ofldtxq_stop(9)

👑 ofldtxq_stop(9) — the Kernel API Manual, but make it make sense

okay so before we even start, quick vibe check: this is a page from the Kernel API Manual (yes, the kernel, your fave, the final boss of C code) and it's about ONE tiny function doing ONE iconic thing. it's giving "small but mighty" and honestly? we're obsessed 💅

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✨ NAME ✨

ofldtxq_stop — stops an offload Tx queue when it's gone full, like a club at capacity 🎀

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🦋 SYNOPSIS 🦋

void ofldtxq_stop (struct sge_uld_txq *q , struct fw_wr_hdr *wr );

literally no return value, no drama, it just does the thing and leaves. main character energy fr 🔥

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🌸 ARGUMENTS 🌸

• q — the queue we're stopping. the one that's full. the one that needs to chill 💀
• wr — the Work Request that's the whole reason the queue became full in the first place. iykyk 🫶

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💖 DESCRIPTION 💖

okay bestie, so picture this: an offload Tx queue has become full — like, no room left, absolutely packed, standing room only 😭

ofldtxq_stop stops that queue. and it doesn't just stop it — it modifies the packet being written so it requests a wakeup. so when there's space again, someone'll get nudged. not me forgetting to ping you back, that's for sure ✨

so the two things it does, for the note-takers:

• stops an offload Tx queue that has become full
• modifies the packet being written to request a wakeup

periodt. that's the function. simple, effective, ate 👑

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🌈 SEE ALSO 🌈

this is the part where the page just goes OFF with the links, and honestly? respect. no gatekeeping here. every single one, in order, exactly as listed 🔥

• 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)
• service_ofldq(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)

and just so you have the source location too, the kernel file is:

./drivers/net/ethernet/chelsio/cxgb4/sge.c

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ngl this whole page lives in ./drivers/net/ethernet/chelsio/cxgb4/sge.c — that's the origin story, bestie, don't lose it 💜

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okay that's the whole page, no notes 💖 before you go: this beauty came from ./drivers/net/ethernet/chelsio... (that's the source/version line, slightly shy and abbreviated but we love it anyway 🥺), dated October 2026, and it's filed under ofldtxq_stop(9). slay, go stop a queue responsibly 🎀✨