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

 /*
  **************************************************************************
  * Copyright (c) 2019-2021, 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_vxlan.c
  *	NSS VxLAN driver interface APIs
  */
 #include "nss_core.h"
 #include "nss_vxlan.h"
 #include "nss_cmn.h"
 #include "nss_tx_rx_common.h"
 #include "nss_vxlan_log.h"
 #include "nss_vxlan_stats.h"

 #define NSS_VXLAN_TX_TIMEOUT 3000

 /*
  * Private data structure
  */
 static struct {
 	struct semaphore sem;		/* Semaphore structure. */
 	struct completion complete;	/* Completion structure. */
 	int response;			/* Response from FW. */
 	void *cb;			/* Original cb for msgs. */
 	void *app_data;			/* Original app_data for msgs. */
 } nss_vxlan_pvt;

 /*
  * nss_vxlan_verify_if_num()
  *	Verify if_num passed to us.
  */
 static bool nss_vxlan_verify_if_num(uint32_t if_num)
 {
 	uint32_t type;

 	if (if_num == NSS_VXLAN_INTERFACE) {
 		return true;
 	}

 	type = nss_dynamic_interface_get_type(nss_vxlan_get_ctx(), if_num);

 	return ((type == NSS_DYNAMIC_INTERFACE_TYPE_VXLAN_INNER) ||
 			(type == NSS_DYNAMIC_INTERFACE_TYPE_VXLAN_OUTER));
 }

 /*
  * nss_vxlan_callback()
  *	Callback to handle the completion of NSS->HLOS messages.
  */
 static void nss_vxlan_callback(void *app_data, struct nss_cmn_msg *msg)
 {
 	nss_vxlan_msg_callback_t callback = (nss_vxlan_msg_callback_t)nss_vxlan_pvt.cb;
 	void *data = nss_vxlan_pvt.app_data;

 	nss_vxlan_pvt.response = NSS_TX_SUCCESS;
 	nss_vxlan_pvt.cb = NULL;
 	nss_vxlan_pvt.app_data = NULL;

 	if (msg->response != NSS_CMN_RESPONSE_ACK) {
 		nss_warning("Vxlan Error response %d\n", msg->response);
 		nss_vxlan_pvt.response = NSS_TX_FAILURE;
 	}

 	if (callback) {
 		callback(data, msg);
 	}
 	complete(&nss_vxlan_pvt.complete);
 }

 /*
  * nss_vxlan_handler()
  *	Handle NSS -> HLOS messages for vxlan.
  */
 static void nss_vxlan_msg_handler(struct nss_ctx_instance *nss_ctx, struct nss_cmn_msg *ncm, __attribute__((unused))void *app_data)
 {
 	struct nss_vxlan_msg *nvm = (struct nss_vxlan_msg *)ncm;
 	nss_vxlan_msg_callback_t cb;

 	BUG_ON(!nss_vxlan_verify_if_num(ncm->interface));

 	/*
 	 * Is this a valid request/response packet?
 	 */
 	if (ncm->type >= NSS_VXLAN_MSG_TYPE_MAX) {
 		nss_warning("%px: received invalid message %d for vxlan interface", nss_ctx, ncm->type);
 		return;
 	}

 	if (nss_cmn_get_msg_len(ncm) > sizeof(struct nss_vxlan_msg)) {
 		nss_warning("%px: Length of message is greater than required: %d", nss_ctx, nss_cmn_get_msg_len(ncm));
 		return;
 	}

 	/*
 	 * Log messages.
 	 */
 	nss_core_log_msg_failures(nss_ctx, ncm);
 	nss_vxlan_log_rx_msg(nvm);

 	switch (nvm->cm.type) {
 	case NSS_VXLAN_MSG_TYPE_STATS_SYNC:
 		/*
 		 * Update common node statistics
 		 */
 		nss_vxlan_stats_sync(nss_ctx, nvm);
 	}

 	/*
 	 * Update the callback for NOTIFY messages
 	 */
 	if (ncm->response == NSS_CMN_RESPONSE_NOTIFY) {
 		ncm->cb = (nss_ptr_t)nss_core_get_msg_handler(nss_ctx, ncm->interface);
 	}

 	cb = (nss_vxlan_msg_callback_t)ncm->cb;

