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

 /*
  **************************************************************************
  * Copyright (c) 2016-2018, 2020-2021, 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.
  **************************************************************************
  */

 #include "nss_ppe.h"
 #include "nss_ppe_stats.h"
 #include "nss_ppe_strings.h"

 DEFINE_SPINLOCK(nss_ppe_stats_lock);

 struct nss_ppe_stats_debug nss_ppe_debug_stats;
 struct nss_ppe_pvt ppe_pvt;

 /*
  * nss_ppe_verify_ifnum()
  *	Verify PPE interface number.
  */
 static inline bool nss_ppe_verify_ifnum(int if_num)
 {
 	return nss_is_dynamic_interface(if_num) || (if_num == NSS_PPE_INTERFACE);
 }

 /*
  * nss_ppe_callback()
  *	Callback to handle the completion of NSS->HLOS messages.
  */
 static void nss_ppe_callback(void *app_data, struct nss_ppe_msg *npm)
 {
 	nss_ppe_msg_callback_t callback = (nss_ppe_msg_callback_t)ppe_pvt.cb;
 	void *data = ppe_pvt.app_data;

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

 	if (npm->cm.response != NSS_CMN_RESPONSE_ACK) {
 		nss_warning("ppe error response %d\n", npm->cm.response);
 		ppe_pvt.response = npm->cm.response;
 	}

 	if (callback) {
 		callback(data, npm);
 	}
 	complete(&ppe_pvt.complete);
 }

 /*
  * nss_ppe_tx_msg()
  *	Transmit a ppe message to NSSFW
  */
 nss_tx_status_t nss_ppe_tx_msg(struct nss_ctx_instance *nss_ctx, struct nss_ppe_msg *msg)
 {
 	struct nss_cmn_msg *ncm = &msg->cm;

 	/*
 	 * Trace messages.
 	 */
 	nss_ppe_log_tx_msg(msg);

 	/*
 	 * Sanity check the message
 	 */
 	if (ncm->type >= NSS_PPE_MSG_MAX) {
 		nss_warning("%px: message type out of range: %d\n", nss_ctx, ncm->type);
 		return NSS_TX_FAILURE;
 	}

 	if (!nss_ppe_verify_ifnum(ncm->interface)) {
 		nss_warning("%px: invalid interface %d\n", nss_ctx, ncm->interface);
 		return NSS_TX_FAILURE;
 	}

 	return nss_core_send_cmd(nss_ctx, msg, sizeof(*msg), NSS_NBUF_PAYLOAD_SIZE);
 }

 /*
  * nss_ppe_tx_msg_sync()
  *	Transmit a ppe message to NSS firmware synchronously.
  */
 nss_tx_status_t nss_ppe_tx_msg_sync(struct nss_ctx_instance *nss_ctx, struct nss_ppe_msg *npm)
 {
 	nss_tx_status_t status;
 	int ret = 0;

 	down(&ppe_pvt.sem);
 	ppe_pvt.cb = (void *)npm->cm.cb;
 	ppe_pvt.app_data = (void *)npm->cm.app_data;

 	npm->cm.cb = (nss_ptr_t)nss_ppe_callback;
 	npm->cm.app_data = (nss_ptr_t)NULL;

 	status = nss_ppe_tx_msg(nss_ctx, npm);
 	if (status != NSS_TX_SUCCESS) {
 		nss_warning("%px: ppe_tx_msg failed\n", nss_ctx);
 		up(&ppe_pvt.sem);
 		return status;
 	}

 	ret = wait_for_completion_timeout(&ppe_pvt.complete, msecs_to_jiffies(NSS_PPE_TX_TIMEOUT));
 	if (!ret) {
 		nss_warning("%px: ppe msg tx failed due to timeout\n", nss_ctx);
 		ppe_pvt.response = NSS_TX_FAILURE;
 	}

 	status = ppe_pvt.response;
 	up(&ppe_pvt.sem);
 	return status;
 }

 /*
  * nss_ppe_get_context()
  *	Get NSS context instance for ppe
  */
 struct nss_ctx_instance *nss_ppe_get_context(void)
 {
 	return (struct nss_ctx_instance *)&nss_top_main.nss[nss_top_main.ppe_handler_id];
 }

