[PATCH net-next v1 1/1] net: selftests: add MTU test

[Oleksij Rempel <o.rempel@pengutronix.de>]

Test if we actually can send/receive packets with MTU size. This kind of
issue was detected on ASIX HW with bogus EEPROM.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 net/core/selftests.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/net/core/selftests.c b/net/core/selftests.c
index ba7b0171974c..9077fa969892 100644
--- a/net/core/selftests.c
+++ b/net/core/selftests.c
@@ -318,6 +318,15 @@ static int net_test_phy_loopback_udp(struct net_device *ndev)
 	return __net_test_loopback(ndev, &attr);
 }
 
+static int net_test_phy_loopback_udp_mtu(struct net_device *ndev)
+{
+	struct net_packet_attrs attr = { };
+
+	attr.dst = ndev->dev_addr;
+	attr.max_size = ndev->mtu;
+	return __net_test_loopback(ndev, &attr);
+}
+
 static int net_test_phy_loopback_tcp(struct net_device *ndev)
 {
 	struct net_packet_attrs attr = { };
@@ -344,6 +353,9 @@ static const struct net_test {
 	}, {
 		.name = "PHY internal loopback, UDP    ",
 		.fn = net_test_phy_loopback_udp,
+	}, {
+		.name = "PHY internal loopback, MTU    ",
+		.fn = net_test_phy_loopback_udp_mtu,
 	}, {
 		.name = "PHY internal loopback, TCP    ",
 		.fn = net_test_phy_loopback_tcp,
-- 
2.30.2