igb: count Rx FIFO errors correctly

Don't aggregate rx_no_buffer_count into rx_fifo_errors. RNBC counts
packets that get queued temporarily in the adapter's FIFO. These
packets are not dropped and are not errors. The correct counter
is rx_missed_errors (MPC).

Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 5 deletions

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 45a0e4fd5871..70dc03bb9cb2 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -3963,7 +3963,7 @@ void igb_update_stats(struct igb_adapter *adapter)
         struct net_device_stats *net_stats = igb_get_stats(adapter->netdev);
         struct e1000_hw *hw = &adapter->hw;
         struct pci_dev *pdev = adapter->pdev;
-        u32 rnbc, reg;
+        u32 reg, mpc;
         u16 phy_tmp;
         int i;
         u64 bytes, packets;
@@ -4021,7 +4021,9 @@ void igb_update_stats(struct igb_adapter *adapter)
         adapter->stats.symerrs += rd32(E1000_SYMERRS);
         adapter->stats.sec += rd32(E1000_SEC);
 
-        adapter->stats.mpc += rd32(E1000_MPC);
+        mpc = rd32(E1000_MPC);
+        adapter->stats.mpc += mpc;
+        net_stats->rx_fifo_errors += mpc;
         adapter->stats.scc += rd32(E1000_SCC);
         adapter->stats.ecol += rd32(E1000_ECOL);
         adapter->stats.mcc += rd32(E1000_MCC);
@@ -4036,9 +4038,7 @@ void igb_update_stats(struct igb_adapter *adapter)
         adapter->stats.gptc += rd32(E1000_GPTC);
         adapter->stats.gotc += rd32(E1000_GOTCL);
         rd32(E1000_GOTCH); /* clear GOTCL */
-        rnbc = rd32(E1000_RNBC);
-        adapter->stats.rnbc += rnbc;
-        net_stats->rx_fifo_errors += rnbc;
+        adapter->stats.rnbc += rd32(E1000_RNBC);
         adapter->stats.ruc += rd32(E1000_RUC);
         adapter->stats.rfc += rd32(E1000_RFC);
         adapter->stats.rjc += rd32(E1000_RJC);