[dpdk-dev] [PATCH 1/2] acl: remove use of weak functions

[Bruce Richardson]

Weak functions don't work well with static libraries and require the use of
"whole-archive" flag to ensure that the correct function is used when
linking. Since the weak functions are only used as placeholders within
this library alone, we can replace them with non-weak functions using
preprocessor ifdefs.

Signed-off-by: Bruce Richardson <bruce.richardson at intel.com>
---
 lib/librte_acl/meson.build |  7 ++++++-
 lib/librte_acl/rte_acl.c   | 18 ++++++++++++++----
 mk/rte.app.mk              |  3 ---
 3 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/lib/librte_acl/meson.build b/lib/librte_acl/meson.build
index 2207dbafe..98ece7d85 100644
--- a/lib/librte_acl/meson.build
+++ b/lib/librte_acl/meson.build
@@ -6,7 +6,7 @@ sources = files('acl_bld.c', 'acl_gen.c', 'acl_run_scalar.c',
 		'rte_acl.c', 'tb_mem.c')
 headers = files('rte_acl.h', 'rte_acl_osdep.h')
 
-if arch_subdir == 'x86'
+if dpdk_conf.has('RTE_ARCH_X86')
 	sources += files('acl_run_sse.c')
 
 	# compile AVX2 version if either:
@@ -28,4 +28,9 @@ if arch_subdir == 'x86'
 		cflags += '-DCC_AVX2_SUPPORT'
 	endif
 
+elif dpdk_conf.has('RTE_ARCH_ARM') or dpdk_conf.has('RTE_ARCH_ARM64')
+	cflags += '-flax-vector-conversions'
+	sources += files('acl_run_neon.c')
+elif dpdk_conf.has('RTE_ARCH_PPC_64')
+	sources += files('acl_run_altivec.c')
 endif
diff --git a/lib/librte_acl/rte_acl.c b/lib/librte_acl/rte_acl.c
index c436a9bfd..fd5bd5e4e 100644
--- a/lib/librte_acl/rte_acl.c
+++ b/lib/librte_acl/rte_acl.c
@@ -13,11 +13,13 @@ static struct rte_tailq_elem rte_acl_tailq = {
 };
 EAL_REGISTER_TAILQ(rte_acl_tailq)
 
+#ifndef RTE_ARCH_X86
+#ifndef CC_AVX2_SUPPORT
 /*
  * If the compiler doesn't support AVX2 instructions,
  * then the dummy one would be used instead for AVX2 classify method.
  */
-__rte_weak int
+int
 rte_acl_classify_avx2(__rte_unused const struct rte_acl_ctx *ctx,
 	__rte_unused const uint8_t **data,
 	__rte_unused uint32_t *results,
@@ -26,8 +28,9 @@ rte_acl_classify_avx2(__rte_unused const struct rte_acl_ctx *ctx,
 {
 	return -ENOTSUP;
 }
+#endif
 
-__rte_weak int
+int
 rte_acl_classify_sse(__rte_unused const struct rte_acl_ctx *ctx,
 	__rte_unused const uint8_t **data,
 	__rte_unused uint32_t *results,
@@ -36,8 +39,11 @@ rte_acl_classify_sse(__rte_unused const struct rte_acl_ctx *ctx,
 {
 	return -ENOTSUP;
 }
+#endif
 
-__rte_weak int
+#ifndef RTE_ARCH_ARM
+#ifndef RTE_ARCH_ARM64
+int
 rte_acl_classify_neon(__rte_unused const struct rte_acl_ctx *ctx,
 	__rte_unused const uint8_t **data,
 	__rte_unused uint32_t *results,
@@ -46,8 +52,11 @@ rte_acl_classify_neon(__rte_unused const struct rte_acl_ctx *ctx,
 {
 	return -ENOTSUP;
 }
+#endif
+#endif
 
-__rte_weak int
+#ifndef RTE_ARCH_PPC_64
+int
 rte_acl_classify_altivec(__rte_unused const struct rte_acl_ctx *ctx,
 	__rte_unused const uint8_t **data,
 	__rte_unused uint32_t *results,
@@ -56,6 +65,7 @@ rte_acl_classify_altivec(__rte_unused const struct rte_acl_ctx *ctx,
 {
 	return -ENOTSUP;
 }
+#endif
 
 static const rte_acl_classify_t classify_fns[] = {
 	[RTE_ACL_CLASSIFY_DEFAULT] = rte_acl_classify_scalar,
diff --git a/mk/rte.app.mk b/mk/rte.app.mk
index 7d994bece..fdec636b4 100644
--- a/mk/rte.app.mk
+++ b/mk/rte.app.mk
@@ -46,10 +46,7 @@ _LDLIBS-$(CONFIG_RTE_LIBRTE_DISTRIBUTOR)    += -lrte_distributor
 _LDLIBS-$(CONFIG_RTE_LIBRTE_IP_FRAG)        += -lrte_ip_frag
 _LDLIBS-$(CONFIG_RTE_LIBRTE_METER)          += -lrte_meter
 _LDLIBS-$(CONFIG_RTE_LIBRTE_LPM)            += -lrte_lpm
-# librte_acl needs --whole-archive because of weak functions
-_LDLIBS-$(CONFIG_RTE_LIBRTE_ACL)            += --whole-archive
 _LDLIBS-$(CONFIG_RTE_LIBRTE_ACL)            += -lrte_acl
-_LDLIBS-$(CONFIG_RTE_LIBRTE_ACL)            += --no-whole-archive
 _LDLIBS-$(CONFIG_RTE_LIBRTE_TELEMETRY)      += --no-as-needed
 _LDLIBS-$(CONFIG_RTE_LIBRTE_TELEMETRY)      += --whole-archive
 _LDLIBS-$(CONFIG_RTE_LIBRTE_TELEMETRY)      += -lrte_telemetry -ljansson
-- 
2.20.1