[PATCH v2 2/8] libbpf: Move opts code into dedicated header

[Charlie Jenkins <charlie@xxxxxxxxxxxx>]

Signed-off-by: Charlie Jenkins <charlie@xxxxxxxxxxxx>
---
 tools/include/tools/opts.h      | 68 +++++++++++++++++++++++++++++++++++++++++
 tools/lib/bpf/bpf.c             |  1 +
 tools/lib/bpf/btf.c             |  1 +
 tools/lib/bpf/btf_dump.c        |  1 +
 tools/lib/bpf/libbpf.c          |  3 +-
 tools/lib/bpf/libbpf_internal.h | 48 -----------------------------
 tools/lib/bpf/linker.c          |  1 +
 tools/lib/bpf/netlink.c         |  1 +
 tools/lib/bpf/ringbuf.c         |  1 +
 9 files changed, 76 insertions(+), 49 deletions(-)

diff --git a/tools/include/tools/opts.h b/tools/include/tools/opts.h
new file mode 100644
index 000000000000..42b4c1a66cad
--- /dev/null
+++ b/tools/include/tools/opts.h
@@ -0,0 +1,68 @@
+/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
+
+/*
+ * Options helpers.
+ *
+ * Originally in tools/lib/bpf/libbpf_internal.h
+ */
+
+#ifndef __TOOLS_OPTS_H
+#define __TOOLS_OPTS_H
+
+#include <stdint.h>
+#include <stdio.h>
+
+#ifndef offsetofend
+#define offsetofend(TYPE, MEMBER) \
+	(offsetof(TYPE, MEMBER)	+ sizeof((((TYPE *)0)->MEMBER)))
+#endif
+
+static inline bool lib_is_mem_zeroed(const char *p, ssize_t len)
+{
+	while (len > 0) {
+		if (*p)
+			return false;
+		p++;
+		len--;
+	}
+	return true;
+}
+
+static inline bool lib_validate_opts(const char *opts,
+					size_t opts_sz, size_t user_sz,
+					const char *type_name)
+{
+	if (user_sz < sizeof(size_t)) {
+		fprintf(stderr, "%s size (%zu) is too small\n", type_name, user_sz);
+		return false;
+	}
+	if (!lib_is_mem_zeroed(opts + opts_sz, (ssize_t)user_sz - opts_sz)) {
+		fprintf(stderr, "%s has non-zero extra bytes\n", type_name);
+		return false;
+	}
+	return true;
+}
+
+#define OPTS_VALID(opts, type)						      \
+	(!(opts) || lib_validate_opts((const char *)opts,		      \
+					 offsetofend(struct type,	      \
+						     type##__last_field),     \
+					 (opts)->sz, #type))
+#define OPTS_HAS(opts, field) \
+	((opts) && opts->sz >= offsetofend(typeof(*(opts)), field))
+#define OPTS_GET(opts, field, fallback_value) \
+	(OPTS_HAS(opts, field) ? (opts)->field : fallback_value)
+#define OPTS_SET(opts, field, value)		\
+	do {					\
+		if (OPTS_HAS(opts, field))	\
+			(opts)->field = value;	\
+	} while (0)
+
+#define OPTS_ZEROED(opts, last_nonzero_field)				      \
+({									      \
+	ssize_t __off = offsetofend(typeof(*(opts)), last_nonzero_field);     \
+	!(opts) || lib_is_mem_zeroed((const void *)opts + __off,	      \
+					(opts)->sz - __off);		      \
+})
+
+#endif /* __TOOLS_OPTS_H */
diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index 2a4c71501a17..089f0e0be3a2 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -32,6 +32,7 @@
 #include <linux/kernel.h>
 #include <limits.h>
 #include <sys/resource.h>
+#include <tools/opts.h>
 #include "bpf.h"
 #include "libbpf.h"
 #include "libbpf_internal.h"
diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 2d0840ef599a..e03974de2f02 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -16,6 +16,7 @@
 #include <linux/err.h>
 #include <linux/btf.h>
 #include <gelf.h>
+#include <tools/opts.h>
 #include "btf.h"
 #include "bpf.h"
 #include "libbpf.h"
diff --git a/tools/lib/bpf/btf_dump.c b/tools/lib/bpf/btf_dump.c
index 5dbca76b953f..877479228954 100644
--- a/tools/lib/bpf/btf_dump.c
+++ b/tools/lib/bpf/btf_dump.c
@@ -17,6 +17,7 @@
 #include <linux/err.h>
 #include <linux/btf.h>
 #include <linux/kernel.h>
+#include <tools/opts.h>
 #include "btf.h"
 #include "hashmap.h"
 #include "libbpf.h"
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 5401f2df463d..97a47a3d4e51 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -43,6 +43,7 @@
 #include <sys/vfs.h>
 #include <sys/utsname.h>
 #include <sys/resource.h>
+#include <tools/opts.h>
 #include <libelf.h>
 #include <gelf.h>
 #include <zlib.h>
@@ -1146,7 +1147,7 @@ static int bpf_map__init_kern_struct_ops(struct bpf_map *map)
 
