[mirror_ubuntu-bionic-kernel.git] / net / dsa / switch.c

/*
 * Handling of a single switch chip, part of a switch fabric
 *
 * 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/netdevice.h>
#include <linux/notifier.h>
#include <net/switchdev.h>

#include "dsa_priv.h"

static unsigned int dsa_switch_fastest_ageing_time(struct dsa_switch *ds,
						   unsigned int ageing_time)
{
	int i;

	for (i = 0; i < ds->num_ports; ++i) {
		struct dsa_port *dp = &ds->ports[i];

		if (dp->ageing_time && dp->ageing_time < ageing_time)
			ageing_time = dp->ageing_time;
	}

	return ageing_time;
}

static int dsa_switch_ageing_time(struct dsa_switch *ds,
				  struct dsa_notifier_ageing_time_info *info)
{
	unsigned int ageing_time = info->ageing_time;
	struct switchdev_trans *trans = info->trans;

	if (switchdev_trans_ph_prepare(trans)) {
		if (ds->ageing_time_min && ageing_time < ds->ageing_time_min)
			return -ERANGE;
		if (ds->ageing_time_max && ageing_time > ds->ageing_time_max)
			return -ERANGE;
		return 0;
	}

	/* Program the fastest ageing time in case of multiple bridges */
	ageing_time = dsa_switch_fastest_ageing_time(ds, ageing_time);

	if (ds->ops->set_ageing_time)
		return ds->ops->set_ageing_time(ds, ageing_time);

	return 0;
}

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 && ds->ops->crosschip_bridge_join)
		return ds->ops->crosschip_bridge_join(ds, info->sw_index,
						      info->port, 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 && ds->ops->crosschip_bridge_leave)
		ds->ops->crosschip_bridge_leave(ds, info->sw_index, info->port,
						info->br);

	return 0;
}

static int dsa_switch_fdb_add(struct dsa_switch *ds,
			      struct dsa_notifier_fdb_info *info)
{
	/* Do not care yet about other switch chips of the fabric */
	if (ds->index != info->sw_index)
		return 0;

	if (!ds->ops->port_fdb_add)
		return -EOPNOTSUPP;

	return ds->ops->port_fdb_add(ds, info->port, info->addr,
				     info->vid);
}

static int dsa_switch_fdb_del(struct dsa_switch *ds,
			      struct dsa_notifier_fdb_info *info)
{
	/* Do not care yet about other switch chips of the fabric */
	if (ds->index != info->sw_index)
		return 0;

	if (!ds->ops->port_fdb_del)
		return -EOPNOTSUPP;

	return ds->ops->port_fdb_del(ds, info->port, info->addr,
				     info->vid);
}

static int dsa_switch_mdb_add(struct dsa_switch *ds,
			      struct dsa_notifier_mdb_info *info)
{
	const struct switchdev_obj_port_mdb *mdb = info->mdb;
	struct switchdev_trans *trans = info->trans;
	DECLARE_BITMAP(group, ds->num_ports);
	int port, err;

	/* Build a mask of Multicast group members */
	bitmap_zero(group, ds->num_ports);
	if (ds->index == info->sw_index)
		set_bit(info->port, group);
	for (port = 0; port < ds->num_ports; port++)
		if (dsa_is_dsa_port(ds, port))
			set_bit(port, group);

	if (switchdev_trans_ph_prepare(trans)) {
		if (!ds->ops->port_mdb_prepare || !ds->ops->port_mdb_add)
			return -EOPNOTSUPP;

		for_each_set_bit(port, group, ds->num_ports) {
			err = ds->ops->port_mdb_prepare(ds, port, mdb, trans);
			if (err)
				return err;
		}

		return 0;
	}

	for_each_set_bit(port, group, ds->num_ports)
		ds->ops->port_mdb_add(ds, port, mdb, trans);

	return 0;
}

static int dsa_switch_mdb_del(struct dsa_switch *ds,
			      struct dsa_notifier_mdb_info *info)
{
	const struct switchdev_obj_port_mdb *mdb = info->mdb;

	if (!ds->ops->port_mdb_del)
		return -EOPNOTSUPP;

	if (ds->index == info->sw_index)
		return ds->ops->port_mdb_del(ds, info->port, mdb);

	return 0;
}

static int dsa_switch_vlan_add(struct dsa_switch *ds,
			       struct dsa_notifier_vlan_info *info)
{
	const struct switchdev_obj_port_vlan *vlan = info->vlan;
	struct switchdev_trans *trans = info->trans;
	DECLARE_BITMAP(members, ds->num_ports);
	int port, err;

