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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / infiniband / core / user_mad.c
blob19104a6756915b26bccc8a02789644b0658ceeb4
1 /*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
4 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
5 * Copyright (c) 2008 Cisco. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 */
35
36 #define pr_fmt(fmt) "user_mad: " fmt
37
38 #include <linux/module.h>
39 #include <linux/init.h>
40 #include <linux/device.h>
41 #include <linux/err.h>
42 #include <linux/fs.h>
43 #include <linux/cdev.h>
44 #include <linux/dma-mapping.h>
45 #include <linux/poll.h>
46 #include <linux/mutex.h>
47 #include <linux/kref.h>
48 #include <linux/compat.h>
49 #include <linux/sched.h>
50 #include <linux/semaphore.h>
51 #include <linux/slab.h>
52 #include <linux/nospec.h>
53
54 #include <linux/uaccess.h>
55
56 #include <rdma/ib_mad.h>
57 #include <rdma/ib_user_mad.h>
58 #include <rdma/rdma_netlink.h>
59
60 #include "core_priv.h"
61
62 MODULE_AUTHOR("Roland Dreier");
63 MODULE_DESCRIPTION("InfiniBand userspace MAD packet access");
64 MODULE_LICENSE("Dual BSD/GPL");
65
66 enum {
67 IB_UMAD_MAX_PORTS = RDMA_MAX_PORTS,
68 IB_UMAD_MAX_AGENTS = 32,
69
70 IB_UMAD_MAJOR = 231,
71 IB_UMAD_MINOR_BASE = 0,
72 IB_UMAD_NUM_FIXED_MINOR = 64,
73 IB_UMAD_NUM_DYNAMIC_MINOR = IB_UMAD_MAX_PORTS - IB_UMAD_NUM_FIXED_MINOR,
74 IB_ISSM_MINOR_BASE = IB_UMAD_NUM_FIXED_MINOR,
75 };
76
77 /*
78 * Our lifetime rules for these structs are the following:
79 * device special file is opened, we take a reference on the
80 * ib_umad_port's struct ib_umad_device. We drop these
81 * references in the corresponding close().
82 *
83 * In addition to references coming from open character devices, there
84 * is one more reference to each ib_umad_device representing the
85 * module's reference taken when allocating the ib_umad_device in
86 * ib_umad_add_one().
87 *
88 * When destroying an ib_umad_device, we drop the module's reference.
89 */
90
91 struct ib_umad_port {
92 struct cdev cdev;
93 struct device dev;
94 struct cdev sm_cdev;
95 struct device sm_dev;
96 struct semaphore sm_sem;
97
98 struct mutex file_mutex;
99 struct list_head file_list;
100
101 struct ib_device *ib_dev;
102 struct ib_umad_device *umad_dev;
103 int dev_num;
104 u8 port_num;
105 };
106
107 struct ib_umad_device {
108 struct kref kref;
109 struct ib_umad_port ports[];
110 };
111
112 struct ib_umad_file {
113 struct mutex mutex;
114 struct ib_umad_port *port;
115 struct list_head recv_list;
116 struct list_head send_list;
117 struct list_head port_list;
118 spinlock_t send_lock;
119 wait_queue_head_t recv_wait;
120 struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS];
121 int agents_dead;
122 u8 use_pkey_index;
123 u8 already_used;
124 };
125
126 struct ib_umad_packet {
127 struct ib_mad_send_buf *msg;
128 struct ib_mad_recv_wc *recv_wc;
129 struct list_head list;
130 int length;
131 struct ib_user_mad mad;
132 };
133
134 #define CREATE_TRACE_POINTS
135 #include <trace/events/ib_umad.h>
136
137 static const dev_t base_umad_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
138 static const dev_t base_issm_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE) +
139 IB_UMAD_NUM_FIXED_MINOR;
140 static dev_t dynamic_umad_dev;
141 static dev_t dynamic_issm_dev;
142
143 static DEFINE_IDA(umad_ida);
144
145 static int ib_umad_add_one(struct ib_device *device);
146 static void ib_umad_remove_one(struct ib_device *device, void *client_data);
147
148 static void ib_umad_dev_free(struct kref *kref)
149 {
150 struct ib_umad_device *dev =
151 container_of(kref, struct ib_umad_device, kref);
152
153 kfree(dev);
154 }
155
156 static void ib_umad_dev_get(struct ib_umad_device *dev)
157 {
158 kref_get(&dev->kref);
159 }
160
161 static void ib_umad_dev_put(struct ib_umad_device *dev)
162 {
163 kref_put(&dev->kref, ib_umad_dev_free);
164 }
165
166 static int hdr_size(struct ib_umad_file *file)
167 {
168 return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) :
169 sizeof (struct ib_user_mad_hdr_old);
170 }
171
172 /* caller must hold file->mutex */
173 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
174 {
175 return file->agents_dead ? NULL : file->agent[id];
176 }
177
178 static int queue_packet(struct ib_umad_file *file,
179 struct ib_mad_agent *agent,
180 struct ib_umad_packet *packet)
181 {
182 int ret = 1;
183
184 mutex_lock(&file->mutex);
185
186 for (packet->mad.hdr.id = 0;
187 packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
188 packet->mad.hdr.id++)
189 if (agent == __get_agent(file, packet->mad.hdr.id)) {
190 list_add_tail(&packet->list, &file->recv_list);
191 wake_up_interruptible(&file->recv_wait);
192 ret = 0;
193 break;
194 }
195
196 mutex_unlock(&file->mutex);
197
198 return ret;
199 }
200
201 static void dequeue_send(struct ib_umad_file *file,
202 struct ib_umad_packet *packet)
203 {
204 spin_lock_irq(&file->send_lock);
205 list_del(&packet->list);
206 spin_unlock_irq(&file->send_lock);
207 }
208
209 static void send_handler(struct ib_mad_agent *agent,
210 struct ib_mad_send_wc *send_wc)
211 {
212 struct ib_umad_file *file = agent->context;
213 struct ib_umad_packet *packet = send_wc->send_buf->context[0];
214
215 dequeue_send(file, packet);
216 rdma_destroy_ah(packet->msg->ah, RDMA_DESTROY_AH_SLEEPABLE);
217 ib_free_send_mad(packet->msg);
218
219 if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
220 packet->length = IB_MGMT_MAD_HDR;
221 packet->mad.hdr.status = ETIMEDOUT;
222 if (!queue_packet(file, agent, packet))
223 return;
224 }
225 kfree(packet);
226 }
227
228 static void recv_handler(struct ib_mad_agent *agent,
229 struct ib_mad_send_buf *send_buf,
230 struct ib_mad_recv_wc *mad_recv_wc)
231 {
232 struct ib_umad_file *file = agent->context;
233 struct ib_umad_packet *packet;
234
235 if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
236 goto err1;
237
238 packet = kzalloc(sizeof *packet, GFP_KERNEL);
239 if (!packet)
240 goto err1;
241
242 packet->length = mad_recv_wc->mad_len;
243 packet->recv_wc = mad_recv_wc;
244
245 packet->mad.hdr.status = 0;
246 packet->mad.hdr.length = hdr_size(file) + mad_recv_wc->mad_len;
247 packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp);
248 /*
249 * On OPA devices it is okay to lose the upper 16 bits of LID as this
250 * information is obtained elsewhere. Mask off the upper 16 bits.
