1/*
2 * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
3 * Copyright (c) 2006 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 <stdlib.h>
37#include <string.h>
38#include <glob.h>
39#include <stdio.h>
40#include <dlfcn.h>
41#include <unistd.h>
42#include <sys/stat.h>
43#include <sys/types.h>
44#include <sys/time.h>
45#include <sys/resource.h>
46#include <dirent.h>
47#include <errno.h>
48#include <assert.h>
49
50#include "ibverbs.h"
51
52#pragma GCC diagnostic ignored "-Wmissing-prototypes"
53
54int abi_ver;
55
56struct ibv_sysfs_dev {
57	char		        sysfs_name[IBV_SYSFS_NAME_MAX];
58	char		        ibdev_name[IBV_SYSFS_NAME_MAX];
59	char		        sysfs_path[IBV_SYSFS_PATH_MAX];
60	char		        ibdev_path[IBV_SYSFS_PATH_MAX];
61	struct ibv_sysfs_dev   *next;
62	int			abi_ver;
63	int			have_driver;
64};
65
66struct ibv_driver_name {
67	char		       *name;
68	struct ibv_driver_name *next;
69};
70
71struct ibv_driver {
72	const char	       *name;
73	verbs_driver_init_func	verbs_init_func;
74	struct ibv_driver      *next;
75};
76
77static struct ibv_sysfs_dev *sysfs_dev_list;
78static struct ibv_driver_name *driver_name_list;
79static struct ibv_driver *head_driver, *tail_driver;
80
81static int find_sysfs_devs(void)
82{
83	char class_path[IBV_SYSFS_PATH_MAX];
84	struct ibv_sysfs_dev *sysfs_dev = NULL;
85	char value[8];
86	int ret = 0;
87	int i;
88
89	snprintf(class_path, sizeof class_path, "%s/class/infiniband_verbs",
90		 ibv_get_sysfs_path());
91
92	for (i = 0; i < 256; i++) {
93		if (!sysfs_dev)
94			sysfs_dev = malloc(sizeof *sysfs_dev);
95		if (!sysfs_dev) {
96			ret = ENOMEM;
97			goto out;
98		}
99
100		snprintf(sysfs_dev->sysfs_path, sizeof sysfs_dev->sysfs_path,
101			 "%s/uverbs%d", class_path, i);
102
103		snprintf(sysfs_dev->sysfs_name, sizeof sysfs_dev->sysfs_name,
104			"uverbs%d", i);
105
106		if (ibv_read_sysfs_file(sysfs_dev->sysfs_path, "ibdev",
107					sysfs_dev->ibdev_name,
108					sizeof sysfs_dev->ibdev_name) < 0)
109			continue;
110
111		snprintf(sysfs_dev->ibdev_path, sizeof sysfs_dev->ibdev_path,
112			 "%s/class/infiniband/%s", ibv_get_sysfs_path(),
113			 sysfs_dev->ibdev_name);
114
115		sysfs_dev->next        = sysfs_dev_list;
116		sysfs_dev->have_driver = 0;
117		if (ibv_read_sysfs_file(sysfs_dev->sysfs_path, "abi_version",
118					value, sizeof value) > 0)
119			sysfs_dev->abi_ver = strtol(value, NULL, 10);
120		else
121			sysfs_dev->abi_ver = 0;
122
123		sysfs_dev_list = sysfs_dev;
124		sysfs_dev      = NULL;
125	}
126
127 out:
128	if (sysfs_dev)
129		free(sysfs_dev);
130
131	return ret;
132}
133
134void verbs_register_driver(const char *name,
135			   verbs_driver_init_func verbs_init_func)
136{
137	struct ibv_driver *driver;
138
139	driver = malloc(sizeof *driver);
140	if (!driver) {
141		fprintf(stderr, PFX "Warning: couldn't allocate driver for %s\n", name);
142		return;
143	}
144
145	driver->name            = name;
146	driver->verbs_init_func = verbs_init_func;
147	driver->next            = NULL;
148
149	if (tail_driver)
150		tail_driver->next = driver;
