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Subject[PATCH bpf-next v3 6/7] bpf: Add test ops for BPF_PROG_TYPE_TRACING
Date
From: KP Singh <kpsingh@google.com>

The current fexit and fentry tests rely on a different program to
exercise the functions they attach to. Instead of doing this, implement
the test operations for tracing which will also be used for
BPF_MODIFY_RETURN in a subsequent patch.

Also, clean up the fexit test to use the generated skeleton.

Signed-off-by: KP Singh <kpsingh@google.com>
Acked-by: Andrii Nakryiko <andriin@fb.com>
---
include/linux/bpf.h | 10 +++
kernel/trace/bpf_trace.c | 1 +
net/bpf/test_run.c | 37 +++++++---
.../selftests/bpf/prog_tests/fentry_fexit.c | 12 +---
.../selftests/bpf/prog_tests/fentry_test.c | 14 ++--
.../selftests/bpf/prog_tests/fexit_test.c | 69 ++++++-------------
6 files changed, 67 insertions(+), 76 deletions(-)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index f748b31e5888..40c53924571d 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -1156,6 +1156,9 @@ int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
union bpf_attr __user *uattr);
int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
union bpf_attr __user *uattr);
+int bpf_prog_test_run_tracing(struct bpf_prog *prog,
+ const union bpf_attr *kattr,
+ union bpf_attr __user *uattr);
int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
const union bpf_attr *kattr,
union bpf_attr __user *uattr);
@@ -1313,6 +1316,13 @@ static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
return -ENOTSUPP;
}

+static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
+ const union bpf_attr *kattr,
+ union bpf_attr __user *uattr)
+{
+ return -ENOTSUPP;
+}
+
static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
const union bpf_attr *kattr,
union bpf_attr __user *uattr)
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 07764c761073..363e0a2c75cf 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -1266,6 +1266,7 @@ const struct bpf_verifier_ops tracing_verifier_ops = {
};

const struct bpf_prog_ops tracing_prog_ops = {
+ .test_run = bpf_prog_test_run_tracing,
};

static bool raw_tp_writable_prog_is_valid_access(int off, int size,
diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index 1cd7a1c2f8b2..3600f098e7c6 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -160,18 +160,37 @@ static void *bpf_test_init(const union bpf_attr *kattr, u32 size,
kfree(data);
return ERR_PTR(-EFAULT);
}
- if (bpf_fentry_test1(1) != 2 ||
- bpf_fentry_test2(2, 3) != 5 ||
- bpf_fentry_test3(4, 5, 6) != 15 ||
- bpf_fentry_test4((void *)7, 8, 9, 10) != 34 ||
- bpf_fentry_test5(11, (void *)12, 13, 14, 15) != 65 ||
- bpf_fentry_test6(16, (void *)17, 18, 19, (void *)20, 21) != 111) {
- kfree(data);
- return ERR_PTR(-EFAULT);
- }
+
return data;
}

+int bpf_prog_test_run_tracing(struct bpf_prog *prog,
+ const union bpf_attr *kattr,
+ union bpf_attr __user *uattr)
+{
+ int err = -EFAULT;
+
+ switch (prog->expected_attach_type) {
+ case BPF_TRACE_FENTRY:
+ case BPF_TRACE_FEXIT:
+ if (bpf_fentry_test1(1) != 2 ||
+ bpf_fentry_test2(2, 3) != 5 ||
+ bpf_fentry_test3(4, 5, 6) != 15 ||
+ bpf_fentry_test4((void *)7, 8, 9, 10) != 34 ||
+ bpf_fentry_test5(11, (void *)12, 13, 14, 15) != 65 ||
+ bpf_fentry_test6(16, (void *)17, 18, 19, (void *)20, 21) != 111)
+ goto out;
+ break;
+ default:
+ goto out;
+ }
+
+ err = 0;
+out:
+ trace_bpf_test_finish(&err);
+ return err;
+}
+
static void *bpf_ctx_init(const union bpf_attr *kattr, u32 max_size)
{
void __user *data_in = u64_to_user_ptr(kattr->test.ctx_in);
diff --git a/tools/testing/selftests/bpf/prog_tests/fentry_fexit.c b/tools/testing/selftests/bpf/prog_tests/fentry_fexit.c
index 235ac4f67f5b..83493bd5745c 100644
--- a/tools/testing/selftests/bpf/prog_tests/fentry_fexit.c
+++ b/tools/testing/selftests/bpf/prog_tests/fentry_fexit.c
@@ -1,22 +1,17 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019 Facebook */
#include <test_progs.h>
-#include "test_pkt_access.skel.h"
#include "fentry_test.skel.h"
#include "fexit_test.skel.h"

