qca-nss-drv/nss_gre_stats.c - manifest_repos/sdk - Git at Google

 /*
  **************************************************************************
  * Copyright (c) 2017-2021, The Linux Foundation. All rights reserved.
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
  * above copyright notice and this permission notice appear in all copies.
  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  **************************************************************************
  */

 /*
  * nss_gre_stats.c
  *	NSS GRE statistics APIs
  *
  */

 #include "nss_tx_rx_common.h"
 #include "nss_gre.h"
 #include "nss_gre_stats.h"
 #include "nss_gre_strings.h"

 /*
  * Declare atomic notifier data structure for statistics.
  */
 ATOMIC_NOTIFIER_HEAD(nss_gre_stats_notifier);

 /*
  * Data structures to store GRE nss debug stats
  */
 static DEFINE_SPINLOCK(nss_gre_stats_lock);
 static struct nss_gre_stats_session session_stats[NSS_GRE_MAX_DEBUG_SESSION_STATS];
 static struct nss_gre_stats_base base_stats;

 /*
  * GRE statistics APIs
  */

 /*
  * nss_gre_stats_session_unregister()
  *	Unregister debug statistic for GRE session.
  */
 void nss_gre_stats_session_unregister(uint32_t if_num)
 {
 	int i;

 	spin_lock_bh(&nss_gre_stats_lock);
 	for (i = 0; i < NSS_GRE_MAX_DEBUG_SESSION_STATS; i++) {
 		if (session_stats[i].if_num == if_num) {
 			memset(&session_stats[i], 0, sizeof(struct nss_gre_stats_session));
 			break;
 		}
 	}
 	spin_unlock_bh(&nss_gre_stats_lock);
 }

 /*
  * nss_gre_stats_session_register()
  *	Register debug statistic for GRE session.
  */
 void nss_gre_stats_session_register(uint32_t if_num, struct net_device *netdev)
 {
 	int i;

 	spin_lock_bh(&nss_gre_stats_lock);
 	for (i = 0; i < NSS_GRE_MAX_DEBUG_SESSION_STATS; i++) {
 		if (!session_stats[i].valid) {
 			session_stats[i].valid = true;
 			session_stats[i].if_num = if_num;
 			session_stats[i].if_index = netdev->ifindex;
 			break;
 		}
 	}
 	spin_unlock_bh(&nss_gre_stats_lock);
 }

 /*
  * nss_gre_stats_session_sync()
  *	debug statistics sync for GRE session.
  */
 void nss_gre_stats_session_sync(struct nss_ctx_instance *nss_ctx, struct nss_gre_session_stats_msg *sstats, uint16_t if_num)
 {
 	int i, j;
 	enum nss_dynamic_interface_type interface_type = nss_dynamic_interface_get_type(nss_ctx, if_num);

 	spin_lock_bh(&nss_gre_stats_lock);
 	for (i = 0; i < NSS_GRE_MAX_DEBUG_SESSION_STATS; i++) {
 		if (session_stats[i].if_num == if_num) {
 			for (j = 0; j < NSS_GRE_SESSION_DEBUG_MAX; j++) {
 				session_stats[i].stats[j] += sstats->stats[j];
 			}

 			if (interface_type == NSS_DYNAMIC_INTERFACE_TYPE_GRE_INNER) {
 				session_stats[i].stats[NSS_GRE_SESSION_ENCAP_RX_RECEIVED] += sstats->node_stats.rx_packets;
 			} else if (interface_type == NSS_DYNAMIC_INTERFACE_TYPE_GRE_OUTER) {
 				session_stats[i].stats[NSS_GRE_SESSION_DECAP_TX_FORWARDED] += sstats->node_stats.tx_packets;
 			}
 			break;
 		}
 	}
 	spin_unlock_bh(&nss_gre_stats_lock);
 }

 /*
  * nss_gre_stats_base_sync()
  *	Debug statistics sync for GRE base node.
  */
 void nss_gre_stats_base_sync(struct nss_ctx_instance *nss_ctx, struct nss_gre_base_stats_msg *bstats)
 {
 	int i;

 	spin_lock_bh(&nss_gre_stats_lock);
 	for (i = 0; i < NSS_GRE_BASE_DEBUG_MAX; i++) {
 		base_stats.stats[i] += bstats->stats[i];
 	}
 	spin_unlock_bh(&nss_gre_stats_lock);
 }

