check_ring_db(9)

💅 check_ring_db(9) 💅

okay so bestie, this page is from the Kernel API Manual, and it's all about check_ring_db — the little helper that does a doorbell vibe check. No cap, the facts are staying exactly as they are. 🫶

✨ NAME ✨

check_ring_db — check if we need to ring any doorbells 🔔

🌸 SYNOPSIS 🌸

void check_ring_db (struct adapter *adap , struct sge_qset *qs ,
       unsigned int sleeping );

🎀 ARGUMENTS 🎀

• adap — the adapter 💖
• qs — the queue set whose Tx queues are to be examined 👀
• sleeping — indicates which Tx queue sent GTS 💤

🦋 DESCRIPTION 🦋

okay so here's the tea: this checks if some of a queue set's Tx queues need to ring their doorbells to resume transmission after idling while they still have unprocessed descriptors. That's literally the whole mission, and it ate. ✨

💖 SEE ALSO 💖

these all live in the Kernel file ./drivers/net/ethernet/chelsio/cxgb3/sge.c — and yes, the whole squad is here:

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), 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_dma(9), t3_sge_stop(9), t3_sge_init(9), t3_sge_prep(9)

source/version: ./drivers/net/ethernet/chelsio... · date: October 2026 · still serving check_ring_db(9) realness, bestie 🫶💅