map_txpool_buf_to_ltb(9)

💅 map_txpool_buf_to_ltb — like, the whole manual page, bestie

okay so welcome to the map_txpool_buf_to_ltb(9) page, section 9 of the Kernel API Manual 🌸 this is the ibmvnic corner of the kernel and honestly it's giving niche-but-iconic. sit down, grab a strawberry 🍓, we're mapping buffers to LTBs and it's gonna slay.

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✨ NAME ✨

map_txpool_buf_to_ltb — literally maps a given txpool buffer to an offset in an LTB. that's it. that's the whole vibe. 🦋

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🎀 SYNOPSIS 🎀

void map_txpool_buf_to_ltb (struct ibmvnic_tx_pool *txpool , unsigned
       int bufidx , struct ibmvnic_long_term_buff **ltbp , unsigned int *offset
       );

no cap, that's the signature. void return, four params, copy it exactly or the compiler will come for you 💀

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🌈 ARGUMENTS 🌈

• txpool — the transmit buffer pool that's holding your buffer. it's the home base, the main character, the pool bestie 🫶
• bufidx — the index of the buffer inside txpool. which one? this one. the one at this index ✨
• ltbp — (Output) pointer to the long term buffer (LTB) that contains the buffer. output means this function fills it in for you, you don't set it 💖
• offset — (Output) offset of the buffer in the LTB, measured from ltbp. also an output, also gets filled in, also your problem to receive 👑

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🔥 DESCRIPTION 🔥

so what does it actually do? take the buffer identified by the pair [txpool, bufidx] — that's the tag team, the duo, the it-couple — and map it to an LTB in the pool, plus the corresponding offset for it. that's the whole job. it maps, it does not make the coffee, periodt 💅

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🦋 SEE ALSO 🦋

the kernel file lives at ./drivers/net/ethernet/ibm/ibmvnic.c — go read it, iykyk 📖

and the whole friend group:

• ibmvnic_wait_for_completion(9)
• reuse_ltb(9)
• alloc_long_term_buff(9)
• free_ltb_set(9)
• alloc_ltb_set(9)
• map_rxpool_buf_to_ltb(9)
• release_rx_pools(9)
• reuse_rx_pools(9)
• init_rx_pools(9)
• release_tx_pools(9)
• reuse_tx_pools(9)
• init_tx_pools(9)
• get_hdr_lens(9)
• create_hdr_descs(9)
• build_hdr_descs_arr(9)
• do_passive_init(9)

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ok that's the page 💀 every flag, every param, every reference — all present and accounted for, no cap. go map some buffers, bestie 🌟

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✨ and that's the whole thing ✨ — brought to you by ./drivers/net/ethernet/ibm, dated October 2026, filed under map_txpool_buf_to_ltb(9). mwah 💋🎀