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163 lines
4.0 KiB
163 lines
4.0 KiB
// 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 <[email protected]> |
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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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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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