axienet_start_xmit(9)

💅 axienet_start_xmit(9) — the Kernel API Manual entry that's literally about kicking off a transmission ✨

okay bestie so welcome to the Kernel API Manual, and today's main character is axienet_start_xmit 🎀 This little icon is the function that gets the packets moving, and we're gonna go through the whole page top to bottom, no skips, no cap 💖

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🌸 NAME 🌸

axienet_start_xmit — starts the transmission. that's it, that's the vibe. it's giving "press send" energy 📤✨

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🦋 SYNOPSIS 🦋

netdev_tx_t axienet_start_xmit (struct sk_buff *skb , struct net_device
       *ndev );

like, that's the whole signature, slay 💅

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🎀 ARGUMENTS 🎀

• skb — a sk_buff pointer holding the data that's about to be Txed 👑 this is the actual payload bestie, treat her with respect.
• ndev — a pointer to the net_device structure 🫶 that's the network device hanging out on the other end of things.

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⭐ RETURN ⭐

• NETDEV_TX_OK — you get this on success, periodt ✨
• NETDEV_TX_BUSY — you get this if any of the descriptors are not free 😭 like the queue said "no room, come back later."

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💜 DESCRIPTION 💜

okay so here's the lore 🌈 This function is invoked from upper layers to initiate transmission. she's not out here starting drama, she's out here starting sending 📨

What she does: uses the next available free BDs and populates their fields to start the transmission 👑 very "fill in the blanks and go" of her.

And additionally — and this is the ✨extra✨ part — if checksum offloading is supported, she populates the AXI Stream Control fields with appropriate values 🧚 the way that she handles the offload detail too?? obsessed.

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🔥 SEE ALSO 🔥

y'all this list is long but we do not skip a single one, bestie, every single reference stays 🫶

• Kernel file ./drivers/net/ethernet/xilinx/xilinx_axienet_main.c
• axienet_dma_in32(9)
• axienet_dma_bd_release(9)
• axienet_calc_cr(9)
• axienet_coalesce_params(9)
• axienet_dma_start(9)
• axienet_dma_bd_init(9)
• axienet_set_mac_address(9)
• netdev_set_mac_address(9)
• axienet_set_multicast_list(9)
• axienet_setoptions(9)
• axienet_dma_stop(9)
• axienet_device_reset(9)
• axienet_free_tx_chain(9)
• axienet_check_tx_bd_space(9)
• axienet_dma_tx_cb(9)
• axienet_start_xmit_dmaengine(9)
• axienet_tx_poll(9)
• axienet_dma_rx_cb(9)
• axienet_rx_poll(9)
• axienet_tx_irq(9)
• axienet_rx_irq(9)
• axienet_eth_irq(9)
• axienet_rx_submit_desc(9)
• axienet_init_dmaengine(9)
• axienet_init_legacy_dma(9)
• axienet_open(9)
• axienet_stop(9)
• axienet_change_mtu(9)
• axienet_poll_controller(9)
• axienet_ethtools_get_drvinfo(9)
• axienet_ethtools_get_regs_len(9)
• axienet_ethtools_get_regs(9)
• axienet_ethtools_get_pauseparam(9)
• axienet_ethtools_set_pauseparam(9)
• axienet_update_coalesce_rx(9)
• axienet_dim_coalesce_count_rx(9)
• axienet_rx_dim_work(9)
• axienet_update_coalesce_tx(9)
• axienet_ethtools_get_coalesce(9)
• axienet_ethtools_set_coalesce(9)
• axienet_dma_err_handler(9)
• axienet_probe(9)

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💀 friendly reminder bestie: NETDEV_TX_BUSY is not a failure, it's a "not right now" — do not panic, do not spiral 🙈

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and that's the page!! tysm for reading, mwah 🫶💖

sign-off time 🎀 this one lives under ./drivers/net/ethernet/xilinx, dated October 2026, and it's literally axienet_start_xmit(9) — the one and only, no notes, periodt ✨👑