ethtool_rxfh...s_can_resize(9)

💅 ethtool_rxfh_ctxs_can_resize — a Kernel API Manual moment

okay so bestie, welcome to the ethtool_rxfh...s_can_resize(9) page, from the Kernel API Manual ✨ this one's short and sweet and honestly kind of a vibe.

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🌸 NAME 🌸

ethtool_rxfh_ctxs_can_resize — the little function that does a vibe check on resizing, like, all the RSS contexts at once 🎀

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✨ SYNOPSIS ✨

int ethtool_rxfh_ctxs_can_resize (struct net_device *dev , u32
       new_indir_size );

that's it. that's the whole signature. she's compact 👑

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🦋 ARGUMENTS 🦋

• dev — the network device 💻 like, the actual NIC we're talking about here
• new_indir_size — the new indirection table size, aka the size you're dreaming of upgrading to ✨

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💖 DESCRIPTION 💖

okay so here's the tea. this function validates that the indirection tables of all non-default RSS contexts can be resized to new_indir_size. all of them. not just the main character one — every single non-default context has to pass the vibe check 🌈

and the best part? she's read-only. she does not modify any context. not one. zero changes. purely a "can we tho?" situation, no cap 🙈

she's intended to be paired with ethtool_rxfh_ctxs_resize — so like, this one asks the question, and that one actually does the thing. they're a duo, iykyk 🫶

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🔥 RETURN 🔥

• 0 if all contexts can be resized — slay, we're so back 💅
• negative errno on failure — something said no, and honestly? rude 😭

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👑 SEE ALSO 👑

• Kernel file ./net/ethtool/common.c
• ethtool_forced_speed_maps_init(9)
• ethtool_rxfh_indir_lost(9)
• ethtool_rxfh_indir_can_resize(9)
• ethtool_rxfh_indir_resize(9)
• ethtool_rxfh_ctxs_resize(9)

go read the whole friend group, they're all icons fr fr 🌟

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and that's the page!! brought to you by ./net/ethtool, dated October 2026 — mwah, love u, go resize something responsibly 🧚💜