IGB driver not getting Rx interrupt

[Adam Lackorzynski]

Hi,

On Tue May 01, 2012 at 16:02:53 -0700, Shashi Sharma wrote:
> Here is the log message that shows that Ankh is able to initialize the
> ethernet device (eth1) and assign an IRQ to it.
> 
> ----------------------------------------------------------------------------
> ankh    | opening eth1
> ankh    | <6>device eth1 entered promiscuous mode
> ankh    | set interface to promiscuous mode.
> ankh    | Thread 0xcf for IRQ 40
> io      | (noname)[0x50200]: bind_irq(40, ...)
> io      | IRQ 40 -> client
> io      | IRQ mode = 300000 -> 6
> io      |   bound irq 40 -> err=0
> ankh    | Opened 3 network devices.
> ankh    | lo    IRQ: 0x00  MAC: 00:00:00:00:00:00  MTU: 16436
> ankh    | eth0  IRQ: 0x00  MAC: 00:E0:81:C4:76:07  MTU:  1500
> ankh    | eth1  IRQ: 0x00  MAC: 00:E0:81:C4:76:06  MTU:  1500
> --------------------------------------------------------------------------------------------------
> 
> As per your suggestion I looked it up in the "Shift-Q" list and I see
> the IRQ  is properly connected to the proper Thread.
> 
> --------------------------------------------------------------------------------------------------
>       d1 ffd073d4 [IRQ    ] I= 28 HW IRQ (DIRQ) L=28 T=cf F=7 Q=0
> --------------------------------------------------------------------------------------------------
> 
> Using the "List IRQ Threads: R" in JDB I get the following result
> 
> ----------------------------------------------------------------------------
> jdb: R [l]ist/[a]ttach: l
> IRQ 04/04
> IRQ 28/40
> IRQ 29/41
> -----------------------------------------------------------------------------
> 
> Which shows that the IRQ is attached to the thread.
> 
> But still, The IGB's Interrupt Service Routine (ISR) never gets
> invoked. 

That looks quite ok to me. What you can check is whether the driver
thinks it should use MSI type interrupts, and if yes, force it to legacy
mode and see if it changes its behavior.


Adam
-- 
Adam                 adam at os.inf.tu-dresden.de
  Lackorzynski         http://os.inf.tu-dresden.de/~adam/