Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* $Id: hysdn_net.c,v 1.8.6.4 2001/09/23 22:24:54 kai Exp $ |
| 2 | * |
| 3 | * Linux driver for HYSDN cards, net (ethernet type) handling routines. |
| 4 | * |
| 5 | * Author Werner Cornelius (werner@titro.de) for Hypercope GmbH |
| 6 | * Copyright 1999 by Werner Cornelius (werner@titro.de) |
| 7 | * |
| 8 | * This software may be used and distributed according to the terms |
| 9 | * of the GNU General Public License, incorporated herein by reference. |
| 10 | * |
| 11 | * This net module has been inspired by the skeleton driver from |
| 12 | * Donald Becker (becker@CESDIS.gsfc.nasa.gov) |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/signal.h> |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/netdevice.h> |
| 20 | #include <linux/etherdevice.h> |
| 21 | #include <linux/skbuff.h> |
| 22 | #include <linux/inetdevice.h> |
| 23 | |
| 24 | #include "hysdn_defs.h" |
| 25 | |
| 26 | unsigned int hynet_enable = 0xffffffff; |
Rusty Russell | 8d3b33f | 2006-03-25 03:07:05 -0800 | [diff] [blame] | 27 | module_param(hynet_enable, uint, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
| 29 | /* store the actual version for log reporting */ |
| 30 | char *hysdn_net_revision = "$Revision: 1.8.6.4 $"; |
| 31 | |
| 32 | #define MAX_SKB_BUFFERS 20 /* number of buffers for keeping TX-data */ |
| 33 | |
| 34 | /****************************************************************************/ |
| 35 | /* structure containing the complete network data. The structure is aligned */ |
| 36 | /* in a way that both, the device and statistics are kept inside it. */ |
| 37 | /* for proper access, the device structure MUST be the first var/struct */ |
| 38 | /* inside the definition. */ |
| 39 | /****************************************************************************/ |
| 40 | struct net_local { |
| 41 | struct net_device netdev; /* the network device */ |
| 42 | struct net_device_stats stats; |
| 43 | /* additional vars may be added here */ |
| 44 | char dev_name[9]; /* our own device name */ |
| 45 | |
| 46 | /* Tx control lock. This protects the transmit buffer ring |
| 47 | * state along with the "tx full" state of the driver. This |
| 48 | * means all netif_queue flow control actions are protected |
| 49 | * by this lock as well. |
| 50 | */ |
| 51 | spinlock_t lock; |
| 52 | struct sk_buff *skbs[MAX_SKB_BUFFERS]; /* pointers to tx-skbs */ |
| 53 | int in_idx, out_idx; /* indexes to buffer ring */ |
| 54 | int sk_count; /* number of buffers currently in ring */ |
| 55 | }; /* net_local */ |
| 56 | |
| 57 | |
| 58 | /*****************************************************/ |
| 59 | /* Get the current statistics for this card. */ |
| 60 | /* This may be called with the card open or closed ! */ |
| 61 | /*****************************************************/ |
| 62 | static struct net_device_stats * |
| 63 | net_get_stats(struct net_device *dev) |
| 64 | { |
| 65 | return (&((struct net_local *) dev)->stats); |
| 66 | } /* net_device_stats */ |
| 67 | |
| 68 | /*********************************************************************/ |
| 69 | /* Open/initialize the board. This is called (in the current kernel) */ |
| 70 | /* sometime after booting when the 'ifconfig' program is run. */ |
| 71 | /* This routine should set everything up anew at each open, even */ |
| 72 | /* registers that "should" only need to be set once at boot, so that */ |
| 73 | /* there is non-reboot way to recover if something goes wrong. */ |
| 74 | /*********************************************************************/ |
