예제 #1
0
static void connect(struct backend_info *be)
{
	int err;
	struct xenbus_device *dev = be->dev;

	err = connect_rings(be);
	if (err)
		return;

	err = xen_net_read_mac(dev, be->vif->fe_dev_addr);
	if (err) {
		xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename);
		return;
	}

	xen_net_read_rate(dev, &be->vif->credit_bytes,
			  &be->vif->credit_usec);
	be->vif->remaining_credit = be->vif->credit_bytes;

	unregister_hotplug_status_watch(be);
	err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch,
				   hotplug_status_changed,
				   "%s/%s", dev->nodename, "hotplug-status");
	if (err) {
		/* Switch now, since we can't do a watch. */
		xenbus_switch_state(dev, XenbusStateConnected);
	} else {
		be->have_hotplug_status_watch = 1;
	}

	netif_wake_queue(be->vif->dev);
}
예제 #2
0
static void connect(struct backend_info *be)
{
	int err;
	struct xenbus_device *dev = be->dev;

	rtnl_lock();

	err = xen_net_read_mac(dev, be->netif->fe_dev_addr);
	if (err) {
		xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename);
		goto out;
	}

	xen_net_read_rate(dev, &be->netif->credit_bytes,
			  &be->netif->credit_usec);
	be->netif->remaining_credit = be->netif->credit_bytes;

	err = connect_rings(be);
	if (err)
		goto out;

	/* May not get a kick from the frontend, so start the tx_queue now. */
	if (!netbk_can_queue(be->netif->dev))
		netif_wake_queue(be->netif->dev);

out:
	rtnl_unlock();
}
예제 #3
0
파일: xenbus.c 프로젝트: lvxiang/xen
static void connect(struct backend_info *be)
{
	int err;
	struct xenbus_device *dev = be->dev;

	err = connect_rings(be);
	if (err)
		return;

	err = xen_net_read_mac(dev, be->vif->fe_dev_addr);
	if (err) {
		xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename);
		return;
	}

	/* mlr-begin :  read the priority the vif*/
	/*
	err = xen_read_priority(dev, &(be->vif->priority));	
	if (err) {		
		xenbus_dev_fatal(dev, err, "parsing %s/priority", dev->nodename);		
		return;	
	}	
	*/
	/* mlr-end */

	/* mlr-begin : changed, add para '&be->vif->credit_initial' */
	xen_net_read_rate(dev, &be->vif->credit_bytes,
			  &be->vif->credit_usec, &be->vif->credit_initial);
	printk("mlr: vif-%s credit initial is %ld\n", be->vif->dev->name, be->vif->credit_initial);
	/* mlr-end */
	be->vif->remaining_credit = be->vif->credit_bytes;

	unregister_hotplug_status_watch(be);
	err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch,
				   hotplug_status_changed,
				   "%s/%s", dev->nodename, "hotplug-status");
	if (err) {
		/* Switch now, since we can't do a watch. */
		xenbus_switch_state(dev, XenbusStateConnected);
	} else {
		be->have_hotplug_status_watch = 1;
	}

	netif_wake_queue(be->vif->dev);
}
예제 #4
0
파일: xenbus.c 프로젝트: gxt/linux
static void xen_net_rate_changed(struct xenbus_watch *watch,
				const char **vec, unsigned int len)
{
	struct xenvif *vif = container_of(watch, struct xenvif, credit_watch);
	struct xenbus_device *dev = xenvif_to_xenbus_device(vif);
	unsigned long   credit_bytes;
	unsigned long   credit_usec;
	unsigned int queue_index;

	xen_net_read_rate(dev, &credit_bytes, &credit_usec);
	for (queue_index = 0; queue_index < vif->num_queues; queue_index++) {
		struct xenvif_queue *queue = &vif->queues[queue_index];

		queue->credit_bytes = credit_bytes;
		queue->credit_usec = credit_usec;
		if (!mod_timer_pending(&queue->credit_timeout, jiffies) &&
			queue->remaining_credit > queue->credit_bytes) {
			queue->remaining_credit = queue->credit_bytes;
		}
	}
}
예제 #5
0
static void connect(struct backend_info *be)
{
	int err;
	struct xenbus_device *dev = be->dev;

	err = connect_rings(be);
	if (err)
		return;

	err = xen_net_read_mac(dev, be->netif->fe_dev_addr);
	if (err) {
		xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename);
		return;
	}

	xen_net_read_rate(dev, &be->netif->credit_bytes,
			  &be->netif->credit_usec);
	be->netif->remaining_credit = be->netif->credit_bytes;

	xenbus_switch_state(dev, XenbusStateConnected);
}
예제 #6
0
파일: xenbus.c 프로젝트: gxt/linux
static void connect(struct backend_info *be)
{
	int err;
	struct xenbus_device *dev = be->dev;
	unsigned long credit_bytes, credit_usec;
	unsigned int queue_index;
	unsigned int requested_num_queues;
	struct xenvif_queue *queue;

