From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Ahern <dsahern@gmail.com>
Subject: Re: [PATCH net-next 00/18] ipv6: Align nexthop behaviour with IPv4
Date: Tue, 9 Jan 2018 21:41:11 -0700
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Cc: Ido Schimmel <idosch@mellanox.com>, netdev@vger.kernel.org,
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To: Ido Schimmel <idosch@idosch.org>
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On 1/9/18 1:04 AM, Ido Schimmel wrote:
> On Sun, Jan 07, 2018 at 10:20:11AM -0700, David Ahern wrote:
>> One of many follow on changes that would be beneficial is to remove the
>> idev dereference in the hot path to check the
>> ignore_routes_with_linkdown sysctl.
> 
> When a netdev loses its carrier we can set the RTNH_F_DEAD flag for all
> the nexthops using it as their nexthop device, in case the sysctl is
> set. Similarly, when the sysctl is toggled we can walk the routing
> tables and toggle the flag where appropriate.
> 
> You have a different idea?

that would work.