On 8/12/19 12:49 PM, Joe Perches wrote:
On Mon, 2019-08-12 at 12:43 -0500, Thomas Falcon wrote:
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 <liuhang...@gmail.com>
Signed-off-by: Thomas Falcon <tlfal...@linux.ibm.com>
---
  drivers/net/ethernet/ibm/ibmveth.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ibm/ibmveth.c 
b/drivers/net/ethernet/ibm/ibmveth.c
index d654c23..b50a6cf 100644
--- a/drivers/net/ethernet/ibm/ibmveth.c
+++ b/drivers/net/ethernet/ibm/ibmveth.c
@@ -1645,7 +1645,7 @@ 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);
Perhaps to keep sparse happy too: (untested)


Thanks! I will test this and submit a v2 soon.


---
  drivers/net/ethernet/ibm/ibmveth.c | 6 +++---
  1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmveth.c 
b/drivers/net/ethernet/ibm/ibmveth.c
index d654c234aaf7..90539d7ce565 100644
--- a/drivers/net/ethernet/ibm/ibmveth.c
+++ b/drivers/net/ethernet/ibm/ibmveth.c
@@ -1605,7 +1605,7 @@ 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;
@@ -1627,7 +1627,7 @@ static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
                return -EINVAL;
        }
- mcastFilterSize_p = (unsigned int *)vio_get_attribute(dev,
+       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 "
@@ -1645,7 +1645,7 @@ 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);



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