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selftests/bpf: Update xdp_bpf2bpf test to use new set_attach_target API 

Use the new bpf_program__set_attach_target() API in the xdp_bpf2bpf
selftest so it can be referenced as an example on how to use it.

Signed-off-by: Eelco Chaudron <echaudro@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/158220520562.127661.14289388017034825841.stgit@xdp-tutorial
This commit is contained in:
Eelco Chaudron 2020-02-20 13:26:45 +00:00 committed by Alexei Starovoitov
parent ff26ce5cd7
commit 933ce62d68
2 changed files with 15 additions and 5 deletions
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16
tools/testing/selftests/bpf/prog_tests/xdp_bpf2bpf.c
View File

@ -14,7 +14,7 @@ void test_xdp_bpf2bpf(void)
struct test_xdp *pkt_skel = NULL;
struct test_xdp_bpf2bpf *ftrace_skel = NULL;
struct vip key4 = {.protocol = 6, .family = AF_INET};
DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts);
struct bpf_program *prog;
/* Load XDP program to introspect */
pkt_skel = test_xdp__open_and_load();
@ -27,11 +27,21 @@ void test_xdp_bpf2bpf(void)
bpf_map_update_elem(map_fd, &key4, &value4, 0);
/* Load trace program */
opts.attach_prog_fd = pkt_fd,
ftrace_skel = test_xdp_bpf2bpf__open_opts(&opts);
ftrace_skel = test_xdp_bpf2bpf__open();
if (CHECK(!ftrace_skel, "__open", "ftrace skeleton failed\n"))
goto out;
/* Demonstrate the bpf_program__set_attach_target() API rather than
* the load with options, i.e. opts.attach_prog_fd.
*/
prog = ftrace_skel->progs.trace_on_entry;
bpf_program__set_expected_attach_type(prog, BPF_TRACE_FENTRY);
bpf_program__set_attach_target(prog, pkt_fd, "_xdp_tx_iptunnel");
prog = ftrace_skel->progs.trace_on_exit;
bpf_program__set_expected_attach_type(prog, BPF_TRACE_FEXIT);
bpf_program__set_attach_target(prog, pkt_fd, "_xdp_tx_iptunnel");
err = test_xdp_bpf2bpf__load(ftrace_skel);
if (CHECK(err, "__load", "ftrace skeleton failed\n"))
goto out;

4
tools/testing/selftests/bpf/progs/test_xdp_bpf2bpf.c
View File

@ -28,7 +28,7 @@ struct xdp_buff {
} __attribute__((preserve_access_index));
__u64 test_result_fentry = 0;
SEC("fentry/_xdp_tx_iptunnel")
SEC("fentry/FUNC")
int BPF_PROG(trace_on_entry, struct xdp_buff *xdp)
{
test_result_fentry = xdp->rxq->dev->ifindex;
@ -36,7 +36,7 @@ int BPF_PROG(trace_on_entry, struct xdp_buff *xdp)
}
__u64 test_result_fexit = 0;
SEC("fexit/_xdp_tx_iptunnel")
SEC("fexit/FUNC")
int BPF_PROG(trace_on_exit, struct xdp_buff *xdp, int ret)
{
test_result_fexit = ret;