linux-kernel - RE: [PATCH v2 9/9] dpaa_eth: fix SG frame cleanup

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Date:   Thu, 2 May 2019 12:58:04 +0000
From:   Laurentiu Tudor <laurentiu.tudor@....com>
To:     "jocke@...inera.com" <joakim.tjernlund@...inera.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Madalin-cristian Bucur <madalin.bucur@....com>,
        Leo Li <leoyang.li@....com>, Roy Pledge <roy.pledge@....com>,
        Camelia Alexandra Groza <camelia.groza@....com>
CC:     "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>
Subject: RE: [PATCH v2 9/9] dpaa_eth: fix SG frame cleanup



> -----Original Message-----
> From: Joakim Tjernlund <Joakim.Tjernlund@...inera.com>
> Sent: Thursday, May 2, 2019 1:37 PM
> 
> On Thu, 2019-05-02 at 09:05 +0000, Laurentiu Tudor wrote:
> > Hi Joakim,
> >
> > > -----Original Message-----
> > > From: Joakim Tjernlund <Joakim.Tjernlund@...inera.com>
> > > Sent: Saturday, April 27, 2019 8:11 PM
> > >
> > > On Sat, 2019-04-27 at 10:10 +0300, laurentiu.tudor@....com wrote:
> > > > From: Laurentiu Tudor <laurentiu.tudor@....com>
> > > >
> > > > Fix issue with the entry indexing in the sg frame cleanup code being
> > > > off-by-1. This problem showed up when doing some basic iperf tests
> and
> > > > manifested in traffic coming to a halt.
> > > >
> > > > Signed-off-by: Laurentiu Tudor <laurentiu.tudor@....com>
> > > > Acked-by: Madalin Bucur <madalin.bucur@....com>
> > >
> > > Wasn't this a stable candidate too?
> >
> > Yes, it is. I forgot to add the cc:stable tag, sorry about that.
> 
> Then this is a bug fix that should go directly to linus/stable.
> 
> I note that
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/log/drivers/net/ethernet/freescale/dpaa?h=linux-4.19.y

Not sure I understand ... I don't see the patch in the link.

> is in 4.19 but not in 4.14 , is it not appropriate for 4.14?

I think it makes sense to go in both stable trees.

---
Best Regards, Laurentiu

> >
> > > > ---
> > > >  drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 2 +-
> > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > >
> > > > diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> > > b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> > > > index daede7272768..40420edc9ce6 100644
> > > > --- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> > > > +++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> > > > @@ -1663,7 +1663,7 @@ static struct sk_buff
> *dpaa_cleanup_tx_fd(const
> > > struct dpaa_priv *priv,
> > > >                                  qm_sg_entry_get_len(&sgt[0]),
> dma_dir);
> > > >
> > > >                 /* remaining pages were mapped with
> skb_frag_dma_map()
> > > */
> > > > -               for (i = 1; i < nr_frags; i++) {
> > > > +               for (i = 1; i <= nr_frags; i++) {
> > > >                         WARN_ON(qm_sg_entry_is_ext(&sgt[i]));
> > > >
> > > >                         dma_unmap_page(dev, qm_sg_addr(&sgt[i]),
> > > > --
> > > > 2.17.1
> > > >