xdp_cpumap_attach, in its current form, only checks that an xdp cpumap program can be executed, but not that it performs correctly the cpu redirect as configured by userspace (bpf_prog_test_run_opts will return success even if the redirect program returns an error)
Add a check to ensure that the program performs the configured redirect as well. The check is based on a global variable incremented by a chained program executed only if the redirect program properly executes.
Signed-off-by: Alexis Lothoré (eBPF Foundation) alexis.lothore@bootlin.com --- Changes in v3: - new patch --- tools/testing/selftests/bpf/prog_tests/xdp_cpumap_attach.c | 10 ++++++++-- .../testing/selftests/bpf/progs/test_xdp_with_cpumap_helpers.c | 5 +++++ 2 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_cpumap_attach.c b/tools/testing/selftests/bpf/prog_tests/xdp_cpumap_attach.c index 31c225f0239613f6b5adad36b5b0e6e85eeddd9a..57d1661dc72aeb152c7cb9c2f63e3b47bf1799d8 100644 --- a/tools/testing/selftests/bpf/prog_tests/xdp_cpumap_attach.c +++ b/tools/testing/selftests/bpf/prog_tests/xdp_cpumap_attach.c @@ -62,8 +62,11 @@ static void test_xdp_with_cpumap_helpers(void) err = bpf_prog_test_run_opts(prog_redir_fd, &opts); ASSERT_OK(err, "XDP test run");
- /* wait for the packets to be flushed */ + /* wait for the packets to be flushed, then check that redirect has been + * performed + */ kern_sync_rcu(); + ASSERT_NEQ(skel->bss->redirect_count, 0, "redirected packets");
err = bpf_xdp_detach(IFINDEX_LO, XDP_FLAGS_SKB_MODE, NULL); ASSERT_OK(err, "XDP program detach"); @@ -203,8 +206,11 @@ static void test_xdp_with_cpumap_helpers_veth(void) err = bpf_prog_test_run_opts(cm_fd_redir, &opts); ASSERT_OK(err, "XDP test run");
- /* wait for the packets to be flushed */ + /* wait for the packets to be flushed, then check that redirect has been + * performed + */ kern_sync_rcu(); + ASSERT_NEQ(skel->bss->redirect_count, 0, "redirected packets");
err = bpf_xdp_detach(ifindex_src, XDP_FLAGS_DRV_MODE, NULL); ASSERT_OK(err, "XDP program detach"); diff --git a/tools/testing/selftests/bpf/progs/test_xdp_with_cpumap_helpers.c b/tools/testing/selftests/bpf/progs/test_xdp_with_cpumap_helpers.c index d848fe96924e32a72e1e0327e3afffeb349b933e..3619239b01b741dfd81bbebf5d9a62e0cf71e4f4 100644 --- a/tools/testing/selftests/bpf/progs/test_xdp_with_cpumap_helpers.c +++ b/tools/testing/selftests/bpf/progs/test_xdp_with_cpumap_helpers.c @@ -12,6 +12,8 @@ struct { __uint(max_entries, 4); } cpu_map SEC(".maps");
+__u32 redirect_count = 0; + SEC("xdp") int xdp_redir_prog(struct xdp_md *ctx) { @@ -27,6 +29,9 @@ int xdp_dummy_prog(struct xdp_md *ctx) SEC("xdp/cpumap") int xdp_dummy_cm(struct xdp_md *ctx) { + if (bpf_get_smp_processor_id() == 0) + redirect_count++; + if (ctx->ingress_ifindex == IFINDEX_LO) return XDP_DROP;