net: dsa: add switch notifier

Add a notifier block per DSA switch, registered against a notifier head
in the switch fabric they belong to.

This infrastructure will allow to propagate fabric-wide events such as
port bridging, VLAN configuration, etc. If a DSA switch driver cares
about cross-chip configuration, such events can be caught.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vivien Didelot 2017-02-03 13:20:20 -05:00 committed by David S. Miller
parent c5d35cb32c
commit f515f192ab
6 changed files with 77 additions and 0 deletions

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@ -13,6 +13,7 @@
#include <linux/if_ether.h>
#include <linux/list.h>
#include <linux/notifier.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/of.h>
@ -92,6 +93,9 @@ struct packet_type;
struct dsa_switch_tree {
struct list_head list;
/* Notifier chain for switch-wide events */
struct raw_notifier_head nh;
/* Tree identifier */
u32 tree;
@ -182,6 +186,9 @@ struct dsa_switch {
struct dsa_switch_tree *dst;
int index;
/* Listener for switch fabric events */
struct notifier_block nb;
/*
* Give the switch driver somewhere to hang its private data
* structure.

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@ -1,6 +1,7 @@
# the core
obj-$(CONFIG_NET_DSA) += dsa_core.o
dsa_core-y += dsa.o slave.o dsa2.o
dsa_core-y += dsa.o slave.o dsa2.o switch.o
# tagging formats
dsa_core-$(CONFIG_NET_DSA_TAG_BRCM) += tag_brcm.o

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@ -275,6 +275,10 @@ static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
if (ret < 0)
return ret;
ret = dsa_switch_register_notifier(ds);
if (ret)
return ret;
if (ops->set_addr) {
ret = ops->set_addr(ds, dst->master_netdev->dev_addr);
if (ret < 0)
@ -400,6 +404,8 @@ static void dsa_switch_destroy(struct dsa_switch *ds)
if (ds->slave_mii_bus && ds->ops->phy_read)
mdiobus_unregister(ds->slave_mii_bus);
dsa_switch_unregister_notifier(ds);
}
#ifdef CONFIG_PM_SLEEP

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@ -294,6 +294,10 @@ static int dsa_ds_apply(struct dsa_switch_tree *dst, struct dsa_switch *ds)
if (err < 0)
return err;
err = dsa_switch_register_notifier(ds);
if (err)
return err;
if (ds->ops->set_addr) {
err = ds->ops->set_addr(ds, dst->master_netdev->dev_addr);
if (err < 0)
@ -364,6 +368,8 @@ static void dsa_ds_unapply(struct dsa_switch_tree *dst, struct dsa_switch *ds)
if (ds->slave_mii_bus && ds->ops->phy_read)
mdiobus_unregister(ds->slave_mii_bus);
dsa_switch_unregister_notifier(ds);
}
static int dsa_dst_apply(struct dsa_switch_tree *dst)

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@ -66,6 +66,10 @@ int dsa_slave_resume(struct net_device *slave_dev);
int dsa_slave_register_notifier(void);
void dsa_slave_unregister_notifier(void);
/* switch.c */
int dsa_switch_register_notifier(struct dsa_switch *ds);
void dsa_switch_unregister_notifier(struct dsa_switch *ds);
/* tag_dsa.c */
extern const struct dsa_device_ops dsa_netdev_ops;

53
net/dsa/switch.c Normal file
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@ -0,0 +1,53 @@
/*
* 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_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) {
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);
}