ethnl_update_u8(9)

💅 ethnl_update_u8 💅

okay bestie, welcome to ethnl_update_u8(9) from the Kernel API Manual — yes, we’re in kernel API land and it’s lowkey iconic ✨

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✨ NAME ✨

ethnl_update_u8 — update u8 value from NLA_U8 attribute 🦋

🌸 SYNOPSIS 🌸

void ethnl_update_u8 (u8 *dst , const struct nlattr *attr , bool *mod );

that’s the whole signature, bestie — it’s void, so no return value to catch 💅

🎀 ARGUMENTS 🎀

• dst — value to update 💖 this is the destination variable, bestie
• attr — netlink attribute with new value or null 🎀
• mod — pointer to bool for modification tracking ✨

🔥 DESCRIPTION 🔥

Okay so here’s the actual vibe: this function copies the u8 value from the NLA_U8 netlink attribute attr into the variable pointed to by dst 🫶 and if attr is null, it does absolutely nothing — no cap, just a polite little no-op 🙈

The bool pointed to by mod is set to true if this function changed the value of *dst 🔥 otherwise it is left as is — not flipped, not reset, just left exactly where it was 💅

bestie note: attr being null is the “do nothing” branch, and mod only flips to true when the value actually changes. Otherwise mod stays however it was. periodt ✨

🌈 SEE ALSO 🌈

Kernel file ./net/ethtool/netlink.h — go read, iykyk 👑

• ethnl_strz_size(9)
• ethnl_put_strz(9)
• ethnl_update_u32(9)
• ethnl_update_u8_u32(9)
• ethnl_update_bool32(9)
• ethnl_update_bool(9)
• ethnl_update_binary(9)
• ethnl_update_bitfield32(9)
• ethnl_reply_header_size(9)
• struct ethnl_req_info(9)
• ethnl_req_get_phydev(9)
• struct ethnl_reply_data(9)
• struct ethnl_request_ops(9)

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xoxo, from ./net/ethtool 💖 dated October 2026 🎀 and yes, the page is ethnl_update_u8(9) — slay 🌟