From ea08eeccae9297f7aabd2ef7f0c2517ac4549acc Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:18:26 +0000
Subject: [PATCH] write in 30M

---
 kernel/net/dsa/port.c |  445 ++++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 files changed, 405 insertions(+), 40 deletions(-)

diff --git a/kernel/net/dsa/port.c b/kernel/net/dsa/port.c
index ea7efc8..c9d552c 100644
--- a/kernel/net/dsa/port.c
+++ b/kernel/net/dsa/port.c
@@ -1,13 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Handling of a single switch port
  *
  * Copyright (c) 2017 Savoir-faire Linux Inc.
  *	Vivien Didelot <vivien.didelot@savoirfairelinux.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
  */
 
 #include <linux/if_bridge.h>
@@ -16,6 +12,23 @@
 #include <linux/of_net.h>
 
 #include "dsa_priv.h"
+
+static int dsa_broadcast(unsigned long e, void *v)
+{
+	struct dsa_switch_tree *dst;
+	int err = 0;
+
+	list_for_each_entry(dst, &dsa_tree_list, list) {
+		struct raw_notifier_head *nh = &dst->nh;
+
+		err = raw_notifier_call_chain(nh, e, v);
+		err = notifier_to_errno(err);
+		if (err)
+			break;
+	}
+
+	return err;
+}
 
 static int dsa_port_notify(const struct dsa_port *dp, unsigned long e, void *v)
 {
@@ -67,7 +80,7 @@
 		pr_err("DSA: failed to set STP state %u (%d)\n", state, err);
 }
 
-int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy)
+int dsa_port_enable_rt(struct dsa_port *dp, struct phy_device *phy)
 {
 	struct dsa_switch *ds = dp->ds;
 	int port = dp->index;
@@ -82,40 +95,72 @@
 	if (!dp->bridge_dev)
 		dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
 
+	if (dp->pl)
+		phylink_start(dp->pl);
+
 	return 0;
 }
 
-void dsa_port_disable(struct dsa_port *dp, struct phy_device *phy)
+int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy)
+{
+	int err;
+
+	rtnl_lock();
+	err = dsa_port_enable_rt(dp, phy);
+	rtnl_unlock();
+
+	return err;
+}
+
+void dsa_port_disable_rt(struct dsa_port *dp)
 {
 	struct dsa_switch *ds = dp->ds;
 	int port = dp->index;
+
+	if (dp->pl)
+		phylink_stop(dp->pl);
 
 	if (!dp->bridge_dev)
 		dsa_port_set_state_now(dp, BR_STATE_DISABLED);
 
 	if (ds->ops->port_disable)
-		ds->ops->port_disable(ds, port, phy);
+		ds->ops->port_disable(ds, port);
+}
+
+void dsa_port_disable(struct dsa_port *dp)
+{
+	rtnl_lock();
+	dsa_port_disable_rt(dp);
+	rtnl_unlock();
 }
 
 int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br)
 {
 	struct dsa_notifier_bridge_info info = {
+		.tree_index = dp->ds->dst->index,
 		.sw_index = dp->ds->index,
 		.port = dp->index,
 		.br = br,
 	};
 	int err;
 
-	/* Here the port is already bridged. Reflect the current configuration
-	 * so that drivers can program their chips accordingly.
+	/* Set the flooding mode before joining the port in the switch */
+	err = dsa_port_bridge_flags(dp, BR_FLOOD | BR_MCAST_FLOOD, NULL);
+	if (err)
+		return err;
+
+	/* Here the interface is already bridged. Reflect the current
+	 * configuration so that drivers can program their chips accordingly.
 	 */
 	dp->bridge_dev = br;
 
-	err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_JOIN, &info);
+	err = dsa_broadcast(DSA_NOTIFIER_BRIDGE_JOIN, &info);
 
