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Date: Wed, 10 May 2023 12:23:42 +0100
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
Heiner Kallweit <hkallweit1@...il.com>
Cc: Daniel Golle <daniel@...rotopia.org>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
netdev@...r.kernel.org
Subject: [PATCH RFC net-next 6/7] 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).
Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
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(+)
diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index cf53096047e6..7db67ff2812c 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -156,6 +156,23 @@ static const char *phylink_an_mode_str(unsigned int mode)
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
@@ -1025,6 +1042,7 @@ static void phylink_major_config(struct phylink *pl, bool restart,
{
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));
@@ -1084,6 +1102,12 @@ static void phylink_major_config(struct phylink *pl, bool restart,
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);
}
diff --git a/drivers/net/phy/sfp-bus.c b/drivers/net/phy/sfp-bus.c
index 9372e5a4cadc..e8dd47bffe43 100644
--- a/drivers/net/phy/sfp-bus.c
+++ b/drivers/net/phy/sfp-bus.c
@@ -575,6 +575,26 @@ static void sfp_upstream_clear(struct sfp_bus *bus)
bus->upstream = NULL;
}
+/**
+ * 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)
diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index bf7dac9977e1..34bf724c00c7 100644
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -2527,6 +2527,10 @@ 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 */
@@ -2611,6 +2615,7 @@ static const struct sfp_socket_ops sfp_module_ops = {
.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,
diff --git a/drivers/net/phy/sfp.h b/drivers/net/phy/sfp.h
index 6cf1643214d3..c7cb50d10099 100644
--- 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);
diff --git a/include/linux/sfp.h b/include/linux/sfp.h
index ef06a195b3c2..2f66e03e9dbd 100644
--- a/include/linux/sfp.h
+++ b/include/linux/sfp.h
@@ -556,6 +556,7 @@ int sfp_get_module_eeprom_by_page(struct sfp_bus *bus,
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,
@@ -615,6 +616,11 @@ static inline void sfp_upstream_stop(struct sfp_bus *bus)
{
}
+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)
{
}
--
2.30.2
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