[dpdk-users] How to configure an Ethernet Driver to ignore the Ethertype

[dpdk-users] How to configure an Ethernet Driver to ignore the Ethertype

[Jim Murphy]

Hi,

I was wondering if there is a way to get the Ethernet driver to ignore the
Ethertype. The problem I am having is that I am dealing with a switch chip
that is redirecting packets to the processor via an offload ethernet
device. Before offload the switch chip adds a header that pushes the DA
into the spot where the EtherType is normally. As a result, the ethertype
is essentially a random value so some packets will look like that have a
snap header and the driver will conclude that the packet is corrupted I
presume. I am working with the IXGBE driver.

Any ideas?

Thanks,

Jim

Re: [dpdk-users] How to configure an Ethernet Driver to ignore the Ethertype

[David Christensen]

> I was wondering if there is a way to get the Ethernet driver to ignore the
> Ethertype. The problem I am having is that I am dealing with a switch chip
> that is redirecting packets to the processor via an offload ethernet
> device. Before offload the switch chip adds a header that pushes the DA
> into the spot where the EtherType is normally. As a result, the ethertype
> is essentially a random value so some packets will look like that have a
> snap header and the driver will conclude that the packet is corrupted I
> presume. I am working with the IXGBE driver.

Are you talking about HiGig/HiGig2 headers? I think your support in the 
DPDK will be limited to octeontx2 (look for switch_header="higig2" in
https://fast.dpdk.org/doc/pdf-guides/nics-master.pdf).

Dave

Re: [dpdk-users] How to configure an Ethernet Driver to ignore the Ethertype

[Jim Murphy]

Hi,

Thanks for the pointers on higig I will look into it. However in this case
these headers are defined arbitrarily using p4.

Thanks,

Jim

On Wed, Feb 26, 2020, 1:58 PM David Christensen <drc@linux.vnet.ibm.com>
wrote:

> > I was wondering if there is a way to get the Ethernet driver to ignore
> the
> > Ethertype. The problem I am having is that I am dealing with a switch
> chip
> > that is redirecting packets to the processor via an offload ethernet
> > device. Before offload the switch chip adds a header that pushes the DA
> > into the spot where the EtherType is normally. As a result, the ethertype
> > is essentially a random value so some packets will look like that have a
> > snap header and the driver will conclude that the packet is corrupted I
> > presume. I am working with the IXGBE driver.
>
> Are you talking about HiGig/HiGig2 headers? I think your support in the
> DPDK will be limited to octeontx2 (look for switch_header="higig2" in
> https://fast.dpdk.org/doc/pdf-guides/nics-master.pdf).
>
> Dave
>