void test_fentry_fexit(void)
{
- struct test_pkt_access *pkt_skel = NULL;
struct fentry_test *fentry_skel = NULL;
struct fexit_test *fexit_skel = NULL;
__u64 *fentry_res, *fexit_res;
__u32 duration = 0, retval;
- int err, pkt_fd, i;
+ int err, prog_fd, i;

- pkt_skel = test_pkt_access__open_and_load();
- if (CHECK(!pkt_skel, "pkt_skel_load", "pkt_access skeleton failed\n"))
- return;
fentry_skel = fentry_test__open_and_load();
if (CHECK(!fentry_skel, "fentry_skel_load", "fentry skeleton failed\n"))
goto close_prog;
@@ -31,8 +26,8 @@ void test_fentry_fexit(void)
if (CHECK(err, "fexit_attach", "fexit attach failed: %d\n", err))
goto close_prog;

- pkt_fd = bpf_program__fd(pkt_skel->progs.test_pkt_access);
- err = bpf_prog_test_run(pkt_fd, 1, &pkt_v6, sizeof(pkt_v6),
+ prog_fd = bpf_program__fd(fexit_skel->progs.test1);
+ err = bpf_prog_test_run(prog_fd, 1, NULL, 0,
NULL, NULL, &retval, &duration);
CHECK(err || retval, "ipv6",
"err %d errno %d retval %d duration %d\n",
@@ -49,7 +44,6 @@ void test_fentry_fexit(void)
}

close_prog:
- test_pkt_access__destroy(pkt_skel);
fentry_test__destroy(fentry_skel);
fexit_test__destroy(fexit_skel);
}
diff --git a/tools/testing/selftests/bpf/prog_tests/fentry_test.c b/tools/testing/selftests/bpf/prog_tests/fentry_test.c
index 5cc06021f27d..04ebbf1cb390 100644
--- a/tools/testing/selftests/bpf/prog_tests/fentry_test.c
+++ b/tools/testing/selftests/bpf/prog_tests/fentry_test.c
@@ -1,20 +1,15 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019 Facebook */
#include <test_progs.h>
-#include "test_pkt_access.skel.h"
#include "fentry_test.skel.h"

void test_fentry_test(void)
{
- struct test_pkt_access *pkt_skel = NULL;
struct fentry_test *fentry_skel = NULL;
- int err, pkt_fd, i;
+ int err, prog_fd, i;
__u32 duration = 0, retval;
__u64 *result;

- pkt_skel = test_pkt_access__open_and_load();
- if (CHECK(!pkt_skel, "pkt_skel_load", "pkt_access skeleton failed\n"))
- return;
fentry_skel = fentry_test__open_and_load();
if (CHECK(!fentry_skel, "fentry_skel_load", "fentry skeleton failed\n"))
goto cleanup;
@@ -23,10 +18,10 @@ void test_fentry_test(void)
if (CHECK(err, "fentry_attach", "fentry attach failed: %d\n", err))
goto cleanup;

- pkt_fd = bpf_program__fd(pkt_skel->progs.test_pkt_access);
- err = bpf_prog_test_run(pkt_fd, 1, &pkt_v6, sizeof(pkt_v6),
+ prog_fd = bpf_program__fd(fentry_skel->progs.test1);
+ err = bpf_prog_test_run(prog_fd, 1, NULL, 0,
NULL, NULL, &retval, &duration);
- CHECK(err || retval, "ipv6",
+ CHECK(err || retval, "test_run",
"err %d errno %d retval %d duration %d\n",
err, errno, retval, duration);

