fp@145: /******************************************************************************
fp@145:  *
fp@145:  *  $Id$
fp@145:  *
fp@1618:  *  Copyright (C) 2006  Florian Pose, Ingenieurgemeinschaft IgH
fp@1618:  *
fp@1618:  *  This file is part of the IgH EtherCAT Master.
fp@1618:  *
fp@1618:  *  The IgH EtherCAT Master is free software; you can redistribute it
fp@1618:  *  and/or modify it under the terms of the GNU General Public License
fp@1619:  *  as published by the Free Software Foundation; either version 2 of the
fp@1619:  *  License, or (at your option) any later version.
fp@1618:  *
fp@1618:  *  The IgH EtherCAT Master is distributed in the hope that it will be
fp@1618:  *  useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
fp@1618:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
fp@1618:  *  GNU General Public License for more details.
fp@1618:  *
fp@1618:  *  You should have received a copy of the GNU General Public License
fp@1618:  *  along with the IgH EtherCAT Master; if not, write to the Free Software
fp@1618:  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
fp@1618:  *
fp@1619:  *  The right to use EtherCAT Technology is granted and comes free of
fp@1619:  *  charge under condition of compatibility of product made by
fp@1619:  *  Licensee. People intending to distribute/sell products based on the
fp@1619:  *  code, have to sign an agreement to guarantee that products using
fp@1619:  *  software based on IgH EtherCAT master stay compatible with the actual
fp@1619:  *  EtherCAT specification (which are released themselves as an open
fp@1619:  *  standard) as the (only) precondition to have the right to use EtherCAT
fp@1619:  *  Technology, IP and trade marks.
fp@1619:  *
fp@145:  *****************************************************************************/
fp@145: 
fp@1618: /**
fp@1618:    \file
fp@1618:    Ethernet-over-EtherCAT (EoE).
fp@1618: */
fp@1618: 
fp@1618: /*****************************************************************************/
fp@1618: 
fp@1624: #include <linux/netdevice.h>
fp@1619: #include <linux/etherdevice.h>
fp@1619: 
fp@145: #include "../include/ecrt.h"
fp@145: #include "globals.h"
fp@145: #include "master.h"
fp@145: #include "slave.h"
fp@145: #include "mailbox.h"
fp@145: #include "ethernet.h"
fp@145: 
fp@1623: /**
fp@1623:    Defines the debug level of EoE processing
fp@1623: 
fp@1623:    0 = No debug messages.
fp@1623:    1 = Output actions.
fp@1623:    2 = Output actions and frame data.
fp@1623: */
fp@1623: 
fp@1619: #define EOE_DEBUG_LEVEL 0
fp@1619: 
fp@1619: /*****************************************************************************/
fp@1619: 
fp@1619: void ec_eoe_flush(ec_eoe_t *);
fp@1619: 
fp@1619: // state functions
fp@1619: void ec_eoe_state_rx_start(ec_eoe_t *);
fp@1619: void ec_eoe_state_rx_check(ec_eoe_t *);
fp@1619: void ec_eoe_state_rx_fetch(ec_eoe_t *);
fp@1619: void ec_eoe_state_tx_start(ec_eoe_t *);
fp@1619: void ec_eoe_state_tx_sent(ec_eoe_t *);
fp@1619: 
fp@1619: // net_device functions
fp@1619: int ec_eoedev_open(struct net_device *);
fp@1619: int ec_eoedev_stop(struct net_device *);
fp@1619: int ec_eoedev_tx(struct sk_buff *, struct net_device *);
fp@1619: struct net_device_stats *ec_eoedev_stats(struct net_device *);
fp@1619: 
fp@145: /*****************************************************************************/
fp@145: 
fp@1618: /**
fp@1618:    EoE constructor.
fp@1619:    Initializes the EoE handler, creates a net_device and registeres it.
