xref: /freebsd/contrib/ofed/libibverbs/device.c (revision af23369a6deaaeb612ab266eb88b8bb8d560c322) 
1 /*
2  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
3  * Copyright (c) 2006, 2007 Cisco Systems, Inc.  All rights reserved.
4  *
5  * This software is available to you under a choice of one of two
6  * licenses.  You may choose to be licensed under the terms of the GNU
7  * General Public License (GPL) Version 2, available from the file
8  * COPYING in the main directory of this source tree, or the
9  * OpenIB.org BSD license below:
10  *
11  *     Redistribution and use in source and binary forms, with or
12  *     without modification, are permitted provided that the following
13  *     conditions are met:
14  *
15  *      - Redistributions of source code must retain the above
16  *        copyright notice, this list of conditions and the following
17  *        disclaimer.
18  *
19  *      - Redistributions in binary form must reproduce the above
20  *        copyright notice, this list of conditions and the following
21  *        disclaimer in the documentation and/or other materials
22  *        provided with the distribution.
23  *
24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31  * SOFTWARE.
32  */
33 #define _GNU_SOURCE
34 #include <config.h>
35 
36 #include <infiniband/endian.h>
37 #include <stdio.h>
38 #include <sys/types.h>
39 #include <sys/stat.h>
40 #include <fcntl.h>
41 #include <unistd.h>
42 #include <stdlib.h>
43 #include <alloca.h>
44 #include <errno.h>
45 
46 #include "ibverbs.h"
47 
48 /* Hack to avoid GCC's -Wmissing-prototypes and the similar error from sparse
49    with these prototypes. Symbol versionining requires the goofy names, the
50    prototype must match the version in verbs.h.
51  */
52 struct ibv_device **__ibv_get_device_list(int *num_devices);
53 void __ibv_free_device_list(struct ibv_device **list);
54 const char *__ibv_get_device_name(struct ibv_device *device);
55 __be64 __ibv_get_device_guid(struct ibv_device *device);
56 struct ibv_context *__ibv_open_device(struct ibv_device *device);
57 int __ibv_close_device(struct ibv_context *context);
58 int __ibv_get_async_event(struct ibv_context *context,
59 			  struct ibv_async_event *event);
60 void __ibv_ack_async_event(struct ibv_async_event *event);
61 
62 static pthread_once_t device_list_once = PTHREAD_ONCE_INIT;
63 static int num_devices;
64 static struct ibv_device **device_list;
65 
66 static void count_devices(void)
67 {
68 	num_devices = ibverbs_init(&device_list);
69 }
70 
71 struct ibv_device **__ibv_get_device_list(int *num)
72 {
73 	struct ibv_device **l;
74 	int i;
75 
76 	if (num)
77 		*num = 0;
78 
79 	pthread_once(&device_list_once, count_devices);
80 
81 	if (num_devices < 0) {
82 		errno = -num_devices;
83 		return NULL;
84 	}
85 
86 	l = calloc(num_devices + 1, sizeof (struct ibv_device *));
87 	if (!l) {
88 		errno = ENOMEM;
89 		return NULL;
90 	}
91 
92 	for (i = 0; i < num_devices; ++i)
93 		l[i] = device_list[i];
94 	if (num)
95 		*num = num_devices;
96 
97 	return l;
98 }
99 default_symver(__ibv_get_device_list, ibv_get_device_list);
100 
101 void __ibv_free_device_list(struct ibv_device **list)
102 {
103 	free(list);
104 }
105 default_symver(__ibv_free_device_list, ibv_free_device_list);
106 
107 const char *__ibv_get_device_name(struct ibv_device *device)
108 {
109 	return device->name;
110 }
111 default_symver(__ibv_get_device_name, ibv_get_device_name);
112 
113 __be64 __ibv_get_device_guid(struct ibv_device *device)
114 {
115 	char attr[24];
116 	uint64_t guid = 0;
117 	uint16_t parts[4];
118 	int i;
119 
