44 /* Number of bytes allowed on the internal guest Rx queue. */
52 void xenvif_skb_zerocopy_prepare(struct xenvif_queue *queue,  in xenvif_skb_zerocopy_prepare()  argument
56 	atomic_inc(&queue->inflight_packets);  in xenvif_skb_zerocopy_prepare()
59 void xenvif_skb_zerocopy_complete(struct xenvif_queue *queue)  in xenvif_skb_zerocopy_complete()  argument
61 	atomic_dec(&queue->inflight_packets);  in xenvif_skb_zerocopy_complete()
67 	wake_up(&queue->dealloc_wq);  in xenvif_skb_zerocopy_complete()
77 static bool xenvif_handle_tx_interrupt(struct xenvif_queue *queue)  in xenvif_handle_tx_interrupt()  argument
81 	rc = RING_HAS_UNCONSUMED_REQUESTS(&queue->tx);  in xenvif_handle_tx_interrupt()
83 		napi_schedule(&queue->napi);  in xenvif_handle_tx_interrupt()
89 	struct xenvif_queue *queue = dev_id;  in xenvif_tx_interrupt()  local
92 	old = atomic_fetch_or(NETBK_TX_EOI, &queue->eoi_pending);  in xenvif_tx_interrupt()
95 	if (!xenvif_handle_tx_interrupt(queue)) {  in xenvif_tx_interrupt()
96 		atomic_andnot(NETBK_TX_EOI, &queue->eoi_pending);  in xenvif_tx_interrupt()
105 	struct xenvif_queue *queue =  in xenvif_poll()  local
113 	if (unlikely(queue->vif->disabled)) {  in xenvif_poll()
118 	work_done = xenvif_tx_action(queue, budget);  in xenvif_poll()
122 		/* If the queue is rate-limited, it shall be  in xenvif_poll()
125 		if (likely(!queue->rate_limited))  in xenvif_poll()
126 			xenvif_napi_schedule_or_enable_events(queue);  in xenvif_poll()
132 static bool xenvif_handle_rx_interrupt(struct xenvif_queue *queue)  in xenvif_handle_rx_interrupt()  argument
136 	rc = xenvif_have_rx_work(queue, false);  in xenvif_handle_rx_interrupt()
138 		xenvif_kick_thread(queue);  in xenvif_handle_rx_interrupt()
144 	struct xenvif_queue *queue = dev_id;  in xenvif_rx_interrupt()  local
147 	old = atomic_fetch_or(NETBK_RX_EOI, &queue->eoi_pending);  in xenvif_rx_interrupt()
150 	if (!xenvif_handle_rx_interrupt(queue)) {  in xenvif_rx_interrupt()
151 		atomic_andnot(NETBK_RX_EOI, &queue->eoi_pending);  in xenvif_rx_interrupt()
160 	struct xenvif_queue *queue = dev_id;  in xenvif_interrupt()  local
164 	old = atomic_fetch_or(NETBK_COMMON_EOI, &queue->eoi_pending);  in xenvif_interrupt()
167 	has_tx = xenvif_handle_tx_interrupt(queue);  in xenvif_interrupt()
168 	has_rx = xenvif_handle_rx_interrupt(queue);  in xenvif_interrupt()
171 		atomic_andnot(NETBK_COMMON_EOI, &queue->eoi_pending);  in xenvif_interrupt()
208 	struct xenvif_queue *queue = NULL;  in xenvif_start_xmit()  local
223 	/* Obtain the queue to be used to transmit this packet */  in xenvif_start_xmit()
226 		pr_warn_ratelimited("Invalid queue %hu for packet on interface %s\n",  in xenvif_start_xmit()
230 	queue = &vif->queues[index];  in xenvif_start_xmit()
232 	/* Drop the packet if queue is not ready */  in xenvif_start_xmit()
233 	if (queue->task == NULL ||  in xenvif_start_xmit()
234 	    queue->dealloc_task == NULL ||  in xenvif_start_xmit()
258 	if (!xenvif_rx_queue_tail(queue, skb))  in xenvif_start_xmit()
261 	xenvif_kick_thread(queue);  in xenvif_start_xmit()
274 	struct xenvif_queue *queue = NULL;  in xenvif_get_stats()  local
