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sfp: add sfp-bus to bridge between network devices and sfp cages

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Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Russell King
2017-07-25 15:03:18 +01:00
committed by David S. Miller
parent 9525ae8395
commit ce0aa27ff3
5 changed files with 1097 additions and 0 deletions
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3
drivers/net/phy/Makefile
View File

@@ -38,6 +38,9 @@ obj-$(CONFIG_MDIO_SUN4I) += mdio-sun4i.o
obj-$(CONFIG_MDIO_THUNDER) += mdio-thunder.o
obj-$(CONFIG_MDIO_XGENE) += mdio-xgene.o
sfp-obj-$(CONFIG_SFP) += sfp-bus.o
obj-y += $(sfp-obj-y) $(sfp-obj-m)
obj-$(CONFIG_AMD_PHY) += amd.o
obj-$(CONFIG_AQUANTIA_PHY) += aquantia.o
obj-$(CONFIG_AT803X_PHY) += at803x.o

157
drivers/net/phy/phylink.c
View File

@@ -21,6 +21,7 @@
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include "sfp.h"
#include "swphy.h"
#define SUPPORTED_INTERFACES \
@@ -32,6 +33,7 @@
enum {
PHYLINK_DISABLE_STOPPED,
PHYLINK_DISABLE_LINK,
};
struct phylink {
@@ -54,6 +56,8 @@ struct phylink {
struct work_struct resolve;
bool mac_link_dropped;
struct sfp_bus *sfp_bus;
};
static inline void linkmode_zero(unsigned long *dst)
@@ -466,6 +470,24 @@ static void phylink_run_resolve(struct phylink *pl)
queue_work(system_power_efficient_wq, &pl->resolve);
}
static const struct sfp_upstream_ops sfp_phylink_ops;
static int phylink_register_sfp(struct phylink *pl, struct device_node *np)
{
struct device_node *sfp_np;
sfp_np = of_parse_phandle(np, "sfp", 0);
if (!sfp_np)
return 0;
pl->sfp_bus = sfp_register_upstream(sfp_np, pl->netdev, pl,
&sfp_phylink_ops);
if (!pl->sfp_bus)
return -ENOMEM;
return 0;
}
struct phylink *phylink_create(struct net_device *ndev, struct device_node *np,
phy_interface_t iface, const struct phylink_mac_ops *ops)
{
@@ -507,12 +529,21 @@ struct phylink *phylink_create(struct net_device *ndev, struct device_node *np,
}
}
ret = phylink_register_sfp(pl, np);
if (ret < 0) {
kfree(pl);
return ERR_PTR(ret);
}
return pl;
}
EXPORT_SYMBOL_GPL(phylink_create);
void phylink_destroy(struct phylink *pl)
{
if (pl->sfp_bus)
sfp_unregister_upstream(pl->sfp_bus);
cancel_work_sync(&pl->resolve);
kfree(pl);
}
@@ -706,6 +737,8 @@ void phylink_start(struct phylink *pl)
clear_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
phylink_run_resolve(pl);
if (pl->sfp_bus)
sfp_upstream_start(pl->sfp_bus);
if (pl->phydev)
phy_start(pl->phydev);
}
@@ -717,6 +750,8 @@ void phylink_stop(struct phylink *pl)
if (pl->phydev)
phy_stop(pl->phydev);
if (pl->sfp_bus)
sfp_upstream_stop(pl->sfp_bus);
set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
flush_work(&pl->resolve);
@@ -1166,4 +1201,126 @@ int phylink_mii_ioctl(struct phylink *pl, struct ifreq *ifr, int cmd)
}
EXPORT_SYMBOL_GPL(phylink_mii_ioctl);
static int phylink_sfp_module_insert(void *upstream,
const struct sfp_eeprom_id *id)
{
struct phylink *pl = upstream;
__ETHTOOL_DECLARE_LINK_MODE_MASK(support) = { 0, };
struct phylink_link_state config;
phy_interface_t iface;
int mode, ret = 0;
bool changed;
u8 port;
sfp_parse_support(pl->sfp_bus, id, support);
port = sfp_parse_port(pl->sfp_bus, id, support);
iface = sfp_parse_interface(pl->sfp_bus, id);
WARN_ON(!lockdep_rtnl_is_held());
switch (iface) {
case PHY_INTERFACE_MODE_SGMII:
mode = MLO_AN_SGMII;
break;
case PHY_INTERFACE_MODE_1000BASEX:
mode = MLO_AN_8023Z;
break;
default:
return -EINVAL;
}
memset(&config, 0, sizeof(config));
linkmode_copy(config.advertising, support);
config.interface = iface;
config.speed = SPEED_UNKNOWN;
config.duplex = DUPLEX_UNKNOWN;
config.pause = MLO_PAUSE_AN;
config.an_enabled = pl->link_config.an_enabled;
/* Ignore errors if we're expecting a PHY to attach later */
ret = phylink_validate(pl, support, &config);
if (ret) {
