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libbpf: Add function to set link XDP fd while specifying old program

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This adds a new function to set the XDP fd while specifying the FD of the
program to replace, using the newly added IFLA_XDP_EXPECTED_FD netlink
parameter. The new function uses the opts struct mechanism to be extendable
in the future.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/158515700857.92963.7052131201257841700.stgit@toke.dk
This commit is contained in:
Toke Høiland-Jørgensen
2020-03-25 18:23:28 +01:00
committed by Alexei Starovoitov
parent 50a3e678b5
commit bd5ca3ef93
3 changed files with 42 additions and 1 deletions
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8
tools/lib/bpf/libbpf.h
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@ -444,7 +444,15 @@ struct xdp_link_info {
__u8 attach_mode;
};
struct bpf_xdp_set_link_opts {
size_t sz;
__u32 old_fd;
};
#define bpf_xdp_set_link_opts__last_field old_fd
LIBBPF_API int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags);
LIBBPF_API int bpf_set_link_xdp_fd_opts(int ifindex, int fd, __u32 flags,
const struct bpf_xdp_set_link_opts *opts);
LIBBPF_API int bpf_get_link_xdp_id(int ifindex, __u32 *prog_id, __u32 flags);
LIBBPF_API int bpf_get_link_xdp_info(int ifindex, struct xdp_link_info *info,
size_t info_size, __u32 flags);