Re: Problem with packet transmission

[vijaykumar v <vij@xxxxxxxxxxxxx>]

Hi all,
      I think the explaination I gave in the previous mail wasnt 
enough. So, I have made a figure to illustrate the situation clearly. 
Please take a look at it and give a suggestion.

This module is very critical for my project. I'm desparately in need of 
a solution, as I have already wasted lot of time on fixing this bug. If 
you get a clue, Pls help.

-Vij

vijaykumar v wrote:

> Hi,
>    I have a problem with packet transmission. I have a virtual network 
> device driver, which drives on back of eth0. The driver, (along with a 
> small packet listener) recieves and sends packets without any problem, 
> asynchronously.
>
> The problem creeps in, when a reply packet is generated. ie., when a 
> packet has to be sent immediately after the arrival of another packet. 
> The reply packet doesnt get transmitted.
>
> This, I suppose is not a problem with my driver, as this packet is 
> queued for transmission for eth0 using "dev_queue_xmit(skb);" , with 
> skb->dev set as eth0 device. ethereal shows that the packet in the 
> eth0 device queue. But, the packet doesnt appear on the wire.
>
> This might be a problem with some spinlock,... in the driver.
>
> Can I call dev_queue_xmit at any time?. (I think timing is the problem.)
>
> any reply would be useful.
>
> Thanks in advance,
> Vij

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