linux-kernel - Re: [PATCH RESEND 0/1] AHCI: Optimize interrupt processing

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Message-ID: <20130729115011.GC20951@mtj.dyndns.org>
Date:	Mon, 29 Jul 2013 07:50:11 -0400
From:	Tejun Heo <tj@...nel.org>
To:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Cc:	Jens Axboe <axboe@...nel.dk>,
	Alexander Gordeev <agordeev@...hat.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Mike Christie <michaelc@...wisc.edu>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	Jeff Garzik <jgarzik@...ox.com>,
	linux-scsi <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH RESEND 0/1] AHCI: Optimize interrupt processing

Yo,

On Fri, Jul 26, 2013 at 05:43:13PM -0700, Nicholas A. Bellinger wrote:
> Considering there can be more than a single ata_device hanging off each
> ata_port, the '*sdev = ap->link.device[0].sdev' in __ata_qc_from_tag()
> is definitely bogus, but I'm not sure how else to correlate
> blk-mq/scsi-mq per device descriptors to existing code expecting
> ata_port->qcmd[] descriptors to be shared across multiple devices..
> 
> Tejun..?

I have no idea.  Let's please just do simpler conversion and worry
about embedding qc's into scsi_cmnds later.  libata isn't a normal
SCSI driver and has a rather its own thick midlayer doing the
impedance matching inbetween && I really don't think there is too much
benefit to be reaped from embedding qc's into scsi_cmnds.

Thanks.

-- 
tejun
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