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From: Richard Cochran <richardcochran@gmail.com>
To: "Y.b. Lu" <yangbo.lu@nxp.com>
Cc: "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-kselftest@vger.kernel.org"
	<linux-kselftest@vger.kernel.org>,
	"mptcp@lists.linux.dev" <mptcp@lists.linux.dev>,
	"David S . Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Mat Martineau <mathew.j.martineau@linux.intel.com>,
	Matthieu Baerts <matthieu.baerts@tessares.net>,
	Shuah Khan <shuah@kernel.org>, Michal Kubecek <mkubecek@suse.cz>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Andrew Lunn <andrew@lunn.ch>, Rui Sousa <rui.sousa@nxp.com>,
	Sebastien Laveze <sebastien.laveze@nxp.com>
Subject: Re: [net-next, v5, 08/11] net: sock: extend SO_TIMESTAMPING for PHC binding
Date: Mon, 5 Jul 2021 11:44:01 -0700	[thread overview]
Message-ID: <20210705184401.GA16128@hoboy.vegasvil.org> (raw)
In-Reply-To: <DB7PR04MB50174906EE8CCEB4A02F4C17F81C9@DB7PR04MB5017.eurprd04.prod.outlook.com>

On Mon, Jul 05, 2021 at 08:19:30AM +0000, Y.b. Lu wrote:
> When several ptp virtual clocks are created, the ptp physical clock is guaranteed for free running.
> 
> What I think is, for timestamping, if no flag SOF_TIMESTAMPING_BIND_PHC, the timestamping keeps using ptp physical clock.
> If application wants to bind one ptp virtual clock for timestamping, the flag SOF_TIMESTAMPING_BIND_PHC should be set and clock index should be provided.
> After all, several ptp virtual clocks created are likely for different timescale/use case. There should be a method for any of applications to select the right one to use.
> 
> Does it make sense?

Yes, indeed.  I totally forgot that the user space PTP stack has
network sockets bond to interfaces, and they are completely separate
from the PHC clockid_t.  Need more sleep...

Thanks,
Richard

  reply	other threads:[~2021-07-05 18:44 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-30  8:11 [net-next, v5, 00/11] ptp: support virtual clocks and timestamping Yangbo Lu
2021-06-30  8:11 ` [net-next, v5, 01/11] ptp: add ptp virtual clock driver framework Yangbo Lu
2021-06-30  8:11 ` [net-next, v5, 02/11] ptp: support ptp physical/virtual clocks conversion Yangbo Lu
2021-07-04 10:25   ` [ptp] becdd56786: BUG:kernel_NULL_pointer_dereference,address kernel test robot
2021-08-07  1:15   ` [net-next, v5, 02/11] ptp: support ptp physical/virtual clocks conversion Vinicius Costa Gomes
2021-08-07 14:22     ` Richard Cochran
2021-08-07 14:43       ` Vladimir Oltean
2021-08-07 20:56         ` Richard Cochran
2021-06-30  8:11 ` [net-next, v5, 03/11] ptp: track available ptp vclocks information Yangbo Lu
2021-06-30  8:11 ` [net-next, v5, 04/11] ptp: add kernel API ptp_get_vclocks_index() Yangbo Lu
2021-06-30  8:11 ` [net-next, v5, 05/11] ethtool: add a new command for getting PHC virtual clocks Yangbo Lu
2021-06-30  8:11 ` [net-next, v5, 06/11] ptp: add kernel API ptp_convert_timestamp() Yangbo Lu
2021-06-30  8:11 ` [net-next, v5, 07/11] mptcp: setsockopt: convert to mptcp_setsockopt_sol_socket_timestamping() Yangbo Lu
2021-06-30  8:11 ` [net-next, v5, 08/11] net: sock: extend SO_TIMESTAMPING for PHC binding Yangbo Lu
2021-07-04 13:33   ` Richard Cochran
2021-07-05  8:19     ` Y.b. Lu
2021-07-05 18:44       ` Richard Cochran [this message]
2021-06-30  8:12 ` [net-next, v5, 09/11] net: socket: support hardware timestamp conversion to PHC bound Yangbo Lu
2021-06-30  8:12 ` [net-next, v5, 10/11] selftests/net: timestamping: support binding PHC Yangbo Lu
2021-06-30  8:12 ` [net-next, v5, 11/11] MAINTAINERS: add entry for PTP virtual clock driver Yangbo Lu
2021-07-01 20:20 ` [net-next, v5, 00/11] ptp: support virtual clocks and timestamping patchwork-bot+netdevbpf

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