mlxsw: spectrum_router: Add support for double entry RIFs

[ Upstream commit 5ca1b208c5 ]

In Spectrum-1, loopback router interfaces (RIFs) used for IP-in-IP
encapsulation with an IPv6 underlay require two RIF entries and the RIF
index must be even.

Prepare for this change by extending the RIF parameters structure with a
'double_entry' field that indicates if the RIF being created requires
two RIF entries or not. Only set it for RIFs representing ip6gre tunnels
in Spectrum-1.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Amit Cohen <amcohen@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 12ae97c531fc ("mlxsw: spectrum_ipip: Fix memory leak when changing remote IPv6 address")
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c

@@ -433,6 +433,7 @@ static const struct mlxsw_sp_ipip_ops mlxsw_sp1_ipip_gre6_ops = {
 	.dev_type = ARPHRD_IP6GRE,
 	.ul_proto = MLXSW_SP_L3_PROTO_IPV6,
 	.inc_parsing_depth = true,
+	.double_rif_entry = true,
 	.parms_init = mlxsw_sp1_ipip_netdev_parms_init_gre6,
 	.nexthop_update = mlxsw_sp1_ipip_nexthop_update_gre6,
 	.decap_config = mlxsw_sp1_ipip_decap_config_gre6,

drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.h

@@ -49,6 +49,7 @@ struct mlxsw_sp_ipip_ops {
 	int dev_type;
 	enum mlxsw_sp_l3proto ul_proto; /* Underlay. */
 	bool inc_parsing_depth;
+	bool double_rif_entry;
 
 	struct mlxsw_sp_ipip_parms
 	(*parms_init)(const struct net_device *ol_dev);

drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c

@@ -77,6 +77,7 @@ struct mlxsw_sp_rif_params {
 	};
 	u16 vid;
 	bool lag;
+	bool double_entry;
 };
 
 struct mlxsw_sp_rif_subport {
@@ -1068,6 +1069,7 @@ mlxsw_sp_ipip_ol_ipip_lb_create(struct mlxsw_sp *mlxsw_sp,
 	lb_params = (struct mlxsw_sp_rif_params_ipip_lb) {
 		.common.dev = ol_dev,
 		.common.lag = false,
+		.common.double_entry = ipip_ops->double_rif_entry,
 		.lb_config = ipip_ops->ol_loopback_config(mlxsw_sp, ol_dev),
 	};