lt_calculate_size(9)

🎀 NAME 🎀

okay so bestie, this is lt_calculate_size(9) from the Kernel API Manual, and it is literally the helper for Get storage size for lookup table with overflow check 💅✨. The way that it calculates storage size and also checks for overflow? iconic. periodt.

✨ SYNOPSIS ✨

ssize_t lt_calculate_size (unsigned int groups , unsigned int bb ,
       unsigned int bsize );

🦋 ARGUMENTS 🦋

• groups — the amount of bit groups 🌸
• bb — the number of bits grouped together in lookup table buckets 🍓
• bsize — the size of each bucket in lookup table, in longs 💖

💅 RETURN 💅

It gives you the allocation size including alignment overhead, and it goes negative on overflow 😭🔥. That is the whole return vibe, no cap.

🌈 SEE ALSO 🌈

go read these, bestie — they are all right here, fr fr:

• Kernel file ./net/netfilter/nft_set_pipapo.c Theory of Operation(9)
• pipapo_refill(9)
• pipapo_get_slow(9)
• pipapo_get(9)
• nft_pipapo_lookup(9)
• nft_pipapo_get(9)
• pipapo_realloc_mt(9)
• pipapo_resize(9)
• pipapo_bucket_set(9)
• pipapo_lt_4b_to_8b(9)
• pipapo_lt_8b_to_4b(9)
• pipapo_lt_bits_adjust(9)
• pipapo_insert(9)
• pipapo_step_diff(9)
• pipapo_step_after_end(9)
• pipapo_base_sum(9)
• pipapo_expand(9)
• pipapo_map(9)
• pipapo_free_scratch(9)
• pipapo_realloc_scratch(9)
• pipapo_maybe_clone(9)
• nft_pipapo_insert(9)
• pipapo_clone(9)
• pipapo_rules_same_key(9)
• pipapo_unmap(9)
• pipapo_drop(9)
• pipapo_gc_scan(9)
• pipapo_gc_queue(9)
• pipapo_free_fields(9)
• pipapo_reclaim_match(9)
• nft_pipapo_commit(9)
• nft_pipapo_activate(9)
• nft_pipapo_deactivate(9)
• nft_pipapo_flush(9)
• pipapo_get_boundaries(9)
• pipapo_match_field(9)
• nft_pipapo_remove(9)
• nft_pipapo_do_walk(9)
• nft_pipapo_walk(9)
• nft_pipapo_privsize(9)
• nft_pipapo_estimate(9)
• nft_pipapo_init(9)
• nft_set_pipapo_match_destroy(9)
• nft_pipapo_destroy(9)
• nft_pipapo_gc_init(9)

mwah 💋 this page lives under ./net/netfilter, it is dated October 2026, and it is giving lt_calculate_size(9) main-character energy — slay 🫶🌈👑