 /*
  * nss_gre_stats_session_get()
  *	Get GRE session debug statistics.
  */
 static void nss_gre_stats_session_get(void *stats_mem, int size)
 {
 	struct nss_gre_stats_session *stats = (struct nss_gre_stats_session *)stats_mem;
 	int i;

 	if (!stats || (size < (sizeof(struct nss_gre_stats_session) * NSS_GRE_MAX_DEBUG_SESSION_STATS)))  {
 		nss_warning("No memory to copy gre stats");
 		return;
 	}

 	spin_lock_bh(&nss_gre_stats_lock);
 	for (i = 0; i < NSS_GRE_MAX_DEBUG_SESSION_STATS; i++) {
 		if (session_stats[i].valid) {
 			memcpy(stats, &session_stats[i], sizeof(struct nss_gre_stats_session));
 			stats++;
 		}
 	}
 	spin_unlock_bh(&nss_gre_stats_lock);
 }

 /*
  * nss_gre_stats_base_get()
  *	Get GRE debug base statistics.
  */
 static void nss_gre_stats_base_get(void *stats_mem, int size)
 {
 	struct nss_gre_stats_base *stats = (struct nss_gre_stats_base *)stats_mem;

 	if (!stats) {
 		nss_warning("No memory to copy GRE base stats\n");
 		return;
 	}

 	if (size < sizeof(struct nss_gre_stats_base)) {
 		nss_warning("Not enough memory to copy GRE base stats\n");
 		return;
 	}

 	spin_lock_bh(&nss_gre_stats_lock);
 	memcpy(stats, &base_stats, sizeof(struct nss_gre_stats_base));
 	spin_unlock_bh(&nss_gre_stats_lock);
 }

 /*
  * nss_gre_stats_read()
  *	Read GRE statistics
  */
 static ssize_t nss_gre_stats_read(struct file *fp, char __user *ubuf, size_t sz, loff_t *ppos)
 {
 	uint32_t max_output_lines = 2 /* header & footer for base debug stats */
 		+ 2 /* header & footer for session debug stats */
 		+ NSS_GRE_BASE_DEBUG_MAX  /* Base debug */
 		+ NSS_GRE_MAX_DEBUG_SESSION_STATS * (NSS_GRE_SESSION_DEBUG_MAX + 2) /*session stats */
 		+ 2;
 	size_t size_al = NSS_STATS_MAX_STR_LENGTH * max_output_lines;
 	size_t size_wr = 0;
 	ssize_t bytes_read = 0;
 	struct net_device *dev;
 	struct nss_gre_stats_session *sstats;
 	struct nss_gre_stats_base *bstats;
 	int id;

 	char *lbuf = kzalloc(size_al, GFP_KERNEL);
 	if (unlikely(!lbuf)) {
 		nss_warning("Could not allocate memory for local statistics buffer");
 		return 0;
 	}

 	bstats = kzalloc(sizeof(struct nss_gre_stats_base), GFP_KERNEL);
 	if (unlikely(!bstats)) {
 		nss_warning("Could not allocate memory for base debug statistics buffer");
 		kfree(lbuf);
 		return 0;
 	}

 	sstats = kzalloc(sizeof(struct nss_gre_stats_session) * NSS_GRE_MAX_DEBUG_SESSION_STATS, GFP_KERNEL);
 	if (unlikely(!sstats)) {
 		nss_warning("Could not allocate memory for base debug statistics buffer");
 		kfree(lbuf);
 		kfree(bstats);
 		return 0;
 	}

 	size_wr += nss_stats_banner(lbuf, size_wr, size_al, "gre", NSS_STATS_SINGLE_CORE);

 	/*
 	 * Get all base stats
 	 */
 	nss_gre_stats_base_get((void *)bstats, sizeof(struct nss_gre_stats_base));

 	size_wr += nss_stats_print("gre", NULL, NSS_STATS_SINGLE_INSTANCE
 					, nss_gre_strings_base_stats
 					, bstats->stats
 					, NSS_GRE_BASE_DEBUG_MAX
 					, lbuf, size_wr, size_al);

