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

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Date:   Sun, 25 Jun 2017 09:21:08 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Stefan Assmann <sassmann@...nic.de>
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 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

>  	/* Force the VF driver stop so it has to reload with new MAC address */
>  	i40e_vc_disable_vf(pf, vf);
>  	dev_info(&pf->pdev->dev, "Reload the VF driver to make this change effective.\n");
> --
> 2.9.4
>

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