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

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Message-ID: <AANLkTi=OwsMO8x9AOy=MmohU4SSQcv+o=TvwNs0NNsQR@mail.gmail.com>
Date:	Thu, 27 Jan 2011 21:01:44 +0530
From:	Anand Raj Manickam <anandrm@...il.com>
To:	Francois Romieu <romieu@...zoreil.com>
Cc:	netdev@...r.kernel.org, Hayes <hayeswang@...ltek.com>
Subject: Re: Realtek r8168C / r8169 driver VLAN TAG stripping

On Thu, Jan 27, 2011 at 8:37 PM, Francois Romieu <romieu@...zoreil.com> wrote:
> Anand Raj Manickam <anandrm@...il.com> :
> [...]
>> We upgraded to 2.6.36 kernel . The result is SAME.
>> The VLAN tag gets stripped ;-)
>> Do let me know if you need more info .
>

> - ip addr show

3: eth0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:17:54:00:f6:62 brd ff:ff:ff:ff:ff:ff
    inet 172.16.1.1/16 brd 172.16.255.255 scope global eth0
    inet6 fe80::217:54ff:fe00:f662/64 scope link
       valid_lft forever preferred_lft forever

8: eth0.50@...0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc noqueue
    link/ether 00:17:54:00:f6:62 brd ff:ff:ff:ff:ff:ff
    inet 172.16.10.10/24 brd 172.16.10.255 scope global eth0.50
    inet6 fe80::217:54ff:fe00:f662/64 scope link
       valid_lft forever preferred_lft forever


> - ethtool -k eth0

Offload parameters for eth0:
rx-checksumming: on
tx-checksumming: off
scatter-gather: off
tcp segmentation offload: off
udp fragmentation offload: off
generic segmentation offload: off



> I do not get the "VLAN tag gets stripped" concept, especially on Tx.
> Does it mean "no packet" or "a packet whose content is wrong" ?

Sorry for not being clear ;-)

When we transmit a packet with VLAN TAG , the TAG get stripped when
transmitted through the device , the other end trunk port / sniffer
does NOT see a TAG.
Similarly , when a VLAN Tagged packet is sent from the other end , The
TAG gets stripped by the device , We DONOT see the tag .

I use tcpdump -i eth0 -n -nn -e vlan 50
to see if the packets are gettin tagged or NOT .

The same config works on forcedeth


Thanks,
Anand

>
> --
> Ueimor
>
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