Linux Ethernet Bridging - Feb 2019 - [Bridge] [PATCH net-next v3 6/8] net: bridge: Stop calling switchdev_port_attr_get()

Hi all,

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

Florian Fainelli (8):
  net: switchdev: Add PORT_PRE_BRIDGE_FLAGS
  mlxsw: spectrum: Handle PORT_PRE_BRIDGE_FLAGS
  staging: fsl-dpaa2: ethsw: Handle PORT_PRE_BRIDGE_FLAGS
  net: dsa: Add setter for SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS
  rocker: Check Handle PORT_PRE_BRIDGE_FLAGS
  net: bridge: Stop calling switchdev_port_attr_get()
  net: Remove SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT
  net: Get rid of switchdev_port_attr_get()

 Documentation/networking/switchdev.txt        |  6 +-
 .../mellanox/mlxsw/spectrum_switchdev.c       | 32 ++++----
 drivers/net/ethernet/rocker/rocker_main.c     | 74 ++++++++++---------
 drivers/staging/fsl-dpaa2/ethsw/ethsw.c       | 29 ++++----
 include/net/switchdev.h                       | 13 +---
 net/bridge/br_switchdev.c                     | 11 ++-
 net/dsa/dsa_priv.h                            |  2 +
 net/dsa/port.c                                | 12 +++
 net/dsa/slave.c                               | 25 +------
 9 files changed, 98 insertions(+), 106 deletions(-)

-- 
2.17.1

In preparation for removing switchdev_port_attr_get(), introduce
PORT_PRE_BRIDGE_FLAGS which will be called through
switchdev_port_attr_set(), in the caller's context (possibly atomic) and
which must be checked by the switchdev driver in order to return whether
the operation is supported or not.

This is entirely analoguous to how the BRIDGE_FLAGS_SUPPORT works,
except it goes through a set() instead of get().

Signed-off-by: Florian Fainelli <f.fainelli at gmail.com>
---
 include/net/switchdev.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/net/switchdev.h b/include/net/switchdev.h
index 5e87b54c5dc5..de72b0a3867f 100644
--- a/include/net/switchdev.h
+++ b/include/net/switchdev.h
@@ -46,6 +46,7 @@ enum switchdev_attr_id {
 	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,
@@ -61,7 +62,7 @@ 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;		/* PORT_{PRE}_BRIDGE_FLAGS */
 		unsigned long brport_flags_support;	/* PORT_BRIDGE_FLAGS_SUPPORT */
 		bool mrouter;				/* PORT_MROUTER */
 		clock_t ageing_time;			/* BRIDGE_AGEING_TIME */
-- 
2.17.1

In preparation for getting rid of switchdev_port_attr_get(), have mlxsw
check for the bridge flags being set through switchdev_port_attr_set()
when the SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS attribute identifier is
used.

Signed-off-by: Florian Fainelli <f.fainelli at gmail.com>
---
 .../ethernet/mellanox/mlxsw/spectrum_switchdev.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
index 1f492b7dbea8..9a8798f74d2b 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
@@ -595,6 +595,17 @@ 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 +852,11 @@ 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,
-- 
2.17.1

In preparation for removing SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT,
handle the SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS attribute and check
that the bridge port flags being configured are supported.

Signed-off-by: Florian Fainelli <f.fainelli at gmail.com>
---
 drivers/staging/fsl-dpaa2/ethsw/ethsw.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
b/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
index 1b3943b71254..331625137717 100644
--- a/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
+++ b/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
@@ -666,6 +666,16 @@ 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 +708,10 @@ 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);
-- 
2.17.1

In preparation for removing SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT,
add support for a function that processes the
SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS and
SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS attributes and returns not
supported for any flag set, since DSA does not currently support
toggling those bridge port attributes (yet).

