From: Stephen Hemminger <stephen@networkplumber.org>
Date: Thu, 16 Jul 2015 21:34:32 +0000 (-0700)
Subject: sched: make RED optional at runtime
X-Git-Tag: spdx-start~8718
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=041f312da5c8aec4de13635b7677e5fa80fea46b;p=dpdk.git

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 95dee27301..3b5acd11b8 100644
--- 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;