netdev - r8169, enabling TX checksumming breaks things?

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Message-Id: <200909230915.27854.denys@visp.net.lb>
Date:	Wed, 23 Sep 2009 09:15:27 +0300
From:	Denys Fedoryschenko <denys@...p.net.lb>
To:	romieu@...zoreil.com, netdev@...r.kernel.org
Subject: r8169, enabling TX checksumming breaks things?

Hi

Is it expected that:
1)TX checksumming is off by default
2)If i try to enable it over ethtool -K eth0 tx on , TCP sessions on proxy 
getting stuck, even in tcpdump looks everything fine and packets reaching 
destination, i don't understand what is a reason of failure.
Maybe if this feature supposed to not work - user must not be able just to 
turn it on?

Checksum OFF, connection established, no data received.
www.nuclearcat.com/files/r8169_tx_off.txt

Checksum ON, connection established, no data received.
www.nuclearcat.com/files/r8169_tx_on.txt

If required i can capture binary pcap files.
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