Add bpf_map_lookup_elem(), bpf_map_delete_elem() and bpf_map_get_next_key()
to libbpf so it can issue all BPF map operations.
Signed-off-by: Wang Nan <wangn...@huawei.com>
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
---
v1 -> v2: Remove tailing whitespaces.
---
tools/lib/bpf/bpf.c | 32 ++++++++++++++++++++++++++++++++
tools/lib/bpf/bpf.h | 4 ++++
2 files changed, 36 insertions(+)
diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index e0dccea..b8e7aaa 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -97,3 +97,35 @@ 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 = {
+ .map_fd = fd,
+ .key = ptr_to_u64(key),
+ .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 = {
+ .map_fd = fd,
+ .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 = {
+ .map_fd = fd,
+ .key = ptr_to_u64(key),
+ .next_key = ptr_to_u64(next_key),
+ };
+
+ return sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr));
+}
diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
index 01a421a..3d22048 100644
--- a/tools/lib/bpf/bpf.h
+++ b/tools/lib/bpf/bpf.h
@@ -23,4 +23,8 @@ int bpf_load_program(enum bpf_prog_type type, const struct
bpf_insn *insns,
int bpf_map_update_elem(int fd, void *key, void *value,
__u64 flags);
+
+int bpf_map_lookup_elem(int fd, void *key, void *value);
+int bpf_map_delete_elem(int fd, void *key);
+int bpf_map_get_next_key(int fd, void *key, void *next_key);
#endif
--
1.8.3.4
--
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