ixgbe: Move interrupt related values out of ring and into q_vector

This change moves work_limit, total_packets, and total_bytes into the ring
container struct of the q_vector.  The advantage of this is that it should
reduce the size of memory used in the event of multiple rings being
assigned to a single q_vector.  In addition it should help to reduce the
total workload for calculating itr since now total_packets and total_bytes
will be the total work done of the interrupt instead of for the ring.
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ixgbe/ixgbe.h

@@ -214,12 +214,10 @@ struct ixgbe_ring {
 		struct ixgbe_rx_buffer *rx_buffer_info;
 	};
 	unsigned long state;
-	u8 atr_sample_rate;
-	u8 atr_count;
+	u8 __iomem *tail;
+
 	u16 count;			/* amount of descriptors */
 	u16 rx_buf_len;
-	u16 next_to_use;
-	u16 next_to_clean;
 
 	u8 queue_index; /* needed for multiqueue queue management */
 	u8 reg_idx;			/* holds the special value that gets
@@ -227,15 +225,13 @@ struct ixgbe_ring {
 					 * associated with this ring, which is
 					 * different for DCB and RSS modes
 					 */
-	u8 dcb_tc;
-
-	u16 work_limit;			/* max work per interrupt */
-
-	u8 __iomem *tail;
+	u8 atr_sample_rate;
+	u8 atr_count;
 
-	unsigned int total_bytes;
-	unsigned int total_packets;
+	u16 next_to_use;
+	u16 next_to_clean;
 
+	u8 dcb_tc;
 	struct ixgbe_queue_stats stats;
 	struct u64_stats_sync syncp;
 	union {
@@ -283,6 +279,9 @@ struct ixgbe_ring_container {
 #else
 	DECLARE_BITMAP(idx, MAX_TX_QUEUES);
 #endif
+	unsigned int total_bytes;	/* total bytes processed this int */
+	unsigned int total_packets;	/* total packets processed this int */
+	u16 work_limit;			/* total work allowed per interrupt */
 	u8 count;			/* total number of rings in vector */
 	u8 itr;				/* current ITR setting for ring */
 };
@@ -417,6 +416,9 @@ struct ixgbe_adapter {
 	u16 eitr_low;
 	u16 eitr_high;
 
+	/* Work limits */
+	u16 tx_work_limit;
+
 	/* TX */
 	struct ixgbe_ring *tx_ring[MAX_TX_QUEUES] ____cacheline_aligned_in_smp;
 	int num_tx_queues;

drivers/net/ixgbe/ixgbe_ethtool.c

@@ -2103,7 +2103,7 @@ static int ixgbe_get_coalesce(struct net_device *netdev,
 {
 	struct ixgbe_adapter *adapter = netdev_priv(netdev);
 
-	ec->tx_max_coalesced_frames_irq = adapter->tx_ring[0]->work_limit;
+	ec->tx_max_coalesced_frames_irq = adapter->tx_work_limit;
 
 	/* only valid if in constant ITR mode */
 	switch (adapter->rx_itr_setting) {
@@ -2192,7 +2192,7 @@ static int ixgbe_set_coalesce(struct net_device *netdev,
 		return -EINVAL;
 
 	if (ec->tx_max_coalesced_frames_irq)
-		adapter->tx_ring[0]->work_limit = ec->tx_max_coalesced_frames_irq;
+		adapter->tx_work_limit = ec->tx_max_coalesced_frames_irq;
 
 	if (ec->rx_coalesce_usecs > 1) {
 		/* check the limits */
@@ -2267,12 +2267,14 @@ static int ixgbe_set_coalesce(struct net_device *netdev,
 			else
 				/* rx only or mixed */
 				q_vector->eitr = adapter->rx_eitr_param;
+			q_vector->tx.work_limit = adapter->tx_work_limit;
 			ixgbe_write_eitr(q_vector);
 		}
 	/* Legacy Interrupt Mode */
 	} else {
 		q_vector = adapter->q_vector[0];
 		q_vector->eitr = adapter->rx_eitr_param;
+		q_vector->tx.work_limit = adapter->tx_work_limit;
 		ixgbe_write_eitr(q_vector);
 	}