linux-kernel - Re: [PATCH 1/2] added stream id write support

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Date:	Tue, 21 Apr 2015 09:44:44 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	"kwan.huen" <kwan.huen@...sung.com>
Cc:	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	Keith Busch <keith.busch@...el.com>, Jens Axboe <axboe@...com>,
	Dimitri John Ledkov <dimitri.ledkov@...onical.com>,
	linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-api@...r.kernel.org
Subject: Re: [PATCH 1/2] added stream id write support

"kwan.huen" <kwan.huen@...sung.com> writes:

> ---
>  drivers/block/nvme-core.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
> index 85b8036..332341a 100644
> --- a/drivers/block/nvme-core.c
> +++ b/drivers/block/nvme-core.c
> @@ -769,6 +769,9 @@ static int nvme_submit_iod(struct nvme_queue *nvmeq, struct nvme_iod *iod,
>  	if (req->cmd_flags & REQ_RAHEAD)
>  		dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;
>  
> +	if (rq_data_dir(req))
> +		dsmgmt |= bio_get_streamid(req->bio) << 8;
> +

There's no public specification for this, yet.  How many bits are set
aside for the stream id?  Do you need to do bounds checking/input
validation?  What happens on adapters with older firmware when these
bits are set?

Cheers,
Jeff
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