Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2004 Topspin Communications. All rights reserved. | |
3cd96564 | 3 | * Copyright (c) 2005 Voltaire, Inc. All rights reserved. |
cb183a06 | 4 | * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. |
2fe7e6f7 | 5 | * Copyright (c) 2008 Cisco. All rights reserved. |
1da177e4 LT |
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. | |
1da177e4 LT |
34 | */ |
35 | ||
36 | #include <linux/module.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/device.h> | |
39 | #include <linux/err.h> | |
40 | #include <linux/fs.h> | |
41 | #include <linux/cdev.h> | |
1da177e4 LT |
42 | #include <linux/dma-mapping.h> |
43 | #include <linux/poll.h> | |
2fe7e6f7 | 44 | #include <linux/mutex.h> |
1da177e4 | 45 | #include <linux/kref.h> |
a394f83b | 46 | #include <linux/compat.h> |
a99bbaf5 | 47 | #include <linux/sched.h> |
6188e10d | 48 | #include <linux/semaphore.h> |
5a0e3ad6 | 49 | #include <linux/slab.h> |
1da177e4 LT |
50 | |
51 | #include <asm/uaccess.h> | |
1da177e4 | 52 | |
a4d61e84 RD |
53 | #include <rdma/ib_mad.h> |
54 | #include <rdma/ib_user_mad.h> | |
1da177e4 LT |
55 | |
56 | MODULE_AUTHOR("Roland Dreier"); | |
57 | MODULE_DESCRIPTION("InfiniBand userspace MAD packet access"); | |
58 | MODULE_LICENSE("Dual BSD/GPL"); | |
59 | ||
60 | enum { | |
61 | IB_UMAD_MAX_PORTS = 64, | |
62 | IB_UMAD_MAX_AGENTS = 32, | |
63 | ||
64 | IB_UMAD_MAJOR = 231, | |
65 | IB_UMAD_MINOR_BASE = 0 | |
66 | }; | |
67 | ||
a74968f8 | 68 | /* |
6aa2a86e AC |
69 | * Our lifetime rules for these structs are the following: |
70 | * device special file is opened, we take a reference on the | |
71 | * ib_umad_port's struct ib_umad_device. We drop these | |
a74968f8 RD |
72 | * references in the corresponding close(). |
73 | * | |
74 | * In addition to references coming from open character devices, there | |
75 | * is one more reference to each ib_umad_device representing the | |
76 | * module's reference taken when allocating the ib_umad_device in | |
77 | * ib_umad_add_one(). | |
78 | * | |
6aa2a86e | 79 | * When destroying an ib_umad_device, we drop the module's reference. |
a74968f8 RD |
80 | */ |
81 | ||
1da177e4 | 82 | struct ib_umad_port { |
2b937afc | 83 | struct cdev cdev; |
f4e91eb4 | 84 | struct device *dev; |
1da177e4 | 85 | |
2b937afc | 86 | struct cdev sm_cdev; |
f4e91eb4 | 87 | struct device *sm_dev; |
1da177e4 LT |
88 | struct semaphore sm_sem; |
89 | ||
2fe7e6f7 | 90 | struct mutex file_mutex; |
0c99cb6d RD |
91 | struct list_head file_list; |
92 | ||
1da177e4 LT |
93 | struct ib_device *ib_dev; |
94 | struct ib_umad_device *umad_dev; | |
a74968f8 | 95 | int dev_num; |
1da177e4 LT |
96 | u8 port_num; |
97 | }; | |
98 | ||
99 | struct ib_umad_device { | |
100 | int start_port, end_port; | |
101 | struct kref ref; | |
102 | struct ib_umad_port port[0]; | |
103 | }; | |
104 | ||
105 | struct ib_umad_file { | |
2fe7e6f7 | 106 | struct mutex mutex; |
94382f35 RD |
107 | struct ib_umad_port *port; |
108 | struct list_head recv_list; | |
2527e681 | 109 | struct list_head send_list; |
94382f35 | 110 | struct list_head port_list; |
2527e681 | 111 | spinlock_t send_lock; |
94382f35 RD |
112 | wait_queue_head_t recv_wait; |
113 | struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS]; | |
114 | int agents_dead; | |
2be8e3ee RD |
115 | u8 use_pkey_index; |
116 | u8 already_used; | |
1da177e4 LT |
117 | }; |
118 | ||
119 | struct ib_umad_packet { | |
cb183a06 | 120 | struct ib_mad_send_buf *msg; |
f36e1793 | 121 | struct ib_mad_recv_wc *recv_wc; |
1da177e4 | 122 | struct list_head list; |
cb183a06 | 123 | int length; |
cb183a06 | 124 | struct ib_user_mad mad; |
1da177e4 LT |
125 | }; |
126 | ||
a74968f8 RD |
127 | static struct class *umad_class; |
128 | ||
1da177e4 | 129 | static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE); |
a74968f8 RD |
130 | |
131 | static DEFINE_SPINLOCK(port_lock); | |
9a4b65e3 | 132 | static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS); |
1da177e4 LT |
133 | |
134 | static void ib_umad_add_one(struct ib_device *device); | |
135 | static void ib_umad_remove_one(struct ib_device *device); | |
136 | ||
a74968f8 RD |
137 | static void ib_umad_release_dev(struct kref *ref) |
138 | { | |
139 | struct ib_umad_device *dev = | |
140 | container_of(ref, struct ib_umad_device, ref); | |
141 | ||
142 | kfree(dev); | |
143 | } | |
144 | ||
2be8e3ee RD |
145 | static int hdr_size(struct ib_umad_file *file) |
146 | { | |
147 | return file->use_pkey_index ? sizeof (struct ib_user_mad_hdr) : | |
148 | sizeof (struct ib_user_mad_hdr_old); | |
149 | } | |
150 | ||
2fe7e6f7 | 151 | /* caller must hold file->mutex */ |
94382f35 RD |
152 | static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id) |
153 | { | |
154 | return file->agents_dead ? NULL : file->agent[id]; | |
155 | } | |
156 | ||
1da177e4 LT |
157 | static int queue_packet(struct ib_umad_file *file, |
158 | struct ib_mad_agent *agent, | |
159 | struct ib_umad_packet *packet) | |
160 | { | |
161 | int ret = 1; | |
162 | ||
2fe7e6f7 | 163 | mutex_lock(&file->mutex); |
94382f35 | 164 | |
cb183a06 HR |
165 | for (packet->mad.hdr.id = 0; |
166 | packet->mad.hdr.id < IB_UMAD_MAX_AGENTS; | |
167 | packet->mad.hdr.id++) | |
94382f35 | 168 | if (agent == __get_agent(file, packet->mad.hdr.id)) { |
1da177e4 | 169 | list_add_tail(&packet->list, &file->recv_list); |
1da177e4 LT |
170 | wake_up_interruptible(&file->recv_wait); |
171 | ret = 0; | |
172 | break; | |
173 | } | |
174 | ||
2fe7e6f7 | 175 | mutex_unlock(&file->mutex); |
1da177e4 LT |
