netdev - [PATCH bpf-next 4/6] bpf: make BPF_LOG_* flags available in UAPI header

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Date:   Mon, 29 Apr 2019 10:52:25 +0100
From:   Quentin Monnet <quentin.monnet@...ronome.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        oss-drivers@...ronome.com,
        Quentin Monnet <quentin.monnet@...ronome.com>
Subject: [PATCH bpf-next 4/6] bpf: make BPF_LOG_* flags available in UAPI header

The kernel verifier combines several flags to select what kind of logs
to print to the log buffer provided by users.

In order to make it easier to provide the relevant flags, move the
related #define-s to the UAPI header, so that applications can set for
example: attr->log_level = BPF_LOG_LEVEL1 | BPF_LOG_STATS.

Signed-off-by: Quentin Monnet <quentin.monnet@...ronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
---
 include/linux/bpf_verifier.h | 3 ---
 include/uapi/linux/bpf.h     | 5 +++++
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/include/linux/bpf_verifier.h b/include/linux/bpf_verifier.h
index 1305ccbd8fe6..8160a4bb7ad9 100644
--- a/include/linux/bpf_verifier.h
+++ b/include/linux/bpf_verifier.h
@@ -253,9 +253,6 @@ static inline bool bpf_verifier_log_full(const struct bpf_verifier_log *log)
 	return log->len_used >= log->len_total - 1;
 }
 
-#define BPF_LOG_LEVEL1	1
-#define BPF_LOG_LEVEL2	2
-#define BPF_LOG_STATS	4
 #define BPF_LOG_LEVEL	(BPF_LOG_LEVEL1 | BPF_LOG_LEVEL2)
 #define BPF_LOG_MASK	(BPF_LOG_LEVEL | BPF_LOG_STATS)
 
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 72336bac7573..f8e3e764aff4 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -335,6 +335,11 @@ struct bpf_stack_build_id {
 	};
 };
 
+/* verifier log_level values for loading programs, can be combined */
+#define BPF_LOG_LEVEL1	1
+#define BPF_LOG_LEVEL2	2
+#define BPF_LOG_STATS	4
+
 union bpf_attr {
 	struct { /* anonymous struct used by BPF_MAP_CREATE command */
 		__u32	map_type;	/* one of enum bpf_map_type */
-- 
2.17.1