347 lines
11 KiB
C
347 lines
11 KiB
C
/* $Id: hysdn_net.c,v 1.8.6.4 2001/09/23 22:24:54 kai Exp $
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*
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* Linux driver for HYSDN cards, net (ethernet type) handling routines.
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*
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* Author Werner Cornelius (werner@titro.de) for Hypercope GmbH
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* Copyright 1999 by Werner Cornelius (werner@titro.de)
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*
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* This software may be used and distributed according to the terms
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* of the GNU General Public License, incorporated herein by reference.
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*
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* This net module has been inspired by the skeleton driver from
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* Donald Becker (becker@CESDIS.gsfc.nasa.gov)
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*
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*/
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#include <linux/module.h>
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#include <linux/signal.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/inetdevice.h>
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#include "hysdn_defs.h"
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unsigned int hynet_enable = 0xffffffff;
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module_param(hynet_enable, uint, 0);
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/* store the actual version for log reporting */
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char *hysdn_net_revision = "$Revision: 1.8.6.4 $";
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#define MAX_SKB_BUFFERS 20 /* number of buffers for keeping TX-data */
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/****************************************************************************/
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/* structure containing the complete network data. The structure is aligned */
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/* in a way that both, the device and statistics are kept inside it. */
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/* for proper access, the device structure MUST be the first var/struct */
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/* inside the definition. */
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/****************************************************************************/
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struct net_local {
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struct net_device netdev; /* the network device */
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struct net_device_stats stats;
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/* additional vars may be added here */
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char dev_name[9]; /* our own device name */
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/* Tx control lock. This protects the transmit buffer ring
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* state along with the "tx full" state of the driver. This
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* means all netif_queue flow control actions are protected
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* by this lock as well.
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*/
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spinlock_t lock;
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struct sk_buff *skbs[MAX_SKB_BUFFERS]; /* pointers to tx-skbs */
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int in_idx, out_idx; /* indexes to buffer ring */
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int sk_count; /* number of buffers currently in ring */
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}; /* net_local */
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/*****************************************************/
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/* Get the current statistics for this card. */
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/* This may be called with the card open or closed ! */
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/*****************************************************/
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static struct net_device_stats *
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net_get_stats(struct net_device *dev)
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{
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return (&((struct net_local *) dev)->stats);
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} /* net_device_stats */
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/*********************************************************************/
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/* Open/initialize the board. This is called (in the current kernel) */
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/* sometime after booting when the 'ifconfig' program is run. */
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/* This routine should set everything up anew at each open, even */
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/* registers that "should" only need to be set once at boot, so that */
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/* there is non-reboot way to recover if something goes wrong. */
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/*********************************************************************/
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static int
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net_open(struct net_device *dev)
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{
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struct in_device *in_dev;
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hysdn_card *card = dev->priv;
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int i;
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netif_start_queue(dev); /* start tx-queueing */
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/* Fill in the MAC-level header (if not already set) */
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if (!card->mac_addr[0]) {
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for (i = 0; i < ETH_ALEN - sizeof(unsigned long); i++)
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dev->dev_addr[i] = 0xfc;
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if ((in_dev = dev->ip_ptr) != NULL) {
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struct in_ifaddr *ifa = in_dev->ifa_list;
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if (ifa != NULL)
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memcpy(dev->dev_addr + (ETH_ALEN - sizeof(unsigned long)), &ifa->ifa_local, sizeof(unsigned long));
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}
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} else
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memcpy(dev->dev_addr, card->mac_addr, ETH_ALEN);
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return (0);
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} /* net_open */
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/*******************************************/
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/* flush the currently occupied tx-buffers */
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/* must only be called when device closed */
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/*******************************************/
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static void
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flush_tx_buffers(struct net_local *nl)
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{
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while (nl->sk_count) {
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dev_kfree_skb(nl->skbs[nl->out_idx++]); /* free skb */
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if (nl->out_idx >= MAX_SKB_BUFFERS)
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nl->out_idx = 0; /* wrap around */
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nl->sk_count--;
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}
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} /* flush_tx_buffers */
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/*********************************************************************/
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/* close/decativate the device. The device is not removed, but only */
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/* deactivated. */
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/*********************************************************************/
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static int
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net_close(struct net_device *dev)
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{
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netif_stop_queue(dev); /* disable queueing */
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flush_tx_buffers((struct net_local *) dev);
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return (0); /* success */
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} /* net_close */
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/************************************/
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/* send a packet on this interface. */
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/* new style for kernel >= 2.3.33 */
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/************************************/
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static int
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net_send_packet(struct sk_buff *skb, struct net_device *dev)
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{
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struct net_local *lp = (struct net_local *) dev;
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spin_lock_irq(&lp->lock);
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lp->skbs[lp->in_idx++] = skb; /* add to buffer list */
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if (lp->in_idx >= MAX_SKB_BUFFERS)
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lp->in_idx = 0; /* wrap around */
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lp->sk_count++; /* adjust counter */
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dev->trans_start = jiffies;
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/* If we just used up the very last entry in the
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* TX ring on this device, tell the queueing
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* layer to send no more.
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*/
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if (lp->sk_count >= MAX_SKB_BUFFERS)
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netif_stop_queue(dev);
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/* When the TX completion hw interrupt arrives, this
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* is when the transmit statistics are updated.