 	/*
 	 * Get all session stats
 	 */
 	nss_gre_stats_session_get(sstats, sizeof(struct nss_gre_stats_session) * NSS_GRE_MAX_DEBUG_SESSION_STATS);

 	for (id = 0; id < NSS_GRE_MAX_DEBUG_SESSION_STATS; id++) {

 		if (!((sstats + id)->valid)) {
 			continue;
 		}

 		dev = dev_get_by_index(&init_net, (sstats + id)->if_index);
 		if (likely(dev)) {

 			size_wr += scnprintf(lbuf + size_wr, size_al - size_wr, "%d. nss interface id=%d, netdevice=%s\n", id,
 					     (sstats + id)->if_num, dev->name);
 			dev_put(dev);
 		} else {
 			size_wr += scnprintf(lbuf + size_wr, size_al - size_wr, "%d. nss interface id=%d\n", id,
 					     (sstats + id)->if_num);
 		}
 		size_wr += nss_stats_print("gre_session", NULL, id
 						, nss_gre_strings_session_stats
 						, (sstats + id)->stats
 						, NSS_GRE_SESSION_DEBUG_MAX
 						, lbuf, size_wr, size_al);
 		size_wr += scnprintf(lbuf + size_wr, size_al - size_wr, "\n");
 	}

 	bytes_read = simple_read_from_buffer(ubuf, sz, ppos, lbuf, size_wr);

 	kfree(sstats);
 	kfree(bstats);
 	kfree(lbuf);
 	return bytes_read;
 }

 /*
  * nss_gre_stats_ops
  */
 NSS_STATS_DECLARE_FILE_OPERATIONS(gre)

 /*
  * nss_gre_stats_dentry_create()
  *	Create gre statistics debug entry.
  */
 void nss_gre_stats_dentry_create(void)
 {
 	nss_stats_create_dentry("gre", &nss_gre_stats_ops);
 }

 /*
  * nss_gre_stats_base_notify()
  *	Sends notifications to all the registered modules.
  *
  * Leverage NSS-FW statistics timing to update Netlink.
  */
 void nss_gre_stats_base_notify(struct nss_ctx_instance *nss_ctx)
 {
 	struct nss_gre_base_stats_notification gre_stats;

 	spin_lock_bh(&nss_gre_stats_lock);
 	gre_stats.core_id = nss_ctx->id;
 	memcpy(gre_stats.stats_base_ctx, base_stats.stats, sizeof(gre_stats.stats_base_ctx));
 	spin_unlock_bh(&nss_gre_stats_lock);

 	atomic_notifier_call_chain(&nss_gre_stats_notifier, NSS_STATS_EVENT_NOTIFY, &gre_stats);
 }

 /*
  * nss_gre_stats_session_notify()
  *	Sends notifications to all the registered modules.
  *
  * Leverage NSS-FW statistics timing to update Netlink.
  */
 void nss_gre_stats_session_notify(struct nss_ctx_instance *nss_ctx, uint32_t if_num)
 {
 	struct nss_gre_session_stats_notification gre_stats;
 	int i;

 	spin_lock_bh(&nss_gre_stats_lock);
 	for (i = 0; i < NSS_GRE_MAX_DEBUG_SESSION_STATS; i++) {
 		if (session_stats[i].if_num != if_num) {
 			continue;
 		}

 		memcpy(gre_stats.stats_session_ctx, session_stats[i].stats, sizeof(gre_stats.stats_session_ctx));
 		gre_stats.core_id = nss_ctx->id;
 		gre_stats.if_num = if_num;
 		spin_unlock_bh(&nss_gre_stats_lock);
 		atomic_notifier_call_chain(&nss_gre_stats_notifier, NSS_STATS_EVENT_NOTIFY, &gre_stats);
 		return;
 	}
 	spin_unlock_bh(&nss_gre_stats_lock);
 }

 /*
  * nss_gre_stats_unregister_notifier()
  *	Deregisters statistics notifier.
  */
 int nss_gre_stats_unregister_notifier(struct notifier_block *nb)
 {
 	return atomic_notifier_chain_unregister(&nss_gre_stats_notifier, nb);
 }
 EXPORT_SYMBOL(nss_gre_stats_unregister_notifier);

