linux-kernel - Re: [PATCH v5 net-next 2/4] net: ethernet: ti: am65-cpsw: add mqprio qdisc offload in channel mode

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Message-ID: <20231001065554.GH92317@kernel.org>
Date:   Sun, 1 Oct 2023 08:55:54 +0200
From:   Simon Horman <horms@...nel.org>
To:     Roger Quadros <rogerq@...nel.org>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, vladimir.oltean@....com, s-vadapalli@...com,
        srk@...com, vigneshr@...com, p-varis@...com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 net-next 2/4] net: ethernet: ti: am65-cpsw: add mqprio
 qdisc offload in channel mode

On Wed, Sep 27, 2023 at 10:27:39AM +0300, Roger Quadros wrote:

...

> +static int am65_cpsw_setup_mqprio(struct net_device *ndev, void *type_data)
> +{
> +	struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
> +	struct am65_cpsw_mqprio *p_mqprio = &port->qos.mqprio;
> +	struct tc_mqprio_qopt_offload *mqprio = type_data;
> +	struct am65_cpsw_common *common = port->common;
> +	struct tc_mqprio_qopt *qopt = &mqprio->qopt;
> +	int tc, offset, count, ret, prio;
> +	u8 num_tc = qopt->num_tc;
> +	u32 tx_prio_map = 0;
> +	int i;
> +
> +	memcpy(&p_mqprio->mqprio_hw, mqprio, sizeof(*mqprio));
> +
> +	ret = pm_runtime_get_sync(common->dev);
> +	if (ret < 0) {
> +		pm_runtime_put_noidle(common->dev);
> +		return ret;
> +	}
> +
> +	if (!num_tc) {
> +		am65_cpsw_reset_tc_mqprio(ndev);
> +		goto exit_put;
> +	}
> +
> +	ret = am65_cpsw_mqprio_verify_shaper(port, mqprio);
> +	if (ret)
> +		goto exit_put;
> +
> +	netdev_set_num_tc(ndev, num_tc);
> +
> +	/* Multiple Linux priorities can map to a Traffic Class
> +	 * A Traffic Class can have multiple contiguous Queues,
> +	 * Queues get mapped to Channels (thread_id),
> +	 *	if not VLAN tagged, thread_id is used as packet_priority
> +	 *	if VLAN tagged. VLAN priority is used as packet_priorit

Hi,

I don't think it is worth respinning just because of this, but
there seems to be a 'y' missing from the end of the line above.

> +	 * packet_priority gets mapped to header_priority in p0_rx_pri_map,
> +	 * header_priority gets mapped to switch_priority in pn_tx_pri_map.
> +	 * As p0_rx_pri_map is left at defaults (0x76543210), we can
> +	 * assume that Queue_n gets mapped to header_priority_n. We can then
> +	 * set the switch priority in pn_tx_pri_map.
> +	 */

...