linux-kernel - Re: [PATCH v2] net: stmmac: correct MAC propagation delay

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Message-ID: <ZMFfI3xU5pkJW4x4@hoboy.vegasvil.org>
Date:   Wed, 26 Jul 2023 11:00:03 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Johannes Zink <j.zink@...gutronix.de>
Cc:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Russell King <linux@...linux.org.uk>,
        patchwork-jzi@...gutronix.de, netdev@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v2] net: stmmac: correct MAC propagation delay

On Mon, Jul 24, 2023 at 12:01:31PM +0200, Johannes Zink wrote:

> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.h b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.h
> index bf619295d079..d1fe4b46f162 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.h
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.h
> @@ -26,6 +26,12 @@
>  #define	PTP_ACR		0x40	/* Auxiliary Control Reg */
>  #define	PTP_ATNR	0x48	/* Auxiliary Timestamp - Nanoseconds Reg */
>  #define	PTP_ATSR	0x4c	/* Auxiliary Timestamp - Seconds Reg */
> +#define	PTP_TS_INGR_CORR_NS	0x58	/* Ingress timestamp correction nanoseconds */
> +#define	PTP_TS_EGR_CORR_NS	0x5C	/* Egress timestamp correction nanoseconds*/
> +#define	PTP_TS_INGR_CORR_SNS	0x60	/* Ingress timestamp correction subnanoseconds */
> +#define	PTP_TS_EGR_CORR_SNS	0x64	/* Egress timestamp correction subnanoseconds */

These two...

> +#define	PTP_TS_INGR_LAT	0x68	/* MAC internal Ingress Latency */
> +#define	PTP_TS_EGR_LAT	0x6c	/* MAC internal Egress Latency */

do not exist on earlier versions of the IP core.

I wonder what values are there?

Thanks,
Richard