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net: dsa: Plug in PHYLINK support

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Add support for PHYLINK within the DSA subsystem in order to support more
complex devices such as pluggable (SFP) and non-pluggable (SFF) modules, 10G
PHYs, and traditional PHYs. Using PHYLINK allows us to drop some amount of
complexity we had while probing fixed and non-fixed PHYs using Device Tree.

Because PHYLINK separates the Ethernet MAC/port configuration into different
stages, we let switch drivers implement those, and for now, we maintain
functionality by calling dsa_slave_adjust_link() during
phylink_mac_link_{up,down} which provides semantically equivalent steps.

Drivers willing to take advantage of PHYLINK should implement the phylink_mac_*
operations that DSA wraps.

We cannot quite remove the adjust_link() callback just yet, because a number of
drivers rely on that for configuring their "CPU" and "DSA" ports, this is done
dsa_port_setup_phy_of() and dsa_port_fixed_link_register_of() still.

Drivers that utilize fixed links for user-facing ports (e.g: bcm_sf2) will need
to implement phylink_mac_ops from now on to preserve functionality, since PHYLINK
*does not* create a phy_device instance for fixed links.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2018-05-10 13:17:36 -07:00 committed by David S. Miller
parent c9a2356f35
commit aab9c4067d
3 changed files with 175 additions and 135 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/net/dsa.h
View File

@ -201,6 +201,7 @@ struct dsa_port {
u8 stp_state;
struct net_device *bridge_dev;
struct devlink_port devlink_port;
struct phylink *pl;
/*
* Original copy of the master netdev ethtool_ops
*/

9
net/dsa/dsa_priv.h
View File

@ -75,15 +75,6 @@ struct dsa_slave_priv {
/* DSA port data, such as switch, port index, etc. */
struct dsa_port *dp;
/*
* The phylib phy_device pointer for the PHY connected
* to this port.
*/
phy_interface_t phy_interface;
int old_link;
int old_pause;
int old_duplex;
#ifdef CONFIG_NET_POLL_CONTROLLER
struct netpoll *netpoll;
#endif

