thr3ads.net - Linux Ethernet Bridging - [Bridge] [RFC PATCH net-next 2/5] net: dsa: propagate flags down towards drivers [Jan 2023]

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Hans J. Schultz

2023-Jan-17 18:57 UTC

[Bridge] [RFC PATCH net-next 2/5] net: dsa: propagate flags down towards drivers

Dynamic FDB flag needs to be propagated through the DSA layer to be
added to drivers.
Use a u16 for fdb flags for future use, so that other flags can also be
sent the same way without having to change function interfaces.

Signed-off-by: Hans J. Schultz <netdev at kapio-technology.com>
---
 include/net/dsa.h |  2 ++
 net/dsa/port.c    | 28 ++++++++++++++++------------
 net/dsa/port.h    |  8 ++++----
 net/dsa/slave.c   | 17 +++++++++++++----
 net/dsa/switch.c  | 18 ++++++++++++------
 net/dsa/switch.h  |  1 +
 6 files changed, 48 insertions(+), 26 deletions(-)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 96086289aa9b..f697d56e52d5 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -818,6 +818,8 @@ static inline bool dsa_port_tree_same(const struct dsa_port
*a,
 	return a->ds->dst == b->ds->dst;
 }
 
+#define DSA_FDB_FLAG_DYNAMIC		BIT(0)
+
 typedef int dsa_fdb_dump_cb_t(const unsigned char *addr, u16 vid,
 			      bool is_static, void *data);
 struct dsa_switch_ops {
diff --git a/net/dsa/port.c b/net/dsa/port.c
index 67ad1adec2a2..65b8c4470d59 100644
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -976,12 +976,13 @@ int dsa_port_mtu_change(struct dsa_port *dp, int new_mtu)
 }
 
 int dsa_port_fdb_add(struct dsa_port *dp, const unsigned char *addr,
-		     u16 vid)
+		     u16 vid, u16 fdb_flags)
 {
 	struct dsa_notifier_fdb_info info = {
 		.dp = dp,
 		.addr = addr,
 		.vid = vid,
+		.fdb_flags = fdb_flags,
 		.db = {
 			.type = DSA_DB_BRIDGE,
 			.bridge = *dp->bridge,
@@ -999,12 +1000,13 @@ int dsa_port_fdb_add(struct dsa_port *dp, const unsigned
char *addr,
 }
 
 int dsa_port_fdb_del(struct dsa_port *dp, const unsigned char *addr,
-		     u16 vid)
+		     u16 vid, u16 fdb_flags)
 {
 	struct dsa_notifier_fdb_info info = {
 		.dp = dp,
 		.addr = addr,
 		.vid = vid,
+		.fdb_flags = fdb_flags,
 		.db = {
 			.type = DSA_DB_BRIDGE,
 			.bridge = *dp->bridge,
@@ -1019,12 +1021,13 @@ int dsa_port_fdb_del(struct dsa_port *dp, const unsigned
char *addr,
 
 static int dsa_port_host_fdb_add(struct dsa_port *dp,
 				 const unsigned char *addr, u16 vid,
-				 struct dsa_db db)
+				 u16 fdb_flags, struct dsa_db db)
 {
 	struct dsa_notifier_fdb_info info = {
 		.dp = dp,
 		.addr = addr,
 		.vid = vid,
+		.fdb_flags = fdb_flags,
 		.db = db,
 	};
 
@@ -1042,11 +1045,11 @@ int dsa_port_standalone_host_fdb_add(struct dsa_port
*dp,
 		.dp = dp,
 	};
 
-	return dsa_port_host_fdb_add(dp, addr, vid, db);
+	return dsa_port_host_fdb_add(dp, addr, vid, 0, db);
 }
 
-int dsa_port_bridge_host_fdb_add(struct dsa_port *dp,
-				 const unsigned char *addr, u16 vid)
+int dsa_port_bridge_host_fdb_add(struct dsa_port *dp, const unsigned char
*addr,
+				 u16 vid, u16 fdb_flags)
 {
 	struct net_device *master = dsa_port_to_master(dp);
 	struct dsa_db db = {
@@ -1065,17 +1068,18 @@ int dsa_port_bridge_host_fdb_add(struct dsa_port *dp,
 			return err;
 	}
 
