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 #define MAX_UMAD_RECV_LIST_SIZE 200000
67
68 enum {
69 IB_UMAD_MAX_PORTS = RDMA_MAX_PORTS,
70 IB_UMAD_MAX_AGENTS = 32,
71
72 IB_UMAD_MAJOR = 231,
73 IB_UMAD_MINOR_BASE = 0,
74 IB_UMAD_NUM_FIXED_MINOR = 64,
75 IB_UMAD_NUM_DYNAMIC_MINOR = IB_UMAD_MAX_PORTS - IB_UMAD_NUM_FIXED_MINOR,
76 IB_ISSM_MINOR_BASE = IB_UMAD_NUM_FIXED_MINOR,
77 };
78
79 /*
80 * Our lifetime rules for these structs are the following:
81 * device special file is opened, we take a reference on the
82 * ib_umad_port's struct ib_umad_device. We drop these
83 * references in the corresponding close().
84 *
85 * In addition to references coming from open character devices, there
86 * is one more reference to each ib_umad_device representing the
87 * module's reference taken when allocating the ib_umad_device in
88 * ib_umad_add_one().
89 *
90 * When destroying an ib_umad_device, we drop the module's reference.
91 */
92
93 struct ib_umad_port {
94 struct cdev cdev;
95 struct device dev;
96 struct cdev sm_cdev;
97 struct device sm_dev;
98 struct semaphore sm_sem;
99
100 struct mutex file_mutex;
101 struct list_head file_list;
102
103 struct ib_device *ib_dev;
104 struct ib_umad_device *umad_dev;
105 int dev_num;
106 u32 port_num;
107 };
108
109 struct ib_umad_device {
110 struct kref kref;
111 struct ib_umad_port ports[];
112 };
113
114 struct ib_umad_file {
115 struct mutex mutex;
116 struct ib_umad_port *port;
117 struct list_head recv_list;
118 atomic_t recv_list_size;
119 struct list_head send_list;
120 struct list_head port_list;
121 spinlock_t send_lock;
122 wait_queue_head_t recv_wait;
123 struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS];
124 int agents_dead;
125 u8 use_pkey_index;
126 u8 already_used;
127 };
128
129 struct ib_umad_packet {
130 struct ib_mad_send_buf *msg;
131 struct ib_mad_recv_wc *recv_wc;
132 struct list_head list;
133 int length;
134 struct ib_user_mad mad;
135 };
136
137 struct ib_rmpp_mad_hdr {
138 struct ib_mad_hdr mad_hdr;
139 struct ib_rmpp_hdr rmpp_hdr;
140 } __packed;
141
142 #define CREATE_TRACE_POINTS
143 #include <trace/events/ib_umad.h>
144
145 static const dev_t base_umad_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE);
146 static const dev_t base_issm_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE) +
147 IB_UMAD_NUM_FIXED_MINOR;
148 static dev_t dynamic_umad_dev;
149 static dev_t dynamic_issm_dev;
150
151 static DEFINE_IDA(umad_ida);
152
153 static int ib_umad_add_one(struct ib_device *device);
154 static void ib_umad_remove_one(struct ib_device *device, void *client_data);
155
ib_umad_dev_free(struct kref * kref)156 static void ib_umad_dev_free(struct kref *kref)
157 {
158 struct ib_umad_device *dev =
159 container_of(kref, struct ib_umad_device, kref);
160
161 kfree(dev);
162 }
163
ib_umad_dev_get(struct ib_umad_device * dev)164 static void ib_umad_dev_get(struct ib_umad_device *dev)
165 {
166 kref_get(&dev->kref);
167 }
168
ib_umad_dev_put(struct ib_umad_device * dev)169 static void ib_umad_dev_put(struct ib_umad_device *dev)
170 {
171 kref_put(&dev->kref, ib_umad_dev_free);
172 }
173
hdr_size(struct ib_umad_file * file)174 static int hdr_size(struct ib_umad_file *file)
175 {
176 return file->use_pkey_index ? sizeof(struct ib_user_mad_hdr) :
177 sizeof(struct ib_user_mad_hdr_old);
178 }
179
180 /* caller must hold file->mutex */
__get_agent(struct ib_umad_file * file,int id)181 static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id)
182 {
183 return file->agents_dead ? NULL : file->agent[id];
184 }
185
queue_packet(struct ib_umad_file * file,struct ib_mad_agent * agent,struct ib_umad_packet * packet,bool is_recv_mad)186 static int queue_packet(struct ib_umad_file *file, struct ib_mad_agent *agent,
187 struct ib_umad_packet *packet, bool is_recv_mad)
188 {
189 int ret = 1;
190
191 mutex_lock(&file->mutex);
192
193 if (is_recv_mad &&
194 atomic_read(&file->recv_list_size) > MAX_UMAD_RECV_LIST_SIZE)
195 goto unlock;
196
197 for (packet->mad.hdr.id = 0;
198 packet->mad.hdr.id < IB_UMAD_MAX_AGENTS;
199 packet->mad.hdr.id++)
200 if (agent == __get_agent(file, packet->mad.hdr.id)) {
201 list_add_tail(&packet->list, &file->recv_list);
202 atomic_inc(&file->recv_list_size);
203 wake_up_interruptible(&file->recv_wait);
204 ret = 0;
205 break;
206 }
207 unlock:
208 mutex_unlock(&file->mutex);
209
210 return ret;
211 }
212
dequeue_send(struct ib_umad_file * file,struct ib_umad_packet * packet)213 static void dequeue_send(struct ib_umad_file *file,
214 struct ib_umad_packet *packet)
215 {
216 spin_lock_irq(&file->send_lock);
217 list_del(&packet->list);
218 spin_unlock_irq(&file->send_lock);
219 }
220
send_handler(struct ib_mad_agent * agent,struct ib_mad_send_wc * send_wc)221 static void send_handler(struct ib_mad_agent *agent,
222 struct ib_mad_send_wc *send_wc)
223 {
224 struct ib_umad_file *file = agent->context;
225 struct ib_umad_packet *packet = send_wc->send_buf->context[0];
226
227 dequeue_send(file, packet);
228 rdma_destroy_ah(packet->msg->ah, RDMA_DESTROY_AH_SLEEPABLE);
229 ib_free_send_mad(packet->msg);
230
231 if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) {
232 packet->length = IB_MGMT_MAD_HDR;
233 packet->mad.hdr.status = ETIMEDOUT;
234 if (!queue_packet(file, agent, packet, false))
235 return;
236 }
237 kfree(packet);
238 }
239
recv_handler(struct ib_mad_agent * agent,struct ib_mad_send_buf * send_buf,struct ib_mad_recv_wc * mad_recv_wc)240 static void recv_handler(struct ib_mad_agent *agent,
241 struct ib_mad_send_buf *send_buf,
242 struct ib_mad_recv_wc *mad_recv_wc)
243 {
244 struct ib_umad_file *file = agent->context;
245 struct ib_umad_packet *packet;
246
247 if (mad_recv_wc->wc->status != IB_WC_SUCCESS)
248 goto err1;
249
250 packet = kzalloc(sizeof *packet, GFP_KERNEL);
251 if (!packet)
252 goto err1;
253
254 packet->length = mad_recv_wc->mad_len;
255 packet->recv_wc = mad_recv_wc;
256
257 packet->mad.hdr.status = 0;
258 packet->mad.hdr.length = hdr_size(file) + mad_recv_wc->mad_len;
259 packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp);
260 /*
261 * On OPA devices it is okay to lose the upper 16 bits of LID as this
262 * information is obtained elsewhere. Mask off the upper 16 bits.
