linux-kernel - Re: [PATCH 1/2] io_uring: Pass whole sqe to commands

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Message-ID: <ZE59RGJZd8DyDQaX@gmail.com>
Date:   Sun, 30 Apr 2023 07:37:58 -0700
From:   Breno Leitao <leitao@...ian.org>
To:     Christoph Hellwig <hch@....de>
Cc:     io-uring@...r.kernel.org, linux-nvme@...ts.infradead.org,
        asml.silence@...il.com, axboe@...nel.dk, leit@...com,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        sagi@...mberg.me, kbusch@...nel.org, ming.lei@...hat.com
Subject: Re: [PATCH 1/2] io_uring: Pass whole sqe to commands

On Thu, Apr 20, 2023 at 02:46:15PM +0200, Christoph Hellwig wrote:
> On Thu, Apr 20, 2023 at 05:38:02AM -0700, Breno Leitao wrote:
> > Since we are not coping the payload anymore, this is not necessary. Now
> > we are copying 64 bytes for the single SQE or 128 bytes for double SQE.
> > 
> > Do you prefer I create a helper that returns the SQE size, instead of
> > doing the left shift?
> 
> I think a helper would be nice.  And adding another sizeof(sqe) seems
> more self documenting then the shift, but if you really prefer the
> shift at least write a good comment explaining it.

Agree, this is a good idea. I've fixed it in the nvme code by creating a
function helper.
The same problem happen on the ublkd_drv, and I've also fixed it there
in a new patch.

	https://lkml.org/lkml/2023/4/30/94

Thanks for the review.