netdev_err(pl->netdev, "validation of %s/%s with support %*pb failed: %d\n",
phylink_an_mode_str(mode), phy_modes(config.interface),
__ETHTOOL_LINK_MODE_MASK_NBITS, support, ret);
return ret;
}
netdev_dbg(pl->netdev, "requesting link mode %s/%s with support %*pb\n",
phylink_an_mode_str(mode), phy_modes(config.interface),
__ETHTOOL_LINK_MODE_MASK_NBITS, support);
if (mode == MLO_AN_8023Z && pl->phydev)
return -EINVAL;
changed = !bitmap_equal(pl->supported, support,
__ETHTOOL_LINK_MODE_MASK_NBITS);
if (changed) {
linkmode_copy(pl->supported, support);
linkmode_copy(pl->link_config.advertising, config.advertising);
}
if (pl->link_an_mode != mode ||
pl->link_config.interface != config.interface) {
pl->link_config.interface = config.interface;
pl->link_an_mode = mode;
changed = true;
netdev_info(pl->netdev, "switched to %s/%s link mode\n",
phylink_an_mode_str(mode),
phy_modes(config.interface));
}
pl->link_port = port;
if (changed && !test_bit(PHYLINK_DISABLE_STOPPED,
&pl->phylink_disable_state))
phylink_mac_config(pl, &pl->link_config);
return ret;
}
static void phylink_sfp_link_down(void *upstream)
{
struct phylink *pl = upstream;
WARN_ON(!lockdep_rtnl_is_held());
set_bit(PHYLINK_DISABLE_LINK, &pl->phylink_disable_state);
flush_work(&pl->resolve);
netif_carrier_off(pl->netdev);
}
static void phylink_sfp_link_up(void *upstream)
{
struct phylink *pl = upstream;
WARN_ON(!lockdep_rtnl_is_held());
clear_bit(PHYLINK_DISABLE_LINK, &pl->phylink_disable_state);
phylink_run_resolve(pl);
}
static int phylink_sfp_connect_phy(void *upstream, struct phy_device *phy)
{
return phylink_connect_phy(upstream, phy);
}
static void phylink_sfp_disconnect_phy(void *upstream)
{
phylink_disconnect_phy(upstream);
}
static const struct sfp_upstream_ops sfp_phylink_ops = {
.module_insert = phylink_sfp_module_insert,
.link_up = phylink_sfp_link_up,
.link_down = phylink_sfp_link_down,
.connect_phy = phylink_sfp_connect_phy,
.disconnect_phy = phylink_sfp_disconnect_phy,
};
MODULE_LICENSE("GPL");

475
drivers/net/phy/sfp-bus.c Normal file
View File

@@ -0,0 +1,475 @@
#include <linux/export.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/phylink.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include "sfp.h"
struct sfp_bus {
struct kref kref;
struct list_head node;
struct device_node *device_node;
const struct sfp_socket_ops *socket_ops;
struct device *sfp_dev;
struct sfp *sfp;
const struct sfp_upstream_ops *upstream_ops;
void *upstream;
struct net_device *netdev;
struct phy_device *phydev;
bool registered;
bool started;
};
int sfp_parse_port(struct sfp_bus *bus, const struct sfp_eeprom_id *id,
unsigned long *support)
{
int port;
/* port is the physical connector, set this from the connector field. */
switch (id->base.connector) {
case SFP_CONNECTOR_SC:
case SFP_CONNECTOR_FIBERJACK:
case SFP_CONNECTOR_LC:
case SFP_CONNECTOR_MT_RJ:
case SFP_CONNECTOR_MU:
case SFP_CONNECTOR_OPTICAL_PIGTAIL:
if (support)
phylink_set(support, FIBRE);
port = PORT_FIBRE;
break;
case SFP_CONNECTOR_RJ45:
if (support)
phylink_set(support, TP);
port = PORT_TP;
break;
case SFP_CONNECTOR_UNSPEC:
if (id->base.e1000_base_t) {
if (support)
phylink_set(support, TP);
port = PORT_TP;
break;
}
/* fallthrough */
case SFP_CONNECTOR_SG: /* guess */
case SFP_CONNECTOR_MPO_1X12:
case SFP_CONNECTOR_MPO_2X16:
case SFP_CONNECTOR_HSSDC_II:
case SFP_CONNECTOR_COPPER_PIGTAIL:
case SFP_CONNECTOR_NOSEPARATE:
case SFP_CONNECTOR_MXC_2X16:
port = PORT_OTHER;
break;
default:
dev_warn(bus->sfp_dev, "SFP: unknown connector id 0x%02x\n",
id->base.connector);
port = PORT_OTHER;
break;
}
return port;
}
EXPORT_SYMBOL_GPL(sfp_parse_port);
phy_interface_t sfp_parse_interface(struct sfp_bus *bus,
const struct sfp_eeprom_id *id)
{
phy_interface_t iface;
/* Setting the serdes link mode is guesswork: there's no field in
* the EEPROM which indicates what mode should be used.