263 */
264 if (rdma_cap_opa_mad(agent->device, agent->port_num))
265 packet->mad.hdr.lid = ib_lid_be16(0xFFFF &
266 mad_recv_wc->wc->slid);
267 else
268 packet->mad.hdr.lid = ib_lid_be16(mad_recv_wc->wc->slid);
269 packet->mad.hdr.sl = mad_recv_wc->wc->sl;
270 packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits;
271 packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index;
272 packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH);
273 if (packet->mad.hdr.grh_present) {
274 struct rdma_ah_attr ah_attr;
275 const struct ib_global_route *grh;
276 int ret;
277
278 ret = ib_init_ah_attr_from_wc(agent->device, agent->port_num,
279 mad_recv_wc->wc,
280 mad_recv_wc->recv_buf.grh,
281 &ah_attr);
282 if (ret)
283 goto err2;
284
285 grh = rdma_ah_read_grh(&ah_attr);
286 packet->mad.hdr.gid_index = grh->sgid_index;
287 packet->mad.hdr.hop_limit = grh->hop_limit;
288 packet->mad.hdr.traffic_class = grh->traffic_class;
289 memcpy(packet->mad.hdr.gid, &grh->dgid, 16);
290 packet->mad.hdr.flow_label = cpu_to_be32(grh->flow_label);
291 rdma_destroy_ah_attr(&ah_attr);
292 }
293
294 if (queue_packet(file, agent, packet, true))
295 goto err2;
296 return;
297
298 err2:
299 kfree(packet);
300 err1:
301 ib_free_recv_mad(mad_recv_wc);
302 }
303
copy_recv_mad(struct ib_umad_file * file,char __user * buf,struct ib_umad_packet * packet,size_t count)304 static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf,
305 struct ib_umad_packet *packet, size_t count)
306 {
307 struct ib_mad_recv_buf *recv_buf;
308 int left, seg_payload, offset, max_seg_payload;
309 size_t seg_size;
310
311 recv_buf = &packet->recv_wc->recv_buf;
312 seg_size = packet->recv_wc->mad_seg_size;
313
314 /* We need enough room to copy the first (or only) MAD segment. */
315 if ((packet->length <= seg_size &&
316 count < hdr_size(file) + packet->length) ||
317 (packet->length > seg_size &&
318 count < hdr_size(file) + seg_size))
319 return -EINVAL;
320
321 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
322 return -EFAULT;
323
324 buf += hdr_size(file);
325 seg_payload = min_t(int, packet->length, seg_size);
326 if (copy_to_user(buf, recv_buf->mad, seg_payload))
327 return -EFAULT;
328
329 if (seg_payload < packet->length) {
330 /*
331 * Multipacket RMPP MAD message. Copy remainder of message.
332 * Note that last segment may have a shorter payload.
333 */
334 if (count < hdr_size(file) + packet->length) {
335 /*
336 * The buffer is too small, return the first RMPP segment,
337 * which includes the RMPP message length.
338 */
339 return -ENOSPC;
340 }
341 offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class);
342 max_seg_payload = seg_size - offset;
343
344 for (left = packet->length - seg_payload, buf += seg_payload;
345 left; left -= seg_payload, buf += seg_payload) {
346 recv_buf = container_of(recv_buf->list.next,
347 struct ib_mad_recv_buf, list);
348 seg_payload = min(left, max_seg_payload);
349 if (copy_to_user(buf, ((void *) recv_buf->mad) + offset,
350 seg_payload))
351 return -EFAULT;
352 }
353 }
354
355 trace_ib_umad_read_recv(file, &packet->mad.hdr, &recv_buf->mad->mad_hdr);
356
357 return hdr_size(file) + packet->length;
358 }
359
copy_send_mad(struct ib_umad_file * file,char __user * buf,struct ib_umad_packet * packet,size_t count)360 static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf,
361 struct ib_umad_packet *packet, size_t count)
362 {
363 ssize_t size = hdr_size(file) + packet->length;
364
365 if (count < size)
366 return -EINVAL;
367
368 if (copy_to_user(buf, &packet->mad, hdr_size(file)))
369 return -EFAULT;
370
371 buf += hdr_size(file);
372
373 if (copy_to_user(buf, packet->mad.data, packet->length))
374 return -EFAULT;
375
376 trace_ib_umad_read_send(file, &packet->mad.hdr,
377 (struct ib_mad_hdr *)&packet->mad.data);
378
379 return size;
380 }
381
ib_umad_read(struct file * filp,char __user * buf,size_t count,loff_t * pos)382 static ssize_t ib_umad_read(struct file *filp, char __user *buf,
383 size_t count, loff_t *pos)
384 {
385 struct ib_umad_file *file = filp->private_data;
386 struct ib_umad_packet *packet;
387 ssize_t ret;
388
389 if (count < hdr_size(file))
390 return -EINVAL;
391
392 mutex_lock(&file->mutex);
393
394 if (file->agents_dead) {
395 mutex_unlock(&file->mutex);
396 return -EIO;
397 }
398
399 while (list_empty(&file->recv_list)) {
400 mutex_unlock(&file->mutex);
401
402 if (filp->f_flags & O_NONBLOCK)
403 return -EAGAIN;
404
405 if (wait_event_interruptible(file->recv_wait,
406 !list_empty(&file->recv_list)))
407 return -ERESTARTSYS;
408
409 mutex_lock(&file->mutex);
410 }
411
412 if (file->agents_dead) {
413 mutex_unlock(&file->mutex);
414 return -EIO;
415 }
416
417 packet = list_entry(file->recv_list.next, struct ib_umad_packet, list);
418 list_del(&packet->list);
419 atomic_dec(&file->recv_list_size);
420
421 mutex_unlock(&file->mutex);
422
423 if (packet->recv_wc)
424 ret = copy_recv_mad(file, buf, packet, count);
425 else
426 ret = copy_send_mad(file, buf, packet, count);
427
428 if (ret < 0) {
429 /* Requeue packet */
430 mutex_lock(&file->mutex);
431 list_add(&packet->list, &file->recv_list);
432 atomic_inc(&file->recv_list_size);
433 mutex_unlock(&file->mutex);
434 } else {
435 if (packet->recv_wc)
436 ib_free_recv_mad(packet->recv_wc);
437 kfree(packet);
438 }
439 return ret;
440 }
441
copy_rmpp_mad(struct ib_mad_send_buf * msg,const char __user * buf)442 static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf)
443 {
444 int left, seg;
445
446 /* Copy class specific header */
