mlxsw: spectrum_acl: Enable C-TCAM only mode in eRP core

Currently, no calls are performed into the eRP core, but in order to
make review easier we would like to gradually add these calls.

Have the eRP core initialize a region's master mask to all ones and
allow it to use an empty eRP table. This directs the lookup to the
C-TCAM and allows the C-TCAM only mode to continue working.
Signed-off-by: NIdo Schimmel <idosch@mellanox.com>
Reviewed-by: NJiri Pirko <jiri@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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

@@ -879,7 +879,7 @@ mlxsw_sp_acl_erp_region_param_init(struct mlxsw_sp_acl_atcam_region *aregion)
 	struct mlxsw_sp *mlxsw_sp = aregion->region->mlxsw_sp;
 	char pererp_pl[MLXSW_REG_PERERP_LEN];
 
-	mlxsw_reg_pererp_pack(pererp_pl, aregion->region->id, false, false, 0,
+	mlxsw_reg_pererp_pack(pererp_pl, aregion->region->id, true, true, 0,
 			      0, 0);
 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(pererp), pererp_pl);
 }
@@ -894,12 +894,16 @@ int mlxsw_sp_acl_erp_region_init(struct mlxsw_sp_acl_atcam_region *aregion)
 		return PTR_ERR(erp_table);
 	aregion->erp_table = erp_table;
 
-	/* Initialize the region's master mask to all zeroes */
+	/* Initialize the region's master mask to all ones for C-TCAM
+	 * only mode
+	 */
 	err = mlxsw_sp_acl_erp_master_mask_init(aregion);
 	if (err)
 		goto err_erp_master_mask_init;
 
-	/* Initialize the region to not use the eRP table */
+	/* Initialize the region to use the eRP table and enable C-TCAM
+	 * lookup
+	 */
 	err = mlxsw_sp_acl_erp_region_param_init(aregion);
 	if (err)
 		goto err_erp_region_param_init;