ntb_db_is_unsafe(9)

✨ NAME ✨

Hiii bestie, welcome to ntb_db_is_unsafe(9) — the Kernel API Manual page that checks whether it is safe to use hardware doorbell. Yes, doorbell. Hardware drama is real. 💅

🌸 SYNOPSIS 🌸

int ntb_db_is_unsafe (struct ntb_dev *ntb );

That space before the closing paren is canon, okay? Do not come for me. 🫶

🎀 ARGUMENTS 🎀

• ntb — NTB device context. It's the device context you're asking about, and yes, it's doing main character energy in this call.

🦋 DESCRIPTION 🦋

Okay so here's the tea: some ntb hardware can be affected by errata. Not vibe. Hardware drivers can advise clients to avoid using doorbells. Clients may ignore this advice, though caution is recommended.

So like, the driver is giving a very valid "bestie maybe don't" — not a whole personality change. Caution is still the move. ⭐

🔥 RETURN 🔥

It returns Zero if it is safe to use doorbells, or One if it is not safe.

Zero = doorbell green light. One = nope, not safe. Periodt. 💀

💖 SEE ALSO 💖

Kernel file ./include/linux/ntb.h, plus the whole extended universe: 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_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_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).

That's the whole page, bestie. Source/version: ./include/linux. Date: October 2026. ntb_db_is_unsafe(9) out — go check those doorbells responsibly. 💜✨