447 if ((msg->hdr_len > IB_MGMT_RMPP_HDR) &&
448 copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR,
449 msg->hdr_len - IB_MGMT_RMPP_HDR))
450 return -EFAULT;
451
452 /* All headers are in place. Copy data segments. */
453 for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0;
454 seg++, left -= msg->seg_size, buf += msg->seg_size) {
455 if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf,
456 min(left, msg->seg_size)))
457 return -EFAULT;
458 }
459 return 0;
460 }
461
same_destination(struct ib_user_mad_hdr * hdr1,struct ib_user_mad_hdr * hdr2)462 static int same_destination(struct ib_user_mad_hdr *hdr1,
463 struct ib_user_mad_hdr *hdr2)
464 {
465 if (!hdr1->grh_present && !hdr2->grh_present)
466 return (hdr1->lid == hdr2->lid);
467
468 if (hdr1->grh_present && hdr2->grh_present)
469 return !memcmp(hdr1->gid, hdr2->gid, 16);
470
471 return 0;
472 }
473
is_duplicate(struct ib_umad_file * file,struct ib_umad_packet * packet)474 static int is_duplicate(struct ib_umad_file *file,
475 struct ib_umad_packet *packet)
476 {
477 struct ib_umad_packet *sent_packet;
478 struct ib_mad_hdr *sent_hdr, *hdr;
479
480 hdr = (struct ib_mad_hdr *) packet->mad.data;
481 list_for_each_entry(sent_packet, &file->send_list, list) {
482 sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data;
483
484 if ((hdr->tid != sent_hdr->tid) ||
485 (hdr->mgmt_class != sent_hdr->mgmt_class))
486 continue;
487
488 /*
489 * No need to be overly clever here. If two new operations have
490 * the same TID, reject the second as a duplicate. This is more
491 * restrictive than required by the spec.
492 */
493 if (!ib_response_mad(hdr)) {
494 if (!ib_response_mad(sent_hdr))
495 return 1;
496 continue;
497 } else if (!ib_response_mad(sent_hdr))
498 continue;
499
500 if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr))
501 return 1;
502 }
503
504 return 0;
505 }
506
ib_umad_write(struct file * filp,const char __user * buf,size_t count,loff_t * pos)507 static ssize_t ib_umad_write(struct file *filp, const char __user *buf,
508 size_t count, loff_t *pos)
509 {
510 struct ib_umad_file *file = filp->private_data;
511 struct ib_rmpp_mad_hdr *rmpp_mad_hdr;
512 struct ib_umad_packet *packet;
513 struct ib_mad_agent *agent;
514 struct rdma_ah_attr ah_attr;
515 struct ib_ah *ah;
516 __be64 *tid;
517 int ret, data_len, hdr_len, copy_offset, rmpp_active;
518 u8 base_version;
519
520 if (count < hdr_size(file) + IB_MGMT_RMPP_HDR)
521 return -EINVAL;
522
523 packet = kzalloc(sizeof(*packet) + IB_MGMT_RMPP_HDR, GFP_KERNEL);
524 if (!packet)
525 return -ENOMEM;
526
527 if (copy_from_user(&packet->mad, buf, hdr_size(file))) {
528 ret = -EFAULT;
529 goto err;
530 }
531
532 if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) {
533 ret = -EINVAL;
534 goto err;
535 }
536
537 buf += hdr_size(file);
538
539 if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) {
540 ret = -EFAULT;
541 goto err;
542 }
543
544 mutex_lock(&file->mutex);
545
546 trace_ib_umad_write(file, &packet->mad.hdr,
547 (struct ib_mad_hdr *)&packet->mad.data);
548
549 agent = __get_agent(file, packet->mad.hdr.id);
550 if (!agent) {
551 ret = -EIO;
552 goto err_up;
553 }
554
555 memset(&ah_attr, 0, sizeof ah_attr);
556 ah_attr.type = rdma_ah_find_type(agent->device,
557 file->port->port_num);
558 rdma_ah_set_dlid(&ah_attr, be16_to_cpu(packet->mad.hdr.lid));
559 rdma_ah_set_sl(&ah_attr, packet->mad.hdr.sl);
560 rdma_ah_set_path_bits(&ah_attr, packet->mad.hdr.path_bits);
561 rdma_ah_set_port_num(&ah_attr, file->port->port_num);
562 if (packet->mad.hdr.grh_present) {
563 rdma_ah_set_grh(&ah_attr, NULL,
564 be32_to_cpu(packet->mad.hdr.flow_label),
565 packet->mad.hdr.gid_index,
566 packet->mad.hdr.hop_limit,
567 packet->mad.hdr.traffic_class);
568 rdma_ah_set_dgid_raw(&ah_attr, packet->mad.hdr.gid);
569 }
570
571 ah = rdma_create_user_ah(agent->qp->pd, &ah_attr, NULL);
572 if (IS_ERR(ah)) {
573 ret = PTR_ERR(ah);
574 goto err_up;
575 }
576
577 rmpp_mad_hdr = (struct ib_rmpp_mad_hdr *)packet->mad.data;
578 hdr_len = ib_get_mad_data_offset(rmpp_mad_hdr->mad_hdr.mgmt_class);
579
580 if (ib_is_mad_class_rmpp(rmpp_mad_hdr->mad_hdr.mgmt_class)
581 && ib_mad_kernel_rmpp_agent(agent)) {
582 copy_offset = IB_MGMT_RMPP_HDR;
583 rmpp_active = ib_get_rmpp_flags(&rmpp_mad_hdr->rmpp_hdr) &
584 IB_MGMT_RMPP_FLAG_ACTIVE;
585 } else {
586 copy_offset = IB_MGMT_MAD_HDR;
587 rmpp_active = 0;
588 }
589
590 base_version = ((struct ib_mad_hdr *)&packet->mad.data)->base_version;
591 data_len = count - hdr_size(file) - hdr_len;
592 packet->msg = ib_create_send_mad(agent,
593 be32_to_cpu(packet->mad.hdr.qpn),
594 packet->mad.hdr.pkey_index, rmpp_active,
595 hdr_len, data_len, GFP_KERNEL,
596 base_version);
597 if (IS_ERR(packet->msg)) {
598 ret = PTR_ERR(packet->msg);
599 goto err_ah;
600 }
601
602 packet->msg->ah = ah;
603 packet->msg->timeout_ms = packet->mad.hdr.timeout_ms;
604 packet->msg->retries = packet->mad.hdr.retries;
605 packet->msg->context[0] = packet;
606
607 /* Copy MAD header. Any RMPP header is already in place. */
608 memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR);
609
610 if (!rmpp_active) {
611 if (copy_from_user(packet->msg->mad + copy_offset,
612 buf + copy_offset,
613 hdr_len + data_len - copy_offset)) {
614 ret = -EFAULT;
615 goto err_msg;
616 }
617 } else {
618 ret = copy_rmpp_mad(packet->msg, buf);
619 if (ret)
620 goto err_msg;
621 }
622
623 /*
624 * Set the high-order part of the transaction ID to make MADs from
625 * different agents unique, and allow routing responses back to the
626 * original requestor.