251 */
252 if (rdma_cap_opa_mad(agent->device, agent->port_num))
253 packet->mad.hdr.lid = ib_lid_be16(0xFFFF &
254 mad_recv_wc->wc->slid);
255 else
256 packet->mad.hdr.lid = ib_lid_be16(mad_recv_wc->wc->slid);
257 packet->mad.hdr.sl = mad_recv_wc->wc->sl;
258 packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits;
259 packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;
260 packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
261 if (packet->mad.hdr.grh_present) {
262 struct rdma_ah_attr ah_attr;
263 const struct ib_global_route *grh;
264 int ret;
265
266 ret = ib_init_ah_attr_from_wc(agent->device, agent->port_num,
267 mad_recv_wc->wc,
268 mad_recv_wc->recv_buf.grh,
269 &ah_attr);
270 if (ret)
271 goto err2;
272
273 grh = rdma_ah_read_grh(&ah_attr);
274 packet->mad.hdr.gid_index = grh->sgid_index;
275 packet->mad.hdr.hop_limit = grh->hop_limit;
276 packet->mad.hdr.traffic_class = grh->traffic_class;
277 memcpy(packet->mad.hdr.gid, &grh->dgid, 16);
278 packet->mad.hdr.flow_label = cpu_to_be32(grh->flow_label);
279 rdma_destroy_ah_attr(&ah_attr);
280 }
281
282 if (queue_packet(file, agent, packet))
283 goto err2;
284 return;
285
286 err2:
287 kfree(packet);
288 err1:
289 ib_free_recv_mad(mad_recv_wc);
290 }
291
292 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
293 struct ib_umad_packet *packet, size_t count)
294 {
295 struct ib_mad_recv_buf *recv_buf;
296 int left, seg_payload, offset, max_seg_payload;
297 size_t seg_size;
298
299 recv_buf = &packet->recv_wc->recv_buf;
300 seg_size = packet->recv_wc->mad_seg_size;
301
302 /* We need enough room to copy the first (or only) MAD segment. */
303 if ((packet->length <= seg_size &&
304 count < hdr_size(file) + packet->length) ||
305 (packet->length > seg_size &&
306 count < hdr_size(file) + seg_size))
307 return -EINVAL;
308
309 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
310 return -EFAULT;
311
312 buf += hdr_size(file);
313 seg_payload = min_t(int, packet->length, seg_size);
314 if (copy_to_user(buf, recv_buf->mad, seg_payload))
315 return -EFAULT;
316
317 if (seg_payload < packet->length) {
318 /*
319 * Multipacket RMPP MAD message. Copy remainder of message.
320 * Note that last segment may have a shorter payload.
321 */
322 if (count < hdr_size(file) + packet->length) {
323 /*
324 * The buffer is too small, return the first RMPP segment,
325 * which includes the RMPP message length.
