Add iperf3-based test to verify RX buffer handling under load. Optionally logs page_pool tracepoints when available.
Signed-off-by: Vishwanath Seshagiri <[email protected]> --- .../drivers/net/virtio_net/basic_features.sh | 86 +++++++++++++++++++ 1 file changed, 86 insertions(+) diff --git a/tools/testing/selftests/drivers/net/virtio_net/basic_features.sh b/tools/testing/selftests/drivers/net/virtio_net/basic_features.sh index cf8cf816ed48..fa98505c4674 100755 --- a/tools/testing/selftests/drivers/net/virtio_net/basic_features.sh +++ b/tools/testing/selftests/drivers/net/virtio_net/basic_features.sh @@ -6,6 +6,7 @@ ALL_TESTS=" initial_ping_test f_mac_test + buffer_circulation_test " source virtio_net_common.sh @@ -16,6 +17,8 @@ source "$lib_dir"/../../../net/forwarding/lib.sh h1=${NETIFS[p1]} h2=${NETIFS[p2]} +IPERF_SERVER_PID="" + h1_create() { simple_if_init $h1 $H1_IPV4/24 $H1_IPV6/64 @@ -83,6 +86,84 @@ f_mac_test() log_test "$test_name" } +buffer_circulation_test() +{ + RET=0 + local test_name="buffer circulation" + local tracefs="/sys/kernel/tracing" + + if ! check_command iperf3; then + log_test_skip "$test_name" "iperf3 not installed" + return 0 + fi + + setup_cleanup + setup_prepare + + ping -c 1 -I "$h1" "$H2_IPV4" >/dev/null + if [ $? -ne 0 ]; then + check_err 1 "Ping failed" + log_test "$test_name" + return + fi + + local rx_start=$(cat /sys/class/net/"$h2"/statistics/rx_packets) + local tx_start=$(cat /sys/class/net/"$h1"/statistics/tx_packets) + + if [ -d "$tracefs/events/page_pool" ]; then + echo > "$tracefs/trace" + echo 1 > "$tracefs/events/page_pool/enable" + fi + + local port=$(shuf -i 49152-65535 -n 1) + + iperf3 -s -1 --bind-dev "$h2" -p "$port" &>/dev/null & + IPERF_SERVER_PID=$! + sleep 1 + + if ! kill -0 "$IPERF_SERVER_PID" 2>/dev/null; then + IPERF_SERVER_PID="" + if [ -d "$tracefs/events/page_pool" ]; then + echo 0 > "$tracefs/events/page_pool/enable" + fi + check_err 1 "iperf3 server died" + log_test "$test_name" + return + fi + + iperf3 -c "$H2_IPV4" --bind-dev "$h1" -p "$port" -t 5 >/dev/null 2>&1 + local iperf_ret=$? + + if [ -n "$IPERF_SERVER_PID" ]; then + kill "$IPERF_SERVER_PID" 2>/dev/null || true + wait "$IPERF_SERVER_PID" 2>/dev/null || true + IPERF_SERVER_PID="" + fi + + if [ -d "$tracefs/events/page_pool" ]; then + echo 0 > "$tracefs/events/page_pool/enable" + local trace="$tracefs/trace" + local hold=$(grep -c "page_pool_state_hold" "$trace" 2>/dev/null) + local release=$(grep -c "page_pool_state_release" "$trace" 2>/dev/null) + log_info "page_pool events: hold=${hold:-0}, release=${release:-0}" + fi + + local rx_end=$(cat /sys/class/net/"$h2"/statistics/rx_packets) + local tx_end=$(cat /sys/class/net/"$h1"/statistics/tx_packets) + local rx_delta=$((rx_end - rx_start)) + local tx_delta=$((tx_end - tx_start)) + + log_info "Circulated TX:$tx_delta RX:$rx_delta" + + if [ "$iperf_ret" -ne 0 ]; then + check_err 1 "iperf3 failed" + elif [ "$rx_delta" -lt 10000 ]; then + check_err 1 "Too few packets: $rx_delta" + fi + + log_test "$test_name" +} + setup_prepare() { virtio_device_rebind $h1 @@ -113,6 +194,11 @@ setup_cleanup() cleanup() { + if [ -n "$IPERF_SERVER_PID" ]; then + kill "$IPERF_SERVER_PID" 2>/dev/null || true + wait "$IPERF_SERVER_PID" 2>/dev/null || true + fi + pre_cleanup setup_cleanup } -- 2.47.3
