selftests/bpf: test_xsk: Add return value to init_iface()

init_iface() doesn't have any return value while it can fail. In case of
failure it calls exit_on_error() which exits the application
immediately. This prevents the following tests from being run and isn't
compliant with the CI

Add a return value to init_iface() so errors can be handled more
smoothly.

Reviewed-by: Maciej Fijalkowski <[email protected]>
Signed-off-by: Bastien Curutchet (eBPF Foundation) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>

Author: bastien-curutchet

tools/testing/selftests/bpf/test_xsk.c

@@ -2189,7 +2189,7 @@ static bool hugepages_present(void)
 	return true;
 }
 
-void init_iface(struct ifobject *ifobj, thread_func_t func_ptr)
+int init_iface(struct ifobject *ifobj, thread_func_t func_ptr)
 {
 	LIBBPF_OPTS(bpf_xdp_query_opts, query_opts);
 	int err;
@@ -2199,7 +2199,7 @@ void init_iface(struct ifobject *ifobj, thread_func_t func_ptr)
 	err = xsk_load_xdp_programs(ifobj);
 	if (err) {
 		ksft_print_msg("Error loading XDP program\n");
-		exit_with_error(err);
+		return err;
 	}
 
 	if (hugepages_present())
@@ -2208,7 +2208,7 @@ void init_iface(struct ifobject *ifobj, thread_func_t func_ptr)
 	err = bpf_xdp_query(ifobj->ifindex, XDP_FLAGS_DRV_MODE, &query_opts);
 	if (err) {
 		ksft_print_msg("Error querying XDP capabilities\n");
-		exit_with_error(-err);
+		return err;
 	}
 	if (query_opts.feature_flags & NETDEV_XDP_ACT_RX_SG)
 		ifobj->multi_buff_supp = true;
@@ -2220,6 +2220,8 @@ void init_iface(struct ifobject *ifobj, thread_func_t func_ptr)
 			ifobj->xdp_zc_max_segs = 0;
 		}
 	}
+
+	return 0;
 }
 
 int testapp_send_receive(struct test_spec *test)

tools/testing/selftests/bpf/test_xsk.h

@@ -137,7 +137,7 @@ struct ifobject {
 };
 struct ifobject *ifobject_create(void);
 void ifobject_delete(struct ifobject *ifobj);
-void init_iface(struct ifobject *ifobj, thread_func_t func_ptr);
+int init_iface(struct ifobject *ifobj, thread_func_t func_ptr);
 
 int xsk_configure_umem(struct ifobject *ifobj, struct xsk_umem_info *umem, void *buffer, u64 size);
 int xsk_configure_socket(struct xsk_socket_info *xsk, struct xsk_umem_info *umem,

tools/testing/selftests/bpf/xskxceiver.c

@@ -373,8 +373,11 @@ int main(int argc, char **argv)
 		ifobj_tx->set_ring.default_rx = ifobj_tx->ring.rx_pending;
 	}
 
-	init_iface(ifobj_rx, worker_testapp_validate_rx);
-	init_iface(ifobj_tx, worker_testapp_validate_tx);
+	if (init_iface(ifobj_rx, worker_testapp_validate_rx) ||
+	    init_iface(ifobj_tx, worker_testapp_validate_tx)) {
+		ksft_print_msg("Error : can't initialize interfaces\n");
+		ksft_exit_xfail();
+	}
 
 	test_init(&test, ifobj_tx, ifobj_rx, 0, &tests[0]);
 	tx_pkt_stream_default = pkt_stream_generate(DEFAULT_PKT_CNT, MIN_PKT_SIZE);