tree b8cb67b2922bdd88e43371158a0094fcf09129f3
parent 949abbe88436c000cc63fce2bdfeb48b7d06a7df
author Eric Leblond <eric@regit.org> 1517345702 +0100
committer Alexei Starovoitov <ast@kernel.org> 1517622828 -0800

libbpf: add error reporting in XDP

Parse netlink ext attribute to get the error message returned by
the card. Code is partially take from libnl.

We add netlink.h to the uapi include of tools. And we need to
avoid include of userspace netlink header to have a successful
build of sample so nlattr.h has a define to avoid
the inclusion. Using a direct define could have been an issue
as NLMSGERR_ATTR_MAX can change in the future.

We also define SOL_NETLINK if not defined to avoid to have to
copy socket.h for a fixed value.

Signed-off-by: Eric Leblond <eric@regit.org>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>