netdev - [PATCH net 2/2] net: mscc: ocelot: ANA_AUTOAGE_AGE_PERIOD holds a value in seconds, not ms

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Message-Id: <20200503222027.12991-3-olteanv@gmail.com>
Date:   Mon,  4 May 2020 01:20:27 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     davem@...emloft.net, netdev@...r.kernel.org
Cc:     idosch@...sch.org, allan.nielsen@...rochip.com,
        horatiu.vultur@...rochip.com, alexandre.belloni@...tlin.com,
        antoine.tenart@...tlin.com, andrew@...n.ch, f.fainelli@...il.com,
        vivien.didelot@...il.com, joergen.andreasen@...rochip.com,
        claudiu.manoil@....com, UNGLinuxDriver@...rochip.com,
        alexandru.marginean@....com, xiaoliang.yang_1@....com,
        yangbo.lu@....com, po.liu@....com, jiri@...lanox.com,
        kuba@...nel.org
Subject: [PATCH net 2/2] net: mscc: ocelot: ANA_AUTOAGE_AGE_PERIOD holds a value in seconds, not ms

From: Vladimir Oltean <vladimir.oltean@....com>

One may notice that automatically-learnt entries 'never' expire, even
though the bridge configures the address age period at 300 seconds.

Actually the value written to hardware corresponds to a time interval
1000 times higher than intended, i.e. 83 hours.

Fixes: a556c76adc05 ("net: mscc: Add initial Ocelot switch support")
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/ethernet/mscc/ocelot.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index 186ac4cd2ce6..5e47fed8a426 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -1464,8 +1464,15 @@ static void ocelot_port_attr_stp_state_set(struct ocelot *ocelot, int port,
 
 void ocelot_set_ageing_time(struct ocelot *ocelot, unsigned int msecs)
 {
-	ocelot_write(ocelot, ANA_AUTOAGE_AGE_PERIOD(msecs / 2),
-		     ANA_AUTOAGE);
+	unsigned int age_period = ANA_AUTOAGE_AGE_PERIOD(msecs / 2000);
+
+	/* Setting AGE_PERIOD to zero effectively disables automatic aging,
+	 * which is clearly not what our intention is. So avoid that.
+	 */
+	if (!age_period)
+		age_period = 1;
+
+	ocelot_rmw(ocelot, age_period, ANA_AUTOAGE_AGE_PERIOD_M, ANA_AUTOAGE);
 }
 EXPORT_SYMBOL(ocelot_set_ageing_time);
 
-- 
2.17.1