[dpdk-dev] [PATCH] doc: announce ixgbe MTU setting limitation

Lu, Wenzhuo wenzhuo.lu at intel.com
Thu Feb 9 01:40:20 CET 2017


Hi Ferruh,


> -----Original Message-----
> From: Yigit, Ferruh
> Sent: Thursday, February 9, 2017 12:12 AM
> To: Lu, Wenzhuo; dev at dpdk.org
> Subject: Re: [dpdk-dev] [PATCH] doc: announce ixgbe MTU setting limitation
> 
> On 2/7/2017 6:22 AM, Wenzhuo Lu wrote:
> > Signed-off-by: Wenzhuo Lu <wenzhuo.lu at intel.com>
> > ---
> >  doc/guides/nics/ixgbe.rst | 16 ++++++++++++++--
> >  1 file changed, 14 insertions(+), 2 deletions(-)
> >
> > diff --git a/doc/guides/nics/ixgbe.rst b/doc/guides/nics/ixgbe.rst
> > index 3b6851b..1f7d6b3 100644
> > --- a/doc/guides/nics/ixgbe.rst
> > +++ b/doc/guides/nics/ixgbe.rst
> > @@ -185,8 +185,11 @@ As in the case of l3fwd, set configure
> > port_conf.rxmode.hw_ip_checksum=0 to enab  In addition, for improved
> performance, use -bsz "(32,32),(64,64),(32,32)" in load_balancer to avoid using
> the default burst size of 144.
> >
> >
> > +Limitations or Known issues
> > +---------------------------
> > +
> >  Malicious Driver Detection not Supported
> > -----------------------------------------
> > +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> This looks like the initial intention, thanks.
> 
> Also there are a few similar issues in the document:
> 
> 1) "Feature not Supported by RX Vector PMD" is under "TX Constraint".
> 
> 2) "Application Programming Interface" and "Sample Application Notes"
> are under "Vector PMD for IXGBE"
> 
> Not sure if above are the intention.
> 
> What do you think converting this patch into a patchset, first patch fixes
> headlines you already fixed and above ones if required.
> 
> And second patch is just to add "MTU setting" limitation note?
Thanks for your suggestion. I'll split this patch.

> 
> Thanks,
> ferruh
> 
> >
> >  The Intel x550 series NICs support a feature called MDD (Malicious
> > Driver Detection) which checks the behavior of the VF driver.
> > @@ -207,7 +210,7 @@ it by default.)
> >
> >
> >  Statistics
> > -----------
> > +~~~~~~~~~~
> >
> >  The statistics of ixgbe hardware must be polled regularly in order
> > for it to  remain consistent. Running a DPDK application without
> > polling the statistics will @@ -230,6 +233,15 @@ be calculated as follows:
> >
> >  In order to ensure valid results, it is recommended to poll every 4 minutes.
> >
> > +MTU setting
> > +~~~~~~~~~~~
> > +
> > +Although user can set MTU separately on PF and VF ports, ixgbe only
> > +supports one global MTU per physical port.
> > +So when user sets different MTUs on PF and VF ports in one physical
> > +port, the real MTU for all these PF and VF ports is the biggest one.
> > +This behavior is leveraged from kernel driver.
> > +
> >
> >  Supported Chipsets and NICs
> >  ---------------------------
> >



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