36 static bool xenvif_rx_ring_slots_available(struct xenvif_queue *queue)  in xenvif_rx_ring_slots_available()  argument
43 	spin_lock_irqsave(&queue->rx_queue.lock, flags);  in xenvif_rx_ring_slots_available()
45 	skb = skb_peek(&queue->rx_queue);  in xenvif_rx_ring_slots_available()
47 		spin_unlock_irqrestore(&queue->rx_queue.lock, flags);  in xenvif_rx_ring_slots_available()
57 	spin_unlock_irqrestore(&queue->rx_queue.lock, flags);  in xenvif_rx_ring_slots_available()
60 		prod = queue->rx.sring->req_prod;  in xenvif_rx_ring_slots_available()
61 		cons = queue->rx.req_cons;  in xenvif_rx_ring_slots_available()
66 		queue->rx.sring->req_event = prod + 1;  in xenvif_rx_ring_slots_available()
72 	} while (queue->rx.sring->req_prod != prod);  in xenvif_rx_ring_slots_available()
77 void xenvif_rx_queue_tail(struct xenvif_queue *queue, struct sk_buff *skb)  in xenvif_rx_queue_tail()  argument
81 	spin_lock_irqsave(&queue->rx_queue.lock, flags);  in xenvif_rx_queue_tail()
83 	__skb_queue_tail(&queue->rx_queue, skb);  in xenvif_rx_queue_tail()
85 	queue->rx_queue_len += skb->len;  in xenvif_rx_queue_tail()
86 	if (queue->rx_queue_len > queue->rx_queue_max) {  in xenvif_rx_queue_tail()
87 		struct net_device *dev = queue->vif->dev;  in xenvif_rx_queue_tail()
89 		netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id));  in xenvif_rx_queue_tail()
92 	spin_unlock_irqrestore(&queue->rx_queue.lock, flags);  in xenvif_rx_queue_tail()
95 static struct sk_buff *xenvif_rx_dequeue(struct xenvif_queue *queue)  in xenvif_rx_dequeue()  argument
99 	spin_lock_irq(&queue->rx_queue.lock);  in xenvif_rx_dequeue()
101 	skb = __skb_dequeue(&queue->rx_queue);  in xenvif_rx_dequeue()
103 		queue->rx_queue_len -= skb->len;  in xenvif_rx_dequeue()
104 		if (queue->rx_queue_len < queue->rx_queue_max) {  in xenvif_rx_dequeue()
107 			txq = netdev_get_tx_queue(queue->vif->dev, queue->id);  in xenvif_rx_dequeue()
112 	spin_unlock_irq(&queue->rx_queue.lock);  in xenvif_rx_dequeue()
117 static void xenvif_rx_queue_purge(struct xenvif_queue *queue)  in xenvif_rx_queue_purge()  argument
121 	while ((skb = xenvif_rx_dequeue(queue)) != NULL)  in xenvif_rx_queue_purge()
125 static void xenvif_rx_queue_drop_expired(struct xenvif_queue *queue)  in xenvif_rx_queue_drop_expired()  argument
130 		skb = skb_peek(&queue->rx_queue);  in xenvif_rx_queue_drop_expired()
135 		xenvif_rx_dequeue(queue);  in xenvif_rx_queue_drop_expired()
140 static void xenvif_rx_copy_flush(struct xenvif_queue *queue)  in xenvif_rx_copy_flush()  argument
145 	gnttab_batch_copy(queue->rx_copy.op, queue->rx_copy.num);  in xenvif_rx_copy_flush()
147 	for (i = 0; i < queue->rx_copy.num; i++) {  in xenvif_rx_copy_flush()
150 		op = &queue->rx_copy.op[i];  in xenvif_rx_copy_flush()
158 			rsp = RING_GET_RESPONSE(&queue->rx,  in xenvif_rx_copy_flush()
159 						queue->rx_copy.idx[i]);  in xenvif_rx_copy_flush()
164 	queue->rx_copy.num = 0;  in xenvif_rx_copy_flush()
167 	RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&queue->rx, notify);  in xenvif_rx_copy_flush()
169 		notify_remote_via_irq(queue->rx_irq);  in xenvif_rx_copy_flush()
171 	__skb_queue_purge(queue->rx_copy.completed);  in xenvif_rx_copy_flush()
