Adding support to attach program in uprobe session mode
with bpf_program__attach_uprobe_multi function.
Adding session bool to bpf_uprobe_multi_opts struct that allows
to load and attach the bpf program via uprobe session.
the attachment to create uprobe multi session.
Also adding new program loader section that allows:
SEC("uprobe.session/bpf_fentry_test*")
and loads/attaches uprobe program as uprobe session.
Adding sleepable hook (uprobe.session.s) as well.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/lib/bpf/bpf.c | 1 +
tools/lib/bpf/libbpf.c | 21 ++++++++++++++++++---
tools/lib/bpf/libbpf.h | 4 +++-
3 files changed, 22 insertions(+), 4 deletions(-)
diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index 2a4c71501a17..becdfa701c75 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -776,6 +776,7 @@ int bpf_link_create(int prog_fd, int target_fd,
return libbpf_err(-EINVAL);
break;
case BPF_TRACE_UPROBE_MULTI:
+ case BPF_TRACE_UPROBE_SESSION:
attr.link_create.uprobe_multi.flags = OPTS_GET(opts, uprobe_multi.flags, 0);
attr.link_create.uprobe_multi.cnt = OPTS_GET(opts, uprobe_multi.cnt, 0);
attr.link_create.uprobe_multi.path = ptr_to_u64(OPTS_GET(opts, uprobe_multi.path, 0));
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 3587ed7ec359..563ff5e64269 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -9410,8 +9410,10 @@ static const struct bpf_sec_def section_defs[] = {
SEC_DEF("kprobe.session+", KPROBE, BPF_TRACE_KPROBE_SESSION, SEC_NONE, attach_kprobe_session),
SEC_DEF("uprobe.multi+", KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_NONE, attach_uprobe_multi),
SEC_DEF("uretprobe.multi+", KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_NONE, attach_uprobe_multi),
+ SEC_DEF("uprobe.session+", KPROBE, BPF_TRACE_UPROBE_SESSION, SEC_NONE, attach_uprobe_multi),
SEC_DEF("uprobe.multi.s+", KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_SLEEPABLE, attach_uprobe_multi),
SEC_DEF("uretprobe.multi.s+", KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_SLEEPABLE, attach_uprobe_multi),
+ SEC_DEF("uprobe.session.s+", KPROBE, BPF_TRACE_UPROBE_SESSION, SEC_SLEEPABLE, attach_uprobe_multi),
SEC_DEF("ksyscall+", KPROBE, 0, SEC_NONE, attach_ksyscall),
SEC_DEF("kretsyscall+", KPROBE, 0, SEC_NONE, attach_ksyscall),
SEC_DEF("usdt+", KPROBE, 0, SEC_USDT, attach_usdt),
@@ -11733,7 +11735,10 @@ static int attach_uprobe_multi(const struct bpf_program *prog, long cookie, stru
ret = 0;
break;
case 3:
- opts.retprobe = str_has_pfx(probe_type, "uretprobe.multi");
+ if (str_has_pfx(probe_type, "uprobe.session"))
+ opts.session = true;
+ else
+ opts.retprobe = str_has_pfx(probe_type, "uretprobe.multi");
*link = bpf_program__attach_uprobe_multi(prog, -1, binary_path, func_name, &opts);
ret = libbpf_get_error(*link);
break;
@@ -11982,10 +11987,12 @@ bpf_program__attach_uprobe_multi(const struct bpf_program *prog,
const unsigned long *ref_ctr_offsets = NULL, *offsets = NULL;
LIBBPF_OPTS(bpf_link_create_opts, lopts);
unsigned long *resolved_offsets = NULL;
+ enum bpf_attach_type attach_type;
int err = 0, link_fd, prog_fd;
struct bpf_link *link = NULL;
char errmsg[STRERR_BUFSIZE];
char full_path[PATH_MAX];
+ bool retprobe, session;
const __u64 *cookies;
const char **syms;
size_t cnt;
@@ -12056,12 +12063,20 @@ bpf_program__attach_uprobe_multi(const struct bpf_program *prog,
offsets = resolved_offsets;
}
+ retprobe = OPTS_GET(opts, retprobe, false);
+ session = OPTS_GET(opts, session, false);
+
+ if (retprobe && session)
+ return libbpf_err_ptr(-EINVAL);
+
+ attach_type = session ? BPF_TRACE_UPROBE_SESSION : BPF_TRACE_UPROBE_MULTI;
+
lopts.uprobe_multi.path = path;
lopts.uprobe_multi.offsets = offsets;
lopts.uprobe_multi.ref_ctr_offsets = ref_ctr_offsets;
lopts.uprobe_multi.cookies = cookies;
lopts.uprobe_multi.cnt = cnt;
- lopts.uprobe_multi.flags = OPTS_GET(opts, retprobe, false) ? BPF_F_UPROBE_MULTI_RETURN : 0;
+ lopts.uprobe_multi.flags = retprobe ? BPF_F_UPROBE_MULTI_RETURN : 0;
if (pid == 0)
pid = getpid();
@@ -12075,7 +12090,7 @@ bpf_program__attach_uprobe_multi(const struct bpf_program *prog,
}
link->detach = &bpf_link__detach_fd;
- link_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_UPROBE_MULTI, &lopts);
+ link_fd = bpf_link_create(prog_fd, 0, attach_type, &lopts);
if (link_fd < 0) {
err = -errno;
pr_warn("prog '%s': failed to attach multi-uprobe: %s\n",
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index 91484303849c..b2ce3a72b11d 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -577,10 +577,12 @@ struct bpf_uprobe_multi_opts {
size_t cnt;
/* create return uprobes */
bool retprobe;
+ /* create session kprobes */
+ bool session;
size_t :0;
};
-#define bpf_uprobe_multi_opts__last_field retprobe
+#define bpf_uprobe_multi_opts__last_field session
/**
* @brief **bpf_program__attach_uprobe_multi()** attaches a BPF program
--
2.46.1On Sun, Sep 29, 2024 at 1:58 PM Jiri Olsa <jolsa@kernel.org> wrote:
>
> Adding support to attach program in uprobe session mode
> with bpf_program__attach_uprobe_multi function.
