ATM_HDR_VPI_MASK
tpd->atm_header.vpi = (*cell_header & ATM_HDR_VPI_MASK) >> ATM_HDR_VPI_SHIFT;
vpi = (header & ATM_HDR_VPI_MASK) >> ATM_HDR_VPI_SHIFT;
(((u32 *)skb->data)[0] & (ATM_HDR_VPI_MASK | ATM_HDR_VCI_MASK)) !=