arch/s390/appldata/appldata_net_sum.c

   1 /*
   2  * Data gathering module for Linux-VM Monitor Stream, Stage 1.
   3  * Collects accumulated network statistics (Packets received/transmitted,
   4  * dropped, errors, ...).
   5  *
   6  * Copyright IBM Corp. 2003, 2006
   7  *
   8  * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/errno.h>
  14 #include <linux/kernel_stat.h>
  15 #include <linux/netdevice.h>
  16 #include <net/net_namespace.h>
  17
  18 #include "appldata.h"
  19
  20
  21 /*
  22  * Network data
  23  *
  24  * This is accessed as binary data by z/VM. If changes to it can't be avoided,
  25  * the structure version (product ID, see appldata_base.c) needs to be changed
  26  * as well and all documentation and z/VM applications using it must be updated.
  27  *
  28  * The record layout is documented in the Linux for zSeries Device Drivers
  29  * book:
  30  * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
  31  */
  32 struct appldata_net_sum_data {
  33         u64 timestamp;
  34         u32 sync_count_1;       /* after VM collected the record data, */
  35         u32 sync_count_2;       /* sync_count_1 and sync_count_2 should be the
  36                                    same. If not, the record has been updated on
  37                                    the Linux side while VM was collecting the
  38                                    (possibly corrupt) data */
  39
  40         u32 nr_interfaces;      /* nr. of network interfaces being monitored */
  41
  42         u32 padding;            /* next value is 64-bit aligned, so these */
  43                                 /* 4 byte would be padded out by compiler */
  44
  45         u64 rx_packets;         /* total packets received        */
  46         u64 tx_packets;         /* total packets transmitted     */
  47         u64 rx_bytes;           /* total bytes received          */
  48         u64 tx_bytes;           /* total bytes transmitted       */
  49         u64 rx_errors;          /* bad packets received          */
  50         u64 tx_errors;          /* packet transmit problems      */
  51         u64 rx_dropped;         /* no space in linux buffers     */
  52         u64 tx_dropped;         /* no space available in linux   */
  53         u64 collisions;         /* collisions while transmitting */
  54 } __packed;
  55
  56
  57 /*
  58  * appldata_get_net_sum_data()
  59  *
  60  * gather accumulated network statistics
  61  */
  62 static void appldata_get_net_sum_data(void *data)
  63 {
  64         int i;
  65         struct appldata_net_sum_data *net_data;
  66         struct net_device *dev;
  67         unsigned long rx_packets, tx_packets, rx_bytes, tx_bytes, rx_errors,
  68                         tx_errors, rx_dropped, tx_dropped, collisions;
  69
  70         net_data = data;
  71         net_data->sync_count_1++;
  72
  73         i = 0;
  74         rx_packets = 0;
  75         tx_packets = 0;
  76         rx_bytes   = 0;
  77         tx_bytes   = 0;
  78         rx_errors  = 0;
  79         tx_errors  = 0;
  80         rx_dropped = 0;
  81         tx_dropped = 0;
  82         collisions = 0;
  83
  84         rcu_read_lock();
  85         for_each_netdev_rcu(&init_net, dev) {
  86                 const struct rtnl_link_stats64 *stats;
  87                 struct rtnl_link_stats64 temp;
  88
  89                 stats = dev_get_stats(dev, &temp);
  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_tod_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         .owner     = THIS_MODULE,
 125         .mod_lvl   = {0xF0, 0xF0},              /* EBCDIC "00" */
 126 };
 127
 128
 129 /*
 130  * appldata_net_init()
 131  *
 132  * init data, register ops
 133  */
 134 static int __init appldata_net_init(void)
 135 {
 136         int ret;
 137
 138         ops.data = kzalloc(sizeof(struct appldata_net_sum_data), GFP_KERNEL);
 139         if (!ops.data)
 140                 return -ENOMEM;
 141
 142         ret = appldata_register_ops(&ops);
 143         if (ret)
 144                 kfree(ops.data);
 145
 146         return ret;
 147 }
 148
 149 /*
 150  * appldata_net_exit()
 151  *
 152  * unregister ops
 153  */
 154 static void __exit appldata_net_exit(void)
 155 {
 156         appldata_unregister_ops(&ops);
 157         kfree(ops.data);
 158 }
 159
 160
 161 module_init(appldata_net_init);
 162 module_exit(appldata_net_exit);
 163
 164 MODULE_LICENSE("GPL");
 165 MODULE_AUTHOR("Gerald Schaefer");
 166 MODULE_DESCRIPTION("Linux-VM Monitor Stream, accumulated network statistics");