LXR linux/arch/s390/appldata/appldata_net

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
   4 * Collects accumulated network statistics (Packets received/transmitted,
   5 * dropped, errors, ...).
   6 *
   7 * Copyright IBM Corp. 2003, 2006
   8 *
   9 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
  10 */
  11
  12#include <linux/module.h>
  13#include <linux/init.h>
  14#include <linux/errno.h>
  15#include <linux/kernel_stat.h>
  16#include <linux/netdevice.h>
  17#include <net/net_namespace.h>
  18
  19#include "appldata.h"
  20
  21
  22/*
  23 * Network data
  24 *
  25 * This is accessed as binary data by z/VM. If changes to it can't be avoided,
  26 * the structure version (product ID, see appldata_base.c) needs to be changed
  27 * as well and all documentation and z/VM applications using it must be updated.
  28 *
  29 * The record layout is documented in the Linux for zSeries Device Drivers
  30 * book:
  31 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
  32 */
  33struct appldata_net_sum_data {
  34        u64 timestamp;
  35        u32 sync_count_1;       /* after VM collected the record data, */
  36        u32 sync_count_2;       /* sync_count_1 and sync_count_2 should be the
  37                                   same. If not, the record has been updated on
  38                                   the Linux side while VM was collecting the
  39                                   (possibly corrupt) data */
  40
  41        u32 nr_interfaces;      /* nr. of network interfaces being monitored */
  42
  43        u32 padding;            /* next value is 64-bit aligned, so these */
  44                                /* 4 byte would be padded out by compiler */
  45
  46        u64 rx_packets;         /* total packets received        */
  47        u64 tx_packets;         /* total packets transmitted     */
  48        u64 rx_bytes;           /* total bytes received          */
  49        u64 tx_bytes;           /* total bytes transmitted       */
  50        u64 rx_errors;          /* bad packets received          */
  51        u64 tx_errors;          /* packet transmit problems      */
  52        u64 rx_dropped;         /* no space in linux buffers     */
  53        u64 tx_dropped;         /* no space available in linux   */
  54        u64 collisions;         /* collisions while transmitting */
  55} __packed;
  56
  57
  58/*
  59 * appldata_get_net_sum_data()
  60 *
  61 * gather accumulated network statistics
  62 */
  63static void appldata_get_net_sum_data(void *data)
  64{
  65        int i;
  66        struct appldata_net_sum_data *net_data;
  67        struct net_device *dev;
  68        unsigned long rx_packets, tx_packets, rx_bytes, tx_bytes, rx_errors,
  69                        tx_errors, rx_dropped, tx_dropped, collisions;
  70
  71        net_data = data;
  72        net_data->sync_count_1++;
  73
  74        i = 0;
  75        rx_packets = 0;
  76        tx_packets = 0;
  77        rx_bytes   = 0;
  78        tx_bytes   = 0;
  79        rx_errors  = 0;
  80        tx_errors  = 0;
  81        rx_dropped = 0;
  82        tx_dropped = 0;
  83        collisions = 0;
  84
  85        rcu_read_lock();
  86        for_each_netdev_rcu(&init_net, dev) {
  87                const struct rtnl_link_stats64 *stats;
  88                struct rtnl_link_stats64 temp;
  89
  90                stats = dev_get_stats(dev, &temp);
  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_tod_clock();
 116        net_data->sync_count_2++;
 117}
 118
 119
 120static 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        .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 */
 135static int __init appldata_net_init(void)
 136{
 137        int ret;
 138
 139        ops.data = kzalloc(sizeof(struct appldata_net_sum_data), GFP_KERNEL);
 140        if (!ops.data)
 141                return -ENOMEM;
 142
 143        ret = appldata_register_ops(&ops);
 144        if (ret)
 145                kfree(ops.data);
 146
 147        return ret;
 148}
 149
 150/*
 151 * appldata_net_exit()
 152 *
 153 * unregister ops
 154 */
 155static void __exit appldata_net_exit(void)
 156{
 157        appldata_unregister_ops(&ops);
 158        kfree(ops.data);
 159}
 160
 161
 162module_init(appldata_net_init);
 163module_exit(appldata_net_exit);
 164
 165MODULE_LICENSE("GPL");
 166MODULE_AUTHOR("Gerald Schaefer");
 167MODULE_DESCRIPTION("Linux-VM Monitor Stream, accumulated network statistics");
 168