Re: [zd1211-devs] Question - Dropping of Packets with CRC Errors

[Clifton Watson]

The driver doesn't need to compute the CRC again.  I just wanted to
know if the firmware is passing the corrupted packets to the driver
(letting it drop the packets) instead of dropping them itself.

--clw

On 8/1/06, Ulrich Kunitz <[EMAIL PROTECTED]> wrote:
> On 06-07-31 21:43 Clifton Watson wrote:
>
> > Ulrich,
> >
> > In other words, you are saying that the device driver drops the
> > corrupted packets based on the value of an error flag?
> >
> > --clw
>
> Yes, just look at zd1205_validate_frame() in the vendor driver.
> We are doing it in zd1211rw in fill_rx_stats(). Why should the
> driver compute the CRC again, if the device is doing that already?
>
> --
> Uli Kunitz
>


-- 
**
Clifton L. Watson, Ph.D. Candidate
Michigan State University
Department of Electrical and Computer Engineering
Wireless and Video Communications Laboratory
3214 Engineering Building
East Lansing, MI 48824

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Re: [zd1211-devs] Question - Dropping of Packets with CRC Errors

[Ulrich Kunitz]

On 06-07-31 21:43 Clifton Watson wrote:

> Ulrich,
> 
> In other words, you are saying that the device driver drops the
> corrupted packets based on the value of an error flag?
> 
> --clw

Yes, just look at zd1205_validate_frame() in the vendor driver.
We are doing it in zd1211rw in fill_rx_stats(). Why should the
driver compute the CRC again, if the device is doing that already?

-- 
Uli Kunitz

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Re: [zd1211-devs] Question - Dropping of Packets with CRC Errors

[Clifton Watson]

Ulrich,

In other words, you are saying that the device driver drops the
corrupted packets based on the value of an error flag?

--clw

On 7/31/06, Ulrich Kunitz <[EMAIL PROTECTED]> wrote:
> On 06-07-31 02:56 Clifton Watson wrote:
>
> > Hi guys,
> >
> > I have a question regarding the ZyDAS ZD1211 driver.  Are the packets
> > containing CRC errors dropped by the firmware or driver?  I would
> > greatly appreciate your help.  Thanks.
>
> The CRC is computed on the device, but the packet is sent to the
> host with the error flag set and is then dropped, but this gives
> the host the possibility to update its statistics and change
> parameters. I'm not aware of any way to switch the behaviour off.
>
> --
> Uli Kunitz
>
> -
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-- 
**
Clifton L. Watson, Ph.D. Candidate
Michigan State University
Department of Electrical and Computer Engineering
Wireless and Video Communications Laboratory
3214 Engineering Building
East Lansing, MI 48824

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Re: [zd1211-devs] Question - Dropping of Packets with CRC Errors

[Ulrich Kunitz]

On 06-07-31 02:56 Clifton Watson wrote:

> Hi guys,
> 
> I have a question regarding the ZyDAS ZD1211 driver.  Are the packets
> containing CRC errors dropped by the firmware or driver?  I would
> greatly appreciate your help.  Thanks.

The CRC is computed on the device, but the packet is sent to the
host with the error flag set and is then dropped, but this gives
the host the possibility to update its statistics and change
parameters. I'm not aware of any way to switch the behaviour off. 

-- 
Uli Kunitz

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[zd1211-devs] Question - Dropping of Packets with CRC Errors

[Clifton Watson]

Hi guys,

I have a question regarding the ZyDAS ZD1211 driver.  Are the packets
containing CRC errors dropped by the firmware or driver?  I would
greatly appreciate your help.  Thanks.

--clw

-- 
**
Clifton L. Watson, Ph.D. Candidate
Michigan State University
Department of Electrical and Computer Engineering
Wireless and Video Communications Laboratory
3214 Engineering Building
East Lansing, MI 48824

***

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