300
net/dsa/slave.c
View File

@ -13,6 +13,7 @@
#include <linux/netdevice.h>
#include <linux/phy.h>
#include <linux/phy_fixed.h>
#include <linux/phylink.h>
#include <linux/of_net.h>
#include <linux/of_mdio.h>
#include <linux/mdio.h>
@ -97,8 +98,7 @@ static int dsa_slave_open(struct net_device *dev)
if (err)
goto clear_promisc;
if (dev->phydev)
phy_start(dev->phydev);
phylink_start(dp->pl);
return 0;
@ -120,8 +120,7 @@ static int dsa_slave_close(struct net_device *dev)
struct net_device *master = dsa_slave_to_master(dev);
struct dsa_port *dp = dsa_slave_to_port(dev);
if (dev->phydev)
phy_stop(dev->phydev);
phylink_stop(dp->pl);
dsa_port_disable(dp, dev->phydev);
@ -272,10 +271,7 @@ static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
break;
}
if (!dev->phydev)
return -ENODEV;
return phy_mii_ioctl(dev->phydev, ifr, cmd);
return phylink_mii_ioctl(p->dp->pl, ifr, cmd);
}
static int dsa_slave_port_attr_set(struct net_device *dev,
@ -498,6 +494,13 @@ dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
ds->ops->get_regs(ds, dp->index, regs, _p);
}
static int dsa_slave_nway_reset(struct net_device *dev)
{
struct dsa_port *dp = dsa_slave_to_port(dev);
return phylink_ethtool_nway_reset(dp->pl);
}
static int dsa_slave_get_eeprom_len(struct net_device *dev)
{
struct dsa_port *dp = dsa_slave_to_port(dev);
@ -609,6 +612,8 @@ static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
struct dsa_port *dp = dsa_slave_to_port(dev);
struct dsa_switch *ds = dp->ds;
phylink_ethtool_get_wol(dp->pl, w);
if (ds->ops->get_wol)
ds->ops->get_wol(ds, dp->index, w);
}
@ -619,6 +624,8 @@ static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
struct dsa_switch *ds = dp->ds;
int ret = -EOPNOTSUPP;
phylink_ethtool_set_wol(dp->pl, w);
if (ds->ops->set_wol)
ret = ds->ops->set_wol(ds, dp->index, w);
@ -642,13 +649,7 @@ static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
if (ret)
return ret;
if (e->eee_enabled) {
ret = phy_init_eee(dev->phydev, 0);
if (ret)
return ret;
}
return phy_ethtool_set_eee(dev->phydev, e);
return phylink_ethtool_set_eee(dp->pl, e);
}
static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
@ -668,7 +669,23 @@ static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
if (ret)
return ret;
return phy_ethtool_get_eee(dev->phydev, e);
return phylink_ethtool_get_eee(dp->pl, e);
}
static int dsa_slave_get_link_ksettings(struct net_device *dev,
struct ethtool_link_ksettings *cmd)
{
struct dsa_port *dp = dsa_slave_to_port(dev);
return phylink_ethtool_ksettings_get(dp->pl, cmd);
}
static int dsa_slave_set_link_ksettings(struct net_device *dev,
const struct ethtool_link_ksettings *cmd)
{
struct dsa_port *dp = dsa_slave_to_port(dev);
return phylink_ethtool_ksettings_set(dp->pl, cmd);
}
#ifdef CONFIG_NET_POLL_CONTROLLER
@ -971,7 +988,7 @@ static const struct ethtool_ops dsa_slave_ethtool_ops = {
.get_drvinfo = dsa_slave_get_drvinfo,
.get_regs_len = dsa_slave_get_regs_len,
.get_regs = dsa_slave_get_regs,
.nway_reset = phy_ethtool_nway_reset,
.nway_reset = dsa_slave_nway_reset,
.get_link = ethtool_op_get_link,
.get_eeprom_len = dsa_slave_get_eeprom_len,
.get_eeprom = dsa_slave_get_eeprom,
@ -983,8 +1000,8 @@ static const struct ethtool_ops dsa_slave_ethtool_ops = {
.get_wol = dsa_slave_get_wol,
.set_eee = dsa_slave_set_eee,
.get_eee = dsa_slave_get_eee,
.get_link_ksettings = phy_ethtool_get_link_ksettings,
.set_link_ksettings = phy_ethtool_set_link_ksettings,
.get_link_ksettings = dsa_slave_get_link_ksettings,
.set_link_ksettings = dsa_slave_set_link_ksettings,
.get_rxnfc = dsa_slave_get_rxnfc,
.set_rxnfc = dsa_slave_set_rxnfc,
.get_ts_info = dsa_slave_get_ts_info,
@ -1043,56 +1060,122 @@ static struct device_type dsa_type = {
.name = "dsa",
};
static void dsa_slave_adjust_link(struct net_device *dev)
static void dsa_slave_phylink_validate(struct net_device *dev,
unsigned long *supported,
struct phylink_link_state *state)
{
struct dsa_port *dp = dsa_slave_to_port(dev);
struct dsa_slave_priv *p = netdev_priv(dev);
struct dsa_switch *ds = dp->ds;
unsigned int status_changed = 0;
if (p->old_link != dev->phydev->link) {
status_changed = 1;
p->old_link = dev->phydev->link;
}
if (!ds->ops->phylink_validate)
return;
