Add iperf3-based test to verify RX buffer handling under load.
Optionally logs page_pool tracepoints when available.
---
.../drivers/net/virtio_net/basic_features.sh | 70 +++++++++++++++++++
1 file changed, 70 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..c2c8023d2b92 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]}
+require_command iperf3
+
h1_create()
{
simple_if_init $h1 $H1_IPV4/24 $H1_IPV6/64
@@ -83,6 +86,73 @@ f_mac_test()
log_test "$test_name"
}
+buffer_circulation_test()
+{
+ RET=0
+ local test_name="buffer circulation"
+ local tracefs="/sys/kernel/tracing"
+
+ 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
+
+ iperf3 -s --bind-dev $h2 -p 5201 &>/dev/null &
+ local server_pid=$!
+ sleep 1
+
+ if ! kill -0 $server_pid 2>/dev/null; then
+ if [ -d "$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 $h1 -p 5201 -t 5 >/dev/null 2>&1
+ local iperf_ret=$?
+
+ kill $server_pid 2>/dev/null || true
+ wait $server_pid 2>/dev/null || true
+
+ if [ -d "$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
--
2.47.3
