diff mbox series

[v2,bpf-next,2/2] selftests/bpf: Test bpf_can_loop

Message ID 20240227055235.23463-3-alexei.starovoitov@gmail.com (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series bpf: Introduce bpf_can_loop | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for bpf-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 8 this patch: 8
netdev/build_tools success Errors and warnings before: 1 this patch: 1
netdev/cc_maintainers warning 11 maintainers not CCed: jolsa@kernel.org mykolal@fb.com john.fastabend@gmail.com yonghong.song@linux.dev martin.lau@linux.dev song@kernel.org shuah@kernel.org sdf@google.com linux-kselftest@vger.kernel.org kpsingh@kernel.org haoluo@google.com
netdev/build_clang success Errors and warnings before: 8 this patch: 8
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 8 this patch: 8
netdev/checkpatch warning CHECK: extern prototypes should be avoided in .h files WARNING: Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
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bpf/vmtest-bpf-next-VM_Test-23 fail Logs for x86_64-gcc / test (test_progs_no_alu32, false, 360) / test_progs_no_alu32 on x86_64 with gcc
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Commit Message

Alexei Starovoitov Feb. 27, 2024, 5:52 a.m. UTC 
From: Alexei Starovoitov <ast@kernel.org>

Add a sanity test for bpf_can_loop().

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
---
 tools/lib/bpf/bpf_helpers.h                   |  1 +
 .../bpf/progs/verifier_iterating_callbacks.c  | 47 +++++++++++++++++++
 2 files changed, 48 insertions(+)
diff mbox series

Patch

diff --git a/tools/lib/bpf/bpf_helpers.h b/tools/lib/bpf/bpf_helpers.h
index 79eaa581be98..70270f07074e 100644
--- a/tools/lib/bpf/bpf_helpers.h
+++ b/tools/lib/bpf/bpf_helpers.h
@@ -307,6 +307,7 @@  struct bpf_iter_num;
 extern int bpf_iter_num_new(struct bpf_iter_num *it, int start, int end) __weak __ksym;
 extern int *bpf_iter_num_next(struct bpf_iter_num *it) __weak __ksym;
 extern void bpf_iter_num_destroy(struct bpf_iter_num *it) __weak __ksym;
+extern long bpf_can_loop(void *ignored) __weak __ksym;
 
 #ifndef bpf_for_each
 /* bpf_for_each(iter_type, cur_elem, args...) provides generic construct for
diff --git a/tools/testing/selftests/bpf/progs/verifier_iterating_callbacks.c b/tools/testing/selftests/bpf/progs/verifier_iterating_callbacks.c
index 5905e036e0ea..3fc0e82ffc03 100644
--- a/tools/testing/selftests/bpf/progs/verifier_iterating_callbacks.c
+++ b/tools/testing/selftests/bpf/progs/verifier_iterating_callbacks.c
@@ -239,4 +239,51 @@  int bpf_loop_iter_limit_nested(void *unused)
 	return 1000 * a + b + c;
 }
 
+SEC("socket")
+__success __retval(0xd495cdc0)
+int can_loop1(const void *ctx)
+{
+	volatile int i;
+	int sum = 0;
+
+	for (i = 0; i < 1000000 && bpf_can_loop(0); i++)
+		sum += i;
+	for (i = 0; i < 1000000 && bpf_can_loop(0); i++)
+		sum += i;
+
+	return sum;
+}
+
+SEC("socket")
+__success __retval(999000000)
+int can_loop2(const void *ctx)
+{
+	volatile int i, j;
+	int sum = 0;
+
+	for (i = 0; i < 1000 && bpf_can_loop(0); i++)
+		for (j = 0; j < 1000 && bpf_can_loop(0); j++)
+			sum += i + j;
+
+	return sum;
+}
+
+static __noinline int loop(void)
+{
+	volatile int i;
+	int sum = 0;
+
+	for (i = 0; i <= 1000 && bpf_can_loop(0); i++)
+		sum += i;
+
+	return sum;
+}
+
+SEC("socket")
+__success __retval(500500)
+int can_loop3(const void *ctx)
+{
+	return loop();
+}
+
 char _license[] SEC("license") = "GPL";