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net: dsa: don't fast age standalone ports 

DSA drives the procedure to flush dynamic FDB entries from a port based
on the change of STP state: whenever we go from a state where address
learning is enabled (LEARNING, FORWARDING) to a state where it isn't
(LISTENING, BLOCKING, DISABLED), we need to flush the existing dynamic
entries.

However, there are cases when this is not needed. Internally, when a
DSA switch interface is not under a bridge, DSA still keeps it in the
"FORWARDING" STP state. And when that interface joins a bridge, the
bridge will meticulously iterate that port through all STP states,
starting with BLOCKING and ending with FORWARDING. Because there is a
state transition from the standalone version of FORWARDING into the
temporary BLOCKING bridge port state, DSA calls the fast age procedure.

Since commit 5e38c15856 ("net: dsa: configure better brport flags when
ports leave the bridge"), DSA asks standalone ports to disable address
learning. Therefore, there can be no dynamic FDB entries on a standalone
port. Therefore, it does not make sense to flush dynamic FDB entries on
one.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean 2021-08-08 14:16:37 +03:00 коммит произвёл David S. Miller
Родитель f9be84db09
Коммит 39f3210154
3 изменённых файлов: 14 добавлений и 10 удалений
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2
net/dsa/dsa_priv.h
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@ -199,7 +199,7 @@ static inline struct net_device *dsa_master_find_slave(struct net_device *dev,
/* port.c */
void dsa_port_set_tag_protocol(struct dsa_port *cpu_dp,
const struct dsa_device_ops *tag_ops);
int dsa_port_set_state(struct dsa_port *dp, u8 state);
int dsa_port_set_state(struct dsa_port *dp, u8 state, bool do_fast_age);
int dsa_port_enable_rt(struct dsa_port *dp, struct phy_device *phy);
int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy);
void dsa_port_disable_rt(struct dsa_port *dp);

20
net/dsa/port.c
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@ -30,7 +30,7 @@ static int dsa_port_notify(const struct dsa_port *dp, unsigned long e, void *v)
return dsa_tree_notify(dp->ds->dst, e, v);
}
int dsa_port_set_state(struct dsa_port *dp, u8 state)
int dsa_port_set_state(struct dsa_port *dp, u8 state, bool do_fast_age)
{
struct dsa_switch *ds = dp->ds;
int port = dp->index;
@ -40,10 +40,13 @@ int dsa_port_set_state(struct dsa_port *dp, u8 state)
ds->ops->port_stp_state_set(ds, port, state);
if (ds->ops->port_fast_age) {
if (do_fast_age && ds->ops->port_fast_age) {
/* Fast age FDB entries or flush appropriate forwarding database
* for the given port, if we are moving it from Learning or
* Forwarding state, to Disabled or Blocking or Listening state.
* Ports that were standalone before the STP state change don't
* need to fast age the FDB, since address learning is off in
* standalone mode.
*/
if ((dp->stp_state == BR_STATE_LEARNING ||
@ -59,11 +62,12 @@ int dsa_port_set_state(struct dsa_port *dp, u8 state)
return 0;
}
static void dsa_port_set_state_now(struct dsa_port *dp, u8 state)
static void dsa_port_set_state_now(struct dsa_port *dp, u8 state,
bool do_fast_age)
{
int err;
err = dsa_port_set_state(dp, state);
err = dsa_port_set_state(dp, state, do_fast_age);
if (err)
pr_err("DSA: failed to set STP state %u (%d)\n", state, err);
}
@ -81,7 +85,7 @@ int dsa_port_enable_rt(struct dsa_port *dp, struct phy_device *phy)
}
if (!dp->bridge_dev)
dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
dsa_port_set_state_now(dp, BR_STATE_FORWARDING, false);
if (dp->pl)
phylink_start(dp->pl);
@ -109,7 +113,7 @@ void dsa_port_disable_rt(struct dsa_port *dp)
phylink_stop(dp->pl);
if (!dp->bridge_dev)
dsa_port_set_state_now(dp, BR_STATE_DISABLED);
dsa_port_set_state_now(dp, BR_STATE_DISABLED, false);
if (ds->ops->port_disable)
ds->ops->port_disable(ds, port);
@ -178,7 +182,7 @@ static int dsa_port_switchdev_sync_attrs(struct dsa_port *dp,
if (err)
return err;
err = dsa_port_set_state(dp, br_port_get_stp_state(brport_dev));
err = dsa_port_set_state(dp, br_port_get_stp_state(brport_dev), false);
if (err && err != -EOPNOTSUPP)
return err;
@ -211,7 +215,7 @@ static void dsa_port_switchdev_unsync_attrs(struct dsa_port *dp)
/* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
* so allow it to be in BR_STATE_FORWARDING to be kept functional
*/
dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
dsa_port_set_state_now(dp, BR_STATE_FORWARDING, true);
/* VLAN filtering is handled by dsa_switch_bridge_leave */

2
net/dsa/slave.c
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@ -286,7 +286,7 @@ static int dsa_slave_port_attr_set(struct net_device *dev, const void *ctx,
if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
return -EOPNOTSUPP;
ret = dsa_port_set_state(dp, attr->u.stp_state);
ret = dsa_port_set_state(dp, attr->u.stp_state, true);
break;
case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
if (!dsa_port_offloads_bridge(dp, attr->orig_dev))