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// SPDX-License-Identifier: GPL-2.0+
#include <net/switchdev.h>
#include "lan966x_main.h"
struct lan966x_fdb_event_work {
struct work_struct work;
struct switchdev_notifier_fdb_info fdb_info;
struct net_device *dev;
struct lan966x *lan966x;
unsigned long event;
};
struct lan966x_fdb_entry {
struct list_head list;
unsigned char mac[ETH_ALEN] __aligned(2);
u16 vid;
u32 references;
};
static struct lan966x_fdb_entry *
lan966x_fdb_find_entry(struct lan966x *lan966x,
struct switchdev_notifier_fdb_info *fdb_info)
{
struct lan966x_fdb_entry *fdb_entry;
list_for_each_entry(fdb_entry, &lan966x->fdb_entries, list) {
if (fdb_entry->vid == fdb_info->vid &&
ether_addr_equal(fdb_entry->mac, fdb_info->addr))
return fdb_entry;
}
return NULL;
}
static void lan966x_fdb_add_entry(struct lan966x *lan966x,
struct switchdev_notifier_fdb_info *fdb_info)
{
struct lan966x_fdb_entry *fdb_entry;
fdb_entry = lan966x_fdb_find_entry(lan966x, fdb_info);
if (fdb_entry) {
fdb_entry->references++;
return;
}
fdb_entry = kzalloc(sizeof(*fdb_entry), GFP_KERNEL);
if (!fdb_entry)
return;
ether_addr_copy(fdb_entry->mac, fdb_info->addr);
fdb_entry->vid = fdb_info->vid;
fdb_entry->references = 1;
list_add_tail(&fdb_entry->list, &lan966x->fdb_entries);
}
static bool lan966x_fdb_del_entry(struct lan966x *lan966x,
struct switchdev_notifier_fdb_info *fdb_info)
{
struct lan966x_fdb_entry *fdb_entry, *tmp;
list_for_each_entry_safe(fdb_entry, tmp, &lan966x->fdb_entries,
list) {
if (fdb_entry->vid == fdb_info->vid &&
ether_addr_equal(fdb_entry->mac, fdb_info->addr)) {
fdb_entry->references--;
if (!fdb_entry->references) {
list_del(&fdb_entry->list);
kfree(fdb_entry);
return true;
}
break;
}
}
return false;
}
void lan966x_fdb_write_entries(struct lan966x *lan966x, u16 vid)
{
struct lan966x_fdb_entry *fdb_entry;
list_for_each_entry(fdb_entry, &lan966x->fdb_entries, list) {
if (fdb_entry->vid != vid)
continue;
lan966x_mac_cpu_learn(lan966x, fdb_entry->mac, fdb_entry->vid);
}
}
void lan966x_fdb_erase_entries(struct lan966x *lan966x, u16 vid)
{
struct lan966x_fdb_entry *fdb_entry;
list_for_each_entry(fdb_entry, &lan966x->fdb_entries, list) {
if (fdb_entry->vid != vid)
continue;
lan966x_mac_cpu_forget(lan966x, fdb_entry->mac, fdb_entry->vid);
}
}
static void lan966x_fdb_purge_entries(struct lan966x *lan966x)
{
struct lan966x_fdb_entry *fdb_entry, *tmp;
list_for_each_entry_safe(fdb_entry, tmp, &lan966x->fdb_entries, list) {
list_del(&fdb_entry->list);
kfree(fdb_entry);
}
}
int lan966x_fdb_init(struct lan966x *lan966x)
{
INIT_LIST_HEAD(&lan966x->fdb_entries);
lan966x->fdb_work = alloc_ordered_workqueue("lan966x_order", 0);
if (!lan966x->fdb_work)
return -ENOMEM;
return 0;
}
void lan966x_fdb_deinit(struct lan966x *lan966x)
{
destroy_workqueue(lan966x->fdb_work);
lan966x_fdb_purge_entries(lan966x);
