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. |
1da177e4 LT |
5 | * |
6 | * This software is available to you under a choice of one of two | |
7 | * licenses. You may choose to be licensed under the terms of the GNU | |
8 | * General Public License (GPL) Version 2, available from the file | |
9 | * COPYING in the main directory of this source tree, or the | |
10 | * OpenIB.org BSD license below: | |
11 | * | |
12 | * Redistribution and use in source and binary forms, with or | |
13 | * without modification, are permitted provided that the following | |
14 | * conditions are met: | |
15 | * | |
16 | * - Redistributions of source code must retain the above | |
17 | * copyright notice, this list of conditions and the following | |
18 | * disclaimer. | |
19 | * | |
20 | * - Redistributions in binary form must reproduce the above | |
21 | * copyright notice, this list of conditions and the following | |
22 | * disclaimer in the documentation and/or other materials | |
23 | * provided with the distribution. | |
24 | * | |
25 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
26 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
27 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
28 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
29 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
30 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
31 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
32 | * SOFTWARE. | |
33 | * | |
f36e1793 | 34 | * $Id: user_mad.c 5596 2006-03-03 01:00:07Z sean.hefty $ |
1da177e4 LT |
35 | */ |
36 | ||
37 | #include <linux/module.h> | |
38 | #include <linux/init.h> | |
39 | #include <linux/device.h> | |
40 | #include <linux/err.h> | |
41 | #include <linux/fs.h> | |
42 | #include <linux/cdev.h> | |
1da177e4 LT |
43 | #include <linux/dma-mapping.h> |
44 | #include <linux/poll.h> | |
45 | #include <linux/rwsem.h> | |
46 | #include <linux/kref.h> | |
47 | ||
48 | #include <asm/uaccess.h> | |
49 | #include <asm/semaphore.h> | |
50 | ||
a4d61e84 RD |
51 | #include <rdma/ib_mad.h> |
52 | #include <rdma/ib_user_mad.h> | |
1da177e4 LT |
53 | |
54 | MODULE_AUTHOR("Roland Dreier"); | |
55 | MODULE_DESCRIPTION("InfiniBand userspace MAD packet access"); | |
56 | MODULE_LICENSE("Dual BSD/GPL"); | |
57 | ||
58 | enum { | |
59 | IB_UMAD_MAX_PORTS = 64, | |
60 | IB_UMAD_MAX_AGENTS = 32, | |
61 | ||
62 | IB_UMAD_MAJOR = 231, | |
63 | IB_UMAD_MINOR_BASE = 0 | |
64 | }; | |
65 | ||
a74968f8 RD |
66 | /* |
67 | * Our lifetime rules for these structs are the following: each time a | |
68 | * device special file is opened, we look up the corresponding struct | |
69 | * ib_umad_port by minor in the umad_port[] table while holding the | |
70 | * port_lock. If this lookup succeeds, we take a reference on the | |
71 | * ib_umad_port's struct ib_umad_device while still holding the | |
72 | * port_lock; if the lookup fails, we fail the open(). We drop these | |
73 | * references in the corresponding close(). | |
74 | * | |
75 | * In addition to references coming from open character devices, there | |
76 | * is one more reference to each ib_umad_device representing the | |
77 | * module's reference taken when allocating the ib_umad_device in | |
78 | * ib_umad_add_one(). | |
79 | * | |
80 | * When destroying an ib_umad_device, we clear all of its | |
81 | * ib_umad_ports from umad_port[] while holding port_lock before | |
82 | * dropping the module's reference to the ib_umad_device. This is | |
83 | * always safe because any open() calls will either succeed and obtain | |
84 | * a reference before we clear the umad_port[] entries, or fail after | |
85 | * we clear the umad_port[] entries. | |
86 | */ | |
87 | ||
1da177e4 | 88 | struct ib_umad_port { |
a74968f8 RD |
89 | struct cdev *dev; |
90 | struct class_device *class_dev; | |
1da177e4 | 91 | |
a74968f8 RD |
92 | struct cdev *sm_dev; |
93 | struct class_device *sm_class_dev; | |
1da177e4 LT |
94 | struct semaphore sm_sem; |
95 | ||
0c99cb6d RD |
96 | struct rw_semaphore mutex; |
97 | struct list_head file_list; | |
98 | ||
1da177e4 LT |
99 | struct ib_device *ib_dev; |
100 | struct ib_umad_device *umad_dev; | |
a74968f8 | 101 | int dev_num; |
1da177e4 LT |
102 | u8 port_num; |
103 | }; | |
104 | ||
105 | struct ib_umad_device { | |
106 | int start_port, end_port; | |
107 | struct kref ref; | |
108 | struct ib_umad_port port[0]; | |
109 | }; | |
110 | ||
111 | struct ib_umad_file { | |
94382f35 RD |
112 | struct ib_umad_port *port; |
113 | struct list_head recv_list; | |
2527e681 | 114 | struct list_head send_list; |
94382f35 RD |
115 | struct list_head port_list; |
116 | spinlock_t recv_lock; | |
2527e681 | 117 | spinlock_t send_lock; |
94382f35 RD |
118 | wait_queue_head_t recv_wait; |
119 | struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS]; | |
120 | int agents_dead; | |
1da177e4 LT |
121 | }; |
122 | ||
123 | struct ib_umad_packet { | |
cb183a06 | 124 | struct ib_mad_send_buf *msg; |
f36e1793 | 125 | struct ib_mad_recv_wc *recv_wc; |
1da177e4 | 126 | struct list_head list; |
cb183a06 | 127 | int length; |
cb183a06 | 128 | struct ib_user_mad mad; |
1da177e4 LT |
129 | }; |
130 | ||
a74968f8 RD |
131 | static struct class *umad_class; |
