net: Add network activity statistics tracking from Sony kernel (b037ad4f) · Commits · e / devices / android_kernel_sony_msm8998

include/net/activity_stats.h

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Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2010 Google, Inc.
		*
		* This software is licensed under the terms of the GNU General Public
		* License version 2, as published by the Free Software Foundation, and
		* may be copied, distributed, and modified under those terms.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* Author: Mike Chan (mike@android.com)
		*/
		/*
		* NOTE: This file has been modified by Sony Mobile Communications Inc.
		* Modifications are Copyright (c) 2017 Sony Mobile Communications Inc,
		* and licensed under the license of the file.
		*/

		#ifndef __activity_stats_h
		#define __activity_stats_h

		#ifdef CONFIG_NET_ACTIVITY_STATS
		void activity_stats_update(void);
		#else
		#define activity_stats_update(void) {}
		#endif

		#endif /* _NET_ACTIVITY_STATS_H */

net/Kconfig

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		@@ -102,6 +102,14 @@ config ANDROID_PARANOID_NETWORK
		help
		none

		config NET_ACTIVITY_STATS
		bool "Network activity statistics tracking"
		default y
		help
		Network activity statistics are useful for tracking wireless
		modem activity on 2G, 3G, 4G wireless networks. Counts number of
		transmissions and groups them in specified time buckets.

		config NETWORK_SECMARK
		bool "Security Marking"
		help

net/Makefile

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		@@ -79,3 +79,4 @@ obj-y += l3mdev/
		endif
		obj-$(CONFIG_IPC_ROUTER) += ipc_router/
		obj-$(CONFIG_RMNET_DATA) += rmnet_data/
		obj-$(CONFIG_NET_ACTIVITY_STATS) += activity_stats.o

net/activity_stats.c

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		/* net/activity_stats.c
		*
		* Copyright (C) 2010 Google, Inc.
		*
		* This software is licensed under the terms of the GNU General Public
		* License version 2, as published by the Free Software Foundation, and
		* may be copied, distributed, and modified under those terms.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* Author: Mike Chan (mike@android.com)
		*/
		/*
		* NOTE: This file has been modified by Sony Mobile Communications Inc.
		* Modifications are Copyright (c) 2017 Sony Mobile Communications Inc,
		* and licensed under the license of the file.
		*/

		#include <linux/proc_fs.h>
		#include <linux/seq_file.h>
		#include <linux/suspend.h>
		#include <net/net_namespace.h>

		/*
		* Track transmission rates in buckets (power of 2).
		* 1,2,4,8...512 seconds.
		*
		* Buckets represent the count of network transmissions at least
		* N seconds apart, where N is 1 << bucket index.
		*/
		#define BUCKET_MAX 10

		/* Track network activity frequency */
		static unsigned long activity_stats[BUCKET_MAX];
		static ktime_t last_transmit;
		static ktime_t suspend_time;
		static DEFINE_SPINLOCK(activity_lock);

		void activity_stats_update(void)
		{
		int i;
		unsigned long flags;
		ktime_t now;
		s64 delta;

		spin_lock_irqsave(&activity_lock, flags);
		now = ktime_get();
		delta = ktime_to_ns(ktime_sub(now, last_transmit));

		for (i = BUCKET_MAX - 1; i >= 0; i--) {
		/*
		* Check if the time delta between network activity is within the
		* minimum bucket range.
		*/
		if (delta < (1000000000ULL << i))
		continue;

		activity_stats[i]++;
		last_transmit = now;
		break;
		}
		spin_unlock_irqrestore(&activity_lock, flags);
		}

		static int activity_stats_show(struct seq_file m, void v)
		{
		int i;

		seq_printf(m, "Min Bucket(sec) Count\n");

		for (i = 0; i < BUCKET_MAX; i++) {
		seq_printf(m, "%15d %lu\n", 1 << i, activity_stats[i]);
		}

		return 0;
		}

		static int activity_stats_notifier(struct notifier_block *nb,
		unsigned long event, void *dummy)
		{
		switch (event) {
		case PM_SUSPEND_PREPARE:
		suspend_time = ktime_get_real();
		break;

		case PM_POST_SUSPEND:
		suspend_time = ktime_sub(ktime_get_real(), suspend_time);
		last_transmit = ktime_sub(last_transmit, suspend_time);
		}

		return 0;
		}

		static int activity_stats_open(struct inode inode, struct file file)
		{
		return single_open(file, activity_stats_show, PDE_DATA(inode));
		}

		static const struct file_operations activity_stats_fops = {
		.open = activity_stats_open,
		.read = seq_read,
		.llseek = seq_lseek,
		.release = seq_release,
		};

		static struct notifier_block activity_stats_notifier_block = {
		.notifier_call = activity_stats_notifier,
		};

		static int __init activity_stats_init(void)
		{
		proc_create("activity", S_IRUGO,
		init_net.proc_net_stat, &activity_stats_fops);
		return register_pm_notifier(&activity_stats_notifier_block);
		}

		subsys_initcall(activity_stats_init);