}
static void lan966x_fdb_event_work(struct work_struct *work)
{
struct lan966x_fdb_event_work *fdb_work =
container_of(work, struct lan966x_fdb_event_work, work);
struct switchdev_notifier_fdb_info *fdb_info;
struct net_device *dev = fdb_work->dev;
struct lan966x_port *port;
struct lan966x *lan966x;
int ret;
fdb_info = &fdb_work->fdb_info;
lan966x = fdb_work->lan966x;
if (lan966x_netdevice_check(dev)) {
port = netdev_priv(dev);
switch (fdb_work->event) {
case SWITCHDEV_FDB_ADD_TO_DEVICE:
if (!fdb_info->added_by_user)
break;
lan966x_mac_add_entry(lan966x, port, fdb_info->addr,
fdb_info->vid);
break;
case SWITCHDEV_FDB_DEL_TO_DEVICE:
if (!fdb_info->added_by_user)
break;
lan966x_mac_del_entry(lan966x, fdb_info->addr,
fdb_info->vid);
break;
}
} else {
if (!netif_is_bridge_master(dev))
goto out;
/* In case the bridge is called */
switch (fdb_work->event) {
case SWITCHDEV_FDB_ADD_TO_DEVICE:
/* If there is no front port in this vlan, there is no
* point to copy the frame to CPU because it would be
* just dropped at later point. So add it only if
* there is a port but it is required to store the fdb
* entry for later point when a port actually gets in
* the vlan.
*/
lan966x_fdb_add_entry(lan966x, fdb_info);
if (!lan966x_vlan_cpu_member_cpu_vlan_mask(lan966x,
fdb_info->vid))
break;
lan966x_mac_cpu_learn(lan966x, fdb_info->addr,
fdb_info->vid);
break;
case SWITCHDEV_FDB_DEL_TO_DEVICE:
ret = lan966x_fdb_del_entry(lan966x, fdb_info);
if (!lan966x_vlan_cpu_member_cpu_vlan_mask(lan966x,
fdb_info->vid))
break;
if (ret)
lan966x_mac_cpu_forget(lan966x, fdb_info->addr,
fdb_info->vid);
break;
}
}
out:
kfree(fdb_work->fdb_info.addr);
kfree(fdb_work);
dev_put(dev);
}
int lan966x_handle_fdb(struct net_device *dev,
struct net_device *orig_dev,
unsigned long event, const void *ctx,
const struct switchdev_notifier_fdb_info *fdb_info)
{
struct lan966x_port *port = netdev_priv(dev);
struct lan966x *lan966x = port->lan966x;
struct lan966x_fdb_event_work *fdb_work;
if (ctx && ctx != port)
return 0;
switch (event) {
case SWITCHDEV_FDB_ADD_TO_DEVICE:
case SWITCHDEV_FDB_DEL_TO_DEVICE:
if (lan966x_netdevice_check(orig_dev) &&
!fdb_info->added_by_user)
break;
fdb_work = kzalloc(sizeof(*fdb_work), GFP_ATOMIC);
if (!fdb_work)
return -ENOMEM;
fdb_work->dev = orig_dev;
fdb_work->lan966x = lan966x;
fdb_work->event = event;
INIT_WORK(&fdb_work->work, lan966x_fdb_event_work);
memcpy(&fdb_work->fdb_info, fdb_info, sizeof(fdb_work->fdb_info));
fdb_work->fdb_info.addr = kzalloc(ETH_ALEN, GFP_ATOMIC);
if (!fdb_work->fdb_info.addr)
goto err_addr_alloc;
ether_addr_copy((u8 *)fdb_work->fdb_info.addr, fdb_info->addr);
dev_hold(orig_dev);
queue_work(lan966x->fdb_work, &fdb_work->work);
break;
}
return 0;
err_addr_alloc:
kfree(fdb_work);
return -ENOMEM;
}
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