fp@1619: */
fp@1619: 
fp@1619: int ec_eoe_init(ec_eoe_t *eoe /**< EoE handler */)
fp@1619: {
fp@1619:     ec_eoe_t **priv;
fp@1619:     int result, i;
fp@1619: 
fp@1619:     eoe->slave = NULL;
fp@1624:     ec_datagram_init(&eoe->datagram);
fp@1619:     eoe->state = ec_eoe_state_rx_start;
fp@1619:     eoe->opened = 0;
fp@1619:     eoe->rx_skb = NULL;
fp@1619:     eoe->rx_expected_fragment = 0;
fp@1619:     INIT_LIST_HEAD(&eoe->tx_queue);
fp@1619:     eoe->tx_frame = NULL;
fp@1619:     eoe->tx_queue_active = 0;
fp@1619:     eoe->tx_queued_frames = 0;
fp@1619:     eoe->tx_queue_lock = SPIN_LOCK_UNLOCKED;
fp@1619:     eoe->tx_frame_number = 0xFF;
fp@1619:     memset(&eoe->stats, 0, sizeof(struct net_device_stats));
fp@1619: 
fp@1619:     if (!(eoe->dev =
fp@1619:           alloc_netdev(sizeof(ec_eoe_t *), "eoe%d", ether_setup))) {
fp@1619:         EC_ERR("Unable to allocate net_device for EoE handler!\n");
fp@1619:         goto out_return;
fp@1619:     }
fp@1619: 
fp@1619:     // initialize net_device
fp@1619:     eoe->dev->open = ec_eoedev_open;
fp@1619:     eoe->dev->stop = ec_eoedev_stop;
fp@1619:     eoe->dev->hard_start_xmit = ec_eoedev_tx;
fp@1619:     eoe->dev->get_stats = ec_eoedev_stats;
fp@1619: 
fp@1619:     for (i = 0; i < ETH_ALEN; i++)
fp@1619:         eoe->dev->dev_addr[i] = i | (i << 4);
fp@1619: 
fp@1619:     // initialize private data
fp@1619:     priv = netdev_priv(eoe->dev);
fp@1619:     *priv = eoe;
fp@1619: 
fp@1619:     // Usually setting the MTU appropriately makes the upper layers
fp@1619:     // do the frame fragmenting. In some cases this doesn't work
fp@1619:     // so the MTU is left on the Ethernet standard value and fragmenting
fp@1619:     // is done "manually".
fp@1619: #if 0
fp@1619:     eoe->dev->mtu = slave->sii_rx_mailbox_size - ETH_HLEN - 10;
fp@1619: #endif
fp@1619: 
fp@1619:     // connect the net_device to the kernel
fp@1619:     if ((result = register_netdev(eoe->dev))) {
fp@1619:         EC_ERR("Unable to register net_device: error %i\n", result);
fp@1619:         goto out_free;
fp@1619:     }
fp@1619: 
fp@1619:     // make the last address octet unique
fp@1619:     eoe->dev->dev_addr[ETH_ALEN - 1] = (uint8_t) eoe->dev->ifindex;
fp@1619: 
fp@1619:     return 0;
fp@1619: 
fp@1619:  out_free:
fp@1619:     free_netdev(eoe->dev);
fp@1619:     eoe->dev = NULL;
fp@1619:  out_return:
fp@1619:     return -1;
fp@145: }
fp@145: 
fp@145: /*****************************************************************************/
fp@145: 
fp@1618: /**
fp@1618:    EoE destructor.
fp@1619:    Unregisteres the net_device and frees allocated memory.
fp@1619: */
fp@1619: 
fp@1619: void ec_eoe_clear(ec_eoe_t *eoe /**< EoE handler */)
fp@1619: {
fp@1624:     if (eoe->dev) { // TODO: dev never NULL?
fp@1619:         unregister_netdev(eoe->dev);
fp@1619:         free_netdev(eoe->dev);
fp@1619:     }
fp@1619: 
fp@1619:     // empty transmit queue
fp@1619:     ec_eoe_flush(eoe);
fp@1619: 
fp@1619:     if (eoe->tx_frame) {
fp@1619:         dev_kfree_skb(eoe->tx_frame->skb);
fp@1619:         kfree(eoe->tx_frame);
fp@1619:     }
fp@1619: 
fp@1619:     if (eoe->rx_skb) dev_kfree_skb(eoe->rx_skb);
fp@1621: 
fp@1624:     ec_datagram_clear(&eoe->datagram);
fp@1619: }
fp@1619: 
fp@1619: /*****************************************************************************/
fp@1619: 
fp@1619: /**
fp@1619:    Empties the transmit queue.
