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Message-ID: <20210913035609.160722-9-davemarchevsky@fb.com>
Date: Sun, 12 Sep 2021 20:56:08 -0700
From: Dave Marchevsky <davemarchevsky@...com>
To: <bpf@...r.kernel.org>
CC: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Yonghong Song <yhs@...com>, <netdev@...r.kernel.org>,
Dave Marchevsky <davemarchevsky@...com>
Subject: [PATCH v5 bpf-next 8/9] selftests/bpf: add trace_vprintk test prog
This commit adds a test prog for vprintk which confirms that:
* bpf_trace_vprintk is writing to /sys/kernel/debug/tracing/trace_pipe
* __bpf_vprintk macro works as expected
* >3 args are printed
* bpf_printk w/ 0 format args compiles
* bpf_trace_vprintk call w/ a fmt specifier but NULL fmt data fails
Approach and code are borrowed from trace_printk test.
Signed-off-by: Dave Marchevsky <davemarchevsky@...com>
Acked-by: Andrii Nakryiko <andrii@...nel.org>
---
tools/testing/selftests/bpf/Makefile | 3 +-
.../selftests/bpf/prog_tests/trace_vprintk.c | 68 +++++++++++++++++++
.../selftests/bpf/progs/trace_vprintk.c | 33 +++++++++
3 files changed, 103 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/bpf/prog_tests/trace_vprintk.c
create mode 100644 tools/testing/selftests/bpf/progs/trace_vprintk.c
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 1a4d30ff3275..326ea75ce99e 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -315,7 +315,8 @@ LINKED_SKELS := test_static_linked.skel.h linked_funcs.skel.h \
linked_vars.skel.h linked_maps.skel.h
LSKELS := kfunc_call_test.c fentry_test.c fexit_test.c fexit_sleep.c \
- test_ksyms_module.c test_ringbuf.c atomics.c trace_printk.c
+ test_ksyms_module.c test_ringbuf.c atomics.c trace_printk.c \
+ trace_vprintk.c
SKEL_BLACKLIST += $$(LSKELS)
test_static_linked.skel.h-deps := test_static_linked1.o test_static_linked2.o
diff --git a/tools/testing/selftests/bpf/prog_tests/trace_vprintk.c b/tools/testing/selftests/bpf/prog_tests/trace_vprintk.c
new file mode 100644
index 000000000000..61a24e62e1a0
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/trace_vprintk.c
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2021 Facebook */
+
+#include <test_progs.h>
+
+#include "trace_vprintk.lskel.h"
+
+#define TRACEBUF "/sys/kernel/debug/tracing/trace_pipe"
+#define SEARCHMSG "1,2,3,4,5,6,7,8,9,10"
+
+void test_trace_vprintk(void)
+{
+ int err = 0, iter = 0, found = 0;
+ struct trace_vprintk__bss *bss;
+ struct trace_vprintk *skel;
+ char *buf = NULL;
+ FILE *fp = NULL;
+ size_t buflen;
+
+ skel = trace_vprintk__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "trace_vprintk__open_and_load"))
+ goto cleanup;
+
+ bss = skel->bss;
+
+ err = trace_vprintk__attach(skel);
+ if (!ASSERT_OK(err, "trace_vprintk__attach"))
+ goto cleanup;
+
+ fp = fopen(TRACEBUF, "r");
+ if (!ASSERT_OK_PTR(fp, "fopen(TRACEBUF)"))
+ goto cleanup;
+
+ /* We do not want to wait forever if this test fails... */
+ fcntl(fileno(fp), F_SETFL, O_NONBLOCK);
+
+ /* wait for tracepoint to trigger */
+ usleep(1);
+ trace_vprintk__detach(skel);
+
+ if (!ASSERT_GT(bss->trace_vprintk_ran, 0, "bss->trace_vprintk_ran"))
+ goto cleanup;
+
+ if (!ASSERT_GT(bss->trace_vprintk_ret, 0, "bss->trace_vprintk_ret"))
+ goto cleanup;
+
+ /* verify our search string is in the trace buffer */
+ while (getline(&buf, &buflen, fp) >= 0 || errno == EAGAIN) {
+ if (strstr(buf, SEARCHMSG) != NULL)
+ found++;
+ if (found == bss->trace_vprintk_ran)
+ break;
+ if (++iter > 1000)
+ break;
+ }
+
+ if (!ASSERT_EQ(found, bss->trace_vprintk_ran, "found"))
+ goto cleanup;
+
+ if (!ASSERT_LT(bss->null_data_vprintk_ret, 0, "bss->null_data_vprintk_ret"))
+ goto cleanup;
+
+cleanup:
+ trace_vprintk__destroy(skel);
+ free(buf);
+ if (fp)
+ fclose(fp);
+}
diff --git a/tools/testing/selftests/bpf/progs/trace_vprintk.c b/tools/testing/selftests/bpf/progs/trace_vprintk.c
new file mode 100644
index 000000000000..d327241ba047
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/trace_vprintk.c
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2021 Facebook */
+
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+char _license[] SEC("license") = "GPL";
+
+int null_data_vprintk_ret = 0;
+int trace_vprintk_ret = 0;
+int trace_vprintk_ran = 0;
+
+SEC("fentry/__x64_sys_nanosleep")
+int sys_enter(void *ctx)
+{
+ static const char one[] = "1";
+ static const char three[] = "3";
+ static const char five[] = "5";
+ static const char seven[] = "7";
+ static const char nine[] = "9";
+ static const char f[] = "%pS\n";
+
+ /* runner doesn't search for \t, just ensure it compiles */
+ bpf_printk("\t");
+
+ trace_vprintk_ret = __bpf_vprintk("%s,%d,%s,%d,%s,%d,%s,%d,%s,%d %d\n",
+ one, 2, three, 4, five, 6, seven, 8, nine, 10, ++trace_vprintk_ran);
+
+ /* non-NULL fmt w/ NULL data should result in error */
+ null_data_vprintk_ret = bpf_trace_vprintk(f, sizeof(f), NULL, 0);
+ return 0;
+}
--
2.30.2
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