cregit-Linux how code gets into the kernel

Release 4.14 arch/s390/appldata/appldata_net_sum.c

/*
 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
 * Collects accumulated network statistics (Packets received/transmitted,
 * dropped, errors, ...).
 *
 * Copyright IBM Corp. 2003, 2006
 *
 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/kernel_stat.h>
#include <linux/netdevice.h>
#include <net/net_namespace.h>

#include "appldata.h"


/*
 * Network data
 *
 * This is accessed as binary data by z/VM. If changes to it can't be avoided,
 * the structure version (product ID, see appldata_base.c) needs to be changed
 * as well and all documentation and z/VM applications using it must be updated.
 *
 * The record layout is documented in the Linux for zSeries Device Drivers
 * book:
 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml
 */

struct appldata_net_sum_data {
	
u64 timestamp;
	
u32 sync_count_1;	/* after VM collected the record data, */
	
u32 sync_count_2;	/* sync_count_1 and sync_count_2 should be the
                                   same. If not, the record has been updated on
                                   the Linux side while VM was collecting the
                                   (possibly corrupt) data */

	
u32 nr_interfaces;	/* nr. of network interfaces being monitored */

	
u32 padding;		/* next value is 64-bit aligned, so these */
				/* 4 byte would be padded out by compiler */

	
u64 rx_packets;		/* total packets received        */
	
u64 tx_packets;		/* total packets transmitted     */
	
u64 rx_bytes;		/* total bytes received          */
	
u64 tx_bytes;		/* total bytes transmitted       */
	
u64 rx_errors;		/* bad packets received          */
	
u64 tx_errors;		/* packet transmit problems      */
	
u64 rx_dropped;		/* no space in linux buffers     */
	
u64 tx_dropped;		/* no space available in linux   */
	
u64 collisions;		/* collisions while transmitting */

} __packed;


/*
 * appldata_get_net_sum_data()
 *
 * gather accumulated network statistics
 */

static void appldata_get_net_sum_data(void *data) { int i; struct appldata_net_sum_data *net_data; struct net_device *dev; unsigned long rx_packets, tx_packets, rx_bytes, tx_bytes, rx_errors, tx_errors, rx_dropped, tx_dropped, collisions; net_data = data; net_data->sync_count_1++; i = 0; rx_packets = 0; tx_packets = 0; rx_bytes = 0; tx_bytes = 0; rx_errors = 0; tx_errors = 0; rx_dropped = 0; tx_dropped = 0; collisions = 0; rcu_read_lock(); for_each_netdev_rcu(&init_net, dev) { const struct rtnl_link_stats64 *stats; struct rtnl_link_stats64 temp; stats = dev_get_stats(dev, &temp); rx_packets += stats->rx_packets; tx_packets += stats->tx_packets; rx_bytes += stats->rx_bytes; tx_bytes += stats->tx_bytes; rx_errors += stats->rx_errors; tx_errors += stats->tx_errors; rx_dropped += stats->rx_dropped; tx_dropped += stats->tx_dropped; collisions += stats->collisions; i++; } rcu_read_unlock(); net_data->nr_interfaces = i; net_data->rx_packets = rx_packets; net_data->tx_packets = tx_packets; net_data->rx_bytes = rx_bytes; net_data->tx_bytes = tx_bytes; net_data->rx_errors = rx_errors; net_data->tx_errors = tx_errors; net_data->rx_dropped = rx_dropped; net_data->tx_dropped = tx_dropped; net_data->collisions = collisions; net_data->timestamp = get_tod_clock(); net_data->sync_count_2++; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton22889.41%112.50%
Heiko Carstens93.53%225.00%
Stephen Hemminger72.75%225.00%
Eric Dumazet62.35%112.50%
Pavel Emelyanov31.18%112.50%
Eric W. Biedermann20.78%112.50%
Total255100.00%8100.00%

static struct appldata_ops ops = { .name = "net_sum", .record_nr = APPLDATA_RECORD_NET_SUM_ID, .size = sizeof(struct appldata_net_sum_data), .callback = &appldata_get_net_sum_data, .owner = THIS_MODULE, .mod_lvl = {0xF0, 0xF0}, /* EBCDIC "00" */ }; /* * appldata_net_init() * * init data, register ops */
static int __init appldata_net_init(void) { int ret; ops.data = kzalloc(sizeof(struct appldata_net_sum_data), GFP_KERNEL); if (!ops.data) return -ENOMEM; ret = appldata_register_ops(&ops); if (ret) kfree(ops.data); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Sebastian Ott4473.33%133.33%
Andrew Morton1525.00%133.33%
Gerald Schaefer11.67%133.33%
Total60100.00%3100.00%

/* * appldata_net_exit() * * unregister ops */
static void __exit appldata_net_exit(void) { appldata_unregister_ops(&ops); kfree(ops.data); }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton1568.18%150.00%
Sebastian Ott731.82%150.00%
Total22100.00%2100.00%

module_init(appldata_net_init); module_exit(appldata_net_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Gerald Schaefer"); MODULE_DESCRIPTION("Linux-VM Monitor Stream, accumulated network statistics");

Overall Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton40280.72%215.38%
Sebastian Ott5210.44%17.69%
Gerald Schaefer132.61%215.38%
Heiko Carstens102.01%323.08%
Stephen Hemminger71.41%215.38%
Eric Dumazet61.20%17.69%
Eric W. Biedermann51.00%17.69%
Pavel Emelyanov30.60%17.69%
Total498100.00%13100.00%
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