Signed-off-by: Florian Fainelli <f.fainelli at gmail.com>
---
 net/dsa/dsa_priv.h |  2 ++
 net/dsa/port.c     | 12 ++++++++++++
 net/dsa/slave.c    |  4 ++++
 3 files changed, 18 insertions(+)

diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index f4f99ec29f5d..47a1d1379d15 100644
--- a/net/dsa/dsa_priv.h
+++ b/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,
diff --git a/net/dsa/port.c b/net/dsa/port.c
index 7bc2a5ad95c6..e9b5b50f8cf1 100644
--- a/net/dsa/port.c
+++ b/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)
 {
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 85dc68611002..44cc4e50dd5a 100644
--- a/net/dsa/slave.c
+++ b/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;
-- 
2.17.1

In preparation for getting rid of switchdev_port_attr_get(), have rocker
check for the bridge flags being set through switchdev_port_attr_set()
with the SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS attribute identifier.

Signed-off-by: Florian Fainelli <f.fainelli at gmail.com>
---
 drivers/net/ethernet/rocker/rocker_main.c | 55 +++++++++++++++++------
 1 file changed, 41 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ethernet/rocker/rocker_main.c
b/drivers/net/ethernet/rocker/rocker_main.c
index 5ce8d5aba603..25129f7b5583 100644
--- a/drivers/net/ethernet/rocker/rocker_main.c
+++ b/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
@@ -2074,6 +2097,10 @@ 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,
-- 
2.17.1

Now that all switchdev drivers have been converted to check the
SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS flags and report flags that they
do not support accordingly, we can migrate the bridge code to try to set
that attribute first, check the results and then do the actual setting.

Signed-off-by: Florian Fainelli <f.fainelli at gmail.com>
---
 net/bridge/br_switchdev.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/net/bridge/br_switchdev.c b/net/bridge/br_switchdev.c
index db9e8ab96d48..af57c4a2b78a 100644
--- a/net/bridge/br_switchdev.c
+++ b/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",
-- 
2.17.1

Now that we have converted the bridge code and the drivers to check for
bridge port(s) flags at the time we try to set them, there is no need
for a get() -> set() sequence anymore and
SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT therefore becomes unused.

Reviewed-by: Ido Schimmel <idosch at mellanox.com>
Signed-off-by: Florian Fainelli <f.fainelli at gmail.com>
---
 Documentation/networking/switchdev.txt           |  6 ++----
 .../ethernet/mellanox/mlxsw/spectrum_switchdev.c | 11 +----------
 drivers/net/ethernet/rocker/rocker_main.c        | 14 +-------------
 drivers/staging/fsl-dpaa2/ethsw/ethsw.c          | 10 +---------
 include/net/switchdev.h                          |  2 --
 net/dsa/slave.c                                  | 16 +---------------
 6 files changed, 6 insertions(+), 53 deletions(-)

diff --git a/Documentation/networking/switchdev.txt
b/Documentation/networking/switchdev.txt
index f3244d87512a..79c8b0f16aee 100644
--- a/Documentation/networking/switchdev.txt
+++ b/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_get/set for SWITCHDEV_ATTR_PORT_ID_BRIDGE_FLAGS.
 
 FDB Ageing
 ^^^^^^^^^^
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
index 9a8798f74d2b..bbb5a406232e 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
@@ -434,16 +434,7 @@ static void mlxsw_sp_bridge_vlan_put(struct
mlxsw_sp_bridge_vlan *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;
+	return -EOPNOTSUPP;
 }
 
 static int
diff --git a/drivers/net/ethernet/rocker/rocker_main.c
b/drivers/net/ethernet/rocker/rocker_main.c
index 25129f7b5583..6b8273e2057d 100644
--- a/drivers/net/ethernet/rocker/rocker_main.c
+++ b/drivers/net/ethernet/rocker/rocker_main.c
@@ -2069,19 +2069,7 @@ static const struct net_device_ops rocker_port_netdev_ops
= {
 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;
+	return -EOPNOTSUPP;
 }
 
 static int rocker_port_attr_set(struct net_device *dev,
diff --git a/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
b/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
index 331625137717..de4dcabbc29a 100644
--- a/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
+++ b/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
@@ -643,15 +643,7 @@ static void ethsw_teardown_irqs(struct fsl_mc_device
*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;
+	return -EOPNOTSUPP;
 }
 
