/******************************************************************************
*
* $Id$
*
* Copyright (C) 2006-2008 Florian Pose, Ingenieurgemeinschaft IgH
*
* This file is part of the IgH EtherCAT Master.
*
* The IgH EtherCAT Master is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2, as
* published by the Free Software Foundation.
*
* The IgH EtherCAT Master is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
* Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with the IgH EtherCAT Master; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* ---
*
* The license mentioned above concerns the source code only. Using the
* EtherCAT technology and brand is only permitted in compliance with the
* industrial property and similar rights of Beckhoff Automation GmbH.
*
*****************************************************************************/
/**
\file
Ethernet over EtherCAT (EoE).
*/
/*****************************************************************************/
#include <linux/version.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include "globals.h"
#include "master.h"
#include "slave.h"
#include "mailbox.h"
#include "ethernet.h"
/*****************************************************************************/
/** Defines the debug level of EoE processing.
*
* 0 = No debug messages.
* 1 = Output warnings.
* 2 = Output actions.
* 3 = Output actions and frame data.
*/
#define EOE_DEBUG_LEVEL 1
/** Size of the EoE tx queue.
*/
#define EC_EOE_TX_QUEUE_SIZE 100
/** Number of tries.
*/
#define EC_EOE_TRIES 100
/*****************************************************************************/
void ec_eoe_flush(ec_eoe_t *);
// state functions
void ec_eoe_state_rx_start(ec_eoe_t *);
void ec_eoe_state_rx_check(ec_eoe_t *);
void ec_eoe_state_rx_fetch(ec_eoe_t *);
void ec_eoe_state_tx_start(ec_eoe_t *);
void ec_eoe_state_tx_sent(ec_eoe_t *);
// net_device functions
int ec_eoedev_open(struct net_device *);
int ec_eoedev_stop(struct net_device *);
int ec_eoedev_tx(struct sk_buff *, struct net_device *);
struct net_device_stats *ec_eoedev_stats(struct net_device *);
/*****************************************************************************/
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29)
/** Device operations for EoE interfaces.
*/
static const struct net_device_ops ec_eoedev_ops = {
.ndo_open = ec_eoedev_open,
.ndo_stop = ec_eoedev_stop,
.ndo_start_xmit = ec_eoedev_tx,
.ndo_get_stats = ec_eoedev_stats,
};
#endif
/*****************************************************************************/
/** EoE constructor.
*
* Initializes the EoE handler, creates a net_device and registers it.
*
* \return Zero on success, otherwise a negative error code.
*/
int ec_eoe_init(
ec_eoe_t *eoe, /**< EoE handler */
ec_slave_t *slave /**< EtherCAT slave */
)
{
ec_eoe_t **priv;
int i, ret = 0;
char name[EC_DATAGRAM_NAME_SIZE];
eoe->slave = slave;
ec_datagram_init(&eoe->datagram);
eoe->queue_datagram = 0;
eoe->state = ec_eoe_state_rx_start;
eoe->opened = 0;
eoe->rx_skb = NULL;
eoe->rx_expected_fragment = 0;
INIT_LIST_HEAD(&eoe->tx_queue);
eoe->tx_frame = NULL;
eoe->tx_queue_active = 0;
eoe->tx_queue_size = EC_EOE_TX_QUEUE_SIZE;
eoe->tx_queued_frames = 0;
sema_init(&eoe->tx_queue_sem, 1);
eoe->tx_frame_number = 0xFF;
memset(&eoe->stats, 0, sizeof(struct net_device_stats));
eoe->rx_counter = 0;
eoe->tx_counter = 0;
eoe->rx_rate = 0;
eoe->tx_rate = 0;
eoe->rate_jiffies = 0;
eoe->rx_idle = 1;
eoe->tx_idle = 1;
/* device name eoe<MASTER>[as]<SLAVE>, because networking scripts don't
