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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2004 Topspin Communications. All rights reserved. | |
2a1d9b7f | 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 | * | |
cb183a06 | 34 | * $Id: user_mad.c 2814 2005-07-06 19:14:09Z halr $ |
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> | |
43 | #include <linux/pci.h> | |
44 | #include <linux/dma-mapping.h> | |
45 | #include <linux/poll.h> | |
46 | #include <linux/rwsem.h> | |
47 | #include <linux/kref.h> | |
48 | ||
49 | #include <asm/uaccess.h> | |
50 | #include <asm/semaphore.h> | |
51 | ||
a4d61e84 RD |
52 | #include <rdma/ib_mad.h> |
53 | #include <rdma/ib_user_mad.h> | |
1da177e4 LT |
54 | |
55 | MODULE_AUTHOR("Roland Dreier"); | |
56 | MODULE_DESCRIPTION("InfiniBand userspace MAD packet access"); | |
57 | MODULE_LICENSE("Dual BSD/GPL"); | |
58 | ||
59 | enum { | |
60 | IB_UMAD_MAX_PORTS = 64, | |
61 | IB_UMAD_MAX_AGENTS = 32, | |
62 | ||
63 | IB_UMAD_MAJOR = 231, | |
64 | IB_UMAD_MINOR_BASE = 0 | |
65 | }; | |
66 | ||
67 | struct ib_umad_port { | |
68 | int devnum; | |
69 | struct cdev dev; | |
70 | struct class_device class_dev; | |
71 | ||
72 | int sm_devnum; | |
73 | struct cdev sm_dev; | |
74 | struct class_device sm_class_dev; | |
75 | struct semaphore sm_sem; | |
76 | ||
77 | struct ib_device *ib_dev; | |
78 | struct ib_umad_device *umad_dev; | |
79 | u8 port_num; | |
80 | }; | |
81 | ||
82 | struct ib_umad_device { | |
83 | int start_port, end_port; | |
84 | struct kref ref; | |
85 | struct ib_umad_port port[0]; | |
86 | }; | |
87 | ||
88 | struct ib_umad_file { | |
89 | struct ib_umad_port *port; | |
90 | spinlock_t recv_lock; | |
91 | struct list_head recv_list; | |
92 | wait_queue_head_t recv_wait; | |
93 | struct rw_semaphore agent_mutex; | |
94 | struct ib_mad_agent *agent[IB_UMAD_MAX_AGENTS]; | |
95 | struct ib_mr *mr[IB_UMAD_MAX_AGENTS]; | |
96 | }; | |
97 | ||
98 | struct ib_umad_packet { | |
cb183a06 | 99 | struct ib_mad_send_buf *msg; |
1da177e4 | 100 | struct list_head list; |
cb183a06 | 101 | int length; |
1da177e4 | 102 | DECLARE_PCI_UNMAP_ADDR(mapping) |
cb183a06 | 103 | struct ib_user_mad mad; |
1da177e4 LT |
104 | }; |
105 | ||
106 | static const dev_t base_dev = MKDEV(IB_UMAD_MAJOR, IB_UMAD_MINOR_BASE); | |
107 | static spinlock_t map_lock; | |
108 | static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS * 2); | |
109 | ||
110 | static void ib_umad_add_one(struct ib_device *device); | |
111 | static void ib_umad_remove_one(struct ib_device *device); | |
112 | ||
113 | static int queue_packet(struct ib_umad_file *file, | |
114 | struct ib_mad_agent *agent, | |
115 | struct ib_umad_packet *packet) | |
116 | { | |
117 | int ret = 1; | |
118 | ||
119 | down_read(&file->agent_mutex); | |
cb183a06 HR |
120 | for (packet->mad.hdr.id = 0; |
121 | packet->mad.hdr.id < IB_UMAD_MAX_AGENTS; | |
122 | packet->mad.hdr.id++) | |
123 | if (agent == file->agent[packet->mad.hdr.id]) { | |
1da177e4 LT |
124 | spin_lock_irq(&file->recv_lock); |
125 | list_add_tail(&packet->list, &file->recv_list); | |
126 | spin_unlock_irq(&file->recv_lock); | |
127 | wake_up_interruptible(&file->recv_wait); | |
128 | ret = 0; | |
129 | break; | |
130 | } | |
131 | ||
132 | up_read(&file->agent_mutex); | |
133 | ||
134 | return ret; | |
135 | } | |
136 | ||
137 | static void send_handler(struct ib_mad_agent *agent, | |
138 | struct ib_mad_send_wc *send_wc) | |
139 | { | |
140 | struct ib_umad_file *file = agent->context; | |
34816ad9 SH |
141 | struct ib_umad_packet *timeout; |
142 | struct ib_umad_packet *packet = send_wc->send_buf->context[0]; | |
1da177e4 | 143 | |
34816ad9 | 144 | ib_destroy_ah(packet->msg->ah); |
cb183a06 | 145 | ib_free_send_mad(packet->msg); |
1da177e4 LT |
