netdev - Re: [PATCH 07/10] libbpf: Add bpf_link_create support for multi kprobes

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Date:   Sun, 6 Mar 2022 18:29:14 +0100
From:   Jiri Olsa <olsajiri@...il.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Jiri Olsa <jolsa@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 07/10] libbpf: Add bpf_link_create support for multi
 kprobes

On Fri, Mar 04, 2022 at 03:11:16PM -0800, Andrii Nakryiko wrote:
> On Tue, Feb 22, 2022 at 9:07 AM Jiri Olsa <jolsa@...nel.org> wrote:
> >
> > Adding new kprobe_multi struct to bpf_link_create_opts object
> > to pass multiple kprobe data to link_create attr uapi.
> >
> > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > ---
> >  tools/lib/bpf/bpf.c | 7 +++++++
> >  tools/lib/bpf/bpf.h | 9 ++++++++-
> >  2 files changed, 15 insertions(+), 1 deletion(-)
> >
> > diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
> > index 418b259166f8..5e180def2cef 100644
> > --- a/tools/lib/bpf/bpf.c
> > +++ b/tools/lib/bpf/bpf.c
> > @@ -853,6 +853,13 @@ int bpf_link_create(int prog_fd, int target_fd,
> >                 if (!OPTS_ZEROED(opts, perf_event))
> >                         return libbpf_err(-EINVAL);
> >                 break;
> > +       case BPF_TRACE_KPROBE_MULTI:
> > +               attr.link_create.kprobe_multi.syms = OPTS_GET(opts, kprobe_multi.syms, 0);
> > +               attr.link_create.kprobe_multi.addrs = OPTS_GET(opts, kprobe_multi.addrs, 0);
> > +               attr.link_create.kprobe_multi.cookies = OPTS_GET(opts, kprobe_multi.cookies, 0);
> > +               attr.link_create.kprobe_multi.cnt = OPTS_GET(opts, kprobe_multi.cnt, 0);
> > +               attr.link_create.kprobe_multi.flags = OPTS_GET(opts, kprobe_multi.flags, 0);
> > +               break;
> >         default:
> >                 if (!OPTS_ZEROED(opts, flags))
> >                         return libbpf_err(-EINVAL);
> > diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
> > index 16b21757b8bf..bd285a8f3420 100644
> > --- a/tools/lib/bpf/bpf.h
> > +++ b/tools/lib/bpf/bpf.h
> > @@ -413,10 +413,17 @@ struct bpf_link_create_opts {
> >                 struct {
> >                         __u64 bpf_cookie;
> >                 } perf_event;
> > +               struct {
> > +                       __u64 syms;
> > +                       __u64 addrs;
> > +                       __u64 cookies;
> 
> hm, I think we can and should use proper types here, no?
> 
> const char **syms;
> const void **addrs;
> const __u64 *cookies;
> 
> ?

right, will change

thanks,
jirka