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bpf: introduce bpf_xdp_get_buff_len helper

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Introduce bpf_xdp_get_buff_len helper in order to return the xdp buffer
total size (linear and paged area)

Acked-by: Toke Hoiland-Jorgensen <toke@redhat.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/aac9ac3504c84026cf66a3c71b7c5ae89bc991be.1642758637.git.lorenzo@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Lorenzo Bianconi
2022-01-21 11:09:54 +01:00
committed by Alexei Starovoitov
parent e121d27083
commit 0165cc8170
4 changed files with 43 additions and 0 deletions
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7
include/uapi/linux/bpf.h
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@@ -5054,6 +5054,12 @@ union bpf_attr {
* This helper is currently supported by cgroup programs only.
* Return
* 0 on success, or a negative error in case of failure.
*
* u64 bpf_xdp_get_buff_len(struct xdp_buff *xdp_md)
* Description
* Get the total size of a given xdp buff (linear and paged area)
* Return
* The total size of a given xdp buffer.
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@@ -5244,6 +5250,7 @@ union bpf_attr {
FN(get_func_arg_cnt), \
FN(get_retval), \
FN(set_retval), \
FN(xdp_get_buff_len), \
/* */
/* integer value in 'imm' field of BPF_CALL instruction selects which helper