[dpdk-stable] patch 'app/eventdev: fix timeout accuracy' has been queued to stable release 20.11.2

[Xueming Li]

Hi,

FYI, your patch has been queued to stable release 20.11.2

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 05/12/21. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/steevenlee/dpdk

This queued commit can be viewed at:
https://github.com/steevenlee/dpdk/commit/dc7e8df00fad3c0e072401632b40798b69ca912a

Thanks.

Xueming Li <xuemingl at nvidia.com>

---
>From dc7e8df00fad3c0e072401632b40798b69ca912a Mon Sep 17 00:00:00 2001
From: Pavan Nikhilesh <pbhagavatula at marvell.com>
Date: Thu, 25 Feb 2021 17:31:43 +0530
Subject: [PATCH] app/eventdev: fix timeout accuracy
Cc: Luca Boccassi <bluca at debian.org>

[ upstream commit 626b12a8d3bb018f7fc9e2eae356a375fb2d38dc ]

Round timeout ticks when converting from nanoseconds, this prevents
loss of accuracy and deviation from requested timeout value.

Fixes: d008f20bce23 ("app/eventdev: add event timer adapter as a producer")

Signed-off-by: Pavan Nikhilesh <pbhagavatula at marvell.com>
Reviewed-by: Erik Gabriel Carrillo <erik.g.carrillo at intel.com>
---
 app/test-eventdev/test_perf_common.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/app/test-eventdev/test_perf_common.c b/app/test-eventdev/test_perf_common.c
index 955edb7526..2fe15ed447 100644
--- a/app/test-eventdev/test_perf_common.c
+++ b/app/test-eventdev/test_perf_common.c
@@ -2,6 +2,8 @@
  * Copyright(c) 2017 Cavium, Inc
  */
 
+#include <math.h>
+
 #include "test_perf_common.h"
 
 int
@@ -95,11 +97,13 @@ perf_event_timer_producer(void *arg)
 	uint64_t timeout_ticks = opt->expiry_nsec / opt->timer_tick_nsec;
 
 	memset(&tim, 0, sizeof(struct rte_event_timer));
-	timeout_ticks = opt->optm_timer_tick_nsec ?
-			(timeout_ticks * opt->timer_tick_nsec)
-			/ opt->optm_timer_tick_nsec : timeout_ticks;
+	timeout_ticks =
+		opt->optm_timer_tick_nsec
+			? ceil((double)(timeout_ticks * opt->timer_tick_nsec) /
+			       opt->optm_timer_tick_nsec)
+			: timeout_ticks;
 	timeout_ticks += timeout_ticks ? 0 : 1;
-	tim.ev.event_type =  RTE_EVENT_TYPE_TIMER;
+	tim.ev.event_type = RTE_EVENT_TYPE_TIMER;
 	tim.ev.op = RTE_EVENT_OP_NEW;
 	tim.ev.sched_type = t->opt->sched_type_list[0];
 	tim.ev.queue_id = p->queue_id;
@@ -159,11 +163,13 @@ perf_event_timer_producer_burst(void *arg)
 	uint64_t timeout_ticks = opt->expiry_nsec / opt->timer_tick_nsec;
 
 	memset(&tim, 0, sizeof(struct rte_event_timer));
-	timeout_ticks = opt->optm_timer_tick_nsec ?
-			(timeout_ticks * opt->timer_tick_nsec)
-			/ opt->optm_timer_tick_nsec : timeout_ticks;
+	timeout_ticks =
+		opt->optm_timer_tick_nsec
+			? ceil((double)(timeout_ticks * opt->timer_tick_nsec) /
+			       opt->optm_timer_tick_nsec)
+			: timeout_ticks;
 	timeout_ticks += timeout_ticks ? 0 : 1;
-	tim.ev.event_type =  RTE_EVENT_TYPE_TIMER;
+	tim.ev.event_type = RTE_EVENT_TYPE_TIMER;
 	tim.ev.op = RTE_EVENT_OP_NEW;
 	tim.ev.sched_type = t->opt->sched_type_list[0];
 	tim.ev.queue_id = p->queue_id;
-- 
2.25.1

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2021-05-10 23:59:30.905146200 +0800
+++ 0167-app-eventdev-fix-timeout-accuracy.patch	2021-05-10 23:59:26.610000000 +0800
@@ -1 +1 @@
-From 626b12a8d3bb018f7fc9e2eae356a375fb2d38dc Mon Sep 17 00:00:00 2001
+From dc7e8df00fad3c0e072401632b40798b69ca912a Mon Sep 17 00:00:00 2001
@@ -4,0 +5,3 @@
+Cc: Luca Boccassi <bluca at debian.org>
+
+[ upstream commit 626b12a8d3bb018f7fc9e2eae356a375fb2d38dc ]
@@ -10 +12,0 @@
-Cc: stable at dpdk.org
@@ -19 +21 @@
-index 34cded3739..cc100650c2 100644
+index 955edb7526..2fe15ed447 100644