netif_attr_test_mask(9)

💅 netif_attr_test_mask — from the Kernel API Manual, bestie

Okay so welcome to netif_attr_test_mask(9), straight out of the Kernel API Manual. It's the little helper function that answers one very specific question for you: is this CPU or Rx queue actually in the mask? And honestly? It ate. ✨

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🌸 NAME 🌸

netif_attr_test_mask — test a CPU or Rx queue set in a mask 🎀

Like, think of it as the vibe check for your bitmask: is index j in there or not?

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🦋 SYNOPSIS 🦋

bool netif_attr_test_mask (unsigned long j , const unsigned long *mask ,
       unsigned int nr_bits );

No cap, that's the whole signature. bool in, bool out, very demure, very mindful. 💖

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🎀 ARGUMENTS 🎀

Okay bestie, here's who's invited to the function:

• j — the CPU/Rx queue index 👑 this is the one we're checking for, the main character of the operation
• mask — bitmask of all cpus/rx queues 🌈 the whole guest list
• nr_bits — number of bits in the bitmask ⭐ so we know how big the guest list actually is

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✨ DESCRIPTION ✨

So here's the tea: this function tests whether a CPU or Rx queue index is actually set in a mask of all CPU/Rx queues. That's it. That's the whole job. 🫶

One index, one mask, one answer. It's giving "simple, iconic, does exactly what it says on the tin." 💅

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🔥 SEE ALSO 🔥

Right, so this part is a lot, and I mean a lot a lot — like the entire netdevice extended-universe cast list. Every single one of these is here, no skipping, we don't do that 🙈

• Kernel file ./include/linux/netdevice.h 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)
• netdev_cap_txqueue(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_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)

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iykyk, netif_attr_test_online(9) is literally right above in that list and they're besties, so go read that one next if you're in a mask-testing mood 🧚

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💜 the cute sign-off 💜

This page lives under ./include/linux, dated October 2026, and it's brought to you by the netif_attr_test_mask(9) girlies 💅✨ Go test a mask, bestie, you got this, periodt. 🍓