From: Vladimir Oltean <olteanv@gmail.com>
To: Richard Cochran <richardcochran@gmail.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>,
Vivien Didelot <vivien.didelot@gmail.com>,
Andrew Lunn <andrew@lunn.ch>,
"David S. Miller" <davem@davemloft.net>,
John Stultz <john.stultz@linaro.org>,
Thomas Gleixner <tglx@linutronix.de>,
Stephen Boyd <sboyd@kernel.org>,
lkml <linux-kernel@vger.kernel.org>,
netdev <netdev@vger.kernel.org>
Subject: Re: [PATCH net-next 0/5] PTP support for the SJA1105 DSA driver
Date: Thu, 30 May 2019 18:23:09 +0300 [thread overview]
Message-ID: <CA+h21hrBwR4Sow7q0_rS1u2md1M4bSAJt8FO5+VLFiu9UGnvjA@mail.gmail.com> (raw)
In-Reply-To: <20190530150557.iur7fruhyf5bs3qw@localhost>
On Thu, 30 May 2019 at 18:06, Richard Cochran <richardcochran@gmail.com> wrote:
>
> On Thu, May 30, 2019 at 05:57:30PM +0300, Vladimir Oltean wrote:
> > On Thu, 30 May 2019 at 17:30, Richard Cochran <richardcochran@gmail.com> wrote:
> > >
> > > Not necessarily. If two frames that arrive at nearly the same time
> > > get their timestamps mixed up, that would be enough to break the time
> > > values but without breaking your state machine.
> > >
> >
> > This doesn't exactly sound like the type of thing I can check for.
>
> And that is why it cannot work.
>
> > The RX and TX timestamps *are* monotonically increasing with time for
> > all frames when I'm printing them in the {rx,tx}tstamp callbacks.
>
> But are the frames received in the same order? What happens your MAC
> drops a frame?
>
If it drops a normal frame, it carries on.
If it drops a meta frame, it prints "Expected meta frame", resets the
state machine and carries on.
If it drops a timestampable frame, it prints "Unexpected meta frame",
resets the state machine and carries on.
This doesn't happen under correct runtime conditions though.
-Vladimir
> > The driver returns free-running timestamps altered with a timecounter
> > frequency set by adjfine and offset set by adjtime.
>
> That should be correct.
>
> Thanks,
> Richard
next prev parent reply other threads:[~2019-05-30 15:23 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-28 23:56 [PATCH net-next 0/5] PTP support for the SJA1105 DSA driver Vladimir Oltean
2019-05-28 23:56 ` [PATCH net-next 1/5] timecounter: Add helper for reconstructing partial timestamps Vladimir Oltean
2019-05-29 2:14 ` John Stultz
2019-05-29 4:40 ` Richard Cochran
2019-05-29 20:23 ` Vladimir Oltean
2019-05-28 23:56 ` [PATCH net-next 2/5] net: dsa: sja1105: Add support for the PTP clock Vladimir Oltean
2019-05-28 23:56 ` [PATCH net-next 3/5] net: dsa: mv88e6xxx: Let taggers specify a can_timestamp function Vladimir Oltean
2019-05-29 4:49 ` Richard Cochran
2019-05-29 20:33 ` Vladimir Oltean
2019-05-30 3:51 ` Richard Cochran
2019-05-30 7:42 ` Vladimir Oltean
2019-05-30 14:23 ` Richard Cochran
2019-05-30 14:40 ` Richard Cochran
2019-05-30 14:47 ` Vladimir Oltean
2019-05-30 15:01 ` Richard Cochran
2019-11-19 11:35 ` Design issue in DSA RX timestamping (Was "Re: [PATCH net-next 3/5] net: dsa: mv88e6xxx: Let taggers specify a can_timestamp function") Vladimir Oltean
2019-11-19 14:03 ` Richard Cochran
2019-05-28 23:56 ` [PATCH net-next 4/5] net: dsa: sja1105: Add support for PTP timestamping Vladimir Oltean
2019-05-28 23:56 ` [PATCH net-next 5/5] net: dsa: sja1105: Increase priority of CPU-trapped frames Vladimir Oltean
2019-05-29 4:52 ` [PATCH net-next 0/5] PTP support for the SJA1105 DSA driver Richard Cochran
2019-05-29 20:41 ` Vladimir Oltean
2019-05-30 3:45 ` Richard Cochran
2019-05-30 9:01 ` Vladimir Oltean
2019-05-30 14:30 ` Richard Cochran
2019-05-30 14:57 ` Vladimir Oltean
2019-05-30 15:05 ` Richard Cochran
2019-05-30 15:23 ` Vladimir Oltean [this message]
2019-05-31 4:34 ` Richard Cochran
2019-05-31 13:23 ` Vladimir Oltean
2019-05-31 14:08 ` Richard Cochran
2019-05-31 14:27 ` Vladimir Oltean
2019-05-31 15:11 ` Richard Cochran
2019-05-31 15:21 ` Richard Cochran
2019-05-31 15:23 ` Vladimir Oltean
2019-05-31 16:09 ` Richard Cochran
2019-05-31 16:16 ` Vladimir Oltean
2019-05-31 18:12 ` Vladimir Oltean
2019-06-01 5:07 ` Richard Cochran
2019-06-01 10:31 ` Vladimir Oltean
2019-06-01 12:06 ` Vladimir Oltean
2019-06-02 2:18 ` Richard Cochran
2019-06-02 2:17 ` Richard Cochran
2019-06-01 5:03 ` Richard Cochran
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