386 строки
10 KiB
C
386 строки
10 KiB
C
/*********************************************************************
|
|
*
|
|
* Filename: irlan_eth.c
|
|
* Version:
|
|
* Description:
|
|
* Status: Experimental.
|
|
* Author: Dag Brattli <dagb@cs.uit.no>
|
|
* Created at: Thu Oct 15 08:37:58 1998
|
|
* Modified at: Tue Mar 21 09:06:41 2000
|
|
* Modified by: Dag Brattli <dagb@cs.uit.no>
|
|
* Sources: skeleton.c by Donald Becker <becker@CESDIS.gsfc.nasa.gov>
|
|
* slip.c by Laurence Culhane, <loz@holmes.demon.co.uk>
|
|
* Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
|
|
*
|
|
* Copyright (c) 1998-2000 Dag Brattli, All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of
|
|
* the License, or (at your option) any later version.
|
|
*
|
|
* Neither Dag Brattli nor University of Tromsø admit liability nor
|
|
* provide warranty for any of this software. This material is
|
|
* provided "AS-IS" and at no charge.
|
|
*
|
|
********************************************************************/
|
|
|
|
#include <linux/netdevice.h>
|
|
#include <linux/etherdevice.h>
|
|
#include <linux/inetdevice.h>
|
|
#include <linux/if_arp.h>
|
|
#include <linux/module.h>
|
|
#include <net/arp.h>
|
|
|
|
#include <net/irda/irda.h>
|
|
#include <net/irda/irmod.h>
|
|
#include <net/irda/irlan_common.h>
|
|
#include <net/irda/irlan_client.h>
|
|
#include <net/irda/irlan_event.h>
|
|
#include <net/irda/irlan_eth.h>
|
|
|
|
static int irlan_eth_open(struct net_device *dev);
|
|
static int irlan_eth_close(struct net_device *dev);
|
|
static int irlan_eth_xmit(struct sk_buff *skb, struct net_device *dev);
|
|
static void irlan_eth_set_multicast_list( struct net_device *dev);
|
|
static struct net_device_stats *irlan_eth_get_stats(struct net_device *dev);
|
|
|
|
/*
|
|
* Function irlan_eth_setup (dev)
|
|
*
|
|
* The network device initialization function.
|
|
*
|
|
*/
|
|
static void irlan_eth_setup(struct net_device *dev)
|
|
{
|
|
dev->open = irlan_eth_open;
|
|
dev->stop = irlan_eth_close;
|
|
dev->hard_start_xmit = irlan_eth_xmit;
|
|
dev->get_stats = irlan_eth_get_stats;
|
|
dev->set_multicast_list = irlan_eth_set_multicast_list;
|
|
dev->destructor = free_netdev;
|
|
|
|
SET_MODULE_OWNER(dev);
|
|
|
|
ether_setup(dev);
|
|
|
|
/*
|
|
* Lets do all queueing in IrTTP instead of this device driver.
|
|
* Queueing here as well can introduce some strange latency
|
|
* problems, which we will avoid by setting the queue size to 0.
|
|
*/
|
|
/*
|
|
* The bugs in IrTTP and IrLAN that created this latency issue
|
|
* have now been fixed, and we can propagate flow control properly
|
|
* to the network layer. However, this requires a minimal queue of
|
|
* packets for the device.
|
|
* Without flow control, the Tx Queue is 14 (ttp) + 0 (dev) = 14
|
|
* With flow control, the Tx Queue is 7 (ttp) + 4 (dev) = 11
|
|
* See irlan_eth_flow_indication()...
|
|
* Note : this number was randomly selected and would need to
|
|
* be adjusted.
|
|
* Jean II */
|
|
dev->tx_queue_len = 4;
|
|
}
|
|
|
|
/*
|
|
* Function alloc_irlandev
|
|
*
|
|
* Allocate network device and control block
|
|
*
|
|
*/
|
|
struct net_device *alloc_irlandev(const char *name)
|
|
{
|
|
return alloc_netdev(sizeof(struct irlan_cb), name,
|
|
irlan_eth_setup);
|
|
}
|
|
|
|
/*
|
|
* Function irlan_eth_open (dev)
|
|
*
|
|
* Network device has been opened by user
|
|
*
|
|
*/
|
|
static int irlan_eth_open(struct net_device *dev)
|
|
{
|
|
struct irlan_cb *self = netdev_priv(dev);
|
|
|
|
IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
|
|
|
|
/* Ready to play! */
|
|
netif_stop_queue(dev); /* Wait until data link is ready */
|
|
|
|
/* We are now open, so time to do some work */
|
|
self->disconnect_reason = 0;
|
|
irlan_client_wakeup(self, self->saddr, self->daddr);
|
|
|
|
/* Make sure we have a hardware address before we return,
|
|
so DHCP clients gets happy */
|
|
return wait_event_interruptible(self->open_wait,
|
|
!self->tsap_data->connected);
|
|
}
|
|
|
|
/*
|
|
* Function irlan_eth_close (dev)
|
|
*
|
|
* Stop the ether network device, his function will usually be called by
|
|
* ifconfig down. We should now disconnect the link, We start the
|
|
* close timer, so that the instance will be removed if we are unable
|
|
* to discover the remote device after the disconnect.