*
* If the module wants 64b66b, then it must be >= 10G.
*
* If it's a gigabit-only fiber module, it probably does not have
* a PHY, so switch to 802.3z negotiation mode. Otherwise, switch
* to SGMII mode (which is required to support non-gigabit speeds).
*/
switch (id->base.encoding) {
case SFP_ENCODING_8472_64B66B:
iface = PHY_INTERFACE_MODE_10GKR;
break;
case SFP_ENCODING_8B10B:
if (!id->base.e1000_base_t &&
!id->base.e100_base_lx &&
!id->base.e100_base_fx)
iface = PHY_INTERFACE_MODE_1000BASEX;
else
iface = PHY_INTERFACE_MODE_SGMII;
break;
default:
iface = PHY_INTERFACE_MODE_NA;
dev_err(bus->sfp_dev,
"SFP module encoding does not support 8b10b nor 64b66b\n");
break;
}
return iface;
}
EXPORT_SYMBOL_GPL(sfp_parse_interface);
void sfp_parse_support(struct sfp_bus *bus, const struct sfp_eeprom_id *id,
unsigned long *support)
{
phylink_set(support, Autoneg);
phylink_set(support, Pause);
phylink_set(support, Asym_Pause);
/* Set ethtool support from the compliance fields. */
if (id->base.e10g_base_sr)
phylink_set(support, 10000baseSR_Full);
if (id->base.e10g_base_lr)
phylink_set(support, 10000baseLR_Full);
if (id->base.e10g_base_lrm)
phylink_set(support, 10000baseLRM_Full);
if (id->base.e10g_base_er)
phylink_set(support, 10000baseER_Full);
if (id->base.e1000_base_sx ||
id->base.e1000_base_lx ||
id->base.e1000_base_cx)
phylink_set(support, 1000baseX_Full);
if (id->base.e1000_base_t) {
phylink_set(support, 1000baseT_Half);
phylink_set(support, 1000baseT_Full);
}
switch (id->base.extended_cc) {
case 0x00: /* Unspecified */
break;
case 0x02: /* 100Gbase-SR4 or 25Gbase-SR */
phylink_set(support, 100000baseSR4_Full);
phylink_set(support, 25000baseSR_Full);
break;
case 0x03: /* 100Gbase-LR4 or 25Gbase-LR */
case 0x04: /* 100Gbase-ER4 or 25Gbase-ER */
phylink_set(support, 100000baseLR4_ER4_Full);
break;
case 0x0b: /* 100Gbase-CR4 or 25Gbase-CR CA-L */
case 0x0c: /* 25Gbase-CR CA-S */
case 0x0d: /* 25Gbase-CR CA-N */
phylink_set(support, 100000baseCR4_Full);
phylink_set(support, 25000baseCR_Full);
break;
default:
dev_warn(bus->sfp_dev,
"Unknown/unsupported extended compliance code: 0x%02x\n",
id->base.extended_cc);
break;
}
/* For fibre channel SFP, derive possible BaseX modes */
if (id->base.fc_speed_100 ||
id->base.fc_speed_200 ||
id->base.fc_speed_400) {
if (id->base.br_nominal >= 31)
phylink_set(support, 2500baseX_Full);
if (id->base.br_nominal >= 12)
phylink_set(support, 1000baseX_Full);
}
switch (id->base.connector) {
case SFP_CONNECTOR_SC:
case SFP_CONNECTOR_FIBERJACK:
case SFP_CONNECTOR_LC:
case SFP_CONNECTOR_MT_RJ:
case SFP_CONNECTOR_MU:
case SFP_CONNECTOR_OPTICAL_PIGTAIL:
break;
case SFP_CONNECTOR_UNSPEC:
if (id->base.e1000_base_t)
break;
case SFP_CONNECTOR_SG: /* guess */
case SFP_CONNECTOR_MPO_1X12:
case SFP_CONNECTOR_MPO_2X16:
case SFP_CONNECTOR_HSSDC_II:
case SFP_CONNECTOR_COPPER_PIGTAIL:
case SFP_CONNECTOR_NOSEPARATE:
case SFP_CONNECTOR_MXC_2X16:
default:
/* a guess at the supported link modes */
dev_warn(bus->sfp_dev,
"Guessing link modes, please report...\n");
phylink_set(support, 1000baseT_Half);
phylink_set(support, 1000baseT_Full);
