/*
|
* eth1394.h -- RTnet Driver for Ethernet emulation over FireWire
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* (adapted from Linux1394)
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*
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* Copyright (C) 2005 Zhang Yuchen <yuchen623@gmail.com>
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*
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* Mainly based on work by Emanuel Pirker and Andreas E. Bombe
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
|
|
#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/if_arp.h>
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#include <linux/if_ether.h>
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#include <linux/ip.h>
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#include <linux/in.h>
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#include <linux/bitops.h>
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#include <linux/uaccess.h>
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#include <net/arp.h>
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#define rtos_spinlock_t rtdm_lock_t
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#define nanosecs_abs_t nanosecs_t
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|
#include <rt_eth1394.h>
|
|
#include <rtnet_port.h>
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|
#include <ieee1394_types.h>
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#include <ieee1394_core.h>
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#include <ieee1394_transactions.h>
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#include <ieee1394.h>
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#include <highlevel.h>
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#include <iso.h>
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#define driver_name "RT-ETH1394"
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|
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#define ETH1394_PRINT_G(level, fmt, args...) \
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rtdm_printk(level "%s: " fmt, driver_name, ## args)
|
|
#define ETH1394_PRINT(level, dev_name, fmt, args...) \
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rtdm_printk(level "%s: %s: " fmt, driver_name, dev_name, ## args)
|
|
//#define ETH1394_DEBUG 1
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#ifdef ETH1394_DEBUG
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#define DEBUGP(fmt, args...) \
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rtdm_printk(KERN_ERR "%s:%s[%d]: " fmt "\n", driver_name, __FUNCTION__, __LINE__, ## args)
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#else
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#define DEBUGP(fmt, args...)
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#endif
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#define TRACE() rtdm_printk(KERN_ERR "%s:%s[%d] ---- TRACE\n", driver_name, __FUNCTION__, __LINE__)
|
|
/* Change this to IEEE1394_SPEED_S100 to make testing easier */
|
#define ETH1394_SPEED_DEF 0x03 /*IEEE1394_SPEED_MAX*/
|
|
/* For now, this needs to be 1500, so that XP works with us */
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#define ETH1394_DATA_LEN 1500/*ETH_DATA_LEN*/
|
|
struct fragment_info {
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struct list_head list;
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int offset;
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int len;
|
};
|
|
struct partial_datagram {
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struct list_head list;
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u16 dgl;
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u16 dg_size;
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u16 ether_type;
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struct rtskb *skb;
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char *pbuf;
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struct list_head frag_info;
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};
|
|
static const u16 eth1394_speedto_maxpayload[] = {
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/* S100, S200, S400, S800, S1600, S3200 */
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512, 1024, 2048, 4096, 4096, 4096
|
};
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static struct hpsb_highlevel eth1394_highlevel;
|
|
/* Use common.lf to determine header len */
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static const int hdr_type_len[] = {
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sizeof (struct eth1394_uf_hdr),
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sizeof (struct eth1394_ff_hdr),
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sizeof (struct eth1394_sf_hdr),
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sizeof (struct eth1394_sf_hdr)
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};
|
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/* The max_partial_datagrams parameter is the maximum number of fragmented
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* datagrams per node that eth1394 will keep in memory. Providing an upper
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* bound allows us to limit the amount of memory that partial datagrams
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* consume in the event that some partial datagrams are never completed. This
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* should probably change to a sysctl item or the like if possible.
|
*/
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static int max_partial_datagrams = 25;
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module_param(max_partial_datagrams, int, 0444);
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MODULE_PARM_DESC(max_partial_datagrams,
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"Maximum number of partially received fragmented datagrams "
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"(default = 25).");
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|
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static int eth1394_header(struct rtskb *skb, struct rtnet_device *dev,
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unsigned short type, void *daddr, void *saddr,
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unsigned len);
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static int eth1394_write(struct hpsb_host *host,struct hpsb_packet *packet, unsigned int length);
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|
static inline void purge_partial_datagram(struct list_head *old);
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static int eth1394_tx(struct rtskb *skb, struct rtnet_device *dev);
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static void eth1394_iso(struct hpsb_iso *iso, void *arg);
|
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/* Function for incoming 1394 packets */
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static struct hpsb_address_ops eth1394_ops = {
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.write = eth1394_write,
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};
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static void eth1394_add_host (struct hpsb_host *host);
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static void eth1394_remove_host (struct hpsb_host *host);
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static void eth1394_host_reset (struct hpsb_host *host);
|
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/* Ieee1394 highlevel driver functions */
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static struct hpsb_highlevel eth1394_highlevel = {
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.name = driver_name,
