e1000e: flow control thresholds not correct when changing mtu

When changing MTU, save it off prior to resetting otherwise the flow control
thresholds may be miscalculated.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index 6345827..fad8f9e 100644 (file)
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -4305,8 +4305,10 @@ static int e1000_change_mtu(struct net_device *netdev, int new_mtu)
 
        while (test_and_set_bit(__E1000_RESETTING, &adapter->state))
                msleep(1);
-       /* e1000e_down has a dependency on max_frame_size */
+       /* e1000e_down -> e1000e_reset dependent on max_frame_size & mtu */
        adapter->max_frame_size = max_frame;
+       e_info("changing MTU from %d to %d\n", netdev->mtu, new_mtu);
+       netdev->mtu = new_mtu;
        if (netif_running(netdev))
                e1000e_down(adapter);
 
@@ -4336,9 +4338,6 @@ static int e1000_change_mtu(struct net_device *netdev, int new_mtu)
                adapter->rx_buffer_len = ETH_FRAME_LEN + VLAN_HLEN
                                         + ETH_FCS_LEN;
 
-       e_info("changing MTU from %d to %d\n", netdev->mtu, new_mtu);
-       netdev->mtu = new_mtu;
-
        if (netif_running(netdev))
                e1000e_up(adapter);
        else