 	/* The bridging is rolled back on error */
-	if (err)
+	if (err) {
+		dsa_port_bridge_flags(dp, 0, NULL);
 		dp->bridge_dev = NULL;
+	}
 
 	return err;
 }
@@ -123,6 +168,7 @@
 void dsa_port_bridge_leave(struct dsa_port *dp, struct net_device *br)
 {
 	struct dsa_notifier_bridge_info info = {
+		.tree_index = dp->ds->dst->index,
 		.sw_index = dp->ds->index,
 		.port = dp->index,
 		.br = br,
@@ -134,9 +180,12 @@
 	 */
 	dp->bridge_dev = NULL;
 
-	err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_LEAVE, &info);
+	err = dsa_broadcast(DSA_NOTIFIER_BRIDGE_LEAVE, &info);
 	if (err)
 		pr_err("DSA: failed to notify DSA_NOTIFIER_BRIDGE_LEAVE\n");
+
+	/* Port is leaving the bridge, disable flooding */
+	dsa_port_bridge_flags(dp, 0, NULL);
 
 	/* 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
@@ -144,20 +193,125 @@
 	dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
 }
 
+/* Must be called under rcu_read_lock() */
+static bool dsa_port_can_apply_vlan_filtering(struct dsa_port *dp,
+					      bool vlan_filtering)
+{
+	struct dsa_switch *ds = dp->ds;
+	int err, i;
+
+	/* VLAN awareness was off, so the question is "can we turn it on".
+	 * We may have had 8021q uppers, those need to go. Make sure we don't
+	 * enter an inconsistent state: deny changing the VLAN awareness state
+	 * as long as we have 8021q uppers.
+	 */
+	if (vlan_filtering && dsa_is_user_port(ds, dp->index)) {
+		struct net_device *upper_dev, *slave = dp->slave;
+		struct net_device *br = dp->bridge_dev;
+		struct list_head *iter;
+
+		netdev_for_each_upper_dev_rcu(slave, upper_dev, iter) {
+			struct bridge_vlan_info br_info;
+			u16 vid;
+
+			if (!is_vlan_dev(upper_dev))
+				continue;
+
+			vid = vlan_dev_vlan_id(upper_dev);
+
+			/* br_vlan_get_info() returns -EINVAL or -ENOENT if the
+			 * device, respectively the VID is not found, returning
+			 * 0 means success, which is a failure for us here.
+			 */
+			err = br_vlan_get_info(br, vid, &br_info);
+			if (err == 0) {
+				dev_err(ds->dev, "Must remove upper %s first\n",
+					upper_dev->name);
+				return false;
+			}
+		}
+	}
+
+	if (!ds->vlan_filtering_is_global)
+		return true;
+
+	/* For cases where enabling/disabling VLAN awareness is global to the
+	 * switch, we need to handle the case where multiple bridges span
+	 * different ports of the same switch device and one of them has a
+	 * different setting than what is being requested.
+	 */
+	for (i = 0; i < ds->num_ports; i++) {
+		struct net_device *other_bridge;
+
+		other_bridge = dsa_to_port(ds, i)->bridge_dev;
+		if (!other_bridge)
+			continue;
+		/* If it's the same bridge, it also has same
+		 * vlan_filtering setting => no need to check
+		 */
+		if (other_bridge == dp->bridge_dev)
+			continue;
+		if (br_vlan_enabled(other_bridge) != vlan_filtering) {
+			dev_err(ds->dev, "VLAN filtering is a global setting\n");
+			return false;
+		}
+	}
+	return true;
+}
+
 int dsa_port_vlan_filtering(struct dsa_port *dp, bool vlan_filtering,
 			    struct switchdev_trans *trans)
 {
 	struct dsa_switch *ds = dp->ds;
+	int err;
 
-	/* bridge skips -EOPNOTSUPP, so skip the prepare phase */
-	if (switchdev_trans_ph_prepare(trans))
+	if (switchdev_trans_ph_prepare(trans)) {
+		bool apply;
+
+		if (!ds->ops->port_vlan_filtering)
+			return -EOPNOTSUPP;
+
+		/* We are called from dsa_slave_switchdev_blocking_event(),
+		 * which is not under rcu_read_lock(), unlike
+		 * dsa_slave_switchdev_event().
+		 */
+		rcu_read_lock();
+		apply = dsa_port_can_apply_vlan_filtering(dp, vlan_filtering);
+		rcu_read_unlock();
+		if (!apply)
+			return -EINVAL;
+	}
+
+	if (dsa_port_is_vlan_filtering(dp) == vlan_filtering)
 		return 0;
 
