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

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Date:   Thu, 20 Apr 2023 06:57:12 +0200
From:   Christoph Hellwig <hch@....de>
To:     Breno Leitao <leitao@...ian.org>
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, hch@....de, kbusch@...nel.org,
        ming.lei@...hat.com
Subject: Re: [PATCH 1/2] io_uring: Pass whole sqe to commands

On Wed, Apr 19, 2023 at 03:29:29AM -0700, Breno Leitao wrote:
>  	struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
> -	const struct nvme_uring_cmd *cmd = ioucmd->cmd;
> +	const struct nvme_uring_cmd *cmd = (struct nvme_uring_cmd *)ioucmd->sqe->cmd;

Please don't add the pointless cast.  And in general avoid the overly
long lines.

I suspect most other users should just also defined their structures
const instead of adding all theses casts thare are a sign of problems,
but that's a pre-existing issue.
>  	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
> -	size_t cmd_size;
> +	size_t size = sizeof(struct io_uring_sqe);
>  
>  	BUILD_BUG_ON(uring_cmd_pdu_size(0) != 16);
>  	BUILD_BUG_ON(uring_cmd_pdu_size(1) != 80);
>  
> -	cmd_size = uring_cmd_pdu_size(req->ctx->flags & IORING_SETUP_SQE128);
> +	if (req->ctx->flags & IORING_SETUP_SQE128)
> +		size <<= 1;


Why does this stop using uring_cmd_pdu_size()?