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.add_host = eth1394_add_host,
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.remove_host = eth1394_remove_host,
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.host_reset = eth1394_host_reset,
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};
|
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static void eth1394_iso_shutdown(struct eth1394_priv *priv)
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{
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priv->bc_state = ETHER1394_BC_CLOSED;
|
|
if (priv->iso != NULL) {
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//~ if (!in_interrupt())
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hpsb_iso_shutdown(priv->iso);
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priv->iso = NULL;
|
}
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}
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static int eth1394_init_bc(struct rtnet_device *dev)
|
{
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struct eth1394_priv *priv = (struct eth1394_priv *)dev->priv;
|
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/* First time sending? Need a broadcast channel for ARP and for
|
* listening on */
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if (priv->bc_state == ETHER1394_BC_CHECK) {
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quadlet_t bc;
|
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/* Get the local copy of the broadcast channel and check its
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* validity (the IRM should validate it for us) */
|
|
bc = priv->host->csr.broadcast_channel;
|
|
if ((bc & 0x80000000) != 0x80000000) { //used to be 0xc0000000
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/* broadcast channel not validated yet */
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ETH1394_PRINT(KERN_WARNING, dev->name,
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"Error BROADCAST_CHANNEL register valid "
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"bit not set, can't send IP traffic\n");
|
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eth1394_iso_shutdown(priv);
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|
return -EAGAIN;
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}
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if (priv->broadcast_channel != (bc & 0x3f)) {
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/* This really shouldn't be possible, but just in case
|
* the IEEE 1394 spec changes regarding broadcast
|
* channels in the future. */
|
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eth1394_iso_shutdown(priv);
|
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//~ if (in_interrupt())
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//~ return -EAGAIN;
|
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priv->broadcast_channel = bc & 0x3f;
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ETH1394_PRINT(KERN_INFO, dev->name,
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"Changing to broadcast channel %d...\n",
|
priv->broadcast_channel);
|
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priv->iso = hpsb_iso_recv_init(priv->host, 16 * 4096,
|
16, priv->broadcast_channel, HPSB_ISO_DMA_PACKET_PER_BUFFER,
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1, eth1394_iso, 0, "eth1394_iso", IEEE1394_PRIORITY_HIGHEST);
|
|
if (priv->iso == NULL) {
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ETH1394_PRINT(KERN_ERR, dev->name,
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"failed to change broadcast "
|
"channel\n");
|
return -EAGAIN;
|
}
|
}
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if (hpsb_iso_recv_start(priv->iso, -1, (1 << 3), -1) < 0) {
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ETH1394_PRINT(KERN_ERR, dev->name,
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"Could not start data stream reception\n");
|
|
eth1394_iso_shutdown(priv);
|
|
return -EAGAIN;
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}
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priv->bc_state = ETHER1394_BC_OPENED;
|
}
|
|
return 0;
|
}
|
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static int eth1394_open (struct rtnet_device *dev)
|
{
|
struct eth1394_priv *priv = (struct eth1394_priv *)dev->priv;
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rtdm_lockctx_t context;
|
int ret;
|
|
/* Something bad happened, don't even try */
|
if (priv->bc_state == ETHER1394_BC_CLOSED)
|
{
|
return -EAGAIN;
|
}
|
rtdm_lock_get_irqsave(&priv->lock, context);
|
ret = eth1394_init_bc(dev);
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rtdm_lock_put_irqrestore(&priv->lock, context);
|
|
if (ret)
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return ret;
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rt_stack_connect(dev,&STACK_manager);
|
rtnetif_start_queue (dev);
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return 0;
|
}
|
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static int eth1394_stop (struct rtnet_device *dev)
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{
|
rtnetif_stop_queue (dev);
|
rt_stack_disconnect(dev);
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return 0;
|
}
|
|
/* Return statistics to the caller */
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static struct net_device_stats *eth1394_stats (struct rtnet_device *dev)
|
{
|
return &(((struct eth1394_priv *)dev->priv)->stats);
|
}
|
|
static inline void eth1394_register_limits(int nodeid, u16 maxpayload,
|
unsigned char sspd,
|
struct eth1394_priv *priv)
|
{
|
|
if (nodeid < 0 || nodeid >= ALL_NODES) {
|
ETH1394_PRINT_G (KERN_ERR, "Cannot register invalid nodeid %d\n", nodeid);
|
return;
|
}
|
|
priv->maxpayload[nodeid] = maxpayload;
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priv->sspd[nodeid] = sspd;
|
priv->maxpayload[ALL_NODES] = min(priv->maxpayload[ALL_NODES], maxpayload);
|
priv->sspd[ALL_NODES] = min(priv->sspd[ALL_NODES], sspd);
|
|
return;
|
}
|
|
|
static void eth1394_reset_priv (struct rtnet_device *dev, int set_mtu)
|
{
|
rtdm_lockctx_t context;
|
int i;
|
struct eth1394_priv *priv = (struct eth1394_priv *)dev->priv;
|
struct hpsb_host *host = priv->host;
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int phy_id = NODEID_TO_NODE(host->node_id);
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u16 maxpayload = 1 << (host->csr.max_rec + 1);
|
|
rtdm_lock_get_irqsave(&priv->lock, context);
|
/* Clear the speed/payload/offset tables */
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memset (priv->maxpayload, 0, sizeof (priv->maxpayload));
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memset (priv->sspd, 0, sizeof (priv->sspd));
|
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priv->sspd[ALL_NODES] = ETH1394_SPEED_DEF;
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priv->maxpayload[ALL_NODES] = eth1394_speedto_maxpayload[priv->sspd[ALL_NODES]];
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priv->bc_state = ETHER1394_BC_CHECK;
|
|
/* Register our limits now */
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eth1394_register_limits(phy_id, maxpayload,
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host->speed_map[(phy_id << 6) + phy_id], priv);
|
|
/* We'll use our maxpayload as the default mtu */
|
if (set_mtu) {
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dev->mtu = min(ETH1394_DATA_LEN, (int)(priv->maxpayload[phy_id] -
|
(sizeof(union eth1394_hdr) + ETHER1394_GASP_OVERHEAD)));
|
|
//~ /* Set our hardware address while we're at it */
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//~ *(u64*)dev->dev_addr = guid;
|
//~ *(u64*)dev->broadcast = ~0x0ULL;
|
*(u16*)dev->dev_addr = LOCAL_BUS | phy_id; //we directly use FireWire address for our MAC address
|
