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 u32 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
ib_umad_dev_free(struct kref * kref)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
ib_umad_dev_get(struct ib_umad_device * dev)156 static void ib_umad_dev_get(struct ib_umad_device *dev)
157 {
158 kref_get(&dev->kref);
159 }
160
ib_umad_dev_put(struct ib_umad_device * dev)161 static void ib_umad_dev_put(struct ib_umad_device *dev)
162 {
163 kref_put(&dev->kref, ib_umad_dev_free);
164 }
165
hdr_size(struct ib_umad_file * file)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 */
__get_agent(struct ib_umad_file * file,int id)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
queue_packet(struct ib_umad_file * file,struct ib_mad_agent * agent,struct ib_umad_packet * packet)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
dequeue_send(struct ib_umad_file * file,struct ib_umad_packet * packet)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
send_handler(struct ib_mad_agent * agent,struct ib_mad_send_wc * send_wc)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
recv_handler(struct ib_mad_agent * agent,struct ib_mad_send_buf * send_buf,struct ib_mad_recv_wc * mad_recv_wc)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
copy_recv_mad(struct ib_umad_file * file,char __user * buf,struct ib_umad_packet * packet,size_t count)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
copy_send_mad(struct ib_umad_file * file,char __user * buf,struct ib_umad_packet * packet,size_t count)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
ib_umad_read(struct file * filp,char __user * buf,size_t count,loff_t * pos)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 if (file->agents_dead) {
383 mutex_unlock(&file->mutex);
384 return -EIO;
385 }
386
387 while (list_empty(&file->recv_list)) {
388 mutex_unlock(&file->mutex);
389
390 if (filp->f_flags & O_NONBLOCK)
391 return -EAGAIN;
392
393 if (wait_event_interruptible(file->recv_wait,
394 !list_empty(&file->recv_list)))
395 return -ERESTARTSYS;
396
397 mutex_lock(&file->mutex);
398 }
399
400 if (file->agents_dead) {
401 mutex_unlock(&file->mutex);
402 return -EIO;
403 }
404
405 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
406 list_del(&packet->list);
407
408 mutex_unlock(&file->mutex);
409
410 if (packet->recv_wc)
411 ret = copy_recv_mad(file, buf, packet, count);
412 else
413 ret = copy_send_mad(file, buf, packet, count);
414
415 if (ret < 0) {
416 /* Requeue packet */
417 mutex_lock(&file->mutex);
418 list_add(&packet->list, &file->recv_list);
419 mutex_unlock(&file->mutex);
420 } else {
421 if (packet->recv_wc)
422 ib_free_recv_mad(packet->recv_wc);
423 kfree(packet);
424 }
425 return ret;
426 }
427
copy_rmpp_mad(struct ib_mad_send_buf * msg,const char __user * buf)428 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
429 {
430 int left, seg;
431
432 /* Copy class specific header */
433 if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
434 copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
435 msg->hdr_len - IB_MGMT_RMPP_HDR))
436 return -EFAULT;
437
438 /* All headers are in place. Copy data segments. */
439 for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
440 seg++, left -= msg->seg_size, buf += msg->seg_size) {
441 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
442 min(left, msg->seg_size)))
443 return -EFAULT;
444 }
445 return 0;
446 }
447
same_destination(struct ib_user_mad_hdr * hdr1,struct ib_user_mad_hdr * hdr2)448 static int same_destination(struct ib_user_mad_hdr *hdr1,
449 struct ib_user_mad_hdr *hdr2)
450 {
451 if (!hdr1->grh_present && !hdr2->grh_present)
452 return (hdr1->lid == hdr2->lid);
453
454 if (hdr1->grh_present && hdr2->grh_present)
455 return !memcmp(hdr1->gid, hdr2->gid, 16);
456
457 return 0;
458 }
459
is_duplicate(struct ib_umad_file * file,struct ib_umad_packet * packet)460 static int is_duplicate(struct ib_umad_file *file,
461 struct ib_umad_packet *packet)
462 {
463 struct ib_umad_packet *sent_packet;
464 struct ib_mad_hdr *sent_hdr, *hdr;
465
466 hdr = (struct ib_mad_hdr *) packet->mad.data;
467 list_for_each_entry(sent_packet, &file->send_list, list) {
468 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
469
470 if ((hdr->tid != sent_hdr->tid) ||
471 (hdr->mgmt_class != sent_hdr->mgmt_class))
472 continue;
473
474 /*
475 * No need to be overly clever here. If two new operations have
476 * the same TID, reject the second as a duplicate. This is more
477 * restrictive than required by the spec.
