arch/s390/appldata/appldata_net_sum.c

   1 /*
   2  * arch/s390/appldata/appldata_net_sum.c
   3  *
   4  * Data gathering module for Linux-VM Monitor Stream, Stage 1.
   5  * Collects accumulated network statistics (Packets received/transmitted,
   6  * dropped, errors, ...).
   7  *
   8  * Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH.
   9  *
  10  * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/slab.h>
  16 #include <linux/errno.h>
  17 #include <linux/kernel_stat.h>
  18 #include <linux/netdevice.h>
  19
  20 #include "appldata.h"
  21
  22
  23 #define MY_PRINT_NAME   "appldata_net_sum"      /* for debug messages, etc. */
  24
  25
  26 /*
  27  * Network data
  28  *
  29  * This is accessed as binary data by z/VM. If changes to it can't be avoided,
  30  * the structure version (product ID, see appldata_base.c) needs to be changed
  31  * as well and all documentation and z/VM applications using it must be updated.
  32  *
  33  * The record layout is documented in the Linux for zSeries Device Drivers
  34  * book:
  35  * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
  36  */
  37 static struct appldata_net_sum_data {
  38         u64 timestamp;
  39         u32 sync_count_1;       /* after VM collected the record data, */
  40         u32 sync_count_2;       /* sync_count_1 and sync_count_2 should be the
  41                                    same. If not, the record has been updated on
  42                                    the Linux side while VM was collecting the
  43                                    (possibly corrupt) data */
  44
  45         u32 nr_interfaces;      /* nr. of network interfaces being monitored */
  46
  47         u32 padding;            /* next value is 64-bit aligned, so these */
  48                                 /* 4 byte would be padded out by compiler */
  49
  50         u64 rx_packets;         /* total packets received        */
  51         u64 tx_packets;         /* total packets transmitted     */
  52         u64 rx_bytes;           /* total bytes received          */
  53         u64 tx_bytes;           /* total bytes transmitted       */
  54         u64 rx_errors;          /* bad packets received          */
  55         u64 tx_errors;          /* packet transmit problems      */
  56         u64 rx_dropped;         /* no space in linux buffers     */
  57         u64 tx_dropped;         /* no space available in linux   */
  58         u64 collisions;         /* collisions while transmitting */
  59 } __attribute__((packed)) appldata_net_sum_data;
  60
  61
  62 static inline void appldata_print_debug(struct appldata_net_sum_data *net_data)
  63 {
  64         P_DEBUG("--- NET - RECORD ---\n");
  65
  66         P_DEBUG("nr_interfaces = %u\n", net_data->nr_interfaces);
  67         P_DEBUG("rx_packets    = %8lu\n", net_data->rx_packets);
  68         P_DEBUG("tx_packets    = %8lu\n", net_data->tx_packets);
  69         P_DEBUG("rx_bytes      = %8lu\n", net_data->rx_bytes);
  70         P_DEBUG("tx_bytes      = %8lu\n", net_data->tx_bytes);
  71         P_DEBUG("rx_errors     = %8lu\n", net_data->rx_errors);
  72         P_DEBUG("tx_errors     = %8lu\n", net_data->tx_errors);
  73         P_DEBUG("rx_dropped    = %8lu\n", net_data->rx_dropped);
  74         P_DEBUG("tx_dropped    = %8lu\n", net_data->tx_dropped);
  75         P_DEBUG("collisions    = %8lu\n", net_data->collisions);
  76
  77         P_DEBUG("sync_count_1 = %u\n", net_data->sync_count_1);
  78         P_DEBUG("sync_count_2 = %u\n", net_data->sync_count_2);
  79         P_DEBUG("timestamp    = %lX\n", net_data->timestamp);
  80 }
  81
  82 /*