627 */
628 if (!ib_response_mad(packet->msg->mad)) {
629 tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid;
630 *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 |
631 (be64_to_cpup(tid) & 0xffffffff));
632 rmpp_mad_hdr->mad_hdr.tid = *tid;
633 }
634
635 if (!ib_mad_kernel_rmpp_agent(agent)
636 && ib_is_mad_class_rmpp(rmpp_mad_hdr->mad_hdr.mgmt_class)
637 && (ib_get_rmpp_flags(&rmpp_mad_hdr->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE)) {
638 spin_lock_irq(&file->send_lock);
639 list_add_tail(&packet->list, &file->send_list);
640 spin_unlock_irq(&file->send_lock);
641 } else {
642 spin_lock_irq(&file->send_lock);
643 ret = is_duplicate(file, packet);
644 if (!ret)
645 list_add_tail(&packet->list, &file->send_list);
646 spin_unlock_irq(&file->send_lock);
647 if (ret) {
648 ret = -EINVAL;
649 goto err_msg;
650 }
651 }
652
653 ret = ib_post_send_mad(packet->msg, NULL);
654 if (ret)
655 goto err_send;
656
657 mutex_unlock(&file->mutex);
658 return count;
659
660 err_send:
661 dequeue_send(file, packet);
662 err_msg:
663 ib_free_send_mad(packet->msg);
664 err_ah:
665 rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);
666 err_up:
667 mutex_unlock(&file->mutex);
668 err:
669 kfree(packet);
670 return ret;
671 }
672
ib_umad_poll(struct file * filp,struct poll_table_struct * wait)673 static __poll_t ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
674 {
675 struct ib_umad_file *file = filp->private_data;
676
677 /* we will always be able to post a MAD send */
678 __poll_t mask = EPOLLOUT | EPOLLWRNORM;
679
680 mutex_lock(&file->mutex);
681 poll_wait(filp, &file->recv_wait, wait);
682
683 if (!list_empty(&file->recv_list))
684 mask |= EPOLLIN | EPOLLRDNORM;
685 if (file->agents_dead)
686 mask = EPOLLERR;
687 mutex_unlock(&file->mutex);
688
689 return mask;
690 }
691
ib_umad_reg_agent(struct ib_umad_file * file,void __user * arg,int compat_method_mask)692 static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg,
693 int compat_method_mask)
694 {
695 struct ib_user_mad_reg_req ureq;
696 struct ib_mad_reg_req req;
697 struct ib_mad_agent *agent = NULL;
698 int agent_id;
699 int ret;
700
701 mutex_lock(&file->port->file_mutex);
702 mutex_lock(&file->mutex);
703
704 if (!file->port->ib_dev) {
705 dev_notice(&file->port->dev, "%s: invalid device\n", __func__);
706 ret = -EPIPE;
707 goto out;
708 }
709
710 if (copy_from_user(&ureq, arg, sizeof ureq)) {
711 ret = -EFAULT;
712 goto out;
713 }
714
715 if (ureq.qpn != 0 && ureq.qpn != 1) {
716 dev_notice(&file->port->dev,
717 "%s: invalid QPN %u specified\n", __func__,
718 ureq.qpn);
719 ret = -EINVAL;
720 goto out;
721 }
722
723 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
724 if (!__get_agent(file, agent_id))
725 goto found;
726
727 dev_notice(&file->port->dev, "%s: Max Agents (%u) reached\n", __func__,
728 IB_UMAD_MAX_AGENTS);
729
730 ret = -ENOMEM;
731 goto out;
732
733 found:
734 if (ureq.mgmt_class) {
735 memset(&req, 0, sizeof(req));
736 req.mgmt_class = ureq.mgmt_class;
737 req.mgmt_class_version = ureq.mgmt_class_version;
738 memcpy(req.oui, ureq.oui, sizeof req.oui);
739
740 if (compat_method_mask) {
741 u32 *umm = (u32 *) ureq.method_mask;
742 int i;
743
744 for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i)
745 req.method_mask[i] =
746 umm[i * 2] | ((u64) umm[i * 2 + 1] << 32);
747 } else
748 memcpy(req.method_mask, ureq.method_mask,
749 sizeof req.method_mask);
750 }
751
752 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
753 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
754 ureq.mgmt_class ? &req : NULL,
755 ureq.rmpp_version,
756 send_handler, recv_handler, file, 0);
757 if (IS_ERR(agent)) {
758 ret = PTR_ERR(agent);
759 agent = NULL;
760 goto out;
761 }
762
763 if (put_user(agent_id,
764 (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) {
765 ret = -EFAULT;
766 goto out;
767 }
768
769 if (!file->already_used) {
770 file->already_used = 1;
771 if (!file->use_pkey_index) {
772 dev_warn(&file->port->dev,
773 "process %s did not enable P_Key index support.\n",
774 current->comm);
775 dev_warn(&file->port->dev,
776 " Documentation/infiniband/user_mad.rst has info on the new ABI.\n");
777 }
778 }
779
780 file->agent[agent_id] = agent;
781 ret = 0;
782
783 out:
784 mutex_unlock(&file->mutex);
785
786 if (ret && agent)
787 ib_unregister_mad_agent(agent);
788
789 mutex_unlock(&file->port->file_mutex);
790
791 return ret;
792 }
793
ib_umad_reg_agent2(struct ib_umad_file * file,void __user * arg)794 static int ib_umad_reg_agent2(struct ib_umad_file *file, void __user *arg)
795 {
796 struct ib_user_mad_reg_req2 ureq;
797 struct ib_mad_reg_req req;
798 struct ib_mad_agent *agent = NULL;
799 int agent_id;
800 int ret;
801
802 mutex_lock(&file->port->file_mutex);
803 mutex_lock(&file->mutex);
804
805 if (!file->port->ib_dev) {
806 dev_notice(&file->port->dev, "%s: invalid device\n", __func__);
807 ret = -EPIPE;
808 goto out;
809 }
810
811 if (copy_from_user(&ureq, arg, sizeof(ureq))) {
812 ret = -EFAULT;
813 goto out;
814 }
815
816 if (ureq.qpn != 0 && ureq.qpn != 1) {
817 dev_notice(&file->port->dev, "%s: invalid QPN %u specified\n",
818 __func__, ureq.qpn);
