Re: Re: newbie question on enabling vlan feature in the driver

Ben Greear <greearb@xxxxxxxxxxxxxxx> · Tue, 13 Mar 2007 13:26:05 -0700

Muthu Kumar wrote:

Ben,

Thanks for your response. The mac data sheet says, when 0x8100 is 

written to the

van1_tag register, the mac compares 13th & 14th bytes of incoming frame 

and, if it

finds a match, it sets vlan1 bit in rx status register. However, this 

particular status

bit is not actually exposed to driver access. The documentation could be 

wrong.

So, it sounds like you can completely ignore this 'feature'.

Other than the above, no behaviour changes. In this case, I just simply 

ensure

that the driver/chip can handle MTU + 4 bytes? No need to enable 

NETIF_VLAN_HW_TX/RX

and related callbacks?

I believe so.

By the way, I don't see my postings @ 

http://ns2.lanforge.com/pipermail/vlan/2007-March/thread.html.

I'll try to look into that soon.

Thanks,
Ben

Thanks
/kmk

On 3/13/07, *Muthu Kumar* <km7kumar@xxxxxxxxx 

<mailto:km7kumar@xxxxxxxxx>> wrote:

    'm trying to enable VLAN in my eth driver. The eth mac supports
    vlan processing and has a register (vlantag1) that should be written
    with 0x8100 to enable VLAN processing. Other than this, the mac does
    not have any other vlan related registers or anything else. It does
    not give
    any indication during rx if VLAN pkts received.

    How do I enable VLAN in my driver for such a MAC? I'm basically
    confused with all the callbacks such as vlan_rx_register etc most
    drivers support.

    Currently, in my driver I've enabled the features NETIF_VLAN_HW_TX/RX
    and providing the above callbacks. But I'm not sure whether these flags
    are applicable to my driver.

    what else I need to do? I'm kinda stuck here. Any help would be highly
    appreciated.

    thx

    /kmk 

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Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc  http://www.candelatech.com

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