linux-kernel - Re: [PATCH 1/3] nvme: Add Arbitration Burst support

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Message-ID: <20200624030637.GA66445@VM20190228-100.tbsite.net>
Date:   Wed, 24 Jun 2020 11:06:37 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     Keith Busch <kbusch@...nel.org>
Cc:     axboe@...com, hch@....de, sagi@...mberg.me, baolin.wang7@...il.com,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] nvme: Add Arbitration Burst support

On Tue, Jun 23, 2020 at 07:57:15PM -0700, Keith Busch wrote:
> On Tue, Jun 23, 2020 at 09:24:32PM +0800, Baolin Wang wrote:
> > +void nvme_set_arbitration_burst(struct nvme_ctrl *ctrl)
> > +{
> > +	u32 result;
> > +	int status;
> > +
> > +	if (!ctrl->rab)
> > +		return;
> > +
> > +	/*
> > +	 * The Arbitration Burst setting indicates the maximum number of
> > +	 * commands that the controller may launch at one time from a
> > +	 * particular Submission Queue. It is recommended that host software
> > +	 * configure the Arbitration Burst setting as close to the recommended
> > +	 * value by the controller as possible.
> > +	 */
> > +	status = nvme_set_features(ctrl, NVME_FEAT_ARBITRATION, ctrl->rab,
> 
> Since 'rab' is an 8-bit field, but the feature's AB value is only 3
> bits, we should add a validity check.

Sure.

> 
> > +}
> > +EXPORT_SYMBOL_GPL(nvme_set_arbitration_burst);
> 
> I don't see any particular reason to export this function just for the
> pci transport to use. Just make it a local static function an call it
> from nvme_init_identify().

OK. Thanks.