tn40_rx_alloc_buffers(9)

💖 tn40_rx_alloc_buffers(9) 💖

okay so bestie, welcome to the Kernel API Manual — this one's a driver-level girlypop from the kernel side of town, and honestly? she's doing a lot. let's get into it ✨

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🌸 NAME 🌸

tn40_rx_alloc_buffers — fill the rxf fifo with buffers, periodt.

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✨ SYNOPSIS ✨

void tn40_rx_alloc_buffers (struct tn40_priv *priv );

like… that's the whole signature. no return value, no drama, she just does it 💅

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🎀 ARGUMENTS 🎀

• priv — the NIC's private structure. that's her little suitcase of state, everything she needs to know about the hardware lives in there 🫶

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🦋 DESCRIPTION 🦋

so what she does is: rx_alloc_buffers allocates buffers via the page pool API, builds rxf descs, and then pushes them (the rxf descr, yes) into the rxf fifo. iconic behavior, no cap.

the pages get stored in rxdb. that's their home now 🏡

and when she needs to calculate the free space? she uses the cached values of RPTR and WPTR. lowkey efficient of her, honestly.

also important: this function updates RPTR and WPTR. so she's not just reading the vibes, she's changing them. main character energy fr fr 🔥

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🔍 SEE ALSO 🔍

• the kernel file ./drivers/net/ethernet/tehuti/tn40.c
• tn40_create_rx_ring(9)
• tn40_tx_map_skb(9)
• tn40_tx_space(9)
• tn40_tx_push_desc(9)
• tn40_tx_push_desc_safe(9)

like a little friend group of functions, all in the same directory ./drivers/net/ethernet/tehuti — go say hi to the rest of the squad 💜

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ngl bestie, if you're poking at tn40.c, read the friends above too — that's the whole rxf/txf pipeline vibe check 🧚

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and that's the page!! brought to you by the Kernel API Manual, living in ./drivers/net/ethernet/tehuti, stamped October 2026 ⭐ mwah, go write some buffers 💖