tb_for_each...port_on_path(9)

🦋 tb_for_each...port_on_path(9) — Kernel API Manual 🦋

okay bestie, welcome to the Kernel API Manual page for tb_for_each_upstream_port_on_path(9) — yes the title up top is abbreviated because the full name is kinda long, but that's fine, we move 💅

---

✨ NAME ✨

tb_for_each_upstream_port_on_path — literally just iterate over each upstream port on a path 🫶

---

🎀 SYNOPSIS 🎀

tb_for_each_upstream_port_on_path (src , dst , p );

no cap, that's the whole signature. keep the spaces exactly as they are, she's quirky like that 🙈

---

🌸 ARGUMENTS 🌸

• src — the source port, like where the journey starts 🚀
• dst — the destination port, the final boss destination 👑
• p — the port that gets used as the iterator, aka the little loop variable doing all the walking 🚶‍♀️

---

💖 DESCRIPTION 💖

So the way that this works is: it walks over each upstream lane adapter on the path from src to dst. that's it. that's the vibe. every upstream lane adapter along the way gets a visit, one at a time, and p is the main character holding your current spot in the iteration ✨

lowkey iconic macro energy — it's giving "for loop but with lore" 💀

---

🌈 SEE ALSO 🌈

the whole friend group, in order, no one left out fr fr:

• ./drivers/thunderbolt/tb.h — the kernel file herself 💜
• 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_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)

---

that's the whole page bestie, go forth and iterate 🧚

sign-off szn: this lil masterpiece lives in ./drivers/thunderbolt, dated October 2026, and it's page tb_for_each...port_on_path(9) of your fave manual. mwah 💋 ⭐