linux-kernel - [PATCH 5.6 028/194] net: mscc: ocelot: ANA_AUTOAGE_AGE

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Message-Id: <20200518173533.868434176@linuxfoundation.org>
Date:   Mon, 18 May 2020 19:35:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Vladimir Oltean <vladimir.oltean@....com>,
        Florian Faineli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.6 028/194] net: mscc: ocelot: ANA_AUTOAGE_AGE_PERIOD holds a value in seconds, not ms

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

[ Upstream commit c0d7eccbc76115b7eb337956c03d47d6a889cf8c ]

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>
Reviewed-by: Florian Faineli <f.fainelli@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/mscc/ocelot.c |   11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -1444,8 +1444,15 @@ static void ocelot_port_attr_stp_state_s
 
 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);