Merge branches 'work.misc' and 'work.dcache' of git://git.kernel.org/pub/scm/linux...

[sfrench/cifs-2.6.git] / drivers / net / ethernet / cavium / octeon / octeon_mgmt.c

diff --git a/drivers/net/ethernet/cavium/octeon/octeon_mgmt.c b/drivers/net/ethernet/cavium/octeon/octeon_mgmt.c
index 3f6afb54a5eb188061dcad1ce4679465d408db86..bb43ddb7539e719d0cbff780e5ddf17c756dbe05 100644 (file)
--- a/drivers/net/ethernet/cavium/octeon/octeon_mgmt.c
+++ b/drivers/net/ethernet/cavium/octeon/octeon_mgmt.c
@@ -643,13 +643,21 @@ static int octeon_mgmt_set_mac_address(struct net_device *netdev, void *addr)
 static int octeon_mgmt_change_mtu(struct net_device *netdev, int new_mtu)
 {
        struct octeon_mgmt *p = netdev_priv(netdev);
-       int size_without_fcs = new_mtu + OCTEON_MGMT_RX_HEADROOM;
+       int max_packet = new_mtu + ETH_HLEN + ETH_FCS_LEN;
 
        netdev->mtu = new_mtu;
 
-       cvmx_write_csr(p->agl + AGL_GMX_RX_FRM_MAX, size_without_fcs);
+       /* HW lifts the limit if the frame is VLAN tagged
+        * (+4 bytes per each tag, up to two tags)
+        */
+       cvmx_write_csr(p->agl + AGL_GMX_RX_FRM_MAX, max_packet);
+       /* Set the hardware to truncate packets larger than the MTU. The jabber
+        * register must be set to a multiple of 8 bytes, so round up. JABBER is
+        * an unconditional limit, so we need to account for two possible VLAN
+        * tags.
+        */
        cvmx_write_csr(p->agl + AGL_GMX_RX_JABBER,
-                      (size_without_fcs + 7) & 0xfff8);
+                      (max_packet + 7 + VLAN_HLEN * 2) & 0xfff8);
 
        return 0;
 }