fp@145: /******************************************************************************
fp@145:  *
fp@145:  *  $Id$
fp@145:  *
fp@197:  *  Copyright (C) 2006  Florian Pose, Ingenieurgemeinschaft IgH
fp@197:  *
fp@197:  *  This file is part of the IgH EtherCAT Master.
fp@197:  *
fp@197:  *  The IgH EtherCAT Master is free software; you can redistribute it
fp@197:  *  and/or modify it under the terms of the GNU General Public License
fp@246:  *  as published by the Free Software Foundation; either version 2 of the
fp@246:  *  License, or (at your option) any later version.
fp@197:  *
fp@197:  *  The IgH EtherCAT Master is distributed in the hope that it will be
fp@197:  *  useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
fp@197:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
fp@197:  *  GNU General Public License for more details.
fp@197:  *
fp@197:  *  You should have received a copy of the GNU General Public License
fp@197:  *  along with the IgH EtherCAT Master; if not, write to the Free Software
fp@197:  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
fp@197:  *
fp@246:  *  The right to use EtherCAT Technology is granted and comes free of
fp@246:  *  charge under condition of compatibility of product made by
fp@246:  *  Licensee. People intending to distribute/sell products based on the
fp@246:  *  code, have to sign an agreement to guarantee that products using
fp@246:  *  software based on IgH EtherCAT master stay compatible with the actual
fp@246:  *  EtherCAT specification (which are released themselves as an open
fp@246:  *  standard) as the (only) precondition to have the right to use EtherCAT
fp@246:  *  Technology, IP and trade marks.
fp@246:  *
fp@145:  *****************************************************************************/
fp@145: 
fp@199: /**
fp@199:    \file
fp@199:    Ethernet-over-EtherCAT (EoE).
fp@199: */
fp@199: 
fp@199: /*****************************************************************************/
fp@199: 
fp@294: #include <linux/netdevice.h>
fp@210: #include <linux/etherdevice.h>
fp@210: 
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@1744: /*****************************************************************************/
fp@1744: 
fp@1744: /**
fp@1744:  * Defines the debug level of EoE processing.
fp@1744:  *
fp@1744:  * 0 = No debug messages.
fp@1744:  * 1 = Output actions.
fp@1744:  * 2 = Output actions and frame data.
fp@1744:  */
fp@286: 
fp@216: #define EOE_DEBUG_LEVEL 0
fp@215: 
fp@1744: /** size of the EoE tx queue */
fp@1744: #define EC_EOE_TX_QUEUE_SIZE 100
fp@1744: 
fp@145: /*****************************************************************************/
fp@145: 
fp@214: void ec_eoe_flush(ec_eoe_t *);
fp@218: 
fp@218: // state functions
fp@218: void ec_eoe_state_rx_start(ec_eoe_t *);
fp@218: void ec_eoe_state_rx_check(ec_eoe_t *);
fp@218: void ec_eoe_state_rx_fetch(ec_eoe_t *);
fp@218: void ec_eoe_state_tx_start(ec_eoe_t *);
fp@218: void ec_eoe_state_tx_sent(ec_eoe_t *);
fp@218: 
fp@218: // net_device functions
fp@203: int ec_eoedev_open(struct net_device *);
fp@203: int ec_eoedev_stop(struct net_device *);
fp@203: int ec_eoedev_tx(struct sk_buff *, struct net_device *);
fp@203: struct net_device_stats *ec_eoedev_stats(struct net_device *);
fp@203: 
fp@203: /*****************************************************************************/
fp@203: 
fp@203: /**
fp@1744:  * EoE constructor.
fp@1744:  * Initializes the EoE handler, creates a net_device and registers it.
