[bpf-next,v6,08/23] libbpf: add map_get_fd_by_id and map_delete_elem in light skeleton

Commit Message

Benjamin Tissoires July 12, 2022, 2:58 p.m. UTC

This allows to have a better control over maps from the kernel when
preloading eBPF programs.

Signed-off-by: Benjamin Tissoires <[e-mail]>

---

no changes in v6

new in v5
---
 tools/lib/bpf/skel_internal.h | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

Comments

Yonghong Song July 16, 2022, 4:41 a.m. UTC | #1

On 7/12/22 7:58 AM, Benjamin Tissoires wrote:
> This allows to have a better control over maps from the kernel when
> preloading eBPF programs.
> 
> Signed-off-by: Benjamin Tissoires <[e-mail]>

Acked-by: Yonghong Song <[e-mail]>

Patch

diff --git a/tools/lib/bpf/skel_internal.h b/tools/lib/bpf/skel_internal.h
index bd6f4505e7b1..bc1db60ad744 100644
--- a/tools/lib/bpf/skel_internal.h
+++ b/tools/lib/bpf/skel_internal.h
@@ -251,6 +251,29 @@  static inline int skel_map_update_elem(int fd, const void *key,
 	return skel_sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, attr_sz);
 }
 
+static inline int skel_map_delete_elem(int fd, const void *key)
+{
+	const size_t attr_sz = offsetofend(union bpf_attr, flags);
+	union bpf_attr attr;
+
+	memset(&attr, 0, attr_sz);
+	attr.map_fd = fd;
+	attr.key = (long)key;
+
+	return skel_sys_bpf(BPF_MAP_DELETE_ELEM, &attr, attr_sz);
+}
+
+static inline int skel_map_get_fd_by_id(__u32 id)
+{
+	const size_t attr_sz = offsetofend(union bpf_attr, flags);
+	union bpf_attr attr;
+
+	memset(&attr, 0, attr_sz);
+	attr.map_id = id;
+
+	return skel_sys_bpf(BPF_MAP_GET_FD_BY_ID, &attr, attr_sz);
+}
+
 static inline int skel_raw_tracepoint_open(const char *name, int prog_fd)
 {
 	const size_t attr_sz = offsetofend(union bpf_attr, raw_tracepoint.prog_fd);