igb: Remove invalid stats counters

There are several counters being used like they are static when in fact
they are clear on read.  In order to prevent the values from being
incorrect I am removing the defunct counters.
Signed-off-by: NAlexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/igb/igb.h

@@ -269,10 +269,6 @@ struct igb_adapter {
 	/* TX */
 	struct igb_ring *tx_ring;      /* One per active queue */
 	unsigned long tx_queue_len;
-	u32 gotc;
-	u64 gotc_old;
-	u64 tpt_old;
-	u64 colc_old;
 	u32 tx_timeout_count;
 
 	/* RX */
@@ -280,8 +276,6 @@ struct igb_adapter {
 	int num_tx_queues;
 	int num_rx_queues;
 
-	u32 gorc;
-	u64 gorc_old;
 	u32 max_frame_size;
 	u32 min_frame_size;
 

drivers/net/igb/igb_main.c

@@ -2925,9 +2925,6 @@ static void igb_watchdog_task(struct work_struct *work)
 	int i;
 
 	link = igb_has_link(adapter);
-	if ((netif_carrier_ok(netdev)) && link)
-		goto link_up;
-
 	if (link) {
 		if (!netif_carrier_ok(netdev)) {
 			u32 ctrl;
@@ -2990,20 +2987,8 @@ static void igb_watchdog_task(struct work_struct *work)
 		}
 	}
 
-link_up:
 	igb_update_stats(adapter);
-
-	hw->mac.tx_packet_delta = adapter->stats.tpt - adapter->tpt_old;
-	adapter->tpt_old = adapter->stats.tpt;
-	hw->mac.collision_delta = adapter->stats.colc - adapter->colc_old;
-	adapter->colc_old = adapter->stats.colc;
-
-	adapter->gorc = adapter->stats.gorc - adapter->gorc_old;
-	adapter->gorc_old = adapter->stats.gorc;
-	adapter->gotc = adapter->stats.gotc - adapter->gotc_old;
-	adapter->gotc_old = adapter->stats.gotc;
-
-	igb_update_adaptive(&adapter->hw);
+	igb_update_adaptive(hw);
 
 	if (!netif_carrier_ok(netdev)) {
 		if (igb_desc_unused(tx_ring) + 1 < tx_ring->count) {
@@ -3875,7 +3860,6 @@ void igb_update_stats(struct igb_adapter *adapter)
 	adapter->stats.bptc += rd32(E1000_BPTC);
 
 	/* used for adaptive IFS */
-
 	hw->mac.tx_packet_delta = rd32(E1000_TPT);
 	adapter->stats.tpt += hw->mac.tx_packet_delta;
 	hw->mac.collision_delta = rd32(E1000_COLC);