*(u16*)dev->broadcast = LOCAL_BUS | ALL_NODES;
|
}
|
|
rtdm_lock_put_irqrestore(&priv->lock, context);
|
|
for (i = 0; i < ALL_NODES; i++) {
|
struct list_head *lh, *n;
|
|
rtdm_lock_get_irqsave(&priv->pdg[i].lock, context);
|
if (!set_mtu) {
|
list_for_each_safe(lh, n, &priv->pdg[i].list) {
|
//~ purge_partial_datagram(lh);
|
}
|
}
|
INIT_LIST_HEAD(&(priv->pdg[i].list));
|
priv->pdg[i].sz = 0;
|
rtdm_lock_put_irqrestore(&priv->pdg[i].lock, context);
|
}
|
|
}
|
|
static void eth1394_add_host (struct hpsb_host *host)
|
{
|
int i;
|
struct host_info *hi = NULL;
|
|
//*******RTnet********
|
struct rtnet_device *dev = NULL;
|
//
|
struct eth1394_priv *priv;
|
|
/* We should really have our own alloc_hpsbdev() function in
|
* net_init.c instead of calling the one for ethernet then hijacking
|
* it for ourselves. That way we'd be a real networking device. */
|
|
//******RTnet******
|
|
dev = rt_alloc_etherdev(sizeof (struct eth1394_priv),
|
RX_RING_SIZE * 2 + TX_RING_SIZE);
|
if (dev == NULL) {
|
ETH1394_PRINT_G (KERN_ERR, "Out of memory trying to allocate "
|
"etherdevice for IEEE 1394 device\n");
|
goto free_dev;
|
}
|
rtdev_alloc_name(dev, "rteth%d");
|
memset(dev->priv, 0, sizeof(struct eth1394_priv));
|
rt_rtdev_connect(dev, &RTDEV_manager);
|
|
//dev->init = eth1394_init_dev;
|
|
dev->vers = RTDEV_VERS_2_0;
|
dev->open = eth1394_open;
|
dev->hard_start_xmit = eth1394_tx;
|
dev->stop = eth1394_stop;
|
dev->hard_header = eth1394_header;
|
dev->get_stats = eth1394_stats;
|
dev->flags = IFF_BROADCAST | IFF_MULTICAST;
|
dev->addr_len = ETH_ALEN;
|
dev->hard_header_len = ETH_HLEN;
|
dev->type = ARPHRD_IEEE1394;
|
|
//rtdev->do_ioctl = NULL;
|
priv = (struct eth1394_priv *)dev->priv;
|
|
rtdm_lock_init(&priv->lock);
|
priv->host = host;
|
|
for (i = 0; i < ALL_NODES; i++) {
|
rtdm_lock_init(&priv->pdg[i].lock);
|
INIT_LIST_HEAD(&priv->pdg[i].list);
|
priv->pdg[i].sz = 0;
|
}
|
|
hi = hpsb_create_hostinfo(ð1394_highlevel, host, sizeof(*hi));
|
if (hi == NULL) {
|
ETH1394_PRINT_G (KERN_ERR, "Out of memory trying to create "
|
"hostinfo for IEEE 1394 device\n");
|
goto free_hi;
|
}
|
|
if(rt_register_rtnetdev(dev))
|
{
|
ETH1394_PRINT (KERN_ERR, dev->name, "Error registering network driver\n");
|
goto free_hi;
|
}
|
|
ETH1394_PRINT (KERN_ERR, dev->name, "IEEE-1394 IPv4 over 1394 Ethernet\n");
|
|
hi->host = host;
|
hi->dev = dev;
|
|
eth1394_reset_priv (dev, 1);
|
|
/* Ignore validity in hopes that it will be set in the future. It'll
|
* be checked when the eth device is opened. */
|
priv->broadcast_channel = host->csr.broadcast_channel & 0x3f;
|
|
priv->iso = hpsb_iso_recv_init(host, (ETHER1394_GASP_BUFFERS * 2 *
|
2048), // XXX workaround for limitation in rawiso
|
//(1 << (host->csr.max_rec + 1))),
|
ETHER1394_GASP_BUFFERS,
|
priv->broadcast_channel,
|
HPSB_ISO_DMA_PACKET_PER_BUFFER,
|
1, eth1394_iso, 0, "eth1394_iso", IEEE1394_PRIORITY_HIGHEST);
|
|
|
|
if (priv->iso == NULL) {
|
ETH1394_PRINT(KERN_ERR, dev->name,
|
"Could not allocate isochronous receive context "
|
"for the broadcast channel\n");
|
priv->bc_state = ETHER1394_BC_ERROR;
|
goto unregister_dev;
|
} else {
|
if (hpsb_iso_recv_start(priv->iso, -1, (1 << 3), -1) < 0){
|
priv->bc_state = ETHER1394_BC_STOPPED;
|
goto unregister_dev;
|
}
|
else
|
priv->bc_state = ETHER1394_BC_RUNNING;
|
}
|
|
hpsb_register_addrspace(ð1394_highlevel, host, ð1394_ops, ETHER1394_REGION_ADDR,
|
ETHER1394_REGION_ADDR_END);
|
|
return;
|
|
unregister_dev:
|
rt_unregister_rtnetdev(dev);
|
free_hi:
|
hpsb_destroy_hostinfo(ð1394_highlevel, host);
|
free_dev:
|
rtdev_free(dev);
|
|
return;
|
}
|
|
static void eth1394_remove_host (struct hpsb_host *host)
|
{
|
struct host_info *hi = hpsb_get_hostinfo(ð1394_highlevel, host);
|
|
if (hi != NULL) {
|
struct eth1394_priv *priv = (struct eth1394_priv *)hi->dev->priv;
|
|
eth1394_iso_shutdown(priv);
|
|
if (hi->dev) {
|
rt_stack_disconnect(hi->dev);
|
rt_unregister_rtnetdev (hi->dev);
|
rtdev_free(hi->dev);
|
}
|
}
|
return;
|
}
|
|
static void eth1394_host_reset (struct hpsb_host *host)
|
{
|
struct host_info *hi = hpsb_get_hostinfo(ð1394_highlevel, host);
|
struct rtnet_device *dev;
|
|
/* This can happen for hosts that we don't use */
|
if (hi == NULL)
|
return;
|
|
dev = hi->dev;
|
|
/* Reset our private host data, but not our mtu */
|
rtnetif_stop_queue (dev);
|
eth1394_reset_priv (dev, 1);
|
rtnetif_wake_queue (dev);
|
}
|
|
|
/******************************************
|
* HW Header net device functions
|
******************************************/
|
/* These functions have been adapted from net/ethernet/eth.c */
|
|
|
/* Create a fake MAC header for an arbitrary protocol layer.
|
* saddr=NULL means use device source address
|
* daddr=NULL means leave destination address (eg unresolved arp). */
|
static int eth1394_header(struct rtskb *skb, struct rtnet_device *dev,
|
unsigned short type, void *daddr, void *saddr,
|
unsigned len)
|
{
|
struct ethhdr *eth = (struct ethhdr *)rtskb_push(skb,ETH_HLEN);
|
memset(eth, 0, sizeof(*eth));
|
|
eth->h_proto = htons(type);
|
|
if (saddr)
|
memcpy(eth->h_source, saddr, sizeof(nodeid_t));
|
else
|
memcpy(eth->h_source, dev->dev_addr, sizeof(nodeid_t));
|
|
if (dev->flags & (IFF_LOOPBACK|IFF_NOARP))
|
{
|
memset(eth->h_dest, 0, dev->addr_len);
|
return(dev->hard_header_len);
|
}
|
|
if (daddr)
|
{
|
memcpy(eth->h_dest,daddr, sizeof(nodeid_t));
|
return dev->hard_header_len;
|
}
|
|
return -dev->hard_header_len;
|
|
}
|
|
|
/******************************************
|
* Datagram reception code
|
******************************************/
|
|
/* Copied from net/ethernet/eth.c */
|
static inline u16 eth1394_type_trans(struct rtskb *skb,
|
struct rtnet_device *dev)
|
{
|
struct ethhdr *eth;
|
unsigned char *rawp;
|
|
skb->mac.raw = skb->data;
|
rtskb_pull (skb, ETH_HLEN);
|
eth = (struct ethhdr*)skb->mac.raw;
|
|
if (*eth->h_dest & 1) {
|
if (memcmp(eth->h_dest, dev->broadcast, dev->addr_len)==0)
|
skb->pkt_type = PACKET_BROADCAST;
|
} else {
|
if (memcmp(eth->h_dest, dev->dev_addr, dev->addr_len))
|
skb->pkt_type = PACKET_OTHERHOST;
|
}
|
|
if (ntohs (eth->h_proto) >= 1536)
|
return eth->h_proto;
|
|
rawp = skb->data;
|
|
if (*(unsigned short *)rawp == 0xFFFF)
|
return htons (ETH_P_802_3);
|
|
return htons (ETH_P_802_2);
|
}
|
|
/* Parse an encapsulated IP1394 header into an ethernet frame packet.
|
* We also perform ARP translation here, if need be. */
|
static inline u16 eth1394_parse_encap(struct rtskb *skb,
|
struct rtnet_device *dev,
|
nodeid_t srcid, nodeid_t destid,
|
u16 ether_type)
|
{
|
struct eth1394_priv *priv = (struct eth1394_priv *)dev->priv;
|
unsigned short ret = 0;
|
|
/* If this is an ARP packet, convert it. First, we want to make
|
* use of some of the fields, since they tell us a little bit
|
* about the sending machine. */
|
if (ether_type == __constant_htons (ETH_P_ARP)) {
|
rtdm_lockctx_t context;
|
struct eth1394_arp *arp1394 =
|
(struct eth1394_arp*)((u8 *)skb->data);
|
struct arphdr *arp =
|
(struct arphdr *)((u8 *)skb->data);
|
unsigned char *arp_ptr = (unsigned char *)(arp + 1);
|
u8 max_rec = min(priv->host->csr.max_rec,
|
(u8)(arp1394->max_rec));
|
int sspd = arp1394->sspd;
|
u16 maxpayload;
|
/* Sanity check. MacOSX seems to be sending us 131 in this
|
* field (atleast on my Panther G5). Not sure why. */
|
if (sspd > 5 || sspd < 0)
|
sspd = 0;
|
|
maxpayload = min(eth1394_speedto_maxpayload[sspd], (u16)(1 << (max_rec + 1)));
|
|
|
|
/* Update our speed/payload/fifo_offset table */
|
rtdm_lock_get_irqsave(&priv->lock, context);
|
eth1394_register_limits(NODEID_TO_NODE(srcid), maxpayload,
|
arp1394->sspd,
|
priv);
|
rtdm_lock_put_irqrestore(&priv->lock, context);
|
|
/* Now that we're done with the 1394 specific stuff, we'll
|
* need to alter some of the data. Believe it or not, all
|
* that needs to be done is sender_IP_address needs to be
|
* moved, the destination hardware address get stuffed
|
* in and the hardware address length set to 8.