@@ -39,5 +34,4 @@ void test_fentry_test(void)

cleanup:
fentry_test__destroy(fentry_skel);
- test_pkt_access__destroy(pkt_skel);
}
diff --git a/tools/testing/selftests/bpf/prog_tests/fexit_test.c b/tools/testing/selftests/bpf/prog_tests/fexit_test.c
index d2c3655dd7a3..78d7a2765c27 100644
--- a/tools/testing/selftests/bpf/prog_tests/fexit_test.c
+++ b/tools/testing/selftests/bpf/prog_tests/fexit_test.c
@@ -1,64 +1,37 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019 Facebook */
#include <test_progs.h>
+#include "fexit_test.skel.h"

void test_fexit_test(void)
{
- struct bpf_prog_load_attr attr = {
- .file = "./fexit_test.o",
- };
-
- char prog_name[] = "fexit/bpf_fentry_testX";
- struct bpf_object *obj = NULL, *pkt_obj;
- int err, pkt_fd, kfree_skb_fd, i;
- struct bpf_link *link[6] = {};
- struct bpf_program *prog[6];
+ struct fexit_test *fexit_skel = NULL;
+ int err, prog_fd, i;
__u32 duration = 0, retval;
- struct bpf_map *data_map;
- const int zero = 0;
- u64 result[6];
+ __u64 *result;

- err = bpf_prog_load("./test_pkt_access.o", BPF_PROG_TYPE_SCHED_CLS,
- &pkt_obj, &pkt_fd);
- if (CHECK(err, "prog_load sched cls", "err %d errno %d\n", err, errno))
- return;
- err = bpf_prog_load_xattr(&attr, &obj, &kfree_skb_fd);
- if (CHECK(err, "prog_load fail", "err %d errno %d\n", err, errno))
- goto close_prog;
+ fexit_skel = fexit_test__open_and_load();
+ if (CHECK(!fexit_skel, "fexit_skel_load", "fexit skeleton failed\n"))
+ goto cleanup;

- for (i = 0; i < 6; i++) {
- prog_name[sizeof(prog_name) - 2] = '1' + i;
- prog[i] = bpf_object__find_program_by_title(obj, prog_name);
- if (CHECK(!prog[i], "find_prog", "prog %s not found\n", prog_name))
- goto close_prog;
- link[i] = bpf_program__attach_trace(prog[i]);
- if (CHECK(IS_ERR(link[i]), "attach_trace", "failed to link\n"))
- goto close_prog;
- }
- data_map = bpf_object__find_map_by_name(obj, "fexit_te.bss");
- if (CHECK(!data_map, "find_data_map", "data map not found\n"))
- goto close_prog;
+ err = fexit_test__attach(fexit_skel);
+ if (CHECK(err, "fexit_attach", "fexit attach failed: %d\n", err))
+ goto cleanup;

- err = bpf_prog_test_run(pkt_fd, 1, &pkt_v6, sizeof(pkt_v6),
+ prog_fd = bpf_program__fd(fexit_skel->progs.test1);
+ err = bpf_prog_test_run(prog_fd, 1, NULL, 0,
NULL, NULL, &retval, &duration);
- CHECK(err || retval, "ipv6",
+ CHECK(err || retval, "test_run",
"err %d errno %d retval %d duration %d\n",
err, errno, retval, duration);

- err = bpf_map_lookup_elem(bpf_map__fd(data_map), &zero, &result);
- if (CHECK(err, "get_result",
- "failed to get output data: %d\n", err))
- goto close_prog;
-
- for (i = 0; i < 6; i++)
- if (CHECK(result[i] != 1, "result", "bpf_fentry_test%d failed err %ld\n",
- i + 1, result[i]))
- goto close_prog;
+ result = (__u64 *)fexit_skel->bss;
+ for (i = 0; i < 6; i++) {
+ if (CHECK(result[i] != 1, "result",
+ "fexit_test%d failed err %lld\n", i + 1, result[i]))
+ goto cleanup;
+ }

-close_prog:
- for (i = 0; i < 6; i++)
- if (!IS_ERR_OR_NULL(link[i]))
- bpf_link__destroy(link[i]);
- bpf_object__close(obj);
- bpf_object__close(pkt_obj);
+cleanup:
+ fexit_test__destroy(fexit_skel);
}
--
2.20.1
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