ixgbe: Reorder adapter contents for better cache utilization

This change moves several frequently accessed items together into one cache
line in order to reduce cache misses in the hot-path.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Stephen Ko <stephen.s.ko@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbe/ixgbe.h

@@ -373,8 +373,16 @@ static inline u16 ixgbe_desc_unused(struct ixgbe_ring *ring)
 #define MIN_MSIX_Q_VECTORS 2
 #define MIN_MSIX_COUNT (MIN_MSIX_Q_VECTORS + NON_Q_VECTORS)
 
+/* default to trying for four seconds */
+#define IXGBE_TRY_LINK_TIMEOUT (4 * HZ)
+
 /* board specific private data structure */
 struct ixgbe_adapter {
+	unsigned long active_vlans[BITS_TO_LONGS(VLAN_N_VID)];
+	/* OS defined structs */
+	struct net_device *netdev;
+	struct pci_dev *pdev;
+
 	unsigned long state;
 
 	/* Some features need tri-state capability,
@@ -418,8 +426,35 @@ struct ixgbe_adapter {
 #define IXGBE_FLAG2_RESET_REQUESTED             (u32)(1 << 6)
 #define IXGBE_FLAG2_FDIR_REQUIRES_REINIT        (u32)(1 << 7)
 
-	unsigned long active_vlans[BITS_TO_LONGS(VLAN_N_VID)];
-	u16 bd_number;
+
+	/* Tx fast path data */
+	int num_tx_queues;
+	u16 tx_itr_setting;
+	u16 tx_work_limit;
+
+	/* Rx fast path data */
+	int num_rx_queues;
+	u16 rx_itr_setting;
+
+	/* TX */
+	struct ixgbe_ring *tx_ring[MAX_TX_QUEUES] ____cacheline_aligned_in_smp;
+
+	u64 restart_queue;
+	u64 lsc_int;
+	u32 tx_timeout_count;
+
+	/* RX */
+	struct ixgbe_ring *rx_ring[MAX_RX_QUEUES];
+	int num_rx_pools;		/* == num_rx_queues in 82598 */
+	int num_rx_queues_per_pool;	/* 1 if 82598, can be many if 82599 */
+	u64 hw_csum_rx_error;
+	u64 hw_rx_no_dma_resources;
+	u64 rsc_total_count;
+	u64 rsc_total_flush;
+	u64 non_eop_descs;
+	u32 alloc_rx_page_failed;
+	u32 alloc_rx_buff_failed;
+
 	struct ixgbe_q_vector *q_vector[MAX_MSIX_Q_VECTORS];
 
 	/* DCB parameters */
@@ -431,47 +466,11 @@ struct ixgbe_adapter {
 	u8 dcbx_cap;
 	enum ixgbe_fc_mode last_lfc_mode;
 
-	/* Interrupt Throttle Rate */
-	u32 rx_itr_setting;
-	u32 tx_itr_setting;
-	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;
-	u32 tx_timeout_count;
-	bool detect_tx_hung;
-
-	u64 restart_queue;
-	u64 lsc_int;
-
-	/* RX */
-	struct ixgbe_ring *rx_ring[MAX_RX_QUEUES] ____cacheline_aligned_in_smp;
-	int num_rx_queues;
-	int num_rx_pools;		/* == num_rx_queues in 82598 */
-	int num_rx_queues_per_pool;	/* 1 if 82598, can be many if 82599 */
-	u64 hw_csum_rx_error;
-	u64 hw_rx_no_dma_resources;
-	u64 non_eop_descs;
 	int num_msix_vectors;
 	int max_msix_q_vectors;         /* true count of q_vectors for device */
 	struct ixgbe_ring_feature ring_feature[RING_F_ARRAY_SIZE];
 	struct msix_entry *msix_entries;
 
-	u32 alloc_rx_page_failed;
-	u32 alloc_rx_buff_failed;
-
-/* default to trying for four seconds */
-#define IXGBE_TRY_LINK_TIMEOUT (4 * HZ)
-
-	/* OS defined structs */
-	struct net_device *netdev;
-	struct pci_dev *pdev;
-
 	u32 test_icr;
 	struct ixgbe_ring test_tx_ring;
 	struct ixgbe_ring test_rx_ring;
@@ -481,10 +480,6 @@ struct ixgbe_adapter {
 	u16 msg_enable;
 	struct ixgbe_hw_stats stats;
 
-	/* Interrupt Throttle Rate */
-	u32 rx_eitr_param;
-	u32 tx_eitr_param;
-
 	u64 tx_busy;
 	unsigned int tx_ring_count;
 	unsigned int rx_ring_count;
@@ -493,25 +488,35 @@ struct ixgbe_adapter {
 	bool link_up;
 	unsigned long link_check_timeout;
 
-	struct work_struct service_task;
 	struct timer_list service_timer;
+	struct work_struct service_task;
+
+	struct hlist_head fdir_filter_list;
+	unsigned long fdir_overflow; /* number of times ATR was backed off */
+	union ixgbe_atr_input fdir_mask;
+	int fdir_filter_count;
 	u32 fdir_pballoc;
 	u32 atr_sample_rate;
-	unsigned long fdir_overflow; /* number of times ATR was backed off */
 	spinlock_t fdir_perfect_lock;
+
 #ifdef IXGBE_FCOE
 	struct ixgbe_fcoe fcoe;
 #endif /* IXGBE_FCOE */
-	u64 rsc_total_count;
-	u64 rsc_total_flush;
 	u32 wol;
+
+	/* Interrupt Throttle Rate */
+	u16 eitr_low;
+	u16 eitr_high;
+
+	u16 bd_number;
+
 	u16 eeprom_verh;
 	u16 eeprom_verl;
 	u16 eeprom_cap;
 
 	int node;
-	u32 led_reg;
 	u32 interrupt_event;
+	u32 led_reg;
 
 	/* SR-IOV */
 	DECLARE_BITMAP(active_vfs, IXGBE_MAX_VF_FUNCTIONS);
@@ -521,9 +526,6 @@ struct ixgbe_adapter {
 	struct vf_macvlans vf_mvs;
 	struct vf_macvlans *mv_list;
 
-	struct hlist_head fdir_filter_list;
-	union ixgbe_atr_input fdir_mask;
-	int fdir_filter_count;
 	u32 timer_event_accumulator;
 	u32 vferr_refcount;
 };