Query XDP_OPTIONS in libbpf to determine if the zero-copy mode is active
or not.
Signed-off-by: Maxim Mikityanskiy <maximmi@xxxxxxxxxxxx>
Acked-by: Saeed Mahameed <saeedm@xxxxxxxxxxxx>
---
tools/lib/bpf/xsk.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c
index 38667b62f1fe..bedd747db81a 100644
--- a/tools/lib/bpf/xsk.c
+++ b/tools/lib/bpf/xsk.c
@@ -67,6 +67,7 @@ struct xsk_socket {
int xsks_map_fd;
__u32 queue_id;
char ifname[IFNAMSIZ];
+ bool zc;
};
struct xsk_nl_info {
@@ -527,6 +528,7 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname,
void *rx_map = NULL, *tx_map = NULL;
struct sockaddr_xdp sxdp = {};
struct xdp_mmap_offsets off;
+ struct xdp_options opts;
struct xsk_socket *xsk;
socklen_t optlen;
int err;
@@ -646,6 +648,15 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname,
xsk->qidconf_map_fd = -1;
xsk->xsks_map_fd = -1;
+ 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 (!(xsk->config.libbpf_flags & XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD)) {
err = xsk_setup_xdp_prog(xsk);
if (err)
--
2.19.1
