i40e: quiet complaints when removing default MAC VLAN filter and make set_mac reversible

Older firmware has an incorrect MAC VLAN filter that needs to be replaced
at startup, and now newer firmware doesn't have this problem.  With this
change we no longer complain if the remove fails, and we only add the
new filter if the remove succeeded.

Setting a new LAA worked the first time, but didn't work well in successive
operations, including returning to the HW default address.  This simplifies
the code that was trying to be too smart.

Lastly, this pulls the hardware default mac address out into separate
handling code and keeps the broadcast filtering from getting munged.

Change-ID: I1f54b002def04ffef2546febb9a4044385452f85
Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Tested-by: Jim Young <jamesx.m.young@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_main.c

@@ -1239,8 +1239,11 @@ struct i40e_mac_filter *i40e_put_mac_in_vlan(struct i40e_vsi *vsi, u8 *macaddr,
  * i40e_rm_default_mac_filter - Remove the default MAC filter set by NVM
  * @vsi: the PF Main VSI - inappropriate for any other VSI
  * @macaddr: the MAC address
+ *
+ * Some older firmware configurations set up a default promiscuous VLAN
+ * filter that needs to be removed.
  **/
-static void i40e_rm_default_mac_filter(struct i40e_vsi *vsi, u8 *macaddr)
+static int i40e_rm_default_mac_filter(struct i40e_vsi *vsi, u8 *macaddr)
 {
 	struct i40e_aqc_remove_macvlan_element_data element;
 	struct i40e_pf *pf = vsi->back;
@@ -1248,15 +1251,18 @@ static void i40e_rm_default_mac_filter(struct i40e_vsi *vsi, u8 *macaddr)
 
 	/* Only appropriate for the PF main VSI */
 	if (vsi->type != I40E_VSI_MAIN)
-		return;
+		return -EINVAL;
 
+	memset(&element, 0, sizeof(element));
 	ether_addr_copy(element.mac_addr, macaddr);
 	element.vlan_tag = 0;
 	element.flags = I40E_AQC_MACVLAN_DEL_PERFECT_MATCH |
 			I40E_AQC_MACVLAN_DEL_IGNORE_VLAN;
 	aq_ret = i40e_aq_remove_macvlan(&pf->hw, vsi->seid, &element, 1, NULL);
 	if (aq_ret)
-		dev_err(&pf->pdev->dev, "Could not remove default MAC-VLAN\n");
+		return -ENOENT;
+
+	return 0;
 }
 
 /**
@@ -1385,18 +1391,30 @@ static int i40e_set_mac(struct net_device *netdev, void *p)
 {
 	struct i40e_netdev_priv *np = netdev_priv(netdev);
 	struct i40e_vsi *vsi = np->vsi;
+	struct i40e_pf *pf = vsi->back;
+	struct i40e_hw *hw = &pf->hw;
 	struct sockaddr *addr = p;
 	struct i40e_mac_filter *f;
 
 	if (!is_valid_ether_addr(addr->sa_data))
 		return -EADDRNOTAVAIL;
 
-	netdev_info(netdev, "set mac address=%pM\n", addr->sa_data);
+	if (ether_addr_equal(netdev->dev_addr, addr->sa_data)) {
+		netdev_info(netdev, "already using mac address %pM\n",
+			    addr->sa_data);
+		return 0;
+	}
 
 	if (test_bit(__I40E_DOWN, &vsi->back->state) ||
 	    test_bit(__I40E_RESET_RECOVERY_PENDING, &vsi->back->state))
 		return -EADDRNOTAVAIL;
 
+	if (ether_addr_equal(hw->mac.addr, addr->sa_data))
+		netdev_info(netdev, "returning to hw mac address %pM\n",
+			    hw->mac.addr);
+	else
+		netdev_info(netdev, "set new mac address %pM\n", addr->sa_data);
+
 	if (vsi->type == I40E_VSI_MAIN) {
 		i40e_status ret;
 		ret = i40e_aq_mac_address_write(&vsi->back->hw,
@@ -1410,25 +1428,34 @@ static int i40e_set_mac(struct net_device *netdev, void *p)
 		}
 	}
 
-	f = i40e_find_mac(vsi, addr->sa_data, false, true);
-	if (!f) {
-		/* In order to be sure to not drop any packets, add the
-		 * new address first then delete the old one.
-		 */
-		f = i40e_add_filter(vsi, addr->sa_data, I40E_VLAN_ANY,
-				    false, false);
-		if (!f)
-			return -ENOMEM;
+	if (ether_addr_equal(netdev->dev_addr, hw->mac.addr)) {
+		struct i40e_aqc_remove_macvlan_element_data element;
 
