ar8216: add delay for page switching to work around register setting corruption. use packet mangling to fix up the vlan for incoming packets (workaround for hardware bug, which renders normal 802.1q support unusable)

SVN-Revision: 16442

target/linux/generic-2.6/files/drivers/net/phy/ar8216.c

@@ -27,16 +27,19 @@
 #include <linux/switch.h>
 #include <linux/delay.h>
 #include <linux/phy.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
 #include "ar8216.h"
 
-#define AR8216_REG_PORT_RATE(_i)	(AR8216_PORT_OFFSET(_i) + 0x000c)
-#define AR8216_REG_PORT_PRIO(_i)	(AR8216_PORT_OFFSET(_i) + 0x0010)
 
 struct ar8216_priv {
+	int (*hardstart)(struct sk_buff *skb, struct net_device *dev);
+
 	struct switch_dev dev;
 	struct phy_device *phy;
 	u32 (*read)(struct ar8216_priv *priv, int reg);
 	void (*write)(struct ar8216_priv *priv, int reg, u32 val);
+
 	/* all fields below are cleared on reset */
 	bool vlan;
 	u8 vlan_id[AR8216_NUM_VLANS];
@@ -70,6 +73,7 @@ ar8216_mii_read(struct ar8216_priv *priv, int reg)
 
 	split_addr((u32) reg, &r1, &r2, &page);
 	phy->bus->write(phy->bus, 0x18, 0, page);
+	msleep(1); /* wait for the page switch to propagate */
 	lo = phy->bus->read(phy->bus, 0x10 | r2, r1);
 	hi = phy->bus->read(phy->bus, 0x10 | r2, r1 + 1);
 
@@ -85,6 +89,7 @@ ar8216_mii_write(struct ar8216_priv *priv, int reg, u32 val)
 
 	split_addr((u32) reg, &r1, &r2, &r3);
 	phy->bus->write(phy->bus, 0x18, 0, r3);
+	msleep(1); /* wait for the page switch to propagate */
 
 	lo = val & 0xffff;
 	hi = (u16) (val >> 16);
@@ -159,6 +164,103 @@ ar8216_get_vid(struct switch_dev *dev, const struct switch_attr *attr,
 }
 
 
+static int
+ar8216_mangle_tx(struct sk_buff *skb, struct net_device *dev)
+{
+	struct ar8216_priv *priv = dev->phy_ptr;
+	unsigned char *buf;
+
+    if (unlikely(!priv))
+        goto error;
+
+	if (!priv->vlan)
+		goto send;
+
+	if (unlikely(skb_headroom(skb) < 2)) {
+		if (pskb_expand_head(skb, 2, 0, GFP_ATOMIC) < 0)
+			goto error;
+	}
+
+	buf = skb_push(skb, 2);
+	buf[0] = 0x10;
+	buf[1] = 0x80;
+
+send:
+	return priv->hardstart(skb, dev);
+
+error:
+	dev_kfree_skb_any(skb);
+	return 0;
+}
+
+static int
+ar8216_mangle_rx(struct sk_buff *skb, int napi)
+{
+	struct ar8216_priv *priv;
+	struct net_device *dev;
+	unsigned char *buf;
+	int port, vlan;
+
+	dev = skb->dev;
+	if (!dev)
+		goto error;
+
+	priv = dev->phy_ptr;
+	if (!priv)
+		goto error;
+
+	/* don't strip the header if vlan mode is disabled */
+	if (!priv->vlan)
+		goto recv;
+
+	/* strip header, get vlan id */
+	buf = skb->data;
+	skb_pull(skb, 2);
+
+	/* check for vlan header presence */
+	if ((buf[12 + 2] != 0x81) || (buf[13 + 2] != 0x00))
+		goto recv;
+
+	port = buf[0] & 0xf;
+
+	/* no need to fix up packets coming from a tagged source */
+	if (priv->vlan_tagged & (1 << port))
+		goto recv;
+
+	/* lookup port vid from local table, the switch passes an invalid vlan id */
+	vlan = priv->pvid[port];
+
+	buf[14 + 2] &= 0xf0;
+	buf[14 + 2] |= vlan >> 8;
+	buf[15 + 2] = vlan & 0xff;
+
+recv:
+	skb->protocol = eth_type_trans(skb, skb->dev);
+
+	if (napi)
+		return netif_receive_skb(skb);
+	else
+		return netif_rx(skb);
+
+error:
+	/* no vlan? eat the packet! */
+	dev_kfree_skb_any(skb);
+	return 0;
+}
+
+static int
+ar8216_netif_rx(struct sk_buff *skb)
+{
+	return ar8216_mangle_rx(skb, 0);
+}
+
+static int
+ar8216_netif_receive_skb(struct sk_buff *skb)
+{
+	return ar8216_mangle_rx(skb, 1);
+}
+
+
 static struct switch_attr ar8216_globals[] = {
 	{
 		.type = SWITCH_TYPE_INT,
@@ -327,19 +429,18 @@ ar8216_hw_apply(struct switch_dev *dev)
 
