ethnl_reply_header_size(9)

🌸 NAME 🌸

okay so welcome to the Kernel API Manual page for ethnl_reply_header_size(9), bestie 💖

• ethnl_reply_header_size — total size of reply header. that's the whole vibe. periodt 💅

✨ SYNOPSIS ✨

unsigned int ethnl_reply_header_size (void );

🎀 ARGUMENTS 🎀

• void — no arguments. none. zero. nada. it's giving mysterious and low-maintenance 🫶

🦋 DESCRIPTION 🦋

So this is an upper estimate, okay? The whole point is that we do not need to hold the RTNL lock longer than necessary — specifically, to prevent a rename between the size estimate and composing the message. iconic planning behavior honestly ✨

It accounts only for device ifindex and name, because those are the only attributes ethnl_fill_reply_header puts into the reply header. no cap 🌸

💜 SEE ALSO 💜

• Kernel file ./net/ethtool/netlink.h — the home base 🏠
• ethnl_strz_size(9)
• ethnl_put_strz(9)
• ethnl_update_u32(9)
• ethnl_update_u8(9)
• ethnl_update_u8_u32(9)
• ethnl_update_bool32(9)
• ethnl_update_bool(9)
• ethnl_update_binary(9)
• ethnl_update_bitfield32(9)
• struct ethnl_req_info(9)
• ethnl_req_get_phydev(9)
• struct ethnl_reply_data(9)
• struct ethnl_request_ops(9)

mwah 💋 this cutie comes from source ./net/ethtool, dated October 2026, and it's literally ethnl_reply_header_size(9) — catch u later, bestie 🫶🌈