42 static void xenvif_update_needed_slots(struct xenvif_queue *queue,  in xenvif_update_needed_slots()  argument
55 	WRITE_ONCE(queue->rx_slots_needed, needed);  in xenvif_update_needed_slots()
58 static bool xenvif_rx_ring_slots_available(struct xenvif_queue *queue)  in xenvif_rx_ring_slots_available()  argument
63 	needed = READ_ONCE(queue->rx_slots_needed);  in xenvif_rx_ring_slots_available()
68 		prod = queue->rx.sring->req_prod;  in xenvif_rx_ring_slots_available()
69 		cons = queue->rx.req_cons;  in xenvif_rx_ring_slots_available()
74 		queue->rx.sring->req_event = prod + 1;  in xenvif_rx_ring_slots_available()
80 	} while (queue->rx.sring->req_prod != prod);  in xenvif_rx_ring_slots_available()
85 bool xenvif_rx_queue_tail(struct xenvif_queue *queue, struct sk_buff *skb)  in xenvif_rx_queue_tail()  argument
90 	spin_lock_irqsave(&queue->rx_queue.lock, flags);  in xenvif_rx_queue_tail()
92 	if (queue->rx_queue_len >= queue->rx_queue_max) {  in xenvif_rx_queue_tail()
93 		struct net_device *dev = queue->vif->dev;  in xenvif_rx_queue_tail()
95 		netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id));  in xenvif_rx_queue_tail()
98 		if (skb_queue_empty(&queue->rx_queue))  in xenvif_rx_queue_tail()
99 			xenvif_update_needed_slots(queue, skb);  in xenvif_rx_queue_tail()
101 		__skb_queue_tail(&queue->rx_queue, skb);  in xenvif_rx_queue_tail()
103 		queue->rx_queue_len += skb->len;  in xenvif_rx_queue_tail()
106 	spin_unlock_irqrestore(&queue->rx_queue.lock, flags);  in xenvif_rx_queue_tail()
111 static struct sk_buff *xenvif_rx_dequeue(struct xenvif_queue *queue)  in xenvif_rx_dequeue()  argument
115 	spin_lock_irq(&queue->rx_queue.lock);  in xenvif_rx_dequeue()
117 	skb = __skb_dequeue(&queue->rx_queue);  in xenvif_rx_dequeue()
119 		xenvif_update_needed_slots(queue, skb_peek(&queue->rx_queue));  in xenvif_rx_dequeue()
121 		queue->rx_queue_len -= skb->len;  in xenvif_rx_dequeue()
122 		if (queue->rx_queue_len < queue->rx_queue_max) {  in xenvif_rx_dequeue()
125 			txq = netdev_get_tx_queue(queue->vif->dev, queue->id);  in xenvif_rx_dequeue()
130 	spin_unlock_irq(&queue->rx_queue.lock);  in xenvif_rx_dequeue()
135 static void xenvif_rx_queue_purge(struct xenvif_queue *queue)  in xenvif_rx_queue_purge()  argument
139 	while ((skb = xenvif_rx_dequeue(queue)) != NULL)  in xenvif_rx_queue_purge()
143 static void xenvif_rx_queue_drop_expired(struct xenvif_queue *queue)  in xenvif_rx_queue_drop_expired()  argument
148 		skb = skb_peek(&queue->rx_queue);  in xenvif_rx_queue_drop_expired()
153 		xenvif_rx_dequeue(queue);  in xenvif_rx_queue_drop_expired()
155 		queue->vif->dev->stats.rx_dropped++;  in xenvif_rx_queue_drop_expired()
159 static void xenvif_rx_copy_flush(struct xenvif_queue *queue)  in xenvif_rx_copy_flush()  argument
164 	gnttab_batch_copy(queue->rx_copy.op, queue->rx_copy.num);  in xenvif_rx_copy_flush()
166 	for (i = 0; i < queue->rx_copy.num; i++) {  in xenvif_rx_copy_flush()
169 		op = &queue->rx_copy.op[i];  in xenvif_rx_copy_flush()
177 			rsp = RING_GET_RESPONSE(&queue->rx,  in xenvif_rx_copy_flush()
178 						queue->rx_copy.idx[i]);  in xenvif_rx_copy_flush()
183 	queue->rx_copy.num = 0;  in xenvif_rx_copy_flush()
186 	RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&queue->rx, notify);  in xenvif_rx_copy_flush()
188 		notify_remote_via_irq(queue->rx_irq);  in xenvif_rx_copy_flush()
