Hi Yuanhan/Finn
I think we may need to caveat the Fortville nics due to the global mask
limitation; we also discussed this in the dpdk meeting yesterday.
What do you think ?
Thanks Darrell
On 9/20/17, 6:47 AM, "Chandran, Sugesh" <sugesh.chand...@intel.com> wrote:
Regards
_Sugesh
> -----Original Message-----
> From: Darrell Ball [mailto:db...@vmware.com]
> Sent: Thursday, September 14, 2017 6:46 PM
> To: Chandran, Sugesh <sugesh.chand...@intel.com>; Yuanhan Liu
> <y...@fridaylinux.org>
> Cc: Finn Christensen <f...@napatech.com>; d...@openvswitch.org
> Subject: Re: [ovs-dev] [PATCH v2 8/8] netdev-dpdk: set FDIR config
>
>
>
> On 9/14/17, 10:36 AM, "Chandran, Sugesh" <sugesh.chand...@intel.com>
> wrote:
>
>
>
> Regards
> _Sugesh
>
> > -----Original Message-----
> > From: Yuanhan Liu [mailto:y...@fridaylinux.org]
> > Sent: Thursday, September 14, 2017 4:19 AM
> > To: Darrell Ball <db...@vmware.com>
> > Cc: Finn Christensen <f...@napatech.com>; Chandran, Sugesh
> > <sugesh.chand...@intel.com>; d...@openvswitch.org
> > Subject: Re: [ovs-dev] [PATCH v2 8/8] netdev-dpdk: set FDIR config
> >
> > On Wed, Sep 13, 2017 at 01:57:22AM +0000, Darrell Ball wrote:
> > >
> > >
> > > On 9/11/17, 1:14 AM, "ovs-dev-boun...@openvswitch.org on behalf of
> > Finn Christensen" <ovs-dev-boun...@openvswitch.org on behalf of
> > f...@napatech.com> wrote:
> > >
> > > -----Original Message-----
> > > From: ovs-dev-boun...@openvswitch.org [mailto:ovs-dev-
> > boun...@openvswitch.org] On Behalf Of Yuanhan Liu
> > > Sent: 11. september 2017 09:55
> > > To: Chandran, Sugesh <sugesh.chand...@intel.com>
> > > Cc: d...@openvswitch.org
> > > Subject: Re: [ovs-dev] [PATCH v2 8/8] netdev-dpdk: set FDIR
config
> > >
> > > On Mon, Sep 11, 2017 at 07:42:57AM +0000, Chandran, Sugesh
wrote:
> > > >
> > > >
> > > > Regards
> > > > _Sugesh
> > > >
> > > >
> > > > > -----Original Message-----
> > > > > From: ovs-dev-boun...@openvswitch.org [mailto:ovs-dev-
> > > > > boun...@openvswitch.org] On Behalf Of Yuanhan Liu
> > > > > Sent: Tuesday, September 5, 2017 10:23 AM
> > > > > To: d...@openvswitch.org
> > > > > Subject: [ovs-dev] [PATCH v2 8/8] netdev-dpdk: set FDIR
config
> > > > >
> > > > > From: Finn Christensen <f...@napatech.com>
> > > > >
> > > > > The Intel i40e PMD driver requires the fdir mode set to
> > > > > RTE_FDIR_MODE_PERFECT, otherwise, the flow creation would
be
> > failed.
> > > > [Sugesh] this means it doesn't honor the flow masks which
passed
> onto
> > rte_flow_*?
> > >
> > > IIRC, that's what I found after divig the code. It's an issue
reported/fixed
> > by Finn. I also don't have the nic for testing.
> > >
> > > [Finn] Yes, this was needed to make our test setup using an
XL710 work,
> > with the rte_flow implementation.
> > > It's a while ago so I don't exactly remember how we ended up
with this
> > solution. However, we are definitely not
> > > Intel XL710 experts, so there might be other ways to achieve
the
> > rte_flow functionality.
> > > This issue, and problem raised about the overall change in
configuration
> > impact on NICs using this setting (Napatech
> > > does not use it), I think should be reviewed/verified by NIC
vendors
> > using it.
> > >
> > >
> > > [Darrell] We need to confirm the masking in the flow (but from
what I see,
> > it is ignored as Sugesh mentioned),
> > > which would be a significant difference.
> > > I guess we need input from Intel flow director
folks to be sure and
> > check if this can be done otherwise.
> > > What about the 82599 as another example ?
> >
> >
> > I will leave this to Intel folks.
> [Sugesh] From the 82599 datasheet
>
> =======
> The 82599 support two types of filtering modes (static setting by the
> FDIRCTRL.PerfectMatch
> bit):
> * Perfect match filters - The hardware checks a match between the
masked
> fields of
> the received packets and the programmed filters. Masked fields should
be
> programmed as zeros in the filter context. The 82599 support up to 8
K - 2
> perfect
> match filters.
> * Signature filters - The hardware checks a match between a hash-based
> signature of
> the masked fields of the received packet. The 82599 supports up to 32
K - 2
> signature filters.
> * Notation - The Perfect Match fields and Signature field are denoted
as Flow
> ID fields.
> The 82599 supports masking / range for the previously described
fields. These
> masks are
> defined globally for all filters in the FDIR...M register.
> =======
> So my understanding is even if it can support masking, the mask is
global and
> not per flow.
>
> [Darrell] That was my interpretation as well; same across flow director
usages.
>
> Again I will confirm this and provide more details.
>
> [Darrell] One question is – ‘is there some way to enable per flow
masking’ with
> this config ?
[Sugesh] No for Intel NIC. It’s a silicon limitation on Fortville. The mask
is a global config.
> A second request is – ‘is there another option than
> RTE_FDIR_MODE_PERFECT
> or similar’ to use to achieve the result ?
[Sugesh] For Fortville this is the only option that can use for per flow.
>
>
> >
> > --yliu
>
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