 		if (priv->vlan && (priv->vlan_tagged & (1 << i))) {
 			egress = AR8216_OUT_ADD_VLAN;
-			ingress = AR8216_IN_PORT_FALLBACK;
 		} else {
 			egress = AR8216_OUT_STRIP_VLAN;
-			ingress = AR8216_IN_SECURE;
 		}
+		ingress = AR8216_IN_SECURE;
 
 		ar8216_rmw(priv, AR8216_REG_PORT_CTRL(i),
 			AR8216_PORT_CTRL_LEARN | AR8216_PORT_CTRL_VLAN_MODE |
 			AR8216_PORT_CTRL_SINGLE_VLAN | AR8216_PORT_CTRL_STATE |
 			AR8216_PORT_CTRL_HEADER | AR8216_PORT_CTRL_LEARN_LOCK,
 			AR8216_PORT_CTRL_LEARN |
+			  (i == AR8216_PORT_CPU ? AR8216_PORT_CTRL_HEADER : 0) |
 			  (egress << AR8216_PORT_CTRL_VLAN_MODE_S) |
-			  (priv->vlan ? AR8216_PORT_CTRL_SINGLE_VLAN : 0) |
 			  (AR8216_PORT_STATE_FORWARD << AR8216_PORT_CTRL_STATE_S));
 
 		ar8216_rmw(priv, AR8216_REG_PORT_VLAN(i),
@@ -394,6 +495,7 @@ static int
 ar8216_config_init(struct phy_device *pdev)
 {
 	struct ar8216_priv *priv;
+	struct net_device *dev = pdev->attached_dev;
 	int ret;
 
 	printk("%s: AR8216 PHY driver attached.\n", pdev->attached_dev->name);
@@ -415,6 +517,16 @@ ar8216_config_init(struct phy_device *pdev)
 	}
 
 	ret = ar8216_reset_switch(&priv->dev);
+	if (ret)
+		goto done;
+
+	dev->phy_ptr = priv;
+	pdev->pkt_align = 2;
+	priv->hardstart = dev->hard_start_xmit;
+	pdev->netif_receive_skb = ar8216_netif_receive_skb;
+	pdev->netif_rx = ar8216_netif_rx;
+	dev->hard_start_xmit = ar8216_mangle_tx;
+
 done:
 	return ret;
 }
@@ -465,10 +577,13 @@ static void
 ar8216_remove(struct phy_device *pdev)
 {
 	struct ar8216_priv *priv = pdev->priv;
+	struct net_device *dev = pdev->attached_dev;
 
 	if (!priv)
 		return;
 
+	if (priv->hardstart && dev)
+		dev->hard_start_xmit = priv->hardstart;
 	unregister_switch(&priv->dev);
 	kfree(priv);
 }

target/linux/generic-2.6/files/drivers/net/phy/ar8216.h

@@ -120,6 +120,9 @@
 #define   AR8216_PORT_VLAN_MODE		BITS(30, 2)
 #define   AR8216_PORT_VLAN_MODE_S	30
 
+#define AR8216_REG_PORT_RATE(_i)	(AR8216_PORT_OFFSET(_i) + 0x000c)
+#define AR8216_REG_PORT_PRIO(_i)	(AR8216_PORT_OFFSET(_i) + 0x0010)
+
 /* ingress 802.1q mode */
 enum {
 	AR8216_IN_PORT_ONLY = 0,