Merge branch 'net-Get-rid-of-switchdev_port_attr_get'

Florian Fainelli says:

====================
net: Get rid of switchdev_port_attr_get()

This patch series splits the removal of the switchdev_ops that was
proposed a few times before and first tackles the easy part which is the
removal of the single call to switchdev_port_attr_get() within the
bridge code.

As suggestd by Ido, this patch series adds a
SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS which is used in the same
context as the caller of switchdev_port_attr_set(), so not deferred, and
then the operation is carried out in deferred context with setting a
support bridge port flag.

Follow-up patches will do the switchdev_ops removal after introducing
the proper helpers for the switchdev blocking notifier to work across
stacked devices (unlike the previous submissions).

David this does depend on Russell's "[PATCH net-next v5 0/3] net: dsa:
mv88e6xxx: fix IPv6".

Changes in v3:

- rebased against net-next/master after Russell's IPv6 changes to DSA
- ignore prepare/commit phase for PRE_BRIDGE_FLAGS since we don't
  want to trigger the WARN() in net/switchdev/switchdev.c in the commit
  phase

Changes in v2:

- differentiate callers not supporting switchdev_port_attr_set() from
  the driver not being able to support specific bridge flags

- pass "mask" instead of "flags" for the PRE_BRIDGE_FLAGS check

- skip prepare phase for PRE_BRIDGE_FLAGS

- corrected documentation a bit more

- tested bridge_vlan_aware.sh with veth/VRF
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/networking/switchdev.txt

@@ -232,10 +232,8 @@ Learning_sync attribute enables syncing of the learned/forgotten FDB entry to
 the bridge's FDB.  It's possible, but not optimal, to enable learning on the
 device port and on the bridge port, and disable learning_sync.
 
-To support learning and learning_sync port attributes, the driver implements
-switchdev op switchdev_port_attr_get/set for
-SWITCHDEV_ATTR_PORT_ID_BRIDGE_FLAGS. The driver should initialize the attributes
-to the hardware defaults.
+To support learning, the driver implements switchdev op
+switchdev_port_attr_set for SWITCHDEV_ATTR_PORT_ID_{PRE}_BRIDGE_FLAGS.
 
 FDB Ageing
 ^^^^^^^^^^

drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c

@@ -431,21 +431,6 @@ static void mlxsw_sp_bridge_vlan_put(struct mlxsw_sp_bridge_vlan *bridge_vlan)
 		mlxsw_sp_bridge_vlan_destroy(bridge_vlan);
 }
 
-static int mlxsw_sp_port_attr_get(struct net_device *dev,
-				  struct switchdev_attr *attr)
-{
-	switch (attr->id) {
-	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT:
-		attr->u.brport_flags_support = BR_LEARNING | BR_FLOOD |
-					       BR_MCAST_FLOOD;
-		break;
-	default:
-		return -EOPNOTSUPP;
-	}
-
-	return 0;
-}
-
 static int
 mlxsw_sp_port_bridge_vlan_stp_set(struct mlxsw_sp_port *mlxsw_sp_port,
 				  struct mlxsw_sp_bridge_vlan *bridge_vlan,
@@ -595,6 +580,17 @@ mlxsw_sp_bridge_port_learning_set(struct mlxsw_sp_port *mlxsw_sp_port,
 	return err;
 }
 
+static int mlxsw_sp_port_attr_br_pre_flags_set(struct mlxsw_sp_port
+					       *mlxsw_sp_port,
+					       struct switchdev_trans *trans,
+					       unsigned long brport_flags)
+{
+	if (brport_flags & ~(BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD))
+		return -EINVAL;
+
+	return 0;
+}
+
 static int mlxsw_sp_port_attr_br_flags_set(struct mlxsw_sp_port *mlxsw_sp_port,
 					   struct switchdev_trans *trans,
 					   struct net_device *orig_dev,
@@ -841,6 +837,11 @@ static int mlxsw_sp_port_attr_set(struct net_device *dev,
 						       attr->orig_dev,
 						       attr->u.stp_state);
 		break;
+	case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
+		err = mlxsw_sp_port_attr_br_pre_flags_set(mlxsw_sp_port,
+							  trans,
+							  attr->u.brport_flags);
+		break;
 	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 		err = mlxsw_sp_port_attr_br_flags_set(mlxsw_sp_port, trans,
 						      attr->orig_dev,
@@ -1938,7 +1939,6 @@ static struct mlxsw_sp_port *mlxsw_sp_lag_rep_port(struct mlxsw_sp *mlxsw_sp,
 }
 
