netdev - Re: [patch net-next 10/17] ipv6: fib: Add offload indication to routes

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Message-ID: <20170719154920.GA6078@splinter>
Date:   Wed, 19 Jul 2017 18:49:20 +0300
From:   Ido Schimmel <idosch@...lanox.com>
To:     David Ahern <dsahern@...il.com>
Cc:     Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org,
        davem@...emloft.net, mlxsw@...lanox.com, roopa@...ulusnetworks.com,
        nikolay@...ulusnetworks.com, kafai@...com,
        hannes@...essinduktion.org, yoshfuji@...ux-ipv6.org,
        edumazet@...gle.com, yanhaishuang@...s.chinamobile.com
Subject: Re: [patch net-next 10/17] ipv6: fib: Add offload indication to
 routes

On Wed, Jul 19, 2017 at 09:27:30AM -0600, David Ahern wrote:
> On 7/19/17 1:02 AM, Jiri Pirko wrote:
> > Allow user space applications to see which routes are offloaded and
> > which aren't by setting the RTNH_F_OFFLOAD flag when dumping them.
> > 
> > To be consistent with IPv4, a multipath route is marked as offloaded if
> > one of its nexthops is offloaded. Individual nexthops aren't marked with
> > the 'offload' flag.
> 
> It is more user friendly to report the offload per nexthop especially
> given the implications. There are already flags per nexthop and those
> flags are pushed to userspace so not an API change at all.

I thought about it, but then just decided to be consistent with IPv4.

I can send a follow-up patchset that aligns both families to the
behavior you requested. Need to teach iproute2 to look for
RTNH_F_OFFLOAD in rtnh_flags as well.