168 lines
4.2 KiB
C
168 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Data gathering module for Linux-VM Monitor Stream, Stage 1.
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* Collects accumulated network statistics (Packets received/transmitted,
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* dropped, errors, ...).
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*
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* Copyright IBM Corp. 2003, 2006
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*
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* Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/kernel_stat.h>
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#include <linux/netdevice.h>
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#include <net/net_namespace.h>
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#include "appldata.h"
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/*
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* Network data
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*
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* This is accessed as binary data by z/VM. If changes to it can't be avoided,
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* the structure version (product ID, see appldata_base.c) needs to be changed
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* as well and all documentation and z/VM applications using it must be updated.
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*
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* The record layout is documented in the Linux for zSeries Device Drivers
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* book:
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* http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
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*/
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struct appldata_net_sum_data {
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u64 timestamp;
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u32 sync_count_1; /* after VM collected the record data, */
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u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the
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same. If not, the record has been updated on
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the Linux side while VM was collecting the
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(possibly corrupt) data */
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u32 nr_interfaces; /* nr. of network interfaces being monitored */
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u32 padding; /* next value is 64-bit aligned, so these */
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/* 4 byte would be padded out by compiler */
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u64 rx_packets; /* total packets received */
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u64 tx_packets; /* total packets transmitted */
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u64 rx_bytes; /* total bytes received */
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u64 tx_bytes; /* total bytes transmitted */
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u64 rx_errors; /* bad packets received */
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u64 tx_errors; /* packet transmit problems */
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u64 rx_dropped; /* no space in linux buffers */
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u64 tx_dropped; /* no space available in linux */
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u64 collisions; /* collisions while transmitting */
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} __packed;
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/*
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* appldata_get_net_sum_data()
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*
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* gather accumulated network statistics
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*/
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static void appldata_get_net_sum_data(void *data)
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{
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int i;
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struct appldata_net_sum_data *net_data;
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struct net_device *dev;
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unsigned long rx_packets, tx_packets, rx_bytes, tx_bytes, rx_errors,
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tx_errors, rx_dropped, tx_dropped, collisions;
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net_data = data;
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net_data->sync_count_1++;
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i = 0;
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rx_packets = 0;
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tx_packets = 0;
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rx_bytes = 0;
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tx_bytes = 0;
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rx_errors = 0;
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tx_errors = 0;
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rx_dropped = 0;
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tx_dropped = 0;
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collisions = 0;
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rcu_read_lock();
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for_each_netdev_rcu(&init_net, dev) {
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const struct rtnl_link_stats64 *stats;
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struct rtnl_link_stats64 temp;
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stats = dev_get_stats(dev, &temp);
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rx_packets += stats->rx_packets;
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tx_packets += stats->tx_packets;
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rx_bytes += stats->rx_bytes;
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tx_bytes += stats->tx_bytes;
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rx_errors += stats->rx_errors;
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tx_errors += stats->tx_errors;
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rx_dropped += stats->rx_dropped;
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tx_dropped += stats->tx_dropped;
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collisions += stats->collisions;
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i++;
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}
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rcu_read_unlock();
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net_data->nr_interfaces = i;
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net_data->rx_packets = rx_packets;
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net_data->tx_packets = tx_packets;
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net_data->rx_bytes = rx_bytes;
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net_data->tx_bytes = tx_bytes;
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net_data->rx_errors = rx_errors;
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net_data->tx_errors = tx_errors;
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net_data->rx_dropped = rx_dropped;
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net_data->tx_dropped = tx_dropped;
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net_data->collisions = collisions;
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net_data->timestamp = get_tod_clock();
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net_data->sync_count_2++;
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}
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static struct appldata_ops ops = {
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.name = "net_sum",
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.record_nr = APPLDATA_RECORD_NET_SUM_ID,
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.size = sizeof(struct appldata_net_sum_data),
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.callback = &appldata_get_net_sum_data,
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.owner = THIS_MODULE,
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.mod_lvl = {0xF0, 0xF0}, /* EBCDIC "00" */
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};
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/*
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* appldata_net_init()
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*
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* init data, register ops
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*/
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static int __init appldata_net_init(void)
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{
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int ret;
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ops.data = kzalloc(sizeof(struct appldata_net_sum_data), GFP_KERNEL);
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if (!ops.data)
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return -ENOMEM;
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ret = appldata_register_ops(&ops);
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if (ret)
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kfree(ops.data);
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return ret;
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}
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/*
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* appldata_net_exit()
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*
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* unregister ops
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*/
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static void __exit appldata_net_exit(void)
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{
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appldata_unregister_ops(&ops);
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kfree(ops.data);
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}
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module_init(appldata_net_init);
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module_exit(appldata_net_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Gerald Schaefer");
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MODULE_DESCRIPTION("Linux-VM Monitor Stream, accumulated network statistics");
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