190 	__skb_queue_purge(queue->rx_copy.completed);  in xenvif_rx_copy_flush()
193 static void xenvif_rx_copy_add(struct xenvif_queue *queue,  in xenvif_rx_copy_add()  argument
201 	if (queue->rx_copy.num == COPY_BATCH_SIZE)  in xenvif_rx_copy_add()
202 		xenvif_rx_copy_flush(queue);  in xenvif_rx_copy_add()
204 	op = &queue->rx_copy.op[queue->rx_copy.num];  in xenvif_rx_copy_add()
222 	op->dest.domid    = queue->vif->domid;  in xenvif_rx_copy_add()
226 	queue->rx_copy.idx[queue->rx_copy.num] = queue->rx.req_cons;  in xenvif_rx_copy_add()
227 	queue->rx_copy.num++;  in xenvif_rx_copy_add()
252 static void xenvif_rx_next_skb(struct xenvif_queue *queue,  in xenvif_rx_next_skb()  argument
258 	skb = xenvif_rx_dequeue(queue);  in xenvif_rx_next_skb()
260 	queue->stats.tx_bytes += skb->len;  in xenvif_rx_next_skb()
261 	queue->stats.tx_packets++;  in xenvif_rx_next_skb()
272 	if ((1 << gso_type) & queue->vif->gso_mask) {  in xenvif_rx_next_skb()
287 	if (queue->vif->xdp_headroom) {  in xenvif_rx_next_skb()
293 		extra->u.xdp.headroom = queue->vif->xdp_headroom;  in xenvif_rx_next_skb()
328 static void xenvif_rx_complete(struct xenvif_queue *queue,  in xenvif_rx_complete()  argument
332 	queue->rx.rsp_prod_pvt = queue->rx.req_cons;  in xenvif_rx_complete()
334 	__skb_queue_tail(queue->rx_copy.completed, pkt->skb);  in xenvif_rx_complete()
355 static void xenvif_rx_next_chunk(struct xenvif_queue *queue,  in xenvif_rx_next_chunk()  argument
393 static void xenvif_rx_data_slot(struct xenvif_queue *queue,  in xenvif_rx_data_slot()  argument
398 	unsigned int offset = queue->vif->xdp_headroom;  in xenvif_rx_data_slot()
405 		xenvif_rx_next_chunk(queue, pkt, offset, &data, &len);  in xenvif_rx_data_slot()
406 		xenvif_rx_copy_add(queue, req, offset, data, len);  in xenvif_rx_data_slot()
437 static void xenvif_rx_extra_slot(struct xenvif_queue *queue,  in xenvif_rx_extra_slot()  argument
461 static void xenvif_rx_skb(struct xenvif_queue *queue)  in xenvif_rx_skb()  argument
465 	xenvif_rx_next_skb(queue, &pkt);  in xenvif_rx_skb()
467 	queue->last_rx_time = jiffies;  in xenvif_rx_skb()
473 		req = RING_GET_REQUEST(&queue->rx, queue->rx.req_cons);  in xenvif_rx_skb()
474 		rsp = RING_GET_RESPONSE(&queue->rx, queue->rx.req_cons);  in xenvif_rx_skb()
478 			xenvif_rx_extra_slot(queue, &pkt, req, rsp);  in xenvif_rx_skb()
480 			xenvif_rx_data_slot(queue, &pkt, req, rsp);  in xenvif_rx_skb()
482 		queue->rx.req_cons++;  in xenvif_rx_skb()
486 	xenvif_rx_complete(queue, &pkt);  in xenvif_rx_skb()
491 static void xenvif_rx_action(struct xenvif_queue *queue)  in xenvif_rx_action()  argument
497 	queue->rx_copy.completed = &completed_skbs;  in xenvif_rx_action()
499 	while (xenvif_rx_ring_slots_available(queue) &&  in xenvif_rx_action()
500 	       !skb_queue_empty(&queue->rx_queue) &&  in xenvif_rx_action()
502 		xenvif_rx_skb(queue);  in xenvif_rx_action()
507 	xenvif_rx_copy_flush(queue);  in xenvif_rx_action()
510 static RING_IDX xenvif_rx_queue_slots(const struct xenvif_queue *queue)  in xenvif_rx_queue_slots()  argument
514 	prod = queue->rx.sring->req_prod;  in xenvif_rx_queue_slots()
515 	cons = queue->rx.req_cons;  in xenvif_rx_queue_slots()
520 static bool xenvif_rx_queue_stalled(const struct xenvif_queue *queue)  in xenvif_rx_queue_stalled()  argument