478 */
479 if (!ib_response_mad(hdr)) {
480 if (!ib_response_mad(sent_hdr))
481 return 1;
482 continue;
483 } else if (!ib_response_mad(sent_hdr))
484 continue;
485
486 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
487 return 1;
488 }
489
490 return 0;
491 }
492
ib_umad_write(struct file * filp,const char __user * buf,size_t count,loff_t * pos)493 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
494 size_t count, loff_t *pos)
495 {
496 struct ib_umad_file *file = filp->private_data;
497 struct ib_umad_packet *packet;
498 struct ib_mad_agent *agent;
499 struct rdma_ah_attr ah_attr;
500 struct ib_ah *ah;
501 struct ib_rmpp_mad *rmpp_mad;
502 __be64 *tid;
503 int ret, data_len, hdr_len, copy_offset, rmpp_active;
504 u8 base_version;
505
506 if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
507 return -EINVAL;
508
509 packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL);
510 if (!packet)
511 return -ENOMEM;
512
513 if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
514 ret = -EFAULT;
515 goto err;
516 }
517
518 if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
519 ret = -EINVAL;
520 goto err;
521 }
522
523 buf += hdr_size(file);
524
525 if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
526 ret = -EFAULT;
527 goto err;
528 }
529
530 mutex_lock(&file->mutex);
531
532 trace_ib_umad_write(file, &packet->mad.hdr,
533 (struct ib_mad_hdr *)&packet->mad.data);
534
535 agent = __get_agent(file, packet->mad.hdr.id);
536 if (!agent) {
537 ret = -EIO;
538 goto err_up;
539 }
540
541 memset(&ah_attr, 0, sizeof ah_attr);
542 ah_attr.type = rdma_ah_find_type(agent->device,
543 file->port->port_num);
544 rdma_ah_set_dlid(&ah_attr, be16_to_cpu(packet->mad.hdr.lid));
545 rdma_ah_set_sl(&ah_attr, packet->mad.hdr.sl);
546 rdma_ah_set_path_bits(&ah_attr, packet->mad.hdr.path_bits);
547 rdma_ah_set_port_num(&ah_attr, file->port->port_num);
548 if (packet->mad.hdr.grh_present) {
549 rdma_ah_set_grh(&ah_attr, NULL,
550 be32_to_cpu(packet->mad.hdr.flow_label),
551 packet->mad.hdr.gid_index,
552 packet->mad.hdr.hop_limit,
553 packet->mad.hdr.traffic_class);
554 rdma_ah_set_dgid_raw(&ah_attr, packet->mad.hdr.gid);
555 }
556
557 ah = rdma_create_user_ah(agent->qp->pd, &ah_attr, NULL);
558 if (IS_ERR(ah)) {
559 ret = PTR_ERR(ah);
560 goto err_up;
561 }
562
563 rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data;
564 hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
565
566 if (ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
567 && ib_mad_kernel_rmpp_agent(agent)) {
568 copy_offset = IB_MGMT_RMPP_HDR;
569 rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
570 IB_MGMT_RMPP_FLAG_ACTIVE;
571 } else {
572 copy_offset = IB_MGMT_MAD_HDR;
573 rmpp_active = 0;
574 }
575
576 base_version = ((struct ib_mad_hdr *)&packet->mad.data)->base_version;
577 data_len = count - hdr_size(file) - hdr_len;
578 packet->msg = ib_create_send_mad(agent,
579 be32_to_cpu(packet->mad.hdr.qpn),
580 packet->mad.hdr.pkey_index, rmpp_active,
581 hdr_len, data_len, GFP_KERNEL,
582 base_version);
583 if (IS_ERR(packet->msg)) {
584 ret = PTR_ERR(packet->msg);
585 goto err_ah;
586 }
587
588 packet->msg->ah = ah;
589 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
590 packet->msg->retries = packet->mad.hdr.retries;
591 packet->msg->context[0] = packet;
592
593 /* Copy MAD header. Any RMPP header is already in place. */
594 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
595
596 if (!rmpp_active) {
597 if (copy_from_user(packet->msg->mad + copy_offset,
598 buf + copy_offset,
599 hdr_len + data_len - copy_offset)) {
600 ret = -EFAULT;
601 goto err_msg;
602 }
603 } else {
604 ret = copy_rmpp_mad(packet->msg, buf);
605 if (ret)
606 goto err_msg;
607 }
608
609 /*
610 * Set the high-order part of the transaction ID to make MADs from
611 * different agents unique, and allow routing responses back to the
612 * original requestor.
