tools lib bpf: Add missing BPF functions

Add more BPF map operations to libbpf. Also add bpf_obj_{pin,get}(). They
can be used on not only BPF maps but also BPF programs.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Cc: He Kuang <hekuang@huawei.com>
Cc: Joe Stringer <joe@ovn.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/20161126070354.141764-2-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 56 insertions, 0 deletions

diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index 4212ed62235b..8143536b462a 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -110,3 +110,59 @@ int bpf_map_update_elem(int fd, void *key, void *value,
 
         return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr));
 }
+
+int bpf_map_lookup_elem(int fd, void *key, void *value)
+{
+        union bpf_attr attr;
+
+        bzero(&attr, sizeof(attr));
+        attr.map_fd = fd;
+        attr.key = ptr_to_u64(key);
+        attr.value = ptr_to_u64(value);
+
+        return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
+}
+
+int bpf_map_delete_elem(int fd, void *key)
+{
+        union bpf_attr attr;
+
+        bzero(&attr, sizeof(attr));
+        attr.map_fd = fd;
+        attr.key = ptr_to_u64(key);
+
+        return sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr));
+}
+
+int bpf_map_get_next_key(int fd, void *key, void *next_key)
+{
+        union bpf_attr attr;
+
+        bzero(&attr, sizeof(attr));
+        attr.map_fd = fd;
+        attr.key = ptr_to_u64(key);
+        attr.next_key = ptr_to_u64(next_key);
+
+        return sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr));
+}
+
+int bpf_obj_pin(int fd, const char *pathname)
+{
+        union bpf_attr attr;
+
+        bzero(&attr, sizeof(attr));
+        attr.pathname = ptr_to_u64((void *)pathname);
+        attr.bpf_fd = fd;
+
+        return sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr));
+}
+
+int bpf_obj_get(const char *pathname)
+{
+        union bpf_attr attr;
+
+        bzero(&attr, sizeof(attr));
+        attr.pathname = ptr_to_u64((void *)pathname);
+
+        return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr));
+}