netdev - Re: [PATCH net 2/2] selftests: fib_nexthops: Add test case for ipv4 multi nexthops

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Message-ID: <8bdd9a18-018e-4b87-a2e0-e7d1080b3bf3@linux.dev>
Date: Mon, 15 Dec 2025 20:01:25 +0100
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: Ido Schimmel <idosch@...dia.com>
Cc: "David S. Miller" <davem@...emloft.net>, David Ahern
 <dsahern@...nel.org>, Eric Dumazet <edumazet@...gle.com>,
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
 Willem de Bruijn <willemb@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Shuah Khan <shuah@...nel.org>, netdev@...r.kernel.org
Subject: Re: [PATCH net 2/2] selftests: fib_nexthops: Add test case for ipv4
 multi nexthops

On 15/12/2025 06:59, Ido Schimmel wrote:
> On Sat, Dec 13, 2025 at 01:58:49PM +0000, Vadim Fedorenko wrote:
>> diff --git a/tools/testing/selftests/net/fib_nexthops.sh b/tools/testing/selftests/net/fib_nexthops.sh
>> index 2b0a90581e2f..9d6f57399a73 100755
>> --- a/tools/testing/selftests/net/fib_nexthops.sh
>> +++ b/tools/testing/selftests/net/fib_nexthops.sh
>> @@ -31,6 +31,7 @@ IPV4_TESTS="
>>   	ipv4_compat_mode
>>   	ipv4_fdb_grp_fcnal
>>   	ipv4_mpath_select
>> +	ipv4_mpath_select_nogrp
>>   	ipv4_torture
>>   	ipv4_res_torture
>>   "
>> @@ -375,6 +376,17 @@ check_large_res_grp()
>>   	log_test $? 0 "Dump large (x$buckets) nexthop buckets"
>>   }
>>   
>> +get_route_dev_src()
>> +{
>> +	local pfx="$1"
>> +	local src="$2"
>> +	local out
>> +
>> +	if out=$($IP -j route get "$pfx" from "$src" | jq -re ".[0].dev"); then
>> +		echo "$out"
>> +	fi
>> +}
>> +
>>   get_route_dev()
>>   {
>>   	local pfx="$1"
>> @@ -641,6 +653,79 @@ ipv4_fdb_grp_fcnal()
>>   	$IP link del dev vx10
>>   }
>>   
>> +ipv4_mpath_select_nogrp()
>> +{
>> +	local rc dev match h addr
>> +
>> +	echo
>> +	echo "IPv4 multipath selection no group"
>> +	echo "------------------------"
>> +	if [ ! -x "$(command -v jq)" ]; then
>> +		echo "SKIP: Could not run test; need jq tool"
>> +		return $ksft_skip
>> +	fi
>> +
>> +	IP="ip -netns $peer"
>> +	# Use status of existing neighbor entry when determining nexthop for
>> +	# multipath routes.
>> +	local -A gws
>> +	gws=([veth2]=172.16.1.1 [veth4]=172.16.2.1)
>> +	local -A other_dev
>> +	other_dev=([veth2]=veth4 [veth4]=veth2)
>> +	local -A local_ips
>> +	local_ips=([veth2]=172.16.1.2 [veth4]=172.16.2.2 [veth5]=172.16.100.1)
>> +	local -A route_devs
>> +	route_devs=([veth2]=0 [veth4]=0)
>> +
>> +	run_cmd "$IP address add 172.16.100.1/32 dev lo"
>> +	run_cmd "$IP ro add 172.16.102.0/24 nexthop via ${gws['veth2']} dev veth2 nexthop via ${gws['veth4']} dev veth4"
> 
> fib_nexthops.sh is for tests using nexthop objects: "This test is for
> checking IPv4 and IPv6 FIB behavior with nexthop objects".
> 
> I suggest moving this to fib_tests.sh. See commit 4d0dac499bf3
> ("selftests/net: test tcp connection load balancing") that was added as
> a test for the blamed commit.

Yep, got it. Will move in v2