ntb_register_device(9)

💅 ntb_register_device — the ntb_register_device(9) page, but make it make sense

okay so bestie, we're in the Kernel API Manual today and the main character is ntb_register_device. it's a kernel function, it's nine-section, it's iconic, let's go 🎀

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✨ NAME ✨

ntb_register_device — register a ntb device 💖

like, you have a NTB device, and now the kernel knows about it. slay.

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🌸 SYNOPSIS 🌸

int ntb_register_device (struct ntb_dev *ntb );

no cap, that's the whole signature. int in, int out, one pointer, very demure, very mindful 🦋

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🫶 ARGUMENTS 🫶

• ntb — NTB device context. that's it. that's the argument. it's the device you're registering, the main character of this whole operation 👑

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💫 DESCRIPTION 💫

so here's the tea, bestie 🍓

the device gets added to the list of ntb devices. that's step one, that's the vibe.

and if any clients are interested in ntb devices — and some of them are, they're lurking — then each client gets notified about the ntb device. one by one. until at most one client accepts the device. and then it stops, because we're not doing a whole group-chat pile-on here. one client. that's the limit. periodt 💅

at most one client accepts it — write that down fr fr, it's the whole personality of this function ✨

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🔥 RETURN 🔥

• 0 — zero! the device is registered. you ate. 🎉
• otherwise an error number — something went sideways, and you get an error number back. 😭

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👑 SEE ALSO 👑

the whole squad. every single one of them. no skipping, we don't do that here 💜

Kernel file ./include/linux/ntb.h

• 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_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_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)

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okay that's the page!! go register your device, bestie, it's giving kernel maintainer energy 🌈🧚

little sign-off from the bottom of the page: this one lives in ./include/linux and it's dated October 2026. iykyk 💜