nss_ppe.c - codeaurora/quic/qsdk/oss/lklm/nss-drv - Gitiles

 /*
  **************************************************************************
  * Copyright (c) 2016, 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"

 /*
  * 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_stats_sync
  *	PPE connection sync stats from NSS
  */
 static void nss_ppe_stats_sync(struct nss_ctx_instance *nss_ctx, struct nss_ppe_sync_stats_msg *stats_msg, uint16_t if_num)
 {
 	spin_lock_bh(&nss_ppe_stats_lock);
 	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V4_L3_FLOWS] += stats_msg->nss_ppe_v4_l3_flows;
 	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V4_L2_FLOWS] += stats_msg->nss_ppe_v4_l2_flows;
 	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V4_CREATE_REQ] += stats_msg->nss_ppe_v4_create_req;
 	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V4_CREATE_FAIL] += stats_msg->nss_ppe_v4_create_fail;
 	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V4_DESTROY_REQ] += stats_msg->nss_ppe_v4_destroy_req;
 	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V4_DESTROY_FAIL] += stats_msg->nss_ppe_v4_destroy_fail;

 	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V6_L3_FLOWS] += stats_msg->nss_ppe_v6_l3_flows;
 	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V6_L2_FLOWS] += stats_msg->nss_ppe_v6_l2_flows;
 	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V6_CREATE_REQ] += stats_msg->nss_ppe_v6_create_req;
 	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V6_CREATE_FAIL] += stats_msg->nss_ppe_v6_create_fail;
 	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V6_DESTROY_REQ] += stats_msg->nss_ppe_v6_destroy_req;
 	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V6_DESTROY_FAIL] += stats_msg->nss_ppe_v6_destroy_fail;

 	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_FAIL_NH_FULL] += stats_msg->nss_ppe_fail_nh_full;
 	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_FAIL_FLOW_FULL] += stats_msg->nss_ppe_fail_flow_full;
 	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_FAIL_HOST_FULL] += stats_msg->nss_ppe_fail_host_full;
 	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_FAIL_PUBIP_FULL] += stats_msg->nss_ppe_fail_pubip_full;
 	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_FAIL_PORT_SETUP] += stats_msg->nss_ppe_fail_port_setup;
 	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_FAIL_RW_FIFO_FULL] += stats_msg->nss_ppe_fail_rw_fifo_full;
 	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_FAIL_FLOW_COMMAND] += stats_msg->nss_ppe_fail_flow_command;
 	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_FAIL_UNKNOWN_PROTO] += stats_msg->nss_ppe_fail_unknown_proto;
 	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_FAIL_PPE_UNRESPONSIVE] += stats_msg->nss_ppe_fail_ppe_unresponsive;
 	spin_unlock_bh(&nss_ppe_stats_lock);
 }

 /*
  * nss_ppe_stats_conn_get()
  *	Get ppe connection stats.
  */
 void nss_ppe_stats_conn_get(uint32_t *stats)
 {
 	if (!stats) {
 		nss_warning("No memory to copy ppe connection stats");
 		return;
 	}

 	spin_lock_bh(&nss_ppe_stats_lock);

 	if (!nss_ppe_debug_stats.valid) {
 		spin_unlock_bh(&nss_ppe_stats_lock);
 		nss_warning("PPE base address not initialized!\n");
 		return;
 	}

 	/*
 	 * Get flow stats
 	 */
 	memcpy(stats, nss_ppe_debug_stats.conn_stats, (sizeof(uint32_t) * NSS_STATS_PPE_CONN_MAX));

 	spin_unlock_bh(&nss_ppe_stats_lock);
 }

 /*
  * nss_ppe_stats_l3_get()
  *	Get ppe L3 debug stats.
  */
 void nss_ppe_stats_l3_get(uint32_t *stats)
 {
 	if (!stats) {
 		nss_warning("No memory to copy ppe l3 dbg stats\n");
 		return;
 	}

 	spin_lock_bh(&nss_ppe_stats_lock);

