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

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Message-ID: <57747AEC.8050307@redhat.com>
Date:	Thu, 30 Jun 2016 09:50:36 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	"Michael S. Tsirkin" <mst@...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 2016年06月28日 15:09, Michael S. Tsirkin wrote:
> 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);
>   }

Will split up the above tweak into another patch when reposting.

>   
> +static inline int skb_raay_resize_multiple(struct skb_array **rings, int nrings,

I think you mean 'skb_array_resize' here.

> +					   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);

This should be return ptr_ring_resize_multiple(...

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

With this, looks like there's no need for a new flag. Will repost the 
series with those two patches.

Thanks