132 | ||
1da177e4 | 133 | static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE); |
a74968f8 RD |
134 | |
135 | static DEFINE_SPINLOCK(port_lock); | |
136 | static struct ib_umad_port *umad_port[IB_UMAD_MAX_PORTS]; | |
9a4b65e3 | 137 | static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS); |
1da177e4 LT |
138 | |
139 | static void ib_umad_add_one(struct ib_device *device); | |
140 | static void ib_umad_remove_one(struct ib_device *device); | |
141 | ||
a74968f8 RD |
142 | static void ib_umad_release_dev(struct kref *ref) |
143 | { | |
144 | struct ib_umad_device *dev = | |
145 | container_of(ref, struct ib_umad_device, ref); | |
146 | ||
147 | kfree(dev); | |
148 | } | |
149 | ||
94382f35 RD |
150 | /* caller must hold port->mutex at least for reading */ |
151 | static struct ib_mad_agent *__get_agent(struct ib_umad_file *file, int id) | |
152 | { | |
153 | return file->agents_dead ? NULL : file->agent[id]; | |
154 | } | |
155 | ||
1da177e4 LT |
156 | static int queue_packet(struct ib_umad_file *file, |
157 | struct ib_mad_agent *agent, | |
158 | struct ib_umad_packet *packet) | |
159 | { | |
160 | int ret = 1; | |
161 | ||
0c99cb6d | 162 | down_read(&file->port->mutex); |
94382f35 | 163 | |
cb183a06 HR |
164 | for (packet->mad.hdr.id = 0; |
165 | packet->mad.hdr.id < IB_UMAD_MAX_AGENTS; | |
166 | packet->mad.hdr.id++) | |
94382f35 | 167 | if (agent == __get_agent(file, packet->mad.hdr.id)) { |
1da177e4 LT |
168 | spin_lock_irq(&file->recv_lock); |
169 | list_add_tail(&packet->list, &file->recv_list); | |
170 | spin_unlock_irq(&file->recv_lock); | |
171 | wake_up_interruptible(&file->recv_wait); | |
172 | ret = 0; | |
173 | break; | |
174 | } | |
175 | ||
0c99cb6d | 176 | up_read(&file->port->mutex); |
1da177e4 LT |
177 | |
178 | return ret; | |
179 | } | |
180 | ||
2527e681 SH |
181 | static void dequeue_send(struct ib_umad_file *file, |
182 | struct ib_umad_packet *packet) | |
183 | { | |
184 | spin_lock_irq(&file->send_lock); | |
185 | list_del(&packet->list); | |
186 | spin_unlock_irq(&file->send_lock); | |
187 | } | |
188 | ||
1da177e4 LT |
189 | static void send_handler(struct ib_mad_agent *agent, |
190 | struct ib_mad_send_wc *send_wc) | |
191 | { | |
192 | struct ib_umad_file *file = agent->context; | |
34816ad9 | 193 | struct ib_umad_packet *packet = send_wc->send_buf->context[0]; |
1da177e4 | 194 | |
2527e681 | 195 | dequeue_send(file, packet); |
34816ad9 | 196 | ib_destroy_ah(packet->msg->ah); |
cb183a06 | 197 | ib_free_send_mad(packet->msg); |
1da177e4 LT |
198 | |
199 | if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) { | |
f36e1793 JM |
200 | packet->length = IB_MGMT_MAD_HDR; |
201 | packet->mad.hdr.status = ETIMEDOUT; | |
202 | if (!queue_packet(file, agent, packet)) | |
203 | return; | |
cb183a06 | 204 | } |
1da177e4 LT |
205 | kfree(packet); |
206 | } | |
207 | ||
208 | static void recv_handler(struct ib_mad_agent *agent, | |
209 | struct ib_mad_recv_wc *mad_recv_wc) | |
210 | { | |
211 | struct ib_umad_file *file = agent->context; | |
212 | struct ib_umad_packet *packet; | |
213 | ||
214 | if (mad_recv_wc->wc->status != IB_WC_SUCCESS) | |
f36e1793 | 215 | goto err1; |
1da177e4 | 216 | |
f36e1793 | 217 | packet = kzalloc(sizeof *packet, GFP_KERNEL); |
1da177e4 | 218 | if (!packet) |
f36e1793 | 219 | goto err1; |
1da177e4 | 220 | |
f36e1793 JM |
221 | packet->length = mad_recv_wc->mad_len; |
222 | packet->recv_wc = mad_recv_wc; | |
1da177e4 | 223 | |
cb183a06 | 224 | packet->mad.hdr.status = 0; |
f36e1793 JM |
225 | packet->mad.hdr.length = sizeof (struct ib_user_mad) + |
226 | mad_recv_wc->mad_len; | |
cb183a06 HR |
227 | packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp); |
228 | packet->mad.hdr.lid = cpu_to_be16(mad_recv_wc->wc->slid); | |
229 | packet->mad.hdr.sl = mad_recv_wc->wc->sl; | |
230 | packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits; | |
231 | packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH); | |
232 | if (packet->mad.hdr.grh_present) { | |
aeba84a9 SH |
233 | struct ib_ah_attr ah_attr; |
234 | ||
235 | ib_init_ah_from_wc(agent->device, agent->port_num, | |
236 | mad_recv_wc->wc, mad_recv_wc->recv_buf.grh, | |
237 | &ah_attr); | |
238 | ||
239 | packet->mad.hdr.gid_index = ah_attr.grh.sgid_index; | |
240 | packet->mad.hdr.hop_limit = ah_attr.grh.hop_limit; | |
241 | packet->mad.hdr.traffic_class = ah_attr.grh.traffic_class; | |
242 | memcpy(packet->mad.hdr.gid, &ah_attr.grh.dgid, 16); | |
243 | packet->mad.hdr.flow_label = cpu_to_be32(ah_attr.grh.flow_label); | |
1da177e4 LT |
244 | } |
245 | ||
246 | if (queue_packet(file, agent, packet)) | |
f36e1793 JM |
247 | goto err2; |
248 | return; | |
1da177e4 | 249 | |
f36e1793 JM |
250 | err2: |
251 | kfree(packet); | |
252 | err1: | |
1da177e4 LT |
253 | ib_free_recv_mad(mad_recv_wc); |
254 | } | |
255 | ||
f36e1793 JM |
256 | static ssize_t copy_recv_mad(char __user *buf, struct ib_umad_packet *packet, |
257 | size_t count) | |
258 | { | |
259 | struct ib_mad_recv_buf *recv_buf; | |
260 | int left, seg_payload, offset, max_seg_payload; | |
261 | ||
262 | /* We need enough room to copy the first (or only) MAD segment. */ | |
263 | recv_buf = &packet->recv_wc->recv_buf; | |
