[linux-block.git] / net / dsa / port.c

/*
 * 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 <linux/notifier.h>

#include "dsa_priv.h"

static int dsa_port_notify(struct dsa_port *dp, unsigned long e, void *v)
{
	struct raw_notifier_head *nh = &dp->ds->dst->nh;
	int err;

	err = raw_notifier_call_chain(nh, e, v);

	return notifier_to_errno(err);
}

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);
}

int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br)
{
	struct dsa_notifier_bridge_info info = {
		.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.
	 */
	dp->bridge_dev = br;

	err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_JOIN, &info);

	/* The bridging is rolled back on error */
	if (err)
		dp->bridge_dev = NULL;

	return err;
}

void dsa_port_bridge_leave(struct dsa_port *dp, struct net_device *br)
{
	struct dsa_notifier_bridge_info info = {
		.sw_index = dp->ds->index,
		.port = dp->index,
		.br = br,
	};
	int err;

	/* Here the port is already unbridged. Reflect the current configuration
	 * so that drivers can program their chips accordingly.
	 */
	dp->bridge_dev = NULL;

	err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_LEAVE, &info);
	if (err)
		pr_err("DSA: failed to notify DSA_NOTIFIER_BRIDGE_LEAVE\n");

	/* 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
	 */
	dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
}

int dsa_port_vlan_filtering(struct dsa_port *dp, bool vlan_filtering,
			    struct switchdev_trans *trans)
{
	struct dsa_switch *ds = dp->ds;

	/* bridge skips -EOPNOTSUPP, so skip the prepare phase */
	if (switchdev_trans_ph_prepare(trans))
		return 0;

	if (ds->ops->port_vlan_filtering)
		return ds->ops->port_vlan_filtering(ds, dp->index,
						    vlan_filtering);

	return 0;
}

static unsigned int dsa_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;
}

int dsa_port_ageing_time(struct dsa_port *dp, clock_t ageing_clock,
			 struct switchdev_trans *trans)
{
	unsigned long ageing_jiffies = clock_t_to_jiffies(ageing_clock);
	unsigned int ageing_time = jiffies_to_msecs(ageing_jiffies);
	struct dsa_switch *ds = dp->ds;

	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;
	}

	/* Keep the fastest ageing time in case of multiple bridges */
	dp->ageing_time = ageing_time;
	ageing_time = dsa_fastest_ageing_time(ds, ageing_time);

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

	return 0;
}

int dsa_port_fdb_add(struct dsa_port *dp,
		     const struct switchdev_obj_port_fdb *fdb,
		     struct switchdev_trans *trans)
{
	struct dsa_switch *ds = dp->ds;

	if (switchdev_trans_ph_prepare(trans)) {
		if (!ds->ops->port_fdb_prepare || !ds->ops->port_fdb_add)
			return -EOPNOTSUPP;

		return ds->ops->port_fdb_prepare(ds, dp->index, fdb, trans);
	}

	ds->ops->port_fdb_add(ds, dp->index, fdb, trans);

	return 0;
}

int dsa_port_fdb_del(struct dsa_port *dp,
		     const struct switchdev_obj_port_fdb *fdb)
{
	struct dsa_switch *ds = dp->ds;

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

	return ds->ops->port_fdb_del(ds, dp->index, fdb);
}

int dsa_port_fdb_dump(struct dsa_port *dp, struct switchdev_obj_port_fdb *fdb,
		      switchdev_obj_dump_cb_t *cb)
{
	struct dsa_switch *ds = dp->ds;

	if (ds->ops->port_fdb_dump)
		return ds->ops->port_fdb_dump(ds, dp->index, fdb, cb);

	return -EOPNOTSUPP;
}

int dsa_port_mdb_add(struct dsa_port *dp,
		     const struct switchdev_obj_port_mdb *mdb,
		     struct switchdev_trans *trans)
{
	struct dsa_switch *ds = dp->ds;

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

		return ds->ops->port_mdb_prepare(ds, dp->index, mdb, trans);
	}

	ds->ops->port_mdb_add(ds, dp->index, mdb, trans);

	return 0;
}

int dsa_port_mdb_del(struct dsa_port *dp,
		     const struct switchdev_obj_port_mdb *mdb)
{
	struct dsa_switch *ds = dp->ds;

	if (ds->ops->port_mdb_del)
		return ds->ops->port_mdb_del(ds, dp->index, mdb);

	return -EOPNOTSUPP;
}

int dsa_port_mdb_dump(struct dsa_port *dp, struct switchdev_obj_port_mdb *mdb,
		      switchdev_obj_dump_cb_t *cb)
{
	struct dsa_switch *ds = dp->ds;

