46 /* Number of bytes allowed on the internal guest Rx queue. */
54 void xenvif_skb_zerocopy_prepare(struct xenvif_queue *queue,  in xenvif_skb_zerocopy_prepare()  argument
58 	atomic_inc(&queue->inflight_packets);  in xenvif_skb_zerocopy_prepare()
61 void xenvif_skb_zerocopy_complete(struct xenvif_queue *queue)  in xenvif_skb_zerocopy_complete()  argument
63 	atomic_dec(&queue->inflight_packets);  in xenvif_skb_zerocopy_complete()
69 	wake_up(&queue->dealloc_wq);  in xenvif_skb_zerocopy_complete()
79 static bool xenvif_handle_tx_interrupt(struct xenvif_queue *queue)  in xenvif_handle_tx_interrupt()  argument
83 	rc = RING_HAS_UNCONSUMED_REQUESTS(&queue->tx);  in xenvif_handle_tx_interrupt()
85 		napi_schedule(&queue->napi);  in xenvif_handle_tx_interrupt()
91 	struct xenvif_queue *queue = dev_id;  in xenvif_tx_interrupt()  local
94 	old = atomic_fetch_or(NETBK_TX_EOI, &queue->eoi_pending);  in xenvif_tx_interrupt()
97 	if (!xenvif_handle_tx_interrupt(queue)) {  in xenvif_tx_interrupt()
98 		atomic_andnot(NETBK_TX_EOI, &queue->eoi_pending);  in xenvif_tx_interrupt()
107 	struct xenvif_queue *queue =  in xenvif_poll()  local
115 	if (unlikely(queue->vif->disabled)) {  in xenvif_poll()
120 	work_done = xenvif_tx_action(queue, budget);  in xenvif_poll()
124 		/* If the queue is rate-limited, it shall be  in xenvif_poll()
127 		if (likely(!queue->rate_limited))  in xenvif_poll()
128 			xenvif_napi_schedule_or_enable_events(queue);  in xenvif_poll()
134 static bool xenvif_handle_rx_interrupt(struct xenvif_queue *queue)  in xenvif_handle_rx_interrupt()  argument
138 	rc = xenvif_have_rx_work(queue, false);  in xenvif_handle_rx_interrupt()
140 		xenvif_kick_thread(queue);  in xenvif_handle_rx_interrupt()
146 	struct xenvif_queue *queue = dev_id;  in xenvif_rx_interrupt()  local
149 	old = atomic_fetch_or(NETBK_RX_EOI, &queue->eoi_pending);  in xenvif_rx_interrupt()
152 	if (!xenvif_handle_rx_interrupt(queue)) {  in xenvif_rx_interrupt()
153 		atomic_andnot(NETBK_RX_EOI, &queue->eoi_pending);  in xenvif_rx_interrupt()
162 	struct xenvif_queue *queue = dev_id;  in xenvif_interrupt()  local
166 	old = atomic_fetch_or(NETBK_COMMON_EOI, &queue->eoi_pending);  in xenvif_interrupt()
169 	has_tx = xenvif_handle_tx_interrupt(queue);  in xenvif_interrupt()
170 	has_rx = xenvif_handle_rx_interrupt(queue);  in xenvif_interrupt()
173 		atomic_andnot(NETBK_COMMON_EOI, &queue->eoi_pending);  in xenvif_interrupt()
210 	struct xenvif_queue *queue = NULL;  in xenvif_start_xmit()  local
225 	/* Obtain the queue to be used to transmit this packet */  in xenvif_start_xmit()
228 		pr_warn_ratelimited("Invalid queue %hu for packet on interface %s\n",  in xenvif_start_xmit()
232 	queue = &vif->queues[index];  in xenvif_start_xmit()
234 	/* Drop the packet if queue is not ready */  in xenvif_start_xmit()
235 	if (queue->task == NULL ||  in xenvif_start_xmit()
236 	    queue->dealloc_task == NULL ||  in xenvif_start_xmit()
257 	if (!xenvif_rx_queue_tail(queue, skb))  in xenvif_start_xmit()
260 	xenvif_kick_thread(queue);  in xenvif_start_xmit()
273 	struct xenvif_queue *queue = NULL;  in xenvif_get_stats()  local
284 	/* Aggregate tx and rx stats from each queue */  in xenvif_get_stats()