 /*
  * nss_ppe_msg_init()
  *	Initialize nss_ppe_msg.
  */
 void nss_ppe_msg_init(struct nss_ppe_msg *ncm, uint16_t if_num, uint32_t type, uint32_t len, void *cb, void *app_data)
 {
 	nss_cmn_msg_init(&ncm->cm, if_num, type, len, cb, app_data);
 }

 /*
  * nss_ppe_tx_ipsec_config_msg
  *	API to send inline IPsec port configure message to NSS FW
  */
 nss_tx_status_t nss_ppe_tx_ipsec_config_msg(uint32_t nss_ifnum, uint32_t vsi_num, uint16_t mtu,
 						__attribute__((unused))uint16_t mru)
 {
 	struct nss_ctx_instance *nss_ctx = nss_ppe_get_context();
 	struct nss_ppe_msg npm = {0};

 	if (!nss_ctx) {
 		nss_warning("Can't get nss context\n");
 		return NSS_TX_FAILURE;
 	}

 	if (vsi_num >= NSS_PPE_VSI_NUM_MAX) {
 		nss_warning("Invalid vsi number:%u\n", vsi_num);
 		return NSS_TX_FAILURE;
 	}

 	nss_ppe_msg_init(&npm, NSS_PPE_INTERFACE, NSS_PPE_MSG_IPSEC_PORT_CONFIG,
 			sizeof(struct nss_ppe_ipsec_port_config_msg), NULL, NULL);

 	npm.msg.ipsec_config.nss_ifnum = nss_ifnum;
 	npm.msg.ipsec_config.vsi_num = vsi_num;
 	npm.msg.ipsec_config.mtu = mtu;

 	return nss_ppe_tx_msg_sync(nss_ctx, &npm);
 }

 /*
  * nss_ppe_tx_ipsec_mtu_msg
  *	API to send IPsec port MTU change message to NSS FW
  */
 nss_tx_status_t nss_ppe_tx_ipsec_mtu_msg(uint32_t nss_ifnum, uint16_t mtu, __attribute__((unused))uint16_t mru)
 {
 	struct nss_ctx_instance *nss_ctx = nss_ppe_get_context();
 	struct nss_ppe_msg npm = {0};

 	if (!nss_ctx) {
 		nss_warning("Can't get nss context\n");
 		return NSS_TX_FAILURE;
 	}

 	nss_ppe_msg_init(&npm, NSS_PPE_INTERFACE, NSS_PPE_MSG_IPSEC_PORT_MTU_CHANGE,
 			sizeof(struct nss_ppe_ipsec_port_mtu_msg), NULL, NULL);

 	npm.msg.ipsec_mtu.nss_ifnum = nss_ifnum;
 	npm.msg.ipsec_mtu.mtu = mtu;

 	return nss_ppe_tx_msg_sync(nss_ctx, &npm);
 }

 /*
  * nss_ppe_tx_ipsec_add_intf_msg
  *	API to attach NSS interface to IPsec port
  */
 nss_tx_status_t nss_ppe_tx_ipsec_add_intf_msg(uint32_t nss_ifnum)
 {
 	struct nss_ctx_instance *nss_ctx = nss_ppe_get_context();
 	struct nss_ppe_msg npm = {0};

 	if (!nss_ctx) {
 		nss_warning("Can't get nss context\n");
 		return NSS_TX_FAILURE;
 	}

 	nss_ppe_msg_init(&npm, NSS_PPE_INTERFACE, NSS_PPE_MSG_IPSEC_ADD_INTF,
 			sizeof(struct nss_ppe_ipsec_add_intf_msg), NULL, NULL);

 	npm.msg.ipsec_addif.nss_ifnum = nss_ifnum;

 	return nss_ppe_tx_msg_sync(nss_ctx, &npm);
 }

 /*
  * nss_ppe_tx_ipsec_del_intf_msg
  *	API to detach NSS interface to IPsec port
  */
 nss_tx_status_t nss_ppe_tx_ipsec_del_intf_msg(uint32_t nss_ifnum)
 {
 	struct nss_ctx_instance *nss_ctx = nss_ppe_get_context();
 	struct nss_ppe_msg npm = {0};