819 ret = -EINVAL;
820 goto out;
821 }
822
823 if (ureq.flags & ~IB_USER_MAD_REG_FLAGS_CAP) {
824 dev_notice(&file->port->dev,
825 "%s failed: invalid registration flags specified 0x%x; supported 0x%x\n",
826 __func__, ureq.flags, IB_USER_MAD_REG_FLAGS_CAP);
827 ret = -EINVAL;
828
829 if (put_user((u32)IB_USER_MAD_REG_FLAGS_CAP,
830 (u32 __user *) (arg + offsetof(struct
831 ib_user_mad_reg_req2, flags))))
832 ret = -EFAULT;
833
834 goto out;
835 }
836
837 for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id)
838 if (!__get_agent(file, agent_id))
839 goto found;
840
841 dev_notice(&file->port->dev, "%s: Max Agents (%u) reached\n", __func__,
842 IB_UMAD_MAX_AGENTS);
843 ret = -ENOMEM;
844 goto out;
845
846 found:
847 if (ureq.mgmt_class) {
848 memset(&req, 0, sizeof(req));
849 req.mgmt_class = ureq.mgmt_class;
850 req.mgmt_class_version = ureq.mgmt_class_version;
851 if (ureq.oui & 0xff000000) {
852 dev_notice(&file->port->dev,
853 "%s failed: oui invalid 0x%08x\n", __func__,
854 ureq.oui);
855 ret = -EINVAL;
856 goto out;
857 }
858 req.oui[2] = ureq.oui & 0x0000ff;
859 req.oui[1] = (ureq.oui & 0x00ff00) >> 8;
860 req.oui[0] = (ureq.oui & 0xff0000) >> 16;
861 memcpy(req.method_mask, ureq.method_mask,
862 sizeof(req.method_mask));
863 }
864
865 agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num,
866 ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI,
867 ureq.mgmt_class ? &req : NULL,
868 ureq.rmpp_version,
869 send_handler, recv_handler, file,
870 ureq.flags);
871 if (IS_ERR(agent)) {
872 ret = PTR_ERR(agent);
873 agent = NULL;
874 goto out;
875 }
876
877 if (put_user(agent_id,
878 (u32 __user *)(arg +
879 offsetof(struct ib_user_mad_reg_req2, id)))) {
880 ret = -EFAULT;
881 goto out;
882 }
883
884 if (!file->already_used) {
885 file->already_used = 1;
886 file->use_pkey_index = 1;
887 }
888
889 file->agent[agent_id] = agent;
890 ret = 0;
891
892 out:
893 mutex_unlock(&file->mutex);
894
895 if (ret && agent)
896 ib_unregister_mad_agent(agent);
897
898 mutex_unlock(&file->port->file_mutex);
899
900 return ret;
901 }
902
903
ib_umad_unreg_agent(struct ib_umad_file * file,u32 __user * arg)904 static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
905 {
906 struct ib_mad_agent *agent = NULL;
907 u32 id;
908 int ret = 0;
909
910 if (get_user(id, arg))
911 return -EFAULT;
912 if (id >= IB_UMAD_MAX_AGENTS)
913 return -EINVAL;
914
915 mutex_lock(&file->port->file_mutex);
916 mutex_lock(&file->mutex);
917
918 id = array_index_nospec(id, IB_UMAD_MAX_AGENTS);
919 if (!__get_agent(file, id)) {
920 ret = -EINVAL;
921 goto out;
922 }
923
924 agent = file->agent[id];
925 file->agent[id] = NULL;
926
927 out:
928 mutex_unlock(&file->mutex);
929
930 if (agent)
931 ib_unregister_mad_agent(agent);
932
933 mutex_unlock(&file->port->file_mutex);
934
935 return ret;
936 }
937
ib_umad_enable_pkey(struct ib_umad_file * file)938 static long ib_umad_enable_pkey(struct ib_umad_file *file)
939 {
940 int ret = 0;
941
942 mutex_lock(&file->mutex);
943 if (file->already_used)
944 ret = -EINVAL;
945 else
946 file->use_pkey_index = 1;
947 mutex_unlock(&file->mutex);
948
949 return ret;
950 }
951
ib_umad_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)952 static long ib_umad_ioctl(struct file *filp, unsigned int cmd,
953 unsigned long arg)
954 {
955 switch (cmd) {
956 case IB_USER_MAD_REGISTER_AGENT:
957 return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0);
958 case IB_USER_MAD_UNREGISTER_AGENT:
959 return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg);
960 case IB_USER_MAD_ENABLE_PKEY:
961 return ib_umad_enable_pkey(filp->private_data);
962 case IB_USER_MAD_REGISTER_AGENT2:
963 return ib_umad_reg_agent2(filp->private_data, (void __user *) arg);
964 default:
965 return -ENOIOCTLCMD;
966 }
967 }
968
969 #ifdef CONFIG_COMPAT
ib_umad_compat_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)970 static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd,
971 unsigned long arg)
972 {
973 switch (cmd) {
974 case IB_USER_MAD_REGISTER_AGENT:
975 return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1);
976 case IB_USER_MAD_UNREGISTER_AGENT:
977 return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg));
978 case IB_USER_MAD_ENABLE_PKEY:
979 return ib_umad_enable_pkey(filp->private_data);
980 case IB_USER_MAD_REGISTER_AGENT2:
981 return ib_umad_reg_agent2(filp->private_data, compat_ptr(arg));
982 default:
983 return -ENOIOCTLCMD;
984 }
985 }
986 #endif
987
988 /*
989 * ib_umad_open() does not need the BKL:
990 *
991 * - the ib_umad_port structures are properly reference counted, and
992 * everything else is purely local to the file being created, so
993 * races against other open calls are not a problem;
994 * - the ioctl method does not affect any global state outside of the
995 * file structure being operated on;
996 */
ib_umad_open(struct inode * inode,struct file * filp)997 static int ib_umad_open(struct inode *inode, struct file *filp)
998 {
999 struct ib_umad_port *port;
1000 struct ib_umad_file *file;
1001 int ret = 0;
1002
1003 port = container_of(inode->i_cdev, struct ib_umad_port, cdev);
1004
1005 mutex_lock(&port->file_mutex);
1006
