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: Vladislav Yasevich <vyasevic@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -1227,6 +1227,7 @@ static int __ip6_append_data(struct sock *sk,
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u32 tskey = 0;
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struct rt6_info *rt = (struct rt6_info *)cork->dst;
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struct ipv6_txoptions *opt = v6_cork->opt;
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int csummode = CHECKSUM_NONE;
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skb = skb_peek_tail(queue);
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if (!skb) {
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@ -1283,6 +1284,14 @@ emsgsize:
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tskey = sk->sk_tskey++;
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}
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/* If this is the first and only packet and device
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* supports checksum offloading, let's use it.
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*/
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if (!skb &&
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length + fragheaderlen < mtu &&
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rt->dst.dev->features & NETIF_F_V6_CSUM &&
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!exthdrlen)
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csummode = CHECKSUM_PARTIAL;
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/*
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* Let's try using as much space as possible.
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* Use MTU if total length of the message fits into the MTU.
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@ -1395,7 +1404,7 @@ alloc_new_skb:
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* Fill in the control structures
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*/
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skb->protocol = htons(ETH_P_IPV6);
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skb->ip_summed = CHECKSUM_NONE;
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skb->ip_summed = csummode;
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skb->csum = 0;
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/* reserve for fragmentation and ipsec header */
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skb_reserve(skb, hh_len + sizeof(struct frag_hdr) +
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