break;
}
}
EXPORT_SYMBOL_GPL(sfp_parse_support);
static LIST_HEAD(sfp_buses);
static DEFINE_MUTEX(sfp_mutex);
static const struct sfp_upstream_ops *sfp_get_upstream_ops(struct sfp_bus *bus)
{
return bus->registered ? bus->upstream_ops : NULL;
}
static struct sfp_bus *sfp_bus_get(struct device_node *np)
{
struct sfp_bus *sfp, *new, *found = NULL;
new = kzalloc(sizeof(*new), GFP_KERNEL);
mutex_lock(&sfp_mutex);
list_for_each_entry(sfp, &sfp_buses, node) {
if (sfp->device_node == np) {
kref_get(&sfp->kref);
found = sfp;
break;
}
}
if (!found && new) {
kref_init(&new->kref);
new->device_node = np;
list_add(&new->node, &sfp_buses);
found = new;
new = NULL;
}
mutex_unlock(&sfp_mutex);
kfree(new);
return found;
}
static void sfp_bus_release(struct kref *kref) __releases(sfp_mutex)
{
struct sfp_bus *bus = container_of(kref, struct sfp_bus, kref);
list_del(&bus->node);
mutex_unlock(&sfp_mutex);
kfree(bus);
}
static void sfp_bus_put(struct sfp_bus *bus)
{
kref_put_mutex(&bus->kref, sfp_bus_release, &sfp_mutex);
}
static int sfp_register_bus(struct sfp_bus *bus)
{
const struct sfp_upstream_ops *ops = bus->upstream_ops;
int ret;
if (ops) {
if (ops->link_down)
ops->link_down(bus->upstream);
if (ops->connect_phy && bus->phydev) {
ret = ops->connect_phy(bus->upstream, bus->phydev);
if (ret)
return ret;
}
}
if (bus->started)
bus->socket_ops->start(bus->sfp);
bus->registered = true;
return 0;
}
static void sfp_unregister_bus(struct sfp_bus *bus)
{
const struct sfp_upstream_ops *ops = bus->upstream_ops;
if (bus->registered) {
if (bus->started)
bus->socket_ops->stop(bus->sfp);
if (bus->phydev && ops && ops->disconnect_phy)
ops->disconnect_phy(bus->upstream);
}
bus->registered = false;
}
int sfp_get_module_info(struct sfp_bus *bus, struct ethtool_modinfo *modinfo)
{
if (!bus->registered)
return -ENOIOCTLCMD;
return bus->socket_ops->module_info(bus->sfp, modinfo);
}
EXPORT_SYMBOL_GPL(sfp_get_module_info);
int sfp_get_module_eeprom(struct sfp_bus *bus, struct ethtool_eeprom *ee,
u8 *data)
{
if (!bus->registered)
return -ENOIOCTLCMD;
return bus->socket_ops->module_eeprom(bus->sfp, ee, data);
}
EXPORT_SYMBOL_GPL(sfp_get_module_eeprom);
void sfp_upstream_start(struct sfp_bus *bus)
{
if (bus->registered)
bus->socket_ops->start(bus->sfp);
bus->started = true;
}
EXPORT_SYMBOL_GPL(sfp_upstream_start);
void sfp_upstream_stop(struct sfp_bus *bus)
{
if (bus->registered)
bus->socket_ops->stop(bus->sfp);
bus->started = false;
}
EXPORT_SYMBOL_GPL(sfp_upstream_stop);
struct sfp_bus *sfp_register_upstream(struct device_node *np,
struct net_device *ndev, void *upstream,
const struct sfp_upstream_ops *ops)
{
struct sfp_bus *bus = sfp_bus_get(np);
int ret = 0;
if (bus) {
rtnl_lock();
bus->upstream_ops = ops;
bus->upstream = upstream;
bus->netdev = ndev;
if (bus->sfp)
ret = sfp_register_bus(bus);
rtnl_unlock();
}
if (ret) {
sfp_bus_put(bus);
bus = NULL;
}
return bus;
}
EXPORT_SYMBOL_GPL(sfp_register_upstream);
void sfp_unregister_upstream(struct sfp_bus *bus)
{
rtnl_lock();
sfp_unregister_bus(bus);
bus->upstream = NULL;
bus->netdev = NULL;
rtnl_unlock();
