On Wed, Feb 04, 2026 at 11:36:17AM -0800, Vishwanath Seshagiri wrote: > Add iperf3-based test to verify RX buffer handling under load. > Optionally logs page_pool tracepoints when available.
but it doesn't verify/validate them - it's just a generic throughput test. so what is the value add here? > 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
