Re: [dpdk-stable] [PATCH] net/mlx5: fix mirror flow split with L3 encapsulation

["Jiawei(Jonny) Wang" <jiaweiw@nvidia.com>]

Hello, 

> -----Original Message-----
> From: Thomas Monjalon <thomas@monjalon.net>
> Sent: Friday, July 23, 2021 8:57 PM
> To: Slava Ovsiienko <viacheslavo@nvidia.com>; Jiawei(Jonny) Wang
> <jiaweiw@nvidia.com>
> Cc: Matan Azrad <matan@nvidia.com>; Ori Kam <orika@nvidia.com>;
> Shahaf Shuler <shahafs@nvidia.com>; dev@dpdk.org; Raslan Darawsheh
> <rasland@nvidia.com>; stable@dpdk.org
> Subject: Re: [PATCH] net/mlx5: fix mirror flow split with L3 encapsulation
> 
> 23/07/2021 14:43, Jiawei Wang:
> > Due to hardware limitations, the decap action can't follow the
> 
> Which decap action? Pleas be more specific.

All of decap,  vxlan_decap, nvgre_decap and raw_decap.
Will update details.

> 
> > sample action in the same flow, to keep the original action order of
> > sample and decap actions the flow was internally split by PMD, and
> > decap action was moved into suffix subflow in the new table.
> 
> "the" new table? which one?

" sample and decap actions the flow was internally split by PMD, " means
that PMD split internally into two flows:prefix subflow with sample action in original table;
suffix subflow with decap action in the new table;

> 
> Was there an issue? Above seems to say all is fine.
> 

The issue is mentioned below that 'L3 encapsulation' case (raw_decap+raw_encap), 
the previous code not consier the combination decap/encap case.
And under this case flow don't need split.

> > There is a specific combination of raw decap and raw encap actions to
> > specify "L3 encapsulation" packet transformation - raw decap action to
> > remove L2 header and raw encap to add the tunnel header.
> 
> Is this combination the problem? It was not working before this patch?
> Please describe what happened.
> 

L3 encap is working without sample action or sample is working without L3 encap;

> > This specific L3 encapsulation is encoded as a single packet reformat
> > hardware transaction and is supported by hardware after sample action
> > (no hardware limitations for packet reformat).
> >
> > The patch checks whether the decap action is the part of "L3
> encapsulation"
> 
> I think you mean "is part of".

Thanks, will fix in new version.

> 
> > and does not move the decap action into suffix subflow for the case.
> >
> > Fixes: cafd87f62a06 ("net/mlx5: fix VLAN push/pop and decap actions
> > with mirror")
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Jiawei Wang <jiaweiw@nvidia.com>
> > Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
> 
> 

Thanks.