/*
 * 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>

#include "dsa_priv.h"

int dsa_port_set_state(struct dsa_port *dp, u8 state,
		       struct switchdev_trans *trans)
{
	struct dsa_switch *ds = dp->ds;
	int port = dp->index;

	if (switchdev_trans_ph_prepare(trans))
		return ds->ops->port_stp_state_set ? 0 : -EOPNOTSUPP;

	if (ds->ops->port_stp_state_set)
		ds->ops->port_stp_state_set(ds, port, state);

	if (ds->ops->port_fast_age) {
		/* Fast age FDB entries or flush appropriate forwarding database
		 * for the given port, if we are moving it from Learning or
		 * Forwarding state, to Disabled or Blocking or Listening state.
		 */

		if ((dp->stp_state == BR_STATE_LEARNING ||
		     dp->stp_state == BR_STATE_FORWARDING) &&
		    (state == BR_STATE_DISABLED ||
		     state == BR_STATE_BLOCKING ||
		     state == BR_STATE_LISTENING))
			ds->ops->port_fast_age(ds, port);
	}

	dp->stp_state = state;

	return 0;
}

void dsa_port_set_state_now(struct dsa_port *dp, u8 state)
{
	int err;

	err = dsa_port_set_state(dp, state, NULL);
	if (err)
		pr_err("DSA: failed to set STP state %u (%d)\n", state, err);
}