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