netdev - Re: [PATCH net] ibmvnic: Fix pending MAC address changes

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Date:   Mon, 15 Jan 2018 08:58:07 -0600
From:   John Allen <jallen@...ux.vnet.ibm.com>
To:     Thomas Falcon <tlfalcon@...ux.vnet.ibm.com>, netdev@...r.kernel.org
Cc:     nfont@...ux.vnet.ibm.com
Subject: Re: [PATCH net] ibmvnic: Fix pending MAC address changes

On 01/10/2018 07:39 PM, Thomas Falcon wrote:
> Due to architecture limitations, the IBM VNIC client driver is unable
> to perform MAC address changes unless the device has "logged in" to
> its backing device. Currently, pending MAC changes are handled before
> login, resulting in an error and failure to change the MAC address.
> Moving that chunk to the end of the ibmvnic_login function, when we are
> sure that it was successful, fixes that.
> 
> The MAC address can be changed when the device is up or down, so
> only check if the device is in a "PROBED" state before setting the
> MAC address.
> 
> Fixes: c26eba03e407 ("ibmvnic: Update reset infrastructure to support tunable parameters")
> Signed-off-by: Thomas Falcon <tlfalcon@...ux.vnet.ibm.com>
> ---

Reviewed-by: John Allen <jallen@...ux.vnet.ibm.com>

>  drivers/net/ethernet/ibm/ibmvnic.c | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
> index 6911b7c..b676fa9 100644
> --- a/drivers/net/ethernet/ibm/ibmvnic.c
> +++ b/drivers/net/ethernet/ibm/ibmvnic.c
> @@ -757,6 +757,12 @@ static int ibmvnic_login(struct net_device *netdev)
>  		}
>  	} while (adapter->renegotiate);
> 
> +	/* handle pending MAC address changes after successful login */
> +	if (adapter->mac_change_pending) {
> +		__ibmvnic_set_mac(netdev, &adapter->desired.mac);
> +		adapter->mac_change_pending = false;
> +	}
> +
>  	return 0;
>  }
> 
> @@ -994,11 +1000,6 @@ static int ibmvnic_open(struct net_device *netdev)
> 
>  	mutex_lock(&adapter->reset_lock);
> 
> -	if (adapter->mac_change_pending) {
> -		__ibmvnic_set_mac(netdev, &adapter->desired.mac);
> -		adapter->mac_change_pending = false;
> -	}
> -
>  	if (adapter->state != VNIC_CLOSED) {
>  		rc = ibmvnic_login(netdev);
>  		if (rc) {
> @@ -1532,7 +1533,7 @@ static int ibmvnic_set_mac(struct net_device *netdev, void *p)
>  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
>  	struct sockaddr *addr = p;
> 
> -	if (adapter->state != VNIC_OPEN) {
> +	if (adapter->state == VNIC_PROBED) {
>  		memcpy(&adapter->desired.mac, addr, sizeof(struct sockaddr));
>  		adapter->mac_change_pending = true;
>  		return 0;
>