174 static void xenvif_rx_copy_add(struct xenvif_queue *queue,  in xenvif_rx_copy_add()  argument
182 	if (queue->rx_copy.num == COPY_BATCH_SIZE)  in xenvif_rx_copy_add()
183 		xenvif_rx_copy_flush(queue);  in xenvif_rx_copy_add()
185 	op = &queue->rx_copy.op[queue->rx_copy.num];  in xenvif_rx_copy_add()
203 	op->dest.domid    = queue->vif->domid;  in xenvif_rx_copy_add()
207 	queue->rx_copy.idx[queue->rx_copy.num] = queue->rx.req_cons;  in xenvif_rx_copy_add()
208 	queue->rx_copy.num++;  in xenvif_rx_copy_add()
233 static void xenvif_rx_next_skb(struct xenvif_queue *queue,  in xenvif_rx_next_skb()  argument
239 	skb = xenvif_rx_dequeue(queue);  in xenvif_rx_next_skb()
241 	queue->stats.tx_bytes += skb->len;  in xenvif_rx_next_skb()
242 	queue->stats.tx_packets++;  in xenvif_rx_next_skb()
253 	if ((1 << gso_type) & queue->vif->gso_mask) {  in xenvif_rx_next_skb()
268 	if (queue->vif->xdp_headroom) {  in xenvif_rx_next_skb()
274 		extra->u.xdp.headroom = queue->vif->xdp_headroom;  in xenvif_rx_next_skb()
309 static void xenvif_rx_complete(struct xenvif_queue *queue,  in xenvif_rx_complete()  argument
313 	queue->rx.rsp_prod_pvt = queue->rx.req_cons;  in xenvif_rx_complete()
315 	__skb_queue_tail(queue->rx_copy.completed, pkt->skb);  in xenvif_rx_complete()
336 static void xenvif_rx_next_chunk(struct xenvif_queue *queue,  in xenvif_rx_next_chunk()  argument
374 static void xenvif_rx_data_slot(struct xenvif_queue *queue,  in xenvif_rx_data_slot()  argument
379 	unsigned int offset = queue->vif->xdp_headroom;  in xenvif_rx_data_slot()
386 		xenvif_rx_next_chunk(queue, pkt, offset, &data, &len);  in xenvif_rx_data_slot()
387 		xenvif_rx_copy_add(queue, req, offset, data, len);  in xenvif_rx_data_slot()
418 static void xenvif_rx_extra_slot(struct xenvif_queue *queue,  in xenvif_rx_extra_slot()  argument
442 static void xenvif_rx_skb(struct xenvif_queue *queue)  in xenvif_rx_skb()  argument
446 	xenvif_rx_next_skb(queue, &pkt);  in xenvif_rx_skb()
448 	queue->last_rx_time = jiffies;  in xenvif_rx_skb()
454 		req = RING_GET_REQUEST(&queue->rx, queue->rx.req_cons);  in xenvif_rx_skb()
455 		rsp = RING_GET_RESPONSE(&queue->rx, queue->rx.req_cons);  in xenvif_rx_skb()
459 			xenvif_rx_extra_slot(queue, &pkt, req, rsp);  in xenvif_rx_skb()
461 			xenvif_rx_data_slot(queue, &pkt, req, rsp);  in xenvif_rx_skb()
463 		queue->rx.req_cons++;  in xenvif_rx_skb()
467 	xenvif_rx_complete(queue, &pkt);  in xenvif_rx_skb()
472 void xenvif_rx_action(struct xenvif_queue *queue)  in xenvif_rx_action()  argument
478 	queue->rx_copy.completed = &completed_skbs;  in xenvif_rx_action()
480 	while (xenvif_rx_ring_slots_available(queue) &&  in xenvif_rx_action()
482 		xenvif_rx_skb(queue);  in xenvif_rx_action()
487 	xenvif_rx_copy_flush(queue);  in xenvif_rx_action()
490 static bool xenvif_rx_queue_stalled(struct xenvif_queue *queue)  in xenvif_rx_queue_stalled()  argument
494 	prod = queue->rx.sring->req_prod;  in xenvif_rx_queue_stalled()
495 	cons = queue->rx.req_cons;  in xenvif_rx_queue_stalled()
497 	return !queue->stalled &&  in xenvif_rx_queue_stalled()
500 			   queue->last_rx_time + queue->vif->stall_timeout);  in xenvif_rx_queue_stalled()
503 static bool xenvif_rx_queue_ready(struct xenvif_queue *queue)  in xenvif_rx_queue_ready()  argument
