[PATCH net-next 4/4] net: dsa: mt7530: always install FDB entries with IVL and FID 1

[DENG Qingfang]

This reverts commit 7e777021780e ("mt7530 mt7530_fdb_write only set ivl
bit vid larger than 1").

Before this series, the default value of all ports' PVID is 1, which is
copied into the FDB entry, even if the ports are VLAN unaware. So
`bridge fdb show` will show entries like `dev swp0 vlan 1 self` even on
a VLAN-unaware bridge.

The blamed commit does not solve that issue completely, instead it may
cause a new issue that FDB is inaccessible in a VLAN-aware bridge with
PVID 1.

This series sets PVID to 0 on VLAN-unaware ports, so `bridge fdb show`
will no longer print `vlan 1` on VLAN-unaware bridges, and that special
case in fdb_write is not required anymore.

Set FDB entries' filter ID to 1 to match the VLAN table.

Signed-off-by: DENG Qingfang <dqfext at gmail.com>
---
RFC -> v1: Detailed commit message. Also set FDB entries' FID to 1.

 drivers/net/dsa/mt7530.c | 4 ++--
 drivers/net/dsa/mt7530.h | 1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 8d84d7ddad38..ac2b45e472bd 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -366,8 +366,8 @@ mt7530_fdb_write(struct mt7530_priv *priv, u16 vid,
 	int i;
 
 	reg[1] |= vid & CVID_MASK;
-	if (vid > 1)
-		reg[1] |= ATA2_IVL;
+	reg[1] |= ATA2_IVL;
+	reg[1] |= ATA2_FID(1);
 	reg[2] |= (aging & AGE_TIMER_MASK) << AGE_TIMER;
 	reg[2] |= (port_mask & PORT_MAP_MASK) << PORT_MAP;
 	/* STATIC_ENT indicate that entry is static wouldn't
diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h
index 53b7bb1f5368..73b0e0eb8f2f 100644
--- a/drivers/net/dsa/mt7530.h
+++ b/drivers/net/dsa/mt7530.h
@@ -80,6 +80,7 @@ enum mt753x_bpdu_port_fw {
 #define  STATIC_ENT			3
 #define MT7530_ATA2			0x78
 #define  ATA2_IVL			BIT(15)
+#define  ATA2_FID(x)			(((x) & 0x7) << 12)
 
 /* Register for address table write data */
 #define MT7530_ATWD			0x7c
-- 
2.25.1