cdnsp_find_next_ext_cap(9)

🎀 cdnsp_find_next_ext_cap(9) 🎀

okay so bestie, this is a page from the Kernel API Manual and honestly it's giving "small function, big main character energy" — it's literally called cdnsp_find_next_ext_cap and it's about finding extended capabilities. stay with me, it slays 🔥

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✨ NAME ✨

cdnsp_find_next_ext_cap — find the offset of the extended capabilities with capability ID id. that's it, that's the whole vibe 💅

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🌸 SYNOPSIS 🌸

int cdnsp_find_next_ext_cap (void __iomem *base , u32 start , int id );

look at her go 🫶

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🦋 ARGUMENTS 🦋

• base — the PCI MMIO registers base address. this is your starting address, the foundation of the whole operation, the moment before everything else happens ✨
• start — the address at which to start looking, and yes it's (0 or HCC_PARAMS to start at beginning of list) — so if you wanna start from the very top of the list, that's your move, iykyk 👑
• id — the extended capability ID to search for. this is the thing you're hunting for, the whole reason you're here fr fr 🔍

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💖 DESCRIPTION 💖

so what does she actually do? she returns the offset of the next matching extended capability structure. that's the whole thing. no cap ✨

and here's the part that's lowkey iconic: some capabilities can occur several times, e.g., the EXT_CAPS_PROTOCOL, and this provides a way to find them all. so instead of just grabbing the first one and calling it a day, you can keep calling this and collect the whole set like little pokémon 💅 literally obsessed with the reusability of it all 🌈

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🔥 SEE ALSO 🔥

• Kernel file ./drivers/usb/cdns3/cdnsp-gadget.c cdnsp_gadget_init(9) — go read the neighbors, they're part of the friend group too 🫶

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and that's the page bestie!! it comes to you from ./drivers/usb/cdns3, dated October 2026 — so mark your calendar, screenshot this, send it to the group chat, and remember: the extended capabilities were inside you all along 💜🧚✨