146 | |
147 | if (send_wc->status == IB_WC_RESP_TIMEOUT_ERR) { | |
cb183a06 HR |
148 | timeout = kmalloc(sizeof *timeout + sizeof (struct ib_mad_hdr), |
149 | GFP_KERNEL); | |
150 | if (!timeout) | |
151 | goto out; | |
1da177e4 | 152 | |
cb183a06 | 153 | memset(timeout, 0, sizeof *timeout + sizeof (struct ib_mad_hdr)); |
1da177e4 | 154 | |
cb183a06 HR |
155 | timeout->length = sizeof (struct ib_mad_hdr); |
156 | timeout->mad.hdr.id = packet->mad.hdr.id; | |
157 | timeout->mad.hdr.status = ETIMEDOUT; | |
158 | memcpy(timeout->mad.data, packet->mad.data, | |
159 | sizeof (struct ib_mad_hdr)); | |
160 | ||
161 | if (!queue_packet(file, agent, timeout)) | |
162 | return; | |
163 | } | |
164 | out: | |
1da177e4 LT |
165 | kfree(packet); |
166 | } | |
167 | ||
168 | static void recv_handler(struct ib_mad_agent *agent, | |
169 | struct ib_mad_recv_wc *mad_recv_wc) | |
170 | { | |
171 | struct ib_umad_file *file = agent->context; | |
172 | struct ib_umad_packet *packet; | |
cb183a06 | 173 | int length; |
1da177e4 LT |
174 | |
175 | if (mad_recv_wc->wc->status != IB_WC_SUCCESS) | |
176 | goto out; | |
177 | ||
cb183a06 HR |
178 | length = mad_recv_wc->mad_len; |
179 | packet = kmalloc(sizeof *packet + length, GFP_KERNEL); | |
1da177e4 LT |
180 | if (!packet) |
181 | goto out; | |
182 | ||
cb183a06 HR |
183 | memset(packet, 0, sizeof *packet + length); |
184 | packet->length = length; | |
185 | ||
186 | ib_coalesce_recv_mad(mad_recv_wc, packet->mad.data); | |
1da177e4 | 187 | |
cb183a06 HR |
188 | packet->mad.hdr.status = 0; |
189 | packet->mad.hdr.length = length + sizeof (struct ib_user_mad); | |
190 | packet->mad.hdr.qpn = cpu_to_be32(mad_recv_wc->wc->src_qp); | |
191 | packet->mad.hdr.lid = cpu_to_be16(mad_recv_wc->wc->slid); | |
192 | packet->mad.hdr.sl = mad_recv_wc->wc->sl; | |
193 | packet->mad.hdr.path_bits = mad_recv_wc->wc->dlid_path_bits; | |
194 | packet->mad.hdr.grh_present = !!(mad_recv_wc->wc->wc_flags & IB_WC_GRH); | |
195 | if (packet->mad.hdr.grh_present) { | |
1da177e4 | 196 | /* XXX parse GRH */ |
cb183a06 HR |
197 | packet->mad.hdr.gid_index = 0; |
198 | packet->mad.hdr.hop_limit = 0; | |
199 | packet->mad.hdr.traffic_class = 0; | |
200 | memset(packet->mad.hdr.gid, 0, 16); | |
201 | packet->mad.hdr.flow_label = 0; | |
1da177e4 LT |
202 | } |
203 | ||
204 | if (queue_packet(file, agent, packet)) | |
205 | kfree(packet); | |
206 | ||
207 | out: | |
208 | ib_free_recv_mad(mad_recv_wc); | |
209 | } | |
210 | ||
211 | static ssize_t ib_umad_read(struct file *filp, char __user *buf, | |
212 | size_t count, loff_t *pos) | |
213 | { | |
214 | struct ib_umad_file *file = filp->private_data; | |
215 | struct ib_umad_packet *packet; | |
216 | ssize_t ret; | |
217 | ||
cb183a06 | 218 | if (count < sizeof (struct ib_user_mad) + sizeof (struct ib_mad)) |
1da177e4 LT |
219 | return -EINVAL; |
220 | ||
221 | spin_lock_irq(&file->recv_lock); | |
222 | ||
223 | while (list_empty(&file->recv_list)) { | |
224 | spin_unlock_irq(&file->recv_lock); | |
225 | ||
226 | if (filp->f_flags & O_NONBLOCK) | |
227 | return -EAGAIN; | |
228 | ||
229 | if (wait_event_interruptible(file->recv_wait, | |
230 | !list_empty(&file->recv_list))) | |
231 | return -ERESTARTSYS; | |
232 | ||
233 | spin_lock_irq(&file->recv_lock); | |
234 | } | |
235 | ||
236 | packet = list_entry(file->recv_list.next, struct ib_umad_packet, list); | |
237 | list_del(&packet->list); | |
238 | ||
239 | spin_unlock_irq(&file->recv_lock); | |
240 | ||
cb183a06 HR |
241 | if (count < packet->length + sizeof (struct ib_user_mad)) { |
242 | /* Return length needed (and first RMPP segment) if too small */ | |
243 | if (copy_to_user(buf, &packet->mad, | |
244 | sizeof (struct ib_user_mad) + sizeof (struct ib_mad))) | |
245 | ret = -EFAULT; | |
246 | else | |
