[PATCH] virtio-blk: allow more than one in-flight request

[Marcelo Tosatti <marcelo@kvack.org>]

Allow more than one in-flight request in the virtio ring. This allows
the host driver to submit requests in parallel.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>


diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 3b1a68d..5bb041f 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -30,6 +30,8 @@ struct virtio_blk
 	struct scatterlist sg[VIRTIO_MAX_SG];
 };
 
+#define VIRTIO_BLK_POOL_SIZE 32
+
 struct virtblk_req
 {
 	struct list_head list;
@@ -202,7 +204,8 @@ static int virtblk_probe(struct virtio_device *vdev)
 		goto out_free_vblk;
 	}
 
-	vblk->pool = mempool_create_kmalloc_pool(1,sizeof(struct virtblk_req));
+	vblk->pool = mempool_create_kmalloc_pool(VIRTIO_BLK_POOL_SIZE,
+                        sizeof(struct virtblk_req));
 	if (!vblk->pool) {
 		err = -ENOMEM;
 		goto out_free_vq;

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