generic: 5.15: qca8k: add kernel version tag on backport patch

Add kernel tag that introduced the patch on backport patch.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

1 files changed, 67 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.15/766-v5.18-09-net-dsa-qca8k-add-tracking-state-of-master-port.patch b/target/linux/generic/backport-5.15/766-v5.18-09-net-dsa-qca8k-add-tracking-state-of-master-port.patch
new file mode 100644
index 0000000000..eb21cc3912
--- /dev/null
+++ b/target/linux/generic/backport-5.15/766-v5.18-09-net-dsa-qca8k-add-tracking-state-of-master-port.patch
@@ -0,0 +1,67 @@
+From cddbec19466a1dfb4d45ddd507d9f09f991d54ae Mon Sep 17 00:00:00 2001
+From: Ansuel Smith <ansuelsmth@gmail.com>
+Date: Wed, 2 Feb 2022 01:03:28 +0100
+Subject: [PATCH 09/16] net: dsa: qca8k: add tracking state of master port
+
+MDIO/MIB Ethernet require the master port and the tagger availabale to
+correctly work. Use the new api master_state_change to track when master
+is operational or not and set a bool in qca8k_priv.
+We cache the first cached master available and we check if other cpu
+port are operational when the cached one goes down.
+This cached master will later be used by mdio read/write and mib request to
+correctly use the working function.
+
+qca8k implementation for MDIO/MIB Ethernet is bad. CPU port0 is the only
+one that answers with the ack packet or sends MIB Ethernet packets. For
+this reason the master_state_change ignore CPU port6 and only checks
+CPU port0 if it's operational and enables this mode.
+
+Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
+Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/dsa/qca8k.c | 15 +++++++++++++++
+ drivers/net/dsa/qca8k.h |  1 +
+ 2 files changed, 16 insertions(+)
+
+--- a/drivers/net/dsa/qca8k.c
++++ b/drivers/net/dsa/qca8k.c
+@@ -2401,6 +2401,20 @@ qca8k_port_lag_leave(struct dsa_switch *
+ 	return qca8k_lag_refresh_portmap(ds, port, lag, true);
+ }
+ 
++static void
++qca8k_master_change(struct dsa_switch *ds, const struct net_device *master,
++		    bool operational)
++{
++	struct dsa_port *dp = master->dsa_ptr;
++	struct qca8k_priv *priv = ds->priv;
++
++	/* Ethernet MIB/MDIO is only supported for CPU port 0 */
++	if (dp->index != 0)
++		return;
++
++	priv->mgmt_master = operational ? (struct net_device *)master : NULL;
++}
++
+ static const struct dsa_switch_ops qca8k_switch_ops = {
+ 	.get_tag_protocol	= qca8k_get_tag_protocol,
+ 	.setup			= qca8k_setup,
+@@ -2436,6 +2450,7 @@ static const struct dsa_switch_ops qca8k
+ 	.get_phy_flags		= qca8k_get_phy_flags,
+ 	.port_lag_join		= qca8k_port_lag_join,
+ 	.port_lag_leave		= qca8k_port_lag_leave,
++	.master_state_change	= qca8k_master_change,
+ };
+ 
+ static int qca8k_read_switch_id(struct qca8k_priv *priv)
+--- a/drivers/net/dsa/qca8k.h
++++ b/drivers/net/dsa/qca8k.h
+@@ -353,6 +353,7 @@ struct qca8k_priv {
+ 	struct dsa_switch_ops ops;
+ 	struct gpio_desc *reset_gpio;
+ 	unsigned int port_mtu[QCA8K_NUM_PORTS];
++	struct net_device *mgmt_master; /* Track if mdio/mib Ethernet is available */
+ };
+ 
+ struct qca8k_mib_desc {