/* netdrv_init.c: Initialization for network devices. */ /* Written 1993,1994,1995 by Donald Becker. The author may be reached as becker@cesdis.gsfc.nasa.gov or C/O Center of Excellence in Space Data and Information Sciences Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771 This file contains the initialization for the "pl14+" style ethernet drivers. It should eventually replace most of drivers/net/Space.c. It's primary advantage is that it's able to allocate low-memory buffers. A secondary advantage is that the dangerous NE*000 netcards can reserve their I/O port region before the SCSI probes start. Modifications/additions by Bjorn Ekwall : ethdev_index[MAX_ETH_CARDS] register_netdev() / unregister_netdev() */ #include #include #include #include #include #include #include #include #include #include #include #include /* The network devices currently exist only in the socket namespace, so these entries are unused. The only ones that make sense are open start the ethercard close stop the ethercard ioctl To get statistics, perhaps set the interface port (AUI, BNC, etc.) One can also imagine getting raw packets using read & write but this is probably better handled by a raw packet socket. Given that almost all of these functions are handled in the current socket-based scheme, putting ethercard devices in /dev/ seems pointless. [Removed all support for /dev network devices. When someone adds streams then by magic we get them, but otherwise they are un-needed and a space waste] */ /* The list of used and available "eth" slots (for "eth0", "eth1", etc.) */ #define MAX_ETH_CARDS 16 /* same as the number if irq's in irq2dev[] */ static struct device *ethdev_index[MAX_ETH_CARDS]; unsigned long lance_init(unsigned long mem_start, unsigned long mem_end); unsigned long pi_init(unsigned long mem_start, unsigned long mem_end); unsigned long apricot_init(unsigned long mem_start, unsigned long mem_end); unsigned long dec21040_init(unsigned long mem_start, unsigned long mem_end); /* net_dev_init() is our network device initialization routine. It's called from init/main.c with the start and end of free memory, and returns the new start of free memory. */ unsigned long net_dev_init (unsigned long mem_start, unsigned long mem_end) { /* Network device initialization for devices that must allocate low-memory or contiguous DMA buffers. */ #if defined(CONFIG_LANCE) mem_start = lance_init(mem_start, mem_end); #endif #if defined(CONFIG_PI) mem_start = pi_init(mem_start, mem_end); #endif #if defined(CONFIG_DEC_ELCP) mem_start = dec21040_init(mem_start, mem_end); #endif return mem_start; } /* Fill in the fields of the device structure with ethernet-generic values. If no device structure is passed, a new one is constructed, complete with a SIZEOF_PRIVATE private data area. If an empty string area is passed as dev->name, or a new structure is made, a new name string is constructed. The passed string area should be 8 bytes long. */ struct device * init_etherdev(struct device *dev, int sizeof_priv, unsigned long *mem_startp) { int new_device = 0; int i; /* Use an existing correctly named device in Space.c:dev_base. */ if (dev == NULL) { int alloc_size = sizeof(struct device) + sizeof("eth%d ") + sizeof_priv + 3; struct device *cur_dev; char pname[8]; /* Putative name for the device. */ for (i = 0; i < MAX_ETH_CARDS; ++i) if (ethdev_index[i] == NULL) { sprintf(pname, "eth%d", i); for (cur_dev = dev_base; cur_dev; cur_dev = cur_dev->next) if (strcmp(pname, cur_dev->name) == 0) { dev = cur_dev; dev->init = NULL; sizeof_priv = (sizeof_priv + 3) & ~3; if (mem_startp && *mem_startp ) { dev->priv = (void*) *mem_startp; *mem_startp += sizeof_priv; } else dev->priv = sizeof_priv ? kmalloc(sizeof_priv, GFP_KERNEL) : NULL; if (dev->priv) memset(dev->priv, 0, sizeof_priv); goto found; } } alloc_size &= ~3; /* Round to dword boundary. */ if (mem_startp && *mem_startp ) { dev = (struct device *)*mem_startp; *mem_startp += alloc_size; } else dev = (struct device *)kmalloc(alloc_size, GFP_KERNEL); memset(dev, 0, alloc_size); if (sizeof_priv) dev->priv = (void *) (dev + 1); dev->name = sizeof_priv + (char *)(dev + 1); new_device = 1; } found: /* From the double loop above. */ if (dev->name && ((dev->name[0] == '\0') || (dev->name[0] == ' '))) { for (i = 0; i < MAX_ETH_CARDS; ++i) if (ethdev_index[i] == NULL) { sprintf(dev->name, "eth%d", i); ethdev_index[i] = dev; break; } } ether_setup(dev); /* Hmmm, should this be called here? */ if (new_device) { /* Append the device to the device queue. */ struct device **old_devp = &dev_base; while ((*old_devp)->next) old_devp = & (*old_devp)->next; (*old_devp)->next = dev; dev->next = 0; } return dev; } static int eth_mac_addr(struct device *dev, void * addr) { struct ifreq * ifr = (struct ifreq *) addr; if(dev->start) return -EBUSY; memcpy(dev->dev_addr, ifr->ifr_hwaddr.sa_data,dev->hard_header_len); return 0; } void ether_setup(struct device *dev) { int i; /* Fill in the fields of the device structure with ethernet-generic values. This should be in a common file instead of per-driver. */ for (i = 0; i < DEV_NUMBUFFS; i++) skb_queue_head_init(&dev->buffs[i]); /* register boot-defined "eth" devices */ if (dev->name && (strncmp(dev->name, "eth", 3) == 0)) { i = simple_strtoul(dev->name + 3, NULL, 0); if (ethdev_index[i] == NULL) { ethdev_index[i] = dev; } else if (dev != ethdev_index[i]) { /* Really shouldn't happen! */ printk("ether_setup: Ouch! Someone else took %s\n", dev->name); } } dev->hard_header = eth_header; dev->rebuild_header = eth_rebuild_header; dev->set_mac_address = eth_mac_addr; dev->header_cache = eth_header_cache; dev->type = ARPHRD_ETHER; dev->hard_header_len = ETH_HLEN; dev->mtu = 1500; /* eth_mtu */ dev->addr_len = ETH_ALEN; for (i = 0; i < ETH_ALEN; i++) { dev->broadcast[i]=0xff; } /* New-style flags. */ dev->flags = IFF_BROADCAST|IFF_MULTICAST; dev->family = AF_INET; dev->pa_addr = 0; dev->pa_brdaddr = 0; dev->pa_mask = 0; dev->pa_alen = 4; } #ifdef CONFIG_TR void tr_setup(struct device *dev) { int i; /* Fill in the fields of the device structure with ethernet-generic values. This should be in a common file instead of per-driver. */ for (i = 0; i < DEV_NUMBUFFS; i++) skb_queue_head_init(&dev->buffs[i]); dev->hard_header = tr_header; dev->rebuild_header = tr_rebuild_header; dev->type = ARPHRD_IEEE802; dev->hard_header_len = TR_HLEN; dev->mtu = 2000; /* bug in fragmenter...*/ dev->addr_len = TR_ALEN; for (i = 0; i < TR_ALEN; i++) { dev->broadcast[i]=0xff; } /* New-style flags. */ dev->flags = IFF_BROADCAST; dev->family = AF_INET; dev->pa_addr = 0; dev->pa_brdaddr = 0; dev->pa_mask = 0; dev->pa_alen = 4; } #endif int ether_config(struct device *dev, struct ifmap *map) { if (map->mem_start != (u_long)(-1)) dev->mem_start = map->mem_start; if (map->mem_end != (u_long)(-1)) dev->mem_end = map->mem_end; if (map->base_addr != (u_short)(-1)) dev->base_addr = map->base_addr; if (map->irq != (u_char)(-1)) dev->irq = map->irq; if (map->dma != (u_char)(-1)) dev->dma = map->dma; if (map->port != (u_char)(-1)) dev->if_port = map->port; return 0; } int register_netdev(struct device *dev) { struct device *d = dev_base; unsigned long flags; int i=MAX_ETH_CARDS; save_flags(flags); cli(); if (dev && dev->init) { if (dev->name && ((dev->name[0] == '\0') || (dev->name[0] == ' '))) { for (i = 0; i < MAX_ETH_CARDS; ++i) if (ethdev_index[i] == NULL) { sprintf(dev->name, "eth%d", i); printk("loading device '%s'...\n", dev->name); ethdev_index[i] = dev; break; } } if (dev->init(dev) != 0) { if (i < MAX_ETH_CARDS) ethdev_index[i] = NULL; restore_flags(flags); return -EIO; } /* Add device to end of chain */ if (dev_base) { while (d->next) d = d->next; d->next = dev; } else dev_base = dev; dev->next = NULL; } restore_flags(flags); return 0; } void unregister_netdev(struct device *dev) { struct device *d = dev_base; unsigned long flags; int i; save_flags(flags); cli(); if (dev == NULL) { printk("was NULL\n"); restore_flags(flags); return; } /* else */ if (dev->start) printk("ERROR '%s' busy and not MOD_IN_USE.\n", dev->name); if (dev_base == dev) dev_base = dev->next; else { while (d && (d->next != dev)) d = d->next; if (d && (d->next == dev)) { d->next = dev->next; } else { printk("unregister_netdev: '%s' not found\n", dev->name); restore_flags(flags); return; } for (i = 0; i < MAX_ETH_CARDS; ++i) { if (ethdev_index[i] == dev) { ethdev_index[i] = NULL; break; } } } restore_flags(flags); } /* * Local variables: * compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c net_init.c" * version-control: t * kept-new-versions: 5 * tab-width: 4 * End: */