285 	/* Aggregate tx and rx stats from each queue */  in xenvif_get_stats()
287 		queue = &vif->queues[index];  in xenvif_get_stats()
288 		rx_bytes += queue->stats.rx_bytes;  in xenvif_get_stats()
289 		rx_packets += queue->stats.rx_packets;  in xenvif_get_stats()
290 		tx_bytes += queue->stats.tx_bytes;  in xenvif_get_stats()
291 		tx_packets += queue->stats.tx_packets;  in xenvif_get_stats()
306 	struct xenvif_queue *queue = NULL;  in xenvif_up()  local
311 		queue = &vif->queues[queue_index];  in xenvif_up()
312 		napi_enable(&queue->napi);  in xenvif_up()
313 		enable_irq(queue->tx_irq);  in xenvif_up()
314 		if (queue->tx_irq != queue->rx_irq)  in xenvif_up()
315 			enable_irq(queue->rx_irq);  in xenvif_up()
316 		xenvif_napi_schedule_or_enable_events(queue);  in xenvif_up()
322 	struct xenvif_queue *queue = NULL;  in xenvif_down()  local
327 		queue = &vif->queues[queue_index];  in xenvif_down()
328 		disable_irq(queue->tx_irq);  in xenvif_down()
329 		if (queue->tx_irq != queue->rx_irq)  in xenvif_down()
330 			disable_irq(queue->rx_irq);  in xenvif_down()
331 		napi_disable(&queue->napi);  in xenvif_down()
332 		del_timer_sync(&queue->credit_timeout);  in xenvif_down()
561 int xenvif_init_queue(struct xenvif_queue *queue)  in xenvif_init_queue()  argument
565 	queue->credit_bytes = queue->remaining_credit = ~0UL;  in xenvif_init_queue()
566 	queue->credit_usec  = 0UL;  in xenvif_init_queue()
567 	timer_setup(&queue->credit_timeout, xenvif_tx_credit_callback, 0);  in xenvif_init_queue()
568 	queue->credit_window_start = get_jiffies_64();  in xenvif_init_queue()
570 	queue->rx_queue_max = XENVIF_RX_QUEUE_BYTES;  in xenvif_init_queue()
572 	skb_queue_head_init(&queue->rx_queue);  in xenvif_init_queue()
573 	skb_queue_head_init(&queue->tx_queue);  in xenvif_init_queue()
575 	queue->pending_cons = 0;  in xenvif_init_queue()
576 	queue->pending_prod = MAX_PENDING_REQS;  in xenvif_init_queue()
578 		queue->pending_ring[i] = i;  in xenvif_init_queue()
580 	spin_lock_init(&queue->callback_lock);  in xenvif_init_queue()
581 	spin_lock_init(&queue->response_lock);  in xenvif_init_queue()
588 				 queue->mmap_pages);  in xenvif_init_queue()
590 		netdev_err(queue->vif->dev, "Could not reserve mmap_pages\n");  in xenvif_init_queue()
595 		queue->pending_tx_info[i].callback_struct = (struct ubuf_info_msgzc)  in xenvif_init_queue()
599 		queue->grant_tx_handle[i] = NETBACK_INVALID_HANDLE;  in xenvif_init_queue()
671 static void xenvif_disconnect_queue(struct xenvif_queue *queue)  in xenvif_disconnect_queue()  argument
673 	if (queue->task) {  in xenvif_disconnect_queue()
674 		kthread_stop_put(queue->task);  in xenvif_disconnect_queue()
675 		queue->task = NULL;  in xenvif_disconnect_queue()
678 	if (queue->dealloc_task) {  in xenvif_disconnect_queue()
679 		kthread_stop(queue->dealloc_task);  in xenvif_disconnect_queue()
680 		queue->dealloc_task = NULL;  in xenvif_disconnect_queue()
683 	if (queue->napi.poll) {  in xenvif_disconnect_queue()
684 		netif_napi_del(&queue->napi);  in xenvif_disconnect_queue()
685 		queue->napi.poll = NULL;  in xenvif_disconnect_queue()
688 	if (queue->tx_irq) {  in xenvif_disconnect_queue()
