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Commit ec21ecf0 authored by Dave Stevenson's avatar Dave Stevenson Committed by David S. Miller
Browse files

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: default avatarDave Stevenson <dave.stevenson@raspberrypi.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4a27327b

drivers/net/usb/lan78xx.c

+22 −0
Original line number Diff line number Diff line
@@ -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);