netdev - Re: [PATCH] i40e: handle setting administratively set MAC address back to zero

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Date:   Sun, 25 Jun 2017 13:10:53 +0200
From:   Stefan Assmann <sassmann@...nic.de>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        davem@...emloft.net, jeffrey.t.kirsher@...el.com
Subject: Re: [PATCH] i40e: handle setting administratively set MAC address
 back to zero

On 25.06.2017 08:21, Leon Romanovsky wrote:
> On Fri, Jun 23, 2017 at 09:46:24AM +0200, Stefan Assmann wrote:
>> When an administratively set MAC was previously set and should now be
>> switched back to 00:00:00:00:00:00 the pf_set_mac flag did not get
>> toggled back to false.
>> As a result VFs were still treated as if an administratively set MAC was
>> present.
>>
>> Signed-off-by: Stefan Assmann <sassmann@...nic.de>
>> ---
>>  drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 12 ++++++++++--
>>  1 file changed, 10 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
>> index ecbe40e..af0ff61 100644
>> --- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
>> +++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
>> @@ -2764,7 +2764,6 @@ int i40e_ndo_set_vf_mac(struct net_device *netdev, int vf_id, u8 *mac)
>>
>>  	spin_unlock_bh(&vsi->mac_filter_hash_lock);
>>
>> -	dev_info(&pf->pdev->dev, "Setting MAC %pM on VF %d\n", mac, vf_id);
>>  	/* program mac filter */
>>  	if (i40e_sync_vsi_filters(vsi)) {
>>  		dev_err(&pf->pdev->dev, "Unable to program ucast filters\n");
>> @@ -2772,7 +2771,16 @@ int i40e_ndo_set_vf_mac(struct net_device *netdev, int vf_id, u8 *mac)
>>  		goto error_param;
>>  	}
>>  	ether_addr_copy(vf->default_lan_addr.addr, mac);
>> -	vf->pf_set_mac = true;
>> +
>> +	if (is_zero_ether_addr(mac)) {
>> +		vf->pf_set_mac = false;
>> +		dev_info(&pf->pdev->dev, "Removing MAC on VF %d\n", vf_id);
>> +	} else {
>> +		vf->pf_set_mac = true;
>> +		dev_info(&pf->pdev->dev, "Setting MAC %pM on VF %d\n",
>> +			 mac, vf_id);
>> +	}
>> +
> 
> It can be removed to be one line change, because I'm not sure that
> dev_info prints are necessary here.
> +	vf->pf_set_mac = is_zero_ether_addr(mac);
> 
> Thanks

This matches ixgbe behavior, so I'd prefer to keep it this way.
Thanks!

  Stefan