247 | ret = -ENOSPC; | |
248 | } else if (copy_to_user(buf, &packet->mad, | |
249 | packet->length + sizeof (struct ib_user_mad))) | |
1da177e4 LT |
250 | ret = -EFAULT; |
251 | else | |
cb183a06 HR |
252 | ret = packet->length + sizeof (struct ib_user_mad); |
253 | if (ret < 0) { | |
254 | /* Requeue packet */ | |
255 | spin_lock_irq(&file->recv_lock); | |
256 | list_add(&packet->list, &file->recv_list); | |
257 | spin_unlock_irq(&file->recv_lock); | |
258 | } else | |
259 | kfree(packet); | |
1da177e4 LT |
260 | return ret; |
261 | } | |
262 | ||
263 | static ssize_t ib_umad_write(struct file *filp, const char __user *buf, | |
264 | size_t count, loff_t *pos) | |
265 | { | |
266 | struct ib_umad_file *file = filp->private_data; | |
267 | struct ib_umad_packet *packet; | |
268 | struct ib_mad_agent *agent; | |
269 | struct ib_ah_attr ah_attr; | |
34816ad9 | 270 | struct ib_ah *ah; |
cb183a06 | 271 | struct ib_rmpp_mad *rmpp_mad; |
1da177e4 | 272 | u8 method; |
97f52eb4 | 273 | __be64 *tid; |
34816ad9 | 274 | int ret, length, hdr_len, rmpp_hdr_size; |
cb183a06 | 275 | int rmpp_active = 0; |
1da177e4 LT |
276 | |
277 | if (count < sizeof (struct ib_user_mad)) | |
278 | return -EINVAL; | |
279 | ||
cb183a06 HR |
280 | length = count - sizeof (struct ib_user_mad); |
281 | packet = kmalloc(sizeof *packet + sizeof(struct ib_mad_hdr) + | |
2e0c512a | 282 | sizeof (struct ib_rmpp_hdr), GFP_KERNEL); |
1da177e4 LT |
283 | if (!packet) |
284 | return -ENOMEM; | |
285 | ||
cb183a06 HR |
286 | if (copy_from_user(&packet->mad, buf, |
287 | sizeof (struct ib_user_mad) + | |
2e0c512a RD |
288 | sizeof (struct ib_mad_hdr) + |
289 | sizeof (struct ib_rmpp_hdr))) { | |
cb183a06 HR |
290 | ret = -EFAULT; |
291 | goto err; | |
1da177e4 LT |
292 | } |
293 | ||
cb183a06 HR |
294 | if (packet->mad.hdr.id < 0 || |
295 | packet->mad.hdr.id >= IB_UMAD_MAX_AGENTS) { | |
1da177e4 LT |
296 | ret = -EINVAL; |
297 | goto err; | |
298 | } | |
299 | ||
cb183a06 HR |
300 | packet->length = length; |
301 | ||
1da177e4 LT |
302 | down_read(&file->agent_mutex); |
303 | ||
cb183a06 | 304 | agent = file->agent[packet->mad.hdr.id]; |
1da177e4 LT |
305 | if (!agent) { |
306 | ret = -EINVAL; | |
307 | goto err_up; | |
308 | } | |
309 | ||
1da177e4 | 310 | memset(&ah_attr, 0, sizeof ah_attr); |
cb183a06 HR |
311 | ah_attr.dlid = be16_to_cpu(packet->mad.hdr.lid); |
312 | ah_attr.sl = packet->mad.hdr.sl; | |
313 | ah_attr.src_path_bits = packet->mad.hdr.path_bits; | |
1da177e4 | 314 | ah_attr.port_num = file->port->port_num; |
cb183a06 | 315 | if (packet->mad.hdr.grh_present) { |
1da177e4 | 316 | ah_attr.ah_flags = IB_AH_GRH; |
cb183a06 | 317 | memcpy(ah_attr.grh.dgid.raw, packet->mad.hdr.gid, 16); |
97f52eb4 | 318 | ah_attr.grh.flow_label = be32_to_cpu(packet->mad.hdr.flow_label); |
cb183a06 HR |
319 | ah_attr.grh.hop_limit = packet->mad.hdr.hop_limit; |
320 | ah_attr.grh.traffic_class = packet->mad.hdr.traffic_class; | |
1da177e4 LT |
321 | } |
322 | ||
34816ad9 SH |
323 | ah = ib_create_ah(agent->qp->pd, &ah_attr); |
324 | if (IS_ERR(ah)) { | |
325 | ret = PTR_ERR(ah); | |
1da177e4 LT |
326 | goto err_up; |
327 | } | |
328 | ||
cb183a06 HR |
329 | rmpp_mad = (struct ib_rmpp_mad *) packet->mad.data; |
330 | if (ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_ACTIVE) { | |
331 | /* RMPP active */ | |
332 | if (!agent->rmpp_version) { | |
333 | ret = -EINVAL; | |
334 | goto err_ah; | |
335 | } | |
eff4c654 HR |
336 | |
337 | /* Validate that the management class can support RMPP */ | |
cb183a06 | 338 | if (rmpp_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_ADM) { |
34816ad9 | 339 | hdr_len = IB_MGMT_SA_HDR; |
cb183a06 HR |
340 | } else if ((rmpp_mad->mad_hdr.mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) && |