120 	if (ibv_read_sysfs_file(device->ibdev_path, "node_guid",
121 				attr, sizeof attr) < 0)
122 		return 0;
123 
124 	if (sscanf(attr, "%hx:%hx:%hx:%hx",
125 		   parts, parts + 1, parts + 2, parts + 3) != 4)
126 		return 0;
127 
128 	for (i = 0; i < 4; ++i)
129 		guid = (guid << 16) | parts[i];
130 
131 	return htobe64(guid);
132 }
133 default_symver(__ibv_get_device_guid, ibv_get_device_guid);
134 
135 void verbs_init_cq(struct ibv_cq *cq, struct ibv_context *context,
136 		       struct ibv_comp_channel *channel,
137 		       void *cq_context)
138 {
139 	cq->context		   = context;
140 	cq->channel		   = channel;
141 
142 	if (cq->channel) {
143 		pthread_mutex_lock(&context->mutex);
144 		++cq->channel->refcnt;
145 		pthread_mutex_unlock(&context->mutex);
146 	}
147 
148 	cq->cq_context		   = cq_context;
149 	cq->comp_events_completed  = 0;
150 	cq->async_events_completed = 0;
151 	pthread_mutex_init(&cq->mutex, NULL);
152 	pthread_cond_init(&cq->cond, NULL);
153 }
154 
155 static struct ibv_cq_ex *
156 __lib_ibv_create_cq_ex(struct ibv_context *context,
157 		       struct ibv_cq_init_attr_ex *cq_attr)
158 {
159 	struct verbs_context *vctx = verbs_get_ctx(context);
160 	struct ibv_cq_ex *cq;
161 
162 	if (cq_attr->wc_flags & ~IBV_CREATE_CQ_SUP_WC_FLAGS) {
163 		errno = EOPNOTSUPP;
164 		return NULL;
165 	}
166 
167 	cq = vctx->priv->create_cq_ex(context, cq_attr);
168 
169 	if (cq)
170 		verbs_init_cq(ibv_cq_ex_to_cq(cq), context,
171 			        cq_attr->channel, cq_attr->cq_context);
172 
173 	return cq;
174 }
175 
176 struct ibv_context *__ibv_open_device(struct ibv_device *device)
177 {
178 	struct verbs_device *verbs_device = verbs_get_device(device);
179 	char *devpath;
180 	int cmd_fd, ret;
181 	struct ibv_context *context;
182 	struct verbs_context *context_ex;
183 
184 	if (asprintf(&devpath, "/dev/%s", device->dev_name) < 0)
185 		return NULL;
186 
187 	/*
188 	 * We'll only be doing writes, but we need O_RDWR in case the
189 	 * provider needs to mmap() the file.
190 	 */
191 	cmd_fd = open(devpath, O_RDWR | O_CLOEXEC);
192 	free(devpath);
193 
194 	if (cmd_fd < 0)
195 		return NULL;
196 
197 	if (!verbs_device->ops->init_context) {
198 		context = verbs_device->ops->alloc_context(device, cmd_fd);
199 		if (!context)
200 			goto err;
201 	} else {
202 		struct verbs_ex_private *priv;
203 
204 		/* Library now allocates the context */
205 		context_ex = calloc(1, sizeof(*context_ex) +
206 				       verbs_device->size_of_context);
207 		if (!context_ex) {
208 			errno = ENOMEM;
209 			goto err;
210 		}
211 
212 		priv = calloc(1, sizeof(*priv));
213 		if (!priv) {
214 			errno = ENOMEM;
215 			free(context_ex);
216 			goto err;
217 		}
218 
219 		context_ex->priv = priv;
220 		context_ex->context.abi_compat  = __VERBS_ABI_IS_EXTENDED;
221 		context_ex->sz = sizeof(*context_ex);
222 
223 		context = &context_ex->context;
224 		ret = verbs_device->ops->init_context(verbs_device, context, cmd_fd);
225 		if (ret)
226 			goto verbs_err;
227 		/*
228 		 * In order to maintain backward/forward binary compatibility
229 		 * with apps compiled against libibverbs-1.1.8 that use the
230 		 * flow steering addition, we need to set the two
231 		 * ABI_placeholder entries to match the driver set flow
232 		 * entries.  This is because apps compiled against
233 		 * libibverbs-1.1.8 use an inline ibv_create_flow and
234 		 * ibv_destroy_flow function that looks in the placeholder
235 		 * spots for the proper entry points.  For apps compiled
236 		 * against libibverbs-1.1.9 and later, the inline functions
237 		 * will be looking in the right place.