| 75 | static int |
| 76 | net_open(struct net_device *dev) |
| 77 | { |
| 78 | struct in_device *in_dev; |
| 79 | hysdn_card *card = dev->priv; |
| 80 | int i; |
| 81 | |
| 82 | netif_start_queue(dev); /* start tx-queueing */ |
| 83 | |
| 84 | /* Fill in the MAC-level header (if not already set) */ |
| 85 | if (!card->mac_addr[0]) { |
Andrew Morton | c721bcc | 2006-03-25 03:07:04 -0800 | [diff] [blame] | 86 | for (i = 0; i < ETH_ALEN - sizeof(unsigned long); i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | dev->dev_addr[i] = 0xfc; |
| 88 | if ((in_dev = dev->ip_ptr) != NULL) { |
| 89 | struct in_ifaddr *ifa = in_dev->ifa_list; |
| 90 | if (ifa != NULL) |
Andrew Morton | c721bcc | 2006-03-25 03:07:04 -0800 | [diff] [blame] | 91 | memcpy(dev->dev_addr + (ETH_ALEN - sizeof(unsigned long)), &ifa->ifa_local, sizeof(unsigned long)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | } |
| 93 | } else |
| 94 | memcpy(dev->dev_addr, card->mac_addr, ETH_ALEN); |
| 95 | |
| 96 | return (0); |
| 97 | } /* net_open */ |
| 98 | |
| 99 | /*******************************************/ |
| 100 | /* flush the currently occupied tx-buffers */ |
| 101 | /* must only be called when device closed */ |
| 102 | /*******************************************/ |
| 103 | static void |
| 104 | flush_tx_buffers(struct net_local *nl) |
| 105 | { |
| 106 | |
| 107 | while (nl->sk_count) { |
| 108 | dev_kfree_skb(nl->skbs[nl->out_idx++]); /* free skb */ |
| 109 | if (nl->out_idx >= MAX_SKB_BUFFERS) |
| 110 | nl->out_idx = 0; /* wrap around */ |
| 111 | nl->sk_count--; |
| 112 | } |
| 113 | } /* flush_tx_buffers */ |
| 114 | |
| 115 | |
| 116 | /*********************************************************************/ |
| 117 | /* close/decativate the device. The device is not removed, but only */ |
| 118 | /* deactivated. */ |
| 119 | /*********************************************************************/ |
| 120 | static int |
| 121 | net_close(struct net_device *dev) |
| 122 | { |
| 123 | |
| 124 | netif_stop_queue(dev); /* disable queueing */ |
| 125 | |
| 126 | flush_tx_buffers((struct net_local *) dev); |
| 127 | |
| 128 | return (0); /* success */ |
| 129 | } /* net_close */ |
| 130 | |
| 131 | /************************************/ |
| 132 | /* send a packet on this interface. */ |
| 133 | /* new style for kernel >= 2.3.33 */ |
| 134 | /************************************/ |
| 135 | static int |
| 136 | net_send_packet(struct sk_buff *skb, struct net_device *dev) |
| 137 | { |
| 138 | struct net_local *lp = (struct net_local *) dev; |
| 139 | |
| 140 | spin_lock_irq(&lp->lock); |
| 141 | |
| 142 | lp->skbs[lp->in_idx++] = skb; /* add to buffer list */ |
| 143 | if (lp->in_idx >= MAX_SKB_BUFFERS) |
| 144 | lp->in_idx = 0; /* wrap around */ |
| 145 | lp->sk_count++; /* adjust counter */ |
| 146 | dev->trans_start = jiffies; |
| 147 | |
| 148 | /* If we just used up the very last entry in the |
| 149 | * TX ring on this device, tell the queueing |
| 150 | * layer to send no more. |
| 151 | */ |
| 152 | if (lp->sk_count >= MAX_SKB_BUFFERS) |
| 153 | netif_stop_queue(dev); |
| 154 | |
| 155 | /* When the TX completion hw interrupt arrives, this |
| 156 | * is when the transmit statistics are updated. |
| 157 | */ |
| 158 | |
| 159 | spin_unlock_irq(&lp->lock); |
| 160 | |
| 161 | if (lp->sk_count <= 3) { |
| 162 | schedule_work(&((hysdn_card *) dev->priv)->irq_queue); |
| 163 | } |
| 164 | return (0); /* success */ |
| 165 | } /* net_send_packet */ |
| 166 | |
| 167 | |
| 168 | |
