MAX_MBUF_SIZE causes queue configuration failure.

[Dhamodaran Pandiyan]

Hi Beilei,

We're using,
0000:5e:00.0 'Ethernet Controller X710 for 10GbE SFP+ 1572' drv=vfio-pci
unused=i40e
0000:5e:00.1 'Ethernet Controller X710 for 10GbE SFP+ 1572' drv=vfio-pci
unused=i40e

DPDK_VERSION=20.11

Please let me know if you need any other information.

Thanks,
Dhamodaran P

On Wed, 12 Apr 2023 at 18:24, Xing, Beilei <beilei.xing at intel.com> wrote:

> Hi,
>
> Which DPDK version did you use?
> As i40evf PMD has been deprecated for long time.
>
> BR,
> Beilei
>
> > -----Original Message-----
> > From: David Marchand <david.marchand at redhat.com>
> > Sent: Wednesday, April 12, 2023 3:28 PM
> > To: Dhamodaran Pandiyan <dhamodaran.it15 at gmail.com>; Xing, Beilei
> > <beilei.xing at intel.com>; Jeff Guo <jia.guo at intel.com>
> > Cc: users at dpdk.org
> > Subject: Re: MAX_MBUF_SIZE causes queue configuration failure.
> >
> > Hello,
> >
> > On Wed, Apr 12, 2023 at 8:59 AM Dhamodaran Pandiyan
> > <dhamodaran.it15 at gmail.com> wrote:
> > >
> > > When I set the value to MAX_MBUF_SIZE as less than 16256, all the
> > initialization went through fine and the application was online.
> > >
> > > But when I increase the MAX_MBUF_SIZE to more than 16256 like 16257,
> > 17000, or 18000, I get the attached log error which shows an issue in
> > configuring the virtual queues for the NIC.
> > >
> > > Log Snip:
> > > i40evf_configure_vsi_queues(): Failed to execute command of
> > > VIRTCHNL_OP_CONFIG_VSI_QUEUES
> > > i40evf_dev_start(): configure queues failed
> >
> > Added net/i40e driver maintainers.
> >
> > This error indicates a failure either when sending a message to the PF
> driver, or
> > that the PF driver refused to configure this VF with the passed
> parameters.
> > Assuming you are using the PF i40e driver, I tracked this message
> handling to
> > find that buffer size is limited (the exact limit is not clear to me)
> probably due
> > to some hw limitations.
> >
> > See:
> >
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/
> > net/ethernet/intel/i40e/i40e_virtchnl_pf.c#n4088
> >
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/
> > net/ethernet/intel/i40e/i40e_virtchnl_pf.c#n2371
> >
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/
> > net/ethernet/intel/i40e/i40e_virtchnl_pf.c#n714
> >
> > /* max pkt. length validation */
> > if (info->max_pkt_size >= (16 * 1024) || info->max_pkt_size < 64) {
> >     ret = -EINVAL;
> >     goto error_param;
> > }
> >
> > I'll let net/i40e reply with better details/explanations.
> >
> >
> > > MTU size for port id:  is: 9000
> > > Failed to start the fast pkt for port_id : 1Ret: -1
> > >
> > > Some Observations:
> > > 1. Thought memory availability was an issue, so provided 10x more
> memory
> > and allocated 10x huge pages than required, still noticed the same issue.
> > > 2. Got to know MTU size also plays a role in deciding the mbuf_size,
> so tried
> > running app with MTU of less value, but still issue persists.
> > >
> > > Please someone enlighten me on what is happening here.
> >
> >
> >
> > --
> > David Marchand
>
>
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