net: dsa: mv88e6xxx: variable number of databases

Marvell switch chips have different number of address databases.

The code currently only supports models with 4096 databases. Such switch
has dedicated FID registers for ATU and VTU operations. Models with
fewer databases have their FID split in several registers.

List them all but only support models with 4096 databases at the moment.
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx.c

@@ -482,6 +482,30 @@ static bool mv88e6xxx_6352_family(struct dsa_switch *ds)
 	return false;
 }
 
+static unsigned int mv88e6xxx_num_databases(struct dsa_switch *ds)
+{
+	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
+
+	/* The following devices have 4-bit identifiers for 16 databases */
+	if (ps->id == PORT_SWITCH_ID_6061)
+		return 16;
+
+	/* The following devices have 6-bit identifiers for 64 databases */
+	if (ps->id == PORT_SWITCH_ID_6065)
+		return 64;
+
+	/* The following devices have 8-bit identifiers for 256 databases */
+	if (mv88e6xxx_6095_family(ds) || mv88e6xxx_6185_family(ds))
+		return 256;
+
+	/* The following devices have 12-bit identifiers for 4096 databases */
+	if (mv88e6xxx_6097_family(ds) || mv88e6xxx_6165_family(ds) ||
+	    mv88e6xxx_6351_family(ds) || mv88e6xxx_6352_family(ds))
+		return 4096;
+
+	return 0;
+}
+
 static bool mv88e6xxx_has_fid_reg(struct dsa_switch *ds)
 {
 	/* Does the device have dedicated FID registers for ATU and VTU ops? */
@@ -1534,9 +1558,15 @@ static int _mv88e6xxx_stu_loadpurge(struct dsa_switch *ds,
 static int _mv88e6xxx_port_fid(struct dsa_switch *ds, int port, u16 *new,
 			       u16 *old)
 {
+	u16 upper_mask;
 	u16 fid;
 	int ret;
 
+	if (mv88e6xxx_num_databases(ds) == 4096)
+		upper_mask = 0xff;
+	else
+		return -EOPNOTSUPP;
+
 	/* Port's default FID bits 3:0 are located in reg 0x06, offset 12 */
 	ret = _mv88e6xxx_reg_read(ds, REG_PORT(port), PORT_BASE_VLAN);
 	if (ret < 0)
@@ -1559,11 +1589,11 @@ static int _mv88e6xxx_port_fid(struct dsa_switch *ds, int port, u16 *new,
 	if (ret < 0)
 		return ret;
 
-	fid |= (ret & PORT_CONTROL_1_FID_11_4_MASK) << 4;
+	fid |= (ret & upper_mask) << 4;
 
 	if (new) {
-		ret &= ~PORT_CONTROL_1_FID_11_4_MASK;
-		ret |= (*new >> 4) & PORT_CONTROL_1_FID_11_4_MASK;
+		ret &= ~upper_mask;
+		ret |= (*new >> 4) & upper_mask;
 
 		ret = _mv88e6xxx_reg_write(ds, REG_PORT(port), PORT_CONTROL_1,
 					   ret);
@@ -1627,7 +1657,7 @@ static int _mv88e6xxx_fid_new(struct dsa_switch *ds, u16 *fid)
 	 * databases are not needed. Return the next positive available.
 	 */
 	*fid = find_next_zero_bit(fid_bitmap, MV88E6XXX_N_FID, 1);
-	if (unlikely(*fid == MV88E6XXX_N_FID))
+	if (unlikely(*fid >= mv88e6xxx_num_databases(ds)))
 		return -ENOSPC;
 
 	/* Clear the database */