This commit implements a method to retrieve the CPU ISA capabilities.
These ISA capabilities can be used in OVS to select a function
implementation that uses the best ISA available on the CPU being used.
Signed-off-by: Harry van Haaren <harry.van.haa...@intel.com>
---
lib/dpdk-stub.c | 13 +++++++++++++
lib/dpdk.c | 27 +++++++++++++++++++++++++++
lib/dpdk.h | 2 ++
3 files changed, 42 insertions(+)
diff --git a/lib/dpdk-stub.c b/lib/dpdk-stub.c
index c332c217c..9935f3d2b 100644
--- a/lib/dpdk-stub.c
+++ b/lib/dpdk-stub.c
@@ -79,6 +79,19 @@ print_dpdk_version(void)
{
}
+int
+dpdk_get_cpu_has_isa(const char *arch OVS_UNUSED,
+ const char *feature OVS_UNUSED)
+{
+ static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
+ if (ovsthread_once_start(&once)) {
+ VLOG_ERR("DPDK not supported in this version of Open vSwitch, "
+ "cannot use CPU flag based optimizations");
+ ovsthread_once_done(&once);
+ }
+ return 0;
+}
+
void
dpdk_status(const struct ovsrec_open_vswitch *cfg)
{
diff --git a/lib/dpdk.c b/lib/dpdk.c
index 31450d470..3bea65859 100644
--- a/lib/dpdk.c
+++ b/lib/dpdk.c
@@ -22,6 +22,7 @@
#include <sys/stat.h>
#include <getopt.h>
+#include <rte_cpuflags.h>
#include <rte_errno.h>
#include <rte_log.h>
#include <rte_memzone.h>
@@ -513,6 +514,32 @@ print_dpdk_version(void)
puts(rte_version());
}
+#define CHECK_CPU_FEATURE(feature, name_str, RTE_CPUFLAG) \
+ do { \
+ if (strncmp(feature, name_str, strlen(name_str)) == 0) { \
+ int has_isa = rte_cpu_get_flag_enabled(RTE_CPUFLAG); \
+ VLOG_DBG("CPU flag %s, available %s\n", name_str, \
+ has_isa ? "yes" : "no"); \
+ return has_isa; \
+ } \
+ } while (0)
+
+int
+dpdk_get_cpu_has_isa(const char *arch, const char *feature)
+{
+ /* Ensure Arch is x86_64 */
+ if (strncmp(arch, "x86_64", 6) != 0) {
+ return 0;
+ }
+
+ CHECK_CPU_FEATURE(feature, "avx512f", RTE_CPUFLAG_AVX512F);
+ CHECK_CPU_FEATURE(feature, "bmi2", RTE_CPUFLAG_BMI2);
+
+ VLOG_WARN("Unknown CPU arch,feature: %s,%s. Returning not supported.\n",
+ arch, feature);
+ return 0;
+}
+
void
dpdk_status(const struct ovsrec_open_vswitch *cfg)
{
diff --git a/lib/dpdk.h b/lib/dpdk.h
index 736a64279..818dfcbba 100644
--- a/lib/dpdk.h
+++ b/lib/dpdk.h
@@ -44,4 +44,6 @@ bool dpdk_per_port_memory(void);
bool dpdk_available(void);
void print_dpdk_version(void);
void dpdk_status(const struct ovsrec_open_vswitch *);
+int dpdk_get_cpu_has_isa(const char * arch, const char *feature);
+
#endif /* dpdk.h */
--
2.17.1
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