 	if (!nss_ctx) {
 		nss_warning("Can't get nss context\n");
 		return NSS_TX_FAILURE;
 	}

 	nss_ppe_msg_init(&npm, NSS_PPE_INTERFACE, NSS_PPE_MSG_IPSEC_DEL_INTF,
 			sizeof(struct nss_ppe_ipsec_del_intf_msg), NULL, NULL);

 	npm.msg.ipsec_delif.nss_ifnum = nss_ifnum;

 	return nss_ppe_tx_msg_sync(nss_ctx, &npm);
 }

 /*
  * nss_ppe_handler()
  *	Handle NSS -> HLOS messages for ppe
  */
 static void nss_ppe_handler(struct nss_ctx_instance *nss_ctx, struct nss_cmn_msg *ncm, __attribute__((unused))void *app_data)
 {
 	struct nss_ppe_msg *msg = (struct nss_ppe_msg *)ncm;
 	void *ctx;

 	nss_ppe_msg_callback_t cb;

 	nss_trace("nss_ctx: %px ppe msg: %px\n", nss_ctx, msg);
 	BUG_ON(!nss_ppe_verify_ifnum(ncm->interface));

 	/*
 	 * Trace messages.
 	 */
 	nss_ppe_log_rx_msg(msg);

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

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

 	switch (msg->cm.type) {
 	case NSS_PPE_MSG_SYNC_STATS:
 		/*
 		 * session debug stats embeded in session stats msg
 		 */
 		nss_ppe_stats_sync(nss_ctx, &msg->msg.stats, ncm->interface);
 		nss_ppe_stats_notify(nss_ctx, ncm->interface);
 		return;
 	}

 	/*
 	 * Log failures
 	 */
 	nss_core_log_msg_failures(nss_ctx, ncm);

 	/*
 	 * Do we have a call back
 	 */
 	if (!ncm->cb) {
 		return;
 	}

 	/*
 	 * callback
 	 */
 	cb = (nss_ppe_msg_callback_t)ncm->cb;
 	ctx = (void *)ncm->app_data;

 	cb(ctx, msg);
 }

 /*
  * nss_ppe_register_handler()
  *	debugfs stats msg handler received on static ppe interface
  *
  *	TODO: Export API so that others can also read PPE stats.
  */
 void nss_ppe_register_handler(void)
 {
 	struct nss_ctx_instance *nss_ctx = nss_ppe_get_context();

 	nss_core_register_handler(nss_ctx, NSS_PPE_INTERFACE, nss_ppe_handler, NULL);

 	if (nss_ppe_debug_stats.valid) {
 		nss_ppe_stats_dentry_create();
 		nss_ppe_strings_dentry_create();
 	}
 }

 /*
  * nss_ppe_free()
  *	Uninitialize PPE base
  */
 void nss_ppe_free(void)
 {
 	/*
 	 * Check if PPE base is already uninitialized.
 	 */
 	if (!ppe_pvt.ppe_base) {
 		return;
 	}

 	/*
 	 * Unmap PPE base address
 	 */
 	iounmap(ppe_pvt.ppe_base);
 	ppe_pvt.ppe_base = NULL;

 	spin_lock_bh(&nss_ppe_stats_lock);
 	nss_ppe_debug_stats.valid = false;
 	nss_ppe_debug_stats.if_num = 0;
 	nss_ppe_debug_stats.if_index = 0;
 	spin_unlock_bh(&nss_ppe_stats_lock);
 }

 /*
  * nss_ppe_init()
  *	Initialize PPE base
  */
 void nss_ppe_init(void)
 {
 	/*
 	 * Check if PPE base is already initialized.
 	 */
 	if (ppe_pvt.ppe_base) {
 		return;
 	}

 	/*
 	 * Get the PPE base address
 	 */
 	ppe_pvt.ppe_base = ioremap_nocache(PPE_BASE_ADDR, PPE_REG_SIZE);
 	if (!ppe_pvt.ppe_base) {
 		nss_warning("DRV can't get PPE base address\n");
 		return;
 	}

 	spin_lock_bh(&nss_ppe_stats_lock);
 	nss_ppe_debug_stats.valid = true;
 	nss_ppe_debug_stats.if_num = 0;
 	nss_ppe_debug_stats.if_index = 0;
 	spin_unlock_bh(&nss_ppe_stats_lock);

 	sema_init(&ppe_pvt.sem, 1);
 	init_completion(&ppe_pvt.complete);
 }
	/*
	**************************************************************************
	* Copyright (c) 2016-2018, 2020-2021, 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.
	**************************************************************************
	*/

