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Date: Wed, 10 Mar 2021 09:09:29 +0100
From: Björn Töpel <bjorn.topel@...il.com>
To: ast@...nel.org, daniel@...earbox.net, netdev@...r.kernel.org,
bpf@...r.kernel.org, andrii@...nel.org
Cc: Björn Töpel <bjorn.topel@...el.com>,
magnus.karlsson@...el.com, jonathan.lemon@...il.com,
maximmi@...dia.com, ciara.loftus@...el.com
Subject: [PATCH bpf-next 2/2] libbpf: xsk: move barriers from libbpf_util.h to xsk.h
From: Björn Töpel <bjorn.topel@...el.com>
The only user of libbpf_util.h is xsk.h. Move the barriers to xsk.h,
and remove libbpf_util.h. The barriers are used as an implementation
detail, and should not be considered part of the stable API.
Signed-off-by: Björn Töpel <bjorn.topel@...el.com>
---
tools/lib/bpf/Makefile | 1 -
tools/lib/bpf/libbpf_util.h | 82 -------------------------------------
tools/lib/bpf/xsk.h | 68 +++++++++++++++++++++++++++++-
3 files changed, 67 insertions(+), 84 deletions(-)
delete mode 100644 tools/lib/bpf/libbpf_util.h
diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index 8170f88e8ea6..f45bacbaa3d5 100644
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -228,7 +228,6 @@ install_headers: $(BPF_HELPER_DEFS)
$(call do_install,bpf.h,$(prefix)/include/bpf,644); \
$(call do_install,libbpf.h,$(prefix)/include/bpf,644); \
$(call do_install,btf.h,$(prefix)/include/bpf,644); \
- $(call do_install,libbpf_util.h,$(prefix)/include/bpf,644); \
$(call do_install,libbpf_common.h,$(prefix)/include/bpf,644); \
$(call do_install,xsk.h,$(prefix)/include/bpf,644); \
$(call do_install,bpf_helpers.h,$(prefix)/include/bpf,644); \
diff --git a/tools/lib/bpf/libbpf_util.h b/tools/lib/bpf/libbpf_util.h
deleted file mode 100644
index 954da9b34a34..000000000000
--- a/tools/lib/bpf/libbpf_util.h
+++ /dev/null
@@ -1,82 +0,0 @@
-/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
-/* Copyright (c) 2019 Facebook */
-
-#ifndef __LIBBPF_LIBBPF_UTIL_H
-#define __LIBBPF_LIBBPF_UTIL_H
-
-#include <stdbool.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/* Load-Acquire Store-Release barriers used by the XDP socket
- * library. The following macros should *NOT* be considered part of
- * the xsk.h API, and is subject to change anytime.
- *
- * LIBRARY INTERNAL
- */
-
-#define __XSK_READ_ONCE(x) (*(volatile typeof(x) *)&x)
-#define __XSK_WRITE_ONCE(x, v) (*(volatile typeof(x) *)&x) = (v)
-
-#if defined(__i386__) || defined(__x86_64__)
-# define libbpf_smp_store_release(p, v) \
- do { \
- asm volatile("" : : : "memory"); \
- __XSK_WRITE_ONCE(*p, v); \
- } while (0)
-# define libbpf_smp_load_acquire(p) \
- ({ \
- typeof(*p) ___p1 = __XSK_READ_ONCE(*p); \
- asm volatile("" : : : "memory"); \
- ___p1; \
- })
-#elif defined(__aarch64__)
-# define libbpf_smp_store_release(p, v) \
- asm volatile ("stlr %w1, %0" : "=Q" (*p) : "r" (v) : "memory")
-# define libbpf_smp_load_acquire(p) \
- ({ \
- typeof(*p) ___p1; \
- asm volatile ("ldar %w0, %1" \
- : "=r" (___p1) : "Q" (*p) : "memory"); \
- ___p1; \
- })
-#elif defined(__riscv)
-# define libbpf_smp_store_release(p, v) \
- do { \
- asm volatile ("fence rw,w" : : : "memory"); \
- __XSK_WRITE_ONCE(*p, v); \
- } while (0)
-# define libbpf_smp_load_acquire(p) \
- ({ \
- typeof(*p) ___p1 = __XSK_READ_ONCE(*p); \
- asm volatile ("fence r,rw" : : : "memory"); \
- ___p1; \
- })
-#endif
-
-#ifndef libbpf_smp_store_release
-#define libbpf_smp_store_release(p, v) \
- do { \
- __sync_synchronize(); \
- __XSK_WRITE_ONCE(*p, v); \
- } while (0)
-#endif
-
-#ifndef libbpf_smp_load_acquire
-#define libbpf_smp_load_acquire(p) \
- ({ \
- typeof(*p) ___p1 = __XSK_READ_ONCE(*p); \
- __sync_synchronize(); \
- ___p1; \
- })
-#endif
-
-/* LIBRARY INTERNAL -- END */
-
-#ifdef __cplusplus
-} /* extern "C" */
-#endif
-
-#endif
diff --git a/tools/lib/bpf/xsk.h b/tools/lib/bpf/xsk.h
index a9fdea87b5cd..1d846a419d21 100644
--- a/tools/lib/bpf/xsk.h
+++ b/tools/lib/bpf/xsk.h
@@ -4,6 +4,7 @@
* AF_XDP user-space access library.
