sge_timer_rx(9)

💅 sge_timer_rx(9) — the Kernel API Manual glow-up 🎀

okay so bestie, welcome to the Kernel API Manual entry for sge_timer_rx ✨ this is the little timer callback that keeps your SGE qset looking fresh — think of it as the scheduled self-care appointment for your queue set 💖

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✨ NAME ✨

sge_timer_rx — does the periodic maintenance on an SGE qset, no cap 🧚

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🌸 SYNOPSIS 🌸

void sge_timer_rx (struct timer_list *t );

literally one argument, one return type, void all the way, slay 💅

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🦋 ARGUMENTS 🦋

• t — the timer list that's holding the SGE queue set we're supposed to maintain, iykyk 🫶

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🔥 DESCRIPTION 🔥

so there's basically two whole jobs happening in here, and both of them are iconic in their own way:

a) It replenishes Rx queues that have run out of buffers because of a memory shortage 😭 normally new Rx buffers get added whenever the existing ones get consumed, but when you're out of memory a queue can just... go empty. which is a vibe check nobody wants. so we try to add only a few buffers here — not the whole stash — and then the queue gets replenished fully as those new buffers get used up, but only if the memory shortage has subsided by then. patient queen behavior 👑

b) It returns coalesced response queue credits, in case a response queue is starved 🍓 like, handing back the credits so the poor thing can breathe again.

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👑 SEE ALSO 👑

the whole friend group, fr fr — they all 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), 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), 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)

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not me ending this with the lil footer crumbs 🥺 the source path got cut off as ./drivers/net/ethernet/chelsio... and the date on the page is October 2026 — that's the whole sign-off bestie, mwah 💋 periodt ✨💜