fp@1744:  */
fp@1744: 
fp@1744: int ec_eoe_init(
fp@1744:         ec_eoe_t *eoe, /**< EoE handler */
fp@1744:         ec_slave_t *slave /**< EtherCAT slave */
fp@1744:         )
fp@203: {
fp@213:     ec_eoe_t **priv;
fp@218:     int result, i;
fp@1745:     char name[EC_DATAGRAM_NAME_SIZE];
fp@1744: 
fp@1744:     eoe->slave = slave;
fp@1744: 
fp@293:     ec_datagram_init(&eoe->datagram);
fp@1745:     eoe->queue_datagram = 0;
fp@218:     eoe->state = ec_eoe_state_rx_start;
fp@210:     eoe->opened = 0;
fp@218:     eoe->rx_skb = NULL;
fp@218:     eoe->rx_expected_fragment = 0;
fp@212:     INIT_LIST_HEAD(&eoe->tx_queue);
fp@218:     eoe->tx_frame = NULL;
fp@214:     eoe->tx_queue_active = 0;
fp@218:     eoe->tx_queued_frames = 0;
fp@212:     eoe->tx_queue_lock = SPIN_LOCK_UNLOCKED;
fp@214:     eoe->tx_frame_number = 0xFF;
fp@214:     memset(&eoe->stats, 0, sizeof(struct net_device_stats));
fp@203: 
fp@1716:     eoe->rx_counter = 0;
fp@1716:     eoe->tx_counter = 0;
fp@1716:     eoe->rx_rate = 0;
fp@1716:     eoe->tx_rate = 0;
fp@1719:     eoe->rate_jiffies = 0;
fp@1716: 
fp@1745:     /* device name eoe<MASTER>[as]<SLAVE>, because networking scripts don't
fp@1745:      * like hyphens etc. in interface names. */
fp@1745:     if (slave->sii_alias) {
fp@1745:         snprintf(name, EC_DATAGRAM_NAME_SIZE,
fp@1745:                 "eoe%ua%u", slave->master->index, slave->sii_alias);
fp@1745:     } else {
fp@1745:         snprintf(name, EC_DATAGRAM_NAME_SIZE,
fp@1745:                 "eoe%us%u", slave->master->index, slave->ring_position);
fp@1745:     }
fp@1745: 
fp@1745:     snprintf(eoe->datagram.name, EC_DATAGRAM_NAME_SIZE, name);
fp@1744: 
fp@1744:     if (!(eoe->dev = alloc_netdev(sizeof(ec_eoe_t *), name, ether_setup))) {
fp@1745:         EC_ERR("Unable to allocate net_device %s for EoE handler!\n", name);
fp@203:         goto out_return;
fp@203:     }
fp@203: 
fp@218:     // initialize net_device
fp@218:     eoe->dev->open = ec_eoedev_open;
fp@218:     eoe->dev->stop = ec_eoedev_stop;
fp@218:     eoe->dev->hard_start_xmit = ec_eoedev_tx;
fp@218:     eoe->dev->get_stats = ec_eoedev_stats;
fp@218: 
fp@218:     for (i = 0; i < ETH_ALEN; i++)
fp@218:         eoe->dev->dev_addr[i] = i | (i << 4);
fp@218: 
fp@218:     // initialize private data
fp@203:     priv = netdev_priv(eoe->dev);
fp@213:     *priv = eoe;
fp@203: 
fp@218:     // Usually setting the MTU appropriately makes the upper layers
fp@218:     // do the frame fragmenting. In some cases this doesn't work
fp@218:     // so the MTU is left on the Ethernet standard value and fragmenting
fp@218:     // is done "manually".
fp@218: #if 0
fp@215:     eoe->dev->mtu = slave->sii_rx_mailbox_size - ETH_HLEN - 10;
fp@218: #endif
fp@214: 
fp@203:     // connect the net_device to the kernel
fp@203:     if ((result = register_netdev(eoe->dev))) {
fp@203:         EC_ERR("Unable to register net_device: error %i\n", result);
fp@203:         goto out_free;
fp@203:     }
fp@203: 
fp@218:     // make the last address octet unique
fp@218:     eoe->dev->dev_addr[ETH_ALEN - 1] = (uint8_t) eoe->dev->ifindex;
fp@203:     return 0;
fp@203: 
fp@203:  out_free:
fp@203:     free_netdev(eoe->dev);
fp@203:     eoe->dev = NULL;
fp@203:  out_return:
fp@203:     return -1;
fp@145: }
fp@145: 
fp@145: /*****************************************************************************/
fp@145: 
fp@197: /**
fp@199:    EoE destructor.
fp@218:    Unregisteres the net_device and frees allocated memory.
