[Bug 252316] [PATCH] add OCF offloading to ZFS

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252316

--- Comment #5 from John Baldwin <jhb@FreeBSD.org> ---
I don't think the patch is correct.  I think the issue is probably that you
aren't using a separate output buffer, and in the case that we aren't using a
separate buffer, we should just assert that the output_payload_start is 0 and
not check it otherwise.  Or perhaps you are using the output only for the
digest and not doing encryption?  In that case your patch might indeed be
correct.  I think though in that case we'd like to assert that
payload_output_start is not used (i.e. 0), something like:

 if (csp->mode == CSP_MODE_DIGEST)
   KASSERT(payload_output_start == 0)
 else
   /* existing test that output region fits in olen */

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