bpf_struct_o...or_each_prog(9)

💅 bpf_struct_ops_for_each_prog(9)

okay bestie, welcome to the Kernel API Manual ✨ — yes this is a real function name, no I did not make it up, and yes it is lowkey a mouthful. we're doing bpf_struct_ops_for_each_prog today and honestly? it's giving little-helper-that-could 🫶

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🌸 NAME 🌸

bpf_struct_ops_for_each_prog — invoke @cb for each member prog 💫

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✨ SYNOPSIS ✨

int bpf_struct_ops_for_each_prog (const void *kdata , int (*cb)(struct
       bpf_prog *prog, void *data) , void *data );

she's long, she's got a function pointer in the middle, she's iconic. type it carefully bestie 💅

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🎀 ARGUMENTS 🎀

• kdata — the kernel-side struct_ops vmtable. iykyk — this is the same kdata arg you hand to ->reg / ->update / ->unreg. your entry pass 🎟️
• cb — the callback, invoked once per member prog. super important: a non-zero return from this bad boy stops the iteration. not me ending the whole loop early 😭
• data — opaque argument, just gets passed straight through to cb. she's a vibe carrier, no questions asked 🔥

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🦋 DESCRIPTION 🦋

so what does she do? she walks the struct_ops member progs that are registered on the map containing kdata — like a little tour guide for your progs 🧚

this is intended for use from struct_ops ->reg callbacks (and similar) that need to inspect the loaded BPF programs. and fr fr, the classic example: discovering the maps they reference via prog->aux->used_maps 👑

Return 0 if iteration completed, otherwise the first non-zero cb return. periodt. 💜

ngl, remember that early-exit rule — the moment your cb returns non-zero, the loop is done, and that value is what comes back out. main character exit energy 💀

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🌈 SEE ALSO 🌈

• Kernel file ./kernel/bpf/bpf_struct_ops.c — go read the source bestie, she's right there 📖

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and that's the whole page! 💖 brought to you by the fine folks over at ./kernel/bpf, dated October 2026 — mwah, slay, go write some struct_ops 🫶🌸✨