 	/*
 	 * Do we have a callback?
 	 */
 	if (!cb) {
 		nss_trace("%px: cb is null for interface %d\n", nss_ctx, ncm->interface);
 		return;
 	}

 	cb((void *)nss_ctx->subsys_dp_register[ncm->interface].ndev, ncm);
 }

 /*
  * nss_vxlan_tx_msg()
  *	Transmit a vxlan message to NSS FW. Don't call this from softirq/interrupts.
  */
 nss_tx_status_t nss_vxlan_tx_msg(struct nss_ctx_instance *nss_ctx, struct nss_vxlan_msg *nvm)
 {
 	struct nss_cmn_msg *ncm = &nvm->cm;

 	if (!nss_vxlan_verify_if_num(ncm->interface)) {
 		nss_warning("%px: wrong interface number %u\n", nss_ctx, nvm->cm.interface);
 		return NSS_TX_FAILURE_BAD_PARAM;
 	}

 	if (ncm->type >= NSS_VXLAN_MSG_TYPE_MAX) {
 		nss_warning("%px: wrong message type %u\n", nss_ctx, ncm->type);
 		return NSS_TX_FAILURE_BAD_PARAM;
 	}

 	/*
 	 * Trace messages.
 	 */
 	nss_vxlan_log_tx_msg(nvm);

 	return nss_core_send_cmd(nss_ctx, nvm, sizeof(*nvm), NSS_NBUF_PAYLOAD_SIZE);
 }
 EXPORT_SYMBOL(nss_vxlan_tx_msg);

 /*
  * nss_vxlan_tx_msg_sync()
  *	Transmit a vxlan message to NSS firmware synchronously.
  */
 nss_tx_status_t nss_vxlan_tx_msg_sync(struct nss_ctx_instance *nss_ctx, struct nss_vxlan_msg *nvm)
 {
 	nss_tx_status_t status;
 	int ret;

 	down(&nss_vxlan_pvt.sem);
 	nss_vxlan_pvt.cb = (void *)nvm->cm.cb;
 	nss_vxlan_pvt.app_data = (void *)nvm->cm.app_data;

 	nvm->cm.cb = (nss_ptr_t)nss_vxlan_callback;
 	nvm->cm.app_data = (nss_ptr_t)NULL;

 	status = nss_vxlan_tx_msg(nss_ctx, nvm);
 	if (status != NSS_TX_SUCCESS) {
 		nss_warning("%px: vxlan_tx_msg failed\n", nss_ctx);
 		up(&nss_vxlan_pvt.sem);
 		return status;
 	}

 	ret = wait_for_completion_timeout(&nss_vxlan_pvt.complete, msecs_to_jiffies(NSS_VXLAN_TX_TIMEOUT));
 	if (!ret) {
 		nss_warning("%px: vxlan tx sync failed due to timeout\n", nss_ctx);
 		nss_vxlan_pvt.response = NSS_TX_FAILURE;
 	}

 	status = nss_vxlan_pvt.response;
 	up(&nss_vxlan_pvt.sem);
 	return status;
 }
 EXPORT_SYMBOL(nss_vxlan_tx_msg_sync);

 /*
  * nss_vxlan_msg_init()
  *	Initialize VxLAN message.
  */
 void nss_vxlan_msg_init(struct nss_vxlan_msg *nvm, uint16_t if_num, uint32_t type, uint32_t len,
 				nss_vxlan_msg_callback_t cb, void *app_data)
 {
 	nss_cmn_msg_init(&nvm->cm, if_num, type, len, (void*)cb, app_data);
 }
 EXPORT_SYMBOL(nss_vxlan_msg_init);

