sh_eth: add support for changing MTU

The hardware supports the MTU to be changed and the driver it self is
somewhat prepared to support this. This patch hooks up the callbacks to
be able to change the MTU from user-space.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Acked-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index 2d686ccf971b1b6525d7ded8ec5e43b65b67ee6c..48b66df88294a4f26027bbead5c1b6418e4b0b45 100644 (file)
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -2558,6 +2558,17 @@ static int sh_eth_do_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
        return phy_mii_ioctl(phydev, rq, cmd);
 }
 
+static int sh_eth_change_mtu(struct net_device *ndev, int new_mtu)
+{
+       if (netif_running(ndev))
+               return -EBUSY;
+
+       ndev->mtu = new_mtu;
+       netdev_update_features(ndev);
+
+       return 0;
+}
+
 /* For TSU_POSTn. Please refer to the manual about this (strange) bitfields */
 static void *sh_eth_tsu_get_post_reg_offset(struct sh_eth_private *mdp,
                                            int entry)
@@ -3029,6 +3040,7 @@ static const struct net_device_ops sh_eth_netdev_ops = {
        .ndo_set_rx_mode        = sh_eth_set_rx_mode,
        .ndo_tx_timeout         = sh_eth_tx_timeout,
        .ndo_do_ioctl           = sh_eth_do_ioctl,
+       .ndo_change_mtu         = sh_eth_change_mtu,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_set_mac_address    = eth_mac_addr,
 };
@@ -3043,6 +3055,7 @@ static const struct net_device_ops sh_eth_netdev_ops_tsu = {
        .ndo_vlan_rx_kill_vid   = sh_eth_vlan_rx_kill_vid,
        .ndo_tx_timeout         = sh_eth_tx_timeout,
        .ndo_do_ioctl           = sh_eth_do_ioctl,
+       .ndo_change_mtu         = sh_eth_change_mtu,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_set_mac_address    = eth_mac_addr,
 };
@@ -3171,6 +3184,13 @@ static int sh_eth_drv_probe(struct platform_device *pdev)
        }
        sh_eth_set_default_cpu_data(mdp->cd);
 
+       /* User's manual states max MTU should be 2048 but due to the
+        * alignment calculations in sh_eth_ring_init() the practical
+        * MTU is a bit less. Maybe this can be optimized some more.
+        */
+       ndev->max_mtu = 2000 - (ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN);
+       ndev->min_mtu = ETH_MIN_MTU;
+
        /* set function */
        if (mdp->cd->tsu)
                ndev->netdev_ops = &sh_eth_netdev_ops_tsu;