net/core/profile.c

   1 #include <linux/config.h>
   2 #include <linux/types.h>
   3 #include <linux/kernel.h>
   4 #include <linux/sched.h>
   5 #include <linux/mm.h>
   6 #include <linux/interrupt.h>
   7 #include <linux/netdevice.h>
   8 #include <linux/string.h>
   9 #include <linux/skbuff.h>
  10 #include <linux/proc_fs.h>
  11 #include <linux/init.h>
  12 #include <linux/ip.h>
  13 #include <linux/inet.h>
  14 #include <net/checksum.h>
  15
  16 #include <asm/processor.h>
  17 #include <asm/uaccess.h>
  18 #include <asm/system.h>
  19
  20 #include <net/profile.h>
  21
  22 #ifdef CONFIG_NET_PROFILE
  23
  24 atomic_t net_profile_active;
  25 struct timeval net_profile_adjust;
  26
  27 NET_PROFILE_DEFINE(total);
  28
  29 struct net_profile_slot *net_profile_chain = &net_prof_total;
  30
  31 #ifdef __alpha__
  32 __u32 alpha_lo;
  33 long alpha_hi;
  34
  35 static void alpha_tick(unsigned long);
  36
  37 static struct timer_list alpha_timer =
  38         { NULL, NULL, 0, 0L, alpha_tick };
  39
  40 void alpha_tick(unsigned long dummy)
  41 {
  42         struct timeval dummy_stamp;
  43         net_profile_stamp(&dummy_stamp);
  44         alpha_timer.expires = jiffies + 4*HZ;
  45         add_timer(&alpha_timer);
  46 }
  47
  48 #endif
  49
  50 void net_profile_irq_adjust(struct timeval *entered, struct timeval* leaved)
  51 {
  52         struct net_profile_slot *s;
  53
  54         net_profile_sub(entered, leaved);
  55         for (s = net_profile_chain; s; s = s->next) {
  56                 if (s->active)
  57                         net_profile_add(leaved, &s->irq);
  58         }
  59 }
  60
  61
  62 #ifdef CONFIG_PROC_FS
  63 static int profile_read_proc(char *buffer, char **start, off_t offset,
  64                              int length, int *eof, void *data)
  65 {
  66         off_t pos=0;
  67         off_t begin=0;
  68         int len=0;
  69         struct net_profile_slot *s;
  70
  71         len+= sprintf(buffer, "Slot            Hits       Hi         Lo         OnIrqHi    OnIrqLo    Ufl\n");
  72
  73         if (offset == 0) {
  74                 cli();
  75                 net_prof_total.active = 1;
  76                 atomic_inc(&net_profile_active);
  77                 NET_PROFILE_LEAVE(total);
  78                 sti();
  79         }
  80         for (s = net_profile_chain; s; s = s->next) {
  81                 struct net_profile_slot tmp;
  82
  83                 cli();
  84                 tmp = *s;
  85
  86                 /* Wrong, but pretty close to truth */
  87
  88                 s->accumulator.tv_sec = 0;
  89                 s->accumulator.tv_usec = 0;
  90                 s->irq.tv_sec = 0;
  91                 s->irq.tv_usec = 0;
  92                 s->hits = 0;
  93                 s->underflow = 0;
  94                 /* Repair active count, it is possible, only if code has a bug */
  95                 if (s->active) {
  96                         s->active = 0;
  97                         atomic_dec(&net_profile_active);
  98                 }
  99                 sti();
 100
 101                 net_profile_sub(&tmp.irq, &tmp.accumulator);
 102
 103                 len += sprintf(buffer+len,"%-15s %-10d %-10ld %-10lu %-10lu %-10lu %d/%d",
 104                                tmp.id,
 105                                tmp.hits,
 106                                tmp.accumulator.tv_sec,
 107                                tmp.accumulator.tv_usec,
 108                                tmp.irq.tv_sec,
 109                                tmp.irq.tv_usec,
 110                                tmp.underflow, tmp.active);
 111
 112                         buffer[len++]='\n';
 113
 114                         pos=begin+len;
 115                         if(pos<offset) {
 116                                 len=0;
 117                                 begin=pos;
 118                         }
 119                         if(pos>offset+length)
 120                                 goto done;
 121         }
 122         *eof = 1;
 123
 124 done:
 125         *start=buffer+(offset-begin);
 126         len-=(offset-begin);
 127         if(len>length)
 128                 len=length;
 129         if (len < 0)
 130                 len = 0;
 131         if (offset == 0) {
 132                 cli();
 133                 net_prof_total.active = 0;
 134                 net_prof_total.hits = 0;
 135                 net_profile_stamp(&net_prof_total.entered);
 136                 sti();
 137         }
 138         return len;
 139 }
 140 #endif
 141
 142 struct iphdr whitehole_iph;
 143 int whitehole_count;
 144
 145 static int whitehole_xmit(struct sk_buff *skb, struct net_device *dev)
 146 {
 147         struct net_device_stats *stats;
 148
 149         stats = (struct net_device_stats *)dev->priv;
 150         stats->tx_packets++;
 151         stats->tx_bytes+=skb->len;
 152