| 169 | /***********************************************************************/ |
| 170 | /* acknowlegde a packet send. The network layer will be informed about */ |
| 171 | /* completion */ |
| 172 | /***********************************************************************/ |
| 173 | void |
| 174 | hysdn_tx_netack(hysdn_card * card) |
| 175 | { |
| 176 | struct net_local *lp = card->netif; |
| 177 | |
| 178 | if (!lp) |
| 179 | return; /* non existing device */ |
| 180 | |
| 181 | |
| 182 | if (!lp->sk_count) |
| 183 | return; /* error condition */ |
| 184 | |
| 185 | lp->stats.tx_packets++; |
| 186 | lp->stats.tx_bytes += lp->skbs[lp->out_idx]->len; |
| 187 | |
| 188 | dev_kfree_skb(lp->skbs[lp->out_idx++]); /* free skb */ |
| 189 | if (lp->out_idx >= MAX_SKB_BUFFERS) |
| 190 | lp->out_idx = 0; /* wrap around */ |
| 191 | |
| 192 | if (lp->sk_count-- == MAX_SKB_BUFFERS) /* dec usage count */ |
| 193 | netif_start_queue((struct net_device *) lp); |
| 194 | } /* hysdn_tx_netack */ |
| 195 | |
| 196 | /*****************************************************/ |
| 197 | /* we got a packet from the network, go and queue it */ |
| 198 | /*****************************************************/ |
| 199 | void |
Andrew Morton | c721bcc | 2006-03-25 03:07:04 -0800 | [diff] [blame] | 200 | hysdn_rx_netpkt(hysdn_card * card, unsigned char *buf, unsigned short len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | { |
| 202 | struct net_local *lp = card->netif; |
| 203 | struct sk_buff *skb; |
| 204 | |
| 205 | if (!lp) |
| 206 | return; /* non existing device */ |
| 207 | |
| 208 | lp->stats.rx_bytes += len; |
| 209 | |
| 210 | skb = dev_alloc_skb(len); |
| 211 | if (skb == NULL) { |
| 212 | printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n", |
| 213 | lp->netdev.name); |
| 214 | lp->stats.rx_dropped++; |
| 215 | return; |
| 216 | } |
| 217 | skb->dev = &lp->netdev; |
| 218 | |
| 219 | /* copy the data */ |
| 220 | memcpy(skb_put(skb, len), buf, len); |
| 221 | |
| 222 | /* determine the used protocol */ |
| 223 | skb->protocol = eth_type_trans(skb, &lp->netdev); |
| 224 | |
| 225 | netif_rx(skb); |
| 226 | lp->stats.rx_packets++; /* adjust packet count */ |
| 227 | |
| 228 | } /* hysdn_rx_netpkt */ |
| 229 | |
| 230 | /*****************************************************/ |
| 231 | /* return the pointer to a network packet to be send */ |
| 232 | /*****************************************************/ |
| 233 | struct sk_buff * |
| 234 | hysdn_tx_netget(hysdn_card * card) |
| 235 | { |
| 236 | struct net_local *lp = card->netif; |
| 237 | |
| 238 | if (!lp) |
| 239 | return (NULL); /* non existing device */ |
| 240 | |
| 241 | if (!lp->sk_count) |
| 242 | return (NULL); /* nothing available */ |
| 243 | |
| 244 | return (lp->skbs[lp->out_idx]); /* next packet to send */ |
| 245 | } /* hysdn_tx_netget */ |
| 246 | |
| 247 | |
| 248 | /*******************************************/ |
| 249 | /* init function called by register device */ |
| 250 | /*******************************************/ |
| 251 | static int |
| 252 | net_init(struct net_device *dev) |
| 253 | { |
| 254 | /* setup the function table */ |
| 255 | dev->open = net_open; |
| 256 | dev->stop = net_close; |
| 257 | dev->hard_start_xmit = net_send_packet; |
| 258 | dev->get_stats = net_get_stats; |
| 259 | |
| 260 | /* Fill in the fields of the device structure with ethernet values. */ |
| 261 | ether_setup(dev); |
| 262 | |
| 263 | return (0); /* success */ |
| 264 | } /* net_init */ |
| 265 | |
| 266 | /*****************************************************************************/ |