326 */
327 return -ENOSPC;
328 }
329 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
330 max_seg_payload = seg_size - offset;
331
332 for (left = packet->length - seg_payload, buf += seg_payload;
333 left; left -= seg_payload, buf += seg_payload) {
334 recv_buf = container_of(recv_buf->list.next,
335 struct ib_mad_recv_buf, list);
336 seg_payload = min(left, max_seg_payload);
337 if (copy_to_user(buf, ((void *) recv_buf->mad) + offset,
338 seg_payload))
339 return -EFAULT;
340 }
341 }
342
343 trace_ib_umad_read_recv(file, &packet->mad.hdr, &recv_buf->mad->mad_hdr);
344
345 return hdr_size(file) + packet->length;
346 }
347
348 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
349 struct ib_umad_packet *packet, size_t count)
350 {
351 ssize_t size = hdr_size(file) + packet->length;
352
353 if (count < size)
354 return -EINVAL;
355
356 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
357 return -EFAULT;
358
359 buf += hdr_size(file);
360
361 if (copy_to_user(buf, packet->mad.data, packet->length))
362 return -EFAULT;
363
364 trace_ib_umad_read_send(file, &packet->mad.hdr,
365 (struct ib_mad_hdr *)&packet->mad.data);
366
367 return size;
368 }
369
370 static ssize_t ib_umad_read(struct file *filp, char __user *buf,
371 size_t count, loff_t *pos)
372 {
373 struct ib_umad_file *file = filp->private_data;
374 struct ib_umad_packet *packet;
375 ssize_t ret;
376
377 if (count < hdr_size(file))
378 return -EINVAL;
379
380 mutex_lock(&file->mutex);
381
382 while (list_empty(&file->recv_list)) {
383 mutex_unlock(&file->mutex);
384
385 if (filp->f_flags & O_NONBLOCK)
386 return -EAGAIN;
387
388 if (wait_event_interruptible(file->recv_wait,
389 !list_empty(&file->recv_list)))
390 return -ERESTARTSYS;
391
392 mutex_lock(&file->mutex);
393 }
394
395 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
396 list_del(&packet->list);
397
398 mutex_unlock(&file->mutex);
399
400 if (packet->recv_wc)
401 ret = copy_recv_mad(file, buf, packet, count);
402 else
403 ret = copy_send_mad(file, buf, packet, count);
404
405 if (ret < 0) {
406 /* Requeue packet */
407 mutex_lock(&file->mutex);
408 list_add(&packet->list, &file->recv_list);
409 mutex_unlock(&file->mutex);
410 } else {
411 if (packet->recv_wc)
412 ib_free_recv_mad(packet->recv_wc);
413 kfree(packet);
414 }
415 return ret;
416 }
417
418 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
419 {
420 int left, seg;
421
422 /* Copy class specific header */
423 if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
424 copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
425 msg->hdr_len - IB_MGMT_RMPP_HDR))
426 return -EFAULT;
427
428 /* All headers are in place. Copy data segments. */
429 for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
430 seg++, left -= msg->seg_size, buf += msg->seg_size) {
431 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
432 min(left, msg->seg_size)))
433 return -EFAULT;
434 }
435 return 0;
436 }
437
438 static int same_destination(struct ib_user_mad_hdr *hdr1,
439 struct ib_user_mad_hdr *hdr2)
440 {
441 if (!hdr1->grh_present && !hdr2->grh_present)
442 return (hdr1->lid == hdr2->lid);
443
444 if (hdr1->grh_present && hdr2->grh_present)
445 return !memcmp(hdr1->gid, hdr2->gid, 16);
446
447 return 0;
448 }
449
450 static int is_duplicate(struct ib_umad_file *file,
451 struct ib_umad_packet *packet)
452 {
453 struct ib_umad_packet *sent_packet;
454 struct ib_mad_hdr *sent_hdr, *hdr;
455
456 hdr = (struct ib_mad_hdr *) packet->mad.data;
457 list_for_each_entry(sent_packet, &file->send_list, list) {
458 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
459
460 if ((hdr->tid != sent_hdr->tid) ||
461 (hdr->mgmt_class != sent_hdr->mgmt_class))
462 continue;
463
464 /*
465 * No need to be overly clever here. If two new operations have
466 * the same TID, reject the second as a duplicate. This is more
467 * restrictive than required by the spec.
468 */
469 if (!ib_response_mad(hdr)) {
470 if (!ib_response_mad(sent_hdr))
471 return 1;
472 continue;
473 } else if (!ib_response_mad(sent_hdr))
474 continue;
475
476 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
477 return 1;
478 }
479
480 return 0;
481 }
482
483 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
484 size_t count, loff_t *pos)
485 {
486 struct ib_umad_file *file = filp->private_data;
487 struct ib_umad_packet *packet;
488 struct ib_mad_agent *agent;
489 struct rdma_ah_attr ah_attr;
490 struct ib_ah *ah;
491 struct ib_rmpp_mad *rmpp_mad;
492 __be64 *tid;
493 int ret, data_len, hdr_len, copy_offset, rmpp_active;
494 u8 base_version;
495
496 if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
497 return -EINVAL;
498
499 packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
500 if (!packet)
501 return -ENOMEM;
502
503 if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
504 ret = -EFAULT;
505 goto err;
506 }
507
508 if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
509 ret = -EINVAL;
510 goto err;
511 }
512
513 buf += hdr_size(file);
514
515 if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
516 ret = -EFAULT;
517 goto err;
518 }
519
520 mutex_lock(&file->mutex);
521
522 trace_ib_umad_write(file, &packet->mad.hdr,
523 (struct ib_mad_hdr *)&packet->mad.data);
524
525 agent = __get_agent(file, packet->mad.hdr.id);
526 if (!agent) {
527 ret = -EINVAL;
528 goto err_up;
529 }
530
531 memset(&ah_attr, 0, sizeof ah_attr);
532 ah_attr.type = rdma_ah_find_type(agent->device,
533 file->port->port_num);
534 rdma_ah_set_dlid(&ah_attr, be16_to_cpu(packet->mad.hdr.lid));
535 rdma_ah_set_sl(&ah_attr, packet->mad.hdr.sl);
536 rdma_ah_set_path_bits(&ah_attr, packet->mad.hdr.path_bits);
537 rdma_ah_set_port_num(&ah_attr, file->port->port_num);
538 if (packet->mad.hdr.grh_present) {
539 rdma_ah_set_grh(&ah_attr, NULL,
540 be32_to_cpu(packet->mad.hdr.flow_label),
541 packet->mad.hdr.gid_index,
542 packet->mad.hdr.hop_limit,
543 packet->mad.hdr.traffic_class);
544 rdma_ah_set_dgid_raw(&ah_attr, packet->mad.hdr.gid);
545 }
546
547 ah = rdma_create_user_ah(agent->qp->pd, &ah_attr, NULL);
548 if (IS_ERR(ah)) {
549 ret = PTR_ERR(ah);
550 goto err_up;
551 }
552
553 rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
554 hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
555
556 if (ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
557 && ib_mad_kernel_rmpp_agent(agent)) {
558 copy_offset = IB_MGMT_RMPP_HDR;
559 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
560 IB_MGMT_RMPP_FLAG_ACTIVE;
561 } else {
562 copy_offset = IB_MGMT_MAD_HDR;
563 rmpp_active = 0;
564 }
565
566 base_version = ((struct ib_mad_hdr *)&packet->mad.data)->base_version;
567 data_len = count - hdr_size(file) - hdr_len;
568 packet->msg = ib_create_send_mad(agent,
569 be32_to_cpu(packet->mad.hdr.qpn),
570 packet->mad.hdr.pkey_index, rmpp_active,
571 hdr_len, data_len, GFP_KERNEL,
572 base_version);
573 if (IS_ERR(packet->msg)) {
574 ret = PTR_ERR(packet->msg);
575 goto err_ah;
576 }
577
578 packet->msg->ah = ah;
579 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
580 packet->msg->retries = packet->mad.hdr.retries;
581 packet->msg->context[0] = packet;
582
583 /* Copy MAD header. Any RMPP header is already in place. */
584 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
585
586 if (!rmpp_active) {
587 if (copy_from_user(packet->msg->mad + copy_offset,
588 buf + copy_offset,
589 hdr_len + data_len - copy_offset)) {
590 ret = -EFAULT;
591 goto err_msg;
592 }
593 } else {
594 ret = copy_rmpp_mad(packet->msg, buf);
595 if (ret)
596 goto err_msg;
597 }
598
599 /*
600 * Set the high-order part of the transaction ID to make MADs from
601 * different agents unique, and allow routing responses back to the
602 * original requestor.