613 */
614 if (!ib_response_mad(packet->msg->mad)) {
615 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
616 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
617 (be64_to_cpup(tid) & 0xffffffff));
618 rmpp_mad->mad_hdr.tid = *tid;
619 }
620
621 if (!ib_mad_kernel_rmpp_agent(agent)
622 && ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)
623 && (ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE)) {
624 spin_lock_irq(&file->send_lock);
625 list_add_tail(&packet->list, &file->send_list);
626 spin_unlock_irq(&file->send_lock);
627 } else {
628 spin_lock_irq(&file->send_lock);
629 ret = is_duplicate(file, packet);
630 if (!ret)
631 list_add_tail(&packet->list, &file->send_list);
632 spin_unlock_irq(&file->send_lock);
633 if (ret) {
634 ret = -EINVAL;
635 goto err_msg;
636 }
637 }
638
639 ret = ib_post_send_mad(packet->msg, NULL);
640 if (ret)
641 goto err_send;
642
643 mutex_unlock(&file->mutex);
644 return count;
645
646 err_send:
647 dequeue_send(file, packet);
648 err_msg:
649 ib_free_send_mad(packet->msg);
650 err_ah:
651 rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);
652 err_up:
653 mutex_unlock(&file->mutex);
654 err:
655 kfree(packet);
656 return ret;
657 }
658
ib_umad_poll(struct file * filp,struct poll_table_struct * wait)659 static __poll_t ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
660 {
661 struct ib_umad_file *file = filp->private_data;
662
663 /* we will always be able to post a MAD send */
664 __poll_t mask = EPOLLOUT | EPOLLWRNORM;
665
666 mutex_lock(&file->mutex);
667 poll_wait(filp, &file->recv_wait, wait);
668
669 if (!list_empty(&file->recv_list))
670 mask |= EPOLLIN | EPOLLRDNORM;
671 if (file->agents_dead)
672 mask = EPOLLERR;
673 mutex_unlock(&file->mutex);
674
675 return mask;
676 }
677
ib_umad_reg_agent(struct ib_umad_file * file,void __user * arg,int compat_method_mask)678 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
679 int compat_method_mask)
680 {
681 struct ib_user_mad_reg_req ureq;
682 struct ib_mad_reg_req req;
683 struct ib_mad_agent *agent = NULL;
684 int agent_id;
685 int ret;
686
687 mutex_lock(&file->port->file_mutex);
688 mutex_lock(&file->mutex);
689
690 if (!file->port->ib_dev) {
691 dev_notice(&file->port->dev, "%s: invalid device\n", __func__);
692 ret = -EPIPE;
693 goto out;
694 }
695
696 if (copy_from_user(&ureq, arg, sizeof ureq)) {
697 ret = -EFAULT;
698 goto out;
699 }
700
701 if (ureq.qpn != 0 && ureq.qpn != 1) {
702 dev_notice(&file->port->dev,
703 "%s: invalid QPN %u specified\n", __func__,
704 ureq.qpn);
705 ret = -EINVAL;
706 goto out;
707 }
708
709 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
710 if (!__get_agent(file, agent_id))
711 goto found;
712
713 dev_notice(&file->port->dev, "%s: Max Agents (%u) reached\n", __func__,
714 IB_UMAD_MAX_AGENTS);
715
716 ret = -ENOMEM;
717 goto out;
718
719 found:
720 if (ureq.mgmt_class) {
721 memset(&req, 0, sizeof(req));
722 req.mgmt_class = ureq.mgmt_class;
723 req.mgmt_class_version = ureq.mgmt_class_version;
724 memcpy(req.oui, ureq.oui, sizeof req.oui);
725
726 if (compat_method_mask) {
727 u32 *umm = (u32 *) ureq.method_mask;
728 int i;
729
730 for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
731 req.method_mask[i] =
732 umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
733 } else
734 memcpy(req.method_mask, ureq.method_mask,
735 sizeof req.method_mask);
736 }
737
738 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
739 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
740 ureq.mgmt_class ? &req : NULL,
741 ureq.rmpp_version,
742 send_handler, recv_handler, file, 0);
743 if (IS_ERR(agent)) {
744 ret = PTR_ERR(agent);
745 agent = NULL;
746 goto out;
747 }
748
749 if (put_user(agent_id,
750 (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
751 ret = -EFAULT;
752 goto out;
753 }
754
755 if (!file->already_used) {
756 file->already_used = 1;
757 if (!file->use_pkey_index) {
758 dev_warn(&file->port->dev,
759 "process %s did not enable P_Key index support.\n",
760 current->comm);
761 dev_warn(&file->port->dev,
762 " Documentation/infiniband/user_mad.rst has info on the new ABI.\n");
