staging: octeon: drop atomic usage from rx counters

We have only one NAPI poll running at a time, so virtual port rx counters
can be updated normally.

Update of rx_dropped can still race with the gathering of statistics,
but full accuracy is not required there.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Acked-by: David Daney <david.daney@cavium.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/octeon/ethernet-rx.c

@@ -26,8 +26,6 @@
 #include <net/xfrm.h>
 #endif /* CONFIG_XFRM */
 
-#include <linux/atomic.h>
-
 #include <asm/octeon/octeon.h>
 
 #include "ethernet-defines.h"
@@ -364,17 +362,8 @@ static int cvm_oct_napi_poll(struct napi_struct *napi, int budget)
 
 				/* Increment RX stats for virtual ports */
 				if (port >= CVMX_PIP_NUM_INPUT_PORTS) {
-#ifdef CONFIG_64BIT
-					atomic64_add(1,
-						     (atomic64_t *)&priv->stats.rx_packets);
-					atomic64_add(skb->len,
-						     (atomic64_t *)&priv->stats.rx_bytes);
-#else
-					atomic_add(1,
-						   (atomic_t *)&priv->stats.rx_packets);
-					atomic_add(skb->len,
-						   (atomic_t *)&priv->stats.rx_bytes);
-#endif
+					priv->stats.rx_packets++;
+					priv->stats.rx_bytes += skb->len;
 				}
 				netif_receive_skb(skb);
 			} else {
@@ -383,13 +372,7 @@ static int cvm_oct_napi_poll(struct napi_struct *napi, int budget)
 				  printk_ratelimited("%s: Device not up, packet dropped\n",
 					   dev->name);
 				*/
-#ifdef CONFIG_64BIT
-				atomic64_add(1,
-					     (atomic64_t *)&priv->stats.rx_dropped);
-#else
-				atomic_add(1,
-					   (atomic_t *)&priv->stats.rx_dropped);
-#endif
+				priv->stats.rx_dropped++;
 				dev_kfree_skb_irq(skb);
 			}
 		} else {

drivers/staging/octeon/ethernet.c

@@ -226,18 +226,7 @@ static struct net_device_stats *cvm_oct_common_get_stats(struct net_device *dev)
 		priv->stats.multicast += rx_status.multicast_packets;
 		priv->stats.rx_crc_errors += rx_status.inb_errors;
 		priv->stats.rx_frame_errors += rx_status.fcs_align_err_packets;
-
-		/*
-		 * The drop counter must be incremented atomically
-		 * since the RX tasklet also increments it.
-		 */
-#ifdef CONFIG_64BIT
-		atomic64_add(rx_status.dropped_packets,
-			     (atomic64_t *)&priv->stats.rx_dropped);
-#else
-		atomic_add(rx_status.dropped_packets,
-			     (atomic_t *)&priv->stats.rx_dropped);
-#endif
+		priv->stats.rx_dropped += rx_status.dropped_packets;
 	}
 
 	return &priv->stats;