Re: [PATCH 2/2 net-next] geneve: fix TOS inheriting for ipv6

From: Guillaume Nault
Date: Mon Jul 25 2022 - 13:05:31 EST


On Sun, Jul 24, 2022 at 02:37:41AM +0200, Matthias May wrote:
> The current code uses the RT_TOS macro to cut off the 6 DSCP
> bits, down to the original 3 TOS bits.
>
> Do not use this macro to get the prio for inheriting purposes.

Honestly, this patch is a bug fix and is suitable for the net tree
(with appropriate 'Fixes' tag).

Ideally, we'd also fix ip6_dst_lookup_tunnel() (used by bareudp
tunnels) and vxlan6_get_route().

Also, mlx5e_tc_tun_update_header_ipv6() and
mlx5e_tc_tun_create_header_ipv6() both call RT_TOS() inside
ip6_make_flowinfo() and certainly need to be fixed too.

> Signed-off-by: Matthias May <matthias.may@xxxxxxxxxxxx>
> ---
> drivers/net/geneve.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
> index 4c380c06f178..e1a4480e6f17 100644
> --- a/drivers/net/geneve.c
> +++ b/drivers/net/geneve.c
> @@ -877,8 +877,7 @@ static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
> use_cache = false;
> }
>
> - fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
> - info->key.label);
> + fl6->flowlabel = ip6_make_flowinfo(prio, info->key.label);
> dst_cache = (struct dst_cache *)&info->dst_cache;
> if (use_cache) {
> dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
> --
> 2.35.1
>