763 }
764 }
765
766 file->agent[agent_id] = agent;
767 ret = 0;
768
769 out:
770 mutex_unlock(&file->mutex);
771
772 if (ret && agent)
773 ib_unregister_mad_agent(agent);
774
775 mutex_unlock(&file->port->file_mutex);
776
777 return ret;
778 }
779
ib_umad_reg_agent2(struct ib_umad_file * file,void __user * arg)780 static int ib_umad_reg_agent2(struct ib_umad_file *file, void __user *arg)
781 {
782 struct ib_user_mad_reg_req2 ureq;
783 struct ib_mad_reg_req req;
784 struct ib_mad_agent *agent = NULL;
785 int agent_id;
786 int ret;
787
788 mutex_lock(&file->port->file_mutex);
789 mutex_lock(&file->mutex);
790
791 if (!file->port->ib_dev) {
792 dev_notice(&file->port->dev, "%s: invalid device\n", __func__);
793 ret = -EPIPE;
794 goto out;
795 }
796
797 if (copy_from_user(&ureq, arg, sizeof(ureq))) {
798 ret = -EFAULT;
799 goto out;
800 }
801
802 if (ureq.qpn != 0 && ureq.qpn != 1) {
803 dev_notice(&file->port->dev, "%s: invalid QPN %u specified\n",
804 __func__, ureq.qpn);
805 ret = -EINVAL;
806 goto out;
807 }
808
809 if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) {
810 dev_notice(&file->port->dev,
811 "%s failed: invalid registration flags specified 0x%x; supported 0x%x\n",
812 __func__, ureq.flags, IB_USER_MAD_REG_FLAGS_CAP);
813 ret = -EINVAL;
814
815 if (put_user((u32)IB_USER_MAD_REG_FLAGS_CAP,
816 (u32 __user *) (arg + offsetof(struct
817 ib_user_mad_reg_req2, flags))))
818 ret = -EFAULT;
819
820 goto out;
821 }
822
823 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
824 if (!__get_agent(file, agent_id))
825 goto found;
826
827 dev_notice(&file->port->dev, "%s: Max Agents (%u) reached\n", __func__,
828 IB_UMAD_MAX_AGENTS);
829 ret = -ENOMEM;
830 goto out;
831
832 found:
833 if (ureq.mgmt_class) {
834 memset(&req, 0, sizeof(req));
835 req.mgmt_class = ureq.mgmt_class;
836 req.mgmt_class_version = ureq.mgmt_class_version;
837 if (ureq.oui & 0xff000000) {
838 dev_notice(&file->port->dev,
839 "%s failed: oui invalid 0x%08x\n", __func__,
840 ureq.oui);
841 ret = -EINVAL;
842 goto out;
843 }
844 req.oui[2] = ureq.oui & 0x0000ff;
845 req.oui[1] = (ureq.oui & 0x00ff00) >> 8;
846 req.oui[0] = (ureq.oui & 0xff0000) >> 16;
847 memcpy(req.method_mask, ureq.method_mask,
848 sizeof(req.method_mask));
849 }
850
851 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
852 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
853 ureq.mgmt_class ? &req : NULL,
854 ureq.rmpp_version,
855 send_handler, recv_handler, file,
856 ureq.flags);
857 if (IS_ERR(agent)) {
858 ret = PTR_ERR(agent);
859 agent = NULL;
860 goto out;
861 }
862
863 if (put_user(agent_id,
864 (u32 __user *)(arg +
865 offsetof(struct ib_user_mad_reg_req2, id)))) {
866 ret = -EFAULT;
867 goto out;
868 }
869
870 if (!file->already_used) {
871 file->already_used = 1;
872 file->use_pkey_index = 1;
873 }
874
875 file->agent[agent_id] = agent;
876 ret = 0;
877
878 out:
879 mutex_unlock(&file->mutex);
880
881 if (ret && agent)
882 ib_unregister_mad_agent(agent);
883
884 mutex_unlock(&file->port->file_mutex);
885
886 return ret;
887 }
888
889
ib_umad_unreg_agent(struct ib_umad_file * file,u32 __user * arg)890 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
891 {
892 struct ib_mad_agent *agent = NULL;
893 u32 id;
894 int ret = 0;
895
896 if (get_user(id, arg))
897 return -EFAULT;
898 if (id >= IB_UMAD_MAX_AGENTS)
899 return -EINVAL;
900
901 mutex_lock(&file->port->file_mutex);
902 mutex_lock(&file->mutex);
903
904 id = array_index_nospec(id, IB_UMAD_MAX_AGENTS);
905 if (!__get_agent(file, id)) {
906 ret = -EINVAL;
907 goto out;
908 }
909
910 agent = file->agent[id];
911 file->agent[id] = NULL;
912
913 out:
914 mutex_unlock(&file->mutex);
915
916 if (agent)
917 ib_unregister_mad_agent(agent);
918
919 mutex_unlock(&file->port->file_mutex);
920
921 return ret;
922 }
923
ib_umad_enable_pkey(struct ib_umad_file * file)924 static long ib_umad_enable_pkey(struct ib_umad_file *file)
925 {
926 int ret = 0;
927
928 mutex_lock(&file->mutex);
929 if (file->already_used)
930 ret = -EINVAL;
931 else
932 file->use_pkey_index = 1;
