linux/net/dsa/slave.c
Lennert Buytenhek e84665c9cb dsa: add switch chip cascading support
The initial version of the DSA driver only supported a single switch
chip per network interface, while DSA-capable switch chips can be
interconnected to form a tree of switch chips.  This patch adds support
for multiple switch chips on a network interface.

An example topology for a 16-port device with an embedded CPU is as
follows:

	+-----+          +--------+       +--------+
	|     |eth0    10| switch |9    10| switch |
	| CPU +----------+        +-------+        |
	|     |          | chip 0 |       | chip 1 |
	+-----+          +---++---+       +---++---+
	                     ||               ||
	                     ||               ||
	                     ||1000baseT      ||1000baseT
	                     ||ports 1-8      ||ports 9-16

This requires a couple of interdependent changes in the DSA layer:

- The dsa platform driver data needs to be extended: there is still
  only one netdevice per DSA driver instance (eth0 in the example
  above), but each of the switch chips in the tree needs its own
  mii_bus device pointer, MII management bus address, and port name
  array. (include/net/dsa.h)  The existing in-tree dsa users need
  some small changes to deal with this. (arch/arm)

- The DSA and Ethertype DSA tagging modules need to be extended to
  use the DSA device ID field on receive and demultiplex the packet
  accordingly, and fill in the DSA device ID field on transmit
  according to which switch chip the packet is heading to.
  (net/dsa/tag_{dsa,edsa}.c)

- The concept of "CPU port", which is the switch chip port that the
  CPU is connected to (port 10 on switch chip 0 in the example), needs
  to be extended with the concept of "upstream port", which is the
  port on the switch chip that will bring us one hop closer to the CPU
  (port 10 for both switch chips in the example above).

- The dsa platform data needs to specify which ports on which switch
  chips are links to other switch chips, so that we can enable DSA
  tagging mode on them.  (For inter-switch links, we always use
  non-EtherType DSA tagging, since it has lower overhead.  The CPU
  link uses dsa or edsa tagging depending on what the 'root' switch
  chip supports.)  This is done by specifying "dsa" for the given
  port in the port array.

- The dsa platform data needs to be extended with information on via
  which port to reach any given switch chip from any given switch chip.
  This info is specified via the per-switch chip data struct ->rtable[]
  array, which gives the nexthop ports for each of the other switches
  in the tree.

For the example topology above, the dsa platform data would look
something like this:

	static struct dsa_chip_data sw[2] = {
		{
			.mii_bus	= &foo,
			.sw_addr	= 1,
			.port_names[0]	= "p1",
			.port_names[1]	= "p2",
			.port_names[2]	= "p3",
			.port_names[3]	= "p4",
			.port_names[4]	= "p5",
			.port_names[5]	= "p6",
			.port_names[6]	= "p7",
			.port_names[7]	= "p8",
			.port_names[9]	= "dsa",
			.port_names[10]	= "cpu",
			.rtable		= (s8 []){ -1, 9, },
		}, {
			.mii_bus	= &foo,
			.sw_addr	= 2,
			.port_names[0]	= "p9",
			.port_names[1]	= "p10",
			.port_names[2]	= "p11",
			.port_names[3]	= "p12",
			.port_names[4]	= "p13",
			.port_names[5]	= "p14",
			.port_names[6]	= "p15",
			.port_names[7]	= "p16",
			.port_names[10]	= "dsa",
			.rtable		= (s8 []){ 10, -1, },
		},
	},

	static struct dsa_platform_data pd = {
		.netdev		= &foo,
		.nr_switches	= 2,
		.sw		= sw,
	};

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Tested-by: Gary Thomas <gary@mlbassoc.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-03-21 19:06:54 -07:00

