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/errno.h>
  16 #include <linux/kernel_stat.h>
  17 #include <linux/netdevice.h>
  18 #include <net/net_namespace.h>
  19
  20 #include "appldata.h"
  21
  22
  23 /*
  24  * Network data
  25  *
  26  * This is accessed as binary data by z/VM. If changes to it can't be avoided,
  27  * the structure version (product ID, see appldata_base.c) needs to be changed
  28  * as well and all documentation and z/VM applications using it must be updated.
  29  *
  30  * The record layout is documented in the Linux for zSeries Device Drivers
  31  * book:
  32  * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
  33  */
  34 static struct appldata_net_sum_data {
  35         u64 timestamp;
  36         u32 sync_count_1;       /* after VM collected the record data, */
  37         u32 sync_count_2;       /* sync_count_1 and sync_count_2 should be the
  38                                    same. If not, the record has been updated on
  39                                    the Linux side while VM was collecting the
  40                                    (possibly corrupt) data */
  41
  42         u32 nr_interfaces;      /* nr. of network interfaces being monitored */
  43
  44         u32 padding;            /* next value is 64-bit aligned, so these */
  45                                 /* 4 byte would be padded out by compiler */
  46
  47         u64 rx_packets;         /* total packets received        */
  48         u64 tx_packets;         /* total packets transmitted     */
  49         u64 rx_bytes;           /* total bytes received          */
  50         u64 tx_bytes;           /* total bytes transmitted       */
  51         u64 rx_errors;          /* bad packets received          */
  52         u64 tx_errors;          /* packet transmit problems      */
  53         u64 rx_dropped;         /* no space in linux buffers     */
  54         u64 tx_dropped;         /* no space available in linux   */
  55         u64 collisions;         /* collisions while transmitting */
  56 } __attribute__((packed)) appldata_net_sum_data;
  57
  58
  59 /*
  60  * appldata_get_net_sum_data()
  61  *
  62  * gather accumulated network statistics
  63  */
  64 static void appldata_get_net_sum_data(void *data)
  65 {
  66         int i;
  67         struct appldata_net_sum_data *net_data;
  68         struct net_device *dev;
  69         unsigned long rx_packets, tx_packets, rx_bytes, tx_bytes, rx_errors,
  70                         tx_errors, rx_dropped, tx_dropped, collisions;
  71
  72         net_data = data;
  73         net_data->sync_count_1++;
  74
  75         i = 0;
  76         rx_packets = 0;
  77         tx_packets = 0;
  78         rx_bytes   = 0;
  79         tx_bytes   = 0;
  80         rx_errors  = 0;
  81         tx_errors  = 0;
  82         rx_dropped = 0;
  83         tx_dropped = 0;
  84         collisions = 0;
  85
  86         rcu_read_lock();
  87         for_each_netdev_rcu(&init_net, dev) {
  88                 const struct net_device_stats *stats = dev_get_stats(dev);
  89
  90                 rx_packets += stats->rx_packets;
  91                 tx_packets += stats->tx_packets;
  92                 rx_bytes   += stats->rx_bytes;
  93                 tx_bytes   += stats->tx_bytes;
  94                 rx_errors  += stats->rx_errors;
  95                 tx_errors  += stats->tx_errors;
  96                 rx_dropped += stats->rx_dropped;
  97                 tx_dropped += stats->tx_dropped;
  98                 collisions += stats->collisions;
  99                 i++;
 100         }
 101         rcu_read_unlock();
 102
 103         net_data->nr_interfaces = i;
 104         net_data->rx_packets = rx_packets;
 105         net_data->tx_packets = tx_packets;
 106         net_data->rx_bytes   = rx_bytes;
 107         net_data->tx_bytes   = tx_bytes;
 108         net_data->rx_errors  = rx_errors;
 109         net_data->tx_errors  = tx_errors;
 110         net_data->rx_dropped = rx_dropped;
 111         net_data->tx_dropped = tx_dropped;
 112         net_data->collisions = collisions;
 113
 114         net_data->timestamp = get_clock();
 115         net_data->sync_count_2++;
 116 }
 117
 118
 119 static struct appldata_ops ops = {
 120         .name      = "net_sum",
 121         .record_nr = APPLDATA_RECORD_NET_SUM_ID,
 122         .size      = sizeof(struct appldata_net_sum_data),
 123         .callback  = &appldata_get_net_sum_data,
 124         .data      = &appldata_net_sum_data,
 125         .owner     = THIS_MODULE,
 126         .mod_lvl   = {0xF0, 0xF0},              /* EBCDIC "00" */
 127 };
 128
 129
 130 /*
 131  * appldata_net_init()
 132  *
 133  * init data, register ops
 134  */
 135 static int __init appldata_net_init(void)
 136 {
 137         return appldata_register_ops(&ops);
 138 }
 139
 140 /*
 141  * appldata_net_exit()
 142  *
 143  * unregister ops
 144  */
 145 static void __exit appldata_net_exit(void)
 146 {
 147         appldata_unregister_ops(&ops);
 148 }
 149
 150
 151 module_init(appldata_net_init);
 152 module_exit(appldata_net_exit);
 153
 154 MODULE_LICENSE("GPL");
 155 MODULE_AUTHOR("Gerald Schaefer");
 156 MODULE_DESCRIPTION("Linux-VM Monitor Stream, accumulated network statistics");