ibmveth: Fix endian issues with MAC addresses

The code to load a MAC address into a u64 for passing to the
hypervisor via a register is broken on little endian.

Create a helper function called ibmveth_encode_mac_addr
which does the right thing in both big and little endian.

We were storing the MAC address in a long in struct ibmveth_adapter.
It's never used so remove it - we don't need another place in the
driver where we create endian issues with MAC addresses.

Signed-off-by: Anton Blanchard <anton@samba.org>
Cc: stable@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/ibm/ibmveth.c b/drivers/net/ethernet/ibm/ibmveth.c
index 4be9715904616b3f9c1ff2a3bc38d55b58135e58..1fc8334fc181ad6d949ecffa2a289eb899c2a160 100644 (file)
--- a/drivers/net/ethernet/ibm/ibmveth.c
+++ b/drivers/net/ethernet/ibm/ibmveth.c
@@ -522,10 +522,21 @@ retry:
        return rc;
 }
 
+static u64 ibmveth_encode_mac_addr(u8 *mac)
+{
+       int i;
+       u64 encoded = 0;
+
+       for (i = 0; i < ETH_ALEN; i++)
+               encoded = (encoded << 8) | mac[i];
+
+       return encoded;
+}
+
 static int ibmveth_open(struct net_device *netdev)
 {
        struct ibmveth_adapter *adapter = netdev_priv(netdev);
-       u64 mac_address = 0;
+       u64 mac_address;
        int rxq_entries = 1;
        unsigned long lpar_rc;
        int rc;
@@ -579,8 +590,7 @@ static int ibmveth_open(struct net_device *netdev)
        adapter->rx_queue.num_slots = rxq_entries;
        adapter->rx_queue.toggle = 1;
 
-       memcpy(&mac_address, netdev->dev_addr, netdev->addr_len);
-       mac_address = mac_address >> 16;
+       mac_address = ibmveth_encode_mac_addr(netdev->dev_addr);
 
        rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
                                        adapter->rx_queue.queue_len;
@@ -1183,8 +1193,8 @@ static void ibmveth_set_multicast_list(struct net_device *netdev)
                /* add the addresses to the filter table */
                netdev_for_each_mc_addr(ha, netdev) {
                        /* add the multicast address to the filter table */
-                       unsigned long mcast_addr = 0;
-                       memcpy(((char *)&mcast_addr)+2, ha->addr, ETH_ALEN);
+                       u64 mcast_addr;
+                       mcast_addr = ibmveth_encode_mac_addr(ha->addr);
                        lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
                                                   IbmVethMcastAddFilter,
                                                   mcast_addr);
@@ -1372,9 +1382,6 @@ static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
 
        netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
 
-       adapter->mac_addr = 0;
-       memcpy(&adapter->mac_addr, mac_addr_p, ETH_ALEN);
-
        netdev->irq = dev->irq;
        netdev->netdev_ops = &ibmveth_netdev_ops;
        netdev->ethtool_ops = &netdev_ethtool_ops;
@@ -1383,7 +1390,7 @@ static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
                NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
        netdev->features |= netdev->hw_features;
 
-       memcpy(netdev->dev_addr, &adapter->mac_addr, netdev->addr_len);
+       memcpy(netdev->dev_addr, mac_addr_p, ETH_ALEN);
 
        for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
                struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;

diff --git a/drivers/net/ethernet/ibm/ibmveth.h b/drivers/net/ethernet/ibm/ibmveth.h
index 451ba7949e152a66ee87e661e90722496792dfb8..1f37499d43981d260c61cdc1c089d7328a7942c9 100644 (file)
--- a/drivers/net/ethernet/ibm/ibmveth.h
+++ b/drivers/net/ethernet/ibm/ibmveth.h
@@ -138,7 +138,6 @@ struct ibmveth_adapter {
     struct napi_struct napi;
     struct net_device_stats stats;
     unsigned int mcastFilterSize;
-    unsigned long mac_addr;
     void * buffer_list_addr;
     void * filter_list_addr;
     dma_addr_t buffer_list_dma;