1 /*********************************************************************
3 * Filename: irlan_eth.c
6 * Status: Experimental.
7 * Author: Dag Brattli <dagb@cs.uit.no>
8 * Created at: Thu Oct 15 08:37:58 1998
9 * Modified at: Tue Mar 21 09:06:41 2000
10 * Modified by: Dag Brattli <dagb@cs.uit.no>
11 * Sources: skeleton.c by Donald Becker <becker@CESDIS.gsfc.nasa.gov>
12 * slip.c by Laurence Culhane, <loz@holmes.demon.co.uk>
13 * Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
15 * Copyright (c) 1998-2000 Dag Brattli, All Rights Reserved.
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License as
19 * published by the Free Software Foundation; either version 2 of
20 * the License, or (at your option) any later version.
22 * Neither Dag Brattli nor University of Tromsø admit liability nor
23 * provide warranty for any of this software. This material is
24 * provided "AS-IS" and at no charge.
26 ********************************************************************/
28 #include <linux/netdevice.h>
29 #include <linux/etherdevice.h>
30 #include <linux/inetdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/module.h>
35 #include <net/irda/irda.h>
36 #include <net/irda/irmod.h>
37 #include <net/irda/irlan_common.h>
38 #include <net/irda/irlan_client.h>
39 #include <net/irda/irlan_event.h>
40 #include <net/irda/irlan_eth.h>
42 static int irlan_eth_open(struct net_device
*dev
);
43 static int irlan_eth_close(struct net_device
*dev
);
44 static netdev_tx_t
irlan_eth_xmit(struct sk_buff
*skb
,
45 struct net_device
*dev
);
46 static void irlan_eth_set_multicast_list( struct net_device
*dev
);
47 static struct net_device_stats
*irlan_eth_get_stats(struct net_device
*dev
);
49 static const struct net_device_ops irlan_eth_netdev_ops
= {
50 .ndo_open
= irlan_eth_open
,
51 .ndo_stop
= irlan_eth_close
,
52 .ndo_start_xmit
= irlan_eth_xmit
,
53 .ndo_get_stats
= irlan_eth_get_stats
,
54 .ndo_set_multicast_list
= irlan_eth_set_multicast_list
,
55 .ndo_change_mtu
= eth_change_mtu
,
56 .ndo_validate_addr
= eth_validate_addr
,
60 * Function irlan_eth_setup (dev)
62 * The network device initialization function.
65 static void irlan_eth_setup(struct net_device
*dev
)
69 dev
->netdev_ops
= &irlan_eth_netdev_ops
;
70 dev
->destructor
= free_netdev
;
74 * Lets do all queueing in IrTTP instead of this device driver.
75 * Queueing here as well can introduce some strange latency
76 * problems, which we will avoid by setting the queue size to 0.
79 * The bugs in IrTTP and IrLAN that created this latency issue
80 * have now been fixed, and we can propagate flow control properly
81 * to the network layer. However, this requires a minimal queue of
82 * packets for the device.
83 * Without flow control, the Tx Queue is 14 (ttp) + 0 (dev) = 14
84 * With flow control, the Tx Queue is 7 (ttp) + 4 (dev) = 11
85 * See irlan_eth_flow_indication()...
86 * Note : this number was randomly selected and would need to
89 dev
->tx_queue_len
= 4;
93 * Function alloc_irlandev
95 * Allocate network device and control block
98 struct net_device
*alloc_irlandev(const char *name
)
100 return alloc_netdev(sizeof(struct irlan_cb
), name
,
105 * Function irlan_eth_open (dev)
107 * Network device has been opened by user
110 static int irlan_eth_open(struct net_device
*dev
)
112 struct irlan_cb
*self
= netdev_priv(dev
);
114 IRDA_DEBUG(2, "%s()\n", __func__
);
117 netif_stop_queue(dev
); /* Wait until data link is ready */
119 /* We are now open, so time to do some work */
120 self
->disconnect_reason
= 0;
121 irlan_client_wakeup(self
, self
->saddr
, self
->daddr
);
123 /* Make sure we have a hardware address before we return,
124 so DHCP clients gets happy */
125 return wait_event_interruptible(self
->open_wait
,
126 !self
->tsap_data
->connected
);
130 * Function irlan_eth_close (dev)
132 * Stop the ether network device, his function will usually be called by
133 * ifconfig down. We should now disconnect the link, We start the
134 * close timer, so that the instance will be removed if we are unable
135 * to discover the remote device after the disconnect.
137 static int irlan_eth_close(struct net_device
*dev
)
139 struct irlan_cb
*self
= netdev_priv(dev
);
141 IRDA_DEBUG(2, "%s()\n", __func__
);
144 netif_stop_queue(dev
);
146 irlan_close_data_channel(self
);
147 irlan_close_tsaps(self
);
149 irlan_do_client_event(self
, IRLAN_LMP_DISCONNECT
, NULL
);
150 irlan_do_provider_event(self
, IRLAN_LMP_DISCONNECT
, NULL
);
152 /* Remove frames queued on the control channel */
153 skb_queue_purge(&self
->client
.txq
);
155 self
->client
.tx_busy
= 0;
161 * Function irlan_eth_tx (skb)
163 * Transmits ethernet frames over IrDA link.