  83  * appldata_get_net_sum_data()
  84  *
  85  * gather accumulated network statistics
  86  */
  87 static void appldata_get_net_sum_data(void *data)
  88 {
  89         int i;
  90         struct appldata_net_sum_data *net_data;
  91         struct net_device *dev;
  92         struct net_device_stats *stats;
  93         unsigned long rx_packets, tx_packets, rx_bytes, tx_bytes, rx_errors,
  94                         tx_errors, rx_dropped, tx_dropped, collisions;
  95
  96         net_data = data;
  97         net_data->sync_count_1++;
  98
  99         i = 0;
 100         rx_packets = 0;
 101         tx_packets = 0;
 102         rx_bytes   = 0;
 103         tx_bytes   = 0;
 104         rx_errors  = 0;
 105         tx_errors  = 0;
 106         rx_dropped = 0;
 107         tx_dropped = 0;
 108         collisions = 0;
 109         read_lock(&dev_base_lock);
 110         for_each_netdev(dev) {
 111                 stats = dev->get_stats(dev);
 112                 rx_packets += stats->rx_packets;
 113                 tx_packets += stats->tx_packets;
 114                 rx_bytes   += stats->rx_bytes;
 115                 tx_bytes   += stats->tx_bytes;
 116                 rx_errors  += stats->rx_errors;
 117                 tx_errors  += stats->tx_errors;
 118                 rx_dropped += stats->rx_dropped;
 119                 tx_dropped += stats->tx_dropped;
 120                 collisions += stats->collisions;
 121                 i++;
 122         }
 123         read_unlock(&dev_base_lock);
 124         net_data->nr_interfaces = i;
 125         net_data->rx_packets = rx_packets;
 126         net_data->tx_packets = tx_packets;
 127         net_data->rx_bytes   = rx_bytes;
 128         net_data->tx_bytes   = tx_bytes;
 129         net_data->rx_errors  = rx_errors;
 130         net_data->tx_errors  = tx_errors;
 131         net_data->rx_dropped = rx_dropped;
 132         net_data->tx_dropped = tx_dropped;
 133         net_data->collisions = collisions;
 134
 135         net_data->timestamp = get_clock();
 136         net_data->sync_count_2++;
 137 #ifdef APPLDATA_DEBUG
 138         appldata_print_debug(net_data);
 139 #endif
 140 }
 141
 142
 143 static struct appldata_ops ops = {
 144         .ctl_nr    = CTL_APPLDATA_NET_SUM,
 145         .name      = "net_sum",
 146         .record_nr = APPLDATA_RECORD_NET_SUM_ID,
 147         .size      = sizeof(struct appldata_net_sum_data),
 148         .callback  = &appldata_get_net_sum_data,
 149         .data      = &appldata_net_sum_data,
 150         .owner     = THIS_MODULE,
 151         .mod_lvl   = {0xF0, 0xF0},              /* EBCDIC "00" */
 152 };
 153
 154
 155 /*
 156  * appldata_net_init()
 157  *
 158  * init data, register ops
 159  */
 160 static int __init appldata_net_init(void)
 161 {
 162         int rc;
 163
 164         P_DEBUG("sizeof(net) = %lu\n", sizeof(struct appldata_net_sum_data));
 165
 166         rc = appldata_register_ops(&ops);
 167         if (rc != 0) {
 168                 P_ERROR("Error registering ops, rc = %i\n", rc);
 169         } else {
 170                 P_DEBUG("%s-ops registered!\n", ops.name);
 171         }
 172         return rc;
 173 }
 174
 175 /*
 176  * appldata_net_exit()
 177  *
 178  * unregister ops
 179  */
 180 static void __exit appldata_net_exit(void)
 181 {
 182         appldata_unregister_ops(&ops);
 183         P_DEBUG("%s-ops unregistered!\n", ops.name);
 184 }
 185
 186
 187 module_init(appldata_net_init);
 188 module_exit(appldata_net_exit);
 189
 190 MODULE_LICENSE("GPL");
 191 MODULE_AUTHOR("Gerald Schaefer");
 192 MODULE_DESCRIPTION("Linux-VM Monitor Stream, accumulated network statistics");