|
*
|
* IMPORTANT: The code below overwrites 1394 specific data
|
* needed above data so keep the call to
|
* eth1394_register_limits() before munging the data for the
|
* higher level IP stack. */
|
|
arp->ar_hln = ETH_ALEN;
|
arp_ptr += arp->ar_hln; /* skip over sender unique id */
|
*(u32*)arp_ptr = arp1394->sip; /* move sender IP addr */
|
arp_ptr += arp->ar_pln; /* skip over sender IP addr */
|
|
if (arp->ar_op == 1)
|
/* just set ARP req target unique ID to 0 */
|
memset(arp_ptr, 0, ETH_ALEN);
|
else
|
memcpy(arp_ptr, dev->dev_addr, ETH_ALEN);
|
}
|
|
/* Now add the ethernet header. */
|
//no need to add ethernet header now, since we did not get rid of it on the sending side
|
if (dev->hard_header (skb, dev, __constant_ntohs (ether_type),
|
&destid, &srcid, skb->len) >= 0)
|
ret = eth1394_type_trans(skb, dev);
|
|
return ret;
|
}
|
|
static inline int fragment_overlap(struct list_head *frag_list, int offset, int len)
|
{
|
struct list_head *lh;
|
struct fragment_info *fi;
|
|
list_for_each(lh, frag_list) {
|
fi = list_entry(lh, struct fragment_info, list);
|
|
if ( ! ((offset > (fi->offset + fi->len - 1)) ||
|
((offset + len - 1) < fi->offset)))
|
return 1;
|
}
|
return 0;
|
}
|
|
static inline struct list_head *find_partial_datagram(struct list_head *pdgl, int dgl)
|
{
|
struct list_head *lh;
|
struct partial_datagram *pd;
|
|
list_for_each(lh, pdgl) {
|
pd = list_entry(lh, struct partial_datagram, list);
|
if (pd->dgl == dgl)
|
return lh;
|
}
|
return NULL;
|
}
|
|
/* Assumes that new fragment does not overlap any existing fragments */
|
static inline int new_fragment(struct list_head *frag_info, int offset, int len)
|
{
|
struct list_head *lh;
|
struct fragment_info *fi, *fi2, *new;
|
|
list_for_each(lh, frag_info) {
|
fi = list_entry(lh, struct fragment_info, list);
|
if ((fi->offset + fi->len) == offset) {
|
/* The new fragment can be tacked on to the end */
|
fi->len += len;
|
/* Did the new fragment plug a hole? */
|
fi2 = list_entry(lh->next, struct fragment_info, list);
|
if ((fi->offset + fi->len) == fi2->offset) {
|
/* glue fragments together */
|
fi->len += fi2->len;
|
list_del(lh->next);
|
kfree(fi2);
|
}
|
return 0;
|
} else if ((offset + len) == fi->offset) {
|
/* The new fragment can be tacked on to the beginning */
|
fi->offset = offset;
|
fi->len += len;
|
/* Did the new fragment plug a hole? */
|
fi2 = list_entry(lh->prev, struct fragment_info, list);
|
if ((fi2->offset + fi2->len) == fi->offset) {
|
/* glue fragments together */
|
fi2->len += fi->len;
|
list_del(lh);
|
kfree(fi);
|
}
|
return 0;
|
} else if (offset > (fi->offset + fi->len)) {
|
break;
|
} else if ((offset + len) < fi->offset) {
|
lh = lh->prev;
|
break;
|
}
|
}
|
|
new = kmalloc(sizeof(struct fragment_info), GFP_ATOMIC);
|
if (!new)
|
return -ENOMEM;
|
|
new->offset = offset;
|
new->len = len;
|
|
list_add(&new->list, lh);
|
|
return 0;
|
}
|
|
static inline int new_partial_datagram(struct rtnet_device *dev,
|
struct list_head *pdgl, int dgl,
|
int dg_size, char *frag_buf,
|
int frag_off, int frag_len)
|
{
|
struct partial_datagram *new;
|
struct eth1394_priv *priv = (struct eth1394_priv *)dev->priv;
|
|
new = kmalloc(sizeof(struct partial_datagram), GFP_ATOMIC);
|
if (!new)
|
return -ENOMEM;
|
|
INIT_LIST_HEAD(&new->frag_info);
|
|
if (new_fragment(&new->frag_info, frag_off, frag_len) < 0) {
|
kfree(new);
|
return -ENOMEM;
|
}
|
|
new->dgl = dgl;
|
new->dg_size = dg_size;
|
|
new->skb = rtnetdev_alloc_rtskb(dev, dg_size + dev->hard_header_len + 15);
|
if (!new->skb) {
|
struct fragment_info *fi = list_entry(new->frag_info.next,
|
struct fragment_info,
|
list);
|
kfree(fi);
|
kfree(new);
|
return -ENOMEM;
|
}
|
|
rtskb_reserve(new->skb, (dev->hard_header_len + 15) & ~15);
|
new->pbuf = rtskb_put(new->skb, dg_size);
|
memcpy(new->pbuf + frag_off, frag_buf, frag_len);
|
|
list_add(&new->list, pdgl);
|
|
return 0;
|
}
|
|
static inline int update_partial_datagram(struct list_head *pdgl, struct list_head *lh,
|
char *frag_buf, int frag_off, int frag_len)
|
{
|
struct partial_datagram *pd = list_entry(lh, struct partial_datagram, list);
|
|
if (new_fragment(&pd->frag_info, frag_off, frag_len) < 0) {
|
return -ENOMEM;
|
}
|
|
memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
|
|
/* Move list entry to beginnig of list so that oldest partial
|
* datagrams percolate to the end of the list */
|
list_del(lh);
|
list_add(lh, pdgl);
|
|
return 0;
|
}
|
|
static inline void purge_partial_datagram(struct list_head *old)
|
{
|
struct partial_datagram *pd = list_entry(old, struct partial_datagram, list);
|
struct list_head *lh, *n;
|
|
list_for_each_safe(lh, n, &pd->frag_info) {
|
struct fragment_info *fi = list_entry(lh, struct fragment_info, list);
|
list_del(lh);
|
kfree(fi);
|
}
|
list_del(old);
|
kfree_rtskb(pd->skb);
|
kfree(pd);
|
}
|
|
static inline int is_datagram_complete(struct list_head *lh, int dg_size)
|
{
|
struct partial_datagram *pd = list_entry(lh, struct partial_datagram, list);
|
struct fragment_info *fi = list_entry(pd->frag_info.next,
|
struct fragment_info, list);
|
|
return (fi->len == dg_size);
|
}
|
|
|
|
|
/* Packet reception. We convert the IP1394 encapsulation header to an
|
* ethernet header, and fill it with some of our other fields. This is
|
* an incoming packet from the 1394 bus. */
|
static int eth1394_data_handler(struct rtnet_device *dev, int srcid, int destid,
|
char *buf, int len, nanosecs_abs_t time_stamp)
|
{
|
struct rtskb *skb;
|
rtdm_lockctx_t context;
|
struct eth1394_priv *priv;
|
union eth1394_hdr *hdr = (union eth1394_hdr *)buf;
|
u16 ether_type = 0; /* initialized to clear warning */
|
int hdr_len;
|
|
//~ nanosecs_abs_t time_stamp = rtdm_clock_read();
|
|
priv = (struct eth1394_priv *)dev->priv;
|
|
/* First, did we receive a fragmented or unfragmented datagram? */
|
hdr->words.word1 = ntohs(hdr->words.word1);
|
|
hdr_len = hdr_type_len[hdr->common.lf];
|
|
if (hdr->common.lf == ETH1394_HDR_LF_UF) {
|
DEBUGP("a single datagram has been received\n");
|
/* An unfragmented datagram has been received by the ieee1394
|
* bus. Build an skbuff around it so we can pass it to the
|
* high level network layer. */
|
|
//~ if(rtpkb_acquire((struct rtpkb*)packet, &priv->skb_pool)){
|
//~ HPSB_PRINT (KERN_ERR, "eth1394 rx: low on mem\n");
|
//~ priv->stats.rx_dropped++;
|
//~ return -1;
|
//~ }
|
|
skb = rtnetdev_alloc_rtskb(dev, len + dev->hard_header_len + 15);
|
if (!skb) {
|
ETH1394_PRINT_G(KERN_ERR, "eth1394 rx: low on mem\n");
|
priv->stats.rx_dropped++;
|
return -1;
|
}
|
//~ skb = (struct rtskb *)packet;//we can do this, because these two belong to the same common object, rtpkb.
