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Merge branch 'Dynamic-toggling-of-vlan_filtering-for-SJA1105-DSA'

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Vladimir Oltean says:

====================
Dynamic toggling of vlan_filtering for SJA1105 DSA

This patchset addresses a limitation in dsa_8021q where this sequence of
commands was causing the switch to stop forwarding traffic:

  ip link add name br0 type bridge vlan_filtering 0
  ip link set dev swp2 master br0
  echo 1 > /sys/class/net/br0/bridge/vlan_filtering
  echo 0 > /sys/class/net/br0/bridge/vlan_filtering

The issue has to do with the VLAN table manipulations that dsa_8021q
does without notifying the bridge layer. The solution is to always
restore the VLANs that the bridge knows about, when disabling tagging.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2019-08-31 13:21:19 -07:00
commit b0274eb0d7
2 changed files with 84 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
net/bridge/br_vlan.c
View File

@ -1281,6 +1281,8 @@ int br_vlan_get_info(const struct net_device *dev, u16 vid,
p_vinfo->vid = vid;
p_vinfo->flags = v->flags;
if (vid == br_get_pvid(vg))
p_vinfo->flags |= BRIDGE_VLAN_INFO_PVID;
return 0;
}
EXPORT_SYMBOL_GPL(br_vlan_get_info);

102
net/dsa/tag_8021q.c
View File

@ -91,6 +91,79 @@ int dsa_8021q_rx_source_port(u16 vid)
}
EXPORT_SYMBOL_GPL(dsa_8021q_rx_source_port);
static int dsa_8021q_restore_pvid(struct dsa_switch *ds, int port)
{
struct bridge_vlan_info vinfo;
struct net_device *slave;
u16 pvid;
int err;
if (!dsa_is_user_port(ds, port))
return 0;
slave = ds->ports[port].slave;
err = br_vlan_get_pvid(slave, &pvid);
if (err < 0)
/* There is no pvid on the bridge for this port, which is
* perfectly valid. Nothing to restore, bye-bye!
*/
return 0;
err = br_vlan_get_info(slave, pvid, &vinfo);
if (err < 0) {
dev_err(ds->dev, "Couldn't determine PVID attributes\n");
return err;
}
return dsa_port_vid_add(&ds->ports[port], pvid, vinfo.flags);
}
/* If @enabled is true, installs @vid with @flags into the switch port's HW
* filter.
* If @enabled is false, deletes @vid (ignores @flags) from the port. Had the
* user explicitly configured this @vid through the bridge core, then the @vid
* is installed again, but this time with the flags from the bridge layer.
*/
static int dsa_8021q_vid_apply(struct dsa_switch *ds, int port, u16 vid,
u16 flags, bool enabled)
{
struct dsa_port *dp = &ds->ports[port];
struct bridge_vlan_info vinfo;
int err;
if (enabled)
return dsa_port_vid_add(dp, vid, flags);
err = dsa_port_vid_del(dp, vid);
if (err < 0)
return err;
/* Nothing to restore from the bridge for a non-user port.
* The CPU port VLANs are restored implicitly with the user ports,
* similar to how the bridge does in dsa_slave_vlan_add and
* dsa_slave_vlan_del.
*/
if (!dsa_is_user_port(ds, port))
return 0;
err = br_vlan_get_info(dp->slave, vid, &vinfo);
/* Couldn't determine bridge attributes for this vid,
* it means the bridge had not configured it.
*/
if (err < 0)
return 0;
/* Restore the VID from the bridge */
err = dsa_port_vid_add(dp, vid, vinfo.flags);
if (err < 0)
return err;
vinfo.flags &= ~BRIDGE_VLAN_INFO_PVID;
return dsa_port_vid_add(dp->cpu_dp, vid, vinfo.flags);
}
/* RX VLAN tagging (left) and TX VLAN tagging (right) setup shown for a single
* front-panel switch port (here swp0).
*
@ -146,8 +219,6 @@ EXPORT_SYMBOL_GPL(dsa_8021q_rx_source_port);
int dsa_port_setup_8021q_tagging(struct dsa_switch *ds, int port, bool enabled)
{
int upstream = dsa_upstream_port(ds, port);
struct dsa_port *dp = &ds->ports[port];
struct dsa_port *upstream_dp = &ds->ports[upstream];
u16 rx_vid = dsa_8021q_rx_vid(ds, port);
u16 tx_vid = dsa_8021q_tx_vid(ds, port);
int i, err;
@ -164,7 +235,6 @@ int dsa_port_setup_8021q_tagging(struct dsa_switch *ds, int port, bool enabled)
* restrictions, so there are no concerns about leaking traffic.
*/
for (i = 0; i < ds->num_ports; i++) {
struct dsa_port *other_dp = &ds->ports[i];
u16 flags;
if (i == upstream)
@ -177,10 +247,7 @@ int dsa_port_setup_8021q_tagging(struct dsa_switch *ds, int port, bool enabled)
/* The RX VID is a regular VLAN on all others */
flags = BRIDGE_VLAN_INFO_UNTAGGED;
if (enabled)
err = dsa_port_vid_add(other_dp, rx_vid, flags);
else
err = dsa_port_vid_del(other_dp, rx_vid);
err = dsa_8021q_vid_apply(ds, i, rx_vid, flags, enabled);
if (err) {
dev_err(ds->dev, "Failed to apply RX VID %d to port %d: %d\n",
rx_vid, port, err);
@ -191,10 +258,7 @@ int dsa_port_setup_8021q_tagging(struct dsa_switch *ds, int port, bool enabled)
/* CPU port needs to see this port's RX VID
* as tagged egress.
*/
if (enabled)
err = dsa_port_vid_add(upstream_dp, rx_vid, 0);
else
err = dsa_port_vid_del(upstream_dp, rx_vid);
err = dsa_8021q_vid_apply(ds, upstream, rx_vid, 0, enabled);
if (err) {
dev_err(ds->dev, "Failed to apply RX VID %d to port %d: %d\n",
rx_vid, port, err);
@ -202,26 +266,24 @@ int dsa_port_setup_8021q_tagging(struct dsa_switch *ds, int port, bool enabled)
}
/* Finally apply the TX VID on this port and on the CPU port */
if (enabled)
err = dsa_port_vid_add(dp, tx_vid, BRIDGE_VLAN_INFO_UNTAGGED);
else
err = dsa_port_vid_del(dp, tx_vid);
err = dsa_8021q_vid_apply(ds, port, tx_vid, BRIDGE_VLAN_INFO_UNTAGGED,
enabled);
if (err) {
dev_err(ds->dev, "Failed to apply TX VID %d on port %d: %d\n",
tx_vid, port, err);
return err;
}
if (enabled)
err = dsa_port_vid_add(upstream_dp, tx_vid, 0);
else
err = dsa_port_vid_del(upstream_dp, tx_vid);
err = dsa_8021q_vid_apply(ds, upstream, tx_vid, 0, enabled);
if (err) {
dev_err(ds->dev, "Failed to apply TX VID %d on port %d: %d\n",
tx_vid, upstream, err);
return err;
}
return 0;
if (!enabled)
err = dsa_8021q_restore_pvid(ds, port);
return err;
}
EXPORT_SYMBOL_GPL(dsa_port_setup_8021q_tagging);