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
54 int abi_ver;
55
56 struct 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
66 struct ibv_driver_name {
67 char *name;
68 struct ibv_driver_name *next;
69 };
70
71 struct ibv_driver {
72 const char *name;
73 verbs_driver_init_func verbs_init_func;
74 struct ibv_driver *next;
75 };
76
77 static struct ibv_sysfs_dev *sysfs_dev_list;
78 static struct ibv_driver_name *driver_name_list;
79 static struct ibv_driver *head_driver, *tail_driver;
80
find_sysfs_devs(void)81 static 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
verbs_register_driver(const char * name,verbs_driver_init_func verbs_init_func)134 void 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
try_driver(struct ibv_driver * driver,struct ibv_sysfs_dev * sysfs_dev)156 static 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
try_drivers(struct ibv_sysfs_dev * sysfs_dev)209 static 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
check_abi_version(const char * path)223 static 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
check_memlock_limit(void)245 static 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
add_device(struct ibv_device * dev,struct ibv_device *** dev_list,int * num_devices,int * list_size)263 static 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
ibverbs_init(struct ibv_device *** list)281 int 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
356 out:
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