[PATCH bpf-next 3/4] libbpf: handle AF_XDP sockets created with XDP_DIRECT bind flag.
From: Sridhar Samudrala <sridhar.samudrala@intel.com>
Date: 2019-10-08 06:16:59
Also in:
bpf, intel-wired-lan
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [library] (libbpf), the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Linus Torvalds
Don't allow an AF_XDP socket trying to bind with XDP_DIRECT bind flag when a normal XDP program is already attached to the device, Don't attach the default XDP program when AF_XDP socket is created with XDP_DIRECT bind flag. Signed-off-by: Sridhar Samudrala <sridhar.samudrala@intel.com> --- tools/lib/bpf/xsk.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c
index d5f4900e5c54..953b479040cd 100644
--- a/tools/lib/bpf/xsk.c
+++ b/tools/lib/bpf/xsk.c@@ -454,6 +454,9 @@ static int xsk_setup_xdp_prog(struct xsk_socket *xsk) return err; if (!prog_id) { + if (xsk->config.bind_flags & XDP_DIRECT) + return 0; + err = xsk_create_bpf_maps(xsk); if (err) return err;
@@ -464,6 +467,9 @@ static int xsk_setup_xdp_prog(struct xsk_socket *xsk) return err; } } else { + if (xsk->config.bind_flags & XDP_DIRECT) + return -EEXIST; + xsk->prog_fd = bpf_prog_get_fd_by_id(prog_id); err = xsk_lookup_bpf_maps(xsk); if (err) {
--
2.14.5