netdev - Re: [PATCH net-next 15/18] ipv6: Flush multipath routes when all siblings are dead

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Date:   Sun, 7 Jan 2018 10:08:22 -0700
From:   David Ahern <dsahern@...il.com>
To:     Ido Schimmel <idosch@...lanox.com>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, roopa@...ulusnetworks.com,
        nicolas.dichtel@...nd.com, weiwan@...gle.com, kafai@...com,
        yoshfuji@...ux-ipv6.org, mlxsw@...lanox.com
Subject: Re: [PATCH net-next 15/18] ipv6: Flush multipath routes when all
 siblings are dead

On 1/7/18 3:45 AM, Ido Schimmel wrote:
> By default, IPv6 deletes nexthops from a multipath route when the
> nexthop device is put administratively down. This differs from IPv4
> where the nexthops are kept, but marked with the RTNH_F_DEAD flag. A
> multipath route is flushed when all of its nexthops become dead.
> 
> Align IPv6 with IPv4 and have it conform to the same guidelines.
> 
> In case the multipath route needs to be flushed, its siblings are
> flushed one by one. Otherwise, the nexthops are marked with the
> appropriate flags and the tree walker is instructed to skip all the
> siblings.
> 
> As explained in previous patches, care is taken to update the sernum of
> the affected tree nodes, so as to prevent the use of wrong dst entries.
> 
> Signed-off-by: Ido Schimmel <idosch@...lanox.com>
> ---
>  net/ipv6/route.c | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++------
>  1 file changed, 75 insertions(+), 8 deletions(-)

Acked-by: David Ahern <dsahern@...il.com>