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Intel Ethernet i217: Difference between revisions
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Line 103:
#define TSTA_LC (1 << 2) // Late Collision
#define LSTA_TU (1 << 3) // Transmit Underrun
</source>
Now lets define the data structures for the transmit and receive buffers
<source lang="c">
#define E1000_NUM_RX_DESC 32
#define E1000_NUM_TX_DESC 8
struct e1000_rx_desc {
volatile uint64_t addr;
volatile uint16_t length;
volatile uint16_t checksum;
volatile uint8_t status;
volatile uint8_t errors;
volatile uint16_t special;
} __attribute__((packed));
struct e1000_tx_desc {
volatile uint64_t addr;
volatile uint16_t length;
volatile uint8_t cso;
volatile uint8_t cmd;
volatile uint8_t status;
volatile uint8_t css;
volatile uint16_t special;
} __attribute__((packed));
</source>
And finally some helper macros for MMIO read/write operations
<source lang="c">
#define mmio_read32(p) (*((volatile uint32_t*)(p)))
#define mmio_write32(p,v) ((*((volatile uint32_t*)(p)))=(v))
#define mmio_read16(p) (*((volatile uint16_t*)(p)))
#define mmio_write16(p,v) ((*((volatile uint16_t*)(p)))=(v))
#define mmio_read8(p) (*((volatile uint8_t*)(p)))
#define mmio_write8(p,v) ((*((volatile uint8_t*)(p)))=(v))
</source>
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