341 | (rmpp_mad->mad_hdr.mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)) { | |
34816ad9 | 342 | hdr_len = IB_MGMT_VENDOR_HDR; |
cb183a06 HR |
343 | } else { |
344 | ret = -EINVAL; | |
345 | goto err_ah; | |
346 | } | |
347 | rmpp_active = 1; | |
348 | } else { | |
2e0c512a | 349 | if (length > sizeof (struct ib_mad)) { |
cb183a06 HR |
350 | ret = -EINVAL; |
351 | goto err_ah; | |
352 | } | |
34816ad9 | 353 | hdr_len = IB_MGMT_MAD_HDR; |
cb183a06 HR |
354 | } |
355 | ||
356 | packet->msg = ib_create_send_mad(agent, | |
357 | be32_to_cpu(packet->mad.hdr.qpn), | |
34816ad9 SH |
358 | 0, rmpp_active, |
359 | hdr_len, length - hdr_len, | |
cb183a06 HR |
360 | GFP_KERNEL); |
361 | if (IS_ERR(packet->msg)) { | |
362 | ret = PTR_ERR(packet->msg); | |
363 | goto err_ah; | |
364 | } | |
1da177e4 | 365 | |
34816ad9 SH |
366 | packet->msg->ah = ah; |
367 | packet->msg->timeout_ms = packet->mad.hdr.timeout_ms; | |
368 | packet->msg->retries = packet->mad.hdr.retries; | |
369 | packet->msg->context[0] = packet; | |
1da177e4 | 370 | |
cb183a06 HR |
371 | if (!rmpp_active) { |
372 | /* Copy message from user into send buffer */ | |
373 | if (copy_from_user(packet->msg->mad, | |
2e0c512a | 374 | buf + sizeof (struct ib_user_mad), length)) { |
cb183a06 HR |
375 | ret = -EFAULT; |
376 | goto err_msg; | |
377 | } | |
378 | } else { | |
2e0c512a RD |
379 | rmpp_hdr_size = sizeof (struct ib_mad_hdr) + |
380 | sizeof (struct ib_rmpp_hdr); | |
cb183a06 HR |
381 | |
382 | /* Only copy MAD headers (RMPP header in place) */ | |
383 | memcpy(packet->msg->mad, packet->mad.data, | |
2e0c512a | 384 | sizeof (struct ib_mad_hdr)); |
cb183a06 HR |
385 | |
386 | /* Now, copy rest of message from user into send buffer */ | |
387 | if (copy_from_user(((struct ib_rmpp_mad *) packet->msg->mad)->data, | |
388 | buf + sizeof (struct ib_user_mad) + rmpp_hdr_size, | |
389 | length - rmpp_hdr_size)) { | |
390 | ret = -EFAULT; | |
391 | goto err_msg; | |
392 | } | |
393 | } | |
394 | ||
395 | /* | |
396 | * If userspace is generating a request that will generate a | |
397 | * response, we need to make sure the high-order part of the | |
398 | * transaction ID matches the agent being used to send the | |
399 | * MAD. | |
400 | */ | |
089a1bed | 401 | method = ((struct ib_mad_hdr *) packet->msg->mad)->method; |
cb183a06 HR |
402 | |
403 | if (!(method & IB_MGMT_METHOD_RESP) && | |
404 | method != IB_MGMT_METHOD_TRAP_REPRESS && | |
405 | method != IB_MGMT_METHOD_SEND) { | |
089a1bed | 406 | tid = &((struct ib_mad_hdr *) packet->msg->mad)->tid; |
cb183a06 HR |
407 | *tid = cpu_to_be64(((u64) agent->hi_tid) << 32 | |
408 | (be64_to_cpup(tid) & 0xffffffff)); | |
1da177e4 LT |
409 | } |
410 | ||
34816ad9 | 411 | ret = ib_post_send_mad(packet->msg, NULL); |
cb183a06 HR |
412 | if (ret) |
413 | goto err_msg; | |
414 | ||
1da177e4 LT |
415 | up_read(&file->agent_mutex); |
416 | ||
cb183a06 HR |
417 | return sizeof (struct ib_user_mad_hdr) + packet->length; |
418 | ||
419 | err_msg: | |
420 | ib_free_send_mad(packet->msg); | |
421 | ||
422 | err_ah: | |
34816ad9 | 423 | ib_destroy_ah(ah); |
1da177e4 LT |
424 | |
425 | err_up: | |
426 | up_read(&file->agent_mutex); | |
427 | ||
428 | err: | |
429 | kfree(packet); | |
430 | return ret; | |
431 | } | |
432 | ||
433 | static unsigned int ib_umad_poll(struct file *filp, struct poll_table_struct *wait) | |
434 | { | |
435 | struct ib_umad_file *file = filp->private_data; | |
436 | ||
437 | /* we will always be able to post a MAD send */ | |
438 | unsigned int mask = POLLOUT | POLLWRNORM; | |
439 | ||
440 | poll_wait(filp, &file->recv_wait, wait); | |
441 | ||
442 | if (!list_empty(&file->recv_list)) | |
443 | mask |= POLLIN | POLLRDNORM; | |
444 | ||
445 | return mask; | |
446 | } | |
447 | ||
