netdev - 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 16:06:00 +0100
From:   Antoine Tenart <antoine.tenart@...tlin.com>
To:     Yan Markman <ymarkman@...vell.com>
Cc:     Antoine Tenart <antoine.tenart@...tlin.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "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 Yan,

On Thu, Feb 28, 2019 at 03:00:34PM +0000, Yan Markman wrote:
> 
> The eth-down/stop may concurrent with pre-scheduled stats_work.
> So it seems better to cancel stats_work first and then make resetS.

I'm not sure this would actually result in an issue, but to keep it
logical I'll change that.

Thanks,
Antoine

> 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;

-- 
Antoine Ténart, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com