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>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index fb98d4602f9d..16430a8440fa 100644
--- 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;