regression: msk0 watchdog timeout and interrupt storm

[Yonghyeon PYUN]

On Tue, Oct 29, 2013 at 05:38:27PM +0400, Boris Samorodov wrote:
> Hi Yonghyeon and All,
> 

Hi,

> >From time to time I use a notebook and boot FreeBSD from USB
> stick. FreeBSD 9.2-i386 works OK. So I tried to use
> FreeBSD 10.0-i386 BETA2 and the network adapter works for
> some 10-15 seconds and then stops with diagnostic message
> "msk0:watchdog timeout". I've found similar case at
> freebsd-current@ with no workaround. Yes, there is an
> interrupt storm as well.

There had been no functional changes for very long time so I'm not
sure what's going on here.  I've attached local change I have at
this moment but I'm afraid it wouldn't address the issue above.

I recall jhb also reported interrupt storm in the past but the root
cause was not identified yet.  Could you change msk_intr() and let
me know which interrupt is firing?
> 
> Here is some additional info:
> -----
> mskc0 at pci0:3:0:0:       class=0x020000 card=0xff501179 chip=0x435511ab
> rev=0x12 hdr=0x00
>     vendor     = 'Marvell Technology Group Ltd.'
>     device     = '88E8040T PCI-E Fast Ethernet Controller'
>     class      = network
>     subclass   = ethernet
>     cap 01[48] = powerspec 3  supports D0 D1 D2 D3  current D0
>     cap 05[5c] = MSI supports 1 message, 64 bit enabled with 1 message
>     cap 10[c0] = PCI-Express 2 legacy endpoint max data 128(128) link x1(x1)
>                  speed 2.5(2.5) ASPM disabled(L0s/L1)
>     ecap 0001[100] = AER 1 0 fatal 0 non-fatal 1 corrected
>     ecap 0003[130] = Serial 1 b8b063ffff681e00
> -----
> 
> -- 
> WBR, Boris Samorodov (bsam)
> FreeBSD Committer, http://www.FreeBSD.org The Power To Serve
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