sched: make RED optional at runtime

Want to be able to build with RTE_SCHED_RED enabled but
allow disabling RED on a per-queue basis at runtime.

RED is disabled unless min/max thresholds set.

Signed-off-by: Stephen Hemmminger <stephen@networkplumber.org>
Acked-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>

diff --git a/lib/librte_sched/rte_sched.c b/lib/librte_sched/rte_sched.c
index 95dee27..3b5acd1 100644 (file)
--- a/lib/librte_sched/rte_sched.c
+++ b/lib/librte_sched/rte_sched.c
@@ -636,6 +636,12 @@ rte_sched_port_config(struct rte_sched_port_params *params)
                uint32_t j;
 
                for (j = 0; j < e_RTE_METER_COLORS; j++) {
+                       /* if min/max are both zero, then RED is disabled */
+                       if ((params->red_params[i][j].min_th |
+                            params->red_params[i][j].max_th) == 0) {
+                               continue;
+                       }
+
                        if (rte_red_config_init(&port->red_config[i][j],
                                params->red_params[i][j].wq_log2,
                                params->red_params[i][j].min_th,
@@ -1069,6 +1075,9 @@ rte_sched_port_red_drop(struct rte_sched_port *port, struct rte_mbuf *pkt, uint3
        color = rte_sched_port_pkt_read_color(pkt);
        red_cfg = &port->red_config[tc_index][color];
 
+       if ((red_cfg->min_th | red_cfg->max_th) == 0)
+               return 0;
+
        qe = port->queue_extra + qindex;
        red = &qe->red;