netdev - Re: [PATCH] net: mvpp2: clear flow control modes in 10G mode

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Date:   Sat, 9 Feb 2019 16:07:08 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Antoine Tenart <antoine.tenart@...tlin.com>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>
Cc:     Baruch Siach <baruch@...s.co.il>,
        Sven Auhagen <sven.auhagen@...eatech.de>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] net: mvpp2: clear flow control modes in 10G mode

Please ignore this one - subject line is not correct.  Thanks.

On Sat, Feb 09, 2019 at 04:06:13PM +0000, Russell King wrote:
> When mvpp2 configures the flow control modes in mvpp2_xlg_config() for
> 10G mode, it only ever set the flow control enable bits.  There is no
> mechanism to clear these bits, which means that userspace is unable to
> use standard APIs to disable flow control (the only way is to poke the
> register directly.)
> 
> Fix the missing bit clearance to allow flow control to be disabled.
> This means that, by default, as there is no negotiation in 10G modes
> with mvpp2, flow control is now disabled rather than being rx-only.
> 
> Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
> ---
>  drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> index b63fac6ee2e6..199e6f17ee1b 100644
> --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> @@ -4532,8 +4532,13 @@ static void mvpp2_xlg_config(struct mvpp2_port *port, unsigned int mode,
>  
>  	if (state->pause & MLO_PAUSE_TX)
>  		ctrl0 |= MVPP22_XLG_CTRL0_TX_FLOW_CTRL_EN;
> +	else
> +		ctrl0 &= ~MVPP22_XLG_CTRL0_TX_FLOW_CTRL_EN;
> +
>  	if (state->pause & MLO_PAUSE_RX)
>  		ctrl0 |= MVPP22_XLG_CTRL0_RX_FLOW_CTRL_EN;
> +	else
> +		ctrl0 &= ~MVPP22_XLG_CTRL0_RX_FLOW_CTRL_EN;
>  
>  	ctrl4 &= ~MVPP22_XLG_CTRL4_MACMODSELECT_GMAC;
>  	ctrl4 |= MVPP22_XLG_CTRL4_FWD_FC | MVPP22_XLG_CTRL4_FWD_PFC |
> -- 
> 2.7.4
> 
> 

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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