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 rdma_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 = ib_lid_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 rdma_ah_attr ah_attr;
241 const struct ib_global_route *grh;
242 int ret;
243
244 ret = ib_init_ah_attr_from_wc(agent->device, agent->port_num,
245 mad_recv_wc->wc,
246 mad_recv_wc->recv_buf.grh,
247 &ah_attr);
248 if (ret)
249 goto err2;
250
251 grh = rdma_ah_read_grh(&ah_attr);
252 packet->mad.hdr.gid_index = grh->sgid_index;
253 packet->mad.hdr.hop_limit = grh->hop_limit;
254 packet->mad.hdr.traffic_class = grh->traffic_class;
255 memcpy(packet->mad.hdr.gid, &grh->dgid, 16);
256 packet->mad.hdr.flow_label = cpu_to_be32(grh->flow_label);
257 rdma_destroy_ah_attr(&ah_attr);
258 }
259
260 if (queue_packet(file, agent, packet))
261 goto err2;
262 return;
263
264 err2:
265 kfree(packet);
266 err1:
267 ib_free_recv_mad(mad_recv_wc);
268 }
269
copy_recv_mad(struct ib_umad_file * file,char __user * buf,struct ib_umad_packet * packet,size_t count)270 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
271 struct ib_umad_packet *packet, size_t count)
272 {
273 struct ib_mad_recv_buf *recv_buf;
274 int left, seg_payload, offset, max_seg_payload;
275 size_t seg_size;
276
277 recv_buf = &packet->recv_wc->recv_buf;
278 seg_size = packet->recv_wc->mad_seg_size;
279
280 /* We need enough room to copy the first (or only) MAD segment. */
281 if ((packet->length <= seg_size &&
282 count < hdr_size(file) + packet->length) ||
283 (packet->length > seg_size &&
284 count < hdr_size(file) + seg_size))
285 return -EINVAL;
286
287 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
288 return -EFAULT;
289
290 buf += hdr_size(file);
291 seg_payload = min_t(int, packet->length, seg_size);
292 if (copy_to_user(buf, recv_buf->mad, seg_payload))
293 return -EFAULT;
294
295 if (seg_payload < packet->length) {
296 /*
297 * Multipacket RMPP MAD message. Copy remainder of message.
298 * Note that last segment may have a shorter payload.
299 */
300 if (count < hdr_size(file) + packet->length) {
301 /*
302 * The buffer is too small, return the first RMPP segment,
303 * which includes the RMPP message length.
304 */
305 return -ENOSPC;
306 }
307 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
308 max_seg_payload = seg_size - offset;
309
310 for (left = packet->length - seg_payload, buf += seg_payload;
311 left; left -= seg_payload, buf += seg_payload) {
312 recv_buf = container_of(recv_buf->list.next,
313 struct ib_mad_recv_buf, list);
314 seg_payload = min(left, max_seg_payload);
315 if (copy_to_user(buf, (char *)recv_buf->mad + offset,
316 seg_payload))
317 return -EFAULT;
318 }
319 }
320 return hdr_size(file) + packet->length;
321 }
322
copy_send_mad(struct ib_umad_file * file,char __user * buf,struct ib_umad_packet * packet,size_t count)323 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
324 struct ib_umad_packet *packet, size_t count)
325 {
326 ssize_t size = hdr_size(file) + packet->length;
327
328 if (count < size)
329 return -EINVAL;
330
331 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
332 return -EFAULT;
333
334 buf += hdr_size(file);
335
336 if (copy_to_user(buf, packet->mad.data, packet->length))
337 return -EFAULT;
338
339 return size;
340 }
341
ib_umad_read(struct file * filp,char __user * buf,size_t count,loff_t * pos)342 static ssize_t ib_umad_read(struct file *filp, char __user *buf,
343 size_t count, loff_t *pos)
344 {
345 struct ib_umad_file *file = filp->private_data;
346 struct ib_umad_packet *packet;
347 ssize_t ret;
348
349 if (count < hdr_size(file))
350 return -EINVAL;
351
352 mutex_lock(&file->mutex);
353
354 while (list_empty(&file->recv_list)) {
355 mutex_unlock(&file->mutex);
356
357 if (filp->f_flags & O_NONBLOCK)
358 return -EAGAIN;
359
360 if (wait_event_interruptible(file->recv_wait,
361 !list_empty(&file->recv_list)))
362 return -ERESTARTSYS;
363
364 mutex_lock(&file->mutex);
365 }
366
367 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
368 list_del(&packet->list);
369
370 mutex_unlock(&file->mutex);
371