603 */
604 if (!ib_response_mad(packet->msg->mad)) {
605 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
606 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
607 (be64_to_cpup(tid) & 0xffffffff));
608 rmpp_mad->mad_hdr.tid = *tid;
609 }
610
611 if (!ib_mad_kernel_rmpp_agent(agent)
612 && ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
613 && (ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE)) {
614 spin_lock_irq(&file->send_lock);
615 list_add_tail(&packet->list, &file->send_list);
616 spin_unlock_irq(&file->send_lock);
617 } else {
618 spin_lock_irq(&file->send_lock);
619 ret = is_duplicate(file, packet);
620 if (!ret)
621 list_add_tail(&packet->list, &file->send_list);
622 spin_unlock_irq(&file->send_lock);
623 if (ret) {
624 ret = -EINVAL;
625 goto err_msg;
626 }
627 }
628
629 ret = ib_post_send_mad(packet->msg, NULL);
630 if (ret)
631 goto err_send;
632
633 mutex_unlock(&file->mutex);
634 return count;
635
636 err_send:
637 dequeue_send(file, packet);
638 err_msg:
639 ib_free_send_mad(packet->msg);
640 err_ah:
641 rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);
642 err_up:
643 mutex_unlock(&file->mutex);
644 err:
645 kfree(packet);
646 return ret;
647 }
648
649 static __poll_t ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
650 {
651 struct ib_umad_file *file = filp->private_data;
652
653 /* we will always be able to post a MAD send */
654 __poll_t mask = EPOLLOUT | EPOLLWRNORM;
655
656 poll_wait(filp, &file->recv_wait, wait);
657
658 if (!list_empty(&file->recv_list))
659 mask |= EPOLLIN | EPOLLRDNORM;
660
661 return mask;
662 }
663
664 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
665 int compat_method_mask)
666 {
667 struct ib_user_mad_reg_req ureq;
668 struct ib_mad_reg_req req;
669 struct ib_mad_agent *agent = NULL;
670 int agent_id;
671 int ret;
672
673 mutex_lock(&file->port->file_mutex);
674 mutex_lock(&file->mutex);
675
676 if (!file->port->ib_dev) {
677 dev_notice(&file->port->dev,
678 "ib_umad_reg_agent: invalid device\n");
679 ret = -EPIPE;
680 goto out;
681 }
682
683 if (copy_from_user(&ureq, arg, sizeof ureq)) {
684 ret = -EFAULT;
685 goto out;
686 }
687
688 if (ureq.qpn != 0 && ureq.qpn != 1) {
689 dev_notice(&file->port->dev,
690 "ib_umad_reg_agent: invalid QPN %d specified\n",
691 ureq.qpn);
692 ret = -EINVAL;
693 goto out;
694 }
695
696 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
697 if (!__get_agent(file, agent_id))
698 goto found;
699
700 dev_notice(&file->port->dev,
701 "ib_umad_reg_agent: Max Agents (%u) reached\n",
702 IB_UMAD_MAX_AGENTS);
703 ret = -ENOMEM;
704 goto out;
705
706 found:
707 if (ureq.mgmt_class) {
708 memset(&req, 0, sizeof(req));
709 req.mgmt_class = ureq.mgmt_class;
710 req.mgmt_class_version = ureq.mgmt_class_version;
711 memcpy(req.oui, ureq.oui, sizeof req.oui);
712
713 if (compat_method_mask) {
714 u32 *umm = (u32 *) ureq.method_mask;
715 int i;
716
717 for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
718 req.method_mask[i] =
719 umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
720 } else
721 memcpy(req.method_mask, ureq.method_mask,
722 sizeof req.method_mask);
723 }
724
725 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
726 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
727 ureq.mgmt_class ? &req : NULL,
728 ureq.rmpp_version,
729 send_handler, recv_handler, file, 0);
730 if (IS_ERR(agent)) {
731 ret = PTR_ERR(agent);
732 agent = NULL;
733 goto out;
734 }
735
736 if (put_user(agent_id,
737 (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
738 ret = -EFAULT;
739 goto out;
740 }
741
742 if (!file->already_used) {
743 file->already_used = 1;
744 if (!file->use_pkey_index) {
745 dev_warn(&file->port->dev,
746 "process %s did not enable P_Key index support.\n",
747 current->comm);
748 dev_warn(&file->port->dev,
749 " Documentation/infiniband/user_mad.rst has info on the new ABI.\n");
750 }
751 }
752
753 file->agent[agent_id] = agent;
754 ret = 0;
755
756 out:
757 mutex_unlock(&file->mutex);
758
759 if (ret && agent)
760 ib_unregister_mad_agent(agent);
761
762 mutex_unlock(&file->port->file_mutex);
763
764 return ret;
765 }
766
767 static int ib_umad_reg_agent2(struct ib_umad_file *file, void __user *arg)
768 {
769 struct ib_user_mad_reg_req2 ureq;
770 struct ib_mad_reg_req req;
771 struct ib_mad_agent *agent = NULL;
772 int agent_id;
773 int ret;
774
775 mutex_lock(&file->port->file_mutex);
776 mutex_lock(&file->mutex);
777
778 if (!file->port->ib_dev) {
779 dev_notice(&file->port->dev,
780 "ib_umad_reg_agent2: invalid device\n");
781 ret = -EPIPE;
782 goto out;
783 }
784
785 if (copy_from_user(&ureq, arg, sizeof(ureq))) {
786 ret = -EFAULT;
787 goto out;
788 }
789
790 if (ureq.qpn != 0 && ureq.qpn != 1) {
