net: lan78xx: Add support for VLAN tag stripping.

The chip supports stripping the VLAN tag and reporting it
in metadata.
Complete the support for this.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index bd41a36..28da296 100644 (file)
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -64,6 +64,7 @@
 #define DEFAULT_RX_CSUM_ENABLE         (true)
 #define DEFAULT_TSO_CSUM_ENABLE                (true)
 #define DEFAULT_VLAN_FILTER_ENABLE     (true)
+#define DEFAULT_VLAN_RX_OFFLOAD                (true)
 #define TX_OVERHEAD                    (8)
 #define RXW_PADDING                    2
 
@@ -2363,6 +2364,11 @@ static int lan78xx_set_features(struct net_device *netdev,
                pdata->rfe_ctl &= ~(RFE_CTL_ICMP_COE_ | RFE_CTL_IGMP_COE_);
        }
 
+       if (features & NETIF_F_HW_VLAN_CTAG_RX)
+               pdata->rfe_ctl |= RFE_CTL_VLAN_STRIP_;
+       else
+               pdata->rfe_ctl &= ~RFE_CTL_VLAN_STRIP_;
+
        if (features & NETIF_F_HW_VLAN_CTAG_FILTER)
                pdata->rfe_ctl |= RFE_CTL_VLAN_FILTER_;
        else
@@ -2976,6 +2982,9 @@ static int lan78xx_bind(struct lan78xx_net *dev, struct usb_interface *intf)
        if (DEFAULT_TSO_CSUM_ENABLE)
                dev->net->features |= NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_SG;
 
+       if (DEFAULT_VLAN_RX_OFFLOAD)
+               dev->net->features |= NETIF_F_HW_VLAN_CTAG_RX;
+
        if (DEFAULT_VLAN_FILTER_ENABLE)
                dev->net->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
 
@@ -3052,6 +3061,16 @@ static void lan78xx_rx_csum_offload(struct lan78xx_net *dev,
        }
 }
 
+static void lan78xx_rx_vlan_offload(struct lan78xx_net *dev,
+                                   struct sk_buff *skb,
+                                   u32 rx_cmd_a, u32 rx_cmd_b)
+{
+       if ((dev->net->features & NETIF_F_HW_VLAN_CTAG_RX) &&
+           (rx_cmd_a & RX_CMD_A_FVTG_))
+               __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
+                                      (rx_cmd_b & 0xffff));
+}
+
 static void lan78xx_skb_return(struct lan78xx_net *dev, struct sk_buff *skb)
 {
        int             status;
@@ -3116,6 +3135,8 @@ static int lan78xx_rx(struct lan78xx_net *dev, struct sk_buff *skb)
                        if (skb->len == size) {
                                lan78xx_rx_csum_offload(dev, skb,
                                                        rx_cmd_a, rx_cmd_b);
+                               lan78xx_rx_vlan_offload(dev, skb,
+                                                       rx_cmd_a, rx_cmd_b);
 
                                skb_trim(skb, skb->len - 4); /* remove fcs */
                                skb->truesize = size + sizeof(struct sk_buff);
@@ -3134,6 +3155,7 @@ static int lan78xx_rx(struct lan78xx_net *dev, struct sk_buff *skb)
                        skb_set_tail_pointer(skb2, size);
 
                        lan78xx_rx_csum_offload(dev, skb2, rx_cmd_a, rx_cmd_b);
+                       lan78xx_rx_vlan_offload(dev, skb2, rx_cmd_a, rx_cmd_b);
 
                        skb_trim(skb2, skb2->len - 4); /* remove fcs */
                        skb2->truesize = size + sizeof(struct sk_buff);