gianfar: Fix VLAN HW feature related frame/buffer size calculation.

Optimize the VLAN checking logic as well.

Signed-off-by: Dai Haruki <dai.haruki@freescale.com>
Acked-by: Andy Fleming <afleming@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 21 insertions, 15 deletions

diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
index 19fdf93e0ec2..6dc9361495bb 100644
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -149,7 +149,7 @@ MODULE_LICENSE("GPL");
 /* Returns 1 if incoming frames use an FCB */
 static inline int gfar_uses_fcb(struct gfar_private *priv)
 {
-        return (priv->vlan_enable || priv->rx_csum_enable);
+        return priv->vlgrp || priv->rx_csum_enable;
 }
 
 static int gfar_of_init(struct net_device *dev)
@@ -376,8 +376,6 @@ static int gfar_probe(struct of_device *ofdev,
                 dev->vlan_rx_register = gfar_vlan_rx_register;
 
                 dev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
-
-                priv->vlan_enable = 1;
         }
 
         if (priv->device_flags & FSL_GIANFAR_DEV_HAS_EXTENDED_HASH) {
@@ -1078,9 +1076,6 @@ int startup_gfar(struct net_device *dev)
                 rctrl |= RCTRL_EMEN;
         }
 
-        if (priv->vlan_enable)
-                rctrl |= RCTRL_VLAN;
-
         if (priv->padding) {
                 rctrl &= ~RCTRL_PAL_MASK;
                 rctrl |= RCTRL_PADDING(priv->padding);
@@ -1241,8 +1236,7 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
                 gfar_tx_checksum(skb, fcb);
         }
 
-        if (priv->vlan_enable &&
-                        unlikely(priv->vlgrp && vlan_tx_tag_present(skb))) {
+        if (priv->vlgrp && vlan_tx_tag_present(skb)) {
                 if (unlikely(NULL == fcb)) {
                         fcb = gfar_add_fcb(skb, txbdp);
                         status |= TXBD_TOE;
@@ -1344,11 +1338,15 @@ static void gfar_vlan_rx_register(struct net_device *dev,
 {
         struct gfar_private *priv = netdev_priv(dev);
         unsigned long flags;
+        struct vlan_group *old_grp;
         u32 tempval;
 
         spin_lock_irqsave(&priv->rxlock, flags);
 
-        priv->vlgrp = grp;
+        old_grp = priv->vlgrp;
+
+        if (old_grp == grp)
+                return;
 
         if (grp) {
                 /* Enable VLAN tag insertion */
@@ -1360,6 +1358,7 @@ static void gfar_vlan_rx_register(struct net_device *dev,
                 /* Enable VLAN tag extraction */
                 tempval = gfar_read(&priv->regs->rctrl);
                 tempval |= RCTRL_VLEX;
+                tempval |= (RCTRL_VLEX | RCTRL_PRSDEP_INIT);
                 gfar_write(&priv->regs->rctrl, tempval);
         } else {
                 /* Disable VLAN tag insertion */
@@ -1370,9 +1369,16 @@ static void gfar_vlan_rx_register(struct net_device *dev,
                 /* Disable VLAN tag extraction */
                 tempval = gfar_read(&priv->regs->rctrl);
                 tempval &= ~RCTRL_VLEX;
+                /* If parse is no longer required, then disable parser */
+                if (tempval & RCTRL_REQ_PARSER)
+                        tempval |= RCTRL_PRSDEP_INIT;
+                else
+                        tempval &= ~RCTRL_PRSDEP_INIT;
                 gfar_write(&priv->regs->rctrl, tempval);
         }
 
+        gfar_change_mtu(dev, dev->mtu);
+
         spin_unlock_irqrestore(&priv->rxlock, flags);
 }
 
@@ -1383,14 +1389,9 @@ static int gfar_change_mtu(struct net_device *dev, int new_mtu)
         int oldsize = priv->rx_buffer_size;
         int frame_size = new_mtu + ETH_HLEN;
 
-        if (priv->vlan_enable)
+        if (priv->vlgrp)
                 frame_size += VLAN_HLEN;
 
-        if (gfar_uses_fcb(priv))
-                frame_size += GMAC_FCB_LEN;
-
-        frame_size += priv->padding;
-
         if ((frame_size < 64) || (frame_size > JUMBO_FRAME_SIZE)) {
                 if (netif_msg_drv(priv))
                         printk(KERN_ERR "%s: Invalid MTU setting\n",
@@ -1398,6 +1399,11 @@ static int gfar_change_mtu(struct net_device *dev, int new_mtu)
                 return -EINVAL;
         }
 
+        if (gfar_uses_fcb(priv))
+                frame_size += GMAC_FCB_LEN;
+
+        frame_size += priv->padding;
+
         tempsize =
             (frame_size & ~(INCREMENTAL_BUFFER_SIZE - 1)) +
             INCREMENTAL_BUFFER_SIZE;