pci_epf_type_add_cfs(9)

💅 pci_epf_type_add_cfs — like, the whole vibe 💅

okay so bestie, welcome to the Kernel API Manual ✨ this one's a little function that helps function drivers show off their very own function-specific attributes in configfs. yes, that's a lot of "function" in one sentence, we're gonna get through it together 🫶

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🌸 NAME 🌸

pci_epf_type_add_cfs — the lil helper that lets function drivers expose their function specific attributes in configfs 💖

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🦋 SYNOPSIS 🦋

struct config_group * pci_epf_type_add_cfs (struct pci_epf *epf , struct config_group *group );

like. look at her. she takes two things and gives you back a struct config_group *. icon behavior 💅

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🎀 ARGUMENTS 🎀

• epf — the EPF device that's gotta get configured using configfs. that's her whole thing, that's what she's here for ✨
• group — the parent configfs group (and yes, it corresponds to the entries in pci_epf_device_id, iykyk 👑)

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⭐ DESCRIPTION ⭐

you invoke this bad girl to expose function specific attributes in configfs. that's literally the job, no cap 🔥

she returns an error pointer if:

• this function gets called for an unbound EPF device 😭 (not bound, not gonna happen, respectfully)
• the EPF driver's add_cfs method straight up fails 💀

so yeah. error pointer = something went sideways. noted. periodt.

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🌈 RETURN 🌈

you get back a pointer to a config_group structure 🎁

or — plot twist — NULL if:

• the function driver doesn't have anything to expose (i.e. attributes configured by user), or
• the function driver doesn't implement the add_cfs method at all 🙈

so NULL here isn't a crash-and-burn situation, it's just "nothing to show, moving on" energy. main character restraint, honestly.

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🔥 SEE ALSO 🔥

• Kernel file ./drivers/pci/endpoint/pci-ep-cfs.c — go read the source, bestie, it's giving lore 📖💜

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and that's the whole page, bestie!! 🍓 sourced from ./drivers/pci/endpoint, dated October 2026 — she's from the future and she's still serving ✨🧚💖