	/* Build a mask of VLAN members */
	bitmap_zero(members, ds->num_ports);
	if (ds->index == info->sw_index)
		set_bit(info->port, members);
	for (port = 0; port < ds->num_ports; port++)
		if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
			set_bit(port, members);

	if (switchdev_trans_ph_prepare(trans)) {
		if (!ds->ops->port_vlan_prepare || !ds->ops->port_vlan_add)
			return -EOPNOTSUPP;

		for_each_set_bit(port, members, ds->num_ports) {
			err = ds->ops->port_vlan_prepare(ds, port, vlan, trans);
			if (err)
				return err;
		}

		return 0;
	}

	for_each_set_bit(port, members, ds->num_ports)
		ds->ops->port_vlan_add(ds, port, vlan, trans);

	return 0;
}

static int dsa_switch_vlan_del(struct dsa_switch *ds,
			       struct dsa_notifier_vlan_info *info)
{
	const struct switchdev_obj_port_vlan *vlan = info->vlan;

	if (!ds->ops->port_vlan_del)
		return -EOPNOTSUPP;

	if (ds->index == info->sw_index)
		return ds->ops->port_vlan_del(ds, info->port, vlan);

	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_AGEING_TIME:
		err = dsa_switch_ageing_time(ds, info);
		break;
	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;
	case DSA_NOTIFIER_FDB_ADD:
		err = dsa_switch_fdb_add(ds, info);
		break;
	case DSA_NOTIFIER_FDB_DEL:
		err = dsa_switch_fdb_del(ds, info);
		break;
	case DSA_NOTIFIER_MDB_ADD:
		err = dsa_switch_mdb_add(ds, info);
		break;
	case DSA_NOTIFIER_MDB_DEL:
		err = dsa_switch_mdb_del(ds, info);
		break;
	case DSA_NOTIFIER_VLAN_ADD:
		err = dsa_switch_vlan_add(ds, info);
		break;
	case DSA_NOTIFIER_VLAN_DEL:
		err = dsa_switch_vlan_del(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);
}
Commit	Line	Data
f515f192 VD	1	/*
	2	* Handling of a single switch chip, part of a switch fabric
	3	*
4333d619 VD	4	* Copyright (c) 2017 Savoir-faire Linux Inc.
4333d619 VD	5	* Vivien Didelot <vivien.didelot@savoirfairelinux.com>
f515f192 VD	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*/
	12
	13	#include <linux/netdevice.h>
	14	#include <linux/notifier.h>
1faabf74	15	#include <net/switchdev.h>
ea5dd34b VD	16
ea5dd34b VD	17	#include "dsa_priv.h"
f515f192	18
1faabf74 VD	19	static unsigned int dsa_switch_fastest_ageing_time(struct dsa_switch *ds,
	20	unsigned int ageing_time)
	21	{
	22	int i;
	23
	24	for (i = 0; i < ds->num_ports; ++i) {
	25	struct dsa_port *dp = &ds->ports[i];
	26
	27	if (dp->ageing_time && dp->ageing_time < ageing_time)
	28	ageing_time = dp->ageing_time;
	29	}
	30
	31	return ageing_time;
	32	}
	33
	34	static int dsa_switch_ageing_time(struct dsa_switch *ds,
	35	struct dsa_notifier_ageing_time_info *info)
	36	{
	37	unsigned int ageing_time = info->ageing_time;
	38	struct switchdev_trans *trans = info->trans;
	39
1faabf74 VD	40	if (switchdev_trans_ph_prepare(trans)) {
	41	if (ds->ageing_time_min && ageing_time < ds->ageing_time_min)
	42	return -ERANGE;
	43	if (ds->ageing_time_max && ageing_time > ds->ageing_time_max)
	44	return -ERANGE;
	45	return 0;
	46	}
	47
	48	/* Program the fastest ageing time in case of multiple bridges */
	49	ageing_time = dsa_switch_fastest_ageing_time(ds, ageing_time);
	50
	51	if (ds->ops->set_ageing_time)
	52	return ds->ops->set_ageing_time(ds, ageing_time);
	53
	54	return 0;
	55	}
	56
04d3a4c6 VD	57	static int dsa_switch_bridge_join(struct dsa_switch *ds,
	58	struct dsa_notifier_bridge_info *info)
	59	{
	60	if (ds->index == info->sw_index && ds->ops->port_bridge_join)
