[PATCH bpf-next 4/5] libbpf: add bpf_raw_tracepoint_open helper

From: Alexei Starovoitov
Date: Wed Feb 28 2018 - 23:20:54 EST


Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
---
tools/include/uapi/linux/bpf.h | 11 +++++++++++
tools/lib/bpf/bpf.c | 10 ++++++++++
tools/lib/bpf/bpf.h | 1 +
3 files changed, 22 insertions(+)

diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index db6bdc375126..50bf5f9054da 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -94,6 +94,7 @@ enum bpf_cmd {
BPF_MAP_GET_FD_BY_ID,
BPF_OBJ_GET_INFO_BY_FD,
BPF_PROG_QUERY,
+ BPF_RAW_TRACEPOINT_OPEN,
};

enum bpf_map_type {
@@ -133,6 +134,7 @@ enum bpf_prog_type {
BPF_PROG_TYPE_SOCK_OPS,
BPF_PROG_TYPE_SK_SKB,
BPF_PROG_TYPE_CGROUP_DEVICE,
+ BPF_PROG_TYPE_RAW_TRACEPOINT,
};

enum bpf_attach_type {
@@ -143,6 +145,7 @@ enum bpf_attach_type {
BPF_SK_SKB_STREAM_PARSER,
BPF_SK_SKB_STREAM_VERDICT,
BPF_CGROUP_DEVICE,
+ BPF_RAW_TRACEPOINT,
__MAX_BPF_ATTACH_TYPE
};

@@ -320,6 +323,10 @@ union bpf_attr {
__aligned_u64 prog_ids;
__u32 prog_cnt;
} query;
+
+ struct {
+ __u64 name;
+ } raw_tracepoint;
} __attribute__((aligned(8)));

/* BPF helper function descriptions:
@@ -1106,4 +1113,8 @@ struct bpf_cgroup_dev_ctx {
__u32 minor;
};

+struct bpf_raw_tracepoint_args {
+ __u64 args[0];
+};
+
#endif /* _UAPI__LINUX_BPF_H__ */
diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index 592a58a2b681..4cbe7b6afcc0 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -428,6 +428,16 @@ int bpf_obj_get_info_by_fd(int prog_fd, void *info, __u32 *info_len)
return err;
}

+int bpf_raw_tracepoint_open(const char *name)
+{
+ union bpf_attr attr;
+
+ bzero(&attr, sizeof(attr));
+ attr.raw_tracepoint.name = ptr_to_u64(name);
+
+ return sys_bpf(BPF_RAW_TRACEPOINT_OPEN, &attr, sizeof(attr));
+}
+
int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags)
{
struct sockaddr_nl sa;
diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
index 8d18fb73d7fb..f672d39bd9fa 100644
--- a/tools/lib/bpf/bpf.h
+++ b/tools/lib/bpf/bpf.h
@@ -79,4 +79,5 @@ int bpf_map_get_fd_by_id(__u32 id);
int bpf_obj_get_info_by_fd(int prog_fd, void *info, __u32 *info_len);
int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags,
__u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt);
+int bpf_raw_tracepoint_open(const char *name);
#endif
--
2.9.5