new file mode 100755
@@ -0,0 +1,124 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0-only
+
+NSIM_DEV_1_ID=$((RANDOM % 1024))
+NSIM_DEV_1_SYS=/sys/bus/netdevsim/devices/netdevsim$NSIM_DEV_1_ID
+NSIM_DEV_1_DFS=/sys/kernel/debug/netdevsim/netdevsim$NSIM_DEV_1_ID
+NSIM_DEV_2_ID=$((RANDOM % 1024))
+NSIM_DEV_2_SYS=/sys/bus/netdevsim/devices/netdevsim$NSIM_DEV_2_ID
+NSIM_DEV_2_DFS=/sys/kernel/debug/netdevsim/netdevsim$NSIM_DEV_2_ID
+
+NSIM_DEV_SYS_NEW=/sys/bus/netdevsim/new_device
+NSIM_DEV_SYS_DEL=/sys/bus/netdevsim/del_device
+
+socat_check()
+{
+ if [ ! -x "$(command -v socat)" ]; then
+ echo "socat command not found. Skipping test"
+ return 1
+ fi
+
+ return 0
+}
+
+setup_ns()
+{
+ set -e
+ ip netns add nssv
+ ip netns add nscl
+
+ NSIM_DEV_1_NAME=$(find $NSIM_DEV_1_SYS/net -maxdepth 1 -type d ! \
+ -path $NSIM_DEV_1_SYS/net -exec basename {} \;)
+ NSIM_DEV_2_NAME=$(find $NSIM_DEV_2_SYS/net -maxdepth 1 -type d ! \
+ -path $NSIM_DEV_2_SYS/net -exec basename {} \;)
+
+ ip link set $NSIM_DEV_1_NAME netns nssv
+ ip link set $NSIM_DEV_2_NAME netns nscl
+
+ ip netns exec nssv ip addr add '192.168.1.1/24' dev $NSIM_DEV_1_NAME
+ ip netns exec nscl ip addr add '192.168.1.2/24' dev $NSIM_DEV_2_NAME
+
+ ip netns exec nssv ip link set dev $NSIM_DEV_1_NAME up
+ ip netns exec nscl ip link set dev $NSIM_DEV_2_NAME up
+ set +e
+}
+
+cleanup_ns()
+{
+ ip netns del nscl
+ ip netns del nssv
+}
+
+###
+### Code start
+###
+
+modprobe netdevsim
+
+# linking
+
+echo $NSIM_DEV_1_ID > $NSIM_DEV_SYS_NEW
+
+echo "$NSIM_DEV_2_ID 0" > ${NSIM_DEV_1_DFS}/ports/0/peer 2>/dev/null
+if [ $? -eq 0 ]; then
+ echo "linking with non-existent netdevsim should fail"
+ exit 1
+fi
+
+echo $NSIM_DEV_2_ID > $NSIM_DEV_SYS_NEW
+
+echo "$NSIM_DEV_2_ID 0" > ${NSIM_DEV_1_DFS}/ports/0/peer
+if [ $? -ne 0 ]; then
+ echo "linking netdevsim1 port0 with netdevsim2 port0 should succeed"
+ exit 1
+fi
+
+# argument error checking
+
+echo "$NSIM_DEV_2_ID 1" > ${NSIM_DEV_1_DFS}/ports/0/peer 2>/dev/null
+if [ $? -eq 0 ]; then
+ echo "linking with non-existent port in a netdevsim should fail"
+ exit 1
+fi
+
+echo "$NSIM_DEV_1_ID 0" > ${NSIM_DEV_1_DFS}/ports/0/peer 2>/dev/null
+if [ $? -eq 0 ]; then
+ echo "linking with self should fail"
+ exit 1
+fi
+
+echo "$NSIM_DEV_2_ID a" > ${NSIM_DEV_1_DFS}/ports/0/peer 2>/dev/null
+if [ $? -eq 0 ]; then
+ echo "invalid arg should fail"
+ exit 1
+fi
+
+# send/recv packets
+
+socat_check || exit 4
+
+setup_ns
+
+tmp_file=$(mktemp)
+ip netns exec nssv socat TCP-LISTEN:1234,fork $tmp_file &
+pid=$!
+res=0
+
+echo "HI" | ip netns exec nscl socat STDIN TCP:192.168.1.1:1234
+
+count=$(cat $tmp_file | wc -c)
+if [[ $count -ne 3 ]]; then
+ echo "expected 3 bytes, got $count"
+ res=1
+fi
+
+echo $NSIM_DEV_2_ID > $NSIM_DEV_SYS_DEL
+
+kill $pid
+echo $NSIM_DEV_1_ID > $NSIM_DEV_SYS_DEL
+
+cleanup_ns
+
+modprobe -r netdevsim
+
+exit $res
Connect two netdevsim ports in different namespaces together, then send packets between them using socat. Signed-off-by: David Wei <dw@davidwei.uk> --- .../selftests/drivers/net/netdevsim/peer.sh | 124 ++++++++++++++++++ 1 file changed, 124 insertions(+) create mode 100755 tools/testing/selftests/drivers/net/netdevsim/peer.sh