Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 348 insertions, 0 deletions

diff --git a/drivers/isdn/hysdn/hysdn_net.c b/drivers/isdn/hysdn/hysdn_net.c
new file mode 100644
index 000000000000..babec8157ae6
--- /dev/null
+++ b/drivers/isdn/hysdn/hysdn_net.c
@@ -0,0 +1,348 @@
+/* $Id: hysdn_net.c,v 1.8.6.4 2001/09/23 22:24:54 kai Exp $
+ *
+ * Linux driver for HYSDN cards, net (ethernet type) handling routines.
+ *
+ * Author    Werner Cornelius (werner@titro.de) for Hypercope GmbH
+ * Copyright 1999 by Werner Cornelius (werner@titro.de)
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ * This net module has been inspired by the skeleton driver from
+ * Donald Becker (becker@CESDIS.gsfc.nasa.gov)
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/signal.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/inetdevice.h>
+
+#include "hysdn_defs.h"
+
+unsigned int hynet_enable = 0xffffffff; 
+MODULE_PARM(hynet_enable, "i");
+
+/* store the actual version for log reporting */
+char *hysdn_net_revision = "$Revision: 1.8.6.4 $";
+
+#define MAX_SKB_BUFFERS 20      /* number of buffers for keeping TX-data */
+
+/****************************************************************************/
+/* structure containing the complete network data. The structure is aligned */
+/* in a way that both, the device and statistics are kept inside it.        */
+/* for proper access, the device structure MUST be the first var/struct     */
+/* inside the definition.                                                   */
+/****************************************************************************/
+struct net_local {
+        struct net_device netdev;       /* the network device */
+        struct net_device_stats stats;
+        /* additional vars may be added here */
+        char dev_name[9];       /* our own device name */
+
+        /* Tx control lock.  This protects the transmit buffer ring
+         * state along with the "tx full" state of the driver.  This
+         * means all netif_queue flow control actions are protected
+         * by this lock as well.
+         */
+        spinlock_t lock;
+        struct sk_buff *skbs[MAX_SKB_BUFFERS];  /* pointers to tx-skbs */
+        int in_idx, out_idx;    /* indexes to buffer ring */
+        int sk_count;           /* number of buffers currently in ring */
+};                              /* net_local */
+
+
+/*****************************************************/
+/* Get the current statistics for this card.         */
+/* This may be called with the card open or closed ! */
+/*****************************************************/
+static struct net_device_stats *
+net_get_stats(struct net_device *dev)
+{
+        return (&((struct net_local *) dev)->stats);
+}                               /* net_device_stats */
+
+/*********************************************************************/
+/* Open/initialize the board. This is called (in the current kernel) */
+/* sometime after booting when the 'ifconfig' program is run.        */
+/* This routine should set everything up anew at each open, even     */
+/* registers that "should" only need to be set once at boot, so that */
+/* there is non-reboot way to recover if something goes wrong.       */
+/*********************************************************************/
+static int
+net_open(struct net_device *dev)
+{
+        struct in_device *in_dev;
+        hysdn_card *card = dev->priv;
+        int i;
+
+        netif_start_queue(dev); /* start tx-queueing */
+
+        /* Fill in the MAC-level header (if not already set) */
+        if (!card->mac_addr[0]) {
+                for (i = 0; i < ETH_ALEN - sizeof(ulong); i++)
+                        dev->dev_addr[i] = 0xfc;
+                if ((in_dev = dev->ip_ptr) != NULL) {
+                        struct in_ifaddr *ifa = in_dev->ifa_list;
+                        if (ifa != NULL)
+                                memcpy(dev->dev_addr + (ETH_ALEN - sizeof(ulong)), &ifa->ifa_local, sizeof(ulong));
+                }
+        } else
+                memcpy(dev->dev_addr, card->mac_addr, ETH_ALEN);
+
+        return (0);
+}                               /* net_open */
+
+/*******************************************/
+/* flush the currently occupied tx-buffers */
+/* must only be called when device closed  */
+/*******************************************/
+static void
+flush_tx_buffers(struct net_local *nl)
+{
+
+        while (nl->sk_count) {