fp@1619: */
fp@1619: 
fp@1619: void ec_eoe_flush(ec_eoe_t *eoe /**< EoE handler */)
fp@1619: {
fp@1619:     ec_eoe_frame_t *frame, *next;
fp@1619: 
fp@1619:     spin_lock_bh(&eoe->tx_queue_lock);
fp@1619: 
fp@1619:     list_for_each_entry_safe(frame, next, &eoe->tx_queue, queue) {
fp@1619:         list_del(&frame->queue);
fp@1619:         dev_kfree_skb(frame->skb);
fp@1619:         kfree(frame);
fp@1619:     }
fp@1619:     eoe->tx_queued_frames = 0;
fp@1619: 
fp@1619:     spin_unlock_bh(&eoe->tx_queue_lock);
fp@1619: }
fp@1619: 
fp@1619: /*****************************************************************************/
fp@1619: 
fp@1619: /**
fp@1619:    Sends a frame or the next fragment.
fp@1619: */
fp@1619: 
fp@1619: int ec_eoe_send(ec_eoe_t *eoe /**< EoE handler */)
fp@1619: {
fp@1619:     size_t remaining_size, current_size, complete_offset;
fp@1619:     unsigned int last_fragment;
fp@1619:     uint8_t *data;
fp@1619: #if EOE_DEBUG_LEVEL > 1
fp@1619:     unsigned int i;
fp@1619: #endif
fp@1619: 
fp@1619:     remaining_size = eoe->tx_frame->skb->len - eoe->tx_offset;
fp@1619: 
fp@1619:     if (remaining_size <= eoe->slave->sii_tx_mailbox_size - 10) {
fp@1619:         current_size = remaining_size;
fp@1619:         last_fragment = 1;
fp@1619:     }
fp@1619:     else {
fp@1619:         current_size = ((eoe->slave->sii_tx_mailbox_size - 10) / 32) * 32;
fp@1619:         last_fragment = 0;
fp@1619:     }
fp@1619: 
fp@1619:     if (eoe->tx_fragment_number) {
fp@1619:         complete_offset = eoe->tx_offset / 32;
fp@1619:     }
fp@1619:     else {
fp@1624:         // complete size in 32 bit blocks, rounded up.
fp@1619:         complete_offset = remaining_size / 32 + 1;
fp@1619:     }
fp@1619: 
fp@1619: #if EOE_DEBUG_LEVEL > 0
fp@1619:     EC_DBG("EoE TX sending %sfragment %i with %i octets (%i)."
fp@1619:            " %i frames queued.\n", last_fragment ? "last " : "",
fp@1619:            eoe->tx_fragment_number, current_size, complete_offset,
fp@1619:            eoe->tx_queued_frames);
fp@1619: #endif
fp@1619: 
fp@1619: #if EOE_DEBUG_LEVEL > 1
fp@1619:     EC_DBG("");
fp@1619:     for (i = 0; i < current_size; i++) {
fp@1619:         printk("%02X ", frame->skb->data[eoe->tx_offset + i]);
fp@1619:         if ((i + 1) % 16 == 0) {
fp@1619:             printk("\n");
fp@1619:             EC_DBG("");
fp@1619:         }
fp@1619:     }
fp@1619:     printk("\n");
fp@1619: #endif
fp@1619: 
fp@1624:     if (!(data = ec_slave_mbox_prepare_send(eoe->slave, &eoe->datagram,
fp@1621:                                             0x02, current_size + 4)))
fp@1619:         return -1;
fp@1619: 
fp@1619:     EC_WRITE_U8 (data,     0x00); // eoe fragment req.
fp@1619:     EC_WRITE_U8 (data + 1, last_fragment);
fp@1619:     EC_WRITE_U16(data + 2, ((eoe->tx_fragment_number & 0x3F) |
fp@1619:                             (complete_offset & 0x3F) << 6 |
fp@1619:                             (eoe->tx_frame_number & 0x0F) << 12));
fp@1619: 
fp@1619:     memcpy(data + 4, eoe->tx_frame->skb->data + eoe->tx_offset, current_size);
fp@1624:     ec_master_queue_datagram(eoe->slave->master, &eoe->datagram);
fp@1619: 
fp@1619:     eoe->tx_offset += current_size;
fp@1619:     eoe->tx_fragment_number++;
fp@1619:     return 0;
fp@145: }
fp@145: 
fp@145: /*****************************************************************************/
fp@145: 
fp@1618: /**
fp@1618:    Runs the EoE state machine.
