netdev - Re: [PATCH net v3 2/3] ipv6: ignore dst hint for multipath routes

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Message-ID: <ZOy6QfalXBa6AvOT@shredder>
Date: Mon, 28 Aug 2023 18:16:17 +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>, Petr Machata <petrm@...dia.com>
Subject: Re: [PATCH net v3 2/3] ipv6: ignore dst hint for multipath routes

On Mon, Aug 28, 2023 at 01:32:20PM +0200, Sriram Yagnaraman wrote:
> Route hints when the nexthop is part of a multipath group causes packets
> in the same receive batch to be sent to the same nexthop irrespective of
> the multipath hash of the packet. So, do not extract route hint for
> packets whose destination is part of a multipath group.
> 
> A new SKB flag IP6SKB_MULTIPATH is introduced for this purpose, set the
> flag when route is looked up in fib6_select_path() and use it in
> ip6_can_use_hint() to check for the existence of the flag.
> 
> Fixes: 197dbf24e360 ("ipv6: introduce and uses route look hints for list input.")
> Signed-off-by: Sriram Yagnaraman <sriram.yagnaraman@....tech>

Reviewed-by: Ido Schimmel <idosch@...dia.com>