if (p->old_duplex != dev->phydev->duplex) {
status_changed = 1;
p->old_duplex = dev->phydev->duplex;
}
if (p->old_pause != dev->phydev->pause) {
status_changed = 1;
p->old_pause = dev->phydev->pause;
}
if (ds->ops->adjust_link && status_changed)
ds->ops->adjust_link(ds, dp->index, dev->phydev);
if (status_changed)
phy_print_status(dev->phydev);
ds->ops->phylink_validate(ds, dp->index, supported, state);
}
static int dsa_slave_fixed_link_update(struct net_device *dev,
struct fixed_phy_status *status)
static int dsa_slave_phylink_mac_link_state(struct net_device *dev,
struct phylink_link_state *state)
{
struct dsa_switch *ds;
struct dsa_port *dp;
struct dsa_port *dp = dsa_slave_to_port(dev);
struct dsa_switch *ds = dp->ds;
if (dev) {
dp = dsa_slave_to_port(dev);
ds = dp->ds;
if (ds->ops->fixed_link_update)
ds->ops->fixed_link_update(ds, dp->index, status);
/* Only called for SGMII and 802.3z */
if (!ds->ops->phylink_mac_link_state)
return -EOPNOTSUPP;
return ds->ops->phylink_mac_link_state(ds, dp->index, state);
}
static void dsa_slave_phylink_mac_config(struct net_device *dev,
unsigned int mode,
const struct phylink_link_state *state)
{
struct dsa_port *dp = dsa_slave_to_port(dev);
struct dsa_switch *ds = dp->ds;
if (!ds->ops->phylink_mac_config)
return;
ds->ops->phylink_mac_config(ds, dp->index, mode, state);
}
static void dsa_slave_phylink_mac_an_restart(struct net_device *dev)
{
struct dsa_port *dp = dsa_slave_to_port(dev);
struct dsa_switch *ds = dp->ds;
if (!ds->ops->phylink_mac_an_restart)
return;
ds->ops->phylink_mac_an_restart(ds, dp->index);
}
static void dsa_slave_phylink_mac_link_down(struct net_device *dev,
unsigned int mode,
phy_interface_t interface)
{
struct dsa_port *dp = dsa_slave_to_port(dev);
struct dsa_switch *ds = dp->ds;
if (!ds->ops->phylink_mac_link_down) {
if (ds->ops->adjust_link && dev->phydev)
ds->ops->adjust_link(ds, dp->index, dev->phydev);
return;
}
return 0;
ds->ops->phylink_mac_link_down(ds, dp->index, mode, interface);
}
static void dsa_slave_phylink_mac_link_up(struct net_device *dev,
unsigned int mode,
phy_interface_t interface,
struct phy_device *phydev)
{
struct dsa_port *dp = dsa_slave_to_port(dev);
struct dsa_switch *ds = dp->ds;
if (!ds->ops->phylink_mac_link_up) {
if (ds->ops->adjust_link && dev->phydev)
ds->ops->adjust_link(ds, dp->index, dev->phydev);
return;
}
ds->ops->phylink_mac_link_up(ds, dp->index, mode, interface, phydev);
}
static const struct phylink_mac_ops dsa_slave_phylink_mac_ops = {
.validate = dsa_slave_phylink_validate,
.mac_link_state = dsa_slave_phylink_mac_link_state,
.mac_config = dsa_slave_phylink_mac_config,
.mac_an_restart = dsa_slave_phylink_mac_an_restart,
.mac_link_down = dsa_slave_phylink_mac_link_down,
.mac_link_up = dsa_slave_phylink_mac_link_up,
};
void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
{
const struct dsa_port *dp = dsa_to_port(ds, port);
phylink_mac_change(dp->pl, up);
}
EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
static void dsa_slave_phylink_fixed_state(struct net_device *dev,
struct phylink_link_state *state)
{
struct dsa_port *dp = dsa_slave_to_port(dev);
struct dsa_switch *ds = dp->ds;
/* No need to check that this operation is valid, the callback would
* not be called if it was not.
*/
ds->ops->phylink_fixed_state(ds, dp->index, state);
}
/* slave device setup *******************************************************/
static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
{
struct dsa_port *dp = dsa_slave_to_port(slave_dev);
struct dsa_slave_priv *p = netdev_priv(slave_dev);
struct dsa_switch *ds = dp->ds;
slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
@ -1101,80 +1184,54 @@ static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr)
return -ENODEV;
}
/* Use already configured phy mode */
if (p->phy_interface == PHY_INTERFACE_MODE_NA)
p->phy_interface = slave_dev->phydev->interface;
return phy_connect_direct(slave_dev, slave_dev->phydev,
dsa_slave_adjust_link, p->phy_interface);
return phylink_connect_phy(dp->pl, slave_dev->phydev);
}
void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
{
}
EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
static int dsa_slave_phy_setup(struct net_device *slave_dev)