151	else
152		head_driver = driver;
153	tail_driver = driver;
154}
155
156static struct ibv_device *try_driver(struct ibv_driver *driver,
157				     struct ibv_sysfs_dev *sysfs_dev)
158{
159	struct verbs_device *vdev;
160	struct ibv_device *dev;
161	char value[16];
162
163	vdev = driver->verbs_init_func(sysfs_dev->sysfs_path, sysfs_dev->abi_ver);
164	if (!vdev)
165		return NULL;
166
167	dev = &vdev->device;
168	assert(dev->_ops._dummy1 == NULL);
169	assert(dev->_ops._dummy2 == NULL);
170
171	if (ibv_read_sysfs_file(sysfs_dev->ibdev_path, "node_type", value, sizeof value) < 0) {
172		fprintf(stderr, PFX "Warning: no node_type attr under %s.\n",
173			sysfs_dev->ibdev_path);
174			dev->node_type = IBV_NODE_UNKNOWN;
175	} else {
176		dev->node_type = strtol(value, NULL, 10);
177		if (dev->node_type < IBV_NODE_CA || dev->node_type > IBV_NODE_USNIC_UDP)
178			dev->node_type = IBV_NODE_UNKNOWN;
179	}
180
181	switch (dev->node_type) {
182	case IBV_NODE_CA:
183	case IBV_NODE_SWITCH:
184	case IBV_NODE_ROUTER:
185		dev->transport_type = IBV_TRANSPORT_IB;
186		break;
187	case IBV_NODE_RNIC:
188		dev->transport_type = IBV_TRANSPORT_IWARP;
189		break;
190	case IBV_NODE_USNIC:
191		dev->transport_type = IBV_TRANSPORT_USNIC;
192		break;
193	case IBV_NODE_USNIC_UDP:
194		dev->transport_type = IBV_TRANSPORT_USNIC_UDP;
195		break;
196	default:
197		dev->transport_type = IBV_TRANSPORT_UNKNOWN;
198		break;
199	}
200
201	strcpy(dev->dev_name,   sysfs_dev->sysfs_name);
202	strcpy(dev->dev_path,   sysfs_dev->sysfs_path);
203	strcpy(dev->name,       sysfs_dev->ibdev_name);
204	strcpy(dev->ibdev_path, sysfs_dev->ibdev_path);
205
206	return dev;
207}
208
209static struct ibv_device *try_drivers(struct ibv_sysfs_dev *sysfs_dev)
210{
211	struct ibv_driver *driver;
212	struct ibv_device *dev;
213
214	for (driver = head_driver; driver; driver = driver->next) {
215		dev = try_driver(driver, sysfs_dev);
216		if (dev)
217			return dev;
218	}
219
220	return NULL;
221}
222
223static int check_abi_version(const char *path)
224{
225	char value[8];
226
227	if (ibv_read_sysfs_file(path, "class/infiniband_verbs/abi_version",
228				value, sizeof value) < 0) {
229		return ENOSYS;
230	}
231
232	abi_ver = strtol(value, NULL, 10);
233
234	if (abi_ver < IB_USER_VERBS_MIN_ABI_VERSION ||
235	    abi_ver > IB_USER_VERBS_MAX_ABI_VERSION) {
236		fprintf(stderr, PFX "Fatal: kernel ABI version %d "
237			"doesn't match library version %d.\n",
238			abi_ver, IB_USER_VERBS_MAX_ABI_VERSION);
239		return ENOSYS;
240	}
241
242	return 0;
243}
244
245static void check_memlock_limit(void)
246{
247	struct rlimit rlim;
248
249	if (!geteuid())
250		return;
251
252	if (getrlimit(RLIMIT_MEMLOCK, &rlim)) {
253		fprintf(stderr, PFX "Warning: getrlimit(RLIMIT_MEMLOCK) failed.");
254		return;
255	}
256
257	if (rlim.rlim_cur <= 32768)
258		fprintf(stderr, PFX "Warning: RLIMIT_MEMLOCK is %lu bytes.\n"
259			"    This will severely limit memory registrations.\n",
260			rlim.rlim_cur);
261}
262
263static void add_device(struct ibv_device *dev,
