Re: [PATCH net-next V2] tun: introduce tx skb ring

On Thu, Jun 23, 2016 at 01:14:07PM +0800, Jason Wang wrote:

quoted

On 2016年06月23日 02:18, Michael S. Tsirkin wrote:

quoted

On Fri, Jun 17, 2016 at 03:41:20AM +0300, Michael S. Tsirkin wrote:

quoted

quoted

Would it help to have ptr_ring_resize that gets an array of
rings and resizes them both to same length?

OK, here it is. Untested so far, and no skb wrapper.
Pls let me know whether this is what you had in mind.

Exactly what I want.

Thanks

Ok and this for skb_array

-->
skb_array: add wrappers for resizing

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

--

diff --git a/include/linux/skb_array.h b/include/linux/skb_array.h
index c900708..7e01c1f 100644
--- a/include/linux/skb_array.h
+++ b/include/linux/skb_array.h

@@ -151,16 +151,24 @@ static inline int skb_array_init(struct skb_array *a, int size, gfp_t gfp)
  	return ptr_ring_init(&a->ring, size, 0, gfp);
  }
  
-void __skb_array_destroy_skb(void *ptr)
+static void __skb_array_destroy_skb(void *ptr)
  {
  	kfree_skb(ptr);
  }
  
-int skb_array_resize(struct skb_array *a, int size, gfp_t gfp)
+static inline int skb_array_resize(struct skb_array *a, int size, gfp_t gfp)
  {
  	return ptr_ring_resize(&a->ring, size, gfp, __skb_array_destroy_skb);
  }

+					   int size, gfp_t gfp)
+{
+	BUILD_BUG_ON(offsetof(struct skb_array, ring));
+	ptr_ring_resize_multiple((struct ptr_ring **)rings, nrings, size, gfp,
+				 __skb_array_destroy_skb);

+}
+
  static inline void skb_array_cleanup(struct skb_array *a)
  {
  	ptr_ring_cleanup(&a->ring, __skb_array_destroy_skb);