448 | static int ib_umad_reg_agent(struct ib_umad_file *file, unsigned long arg) | |
449 | { | |
450 | struct ib_user_mad_reg_req ureq; | |
451 | struct ib_mad_reg_req req; | |
452 | struct ib_mad_agent *agent; | |
453 | int agent_id; | |
454 | int ret; | |
455 | ||
456 | down_write(&file->agent_mutex); | |
457 | ||
458 | if (copy_from_user(&ureq, (void __user *) arg, sizeof ureq)) { | |
459 | ret = -EFAULT; | |
460 | goto out; | |
461 | } | |
462 | ||
463 | if (ureq.qpn != 0 && ureq.qpn != 1) { | |
464 | ret = -EINVAL; | |
465 | goto out; | |
466 | } | |
467 | ||
468 | for (agent_id = 0; agent_id < IB_UMAD_MAX_AGENTS; ++agent_id) | |
469 | if (!file->agent[agent_id]) | |
470 | goto found; | |
471 | ||
472 | ret = -ENOMEM; | |
473 | goto out; | |
474 | ||
475 | found: | |
0df3bb13 RD |
476 | if (ureq.mgmt_class) { |
477 | req.mgmt_class = ureq.mgmt_class; | |
478 | req.mgmt_class_version = ureq.mgmt_class_version; | |
479 | memcpy(req.method_mask, ureq.method_mask, sizeof req.method_mask); | |
480 | memcpy(req.oui, ureq.oui, sizeof req.oui); | |
481 | } | |
1da177e4 LT |
482 | |
483 | agent = ib_register_mad_agent(file->port->ib_dev, file->port->port_num, | |
484 | ureq.qpn ? IB_QPT_GSI : IB_QPT_SMI, | |
0df3bb13 | 485 | ureq.mgmt_class ? &req : NULL, |
cb183a06 HR |
486 | ureq.rmpp_version, |
487 | send_handler, recv_handler, file); | |
1da177e4 LT |
488 | if (IS_ERR(agent)) { |
489 | ret = PTR_ERR(agent); | |
490 | goto out; | |
491 | } | |
492 | ||
493 | file->agent[agent_id] = agent; | |
494 | ||
495 | file->mr[agent_id] = ib_get_dma_mr(agent->qp->pd, IB_ACCESS_LOCAL_WRITE); | |
496 | if (IS_ERR(file->mr[agent_id])) { | |
497 | ret = -ENOMEM; | |
498 | goto err; | |
499 | } | |
500 | ||
501 | if (put_user(agent_id, | |
502 | (u32 __user *) (arg + offsetof(struct ib_user_mad_reg_req, id)))) { | |
503 | ret = -EFAULT; | |
504 | goto err_mr; | |
505 | } | |
506 | ||
507 | ret = 0; | |
508 | goto out; | |
509 | ||
510 | err_mr: | |
511 | ib_dereg_mr(file->mr[agent_id]); | |
512 | ||
513 | err: | |
514 | file->agent[agent_id] = NULL; | |
515 | ib_unregister_mad_agent(agent); | |
516 | ||
517 | out: | |
518 | up_write(&file->agent_mutex); | |
519 | return ret; | |
520 | } | |
521 | ||
522 | static int ib_umad_unreg_agent(struct ib_umad_file *file, unsigned long arg) | |
523 | { | |
524 | u32 id; | |
525 | int ret = 0; | |
526 | ||
527 | down_write(&file->agent_mutex); | |
528 | ||
529 | if (get_user(id, (u32 __user *) arg)) { | |
530 | ret = -EFAULT; | |
531 | goto out; | |
532 | } | |
533 | ||
534 | if (id < 0 || id >= IB_UMAD_MAX_AGENTS || !file->agent[id]) { | |
535 | ret = -EINVAL; | |
536 | goto out; | |
537 | } | |
538 | ||
539 | ib_dereg_mr(file->mr[id]); | |
540 | ib_unregister_mad_agent(file->agent[id]); | |
541 | file->agent[id] = NULL; | |
542 | ||
543 | out: | |
544 | up_write(&file->agent_mutex); | |
545 | return ret; | |
546 | } | |
547 | ||
cb183a06 HR |
548 | static long ib_umad_ioctl(struct file *filp, unsigned int cmd, |
549 | unsigned long arg) | |
1da177e4 LT |
550 | { |
551 | switch (cmd) { | |
552 | case IB_USER_MAD_REGISTER_AGENT: | |
553 | return ib_umad_reg_agent(filp->private_data, arg); | |
554 | case IB_USER_MAD_UNREGISTER_AGENT: | |
555 | return ib_umad_unreg_agent(filp->private_data, arg); | |
556 | default: | |
557 | return -ENOIOCTLCMD; | |
558 | } | |
559 | } | |
560 | ||
561 | static int ib_umad_open(struct inode *inode, struct file *filp) | |
562 | { | |
563 | struct ib_umad_port *port = | |
564 | container_of(inode->i_cdev, struct ib_umad_port, dev); | |
565 | struct ib_umad_file *file; | |
566 | ||
567 | file = kmalloc(sizeof *file, GFP_KERNEL); | |
568 | if (!file) | |
569 | return -ENOMEM; | |
570 | ||
571 | memset(file, 0, sizeof *file); | |
572 | ||
573 | spin_lock_init(&file->recv_lock); | |
