mlxsw: spectrum_nve: Breakout common code to a common function

The configuration of a VXLAN tunnel in Spectrum-1 and Spectrum-2 is
largely the same. To avoid code duplication, breakout the common parts
to a common function that can be invoked from the ASIC-specific code.
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -112,13 +112,30 @@ static int mlxsw_sp_nve_parsing_set(struct mlxsw_sp *mlxsw_sp,
 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(mprs), mprs_pl);
 }
 
+static void
+mlxsw_sp_nve_vxlan_config_prepare(char *tngcr_pl,
+				  const struct mlxsw_sp_nve_config *config)
+{
+	u8 udp_sport;
+
+	mlxsw_reg_tngcr_pack(tngcr_pl, MLXSW_REG_TNGCR_TYPE_VXLAN, true,
+			     config->ttl);
+	/* VxLAN driver's default UDP source port range is 32768 (0x8000)
+	 * to 60999 (0xee47). Set the upper 8 bits of the UDP source port
+	 * to a random number between 0x80 and 0xee
+	 */
+	get_random_bytes(&udp_sport, sizeof(udp_sport));
+	udp_sport = (udp_sport % (0xee - 0x80 + 1)) + 0x80;
+	mlxsw_reg_tngcr_nve_udp_sport_prefix_set(tngcr_pl, udp_sport);
+	mlxsw_reg_tngcr_usipv4_set(tngcr_pl, be32_to_cpu(config->ul_sip.addr4));
+}
+
 static int
 mlxsw_sp1_nve_vxlan_config_set(struct mlxsw_sp *mlxsw_sp,
 			       const struct mlxsw_sp_nve_config *config)
 {
 	char tngcr_pl[MLXSW_REG_TNGCR_LEN];
 	u16 ul_vr_id;
-	u8 udp_sport;
 	int err;
 
 	err = mlxsw_sp_router_tb_id_vr_id(mlxsw_sp, config->ul_tb_id,
@@ -126,18 +143,9 @@ mlxsw_sp1_nve_vxlan_config_set(struct mlxsw_sp *mlxsw_sp,
 	if (err)
 		return err;
 
-	mlxsw_reg_tngcr_pack(tngcr_pl, MLXSW_REG_TNGCR_TYPE_VXLAN, true,
-			     config->ttl);
-	/* VxLAN driver's default UDP source port range is 32768 (0x8000)
-	 * to 60999 (0xee47). Set the upper 8 bits of the UDP source port
-	 * to a random number between 0x80 and 0xee
-	 */
-	get_random_bytes(&udp_sport, sizeof(udp_sport));
-	udp_sport = (udp_sport % (0xee - 0x80 + 1)) + 0x80;
-	mlxsw_reg_tngcr_nve_udp_sport_prefix_set(tngcr_pl, udp_sport);
+	mlxsw_sp_nve_vxlan_config_prepare(tngcr_pl, config);
 	mlxsw_reg_tngcr_learn_enable_set(tngcr_pl, config->learning_en);
 	mlxsw_reg_tngcr_underlay_virtual_router_set(tngcr_pl, ul_vr_id);
-	mlxsw_reg_tngcr_usipv4_set(tngcr_pl, be32_to_cpu(config->ul_sip.addr4));
 
 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(tngcr), tngcr_pl);
 }