static int xennet_poll(struct napi_struct *napi, int budget)
{
	struct netfront_queue *queue = container_of(napi, struct netfront_queue, napi);
	struct net_device *dev = queue->info->netdev;
	struct sk_buff *skb;
	struct netfront_rx_info rinfo;
	struct xen_netif_rx_response *rx = &rinfo.rx;
	struct xen_netif_extra_info *extras = rinfo.extras;
	RING_IDX i, rp;
	int work_done;
	struct sk_buff_head rxq;
	struct sk_buff_head errq;
	struct sk_buff_head tmpq;
	int err;
	bool need_xdp_flush = false;

	spin_lock(&queue->rx_lock);

	skb_queue_head_init(&rxq);
	skb_queue_head_init(&errq);
	skb_queue_head_init(&tmpq);

	rp = queue->rx.sring->rsp_prod;
	if (RING_RESPONSE_PROD_OVERFLOW(&queue->rx, rp)) {
		dev_alert(&dev->dev, "Illegal number of responses %u\n",
			  rp - queue->rx.rsp_cons);
		queue->info->broken = true;
		spin_unlock(&queue->rx_lock);
		return 0;
	}
	rmb(); /* Ensure we see queued responses up to 'rp'. */

	i = queue->rx.rsp_cons;
	work_done = 0;
	while ((i != rp) && (work_done < budget)) {
		RING_COPY_RESPONSE(&queue->rx, i, rx);
		memset(extras, 0, sizeof(rinfo.extras));

		err = xennet_get_responses(queue, &rinfo, rp, &tmpq,
					   &need_xdp_flush);

		if (unlikely(err)) {
			if (queue->info->broken) {
				spin_unlock(&queue->rx_lock);
				return 0;
			}
err:
			while ((skb = __skb_dequeue(&tmpq)))
				__skb_queue_tail(&errq, skb);
			dev->stats.rx_errors++;
			i = queue->rx.rsp_cons;
			continue;
		}

		skb = __skb_dequeue(&tmpq);

		if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) {
			struct xen_netif_extra_info *gso;
			gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1];

			if (unlikely(xennet_set_skb_gso(skb, gso))) {
				__skb_queue_head(&tmpq, skb);
				xennet_set_rx_rsp_cons(queue,
						       queue->rx.rsp_cons +
						       skb_queue_len(&tmpq));
				goto err;
			}
		}

		NETFRONT_SKB_CB(skb)->pull_to = rx->status;
		if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD)
			NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD;

		skb_frag_off_set(&skb_shinfo(skb)->frags[0], rx->offset);
		skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status);
		skb->data_len = rx->status;
		skb->len += rx->status;

		if (unlikely(xennet_fill_frags(queue, skb, &tmpq)))
			goto err;

		if (rx->flags & XEN_NETRXF_csum_blank)
			skb->ip_summed = CHECKSUM_PARTIAL;
		else if (rx->flags & XEN_NETRXF_data_validated)
			skb->ip_summed = CHECKSUM_UNNECESSARY;

		__skb_queue_tail(&rxq, skb);

		i = queue->rx.rsp_cons + 1;
		xennet_set_rx_rsp_cons(queue, i);
		work_done++;
	}
	if (need_xdp_flush)
		xdp_do_flush();

	__skb_queue_purge(&errq);

	work_done -= handle_incoming_queue(queue, &rxq);

	xennet_alloc_rx_buffers(queue);

	if (work_done < budget) {
		int more_to_do = 0;

		napi_complete_done(napi, work_done);

		RING_FINAL_CHECK_FOR_RESPONSES(&queue->rx, more_to_do);
		if (more_to_do)
			napi_schedule(napi);
	}

	spin_unlock(&queue->rx_lock);

	return work_done;
}
static int xennet_poll(struct napi_struct *napi, int budget)
{
	struct netfront_queue *queue = container_of(napi, struct netfront_queue, napi);
	struct net_device *dev = queue->info->netdev;
	struct sk_buff *skb;
	struct netfront_rx_info rinfo;
	struct xen_netif_rx_response *rx = &rinfo.rx;
	struct xen_netif_extra_info *extras = rinfo.extras;
	RING_IDX i, rp;
	int work_done;
	struct sk_buff_head rxq;
	struct sk_buff_head errq;
	struct sk_buff_head tmpq;
	int err;
	bool need_xdp_flush = false;

	spin_lock(&queue->rx_lock);

	skb_queue_head_init(&rxq);
	skb_queue_head_init(&errq);
	skb_queue_head_init(&tmpq);

	rp = queue->rx.sring->rsp_prod;
	if (RING_RESPONSE_PROD_OVERFLOW(&queue->rx, rp)) {
		dev_alert(&dev->dev, "Illegal number of responses %u\n",
			  rp - queue->rx.rsp_cons);
		queue->info->broken = true;
		spin_unlock(&queue->rx_lock);
		return 0;
	}
	rmb();  

	i = queue->rx.rsp_cons;
	work_done = 0;
	while ((i != rp) && (work_done < budget)) {
		RING_COPY_RESPONSE(&queue->rx, i, rx);
		memset(extras, 0, sizeof(rinfo.extras));

		err = xennet_get_responses(queue, &rinfo, rp, &tmpq,
					   &need_xdp_flush);

		if (unlikely(err)) {
			if (queue->info->broken) {
				spin_unlock(&queue->rx_lock);
				return 0;
			}
err:
			while ((skb = __skb_dequeue(&tmpq)))
				__skb_queue_tail(&errq, skb);
			dev->stats.rx_errors++;
			i = queue->rx.rsp_cons;
			continue;
		}

		skb = __skb_dequeue(&tmpq);

		if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) {
			struct xen_netif_extra_info *gso;
			gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1];

			if (unlikely(xennet_set_skb_gso(skb, gso))) {
				__skb_queue_head(&tmpq, skb);
				xennet_set_rx_rsp_cons(queue,
						       queue->rx.rsp_cons +
						       skb_queue_len(&tmpq));
				goto err;
			}
		}

		NETFRONT_SKB_CB(skb)->pull_to = rx->status;
		if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD)
			NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD;

		skb_frag_off_set(&skb_shinfo(skb)->frags[0], rx->offset);
		skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status);
		skb->data_len = rx->status;
		skb->len += rx->status;

		if (unlikely(xennet_fill_frags(queue, skb, &tmpq)))
			goto err;

		if (rx->flags & XEN_NETRXF_csum_blank)
			skb->ip_summed = CHECKSUM_PARTIAL;
		else if (rx->flags & XEN_NETRXF_data_validated)
			skb->ip_summed = CHECKSUM_UNNECESSARY;

		__skb_queue_tail(&rxq, skb);

		i = queue->rx.rsp_cons + 1;
		xennet_set_rx_rsp_cons(queue, i);
		work_done++;
	}
	if (need_xdp_flush)
		xdp_do_flush();

	__skb_queue_purge(&errq);

	work_done -= handle_incoming_queue(queue, &rxq);

	xennet_alloc_rx_buffers(queue);

	if (work_done < budget) {
		int more_to_do = 0;

		napi_complete_done(napi, work_done);

		RING_FINAL_CHECK_FOR_RESPONSES(&queue->rx, more_to_do);
		if (more_to_do)
			napi_schedule(napi);
	}

	spin_unlock(&queue->rx_lock);

	return work_done;
}