264 | if ((packet->length <= sizeof (*recv_buf->mad) && | |
265 | count < sizeof (packet->mad) + packet->length) || | |
266 | (packet->length > sizeof (*recv_buf->mad) && | |
267 | count < sizeof (packet->mad) + sizeof (*recv_buf->mad))) | |
268 | return -EINVAL; | |
269 | ||
270 | if (copy_to_user(buf, &packet->mad, sizeof (packet->mad))) | |
271 | return -EFAULT; | |
272 | ||
273 | buf += sizeof (packet->mad); | |
274 | seg_payload = min_t(int, packet->length, sizeof (*recv_buf->mad)); | |
275 | if (copy_to_user(buf, recv_buf->mad, seg_payload)) | |
276 | return -EFAULT; | |
277 | ||
278 | if (seg_payload < packet->length) { | |
279 | /* | |
280 | * Multipacket RMPP MAD message. Copy remainder of message. | |
281 | * Note that last segment may have a shorter payload. | |
282 | */ | |
283 | if (count < sizeof (packet->mad) + packet->length) { | |
284 | /* | |
285 | * The buffer is too small, return the first RMPP segment, | |
286 | * which includes the RMPP message length. | |
287 | */ | |
288 | return -ENOSPC; | |
289 | } | |
618a3c03 | 290 | offset = ib_get_mad_data_offset(recv_buf->mad->mad_hdr.mgmt_class); |
f36e1793 JM |
291 | max_seg_payload = sizeof (struct ib_mad) - offset; |
292 | ||
293 | for (left = packet->length - seg_payload, buf += seg_payload; | |
294 | left; left -= seg_payload, buf += seg_payload) { | |
295 | recv_buf = container_of(recv_buf->list.next, | |
296 | struct ib_mad_recv_buf, list); | |
297 | seg_payload = min(left, max_seg_payload); | |
298 | if (copy_to_user(buf, ((void *) recv_buf->mad) + offset, | |
299 | seg_payload)) | |
300 | return -EFAULT; | |
301 | } | |
302 | } | |
303 | return sizeof (packet->mad) + packet->length; | |
304 | } | |
305 | ||
306 | static ssize_t copy_send_mad(char __user *buf, struct ib_umad_packet *packet, | |
307 | size_t count) | |
308 | { | |
309 | ssize_t size = sizeof (packet->mad) + packet->length; | |
310 | ||
311 | if (count < size) | |
312 | return -EINVAL; | |
313 | ||
314 | if (copy_to_user(buf, &packet->mad, size)) | |
315 | return -EFAULT; | |
316 | ||
317 | return size; | |
318 | } | |
319 | ||
1da177e4 LT |
320 | static ssize_t ib_umad_read(struct file *filp, char __user *buf, |
321 | size_t count, loff_t *pos) | |
322 | { | |
323 | struct ib_umad_file *file = filp->private_data; | |
324 | struct ib_umad_packet *packet; | |
325 | ssize_t ret; | |
326 | ||
f36e1793 | 327 | if (count < sizeof (struct ib_user_mad)) |
1da177e4 LT |
328 | return -EINVAL; |
329 | ||
330 | spin_lock_irq(&file->recv_lock); | |
331 | ||
332 | while (list_empty(&file->recv_list)) { | |
333 | spin_unlock_irq(&file->recv_lock); | |
334 | ||
335 | if (filp->f_flags & O_NONBLOCK) | |
336 | return -EAGAIN; | |
337 | ||
338 | if (wait_event_interruptible(file->recv_wait, | |
339 | !list_empty(&file->recv_list))) | |
340 | return -ERESTARTSYS; | |
341 | ||
342 | spin_lock_irq(&file->recv_lock); | |
343 | } | |
344 | ||
345 | packet = list_entry(file->recv_list.next, struct ib_umad_packet, list); | |
346 | list_del(&packet->list); | |
347 | ||
348 | spin_unlock_irq(&file->recv_lock); | |
349 | ||
f36e1793 JM |
350 | if (packet->recv_wc) |
351 | ret = copy_recv_mad(buf, packet, count); | |
1da177e4 | 352 | else |
f36e1793 JM |
353 | ret = copy_send_mad(buf, packet, count); |
354 | ||
cb183a06 HR |
355 | if (ret < 0) { |
356 | /* Requeue packet */ | |
357 | spin_lock_irq(&file->recv_lock); | |
358 | list_add(&packet->list, &file->recv_list); | |
359 | spin_unlock_irq(&file->recv_lock); | |
f36e1793 JM |
360 | } else { |
361 | if (packet->recv_wc) | |
362 | ib_free_recv_mad(packet->recv_wc); | |
cb183a06 | 363 | kfree(packet); |
f36e1793 | 364 | } |
1da177e4 LT |
365 | return ret; |
366 | } | |
367 | ||
f36e1793 JM |
368 | static int copy_rmpp_mad(struct ib_mad_send_buf *msg, const char __user *buf) |
369 | { | |
370 | int left, seg; | |
371 | ||
372 | /* Copy class specific header */ | |
373 | if ((msg->hdr_len > IB_MGMT_RMPP_HDR) && | |
374 | copy_from_user(msg->mad + IB_MGMT_RMPP_HDR, buf + IB_MGMT_RMPP_HDR, | |
375 | msg->hdr_len - IB_MGMT_RMPP_HDR)) | |
376 | return -EFAULT; | |
377 | ||
378 | /* All headers are in place. Copy data segments. */ | |
379 | for (seg = 1, left = msg->data_len, buf += msg->hdr_len; left > 0; | |
380 | seg++, left -= msg->seg_size, buf += msg->seg_size) { | |
381 | if (copy_from_user(ib_get_rmpp_segment(msg, seg), buf, | |
382 | min(left, msg->seg_size))) | |
383 | return -EFAULT; | |
384 | } | |
385 | return 0; | |
386 | } | |
387 | ||
2527e681 SH |
388 | static int same_destination(struct ib_user_mad_hdr *hdr1, |
389 | struct ib_user_mad_hdr *hdr2) | |
390 | { | |
391 | if (!hdr1->grh_present && !hdr2->grh_present) | |
392 | return (hdr1->lid == hdr2->lid); | |
393 | ||
394 | if (hdr1->grh_present && hdr2->grh_present) | |
395 | return !memcmp(hdr1->gid, hdr2->gid, 16); | |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
400 | static int is_duplicate(struct ib_umad_file *file, | |
401 | struct ib_umad_packet *packet) | |
402 | { | |
403 | struct ib_umad_packet *sent_packet; | |
404 | struct ib_mad_hdr *sent_hdr, *hdr; | |
405 | ||
406 | hdr = (struct ib_mad_hdr *) packet->mad.data; | |
407 | list_for_each_entry(sent_packet, &file->send_list, list) { | |
