i40e_tso(9)

💅 NAME

i40e_tso — ok so this one sets up the tso context descriptor ✨ (this is from the Kernel API Manual, bestie, we're in the big leagues now 👑)

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✨ SYNOPSIS

int i40e_tso (struct i40e_tx_buffer *first , u8 *hdr_len , u64 *cd_type_cmd_tso_mss );

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🎀 ARGUMENTS

• first — pointer to the first Tx buffer for xmit 🫶 like, the main character buffer of this transmit, the one everything starts from.
• hdr_len — ptr to the size of the packet header 📏 it's a pointer, so whatever it points at is getting the header size, no cap.
• cd_type_cmd_tso_mss — Quad Word 1 🌸 yep that's the whole description, it's giving "trust me, you know what this is."

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🦋 DESCRIPTION

Okay so here's the entire vibe check on the return value, and honestly it's just three outcomes:

• 0 — no TSO can happen 🙈 nothing to do here.
• 1 — tso is going 🔥 it's happening, it's slaying, off it goes.
• error — literally an error 💀 that's it, that's the third one.

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🌈 SEE ALSO

Kernel file ./drivers/net/ethernet/intel/i40e/i40e_txrx.c 👀 and then the whole friend group, because this function does not exist in isolation:

• i40e_fdir(9)
• i40e_program_fdir_filter(9)
• i40e_create_dummy_packet(9)
• i40e_create_dummy_udp_packet(9)
• i40e_create_dummy_tcp_packet(9)
• i40e_create_dummy_sctp_packet(9)
• i40e_prepare_fdir_filter(9)
• i40e_change_filter_num(9)
• i40e_add_del_fdir_udp(9)
• i40e_add_del_fdir_tcp(9)
• i40e_add_del_fdir_sctp(9)
• i40e_add_del_fdir_ip(9)
• i40e_add_del_fdir(9)
• i40e_fd_handle_status(9)
• i40e_unmap_and_free_tx_resource(9)
• i40e_clean_tx_ring(9)
• i40e_free_tx_resources(9)
• i40e_get_tx_pending(9)
• i40e_detect_recover_hung(9)
• i40e_clean_tx_irq(9)
• i40e_enable_wb_on_itr(9)
• i40e_force_wb(9)
• i40e_update_itr(9)
• i40e_reuse_rx_page(9)
• i40e_clean_programming_status(9)
• i40e_setup_tx_descriptors(9)
• i40e_clean_rx_ring(9)
• i40e_free_rx_resources(9)
• i40e_setup_rx_descriptors(9)
• i40e_release_rx_desc(9)
• i40e_alloc_mapped_page(9)
• i40e_alloc_rx_buffers(9)
• i40e_rx_checksum(9)
• i40e_rx_hash(9)
• i40e_process_skb_fields(9)
• i40e_cleanup_headers(9)
• i40e_can_reuse_rx_page(9)
• i40e_rx_buffer_flip(9)
• i40e_get_rx_buffer(9)
• i40e_put_rx_buffer(9)
• i40e_process_rx_buffs(9)
• i40e_construct_skb(9)
• i40e_build_skb(9)
• i40e_is_non_eop(9)
• i40e_run_xdp(9)
• i40e_xdp_ring_update_tail(9)
• i40e_update_rx_stats(9)
• i40e_finalize_xdp_rx(9)
• i40e_inc_ntp(9)
• i40e_add_xdp_frag(9)
• i40e_consume_xdp_buff(9)
• i40e_clean_rx_irq(9)
• i40e_buildreg_itr(9)
• i40e_update_enable_itr(9)
• i40e_napi_poll(9)
• i40e_atr(9)
• i40e_tx_prepare_vlan_flags(9)
• i40e_tsyn(9)
• i40e_tx_enable_csum(9)
• i40e_create_tx_ctx(9)
• __i40e_maybe_stop_tx(9)
• __i40e_chk_linearize(9)
• i40e_tx_map(9)
• i40e_xmit_xdp_ring(9)
• i40e_xmit_frame_ring(9)
• i40e_lan_xmit_frame(9)
• i40e_xdp_xmit(9)

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ok that's the whole page bestie, every single one of those (9)s is accounted for, no skipping, we don't do that here 💅

mwah 💜 this page lives in ./drivers/net/ethernet/intel/i40e and it's dated October 2026 — yeah, future energy, we stay ahead of the timeline 🕰️✨