	#include "nss_ppe.h"
	#include "nss_ppe_stats.h"
	#include "nss_ppe_strings.h"

	DEFINE_SPINLOCK(nss_ppe_stats_lock);

	struct nss_ppe_stats_debug nss_ppe_debug_stats;
	struct nss_ppe_pvt ppe_pvt;

	/*
	* nss_ppe_verify_ifnum()
	* Verify PPE interface number.
	*/
	static inline bool nss_ppe_verify_ifnum(int if_num)
	{
	return nss_is_dynamic_interface(if_num) \|\| (if_num == NSS_PPE_INTERFACE);
	}

	/*
	* nss_ppe_callback()
	* Callback to handle the completion of NSS->HLOS messages.
	*/
	static void nss_ppe_callback(void app_data, struct nss_ppe_msg npm)
	{
	nss_ppe_msg_callback_t callback = (nss_ppe_msg_callback_t)ppe_pvt.cb;
	void *data = ppe_pvt.app_data;

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

	if (npm->cm.response != NSS_CMN_RESPONSE_ACK) {
	nss_warning("ppe error response %d\n", npm->cm.response);
	ppe_pvt.response = npm->cm.response;
	}

	if (callback) {
	callback(data, npm);
	}
	complete(&ppe_pvt.complete);
	}

	/*
	* nss_ppe_tx_msg()
	* Transmit a ppe message to NSSFW
	*/
	nss_tx_status_t nss_ppe_tx_msg(struct nss_ctx_instance nss_ctx, struct nss_ppe_msg msg)
	{
	struct nss_cmn_msg *ncm = &msg->cm;

	/*
	* Trace messages.
	*/
	nss_ppe_log_tx_msg(msg);

	/*
	* Sanity check the message
	*/
	if (ncm->type >= NSS_PPE_MSG_MAX) {
	nss_warning("%px: message type out of range: %d\n", nss_ctx, ncm->type);
	return NSS_TX_FAILURE;
	}

	if (!nss_ppe_verify_ifnum(ncm->interface)) {
	nss_warning("%px: invalid interface %d\n", nss_ctx, ncm->interface);
	return NSS_TX_FAILURE;
	}

	return nss_core_send_cmd(nss_ctx, msg, sizeof(*msg), NSS_NBUF_PAYLOAD_SIZE);
	}

	/*
	* nss_ppe_tx_msg_sync()
	* Transmit a ppe message to NSS firmware synchronously.
	*/
	nss_tx_status_t nss_ppe_tx_msg_sync(struct nss_ctx_instance nss_ctx, struct nss_ppe_msg npm)
	{
	nss_tx_status_t status;
	int ret = 0;

	down(&ppe_pvt.sem);
	ppe_pvt.cb = (void *)npm->cm.cb;
	ppe_pvt.app_data = (void *)npm->cm.app_data;

	npm->cm.cb = (nss_ptr_t)nss_ppe_callback;
	npm->cm.app_data = (nss_ptr_t)NULL;

	status = nss_ppe_tx_msg(nss_ctx, npm);
	if (status != NSS_TX_SUCCESS) {
	nss_warning("%px: ppe_tx_msg failed\n", nss_ctx);
	up(&ppe_pvt.sem);
	return status;
	}

	ret = wait_for_completion_timeout(&ppe_pvt.complete, msecs_to_jiffies(NSS_PPE_TX_TIMEOUT));
	if (!ret) {
	nss_warning("%px: ppe msg tx failed due to timeout\n", nss_ctx);
	ppe_pvt.response = NSS_TX_FAILURE;
	}

	status = ppe_pvt.response;
	up(&ppe_pvt.sem);
	return status;
	}

	/*
	* nss_ppe_get_context()
	* Get NSS context instance for ppe
	*/
	struct nss_ctx_instance *nss_ppe_get_context(void)
	{
	return (struct nss_ctx_instance *)&nss_top_main.nss[nss_top_main.ppe_handler_id];
	}