1007 if (!port->ib_dev) {
1008 ret = -ENXIO;
1009 goto out;
1010 }
1011
1012 if (!rdma_dev_access_netns(port->ib_dev, current->nsproxy->net_ns)) {
1013 ret = -EPERM;
1014 goto out;
1015 }
1016
1017 file = kzalloc(sizeof(*file), GFP_KERNEL);
1018 if (!file) {
1019 ret = -ENOMEM;
1020 goto out;
1021 }
1022
1023 mutex_init(&file->mutex);
1024 spin_lock_init(&file->send_lock);
1025 INIT_LIST_HEAD(&file->recv_list);
1026 INIT_LIST_HEAD(&file->send_list);
1027 init_waitqueue_head(&file->recv_wait);
1028
1029 file->port = port;
1030 filp->private_data = file;
1031
1032 list_add_tail(&file->port_list, &port->file_list);
1033
1034 stream_open(inode, filp);
1035 out:
1036 mutex_unlock(&port->file_mutex);
1037 return ret;
1038 }
1039
ib_umad_close(struct inode * inode,struct file * filp)1040 static int ib_umad_close(struct inode *inode, struct file *filp)
1041 {
1042 struct ib_umad_file *file = filp->private_data;
1043 struct ib_umad_packet *packet, *tmp;
1044 int already_dead;
1045 int i;
1046
1047 mutex_lock(&file->port->file_mutex);
1048 mutex_lock(&file->mutex);
1049
1050 already_dead = file->agents_dead;
1051 file->agents_dead = 1;
1052
1053 list_for_each_entry_safe(packet, tmp, &file->recv_list, list) {
1054 if (packet->recv_wc)
1055 ib_free_recv_mad(packet->recv_wc);
1056 kfree(packet);
1057 }
1058
1059 list_del(&file->port_list);
1060
1061 mutex_unlock(&file->mutex);
1062
1063 if (!already_dead)
1064 for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i)
1065 if (file->agent[i])
1066 ib_unregister_mad_agent(file->agent[i]);
1067
1068 mutex_unlock(&file->port->file_mutex);
1069 mutex_destroy(&file->mutex);
1070 kfree(file);
1071 return 0;
1072 }
1073
1074 static const struct file_operations umad_fops = {
1075 .owner = THIS_MODULE,
1076 .read = ib_umad_read,
1077 .write = ib_umad_write,
1078 .poll = ib_umad_poll,
1079 .unlocked_ioctl = ib_umad_ioctl,
1080 #ifdef CONFIG_COMPAT
1081 .compat_ioctl = ib_umad_compat_ioctl,
1082 #endif
1083 .open = ib_umad_open,
1084 .release = ib_umad_close,
1085 };
1086
ib_umad_sm_open(struct inode * inode,struct file * filp)1087 static int ib_umad_sm_open(struct inode *inode, struct file *filp)
1088 {
1089 struct ib_umad_port *port;
1090 struct ib_port_modify props = {
1091 .set_port_cap_mask = IB_PORT_SM
1092 };
1093 int ret;
1094
1095 port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev);
1096
1097 if (filp->f_flags & O_NONBLOCK) {
1098 if (down_trylock(&port->sm_sem)) {
1099 ret = -EAGAIN;
1100 goto fail;
1101 }
1102 } else {
1103 if (down_interruptible(&port->sm_sem)) {
1104 ret = -ERESTARTSYS;
1105 goto fail;
1106 }
1107 }
1108
1109 if (!rdma_dev_access_netns(port->ib_dev, current->nsproxy->net_ns)) {
1110 ret = -EPERM;
1111 goto err_up_sem;
1112 }
1113
1114 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1115 if (ret)
1116 goto err_up_sem;
1117
1118 filp->private_data = port;
1119
1120 nonseekable_open(inode, filp);
1121 return 0;
1122
1123 err_up_sem:
1124 up(&port->sm_sem);
1125
1126 fail:
1127 return ret;
1128 }
1129
ib_umad_sm_close(struct inode * inode,struct file * filp)1130 static int ib_umad_sm_close(struct inode *inode, struct file *filp)
1131 {
1132 struct ib_umad_port *port = filp->private_data;
1133 struct ib_port_modify props = {
1134 .clr_port_cap_mask = IB_PORT_SM
1135 };
1136 int ret = 0;
1137
1138 mutex_lock(&port->file_mutex);
1139 if (port->ib_dev)
1140 ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props);
1141 mutex_unlock(&port->file_mutex);
1142
1143 up(&port->sm_sem);
1144
1145 return ret;
1146 }
1147
1148 static const struct file_operations umad_sm_fops = {
1149 .owner = THIS_MODULE,
1150 .open = ib_umad_sm_open,
1151 .release = ib_umad_sm_close,
1152 };
1153
get_port(struct ib_device * ibdev,struct ib_umad_device * umad_dev,u32 port)1154 static struct ib_umad_port *get_port(struct ib_device *ibdev,
1155 struct ib_umad_device *umad_dev,
1156 u32 port)
1157 {
1158 if (!umad_dev)
1159 return ERR_PTR(-EOPNOTSUPP);
1160 if (!rdma_is_port_valid(ibdev, port))
1161 return ERR_PTR(-EINVAL);
1162 if (!rdma_cap_ib_mad(ibdev, port))
1163 return ERR_PTR(-EOPNOTSUPP);
1164
1165 return &umad_dev->ports[port - rdma_start_port(ibdev)];
1166 }
1167
ib_umad_get_nl_info(struct ib_device * ibdev,void * client_data,struct ib_client_nl_info * res)1168 static int ib_umad_get_nl_info(struct ib_device *ibdev, void *client_data,
1169 struct ib_client_nl_info *res)
1170 {
1171 struct ib_umad_port *port = get_port(ibdev, client_data, res->port);
1172
1173 if (IS_ERR(port))
1174 return PTR_ERR(port);
1175
1176 res->abi = IB_USER_MAD_ABI_VERSION;
1177 res->cdev = &port->dev;
1178 return 0;
1179 }
1180
1181 static struct ib_client umad_client = {
1182 .name = "umad",
1183 .add = ib_umad_add_one,
1184 .remove = ib_umad_remove_one,
1185 .get_nl_info = ib_umad_get_nl_info,
1186 };
1187 MODULE_ALIAS_RDMA_CLIENT("umad");
1188
ib_issm_get_nl_info(struct ib_device * ibdev,void * client_data,struct ib_client_nl_info * res)1189 static int ib_issm_get_nl_info(struct ib_device *ibdev, void *client_data,
1190 struct ib_client_nl_info *res)
1191 {
1192 struct ib_umad_port *port = get_port(ibdev, client_data, res->port);
1193
