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dpdk: allow applications to override rte delay

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

Change-Id: I6cb626e7a5d9d985928aa266e522a849d264a2b2
Signed-off-by: Todd Foggoa (tfoggoa) <tfoggoa@cisco.com>
Signed-off-by: Ray Kinsella <ray.kinsella@intel.com>
This commit is contained in:
Ray
2016-08-09 18:35:13 +01:00
committed by Damjan Marion
parent 861bd216eb
commit 3a9b5d97ca
1 changed files with 43 additions and 0 deletions
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43
dpdk/dpdk-16.07_patches/0006-Allow-applications-to-override-rte_delay_us.patch Normal file
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@ -0,0 +1,43 @@
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