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Thu, 26 Feb 2026 15:17:12 -0500 (EST) From: Alice Mikityanska To: Daniel Borkmann , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Xin Long , Willem de Bruijn , David Ahern , Nikolay Aleksandrov Cc: Shuah Khan , Stanislav Fomichev , Andrew Lunn , Simon Horman , Florian Westphal , netdev@vger.kernel.org, Alice Mikityanska Subject: [PATCH net-next v2 12/12] selftests: net: Add a test for BIG TCP in UDP tunnels Date: Thu, 26 Feb 2026 22:16:00 +0200 Message-ID: <20260226201600.222044-13-alice.kernel@fastmail.im> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260226201600.222044-1-alice.kernel@fastmail.im> References: <20260226201600.222044-1-alice.kernel@fastmail.im> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Alice Mikityanska The test sets up VXLAN and GENEVE tunnels over IPv4 and IPv6 and runs IPv4 and IPv6 traffic through them with BIG TCP enabled. It checks that a non-negligible amount of big aggregated packets are seen in tcpdump. Signed-off-by: Alice Mikityanska --- tools/testing/selftests/net/Makefile | 1 + .../testing/selftests/net/big_tcp_tunnels.sh | 145 ++++++++++++++++++ 2 files changed, 146 insertions(+) create mode 100755 tools/testing/selftests/net/big_tcp_tunnels.sh diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile index e97c90886f34..0134fa84fc2c 100644 --- a/tools/testing/selftests/net/Makefile +++ b/tools/testing/selftests/net/Makefile @@ -13,6 +13,7 @@ TEST_PROGS := \ arp_ndisc_untracked_subnets.sh \ bareudp.sh \ big_tcp.sh \ + big_tcp_tunnels.sh \ bind_bhash.sh \ bpf_offload.py \ broadcast_ether_dst.sh \ diff --git a/tools/testing/selftests/net/big_tcp_tunnels.sh b/tools/testing/selftests/net/big_tcp_tunnels.sh new file mode 100755 index 000000000000..6896bf36ee00 --- /dev/null +++ b/tools/testing/selftests/net/big_tcp_tunnels.sh @@ -0,0 +1,145 @@ +#!/usr/bin/env bash +# SPDX-License-Identifier: GPL-2.0 +# +# Testing for IPv4 and IPv6 BIG TCP over VXLAN and GENEVE tunnels. + +SERVER_NS=$(mktemp -u server-XXXXXXXX) +SERVER_IP4="192.168.1.1" +SERVER_IP6="2001:db8::1:1" +SERVER_IP4_TUN="192.168.2.1" +SERVER_IP6_TUN="2001:db8::2:1" + +CLIENT_NS=$(mktemp -u client-XXXXXXXX) +CLIENT_IP4="192.168.1.2" +CLIENT_IP6="2001:db8::1:2" +CLIENT_IP4_TUN="192.168.2.2" +CLIENT_IP6_TUN="2001:db8::2:2" + +PACKETS_THRESHOLD=10000 + +# Kselftest framework requirement - SKIP code is 4. +ksft_skip=4 + +setup() { + ip netns add "$SERVER_NS" + ip netns add "$CLIENT_NS" + ip -netns "$SERVER_NS" link add link1 type veth peer name link0 netns "$CLIENT_NS" + + ip -netns "$CLIENT_NS" link set link0 up + ip -netns "$CLIENT_NS" addr replace "$CLIENT_IP4/24" dev link0 + ip -netns "$CLIENT_NS" addr replace "$CLIENT_IP6/112" dev link0 nodad + ip -netns "$CLIENT_NS" link set link0 \ + gso_max_size 196608 gso_ipv4_max_size 196608 \ + gro_max_size 196608 gro_ipv4_max_size 196608 + ip -netns "$SERVER_NS" link set link1 up + ip -netns "$SERVER_NS" addr replace "$SERVER_IP4/24" dev link1 + ip -netns "$SERVER_NS" addr replace "$SERVER_IP6/112" dev link1 nodad + ip -netns "$SERVER_NS" link set link1 \ + gso_max_size 196608 gso_ipv4_max_size 196608 \ + gro_max_size 196608 gro_ipv4_max_size 196608 + + ip netns exec "$SERVER_NS" netserver 2>&1 >/dev/null +} + +setup_tunnel() { + if [ "$2" = 4 ]; then + SERVER_IP="$SERVER_IP4" + CLIENT_IP="$CLIENT_IP4" + echo "Setting up ${1^^} over IPv4" + else + SERVER_IP="$SERVER_IP6" + CLIENT_IP="$CLIENT_IP6" + echo "Setting up ${1^^} over IPv6" + fi + + if [ "$1" = vxlan ]; then + ip -netns "$CLIENT_NS" link add tun0 type vxlan \ + id 5001 remote "$SERVER_IP" local "$CLIENT_IP" dev link0 dstport 4789 + else + ip -netns "$CLIENT_NS" link add tun0 type geneve \ + id 5001 remote "$SERVER_IP" + fi + ip -netns "$CLIENT_NS" link set tun0 up + ip -netns "$CLIENT_NS" addr replace "$CLIENT_IP4_TUN/24" dev tun0 + ip -netns "$CLIENT_NS" addr replace "$CLIENT_IP6_TUN/112" dev tun0 nodad + ip -netns "$CLIENT_NS" link set tun0 \ + gso_max_size 196608 gso_ipv4_max_size 196608 \ + gro_max_size 196608 gro_ipv4_max_size 196608 + if [ "$1" = vxlan ]; then + ip -netns "$SERVER_NS" link add tun1 type vxlan \ + id 5001 remote "$CLIENT_IP" local "$SERVER_IP" dev link1 dstport 4789 + else + ip -netns "$SERVER_NS" link add tun1 type geneve \ + id 5001 remote "$CLIENT_IP" + fi + ip -netns "$SERVER_NS" link set tun1 up + ip -netns "$SERVER_NS" addr replace "$SERVER_IP4_TUN/24" dev tun1 + ip -netns "$SERVER_NS" addr replace "$SERVER_IP6_TUN/112" dev tun1 nodad + ip -netns "$SERVER_NS" link set tun1 \ + gso_max_size 196608 gso_ipv4_max_size 196608 \ + gro_max_size 196608 gro_ipv4_max_size 196608 +} + +cleanup_tunnel() { + ip -netns "$CLIENT_NS" link del tun0 + ip -netns "$SERVER_NS" link del tun1 +} + +cleanup() { + ip netns exec "$SERVER_NS" killall netserver + ip netns del "$SERVER_NS" + ip netns del "$CLIENT_NS" +} + +do_test() { + exec 3< <(ip netns exec "$SERVER_NS" tcpdump -nn -i link1 greater 65536 2> /dev/null) + TCPDUMP_SERVER_PID="$!" + exec 4< <(wc -l <&3) + exec 5< <(ip netns exec "$CLIENT_NS" tcpdump -nn -i link0 greater 65536 2> /dev/null) + TCPDUMP_CLIENT_PID="$!" + exec 6< <(wc -l <&5) + + if [ "$1" = 4 ]; then + SERVER_IP="$SERVER_IP4_TUN" + echo "Running IPv4 traffic in the tunnel" + else + SERVER_IP="$SERVER_IP6_TUN" + echo "Running IPv6 traffic in the tunnel" + fi + + ip netns exec "$CLIENT_NS" netperf -t TCP_STREAM -l 5 -H "$SERVER_IP" -- \ + -r 80000:80000 > /dev/null + kill "$TCPDUMP_SERVER_PID" "$TCPDUMP_CLIENT_PID" + wait "$TCPDUMP_SERVER_PID" "$TCPDUMP_CLIENT_PID" + PACKETS_SERVER=$(cat <&4) + PACKETS_CLIENT=$(cat <&6) + exec 3>&- 4>&- 5>&- 6>&- + + # One line is empty, each packet is two lines (inner and outer). + echo "Captured BIG TCP GRO packets: $(((PACKETS_SERVER - 1) / 2))" + echo "Captured BIG TCP GSO packets: $(((PACKETS_CLIENT - 1) / 2))" + [ "$PACKETS_SERVER" -gt "$(( PACKETS_THRESHOLD * 2 + 1))" ] || return 1 + [ "$PACKETS_CLIENT" -gt "$(( PACKETS_THRESHOLD * 2 + 1))" ] || return 1 +} + +if ! netperf -V &> /dev/null; then + echo "SKIP: Could not run test without netperf tool" + exit "$ksft_skip" +fi + +if ! ip link help 2>&1 | grep gso_ipv4_max_size &> /dev/null; then + echo "SKIP: Could not run test without gso/gro_ipv4_max_size supported in ip-link" + exit "$ksft_skip" +fi + +trap cleanup EXIT +setup +for tunnel in vxlan geneve; do + for tun_family in 4 6; do + for traffic_family in 4 6; do + setup_tunnel "$tunnel" "$tun_family" || exit "$?" + do_test "$traffic_family" || exit "$?" + cleanup_tunnel + done + done +done -- 2.52.0