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Re: esp vs. MSG_IGN_WIDE_RESIDUE
On Tue, 13 Jun 2017 21:24:38 -0000 (UTC)
mlelstv%serpens.de@localhost (Michael van Elst) wrote:
> macallan%netbsd.org@localhost (Michael) writes:
> >How would one correctly handle this - check if any read is followed by
> >one of these?
> The message should just correct the transfer length.
> I guess you always need to have the I/O buffer padded so that the
> invalid bytes can be stored. While you could handle the last bytes
> with PIO, the likely consequence is that you then also want to
> handle unaligned buffers. Few drivers support such use-cases.
So, since esp(4)'s SCSI bus can only ever be 16bit wide at most, it
can't be more than one byte that needs to be ignored? Since things work
otherwise I would assume that in this case the transfer length is
rounded up to be even.
And how likely are we to ever see unaligned buffers? On SPARC no less?
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