netdev - [PATCH net] net: dsa: felix: re-enable TX flow control in ocelot_port

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Message-Id: <20210608111535.4084131-1-olteanv@gmail.com>
Date:   Tue,  8 Jun 2021 14:15:35 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Michael Walle <michael@...le.cc>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        UNGLinuxDriver@...rochip.com,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: [PATCH net] net: dsa: felix: re-enable TX flow control in ocelot_port_flush()

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

Because flow control is set up statically in ocelot_init_port(), and not
in phylink_mac_link_up(), what happens is that after the blamed commit,
the flow control remains disabled after the port flushing procedure.

Fixes: eb4733d7cffc ("net: dsa: felix: implement port flushing on .phylink_mac_link_down")
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/ethernet/mscc/ocelot.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index 0c4283319d7f..adfb9781799e 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -379,6 +379,7 @@ static u32 ocelot_read_eq_avail(struct ocelot *ocelot, int port)
 
 int ocelot_port_flush(struct ocelot *ocelot, int port)
 {
+	unsigned int pause_ena;
 	int err, val;
 
 	/* Disable dequeuing from the egress queues */
@@ -387,6 +388,7 @@ int ocelot_port_flush(struct ocelot *ocelot, int port)
 		       QSYS_PORT_MODE, port);
 
 	/* Disable flow control */
+	ocelot_fields_read(ocelot, port, SYS_PAUSE_CFG_PAUSE_ENA, &pause_ena);
 	ocelot_fields_write(ocelot, port, SYS_PAUSE_CFG_PAUSE_ENA, 0);
 
 	/* Disable priority flow control */
@@ -422,6 +424,9 @@ int ocelot_port_flush(struct ocelot *ocelot, int port)
 	/* Clear flushing again. */
 	ocelot_rmw_gix(ocelot, 0, REW_PORT_CFG_FLUSH_ENA, REW_PORT_CFG, port);
 
+	/* Re-enable flow control */
+	ocelot_fields_write(ocelot, port, SYS_PAUSE_CFG_PAUSE_ENA, pause_ena);
+
 	return err;
 }
 EXPORT_SYMBOL(ocelot_port_flush);
-- 
2.25.1