176 | |
177 | return ret; | |
178 | } | |
179 | ||
2527e681 SH |
180 | static void dequeue_send(struct ib_umad_file *file, |
181 | struct ib_umad_packet *packet) | |
2fe7e6f7 | 182 | { |
2527e681 SH |
183 | spin_lock_irq(&file->send_lock); |
184 | list_del(&packet->list); | |
185 | spin_unlock_irq(&file->send_lock); | |
2fe7e6f7 | 186 | } |
2527e681 | 187 | |
1da177e4 LT |
188 | static void send_handler(struct ib_mad_agent *agent, |
189 | struct ib_mad_send_wc *send_wc) | |
190 | { | |
191 | struct ib_umad_file *file = agent->context; | |
34816ad9 | 192 | struct ib_umad_packet *packet = send_wc->send_buf->context[0]; |
1da177e4 | 193 | |
2527e681 | 194 | dequeue_send(file, packet); |
34816ad9 | 195 | ib_destroy_ah(packet->msg->ah); |
cb183a06 | 196 | ib_free_send_mad(packet->msg); |
1da177e4 LT |
197 | |
198 | if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) { | |
f36e1793 JM |
199 | packet->length = IB_MGMT_MAD_HDR; |
200 | packet->mad.hdr.status = ETIMEDOUT; | |
201 | if (!queue_packet(file, agent, packet)) | |
202 | return; | |
cb183a06 | 203 | } |
1da177e4 LT |
204 | kfree(packet); |
205 | } | |
206 | ||
207 | static void recv_handler(struct ib_mad_agent *agent, | |
208 | struct ib_mad_recv_wc *mad_recv_wc) | |
209 | { | |
210 | struct ib_umad_file *file = agent->context; | |
211 | struct ib_umad_packet *packet; | |
212 | ||
213 | if (mad_recv_wc->wc->status != IB_WC_SUCCESS) | |
f36e1793 | 214 | goto err1; |
1da177e4 | 215 | |
f36e1793 | 216 | packet = kzalloc(sizeof *packet, GFP_KERNEL); |
1da177e4 | 217 | if (!packet) |
f36e1793 | 218 | goto err1; |
1da177e4 | 219 | |
f36e1793 JM |
220 | packet->length = mad_recv_wc->mad_len; |
221 | packet->recv_wc = mad_recv_wc; | |
1da177e4 | 222 | |
2be8e3ee RD |
223 | packet->mad.hdr.status = 0; |
224 | packet->mad.hdr.length = hdr_size(file) + mad_recv_wc->mad_len; | |
225 | packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp); | |
226 | packet->mad.hdr.lid = cpu_to_be16(mad_recv_wc->wc->slid); | |
227 | packet->mad.hdr.sl = mad_recv_wc->wc->sl; | |
228 | packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits; | |
229 | packet->mad.hdr.pkey_index = mad_recv_wc->wc->pkey_index; | |
cb183a06 HR |
230 | packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH); |
231 | if (packet->mad.hdr.grh_present) { | |
aeba84a9 SH |
232 | struct ib_ah_attr ah_attr; |
233 | ||
234 | ib_init_ah_from_wc(agent->device, agent->port_num, | |
235 | mad_recv_wc->wc, mad_recv_wc->recv_buf.grh, | |
236 | &ah_attr); | |
237 | ||
238 | packet->mad.hdr.gid_index = ah_attr.grh.sgid_index; | |
239 | packet->mad.hdr.hop_limit = ah_attr.grh.hop_limit; | |
240 | packet->mad.hdr.traffic_class = ah_attr.grh.traffic_class; | |
241 | memcpy(packet->mad.hdr.gid, &ah_attr.grh.dgid, 16); | |
242 | packet->mad.hdr.flow_label = cpu_to_be32(ah_attr.grh.flow_label); | |
1da177e4 LT |
243 | } |
244 | ||
245 | if (queue_packet(file, agent, packet)) | |
f36e1793 JM |
246 | goto err2; |
247 | return; | |
1da177e4 | 248 | |
f36e1793 JM |
249 | err2: |
250 | kfree(packet); | |
251 | err1: | |
1da177e4 LT |
252 | ib_free_recv_mad(mad_recv_wc); |
253 | } | |
254 | ||
2be8e3ee RD |
255 | static ssize_t copy_recv_mad(struct ib_umad_file *file, char __user *buf, |
256 | struct ib_umad_packet *packet, size_t count) | |
f36e1793 JM |
257 | { |
258 | struct ib_mad_recv_buf *recv_buf; | |
259 | int left, seg_payload, offset, max_seg_payload; | |
260 | ||
261 | /* We need enough room to copy the first (or only) MAD segment. */ | |
262 | recv_buf = &packet->recv_wc->recv_buf; | |
263 | if ((packet->length <= sizeof (*recv_buf->mad) && | |
2be8e3ee | 264 | count < hdr_size(file) + packet->length) || |
f36e1793 | 265 | (packet->length > sizeof (*recv_buf->mad) && |
2be8e3ee | 266 | count < hdr_size(file) + sizeof (*recv_buf->mad))) |
f36e1793 JM |
267 | return -EINVAL; |
268 | ||
2be8e3ee | 269 | if (copy_to_user(buf, &packet->mad, hdr_size(file))) |
f36e1793 JM |
270 | return -EFAULT; |
271 | ||
2be8e3ee | 272 | buf += hdr_size(file); |
f36e1793 JM |
273 | seg_payload = min_t(int, packet->length, sizeof (*recv_buf->mad)); |
274 | if (copy_to_user(buf, recv_buf->mad, seg_payload)) | |
275 | return -EFAULT; | |
276 | ||
277 | if (seg_payload < packet->length) { | |
278 | /* | |
279 | * Multipacket RMPP MAD message. Copy remainder of message. | |
280 | * Note that last segment may have a shorter payload. | |
281 | */ | |
2be8e3ee | 282 | if (count < hdr_size(file) + packet->length) { |
f36e1793 JM |
283 | /* |
284 | * The buffer is too small, return the first RMPP segment, | |
285 | * which includes the RMPP message length. | |
286 | */ | |
287 | return -ENOSPC; | |
288 | } | |
618a3c03 | 289 | offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class); |
f36e1793 JM |
290 | max_seg_payload = sizeof (struct ib_mad) - offset; |
291 | ||
292 | for (left = packet->length - seg_payload, buf += seg_payload; | |
293 | left; left -= seg_payload, buf += seg_payload) { | |
294 | recv_buf = container_of(recv_buf->list.next, | |
295 | struct ib_mad_recv_buf, list); | |
296 | seg_payload = min(left, max_seg_payload); | |
297 | if (copy_to_user(buf, ((void *) recv_buf->mad) + offset, | |
298 | seg_payload)) | |
299 | return -EFAULT; | |
300 | } | |
301 | } | |
2be8e3ee | 302 | return hdr_size(file) + packet->length; |
f36e1793 JM |
303 | } |
304 | ||
2be8e3ee RD |
305 | static ssize_t copy_send_mad(struct ib_umad_file *file, char __user *buf, |
306 | struct ib_umad_packet *packet, size_t count) | |
f36e1793 | 307 | { |
