update_xmit_counters(9)

💖 update_xmit_counters(9) 💖

okay bestie, welcome to the Kernel API Manual — yes, that's the manual name, and yes, we're doing kernel internals today 🎀 this one lives in section 9 and it's a function page, so buckle up.

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✨ NAME ✨

update_xmit_counters — literally just updates the PortXmitWait and PortVlXmitWait counters. that's the whole vibe 🫶

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🌸 SYNOPSIS 🌸

void update_xmit_counters (struct hfi1_pportdata *ppd , u16 link_width
);

so it's void (nothing comes back, no receipts 💅), it takes two things, and it lives on one line if you squint. iconic formatting honestly.

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🦋 ARGUMENTS 🦋

• ppd — the info of physical Hfi port 👑 this is your port's whole deal, its little profile.
• link_width — a u16 holding the new link width after a link up or a downgrade. so like, the glow-up (or the glow-down 😭) number.

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⭐ DESCRIPTION ⭐

okay so here's the tea: this function updates the PortXmitWait and PortVlXmitWait counters after a link up or downgrade event happens, so those counters actually reflect the link width change. no cap — if the width changed, the counters gotta know about it, and this is the function that tells them 💖

that's it. that's the whole job. main character energy, minimal code, maximum purpose ✨

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🔥 SEE ALSO 🔥

bestie you know we have to list every single one of these, and we're not skipping a single crumb 🍓

and the kernel file itself lives at ./drivers/infiniband/hw/hfi1/chip.c — that's the source, go look at it, iykyk 👀

• hfi1_addr_from_offset(9)
• read_csr(9)
• write_csr(9)
• get_csr_addr(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)
• wait_logical_linkstate(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)

twenty-four whole references, we ate that list UP 😤💅

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🧚 friendly reminder that this page is part of the Kernel API Manual, so like… it's real kernel business. treat it with respect (but also love it).

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and that's the whole page, bestie!! brought to you by ./drivers/infiniband/hw/hfi1 and dated October 2026 — mwah 💋 slay, bye! 🌈💜