netdev - [PATCH bpf-next 1/4] libbpf: Define DEFAULT

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Date:   Sat, 23 Apr 2022 14:00:55 +0000
From:   Yafang Shao <laoar.shao@...il.com>
To:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        Yafang Shao <laoar.shao@...il.com>
Subject: [PATCH bpf-next 1/4] libbpf: Define DEFAULT_BPFFS

Let's use a macro DEFAULT_BPFFS instead of the hard-coded "/sys/fs/bpf".

Signed-off-by: Yafang Shao <laoar.shao@...il.com>
---
 tools/lib/bpf/bpf_helpers.h | 2 +-
 tools/lib/bpf/libbpf.c      | 2 +-
 tools/lib/bpf/libbpf.h      | 6 ++++--
 3 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/tools/lib/bpf/bpf_helpers.h b/tools/lib/bpf/bpf_helpers.h
index 44df982d2a5c..9161ebcd3466 100644
--- a/tools/lib/bpf/bpf_helpers.h
+++ b/tools/lib/bpf/bpf_helpers.h
@@ -137,7 +137,7 @@ struct bpf_map_def {
 
 enum libbpf_pin_type {
 	LIBBPF_PIN_NONE,
-	/* PIN_BY_NAME: pin maps by name (in /sys/fs/bpf by default) */
+	/* PIN_BY_NAME: pin maps by name (in DEFAULT_BPFFS by default) */
 	LIBBPF_PIN_BY_NAME,
 };
 
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 9a213aaaac8a..13fcf91e9e0e 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -2180,7 +2180,7 @@ static int build_map_pin_path(struct bpf_map *map, const char *path)
 	int len;
 
 	if (!path)
-		path = "/sys/fs/bpf";
+		path = DEFAULT_BPFFS;
 
 	len = snprintf(buf, PATH_MAX, "%s/%s", path, bpf_map__name(map));
 	if (len < 0)
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index cdbfee60ea3e..3784867811a4 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -28,6 +28,8 @@ LIBBPF_API __u32 libbpf_major_version(void);
 LIBBPF_API __u32 libbpf_minor_version(void);
 LIBBPF_API const char *libbpf_version_string(void);
 
+#define DEFAULT_BPFFS "/sys/fs/bpf"
+
 enum libbpf_errno {
 	__LIBBPF_ERRNO__START = 4000,
 
@@ -91,7 +93,7 @@ struct bpf_object_open_opts {
 	bool relaxed_core_relocs;
 	/* maps that set the 'pinning' attribute in their definition will have
 	 * their pin_path attribute set to a file in this directory, and be
-	 * auto-pinned to that path on load; defaults to "/sys/fs/bpf".
+	 * auto-pinned to that path on load; defaults to DEFAULT_BPFFS.
 	 */
 	const char *pin_root_path;
 
@@ -190,7 +192,7 @@ bpf_object__open_xattr(struct bpf_object_open_attr *attr);
 
 enum libbpf_pin_type {
 	LIBBPF_PIN_NONE,
-	/* PIN_BY_NAME: pin maps by name (in /sys/fs/bpf by default) */
+	/* PIN_BY_NAME: pin maps by name (in DEFAULT_BPFFS by default) */
 	LIBBPF_PIN_BY_NAME,
 };
 
-- 
2.17.1