recv_mad(packet->recv_wc);
994 kfree(packet);
995 }
996
997 list_del(&file->port_list);
998
999 mutex_unlock(&file->mutex);
1000
1001 if (!already_dead)
1002 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
1003 if (file->agent[i])
1004 ib_unregister_mad_agent(file->agent[i]);
1005
1006 mutex_unlock(&file->port->file_mutex);
1007
1008 kfree(file);
1009 kobject_put(&dev->kobj);
1010
1011 return 0;
1012 }
1013
1014 static const struct file_operations umad_fops = {
1015 .owner = THIS_MODULE,
1016 .read = ib_umad_read,
1017 .write = ib_umad_write,
1018 .poll = ib_umad_poll,
1019 .unlocked_ioctl = ib_umad_ioctl,
1020 #ifdef CONFIG_COMPAT
1021 .compat_ioctl = ib_umad_compat_ioctl,
1022 #endif
1023 .open = ib_umad_open,
1024 .release = ib_umad_close,
1025 .llseek = no_llseek,
1026 };
1027
ib_umad_sm_open(struct inode * inode,struct file * filp)1028 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
1029 {
1030 struct ib_umad_port *port;
1031 struct ib_port_modify props = {
1032 .set_port_cap_mask = IB_PORT_SM
1033 };
1034 int ret;
1035
1036 port = container_of(inode->i_cdev->si_drv1, struct ib_umad_port, sm_cdev);
1037
1038 if (filp->f_flags & O_NONBLOCK) {
1039 if (down_trylock(&port->sm_sem)) {
1040 ret = -EAGAIN;
1041 goto fail;
1042 }
1043 } else {
1044 if (down_interruptible(&port->sm_sem)) {
1045 ret = -ERESTARTSYS;
1046 goto fail;
1047 }
1048 }
1049
1050 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1051 if (ret)
1052 goto err_up_sem;
1053
1054 filp->private_data = port;
1055
1056 ret = nonseekable_open(inode, filp);
1057 if (ret)
1058 goto err_clr_sm_cap;
1059
1060 kobject_get(&port->umad_dev->kobj);
1061
1062 return 0;
1063
1064 err_clr_sm_cap:
1065 swap(props.set_port_cap_mask, props.clr_port_cap_mask);
1066 ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1067
1068 err_up_sem:
1069 up(&port->sm_sem);
1070
1071 fail:
1072 return ret;
1073 }
1074
ib_umad_sm_close(struct inode * inode,struct file * filp)1075 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
1076 {
1077 struct ib_umad_port *port = filp->private_data;
1078 struct ib_port_modify props = {
1079 .clr_port_cap_mask = IB_PORT_SM
1080 };
1081 int ret = 0;
1082
1083 mutex_lock(&port->file_mutex);
1084 if (port->ib_dev)
1085 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1086 mutex_unlock(&port->file_mutex);
1087
1088 up(&port->sm_sem);
1089
1090 kobject_put(&port->umad_dev->kobj);
1091
1092 return ret;
1093 }
1094
1095 static const struct file_operations umad_sm_fops = {
1096 .owner = THIS_MODULE,
1097 .open = ib_umad_sm_open,
1098 .release = ib_umad_sm_close,
1099 .llseek = no_llseek,
1100 };
1101
1102 static struct ib_client umad_client = {
1103 .name = "umad",
1104 .add = ib_umad_add_one,
1105 .remove = ib_umad_remove_one
1106 };
1107
show_ibdev(struct device * dev,struct device_attribute * attr,char * buf)1108 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
1109 char *buf)
1110 {
1111 struct ib_umad_port *port = dev_get_drvdata(dev);
1112
1113 if (!port)
1114 return -ENODEV;
1115
1116 return sprintf(buf, "%s\n", port->ib_dev->name);
1117 }
1118 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1119
show_port(struct device * dev,struct device_attribute * attr,char * buf)1120 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
1121 char *buf)
1122 {
1123 struct ib_umad_port *port = dev_get_drvdata(dev);
1124
1125 if (!port)
1126 return -ENODEV;
1127
1128 return sprintf(buf, "%d\n", port->port_num);
1129 }
1130 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1131
1132 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1133 __stringify(IB_USER_MAD_ABI_VERSION));
1134
1135 static dev_t overflow_maj;
1136 static DECLARE_BITMAP(overflow_map, IB_UMAD_MAX_PORTS);
