netdev - Re: [PATCH net-next 1/1] igc: ptp: Add 1-step functionality to igc driver

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Message-ID: <YxpsejCwi8SfoNIC@hoboy.vegasvil.org>
Date:   Thu, 8 Sep 2022 15:28:10 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Lasse Johnsen <lasse@...ebeat.app>
Cc:     netdev@...r.kernel.org, Tony Nguyen <anthony.l.nguyen@...el.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        "Stanton, Kevin B" <kevin.b.stanton@...el.com>,
        Jonathan Lemon <bsd@...com>
Subject: Re: [PATCH net-next 1/1] igc: ptp: Add 1-step functionality to igc
 driver

On Thu, Sep 08, 2022 at 11:18:35PM +0100, Lasse Johnsen wrote:
> This patch adds 1-step functionality to the igc driver
> 1-step is only supported in L2 PTP
> (... as the hardware can update the FCS, but not the UDP checksum on the fly..)

What happens when user space dials one-step, but in a UDPv4 PTP network?

Thanks,
Richard