ar71xx: improve ethernet driver cache footprint by removing an unnecessary pointer

[openwrt.git] / target / linux / ar71xx / files / drivers / net / ethernet / atheros / ag71xx / ag71xx.h

diff --git a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h
index b9d95ad..b18c20b 100644 (file)
--- a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h
+++ b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h
@@ -51,15 +51,15 @@
 #define AG71XX_INT_INIT        (AG71XX_INT_ERR | AG71XX_INT_POLL)
 
 #define AG71XX_TX_MTU_LEN      1540
-#define AG71XX_RX_PKT_SIZE     \
-       (ETH_FRAME_LEN + ETH_FCS_LEN + VLAN_HLEN)
-#define AG71XX_RX_BUF_SIZE (AG71XX_RX_PKT_SIZE + NET_SKB_PAD + NET_IP_ALIGN)
 
-#define AG71XX_TX_RING_SIZE_DEFAULT    64
+#define AG71XX_TX_RING_SPLIT           512
+#define AG71XX_TX_RING_DS_PER_PKT      DIV_ROUND_UP(AG71XX_TX_MTU_LEN, \
+                                                    AG71XX_TX_RING_SPLIT)
+#define AG71XX_TX_RING_SIZE_DEFAULT    48
 #define AG71XX_RX_RING_SIZE_DEFAULT    128
 
-#define AG71XX_TX_RING_SIZE_MAX                256
-#define AG71XX_RX_RING_SIZE_MAX                256
+#define AG71XX_TX_RING_SIZE_MAX                48
+#define AG71XX_RX_RING_SIZE_MAX                128
 
 #ifdef CONFIG_AG71XX_DEBUG
 #define DBG(fmt, args...)      pr_debug(fmt, ## args)
@@ -90,16 +90,19 @@ struct ag71xx_buf {
                struct sk_buff  *skb;
                void            *rx_buf;
        };
-       struct ag71xx_desc      *desc;
-       dma_addr_t              dma_addr;
-       unsigned long           timestamp;
+       union {
+               dma_addr_t      dma_addr;
+               unsigned long   timestamp;
+       };
+       unsigned int            len;
 };
 
 struct ag71xx_ring {
        struct ag71xx_buf       *buf;
        u8                      *descs_cpu;
        dma_addr_t              descs_dma;
-       unsigned int            desc_size;
+       u16                     desc_split;
+       u16                     desc_size;
        unsigned int            curr;
        unsigned int            dirty;
        unsigned int            size;
@@ -165,6 +168,10 @@ struct ag71xx {
        unsigned int            speed;
        int                     duplex;
 
+       unsigned int            max_frame_len;
+       unsigned int            desc_pktlen_mask;
+       unsigned int            rx_buf_size;
+
        struct work_struct      restart_work;
        struct delayed_work     link_work;
        struct timer_list       oom_timer;
@@ -195,9 +202,10 @@ static inline int ag71xx_desc_empty(struct ag71xx_desc *desc)
        return (desc->ctrl & DESC_EMPTY) != 0;
 }
 
-static inline int ag71xx_desc_pktlen(struct ag71xx_desc *desc)
+static inline struct ag71xx_desc *
+ag71xx_ring_desc(struct ag71xx_ring *ring, int idx)
 {
-       return desc->ctrl & DESC_PKTLEN_M;
+       return (struct ag71xx_desc *) &ring->descs_cpu[idx * ring->desc_size];
 }
 
 /* Register offsets */