Re: [PATCH] ibmveth: Add function to enable live MAC address changes

2015-02-27 Thread David Miller 
From: Thomas Falcon tlfal...@linux.vnet.ibm.com
Date: Wed, 25 Feb 2015 18:34:24 -0600

 Add a function that will enable changing the MAC address
 of an ibmveth interface while it is still running.
 
 Signed-off-by: Thomas Falcon tlfal...@linux.vnet.ibm.com
 ---
  drivers/net/ethernet/ibm/ibmveth.c | 20 +++-
  1 file changed, 19 insertions(+), 1 deletion(-)
 
 diff --git a/drivers/net/ethernet/ibm/ibmveth.c 
 b/drivers/net/ethernet/ibm/ibmveth.c
 index 21978cc..6e44357 100644
 --- a/drivers/net/ethernet/ibm/ibmveth.c
 +++ b/drivers/net/ethernet/ibm/ibmveth.c
 @@ -1327,6 +1327,24 @@ static unsigned long ibmveth_get_desired_dma(struct 
 vio_dev *vdev)
   return ret;
  }
  
 +static int ibmveth_set_mac_addr(struct net_device *dev, void *p)
 +{
 + struct ibmveth_adapter *adapter = netdev_priv(dev);
 + struct sockaddr *addr = p;
 + u64 mac_address;
 + int rc;
 +
 + if (!is_valid_ether_addr(addr-sa_data))
 + return -EADDRNOTAVAIL;
 +
 + ether_addr_copy(dev-dev_addr, addr-sa_data);
 +
 + mac_address = ibmveth_encode_mac_addr(dev-dev_addr);
 + rc = h_change_logical_lan_mac(adapter-vdev-unit_address, mac_address);

As others have said, if this hypervisor call fails you must not change
dev-dev_addr.  It must always be in sync with the hardware.

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Re: [PATCH] ibmveth: Add function to enable live MAC address changes

2015-02-26 Thread Brian King 
On 02/25/2015 06:34 PM, Thomas Falcon wrote:
 @@ -1327,6 +1327,24 @@ static unsigned long ibmveth_get_desired_dma(struct 
 vio_dev *vdev)
   return ret;
  }
 
 +static int ibmveth_set_mac_addr(struct net_device *dev, void *p)
 +{
 + struct ibmveth_adapter *adapter = netdev_priv(dev);
 + struct sockaddr *addr = p;
 + u64 mac_address;
 + int rc;
 +
 + if (!is_valid_ether_addr(addr-sa_data))
 + return -EADDRNOTAVAIL;
 +
 + ether_addr_copy(dev-dev_addr, addr-sa_data);
 +
 + mac_address = ibmveth_encode_mac_addr(dev-dev_addr);
 + rc = h_change_logical_lan_mac(adapter-vdev-unit_address, mac_address);
 +
 + return rc;

Do you still want to be changing dev-dev_addr if h_change_logical_lan_mac
returns a failure?

-Brian

-- 
Brian King
Power Linux I/O
IBM Linux Technology Center


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Re: [PATCH] ibmveth: Add function to enable live MAC address changes

2015-02-26 Thread Jiri Pirko 
Thu, Feb 26, 2015 at 02:08:06PM CET, brk...@linux.vnet.ibm.com wrote:
On 02/25/2015 06:34 PM, Thomas Falcon wrote:
 @@ -1327,6 +1327,24 @@ static unsigned long ibmveth_get_desired_dma(struct 
 vio_dev *vdev)
  return ret;
  }
 
 +static int ibmveth_set_mac_addr(struct net_device *dev, void *p)
 +{
 +struct ibmveth_adapter *adapter = netdev_priv(dev);
 +struct sockaddr *addr = p;
 +u64 mac_address;
 +int rc;
 +
 +if (!is_valid_ether_addr(addr-sa_data))
 +return -EADDRNOTAVAIL;
 +
 +ether_addr_copy(dev-dev_addr, addr-sa_data);
 +
 +mac_address = ibmveth_encode_mac_addr(dev-dev_addr);
 +rc = h_change_logical_lan_mac(adapter-vdev-unit_address, mac_address);
 +
 +return rc;

Do you still want to be changing dev-dev_addr if h_change_logical_lan_mac
returns a failure?

That should not be done. dev_addr should be in sync with real hw addr.
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[PATCH] ibmveth: Add function to enable live MAC address changes

2015-02-25 Thread Thomas Falcon 
Add a function that will enable changing the MAC address
of an ibmveth interface while it is still running.

Signed-off-by: Thomas Falcon tlfal...@linux.vnet.ibm.com
---
 drivers/net/ethernet/ibm/ibmveth.c | 20 +++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ibm/ibmveth.c 
b/drivers/net/ethernet/ibm/ibmveth.c
index 21978cc..6e44357 100644
--- a/drivers/net/ethernet/ibm/ibmveth.c
+++ b/drivers/net/ethernet/ibm/ibmveth.c
@@ -1327,6 +1327,24 @@ static unsigned long ibmveth_get_desired_dma(struct 
vio_dev *vdev)
return ret;
 }
 
+static int ibmveth_set_mac_addr(struct net_device *dev, void *p)
+{
+   struct ibmveth_adapter *adapter = netdev_priv(dev);
+   struct sockaddr *addr = p;
+   u64 mac_address;
+   int rc;
+
+   if (!is_valid_ether_addr(addr-sa_data))
+   return -EADDRNOTAVAIL;
+
+   ether_addr_copy(dev-dev_addr, addr-sa_data);
+
+   mac_address = ibmveth_encode_mac_addr(dev-dev_addr);
+   rc = h_change_logical_lan_mac(adapter-vdev-unit_address, mac_address);
+
+   return rc;
+}
+
 static const struct net_device_ops ibmveth_netdev_ops = {
.ndo_open   = ibmveth_open,
.ndo_stop   = ibmveth_close,
@@ -1337,7 +1355,7 @@ static const struct net_device_ops ibmveth_netdev_ops = {
.ndo_fix_features   = ibmveth_fix_features,
.ndo_set_features   = ibmveth_set_features,
.ndo_validate_addr  = eth_validate_addr,
-   .ndo_set_mac_address= eth_mac_addr,
+   .ndo_set_mac_address= ibmveth_set_mac_addr,
 #ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller= ibmveth_poll_controller,
 #endif
-- 
1.9.3

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