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Message-Id: <20211026162625.1385035-3-vladimir.oltean@nxp.com>
Date: Tue, 26 Oct 2021 19:26:21 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: netdev@...r.kernel.org
Cc: Florian Fainelli <f.fainelli@...il.com>,
Andrew Lunn <andrew@...n.ch>,
Vivien Didelot <vivien.didelot@...il.com>,
Tobias Waldekranz <tobias@...dekranz.com>,
DENG Qingfang <dqfext@...il.com>,
Alvin Šipraga <alsi@...g-olufsen.dk>
Subject: [RFC PATCH net-next 2/6] net: dsa: assign a bridge number even without TX forwarding offload
The service where DSA assigns a unique bridge number for each forwarding
domain is useful even for drivers which do not implement the TX
forwarding offload feature.
For example, drivers might use the dp->bridge_num for FDB isolation.
So rename ds->num_fwd_offloading_bridges to ds->max_num_bridges, and
calculate a unique bridge_num for all drivers that set this value.
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
drivers/net/dsa/mv88e6xxx/chip.c | 4 +-
drivers/net/dsa/sja1105/sja1105_main.c | 2 +-
include/net/dsa.h | 10 ++--
net/dsa/port.c | 81 +++++++++++++++++---------
4 files changed, 63 insertions(+), 34 deletions(-)
diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 0d0ccb7f8ccd..ae09cbc2f42f 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -3183,8 +3183,8 @@ static int mv88e6xxx_setup(struct dsa_switch *ds)
* time.
*/
if (mv88e6xxx_has_pvt(chip))
- ds->num_fwd_offloading_bridges = MV88E6XXX_MAX_PVT_SWITCHES -
- ds->dst->last_switch - 1;
+ ds->max_num_bridges = MV88E6XXX_MAX_PVT_SWITCHES -
+ ds->dst->last_switch - 1;
mv88e6xxx_reg_lock(chip);
diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index c343effe2e96..355b56cf94d8 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -3139,7 +3139,7 @@ static int sja1105_setup(struct dsa_switch *ds)
ds->vlan_filtering_is_global = true;
ds->untag_bridge_pvid = true;
/* tag_8021q has 3 bits for the VBID, and the value 0 is reserved */
- ds->num_fwd_offloading_bridges = 7;
+ ds->max_num_bridges = 7;
/* Advertise the 8 egress queues */
ds->num_tx_queues = SJA1105_NUM_TC;
diff --git a/include/net/dsa.h b/include/net/dsa.h
index 56a90f05df49..970bc89a0062 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -413,12 +413,12 @@ struct dsa_switch {
*/
unsigned int num_lag_ids;
- /* Drivers that support bridge forwarding offload should set this to
- * the maximum number of bridges spanning the same switch tree (or all
- * trees, in the case of cross-tree bridging support) that can be
- * offloaded.
+ /* Drivers that support bridge forwarding offload or FDB isolation
+ * should set this to the maximum number of bridges spanning the same
+ * switch tree (or all trees, in the case of cross-tree bridging
+ * support) that can be offloaded.
*/
- unsigned int num_fwd_offloading_bridges;
+ unsigned int max_num_bridges;
size_t num_ports;
};
diff --git a/net/dsa/port.c b/net/dsa/port.c
index 1772817a1214..b7867746af15 100644
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -271,19 +271,15 @@ static void dsa_port_switchdev_unsync_attrs(struct dsa_port *dp)
}
static void dsa_port_bridge_tx_fwd_unoffload(struct dsa_port *dp,
- struct net_device *bridge_dev)
+ struct net_device *bridge_dev,
+ unsigned int bridge_num)
{
- unsigned int bridge_num = dp->bridge_num;
struct dsa_switch *ds = dp->ds;
/* No bridge TX forwarding offload => do nothing */
- if (!ds->ops->port_bridge_tx_fwd_unoffload || !dp->bridge_num)
+ if (!ds->ops->port_bridge_tx_fwd_unoffload || !bridge_num)
return;
- dp->bridge_num = 0;
-
- dsa_bridge_num_put(bridge_dev, bridge_num);
-
/* Notify the chips only once the offload has been deactivated, so
* that they can update their configuration accordingly.