 	if (!nss_ppe_debug_stats.valid) {
 		spin_unlock_bh(&nss_ppe_stats_lock);
 		nss_warning("PPE base address not initialized!\n");
 		return;
 	}

 	nss_ppe_reg_write(PPE_L3_DBG_WR_OFFSET, PPE_L3_DBG0_OFFSET);
 	nss_ppe_reg_read(PPE_L3_DBG_RD_OFFSET, &stats[NSS_STATS_PPE_L3_DBG_0]);

 	nss_ppe_reg_write(PPE_L3_DBG_WR_OFFSET, PPE_L3_DBG1_OFFSET);
 	nss_ppe_reg_read(PPE_L3_DBG_RD_OFFSET, &stats[NSS_STATS_PPE_L3_DBG_1]);

 	nss_ppe_reg_write(PPE_L3_DBG_WR_OFFSET, PPE_L3_DBG2_OFFSET);
 	nss_ppe_reg_read(PPE_L3_DBG_RD_OFFSET, &stats[NSS_STATS_PPE_L3_DBG_2]);

 	nss_ppe_reg_write(PPE_L3_DBG_WR_OFFSET, PPE_L3_DBG3_OFFSET);
 	nss_ppe_reg_read(PPE_L3_DBG_RD_OFFSET, &stats[NSS_STATS_PPE_L3_DBG_3]);

 	nss_ppe_reg_write(PPE_L3_DBG_WR_OFFSET, PPE_L3_DBG4_OFFSET);
 	nss_ppe_reg_read(PPE_L3_DBG_RD_OFFSET, &stats[NSS_STATS_PPE_L3_DBG_4]);

 	nss_ppe_reg_write(PPE_L3_DBG_WR_OFFSET, PPE_L3_DBG_PORT_OFFSET);
 	nss_ppe_reg_read(PPE_L3_DBG_RD_OFFSET, &stats[NSS_STATS_PPE_L3_DBG_PORT]);

 	spin_unlock_bh(&nss_ppe_stats_lock);
 }

 /*
  * nss_ppe_stats_code_get()
  *	Get ppe CPU and DROP code for last packet processed.
  */
 void nss_ppe_stats_code_get(uint32_t *stats)
 {
 	uint32_t drop_0, drop_1, cpu_code;

 	nss_trace("%s(%d) Start\n", __func__, __LINE__);
 	if (!stats) {
 		nss_warning("No memory to copy ppe code\n");
 		return;
 	}

 	if (!nss_ppe_debug_stats.valid) {
 		nss_warning("PPE base address not initialized!\n");
 		return;
 	}

 	spin_lock_bh(&nss_ppe_stats_lock);
 	nss_ppe_reg_write(PPE_PKT_CODE_WR_OFFSET, PPE_PKT_CODE_DROP0_OFFSET);
 	nss_ppe_reg_read(PPE_PKT_CODE_RD_OFFSET, &drop_0);

 	nss_ppe_reg_write(PPE_PKT_CODE_WR_OFFSET, PPE_PKT_CODE_DROP1_OFFSET);
 	nss_ppe_reg_read(PPE_PKT_CODE_RD_OFFSET, &drop_1);

 	stats[NSS_STATS_PPE_CODE_DROP] = PPE_PKT_CODE_DROP_GET(drop_0, drop_1);

 	nss_ppe_reg_write(PPE_PKT_CODE_WR_OFFSET, PPE_PKT_CODE_CPU_OFFSET);
 	nss_ppe_reg_read(PPE_PKT_CODE_RD_OFFSET, &cpu_code);

 	stats[NSS_STATS_PPE_CODE_CPU] = PPE_PKT_CODE_CPU_GET(cpu_code);

 	spin_unlock_bh(&nss_ppe_stats_lock);
 }

 /*
  * nss_ppe_handler()
  *	Handle NSS -> HLOS messages for ppe tunnel
  */
 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;

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

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

 	if (nss_cmn_get_msg_len(ncm) > sizeof(struct nss_ppe_msg)) {
 		nss_warning("%p: Length of message is greater than required: %d", 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);
 		break;
 	}
 }

