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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* net/dsa/dsa.c - Hardware switch handling
* Copyright (c) 2008-2009 Marvell Semiconductor
* Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
*/
#include <linux/device.h>
#include <linux/list.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/of.h>
#include <linux/of_mdio.h>
#include <linux/of_platform.h>
#include <linux/of_net.h>
#include <linux/netdevice.h>
#include <linux/sysfs.h>
#include <linux/phy_fixed.h>
#include <linux/ptp_classify.h>
#include <linux/etherdevice.h>
#include "dsa_priv.h"
static LIST_HEAD(dsa_tag_drivers_list);
static DEFINE_MUTEX(dsa_tag_drivers_lock);
static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
struct net_device *dev)
{
/* Just return the original SKB */
return skb;
}
static const struct dsa_device_ops none_ops = {
.name = "none",
.proto = DSA_TAG_PROTO_NONE,
.xmit = dsa_slave_notag_xmit,
.rcv = NULL,
};
DSA_TAG_DRIVER(none_ops);
static void dsa_tag_driver_register(struct dsa_tag_driver *dsa_tag_driver,
struct module *owner)
{
dsa_tag_driver->owner = owner;
mutex_lock(&dsa_tag_drivers_lock);
list_add_tail(&dsa_tag_driver->list, &dsa_tag_drivers_list);
mutex_unlock(&dsa_tag_drivers_lock);
}
void dsa_tag_drivers_register(struct dsa_tag_driver *dsa_tag_driver_array[],
unsigned int count, struct module *owner)
{
unsigned int i;
for (i = 0; i < count; i++)
dsa_tag_driver_register(dsa_tag_driver_array[i], owner);
}
static void dsa_tag_driver_unregister(struct dsa_tag_driver *dsa_tag_driver)
{
mutex_lock(&dsa_tag_drivers_lock);
list_del(&dsa_tag_driver->list);
mutex_unlock(&dsa_tag_drivers_lock);
}
EXPORT_SYMBOL_GPL(dsa_tag_drivers_register);
void dsa_tag_drivers_unregister(struct dsa_tag_driver *dsa_tag_driver_array[],
unsigned int count)
{
unsigned int i;
for (i = 0; i < count; i++)
dsa_tag_driver_unregister(dsa_tag_driver_array[i]);
}
EXPORT_SYMBOL_GPL(dsa_tag_drivers_unregister);
const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops)
{
return ops->name;
};
const struct dsa_device_ops *dsa_tag_driver_get(int tag_protocol)
{
struct dsa_tag_driver *dsa_tag_driver;
const struct dsa_device_ops *ops;
char module_name[128];
bool found = false;
snprintf(module_name, 127, "%s%d", DSA_TAG_DRIVER_ALIAS,
tag_protocol);
request_module(module_name);
mutex_lock(&dsa_tag_drivers_lock);
list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
ops = dsa_tag_driver->ops;
if (ops->proto == tag_protocol) {
found = true;
break;
}
}
if (found) {
if (!try_module_get(dsa_tag_driver->owner))
ops = ERR_PTR(-ENOPROTOOPT);
} else {
ops = ERR_PTR(-ENOPROTOOPT);
}
mutex_unlock(&dsa_tag_drivers_lock);
return ops;
}
void dsa_tag_driver_put(const struct dsa_device_ops *ops)
{
struct dsa_tag_driver *dsa_tag_driver;
mutex_lock(&dsa_tag_drivers_lock);
list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
if (dsa_tag_driver->ops == ops) {
module_put(dsa_tag_driver->owner);
break;
}
}
mutex_unlock(&dsa_tag_drivers_lock);
}
static int dev_is_class(struct device *dev, void *class)
{
if (dev->class != NULL && !strcmp(dev->class->name, class))
return 1;
return 0;
}
static struct device *dev_find_class(struct device *parent, char *class)
{
if (dev_is_class(parent, class)) {
get_device(parent);
return parent;
}
return device_find_child(parent, class, dev_is_class);
}
struct net_device *dsa_dev_to_net_device(struct device *dev)
{
struct device *d;
d = dev_find_class(dev, "net");
if (d != NULL) {
struct net_device *nd;
nd = to_net_dev(d);
dev_hold(nd);
put_device(d);
return nd;
}
return NULL;
}
EXPORT_SYMBOL_GPL(dsa_dev_to_net_device);
/* Determine if we should defer delivery of skb until we have a rx timestamp.
*
* Called from dsa_switch_rcv. For now, this will only work if tagging is
* enabled on the switch. Normally the MAC driver would retrieve the hardware
* timestamp when it reads the packet out of the hardware. However in a DSA
* switch, the DSA driver owning the interface to which the packet is
* delivered is never notified unless we do so here.
*/
static bool dsa_skb_defer_rx_timestamp(struct dsa_slave_priv *p,
struct sk_buff *skb)
{
struct dsa_switch *ds = p->dp->ds;
unsigned int type;
if (skb_headroom(skb) < ETH_HLEN)
return false;
__skb_push(skb, ETH_HLEN);
type = ptp_classify_raw(skb);
__skb_pull(skb, ETH_HLEN);
if (type == PTP_CLASS_NONE)
return false;
if (likely(ds->ops->port_rxtstamp))
return ds->ops->port_rxtstamp(ds, p->dp->index, skb, type);
return false;
}
static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt, struct net_device *unused)
{
struct dsa_port *cpu_dp = dev->dsa_ptr;
struct sk_buff *nskb = NULL;
struct pcpu_sw_netstats *s;
struct dsa_slave_priv *p;
if (unlikely(!cpu_dp)) {
kfree_skb(skb);
return 0;
}
skb = skb_unshare(skb, GFP_ATOMIC);
if (!skb)
return 0;
nskb = cpu_dp->rcv(skb, dev, pt);
if (!nskb) {
kfree_skb(skb);
return 0;
}
skb = nskb;
p = netdev_priv(skb->dev);
skb_push(skb, ETH_HLEN);
skb->pkt_type = PACKET_HOST;
skb->protocol = eth_type_trans(skb, skb->dev);
s = this_cpu_ptr(p->stats64);
u64_stats_update_begin(&s->syncp);
s->rx_packets++;
s->rx_bytes += skb->len;
u64_stats_update_end(&s->syncp);
if (dsa_skb_defer_rx_timestamp(p, skb))
return 0;
netif_receive_skb(skb);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
{
return dsa_is_user_port(ds, p) && ds->ports[p].slave;
}
int dsa_switch_suspend(struct dsa_switch *ds)
{
int i, ret = 0;
/* Suspend slave network devices */
for (i = 0; i < ds->num_ports; i++) {
if (!dsa_is_port_initialized(ds, i))
continue;
ret = dsa_slave_suspend(ds->ports[i].slave);
if (ret)
return ret;
}
if (ds->ops->suspend)
ret = ds->ops->suspend(ds);
return ret;
}
EXPORT_SYMBOL_GPL(dsa_switch_suspend);
int dsa_switch_resume(struct dsa_switch *ds)
{
int i, ret = 0;
if (ds->ops->resume)
ret = ds->ops->resume(ds);
if (ret)
return ret;
/* Resume slave network devices */
for (i = 0; i < ds->num_ports; i++) {
if (!dsa_is_port_initialized(ds, i))
continue;
ret = dsa_slave_resume(ds->ports[i].slave);
if (ret)
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(dsa_switch_resume);
#endif
static struct packet_type dsa_pack_type __read_mostly = {
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