netdev - Re: [PATCH net-next 1/4] net: skbuff: add skb_append

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Date:	Wed, 20 May 2015 10:51:22 -0700
From:	Cong Wang <cwang@...pensource.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 1/4] net: skbuff: add skb_append_pagefrags and
 use it

On Wed, May 20, 2015 at 8:35 AM, Hannes Frederic Sowa
<hannes@...essinduktion.org> wrote:
> +int skb_append_pagefrags(struct sk_buff *skb, struct page *page,
> +                        int offset, size_t size)
> +{
> +       int i = skb_shinfo(skb)->nr_frags;
> +
> +       if (skb_can_coalesce(skb, i, page, offset)) {
> +               skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], size);
> +       } else if (i < MAX_SKB_FRAGS) {
> +               get_page(page);
> +               skb_fill_page_desc(skb, i, page, offset, size);
> +       } else {
> +               return -EMSGSIZE;
> +       }
> +
> +       return 0;
> +}
> +EXPORT_SYMBOL(skb_append_pagefrags);
> +
>  /**
>   *     skb_pull_rcsum - pull skb and update receive checksum
>   *     @skb: buffer to update
> diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
> index 8d91b92..35ff40f 100644
> --- a/net/ipv4/ip_output.c
> +++ b/net/ipv4/ip_output.c
> @@ -1292,12 +1292,8 @@ ssize_t  ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
>                 i = skb_shinfo(skb)->nr_frags;
>                 if (len > size)
>                         len = size;
> -               if (skb_can_coalesce(skb, i, page, offset)) {
> -                       skb_frag_size_add(&skb_shinfo(skb)->frags[i-1], len);
> -               } else if (i < MAX_SKB_FRAGS) {
> -                       get_page(page);
> -                       skb_fill_page_desc(skb, i, page, offset, len);
> -               } else {
> +
> +               if (skb_append_pagefrags(skb, page, offset, len)) {
>                         err = -EMSGSIZE;
>                         goto error;
>                 }

The 'i' can be removed now.
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