*/
@@ -292,31 +288,60 @@ static void dsa_port_bridge_tx_fwd_unoffload(struct dsa_port *dp,
}
static bool dsa_port_bridge_tx_fwd_offload(struct dsa_port *dp,
- struct net_device *bridge_dev)
+ struct net_device *bridge_dev,
+ unsigned int bridge_num)
{
struct dsa_switch *ds = dp->ds;
- unsigned int bridge_num;
int err;
- if (!ds->ops->port_bridge_tx_fwd_offload)
- return false;
-
- bridge_num = dsa_bridge_num_get(bridge_dev,
- ds->num_fwd_offloading_bridges);
- if (!bridge_num)
+ /* FDB isolation is required for TX forwarding offload */
+ if (!ds->ops->port_bridge_tx_fwd_offload || !bridge_num)
return false;
- dp->bridge_num = bridge_num;
-
/* Notify the driver */
err = ds->ops->port_bridge_tx_fwd_offload(ds, dp->index, bridge_dev,
bridge_num);
- if (err) {
- dsa_port_bridge_tx_fwd_unoffload(dp, bridge_dev);
- return false;
+
+ return err ? false : true;
+}
+
+static int dsa_port_bridge_create(struct dsa_port *dp,
+ struct net_device *br,
+ struct netlink_ext_ack *extack)
+{
+ struct dsa_switch *ds = dp->ds;
+ unsigned int bridge_num;
+
+ dp->bridge_dev = br;
+
+ if (!ds->max_num_bridges)
+ return 0;
+
+ bridge_num = dsa_bridge_num_get(br, ds->max_num_bridges);
+ if (!bridge_num) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "Range of offloadable bridges exceeded");
+ return -EOPNOTSUPP;
}
- return true;
+ dp->bridge_num = bridge_num;
+
+ return 0;
+}
+
+static void dsa_port_bridge_destroy(struct dsa_port *dp,
+ const struct net_device *br)
+{
+ struct dsa_switch *ds = dp->ds;
+
+ dp->bridge_dev = NULL;
+
+ if (ds->max_num_bridges) {
+ int bridge_num = dp->bridge_num;
+
+ dp->bridge_num = 0;
+ dsa_bridge_num_put(br, bridge_num);
+ }
}
int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br,
@@ -336,7 +361,9 @@ int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br,
/* Here the interface is already bridged. Reflect the current
* configuration so that drivers can program their chips accordingly.
*/
- dp->bridge_dev = br;
+ err = dsa_port_bridge_create(dp, br, extack);
+ if (err)
+ return err;
brport_dev = dsa_port_to_bridge_port(dp);
@@ -344,7 +371,8 @@ int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br,
if (err)
goto out_rollback;
- tx_fwd_offload = dsa_port_bridge_tx_fwd_offload(dp, br);
+ tx_fwd_offload = dsa_port_bridge_tx_fwd_offload(dp, br,
+ dp->bridge_num);
err = switchdev_bridge_port_offload(brport_dev, dev, dp,
&dsa_slave_switchdev_notifier,
@@ -366,7 +394,7 @@ int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br,
out_rollback_unbridge:
dsa_broadcast(DSA_NOTIFIER_BRIDGE_LEAVE, &info);
out_rollback:
- dp->bridge_dev = NULL;
+ dsa_port_bridge_destroy(dp, br);
return err;
}
@@ -393,14 +421,15 @@ void dsa_port_bridge_leave(struct dsa_port *dp, struct net_device *br)
.port = dp->index,
.br = br,
};
+ int bridge_num = dp->bridge_num;
int err;
/* Here the port is already unbridged. Reflect the current configuration
* so that drivers can program their chips accordingly.
*/
- dp->bridge_dev = NULL;
+ dsa_port_bridge_destroy(dp, br);
- dsa_port_bridge_tx_fwd_unoffload(dp, br);
+ dsa_port_bridge_tx_fwd_unoffload(dp, br, bridge_num);
err = dsa_broadcast(DSA_NOTIFIER_BRIDGE_LEAVE, &info);
if (err)
--
2.25.1
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