mlxsw: reg: Add support for ratr_ipip6_entry_pack()

The RATR register is used to configure the Router Adjacency (next-hop)
Table.

For IP-in-IP entry, underlay destination IPv4 is saved as part of this
register and underlay destination IPv6 is saved by RIPS register and RATR
saves pointer to it.

Add function for setting IPv6 IP-in-IP configuration.
Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -7002,6 +7002,12 @@ static inline void mlxsw_reg_ratr_ipip4_entry_pack(char *payload, u32 ipv4_udip)
 	mlxsw_reg_ratr_ipip_ipv4_udip_set(payload, ipv4_udip);
 }
 
+static inline void mlxsw_reg_ratr_ipip6_entry_pack(char *payload, u32 ipv6_ptr)
+{
+	mlxsw_reg_ratr_ipip_type_set(payload, MLXSW_REG_RATR_IPIP_TYPE_IPV6);
+	mlxsw_reg_ratr_ipip_ipv6_ptr_set(payload, ipv6_ptr);
+}
+
 static inline void mlxsw_reg_ratr_counter_pack(char *payload, u64 counter_index,
 					       bool counter_enable)
 {