/*
 * Handling of a single switch chip, part of a switch fabric
 *
 * Copyright (c) 2017 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/netdevice.h>
#include <linux/notifier.h>
#include <net/dsa.h>

static int dsa_switch_bridge_join(struct dsa_switch *ds,
				  struct dsa_notifier_bridge_info *info)
{
	if (ds->index == info->sw_index && ds->ops->port_bridge_join)
		return ds->ops->port_bridge_join(ds, info->port, info->br);

	if (ds->index != info->sw_index)
		dev_dbg(ds->dev, "crosschip DSA port %d.%d bridged to %s\n",
			info->sw_index, info->port, netdev_name(info->br));

	return 0;
}

static int dsa_switch_bridge_leave(struct dsa_switch *ds,
				   struct dsa_notifier_bridge_info *info)
{
	if (ds->index == info->sw_index && ds->ops->port_bridge_leave)
		ds->ops->port_bridge_leave(ds, info->port, info->br);

	if (ds->index != info->sw_index)
		dev_dbg(ds->dev, "crosschip DSA port %d.%d unbridged from %s\n",
			info->sw_index, info->port, netdev_name(info->br));

	return 0;
}

static int dsa_switch_event(struct notifier_block *nb,
			    unsigned long event, void *info)
{
	struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb);
	int err;

	switch (event) {
	case DSA_NOTIFIER_BRIDGE_JOIN:
		err = dsa_switch_bridge_join(ds, info);
		break;
	case DSA_NOTIFIER_BRIDGE_LEAVE:
		err = dsa_switch_bridge_leave(ds, info);
		break;
	default:
		err = -EOPNOTSUPP;
		break;
	}

	/* Non-switchdev operations cannot be rolled back. If a DSA driver
	 * returns an error during the chained call, switch chips may be in an
	 * inconsistent state.
	 */
	if (err)
		dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n",
			event, err);

	return notifier_from_errno(err);
}

int dsa_switch_register_notifier(struct dsa_switch *ds)
{
	ds->nb.notifier_call = dsa_switch_event;

	return raw_notifier_chain_register(&ds->dst->nh, &ds->nb);
}

void dsa_switch_unregister_notifier(struct dsa_switch *ds)
{
	int err;

	err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb);
	if (err)
		dev_err(ds->dev, "failed to unregister notifier (%d)\n", err);
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?id=d1e7925e6d80ce5f9ef6deb8f3cec7526f5c443c'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/net?id=d1e7925e6d80ce5f9ef6deb8f3cec7526f5c443c'>net</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/sctp?id=d1e7925e6d80ce5f9ef6deb8f3cec7526f5c443c'>sctp</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/sctp/associola.c?id=d1e7925e6d80ce5f9ef6deb8f3cec7526f5c443c'>associola.c</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/net/sctp/associola.c?id=d1e7925e6d80ce5f9ef6deb8f3cec7526f5c443c&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
<tr><td><span title='2017-02-07 13:07:46 -0500'>2017-02-07</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/sctp/associola.c?id=c86a773c78025f5b825bacd7b846f4fa60dc0317'>sctp: add dst_pending_confirm flag</a></td><td>Julian Anastasov</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+1</span></td></tr>