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Date: Mon, 6 Mar 2023 11:50:08 +0800
From: Menglong Dong <menglong8.dong@...il.com>
To: Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc: alan.maguire@...cle.com, ast@...nel.org, daniel@...earbox.net,
andrii@...nel.org, martin.lau@...ux.dev, song@...nel.org,
yhs@...com, john.fastabend@...il.com, kpsingh@...nel.org,
sdf@...gle.com, haoluo@...gle.com, jolsa@...nel.org,
benbjiang@...cent.com, bpf@...r.kernel.org,
linux-kernel@...r.kernel.org, Menglong Dong <imagedong@...cent.com>
Subject: Re: [PATCH bpf-next v3 3/3] selftests/bpf: add test for legacy/perf
kprobe/uprobe attach mode
On Tue, Feb 28, 2023 at 5:56 AM Andrii Nakryiko
<andrii.nakryiko@...il.com> wrote:
>
> On Mon, Feb 20, 2023 at 6:54 PM <menglong8.dong@...il.com> wrote:
> >
> > From: Menglong Dong <imagedong@...cent.com>
> >
> > Add the testing for kprobe/uprobe attaching in default, legacy, perf and
> > link mode. And the testing passed:
> >
> > ./test_progs -t attach_probe
> > $5/1 attach_probe/manual-default:OK
> > $5/2 attach_probe/manual-legacy:OK
> > $5/3 attach_probe/manual-perf:OK
> > $5/4 attach_probe/manual-link:OK
> > $5/5 attach_probe/auto:OK
> > $5/6 attach_probe/kprobe-sleepable:OK
> > $5/7 attach_probe/uprobe-lib:OK
> > $5/8 attach_probe/uprobe-sleepable:OK
> > $5/9 attach_probe/uprobe-ref_ctr:OK
> > $5 attach_probe:OK
> > Summary: 1/9 PASSED, 0 SKIPPED, 0 FAILED
> >
> > Reviewed-by: Biao Jiang <benbjiang@...cent.com>
> > Signed-off-by: Menglong Dong <imagedong@...cent.com>
> > Reviewed-by: Alan Maguire <alan.maguire@...cle.com>
> > ---
> > .../selftests/bpf/prog_tests/attach_probe.c | 54 ++++++++++++++-----
> > .../selftests/bpf/progs/test_attach_probe.c | 32 -----------
> > .../bpf/progs/test_attach_probe_manual.c | 53 ++++++++++++++++++
> > 3 files changed, 93 insertions(+), 46 deletions(-)
> > create mode 100644 tools/testing/selftests/bpf/progs/test_attach_probe_manual.c
> >
> > diff --git a/tools/testing/selftests/bpf/prog_tests/attach_probe.c b/tools/testing/selftests/bpf/prog_tests/attach_probe.c
> > index 8afd3e6066b8..e71cb44bf2e7 100644
> > --- a/tools/testing/selftests/bpf/prog_tests/attach_probe.c
> > +++ b/tools/testing/selftests/bpf/prog_tests/attach_probe.c
> > @@ -1,6 +1,7 @@
> > // SPDX-License-Identifier: GPL-2.0
> > #include <test_progs.h>
> > #include "test_attach_kprobe_sleepable.skel.h"
> > +#include "test_attach_probe_manual.skel.h"
> > #include "test_attach_probe.skel.h"
> >
> > /* this is how USDT semaphore is actually defined, except volatile modifier */
> > @@ -33,33 +34,48 @@ static noinline void trigger_func4(void)
> > static char test_data[] = "test_data";
> >
> > /* manual attach kprobe/kretprobe/uprobe/uretprobe testings */
> > -static void test_attach_probe_manual(struct test_attach_probe *skel)
> > +static void test_attach_probe_manual(enum probe_attach_mode attach_mode)
> > {
> > DECLARE_LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts);
> > + DECLARE_LIBBPF_OPTS(bpf_kprobe_opts, kprobe_opts);
> > struct bpf_link *kprobe_link, *kretprobe_link;
> > struct bpf_link *uprobe_link, *uretprobe_link;
> > + struct test_attach_probe_manual *skel;
> > ssize_t uprobe_offset;
> >
> > + skel = test_attach_probe_manual__open();
> > + if (!ASSERT_OK_PTR(skel, "skel_kprobe_manual_open"))
> > + return;
> > +
> > + if (!ASSERT_OK(test_attach_probe_manual__load(skel), "skel_manual_load"))
> > + goto cleanup;
>
> use test_attach_probe_manual__open_and_load() ?
>
Yeah, sounds nice!
> > + if (!ASSERT_OK_PTR(skel->bss, "manual_check_bss"))
> > + goto cleanup;
> > +
>
> no need to test this, lots of other tests validate this already, BPF
> skeleton has been validated many times over, no need to add this in
> new tests
>
> > uprobe_offset = get_uprobe_offset(&trigger_func);
> > if (!ASSERT_GE(uprobe_offset, 0, "uprobe_offset"))
> > - return;
> > + goto cleanup;
>
> didn't you update all the `goto cleanup;` into `return;` in previous
> patch, and now updating it back to `goto cleanup;`? Maybe just keep an
> empty `cleanup:` label at the end to reduce churn?
>
OK!
Thanks!
Menglong Dong
> >
> > /* manual-attach kprobe/kretprobe */
> > - kprobe_link = bpf_program__attach_kprobe(skel->progs.handle_kprobe,
> > - false /* retprobe */,
> > - SYS_NANOSLEEP_KPROBE_NAME);
> > + kprobe_opts.attach_mode = attach_mode;
> > + kprobe_opts.retprobe = false;
> > + kprobe_link = bpf_program__attach_kprobe_opts(skel->progs.handle_kprobe,
> > + SYS_NANOSLEEP_KPROBE_NAME,
> > + &kprobe_opts);
> > if (!ASSERT_OK_PTR(kprobe_link, "attach_kprobe"))
> > - return;
> > + goto cleanup;
> > skel->links.handle_kprobe = kprobe_link;
> >
> > - kretprobe_link = bpf_program__attach_kprobe(skel->progs.handle_kretprobe,
> > - true /* retprobe */,
> > - SYS_NANOSLEEP_KPROBE_NAME);
> > + kprobe_opts.retprobe = true;
> > + kretprobe_link = bpf_program__attach_kprobe_opts(skel->progs.handle_kretprobe,
> > + SYS_NANOSLEEP_KPROBE_NAME,
> > + &kprobe_opts);
> > if (!ASSERT_OK_PTR(kretprobe_link, "attach_kretprobe"))
> > - return;
> > + goto cleanup;
> > skel->links.handle_kretprobe = kretprobe_link;
> >
> > /* manual-attach uprobe/uretprobe */
> > + uprobe_opts.attach_mode = attach_mode;
> > uprobe_opts.ref_ctr_offset = 0;
> > uprobe_opts.retprobe = false;
> > uprobe_link = bpf_program__attach_uprobe_opts(skel->progs.handle_uprobe,
>
> [...]
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