linux-kernel - [PATCH 4.4 007/192] [PATCH 007/135] i40e: dont add zero MAC filter

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Date:   Mon, 12 Sep 2016 18:58:36 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Mitch Williams <mitch.a.williams@...el.com>,
        Andrew Bowers <andrewx.bowers@...el.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.4 007/192] [PATCH 007/135] i40e: dont add zero MAC filter

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit b7b713a8eaf325607d37229f024ad0b9f3e7f320 ]

When VFs are created, the MAC address defaults to all zeros, indicating
to the VF driver that it should use a random MAC address. However, the
PF driver was incorrectly adding this zero MAC to the filter table,
along with the VF's randomly generated MAC address.

Check for a good address before adding the default filter. While we're
at it, make the error message a bit more useful.

Change-ID: Ia100947d68140e0f73a19ba755cbffc3e79a8fcf
Signed-off-by: Mitch Williams <mitch.a.williams@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c |   15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -549,12 +549,15 @@ static int i40e_alloc_vsi_res(struct i40
 			i40e_vsi_add_pvid(vsi, vf->port_vlan_id);
 
 		spin_lock_bh(&vsi->mac_filter_list_lock);
-		f = i40e_add_filter(vsi, vf->default_lan_addr.addr,
-				    vf->port_vlan_id ? vf->port_vlan_id : -1,
-				    true, false);
-		if (!f)
-			dev_info(&pf->pdev->dev,
-				 "Could not allocate VF MAC addr\n");
+		if (is_valid_ether_addr(vf->default_lan_addr.addr)) {
+			f = i40e_add_filter(vsi, vf->default_lan_addr.addr,
+				       vf->port_vlan_id ? vf->port_vlan_id : -1,
+				       true, false);
+			if (!f)
+				dev_info(&pf->pdev->dev,
+					 "Could not add MAC filter %pM for VF %d\n",
+					vf->default_lan_addr.addr, vf->vf_id);
+		}
 		f = i40e_add_filter(vsi, brdcast,
 				    vf->port_vlan_id ? vf->port_vlan_id : -1,
 				    true, false);