netdev - Re: set vlan CFI and TPID

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Message-ID: <AANLkTim3Rm91O2n6dCqTJYja8fy_sb0dKthCA1rf=FPV@mail.gmail.com>
Date:	Sun, 12 Dec 2010 16:20:58 -0800
From:	Jesse Gross <jesse@...ira.com>
To:	hong zhiyi <zhiyi.hong@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: set vlan CFI and TPID

On Tue, Dec 7, 2010 at 8:04 PM, hong zhiyi <zhiyi.hong@...il.com> wrote:
> Hi All,
>
> May I ask how to set the 1 bit CFI and 2 bytesTPID in the VLAN header
> by vconfig?

You can't change them using vconfig.  For 802.1q/Ethernet, the TPID is
0x8100 and the CFI is 0.

> and what is the meaning of the egress map and ingress map?

These convert between the PCP bits found in the vlan header and the
priority field that is used internally for QoS, which you access
through tc.
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