372 if (packet->recv_wc)
373 ret = copy_recv_mad(file, buf, packet, count);
374 else
375 ret = copy_send_mad(file, buf, packet, count);
376
377 if (ret < 0) {
378 /* Requeue packet */
379 mutex_lock(&file->mutex);
380 list_add(&packet->list, &file->recv_list);
381 mutex_unlock(&file->mutex);
382 } else {
383 if (packet->recv_wc)
384 ib_free_recv_mad(packet->recv_wc);
385 kfree(packet);
386 }
387 return ret;
388 }
389
copy_rmpp_mad(struct ib_mad_send_buf * msg,const char __user * buf)390 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
391 {
392 int left, seg;
393
394 /* Copy class specific header */
395 if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
396 copy_from_user((char *)msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
397 msg->hdr_len - IB_MGMT_RMPP_HDR))
398 return -EFAULT;
399
400 /* All headers are in place. Copy data segments. */
401 for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
402 seg++, left -= msg->seg_size, buf += msg->seg_size) {
403 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
404 min(left, msg->seg_size)))
405 return -EFAULT;
406 }
407 return 0;
408 }
409
same_destination(struct ib_user_mad_hdr * hdr1,struct ib_user_mad_hdr * hdr2)410 static int same_destination(struct ib_user_mad_hdr *hdr1,
411 struct ib_user_mad_hdr *hdr2)
412 {
413 if (!hdr1->grh_present && !hdr2->grh_present)
414 return (hdr1->lid == hdr2->lid);
415
416 if (hdr1->grh_present && hdr2->grh_present)
417 return !memcmp(hdr1->gid, hdr2->gid, 16);
418
419 return 0;
420 }
421
is_duplicate(struct ib_umad_file * file,struct ib_umad_packet * packet)422 static int is_duplicate(struct ib_umad_file *file,
423 struct ib_umad_packet *packet)
424 {
425 struct ib_umad_packet *sent_packet;
426 struct ib_mad_hdr *sent_hdr, *hdr;
427
428 hdr = (struct ib_mad_hdr *) packet->mad.data;
429 list_for_each_entry(sent_packet, &file->send_list, list) {
430 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
431
432 if ((hdr->tid != sent_hdr->tid) ||
433 (hdr->mgmt_class != sent_hdr->mgmt_class))
434 continue;
435
436 /*
437 * No need to be overly clever here. If two new operations have
438 * the same TID, reject the second as a duplicate. This is more
439 * restrictive than required by the spec.
440 */
441 if (!ib_response_mad(hdr)) {
442 if (!ib_response_mad(sent_hdr))
443 return 1;
444 continue;
445 } else if (!ib_response_mad(sent_hdr))
446 continue;
447
448 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
449 return 1;
450 }
451
452 return 0;
453 }
454
ib_umad_write(struct file * filp,const char __user * buf,size_t count,loff_t * pos)455 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
456 size_t count, loff_t *pos)
457 {
458 struct ib_umad_file *file = filp->private_data;
459 struct ib_umad_packet *packet;
460 struct ib_mad_agent *agent;
461 struct rdma_ah_attr ah_attr;
462 struct ib_ah *ah;
463 struct ib_rmpp_mad *rmpp_mad;
464 __be64 *tid;
465 int ret, data_len, hdr_len, copy_offset, rmpp_active;
466 u8 base_version;
467
468 if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
469 return -EINVAL;
470
471 packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
472 if (!packet)
473 return -ENOMEM;
474
475 if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
476 ret = -EFAULT;
477 goto err;
478 }
479
480 if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
481 ret = -EINVAL;
482 goto err;
483 }
484
485 buf += hdr_size(file);
486
487 if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
488 ret = -EFAULT;
489 goto err;
490 }
491
492 mutex_lock(&file->mutex);
493
494 agent = __get_agent(file, packet->mad.hdr.id);
495 if (!agent) {
496 ret = -EINVAL;
497 goto err_up;
498 }
499
500 memset(&ah_attr, 0, sizeof ah_attr);
501 ah_attr.type = rdma_ah_find_type(file->port->ib_dev,
502 file->port->port_num);
503 rdma_ah_set_dlid(&ah_attr, be16_to_cpu(packet->mad.hdr.lid));
504 rdma_ah_set_sl(&ah_attr, packet->mad.hdr.sl);
505 rdma_ah_set_path_bits(&ah_attr, packet->mad.hdr.path_bits);
506 rdma_ah_set_port_num(&ah_attr, file->port->port_num);
507 if (packet->mad.hdr.grh_present) {
508 rdma_ah_set_grh(&ah_attr, NULL,
