[dpdk-dev] [PATCH v3 3/3] eal/stack: enable lock-free stack for aarch64

[Phil Yang <phil.yang@arm.com>]

Enable both c11 atomic and non c11 atomic lock-free stack for aarch64.

Signed-off-by: Phil Yang <phil.yang@arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Tested-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
---
 doc/guides/prog_guide/env_abstraction_layer.rst | 4 ++--
 doc/guides/rel_notes/release_19_08.rst          | 3 +++
 lib/librte_stack/rte_stack_lf_c11.h             | 4 ++--
 lib/librte_stack/rte_stack_lf_generic.h         | 4 ++--
 4 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/doc/guides/prog_guide/env_abstraction_layer.rst b/doc/guides/prog_guide/env_abstraction_layer.rst
index f15bcd9..d569f95 100644
--- a/doc/guides/prog_guide/env_abstraction_layer.rst
+++ b/doc/guides/prog_guide/env_abstraction_layer.rst
@@ -592,8 +592,8 @@ Known Issues
   Alternatively, applications can use the lock-free stack mempool handler. When
   considering this handler, note that:
 
-  - It is currently limited to the x86_64 platform, because it uses an
-    instruction (16-byte compare-and-swap) that is not yet available on other
+  - It is currently limited to the aarch64 and x86_64 platforms, because it uses
+    an instruction (16-byte compare-and-swap) that is not yet available on other
     platforms.
   - It has worse average-case performance than the non-preemptive rte_ring, but
     software caching (e.g. the mempool cache) can mitigate this by reducing the
diff --git a/doc/guides/rel_notes/release_19_08.rst b/doc/guides/rel_notes/release_19_08.rst
index 3da2667..e2e00b9 100644
--- a/doc/guides/rel_notes/release_19_08.rst
+++ b/doc/guides/rel_notes/release_19_08.rst
@@ -99,6 +99,9 @@ New Features
   Updated ``librte_telemetry`` to fetch the global metrics from the
   ``librte_metrics`` library.
 
+* **Added Lock-free Stack for aarch64.**
+
+  The lock-free stack implementation is enabled for aarch64 platforms.
 
 Removed Items
 -------------
diff --git a/lib/librte_stack/rte_stack_lf_c11.h b/lib/librte_stack/rte_stack_lf_c11.h
index 3d677ae..67c21fd 100644
--- a/lib/librte_stack/rte_stack_lf_c11.h
+++ b/lib/librte_stack/rte_stack_lf_c11.h
@@ -36,7 +36,7 @@ __rte_stack_lf_push_elems(struct rte_stack_lf_list *list,
 			  struct rte_stack_lf_elem *last,
 			  unsigned int num)
 {
-#ifndef RTE_ARCH_X86_64
+#if !defined(RTE_ARCH_X86_64) && !defined(RTE_ARCH_ARM64)
 	RTE_SET_USED(first);
 	RTE_SET_USED(last);
 	RTE_SET_USED(list);
@@ -88,7 +88,7 @@ __rte_stack_lf_pop_elems(struct rte_stack_lf_list *list,
 			 void **obj_table,
 			 struct rte_stack_lf_elem **last)
 {
-#ifndef RTE_ARCH_X86_64
+#if !defined(RTE_ARCH_X86_64) && !defined(RTE_ARCH_ARM64)
 	RTE_SET_USED(obj_table);
 	RTE_SET_USED(last);
 	RTE_SET_USED(list);
diff --git a/lib/librte_stack/rte_stack_lf_generic.h b/lib/librte_stack/rte_stack_lf_generic.h
index 3182151..488fd9f 100644
--- a/lib/librte_stack/rte_stack_lf_generic.h
+++ b/lib/librte_stack/rte_stack_lf_generic.h
@@ -36,7 +36,7 @@ __rte_stack_lf_push_elems(struct rte_stack_lf_list *list,
 			  struct rte_stack_lf_elem *last,
 			  unsigned int num)
 {
-#ifndef RTE_ARCH_X86_64
+#if !defined(RTE_ARCH_X86_64) && !defined(RTE_ARCH_ARM64)
 	RTE_SET_USED(first);
 	RTE_SET_USED(last);
 	RTE_SET_USED(list);
@@ -84,7 +84,7 @@ __rte_stack_lf_pop_elems(struct rte_stack_lf_list *list,
 			 void **obj_table,
 			 struct rte_stack_lf_elem **last)
 {
-#ifndef RTE_ARCH_X86_64
+#if !defined(RTE_ARCH_X86_64) && !defined(RTE_ARCH_ARM64)
 	RTE_SET_USED(obj_table);
 	RTE_SET_USED(last);
 	RTE_SET_USED(list);
-- 
2.7.4