-	if (ds->ops->port_vlan_filtering)
-		return ds->ops->port_vlan_filtering(ds, dp->index,
-						    vlan_filtering);
+	err = ds->ops->port_vlan_filtering(ds, dp->index, vlan_filtering,
+					   trans);
+	if (err)
+		return err;
+
+	if (switchdev_trans_ph_commit(trans)) {
+		if (ds->vlan_filtering_is_global)
+			ds->vlan_filtering = vlan_filtering;
+		else
+			dp->vlan_filtering = vlan_filtering;
+	}
 
 	return 0;
+}
+
+/* This enforces legacy behavior for switch drivers which assume they can't
+ * receive VLAN configuration when enslaved to a bridge with vlan_filtering=0
+ */
+bool dsa_port_skip_vlan_configuration(struct dsa_port *dp)
+{
+	struct dsa_switch *ds = dp->ds;
+
+	if (!dp->bridge_dev)
+		return false;
+
+	return (!ds->configure_vlan_while_not_filtering &&
+		!br_vlan_enabled(dp->bridge_dev));
 }
 
 int dsa_port_ageing_time(struct dsa_port *dp, clock_t ageing_clock,
@@ -176,6 +330,60 @@
 	dp->ageing_time = ageing_time;
 
 	return dsa_port_notify(dp, DSA_NOTIFIER_AGEING_TIME, &info);
+}
+
+int dsa_port_pre_bridge_flags(const struct dsa_port *dp, unsigned long flags,
+			      struct switchdev_trans *trans)
+{
+	struct dsa_switch *ds = dp->ds;
+
+	if (!ds->ops->port_egress_floods ||
+	    (flags & ~(BR_FLOOD | BR_MCAST_FLOOD)))
+		return -EINVAL;
+
+	return 0;
+}
+
+int dsa_port_bridge_flags(const struct dsa_port *dp, unsigned long flags,
+			  struct switchdev_trans *trans)
+{
+	struct dsa_switch *ds = dp->ds;
+	int port = dp->index;
+	int err = 0;
+
+	if (switchdev_trans_ph_prepare(trans))
+		return 0;
+
+	if (ds->ops->port_egress_floods)
+		err = ds->ops->port_egress_floods(ds, port, flags & BR_FLOOD,
+						  flags & BR_MCAST_FLOOD);
+
+	return err;
+}
+
+int dsa_port_mrouter(struct dsa_port *dp, bool mrouter,
+		     struct switchdev_trans *trans)
+{
+	struct dsa_switch *ds = dp->ds;
+	int port = dp->index;
+
+	if (switchdev_trans_ph_prepare(trans))
+		return ds->ops->port_egress_floods ? 0 : -EOPNOTSUPP;
+
+	return ds->ops->port_egress_floods(ds, port, true, mrouter);
+}
+
+int dsa_port_mtu_change(struct dsa_port *dp, int new_mtu,
+			bool propagate_upstream)
+{
+	struct dsa_notifier_mtu_info info = {
+		.sw_index = dp->ds->index,
+		.propagate_upstream = propagate_upstream,
+		.port = dp->index,
+		.mtu = new_mtu,
+	};
+
+	return dsa_port_notify(dp, DSA_NOTIFIER_MTU, &info);
 }
 
 int dsa_port_fdb_add(struct dsa_port *dp, const unsigned char *addr,
@@ -253,13 +461,7 @@
 		.vlan = vlan,
 	};
 
-	if (netif_is_bridge_master(vlan->obj.orig_dev))
-		return -EOPNOTSUPP;
-
-	if (br_vlan_enabled(dp->bridge_dev))
-		return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_ADD, &info);
-
-	return 0;
+	return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_ADD, &info);
 }
 
 int dsa_port_vlan_del(struct dsa_port *dp,
@@ -271,13 +473,7 @@
 		.vlan = vlan,
 	};
 