 /*
  * nss_gre_stats_register_notifier()
  *	Registers statistics notifier.
  */
 int nss_gre_stats_register_notifier(struct notifier_block *nb)
 {
 	return atomic_notifier_chain_register(&nss_gre_stats_notifier, nb);
 }
 EXPORT_SYMBOL(nss_gre_stats_register_notifier);
	/*
	**************************************************************************
	* Copyright (c) 2017-2021, The Linux Foundation. All rights reserved.
	* Permission to use, copy, modify, and/or distribute this software for
	* any purpose with or without fee is hereby granted, provided that the
	* above copyright notice and this permission notice appear in all copies.
	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
	* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	**************************************************************************
	*/

	/*
	* nss_gre_stats.c
	* NSS GRE statistics APIs
	*
	*/

	#include "nss_tx_rx_common.h"
	#include "nss_gre.h"
	#include "nss_gre_stats.h"
	#include "nss_gre_strings.h"

	/*
	* Declare atomic notifier data structure for statistics.
	*/
	ATOMIC_NOTIFIER_HEAD(nss_gre_stats_notifier);

	/*
	* Data structures to store GRE nss debug stats
	*/
	static DEFINE_SPINLOCK(nss_gre_stats_lock);
	static struct nss_gre_stats_session session_stats[NSS_GRE_MAX_DEBUG_SESSION_STATS];
	static struct nss_gre_stats_base base_stats;

	/*
	* GRE statistics APIs
	*/

	/*
	* nss_gre_stats_session_unregister()
	* Unregister debug statistic for GRE session.
	*/
	void nss_gre_stats_session_unregister(uint32_t if_num)
	{
	int i;

	spin_lock_bh(&nss_gre_stats_lock);
	for (i = 0; i < NSS_GRE_MAX_DEBUG_SESSION_STATS; i++) {
	if (session_stats[i].if_num == if_num) {
	memset(&session_stats[i], 0, sizeof(struct nss_gre_stats_session));
	break;
	}
	}
	spin_unlock_bh(&nss_gre_stats_lock);
	}

	/*
	* nss_gre_stats_session_register()
	* Register debug statistic for GRE session.
	*/
	void nss_gre_stats_session_register(uint32_t if_num, struct net_device *netdev)
	{
	int i;

	spin_lock_bh(&nss_gre_stats_lock);
	for (i = 0; i < NSS_GRE_MAX_DEBUG_SESSION_STATS; i++) {
	if (!session_stats[i].valid) {
	session_stats[i].valid = true;
	session_stats[i].if_num = if_num;
	session_stats[i].if_index = netdev->ifindex;
	break;
	}
	}
	spin_unlock_bh(&nss_gre_stats_lock);
	}

	/*
	* nss_gre_stats_session_sync()
	* debug statistics sync for GRE session.
	*/
	void nss_gre_stats_session_sync(struct nss_ctx_instance nss_ctx, struct nss_gre_session_stats_msg sstats, uint16_t if_num)
	{
	int i, j;
	enum nss_dynamic_interface_type interface_type = nss_dynamic_interface_get_type(nss_ctx, if_num);

	spin_lock_bh(&nss_gre_stats_lock);
	for (i = 0; i < NSS_GRE_MAX_DEBUG_SESSION_STATS; i++) {
	if (session_stats[i].if_num == if_num) {
	for (j = 0; j < NSS_GRE_SESSION_DEBUG_MAX; j++) {
	session_stats[i].stats[j] += sstats->stats[j];
	}

	if (interface_type == NSS_DYNAMIC_INTERFACE_TYPE_GRE_INNER) {
	session_stats[i].stats[NSS_GRE_SESSION_ENCAP_RX_RECEIVED] += sstats->node_stats.rx_packets;
	} else if (interface_type == NSS_DYNAMIC_INTERFACE_TYPE_GRE_OUTER) {
	session_stats[i].stats[NSS_GRE_SESSION_DECAP_TX_FORWARDED] += sstats->node_stats.tx_packets;
	}
	break;
	}
	}
	spin_unlock_bh(&nss_gre_stats_lock);
	}

	/*
	* nss_gre_stats_base_sync()
	* Debug statistics sync for GRE base node.
	*/
	void nss_gre_stats_base_sync(struct nss_ctx_instance nss_ctx, struct nss_gre_base_stats_msg bstats)
	{
	int i;

	spin_lock_bh(&nss_gre_stats_lock);
	for (i = 0; i < NSS_GRE_BASE_DEBUG_MAX; i++) {
	base_stats.stats[i] += bstats->stats[i];
	}
	spin_unlock_bh(&nss_gre_stats_lock);
	}