408 | sent_hdr = (struct ib_mad_hdr *) sent_packet->mad.data; | |
409 | ||
410 | if ((hdr->tid != sent_hdr->tid) || | |
411 | (hdr->mgmt_class != sent_hdr->mgmt_class)) | |
412 | continue; | |
413 | ||
414 | /* | |
415 | * No need to be overly clever here. If two new operations have | |
416 | * the same TID, reject the second as a duplicate. This is more | |
417 | * restrictive than required by the spec. | |
418 | */ | |
419 | if (!ib_response_mad((struct ib_mad *) hdr)) { | |
420 | if (!ib_response_mad((struct ib_mad *) sent_hdr)) | |
421 | return 1; | |
422 | continue; | |
423 | } else if (!ib_response_mad((struct ib_mad *) sent_hdr)) | |
424 | continue; | |
425 | ||
426 | if (same_destination(&packet->mad.hdr, &sent_packet->mad.hdr)) | |
427 | return 1; | |
428 | } | |
429 | ||
430 | return 0; | |
431 | } | |
432 | ||
1da177e4 LT |
433 | static ssize_t ib_umad_write(struct file *filp, const char __user *buf, |
434 | size_t count, loff_t *pos) | |
435 | { | |
436 | struct ib_umad_file *file = filp->private_data; | |
437 | struct ib_umad_packet *packet; | |
438 | struct ib_mad_agent *agent; | |
439 | struct ib_ah_attr ah_attr; | |
34816ad9 | 440 | struct ib_ah *ah; |
cb183a06 | 441 | struct ib_rmpp_mad *rmpp_mad; |
97f52eb4 | 442 | __be64 *tid; |
f36e1793 | 443 | int ret, data_len, hdr_len, copy_offset, rmpp_active; |
1da177e4 | 444 | |
eabc7793 | 445 | if (count < sizeof (struct ib_user_mad) + IB_MGMT_RMPP_HDR) |
1da177e4 LT |
446 | return -EINVAL; |
447 | ||
f36e1793 | 448 | packet = kzalloc(sizeof *packet + IB_MGMT_RMPP_HDR, GFP_KERNEL); |
1da177e4 LT |
449 | if (!packet) |
450 | return -ENOMEM; | |
451 | ||
cb183a06 | 452 | if (copy_from_user(&packet->mad, buf, |
cb0f0910 | 453 | sizeof (struct ib_user_mad) + IB_MGMT_RMPP_HDR)) { |
cb183a06 HR |
454 | ret = -EFAULT; |
455 | goto err; | |
1da177e4 LT |
456 | } |
457 | ||
cb183a06 HR |
458 | if (packet->mad.hdr.id < 0 || |
459 | packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) { | |
1da177e4 LT |
460 | ret = -EINVAL; |
461 | goto err; | |
462 | } | |
463 | ||
0c99cb6d | 464 | down_read(&file->port->mutex); |
1da177e4 | 465 | |
94382f35 | 466 | agent = __get_agent(file, packet->mad.hdr.id); |
1da177e4 LT |
467 | if (!agent) { |
468 | ret = -EINVAL; | |
469 | goto err_up; | |
470 | } | |
471 | ||
1da177e4 | 472 | memset(&ah_attr, 0, sizeof ah_attr); |
cb183a06 HR |
473 | ah_attr.dlid = be16_to_cpu(packet->mad.hdr.lid); |
474 | ah_attr.sl = packet->mad.hdr.sl; | |
475 | ah_attr.src_path_bits = packet->mad.hdr.path_bits; | |
1da177e4 | 476 | ah_attr.port_num = file->port->port_num; |
cb183a06 | 477 | if (packet->mad.hdr.grh_present) { |
1da177e4 | 478 | ah_attr.ah_flags = IB_AH_GRH; |
cb183a06 | 479 | memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16); |
aeba84a9 | 480 | ah_attr.grh.sgid_index = packet->mad.hdr.gid_index; |
97f52eb4 | 481 | ah_attr.grh.flow_label = be32_to_cpu(packet->mad.hdr.flow_label); |
cb183a06 HR |
482 | ah_attr.grh.hop_limit = packet->mad.hdr.hop_limit; |
483 | ah_attr.grh.traffic_class = packet->mad.hdr.traffic_class; | |
1da177e4 LT |
484 | } |
485 | ||
34816ad9 SH |
486 | ah = ib_create_ah(agent->qp->pd, &ah_attr); |
487 | if (IS_ERR(ah)) { | |
488 | ret = PTR_ERR(ah); | |
1da177e4 LT |
489 | goto err_up; |
490 | } | |
491 | ||
cb183a06 | 492 | rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data; |
618a3c03 HR |
493 | hdr_len = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class); |
494 | if (!ib_is_mad_class_rmpp(rmpp_mad->mad_hdr.mgmt_class)) { | |
495 | copy_offset = IB_MGMT_MAD_HDR; | |
496 | rmpp_active = 0; | |
497 | } else { | |
f36e1793 JM |
498 | copy_offset = IB_MGMT_RMPP_HDR; |
499 | rmpp_active = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & | |
500 | IB_MGMT_RMPP_FLAG_ACTIVE; | |
cb183a06 HR |
501 | } |
502 | ||
f36e1793 | 503 | data_len = count - sizeof (struct ib_user_mad) - hdr_len; |
cb183a06 HR |
504 | packet->msg = ib_create_send_mad(agent, |
505 | be32_to_cpu(packet->mad.hdr.qpn), | |
f36e1793 JM |
506 | 0, rmpp_active, hdr_len, |
507 | data_len, GFP_KERNEL); | |
cb183a06 HR |
508 | if (IS_ERR(packet->msg)) { |
509 | ret = PTR_ERR(packet->msg); | |
510 | goto err_ah; | |
511 | } | |
1da177e4 | 512 | |
34816ad9 SH |
513 | packet->msg->ah = ah; |
514 | packet->msg->timeout_ms = packet->mad.hdr.timeout_ms; | |
515 | packet->msg->retries = packet->mad.hdr.retries; | |
516 | packet->msg->context[0] = packet; | |
1da177e4 | 517 | |
f36e1793 | 518 | /* Copy MAD header. Any RMPP header is already in place. */ |
cb0f0910 | 519 | memcpy(packet->msg->mad, packet->mad.data, IB_MGMT_MAD_HDR); |
f36e1793 JM |
520 | buf += sizeof (struct ib_user_mad); |
521 | ||
522 | if (!rmpp_active) { | |
523 | if (copy_from_user(packet->msg->mad + copy_offset, | |
524 | buf + copy_offset, | |
525 | hdr_len + data_len - copy_offset)) { | |
526 | ret = -EFAULT; | |
527 | goto err_msg; | |
528 | } | |
529 | } else { | |
530 | ret = copy_rmpp_mad(packet->msg, buf); | |
531 | if (ret) | |
532 | goto err_msg; | |
cb183a06 HR |
533 | } |
534 | ||
535 | /* | |
2527e681 SH |
536 | * Set the high-order part of the transaction ID to make MADs from |
537 | * different agents unique, and allow routing responses back to the | |
538 | * original requestor. | |