238 		 */
239 		context_ex->ABI_placeholder1 = (void (*)(void)) context_ex->ibv_create_flow;
240 		context_ex->ABI_placeholder2 = (void (*)(void)) context_ex->ibv_destroy_flow;
241 
242 		if (context_ex->create_cq_ex) {
243 			priv->create_cq_ex = context_ex->create_cq_ex;
244 			context_ex->create_cq_ex = __lib_ibv_create_cq_ex;
245 		}
246 	}
247 
248 	context->device = device;
249 	context->cmd_fd = cmd_fd;
250 	pthread_mutex_init(&context->mutex, NULL);
251 
252 	return context;
253 
254 verbs_err:
255 	free(context_ex->priv);
256 	free(context_ex);
257 err:
258 	close(cmd_fd);
259 	return NULL;
260 }
261 default_symver(__ibv_open_device, ibv_open_device);
262 
263 int __ibv_close_device(struct ibv_context *context)
264 {
265 	int async_fd = context->async_fd;
266 	int cmd_fd   = context->cmd_fd;
267 	struct verbs_context *context_ex;
268 	struct verbs_device *verbs_device = verbs_get_device(context->device);
269 
270 	context_ex = verbs_get_ctx(context);
271 	if (context_ex) {
272 		verbs_device->ops->uninit_context(verbs_device, context);
273 		free(context_ex->priv);
274 		free(context_ex);
275 	} else {
276 		verbs_device->ops->free_context(context);
277 	}
278 
279 	close(async_fd);
280 	close(cmd_fd);
281 
282 	return 0;
283 }
284 default_symver(__ibv_close_device, ibv_close_device);
285 
286 int __ibv_get_async_event(struct ibv_context *context,
287 			  struct ibv_async_event *event)
288 {
289 	struct ibv_kern_async_event ev;
290 
291 	if (read(context->async_fd, &ev, sizeof ev) != sizeof ev)
292 		return -1;
293 
294 	event->event_type = ev.event_type;
295 
296 	switch (event->event_type) {
297 	case IBV_EVENT_CQ_ERR:
298 		event->element.cq = (void *) (uintptr_t) ev.element;
299 		break;
300 
301 	case IBV_EVENT_QP_FATAL:
302 	case IBV_EVENT_QP_REQ_ERR:
303 	case IBV_EVENT_QP_ACCESS_ERR:
304 	case IBV_EVENT_COMM_EST:
305 	case IBV_EVENT_SQ_DRAINED:
306 	case IBV_EVENT_PATH_MIG:
307 	case IBV_EVENT_PATH_MIG_ERR:
308 	case IBV_EVENT_QP_LAST_WQE_REACHED:
309 		event->element.qp = (void *) (uintptr_t) ev.element;
310 		break;
311 
312 	case IBV_EVENT_SRQ_ERR:
313 	case IBV_EVENT_SRQ_LIMIT_REACHED:
314 		event->element.srq = (void *) (uintptr_t) ev.element;
315 		break;
316 
317 	case IBV_EVENT_WQ_FATAL:
318 		event->element.wq = (void *) (uintptr_t) ev.element;
319 		break;
320 	default:
321 		event->element.port_num = ev.element;
322 		break;
323 	}
324 
325 	if (context->ops.async_event)
326 		context->ops.async_event(event);
327 
328 	return 0;
329 }
330 default_symver(__ibv_get_async_event, ibv_get_async_event);
331 
332 void __ibv_ack_async_event(struct ibv_async_event *event)
333 {
334 	switch (event->event_type) {
335 	case IBV_EVENT_CQ_ERR:
336 	{
337 		struct ibv_cq *cq = event->element.cq;
338 
339 		pthread_mutex_lock(&cq->mutex);
340 		++cq->async_events_completed;
341 		pthread_cond_signal(&cq->cond);
342 		pthread_mutex_unlock(&cq->mutex);
343 
344 		return;
345 	}
346 
347 	case IBV_EVENT_QP_FATAL:
348 	case IBV_EVENT_QP_REQ_ERR:
349 	case IBV_EVENT_QP_ACCESS_ERR:
350 	case IBV_EVENT_COMM_EST:
351 	case IBV_EVENT_SQ_DRAINED:
352 	case IBV_EVENT_PATH_MIG:
353 	case IBV_EVENT_PATH_MIG_ERR:
354 	case IBV_EVENT_QP_LAST_WQE_REACHED:
355 	{
356 		struct ibv_qp *qp = event->element.qp;
357 
358 		pthread_mutex_lock(&qp->mutex);
359 		++qp->events_completed;
360 		pthread_cond_signal(&qp->cond);
361 		pthread_mutex_unlock(&qp->mutex);
362 
363 		return;
364 	}
365 
366 	case IBV_EVENT_SRQ_ERR:
367 	case IBV_EVENT_SRQ_LIMIT_REACHED:
368 	{
369 		struct ibv_srq *srq = event->element.srq;
370 
371 		pthread_mutex_lock(&srq->mutex);
372 		++srq->events_completed;
373 		pthread_cond_signal(&srq->cond);
374 		pthread_mutex_unlock(&srq->mutex);
375 
376 		return;
377 	}
378 
379 	case IBV_EVENT_WQ_FATAL:
380 	{
381 		struct ibv_wq *wq = event->element.wq;
382 
383 		pthread_mutex_lock(&wq->mutex);
384 		++wq->events_completed;
385 		pthread_cond_signal(&wq->cond);
386 		pthread_mutex_unlock(&wq->mutex);
387 
388 		return;
389 	}
390 
391 	default:
392 		return;
393 	}
394 }
395 default_symver(__ibv_ack_async_event, ibv_ack_async_event);
396