fp@218: */
fp@218: 
fp@251: void ec_eoe_clear(ec_eoe_t *eoe /**< EoE handler */)
fp@145: {
fp@1739:     unregister_netdev(eoe->dev); // possibly calls close callback
fp@1715:     free_netdev(eoe->dev);
fp@214: 
fp@214:     // empty transmit queue
fp@214:     ec_eoe_flush(eoe);
fp@218: 
fp@218:     if (eoe->tx_frame) {
fp@218:         dev_kfree_skb(eoe->tx_frame->skb);
fp@218:         kfree(eoe->tx_frame);
fp@218:     }
fp@218: 
fp@218:     if (eoe->rx_skb) dev_kfree_skb(eoe->rx_skb);
fp@279: 
fp@293:     ec_datagram_clear(&eoe->datagram);
fp@214: }
fp@214: 
fp@214: /*****************************************************************************/
fp@214: 
fp@214: /**
fp@214:    Empties the transmit queue.
fp@214: */
fp@214: 
fp@251: void ec_eoe_flush(ec_eoe_t *eoe /**< EoE handler */)
fp@214: {
fp@214:     ec_eoe_frame_t *frame, *next;
fp@214: 
fp@214:     spin_lock_bh(&eoe->tx_queue_lock);
fp@214: 
fp@214:     list_for_each_entry_safe(frame, next, &eoe->tx_queue, queue) {
fp@214:         list_del(&frame->queue);
fp@214:         dev_kfree_skb(frame->skb);
fp@214:         kfree(frame);
fp@214:     }
fp@218:     eoe->tx_queued_frames = 0;
fp@214: 
fp@214:     spin_unlock_bh(&eoe->tx_queue_lock);
fp@145: }
fp@145: 
fp@145: /*****************************************************************************/
fp@145: 
fp@197: /**
fp@217:    Sends a frame or the next fragment.
fp@217: */
fp@217: 
fp@251: int ec_eoe_send(ec_eoe_t *eoe /**< EoE handler */)
fp@218: {
fp@217:     size_t remaining_size, current_size, complete_offset;
fp@217:     unsigned int last_fragment;
fp@217:     uint8_t *data;
fp@217: #if EOE_DEBUG_LEVEL > 1
fp@217:     unsigned int i;
fp@217: #endif
fp@217: 
fp@218:     remaining_size = eoe->tx_frame->skb->len - eoe->tx_offset;
fp@217: 
fp@217:     if (remaining_size <= eoe->slave->sii_tx_mailbox_size - 10) {
fp@217:         current_size = remaining_size;
fp@217:         last_fragment = 1;
fp@217:     }
fp@217:     else {
fp@217:         current_size = ((eoe->slave->sii_tx_mailbox_size - 10) / 32) * 32;
fp@217:         last_fragment = 0;
fp@217:     }
fp@217: 
fp@217:     if (eoe->tx_fragment_number) {
fp@217:         complete_offset = eoe->tx_offset / 32;
fp@217:     }
fp@217:     else {
fp@1715:         // complete size in 32 bit blocks, rounded up.
fp@217:         complete_offset = remaining_size / 32 + 1;
fp@217:     }
fp@217: 
fp@217: #if EOE_DEBUG_LEVEL > 0
fp@217:     EC_DBG("EoE TX sending %sfragment %i with %i octets (%i)."
fp@217:            " %i frames queued.\n", last_fragment ? "last " : "",
fp@217:            eoe->tx_fragment_number, current_size, complete_offset,
fp@218:            eoe->tx_queued_frames);
fp@217: #endif
fp@217: 
fp@217: #if EOE_DEBUG_LEVEL > 1
fp@217:     EC_DBG("");
fp@217:     for (i = 0; i < current_size; i++) {
fp@1716:         printk("%02X ", eoe->tx_frame->skb->data[eoe->tx_offset + i]);
fp@217:         if ((i + 1) % 16 == 0) {
fp@217:             printk("\n");
fp@217:             EC_DBG("");
fp@217:         }
fp@217:     }
fp@217:     printk("\n");
fp@217: #endif
fp@217: 
fp@293:     if (!(data = ec_slave_mbox_prepare_send(eoe->slave, &eoe->datagram,
fp@279:                                             0x02, current_size + 4)))
fp@217:         return -1;
fp@217: 
fp@217:     EC_WRITE_U8 (data,     0x00); // eoe fragment req.
fp@217:     EC_WRITE_U8 (data + 1, last_fragment);
fp@217:     EC_WRITE_U16(data + 2, ((eoe->tx_fragment_number & 0x3F) |
fp@217:                             (complete_offset & 0x3F) << 6 |
fp@217:                             (eoe->tx_frame_number & 0x0F) << 12));
fp@217: 
fp@218:     memcpy(data + 4, eoe->tx_frame->skb->data + eoe->tx_offset, current_size);
fp@1745:     eoe->queue_datagram = 1;
fp@217: 
fp@217:     eoe->tx_offset += current_size;
fp@217:     eoe->tx_fragment_number++;
fp@217:     return 0;
fp@217: }
fp@217: 
fp@217: /*****************************************************************************/
fp@217: 
fp@217: /**
fp@199:    Runs the EoE state machine.
