netdev - Re: [PATCH net-next 1/3 v3] net: track link-status of ipv4 nexthops

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Date:	Wed, 10 Jun 2015 23:07:28 -0700
From:	Scott Feldman <sfeldma@...il.com>
To:	Andy Gospodarek <gospo@...ulusnetworks.com>
Cc:	Netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>, ddutt@...ulusnetworks.com,
	Alexander Duyck <alexander.duyck@...il.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	"stephen@...workplumber.org" <stephen@...workplumber.org>
Subject: Re: [PATCH net-next 1/3 v3] net: track link-status of ipv4 nexthops

On Wed, Jun 10, 2015 at 7:37 PM, Andy Gospodarek
<gospo@...ulusnetworks.com> wrote:
> Add a fib flag called RTNH_F_LINKDOWN to any ipv4 nexthops that are
> reachable via an interface where carrier is off.  No action is taken,
> but additional flags are passed to userspace to indicate carrier status.

Andy, it seems now RTNH_F_LINKDOWN and RTNH_F_DEAD are very similar
and I'm wondering if this could be done without introducing a new flag
and just use RTNH_F_DEAD.  The link change event would set RTNH_F_DEAD
on nh on dev link down, and clear on link up.  The sysctl knob would
be something like "nexthop_dead_on_linkdown", default off.  So
basically expanding the ways RTNH_F_DEAD can be set.  That would
simplify the patch set quite a bit and require no changes to iproute2.

-scott
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