implement ice_start(), based on code from ixl(4)

remove hw->debug_mask, we are using the ice_debug global variable instead

gather ice(4) hardware counters for debugging

implement the ice(4) Rx interrupt handler

Add a work-in-progress version of ice(4), a driver for Intel E810 devices.
Ported from FreeBSD.

This driver does not pass packets yet, lots of code is still missing.
The driver will remain disabled

Add a work-in-progress version of ice(4), a driver for Intel E810 devices.
Ported from FreeBSD.

This driver does not pass packets yet, lots of code is still missing.
The driver will remain disabled in kernel configs until it is ready.

At this stage, code for device initialization should be fairly complete.
Some hardware features will require additional firmware packages to be
loaded. My plan is to get things working in the basic "safe mode" first,
which does not require external firmware.

I will continue working on this driver in-tree, with funding from genua.
Help is welcome.

ok dlg@

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