| 267 | /* hysdn_net_create creates a new net device for the given card. If a device */ |
| 268 | /* already exists, it will be deleted and created a new one. The return value */ |
| 269 | /* 0 announces success, else a negative error code will be returned. */ |
| 270 | /*****************************************************************************/ |
| 271 | int |
| 272 | hysdn_net_create(hysdn_card * card) |
| 273 | { |
| 274 | struct net_device *dev; |
| 275 | int i; |
| 276 | if(!card) { |
| 277 | printk(KERN_WARNING "No card-pt in hysdn_net_create!\n"); |
| 278 | return (-ENOMEM); |
| 279 | } |
| 280 | hysdn_net_release(card); /* release an existing net device */ |
| 281 | if ((dev = kmalloc(sizeof(struct net_local), GFP_KERNEL)) == NULL) { |
| 282 | printk(KERN_WARNING "HYSDN: unable to allocate mem\n"); |
| 283 | return (-ENOMEM); |
| 284 | } |
| 285 | memset(dev, 0, sizeof(struct net_local)); /* clean the structure */ |
| 286 | |
| 287 | spin_lock_init(&((struct net_local *) dev)->lock); |
| 288 | |
| 289 | /* initialise necessary or informing fields */ |
| 290 | dev->base_addr = card->iobase; /* IO address */ |
| 291 | dev->irq = card->irq; /* irq */ |
| 292 | dev->init = net_init; /* the init function of the device */ |
| 293 | if(dev->name) { |
| 294 | strcpy(dev->name, ((struct net_local *) dev)->dev_name); |
| 295 | } |
| 296 | if ((i = register_netdev(dev))) { |
| 297 | printk(KERN_WARNING "HYSDN: unable to create network device\n"); |
| 298 | kfree(dev); |
| 299 | return (i); |
| 300 | } |
| 301 | dev->priv = card; /* remember pointer to own data structure */ |
| 302 | card->netif = dev; /* setup the local pointer */ |
| 303 | |
| 304 | if (card->debug_flags & LOG_NET_INIT) |
| 305 | hysdn_addlog(card, "network device created"); |
| 306 | return (0); /* and return success */ |
| 307 | } /* hysdn_net_create */ |
| 308 | |
| 309 | /***************************************************************************/ |
| 310 | /* hysdn_net_release deletes the net device for the given card. The return */ |
| 311 | /* value 0 announces success, else a negative error code will be returned. */ |
| 312 | /***************************************************************************/ |
| 313 | int |
| 314 | hysdn_net_release(hysdn_card * card) |
| 315 | { |
| 316 | struct net_device *dev = card->netif; |
| 317 | |
| 318 | if (!dev) |
| 319 | return (0); /* non existing */ |
| 320 | |
| 321 | card->netif = NULL; /* clear out pointer */ |
| 322 | dev->stop(dev); /* close the device */ |
| 323 | |
| 324 | flush_tx_buffers((struct net_local *) dev); /* empty buffers */ |
| 325 | |
| 326 | unregister_netdev(dev); /* release the device */ |
| 327 | free_netdev(dev); /* release the memory allocated */ |
| 328 | if (card->debug_flags & LOG_NET_INIT) |
| 329 | hysdn_addlog(card, "network device deleted"); |
| 330 | |
| 331 | return (0); /* always successful */ |
| 332 | } /* hysdn_net_release */ |
| 333 | |
| 334 | /*****************************************************************************/ |
| 335 | /* hysdn_net_getname returns a pointer to the name of the network interface. */ |
| 336 | /* if the interface is not existing, a "-" is returned. */ |
| 337 | /*****************************************************************************/ |
| 338 | char * |
| 339 | hysdn_net_getname(hysdn_card * card) |
| 340 | { |
| 341 | struct net_device *dev = card->netif; |
| 342 | |
| 343 | if (!dev) |
| 344 | return ("-"); /* non existing */ |
| 345 | |
| 346 | return (dev->name); |
| 347 | } /* hysdn_net_getname */ |