netdev - Re: [PATCH 3/3] selftests: forwarding: Add test for load-balancing between multiple servers

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Date: Mon, 21 Aug 2023 14:34:39 +0300
From: Ido Schimmel <idosch@...sch.org>
To: Sriram Yagnaraman <sriram.yagnaraman@....tech>
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>,
	David Ahern <dsahern@...nel.org>, Ido Schimmel <idosch@...dia.com>,
	Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH 3/3] selftests: forwarding: Add test for load-balancing
 between multiple servers

On Sat, Aug 19, 2023 at 01:48:25PM +0200, Sriram Yagnaraman wrote:
> Create a topology with 3 hosts, a router each in it's own network
> namespace. Test IPv4 and IPv6 multipath routing from h1 to h2/h3 via
> router r1 where a multipath route is setup to load-balance between h2
> and h3.
> 
> See diagram in the test for more information.

How are you running this test? At least with veth pairs it is passing
both before and after the patches. I didn't look into the veth driver,
it might not even use the listified path.

Also, I'm seeing the following errors during the test:

sysctl: setting key "net.ipv4.fib_multipath_hash_policy": Invalid argument
sysctl: setting key "net.ipv6.fib_multipath_hash_policy": Invalid argument