t3_sge_stop_dma(9)

💖 t3_sge_stop_dma(9) 💖

okay bestie, so this one's from the Kernel API Manual, section 9 — kernel API land 🎀 — and it's a tiny little function with a big job. let's get into it ✨

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🌸 NAME 🌸

t3_sge_stop_dma — the girlie whose entire personality is Disable SGE DMA engine operation 💅

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✨ SYNOPSIS ✨

void t3_sge_stop_dma (struct adapter *adap );

that's it. that's the whole signature. no return value, we're giving nothing back, main character energy only 👑

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🦋 ARGUMENTS 🦋

• adap — the adapter 💜 literally just the adapter, that's the assignment, that's the whole assignment.

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🔥 DESCRIPTION 🔥

so the vibe check here is: this function Can be invoked from interrupt context — like, for example, from the error handler 😭 it's built different, it works from interrupt context, no cap.

but — and this is the important part — Note that this function cannot disable the restart of works 😬 because it cannot wait when it's called from interrupt context. it's literally not allowed to sit there and wait, that's not her life.

now the slay part: the works will have no effect anyway, because the doorbells are disabled 🔕✨ periodt. so those works are out here showing up dressed for a party that isn't happening.

the driver will call tg3_sge_stop later, from process context 🧚 at which time the works will be stopped if they're still running. so like. she'll handle it later. it's fine. it's giving delegation 💅

⚠️ real talk: if you were expecting this function to fully shut everything down, that is not the gig — it can't wait from interrupt context, so it doesn't. the actual stopping happens later in tg3_sge_stop. don't @ me, that's just what the page says 🫶

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⭐ SEE ALSO ⭐

the whole squad fr fr, all from Kernel file ./drivers/net/ethernet/chelsio/cxgb3/sge.c 🌈:

• refill_rspq(9), need_skb_unmap(9), unmap_skb(9), free_tx_desc(9), reclaim_completed_tx(9)
• should_restart_tx(9), free_rx_bufs(9), add_one_rx_buf(9), refill_fl(9), recycle_rx_buf(9)
• alloc_ring(9), t3_reset_qset(9), t3_free_qset(9), init_qset_cntxt(9), sgl_len(9)
• flits_to_desc(9), get_packet(9), get_packet_pg(9), get_imm_packet(9), calc_tx_descs(9)
• write_sgl(9), check_ring_tx_db(9), write_wr_hdr_sgl(9), write_tx_pkt_wr(9), t3_eth_xmit(9)
• write_imm(9), check_desc_avail(9), reclaim_completed_tx_imm(9), ctrl_xmit(9), restart_ctrlq(9)
• deferred_unmap_destructor(9), write_ofld_wr(9), calc_tx_descs_ofld(9), ofld_xmit(9), restart_offloadq(9)
• queue_set(9), is_ctrl_pkt(9), t3_offload_tx(9), offload_enqueue(9), deliver_partial_bundle(9)
• ofld_poll(9), rx_offload(9), restart_tx(9), cxgb3_arp_process(9), rx_eth(9)
• lro_add_page(9), handle_rsp_cntrl_info(9), check_ring_db(9), is_new_response(9), process_responses(9)
• napi_rx_handler(9), process_pure_responses(9), handle_responses(9), t3_intr_handler(9), t3_sge_err_intr_handler(9)
• sge_timer_tx(9), sge_timer_rx(9), t3_update_qset_coalesce(9), t3_sge_alloc_qset(9), t3_start_sge_timers(9)
• t3_stop_sge_timers(9), t3_free_sge_resources(9), t3_sge_start(9), t3_sge_stop(9)
• t3_sge_init(9), t3_sge_prep(9)

like, the entire extended friend group 😭💀 go read them, iykyk 🍓

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and that's the page babe 💖 it ships out of ./drivers/net/ethernet/chelsio... and it's dated October 2026 — so like, future queen behavior 🌸✨ mwah, ily, go disable some DMA 💅🎀