linux-kernel - Re: [PATCH (net.git) 2/3] stmmac: fix PTP support for GMAC4

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Message-ID: <CAJ3bTp7YON-+EiXCY+eaBP6NhtGJTngh2pLaKXdp2YPP1i+C6w@mail.gmail.com>
Date:   Thu, 27 Oct 2016 16:21:23 +0530
From:   Rayagond Kokatanur <rayagond@...avyalabs.com>
To:     Giuseppe CAVALLARO <peppe.cavallaro@...com>
Cc:     netdev <netdev@...r.kernel.org>, alexandre.torgue@...com,
        Richard Cochran <richardcochran@...il.com>,
        linux-kernel@...r.kernel.org, seraphin.bonnaffe@...com
Subject: Re: [PATCH (net.git) 2/3] stmmac: fix PTP support for GMAC4

On Thu, Oct 27, 2016 at 4:02 PM, Giuseppe CAVALLARO
<peppe.cavallaro@...com> wrote:
> Hello Rayagond !
>
> On 10/27/2016 12:25 PM, Rayagond Kokatanur wrote:
>>>
>>> +static int dwmac4_wrback_get_rx_timestamp_status(void *desc, u32 ats)
>>> >  {
>>> >         struct dma_desc *p = (struct dma_desc *)desc;
>>> > +       int ret = -EINVAL;
>>> > +
>>> > +       /* Get the status from normal w/b descriptor */
>>> > +       if (likely(p->des3 & TDES3_RS1V)) {
>>> > +               if (likely(p->des1 & RDES1_TIMESTAMP_AVAILABLE)) {
>>> > +                       int i = 0;
>>> > +
>>> > +                       /* Check if timestamp is OK from context
>>> > descriptor */
>>> > +                       do {
>>> > +                               ret = dwmac4_rx_check_timestamp(desc);
>>
>> Here, "desc" is not pointing to next descriptor (ie context
>> descriptor). Driver should check the context descriptor.
>
>
> you are right and this is done by the caller:  stmmac_get_rx_hwtstamp

Yes.

>
> Cheers
> peppe
>



-- 
wwr
Rayagond