gianfar: convert u64 status counters to atomic64_t

While looking at some asm dump for an unrelated change, Eric
noticed in the following stats count increment code:

    50b8:       81 3c 01 f8     lwz     r9,504(r28)
    50bc:       81 5c 01 fc     lwz     r10,508(r28)
    50c0:       31 4a 00 01     addic   r10,r10,1
    50c4:       7d 29 01 94     addze   r9,r9
    50c8:       91 3c 01 f8     stw     r9,504(r28)
    50cc:       91 5c 01 fc     stw     r10,508(r28)

that a 64 bit counter was used on ppc-32 without sync
and hence the "ethtool -S" output was racy.

Here we convert all the values to use atomic64_t so that
the output will always be consistent.

Reported-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

3 files changed, 31 insertions, 30 deletions

diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
index ab32bd0be8ff..c82f67727f43 100644
--- a/drivers/net/ethernet/freescale/gianfar.c
+++ b/drivers/net/ethernet/freescale/gianfar.c
@@ -2648,7 +2648,7 @@ static inline void count_errors(unsigned short status, struct net_device *dev)
         if (status & RXBD_TRUNCATED) {
                 stats->rx_length_errors++;
 
-                estats->rx_trunc++;
+                atomic64_inc(&estats->rx_trunc);
 
                 return;
         }
@@ -2657,20 +2657,20 @@ static inline void count_errors(unsigned short status, struct net_device *dev)
                 stats->rx_length_errors++;
 
                 if (status & RXBD_LARGE)
-                        estats->rx_large++;
+                        atomic64_inc(&estats->rx_large);
                 else
-                        estats->rx_short++;
+                        atomic64_inc(&estats->rx_short);
         }
         if (status & RXBD_NONOCTET) {
                 stats->rx_frame_errors++;
-                estats->rx_nonoctet++;
+                atomic64_inc(&estats->rx_nonoctet);
         }
         if (status & RXBD_CRCERR) {
-                estats->rx_crcerr++;
+                atomic64_inc(&estats->rx_crcerr);
                 stats->rx_crc_errors++;
         }
         if (status & RXBD_OVERRUN) {
-                estats->rx_overrun++;
+                atomic64_inc(&estats->rx_overrun);
                 stats->rx_crc_errors++;
         }
 }
@@ -2744,7 +2744,7 @@ static int gfar_process_frame(struct net_device *dev, struct sk_buff *skb,
         ret = napi_gro_receive(napi, skb);
 
         if (GRO_DROP == ret)
-                priv->extra_stats.kernel_dropped++;
+                atomic64_inc(&priv->extra_stats.kernel_dropped);
 
         return 0;
 }
@@ -2812,7 +2812,7 @@ int gfar_clean_rx_ring(struct gfar_priv_rx_q *rx_queue, int rx_work_limit)
                         } else {
                                 netif_warn(priv, rx_err, dev, "Missing skb!\n");
                                 rx_queue->stats.rx_dropped++;
-                                priv->extra_stats.rx_skbmissing++;
+                                atomic64_inc(&priv->extra_stats.rx_skbmissing);
                         }
 
                 }
@@ -3245,7 +3245,7 @@ static irqreturn_t gfar_error(int irq, void *grp_id)
                         netif_dbg(priv, tx_err, dev,
                                   "TX FIFO underrun, packet dropped\n");
                         dev->stats.tx_dropped++;
-                        priv->extra_stats.tx_underrun++;
+                        atomic64_inc(&priv->extra_stats.tx_underrun);
 
                         local_irq_save(flags);
                         lock_tx_qs(priv);
@@ -3260,7 +3260,7 @@ static irqreturn_t gfar_error(int irq, void *grp_id)
         }
         if (events & IEVENT_BSY) {
                 dev->stats.rx_errors++;
-                priv->extra_stats.rx_bsy++;
+                atomic64_inc(&priv->extra_stats.rx_bsy);
 
                 gfar_receive(irq, grp_id);
 