2be8e3ee | 308 | ssize_t size = hdr_size(file) + packet->length; |
f36e1793 JM |
309 | |
310 | if (count < size) | |
311 | return -EINVAL; | |
312 | ||
2be8e3ee RD |
313 | if (copy_to_user(buf, &packet->mad, hdr_size(file))) |
314 | return -EFAULT; | |
315 | ||
316 | buf += hdr_size(file); | |
317 | ||
318 | if (copy_to_user(buf, packet->mad.data, packet->length)) | |
f36e1793 JM |
319 | return -EFAULT; |
320 | ||
321 | return size; | |
322 | } | |
323 | ||
1da177e4 LT |
324 | static ssize_t ib_umad_read(struct file *filp, char __user *buf, |
325 | size_t count, loff_t *pos) | |
326 | { | |
327 | struct ib_umad_file *file = filp->private_data; | |
328 | struct ib_umad_packet *packet; | |
329 | ssize_t ret; | |
330 | ||
2be8e3ee | 331 | if (count < hdr_size(file)) |
1da177e4 LT |
332 | return -EINVAL; |
333 | ||
2fe7e6f7 | 334 | mutex_lock(&file->mutex); |
1da177e4 LT |
335 | |
336 | while (list_empty(&file->recv_list)) { | |
2fe7e6f7 | 337 | mutex_unlock(&file->mutex); |
1da177e4 LT |
338 | |
339 | if (filp->f_flags & O_NONBLOCK) | |
340 | return -EAGAIN; | |
341 | ||
342 | if (wait_event_interruptible(file->recv_wait, | |
343 | !list_empty(&file->recv_list))) | |
344 | return -ERESTARTSYS; | |
345 | ||
2fe7e6f7 | 346 | mutex_lock(&file->mutex); |
1da177e4 LT |
347 | } |
348 | ||
349 | packet = list_entry(file->recv_list.next, struct ib_umad_packet, list); | |
350 | list_del(&packet->list); | |
351 | ||
2fe7e6f7 | 352 | mutex_unlock(&file->mutex); |
1da177e4 | 353 | |
f36e1793 | 354 | if (packet->recv_wc) |
2be8e3ee | 355 | ret = copy_recv_mad(file, buf, packet, count); |
1da177e4 | 356 | else |
2be8e3ee | 357 | ret = copy_send_mad(file, buf, packet, count); |
f36e1793 | 358 | |
cb183a06 HR |
359 | if (ret < 0) { |
360 | /* Requeue packet */ | |
2fe7e6f7 | 361 | mutex_lock(&file->mutex); |
cb183a06 | 362 | list_add(&packet->list, &file->recv_list); |
2fe7e6f7 | 363 | mutex_unlock(&file->mutex); |
f36e1793 JM |
364 | } else { |
365 | if (packet->recv_wc) | |
366 | ib_free_recv_mad(packet->recv_wc); | |
cb183a06 | 367 | kfree(packet); |
f36e1793 | 368 | } |
1da177e4 LT |
369 | return ret; |
370 | } | |
371 | ||
f36e1793 JM |
372 | static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf) |
373 | { | |
374 | int left, seg; | |
375 | ||
376 | /* Copy class specific header */ | |
377 | if ((msg->hdr_len > IB_MGMT_RMPP_HDR) && | |
378 | copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR, | |
379 | msg->hdr_len - IB_MGMT_RMPP_HDR)) | |
380 | return -EFAULT; | |
381 | ||
382 | /* All headers are in place. Copy data segments. */ | |
383 | for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0; | |
384 | seg++, left -= msg->seg_size, buf += msg->seg_size) { | |
385 | if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf, | |
386 | min(left, msg->seg_size))) | |
387 | return -EFAULT; | |
388 | } | |
389 | return 0; | |
390 | } | |
391 | ||
2527e681 SH |
392 | static int same_destination(struct ib_user_mad_hdr *hdr1, |
393 | struct ib_user_mad_hdr *hdr2) | |
394 | { | |
395 | if (!hdr1->grh_present && !hdr2->grh_present) | |
396 | return (hdr1->lid == hdr2->lid); | |
397 | ||
398 | if (hdr1->grh_present && hdr2->grh_present) | |
399 | return !memcmp(hdr1->gid, hdr2->gid, 16); | |
400 | ||
401 | return 0; | |
402 | } | |
403 | ||
404 | static int is_duplicate(struct ib_umad_file *file, | |
405 | struct ib_umad_packet *packet) | |
406 | { | |
407 | struct ib_umad_packet *sent_packet; | |
408 | struct ib_mad_hdr *sent_hdr, *hdr; | |
409 | ||
410 | hdr = (struct ib_mad_hdr *) packet->mad.data; | |
411 | list_for_each_entry(sent_packet, &file->send_list, list) { | |
412 | sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data; | |
413 | ||
414 | if ((hdr->tid != sent_hdr->tid) || | |
415 | (hdr->mgmt_class != sent_hdr->mgmt_class)) | |
416 | continue; | |
417 | ||
418 | /* | |
419 | * No need to be overly clever here. If two new operations have | |
420 | * the same TID, reject the second as a duplicate. This is more | |
421 | * restrictive than required by the spec. | |
422 | */ | |
423 | if (!ib_response_mad((struct ib_mad *) hdr)) { | |
424 | if (!ib_response_mad((struct ib_mad *) sent_hdr)) | |
425 | return 1; | |
426 | continue; | |
427 | } else if (!ib_response_mad((struct ib_mad *) sent_hdr)) | |
428 | continue; | |
429 | ||
430 | if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr)) | |
431 | return 1; | |
432 | } | |
433 | ||
434 | return 0; | |
435 | } | |
436 | ||
1da177e4 LT |
437 | static ssize_t ib_umad_write(struct file *filp, const char __user *buf, |
438 | size_t count, loff_t *pos) | |
439 | { | |
440 | struct ib_umad_file *file = filp->private_data; | |
441 | struct ib_umad_packet *packet; | |
442 | struct ib_mad_agent *agent; | |
443 | struct ib_ah_attr ah_attr; | |
34816ad9 | 444 | struct ib_ah *ah; |
cb183a06 | 445 | struct ib_rmpp_mad *rmpp_mad; |
97f52eb4 | 446 | __be64 *tid; |
f36e1793 | 447 | int ret, data_len, hdr_len, copy_offset, rmpp_active; |
1da177e4 | 448 | |
2be8e3ee | 449 | if (count < hdr_size(file) + IB_MGMT_RMPP_HDR) |
1da177e4 LT |
450 | return -EINVAL; |
451 | ||
f36e1793 | 452 | packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL); |
1da177e4 LT |
453 | if (!packet) |
454 | return -ENOMEM; | |
455 | ||
2be8e3ee | 456 | if (copy_from_user(&packet->mad, buf, hdr_size(file))) { |
cb183a06 HR |
457 | ret = -EFAULT; |
458 | goto err; | |
1da177e4 LT |
459 | } |
460 | ||
caf6e3f2 | 461 | if (packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) { |
1da177e4 LT |
462 | ret = -EINVAL; |
463 | goto err; | |
464 | } | |
