netdev - [net-next 15/16] net/mlx5e: Add IPv6 traffic class (DSCP) header rewrite support

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Date:   Tue, 15 Sep 2020 13:25:32 -0700
From:   saeed@...nel.org
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, Maor Dickman <maord@...dia.com>,
        Roi Dayan <roid@...dia.com>, Saeed Mahameed <saeedm@...dia.com>
Subject: [net-next 15/16] net/mlx5e: Add IPv6 traffic class (DSCP) header rewrite support

From: Maor Dickman <maord@...dia.com>

Add support for rewriting of IPV6 DSCP part of traffic class field.
Next commands, for example, can be used to offload rewrite action:

OVS:
 $ ovs-ofctl add-flow ovs-sriov "tcpv6, in_port=REP, \
       actions=mod_nw_tos:68, output:NIC"

iproute2:
 $ tc filter add dev REP ingress protocol ipv6 prio 1 flower skip_sw \
       ip_proto tcp \
       action pedit ex munge ip6 traffic_class set 68 retain 0xfc pipe \
       action mirred egress redirect dev NIC

Signed-off-by: Maor Dickman <maord@...dia.com>
Reviewed-by: Roi Dayan <roid@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 2dded22a64a3..817c503693fc 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -2615,6 +2615,7 @@ static struct mlx5_fields fields[] = {
 	OFFLOAD(DIPV6_31_0,   32, U32_MAX, ip6.daddr.s6_addr32[3], 0,
 		dst_ipv4_dst_ipv6.ipv6_layout.ipv6[12]),
 	OFFLOAD(IPV6_HOPLIMIT, 8,  U8_MAX, ip6.hop_limit, 0, ttl_hoplimit),
+	OFFLOAD(IP_DSCP, 16,  0xc00f, ip6, 0, ip_dscp),
 
 	OFFLOAD(TCP_SPORT, 16, U16_MAX, tcp.source,  0, tcp_sport),
 	OFFLOAD(TCP_DPORT, 16, U16_MAX, tcp.dest,    0, tcp_dport),
-- 
2.26.2