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kernel/net/dsa/dsa.c
Florian Fainelli 6d3c8c0dd8 net: dsa: Remove master_netdev and use dst->cpu_dp->netdev 
In preparation for supporting multiple CPU ports, remove
dst->master_netdev and ds->master_netdev and replace them with only one
instance of the common object we have for a port: struct
dsa_port::netdev. ds->master_netdev is currently write only and would be
helpful in the case where we have two switches, both with CPU ports, and
also connected within each other, which the multi-CPU port patch series
would address.

While at it, introduce a helper function used in net/dsa/slave.c to
immediately get a reference on the master network device called
dsa_master_netdev().

Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-13 16:35:02 -04:00

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/*
* net/dsa/dsa.c - Hardware switch handling
* Copyright (c) 2008-2009 Marvell Semiconductor
* Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
*
* 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/device.h>
#include <linux/list.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_mdio.h>
#include <linux/of_platform.h>
#include <linux/of_net.h>
#include <linux/of_gpio.h>
#include <linux/netdevice.h>
#include <linux/sysfs.h>
#include <linux/phy_fixed.h>
#include <linux/gpio/consumer.h>
#include <linux/etherdevice.h>
#include "dsa_priv.h"
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 = {
.xmit = dsa_slave_notag_xmit,
.rcv = NULL,
};
const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
#ifdef CONFIG_NET_DSA_TAG_BRCM
[DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_DSA
[DSA_TAG_PROTO_DSA] = &dsa_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_EDSA
[DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_KSZ
[DSA_TAG_PROTO_KSZ] = &ksz_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_LAN9303
[DSA_TAG_PROTO_LAN9303] = &lan9303_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_MTK
[DSA_TAG_PROTO_MTK] = &mtk_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_QCA
[DSA_TAG_PROTO_QCA] = &qca_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_TRAILER
[DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops,
#endif
[DSA_TAG_PROTO_NONE] = &none_ops,
};
int dsa_cpu_dsa_setup(struct dsa_switch *ds, struct device *dev,
struct dsa_port *dport, int port)
{
struct device_node *port_dn = dport->dn;
struct phy_device *phydev;
int ret, mode;
if (of_phy_is_fixed_link(port_dn)) {
ret = of_phy_register_fixed_link(port_dn);
if (ret) {
dev_err(dev, "failed to register fixed PHY\n");
return ret;
}
phydev = of_phy_find_device(port_dn);
mode = of_get_phy_mode(port_dn);
if (mode < 0)
mode = PHY_INTERFACE_MODE_NA;
phydev->interface = mode;
genphy_config_init(phydev);
genphy_read_status(phydev);
if (ds->ops->adjust_link)
ds->ops->adjust_link(ds, port, phydev);
put_device(&phydev->mdio.dev);
}
return 0;
}
const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol)
{
const struct dsa_device_ops *ops;
if (tag_protocol >= DSA_TAG_LAST)
return ERR_PTR(-EINVAL);
ops = dsa_device_ops[tag_protocol];
if (!ops)
return ERR_PTR(-ENOPROTOOPT);
return ops;
}
int dsa_cpu_port_ethtool_setup(struct dsa_port *cpu_dp)
{
struct dsa_switch *ds = cpu_dp->ds;
struct net_device *master;
struct ethtool_ops *cpu_ops;
master = ds->dst->cpu_dp->netdev;
cpu_ops = devm_kzalloc(ds->dev, sizeof(*cpu_ops), GFP_KERNEL);
if (!cpu_ops)
return -ENOMEM;
memcpy(&ds->dst->master_ethtool_ops, master->ethtool_ops,
sizeof(struct ethtool_ops));
ds->dst->master_orig_ethtool_ops = master->ethtool_ops;
memcpy(cpu_ops, &ds->dst->master_ethtool_ops,
sizeof(struct ethtool_ops));
dsa_cpu_port_ethtool_init(cpu_ops);
master->ethtool_ops = cpu_ops;
return 0;
}
void dsa_cpu_port_ethtool_restore(struct dsa_port *cpu_dp)
{
struct dsa_switch *ds = cpu_dp->ds;
struct net_device *master;
master = ds->dst->cpu_dp->netdev;
master->ethtool_ops = ds->dst->master_orig_ethtool_ops;
}
void dsa_cpu_dsa_destroy(struct dsa_port *port)
{
struct device_node *port_dn = port->dn;
if (of_phy_is_fixed_link(port_dn))
of_phy_deregister_fixed_link(port_dn);
}
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);
static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt, struct net_device *orig_dev)
{
struct dsa_switch_tree *dst = dev->dsa_ptr;
struct sk_buff *nskb = NULL;
if (unlikely(dst == NULL)) {
kfree_skb(skb);
return 0;
}
skb = skb_unshare(skb, GFP_ATOMIC);
if (!skb)
return 0;
nskb = dst->rcv(skb, dev, pt, orig_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);
skb->dev->stats.rx_packets++;
skb->dev->stats.rx_bytes += skb->len;
netif_receive_skb(skb);
return 0;
}
#ifdef CONFIG_PM_SLEEP
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].netdev);
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].netdev);
if (ret)
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(dsa_switch_resume);
#endif
static struct packet_type dsa_pack_type __read_mostly = {
.type = cpu_to_be16(ETH_P_XDSA),
.func = dsa_switch_rcv,
};
static int __init dsa_init_module(void)
{
int rc;
rc = dsa_slave_register_notifier();
if (rc)
return rc;
rc = dsa_legacy_register();
if (rc)
return rc;
dev_add_pack(&dsa_pack_type);
return 0;
}
module_init(dsa_init_module);
static void __exit dsa_cleanup_module(void)
{
dsa_slave_unregister_notifier();
dev_remove_pack(&dsa_pack_type);
dsa_legacy_unregister();
}
module_exit(dsa_cleanup_module);
MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:dsa");
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