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From: Vladimir Oltean <olteanv@gmail.com>
To: Kurt Kanzenbach <kurt@linutronix.de>
Cc: Andrew Lunn <andrew@lunn.ch>,
	Vivien Didelot <vivien.didelot@gmail.com>,
	Florian Fainelli <f.fainelli@gmail.com>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	netdev@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
	devicetree@vger.kernel.org,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Richard Cochran <richardcochran@gmail.com>,
	Kamil Alkhouri <kamil.alkhouri@hs-offenburg.de>,
	ilias.apalodimas@linaro.org
Subject: Re: [PATCH v3 5/8] net: dsa: hellcreek: Add TAPRIO offloading support
Date: Sat, 22 Aug 2020 17:39:22 +0300	[thread overview]
Message-ID: <20200822143922.frjtog4mcyaegtyg@skbuf> (raw)
In-Reply-To: <20200820081118.10105-6-kurt@linutronix.de>

Hi Kurt,

On Thu, Aug 20, 2020 at 10:11:15AM +0200, 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 hrtimer 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, hrtimers are
> leveraged.
> 
> Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
> ---
>  drivers/net/dsa/hirschmann/hellcreek.c | 294 +++++++++++++++++++++++++
>  drivers/net/dsa/hirschmann/hellcreek.h |  21 ++
>  2 files changed, 315 insertions(+)
> 
> diff --git a/drivers/net/dsa/hirschmann/hellcreek.c b/drivers/net/dsa/hirschmann/hellcreek.c
> index 745ca60342b4..e5b54f42c635 100644
> --- a/drivers/net/dsa/hirschmann/hellcreek.c
> +++ b/drivers/net/dsa/hirschmann/hellcreek.c
> @@ -22,7 +22,9 @@
>  #include <linux/spinlock.h>
>  #include <linux/delay.h>
>  #include <linux/ktime.h>
> +#include <linux/time.h>
>  #include <net/dsa.h>
> +#include <net/pkt_sched.h>
>  
>  #include "hellcreek.h"
>  #include "hellcreek_ptp.h"
> @@ -153,6 +155,15 @@ static void hellcreek_select_vlan(struct hellcreek *hellcreek, int vid,
>  	hellcreek_write(hellcreek, val, HR_VIDCFG);
>  }
>  
> +static void hellcreek_select_tgd(struct hellcreek *hellcreek, int port)
> +{
> +	u16 val = 0;
> +
> +	val |= port << TR_TGDSEL_TDGSEL_SHIFT;
> +
> +	hellcreek_write(hellcreek, val, TR_TGDSEL);
> +}
> +
>  static int hellcreek_wait_until_ready(struct hellcreek *hellcreek)
>  {
>  	u16 val;
> @@ -958,6 +969,24 @@ static void __hellcreek_setup_tc_identity_mapping(struct hellcreek *hellcreek)
>  	}
>  }
>  
> +static void hellcreek_setup_tc_mapping(struct hellcreek *hellcreek,
> +				       struct net_device *netdev)
> +{
> +	int i, j;
> +
> +	/* Setup mapping between traffic classes and port queues. */
> +	for (i = 0; i < netdev_get_num_tc(netdev); ++i) {
> +		for (j = 0; j < netdev->tc_to_txq[i].count; ++j) {
> +			const int queue = j + netdev->tc_to_txq[i].offset;
> +
> +			hellcreek_select_prio(hellcreek, i);
> +			hellcreek_write(hellcreek,
> +					queue << HR_PRTCCFG_PCP_TC_MAP_SHIFT,
> +					HR_PRTCCFG);
> +		}
> +	}
> +}

What other driver have you seen that does this?

