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Message-ID: <ZTCD2v7RuQojbkn-@u94a>
Date: Thu, 19 Oct 2023 09:18:18 +0800
From: Shung-Hsi Yu <shung-hsi.yu@...e.com>
To: David Ahern <dsahern@...nel.org>
Cc: netdev@...r.kernel.org, Stephen Hemminger <stephen@...workplumber.org>,
Toke Høiland-Jørgensen <toke@...hat.com>
Subject: Re: [PATCH iproute2-next 2/2] bpf: increase verifier verbosity when
in verbose mode
On Wed, Oct 18, 2023 at 08:35:30AM -0600, David Ahern wrote:
> On 10/18/23 12:22 AM, Shung-Hsi Yu wrote:
> > diff --git a/lib/bpf_libbpf.c b/lib/bpf_libbpf.c
> > index f678a710..08692d30 100644
> > --- a/lib/bpf_libbpf.c
> > +++ b/lib/bpf_libbpf.c
> > @@ -285,11 +285,14 @@ static int load_bpf_object(struct bpf_cfg_in *cfg)
> > DECLARE_LIBBPF_OPTS(bpf_object_open_opts, open_opts,
> > .relaxed_maps = true,
> > .pin_root_path = root_path,
> > -#ifdef (LIBBPF_MAJOR_VERSION > 0) || (LIBBPF_MINOR_VERSION >= 7)
> > - .kernel_log_level = 1,
> > -#endif
> > );
> >
> > +#if (LIBBPF_MAJOR_VERSION > 0) || (LIBBPF_MINOR_VERSION >= 7)
> > + open_opts.kernel_log_level = 1;
> > + if (cfg->verbose)
> > + open_opts.kernel_log_level |= 2;
> > +#endif
> > +
> > obj = bpf_object__open_file(cfg->object, &open_opts);
> > if (libbpf_get_error(obj)) {
> > fprintf(stderr, "ERROR: opening BPF object file failed\n");
>
> Why have the first patch if you redo the code here?
Ah, good point. I was trying to separate out libbpf-related changes from
verbosity-increasing changes, hence the first patch. And there I add the
.kernel_log_level field within DECLARE_LIBBPF_OPTS() because that seems to
be how it's usually done.
In the second patch I tried to make log-level changes consistent, having
them all done with `|= 2`, which isn't possible within
DECLARE_LIBBPF_OPTS().
Maybe I should have just have `open_opts.kernel_log_level = 1;` outside of
DECLARE_LIBBPF_OPTS() in the first patch to begin with.
+#if (LIBBPF_MAJOR_VERSION > 0) || (LIBBPF_MINOR_VERSION >= 7)
+ open_opts.kernel_log_level = 1;
+#endif
Followed by
#if (LIBBPF_MAJOR_VERSION > 0) || (LIBBPF_MINOR_VERSION >= 7)
open_opts.kernel_log_level = 1;
+ if (cfg->verbose)
+ open_opts.kernel_log_level |= 2;
#endif
Would be better than
DECLARE_LIBBPF_OPTS(bpf_object_open_opts, open_opts,
.relaxed_maps = true,
.pin_root_path = root_path,
+#ifdef (LIBBPF_MAJOR_VERSION > 0) || (LIBBPF_MINOR_VERSION >= 7)
+ .kernel_log_level = 1,
+#endif
);
Followed by
DECLARE_LIBBPF_OPTS(bpf_object_open_opts, open_opts,
.relaxed_maps = true,
.pin_root_path = root_path,
#ifdef (LIBBPF_MAJOR_VERSION > 0) || (LIBBPF_MINOR_VERSION >= 7)
- .kernel_log_level = 1,
+ .kernel_log_level = cfg->verbose ? (2 | 1) : 1,
#endif
);
I suppose. What do you think?
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