689 		unbind_from_irqhandler(queue->tx_irq, queue);  in xenvif_disconnect_queue()
690 		if (queue->tx_irq == queue->rx_irq)  in xenvif_disconnect_queue()
691 			queue->rx_irq = 0;  in xenvif_disconnect_queue()
692 		queue->tx_irq = 0;  in xenvif_disconnect_queue()
695 	if (queue->rx_irq) {  in xenvif_disconnect_queue()
696 		unbind_from_irqhandler(queue->rx_irq, queue);  in xenvif_disconnect_queue()
697 		queue->rx_irq = 0;  in xenvif_disconnect_queue()
700 	xenvif_unmap_frontend_data_rings(queue);  in xenvif_disconnect_queue()
703 int xenvif_connect_data(struct xenvif_queue *queue,  in xenvif_connect_data()  argument
709 	struct xenbus_device *dev = xenvif_to_xenbus_device(queue->vif);  in xenvif_connect_data()
713 	BUG_ON(queue->tx_irq);  in xenvif_connect_data()
714 	BUG_ON(queue->task);  in xenvif_connect_data()
715 	BUG_ON(queue->dealloc_task);  in xenvif_connect_data()
717 	err = xenvif_map_frontend_data_rings(queue, tx_ring_ref,  in xenvif_connect_data()
722 	init_waitqueue_head(&queue->wq);  in xenvif_connect_data()
723 	init_waitqueue_head(&queue->dealloc_wq);  in xenvif_connect_data()
724 	atomic_set(&queue->inflight_packets, 0);  in xenvif_connect_data()
726 	netif_napi_add(queue->vif->dev, &queue->napi, xenvif_poll);  in xenvif_connect_data()
728 	queue->stalled = true;  in xenvif_connect_data()
730 	task = kthread_run(xenvif_kthread_guest_rx, queue,  in xenvif_connect_data()
731 			   "%s-guest-rx", queue->name);  in xenvif_connect_data()
734 	queue->task = task;  in xenvif_connect_data()
741 	task = kthread_run(xenvif_dealloc_kthread, queue,  in xenvif_connect_data()
742 			   "%s-dealloc", queue->name);  in xenvif_connect_data()
745 	queue->dealloc_task = task;  in xenvif_connect_data()
751 			queue->name, queue);  in xenvif_connect_data()
754 		queue->tx_irq = queue->rx_irq = err;  in xenvif_connect_data()
755 		disable_irq(queue->tx_irq);  in xenvif_connect_data()
758 		snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name),  in xenvif_connect_data()
759 			 "%s-tx", queue->name);  in xenvif_connect_data()
762 			queue->tx_irq_name, queue);  in xenvif_connect_data()
765 		queue->tx_irq = err;  in xenvif_connect_data()
766 		disable_irq(queue->tx_irq);  in xenvif_connect_data()
768 		snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name),  in xenvif_connect_data()
769 			 "%s-rx", queue->name);  in xenvif_connect_data()
772 			queue->rx_irq_name, queue);  in xenvif_connect_data()
775 		queue->rx_irq = err;  in xenvif_connect_data()
776 		disable_irq(queue->rx_irq);  in xenvif_connect_data()
782 	pr_warn("Could not allocate kthread for %s\n", queue->name);  in xenvif_connect_data()
785 	xenvif_disconnect_queue(queue);  in xenvif_connect_data()
804 	struct xenvif_queue *queue = NULL;  in xenvif_disconnect_data()  local
811 		queue = &vif->queues[queue_index];  in xenvif_disconnect_data()
813 		xenvif_disconnect_queue(queue);  in xenvif_disconnect_data()
835  * Used for queue teardown from xenvif_free(), and on the
838 void xenvif_deinit_queue(struct xenvif_queue *queue)  in xenvif_deinit_queue()  argument
840 	gnttab_free_pages(MAX_PENDING_REQS, queue->mmap_pages);  in xenvif_deinit_queue()