netdev - Re: [PATCH net-next v3 4/4] net: ngbe: Add support for 1PPS and TOD

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Message-ID: <Z4KfZwcyraeFUtNr@hoboy.vegasvil.org>
Date: Sat, 11 Jan 2025 08:42:15 -0800
From: Richard Cochran <richardcochran@...il.com>
To: Jiawen Wu <jiawenwu@...stnetic.com>
Cc: andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, linux@...linux.org.uk,
	horms@...nel.org, jacob.e.keller@...el.com, netdev@...r.kernel.org,
	vadim.fedorenko@...ux.dev, mengyuanlou@...-swift.com
Subject: Re: [PATCH net-next v3 4/4] net: ngbe: Add support for 1PPS and TOD

On Fri, Jan 10, 2025 at 11:17:16AM +0800, Jiawen Wu wrote:

> +static int wx_ptp_feature_enable(struct ptp_clock_info *ptp,
> +				 struct ptp_clock_request *rq, int on)
> +{
> +	struct wx *wx = container_of(ptp, struct wx, ptp_caps);
> +
> +	/**
> +	 * When PPS is enabled, unmask the interrupt for the ClockOut
> +	 * feature, so that the interrupt handler can send the PPS
> +	 * event when the clock SDP triggers. Clear mask when PPS is
> +	 * disabled
> +	 */
> +	if (rq->type != PTP_CLK_REQ_PEROUT || !wx->ptp_setup_sdp)
> +		return -EOPNOTSUPP;
> +
> +	/* Reject requests with unsupported flags */
> +	if (rq->perout.flags & ~PTP_PEROUT_PHASE)
> +		return -EOPNOTSUPP;
> +
> +	if (rq->perout.index != 0) {
> +		wx_err(wx, "Perout index must be 0\n");
> +		return -EINVAL;
> +	}

Why do you need this test?

Framework in drivers/ptp/ptp_chardev.c does:

 299                 if (req.perout.index >= ops->n_per_out) {
 300                         err = -EINVAL;
 301                         break;
 302                 }

Thanks,
Richard