mlxsw: reg: Add 'flood_rsp' field to SFMR register

SFMR register creates and configures FIDs. As preparation for unified
bridge model, add a field for future use.

In the new model, RITR no longer configures the rFID used for sub-port RIFs
and it has to be created by software via SFMR. Such FIDs need to be created
with special flood indication using 'flood_rsp' field. When set, this bit
instructs the device to manage the flooding entries for this FID in a
reserved part of the port group table (PGT).
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

@@ -1764,6 +1764,18 @@ MLXSW_ITEM32(reg, sfmr, op, 0x00, 24, 4);
  */
 MLXSW_ITEM32(reg, sfmr, fid, 0x00, 0, 16);
 
+/* reg_sfmr_flood_rsp
+ * Router sub-port flooding table.
+ * 0 - Regular flooding table.
+ * 1 - Router sub-port flooding table. For this FID the flooding is per
+ * router-sub-port local_port. Must not be set for a FID which is not a
+ * router-sub-port and must be set prior to enabling the relevant RIF.
+ * Access: RW
+ *
+ * Note: Reserved when legacy bridge model is used.
+ */
+MLXSW_ITEM32(reg, sfmr, flood_rsp, 0x08, 31, 1);
+
 /* reg_sfmr_fid_offset
  * FID offset.
  * Used to point into the flooding table selected by SFGC register if