qeth_l2_dev2br_fdb_notify(9)

💅 qeth_l2_dev2br_fdb_notify(9) — the Kernel API Manual, bestie edition 🎀

okay so this is a page from the Kernel API Manual and it's all about qeth_l2_dev2br_fdb_notify, and honestly? it's giving "tiny function, big responsibilities" energy. no cap.

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✨ NAME ✨

qeth_l2_dev2br_fdb_notify — update fdb of master bridge 🫶

like, it literally just updates the fdb of the master bridge. that's the whole vibe. iykyk.

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🌸 SYNOPSIS 🌸

void qeth_l2_dev2br_fdb_notify (struct qeth_card *card , u8 code ,
       struct net_if_token *token , struct mac_addr_lnid *addr_lnid );

returns void, so like… it doesn't hand you a result back, it just does the thing and moves on. main character energy fr. 👑

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🦋 ARGUMENTS 🦋

okay bestie here's the whole cast of characters, and every single one of them matters:

• card — a qeth_card structure pointer 💳 — that's your entry point, the whole reason we're here.
• code — the event bitmask, and this one has layers, so pay attention:
  • the high order bit 0x80 is set to 1 for removal of an object, or 0 for addition of an object ✨
  • and then there's the object type(s): 0x01 is VLAN, 0x02 is MAC, and 0x03 is VLAN and MAC 🌈 (yes, 0x03 is the both-at-once combo, she's versatile)
• token — the "network token" structure that identifies the 'physical' location of the target 📍 — note the quotes around 'physical', that's the original's typography not mine, okay?
• addr_lnid — a structure holding the MAC address and VLAN ID of the target 💖

lowkey the code argument is the one to triple-check, because bitmask math at 2am is a choice. 🫠

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⭐ SEE ALSO ⭐

the whole friend group, in the order the page gives them, because besties don't get reordered 💅:

• the Kernel file ./drivers/s390/net/qeth_l2_main.c
• qeth_l2_pnso(9)
• qeth_l2_dev2br_an_set(9)
• qeth_l2_br2dev_worker(9)
• qeth_l2_bridge_setlink(9)
• qeth_l2_detect_dev2br_support(9)
• qeth_bridge_emit_host_event(9)
• qeth_bridgeport_query_support(9)
• qeth_bridgeport_query_ports(9)
• qeth_bridgeport_setrole(9)
• qeth_bridgeport_an_set(9)
• qeth_bridgeport_allowed(9)

that's twelve references, no filler, all iconic. 🔥

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and yeah, that's the whole page! 🎀 it lives in ./drivers/s390/net and it's dated October 2026 — write that down, bestie, it's on the test. mwah, go slay some bridge fdb updates 💜🧚‍♀️