[dpdk-dev] [PATCH 2/2] build: add rdrand and rdseed checks to build

[Bruce Richardson <bruce.richardson@intel.com>]

The meson build never checked for the presence of rdrand and rdseed
instructions, while make build never checked for rdseed. Ensure builds
always have the appropriate checks - and therefore defines - for these
instructions. For runtime, we also add in rdseed to the list of known
bits returned from cpuid() instruction, so we can confirm its presence at
application init time.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 config/x86/meson.build                                | 5 ++++-
 lib/librte_eal/common/arch/x86/rte_cpuflags.c         | 1 +
 lib/librte_eal/common/include/arch/x86/rte_cpuflags.h | 1 +
 mk/rte.cpuflags.mk                                    | 4 ++++
 4 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/config/x86/meson.build b/config/x86/meson.build
index a650a1ca8..8b0fa3e6f 100644
--- a/config/x86/meson.build
+++ b/config/x86/meson.build
@@ -29,11 +29,14 @@ foreach f:base_flags
 endforeach
 
 optional_flags = ['AES', 'PCLMUL',
-		'AVX', 'AVX2', 'AVX512F']
+		'AVX', 'AVX2', 'AVX512F',
+		'RDRND', 'RDSEED']
 foreach f:optional_flags
 	if cc.get_define('__@0@__'.format(f), args: machine_args) == '1'
 		if f == 'PCLMUL' # special case flags with different defines
 			f = 'PCLMULQDQ'
+		elif f == 'RDRND'
+			f = 'RDRAND'
 		endif
 		dpdk_conf.set('RTE_MACHINE_CPUFLAG_' + f, 1)
 		compile_time_cpuflags += ['RTE_CPUFLAG_' + f]
diff --git a/lib/librte_eal/common/arch/x86/rte_cpuflags.c b/lib/librte_eal/common/arch/x86/rte_cpuflags.c
index 053612d6f..6492df556 100644
--- a/lib/librte_eal/common/arch/x86/rte_cpuflags.c
+++ b/lib/librte_eal/common/arch/x86/rte_cpuflags.c
@@ -108,6 +108,7 @@ const struct feature_entry rte_cpu_feature_table[] = {
 	FEAT_DEF(INVPCID, 0x00000007, 0, RTE_REG_EBX, 10)
 	FEAT_DEF(RTM, 0x00000007, 0, RTE_REG_EBX, 11)
 	FEAT_DEF(AVX512F, 0x00000007, 0, RTE_REG_EBX, 16)
+	FEAT_DEF(RDSEED, 0x00000007, 0, RTE_REG_EBX, 18)
 
 	FEAT_DEF(LAHF_SAHF, 0x80000001, 0, RTE_REG_ECX,  0)
 	FEAT_DEF(LZCNT, 0x80000001, 0, RTE_REG_ECX,  4)
diff --git a/lib/librte_eal/common/include/arch/x86/rte_cpuflags.h b/lib/librte_eal/common/include/arch/x86/rte_cpuflags.h
index 8315f6b69..25ba47b96 100644
--- a/lib/librte_eal/common/include/arch/x86/rte_cpuflags.h
+++ b/lib/librte_eal/common/include/arch/x86/rte_cpuflags.h
@@ -97,6 +97,7 @@ enum rte_cpu_flag_t {
 	RTE_CPUFLAG_INVPCID,                /**< INVPCID */
 	RTE_CPUFLAG_RTM,                    /**< Transactional memory */
 	RTE_CPUFLAG_AVX512F,                /**< AVX512F */
+	RTE_CPUFLAG_RDSEED,                 /**< RDSEED instruction */
 
 	/* (EAX 80000001h) ECX features */
 	RTE_CPUFLAG_LAHF_SAHF,              /**< LAHF_SAHF */
diff --git a/mk/rte.cpuflags.mk b/mk/rte.cpuflags.mk
index 541211c61..fa8753531 100644
--- a/mk/rte.cpuflags.mk
+++ b/mk/rte.cpuflags.mk
@@ -51,6 +51,10 @@ ifneq ($(filter $(AUTO_CPUFLAGS),__RDRND__),)
 CPUFLAGS += RDRAND
 endif
 
+ifneq ($(filter $(AUTO_CPUFLAGS),__RDSEED__),)
+CPUFLAGS += RDSEED
+endif
+
 ifneq ($(filter $(AUTO_CPUFLAGS),__FSGSBASE__),)
 CPUFLAGS += FSGSBASE
 endif
-- 
2.21.0