i40e: make use of __dev_uc_sync and __dev_mc_sync

The kernel provides __dev_uc_sync and __dev_mc_sync in order for drivers
which need individual notification of add and delete for each filter.
These functions allow us to vastly simplify our .set_rx_mode handler. We
need to implement two functions for sync and unsync which add and remove
filters respectively.

This change avoids a very complex and inefficient algorithm which
resulted in an abnormal latency for the .set_rx_mode NDO operation. The
resulting code after this change is more readable, more efficient, and
less code.

Due to the callback signature used by these functions we also must
update several other functions to take a const u8 * pointer.

Change-Id: I2ca7fd4e10c0c07ed2291db1ea41bf5987fc6474
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e.h

@@ -720,8 +720,8 @@ u32 i40e_get_global_fd_count(struct i40e_pf *pf);
 bool i40e_set_ntuple(struct i40e_pf *pf, netdev_features_t features);
 void i40e_set_ethtool_ops(struct net_device *netdev);
 struct i40e_mac_filter *i40e_add_filter(struct i40e_vsi *vsi,
-					u8 *macaddr, s16 vlan);
-void i40e_del_filter(struct i40e_vsi *vsi, u8 *macaddr, s16 vlan);
+					const u8 *macaddr, s16 vlan);
+void i40e_del_filter(struct i40e_vsi *vsi, const u8 *macaddr, s16 vlan);
 int i40e_sync_vsi_filters(struct i40e_vsi *vsi);
 struct i40e_vsi *i40e_vsi_setup(struct i40e_pf *pf, u8 type,
 				u16 uplink, u32 param1);
@@ -813,10 +813,10 @@ void i40e_vlan_stripping_disable(struct i40e_vsi *vsi);
 int i40e_vsi_add_vlan(struct i40e_vsi *vsi, s16 vid);
 int i40e_vsi_kill_vlan(struct i40e_vsi *vsi, s16 vid);
 struct i40e_mac_filter *i40e_put_mac_in_vlan(struct i40e_vsi *vsi,
-					     u8 *macaddr);
-int i40e_del_mac_all_vlan(struct i40e_vsi *vsi, u8 *macaddr);
+					     const u8 *macaddr);
+int i40e_del_mac_all_vlan(struct i40e_vsi *vsi, const u8 *macaddr);
 bool i40e_is_vsi_in_vlan(struct i40e_vsi *vsi);
-struct i40e_mac_filter *i40e_find_mac(struct i40e_vsi *vsi, u8 *macaddr);
+struct i40e_mac_filter *i40e_find_mac(struct i40e_vsi *vsi, const u8 *macaddr);
 #ifdef I40E_FCOE
 int __i40e_setup_tc(struct net_device *netdev, u32 handle, __be16 proto,
 		    struct tc_to_netdev *tc);

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

@@ -1149,7 +1149,7 @@ void i40e_update_stats(struct i40e_vsi *vsi)
  * Returns ptr to the filter object or NULL
  **/
 static struct i40e_mac_filter *i40e_find_filter(struct i40e_vsi *vsi,
-						u8 *macaddr, s16 vlan)
+						const u8 *macaddr, s16 vlan)
 {
 	struct i40e_mac_filter *f;
 
@@ -1172,7 +1172,7 @@ static struct i40e_mac_filter *i40e_find_filter(struct i40e_vsi *vsi,
  * Returns the first filter with the provided MAC address or NULL if
  * MAC address was not found
  **/
-struct i40e_mac_filter *i40e_find_mac(struct i40e_vsi *vsi, u8 *macaddr)
+struct i40e_mac_filter *i40e_find_mac(struct i40e_vsi *vsi, const u8 *macaddr)
 {
 	struct i40e_mac_filter *f;
 
@@ -1217,7 +1217,8 @@ bool i40e_is_vsi_in_vlan(struct i40e_vsi *vsi)
  *
  * Returns first filter found on success, else NULL
  **/
-struct i40e_mac_filter *i40e_put_mac_in_vlan(struct i40e_vsi *vsi, u8 *macaddr)
+struct i40e_mac_filter *i40e_put_mac_in_vlan(struct i40e_vsi *vsi,
+					     const u8 *macaddr)
 {
 	struct i40e_mac_filter *f;
 
@@ -1243,7 +1244,7 @@ struct i40e_mac_filter *i40e_put_mac_in_vlan(struct i40e_vsi *vsi, u8 *macaddr)
  *
  * Returns 0 for success, or error
  **/
-int i40e_del_mac_all_vlan(struct i40e_vsi *vsi, u8 *macaddr)
+int i40e_del_mac_all_vlan(struct i40e_vsi *vsi, const u8 *macaddr)
 {
 	struct i40e_mac_filter *f = NULL;
 	int changed = 0;
@@ -1275,7 +1276,7 @@ int i40e_del_mac_all_vlan(struct i40e_vsi *vsi, u8 *macaddr)
  * being held.
  **/
 struct i40e_mac_filter *i40e_add_filter(struct i40e_vsi *vsi,
-					u8 *macaddr, s16 vlan)
+					const u8 *macaddr, s16 vlan)
 {
 	struct i40e_mac_filter *f;
 
@@ -1338,7 +1339,7 @@ struct i40e_mac_filter *i40e_add_filter(struct i40e_vsi *vsi,
  * the "safe" variants of any list iterators, e.g. list_for_each_entry_safe()
  * instead of list_for_each_entry().
  **/
-void i40e_del_filter(struct i40e_vsi *vsi, u8 *macaddr, s16 vlan)
+void i40e_del_filter(struct i40e_vsi *vsi, const u8 *macaddr, s16 vlan)
 {
 	struct i40e_mac_filter *f;
 
