generic: 5.15: backport mdio improvement patch for qca8k

Backport qca8k mdio improvement patch merged upstream,
where we use eth packet when available to send mdio commands.

This should improve speed and cause less load on the CPU.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>

1 files changed, 123 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.15/765-5-net-next-net-dsa-first-set-up-shared-ports-then-non-shared-po.patch b/target/linux/generic/backport-5.15/765-5-net-next-net-dsa-first-set-up-shared-ports-then-non-shared-po.patch
new file mode 100644
index 00000000000..fbd63a57430
--- /dev/null
+++ b/target/linux/generic/backport-5.15/765-5-net-next-net-dsa-first-set-up-shared-ports-then-non-shared-po.patch
@@ -0,0 +1,123 @@
+From 1e3f407f3cacc5dcfe27166c412ed9bc263d82bf Mon Sep 17 00:00:00 2001
+From: Vladimir Oltean <vladimir.oltean@nxp.com>
+Date: Thu, 6 Jan 2022 01:11:16 +0200
+Subject: [PATCH 5/6] net: dsa: first set up shared ports, then non-shared
+ ports
+
+After commit a57d8c217aad ("net: dsa: flush switchdev workqueue before
+tearing down CPU/DSA ports"), the port setup and teardown procedure
+became asymmetric.
+
+The fact of the matter is that user ports need the shared ports to be up
+before they can be used for CPU-initiated termination. And since we
+register net devices for the user ports, those won't be functional until
+we also call the setup for the shared (CPU, DSA) ports. But we may do
+that later, depending on the port numbering scheme of the hardware we
+are dealing with.
+
+It just makes sense that all shared ports are brought up before any user
+port is. I can't pinpoint any issue due to the current behavior, but
+let's change it nonetheless, for consistency's sake.
+
+Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ net/dsa/dsa2.c | 50 +++++++++++++++++++++++++++++++++++++-------------
+ 1 file changed, 37 insertions(+), 13 deletions(-)
+
+diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
+index 52fb1958b535..ea0f02a24b8b 100644
+--- a/net/dsa/dsa2.c
++++ b/net/dsa/dsa2.c
+@@ -1003,23 +1003,28 @@ static void dsa_tree_teardown_switches(struct dsa_switch_tree *dst)
+ 		dsa_switch_teardown(dp->ds);
+ }
+ 
+-static int dsa_tree_setup_switches(struct dsa_switch_tree *dst)
++/* Bring shared ports up first, then non-shared ports */
++static int dsa_tree_setup_ports(struct dsa_switch_tree *dst)
+ {
+ 	struct dsa_port *dp;
+-	int err;
++	int err = 0;
+ 
+ 	list_for_each_entry(dp, &dst->ports, list) {
+-		err = dsa_switch_setup(dp->ds);
+-		if (err)
+-			goto teardown;
++		if (dsa_port_is_dsa(dp) || dsa_port_is_cpu(dp)) {
++			err = dsa_port_setup(dp);
++			if (err)
++				goto teardown;
++		}
+ 	}
+ 
+ 	list_for_each_entry(dp, &dst->ports, list) {
+-		err = dsa_port_setup(dp);
+-		if (err) {
+-			err = dsa_port_reinit_as_unused(dp);
+-			if (err)
+-				goto teardown;
++		if (dsa_port_is_user(dp) || dsa_port_is_unused(dp)) {
++			err = dsa_port_setup(dp);
++			if (err) {
++				err = dsa_port_reinit_as_unused(dp);
++				if (err)
++					goto teardown;
++			}
+ 		}
+ 	}
+ 
+@@ -1028,7 +1033,21 @@ static int dsa_tree_setup_switches(struct dsa_switch_tree *dst)
+ teardown:
+ 	dsa_tree_teardown_ports(dst);
+ 
+-	dsa_tree_teardown_switches(dst);
++	return err;
++}
++
++static int dsa_tree_setup_switches(struct dsa_switch_tree *dst)
++{
++	struct dsa_port *dp;
++	int err = 0;
++
++	list_for_each_entry(dp, &dst->ports, list) {
++		err = dsa_switch_setup(dp->ds);
++		if (err) {
++			dsa_tree_teardown_switches(dst);
++			break;
++		}
++	}
+ 
+ 	return err;
+ }
+@@ -1115,10 +1134,14 @@ static int dsa_tree_setup(struct dsa_switch_tree *dst)
+ 	if (err)
+ 		goto teardown_cpu_ports;
+ 
+-	err = dsa_tree_setup_master(dst);
++	err = dsa_tree_setup_ports(dst);
+ 	if (err)
+ 		goto teardown_switches;
+ 
++	err = dsa_tree_setup_master(dst);
++	if (err)
++		goto teardown_ports;
++
+ 	err = dsa_tree_setup_lags(dst);
+ 	if (err)
+ 		goto teardown_master;
+@@ -1131,8 +1154,9 @@ static int dsa_tree_setup(struct dsa_switch_tree *dst)
+ 
+ teardown_master:
+ 	dsa_tree_teardown_master(dst);
+-teardown_switches:
++teardown_ports:
+ 	dsa_tree_teardown_ports(dst);
++teardown_switches:
+ 	dsa_tree_teardown_switches(dst);
+ teardown_cpu_ports:
+ 	dsa_tree_teardown_cpu_ports(dst);
+-- 
+2.34.1
+