465 | ||
2be8e3ee RD |
466 | buf += hdr_size(file); |
467 | ||
468 | if (copy_from_user(packet->mad.data, buf, IB_MGMT_RMPP_HDR)) { | |
469 | ret = -EFAULT; | |
470 | goto err; | |
471 | } | |
472 | ||
2fe7e6f7 | 473 | mutex_lock(&file->mutex); |
1da177e4 | 474 | |
94382f35 | 475 | agent = __get_agent(file, packet->mad.hdr.id); |
1da177e4 LT |
476 | if (!agent) { |
477 | ret = -EINVAL; | |
478 | goto err_up; | |
479 | } | |
480 | ||
1da177e4 | 481 | memset(&ah_attr, 0, sizeof ah_attr); |
cb183a06 HR |
482 | ah_attr.dlid = be16_to_cpu(packet->mad.hdr.lid); |
483 | ah_attr.sl = packet->mad.hdr.sl; | |
484 | ah_attr.src_path_bits = packet->mad.hdr.path_bits; | |
1da177e4 | 485 | ah_attr.port_num = file->port->port_num; |
cb183a06 | 486 | if (packet->mad.hdr.grh_present) { |
1da177e4 | 487 | ah_attr.ah_flags = IB_AH_GRH; |
cb183a06 | 488 | memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16); |
aeba84a9 | 489 | ah_attr.grh.sgid_index = packet->mad.hdr.gid_index; |
d3f2c67f AC |
490 | ah_attr.grh.flow_label = be32_to_cpu(packet->mad.hdr.flow_label); |
491 | ah_attr.grh.hop_limit = packet->mad.hdr.hop_limit; | |
cb183a06 | 492 | ah_attr.grh.traffic_class = packet->mad.hdr.traffic_class; |
1da177e4 LT |
493 | } |
494 | ||
34816ad9 SH |
495 | ah = ib_create_ah(agent->qp->pd, &ah_attr); |
496 | if (IS_ERR(ah)) { | |
497 | ret = PTR_ERR(ah); | |
1da177e4 LT |
498 | goto err_up; |
499 | } | |
500 | ||
cb183a06 | 501 | rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data; |
618a3c03 HR |
502 | hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class); |
503 | if (!ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)) { | |
504 | copy_offset = IB_MGMT_MAD_HDR; | |
505 | rmpp_active = 0; | |
506 | } else { | |
f36e1793 JM |
507 | copy_offset = IB_MGMT_RMPP_HDR; |
508 | rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & | |
509 | IB_MGMT_RMPP_FLAG_ACTIVE; | |
cb183a06 HR |
510 | } |
511 | ||
2be8e3ee | 512 | data_len = count - hdr_size(file) - hdr_len; |
cb183a06 HR |
513 | packet->msg = ib_create_send_mad(agent, |
514 | be32_to_cpu(packet->mad.hdr.qpn), | |
2be8e3ee RD |
515 | packet->mad.hdr.pkey_index, rmpp_active, |
516 | hdr_len, data_len, GFP_KERNEL); | |
cb183a06 HR |
517 | if (IS_ERR(packet->msg)) { |
518 | ret = PTR_ERR(packet->msg); | |
519 | goto err_ah; | |
520 | } | |
1da177e4 | 521 | |
d3f2c67f | 522 | packet->msg->ah = ah; |
34816ad9 | 523 | packet->msg->timeout_ms = packet->mad.hdr.timeout_ms; |
d3f2c67f | 524 | packet->msg->retries = packet->mad.hdr.retries; |
34816ad9 | 525 | packet->msg->context[0] = packet; |
1da177e4 | 526 | |
f36e1793 | 527 | /* Copy MAD header. Any RMPP header is already in place. */ |
cb0f0910 | 528 | memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR); |
f36e1793 JM |
529 | |
530 | if (!rmpp_active) { | |
531 | if (copy_from_user(packet->msg->mad + copy_offset, | |
532 | buf + copy_offset, | |
533 | hdr_len + data_len - copy_offset)) { | |
534 | ret = -EFAULT; | |
535 | goto err_msg; | |
536 | } | |
537 | } else { | |
538 | ret = copy_rmpp_mad(packet->msg, buf); | |
539 | if (ret) | |
540 | goto err_msg; | |
cb183a06 HR |
541 | } |
542 | ||
543 | /* | |
2527e681 SH |
544 | * Set the high-order part of the transaction ID to make MADs from |
545 | * different agents unique, and allow routing responses back to the | |
546 | * original requestor. | |
cb183a06 | 547 | */ |
2527e681 | 548 | if (!ib_response_mad(packet->msg->mad)) { |
089a1bed | 549 | tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid; |
cb183a06 HR |
550 | *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 | |
551 | (be64_to_cpup(tid) & 0xffffffff)); | |
2527e681 SH |
552 | rmpp_mad->mad_hdr.tid = *tid; |
553 | } | |
554 | ||
555 | spin_lock_irq(&file->send_lock); | |
556 | ret = is_duplicate(file, packet); | |
557 | if (!ret) | |
558 | list_add_tail(&packet->list, &file->send_list); | |
559 | spin_unlock_irq(&file->send_lock); | |
560 | if (ret) { | |
561 | ret = -EINVAL; | |
562 | goto err_msg; | |
1da177e4 LT |
563 | } |
564 | ||
34816ad9 | 565 | ret = ib_post_send_mad(packet->msg, NULL); |
cb183a06 | 566 | if (ret) |
2527e681 | 567 | goto err_send; |
cb183a06 | 568 | |
2fe7e6f7 | 569 | mutex_unlock(&file->mutex); |
cb0f0910 | 570 | return count; |
cb183a06 | 571 | |
2527e681 SH |
572 | err_send: |
573 | dequeue_send(file, packet); | |
cb183a06 HR |
574 | err_msg: |
575 | ib_free_send_mad(packet->msg); | |
cb183a06 | 576 | err_ah: |
34816ad9 | 577 | ib_destroy_ah(ah); |
1da177e4 | 578 | err_up: |
2fe7e6f7 | 579 | mutex_unlock(&file->mutex); |
1da177e4 LT |
580 | err: |
581 | kfree(packet); | |
582 | return ret; | |
583 | } | |
584 | ||
585 | static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait) | |
586 | { | |
587 | struct ib_umad_file *file = filp->private_data; | |
588 | ||
589 | /* we will always be able to post a MAD send */ | |
590 | unsigned int mask = POLLOUT | POLLWRNORM; | |
591 | ||
592 | poll_wait(filp, &file->recv_wait, wait); | |
593 | ||
594 | if (!list_empty(&file->recv_list)) | |
595 | mask |= POLLIN | POLLRDNORM; | |
596 | ||
597 | return mask; | |
598 | } | |
599 | ||
a394f83b RD |
600 | static int ib_umad_reg_agent(struct ib_umad_file *file, void __user *arg, |
601 | int compat_method_mask) | |
1da177e4 LT |
602 | { |
603 | struct ib_user_mad_reg_req ureq; | |
604 | struct ib_mad_reg_req req; | |
2fe7e6f7 | 605 | struct ib_mad_agent *agent = NULL; |
1da177e4 LT |
606 | int agent_id; |
607 | int ret; | |
608 | ||
2fe7e6f7 RD |
609 | mutex_lock(&file->port->file_mutex); |
