[PATCH AUTOSEL 4.4 04/15] ibmveth: Convert multicast list size for little-endian system

Sasha Levin
2019-08-29T18:19:09Z

From: Thomas Falcon <tlfalcon@linux.ibm.com>

[ 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>
---
drivers/net/ethernet/ibm/ibmveth.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmveth.c b/drivers/net/ethernet/ibm/ibmveth.c
index 70b3253e7ed5e..b46fc37c1a947 100644
--- a/drivers/net/ethernet/ibm/ibmveth.c
+++ b/drivers/net/ethernet/ibm/ibmveth.c
@@ -1555,7 +1555,7 @@ 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;

@@ -1577,8 +1577,9 @@ 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");
@@ -1595,7 +1596,7 @@ 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);
--
2.20.1