509 be32_to_cpu(packet->mad.hdr.flow_label),
510 packet->mad.hdr.gid_index,
511 packet->mad.hdr.hop_limit,
512 packet->mad.hdr.traffic_class);
513 rdma_ah_set_dgid_raw(&ah_attr, packet->mad.hdr.gid);
514 }
515
516 ah = rdma_create_user_ah(agent->qp->pd, &ah_attr, NULL);
517 if (IS_ERR(ah)) {
518 ret = PTR_ERR(ah);
519 goto err_up;
520 }
521
522 rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
523 hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
524
525 if (ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
526 && ib_mad_kernel_rmpp_agent(agent)) {
527 copy_offset = IB_MGMT_RMPP_HDR;
528 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
529 IB_MGMT_RMPP_FLAG_ACTIVE;
530 } else {
531 copy_offset = IB_MGMT_MAD_HDR;
532 rmpp_active = 0;
533 }
534
535 base_version = ((struct ib_mad_hdr *)&packet->mad.data)->base_version;
536 data_len = count - hdr_size(file) - hdr_len;
537 packet->msg = ib_create_send_mad(agent,
538 be32_to_cpu(packet->mad.hdr.qpn),
539 packet->mad.hdr.pkey_index, rmpp_active,
540 hdr_len, data_len, GFP_KERNEL,
541 base_version);
542 if (IS_ERR(packet->msg)) {
543 ret = PTR_ERR(packet->msg);
544 goto err_ah;
545 }
546
547 packet->msg->ah = ah;
548 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
549 packet->msg->retries = packet->mad.hdr.retries;
550 packet->msg->context[0] = packet;
551
552 /* Copy MAD header. Any RMPP header is already in place. */
553 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
554
555 if (!rmpp_active) {
556 if (copy_from_user((char *)packet->msg->mad + copy_offset,
557 buf + copy_offset,
558 hdr_len + data_len - copy_offset)) {
559 ret = -EFAULT;
560 goto err_msg;
561 }
562 } else {
563 ret = copy_rmpp_mad(packet->msg, buf);
564 if (ret)
565 goto err_msg;
566 }
567
568 /*
569 * Set the high-order part of the transaction ID to make MADs from
570 * different agents unique, and allow routing responses back to the
571 * original requestor.
572 */
573 if (!ib_response_mad(packet->msg->mad)) {
574 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
575 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
576 (be64_to_cpup(tid) & 0xffffffff));
577 rmpp_mad->mad_hdr.tid = *tid;
578 }
579
580 if (!ib_mad_kernel_rmpp_agent(agent)
581 && ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
582 && (ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE)) {
583 spin_lock_irq(&file->send_lock);
584 list_add_tail(&packet->list, &file->send_list);
585 spin_unlock_irq(&file->send_lock);
586 } else {
587 spin_lock_irq(&file->send_lock);
588 ret = is_duplicate(file, packet);
589 if (!ret)
590 list_add_tail(&packet->list, &file->send_list);
591 spin_unlock_irq(&file->send_lock);
592 if (ret) {
593 ret = -EINVAL;
594 goto err_msg;
595 }
596 }
597
598 ret = ib_post_send_mad(packet->msg, NULL);
599 if (ret)
600 goto err_send;
601
602 mutex_unlock(&file->mutex);
603 return count;
604
605 err_send:
606 dequeue_send(file, packet);
607 err_msg:
608 ib_free_send_mad(packet->msg);
609 err_ah:
610 rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);
611 err_up:
612 mutex_unlock(&file->mutex);
613 err:
614 kfree(packet);
615 return ret;
616 }
617
ib_umad_poll(struct file * filp,struct poll_table_struct * wait)618 static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
619 {
620 struct ib_umad_file *file = filp->private_data;
621
622 /* we will always be able to post a MAD send */
623 unsigned int mask = POLLOUT | POLLWRNORM;
624
625 poll_wait(filp, &file->recv_wait, wait);
626
627 if (!list_empty(&file->recv_list))
628 mask |= POLLIN | POLLRDNORM;
629
630 return mask;
631 }
632
ib_umad_reg_agent(struct ib_umad_file * file,void __user * arg,int compat_method_mask)633 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
634 int compat_method_mask)
635 {
636 struct ib_user_mad_reg_req ureq;
637 struct ib_mad_reg_req req;
638 struct ib_mad_agent *agent = NULL;
639 int agent_id;
640 int ret;
641
642 mutex_lock(&file->port->file_mutex);
643 mutex_lock(&file->mutex);
644
645 if (!file->port->ib_dev) {
646 dev_notice(file->port->dev,
647 "ib_umad_reg_agent: invalid device\n");
