map_skb(9)

💅 map_skb(9) — the Kernel API Manual, bestie edition

okay so picture this: you're in the Kernel API Manual, section 9, and the page is called map_skb. say it with me 💖

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✨ NAME ✨

map_skb — literally maps an skb so it can do DMA to the device. that's the whole vibe, no cap 🌸

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🎀 SYNOPSIS 🎀

int map_skb (struct device *dev , const struct sk_buff *skb , dma_addr_t
*addr );

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🦋 ARGUMENTS 🦋

• dev — the egress net device, like the one doing the leaving 👑
• skb — the packet you want to map, your main character packet fr fr
• addr — a pointer to the base of the DMA mapping array, it's giving "here's where the addresses go" ✨

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🌸 DESCRIPTION 🌸

Map an skb for DMA to the device, and it hands you back an array of DMA addresses. that's it, that's the function, and honestly? iconic 💅

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💜 SEE ALSO 💜

first up, the Kernel file, and yes it's a whole path so treat it right:

./drivers/net/ethernet/chelsio/cxgb4vf/sge.c

and then the friend group, the whole squad, every single one of them, no skips 🫶:

• get_buf_addr(9)
• is_buf_mapped(9)
• need_skb_unmap(9)
• txq_avail(9)
• fl_cap(9)
• fl_starving(9)
• free_tx_desc(9)
• reclaim_completed_tx(9)
• get_buf_size(9)
• free_rx_bufs(9)
• unmap_rx_buf(9)
• ring_fl_db(9)
• set_rx_sw_desc(9)
• refill_fl(9)
• alloc_ring(9)
• sgl_len(9)
• flits_to_desc(9)
• is_eth_imm(9)
• calc_tx_flits(9)
• write_sgl(9)
• ring_tx_db(9)
• inline_tx_skb(9)
• t4vf_eth_xmit(9)
• copy_frags(9)
• t4vf_pktgl_to_skb(9)
• t4vf_pktgl_free(9)
• do_gro(9)
• t4vf_ethrx_handler(9)
• is_new_response(9)
• restore_rx_bufs(9)
• rspq_next(9)
• process_responses(9)
• napi_rx_handler(9)
• t4vf_intr_handler(9)
• sge_rx_timer_cb(9)
• sge_tx_timer_cb(9)
• bar2_address(9)
• t4vf_sge_alloc_rxq(9)
• t4vf_sge_alloc_eth_txq(9)
• t4vf_free_sge_resources(9)
• t4vf_sge_start(9)
• t4vf_sge_stop(9)
• t4vf_sge_init(9)

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go read them. all of them. i'll wait 💀

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that's the page bestie!! 🧚 source/version is the chelsio path ./drivers/net/ethernet/chelsio... and it's dated October 2026, so mark your calendar, mwah 💖🎀⭐