574 | init_rwsem(&file->agent_mutex); | |
575 | INIT_LIST_HEAD(&file->recv_list); | |
576 | init_waitqueue_head(&file->recv_wait); | |
577 | ||
578 | file->port = port; | |
579 | filp->private_data = file; | |
580 | ||
581 | return 0; | |
582 | } | |
583 | ||
584 | static int ib_umad_close(struct inode *inode, struct file *filp) | |
585 | { | |
586 | struct ib_umad_file *file = filp->private_data; | |
561e148e | 587 | struct ib_umad_packet *packet, *tmp; |
1da177e4 LT |
588 | int i; |
589 | ||
590 | for (i = 0; i < IB_UMAD_MAX_AGENTS; ++i) | |
591 | if (file->agent[i]) { | |
592 | ib_dereg_mr(file->mr[i]); | |
593 | ib_unregister_mad_agent(file->agent[i]); | |
594 | } | |
595 | ||
561e148e RD |
596 | list_for_each_entry_safe(packet, tmp, &file->recv_list, list) |
597 | kfree(packet); | |
598 | ||
1da177e4 LT |
599 | kfree(file); |
600 | ||
601 | return 0; | |
602 | } | |
603 | ||
604 | static struct file_operations umad_fops = { | |
cb183a06 HR |
605 | .owner = THIS_MODULE, |
606 | .read = ib_umad_read, | |
607 | .write = ib_umad_write, | |
608 | .poll = ib_umad_poll, | |
1da177e4 | 609 | .unlocked_ioctl = ib_umad_ioctl, |
cb183a06 HR |
610 | .compat_ioctl = ib_umad_ioctl, |
611 | .open = ib_umad_open, | |
612 | .release = ib_umad_close | |
1da177e4 LT |
613 | }; |
614 | ||
615 | static int ib_umad_sm_open(struct inode *inode, struct file *filp) | |
616 | { | |
617 | struct ib_umad_port *port = | |
618 | container_of(inode->i_cdev, struct ib_umad_port, sm_dev); | |
619 | struct ib_port_modify props = { | |
620 | .set_port_cap_mask = IB_PORT_SM | |
621 | }; | |
622 | int ret; | |
623 | ||
624 | if (filp->f_flags & O_NONBLOCK) { | |
625 | if (down_trylock(&port->sm_sem)) | |
626 | return -EAGAIN; | |
627 | } else { | |
628 | if (down_interruptible(&port->sm_sem)) | |
629 | return -ERESTARTSYS; | |
630 | } | |
631 | ||
632 | ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props); | |
633 | if (ret) { | |
634 | up(&port->sm_sem); | |
635 | return ret; | |
636 | } | |
637 | ||
638 | filp->private_data = port; | |
639 | ||
640 | return 0; | |
641 | } | |
642 | ||
643 | static int ib_umad_sm_close(struct inode *inode, struct file *filp) | |
644 | { | |
645 | struct ib_umad_port *port = filp->private_data; | |
646 | struct ib_port_modify props = { | |
647 | .clr_port_cap_mask = IB_PORT_SM | |
648 | }; | |
649 | int ret; | |
650 | ||
651 | ret = ib_modify_port(port->ib_dev, port->port_num, 0, &props); | |
652 | up(&port->sm_sem); | |
653 | ||
654 | return ret; | |
655 | } | |
656 | ||
657 | static struct file_operations umad_sm_fops = { | |
658 | .owner = THIS_MODULE, | |
659 | .open = ib_umad_sm_open, | |
660 | .release = ib_umad_sm_close | |
661 | }; | |
662 | ||
663 | static struct ib_client umad_client = { | |
664 | .name = "umad", | |
665 | .add = ib_umad_add_one, | |
666 | .remove = ib_umad_remove_one | |
667 | }; | |
668 | ||
1da177e4 LT |
669 | static ssize_t show_ibdev(struct class_device *class_dev, char *buf) |
670 | { | |
671 | struct ib_umad_port *port = class_get_devdata(class_dev); | |
672 | ||
673 | return sprintf(buf, "%s\n", port->ib_dev->name); | |
674 | } | |
675 | static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); | |
676 | ||
677 | static ssize_t show_port(struct class_device *class_dev, char *buf) | |
678 | { | |
679 | struct ib_umad_port *port = class_get_devdata(class_dev); | |
680 | ||
681 | return sprintf(buf, "%d\n", port->port_num); | |
682 | } | |
683 | static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL); | |
684 | ||
685 | static void ib_umad_release_dev(struct kref *ref) | |
686 | { | |
687 | struct ib_umad_device *dev = | |
688 | container_of(ref, struct ib_umad_device, ref); | |
689 | ||
690 | kfree(dev); | |
691 | } | |
692 | ||
