ethnl_update_profile(9)

💅 ethnl_update_profile(9) 💅

okay so bestie, welcome to the Kernel API Manual ✨ this one lives in the ethnl corner of the kernel and it's literally all about pulling a profile nest (with its little child nests, so cute) out of userspace. yes, it's giving netlink energy and we're obsessed 🎀

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✨ SYNOPSIS ✨

int ethnl_update_profile (struct net_device *dev , struct dim_cq_moder
__rcu **dst , const struct nlattr *nests , bool *mod , struct
netlink_ext_ack *extack );

like, that's the whole signature, no cap 🫶

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🌸 ARGUMENTS 🌸

• dev — the netdevice to update the profile on. it's the main character here 👑
• dst — the profile that got grabbed from the driver and then modified by ethnl_update_profile. so like, it comes in from the driver, gets a lil glow-up from us 💅
• nests — the nest attr ETHTOOL_A_COALESCE_*X_PROFILE used to set the profile. this is your vibe check for what to apply 🔥
• mod — pointer to a bool for modification tracking. it keeps the receipts on whether anything actually changed ngl 🙈
• extack — Netlink extended ack. classic netlink, always got something to say 😭

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🦋 DESCRIPTION 🦋

okay so the layout of nests is genuinely iconic, let me walk you through it like a little diagram in a group chat ✨

Nested ETHTOOL_A_COALESCE_*X_PROFILE attr, and inside that:

• Nested ETHTOOL_A_PROFILE_IRQ_MODERATION attr
  • ETHTOOL_A_IRQ_MODERATION_USEC attr
  • ETHTOOL_A_IRQ_MODERATION_PKTS attr
  • ETHTOOL_A_IRQ_MODERATION_COMPS attr
  • ...
• Nested ETHTOOL_A_PROFILE_IRQ_MODERATION attr
  • ETHTOOL_A_IRQ_MODERATION_USEC attr
  • ETHTOOL_A_IRQ_MODERATION_PKTS attr
  • ETHTOOL_A_IRQ_MODERATION_COMPS attr

like, it repeats like that — nest inside nest, attrs inside attrs, it's giving russian dolls but make it ethtool 🪆💖 the ... is literally there in the original, so yes bestie, it keeps going in that pattern, iykyk.

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🎀 RETURN 🎀

0 on success, or a negative error code. slay if it's 0, sad girl hours if it's negative 😭

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🌈 SEE ALSO 🌈

• Kernel file ./net/ethtool/coalesce.c
• coalesce_put_profile(9)
• ethnl_update_irq_moder(9)

go read those next, bestie, they're fr fr worth it 🫶

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and that's the whole page, periodt 💜 this one shipped out of ./net/ethtool in October 2026 — mwah, go forth and profile your coalesce 🍓✨