From: Richard Cochran <richardcochran@gmail.com>
To: Ido Schimmel <idosch@nvidia.com>
Cc: netdev@vger.kernel.org, davem@davemloft.net, kuba@kernel.org,
pabeni@redhat.com, edumazet@google.com, petrm@nvidia.com,
amcohen@nvidia.com, danieller@nvidia.com, mlxsw@nvidia.com
Subject: Re: [PATCH net-next 0/9] mlxsw: Add PTP support for Spectrum-2 and newer ASICs
Date: Wed, 27 Jul 2022 07:16:31 -0700 [thread overview]
Message-ID: <YuFIvxvB2AxKt9PV@hoboy.vegasvil.org> (raw)
In-Reply-To: <20220727062328.3134613-1-idosch@nvidia.com>
On Wed, Jul 27, 2022 at 09:23:19AM +0300, Ido Schimmel wrote:
> Specifically, the hardware will subtract the current time stamp from the
> correction field at the ingress port and will add the current time stamp
> to the correction field at the egress port.
Doing this in pure HW TC mode, the time scale of the switch's clock
does not matter at all. It can be a free running counter.
> For the purpose of an
> ordinary or boundary clock (this patchset), the correction field will
> always be adjusted between the CPU port and one of the front panel
> ports, but never between two front panel ports.
To clarify, the only reason why you say "never between two front panel
ports" is because the switch will configured not to forward PTP frames
over the front panel ports, for BC mode. For TC operation, the switch
will apply the correction, right?
Thanks,
Richard
next prev parent reply other threads:[~2022-07-27 14:16 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-27 6:23 [PATCH net-next 0/9] mlxsw: Add PTP support for Spectrum-2 and newer ASICs Ido Schimmel
2022-07-27 6:23 ` [PATCH net-next 1/9] mlxsw: spectrum_ptp: Add helper functions to configure PTP traps Ido Schimmel
2022-07-27 6:23 ` [PATCH net-next 2/9] mlxsw: Support CQEv2 for SDQ in Spectrum-2 and newer ASICs Ido Schimmel
2022-07-27 6:23 ` [PATCH net-next 3/9] mlxsw: spectrum_ptp: Add PTP initialization / finalization for Spectrum-2 Ido Schimmel
2022-07-27 6:23 ` [PATCH net-next 4/9] mlxsw: Query UTC sec and nsec PCI offsets and values Ido Schimmel
2022-07-27 6:23 ` [PATCH net-next 5/9] mlxsw: spectrum_ptp: Add implementation for physical hardware clock operations Ido Schimmel
2022-07-27 6:23 ` [PATCH net-next 6/9] mlxsw: Send PTP packets as data packets to overcome a limitation Ido Schimmel
2022-07-27 6:23 ` [PATCH net-next 7/9] mlxsw: spectrum: Support time stamping on Spectrum-2 Ido Schimmel
2022-07-27 6:23 ` [PATCH net-next 8/9] mlxsw: spectrum_ptp: Support SIOCGHWTSTAMP, SIOCSHWTSTAMP ioctls Ido Schimmel
2022-07-27 6:23 ` [PATCH net-next 9/9] mlxsw: spectrum: Support ethtool 'get_ts_info' callback in Spectrum-2 Ido Schimmel
2022-07-27 14:05 ` [PATCH net-next 0/9] mlxsw: Add PTP support for Spectrum-2 and newer ASICs Richard Cochran
2022-07-27 14:48 ` Ido Schimmel
2022-07-27 14:16 ` Richard Cochran [this message]
2022-07-27 14:44 ` Ido Schimmel
2022-07-28 3:09 ` Richard Cochran
2022-07-28 7:03 ` Ido Schimmel
2022-07-29 10:30 ` patchwork-bot+netdevbpf
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