fp@1618: */
fp@1618: 
fp@1619: void ec_eoe_run(ec_eoe_t *eoe /**< EoE handler */)
fp@1619: {
fp@1619:     if (!eoe->opened) return;
fp@1619: 
fp@1619:     // call state function
fp@1619:     eoe->state(eoe);
fp@1619: }
fp@1619: 
fp@1619: /*****************************************************************************/
fp@1619: 
fp@1619: /**
fp@1619:    Returns the state of the device.
fp@1619:    \return 1 if the device is "up", 0 if it is "down"
fp@1619: */
fp@1619: 
fp@1619: unsigned int ec_eoe_active(const ec_eoe_t *eoe /**< EoE handler */)
fp@1619: {
fp@1619:     return eoe->slave && eoe->opened;
fp@1619: }
fp@1619: 
fp@1619: /*****************************************************************************/
fp@1619: 
fp@1619: /**
fp@1619:    Prints EoE handler information.
fp@1619: */
fp@1619: 
fp@1619: void ec_eoe_print(const ec_eoe_t *eoe /**< EoE handler */)
fp@1619: {
fp@1619:     EC_INFO("  EoE handler %s\n", eoe->dev->name);
fp@1619:     EC_INFO("    State: %s\n", eoe->opened ? "opened" : "closed");
fp@1619:     if (eoe->slave)
fp@1619:         EC_INFO("    Coupled to slave %i.\n", eoe->slave->ring_position);
fp@1619:     else
fp@1619:         EC_INFO("    Not coupled.\n");
fp@1619: }
fp@1619: 
fp@1619: /******************************************************************************
fp@1619:  *  STATE PROCESSING FUNCTIONS
fp@1619:  *****************************************************************************/
fp@1619: 
fp@1619: /**
fp@1619:    State: RX_START.
fp@1624:    Starts a new receiving sequence by queueing a datagram that checks the
fp@1624:    slave's mailbox for a new EoE datagram.
fp@1619: */
fp@1619: 
fp@1619: void ec_eoe_state_rx_start(ec_eoe_t *eoe /**< EoE handler */)
fp@1619: {
fp@1619:     if (!eoe->slave->online || !eoe->slave->master->device->link_state)
fp@1619:         return;
fp@1619: 
fp@1624:     ec_slave_mbox_prepare_check(eoe->slave, &eoe->datagram);
fp@1624:     ec_master_queue_datagram(eoe->slave->master, &eoe->datagram);
fp@1619:     eoe->state = ec_eoe_state_rx_check;
fp@1619: }
fp@1619: 
fp@1619: /*****************************************************************************/
fp@1619: 
fp@1619: /**
fp@1619:    State: RX_CHECK.
fp@1624:    Processes the checking datagram sent in RX_START and issues a receive
fp@1624:    datagram, if new data is available.
fp@1619: */
fp@1619: 
fp@1619: void ec_eoe_state_rx_check(ec_eoe_t *eoe /**< EoE handler */)
fp@1619: {
fp@1624:     if (eoe->datagram.state != EC_CMD_RECEIVED) {
fp@1619:         eoe->stats.rx_errors++;
fp@1619:         eoe->state = ec_eoe_state_tx_start;
fp@1619:         return;
fp@1619:     }
fp@1619: 
fp@1624:     if (!ec_slave_mbox_check(&eoe->datagram)) {
fp@1619:         eoe->state = ec_eoe_state_tx_start;
fp@1619:         return;
fp@1619:     }
fp@1619: 
fp@1624:     ec_slave_mbox_prepare_fetch(eoe->slave, &eoe->datagram);
fp@1624:     ec_master_queue_datagram(eoe->slave->master, &eoe->datagram);
fp@1619:     eoe->state = ec_eoe_state_rx_fetch;
fp@1619: }
fp@1619: 
fp@1619: /*****************************************************************************/
fp@1619: 
fp@1619: /**
fp@1619:    State: RX_FETCH.
fp@1619:    Checks if the requested data of RX_CHECK was received and processes the
fp@1624:    EoE datagram.