933 mutex_unlock(&file->mutex);
934
935 return ret;
936 }
937
ib_umad_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)938 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
939 unsigned long arg)
940 {
941 switch (cmd) {
942 case IB_USER_MAD_REGISTER_AGENT:
943 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
944 case IB_USER_MAD_UNREGISTER_AGENT:
945 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
946 case IB_USER_MAD_ENABLE_PKEY:
947 return ib_umad_enable_pkey(filp->private_data);
948 case IB_USER_MAD_REGISTER_AGENT2:
949 return ib_umad_reg_agent2(filp->private_data, (void __user *) arg);
950 default:
951 return -ENOIOCTLCMD;
952 }
953 }
954
955 #ifdef CONFIG_COMPAT
ib_umad_compat_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)956 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
957 unsigned long arg)
958 {
959 switch (cmd) {
960 case IB_USER_MAD_REGISTER_AGENT:
961 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
962 case IB_USER_MAD_UNREGISTER_AGENT:
963 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
964 case IB_USER_MAD_ENABLE_PKEY:
965 return ib_umad_enable_pkey(filp->private_data);
966 case IB_USER_MAD_REGISTER_AGENT2:
967 return ib_umad_reg_agent2(filp->private_data, compat_ptr(arg));
968 default:
969 return -ENOIOCTLCMD;
970 }
971 }
972 #endif
973
974 /*
975 * ib_umad_open() does not need the BKL:
976 *
977 * - the ib_umad_port structures are properly reference counted, and
978 * everything else is purely local to the file being created, so
979 * races against other open calls are not a problem;
980 * - the ioctl method does not affect any global state outside of the
981 * file structure being operated on;
982 */
ib_umad_open(struct inode * inode,struct file * filp)983 static int ib_umad_open(struct inode *inode, struct file *filp)
984 {
985 struct ib_umad_port *port;
986 struct ib_umad_file *file;
987 int ret = 0;
988
989 port = container_of(inode->i_cdev, struct ib_umad_port, cdev);
990
991 mutex_lock(&port->file_mutex);
992
993 if (!port->ib_dev) {
994 ret = -ENXIO;
995 goto out;
996 }
997
998 if (!rdma_dev_access_netns(port->ib_dev, current->nsproxy->net_ns)) {
999 ret = -EPERM;
1000 goto out;
1001 }
1002
1003 file = kzalloc(sizeof(*file), GFP_KERNEL);
1004 if (!file) {
1005 ret = -ENOMEM;
1006 goto out;
1007 }
1008
1009 mutex_init(&file->mutex);
1010 spin_lock_init(&file->send_lock);
1011 INIT_LIST_HEAD(&file->recv_list);
1012 INIT_LIST_HEAD(&file->send_list);
1013 init_waitqueue_head(&file->recv_wait);
1014
1015 file->port = port;
1016 filp->private_data = file;
1017
1018 list_add_tail(&file->port_list, &port->file_list);
1019
1020 stream_open(inode, filp);
1021 out:
1022 mutex_unlock(&port->file_mutex);
1023 return ret;
1024 }
1025
ib_umad_close(struct inode * inode,struct file * filp)1026 static int ib_umad_close(struct inode *inode, struct file *filp)
1027 {
1028 struct ib_umad_file *file = filp->private_data;
1029 struct ib_umad_packet *packet, *tmp;
1030 int already_dead;
1031 int i;
1032
1033 mutex_lock(&file->port->file_mutex);
1034 mutex_lock(&file->mutex);
1035
1036 already_dead = file->agents_dead;
1037 file->agents_dead = 1;
1038
1039 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
1040 if (packet->recv_wc)
1041 ib_free_recv_mad(packet->recv_wc);
1042 kfree(packet);
1043 }
1044
1045 list_del(&file->port_list);
1046
1047 mutex_unlock(&file->mutex);
1048
1049 if (!already_dead)
1050 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
1051 if (file->agent[i])
1052 ib_unregister_mad_agent(file->agent[i]);
1053
1054 mutex_unlock(&file->port->file_mutex);
1055 mutex_destroy(&file->mutex);
1056 kfree(file);
1057 return 0;
1058 }
1059
1060 static const struct file_operations umad_fops = {
1061 .owner = THIS_MODULE,
1062 .read = ib_umad_read,
1063 .write = ib_umad_write,
1064 .poll = ib_umad_poll,
1065 .unlocked_ioctl = ib_umad_ioctl,
1066 #ifdef CONFIG_COMPAT
1067 .compat_ioctl = ib_umad_compat_ioctl,
1068 #endif
1069 .open = ib_umad_open,
1070 .release = ib_umad_close,
1071 .llseek = no_llseek,
1072 };
1073