	/*
	* nss_gre_stats_session_get()
	* Get GRE session debug statistics.
	*/
	static void nss_gre_stats_session_get(void *stats_mem, int size)
	{
	struct nss_gre_stats_session stats = (struct nss_gre_stats_session )stats_mem;
	int i;

	if (!stats \|\| (size < (sizeof(struct nss_gre_stats_session) * NSS_GRE_MAX_DEBUG_SESSION_STATS))) {
	nss_warning("No memory to copy gre stats");
	return;
	}

	spin_lock_bh(&nss_gre_stats_lock);
	for (i = 0; i < NSS_GRE_MAX_DEBUG_SESSION_STATS; i++) {
	if (session_stats[i].valid) {
	memcpy(stats, &session_stats[i], sizeof(struct nss_gre_stats_session));
	stats++;
	}
	}
	spin_unlock_bh(&nss_gre_stats_lock);
	}

	/*
	* nss_gre_stats_base_get()
	* Get GRE debug base statistics.
	*/
	static void nss_gre_stats_base_get(void *stats_mem, int size)
	{
	struct nss_gre_stats_base stats = (struct nss_gre_stats_base )stats_mem;

	if (!stats) {
	nss_warning("No memory to copy GRE base stats\n");
	return;
	}

	if (size < sizeof(struct nss_gre_stats_base)) {
	nss_warning("Not enough memory to copy GRE base stats\n");
	return;
	}

	spin_lock_bh(&nss_gre_stats_lock);
	memcpy(stats, &base_stats, sizeof(struct nss_gre_stats_base));
	spin_unlock_bh(&nss_gre_stats_lock);
	}

	/*
	* nss_gre_stats_read()
	* Read GRE statistics
	*/
	static ssize_t nss_gre_stats_read(struct file fp, char __user ubuf, size_t sz, loff_t *ppos)
	{
	uint32_t max_output_lines = 2 /* header & footer for base debug stats */
	+ 2 /* header & footer for session debug stats */
	+ NSS_GRE_BASE_DEBUG_MAX /* Base debug */
	+ NSS_GRE_MAX_DEBUG_SESSION_STATS * (NSS_GRE_SESSION_DEBUG_MAX + 2) /session stats /
	+ 2;
	size_t size_al = NSS_STATS_MAX_STR_LENGTH * max_output_lines;
	size_t size_wr = 0;
	ssize_t bytes_read = 0;
	struct net_device *dev;
	struct nss_gre_stats_session *sstats;
	struct nss_gre_stats_base *bstats;
	int id;

	char *lbuf = kzalloc(size_al, GFP_KERNEL);
	if (unlikely(!lbuf)) {
	nss_warning("Could not allocate memory for local statistics buffer");
	return 0;
	}

	bstats = kzalloc(sizeof(struct nss_gre_stats_base), GFP_KERNEL);
	if (unlikely(!bstats)) {
	nss_warning("Could not allocate memory for base debug statistics buffer");
	kfree(lbuf);
	return 0;
	}

	sstats = kzalloc(sizeof(struct nss_gre_stats_session) * NSS_GRE_MAX_DEBUG_SESSION_STATS, GFP_KERNEL);
	if (unlikely(!sstats)) {
	nss_warning("Could not allocate memory for base debug statistics buffer");
	kfree(lbuf);
	kfree(bstats);
	return 0;
	}

	size_wr += nss_stats_banner(lbuf, size_wr, size_al, "gre", NSS_STATS_SINGLE_CORE);

	/*
	* Get all base stats
	*/
	nss_gre_stats_base_get((void *)bstats, sizeof(struct nss_gre_stats_base));

	size_wr += nss_stats_print("gre", NULL, NSS_STATS_SINGLE_INSTANCE
	, nss_gre_strings_base_stats
	, bstats->stats
	, NSS_GRE_BASE_DEBUG_MAX
	, lbuf, size_wr, size_al);