fp@1619: */
fp@1619: 
fp@1619: void ec_eoe_state_rx_fetch(ec_eoe_t *eoe /**< EoE handler */)
fp@1619: {
fp@1619:     size_t rec_size, data_size;
fp@1619:     uint8_t *data, frame_type, last_fragment, time_appended;
fp@1619:     uint8_t frame_number, fragment_offset, fragment_number;
fp@1619:     off_t offset;
fp@1619: 
fp@1624:     if (eoe->datagram.state != EC_CMD_RECEIVED) {
fp@1619:         eoe->stats.rx_errors++;
fp@1619:         eoe->state = ec_eoe_state_tx_start;
fp@1619:         return;
fp@1619:     }
fp@1619: 
fp@1624:     if (!(data = ec_slave_mbox_fetch(eoe->slave, &eoe->datagram,
fp@1621:                                      0x02, &rec_size))) {
fp@1619:         eoe->stats.rx_errors++;
fp@1619:         eoe->state = ec_eoe_state_tx_start;
fp@1619:         return;
fp@1619:     }
fp@1619: 
fp@1619:     frame_type = EC_READ_U16(data) & 0x000F;
fp@1619: 
fp@1624:     if (frame_type != 0x00) {
fp@1619: #if EOE_DEBUG_LEVEL > 0
fp@1619:         EC_DBG("other frame received.\n");
fp@1619: #endif
fp@1619:         eoe->stats.rx_dropped++;
fp@1619:         eoe->state = ec_eoe_state_tx_start;
fp@1624:         return;
fp@1624:     }
fp@1624: 
fp@1624:     // EoE Fragment Request received
fp@1624: 
fp@1624:     last_fragment = (EC_READ_U16(data) >> 8) & 0x0001;
fp@1624:     time_appended = (EC_READ_U16(data) >> 9) & 0x0001;
fp@1624:     fragment_number = EC_READ_U16(data + 2) & 0x003F;
fp@1624:     fragment_offset = (EC_READ_U16(data + 2) >> 6) & 0x003F;
fp@1624:     frame_number = (EC_READ_U16(data + 2) >> 12) & 0x000F;
fp@1624: 
fp@1624: #if EOE_DEBUG_LEVEL > 0
fp@1624:     EC_DBG("EoE RX fragment %i, offset %i, frame %i%s%s,"
fp@1624:            " %i octets\n", fragment_number, fragment_offset,
fp@1624:            frame_number,
fp@1624:            last_fragment ? ", last fragment" : "",
fp@1624:            time_appended ? ", + timestamp" : "",
fp@1624:            time_appended ? rec_size - 8 : rec_size - 4);
fp@1624: #endif
fp@1624: 
fp@1624: #if EOE_DEBUG_LEVEL > 1
fp@1624:     EC_DBG("");
fp@1624:     for (i = 0; i < rec_size - 4; i++) {
fp@1624:         printk("%02X ", data[i + 4]);
fp@1624:         if ((i + 1) % 16 == 0) {
fp@1624:             printk("\n");
fp@1624:             EC_DBG("");
fp@1624:         }
fp@1624:     }
fp@1624:     printk("\n");
fp@1624: #endif
fp@1624: 
fp@1624:     data_size = time_appended ? rec_size - 8 : rec_size - 4;
fp@1624: 
fp@1624:     if (!fragment_number) {
fp@1624:         if (eoe->rx_skb) {
fp@1624:             EC_WARN("EoE RX freeing old socket buffer...\n");
fp@1624:             dev_kfree_skb(eoe->rx_skb);
fp@1624:         }
fp@1624: 
fp@1624:         // new socket buffer
fp@1624:         if (!(eoe->rx_skb = dev_alloc_skb(fragment_offset * 32))) {
fp@1624:             if (printk_ratelimit())
fp@1624:                 EC_WARN("EoE RX low on mem. frame dropped.\n");
fp@1624:             eoe->stats.rx_dropped++;
fp@1624:             eoe->state = ec_eoe_state_tx_start;
fp@1624:             return;
fp@1624:         }
fp@1624: 
fp@1624:         eoe->rx_skb_offset = 0;