	/*
	* nss_ppe_msg_init()
	* Initialize nss_ppe_msg.
	*/
	void nss_ppe_msg_init(struct nss_ppe_msg ncm, uint16_t if_num, uint32_t type, uint32_t len, void cb, void *app_data)
	{
	nss_cmn_msg_init(&ncm->cm, if_num, type, len, cb, app_data);
	}

	/*
	* nss_ppe_tx_ipsec_config_msg
	* API to send inline IPsec port configure message to NSS FW
	*/
	nss_tx_status_t nss_ppe_tx_ipsec_config_msg(uint32_t nss_ifnum, uint32_t vsi_num, uint16_t mtu,
	__attribute__((unused))uint16_t mru)
	{
	struct nss_ctx_instance *nss_ctx = nss_ppe_get_context();
	struct nss_ppe_msg npm = {0};

	if (!nss_ctx) {
	nss_warning("Can't get nss context\n");
	return NSS_TX_FAILURE;
	}

	if (vsi_num >= NSS_PPE_VSI_NUM_MAX) {
	nss_warning("Invalid vsi number:%u\n", vsi_num);
	return NSS_TX_FAILURE;
	}

	nss_ppe_msg_init(&npm, NSS_PPE_INTERFACE, NSS_PPE_MSG_IPSEC_PORT_CONFIG,
	sizeof(struct nss_ppe_ipsec_port_config_msg), NULL, NULL);

	npm.msg.ipsec_config.nss_ifnum = nss_ifnum;
	npm.msg.ipsec_config.vsi_num = vsi_num;
	npm.msg.ipsec_config.mtu = mtu;

	return nss_ppe_tx_msg_sync(nss_ctx, &npm);
	}

	/*
	* nss_ppe_tx_ipsec_mtu_msg
	* API to send IPsec port MTU change message to NSS FW
	*/
	nss_tx_status_t nss_ppe_tx_ipsec_mtu_msg(uint32_t nss_ifnum, uint16_t mtu, __attribute__((unused))uint16_t mru)
	{
	struct nss_ctx_instance *nss_ctx = nss_ppe_get_context();
	struct nss_ppe_msg npm = {0};

	if (!nss_ctx) {
	nss_warning("Can't get nss context\n");
	return NSS_TX_FAILURE;
	}

	nss_ppe_msg_init(&npm, NSS_PPE_INTERFACE, NSS_PPE_MSG_IPSEC_PORT_MTU_CHANGE,
	sizeof(struct nss_ppe_ipsec_port_mtu_msg), NULL, NULL);

	npm.msg.ipsec_mtu.nss_ifnum = nss_ifnum;
	npm.msg.ipsec_mtu.mtu = mtu;

	return nss_ppe_tx_msg_sync(nss_ctx, &npm);
	}

	/*
	* nss_ppe_tx_ipsec_add_intf_msg
	* API to attach NSS interface to IPsec port
	*/
	nss_tx_status_t nss_ppe_tx_ipsec_add_intf_msg(uint32_t nss_ifnum)
	{
	struct nss_ctx_instance *nss_ctx = nss_ppe_get_context();
	struct nss_ppe_msg npm = {0};

	if (!nss_ctx) {
	nss_warning("Can't get nss context\n");
	return NSS_TX_FAILURE;
	}

	nss_ppe_msg_init(&npm, NSS_PPE_INTERFACE, NSS_PPE_MSG_IPSEC_ADD_INTF,
	sizeof(struct nss_ppe_ipsec_add_intf_msg), NULL, NULL);

	npm.msg.ipsec_addif.nss_ifnum = nss_ifnum;

	return nss_ppe_tx_msg_sync(nss_ctx, &npm);
	}

	/*
	* nss_ppe_tx_ipsec_del_intf_msg
	* API to detach NSS interface to IPsec port
	*/
	nss_tx_status_t nss_ppe_tx_ipsec_del_intf_msg(uint32_t nss_ifnum)
	{
	struct nss_ctx_instance *nss_ctx = nss_ppe_get_context();
	struct nss_ppe_msg npm = {0};