791 dev_notice(&file->port->dev,
792 "ib_umad_reg_agent2: invalid QPN %d specified\n",
793 ureq.qpn);
794 ret = -EINVAL;
795 goto out;
796 }
797
798 if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) {
799 dev_notice(&file->port->dev,
800 "ib_umad_reg_agent2 failed: invalid registration flags specified 0x%x; supported 0x%x\n",
801 ureq.flags, IB_USER_MAD_REG_FLAGS_CAP);
802 ret = -EINVAL;
803
804 if (put_user((u32)IB_USER_MAD_REG_FLAGS_CAP,
805 (u32 __user *) (arg + offsetof(struct
806 ib_user_mad_reg_req2, flags))))
807 ret = -EFAULT;
808
809 goto out;
810 }
811
812 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
813 if (!__get_agent(file, agent_id))
814 goto found;
815
816 dev_notice(&file->port->dev,
817 "ib_umad_reg_agent2: Max Agents (%u) reached\n",
818 IB_UMAD_MAX_AGENTS);
819 ret = -ENOMEM;
820 goto out;
821
822 found:
823 if (ureq.mgmt_class) {
824 memset(&req, 0, sizeof(req));
825 req.mgmt_class = ureq.mgmt_class;
826 req.mgmt_class_version = ureq.mgmt_class_version;
827 if (ureq.oui & 0xff000000) {
828 dev_notice(&file->port->dev,
829 "ib_umad_reg_agent2 failed: oui invalid 0x%08x\n",
830 ureq.oui);
831 ret = -EINVAL;
832 goto out;
833 }
834 req.oui[2] = ureq.oui & 0x0000ff;
835 req.oui[1] = (ureq.oui & 0x00ff00) >> 8;
836 req.oui[0] = (ureq.oui & 0xff0000) >> 16;
837 memcpy(req.method_mask, ureq.method_mask,
838 sizeof(req.method_mask));
839 }
840
841 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
842 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
843 ureq.mgmt_class ? &req : NULL,
844 ureq.rmpp_version,
845 send_handler, recv_handler, file,
846 ureq.flags);
847 if (IS_ERR(agent)) {
848 ret = PTR_ERR(agent);
849 agent = NULL;
850 goto out;
851 }
852
853 if (put_user(agent_id,
854 (u32 __user *)(arg +
855 offsetof(struct ib_user_mad_reg_req2, id)))) {
856 ret = -EFAULT;
857 goto out;
858 }
859
860 if (!file->already_used) {
861 file->already_used = 1;
862 file->use_pkey_index = 1;
863 }
864
865 file->agent[agent_id] = agent;
866 ret = 0;
867
868 out:
869 mutex_unlock(&file->mutex);
870
871 if (ret && agent)
872 ib_unregister_mad_agent(agent);
873
874 mutex_unlock(&file->port->file_mutex);
875
876 return ret;
877 }
878
879
880 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
881 {
882 struct ib_mad_agent *agent = NULL;
883 u32 id;
884 int ret = 0;
885
886 if (get_user(id, arg))
887 return -EFAULT;
888 if (id >= IB_UMAD_MAX_AGENTS)
889 return -EINVAL;
890
891 mutex_lock(&file->port->file_mutex);
892 mutex_lock(&file->mutex);
893
894 id = array_index_nospec(id, IB_UMAD_MAX_AGENTS);
895 if (!__get_agent(file, id)) {
896 ret = -EINVAL;
897 goto out;
898 }
899
900 agent = file->agent[id];
901 file->agent[id] = NULL;
902
903 out:
904 mutex_unlock(&file->mutex);
905
906 if (agent)
907 ib_unregister_mad_agent(agent);
908
909 mutex_unlock(&file->port->file_mutex);
910
911 return ret;
912 }
913
914 static long ib_umad_enable_pkey(struct ib_umad_file *file)
915 {
916 int ret = 0;
917
918 mutex_lock(&file->mutex);
919 if (file->already_used)
920 ret = -EINVAL;
921 else
922 file->use_pkey_index = 1;
923 mutex_unlock(&file->mutex);
924
925 return ret;
926 }
927
928 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
929 unsigned long arg)
930 {
931 switch (cmd) {
932 case IB_USER_MAD_REGISTER_AGENT:
933 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
934 case IB_USER_MAD_UNREGISTER_AGENT:
935 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
936 case IB_USER_MAD_ENABLE_PKEY:
937 return ib_umad_enable_pkey(filp->private_data);
938 case IB_USER_MAD_REGISTER_AGENT2:
939 return ib_umad_reg_agent2(filp->private_data, (void __user *) arg);
940 default:
941 return -ENOIOCTLCMD;
942 }
943 }
944
945 #ifdef CONFIG_COMPAT
946 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
947 unsigned long arg)
948 {
949 switch (cmd) {
950 case IB_USER_MAD_REGISTER_AGENT:
951 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
952 case IB_USER_MAD_UNREGISTER_AGENT:
953 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
954 case IB_USER_MAD_ENABLE_PKEY:
955 return ib_umad_enable_pkey(filp->private_data);
956 case IB_USER_MAD_REGISTER_AGENT2:
957 return ib_umad_reg_agent2(filp->private_data, compat_ptr(arg));
958 default:
959 return -ENOIOCTLCMD;
960 }
961 }
962 #endif
963
964 /*
965 * ib_umad_open() does not need the BKL:
966 *
967 * - the ib_umad_port structures are properly reference counted, and
968 * everything else is purely local to the file being created, so
969 * races against other open calls are not a problem;
970 * - the ioctl method does not affect any global state outside of the
971 * file structure being operated on;
972 */
973 static int ib_umad_open(struct inode *inode, struct file *filp)
974 {
