+++ /dev/null
-/*********************************************************************
- *
- * 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 <linux/sched.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 netdev_tx_t irlan_eth_xmit(struct sk_buff *skb,
- struct net_device *dev);
-static void irlan_eth_set_multicast_list(struct net_device *dev);
-
-static const struct net_device_ops irlan_eth_netdev_ops = {
- .ndo_open = irlan_eth_open,
- .ndo_stop = irlan_eth_close,
- .ndo_start_xmit = irlan_eth_xmit,
- .ndo_set_rx_mode = irlan_eth_set_multicast_list,
- .ndo_validate_addr = eth_validate_addr,
-};
-
-/*
- * Function irlan_eth_setup (dev)
- *
- * The network device initialization function.
- *
- */
-static void irlan_eth_setup(struct net_device *dev)
-{
- ether_setup(dev);
-
- dev->netdev_ops = &irlan_eth_netdev_ops;
- dev->needs_free_netdev = true;
- dev->min_mtu = 0;
- dev->max_mtu = ETH_MAX_MTU;
-
- /*
- * 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, NET_NAME_UNKNOWN,
- 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);
-
- /* 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);
-
- /* 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 netdev_tx_t irlan_eth_xmit(struct sk_buff *skb,
- struct net_device *dev)
-{
- struct irlan_cb *self = netdev_priv(dev);
- int ret;
- unsigned int len;
-
- /* 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 NETDEV_TX_OK;
-
- /* Use the new skb instead */
- skb = new_skb;
- }
-
- netif_trans_update(dev);
-
- len = skb->len;
- /* 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 */
- dev->stats.tx_dropped++;
- } else {
- dev->stats.tx_packets++;
- dev->stats.tx_bytes += len;
- }
-
- return NETDEV_TX_OK;
-}
-
-/*
- * 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;
- struct net_device *dev = self->dev;
-
- if (skb == NULL) {
- dev->stats.rx_dropped++;
- return 0;
- }
- if (skb->len < ETH_HLEN) {
- pr_debug("%s() : IrLAN frame too short (%d)\n",
- __func__, skb->len);
- dev->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, dev); /* Remove eth header */
-
- dev->stats.rx_packets++;
- dev->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 = instance;
-
- IRDA_ASSERT(self != NULL, return;);
- IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
-
- dev = self->dev;
-
- IRDA_ASSERT(dev != NULL, return;);
-
- pr_debug("%s() : flow %s ; running %d\n", __func__,
- 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 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);
-
- /* Check if data channel has been connected yet */
- if (self->client.state != IRLAN_DATA) {
- pr_debug("%s(), delaying!\n", __func__);
- return;
- }
-
- if (dev->flags & IFF_PROMISC) {
- /* Enable promiscuous mode */
- net_warn_ratelimited("Promiscuous mode not implemented by IrLAN!\n");
- } else if ((dev->flags & IFF_ALLMULTI) ||
- netdev_mc_count(dev) > HW_MAX_ADDRS) {
- /* Disable promiscuous mode, use normal mode. */
- pr_debug("%s(), Setting multicast filter\n", __func__);
- /* hardware_set_filter(NULL); */
-
- irlan_set_multicast_filter(self, TRUE);
- } else if (!netdev_mc_empty(dev)) {
- pr_debug("%s(), Setting multicast filter\n", __func__);
- /* Walk the address list, and load the filter */
- /* hardware_set_filter(dev->mc_list); */
-
- irlan_set_multicast_filter(self, TRUE);
- } else {
- pr_debug("%s(), Clearing multicast filter\n", __func__);
- irlan_set_multicast_filter(self, FALSE);
- }
-
- if (dev->flags & IFF_BROADCAST)
- irlan_set_broadcast_filter(self, TRUE);
- else
- irlan_set_broadcast_filter(self, FALSE);
-}
projects / linux-2.6-block.git / blobdiff