648 ret = -EPIPE;
649 goto out;
650 }
651
652 if (copy_from_user(&ureq, arg, sizeof ureq)) {
653 ret = -EFAULT;
654 goto out;
655 }
656
657 if (ureq.qpn != 0 && ureq.qpn != 1) {
658 dev_notice(file->port->dev,
659 "ib_umad_reg_agent: invalid QPN %d specified\n",
660 ureq.qpn);
661 ret = -EINVAL;
662 goto out;
663 }
664
665 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
666 if (!__get_agent(file, agent_id))
667 goto found;
668
669 dev_notice(file->port->dev,
670 "ib_umad_reg_agent: Max Agents (%u) reached\n",
671 IB_UMAD_MAX_AGENTS);
672 ret = -ENOMEM;
673 goto out;
674
675 found:
676 if (ureq.mgmt_class) {
677 memset(&req, 0, sizeof(req));
678 req.mgmt_class = ureq.mgmt_class;
679 req.mgmt_class_version = ureq.mgmt_class_version;
680 memcpy(req.oui, ureq.oui, sizeof req.oui);
681
682 if (compat_method_mask) {
683 u32 *umm = (u32 *) ureq.method_mask;
684 int i;
685
686 for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
687 req.method_mask[i] =
688 umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
689 } else
690 memcpy(req.method_mask, ureq.method_mask,
691 sizeof req.method_mask);
692 }
693
694 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
695 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
696 ureq.mgmt_class ? &req : NULL,
697 ureq.rmpp_version,
698 send_handler, recv_handler, file, 0);
699 if (IS_ERR(agent)) {
700 ret = PTR_ERR(agent);
701 agent = NULL;
702 goto out;
703 }
704
705 if (put_user(agent_id,
706 (u32 __user *) ((char *)arg + offsetof(struct ib_user_mad_reg_req, id)))) {
707 ret = -EFAULT;
708 goto out;
709 }
710
711 if (!file->already_used) {
712 file->already_used = 1;
713 if (!file->use_pkey_index) {
714 dev_warn(file->port->dev,
715 "process %s did not enable P_Key index support.\n",
716 current->comm);
717 dev_warn(file->port->dev,
718 " Documentation/infiniband/user_mad.txt has info on the new ABI.\n");
719 }
720 }
721
722 file->agent[agent_id] = agent;
723 ret = 0;
724
725 out:
726 mutex_unlock(&file->mutex);
727
728 if (ret && agent)
729 ib_unregister_mad_agent(agent);
730
731 mutex_unlock(&file->port->file_mutex);
732
733 return ret;
734 }
735
ib_umad_reg_agent2(struct ib_umad_file * file,void __user * arg)736 static int ib_umad_reg_agent2(struct ib_umad_file *file, void __user *arg)
737 {
738 struct ib_user_mad_reg_req2 ureq;
739 struct ib_mad_reg_req req;
740 struct ib_mad_agent *agent = NULL;
741 int agent_id;
742 int ret;
743
744 mutex_lock(&file->port->file_mutex);
745 mutex_lock(&file->mutex);
746
747 if (!file->port->ib_dev) {
748 dev_notice(file->port->dev,
749 "ib_umad_reg_agent2: invalid device\n");
750 ret = -EPIPE;
751 goto out;
752 }
753
754 if (copy_from_user(&ureq, arg, sizeof(ureq))) {
755 ret = -EFAULT;
756 goto out;
757 }
758
759 if (ureq.qpn != 0 && ureq.qpn != 1) {
760 dev_notice(file->port->dev,
761 "ib_umad_reg_agent2: invalid QPN %d specified\n",
762 ureq.qpn);
763 ret = -EINVAL;
764 goto out;
765 }
766
767 if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) {
768 const u32 flags = IB_USER_MAD_REG_FLAGS_CAP;
769 dev_notice(file->port->dev,
770 "ib_umad_reg_agent2 failed: invalid registration flags specified 0x%x; supported 0x%x\n",
771 ureq.flags, IB_USER_MAD_REG_FLAGS_CAP);
772 ret = -EINVAL;
773
774 if (put_user(flags,
775 (u32 __user *) ((char *)arg + offsetof(struct
776 ib_user_mad_reg_req2, flags))))
777 ret = -EFAULT;
778
779 goto out;
780 }
781
782 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
783 if (!__get_agent(file, agent_id))
784 goto found;
785
786 dev_notice(file->port->dev,
787 "ib_umad_reg_agent2: Max Agents (%u) reached\n",
788 IB_UMAD_MAX_AGENTS);
789 ret = -ENOMEM;
790 goto out;
791
792 found:
793 if (ureq.mgmt_class) {
794 memset(&req, 0, sizeof(req));
795 req.mgmt_class = ureq.mgmt_class;
796 req.mgmt_class_version = ureq.mgmt_class_version;
797 if (ureq.oui & 0xff000000) {
798 dev_notice(file->port->dev,
799 "ib_umad_reg_agent2 failed: oui invalid 0x%08x\n",
800 ureq.oui);
801 ret = -EINVAL;
802 goto out;
803 }
804 req.oui[2] = ureq.oui & 0x0000ff;
805 req.oui[1] = (ureq.oui & 0x00ff00) >> 8;
