ntb_peer_log..._port_number(9)

✨ NAME ✨

okay bestie, welcome to the Kernel API Manual page for ntb_peer_logical_port_number — the one and only ntb_peer_log..._port_number(9) (yes, the title up top gets a lil truncated moment, iykyk 💅). She's here to get the logical peer port by given index. Periodt.

🌸 SYNOPSIS 🌸

int ntb_peer_logical_port_number (struct ntb_dev *ntb , int pidx );

🎀 ARGUMENTS 🎀

• ntb — NTB device context. That's the main-character device you're working with, bestie.
• pidx — Peer port index. The index you're asking about.

🦋 DESCRIPTION 🦋

Okay so the Logical Port Number is defined to be a unique number for each port, starting from zero through to the number of ports minus one. Literally the group-chat numbering system: 0, 1, 2, … and so on until ports-minus-one.

This is in contrast to the Port Number, where each port can be assigned any unique physical number by the hardware. So logical = the cute sequential ID; physical = whatever number the hardware decided to hand out.

The logical port number is useful for calculating the resource indexes used by peers. That's the whole reason she exists, no cap.

💅 RETURN 💅

She returns the peer's logical port number or a negative value indicating an error. If you see negative, that's your signal that something went sideways — not a vibe. 💀

👑 SEE ALSO 👑

The kernel file ./include/linux/ntb.h is the home base, and the whole friend group is: enum ntb_topo(9), enum ntb_speed(9), enum ntb_width(9), enum ntb_default_port(9), struct ntb_client_ops(9), struct ntb_ctx_ops(9), struct ntb_dev_ops(9), struct ntb_client(9), struct ntb_dev(9), ntb_register_client(9), ntb_unregister_client(9), ntb_register_device(9), ntb_unregister_device(9), ntb_set_ctx(9), ntb_clear_ctx(9), ntb_link_event(9), ntb_db_event(9), ntb_msg_event(9), ntb_default_port_number(9), ntb_default_peer_port_count(9), ntb_default_peer_port_number(9), ntb_default_peer_port_idx(9), ntb_port_number(9), ntb_peer_port_count(9), ntb_peer_port_number(9), ntb_logical_port_number(9), ntb_peer_port_idx(9), ntb_link_is_up(9), ntb_link_enable(9), ntb_link_disable(9), ntb_mw_count(9), ntb_mw_get_align(9), ntb_mw_set_trans(9), ntb_mw_clear_trans(9), ntb_peer_mw_count(9), ntb_peer_mw_get_addr(9), ntb_peer_mw_set_trans(9), ntb_peer_mw_clear_trans(9), ntb_db_is_unsafe(9), ntb_db_valid_mask(9), ntb_db_vector_count(9), ntb_db_vector_mask(9), ntb_db_read(9), ntb_db_set(9), ntb_db_clear(9), ntb_db_read_mask(9), ntb_db_set_mask(9), ntb_db_clear_mask(9), ntb_peer_db_addr(9), ntb_peer_db_read(9), ntb_peer_db_set(9), ntb_peer_db_clear(9), ntb_peer_db_read_mask(9), ntb_peer_db_set_mask(9), ntb_peer_db_clear_mask(9), ntb_spad_is_unsafe(9), ntb_spad_count(9), ntb_spad_read(9), ntb_spad_write(9), ntb_peer_spad_addr(9), ntb_peer_spad_read(9), ntb_peer_spad_write(9), ntb_msg_count(9), ntb_msg_inbits(9), ntb_msg_outbits(9), ntb_msg_read_sts(9), ntb_msg_clear_sts(9), ntb_msg_set_mask(9), ntb_msg_clear_mask(9), ntb_msg_read(9), ntb_peer_msg_write(9), ntb_get_dma_dev(9), ntb_peer_resource_idx(9), ntb_peer_highest_mw_idx(9).

mwah 💖 that's the whole page, bestie. Source/version: ./include/linux; date: October 2026; manual name: ntb_peer_log..._port_number(9). Go slay those logical ports 👑✨