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dpdk: enable CPU feature detection.

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This commit implements a method to retrieve the CPU ISA capabilities.
These ISA capabilities can be used in OVS to at runtime select a function
implementation to make the best use of the available ISA on the CPU.

Signed-off-by: Harry van Haaren <harry.van.haaren@intel.com>
Acked-by: William Tu <u9012063@gmail.com>
Signed-off-by: Ian Stokes <ian.stokes@intel.com>
This commit is contained in:
Harry van Haaren
2020-07-13 13:42:13 +01:00
committed by Ian Stokes
parent 9ff7cabfd7
commit b250b39a7a
3 changed files with 41 additions and 0 deletions
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30
lib/dpdk.c
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@@ -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 +514,35 @@ 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 true; \
} \
} while (0)
bool
dpdk_get_cpu_has_isa(const char *arch, const char *feature)
{
/* Ensure Arch is x86_64. */
if (strncmp(arch, "x86_64", 6) != 0) {
return false;
}
#if __x86_64__
/* CPU flags only defined for the architecture that support it. */
CHECK_CPU_FEATURE(feature, "avx512f", RTE_CPUFLAG_AVX512F);
CHECK_CPU_FEATURE(feature, "bmi2", RTE_CPUFLAG_BMI2);
#endif
VLOG_WARN("Unknown CPU arch,feature: %s,%s. Returning not supported.\n",
arch, feature);
return false;
}
void
dpdk_status(const struct ovsrec_open_vswitch *cfg)
{