dsa_software_vlan_untag(9)

✨ dsa_software_vlan_untag(9) ✨

okay so bestie, welcome to the manual page for dsa_software_vlan_untag — it lives in the Kernel API Manual and it's lowkey one of those little helpers that keeps the DSA receive path from getting its vibe wrecked 💅

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🎀 NAME 🎀

dsa_software_vlan_untag — Software VLAN untagging in the DSA receive path. that's it, that's the whole name, and it ate 💖

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🌸 SYNOPSIS 🌸

struct sk_buff * dsa_software_vlan_untag (struct sk_buff *skb );

like, it takes an skb and gives you back an skb. main character energy fr fr ✨

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🦋 ARGUMENTS 🦋

• skb — Pointer to socket buffer (packet). that's the packet you're handing over, bestie 🫶

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💜 DESCRIPTION 💜

okay so picture this: this is a receive path method for switches which send some packets as VLAN-tagged towards the CPU port (generally from VLAN-aware bridge ports) even when the packet was not tagged on the wire. iconic behaviour honestly 🙈

it gets called when ds->untag_bridge_pvid (legacy) or ds->untag_vlan_aware_bridge_pvid is set to true. so if either of those is true, this function is the one showing up to the group chat 🔥

side effect alert 🚨 — as a side effect of this method, any VLAN tag from the skb head is moved to hwaccel. not a drill, that's literally what happens, so don't be surprised when your tag's address changes 💀

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🌈 SEE ALSO 🌈

• Kernel file ./net/dsa/tag.h
• dsa_software_untag_vlan_aware_bridge(9)
• dsa_software_untag_vlan_unaware_bridge(9)
• module_dsa_tag_drivers(9)
• module_dsa_tag_driver(9)

go read those too, they're all in the same friend group iykyk 💖

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and that's the page, bestie! this one's from the ./net/dsa source (version vibes: ./net/dsa) and it's dated October 2026 — so yes, we're reading a manpage from the future and it's serving ✨👑 stay hydrated, tag your packets responsibly, periodt 💅🌸