napi_rx_handler(9)

✨ napi_rx_handler(9) ✨

okay so bestie, we're in the Kernel API Manual today and the star of the show is napi_rx_handler — the NAPI handler for RX processing 🎀

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🌸 NAME 🌸

napi_rx_handler — the NAPI handler for RX processing 💅

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🦋 SYNOPSIS 🦋

int napi_rx_handler (struct napi_struct *napi , int budget );

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✨ ARGUMENTS ✨

• napi — the napi instance 🫶
• budget — how many packets we can process in this round, like your fave limited-edition drop, there's a cap on how many you get per round 🔥

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💖 DESCRIPTION 💖

So this is the handler for new data events when you're using NAPI. And the iconic part? it does not need any locking or protection from interrupts — like, none at all, no cap 😭 Because data interrupts are already off at this point, and the other adapter interrupts don't interfere either. (And that second bit isn't even a concern at all with MSI-X, since non-data interrupts get their own separate handler. slay.)

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👑 SEE ALSO 👑

Kernel file ./drivers/net/ethernet/chelsio/cxgb4vf/sge.c — go read it, iykyk 📖

and the whole friend group of related pages, fr fr:

• get_buf_addr(9)
• is_buf_mapped(9)
• need_skb_unmap(9)
• txq_avail(9)
• fl_cap(9)
• fl_starving(9)
• map_skb(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)
• 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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okay that's the whole thing bestie, hope this ate 💜

source path is ./drivers/net/ethernet/chelsio... and this is dated October 2026 — catch you in the next manual page, mwah 🫶✨💅