linux-kernel - Re: [RFC Patch net-next 0/6] net: dsa: microchip: add gPTP support for LAN937x switch

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Message-ID: <20221018095515.tnhqjlyvu3dmtn3q@skbuf>
Date:   Tue, 18 Oct 2022 12:55:15 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Arun.Ramadoss@...rochip.com
Cc:     andrew@...n.ch, linux-kernel@...r.kernel.org,
        UNGLinuxDriver@...rochip.com, vivien.didelot@...il.com,
        linux@...linux.org.uk, Tristram.Ha@...rochip.com,
        f.fainelli@...il.com, kuba@...nel.org, edumazet@...gle.com,
        pabeni@...hat.com, richardcochran@...il.com,
        netdev@...r.kernel.org, Woojung.Huh@...rochip.com,
        davem@...emloft.net
Subject: Re: [RFC Patch net-next 0/6] net: dsa: microchip: add gPTP support
 for LAN937x switch

On Tue, Oct 18, 2022 at 06:29:17AM +0000, Arun.Ramadoss@...rochip.com wrote:
> > On Fri, Oct 14, 2022 at 08:58:51PM +0530, Arun Ramadoss wrote:
> > > The LAN937x switch has capable for supporting IEEE 1588 PTP protocol. This
> > > patch series add gPTP profile support and tested using the ptp4l application.
> > > LAN937x has the same PTP register set similar to KSZ9563, hence the
> > > implementation has been made common for the ksz switches. But the testing is
> > > done only for lan937x switch.
> > 
> > Unrelated to the proposed implementation. What user space stack do you
> > use for gPTP bridging?
> 
> I had used LinuxPTP stack for testing this patch set and in specific
> linuxptp/configs/gptp.cfg 
> 
> Test Setup is of
> LAN9370 DUT1 <LAN1> --- LAN9370 DUT2 <LAN1>
> 
> Ran the below command in both DUTS
> #ptp4l -f ~/linuxptp/configs/gptp.cfg -i lan1

gPTP bridges are when you specify "-i" more than once, similar to how
1588 boundary clocks are created in ptp4l. Linuxptp does not support
gPTP bridges; the time information needs to be relayed differently
compared to both a BC and a TC, and there is also a Follow_Up information
TLV which needs to be updated.

So I guess the answer is, you don't test gPTP bridging, ok.