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 #include <net/net_namespace.h>
  20
  21 #include "appldata.h"
  22
  23
  24 #define MY_PRINT_NAME   "appldata_net_sum"      /* for debug messages, etc. */
  25
  26
  27 /*
  28  * Network data
  29  *
  30  * This is accessed as binary data by z/VM. If changes to it can't be avoided,
  31  * the structure version (product ID, see appldata_base.c) needs to be changed
  32  * as well and all documentation and z/VM applications using it must be updated.
  33  *
  34  * The record layout is documented in the Linux for zSeries Device Drivers
  35  * book:
  36  * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
  37  */
  38 static struct appldata_net_sum_data {
  39         u64 timestamp;
  40         u32 sync_count_1;       /* after VM collected the record data, */
  41         u32 sync_count_2;       /* sync_count_1 and sync_count_2 should be the
  42                                    same. If not, the record has been updated on
  43                                    the Linux side while VM was collecting the
  44                                    (possibly corrupt) data */
  45
  46         u32 nr_interfaces;      /* nr. of network interfaces being monitored */
  47
  48         u32 padding;            /* next value is 64-bit aligned, so these */
  49                                 /* 4 byte would be padded out by compiler */
  50
  51         u64 rx_packets;         /* total packets received        */
  52         u64 tx_packets;         /* total packets transmitted     */
  53         u64 rx_bytes;           /* total bytes received          */
  54         u64 tx_bytes;           /* total bytes transmitted       */
  55         u64 rx_errors;          /* bad packets received          */
  56         u64 tx_errors;          /* packet transmit problems      */
  57         u64 rx_dropped;         /* no space in linux buffers     */
  58         u64 tx_dropped;         /* no space available in linux   */
  59         u64 collisions;         /* collisions while transmitting */
  60 } __attribute__((packed)) appldata_net_sum_data;
  61
  62
  63 static inline void appldata_print_debug(struct appldata_net_sum_data *net_data)
  64 {
  65         P_DEBUG("--- NET - RECORD ---\n");
  66
  67         P_DEBUG("nr_interfaces = %u\n", net_data->nr_interfaces);
  68         P_DEBUG("rx_packets    = %8lu\n", net_data->rx_packets);
  69         P_DEBUG("tx_packets    = %8lu\n", net_data->tx_packets);
  70         P_DEBUG("rx_bytes      = %8lu\n", net_data->rx_bytes);
  71         P_DEBUG("tx_bytes      = %8lu\n", net_data->tx_bytes);
  72         P_DEBUG("rx_errors     = %8lu\n", net_data->rx_errors);
  73         P_DEBUG("tx_errors     = %8lu\n", net_data->tx_errors);
  74         P_DEBUG("rx_dropped    = %8lu\n", net_data->rx_dropped);
  75         P_DEBUG("tx_dropped    = %8lu\n", net_data->tx_dropped);
  76         P_DEBUG("collisions    = %8lu\n", net_data->collisions);
  77
  78         P_DEBUG("sync_count_1 = %u\n", net_data->sync_count_1);
  79         P_DEBUG("sync_count_2 = %u\n", net_data->sync_count_2);
  80         P_DEBUG("timestamp    = %lX\n", net_data->timestamp);
  81 }
  82
  83 /*
  84  * appldata_get_net_sum_data()
  85  *
  86  * gather accumulated network statistics
  87  */
  88 static void appldata_get_net_sum_data(void *data)
  89 {
  90         int i;
  91         struct appldata_net_sum_data *net_data;
  92         struct net_device *dev;
  93         struct net_device_stats *stats;
  94         unsigned long rx_packets, tx_packets, rx_bytes, tx_bytes, rx_errors,
  95                         tx_errors, rx_dropped, tx_dropped, collisions;
  96
  97         net_data = data;
  98         net_data->sync_count_1++;
  99
 100         i = 0;
 101         rx_packets = 0;
 102         tx_packets = 0;
 103         rx_bytes   = 0;
 104         tx_bytes   = 0;
 105         rx_errors  = 0;
 106         tx_errors  = 0;
 107         rx_dropped = 0;
 108         tx_dropped = 0;
 109         collisions = 0;
 110         read_lock(&dev_base_lock);
 111         for_each_netdev(&init_net, dev) {
 112                 stats = dev->get_stats(dev);
 113                 rx_packets += stats->rx_packets;
 114                 tx_packets += stats->tx_packets;
 115                 rx_bytes   += stats->rx_bytes;
 116                 tx_bytes   += stats->tx_bytes;
 117                 rx_errors  += stats->rx_errors;
 118                 tx_errors  += stats->tx_errors;
 119                 rx_dropped += stats->rx_dropped;
 120                 tx_dropped += stats->tx_dropped;
 121                 collisions += stats->collisions;
 122                 i++;
 123         }
 124         read_unlock(&dev_base_lock);
 125         net_data->nr_interfaces = i;
 126         net_data->rx_packets = rx_packets;
 127         net_data->tx_packets = tx_packets;
 128         net_data->rx_bytes   = rx_bytes;
 129         net_data->tx_bytes   = tx_bytes;
 130         net_data->rx_errors  = rx_errors;
 131         net_data->tx_errors  = tx_errors;
 132         net_data->rx_dropped = rx_dropped;
 133         net_data->tx_dropped = tx_dropped;
 134         net_data->collisions = collisions;
 135
 136         net_data->timestamp = get_clock();
 137         net_data->sync_count_2++;
 138 #ifdef APPLDATA_DEBUG
 139         appldata_print_debug(net_data);
 140 #endif
 141 }
 142
 143
 144 static struct appldata_ops ops = {
 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");