975 struct ib_umad_port *port;
976 struct ib_umad_file *file;
977 int ret = 0;
978
979 port = container_of(inode->i_cdev, struct ib_umad_port, cdev);
980
981 mutex_lock(&port->file_mutex);
982
983 if (!port->ib_dev) {
984 ret = -ENXIO;
985 goto out;
986 }
987
988 if (!rdma_dev_access_netns(port->ib_dev, current->nsproxy->net_ns)) {
989 ret = -EPERM;
990 goto out;
991 }
992
993 file = kzalloc(sizeof(*file), GFP_KERNEL);
994 if (!file) {
995 ret = -ENOMEM;
996 goto out;
997 }
998
999 mutex_init(&file->mutex);
1000 spin_lock_init(&file->send_lock);
1001 INIT_LIST_HEAD(&file->recv_list);
1002 INIT_LIST_HEAD(&file->send_list);
1003 init_waitqueue_head(&file->recv_wait);
1004
1005 file->port = port;
1006 filp->private_data = file;
1007
1008 list_add_tail(&file->port_list, &port->file_list);
1009
1010 stream_open(inode, filp);
1011 out:
1012 mutex_unlock(&port->file_mutex);
1013 return ret;
1014 }
1015
1016 static int ib_umad_close(struct inode *inode, struct file *filp)
1017 {
1018 struct ib_umad_file *file = filp->private_data;
1019 struct ib_umad_packet *packet, *tmp;
1020 int already_dead;
1021 int i;
1022
1023 mutex_lock(&file->port->file_mutex);
1024 mutex_lock(&file->mutex);
1025
1026 already_dead = file->agents_dead;
1027 file->agents_dead = 1;
1028
1029 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
1030 if (packet->recv_wc)
1031 ib_free_recv_mad(packet->recv_wc);
1032 kfree(packet);
1033 }
1034
1035 list_del(&file->port_list);
1036
1037 mutex_unlock(&file->mutex);
1038
1039 if (!already_dead)
1040 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
1041 if (file->agent[i])
1042 ib_unregister_mad_agent(file->agent[i]);
1043
1044 mutex_unlock(&file->port->file_mutex);
1045 mutex_destroy(&file->mutex);
1046 kfree(file);
1047 return 0;
1048 }
1049
1050 static const struct file_operations umad_fops = {
1051 .owner = THIS_MODULE,
1052 .read = ib_umad_read,
1053 .write = ib_umad_write,
1054 .poll = ib_umad_poll,
1055 .unlocked_ioctl = ib_umad_ioctl,
1056 #ifdef CONFIG_COMPAT
1057 .compat_ioctl = ib_umad_compat_ioctl,
1058 #endif
1059 .open = ib_umad_open,
1060 .release = ib_umad_close,
1061 .llseek = no_llseek,
1062 };
1063
1064 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
1065 {
1066 struct ib_umad_port *port;
1067 struct ib_port_modify props = {
1068 .set_port_cap_mask = IB_PORT_SM
1069 };
1070 int ret;
1071
1072 port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev);
1073
1074 if (filp->f_flags & O_NONBLOCK) {
1075 if (down_trylock(&port->sm_sem)) {
1076 ret = -EAGAIN;
1077 goto fail;
1078 }
1079 } else {
1080 if (down_interruptible(&port->sm_sem)) {
1081 ret = -ERESTARTSYS;
1082 goto fail;
1083 }
1084 }
1085
1086 if (!rdma_dev_access_netns(port->ib_dev, current->nsproxy->net_ns)) {
1087 ret = -EPERM;
1088 goto err_up_sem;
1089 }
1090
1091 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1092 if (ret)
1093 goto err_up_sem;
1094
1095 filp->private_data = port;
1096
1097 nonseekable_open(inode, filp);
1098 return 0;
1099
1100 err_up_sem:
1101 up(&port->sm_sem);
1102
1103 fail:
1104 return ret;
1105 }
1106
1107 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
1108 {
1109 struct ib_umad_port *port = filp->private_data;
1110 struct ib_port_modify props = {
1111 .clr_port_cap_mask = IB_PORT_SM
1112 };
1113 int ret = 0;
1114
1115 mutex_lock(&port->file_mutex);
1116 if (port->ib_dev)
1117 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1118 mutex_unlock(&port->file_mutex);
1119
1120 up(&port->sm_sem);
1121
1122 return ret;
1123 }
1124
1125 static const struct file_operations umad_sm_fops = {
1126 .owner = THIS_MODULE,
1127 .open = ib_umad_sm_open,
1128 .release = ib_umad_sm_close,
1129 .llseek = no_llseek,
1130 };
1131
1132 static struct ib_umad_port *get_port(struct ib_device *ibdev,
1133 struct ib_umad_device *umad_dev,
1134 unsigned int port)
1135 {
1136 if (!umad_dev)
1137 return ERR_PTR(-EOPNOTSUPP);
1138 if (!rdma_is_port_valid(ibdev, port))
1139 return ERR_PTR(-EINVAL);
1140 if (!rdma_cap_ib_mad(ibdev, port))
1141 return ERR_PTR(-EOPNOTSUPP);
1142
1143 return &umad_dev->ports[port - rdma_start_port(ibdev)];
1144 }
1145
1146 static int ib_umad_get_nl_info(struct ib_device *ibdev, void *client_data,
1147 struct ib_client_nl_info *res)
1148 {
1149 struct ib_umad_port *port = get_port(ibdev, client_data, res->port);
1150
1151 if (IS_ERR(port))
1152 return PTR_ERR(port);
1153
1154 res->abi = IB_USER_MAD_ABI_VERSION;
1155 res->cdev = &port->dev;
1156 return 0;
1157 }
1158
1159 static struct ib_client umad_client = {
1160 .name = "umad",
1161 .add = ib_umad_add_one,
1162 .remove = ib_umad_remove_one,
1163 .get_nl_info = ib_umad_get_nl_info,
1164 };
1165 MODULE_ALIAS_RDMA_CLIENT("umad");
1166