ib_umad_sm_open(struct inode * inode,struct file * filp)1074 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
1075 {
1076 struct ib_umad_port *port;
1077 struct ib_port_modify props = {
1078 .set_port_cap_mask = IB_PORT_SM
1079 };
1080 int ret;
1081
1082 port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev);
1083
1084 if (filp->f_flags & O_NONBLOCK) {
1085 if (down_trylock(&port->sm_sem)) {
1086 ret = -EAGAIN;
1087 goto fail;
1088 }
1089 } else {
1090 if (down_interruptible(&port->sm_sem)) {
1091 ret = -ERESTARTSYS;
1092 goto fail;
1093 }
1094 }
1095
1096 if (!rdma_dev_access_netns(port->ib_dev, current->nsproxy->net_ns)) {
1097 ret = -EPERM;
1098 goto err_up_sem;
1099 }
1100
1101 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1102 if (ret)
1103 goto err_up_sem;
1104
1105 filp->private_data = port;
1106
1107 nonseekable_open(inode, filp);
1108 return 0;
1109
1110 err_up_sem:
1111 up(&port->sm_sem);
1112
1113 fail:
1114 return ret;
1115 }
1116
ib_umad_sm_close(struct inode * inode,struct file * filp)1117 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
1118 {
1119 struct ib_umad_port *port = filp->private_data;
1120 struct ib_port_modify props = {
1121 .clr_port_cap_mask = IB_PORT_SM
1122 };
1123 int ret = 0;
1124
1125 mutex_lock(&port->file_mutex);
1126 if (port->ib_dev)
1127 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1128 mutex_unlock(&port->file_mutex);
1129
1130 up(&port->sm_sem);
1131
1132 return ret;
1133 }
1134
1135 static const struct file_operations umad_sm_fops = {
1136 .owner = THIS_MODULE,
1137 .open = ib_umad_sm_open,
1138 .release = ib_umad_sm_close,
1139 .llseek = no_llseek,
1140 };
1141
get_port(struct ib_device * ibdev,struct ib_umad_device * umad_dev,u32 port)1142 static struct ib_umad_port *get_port(struct ib_device *ibdev,
1143 struct ib_umad_device *umad_dev,
1144 u32 port)
1145 {
1146 if (!umad_dev)
1147 return ERR_PTR(-EOPNOTSUPP);
1148 if (!rdma_is_port_valid(ibdev, port))
1149 return ERR_PTR(-EINVAL);
1150 if (!rdma_cap_ib_mad(ibdev, port))
1151 return ERR_PTR(-EOPNOTSUPP);
1152
1153 return &umad_dev->ports[port - rdma_start_port(ibdev)];
1154 }
1155
ib_umad_get_nl_info(struct ib_device * ibdev,void * client_data,struct ib_client_nl_info * res)1156 static int ib_umad_get_nl_info(struct ib_device *ibdev, void *client_data,
1157 struct ib_client_nl_info *res)
1158 {
1159 struct ib_umad_port *port = get_port(ibdev, client_data, res->port);
1160
1161 if (IS_ERR(port))
1162 return PTR_ERR(port);
1163
1164 res->abi = IB_USER_MAD_ABI_VERSION;
1165 res->cdev = &port->dev;
1166 return 0;
1167 }
1168
1169 static struct ib_client umad_client = {
1170 .name = "umad",
1171 .add = ib_umad_add_one,
1172 .remove = ib_umad_remove_one,
1173 .get_nl_info = ib_umad_get_nl_info,
1174 };
1175 MODULE_ALIAS_RDMA_CLIENT("umad");
1176
ib_issm_get_nl_info(struct ib_device * ibdev,void * client_data,struct ib_client_nl_info * res)1177 static int ib_issm_get_nl_info(struct ib_device *ibdev, void *client_data,
1178 struct ib_client_nl_info *res)
1179 {
1180 struct ib_umad_port *port = get_port(ibdev, client_data, res->port);
1181
1182 if (IS_ERR(port))
1183 return PTR_ERR(port);
1184
1185 res->abi = IB_USER_MAD_ABI_VERSION;
1186 res->cdev = &port->sm_dev;
1187 return 0;
1188 }
1189
1190 static struct ib_client issm_client = {
1191 .name = "issm",
1192 .get_nl_info = ib_issm_get_nl_info,
1193 };
1194 MODULE_ALIAS_RDMA_CLIENT("issm");
1195
ibdev_show(struct device * dev,struct device_attribute * attr,char * buf)1196 static ssize_t ibdev_show(struct device *dev, struct device_attribute *attr,
1197 char *buf)
1198 {
1199 struct ib_umad_port *port = dev_get_drvdata(dev);
1200
1201 if (!port)
1202 return -ENODEV;
1203
1204 return sysfs_emit(buf, "%s\n", dev_name(&port->ib_dev->dev));
1205 }
1206 static DEVICE_ATTR_RO(ibdev);
1207
port_show(struct device * dev,struct device_attribute * attr,char * buf)1208 static ssize_t port_show(struct device *dev, struct device_attribute *attr,
1209 char *buf)
1210 {
1211 struct ib_umad_port *port = dev_get_drvdata(dev);
1212
1213 if (!port)
1214 return -ENODEV;
1215
1216 return sysfs_emit(buf, "%d\n", port->port_num);
