__napi_build_skb(9)

💖 NAME 💖

okay bestie, welcome to the Kernel API Manual entry for __napi_build_skb(9) — she's here to build a network buffer, and honestly? iconic. no cap 💅

✨ SYNOPSIS ✨

struct sk_buff * __napi_build_skb (void *data , unsigned int frag_size
);

🎀 ARGUMENTS 🎀

• data — the data buffer provided by caller 🫶
• frag_size — size of data. periodt.

🌸 DESCRIPTION 🌸

okay so this is the version of __build_skb that uses NAPI percpu caches to obtain skbuff_head instead of inplace allocation. it's giving “I have a cache and I know how to use it” energy, but for real that's the actual difference ✨

On success it returns a new sk_buff; on allocation failure it returns NULL 😭. that's the vibe check.

🦋 SEE ALSO 🦋

Kernel file ./net/core/skbuff.c is the home base, and the full bestie roster is:

• drop_reasons_register_subsys(9)
• drop_reasons_unregister_subsys(9)
• skb_panic(9)
• napi_skb_cache_get_bulk(9)
• __build_skb(9)
• build_skb_around(9)
• napi_build_skb(9)
• __alloc_skb(9)
• __netdev_alloc_skb(9)
• napi_alloc_skb(9)
• skb_pp_cow_data(9)
• skb_pp_frag_ref(9)
• __kfree_skb(9)
• sk_skb_reason_drop(9)
• skb_tx_error(9)
• consume_skb(9)
• __consume_stateless_skb(9)
• napi_consume_skb(9)
• alloc_skb_for_msg(9)
• skb_morph(9)
• skb_copy_ubufs(9)
• skb_clone(9)
• skb_copy(9)
• __pskb_copy_fclone(9)
• pskb_expand_head(9)
• skb_expand_head(9)
• skb_copy_expand(9)
• __skb_pad(9)
• pskb_put(9)
• skb_put(9)
• skb_push(9)
• skb_pull(9)
• skb_pull_data(9)
• skb_trim(9)
• __pskb_pull_tail(9)
• skb_copy_bits(9)
• skb_store_bits(9)
• skb_zerocopy(9)
• skb_dequeue(9)
• skb_dequeue_tail(9)
• skb_queue_purge_reason(9)
• skb_rbtree_purge(9)
• skb_queue_head(9)
• skb_queue_tail(9)
• skb_unlink(9)
• skb_append(9)
• skb_split(9)
• skb_shift(9)
• skb_prepare_seq_read(9)
• skb_seq_read(9)
• skb_abort_seq_read(9)
• skb_copy_seq_read(9)
• skb_find_text(9)
• skb_pull_rcsum(9)
• skb_segment(9)
• skb_to_sgvec(9)
• skb_cow_data(9)
• skb_clone_sk(9)
• skb_partial_csum_set(9)
• skb_checksum_setup(9)
• skb_checksum_maybe_trim(9)
• skb_checksum_trimmed(9)
• skb_try_coalesce(9)
• skb_scrub_packet(9)
• skb_eth_pop(9)
• skb_eth_push(9)
• skb_mpls_push(9)
• skb_mpls_pop(9)
• skb_mpls_update_lse(9)
• skb_mpls_dec_ttl(9)
• alloc_skb_with_frags(9)
• skb_condense(9)
• __skb_ext_alloc(9)
• __skb_ext_set(9)
• skb_ext_add(9)
• skb_attempt_defer_free(9)
• skb_splice_from_iter(9)

💋 mwah! this page is from the ./net/core source/version, dated October 2026, for __napi_build_skb(9). that's the tea, bestie 🫶