fp@197: */
fp@197: 
fp@251: void ec_eoe_run(ec_eoe_t *eoe /**< EoE handler */)
fp@218: {
fp@210:     if (!eoe->opened) return;
fp@145: 
fp@1745:     // if the datagram was not sent, or is not yet received, skip this cycle
fp@1745:     if (eoe->queue_datagram || eoe->datagram.state == EC_DATAGRAM_SENT)
fp@1745:         return;
fp@1745: 
fp@218:     // call state function
fp@218:     eoe->state(eoe);
fp@1716: 
fp@1716:     // update statistics
fp@1719:     if (jiffies - eoe->rate_jiffies > HZ) {
fp@1716:         eoe->rx_rate = eoe->rx_counter * 8;
fp@1716:         eoe->tx_rate = eoe->tx_counter * 8;
fp@1716:         eoe->rx_counter = 0;
fp@1716:         eoe->tx_counter = 0;
fp@1719:         eoe->rate_jiffies = jiffies;
fp@1716:     }
fp@1745: 
fp@1745:     ec_datagram_output_stats(&eoe->datagram);
fp@1745: }
fp@1745: 
fp@1745: /*****************************************************************************/
fp@1745: 
fp@1745: /**
fp@1745:  * Queues the datagram, if necessary.
fp@1745:  */
fp@1745: 
fp@1745: void ec_eoe_queue(ec_eoe_t *eoe /**< EoE handler */)
fp@1745: {
fp@1745:    if (eoe->queue_datagram) {
fp@1745:        ec_master_queue_datagram(eoe->slave->master, &eoe->datagram);
fp@1745:        eoe->queue_datagram = 0;
fp@1745:    }
fp@145: }
fp@145: 
fp@145: /*****************************************************************************/
fp@145: 
fp@197: /**
fp@235:    Returns the state of the device.
fp@235:    \return 1 if the device is "up", 0 if it is "down"
fp@235: */
fp@235: 
fp@1744: int ec_eoe_is_open(const ec_eoe_t *eoe /**< EoE handler */)
fp@1744: {
fp@1744:     return eoe->opened;
fp@251: }
fp@251: 
fp@218: /******************************************************************************
fp@218:  *  STATE PROCESSING FUNCTIONS
fp@218:  *****************************************************************************/
fp@218: 
fp@218: /**
fp@218:    State: RX_START.
fp@293:    Starts a new receiving sequence by queueing a datagram that checks the
fp@293:    slave's mailbox for a new EoE datagram.
fp@218: */
fp@218: 
fp@251: void ec_eoe_state_rx_start(ec_eoe_t *eoe /**< EoE handler */)
fp@218: {
fp@1744:     if (eoe->slave->online_state == EC_SLAVE_OFFLINE ||
fp@1744:             !eoe->slave->master->main_device.link_state)
fp@261:         return;
fp@261: 
fp@293:     ec_slave_mbox_prepare_check(eoe->slave, &eoe->datagram);
fp@1745:     eoe->queue_datagram = 1;
fp@218:     eoe->state = ec_eoe_state_rx_check;
fp@218: }
fp@218: 
fp@218: /*****************************************************************************/
fp@218: 
fp@218: /**
fp@218:    State: RX_CHECK.
fp@293:    Processes the checking datagram sent in RX_START and issues a receive
fp@293:    datagram, if new data is available.
fp@218: */
fp@218: 
fp@251: void ec_eoe_state_rx_check(ec_eoe_t *eoe /**< EoE handler */)
fp@218: {
fp@1715:     if (eoe->datagram.state != EC_DATAGRAM_RECEIVED) {
fp@218:         eoe->stats.rx_errors++;
fp@218:         eoe->state = ec_eoe_state_tx_start;
fp@218:         return;
fp@218:     }
fp@218: 
fp@293:     if (!ec_slave_mbox_check(&eoe->datagram)) {
fp@218:         eoe->state = ec_eoe_state_tx_start;
fp@218:         return;
fp@218:     }
fp@218: 
fp@293:     ec_slave_mbox_prepare_fetch(eoe->slave, &eoe->datagram);
fp@1745:     eoe->queue_datagram = 1;
fp@218:     eoe->state = ec_eoe_state_rx_fetch;
fp@218: }
fp@218: 
fp@218: /*****************************************************************************/
fp@218: 
fp@218: /**
fp@218:    State: RX_FETCH.