|
|
*/
|
|
static int irlan_eth_close(struct net_device *dev)
|
|
{
|
|
struct irlan_cb *self = netdev_priv(dev);
|
|
|
|
IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
|
|
|
|
/* Stop device */
|
|
netif_stop_queue(dev);
|
|
|
|
irlan_close_data_channel(self);
|
|
irlan_close_tsaps(self);
|
|
|
|
irlan_do_client_event(self, IRLAN_LMP_DISCONNECT, NULL);
|
|
irlan_do_provider_event(self, IRLAN_LMP_DISCONNECT, NULL);
|
|
|
|
/* Remove frames queued on the control channel */
|
|
skb_queue_purge(&self->client.txq);
|
|
|
|
self->client.tx_busy = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Function irlan_eth_tx (skb)
|
|
*
|
|
* Transmits ethernet frames over IrDA link.
|
|
*
|
|
*/
|
|
static int irlan_eth_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct irlan_cb *self = netdev_priv(dev);
|
|
int ret;
|
|
|
|
/* skb headroom large enough to contain all IrDA-headers? */
|
|
if ((skb_headroom(skb) < self->max_header_size) || (skb_shared(skb))) {
|
|
struct sk_buff *new_skb =
|
|
skb_realloc_headroom(skb, self->max_header_size);
|
|
|
|
/* We have to free the original skb anyway */
|
|
dev_kfree_skb(skb);
|
|
|
|
/* Did the realloc succeed? */
|
|
if (new_skb == NULL)
|
|
return 0;
|
|
|
|
/* Use the new skb instead */
|
|
skb = new_skb;
|
|
}
|
|
|
|
dev->trans_start = jiffies;
|
|
|
|
/* Now queue the packet in the transport layer */
|
|
if (self->use_udata)
|
|
ret = irttp_udata_request(self->tsap_data, skb);
|
|
else
|
|
ret = irttp_data_request(self->tsap_data, skb);
|
|
|
|
if (ret < 0) {
|
|
/*
|
|
* IrTTPs tx queue is full, so we just have to
|
|
* drop the frame! You might think that we should
|
|
* just return -1 and don't deallocate the frame,
|
|
* but that is dangerous since it's possible that
|
|
* we have replaced the original skb with a new
|
|
* one with larger headroom, and that would really
|
|
* confuse do_dev_queue_xmit() in dev.c! I have
|
|
* tried :-) DB
|
|
*/
|
|
/* irttp_data_request already free the packet */
|
|
self->stats.tx_dropped++;
|
|
} else {
|
|
self->stats.tx_packets++;
|
|
self->stats.tx_bytes += skb->len;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Function irlan_eth_receive (handle, skb)
|
|
*
|
|
* This function gets the data that is received on the data channel
|
|
*
|
|
*/
|
|
int irlan_eth_receive(void *instance, void *sap, struct sk_buff *skb)
|
|
{
|
|
struct irlan_cb *self = instance;
|
|
|
|
if (skb == NULL) {
|
|
++self->stats.rx_dropped;
|
|
return 0;
|
|
}
|
|
if (skb->len < ETH_HLEN) {
|
|
IRDA_DEBUG(0, "%s() : IrLAN frame too short (%d)\n",
|
|
__FUNCTION__, skb->len);
|
|
++self->stats.rx_dropped;
|
|
dev_kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Adopt this frame! Important to set all these fields since they
|
|
* might have been previously set by the low level IrDA network
|
|
* device driver
|
|
*/
|
|
skb->protocol = eth_type_trans(skb, self->dev); /* Remove eth header */
|
|
|
|
self->stats.rx_packets++;
|
|
self->stats.rx_bytes += skb->len;
|
|
|
|
netif_rx(skb); /* Eat it! */
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Function irlan_eth_flow (status)
|
|
*
|
|
* Do flow control between IP/Ethernet and IrLAN/IrTTP. This is done by
|
|
* controlling the queue stop/start.
|
|
*
|
|
* The IrDA link layer has the advantage to have flow control, and
|
|
* IrTTP now properly handles that. Flow controlling the higher layers
|
|
* prevent us to drop Tx packets in here (up to 15% for a TCP socket,
|
|
* more for UDP socket).
|
|
* Also, this allow us to reduce the overall transmit queue, which means
|
|
* less latency in case of mixed traffic.