* like hyphens etc. in interface names. */
if (slave->effective_alias) {
snprintf(name, EC_DATAGRAM_NAME_SIZE,
"eoe%ua%u", slave->master->index, slave->effective_alias);
} else {
snprintf(name, EC_DATAGRAM_NAME_SIZE,
"eoe%us%u", slave->master->index, slave->ring_position);
}
snprintf(eoe->datagram.name, EC_DATAGRAM_NAME_SIZE, name);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 17, 0)
eoe->dev = alloc_netdev(sizeof(ec_eoe_t *), name, NET_NAME_UNKNOWN,
ether_setup);
#else
eoe->dev = alloc_netdev(sizeof(ec_eoe_t *), name, ether_setup);
#endif
if (!eoe->dev) {
EC_SLAVE_ERR(slave, "Unable to allocate net_device %s"
" for EoE handler!\n", name);
ret = -ENODEV;
goto out_return;
}
// initialize net_device
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29)
eoe->dev->netdev_ops = &ec_eoedev_ops;
#else
eoe->dev->open = ec_eoedev_open;
eoe->dev->stop = ec_eoedev_stop;
eoe->dev->hard_start_xmit = ec_eoedev_tx;
eoe->dev->get_stats = ec_eoedev_stats;
#endif
for (i = 0; i < ETH_ALEN; i++)
eoe->dev->dev_addr[i] = i | (i << 4);
// initialize private data
priv = netdev_priv(eoe->dev);
*priv = eoe;
// Usually setting the MTU appropriately makes the upper layers
// do the frame fragmenting. In some cases this doesn't work
// so the MTU is left on the Ethernet standard value and fragmenting
// is done "manually".
#if 0
eoe->dev->mtu = slave->configured_rx_mailbox_size - ETH_HLEN - 10;
#endif
// connect the net_device to the kernel
ret = register_netdev(eoe->dev);
if (ret) {
EC_SLAVE_ERR(slave, "Unable to register net_device:"
" error %i\n", ret);
goto out_free;
}
// make the last address octet unique
eoe->dev->dev_addr[ETH_ALEN - 1] = (uint8_t) eoe->dev->ifindex;
return 0;
out_free:
free_netdev(eoe->dev);
eoe->dev = NULL;
out_return:
return ret;
}
/*****************************************************************************/
/** EoE destructor.
*
* Unregisteres the net_device and frees allocated memory.
*/
void ec_eoe_clear(ec_eoe_t *eoe /**< EoE handler */)
{
unregister_netdev(eoe->dev); // possibly calls close callback
// empty transmit queue
ec_eoe_flush(eoe);
if (eoe->tx_frame) {
dev_kfree_skb(eoe->tx_frame->skb);
kfree(eoe->tx_frame);
}
if (eoe->rx_skb)
dev_kfree_skb(eoe->rx_skb);
free_netdev(eoe->dev);
ec_datagram_clear(&eoe->datagram);
}
/*****************************************************************************/
/** Empties the transmit queue.
*/
void ec_eoe_flush(ec_eoe_t *eoe /**< EoE handler */)
{
ec_eoe_frame_t *frame, *next;
down(&eoe->tx_queue_sem);
list_for_each_entry_safe(frame, next, &eoe->tx_queue, queue) {
list_del(&frame->queue);
dev_kfree_skb(frame->skb);
kfree(frame);
}
eoe->tx_queued_frames = 0;
up(&eoe->tx_queue_sem);
}
/*****************************************************************************/
/** Sends a frame or the next fragment.
*
* \return Zero on success, otherwise a negative error code.
*/
int ec_eoe_send(ec_eoe_t *eoe /**< EoE handler */)
{
size_t remaining_size, current_size, complete_offset;
unsigned int last_fragment;
uint8_t *data;
#if EOE_DEBUG_LEVEL >= 3
unsigned int i;
#endif
remaining_size = eoe->tx_frame->skb->len - eoe->tx_offset;
if (remaining_size <= eoe->slave->configured_tx_mailbox_size - 10) {
current_size = remaining_size;
last_fragment = 1;
} else {
current_size = ((eoe->slave->configured_tx_mailbox_size - 10) / 32) * 32;
last_fragment = 0;
}
if (eoe->tx_fragment_number) {
complete_offset = eoe->tx_offset / 32;
}
else {
// complete size in 32 bit blocks, rounded up.
