[PATCH] net: dsa: vsc73xx: fix MTU configuration

[Pawel Dembicki <paweldembicki@gmail.com>]

Switch in MAXLEN register stores the maximum size of a data frame.
The MTU size is 18 bytes smaller than the frame size.

The current settings are causing problems with packet forwarding.
This patch fixes the MTU settings to proper values.

Fixes: fb77ffc6ec86 ("net: dsa: vsc73xx: make the MTU configurable")
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>

---
In my first attempt, I sent it to net-next [0], but I was asked to resend
it to net.

[0]https://lore.kernel.org/netdev/20230625115343.1603330-7-paweldembicki@gmail.com/

 drivers/net/dsa/vitesse-vsc73xx-core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/dsa/vitesse-vsc73xx-core.c b/drivers/net/dsa/vitesse-vsc73xx-core.c
index ae55167ce0a6..ef1a4a7c47b2 100644
--- a/drivers/net/dsa/vitesse-vsc73xx-core.c
+++ b/drivers/net/dsa/vitesse-vsc73xx-core.c
@@ -1025,17 +1025,17 @@ static int vsc73xx_change_mtu(struct dsa_switch *ds, int port, int new_mtu)
 	struct vsc73xx *vsc = ds->priv;
 
 	return vsc73xx_write(vsc, VSC73XX_BLOCK_MAC, port,
-			     VSC73XX_MAXLEN, new_mtu);
+			     VSC73XX_MAXLEN, new_mtu + ETH_HLEN + ETH_FCS_LEN);
 }
 
 /* According to application not "VSC7398 Jumbo Frames" setting
- * up the MTU to 9.6 KB does not affect the performance on standard
+ * up the frame size to 9.6 KB does not affect the performance on standard
  * frames. It is clear from the application note that
  * "9.6 kilobytes" == 9600 bytes.
  */
 static int vsc73xx_get_max_mtu(struct dsa_switch *ds, int port)
 {
-	return 9600;
+	return 9600 - ETH_HLEN - ETH_FCS_LEN;
 }
 
 static const struct dsa_switch_ops vsc73xx_ds_ops = {
-- 
2.34.1