1194 if (IS_ERR(port))
1195 return PTR_ERR(port);
1196
1197 res->abi = IB_USER_MAD_ABI_VERSION;
1198 res->cdev = &port->sm_dev;
1199 return 0;
1200 }
1201
1202 static struct ib_client issm_client = {
1203 .name = "issm",
1204 .get_nl_info = ib_issm_get_nl_info,
1205 };
1206 MODULE_ALIAS_RDMA_CLIENT("issm");
1207
ibdev_show(struct device * dev,struct device_attribute * attr,char * buf)1208 static ssize_t ibdev_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, "%s\n", dev_name(&port->ib_dev->dev));
1217 }
1218 static DEVICE_ATTR_RO(ibdev);
1219
port_show(struct device * dev,struct device_attribute * attr,char * buf)1220 static ssize_t port_show(struct device *dev, struct device_attribute *attr,
1221 char *buf)
1222 {
1223 struct ib_umad_port *port = dev_get_drvdata(dev);
1224
1225 if (!port)
1226 return -ENODEV;
1227
1228 return sysfs_emit(buf, "%d\n", port->port_num);
1229 }
1230 static DEVICE_ATTR_RO(port);
1231
1232 static struct attribute *umad_class_dev_attrs[] = {
1233 &dev_attr_ibdev.attr,
1234 &dev_attr_port.attr,
1235 NULL,
1236 };
1237 ATTRIBUTE_GROUPS(umad_class_dev);
1238
umad_devnode(const struct device * dev,umode_t * mode)1239 static char *umad_devnode(const struct device *dev, umode_t *mode)
1240 {
1241 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1242 }
1243
abi_version_show(const struct class * class,const struct class_attribute * attr,char * buf)1244 static ssize_t abi_version_show(const struct class *class,
1245 const struct class_attribute *attr, char *buf)
1246 {
1247 return sysfs_emit(buf, "%d\n", IB_USER_MAD_ABI_VERSION);
1248 }
1249 static CLASS_ATTR_RO(abi_version);
1250
1251 static struct attribute *umad_class_attrs[] = {
1252 &class_attr_abi_version.attr,
1253 NULL,
1254 };
1255 ATTRIBUTE_GROUPS(umad_class);
1256
1257 static struct class umad_class = {
1258 .name = "infiniband_mad",
1259 .devnode = umad_devnode,
1260 .class_groups = umad_class_groups,
1261 .dev_groups = umad_class_dev_groups,
1262 };
1263
ib_umad_release_port(struct device * device)1264 static void ib_umad_release_port(struct device *device)
1265 {
1266 struct ib_umad_port *port = dev_get_drvdata(device);
1267 struct ib_umad_device *umad_dev = port->umad_dev;
1268
1269 ib_umad_dev_put(umad_dev);
1270 }
1271
ib_umad_init_port_dev(struct device * dev,struct ib_umad_port * port,const struct ib_device * device)1272 static void ib_umad_init_port_dev(struct device *dev,
1273 struct ib_umad_port *port,
1274 const struct ib_device *device)
1275 {
1276 device_initialize(dev);
1277 ib_umad_dev_get(port->umad_dev);
1278 dev->class = &umad_class;
1279 dev->parent = device->dev.parent;
1280 dev_set_drvdata(dev, port);
1281 dev->release = ib_umad_release_port;
1282 }
1283
ib_umad_init_port(struct ib_device * device,int port_num,struct ib_umad_device * umad_dev,struct ib_umad_port * port)1284 static int ib_umad_init_port(struct ib_device *device, int port_num,
1285 struct ib_umad_device *umad_dev,
1286 struct ib_umad_port *port)
1287 {
1288 int devnum;
1289 dev_t base_umad;
1290 dev_t base_issm;
1291 int ret;
1292
1293 devnum = ida_alloc_max(&umad_ida, IB_UMAD_MAX_PORTS - 1, GFP_KERNEL);
1294 if (devnum < 0)
1295 return -1;
1296 port->dev_num = devnum;
1297 if (devnum >= IB_UMAD_NUM_FIXED_MINOR) {
1298 base_umad = dynamic_umad_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;
1299 base_issm = dynamic_issm_dev + devnum - IB_UMAD_NUM_FIXED_MINOR;
1300 } else {
1301 base_umad = devnum + base_umad_dev;
1302 base_issm = devnum + base_issm_dev;
1303 }
1304
1305 port->ib_dev = device;
1306 port->umad_dev = umad_dev;
1307 port->port_num = port_num;
1308 sema_init(&port->sm_sem, 1);
1309 mutex_init(&port->file_mutex);
1310 INIT_LIST_HEAD(&port->file_list);
1311
1312 ib_umad_init_port_dev(&port->dev, port, device);
1313 port->dev.devt = base_umad;
1314 dev_set_name(&port->dev, "umad%d", port->dev_num);
1315 cdev_init(&port->cdev, &umad_fops);
1316 port->cdev.owner = THIS_MODULE;
1317
1318 ret = cdev_device_add(&port->cdev, &port->dev);
1319 if (ret)
1320 goto err_cdev;
1321
1322 if (rdma_cap_ib_smi(device, port_num)) {
1323 ib_umad_init_port_dev(&port->sm_dev, port, device);
1324 port->sm_dev.devt = base_issm;
1325 dev_set_name(&port->sm_dev, "issm%d", port->dev_num);
1326 cdev_init(&port->sm_cdev, &umad_sm_fops);
1327 port->sm_cdev.owner = THIS_MODULE;
1328
1329 ret = cdev_device_add(&port->sm_cdev, &port->sm_dev);
1330 if (ret)
1331 goto err_dev;
1332 }
1333
1334 return 0;
1335
1336 err_dev:
1337 put_device(&port->sm_dev);
1338 cdev_device_del(&port->cdev, &port->dev);
1339 err_cdev:
1340 put_device(&port->dev);
1341 ida_free(&umad_ida, devnum);
1342 return ret;
1343 }
1344
ib_umad_kill_port(struct ib_umad_port * port)1345 static void ib_umad_kill_port(struct ib_umad_port *port)
1346 {
1347 struct ib_umad_file *file;
1348 bool has_smi = false;
1349 int id;
1350
1351 if (rdma_cap_ib_smi(port->ib_dev, port->port_num)) {
1352 cdev_device_del(&port->sm_cdev, &port->sm_dev);
1353 has_smi = true;
1354 }
1355 cdev_device_del(&port->cdev, &port->dev);
1356
1357 mutex_lock(&port->file_mutex);
1358
1359 /* Mark ib_dev NULL and block ioctl or other file ops to progress
1360 * further.