806 req.oui[0] = (ureq.oui & 0xff0000) >> 16;
807 memcpy(req.method_mask, ureq.method_mask,
808 sizeof(req.method_mask));
809 }
810
811 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
812 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
813 ureq.mgmt_class ? &req : NULL,
814 ureq.rmpp_version,
815 send_handler, recv_handler, file,
816 ureq.flags);
817 if (IS_ERR(agent)) {
818 ret = PTR_ERR(agent);
819 agent = NULL;
820 goto out;
821 }
822
823 if (put_user(agent_id,
824 (u32 __user *)((char *)arg +
825 offsetof(struct ib_user_mad_reg_req2, id)))) {
826 ret = -EFAULT;
827 goto out;
828 }
829
830 if (!file->already_used) {
831 file->already_used = 1;
832 file->use_pkey_index = 1;
833 }
834
835 file->agent[agent_id] = agent;
836 ret = 0;
837
838 out:
839 mutex_unlock(&file->mutex);
840
841 if (ret && agent)
842 ib_unregister_mad_agent(agent);
843
844 mutex_unlock(&file->port->file_mutex);
845
846 return ret;
847 }
848
849
ib_umad_unreg_agent(struct ib_umad_file * file,u32 __user * arg)850 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
851 {
852 struct ib_mad_agent *agent = NULL;
853 u32 id;
854 int ret = 0;
855
856 if (get_user(id, arg))
857 return -EFAULT;
858
859 mutex_lock(&file->port->file_mutex);
860 mutex_lock(&file->mutex);
861
862 if (id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
863 ret = -EINVAL;
864 goto out;
865 }
866
867 agent = file->agent[id];
868 file->agent[id] = NULL;
869
870 out:
871 mutex_unlock(&file->mutex);
872
873 if (agent)
874 ib_unregister_mad_agent(agent);
875
876 mutex_unlock(&file->port->file_mutex);
877
878 return ret;
879 }
880
ib_umad_enable_pkey(struct ib_umad_file * file)881 static long ib_umad_enable_pkey(struct ib_umad_file *file)
882 {
883 int ret = 0;
884
885 mutex_lock(&file->mutex);
886 if (file->already_used)
887 ret = -EINVAL;
888 else
889 file->use_pkey_index = 1;
890 mutex_unlock(&file->mutex);
891
892 return ret;
893 }
894
ib_umad_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)895 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
896 unsigned long arg)
897 {
898 switch (cmd) {
899 case IB_USER_MAD_REGISTER_AGENT:
900 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
901 case IB_USER_MAD_UNREGISTER_AGENT:
902 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
903 case IB_USER_MAD_ENABLE_PKEY:
904 return ib_umad_enable_pkey(filp->private_data);
905 case IB_USER_MAD_REGISTER_AGENT2:
906 return ib_umad_reg_agent2(filp->private_data, (void __user *) arg);
907 default:
908 return -ENOIOCTLCMD;
909 }
910 }
911
912 #ifdef CONFIG_COMPAT
ib_umad_compat_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)913 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
914 unsigned long arg)
915 {
916 switch (cmd) {
917 case IB_USER_MAD_REGISTER_AGENT:
918 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
919 case IB_USER_MAD_UNREGISTER_AGENT:
920 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
921 case IB_USER_MAD_ENABLE_PKEY:
922 return ib_umad_enable_pkey(filp->private_data);
923 case IB_USER_MAD_REGISTER_AGENT2:
924 return ib_umad_reg_agent2(filp->private_data, compat_ptr(arg));
925 default:
926 return -ENOIOCTLCMD;
927 }
928 }
929 #endif
930
931 /*
932 * ib_umad_open() does not need the BKL:
933 *
934 * - the ib_umad_port structures are properly reference counted, and
935 * everything else is purely local to the file being created, so
936 * races against other open calls are not a problem;
937 * - the ioctl method does not affect any global state outside of the
938 * file structure being operated on;
939 */
ib_umad_open(struct inode * inode,struct file * filp)940 static int ib_umad_open(struct inode *inode, struct file *filp)
941 {
942 struct ib_umad_port *port;
943 struct ib_umad_file *file;
944 int ret = -ENXIO;
945
946 port = container_of(inode->i_cdev->si_drv1, struct ib_umad_port, cdev);
947
948 mutex_lock(&port->file_mutex);
949
950 if (!port->ib_dev)
951 goto out;
952
953 ret = -ENOMEM;
954 file = kzalloc(sizeof *file, GFP_KERNEL);
955 if (!file)
956 goto out;
957
958 mutex_init(&file->mutex);
