netdev - Re: commit-3ac72b7b63d5 breaks networking on iMX28

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Date:   Fri, 21 Oct 2016 13:09:39 +0200
From:   Henri Roosen <henri.roosen@...zinger.com>
To:     Fabio Estevam <festevam@...il.com>
CC:     Eric Nelson <eric@...int.com>, Fugang Duan <fugang.duan@....com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: commit-3ac72b7b63d5 breaks networking on iMX28

Hi Fabio,

On 10/21/2016 12:55 PM, Fabio Estevam wrote:
> Hi Henri,
>
> 2016-10-21 7:19 GMT-02:00 Henri Roosen <henri.roosen@...zinger.com>:
>> Hi,
>>
>> Unfortunately commit-3ac72b7b63d5 "net: fec: align IP header in
>> hardware" breaks networking on an iMX28 system.
>>
>> The commit seems valid for iMX6, where it is tested okay and solves the
>> unaligned accesses.
>>
>> On iMX28 I still see unaligned accesses and networking is broken. Can
>> anyone confirm this?
>
> Does this fix the problem?

Yes, this fixes the problem.
Note: only tested on iMX28.

Thanks,
Henri
>
> diff --git a/drivers/net/ethernet/freescale/fec_main.c
> b/drivers/net/ethernet/freescale/fec_main.c
> index 4ce8179..d1cefe1 100644
> --- a/drivers/net/ethernet/freescale/fec_main.c
> +++ b/drivers/net/ethernet/freescale/fec_main.c
> @@ -1430,14 +1430,15 @@ fec_enet_rx_queue(struct net_device *ndev, int
> budget, u16 queue_id)
>                 skb_put(skb, pkt_len - 4);
>                 data = skb->data;
>
> +               if (!is_copybreak && need_swap)
> +                       swap_buffer(data, pkt_len);
> +
> +
>  #if !defined(CONFIG_M5272)
>                 if (fep->quirks & FEC_QUIRK_HAS_RACC)
>                         data = skb_pull_inline(skb, 2);
>  #endif
>
> -               if (!is_copybreak && need_swap)
> -                       swap_buffer(data, pkt_len);
> -
>                 /* Extract the enhanced buffer descriptor */
>                 ebdp = NULL;
>                 if (fep->bufdesc_ex)
>

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