fp@1624:         eoe->rx_skb_size = fragment_offset * 32;
fp@1624:         eoe->rx_expected_fragment = 0;
fp@1624:     }
fp@1624:     else {
fp@1624:         if (!eoe->rx_skb) {
fp@1624:             eoe->stats.rx_dropped++;
fp@1624:             eoe->state = ec_eoe_state_tx_start;
fp@1624:             return;
fp@1624:         }
fp@1624: 
fp@1624:         offset = fragment_offset * 32;
fp@1624:         if (offset != eoe->rx_skb_offset ||
fp@1624:             offset + data_size > eoe->rx_skb_size ||
fp@1624:             fragment_number != eoe->rx_expected_fragment) {
fp@1624:             dev_kfree_skb(eoe->rx_skb);
fp@1624:             eoe->rx_skb = NULL;
fp@1624:             eoe->stats.rx_errors++;
fp@1624:             eoe->state = ec_eoe_state_tx_start;
fp@1624:             return;
fp@1624:         }
fp@1624:     }
fp@1624: 
fp@1624:     // copy fragment into socket buffer
fp@1624:     memcpy(skb_put(eoe->rx_skb, data_size), data + 4, data_size);
fp@1624:     eoe->rx_skb_offset += data_size;
fp@1624: 
fp@1624:     if (last_fragment) {
fp@1624:         // update statistics
fp@1624:         eoe->stats.rx_packets++;
fp@1624:         eoe->stats.rx_bytes += eoe->rx_skb->len;
fp@1624: 
fp@1624: #if EOE_DEBUG_LEVEL > 0
fp@1624:         EC_DBG("EoE RX frame completed with %u octets.\n",
fp@1624:                eoe->rx_skb->len);
fp@1624: #endif
fp@1624: 
fp@1624:         // pass socket buffer to network stack
fp@1624:         eoe->rx_skb->dev = eoe->dev;
fp@1624:         eoe->rx_skb->protocol = eth_type_trans(eoe->rx_skb, eoe->dev);
fp@1624:         eoe->rx_skb->ip_summed = CHECKSUM_UNNECESSARY;
fp@1624:         if (netif_rx(eoe->rx_skb)) {
fp@1624:             EC_WARN("EoE RX netif_rx failed.\n");
fp@1624:         }
fp@1624:         eoe->rx_skb = NULL;
fp@1624: 
fp@1624:         eoe->state = ec_eoe_state_tx_start;
fp@1624:     }
fp@1624:     else {
fp@1624:         eoe->rx_expected_fragment++;
fp@1624: #if EOE_DEBUG_LEVEL > 0
fp@1624:         EC_DBG("EoE RX expecting fragment %i\n",
fp@1624:                eoe->rx_expected_fragment);
fp@1624: #endif
fp@1624:         eoe->state = ec_eoe_state_rx_start;
fp@1619:     }
fp@1619: }
fp@1619: 
fp@1619: /*****************************************************************************/
fp@1619: 
fp@1619: /**
fp@1619:    State: TX START.
fp@1619:    Starts a new transmit sequence. If no data is available, a new receive
fp@1619:    sequence is started instead.
fp@1619: */
fp@1619: 
fp@1619: void ec_eoe_state_tx_start(ec_eoe_t *eoe /**< EoE handler */)
fp@1619: {
fp@1619: #if EOE_DEBUG_LEVEL > 0
fp@1619:     unsigned int wakeup;
fp@1619: #endif
fp@1619: 
fp@1619:     if (!eoe->slave->online || !eoe->slave->master->device->link_state)
fp@1619:         return;
fp@1619: 
fp@1619:     spin_lock_bh(&eoe->tx_queue_lock);
fp@1619: 
fp@1619:     if (!eoe->tx_queued_frames || list_empty(&eoe->tx_queue)) {
fp@1619:         spin_unlock_bh(&eoe->tx_queue_lock);
fp@1619:         // no data available.
fp@1619:         // start a new receive immediately.
