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 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 } 133 134 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 } 155 156 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 } 208 209 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 } 222 223 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 } 244 245 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 } 262 263 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 } 280 281 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