netdev - [PATCH net-next 08/11] net: mscc: ocelot: disable flow control on NPI interface

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Message-Id: <20200527234113.2491988-9-olteanv@gmail.com>
Date:   Thu, 28 May 2020 02:41:10 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, andrew@...n.ch, vivien.didelot@...il.com,
        f.fainelli@...il.com, linux@...linux.org.uk,
        antoine.tenart@...tlin.com, alexandre.belloni@...tlin.com,
        horatiu.vultur@...rochip.com, allan.nielsen@...rochip.com,
        UNGLinuxDriver@...rochip.com, alexandru.marginean@....com,
        claudiu.manoil@....com, madalin.bucur@....nxp.com,
        radu-andrei.bulie@....com, fido_max@...ox.ru
Subject: [PATCH net-next 08/11] net: mscc: ocelot: disable flow control on NPI interface

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

The Ocelot switches do not support flow control on Ethernet interfaces
where a DSA tag must be added. If pause frames are enabled, they will be
encapsulated in the DSA tag just like regular frames, and the DSA master
will not recognize them.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/ethernet/mscc/ocelot.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index 6fc5b72c9260..41d1026ec5b3 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -2200,6 +2200,10 @@ void ocelot_configure_cpu(struct ocelot *ocelot, int npi,
 				    extraction);
 		ocelot_fields_write(ocelot, npi, SYS_PORT_MODE_INCL_INJ_HDR,
 				    injection);
+
+		/* Disable transmission of pause frames */
+		ocelot_rmw_rix(ocelot, 0, SYS_PAUSE_CFG_PAUSE_ENA,
+			       SYS_PAUSE_CFG, npi);
 	}
 
 	/* Enable CPU port module */
-- 
2.25.1