cb183a06 | 539 | */ |
2527e681 | 540 | if (!ib_response_mad(packet->msg->mad)) { |
089a1bed | 541 | tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid; |
cb183a06 HR |
542 | *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 | |
543 | (be64_to_cpup(tid) & 0xffffffff)); | |
2527e681 SH |
544 | rmpp_mad->mad_hdr.tid = *tid; |
545 | } | |
546 | ||
547 | spin_lock_irq(&file->send_lock); | |
548 | ret = is_duplicate(file, packet); | |
549 | if (!ret) | |
550 | list_add_tail(&packet->list, &file->send_list); | |
551 | spin_unlock_irq(&file->send_lock); | |
552 | if (ret) { | |
553 | ret = -EINVAL; | |
554 | goto err_msg; | |
1da177e4 LT |
555 | } |
556 | ||
34816ad9 | 557 | ret = ib_post_send_mad(packet->msg, NULL); |
cb183a06 | 558 | if (ret) |
2527e681 | 559 | goto err_send; |
cb183a06 | 560 | |
0c99cb6d | 561 | up_read(&file->port->mutex); |
cb0f0910 | 562 | return count; |
cb183a06 | 563 | |
2527e681 SH |
564 | err_send: |
565 | dequeue_send(file, packet); | |
cb183a06 HR |
566 | err_msg: |
567 | ib_free_send_mad(packet->msg); | |
cb183a06 | 568 | err_ah: |
34816ad9 | 569 | ib_destroy_ah(ah); |
1da177e4 | 570 | err_up: |
0c99cb6d | 571 | up_read(&file->port->mutex); |
1da177e4 LT |
572 | err: |
573 | kfree(packet); | |
574 | return ret; | |
575 | } | |
576 | ||
577 | static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait) | |
578 | { | |
579 | struct ib_umad_file *file = filp->private_data; | |
580 | ||
581 | /* we will always be able to post a MAD send */ | |
582 | unsigned int mask = POLLOUT | POLLWRNORM; | |
583 | ||
584 | poll_wait(filp, &file->recv_wait, wait); | |
585 | ||
586 | if (!list_empty(&file->recv_list)) | |
587 | mask |= POLLIN | POLLRDNORM; | |
588 | ||
589 | return mask; | |
590 | } | |
591 | ||
592 | static int ib_umad_reg_agent(struct ib_umad_file *file, unsigned long arg) | |
593 | { | |
594 | struct ib_user_mad_reg_req ureq; | |
595 | struct ib_mad_reg_req req; | |
596 | struct ib_mad_agent *agent; | |
597 | int agent_id; | |
598 | int ret; | |
599 | ||
0c99cb6d RD |
600 | down_write(&file->port->mutex); |
601 | ||
602 | if (!file->port->ib_dev) { | |
603 | ret = -EPIPE; | |
604 | goto out; | |
605 | } | |
1da177e4 LT |
606 | |
607 | if (copy_from_user(&ureq, (void __user *) arg, sizeof ureq)) { | |
608 | ret = -EFAULT; | |
609 | goto out; | |
610 | } | |
611 | ||
612 | if (ureq.qpn != 0 && ureq.qpn != 1) { | |
613 | ret = -EINVAL; | |
614 | goto out; | |
615 | } | |
616 | ||
617 | for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id) | |
94382f35 | 618 | if (!__get_agent(file, agent_id)) |
1da177e4 LT |
619 | goto found; |
620 | ||
621 | ret = -ENOMEM; | |
622 | goto out; | |
623 | ||
624 | found: | |
0df3bb13 RD |
625 | if (ureq.mgmt_class) { |
626 | req.mgmt_class = ureq.mgmt_class; | |
627 | req.mgmt_class_version = ureq.mgmt_class_version; | |
628 | memcpy(req.method_mask, ureq.method_mask, sizeof req.method_mask); | |
629 | memcpy(req.oui, ureq.oui, sizeof req.oui); | |
630 | } | |
1da177e4 LT |
631 | |
632 | agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num, | |
633 | ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI, | |
0df3bb13 | 634 | ureq.mgmt_class ? &req : NULL, |
cb183a06 HR |
635 | ureq.rmpp_version, |
636 | send_handler, recv_handler, file); | |
1da177e4 LT |
637 | if (IS_ERR(agent)) { |
638 | ret = PTR_ERR(agent); | |
639 | goto out; | |
640 | } | |
641 | ||
1da177e4 LT |
642 | if (put_user(agent_id, |
643 | (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) { | |
644 | ret = -EFAULT; | |
ec914c52 RD |
645 | ib_unregister_mad_agent(agent); |
646 | goto out; | |
1da177e4 LT |
647 | } |
648 | ||
2f76e829 | 649 | file->agent[agent_id] = agent; |
1da177e4 | 650 | ret = 0; |
2f76e829 | 651 | |
1da177e4 | 652 | out: |
0c99cb6d | 653 | up_write(&file->port->mutex); |
1da177e4 LT |
654 | return ret; |
655 | } | |
656 | ||
657 | static int ib_umad_unreg_agent(struct ib_umad_file *file, unsigned long arg) | |
658 | { | |
2f76e829 | 659 | struct ib_mad_agent *agent = NULL; |
1da177e4 LT |
660 | u32 id; |
661 | int ret = 0; | |
662 | ||
2f76e829 RD |
663 | if (get_user(id, (u32 __user *) arg)) |
664 | return -EFAULT; | |
1da177e4 | 665 | |
2f76e829 | 666 | down_write(&file->port->mutex); |
1da177e4 | 667 | |
94382f35 | 668 | if (id < 0 || id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) { |
1da177e4 LT |
669 | ret = -EINVAL; |
670 | goto out; | |
671 | } | |
672 | ||
2f76e829 | 673 | agent = file->agent[id]; |
1da177e4 LT |
674 | file->agent[id] = NULL; |
675 | ||
676 | out: | |
0c99cb6d | 677 | up_write(&file->port->mutex); |
2f76e829 | 678 | |
ec914c52 | 679 | if (agent) |
2f76e829 | 680 | ib_unregister_mad_agent(agent); |
2f76e829 | 681 | |
1da177e4 LT |
682 | return ret; |
683 | } | |
684 | ||
cb183a06 HR |
685 | static long ib_umad_ioctl(struct file *filp, unsigned int cmd, |
686 | unsigned long arg) | |
1da177e4 LT |
687 | { |
688 | switch (cmd) { | |
689 | case IB_USER_MAD_REGISTER_AGENT: | |
690 | return ib_umad_reg_agent(filp->private_data, arg); | |
691 | case IB_USER_MAD_UNREGISTER_AGENT: | |
692 | return ib_umad_unreg_agent(filp->private_data, arg); | |
693 | default: | |
694 | return -ENOIOCTLCMD; | |
695 | } | |
696 | } | |
