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net: dsa: introduce bridge notifier

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A slave device will now notify the switch fabric once its port is
bridged or unbridged, instead of calling directly its switch operations.

This code allows propagating cross-chip bridging events in the fabric.

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 13:20:21 -05:00 committed by David S. Miller
parent f515f192ab
commit 04d3a4c6af
3 changed files with 71 additions and 11 deletions
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10
include/net/dsa.h
View file

@ -268,6 +268,16 @@ struct switchdev_obj_port_fdb;
struct switchdev_obj_port_mdb;
struct switchdev_obj_port_vlan;
#define DSA_NOTIFIER_BRIDGE_JOIN 1
#define DSA_NOTIFIER_BRIDGE_LEAVE 2
/* DSA_NOTIFIER_BRIDGE_* */
struct dsa_notifier_bridge_info {
struct net_device *br;
int sw_index;
int port;
};
struct dsa_switch_ops {
/*
* Probing and setup.

40
net/dsa/slave.c
View file

@ -27,6 +27,17 @@
static bool dsa_slave_dev_check(struct net_device *dev);
static int dsa_slave_notify(struct net_device *dev, unsigned long e, void *v)
{
struct dsa_slave_priv *p = netdev_priv(dev);
struct raw_notifier_head *nh = &p->dp->ds->dst->nh;
int err;
err = raw_notifier_call_chain(nh, e, v);
return notifier_to_errno(err);
}
/* slave mii_bus handling ***************************************************/
static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
{
@ -562,39 +573,46 @@ static int dsa_slave_bridge_port_join(struct net_device *dev,
struct net_device *br)
{
struct dsa_slave_priv *p = netdev_priv(dev);
struct dsa_switch *ds = p->dp->ds;
int ret = -EOPNOTSUPP;
struct dsa_notifier_bridge_info info = {
.sw_index = p->dp->ds->index,
.port = p->dp->index,
.br = br,
};
int err;
/* Here the port is already bridged. Reflect the current configuration
* so that drivers can program their chips accordingly.
*/
p->dp->bridge_dev = br;
if (ds->ops->port_bridge_join)
ret = ds->ops->port_bridge_join(ds, p->dp->index, br);
err = dsa_slave_notify(dev, DSA_NOTIFIER_BRIDGE_JOIN, &info);
/* The bridging is rolled back on error */
if (ret && ret != -EOPNOTSUPP) {
if (err)
p->dp->bridge_dev = NULL;
return ret;
}
return 0;
return err;
}
static void dsa_slave_bridge_port_leave(struct net_device *dev,
struct net_device *br)
{
struct dsa_slave_priv *p = netdev_priv(dev);
struct dsa_switch *ds = p->dp->ds;
struct dsa_notifier_bridge_info info = {
.sw_index = p->dp->ds->index,
.port = p->dp->index,
.br = br,
};
int err;
/* Here the port is already unbridged. Reflect the current configuration
* so that drivers can program their chips accordingly.
*/
p->dp->bridge_dev = NULL;
if (ds->ops->port_bridge_leave)
ds->ops->port_bridge_leave(ds, p->dp->index, br);
err = dsa_slave_notify(dev, DSA_NOTIFIER_BRIDGE_LEAVE, &info);
if (err)
netdev_err(dev, "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

32
net/dsa/switch.c
View file

@ -13,6 +13,32 @@
#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)
{
@ -20,6 +46,12 @@ static int dsa_switch_event(struct notifier_block *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;