Re: [PATCH net] mlxsw: spectrum_router: Fix IPv4 nexthop gateway indication

[David Ahern <dsahern@gmail.com>]

On 7/19/22 6:26 AM, Ido Schimmel wrote:
> mlxsw needs to distinguish nexthops with a gateway from connected
> nexthops in order to write the former to the adjacency table of the
> device. The check used to rely on the fact that nexthops with a gateway
> have a 'link' scope whereas connected nexthops have a 'host' scope. This
> is no longer correct after commit 747c14307214 ("ip: fix dflt addr
> selection for connected nexthop").
> 
> Fix that by instead checking the address family of the gateway IP. This
> is a more direct way and also consistent with the IPv6 counterpart in
> mlxsw_sp_rt6_is_gateway().
> 
> Cc: stable@vger.kernel.org
> Fixes: 747c14307214 ("ip: fix dflt addr selection for connected nexthop")
> Fixes: 597cfe4fc339 ("nexthop: Add support for IPv4 nexthops")
> Signed-off-by: Ido Schimmel <idosch@nvidia.com>
> Reviewed-by: Amit Cohen <amcohen@nvidia.com>
> ---
> Copied stable since Nicolas' patch has stable copied and I don't want
> stable trees to have his patch, but not mine. To make it clear how far
> this patch needs to be backported, I have included the same Fixes tag as
> him.
> ---
>  drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 

Reviewed-by: David Ahern <dsahern@kernel.org>