netdev - Re: [PATCH RFC net-next] net: phy: add Marvell PHY PTP support

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Message-ID: <20200720142146.GB16001@hoboy>
Date:   Mon, 20 Jul 2020 07:21:46 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Kurt Kanzenbach <kurt.kanzenbach@...utronix.de>
Cc:     Russell King <rmk+kernel@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Subject: Re: [PATCH RFC net-next] net: phy: add Marvell PHY PTP support

On Fri, Jul 17, 2020 at 07:24:46PM -0700, Richard Cochran wrote:
> On Fri, Jul 17, 2020 at 09:54:07AM +0200, Kurt Kanzenbach wrote:
> > I'll post the next version of the hellcreek DSA driver probably next
> > week. I can include a generic ptp_header() function if you like in that
> > patch series. But, where to put it? ptp core or maybe ptp_classify?
> 
> Either place is fine with me.  Maybe it makes most sense in ptp_classify?
> Please put the re-factoring in a separate patches, before the new
> driver.

And maybe the new header parsing routine should provide a pointer to a
structure with the message layout.  Something similar to this (from
the linuxptp user stack) might work.

struct ptp_header {
	uint8_t             tsmt; /* transportSpecific | messageType */
	uint8_t             ver;  /* reserved          | versionPTP  */
	UInteger16          messageLength;
	UInteger8           domainNumber;
	Octet               reserved1;
	Octet               flagField[2];
	Integer64           correction;
	UInteger32          reserved2;
	struct PortIdentity sourcePortIdentity;
	UInteger16          sequenceId;
	UInteger8           control;
	Integer8            logMessageInterval;
} PACKED;


Of course, the structure should use the kernel types that include the
big endian annotations.

Thanks,
Richard