complete_offset = remaining_size / 32 + 1;
}
#if EOE_DEBUG_LEVEL >= 2
EC_SLAVE_DBG(slave, 0, "EoE %s TX sending fragment %u%s"
" with %u octets (%u). %u frames queued.\n",
eoe->dev->name, eoe->tx_fragment_number,
last_fragment ? "" : "+", current_size, complete_offset,
eoe->tx_queued_frames);
#endif
#if EOE_DEBUG_LEVEL >= 3
EC_SLAVE_DBG(master, 0, "");
for (i = 0; i < current_size; i++) {
printk("%02X ", eoe->tx_frame->skb->data[eoe->tx_offset + i]);
if ((i + 1) % 16 == 0) {
printk("\n");
EC_SLAVE_DBG(master, 0, "");
}
}
printk("\n");
#endif
data = ec_slave_mbox_prepare_send(eoe->slave, &eoe->datagram,
0x02, current_size + 4);
if (IS_ERR(data))
return PTR_ERR(data);
EC_WRITE_U8 (data, 0x00); // eoe fragment req.
EC_WRITE_U8 (data + 1, last_fragment);
EC_WRITE_U16(data + 2, ((eoe->tx_fragment_number & 0x3F) |
(complete_offset & 0x3F) << 6 |
(eoe->tx_frame_number & 0x0F) << 12));
memcpy(data + 4, eoe->tx_frame->skb->data + eoe->tx_offset, current_size);
eoe->queue_datagram = 1;
eoe->tx_offset += current_size;
eoe->tx_fragment_number++;
return 0;
}
/*****************************************************************************/
/** Runs the EoE state machine.
*/
void ec_eoe_run(ec_eoe_t *eoe /**< EoE handler */)
{
if (!eoe->opened)
return;
// if the datagram was not sent, or is not yet received, skip this cycle
if (eoe->queue_datagram || eoe->datagram.state == EC_DATAGRAM_SENT)
return;
// call state function
eoe->state(eoe);
// update statistics
if (jiffies - eoe->rate_jiffies > HZ) {
eoe->rx_rate = eoe->rx_counter;
eoe->tx_rate = eoe->tx_counter;
eoe->rx_counter = 0;
eoe->tx_counter = 0;
eoe->rate_jiffies = jiffies;
}
ec_datagram_output_stats(&eoe->datagram);
}
/*****************************************************************************/
/** Queues the datagram, if necessary.
*/
void ec_eoe_queue(ec_eoe_t *eoe /**< EoE handler */)
{
if (eoe->queue_datagram) {
ec_master_queue_datagram_ext(eoe->slave->master, &eoe->datagram);
eoe->queue_datagram = 0;
}
}
/*****************************************************************************/
/** Returns the state of the device.
*
* \return 1 if the device is "up", 0 if it is "down"
*/
int ec_eoe_is_open(const ec_eoe_t *eoe /**< EoE handler */)
{
return eoe->opened;
}
/*****************************************************************************/
/** Returns the idle state.
*
* \retval 1 The device is idle.
* \retval 0 The device is busy.
*/
int ec_eoe_is_idle(const ec_eoe_t *eoe /**< EoE handler */)
{
return eoe->rx_idle && eoe->tx_idle;
}
/******************************************************************************
* STATE PROCESSING FUNCTIONS
*****************************************************************************/
/** State: RX_START.
*
* Starts a new receiving sequence by queueing a datagram that checks the
* slave's mailbox for a new EoE datagram.
*
* \todo Use both devices.
*/
void ec_eoe_state_rx_start(ec_eoe_t *eoe /**< EoE handler */)
{
if (eoe->slave->error_flag ||
!eoe->slave->master->devices[EC_DEVICE_MAIN].link_state) {
eoe->rx_idle = 1;
eoe->tx_idle = 1;
return;
}
ec_slave_mbox_prepare_check(eoe->slave, &eoe->datagram);
eoe->queue_datagram = 1;
eoe->state = ec_eoe_state_rx_check;
}
/*****************************************************************************/
/** State: RX_CHECK.
