netdev - Re: [PATCH net-next] i40e: allow VMDQs to be used with AF

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Date:   Fri, 11 Sep 2020 15:10:27 +0200
From:   Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To:     Magnus Karlsson <magnus.karlsson@...il.com>
Cc:     "Karlsson, Magnus" <magnus.karlsson@...el.com>,
        Björn Töpel <bjorn.topel@...el.com>,
        intel-wired-lan <intel-wired-lan@...ts.osuosl.org>,
        jeffrey.t.kirsher@...el.com,
        Network Development <netdev@...r.kernel.org>,
        Maciej Fijalkowski <maciejromanfijalkowski@...il.com>
Subject: Re: [PATCH net-next] i40e: allow VMDQs to be used with AF_XDP
 zero-copy

On Fri, Sep 11, 2020 at 02:29:50PM +0200, Magnus Karlsson wrote:
> On Fri, Sep 11, 2020 at 2:11 PM Maciej Fijalkowski
> <maciej.fijalkowski@...el.com> wrote:
> >
> > On Fri, Sep 11, 2020 at 02:08:26PM +0200, Magnus Karlsson wrote:
> > > From: Magnus Karlsson <magnus.karlsson@...el.com>
> > >
> > > Allow VMDQs to be used with AF_XDP sockets in zero-copy mode. For some
> > > reason, we only allowed main VSIs to be used with zero-copy, but
> > > there is now reason to not allow VMDQs also.
> >
> > You meant 'to allow' I suppose. And what reason? :)
> 
> Yes, sorry. Should be "not to allow". I was too trigger happy ;-).
> 
> I have gotten requests from users that they want to use VMDQs in
> conjunction with containers. Basically small slices of the i40e
> portioned out as netdevs. Do you see any problems with using a VMDQ
> iwth zero-copy?

No, I only meant to provide the actual reason (what you wrote above) in
the commit message.

> 
> /Magnus
> 
> > >
> > > Signed-off-by: Magnus Karlsson <magnus.karlsson@...el.com>
> > > ---
> > >  drivers/net/ethernet/intel/i40e/i40e_xsk.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
> > > index 2a1153d..ebe15ca 100644
> > > --- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c
> > > +++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
> > > @@ -45,7 +45,7 @@ static int i40e_xsk_pool_enable(struct i40e_vsi *vsi,
> > >       bool if_running;
> > >       int err;
> > >
> > > -     if (vsi->type != I40E_VSI_MAIN)
> > > +     if (!(vsi->type == I40E_VSI_MAIN || vsi->type == I40E_VSI_VMDQ2))
> > >               return -EINVAL;
> > >
> > >       if (qid >= vsi->num_queue_pairs)
> > > --
> > > 2.7.4
> > >