264		       struct ibv_device ***dev_list,
265		       int *num_devices,
266		       int *list_size)
267{
268	struct ibv_device **new_list;
269
270	if (*list_size <= *num_devices) {
271		*list_size = *list_size ? *list_size * 2 : 1;
272		new_list = realloc(*dev_list, *list_size * sizeof (struct ibv_device *));
273		if (!new_list)
274			return;
275		*dev_list = new_list;
276	}
277
278	(*dev_list)[(*num_devices)++] = dev;
279}
280
281int ibverbs_init(struct ibv_device ***list)
282{
283	const char *sysfs_path;
284	struct ibv_sysfs_dev *sysfs_dev, *next_dev;
285	struct ibv_device *device;
286	int num_devices = 0;
287	int list_size = 0;
288	int statically_linked = 0;
289	int no_driver = 0;
290	int ret;
291
292	*list = NULL;
293
294	if (getenv("RDMAV_FORK_SAFE") || getenv("IBV_FORK_SAFE"))
295		if (ibv_fork_init())
296			fprintf(stderr, PFX "Warning: fork()-safety requested "
297				"but init failed\n");
298
299	sysfs_path = ibv_get_sysfs_path();
300	if (!sysfs_path)
301		return -ENOSYS;
302
303	ret = check_abi_version(sysfs_path);
304	if (ret)
305		return -ret;
306
307	check_memlock_limit();
308
309	ret = find_sysfs_devs();
310	if (ret)
311		return -ret;
312
313	for (sysfs_dev = sysfs_dev_list; sysfs_dev; sysfs_dev = sysfs_dev->next) {
314		device = try_drivers(sysfs_dev);
315		if (device) {
316			add_device(device, list, &num_devices, &list_size);
317			sysfs_dev->have_driver = 1;
318		} else
319			no_driver = 1;
320	}
321
322	if (!no_driver)
323		goto out;
324
325	/*
326	 * Check if we can dlopen() ourselves.  If this fails,
327	 * libibverbs is probably statically linked into the
328	 * executable, and we should just give up, since trying to
329	 * dlopen() a driver module will fail spectacularly (loading a
330	 * driver .so will bring in dynamic copies of libibverbs and
331	 * libdl to go along with the static copies the executable
332	 * has, which quickly leads to a crash.
333	 */
334	{
335		void *hand = dlopen(NULL, RTLD_NOW);
336		if (!hand) {
337			fprintf(stderr, PFX "Warning: dlopen(NULL) failed, "
338				"assuming static linking.\n");
339			statically_linked = 1;
340			goto out;
341		}
342		dlclose(hand);
343	}
344
345	for (sysfs_dev = sysfs_dev_list; sysfs_dev; sysfs_dev = sysfs_dev->next) {
346		if (sysfs_dev->have_driver)
347			continue;
348
349		device = try_drivers(sysfs_dev);
350		if (device) {
351			add_device(device, list, &num_devices, &list_size);
352			sysfs_dev->have_driver = 1;
353		}
354	}
355
356out:
357	for (sysfs_dev = sysfs_dev_list,
358		     next_dev = sysfs_dev ? sysfs_dev->next : NULL;
359	     sysfs_dev;
360	     sysfs_dev = next_dev, next_dev = sysfs_dev ? sysfs_dev->next : NULL) {
361		if (!sysfs_dev->have_driver && getenv("IBV_SHOW_WARNINGS")) {
362			fprintf(stderr, PFX "Warning: no userspace device-specific "
363				"driver found for %s\n", sysfs_dev->sysfs_path);
364			if (statically_linked)
365				fprintf(stderr, "	When linking libibverbs statically, "
366					"driver must be statically linked too.\n");
367		}
368		free(sysfs_dev);
369	}
370
371	return num_devices;
372}
373