linux-kernel - Re: [Xen-devel] [PATCH v3 0/2] block/xen-blkfront: Support non-indirect grant with 64KB page granularity

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Date:	Tue, 8 Dec 2015 12:25:13 +0000
From:	Julien Grall <julien.grall@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	<xen-devel@...ts.xenproject.org>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Roger Pau Monné <roger.pau@...rix.com>,
	<linux-kernel@...r.kernel.org>,
	David Vrabel <david.vrabel@...rix.com>
Subject: Re: [Xen-devel] [PATCH v3 0/2] block/xen-blkfront: Support non-indirect
 grant with 64KB page granularity

Hi Konrad,

The rebase of my patch is not correct. It now contains an unused variable and
missing one change.

I will post the rebase of the two patches.

On 01/12/15 18:52, Konrad Rzeszutek Wilk wrote:
> +static unsigned long blkif_ring_get_request(struct blkfront_ring_info *rinfo,
> +					    struct request *req,
> +					    struct blkif_request **ring_req)
> +{
> +	unsigned long id;
> +	struct blkfront_info *info = rinfo->dev_info;

This variable is unused within the function.

> +
> +	*ring_req = RING_GET_REQUEST(&rinfo->ring, rinfo->ring.req_prod_pvt);
> +	rinfo->ring.req_prod_pvt++;
> +
> +	id = get_id_from_freelist(rinfo);
> +	rinfo->shadow[id].request = req;
> +
> +	(*ring_req)->u.rw.id = id;
> +
> +	return id;
> +}
> +
>  static int blkif_queue_discard_req(struct request *req, struct blkfront_ring_info *rinfo)
>  {
>  	struct blkfront_info *info = rinfo->dev_info;
> @@ -488,9 +506,7 @@ static int blkif_queue_discard_req(struct request *req, struct blkfront_ring_inf
>  	unsigned long id;
>  
>  	/* Fill out a communications ring structure. */
> -	ring_req = RING_GET_REQUEST(&rinfo->ring, rinfo->ring.req_prod_pvt);
> -	id = get_id_from_freelist(rinfo);
> -	rinfo->shadow[id].request = req;
> +	id = blkif_ring_get_request(rinfo, req, &ring_req);
>  
>  	ring_req->operation = BLKIF_OP_DISCARD;
>  	ring_req->u.discard.nr_sectors = blk_rq_sectors(req);
> @@ -501,8 +517,6 @@ static int blkif_queue_discard_req(struct request *req, struct blkfront_ring_inf
>  	else
>  		ring_req->u.discard.flag = 0;
>  
> -	rinfo->ring.req_prod_pvt++;
> -
>  	/* Keep a private copy so we can reissue requests when recovering. */
>  	rinfo->shadow[id].req = *ring_req;
>  
> @@ -635,9 +649,7 @@ static int blkif_queue_rw_req(struct request *req, struct blkfront_ring_info *ri
>  		}
>  
>  	/* Fill out a communications ring structure. */
> -	ring_req = RING_GET_REQUEST(&rinfo->ring, rinfo->ring.req_prod_pvt);
> -	id = get_id_from_freelist(rinfo);
> -	rinfo->shadow[id].request = req;
> +	id = blkif_ring_get_request(rinfo, req, &ring_req);
>  
>  	BUG_ON(info->max_indirect_segments == 0 &&
>  	       GREFS(req->nr_phys_segments) > BLKIF_MAX_SEGMENTS_PER_REQUEST);

@@ -650,7 +661,6 @@ static int blkif_queue_rw_req(struct request *req, struct blkfront_ring_info *ri
        for_each_sg(rinfo->shadow[id].sg, sg, num_sg, i)
               num_grant += gnttab_count_grant(sg->offset, sg->length);
 
-       ring_req->u.rw.id = id;
        rinfo->shadow[id].num_sg = num_sg;
        if (num_grant > BLKIF_MAX_SEGMENTS_PER_REQUEST) {
                /*

> @@ -716,8 +728,6 @@ static int blkif_queue_rw_req(struct request *req, struct blkfront_ring_info *ri
>  	if (setup.segments)
>  		kunmap_atomic(setup.segments);
>  
> -	rinfo->ring.req_prod_pvt++;
> -
>  	/* Keep a private copy so we can reissue requests when recovering. */
>  	rinfo->shadow[id].req = *ring_req;

Regards,

-- 
Julien Grall
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