The xsk_socket__create() function fails and returns an error if it cannot
get the XDP_OPTIONS through getsockopt(). However, support for XDP_OPTIONS
was not added until kernel 5.3, so this means that creating XSK sockets
always fails on older kernels.
Since the option is just used to set the zero-copy flag in the xsk struct,
there really is no need to error out if the getsockopt() call fails.
Signed-off-by: Toke Høiland-Jørgensen <toke@xxxxxxxxxx>
---
tools/lib/bpf/xsk.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c
index 680e63066cf3..598e487d9ce8 100644
--- a/tools/lib/bpf/xsk.c
+++ b/tools/lib/bpf/xsk.c
@@ -603,12 +603,8 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname,
optlen = sizeof(opts);
err = getsockopt(xsk->fd, SOL_XDP, XDP_OPTIONS, &opts, &optlen);
- if (err) {
- err = -errno;
- goto out_mmap_tx;
- }
-
- xsk->zc = opts.flags & XDP_OPTIONS_ZEROCOPY;
+ if (!err)
+ xsk->zc = opts.flags & XDP_OPTIONS_ZEROCOPY;
if (!(xsk->config.libbpf_flags & XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD)) {
err = xsk_setup_xdp_prog(xsk);
--
2.23.0
