netdev - Realtek r8168C / r8169 driver VLAN TAG stripping

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Message-ID: <AANLkTi=qVSEh=RyzJ6y4kQvJW+hxqWMh2gAMmhk7GGob@mail.gmail.com>
Date:	Thu, 13 Jan 2011 20:10:44 +0530
From:	Anand Raj Manickam <anandrm@...il.com>
To:	netdev@...r.kernel.org
Subject: Realtek r8168C / r8169 driver VLAN TAG stripping

Hi ,
I have a problem on Realtek 8168C chipset - r8169 Driver .
The VLAN tag on Tx  & Rx gets stripped .

The 8021q module is loaded .
vconfig add eth0 50
ifconfig eth0.50 172.16.1.10 up

ping -I eth0.50 172.16.1.1 .

All packets on Tx & Rx have the VLAN tag stripped on Tx & Rx.

On debugging the Driver , we found that on Tx the VLAN tag is present.

static int rtl8169_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
.
.
tp->tx_skb[entry].len = len;
txd->addr = cpu_to_le64(mapping);
txd->opts2 = cpu_to_le32(rtl8169_tx_vlan_tag(tp, skb));
printk("The Vlan tag %x \n",txd->opts2);
.
.
}

The Vlan tag 23200

In the above value 23200
2 - TxVlanTag
32 - Vlan tag (50).

>From the above we are clear that the Vlan tag reaches the driver .

Can someone shed some light on this issue ?
Any pointer are welcome.
Thanks,
Anand
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