	/* Check whether the frontend requested multiple queues
	 * and read the number requested.
	 */
	err = xenbus_scanf(XBT_NIL, dev->otherend,
			   "multi-queue-num-queues",
			   "%u", &requested_num_queues);
	if (err < 0) {
		requested_num_queues = 1; /* Fall back to single queue */
	} else if (requested_num_queues > xenvif_max_queues) {
		/* buggy or malicious guest */
		xenbus_dev_fatal(dev, err,
				 "guest requested %u queues, exceeding the maximum of %u.",
				 requested_num_queues, xenvif_max_queues);
		return;
	}

	err = xen_net_read_mac(dev, be->vif->fe_dev_addr);
	if (err) {
		xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename);
		return;
	}

	xen_net_read_rate(dev, &credit_bytes, &credit_usec);
	xen_unregister_watchers(be->vif);
	xen_register_watchers(dev, be->vif);
	read_xenbus_vif_flags(be);

	err = connect_ctrl_ring(be);
	if (err) {
		xenbus_dev_fatal(dev, err, "connecting control ring");
		return;
	}

	/* Use the number of queues requested by the frontend */
	be->vif->queues = vzalloc(requested_num_queues *
				  sizeof(struct xenvif_queue));
	if (!be->vif->queues) {
		xenbus_dev_fatal(dev, -ENOMEM,
				 "allocating queues");
		return;
	}

	be->vif->num_queues = requested_num_queues;
	be->vif->stalled_queues = requested_num_queues;

	for (queue_index = 0; queue_index < requested_num_queues; ++queue_index) {
		queue = &be->vif->queues[queue_index];
		queue->vif = be->vif;
		queue->id = queue_index;
		snprintf(queue->name, sizeof(queue->name), "%s-q%u",
				be->vif->dev->name, queue->id);

		err = xenvif_init_queue(queue);
		if (err) {
			/* xenvif_init_queue() cleans up after itself on
			 * failure, but we need to clean up any previously
			 * initialised queues. Set num_queues to i so that
			 * earlier queues can be destroyed using the regular
			 * disconnect logic.
			 */
			be->vif->num_queues = queue_index;
			goto err;
		}

		queue->credit_bytes = credit_bytes;
		queue->remaining_credit = credit_bytes;
		queue->credit_usec = credit_usec;

		err = connect_data_rings(be, queue);
		if (err) {
			/* connect_data_rings() cleans up after itself on
			 * failure, but we need to clean up after
			 * xenvif_init_queue() here, and also clean up any
			 * previously initialised queues.
			 */
			xenvif_deinit_queue(queue);
			be->vif->num_queues = queue_index;
			goto err;
		}
	}

#ifdef CONFIG_DEBUG_FS
	xenvif_debugfs_addif(be->vif);
#endif /* CONFIG_DEBUG_FS */

	/* Initialisation completed, tell core driver the number of
	 * active queues.
	 */
	rtnl_lock();
	netif_set_real_num_tx_queues(be->vif->dev, requested_num_queues);
	netif_set_real_num_rx_queues(be->vif->dev, requested_num_queues);
	rtnl_unlock();

	xenvif_carrier_on(be->vif);

	unregister_hotplug_status_watch(be);
	err = xenbus_watch_pathfmt(dev, &be->hotplug_status_watch,
				   hotplug_status_changed,
				   "%s/%s", dev->nodename, "hotplug-status");
	if (!err)
		be->have_hotplug_status_watch = 1;

	netif_tx_wake_all_queues(be->vif->dev);

	return;

err:
	if (be->vif->num_queues > 0)
		xenvif_disconnect_data(be->vif); /* Clean up existing queues */
	vfree(be->vif->queues);
	be->vif->queues = NULL;
	be->vif->num_queues = 0;
	xenvif_disconnect_ctrl(be->vif);
	return;
}