Commit 2b89ed65 authored Jan 29, 2017 by Vlad Yasevich Committed by David S. Miller Jan 30, 2017

ipv6: Paritially checksum full MTU frames



IPv6 will mark data that is smaller that mtu - headersize as
CHECKSUM_PARTIAL, but if the data will completely fill the mtu,
the packet checksum will be computed in software instead.
Extend the conditional to include the data that fills the mtu
as well.

Signed-off-by: Vladislav Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent d585df1c

net/ipv6/ip6_output.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1344,7 +1344,7 @@ static int __ip6_append_data(struct sock *sk,
		*/
		if (transhdrlen && sk->sk_protocol == IPPROTO_UDP &&
		headersize == sizeof(struct ipv6hdr) &&
		length < mtu - headersize &&
		length <= mtu - headersize &&
		!(flags & MSG_MORE) &&
		rt->dst.dev->features & (NETIF_F_IPV6_CSUM \| NETIF_F_HW_CSUM))
		csummode = CHECKSUM_PARTIAL;