netdev - Re: [Intel-wired-lan] [PATCH next-queue v2 3/3] igc: Add support for PTP getcrosststamp()

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Message-ID: <20201114025704.GA15240@hoboy.vegasvil.org>
Date:   Fri, 13 Nov 2020 18:57:04 -0800
From:   Richard Cochran <richardcochran@...il.com>
To:     Vinicius Costa Gomes <vinicius.gomes@...el.com>
Cc:     Miroslav Lichvar <mlichvar@...hat.com>,
        intel-wired-lan@...ts.osuosl.org, andre.guedes@...el.com,
        linux-pci@...r.kernel.org, netdev@...r.kernel.org,
        bhelgaas@...gle.com
Subject: Re: [Intel-wired-lan] [PATCH next-queue v2 3/3] igc: Add support for
 PTP getcrosststamp()

On Fri, Nov 13, 2020 at 11:10:58AM -0800, Vinicius Costa Gomes wrote:
> I am proposing a series that adds support for PCIe PTM (for the igc
> driver), exporting the values via the PTP_SYS_OFFSET_PRECISE ioctl().
> 
> The way PTM works in the NIC I have, kind of forces me to start the PTM
> dialogs during initialization, and they are kept running in background,
> what the _PRECISE ioctl() does is basically collecting the most recent
> measurement.

What is a PTM?  Why does a PTM have dialogs?  Can it talk?

Forgive my total ignorance!

Thanks,
Richard