drivers/s390/net/ctcm_main.c

Source file repositories/reference/linux-study-clean/drivers/s390/net/ctcm_main.c

File Facts

System
Linux kernel
Corpus path
drivers/s390/net/ctcm_main.c
Extension
.c
Size
45527 bytes
Lines
1781
Domain
Driver Families
Bucket
drivers/s390
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 ctcm_netdev_ops = {
	.ndo_open		= ctcm_open,
	.ndo_stop		= ctcm_close,
	.ndo_get_stats		= ctcm_stats,
	.ndo_change_mtu	   	= ctcm_change_mtu,
	.ndo_start_xmit		= ctcm_tx,
};

static const struct net_device_ops ctcm_mpc_netdev_ops = {
	.ndo_open		= ctcm_open,
	.ndo_stop		= ctcm_close,
	.ndo_get_stats		= ctcm_stats,
	.ndo_change_mtu	   	= ctcm_change_mtu,
	.ndo_start_xmit		= ctcmpc_tx,
};

static void ctcm_dev_setup(struct net_device *dev)
{
	dev->type = ARPHRD_SLIP;
	dev->tx_queue_len = 100;
	dev->flags = IFF_POINTOPOINT | IFF_NOARP;
	dev->min_mtu = 576;
	dev->max_mtu = 65527;
}

/*
 * Initialize everything of the net device except the name and the
 * channel structs.
 */
static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
{
	struct net_device *dev;
	struct mpc_group *grp;
	if (!priv)
		return NULL;

	if (IS_MPC(priv))
		dev = alloc_netdev(0, MPC_DEVICE_GENE, NET_NAME_UNKNOWN,
				   ctcm_dev_setup);
	else
		dev = alloc_netdev(0, CTC_DEVICE_GENE, NET_NAME_UNKNOWN,
				   ctcm_dev_setup);

	if (!dev) {
		CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
			"%s: MEMORY allocation ERROR",
			CTCM_FUNTAIL);
		return NULL;
	}
	dev->ml_priv = priv;
	priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
				CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
				dev_fsm, dev_fsm_len, GFP_KERNEL);
	if (priv->fsm == NULL) {
		CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
		free_netdev(dev);
		return NULL;
	}
	fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
	fsm_settimer(priv->fsm, &priv->restart_timer);

	if (IS_MPC(priv)) {
		/*  MPC Group Initializations  */
		grp = ctcmpc_init_mpc_group(priv);
		if (grp == NULL) {
			MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
			free_netdev(dev);
			return NULL;
		}
		tasklet_init(&grp->mpc_tasklet2,
				mpc_group_ready, (unsigned long)dev);
		dev->mtu = MPC_BUFSIZE_DEFAULT -
				TH_HEADER_LENGTH - PDU_HEADER_LENGTH;

		dev->netdev_ops = &ctcm_mpc_netdev_ops;
		dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
		priv->buffer_size = MPC_BUFSIZE_DEFAULT;
	} else {
		dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
		dev->netdev_ops = &ctcm_netdev_ops;
		dev->hard_header_len = LL_HEADER_LENGTH + 2;
	}

	CTCMY_DBF_DEV(SETUP, dev, "finished");

	return dev;
}

/*
 * Main IRQ handler.

Annotation

Implementation Notes