@@ -3269,19 +3269,19 @@ static irqreturn_t gfar_error(int irq, void *grp_id)
         }
         if (events & IEVENT_BABR) {
                 dev->stats.rx_errors++;
-                priv->extra_stats.rx_babr++;
+                atomic64_inc(&priv->extra_stats.rx_babr);
 
                 netif_dbg(priv, rx_err, dev, "babbling RX error\n");
         }
         if (events & IEVENT_EBERR) {
-                priv->extra_stats.eberr++;
+                atomic64_inc(&priv->extra_stats.eberr);
                 netif_dbg(priv, rx_err, dev, "bus error\n");
         }
         if (events & IEVENT_RXC)
                 netif_dbg(priv, rx_status, dev, "control frame\n");
 
         if (events & IEVENT_BABT) {
-                priv->extra_stats.tx_babt++;
+                atomic64_inc(&priv->extra_stats.tx_babt);
                 netif_dbg(priv, tx_err, dev, "babbling TX error\n");
         }
         return IRQ_HANDLED;
diff --git a/drivers/net/ethernet/freescale/gianfar.h b/drivers/net/ethernet/freescale/gianfar.h
index 61b1785c9ca7..78125f1f870e 100644
--- a/drivers/net/ethernet/freescale/gianfar.h
+++ b/drivers/net/ethernet/freescale/gianfar.h
@@ -627,24 +627,25 @@ struct rmon_mib
 };
 
 struct gfar_extra_stats {
-        u64 kernel_dropped;
-        u64 rx_large;
-        u64 rx_short;
-        u64 rx_nonoctet;
-        u64 rx_crcerr;
-        u64 rx_overrun;
-        u64 rx_bsy;
-        u64 rx_babr;
-        u64 rx_trunc;
-        u64 eberr;
-        u64 tx_babt;
-        u64 tx_underrun;
-        u64 rx_skbmissing;
-        u64 tx_timeout;
+        atomic64_t kernel_dropped;
+        atomic64_t rx_large;
+        atomic64_t rx_short;
+        atomic64_t rx_nonoctet;
+        atomic64_t rx_crcerr;
+        atomic64_t rx_overrun;
+        atomic64_t rx_bsy;
+        atomic64_t rx_babr;
+        atomic64_t rx_trunc;
+        atomic64_t eberr;
+        atomic64_t tx_babt;
+        atomic64_t tx_underrun;
+        atomic64_t rx_skbmissing;
+        atomic64_t tx_timeout;
 };
 
 #define GFAR_RMON_LEN ((sizeof(struct rmon_mib) - 16)/sizeof(u32))
-#define GFAR_EXTRA_STATS_LEN (sizeof(struct gfar_extra_stats)/sizeof(u64))
+#define GFAR_EXTRA_STATS_LEN \
+        (sizeof(struct gfar_extra_stats)/sizeof(atomic64_t))
 
 /* Number of stats exported via ethtool */
 #define GFAR_STATS_LEN (GFAR_RMON_LEN + GFAR_EXTRA_STATS_LEN)
diff --git a/drivers/net/ethernet/freescale/gianfar_ethtool.c b/drivers/net/ethernet/freescale/gianfar_ethtool.c
index 172acb923bfb..75e89acf4912 100644
--- a/drivers/net/ethernet/freescale/gianfar_ethtool.c
+++ b/drivers/net/ethernet/freescale/gianfar_ethtool.c
@@ -149,10 +149,10 @@ static void gfar_fill_stats(struct net_device *dev, struct ethtool_stats *dummy,
         int i;
         struct gfar_private *priv = netdev_priv(dev);
         struct gfar __iomem *regs = priv->gfargrp[0].regs;
-        u64 *extra = (u64 *) & priv->extra_stats;
+        atomic64_t *extra = (atomic64_t *)&priv->extra_stats;
 
         for (i = 0; i < GFAR_EXTRA_STATS_LEN; i++)
-                buf[i] = extra[i];
+                buf[i] = atomic64_read(&extra[i]);
 
         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_RMON) {
                 u32 __iomem *rmon = (u32 __iomem *) &regs->rmon;