	if (!nss_ctx) {
	nss_warning("Can't get nss context\n");
	return NSS_TX_FAILURE;
	}

	nss_ppe_msg_init(&npm, NSS_PPE_INTERFACE, NSS_PPE_MSG_IPSEC_DEL_INTF,
	sizeof(struct nss_ppe_ipsec_del_intf_msg), NULL, NULL);

	npm.msg.ipsec_delif.nss_ifnum = nss_ifnum;

	return nss_ppe_tx_msg_sync(nss_ctx, &npm);
	}

	/*
	* nss_ppe_handler()
	* Handle NSS -> HLOS messages for ppe
	*/
	static void nss_ppe_handler(struct nss_ctx_instance nss_ctx, struct nss_cmn_msg ncm, __attribute__((unused))void *app_data)
	{
	struct nss_ppe_msg msg = (struct nss_ppe_msg )ncm;
	void *ctx;

	nss_ppe_msg_callback_t cb;

	nss_trace("nss_ctx: %px ppe msg: %px\n", nss_ctx, msg);
	BUG_ON(!nss_ppe_verify_ifnum(ncm->interface));

	/*
	* Trace messages.
	*/
	nss_ppe_log_rx_msg(msg);

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

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

	switch (msg->cm.type) {
	case NSS_PPE_MSG_SYNC_STATS:
	/*
	* session debug stats embeded in session stats msg
	*/
	nss_ppe_stats_sync(nss_ctx, &msg->msg.stats, ncm->interface);
	nss_ppe_stats_notify(nss_ctx, ncm->interface);
	return;
	}

	/*
	* Log failures
	*/
	nss_core_log_msg_failures(nss_ctx, ncm);

	/*
	* Do we have a call back
	*/
	if (!ncm->cb) {
	return;
	}

	/*
	* callback
	*/
	cb = (nss_ppe_msg_callback_t)ncm->cb;
	ctx = (void *)ncm->app_data;

	cb(ctx, msg);
	}

	/*
	* nss_ppe_register_handler()
	* debugfs stats msg handler received on static ppe interface
	*
	* TODO: Export API so that others can also read PPE stats.
	*/
	void nss_ppe_register_handler(void)
	{
	struct nss_ctx_instance *nss_ctx = nss_ppe_get_context();

	nss_core_register_handler(nss_ctx, NSS_PPE_INTERFACE, nss_ppe_handler, NULL);

	if (nss_ppe_debug_stats.valid) {
	nss_ppe_stats_dentry_create();
	nss_ppe_strings_dentry_create();
	}
	}

	/*
	* nss_ppe_free()
	* Uninitialize PPE base
	*/
	void nss_ppe_free(void)
	{
	/*
	* Check if PPE base is already uninitialized.
	*/
	if (!ppe_pvt.ppe_base) {
	return;
	}

	/*
	* Unmap PPE base address
	*/
	iounmap(ppe_pvt.ppe_base);
	ppe_pvt.ppe_base = NULL;

	spin_lock_bh(&nss_ppe_stats_lock);
	nss_ppe_debug_stats.valid = false;
	nss_ppe_debug_stats.if_num = 0;
	nss_ppe_debug_stats.if_index = 0;
	spin_unlock_bh(&nss_ppe_stats_lock);
	}

	/*
	* nss_ppe_init()
	* Initialize PPE base
	*/
	void nss_ppe_init(void)
	{
	/*
	* Check if PPE base is already initialized.
	*/
	if (ppe_pvt.ppe_base) {
	return;
	}

	/*
	* Get the PPE base address
	*/
	ppe_pvt.ppe_base = ioremap_nocache(PPE_BASE_ADDR, PPE_REG_SIZE);
	if (!ppe_pvt.ppe_base) {
	nss_warning("DRV can't get PPE base address\n");
	return;
	}

	spin_lock_bh(&nss_ppe_stats_lock);
	nss_ppe_debug_stats.valid = true;
	nss_ppe_debug_stats.if_num = 0;
	nss_ppe_debug_stats.if_index = 0;
	spin_unlock_bh(&nss_ppe_stats_lock);

	sema_init(&ppe_pvt.sem, 1);
	init_completion(&ppe_pvt.complete);
	}