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Re: ata(4) and NCQ

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
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

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