On Thu, Oct 31, 2013 at 06:28:32PM +0800, Jason Wang wrote:
> Sometimes we need to coalesce the rx frags to avoid frag list. One example is
> virtio-net driver which tries to use small frags for both MTU sized packet and
> GSO packet. So this patch introduce skb_coalesce_rx_frag() to do this.
>
> Cc: Rusty Russell <ru...@rustcorp.com.au>
> Cc: Michael S. Tsirkin <m...@redhat.com>
> Cc: Michael Dalton <mwdal...@google.com>
> Cc: Eric Dumazet <eduma...@google.com>
> Signed-off-by: Jason Wang <jasow...@redhat.com>
Acked-by: Michael S. Tsirkin <m...@redhat.com>
> ---
> include/linux/skbuff.h | 3 +++
> net/core/skbuff.c | 13 +++++++++++++
> 2 files changed, 16 insertions(+)
>
> diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> index 2c15497..e34652b 100644
> --- a/include/linux/skbuff.h
> +++ b/include/linux/skbuff.h
> @@ -1372,6 +1372,9 @@ static inline void skb_fill_page_desc(struct sk_buff
> *skb, int i,
> void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off,
> int size, unsigned int truesize);
>
> +void skb_coalesce_rx_frag(struct sk_buff *skb, int i, int off, int size,
> + unsigned int truesize);
> +
> #define SKB_PAGE_ASSERT(skb) BUG_ON(skb_shinfo(skb)->nr_frags)
> #define SKB_FRAG_ASSERT(skb) BUG_ON(skb_has_frag_list(skb))
> #define SKB_LINEAR_ASSERT(skb) BUG_ON(skb_is_nonlinear(skb))
> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> index 0ab32fa..fdef994 100644
> --- a/net/core/skbuff.c
> +++ b/net/core/skbuff.c
> @@ -476,6 +476,19 @@ void skb_add_rx_frag(struct sk_buff *skb, int i, struct
> page *page, int off,
> }
> EXPORT_SYMBOL(skb_add_rx_frag);
>
> +void skb_coalesce_rx_frag(struct sk_buff *skb, int i, int off, int size,
> + unsigned int truesize)
> +{
> + skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
> +
> + skb_frag_size_add(frag, size);
> + skb->len += size;
> + skb->data_len += size;
> + skb->truesize += truesize;
> + skb_frag_unref(skb, i);
> +}
> +EXPORT_SYMBOL(skb_coalesce_rx_frag);
> +
> static void skb_drop_list(struct sk_buff **listp)
> {
> kfree_skb_list(*listp);
> --
> 1.8.1.2
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