[RFC net-next 6/7] selftests: net: Use the provided dpctl rather than the vswitchd for tests.

[Aaron Conole <aconole@redhat.com>]

The current pmtu test infrastucture requires an installed copy of the
ovs-vswitchd userspace.  This means that any automated or constrained
environments may not have the requisite tools to run the tests.  However,
the pmtu tests don't require any special classifier processing.  Indeed
they are only using the vswitchd in the most basic mode - as a NORMAL
switch.

However, the ovs-dpctl kernel utility can now program all the needed basic
flows to allow traffic to traverse the tunnels and provide support for at
least testing some basic pmtu scenarios.  More complicated flow pipelines
can be added to the internal ovs test infrastructure, but that is work for
the future.  For now, enable the most common cases - wide mega flows with
no other prerequisites.

Signed-off-by: Aaron Conole <aconole@redhat.com>
---
 tools/testing/selftests/net/pmtu.sh | 87 ++++++++++++++++++++++-------
 1 file changed, 67 insertions(+), 20 deletions(-)

diff --git a/tools/testing/selftests/net/pmtu.sh b/tools/testing/selftests/net/pmtu.sh
index cfc84958025a..7f4f35d88dcc 100755
--- a/tools/testing/selftests/net/pmtu.sh
+++ b/tools/testing/selftests/net/pmtu.sh
@@ -846,22 +846,73 @@ setup_ovs_vxlan_or_geneve() {
 	type="${1}"
 	a_addr="${2}"
 	b_addr="${3}"
+	dport="6081"
 
 	if [ "${type}" = "vxlan" ]; then
+		dport="4789"
 		opts="${opts} ttl 64 dstport 4789"
 		opts_b="local ${b_addr}"
 	fi
 
-	run_cmd ovs-vsctl add-port ovs_br0 ${type}_a -- \
-		set interface ${type}_a type=${type} \
-		options:remote_ip=${b_addr} options:key=1 options:csum=true || return 1
-
+	run_cmd python3 ./openvswitch/ovs-dpctl.py add-if ovs_br0 ${type}_a -t ${type}
 	run_cmd ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts} || return 1
 
 	run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b
 	run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b
 
