netdev - TX vs RX pause frame question

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Message-ID: <1490523071.3177.56.camel@kernel.crashing.org>
Date:   Sun, 26 Mar 2017 21:11:11 +1100
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     netdev@...r.kernel.org
Subject: TX vs RX pause frame question

Hi !

It's not 100% clear to me looking at various drivers what is
considered "rx_pause" and what is "tx_pause" (from the ethtool
terminology).

Is "rx_pause" about receiving pause frame to throttle the transmitter
or is it about sending pause frames when the receiver gets full ?

Thanks,
Ben.