rx_eth(9)

💅 rx_eth(9) — Kernel API Manual 🎀

okay so bestie, we're in the kernel API manual today and the star of the show is rx_eth — she processes an ingress ethernet packet, and honestly? she ate. ✨

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🌸 SYNOPSIS 🌸

void rx_eth (struct adapter *adap , struct sge_rspq *rq , struct sk_buff
*skb , int pad , int lro );

like, that's the whole vibe. five params, no notes, no return value (she's void, she gives nothing back and that's her main character energy 💅).

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🦋 ARGUMENTS 🦋

• adap — the adapter. literally the NIC's whole personality lives in here, iykyk.
• rq — the response queue that received the packet. she's the one who caught it, so respect her 😤
• skb — the packet itself. the moment. the icon.
• pad — padding. yes it's called pad. yes it matters, keep reading ✨
• lro — large receive offload. the vibes-coalescing parameter 🫶

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💖 DESCRIPTION 💖

so what she does is: process an ingress ethernet packet and deliver it to the stack. that's the job, that's the whole assignment, and she does it. periodt. 🔥

and here's the little detail that lives rent free in my head — the padding is 2 if the packet was delivered in an Rx buffer, and 0 if it was immediate data in a response. not 1. not "whatever". 2 or 0, bestie. memorize it, it's giving exam question 🎀

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👑 SEE ALSO 👑

okay this list is long and every single one of these is iconic in her own right, so let's not disrespect anyone by skipping 💜 — all of these live in the kernel file ./drivers/net/ethernet/chelsio/cxgb3/sge.c:

• 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)
• 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)

that's the whole group chat, no one left on read 💀

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ngl bestie, this page is short but she said everything she needed to say. no cap.

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and that's the tea 🍓 — this drop is from ./drivers/net/ethernet/chelsio..., dated October 2026, so it's fresh, it's cute, it's the rx_eth(9) manual. slay 💖✨