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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/net/bridge/br_stp.c
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@@ -1,14 +1,10 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  *	Spanning tree protocol; generic parts
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  *	Linux ethernet bridge
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  *
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  *	Authors:
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  *	Lennert Buytenhek		<buytenh@gnu.org>
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- *
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- *	This program is free software; you can redistribute it and/or
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- *	modify it under the terms of the GNU General Public License
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- *	as published by the Free Software Foundation; either version
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- *	2 of the License, or (at your option) any later version.
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  */
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 #include <linux/kernel.h>
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 #include <linux/rculist.h>
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@@ -40,6 +36,12 @@
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 	};
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 	int err;
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+	/* Don't change the state of the ports if they are driven by a different
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+	 * protocol.
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+	 */
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+	if (p->flags & BR_MRP_AWARE)
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+		return;
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+
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 	p->state = state;
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 	err = switchdev_port_attr_set(p->dev, &attr);
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 	if (err && err != -EOPNOTSUPP)
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@@ -49,6 +51,17 @@
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 		br_info(p->br, "port %u(%s) entered %s state\n",
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 				(unsigned int) p->port_no, p->dev->name,
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 				br_port_state_names[p->state]);
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+
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+	if (p->br->stp_enabled == BR_KERNEL_STP) {
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+		switch (p->state) {
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+		case BR_STATE_BLOCKING:
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+			p->stp_xstats.transition_blk++;
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+			break;
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+		case BR_STATE_FORWARDING:
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+			p->stp_xstats.transition_fwd++;
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+			break;
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+		}
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+	}
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 }
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 /* called under bridge lock */
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@@ -56,7 +69,8 @@
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 {
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 	struct net_bridge_port *p;
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-	list_for_each_entry_rcu(p, &br->port_list, list) {
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+	list_for_each_entry_rcu(p, &br->port_list, list,
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+				lockdep_is_held(&br->lock)) {
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 		if (p->port_no == port_no)
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 			return p;
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 	}
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@@ -488,6 +502,8 @@
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 	struct net_bridge *br;
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 	int was_root;
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+	p->stp_xstats.rx_bpdu++;
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+
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 	br = p->br;
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 	was_root = br_is_root_bridge(br);
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@@ -521,6 +537,8 @@
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 /* called under bridge lock */
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 void br_received_tcn_bpdu(struct net_bridge_port *p)
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 {
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+	p->stp_xstats.rx_tcn++;
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+
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 	if (br_is_designated_port(p)) {
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 		br_info(p->br, "port %u(%s) received tcn bpdu\n",
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 			(unsigned int) p->port_no, p->dev->name);