skb_pp_frag_ref(9)

💖 NAME 💖

Okay bestie, this is skb_pp_frag_ref(9) from the Kernel API Manual, and it is here to explain one very specific skb ref-count move. One-line name-card energy:

skb_pp_frag_ref — Increase fragment references of a page pool aware skb. 💅

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✨ SYNOPSIS ✨

Here's the signature, no cap:

int skb_pp_frag_ref (struct sk_buff *skb );

That's literally it. Cute, right? 🎀

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🌸 ARGUMENTS 🌸

• skb — page pool aware skb. That's the input, bestie. 🫶

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🦋 DESCRIPTION 🦋

So what does it do? It increases the fragment reference count — that's pp_ref_count — of an skb. The whole point is to gain fragment references only for page pool aware skbs, i.e. when skb->pp_recycle is true, and not for fragments in a non-pp-recycling skb. Lowkey important distinction. ✨

It also has a fallback: it can increase references on normal pages, because page pool aware skbs may also have normal page fragments. So yeah, it's giving "handles both cases" energy. 🫶

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👑 SEE ALSO 👑

This page runs with a massive squad. The kernel file ./net/core/skbuff.c is in the mix, plus every single one of these beauties:

• Kernel file: ./net/core/skbuff.c
• 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)
• napi_build_skb(9)
• __alloc_skb(9)
• __netdev_alloc_skb(9)
• napi_alloc_skb(9)
• skb_pp_cow_data(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)

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Source/version vibes: ./net/core · October 2026 · page handle skb_pp_frag_ref(9). Bye bestie, slay your kernel debugging! 💅💖