[PATCHv3 net-next 5/5] selftests/net: add offload checking test for virtual interface

@@ -119,6 +119,7 @@ TEST_PROGS += tfo_passive.sh
 TEST_PROGS += broadcast_pmtu.sh
 TEST_PROGS += ipv6_force_forwarding.sh
 TEST_PROGS += route_hint.sh
+TEST_PROGS += vdev_offload.sh
 
 # YNL files, must be before "include ..lib.mk"
 YNL_GEN_FILES := busy_poller

@@ -128,3 +128,4 @@ CONFIG_NETKIT=y
 CONFIG_NET_PKTGEN=m
 CONFIG_IPV6_ILA=m
 CONFIG_IPV6_RPL_LWTUNNEL=y
+CONFIG_NET_TEAM=m

@@ -0,0 +1,137 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+# shellcheck disable=SC1091
+source lib.sh
+
+# Set related offload on lower deivces and check if upper device re-compute
+# Some features are fixed on veth interface. Just list here in case we have a
+# better way to test in future.
+set_offload()
+{
+	local dev="$1"
+	local state="$2"
+
+	# VLAN features
+	# NETIF_F_FRAGLIST: tx-scatter-gather-fraglist
+	# shellcheck disable=SC2154
+	ip netns exec "$ns" ethtool -K "$dev" tx-scatter-gather-fraglist "$state"
+
+	# ENC features
+	# NETIF_F_RXCSUM: rx-checksum (bond/team/bridge fixed)
+
+	# XFRM features (veth fixed, netdevsim supports)
+	# NETIF_F_HW_ESP: esp-hw-offload
+	# NETIF_F_GSO_ESP: tx-esp-segmentation
+
+	# GSO partial features
+	# NETIF_F_GSO_PARTIAL: tx-gso-partial (veth/bond fixed)
+
+	# Common features
+	# NETIF_F_SG: tx-scatter-gather
+	ip netns exec "$ns" ethtool -K "$dev" tx-scatter-gather "$state" &> /dev/null
+	# NETIF_F_GSO_SOFTWARE: NETIF_F_GSO_ACCECN: tx-tcp-accecn-segmentation
+	ip netns exec "$ns" ethtool -K "$dev" tx-tcp-accecn-segmentation "$state"
+	# NETIF_F_GSO_SOFTWARE: NETIF_F_GSO_SCTP: tx-sctp-segmentation
+	ip netns exec "$ns" ethtool -K "$dev" tx-sctp-segmentation "$state"
+	# NETIF_F_GSO_SOFTWARE: NETIF_F_GSO_FRAGLIST: tx-gso-list
+	ip netns exec "$ns" ethtool -K "$dev" tx-gso-list "$state"
+}
+
+__check_offload()
+{
+	local dev=$1
+	local opt=$2
+	local expect=$3
+
+	ip netns exec "$ns" ethtool --json -k "$dev" | \
+		jq -r -e ".[].\"$opt\".active == ${expect}" >/dev/null
+}
+
+check_offload()
+{
+	local dev=$1
+	local state=$2
+
+	__check_offload "$dev" "tx-scatter-gather-fraglist" "$state" || RET=1
+	__check_offload "$dev" "tx-scatter-gather" "$state" || RET=1
+	__check_offload "$dev" "tx-tcp-accecn-segmentation" "$state" || RET=1
+	__check_offload "$dev" "tx-sctp-segmentation" "$state" || RET=1
+	__check_offload "$dev" "tx-gso-list" "$state" || RET=1
+}
+
+setup_veth()
+{
+	# Set up test netns
+	setup_ns ns switch
+
+	# shellcheck disable=SC2154
+	ip -n "$ns" link add veth0 type veth peer name veth0 netns "$switch"
+	ip -n "$ns" link add veth1 type veth peer name veth1 netns "$switch"
+	ip -n "$switch" link set veth0 up
+	ip -n "$switch" link set veth1 up
+
+	link_0=veth0
+	link_1=veth1
+}
+
+cleanup()
+{
+	cleanup_all_ns
+}
+
+setup_bond()
+{
+	ip -n "$ns" link set "$link_0" nomaster
+	ip -n "$ns" link set "$link_1" nomaster
+	ip -n "$ns" link add bond0 type bond mode active-backup miimon 100
+	ip -n "$ns" link set "$link_0" master bond0
+	ip -n "$ns" link set "$link_1" master bond0
+	ip -n "$ns" link set bond0 up
+}
+
+setup_team()
+{
+	ip -n "$ns" link set "$link_0" nomaster
+	ip -n "$ns" link set "$link_1" nomaster
+	ip -n "$ns" link add team0 type team
+	ip -n "$ns" link set "$link_0" master team0
+	ip -n "$ns" link set "$link_1" master team0
+	ip -n "$ns" link set team0 up
+}
+
+setup_bridge()
+{
+	ip -n "$ns" link set "$link_0" nomaster
+	ip -n "$ns" link set "$link_1" nomaster
+	ip -n "$ns" link add br0 type bridge
+	ip -n "$ns" link set "$link_0" master br0
+	ip -n "$ns" link set "$link_1" master br0
+	ip -n "$ns" link set br0 up
+}
+
+do_test()
+{
+	local dev=$1
+
+	RET=0
+	set_offload veth0 "on"
+	set_offload veth1 "on"
+	check_offload "$dev" "true"
+	log_test "$dev" "enable offload"
+
+	RET=0
+	set_offload veth0 "off"
+	set_offload veth1 "off"
+	check_offload "$dev" "false"
+	log_test "$dev" "disable offload"
+}
+
+trap cleanup EXIT
+setup_veth
+setup_bond
+do_test bond0
+setup_team
+do_test team0
+setup_bridge
+do_test br0