idpf_rx_rsc(9)

🦋 idpf_rx_rsc — like, the RSC-fields-in-the-skb setter, from the Kernel API Manual ✨

okay so bestie, this is a page from the Kernel API Manual — section 9 — and it's all about idpf_rx_rsc. no cap, it's a tiny little function with a very specific job, and we're gonna get into it 💅

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🌸 NAME 🌸

idpf_rx_rsc — sets the RSC fields in the skb. that's it. that's the whole gig 🎀

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✨ SYNOPSIS ✨

int idpf_rx_rsc (struct idpf_rx_queue *rxq , struct sk_buff *skb , const
struct virtchnl2_rx_flex_desc_adv_nic_3 *rx_desc , struct libeth_rx_pt
decoded );

like, four whole arguments, and yes it's an int returning function, and yes the line breaks are exactly where the kernel says they are. main character formatting energy fr fr 🫶

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🧚 ARGUMENTS 🧚

here's who's who at this little party:

• rxq — the Rx descriptor ring that the packet is being transacted on. like, this is the ring the whole thing is happening on, okay? she's the venue 💖
• skb — pointer to the current skb being populated. this is the girl being filled in. we love a work-in-progress 👑
• rx_desc — the Receive descriptor. the receipt. the lore 🎀
• decoded — the decoded Rx packet type related fields. already decoded, already slaying, no extra work needed 🌟

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🌈 DESCRIPTION 🌈

so what does she actually do? she populates the skb fields with three things:

• the total number of RSC segments
• the RSC payload length
• the packet type

and that's the whole description. she's not doing side quests, she's not overachieving, she's just filling in those fields. lowkey iconic for knowing her lane 💅

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💀 RETURN 💀

• 0 on success 🎉
• an error code on failure 😭

so like, always check her return value bestie. don't just assume it worked. that's giving "trust issues" but make it kernel dev 🙈

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🍓 SEE ALSO 🍓

the mothership herself lives in the kernel file ./drivers/net/ethernet/intel/idpf/idpf_txrx.c — go read her, she's long but she's worth it 💜

and okay, the squad is enormous, like genuinely, so buckle up. here's everyone:

idpf_chk_linearize(9), idpf_tx_timeout(9), idpf_tx_buf_rel_all(9), idpf_tx_desc_rel(9), idpf_compl_desc_rel(9), idpf_tx_desc_rel_all(9), idpf_tx_buf_alloc_all(9), idpf_tx_desc_alloc(9), idpf_compl_desc_alloc(9), idpf_tx_desc_alloc_all(9), idpf_rx_page_rel(9), idpf_rx_hdr_buf_rel_all(9), idpf_rx_buf_rel_bufq(9), idpf_rx_buf_rel_all(9), idpf_rx_desc_rel(9), idpf_rx_desc_rel_bufq(9), idpf_rx_desc_rel_all(9), idpf_rx_buf_hw_update(9), idpf_rx_hdr_buf_alloc_all(9), idpf_post_buf_refill(9), idpf_rx_post_buf_desc(9), idpf_rx_post_init_bufs(9), idpf_rx_buf_alloc_singleq(9), idpf_rx_bufs_init_singleq(9), idpf_rx_buf_alloc_all(9), idpf_rx_bufs_init(9), idpf_rx_bufs_init_all(9), idpf_rx_desc_alloc(9), idpf_bufq_desc_alloc(9), idpf_rx_desc_alloc_all(9), idpf_vector_to_queue_set(9), idpf_qp_switch(9), idpf_txq_group_rel(9), idpf_rxq_sw_queue_rel(9), idpf_rxq_group_rel(9), idpf_vport_queue_grp_rel_all(9), idpf_vport_queues_rel(9), idpf_vport_init_fast_path_txqs(9), idpf_vport_init_num_qs(9), idpf_vport_calc_num_q_desc(9), idpf_vport_calc_total_qs(9), idpf_vport_calc_num_q_groups(9), idpf_vport_calc_numq_per_grp(9), idpf_rxq_set_descids(9), idpf_txq_group_alloc(9), idpf_rxq_group_alloc(9), idpf_vport_queue_grp_alloc_all(9), idpf_vport_queues_alloc(9), idpf_tx_read_tstamp(9), idpf_tx_splitq_clean(9), idpf_tx_clean_bufs(9), idpf_tx_handle_rs_completion(9), idpf_tx_clean_complq(9), idpf_wait_for_sw_marker_completion(9), idpf_tx_splitq_build_ctb(9), idpf_tx_splitq_build_flow_desc(9), idpf_txq_has_room(9), idpf_tx_maybe_stop_splitq(9), idpf_tx_buf_hw_update(9), idpf_tx_res_count_required(9), idpf_tx_splitq_bump_ntu(9), idpf_tx_get_free_buf_id(9), idpf_tx_splitq_pkt_err_unmap(9), idpf_tx_splitq_map(9), idpf_tso(9), idpf_tx_splitq_get_ctx_desc(9), idpf_tx_drop_skb(9), idpf_tx_tstamp(9), idpf_tx_set_tstamp_desc(9), idpf_tx_splitq_need_re(9), idpf_tx_splitq_frame(9), idpf_tx_start(9), idpf_rx_hash(9), idpf_rx_csum(9), idpf_rx_splitq_extract_csum_bits(9), idpf_rx_hwtstamp(9), __idpf_rx_process_skb_fields(9), idpf_rx_hsplit_wa(9), idpf_rx_splitq_test_staterr(9), idpf_rx_splitq_is_eop(9), idpf_rx_splitq_clean(9), idpf_rx_update_bufq_desc(9), idpf_rx_clean_refillq(9), idpf_rx_clean_refillq_all(9), idpf_vport_intr_clean_queues(9), idpf_vport_intr_napi_del_all(9), idpf_vport_intr_napi_dis_all(9), idpf_vport_intr_rel(9), idpf_vport_intr_rel_irq(9), idpf_vport_intr_dis_irq_all(9), idpf_vport_intr_buildreg_itr(9), idpf_update_dim_sample(9), idpf_net_dim(9), idpf_vport_intr_update_itr_ena_irq(9), idpf_vport_intr_req_irq(9), idpf_vport_intr_write_itr(9), idpf_vport_intr_ena_irq_all(9), idpf_vport_intr_dis_dim_all(9), idpf_vport_intr_deinit(9), idpf_tx_dim_work(9), idpf_rx_dim_work(9), idpf_init_dim(9), idpf_vport_intr_napi_ena_all(9), idpf_tx_splitq_clean_all(9), idpf_rx_splitq_clean_all(9), idpf_vport_splitq_napi_poll(9), idpf_vport_intr_map_vector_to_qs(9), idpf_vport_intr_init_vec_idx(9), idpf_vport_intr_napi_add_all(9), idpf_vport_intr_alloc(9), idpf_vport_intr_init(9), idpf_config_rss(9), idpf_fill_dflt_rss_lut(9), idpf_init_rss_lut(9), idpf_deinit_rss_lut(9)

like, that's the whole group chat and every single one of them got @'d. no one left on read 💀💖

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aaaand that's the page bestie!! 🎀 this one came from ./drivers/net/ethernet/intel/idpf, dated October 2026 — so yeah, mark your calendar, she's from the future apparently 🌈✨ bye ily, go populate some skb fields 🫶💜