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sunvnet: allow admin to set sunvnet MTU

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This patch allows an admin to set the MTU on a sunvnet device to arbitrary
values between the minimum (68) and maximum (65535) IPv4 packet sizes.

Signed-off-by: David L Stevens <david.stevens@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David L Stevens
2014-09-29 19:48:18 -04:00
committed by David S. Miller
parent 8e845f4cbb
commit 42db672dca
3 changed files with 10 additions and 5 deletions
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7
drivers/net/ethernet/sun/sunvnet.c
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@@ -913,6 +913,9 @@ static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
if (unlikely(!skb))
goto out_dropped;
if (skb->len > port->rmtu)
goto out_dropped;
spin_lock_irqsave(&port->vio.lock, flags);
dr = &port->vio.drings[VIO_DRIVER_TX_RING];
@@ -944,7 +947,7 @@ static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
skb = NULL;
err = ldc_map_single(port->vio.lp, start, nlen,
port->tx_bufs[txi].cookies, 2,
port->tx_bufs[txi].cookies, VNET_MAXCOOKIES,
(LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW));
if (err < 0) {
netdev_info(dev, "tx buffer map error %d\n", err);
@@ -1182,7 +1185,7 @@ static void vnet_set_rx_mode(struct net_device *dev)
static int vnet_change_mtu(struct net_device *dev, int new_mtu)
{
if (new_mtu != ETH_DATA_LEN)
if (new_mtu < 68 || new_mtu > 65535)
return -EINVAL;
dev->mtu = new_mtu;