 /*
  * nss_vxlan_unregister_if()
  *	Unregister a data packet notifier with NSS FW.
  */
 bool nss_vxlan_unregister_if(uint32_t if_num)
 {
 	struct nss_ctx_instance *nss_ctx;

 	nss_ctx = nss_vxlan_get_ctx();
 	if (!nss_vxlan_verify_if_num(if_num)) {
 		nss_warning("%px: data unregister received for invalid interface %d", nss_ctx, if_num);
 		return false;
 	}

 	nss_core_unregister_handler(nss_ctx, if_num);
 	nss_core_unregister_msg_handler(nss_ctx, if_num);
 	nss_core_unregister_subsys_dp(nss_ctx, if_num);
 	return true;
 }
 EXPORT_SYMBOL(nss_vxlan_unregister_if);

 /*
  * nss_vxlan_register_if()
  *	Registers a data packet notifier with NSS FW.
  */
 struct nss_ctx_instance *nss_vxlan_register_if(uint32_t if_num,
 						uint32_t type,
 						nss_vxlan_buf_callback_t data_cb,
 						nss_vxlan_msg_callback_t notify_cb,
 						struct net_device *netdev,
 						uint32_t features)
 {
 	struct nss_ctx_instance *nss_ctx;
 	int core_status;

 	nss_ctx = nss_vxlan_get_ctx();
 	if (!nss_vxlan_verify_if_num(if_num)) {
 		nss_warning("%px: data register received for invalid interface %d", nss_ctx, if_num);
 		return NULL;
 	}

 	core_status = nss_core_register_handler(nss_ctx, if_num, nss_vxlan_msg_handler, NULL);
 	if (core_status != NSS_CORE_STATUS_SUCCESS) {
 		nss_warning("%px: nss core register handler failed for if_num:%d with error :%d", nss_ctx, if_num, core_status);
 		return NULL;
 	}

 	core_status = nss_core_register_msg_handler(nss_ctx, if_num, notify_cb);
 	if (core_status != NSS_CORE_STATUS_SUCCESS) {
 		nss_core_unregister_handler(nss_ctx, if_num);
 		nss_warning("%px: nss core register handler failed for if_num:%d with error :%d", nss_ctx, if_num, core_status);
 		return NULL;
 	}

 	nss_core_register_subsys_dp(nss_ctx, if_num, data_cb, NULL, NULL, netdev, features);
 	nss_core_set_subsys_dp_type(nss_ctx, netdev, if_num, type);
 	return nss_ctx;
 }
 EXPORT_SYMBOL(nss_vxlan_register_if);

 /*
  * nss_vxlan_ifnum_with_core_id()
  *	Append core id to vxlan interface num.
  */
 int nss_vxlan_ifnum_with_core_id(int if_num)
 {
 	struct nss_ctx_instance *nss_ctx = nss_vxlan_get_ctx();

 	NSS_VERIFY_CTX_MAGIC(nss_ctx);

 	if (!nss_vxlan_verify_if_num(if_num)) {
 		nss_warning("%px: Invalid if_num: %d, must be a dynamic interface\n", nss_ctx, if_num);
 		return 0;
 	}
 	return NSS_INTERFACE_NUM_APPEND_COREID(nss_ctx, if_num);
 }
 EXPORT_SYMBOL(nss_vxlan_ifnum_with_core_id);

 /*
  * nss_vxlan_get_ctx()
  *	Return a VxLAN NSS context.
  */
 struct nss_ctx_instance *nss_vxlan_get_ctx()
 {
 	struct nss_ctx_instance *nss_ctx;

 	nss_ctx = &nss_top_main.nss[nss_top_main.vxlan_handler_id];
 	return nss_ctx;
 }
 EXPORT_SYMBOL(nss_vxlan_get_ctx);

 /*
  * nss_vxlan_init()
  *	Initializes Vxlan. Gets called from nss_init.c.
  */
 void nss_vxlan_init()
 {
 	uint32_t core_status;
 	struct nss_ctx_instance *nss_ctx = nss_vxlan_get_ctx();
 	if (!nss_ctx) {
 		nss_warning("%px: VxLAN is not registered", nss_ctx);
 		return;
 	}

 	nss_vxlan_stats_dentry_create();
 	sema_init(&nss_vxlan_pvt.sem, 1);
 	init_completion(&nss_vxlan_pvt.complete);
 	core_status = nss_core_register_handler(nss_ctx, NSS_VXLAN_INTERFACE, nss_vxlan_msg_handler, NULL);

 	if (core_status != NSS_CORE_STATUS_SUCCESS) {
 		nss_warning("%px: nss core register handler failed for if_num:%d with error :%d", nss_ctx, NSS_VXLAN_INTERFACE, core_status);
 	}

