skb_frag_size_sub(9)

💅 skb_frag_size_sub(9) — from the Kernel API Manual, bestie

okay so picture this: you're deep in ./include/linux/skbuff.h territory, the manual is literally called the Kernel API Manual, and you've got one job — make a fragment smaller. Not the whole skb, just the fragment. This is that function. It's tiny, it's iconic, it does exactly one thing, and it eats. 🎀

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✨ NAME ✨

skb_frag_size_sub — decrements the size of a skb fragment by @delta 🦋

Like, that's it. That's the whole personality. She subtracts. She leaves. 👑

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🌸 SYNOPSIS 🌸

void skb_frag_size_sub (skb_frag_t *frag , int delta );

no return value, no drama, void and unbothered bestie 💅

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🫶 ARGUMENTS 🫶

• frag — the skb fragment in question, of type skb_frag_t *. this is the girly getting her size adjusted.
• delta — the value to subtract. an int. how much smaller we're making her. 📉

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🔥 SEE ALSO 🔥

okay this is the part where the whole friend group shows up, so let me introduce everyone from the Kernel file ./include/linux/skbuff.h — first up, skb checksums(9), skb_frag_size(9), skb_frag_size_set(9), skb_frag_size_add(9), skb_frag_must_loop(9), skb_frag_foreach_page(9), struct skb_shared_hwtstamps(9), dataref and headerless skbs(9), Basic sk_buff geometry(9), struct sk_buff(9), skb_pfmemalloc(9), skb_dst(9), skb_dstref_steal(9), skb_dstref_restore(9), skb_dst_set(9), skb_dst_set_noref(9), skb_dst_is_noref(9), skb_napi_id(9), skb_unref(9), kfree_skb(9), alloc_skb(9), skb_fclone_busy(9), alloc_skb_fclone(9), skb_pad(9).

then the queue girlies: skb_queue_empty(9), skb_queue_empty_lockless(9), skb_queue_is_last(9), skb_queue_is_first(9), skb_queue_next(9), skb_queue_prev(9), skb_get(9), skb_cloned(9), skb_header_cloned(9), __skb_header_release(9), skb_shared(9), skb_share_check(9), skb_unshare(9), skb_peek(9), __skb_peek(9), skb_peek_next(9), skb_peek_tail(9), skb_queue_len(9), skb_queue_len_lockless(9), __skb_queue_head_init(9), skb_queue_splice(9), skb_queue_splice_init(9), skb_queue_splice_tail(9), skb_queue_splice_tail_init(9), __skb_queue_after(9), __skb_queue_head(9), __skb_queue_tail(9), __skb_dequeue(9), __skb_dequeue_tail(9), skb_len_add(9), __skb_fill_netmem_desc(9), skb_fill_page_desc(9), skb_fill_page_desc_noacc(9).

roommates and headroom besties: skb_headroom(9), skb_tailroom(9), skb_availroom(9), skb_reserve(9), skb_tailroom_reserve(9), skb_reset_transport_header_careful(9), skb_set_transport_header_careful(9), pskb_trim_unique(9), skb_orphan(9), skb_orphan_frags(9), __skb_queue_purge_reason(9), netdev_alloc_frag(9), netdev_alloc_skb(9), __dev_alloc_pages(9), __dev_alloc_page(9), dev_page_is_reusable(9), skb_propagate_pfmemalloc(9).

and the frag fam — lowkey our closest relatives: skb_frag_off(9), skb_frag_off_add(9), skb_frag_off_set(9), skb_frag_off_copy(9), skb_frag_net_iov(9), skb_frag_page(9), skb_frag_netmem(9), skb_frag_address(9), skb_frag_address_safe(9), skb_frag_phys(9), skb_frag_page_copy(9), __skb_frag_dma_map(9), skb_clone_writable(9), skb_cow(9), skb_cow_head(9), skb_padto(9), __skb_put_padto(9), skb_put_padto(9), skb_linearize(9), skb_has_shared_frag(9), skb_linearize_cow(9).

checksum girlies stay winning: skb_postpull_rcsum(9), skb_postpush_rcsum(9), skb_push_rcsum(9), pskb_trim_rcsum(9), skb_needs_linearize(9), skb_get_timestamp(9), skb_data_move(9), skb_postpull_data_move(9), skb_postpush_data_move(9), skb_complete_tx_timestamp(9), skb_tstamp_tx(9), skb_tx_timestamp(9), skb_complete_wifi_ack(9), skb_checksum_complete(9), struct skb_ext(9), skb_checksum_none_assert(9), skb_head_is_locked(9).

that's the whole group chat, no cap, nobody left on read 🫶✨

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ngl the entire page is two arguments and a subtraction, but that's the vibe — small function, main character energy, and the SEE ALSO list is doing all the heavy lifting fr fr 💀

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okay that's the whole manual page bestie, and before you go: this little icon was brought to you from ./include/linux, dated October 2026 — mwah, slay, periodt, go subtract something 💖🌈⭐