bdx_fifo_init(9)

✨ bdx_fifo_init(9) ✨

okay so this is a page from the Kernel API Manual, and bestie, we're about to set up a fifo. no cap, it's giving "low-level but make it cute." let's get into it 💅

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🌸 NAME 🌸

bdx_fifo_init — create the TX/RX descriptor fifo for host-NIC communication. literally the bridge between your host and the NIC, and yes she ate 🫶

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🎀 SYNOPSIS 🎀

int bdx_fifo_init (struct bdx_priv *priv , struct fifo *f , int fsz_type
, u16 reg_CFG0 , u16 reg_CFG1 , u16 reg_RPTR , u16 reg_WPTR );

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🦋 ARGUMENTS 🦋

• priv — the NIC private structure. the main character of this whole situation.
• f — the fifo you're initializing. like, the actual fifo. that one.
• fsz_type — the fifo size type, and here's the menu: 0-4KB, 1-8KB, 2-16KB, 3-32KB. pick your fighter ⭐
• reg_CFG0 — offsets of registers relative to base address.
• reg_CFG1 — offsets of registers relative to base address.
• reg_RPTR — offsets of registers relative to base address.
• reg_WPTR — offsets of registers relative to base address.

yeah the last four all say the same thing, and no i'm not going to pretend otherwise — offsets of registers relative to base address, all four of them, periodt 💀

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💖 DESCRIPTION 💖

so here's the tea: 1K extra space is allocated at the end of the fifo to simplify processing of descriptors that wraps around fifo's end. iconic behavior honestly, it's like leaving a little extra room at the end of the row so nothing falls off 🌈

returns 0 on success, and a negative value on failure. simple as that, no drama 🙈

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🔥 SEE ALSO 🔥

kernel file ./drivers/net/ethernet/tehuti/tehuti.c and all her friends:

bdx_fifo_free(9), bdx_link_changed(9), bdx_isr_napi(9), bdx_fw_load(9), bdx_hw_start(9), bdx_close(9), bdx_open(9), __bdx_vlan_rx_vid(9), bdx_vlan_rx_add_vid(9), bdx_vlan_rx_kill_vid(9), bdx_change_mtu(9), bdx_rx_init(9), bdx_rx_free_skbs(9), bdx_rx_free(9), bdx_rx_alloc_skbs(9), bdx_rx_receive(9), __bdx_tx_db_ptr_next(9), bdx_tx_db_inc_rptr(9), bdx_tx_db_inc_wptr(9), bdx_tx_db_init(9), bdx_tx_db_close(9), bdx_tx_map_skb(9), bdx_tx_space(9), bdx_tx_transmit(9), bdx_tx_cleanup(9), bdx_tx_free_skbs(9), bdx_tx_push_desc(9), bdx_tx_push_desc_safe(9), bdx_probe(9), bdx_remove(9)

the whole squad, fr fr 👑

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that's the whole page bestie, go init that fifo 💜

okay so before i go — this one comes to you from ./drivers/net/ethernet/tehuti, dated October 2026. mwah, bye 🎀✨