	61	return ds->ops->port_bridge_join(ds, info->port, info->br);
	62
40ef2c93 VD	63	if (ds->index != info->sw_index && ds->ops->crosschip_bridge_join)
	64	return ds->ops->crosschip_bridge_join(ds, info->sw_index,
	65	info->port, info->br);
04d3a4c6 VD	66
	67	return 0;
	68	}
	69
	70	static int dsa_switch_bridge_leave(struct dsa_switch *ds,
	71	struct dsa_notifier_bridge_info *info)
	72	{
	73	if (ds->index == info->sw_index && ds->ops->port_bridge_leave)
	74	ds->ops->port_bridge_leave(ds, info->port, info->br);
	75
40ef2c93 VD	76	if (ds->index != info->sw_index && ds->ops->crosschip_bridge_leave)
	77	ds->ops->crosschip_bridge_leave(ds, info->sw_index, info->port,
	78	info->br);
04d3a4c6 VD	79
	80	return 0;
	81	}
	82
685fb6a4 VD	83	static int dsa_switch_fdb_add(struct dsa_switch *ds,
	84	struct dsa_notifier_fdb_info *info)
	85	{
685fb6a4 VD	86	/* Do not care yet about other switch chips of the fabric */
	87	if (ds->index != info->sw_index)
	88	return 0;
	89
1b6dd556 AS	90	if (!ds->ops->port_fdb_add)
1b6dd556 AS	91	return -EOPNOTSUPP;
685fb6a4	92
2acf4e6a AS	93	return ds->ops->port_fdb_add(ds, info->port, info->addr,
2acf4e6a AS	94	info->vid);
685fb6a4 VD	95	}
	96
	97	static int dsa_switch_fdb_del(struct dsa_switch *ds,
	98	struct dsa_notifier_fdb_info *info)
	99	{
685fb6a4 VD	100	/* Do not care yet about other switch chips of the fabric */
	101	if (ds->index != info->sw_index)
	102	return 0;
	103
	104	if (!ds->ops->port_fdb_del)
	105	return -EOPNOTSUPP;
	106
2acf4e6a AS	107	return ds->ops->port_fdb_del(ds, info->port, info->addr,
2acf4e6a AS	108	info->vid);
685fb6a4 VD	109	}
685fb6a4 VD	110
8ae5bcdc VD	111	static int dsa_switch_mdb_add(struct dsa_switch *ds,
	112	struct dsa_notifier_mdb_info *info)
	113	{
	114	const struct switchdev_obj_port_mdb *mdb = info->mdb;
	115	struct switchdev_trans *trans = info->trans;
a1a6b7ea VD	116	DECLARE_BITMAP(group, ds->num_ports);
a1a6b7ea VD	117	int port, err;
8ae5bcdc	118
a1a6b7ea VD	119	/* Build a mask of Multicast group members */
	120	bitmap_zero(group, ds->num_ports);
	121	if (ds->index == info->sw_index)
	122	set_bit(info->port, group);
	123	for (port = 0; port < ds->num_ports; port++)
ae45102c	124	if (dsa_is_dsa_port(ds, port))
a1a6b7ea	125	set_bit(port, group);
8ae5bcdc VD	126
	127	if (switchdev_trans_ph_prepare(trans)) {
	128	if (!ds->ops->port_mdb_prepare \|\| !ds->ops->port_mdb_add)
	129	return -EOPNOTSUPP;
	130
a1a6b7ea VD	131	for_each_set_bit(port, group, ds->num_ports) {
	132	err = ds->ops->port_mdb_prepare(ds, port, mdb, trans);
	133	if (err)
	134	return err;
	135	}
b0b38a1c VD	136
b0b38a1c VD	137	return 0;
8ae5bcdc VD	138	}
8ae5bcdc VD	139
a1a6b7ea VD	140	for_each_set_bit(port, group, ds->num_ports)
a1a6b7ea VD	141	ds->ops->port_mdb_add(ds, port, mdb, trans);
8ae5bcdc VD	142
	143	return 0;
	144	}
	145
	146	static int dsa_switch_mdb_del(struct dsa_switch *ds,
	147	struct dsa_notifier_mdb_info *info)
	148	{
	149	const struct switchdev_obj_port_mdb *mdb = info->mdb;
	150
8ae5bcdc VD	151	if (!ds->ops->port_mdb_del)
	152	return -EOPNOTSUPP;
	153
a1a6b7ea VD	154	if (ds->index == info->sw_index)
	155	return ds->ops->port_mdb_del(ds, info->port, mdb);
	156
	157	return 0;
8ae5bcdc VD	158	}
8ae5bcdc VD	159
d0c627b8 VD	160	static int dsa_switch_vlan_add(struct dsa_switch *ds,
	161	struct dsa_notifier_vlan_info *info)
	162	{
	163	const struct switchdev_obj_port_vlan *vlan = info->vlan;
