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

[Julien Grall <julien.grall@xxxxxxxxxx>]

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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