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Documentation: Add example for zero-copy RX using custom PBUF

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This commit is contained in:
Dirk Ziegelmeier 2016-09-20 09:03:49 +02:00
parent 22907c7b27
commit 470dae613e
1 changed files with 34 additions and 0 deletions
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34
src/core/pbuf.c
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@ -32,6 +32,40 @@
*
* Therefore, looping through a pbuf of a single packet, has an
* loop end condition (tot_len == p->len), NOT (next == NULL).
*
* Example of custom pbuf usage for zero-copy RX:
@code{.c}
typedef struct my_custom_pbuf
{
struct pbuf_custom p;
void* dma_descriptor;
} my_custom_pbuf_t;
void my_pbuf_free_custom(void* p)
{
my_custom_pbuf_t* my_puf = (my_custom_pbuf_t*)p;
free_rx_dma_descriptor(my_pbuf->dma_descriptor);
my_pbuf_pool_put(my_pbuf);
}
void eth_rx_irq()
{
dma_descriptor* dma_desc = get_RX_DMA_descriptor_from_ethernet();
my_custom_pbuf_t* my_pbuf = my_pbuf_pool_get();
my_pbuf->p.custom_free_function = my_pbuf_free_custom;
my_pbuf->dma_descriptor = dma_desc;
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);
netif->input(p, netif);
}
@endcode
*/
/*