netdev - Re: [PATCH v2 net-next 1/1] net: dsa: hellcreek: Add TAPRIO offloading support

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Date:   Sun, 17 Jan 2021 23:21:52 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Kurt Kanzenbach <kurt@...utronix.de>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        netdev@...r.kernel.org
Subject: Re: [PATCH v2 net-next 1/1] net: dsa: hellcreek: Add TAPRIO
 offloading support

On Sat, Jan 16, 2021 at 01:49:22PM +0100, Kurt Kanzenbach wrote:
> The switch has support for the 802.1Qbv Time Aware Shaper (TAS). Traffic
> schedules may be configured individually on each front port. Each port has eight
> egress queues. The traffic is mapped to a traffic class respectively via the PCP
> field of a VLAN tagged frame.
>
> The TAPRIO Qdisc already implements that. Therefore, this interface can simply
> be reused. Add .port_setup_tc() accordingly.
>
> The activation of a schedule on a port is split into two parts:
>
>  * Programming the necessary gate control list (GCL)
>  * Setup delayed work for starting the schedule
>
> The hardware supports starting a schedule up to eight seconds in the future. The
> TAPRIO interface provides an absolute base time. Therefore, periodic delayed
> work is leveraged to check whether a schedule may be started or not.
>
> Signed-off-by: Kurt Kanzenbach <kurt@...utronix.de>
> ---

Reviewed-by: Vladimir Oltean <olteanv@...il.com>