286 		queue = &vif->queues[index];  in xenvif_get_stats()
287 		rx_bytes += queue->stats.rx_bytes;  in xenvif_get_stats()
288 		rx_packets += queue->stats.rx_packets;  in xenvif_get_stats()
289 		tx_bytes += queue->stats.tx_bytes;  in xenvif_get_stats()
290 		tx_packets += queue->stats.tx_packets;  in xenvif_get_stats()
305 	struct xenvif_queue *queue = NULL;  in xenvif_up()  local
310 		queue = &vif->queues[queue_index];  in xenvif_up()
311 		napi_enable(&queue->napi);  in xenvif_up()
312 		enable_irq(queue->tx_irq);  in xenvif_up()
313 		if (queue->tx_irq != queue->rx_irq)  in xenvif_up()
314 			enable_irq(queue->rx_irq);  in xenvif_up()
315 		xenvif_napi_schedule_or_enable_events(queue);  in xenvif_up()
321 	struct xenvif_queue *queue = NULL;  in xenvif_down()  local
326 		queue = &vif->queues[queue_index];  in xenvif_down()
327 		disable_irq(queue->tx_irq);  in xenvif_down()
328 		if (queue->tx_irq != queue->rx_irq)  in xenvif_down()
329 			disable_irq(queue->rx_irq);  in xenvif_down()
330 		napi_disable(&queue->napi);  in xenvif_down()
331 		del_timer_sync(&queue->credit_timeout);  in xenvif_down()
562 int xenvif_init_queue(struct xenvif_queue *queue)  in xenvif_init_queue()  argument
566 	queue->credit_bytes = queue->remaining_credit = ~0UL;  in xenvif_init_queue()
567 	queue->credit_usec  = 0UL;  in xenvif_init_queue()
568 	timer_setup(&queue->credit_timeout, xenvif_tx_credit_callback, 0);  in xenvif_init_queue()
569 	queue->credit_window_start = get_jiffies_64();  in xenvif_init_queue()
571 	queue->rx_queue_max = XENVIF_RX_QUEUE_BYTES;  in xenvif_init_queue()
573 	skb_queue_head_init(&queue->rx_queue);  in xenvif_init_queue()
574 	skb_queue_head_init(&queue->tx_queue);  in xenvif_init_queue()
576 	queue->pending_cons = 0;  in xenvif_init_queue()
577 	queue->pending_prod = MAX_PENDING_REQS;  in xenvif_init_queue()
579 		queue->pending_ring[i] = i;  in xenvif_init_queue()
581 	spin_lock_init(&queue->callback_lock);  in xenvif_init_queue()
582 	spin_lock_init(&queue->response_lock);  in xenvif_init_queue()
589 				 queue->mmap_pages);  in xenvif_init_queue()
591 		netdev_err(queue->vif->dev, "Could not reserve mmap_pages\n");  in xenvif_init_queue()
596 		queue->pending_tx_info[i].callback_struct = (struct ubuf_info_msgzc)  in xenvif_init_queue()
600 		queue->grant_tx_handle[i] = NETBACK_INVALID_HANDLE;  in xenvif_init_queue()
672 static void xenvif_disconnect_queue(struct xenvif_queue *queue)  in xenvif_disconnect_queue()  argument
674 	if (queue->task) {  in xenvif_disconnect_queue()
675 		kthread_stop(queue->task);  in xenvif_disconnect_queue()
676 		put_task_struct(queue->task);  in xenvif_disconnect_queue()
677 		queue->task = NULL;  in xenvif_disconnect_queue()
680 	if (queue->dealloc_task) {  in xenvif_disconnect_queue()
681 		kthread_stop(queue->dealloc_task);  in xenvif_disconnect_queue()
682 		queue->dealloc_task = NULL;  in xenvif_disconnect_queue()
685 	if (queue->napi.poll) {  in xenvif_disconnect_queue()
686 		netif_napi_del(&queue->napi);  in xenvif_disconnect_queue()
687 		queue->napi.poll = NULL;  in xenvif_disconnect_queue()
690 	if (queue->tx_irq) {  in xenvif_disconnect_queue()
