linux-kernel - Re: [PATCH 1/2] scsi_host: add support for request batching

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Message-ID: <ad0578b0-ce73-85ed-b67d-70c5d8176a23@acm.org>
Date:   Thu, 30 May 2019 08:36:30 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     jejb@...ux.ibm.com, martin.petersen@...cle.com,
        linux-scsi@...r.kernel.org, stefanha@...hat.com
Subject: Re: [PATCH 1/2] scsi_host: add support for request batching

On 5/30/19 4:28 AM, Paolo Bonzini wrote:
> +static const struct blk_mq_ops scsi_mq_ops_no_commit = {
> +	.get_budget	= scsi_mq_get_budget,
> +	.put_budget	= scsi_mq_put_budget,
> +	.queue_rq	= scsi_queue_rq,
> +	.complete	= scsi_softirq_done,
> +	.timeout	= scsi_timeout,
> +#ifdef CONFIG_BLK_DEBUG_FS
> +	.show_rq	= scsi_show_rq,
> +#endif
> +	.init_request	= scsi_mq_init_request,
> +	.exit_request	= scsi_mq_exit_request,
> +	.initialize_rq_fn = scsi_initialize_rq,
> +	.busy		= scsi_mq_lld_busy,
> +	.map_queues	= scsi_map_queues,
> +};
> +
> +static void scsi_commit_rqs(struct blk_mq_hw_ctx *hctx)
> +{
> +	struct request_queue *q = hctx->queue;
> +	struct scsi_device *sdev = q->queuedata;
> +	struct Scsi_Host *shost = sdev->host;
> +
> +	shost->hostt->commit_rqs(shost, hctx->queue_num);
> +}
> +
>   static const struct blk_mq_ops scsi_mq_ops = {
>   	.get_budget	= scsi_mq_get_budget,
>   	.put_budget	= scsi_mq_put_budget,
>   	.queue_rq	= scsi_queue_rq,
> +	.commit_rqs	= scsi_commit_rqs,
>   	.complete	= scsi_softirq_done,
>   	.timeout	= scsi_timeout,
>   #ifdef CONFIG_BLK_DEBUG_FS

Hi Paolo,

Have you considered to modify the block layer such that a single 
scsi_mq_ops structure can be used for all SCSI LLD types?

Thanks,

Bart.