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

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Message-ID: <20160628100907-mutt-send-email-mst@redhat.com>
Date:	Tue, 28 Jun 2016 10:09:42 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Jason Wang <jasowang@...hat.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
	davem@...emloft.net, eric.dumazet@...il.com, brouer@...hat.com
Subject: Re: [PATCH net-next V2] tun: introduce tx skb ring

On Thu, Jun 23, 2016 at 01:14:07PM +0800, Jason Wang wrote:
> 
> 
> On 2016年06月23日 02:18, Michael S. Tsirkin wrote:
> > On Fri, Jun 17, 2016 at 03:41:20AM +0300, Michael S. Tsirkin wrote:
> > > >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@...hat.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);
 }
 
+static inline int skb_raay_resize_multiple(struct skb_array **rings, int nrings,
+					   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);