ethnl_put_strz(9)

💅 ethnl_put_strz(9) — the Kernel API Manual

ok so bestie, we're in the Kernel API Manual today and this little function is genuinely iconic. it's ethnl_put_strz and it's giving "i put a string in a message" energy. yes it's a whole vibe. no cap.

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✨ SYNOPSIS ✨

int ethnl_put_strz (struct sk_buff *skb , u16 attrtype , const char *s );

that's it. three args, one int coming back. slay.

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🎀 ARGUMENTS 🎀

• skb — the skb that's holding the message 👑 this is the whole context, ok, don't lose it.
• attrtype — the attribute type. literally just which attribute we're talking about 🏷️
• s — a string that's ETH_GSTRING_LEN sized. and bestie, heads up: it may not be null terminated 😭 read that again. it's not guaranteed to have that little \0 at the end.

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🦋 DESCRIPTION 🦋

it puts an attribute into the message — one with a null terminated string made from s. so like, the attribute you get out there is null terminated, even if s wasn't. that's the glow-up fr fr ✨

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🔥 RETURN 🔥

• 0 on success — we ate 💅
• a negative error code on failure — something went wrong, cry about it 😭

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🌸 friendly reminder: s is ETH_GSTRING_LEN sized and may not be null terminated, so don't go assuming things about it. that's the whole point of this function existing, iykyk.

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🌈 SEE ALSO 🌈

Kernel file ./net/ethtool/netlink.h plus the whole friend group:

• ethnl_strz_size(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)
• 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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ok that's the whole page, ily, go write some netlink attributes 💖

this masterpiece lives in ./net/ethtool, dated October 2026, and it's part of the Kernel API Manual — see u next time bestie 🫶🎀