get_hdr_lens(9)

💖 get_hdr_lens(9) 💖

okay bestie, welcome to the get_hdr_lens(9) page — this is a Kernel API Manual moment, so grab your iced coffee and let's get into it ✨

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🌸 NAME 🌸

get_hdr_lens — fills list of L2/L3/L4 hdr lens. yes literally that's the whole vibe: it's the header-length list filler-upper 🎀

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🦋 SYNOPSIS 🦋

int get_hdr_lens (u8 hdr_field , struct sk_buff *skb , int *hdr_len );

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💅 ARGUMENTS 💅

• hdr_field — bitfield determining needed headers. it's giving "which headers do we actually want" energy 👑
• skb — socket buffer. the classic. the icon. 🫶
• hdr_len — array of header lengths to be filled. it comes in empty and leaves full, slay 💖

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✨ DESCRIPTION ✨

so what it does: it reads hdr_field to figure out which headers are needed by firmware. then it builds a buffer containing these headers. then — and this is the main character part — it saves the individual header lengths and the total buffer length, to be used to build descriptors. no cap, that's the whole job 🌈

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🔥 RETURN 🔥

total len of all headers. that's the number you get back, periodt 💀✨

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🧚 SEE ALSO 🧚

Kernel file ./drivers/net/ethernet/ibm/ibmvnic.c

and the whole friend group, fr fr:

• 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)
• map_txpool_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)
• create_hdr_descs(9)
• build_hdr_descs_arr(9)
• do_passive_init(9)

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mwah 💜 that's the page!! sourced from ./drivers/net/ethernet/ibm, dated October 2026 — go forth and fill those header lens bestie, iykyk 🎀💖✨