Jx 518l Ethernet Driver -

Before downloading a driver, it is important to understand what the "Jx 518l" likely is.

The Jx518L is a family of single-chip Ethernet controllers targeting embedded and desktop systems. This paper documents a clean, modular driver architecture suitable for integration into Linux-like network stacks, emphasizing portability, robustness, and performance. Goals include minimal CPU overhead, efficient DMA usage, and graceful recovery from link events and hardware errors. Jx 518l Ethernet Driver

/* allocate DMA-coherent memory for rings */
tx_ring = dma_alloc_coherent(...);
rx_ring = dma_alloc_coherent(...);
/* program base addresses */
write_reg(TX_DESC_BASE_LO, lower_32(tx_ring_dma));
write_reg(TX_DESC_BASE_HI, upper_32(tx_ring_dma));
write_reg(RX_DESC_BASE_LO, lower_32(rx_ring_dma));
...
/* enable MAC */
write_reg(MAC_CTRL, MAC_CTRL_RX_EN | MAC_CTRL_TX_EN);

int jx518l_poll(struct napi_struct *napi, int budget) 
  struct queue *q = container_of(napi, struct queue, napi);
  int work = 0;
while (work < budget && has_completed_rx(q)) 
    struct skb *skb = process_rx_desc(q);
    napi_gro_receive(&q->napi, skb, q->gro_list);
    work++;
if (work < budget) 
    napi_complete(napi);
    unmask_irq(q->vector);
return work;