wait_logical_linkstate(9)

💅 wait_logical_linkstate — Kernel API Manual, section 9

okay bestie, welcome to wait_logical_linkstate(9) — the kernel API page where we all just sit around waiting for an IB link to get its life together 🌀✨

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✨ NAME ✨

wait_logical_linkstate — literally just waiting for an IB link state change to occur 🫶

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🌸 SYNOPSIS 🌸

int wait_logical_linkstate (struct hfi1_pportdata *ppd , u32 state , int
msecs );

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🎀 ARGUMENTS 🎀

• ppd — the port device, aka the main character we're checking on 👑
• state — the state we're waiting for, the vibe we're manifesting 🦋
• msecs — how many milliseconds we're willing to wait, our patience budget ⏳

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💖 DESCRIPTION 💖

So here's the tea: this function waits up to msecs milliseconds for an IB link state change to occur. For now, it takes the easy polling route — no fancy interrupts, no event notifications, just good old-fashioned checking-in-a-loop energy 🙈

It returns 0 if the state was reached, otherwise it hands you back -ETIMEDOUT 😭 (the state did not arrive, and honestly? rude of it).

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🦋 SEE ALSO 🦋

• Kernel file ./drivers/infiniband/hw/hfi1/chip.c — go read the source, iykyk 📖
• hfi1_addr_from_offset(9)
• read_csr(9)
• write_csr(9)
• get_csr_addr(9)
• update_xmit_counters(9)
• apply_link_downgrade_policy(9)
• is_rcv_avail_int(9)
• is_rcv_urgent_int(9)
• general_interrupt(9)
• hfi1_rcd_eoi_intr(9)
• hfi1_netdev_rx_napi(9)
• data_vls_operational(9)
• encode_rcv_header_entry_size(9)
• hfi1_validate_rcvhdrcnt(9)
• set_hdrq_regs(9)
• update_statusp(9)
• read_mod_write(9)
• set_intr_bits(9)
• set_up_interrupts(9)
• hfi1_get_qp_map(9)
• init_qpmap_table(9)
• init_qos(9)
• hfi1_init_dd(9)
• create_pbc(9)

like, twenty-four whole cross-references, a full friend group fr fr 💀💜

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ngl if you're waiting on a state that never shows up, you're getting -ETIMEDOUT and that's just the situation 💅

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🌈 and that's the page!! brought to you by ./drivers/infiniband/hw/hfi1, dated October 2026 — mwah, slay, periodt 🎀✨💖