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Commit be12a1fe authored by Hannes Frederic Sowa's avatar Hannes Frederic Sowa Committed by David S. Miller
Browse files

net: skbuff: add skb_append_pagefrags and use it 



Signed-off-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d98c3edc

include/linux/skbuff.h

+3 −0
Original line number Diff line number Diff line
@@ -861,6 +861,9 @@ int skb_append_datato_frags(struct sock *sk, struct sk_buff *skb, 
					int len, int odd, struct sk_buff *skb),

			    void *from, int length);



int skb_append_pagefrags(struct sk_buff *skb, struct page *page,

			 int offset, size_t size);



struct skb_seq_state {

	__u32		lower_offset;

	__u32		upper_offset;

net/core/skbuff.c

+18 −0
Original line number Diff line number Diff line
@@ -2915,6 +2915,24 @@ int skb_append_datato_frags(struct sock *sk, struct sk_buff *skb, 
}

EXPORT_SYMBOL(skb_append_datato_frags);



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_GPL(skb_append_pagefrags);



/**

 *	skb_pull_rcsum - pull skb and update receive checksum

 *	@skb: buffer to update

net/ipv4/ip_output.c

+4 −11
Original line number Diff line number Diff line
@@ -1233,11 +1233,9 @@ ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, 
	}



	while (size > 0) {

		int i;



		if (skb_is_gso(skb))

		if (skb_is_gso(skb)) {

			len = size;

		else {

		} else {



			/* Check if the remaining data fits into current packet. */

			len = mtu - skb->len;
@@ -1289,15 +1287,10 @@ ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, 
			continue;

		}



		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;

		}