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*/
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spin_unlock_irq(&lp->lock);
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if (lp->sk_count <= 3) {
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schedule_work(&((hysdn_card *) dev->priv)->irq_queue);
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}
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return (0); /* success */
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} /* net_send_packet */
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/***********************************************************************/
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/* acknowlegde a packet send. The network layer will be informed about */
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/* completion */
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/***********************************************************************/
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void
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hysdn_tx_netack(hysdn_card * card)
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{
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struct net_local *lp = card->netif;
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if (!lp)
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return; /* non existing device */
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if (!lp->sk_count)
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return; /* error condition */
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lp->stats.tx_packets++;
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lp->stats.tx_bytes += lp->skbs[lp->out_idx]->len;
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dev_kfree_skb(lp->skbs[lp->out_idx++]); /* free skb */
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if (lp->out_idx >= MAX_SKB_BUFFERS)
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lp->out_idx = 0; /* wrap around */
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if (lp->sk_count-- == MAX_SKB_BUFFERS) /* dec usage count */
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netif_start_queue((struct net_device *) lp);
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} /* hysdn_tx_netack */
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/*****************************************************/
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/* we got a packet from the network, go and queue it */
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/*****************************************************/
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void
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hysdn_rx_netpkt(hysdn_card * card, unsigned char *buf, unsigned short len)
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{
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struct net_local *lp = card->netif;
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struct sk_buff *skb;
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if (!lp)
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return; /* non existing device */
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lp->stats.rx_bytes += len;
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skb = dev_alloc_skb(len);
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if (skb == NULL) {
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printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n",
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lp->netdev.name);
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lp->stats.rx_dropped++;
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return;
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}
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skb->dev = &lp->netdev;
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/* copy the data */
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memcpy(skb_put(skb, len), buf, len);
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/* determine the used protocol */
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skb->protocol = eth_type_trans(skb, &lp->netdev);
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netif_rx(skb);
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lp->stats.rx_packets++; /* adjust packet count */
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} /* hysdn_rx_netpkt */
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/*****************************************************/
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/* return the pointer to a network packet to be send */
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/*****************************************************/
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struct sk_buff *
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hysdn_tx_netget(hysdn_card * card)
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{
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struct net_local *lp = card->netif;
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if (!lp)
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return (NULL); /* non existing device */
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if (!lp->sk_count)
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return (NULL); /* nothing available */
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return (lp->skbs[lp->out_idx]); /* next packet to send */
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} /* hysdn_tx_netget */
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/*******************************************/
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/* init function called by register device */
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/*******************************************/
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static int
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net_init(struct net_device *dev)
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{
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/* setup the function table */
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dev->open = net_open;
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dev->stop = net_close;
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dev->hard_start_xmit = net_send_packet;
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dev->get_stats = net_get_stats;
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/* Fill in the fields of the device structure with ethernet values. */
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ether_setup(dev);
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return (0); /* success */
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} /* net_init */
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/*****************************************************************************/
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/* hysdn_net_create creates a new net device for the given card. If a device */
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/* already exists, it will be deleted and created a new one. The return value */
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/* 0 announces success, else a negative error code will be returned. */
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/*****************************************************************************/
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int
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hysdn_net_create(hysdn_card * card)
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{
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struct net_device *dev;
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int i;
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if(!card) {
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printk(KERN_WARNING "No card-pt in hysdn_net_create!\n");
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return (-ENOMEM);
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}
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hysdn_net_release(card); /* release an existing net device */
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if ((dev = kzalloc(sizeof(struct net_local), GFP_KERNEL)) == NULL) {
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printk(KERN_WARNING "HYSDN: unable to allocate mem\n");
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return (-ENOMEM);
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}
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spin_lock_init(&((struct net_local *) dev)->lock);
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/* initialise necessary or informing fields */
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dev->base_addr = card->iobase; /* IO address */
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dev->irq = card->irq; /* irq */
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dev->init = net_init; /* the init function of the device */
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if(dev->name) {
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strcpy(dev->name, ((struct net_local *) dev)->dev_name);
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}
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if ((i = register_netdev(dev))) {
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printk(KERN_WARNING "HYSDN: unable to create network device\n");
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kfree(dev);
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return (i);
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}
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dev->priv = card; /* remember pointer to own data structure */
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card->netif = dev; /* setup the local pointer */
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if (card->debug_flags & LOG_NET_INIT)
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hysdn_addlog(card, "network device created");
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return (0); /* and return success */
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} /* hysdn_net_create */
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/***************************************************************************/
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/* hysdn_net_release deletes the net device for the given card. The return */
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/* value 0 announces success, else a negative error code will be returned. */
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/***************************************************************************/
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int
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hysdn_net_release(hysdn_card * card)
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{
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struct net_device *dev = card->netif;
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if (!dev)
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return (0); /* non existing */
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card->netif = NULL; /* clear out pointer */
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dev->stop(dev); /* close the device */
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flush_tx_buffers((struct net_local *) dev); /* empty buffers */
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unregister_netdev(dev); /* release the device */
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free_netdev(dev); /* release the memory allocated */
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if (card->debug_flags & LOG_NET_INIT)
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hysdn_addlog(card, "network device deleted");
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return (0); /* always successful */
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} /* hysdn_net_release */
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/*****************************************************************************/
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/* hysdn_net_getname returns a pointer to the name of the network interface. */
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/* if the interface is not existing, a "-" is returned. */
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/*****************************************************************************/
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char *
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hysdn_net_getname(hysdn_card * card)
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{
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struct net_device *dev = card->netif;
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if (!dev)
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return ("-"); /* non existing */
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return (dev->name);
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} /* hysdn_net_getname */
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