On Tue, Nov 20, 2018 at 3:35 AM Lorenz Bauer <lmb@xxxxxxxxxxxxxx> wrote:
>
> On Sun, 18 Nov 2018 at 05:59, Y Song <ys114321@xxxxxxxxx> wrote:
> >
> > On Fri, Nov 16, 2018 at 12:55 PM Lorenz Bauer <lmb@xxxxxxxxxxxxxx> wrote:
> > >
> > > Make sure that bpf_prog_test_run returns the correct length
> > > in the size_out argument and that the kernel respects the
> > > output size hint.
> > >
> > > Signed-off-by: Lorenz Bauer <lmb@xxxxxxxxxxxxxx>
> > > ---
> > > tools/testing/selftests/bpf/test_progs.c | 34 ++++++++++++++++++++++++
> > > 1 file changed, 34 insertions(+)
> > >
> > > diff --git a/tools/testing/selftests/bpf/test_progs.c b/tools/testing/selftests/bpf/test_progs.c
> > > index 560d7527b86b..6ab98e10e86f 100644
> > > --- a/tools/testing/selftests/bpf/test_progs.c
> > > +++ b/tools/testing/selftests/bpf/test_progs.c
> > > @@ -124,6 +124,39 @@ static void test_pkt_access(void)
> > > bpf_object__close(obj);
> > > }
> > >
> > > +static void test_output_size_hint(void)
> > > +{
> > > + const char *file = "./test_pkt_access.o";
> > > + struct bpf_object *obj;
> > > + __u32 retval, size, duration;
> > > + int err, prog_fd;
> > > + char buf[10];
> > > +
> > > + err = bpf_prog_load(file, BPF_PROG_TYPE_SCHED_CLS, &obj, &prog_fd);
> > > + if (err) {
> > > + error_cnt++;
> > > + return;
> > > + }
> > CHECK can also be used here.
> > if (CHECK(...)) {
> > goto done;
> > }
> > where label "done" is right before bpf_object__close.
>
> I just copied this part from test_pkt_access, happy to change it though.
> However, I think "goto done" would lead to freeing an unallocated
> object in this case?
Right, you can just return here.
>
> --
> Lorenz Bauer | Systems Engineer
> 25 Lavington St., London SE1 0NZ
>
> www.cloudflare.com
