STRUCT ARC_EMAC_PRIV(9)

💅 NAME 💅

struct arc_emac_priv — the lil' storage locker where EMAC keeps all its private info 🎀 (yes bestie, this is from the Kernel API Manual, struct arc_emac_priv(9), and we're gonna get through it together)

✨ SYNOPSIS ✨

Okay so here's the whole struct, copy-pasted exactly, no cap — every field, in order, don't @ me:

struct arc_emac_priv {
    const char *drv_name;
    void (*set_mac_speed)(void *priv, unsigned int speed);
    struct device *dev;
    struct mii_bus *bus;
    struct arc_emac_mdio_bus_data bus_data;
    void __iomem *regs;
    struct clk *clk;
    struct napi_struct napi;
    struct arc_emac_bd *rxbd;
    struct arc_emac_bd *txbd;
    dma_addr_t rxbd_dma;
    dma_addr_t txbd_dma;
    struct buffer_state rx_buff[RX_BD_NUM];
    struct buffer_state tx_buff[TX_BD_NUM];
    unsigned int txbd_curr;
    unsigned int txbd_dirty;
    unsigned int last_rx_bd;
    unsigned int link;
    unsigned int duplex;
    unsigned int speed;
    unsigned int rx_missed_errors;
 };

not every field below got its own little write-up in the Members list — that's just how the page is, we're not inventing lore 🔮

🦋 Members 🦋

• dev — pointer to the current device 🫶 like, the device we're living in rn.
• bus — pointer to the current MII bus 🚌 (MII bus, not school bus, but same energy).
• regs — base address of the EMAC memory-mapped control registers 📍 this is where the knobs live.
• napi — structure for NAPI ⚡ the whole NAPI situation, structurally speaking.
• rxbd — pointer to the Rx BD ring 💫 receive ring, iconic.
• txbd — pointer to the Tx BD ring 💫 transmit ring, equally iconic.
• rxbd_dma — DMA handle for the Rx BD ring 🧚 the handle, specifically.
• txbd_dma — DMA handle for the Tx BD ring 🧚 same but for Tx, periodt.
• rx_buff — storage for Rx buffer states 🍓 where the receive buffers keep their state.
• tx_buff — storage for Tx buffer states 🍓 and where the transmit buffers keep theirs.
• txbd_curr — index of the Tx BD to use on the next "ndo_start_xmit" 🔥 yes it literally quotes it like that, we love a namedrop.
• txbd_dirty — index of the Tx BD to free on the next Tx interrupt 🧹 cleanup duties, someone's gotta do 'em.
• last_rx_bd — index of the last Rx BD we've got from EMAC 👀 last seen energy.
• link — PHY's last seen link state 🌈 lowkey a vibe check on the link.
• duplex — PHY's last set duplex mode 🔁 half or full, the PHY decided.
• speed — PHY's last set speed 💨 fast girl, whatever the PHY set.

🌸 SEE ALSO 🌸

• Kernel file ./drivers/net/ethernet/arc/emac.h
• struct arc_emac_bd(9)
• struct buffer_state(9)
• arc_reg_set(9)
• arc_reg_get(9)
• arc_reg_or(9)
• arc_reg_clr(9)

Go read those too bestie, we don't gatekeep 💖

and that's the whole page!! source/version vibes are the ./drivers/net/ethernet/arc directory, dated October 2026, and the header up top said struct arc_emac_priv(9) — slay, you're caught up 💅✨