netdev - [PATCH v2 net-next 08/13] net: mscc: ocelot: disable flow control on NPI interface

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Message-Id: <20200530115142.707415-9-olteanv@gmail.com>
Date:   Sat, 30 May 2020 14:51:37 +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, antoine.tenart@...tlin.com,
        alexandre.belloni@...tlin.com, UNGLinuxDriver@...rochip.com,
        alexandru.marginean@....com, claudiu.manoil@....com,
        madalin.bucur@....nxp.com, radu-andrei.bulie@....com,
        fido_max@...ox.ru, broonie@...nel.org
Subject: [PATCH v2 net-next 08/13] 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>
---
Changes in v2:
None.

 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 d9b0918080c5..c36d29974092 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -2202,6 +2202,10 @@ 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