tb_switch_downstream_port(9)

💜 tb_switch_downstream_port(9) 💜

okay so welcome to the Kernel API Manual page for tb_switch_downstream_port, bestie 💖 this is the lil function that gets you the downstream facing port of the parent router. slay.

✨ NAME ✨

tb_switch_downstream_port — return the downstream facing port of the parent router. no cap, that’s the whole name-vibe.

✨ SYNOPSIS ✨

struct tb_port * tb_switch_downstream_port (struct tb_switch *sw );

🎀 ARGUMENTS 🎀

• sw — device router pointer, bestie. that’s the thing you hand over.

💅 DESCRIPTION 💅

Call this one only for device routers. like, that’s the rule. it’s giving “device routers only” energy, and we respect it fr fr.

🔥 RETURN 🔥

Pointer to struct tb_port or NULL in case of failure. so: actual port pointer when it works, NULL when it doesn’t. periodt.

🦋 SEE ALSO 🦋

Kernel file ./drivers/thunderbolt/tb.h is the home base, and here’s the whole friend group:

• struct tb_nvm(9)
• enum tb_switch_tmu_mode(9)
• struct tb_switch_tmu(9)
• struct tb_switch(9)
• struct tb_bandwidth_group(9)
• struct tb_port(9)
• struct usb4_port(9)
• struct tb_retimer(9)
• struct tb_path_hop(9)
• enum tb_path_port(9)
• struct tb_path(9)
• struct tb_cm_ops(9)
• tb_upstream_port(9)
• tb_is_upstream_port(9)
• tb_port_has_remote(9)
• tb_domain_event(9)
• tb_switch_for_each_port(9)
• tb_switch_depth(9)
• tb_switch_is_icm(9)
• tb_switch_tmu_is_configured(9)
• tb_switch_tmu_is_enabled(9)
• tb_switch_clx_is_enabled(9)
• tb_port_path_direction_downstream(9)
• tb_for_each_port_on_path(9)
• tb_for_each_upstream_port_on_path(9)
• tb_path_for_each_hop(9)
• tb_downstream_route(9)
• tb_xdomain_downstream_port(9)
• usb4_switch_version(9)
• tb_switch_is_usb4(9)
• enum usb4_sb_target(9)
• enum usb4_margin_sw_error_counter(9)
• struct usb4_port_margining_params(9)

byeeee 🫶 this page is from ./drivers/thunderbolt, dated October 2026, and it’s literally tb_switch_downstream_port(9) — mwah 💅✨