166 static netdev_tx_t
irlan_eth_xmit(struct sk_buff
*skb
,
167 struct net_device
*dev
)
169 struct irlan_cb
*self
= netdev_priv(dev
);
172 /* skb headroom large enough to contain all IrDA-headers? */
173 if ((skb_headroom(skb
) < self
->max_header_size
) || (skb_shared(skb
))) {
174 struct sk_buff
*new_skb
=
175 skb_realloc_headroom(skb
, self
->max_header_size
);
177 /* We have to free the original skb anyway */
180 /* Did the realloc succeed? */
184 /* Use the new skb instead */
188 dev
->trans_start
= jiffies
;
190 /* Now queue the packet in the transport layer */
192 ret
= irttp_udata_request(self
->tsap_data
, skb
);
194 ret
= irttp_data_request(self
->tsap_data
, skb
);
198 * IrTTPs tx queue is full, so we just have to
199 * drop the frame! You might think that we should
200 * just return -1 and don't deallocate the frame,
201 * but that is dangerous since it's possible that
202 * we have replaced the original skb with a new
203 * one with larger headroom, and that would really
204 * confuse do_dev_queue_xmit() in dev.c! I have
207 /* irttp_data_request already free the packet */
208 self
->stats
.tx_dropped
++;
210 self
->stats
.tx_packets
++;
211 self
->stats
.tx_bytes
+= skb
->len
;
218 * Function irlan_eth_receive (handle, skb)
220 * This function gets the data that is received on the data channel
223 int irlan_eth_receive(void *instance
, void *sap
, struct sk_buff
*skb
)
225 struct irlan_cb
*self
= instance
;
228 ++self
->stats
.rx_dropped
;
231 if (skb
->len
< ETH_HLEN
) {
232 IRDA_DEBUG(0, "%s() : IrLAN frame too short (%d)\n",
234 ++self
->stats
.rx_dropped
;
240 * Adopt this frame! Important to set all these fields since they
241 * might have been previously set by the low level IrDA network
244 skb
->protocol
= eth_type_trans(skb
, self
->dev
); /* Remove eth header */
246 self
->stats
.rx_packets
++;
247 self
->stats
.rx_bytes
+= skb
->len
;
249 netif_rx(skb
); /* Eat it! */
255 * Function irlan_eth_flow (status)
257 * Do flow control between IP/Ethernet and IrLAN/IrTTP. This is done by
258 * controlling the queue stop/start.
260 * The IrDA link layer has the advantage to have flow control, and
261 * IrTTP now properly handles that. Flow controlling the higher layers
262 * prevent us to drop Tx packets in here (up to 15% for a TCP socket,
263 * more for UDP socket).
264 * Also, this allow us to reduce the overall transmit queue, which means
265 * less latency in case of mixed traffic.
268 void irlan_eth_flow_indication(void *instance
, void *sap
, LOCAL_FLOW flow
)
270 struct irlan_cb
*self
;
271 struct net_device
*dev
;
273 self
= (struct irlan_cb
*) instance
;
275 IRDA_ASSERT(self
!= NULL
, return;);
276 IRDA_ASSERT(self
->magic
== IRLAN_MAGIC
, return;);
280 IRDA_ASSERT(dev
!= NULL
, return;);
282 IRDA_DEBUG(0, "%s() : flow %s ; running %d\n", __func__
,
283 flow
== FLOW_STOP
? "FLOW_STOP" : "FLOW_START",
288 /* IrTTP is full, stop higher layers */
289 netif_stop_queue(dev
);
293 /* Tell upper layers that its time to transmit frames again */
294 /* Schedule network layer */
295 netif_wake_queue(dev
);
301 * Function set_multicast_list (dev)
303 * Configure the filtering of the device
306 #define HW_MAX_ADDRS 4 /* Must query to get it! */
307 static void irlan_eth_set_multicast_list(struct net_device
*dev
)
309 struct irlan_cb
*self
= netdev_priv(dev
);
311 IRDA_DEBUG(2, "%s()\n", __func__
);
313 /* Check if data channel has been connected yet */
314 if (self
->client
.state
!= IRLAN_DATA
) {
315 IRDA_DEBUG(1, "%s(), delaying!\n", __func__
);
319 if (dev
->flags
& IFF_PROMISC
) {
320 /* Enable promiscuous mode */
321 IRDA_WARNING("Promiscuous mode not implemented by IrLAN!\n");
323 else if ((dev
->flags
& IFF_ALLMULTI
) || dev
->mc_count
> HW_MAX_ADDRS
) {
324 /* Disable promiscuous mode, use normal mode. */
325 IRDA_DEBUG(4, "%s(), Setting multicast filter\n", __func__
);
326 /* hardware_set_filter(NULL); */
328 irlan_set_multicast_filter(self
, TRUE
);
330 else if (dev
->mc_count
) {
331 IRDA_DEBUG(4, "%s(), Setting multicast filter\n", __func__
);
332 /* Walk the address list, and load the filter */
333 /* hardware_set_filter(dev->mc_list); */
335 irlan_set_multicast_filter(self
, TRUE
);
338 IRDA_DEBUG(4, "%s(), Clearing multicast filter\n", __func__
);
339 irlan_set_multicast_filter(self
, FALSE
);
342 if (dev
->flags
& IFF_BROADCAST
)
343 irlan_set_broadcast_filter(self
, TRUE
);
345 irlan_set_broadcast_filter(self
, FALSE
);
349 * Function irlan_get_stats (dev)
351 * Get the current statistics for this device
354 static struct net_device_stats
*irlan_eth_get_stats(struct net_device
*dev
)
356 struct irlan_cb
*self
= netdev_priv(dev
);