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Subject[RFC PATCH net-next 4/4] net: ethernet: ti: cpsw: fix vlan configuration while down/up
Date
The vlan configuration is not restored after interface donw/up sequence
(if dual-emac - both interfaces). Tested on am572x EVM.

Steps to check:
~# ip link add link eth1 name eth1.100 type vlan id 100
~# ifconfig eth0 down
~# ifconfig eth1 down

This is TI sdk tool, dumping all ALE entries, see they are present
~# switch-config -d
~# ifconfig eth1 up
See entry for vid 100 is absent
~# switch-config -d

Try to remove vid and observe warning:
~# ip link del eth1.100
[ 739.526757] net eth1: removing vlanid 100 from vlan filter
[ 739.533322] failed to kill vid 0081/100 for device eth1

This patch fixes it, restoring only vlan ALE entries and all other
unicast/multicast entries are restored by system calling rx_mode ndo.

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
---
drivers/net/ethernet/ti/cpsw.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)

diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index 5967484619d4..0b28a90b62bb 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -565,6 +565,9 @@ static const struct cpsw_stats cpsw_gstrings_ch_stats[] = {
(func)(slave++, ##arg); \
} while (0)

+static int cpsw_ndo_vlan_rx_add_vid(struct net_device *ndev,
+ __be16 proto, u16 vid);
+
static inline int cpsw_get_slave_port(u32 slave_num)
{
return slave_num + 1;
@@ -1955,9 +1958,23 @@ static void cpsw_mqprio_resume(struct cpsw_slave *slave, struct cpsw_priv *priv)
slave_write(slave, tx_prio_map, tx_prio_rg);
}

+static int cpsw_restore_vlans(struct net_device *vdev, int vid, void *arg)
+{
+ struct cpsw_priv *priv = arg;
+
+ if (!vdev)
+ return 0;
+
+ cpsw_ndo_vlan_rx_add_vid(priv->ndev, 0, vid);
+ return 0;
+}
+
/* restore resources after port reset */
static void cpsw_restore(struct cpsw_priv *priv)
{
+ /* restore vlan configurations */
+ vlan_for_each(priv->ndev, cpsw_restore_vlans, priv);
+
/* restore MQPRIO offload */
for_each_slave(priv, cpsw_mqprio_resume, priv);

--
2.17.1
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