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Commit 32dce968 authored by Vlad Yasevich's avatar Vlad Yasevich Committed by David S. Miller
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ipv6: Allow for partial checksums on non-ufo packets 



Currntly, if we are not doing UFO on the packet, all UDP
packets will start with CHECKSUM_NONE and thus perform full
checksum computations in software even if device support
IPv6 checksum offloading.

Let's start start with CHECKSUM_PARTIAL if the device
supports it and we are sending only a single packet at
or below mtu size.

Signed-off-by: default avatarVladislav Yasevich <vyasevic@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 03485f2a

net/ipv6/ip6_output.c

+10 −1
Original line number Diff line number Diff line
@@ -1227,6 +1227,7 @@ static int __ip6_append_data(struct sock *sk, 
	u32 tskey = 0;

	struct rt6_info *rt = (struct rt6_info *)cork->dst;

	struct ipv6_txoptions *opt = v6_cork->opt;

	int csummode = CHECKSUM_NONE;



	skb = skb_peek_tail(queue);

	if (!skb) {
@@ -1283,6 +1284,14 @@ static int __ip6_append_data(struct sock *sk, 
			tskey = sk->sk_tskey++;

	}



	/* If this is the first and only packet and device

	 * supports checksum offloading, let's use it.

	 */

	if (!skb &&

	    length + fragheaderlen < mtu &&

	    rt->dst.dev->features & NETIF_F_V6_CSUM &&

	    !exthdrlen)

		csummode = CHECKSUM_PARTIAL;

	/*

	 * Let's try using as much space as possible.

	 * Use MTU if total length of the message fits into the MTU.
@@ -1395,7 +1404,7 @@ static int __ip6_append_data(struct sock *sk, 
			 *	Fill in the control structures

			 */

			skb->protocol = htons(ETH_P_IPV6);

			skb->ip_summed = CHECKSUM_NONE;

			skb->ip_summed = csummode;

			skb->csum = 0;

			/* reserve for fragmentation and ipsec header */

			skb_reserve(skb, hh_len + sizeof(struct frag_hdr) +