410 lines
10 KiB
C

/*
* net/dsa/slave.c - Slave device handling
* Copyright (c) 2008-2009 Marvell Semiconductor
*
* 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/list.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/phy.h>
#include "dsa_priv.h"
/* slave mii_bus handling ***************************************************/
static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
{
struct dsa_switch *ds = bus->priv;
if (ds->phys_port_mask & (1 << addr))
return ds->drv->phy_read(ds, addr, reg);
return 0xffff;
}
static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
{
struct dsa_switch *ds = bus->priv;
if (ds->phys_port_mask & (1 << addr))
return ds->drv->phy_write(ds, addr, reg, val);
return 0;
}
void dsa_slave_mii_bus_init(struct dsa_switch *ds)
{
ds->slave_mii_bus->priv = (void *)ds;
ds->slave_mii_bus->name = "dsa slave smi";
ds->slave_mii_bus->read = dsa_slave_phy_read;
ds->slave_mii_bus->write = dsa_slave_phy_write;
snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "%s:%.2x",
ds->master_mii_bus->id, ds->pd->sw_addr);
ds->slave_mii_bus->parent = &ds->master_mii_bus->dev;
}
/* slave device handling ****************************************************/
static int dsa_slave_init(struct net_device *dev)
{
struct dsa_slave_priv *p = netdev_priv(dev);
dev->iflink = p->parent->dst->master_netdev->ifindex;
return 0;
}
static int dsa_slave_open(struct net_device *dev)
{
struct dsa_slave_priv *p = netdev_priv(dev);
struct net_device *master = p->parent->dst->master_netdev;
int err;
if (!(master->flags & IFF_UP))
return -ENETDOWN;
if (compare_ether_addr(dev->dev_addr, master->dev_addr)) {
err = dev_unicast_add(master, dev->dev_addr, ETH_ALEN);
if (err < 0)
goto out;
}
if (dev->flags & IFF_ALLMULTI) {
err = dev_set_allmulti(master, 1);
if (err < 0)
goto del_unicast;
}
if (dev->flags & IFF_PROMISC) {
err = dev_set_promiscuity(master, 1);
if (err < 0)
goto clear_allmulti;
}
return 0;
clear_allmulti:
if (dev->flags & IFF_ALLMULTI)
dev_set_allmulti(master, -1);
del_unicast:
if (compare_ether_addr(dev->dev_addr, master->dev_addr))
dev_unicast_delete(master, dev->dev_addr, ETH_ALEN);
out:
return err;
}
static int dsa_slave_close(struct net_device *dev)
{
struct dsa_slave_priv *p = netdev_priv(dev);
struct net_device *master = p->parent->dst->master_netdev;
dev_mc_unsync(master, dev);
dev_unicast_unsync(master, dev);
if (dev->flags & IFF_ALLMULTI)
dev_set_allmulti(master, -1);
if (dev->flags & IFF_PROMISC)
dev_set_promiscuity(master, -1);
if (compare_ether_addr(dev->dev_addr, master->dev_addr))
dev_unicast_delete(master, dev->dev_addr, ETH_ALEN);
return 0;
}
static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
{
struct dsa_slave_priv *p = netdev_priv(dev);
struct net_device *master = p->parent->dst->master_netdev;
if (change & IFF_ALLMULTI)
dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
if (change & IFF_PROMISC)
dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
}
static void dsa_slave_set_rx_mode(struct net_device *dev)
{
struct dsa_slave_priv *p = netdev_priv(dev);
struct net_device *master = p->parent->dst->master_netdev;
dev_mc_sync(master, dev);
dev_unicast_sync(master, dev);
}
static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
{
struct dsa_slave_priv *p = netdev_priv(dev);