|
//~ rtpkb_put(skb, len-hdr_len);
|
//~ skb->data = (u8 *)packet->data + hdr_len; //we jump over the 1394-specific fragment overhead
|
//~ rtskb_put(skb, );
|
rtskb_reserve(skb, (dev->hard_header_len + 15) & ~15);//we reserve the space to put in fake MAC address
|
memcpy(rtskb_put(skb, len - hdr_len), buf + hdr_len, len - hdr_len);
|
ether_type = hdr->uf.ether_type;
|
} else {
|
/* A datagram fragment has been received, now the fun begins. */
|
struct list_head *pdgl, *lh;
|
struct partial_datagram *pd;
|
int fg_off;
|
int fg_len = len - hdr_len;
|
int dg_size;
|
int dgl;
|
int retval;
|
int sid = NODEID_TO_NODE(srcid);
|
struct pdg_list *pdg = &(priv->pdg[sid]);
|
|
DEBUGP("a datagram fragment has been received\n");
|
hdr->words.word3 = ntohs(hdr->words.word3);
|
/* The 4th header word is reserved so no need to do ntohs() */
|
|
if (hdr->common.lf == ETH1394_HDR_LF_FF) {
|
//first fragment
|
ether_type = hdr->ff.ether_type;
|
dgl = hdr->ff.dgl;
|
dg_size = hdr->ff.dg_size + 1;
|
fg_off = 0;
|
} else {
|
hdr->words.word2 = ntohs(hdr->words.word2);
|
dgl = hdr->sf.dgl;
|
dg_size = hdr->sf.dg_size + 1;
|
fg_off = hdr->sf.fg_off;
|
}
|
rtdm_lock_get_irqsave(&pdg->lock, context);
|
|
pdgl = &(pdg->list);
|
lh = find_partial_datagram(pdgl, dgl);
|
|
if (lh == NULL) {
|
if (pdg->sz == max_partial_datagrams) {
|
/* remove the oldest */
|
purge_partial_datagram(pdgl->prev);
|
pdg->sz--;
|
}
|
|
retval = new_partial_datagram(dev, pdgl, dgl, dg_size,
|
buf + hdr_len, fg_off,
|
fg_len);
|
if (retval < 0) {
|
rtdm_lock_put_irqrestore(&pdg->lock, context);
|
goto bad_proto;
|
}
|
pdg->sz++;
|
lh = find_partial_datagram(pdgl, dgl);
|
} else {
|
struct partial_datagram *pd;
|
|
pd = list_entry(lh, struct partial_datagram, list);
|
|
if (fragment_overlap(&pd->frag_info, fg_off, fg_len)) {
|
/* Overlapping fragments, obliterate old
|
* datagram and start new one. */
|
purge_partial_datagram(lh);
|
retval = new_partial_datagram(dev, pdgl, dgl,
|
dg_size,
|
buf + hdr_len,
|
fg_off, fg_len);
|
if (retval < 0) {
|
pdg->sz--;
|
rtdm_lock_put_irqrestore(&pdg->lock, context);
|
goto bad_proto;
|
}
|
} else {
|
retval = update_partial_datagram(pdgl, lh,
|
buf + hdr_len,
|
fg_off, fg_len);
|
if (retval < 0) {
|
/* Couldn't save off fragment anyway
|
* so might as well obliterate the
|
* datagram now. */
|
purge_partial_datagram(lh);
|
pdg->sz--;
|
rtdm_lock_put_irqrestore(&pdg->lock, context);
|
goto bad_proto;
|
}
|
} /* fragment overlap */
|
} /* new datagram or add to existing one */
|
|
pd = list_entry(lh, struct partial_datagram, list);
|
|
if (hdr->common.lf == ETH1394_HDR_LF_FF) {
|
pd->ether_type = ether_type;
|
}
|
|
if (is_datagram_complete(lh, dg_size)) {
|
ether_type = pd->ether_type;
|
pdg->sz--;
|
//skb = skb_get(pd->skb);
|
skb = pd->skb;
|
purge_partial_datagram(lh);
|
rtdm_lock_put_irqrestore(&pdg->lock, context);
|
} else {
|
/* Datagram is not complete, we're done for the
|
* moment. */
|
rtdm_lock_put_irqrestore(&pdg->lock, context);
|
return 0;
|
}
|
} /* unframgented datagram or fragmented one */
|
|
/* Write metadata, and then pass to the receive level */
|
skb->ip_summed = CHECKSUM_UNNECESSARY; /* don't check it */
|
|
/* Parse the encapsulation header. This actually does the job of
|
* converting to an ethernet frame header, aswell as arp
|
* conversion if needed. ARP conversion is easier in this
|
* direction, since we are using ethernet as our backend. */
|
skb->protocol = eth1394_parse_encap(skb, dev, srcid, destid,
|
ether_type);
|
|
|
rtdm_lock_get_irqsave(&priv->lock, context);
|
if (!skb->protocol) {
|
DEBUG_PRINT("pointer to %s(%s)%d\n",__FILE__,__FUNCTION__,__LINE__);
|
priv->stats.rx_errors++;
|
priv->stats.rx_dropped++;
|
//dev_kfree_skb_any(skb);
|
kfree_rtskb(skb);
|
goto bad_proto;
|
}
|
|
skb->time_stamp = time_stamp;
|
/*if (netif_rx(skb) == NET_RX_DROP) {
|
priv->stats.rx_errors++;
|
priv->stats.rx_dropped++;
|
goto bad_proto;
|
}*/
|
rtnetif_rx(skb);//finally, we deliver the packet
|
|
/* Statistics */
|
priv->stats.rx_packets++;
|
priv->stats.rx_bytes += skb->len;
|
rt_mark_stack_mgr(dev);
|
|
bad_proto:
|
if (rtnetif_queue_stopped(dev))
|
rtnetif_wake_queue(dev);
|
rtdm_lock_put_irqrestore(&priv->lock, context);
|
|
//dev->last_rx = jiffies;
|
|
return 0;
|
}
|
|
|
static int eth1394_write(struct hpsb_host *host, struct hpsb_packet *packet, unsigned int length)
|
{
|
struct host_info *hi = hpsb_get_hostinfo(ð1394_highlevel, host);
|
int ret;
|
|
if (hi == NULL) {
|
ETH1394_PRINT_G(KERN_ERR, "Could not find net device for host %s\n",
|
host->driver->name);
|
return RCODE_ADDRESS_ERROR;
|
}
|
|
//we need to parse the packet now
|
ret = eth1394_data_handler(hi->dev, packet->header[1]>>16, //source id
|
packet->header[0]>>16, //dest id
|
(char *)packet->data, //data
|
packet->data_size, packet->time_stamp);
|
//we only get the request packet, serve it, but dont free it, since it does not belong to us!!!!
