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>

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
index f05bfdb..c5cd2b6 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
+++ b/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,
@@ -418,59 +426,50 @@ 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;
-       struct ixgbe_q_vector *q_vector[MAX_MSIX_Q_VECTORS];
 
-       /* DCB parameters */
-       struct ieee_pfc *ixgbe_ieee_pfc;
-       struct ieee_ets *ixgbe_ieee_ets;
-       struct ixgbe_dcb_config dcb_cfg;
-       struct ixgbe_dcb_config temp_dcb_cfg;
-       u8 dcb_set_bitmap;
-       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 */
+       /* 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;
-       int num_tx_queues;
-       u32 tx_timeout_count;
-       bool detect_tx_hung;
 
        u64 restart_queue;
        u64 lsc_int;
+       u32 tx_timeout_count;
 
        /* RX */
-       struct ixgbe_ring *rx_ring[MAX_RX_QUEUES] ____cacheline_aligned_in_smp;
-       int num_rx_queues;
+       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;
-       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)
+       struct ixgbe_q_vector *q_vector[MAX_MSIX_Q_VECTORS];
 
-       /* OS defined structs */
-       struct net_device *netdev;
-       struct pci_dev *pdev;
+       /* DCB parameters */
+       struct ieee_pfc *ixgbe_ieee_pfc;
+       struct ieee_ets *ixgbe_ieee_ets;
+       struct ixgbe_dcb_config dcb_cfg;
+       struct ixgbe_dcb_config temp_dcb_cfg;
+       u8 dcb_set_bitmap;
+       u8 dcbx_cap;
+       enum ixgbe_fc_mode last_lfc_mode;
+
+       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 test_icr;
        struct ixgbe_ring test_tx_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;
 };