Re: ata(4) and NCQ

[Frank van der Linden <fvdl%netbsd.org@localhost>]

On 4/26/11 5:05 AM, Manuel Bouyer wrote:
> The ATA layer doesn't yet support multiple outstanding commands, but
> some provision for this is already there: for example, wd_softc has a
> openings member, we have a queue of commands. What's missing is tag handling
> in the wd driver; idea can probably be borrowed from the scsipi layer
> (scsipi_{get,put}_tag()).
> The code is so small I'm not sure it's worth trying to share it.
Once upon a long time ago, I added NCQ support to the ATA layer (for 
Wasabi, so I assume that code is legally lost now). Like you said, it 
isn't as complicated as it sounds, and I don't think it's worth it 
sharing with the SCSI code at this point.

- Frank