[dpdk-users] RSS RETA size of 0 on vmxnet3?

[dpdk-users] RSS RETA size of 0 on vmxnet3?

[Rob Zimmerman]

Happy Friday, everyone!

Testing within VMWARE and my device query is showing the following:

RSS Offload
 - reta size: 0
 - IPv4: yes
    - TCP: yes
    - UDP: no
    - SCTP: no
 - IPv6: yes
....

How exactly does RSS work with a table size of zero? Unless I'm completely
misunderstanding how to use RSS, I thought the redirection table was
instrumental to that process...

FWIW, I'm running the same code on a bare-metal box with Intel I350's
(igb_pmd) and it's showing a RETA size of 128, so I don't think it's my
code showing a junk value.

Thanks!
Rob

Re: [dpdk-users] RSS RETA size of 0 on vmxnet3?

[Stephen Hemminger]

On Fri, 27 Jan 2017 14:53:22 -0500
Rob Zimmerman <rob@thezims.net> wrote:

> Happy Friday, everyone!
> 
> Testing within VMWARE and my device query is showing the following:
> 
> RSS Offload
>  - reta size: 0
>  - IPv4: yes
>     - TCP: yes
>     - UDP: no
>     - SCTP: no
>  - IPv6: yes
> ....
> 
> How exactly does RSS work with a table size of zero? Unless I'm completely
> misunderstanding how to use RSS, I thought the redirection table was
> instrumental to that process...
> 
> FWIW, I'm running the same code on a bare-metal box with Intel I350's
> (igb_pmd) and it's showing a RETA size of 128, so I don't think it's my
> code showing a junk value.
> 
> Thanks!
> Rob

If you are querying a KNI interface (ie through Linux), it just means
the KNI interface doesn't do the ethtool support that value.

Re: [dpdk-users] RSS RETA size of 0 on vmxnet3?

[Rob Zimmerman]

Thanks for the reply, @networkplumber  :)

No KNI interface here, unfortunately. Just a plain-ol DPDK ethernet device.


In the scenario where the RETA size is 0 I'm using the vmxnet3_pmd. Within
the application the eth devices are initialized and I make a call to
rte_eth_dev_info_get().

What is everyone else seeing for the RETA size using vmxnet3?

Thanks again everyone,
~Rob




On Fri, Jan 27, 2017 at 5:03 PM, Stephen Hemminger <
stephen@networkplumber.org> wrote:

> On Fri, 27 Jan 2017 14:53:22 -0500
> Rob Zimmerman <rob@thezims.net> wrote:
>
> > Happy Friday, everyone!
> >
> > Testing within VMWARE and my device query is showing the following:
> >
> > RSS Offload
> >  - reta size: 0
> >  - IPv4: yes
> >     - TCP: yes
> >     - UDP: no
> >     - SCTP: no
> >  - IPv6: yes
> > ....
> >
> > How exactly does RSS work with a table size of zero? Unless I'm
> completely
> > misunderstanding how to use RSS, I thought the redirection table was
> > instrumental to that process...
> >
> > FWIW, I'm running the same code on a bare-metal box with Intel I350's
> > (igb_pmd) and it's showing a RETA size of 128, so I don't think it's my
> > code showing a junk value.
> >
> > Thanks!
> > Rob
>
> If you are querying a KNI interface (ie through Linux), it just means
> the KNI interface doesn't do the ethtool support that value.
>

Re: [dpdk-users] RSS RETA size of 0 on vmxnet3?

[Stephen Hemminger]

On Fri, 27 Jan 2017 18:21:10 -0500
Rob Zimmerman <rob@thezims.net> wrote:

> Thanks for the reply, @networkplumber  :)
> 
> No KNI interface here, unfortunately. Just a plain-ol DPDK ethernet device.
> 
> 
> In the scenario where the RETA size is 0 I'm using the vmxnet3_pmd. Within
> the application the eth devices are initialized and I make a call to
> rte_eth_dev_info_get().
> 
> What is everyone else seeing for the RETA size using vmxnet3?
> 
> Thanks again everyone,
> ~Rob

It is a vmxnet3 missing feature. The VMXNET3 protocol has ability to get/set RSS table
but the VMXNET3 driver in DPDK (originally by Intel) is missing that feature. Would not
be hard to write, just look at Linux for protocol.