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Message-ID: <87r1b3nw93.fsf@kurt>
Date: Fri, 26 Nov 2021 09:42:32 +0100
From: Kurt Kanzenbach <kurt@...utronix.de>
To: Vladimir Oltean <olteanv@...il.com>,
Richard Cochran <richardcochran@...il.com>
Cc: Martin Kaistra <martin.kaistra@...utronix.de>,
Florian Fainelli <f.fainelli@...il.com>,
Andrew Lunn <andrew@...n.ch>,
Vivien Didelot <vivien.didelot@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
John Stultz <john.stultz@...aro.org>,
Thomas Gleixner <tglx@...utronix.de>,
Stephen Boyd <sboyd@...nel.org>,
Russell King <linux@...linux.org.uk>,
Marc Kleine-Budde <mkl@...gutronix.de>,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 7/7] net: dsa: b53: Expose PTP timestamping ioctls to
userspace
On Thu Nov 25 2021, Vladimir Oltean wrote:
> On Mon, Nov 08, 2021 at 06:48:24AM -0800, Richard Cochran wrote:
>> On Sun, Nov 07, 2021 at 04:27:03PM +0200, Vladimir Oltean wrote:
>> > On Sun, Nov 07, 2021 at 06:05:34AM -0800, Richard Cochran wrote:
>> > > switch (cfg.rx_filter) {
>> > > case HWTSTAMP_FILTER_NONE:
>> > > break;
>> > > case HWTSTAMP_FILTER_ALL:
>> > > case HWTSTAMP_FILTER_SOME:
>> > > case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
>> > > case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
>> > > case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
>> > > case HWTSTAMP_FILTER_NTP_ALL:
>> > > case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
>> > > case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
>> > > case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
>> > > case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
>> > > case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
>> > > case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
>> > > case HWTSTAMP_FILTER_PTP_V2_EVENT:
>> > > case HWTSTAMP_FILTER_PTP_V2_SYNC:
>> > > case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
>> > > cfg.rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
>> > > break;
>> > > default:
>> > > mutex_unlock(&ocelot->ptp_lock);
>> > > return -ERANGE;
>> > > }
>> > >
>> > > That is essentially an upgrade to HWTSTAMP_FILTER_PTP_V2_EVENT. The
>> > > change from ALL to HWTSTAMP_FILTER_PTP_V2_EVENT is probably a simple
>> > > oversight, and the driver can be easily fixed.
>> > >
>> > > Thanks,
>> > > Richard
>> >
>> > It's essentially the same pattern as what Martin is introducing for b53.
>>
>> Uh, no it isn't. The present patch has:
>>
>> + case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
>> + case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
>> + case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
>> + case HWTSTAMP_FILTER_PTP_V2_EVENT:
>> + case HWTSTAMP_FILTER_PTP_V2_SYNC:
>> + case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
>> + case HWTSTAMP_FILTER_ALL:
>> + config->rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
>>
>> There is an important difference between
>> HWTSTAMP_FILTER_PTP_V2_L2_EVENT and HWTSTAMP_FILTER_PTP_V2_EVENT
>>
>> Notice the "L2" in there.
>
> Richard, when the request is PTP_V2_EVENT and the response is
> PTP_V2_L2_EVENT, is that an upgrade or a downgrade?
It is a downgrade, isn't it?
> PTP_V2_EVENT also includes PTP_V2_L4_EVENT.
Yes, exactly.
Thanks,
Kurt
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