[PATCHv2 net-next 3/5] team: use common function to compute the features

[Hangbin Liu <liuhangbin@gmail.com>]

Use the new helper netdev_compute_features_from_lowers() to compute the
team device features. This helper performs both the feature computation
and the netdev_change_features() call.

Note that such change replace the lower layer traversing currently done
using team->port_list with netdev_for_each_lower_dev(). Such change is
safe as `port_list` contains exactly the same elements as
`team->dev->adj_list.lower` and the helper is always invoked under the
RTNL lock.

With this change, the explicit netdev_change_features() in
team_add_slave() can be safely removed, as team_port_add()
already takes care of the notification via
netdev_compute_features_from_lowers(), and same thing for team_del_slave()

This also fixes missing computations for MPLS, XFRM, and TSO/GSO partial
features.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
---
 drivers/net/team/team_core.c | 73 ++----------------------------------
 1 file changed, 4 insertions(+), 69 deletions(-)

diff --git a/drivers/net/team/team_core.c b/drivers/net/team/team_core.c
index 17f07eb0ee52..018d876e140a 100644
--- a/drivers/net/team/team_core.c
+++ b/drivers/net/team/team_core.c
@@ -982,63 +982,6 @@ static void team_port_disable(struct team *team,
 	team_lower_state_changed(port);
 }
 
-#define TEAM_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
-			    NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | \
-			    NETIF_F_HIGHDMA | NETIF_F_LRO | \
-			    NETIF_F_GSO_ENCAP_ALL)
-
-#define TEAM_ENC_FEATURES	(NETIF_F_HW_CSUM | NETIF_F_SG | \
-				 NETIF_F_RXCSUM | NETIF_F_GSO_SOFTWARE)
-
-static void __team_compute_features(struct team *team)
-{
-	struct team_port *port;
-	netdev_features_t vlan_features = TEAM_VLAN_FEATURES;
-	netdev_features_t enc_features  = TEAM_ENC_FEATURES;
-	unsigned short max_hard_header_len = ETH_HLEN;
-	unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
-					IFF_XMIT_DST_RELEASE_PERM;
-
-	rcu_read_lock();
-	if (list_empty(&team->port_list))
-		goto done;
-
-	vlan_features = netdev_base_features(vlan_features);
-	enc_features = netdev_base_features(enc_features);
-
-	list_for_each_entry_rcu(port, &team->port_list, list) {
-		vlan_features = netdev_increment_features(vlan_features,
-					port->dev->vlan_features,
-					TEAM_VLAN_FEATURES);
-		enc_features =
-			netdev_increment_features(enc_features,
-						  port->dev->hw_enc_features,
-						  TEAM_ENC_FEATURES);
-
-		dst_release_flag &= port->dev->priv_flags;
-		if (port->dev->hard_header_len > max_hard_header_len)
-			max_hard_header_len = port->dev->hard_header_len;
-	}
-done:
-	rcu_read_unlock();
-
-	team->dev->vlan_features = vlan_features;
-	team->dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
-				     NETIF_F_HW_VLAN_CTAG_TX |
-				     NETIF_F_HW_VLAN_STAG_TX;
-	team->dev->hard_header_len = max_hard_header_len;
-
-	team->dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
-	if (dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
-		team->dev->priv_flags |= IFF_XMIT_DST_RELEASE;
-}
-
-static void team_compute_features(struct team *team)
-{
-	__team_compute_features(team);
-	netdev_change_features(team->dev);
-}
-
 static int team_port_enter(struct team *team, struct team_port *port)
 {
 	int err = 0;
@@ -1300,7 +1243,7 @@ static int team_port_add(struct team *team, struct net_device *port_dev,
 	port->index = -1;
 	list_add_tail_rcu(&port->list, &team->port_list);
 	team_port_enable(team, port);
-	__team_compute_features(team);
+	netdev_compute_features_from_lowers(team->dev);
 	__team_port_change_port_added(port, !!netif_oper_up(port_dev));
 	__team_options_change_check(team);
 
@@ -1382,7 +1325,7 @@ static int team_port_del(struct team *team, struct net_device *port_dev)
 	dev_set_mtu(port_dev, port->orig.mtu);
 	kfree_rcu(port, rcu);
 	netdev_info(dev, "Port device %s removed\n", portname);
-	__team_compute_features(team);
+	netdev_compute_features_from_lowers(team->dev);
 
 	return 0;
 }
@@ -1976,9 +1919,6 @@ static int team_add_slave(struct net_device *dev, struct net_device *port_dev,
 
 	err = team_port_add(team, port_dev, extack);
 
-	if (!err)
-		netdev_change_features(dev);
-
 	return err;
 }
 
@@ -1991,11 +1931,6 @@ static int team_del_slave(struct net_device *dev, struct net_device *port_dev)
 
 	err = team_port_del(team, port_dev);
 
-	if (err)
-		return err;
-
-	netdev_change_features(dev);
-
 	return err;
 }
 
@@ -2190,7 +2125,7 @@ static void team_setup(struct net_device *dev)
 
 	dev->features |= NETIF_F_GRO;
 
-	dev->hw_features = TEAM_VLAN_FEATURES |
+	dev->hw_features = VIRTUAL_DEV_VLAN_FEATURES |
 			   NETIF_F_HW_VLAN_CTAG_RX |
 			   NETIF_F_HW_VLAN_CTAG_FILTER |
 			   NETIF_F_HW_VLAN_STAG_RX |
@@ -2994,7 +2929,7 @@ static int team_device_event(struct notifier_block *unused,
 	case NETDEV_FEAT_CHANGE:
 		if (!port->team->notifier_ctx) {
 			port->team->notifier_ctx = true;
-			team_compute_features(port->team);
+			netdev_compute_features_from_lowers(port->team->dev);
 			port->team->notifier_ctx = false;
 		}
 		break;
-- 
2.50.1