netdev - Re: Realtek r8168C / r8169 driver VLAN TAG stripping

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Date:	Thu, 13 Jan 2011 20:39:07 +0530
From:	Anand Raj Manickam <anandrm@...il.com>
To:	netdev@...r.kernel.org
Subject: Re: Realtek r8168C / r8169 driver VLAN TAG stripping

Sorry,
This happens on a Linux 2.6.30.8 kernel .The driver is  in-kernel.

On Thu, Jan 13, 2011 at 8:10 PM, Anand Raj Manickam <anandrm@...il.com> wrote:
> 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 pointers are welcome.
> Thanks,
> Anand
>
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