netdev - Re: [PATCH 5/5] net: dsa: ocelot: add hardware timestamping support for Felix

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Date:   Thu, 21 Nov 2019 03:56:10 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Yangbo Lu <yangbo.lu@....com>
Cc:     netdev@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        "David S . Miller" <davem@...emloft.net>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Richard Cochran <richardcochran@...il.com>
Subject: Re: [PATCH 5/5] net: dsa: ocelot: add hardware timestamping support
 for Felix

> +static irqreturn_t felix_irq_handler(int irq, void *data)
> +{
> +	struct ocelot *ocelot = (struct ocelot *)data;
> +
> +	/* The INTB interrupt is used for both PTP TX timestamp interrupt
> +	 * and preemption status change interrupt on each port.
> +	 *
> +	 * - Get txtstamp if have
> +	 * - TODO: handle preemption. Without handling it, driver may get
> +	 *   interrupt storm.
> +	 */

I assume there are no register bits to enable/disable these two
interrupt sources?

What is preemption?

     Andrew