netdev - Re: [patch net-next 12/15] ipv4: fib: Notify about nexthop status changes

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Message-ID: <20170208182038.GA14683@splinter.mtl.com>
Date:   Wed, 8 Feb 2017 20:20:38 +0200
From:   Ido Schimmel <idosch@...lanox.com>
To:     David Ahern <dsa@...ulusnetworks.com>
CC:     Andy Gospodarek <andy@...yhouse.net>,
        Jiri Pirko <jiri@...nulli.us>, <netdev@...r.kernel.org>,
        <davem@...emloft.net>, <eladr@...lanox.com>, <mlxsw@...lanox.com>,
        Roopa Prabhu <roopa@...ulusnetworks.com>
Subject: Re: [patch net-next 12/15] ipv4: fib: Notify about nexthop status
 changes

On Wed, Feb 08, 2017 at 11:05:54AM -0700, David Ahern wrote:
> On 2/8/17 8:32 AM, Ido Schimmel wrote:
> > In the case of multipath routes, if some of the nexthops can be
> > reflected, then we do so, but periodically ask the kernel to try and
> > resolve the others. Otherwise, these nexthops will never be resolved, as
> > the kernel doesn't see the packets hitting the multipath route and
> > therefore lacks the motivation to resolve its nexthops.
> 
> It should get the motivation once the neigh entry is cleaned up. That
> can take a long time based on gc settings, but it can also happen from
> the remote side if it sends an arp message.

And when the remote side does that and the neighbour becomes valid we no
longer try to actively resolve it.