ag71xx driver: add a workaround for the ar8216 chip, until we get a suitable switch driver

SVN-Revision: 14655

target/linux/ar71xx/config-2.6.28

@@ -4,6 +4,7 @@ CONFIG_32BIT=y
 CONFIG_ADM6996_PHY=y
 CONFIG_AG71XX=y
 # CONFIG_AG71XX_DEBUG is not set
+CONFIG_AG71XX_AR8216_SUPPORT=y
 # CONFIG_AR71XX_EARLY_SERIAL is not set
 CONFIG_AR71XX_MACH_AP83=y
 CONFIG_AR71XX_MACH_AW_NR580=y

target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/platform.h

@@ -28,6 +28,7 @@ struct ag71xx_platform_data {
 
 	u8		has_gbit:1;
 	u8		is_ar91xx:1;
+	u8		has_ar8216:1;
 
 	void		(* ddr_flush)(void);
 	void		(* set_pll)(u32 pll);

target/linux/ar71xx/files/drivers/net/ag71xx/Kconfig

@@ -12,3 +12,12 @@ config AG71XX_DEBUG
 	default n
 	help
 	  Atheros AR71xx built-in ethernet driver debugging messages.
+
+config AG71XX_AR8216_SUPPORT
+	bool "special support for the Atheros AR8216 switch"
+	depends on AG71XX
+	default n
+	default y if AR71XX_MACH_WNR2000 || AR71XX_MACH_MZK_W04NU
+	help
+	  Say 'y' here if you want to enable special support for the
+	  Atheros AR8216 switch found on some boards.

target/linux/ar71xx/files/drivers/net/ag71xx/Makefile

@@ -2,6 +2,12 @@
 # Makefile for the Atheros AR71xx built-in ethernet macs
 #
 
+ag71xx-y	+= ag71xx_main.o 
+ag71xx-y	+= ag71xx_ethtool.o 
+ag71xx-y	+= ag71xx_phy.o 
+ag71xx-y	+= ag71xx_mdio.o
+
+ag71xx-$(CONFIG_AG71XX_AR8216_SUPPORT) += ag71xx_ar8216.o
+
 obj-$(CONFIG_AG71XX)	+= ag71xx.o
 
-ag71xx-objs	:= ag71xx_main.o ag71xx_ethtool.o ag71xx_phy.o ag71xx_mdio.o

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

@@ -38,7 +38,7 @@
 #define ETH_FCS_LEN	4
 
 #define AG71XX_DRV_NAME		"ag71xx"
-#define AG71XX_DRV_VERSION	"0.5.20"
+#define AG71XX_DRV_VERSION	"0.5.21"
 
 #define AG71XX_NAPI_WEIGHT	64
 #define AG71XX_OOM_REFILL	(1 + HZ/10)
@@ -430,4 +430,20 @@ static void inline ag71xx_mii_ctrl_set_speed(struct ag71xx *ag,
 	ag71xx_mii_ctrl_wr(ag, t);
 }
 
+#ifdef CONFIG_AG71XX_AR8216_SUPPORT
+void ag71xx_add_ar8216_header(struct ag71xx *ag, struct sk_buff *skb);
+int ag71xx_remove_ar8216_header(struct ag71xx *ag, struct sk_buff *skb);
+#else
+static inline void ag71xx_add_ar8216_header(struct ag71xx *ag,
+					   struct sk_buff *skb)
+{
+}
+
+static inline int ag71xx_remove_ar8216_header(struct ag71xx *ag,
+					      struct sk_buff *skb)
+{
+	return 0;
+}
+#endif
+
 #endif /* _AG71XX_H */

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

@@ -473,6 +473,8 @@ static int ag71xx_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	if (!ag71xx_desc_empty(desc))
 		goto err_drop;
 
+	ag71xx_add_ar8216_header(ag, skb);
+
 	if (skb->len <= 0) {
 		DBG("%s: packet len is too small\n", ag->dev->name);
 		goto err_drop;
@@ -647,15 +649,20 @@ static int ag71xx_rx_packets(struct ag71xx *ag, int limit)
 		skb_put(skb, pktlen);
 
 		skb->dev = dev;
-		skb->protocol = eth_type_trans(skb, dev);
 		skb->ip_summed = CHECKSUM_NONE;
 
-		netif_receive_skb(skb);
-
 		dev->last_rx = jiffies;
 		dev->stats.rx_packets++;
 		dev->stats.rx_bytes += pktlen;
 
+		if (ag71xx_remove_ar8216_header(ag, skb) != 0) {
+			dev->stats.rx_dropped++;
+			kfree_skb(skb);
+		} else {
+			skb->protocol = eth_type_trans(skb, dev);
+			netif_receive_skb(skb);
+		}
+
 		ring->buf[i].skb = NULL;
 		done++;