tn40_create_rx_ring(9)

💖 tn40_create_rx_ring(9) — the Kernel API Manual glow-up 🎀

okay so bestie, we're in the tn40_create_rx_ring(9) page of the Kernel API Manual and honestly? it's giving "let me set up your whole RX life" energy. sit down, grab a strawberry drink 🍓, and let's get into it.

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✨ NAME ✨

tn40_create_rx_ring — literally initializes all the RX-related HW and SW resources. all of them. the whole vibe. 💅

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🌸 SYNOPSIS 🌸

int tn40_create_rx_ring (struct tn40_priv *priv );

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🦋 ARGUMENTS 🦋

• priv — the NIC private structure. that's it, that's the whole argument list, she's low maintenance 👑

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💜 DESCRIPTION 💜

okay so create_rx_ring is the main character here 🔥 — it creates the rxf and rxd fifos, updates the relevant HW registers, and preallocates skbs for rx. three jobs, zero complaints.

one thing to know: it assumes that Rx is disabled in HW. so like, don't come in here with your Rx still running, bestie, that's not the assignment 🙈

also, the funcs are grouped for better cache usage — yes, it's an aesthetic and a performance thing ✨

now for the tea on the fifos ☕ — RxD fifo is smaller than RxF fifo by design. not a bug, not an accident, it's intentional, periodt. here's why, and this part is important:

upon high load, RxD will be filled and packets will be dropped by the NIC without ever getting into the host or generating interrupts. and in that situation the host has no chance of processing all the packets. 😭

but lowkey? dropping packets by the NIC is cheaper — it takes 0 CPU cycles. zero. none. not a single one. icon behavior honestly 💀

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⭐ RETURN ⭐

• 0 on success 🎉
• a negative value on error 💔

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/net/ethernet/tehuti/tn40.c
• tn40_rx_alloc_buffers(9)
• tn40_tx_map_skb(9)
• tn40_tx_space(9)
• tn40_tx_push_desc(9)
• tn40_tx_push_desc_safe(9)

go read them, they're all part of the friend group 🫶

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and that's the page, bestie!! brought to you by ./drivers/net/ethernet/tehuti 🌸, dated October 2026 ⭐ — no cap, that's the version and the date, mwah 💋🧚‍♀️