fp@218:    Checks if the requested data of RX_CHECK was received and processes the
fp@293:    EoE datagram.
fp@218: */
fp@218: 
fp@251: void ec_eoe_state_rx_fetch(ec_eoe_t *eoe /**< EoE handler */)
fp@218: {
fp@218:     size_t rec_size, data_size;
fp@1731:     uint8_t *data, frame_type, last_fragment, time_appended, mbox_prot;
fp@218:     uint8_t frame_number, fragment_offset, fragment_number;
fp@218:     off_t offset;
fp@1716: #if EOE_DEBUG_LEVEL > 1
fp@1716:     unsigned int i;
fp@1716: #endif
fp@218: 
fp@1715:     if (eoe->datagram.state != EC_DATAGRAM_RECEIVED) {
fp@218:         eoe->stats.rx_errors++;
fp@218:         eoe->state = ec_eoe_state_tx_start;
fp@218:         return;
fp@218:     }
fp@218: 
fp@293:     if (!(data = ec_slave_mbox_fetch(eoe->slave, &eoe->datagram,
fp@1731:                                      &mbox_prot, &rec_size))) {
fp@1731:         eoe->stats.rx_errors++;
fp@1731:         eoe->state = ec_eoe_state_tx_start;
fp@1731:         return;
fp@1731:     }
fp@1731: 
fp@1744:     if (mbox_prot != 0x02) { // EoE FIXME mailbox handler necessary
fp@218:         eoe->stats.rx_errors++;
fp@218:         eoe->state = ec_eoe_state_tx_start;
fp@218:         return;
fp@218:     }
fp@218: 
fp@218:     frame_type = EC_READ_U16(data) & 0x000F;
fp@218: 
fp@1715:     if (frame_type != 0x00) {
fp@218: #if EOE_DEBUG_LEVEL > 0
fp@218:         EC_DBG("other frame received.\n");
fp@218: #endif
fp@218:         eoe->stats.rx_dropped++;
fp@218:         eoe->state = ec_eoe_state_tx_start;
fp@1715:         return;
fp@1715:     }
fp@1715: 
fp@1715:     // EoE Fragment Request received
fp@1715: 
fp@1715:     last_fragment = (EC_READ_U16(data) >> 8) & 0x0001;
fp@1715:     time_appended = (EC_READ_U16(data) >> 9) & 0x0001;
fp@1715:     fragment_number = EC_READ_U16(data + 2) & 0x003F;
fp@1715:     fragment_offset = (EC_READ_U16(data + 2) >> 6) & 0x003F;
fp@1715:     frame_number = (EC_READ_U16(data + 2) >> 12) & 0x000F;
fp@1715: 
fp@1715: #if EOE_DEBUG_LEVEL > 0
fp@1715:     EC_DBG("EoE RX fragment %i, offset %i, frame %i%s%s,"
fp@1715:            " %i octets\n", fragment_number, fragment_offset,
fp@1715:            frame_number,
fp@1715:            last_fragment ? ", last fragment" : "",
fp@1715:            time_appended ? ", + timestamp" : "",
fp@1715:            time_appended ? rec_size - 8 : rec_size - 4);
fp@1715: #endif
fp@1715: 
fp@1715: #if EOE_DEBUG_LEVEL > 1
fp@1715:     EC_DBG("");
fp@1715:     for (i = 0; i < rec_size - 4; i++) {
fp@1715:         printk("%02X ", data[i + 4]);
fp@1715:         if ((i + 1) % 16 == 0) {
fp@1715:             printk("\n");
fp@1715:             EC_DBG("");
fp@1715:         }
fp@1715:     }
fp@1715:     printk("\n");
fp@1715: #endif
fp@1715: 
fp@1715:     data_size = time_appended ? rec_size - 8 : rec_size - 4;
fp@1715: 
fp@1715:     if (!fragment_number) {
fp@1715:         if (eoe->rx_skb) {
fp@1715:             EC_WARN("EoE RX freeing old socket buffer...\n");
fp@1715:             dev_kfree_skb(eoe->rx_skb);
fp@1715:         }
fp@1715: 
fp@1715:         // new socket buffer
fp@1715:         if (!(eoe->rx_skb = dev_alloc_skb(fragment_offset * 32))) {
fp@1715:             if (printk_ratelimit())
fp@1715:                 EC_WARN("EoE RX low on mem. frame dropped.\n");