	164	struct switchdev_trans *trans = info->trans;
1ca4aa9c VD	165	DECLARE_BITMAP(members, ds->num_ports);
1ca4aa9c VD	166	int port, err;
d0c627b8	167
1ca4aa9c VD	168	/* Build a mask of VLAN members */
	169	bitmap_zero(members, ds->num_ports);
	170	if (ds->index == info->sw_index)
	171	set_bit(info->port, members);
b2f81d30 VD	172	for (port = 0; port < ds->num_ports; port++)
	173	if (dsa_is_cpu_port(ds, port) \|\| dsa_is_dsa_port(ds, port))
	174	set_bit(port, members);
d0c627b8 VD	175
	176	if (switchdev_trans_ph_prepare(trans)) {
	177	if (!ds->ops->port_vlan_prepare \|\| !ds->ops->port_vlan_add)
	178	return -EOPNOTSUPP;
	179
1ca4aa9c VD	180	for_each_set_bit(port, members, ds->num_ports) {
	181	err = ds->ops->port_vlan_prepare(ds, port, vlan, trans);
	182	if (err)
	183	return err;
	184	}
2118df93 VD	185
2118df93 VD	186	return 0;
d0c627b8 VD	187	}
d0c627b8 VD	188
1ca4aa9c VD	189	for_each_set_bit(port, members, ds->num_ports)
1ca4aa9c VD	190	ds->ops->port_vlan_add(ds, port, vlan, trans);
d0c627b8 VD	191
	192	return 0;
	193	}
	194
	195	static int dsa_switch_vlan_del(struct dsa_switch *ds,
	196	struct dsa_notifier_vlan_info *info)
	197	{
	198	const struct switchdev_obj_port_vlan *vlan = info->vlan;
	199
d0c627b8 VD	200	if (!ds->ops->port_vlan_del)
	201	return -EOPNOTSUPP;
	202
1ca4aa9c VD	203	if (ds->index == info->sw_index)
	204	return ds->ops->port_vlan_del(ds, info->port, vlan);
	205
	206	return 0;
d0c627b8 VD	207	}
d0c627b8 VD	208
f515f192 VD	209	static int dsa_switch_event(struct notifier_block *nb,
	210	unsigned long event, void *info)
	211	{
	212	struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb);
	213	int err;
	214
	215	switch (event) {
1faabf74 VD	216	case DSA_NOTIFIER_AGEING_TIME:
	217	err = dsa_switch_ageing_time(ds, info);
	218	break;
04d3a4c6 VD	219	case DSA_NOTIFIER_BRIDGE_JOIN:
	220	err = dsa_switch_bridge_join(ds, info);
	221	break;
	222	case DSA_NOTIFIER_BRIDGE_LEAVE:
	223	err = dsa_switch_bridge_leave(ds, info);
	224	break;
685fb6a4 VD	225	case DSA_NOTIFIER_FDB_ADD:
	226	err = dsa_switch_fdb_add(ds, info);
	227	break;
	228	case DSA_NOTIFIER_FDB_DEL:
	229	err = dsa_switch_fdb_del(ds, info);
	230	break;
8ae5bcdc VD	231	case DSA_NOTIFIER_MDB_ADD:
	232	err = dsa_switch_mdb_add(ds, info);
	233	break;
	234	case DSA_NOTIFIER_MDB_DEL:
	235	err = dsa_switch_mdb_del(ds, info);
	236	break;
d0c627b8 VD	237	case DSA_NOTIFIER_VLAN_ADD:
	238	err = dsa_switch_vlan_add(ds, info);
	239	break;
	240	case DSA_NOTIFIER_VLAN_DEL:
	241	err = dsa_switch_vlan_del(ds, info);
	242	break;
f515f192 VD	243	default:
	244	err = -EOPNOTSUPP;
	245	break;
	246	}
	247
	248	/* Non-switchdev operations cannot be rolled back. If a DSA driver
	249	* returns an error during the chained call, switch chips may be in an
	250	* inconsistent state.
	251	*/
	252	if (err)
	253	dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n",
	254	event, err);
	255
	256	return notifier_from_errno(err);
	257	}
	258
	259	int dsa_switch_register_notifier(struct dsa_switch *ds)
	260	{
	261	ds->nb.notifier_call = dsa_switch_event;
	262
	263	return raw_notifier_chain_register(&ds->dst->nh, &ds->nb);
	264	}
	265
	266	void dsa_switch_unregister_notifier(struct dsa_switch *ds)
	267	{
	268	int err;
	269
	270	err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb);
	271	if (err)
	272	dev_err(ds->dev, "failed to unregister notifier (%d)\n", err);
	273	}