ethernet.c File Reference

Ethernet over EtherCAT (EoE). More...

Go to the source code of this file.

Macros
#define	SUSE_VERSION   0
#define	SUSE_PATCHLEVEL   0
#define	EOE_DEBUG_LEVEL   1
	Defines the debug level of EoE processing. More...
#define	EC_EOE_TX_QUEUE_SIZE   100
	Size of the EoE tx queue.
#define	EC_EOE_TRIES   100
	Number of tries.

Functions
void	ec_eoe_flush (ec_eoe_t *eoe)
	Empties the transmit queue. More...
int	ec_eoe_send (ec_eoe_t *eoe)
	Sends a frame or the next fragment. More...
void	ec_eoe_state_rx_start (ec_eoe_t *eoe)
	State: RX_START. More...
void	ec_eoe_state_rx_fetch (ec_eoe_t *eoe)
	State: RX_FETCH. More...
void	ec_eoe_state_tx_start (ec_eoe_t *eoe)
	State: TX START. More...
void	ec_eoe_state_tx_sent (ec_eoe_t *eoe)
	State: TX SENT. More...
int	ec_eoedev_open (struct net_device *dev)
	Opens the virtual network device. More...
int	ec_eoedev_stop (struct net_device *dev)
	Stops the virtual network device. More...
int	ec_eoedev_tx (struct sk_buff *skb, struct net_device *dev)
	Transmits data via the virtual network device. More...
struct net_device_stats *	ec_eoedev_stats (struct net_device *dev)
	Gets statistics about the virtual network device. More...
int	ec_eoe_init (ec_eoe_t *eoe, ec_slave_t *slave)
	EoE constructor. More...
void	ec_eoe_clear (ec_eoe_t *eoe)
	EoE destructor. More...
void	ec_eoe_run (ec_eoe_t *eoe)
	Runs the EoE state machine. More...
void	ec_eoe_queue (ec_eoe_t *eoe)
	Queues the datagram, if necessary. More...
int	ec_eoe_is_open (const ec_eoe_t *eoe)
	Returns the state of the device. More...
int	ec_eoe_holds_mbox_lock (const ec_eoe_t *eoe)
	Returns, if the handler holds the mailbox read lock of its slave. More...
int	ec_eoe_is_idle (const ec_eoe_t *eoe)
	Returns the idle state. More...

Variables
static const struct net_device_ops	ec_eoedev_ops
	Device operations for EoE interfaces. More...

Detailed Description

Ethernet over EtherCAT (EoE).

Definition in file ethernet.c.

Macro Definition Documentation

EOE_DEBUG_LEVEL

#define EOE_DEBUG_LEVEL   1

Defines the debug level of EoE processing.

0 = No debug messages. 1 = Output warnings. 2 = Output actions. 3 = Output actions and frame data.

Definition at line 62 of file ethernet.c.

Function Documentation

ec_eoe_flush()

void ec_eoe_flush

(

ec_eoe_t *

eoe

)

Empties the transmit queue.

Parameters

eoe	EoE handler

Definition at line 251 of file ethernet.c.

ec_eoe_send()

int ec_eoe_send

(

ec_eoe_t *

eoe

)

Sends a frame or the next fragment.

Returns

Zero on success, otherwise a negative error code.

Parameters

eoe	EoE handler

Definition at line 276 of file ethernet.c.

ec_eoe_state_rx_start()

void ec_eoe_state_rx_start

(

ec_eoe_t *

eoe

)

State: RX_START.

Starts a new receiving sequence by checking the slave's mailbox once for a new EoE message.

Todo:

Use both devices.

Parameters

eoe	EoE handler

Definition at line 446 of file ethernet.c.

ec_eoe_state_rx_fetch()

void ec_eoe_state_rx_fetch

(

ec_eoe_t *

eoe

)

State: RX_FETCH.

Checks and fetches the mailbox and processes the EoE data.

Parameters

eoe	EoE handler

Definition at line 466 of file ethernet.c.

ec_eoe_state_tx_start()

void ec_eoe_state_tx_start

(

ec_eoe_t *

eoe

)

State: TX START.

