service_ofldq(9)

🦋 service_ofldq(9) — like, the Kernel API Manual page you didn't know you needed 🦋

okay bestie, welcome to a lil corner of the Kernel API Manual where we talk about service_ofldq, which is literally the glow-up your suspended offload queue has been waiting for. it services/restarts it. periodt. 💅

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✨ NAME ✨

service_ofldq — service/restart a suspended offload queue 🎀

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🌸 SYNOPSIS 🌸

void service_ofldq (struct sge_uld_txq *q );

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🫶 ARGUMENTS 🫶

• q — the offload queue. that's the one. the main character. ✨

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💖 DESCRIPTION 💖

so what does it actually do? it services an offload Tx queue by moving packets from its Pending Send Queue onto the Hardware TX ring. slay. 🔥

here's the fun part (the vibe-y part, iykyk): the function starts and ends with the Send Queue locked, but it drops the lock while it's putting the skb at the head of the Send Queue onto the Hardware TX Ring. why would it do that? because dropping the lock lets more skbs get added to the Send Queue by other threads. it's giving generosity. it's giving "come thru, other threads." 🙈

and the packet being processed at the head of the Pending Send Queue? it gets left on the queue — just in case we hit DMA Mapping errors, etc., and need to give up and restart later. no cap, it's a safety net. 🧚

think of service_ofldq as a task that opportunistically uses other threads' execution contexts. we use the Offload Queue boolean "service_ofldq_running" to make sure only one instance is ever running at a time ... 👑

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🔥 SEE ALSO 🔥

okay this list is long long, but we don't skip, we don't scroll past, we appreciate every single one of these icons. 💜

first up, the source file: Kernel file ./drivers/net/ethernet/chelsio/cxgb4/sge.c

• txq_avail(9)
• fl_cap(9)
• fl_starving(9)
• deferred_unmap_destructor(9)
• free_tx_desc(9)
• reclaim_completed_tx(9)
• cxgb4_reclaim_completed_tx(9)
• free_rx_bufs(9)
• unmap_rx_buf(9)
• refill_fl(9)
• alloc_ring(9)
• sgl_len(9)
• flits_to_desc(9)
• is_eth_imm(9)
• calc_tx_flits(9)
• cxgb4_write_sgl(9)
• cxgb4_ring_tx_db(9)
• cxgb4_inline_tx_skb(9)
• t4_sge_eth_txq_egress_update(9)
• cxgb4_eth_xmit(9)
• t4vf_is_eth_imm(9)
• t4vf_calc_tx_flits(9)
• cxgb4_vf_eth_xmit(9)
• reclaim_completed_tx_imm(9)
• cxgb4_ethofld_send_flowc(9)
• is_imm(9)
• ctrlq_check_stop(9)
• ctrl_xmit(9)
• restart_ctrlq(9)
• t4_mgmt_tx(9)
• is_ofld_imm(9)
• calc_tx_flits_ofld(9)
• txq_stop_maperr(9)
• ofldtxq_stop(9)
• ofld_xmit(9)
• restart_ofldq(9)
• skb_txq(9)
• is_ctrl_pkt(9)
• t4_ofld_send(9)
• cxgb4_ofld_send(9)
• ofld_xmit_direct(9)
• t4_crypto_send(9)
• cxgb4_crypto_send(9)
• cxgb4_pktgl_to_skb(9)
• t4_pktgl_free(9)
• cxgb4_sgetim_to_hwtstamp(9)
• t4_systim_to_hwstamp(9)
• t4_rx_hststamp(9)
• t4_tx_hststamp(9)
• t4_tx_completion_handler(9)
• t4_ethrx_handler(9)
• restore_rx_bufs(9)
• is_new_response(9)
• rspq_next(9)
• process_responses(9)
• napi_rx_handler(9)
• t4_intr_handler(9)
• bar2_address(9)
• t4_sge_alloc_eth_txq(9)
• t4_free_sge_resources(9)
• t4_sge_stop(9)
• t4_sge_init_soft(9)
• t4_sge_init(9)

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okay that's the whole page bestie, go forth and service those queues 💅✨

🎀 cute lil sign-off: this page lives at ./drivers/net/ethernet/chelsio... and it's dated October 2026 — yes, from the future, we're iconic like that. mwah. 🫶💖