 153         dev_kfree_skb(skb);
 154         return 0;
 155 }
 156
 157 static void whitehole_inject(unsigned long);
 158 int whitehole_init(struct net_device *dev);
 159
 160 static struct timer_list whitehole_timer =
 161         { NULL, NULL, 0, 0L, whitehole_inject };
 162
 163 static struct net_device whitehole_dev = {
 164         "whitehole", 0x0, 0x0, 0x0, 0x0, 0, 0, 0, 0, 0, NULL, whitehole_init, };
 165
 166 static int whitehole_open(struct net_device *dev)
 167 {
 168         whitehole_count = 100000;
 169         whitehole_timer.expires = jiffies + 5*HZ;
 170         add_timer(&whitehole_timer);
 171         return 0;
 172 }
 173
 174 static int whitehole_close(struct net_device *dev)
 175 {
 176         del_timer(&whitehole_timer);
 177         return 0;
 178 }
 179
 180 static void whitehole_inject(unsigned long dummy)
 181 {
 182         struct net_device_stats *stats = (struct net_device_stats *)whitehole_dev.priv;
 183         extern int netdev_dropping;
 184
 185         do {
 186                 struct iphdr *iph;
 187                 struct sk_buff *skb = alloc_skb(128, GFP_ATOMIC);
 188                 if (!skb)
 189                         break;
 190                 skb_reserve(skb, 32);
 191                 iph = (struct iphdr*)skb_put(skb, sizeof(*iph));
 192                 skb->mac.raw = ((u8*)iph) - 14;
 193                 memcpy(iph, &whitehole_iph, sizeof(*iph));
 194                 skb->protocol = __constant_htons(ETH_P_IP);
 195                 skb->dev = &whitehole_dev;
 196                 skb->pkt_type = PACKET_HOST;
 197                 stats->rx_packets++;
 198                 stats->rx_bytes += skb->len;
 199                 netif_rx(skb);
 200                 whitehole_count--;
 201         } while (netdev_dropping == 0 && whitehole_count>0);
 202         if (whitehole_count > 0) {
 203                 whitehole_timer.expires = jiffies + 1;
 204                 add_timer(&whitehole_timer);
 205         }
 206 }
 207
 208 static struct net_device_stats *whitehole_get_stats(struct net_device *dev)
 209 {
 210         struct net_device_stats *stats = (struct net_device_stats *) dev->priv;
 211         return stats;
 212 }
 213
 214 int __init whitehole_init(struct net_device *dev)
 215 {
 216         dev->priv = kmalloc(sizeof(struct net_device_stats), GFP_KERNEL);
 217         if (dev->priv == NULL)
 218                 return -ENOBUFS;
 219         memset(dev->priv, 0, sizeof(struct net_device_stats));
 220         dev->get_stats  = whitehole_get_stats;
 221         dev->hard_start_xmit = whitehole_xmit;
 222         dev->open = whitehole_open;
 223         dev->stop = whitehole_close;
 224         ether_setup(dev);
 225         dev->tx_queue_len = 0;
 226         dev->flags |= IFF_NOARP;
 227         dev->flags &= ~(IFF_BROADCAST|IFF_MULTICAST);
 228         dev->iflink = 0;
 229         whitehole_iph.ihl = 5;
 230         whitehole_iph.version = 4;
 231         whitehole_iph.ttl = 2;
 232         whitehole_iph.saddr = in_aton("193.233.7.21");
 233         whitehole_iph.daddr = in_aton("193.233.7.10");
 234         whitehole_iph.tot_len = htons(20);
 235         whitehole_iph.check = ip_compute_csum((void *)&whitehole_iph, 20);
 236         return 0;
 237 }
 238
 239 int net_profile_register(struct net_profile_slot *slot)
 240 {
 241         cli();
 242         slot->next = net_profile_chain;
 243         net_profile_chain = slot;
 244         sti();
 245         return 0;
 246 }
 247
 248 int net_profile_unregister(struct net_profile_slot *slot)
 249 {
 250         struct net_profile_slot **sp, *s;
 251
 252         for (sp = &net_profile_chain; (s = *sp) != NULL; sp = &s->next) {
 253                 if (s == slot) {
 254                         cli();
 255                         *sp = s->next;
 256                         sti();
 257                         return 0;
 258                 }
 259         }
 260         return -ESRCH;
 261 }
 262
 263
 264 int __init net_profile_init(void)
 265 {
 266         int i;
 267
 268 #ifdef CONFIG_PROC_FS
 269         create_proc_read_entry("net/profile", 0, 0, profile_read_proc, NULL);
 270 #endif
 271
 272         register_netdevice(&whitehole_dev);
 273
 274         printk("Evaluating net profiler cost ...");
 275 #ifdef __alpha__
 276         alpha_tick(0);
 277 #endif
 278         for (i=0; i<1024; i++) {
 279                 NET_PROFILE_ENTER(total);
 280                 NET_PROFILE_LEAVE(total);
 281         }
 282         if (net_prof_total.accumulator.tv_sec) {
 283                 printk(" too high!\n");
 284         } else {
 285                 net_profile_adjust.tv_usec = net_prof_total.accumulator.tv_usec>>10;
 286                 printk("%ld units\n", net_profile_adjust.tv_usec);
 287         }
 288         net_prof_total.hits = 0;
 289         net_profile_stamp(&net_prof_total.entered);
 290         return 0;
 291 }
 292
 293 #endif