ntb_mw_count(9)

💖 ntb_mw_count(9) — Kernel API Manual, bestie edition 💖

okay so bestie, welcome to the ntb_mw_count(9) page from the Kernel API Manual ✨ This one is literally about counting inbound memory windows you could create for a specified peer device, and it’s giving short-and-iconic 🌸 Let’s go 🫶

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🌟 NAME 🌟

ntb_mw_count — get the number of inbound memory windows, which could be created for a specified peer device 🎀

✨ SYNOPSIS ✨

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

That’s the whole signature, bestie — no cap. 💅

🎀 ARGUMENTS 🎀

• ntb — NTB device context. Like, the context for the NTB device itself 🌀
• pidx — Port index of peer device. the peer device’s port index, periodt 📌

🦋 DESCRIPTION 🦋

Hardware and topology may support a different number of memory windows. Moreover, different peer devices can support different number of memory windows. Simply speaking, this method returns the number of possible inbound memory windows to share with specified peer device. 🪟✨

Note: this may return zero if the link is not up yet. So if you get a 0 before the link is ready, that’s the vibe — don’t spiral 💀

💫 RETURN 💫

the number of memory windows. 🎉 That’s the return value, bestie — count ’em and slay 💅

🌈 SEE ALSO 🌈

Kernel file ./include/linux 📁 Now go read these icons, iykyk:

• 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_logical_port_number(9)
• ntb_peer_port_idx(9)
• ntb_link_is_up(9)
• ntb_link_enable(9)
• ntb_link_disable(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)

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xoxo, this page is sourced from the ./include/linux source/version and dated October 2026 — bye bestie, go count those windows! 💖🦋✨