|
|
if(ret)
|
return RCODE_ADDRESS_ERROR;
|
else
|
return RCODE_COMPLETE;
|
}
|
|
|
/**
|
* callback function for broadcast channel
|
* called from hpsb_iso_wake( )
|
*/
|
static void eth1394_iso(struct hpsb_iso *iso, void *arg)
|
{
|
quadlet_t *data;
|
char *buf;
|
struct rtnet_device *dev;
|
unsigned int len;
|
u32 specifier_id;
|
u16 source_id;
|
int i;
|
int nready;
|
|
struct host_info *hi = hpsb_get_hostinfo(ð1394_highlevel, iso->host);
|
if (hi == NULL) {
|
ETH1394_PRINT_G(KERN_ERR, "Could not find net device for host %s\n",
|
iso->host->driver->name);
|
return;
|
}
|
|
dev = hi->dev;
|
|
nready = hpsb_iso_n_ready(iso);
|
for (i = 0; i < nready; i++) {
|
struct hpsb_iso_packet_info *info =
|
&iso->infos[(iso->first_packet + i) % iso->buf_packets];
|
data = (quadlet_t*) (iso->data_buf.kvirt + info->offset);
|
|
/* skip over GASP header */
|
buf = (char *)data + 8;
|
len = info->len - 8;
|
|
specifier_id = (((be32_to_cpu(data[0]) & 0xffff) << 8) |
|
((be32_to_cpu(data[1]) & 0xff000000) >> 24));
|
source_id = be32_to_cpu(data[0]) >> 16;
|
|
if (info->channel != (iso->host->csr.broadcast_channel & 0x3f) ||
|
specifier_id != ETHER1394_GASP_SPECIFIER_ID) {
|
/* This packet is not for us */
|
continue;
|
}
|
eth1394_data_handler(dev, source_id, LOCAL_BUS | ALL_NODES,
|
buf, len, rtdm_clock_read());
|
}
|
|
hpsb_iso_recv_release_packets(iso, i);
|
|
//dev->last_rx = jiffies;
|
}
|
|
/******************************************
|
* Datagram transmission code
|
******************************************/
|
|
/* Convert a standard ARP packet to 1394 ARP. The first 8 bytes (the entire
|
* arphdr) is the same format as the ip1394 header, so they overlap. The rest
|
* needs to be munged a bit. The remainder of the arphdr is formatted based
|
* on hwaddr len and ipaddr len. We know what they'll be, so it's easy to
|
* judge.
|
*
|
* Now that the EUI is used for the hardware address all we need to do to make
|
* this work for 1394 is to insert 2 quadlets that contain max_rec size,
|
* speed, and unicast FIFO address information between the sender_unique_id
|
* and the IP addresses.
|
*/
|
|
//we dont need the EUI id now. fifo_hi should contain the bus id and node id.
|
//fifo_lo should contain the highest 32 bits of in-node address.
|
static inline void eth1394_arp_to_1394arp(struct rtskb *skb,
|
struct rtnet_device *dev)
|
{
|
struct eth1394_priv *priv = (struct eth1394_priv *)(dev->priv);
|
u16 phy_id = NODEID_TO_NODE(priv->host->node_id);
|
|
struct arphdr *arp = (struct arphdr *)skb->data;
|
unsigned char *arp_ptr = (unsigned char *)(arp + 1);
|
struct eth1394_arp *arp1394 = (struct eth1394_arp *)skb->data;
|
|
arp1394->hw_addr_len = 6;
|
arp1394->sip = *(u32*)(arp_ptr + ETH_ALEN);
|
arp1394->max_rec = priv->host->csr.max_rec;
|
arp1394->sspd = priv->sspd[phy_id];
|
|
return;
|
}
|
|
/* We need to encapsulate the standard header with our own. We use the
|
* ethernet header's proto for our own. */
|
static inline unsigned int eth1394_encapsulate_prep(unsigned int max_payload,
|
int proto,
|
union eth1394_hdr *hdr,
|
u16 dg_size, u16 dgl)
|
{
|
unsigned int adj_max_payload = max_payload - hdr_type_len[ETH1394_HDR_LF_UF];
|
|
/* Does it all fit in one packet? */
|
if (dg_size <= adj_max_payload) {
|
hdr->uf.lf = ETH1394_HDR_LF_UF;
|
hdr->uf.ether_type = proto;
|
} else {
|
hdr->ff.lf = ETH1394_HDR_LF_FF;
|
hdr->ff.ether_type = proto;
|
hdr->ff.dg_size = dg_size - 1;
|
hdr->ff.dgl = dgl;
|
adj_max_payload = max_payload - hdr_type_len[ETH1394_HDR_LF_FF];
|
}
|
return((dg_size + (adj_max_payload - 1)) / adj_max_payload);
|
}
|
|
static inline unsigned int eth1394_encapsulate(struct rtskb *skb,
|
unsigned int max_payload,
|
union eth1394_hdr *hdr)
|
{
|
union eth1394_hdr *bufhdr;
|
int ftype = hdr->common.lf;
|
int hdrsz = hdr_type_len[ftype];
|
unsigned int adj_max_payload = max_payload - hdrsz;
|
|
switch(ftype) {
|
case ETH1394_HDR_LF_UF:
|
bufhdr = (union eth1394_hdr *)rtskb_push(skb, hdrsz);
|
bufhdr->words.word1 = htons(hdr->words.word1);
|
bufhdr->words.word2 = hdr->words.word2;
|
break;
|
|
case ETH1394_HDR_LF_FF:
|
bufhdr = (union eth1394_hdr *)rtskb_push(skb, hdrsz);
|
bufhdr->words.word1 = htons(hdr->words.word1);
|
bufhdr->words.word2 = hdr->words.word2;
|
bufhdr->words.word3 = htons(hdr->words.word3);
|
bufhdr->words.word4 = 0;
|
|
/* Set frag type here for future interior fragments */
|
hdr->common.lf = ETH1394_HDR_LF_IF;
|
hdr->sf.fg_off = 0;
|
break;
|
|
default:
|
hdr->sf.fg_off += adj_max_payload;
|
bufhdr = (union eth1394_hdr *)rtskb_pull(skb, adj_max_payload);
|
if (max_payload >= skb->len)
|
hdr->common.lf = ETH1394_HDR_LF_LF;
|
bufhdr->words.word1 = htons(hdr->words.word1);
|
bufhdr->words.word2 = htons(hdr->words.word2);
|
bufhdr->words.word3 = htons(hdr->words.word3);
|
bufhdr->words.word4 = 0;
|
}
|
|
return min(max_payload, skb->len);
|
}
|
|
//just allocate a hpsb_packet header, without payload.
