IGB_RX_HDR_LEN
unsigned int size = IGB_RX_HDR_LEN;
srrctl = IGB_RX_HDR_LEN << E1000_SRRCTL_BSIZEHDRSIZE_SHIFT;
skb = napi_alloc_skb(&rx_ring->q_vector->napi, IGB_RX_HDR_LEN);
if (headlen > IGB_RX_HDR_LEN)
headlen = eth_get_headlen(skb->dev, xdp->data, IGB_RX_HDR_LEN);