[dpdk-dev] [PATCH 1/8] bpf/arm64: add build infrastructure

[jerinj at marvell.com]

From: Jerin Jacob <jerinj at marvell.com>

Add build infrastructure and documentation
update for arm64 JIT support.

Signed-off-by: Jerin Jacob <jerinj at marvell.com>
---
 MAINTAINERS                            |  1 +
 doc/guides/prog_guide/bpf_lib.rst      |  2 +-
 doc/guides/rel_notes/release_19_11.rst |  5 +++++
 lib/librte_bpf/Makefile                |  2 ++
 lib/librte_bpf/bpf.c                   |  4 +++-
 lib/librte_bpf/bpf_impl.h              |  3 +--
 lib/librte_bpf/bpf_jit_arm64.c         | 19 +++++++++++++++++++
 lib/librte_bpf/meson.build             |  2 ++
 8 files changed, 34 insertions(+), 4 deletions(-)
 create mode 100644 lib/librte_bpf/bpf_jit_arm64.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 410026086..c2e91343c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -252,6 +252,7 @@ M: Gavin Hu <gavin.hu at arm.com>
 F: lib/librte_eal/common/include/arch/arm/*_64.h
 F: lib/librte_net/net_crc_neon.h
 F: lib/librte_acl/acl_run_neon.*
+F: lib/librte_bpf/bpf_jit_arm64.c
 F: lib/librte_lpm/rte_lpm_neon.h
 F: lib/librte_hash/rte*_arm64.h
 F: lib/librte_efd/rte*_arm64.h
diff --git a/doc/guides/prog_guide/bpf_lib.rst b/doc/guides/prog_guide/bpf_lib.rst
index 7c08e6b2d..9c728da7b 100644
--- a/doc/guides/prog_guide/bpf_lib.rst
+++ b/doc/guides/prog_guide/bpf_lib.rst
@@ -30,7 +30,7 @@ The library API provides the following basic operations:
 Not currently supported eBPF features
 -------------------------------------
 
- - JIT for non X86_64 platforms
+ - JIT support only available for X86_64 and arm64 platforms
  - cBPF
  - tail-pointer call
  - eBPF MAP
diff --git a/doc/guides/rel_notes/release_19_11.rst b/doc/guides/rel_notes/release_19_11.rst
index 8490d897c..a0a92b8ae 100644
--- a/doc/guides/rel_notes/release_19_11.rst
+++ b/doc/guides/rel_notes/release_19_11.rst
@@ -56,6 +56,11 @@ New Features
      Also, make sure to start the actual text at the margin.
      =========================================================
 
+* **Added eBPF JIT support for arm64.**
+
+  Added eBPF JIT support for arm64 architecture to improve the eBPF program
+  performance.
+
 
 Removed Items
 -------------
diff --git a/lib/librte_bpf/Makefile b/lib/librte_bpf/Makefile
index c0e8aaa68..419a5162e 100644
--- a/lib/librte_bpf/Makefile
+++ b/lib/librte_bpf/Makefile
@@ -31,6 +31,8 @@ SRCS-$(CONFIG_RTE_LIBRTE_BPF) += bpf_load_elf.c
 endif
 ifeq ($(CONFIG_RTE_ARCH_X86_64),y)
 SRCS-$(CONFIG_RTE_LIBRTE_BPF) += bpf_jit_x86.c
+else ifeq ($(CONFIG_RTE_ARCH_ARM64),y)
+SRCS-$(CONFIG_RTE_LIBRTE_BPF) += bpf_jit_arm64.c
 endif
 
 # install header files
diff --git a/lib/librte_bpf/bpf.c b/lib/librte_bpf/bpf.c
index cc963d52e..7e1879ffa 100644
--- a/lib/librte_bpf/bpf.c
+++ b/lib/librte_bpf/bpf.c
@@ -41,8 +41,10 @@ bpf_jit(struct rte_bpf *bpf)
 {
 	int32_t rc;
 
-#ifdef RTE_ARCH_X86_64
+#if defined(RTE_ARCH_X86_64)
 	rc = bpf_jit_x86(bpf);
+#elif defined(RTE_ARCH_ARM64)
+	rc = bpf_jit_arm64(bpf);
 #else
 	rc = -ENOTSUP;
 #endif
diff --git a/lib/librte_bpf/bpf_impl.h b/lib/librte_bpf/bpf_impl.h
index b577e2cbe..03ba0ae11 100644
--- a/lib/librte_bpf/bpf_impl.h
+++ b/lib/librte_bpf/bpf_impl.h
@@ -25,9 +25,8 @@ extern int bpf_validate(struct rte_bpf *bpf);
 
 extern int bpf_jit(struct rte_bpf *bpf);
 
-#ifdef RTE_ARCH_X86_64
 extern int bpf_jit_x86(struct rte_bpf *);
-#endif
+extern int bpf_jit_arm64(struct rte_bpf *);
 
 extern int rte_bpf_logtype;
 
diff --git a/lib/librte_bpf/bpf_jit_arm64.c b/lib/librte_bpf/bpf_jit_arm64.c
new file mode 100644
index 000000000..621bb7f46
--- /dev/null
+++ b/lib/librte_bpf/bpf_jit_arm64.c
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(C) 2019 Marvell International Ltd.
+ */
+
+#include <errno.h>
+
+#include <rte_common.h>
+
+#include "bpf_impl.h"
+/*
+ * Produce a native ISA version of the given BPF code.
+ */
+int
+bpf_jit_arm64(struct rte_bpf *bpf)
+{
+	RTE_SET_USED(bpf);
+
+	return -ENOTSUP;
+}
diff --git a/lib/librte_bpf/meson.build b/lib/librte_bpf/meson.build
index 11c1fb558..13fc02db3 100644
--- a/lib/librte_bpf/meson.build
+++ b/lib/librte_bpf/meson.build
@@ -10,6 +10,8 @@ sources = files('bpf.c',
 
 if arch_subdir == 'x86' and dpdk_conf.get('RTE_ARCH_64')
 	sources += files('bpf_jit_x86.c')
+elif dpdk_conf.has('RTE_ARCH_ARM64')
+	sources += files('bpf_jit_arm64.c')
 endif
 
 install_headers = files('bpf_def.h',
-- 
2.23.0