|
|
* Jean II
|
|
*/
|
|
void irlan_eth_flow_indication(void *instance, void *sap, LOCAL_FLOW flow)
|
|
{
|
|
struct irlan_cb *self;
|
|
struct net_device *dev;
|
|
|
|
self = (struct irlan_cb *) instance;
|
|
|
|
IRDA_ASSERT(self != NULL, return;);
|
|
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
|
|
|
|
dev = self->dev;
|
|
|
|
IRDA_ASSERT(dev != NULL, return;);
|
|
|
|
IRDA_DEBUG(0, "%s() : flow %s ; running %d\n", __FUNCTION__,
|
|
flow == FLOW_STOP ? "FLOW_STOP" : "FLOW_START",
|
|
netif_running(dev));
|
|
|
|
switch (flow) {
|
|
case FLOW_STOP:
|
|
/* IrTTP is full, stop higher layers */
|
|
netif_stop_queue(dev);
|
|
break;
|
|
case FLOW_START:
|
|
default:
|
|
/* Tell upper layers that its time to transmit frames again */
|
|
/* Schedule network layer */
|
|
netif_wake_queue(dev);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Function irlan_etc_send_gratuitous_arp (dev)
|
|
*
|
|
* Send gratuitous ARP to announce that we have changed
|
|
* hardware address, so that all peers updates their ARP tables
|
|
*/
|
|
void irlan_eth_send_gratuitous_arp(struct net_device *dev)
|
|
{
|
|
struct in_device *in_dev;
|
|
|
|
/*
|
|
* When we get a new MAC address do a gratuitous ARP. This
|
|
* is useful if we have changed access points on the same
|
|
* subnet.
|
|
*/
|
|
#ifdef CONFIG_INET
|
|
IRDA_DEBUG(4, "IrLAN: Sending gratuitous ARP\n");
|
|
rcu_read_lock();
|
|
in_dev = __in_dev_get_rcu(dev);
|
|
if (in_dev == NULL)
|
|
goto out;
|
|
if (in_dev->ifa_list)
|
|
|
|
arp_send(ARPOP_REQUEST, ETH_P_ARP,
|
|
in_dev->ifa_list->ifa_address,
|
|
dev,
|
|
in_dev->ifa_list->ifa_address,
|
|
NULL, dev->dev_addr, NULL);
|
|
out:
|
|
rcu_read_unlock();
|
|
#endif /* CONFIG_INET */
|
|
}
|
|
|
|
/*
|
|
* Function set_multicast_list (dev)
|
|
*
|
|
* Configure the filtering of the device
|
|
*
|
|
*/
|
|
#define HW_MAX_ADDRS 4 /* Must query to get it! */
|
|
static void irlan_eth_set_multicast_list(struct net_device *dev)
|
|
{
|
|
struct irlan_cb *self = netdev_priv(dev);
|
|
|
|
IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
|
|
|
|
/* Check if data channel has been connected yet */
|
|
if (self->client.state != IRLAN_DATA) {
|
|
IRDA_DEBUG(1, "%s(), delaying!\n", __FUNCTION__ );
|
|
return;
|
|
}
|
|
|
|
if (dev->flags & IFF_PROMISC) {
|
|
/* Enable promiscuous mode */
|
|
IRDA_WARNING("Promiscous mode not implemented by IrLAN!\n");
|
|
}
|
|
else if ((dev->flags & IFF_ALLMULTI) || dev->mc_count > HW_MAX_ADDRS) {
|
|
/* Disable promiscuous mode, use normal mode. */
|
|
IRDA_DEBUG(4, "%s(), Setting multicast filter\n", __FUNCTION__ );
|
|
/* hardware_set_filter(NULL); */
|
|
|
|
irlan_set_multicast_filter(self, TRUE);
|
|
}
|
|
else if (dev->mc_count) {
|
|
IRDA_DEBUG(4, "%s(), Setting multicast filter\n", __FUNCTION__ );
|
|
/* Walk the address list, and load the filter */
|
|
/* hardware_set_filter(dev->mc_list); */
|
|
|
|
irlan_set_multicast_filter(self, TRUE);
|
|
}
|
|
else {
|
|
IRDA_DEBUG(4, "%s(), Clearing multicast filter\n", __FUNCTION__ );
|
|
irlan_set_multicast_filter(self, FALSE);
|
|
}
|
|
|
|
if (dev->flags & IFF_BROADCAST)
|
|
irlan_set_broadcast_filter(self, TRUE);
|
|
else
|
|
irlan_set_broadcast_filter(self, FALSE);
|
|
}
|
|
|
|
/*
|
|
* Function irlan_get_stats (dev)
|
|
*
|
|
* Get the current statistics for this device
|
|
*
|
|
*/
|
|
static struct net_device_stats *irlan_eth_get_stats(struct net_device *dev)
|
|
{
|
|
struct irlan_cb *self = netdev_priv(dev);
|
|
|
|
return &self->stats;
|
|
}
|