[Bug 272780] genet: General question of DMA alignment requirement for tx/rx_buf

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272780

Mark Johnston <markj@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |karels@freebsd.org,
                   |                            |markj@FreeBSD.org
             Status|New                         |Open

--- Comment #1 from Mark Johnston <markj@FreeBSD.org> ---
CC'ing Mike Karels, who imported the driver.

I suspect that genet does this so that the IP header is 4-byte aligned, since
that could make accesses to header fields more efficient.  But indeed, it's
rather strange that rx_buf_tag is defined with an alignment of 4.  I'd expect
that to result in extra copying.

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