netif_uc_promisc_update(9)

💅 netif_uc_promisc_update(9) 💅

okay so this is a page from the Kernel API Manual — yes, the kernel API manual, we're doing big-brain main character energy today — and it's all about netif_uc_promisc_update. Let's get into it bestie 🫶

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✨ NAME ✨

netif_uc_promisc_update — literally just evaluates whether uc_promisc should be toggled. that's the whole vibe check. 🦋

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🌸 SYNOPSIS 🌸

int netif_uc_promisc_update (struct net_device *dev );

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🎀 ARGUMENTS 🎀

• dev — the device 💖 (that's it, that's the argument, she's simple, she's iconic)

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💅 DESCRIPTION 💅

okay so important thing first, no cap: this must be called under netif_addr_lock_bh. like, not optional, not "whatever", that's the rule. 🙈

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⭐ RETURN ⭐

the numbers speak for themselves, bestie:

• +1 → enter promisc 👑
• -1 → leave promisc 🚪
• 0 → no change, we're chilling 😌

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🌈 SEE ALSO 🌈

so this is the part where we list literally everyone in the group chat. the kernel file lives at ./net/core/dev_addr_lists.c and these are all the besties:

• __hw_addr_sync_dev(9)
• __hw_addr_ref_sync_dev(9)
• __hw_addr_ref_unsync_dev(9)
• __hw_addr_unsync_dev(9)
• __hw_addr_list_snapshot(9)
• __hw_addr_list_reconcile(9)
• dev_addr_flush(9)
• dev_addr_init(9)
• dev_addr_add(9)
• dev_addr_del(9)
• dev_uc_add_excl(9)
• dev_uc_add(9)
• dev_uc_del(9)
• dev_uc_sync(9)
• dev_uc_sync_multiple(9)
• dev_uc_unsync(9)
• dev_uc_flush(9)
• dev_uc_init(9)
• dev_mc_add_excl(9)
• dev_mc_add(9)
• dev_mc_add_global(9)
• dev_mc_del(9)
• dev_mc_del_global(9)
• dev_mc_sync(9)
• dev_mc_sync_multiple(9)
• dev_mc_unsync(9)
• dev_mc_flush(9)
• dev_mc_init(9)
• __dev_set_rx_mode(9)
• netif_rx_mode_sync(9)

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lowkey the whole dev_uc_* AND dev_mc_* families are here, so if you were looking for a family reunion, this is it. ate. 💀✨

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and that's the page!! 🧚 this cutie lives in ./net/core, dated October 2026, and it's netif_uc_promisc_update(9) all the way down. periodt. 💜🍓