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

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Date:   Thu, 22 Jul 2021 09:34:27 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Fugang Duan <fugang.duan@....com>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>, kernel@...gutronix.de,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-imx@....com,
        Fabio Estevam <festevam@...il.com>,
        David Jander <david@...tonic.nl>,
        Russell King <linux@...linux.org.uk>,
        Philippe Schenker <philippe.schenker@...adex.com>
Subject: [PATCH net-next v1 1/1] net: selftests: add MTU test

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@...gutronix.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