netdev - RE: [PATCH V2 net-next 2/3] lan78xx: add ethtool set & get pause functions

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Date:	Fri, 19 Feb 2016 00:03:50 +0000
From:	<Woojung.Huh@...rochip.com>
To:	<ben@...adent.org.uk>, <davem@...emloft.net>
CC:	<netdev@...r.kernel.org>
Subject: RE: [PATCH V2 net-next 2/3] lan78xx: add ethtool set & get pause
 functions

> > Add ethtool operations of set_pauseram and get_pauseparm.
> [...]
> > +static void lan78xx_get_pause(struct net_device *net,
> > +			      struct ethtool_pauseparam *pause)
> > +{
> > +	struct lan78xx_net *dev = netdev_priv(net);
> > +	struct phy_device *phydev = net->phydev;
> > +	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
> > +
> > +	phy_ethtool_gset(phydev, &ecmd);
> > +
> > +	pause->autoneg = dev->fc_autoneg;
> > +
> > +	if (dev->fc_autoneg) {
> > +		if (dev->fc_autoneg_control & FLOW_CTRL_TX)
> > +			pause->tx_pause = 1;
> > +
> > +		if (dev->fc_autoneg_control & FLOW_CTRL_RX)
> > +			pause->rx_pause = 1;
> 
> This is incorrect; you should always return the manual settings
> (fc_request_control flags) here.  If autonegotiation is enabled then
> your get_settings function will return the actual pause flags.
> 
> Ben.

Ben, thanks for comments.
How about comment in include/uapi/linux/ethtool.h?
It says 
** struct ethtool_pauseparam - Ethernet pause (flow control) parameters
...
* If @autoneg is non-zero, the MAC is configured to send and/or
* receive pause frames according to the result of autonegotiation.

Doesn't this mean get_pauseparam() returns pause settings based on 
Result of autonegotation? Not manual settings of rx_param & tx_param?

Woojung