ar71xx: on ar716x, split ethernet packets in 512 byte chunks instead of 256...

ar71xx: on ar716x, split ethernet packets in 512 byte chunks instead of 256 (improves performance) (patch from #13072)

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42427 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h

@@ -52,7 +52,7 @@
 
 #define AG71XX_TX_MTU_LEN	1540
 
-#define AG71XX_TX_RING_SPLIT		256
+#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