dpdk/dpdk-16.04_patches/0005-Allow-applications-to-override-rte_delay_us.patch

From 3432c140c9c51e671a4d58bb428d5852426add1f Mon Sep 17 00:00:00 2001
From: "Todd Foggoa (tfoggoa)" <tfoggoa@cisco.com>
Date: Wed, 3 Feb 2016 08:35:27 -0800
Subject: [PATCH 5/6] Allow applications to override rte_delay_us()

Some applications may wish to define their own implentation of
usec delay other than the existing blocking one. The default
behavior remains unchanged.

Signed-off-by: Todd Foggoa (tfoggoa) <tfoggoa@cisco.com>
---
 lib/librte_eal/common/eal_common_timer.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/lib/librte_eal/common/eal_common_timer.c b/lib/librte_eal/common/eal_common_timer.c
index c4227cd..cc26b91 100644
--- a/lib/librte_eal/common/eal_common_timer.c
+++ b/lib/librte_eal/common/eal_common_timer.c
@@ -47,9 +47,21 @@
 /* The frequency of the RDTSC timer resolution */
 static uint64_t eal_tsc_resolution_hz;
 
+/* Allow an override of the rte_delay_us function */
+int rte_delay_us_override (unsigned us) __attribute__((weak));
+
+int
+rte_delay_us_override(__attribute__((unused)) unsigned us)
+{
+	return 0;
+}
+
 void
 rte_delay_us(unsigned us)
 {
+	if (rte_delay_us_override(us))
+		return;
+
 	const uint64_t start = rte_get_timer_cycles();
 	const uint64_t ticks = (uint64_t)us * rte_get_timer_hz() / 1E6;
 	while ((rte_get_timer_cycles() - start) < ticks)
-- 
2.7.4