netdev - Re: [RFC PATCH net-next 13/19] ipv6: Flush all sibling routes upon NETDEV

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Message-ID: <20180103075057.GC761@splinter>
Date:   Wed, 3 Jan 2018 09:50:57 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     David Ahern <dsahern@...il.com>
Cc:     Ido Schimmel <idosch@...lanox.com>, netdev@...r.kernel.org,
        davem@...emloft.net, roopa@...ulusnetworks.com,
        nicolas.dichtel@...nd.com, mlxsw@...lanox.com
Subject: Re: [RFC PATCH net-next 13/19] ipv6: Flush all sibling routes upon
 NETDEV_UNREGISTER

On Tue, Jan 02, 2018 at 10:42:51AM -0700, David Ahern wrote:
> On 12/31/17 9:15 AM, Ido Schimmel wrote:
> > IPv4 and IPv6 react differently to a netdev being unregistered. In IPv4,
> > in case the netdev is used as a nexthop device in a multipath route, the
> > entire route is flushed.
> > 
> > However, IPv6 only removes the nexthops associated with the unregistered
> > netdev.
> > 
> > Align IPv4 and IPv6 and flush all the sibling routes when a nexthop
> > device is unregistered.
> > 
> > Signed-off-by: Ido Schimmel <idosch@...lanox.com>
> > ---
> >  net/ipv6/route.c | 44 +++++++++++++++++++++++++++++++++++++++-----
> >  1 file changed, 39 insertions(+), 5 deletions(-)
> 
> not so sure about this one.

Yea, I wasn't sure about it either. I'll drop it and fix the tests
accordingly.

> When we get to nexthops as separate objects, we can bring in consistency
> by allowing ipv4 routes to just drop a single nexthop in the route
> versus the behavior today.

Agreed.