fp@1619:         ec_eoe_state_rx_start(eoe);
fp@1619:         return;
fp@1619:     }
fp@1619: 
fp@1619:     // take the first frame out of the queue
fp@1619:     eoe->tx_frame = list_entry(eoe->tx_queue.next, ec_eoe_frame_t, queue);
fp@1619:     list_del(&eoe->tx_frame->queue);
fp@1619:     if (!eoe->tx_queue_active &&
fp@1619:         eoe->tx_queued_frames == EC_EOE_TX_QUEUE_SIZE / 2) {
fp@1619:         netif_wake_queue(eoe->dev);
fp@1619:         eoe->tx_queue_active = 1;
fp@1619: #if EOE_DEBUG_LEVEL > 0
fp@1619:         wakeup = 1;
fp@1619: #endif
fp@1619:     }
fp@1619: 
fp@1619:     eoe->tx_queued_frames--;
fp@1619:     spin_unlock_bh(&eoe->tx_queue_lock);
fp@1619: 
fp@1619:     eoe->tx_frame_number++;
fp@1619:     eoe->tx_frame_number %= 16;
fp@1619:     eoe->tx_fragment_number = 0;
fp@1619:     eoe->tx_offset = 0;
fp@1619: 
fp@1619:     if (ec_eoe_send(eoe)) {
fp@1619:         dev_kfree_skb(eoe->tx_frame->skb);
fp@1619:         kfree(eoe->tx_frame);
fp@1619:         eoe->tx_frame = NULL;
fp@1619:         eoe->stats.tx_errors++;
fp@1619:         eoe->state = ec_eoe_state_rx_start;
fp@1619:         return;
fp@1619:     }
fp@1619: 
fp@1619: #if EOE_DEBUG_LEVEL > 0
fp@1619:     if (wakeup) EC_DBG("waking up TX queue...\n");
fp@1619: #endif
fp@1619: 
fp@1619:     eoe->state = ec_eoe_state_tx_sent;
fp@1619: }
fp@1619: 
fp@1619: /*****************************************************************************/
fp@1619: 
fp@1619: /**
fp@1619:    State: TX SENT.
fp@1624:    Checks is the previous transmit datagram succeded and sends the next
fp@1619:    fragment, if necessary.
fp@1619: */
fp@1619: 
fp@1619: void ec_eoe_state_tx_sent(ec_eoe_t *eoe /**< EoE handler */)
fp@1619: {
fp@1624:     if (eoe->datagram.state != EC_CMD_RECEIVED) {
fp@1619:         eoe->stats.tx_errors++;
fp@1619:         eoe->state = ec_eoe_state_rx_start;
fp@1619:         return;
fp@1619:     }
fp@1619: 
fp@1624:     if (eoe->datagram.working_counter != 1) {
fp@1619:         eoe->stats.tx_errors++;
fp@1619:         eoe->state = ec_eoe_state_rx_start;
fp@1619:         return;
fp@1619:     }
fp@1619: 
fp@1619:     // frame completely sent
fp@1619:     if (eoe->tx_offset >= eoe->tx_frame->skb->len) {
fp@1619:         eoe->stats.tx_packets++;
fp@1619:         eoe->stats.tx_bytes += eoe->tx_frame->skb->len;
fp@1619:         dev_kfree_skb(eoe->tx_frame->skb);
fp@1619:         kfree(eoe->tx_frame);
fp@1619:         eoe->tx_frame = NULL;
fp@1619:         eoe->state = ec_eoe_state_rx_start;
fp@1619:     }
fp@1619:     else { // send next fragment
fp@1619:         if (ec_eoe_send(eoe)) {
fp@1619:             dev_kfree_skb(eoe->tx_frame->skb);
fp@1619:             kfree(eoe->tx_frame);
fp@1619:             eoe->tx_frame = NULL;
fp@1619:             eoe->stats.tx_errors++;
fp@1619:             eoe->state = ec_eoe_state_rx_start;
fp@1619:         }
fp@1619:     }
fp@1619: }
fp@1619: 
fp@1619: /******************************************************************************
fp@1619:  *  NET_DEVICE functions
fp@1619:  *****************************************************************************/
fp@1619: 
fp@1619: /**
fp@1619:    Opens the virtual network device.
fp@1619: */
fp@1619: 
fp@1619: int ec_eoedev_open(struct net_device *dev /**< EoE net_device */)
fp@1619: {
fp@1619:     ec_eoe_t *eoe = *((ec_eoe_t **) netdev_priv(dev));
fp@1619:     ec_eoe_flush(eoe);
fp@1619:     eoe->opened = 1;
fp@1619:     netif_start_queue(dev);
fp@1619:     eoe->tx_queue_active = 1;
fp@1619:     EC_INFO("%s opened.\n", dev->name);
fp@1619:     if (!eoe->slave)
fp@1619:         EC_WARN("device %s is not coupled to any EoE slave!\n", dev->name);
fp@1619:     else {
fp@1619:         eoe->slave->requested_state = EC_SLAVE_STATE_OP;
fp@1624:         eoe->slave->error_flag = 0;
fp@1619:     }
fp@1619:     return 0;
fp@1619: }
fp@1619: 
fp@1619: /*****************************************************************************/
fp@1619: 
fp@1619: /**
fp@1619:    Stops the virtual network device.
