ibmveth: Convert multicast list size for little-endian system

[ Upstream commit 66cf4710b23ab2adda11155684a2c8826f4fe732 ]

The ibm,mac-address-filters property defines the maximum number of
addresses the hypervisor's multicast filter list can support. It is
encoded as a big-endian integer in the OF device tree, but the virtual
ethernet driver does not convert it for use by little-endian systems.
As a result, the driver is not behaving as it should on affected systems
when a large number of multicast addresses are assigned to the device.

Reported-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: Thomas Falcon <tlfalcon@linux.ibm.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/ibm/ibmveth.c b/drivers/net/ethernet/ibm/ibmveth.c
index 955f658..de9897c 100644 (file)
--- a/drivers/net/ethernet/ibm/ibmveth.c
+++ b/drivers/net/ethernet/ibm/ibmveth.c
@@ -1557,7 +1557,7 @@ static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
        struct net_device *netdev;
        struct ibmveth_adapter *adapter;
        unsigned char *mac_addr_p;
-       unsigned int *mcastFilterSize_p;
+       __be32 *mcastFilterSize_p;
        long ret;
        unsigned long ret_attr;
 
@@ -1579,8 +1579,9 @@ static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
                return -EINVAL;
        }
 
-       mcastFilterSize_p = (unsigned int *)vio_get_attribute(dev,
-                                               VETH_MCAST_FILTER_SIZE, NULL);
+       mcastFilterSize_p = (__be32 *)vio_get_attribute(dev,
+                                                       VETH_MCAST_FILTER_SIZE,
+                                                       NULL);
        if (!mcastFilterSize_p) {
                dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
                        "attribute\n");
@@ -1597,7 +1598,7 @@ static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
 
        adapter->vdev = dev;
        adapter->netdev = netdev;
-       adapter->mcastFilterSize = *mcastFilterSize_p;
+       adapter->mcastFilterSize = be32_to_cpu(*mcastFilterSize_p);
        adapter->pool_config = 0;
 
        netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);