{
struct dsa_port *dp = dsa_slave_to_port(slave_dev);
struct dsa_slave_priv *p = netdev_priv(slave_dev);
struct device_node *port_dn = dp->dn;
struct dsa_switch *ds = dp->ds;
struct device_node *phy_dn;
bool phy_is_fixed = false;
u32 phy_flags = 0;
int mode, ret;
mode = of_get_phy_mode(port_dn);
if (mode < 0)
mode = PHY_INTERFACE_MODE_NA;
p->phy_interface = mode;
phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
if (!phy_dn && of_phy_is_fixed_link(port_dn)) {
/* In the case of a fixed PHY, the DT node associated
* to the fixed PHY is the Port DT node
*/
ret = of_phy_register_fixed_link(port_dn);
if (ret) {
netdev_err(slave_dev, "failed to register fixed PHY: %d\n", ret);
return ret;
}
phy_is_fixed = true;
phy_dn = of_node_get(port_dn);
dp->pl = phylink_create(slave_dev, of_fwnode_handle(port_dn), mode,
&dsa_slave_phylink_mac_ops);
if (IS_ERR(dp->pl)) {
netdev_err(slave_dev,
"error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
return PTR_ERR(dp->pl);
}
/* Register only if the switch provides such a callback, since this
* callback takes precedence over polling the link GPIO in PHYLINK
* (see phylink_get_fixed_state).
*/
if (ds->ops->phylink_fixed_state)
phylink_fixed_state_cb(dp->pl, dsa_slave_phylink_fixed_state);
if (ds->ops->get_phy_flags)
phy_flags = ds->ops->get_phy_flags(ds, dp->index);
if (phy_dn) {
slave_dev->phydev = of_phy_connect(slave_dev, phy_dn,
dsa_slave_adjust_link,
phy_flags,
p->phy_interface);
of_node_put(phy_dn);
}
if (slave_dev->phydev && phy_is_fixed)
fixed_phy_set_link_update(slave_dev->phydev,
dsa_slave_fixed_link_update);
/* We could not connect to a designated PHY, so use the switch internal
* MDIO bus instead
*/
if (!slave_dev->phydev) {
ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
if (ret == -ENODEV) {
/* We could not connect to a designated PHY or SFP, so use the
* switch internal MDIO bus instead
*/
ret = dsa_slave_phy_connect(slave_dev, dp->index);
if (ret) {
netdev_err(slave_dev, "failed to connect to port %d: %d\n",
netdev_err(slave_dev,
"failed to connect to port %d: %d\n",
dp->index, ret);
if (phy_is_fixed)
of_phy_deregister_fixed_link(port_dn);
phylink_destroy(dp->pl);
return ret;
}
}
phy_attached_info(slave_dev->phydev);
return 0;
}
@ -1189,29 +1246,26 @@ static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
int dsa_slave_suspend(struct net_device *slave_dev)
{
struct dsa_slave_priv *p = netdev_priv(slave_dev);
struct dsa_port *dp = dsa_slave_to_port(slave_dev);
netif_device_detach(slave_dev);
if (slave_dev->phydev) {
phy_stop(slave_dev->phydev);
p->old_pause = -1;
p->old_link = -1;
p->old_duplex = -1;
phy_suspend(slave_dev->phydev);
}
rtnl_lock();
phylink_stop(dp->pl);
rtnl_unlock();
return 0;
}
int dsa_slave_resume(struct net_device *slave_dev)
{
struct dsa_port *dp = dsa_slave_to_port(slave_dev);
netif_device_attach(slave_dev);
if (slave_dev->phydev) {
phy_resume(slave_dev->phydev);
phy_start(slave_dev->phydev);
}
rtnl_lock();
phylink_start(dp->pl);
rtnl_unlock();
return 0;
}
@ -1276,11 +1330,6 @@ int dsa_slave_create(struct dsa_port *port)
p->dp = port;
INIT_LIST_HEAD(&p->mall_tc_list);
p->xmit = cpu_dp->tag_ops->xmit;
p->old_pause = -1;
p->old_link = -1;
p->old_duplex = -1;
port->slave = slave_dev;
netif_carrier_off(slave_dev);
@ -1303,9 +1352,10 @@ int dsa_slave_create(struct dsa_port *port)
return 0;
out_phy:
phy_disconnect(slave_dev->phydev);
if (of_phy_is_fixed_link(port->dn))
of_phy_deregister_fixed_link(port->dn);
rtnl_lock();
phylink_disconnect_phy(p->dp->pl);
rtnl_unlock();
phylink_destroy(p->dp->pl);
out_free:
free_percpu(p->stats64);
free_netdev(slave_dev);
@ -1317,17 +1367,15 @@ void dsa_slave_destroy(struct net_device *slave_dev)
{
struct dsa_port *dp = dsa_slave_to_port(slave_dev);
struct dsa_slave_priv *p = netdev_priv(slave_dev);
struct device_node *port_dn = dp->dn;
netif_carrier_off(slave_dev);
if (slave_dev->phydev) {
phy_disconnect(slave_dev->phydev);
rtnl_lock();
phylink_disconnect_phy(dp->pl);
rtnl_unlock();
if (of_phy_is_fixed_link(port_dn))
of_phy_deregister_fixed_link(port_dn);
}
dsa_slave_notify(slave_dev, DSA_PORT_UNREGISTER);
unregister_netdev(slave_dev);
phylink_destroy(dp->pl);
free_percpu(p->stats64);
free_netdev(slave_dev);
}