[Bug 212454] [request] iSCSI hardware CRC32C support

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212454

--- Comment #4 from Edward Tomasz Napierala <trasz at FreeBSD.org> ---
Not sure, to be honest.  I don't really plan on taking on this at this point,
due to lack of time.  But I also think the PR is kind of titled wrong, for a
number of reasons.  First, CRC32C is optional in iSCSI, and disabled by default
- and for a reason, it can lower performance (obviously).  Second, I think we
actually do have CRC32C offload, along with other iSCSI offloads, in cxgbei. 
And third, iSCSI doesn't implement CRC32C; it just calls the calculate_crc32c()
routine.

So it's actually just about implementing optimized versions of
calculate_crc32c().

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