> +
> +static int hellcreek_port_set_schedule(struct dsa_switch *ds, int port,
> +				       const struct tc_taprio_qopt_offload *taprio)
> +{
> +	struct net_device *netdev = dsa_to_port(ds, port)->slave;
> +	struct hellcreek *hellcreek = ds->priv;
> +	struct hellcreek_port *hellcreek_port;
> +	struct hellcreek_schedule *schedule;
> +	unsigned long flags;
> +	ktime_t start;
> +	u16 ctrl;
> +
> +	hellcreek_port = &hellcreek->ports[port];
> +
> +	/* Convert taprio data to hellcreek schedule */
> +	schedule = hellcreek_taprio_to_schedule(taprio);
> +	if (IS_ERR(schedule))
> +		return PTR_ERR(schedule);
> +
> +	dev_dbg(hellcreek->dev, "Configure traffic schedule on port %d\n",
> +		port);
> +
> +	/* Cancel an in flight timer */
> +	hrtimer_cancel(&hellcreek_port->cycle_start_timer);
> +
> +	spin_lock_irqsave(&hellcreek->reg_lock, flags);
> +
> +	if (hellcreek_port->current_schedule) {
> +		kfree(hellcreek_port->current_schedule->entries);
> +		kfree(hellcreek_port->current_schedule);
> +	}
> +
> +	hellcreek_port->current_schedule = schedule;
> +
> +	/* First select port */
> +	hellcreek_select_tgd(hellcreek, port);
> +
> +	/* Setup traffic class <-> queue mapping */
> +	hellcreek_setup_tc_mapping(hellcreek, netdev);
> +
> +	/* Enable gating and set the admin state to forward everything in the
> +	 * mean time
> +	 */
> +	ctrl = (0xff << TR_TGDCTRL_ADMINGATESTATES_SHIFT) | TR_TGDCTRL_GATE_EN;
> +	hellcreek_write(hellcreek, ctrl, TR_TGDCTRL);
> +
> +	/* Cancel pending schedule */
> +	hellcreek_write(hellcreek, 0x00, TR_ESTCMD);
> +
> +	/* Setup a new schedule */
> +	hellcreek_setup_gcl(hellcreek, port, schedule);
> +
> +	/* Configure cycle time */
> +	hellcreek_set_cycle_time(hellcreek, schedule);
> +
> +	/* Setup timer for schedule switch: The IP core only allows to set a
> +	 * cycle start timer 8 seconds in the future. This is why we setup the
> +	 * hritmer to base_time - 5 seconds. Then, we have enough time to
> +	 * activate IP core's EST timer.
> +	 */
> +	start = ktime_sub_ns(schedule->base_time, (u64)5 * NSEC_PER_SEC);
> +	hrtimer_start_range_ns(&hellcreek_port->cycle_start_timer, start,
> +			       NSEC_PER_SEC, HRTIMER_MODE_ABS);
> +
> +	spin_unlock_irqrestore(&hellcreek->reg_lock, flags);
> +
> +	return 0;
> +}

Thanks,
-Vladimir

  reply	other threads:[~2020-08-22 14:39 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-20  8:11 [PATCH v3 0/8] Hirschmann Hellcreek DSA driver Kurt Kanzenbach
2020-08-20  8:11 ` [PATCH v3 1/8] net: dsa: Add tag handling for Hirschmann Hellcreek switches Kurt Kanzenbach
2020-08-20  8:11 ` [PATCH v3 2/8] net: dsa: Add DSA driver " Kurt Kanzenbach
2020-08-24 22:44   ` Andrew Lunn
2020-08-25  9:07     ` Kurt Kanzenbach
2020-08-25 13:56       ` Andrew Lunn
2020-08-25 14:48         ` Kurt Kanzenbach
2020-08-27 10:29           ` Kurt Kanzenbach
2020-08-20  8:11 ` [PATCH v3 3/8] net: dsa: hellcreek: Add PTP clock support Kurt Kanzenbach
2020-08-20  8:11 ` [PATCH v3 4/8] net: dsa: hellcreek: Add support for hardware timestamping Kurt Kanzenbach
2020-08-20  8:11 ` [PATCH v3 5/8] net: dsa: hellcreek: Add TAPRIO offloading support Kurt Kanzenbach
2020-08-22 14:39   ` Vladimir Oltean [this message]
2020-08-24  6:10     ` Kurt Kanzenbach
2020-08-24 23:45       ` Vinicius Costa Gomes
2020-08-25  9:42         ` Kurt Kanzenbach
2020-08-25 17:58           ` Vinicius Costa Gomes
2020-08-27 10:12             ` Kurt Kanzenbach
2020-08-25  9:46         ` Vladimir Oltean
2020-08-25 10:09           ` Kurt Kanzenbach
2020-08-25 17:33           ` Vinicius Costa Gomes
2020-08-24 22:56   ` Vladimir Oltean
2020-08-25  9:33     ` Kurt Kanzenbach
2020-08-25  9:38       ` Vladimir Oltean
2020-08-25  9:55         ` Kurt Kanzenbach
2020-08-27 16:25           ` Richard Cochran
2020-08-28 12:31             ` Kurt Kanzenbach
2020-08-24 23:57   ` Vinicius Costa Gomes
2020-08-25  9:23     ` Kurt Kanzenbach
2020-08-25  9:32       ` Vladimir Oltean
2020-09-01 14:20         ` Kurt Kanzenbach
2020-09-01 14:47           ` Vladimir Oltean
2020-08-25 17:50       ` Vinicius Costa Gomes
2020-08-20  8:11 ` [PATCH v3 6/8] net: dsa: hellcreek: Add PTP status LEDs Kurt Kanzenbach
2020-08-24 22:50   ` Andrew Lunn
2020-08-20  8:11 ` [PATCH v3 7/8] dt-bindings: Add vendor prefix for Hirschmann Kurt Kanzenbach
2020-08-20  8:11 ` [PATCH v3 8/8] dt-bindings: net: dsa: Add documentation for Hellcreek switches Kurt Kanzenbach
2020-08-24 22:52   ` Andrew Lunn
2020-08-25 22:28   ` Rob Herring
2020-08-24 21:31 ` [PATCH v3 0/8] Hirschmann Hellcreek DSA driver Jakub Kicinski
2020-08-24 22:02   ` Vladimir Oltean
2020-08-24 22:35     ` David Miller
2020-08-24 22:57       ` Vladimir Oltean
2020-08-25 11:21       ` Kurt Kanzenbach
2020-08-25 17:14         ` Florian Fainelli

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