610 | mutex_lock(&file->mutex); | |
0c99cb6d RD |
611 | |
612 | if (!file->port->ib_dev) { | |
613 | ret = -EPIPE; | |
614 | goto out; | |
615 | } | |
1da177e4 | 616 | |
a394f83b | 617 | if (copy_from_user(&ureq, arg, sizeof ureq)) { |
1da177e4 LT |
618 | ret = -EFAULT; |
619 | goto out; | |
620 | } | |
621 | ||
622 | if (ureq.qpn != 0 && ureq.qpn != 1) { | |
623 | ret = -EINVAL; | |
624 | goto out; | |
625 | } | |
626 | ||
627 | for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id) | |
94382f35 | 628 | if (!__get_agent(file, agent_id)) |
1da177e4 LT |
629 | goto found; |
630 | ||
631 | ret = -ENOMEM; | |
632 | goto out; | |
633 | ||
634 | found: | |
0df3bb13 RD |
635 | if (ureq.mgmt_class) { |
636 | req.mgmt_class = ureq.mgmt_class; | |
637 | req.mgmt_class_version = ureq.mgmt_class_version; | |
a394f83b RD |
638 | memcpy(req.oui, ureq.oui, sizeof req.oui); |
639 | ||
640 | if (compat_method_mask) { | |
641 | u32 *umm = (u32 *) ureq.method_mask; | |
642 | int i; | |
643 | ||
644 | for (i = 0; i < BITS_TO_LONGS(IB_MGMT_MAX_METHODS); ++i) | |
645 | req.method_mask[i] = | |
646 | umm[i * 2] | ((u64) umm[i * 2 + 1] << 32); | |
647 | } else | |
648 | memcpy(req.method_mask, ureq.method_mask, | |
649 | sizeof req.method_mask); | |
0df3bb13 | 650 | } |
1da177e4 LT |
651 | |
652 | agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num, | |
653 | ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI, | |
0df3bb13 | 654 | ureq.mgmt_class ? &req : NULL, |
cb183a06 HR |
655 | ureq.rmpp_version, |
656 | send_handler, recv_handler, file); | |
1da177e4 LT |
657 | if (IS_ERR(agent)) { |
658 | ret = PTR_ERR(agent); | |
2fe7e6f7 | 659 | agent = NULL; |
1da177e4 LT |
660 | goto out; |
661 | } | |
662 | ||
1da177e4 LT |
663 | if (put_user(agent_id, |
664 | (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) { | |
665 | ret = -EFAULT; | |
ec914c52 | 666 | goto out; |
1da177e4 LT |
667 | } |
668 | ||
2be8e3ee RD |
669 | if (!file->already_used) { |
670 | file->already_used = 1; | |
671 | if (!file->use_pkey_index) { | |
672 | printk(KERN_WARNING "user_mad: process %s did not enable " | |
673 | "P_Key index support.\n", current->comm); | |
674 | printk(KERN_WARNING "user_mad: Documentation/infiniband/user_mad.txt " | |
675 | "has info on the new ABI.\n"); | |
676 | } | |
677 | } | |
678 | ||
2f76e829 | 679 | file->agent[agent_id] = agent; |
1da177e4 | 680 | ret = 0; |
2f76e829 | 681 | |
1da177e4 | 682 | out: |
2fe7e6f7 RD |
683 | mutex_unlock(&file->mutex); |
684 | ||
685 | if (ret && agent) | |
686 | ib_unregister_mad_agent(agent); | |
687 | ||
688 | mutex_unlock(&file->port->file_mutex); | |
689 | ||
1da177e4 LT |
690 | return ret; |
691 | } | |
692 | ||
a394f83b | 693 | static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg) |
1da177e4 | 694 | { |
2f76e829 | 695 | struct ib_mad_agent *agent = NULL; |
1da177e4 LT |
696 | u32 id; |
697 | int ret = 0; | |
698 | ||
a394f83b | 699 | if (get_user(id, arg)) |
2f76e829 | 700 | return -EFAULT; |
1da177e4 | 701 | |
2fe7e6f7 RD |
702 | mutex_lock(&file->port->file_mutex); |
703 | mutex_lock(&file->mutex); | |
1da177e4 | 704 | |
caf6e3f2 | 705 | if (id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) { |
1da177e4 LT |
706 | ret = -EINVAL; |
707 | goto out; | |
708 | } | |
709 | ||
2f76e829 | 710 | agent = file->agent[id]; |
1da177e4 LT |
711 | file->agent[id] = NULL; |
712 | ||
713 | out: | |
2fe7e6f7 | 714 | mutex_unlock(&file->mutex); |
2f76e829 | 715 | |
ec914c52 | 716 | if (agent) |
2f76e829 | 717 | ib_unregister_mad_agent(agent); |
2f76e829 | 718 | |
2fe7e6f7 RD |
719 | mutex_unlock(&file->port->file_mutex); |
720 | ||
1da177e4 LT |
721 | return ret; |
722 | } | |
723 | ||
2be8e3ee RD |
724 | static long ib_umad_enable_pkey(struct ib_umad_file *file) |
725 | { | |
726 | int ret = 0; | |
727 | ||
2fe7e6f7 | 728 | mutex_lock(&file->mutex); |
2be8e3ee RD |
729 | if (file->already_used) |
730 | ret = -EINVAL; | |
731 | else | |
732 | file->use_pkey_index = 1; | |
2fe7e6f7 | 733 | mutex_unlock(&file->mutex); |
2be8e3ee RD |
734 | |
735 | return ret; | |
736 | } | |
737 | ||
cb183a06 HR |
738 | static long ib_umad_ioctl(struct file *filp, unsigned int cmd, |
739 | unsigned long arg) | |
1da177e4 LT |
740 | { |
741 | switch (cmd) { | |
742 | case IB_USER_MAD_REGISTER_AGENT: | |
a394f83b | 743 | return ib_umad_reg_agent(filp->private_data, (void __user *) arg, 0); |
1da177e4 | 744 | case IB_USER_MAD_UNREGISTER_AGENT: |
a394f83b | 745 | return ib_umad_unreg_agent(filp->private_data, (__u32 __user *) arg); |
2be8e3ee RD |
746 | case IB_USER_MAD_ENABLE_PKEY: |
747 | return ib_umad_enable_pkey(filp->private_data); | |
1da177e4 LT |
748 | default: |
749 | return -ENOIOCTLCMD; | |
750 | } | |
751 | } | |
752 | ||
a394f83b RD |
753 | #ifdef CONFIG_COMPAT |
754 | static long ib_umad_compat_ioctl(struct file *filp, unsigned int cmd, | |
755 | unsigned long arg) | |
756 | { | |
757 | switch (cmd) { | |
758 | case IB_USER_MAD_REGISTER_AGENT: | |
759 | return ib_umad_reg_agent(filp->private_data, compat_ptr(arg), 1); | |
760 | case IB_USER_MAD_UNREGISTER_AGENT: | |
761 | return ib_umad_unreg_agent(filp->private_data, compat_ptr(arg)); | |
762 | case IB_USER_MAD_ENABLE_PKEY: | |
763 | return ib_umad_enable_pkey(filp->private_data); | |
764 | default: | |
765 | return -ENOIOCTLCMD; | |
766 | } | |
767 | } | |
768 | #endif | |
769 | ||
feae1ef1 RD |
770 | /* |
771 | * ib_umad_open() does not need the BKL: | |
772 | * | |
6aa2a86e | 773 | * - the ib_umad_port structures are properly reference counted, and |
feae1ef1 RD |
