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selftests/bpf: Test skipping stacktrace

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Add a test case for stacktrace with skip > 0 using a small sized
buffer.  It didn't support skipping entries greater than or equal to
the size of buffer and filled the skipped part with 0.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20220314182042.71025-2-namhyung@kernel.org
This commit is contained in:
Namhyung Kim
2022-03-14 11:20:42 -07:00
committed by Alexei Starovoitov
parent ee2a098851
commit e1cc1f3998
2 changed files with 131 additions and 0 deletions
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63
tools/testing/selftests/bpf/prog_tests/stacktrace_map_skip.c Normal file
View File

@@ -0,0 +1,63 @@
// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include "stacktrace_map_skip.skel.h"
#define TEST_STACK_DEPTH 2
void test_stacktrace_map_skip(void)
{
struct stacktrace_map_skip *skel;
int stackid_hmap_fd, stackmap_fd, stack_amap_fd;
int err, stack_trace_len;
skel = stacktrace_map_skip__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel_open_and_load"))
return;
/* find map fds */
stackid_hmap_fd = bpf_map__fd(skel->maps.stackid_hmap);
if (!ASSERT_GE(stackid_hmap_fd, 0, "stackid_hmap fd"))
goto out;
stackmap_fd = bpf_map__fd(skel->maps.stackmap);
if (!ASSERT_GE(stackmap_fd, 0, "stackmap fd"))
goto out;
stack_amap_fd = bpf_map__fd(skel->maps.stack_amap);
if (!ASSERT_GE(stack_amap_fd, 0, "stack_amap fd"))
goto out;
skel->bss->pid = getpid();
err = stacktrace_map_skip__attach(skel);
if (!ASSERT_OK(err, "skel_attach"))
goto out;
/* give some time for bpf program run */
sleep(1);
/* disable stack trace collection */
skel->bss->control = 1;
/* for every element in stackid_hmap, we can find a corresponding one
* in stackmap, and vise versa.
*/
err = compare_map_keys(stackid_hmap_fd, stackmap_fd);
if (!ASSERT_OK(err, "compare_map_keys stackid_hmap vs. stackmap"))
goto out;
err = compare_map_keys(stackmap_fd, stackid_hmap_fd);
if (!ASSERT_OK(err, "compare_map_keys stackmap vs. stackid_hmap"))
goto out;
stack_trace_len = TEST_STACK_DEPTH * sizeof(__u64);
err = compare_stack_ips(stackmap_fd, stack_amap_fd, stack_trace_len);
if (!ASSERT_OK(err, "compare_stack_ips stackmap vs. stack_amap"))
goto out;
if (!ASSERT_EQ(skel->bss->failed, 0, "skip_failed"))
goto out;
out:
stacktrace_map_skip__destroy(skel);
}