1217 }
1218 static DEVICE_ATTR_RO(port);
1219
1220 static struct attribute *umad_class_dev_attrs[] = {
1221 &dev_attr_ibdev.attr,
1222 &dev_attr_port.attr,
1223 NULL,
1224 };
1225 ATTRIBUTE_GROUPS(umad_class_dev);
1226
umad_devnode(struct device * dev,umode_t * mode)1227 static char *umad_devnode(struct device *dev, umode_t *mode)
1228 {
1229 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1230 }
1231
abi_version_show(struct class * class,struct class_attribute * attr,char * buf)1232 static ssize_t abi_version_show(struct class *class,
1233 struct class_attribute *attr, char *buf)
1234 {
1235 return sysfs_emit(buf, "%d\n", IB_USER_MAD_ABI_VERSION);
1236 }
1237 static CLASS_ATTR_RO(abi_version);
1238
1239 static struct attribute *umad_class_attrs[] = {
1240 &class_attr_abi_version.attr,
1241 NULL,
1242 };
1243 ATTRIBUTE_GROUPS(umad_class);
1244
1245 static struct class umad_class = {
1246 .name = "infiniband_mad",
1247 .devnode = umad_devnode,
1248 .class_groups = umad_class_groups,
1249 .dev_groups = umad_class_dev_groups,
1250 };
1251
ib_umad_release_port(struct device * device)1252 static void ib_umad_release_port(struct device *device)
1253 {
1254 struct ib_umad_port *port = dev_get_drvdata(device);
1255 struct ib_umad_device *umad_dev = port->umad_dev;
1256
1257 ib_umad_dev_put(umad_dev);
1258 }
1259
ib_umad_init_port_dev(struct device * dev,struct ib_umad_port * port,const struct ib_device * device)1260 static void ib_umad_init_port_dev(struct device *dev,
1261 struct ib_umad_port *port,
1262 const struct ib_device *device)
1263 {
1264 device_initialize(dev);
1265 ib_umad_dev_get(port->umad_dev);
1266 dev->class = &umad_class;
1267 dev->parent = device->dev.parent;
1268 dev_set_drvdata(dev, port);
1269 dev->release = ib_umad_release_port;
1270 }
1271
ib_umad_init_port(struct ib_device * device,int port_num,struct ib_umad_device * umad_dev,struct ib_umad_port * port)1272 static int ib_umad_init_port(struct ib_device *device, int port_num,
1273 struct ib_umad_device *umad_dev,
1274 struct ib_umad_port *port)
1275 {
1276 int devnum;
1277 dev_t base_umad;
1278 dev_t base_issm;
1279 int ret;
1280
1281 devnum = ida_alloc_max(&umad_ida, IB_UMAD_MAX_PORTS - 1, GFP_KERNEL);
1282 if (devnum < 0)
1283 return -1;
1284 port->dev_num = devnum;
1285 if (devnum >= IB_UMAD_NUM_FIXED_MINOR) {
1286 base_umad = dynamic_umad_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;
1287 base_issm = dynamic_issm_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;
1288 } else {
1289 base_umad = devnum + base_umad_dev;
1290 base_issm = devnum + base_issm_dev;
1291 }
1292
1293 port->ib_dev = device;
1294 port->umad_dev = umad_dev;
1295 port->port_num = port_num;
1296 sema_init(&port->sm_sem, 1);
1297 mutex_init(&port->file_mutex);
1298 INIT_LIST_HEAD(&port->file_list);
1299
1300 ib_umad_init_port_dev(&port->dev, port, device);
1301 port->dev.devt = base_umad;
1302 dev_set_name(&port->dev, "umad%d", port->dev_num);
1303 cdev_init(&port->cdev, &umad_fops);
1304 port->cdev.owner = THIS_MODULE;
1305
1306 ret = cdev_device_add(&port->cdev, &port->dev);
1307 if (ret)
1308 goto err_cdev;
1309
1310 ib_umad_init_port_dev(&port->sm_dev, port, device);
1311 port->sm_dev.devt = base_issm;
1312 dev_set_name(&port->sm_dev, "issm%d", port->dev_num);
1313 cdev_init(&port->sm_cdev, &umad_sm_fops);
1314 port->sm_cdev.owner = THIS_MODULE;
1315
1316 ret = cdev_device_add(&port->sm_cdev, &port->sm_dev);
1317 if (ret)
1318 goto err_dev;
1319
1320 return 0;
1321
1322 err_dev:
1323 put_device(&port->sm_dev);
1324 cdev_device_del(&port->cdev, &port->dev);
1325 err_cdev:
1326 put_device(&port->dev);
1327 ida_free(&umad_ida, devnum);
1328 return ret;
1329 }
1330
ib_umad_kill_port(struct ib_umad_port * port)1331 static void ib_umad_kill_port(struct ib_umad_port *port)
1332 {
1333 struct ib_umad_file *file;
1334 int id;
1335
1336 cdev_device_del(&port->sm_cdev, &port->sm_dev);
1337 cdev_device_del(&port->cdev, &port->dev);
1338
1339 mutex_lock(&port->file_mutex);
1340
1341 /* Mark ib_dev NULL and block ioctl or other file ops to progress
1342 * further.