-	if (netif_is_bridge_master(vlan->obj.orig_dev))
-		return -EOPNOTSUPP;
-
-	if (br_vlan_enabled(dp->bridge_dev))
-		return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_DEL, &info);
-
-	return 0;
+	return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_DEL, &info);
 }
 
 static struct phy_device *dsa_port_get_phy_device(struct dsa_port *dp)
@@ -295,8 +491,116 @@
 		return ERR_PTR(-EPROBE_DEFER);
 	}
 
+	of_node_put(phy_dn);
 	return phydev;
 }
+
+static void dsa_port_phylink_validate(struct phylink_config *config,
+				      unsigned long *supported,
+				      struct phylink_link_state *state)
+{
+	struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
+	struct dsa_switch *ds = dp->ds;
+
+	if (!ds->ops->phylink_validate)
+		return;
+
+	ds->ops->phylink_validate(ds, dp->index, supported, state);
+}
+
+static void dsa_port_phylink_mac_pcs_get_state(struct phylink_config *config,
+					       struct phylink_link_state *state)
+{
+	struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
+	struct dsa_switch *ds = dp->ds;
+	int err;
+
+	/* Only called for inband modes */
+	if (!ds->ops->phylink_mac_link_state) {
+		state->link = 0;
+		return;
+	}
+
+	err = ds->ops->phylink_mac_link_state(ds, dp->index, state);
+	if (err < 0) {
+		dev_err(ds->dev, "p%d: phylink_mac_link_state() failed: %d\n",
+			dp->index, err);
+		state->link = 0;
+	}
+}
+
+static void dsa_port_phylink_mac_config(struct phylink_config *config,
+					unsigned int mode,
+					const struct phylink_link_state *state)
+{
+	struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
+	struct dsa_switch *ds = dp->ds;
+
+	if (!ds->ops->phylink_mac_config)
+		return;
+
+	ds->ops->phylink_mac_config(ds, dp->index, mode, state);
+}
+
+static void dsa_port_phylink_mac_an_restart(struct phylink_config *config)
+{
+	struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
+	struct dsa_switch *ds = dp->ds;
+
+	if (!ds->ops->phylink_mac_an_restart)
+		return;
+
+	ds->ops->phylink_mac_an_restart(ds, dp->index);
+}
+
+static void dsa_port_phylink_mac_link_down(struct phylink_config *config,
+					   unsigned int mode,
+					   phy_interface_t interface)
+{
+	struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
+	struct phy_device *phydev = NULL;
+	struct dsa_switch *ds = dp->ds;
+
+	if (dsa_is_user_port(ds, dp->index))
+		phydev = dp->slave->phydev;
+
+	if (!ds->ops->phylink_mac_link_down) {
+		if (ds->ops->adjust_link && phydev)
+			ds->ops->adjust_link(ds, dp->index, phydev);
+		return;
+	}
+
+	ds->ops->phylink_mac_link_down(ds, dp->index, mode, interface);
+}
+
+static void dsa_port_phylink_mac_link_up(struct phylink_config *config,
+					 struct phy_device *phydev,
+					 unsigned int mode,
+					 phy_interface_t interface,
+					 int speed, int duplex,
+					 bool tx_pause, bool rx_pause)
+{
+	struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
+	struct dsa_switch *ds = dp->ds;
+
+	if (!ds->ops->phylink_mac_link_up) {
+		if (ds->ops->adjust_link && phydev)
+			ds->ops->adjust_link(ds, dp->index, phydev);
+		return;
+	}
+
+	ds->ops->phylink_mac_link_up(ds, dp->index, mode, interface, phydev,
+				     speed, duplex, tx_pause, rx_pause);
+}
+
+const struct phylink_mac_ops dsa_port_phylink_mac_ops = {
+	.validate = dsa_port_phylink_validate,
+	.mac_pcs_get_state = dsa_port_phylink_mac_pcs_get_state,
+	.mac_config = dsa_port_phylink_mac_config,
+	.mac_an_restart = dsa_port_phylink_mac_an_restart,
+	.mac_link_down = dsa_port_phylink_mac_link_down,
+	.mac_link_up = dsa_port_phylink_mac_link_up,
+};
 