 static const struct switchdev_ops mlxsw_sp_port_switchdev_ops = {
-	.switchdev_port_attr_get	= mlxsw_sp_port_attr_get,
 	.switchdev_port_attr_set	= mlxsw_sp_port_attr_set,
 };
 

drivers/net/ethernet/rocker/rocker_main.c

@@ -1566,34 +1566,57 @@ static int rocker_world_port_attr_stp_state_set(struct rocker_port *rocker_port,
 }
 
 static int
-rocker_world_port_attr_bridge_flags_set(struct rocker_port *rocker_port,
-					unsigned long brport_flags,
-					struct switchdev_trans *trans)
+rocker_world_port_attr_bridge_flags_support_get(const struct rocker_port *
+						rocker_port,
+						unsigned long *
+						p_brport_flags_support)
+{
+	struct rocker_world_ops *wops = rocker_port->rocker->wops;
+
+	if (!wops->port_attr_bridge_flags_support_get)
+		return -EOPNOTSUPP;
+	return wops->port_attr_bridge_flags_support_get(rocker_port,
+							p_brport_flags_support);
+}
+
+static int
+rocker_world_port_attr_pre_bridge_flags_set(struct rocker_port *rocker_port,
+					    unsigned long brport_flags,
+					    struct switchdev_trans *trans)
 {
 	struct rocker_world_ops *wops = rocker_port->rocker->wops;
+	unsigned long brport_flags_s;
+	int err;
 
 	if (!wops->port_attr_bridge_flags_set)
 		return -EOPNOTSUPP;
 
-	if (switchdev_trans_ph_prepare(trans))
-		return 0;
+	err = rocker_world_port_attr_bridge_flags_support_get(rocker_port,
+							      &brport_flags_s);
+	if (err)
+		return err;
 
-	return wops->port_attr_bridge_flags_set(rocker_port, brport_flags,
-						trans);
+	if (brport_flags & ~brport_flags_s)
+		return -EINVAL;
+
+	return 0;
 }
 
 static int
-rocker_world_port_attr_bridge_flags_support_get(const struct rocker_port *
-						rocker_port,
-						unsigned long *
-						p_brport_flags_support)
+rocker_world_port_attr_bridge_flags_set(struct rocker_port *rocker_port,
+					unsigned long brport_flags,
+					struct switchdev_trans *trans)
 {
 	struct rocker_world_ops *wops = rocker_port->rocker->wops;
 
-	if (!wops->port_attr_bridge_flags_support_get)
+	if (!wops->port_attr_bridge_flags_set)
 		return -EOPNOTSUPP;
-	return wops->port_attr_bridge_flags_support_get(rocker_port,
-							p_brport_flags_support);
+
+	if (switchdev_trans_ph_prepare(trans))
+		return 0;
+
+	return wops->port_attr_bridge_flags_set(rocker_port, brport_flags,
+						trans);
 }
 
 static int
@@ -2043,24 +2066,6 @@ static const struct net_device_ops rocker_port_netdev_ops = {
  * swdev interface
  ********************/
 
-static int rocker_port_attr_get(struct net_device *dev,
-				struct switchdev_attr *attr)
-{
-	const struct rocker_port *rocker_port = netdev_priv(dev);
-	int err = 0;
-
-	switch (attr->id) {
-	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT:
-		err = rocker_world_port_attr_bridge_flags_support_get(rocker_port,
-								      &attr->u.brport_flags_support);
-		break;
-	default:
-		return -EOPNOTSUPP;
-	}
-
-	return err;
-}
-
 static int rocker_port_attr_set(struct net_device *dev,
 				const struct switchdev_attr *attr,
 				struct switchdev_trans *trans)
@@ -2074,6 +2079,10 @@ static int rocker_port_attr_set(struct net_device *dev,
 							   attr->u.stp_state,
 							   trans);
 		break;
+	case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
+		err = rocker_world_port_attr_pre_bridge_flags_set(rocker_port,
+							      attr->u.brport_flags,
+							      trans);
 	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 		err = rocker_world_port_attr_bridge_flags_set(rocker_port,
 							      attr->u.brport_flags,
@@ -2133,7 +2142,6 @@ static int rocker_port_obj_del(struct net_device *dev,
 }
 
 static const struct switchdev_ops rocker_port_switchdev_ops = {
-	.switchdev_port_attr_get	= rocker_port_attr_get,
 	.switchdev_port_attr_set	= rocker_port_attr_set,
 };
 

drivers/staging/fsl-dpaa2/ethsw/ethsw.c

@@ -640,20 +640,6 @@ static void ethsw_teardown_irqs(struct fsl_mc_device *sw_dev)
 	fsl_mc_free_irqs(sw_dev);
 }
 