sfp_bus_put(bus);
}
EXPORT_SYMBOL_GPL(sfp_unregister_upstream);
/* Socket driver entry points */
int sfp_add_phy(struct sfp_bus *bus, struct phy_device *phydev)
{
const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
int ret = 0;
if (ops && ops->connect_phy)
ret = ops->connect_phy(bus->upstream, phydev);
if (ret == 0)
bus->phydev = phydev;
return ret;
}
EXPORT_SYMBOL_GPL(sfp_add_phy);
void sfp_remove_phy(struct sfp_bus *bus)
{
const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
if (ops && ops->disconnect_phy)
ops->disconnect_phy(bus->upstream);
bus->phydev = NULL;
}
EXPORT_SYMBOL_GPL(sfp_remove_phy);
void sfp_link_up(struct sfp_bus *bus)
{
const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
if (ops && ops->link_up)
ops->link_up(bus->upstream);
}
EXPORT_SYMBOL_GPL(sfp_link_up);
void sfp_link_down(struct sfp_bus *bus)
{
const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
if (ops && ops->link_down)
ops->link_down(bus->upstream);
}
EXPORT_SYMBOL_GPL(sfp_link_down);
int sfp_module_insert(struct sfp_bus *bus, const struct sfp_eeprom_id *id)
{
const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
int ret = 0;
if (ops && ops->module_insert)
ret = ops->module_insert(bus->upstream, id);
return ret;
}
EXPORT_SYMBOL_GPL(sfp_module_insert);
void sfp_module_remove(struct sfp_bus *bus)
{
const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
if (ops && ops->module_remove)
ops->module_remove(bus->upstream);
}
EXPORT_SYMBOL_GPL(sfp_module_remove);
struct sfp_bus *sfp_register_socket(struct device *dev, struct sfp *sfp,
const struct sfp_socket_ops *ops)
{
struct sfp_bus *bus = sfp_bus_get(dev->of_node);
int ret = 0;
if (bus) {
rtnl_lock();
bus->sfp_dev = dev;
bus->sfp = sfp;
bus->socket_ops = ops;
if (bus->netdev)
ret = sfp_register_bus(bus);
rtnl_unlock();
}
if (ret) {
sfp_bus_put(bus);
bus = NULL;
}
return bus;
}
EXPORT_SYMBOL_GPL(sfp_register_socket);
void sfp_unregister_socket(struct sfp_bus *bus)
{
rtnl_lock();
sfp_unregister_bus(bus);
bus->sfp_dev = NULL;
bus->sfp = NULL;
bus->socket_ops = NULL;
rtnl_unlock();
sfp_bus_put(bus);
}
EXPORT_SYMBOL_GPL(sfp_unregister_socket);

28
drivers/net/phy/sfp.h Normal file
View File

@@ -0,0 +1,28 @@
#ifndef SFP_H
#define SFP_H
#include <linux/ethtool.h>
#include <linux/sfp.h>
struct sfp;
struct sfp_socket_ops {
void (*start)(struct sfp *sfp);
void (*stop)(struct sfp *sfp);
int (*module_info)(struct sfp *sfp, struct ethtool_modinfo *modinfo);
int (*module_eeprom)(struct sfp *sfp, struct ethtool_eeprom *ee,
u8 *data);
};
int sfp_add_phy(struct sfp_bus *bus, struct phy_device *phydev);
void sfp_remove_phy(struct sfp_bus *bus);
void sfp_link_up(struct sfp_bus *bus);
void sfp_link_down(struct sfp_bus *bus);
int sfp_module_insert(struct sfp_bus *bus, const struct sfp_eeprom_id *id);
void sfp_module_remove(struct sfp_bus *bus);
int sfp_link_configure(struct sfp_bus *bus, const struct sfp_eeprom_id *id);
struct sfp_bus *sfp_register_socket(struct device *dev, struct sfp *sfp,
const struct sfp_socket_ops *ops);
void sfp_unregister_socket(struct sfp_bus *bus);
#endif