*
* Processes the checking datagram sent in RX_START and issues a receive
* datagram, if new data is available.
*/
void ec_eoe_state_rx_check(ec_eoe_t *eoe /**< EoE handler */)
{
if (eoe->datagram.state != EC_DATAGRAM_RECEIVED) {
eoe->stats.rx_errors++;
#if EOE_DEBUG_LEVEL >= 1
EC_SLAVE_WARN(eoe->slave, "Failed to receive mbox"
" check datagram for %s.\n", eoe->dev->name);
#endif
eoe->state = ec_eoe_state_tx_start;
return;
}
if (!ec_slave_mbox_check(&eoe->datagram)) {
eoe->rx_idle = 1;
eoe->state = ec_eoe_state_tx_start;
return;
}
eoe->rx_idle = 0;
ec_slave_mbox_prepare_fetch(eoe->slave, &eoe->datagram);
eoe->queue_datagram = 1;
eoe->state = ec_eoe_state_rx_fetch;
}
/*****************************************************************************/
/** State: RX_FETCH.
*
* Checks if the requested data of RX_CHECK was received and processes the EoE
* datagram.
*/
void ec_eoe_state_rx_fetch(ec_eoe_t *eoe /**< EoE handler */)
{
size_t rec_size, data_size;
uint8_t *data, frame_type, last_fragment, time_appended, mbox_prot;
uint8_t fragment_offset, fragment_number;
#if EOE_DEBUG_LEVEL >= 2
uint8_t frame_number;
#endif
off_t offset;
#if EOE_DEBUG_LEVEL >= 3
unsigned int i;
#endif
if (eoe->datagram.state != EC_DATAGRAM_RECEIVED) {
eoe->stats.rx_errors++;
#if EOE_DEBUG_LEVEL >= 1
EC_SLAVE_WARN(eoe->slave, "Failed to receive mbox"
" fetch datagram for %s.\n", eoe->dev->name);
#endif
eoe->state = ec_eoe_state_tx_start;
return;
}
data = ec_slave_mbox_fetch(eoe->slave, &eoe->datagram,
&mbox_prot, &rec_size);
if (IS_ERR(data)) {
eoe->stats.rx_errors++;
#if EOE_DEBUG_LEVEL >= 1
EC_SLAVE_WARN(eoe->slave, "Invalid mailbox response for %s.\n",
eoe->dev->name);
#endif
eoe->state = ec_eoe_state_tx_start;
return;
}
if (mbox_prot != 0x02) { // EoE FIXME mailbox handler necessary
eoe->stats.rx_errors++;
#if EOE_DEBUG_LEVEL >= 1
EC_SLAVE_WARN(eoe->slave, "Other mailbox protocol response for %s.\n",
eoe->dev->name);
#endif
eoe->state = ec_eoe_state_tx_start;
return;
}
frame_type = EC_READ_U16(data) & 0x000F;
if (frame_type != 0x00) {
#if EOE_DEBUG_LEVEL >= 1
EC_SLAVE_WARN(eoe->slave, "%s: Other frame received."