	if (ds->ops->port_mdb_dump)
		return ds->ops->port_mdb_dump(ds, dp->index, mdb, cb);

	return -EOPNOTSUPP;
}
Commit	Line	Data
a40c175b VD	1	/*
	2	* Handling of a single switch port
	3	*
	4	* Copyright (c) 2017 Savoir-faire Linux Inc.
	5	* Vivien Didelot <vivien.didelot@savoirfairelinux.com>
	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/if_bridge.h>
cfbed329	14	#include <linux/notifier.h>
a40c175b VD	15
	16	#include "dsa_priv.h"
	17
cfbed329 VD	18	static int dsa_port_notify(struct dsa_port dp, unsigned long e, void v)
	19	{
	20	struct raw_notifier_head *nh = &dp->ds->dst->nh;
	21	int err;
	22
	23	err = raw_notifier_call_chain(nh, e, v);
	24
	25	return notifier_to_errno(err);
	26	}
	27
a40c175b VD	28	int dsa_port_set_state(struct dsa_port *dp, u8 state,
	29	struct switchdev_trans *trans)
	30	{
	31	struct dsa_switch *ds = dp->ds;
	32	int port = dp->index;
	33
	34	if (switchdev_trans_ph_prepare(trans))
	35	return ds->ops->port_stp_state_set ? 0 : -EOPNOTSUPP;
	36
	37	if (ds->ops->port_stp_state_set)
	38	ds->ops->port_stp_state_set(ds, port, state);
	39
	40	if (ds->ops->port_fast_age) {
	41	/* Fast age FDB entries or flush appropriate forwarding database
	42	* for the given port, if we are moving it from Learning or
	43	* Forwarding state, to Disabled or Blocking or Listening state.
	44	*/
	45
	46	if ((dp->stp_state == BR_STATE_LEARNING \|\|
	47	dp->stp_state == BR_STATE_FORWARDING) &&
	48	(state == BR_STATE_DISABLED \|\|
	49	state == BR_STATE_BLOCKING \|\|
	50	state == BR_STATE_LISTENING))
	51	ds->ops->port_fast_age(ds, port);
	52	}
	53
	54	dp->stp_state = state;
	55
	56	return 0;
	57	}
	58
	59	void dsa_port_set_state_now(struct dsa_port *dp, u8 state)
	60	{
	61	int err;
	62
	63	err = dsa_port_set_state(dp, state, NULL);
	64	if (err)
	65	pr_err("DSA: failed to set STP state %u (%d)\n", state, err);
	66	}
cfbed329 VD	67
	68	int dsa_port_bridge_join(struct dsa_port dp, struct net_device br)
	69	{
	70	struct dsa_notifier_bridge_info info = {
	71	.sw_index = dp->ds->index,
	72	.port = dp->index,
	73	.br = br,
	74	};
	75	int err;
	76
	77	/* Here the port is already bridged. Reflect the current configuration
	78	* so that drivers can program their chips accordingly.
	79	*/
	80	dp->bridge_dev = br;
	81
	82	err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_JOIN, &info);
	83
	84	/* The bridging is rolled back on error */
	85	if (err)
	86	dp->bridge_dev = NULL;
	87
	88	return err;
	89	}
	90
	91	void dsa_port_bridge_leave(struct dsa_port dp, struct net_device br)
	92	{
	93	struct dsa_notifier_bridge_info info = {
	94	.sw_index = dp->ds->index,
	95	.port = dp->index,
	96	.br = br,
	97	};
	98	int err;
	99
	100	/* Here the port is already unbridged. Reflect the current configuration
	101	* so that drivers can program their chips accordingly.
	102	*/
	103	dp->bridge_dev = NULL;
	104
	105	err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_LEAVE, &info);
	106	if (err)
	107	pr_err("DSA: failed to notify DSA_NOTIFIER_BRIDGE_LEAVE\n");
	108
	109	/* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
	110	* so allow it to be in BR_STATE_FORWARDING to be kept functional
	111	*/
	112	dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
	113	}
4d61d304 VD	114
	115	int dsa_port_vlan_filtering(struct dsa_port *dp, bool vlan_filtering,
	116	struct switchdev_trans *trans)
	117	{
	118	struct dsa_switch *ds = dp->ds;
	119
	120	/* bridge skips -EOPNOTSUPP, so skip the prepare phase */
	121	if (switchdev_trans_ph_prepare(trans))
	122	return 0;