693 | static void ib_umad_release_port(struct class_device *class_dev) | |
694 | { | |
695 | struct ib_umad_port *port = class_get_devdata(class_dev); | |
696 | ||
697 | if (class_dev == &port->class_dev) { | |
698 | cdev_del(&port->dev); | |
699 | clear_bit(port->devnum, dev_map); | |
700 | } else { | |
701 | cdev_del(&port->sm_dev); | |
702 | clear_bit(port->sm_devnum, dev_map); | |
703 | } | |
704 | ||
705 | kref_put(&port->umad_dev->ref, ib_umad_release_dev); | |
706 | } | |
707 | ||
708 | static struct class umad_class = { | |
709 | .name = "infiniband_mad", | |
710 | .release = ib_umad_release_port | |
711 | }; | |
712 | ||
713 | static ssize_t show_abi_version(struct class *class, char *buf) | |
714 | { | |
715 | return sprintf(buf, "%d\n", IB_USER_MAD_ABI_VERSION); | |
716 | } | |
717 | static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL); | |
718 | ||
719 | static int ib_umad_init_port(struct ib_device *device, int port_num, | |
720 | struct ib_umad_port *port) | |
721 | { | |
722 | spin_lock(&map_lock); | |
723 | port->devnum = find_first_zero_bit(dev_map, IB_UMAD_MAX_PORTS); | |
724 | if (port->devnum >= IB_UMAD_MAX_PORTS) { | |
725 | spin_unlock(&map_lock); | |
726 | return -1; | |
727 | } | |
728 | port->sm_devnum = find_next_zero_bit(dev_map, IB_UMAD_MAX_PORTS * 2, IB_UMAD_MAX_PORTS); | |
729 | if (port->sm_devnum >= IB_UMAD_MAX_PORTS * 2) { | |
730 | spin_unlock(&map_lock); | |
731 | return -1; | |
732 | } | |
733 | set_bit(port->devnum, dev_map); | |
734 | set_bit(port->sm_devnum, dev_map); | |
735 | spin_unlock(&map_lock); | |
736 | ||
737 | port->ib_dev = device; | |
738 | port->port_num = port_num; | |
739 | init_MUTEX(&port->sm_sem); | |
740 | ||
741 | cdev_init(&port->dev, &umad_fops); | |
742 | port->dev.owner = THIS_MODULE; | |
743 | kobject_set_name(&port->dev.kobj, "umad%d", port->devnum); | |
744 | if (cdev_add(&port->dev, base_dev + port->devnum, 1)) | |
745 | return -1; | |
746 | ||
747 | port->class_dev.class = &umad_class; | |
748 | port->class_dev.dev = device->dma_device; | |
bbf20786 | 749 | port->class_dev.devt = port->dev.dev; |
1da177e4 LT |
750 | |
751 | snprintf(port->class_dev.class_id, BUS_ID_SIZE, "umad%d", port->devnum); | |
752 | ||
753 | if (class_device_register(&port->class_dev)) | |
754 | goto err_cdev; | |
755 | ||
756 | class_set_devdata(&port->class_dev, port); | |
757 | kref_get(&port->umad_dev->ref); | |
758 | ||
1da177e4 LT |
759 | if (class_device_create_file(&port->class_dev, &class_device_attr_ibdev)) |
760 | goto err_class; | |
761 | if (class_device_create_file(&port->class_dev, &class_device_attr_port)) | |
762 | goto err_class; | |
763 | ||
764 | cdev_init(&port->sm_dev, &umad_sm_fops); | |
765 | port->sm_dev.owner = THIS_MODULE; | |
766 | kobject_set_name(&port->dev.kobj, "issm%d", port->sm_devnum - IB_UMAD_MAX_PORTS); | |
767 | if (cdev_add(&port->sm_dev, base_dev + port->sm_devnum, 1)) | |
768 | return -1; | |
769 | ||
770 | port->sm_class_dev.class = &umad_class; | |
771 | port->sm_class_dev.dev = device->dma_device; | |
bbf20786 | 772 | port->sm_class_dev.devt = port->sm_dev.dev; |
1da177e4 LT |
773 | |
774 | snprintf(port->sm_class_dev.class_id, BUS_ID_SIZE, "issm%d", port->sm_devnum - IB_UMAD_MAX_PORTS); | |
775 | ||
776 | if (class_device_register(&port->sm_class_dev)) | |
777 | goto err_sm_cdev; | |
778 | ||
779 | class_set_devdata(&port->sm_class_dev, port); | |
780 | kref_get(&port->umad_dev->ref); | |
781 | ||
1da177e4 LT |
782 | if (class_device_create_file(&port->sm_class_dev, &class_device_attr_ibdev)) |
783 | goto err_sm_class; | |
784 | if (class_device_create_file(&port->sm_class_dev, &class_device_attr_port)) | |
785 | goto err_sm_class; | |
786 | ||
787 | return 0; | |
788 | ||
789 | err_sm_class: | |
