ZeroCopyRx.c File Reference

Go to the source code of this file.

Classes
struct	my_custom_pbuf

Typedefs
typedef struct my_custom_pbuf	my_custom_pbuf_t

Functions
	LWIP_MEMPOOL_DECLARE (RX_POOL, 10, sizeof(my_custom_pbuf_t), "Zero-copy RX PBUF pool")
void	my_pbuf_free_custom (void *p)
void	eth_rx_irq ()

Typedef Documentation

my_custom_pbuf_t

typedef struct my_custom_pbuf my_custom_pbuf_t

Function Documentation

eth_rx_irq()

void eth_rx_irq

(

)

Definition at line 25 of file ZeroCopyRx.c.

{
  dma_descriptor*   dma_desc = get_RX_DMA_descriptor_from_ethernet();
  my_custom_pbuf_t* my_pbuf  = (my_custom_pbuf_t*)LWIP_MEMPOOL_ALLOC(RX_POOL);
 
  my_pbuf->p.custom_free_function = my_pbuf_free_custom;
  my_pbuf->dma_descriptor         = dma_desc;
 
  invalidate_cpu_cache(dma_desc->rx_data, dma_desc->rx_length);
  
  struct pbuf* p = pbuf_alloced_custom(PBUF_RAW,
     dma_desc->rx_length,
     PBUF_REF,
     &my_pbuf->p,
     dma_desc->rx_data,
     dma_desc->max_buffer_size);
 
  if(netif->input(p, netif) != ERR_OK) {
    pbuf_free(p);
  }
}

LWIP_MEMPOOL_DECLARE()

LWIP_MEMPOOL_DECLARE	(	RX_POOL	,
		10	,
		sizeof(my_custom_pbuf_t)	,
		"Zero-copy RX PBUF pool"
	)

my_pbuf_free_custom()

void my_pbuf_free_custom

(

void *

p

)

Definition at line 9 of file ZeroCopyRx.c.

{
  SYS_ARCH_DECL_PROTECT(old_level);
 
  my_custom_pbuf_t* my_puf = (my_custom_pbuf_t*)p;
 
  // invalidate data cache here - lwIP and/or application may have written into buffer!
  // (invalidate is faster than flushing, and no one needs the correct data in the buffer)
  invalidate_cpu_cache(p->payload, p->tot_len);
 
  SYS_ARCH_PROTECT(old_level);
  free_rx_dma_descriptor(my_pbuf->dma_descriptor);
  LWIP_MEMPOOL_FREE(RX_POOL, my_pbuf);
  SYS_ARCH_UNPROTECT(old_level);
}

Referenced by eth_rx_irq().