From: Alexei Starovoitov <ast@kernel.org>
Date: Wed, 28 Mar 2018 12:05:39 -0700
Subject: samples/bpf: raw tracepoint test
Patch-mainline: v4.17-rc1
Git-commit: 4662a4e53890badf4da17e441606a2885f29d56d
References: bsc#1109837

add empty raw_tracepoint bpf program to test overhead similar
to kprobe and traditional tracepoint tests

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 samples/bpf/Makefile                    |    1 +
 samples/bpf/bpf_load.c                  |   14 ++++++++++++++
 samples/bpf/test_overhead_raw_tp_kern.c |   17 +++++++++++++++++
 samples/bpf/test_overhead_user.c        |   12 ++++++++++++
 4 files changed, 44 insertions(+)
 create mode 100644 samples/bpf/test_overhead_raw_tp_kern.c

--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -121,6 +121,7 @@ always += offwaketime_kern.o
 always += spintest_kern.o
 always += map_perf_test_kern.o
 always += test_overhead_tp_kern.o
+always += test_overhead_raw_tp_kern.o
 always += test_overhead_kprobe_kern.o
 always += parse_varlen.o parse_simple.o parse_ldabs.o
 always += test_cgrp2_tc_kern.o
--- a/samples/bpf/bpf_load.c
+++ b/samples/bpf/bpf_load.c
@@ -60,6 +60,7 @@ static int load_and_attach(const char *e
 	bool is_kprobe = strncmp(event, "kprobe/", 7) == 0;
 	bool is_kretprobe = strncmp(event, "kretprobe/", 10) == 0;
 	bool is_tracepoint = strncmp(event, "tracepoint/", 11) == 0;
+	bool is_raw_tracepoint = strncmp(event, "raw_tracepoint/", 15) == 0;
 	bool is_xdp = strncmp(event, "xdp", 3) == 0;
 	bool is_perf_event = strncmp(event, "perf_event", 10) == 0;
 	bool is_cgroup_skb = strncmp(event, "cgroup/skb", 10) == 0;
@@ -84,6 +85,8 @@ static int load_and_attach(const char *e
 		prog_type = BPF_PROG_TYPE_KPROBE;
 	} else if (is_tracepoint) {
 		prog_type = BPF_PROG_TYPE_TRACEPOINT;
+	} else if (is_raw_tracepoint) {
+		prog_type = BPF_PROG_TYPE_RAW_TRACEPOINT;
 	} else if (is_xdp) {
 		prog_type = BPF_PROG_TYPE_XDP;
 	} else if (is_perf_event) {
@@ -130,6 +133,16 @@ static int load_and_attach(const char *e
 		return populate_prog_array(event, fd);
 	}
 
+	if (is_raw_tracepoint) {
+		efd = bpf_raw_tracepoint_open(event + 15, fd);
+		if (efd < 0) {
+			printf("tracepoint %s %s\n", event + 15, strerror(errno));
+			return -1;
+		}
+		event_fd[prog_cnt - 1] = efd;
+		return 0;
+	}
+
 	if (is_kprobe || is_kretprobe) {
 		if (is_kprobe)
 			event += 7;
@@ -586,6 +599,7 @@ static int do_load_bpf_file(const char *
 		if (memcmp(shname, "kprobe/", 7) == 0 ||
 		    memcmp(shname, "kretprobe/", 10) == 0 ||
 		    memcmp(shname, "tracepoint/", 11) == 0 ||
+		    memcmp(shname, "raw_tracepoint/", 15) == 0 ||
 		    memcmp(shname, "xdp", 3) == 0 ||
 		    memcmp(shname, "perf_event", 10) == 0 ||
 		    memcmp(shname, "socket", 6) == 0 ||
--- /dev/null
+++ b/samples/bpf/test_overhead_raw_tp_kern.c
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2018 Facebook */
+#include <uapi/linux/bpf.h>
+#include "bpf_helpers.h"
+
+SEC("raw_tracepoint/task_rename")
+int prog(struct bpf_raw_tracepoint_args *ctx)
+{
+	return 0;
+}
+
+SEC("raw_tracepoint/urandom_read")
+int prog2(struct bpf_raw_tracepoint_args *ctx)
+{
+	return 0;
+}
+char _license[] SEC("license") = "GPL";
--- a/samples/bpf/test_overhead_user.c
+++ b/samples/bpf/test_overhead_user.c
@@ -158,5 +158,17 @@ int main(int argc, char **argv)
 		unload_progs();
 	}
 
+	if (test_flags & 0xC0) {
+		snprintf(filename, sizeof(filename),
+			 "%s_raw_tp_kern.o", argv[0]);
+		if (load_bpf_file(filename)) {
+			printf("%s", bpf_log_buf);
+			return 1;
+		}
+		printf("w/RAW_TRACEPOINT\n");
+		run_perf_test(num_cpu, test_flags >> 6);
+		unload_progs();
+	}
+
 	return 0;
 }