 static int dsa_port_setup_phy_of(struct dsa_port *dp, bool enable)
 {
@@ -313,10 +617,6 @@
 		return PTR_ERR(phydev);
 
 	if (enable) {
-		err = genphy_config_init(phydev);
-		if (err < 0)
-			goto err_put_dev;
-
 		err = genphy_resume(phydev);
 		if (err < 0)
 			goto err_put_dev;
@@ -346,7 +646,7 @@
 	struct dsa_switch *ds = dp->ds;
 	struct phy_device *phydev;
 	int port = dp->index;
-	int mode;
+	phy_interface_t mode;
 	int err;
 
 	err = of_phy_register_fixed_link(dn);
@@ -359,12 +659,11 @@
 
 	phydev = of_phy_find_device(dn);
 
-	mode = of_get_phy_mode(dn);
-	if (mode < 0)
+	err = of_get_phy_mode(dn, &mode);
+	if (err)
 		mode = PHY_INTERFACE_MODE_NA;
 	phydev->interface = mode;
 
-	genphy_config_init(phydev);
 	genphy_read_status(phydev);
 
 	if (ds->ops->adjust_link)
@@ -375,8 +674,63 @@
 	return 0;
 }
 
+static int dsa_port_phylink_register(struct dsa_port *dp)
+{
+	struct dsa_switch *ds = dp->ds;
+	struct device_node *port_dn = dp->dn;
+	phy_interface_t mode;
+	int err;
+
+	err = of_get_phy_mode(port_dn, &mode);
+	if (err)
+		mode = PHY_INTERFACE_MODE_NA;
+
+	dp->pl_config.dev = ds->dev;
+	dp->pl_config.type = PHYLINK_DEV;
+	dp->pl_config.pcs_poll = ds->pcs_poll;
+
+	dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn),
+				mode, &dsa_port_phylink_mac_ops);
+	if (IS_ERR(dp->pl)) {
+		pr_err("error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
+		return PTR_ERR(dp->pl);
+	}
+
+	err = phylink_of_phy_connect(dp->pl, port_dn, 0);
+	if (err && err != -ENODEV) {
+		pr_err("could not attach to PHY: %d\n", err);
+		goto err_phy_connect;
+	}
+
+	return 0;
+
+err_phy_connect:
+	phylink_destroy(dp->pl);
+	return err;
+}
+
 int dsa_port_link_register_of(struct dsa_port *dp)
 {
+	struct dsa_switch *ds = dp->ds;
+	struct device_node *phy_np;
+	int port = dp->index;
+
+	if (!ds->ops->adjust_link) {
+		phy_np = of_parse_phandle(dp->dn, "phy-handle", 0);
+		if (of_phy_is_fixed_link(dp->dn) || phy_np) {
+			if (ds->ops->phylink_mac_link_down)
+				ds->ops->phylink_mac_link_down(ds, port,
+					MLO_AN_FIXED, PHY_INTERFACE_MODE_NA);
+			of_node_put(phy_np);
+			return dsa_port_phylink_register(dp);
+		}
+		of_node_put(phy_np);
+		return 0;
+	}
+
+	dev_warn(ds->dev,
+		 "Using legacy PHYLIB callbacks. Please migrate to PHYLINK!\n");
+
 	if (of_phy_is_fixed_link(dp->dn))
 		return dsa_port_fixed_link_register_of(dp);
 	else
@@ -385,6 +739,17 @@
 
 void dsa_port_link_unregister_of(struct dsa_port *dp)
 {
+	struct dsa_switch *ds = dp->ds;
+
+	if (!ds->ops->adjust_link && dp->pl) {
+		rtnl_lock();
+		phylink_disconnect_phy(dp->pl);
+		rtnl_unlock();
+		phylink_destroy(dp->pl);
+		dp->pl = NULL;
+		return;
+	}
+
 	if (of_phy_is_fixed_link(dp->dn))
 		of_phy_deregister_fixed_link(dp->dn);
 	else

--
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