774 | * everything else is purely local to the file being created, so |
775 | * races against other open calls are not a problem; | |
776 | * - the ioctl method does not affect any global state outside of the | |
777 | * file structure being operated on; | |
feae1ef1 | 778 | */ |
1da177e4 LT |
779 | static int ib_umad_open(struct inode *inode, struct file *filp) |
780 | { | |
a74968f8 | 781 | struct ib_umad_port *port; |
1da177e4 | 782 | struct ib_umad_file *file; |
bc1db9af | 783 | int ret; |
1da177e4 | 784 | |
6aa2a86e | 785 | port = container_of(inode->i_cdev, struct ib_umad_port, cdev); |
a74968f8 RD |
786 | if (port) |
787 | kref_get(&port->umad_dev->ref); | |
6aa2a86e | 788 | else |
a74968f8 RD |
789 | return -ENXIO; |
790 | ||
2fe7e6f7 | 791 | mutex_lock(&port->file_mutex); |
0c99cb6d RD |
792 | |
793 | if (!port->ib_dev) { | |
794 | ret = -ENXIO; | |
795 | goto out; | |
796 | } | |
797 | ||
cb0f0910 | 798 | file = kzalloc(sizeof *file, GFP_KERNEL); |
a74968f8 RD |
799 | if (!file) { |
800 | kref_put(&port->umad_dev->ref, ib_umad_release_dev); | |
0c99cb6d RD |
801 | ret = -ENOMEM; |
802 | goto out; | |
a74968f8 | 803 | } |
1da177e4 | 804 | |
2fe7e6f7 | 805 | mutex_init(&file->mutex); |
2527e681 | 806 | spin_lock_init(&file->send_lock); |
1da177e4 | 807 | INIT_LIST_HEAD(&file->recv_list); |
2527e681 | 808 | INIT_LIST_HEAD(&file->send_list); |
1da177e4 LT |
809 | init_waitqueue_head(&file->recv_wait); |
810 | ||
811 | file->port = port; | |
812 | filp->private_data = file; | |
813 | ||
0c99cb6d RD |
814 | list_add_tail(&file->port_list, &port->file_list); |
815 | ||
bc1db9af RD |
816 | ret = nonseekable_open(inode, filp); |
817 | ||
0c99cb6d | 818 | out: |
2fe7e6f7 | 819 | mutex_unlock(&port->file_mutex); |
0c99cb6d | 820 | return ret; |
1da177e4 LT |
821 | } |
822 | ||
823 | static int ib_umad_close(struct inode *inode, struct file *filp) | |
824 | { | |
825 | struct ib_umad_file *file = filp->private_data; | |
a74968f8 | 826 | struct ib_umad_device *dev = file->port->umad_dev; |
561e148e | 827 | struct ib_umad_packet *packet, *tmp; |
94382f35 | 828 | int already_dead; |
1da177e4 LT |
829 | int i; |
830 | ||
2fe7e6f7 RD |
831 | mutex_lock(&file->port->file_mutex); |
832 | mutex_lock(&file->mutex); | |
94382f35 RD |
833 | |
834 | already_dead = file->agents_dead; | |
835 | file->agents_dead = 1; | |
1da177e4 | 836 | |
f36e1793 JM |
837 | list_for_each_entry_safe(packet, tmp, &file->recv_list, list) { |
838 | if (packet->recv_wc) | |
839 | ib_free_recv_mad(packet->recv_wc); | |
561e148e | 840 | kfree(packet); |
f36e1793 | 841 | } |
561e148e | 842 | |
0c99cb6d | 843 | list_del(&file->port_list); |
0c99cb6d | 844 | |
2fe7e6f7 | 845 | mutex_unlock(&file->mutex); |
94382f35 RD |
846 | |
847 | if (!already_dead) | |
848 | for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i) | |
849 | if (file->agent[i]) | |
850 | ib_unregister_mad_agent(file->agent[i]); | |
1da177e4 | 851 | |
2fe7e6f7 | 852 | mutex_unlock(&file->port->file_mutex); |
94382f35 RD |
853 | |
854 | kfree(file); | |
a74968f8 RD |
855 | kref_put(&dev->ref, ib_umad_release_dev); |
856 | ||
1da177e4 LT |
857 | return 0; |
858 | } | |
859 | ||
2b8693c0 | 860 | static const struct file_operations umad_fops = { |
d3f2c67f AC |
861 | .owner = THIS_MODULE, |
862 | .read = ib_umad_read, | |
863 | .write = ib_umad_write, | |
864 | .poll = ib_umad_poll, | |
1da177e4 | 865 | .unlocked_ioctl = ib_umad_ioctl, |
a394f83b | 866 | #ifdef CONFIG_COMPAT |
d3f2c67f | 867 | .compat_ioctl = ib_umad_compat_ioctl, |
a394f83b | 868 | #endif |
d3f2c67f | 869 | .open = ib_umad_open, |
bc1db9af RD |
870 | .release = ib_umad_close, |
871 | .llseek = no_llseek, | |
1da177e4 LT |
872 | }; |
873 | ||
874 | static int ib_umad_sm_open(struct inode *inode, struct file *filp) | |
875 | { | |
a74968f8 | 876 | struct ib_umad_port *port; |
1da177e4 LT |
877 | struct ib_port_modify props = { |
878 | .set_port_cap_mask = IB_PORT_SM | |
879 | }; | |
880 | int ret; | |
881 | ||
6aa2a86e | 882 | port = container_of(inode->i_cdev, struct ib_umad_port, sm_cdev); |
a74968f8 RD |
883 | if (port) |
884 | kref_get(&port->umad_dev->ref); | |
6aa2a86e | 885 | else |
a74968f8 RD |
886 | return -ENXIO; |
887 | ||
1da177e4 | 888 | if (filp->f_flags & O_NONBLOCK) { |
a74968f8 RD |
889 | if (down_trylock(&port->sm_sem)) { |
890 | ret = -EAGAIN; | |
891 | goto fail; | |
892 | } | |
1da177e4 | 893 | } else { |
a74968f8 RD |
894 | if (down_interruptible(&port->sm_sem)) { |
895 | ret = -ERESTARTSYS; | |
896 | goto fail; | |
897 | } | |
1da177e4 LT |
898 | } |
899 | ||
900 | ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props); | |
901 | if (ret) { | |
902 | up(&port->sm_sem); | |
a74968f8 | 903 | goto fail; |
1da177e4 LT |
904 | } |
905 | ||
906 | filp->private_data = port; | |
907 | ||
bc1db9af | 908 | return nonseekable_open(inode, filp); |
a74968f8 RD |
909 | |
910 | fail: | |
911 | kref_put(&port->umad_dev->ref, ib_umad_release_dev); | |
912 | return ret; | |
1da177e4 LT |
913 | } |
914 | ||
915 | static int ib_umad_sm_close(struct inode *inode, struct file *filp) | |
916 | { | |
917 | struct ib_umad_port *port = filp->private_data; | |
918 | struct ib_port_modify props = { | |
919 | .clr_port_cap_mask = IB_PORT_SM | |
920 | }; | |
0c99cb6d RD |
921 | int ret = 0; |
922 | ||
2fe7e6f7 | 923 | mutex_lock(&port->file_mutex); |
0c99cb6d RD |
924 | if (port->ib_dev) |
925 | ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props); | |
2fe7e6f7 | 926 | mutex_unlock(&port->file_mutex); |
1da177e4 | 927 | |
1da177e4 LT |
928 | up(&port->sm_sem); |
