HIDDEN int ibverbs_init(struct ibv_device ***list)
{
const char *sysfs_path;
struct ibv_sysfs_dev *sysfs_dev, *next_dev;
struct ibv_device *device;
int num_devices = 0;
int list_size = 0;
int statically_linked = 0;
int no_driver = 0;
int ret;
*list = NULL;
if (getenv("RDMAV_FORK_SAFE") || getenv("IBV_FORK_SAFE"))
if (ibv_fork_init())
fprintf(stderr, PFX "Warning: fork()-safety requested "
"but init failed\n");
sysfs_path = ibv_get_sysfs_path();
if (!sysfs_path)
return -ENOSYS;
ret = check_abi_version(sysfs_path);
if (ret)
return -ret;
check_memlock_limit();
read_config();
ret = vib_find_sysfs_devs();
if (ret)
return -ret;
for (sysfs_dev = sysfs_dev_list; sysfs_dev; sysfs_dev = sysfs_dev->next) {
device = try_drivers(sysfs_dev);
if (device) {
add_device(device, list, &num_devices, &list_size);
sysfs_dev->have_driver = 1;
} else
no_driver = 1;
}
if (!no_driver)
goto out;
/*
* Check if we can dlopen() ourselves. If this fails,
* libibverbs is probably statically linked into the
* executable, and we should just give up, since trying to
* dlopen() a driver module will fail spectacularly (loading a
* driver .so will bring in dynamic copies of libibverbs and
* libdl to go along with the static copies the executable
* has, which quickly leads to a crash.
*/
{
void *hand = dlopen(NULL, RTLD_NOW);
if (!hand) {
fprintf(stderr, PFX "Warning: dlopen(NULL) failed, "
"assuming static linking.\n");
statically_linked = 1;
goto out;
}
dlclose(hand);
}
load_drivers();
for (sysfs_dev = sysfs_dev_list; sysfs_dev; sysfs_dev = sysfs_dev->next) {
if (sysfs_dev->have_driver)
continue;
device = try_drivers(sysfs_dev);
if (device) {
add_device(device, list, &num_devices, &list_size);
sysfs_dev->have_driver = 1;
}
}
out:
for (sysfs_dev = sysfs_dev_list,
next_dev = sysfs_dev ? sysfs_dev->next : NULL;
sysfs_dev;
sysfs_dev = next_dev, next_dev = sysfs_dev ? sysfs_dev->next : NULL) {
if (!sysfs_dev->have_driver) {
fprintf(stderr, PFX "Warning: no userspace device-specific "
"driver found for %s\n", sysfs_dev->sysfs_path);
if (statically_linked)
fprintf(stderr, " When linking libibverbs statically, "
"driver must be statically linked too.\n");
}
free(sysfs_dev);
}
return num_devices;
}
static int ucma_init(void)
{
struct ibv_device **dev_list = NULL;
struct cma_device *cma_dev;
struct ibv_device_attr attr;
int i, ret, dev_cnt;
pthread_mutex_lock(&mut);
if (cma_dev_cnt) {
pthread_mutex_unlock(&mut);
return 0;
}
ret = check_abi_version();
if (ret)
goto err1;
dev_list = ibv_get_device_list(&dev_cnt);
if (!dev_list) {
printf("CMA: unable to get RDMA device list\n");
ret = ERR(ENODEV);
goto err1;
}
cma_dev_array = malloc(sizeof *cma_dev * dev_cnt);
if (!cma_dev_array) {
ret = ERR(ENOMEM);
goto err2;
}
for (i = 0; dev_list[i];) {
cma_dev = &cma_dev_array[i];
cma_dev->guid = ibv_get_device_guid(dev_list[i]);
cma_dev->verbs = ibv_open_device(dev_list[i]);
if (!cma_dev->verbs) {
printf("CMA: unable to open RDMA device\n");
ret = ERR(ENODEV);
goto err3;
}
i++;
ret = ibv_query_device(cma_dev->verbs, &attr);
if (ret) {
printf("CMA: unable to query RDMA device\n");
goto err3;
}
cma_dev->port_cnt = attr.phys_port_cnt;
cma_dev->max_initiator_depth = (uint8_t) attr.max_qp_init_rd_atom;
cma_dev->max_responder_resources = (uint8_t) attr.max_qp_rd_atom;
}
cma_dev_cnt = dev_cnt;
pthread_mutex_unlock(&mut);
ibv_free_device_list(dev_list);
return 0;
err3:
while (i--)
ibv_close_device(cma_dev_array[i].verbs);
free(cma_dev_array);
err2:
ibv_free_device_list(dev_list);
err1:
pthread_mutex_unlock(&mut);
return ret;
}