959 spin_lock_init(&file->send_lock);
960 INIT_LIST_HEAD(&file->recv_list);
961 INIT_LIST_HEAD(&file->send_list);
962 init_waitqueue_head(&file->recv_wait);
963
964 file->port = port;
965 filp->private_data = file;
966
967 list_add_tail(&file->port_list, &port->file_list);
968
969 ret = nonseekable_open(inode, filp);
970 if (ret) {
971 list_del(&file->port_list);
972 kfree(file);
973 goto out;
974 }
975
976 kobject_get(&port->umad_dev->kobj);
977
978 out:
979 mutex_unlock(&port->file_mutex);
980 return ret;
981 }
982
ib_umad_close(struct inode * inode,struct file * filp)983 static int ib_umad_close(struct inode *inode, struct file *filp)
984 {
985 struct ib_umad_file *file = filp->private_data;
986 struct ib_umad_device *dev = file->port->umad_dev;
987 struct ib_umad_packet *packet, *tmp;
988 int already_dead;
989 int i;
990
991 mutex_lock(&file->port->file_mutex);
992 mutex_lock(&file->mutex);
993
994 already_dead = file->agents_dead;
995 file->agents_dead = 1;
996
997 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
998 if (packet->recv_wc)
999 ib_free_recv_mad(packet->recv_wc);
1000 kfree(packet);
1001 }
1002
1003 list_del(&file->port_list);
1004
1005 mutex_unlock(&file->mutex);
1006
1007 if (!already_dead)
1008 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
1009 if (file->agent[i])
1010 ib_unregister_mad_agent(file->agent[i]);
1011
1012 mutex_unlock(&file->port->file_mutex);
1013
1014 kfree(file);
1015 kobject_put(&dev->kobj);
1016
1017 return 0;
1018 }
1019
1020 static const struct file_operations umad_fops = {
1021 .owner = THIS_MODULE,
1022 .read = ib_umad_read,
1023 .write = ib_umad_write,
1024 .poll = ib_umad_poll,
1025 .unlocked_ioctl = ib_umad_ioctl,
1026 #ifdef CONFIG_COMPAT
1027 .compat_ioctl = ib_umad_compat_ioctl,
1028 #endif
1029 .open = ib_umad_open,
1030 .release = ib_umad_close,
1031 .llseek = no_llseek,
1032 };
1033
ib_umad_sm_open(struct inode * inode,struct file * filp)1034 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
1035 {
1036 struct ib_umad_port *port;
1037 struct ib_port_modify props = {
1038 .set_port_cap_mask = IB_PORT_SM
1039 };
1040 int ret;
1041
1042 port = container_of(inode->i_cdev->si_drv1, struct ib_umad_port, sm_cdev);
1043
1044 if (filp->f_flags & O_NONBLOCK) {
1045 if (down_trylock(&port->sm_sem)) {
1046 ret = -EAGAIN;
1047 goto fail;
1048 }
1049 } else {
1050 if (down_interruptible(&port->sm_sem)) {
1051 ret = -ERESTARTSYS;
1052 goto fail;
1053 }
1054 }
1055
1056 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1057 if (ret)
1058 goto err_up_sem;
1059
1060 filp->private_data = port;
1061
1062 ret = nonseekable_open(inode, filp);
1063 if (ret)
1064 goto err_clr_sm_cap;
1065
1066 kobject_get(&port->umad_dev->kobj);
1067
1068 return 0;
1069
1070 err_clr_sm_cap:
1071 swap(props.set_port_cap_mask, props.clr_port_cap_mask);
1072 ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1073
1074 err_up_sem:
1075 up(&port->sm_sem);
1076
1077 fail:
1078 return ret;
1079 }
1080
ib_umad_sm_close(struct inode * inode,struct file * filp)1081 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
1082 {
1083 struct ib_umad_port *port = filp->private_data;
1084 struct ib_port_modify props = {
1085 .clr_port_cap_mask = IB_PORT_SM
1086 };
1087 int ret = 0;
1088
1089 mutex_lock(&port->file_mutex);
1090 if (port->ib_dev)
1091 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1092 mutex_unlock(&port->file_mutex);
1093
1094 up(&port->sm_sem);
1095
1096 kobject_put(&port->umad_dev->kobj);
1097
1098 return ret;
1099 }
1100
1101 static const struct file_operations umad_sm_fops = {
1102 .owner = THIS_MODULE,
1103 .open = ib_umad_sm_open,
1104 .release = ib_umad_sm_close,
1105 .llseek = no_llseek,
1106 };
1107
1108 static struct ib_client umad_client = {
1109 .name = "umad",
1110 .add = ib_umad_add_one,
1111 .remove = ib_umad_remove_one
1112 };
1113
show_ibdev(struct device * dev,struct device_attribute * attr,char * buf)1114 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
1115 char *buf)
1116 {
1117 struct ib_umad_port *port = dev_get_drvdata(dev);
1118
1119 if (!port)
1120 return -ENODEV;
