selftests: extend zerocopy tests to udp

Both msg_zerocopy and udpgso_bench have udp zerocopy variants.
Exercise these as part of the standard kselftest run.

With udp, msg_zerocopy has no control channel. Ensure that the
receiver exits after the sender by accounting for the initial
delay in starting them (in msg_zerocopy.sh).
Signed-off-by: NWillem de Bruijn <willemb@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

tools/testing/selftests/net/msg_zerocopy.c

@@ -651,12 +651,13 @@ static void do_flush_datagram(int fd, int type)
 
 static void do_rx(int domain, int type, int protocol)
 {
+	const int cfg_receiver_wait_ms = 400;
 	uint64_t tstop;
 	int fd;
 
 	fd = do_setup_rx(domain, type, protocol);
 
-	tstop = gettimeofday_ms() + cfg_runtime_ms;
+	tstop = gettimeofday_ms() + cfg_runtime_ms + cfg_receiver_wait_ms;
 	do {
 		if (type == SOCK_STREAM)
 			do_flush_tcp(fd);

tools/testing/selftests/net/msg_zerocopy.sh

@@ -25,6 +25,8 @@ readonly path_sysctl_mem="net.core.optmem_max"
 if [[ "$#" -eq "0" ]]; then
 	$0 4 tcp -t 1
 	$0 6 tcp -t 1
+	$0 4 udp -t 1
+	$0 6 udp -t 1
 	echo "OK. All tests passed"
 	exit 0
 fi

tools/testing/selftests/net/udpgso_bench.sh

@@ -35,6 +35,9 @@ run_udp() {
 
 	echo "udp gso"
 	run_in_netns ${args} -S 0
+
+	echo "udp gso zerocopy"
+	run_in_netns ${args} -S 0 -z
 }
 
 run_tcp() {