nfp_cpp_map_area(9)

✨ nfp_cpp_map_area — a kernel API manual moment 💅

okay so bestie, welcome to nfp_cpp_map_area(9) from the Kernel API Manual — yes that's the manual name, and yes it's a whole vibe. this one's a helper function, and it's about to map an area for you. buckle up 🎀

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🌸 NAME 🌸

nfp_cpp_map_area — it's literally the helper function whose entire personality is mapping an area. that's it. that's the job. iconic. ✨

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🦋 SYNOPSIS 🦋

u8 __iomem * nfp_cpp_map_area (struct nfp_cpp *cpp , const char *name ,
u32 cpp_id , u64 addr , unsigned long size , struct nfp_cpp_area **area
);

look at her. six whole arguments. main character energy fr fr 👑

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💖 ARGUMENTS 💖

• cpp — the NFP CPP handler. your ride-or-die struct pointer.
• name — a name for the area, because everything deserves to be named 🥺
• cpp_id — the CPP ID for the operation
• addr — the CPP address
• size — how big the area is (the size of the area, no cap)
• area — the area handle, and heads up: this one is an output 💫

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🌈 DESCRIPTION 🌈

so what does she actually do? she maps an area of IOMEM access. that's the whole thing. lowkey simple, highkey useful.

but here's the part you cannot skip, bestie — if you ever want to undo the effect of this function call, you call:

nfp_cpp_area_release_free(*area)

like, you gotta release and free it. don't just leave it hanging there, that's not the vibe 💀

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⭐ RETURN ⭐

she returns a pointer to memory mapped area — or ERR_PTR 😭 so like, check it. always check it. ERR_PTR is the "not me, not today" of return values.

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🔥 SEE ALSO 🔥

• the Kernel file ./drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cpplib.c 👀
• nfp_cpp_readl(9)
• nfp_cpp_writel(9)
• nfp_cpp_readq(9)
• nfp_cpp_writeq(9)

go read those next, iykyk 🫶

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and that's the whole page, bestie — brought to you by the source ./drivers/net/ethernet/netrono... and dated October 2026, signed off in full nfp_cpp_map_area(9) fashion. slay, stay mapped, and remember to free your areas 💜🧚🌸