netdev - [RFC net-next 2/5] net: dsa: mv88e6xxx: add MV88E6XXX_G1_ATU_CTL_MAC

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Message-ID: <20250927070724.734933-3-lukeh@padl.com>
Date: Sat, 27 Sep 2025 17:07:05 +1000
From: Luke Howard <lukeh@...l.com>
To: netdev@...r.kernel.org
Cc: andrew@...n.ch, vladimir.oltean@....com, kieran@...nda.com,
        jcschroeder@...il.com, max@...tershome.org,
        Luke Howard <lukeh@...l.com>
Subject: [RFC net-next 2/5] net: dsa: mv88e6xxx: add MV88E6XXX_G1_ATU_CTL_MAC_AVB setter

Add accessors for the MACAVB bit, which controls whether certain ATU bits cause
the entry to be interpreted as AVB or NRL (non-rate-limiting) entries. This is
necessary on switches such as the 88E6352 and 88E6240 that support both AVB and
NRL ATU entries.

Signed-off-by: Luke Howard <lukeh@...l.com>
---
 drivers/net/dsa/mv88e6xxx/global1.h     |  2 ++
 drivers/net/dsa/mv88e6xxx/global1_atu.c | 17 +++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/drivers/net/dsa/mv88e6xxx/global1.h b/drivers/net/dsa/mv88e6xxx/global1.h
index 3dbb7a1b8fe11..74be4c485ab10 100644
--- a/drivers/net/dsa/mv88e6xxx/global1.h
+++ b/drivers/net/dsa/mv88e6xxx/global1.h
@@ -112,6 +112,7 @@
 /* Offset 0x0A: ATU Control Register */
 #define MV88E6XXX_G1_ATU_CTL		0x0a
 #define MV88E6XXX_G1_ATU_CTL_LEARN2ALL	0x0008
+#define MV88E6XXX_G1_ATU_CTL_MAC_AVB	0x8000
 #define MV88E6161_G1_ATU_CTL_HASH_MASK	0x0003
 
 /* Offset 0x0B: ATU Operation Register */
@@ -322,6 +323,7 @@ int mv88e6390_g1_rmu_disable(struct mv88e6xxx_chip *chip);
 int mv88e6xxx_g1_set_device_number(struct mv88e6xxx_chip *chip, int index);
 
 int mv88e6xxx_g1_atu_set_learn2all(struct mv88e6xxx_chip *chip, bool learn2all);
+int mv88e6xxx_g1_atu_set_mac_avb(struct mv88e6xxx_chip *chip, bool mac_avb);
 int mv88e6xxx_g1_atu_set_age_time(struct mv88e6xxx_chip *chip,
 				  unsigned int msecs);
 int mv88e6xxx_g1_atu_getnext(struct mv88e6xxx_chip *chip, u16 fid,
diff --git a/drivers/net/dsa/mv88e6xxx/global1_atu.c b/drivers/net/dsa/mv88e6xxx/global1_atu.c
index c47f068f56b32..429a1ee44e47d 100644
--- a/drivers/net/dsa/mv88e6xxx/global1_atu.c
+++ b/drivers/net/dsa/mv88e6xxx/global1_atu.c
@@ -41,6 +41,23 @@ int mv88e6xxx_g1_atu_set_learn2all(struct mv88e6xxx_chip *chip, bool learn2all)
 	return mv88e6xxx_g1_write(chip, MV88E6XXX_G1_ATU_CTL, val);
 }
 
+int mv88e6xxx_g1_atu_set_mac_avb(struct mv88e6xxx_chip *chip, bool mac_avb)
+{
+	u16 val;
+	int err;
+
+	err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_CTL, &val);
+	if (err)
+		return err;
+
+	if (mac_avb)
+		val |= MV88E6XXX_G1_ATU_CTL_MAC_AVB;
+	else
+		val &= ~MV88E6XXX_G1_ATU_CTL_MAC_AVB;
+
+	return mv88e6xxx_g1_write(chip, MV88E6XXX_G1_ATU_CTL, val);
+}
+
 int mv88e6xxx_g1_atu_set_age_time(struct mv88e6xxx_chip *chip,
 				  unsigned int msecs)
 {
-- 
2.43.0