1167 static int ib_issm_get_nl_info(struct ib_device *ibdev, void *client_data,
1168 struct ib_client_nl_info *res)
1169 {
1170 struct ib_umad_port *port = get_port(ibdev, client_data, res->port);
1171
1172 if (IS_ERR(port))
1173 return PTR_ERR(port);
1174
1175 res->abi = IB_USER_MAD_ABI_VERSION;
1176 res->cdev = &port->sm_dev;
1177 return 0;
1178 }
1179
1180 static struct ib_client issm_client = {
1181 .name = "issm",
1182 .get_nl_info = ib_issm_get_nl_info,
1183 };
1184 MODULE_ALIAS_RDMA_CLIENT("issm");
1185
1186 static ssize_t ibdev_show(struct device *dev, struct device_attribute *attr,
1187 char *buf)
1188 {
1189 struct ib_umad_port *port = dev_get_drvdata(dev);
1190
1191 if (!port)
1192 return -ENODEV;
1193
1194 return sysfs_emit(buf, "%s\n", dev_name(&port->ib_dev->dev));
1195 }
1196 static DEVICE_ATTR_RO(ibdev);
1197
1198 static ssize_t port_show(struct device *dev, struct device_attribute *attr,
1199 char *buf)
1200 {
1201 struct ib_umad_port *port = dev_get_drvdata(dev);
1202
1203 if (!port)
1204 return -ENODEV;
1205
1206 return sysfs_emit(buf, "%d\n", port->port_num);
1207 }
1208 static DEVICE_ATTR_RO(port);
1209
1210 static struct attribute *umad_class_dev_attrs[] = {
1211 &dev_attr_ibdev.attr,
1212 &dev_attr_port.attr,
1213 NULL,
1214 };
1215 ATTRIBUTE_GROUPS(umad_class_dev);
1216
1217 static char *umad_devnode(struct device *dev, umode_t *mode)
1218 {
1219 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1220 }
1221
1222 static ssize_t abi_version_show(struct class *class,
1223 struct class_attribute *attr, char *buf)
1224 {
1225 return sysfs_emit(buf, "%d\n", IB_USER_MAD_ABI_VERSION);
1226 }
1227 static CLASS_ATTR_RO(abi_version);
1228
1229 static struct attribute *umad_class_attrs[] = {
1230 &class_attr_abi_version.attr,
1231 NULL,
1232 };
1233 ATTRIBUTE_GROUPS(umad_class);
1234
1235 static struct class umad_class = {
1236 .name = "infiniband_mad",
1237 .devnode = umad_devnode,
1238 .class_groups = umad_class_groups,
1239 .dev_groups = umad_class_dev_groups,
1240 };
1241
1242 static void ib_umad_release_port(struct device *device)
1243 {
1244 struct ib_umad_port *port = dev_get_drvdata(device);
1245 struct ib_umad_device *umad_dev = port->umad_dev;
1246
1247 ib_umad_dev_put(umad_dev);
1248 }
1249
1250 static void ib_umad_init_port_dev(struct device *dev,
1251 struct ib_umad_port *port,
1252 const struct ib_device *device)
1253 {
1254 device_initialize(dev);
1255 ib_umad_dev_get(port->umad_dev);
1256 dev->class = &umad_class;
1257 dev->parent = device->dev.parent;
1258 dev_set_drvdata(dev, port);
1259 dev->release = ib_umad_release_port;
1260 }
1261
1262 static int ib_umad_init_port(struct ib_device *device, int port_num,
1263 struct ib_umad_device *umad_dev,
1264 struct ib_umad_port *port)
1265 {
1266 int devnum;
1267 dev_t base_umad;
1268 dev_t base_issm;
1269 int ret;
1270
1271 devnum = ida_alloc_max(&umad_ida, IB_UMAD_MAX_PORTS - 1, GFP_KERNEL);
1272 if (devnum < 0)
1273 return -1;
1274 port->dev_num = devnum;
1275 if (devnum >= IB_UMAD_NUM_FIXED_MINOR) {
1276 base_umad = dynamic_umad_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;
1277 base_issm = dynamic_issm_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;
1278 } else {
1279 base_umad = devnum + base_umad_dev;
1280 base_issm = devnum + base_issm_dev;
1281 }
1282
1283 port->ib_dev = device;
1284 port->umad_dev = umad_dev;
1285 port->port_num = port_num;
1286 sema_init(&port->sm_sem, 1);
1287 mutex_init(&port->file_mutex);
1288 INIT_LIST_HEAD(&port->file_list);
1289
1290 ib_umad_init_port_dev(&port->dev, port, device);
1291 port->dev.devt = base_umad;
1292 dev_set_name(&port->dev, "umad%d", port->dev_num);
1293 cdev_init(&port->cdev, &umad_fops);
1294 port->cdev.owner = THIS_MODULE;
1295
1296 ret = cdev_device_add(&port->cdev, &port->dev);
1297 if (ret)
1298 goto err_cdev;
1299
1300 ib_umad_init_port_dev(&port->sm_dev, port, device);
1301 port->sm_dev.devt = base_issm;
1302 dev_set_name(&port->sm_dev, "issm%d", port->dev_num);
1303 cdev_init(&port->sm_cdev, &umad_sm_fops);
1304 port->sm_cdev.owner = THIS_MODULE;
1305
1306 ret = cdev_device_add(&port->sm_cdev, &port->sm_dev);
1307 if (ret)
1308 goto err_dev;
1309
1310 return 0;
1311
1312 err_dev:
1313 put_device(&port->sm_dev);
1314 cdev_device_del(&port->cdev, &port->dev);
1315 err_cdev:
1316 put_device(&port->dev);
1317 ida_free(&umad_ida, devnum);
1318 return ret;
1319 }
1320
1321 static void ib_umad_kill_port(struct ib_umad_port *port)
1322 {
1323 struct ib_umad_file *file;
1324 int id;
1325
1326 cdev_device_del(&port->sm_cdev, &port->sm_dev);
1327 cdev_device_del(&port->cdev, &port->dev);
1328
1329 mutex_lock(&port->file_mutex);
1330
1331 /* Mark ib_dev NULL and block ioctl or other file ops to progress
1332 * further.
