TSO, SMP and the em driver.

[Andre Oppermann]

Ian FREISLICH wrote:
> Hi
> 
> I've noticed that after an apparently random period of time something
> goes wierd with my networking.  A tcpdump shows traffic is recieved,
> but trussing a daemon (sshd for instance) shows the packets are not
> making it that far.  Also, no packets are transmitted either.
> 
> Here's an ifconfig of the interface while it doesn't transmit or
> recieve packets, note the OACTIVE:

OACTIVE means the interface is stuck.  This looks like a bug in the
em(4) driver.  I've copied Jack Vogel, the driver maintainer from Intel,
into this email.

-- 
Andre

> em0: flags=8c43<UP,BROADCAST,RUNNING,OACTIVE,SIMPLEX,MULTICAST> mtu 1500
>         options=3cb<RXCSUM,TXCSUM,VLAN_MTU,POLLING,VLAN_HWCSUM,TSO4,TSO6>
>         inet 41.204.193.40 netmask 0xfffffff0 broadcast 41.204.193.47
>         ether 00:04:23:d4:12:2e
>         media: Ethernet autoselect (100baseTX <full-duplex>)
>         status: active
> 
> If I disable and re-enable TSO, the interface cames back, but
> probably because of an interface reset.  It comes back without the
> OACTIVE flag and then all works well for some time.
> 
> Here's the pciconf output for the ethernet device.
> 
> em0 at pci3:4:0:   class=0x020000 card=0x10798086 chip=0x10798086 rev=0x03 hdr=0x00
>     vendor   = 'Intel Corporation'
>     device   = '82546EB Dual Port Gigabit Ethernet Controller'
>     class    = network
>     subclass = ethernet
> 
> So far, it hasn't happened again with TSO disabled over a period
> where it happened twice.  Let me know if there's any debugging I
> can do for you.  Interestingly, I have 4 more of these dual NICs
> running on the same version of the source without ony problems, but
> the working cards are on UP machines.
> 
> Ian
> 
> --
> Ian Freislich
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