write_tx_pkt_wr(9)

💅 write_tx_pkt_wr(9) — ok bestie, we're writing a TX_PKT work request

So this is a page from the Kernel API Manual, and it's about write_tx_pkt_wr — the function that literally generates a TX_PKT work request. Yes, that's the whole vibe. Let's get into it 🎀

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✨ NAME ✨

write_tx_pkt_wr — write a TX_PKT work request. That's it, that's the name, no notes 💅

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🌸 SYNOPSIS 🌸

void write_tx_pkt_wr (struct adapter *adap , struct sk_buff *skb , const
     struct port_info *pi , unsigned int pidx , unsigned int gen , struct
     sge_txq *q , unsigned int ndesc , unsigned int compl , const dma_addr_t
     *addr );

Like, look at all those arguments. She's got range 🫶

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🦋 ARGUMENTS 🦋

• adap — the adapter. the main character of this whole operation, honestly.
• skb — the packet to send. the actual message, the payload, the reason we're all here 💌
• pi — the egress interface. it's giving "which door does this packet leave through".
• pidx — index of the first Tx descriptor to write. like, where do we even start writing. that's this.
• gen — the generation value to use. lowkey sounds mystical but it's just a value and we love her.
• q — the Tx queue. the line the packet is standing in.
• ndesc — number of descriptors the packet will occupy. how much space she's taking up, no cap.
• compl — the value of the COMPL bit to use. yes, specifically the COMPL bit. iconic flag behavior.
• addr — address. short, sweet, exactly as documented 🙈

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🎀 DESCRIPTION 🎀

Generate a TX_PKT work request to send the supplied packet.

That's the whole job. It's not deep, bestie, but it is essential — you hand over the packet, this function does the generating. periodt. ✨

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🔥 SEE ALSO 🔥

Ok so this function has, like, so many friends. All of these live in the kernel file ./drivers/net/ethernet/chelsio/cxgb3/sge.c, and here they all are — every single one, because we do not skip the list in this house 💖

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

fr fr that's the whole crew. go read them, they're all right there in ./drivers/net/ethernet/chelsio/cxgb3/sge.c 🧚

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And that's the page, bestie 🌈 This lil' rewrite came to you from ./drivers/net/ethernet/chelsio..., dated October 2026 — mwah, take care of her, she's got write_tx_pkt_wr(9) energy and we're obsessed 💜👑