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-rw-r--r--samples/bpf/xdpsock_user.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c
index 4cead341ae57..b6175cb9a31d 100644
--- a/samples/bpf/xdpsock_user.c
+++ b/samples/bpf/xdpsock_user.c
@@ -897,6 +897,14 @@ static inline void complete_tx_l2fwd(struct xsk_socket_info *xsk,
if (!xsk->outstanding_tx)
return;
+ /* In copy mode, Tx is driven by a syscall so we need to use e.g. sendto() to
+ * really send the packets. In zero-copy mode we do not have to do this, since Tx
+ * is driven by the NAPI loop. So as an optimization, we do not have to call
+ * sendto() all the time in zero-copy mode for l2fwd.
+ */
+ if (opt_xdp_bind_flags & XDP_COPY)
+ kick_tx(xsk);
+
ndescs = (xsk->outstanding_tx > opt_batch_size) ? opt_batch_size :
xsk->outstanding_tx;