eth_header_cache(9)

💅 eth_header_cache(9) 💅

okay so bestie, welcome to the Kernel API Manual — this is the page for eth_header_cache(9), and it's literally the moment a neighbour hands over the receipts so we can build a header template. no cap, it's a tiny function but it's iconic in its own way 🎀

---

✨ NAME ✨

eth_header_cache — fill that cache entry from the neighbour, periodt

---

🦋 SYNOPSIS 🦋

int eth_header_cache (const struct neighbour *neigh , struct hh_cache
*hh , __be16 type );

---

🌸 ARGUMENTS 🌸

• neigh — the source neighbour 🫶 this is where the info is coming from
• hh — the destination cache entry 💖 this is the glow-up target we're filling in
• type — the Ethernet type field, fr fr

---

⭐ DESCRIPTION ⭐

So what does it actually do? It creates an Ethernet header template from the neighbour. that's the whole vibe 🧚✨ like, the neighbour's details get turned into a header template and everybody moves on. simple, clean, slay.

---

🔥 SEE ALSO 🔥

Kernel file ./net/ethernet/eth.c — and bestie, the whole friend group is here:

• eth_header(9)
• eth_get_headlen(9)
• eth_type_trans(9)
• eth_header_cache_update(9)
• eth_header_parse_protocol(9)
• eth_prepare_mac_addr_change(9)
• eth_commit_mac_addr_change(9)
• eth_mac_addr(9)
• ether_setup(9)
• alloc_etherdev_mqs(9)
• platform_get_ethdev_address(9)
• nvmem_get_mac_address(9)
• fwnode_get_mac_address(9)
• device_get_mac_address(9)
• device_get_ethdev_address(9)

---

💜 that's the whole page, no filler. go read the others if you want the full lore, iykyk.

---

mwah 💋 this has been your girl signing off — brought to you by ./net/ethernet, dated October 2026, and this was eth_header_cache(9) all along 👑✨