netdev_cap_txqueue(9)

💅 netdev_cap_txqueue(9) — from the Kernel API Manual ✨

okay bestie, welcome to the kernel API manual, this is the page for netdev_cap_txqueue(9) and honestly it's a little baddie with one job. let's get into it 🫶

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🌸 NAME 🌸

netdev_cap_txqueue — check if selected tx queue exceeds device queues 💅

like literally it's the vibe check for your queue index, no cap.

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⭐ SYNOPSIS ⭐

u16 netdev_cap_txqueue (struct net_device *dev , u16 queue_index );

look at her. two arguments. returning a u16. main character energy fr 🔥

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🎀 ARGUMENTS 🎀

• dev — the network device 🖥️ like the actual NIC situation we're looking at.
• queue_index — the given tx queue index 💫 the number somebody handed you and was like "is this valid". we're about to find out.

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💖 DESCRIPTION 💖

okay so here's the whole lore, and it's genuinely so simple:

• if the given tx queue index is >= the number of device tx queues, this function returns 0 💀
• otherwise, it returns the originally passed tx queue index, untouched, unbothered, exactly as it came in 👑

that's it. that's the function. she checks, she clamps, she slays. no cap, no extra steps, no drama. ✨

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🦋 SEE ALSO 🦋

Kernel file ./include/linux/netdevice.h, plus a whole group chat of friends:

• struct gro_node(9)
• napi_is_scheduled(9)
• napi_schedule(9)
• napi_schedule_irqoff(9)
• napi_complete_done(9)
• napi_synchronize(9)
• napi_if_scheduled_mark_missed(9)
• enum netdev_priv_flags(9)
• struct net_device(9)
• netdev_priv(9)
• netdev_from_priv(9)
• netif_napi_add(9)
• netif_napi_add_config(9)
• netif_napi_add_tx(9)
• __netif_napi_del(9)
• netif_napi_del(9)
• netif_start_queue(9)
• netif_wake_queue(9)
• netif_stop_queue(9)
• netif_queue_stopped(9)
• netdev_queue_set_dql_min_limit(9)
• netdev_txq_bql_enqueue_prefetchw(9)
• netdev_txq_bql_complete_prefetchw(9)
• netdev_tx_sent_queue(9)
• netdev_sent_queue(9)
• netdev_tx_completed_queue(9)
• netdev_completed_queue(9)
• netdev_tx_reset_subqueue(9)
• netdev_reset_queue(9)
• netif_running(9)
• netif_start_subqueue(9)
• netif_stop_subqueue(9)
• __netif_subqueue_stopped(9)
• netif_subqueue_stopped(9)
• netif_wake_subqueue(9)
• netif_attr_test_mask(9)
• netif_attr_test_online(9)
• netif_attrmask_next(9)
• netif_attrmask_next_and(9)
• netif_is_multiqueue(9)
• dev_hold(9)
• dev_put(9)
• linkwatch_sync_dev(9)
• netif_carrier_ok(9)
• netif_dormant_on(9)
• netif_dormant_off(9)
• netif_dormant(9)
• netif_testing_on(9)
• netif_testing_off(9)
• netif_testing(9)
• netif_oper_up(9)
• netif_device_present(9)
• netif_tx_lock(9)
• __dev_uc_sync(9)
• __dev_uc_unsync(9)
• __dev_mc_sync(9)
• __dev_mc_unsync(9)

iykyk, that's a whole friend group and they all ate 💅

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and that's the page!! mwah 💋 this one lives in ./include/linux, and it's dated October 2026, and yes the header up top really is netdev_cap_txqueue(9) — so go forth, clamp your queues, and remember: when in doubt, 0. periodt. 🎀🌟👑