netdev - Re: [PATCH] net: phy: at803x: the Atheros 8031 supports pause frames

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Date:   Mon, 31 Oct 2016 16:14:26 -0500
From:   Timur Tabi <timur@...eaurora.org>
To:     Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org,
        zefir.kurtisi@...atec.com, scampbel@...eaurora.org,
        alokc@...eaurora.org, shankerd@...eaurora.org, andrew@...n.ch
Subject: Re: [PATCH] net: phy: at803x: the Atheros 8031 supports pause frames

Florian Fainelli wrote:
>>pause    asym_pause    enable tx?    enable rx?
>>-----    ----------    ----------    ----------
>>   0           0           No             No
>>   0           1           Yes            No
>>   1           0           Yes            Yes
>>   1           1           No             Yes
>>
>>The last two seem backwards.  The internal driver enables RX and TX if
>>pause and asym_pause is enabled.

Is this chart correct?  I see drivers handle this differently.

nb8800_pause_config() has this:

	priv->pause_rx = phydev->pause;
	priv->pause_tx = phydev->pause ^ phydev->asym_pause;

But bcm_sf2_sw_adjust_link() does this:

	if (phydev->pause) {
		if (phydev->asym_pause)
			reg |= TX_PAUSE_EN;
		reg |= RX_PAUSE_EN;
	}

Which one is correct?

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