-static int swdev_port_attr_get(struct net_device *netdev,
-			       struct switchdev_attr *attr)
-{
-	switch (attr->id) {
-	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT:
-		attr->u.brport_flags_support = BR_LEARNING | BR_FLOOD;
-		break;
-	default:
-		return -EOPNOTSUPP;
-	}
-
-	return 0;
-}
-
 static int port_attr_stp_state_set(struct net_device *netdev,
 				   struct switchdev_trans *trans,
 				   u8 state)
@@ -666,6 +652,16 @@ static int port_attr_stp_state_set(struct net_device *netdev,
 	return ethsw_port_set_stp_state(port_priv, state);
 }
 
+static int port_attr_br_flags_pre_set(struct net_device *netdev,
+				      struct switchdev_trans *trans,
+				      unsigned long flags)
+{
+	if (flags & ~(BR_LEARNING | BR_FLOOD))
+		return -EINVAL;
+
+	return 0;
+}
+
 static int port_attr_br_flags_set(struct net_device *netdev,
 				  struct switchdev_trans *trans,
 				  unsigned long flags)
@@ -698,6 +694,10 @@ static int swdev_port_attr_set(struct net_device *netdev,
 		err = port_attr_stp_state_set(netdev, trans,
 					      attr->u.stp_state);
 		break;
+	case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
+		err = port_attr_br_flags_pre_set(netdev, trans,
+						 attr->u.brport_flags);
+		break;
 	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 		err = port_attr_br_flags_set(netdev, trans,
 					     attr->u.brport_flags);
@@ -926,7 +926,6 @@ static int swdev_port_obj_del(struct net_device *netdev,
 }
 
 static const struct switchdev_ops ethsw_port_switchdev_ops = {
-	.switchdev_port_attr_get	= swdev_port_attr_get,
 	.switchdev_port_attr_set	= swdev_port_attr_set,
 };
 

include/net/switchdev.h

@@ -45,7 +45,7 @@ enum switchdev_attr_id {
 	SWITCHDEV_ATTR_ID_UNDEFINED,
 	SWITCHDEV_ATTR_ID_PORT_STP_STATE,
 	SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS,
-	SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT,
+	SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS,
 	SWITCHDEV_ATTR_ID_PORT_MROUTER,
 	SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME,
 	SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
@@ -61,8 +61,7 @@ struct switchdev_attr {
 	void (*complete)(struct net_device *dev, int err, void *priv);
 	union {
 		u8 stp_state;				/* PORT_STP_STATE */
-		unsigned long brport_flags;		/* PORT_BRIDGE_FLAGS */
-		unsigned long brport_flags_support;	/* PORT_BRIDGE_FLAGS_SUPPORT */
+		unsigned long brport_flags;		/* PORT_{PRE}_BRIDGE_FLAGS */
 		bool mrouter;				/* PORT_MROUTER */
 		clock_t ageing_time;			/* BRIDGE_AGEING_TIME */
 		bool vlan_filtering;			/* BRIDGE_VLAN_FILTERING */
@@ -180,8 +179,6 @@ switchdev_notifier_info_to_extack(const struct switchdev_notifier_info *info)
 #ifdef CONFIG_NET_SWITCHDEV
 
 void switchdev_deferred_process(void);
-int switchdev_port_attr_get(struct net_device *dev,
-			    struct switchdev_attr *attr);
 int switchdev_port_attr_set(struct net_device *dev,
 			    const struct switchdev_attr *attr);
 int switchdev_port_obj_add(struct net_device *dev,
@@ -226,12 +223,6 @@ static inline void switchdev_deferred_process(void)
 {
 }
 
