network Driver interface to the stack

[V l <vloveuvm@xxxxxxxxx>]

I studied through my network interface driver and gained sufficient understanding of the network stack. 
I have a network stack for my ARM device and now in stage of interfacing this stack to my network driver in the ARMDevice . 

I know now that I have to just replace 

for(q = p; q != NULL; q = q->next) {
    /* Send the data from the pbuf to the interface, one pbuf at a
       time. The size of the data in each pbuf is kept in the ->len

       variable. */
    send data from(q->payload, q->len);
  }


send
 data from(q->payload, q->len); with my driver specific code to 
send the packet . Very nice ! But when I compile this code , its going 
to ask where this driver specific senddata is defined , the header file 
or library . 
How do I resolve this part of the riddle . Its a little newbie kind of question . But I have tried , I give up now. Plz help.
Regards
Sraddha
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