Sometimes during debugging it's important that BPF program is loaded
with BPF_F_TEST_STATE_FREQ flag set to force verifier to do frequent
state checkpointing. Teach veristat to do this when -t ("test state")
flag is specified.
Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
---
tools/testing/selftests/bpf/veristat.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/tools/testing/selftests/bpf/veristat.c b/tools/testing/selftests/bpf/veristat.c
index 1db7185181da..655095810d4a 100644
--- a/tools/testing/selftests/bpf/veristat.c
+++ b/tools/testing/selftests/bpf/veristat.c
@@ -141,6 +141,7 @@ static struct env {
bool verbose;
bool debug;
bool quiet;
+ bool force_checkpoints;
enum resfmt out_fmt;
bool show_version;
bool comparison_mode;
@@ -209,6 +210,8 @@ static const struct argp_option opts[] = {
{ "log-level", 'l', "LEVEL", 0, "Verifier log level (default 0 for normal mode, 1 for verbose mode)" },
{ "log-fixed", OPT_LOG_FIXED, NULL, 0, "Disable verifier log rotation" },
{ "log-size", OPT_LOG_SIZE, "BYTES", 0, "Customize verifier log size (default to 16MB)" },
+ { "test-states", 't', NULL, 0,
+ "Force frequent BPF verifier state checkpointing (set BPF_F_TEST_STATE_FREQ program flag)" },
{ "quiet", 'q', NULL, 0, "Quiet mode" },
{ "emit", 'e', "SPEC", 0, "Specify stats to be emitted" },
{ "sort", 's', "SPEC", 0, "Specify sort order" },
@@ -284,6 +287,9 @@ static error_t parse_arg(int key, char *arg, struct argp_state *state)
argp_usage(state);
}
break;
+ case 't':
+ env.force_checkpoints = true;
+ break;
case 'C':
env.comparison_mode = true;
break;
@@ -989,6 +995,9 @@ static int process_prog(const char *filename, struct bpf_object *obj, struct bpf
/* increase chances of successful BPF object loading */
fixup_obj(obj, prog, base_filename);
+ if (env.force_checkpoints)
+ bpf_program__set_flags(prog, bpf_program__flags(prog) | BPF_F_TEST_STATE_FREQ);
+
err = bpf_object__load(obj);
env.progs_processed++;
--
2.34.1
