txq_stop_maperr(9)

✨ NAME ✨

okay so this is txq_stop_maperr from the Kernel API Manual — stop a Tx queue due to I/O MMU exhaustion. That's the whole vibe, periodt. 💅

🦋 SYNOPSIS 🦋

void txq_stop_maperr (struct sge_uld_txq *q );

🎀 ARGUMENTS 🎀

• q — the queue to stop. That's it, bestie. 🫶

💅 DESCRIPTION 💅

So txq_stop_maperr marks a Tx queue stopped due to I/O MMU exhaustion and the resulting inability to map packets. A periodic timer attempts to restart queues so marked. No cap, that's literally the whole little maneuver. ✨

🌈 SEE ALSO 🌈

The kernel file is ./drivers/net/ethernet/chelsio/cxgb4/sge.c. The whole (9) squad, bestie — every single one:

• 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)
• ofldtxq_stop(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)

okay bye bestie 💖 — source/version: ./drivers/net/ethernet/chelsio..., date: October 2026. txq_stop_maperr(9) out! 🌈💅