+	run_cmd ip link set ${type}_a up
 	run_cmd ${ns_b} ip link set ${type}_b up
+
+	ports=$(python3 ./openvswitch/ovs-dpctl.py show)
+	br0_port=$(echo "$ports" | grep -E "\sovs_br0" | sed -e 's@port @@' | cut -d: -f1 | xargs)
+	type_a_port=$(echo "$ports" | grep ${type}_a | sed -e 's@port @@' | cut -d: -f1 | xargs)
+	veth_a_port=$(echo "$ports" | grep veth_A | sed -e 's@port @@' | cut -d: -f1 | xargs)
+
+	v4_a_tun="${prefix4}.${a_r1}.1"
+	v4_b_tun="${prefix4}.${b_r1}.1"
+
+	v6_a_tun="${prefix6}:${a_r1}::1"
+	v6_b_tun="${prefix6}:${b_r1}::1"
+
+	if [ "${v4_a_tun}" == "${a_addr}" ]; then
+		run_cmd python3 ./openvswitch/ovs-dpctl.py add-flow ovs_br0 \
+		    "recirc_id(0),in_port(${veth_a_port}),eth(),eth_type(0x0800),ipv4()" \
+		    "set(tunnel(tun_id=1,dst=${v4_b_tun},ttl=64,tp_dst=${dport},flags(df|csum))),${type_a_port}"
+		run_cmd python3 ./openvswitch/ovs-dpctl.py add-flow ovs_br0 \
+		    "recirc_id(0),in_port(${veth_a_port}),eth(),eth_type(0x86dd),ipv6()" \
+		    "set(tunnel(tun_id=1,dst=${v4_b_tun},ttl=64,tp_dst=${dport},flags(df|csum))),${type_a_port}"
+		run_cmd python3 ./openvswitch/ovs-dpctl.py add-flow ovs_br0 \
+		    "recirc_id(0),tunnel(tun_id=1,src=${v4_b_tun},dst=${v4_a_tun}),in_port(${type_a_port}),eth(),eth_type(0x0800),ipv4()" \
+		    "${veth_a_port}"
+		run_cmd python3 ./openvswitch/ovs-dpctl.py add-flow ovs_br0 \
+		    "recirc_id(0),tunnel(tun_id=1,src=${v4_b_tun},dst=${v4_a_tun}),in_port(${type_a_port}),eth(),eth_type(0x86dd),ipv6()" \
+		    "${veth_a_port}"
+		run_cmd python3 ./openvswitch/ovs-dpctl.py add-flow ovs_br0 \
+		    "recirc_id(0),tunnel(tun_id=1,src=${v4_b_tun},dst=${v4_a_tun}),in_port(${type_a_port}),eth(),eth_type(0x0806),arp()" \
+		    "${veth_a_port}"
+		run_cmd python3 ./openvswitch/ovs-dpctl.py add-flow ovs_br0 \
+		    "recirc_id(0),in_port(${veth_a_port}),eth(),eth_type(0x0806),arp(sip=${veth4_c_addr},tip=${tunnel4_b_addr})" \
+		    "set(tunnel(tun_id=1,dst=${v4_b_tun},ttl=64,tp_dst=${dport},flags(df|csum))),${type_a_port}"
+	else
+		run_cmd python3 ./openvswitch/ovs-dpctl.py add-flow ovs_br0 \
+		    "recirc_id(0),in_port(${veth_a_port}),eth(),eth_type(0x0800),ipv4()" \
+		    "set(tunnel(tun_id=1,ipv6_dst=${v6_b_tun},ttl=64,tp_dst=${dport},flags(df|csum))),${type_a_port}"
+		run_cmd python3 ./openvswitch/ovs-dpctl.py add-flow ovs_br0 \
+		    "recirc_id(0),in_port(${veth_a_port}),eth(),eth_type(0x86dd),ipv6()" \
+		    "set(tunnel(tun_id=1,ipv6_dst=${v6_b_tun},ttl=64,tp_dst=${dport},flags(df|csum))),${type_a_port}"
+		run_cmd python3 ./openvswitch/ovs-dpctl.py add-flow ovs_br0 \
+		    "recirc_id(0),tunnel(tun_id=1,ipv6_src=${v6_b_tun},ipv6_dst=${v6_a_tun}),in_port(${type_a_port}),eth(),eth_type(0x0800),ipv4()" \
+		    "${veth_a_port}"
+		run_cmd python3 ./openvswitch/ovs-dpctl.py add-flow ovs_br0 \
+		    "recirc_id(0),tunnel(tun_id=1,ipv6_src=${v6_b_tun},ipv6_dst=${v6_a_tun}),in_port(${type_a_port}),eth(),eth_type(0x86dd),ipv6()" \
+		    "${veth_a_port}"
+		run_cmd python3 ./openvswitch/ovs-dpctl.py add-flow ovs_br0 \
+		    "recirc_id(0),tunnel(tun_id=1,ipv6_src=${v6_b_tun},ipv6_dst=${v6_a_tun}),in_port(${type_a_port}),eth(),eth_type(0x0806),arp()" \
+		    "${veth_a_port}"
+		run_cmd python3 ./openvswitch/ovs-dpctl.py add-flow ovs_br0 \
+		    "recirc_id(0),in_port(${veth_a_port}),eth(),eth_type(0x0806),arp(sip=${veth4_c_addr},tip=${tunnel4_b_addr})" \
+		    "set(tunnel(tun_id=1,ipv6_dst=${v6_b_tun},ttl=64,tp_dst=${dport},flags(df|csum))),${type_a_port}"
+	fi
 }
 
