netdev - Re: [PROBLEM] selftests: net/forwarding/*.sh: 'Command line is not complete. Try option "help"'

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Date: Tue, 18 Jul 2023 10:22:50 +0300
From: Ido Schimmel <idosch@...sch.org>
To: Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
Cc: netdev@...r.kernel.org, linux-kselftest@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Shuah Khan <shuah@...nel.org>, Ido Schimmel <idosch@...dia.com>,
	Nikolay Aleksandrov <razor@...ckwall.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	petrm@...dia.com
Subject: Re: [PROBLEM] selftests: net/forwarding/*.sh: 'Command line is not
 complete. Try option "help"'

On Mon, Jul 17, 2023 at 10:51:04PM +0200, Mirsad Todorovac wrote:
> Tests fail with error message:
> 
> Command line is not complete. Try option "help"
> Failed to create netif
> 
> The script
> 
> # tools/testing/seltests/net/forwarding/bridge_igmp.sh
> 
> bash `set -x` ends with an error:
> 
> ++ create_netif_veth
> ++ local i
> ++ (( i = 1 ))
> ++ (( i <= NUM_NETIFS ))
> ++ local j=2
> ++ ip link show dev
> ++ [[ 255 -ne 0 ]]
> ++ ip link add type veth peer name
> Command line is not complete. Try option "help"
> ++ [[ 255 -ne 0 ]]
> ++ echo 'Failed to create netif'
> Failed to create netif
> ++ exit 1
> 
> The problem seems to be linked with this piece of code of "lib.sh":
> 
> create_netif_veth()
> {
>         local i
> 
>         for ((i = 1; i <= NUM_NETIFS; ++i)); do
>                 local j=$((i+1))
> 
>                 ip link show dev ${NETIFS[p$i]} &> /dev/null
>                 if [[ $? -ne 0 ]]; then
>                         ip link add ${NETIFS[p$i]} type veth \
>                                 peer name ${NETIFS[p$j]}
>                         if [[ $? -ne 0 ]]; then
>                                 echo "Failed to create netif"
>                                 exit 1
>                         fi
>                 fi
>                 i=$j
>         done
> }
> 
> Somehow, ${NETIFS[p$i]} is evaluated to an empty string?

You need to provide a configuration file in
tools/testing/selftests/net/forwarding/forwarding.config. See
tools/testing/selftests/net/forwarding/forwarding.config.sample for
example.

Another option is to provide the interfaces on the command line.

./bridge_igmp.sh veth0 veth1 veth2 veth3

If no configuration file is present, we can try to assume that the
tests are meant to be run with veth pairs and not with physical
loopbacks. Something like:

diff --git a/tools/testing/selftests/net/forwarding/lib.sh b/tools/testing/selftests/net/forwarding/lib.sh
index 71f7c0c49677..5b0183013017 100755
--- a/tools/testing/selftests/net/forwarding/lib.sh
+++ b/tools/testing/selftests/net/forwarding/lib.sh
@@ -16,8 +16,6 @@ TEAMD=${TEAMD:=teamd}
 WAIT_TIME=${WAIT_TIME:=5}
 PAUSE_ON_FAIL=${PAUSE_ON_FAIL:=no}
 PAUSE_ON_CLEANUP=${PAUSE_ON_CLEANUP:=no}
-NETIF_TYPE=${NETIF_TYPE:=veth}
-NETIF_CREATE=${NETIF_CREATE:=yes}
 MCD=${MCD:=smcrouted}
 MC_CLI=${MC_CLI:=smcroutectl}
 PING_COUNT=${PING_COUNT:=10}
@@ -30,6 +28,20 @@ REQUIRE_MZ=${REQUIRE_MZ:=yes}
 REQUIRE_MTOOLS=${REQUIRE_MTOOLS:=no}
 STABLE_MAC_ADDRS=${STABLE_MAC_ADDRS:=no}
 TCPDUMP_EXTRA_FLAGS=${TCPDUMP_EXTRA_FLAGS:=}
+NETIF_TYPE=${NETIF_TYPE:=veth}
+NETIF_CREATE=${NETIF_CREATE:=yes}
+declare -A NETIFS=(
+       [p1]=veth0
+       [p2]=veth1
+       [p3]=veth2
+       [p4]=veth3
+       [p5]=veth4
+       [p6]=veth5
+       [p7]=veth6
+       [p8]=veth7
+       [p9]=veth8
+       [p10]=veth9
+)
 
 relative_path="${BASH_SOURCE%/*}"
 if [[ "$relative_path" == "${BASH_SOURCE}" ]]; then