skb_txq(9)

💅 skb_txq(9) — like, the kernel API manual, bestie 🎀

okay so picture this: we're in the skb_txq(9) page of the Kernel API Manual, and it's short but it matters, iykyk.

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✨ NAME ✨

skb_txq — returns the Tx queue that an offload packet should use 🦋

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🌸 SYNOPSIS 🌸

unsigned int skb_txq (const struct sk_buff *skb );

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🎀 ARGUMENTS 🎀

• skb — bestie, this is the packet. that's it, that's the whole argument 💖

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👑 DESCRIPTION 👑

So the vibe is: this function returns the Tx queue that an offload packet should use, and the way it knows is by peeking at bits 1–15 in the packet's queue_mapping. literally that's the source of truth. slay. ✨

ngl, bits 1–15, not 0–15 — read it again, it's giving very specific 💅

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🔥 SEE ALSO 🔥

the way this page has, like, the entire cxgb4 friend group tagged... main character energy fr fr:

• Kernel file ./drivers/net/ethernet/chelsio/cxgb4/sge.c
• 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)
• ofldtxq_stop(9)
• service_ofldq(9)
• ofld_xmit(9)
• restart_ofldq(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)

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that's the whole page, no cap 💀 short and iconic. source/version line says ./drivers/net/ethernet/chelsio... and it's dated October 2026 — so yeah, skb_txq(9), Kernel API Manual, October 2026, mwah 😘 🫶 go read txq_avail(9) next, she's right there ⭐