igb: fix stats for i210 rx_fifo_errors

RQDPC on i210/i211 is R/W not ReadClear. Clear after reading.

Signed-off-by: Todd Fujinaka <todd.fujinaka@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index fb98d4602f9d4fd130b660de0265bee786fec7a6..16430a8440fa3c5bcc299427f3052f6f2a7bdfcc 100644 (file)
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -5193,8 +5193,10 @@ void igb_update_stats(struct igb_adapter *adapter,
 
        rcu_read_lock();
        for (i = 0; i < adapter->num_rx_queues; i++) {
-               u32 rqdpc = rd32(E1000_RQDPC(i));
                struct igb_ring *ring = adapter->rx_ring[i];
+               u32 rqdpc = rd32(E1000_RQDPC(i));
+               if (hw->mac.type >= e1000_i210)
+                       wr32(E1000_RQDPC(i), 0);
 
                if (rqdpc) {
                        ring->rx_stats.drops += rqdpc;