ixgbe: make q_vectors dynamic to reduce netdev size

Currently the q_vectors are being allocated statically inside of the
adapter struct.  This increases the overall size of the adapter struct when
we can easily allocate the vectors dynamically.  This patch changes that
behavior so that the q_vectors are allocated dynamically and the napi
structures are automatically allocated inside of the q_vectors as needed.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ixgbe/ixgbe.h

@@ -187,6 +187,7 @@ struct ixgbe_q_vector {
 	u8 tx_itr;
 	u8 rx_itr;
 	u32 eitr;
+	u32 v_idx;        /* vector index in list */
 };
 
 /* Helper macros to switch between ints/sec and what the register uses.
@@ -230,7 +231,7 @@ struct ixgbe_adapter {
 	struct vlan_group *vlgrp;
 	u16 bd_number;
 	struct work_struct reset_task;
-	struct ixgbe_q_vector q_vector[MAX_MSIX_Q_VECTORS];
+	struct ixgbe_q_vector *q_vector[MAX_MSIX_Q_VECTORS];
 	char name[MAX_MSIX_COUNT][IFNAMSIZ + 9];
 	struct ixgbe_dcb_config dcb_cfg;
 	struct ixgbe_dcb_config temp_dcb_cfg;
@@ -367,8 +368,8 @@ extern int ixgbe_setup_tx_resources(struct ixgbe_adapter *, struct ixgbe_ring *)
 extern void ixgbe_free_rx_resources(struct ixgbe_adapter *, struct ixgbe_ring *);
 extern void ixgbe_free_tx_resources(struct ixgbe_adapter *, struct ixgbe_ring *);
 extern void ixgbe_update_stats(struct ixgbe_adapter *adapter);
-extern void ixgbe_reset_interrupt_capability(struct ixgbe_adapter *adapter);
 extern int ixgbe_init_interrupt_scheme(struct ixgbe_adapter *adapter);
+extern void ixgbe_clear_interrupt_scheme(struct ixgbe_adapter *adapter);
 void ixgbe_napi_add_all(struct ixgbe_adapter *adapter);
 void ixgbe_napi_del_all(struct ixgbe_adapter *adapter);
 extern void ixgbe_write_eitr(struct ixgbe_adapter *, int, u32);

drivers/net/ixgbe/ixgbe_dcb_nl.c

@@ -124,13 +124,7 @@ static u8 ixgbe_dcbnl_set_state(struct net_device *netdev, u8 state)
 
 		if (netif_running(netdev))
 			netdev->netdev_ops->ndo_stop(netdev);
-		ixgbe_reset_interrupt_capability(adapter);
-		ixgbe_napi_del_all(adapter);
-		INIT_LIST_HEAD(&netdev->napi_list);
-		kfree(adapter->tx_ring);
-		kfree(adapter->rx_ring);
-		adapter->tx_ring = NULL;
-		adapter->rx_ring = NULL;
+		ixgbe_clear_interrupt_scheme(adapter);
 
 		adapter->hw.fc.requested_mode = ixgbe_fc_pfc;
 		adapter->flags &= ~IXGBE_FLAG_RSS_ENABLED;
@@ -144,13 +138,7 @@ static u8 ixgbe_dcbnl_set_state(struct net_device *netdev, u8 state)
 			adapter->hw.fc.requested_mode = ixgbe_fc_default;
 			if (netif_running(netdev))
 				netdev->netdev_ops->ndo_stop(netdev);
-			ixgbe_reset_interrupt_capability(adapter);
-			ixgbe_napi_del_all(adapter);
-			INIT_LIST_HEAD(&netdev->napi_list);
-			kfree(adapter->tx_ring);
-			kfree(adapter->rx_ring);
-			adapter->tx_ring = NULL;
-			adapter->rx_ring = NULL;
+			ixgbe_clear_interrupt_scheme(adapter);
 
 			adapter->flags &= ~IXGBE_FLAG_DCB_ENABLED;
 			adapter->flags |= IXGBE_FLAG_RSS_ENABLED;

drivers/net/ixgbe/ixgbe_ethtool.c

@@ -1114,7 +1114,7 @@ static int ixgbe_set_coalesce(struct net_device *netdev,
 	}
 
 	for (i = 0; i < adapter->num_msix_vectors - NON_Q_VECTORS; i++) {
-		struct ixgbe_q_vector *q_vector = &adapter->q_vector[i];
+		struct ixgbe_q_vector *q_vector = adapter->q_vector[i];
 		if (q_vector->txr_count && !q_vector->rxr_count)
 			/* tx vector gets half the rate */
 			q_vector->eitr = (adapter->eitr_param >> 1);