[PATCH bpf-next v4 10/14] libbpf: Move data structure manipulation macros to bpf_common_helpers.h

[Ilya Leoshkevich <iii@linux.ibm.com>]

These macros are useful for both libbpf and bpf progs, so put them into
a separate header dedicated to this use case.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 tools/lib/bpf/Makefile                 |  2 +-
 tools/lib/bpf/bpf_common_helpers.h     | 30 ++++++++++++++++++++++++++
 tools/lib/bpf/bpf_helpers.h            | 15 +------------
 tools/testing/selftests/bpf/bpf_util.h | 10 +--------
 4 files changed, 33 insertions(+), 24 deletions(-)
 create mode 100644 tools/lib/bpf/bpf_common_helpers.h

diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index b8b37fe76006..60b06c22e0a1 100644
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -239,7 +239,7 @@ install_lib: all_cmd
 
 SRC_HDRS := bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h xsk.h	     \
 	    bpf_helpers.h bpf_tracing.h bpf_endian.h bpf_core_read.h	     \
-	    skel_internal.h libbpf_version.h
+	    skel_internal.h libbpf_version.h bpf_common_helpers.h
 GEN_HDRS := $(BPF_GENERATED)
 
 INSTALL_PFX := $(DESTDIR)$(prefix)/include/bpf
diff --git a/tools/lib/bpf/bpf_common_helpers.h b/tools/lib/bpf/bpf_common_helpers.h
new file mode 100644
index 000000000000..79db303b6ae2
--- /dev/null
+++ b/tools/lib/bpf/bpf_common_helpers.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
+#ifndef __BPF_COMMON_HELPERS__
+#define __BPF_COMMON_HELPERS__
+
+/*
+ * Helper macros that can be used both by libbpf and bpf progs.
+ */
+
+#ifndef offsetof
+#define offsetof(TYPE, MEMBER) ((unsigned long)&((TYPE *)0)->MEMBER)
+#endif
+
+#ifndef sizeof_field
+#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER))
+#endif
+
+#ifndef offsetofend
+#define offsetofend(TYPE, MEMBER) \
+	(offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER))
+#endif
+
+#ifndef container_of
+#define container_of(ptr, type, member)				\
+	({							\
+		void *__mptr = (void *)(ptr);			\
+		((type *)(__mptr - offsetof(type, member)));	\
+	})
+#endif
+
+#endif
diff --git a/tools/lib/bpf/bpf_helpers.h b/tools/lib/bpf/bpf_helpers.h
index 44df982d2a5c..1e8b609c1000 100644
--- a/tools/lib/bpf/bpf_helpers.h
+++ b/tools/lib/bpf/bpf_helpers.h
@@ -2,6 +2,7 @@
 #ifndef __BPF_HELPERS__
 #define __BPF_HELPERS__
 
+#include "bpf_common_helpers.h"
 /*
  * Note that bpf programs need to include either
  * vmlinux.h (auto-generated from BTF) or linux/types.h
@@ -61,20 +62,6 @@
 #define KERNEL_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + ((c) > 255 ? 255 : (c)))
 #endif
 
-/*
- * Helper macros to manipulate data structures
- */
-#ifndef offsetof
-#define offsetof(TYPE, MEMBER)	((unsigned long)&((TYPE *)0)->MEMBER)
-#endif
-#ifndef container_of
-#define container_of(ptr, type, member)				\
-	({							\
-		void *__mptr = (void *)(ptr);			\
-		((type *)(__mptr - offsetof(type, member)));	\
-	})
-#endif
-
 /*
  * Helper macro to throw a compilation error if __bpf_unreachable() gets
  * built into the resulting code. This works given BPF back end does not
diff --git a/tools/testing/selftests/bpf/bpf_util.h b/tools/testing/selftests/bpf/bpf_util.h
index a3352a64c067..bc0b741b1eef 100644
--- a/tools/testing/selftests/bpf/bpf_util.h
+++ b/tools/testing/selftests/bpf/bpf_util.h
@@ -6,6 +6,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
+#include <bpf/bpf_common_helpers.h>
 #include <bpf/libbpf.h> /* libbpf_num_possible_cpus */
 
 static inline unsigned int bpf_num_possible_cpus(void)
@@ -31,13 +32,4 @@ static inline unsigned int bpf_num_possible_cpus(void)
 # define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 #endif
 
-#ifndef sizeof_field
-#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER))
-#endif
-
-#ifndef offsetofend
-#define offsetofend(TYPE, MEMBER) \
-	(offsetof(TYPE, MEMBER)	+ sizeof_field(TYPE, MEMBER))
-#endif
-
 #endif /* __BPF_UTIL__ */
-- 
2.34.1