FC_FRAME_HEADROOM 985 drivers/scsi/fnic/fnic_fcs.c len = FC_FRAME_HEADROOM + FC_MAX_FRAME + FC_FRAME_TAILROOM; FC_FRAME_HEADROOM 50 drivers/scsi/libfc/fc_frame.c skb = alloc_skb_fclone(len + FC_FRAME_HEADROOM + FC_FRAME_TAILROOM + FC_FRAME_HEADROOM 54 drivers/scsi/libfc/fc_frame.c skb_reserve(skb, NET_SKB_PAD + FC_FRAME_HEADROOM);