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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* DSA tagging protocol handling
*
* Copyright (c) 2008-2009 Marvell Semiconductor
* Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
* Copyright (c) 2016 Andrew Lunn <andrew@lunn.ch>
*/
#include <linux/netdevice.h>
#include <linux/ptp_classify.h>
#include <linux/skbuff.h>
#include <net/dsa.h>
#include <net/dst_metadata.h>
#include "slave.h"
#include "tag.h"
static LIST_HEAD(dsa_tag_drivers_list);
static DEFINE_MUTEX(dsa_tag_drivers_lock);
/* 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 (!ds->ops->port_rxtstamp)
return false;
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;
return ds->ops->port_rxtstamp(ds, p->dp->index, skb, type);
}
static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt, struct net_device *unused)
{
struct metadata_dst *md_dst = skb_metadata_dst(skb);
struct dsa_port *cpu_dp = dev->dsa_ptr;
struct sk_buff *nskb = NULL;
struct dsa_slave_priv *p;
if (unlikely(!cpu_dp)) {
kfree_skb(skb);
return 0;
}
skb = skb_unshare(skb, GFP_ATOMIC);
if (!skb)
return 0;
if (md_dst && md_dst->type == METADATA_HW_PORT_MUX) {
unsigned int port = md_dst->u.port_info.port_id;
skb_dst_drop(skb);
if (!skb_has_extensions(skb))
skb->slow_gro = 0;
skb->dev = dsa_master_find_slave(dev, 0, port);
if (likely(skb->dev)) {
dsa_default_offload_fwd_mark(skb);
nskb = skb;
}
} else {
nskb = cpu_dp->rcv(skb, dev);
}
if (!nskb) {
kfree_skb(skb);
return 0;
}
skb = nskb;
skb_push(skb, ETH_HLEN);
skb->pkt_type = PACKET_HOST;
skb->protocol = eth_type_trans(skb, skb->dev);
if (unlikely(!dsa_slave_dev_check(skb->dev))) {
/* Packet is to be injected directly on an upper
* device, e.g. a team/bond, so skip all DSA-port
* specific actions.
*/
netif_rx(skb);
return 0;
}
p = netdev_priv(skb->dev);
if (unlikely(cpu_dp->ds->untag_bridge_pvid)) {
nskb = dsa_untag_bridge_pvid(skb);
if (!nskb) {
kfree_skb(skb);
return 0;
}
skb = nskb;
}
dev_sw_netstats_rx_add(skb->dev, skb->len + ETH_HLEN);
if (dsa_skb_defer_rx_timestamp(p, skb))
return 0;
gro_cells_receive(&p->gcells, skb);
return 0;
}
struct packet_type dsa_pack_type __read_mostly = {
.type = cpu_to_be16(ETH_P_XDSA),
.func = dsa_switch_rcv,
};
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;
};
/* Function takes a reference on the module owning the tagger,
* so dsa_tag_driver_put must be called afterwards.
*/
const struct dsa_device_ops *dsa_tag_driver_get_by_name(const char *name)
{
const struct dsa_device_ops *ops = ERR_PTR(-ENOPROTOOPT);
struct dsa_tag_driver *dsa_tag_driver;
request_module("%s%s", DSA_TAG_DRIVER_ALIAS, name);
mutex_lock(&dsa_tag_drivers_lock);
list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
const struct dsa_device_ops *tmp = dsa_tag_driver->ops;
if (strcmp(name, tmp->name))
continue;
if (!try_module_get(dsa_tag_driver->owner))
break;
ops = tmp;
break;
}
mutex_unlock(&dsa_tag_drivers_lock);
return ops;
}
const struct dsa_device_ops *dsa_tag_driver_get_by_id(int tag_protocol)
{
struct dsa_tag_driver *dsa_tag_driver;
const struct dsa_device_ops *ops;
bool found = false;
request_module("%sid-%d", DSA_TAG_DRIVER_ALIAS, tag_protocol);
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);
}
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