netdev - Re: [PATCH RFC net-next 7/9] net: pcs: xpcs: correct pause resolution

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Date: Sat, 13 May 2023 19:47:35 +0200
From: Andrew Lunn <andrew@...n.ch>
To: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
Cc: Jose Abreu <Jose.Abreu@...opsys.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH RFC net-next 7/9] net: pcs: xpcs: correct pause resolution

On Fri, May 12, 2023 at 06:27:35PM +0100, Russell King (Oracle) wrote:
> xpcs was indicating symmetric pause should be enabled regardless of
> the advertisements by either party. Fix this to use
> linkmode_resolve_pause() now that we're no longer obliterating the
> link partner's advertisement by logically anding it with our own.
> 
> Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
> ---
>  drivers/net/pcs/pcs-xpcs.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
> index 43115d04c01a..beed799a69a7 100644
> --- a/drivers/net/pcs/pcs-xpcs.c
> +++ b/drivers/net/pcs/pcs-xpcs.c
> @@ -538,11 +538,20 @@ static void xpcs_resolve_lpa_c73(struct dw_xpcs *xpcs,
>  				 struct phylink_link_state *state)
>  {
>  	__ETHTOOL_DECLARE_LINK_MODE_MASK(res);
> +	bool tx_pause, rx_pause;
>  
>  	/* Calculate the union of the advertising masks */
>  	linkmode_and(res, state->lp_advertising, state->advertising);
>  
> -	state->pause = MLO_PAUSE_TX | MLO_PAUSE_RX;
> +	/* Resolve pause modes */
> +	linkmode_resolve_pause(state->advertising, state->lp_advertising,
> +			       &tx_pause, &rx_pause);
> +
> +	if (tx_pause)
> +		state->pause |= MLO_PAUSE_TX;
> +	if (rx_pause)
> +		state->pause |= MLO_PAUSE_RX;
> +

Hi Russell

I must be missing something. Why not use phylink_resolve_an_pause()?

	Andrew