691 		unbind_from_irqhandler(queue->tx_irq, queue);  in xenvif_disconnect_queue()
692 		if (queue->tx_irq == queue->rx_irq)  in xenvif_disconnect_queue()
693 			queue->rx_irq = 0;  in xenvif_disconnect_queue()
694 		queue->tx_irq = 0;  in xenvif_disconnect_queue()
697 	if (queue->rx_irq) {  in xenvif_disconnect_queue()
698 		unbind_from_irqhandler(queue->rx_irq, queue);  in xenvif_disconnect_queue()
699 		queue->rx_irq = 0;  in xenvif_disconnect_queue()
702 	xenvif_unmap_frontend_data_rings(queue);  in xenvif_disconnect_queue()
705 int xenvif_connect_data(struct xenvif_queue *queue,  in xenvif_connect_data()  argument
711 	struct xenbus_device *dev = xenvif_to_xenbus_device(queue->vif);  in xenvif_connect_data()
715 	BUG_ON(queue->tx_irq);  in xenvif_connect_data()
716 	BUG_ON(queue->task);  in xenvif_connect_data()
717 	BUG_ON(queue->dealloc_task);  in xenvif_connect_data()
719 	err = xenvif_map_frontend_data_rings(queue, tx_ring_ref,  in xenvif_connect_data()
724 	init_waitqueue_head(&queue->wq);  in xenvif_connect_data()
725 	init_waitqueue_head(&queue->dealloc_wq);  in xenvif_connect_data()
726 	atomic_set(&queue->inflight_packets, 0);  in xenvif_connect_data()
728 	netif_napi_add(queue->vif->dev, &queue->napi, xenvif_poll);  in xenvif_connect_data()
730 	queue->stalled = true;  in xenvif_connect_data()
732 	task = kthread_run(xenvif_kthread_guest_rx, queue,  in xenvif_connect_data()
733 			   "%s-guest-rx", queue->name);  in xenvif_connect_data()
736 	queue->task = task;  in xenvif_connect_data()
743 	task = kthread_run(xenvif_dealloc_kthread, queue,  in xenvif_connect_data()
744 			   "%s-dealloc", queue->name);  in xenvif_connect_data()
747 	queue->dealloc_task = task;  in xenvif_connect_data()
753 			queue->name, queue);  in xenvif_connect_data()
756 		queue->tx_irq = queue->rx_irq = err;  in xenvif_connect_data()
757 		disable_irq(queue->tx_irq);  in xenvif_connect_data()
760 		snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name),  in xenvif_connect_data()
761 			 "%s-tx", queue->name);  in xenvif_connect_data()
764 			queue->tx_irq_name, queue);  in xenvif_connect_data()
767 		queue->tx_irq = err;  in xenvif_connect_data()
768 		disable_irq(queue->tx_irq);  in xenvif_connect_data()
770 		snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name),  in xenvif_connect_data()
771 			 "%s-rx", queue->name);  in xenvif_connect_data()
774 			queue->rx_irq_name, queue);  in xenvif_connect_data()
777 		queue->rx_irq = err;  in xenvif_connect_data()
778 		disable_irq(queue->rx_irq);  in xenvif_connect_data()
784 	pr_warn("Could not allocate kthread for %s\n", queue->name);  in xenvif_connect_data()
787 	xenvif_disconnect_queue(queue);  in xenvif_connect_data()
806 	struct xenvif_queue *queue = NULL;  in xenvif_disconnect_data()  local
813 		queue = &vif->queues[queue_index];  in xenvif_disconnect_data()
815 		xenvif_disconnect_queue(queue);  in xenvif_disconnect_data()
837  * Used for queue teardown from xenvif_free(), and on the
840 void xenvif_deinit_queue(struct xenvif_queue *queue)  in xenvif_deinit_queue()  argument
842 	gnttab_free_pages(MAX_PENDING_REQS, queue->mmap_pages);  in xenvif_deinit_queue()