@@ -1567,6 +1568,52 @@ static void i40e_vsi_setup_queue_map(struct i40e_vsi *vsi,
 	ctxt->info.valid_sections |= cpu_to_le16(sections);
 }
 
+/**
+ * i40e_addr_sync - Callback for dev_(mc|uc)_sync to add address
+ * @netdev: the netdevice
+ * @addr: address to add
+ *
+ * Called by __dev_(mc|uc)_sync when an address needs to be added. We call
+ * __dev_(uc|mc)_sync from .set_rx_mode and guarantee to hold the hash lock.
+ */
+static int i40e_addr_sync(struct net_device *netdev, const u8 *addr)
+{
+	struct i40e_netdev_priv *np = netdev_priv(netdev);
+	struct i40e_vsi *vsi = np->vsi;
+	struct i40e_mac_filter *f;
+
+	if (i40e_is_vsi_in_vlan(vsi))
+		f = i40e_put_mac_in_vlan(vsi, addr);
+	else
+		f = i40e_add_filter(vsi, addr, I40E_VLAN_ANY);
+
+	if (f)
+		return 0;
+	else
+		return -ENOMEM;
+}
+
+/**
+ * i40e_addr_unsync - Callback for dev_(mc|uc)_sync to remove address
+ * @netdev: the netdevice
+ * @addr: address to add
+ *
+ * Called by __dev_(mc|uc)_sync when an address needs to be removed. We call
+ * __dev_(uc|mc)_sync from .set_rx_mode and guarantee to hold the hash lock.
+ */
+static int i40e_addr_unsync(struct net_device *netdev, const u8 *addr)
+{
+	struct i40e_netdev_priv *np = netdev_priv(netdev);
+	struct i40e_vsi *vsi = np->vsi;
+
+	if (i40e_is_vsi_in_vlan(vsi))
+		i40e_del_mac_all_vlan(vsi, addr);
+	else
+		i40e_del_filter(vsi, addr, I40E_VLAN_ANY);
+
+	return 0;
+}
+
 /**
  * i40e_set_rx_mode - NDO callback to set the netdev filters
  * @netdev: network interface device structure
@@ -1578,54 +1625,13 @@ static void i40e_set_rx_mode(struct net_device *netdev)
 #endif
 {
 	struct i40e_netdev_priv *np = netdev_priv(netdev);
-	struct i40e_mac_filter *f, *ftmp;
 	struct i40e_vsi *vsi = np->vsi;
-	struct netdev_hw_addr *uca;
-	struct netdev_hw_addr *mca;
-	struct netdev_hw_addr *ha;
 
 	spin_lock_bh(&vsi->mac_filter_list_lock);
 
-	/* add addr if not already in the filter list */
-	netdev_for_each_uc_addr(uca, netdev) {
-		if (!i40e_find_mac(vsi, uca->addr)) {
-			if (i40e_is_vsi_in_vlan(vsi))
-				i40e_put_mac_in_vlan(vsi, uca->addr);
-			else
-				i40e_add_filter(vsi, uca->addr, I40E_VLAN_ANY);
-		}
-	}
-
-	netdev_for_each_mc_addr(mca, netdev) {
-		if (!i40e_find_mac(vsi, mca->addr)) {
-			if (i40e_is_vsi_in_vlan(vsi))
-				i40e_put_mac_in_vlan(vsi, mca->addr);
-			else
-				i40e_add_filter(vsi, mca->addr, I40E_VLAN_ANY);
-		}
-	}
+	__dev_uc_sync(netdev, i40e_addr_sync, i40e_addr_unsync);
+	__dev_mc_sync(netdev, i40e_addr_sync, i40e_addr_unsync);
 
-	/* remove filter if not in netdev list */
-	list_for_each_entry_safe(f, ftmp, &vsi->mac_filter_list, list) {
-
-		netdev_for_each_mc_addr(mca, netdev)
-			if (ether_addr_equal(mca->addr, f->macaddr))
-				goto bottom_of_search_loop;
-
-		netdev_for_each_uc_addr(uca, netdev)
-			if (ether_addr_equal(uca->addr, f->macaddr))
-				goto bottom_of_search_loop;
-
-		for_each_dev_addr(netdev, ha)
-			if (ether_addr_equal(ha->addr, f->macaddr))
-				goto bottom_of_search_loop;
-
-		/* f->macaddr wasn't found in uc, mc, or ha list so delete it */
-		i40e_del_filter(vsi, f->macaddr, I40E_VLAN_ANY);
-
-bottom_of_search_loop:
-		continue;
-	}
 	spin_unlock_bh(&vsi->mac_filter_list_lock);
 
 	/* check for other flag changes */
@@ -9434,8 +9440,17 @@ int i40e_vsi_release(struct i40e_vsi *vsi)
 	}
 
 	spin_lock_bh(&vsi->mac_filter_list_lock);
+
+	/* clear the sync flag on all filters */
+	if (vsi->netdev) {
+		__dev_uc_unsync(vsi->netdev, NULL);
+		__dev_mc_unsync(vsi->netdev, NULL);
+	}
+
+	/* make sure any remaining filters are marked for deletion */
 	list_for_each_entry_safe(f, ftmp, &vsi->mac_filter_list, list)
 		i40e_del_filter(vsi, f->macaddr, f->vlan);
+
 	spin_unlock_bh(&vsi->mac_filter_list_lock);
 
 	i40e_sync_vsi_filters(vsi);