>
> Adding session bool to bpf_uprobe_multi_opts struct that allows
> to load and attach the bpf program via uprobe session.
> the attachment to create uprobe multi session.
>
> Also adding new program loader section that allows:
> SEC("uprobe.session/bpf_fentry_test*")
>
> and loads/attaches uprobe program as uprobe session.
>
> Adding sleepable hook (uprobe.session.s) as well.
>
> Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> ---
> tools/lib/bpf/bpf.c | 1 +
> tools/lib/bpf/libbpf.c | 21 ++++++++++++++++++---
> tools/lib/bpf/libbpf.h | 4 +++-
> 3 files changed, 22 insertions(+), 4 deletions(-)
>
LGTM, though see the nit below
Acked-by: Andrii Nakryiko <andrii@kernel.org>
> diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
> index 2a4c71501a17..becdfa701c75 100644
> --- a/tools/lib/bpf/bpf.c
> +++ b/tools/lib/bpf/bpf.c
> @@ -776,6 +776,7 @@ int bpf_link_create(int prog_fd, int target_fd,
> return libbpf_err(-EINVAL);
> break;
> case BPF_TRACE_UPROBE_MULTI:
> + case BPF_TRACE_UPROBE_SESSION:
> attr.link_create.uprobe_multi.flags = OPTS_GET(opts, uprobe_multi.flags, 0);
> attr.link_create.uprobe_multi.cnt = OPTS_GET(opts, uprobe_multi.cnt, 0);
> attr.link_create.uprobe_multi.path = ptr_to_u64(OPTS_GET(opts, uprobe_multi.path, 0));
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index 3587ed7ec359..563ff5e64269 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -9410,8 +9410,10 @@ static const struct bpf_sec_def section_defs[] = {
> SEC_DEF("kprobe.session+", KPROBE, BPF_TRACE_KPROBE_SESSION, SEC_NONE, attach_kprobe_session),
> SEC_DEF("uprobe.multi+", KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_NONE, attach_uprobe_multi),
> SEC_DEF("uretprobe.multi+", KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_NONE, attach_uprobe_multi),
> + SEC_DEF("uprobe.session+", KPROBE, BPF_TRACE_UPROBE_SESSION, SEC_NONE, attach_uprobe_multi),
> SEC_DEF("uprobe.multi.s+", KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_SLEEPABLE, attach_uprobe_multi),
> SEC_DEF("uretprobe.multi.s+", KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_SLEEPABLE, attach_uprobe_multi),
> + SEC_DEF("uprobe.session.s+", KPROBE, BPF_TRACE_UPROBE_SESSION, SEC_SLEEPABLE, attach_uprobe_multi),
> SEC_DEF("ksyscall+", KPROBE, 0, SEC_NONE, attach_ksyscall),
> SEC_DEF("kretsyscall+", KPROBE, 0, SEC_NONE, attach_ksyscall),
> SEC_DEF("usdt+", KPROBE, 0, SEC_USDT, attach_usdt),
> @@ -11733,7 +11735,10 @@ static int attach_uprobe_multi(const struct bpf_program *prog, long cookie, stru
> ret = 0;
> break;
> case 3:
> - opts.retprobe = str_has_pfx(probe_type, "uretprobe.multi");
> + if (str_has_pfx(probe_type, "uprobe.session"))
> + opts.session = true;
> + else
> + opts.retprobe = str_has_pfx(probe_type, "uretprobe.multi");
nit: this is very non-uniform, can you please just do:
opts.session = str_has_pfx(probe_type, "uprobe.session");
opts.retprobe = str_has_pfx(probe_type, "uretprobe.multi");
There is no need to micro-optimize str_has_pfx() calls, IMO.