" Dropping.\n", eoe->dev->name);
#endif
eoe->stats.rx_dropped++;
eoe->state = ec_eoe_state_tx_start;
return;
}
// EoE Fragment Request received
last_fragment = (EC_READ_U16(data) >> 8) & 0x0001;
time_appended = (EC_READ_U16(data) >> 9) & 0x0001;
fragment_number = EC_READ_U16(data + 2) & 0x003F;
fragment_offset = (EC_READ_U16(data + 2) >> 6) & 0x003F;
#if EOE_DEBUG_LEVEL >= 2
frame_number = (EC_READ_U16(data + 2) >> 12) & 0x000F;
#endif
#if EOE_DEBUG_LEVEL >= 2
EC_SLAVE_DBG(eoe->slave, 0, "EoE %s RX fragment %u%s, offset %u,"
" frame %u%s, %u octets\n", eoe->dev->name, fragment_number,
last_fragment ? "" : "+", fragment_offset, frame_number,
time_appended ? ", + timestamp" : "",
time_appended ? rec_size - 8 : rec_size - 4);
#endif
#if EOE_DEBUG_LEVEL >= 3
EC_SLAVE_DBG(eoe->slave, 0, "");
for (i = 0; i < rec_size - 4; i++) {
printk("%02X ", data[i + 4]);
if ((i + 1) % 16 == 0) {
printk("\n");
EC_SLAVE_DBG(eoe->slave, 0, "");
}
}
printk("\n");
#endif
data_size = time_appended ? rec_size - 8 : rec_size - 4;
if (!fragment_number) {
if (eoe->rx_skb) {
EC_SLAVE_WARN(eoe->slave, "EoE RX freeing old socket buffer.\n");
dev_kfree_skb(eoe->rx_skb);
}
// new socket buffer
if (!(eoe->rx_skb = dev_alloc_skb(fragment_offset * 32))) {
if (printk_ratelimit())
EC_SLAVE_WARN(eoe->slave, "EoE RX low on mem,"
" frame dropped.\n");
eoe->stats.rx_dropped++;
eoe->state = ec_eoe_state_tx_start;
return;
}
eoe->rx_skb_offset = 0;
eoe->rx_skb_size = fragment_offset * 32;
eoe->rx_expected_fragment = 0;
}
else {
if (!eoe->rx_skb) {
eoe->stats.rx_dropped++;
eoe->state = ec_eoe_state_tx_start;
return;
}
offset = fragment_offset * 32;
if (offset != eoe->rx_skb_offset ||
offset + data_size > eoe->rx_skb_size ||
fragment_number != eoe->rx_expected_fragment) {
dev_kfree_skb(eoe->rx_skb);
eoe->rx_skb = NULL;
eoe->stats.rx_errors++;
#if EOE_DEBUG_LEVEL >= 1
EC_SLAVE_WARN(eoe->slave, "Fragmenting error at %s.\n",
eoe->dev->name);
#endif
eoe->state = ec_eoe_state_tx_start;
return;
}
}
// copy fragment into socket buffer
memcpy(skb_put(eoe->rx_skb, data_size), data + 4, data_size);
eoe->rx_skb_offset += data_size;
if (last_fragment) {
// update statistics
eoe->stats.rx_packets++;
eoe->stats.rx_bytes += eoe->rx_skb->len;
eoe->rx_counter += eoe->rx_skb->len;
#if EOE_DEBUG_LEVEL >= 2
EC_SLAVE_DBG(eoe->slave, 0, "EoE %s RX frame completed"
" with %u octets.\n", eoe->dev->name, eoe->rx_skb->len);
#endif
// pass socket buffer to network stack
eoe->rx_skb->dev = eoe->dev;
eoe->rx_skb->protocol = eth_type_trans(eoe->rx_skb, eoe->dev);
eoe->rx_skb->ip_summed = CHECKSUM_UNNECESSARY;
if (netif_rx(eoe->rx_skb)) {
EC_SLAVE_WARN(eoe->slave, "EoE RX netif_rx failed.\n");
}
eoe->rx_skb = NULL;
eoe->state = ec_eoe_state_tx_start;
}
else {
eoe->rx_expected_fragment++;
#if EOE_DEBUG_LEVEL >= 2
EC_SLAVE_DBG(eoe->slave, 0, "EoE %s RX expecting fragment %u\n",
eoe->dev->name, eoe->rx_expected_fragment);
#endif
eoe->state = ec_eoe_state_rx_start;
}
}
/*****************************************************************************/
/** State: TX START.
*
* Starts a new transmit sequence. If no data is available, a new receive
* sequence is started instead.
*
* \todo Use both devices.