-	return dsa_port_host_fdb_add(dp, addr, vid, db);
+	return dsa_port_host_fdb_add(dp, addr, vid, fdb_flags, db);
 }
 
 static int dsa_port_host_fdb_del(struct dsa_port *dp,
 				 const unsigned char *addr, u16 vid,
-				 struct dsa_db db)
+				 u16 fdb_flags, struct dsa_db db)
 {
 	struct dsa_notifier_fdb_info info = {
 		.dp = dp,
 		.addr = addr,
 		.vid = vid,
+		.fdb_flags = fdb_flags,
 		.db = db,
 	};
 
@@ -1093,11 +1097,11 @@ int dsa_port_standalone_host_fdb_del(struct dsa_port
*dp,
 		.dp = dp,
 	};
 
-	return dsa_port_host_fdb_del(dp, addr, vid, db);
+	return dsa_port_host_fdb_del(dp, addr, vid, 0, db);
 }
 
-int dsa_port_bridge_host_fdb_del(struct dsa_port *dp,
-				 const unsigned char *addr, u16 vid)
+int dsa_port_bridge_host_fdb_del(struct dsa_port *dp, const unsigned char
*addr,
+				 u16 vid, u16 fdb_flags)
 {
 	struct net_device *master = dsa_port_to_master(dp);
 	struct dsa_db db = {
@@ -1112,7 +1116,7 @@ int dsa_port_bridge_host_fdb_del(struct dsa_port *dp,
 			return err;
 	}
 
-	return dsa_port_host_fdb_del(dp, addr, vid, db);
+	return dsa_port_host_fdb_del(dp, addr, vid, fdb_flags, db);
 }
 
 int dsa_port_lag_fdb_add(struct dsa_port *dp, const unsigned char *addr,
diff --git a/net/dsa/port.h b/net/dsa/port.h
index 9c218660d223..0a4f487e3c05 100644
--- a/net/dsa/port.h
+++ b/net/dsa/port.h
@@ -47,17 +47,17 @@ int dsa_port_vlan_msti(struct dsa_port *dp,
 		       const struct switchdev_vlan_msti *msti);
 int dsa_port_mtu_change(struct dsa_port *dp, int new_mtu);
 int dsa_port_fdb_add(struct dsa_port *dp, const unsigned char *addr,
-		     u16 vid);
+		     u16 vid, u16 fdb_flags);
 int dsa_port_fdb_del(struct dsa_port *dp, const unsigned char *addr,
-		     u16 vid);
+		     u16 vid, u16 fdb_flags);
 int dsa_port_standalone_host_fdb_add(struct dsa_port *dp,
 				     const unsigned char *addr, u16 vid);
 int dsa_port_standalone_host_fdb_del(struct dsa_port *dp,
 				     const unsigned char *addr, u16 vid);
 int dsa_port_bridge_host_fdb_add(struct dsa_port *dp, const unsigned char
*addr,
-				 u16 vid);
+				 u16 vid, u16 fdb_flags);
 int dsa_port_bridge_host_fdb_del(struct dsa_port *dp, const unsigned char
*addr,
-				 u16 vid);
+				 u16 vid, u16 fdb_flags);
 int dsa_port_lag_fdb_add(struct dsa_port *dp, const unsigned char *addr,
 			 u16 vid);
 int dsa_port_lag_fdb_del(struct dsa_port *dp, const unsigned char *addr,
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index aab79c355224..b6381baa1ff3 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -39,6 +39,7 @@ struct dsa_switchdev_event_work {
 	 */
 	unsigned char addr[ETH_ALEN];
 	u16 vid;
+	u16 fdb_flags;
 	bool host_addr;
 };
 
@@ -3295,6 +3296,7 @@ static void dsa_slave_switchdev_event_work(struct
work_struct *work)
 		container_of(work, struct dsa_switchdev_event_work, work);
 	const unsigned char *addr = switchdev_work->addr;
 	struct net_device *dev = switchdev_work->dev;
+	u16 fdb_flags = switchdev_work->fdb_flags;
 	u16 vid = switchdev_work->vid;
 	struct dsa_switch *ds;
 	struct dsa_port *dp;
@@ -3306,11 +3308,12 @@ static void dsa_slave_switchdev_event_work(struct
work_struct *work)
 	switch (switchdev_work->event) {
 	case SWITCHDEV_FDB_ADD_TO_DEVICE:
 		if (switchdev_work->host_addr)
-			err = dsa_port_bridge_host_fdb_add(dp, addr, vid);
+			err = dsa_port_bridge_host_fdb_add(dp, addr,
+							   vid, fdb_flags);
 		else if (dp->lag)
 			err = dsa_port_lag_fdb_add(dp, addr, vid);
 		else
-			err = dsa_port_fdb_add(dp, addr, vid);
+			err = dsa_port_fdb_add(dp, addr, vid, fdb_flags);
 		if (err) {
 			dev_err(ds->dev,
 				"port %d failed to add %pM vid %d to fdb: %d\n",
@@ -3322,11 +3325,12 @@ static void dsa_slave_switchdev_event_work(struct
work_struct *work)
 
