Commit c017800af5c7 for kernel

commit c017800af5c71ebb2e6209eebf5c60c19850ffe7
Author: Tianyi Gao <tianyi@cloudflare.com>
Date:   Tue Oct 6 18:32:37 2026 +0100

    selftests: net: veth: test peer ndo-xmit after GRO toggle while down

    Test that toggling GRO on a veth device while it is down updates the
    peer's ndo-xmit XDP feature once the device comes up, for both GRO on
    and GRO off.

    xdp-features is only visible through netlink, so read it with the ynl
    CLI, as double_udp_encap.sh does. Skip the checks if the CLI is not
    found, as in an installed kselftest tree.

    Signed-off-by: Tianyi Gao <tianyi@cloudflare.com>
    Link: https://patch.msgid.link/20261006173241.65945-3-tianyi@cloudflare.com
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/net/veth.sh b/tools/testing/selftests/net/veth.sh
index 9709dd067c72..8b867e0675a7 100755
--- a/tools/testing/selftests/net/veth.sh
+++ b/tools/testing/selftests/net/veth.sh
@@ -9,6 +9,8 @@ readonly DST=1
 readonly DST_NAT=100
 readonly NS_SRC=$BASE$SRC
 readonly NS_DST=$BASE$DST
+# shellcheck disable=SC2155 # prefer RO variable over return value from cmd
+readonly YNL="$(dirname "$(readlink -f "$0")")/../../../net/ynl/pyynl/cli.py"

 # "baremetal" network used for raw UDP traffic
 readonly BM_NET_V4=192.168.1.
@@ -74,6 +76,37 @@ chk_tso_flag() {
 	__chk_flag "$1" $2 $3 tcp-segmentation-offload
 }

+chk_xdp_feature() {
+	local msg="$1"
+	local target=$2
+	local expected=$3
+	local feature=$4
+	local ifindex
+	local out
+	local st
+	local flag
+
+	ifindex=`ip netns exec $BASE$target cat /sys/class/net/veth$target/ifindex`
+	out=`ip netns exec $BASE$target "$YNL" --family netdev --do dev-get \
+		--output-json --json "{\"ifindex\": $ifindex}" 2>&1`
+	st=$?
+
+	printf "%-60s" "$msg"
+	if [ $st -ne 0 ]; then
+		echo " fail - ynl cli error: $out"
+		ret=1
+		return
+	fi
+
+	flag=`echo "$out" | grep -c "\"$feature\""`
+	if [ "$flag" = "$expected" ]; then
+		echo " ok "
+	else
+		echo " fail - expected $expected found $flag"
+		ret=1
+	fi
+}
+
 chk_channels() {
 	local msg="$1"
 	local target=$2
@@ -222,6 +255,7 @@ fi

 [ $CPUS -lt 2 ] && echo "Only one CPU available, some tests will be skipped"
 [ $STRESS -gt 0 -a $CPUS -lt 3 ] && echo " stress test will be skipped, too"
+[ ! -f "$YNL" ] && echo "ynl cli not found, ndo-xmit tests will be skipped"

 create_ns
 chk_gro_flag "default - gro flag" $SRC off
@@ -283,6 +317,18 @@ chk_gro_flag "        - peer gro flag" $SRC off
 chk_tso_flag "        - tso flag" $SRC on
 chk_tso_flag "        - peer tso flag" $DST on
 ip -n $NS_DST link set dev veth$DST up
+if [ -f "$YNL" ]; then
+	chk_xdp_feature "        - peer ndo-xmit" $SRC 1 ndo-xmit
+	# make sure the peer flag is set before disabling gro while down
+	ip netns exec $NS_DST ethtool -K veth$DST gro off
+	ip netns exec $NS_DST ethtool -K veth$DST gro on
+	chk_xdp_feature "        - peer ndo-xmit re-armed" $SRC 1 ndo-xmit
+	ip -n $NS_DST link set dev veth$DST down
+	ip netns exec $NS_DST ethtool -K veth$DST gro off
+	ip -n $NS_DST link set dev veth$DST up
+	chk_xdp_feature "        - peer ndo-xmit cleared" $SRC 0 ndo-xmit
+	ip netns exec $NS_DST ethtool -K veth$DST gro on
+fi
 ip netns exec $NS_SRC ethtool -K veth$SRC tx-udp-segmentation off
 ip netns exec $NS_DST ethtool -K veth$DST rx-udp-gro-forwarding on
 chk_gro "        - aggregation with TSO off" 1