In current ping-pong design, xdp_hw_metadata will wait until the packet transmition completely done, then only start to receive the next packet.
The current sleep interval is 10ms, which is unnecessary large. Typically, a NIC does not need such a long time to transmit a packet. Furthermore, during this 10ms sleep time, the app is unable to receive incoming packets.
Therefore, this commit reduce sleep interval to 10us, so that xdp_hw_metadata able to support periodic packets with shorter interval. 10us * 500 = 5ms should be enough for packet transmission and status retrival.
Signed-off-by: Song Yoong Siang yoong.siang.song@intel.com Acked-by: John Fastabend john.fastabend@gmail.com Acked-by: Stanislav Fomichev sdf@google.com --- tools/testing/selftests/bpf/xdp_hw_metadata.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/testing/selftests/bpf/xdp_hw_metadata.c b/tools/testing/selftests/bpf/xdp_hw_metadata.c index 878d68db0325..bdf5d8180067 100644 --- a/tools/testing/selftests/bpf/xdp_hw_metadata.c +++ b/tools/testing/selftests/bpf/xdp_hw_metadata.c @@ -480,7 +480,7 @@ static int verify_metadata(struct xsk *rx_xsk, int rxq, int server_fd, clockid_t for (int j = 0; j < 500; j++) { if (complete_tx(xsk, clock_id)) break; - usleep(10*1000); + usleep(10); } } }