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Date: Thu, 29 Feb 2024 18:26:51 +0100
From: Maciek Machnikowski <maciek@...hnikowski.net>
To: David Wei <dw@...idwei.uk>, Jakub Kicinski <kuba@...nel.org>,
Jiri Pirko <jiri@...nulli.us>, Sabrina Dubroca <sd@...asysnail.net>,
horms@...nel.org, netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH v14 4/5] netdevsim: add selftest for forwarding skb
between connected ports
On 29/02/2024 00:22, David Wei wrote:
> Connect two netdevsim ports in different namespaces together, then send
> packets between them using socat.
>
> Signed-off-by: David Wei <dw@...idwei.uk>
> ---
> .../selftests/drivers/net/netdevsim/Makefile | 1 +
> .../selftests/drivers/net/netdevsim/peer.sh | 143 ++++++++++++++++++
> 2 files changed, 144 insertions(+)
> create mode 100755 tools/testing/selftests/drivers/net/netdevsim/peer.sh
>
> diff --git a/tools/testing/selftests/drivers/net/netdevsim/Makefile b/tools/testing/selftests/drivers/net/netdevsim/Makefile
> index 7a29a05bea8b..5bace0b7fb57 100644
> --- a/tools/testing/selftests/drivers/net/netdevsim/Makefile
> +++ b/tools/testing/selftests/drivers/net/netdevsim/Makefile
> @@ -10,6 +10,7 @@ TEST_PROGS = devlink.sh \
> fib.sh \
> hw_stats_l3.sh \
> nexthop.sh \
> + peer.sh \
> psample.sh \
> tc-mq-visibility.sh \
> udp_tunnel_nic.sh \
> diff --git a/tools/testing/selftests/drivers/net/netdevsim/peer.sh b/tools/testing/selftests/drivers/net/netdevsim/peer.sh
> new file mode 100755
> index 000000000000..aed62d9e6c0a
> --- /dev/null
> +++ b/tools/testing/selftests/drivers/net/netdevsim/peer.sh
> @@ -0,0 +1,143 @@
> +#!/bin/bash
> +# SPDX-License-Identifier: GPL-2.0-only
> +
> +source ../../../net/net_helper.sh
> +
> +NSIM_DEV_1_ID=$((256 + RANDOM % 256))
> +NSIM_DEV_1_SYS=/sys/bus/netdevsim/devices/netdevsim$NSIM_DEV_1_ID
> +NSIM_DEV_2_ID=$((512 + RANDOM % 256))
> +NSIM_DEV_2_SYS=/sys/bus/netdevsim/devices/netdevsim$NSIM_DEV_2_ID
> +
> +NSIM_DEV_SYS_NEW=/sys/bus/netdevsim/new_device
> +NSIM_DEV_SYS_DEL=/sys/bus/netdevsim/del_device
> +NSIM_DEV_SYS_LINK=/sys/bus/netdevsim/link_device
> +NSIM_DEV_SYS_UNLINK=/sys/bus/netdevsim/unlink_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
> +###
> +
> +socat_check || exit 4
> +
> +modprobe netdevsim
> +
> +# linking
> +
> +echo $NSIM_DEV_1_ID > $NSIM_DEV_SYS_NEW
> +echo $NSIM_DEV_2_ID > $NSIM_DEV_SYS_NEW
> +udevadm settle
> +
> +setup_ns
> +
> +NSIM_DEV_1_FD=$((256 + RANDOM % 256))
> +exec {NSIM_DEV_1_FD}</var/run/netns/nssv
> +NSIM_DEV_1_IFIDX=$(ip netns exec nssv cat /sys/class/net/$NSIM_DEV_1_NAME/ifindex)
> +
> +NSIM_DEV_2_FD=$((256 + RANDOM % 256))
> +exec {NSIM_DEV_2_FD}</var/run/netns/nscl
> +NSIM_DEV_2_IFIDX=$(ip netns exec nscl cat /sys/class/net/$NSIM_DEV_2_NAME/ifindex)
> +
> +echo "$NSIM_DEV_1_FD:$NSIM_DEV_1_IFIDX $NSIM_DEV_2_FD:2000" > $NSIM_DEV_SYS_LINK 2>/dev/null
> +if [ $? -eq 0 ]; then
> + echo "linking with non-existent netdevsim should fail"
> + cleanup_ns
> + exit 1
> +fi
> +
> +echo "$NSIM_DEV_1_FD:$NSIM_DEV_1_IFIDX 2000:$NSIM_DEV_2_IFIDX" > $NSIM_DEV_SYS_LINK 2>/dev/null
> +if [ $? -eq 0 ]; then
> + echo "linking with non-existent netnsid should fail"
> + cleanup_ns
> + exit 1
> +fi
> +
> +echo "$NSIM_DEV_1_FD:$NSIM_DEV_1_IFIDX $NSIM_DEV_1_FD:$NSIM_DEV_1_IFIDX" > $NSIM_DEV_SYS_LINK 2>/dev/null
> +if [ $? -eq 0 ]; then
> + echo "linking with self should fail"
> + cleanup_ns
> + exit 1
> +fi
> +
> +echo "$NSIM_DEV_1_FD:$NSIM_DEV_1_IFIDX $NSIM_DEV_2_FD:$NSIM_DEV_2_IFIDX" > $NSIM_DEV_SYS_LINK
> +if [ $? -ne 0 ]; then
> + echo "linking netdevsim1 with netdevsim2 should succeed"
> + cleanup_ns
> + exit 1
> +fi
> +
> +# argument error checking
> +
> +echo "$NSIM_DEV_1_FD:$NSIM_DEV_1_IFIDX $NSIM_DEV_2_FD:a" > $NSIM_DEV_SYS_LINK 2>/dev/null
> +if [ $? -eq 0 ]; then
> + echo "invalid arg should fail"
> + cleanup_ns
> + exit 1
> +fi
> +
> +# send/recv packets
> +
> +tmp_file=$(mktemp)
> +ip netns exec nssv socat TCP-LISTEN:1234,fork $tmp_file &
> +pid=$!
> +res=0
> +
> +wait_local_port_listen nssv 1234 tcp
> +
> +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_1_FD:$NSIM_DEV_1_IFIDX" > $NSIM_DEV_SYS_UNLINK
> +
> +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
Reviewed-by: Maciek Machnikowski <maciek@...hnikowski.net>
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