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ixgbe: cleanup logic in ixgbe_change_mtu

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This change is meant to just cleanup the logic in ixgbe_change_mtu since we
are making it unnecessarily complex due to a workaround required for 82599
when SR-IOV is enabled.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Stephen Ko <stephen.s.ko@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Alexander Duyck 2012-02-08 07:50:35 +00:00 committed by Jeff Kirsher
parent f800326dca
commit 655309e944
1 changed files with 12 additions and 8 deletions
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20
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
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@ -5544,20 +5544,24 @@ static void ixgbe_free_all_rx_resources(struct ixgbe_adapter *adapter)
static int ixgbe_change_mtu(struct net_device *netdev, int new_mtu)
{
struct ixgbe_adapter *adapter = netdev_priv(netdev);
struct ixgbe_hw *hw = &adapter->hw;
int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;
/* MTU < 68 is an error and causes problems on some kernels */
if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED &&
hw->mac.type != ixgbe_mac_X540) {
if ((new_mtu < 68) || (max_frame > MAXIMUM_ETHERNET_VLAN_SIZE))
if ((new_mtu < 68) || (max_frame > IXGBE_MAX_JUMBO_FRAME_SIZE))
return -EINVAL;
/*
* For 82599EB we cannot allow PF to change MTU greater than 1500
* in SR-IOV mode as it may cause buffer overruns in guest VFs that
* don't allocate and chain buffers correctly.
*/
if ((adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) &&
(adapter->hw.mac.type == ixgbe_mac_82599EB) &&
(max_frame > MAXIMUM_ETHERNET_VLAN_SIZE))
return -EINVAL;
} else {
if ((new_mtu < 68) || (max_frame > IXGBE_MAX_JUMBO_FRAME_SIZE))
return -EINVAL;
}
e_info(probe, "changing MTU from %d to %d\n", netdev->mtu, new_mtu);
/* must set new MTU before calling down or up */
netdev->mtu = new_mtu;