929 | ||
a74968f8 RD |
930 | kref_put(&port->umad_dev->ref, ib_umad_release_dev); |
931 | ||
1da177e4 LT |
932 | return ret; |
933 | } | |
934 | ||
2b8693c0 | 935 | static const struct file_operations umad_sm_fops = { |
d3f2c67f AC |
936 | .owner = THIS_MODULE, |
937 | .open = ib_umad_sm_open, | |
bc1db9af RD |
938 | .release = ib_umad_sm_close, |
939 | .llseek = no_llseek, | |
1da177e4 LT |
940 | }; |
941 | ||
942 | static struct ib_client umad_client = { | |
943 | .name = "umad", | |
944 | .add = ib_umad_add_one, | |
945 | .remove = ib_umad_remove_one | |
946 | }; | |
947 | ||
f4e91eb4 TJ |
948 | static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr, |
949 | char *buf) | |
1da177e4 | 950 | { |
f4e91eb4 | 951 | struct ib_umad_port *port = dev_get_drvdata(dev); |
1da177e4 | 952 | |
a74968f8 RD |
953 | if (!port) |
954 | return -ENODEV; | |
955 | ||
1da177e4 LT |
956 | return sprintf(buf, "%s\n", port->ib_dev->name); |
957 | } | |
f4e91eb4 | 958 | static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); |
1da177e4 | 959 | |
f4e91eb4 TJ |
960 | static ssize_t show_port(struct device *dev, struct device_attribute *attr, |
961 | char *buf) | |
1da177e4 | 962 | { |
f4e91eb4 | 963 | struct ib_umad_port *port = dev_get_drvdata(dev); |
1da177e4 | 964 | |
a74968f8 RD |
965 | if (!port) |
966 | return -ENODEV; | |
967 | ||
1da177e4 LT |
968 | return sprintf(buf, "%d\n", port->port_num); |
969 | } | |
f4e91eb4 | 970 | static DEVICE_ATTR(port, S_IRUGO, show_port, NULL); |
1da177e4 | 971 | |
0933e2d9 AK |
972 | static CLASS_ATTR_STRING(abi_version, S_IRUGO, |
973 | __stringify(IB_USER_MAD_ABI_VERSION)); | |
1da177e4 | 974 | |
8698d3fe AC |
975 | static dev_t overflow_maj; |
976 | static DECLARE_BITMAP(overflow_map, IB_UMAD_MAX_PORTS); | |
977 | static int find_overflow_devnum(void) | |
978 | { | |
979 | int ret; | |
980 | ||
981 | if (!overflow_maj) { | |
982 | ret = alloc_chrdev_region(&overflow_maj, 0, IB_UMAD_MAX_PORTS * 2, | |
983 | "infiniband_mad"); | |
984 | if (ret) { | |
985 | printk(KERN_ERR "user_mad: couldn't register dynamic device number\n"); | |
986 | return ret; | |
987 | } | |
988 | } | |
989 | ||
990 | ret = find_first_zero_bit(overflow_map, IB_UMAD_MAX_PORTS); | |
991 | if (ret >= IB_UMAD_MAX_PORTS) | |
992 | return -1; | |
993 | ||
994 | return ret; | |
995 | } | |
996 | ||
1da177e4 LT |
997 | static int ib_umad_init_port(struct ib_device *device, int port_num, |
998 | struct ib_umad_port *port) | |
999 | { | |
d451b8df | 1000 | int devnum; |
dc2ed5e3 | 1001 | dev_t base; |
d451b8df | 1002 | |
a74968f8 | 1003 | spin_lock(&port_lock); |
d451b8df AC |
1004 | devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS); |
1005 | if (devnum >= IB_UMAD_MAX_PORTS) { | |
a74968f8 | 1006 | spin_unlock(&port_lock); |
8698d3fe AC |
1007 | devnum = find_overflow_devnum(); |
1008 | if (devnum < 0) | |
1009 | return -1; | |
1010 | ||
1011 | spin_lock(&port_lock); | |
1012 | port->dev_num = devnum + IB_UMAD_MAX_PORTS; | |
1013 | base = devnum + overflow_maj; | |
1014 | set_bit(devnum, overflow_map); | |
1015 | } else { | |
1016 | port->dev_num = devnum; | |
1017 | base = devnum + base_dev; | |
1018 | set_bit(devnum, dev_map); | |
1da177e4 | 1019 | } |
a74968f8 | 1020 | spin_unlock(&port_lock); |
1da177e4 LT |
1021 | |
1022 | port->ib_dev = device; | |
1023 | port->port_num = port_num; | |
557d0540 | 1024 | sema_init(&port->sm_sem, 1); |
2fe7e6f7 | 1025 | mutex_init(&port->file_mutex); |
0c99cb6d | 1026 | INIT_LIST_HEAD(&port->file_list); |
1da177e4 | 1027 | |
2b937afc AC |
1028 | cdev_init(&port->cdev, &umad_fops); |
1029 | port->cdev.owner = THIS_MODULE; | |
1030 | kobject_set_name(&port->cdev.kobj, "umad%d", port->dev_num); | |
dc2ed5e3 | 1031 | if (cdev_add(&port->cdev, base, 1)) |
1da177e4 LT |
1032 | goto err_cdev; |
1033 | ||
91bd418f | 1034 | port->dev = device_create(umad_class, device->dma_device, |
2b937afc | 1035 | port->cdev.dev, port, |
91bd418f | 1036 | "umad%d", port->dev_num); |
f4e91eb4 | 1037 | if (IS_ERR(port->dev)) |
a74968f8 | 1038 | goto err_cdev; |
1da177e4 | 1039 | |
f4e91eb4 TJ |
1040 | if (device_create_file(port->dev, &dev_attr_ibdev)) |
1041 | goto err_dev; | |
1042 | if (device_create_file(port->dev, &dev_attr_port)) | |
1043 | goto err_dev; | |
1044 | ||
dc2ed5e3 | 1045 | base += IB_UMAD_MAX_PORTS; |
2b937afc AC |
1046 | cdev_init(&port->sm_cdev, &umad_sm_fops); |
1047 | port->sm_cdev.owner = THIS_MODULE; | |
1048 | kobject_set_name(&port->sm_cdev.kobj, "issm%d", port->dev_num); | |
dc2ed5e3 | 1049 | if (cdev_add(&port->sm_cdev, base, 1)) |
a74968f8 | 1050 | goto err_sm_cdev; |
1da177e4 | 1051 | |
91bd418f | 1052 | port->sm_dev = device_create(umad_class, device->dma_device, |
2b937afc | 1053 | port->sm_cdev.dev, port, |
91bd418f | 1054 | "issm%d", port->dev_num); |
f4e91eb4 | 1055 | if (IS_ERR(port->sm_dev)) |
1da177e4 LT |
1056 | goto err_sm_cdev; |
1057 | ||
f4e91eb4 TJ |
1058 | if (device_create_file(port->sm_dev, &dev_attr_ibdev)) |
1059 | goto err_sm_dev; | |
1060 | if (device_create_file(port->sm_dev, &dev_attr_port)) | |
1061 | goto err_sm_dev; | |
1da177e4 LT |
1062 | |
1063 | return 0; | |
1064 | ||
f4e91eb4 | 1065 | err_sm_dev: |
2b937afc | 1066 | device_destroy(umad_class, port->sm_cdev.dev); |
1da177e4 LT |
1067 | |
1068 | err_sm_cdev: | |
2b937afc | 1069 | cdev_del(&port->sm_cdev); |
1da177e4 | 1070 | |
f4e91eb4 | 1071 | err_dev: |
2b937afc | 1072 | device_destroy(umad_class, port->cdev.dev); |
1da177e4 LT |
1073 | |
1074 | err_cdev: | |
2b937afc | 1075 | cdev_del(&port->cdev); |
8698d3fe AC |
