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From: Pavan Nikhilesh <pbhagavatula@caviumnetworks.com>
To: jerin.jacob@caviumnetworks.com, thomas@monjalon.net,
	konstantin.ananyev@intel.com
Cc: dev@dpdk.org, Pavan Nikhilesh <pbhagavatula@caviumnetworks.com>
Subject: [dpdk-dev]  [PATCH v2] eal: add macros to align value to multiple
Date: Tue, 20 Mar 2018 18:54:34 +0530	[thread overview]
Message-ID: <20180320132434.4825-1-pbhagavatula@caviumnetworks.com> (raw)
In-Reply-To: <20180314094100.12373-1-pbhagavatula@caviumnetworks.com>

Add macros to align given value to the multiple of the supplied
integer.

Signed-off-by: Pavan Nikhilesh <pbhagavatula@caviumnetworks.com>
---
 Common code needed for OcteonTx event timer device.

 v2 Changes:
 - Use paranthesis around mul (Konstantin).
 - Squash test_common patch.

 lib/librte_eal/common/include/rte_common.h | 16 ++++++++++++++++
 test/test/test_common.c                    | 12 ++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h
index c7803e41c..4469affb9 100644
--- a/lib/librte_eal/common/include/rte_common.h
+++ b/lib/librte_eal/common/include/rte_common.h
@@ -190,6 +190,22 @@ static void __attribute__((constructor(prio), used)) func(void)
  */
 #define RTE_ALIGN(val, align) RTE_ALIGN_CEIL(val, align)

+/**
+ * Macro to align a value to the multiple of given value. The resultant
+ * value will be of the same type as the first parameter and will be no lower
+ * than the first parameter.
+ */
+#define RTE_ALIGN_MUL_CEIL(v, mul) \
+	(((v + (typeof(v))(mul) - 1) / ((typeof(v))(mul))) * (typeof(v))(mul))
+
+/**
+ * Macro to align a value to the multiple of given value. The resultant
+ * value will be of the same type as the first parameter and will be no higher
+ * than the first parameter.
+ */
+#define RTE_ALIGN_MUL_FLOOR(v, mul) \
+	((v / ((typeof(v))(mul))) * (typeof(v))(mul))
+
 /**
  * Checks if a pointer is aligned to a given power-of-two value
  *
diff --git a/test/test/test_common.c b/test/test/test_common.c
index d0342430f..e43cba49b 100644
--- a/test/test/test_common.c
+++ b/test/test/test_common.c
@@ -128,6 +128,18 @@ test_align(void)
 				FAIL("rte_is_aligned");
 		}
 	}
+
+	for (p = 1; p <= MAX_NUM / 2; p++) {
+		for (i = 1; i <= MAX_NUM / 2; i++) {
+			val = RTE_ALIGN_MUL_CEIL(i, p);
+			if (val % p != 0 || val < i)
+				FAIL_ALIGN("RTE_ALIGN_MUL_CEIL", i, p);
+			val = RTE_ALIGN_MUL_FLOOR(i, p);
+			if (val % p != 0 || val > i)
+				FAIL_ALIGN("RTE_ALIGN_MUL_FLOOR", i, p);
+		}
+	}
+
 	return 0;
 }

--
2.16.2

  parent reply	other threads:[~2018-03-20 13:24 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-14  9:40 [dpdk-dev] [PATCH 1/2] " Pavan Nikhilesh
2018-03-14  9:41 ` [dpdk-dev] [PATCH 2/2] test: update common auto test Pavan Nikhilesh
2018-03-15 23:53   ` Thomas Monjalon
2018-03-16  8:56     ` Pavan Nikhilesh
2018-03-14 10:42 ` [dpdk-dev] [PATCH 1/2] eal: add macros to align value to multiple Ananyev, Konstantin
2018-03-16  8:41   ` Pavan Nikhilesh
2018-03-20 13:24 ` Pavan Nikhilesh [this message]
2018-04-04  9:14   ` [dpdk-dev] [PATCH v2] " Thomas Monjalon

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