697 | ||
698 | static int ib_umad_open(struct inode *inode, struct file *filp) | |
699 | { | |
a74968f8 | 700 | struct ib_umad_port *port; |
1da177e4 | 701 | struct ib_umad_file *file; |
0c99cb6d | 702 | int ret = 0; |
1da177e4 | 703 | |
a74968f8 RD |
704 | spin_lock(&port_lock); |
705 | port = umad_port[iminor(inode) - IB_UMAD_MINOR_BASE]; | |
706 | if (port) | |
707 | kref_get(&port->umad_dev->ref); | |
708 | spin_unlock(&port_lock); | |
709 | ||
710 | if (!port) | |
711 | return -ENXIO; | |
712 | ||
0c99cb6d RD |
713 | down_write(&port->mutex); |
714 | ||
715 | if (!port->ib_dev) { | |
716 | ret = -ENXIO; | |
717 | goto out; | |
718 | } | |
719 | ||
cb0f0910 | 720 | file = kzalloc(sizeof *file, GFP_KERNEL); |
a74968f8 RD |
721 | if (!file) { |
722 | kref_put(&port->umad_dev->ref, ib_umad_release_dev); | |
0c99cb6d RD |
723 | ret = -ENOMEM; |
724 | goto out; | |
a74968f8 | 725 | } |
1da177e4 | 726 | |
1da177e4 | 727 | spin_lock_init(&file->recv_lock); |
2527e681 | 728 | spin_lock_init(&file->send_lock); |
1da177e4 | 729 | INIT_LIST_HEAD(&file->recv_list); |
2527e681 | 730 | INIT_LIST_HEAD(&file->send_list); |
1da177e4 LT |
731 | init_waitqueue_head(&file->recv_wait); |
732 | ||
733 | file->port = port; | |
734 | filp->private_data = file; | |
735 | ||
0c99cb6d RD |
736 | list_add_tail(&file->port_list, &port->file_list); |
737 | ||
738 | out: | |
739 | up_write(&port->mutex); | |
740 | return ret; | |
1da177e4 LT |
741 | } |
742 | ||
743 | static int ib_umad_close(struct inode *inode, struct file *filp) | |
744 | { | |
745 | struct ib_umad_file *file = filp->private_data; | |
a74968f8 | 746 | struct ib_umad_device *dev = file->port->umad_dev; |
561e148e | 747 | struct ib_umad_packet *packet, *tmp; |
94382f35 | 748 | int already_dead; |
1da177e4 LT |
749 | int i; |
750 | ||
94382f35 RD |
751 | down_write(&file->port->mutex); |
752 | ||
753 | already_dead = file->agents_dead; | |
754 | file->agents_dead = 1; | |
1da177e4 | 755 | |
f36e1793 JM |
756 | list_for_each_entry_safe(packet, tmp, &file->recv_list, list) { |
757 | if (packet->recv_wc) | |
758 | ib_free_recv_mad(packet->recv_wc); | |
561e148e | 759 | kfree(packet); |
f36e1793 | 760 | } |
561e148e | 761 | |
0c99cb6d | 762 | list_del(&file->port_list); |
0c99cb6d | 763 | |
94382f35 RD |
764 | downgrade_write(&file->port->mutex); |
765 | ||
766 | if (!already_dead) | |
767 | for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i) | |
768 | if (file->agent[i]) | |
769 | ib_unregister_mad_agent(file->agent[i]); | |
1da177e4 | 770 | |
94382f35 RD |
771 | up_read(&file->port->mutex); |
772 | ||
773 | kfree(file); | |
a74968f8 RD |
774 | kref_put(&dev->ref, ib_umad_release_dev); |
775 | ||
1da177e4 LT |
776 | return 0; |
777 | } | |
778 | ||
2b8693c0 | 779 | static const struct file_operations umad_fops = { |
cb183a06 HR |
780 | .owner = THIS_MODULE, |
781 | .read = ib_umad_read, | |
782 | .write = ib_umad_write, | |
783 | .poll = ib_umad_poll, | |
1da177e4 | 784 | .unlocked_ioctl = ib_umad_ioctl, |
cb183a06 HR |
785 | .compat_ioctl = ib_umad_ioctl, |
786 | .open = ib_umad_open, | |
787 | .release = ib_umad_close | |
1da177e4 LT |
788 | }; |
789 | ||
790 | static int ib_umad_sm_open(struct inode *inode, struct file *filp) | |
791 | { | |
a74968f8 | 792 | struct ib_umad_port *port; |
1da177e4 LT |
793 | struct ib_port_modify props = { |
794 | .set_port_cap_mask = IB_PORT_SM | |
795 | }; | |
796 | int ret; | |
797 | ||
a74968f8 RD |
798 | spin_lock(&port_lock); |
799 | port = umad_port[iminor(inode) - IB_UMAD_MINOR_BASE - IB_UMAD_MAX_PORTS]; | |
800 | if (port) | |
801 | kref_get(&port->umad_dev->ref); | |
802 | spin_unlock(&port_lock); | |
803 | ||
804 | if (!port) | |
805 | return -ENXIO; | |
806 | ||
1da177e4 | 807 | if (filp->f_flags & O_NONBLOCK) { |
a74968f8 RD |
808 | if (down_trylock(&port->sm_sem)) { |
809 | ret = -EAGAIN; | |
810 | goto fail; | |
811 | } | |
1da177e4 | 812 | } else { |
a74968f8 RD |
813 | if (down_interruptible(&port->sm_sem)) { |
814 | ret = -ERESTARTSYS; | |
815 | goto fail; | |
816 | } | |
1da177e4 LT |
817 | } |
818 | ||
819 | ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props); | |
820 | if (ret) { | |
821 | up(&port->sm_sem); | |
a74968f8 | 822 | goto fail; |
1da177e4 LT |
823 | } |
824 | ||
825 | filp->private_data = port; | |
826 | ||
827 | return 0; | |
a74968f8 RD |
828 | |
829 | fail: | |
830 | kref_put(&port->umad_dev->ref, ib_umad_release_dev); | |
831 | return ret; | |
1da177e4 LT |
832 | } |
833 | ||
834 | static int ib_umad_sm_close(struct inode *inode, struct file *filp) | |
835 | { | |
836 | struct ib_umad_port *port = filp->private_data; | |
837 | struct ib_port_modify props = { | |
838 | .clr_port_cap_mask = IB_PORT_SM | |
839 | }; | |
0c99cb6d RD |
840 | int ret = 0; |
841 | ||
842 | down_write(&port->mutex); | |
843 | if (port->ib_dev) | |
844 | ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props); | |
845 | up_write(&port->mutex); | |
1da177e4 | 846 | |
1da177e4 LT |
847 | up(&port->sm_sem); |
848 | ||
a74968f8 RD |
849 | kref_put(&port->umad_dev->ref, ib_umad_release_dev); |
850 | ||
1da177e4 LT |
851 | return ret; |
852 | } | |
853 | ||
2b8693c0 | 854 | static const struct file_operations umad_sm_fops = { |
