ixgbe: Re-adjust ring layouts to have better cacheline efficiency

This patch rearranges the ixgbe_ring struct to make better use of
cacheline efficiency.

Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ixgbe/ixgbe.h b/drivers/net/ixgbe/ixgbe.h
index f2206e2..cd22323 100644 (file)
--- a/drivers/net/ixgbe/ixgbe.h
+++ b/drivers/net/ixgbe/ixgbe.h
@@ -121,19 +121,18 @@ struct ixgbe_queue_stats {
 
 struct ixgbe_ring {
        void *desc;                     /* descriptor ring memory */
-       dma_addr_t dma;                 /* phys. address of descriptor ring */
-       unsigned int size;              /* length in bytes */
-       unsigned int count;             /* amount of descriptors */
-       unsigned int next_to_use;
-       unsigned int next_to_clean;
-       u8 atr_sample_rate;
-       u8 atr_count;
-
-       int queue_index; /* needed for multiqueue queue management */
        union {
                struct ixgbe_tx_buffer *tx_buffer_info;
                struct ixgbe_rx_buffer *rx_buffer_info;
        };
+       u8 atr_sample_rate;
+       u8 atr_count;
+       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 */
 
        u16 head;
        u16 tail;
@@ -141,20 +140,24 @@ struct ixgbe_ring {
        unsigned int total_bytes;
        unsigned int total_packets;
 
-       u16 reg_idx; /* holds the special value that gets the hardware register
-                     * offset associated with this ring, which is different
-                     * for DCB and RSS modes */
-
 #ifdef CONFIG_IXGBE_DCA
        /* cpu for tx queue */
        int cpu;
 #endif
+
+       u16 work_limit;                 /* max work per interrupt */
+       u16 reg_idx;                    /* holds the special value that gets
+                                        * the hardware register offset
+                                        * associated with this ring, which is
+                                        * different for DCB and RSS modes
+                                        */
+
        struct ixgbe_queue_stats stats;
        unsigned long reinit_state;
+       u64 rsc_count;                  /* stat for coalesced packets */
 
-       u16 work_limit;                /* max work per interrupt */
-       u16 rx_buf_len;
-       u64 rsc_count;                 /* stat for coalesced packets */
+       unsigned int size;              /* length in bytes */
+       dma_addr_t dma;                 /* phys. address of descriptor ring */
 };
 
 enum ixgbe_ring_f_enum {