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

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Date:	Wed, 10 Jun 2015 23:33:31 -0400
From:	Andy Gospodarek <gospo@...ulusnetworks.com>
To:	Scott Feldman <sfeldma@...il.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 11:19:29PM -0400, Andy Gospodarek wrote:
> On Wed, Jun 10, 2015 at 08:07:10PM -0700, Scott Feldman wrote:
> > 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.  
> 
> The API is the same, but I did not see a path that would take a
> multipath route and update the dead nexthops when an interface is taken
> down with switchdev or rocker today.
> 
> I could be wrong (and I will test again), but create a multipath route
> with nexthops on swp1 and swp2 and then call 'ip link set swp1 down' and
> let me know if you see rocker's ECMP routes get updated so only the
> nexthop on swp2 will be used.
> 

Scott, as I stated before I have every intention of adding switchdev as well
as ipv6 support and at this point I hope people know I'm good fot it.
Since I'm already on v3 of the ipv4 support that is looking like a good
idea.  :)  I'm sure you can empathize as you have organically grown the
switchdev support in the kernel.
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