tb_xdomain_alloc_out_hopid(9)

💅 tb_xdomain_alloc_out_hopid(9) — like, the Kernel API Manual bestie ✨

okay so real talk, this is tb_xdomain_alloc_out_hopid, straight outta the Kernel API Manual, and it is literally the function that hands you an output HopID for tunneling. yes queen, we're doing Thunderbolt plumbing today 🦋

---

🌸 NAME 🌸

tb_xdomain_alloc_out_hopid — Allocate output HopID for tunneling 💫

✨ SYNOPSIS ✨

int tb_xdomain_alloc_out_hopid (struct tb_xdomain *xd , int hopid );

🎀 ARGUMENTS 🎀

• xd — the XDomain connection, bestie. that's your whole vibe right there 🫶
• hopid — your preferred HopID, or -1 if you're feeling chaotic and just want the next available one 🙈

💖 DESCRIPTION 💖

not me explaining this but okay: the HopID that comes back is guaranteed to be within the range supported by the output lane adapter. no cap, it's fully in range 💅

and when you're done with it? call tb_xdomain_release_out_hopid to release the allocated HopID. give it back, don't be a HopID hoarder 🎀

🔥 RETURN 🔥

• Allocated HopID — on success, slay ✨
• -ENOSPC — if there are no more available HopIDs 😭 the well is dry, bestie
• Negative errno — another error occurred, which is giving "it's complicated" 💀

👑 SEE ALSO 👑

Kernel file ./drivers/thunderbolt/xdomain.c plus the whole squad:

• tb_xdomain_response(9)
• tb_xdomain_request(9)
• tb_register_protocol_handler(9)
• tb_unregister_protocol_handler(9)
• tb_register_service_driver(9)
• tb_unregister_service_driver(9)
• tb_service_properties_changed(9)
• tb_xdomain_alloc(9)
• tb_xdomain_add(9)
• tb_xdomain_remove(9)
• tb_xdomain_unregister(9)
• tb_xdomain_lane_bonding_enable(9)
• tb_xdomain_lane_bonding_disable(9)
• tb_xdomain_alloc_in_hopid(9)
• tb_xdomain_release_in_hopid(9)
• tb_xdomain_release_out_hopid(9)
• tb_xdomain_enable_paths(9)
• tb_xdomain_disable_paths(9)
• tb_xdomain_find_by_uuid(9)
• tb_xdomain_find_by_link_depth(9)
• tb_xdomain_find_by_route(9)
• tb_register_property_dir(9)
• tb_unregister_property_dir(9)

---

ngl if you came here looking for tb_xdomain_release_out_hopid(9), it's right up there in the list, bestie — go be free 🧚

and that's the page! footer tea: this one lives in ./drivers/thunderbolt, dated October 2026, and it's tb_xdomain_alloc_out_hopid(9) the whole way down. periodt. 💜🌈