 /*
  * 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)
 {
 	nss_core_register_handler(NSS_PPE_INTERFACE, nss_ppe_handler, NULL);
 }

 /*
  * 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);
 }
	/*
	**************************************************************************
	* Copyright (c) 2016, 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"

	/*
	* 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_stats_sync
	* PPE connection sync stats from NSS
	*/
	static void nss_ppe_stats_sync(struct nss_ctx_instance nss_ctx, struct nss_ppe_sync_stats_msg stats_msg, uint16_t if_num)
	{
	spin_lock_bh(&nss_ppe_stats_lock);
	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V4_L3_FLOWS] += stats_msg->nss_ppe_v4_l3_flows;
	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V4_L2_FLOWS] += stats_msg->nss_ppe_v4_l2_flows;
	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V4_CREATE_REQ] += stats_msg->nss_ppe_v4_create_req;
	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V4_CREATE_FAIL] += stats_msg->nss_ppe_v4_create_fail;
	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V4_DESTROY_REQ] += stats_msg->nss_ppe_v4_destroy_req;
	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V4_DESTROY_FAIL] += stats_msg->nss_ppe_v4_destroy_fail;

	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V6_L3_FLOWS] += stats_msg->nss_ppe_v6_l3_flows;
	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V6_L2_FLOWS] += stats_msg->nss_ppe_v6_l2_flows;
	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V6_CREATE_REQ] += stats_msg->nss_ppe_v6_create_req;
	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V6_CREATE_FAIL] += stats_msg->nss_ppe_v6_create_fail;
	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V6_DESTROY_REQ] += stats_msg->nss_ppe_v6_destroy_req;
	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_V6_DESTROY_FAIL] += stats_msg->nss_ppe_v6_destroy_fail;

	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_FAIL_NH_FULL] += stats_msg->nss_ppe_fail_nh_full;
	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_FAIL_FLOW_FULL] += stats_msg->nss_ppe_fail_flow_full;
	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_FAIL_HOST_FULL] += stats_msg->nss_ppe_fail_host_full;
	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_FAIL_PUBIP_FULL] += stats_msg->nss_ppe_fail_pubip_full;
	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_FAIL_PORT_SETUP] += stats_msg->nss_ppe_fail_port_setup;
	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_FAIL_RW_FIFO_FULL] += stats_msg->nss_ppe_fail_rw_fifo_full;
	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_FAIL_FLOW_COMMAND] += stats_msg->nss_ppe_fail_flow_command;
	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_FAIL_UNKNOWN_PROTO] += stats_msg->nss_ppe_fail_unknown_proto;
	nss_ppe_debug_stats.conn_stats[NSS_STATS_PPE_FAIL_PPE_UNRESPONSIVE] += stats_msg->nss_ppe_fail_ppe_unresponsive;
	spin_unlock_bh(&nss_ppe_stats_lock);
	}

	/*
	* nss_ppe_stats_conn_get()
	* Get ppe connection stats.
	*/
	void nss_ppe_stats_conn_get(uint32_t *stats)
	{
	if (!stats) {
	nss_warning("No memory to copy ppe connection stats");
	return;
	}

	spin_lock_bh(&nss_ppe_stats_lock);

	if (!nss_ppe_debug_stats.valid) {
	spin_unlock_bh(&nss_ppe_stats_lock);
	nss_warning("PPE base address not initialized!\n");
	return;
	}

	/*
	* Get flow stats
	*/
	memcpy(stats, nss_ppe_debug_stats.conn_stats, (sizeof(uint32_t) * NSS_STATS_PPE_CONN_MAX));

	spin_unlock_bh(&nss_ppe_stats_lock);
	}

	/*
	* nss_ppe_stats_l3_get()
	* Get ppe L3 debug stats.
	*/
	void nss_ppe_stats_l3_get(uint32_t *stats)
	{
	if (!stats) {
	nss_warning("No memory to copy ppe l3 dbg stats\n");
	return;
	}

	spin_lock_bh(&nss_ppe_stats_lock);

	if (!nss_ppe_debug_stats.valid) {
	spin_unlock_bh(&nss_ppe_stats_lock);
	nss_warning("PPE base address not initialized!\n");
	return;
	}

