> -----Original Message-----
> From: Marcin Danilewicz <marcinx.danilew...@intel.com>
> Sent: Thursday, April 7, 2022 3:52 PM
> To: dev@dpdk.org
> Cc: Ajmera, Megha <megha.ajm...@intel.com>
> Subject: [dpdk][PATCH 1/2] sched: enable/disable TC OV at runtime
>
> From: Megha Ajmera <megha.ajm...@intel.com>
>
> Added new API to enable or disable TC over subscription for best effort
> traffic class at subport level.
>
> By default TC OV is disabled for subport.
>
> Signed-off-by: Megha Ajmera <megha.ajm...@intel.com>
>
> diff --git a/lib/sched/rte_sched.c b/lib/sched/rte_sched.c index
> ec74bee939..1d05089d00 100644
> --- a/lib/sched/rte_sched.c
> +++ b/lib/sched/rte_sched.c
> @@ -155,6 +155,7 @@ struct rte_sched_subport {
> uint64_t tc_credits[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
>
> /* TC oversubscription */
> + uint8_t is_tc_ov_enabled;
> uint64_t tc_ov_wm;
> uint64_t tc_ov_wm_min;
> uint64_t tc_ov_wm_max;
> @@ -1165,6 +1166,45 @@ rte_sched_cman_config(struct rte_sched_port
> *port, } #endif
>
> +int
> +rte_sched_subport_tc_ov_config(struct rte_sched_port *port,
> + uint32_t subport_id,
> + bool tc_ov_enable)
> +{
> + struct rte_sched_subport *s;
> + struct rte_sched_subport_profile *profile;
> +
> + if (port == NULL) {
> + RTE_LOG(ERR, SCHED,
> + "%s: Incorrect value for parameter port\n",
> __func__);
> + return -EINVAL;
> + }
> +
> + if (subport_id >= port->n_subports_per_port) {
> + RTE_LOG(ERR, SCHED,
> + "%s: Incorrect value for parameter subport id\n",
> __func__);
> + return -EINVAL;
> + }
> +
> + s = port->subports[subport_id];
> + s->is_tc_ov_enabled = tc_ov_enable;
> +
> + if (s->is_tc_ov_enabled) {
> + /* TC oversubscription */
> + s->tc_ov_wm_min = port->mtu;
> + s->tc_ov_period_id = 0;
> + s->tc_ov = 0;
> + s->tc_ov_n = 0;
> + s->tc_ov_rate = 0;
> +
> + profile = port->subport_profiles + s->profile;
> + s->tc_ov_wm_max = rte_sched_time_ms_to_bytes(profile-
> >tc_period,
> + s->pipe_tc_be_rate_max);
> + s->tc_ov_wm = s->tc_ov_wm_max;
> + }
> + return 0;
> +}
This API should be invoked immediately after subport config function because
during pipe configuration, subport tc_ov parameters are updated based on the
pipe best effort tc parameters. With this condition, won't it be good to add
tc_ov_enable/disable flag to subport params instead of adding new API?
> +
> int
> rte_sched_subport_config(struct rte_sched_port *port,
> uint32_t subport_id,
> @@ -1317,12 +1357,8 @@ rte_sched_subport_config(struct rte_sched_port
> *port,
> for (i = 0; i < RTE_SCHED_PORT_N_GRINDERS; i++)
> s->grinder_base_bmp_pos[i] =
> RTE_SCHED_PIPE_INVALID;
>
> - /* TC oversubscription */
> - s->tc_ov_wm_min = port->mtu;
> - s->tc_ov_period_id = 0;
> - s->tc_ov = 0;
> - s->tc_ov_n = 0;
> - s->tc_ov_rate = 0;
> + /* TC over-subscription is disabled by default */
> + s->is_tc_ov_enabled = 0;
> }
>
> {
> @@ -1342,9 +1378,6 @@ rte_sched_subport_config(struct rte_sched_port
> *port,
> else
> profile->tc_credits_per_period[i] = 0;
>
> - s->tc_ov_wm_max = rte_sched_time_ms_to_bytes(profile-
> >tc_period,
> - s-
> >pipe_tc_be_rate_max);
> - s->tc_ov_wm = s->tc_ov_wm_max;
> s->profile = subport_profile_id;
>
> }
> @@ -1417,17 +1450,20 @@ rte_sched_pipe_config(struct rte_sched_port
> *port,
> double pipe_tc_be_rate =
> (double) params-
> >tc_credits_per_period[RTE_SCHED_TRAFFIC_CLASS_BE]
> / (double) params->tc_period;
> - uint32_t tc_be_ov = s->tc_ov;
>
> - /* Unplug pipe from its subport */
> - s->tc_ov_n -= params->tc_ov_weight;
> - s->tc_ov_rate -= pipe_tc_be_rate;
> - s->tc_ov = s->tc_ov_rate > subport_tc_be_rate;
> + if (s->is_tc_ov_enabled) {
> + uint32_t tc_be_ov = s->tc_ov;
>
> - if (s->tc_ov != tc_be_ov) {
> - RTE_LOG(DEBUG, SCHED,
> - "Subport %u Best-effort TC oversubscription
> is OFF (%.4lf >= %.4lf)\n",
> - subport_id, subport_tc_be_rate, s-
> >tc_ov_rate);
> + /* Unplug pipe from its subport */
> + s->tc_ov_n -= params->tc_ov_weight;
> + s->tc_ov_rate -= pipe_tc_be_rate;
> + s->tc_ov = s->tc_ov_rate > subport_tc_be_rate;
> +
> + if (s->tc_ov != tc_be_ov) {
> + RTE_LOG(DEBUG, SCHED,
> + "Subport %u Best-effort TC
> oversubscription is OFF (%.4lf >= %.4lf)\n",
> + subport_id, subport_tc_be_rate, s-
> >tc_ov_rate);
> + }
> }
>
> /* Reset the pipe */
> @@ -1460,19 +1496,22 @@ rte_sched_pipe_config(struct rte_sched_port
> *port,
> double pipe_tc_be_rate =
> (double) params-
> >tc_credits_per_period[RTE_SCHED_TRAFFIC_CLASS_BE]
> / (double) params->tc_period;
> - uint32_t tc_be_ov = s->tc_ov;
>
> - s->tc_ov_n += params->tc_ov_weight;
> - s->tc_ov_rate += pipe_tc_be_rate;
> - s->tc_ov = s->tc_ov_rate > subport_tc_be_rate;
> + if (s->is_tc_ov_enabled) {
> + uint32_t tc_be_ov = s->tc_ov;
>
> - if (s->tc_ov != tc_be_ov) {
> - RTE_LOG(DEBUG, SCHED,
> - "Subport %u Best effort TC oversubscription
> is ON (%.4lf < %.4lf)\n",
> - subport_id, subport_tc_be_rate, s-
> >tc_ov_rate);
> + s->tc_ov_n += params->tc_ov_weight;
> + s->tc_ov_rate += pipe_tc_be_rate;
> + s->tc_ov = s->tc_ov_rate > subport_tc_be_rate;
> +
> + if (s->tc_ov != tc_be_ov) {
> + RTE_LOG(DEBUG, SCHED,
> + "Subport %u Best effort TC
> oversubscription is ON (%.4lf < %.4lf)\n",
> + subport_id, subport_tc_be_rate, s-
> >tc_ov_rate);
> + }
> + p->tc_ov_period_id = s->tc_ov_period_id;
> + p->tc_ov_credits = s->tc_ov_wm;
> }
> - p->tc_ov_period_id = s->tc_ov_period_id;
> - p->tc_ov_credits = s->tc_ov_wm;
> }
>
