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: <f6eb4bfc-e8f5-491b-8b3b-4cb9eed79483@kernel.org>
Date:   Fri, 6 Oct 2023 15:28:11 +0300
From:   Roger Quadros <rogerq@...nel.org>
To:     Simon Horman <horms@...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 01/10/2023 09:55, Simon Horman wrote:
> 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;am65_cpsw_iet_commit_preemptible_tcs
>> +	}
>> +
>> +	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.

Now that there will be  a re-spin. I'll fix this. Thanks!

> 
>> +	 * 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.
>> +	 */
> 
> ...

-- 
cheers,
-roger