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Date: Wed, 8 Jul 2020 08:15:24 -0700
From: Ian Rogers <irogers@...gle.com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...hat.com>,
Namhyung Kim <namhyung@...nel.org>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
Andrii Nakryiko <andriin@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...omium.org>,
Adrian Hunter <adrian.hunter@...el.com>,
Leo Yan <leo.yan@...aro.org>,
LKML <linux-kernel@...r.kernel.org>,
Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf parse-events: report bpf errors
On Wed, Jul 8, 2020 at 4:19 AM Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
>
> Em Tue, Jul 07, 2020 at 02:14:49PM -0700, Ian Rogers escreveu:
> > Setting the parse_events_error directly doesn't increment num_errors
> > causing the error message not to be displayed. Use the
> > parse_events__handle_error function that sets num_errors and handle
> > multiple errors.
>
> What was the command line you used to exercise the error and then the
> fix?
You need something to stand in for the BPF event so:
Before:
```
$ /tmp/perf/perf record -e /tmp/perf/util/parse-events.o
Run 'perf list' for a list of valid events
Usage: perf record [<options>] [<command>]
or: perf record [<options>] -- <command> [<options>]
-e, --event <event> event selector. use 'perf list' to list available event
```
After:
```
$ /tmp/perf/perf record -e /tmp/perf/util/parse-events.o
event syntax error: '/tmp/perf/util/parse-events.o'
\___ Failed to load /tmp/perf/util/parse-events.o:
BPF object format invalid
(add -v to see detail)
Run 'perf list' for a list of valid events
Usage: perf record [<options>] [<command>]
or: perf record [<options>] -- <command> [<options>]
-e, --event <event> event selector. use 'perf list' to list
available events
```
Thanks,
Ian
> - Arnaldo
>
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
> > ---
> > tools/perf/util/parse-events.c | 38 ++++++++++++++++++----------------
> > 1 file changed, 20 insertions(+), 18 deletions(-)
> >
> > diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> > index c4906a6a9f1a..e88e4c7a2a9a 100644
> > --- a/tools/perf/util/parse-events.c
> > +++ b/tools/perf/util/parse-events.c
> > @@ -767,8 +767,8 @@ int parse_events_load_bpf_obj(struct parse_events_state *parse_state,
> >
> > return 0;
> > errout:
> > - parse_state->error->help = strdup("(add -v to see detail)");
> > - parse_state->error->str = strdup(errbuf);
> > + parse_events__handle_error(parse_state->error, 0,
> > + strdup(errbuf), strdup("(add -v to see detail)"));
> > return err;
> > }
> >
> > @@ -784,36 +784,38 @@ parse_events_config_bpf(struct parse_events_state *parse_state,
> > return 0;
> >
> > list_for_each_entry(term, head_config, list) {
> > - char errbuf[BUFSIZ];
> > int err;
> >
> > if (term->type_term != PARSE_EVENTS__TERM_TYPE_USER) {
> > - snprintf(errbuf, sizeof(errbuf),
> > - "Invalid config term for BPF object");
> > - errbuf[BUFSIZ - 1] = '\0';
> > -
> > - parse_state->error->idx = term->err_term;
> > - parse_state->error->str = strdup(errbuf);
> > + parse_events__handle_error(parse_state->error, term->err_term,
> > + strdup("Invalid config term for BPF object"),
> > + NULL);
> > return -EINVAL;
> > }
> >
> > err = bpf__config_obj(obj, term, parse_state->evlist, &error_pos);
> > if (err) {
> > + char errbuf[BUFSIZ];
> > + int idx;
> > +
> > bpf__strerror_config_obj(obj, term, parse_state->evlist,
> > &error_pos, err, errbuf,
> > sizeof(errbuf));
> > - parse_state->error->help = strdup(
> > +
> > + if (err == -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE)
> > + idx = term->err_val;
> > + else
> > + idx = term->err_term + error_pos;
> > +
> > + parse_events__handle_error(parse_state->error, idx,
> > + strdup(errbuf),
> > + strdup(
> > "Hint:\tValid config terms:\n"
> > " \tmap:[<arraymap>].value<indices>=[value]\n"
> > " \tmap:[<eventmap>].event<indices>=[event]\n"
> > "\n"
> > " \twhere <indices> is something like [0,3...5] or [all]\n"
> > -" \t(add -v to see detail)");
> > - parse_state->error->str = strdup(errbuf);
> > - if (err == -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE)
> > - parse_state->error->idx = term->err_val;
> > - else
> > - parse_state->error->idx = term->err_term + error_pos;
> > +" \t(add -v to see detail)"));
> > return err;
> > }
> > }
> > @@ -877,8 +879,8 @@ int parse_events_load_bpf(struct parse_events_state *parse_state,
> > -err, errbuf,
> > sizeof(errbuf));
> >
> > - parse_state->error->help = strdup("(add -v to see detail)");
> > - parse_state->error->str = strdup(errbuf);
> > + parse_events__handle_error(parse_state->error, 0,
> > + strdup(errbuf), strdup("(add -v to see detail)"));
> > return err;
> > }
> >
> > --
> > 2.27.0.383.g050319c2ae-goog
> >
>
> --
>
> - Arnaldo
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