tb_port_add_nfc_credits(9)

💅 tb_port_add_nfc_credits(9) — from the Kernel API Manual, bestie 🎀

okay so this one is called tb_port_add_nfc_credits and it lives in the Kernel API Manual, and honestly? it's giving "tiny function, big responsibilities" energy ✨

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🌸 NAME 🌸

tb_port_add_nfc_credits — add/remove non flow controlled credits to a port 💖

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🦋 SYNOPSIS 🦋

int tb_port_add_nfc_credits (struct tb_port *port , int credits );

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✨ ARGUMENTS ✨

• port — the port you're adding/removing NFC credits on 🫶
• credits — the credits to add/remove, literally that's it 💅

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👑 DESCRIPTION 👑

so here's the tea ☕ — this function changes the number of NFC credits allocated to port by credits. that's the whole vibe, no cap.

and the little plot twist? to remove NFC credits, you pass a negative amount of credits 🙈 like yes, we're doing signed arithmetic, it ate and left no crumbs 💀

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⭐ RETURN ⭐

• 0 on success 🥳
• negative errno otherwise 😭 (that's your cue something went sideways)

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🌈 SEE ALSO 🌈

Kernel file ./drivers/thunderbolt/switch.c, plus a whole friend group of functions — every single one, because we don't leave anyone out of the group chat 🫶:

• tb_switch_nvm_read(9)
• tb_port_state(9)
• tb_wait_for_port(9)
• tb_port_clear_counter(9)
• tb_port_unlock(9)
• tb_port_enable(9)
• tb_port_disable(9)
• tb_port_reset(9)
• tb_port_alloc_in_hopid(9)
• tb_port_alloc_out_hopid(9)
• tb_port_release_in_hopid(9)
• tb_port_release_out_hopid(9)
• tb_next_port_on_path(9)
• tb_port_get_link_speed(9)
• tb_port_get_link_generation(9)
• tb_port_get_link_width(9)
• tb_port_width_supported(9)
• tb_port_set_link_width(9)
• tb_port_set_lane_bonding(9)
• tb_port_lane_bonding_enable(9)
• tb_port_lane_bonding_disable(9)
• tb_port_wait_for_link_width(9)
• tb_port_update_credits(9)
• tb_port_is_enabled(9)
• tb_usb3_port_is_enabled(9)
• tb_usb3_port_enable(9)
• tb_pci_port_is_enabled(9)
• tb_pci_port_enable(9)
• tb_dp_port_hpd_is_active(9)
• tb_dp_port_hpd_clear(9)
• tb_dp_port_set_hops(9)
• tb_dp_port_is_enabled(9)
• tb_dp_port_enable(9)
• tb_switch_reset(9)
• tb_switch_wait_for_bit(9)
• tb_switch_alloc(9)
• tb_switch_alloc_safe_mode(9)
• tb_switch_configure(9)
• tb_switch_configuration_valid(9)
• tb_switch_lane_bonding_enable(9)
• tb_switch_lane_bonding_disable(9)
• tb_switch_set_link_width(9)
• tb_switch_configure_link(9)
• tb_switch_unconfigure_link(9)
• tb_switch_add(9)
• tb_switch_remove(9)
• tb_sw_set_unplugged(9)
• tb_switch_resume(9)
• tb_switch_suspend(9)
• tb_switch_query_dp_resource(9)
• tb_switch_alloc_dp_resource(9)
• tb_switch_dealloc_dp_resource(9)
• tb_switch_find_by_link_depth(9)
• tb_switch_find_by_uuid(9)
• tb_switch_find_by_route(9)
• tb_switch_find_port(9)
• tb_switch_pcie_l1_enable(9)
• tb_switch_xhci_connect(9)
• tb_switch_xhci_disconnect(9)

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and that's the whole page, bestie 🧚 this came from ./drivers/thunderbolt, dated October 2026, and it goes by tb_port_add_nfc_credits(9) — periodt 💜💅