 }
	/*
	**************************************************************************
	* Copyright (c) 2019-2021, 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_vxlan.c
	* NSS VxLAN driver interface APIs
	*/
	#include "nss_core.h"
	#include "nss_vxlan.h"
	#include "nss_cmn.h"
	#include "nss_tx_rx_common.h"
	#include "nss_vxlan_log.h"
	#include "nss_vxlan_stats.h"

	#define NSS_VXLAN_TX_TIMEOUT 3000

	/*
	* Private data structure
	*/
	static struct {
	struct semaphore sem; /* Semaphore structure. */
	struct completion complete; /* Completion structure. */
	int response; /* Response from FW. */
	void cb; / Original cb for msgs. */
	void app_data; / Original app_data for msgs. */
	} nss_vxlan_pvt;

	/*
	* nss_vxlan_verify_if_num()
	* Verify if_num passed to us.
	*/
	static bool nss_vxlan_verify_if_num(uint32_t if_num)
	{
	uint32_t type;

	if (if_num == NSS_VXLAN_INTERFACE) {
	return true;
	}

	type = nss_dynamic_interface_get_type(nss_vxlan_get_ctx(), if_num);

	return ((type == NSS_DYNAMIC_INTERFACE_TYPE_VXLAN_INNER) \|\|
	(type == NSS_DYNAMIC_INTERFACE_TYPE_VXLAN_OUTER));
	}

	/*
	* nss_vxlan_callback()
	* Callback to handle the completion of NSS->HLOS messages.
	*/
	static void nss_vxlan_callback(void app_data, struct nss_cmn_msg msg)
	{
	nss_vxlan_msg_callback_t callback = (nss_vxlan_msg_callback_t)nss_vxlan_pvt.cb;
	void *data = nss_vxlan_pvt.app_data;

	nss_vxlan_pvt.response = NSS_TX_SUCCESS;
	nss_vxlan_pvt.cb = NULL;
	nss_vxlan_pvt.app_data = NULL;

	if (msg->response != NSS_CMN_RESPONSE_ACK) {
	nss_warning("Vxlan Error response %d\n", msg->response);
	nss_vxlan_pvt.response = NSS_TX_FAILURE;
	}

	if (callback) {
	callback(data, msg);
	}
	complete(&nss_vxlan_pvt.complete);
	}

	/*
	* nss_vxlan_handler()
	* Handle NSS -> HLOS messages for vxlan.
	*/
	static void nss_vxlan_msg_handler(struct nss_ctx_instance nss_ctx, struct nss_cmn_msg ncm, __attribute__((unused))void *app_data)
	{
	struct nss_vxlan_msg nvm = (struct nss_vxlan_msg )ncm;
	nss_vxlan_msg_callback_t cb;

	BUG_ON(!nss_vxlan_verify_if_num(ncm->interface));

	/*
	* Is this a valid request/response packet?
	*/
	if (ncm->type >= NSS_VXLAN_MSG_TYPE_MAX) {
	nss_warning("%px: received invalid message %d for vxlan interface", nss_ctx, ncm->type);
	return;
	}

	if (nss_cmn_get_msg_len(ncm) > sizeof(struct nss_vxlan_msg)) {
	nss_warning("%px: Length of message is greater than required: %d", nss_ctx, nss_cmn_get_msg_len(ncm));
	return;
	}

	/*
	* Log messages.
	*/
	nss_core_log_msg_failures(nss_ctx, ncm);
	nss_vxlan_log_rx_msg(nvm);

	switch (nvm->cm.type) {
	case NSS_VXLAN_MSG_TYPE_STATS_SYNC:
	/*
	* Update common node statistics
	*/
	nss_vxlan_stats_sync(nss_ctx, nvm);
	}

	/*
	* Update the callback for NOTIFY messages
	*/
	if (ncm->response == NSS_CMN_RESPONSE_NOTIFY) {
	ncm->cb = (nss_ptr_t)nss_core_get_msg_handler(nss_ctx, ncm->interface);
	}

	cb = (nss_vxlan_msg_callback_t)ncm->cb;

