atl1c: adjust max mtu according to Mikrotik 10/25G NIC ability

The new Mikrotik 10/25G NIC supports jumbo frames. Jumbo frames are
supported for TSO as well.

This enables the support for mtu up to 9500 bytes.

Signed-off-by: Gatis Peisenieks <gatis@mikrotik.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
index 08a0f49..dbafd81 100644 (file)
--- a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
+++ b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
@@ -478,6 +478,9 @@ static void atl1c_set_rxbufsize(struct atl1c_adapter *adapter,
 static netdev_features_t atl1c_fix_features(struct net_device *netdev,
        netdev_features_t features)
 {
+       struct atl1c_adapter *adapter = netdev_priv(netdev);
+       struct atl1c_hw *hw = &adapter->hw;
+
        /*
         * Since there is no support for separate rx/tx vlan accel
         * enable/disable make sure tx flag is always in same state as rx.
@@ -487,8 +490,10 @@ static netdev_features_t atl1c_fix_features(struct net_device *netdev,
        else
                features &= ~NETIF_F_HW_VLAN_CTAG_TX;
 
-       if (netdev->mtu > MAX_TSO_FRAME_SIZE)
-               features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
+       if (hw->nic_type != athr_mt) {
+               if (netdev->mtu > MAX_TSO_FRAME_SIZE)
+                       features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
+       }
 
        return features;
 }
@@ -515,9 +520,12 @@ static void atl1c_set_max_mtu(struct net_device *netdev)
        case athr_l1d:
        case athr_l1d_2:
                netdev->max_mtu = MAX_JUMBO_FRAME_SIZE -
-                                 (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);
+                       (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);
+               break;
+       case athr_mt:
+               netdev->max_mtu = 9500;
                break;
-       /* The 10/100 devices don't support jumbo packets, max_mtu 1500 */
+               /* The 10/100 devices don't support jumbo packets, max_mtu 1500 */
        default:
                netdev->max_mtu = ETH_DATA_LEN;
                break;