struct net_device *master = p->parent->dst->master_netdev;
struct sockaddr *addr = a;
int err;
if (!is_valid_ether_addr(addr->sa_data))
return -EADDRNOTAVAIL;
if (!(dev->flags & IFF_UP))
goto out;
if (compare_ether_addr(addr->sa_data, master->dev_addr)) {
err = dev_unicast_add(master, addr->sa_data, ETH_ALEN);
if (err < 0)
return err;
}
if (compare_ether_addr(dev->dev_addr, master->dev_addr))
dev_unicast_delete(master, dev->dev_addr, ETH_ALEN);
out:
memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
return 0;
}
static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
struct dsa_slave_priv *p = netdev_priv(dev);
struct mii_ioctl_data *mii_data = if_mii(ifr);
if (p->phy != NULL)
return phy_mii_ioctl(p->phy, mii_data, cmd);
return -EOPNOTSUPP;
}
/* ethtool operations *******************************************************/
static int
dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
struct dsa_slave_priv *p = netdev_priv(dev);
int err;
err = -EOPNOTSUPP;
if (p->phy != NULL) {
err = phy_read_status(p->phy);
if (err == 0)
err = phy_ethtool_gset(p->phy, cmd);
}
return err;
}
static int
dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
struct dsa_slave_priv *p = netdev_priv(dev);
if (p->phy != NULL)
return phy_ethtool_sset(p->phy, cmd);
return -EOPNOTSUPP;
}
static void dsa_slave_get_drvinfo(struct net_device *dev,
struct ethtool_drvinfo *drvinfo)
{
strncpy(drvinfo->driver, "dsa", 32);
strncpy(drvinfo->version, dsa_driver_version, 32);
strncpy(drvinfo->fw_version, "N/A", 32);
strncpy(drvinfo->bus_info, "platform", 32);
}
static int dsa_slave_nway_reset(struct net_device *dev)
{
struct dsa_slave_priv *p = netdev_priv(dev);
if (p->phy != NULL)
return genphy_restart_aneg(p->phy);
return -EOPNOTSUPP;
}
static u32 dsa_slave_get_link(struct net_device *dev)
{
struct dsa_slave_priv *p = netdev_priv(dev);
if (p->phy != NULL) {
genphy_update_link(p->phy);
return p->phy->link;
}
return -EOPNOTSUPP;
}
static void dsa_slave_get_strings(struct net_device *dev,
uint32_t stringset, uint8_t *data)
{
struct dsa_slave_priv *p = netdev_priv(dev);
struct dsa_switch *ds = p->parent;
if (stringset == ETH_SS_STATS) {
int len = ETH_GSTRING_LEN;
strncpy(data, "tx_packets", len);
strncpy(data + len, "tx_bytes", len);
strncpy(data + 2 * len, "rx_packets", len);
strncpy(data + 3 * len, "rx_bytes", len);
if (ds->drv->get_strings != NULL)
ds->drv->get_strings(ds, p->port, data + 4 * len);
}
}
static void dsa_slave_get_ethtool_stats(struct net_device *dev,
struct ethtool_stats *stats,
uint64_t *data)
{
struct dsa_slave_priv *p = netdev_priv(dev);
struct dsa_switch *ds = p->parent;
data[0] = p->dev->stats.tx_packets;
data[1] = p->dev->stats.tx_bytes;
data[2] = p->dev->stats.rx_packets;
data[3] = p->dev->stats.rx_bytes;
if (ds->drv->get_ethtool_stats != NULL)
ds->drv->get_ethtool_stats(ds, p->port, data + 4);
}
static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
{
struct dsa_slave_priv *p = netdev_priv(dev);
struct dsa_switch *ds = p->parent;
if (sset == ETH_SS_STATS) {
int count;
count = 4;
if (ds->drv->get_sset_count != NULL)
count += ds->drv->get_sset_count(ds);
return count;
}
return -EOPNOTSUPP;
}
static const struct ethtool_ops dsa_slave_ethtool_ops = {
.get_settings = dsa_slave_get_settings,
.set_settings = dsa_slave_set_settings,
