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Subject[RFC PATCH bpf-next 4/4] selftests/bpf: add bpf_trace_btf helper tests
Date
Basic tests verifying various flag combinations for bpf_trace_btf()
using a tp_btf program to trace skb data.

Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
---
tools/testing/selftests/bpf/prog_tests/trace_btf.c | 45 ++++++++++++++++++++++
.../selftests/bpf/progs/netif_receive_skb.c | 43 +++++++++++++++++++++
2 files changed, 88 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/trace_btf.c
create mode 100644 tools/testing/selftests/bpf/progs/netif_receive_skb.c

diff --git a/tools/testing/selftests/bpf/prog_tests/trace_btf.c b/tools/testing/selftests/bpf/prog_tests/trace_btf.c
new file mode 100644
index 0000000..e64b69d
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/trace_btf.c
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <test_progs.h>
+
+#include "netif_receive_skb.skel.h"
+
+void test_trace_btf(void)
+{
+ struct netif_receive_skb *skel;
+ struct netif_receive_skb__bss *bss;
+ int err, duration = 0;
+
+ skel = netif_receive_skb__open();
+ if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
+ return;
+
+ err = netif_receive_skb__load(skel);
+ if (CHECK(err, "skel_load", "failed to load skeleton: %d\n", err))
+ goto cleanup;
+
+ bss = skel->bss;
+
+ err = netif_receive_skb__attach(skel);
+ if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
+ goto cleanup;
+
+ /* generate receive event */
+ system("ping -c 10 127.0.0.1");
+
+ /*
+ * Make sure netif_receive_skb program was triggered
+ * and it set expected return values from bpf_trace_printk()s
+ * and all tests ran.
+ */
+ if (CHECK(bss->ret <= 0,
+ "bpf_trace_btf: got return value",
+ "ret <= 0 %ld test %d\n", bss->ret, bss->num_subtests))
+ goto cleanup;
+
+ CHECK(bss->num_subtests != bss->ran_subtests, "check all subtests ran",
+ "only ran %d of %d tests\n", bss->num_subtests,
+ bss->ran_subtests);
+
+cleanup:
+ netif_receive_skb__destroy(skel);
+}
diff --git a/tools/testing/selftests/bpf/progs/netif_receive_skb.c b/tools/testing/selftests/bpf/progs/netif_receive_skb.c
new file mode 100644
index 0000000..cab764e
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/netif_receive_skb.c
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2020, Oracle and/or its affiliates. */
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+char _license[] SEC("license") = "GPL";
+
+long ret = 0;
+int num_subtests = 0;
+int ran_subtests = 0;
+
+#define CHECK_TRACE(_p, flags) \
+ do { \
+ ++num_subtests; \
+ if (ret >= 0) { \
+ ++ran_subtests; \
+ ret = bpf_trace_btf(_p, sizeof(*(_p)), 0, flags);\
+ } \
+ } while (0)
+
+/* TRACE_EVENT(netif_receive_skb,
+ * TP_PROTO(struct sk_buff *skb),
+ */
+SEC("tp_btf/netif_receive_skb")
+int BPF_PROG(trace_netif_receive_skb, struct sk_buff *skb)
+{
+ static const char skb_type[] = "struct sk_buff";
+ static struct btf_ptr p = { };
+
+ p.ptr = skb;
+ p.type = skb_type;
+
+ CHECK_TRACE(&p, 0);
+ CHECK_TRACE(&p, BTF_TRACE_F_COMPACT);
+ CHECK_TRACE(&p, BTF_TRACE_F_NONAME);
+ CHECK_TRACE(&p, BTF_TRACE_F_PTR_RAW);
+ CHECK_TRACE(&p, BTF_TRACE_F_ZERO);
+ CHECK_TRACE(&p, BTF_TRACE_F_COMPACT | BTF_TRACE_F_NONAME |
+ BTF_TRACE_F_PTR_RAW | BTF_TRACE_F_ZERO);
+
+ return 0;
+}
--
1.8.3.1
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