[NET]: Treat CHECKSUM_PARTIAL as CHECKSUM_UNNECESSARY

When a transmitted packet is looped back directly, CHECKSUM_PARTIAL
maps to the semantics of CHECKSUM_UNNECESSARY.  Therefore we should
treat it as such in the stack.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 3 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 9c3b4c7a50ad..d1604f59d77e 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4009,7 +4009,7 @@ static int tcp_copy_to_iovec(struct sock *sk, struct sk_buff *skb, int hlen)
         int err;
 
         local_bh_enable();
-        if (skb->ip_summed==CHECKSUM_UNNECESSARY)
+        if (skb_csum_unnecessary(skb))
                 err = skb_copy_datagram_iovec(skb, hlen, tp->ucopy.iov, chunk);
         else
                 err = skb_copy_and_csum_datagram_iovec(skb, hlen,
@@ -4041,7 +4041,7 @@ static __sum16 __tcp_checksum_complete_user(struct sock *sk, struct sk_buff *skb
 
 static inline int tcp_checksum_complete_user(struct sock *sk, struct sk_buff *skb)
 {
-        return skb->ip_summed != CHECKSUM_UNNECESSARY &&
+        return !skb_csum_unnecessary(skb) &&
                 __tcp_checksum_complete_user(sk, skb);
 }
 
@@ -4059,7 +4059,7 @@ static int tcp_dma_try_early_copy(struct sock *sk, struct sk_buff *skb, int hlen
         if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
                 tp->ucopy.dma_chan = get_softnet_dma();
 
-        if (tp->ucopy.dma_chan && skb->ip_summed == CHECKSUM_UNNECESSARY) {
+        if (tp->ucopy.dma_chan && skb_csum_unnecessary(skb)) {
 
                 dma_cookie = dma_skb_copy_datagram_iovec(tp->ucopy.dma_chan,
                         skb, hlen, tp->ucopy.iov, chunk, tp->ucopy.pinned_list);