net: qualcomm: rmnet: use ip_is_fragment()

In rmnet_map_ipv4_dl_csum_trailer() use ip_is_fragment() to
determine whether a socket buffer contains a packet fragment.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
index cecf72b..34bd1a9 100644 (file)
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c
@@ -50,8 +50,9 @@ rmnet_map_ipv4_dl_csum_trailer(struct sk_buff *skb,
        __be16 addend;
 
        ip4h = (struct iphdr *)(skb->data);
-       if ((ntohs(ip4h->frag_off) & IP_MF) ||
-           ((ntohs(ip4h->frag_off) & IP_OFFSET) > 0)) {
+
+       /* We don't support checksum offload on IPv4 fragments */
+       if (ip_is_fragment(ip4h)) {
                priv->stats.csum_fragmented_pkt++;
                return -EOPNOTSUPP;
        }