|
static inline struct hpsb_packet *eth1394_alloc_common_packet(struct hpsb_host *host, unsigned int priority)
|
{
|
struct hpsb_packet *p;
|
|
p = hpsb_alloc_packet(0,&host->pool, priority);
|
if (p) {
|
p->host = host;
|
p->data = NULL;
|
p->generation = get_hpsb_generation(host);
|
p->type = hpsb_async;
|
}
|
return p;
|
}
|
|
//prepare an asynchronous write packet
|
static inline int eth1394_prep_write_packet(struct hpsb_packet *p,
|
struct hpsb_host *host,
|
nodeid_t node, u64 addr,
|
void * data, int tx_len)
|
{
|
p->node_id = node;
|
|
p->tcode = TCODE_WRITEB;
|
|
p->header[1] = (host->node_id << 16) | (addr >> 32);
|
p->header[2] = addr & 0xffffffff;
|
|
p->header_size = 16;
|
p->expect_response = 1;
|
|
if (hpsb_get_tlabel(p)) {
|
ETH1394_PRINT_G(KERN_ERR, "No more tlabels left while sending "
|
"to node " NODE_BUS_FMT "\n", NODE_BUS_ARGS(host, node));
|
return -1;
|
}
|
p->header[0] = (p->node_id << 16) | (p->tlabel << 10)
|
| (1 << 8) | (TCODE_WRITEB << 4);
|
|
p->header[3] = tx_len << 16;
|
p->data_size = tx_len + (tx_len % 4 ? 4 - (tx_len % 4) : 0);
|
p->data = (quadlet_t*)data;
|
|
return 0;
|
}
|
|
//prepare gasp packet from skb.
|
static inline void eth1394_prep_gasp_packet(struct hpsb_packet *p,
|
struct eth1394_priv *priv,
|
struct rtskb *skb, int length)
|
{
|
p->header_size = 4;
|
p->tcode = TCODE_STREAM_DATA;
|
|
p->header[0] = (length << 16) | (3 << 14)
|
| ((priv->broadcast_channel) << 8)
|
| (TCODE_STREAM_DATA << 4);
|
p->data_size = length;
|
p->data = ((quadlet_t*)skb->data) - 2; //we need 64bits for extra spec_id and gasp version.
|
p->data[0] = cpu_to_be32((priv->host->node_id << 16) |
|
ETHER1394_GASP_SPECIFIER_ID_HI);
|
p->data[1] = cpu_to_be32((ETHER1394_GASP_SPECIFIER_ID_LO << 24) |
|
ETHER1394_GASP_VERSION);
|
|
/* Setting the node id to ALL_NODES (not LOCAL_BUS | ALL_NODES)
|
* prevents hpsb_send_packet() from setting the speed to an arbitrary
|
* value based on packet->node_id if packet->node_id is not set. */
|
p->node_id = ALL_NODES;
|
p->speed_code = priv->sspd[ALL_NODES];
|
}
|
|
|
static inline void eth1394_free_packet(struct hpsb_packet *packet)
|
{
|
if (packet->tcode != TCODE_STREAM_DATA)
|
hpsb_free_tlabel(packet);
|
hpsb_free_packet(packet);
|
}
|
|
static void eth1394_complete_cb(struct hpsb_packet *packet, void *__ptask);
|
|
|
/**
|
* this function does the real calling of hpsb_send_packet
|
*But before that, it also constructs the FireWire packet according to
|
* ptask
|
*/
|
static int eth1394_send_packet(struct packet_task *ptask, unsigned int tx_len, nanosecs_abs_t *xmit_stamp)
|
{
|
struct eth1394_priv *priv = ptask->priv;
|
struct hpsb_packet *packet = NULL;
|
int ret;
|
|
packet = eth1394_alloc_common_packet(priv->host, ptask->priority);
|
if (!packet) {
|
ret = -ENOMEM;
|
return ret;
|
}
|
if(xmit_stamp)
|
packet->xmit_stamp = xmit_stamp;
|
|
if (ptask->tx_type == ETH1394_GASP) {
|
int length = tx_len + (2 * sizeof(quadlet_t)); //for the extra gasp overhead
|
|
eth1394_prep_gasp_packet(packet, priv, ptask->skb, length);
|
} else if (eth1394_prep_write_packet(packet, priv->host,
|
ptask->dest_node,
|
ptask->addr, ptask->skb->data,
|
tx_len)) {
|
hpsb_free_packet(packet);
|
return -1;
|
}
|
|
ptask->packet = packet;
|
hpsb_set_packet_complete_task(ptask->packet, eth1394_complete_cb,
|
ptask);
|
|
ret = hpsb_send_packet(packet);
|
if (ret != 0) {
|
eth1394_free_packet(packet);
|
}
|
|
return ret;
|
}
|
|
|
/* Task function to be run when a datagram transmission is completed */
|
static inline void eth1394_dg_complete(struct packet_task *ptask, int fail)
|
{
|
struct rtskb *skb = ptask->skb;
|
struct rtnet_device *dev = skb->rtdev;
|
struct eth1394_priv *priv = (struct eth1394_priv *)dev->priv;
|
rtdm_lockctx_t context;
|
|
/* Statistics */
|
rtdm_lock_get_irqsave(&priv->lock, context);
|
if (fail) {
|
priv->stats.tx_dropped++;
|
priv->stats.tx_errors++;
|
} else {
|
priv->stats.tx_bytes += skb->len;
|
priv->stats.tx_packets++;
|
}
|
rtdm_lock_put_irqrestore(&priv->lock, context);
|
|
//dev_kfree_skb_any(skb);
|
kfree_rtskb(skb);
|
//~ kmem_cache_free(packet_task_cache, ptask);
|
//this means this ptask structure has been freed
|
ptask->packet=NULL;
|
}
|
|
|
/* Callback for when a packet has been sent and the status of that packet is
|
* known */
|
static void eth1394_complete_cb(struct hpsb_packet *packet, void *__ptask)
|
{
|
struct packet_task *ptask = (struct packet_task *)__ptask;
|
int fail = 0;
|
|
if (packet->tcode != TCODE_STREAM_DATA)
|
fail = hpsb_packet_success(packet);
|
|
//we have no rights to free packet, since it belongs to RT-FireWire kernel.
