netdev - Re: [PATCH net] ibmveth: Convert multicast list size for little-endian systems

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Date:   Mon, 12 Aug 2019 10:49:40 -0700
From:   Joe Perches <joe@...ches.com>
To:     Thomas Falcon <tlfalcon@...ux.ibm.com>, netdev@...r.kernel.org
Cc:     liuhangbin@...il.com, davem@...emloft.net
Subject: Re: [PATCH net] ibmveth: Convert multicast list size for
 little-endian systems

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 <liuhangbin@...il.com>
> Signed-off-by: Thomas Falcon <tlfalcon@...ux.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)
---
 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);