netdev - Re: [PATCH 13/13] dpaa_eth: fix SG frame cleanup

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Date:   Fri, 29 Mar 2019 15:25:22 +0000
From:   Joakim Tjernlund <Joakim.Tjernlund@...inera.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "madalin.bucur@....com" <madalin.bucur@....com>,
        "leoyang.li@....com" <leoyang.li@....com>,
        "laurentiu.tudor@....com" <laurentiu.tudor@....com>,
        "roy.pledge@....com" <roy.pledge@....com>,
        "camelia.groza@....com" <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


Should this one go stable 4.14/4.19 too?

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
>