sge_tx_timer_cb(9)

💅 sge_tx_timer_cb(9) — from the Kernel API Manual, bestie ✨

Okay so this is a page from the Kernel API Manual, and it's all about sge_tx_timer_cb — say that three times fast, I dare you 🫶. Buckle up, it's giving "small function, big job" energy.

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🌸 NAME 🌸

sge_tx_timer_cb — perform periodic maintenance of SGE Tx queues

Like, it's a timer callback whose whole personality is keeping the SGE Tx queues tidy. Periodically. That's the vibe check and it passed 🔥

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✨ SYNOPSIS ✨

void sge_tx_timer_cb (struct timer_list *t );

That's it. That's the whole signature. Void return, one arg, no drama 💅 (well, technically the formatting has a lil space before the ) — we keep it exactly as-is, no cap, because code is sacred 🎀)

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🎀 ARGUMENTS 🎀

• t — the Tx timer. That's the timer that fires off this whole operation. It's literally the main character of this function, bestie 👑

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🦋 DESCRIPTION 🦋

So here's the tea ☕: this thing runs periodically from a timer to perform maintenance of SGE TX queues. That's the whole mission statement. Lowkey humble, highkey essential.

Then it gets specific:

• b) — Reclaims completed Tx packets for the Ethernet queues. Normally, packets get cleaned up by new Tx packets — like, the new ones do the tidying as they come through, super efficient ✨. But this timer is the one that steps in and cleans up packets when no new packets are being submitted. Nobody's coming through? Cool, the timer handles it. It's the friend who does the dishes when everyone else ghosted the group chat 🫶.

Ngl, the page is very clear that this is essential for pktgen, at least. Like, don't skip this, fr fr 😭

(And yeah, before you @ me — the list literally starts at b). We don't know where a) went. We don't ask. We respect the mystery 🙈)

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🌈 SEE ALSO 🌈

Buckle up babes, this is a long one. The kernel file lives here:

• Kernel file ./drivers/net/ethernet/chelsio/cxgb4vf/sge.c

And then the whole friend group 👯‍♀️:

get_buf_addr(9), is_buf_mapped(9), need_skb_unmap(9), txq_avail(9), fl_cap(9), fl_starving(9), map_skb(9), free_tx_desc(9), reclaim_completed_tx(9), get_buf_size(9), free_rx_bufs(9), unmap_rx_buf(9), ring_fl_db(9), set_rx_sw_desc(9), refill_fl(9), alloc_ring(9), sgl_len(9), flits_to_desc(9), is_eth_imm(9), calc_tx_flits(9), write_sgl(9), ring_tx_db(9), inline_tx_skb(9), t4vf_eth_xmit(9), copy_frags(9), t4vf_pktgl_to_skb(9), t4vf_pktgl_free(9), do_gro(9), t4vf_ethrx_handler(9), is_new_response(9), restore_rx_bufs(9), rspq_next(9), process_responses(9), napi_rx_handler(9), t4vf_intr_handler(9), sge_rx_timer_cb(9), bar2_address(9), t4vf_sge_alloc_rxq(9), t4vf_sge_alloc_eth_txq(9), t4vf_free_sge_resources(9), t4vf_sge_start(9), t4vf_sge_stop(9), t4vf_sge_init(9)

Every single one of them, present and accounted for 💖 Not a single reference dropped, because we don't do that here 🎀

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So that's the page! Source and version: ./drivers/net/ethernet/chelsio... — dated October 2026 — and it's all filed under sge_tx_timer_cb(9). Go forth, reclaim those Tx packets, and slay 💅✨🔥