1da177e4 LT |
855 | .owner = THIS_MODULE, |
856 | .open = ib_umad_sm_open, | |
857 | .release = ib_umad_sm_close | |
858 | }; | |
859 | ||
860 | static struct ib_client umad_client = { | |
861 | .name = "umad", | |
862 | .add = ib_umad_add_one, | |
863 | .remove = ib_umad_remove_one | |
864 | }; | |
865 | ||
1da177e4 LT |
866 | static ssize_t show_ibdev(struct class_device *class_dev, char *buf) |
867 | { | |
868 | struct ib_umad_port *port = class_get_devdata(class_dev); | |
869 | ||
a74968f8 RD |
870 | if (!port) |
871 | return -ENODEV; | |
872 | ||
1da177e4 LT |
873 | return sprintf(buf, "%s\n", port->ib_dev->name); |
874 | } | |
875 | static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); | |
876 | ||
877 | static ssize_t show_port(struct class_device *class_dev, char *buf) | |
878 | { | |
879 | struct ib_umad_port *port = class_get_devdata(class_dev); | |
880 | ||
a74968f8 RD |
881 | if (!port) |
882 | return -ENODEV; | |
883 | ||
1da177e4 LT |
884 | return sprintf(buf, "%d\n", port->port_num); |
885 | } | |
886 | static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL); | |
887 | ||
1da177e4 LT |
888 | static ssize_t show_abi_version(struct class *class, char *buf) |
889 | { | |
890 | return sprintf(buf, "%d\n", IB_USER_MAD_ABI_VERSION); | |
891 | } | |
892 | static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL); | |
893 | ||
894 | static int ib_umad_init_port(struct ib_device *device, int port_num, | |
895 | struct ib_umad_port *port) | |
896 | { | |
a74968f8 RD |
897 | spin_lock(&port_lock); |
898 | port->dev_num = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS); | |
899 | if (port->dev_num >= IB_UMAD_MAX_PORTS) { | |
900 | spin_unlock(&port_lock); | |
1da177e4 LT |
901 | return -1; |
902 | } | |
a74968f8 RD |
903 | set_bit(port->dev_num, dev_map); |
904 | spin_unlock(&port_lock); | |
1da177e4 LT |
905 | |
906 | port->ib_dev = device; | |
907 | port->port_num = port_num; | |
908 | init_MUTEX(&port->sm_sem); | |
0c99cb6d RD |
909 | init_rwsem(&port->mutex); |
910 | INIT_LIST_HEAD(&port->file_list); | |
1da177e4 | 911 | |
a74968f8 RD |
912 | port->dev = cdev_alloc(); |
913 | if (!port->dev) | |
1da177e4 | 914 | return -1; |
a74968f8 RD |
915 | port->dev->owner = THIS_MODULE; |
916 | port->dev->ops = &umad_fops; | |
917 | kobject_set_name(&port->dev->kobj, "umad%d", port->dev_num); | |
918 | if (cdev_add(port->dev, base_dev + port->dev_num, 1)) | |
1da177e4 LT |
919 | goto err_cdev; |
920 | ||
4cce3390 | 921 | port->class_dev = class_device_create(umad_class, NULL, port->dev->dev, |
a74968f8 RD |
922 | device->dma_device, |
923 | "umad%d", port->dev_num); | |
924 | if (IS_ERR(port->class_dev)) | |
925 | goto err_cdev; | |
1da177e4 | 926 | |
a74968f8 | 927 | if (class_device_create_file(port->class_dev, &class_device_attr_ibdev)) |
1da177e4 | 928 | goto err_class; |
a74968f8 | 929 | if (class_device_create_file(port->class_dev, &class_device_attr_port)) |
1da177e4 LT |
930 | goto err_class; |
931 | ||
a74968f8 RD |
932 | port->sm_dev = cdev_alloc(); |
933 | if (!port->sm_dev) | |
934 | goto err_class; | |
935 | port->sm_dev->owner = THIS_MODULE; | |
936 | port->sm_dev->ops = &umad_sm_fops; | |
8b37b947 | 937 | kobject_set_name(&port->sm_dev->kobj, "issm%d", port->dev_num); |
a74968f8 RD |
938 | if (cdev_add(port->sm_dev, base_dev + port->dev_num + IB_UMAD_MAX_PORTS, 1)) |
939 | goto err_sm_cdev; | |
1da177e4 | 940 | |
4cce3390 | 941 | port->sm_class_dev = class_device_create(umad_class, NULL, port->sm_dev->dev, |
a74968f8 RD |
942 | device->dma_device, |
943 | "issm%d", port->dev_num); | |
944 | if (IS_ERR(port->sm_class_dev)) | |
1da177e4 LT |
945 | goto err_sm_cdev; |
946 | ||
a74968f8 RD |
947 | class_set_devdata(port->class_dev, port); |
948 | class_set_devdata(port->sm_class_dev, port); | |
1da177e4 | 949 | |
a74968f8 | 950 | if (class_device_create_file(port->sm_class_dev, &class_device_attr_ibdev)) |
1da177e4 | 951 | goto err_sm_class; |
a74968f8 | 952 | if (class_device_create_file(port->sm_class_dev, &class_device_attr_port)) |
1da177e4 LT |
953 | goto err_sm_class; |
954 | ||
a74968f8 RD |
955 | spin_lock(&port_lock); |
956 | umad_port[port->dev_num] = port; | |
957 | spin_unlock(&port_lock); | |
958 | ||
1da177e4 LT |
959 | return 0; |
960 | ||
961 | err_sm_class: | |
a74968f8 | 962 | class_device_destroy(umad_class, port->sm_dev->dev); |
1da177e4 LT |
963 | |
964 | err_sm_cdev: | |
a74968f8 | 965 | cdev_del(port->sm_dev); |
1da177e4 LT |
966 | |
967 | err_class: | |
a74968f8 | 968 | class_device_destroy(umad_class, port->dev->dev); |
1da177e4 LT |
969 | |
970 | err_cdev: | |
a74968f8 RD |
971 | cdev_del(port->dev); |
972 | clear_bit(port->dev_num, dev_map); | |
1da177e4 LT |
973 | |
974 | return -1; | |
975 | } | |
976 | ||
a74968f8 RD |
977 | static void ib_umad_kill_port(struct ib_umad_port *port) |
978 | { | |
0c99cb6d RD |
979 | struct ib_umad_file *file; |
980 | int id; | |
981 | ||
a74968f8 RD |
982 | class_set_devdata(port->class_dev, NULL); |
983 | class_set_devdata(port->sm_class_dev, NULL); | |
984 | ||
985 | class_device_destroy(umad_class, port->dev->dev); | |
986 | class_device_destroy(umad_class, port->sm_dev->dev); | |
987 | ||
988 | cdev_del(port->dev); | |