Starts a new transmit sequence. If no data is available, a new receive sequence is started instead.

Todo:

Use both devices.

Parameters

eoe	EoE handler

Definition at line 670 of file ethernet.c.

ec_eoe_state_tx_sent()

void ec_eoe_state_tx_sent

(

ec_eoe_t *

eoe

)

State: TX SENT.

Checks is the previous transmit datagram succeded and sends the next fragment, if necessary.

Parameters

eoe	EoE handler

Definition at line 745 of file ethernet.c.

ec_eoedev_open()

int ec_eoedev_open

(

struct net_device *

dev

)

Opens the virtual network device.

Returns

Always zero (success).

Parameters

dev	EoE net_device

Definition at line 811 of file ethernet.c.

ec_eoedev_stop()

int ec_eoedev_stop

(

struct net_device *

dev

)

Stops the virtual network device.

Returns

Always zero (success).

Parameters

dev	EoE net_device

Definition at line 832 of file ethernet.c.

ec_eoedev_tx()

int ec_eoedev_tx	(	struct sk_buff *	skb,
		struct net_device *	dev
	)

Transmits data via the virtual network device.

Returns

Zero on success, non-zero on failure.

Parameters

skb	transmit socket buffer
dev	EoE net_device

Definition at line 853 of file ethernet.c.

ec_eoedev_stats()

struct net_device_stats * ec_eoedev_stats

(

struct net_device *

dev

)

Gets statistics about the virtual network device.

Returns

Statistics.

Parameters

dev	EoE net_device

Definition at line 906 of file ethernet.c.

ec_eoe_init()

int ec_eoe_init	(	ec_eoe_t *	eoe,
		ec_slave_t *	slave
	)

EoE constructor.

Initializes the EoE handler, creates a net_device and registers it.

Returns

Zero on success, otherwise a negative error code.

Parameters

eoe	EoE handler
slave	EtherCAT slave

Definition at line 111 of file ethernet.c.

ec_eoe_clear()

void ec_eoe_clear

(

ec_eoe_t *

eoe

)

EoE destructor.

Unregisteres the net_device and frees allocated memory.

Parameters

eoe	EoE handler

Definition at line 226 of file ethernet.c.

ec_eoe_run()

void ec_eoe_run

(

ec_eoe_t *

eoe

)

Runs the EoE state machine.

Parameters

eoe	EoE handler

Definition at line 348 of file ethernet.c.

ec_eoe_queue()

void ec_eoe_queue

(

ec_eoe_t *

eoe

)

Queues the datagram, if necessary.

Parameters

eoe	EoE handler

Definition at line 391 of file ethernet.c.

ec_eoe_is_open()

int ec_eoe_is_open

(

const ec_eoe_t *

eoe

)

Returns the state of the device.

Returns

1 if the device is "up", 0 if it is "down"

Parameters

eoe	EoE handler

Definition at line 405 of file ethernet.c.

ec_eoe_holds_mbox_lock()

int ec_eoe_holds_mbox_lock

(

const ec_eoe_t *

eoe

)

Returns, if the handler holds the mailbox read lock of its slave.

This is the case, while a mailbox check or fetch is in progress.

Returns

Non-zero, if the mailbox read lock is held.

Parameters

eoe	EoE handler

Definition at line 418 of file ethernet.c.

ec_eoe_is_idle()

int ec_eoe_is_idle

(

const ec_eoe_t *

eoe

)

Returns the idle state.

Return values

1	The device is idle.
0	The device is busy.

Parameters

eoe	EoE handler

Definition at line 430 of file ethernet.c.

Variable Documentation

ec_eoedev_ops

const struct net_device_ops ec_eoedev_ops

static

Initial value:

= {
    .ndo_open = ec_eoedev_open,
    .ndo_stop = ec_eoedev_stop,
    .ndo_start_xmit = ec_eoedev_tx,
    .ndo_get_stats = ec_eoedev_stats,
}

Device operations for EoE interfaces.

Definition at line 96 of file ethernet.c.