> *link = bpf_program__attach_uprobe_multi(prog, -1, binary_path, func_name, &opts);
> ret = libbpf_get_error(*link);
> break;
[...]
On Mon, Sep 30, 2024 at 02:36:35PM -0700, Andrii Nakryiko wrote:
> On Sun, Sep 29, 2024 at 1:58 PM Jiri Olsa <jolsa@kernel.org> wrote:
> >
> > Adding support to attach program in uprobe session mode
> > with bpf_program__attach_uprobe_multi function.
> >
> > Adding session bool to bpf_uprobe_multi_opts struct that allows
> > to load and attach the bpf program via uprobe session.
> > the attachment to create uprobe multi session.
> >
> > Also adding new program loader section that allows:
> > SEC("uprobe.session/bpf_fentry_test*")
> >
> > and loads/attaches uprobe program as uprobe session.
> >
> > Adding sleepable hook (uprobe.session.s) as well.
> >
> > Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> > ---
> > tools/lib/bpf/bpf.c | 1 +
> > tools/lib/bpf/libbpf.c | 21 ++++++++++++++++++---
> > tools/lib/bpf/libbpf.h | 4 +++-
> > 3 files changed, 22 insertions(+), 4 deletions(-)
> >
>
> LGTM, though see the nit below
>
> Acked-by: Andrii Nakryiko <andrii@kernel.org>
>
> > diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
> > index 2a4c71501a17..becdfa701c75 100644
> > --- a/tools/lib/bpf/bpf.c
> > +++ b/tools/lib/bpf/bpf.c
> > @@ -776,6 +776,7 @@ int bpf_link_create(int prog_fd, int target_fd,
> > return libbpf_err(-EINVAL);
> > break;
> > case BPF_TRACE_UPROBE_MULTI:
> > + case BPF_TRACE_UPROBE_SESSION:
> > attr.link_create.uprobe_multi.flags = OPTS_GET(opts, uprobe_multi.flags, 0);
> > attr.link_create.uprobe_multi.cnt = OPTS_GET(opts, uprobe_multi.cnt, 0);
> > attr.link_create.uprobe_multi.path = ptr_to_u64(OPTS_GET(opts, uprobe_multi.path, 0));
> > diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> > index 3587ed7ec359..563ff5e64269 100644
> > --- a/tools/lib/bpf/libbpf.c
> > +++ b/tools/lib/bpf/libbpf.c
> > @@ -9410,8 +9410,10 @@ static const struct bpf_sec_def section_defs[] = {
> > SEC_DEF("kprobe.session+", KPROBE, BPF_TRACE_KPROBE_SESSION, SEC_NONE, attach_kprobe_session),
> > SEC_DEF("uprobe.multi+", KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_NONE, attach_uprobe_multi),
> > SEC_DEF("uretprobe.multi+", KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_NONE, attach_uprobe_multi),
> > + SEC_DEF("uprobe.session+", KPROBE, BPF_TRACE_UPROBE_SESSION, SEC_NONE, attach_uprobe_multi),
> > SEC_DEF("uprobe.multi.s+", KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_SLEEPABLE, attach_uprobe_multi),
> > SEC_DEF("uretprobe.multi.s+", KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_SLEEPABLE, attach_uprobe_multi),
> > + SEC_DEF("uprobe.session.s+", KPROBE, BPF_TRACE_UPROBE_SESSION, SEC_SLEEPABLE, attach_uprobe_multi),
> > SEC_DEF("ksyscall+", KPROBE, 0, SEC_NONE, attach_ksyscall),
> > SEC_DEF("kretsyscall+", KPROBE, 0, SEC_NONE, attach_ksyscall),
> > SEC_DEF("usdt+", KPROBE, 0, SEC_USDT, attach_usdt),
> > @@ -11733,7 +11735,10 @@ static int attach_uprobe_multi(const struct bpf_program *prog, long cookie, stru
> > ret = 0;
> > break;
> > case 3:
> > - opts.retprobe = str_has_pfx(probe_type, "uretprobe.multi");
> > + if (str_has_pfx(probe_type, "uprobe.session"))
> > + opts.session = true;
> > + else
> > + opts.retprobe = str_has_pfx(probe_type, "uretprobe.multi");
>
> nit: this is very non-uniform, can you please just do:
>
> opts.session = str_has_pfx(probe_type, "uprobe.session");
> opts.retprobe = str_has_pfx(probe_type, "uretprobe.multi");
>
> There is no need to micro-optimize str_has_pfx() calls, IMO.
sure, will change
thanks,
jirka
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