fp@1715:             eoe->stats.rx_dropped++;
fp@1715:             eoe->state = ec_eoe_state_tx_start;
fp@1715:             return;
fp@1715:         }
fp@1715: 
fp@1715:         eoe->rx_skb_offset = 0;
fp@1715:         eoe->rx_skb_size = fragment_offset * 32;
fp@1715:         eoe->rx_expected_fragment = 0;
fp@1715:     }
fp@1715:     else {
fp@1715:         if (!eoe->rx_skb) {
fp@1715:             eoe->stats.rx_dropped++;
fp@1715:             eoe->state = ec_eoe_state_tx_start;
fp@1715:             return;
fp@1715:         }
fp@1715: 
fp@1715:         offset = fragment_offset * 32;
fp@1715:         if (offset != eoe->rx_skb_offset ||
fp@1715:             offset + data_size > eoe->rx_skb_size ||
fp@1715:             fragment_number != eoe->rx_expected_fragment) {
fp@1715:             dev_kfree_skb(eoe->rx_skb);
fp@1715:             eoe->rx_skb = NULL;
fp@1715:             eoe->stats.rx_errors++;
fp@1715:             eoe->state = ec_eoe_state_tx_start;
fp@1715:             return;
fp@1715:         }
fp@1715:     }
fp@1715: 
fp@1715:     // copy fragment into socket buffer
fp@1715:     memcpy(skb_put(eoe->rx_skb, data_size), data + 4, data_size);
fp@1715:     eoe->rx_skb_offset += data_size;
fp@1715: 
fp@1715:     if (last_fragment) {
fp@1715:         // update statistics
fp@1715:         eoe->stats.rx_packets++;
fp@1715:         eoe->stats.rx_bytes += eoe->rx_skb->len;
fp@1716:         eoe->rx_counter += eoe->rx_skb->len;
fp@1715: 
fp@1715: #if EOE_DEBUG_LEVEL > 0
fp@1715:         EC_DBG("EoE RX frame completed with %u octets.\n",
fp@1715:                eoe->rx_skb->len);
fp@1715: #endif
fp@1715: 
fp@1715:         // pass socket buffer to network stack
fp@1715:         eoe->rx_skb->dev = eoe->dev;
fp@1715:         eoe->rx_skb->protocol = eth_type_trans(eoe->rx_skb, eoe->dev);
fp@1715:         eoe->rx_skb->ip_summed = CHECKSUM_UNNECESSARY;
fp@1715:         if (netif_rx(eoe->rx_skb)) {
fp@1715:             EC_WARN("EoE RX netif_rx failed.\n");
fp@1715:         }
fp@1715:         eoe->rx_skb = NULL;
fp@1715: 
fp@1715:         eoe->state = ec_eoe_state_tx_start;
fp@1715:     }
fp@1715:     else {
fp@1715:         eoe->rx_expected_fragment++;
fp@1715: #if EOE_DEBUG_LEVEL > 0
fp@1715:         EC_DBG("EoE RX expecting fragment %i\n",
fp@1715:                eoe->rx_expected_fragment);
fp@1715: #endif
fp@1715:         eoe->state = ec_eoe_state_rx_start;
fp@218:     }
fp@218: }
fp@218: 
fp@218: /*****************************************************************************/
fp@218: 
fp@218: /**
fp@218:    State: TX START.
fp@218:    Starts a new transmit sequence. If no data is available, a new receive
fp@218:    sequence is started instead.
fp@218: */
fp@218: 
fp@251: void ec_eoe_state_tx_start(ec_eoe_t *eoe /**< EoE handler */)
fp@218: {
fp@218: #if EOE_DEBUG_LEVEL > 0
fp@1716:     unsigned int wakeup = 0;
fp@218: #endif
fp@218: 
fp@1744:     if (eoe->slave->online_state == EC_SLAVE_OFFLINE ||
fp@1744:             !eoe->slave->master->main_device.link_state)
fp@261:         return;
fp@261: 
fp@218:     spin_lock_bh(&eoe->tx_queue_lock);
fp@218: 
fp@218:     if (!eoe->tx_queued_frames || list_empty(&eoe->tx_queue)) {
fp@218:         spin_unlock_bh(&eoe->tx_queue_lock);
fp@218:         // no data available.
