[Click] polling patch for e1000-7.3.20

[Massimiliano Poletto]

Matt Gordon at Mazu has succeeded where some of us had so far failed,
and has produced a stable polling patch for the latest (7.3.20)
version of the e1000 driver available on sourceforge.

It has been tested on various platforms, including the IBM x345/x346
and the Intel SR1500/SR2500, with various e1000 models, including the
82546GB and 82571EB, on both PCI-X and PCI-E buses.

Performance is good, comparable to or better than the old driver,
depending on the hardware configuration.  click-installs/uninstalls
under high load, which had been the major remaining cause of crashes
with my version of the driver, now work reliably.

Kudos to Matt for a job well done.  Many thanks also to Roman Chertov
for help and discussion when I was trying to get the driver working.

The patch is attached.  I hope it's useful.  If you see problems or
crashes, please let us know.

Regards,
max
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