drivers/media/dvb-core/dvb_net.c

Source file repositories/reference/linux-study-clean/drivers/media/dvb-core/dvb_net.c

File Facts

System
Linux kernel
Corpus path
drivers/media/dvb-core/dvb_net.c
Extension
.c
Size
43237 bytes
Lines
1668
Domain
Driver Families
Bucket
drivers/media
Inferred role
Driver Families: operation-table or driver-model contract
Status
pattern implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

static const struct net_device_ops dvb_netdev_ops = {
	.ndo_open		= dvb_net_open,
	.ndo_stop		= dvb_net_stop,
	.ndo_start_xmit		= dvb_net_tx,
	.ndo_set_rx_mode	= dvb_net_set_multicast_list,
	.ndo_set_mac_address    = dvb_net_set_mac,
	.ndo_validate_addr	= eth_validate_addr,
};

static void dvb_net_setup(struct net_device *dev)
{
	ether_setup(dev);

	dev->header_ops		= &dvb_header_ops;
	dev->netdev_ops		= &dvb_netdev_ops;
	dev->mtu		= 4096;
	dev->max_mtu		= 4096;

	dev->flags |= IFF_NOARP;
}

static int get_if(struct dvb_net *dvbnet)
{
	int i;

	for (i=0; i<DVB_NET_DEVICES_MAX; i++)
		if (!dvbnet->state[i])
			break;

	if (i == DVB_NET_DEVICES_MAX)
		return -1;

	dvbnet->state[i]=1;
	return i;
}

static int dvb_net_add_if(struct dvb_net *dvbnet, u16 pid, u8 feedtype)
{
	struct net_device *net;
	struct dvb_net_priv *priv;
	int result;
	int if_num;

	if (feedtype != DVB_NET_FEEDTYPE_MPE && feedtype != DVB_NET_FEEDTYPE_ULE)
		return -EINVAL;
	if ((if_num = get_if(dvbnet)) < 0)
		return -EINVAL;

	net = alloc_netdev(sizeof(struct dvb_net_priv), "dvb",
			   NET_NAME_UNKNOWN, dvb_net_setup);
	if (!net)
		return -ENOMEM;

	if (dvbnet->dvbdev->id)
		snprintf(net->name, IFNAMSIZ, "dvb%d%u%d",
			 dvbnet->dvbdev->adapter->num, dvbnet->dvbdev->id, if_num);
	else
		/* compatibility fix to keep dvb0_0 format */
		snprintf(net->name, IFNAMSIZ, "dvb%d_%d",
			 dvbnet->dvbdev->adapter->num, if_num);

	net->addr_len = 6;
	eth_hw_addr_set(net, dvbnet->dvbdev->adapter->proposed_mac);

	dvbnet->device[if_num] = net;

	priv = netdev_priv(net);
	priv->net = net;
	priv->demux = dvbnet->demux;
	priv->pid = pid;
	priv->rx_mode = RX_MODE_UNI;
	priv->need_pusi = 1;
	priv->tscc = 0;
	priv->feedtype = feedtype;
	reset_ule(priv);

	INIT_WORK(&priv->set_multicast_list_wq, wq_set_multicast_list);
	INIT_WORK(&priv->restart_net_feed_wq, wq_restart_net_feed);
	mutex_init(&priv->mutex);

	net->base_addr = pid;

	if ((result = register_netdev(net)) < 0) {
		dvbnet->device[if_num] = NULL;
		free_netdev(net);
		return result;
	}
	pr_info("created network interface %s\n", net->name);

	return if_num;

Annotation

Implementation Notes