fp@218:         // start a new receive immediately.
fp@218:         ec_eoe_state_rx_start(eoe);
fp@218:         return;
fp@218:     }
fp@218: 
fp@218:     // take the first frame out of the queue
fp@218:     eoe->tx_frame = list_entry(eoe->tx_queue.next, ec_eoe_frame_t, queue);
fp@218:     list_del(&eoe->tx_frame->queue);
fp@218:     if (!eoe->tx_queue_active &&
fp@218:         eoe->tx_queued_frames == EC_EOE_TX_QUEUE_SIZE / 2) {
fp@218:         netif_wake_queue(eoe->dev);
fp@218:         eoe->tx_queue_active = 1;
fp@218: #if EOE_DEBUG_LEVEL > 0
fp@218:         wakeup = 1;
fp@218: #endif
fp@218:     }
fp@218: 
fp@218:     eoe->tx_queued_frames--;
fp@218:     spin_unlock_bh(&eoe->tx_queue_lock);
fp@218: 
fp@218:     eoe->tx_frame_number++;
fp@218:     eoe->tx_frame_number %= 16;
fp@218:     eoe->tx_fragment_number = 0;
fp@218:     eoe->tx_offset = 0;
fp@218: 
fp@218:     if (ec_eoe_send(eoe)) {
fp@218:         dev_kfree_skb(eoe->tx_frame->skb);
fp@218:         kfree(eoe->tx_frame);
fp@218:         eoe->tx_frame = NULL;
fp@218:         eoe->stats.tx_errors++;
fp@218:         eoe->state = ec_eoe_state_rx_start;
fp@218:         return;
fp@218:     }
fp@218: 
fp@218: #if EOE_DEBUG_LEVEL > 0
fp@218:     if (wakeup) EC_DBG("waking up TX queue...\n");
fp@218: #endif
fp@218: 
fp@218:     eoe->state = ec_eoe_state_tx_sent;
fp@218: }
fp@218: 
fp@218: /*****************************************************************************/
fp@218: 
fp@218: /**
fp@218:    State: TX SENT.
fp@293:    Checks is the previous transmit datagram succeded and sends the next
fp@218:    fragment, if necessary.
fp@218: */
fp@218: 
fp@251: void ec_eoe_state_tx_sent(ec_eoe_t *eoe /**< EoE handler */)
fp@218: {
fp@1715:     if (eoe->datagram.state != EC_DATAGRAM_RECEIVED) {
fp@218:         eoe->stats.tx_errors++;
fp@218:         eoe->state = ec_eoe_state_rx_start;
fp@218:         return;
fp@218:     }
fp@218: 
fp@293:     if (eoe->datagram.working_counter != 1) {
fp@218:         eoe->stats.tx_errors++;
fp@218:         eoe->state = ec_eoe_state_rx_start;
fp@218:         return;
fp@218:     }
fp@218: 
fp@218:     // frame completely sent
fp@218:     if (eoe->tx_offset >= eoe->tx_frame->skb->len) {
fp@218:         eoe->stats.tx_packets++;
fp@218:         eoe->stats.tx_bytes += eoe->tx_frame->skb->len;
fp@1716:         eoe->tx_counter += eoe->tx_frame->skb->len;
fp@218:         dev_kfree_skb(eoe->tx_frame->skb);
fp@218:         kfree(eoe->tx_frame);
fp@218:         eoe->tx_frame = NULL;
fp@218:         eoe->state = ec_eoe_state_rx_start;
fp@218:     }
fp@218:     else { // send next fragment
fp@218:         if (ec_eoe_send(eoe)) {
fp@218:             dev_kfree_skb(eoe->tx_frame->skb);
fp@218:             kfree(eoe->tx_frame);
fp@218:             eoe->tx_frame = NULL;
fp@218:             eoe->stats.tx_errors++;
fp@218:             eoe->state = ec_eoe_state_rx_start;
fp@218:         }
fp@218:     }
fp@218: }
fp@218: 
fp@218: /******************************************************************************
fp@218:  *  NET_DEVICE functions
fp@218:  *****************************************************************************/
fp@203: 
fp@203: /**
fp@203:    Opens the virtual network device.