1343 */
1344 port->ib_dev = NULL;
1345
1346 list_for_each_entry(file, &port->file_list, port_list) {
1347 mutex_lock(&file->mutex);
1348 file->agents_dead = 1;
1349 wake_up_interruptible(&file->recv_wait);
1350 mutex_unlock(&file->mutex);
1351
1352 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1353 if (file->agent[id])
1354 ib_unregister_mad_agent(file->agent[id]);
1355 }
1356
1357 mutex_unlock(&port->file_mutex);
1358
1359 ida_free(&umad_ida, port->dev_num);
1360
1361 /* balances device_initialize() */
1362 put_device(&port->sm_dev);
1363 put_device(&port->dev);
1364 }
1365
ib_umad_add_one(struct ib_device * device)1366 static int ib_umad_add_one(struct ib_device *device)
1367 {
1368 struct ib_umad_device *umad_dev;
1369 int s, e, i;
1370 int count = 0;
1371 int ret;
1372
1373 s = rdma_start_port(device);
1374 e = rdma_end_port(device);
1375
1376 umad_dev = kzalloc(struct_size(umad_dev, ports, e - s + 1), GFP_KERNEL);
1377 if (!umad_dev)
1378 return -ENOMEM;
1379
1380 kref_init(&umad_dev->kref);
1381 for (i = s; i <= e; ++i) {
1382 if (!rdma_cap_ib_mad(device, i))
1383 continue;
1384
1385 ret = ib_umad_init_port(device, i, umad_dev,
1386 &umad_dev->ports[i - s]);
1387 if (ret)
1388 goto err;
1389
1390 count++;
1391 }
1392
1393 if (!count) {
1394 ret = -EOPNOTSUPP;
1395 goto free;
1396 }
1397
1398 ib_set_client_data(device, &umad_client, umad_dev);
1399
1400 return 0;
1401
1402 err:
1403 while (--i >= s) {
1404 if (!rdma_cap_ib_mad(device, i))
1405 continue;
1406
1407 ib_umad_kill_port(&umad_dev->ports[i - s]);
1408 }
1409 free:
1410 /* balances kref_init */
1411 ib_umad_dev_put(umad_dev);
1412 return ret;
1413 }
1414
ib_umad_remove_one(struct ib_device * device,void * client_data)1415 static void ib_umad_remove_one(struct ib_device *device, void *client_data)
1416 {
1417 struct ib_umad_device *umad_dev = client_data;
1418 unsigned int i;
1419
1420 rdma_for_each_port (device, i) {
1421 if (rdma_cap_ib_mad(device, i))
1422 ib_umad_kill_port(
1423 &umad_dev->ports[i - rdma_start_port(device)]);
1424 }
1425 /* balances kref_init() */
1426 ib_umad_dev_put(umad_dev);
1427 }
1428
ib_umad_init(void)1429 static int __init ib_umad_init(void)
1430 {
1431 int ret;
1432
1433 ret = register_chrdev_region(base_umad_dev,
1434 IB_UMAD_NUM_FIXED_MINOR * 2,
1435 umad_class.name);
1436 if (ret) {
1437 pr_err("couldn't register device number\n");
1438 goto out;
1439 }
1440
1441 ret = alloc_chrdev_region(&dynamic_umad_dev, 0,
1442 IB_UMAD_NUM_DYNAMIC_MINOR * 2,
1443 umad_class.name);
1444 if (ret) {
1445 pr_err("couldn't register dynamic device number\n");
1446 goto out_alloc;
1447 }
1448 dynamic_issm_dev = dynamic_umad_dev + IB_UMAD_NUM_DYNAMIC_MINOR;
1449
1450 ret = class_register(&umad_class);
1451 if (ret) {
1452 pr_err("couldn't create class infiniband_mad\n");
1453 goto out_chrdev;
1454 }
1455
1456 ret = ib_register_client(&umad_client);
1457 if (ret)
1458 goto out_class;
1459
1460 ret = ib_register_client(&issm_client);
1461 if (ret)
1462 goto out_client;
1463
1464 return 0;
1465
1466 out_client:
1467 ib_unregister_client(&umad_client);
1468 out_class:
1469 class_unregister(&umad_class);
1470
1471 out_chrdev:
1472 unregister_chrdev_region(dynamic_umad_dev,
1473 IB_UMAD_NUM_DYNAMIC_MINOR * 2);
1474
1475 out_alloc:
1476 unregister_chrdev_region(base_umad_dev,
1477 IB_UMAD_NUM_FIXED_MINOR * 2);
1478
1479 out:
1480 return ret;
1481 }
1482
ib_umad_cleanup(void)1483 static void __exit ib_umad_cleanup(void)
1484 {
1485 ib_unregister_client(&issm_client);
1486 ib_unregister_client(&umad_client);
1487 class_unregister(&umad_class);
1488 unregister_chrdev_region(base_umad_dev,
1489 IB_UMAD_NUM_FIXED_MINOR * 2);
1490 unregister_chrdev_region(dynamic_umad_dev,
1491 IB_UMAD_NUM_DYNAMIC_MINOR * 2);
1492 }
1493
1494 module_init(ib_umad_init);
1495 module_exit(ib_umad_cleanup);
1496