1361 */
1362 port->ib_dev = NULL;
1363
1364 list_for_each_entry(file, &port->file_list, port_list) {
1365 mutex_lock(&file->mutex);
1366 file->agents_dead = 1;
1367 wake_up_interruptible(&file->recv_wait);
1368 mutex_unlock(&file->mutex);
1369
1370 for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id)
1371 if (file->agent[id])
1372 ib_unregister_mad_agent(file->agent[id]);
1373 }
1374
1375 mutex_unlock(&port->file_mutex);
1376
1377 ida_free(&umad_ida, port->dev_num);
1378
1379 /* balances device_initialize() */
1380 if (has_smi)
1381 put_device(&port->sm_dev);
1382 put_device(&port->dev);
1383 }
1384
ib_umad_add_one(struct ib_device * device)1385 static int ib_umad_add_one(struct ib_device *device)
1386 {
1387 struct ib_umad_device *umad_dev;
1388 int s, e, i;
1389 int count = 0;
1390 int ret;
1391
1392 s = rdma_start_port(device);
1393 e = rdma_end_port(device);
1394
1395 umad_dev = kzalloc(struct_size(umad_dev, ports,
1396 size_add(size_sub(e, s), 1)),
1397 GFP_KERNEL);
1398 if (!umad_dev)
1399 return -ENOMEM;
1400
1401 kref_init(&umad_dev->kref);
1402 for (i = s; i <= e; ++i) {
1403 if (!rdma_cap_ib_mad(device, i))
1404 continue;
1405
1406 ret = ib_umad_init_port(device, i, umad_dev,
1407 &umad_dev->ports[i - s]);
1408 if (ret)
1409 goto err;
1410
1411 count++;
1412 }
1413
1414 if (!count) {
1415 ret = -EOPNOTSUPP;
1416 goto free;
1417 }
1418
1419 ib_set_client_data(device, &umad_client, umad_dev);
1420
1421 return 0;
1422
1423 err:
1424 while (--i >= s) {
1425 if (!rdma_cap_ib_mad(device, i))
1426 continue;
1427
1428 ib_umad_kill_port(&umad_dev->ports[i - s]);
1429 }
1430 free:
1431 /* balances kref_init */
1432 ib_umad_dev_put(umad_dev);
1433 return ret;
1434 }
1435
ib_umad_remove_one(struct ib_device * device,void * client_data)1436 static void ib_umad_remove_one(struct ib_device *device, void *client_data)
1437 {
1438 struct ib_umad_device *umad_dev = client_data;
1439 unsigned int i;
1440
1441 rdma_for_each_port (device, i) {
1442 if (rdma_cap_ib_mad(device, i))
1443 ib_umad_kill_port(
1444 &umad_dev->ports[i - rdma_start_port(device)]);
1445 }
1446 /* balances kref_init() */
1447 ib_umad_dev_put(umad_dev);
1448 }
1449
ib_umad_init(void)1450 static int __init ib_umad_init(void)
1451 {
1452 int ret;
1453
1454 ret = register_chrdev_region(base_umad_dev,
1455 IB_UMAD_NUM_FIXED_MINOR * 2,
1456 umad_class.name);
1457 if (ret) {
1458 pr_err("couldn't register device number\n");
1459 goto out;
1460 }
1461
1462 ret = alloc_chrdev_region(&dynamic_umad_dev, 0,
1463 IB_UMAD_NUM_DYNAMIC_MINOR * 2,
1464 umad_class.name);
1465 if (ret) {
1466 pr_err("couldn't register dynamic device number\n");
1467 goto out_alloc;
1468 }
1469 dynamic_issm_dev = dynamic_umad_dev + IB_UMAD_NUM_DYNAMIC_MINOR;
1470
1471 ret = class_register(&umad_class);
1472 if (ret) {
1473 pr_err("couldn't create class infiniband_mad\n");
1474 goto out_chrdev;
1475 }
1476
1477 ret = ib_register_client(&umad_client);
1478 if (ret)
1479 goto out_class;
1480
1481 ret = ib_register_client(&issm_client);
1482 if (ret)
1483 goto out_client;
1484
1485 return 0;
1486
1487 out_client:
1488 ib_unregister_client(&umad_client);
1489 out_class:
1490 class_unregister(&umad_class);
1491
1492 out_chrdev:
1493 unregister_chrdev_region(dynamic_umad_dev,
1494 IB_UMAD_NUM_DYNAMIC_MINOR * 2);
1495
1496 out_alloc:
1497 unregister_chrdev_region(base_umad_dev,
1498 IB_UMAD_NUM_FIXED_MINOR * 2);
1499
1500 out:
1501 return ret;
1502 }
1503
ib_umad_cleanup(void)1504 static void __exit ib_umad_cleanup(void)
1505 {
1506 ib_unregister_client(&issm_client);
1507 ib_unregister_client(&umad_client);
1508 class_unregister(&umad_class);
1509 unregister_chrdev_region(base_umad_dev,
1510 IB_UMAD_NUM_FIXED_MINOR * 2);
1511 unregister_chrdev_region(dynamic_umad_dev,
1512 IB_UMAD_NUM_DYNAMIC_MINOR * 2);
1513 }
1514
1515 module_init(ib_umad_init);
1516 module_exit(ib_umad_cleanup);
1517