[DESC 2.6.8.1-mm4] r8169 patches

[Francois Romieu <romieu@xxxxxxxxxxxxx>]

Here comes a new serie of r8169 related patches which should allow
the motivated users to experiment new features, namely:
- Rx/Tx checksum offload;
- vlan support;
- better ethtool integration.

Tx code apart, the changes exhibit some strong similarity with the
8139cp driver.

I have not done vlan-dedicated test and there are no figures to highlight
any performance improvement. The code does not crash in a (really slow)
debug enabled -mm kernel and it does not seem to add huge leak.

Remarks/comments/test reports welcome.

--
Ueimor