|
//~ eth1394_free_packet(packet);
|
|
ptask->outstanding_pkts--;
|
if (ptask->outstanding_pkts > 0 && !fail)
|
{
|
int tx_len;
|
|
/* Add the encapsulation header to the fragment */
|
tx_len = eth1394_encapsulate(ptask->skb, ptask->max_payload,
|
&ptask->hdr);
|
if (eth1394_send_packet(ptask, tx_len, NULL))
|
eth1394_dg_complete(ptask, 1);
|
} else {
|
eth1394_dg_complete(ptask, fail);
|
}
|
}
|
|
|
|
/**
|
*Transmit a packet (called by kernel)
|
* this is the dev->hard_start_transmit
|
*/
|
static int eth1394_tx (struct rtskb *skb, struct rtnet_device *dev)
|
{
|
|
struct ethhdr *eth;
|
struct eth1394_priv *priv = (struct eth1394_priv *)dev->priv;
|
int proto;
|
rtdm_lockctx_t context;
|
nodeid_t dest_node;
|
eth1394_tx_type tx_type;
|
int ret = 0;
|
unsigned int tx_len;
|
unsigned int max_payload;
|
u16 dg_size;
|
u16 dgl;
|
|
//we try to find the available ptask struct, if failed, we can not send packet
|
struct packet_task *ptask = NULL;
|
int i;
|
for(i=0;i<20;i++){
|
if(priv->ptask_list[i].packet == NULL){
|
ptask = &priv->ptask_list[i];
|
break;
|
}
|
}
|
if(ptask == NULL)
|
return -EBUSY;
|
|
rtdm_lock_get_irqsave(&priv->lock, context);
|
if (priv->bc_state == ETHER1394_BC_CLOSED) {
|
ETH1394_PRINT(KERN_ERR, dev->name,
|
"Cannot send packet, no broadcast channel available.\n");
|
ret = -EAGAIN;
|
rtdm_lock_put_irqrestore(&priv->lock, context);
|
goto fail;
|
}
|
if ((ret = eth1394_init_bc(dev))) {
|
rtdm_lock_put_irqrestore(&priv->lock, context);
|
goto fail;
|
}
|
rtdm_lock_put_irqrestore(&priv->lock, context);
|
//if ((skb = skb_share_check (skb, kmflags)) == NULL) {
|
// ret = -ENOMEM;
|
// goto fail;
|
//}
|
|
/* Get rid of the fake eth1394 header, but save a pointer */
|
eth = (struct ethhdr*)skb->data;
|
rtskb_pull(skb, ETH_HLEN);
|
//dont get rid of the fake eth1394 header, since we need it on the receiving side
|
//eth = (struct ethhdr*)skb->data;
|
|
//~ //find the node id via our fake MAC address
|
//~ ne = hpsb_guid_get_entry(be64_to_cpu(*(u64*)eth->h_dest));
|
//~ if (!ne)
|
//~ dest_node = LOCAL_BUS | ALL_NODES;
|
//~ else
|
//~ dest_node = ne->nodeid;
|
//now it is much easier
|
dest_node = *(u16*)eth->h_dest;
|
if(dest_node != 0xffff)
|
DEBUGP("%s: dest_node is %x\n", __FUNCTION__, dest_node);
|
|
proto = eth->h_proto;
|
|
/* If this is an ARP packet, convert it */
|
if (proto == __constant_htons (ETH_P_ARP))
|
eth1394_arp_to_1394arp (skb, dev);
|
|
max_payload = priv->maxpayload[NODEID_TO_NODE(dest_node)];
|
DEBUGP("%s: max_payload is %d\n", __FUNCTION__, max_payload);
|
|
/* This check should be unnecessary, but we'll keep it for safety for
|
* a while longer. */
|
if (max_payload < 512) {
|
DEBUGP("max_payload too small: %d (setting to 512)\n",
|
max_payload);
|
max_payload = 512;
|
}
|
|
/* Set the transmission type for the packet. ARP packets and IP
|
* broadcast packets are sent via GASP. */
|
if (memcmp(eth->h_dest, dev->broadcast, sizeof(nodeid_t)) == 0 ||
|
proto == __constant_htons(ETH_P_ARP) ||
|
(proto == __constant_htons(ETH_P_IP) &&
|
IN_MULTICAST(__constant_ntohl(skb->nh.iph->daddr)))) {
|
tx_type = ETH1394_GASP;
|
max_payload -= ETHER1394_GASP_OVERHEAD; //we have extra overhead for gasp packet
|
} else {
|
tx_type = ETH1394_WRREQ;
|
}
|
|
dg_size = skb->len;
|
|
rtdm_lock_get_irqsave(&priv->lock, context);
|
dgl = priv->dgl[NODEID_TO_NODE(dest_node)];
|
if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
|
priv->dgl[NODEID_TO_NODE(dest_node)]++;
|
rtdm_lock_put_irqrestore(&priv->lock, context);
|
|
ptask->hdr.words.word1 = 0;
|
ptask->hdr.words.word2 = 0;
|
ptask->hdr.words.word3 = 0;
|
ptask->hdr.words.word4 = 0;
|
ptask->skb = skb;
|
ptask->priv = priv;
|
ptask->tx_type = tx_type;
|
|
if (tx_type != ETH1394_GASP) {
|
u64 addr;
|
|
/* This test is just temporary until ConfigROM support has
|
* been added to eth1394. Until then, we need an ARP packet
|
* after a bus reset from the current destination node so that
|
* we can get FIFO information. */
|
//~ if (priv->fifo[NODEID_TO_NODE(dest_node)] == 0ULL) {
|
//~ ret = -EAGAIN;
|
//~ goto fail;
|
//~ }
|
|
//~ rtos_spin_lock_irqsave(&priv->lock, flags);
|
//~ addr = priv->fifo[NODEID_TO_NODE(dest_node)];
|
addr = ETHER1394_REGION_ADDR;
|
//~ rtos_spin_unlock_irqrestore(&priv->lock, flags);
|
|
ptask->addr = addr;
|
ptask->dest_node = dest_node;
|
}
|
|
ptask->tx_type = tx_type;
|
ptask->max_payload = max_payload;
|
ptask->outstanding_pkts = eth1394_encapsulate_prep(max_payload, proto,
|
&ptask->hdr, dg_size,
|
dgl);
|
|
/* Add the encapsulation header to the fragment */
|
tx_len = eth1394_encapsulate(skb, max_payload, &ptask->hdr);
|
//dev->trans_start = jiffies;
|
//~ if(skb->xmit_stamp)
|
//~ *skb->xmit_stamp = cpu_to_be64(rtos_get_time() + *skb->xmit_stamp);
|
|
|
if (eth1394_send_packet(ptask, tx_len, skb->xmit_stamp))
|
goto fail;
|
|
rtnetif_wake_queue(dev);
|
return 0;
|
fail:
|
if (ptask!=NULL){
|
//~ kmem_cache_free(packet_task_cache, ptask);
|
ptask->packet=NULL;
|
ptask=NULL;
|
}
|
|
if (skb != NULL)
|
dev_kfree_rtskb(skb);
|
|
rtdm_lock_get_irqsave(&priv->lock, context);
|
priv->stats.tx_dropped++;
|
priv->stats.tx_errors++;
|
rtdm_lock_put_irqrestore(&priv->lock, context);
|
|
if (rtnetif_queue_stopped(dev))
|
rtnetif_wake_queue(dev);
|
|
return 0; /* returning non-zero causes serious problems */
|
}
|
|
static int eth1394_init(void)
|
{
|
hpsb_register_highlevel(ð1394_highlevel);
|
|
return 0;
|
}
|
|
static void eth1394_exit(void)
|
{
|
hpsb_unregister_highlevel(ð1394_highlevel);
|
}
|
|
module_init(eth1394_init);
|
module_exit(eth1394_exit);
|
|
MODULE_LICENSE("GPL");
|
