ar71xx: ag71xx: compute the RX buffer size from the maximum frame size

Currently, the AG71XX_RX_PKT_SIZE value limits the received
frame size to 1514/1516 bytes with/without a VLAN header
respectively. However the hardware limit is controlled by
the value the AG71XX_REG_MAC_MFL register which contains
the value of the max_frame_len field.

Compute the RX buffer size from the max_frame_len field
to get rid of the 1514/1516 byte limitation. Also remove
the unused AG71XX_RX_PKT_SIZE definition.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 39121

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

@@ -51,8 +51,6 @@
 #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_TX_RING_SIZE_DEFAULT	32
 #define AG71XX_RX_RING_SIZE_DEFAULT	128

target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c

@@ -609,7 +609,7 @@ static int ag71xx_open(struct net_device *dev)
 	struct ag71xx *ag = netdev_priv(dev);
 	int ret;
 
-	ag->rx_buf_size = AG71XX_RX_PKT_SIZE + NET_SKB_PAD + NET_IP_ALIGN;
+	ag->rx_buf_size = ag->max_frame_len + NET_SKB_PAD + NET_IP_ALIGN;
 
 	ret = ag71xx_rings_init(ag);
 	if (ret)