Man page 9 : netif_receive_skb

netif_receive_skb - process receive buffer from network

int netif_receive_skb(struct sk_buff *  skb );

skb
    buffer to process

netif_receive_skb is the main receive data processing function. It always succeeds. The buffer may be dropped during processing for congestion control or by the protocol layers.

This function may only be called from softirq context and interrupts should be enabled.

Return values (usually ignored):

no congestion

packet was dropped