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Date:   Wed,  1 May 2019 22:45:05 +0200
From:   Hauke Mehrtens <hauke@...ke-m.de>
To:     davem@...emloft.net
Cc:     andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        netdev@...r.kernel.org, Hauke Mehrtens <hauke@...ke-m.de>
Subject: [PATCH 4/5] net: dsa: lantiq: Add fast age function

Fast aging per port is not supported directly by the hardware, it is
only possible to configure a global aging time.

Do the fast aging by iterating over the MAC forwarding table and remove
all dynamic entries for a given port.

Signed-off-by: Hauke Mehrtens <hauke@...ke-m.de>
---
 drivers/net/dsa/lantiq_gswip.c | 38 ++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c
index 23686b8399ea..ef8e2a827e16 100644
--- a/drivers/net/dsa/lantiq_gswip.c
+++ b/drivers/net/dsa/lantiq_gswip.c
@@ -1221,6 +1221,43 @@ static int gswip_port_vlan_del(struct dsa_switch *ds, int port,
 	return 0;
 }
 
+static void gswip_port_fast_age(struct dsa_switch *ds, int port)
+{
+	struct gswip_priv *priv = ds->priv;
+	struct gswip_pce_table_entry mac_bridge = {0,};
+	int i;
+	int err;
+
+	for (i = 0; i < 2048; i++) {
+		mac_bridge.table = GSWIP_TABLE_MAC_BRIDGE;
+		mac_bridge.index = i;
+
+		err = gswip_pce_table_entry_read(priv, &mac_bridge);
+		if (err) {
+			dev_err(priv->dev, "failed to read mac brigde: %d\n",
+				err);
+			return;
+		}
+
+		if (!mac_bridge.valid)
+			continue;
+
+		if (mac_bridge.val[1] & 0x01)
+			continue;
+
+		if (((mac_bridge.val[0] & GENMASK(7, 4)) >> 4) != port)
+			continue;
+
+		mac_bridge.valid = false;
+		err = gswip_pce_table_entry_write(priv, &mac_bridge);
+		if (err) {
+			dev_err(priv->dev, "failed to write mac brigde: %d\n",
+				err);
+			return;
+		}
+	}
+}
+
 static void gswip_port_stp_state_set(struct dsa_switch *ds, int port, u8 state)
 {
 	struct gswip_priv *priv = ds->priv;
@@ -1461,6 +1498,7 @@ static const struct dsa_switch_ops gswip_switch_ops = {
 	.port_disable		= gswip_port_disable,
 	.port_bridge_join	= gswip_port_bridge_join,
 	.port_bridge_leave	= gswip_port_bridge_leave,
+	.port_fast_age		= gswip_port_fast_age,
 	.port_vlan_filtering	= gswip_port_vlan_filtering,
 	.port_vlan_prepare	= gswip_port_vlan_prepare,
 	.port_vlan_add		= gswip_port_vlan_add,
-- 
2.20.1

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