Re: [dpdk-dev] [PATCH] net/failsafe: fix source port ID in Rx packets

[Adrien Mazarguil <adrien.mazarguil@6wind.com>]

On Thu, Apr 18, 2019 at 03:42:24PM +0100, Ferruh Yigit wrote:
> On 4/18/2019 2:11 PM, Adrien Mazarguil wrote:
> > When passed to the application, Rx packets retain the port ID value
> > originally set by slave devices. Unfortunately these IDs have no meaning to
> > applications, which are typically unaware of their existence.
> > 
> > This confuses those caring about the source port field in mbufs (m->port)
> > which experience issues ranging from traffic drop to crashes.
> > 
> > Fixes: a46f8d584eb8 ("net/failsafe: add fail-safe PMD")
> > Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
> > ---
> >  drivers/net/failsafe/failsafe_rxtx.c | 21 +++++++++++++++++++++
> >  1 file changed, 21 insertions(+)
> > 
> > diff --git a/drivers/net/failsafe/failsafe_rxtx.c b/drivers/net/failsafe/failsafe_rxtx.c
> > index 231c83291..e78624127 100644
> > --- a/drivers/net/failsafe/failsafe_rxtx.c
> > +++ b/drivers/net/failsafe/failsafe_rxtx.c
> > @@ -61,6 +61,21 @@ failsafe_set_burst_fn(struct rte_eth_dev *dev, int force_safe)
> >  	rte_wmb();
> >  }
> >  
> > +/*
> > + * Override source port in Rx packets.
> > + *
> > + * Make Rx packets originate from this PMD instance instead of one of its
> > + * slaves. This is mandatory to avoid breaking applications.
> > + */
> > +static void
> > +failsafe_rx_set_port(struct rte_mbuf **rx_pkts, uint16_t nb_pkts, uint16_t port)
> > +{
> > +	unsigned int i;
> > +
> > +	for (i = 0; i != nb_pkts; ++i)
> > +		rx_pkts[i]->port = port;
> > +}
> > +
> >  uint16_t
> >  failsafe_rx_burst(void *queue,
> >  		  struct rte_mbuf **rx_pkts,
> > @@ -87,6 +102,9 @@ failsafe_rx_burst(void *queue,
> >  		sdev = sdev->next;
> >  	} while (nb_rx == 0 && sdev != rxq->sdev);
> >  	rxq->sdev = sdev;
> > +	if (nb_rx)
> > +		failsafe_rx_set_port(rx_pkts, nb_rx,
> > +				     rxq->priv->dev->data->port_id);
> 
> error: struct "fs_priv" has no field "dev"
> 
> I guess intention is: "rxq->priv->data->port_id"

Indeed, I validated this patch as is against v18.11 and overlooked a
compilation check against master. I'll send an updated version with
Cc stable and all, thanks!

-- 
Adrien Mazarguil
6WIND