82574L hangs (with r233708 e1000 driver).

[Konstantin Belousov]

On Sat, Apr 07, 2012 at 03:06:38PM -0700, Jason Wolfe wrote:
> On Sat, Apr 7, 2012 at 6:37 AM, Konstantin Belousov <kostikbel at gmail.com> wrote:
> > I bought Intel Atom motherboard DN2800MT, which has integrated if_em
> > LOM, reported by pciconf as
> > em0 at pci0:1:0:0: class=0x020000 card=0x20128086 chip=0x10d38086 rev=0x00 hdr=0x00
> > 82574L Gigabit Network Connection
> > It seems that any non-trivial network activity on the interface causes
> > reliable interface hang, which can be temporary cured by ifconfig down/up.
> > This happens both with outdated stable/9 sys/dev/e1000 and with driver
> > from HEAD merged into stable/9. I currently use the copy of dev/e1000
> > at rev. r233708. Disabling MSI-X makes the hand to occur slightly less
> > often.
> >
> > I can reproduce the hang in approximately a minute by scp'ing large
> > file from other machine to /dev/null on the DN2800MT. This makes the
> > board completely unusable for me.
> >
> > The driver reports itself as
> > em0: <Intel(R) PRO/1000 Network Connection 7.3.2> port 0x2000-0x201f mem 0xc0400000-0xc041ffff,0xc0000000-0xc03fffff,0xc0420000-0xc0423fff irq 16 at device 0.0 on pci1
> > em0: attempting to allocate 3 MSI-X vectors (5 supported)
> > msi: routing MSI-X IRQ 258 to local APIC 0 vector 60
> > msi: routing MSI-X IRQ 259 to local APIC 0 vector 61
> > msi: routing MSI-X IRQ 260 to local APIC 0 vector 62
> > em0: using IRQs 258-260 for MSI-X
> > em0: Using MSIX interrupts with 3 vectors
> > em0: bpf attached
> > em0: Ethernet address: 00:22:4d:7a:47:f6
> > em0: Link is up 1000 Mbps Full Duplex
> >
> > The board is connected to ProCurve switch, there is no link flaps.
> >
> > When hang occur, dmesg output of # sysctl dev.em.0.debug=1
> > dev.em.0.debug: Interface is RUNNING and ACTIVE
> > em0: hw tdh = 357, hw tdt = 357
> > em0: hw rdh = 323, hw rdt = 273
> > em0: Tx Queue Status = 0
> > em0: TX descriptors avail = 1024
> > em0: Tx Descriptors avail failure = 0
> > em0: RX discarded packets = 0
> > em0: RX Next to Check = 274
> > em0: RX Next to Refresh = 273
> >
> > [..snip..]
> > Any help ?
> 
> Konstantin,
> 
> It doesn't appear to be the exact issue I was seeing, but here is a
> patch that did resolve issues with my 82574L buffers filling and
> requiring a down/up to recover.  It was the result of the 'Intel
> 82574L interface wedging - em7.3.2/8.2-STABLE' if you'd like to peruse
> that.
Yes, I (re)read the thread when I first encountered the issue.
The r233708 that I specifically mentioned above should be the commit
of the patch you have attached.

Anyway, thank you for help.
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