	/*
	* Do we have a callback?
	*/
	if (!cb) {
	nss_trace("%px: cb is null for interface %d\n", nss_ctx, ncm->interface);
	return;
	}

	cb((void *)nss_ctx->subsys_dp_register[ncm->interface].ndev, ncm);
	}

	/*
	* nss_vxlan_tx_msg()
	* Transmit a vxlan message to NSS FW. Don't call this from softirq/interrupts.
	*/
	nss_tx_status_t nss_vxlan_tx_msg(struct nss_ctx_instance nss_ctx, struct nss_vxlan_msg nvm)
	{
	struct nss_cmn_msg *ncm = &nvm->cm;

	if (!nss_vxlan_verify_if_num(ncm->interface)) {
	nss_warning("%px: wrong interface number %u\n", nss_ctx, nvm->cm.interface);
	return NSS_TX_FAILURE_BAD_PARAM;
	}

	if (ncm->type >= NSS_VXLAN_MSG_TYPE_MAX) {
	nss_warning("%px: wrong message type %u\n", nss_ctx, ncm->type);
	return NSS_TX_FAILURE_BAD_PARAM;
	}

	/*
	* Trace messages.
	*/
	nss_vxlan_log_tx_msg(nvm);

	return nss_core_send_cmd(nss_ctx, nvm, sizeof(*nvm), NSS_NBUF_PAYLOAD_SIZE);
	}
	EXPORT_SYMBOL(nss_vxlan_tx_msg);

	/*
	* nss_vxlan_tx_msg_sync()
	* Transmit a vxlan message to NSS firmware synchronously.
	*/
	nss_tx_status_t nss_vxlan_tx_msg_sync(struct nss_ctx_instance nss_ctx, struct nss_vxlan_msg nvm)
	{
	nss_tx_status_t status;
	int ret;

	down(&nss_vxlan_pvt.sem);
	nss_vxlan_pvt.cb = (void *)nvm->cm.cb;
	nss_vxlan_pvt.app_data = (void *)nvm->cm.app_data;

	nvm->cm.cb = (nss_ptr_t)nss_vxlan_callback;
	nvm->cm.app_data = (nss_ptr_t)NULL;

	status = nss_vxlan_tx_msg(nss_ctx, nvm);
	if (status != NSS_TX_SUCCESS) {
	nss_warning("%px: vxlan_tx_msg failed\n", nss_ctx);
	up(&nss_vxlan_pvt.sem);
	return status;
	}

	ret = wait_for_completion_timeout(&nss_vxlan_pvt.complete, msecs_to_jiffies(NSS_VXLAN_TX_TIMEOUT));
	if (!ret) {
	nss_warning("%px: vxlan tx sync failed due to timeout\n", nss_ctx);
	nss_vxlan_pvt.response = NSS_TX_FAILURE;
	}

	status = nss_vxlan_pvt.response;
	up(&nss_vxlan_pvt.sem);
	return status;
	}
	EXPORT_SYMBOL(nss_vxlan_tx_msg_sync);

	/*
	* nss_vxlan_msg_init()
	* Initialize VxLAN message.
	*/
	void nss_vxlan_msg_init(struct nss_vxlan_msg *nvm, uint16_t if_num, uint32_t type, uint32_t len,
	nss_vxlan_msg_callback_t cb, void *app_data)
	{
	nss_cmn_msg_init(&nvm->cm, if_num, type, len, (void*)cb, app_data);
	}
	EXPORT_SYMBOL(nss_vxlan_msg_init);

	/*
	* nss_vxlan_unregister_if()
	* Unregister a data packet notifier with NSS FW.
	*/
	bool nss_vxlan_unregister_if(uint32_t if_num)
	{
	struct nss_ctx_instance *nss_ctx;

	nss_ctx = nss_vxlan_get_ctx();
	if (!nss_vxlan_verify_if_num(if_num)) {
	nss_warning("%px: data unregister received for invalid interface %d", nss_ctx, if_num);
	return false;
	}

	nss_core_unregister_handler(nss_ctx, if_num);
	nss_core_unregister_msg_handler(nss_ctx, if_num);
	nss_core_unregister_subsys_dp(nss_ctx, if_num);
	return true;
	}
	EXPORT_SYMBOL(nss_vxlan_unregister_if);