 	case SWITCHDEV_FDB_DEL_TO_DEVICE:
 		if (switchdev_work->host_addr)
-			err = dsa_port_bridge_host_fdb_del(dp, addr, vid);
+			err = dsa_port_bridge_host_fdb_del(dp, addr,
+							   vid, fdb_flags);
 		else if (dp->lag)
 			err = dsa_port_lag_fdb_del(dp, addr, vid);
 		else
-			err = dsa_port_fdb_del(dp, addr, vid);
+			err = dsa_port_fdb_del(dp, addr, vid, fdb_flags);
 		if (err) {
 			dev_err(ds->dev,
 				"port %d failed to delete %pM vid %d from fdb: %d\n",
@@ -3364,6 +3368,7 @@ static int dsa_slave_fdb_event(struct net_device *dev,
 	struct dsa_port *dp = dsa_slave_to_port(dev);
 	bool host_addr = fdb_info->is_local;
 	struct dsa_switch *ds = dp->ds;
+	u16 fdb_flags = 0;
 
 	if (ctx && ctx != dp)
 		return 0;
@@ -3410,6 +3415,9 @@ static int dsa_slave_fdb_event(struct net_device *dev,
 		   orig_dev->name, fdb_info->addr, fdb_info->vid,
 		   host_addr ? " as host address" : "");
 
+	if (fdb_info->is_dyn)
+		fdb_flags |= DSA_FDB_FLAG_DYNAMIC;
+
 	INIT_WORK(&switchdev_work->work, dsa_slave_switchdev_event_work);
 	switchdev_work->event = event;
 	switchdev_work->dev = dev;
@@ -3418,6 +3426,7 @@ static int dsa_slave_fdb_event(struct net_device *dev,
 	ether_addr_copy(switchdev_work->addr, fdb_info->addr);
 	switchdev_work->vid = fdb_info->vid;
 	switchdev_work->host_addr = host_addr;
+	switchdev_work->fdb_flags = fdb_flags;
 
 	dsa_schedule_work(&switchdev_work->work);
 
diff --git a/net/dsa/switch.c b/net/dsa/switch.c
index d5bc4bb7310d..9b0d6ce0f7da 100644
--- a/net/dsa/switch.c
+++ b/net/dsa/switch.c
@@ -239,7 +239,7 @@ static int dsa_port_do_mdb_del(struct dsa_port *dp,
 }
 
 static int dsa_port_do_fdb_add(struct dsa_port *dp, const unsigned char *addr,
-			       u16 vid, struct dsa_db db)
+			       u16 vid, u16 fdb_flags, struct dsa_db db)
 {
 	struct dsa_switch *ds = dp->ds;
 	struct dsa_mac_addr *a;
@@ -283,7 +283,7 @@ static int dsa_port_do_fdb_add(struct dsa_port *dp, const
unsigned char *addr,
 }
 
 static int dsa_port_do_fdb_del(struct dsa_port *dp, const unsigned char *addr,
-			       u16 vid, struct dsa_db db)
+			       u16 vid, u16 fdb_flags, struct dsa_db db)
 {
 	struct dsa_switch *ds = dp->ds;
 	struct dsa_mac_addr *a;
@@ -410,7 +410,9 @@ static int dsa_switch_host_fdb_add(struct dsa_switch *ds,
 								info->db);
 			} else {
 				err = dsa_port_do_fdb_add(dp, info->addr,
-							  info->vid, info->db);
+							  info->vid,
+							  info->fdb_flags,
+							  info->db);
 			}
 			if (err)
 				break;
@@ -438,7 +440,9 @@ static int dsa_switch_host_fdb_del(struct dsa_switch *ds,
 								info->db);
 			} else {
 				err = dsa_port_do_fdb_del(dp, info->addr,
-							  info->vid, info->db);
+							  info->vid,
+							  info->fdb_flags,
+							  info->db);
 			}
 			if (err)
 				break;
@@ -457,7 +461,8 @@ static int dsa_switch_fdb_add(struct dsa_switch *ds,
 	if (!ds->ops->port_fdb_add)
 		return -EOPNOTSUPP;
 
