veristat: Document verifier log dumping capability

`-vl2` is a useful combination of flags to dump the entire
verification log. This is helpful when making changes to the verifier,
as you can see what it thinks program one instruction at a time.

This was more or less a hidden feature before. Document it so others can
discover it.

Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/d57bbcca81e06ae8dcdadaedb99a48dced67e422.1736466129.git.dxu@dxuuu.xyz

diff --git a/tools/testing/selftests/bpf/veristat.c b/tools/testing/selftests/bpf/veristat.c
index 974c808f932112f0cce6558de3f5c4248b52cc10..8dcf5ee000ca8be626e1a40b314935e64bdddb93 100644 (file)
--- a/tools/testing/selftests/bpf/veristat.c
+++ b/tools/testing/selftests/bpf/veristat.c
@@ -216,7 +216,8 @@ const char argp_program_doc[] =
 "\n"
 "USAGE: veristat <obj-file> [<obj-file>...]\n"
 "   OR: veristat -C <baseline.csv> <comparison.csv>\n"
-"   OR: veristat -R <results.csv>\n";
+"   OR: veristat -R <results.csv>\n"
+"   OR: veristat -vl2 <to_analyze.bpf.o>\n";
 
 enum {
        OPT_LOG_FIXED = 1000,
@@ -228,7 +229,7 @@ static const struct argp_option opts[] = {
        { "version", 'V', NULL, 0, "Print version" },
        { "verbose", 'v', NULL, 0, "Verbose mode" },
        { "debug", 'd', NULL, 0, "Debug mode (turns on libbpf debug logging)" },
-       { "log-level", 'l', "LEVEL", 0, "Verifier log level (default 0 for normal mode, 1 for verbose mode)" },
+       { "log-level", 'l', "LEVEL", 0, "Verifier log level (default 0 for normal mode, 1 for verbose mode, 2 for full verification log)" },
        { "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)" },
        { "top-n", 'n', "N", 0, "Emit only up to first N results." },