sfp_upstream_start(9)

okay bestie, welcome to the sfp_upstream_start(9) page from the Kernel API Manual ✨ this one is short and sweet, and yes, it's giving “tiny but important” energy 💅

🌸 NAME 🌸

sfp_upstream_start — inform the SFP that the network device is up 🫶

🎀 SYNOPSIS 🎀

void sfp_upstream_start (struct sfp_bus *bus );

💖 ARGUMENTS 💖

• bus — a pointer to the struct sfp_bus structure for the sfp module 🦋

✨ DESCRIPTION ✨

okay so, bestie, this is you telling the SFP socket that the network device is now up 🔥 that way the module can be enabled by allowing TX_DISABLE to be deasserted. no cap, that's the whole vibe.

this should be called from the network device driver's struct net_device_ops ndo_open method 👑 literally that's where it belongs.

🦋 SEE ALSO 🦋

• Kernel file ./drivers/net/phy/sfp-bus.c
• struct sfp_bus(9)
• sfp_select_interface(9)
• sfp_bus_put(9)
• sfp_get_module_info(9)
• sfp_get_module_eeprom(9)
• sfp_get_module_eeprom_by_page(9)
• sfp_upstream_stop(9)
• sfp_upstream_set_signal_rate(9)
• sfp_bus_find_fwnode(9)
• sfp_bus_add_upstream(9)
• sfp_bus_del_upstream(9)
• sfp_get_name(9)

and that's the whole page, bestie 🎀 source path is ./drivers/net/phy, dated October 2026, for sfp_upstream_start(9) — mwah 💋✨