1333 */
1334 port->ib_dev = NULL;
1335
1336 list_for_each_entry(file, &port->file_list, port_list) {
1337 mutex_lock(&file->mutex);
1338 file->agents_dead = 1;
1339 mutex_unlock(&file->mutex);
1340
1341 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1342 if (file->agent[id])
1343 ib_unregister_mad_agent(file->agent[id]);
1344 }
1345
1346 mutex_unlock(&port->file_mutex);
1347
1348 ida_free(&umad_ida, port->dev_num);
1349
1350 /* balances device_initialize() */
1351 put_device(&port->sm_dev);
1352 put_device(&port->dev);
1353 }
1354
1355 static int ib_umad_add_one(struct ib_device *device)
1356 {
1357 struct ib_umad_device *umad_dev;
1358 int s, e, i;
1359 int count = 0;
1360 int ret;
1361
1362 s = rdma_start_port(device);
1363 e = rdma_end_port(device);
1364
1365 umad_dev = kzalloc(struct_size(umad_dev, ports, e - s + 1), GFP_KERNEL);
1366 if (!umad_dev)
1367 return -ENOMEM;
1368
1369 kref_init(&umad_dev->kref);
1370 for (i = s; i <= e; ++i) {
1371 if (!rdma_cap_ib_mad(device, i))
1372 continue;
1373
1374 ret = ib_umad_init_port(device, i, umad_dev,
1375 &umad_dev->ports[i - s]);
1376 if (ret)
1377 goto err;
1378
1379 count++;
1380 }
1381
1382 if (!count) {
1383 ret = -EOPNOTSUPP;
1384 goto free;
1385 }
1386
1387 ib_set_client_data(device, &umad_client, umad_dev);
1388
1389 return 0;
1390
1391 err:
1392 while (--i >= s) {
1393 if (!rdma_cap_ib_mad(device, i))
1394 continue;
1395
1396 ib_umad_kill_port(&umad_dev->ports[i - s]);
1397 }
1398 free:
1399 /* balances kref_init */
1400 ib_umad_dev_put(umad_dev);
1401 return ret;
1402 }
1403
1404 static void ib_umad_remove_one(struct ib_device *device, void *client_data)
1405 {
1406 struct ib_umad_device *umad_dev = client_data;
1407 unsigned int i;
1408
1409 rdma_for_each_port (device, i) {
1410 if (rdma_cap_ib_mad(device, i))
1411 ib_umad_kill_port(
1412 &umad_dev->ports[i - rdma_start_port(device)]);
1413 }
1414 /* balances kref_init() */
1415 ib_umad_dev_put(umad_dev);
1416 }
1417
1418 static int __init ib_umad_init(void)
1419 {
1420 int ret;
1421
1422 ret = register_chrdev_region(base_umad_dev,
1423 IB_UMAD_NUM_FIXED_MINOR * 2,
1424 umad_class.name);
1425 if (ret) {
1426 pr_err("couldn't register device number\n");
1427 goto out;
1428 }
1429
1430 ret = alloc_chrdev_region(&dynamic_umad_dev, 0,
1431 IB_UMAD_NUM_DYNAMIC_MINOR * 2,
1432 umad_class.name);
1433 if (ret) {
1434 pr_err("couldn't register dynamic device number\n");
1435 goto out_alloc;
1436 }
1437 dynamic_issm_dev = dynamic_umad_dev + IB_UMAD_NUM_DYNAMIC_MINOR;
1438
1439 ret = class_register(&umad_class);
1440 if (ret) {
1441 pr_err("couldn't create class infiniband_mad\n");
1442 goto out_chrdev;
1443 }
1444
1445 ret = ib_register_client(&umad_client);
1446 if (ret)
1447 goto out_class;
1448
1449 ret = ib_register_client(&issm_client);
1450 if (ret)
1451 goto out_client;
1452
1453 return 0;
1454
1455 out_client:
1456 ib_unregister_client(&umad_client);
1457 out_class:
1458 class_unregister(&umad_class);
1459
1460 out_chrdev:
1461 unregister_chrdev_region(dynamic_umad_dev,
1462 IB_UMAD_NUM_DYNAMIC_MINOR * 2);
1463
1464 out_alloc:
1465 unregister_chrdev_region(base_umad_dev,
1466 IB_UMAD_NUM_FIXED_MINOR * 2);
1467
1468 out:
1469 return ret;
1470 }
1471
1472 static void __exit ib_umad_cleanup(void)
1473 {
1474 ib_unregister_client(&issm_client);
1475 ib_unregister_client(&umad_client);
1476 class_unregister(&umad_class);
1477 unregister_chrdev_region(base_umad_dev,
1478 IB_UMAD_NUM_FIXED_MINOR * 2);
1479 unregister_chrdev_region(dynamic_umad_dev,
1480 IB_UMAD_NUM_DYNAMIC_MINOR * 2);
1481 }
1482
1483 module_init(ib_umad_init);
1484 module_exit(ib_umad_cleanup);
Linux with added FPC-III support