+                dev_kfree_skb(nl->skbs[nl->out_idx++]);         /* free skb */
+                if (nl->out_idx >= MAX_SKB_BUFFERS)
+                        nl->out_idx = 0;        /* wrap around */
+                nl->sk_count--;
+        }
+}                               /* flush_tx_buffers */
+
+
+/*********************************************************************/
+/* close/decativate the device. The device is not removed, but only  */
+/* deactivated.                                                      */
+/*********************************************************************/
+static int
+net_close(struct net_device *dev)
+{
+
+        netif_stop_queue(dev);  /* disable queueing */
+
+        flush_tx_buffers((struct net_local *) dev);
+
+        return (0);             /* success */
+}                               /* net_close */
+
+/************************************/
+/* send a packet on this interface. */
+/* new style for kernel >= 2.3.33   */
+/************************************/
+static int
+net_send_packet(struct sk_buff *skb, struct net_device *dev)
+{
+        struct net_local *lp = (struct net_local *) dev;
+
+        spin_lock_irq(&lp->lock);
+
+        lp->skbs[lp->in_idx++] = skb;   /* add to buffer list */
+        if (lp->in_idx >= MAX_SKB_BUFFERS)
+                lp->in_idx = 0; /* wrap around */
+        lp->sk_count++;         /* adjust counter */
+        dev->trans_start = jiffies;
+
+        /* If we just used up the very last entry in the
+         * TX ring on this device, tell the queueing
+         * layer to send no more.
+         */
+        if (lp->sk_count >= MAX_SKB_BUFFERS)
+                netif_stop_queue(dev);
+
+        /* When the TX completion hw interrupt arrives, this
+         * is when the transmit statistics are updated.
+         */
+
+        spin_unlock_irq(&lp->lock);
+
+        if (lp->sk_count <= 3) {
+                schedule_work(&((hysdn_card *) dev->priv)->irq_queue);
+        }
+        return (0);             /* success */
+}                               /* net_send_packet */
+
+
+
+/***********************************************************************/
+/* acknowlegde a packet send. The network layer will be informed about */
+/* completion                                                          */
+/***********************************************************************/
+void
+hysdn_tx_netack(hysdn_card * card)
+{
+        struct net_local *lp = card->netif;
+
+        if (!lp)
+                return;         /* non existing device */
+
+
+        if (!lp->sk_count)
+                return;         /* error condition */
+
+        lp->stats.tx_packets++;
+        lp->stats.tx_bytes += lp->skbs[lp->out_idx]->len;
+
+        dev_kfree_skb(lp->skbs[lp->out_idx++]);         /* free skb */
+        if (lp->out_idx >= MAX_SKB_BUFFERS)
+                lp->out_idx = 0;        /* wrap around */
+
+        if (lp->sk_count-- == MAX_SKB_BUFFERS)  /* dec usage count */
+                netif_start_queue((struct net_device *) lp);
+}                               /* hysdn_tx_netack */
+
+/*****************************************************/
+/* we got a packet from the network, go and queue it */
+/*****************************************************/
+void
+hysdn_rx_netpkt(hysdn_card * card, uchar * buf, word len)
+{
+        struct net_local *lp = card->netif;
+        struct sk_buff *skb;
+
+        if (!lp)
+                return;         /* non existing device */
+
+        lp->stats.rx_bytes += len;
+
+        skb = dev_alloc_skb(len);
+        if (skb == NULL) {
+                printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n",
+                       lp->netdev.name);
+                lp->stats.rx_dropped++;
+                return;
+        }
+        skb->dev = &lp->netdev;
+
+        /* copy the data */
+        memcpy(skb_put(skb, len), buf, len);
+
+        /* determine the used protocol */
+        skb->protocol = eth_type_trans(skb, &lp->netdev);
+
+        netif_rx(skb);
+        lp->stats.rx_packets++; /* adjust packet count */
+
+}                               /* hysdn_rx_netpkt */
+
+/*****************************************************/
+/* return the pointer to a network packet to be send */
+/*****************************************************/
+struct sk_buff *
+hysdn_tx_netget(hysdn_card * card)
+{
+        struct net_local *lp = card->netif;
+
+        if (!lp)