-	return dsa_port_do_fdb_add(dp, info->addr, info->vid, info->db);
+	return dsa_port_do_fdb_add(dp, info->addr, info->vid,
+				   info->fdb_flags, info->db);
 }
 
 static int dsa_switch_fdb_del(struct dsa_switch *ds,
@@ -469,7 +474,8 @@ static int dsa_switch_fdb_del(struct dsa_switch *ds,
 	if (!ds->ops->port_fdb_del)
 		return -EOPNOTSUPP;
 
-	return dsa_port_do_fdb_del(dp, info->addr, info->vid, info->db);
+	return dsa_port_do_fdb_del(dp, info->addr, info->vid,
+				   info->fdb_flags, info->db);
 }
 
 static int dsa_switch_lag_fdb_add(struct dsa_switch *ds,
diff --git a/net/dsa/switch.h b/net/dsa/switch.h
index 15e67b95eb6e..824ad7950785 100644
--- a/net/dsa/switch.h
+++ b/net/dsa/switch.h
@@ -55,6 +55,7 @@ struct dsa_notifier_fdb_info {
 	const struct dsa_port *dp;
 	const unsigned char *addr;
 	u16 vid;
+	u16 fdb_flags;
 	struct dsa_db db;
 };
 
-- 
2.34.1

Vladimir Oltean

2023-Jan-17 23:17 UTC

head link

[Bridge] [RFC PATCH net-next 2/5] net: dsa: propagate flags down towards drivers

On Tue, Jan 17, 2023 at 07:57:11PM +0100, Hans J. Schultz
wrote:> Dynamic FDB flag needs to be propagated through the DSA layer to be
> added to drivers.
> Use a u16 for fdb flags for future use, so that other flags can also be
> sent the same way without having to change function interfaces.
> 
> Signed-off-by: Hans J. Schultz <netdev at kapio-technology.com>
> ---
> @@ -3364,6 +3368,7 @@ static int dsa_slave_fdb_event(struct net_device
*dev,
>  	struct dsa_port *dp = dsa_slave_to_port(dev);
>  	bool host_addr = fdb_info->is_local;
>  	struct dsa_switch *ds = dp->ds;
> +	u16 fdb_flags = 0;
>  
>  	if (ctx && ctx != dp)
>  		return 0;
> @@ -3410,6 +3415,9 @@ static int dsa_slave_fdb_event(struct net_device
*dev,
>  		   orig_dev->name, fdb_info->addr, fdb_info->vid,
>  		   host_addr ? " as host address" : "");
>  
> +	if (fdb_info->is_dyn)
> +		fdb_flags |= DSA_FDB_FLAG_DYNAMIC;
> +
Hmm, I don't think this is going to work with the
assisted_learning_on_cpu_port
feature ("if (switchdev_fdb_is_dynamically_learned(fdb_info))"). The
reason being
that a "dynamically learned" FDB entry (defined as this):

static inline bool
switchdev_fdb_is_dynamically_learned(const struct switchdev_notifier_fdb_info
*fdb_info)
{
	return !fdb_info->added_by_user && !fdb_info->is_local;
}

is also dynamic in the DSA_FDB_FLAG_DYNAMIC sense. But we install a
static FDB entry for it on the CPU port.

And in your follow-up patch 3/5, you make all drivers except mv88e6xxx
ignore all DSA_FDB_FLAG_DYNAMIC entries (including the ones snooped from
address learning on software interfaces). So this breaks those drivers
which don't implement DSA_FDB_FLAG_DYNAMIC but do set
ds->assisted_learning_on_cpu_port
to true.

I think you also want to look at the added_by_user flag to disambiguate
between a dynamic FDB entry added from learning (which it's ok to
offload as static, because software ageing will remove it) and one added
by the user.
>  	INIT_WORK(&switchdev_work->work, dsa_slave_switchdev_event_work);
>  	switchdev_work->event = event;
>  	switchdev_work->dev = dev;
> @@ -3418,6 +3426,7 @@ static int dsa_slave_fdb_event(struct net_device
*dev,
>  	ether_addr_copy(switchdev_work->addr, fdb_info->addr);
>  	switchdev_work->vid = fdb_info->vid;
>  	switchdev_work->host_addr = host_addr;
> +	switchdev_work->fdb_flags = fdb_flags;
>  
>  	dsa_schedule_work(&switchdev_work->work);
>

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