1076 | if (port->dev_num < IB_UMAD_MAX_PORTS) |
1077 | clear_bit(devnum, dev_map); | |
1078 | else | |
1079 | clear_bit(devnum, overflow_map); | |
1da177e4 LT |
1080 | |
1081 | return -1; | |
1082 | } | |
1083 | ||
a74968f8 RD |
1084 | static void ib_umad_kill_port(struct ib_umad_port *port) |
1085 | { | |
0c99cb6d RD |
1086 | struct ib_umad_file *file; |
1087 | int id; | |
1088 | ||
f4e91eb4 TJ |
1089 | dev_set_drvdata(port->dev, NULL); |
1090 | dev_set_drvdata(port->sm_dev, NULL); | |
a74968f8 | 1091 | |
2b937afc AC |
1092 | device_destroy(umad_class, port->cdev.dev); |
1093 | device_destroy(umad_class, port->sm_cdev.dev); | |
a74968f8 | 1094 | |
2b937afc AC |
1095 | cdev_del(&port->cdev); |
1096 | cdev_del(&port->sm_cdev); | |
a74968f8 | 1097 | |
2fe7e6f7 | 1098 | mutex_lock(&port->file_mutex); |
0c99cb6d RD |
1099 | |
1100 | port->ib_dev = NULL; | |
1101 | ||
2fe7e6f7 RD |
1102 | list_for_each_entry(file, &port->file_list, port_list) { |
1103 | mutex_lock(&file->mutex); | |
94382f35 | 1104 | file->agents_dead = 1; |
2fe7e6f7 | 1105 | mutex_unlock(&file->mutex); |
94382f35 RD |
1106 | |
1107 | for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id) | |
1108 | if (file->agent[id]) | |
1109 | ib_unregister_mad_agent(file->agent[id]); | |
94382f35 | 1110 | } |
0c99cb6d | 1111 | |
2fe7e6f7 | 1112 | mutex_unlock(&port->file_mutex); |
0c99cb6d | 1113 | |
8698d3fe AC |
1114 | if (port->dev_num < IB_UMAD_MAX_PORTS) |
1115 | clear_bit(port->dev_num, dev_map); | |
1116 | else | |
1117 | clear_bit(port->dev_num - IB_UMAD_MAX_PORTS, overflow_map); | |
a74968f8 RD |
1118 | } |
1119 | ||
1da177e4 LT |
1120 | static void ib_umad_add_one(struct ib_device *device) |
1121 | { | |
1122 | struct ib_umad_device *umad_dev; | |
1123 | int s, e, i; | |
1124 | ||
07ebafba TT |
1125 | if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) |
1126 | return; | |
1127 | ||
1128 | if (device->node_type == RDMA_NODE_IB_SWITCH) | |
1da177e4 LT |
1129 | s = e = 0; |
1130 | else { | |
1131 | s = 1; | |
1132 | e = device->phys_port_cnt; | |
1133 | } | |
1134 | ||
cb0f0910 | 1135 | umad_dev = kzalloc(sizeof *umad_dev + |
1da177e4 LT |
1136 | (e - s + 1) * sizeof (struct ib_umad_port), |
1137 | GFP_KERNEL); | |
1138 | if (!umad_dev) | |
1139 | return; | |
1140 | ||
1da177e4 LT |
1141 | kref_init(&umad_dev->ref); |
1142 | ||
1143 | umad_dev->start_port = s; | |
1144 | umad_dev->end_port = e; | |
1145 | ||
1146 | for (i = s; i <= e; ++i) { | |
1147 | umad_dev->port[i - s].umad_dev = umad_dev; | |
1148 | ||
1149 | if (ib_umad_init_port(device, i, &umad_dev->port[i - s])) | |
1150 | goto err; | |
1151 | } | |
1152 | ||
1153 | ib_set_client_data(device, &umad_client, umad_dev); | |
1154 | ||
1155 | return; | |
1156 | ||
1157 | err: | |
a74968f8 | 1158 | while (--i >= s) |
8b37b947 | 1159 | ib_umad_kill_port(&umad_dev->port[i - s]); |
1da177e4 LT |
1160 | |
1161 | kref_put(&umad_dev->ref, ib_umad_release_dev); | |
1162 | } | |
1163 | ||
1164 | static void ib_umad_remove_one(struct ib_device *device) | |
1165 | { | |
1166 | struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client); | |
1167 | int i; | |
1168 | ||
1169 | if (!umad_dev) | |
1170 | return; | |
1171 | ||
a74968f8 RD |
1172 | for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i) |
1173 | ib_umad_kill_port(&umad_dev->port[i]); | |
1da177e4 LT |
1174 | |
1175 | kref_put(&umad_dev->ref, ib_umad_release_dev); | |
1176 | } | |
1177 | ||
2c9ede55 | 1178 | static char *umad_devnode(struct device *dev, umode_t *mode) |
c3af0980 RD |
1179 | { |
1180 | return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); | |
1181 | } | |
1182 | ||
1da177e4 LT |
1183 | static int __init ib_umad_init(void) |
1184 | { | |
1185 | int ret; | |
1186 | ||
1da177e4 LT |
1187 | ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2, |
1188 | "infiniband_mad"); | |
1189 | if (ret) { | |
1190 | printk(KERN_ERR "user_mad: couldn't register device number\n"); | |
1191 | goto out; | |
1192 | } | |
1193 | ||
a74968f8 RD |
1194 | umad_class = class_create(THIS_MODULE, "infiniband_mad"); |
1195 | if (IS_ERR(umad_class)) { | |
1196 | ret = PTR_ERR(umad_class); | |
1da177e4 LT |
1197 | printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n"); |
1198 | goto out_chrdev; | |
1199 | } | |
1200 | ||
c3af0980 RD |
1201 | umad_class->devnode = umad_devnode; |
1202 | ||
0933e2d9 | 1203 | ret = class_create_file(umad_class, &class_attr_abi_version.attr); |
1da177e4 LT |
1204 | if (ret) { |
1205 | printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n"); | |
1206 | goto out_class; | |
1207 | } | |
1208 | ||
1209 | ret = ib_register_client(&umad_client); | |
1210 | if (ret) { | |
1211 | printk(KERN_ERR "user_mad: couldn't register ib_umad client\n"); | |
1212 | goto out_class; | |
1213 | } | |
1214 | ||
1215 | return 0; | |
1216 | ||
1217 | out_class: | |
a74968f8 | 1218 | class_destroy(umad_class); |
1da177e4 LT |
1219 | |
1220 | out_chrdev: | |
1221 | unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2); | |
1222 | ||
1223 | out: | |
1224 | return ret; | |
1225 | } | |
1226 | ||
1227 | static void __exit ib_umad_cleanup(void) | |
1228 | { | |
1229 | ib_unregister_client(&umad_client); | |
a74968f8 | 1230 | class_destroy(umad_class); |
1da177e4 | 1231 | unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2); |
8698d3fe AC |
1232 | if (overflow_maj) |
1233 | unregister_chrdev_region(overflow_maj, IB_UMAD_MAX_PORTS * 2); | |
1da177e4 LT |
1234 | } |
1235 | ||
1236 | module_init(ib_umad_init); | |
1237 | module_exit(ib_umad_cleanup); |