netdev_uppe...next_dev_rcu(9)

netdev_upper_get_next_dev_rcu(9) 💅✨

Okay bestie, so this is a page from the Kernel API Manual — yes, the Kernel API Manual, the big one — and we're talking about netdev_upper_get_next_dev_rcu. Buckle in, it's short but it's important, and it's giving "tiny function, huge responsibilities" energy. 🎀

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🌸 NAME 🌸

netdev_upper_get_next_dev_rcu — get the next dev from the upper list. That's it. That's the whole vibe. 🦋

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✨ SYNOPSIS ✨

struct net_device * netdev_upper_get_next_dev_rcu (struct net_device
*dev , struct list_head **iter );

Literally copy that exactly, don't get creative with it, she's sensitive about her signature. 😭

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💖 ARGUMENTS 💖

• dev — the device. Your main character device, the one we're poking around in. 👑
• iter — a list_head ** pointing at your current position. Think of it as the little bookmark showing where you're at in the list. 🔖

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🧚 DESCRIPTION 🧚

So here's the tea: this function gets you the next device from dev's upper list, starting from wherever your iter position is currently sitting. It's a "walk the list one step at a time" situation, no cap. 🚶‍♀️

⚠️ But listen — and I mean listen — the caller must hold the RCU read lock. Not optional. Not "if you feel like it". It's a must. Go hold that lock before you call this, or the vibes will be catastrophic. 💀

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🔥 SEE ALSO 🔥

Bestie. The list of friends on this page is immense. She knows everyone. Kernel file ./net/core/dev.c is where the family lives, and here's the whole group chat — every single one, no skipping: 🫶

dev_add_pack(9), __dev_remove_pack(9), dev_remove_pack(9), dev_get_iflink(9), dev_fill_metadata_dst(9), netdev_napi_by_id_lock(9), __dev_get_by_name(9), dev_get_by_name_rcu(9), netdev_get_by_name(9), __dev_get_by_index(9), dev_get_by_index_rcu(9), netdev_get_by_index(9), dev_get_by_napi_id(9), netdev_get_by_index_lock(9), netdev_get_name(9), dev_getbyhwaddr_rcu(9), dev_getbyhwaddr(9), netdev_get_by_flags_rcu(9), dev_valid_name(9), __dev_alloc_name(9), dev_alloc_name(9), dev_get_alias(9), netdev_features_change(9), __netdev_notify_peers(9), netdev_notify_peers(9), dev_disable_gro_hw(9)

register_netdevice_notifier(9), unregister_netdevice_notifier(9), register_netdevice_notifier_net(9), unregister_netdevice_notifier_net(9), call_netdevice_notifiers_info(9), call_netdevice_notifiers_info_robust(9), call_netdevice_notifiers(9), call_netdevice_notifiers_mtu(9), dev_forward_skb(9), dev_nit_active_rcu(9), netif_setup_tc(9), netif_set_real_num_rx_queues(9), netif_set_real_num_queues(9), netif_set_tso_max_size(9), netif_set_tso_max_segs(9), netif_inherit_tso_max(9), netif_get_num_default_rss_queues(9), netif_device_detach(9), netif_device_attach(9), dev_loopback_xmit(9), __dev_queue_xmit(9), rps_flow_is_active(9), rps_may_expire_flow(9), __netif_rx(9), netif_rx(9), netdev_is_rx_handler_busy(9), netdev_rx_handler_register(9), netdev_rx_handler_unregister(9), netif_receive_skb_core(9), netif_receive_skb(9), netif_receive_skb_list(9), __napi_schedule(9), napi_schedule_prep(9), __napi_schedule_irqoff(9), netif_threaded_enable(9), netif_queue_set_napi(9), napi_disable(9), napi_enable(9)

netdev_has_upper_dev(9), netdev_has_upper_dev_all_rcu(9), netdev_has_any_upper_dev(9), netdev_master_upper_dev_get(9), netdev_has_any_lower_dev(9), netdev_lower_get_next_private(9), netdev_lower_get_next_private_rcu(9), netdev_lower_get_next(9), netdev_lower_get_first_private_rcu(9), netdev_master_upper_dev_get_rcu(9), netdev_upper_dev_link(9), netdev_master_upper_dev_link(9), netdev_upper_dev_unlink(9), netdev_bonding_info_change(9), netdev_get_xmit_slave(9), netdev_sk_get_lowest_dev(9), netdev_lower_state_changed(9), netif_get_flags(9), netif_set_mtu_ext(9), netif_pre_changeaddr_notify(9), dev_get_phys_port_id(9), dev_get_phys_port_name(9), netif_get_port_parent_id(9), netdev_port_same_parent_id(9), netdev_change_proto_down_reason_locked(9), dev_change_xdp_fd(9), dev_index_reserve(9), netdev_update_features(9), netdev_change_features(9), netif_stacked_transfer_operstate(9), register_netdevice(9), register_netdev(9), netdev_wait_allrefs_any(9), dev_get_stats(9), dev_fetch_sw_netstats(9), dev_get_tstats64(9), netdev_sw_irq_coalesce_default_on(9), alloc_netdev_mqs(9), free_netdev(9), alloc_netdev_dummy(9), synchronize_net(9), unregister_netdevice_queue(9), unregister_netdevice_many(9), unregister_netdev(9), netdev_increment_features(9), netdev_compute_master_upper_features(9), netdev_drivername(9)

Like I said. Everyone. 💅

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And that's the whole page, bestie — sourced from ./net/core, dated October 2026, and honestly? She ate. Periodt. 🍓✨👑