net: dsa: mv88e6xxx: rework ATU Remove

Add a fresh documented implementation of the ATU Move operation, and use
it to replace the current ATU Remove operation.

Note that not all Marvell switch chip support the ATU Move operation.
For those supporting it, the number of bits used to mask the destination
port may vary. 6352 and such use 4-bit, while 6390 use 5-bit. Thus add a
new atu_move_port_mask member in the info structure to describe the
presence and variant of ATU Move operation.

Note that the ATU Move operation is not documented in the 6185 datasheet
but the chip does support the operation.

All remaining _mv88e6xxx_atu_* functions are now unused as well as the
MV88E6XXX_FLAG_G1_ATU_FID flag, thus remove them.
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/global1.h

@@ -46,5 +46,7 @@ int mv88e6xxx_g1_atu_getnext(struct mv88e6xxx_chip *chip, u16 fid,
 int mv88e6xxx_g1_atu_loadpurge(struct mv88e6xxx_chip *chip, u16 fid,
 			       struct mv88e6xxx_atu_entry *entry);
 int mv88e6xxx_g1_atu_flush(struct mv88e6xxx_chip *chip, u16 fid, bool all);
+int mv88e6xxx_g1_atu_remove(struct mv88e6xxx_chip *chip, u16 fid, int port,
+			    bool all);
 
 #endif /* _MV88E6XXX_GLOBAL1_H */

drivers/net/dsa/mv88e6xxx/global1_atu.c

@@ -269,3 +269,32 @@ int mv88e6xxx_g1_atu_flush(struct mv88e6xxx_chip *chip, u16 fid, bool all)
 
 	return mv88e6xxx_g1_atu_flushmove(chip, fid, &entry, all);
 }
+
+static int mv88e6xxx_g1_atu_move(struct mv88e6xxx_chip *chip, u16 fid,
+				 int from_port, int to_port, bool all)
+{
+	struct mv88e6xxx_atu_entry entry = { 0 };
+	unsigned long mask;
+	int shift;
+
+	if (!chip->info->atu_move_port_mask)
+		return -EOPNOTSUPP;
+
+	mask = chip->info->atu_move_port_mask;
+	shift = bitmap_weight(&mask, 16);
+
+	entry.state = 0xf, /* Full EntryState means Move */
+	entry.portv_trunkid = from_port & mask;
+	entry.portv_trunkid |= (to_port & mask) << shift;
+
+	return mv88e6xxx_g1_atu_flushmove(chip, fid, &entry, all);
+}
+
+int mv88e6xxx_g1_atu_remove(struct mv88e6xxx_chip *chip, u16 fid, int port,
+			    bool all)
+{
+	int from_port = port;
+	int to_port = chip->info->atu_move_port_mask;
+
+	return mv88e6xxx_g1_atu_move(chip, fid, from_port, to_port, all);
+}

drivers/net/dsa/mv88e6xxx/mv88e6xxx.h

@@ -552,7 +552,6 @@ enum mv88e6xxx_cap {
 
 #define MV88E6XXX_FLAG_SERDES		BIT_ULL(MV88E6XXX_CAP_SERDES)
 
-#define MV88E6XXX_FLAG_G1_ATU_FID	BIT_ULL(MV88E6XXX_CAP_G1_ATU_FID)
 #define MV88E6XXX_FLAG_G1_VTU_FID	BIT_ULL(MV88E6XXX_CAP_G1_VTU_FID)
 
 #define MV88E6XXX_FLAG_GLOBAL2		BIT_ULL(MV88E6XXX_CAP_GLOBAL2)
@@ -595,8 +594,7 @@ enum mv88e6xxx_cap {
 	 MV88E6XXX_FLAGS_MULTI_CHIP)
 
 #define MV88E6XXX_FLAGS_FAMILY_6097	\
-	(MV88E6XXX_FLAG_G1_ATU_FID |	\
-	 MV88E6XXX_FLAG_G1_VTU_FID |	\
+	(MV88E6XXX_FLAG_G1_VTU_FID |	\
 	 MV88E6XXX_FLAG_GLOBAL2 |	\
 	 MV88E6XXX_FLAG_G2_INT |        \
 	 MV88E6XXX_FLAG_G2_MGMT_EN_2X |	\
@@ -609,8 +607,7 @@ enum mv88e6xxx_cap {
 	 MV88E6XXX_FLAGS_PVT)
 
 #define MV88E6XXX_FLAGS_FAMILY_6165	\
-	(MV88E6XXX_FLAG_G1_ATU_FID |	\
-	 MV88E6XXX_FLAG_G1_VTU_FID |	\
+	(MV88E6XXX_FLAG_G1_VTU_FID |	\
 	 MV88E6XXX_FLAG_GLOBAL2 |	\
 	 MV88E6XXX_FLAG_G2_INT |	\
 	 MV88E6XXX_FLAG_G2_MGMT_EN_2X |	\
@@ -642,7 +639,6 @@ enum mv88e6xxx_cap {
 
 #define MV88E6XXX_FLAGS_FAMILY_6341	\
 	(MV88E6XXX_FLAG_EEE |		\
-	 MV88E6XXX_FLAG_G1_ATU_FID |	\
 	 MV88E6XXX_FLAG_G1_VTU_FID |	\
 	 MV88E6XXX_FLAG_GLOBAL2 |	\
 	 MV88E6XXX_FLAG_G2_INT |	\
@@ -655,8 +651,7 @@ enum mv88e6xxx_cap {
 	 MV88E6XXX_FLAGS_SERDES)
 
 #define MV88E6XXX_FLAGS_FAMILY_6351	\
-	(MV88E6XXX_FLAG_G1_ATU_FID |	\
-	 MV88E6XXX_FLAG_G1_VTU_FID |	\
+	(MV88E6XXX_FLAG_G1_VTU_FID |	\
 	 MV88E6XXX_FLAG_GLOBAL2 |	\
 	 MV88E6XXX_FLAG_G2_INT |	\
 	 MV88E6XXX_FLAG_G2_MGMT_EN_2X |	\
@@ -670,7 +665,6 @@ enum mv88e6xxx_cap {
 
 #define MV88E6XXX_FLAGS_FAMILY_6352	\
 	(MV88E6XXX_FLAG_EEE |		\
-	 MV88E6XXX_FLAG_G1_ATU_FID |	\
 	 MV88E6XXX_FLAG_G1_VTU_FID |	\
 	 MV88E6XXX_FLAG_GLOBAL2 |	\
 	 MV88E6XXX_FLAG_G2_INT |	\
@@ -708,11 +702,15 @@ struct mv88e6xxx_info {
 	unsigned int g1_irqs;
 	enum dsa_tag_protocol tag_protocol;
 	unsigned long long flags;
+
+	/* Mask for FromPort and ToPort value of PortVec used in ATU Move
+	 * operation. 0 means that the ATU Move operation is not supported.
+	 */
+	u8 atu_move_port_mask;
 	const struct mv88e6xxx_ops *ops;
 };
 
 struct mv88e6xxx_atu_entry {
-	u16	fid;
 	u8	state;
 	bool	trunk;
 	u16	portv_trunkid;