RXW_PADDING
align_count = (4 - ((size + RXW_PADDING) % 4)) % 4;
skb_pull(skb, 4 + RXW_PADDING);
size = (rx_cmd_a & RX_CMD_A_LEN) - RXW_PADDING;
align_count = (4 - ((size + RXW_PADDING) % 4)) % 4;