# \[PATCH net-next 5/5 v2\] net: dsa: rtl8366rb: Support fast aging

- From: Linus Walleij \<hidden\>
- Date: 2021-08-30 21:53:02 
- List: netdev
- Page: https://ratatoskr.run/netdev/2021/08/11210526
- Thread: https://ratatoskr.run/netdev/2021/08/11210521/t.md

```text
This implements fast aging per-port using the special "security"
register, which will flush any L2 LUTs on a port.

Suggested-by: Vladimir Oltean <olteanv@gmail.com>
Cc: Alvin Šipraga <redacted>
Cc: Mauri Sandberg <redacted>
Cc: DENG Qingfang <dqfext@gmail.com>
Signed-off-by: Linus Walleij <redacted>
---
ChangeLog v1->v2:
- New patch suggested by Vladimir.
---
 drivers/net/dsa/rtl8366rb.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/net/dsa/rtl8366rb.c b/drivers/net/dsa/rtl8366rb.c
index 4cb0e336ce6b..548282119cc4 100644
--- a/drivers/net/dsa/rtl8366rb.c
+++ b/drivers/net/dsa/rtl8366rb.c
@@ -1219,6 +1219,19 @@ rtl8366rb_port_bridge_flags(struct dsa_switch *ds, int port,
 	return 0;
 }
 
+static void
+rtl8366rb_port_fast_age(struct dsa_switch *ds, int port)
+{
+	struct realtek_smi *smi = ds->priv;
+
+	/* This will age out any L2 entries */
+	regmap_update_bits(smi->map, RTL8366RB_SECURITY_CTRL,
+			   BIT(port), BIT(port));
+	/* Restore the normal state of things */
+	regmap_update_bits(smi->map, RTL8366RB_SECURITY_CTRL,
+			   BIT(port), 0);
+}
+
 static int
 rtl8366rb_port_bridge_join(struct dsa_switch *ds, int port,
 			   struct net_device *bridge)
@@ -1673,6 +1686,7 @@ static const struct dsa_switch_ops rtl8366rb_switch_ops = {
 	.port_disable = rtl8366rb_port_disable,
 	.port_pre_bridge_flags = rtl8366rb_port_pre_bridge_flags,
 	.port_bridge_flags = rtl8366rb_port_bridge_flags,
+	.port_fast_age = rtl8366rb_port_fast_age,
 	.port_change_mtu = rtl8366rb_change_mtu,
 	.port_max_mtu = rtl8366rb_max_mtu,
 };
-- 
2.31.1

```