	/*
	* nss_vxlan_register_if()
	* Registers a data packet notifier with NSS FW.
	*/
	struct nss_ctx_instance *nss_vxlan_register_if(uint32_t if_num,
	uint32_t type,
	nss_vxlan_buf_callback_t data_cb,
	nss_vxlan_msg_callback_t notify_cb,
	struct net_device *netdev,
	uint32_t features)
	{
	struct nss_ctx_instance *nss_ctx;
	int core_status;

	nss_ctx = nss_vxlan_get_ctx();
	if (!nss_vxlan_verify_if_num(if_num)) {
	nss_warning("%px: data register received for invalid interface %d", nss_ctx, if_num);
	return NULL;
	}

	core_status = nss_core_register_handler(nss_ctx, if_num, nss_vxlan_msg_handler, NULL);
	if (core_status != NSS_CORE_STATUS_SUCCESS) {
	nss_warning("%px: nss core register handler failed for if_num:%d with error :%d", nss_ctx, if_num, core_status);
	return NULL;
	}

	core_status = nss_core_register_msg_handler(nss_ctx, if_num, notify_cb);
	if (core_status != NSS_CORE_STATUS_SUCCESS) {
	nss_core_unregister_handler(nss_ctx, if_num);
	nss_warning("%px: nss core register handler failed for if_num:%d with error :%d", nss_ctx, if_num, core_status);
	return NULL;
	}

	nss_core_register_subsys_dp(nss_ctx, if_num, data_cb, NULL, NULL, netdev, features);
	nss_core_set_subsys_dp_type(nss_ctx, netdev, if_num, type);
	return nss_ctx;
	}
	EXPORT_SYMBOL(nss_vxlan_register_if);

	/*
	* nss_vxlan_ifnum_with_core_id()
	* Append core id to vxlan interface num.
	*/
	int nss_vxlan_ifnum_with_core_id(int if_num)
	{
	struct nss_ctx_instance *nss_ctx = nss_vxlan_get_ctx();

	NSS_VERIFY_CTX_MAGIC(nss_ctx);

	if (!nss_vxlan_verify_if_num(if_num)) {
	nss_warning("%px: Invalid if_num: %d, must be a dynamic interface\n", nss_ctx, if_num);
	return 0;
	}
	return NSS_INTERFACE_NUM_APPEND_COREID(nss_ctx, if_num);
	}
	EXPORT_SYMBOL(nss_vxlan_ifnum_with_core_id);

	/*
	* nss_vxlan_get_ctx()
	* Return a VxLAN NSS context.
	*/
	struct nss_ctx_instance *nss_vxlan_get_ctx()
	{
	struct nss_ctx_instance *nss_ctx;

	nss_ctx = &nss_top_main.nss[nss_top_main.vxlan_handler_id];
	return nss_ctx;
	}
	EXPORT_SYMBOL(nss_vxlan_get_ctx);

	/*
	* nss_vxlan_init()
	* Initializes Vxlan. Gets called from nss_init.c.
	*/
	void nss_vxlan_init()
	{
	uint32_t core_status;
	struct nss_ctx_instance *nss_ctx = nss_vxlan_get_ctx();
	if (!nss_ctx) {
	nss_warning("%px: VxLAN is not registered", nss_ctx);
	return;
	}

	nss_vxlan_stats_dentry_create();
	sema_init(&nss_vxlan_pvt.sem, 1);
	init_completion(&nss_vxlan_pvt.complete);
	core_status = nss_core_register_handler(nss_ctx, NSS_VXLAN_INTERFACE, nss_vxlan_msg_handler, NULL);

	if (core_status != NSS_CORE_STATUS_SUCCESS) {
	nss_warning("%px: nss core register handler failed for if_num:%d with error :%d", nss_ctx, NSS_VXLAN_INTERFACE, core_status);
	}

	}