diff options
Diffstat (limited to 'drivers/net/phy/sfp-bus.c')
| -rw-r--r-- | drivers/net/phy/sfp-bus.c | 475 |
1 files changed, 475 insertions, 0 deletions
diff --git a/drivers/net/phy/sfp-bus.c b/drivers/net/phy/sfp-bus.c new file mode 100644 index 000000000000..5cb5384697ea --- /dev/null +++ b/drivers/net/phy/sfp-bus.c @@ -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); |