ctrl_xmit(9)

💖 ctrl_xmit(9) — Kernel API Manual 💖

okay so quick vibe check: this page is literally ctrl_xmit(9) from the Kernel API Manual, and she's here to explain one very specific little send. periodt. 💅

✨ NAME ✨

ctrl_xmit — send a packet through an SGE control Tx queue 🦋

🎀 SYNOPSIS 🎀

int ctrl_xmit (struct sge_ctrl_txq *q , struct sk_buff *skb );

🌸 ARGUMENTS 🌸

• q — the control queue. she's the queue in question, bestie 💖
• skb — the packet. the actual packet being sent ✨

🦋 DESCRIPTION 🦋

okay so ctrl_xmit sends a packet through an SGE control Tx queue. that's the main character move 🎀

but here's the important vibe check: packets sent through a control queue must fit entirely as immediate data. no cap, the whole packet has to fit entirely as immediate data. 💀✨

🌈 SEE ALSO 🌈

Kernel file ./drivers/net/ethernet/chelsio/cxgb4/sge.c, plus all these iconic little references:

• 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)
• restart_ctrlq(9)
• t4_mgmt_tx(9)
• is_ofld_imm(9)
• calc_tx_flits_ofld(9)
• txq_stop_maperr(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)

that's the tea, bestie 🍓 source/version is ./drivers/net/ethernet/chelsio..., date is October 2026, and the page is literally ctrl_xmit(9). mwah 💋✨