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mlx5: do not use RT_TOS for IPv6 flowlabel

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According to Guillaume Nault RT_TOS should never be used for IPv6.

Quote:
RT_TOS() is an old macro used to interprete IPv4 TOS as described in
the obsolete RFC 1349. It's conceptually wrong to use it even in IPv4
code, although, given the current state of the code, most of the
existing calls have no consequence.

But using RT_TOS() in IPv6 code is always a bug: IPv6 never had a "TOS"
field to be interpreted the RFC 1349 way. There's no historical
compatibility to worry about.

Fixes: ce99f6b97f ("net/mlx5e: Support SRIOV TC encapsulation offloads for IPv6 tunnels")
Acked-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: Matthias May <matthias.may@westermo.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Matthias May 2022-08-05 21:19:05 +02:00 • committed by Jakub Kicinski
parent e488d4f5d6
commit bcb0da7fff
1 changed files with 2 additions and 2 deletions
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4
drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c
View file

@ -506,7 +506,7 @@ int mlx5e_tc_tun_create_header_ipv6(struct mlx5e_priv *priv,
int err;
attr.ttl = tun_key->ttl;
attr.fl.fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tun_key->tos), tun_key->label);
attr.fl.fl6.flowlabel = ip6_make_flowinfo(tun_key->tos, tun_key->label);
attr.fl.fl6.daddr = tun_key->u.ipv6.dst;
attr.fl.fl6.saddr = tun_key->u.ipv6.src;
@ -620,7 +620,7 @@ int mlx5e_tc_tun_update_header_ipv6(struct mlx5e_priv *priv,
attr.ttl = tun_key->ttl;
attr.fl.fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tun_key->tos), tun_key->label);
attr.fl.fl6.flowlabel = ip6_make_flowinfo(tun_key->tos, tun_key->label);
attr.fl.fl6.daddr = tun_key->u.ipv6.dst;
attr.fl.fl6.saddr = tun_key->u.ipv6.src;