-		i40e_sync_vsi_filters(vsi);
+		memset(&element, 0, sizeof(element));
+		ether_addr_copy(element.mac_addr, netdev->dev_addr);
+		element.flags = I40E_AQC_MACVLAN_DEL_PERFECT_MATCH;
+		i40e_aq_remove_macvlan(&pf->hw, vsi->seid, &element, 1, NULL);
+	} else {
 		i40e_del_filter(vsi, netdev->dev_addr, I40E_VLAN_ANY,
 				false, false);
-		i40e_sync_vsi_filters(vsi);
 	}
 
-	f->is_laa = true;
-	if (!ether_addr_equal(netdev->dev_addr, addr->sa_data))
-		ether_addr_copy(netdev->dev_addr, addr->sa_data);
+	if (ether_addr_equal(addr->sa_data, hw->mac.addr)) {
+		struct i40e_aqc_add_macvlan_element_data element;
+
+		memset(&element, 0, sizeof(element));
+		ether_addr_copy(element.mac_addr, hw->mac.addr);
+		element.flags = cpu_to_le16(I40E_AQC_MACVLAN_ADD_PERFECT_MATCH);
+		i40e_aq_add_macvlan(&pf->hw, vsi->seid, &element, 1, NULL);
+	} else {
+		f = i40e_add_filter(vsi, addr->sa_data, I40E_VLAN_ANY,
+				    false, false);
+		if (f)
+			f->is_laa = true;
+	}
+
+	i40e_sync_vsi_filters(vsi);
+	ether_addr_copy(netdev->dev_addr, addr->sa_data);
 
 	return 0;
 }
@@ -1796,9 +1823,8 @@ int i40e_sync_vsi_filters(struct i40e_vsi *vsi)
 		kfree(add_list);
 		add_list = NULL;
 
-		if (add_happened && (!aq_ret)) {
-			/* do nothing */;
-		} else if (add_happened && (aq_ret)) {
+		if (add_happened && aq_ret &&
+		    pf->hw.aq.asq_last_status != I40E_AQ_RC_EINVAL) {
 			dev_info(&pf->pdev->dev,
 				 "add filter failed, err %d, aq_err %d\n",
 				 aq_ret, pf->hw.aq.asq_last_status);
@@ -7512,14 +7538,14 @@ static int i40e_config_netdev(struct i40e_vsi *vsi)
 	if (vsi->type == I40E_VSI_MAIN) {
 		SET_NETDEV_DEV(netdev, &pf->pdev->dev);
 		ether_addr_copy(mac_addr, hw->mac.perm_addr);
-		/* The following two steps are necessary to prevent reception
-		 * of tagged packets - by default the NVM loads a MAC-VLAN
-		 * filter that will accept any tagged packet.  This is to
-		 * prevent that during normal operations until a specific
-		 * VLAN tag filter has been set.
+		/* The following steps are necessary to prevent reception
+		 * of tagged packets - some older NVM configurations load a
+		 * default a MAC-VLAN filter that accepts any tagged packet
+		 * which must be replaced by a normal filter.
 		 */
-		i40e_rm_default_mac_filter(vsi, mac_addr);
-		i40e_add_filter(vsi, mac_addr, I40E_VLAN_ANY, false, true);
+		if (!i40e_rm_default_mac_filter(vsi, mac_addr))
+			i40e_add_filter(vsi, mac_addr,
+					I40E_VLAN_ANY, false, true);
 	} else {
 		/* relate the VSI_VMDQ name to the VSI_MAIN name */
 		snprintf(netdev->name, IFNAMSIZ, "%sv%%d",
@@ -7735,7 +7761,22 @@ static int i40e_add_vsi(struct i40e_vsi *vsi)
 		f_count++;
 
 		if (f->is_laa && vsi->type == I40E_VSI_MAIN) {
-			i40e_aq_mac_address_write(&vsi->back->hw,
+			struct i40e_aqc_remove_macvlan_element_data element;
+
+			memset(&element, 0, sizeof(element));
+			ether_addr_copy(element.mac_addr, f->macaddr);
+			element.flags = I40E_AQC_MACVLAN_DEL_PERFECT_MATCH;
+			ret = i40e_aq_remove_macvlan(hw, vsi->seid,
+						     &element, 1, NULL);
+			if (ret) {
+				/* some older FW has a different default */
+				element.flags |=
+					       I40E_AQC_MACVLAN_DEL_IGNORE_VLAN;
+				i40e_aq_remove_macvlan(hw, vsi->seid,
+						       &element, 1, NULL);
+			}
+
+			i40e_aq_mac_address_write(hw,
 						  I40E_AQC_WRITE_TYPE_LAA_WOL,
 						  f->macaddr, NULL);
 		}