linux-kernel - Re: [PATCH 7/7] net: dsa: b53: Expose PTP timestamping ioctls to userspace

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Date:   Thu, 4 Nov 2021 10:42:51 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Martin Kaistra <martin.kaistra@...utronix.de>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Stephen Boyd <sboyd@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 7/7] net: dsa: b53: Expose PTP timestamping ioctls to
 userspace

On Thu, Nov 04, 2021 at 02:32:01PM +0100, Martin Kaistra wrote:
> +static int b53_set_hwtstamp_config(struct b53_device *dev, int port,
> +				   struct hwtstamp_config *config)
> +{
> +	struct b53_port_hwtstamp *ps = &dev->ports[port].port_hwtstamp;
> +	bool tstamp_enable = false;
> +
> +	clear_bit_unlock(B53_HWTSTAMP_ENABLED, &ps->state);
> +
> +	/* Reserved for future extensions */
> +	if (config->flags)
> +		return -EINVAL;
> +
> +	switch (config->tx_type) {
> +	case HWTSTAMP_TX_ON:
> +		tstamp_enable = true;
> +		break;
> +	case HWTSTAMP_TX_OFF:
> +		tstamp_enable = false;
> +		break;
> +	default:
> +		return -ERANGE;
> +	}
> +
> +	switch (config->rx_filter) {
> +	case HWTSTAMP_FILTER_NONE:
> +		tstamp_enable = false;
> +		break;
> +	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
> +	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
> +	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
> +	case HWTSTAMP_FILTER_PTP_V2_EVENT:
> +	case HWTSTAMP_FILTER_PTP_V2_SYNC:
> +	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:

This is incorrect.  HWTSTAMP_FILTER_PTP_V2_EVENT includes support for
UDP/IPv4 and UDP/IPv6.  Driver should return error here.

> +	case HWTSTAMP_FILTER_ALL:
> +		config->rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT;
> +		break;
> +	default:
> +		return -ERANGE;
> +	}

Thanks,
Richard