forcedeth: account for dropped RX frames

This adds code to update the stats counter for dropped RX frames.

Signed-off-by: David Decotigny <david.decotigny@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/nvidia/forcedeth.c b/drivers/net/ethernet/nvidia/forcedeth.c
index 5d94c33..b34975d 100644 (file)
--- a/drivers/net/ethernet/nvidia/forcedeth.c
+++ b/drivers/net/ethernet/nvidia/forcedeth.c
@@ -815,6 +815,7 @@ struct fe_priv {
        u64 stat_rx_packets;
        u64 stat_rx_bytes; /* not always available in HW */
        u64 stat_rx_missed_errors;
+       u64 stat_rx_dropped;
 
        /* media detection workaround.
         * Locking: Within irq hander or disable_irq+spin_lock(&np->lock);
@@ -1758,6 +1759,7 @@ nv_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *storage)
                syncp_start = u64_stats_fetch_begin(&np->swstats_rx_syncp);
                storage->rx_packets       = np->stat_rx_packets;
                storage->rx_bytes         = np->stat_rx_bytes;
+               storage->rx_dropped       = np->stat_rx_dropped;
                storage->rx_missed_errors = np->stat_rx_missed_errors;
        } while (u64_stats_fetch_retry(&np->swstats_rx_syncp, syncp_start));
 
@@ -1828,8 +1830,12 @@ static int nv_alloc_rx(struct net_device *dev)
                                np->put_rx.orig = np->first_rx.orig;
                        if (unlikely(np->put_rx_ctx++ == np->last_rx_ctx))
                                np->put_rx_ctx = np->first_rx_ctx;
-               } else
+               } else {
+                       u64_stats_update_begin(&np->swstats_rx_syncp);
+                       np->stat_rx_dropped++;
+                       u64_stats_update_end(&np->swstats_rx_syncp);
                        return 1;
+               }
        }
        return 0;
 }
@@ -1860,8 +1866,12 @@ static int nv_alloc_rx_optimized(struct net_device *dev)
                                np->put_rx.ex = np->first_rx.ex;
                        if (unlikely(np->put_rx_ctx++ == np->last_rx_ctx))
                                np->put_rx_ctx = np->first_rx_ctx;
-               } else
+               } else {
+                       u64_stats_update_begin(&np->swstats_rx_syncp);
+                       np->stat_rx_dropped++;
+                       u64_stats_update_end(&np->swstats_rx_syncp);
                        return 1;
+               }
        }
        return 0;
 }