linux-kernel - RE: [PATCH 13/13] dpaa_eth: fix SG frame cleanup

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Message-ID: <DB7PR04MB513254918C98E96E2E61E22CEC550@DB7PR04MB5132.eurprd04.prod.outlook.com>
Date:   Mon, 1 Apr 2019 10:41:56 +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 13/13] dpaa_eth: fix SG frame cleanup

Hi Joakim,

> -----Original Message-----
> From: Joakim Tjernlund [mailto:Joakim.Tjernlund@...inera.com]
> Sent: Friday, March 29, 2019 5:25 PM> 
> 
> Should this one go stable 4.14/4.19 too?

Good point. I also think it makes sense to cc: stable.

---
Best Regards, Laurentiu

> On Fri, 2019-03-29 at 16:00 +0200, 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>
> > ---
> >  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
> >