 setup_ovs_geneve4() {
@@ -881,7 +932,7 @@ setup_ovs_vxlan6() {
 }
 
 setup_ovs_bridge() {
-	run_cmd ovs-vsctl add-br ovs_br0 || return $ksft_skip
+	run_cmd python3 ./openvswitch/ovs-dpctl.py add-dp ovs_br0 || return $ksft_skip
 	run_cmd ip link set ovs_br0 up
 
 	run_cmd ${ns_c} ip link add veth_C-A type veth peer name veth_A-C
@@ -891,7 +942,7 @@ setup_ovs_bridge() {
 	run_cmd ${ns_c} ip link set veth_C-A up
 	run_cmd ${ns_c} ip addr add ${veth4_c_addr}/${veth4_mask} dev veth_C-A
 	run_cmd ${ns_c} ip addr add ${veth6_c_addr}/${veth6_mask} dev veth_C-A
-	run_cmd ovs-vsctl add-port ovs_br0 veth_A-C
+	run_cmd python3 ./openvswitch/ovs-dpctl.py add-if ovs_br0 veth_A-C
 
 	# Move veth_A-R1 to init
 	run_cmd ${ns_a} ip link set veth_A-R1 netns 1
@@ -942,8 +993,10 @@ cleanup() {
 
 	ip link del veth_A-C			2>/dev/null
 	ip link del veth_A-R1			2>/dev/null
-	ovs-vsctl --if-exists del-port vxlan_a	2>/dev/null
-	ovs-vsctl --if-exists del-br ovs_br0	2>/dev/null
+	# squelch the output of the del-if commands since it can be wordy
+	python3 ./openvswitch/ovs-dpctl.py del-if ovs_br0 -d true vxlan_a	>/dev/null	2>&1
+	python3 ./openvswitch/ovs-dpctl.py del-if ovs_br0 -d true geneve_a	>/dev/null	2>&1
+	python3 ./openvswitch/ovs-dpctl.py del-dp ovs_br0 >/dev/null	2>&1
 	rm -f "$tmpoutfile"
 }
 
@@ -1407,16 +1460,10 @@ test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception() {
 		exp_mtu=$((${ll_mtu} - 40          - 8          - 8                   - 14))
 	fi
 
-	if [ "${type}" = "vxlan" ]; then
-		tun_a="vxlan_sys_4789"
-	elif [ "${type}" = "geneve" ]; then
-		tun_a="genev_sys_6081"
-	fi
-
-	trace ""        "${tun_a}"  "${ns_b}"  ${type}_b \
-	      ""        veth_A-R1   "${ns_r1}" veth_R1-A \
-	      "${ns_b}" veth_B-R1   "${ns_r1}" veth_R1-B \
-	      ""        ovs_br0     ""         veth-A-C  \
+	trace ""        "${type}_a"  "${ns_b}"  ${type}_b \
+	      ""        veth_A-R1    "${ns_r1}" veth_R1-A \
+	      "${ns_b}" veth_B-R1    "${ns_r1}" veth_R1-B \
+	      ""        ovs_br0      ""         veth-A_C  \
 	      "${ns_c}" veth_C-A
 
 	if [ ${family} -eq 4 ]; then
@@ -1436,8 +1483,8 @@ test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception() {
 	mtu "${ns_b}"  veth_B-R1 ${ll_mtu}
 	mtu "${ns_r1}" veth_R1-B ${ll_mtu}
 
-	mtu ""        ${tun_a}  $((${ll_mtu} + 1000))
-	mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000))
+	mtu ""        ${type}_a  $((${ll_mtu} + 1000))
+	mtu "${ns_b}" ${type}_b  $((${ll_mtu} + 1000))
 
 	run_cmd ${ns_c} ${ping} -q -M want -i 0.1 -c 20 -s $((${ll_mtu} + 500)) ${dst} || return 1
 
-- 
2.45.1