qman_affine_channel(9)

👑 qman_affine_channel — the kernel API manual, bestie edition

okay so you're in the qman_affine_channel(9) page of the Kernel API Manual and honestly? it's a tiny one, but it's iconic. let's get into it 💅

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✨ NAME ✨

qman_affine_channel — returns the channel ID of a portal 🎀

(and yes bestie, the original really does say "an portal". we don't fix it, we just notice it. lowkey charming.)

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🦋 SYNOPSIS 🦋

u16 qman_affine_channel (int cpu );

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🌸 ARGUMENTS 🌸

• cpu — the cpu whose affine portal is the subject of the query ✨

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💖 DESCRIPTION 💖

here's the tea 🍓 — if cpu is -1, then the affine portal for the current CPU gets used. slay, convenient.

⚠️ but listen: it is a bug to call this function for any value of cpu (other than -1) that is not a member of the mask returned from qman_affine_cpus. not "kinda sketchy", not "vibes off" — an actual bug. fr fr. so do your vibe check against that mask first, or you're gonna have a bad time 😭

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🔥 SEE ALSO 🔥

and now, the main character energy section. the kernel file to look at is ./include/soc/fsl/qman.h, and here is the whole squad 🫶:

• qman_p_irqsource_add(9)
• qman_p_irqsource_remove(9)
• qman_affine_cpus(9)
• qman_get_affine_portal(9)
• qman_start_using_portal(9)
• qman_p_poll_dqrr(9)
• qman_p_static_dequeue_add(9)
• qman_create_fq(9)
• qman_destroy_fq(9)
• qman_fq_fqid(9)
• qman_init_fq(9)
• qman_schedule_fq(9)
• qman_retire_fq(9)
• qman_oos_fq(9)
• qman_enqueue(9)
• qman_alloc_fqid_range(9)
• qman_release_fqid(9)
• qman_query_fq_np(9)
• qman_alloc_pool_range(9)
• qman_release_pool(9)
• qman_create_cgr(9)
• qman_delete_cgr(9)
• qman_delete_cgr_safe(9)
• qman_update_cgr_safe(9)
• qman_query_cgr_congested(9)
• qman_alloc_cgrid_range(9)
• qman_release_cgrid(9)
• qman_is_probed(9)
• qman_portals_probed(9)
• qman_dqrr_get_ithresh(9)
• qman_dqrr_set_ithresh(9)

every single one, no skips, we ate that list 💀✨

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🌈 closing vibes 🌈

this slay little page comes from ./include/soc/fsl and it's dated October 2026 — so go forth, query your affine portals responsibly, and remember: -1 is your bestie, everything else needs to be in that mask. periodt 💜🎀

byeee, ily, go read qman_affine_cpus(9) next 🧚