dev_get_by_napi_id(9)

💖 dev_get_by_napi_id(9) 💖

okay bestie, welcome to the Kernel API Manual page for dev_get_by_napi_id — yes it's a mouthful, yes it's iconic, and yes we're gonna get through it together. grab a strawberry drink 🍓 and let's go.

---

✨ NAME ✨

dev_get_by_napi_id — find a device by napi_id. that's it. that's the whole vibe. you give it a NAPI ID, it goes hunting for the device. 🔍

---

🦋 SYNOPSIS 🦋

struct net_device * dev_get_by_napi_id (unsigned int napi_id );

like… literally just call it with a napi_id and it hands you back a struct net_device *. no cap. 🫶

---

🎀 ARGUMENTS 🎀

• napi_id — the ID of the NAPI struct. that's the number you're searching by, bestie. it's an unsigned int, it's the whole personality of this call, don't overthink it 💅

---

🔥 DESCRIPTION 🔥

so the way this works: it searches for an interface by NAPI ID. that's the mission, that's the moment, main character energy fr. ✨

what you get back?

• NULL if the device is not found — sad girl hours, it happens 😭
• or a pointer to the device — slay, found her 👑

⚠️ okay this part matters, listen up: the device has not had its reference counter increased, so the caller must be careful about locking. and the caller must hold RCU lock. this is not a drill, this is not a suggestion — hold the RCU lock or the vibe check will end you 💀

---

🌈 SEE ALSO 🌈

the kernel file is ./net/core/dev.c and honestly it has so many friends. here's the whole group chat, in order, nobody gets left on read:

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), 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_upper_get_next_dev_rcu(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)

---

and that's the page, bestie 🧚 you ate that. this lil gem comes from the source dir ./net/core, dated October 2026, and it's filed under dev_get_by_napi_id(9) — periodt. 💅👑