[PATCH net-next v4 7/8] net: dsa: mt7530: implement port_fast_age
From: Daniel Golle <daniel@makrotopia.org>
Date: 2026-07-19 17:54:27
Also in:
linux-arm-kernel, linux-mediatek, lkml
Subsystem:
mediatek switch driver, networking drivers, networking [dsa], the rest · Maintainers:
Chester A. Unal, Daniel Golle, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Vladimir Oltean, Linus Torvalds
Implement the .port_fast_age DSA operation by flushing all non-static (dynamically learned) MAC address entries from the address table. The switch does not offer a combined "non-static AND per-port" match mode, so the flush is global and the port argument is not used. Unlike b53 and realtek, which flush the dynamic entries of the affected port only, an STP topology change on one port therefore also flushes the dynamically learned entries of the other ports; they are quickly relearned. Access the address table control register under priv->reg_mutex, as done by all other ATC users (FDB and MDB add/del/dump), to serialise the write-then-poll command sequence, and log a message should the flush time out. Signed-off-by: Daniel Golle <daniel@makrotopia.org> --- v3: * take reg_mutex around the ATC flush and log on timeout * align the ATC_MAT_NON_STATIC_MAC define * correct the commit message which wrongly claimed per-port parity with b53/realtek --- drivers/net/dsa/mt7530.c | 23 +++++++++++++++++++++++ drivers/net/dsa/mt7530.h | 1 + 2 files changed, 24 insertions(+)
diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index f7643b86f3c4..52b549d7ee22 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c@@ -193,6 +193,28 @@ mt7530_fdb_cmd(struct mt7530_priv *priv, enum mt7530_fdb_cmd cmd, u32 *rsp) return 0; } +static void mt7530_port_fast_age(struct dsa_switch *ds, int port) +{ + struct mt7530_priv *priv = ds->priv; + struct mt7530_dummy_poll p; + u32 val; + int ret; + + mutex_lock(&priv->reg_mutex); + + /* Flush all non-static MAC address entries */ + val = ATC_BUSY | ATC_MAT_NON_STATIC_MAC | MT7530_FDB_FLUSH; + regmap_write(priv->regmap, MT7530_ATC, val); + + INIT_MT7530_DUMMY_POLL(&p, priv, MT7530_ATC); + ret = readx_poll_timeout(mt7530_mii_poll, &p, val, + !(val & ATC_BUSY), 20, 20000); + if (ret < 0) + dev_err(priv->dev, "fast age timeout\n"); + + mutex_unlock(&priv->reg_mutex); +} + static void mt7530_fdb_read(struct mt7530_priv *priv, struct mt7530_fdb *fdb) {
@@ -3319,6 +3341,7 @@ static const struct dsa_switch_ops mt7530_switch_ops = { .port_bridge_flags = mt7530_port_bridge_flags, .port_bridge_join = mt7530_port_bridge_join, .port_bridge_leave = mt7530_port_bridge_leave, + .port_fast_age = mt7530_port_fast_age, .port_fdb_add = mt7530_port_fdb_add, .port_fdb_del = mt7530_port_fdb_del, .port_fdb_dump = mt7530_port_fdb_dump,
diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h
index 804c2e0991a0..241e3d460357 100644
--- a/drivers/net/dsa/mt7530.h
+++ b/drivers/net/dsa/mt7530.h@@ -165,6 +165,7 @@ enum mt753x_to_cpu_fw { #define ATC_MAT_MASK GENMASK(11, 8) #define ATC_MAT(x) FIELD_PREP(ATC_MAT_MASK, x) #define ATC_MAT_MACTAB ATC_MAT(0) +#define ATC_MAT_NON_STATIC_MAC ATC_MAT(4) enum mt7530_fdb_cmd { MT7530_FDB_READ = 0,
--
2.55.0