netdev - Re: [patch net-next] ipv6: fib: Provide offload indication using nexthop flags

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Date:   Tue, 15 Aug 2017 08:18:36 -0600
From:   David Ahern <dsahern@...il.com>
To:     Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, idosch@...lanox.com, mlxsw@...lanox.com,
        roopa@...ulusnetworks.com, nikolay@...ulusnetworks.com,
        hannes@...essinduktion.org, yoshfuji@...ux-ipv6.org,
        kuznet@....inr.ac.ru
Subject: Re: [patch net-next] ipv6: fib: Provide offload indication using
 nexthop flags

On 8/15/17 1:09 AM, Jiri Pirko wrote:
> From: Ido Schimmel <idosch@...lanox.com>
> 
> IPv6 routes currently lack nexthop flags as in IPv4. This has several
> implications.
> 
> In the forwarding path, it requires us to check the carrier state of the
> nexthop device and potentially ignore a linkdown route, instead of
> checking for RTNH_F_LINKDOWN.
> 
> It also requires capable drivers to use the user facing IPv6-specific
> route flags to provide offload indication, instead of using the nexthop
> flags as in IPv4.
> 
> Add nexthop flags to IPv6 routes in the 40 bytes hole and use it to
> provide offload indication instead of the RTF_OFFLOAD flag, which is
> removed while it's still not part of any official kernel release.
> 
> In the near future we would like to use the field for the
> RTNH_F_{LINKDOWN,DEAD} flags, but this change is more involved and might
> not be ready in time for the current cycle.
> 
> Signed-off-by: Ido Schimmel <idosch@...lanox.com>
> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
> ---
>  drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 8 ++++----
>  include/net/ip6_fib.h                                 | 2 ++
>  include/uapi/linux/ipv6_route.h                       | 1 -
>  net/ipv6/route.c                                      | 7 +------
>  4 files changed, 7 insertions(+), 11 deletions(-)

LGTM.

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