	123
	124	if (ds->ops->port_vlan_filtering)
	125	return ds->ops->port_vlan_filtering(ds, dp->index,
	126	vlan_filtering);
	127
	128	return 0;
	129	}
d87bd94e VD	130
	131	static unsigned int dsa_fastest_ageing_time(struct dsa_switch *ds,
	132	unsigned int ageing_time)
	133	{
	134	int i;
	135
	136	for (i = 0; i < ds->num_ports; ++i) {
	137	struct dsa_port *dp = &ds->ports[i];
	138
	139	if (dp->ageing_time && dp->ageing_time < ageing_time)
	140	ageing_time = dp->ageing_time;
	141	}
	142
	143	return ageing_time;
	144	}
	145
	146	int dsa_port_ageing_time(struct dsa_port *dp, clock_t ageing_clock,
	147	struct switchdev_trans *trans)
	148	{
	149	unsigned long ageing_jiffies = clock_t_to_jiffies(ageing_clock);
	150	unsigned int ageing_time = jiffies_to_msecs(ageing_jiffies);
	151	struct dsa_switch *ds = dp->ds;
	152
	153	if (switchdev_trans_ph_prepare(trans)) {
	154	if (ds->ageing_time_min && ageing_time < ds->ageing_time_min)
	155	return -ERANGE;
	156	if (ds->ageing_time_max && ageing_time > ds->ageing_time_max)
	157	return -ERANGE;
	158	return 0;
	159	}
	160
	161	/* Keep the fastest ageing time in case of multiple bridges */
	162	dp->ageing_time = ageing_time;
	163	ageing_time = dsa_fastest_ageing_time(ds, ageing_time);
	164
	165	if (ds->ops->set_ageing_time)
	166	return ds->ops->set_ageing_time(ds, ageing_time);
	167
	168	return 0;
	169	}
d1cffff0 VD	170
	171	int dsa_port_fdb_add(struct dsa_port *dp,
	172	const struct switchdev_obj_port_fdb *fdb,
	173	struct switchdev_trans *trans)
	174	{
	175	struct dsa_switch *ds = dp->ds;
	176
	177	if (switchdev_trans_ph_prepare(trans)) {
	178	if (!ds->ops->port_fdb_prepare \|\| !ds->ops->port_fdb_add)
	179	return -EOPNOTSUPP;
	180
	181	return ds->ops->port_fdb_prepare(ds, dp->index, fdb, trans);
	182	}
	183
	184	ds->ops->port_fdb_add(ds, dp->index, fdb, trans);
	185
	186	return 0;
	187	}
	188
	189	int dsa_port_fdb_del(struct dsa_port *dp,
	190	const struct switchdev_obj_port_fdb *fdb)
	191	{
	192	struct dsa_switch *ds = dp->ds;
	193
	194	if (ds->ops->port_fdb_del)
	195	return -EOPNOTSUPP;
	196
	197	return ds->ops->port_fdb_del(ds, dp->index, fdb);
	198	}
	199
	200	int dsa_port_fdb_dump(struct dsa_port dp, struct switchdev_obj_port_fdb fdb,
	201	switchdev_obj_dump_cb_t *cb)
	202	{
	203	struct dsa_switch *ds = dp->ds;
	204
	205	if (ds->ops->port_fdb_dump)
	206	return ds->ops->port_fdb_dump(ds, dp->index, fdb, cb);
	207
	208	return -EOPNOTSUPP;
	209	}
3a9afea3 VD	210
	211	int dsa_port_mdb_add(struct dsa_port *dp,
	212	const struct switchdev_obj_port_mdb *mdb,
	213	struct switchdev_trans *trans)
	214	{
	215	struct dsa_switch *ds = dp->ds;
	216
	217	if (switchdev_trans_ph_prepare(trans)) {
	218	if (!ds->ops->port_mdb_prepare \|\| !ds->ops->port_mdb_add)
	219	return -EOPNOTSUPP;
	220
	221	return ds->ops->port_mdb_prepare(ds, dp->index, mdb, trans);
	222	}
	223
	224	ds->ops->port_mdb_add(ds, dp->index, mdb, trans);
	225
	226	return 0;
	227	}
	228
	229	int dsa_port_mdb_del(struct dsa_port *dp,
	230	const struct switchdev_obj_port_mdb *mdb)
	231	{
	232	struct dsa_switch *ds = dp->ds;
	233
	234	if (ds->ops->port_mdb_del)
	235	return ds->ops->port_mdb_del(ds, dp->index, mdb);
	236
	237	return -EOPNOTSUPP;
	238	}
	239
	240	int dsa_port_mdb_dump(struct dsa_port dp, struct switchdev_obj_port_mdb mdb,
	241	switchdev_obj_dump_cb_t *cb)
	242	{
	243	struct dsa_switch *ds = dp->ds;
	244
	245	if (ds->ops->port_mdb_dump)
	246	return ds->ops->port_mdb_dump(ds, dp->index, mdb, cb);
	247
	248	return -EOPNOTSUPP;
	249	}