What is the default esp_eth_update_input_path() handler function?

By default, esp-idf or the Arduino framework handles incoming Ethernet packets using the

static esp_err_t eth_input_to_netif(esp_eth_handle_t eth_handle, uint8_t *buffer, uint32_t length, void *priv);

function in components/esp_eth/src/esp_eth_netif_glue.c which (besides calling just calls the exported functionesp_netif_receive():

static esp_err_t eth_input_to_netif(esp_eth_handle_t eth_handle, uint8_t *buffer, uint32_t length, void *priv)
{
    return esp_netif_receive((esp_netif_t *)priv, buffer, length, NULL);
}

The function esp_netif_receive() is declared in esp_netif.h and implemented in esp_netif_lwip.c.

This function will call esp_netif->lwip_input_fn(...) on the packet, which will in turn call the interface-type specific .input_fn(...), which is one of

• ethernetif_input
• wlanif_input

or for wrapped interfaces:

• esp_netif_lwip_slip_input
• esp_netif_lwip_ppp_input