linux-kernel - RE: [EXT] [PATCH net-next 15/15] net: mvpp2: set the GMAC, XLG MAC, XPCS and MPCS in reset when a port is down

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Date:   Thu, 28 Feb 2019 15:00:34 +0000
From:   Yan Markman <ymarkman@...vell.com>
To:     Antoine Tenart <antoine.tenart@...tlin.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "thomas.petazzoni@...tlin.com" <thomas.petazzoni@...tlin.com>,
        "maxime.chevallier@...tlin.com" <maxime.chevallier@...tlin.com>,
        "gregory.clement@...tlin.com" <gregory.clement@...tlin.com>,
        "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        Nadav Haklai <nadavh@...vell.com>,
        Stefan Chulski <stefanc@...vell.com>,
        "mw@...ihalf.com" <mw@...ihalf.com>
Subject: RE: [EXT] [PATCH net-next 15/15] net: mvpp2: set the GMAC, XLG MAC,
 XPCS and MPCS in reset when a port is down

Hi

The eth-down/stop may concurrent with pre-scheduled stats_work.
So it seems better to cancel stats_work first and then make resetS.

Yan Markman

-----Original Message-----
From: Antoine Tenart <antoine.tenart@...tlin.com> 
Sent: Thursday, February 28, 2019 3:21 PM
To: davem@...emloft.net; linux@...linux.org.uk
Cc: Antoine Tenart <antoine.tenart@...tlin.com>; netdev@...r.kernel.org; linux-kernel@...r.kernel.org; thomas.petazzoni@...tlin.com; maxime.chevallier@...tlin.com; gregory.clement@...tlin.com; miquel.raynal@...tlin.com; Nadav Haklai <nadavh@...vell.com>; Stefan Chulski <stefanc@...vell.com>; Yan Markman <ymarkman@...vell.com>; mw@...ihalf.com
Subject: [EXT] [PATCH net-next 15/15] net: mvpp2: set the GMAC, XLG MAC, XPCS and MPCS in reset when a port is down

External Email

----------------------------------------------------------------------
This patch adds calls in the stop() helper to ensure both MACs and
both PCS blocks are set in reset when the user manually sets a port
down. This is done so that we have the exact same block reset states at
boot time and when a port is set down.

Signed-off-by: Antoine Tenart <antoine.tenart@...tlin.com>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 29d32cb3d52b..c10fd894c86f 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -3257,6 +3257,7 @@ static void mvpp2_stop_dev(struct mvpp2_port *port)
 
 	if (port->phylink)
 		phylink_stop(port->phylink);
+
 	phy_power_off(port->comphy);
 }
 
@@ -3520,6 +3521,9 @@ static int mvpp2_stop(struct net_device *dev)
 	mvpp2_cleanup_rxqs(port);
 	mvpp2_cleanup_txqs(port);
 
+	mvpp2_mac_reset(port);
+	mvpp22_pcs_reset(port);
+
 	cancel_delayed_work_sync(&port->stats_work);
 
 	return 0;
-- 
2.20.1