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