[net] soc: fsl: dpio: properly compute the consumer index

Mask the consumer index before using it. Without this, we would be
writing frame descriptors beyond the ring size supported by the QBMAN
block.

Fixes: 3b2abda7d28c ("soc: fsl: dpio: Replace QMAN array mode with ring mode enqueue")
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
---

I am sending this fix through the net tree since the bug manifests
itself only on net-next and not the soc trees. This way it would be
easier to integrate this sooner rather than later.

 drivers/soc/fsl/dpio/qbman-portal.c | 1 +
 1 file changed, 1 insertion(+)

> -----Original Message-----
> From: Ioana Ciornei <ioana.ciornei@nxp.com>
> Sent: Tuesday, May 5, 2020 3:14 PM
> To: davem@davemloft.net; netdev@vger.kernel.org; linux-
> kernel@vger.kernel.org
> Cc: Youri Querry <youri.querry_1@nxp.com>; Leo Li <leoyang.li@nxp.com>;
> Ioana Ciornei <ioana.ciornei@nxp.com>
> Subject: [PATCH net] soc: fsl: dpio: properly compute the consumer index
> 
> Mask the consumer index before using it. Without this, we would be writing
> frame descriptors beyond the ring size supported by the QBMAN block.
> 
> Fixes: 3b2abda7d28c ("soc: fsl: dpio: Replace QMAN array mode with ring
> mode enqueue")
> Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>

If you would like it go through net tree.

Acked-by: Li Yang <leoyang.li@nxp.com>

> ---
> 
> I am sending this fix through the net tree since the bug manifests itself only
> on net-next and not the soc trees. This way it would be easier to integrate
> this sooner rather than later.

Since the description of the patch says it fixes a patch included from soc tree, it is not very clear why this problem only exists on net-next.

> 
>  drivers/soc/fsl/dpio/qbman-portal.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/soc/fsl/dpio/qbman-portal.c
> b/drivers/soc/fsl/dpio/qbman-portal.c
> index 804b8ba9bf5c..23a1377971f4 100644
> --- a/drivers/soc/fsl/dpio/qbman-portal.c
> +++ b/drivers/soc/fsl/dpio/qbman-portal.c
> @@ -669,6 +669,7 @@ int qbman_swp_enqueue_multiple_direct(struct
> qbman_swp *s,
>  		eqcr_ci = s->eqcr.ci;
>  		p = s->addr_cena + QBMAN_CENA_SWP_EQCR_CI;
>  		s->eqcr.ci = qbman_read_register(s,
> QBMAN_CINH_SWP_EQCR_CI);
> +		s->eqcr.ci &= full_mask;
> 
>  		s->eqcr.available = qm_cyc_diff(s->eqcr.pi_ring_size,
>  					eqcr_ci, s->eqcr.ci);
> --
> 2.17.1

> Subject: RE: [PATCH net] soc: fsl: dpio: properly compute the consumer index
> 
> 
> 
> > -----Original Message-----
> > From: Ioana Ciornei <ioana.ciornei@nxp.com>
> > Sent: Tuesday, May 5, 2020 3:14 PM
> > To: davem@davemloft.net; netdev@vger.kernel.org; linux-
> > kernel@vger.kernel.org
> > Cc: Youri Querry <youri.querry_1@nxp.com>; Leo Li
> > <leoyang.li@nxp.com>; Ioana Ciornei <ioana.ciornei@nxp.com>
> > Subject: [PATCH net] soc: fsl: dpio: properly compute the consumer
> > index
> >
> > Mask the consumer index before using it. Without this, we would be
> > writing frame descriptors beyond the ring size supported by the QBMAN block.
> >
> > Fixes: 3b2abda7d28c ("soc: fsl: dpio: Replace QMAN array mode with
> > ring mode enqueue")
> > Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
> 
> If you would like it go through net tree.
> 
> Acked-by: Li Yang <leoyang.li@nxp.com>
> 
> > ---
> >
> > I am sending this fix through the net tree since the bug manifests
> > itself only on net-next and not the soc trees. This way it would be
> > easier to integrate this sooner rather than later.
> 
> Since the description of the patch says it fixes a patch included from soc tree, it
> is not very clear why this problem only exists on net-next.
> 

The problem is only observed when we enqueue multiple frame descriptors at once, which is happening only with my latest patch set on net-next that adds this for the XDP_REDIRECT path. 

> >
> >  drivers/soc/fsl/dpio/qbman-portal.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/soc/fsl/dpio/qbman-portal.c
> > b/drivers/soc/fsl/dpio/qbman-portal.c
> > index 804b8ba9bf5c..23a1377971f4 100644
> > --- a/drivers/soc/fsl/dpio/qbman-portal.c
> > +++ b/drivers/soc/fsl/dpio/qbman-portal.c
> > @@ -669,6 +669,7 @@ int qbman_swp_enqueue_multiple_direct(struct
> > qbman_swp *s,
> >  		eqcr_ci = s->eqcr.ci;
> >  		p = s->addr_cena + QBMAN_CENA_SWP_EQCR_CI;
> >  		s->eqcr.ci = qbman_read_register(s,
> QBMAN_CINH_SWP_EQCR_CI);
> > +		s->eqcr.ci &= full_mask;
> >
> >  		s->eqcr.available = qm_cyc_diff(s->eqcr.pi_ring_size,
> >  					eqcr_ci, s->eqcr.ci);
> > --
> > 2.17.1

From: Ioana Ciornei <ioana.ciornei@nxp.com>
Date: Tue,  5 May 2020 23:14:29 +0300

> Mask the consumer index before using it. Without this, we would be
> writing frame descriptors beyond the ring size supported by the QBMAN
> block.
> 
> Fixes: 3b2abda7d28c ("soc: fsl: dpio: Replace QMAN array mode with ring mode enqueue")
> Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>

Applied to net-next, thanks.