[Intel-wired-lan] i40e error handling LLDP messages from Arista switches

[Parikh, Neerav]

Resending as the original email was sent in HTLM format and hence my reply went in that format
as well; which got rejected by netdev mailer.

> -----Original Message-----
> From: Intel-wired-lan [mailto:intel-wired-lan-bounces at lists.osuosl.org] On Behalf Of Parikh, Neerav
> Sent: Tuesday, April 19, 2016 10:45 AM
> To: Jeremy Ashton <jeremy.ashton at shopify.com>
> Cc: netdev at vger.kernel.org; intel-wired-lan at lists.osuosl.org
> Subject: Re: [Intel-wired-lan] i40e error handling LLDP messages from Arista switches
>
> > From: Intel-wired-lan [mailto:intel-wired-lan-bounces at lists.osuosl.org] On Behalf Of Jeremy Ashton
> > Sent: Tuesday, April 19, 2016 10:26 AM
> > Cc: netdev at vger.kernel.org; intel-wired-lan at lists.osuosl.org
> > Subject: [Intel-wired-lan] i40e error handling LLDP messages from Arista switches
> >
> > I have been trying to get pf_ring with zc running on ubuntu 14.04.  The thread can be found here:
> >
> > https://github.com/ntop/PF_RING/issues/81
> >
> > Unfortunately it seems there is a bug in i40e which is carried into the code base for i40e_zc.
> >
> > $ modinfo i40e
> > filename:       /lib/modules/3.19.0-58-generic/kernel/drivers/net/ethernet/intel/i40e/i40e.ko
> > version:        1.2.2-k
> > license:        GPL
> > description:    Intel(R) Ethernet Connection XL710 Network Driver
> > author:         Intel Corporation, <e1000-devel at lists.sourceforge.net>
> > srcversion:     E3DEEE00F49BBFBB8FF33A7
> > alias:          pci:v00008086d00001586sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001585sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001584sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001583sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001581sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001580sv*sd*bc*sc*i*
> > alias:          pci:v00008086d0000157Fsv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001574sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001572sv*sd*bc*sc*i*
> > depends:        ptp,vxlan
> > intree:         Y
> > vermagic:       3.19.0-58-generic SMP mod_unload modversions
> > signer:         Magrathea: Glacier signing key
> > sig_key:        DE:B3:43:0A:26:E6:7D:3D:3B:54:B9:DD:13:25:B3:3A:46:B2:F2:DD
> > sig_hashalgo:   sha512
> > part:           debug:Debug level (0=none,...,16=all) (int)
> >
> >
> > I wonder if someone might offer some insight as to the next steps to debug/resolve this.
> >
> > Cheers.
> >
> > Can you send us the dmesg output after running i40e debugfs commands 
> > viz. “dump port”, “llpd get local” , “lldp get remote”, for the port that is showing
> > this behavior? Also, do you happen to know what is the Arista side configuration?
> > This will help us debug better.
> >
> > Thanks,
> > Neerav