dpdk/dpdk-2.2.0_patches/0007-Allow-applications-to-override-rte_delay_us.patch

   1 From 5d03f3ca8ddc7313de59e54d83912b1f3c049170 Mon Sep 17 00:00:00 2001
   2 From: "Todd Foggoa (tfoggoa)" <tfoggoa@cisco.com>
   3 Date: Wed, 3 Feb 2016 08:35:27 -0800
   4 Subject: [PATCH 7/8] Allow applications to override rte_delay_us()
   5
   6 Some applications may wish to define their own implentation of
   7 usec delay other than the existing blocking one. The default
   8 behavior remains unchanged.
   9
  10 Signed-off-by: Todd Foggoa (tfoggoa) <tfoggoa@cisco.com>
  11 ---
  12  lib/librte_eal/common/eal_common_timer.c | 12 ++++++++++++
  13  1 file changed, 12 insertions(+)
  14
  15 diff --git a/lib/librte_eal/common/eal_common_timer.c b/lib/librte_eal/common/eal_common_timer.c
  16 index 72371b8..5189fa5 100644
  17 --- a/lib/librte_eal/common/eal_common_timer.c
  18 +++ b/lib/librte_eal/common/eal_common_timer.c
  19 @@ -47,9 +47,21 @@
  20  /* The frequency of the RDTSC timer resolution */
  21  static uint64_t eal_tsc_resolution_hz;
  22
  23 +/* Allow an override of the rte_delay_us function */
  24 +int rte_delay_us_override (unsigned us) __attribute__((weak));
  25 +
  26 +int
  27 +rte_delay_us_override(__attribute__((unused)) unsigned us)
  28 +{
  29 +       return 0;
  30 +}
  31 +
  32  void
  33  rte_delay_us(unsigned us)
  34  {
  35 +       if (rte_delay_us_override(us))
  36 +               return;
  37 +
  38         const uint64_t start = rte_get_timer_cycles();
  39         const uint64_t ticks = (uint64_t)us * rte_get_timer_hz() / 1E6;
  40         while ((rte_get_timer_cycles() - start) < ticks)
  41 --
  42 2.2.1
  43