989 | cdev_del(port->sm_dev); | |
990 | ||
991 | spin_lock(&port_lock); | |
992 | umad_port[port->dev_num] = NULL; | |
993 | spin_unlock(&port_lock); | |
994 | ||
0c99cb6d RD |
995 | down_write(&port->mutex); |
996 | ||
997 | port->ib_dev = NULL; | |
998 | ||
94382f35 RD |
999 | /* |
1000 | * Now go through the list of files attached to this port and | |
1001 | * unregister all of their MAD agents. We need to hold | |
1002 | * port->mutex while doing this to avoid racing with | |
1003 | * ib_umad_close(), but we can't hold the mutex for writing | |
1004 | * while calling ib_unregister_mad_agent(), since that might | |
1005 | * deadlock by calling back into queue_packet(). So we | |
1006 | * downgrade our lock to a read lock, and then drop and | |
1007 | * reacquire the write lock for the next iteration. | |
1008 | * | |
1009 | * We do list_del_init() on the file's list_head so that the | |
1010 | * list_del in ib_umad_close() is still OK, even after the | |
1011 | * file is removed from the list. | |
1012 | */ | |
1013 | while (!list_empty(&port->file_list)) { | |
1014 | file = list_entry(port->file_list.next, struct ib_umad_file, | |
1015 | port_list); | |
1016 | ||
1017 | file->agents_dead = 1; | |
1018 | list_del_init(&file->port_list); | |
1019 | ||
1020 | downgrade_write(&port->mutex); | |
1021 | ||
1022 | for (id = 0; id < IB_UMAD_MAX_AGENTS; ++id) | |
1023 | if (file->agent[id]) | |
1024 | ib_unregister_mad_agent(file->agent[id]); | |
1025 | ||
1026 | up_read(&port->mutex); | |
1027 | down_write(&port->mutex); | |
1028 | } | |
0c99cb6d RD |
1029 | |
1030 | up_write(&port->mutex); | |
1031 | ||
a74968f8 RD |
1032 | clear_bit(port->dev_num, dev_map); |
1033 | } | |
1034 | ||
1da177e4 LT |
1035 | static void ib_umad_add_one(struct ib_device *device) |
1036 | { | |
1037 | struct ib_umad_device *umad_dev; | |
1038 | int s, e, i; | |
1039 | ||
07ebafba TT |
1040 | if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) |
1041 | return; | |
1042 | ||
1043 | if (device->node_type == RDMA_NODE_IB_SWITCH) | |
1da177e4 LT |
1044 | s = e = 0; |
1045 | else { | |
1046 | s = 1; | |
1047 | e = device->phys_port_cnt; | |
1048 | } | |
1049 | ||
cb0f0910 | 1050 | umad_dev = kzalloc(sizeof *umad_dev + |
1da177e4 LT |
1051 | (e - s + 1) * sizeof (struct ib_umad_port), |
1052 | GFP_KERNEL); | |
1053 | if (!umad_dev) | |
1054 | return; | |
1055 | ||
1da177e4 LT |
1056 | kref_init(&umad_dev->ref); |
1057 | ||
1058 | umad_dev->start_port = s; | |
1059 | umad_dev->end_port = e; | |
1060 | ||
1061 | for (i = s; i <= e; ++i) { | |
1062 | umad_dev->port[i - s].umad_dev = umad_dev; | |
1063 | ||
1064 | if (ib_umad_init_port(device, i, &umad_dev->port[i - s])) | |
1065 | goto err; | |
1066 | } | |
1067 | ||
1068 | ib_set_client_data(device, &umad_client, umad_dev); | |
1069 | ||
1070 | return; | |
1071 | ||
1072 | err: | |
a74968f8 | 1073 | while (--i >= s) |
8b37b947 | 1074 | ib_umad_kill_port(&umad_dev->port[i - s]); |
1da177e4 LT |
1075 | |
1076 | kref_put(&umad_dev->ref, ib_umad_release_dev); | |
1077 | } | |
1078 | ||
1079 | static void ib_umad_remove_one(struct ib_device *device) | |
1080 | { | |
1081 | struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client); | |
1082 | int i; | |
1083 | ||
1084 | if (!umad_dev) | |
1085 | return; | |
1086 | ||
a74968f8 RD |
1087 | for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i) |
1088 | ib_umad_kill_port(&umad_dev->port[i]); | |
1da177e4 LT |
1089 | |
1090 | kref_put(&umad_dev->ref, ib_umad_release_dev); | |
1091 | } | |
1092 | ||
1093 | static int __init ib_umad_init(void) | |
1094 | { | |
1095 | int ret; | |
1096 | ||
1da177e4 LT |
1097 | ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2, |
1098 | "infiniband_mad"); | |
1099 | if (ret) { | |
1100 | printk(KERN_ERR "user_mad: couldn't register device number\n"); | |
1101 | goto out; | |
1102 | } | |
1103 | ||
a74968f8 RD |
1104 | umad_class = class_create(THIS_MODULE, "infiniband_mad"); |
1105 | if (IS_ERR(umad_class)) { | |
1106 | ret = PTR_ERR(umad_class); | |
1da177e4 LT |
1107 | printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n"); |
1108 | goto out_chrdev; | |
1109 | } | |
1110 | ||
a74968f8 | 1111 | ret = class_create_file(umad_class, &class_attr_abi_version); |
1da177e4 LT |
1112 | if (ret) { |
1113 | printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n"); | |
1114 | goto out_class; | |
1115 | } | |
1116 | ||
1117 | ret = ib_register_client(&umad_client); | |
1118 | if (ret) { | |
1119 | printk(KERN_ERR "user_mad: couldn't register ib_umad client\n"); | |
1120 | goto out_class; | |
1121 | } | |
1122 | ||
1123 | return 0; | |
1124 | ||
1125 | out_class: | |
a74968f8 | 1126 | class_destroy(umad_class); |
1da177e4 LT |
1127 | |
1128 | out_chrdev: | |
1129 | unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2); | |
1130 | ||
1131 | out: | |
1132 | return ret; | |
1133 | } | |
1134 | ||
1135 | static void __exit ib_umad_cleanup(void) | |
1136 | { | |
1137 | ib_unregister_client(&umad_client); | |
a74968f8 | 1138 | class_destroy(umad_class); |
1da177e4 LT |
1139 | unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2); |
1140 | } | |
1141 | ||
1142 | module_init(ib_umad_init); | |
1143 | module_exit(ib_umad_cleanup); |