fp@203: */
fp@203: 
fp@203: int ec_eoedev_open(struct net_device *dev /**< EoE net_device */)
fp@203: {
fp@213:     ec_eoe_t *eoe = *((ec_eoe_t **) netdev_priv(dev));
fp@214:     ec_eoe_flush(eoe);
fp@212:     eoe->opened = 1;
fp@203:     netif_start_queue(dev);
fp@214:     eoe->tx_queue_active = 1;
fp@251:     EC_INFO("%s opened.\n", dev->name);
fp@1744:     ec_slave_request_state(eoe->slave, EC_SLAVE_STATE_OP);
fp@203:     return 0;
fp@203: }
fp@203: 
fp@203: /*****************************************************************************/
fp@203: 
fp@203: /**
fp@203:    Stops the virtual network device.
fp@203: */
fp@203: 
fp@203: int ec_eoedev_stop(struct net_device *dev /**< EoE net_device */)
fp@203: {
fp@213:     ec_eoe_t *eoe = *((ec_eoe_t **) netdev_priv(dev));
fp@203:     netif_stop_queue(dev);
fp@214:     eoe->tx_queue_active = 0;
fp@212:     eoe->opened = 0;
fp@214:     ec_eoe_flush(eoe);
fp@251:     EC_INFO("%s stopped.\n", dev->name);
fp@1744:     ec_slave_request_state(eoe->slave, EC_SLAVE_STATE_PREOP);
fp@203:     return 0;
fp@203: }
fp@203: 
fp@203: /*****************************************************************************/
fp@203: 
fp@203: /**
fp@203:    Transmits data via the virtual network device.
fp@203: */
fp@203: 
fp@203: int ec_eoedev_tx(struct sk_buff *skb, /**< transmit socket buffer */
fp@203:                  struct net_device *dev /**< EoE net_device */
fp@212:                 )
fp@212: {
fp@213:     ec_eoe_t *eoe = *((ec_eoe_t **) netdev_priv(dev));
fp@214:     ec_eoe_frame_t *frame;
fp@214: 
fp@217: #if 0
fp@217:     if (skb->len > eoe->slave->sii_tx_mailbox_size - 10) {
fp@214:         EC_WARN("EoE TX frame (%i octets) exceeds MTU. dropping.\n", skb->len);
fp@214:         dev_kfree_skb(skb);
fp@214:         eoe->stats.tx_dropped++;
fp@214:         return 0;
fp@214:     }
fp@217: #endif
fp@214: 
fp@214:     if (!(frame =
fp@214:           (ec_eoe_frame_t *) kmalloc(sizeof(ec_eoe_frame_t), GFP_ATOMIC))) {
fp@214:         if (printk_ratelimit())
fp@214:             EC_WARN("EoE TX: low on mem. frame dropped.\n");
fp@214:         return 1;
fp@214:     }
fp@214: 
fp@214:     frame->skb = skb;
fp@212: 
fp@212:     spin_lock_bh(&eoe->tx_queue_lock);
fp@214:     list_add_tail(&frame->queue, &eoe->tx_queue);
fp@218:     eoe->tx_queued_frames++;
fp@218:     if (eoe->tx_queued_frames == EC_EOE_TX_QUEUE_SIZE) {
fp@212:         netif_stop_queue(dev);
fp@214:         eoe->tx_queue_active = 0;
fp@214:     }
fp@212:     spin_unlock_bh(&eoe->tx_queue_lock);
fp@212: 
fp@215: #if EOE_DEBUG_LEVEL > 0
fp@214:     EC_DBG("EoE TX queued frame with %i octets (%i frames queued).\n",
fp@218:            skb->len, eoe->tx_queued_frames);
fp@214:     if (!eoe->tx_queue_active)
fp@214:         EC_WARN("EoE TX queue is now full.\n");
fp@215: #endif
fp@214: 
fp@203:     return 0;
fp@203: }
fp@203: 
fp@203: /*****************************************************************************/
fp@203: 
fp@203: /**
fp@203:    Gets statistics about the virtual network device.
fp@203: */
fp@203: 
fp@203: struct net_device_stats *ec_eoedev_stats(struct net_device *dev
fp@203:                                          /**< EoE net_device */)
fp@203: {
fp@213:     ec_eoe_t *eoe = *((ec_eoe_t **) netdev_priv(dev));
fp@212:     return &eoe->stats;
fp@212: }
fp@212: 
fp@212: /*****************************************************************************/