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

[Jiawei(Jonny) Wang]

> -----Original Message-----
> From: Thomas Monjalon <thomas at monjalon.net>
> Sent: Friday, July 23, 2021 10:10 PM
> To: Slava Ovsiienko <viacheslavo at nvidia.com>; Jiawei(Jonny) Wang
> <jiaweiw at nvidia.com>
> Cc: Matan Azrad <matan at nvidia.com>; Ori Kam <orika at nvidia.com>;
> Shahaf Shuler <shahafs at nvidia.com>; dev at dpdk.org; Raslan Darawsheh
> <rasland at nvidia.com>; stable at dpdk.org
> Subject: Re: [PATCH] net/mlx5: fix mirror flow split with L3 encapsulation
> 
> 23/07/2021 16:01, Jiawei(Jonny) Wang:
> > Hello,
> >
> > From: Thomas Monjalon <thomas at monjalon.net>
> > > 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;
> 
> OK please be more explicit in the next version.
> 

The v2 patch is ready, https://patchwork.dpdk.org/project/dpdk/patch/20210726062233.30657-1-jiaweiw@nvidia.com/
Please help to review, and Thanks your comments.

> > > > 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 at dpdk.org
> > > >
> > > > Signed-off-by: Jiawei Wang <jiaweiw at nvidia.com>
> > > > Acked-by: Viacheslav Ovsiienko <viacheslavo at nvidia.com>
> 
>