tb_tunnel_reserved_pci(9)

🌸 NAME 🌸

okay bestie, welcome to the tb_tunnel_reserved_pci(9) page from the Kernel API Manual ✨ — this one is literally about the amount of bandwidth to reserve for PCIe 👑

🎀 SYNOPSIS 🎀

here's the exact signature, no cap:

bool tb_tunnel_reserved_pci (struct tb_port *port , int *reserved_up ,
       int *reserved_down );

💅 ARGUMENTS 💅

• port — Lane 0 adapter.
• reserved_up — Upstream bandwidth in Mb/s to reserve.
• reserved_down — Downstream bandwidth in Mb/s to reserve.

🦋 DESCRIPTION 🦋

Call it on any connected lane 0 adapter, and it tells you how much bandwidth needs to be left in reserve for possible PCIe bulk traffic 🌸. That's the whole vibe: it's the reserve check for PCIe bulk traffic, and it's lowkey iconic.

⭐ RETURN ⭐

two outcomes, bestie:

• true — If there is something to be reserved. It writes the amount to reserved_down/reserved_up 💖
• false — Nothing to be reserved. It leaves reserved_down/reserved_up unmodified 🙈

🌈 SEE ALSO 🌈

Kernel file ./drivers/thunderbolt/tunnel.c — and the whole SEE ALSO friend group is:

• tb_available_credits(9)
• tb_tunnel_event(9)
• tb_tunnel_discover_pci(9)
• tb_tunnel_alloc_pci(9)
• tb_dp_bandwidth_mode_maximum_bandwidth(9)
• tb_tunnel_discover_dp(9)
• tb_tunnel_alloc_dp(9)
• tb_tunnel_alloc_dma(9)
• tb_tunnel_match_dma(9)
• tb_tunnel_discover_usb3(9)
• tb_tunnel_alloc_usb3(9)
• tb_tunnel_is_invalid(9)
• tb_tunnel_activate(9)
• tb_tunnel_deactivate(9)
• tb_tunnel_port_on_path(9)
• tb_tunnel_maximum_bandwidth(9)
• tb_tunnel_allocated_bandwidth(9)
• tb_tunnel_alloc_bandwidth(9)
• tb_tunnel_consumed_bandwidth(9)
• tb_tunnel_release_unused_bandwidth(9)
• tb_tunnel_reclaim_available_bandwidth(9)

okay that's the page, bestie 💜 source/version ./drivers/thunderbolt, date October 2026, manual tb_tunnel_reserved_pci(9) — mwah 💋✨