1121
1122 return sprintf(buf, "%s\n", port->ib_dev->name);
1123 }
1124 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1125
show_port(struct device * dev,struct device_attribute * attr,char * buf)1126 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
1127 char *buf)
1128 {
1129 struct ib_umad_port *port = dev_get_drvdata(dev);
1130
1131 if (!port)
1132 return -ENODEV;
1133
1134 return sprintf(buf, "%d\n", port->port_num);
1135 }
1136 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1137
1138 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1139 __stringify(IB_USER_MAD_ABI_VERSION));
1140
1141 static dev_t overflow_maj;
1142 static DECLARE_BITMAP(overflow_map, IB_UMAD_MAX_PORTS);
find_overflow_devnum(struct ib_device * device)1143 static int find_overflow_devnum(struct ib_device *device)
1144 {
1145 int ret;
1146
1147 if (!overflow_maj) {
1148 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UMAD_MAX_PORTS * 2,
1149 "infiniband_mad");
1150 if (ret) {
1151 dev_err(&device->dev,
1152 "couldn't register dynamic device number\n");
1153 return ret;
1154 }
1155 }
1156
1157 ret = find_first_zero_bit(overflow_map, IB_UMAD_MAX_PORTS);
1158 if (ret >= IB_UMAD_MAX_PORTS)
1159 return -1;
1160
1161 return ret;
1162 }
1163
ib_umad_init_port(struct ib_device * device,int port_num,struct ib_umad_device * umad_dev,struct ib_umad_port * port)1164 static int ib_umad_init_port(struct ib_device *device, int port_num,
1165 struct ib_umad_device *umad_dev,
1166 struct ib_umad_port *port)
1167 {
1168 int devnum;
1169 dev_t base;
1170
1171 spin_lock(&port_lock);
1172 devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS);
1173 if (devnum >= IB_UMAD_MAX_PORTS) {
1174 spin_unlock(&port_lock);
1175 devnum = find_overflow_devnum(device);
1176 if (devnum < 0)
1177 return -1;
1178
1179 spin_lock(&port_lock);
1180 port->dev_num = devnum + IB_UMAD_MAX_PORTS;
1181 base = devnum + overflow_maj;
1182 set_bit(devnum, overflow_map);
1183 } else {
1184 port->dev_num = devnum;
1185 base = devnum + base_dev;
1186 set_bit(devnum, dev_map);
1187 }
1188 spin_unlock(&port_lock);
1189
1190 port->ib_dev = device;
1191 port->port_num = port_num;
1192 sema_init(&port->sm_sem, 1);
1193 mutex_init(&port->file_mutex);
1194 INIT_LIST_HEAD(&port->file_list);
1195
1196 cdev_init(&port->cdev, &umad_fops);
1197 port->cdev.owner = THIS_MODULE;
1198 port->cdev.kobj.parent = &umad_dev->kobj;
1199 kobject_set_name(&port->cdev.kobj, "umad%d", port->dev_num);
1200 if (cdev_add(&port->cdev, base, 1))
1201 goto err_cdev;
1202
1203 port->dev = device_create(umad_class, device->dma_device,
1204 port->cdev.dev, port,
1205 "umad%d", port->dev_num);
1206 if (IS_ERR(port->dev))
1207 goto err_cdev;
1208
1209 if (device_create_file(port->dev, &dev_attr_ibdev))
1210 goto err_dev;
1211 if (device_create_file(port->dev, &dev_attr_port))
1212 goto err_dev;
1213
1214 base += IB_UMAD_MAX_PORTS;
1215 cdev_init(&port->sm_cdev, &umad_sm_fops);
1216 port->sm_cdev.owner = THIS_MODULE;
1217 port->sm_cdev.kobj.parent = &umad_dev->kobj;
1218 kobject_set_name(&port->sm_cdev.kobj, "issm%d", port->dev_num);
1219 if (cdev_add(&port->sm_cdev, base, 1))
1220 goto err_sm_cdev;
1221
1222 port->sm_dev = device_create(umad_class, device->dma_device,
1223 port->sm_cdev.dev, port,
1224 "issm%d", port->dev_num);
1225 if (IS_ERR(port->sm_dev))
1226 goto err_sm_cdev;
1227
1228 if (device_create_file(port->sm_dev, &dev_attr_ibdev))
1229 goto err_sm_dev;
1230 if (device_create_file(port->sm_dev, &dev_attr_port))
1231 goto err_sm_dev;
1232
1233 return 0;
1234
1235 err_sm_dev:
1236 device_destroy(umad_class, port->sm_cdev.dev);
1237
1238 err_sm_cdev:
1239 cdev_del(&port->sm_cdev);
1240
1241 err_dev:
1242 device_destroy(umad_class, port->cdev.dev);
1243
1244 err_cdev:
1245 cdev_del(&port->cdev);
1246 if (port->dev_num < IB_UMAD_MAX_PORTS)
1247 clear_bit(devnum, dev_map);
1248 else
1249 clear_bit(devnum, overflow_map);
1250
1251 return -1;
1252 }
1253
ib_umad_kill_port(struct ib_umad_port * port)1254 static void ib_umad_kill_port(struct ib_umad_port *port)
1255 {
1256 struct ib_umad_file *file;