*/
void ec_eoe_state_tx_start(ec_eoe_t *eoe /**< EoE handler */)
{
#if EOE_DEBUG_LEVEL >= 2
unsigned int wakeup = 0;
#endif
if (eoe->slave->error_flag ||
!eoe->slave->master->devices[EC_DEVICE_MAIN].link_state) {
eoe->rx_idle = 1;
eoe->tx_idle = 1;
return;
}
down(&eoe->tx_queue_sem);
if (!eoe->tx_queued_frames || list_empty(&eoe->tx_queue)) {
up(&eoe->tx_queue_sem);
eoe->tx_idle = 1;
// no data available.
// start a new receive immediately.
ec_eoe_state_rx_start(eoe);
return;
}
// take the first frame out of the queue
eoe->tx_frame = list_entry(eoe->tx_queue.next, ec_eoe_frame_t, queue);
list_del(&eoe->tx_frame->queue);
if (!eoe->tx_queue_active &&
eoe->tx_queued_frames == eoe->tx_queue_size / 2) {
netif_wake_queue(eoe->dev);
eoe->tx_queue_active = 1;
#if EOE_DEBUG_LEVEL >= 2
wakeup = 1;
#endif
}
eoe->tx_queued_frames--;
up(&eoe->tx_queue_sem);
eoe->tx_idle = 0;
eoe->tx_frame_number++;
eoe->tx_frame_number %= 16;
eoe->tx_fragment_number = 0;
eoe->tx_offset = 0;
if (ec_eoe_send(eoe)) {
dev_kfree_skb(eoe->tx_frame->skb);
kfree(eoe->tx_frame);
eoe->tx_frame = NULL;
eoe->stats.tx_errors++;
eoe->state = ec_eoe_state_rx_start;
#if EOE_DEBUG_LEVEL >= 1
EC_SLAVE_WARN(eoe->slave, "Send error at %s.\n", eoe->dev->name);
#endif
return;
}
#if EOE_DEBUG_LEVEL >= 2
if (wakeup)
EC_SLAVE_DBG(eoe->slave, 0, "EoE %s waking up TX queue...\n",
eoe->dev->name);
#endif
eoe->tries = EC_EOE_TRIES;
eoe->state = ec_eoe_state_tx_sent;
}
/*****************************************************************************/
/** State: TX SENT.
*
* Checks is the previous transmit datagram succeded and sends the next
* fragment, if necessary.
*/
void ec_eoe_state_tx_sent(ec_eoe_t *eoe /**< EoE handler */)
{
if (eoe->datagram.state != EC_DATAGRAM_RECEIVED) {
if (eoe->tries) {
eoe->tries--; // try again
eoe->queue_datagram = 1;
} else {
eoe->stats.tx_errors++;
#if EOE_DEBUG_LEVEL >= 1
EC_SLAVE_WARN(eoe->slave, "Failed to receive send"
" datagram for %s after %u tries.\n",
eoe->dev->name, EC_EOE_TRIES);
#endif
eoe->state = ec_eoe_state_rx_start;
}
return;
}
if (eoe->datagram.working_counter != 1) {
if (eoe->tries) {
eoe->tries--; // try again
eoe->queue_datagram = 1;
} else {
eoe->stats.tx_errors++;
#if EOE_DEBUG_LEVEL >= 1
EC_SLAVE_WARN(eoe->slave, "No sending response"
" for %s after %u tries.\n",
eoe->dev->name, EC_EOE_TRIES);
#endif
eoe->state = ec_eoe_state_rx_start;
}
return;
}
// frame completely sent
if (eoe->tx_offset >= eoe->tx_frame->skb->len) {
eoe->stats.tx_packets++;
eoe->stats.tx_bytes += eoe->tx_frame->skb->len;
eoe->tx_counter += eoe->tx_frame->skb->len;
dev_kfree_skb(eoe->tx_frame->skb);
kfree(eoe->tx_frame);
eoe->tx_frame = NULL;
eoe->state = ec_eoe_state_rx_start;
}
else { // send next fragment
if (ec_eoe_send(eoe)) {
dev_kfree_skb(eoe->tx_frame->skb);
kfree(eoe->tx_frame);
eoe->tx_frame = NULL;
eoe->stats.tx_errors++;
#if EOE_DEBUG_LEVEL >= 1
EC_SLAVE_WARN(eoe->slave, "Send error at %s.\n", eoe->dev->name);
#endif
eoe->state = ec_eoe_state_rx_start;
}
}
}
/******************************************************************************
* NET_DEVICE functions
*****************************************************************************/
/** Opens the virtual network device.