-static inline int switchdev_port_attr_get(struct net_device *dev,
-					  struct switchdev_attr *attr)
-{
-	return -EOPNOTSUPP;
-}
-
 static inline int switchdev_port_attr_set(struct net_device *dev,
 					  const struct switchdev_attr *attr)
 {

net/bridge/br_switchdev.c

@@ -64,21 +64,19 @@ int br_switchdev_set_port_flag(struct net_bridge_port *p,
 {
 	struct switchdev_attr attr = {
 		.orig_dev = p->dev,
-		.id = SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT,
+		.id = SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS,
+		.u.brport_flags = mask,
 	};
 	int err;
 
 	if (mask & ~BR_PORT_FLAGS_HW_OFFLOAD)
 		return 0;
 
-	err = switchdev_port_attr_get(p->dev, &attr);
+	err = switchdev_port_attr_set(p->dev, &attr);
 	if (err == -EOPNOTSUPP)
 		return 0;
-	if (err)
-		return err;
 
-	/* Check if specific bridge flag attribute offload is supported */
-	if (!(attr.u.brport_flags_support & mask)) {
+	if (err) {
 		br_warn(p->br, "bridge flag offload is not supported %u(%s)\n",
 			(unsigned int)p->port_no, p->dev->name);
 		return -EOPNOTSUPP;
@@ -87,6 +85,7 @@ int br_switchdev_set_port_flag(struct net_bridge_port *p,
 	attr.id = SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS;
 	attr.flags = SWITCHDEV_F_DEFER;
 	attr.u.brport_flags = flags;
+
 	err = switchdev_port_attr_set(p->dev, &attr);
 	if (err) {
 		br_warn(p->br, "error setting offload flag on port %u(%s)\n",

net/dsa/dsa_priv.h

@@ -160,6 +160,8 @@ int dsa_port_mdb_add(const struct dsa_port *dp,
 		     struct switchdev_trans *trans);
 int dsa_port_mdb_del(const struct dsa_port *dp,
 		     const struct switchdev_obj_port_mdb *mdb);
+int dsa_port_pre_bridge_flags(const struct dsa_port *dp, unsigned long flags,
+			      struct switchdev_trans *trans);
 int dsa_port_bridge_flags(const struct dsa_port *dp, unsigned long flags,
 			  struct switchdev_trans *trans);
 int dsa_port_vlan_add(struct dsa_port *dp,

net/dsa/port.c

@@ -187,6 +187,18 @@ int dsa_port_ageing_time(struct dsa_port *dp, clock_t ageing_clock,
 	return dsa_port_notify(dp, DSA_NOTIFIER_AGEING_TIME, &info);
 }
 
+int dsa_port_pre_bridge_flags(const struct dsa_port *dp, unsigned long flags,
+			      struct switchdev_trans *trans)
+{
+	struct dsa_switch *ds = dp->ds;
+
+	if (!ds->ops->port_egress_floods ||
+	    (flags & ~(BR_FLOOD | BR_MCAST_FLOOD)))
+		return -EINVAL;
+
+	return 0;
+}
+
 int dsa_port_bridge_flags(const struct dsa_port *dp, unsigned long flags,
 			  struct switchdev_trans *trans)
 {

net/dsa/slave.c

@@ -295,6 +295,10 @@ static int dsa_slave_port_attr_set(struct net_device *dev,
 	case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
 		ret = dsa_port_ageing_time(dp, attr->u.ageing_time, trans);
 		break;
+	case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
+		ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags,
+						trans);
+		break;
 	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 		ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, trans);
 		break;
@@ -381,26 +385,6 @@ static int dsa_slave_get_port_parent_id(struct net_device *dev,
 	return 0;
 }
 
-static int dsa_slave_port_attr_get(struct net_device *dev,
-				   struct switchdev_attr *attr)
-{
-	struct dsa_port *dp = dsa_slave_to_port(dev);
-	struct dsa_switch *ds = dp->ds;
-
-	switch (attr->id) {
-	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT:
-		attr->u.brport_flags_support = 0;
-		if (ds->ops->port_egress_floods)
-			attr->u.brport_flags_support |= BR_FLOOD |
-							BR_MCAST_FLOOD;
-		break;
-	default:
-		return -EOPNOTSUPP;
-	}
-
-	return 0;
-}
-
 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 						     struct sk_buff *skb)
 {
@@ -1067,7 +1051,6 @@ static const struct net_device_ops dsa_slave_netdev_ops = {
 };
 
 static const struct switchdev_ops dsa_slave_switchdev_ops = {
-	.switchdev_port_attr_get	= dsa_slave_port_attr_get,
 	.switchdev_port_attr_set	= dsa_slave_port_attr_set,
 };