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

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Message-ID: <c66afab7-732c-c68e-cc53-7425d92df42b@gmail.com>
Date:   Tue, 19 Jul 2022 12:03:42 -0600
From:   David Ahern <dsahern@...il.com>
To:     Ido Schimmel <idosch@...dia.com>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com, petrm@...dia.com, amcohen@...dia.com,
        nicolas.dichtel@...nd.com, mlxsw@...dia.com, stable@...r.kernel.org
Subject: Re: [PATCH net] mlxsw: spectrum_router: Fix IPv4 nexthop gateway
 indication

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@...r.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@...dia.com>
> Reviewed-by: Amit Cohen <amcohen@...dia.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@...nel.org>