Merge branch 'optimize-procedure-of-changing-mac-address-on-interface'

Piotr Gardocki says:

====================
optimize procedure of changing MAC address on interface

The first patch adds an if statement in core to skip early when
the MAC address is not being changes.
The remaining patches remove such checks from Intel drivers
as they're redundant at this point.
====================

Link: https://lore.kernel.org/r/20230614145302.902301-1-piotrx.gardocki@intel.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -1788,12 +1788,6 @@ static int i40e_set_mac(struct net_device *netdev, void *p)
 	if (!is_valid_ether_addr(addr->sa_data))
 		return -EADDRNOTAVAIL;
 
-	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, pf->state) ||
 	    test_bit(__I40E_RESET_RECOVERY_PENDING, pf->state))
 		return -EADDRNOTAVAIL;

drivers/net/ethernet/intel/ice/ice_main.c

@@ -5624,11 +5624,6 @@ static int ice_set_mac_address(struct net_device *netdev, void *pi)
 	if (!is_valid_ether_addr(mac))
 		return -EADDRNOTAVAIL;
 
-	if (ether_addr_equal(netdev->dev_addr, mac)) {
-		netdev_dbg(netdev, "already using mac %pM\n", mac);
-		return 0;
-	}
-
 	if (test_bit(ICE_DOWN, pf->state) ||
 	    ice_is_reset_in_progress(pf->state)) {
 		netdev_err(netdev, "can't set mac %pM. device not ready\n",

net/core/dev.c

@@ -8781,6 +8781,8 @@ int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa,
 		return -EINVAL;
 	if (!netif_device_present(dev))
 		return -ENODEV;
+	if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))
+		return 0;
 	err = dev_pre_changeaddr_notify(dev, sa->sa_data, extack);
 	if (err)
 		return err;