xfrm: use dev_sw_netstats_rx_add()

use new helper for netstats settings
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/xfrm/xfrm_interface.c

@@ -210,7 +210,6 @@ static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet)
 static int xfrmi_rcv_cb(struct sk_buff *skb, int err)
 {
 	const struct xfrm_mode *inner_mode;
-	struct pcpu_sw_netstats *tstats;
 	struct net_device *dev;
 	struct xfrm_state *x;
 	struct xfrm_if *xi;
@@ -255,13 +254,7 @@ static int xfrmi_rcv_cb(struct sk_buff *skb, int err)
 	}
 
 	xfrmi_scrub_packet(skb, xnet);
-
-	tstats = this_cpu_ptr(dev->tstats);
-
-	u64_stats_update_begin(&tstats->syncp);
-	tstats->rx_packets++;
-	tstats->rx_bytes += skb->len;
-	u64_stats_update_end(&tstats->syncp);
+	dev_sw_netstats_rx_add(dev, skb->len);
 
 	return 0;
 }