linux-kernel - Re: [net-next, v3, 02/10] ptp: support ptp physical/virtual clocks conversion

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Date:   Thu, 17 Jun 2021 20:27:45 +0200
From:   Richard Cochran <richardcochran@...il.com>
To:     Yangbo Lu <yangbo.lu@....com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, mptcp@...ts.linux.dev,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        Matthieu Baerts <matthieu.baerts@...sares.net>,
        Shuah Khan <shuah@...nel.org>,
        Michal Kubecek <mkubecek@...e.cz>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>, Rui Sousa <rui.sousa@....com>,
        Sebastien Laveze <sebastien.laveze@....com>
Subject: Re: [net-next, v3, 02/10] ptp: support ptp physical/virtual clocks
 conversion

On Tue, Jun 15, 2021 at 05:45:09PM +0800, Yangbo Lu wrote:

> diff --git a/drivers/ptp/ptp_private.h b/drivers/ptp/ptp_private.h
> index 3f388d63904c..6949afc9d733 100644
> --- a/drivers/ptp/ptp_private.h
> +++ b/drivers/ptp/ptp_private.h
> @@ -46,6 +46,9 @@ struct ptp_clock {
>  	const struct attribute_group *pin_attr_groups[2];
>  	struct kthread_worker *kworker;
>  	struct kthread_delayed_work aux_work;
> +	u8 n_vclocks;

Hm, type is u8, but ...

> +	struct mutex n_vclocks_mux; /* protect concurrent n_vclocks access */
> +	bool vclock_flag;
>  };
>  

>  #define info_to_vclock(d) container_of((d), struct ptp_vclock, info)
> diff --git a/include/uapi/linux/ptp_clock.h b/include/uapi/linux/ptp_clock.h
> index 1d108d597f66..4b933dc1b81b 100644
> --- a/include/uapi/linux/ptp_clock.h
> +++ b/include/uapi/linux/ptp_clock.h
> @@ -69,6 +69,11 @@
>   */
>  #define PTP_PEROUT_V1_VALID_FLAGS	(0)
>  
> +/*
> + * Max number of PTP virtual clocks per PTP physical clock
> + */
> +#define PTP_MAX_VCLOCKS			20

Only 20 clocks are allowed?  Why?

Thanks,
Richard