diff options
Diffstat (limited to 'arch/ia64/hp/sim/simeth.c')
| -rw-r--r-- | arch/ia64/hp/sim/simeth.c | 510 |
1 files changed, 0 insertions, 510 deletions
diff --git a/arch/ia64/hp/sim/simeth.c b/arch/ia64/hp/sim/simeth.c deleted file mode 100644 index f39ef2b4ed72..000000000000 --- a/arch/ia64/hp/sim/simeth.c +++ /dev/null @@ -1,510 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Simulated Ethernet Driver - * - * Copyright (C) 1999-2001, 2003 Hewlett-Packard Co - * Stephane Eranian <eranian@hpl.hp.com> - */ -#include <linux/kernel.h> -#include <linux/sched.h> -#include <linux/types.h> -#include <linux/in.h> -#include <linux/string.h> -#include <linux/init.h> -#include <linux/errno.h> -#include <linux/interrupt.h> -#include <linux/netdevice.h> -#include <linux/etherdevice.h> -#include <linux/inetdevice.h> -#include <linux/if_ether.h> -#include <linux/if_arp.h> -#include <linux/skbuff.h> -#include <linux/notifier.h> -#include <linux/bitops.h> -#include <asm/irq.h> -#include <asm/hpsim.h> - -#include "hpsim_ssc.h" - -#define SIMETH_RECV_MAX 10 - -/* - * Maximum possible received frame for Ethernet. - * We preallocate an sk_buff of that size to avoid costly - * memcpy for temporary buffer into sk_buff. We do basically - * what's done in other drivers, like eepro with a ring. - * The difference is, of course, that we don't have real DMA !!! - */ -#define SIMETH_FRAME_SIZE ETH_FRAME_LEN - - -#define NETWORK_INTR 8 - -struct simeth_local { - struct net_device_stats stats; - int simfd; /* descriptor in the simulator */ -}; - -static int simeth_probe1(void); -static int simeth_open(struct net_device *dev); -static int simeth_close(struct net_device *dev); -static int simeth_tx(struct sk_buff *skb, struct net_device *dev); -static int simeth_rx(struct net_device *dev); -static struct net_device_stats *simeth_get_stats(struct net_device *dev); -static irqreturn_t simeth_interrupt(int irq, void *dev_id); -static void set_multicast_list(struct net_device *dev); -static int simeth_device_event(struct notifier_block *this,unsigned long event, void *ptr); - -static char *simeth_version="0.3"; - -/* - * This variable is used to establish a mapping between the Linux/ia64 kernel - * and the host linux kernel. - * - * As of today, we support only one card, even though most of the code - * is ready for many more. The mapping is then: - * linux/ia64 -> linux/x86 - * eth0 -> eth1 - * - * In the future, we some string operations, we could easily support up - * to 10 cards (0-9). - * - * The default mapping can be changed on the kernel command line by - * specifying simeth=ethX (or whatever string you want). - */ -static char *simeth_device="eth0"; /* default host interface to use */ - - - -static volatile unsigned int card_count; /* how many cards "found" so far */ -static int simeth_debug; /* set to 1 to get debug information */ - -/* - * Used to catch IFF_UP & IFF_DOWN events - */ -static struct notifier_block simeth_dev_notifier = { - simeth_device_event, - NULL -}; - - -/* - * Function used when using a kernel command line option. - * - * Format: simeth=interface_name (like eth0) - */ -static int __init -simeth_setup(char *str) -{ - simeth_device = str; - return 1; -} - -__setup("simeth=", simeth_setup); - -/* - * Function used to probe for simeth devices when not installed - * as a loadable module - */ - -int __init -simeth_probe (void) -{ - int r; - - printk(KERN_INFO "simeth: v%s\n", simeth_version); - - r = simeth_probe1(); - - if (r == 0) register_netdevice_notifier(&simeth_dev_notifier); - - return r; -} - -static inline int -netdev_probe(char *name, unsigned char *ether) -{ - return ia64_ssc(__pa(name), __pa(ether), 0,0, SSC_NETDEV_PROBE); -} - - -static inline int -netdev_attach(int fd, int irq, unsigned int ipaddr) -{ - /* this puts the host interface in the right mode (start interrupting) */ - return ia64_ssc(fd, ipaddr, 0,0, SSC_NETDEV_ATTACH); -} - - -static inline int -netdev_detach(int fd) -{ - /* - * inactivate the host interface (don't interrupt anymore) */ - return ia64_ssc(fd, 0,0,0, SSC_NETDEV_DETACH); -} - -static inline int -netdev_send(int fd, unsigned char *buf, unsigned int len) -{ - return ia64_ssc(fd, __pa(buf), len, 0, SSC_NETDEV_SEND); -} - -static inline int -netdev_read(int fd, unsigned char *buf, unsigned int len) -{ - return ia64_ssc(fd, __pa(buf), len, 0, SSC_NETDEV_RECV); -} - -static const struct net_device_ops simeth_netdev_ops = { - .ndo_open = simeth_open, - .ndo_stop = simeth_close, - .ndo_start_xmit = simeth_tx, - .ndo_get_stats = simeth_get_stats, - .ndo_set_rx_mode = set_multicast_list, /* not yet used */ - -}; - -/* - * Function shared with module code, so cannot be in init section - * - * So far this function "detects" only one card (test_&_set) but could - * be extended easily. - * - * Return: - * - -ENODEV is no device found - * - -ENOMEM is no more memory - * - 0 otherwise - */ -static int -simeth_probe1(void) -{ - unsigned char mac_addr[ETH_ALEN]; - struct simeth_local *local; - struct net_device *dev; - int fd, err, rc; - - /* - * XXX Fix me - * let's support just one card for now - */ - if (test_and_set_bit(0, &card_count)) - return -ENODEV; - - /* - * check with the simulator for the device - */ - fd = netdev_probe(simeth_device, mac_addr); - if (fd == -1) - return -ENODEV; - - dev = alloc_etherdev(sizeof(struct simeth_local)); - if (!dev) - return -ENOMEM; - - memcpy(dev->dev_addr, mac_addr, sizeof(mac_addr)); - - local = netdev_priv(dev); - local->simfd = fd; /* keep track of underlying file descriptor */ - - dev->netdev_ops = &simeth_netdev_ops; - - err = register_netdev(dev); - if (err) { - free_netdev(dev); - return err; - } - - /* - * attach the interrupt in the simulator, this does enable interrupts - * until a netdev_attach() is called - */ - if ((rc = hpsim_get_irq(NETWORK_INTR)) < 0) - panic("%s: out of interrupt vectors!\n", __func__); - dev->irq = rc; - - printk(KERN_INFO "%s: hosteth=%s simfd=%d, HwAddr=%pm, IRQ %d\n", - dev->name, simeth_device, local->simfd, dev->dev_addr, dev->irq); - - return 0; -} - -/* - * actually binds the device to an interrupt vector - */ -static int -simeth_open(struct net_device *dev) -{ - if (request_irq(dev->irq, simeth_interrupt, 0, "simeth", dev)) { - printk(KERN_WARNING "simeth: unable to get IRQ %d.\n", dev->irq); - return -EAGAIN; - } - - netif_start_queue(dev); - - return 0; -} - -/* copied from lapbether.c */ -static __inline__ int dev_is_ethdev(struct net_device *dev) -{ - return ( dev->type == ARPHRD_ETHER && strncmp(dev->name, "dummy", 5)); -} - - -/* - * Handler for IFF_UP or IFF_DOWN - * - * The reason for that is that we don't want to be interrupted when the - * interface is down. There is no way to unconnect in the simualtor. Instead - * we use this function to shutdown packet processing in the frame filter - * in the simulator. Thus no interrupts are generated - * - * - * That's also the place where we pass the IP address of this device to the - * simulator so that that we can start filtering packets for it - * - * There may be a better way of doing this, but I don't know which yet. - */ -static int -simeth_device_event(struct notifier_block *this,unsigned long event, void *ptr) -{ - struct net_device *dev = netdev_notifier_info_to_dev(ptr); - struct simeth_local *local; - struct in_device *in_dev; - struct in_ifaddr **ifap = NULL; - struct in_ifaddr *ifa = NULL; - int r; - - - if ( ! dev ) { - printk(KERN_WARNING "simeth_device_event dev=0\n"); - return NOTIFY_DONE; - } - - if (dev_net(dev) != &init_net) - return NOTIFY_DONE; - - if ( event != NETDEV_UP && event != NETDEV_DOWN ) return NOTIFY_DONE; - - /* - * Check whether or not it's for an ethernet device - * - * XXX Fixme: This works only as long as we support one - * type of ethernet device. - */ - if ( !dev_is_ethdev(dev) ) return NOTIFY_DONE; - - if ((in_dev=dev->ip_ptr) != NULL) { - for (ifap=&in_dev->ifa_list; (ifa=*ifap) != NULL; ifap=&ifa->ifa_next) - if (strcmp(dev->name, ifa->ifa_label) == 0) break; - } - if ( ifa == NULL ) { - printk(KERN_ERR "simeth_open: can't find device %s's ifa\n", dev->name); - return NOTIFY_DONE; - } - - printk(KERN_INFO "simeth_device_event: %s ipaddr=0x%x\n", - dev->name, ntohl(ifa->ifa_local)); - - /* - * XXX Fix me - * if the device was up, and we're simply reconfiguring it, not sure - * we get DOWN then UP. - */ - - local = netdev_priv(dev); - /* now do it for real */ - r = event == NETDEV_UP ? - netdev_attach(local->simfd, dev->irq, ntohl(ifa->ifa_local)): - netdev_detach(local->simfd); - - printk(KERN_INFO "simeth: