linux-kernel - Re: [PATCH] selftests: add a generic testsuite for ethernet device

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Message-ID: <20170331141241.GH22609@lunn.ch>
Date:   Fri, 31 Mar 2017 16:12:41 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Corentin Labbe <clabbe.montjoie@...il.com>
Cc:     davem@...emloft.net, shuah@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH] selftests: add a generic testsuite for ethernet device

On Fri, Mar 31, 2017 at 02:57:52PM +0200, Corentin Labbe wrote:
> This patch add a generic testsuite for testing ethernet network device driver.
> 
> Signed-off-by: Corentin Labbe <clabbe.montjoie@...il.com>
> ---
>  tools/testing/selftests/net/Makefile     |   2 +-
>  tools/testing/selftests/net/netdevice.sh | 185 +++++++++++++++++++++++++++++++
>  2 files changed, 186 insertions(+), 1 deletion(-)
>  create mode 100755 tools/testing/selftests/net/netdevice.sh
> 
> diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
> index fbfe5d0..35cbb4c 100644
> --- a/tools/testing/selftests/net/Makefile
> +++ b/tools/testing/selftests/net/Makefile
> @@ -5,7 +5,7 @@ CFLAGS += -I../../../../usr/include/
>  
>  reuseport_bpf_numa: LDFLAGS += -lnuma
>  
> -TEST_PROGS := run_netsocktests run_afpackettests test_bpf.sh
> +TEST_PROGS := run_netsocktests run_afpackettests test_bpf.sh netdevice.sh
>  TEST_GEN_FILES =  socket
>  TEST_GEN_FILES += psock_fanout psock_tpacket
>  TEST_GEN_FILES += reuseport_bpf reuseport_bpf_cpu reuseport_bpf_numa
> diff --git a/tools/testing/selftests/net/netdevice.sh b/tools/testing/selftests/net/netdevice.sh
> new file mode 100755
> index 0000000..89ba827
> --- /dev/null
> +++ b/tools/testing/selftests/net/netdevice.sh
> @@ -0,0 +1,185 @@
> +#!/bin/sh
> +#
> +# This test is for checking network interface
> +# For the moment it tests only ethernet interface (but wifi could be easily added)
> +#
> +# We assume that all network driver are loaded
> +# if not they probably have failed earlier in the boot process and their logged error will be catched by another test
> +#
> +

Hi Corentin

Nice to see some basic tests.

> +# this function will try to up the interface
> +# if already up, nothing done
> +# arg1: network interface name
> +kci_net_start()
> +{
> +	netdev=$1
> +
> +	ip link show "$netdev" |grep -q UP
> +	if [ $? -eq 0 ];then
> +		echo "SKIP: interface $netdev already up"
> +		return 0
> +	fi
> +
> +	ip link set "$netdev" up
> +	if [ $? -ne 0 ];then
> +		echo "FAIL: Fail to up $netdev"
> +		return 1
> +	else
> +		echo "PASS: set interface $netdev up"
> +		NETDEV_STARTED=1
> +	fi

This is going to be problematic.

3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000
    link/ether 8e:01:30:d5:63:ff brd ff:ff:ff:ff:ff:ff
4: lan1@...1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ether 8e:01:30:d5:63:ff brd ff:ff:ff:ff:ff:ff

lan1 has eth1 as its master interface. If you try to up lan1 while eth1 is down:

# ip link set lan1 up
RTNETLINK answers: Network is down

> +
> +ls /sys/class/net/ |grep -vE '^lo|^tun' | grep -E '^eth|enp[0-9]s[0-9]' > "$TMP_LIST_NETDEV"
> +while read netdev
> +do
> +	kci_test_netdev "$netdev"
> +done < "$TMP_LIST_NETDEV"

Because of the grep, on this board, you won't actually test
lan1. Which is a shame. It would be nice to test it, and the other
interfaces like it.

Rather than going on the order ls gives you, could you order it based
on the ifnum? The master has to exist before a slave can be
created. Hence the master has a lower ifnum than the slave. So bring
the interfaces up in ifnum order, and down in reverse order.

Thanks
	Andrew