list = ibv_get_device_list(&i);
if (list == NULL) {
assert(errno);
+ if (errno == ENOSYS) {
+ WARN("cannot list devices, is ib_uverbs loaded?");
+ return 0;
+ }
return -errno;
}
assert(i >= 0);
break;
}
if (attr_ctx == NULL) {
- if (err == 0)
- err = ENODEV;
ibv_free_device_list(list);
+ switch (err) {
+ case 0:
+ WARN("cannot access device, is mlx4_ib loaded?");
+ return 0;
+ case EINVAL:
+ WARN("cannot use device, are drivers up to date?");
+ return 0;
+ }
assert(err > 0);
return -err;
}