net: gemini: Indicate that we can handle jumboframes

The hardware supposedly handles frames up to 10236 bytes and
implements .ndo_change_mtu() so accept 10236 minus the ethernet
header for a VLAN tagged frame on the netdevices. Use
ETH_MIN_MTU as minimum MTU.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/cortina/gemini.c b/drivers/net/ethernet/cortina/gemini.c
index 050fffb77d11ad3ff923cc040e9c141840587c3e..1c9ad3630c7754b692079c19ffafec7c07922c80 100644 (file)
--- a/drivers/net/ethernet/cortina/gemini.c
+++ b/drivers/net/ethernet/cortina/gemini.c
@@ -2476,6 +2476,11 @@ static int gemini_ethernet_port_probe(struct platform_device *pdev)
 
        netdev->hw_features = GMAC_OFFLOAD_FEATURES;
        netdev->features |= GMAC_OFFLOAD_FEATURES | NETIF_F_GRO;
+       /* We can handle jumbo frames up to 10236 bytes so, let's accept
+        * payloads of 10236 bytes minus VLAN and ethernet header
+        */
+       netdev->min_mtu = ETH_MIN_MTU;
+       netdev->max_mtu = 10236 - VLAN_ETH_HLEN;
 
        port->freeq_refill = 0;
        netif_napi_add(netdev, &port->napi, gmac_napi_poll,