	/*
	* Get all session stats
	*/
	nss_gre_stats_session_get(sstats, sizeof(struct nss_gre_stats_session) * NSS_GRE_MAX_DEBUG_SESSION_STATS);

	for (id = 0; id < NSS_GRE_MAX_DEBUG_SESSION_STATS; id++) {

	if (!((sstats + id)->valid)) {
	continue;
	}

	dev = dev_get_by_index(&init_net, (sstats + id)->if_index);
	if (likely(dev)) {

	size_wr += scnprintf(lbuf + size_wr, size_al - size_wr, "%d. nss interface id=%d, netdevice=%s\n", id,
	(sstats + id)->if_num, dev->name);
	dev_put(dev);
	} else {
	size_wr += scnprintf(lbuf + size_wr, size_al - size_wr, "%d. nss interface id=%d\n", id,
	(sstats + id)->if_num);
	}
	size_wr += nss_stats_print("gre_session", NULL, id
	, nss_gre_strings_session_stats
	, (sstats + id)->stats
	, NSS_GRE_SESSION_DEBUG_MAX
	, lbuf, size_wr, size_al);
	size_wr += scnprintf(lbuf + size_wr, size_al - size_wr, "\n");
	}

	bytes_read = simple_read_from_buffer(ubuf, sz, ppos, lbuf, size_wr);

	kfree(sstats);
	kfree(bstats);
	kfree(lbuf);
	return bytes_read;
	}

	/*
	* nss_gre_stats_ops
	*/
	NSS_STATS_DECLARE_FILE_OPERATIONS(gre)

	/*
	* nss_gre_stats_dentry_create()
	* Create gre statistics debug entry.
	*/
	void nss_gre_stats_dentry_create(void)
	{
	nss_stats_create_dentry("gre", &nss_gre_stats_ops);
	}

	/*
	* nss_gre_stats_base_notify()
	* Sends notifications to all the registered modules.
	*
	* Leverage NSS-FW statistics timing to update Netlink.
	*/
	void nss_gre_stats_base_notify(struct nss_ctx_instance *nss_ctx)
	{
	struct nss_gre_base_stats_notification gre_stats;

	spin_lock_bh(&nss_gre_stats_lock);
	gre_stats.core_id = nss_ctx->id;
	memcpy(gre_stats.stats_base_ctx, base_stats.stats, sizeof(gre_stats.stats_base_ctx));
	spin_unlock_bh(&nss_gre_stats_lock);

	atomic_notifier_call_chain(&nss_gre_stats_notifier, NSS_STATS_EVENT_NOTIFY, &gre_stats);
	}

	/*
	* nss_gre_stats_session_notify()
	* Sends notifications to all the registered modules.
	*
	* Leverage NSS-FW statistics timing to update Netlink.
	*/
	void nss_gre_stats_session_notify(struct nss_ctx_instance *nss_ctx, uint32_t if_num)
	{
	struct nss_gre_session_stats_notification gre_stats;
	int i;

	spin_lock_bh(&nss_gre_stats_lock);
	for (i = 0; i < NSS_GRE_MAX_DEBUG_SESSION_STATS; i++) {
	if (session_stats[i].if_num != if_num) {
	continue;
	}

	memcpy(gre_stats.stats_session_ctx, session_stats[i].stats, sizeof(gre_stats.stats_session_ctx));
	gre_stats.core_id = nss_ctx->id;
	gre_stats.if_num = if_num;
	spin_unlock_bh(&nss_gre_stats_lock);
	atomic_notifier_call_chain(&nss_gre_stats_notifier, NSS_STATS_EVENT_NOTIFY, &gre_stats);
	return;
	}
	spin_unlock_bh(&nss_gre_stats_lock);
	}

	/*
	* nss_gre_stats_unregister_notifier()
	* Deregisters statistics notifier.
	*/
	int nss_gre_stats_unregister_notifier(struct notifier_block *nb)
	{
	return atomic_notifier_chain_unregister(&nss_gre_stats_notifier, nb);
	}
	EXPORT_SYMBOL(nss_gre_stats_unregister_notifier);

	/*
	* nss_gre_stats_register_notifier()
	* Registers statistics notifier.
	*/
	int nss_gre_stats_register_notifier(struct notifier_block *nb)
	{
	return atomic_notifier_chain_register(&nss_gre_stats_notifier, nb);
	}
	EXPORT_SYMBOL(nss_gre_stats_register_notifier);