[dpdk-dev] [PATCH v2 1/6] eal: change rte pause as architecture specific function
Jerin Jacob
jerin.jacob at caviumnetworks.com
Mon Jun 5 10:58:38 CEST 2017
Each architecture may have different instructions for optimized
and power consumption aware rte_pause() implementation.
Signed-off-by: Jerin Jacob <jerin.jacob at caviumnetworks.com>
---
doc/api/doxy-api-index.md | 3 +-
lib/librte_eal/common/Makefile | 2 +-
lib/librte_eal/common/include/generic/rte_pause.h | 52 +++++++++++++++++++++++
3 files changed, 55 insertions(+), 2 deletions(-)
create mode 100644 lib/librte_eal/common/include/generic/rte_pause.h
diff --git a/doc/api/doxy-api-index.md b/doc/api/doxy-api-index.md
index f5f1f199f..a6f3fedd4 100644
--- a/doc/api/doxy-api-index.md
+++ b/doc/api/doxy-api-index.md
@@ -77,7 +77,8 @@ There are many libraries, so their headers may be grouped by topics:
[SIMD] (@ref rte_vect.h),
[byte order] (@ref rte_byteorder.h),
[CPU flags] (@ref rte_cpuflags.h),
- [I/O access] (@ref rte_io.h)
+ [I/O access] (@ref rte_io.h),
+ [cpu pause] (@ref rte_pause.h)
- **CPU multicore**:
[interrupts] (@ref rte_interrupts.h),
diff --git a/lib/librte_eal/common/Makefile b/lib/librte_eal/common/Makefile
index a5bd1089a..fb1e2aab6 100644
--- a/lib/librte_eal/common/Makefile
+++ b/lib/librte_eal/common/Makefile
@@ -44,7 +44,7 @@ INC += rte_malloc.h rte_keepalive.h rte_time.h
GENERIC_INC := rte_atomic.h rte_byteorder.h rte_cycles.h rte_prefetch.h
GENERIC_INC += rte_spinlock.h rte_memcpy.h rte_cpuflags.h rte_rwlock.h
-GENERIC_INC += rte_vect.h rte_io.h
+GENERIC_INC += rte_vect.h rte_io.h rte_pause.h
# defined in mk/arch/$(RTE_ARCH)/rte.vars.mk
ARCH_DIR ?= $(RTE_ARCH)
diff --git a/lib/librte_eal/common/include/generic/rte_pause.h b/lib/librte_eal/common/include/generic/rte_pause.h
new file mode 100644
index 000000000..9625e580c
--- /dev/null
+++ b/lib/librte_eal/common/include/generic/rte_pause.h
@@ -0,0 +1,52 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2017 Cavium. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Cavium nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _RTE_PAUSE_H_
+#define _RTE_PAUSE_H_
+
+/**
+ * @file
+ *
+ * CPU pause operation.
+ *
+ */
+
+/**
+ * Pause CPU execution for a short while
+ *
+ * This call is intended for tight loops which poll a shared resource or wait
+ * for an event. A short pause within the loop may reduce the power consumption.
+ */
+static inline void rte_pause(void);
+
+#endif /* _RTE_PAUSE_H_ */
--
2.13.0
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