1257 int id;
1258
1259 dev_set_drvdata(port->dev, NULL);
1260 dev_set_drvdata(port->sm_dev, NULL);
1261
1262 device_destroy(umad_class, port->cdev.dev);
1263 device_destroy(umad_class, port->sm_cdev.dev);
1264
1265 cdev_del(&port->cdev);
1266 cdev_del(&port->sm_cdev);
1267
1268 mutex_lock(&port->file_mutex);
1269
1270 port->ib_dev = NULL;
1271
1272 list_for_each_entry(file, &port->file_list, port_list) {
1273 mutex_lock(&file->mutex);
1274 file->agents_dead = 1;
1275 mutex_unlock(&file->mutex);
1276
1277 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1278 if (file->agent[id])
1279 ib_unregister_mad_agent(file->agent[id]);
1280 }
1281
1282 mutex_unlock(&port->file_mutex);
1283
1284 if (port->dev_num < IB_UMAD_MAX_PORTS)
1285 clear_bit(port->dev_num, dev_map);
1286 else
1287 clear_bit(port->dev_num - IB_UMAD_MAX_PORTS, overflow_map);
1288 }
1289
ib_umad_add_one(struct ib_device * device)1290 static void ib_umad_add_one(struct ib_device *device)
1291 {
1292 struct ib_umad_device *umad_dev;
1293 int s, e, i;
1294 int count = 0;
1295
1296 s = rdma_start_port(device);
1297 e = rdma_end_port(device);
1298
1299 umad_dev = kzalloc(sizeof *umad_dev +
1300 (e - s + 1) * sizeof (struct ib_umad_port),
1301 GFP_KERNEL);
1302 if (!umad_dev)
1303 return;
1304
1305 kobject_init(&umad_dev->kobj, &ib_umad_dev_ktype);
1306
1307 for (i = s; i <= e; ++i) {
1308 if (!rdma_cap_ib_mad(device, i))
1309 continue;
1310
1311 umad_dev->port[i - s].umad_dev = umad_dev;
1312
1313 if (ib_umad_init_port(device, i, umad_dev,
1314 &umad_dev->port[i - s]))
1315 goto err;
1316
1317 count++;
1318 }
1319
1320 if (!count)
1321 goto free;
1322
1323 ib_set_client_data(device, &umad_client, umad_dev);
1324
1325 return;
1326
1327 err:
1328 while (--i >= s) {
1329 if (!rdma_cap_ib_mad(device, i))
1330 continue;
1331
1332 ib_umad_kill_port(&umad_dev->port[i - s]);
1333 }
1334 free:
1335 kobject_put(&umad_dev->kobj);
1336 }
1337
ib_umad_remove_one(struct ib_device * device,void * client_data)1338 static void ib_umad_remove_one(struct ib_device *device, void *client_data)
1339 {
1340 struct ib_umad_device *umad_dev = client_data;
1341 int i;
1342
1343 if (!umad_dev)
1344 return;
1345
1346 for (i = 0; i <= rdma_end_port(device) - rdma_start_port(device); ++i) {
1347 if (rdma_cap_ib_mad(device, i + rdma_start_port(device)))
1348 ib_umad_kill_port(&umad_dev->port[i]);
1349 }
1350
1351 kobject_put(&umad_dev->kobj);
1352 }
1353
umad_devnode(struct device * dev,umode_t * mode)1354 static char *umad_devnode(struct device *dev, umode_t *mode)
1355 {
1356 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1357 }
1358
ib_umad_init(void)1359 static int __init ib_umad_init(void)
1360 {
1361 int ret;
1362
1363 ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2,
1364 "infiniband_mad");
1365 if (ret) {
1366 pr_err("couldn't register device number\n");
1367 goto out;
1368 }
1369
1370 umad_class = class_create(THIS_MODULE, "infiniband_mad");
1371 if (IS_ERR(umad_class)) {
1372 ret = PTR_ERR(umad_class);
1373 pr_err("couldn't create class infiniband_mad\n");
1374 goto out_chrdev;
1375 }
1376
1377 umad_class->devnode = umad_devnode;
1378
1379 ret = class_create_file(umad_class, &class_attr_abi_version.attr);
1380 if (ret) {
1381 pr_err("couldn't create abi_version attribute\n");
1382 goto out_class;
1383 }
1384
1385 ret = ib_register_client(&umad_client);
1386 if (ret) {
1387 pr_err("couldn't register ib_umad client\n");
1388 goto out_class;
1389 }
1390
1391 return 0;
1392
1393 out_class:
1394 class_destroy(umad_class);
1395
1396 out_chrdev:
1397 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1398
1399 out:
1400 return ret;
1401 }
1402
ib_umad_cleanup(void)1403 static void __exit ib_umad_cleanup(void)
1404 {
1405 ib_unregister_client(&umad_client);
1406 class_destroy(umad_class);
1407 unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2);
1408 if (overflow_maj)
1409 unregister_chrdev_region(overflow_maj, IB_UMAD_MAX_PORTS * 2);
1410 }
1411
1412 module_init_order(ib_umad_init, SI_ORDER_FIFTH);
1413 module_exit_order(ib_umad_cleanup, SI_ORDER_FIFTH);
1414