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List:       dpdk-dev
Subject:    [dpdk-dev] [RFC 06/23] eal-common: introduce a way to query cpu support
From:       Aaron Conole <aconole () redhat ! com>
Date:       2016-12-30 15:26:03
Message-ID: 1483111580-5397-7-git-send-email-aconole () redhat ! com
[Download RAW message or body]

This adds a new API to check for the eal cpu versions.

Signed-off-by: Aaron Conole <aconole@redhat.com>
---
 lib/librte_eal/common/eal_common_cpuflags.c          | 13 +++++++++++--
 lib/librte_eal/common/include/generic/rte_cpuflags.h |  9 +++++++++
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/lib/librte_eal/common/eal_common_cpuflags.c \
b/lib/librte_eal/common/eal_common_cpuflags.c index b5f76f7..2c2127b 100644
--- a/lib/librte_eal/common/eal_common_cpuflags.c
+++ b/lib/librte_eal/common/eal_common_cpuflags.c
@@ -43,6 +43,13 @@
 void
 rte_cpu_check_supported(void)
 {
+	if (!rte_cpu_is_supported())
+		exit(1);
+}
+
+bool
+rte_cpu_is_supported(void)
+{
 	/* This is generated at compile-time by the build system */
 	static const enum rte_cpu_flag_t compile_time_flags[] = {
 			RTE_COMPILE_TIME_CPUFLAGS
@@ -57,14 +64,16 @@ rte_cpu_check_supported(void)
 			fprintf(stderr,
 				"ERROR: CPU feature flag lookup failed with error %d\n",
 				ret);
-			exit(1);
+			return false;
 		}
 		if (!ret) {
 			fprintf(stderr,
 			        "ERROR: This system does not support \"%s\".\n"
 			        "Please check that RTE_MACHINE is set correctly.\n",
 			        rte_cpu_get_flag_name(compile_time_flags[i]));
-			exit(1);
+			return false;
 		}
 	}
+
+	return true;
 }
diff --git a/lib/librte_eal/common/include/generic/rte_cpuflags.h \
b/lib/librte_eal/common/include/generic/rte_cpuflags.h index 71321f3..e4342ad 100644
--- a/lib/librte_eal/common/include/generic/rte_cpuflags.h
+++ b/lib/librte_eal/common/include/generic/rte_cpuflags.h
@@ -40,6 +40,7 @@
  */
 
 #include <errno.h>
+#include <stdbool.h>
 
 /**
  * Enumeration of all CPU features supported
@@ -82,4 +83,12 @@ rte_cpu_get_flag_enabled(enum rte_cpu_flag_t feature);
 void
 rte_cpu_check_supported(void);
 
+/**
+ * This function checks that the currently used CPU supports the CPU features
+ * that were specified at compile time. It is called automatically within the
+ * EAL, so does not need to be used by applications.  This version returns a
+ * result so that decisions may be made (for instance, graceful shutdowns).
+ */
+bool
+rte_cpu_is_supported(void);
 #endif /* _RTE_CPUFLAGS_H_ */
-- 
2.7.4


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