[PATCH net-next] net: dsa: mt7530: support setting ageing time

DENG Qingfang
2020-12-08T07:00:55Z

MT7530 has a global address age control register, so use it to set
ageing time.

The applied timer is (AGE_CNT + 1) * (AGE_UNIT + 1) seconds

Signed-off-by: DENG Qingfang <dqfext@gmail.com>
---
drivers/net/dsa/mt7530.c | 41 ++++++++++++++++++++++++++++++++++++++++
drivers/net/dsa/mt7530.h | 13 +++++++++++++
2 files changed, 54 insertions(+)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 6408402a44f5..99bf8fed6536 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -870,6 +870,46 @@ mt7530_get_sset_count(struct dsa_switch *ds, int port, int sset)
return ARRAY_SIZE(mt7530_mib);
}

+static int
+mt7530_set_ageing_time(struct dsa_switch *ds, unsigned int msecs)
+{
+ struct mt7530_priv *priv = ds->priv;
+ unsigned int secs = msecs / 1000;
+ unsigned int tmp_age_count;
+ unsigned int error = -1;
+ unsigned int age_count;
+ unsigned int age_unit;
+
+ /* Applied timer is (AGE_CNT + 1) * (AGE_UNIT + 1) seconds */
+ if (secs < 1 || secs > (AGE_CNT_MAX + 1) * (AGE_UNIT_MAX + 1))
+ return -ERANGE;
+
+ /* iterate through all possible age_count to find the closest pair */
+ for (tmp_age_count = 0; tmp_age_count <= AGE_CNT_MAX; ++tmp_age_count) {
+ unsigned int tmp_age_unit = secs / (tmp_age_count + 1) - 1;
+
+ if (tmp_age_unit <= AGE_UNIT_MAX) {
+ unsigned int tmp_error = secs -
+ (tmp_age_count + 1) * (tmp_age_unit + 1);
+
+ /* found a closer pair */
+ if (error > tmp_error) {
+ error = tmp_error;
+ age_count = tmp_age_count;
+ age_unit = tmp_age_unit;
+ }
+
+ /* found the exact match, so break the loop */
+ if (!error)
+ break;
+ }
+ }
+
+ mt7530_write(priv, MT7530_AAC, AGE_CNT(age_count) | AGE_UNIT(age_unit));
+
+ return 0;
+}
+
static void mt7530_setup_port5(struct dsa_switch *ds, phy_interface_t interface)
{
struct mt7530_priv *priv = ds->priv;
@@ -2564,6 +2604,7 @@ static const struct dsa_switch_ops mt7530_switch_ops = {
.phy_write = mt753x_phy_write,
.get_ethtool_stats = mt7530_get_ethtool_stats,
.get_sset_count = mt7530_get_sset_count,
+ .set_ageing_time = mt7530_set_ageing_time,
.port_enable = mt7530_port_enable,
.port_disable = mt7530_port_disable,
.port_change_mtu = mt7530_port_change_mtu,
diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h
index ee3523a7537e..32d8969b3ace 100644
--- a/drivers/net/dsa/mt7530.h
+++ b/drivers/net/dsa/mt7530.h
@@ -161,6 +161,19 @@ enum mt7530_vlan_egress_attr {
MT7530_VLAN_EGRESS_STACK = 3,
};

+/* Register for address age control */
+#define MT7530_AAC 0xa0
+/* Disable ageing */
+#define AGE_DIS BIT(20)
+/* Age count */
+#define AGE_CNT_MASK GENMASK(19, 12)
+#define AGE_CNT_MAX 0xff
+#define AGE_CNT(x) (AGE_CNT_MASK & ((x) << 12))
+/* Age unit */
+#define AGE_UNIT_MASK GENMASK(11, 0)
+#define AGE_UNIT_MAX 0xfff
+#define AGE_UNIT(x) (AGE_UNIT_MASK & (x))
+
/* Register for port STP state control */
#define MT7530_SSP_P(x) (0x2000 + ((x) * 0x100))
#define FID_PST(x) ((x) & 0x3)
--
2.25.1