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-rw-r--r--drivers/net/ethernet/cadence/macb.c24
1 files changed, 23 insertions, 1 deletions
diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index cb84587d7555..97c664611e84 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -54,6 +54,8 @@
#define MACB_MAX_TX_LEN ((unsigned int)((1 << MACB_TX_FRMLEN_SIZE) - 1))
#define GEM_MAX_TX_LEN ((unsigned int)((1 << GEM_TX_FRMLEN_SIZE) - 1))
+#define GEM_MTU_MIN_SIZE 68
+
/*
* Graceful stop timeouts in us. We should allow up to
* 1 frame time (10 Mbits/s, full-duplex, ignoring collisions)
@@ -1855,6 +1857,26 @@ static int macb_close(struct net_device *dev)
return 0;
}
+static int macb_change_mtu(struct net_device *dev, int new_mtu)
+{
+ struct macb *bp = netdev_priv(dev);
+ u32 max_mtu;
+
+ if (netif_running(dev))
+ return -EBUSY;
+
+ max_mtu = ETH_DATA_LEN;
+ if (bp->caps | MACB_CAPS_JUMBO)
+ max_mtu = gem_readl(bp, JML) - ETH_HLEN - ETH_FCS_LEN;
+
+ if ((new_mtu > max_mtu) || (new_mtu < GEM_MTU_MIN_SIZE))
+ return -EINVAL;
+
+ dev->mtu = new_mtu;
+
+ return 0;
+}
+
static void gem_update_stats(struct macb *bp)
{
int i;
@@ -2131,7 +2153,7 @@ static const struct net_device_ops macb_netdev_ops = {
.ndo_get_stats = macb_get_stats,
.ndo_do_ioctl = macb_ioctl,
.ndo_validate_addr = eth_validate_addr,
- .ndo_change_mtu = eth_change_mtu,
+ .ndo_change_mtu = macb_change_mtu,
.ndo_set_mac_address = eth_mac_addr,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = macb_poll_controller,