selftests/xsk: merge dual and single thread dispatchers

Make the thread dispatching code common by unifying the dual and
single thread dispatcher code. This so we do not have to add code in
two places in upcoming commits.
Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Acked-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Link: https://lore.kernel.org/r/20230111093526.11682-14-magnus.karlsson@gmail.comSigned-off-by: Alexei Starovoitov <ast@kernel.org>

tools/testing/selftests/bpf/xskxceiver.c

@@ -1356,83 +1356,59 @@ static void handler(int signum)
 	pthread_exit(NULL);
 }
 
-static int testapp_validate_traffic_single_thread(struct test_spec *test, struct ifobject *ifobj,
-						  enum test_type type)
+static int __testapp_validate_traffic(struct test_spec *test, struct ifobject *ifobj1,
+				      struct ifobject *ifobj2)
 {
-	bool old_shared_umem = ifobj->shared_umem;
-	pthread_t t0;
+	pthread_t t0, t1;
 
+	if (ifobj2)
 		if (pthread_barrier_init(&barr, NULL, 2))
 			exit_with_error(errno);
 
 	test->current_step++;
-	if (type == TEST_TYPE_POLL_RXQ_TMOUT)
-		pkt_stream_reset(ifobj->pkt_stream);
+	pkt_stream_reset(ifobj1->pkt_stream);
 	pkts_in_flight = 0;
 
-	test->ifobj_rx->shared_umem = false;
-	test->ifobj_tx->shared_umem = false;
-
 	signal(SIGUSR1, handler);
-	/* Spawn thread */
-	pthread_create(&t0, NULL, ifobj->func_ptr, test);
+	/*Spawn RX thread */
+	pthread_create(&t0, NULL, ifobj1->func_ptr, test);
 
-	if (type != TEST_TYPE_POLL_TXQ_TMOUT)
+	if (ifobj2) {
 		pthread_barrier_wait(&barr);
-
 		if (pthread_barrier_destroy(&barr))
 			exit_with_error(errno);
 
+		/*Spawn TX thread */
+		pthread_create(&t1, NULL, ifobj2->func_ptr, test);
+
+		pthread_join(t1, NULL);
+	}
+
+	if (!ifobj2)
 		pthread_kill(t0, SIGUSR1);
+	else
 		pthread_join(t0, NULL);
 
 	if (test->total_steps == test->current_step || test->fail) {
-		xsk_socket__delete(ifobj->xsk->xsk);
-		xsk_clear_xskmap(ifobj->xskmap);
-		testapp_clean_xsk_umem(ifobj);
+		if (ifobj2)
+			xsk_socket__delete(ifobj2->xsk->xsk);
+		xsk_socket__delete(ifobj1->xsk->xsk);
+		testapp_clean_xsk_umem(ifobj1);
+		if (ifobj2 && !ifobj2->shared_umem)
+			testapp_clean_xsk_umem(ifobj2);
 	}
 
-	test->ifobj_rx->shared_umem = old_shared_umem;
-	test->ifobj_tx->shared_umem = old_shared_umem;
-
 	return !!test->fail;
 }
 
 static int testapp_validate_traffic(struct test_spec *test)
 {
-	struct ifobject *ifobj_tx = test->ifobj_tx;
-	struct ifobject *ifobj_rx = test->ifobj_rx;
-	pthread_t t0, t1;
-
-	if (pthread_barrier_init(&barr, NULL, 2))
-		exit_with_error(errno);
-
-	test->current_step++;
-	pkt_stream_reset(ifobj_rx->pkt_stream);
-	pkts_in_flight = 0;
-
-	/*Spawn RX thread */
-	pthread_create(&t0, NULL, ifobj_rx->func_ptr, test);
-
-	pthread_barrier_wait(&barr);
-	if (pthread_barrier_destroy(&barr))
-		exit_with_error(errno);
-
-	/*Spawn TX thread */
-	pthread_create(&t1, NULL, ifobj_tx->func_ptr, test);
-
-	pthread_join(t1, NULL);
-	pthread_join(t0, NULL);
-
-	if (test->total_steps == test->current_step || test->fail) {
-		xsk_socket__delete(ifobj_tx->xsk->xsk);
-		xsk_socket__delete(ifobj_rx->xsk->xsk);
-		testapp_clean_xsk_umem(ifobj_rx);
-		if (!ifobj_tx->shared_umem)
-			testapp_clean_xsk_umem(ifobj_tx);
-	}
+	return __testapp_validate_traffic(test, test->ifobj_rx, test->ifobj_tx);
+}
 
-	return !!test->fail;
+static int testapp_validate_traffic_single_thread(struct test_spec *test, struct ifobject *ifobj)
+{
+	return __testapp_validate_traffic(test, ifobj, NULL);
 }
 
 static void testapp_teardown(struct test_spec *test)
@@ -1674,6 +1650,26 @@ static void testapp_xdp_drop(struct test_spec *test)
 	}
 }
 
+static void testapp_poll_txq_tmout(struct test_spec *test)
+{
+	test_spec_set_name(test, "POLL_TXQ_FULL");
+
+	test->ifobj_tx->use_poll = true;
+	/* create invalid frame by set umem frame_size and pkt length equal to 2048 */
+	test->ifobj_tx->umem->frame_size = 2048;
+	pkt_stream_replace(test, 2 * DEFAULT_PKT_CNT, 2048);
+	testapp_validate_traffic_single_thread(test, test->ifobj_tx);
+
+	pkt_stream_restore_default(test);
+}
+
+static void testapp_poll_rxq_tmout(struct test_spec *test)
+{
+	test_spec_set_name(test, "POLL_RXQ_EMPTY");
+	test->ifobj_rx->use_poll = true;
+	testapp_validate_traffic_single_thread(test, test->ifobj_rx);
+}
+
 static int xsk_load_xdp_programs(struct ifobject *ifobj)
 {
 	ifobj->xdp_progs = xsk_xdp_progs__open_and_load();
@@ -1784,18 +1780,10 @@ static void run_pkt_test(struct test_spec *test, enum test_mode mode, enum test_
 		testapp_validate_traffic(test);
 		break;
 	case TEST_TYPE_POLL_TXQ_TMOUT:
-		test_spec_set_name(test, "POLL_TXQ_FULL");
-		test->ifobj_tx->use_poll = true;
-		/* create invalid frame by set umem frame_size and pkt length equal to 2048 */
-		test->ifobj_tx->umem->frame_size = 2048;
-		pkt_stream_replace(test, 2 * DEFAULT_PKT_CNT, 2048);
-		testapp_validate_traffic_single_thread(test, test->ifobj_tx, type);
-		pkt_stream_restore_default(test);
+		testapp_poll_txq_tmout(test);
 		break;
 	case TEST_TYPE_POLL_RXQ_TMOUT:
-		test_spec_set_name(test, "POLL_RXQ_EMPTY");
-		test->ifobj_rx->use_poll = true;
-		testapp_validate_traffic_single_thread(test, test->ifobj_rx, type);
+		testapp_poll_rxq_tmout(test);
 		break;
 	case TEST_TYPE_ALIGNED_INV_DESC:
 		test_spec_set_name(test, "ALIGNED_INV_DESC");