netdev - [PATCH bpf-next 2/4] bpf: expose program stats via bpf_prog

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Date:   Fri, 22 Feb 2019 15:36:42 -0800
From:   Alexei Starovoitov <ast@...nel.org>
To:     <davem@...emloft.net>
CC:     <daniel@...earbox.net>, <netdev@...r.kernel.org>,
        <bpf@...r.kernel.org>, <kernel-team@...com>
Subject: [PATCH bpf-next 2/4] bpf: expose program stats via bpf_prog_info

Return bpf program runtime and runcnt via bpf_prog_info

Signed-off-by: Alexei Starovoitov <ast@...nel.org>
---
 include/uapi/linux/bpf.h | 2 ++
 kernel/bpf/syscall.c     | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index bcdd2474eee7..d2cb85d85b39 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -2813,6 +2813,8 @@ struct bpf_prog_info {
 	__u32 jited_line_info_rec_size;
 	__u32 nr_prog_tags;
 	__aligned_u64 prog_tags;
+	__u64 runtime;
+	__u64 runcnt;
 } __attribute__((aligned(8)));
 
 struct bpf_map_info {
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 079e7fa14f39..6c55aeb2e1b7 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -2142,6 +2142,7 @@ static int bpf_prog_get_info_by_fd(struct bpf_prog *prog,
 	struct bpf_prog_info __user *uinfo = u64_to_user_ptr(attr->info.info);
 	struct bpf_prog_info info = {};
 	u32 info_len = attr->info.info_len;
+	struct bpf_prog_stats stats;
 	char __user *uinsns;
 	u32 ulen;
 	int err;
@@ -2181,6 +2182,10 @@ static int bpf_prog_get_info_by_fd(struct bpf_prog *prog,
 	if (err)
 		return err;
 
+	bpf_prog_get_stats(prog, &stats);
+	info.runtime = stats.nsecs;
+	info.runcnt = stats.cnt;
+
 	if (!capable(CAP_SYS_ADMIN)) {
 		info.jited_prog_len = 0;
 		info.xlated_prog_len = 0;
-- 
2.20.0