netdev_attach/detach: event=%s ->%d\n", - event == NETDEV_UP ? "attach":"detach", r); - - return NOTIFY_DONE; -} - -static int -simeth_close(struct net_device *dev) -{ - netif_stop_queue(dev); - - free_irq(dev->irq, dev); - - return 0; -} - -/* - * Only used for debug - */ -static void -frame_print(unsigned char *from, unsigned char *frame, int len) -{ - int i; - - printk("%s: (%d) %02x", from, len, frame[0] & 0xff); - for(i=1; i < 6; i++ ) { - printk(":%02x", frame[i] &0xff); - } - printk(" %2x", frame[6] &0xff); - for(i=7; i < 12; i++ ) { - printk(":%02x", frame[i] &0xff); - } - printk(" [%02x%02x]\n", frame[12], frame[13]); - - for(i=14; i < len; i++ ) { - printk("%02x ", frame[i] &0xff); - if ( (i%10)==0) printk("\n"); - } - printk("\n"); -} - - -/* - * Function used to transmit of frame, very last one on the path before - * going to the simulator. - */ -static int -simeth_tx(struct sk_buff *skb, struct net_device *dev) -{ - struct simeth_local *local = netdev_priv(dev); - -#if 0 - /* ensure we have at least ETH_ZLEN bytes (min frame size) */ - unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN; - /* Where do the extra padding bytes comes from inthe skbuff ? */ -#else - /* the real driver in the host system is going to take care of that - * or maybe it's the NIC itself. - */ - unsigned int length = skb->len; -#endif - - local->stats.tx_bytes += skb->len; - local->stats.tx_packets++; - - - if (simeth_debug > 5) frame_print("simeth_tx", skb->data, length); - - netdev_send(local->simfd, skb->data, length); - - /* - * we are synchronous on write, so we don't simulate a - * trasnmit complete interrupt, thus we don't need to arm a tx - */ - - dev_kfree_skb(skb); - return NETDEV_TX_OK; -} - -static inline struct sk_buff * -make_new_skb(struct net_device *dev) -{ - struct sk_buff *nskb; - - /* - * The +2 is used to make sure that the IP header is nicely - * aligned (on 4byte boundary I assume 14+2=16) - */ - nskb = dev_alloc_skb(SIMETH_FRAME_SIZE + 2); - if ( nskb == NULL ) { - printk(KERN_NOTICE "%s: memory squeeze. dropping packet.\n", dev->name); - return NULL; - } - - skb_reserve(nskb, 2); /* Align IP on 16 byte boundaries */ - - skb_put(nskb,SIMETH_FRAME_SIZE); - - return nskb; -} - -/* - * called from interrupt handler to process a received frame - */ -static int -simeth_rx(struct net_device *dev) -{ - struct simeth_local *local; - struct sk_buff *skb; - int len; - int rcv_count = SIMETH_RECV_MAX; - - local = netdev_priv(dev); - /* - * the loop concept has been borrowed from other drivers - * looks to me like it's a throttling thing to avoid pushing to many - * packets at one time into the stack. Making sure we can process them - * upstream and make forward progress overall - */ - do { - if ( (skb=make_new_skb(dev)) == NULL ) { - printk(KERN_NOTICE "%s: memory squeeze. dropping packet.\n", dev->name); - local->stats.rx_dropped++; - return 0; - } - /* - * Read only one frame at a time - */ - len = netdev_read(local->simfd, skb->data, SIMETH_FRAME_SIZE); - if ( len == 0 ) { - if ( simeth_debug > 0 ) printk(KERN_WARNING "%s: count=%d netdev_read=0\n", - dev->name, SIMETH_RECV_MAX-rcv_count); - break; - } -#if 0 - /* - * XXX Fix me - * Should really do a csum+copy here - */ - skb_copy_to_linear_data(skb, frame, len); -#endif - skb->protocol = eth_type_trans(skb, dev); - - if ( simeth_debug > 6 ) frame_print("simeth_rx", skb->data, len); - - /* - * push the packet up & trigger software interrupt - */ - netif_rx(skb); - - local->stats.rx_packets++; - local->stats.rx_bytes += len; - - } while ( --rcv_count ); - - return len; /* 0 = nothing left to read, otherwise, we can try again */ -} - -/* - * Interrupt handler (Yes, we can do it too !!!) - */ -static irqreturn_t -simeth_interrupt(int irq, void *dev_id) -{ - struct net_device *dev = dev_id; - - /* - * very simple loop because we get interrupts only when receiving - */ - while (simeth_rx(dev)); - return IRQ_HANDLED; -} - -static struct net_device_stats * -simeth_get_stats(struct net_device *dev) -{ - struct simeth_local *local = netdev_priv(dev); - - return &local->stats; -} - -/* fake multicast ability */ -static void -set_multicast_list(struct net_device *dev) -{ - printk(KERN_WARNING "%s: set_multicast_list called\n", dev->name); -} - -__initcall(simeth_probe); |