+                return (NULL);  /* non existing device */
+
+        if (!lp->sk_count)
+                return (NULL);  /* nothing available */
+
+        return (lp->skbs[lp->out_idx]);         /* next packet to send */
+}                               /* hysdn_tx_netget */
+
+
+/*******************************************/
+/* init function called by register device */
+/*******************************************/
+static int
+net_init(struct net_device *dev)
+{
+        /* setup the function table */
+        dev->open = net_open;
+        dev->stop = net_close;
+        dev->hard_start_xmit = net_send_packet;
+        dev->get_stats = net_get_stats;
+
+        /* Fill in the fields of the device structure with ethernet values. */
+        ether_setup(dev);
+
+        return (0);             /* success */
+}                               /* net_init */
+
+/*****************************************************************************/
+/* hysdn_net_create creates a new net device for the given card. If a device */
+/* already exists, it will be deleted and created a new one. The return value */
+/* 0 announces success, else a negative error code will be returned.         */
+/*****************************************************************************/
+int
+hysdn_net_create(hysdn_card * card)
+{
+        struct net_device *dev;
+        int i;
+        if(!card) {
+                printk(KERN_WARNING "No card-pt in hysdn_net_create!\n");
+                return (-ENOMEM);
+        }
+        hysdn_net_release(card);        /* release an existing net device */
+        if ((dev = kmalloc(sizeof(struct net_local), GFP_KERNEL)) == NULL) {
+                printk(KERN_WARNING "HYSDN: unable to allocate mem\n");
+                return (-ENOMEM);
+        }
+        memset(dev, 0, sizeof(struct net_local));       /* clean the structure */
+
+        spin_lock_init(&((struct net_local *) dev)->lock);
+
+        /* initialise necessary or informing fields */
+        dev->base_addr = card->iobase;  /* IO address */
+        dev->irq = card->irq;   /* irq */
+        dev->init = net_init;   /* the init function of the device */
+        if(dev->name) {
+                strcpy(dev->name, ((struct net_local *) dev)->dev_name);
+        } 
+        if ((i = register_netdev(dev))) {
+                printk(KERN_WARNING "HYSDN: unable to create network device\n");
+                kfree(dev);
+                return (i);
+        }
+        dev->priv = card;       /* remember pointer to own data structure */
+        card->netif = dev;      /* setup the local pointer */
+
+        if (card->debug_flags & LOG_NET_INIT)
+                hysdn_addlog(card, "network device created");
+        return (0);             /* and return success */
+}                               /* hysdn_net_create */
+
+/***************************************************************************/
+/* hysdn_net_release deletes the net device for the given card. The return */
+/* value 0 announces success, else a negative error code will be returned. */
+/***************************************************************************/
+int
+hysdn_net_release(hysdn_card * card)
+{
+        struct net_device *dev = card->netif;
+
+        if (!dev)
+                return (0);     /* non existing */
+
+        card->netif = NULL;     /* clear out pointer */
+        dev->stop(dev);         /* close the device */
+
+        flush_tx_buffers((struct net_local *) dev);     /* empty buffers */
+
+        unregister_netdev(dev); /* release the device */
+        free_netdev(dev);       /* release the memory allocated */
+        if (card->debug_flags & LOG_NET_INIT)
+                hysdn_addlog(card, "network device deleted");
+
+        return (0);             /* always successful */
+}                               /* hysdn_net_release */
+
+/*****************************************************************************/
+/* hysdn_net_getname returns a pointer to the name of the network interface. */
+/* if the interface is not existing, a "-" is returned.                      */
+/*****************************************************************************/
+char *
+hysdn_net_getname(hysdn_card * card)
+{
+        struct net_device *dev = card->netif;
+
+        if (!dev)
+                return ("-");   /* non existing */
+
+        return (dev->name);
+}                               /* hysdn_net_getname */