From: Rakesh Sankaranarayanan rakesh.sankaranarayanan@microchip.com
[ Upstream commit 6c977c5c2e4c5d8ad1b604724cc344e38f96fe9b ]
ALU table entry 2 register in KSZ9477 have bit positions reserved for forwarding port map. This field is referred in ksz9477_fdb_del() for clearing forward port map and alu table.
But current fdb_del refer ALU table entry 3 register for accessing forward port map. Update ksz9477_fdb_del() to get forward port map from correct alu table entry register.
With this bug, issue can be observed while deleting static MAC entries. Delete any specific MAC entry using "bridge fdb del" command. This should clear all the specified MAC entries. But it is observed that entries with self static alone are retained.
Tested on LAN9370 EVB since ksz9477_fdb_del() is used common across LAN937x and KSZ series.
Fixes: b987e98e50ab ("dsa: add DSA switch driver for Microchip KSZ9477") Signed-off-by: Rakesh Sankaranarayanan rakesh.sankaranarayanan@microchip.com Reviewed-by: Vladimir Oltean olteanv@gmail.com Link: https://lore.kernel.org/r/20230118174735.702377-1-rakesh.sankaranarayanan@mi... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/dsa/microchip/ksz9477.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/dsa/microchip/ksz9477.c b/drivers/net/dsa/microchip/ksz9477.c index 379b38c5844f..bf788e17f408 100644 --- a/drivers/net/dsa/microchip/ksz9477.c +++ b/drivers/net/dsa/microchip/ksz9477.c @@ -675,10 +675,10 @@ static int ksz9477_port_fdb_del(struct dsa_switch *ds, int port, ksz_read32(dev, REG_SW_ALU_VAL_D, &alu_table[3]);
/* clear forwarding port */ - alu_table[2] &= ~BIT(port); + alu_table[1] &= ~BIT(port);
/* if there is no port to forward, clear table */ - if ((alu_table[2] & ALU_V_PORT_MAP) == 0) { + if ((alu_table[1] & ALU_V_PORT_MAP) == 0) { alu_table[0] = 0; alu_table[1] = 0; alu_table[2] = 0;