ring_fl_db(9)

💅 ring_fl_db(9) — the Kernel API Manual, bestie edition 🎀

okay so we're in the Kernel API Manual today and the star of the show is ring_fl_db(9), from the ring_fl_db page. buckle up, it's a short one but it's iconic 💖

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✨ NAME ✨

ring_fl_db — righ doorbell on free list 🛎️

(yes, "righ". that's literally what the page says. not me, not a typo I made, we're keeping it fr fr 💀)

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🌸 SYNOPSIS 🌸

void ring_fl_db (struct adapter *adapter , struct sge_fl *fl );

it returns void, meaning it gives you nothing back and expects nothing from you — pure main character energy, no notes 👑

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🦋 ARGUMENTS 🦋

• adapter — the adapter. that's it, that's the description, the manpage is being mysterious and honestly? respect 🙈
• fl — the Free List whose doorbell should be rung ... (the trailing ... is doing a lot of heavy lifting here, iykyk 😭)

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🌈 DESCRIPTION 🌈

so what does it do? it tells the Scatter Gather Engine that there are new free list entries available ✨

that's the whole thing. you're basically sliding into the SGE's DMs like "hey bestie, fresh buffers just dropped" and the Scatter Gather Engine is like "say less" 🫶

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⭐ SEE ALSO ⭐

Kernel file ./drivers/net/ethernet/chelsio/cxgb4vf/sge.c — go read the source, it's giving lore 👑

and the whole extended friend group, no one left out (this is a group chat, everybody gets @'d):

• get_buf_addr(9), is_buf_mapped(9), need_skb_unmap(9), txq_avail(9),
• fl_cap(9), fl_starving(9), map_skb(9), free_tx_desc(9),
• reclaim_completed_tx(9), get_buf_size(9), free_rx_bufs(9),
• unmap_rx_buf(9), set_rx_sw_desc(9), refill_fl(9), alloc_ring(9),
• sgl_len(9), flits_to_desc(9), is_eth_imm(9), calc_tx_flits(9),
• write_sgl(9), ring_tx_db(9), inline_tx_skb(9), t4vf_eth_xmit(9),
• copy_frags(9), t4vf_pktgl_to_skb(9), t4vf_pktgl_free(9), do_gro(9),
• t4vf_ethrx_handler(9), is_new_response(9), restore_rx_bufs(9),
• rspq_next(9), process_responses(9), napi_rx_handler(9),
• t4vf_intr_handler(9), sge_rx_timer_cb(9), sge_tx_timer_cb(9),
• bar2_address(9), t4vf_sge_alloc_rxq(9), t4vf_sge_alloc_eth_txq(9),
• t4vf_free_sge_resources(9), t4vf_sge_start(9), t4vf_sge_stop(9),
• t4vf_sge_init(9)

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heads up bestie: this page has literally no OPTIONS, no ENVIRONMENT, no EXIT STATUS, no ERRORS, no BUGS section. it's a tiny little function and it knows it. don't go looking for sections that aren't there 💅

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and that's the whole page!! 🎀 mwah 💋

cute little sign-off: this one lives at ./drivers/net/ethernet/chelsio... and it's dated October 2026, page ring_fl_db(9) — see you in the next release, slay 🦋✨