507 	prod = queue->rx.sring->req_prod;  in xenvif_rx_queue_ready()
508 	cons = queue->rx.req_cons;  in xenvif_rx_queue_ready()
510 	return queue->stalled && prod - cons >= 1;  in xenvif_rx_queue_ready()
513 bool xenvif_have_rx_work(struct xenvif_queue *queue, bool test_kthread)  in xenvif_have_rx_work()  argument
515 	return xenvif_rx_ring_slots_available(queue) ||  in xenvif_have_rx_work()
516 		(queue->vif->stall_timeout &&  in xenvif_have_rx_work()
517 		 (xenvif_rx_queue_stalled(queue) ||  in xenvif_have_rx_work()
518 		  xenvif_rx_queue_ready(queue))) ||  in xenvif_have_rx_work()
520 		queue->vif->disabled;  in xenvif_have_rx_work()
523 static long xenvif_rx_queue_timeout(struct xenvif_queue *queue)  in xenvif_rx_queue_timeout()  argument
528 	skb = skb_peek(&queue->rx_queue);  in xenvif_rx_queue_timeout()
539  * queue (and not just the head at the beginning).  In particular, if
540  * the queue is initially empty an infinite timeout is used and this
546 static void xenvif_wait_for_rx_work(struct xenvif_queue *queue)  in xenvif_wait_for_rx_work()  argument
550 	if (xenvif_have_rx_work(queue, true))  in xenvif_wait_for_rx_work()
556 		prepare_to_wait(&queue->wq, &wait, TASK_INTERRUPTIBLE);  in xenvif_wait_for_rx_work()
557 		if (xenvif_have_rx_work(queue, true))  in xenvif_wait_for_rx_work()
560 					&queue->eoi_pending) &  in xenvif_wait_for_rx_work()
562 			xen_irq_lateeoi(queue->rx_irq, 0);  in xenvif_wait_for_rx_work()
564 		ret = schedule_timeout(xenvif_rx_queue_timeout(queue));  in xenvif_wait_for_rx_work()
568 	finish_wait(&queue->wq, &wait);  in xenvif_wait_for_rx_work()
571 static void xenvif_queue_carrier_off(struct xenvif_queue *queue)  in xenvif_queue_carrier_off()  argument
573 	struct xenvif *vif = queue->vif;  in xenvif_queue_carrier_off()
575 	queue->stalled = true;  in xenvif_queue_carrier_off()
577 	/* At least one queue has stalled? Disable the carrier. */  in xenvif_queue_carrier_off()
586 static void xenvif_queue_carrier_on(struct xenvif_queue *queue)  in xenvif_queue_carrier_on()  argument
588 	struct xenvif *vif = queue->vif;  in xenvif_queue_carrier_on()
590 	queue->last_rx_time = jiffies; /* Reset Rx stall detection. */  in xenvif_queue_carrier_on()
591 	queue->stalled = false;  in xenvif_queue_carrier_on()
604 	struct xenvif_queue *queue = data;  in xenvif_kthread_guest_rx()  local
605 	struct xenvif *vif = queue->vif;  in xenvif_kthread_guest_rx()
608 		xenvif_queue_carrier_on(queue);  in xenvif_kthread_guest_rx()
611 		xenvif_wait_for_rx_work(queue);  in xenvif_kthread_guest_rx()
621 		 * associated with queue 0.  in xenvif_kthread_guest_rx()
623 		if (unlikely(vif->disabled && queue->id == 0)) {  in xenvif_kthread_guest_rx()
628 		if (!skb_queue_empty(&queue->rx_queue))  in xenvif_kthread_guest_rx()
629 			xenvif_rx_action(queue);  in xenvif_kthread_guest_rx()
636 			if (xenvif_rx_queue_stalled(queue))  in xenvif_kthread_guest_rx()
637 				xenvif_queue_carrier_off(queue);  in xenvif_kthread_guest_rx()
638 			else if (xenvif_rx_queue_ready(queue))  in xenvif_kthread_guest_rx()
639 				xenvif_queue_carrier_on(queue);  in xenvif_kthread_guest_rx()
647 		xenvif_rx_queue_drop_expired(queue);  in xenvif_kthread_guest_rx()
653 	xenvif_rx_queue_purge(queue);  in xenvif_kthread_guest_rx()