*
* Copyright(c) 2018 - 2019 Intel Corporation.
+ * Copyright (c) 2019 Facebook
*
* Author(s): Magnus Karlsson <magnus.karlsson@...el.com>
*/
@@ -13,15 +14,80 @@
#include <stdio.h>
#include <stdint.h>
+#include <stdbool.h>
#include <linux/if_xdp.h>
#include "libbpf.h"
-#include "libbpf_util.h"
#ifdef __cplusplus
extern "C" {
#endif
+/* Load-Acquire Store-Release barriers used by the XDP socket
+ * library. The following macros should *NOT* be considered part of
+ * the xsk.h API, and is subject to change anytime.
+ *
+ * LIBRARY INTERNAL
+ */
+
+#define __XSK_READ_ONCE(x) (*(volatile typeof(x) *)&x)
+#define __XSK_WRITE_ONCE(x, v) (*(volatile typeof(x) *)&x) = (v)
+
+#if defined(__i386__) || defined(__x86_64__)
+# define libbpf_smp_store_release(p, v) \
+ do { \
+ asm volatile("" : : : "memory"); \
+ __XSK_WRITE_ONCE(*p, v); \
+ } while (0)
+# define libbpf_smp_load_acquire(p) \
+ ({ \
+ typeof(*p) ___p1 = __XSK_READ_ONCE(*p); \
+ asm volatile("" : : : "memory"); \
+ ___p1; \
+ })
+#elif defined(__aarch64__)
+# define libbpf_smp_store_release(p, v) \
+ asm volatile ("stlr %w1, %0" : "=Q" (*p) : "r" (v) : "memory")
+# define libbpf_smp_load_acquire(p) \
+ ({ \
+ typeof(*p) ___p1; \
+ asm volatile ("ldar %w0, %1" \
+ : "=r" (___p1) : "Q" (*p) : "memory"); \
+ ___p1; \
+ })
+#elif defined(__riscv)
+# define libbpf_smp_store_release(p, v) \
+ do { \
+ asm volatile ("fence rw,w" : : : "memory"); \
+ __XSK_WRITE_ONCE(*p, v); \
+ } while (0)
+# define libbpf_smp_load_acquire(p) \
+ ({ \
+ typeof(*p) ___p1 = __XSK_READ_ONCE(*p); \
+ asm volatile ("fence r,rw" : : : "memory"); \
+ ___p1; \
+ })
+#endif
+
+#ifndef libbpf_smp_store_release
+#define libbpf_smp_store_release(p, v) \
+ do { \
+ __sync_synchronize(); \
+ __XSK_WRITE_ONCE(*p, v); \
+ } while (0)
+#endif
+
+#ifndef libbpf_smp_load_acquire
+#define libbpf_smp_load_acquire(p) \
+ ({ \
+ typeof(*p) ___p1 = __XSK_READ_ONCE(*p); \
+ __sync_synchronize(); \
+ ___p1; \
+ })
+#endif
+
+/* LIBRARY INTERNAL -- END */
+
/* Do not access these members directly. Use the functions below. */
#define DEFINE_XSK_RING(name) \
struct name { \
--
2.27.0
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