 static int port_attr_stp_state_set(struct net_device *netdev,
diff --git a/include/net/switchdev.h b/include/net/switchdev.h
index de72b0a3867f..0f352019ef99 100644
--- a/include/net/switchdev.h
+++ b/include/net/switchdev.h
@@ -45,7 +45,6 @@ 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,
@@ -63,7 +62,6 @@ struct switchdev_attr {
 	union {
 		u8 stp_state;				/* PORT_STP_STATE */
 		unsigned long brport_flags;		/* PORT_{PRE}_BRIDGE_FLAGS */
-		unsigned long brport_flags_support;	/* PORT_BRIDGE_FLAGS_SUPPORT */
 		bool mrouter;				/* PORT_MROUTER */
 		clock_t ageing_time;			/* BRIDGE_AGEING_TIME */
 		bool vlan_filtering;			/* BRIDGE_VLAN_FILTERING */
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 44cc4e50dd5a..db0a2651070f 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -388,21 +388,7 @@ static int dsa_slave_get_port_parent_id(struct net_device
*dev,
 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;
+	return -EOPNOTSUPP;
 }
 
 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
-- 
2.17.1

With the bridge no longer calling switchdev_port_attr_get() to obtain
the supported bridge port flags from a driver but instead trying to set
the bridge port flags directly and relying on driver to reject
unsupported configurations, we can effectively get rid of
switchdev_port_attr_get() entirely since this was the only place where
it was called.

Signed-off-by: Florian Fainelli <f.fainelli at gmail.com>
---
 Documentation/networking/switchdev.txt                   | 2 +-
 drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c | 7 -------
 drivers/net/ethernet/rocker/rocker_main.c                | 7 -------
 drivers/staging/fsl-dpaa2/ethsw/ethsw.c                  | 7 -------
 include/net/switchdev.h                                  | 8 --------
 net/dsa/slave.c                                          | 7 -------
 6 files changed, 1 insertion(+), 37 deletions(-)

diff --git a/Documentation/networking/switchdev.txt
b/Documentation/networking/switchdev.txt
index 79c8b0f16aee..413abbae952f 100644
--- a/Documentation/networking/switchdev.txt
+++ b/Documentation/networking/switchdev.txt
@@ -233,7 +233,7 @@ 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, the driver implements switchdev op
-switchdev_port_attr_get/set for SWITCHDEV_ATTR_PORT_ID_BRIDGE_FLAGS.
+switchdev_port_attr_set for SWITCHDEV_ATTR_PORT_ID_{PRE}_BRIDGE_FLAGS.
 
 FDB Ageing
 ^^^^^^^^^^
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
index bbb5a406232e..766f5b5f1cf5 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
@@ -431,12 +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)
-{
-	return -EOPNOTSUPP;
-}
-
 static int
 mlxsw_sp_port_bridge_vlan_stp_set(struct mlxsw_sp_port *mlxsw_sp_port,
 				  struct mlxsw_sp_bridge_vlan *bridge_vlan,
@@ -1945,7 +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,
 };
 
diff --git a/drivers/net/ethernet/rocker/rocker_main.c
b/drivers/net/ethernet/rocker/rocker_main.c
index 6b8273e2057d..8200fbf91306 100644
--- a/drivers/net/ethernet/rocker/rocker_main.c
+++ b/drivers/net/ethernet/rocker/rocker_main.c
@@ -2066,12 +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)
-{
-	return -EOPNOTSUPP;
-}
-
 static int rocker_port_attr_set(struct net_device *dev,
 				const struct switchdev_attr *attr,
 				struct switchdev_trans *trans)
@@ -2148,7 +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,
 };
 
diff --git a/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
b/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
index de4dcabbc29a..018399ee8731 100644
--- a/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
+++ b/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
@@ -640,12 +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)
-{
-	return -EOPNOTSUPP;
-}
-
 static int port_attr_stp_state_set(struct net_device *netdev,
 				   struct switchdev_trans *trans,
 				   u8 state)
@@ -932,7 +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,
 };
 
diff --git a/include/net/switchdev.h b/include/net/switchdev.h
index 0f352019ef99..45310ddf2d7e 100644
--- a/include/net/switchdev.h
+++ b/include/net/switchdev.h
@@ -179,8 +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,
@@ -225,12 +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)
 {
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index db0a2651070f..a78b2bba0332 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -385,12 +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)
-{
-	return -EOPNOTSUPP;
-}
-
 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
 						     struct sk_buff *skb)
 {
@@ -1057,7 +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,
 };
 
-- 
2.17.1