find_overflow_devnum(struct ib_device * device)1137 static int find_overflow_devnum(struct ib_device *device)
1138 {
1139 int ret;
1140
1141 if (!overflow_maj) {
1142 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UMAD_MAX_PORTS * 2,
1143 "infiniband_mad");
1144 if (ret) {
1145 dev_err(&device->dev,
1146 "couldn't register dynamic device number\n");
1147 return ret;
1148 }
1149 }
1150
1151 ret = find_first_zero_bit(overflow_map, IB_UMAD_MAX_PORTS);
1152 if (ret >= IB_UMAD_MAX_PORTS)
1153 return -1;
1154
1155 return ret;
1156 }
1157
ib_umad_init_port(struct ib_device * device,int port_num,struct ib_umad_device * umad_dev,struct ib_umad_port * port)1158 static int ib_umad_init_port(struct ib_device *device, int port_num,
1159 struct ib_umad_device *umad_dev,
1160 struct ib_umad_port *port)
1161 {
1162 int devnum;
1163 dev_t base;
1164
1165 spin_lock(&port_lock);
1166 devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
1167 if (devnum >= IB_UMAD_MAX_PORTS) {
1168 spin_unlock(&port_lock);
1169 devnum = find_overflow_devnum(device);
1170 if (devnum < 0)
1171 return -1;
1172
1173 spin_lock(&port_lock);
1174 port->dev_num = devnum + IB_UMAD_MAX_PORTS;
1175 base = devnum + overflow_maj;
1176 set_bit(devnum, overflow_map);
1177 } else {
1178 port->dev_num = devnum;
1179 base = devnum + base_dev;
1180 set_bit(devnum, dev_map);
1181 }
1182 spin_unlock(&port_lock);
1183
1184 port->ib_dev = device;
1185 port->port_num = port_num;
1186 sema_init(&port->sm_sem, 1);
1187 mutex_init(&port->file_mutex);
1188 INIT_LIST_HEAD(&port->file_list);
1189
1190 cdev_init(&port->cdev, &umad_fops);
1191 port->cdev.owner = THIS_MODULE;
1192 port->cdev.kobj.parent = &umad_dev->kobj;
1193 kobject_set_name(&port->cdev.kobj, "umad%d", port->dev_num);
1194 if (cdev_add(&port->cdev, base, 1))
1195 goto err_cdev;
1196
1197 port->dev = device_create(umad_class, device->dma_device,
1198 port->cdev.dev, port,
1199 "umad%d", port->dev_num);
1200 if (IS_ERR(port->dev))
1201 goto err_cdev;
1202
1203 if (device_create_file(port->dev, &dev_attr_ibdev))
1204 goto err_dev;
1205 if (device_create_file(port->dev, &dev_attr_port))
1206 goto err_dev;
1207
1208 base += IB_UMAD_MAX_PORTS;
1209 cdev_init(&port->sm_cdev, &umad_sm_fops);
1210 port->sm_cdev.owner = THIS_MODULE;
1211 port->sm_cdev.kobj.parent = &umad_dev->kobj;
1212 kobject_set_name(&port->sm_cdev.kobj, "issm%d", port->dev_num);
1213 if (cdev_add(&port->sm_cdev, base, 1))
1214 goto err_sm_cdev;
1215
1216 port->sm_dev = device_create(umad_class, device->dma_device,
1217 port->sm_cdev.dev, port,
1218 "issm%d", port->dev_num);
1219 if (IS_ERR(port->sm_dev))
1220 goto err_sm_cdev;
1221
1222 if (device_create_file(port->sm_dev, &dev_attr_ibdev))
1223 goto err_sm_dev;
1224 if (device_create_file(port->sm_dev, &dev_attr_port))
1225 goto err_sm_dev;
1226
1227 return 0;
1228
1229 err_sm_dev:
1230 device_destroy(umad_class, port->sm_cdev.dev);
1231
1232 err_sm_cdev:
1233 cdev_del(&port->sm_cdev);
1234
1235 err_dev:
1236 device_destroy(umad_class, port->cdev.dev);
1237
1238 err_cdev:
1239 cdev_del(&port->cdev);
1240 if (port->dev_num < IB_UMAD_MAX_PORTS)
1241 clear_bit(devnum, dev_map);
1242 else
1243 clear_bit(devnum, overflow_map);
1244
1245 return -1;
1246 }
1247
ib_umad_kill_port(struct ib_umad_port * port)1248 static void ib_umad_kill_port(struct ib_umad_port *port)
1249 {
1250 struct ib_umad_file *file;
1251 int id;
1252
1253 dev_set_drvdata(port->dev, NULL);
1254 dev_set_drvdata(port->sm_dev, NULL);
1255
1256 device_destroy(umad_class, port->cdev.dev);
1257 device_destroy(umad_class, port->sm_cdev.dev);
1258
1259 cdev_del(&port->cdev);
1260 cdev_del(&port->sm_cdev);
1261
1262 mutex_lock(&port->file_mutex);
1263
1264 port->ib_dev = NULL;
1265
