netdev - Re: [PATCH RFC net] igb: Fix XDP with PTP enabled

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Date:   Tue, 13 Apr 2021 19:21:00 +0200
From:   Kurt Kanzenbach <kurt@...utronix.de>
To:     Alexander Duyck <alexander.duyck@...il.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        Sven Auhagen <sven.auhagen@...eatech.de>,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: Re: [PATCH RFC net] igb: Fix XDP with PTP enabled

On Tue Apr 13 2021, Alexander Duyck wrote:
> On Mon, Apr 12, 2021 at 7:29 AM Jesper Dangaard Brouer
> <brouer@...hat.com> wrote:
>> > +ktime_t igb_ptp_rx_pktstamp(struct igb_q_vector *q_vector, void *va)
>> >  {
>> >       struct igb_adapter *adapter = q_vector->adapter;
>> > +     struct skb_shared_hwtstamps ts;
>> >       __le64 *regval = (__le64 *)va;
>> >       int adjust = 0;
>> >
>> >       if (!(adapter->ptp_flags & IGB_PTP_ENABLED))
>> > -             return IGB_RET_PTP_DISABLED;
>> > +             return 0;
>> >
>> >       /* The timestamp is recorded in little endian format.
>> >        * DWORD: 0        1        2        3
>> > @@ -888,10 +887,9 @@ int igb_ptp_rx_pktstamp(struct igb_q_vector *q_vector, void *va,
>> >
>> >       /* check reserved dwords are zero, be/le doesn't matter for zero */
>> >       if (regval[0])
>> > -             return IGB_RET_PTP_INVALID;
>> > +             return 0;
>> >
>
> One thing that needs to be cleaned up in the patch is that if it is
> going to drop these return values it should probably drop the defines
> for them since I don't think they are used anywhere else.

Yes, of course. I'll clean it up before sending a non RFC version.

Thanks,
Kurt

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