fp@1619: */
fp@1619: 
fp@1619: int ec_eoedev_stop(struct net_device *dev /**< EoE net_device */)
fp@1619: {
fp@1619:     ec_eoe_t *eoe = *((ec_eoe_t **) netdev_priv(dev));
fp@1619:     netif_stop_queue(dev);
fp@1619:     eoe->tx_queue_active = 0;
fp@1619:     eoe->opened = 0;
fp@1619:     ec_eoe_flush(eoe);
fp@1619:     EC_INFO("%s stopped.\n", dev->name);
fp@1619:     if (!eoe->slave)
fp@1619:         EC_WARN("device %s is not coupled to any EoE slave!\n", dev->name);
fp@1619:     else {
fp@1619:         eoe->slave->requested_state = EC_SLAVE_STATE_INIT;
fp@1624:         eoe->slave->error_flag = 0;
fp@1619:     }
fp@1619:     return 0;
fp@1619: }
fp@1619: 
fp@1619: /*****************************************************************************/
fp@1619: 
fp@1619: /**
fp@1619:    Transmits data via the virtual network device.
fp@1619: */
fp@1619: 
fp@1619: int ec_eoedev_tx(struct sk_buff *skb, /**< transmit socket buffer */
fp@1619:                  struct net_device *dev /**< EoE net_device */
fp@1619:                 )
fp@1619: {
fp@1619:     ec_eoe_t *eoe = *((ec_eoe_t **) netdev_priv(dev));
fp@1619:     ec_eoe_frame_t *frame;
fp@1619: 
fp@1619: #if 0
fp@1619:     if (skb->len > eoe->slave->sii_tx_mailbox_size - 10) {
fp@1619:         EC_WARN("EoE TX frame (%i octets) exceeds MTU. dropping.\n", skb->len);
fp@1619:         dev_kfree_skb(skb);
fp@1619:         eoe->stats.tx_dropped++;
fp@1619:         return 0;
fp@1619:     }
fp@1619: #endif
fp@1619: 
fp@1619:     if (!(frame =
fp@1619:           (ec_eoe_frame_t *) kmalloc(sizeof(ec_eoe_frame_t), GFP_ATOMIC))) {
fp@1619:         if (printk_ratelimit())
fp@1619:             EC_WARN("EoE TX: low on mem. frame dropped.\n");
fp@1619:         return 1;
fp@1619:     }
fp@1619: 
fp@1619:     frame->skb = skb;
fp@1619: 
fp@1619:     spin_lock_bh(&eoe->tx_queue_lock);
fp@1619:     list_add_tail(&frame->queue, &eoe->tx_queue);
fp@1619:     eoe->tx_queued_frames++;
fp@1619:     if (eoe->tx_queued_frames == EC_EOE_TX_QUEUE_SIZE) {
fp@1619:         netif_stop_queue(dev);
fp@1619:         eoe->tx_queue_active = 0;
fp@1619:     }
fp@1619:     spin_unlock_bh(&eoe->tx_queue_lock);
fp@1619: 
fp@1619: #if EOE_DEBUG_LEVEL > 0
fp@1619:     EC_DBG("EoE TX queued frame with %i octets (%i frames queued).\n",
fp@1619:            skb->len, eoe->tx_queued_frames);
fp@1619:     if (!eoe->tx_queue_active)
fp@1619:         EC_WARN("EoE TX queue is now full.\n");
fp@1619: #endif
fp@1619: 
fp@1619:     return 0;
fp@1619: }
fp@1619: 
fp@1619: /*****************************************************************************/
fp@1619: 
fp@1619: /**
fp@1619:    Gets statistics about the virtual network device.
fp@1619: */
fp@1619: 
fp@1619: struct net_device_stats *ec_eoedev_stats(struct net_device *dev
fp@1619:                                          /**< EoE net_device */)
fp@1619: {
fp@1619:     ec_eoe_t *eoe = *((ec_eoe_t **) netdev_priv(dev));
fp@1619:     return &eoe->stats;
fp@1619: }
fp@1619: 
fp@1619: /*****************************************************************************/