tb_downstream_route(9)

💅 tb_downstream_route(9) — get route to downstream switch 💅

okay so bestie, this is the tb_downstream_route(9) page from the Kernel API Manual, and it’s giving “tiny function, very important route energy.” ✨

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🌸 NAME 🌸

tb_downstream_route — get route to downstream switch

🦋 SYNOPSIS 🦋

u64 tb_downstream_route (struct tb_port *port );

🎀 ARGUMENTS 🎀

• port — the port you’re checking, periodt.

💅 DESCRIPTION 💅

Okay so real talk: port must not be the upstream port. Otherwise a loop is created. No cap, that is literally the rule. 🫶

bestie, do not mess with this one — upstream port in, loop chaos out. 💀

🔥 RETURN 🔥

Route to the switch behind port. Slay. 👑

👑 SEE ALSO 👑

Go peek at these, iykyk:

• Kernel file ./drivers/thunderbolt/tb.h
• 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_downstream_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_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)

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🫶 signed, sealed, delivered: this page lives under ./drivers/thunderbolt, dated October 2026, and it’s literally tb_downstream_route(9). 💖