contrib/ofed/libibverbs/init.c

   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 }