vxge: Implement 64bit stats

vxge_get_stats() is racy, since it clears a block of memory (net_stats)
possibly still used by other cpus.

We can update this driver to full 64bit stats, since ndo_get_stats64()
provides a private block to store results, and driver maintains 64bit
counters already.

We also remove net_stats field from struct vxge_sw_stats

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: Jon Mason <jon.mason@exar.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 7 insertions, 16 deletions

diff --git a/drivers/net/vxge/vxge-main.c b/drivers/net/vxge/vxge-main.c
index f5334b287fdb..01cdec712b64 100644
--- a/drivers/net/vxge/vxge-main.c
+++ b/drivers/net/vxge/vxge-main.c
@@ -2914,26 +2914,18 @@ static int vxge_change_mtu(struct net_device *dev, int new_mtu)
 }
 
 /**
- * vxge_get_stats
+ * vxge_get_stats64
  * @dev: pointer to the device structure
+ * @stats: pointer to struct rtnl_link_stats64
  *
- * Updates the device statistics structure. This function updates the device
- * statistics structure in the net_device structure and returns a pointer
- * to the same.
  */
-static struct net_device_stats *
-vxge_get_stats(struct net_device *dev)
+static struct rtnl_link_stats64 *
+vxge_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *net_stats)
 {
-        struct vxgedev *vdev;
-        struct net_device_stats *net_stats;
+        struct vxgedev *vdev = netdev_priv(dev);
         int k;
 
-        vdev = netdev_priv(dev);
-
-        net_stats = &vdev->stats.net_stats;
-
-        memset(net_stats, 0, sizeof(struct net_device_stats));
-
+        /* net_stats already zeroed by caller */
         for (k = 0; k < vdev->no_of_vpath; k++) {
                 net_stats->rx_packets += vdev->vpaths[k].ring.stats.rx_frms;
                 net_stats->rx_bytes += vdev->vpaths[k].ring.stats.rx_bytes;
@@ -3102,7 +3094,7 @@ vxge_vlan_rx_kill_vid(struct net_device *dev, unsigned short vid)
 static const struct net_device_ops vxge_netdev_ops = {
         .ndo_open               = vxge_open,
         .ndo_stop               = vxge_close,
-        .ndo_get_stats          = vxge_get_stats,
+        .ndo_get_stats64        = vxge_get_stats64,
         .ndo_start_xmit         = vxge_xmit,
         .ndo_validate_addr      = eth_validate_addr,
         .ndo_set_multicast_list = vxge_set_multicast,
diff --git a/drivers/net/vxge/vxge-main.h b/drivers/net/vxge/vxge-main.h
index 2e3b064b8e4b..d4be07eaacd7 100644
--- a/drivers/net/vxge/vxge-main.h
+++ b/drivers/net/vxge/vxge-main.h
@@ -172,7 +172,6 @@ struct vxge_msix_entry {
 
 struct vxge_sw_stats {
         /* Network Stats (interface stats) */
-        struct net_device_stats net_stats;
 
         /* Tx */
         u64 tx_frms;