[PATCH net-next v5 2/3] net: dsa: rzn1-a5psw: add support for .port_bridge_flags

alexis.lothore
2023-08-10T09:36:21Z

From: Clément Léger <clement.leger@bootlin.com>

When running vlan test (bridge_vlan_aware/unaware.sh), there were some
failure due to the lack .port_bridge_flag function to disable port
flooding. Implement this operation for BR_LEARNING, BR_FLOOD,
BR_MCAST_FLOOD and BR_BCAST_FLOOD.

Since .port_bridge_flags affects the bits disabling learning for a port,
ensure that any other modification on the same register done by
a5psw_port_stp_state_set is in sync by using the port learning state to
enable/disable learning on the port.

Signed-off-by: Clément Léger <clement.leger@bootlin.com>
Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.com>
---
Changes since v4:
- ensure that learning and flooding masks are not updated if port does not
belong to bridge
- remove reviewed-by since patch is modified
---
drivers/net/dsa/rzn1_a5psw.c | 60 ++++++++++++++++++++++++++++++++++--
1 file changed, 58 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/rzn1_a5psw.c b/drivers/net/dsa/rzn1_a5psw.c
index 302529edb4e0..e4a93dad1d58 100644
--- a/drivers/net/dsa/rzn1_a5psw.c
+++ b/drivers/net/dsa/rzn1_a5psw.c
@@ -380,9 +380,63 @@ static void a5psw_port_bridge_leave(struct dsa_switch *ds, int port,
a5psw->br_dev = NULL;
}

+static int a5psw_port_pre_bridge_flags(struct dsa_switch *ds, int port,
+ struct switchdev_brport_flags flags,
+ struct netlink_ext_ack *extack)
+{
+ if (flags.mask & ~(BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD |
+ BR_BCAST_FLOOD))
+ return -EINVAL;
+
+ return 0;
+}
+
+static int
+a5psw_port_bridge_flags(struct dsa_switch *ds, int port,
+ struct switchdev_brport_flags flags,
+ struct netlink_ext_ack *extack)
+{
+ struct a5psw *a5psw = ds->priv;
+ u32 val;
+
+ /* If a port is set as standalone, we do not want to be able to
+ * configure flooding nor learning which would result in joining the
+ * unique bridge. This can happen when a port leaves the bridge, in
+ * which case the DSA core will try to "clear" all flags for the
+ * standalone port (ie enable flooding, disable learning). In that case
+ * do not fail but do not apply the flags.
+ */
+ if (!(a5psw->bridged_ports & BIT(port)))
+ return 0;
+
+ if (flags.mask & BR_LEARNING) {
+ val = flags.val & BR_LEARNING ? 0 : A5PSW_INPUT_LEARN_DIS(port);
+ a5psw_reg_rmw(a5psw, A5PSW_INPUT_LEARN,
+ A5PSW_INPUT_LEARN_DIS(port), val);
+ }
+
+ if (flags.mask & BR_FLOOD) {
+ val = flags.val & BR_FLOOD ? BIT(port) : 0;
+ a5psw_reg_rmw(a5psw, A5PSW_UCAST_DEF_MASK, BIT(port), val);
+ }
+
+ if (flags.mask & BR_MCAST_FLOOD) {
+ val = flags.val & BR_MCAST_FLOOD ? BIT(port) : 0;
+ a5psw_reg_rmw(a5psw, A5PSW_MCAST_DEF_MASK, BIT(port), val);
+ }
+
+ if (flags.mask & BR_BCAST_FLOOD) {
+ val = flags.val & BR_BCAST_FLOOD ? BIT(port) : 0;
+ a5psw_reg_rmw(a5psw, A5PSW_BCAST_DEF_MASK, BIT(port), val);
+ }
+
+ return 0;
+}
+
static void a5psw_port_stp_state_set(struct dsa_switch *ds, int port, u8 state)
{
bool learning_enabled, rx_enabled, tx_enabled;
+ struct dsa_port *dp = dsa_to_port(ds, port);
struct a5psw *a5psw = ds->priv;

switch (state) {
@@ -396,12 +450,12 @@ static void a5psw_port_stp_state_set(struct dsa_switch *ds, int port, u8 state)
case BR_STATE_LEARNING:
rx_enabled = false;
tx_enabled = false;
- learning_enabled = true;
+ learning_enabled = dp->learning;
break;
case BR_STATE_FORWARDING:
rx_enabled = true;
tx_enabled = true;
- learning_enabled = true;
+ learning_enabled = dp->learning;
break;
default:
dev_err(ds->dev, "invalid STP state: %d\n", state);
@@ -801,6 +855,8 @@ static const struct dsa_switch_ops a5psw_switch_ops = {
.set_ageing_time = a5psw_set_ageing_time,
.port_bridge_join = a5psw_port_bridge_join,
.port_bridge_leave = a5psw_port_bridge_leave,
+ .port_pre_bridge_flags = a5psw_port_pre_bridge_flags,
+ .port_bridge_flags = a5psw_port_bridge_flags,
.port_stp_state_set = a5psw_port_stp_state_set,
.port_fast_age = a5psw_port_fast_age,
.port_fdb_add = a5psw_port_fdb_add,
--
2.41.0