From 0100d1c5789018ba77bf2f4fab3bd91ecece7b3b Mon Sep 17 00:00:00 2001 From: "Russell King (Oracle)" Date: Wed, 17 May 2023 11:38:12 +0100 Subject: [PATCH 14/21] net: sfp: add support for setting signalling rate Add support to the SFP layer to allow phylink to set the signalling rate for a SFP module. The rate given will be in units of kilo-baud (1000 baud). Reviewed-by: Simon Horman Signed-off-by: Russell King (Oracle) Signed-off-by: Jakub Kicinski --- drivers/net/phy/phylink.c | 24 ++++++++++++++++++++++++ drivers/net/phy/sfp-bus.c | 20 ++++++++++++++++++++ drivers/net/phy/sfp.c | 5 +++++ drivers/net/phy/sfp.h | 1 + include/linux/sfp.h | 6 ++++++ 5 files changed, 56 insertions(+) --- a/drivers/net/phy/phylink.c +++ b/drivers/net/phy/phylink.c @@ -156,6 +156,23 @@ static const char *phylink_an_mode_str(u return mode < ARRAY_SIZE(modestr) ? modestr[mode] : "unknown"; } +static unsigned int phylink_interface_signal_rate(phy_interface_t interface) +{ + switch (interface) { + case PHY_INTERFACE_MODE_SGMII: + case PHY_INTERFACE_MODE_1000BASEX: /* 1.25Mbd */ + return 1250; + case PHY_INTERFACE_MODE_2500BASEX: /* 3.125Mbd */ + return 3125; + case PHY_INTERFACE_MODE_5GBASER: /* 5.15625Mbd */ + return 5156; + case PHY_INTERFACE_MODE_10GBASER: /* 10.3125Mbd */ + return 10313; + default: + return 0; + } +} + /** * phylink_interface_max_speed() - get the maximum speed of a phy interface * @interface: phy interface mode defined by &typedef phy_interface_t @@ -1024,6 +1041,7 @@ static void phylink_major_config(struct { struct phylink_pcs *pcs = NULL; bool pcs_changed = false; + unsigned int rate_kbd; int err; phylink_dbg(pl, "major config %s\n", phy_modes(state->interface)); @@ -1083,6 +1101,12 @@ static void phylink_major_config(struct ERR_PTR(err)); } + if (pl->sfp_bus) { + rate_kbd = phylink_interface_signal_rate(state->interface); + if (rate_kbd) + sfp_upstream_set_signal_rate(pl->sfp_bus, rate_kbd); + } + phylink_pcs_poll_start(pl); } --- a/drivers/net/phy/sfp-bus.c +++ b/drivers/net/phy/sfp-bus.c @@ -586,6 +586,26 @@ static void sfp_upstream_clear(struct sf } /** + * sfp_upstream_set_signal_rate() - set data signalling rate + * @bus: a pointer to the &struct sfp_bus structure for the sfp module + * @rate_kbd: signalling rate in units of 1000 baud + * + * Configure the rate select settings on the SFP module for the signalling + * rate (not the same as the data rate). + * + * Locks that may be held: + * Phylink's state_mutex + * rtnl lock + * SFP's sm_mutex + */ +void sfp_upstream_set_signal_rate(struct sfp_bus *bus, unsigned int rate_kbd) +{ + if (bus->registered) + bus->socket_ops->set_signal_rate(bus->sfp, rate_kbd); +} +EXPORT_SYMBOL_GPL(sfp_upstream_set_signal_rate); + +/** * sfp_bus_find_fwnode() - parse and locate the SFP bus from fwnode * @fwnode: firmware node for the parent device (MAC or PHY) * --- a/drivers/net/phy/sfp.c +++ b/drivers/net/phy/sfp.c @@ -2473,6 +2473,10 @@ static void sfp_stop(struct sfp *sfp) sfp_sm_event(sfp, SFP_E_DEV_DOWN); } +static void sfp_set_signal_rate(struct sfp *sfp, unsigned int rate_kbd) +{ +} + static int sfp_module_info(struct sfp *sfp, struct ethtool_modinfo *modinfo) { /* locking... and check module is present */ @@ -2551,6 +2555,7 @@ static const struct sfp_socket_ops sfp_m .detach = sfp_detach, .start = sfp_start, .stop = sfp_stop, + .set_signal_rate = sfp_set_signal_rate, .module_info = sfp_module_info, .module_eeprom = sfp_module_eeprom, .module_eeprom_by_page = sfp_module_eeprom_by_page, --- a/drivers/net/phy/sfp.h +++ b/drivers/net/phy/sfp.h @@ -19,6 +19,7 @@ struct sfp_socket_ops { void (*detach)(struct sfp *sfp); void (*start)(struct sfp *sfp); void (*stop)(struct sfp *sfp); + void (*set_signal_rate)(struct sfp *sfp, unsigned int rate_kbd); int (*module_info)(struct sfp *sfp, struct ethtool_modinfo *modinfo); int (*module_eeprom)(struct sfp *sfp, struct ethtool_eeprom *ee, u8 *data); --- a/include/linux/sfp.h +++ b/include/linux/sfp.h @@ -547,6 +547,7 @@ int sfp_get_module_eeprom_by_page(struct struct netlink_ext_ack *extack); void sfp_upstream_start(struct sfp_bus *bus); void sfp_upstream_stop(struct sfp_bus *bus); +void sfp_upstream_set_signal_rate(struct sfp_bus *bus, unsigned int rate_kbd); void sfp_bus_put(struct sfp_bus *bus); struct sfp_bus *sfp_bus_find_fwnode(const struct fwnode_handle *fwnode); int sfp_bus_add_upstream(struct sfp_bus *bus, void *upstream, @@ -606,6 +607,11 @@ static inline void sfp_upstream_stop(str { } +static inline void sfp_upstream_set_signal_rate(struct sfp_bus *bus, + unsigned int rate_kbd) +{ +} + static inline void sfp_bus_put(struct sfp_bus *bus) { }