netdev - Re: [PATCH net-next 0/3 v3] changes to make ipv4 routing table aware of next-hop link status

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Message-ID: <CAE4R7bChX1AtwoeC12ei1hr-3CJnZwPig8YXKpvAuhHSRyVYLg@mail.gmail.com>
Date:	Wed, 10 Jun 2015 20:07:10 -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 0/3 v3] changes to make ipv4 routing table aware
 of next-hop link status

On Wed, Jun 10, 2015 at 7:37 PM, Andy Gospodarek
<gospo@...ulusnetworks.com> wrote:

> There was also a request for switchdev support for this, but that will be
> posted as a followup as switchdev does not currently handle dead
> next-hops in a multi-path case and I felt that infra needed to be added
> first.

That's not true.  switchdev_fib_ipv4_add() passes *fi and all of the
nexthops for the route are hanging off of that, including the
nh->flags where you're setting LINKDOWN.  Multipath is not different
than singlepath in that regard.  Same API for both.  switchdev support
should be added for this NEW feature, especially since you're using
the feature to offload to a switch device.
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