The Xilinx lwIP adapters work in interrupt mode. The receive interrupt handlers move the packet data from the EMAC/GigE and store them in a queue. The
function takes those packets from the queue, and passes them to lwIP; consequently, this function is required for lwIP operation in RAW mode. The following is a sample lwIP application in RAW mode.
int xemacif_input(struct netif *netif);