linux-kernel - Re: [PATCH] libata: add support for NCQ commands for SG interface

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Message-ID: <20151023053945.GA24618@mtj.duckdns.org>
Date:	Fri, 23 Oct 2015 14:39:45 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Vinayak Kale <vinayak.kale@...gate.com>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	Vinayak Kale <vinayak.kale@...il.com>,
	sumit.g.gupta@...gate.com
Subject: Re: [PATCH] libata: add support for NCQ commands for SG interface

Hello,

On Fri, Oct 23, 2015 at 10:01:35AM +0530, Vinayak Kale wrote:
> > It looks like it'd work given that it's forcing qc->tag into
> > tf->nsect.  What's the use case tho?
> 
> We need to issue NCQ commands with priority bit from user space application.
> 
> BTW, Sergei Shtylyov raised concern regarding usefulness of adding
> ATA_TFLAG_LBA to tf->flags. Can you please comment on that as well?
> Accordingly I will either keep it or discard it in V2. Thanks.

I like the change but can you please put that in a separate patch?
Also, can you please verify that this works fine with multiple regular
NCQ commands in flight?

Thanks.

-- 
tejun
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