ocelot_xmit_get_vlan_info(9)

💅 ocelot_xmit_get_vlan_info 💅

okay bestie so we're in the Kernel API Manual today and the page we're reading is ocelot_xmit_get_vlan_info(9) — yes that whole mouthful, iykyk 🦋

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✨ NAME ✨

ocelot_xmit_get_vlan_info — the lil helper that figures out the VLAN_TCI and the TAG_TYPE for a frame that's getting injected 👑

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🌸 SYNOPSIS 🌸

void ocelot_xmit_get_vlan_info (struct sk_buff *skb , struct net_device
*br , u64 *vlan_tci , u64 *tag_type );

literally that's it, that's the whole signature, no cap 💀

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🎀 ARGUMENTS 🎀

• skb — pointer to the socket buffer, the packet itself, the main character of this whole situation 📦
• br — pointer to the bridge device that the port is under, if any (keyword: if any, sometimes it's just vibing with no bridge at all) 🌉
• vlan_tci — ngl bestie the manpage gives zero description here, it just sits there looking pretty 🙈
• tag_type — same situation, no blurb, we move ✨

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🦋 DESCRIPTION 🦋

okay so here's the tea ☕

If the port is under a VLAN-aware bridge, we remove the VLAN header from the payload and move it into the DSA tag — and the way that works is it makes the switch classify the packet to the bridge VLAN. slay, correct behavior, no notes 💅

Otherwise? We leave the classified VLAN at zero. And zero is the pvid of standalone ports (OCELOT_STANDALONE_PVID) — but not of VLAN-unaware bridge ports, because those would be ocelot_vlan_unaware_pvid. different girl, different pvid, don't mix them up 🫶

Anyway, VID 0 is fine, and here's why, two reasons, both iconic:

1. it is stripped on egress for these port modes 🧚
2. source address learning is not performed for packets injected from the CPU anyway

so yeah, it doesn't matter that the VID is "wrong" — those quote marks are doing so much work, and honestly? it ate. 🔥

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⭐ SEE ALSO ⭐

• Kernel file ./include/linux/dsa/ocelot.h — go read it, it's giving source of truth 📖

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🫶 friendly reminder bestie: this page lives at ./include/linux/dsa and it's dated October 2026 — so yes, from the future, and it's still iconic. periodt 💜🎀