790 | class_device_unregister(&port->sm_class_dev); | |
791 | ||
792 | err_sm_cdev: | |
793 | cdev_del(&port->sm_dev); | |
794 | ||
795 | err_class: | |
796 | class_device_unregister(&port->class_dev); | |
797 | ||
798 | err_cdev: | |
799 | cdev_del(&port->dev); | |
800 | clear_bit(port->devnum, dev_map); | |
801 | ||
802 | return -1; | |
803 | } | |
804 | ||
805 | static void ib_umad_add_one(struct ib_device *device) | |
806 | { | |
807 | struct ib_umad_device *umad_dev; | |
808 | int s, e, i; | |
809 | ||
810 | if (device->node_type == IB_NODE_SWITCH) | |
811 | s = e = 0; | |
812 | else { | |
813 | s = 1; | |
814 | e = device->phys_port_cnt; | |
815 | } | |
816 | ||
817 | umad_dev = kmalloc(sizeof *umad_dev + | |
818 | (e - s + 1) * sizeof (struct ib_umad_port), | |
819 | GFP_KERNEL); | |
820 | if (!umad_dev) | |
821 | return; | |
822 | ||
823 | memset(umad_dev, 0, sizeof *umad_dev + | |
824 | (e - s + 1) * sizeof (struct ib_umad_port)); | |
825 | ||
826 | kref_init(&umad_dev->ref); | |
827 | ||
828 | umad_dev->start_port = s; | |
829 | umad_dev->end_port = e; | |
830 | ||
831 | for (i = s; i <= e; ++i) { | |
832 | umad_dev->port[i - s].umad_dev = umad_dev; | |
833 | ||
834 | if (ib_umad_init_port(device, i, &umad_dev->port[i - s])) | |
835 | goto err; | |
836 | } | |
837 | ||
838 | ib_set_client_data(device, &umad_client, umad_dev); | |
839 | ||
840 | return; | |
841 | ||
842 | err: | |
843 | while (--i >= s) { | |
844 | class_device_unregister(&umad_dev->port[i - s].class_dev); | |
845 | class_device_unregister(&umad_dev->port[i - s].sm_class_dev); | |
846 | } | |
847 | ||
848 | kref_put(&umad_dev->ref, ib_umad_release_dev); | |
849 | } | |
850 | ||
851 | static void ib_umad_remove_one(struct ib_device *device) | |
852 | { | |
853 | struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client); | |
854 | int i; | |
855 | ||
856 | if (!umad_dev) | |
857 | return; | |
858 | ||
859 | for (i = 0; i <= umad_dev->end_port - umad_dev->start_port; ++i) { | |
860 | class_device_unregister(&umad_dev->port[i].class_dev); | |
861 | class_device_unregister(&umad_dev->port[i].sm_class_dev); | |
862 | } | |
863 | ||
864 | kref_put(&umad_dev->ref, ib_umad_release_dev); | |
865 | } | |
866 | ||
867 | static int __init ib_umad_init(void) | |
868 | { | |
869 | int ret; | |
870 | ||
871 | spin_lock_init(&map_lock); | |
872 | ||
873 | ret = register_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2, | |
874 | "infiniband_mad"); | |
875 | if (ret) { | |
876 | printk(KERN_ERR "user_mad: couldn't register device number\n"); | |
877 | goto out; | |
878 | } | |
879 | ||
880 | ret = class_register(&umad_class); | |
881 | if (ret) { | |
882 | printk(KERN_ERR "user_mad: couldn't create class infiniband_mad\n"); | |
883 | goto out_chrdev; | |
884 | } | |
885 | ||
886 | ret = class_create_file(&umad_class, &class_attr_abi_version); | |
887 | if (ret) { | |
888 | printk(KERN_ERR "user_mad: couldn't create abi_version attribute\n"); | |
889 | goto out_class; | |
890 | } | |
891 | ||
892 | ret = ib_register_client(&umad_client); | |
893 | if (ret) { | |
894 | printk(KERN_ERR "user_mad: couldn't register ib_umad client\n"); | |
895 | goto out_class; | |
896 | } | |
897 | ||
898 | return 0; | |
899 | ||
900 | out_class: | |
901 | class_unregister(&umad_class); | |
902 | ||
903 | out_chrdev: | |
904 | unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2); | |
905 | ||
906 | out: | |
907 | return ret; | |
908 | } | |
909 | ||
910 | static void __exit ib_umad_cleanup(void) | |
911 | { | |
912 | ib_unregister_client(&umad_client); | |
913 | class_unregister(&umad_class); | |
914 | unregister_chrdev_region(base_dev, IB_UMAD_MAX_PORTS * 2); | |
915 | } | |
916 | ||
917 | module_init(ib_umad_init); | |
918 | module_exit(ib_umad_cleanup); |