 		kern_member = find_member_by_name(kern_btf, kern_type, mname);
 		if (!kern_member) {
-			if (!libbpf_is_mem_zeroed(mdata, msize)) {
+			if (!lib_is_mem_zeroed(mdata, msize)) {
 				pr_warn("struct_ops init_kern %s: Cannot find member %s in kernel BTF\n",
 					map->name, mname);
 				return -ENOTSUP;
diff --git a/tools/lib/bpf/libbpf_internal.h b/tools/lib/bpf/libbpf_internal.h
index a0dcfb82e455..033b852ed9a7 100644
--- a/tools/lib/bpf/libbpf_internal.h
+++ b/tools/lib/bpf/libbpf_internal.h
@@ -283,54 +283,6 @@ void *libbpf_add_mem(void **data, size_t *cap_cnt, size_t elem_sz,
 		     size_t cur_cnt, size_t max_cnt, size_t add_cnt);
 int libbpf_ensure_mem(void **data, size_t *cap_cnt, size_t elem_sz, size_t need_cnt);
 
-static inline bool libbpf_is_mem_zeroed(const char *p, ssize_t len)
-{
-	while (len > 0) {
-		if (*p)
-			return false;
-		p++;
-		len--;
-	}
-	return true;
-}
-
-static inline bool libbpf_validate_opts(const char *opts,
-					size_t opts_sz, size_t user_sz,
-					const char *type_name)
-{
-	if (user_sz < sizeof(size_t)) {
-		pr_warn("%s size (%zu) is too small\n", type_name, user_sz);
-		return false;
-	}
-	if (!libbpf_is_mem_zeroed(opts + opts_sz, (ssize_t)user_sz - opts_sz)) {
-		pr_warn("%s has non-zero extra bytes\n", type_name);
-		return false;
-	}
-	return true;
-}
-
-#define OPTS_VALID(opts, type)						      \
-	(!(opts) || libbpf_validate_opts((const char *)opts,		      \
-					 offsetofend(struct type,	      \
-						     type##__last_field),     \
-					 (opts)->sz, #type))
-#define OPTS_HAS(opts, field) \
-	((opts) && opts->sz >= offsetofend(typeof(*(opts)), field))
-#define OPTS_GET(opts, field, fallback_value) \
-	(OPTS_HAS(opts, field) ? (opts)->field : fallback_value)
-#define OPTS_SET(opts, field, value)		\
-	do {					\
-		if (OPTS_HAS(opts, field))	\
-			(opts)->field = value;	\
-	} while (0)
-
-#define OPTS_ZEROED(opts, last_nonzero_field)				      \
-({									      \
-	ssize_t __off = offsetofend(typeof(*(opts)), last_nonzero_field);     \
-	!(opts) || libbpf_is_mem_zeroed((const void *)opts + __off,	      \
-					(opts)->sz - __off);		      \
-})
-
 enum kern_feature_id {
 	/* v4.14: kernel support for program & map names. */
 	FEAT_PROG_NAME,
diff --git a/tools/lib/bpf/linker.c b/tools/lib/bpf/linker.c
index 0d4be829551b..e6fb12ba396c 100644
--- a/tools/lib/bpf/linker.c
+++ b/tools/lib/bpf/linker.c
@@ -16,6 +16,7 @@
 #include <elf.h>
 #include <libelf.h>
 #include <fcntl.h>
+#include <tools/opts.h>
 #include "libbpf.h"
 #include "btf.h"
 #include "libbpf_internal.h"
diff --git a/tools/lib/bpf/netlink.c b/tools/lib/bpf/netlink.c
index 68a2def17175..786a4f6dc3ab 100644
--- a/tools/lib/bpf/netlink.c
+++ b/tools/lib/bpf/netlink.c
@@ -11,6 +11,7 @@
 #include <linux/rtnetlink.h>
 #include <linux/netdev.h>
 #include <sys/socket.h>
+#include <tools/opts.h>
 #include <errno.h>
 #include <time.h>
 
diff --git a/tools/lib/bpf/ringbuf.c b/tools/lib/bpf/ringbuf.c
index bfd8dac4c0cc..547781cde26d 100644
--- a/tools/lib/bpf/ringbuf.c
+++ b/tools/lib/bpf/ringbuf.c
@@ -16,6 +16,7 @@
 #include <asm/barrier.h>
 #include <sys/mman.h>
 #include <sys/epoll.h>
+#include <tools/opts.h>
 #include <time.h>
 
 #include "libbpf.h"

-- 
2.44.0