IXGBEVF_RX_HDR_SIZE
srrctl |= IXGBEVF_RX_HDR_SIZE << IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT;
skb = napi_alloc_skb(&rx_ring->q_vector->napi, IXGBEVF_RX_HDR_SIZE);
if (headlen > IXGBEVF_RX_HDR_SIZE)
IXGBEVF_RX_HDR_SIZE);