522 	unsigned int needed = READ_ONCE(queue->rx_slots_needed);  in xenvif_rx_queue_stalled()
524 	return !queue->stalled &&  in xenvif_rx_queue_stalled()
525 		xenvif_rx_queue_slots(queue) < needed &&  in xenvif_rx_queue_stalled()
527 			   queue->last_rx_time + queue->vif->stall_timeout);  in xenvif_rx_queue_stalled()
530 static bool xenvif_rx_queue_ready(struct xenvif_queue *queue)  in xenvif_rx_queue_ready()  argument
532 	unsigned int needed = READ_ONCE(queue->rx_slots_needed);  in xenvif_rx_queue_ready()
534 	return queue->stalled && xenvif_rx_queue_slots(queue) >= needed;  in xenvif_rx_queue_ready()
537 bool xenvif_have_rx_work(struct xenvif_queue *queue, bool test_kthread)  in xenvif_have_rx_work()  argument
539 	return xenvif_rx_ring_slots_available(queue) ||  in xenvif_have_rx_work()
540 		(queue->vif->stall_timeout &&  in xenvif_have_rx_work()
541 		 (xenvif_rx_queue_stalled(queue) ||  in xenvif_have_rx_work()
542 		  xenvif_rx_queue_ready(queue))) ||  in xenvif_have_rx_work()
544 		queue->vif->disabled;  in xenvif_have_rx_work()
547 static long xenvif_rx_queue_timeout(struct xenvif_queue *queue)  in xenvif_rx_queue_timeout()  argument
552 	skb = skb_peek(&queue->rx_queue);  in xenvif_rx_queue_timeout()
570 static void xenvif_wait_for_rx_work(struct xenvif_queue *queue)  in xenvif_wait_for_rx_work()  argument
574 	if (xenvif_have_rx_work(queue, true))  in xenvif_wait_for_rx_work()
580 		prepare_to_wait(&queue->wq, &wait, TASK_INTERRUPTIBLE);  in xenvif_wait_for_rx_work()
581 		if (xenvif_have_rx_work(queue, true))  in xenvif_wait_for_rx_work()
584 					&queue->eoi_pending) &  in xenvif_wait_for_rx_work()
586 			xen_irq_lateeoi(queue->rx_irq, 0);  in xenvif_wait_for_rx_work()
588 		ret = schedule_timeout(xenvif_rx_queue_timeout(queue));  in xenvif_wait_for_rx_work()
592 	finish_wait(&queue->wq, &wait);  in xenvif_wait_for_rx_work()
595 static void xenvif_queue_carrier_off(struct xenvif_queue *queue)  in xenvif_queue_carrier_off()  argument
597 	struct xenvif *vif = queue->vif;  in xenvif_queue_carrier_off()
599 	queue->stalled = true;  in xenvif_queue_carrier_off()
610 static void xenvif_queue_carrier_on(struct xenvif_queue *queue)  in xenvif_queue_carrier_on()  argument
612 	struct xenvif *vif = queue->vif;  in xenvif_queue_carrier_on()
614 	queue->last_rx_time = jiffies; /* Reset Rx stall detection. */  in xenvif_queue_carrier_on()
615 	queue->stalled = false;  in xenvif_queue_carrier_on()
628 	struct xenvif_queue *queue = data;  in xenvif_kthread_guest_rx()  local
629 	struct xenvif *vif = queue->vif;  in xenvif_kthread_guest_rx()
632 		xenvif_queue_carrier_on(queue);  in xenvif_kthread_guest_rx()
635 		xenvif_wait_for_rx_work(queue);  in xenvif_kthread_guest_rx()
647 		if (unlikely(vif->disabled && queue->id == 0)) {  in xenvif_kthread_guest_rx()
652 		if (!skb_queue_empty(&queue->rx_queue))  in xenvif_kthread_guest_rx()
653 			xenvif_rx_action(queue);  in xenvif_kthread_guest_rx()
660 			if (xenvif_rx_queue_stalled(queue))  in xenvif_kthread_guest_rx()
661 				xenvif_queue_carrier_off(queue);  in xenvif_kthread_guest_rx()
662 			else if (xenvif_rx_queue_ready(queue))  in xenvif_kthread_guest_rx()
663 				xenvif_queue_carrier_on(queue);  in xenvif_kthread_guest_rx()
671 		xenvif_rx_queue_drop_expired(queue);  in xenvif_kthread_guest_rx()
677 	xenvif_rx_queue_purge(queue);  in xenvif_kthread_guest_rx()