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>

diff --git a/drivers/staging/octeon/ethernet-rx.c b/drivers/staging/octeon/ethernet-rx.c
index 6aed3cf..ed55304 100644 (file)
--- a/drivers/staging/octeon/ethernet-rx.c
+++ b/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 {

diff --git a/drivers/staging/octeon/ethernet.c b/drivers/staging/octeon/ethernet.c
index 8d239e2..9fa552f 100644 (file)
--- a/drivers/staging/octeon/ethernet.c
+++ b/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;