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bpf: libbpf: remove map name retry from bpf_create_map_xattr

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Instead, check for a newly created caps.name bpf_object capability.
If kernel doesn't support names, don't specify the attribute.

See commit 23499442c3 ("bpf: libbpf: retry map creation without
the name") for rationale.

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Stanislav Fomichev 2018-11-20 17:11:20 -08:00 committed by Daniel Borkmann
parent 47eff61777
commit 94cb310cfa
2 changed files with 3 additions and 11 deletions
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11
tools/lib/bpf/bpf.c
View File

@ -69,7 +69,6 @@ int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr)
{
__u32 name_len = create_attr->name ? strlen(create_attr->name) : 0;
union bpf_attr attr;
int ret;
memset(&attr, '\0', sizeof(attr));
@ -87,15 +86,7 @@ int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr)
attr.map_ifindex = create_attr->map_ifindex;
attr.inner_map_fd = create_attr->inner_map_fd;
ret = sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
if (ret < 0 && errno == EINVAL && create_attr->name) {
/* Retry the same syscall, but without the name.
* Pre v4.14 kernels don't support map names.
*/
memset(attr.map_name, 0, sizeof(attr.map_name));
return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
}
return ret;
return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
}
int bpf_create_map_node(enum bpf_map_type map_type, const char *name,

3
tools/lib/bpf/libbpf.c
View File

@ -1211,7 +1211,8 @@ bpf_object__create_maps(struct bpf_object *obj)
continue;
}
create_attr.name = map->name;
if (obj->caps.name)
create_attr.name = map->name;
create_attr.map_ifindex = map->map_ifindex;
create_attr.map_type = def->type;
create_attr.map_flags = def->map_flags;