Since Intel agreed to submit further updates via broken-up patches
like they do currently (and admirably) for e1000 and e100, I agreed
to merge this update to bring the driver up to speed.

Contributed by: Ayyappan.Veeraiyan@intel.com

Changes:

Features implemented

*	Support for new 850nm adapters.
*	Copyright notice updated to include year 2004.
*	Fix for "ixgb does not maintain non-default MTU setting across a
link loss" issue - When link loss happens in non-default MTU
environment, driver will incorrectly operate with default 1500 MTU
setting.
*	Netpoll support added
*	Ethtool support - status functionality, FlowControl interface,
Checksum interface, TSO and Scatter Gather interfaces
*	Race condition fix - Race condition (TX path) exists between
ixgb_xmit_frame and clean_tx_irq routines in handling the queue.
* 	Removed dead code segments (#if 0)


Performance improvement features 
*	Mod operator usage is removed - used to cause performance
problems in non-IA architecture based machines
*	Multiple ICR register read in ISR is avoided
*	RS bit set on only 'end of packet' TX descriptors - to avoid
multiple writebacks by controller for packets with multiple descriptors.
*	RX descriptors prefetch is done - improved 1500 MTU TX
performance


All relevant e1000 driver cleanups ported to ixgb
*	Valid error propagation in functions ixgb_up, ixgb_probe,
ixgb_open. 
* 	NAPI code cleanups
* 	u8, u16 and u32 data types are changed to uint8_t, uint16_t and
uint32_t respectively. We use these types on our shared code for
multiple OSes and also to make it uniform with e1000 driver.
*	Some functions in ixgb_main.c are moved to different location -
This enables easy porting of e1000 bug fixes to ixgb