.get_drvinfo = dsa_slave_get_drvinfo,
.nway_reset = dsa_slave_nway_reset,
.get_link = dsa_slave_get_link,
.set_sg = ethtool_op_set_sg,
.get_strings = dsa_slave_get_strings,
.get_ethtool_stats = dsa_slave_get_ethtool_stats,
.get_sset_count = dsa_slave_get_sset_count,
};
#ifdef CONFIG_NET_DSA_TAG_DSA
static const struct net_device_ops dsa_netdev_ops = {
.ndo_init = dsa_slave_init,
.ndo_open = dsa_slave_open,
.ndo_stop = dsa_slave_close,
.ndo_start_xmit = dsa_xmit,
.ndo_change_rx_flags = dsa_slave_change_rx_flags,
.ndo_set_rx_mode = dsa_slave_set_rx_mode,
.ndo_set_multicast_list = dsa_slave_set_rx_mode,
.ndo_set_mac_address = dsa_slave_set_mac_address,
.ndo_do_ioctl = dsa_slave_ioctl,
};
#endif
#ifdef CONFIG_NET_DSA_TAG_EDSA
static const struct net_device_ops edsa_netdev_ops = {
.ndo_init = dsa_slave_init,
.ndo_open = dsa_slave_open,
.ndo_stop = dsa_slave_close,
.ndo_start_xmit = edsa_xmit,
.ndo_change_rx_flags = dsa_slave_change_rx_flags,
.ndo_set_rx_mode = dsa_slave_set_rx_mode,
.ndo_set_multicast_list = dsa_slave_set_rx_mode,
.ndo_set_mac_address = dsa_slave_set_mac_address,
.ndo_do_ioctl = dsa_slave_ioctl,
};
#endif
#ifdef CONFIG_NET_DSA_TAG_TRAILER
static const struct net_device_ops trailer_netdev_ops = {
.ndo_init = dsa_slave_init,
.ndo_open = dsa_slave_open,
.ndo_stop = dsa_slave_close,
.ndo_start_xmit = trailer_xmit,
.ndo_change_rx_flags = dsa_slave_change_rx_flags,
.ndo_set_rx_mode = dsa_slave_set_rx_mode,
.ndo_set_multicast_list = dsa_slave_set_rx_mode,
.ndo_set_mac_address = dsa_slave_set_mac_address,
.ndo_do_ioctl = dsa_slave_ioctl,
};
#endif
/* slave device setup *******************************************************/
struct net_device *
dsa_slave_create(struct dsa_switch *ds, struct device *parent,
int port, char *name)
{
struct net_device *master = ds->dst->master_netdev;
struct net_device *slave_dev;
struct dsa_slave_priv *p;
int ret;
slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv),
name, ether_setup);
if (slave_dev == NULL)
return slave_dev;
slave_dev->features = master->vlan_features;
SET_ETHTOOL_OPS(slave_dev, &dsa_slave_ethtool_ops);
memcpy(slave_dev->dev_addr, master->dev_addr, ETH_ALEN);
slave_dev->tx_queue_len = 0;
switch (ds->dst->tag_protocol) {
#ifdef CONFIG_NET_DSA_TAG_DSA
case htons(ETH_P_DSA):
slave_dev->netdev_ops = &dsa_netdev_ops;
break;
#endif
#ifdef CONFIG_NET_DSA_TAG_EDSA
case htons(ETH_P_EDSA):
slave_dev->netdev_ops = &edsa_netdev_ops;
break;
#endif
#ifdef CONFIG_NET_DSA_TAG_TRAILER
case htons(ETH_P_TRAILER):
slave_dev->netdev_ops = &trailer_netdev_ops;
break;
#endif
default:
BUG();
}
SET_NETDEV_DEV(slave_dev, parent);
slave_dev->vlan_features = master->vlan_features;
p = netdev_priv(slave_dev);
p->dev = slave_dev;
p->parent = ds;
p->port = port;
p->phy = ds->slave_mii_bus->phy_map[port];
ret = register_netdev(slave_dev);
if (ret) {
printk(KERN_ERR "%s: error %d registering interface %s\n",
master->name, ret, slave_dev->name);
free_netdev(slave_dev);
return NULL;
}
netif_carrier_off(slave_dev);
if (p->phy != NULL) {
phy_attach(slave_dev, dev_name(&p->phy->dev),
0, PHY_INTERFACE_MODE_GMII);
p->phy->autoneg = AUTONEG_ENABLE;
p->phy->speed = 0;
p->phy->duplex = 0;
p->phy->advertising = p->phy->supported | ADVERTISED_Autoneg;
phy_start_aneg(p->phy);
}
return slave_dev;
}