RSI_DMA_ALIGN
#define RSI_HEADROOM_FOR_BT_HAL (RSI_FRAME_DESC_SIZE + RSI_DMA_ALIGN)
if (!IS_ALIGNED((unsigned long)skb->data, RSI_DMA_ALIGN)) {
skb_push(skb, RSI_DMA_ALIGN);
RSI_DMA_ALIGN) - skb->data);