em(4) stops forwarding

[Scott Long]

Michal Mertl wrote:
> Hello,
> 
> I've been running CURRENT for long time and never experienced problem
> with the built-in em(4) card before. Recently (I first noticed it on Jan
> 24) the card has stopped working several times. Nothing gets into the
> log file. Carrier is still detected properly but no data is exchanged.
> Ifconfig up/down doesn't help but kldunload/load does. When I run
> tcpdump I don't see any packet coming in but I see some outgoing.
> 
> Can someone suggest what to look at when it happens the next time? I
> have DDB compiled in. I will try to sniff the wire using another machine
> next time to see if the card sends out anything.
> 
> The command 'pciconf -lv' says about the card this:
> em0 at pci2:1:0:   class=0x020000 card=0x05491014 chip=0x101e8086 rev=0x03
> hdr=0x00
>     vendor   = 'Intel Corporation'
>     device   = '82540EP Gigabit Ethernet Controller (Mobile)'
>     class    = network
>     subclass = ethernet
> 
> The dmesg:
> em0: <Intel(R) PRO/1000 Network Connection Version - 3.2.18> port
> 0x8000-0x803f mem 0xc0220000-0xc023ffff,0xc0200000-0xc020ffff irq 11 at
> device 1.0 on pci2
> em0: Ethernet address: 00:0d:60:cd:ae:e2
> em0: [FAST]
> 
> The interrupt is shared since the machine is a notebook. I don't know if
> it was just a coincidence but I think that it happened at the same time
> as my USB mouse stopped working - the USB controller is on the same irq.
> 
> Michal
> 

What is sharing the interrupt?

Scott