diff options
Diffstat (limited to 'net/irda/irlan/irlan_eth.c')
| -rw-r--r-- | net/irda/irlan/irlan_eth.c | 387 |
1 files changed, 387 insertions, 0 deletions
diff --git a/net/irda/irlan/irlan_eth.c b/net/irda/irlan/irlan_eth.c new file mode 100644 index 000000000000..071cd2cefd8a --- /dev/null +++ b/net/irda/irlan/irlan_eth.c @@ -0,0 +1,387 @@ +/********************************************************************* + * + * 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 Troms admit liability nor + * provide warranty for any of this software. This material is + * provided "AS-IS" and at no charge. + * + ********************************************************************/ + +#include <linux/config.h> +#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->dev = self->dev; + skb->protocol=eth_type_trans(skb, skb->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(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; +} |