	nss_ppe_reg_write(PPE_L3_DBG_WR_OFFSET, PPE_L3_DBG0_OFFSET);
	nss_ppe_reg_read(PPE_L3_DBG_RD_OFFSET, &stats[NSS_STATS_PPE_L3_DBG_0]);

	nss_ppe_reg_write(PPE_L3_DBG_WR_OFFSET, PPE_L3_DBG1_OFFSET);
	nss_ppe_reg_read(PPE_L3_DBG_RD_OFFSET, &stats[NSS_STATS_PPE_L3_DBG_1]);

	nss_ppe_reg_write(PPE_L3_DBG_WR_OFFSET, PPE_L3_DBG2_OFFSET);
	nss_ppe_reg_read(PPE_L3_DBG_RD_OFFSET, &stats[NSS_STATS_PPE_L3_DBG_2]);

	nss_ppe_reg_write(PPE_L3_DBG_WR_OFFSET, PPE_L3_DBG3_OFFSET);
	nss_ppe_reg_read(PPE_L3_DBG_RD_OFFSET, &stats[NSS_STATS_PPE_L3_DBG_3]);

	nss_ppe_reg_write(PPE_L3_DBG_WR_OFFSET, PPE_L3_DBG4_OFFSET);
	nss_ppe_reg_read(PPE_L3_DBG_RD_OFFSET, &stats[NSS_STATS_PPE_L3_DBG_4]);

	nss_ppe_reg_write(PPE_L3_DBG_WR_OFFSET, PPE_L3_DBG_PORT_OFFSET);
	nss_ppe_reg_read(PPE_L3_DBG_RD_OFFSET, &stats[NSS_STATS_PPE_L3_DBG_PORT]);

	spin_unlock_bh(&nss_ppe_stats_lock);
	}

	/*
	* nss_ppe_stats_code_get()
	* Get ppe CPU and DROP code for last packet processed.
	*/
	void nss_ppe_stats_code_get(uint32_t *stats)
	{
	uint32_t drop_0, drop_1, cpu_code;

	nss_trace("%s(%d) Start\n", __func__, __LINE__);
	if (!stats) {
	nss_warning("No memory to copy ppe code\n");
	return;
	}

	if (!nss_ppe_debug_stats.valid) {
	nss_warning("PPE base address not initialized!\n");
	return;
	}

	spin_lock_bh(&nss_ppe_stats_lock);
	nss_ppe_reg_write(PPE_PKT_CODE_WR_OFFSET, PPE_PKT_CODE_DROP0_OFFSET);
	nss_ppe_reg_read(PPE_PKT_CODE_RD_OFFSET, &drop_0);

	nss_ppe_reg_write(PPE_PKT_CODE_WR_OFFSET, PPE_PKT_CODE_DROP1_OFFSET);
	nss_ppe_reg_read(PPE_PKT_CODE_RD_OFFSET, &drop_1);

	stats[NSS_STATS_PPE_CODE_DROP] = PPE_PKT_CODE_DROP_GET(drop_0, drop_1);

	nss_ppe_reg_write(PPE_PKT_CODE_WR_OFFSET, PPE_PKT_CODE_CPU_OFFSET);
	nss_ppe_reg_read(PPE_PKT_CODE_RD_OFFSET, &cpu_code);

	stats[NSS_STATS_PPE_CODE_CPU] = PPE_PKT_CODE_CPU_GET(cpu_code);

	spin_unlock_bh(&nss_ppe_stats_lock);
	}

	/*
	* nss_ppe_handler()
	* Handle NSS -> HLOS messages for ppe tunnel
	*/
	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;

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

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

	if (nss_cmn_get_msg_len(ncm) > sizeof(struct nss_ppe_msg)) {
	nss_warning("%p: Length of message is greater than required: %d", 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);
	break;
	}
	}

	/*
	* 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)
	{
	nss_core_register_handler(NSS_PPE_INTERFACE, nss_ppe_handler, NULL);
	}

	/*
	* 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);
	}