*
* \return Always zero (success).
*/
int ec_eoedev_open(struct net_device *dev /**< EoE net_device */)
{
ec_eoe_t *eoe = *((ec_eoe_t **) netdev_priv(dev));
ec_eoe_flush(eoe);
eoe->opened = 1;
eoe->rx_idle = 0;
eoe->tx_idle = 0;
netif_start_queue(dev);
eoe->tx_queue_active = 1;
#if EOE_DEBUG_LEVEL >= 2
EC_SLAVE_DBG(eoe->slave, 0, "%s opened.\n", dev->name);
#endif
ec_slave_request_state(eoe->slave, EC_SLAVE_STATE_OP);
return 0;
}
/*****************************************************************************/
/** Stops the virtual network device.
*
* \return Always zero (success).
*/
int ec_eoedev_stop(struct net_device *dev /**< EoE net_device */)
{
ec_eoe_t *eoe = *((ec_eoe_t **) netdev_priv(dev));
netif_stop_queue(dev);
eoe->rx_idle = 1;
eoe->tx_idle = 1;
eoe->tx_queue_active = 0;
eoe->opened = 0;
ec_eoe_flush(eoe);
#if EOE_DEBUG_LEVEL >= 2
EC_SLAVE_DBG(eoe->slave, 0, "%s stopped.\n", dev->name);
#endif
ec_slave_request_state(eoe->slave, EC_SLAVE_STATE_PREOP);
return 0;
}
/*****************************************************************************/
/** Transmits data via the virtual network device.
*
* \return Zero on success, non-zero on failure.
*/
int ec_eoedev_tx(struct sk_buff *skb, /**< transmit socket buffer */
struct net_device *dev /**< EoE net_device */
)
{
ec_eoe_t *eoe = *((ec_eoe_t **) netdev_priv(dev));
ec_eoe_frame_t *frame;
#if 0
if (skb->len > eoe->slave->configured_tx_mailbox_size - 10) {
EC_SLAVE_WARN(eoe->slave, "EoE TX frame (%u octets)"
" exceeds MTU. dropping.\n", skb->len);
dev_kfree_skb(skb);
eoe->stats.tx_dropped++;
return 0;
}
#endif
if (!(frame =
(ec_eoe_frame_t *) kmalloc(sizeof(ec_eoe_frame_t), GFP_ATOMIC))) {
if (printk_ratelimit())
EC_SLAVE_WARN(eoe->slave, "EoE TX: low on mem. frame dropped.\n");
return 1;
}
frame->skb = skb;
down(&eoe->tx_queue_sem);
list_add_tail(&frame->queue, &eoe->tx_queue);
eoe->tx_queued_frames++;
if (eoe->tx_queued_frames == eoe->tx_queue_size) {
netif_stop_queue(dev);
eoe->tx_queue_active = 0;
}
up(&eoe->tx_queue_sem);
#if EOE_DEBUG_LEVEL >= 2
EC_SLAVE_DBG(eoe->slave, 0, "EoE %s TX queued frame"
" with %u octets (%u frames queued).\n",
eoe->dev->name, skb->len, eoe->tx_queued_frames);
if (!eoe->tx_queue_active)
EC_SLAVE_WARN(eoe->slave, "EoE TX queue is now full.\n");
#endif
return 0;
}
/*****************************************************************************/
/** Gets statistics about the virtual network device.
*
* \return Statistics.
*/
struct net_device_stats *ec_eoedev_stats(
struct net_device *dev /**< EoE net_device */
)
{
ec_eoe_t *eoe = *((ec_eoe_t **) netdev_priv(dev));
return &eoe->stats;
}
/*****************************************************************************/