i40e: Tx/Rx rings declaration

This patch changes the declaration of Tx/Rx rings inside several loops. It
eliminates declaring the same rings every time for the duration of the loop,
instead declaring them once before the loop.

Change-ID: I59dea54276f18c47dca522f520c18f65fe42a15d
Signed-off-by: Akeem G Abodunrin <akeem.g.abodunrin@intel.com>
Tested-by: Kavindya Deegala <kavindya.s.deegala@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_ethtool.c

@@ -633,6 +633,7 @@ static void i40e_get_ethtool_stats(struct net_device *netdev,
 				   struct ethtool_stats *stats, u64 *data)
 {
 	struct i40e_netdev_priv *np = netdev_priv(netdev);
+	struct i40e_ring *tx_ring, *rx_ring;
 	struct i40e_vsi *vsi = np->vsi;
 	struct i40e_pf *pf = vsi->back;
 	int i = 0;
@@ -650,8 +651,7 @@ static void i40e_get_ethtool_stats(struct net_device *netdev,
 	}
 	rcu_read_lock();
 	for (j = 0; j < vsi->num_queue_pairs; j++) {
-		struct i40e_ring *tx_ring = ACCESS_ONCE(vsi->tx_rings[j]);
-		struct i40e_ring *rx_ring;
+		tx_ring = ACCESS_ONCE(vsi->tx_rings[j]);
 
 		if (!tx_ring)
 			continue;

drivers/net/ethernet/intel/i40e/i40e_main.c

@@ -356,6 +356,7 @@ static struct rtnl_link_stats64 *i40e_get_netdev_stats_struct(
 					     struct rtnl_link_stats64 *stats)
 {
 	struct i40e_netdev_priv *np = netdev_priv(netdev);
+	struct i40e_ring *tx_ring, *rx_ring;
 	struct i40e_vsi *vsi = np->vsi;
 	struct rtnl_link_stats64 *vsi_stats = i40e_get_vsi_stats_struct(vsi);
 	int i;
@@ -368,7 +369,6 @@ static struct rtnl_link_stats64 *i40e_get_netdev_stats_struct(
 
 	rcu_read_lock();
 	for (i = 0; i < vsi->num_queue_pairs; i++) {
-		struct i40e_ring *tx_ring, *rx_ring;
 		u64 bytes, packets;
 		unsigned int start;
 
@@ -2415,6 +2415,7 @@ static int i40e_vsi_configure_rx(struct i40e_vsi *vsi)
  **/
 static void i40e_vsi_config_dcb_rings(struct i40e_vsi *vsi)
 {
+	struct i40e_ring *tx_ring, *rx_ring;
 	u16 qoffset, qcount;
 	int i, n;
 
@@ -2428,8 +2429,8 @@ static void i40e_vsi_config_dcb_rings(struct i40e_vsi *vsi)
 		qoffset = vsi->tc_config.tc_info[n].qoffset;
 		qcount = vsi->tc_config.tc_info[n].qcount;
 		for (i = qoffset; i < (qoffset + qcount); i++) {
-			struct i40e_ring *rx_ring = vsi->rx_rings[i];
-			struct i40e_ring *tx_ring = vsi->tx_rings[i];
+			rx_ring = vsi->rx_rings[i];
+			tx_ring = vsi->tx_rings[i];
 			rx_ring->dcb_tc = n;
 			tx_ring->dcb_tc = n;
 		}
@@ -5948,14 +5949,12 @@ static void i40e_vsi_clear_rings(struct i40e_vsi *vsi)
  **/
 static int i40e_alloc_rings(struct i40e_vsi *vsi)
 {
+	struct i40e_ring *tx_ring, *rx_ring;
 	struct i40e_pf *pf = vsi->back;
 	int i;
 
 	/* Set basic values in the rings to be used later during open() */
 	for (i = 0; i < vsi->alloc_queue_pairs; i++) {
-		struct i40e_ring *tx_ring;
-		struct i40e_ring *rx_ring;
-
 		/* allocate space for both Tx and Rx in one shot */
 		tx_ring = kzalloc(sizeof(struct i40e_ring) * 2, GFP_KERNEL);
 		if (!tx_ring)