netdev - [PATCH v4 net-next 06/11] net: mscc: ocelot: disable flow control on NPI interface

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Message-Id: <20200713165711.2518150-7-olteanv@gmail.com>
Date:   Mon, 13 Jul 2020 19:57:06 +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
Subject: [PATCH v4 net-next 06/11] 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>
Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
---
Changes in v4:
None.

Changes in v3:
None.

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 aca805b9c0b3..2a44305912d2 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -1401,6 +1401,10 @@ 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