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Date: Tue, 19 Sep 2023 13:32:11 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Roger Quadros <rogerq@...nel.org>, davem@...emloft.net,
edumazet@...gle.com, kuba@...nel.org, vladimir.oltean@....com
Cc: horms@...nel.org, s-vadapalli@...com, srk@...com, vigneshr@...com,
p-varis@...com, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, rogerq@...nel.rog
Subject: Re: [PATCH v2] net: ethernet: ti: am65-cpsw: add mqprio qdisc
offload in channel mode
On Mon, 2023-09-18 at 10:53 +0300, Roger Quadros wrote:
> @@ -937,3 +918,296 @@ void am65_cpsw_qos_tx_p0_rate_init(struct am65_cpsw_common *common)
> host->port_base + AM65_CPSW_PN_REG_PRI_CIR(tx_ch));
[...]
> +static int am65_cpsw_mqprio_verify_shaper(struct am65_cpsw_port *port,
> + struct tc_mqprio_qopt_offload *mqprio)
> +{
> + u64 min_rate_total = 0, max_rate_total = 0;
> + u32 min_rate_msk = 0, max_rate_msk = 0;
> + bool has_min_rate, has_max_rate;
> + int num_tc, i;
> + struct am65_cpsw_mqprio *p_mqprio = &port->qos.mqprio;
> + struct netlink_ext_ack *extack = mqprio->extack;
Please, respect the reverse x-mas tree order.
> +
> + if (!(mqprio->flags & TC_MQPRIO_F_SHAPER))
> + return 0;
> +
> + if (mqprio->shaper != TC_MQPRIO_SHAPER_BW_RATE)
> + return 0;
> +
> + has_min_rate = !!(mqprio->flags & TC_MQPRIO_F_MIN_RATE);
> + has_max_rate = !!(mqprio->flags & TC_MQPRIO_F_MAX_RATE);
> +
> + if (!has_min_rate && has_max_rate) {
> + NL_SET_ERR_MSG_MOD(extack, "min_rate is required with max_rate");
> + return -EOPNOTSUPP;
> + }
> +
> + if (!has_min_rate)
> + return 0;
> +
> + num_tc = mqprio->qopt.num_tc;
> +
> + for (i = num_tc - 1; i >= 0; i--) {
> + u32 ch_msk;
> +
> + if (mqprio->min_rate[i])
> + min_rate_msk |= BIT(i);
> + min_rate_total += mqprio->min_rate[i];
> +
> + if (has_max_rate) {
> + if (mqprio->max_rate[i])
> + max_rate_msk |= BIT(i);
> + max_rate_total += mqprio->max_rate[i];
> +
> + if (!mqprio->min_rate[i] && mqprio->max_rate[i]) {
> + NL_SET_ERR_MSG_FMT_MOD(extack,
> + "TX tc%d rate max>0 but min=0\n",
> + i);
> + return -EINVAL;
> + }
> +
> + if (mqprio->max_rate[i] &&
> + mqprio->max_rate[i] < mqprio->min_rate[i]) {
> + NL_SET_ERR_MSG_FMT_MOD(extack,
> + "TX tc%d rate min(%llu)>max(%llu)\n",
> + i, mqprio->min_rate[i],
> + mqprio->max_rate[i]);
> + return -EINVAL;
> + }
> + }
> +
> + ch_msk = GENMASK(num_tc - 1, i);
> + if ((min_rate_msk & BIT(i)) && (min_rate_msk ^ ch_msk)) {
> + NL_SET_ERR_MSG_FMT_MOD(extack,
> + "TX min rate limiting has to be enabled sequentially hi->lo tx_rate_msk%x\n",
> + min_rate_msk);
> + return -EINVAL;
> + }
> +
> + if ((max_rate_msk & BIT(i)) && (max_rate_msk ^ ch_msk)) {
> + NL_SET_ERR_MSG_FMT_MOD(extack,
> + "TX max rate limiting has to be enabled sequentially hi->lo tx_rate_msk%x\n",
> + max_rate_msk);
> + return -EINVAL;
> + }
> + }
> +
> + min_rate_total *= 8;
> + min_rate_total /= 1000 * 1000;
> + max_rate_total *= 8;
> + max_rate_total /= 1000 * 1000;
For consistency with other code doing the same algebra, you could use a
single statement for both '*' and '/'. You could also add an helper for
that conversion, as there are multiple use-case already.
> +
> + if (port->qos.link_speed != SPEED_UNKNOWN) {
> + if (min_rate_total > port->qos.link_speed) {
> + NL_SET_ERR_MSG_FMT_MOD(extack, "TX rate min %llu exceeds link speed %d\n",
> + min_rate_total, port->qos.link_speed);
> + return -EINVAL;
> + }
> +
> + if (max_rate_total > port->qos.link_speed) {
> + NL_SET_ERR_MSG_FMT_MOD(extack, "TX rate max %llu exceeds link speed %d\n",
> + max_rate_total, port->qos.link_speed);
> + return -EINVAL;
> + }
> + }
> +
> + p_mqprio->shaper_en = 1;
> + p_mqprio->max_rate_total = max_t(u64, min_rate_total, max_rate_total);
> +
> + return 0;
> +}
> +
> +static void am65_cpsw_reset_tc_mqprio(struct net_device *ndev)
> +{
> + struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
> + struct am65_cpsw_mqprio *p_mqprio = &port->qos.mqprio;
> + struct am65_cpsw_common *common = port->common;
> +
> + p_mqprio->shaper_en = 0;
> + p_mqprio->max_rate_total = 0;
> +
> + am65_cpsw_tx_pn_shaper_reset(port);
> + netdev_reset_tc(ndev);
> + netif_set_real_num_tx_queues(ndev, common->tx_ch_num);
> +
> + /* Reset all Queue priorities to 0 */
> + writel(0,
> + port->port_base + AM65_CPSW_PN_REG_TX_PRI_MAP);
No need to wrap the above statement on multiple lines.
> +}
> +
> +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));
> +
> + if (!num_tc) {
> + am65_cpsw_reset_tc_mqprio(ndev);
> + return 0;
> + }
> +
> + ret = pm_runtime_get_sync(common->dev);
> + if (ret < 0) {
> + pm_runtime_put_noidle(common->dev);
> + return ret;
> + }
> +
> + 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
> + * 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.
> + */
> +
> + for (tc = 0; tc < num_tc; tc++) {
> + /* For simplicity we assign the same priority (TCn) to all queues
> + * of a Traffic Class.
> + */
Please align the comment with the relevant code.
[...]
> +diff --git a/drivers/net/ethernet/ti/am65-cpsw-qos.h b/drivers/net/ethernet/ti/am65-cpsw-qos.h
> index 0cc2a3b3d7f9..5431fbf8b6e0 100644
> --- a/drivers/net/ethernet/ti/am65-cpsw-qos.h
> +++ b/drivers/net/ethernet/ti/am65-cpsw-qos.h
> @@ -9,6 +9,7 @@
> #include <net/pkt_sched.h>
>
> struct am65_cpsw_common;
> +struct am65_cpsw_port;
>
> struct am65_cpsw_est {
> int buf;
> @@ -16,6 +17,12 @@ struct am65_cpsw_est {
> struct tc_taprio_qopt_offload taprio;
> };
>
> +struct am65_cpsw_mqprio {
> + struct tc_mqprio_qopt_offload mqprio_hw;
> + u64 max_rate_total;
> + unsigned shaper_en:1;
Perhaps 'bool' instead?
Cheers,
Paolo
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