IGB driver not getting Rx interrupt

[Julian Stecklina]

On Sun, 2012-05-13 at 23:53 +0200, Adam Lackorzynski wrote: 
> Hi,
> 
> On Thu May 10, 2012 at 15:14:47 -0700, Shashi Sharma wrote:
> > I am pretty sure now that Fiasco's ISR is not getting invoked. I put a
> > printf in the following interrupt handler in fiasco's
> > src/kern/ia32/dirq-ia32-ux.cpp.
> > 
> > ----
> > extern "C" FIASCO_FASTCALL
> > void
> > irq_interrupt(Mword _irqobj, Mword ip)
> > ----------
> > 
> > And it never gets invoked.
> 
> Ok.
> 
> > You suggested in your last e-mail to "check whether the card is
> > reporting a pending interrupt". But I dont really know how to do that.
> > Is there some way in JDB to do that?
> 
> Usually a device has a device register that indicates whether an
> interrupt has been asserted. So in JDB you could look up the this
> register, or add some printf in the driver or so to see if its contents
> change after some packet transfer should have happened.

For IGB that register would be called ICR or EICR (interrupt cause
register). Hope that helps finding it in the source.

Julian