Compact PCI Ethernet Driver Hardening

Compact PCI Ethernet Driver Hardening


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Posted by Carl Burmeister on October 25, 2001 at 14:25:52:

This post is about driver hardening and since the
driver I have chosen to illustrate the process is for
the DEC 21040 chip/CompactPCI line card I decided to
run the question by the readers of this particular
forum.

The question is what is meant by the term "Hardened
Driver". I understand it to mean at a very high level
that the driver will not degrade the performance of
the OS, that it will not corrupt kernel space and that
it will not crash the kernel. In addition, it should
be able to detect when things are nearing a faulted
situation and to attempt recovery. Barring that, it
should uninstall itself (yes - I forgot to mention -
we are talking about dynamic drivers) in such a way
that the hardware may be successfully controlled by
a fresh instance of the driver.

After reviewing the existing driver, I am having
trouble defining what this means at a practical,
low level.

Any thought on this subject would be greatly
appreciated.

Thanks,
Carl


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