1266 list_for_each_entry(file, &port->file_list, port_list) {
1267 mutex_lock(&file->mutex);
1268 file->agents_dead = 1;
1269 mutex_unlock(&file->mutex);
1270
1271 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1272 if (file->agent[id])
1273 ib_unregister_mad_agent(file->agent[id]);
1274 }
1275
1276 mutex_unlock(&port->file_mutex);
1277
1278 if (port->dev_num < IB_UMAD_MAX_PORTS)
1279 clear_bit(port->dev_num, dev_map);
1280 else
1281 clear_bit(port->dev_num - IB_UMAD_MAX_PORTS, overflow_map);
1282 }
1283
ib_umad_add_one(struct ib_device * device)1284 static void ib_umad_add_one(struct ib_device *device)
1285 {
1286 struct ib_umad_device *umad_dev;
1287 int s, e, i;
1288 int count = 0;
1289
1290 s = rdma_start_port(device);
1291 e = rdma_end_port(device);
1292
1293 umad_dev = kzalloc(sizeof *umad_dev +
1294 (e - s + 1) * sizeof (struct ib_umad_port),
1295 GFP_KERNEL);
1296 if (!umad_dev)
1297 return;
1298
1299 kobject_init(&umad_dev->kobj, &ib_umad_dev_ktype);
1300
1301 for (i = s; i <= e; ++i) {
1302 if (!rdma_cap_ib_mad(device, i))
1303 continue;
1304
1305 umad_dev->port[i - s].umad_dev = umad_dev;
1306
1307 if (ib_umad_init_port(device, i, umad_dev,
1308 &umad_dev->port[i - s]))
1309 goto err;
1310
1311 count++;
1312 }
1313
1314 if (!count)
1315 goto free;
1316
1317 ib_set_client_data(device, &umad_client, umad_dev);
1318
1319 return;
1320
1321 err:
1322 while (--i >= s) {
1323 if (!rdma_cap_ib_mad(device, i))
1324 continue;
1325
1326 ib_umad_kill_port(&umad_dev->port[i - s]);
1327 }
1328 free:
1329 kobject_put(&umad_dev->kobj);
1330 }
1331
ib_umad_remove_one(struct ib_device * device,void * client_data)1332 static void ib_umad_remove_one(struct ib_device *device, void *client_data)
1333 {
1334 struct ib_umad_device *umad_dev = client_data;
1335 int i;
1336
1337 if (!umad_dev)
1338 return;
1339
1340 for (i = 0; i <= rdma_end_port(device) - rdma_start_port(device); ++i) {
1341 if (rdma_cap_ib_mad(device, i + rdma_start_port(device)))
1342 ib_umad_kill_port(&umad_dev->port[i]);
1343 }
1344
1345 kobject_put(&umad_dev->kobj);
1346 }
1347
umad_devnode(struct device * dev,umode_t * mode)1348 static char *umad_devnode(struct device *dev, umode_t *mode)
1349 {
1350 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1351 }
1352
ib_umad_init(void)1353 static int __init ib_umad_init(void)
1354 {
1355 int ret;
1356
1357 ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
1358 "infiniband_mad");
1359 if (ret) {
1360 pr_err("couldn't register device number\n");
1361 goto out;
1362 }
1363
1364 umad_class = class_create(THIS_MODULE, "infiniband_mad");
1365 if (IS_ERR(umad_class)) {
1366 ret = PTR_ERR(umad_class);
1367 pr_err("couldn't create class infiniband_mad\n");
1368 goto out_chrdev;
1369 }
1370
1371 umad_class->devnode = umad_devnode;
1372
1373 ret = class_create_file(umad_class, &class_attr_abi_version.attr);
1374 if (ret) {
1375 pr_err("couldn't create abi_version attribute\n");
1376 goto out_class;
1377 }
1378
1379 ret = ib_register_client(&umad_client);
1380 if (ret) {
1381 pr_err("couldn't register ib_umad client\n");
1382 goto out_class;
1383 }
1384
1385 return 0;
1386
1387 out_class:
1388 class_destroy(umad_class);
1389
1390 out_chrdev:
1391 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1392
1393 out:
1394 return ret;
1395 }
1396
ib_umad_cleanup(void)1397 static void __exit ib_umad_cleanup(void)
1398 {
1399 ib_unregister_client(&umad_client);
1400 class_destroy(umad_class);
1401 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1402 if (overflow_maj)
1403 unregister_chrdev_region(overflow_maj, IB_UMAD_MAX_PORTS * 2);
1404 }
1405
1406 module_init_order(ib_umad_init, SI_ORDER_FIFTH);
1407 module_exit_order(ib_umad_cleanup, SI_ORDER_FIFTH);
1408