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

 /*
  **************************************************************************
  * Copyright (c) 2016-2020, 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_tx_rx_common.h"
 #include "nss_map_t_stats.h"
 #include "nss_map_t_log.h"
 #include "nss_map_t_strings.h"

 #define NSS_MAP_T_TX_TIMEOUT 3000 /* 3 Seconds */

 /*
  * Private data structure
  */
 static struct {
 	struct semaphore sem;
 	struct completion complete;
 	int response;
 	void *cb;
 	void *app_data;
 } nss_map_t_pvt;

 /*
  * Data structures to store map_t nss debug stats
  */
 static DEFINE_SPINLOCK(nss_map_t_debug_stats_lock);
 static struct nss_map_t_stats_instance_debug nss_map_t_debug_stats[NSS_MAX_MAP_T_DYNAMIC_INTERFACES];

 /*
  * nss_map_t_verify_if_num()
  *	Verify if_num passed to us.
  */
 static bool nss_map_t_verify_if_num(uint32_t if_num)
 {
 	enum nss_dynamic_interface_type if_type;

 	if (nss_is_dynamic_interface(if_num) == false) {
 		return false;
 	}

 	if_type = nss_dynamic_interface_get_type(nss_map_t_get_context(), if_num);
 	switch (if_type) {
 	case NSS_DYNAMIC_INTERFACE_TYPE_MAP_T_INNER:
 	case NSS_DYNAMIC_INTERFACE_TYPE_MAP_T_OUTER:
 		return true;

 	default:
 		return false;
 	}
 }

 /*
  * nss_map_t_instance_debug_stats_sync
  *	debug stats for map_t
  */
 void nss_map_t_instance_debug_stats_sync(struct nss_ctx_instance *nss_ctx, struct nss_map_t_sync_stats_msg *stats_msg, uint16_t if_num)
 {
 	int i;
 	enum nss_dynamic_interface_type if_type;

 	if_type = nss_dynamic_interface_get_type(nss_ctx, if_num);

 	spin_lock_bh(&nss_map_t_debug_stats_lock);
 	for (i = 0; i < NSS_MAX_MAP_T_DYNAMIC_INTERFACES; i++) {
 		if (nss_map_t_debug_stats[i].if_num != if_num) {
 			continue;
 		}
 		switch (if_type) {
 		case NSS_DYNAMIC_INTERFACE_TYPE_MAP_T_INNER:
 			nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V4_TO_V6_PBUF_EXCEPTION] +=
 				stats_msg->debug_stats.v4_to_v6.exception_pkts;
 			nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V4_TO_V6_PBUF_NO_MATCHING_RULE] +=
 				stats_msg->debug_stats.v4_to_v6.no_matching_rule;
 			nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V4_TO_V6_PBUF_NOT_TCP_OR_UDP] +=
 				stats_msg->debug_stats.v4_to_v6.not_tcp_or_udp;
 			nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V4_TO_V6_RULE_ERR_LOCAL_PSID] +=
 				stats_msg->debug_stats.v4_to_v6.rule_err_local_psid;
 			nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V4_TO_V6_RULE_ERR_LOCAL_IPV6] +=
 				stats_msg->debug_stats.v4_to_v6.rule_err_local_ipv6;
 			nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V4_TO_V6_RULE_ERR_REMOTE_PSID] +=
 				stats_msg->debug_stats.v4_to_v6.rule_err_remote_psid;
 			nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V4_TO_V6_RULE_ERR_REMOTE_EA_BITS] +=
 				stats_msg->debug_stats.v4_to_v6.rule_err_remote_ea_bits;
 			nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V4_TO_V6_RULE_ERR_REMOTE_IPV6] +=
 				stats_msg->debug_stats.v4_to_v6.rule_err_remote_ipv6;
 			break;

 		case NSS_DYNAMIC_INTERFACE_TYPE_MAP_T_OUTER:
 			nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V6_TO_V4_PBUF_EXCEPTION] +=
 				stats_msg->debug_stats.v6_to_v4.exception_pkts;
 			nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V6_TO_V4_PBUF_NO_MATCHING_RULE] +=
 				stats_msg->debug_stats.v6_to_v4.no_matching_rule;
 			nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V6_TO_V4_PBUF_NOT_TCP_OR_UDP] +=
 				stats_msg->debug_stats.v6_to_v4.not_tcp_or_udp;
 			nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V6_TO_V4_RULE_ERR_LOCAL_IPV4] +=
 				stats_msg->debug_stats.v6_to_v4.rule_err_local_ipv4;
 			nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V6_TO_V4_RULE_ERR_REMOTE_IPV4] +=
 				stats_msg->debug_stats.v6_to_v4.rule_err_remote_ipv4;
 			break;

 		default:
 			nss_warning("Invalid MAP-T interface encountered: %u\n", if_type);
 			break;
 		}
 	}
 	spin_unlock_bh(&nss_map_t_debug_stats_lock);
 }

 /*
  * nss_map_t_instance_debug_stats_get()
  *	Get map_t statitics.
  */
 void nss_map_t_instance_debug_stats_get(void *stats_mem)
 {
 	struct nss_map_t_stats_instance_debug *stats = (struct nss_map_t_stats_instance_debug *)stats_mem;
 	int i;

 	if (!stats) {
 		nss_warning("No memory to copy map_t stats");
 		return;
 	}

 	spin_lock_bh(&nss_map_t_debug_stats_lock);
 	for (i = 0; i < NSS_MAX_MAP_T_DYNAMIC_INTERFACES; i++) {
 		if (nss_map_t_debug_stats[i].valid) {
 			memcpy(stats, &nss_map_t_debug_stats[i], sizeof(struct nss_map_t_stats_instance_debug));
 			stats++;
 		}
 	}
 	spin_unlock_bh(&nss_map_t_debug_stats_lock);
 }

 /*
  * nss_map_t_handler()
  *	Handle NSS -> HLOS messages for map_t tunnel
  */
 static void nss_map_t_handler(struct nss_ctx_instance *nss_ctx, struct nss_cmn_msg *ncm, __attribute__((unused))void *app_data)
 {
 	struct nss_map_t_msg *ntm = (struct nss_map_t_msg *)ncm;
 	void *ctx;

 	nss_map_t_msg_callback_t cb;

 	NSS_VERIFY_CTX_MAGIC(nss_ctx);
 	BUG_ON(!nss_map_t_verify_if_num(ncm->interface));

 	/*
 	 * Trace Messages
 	 */
 	nss_map_t_log_rx_msg(ntm);

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

 	if (nss_cmn_get_msg_len(ncm) > sizeof(struct nss_map_t_msg)) {
 		nss_warning("%px: tx request for another interface: %d", nss_ctx, ncm->interface);
 		return;
 	}

 	switch (ntm->cm.type) {
 	case NSS_MAP_T_MSG_SYNC_STATS:
 		/*
 		 * Update debug stats in stats msg and send statistics notifications to the registered modules
 		 */
 		nss_map_t_instance_debug_stats_sync(nss_ctx, &ntm->msg.stats, ncm->interface);
 		nss_map_t_stats_notify(nss_ctx, ncm->interface);
 		break;
 	}

 	/*
 	 * Update the callback and app_data for NOTIFY messages, map_t sends all notify messages
 	 * to the same callback/app_data.
 	 */
 	if (ncm->response == NSS_CMN_RESPONSE_NOTIFY) {
 		ncm->cb = (nss_ptr_t)nss_ctx->nss_top->map_t_msg_callback;
 		ncm->app_data = (nss_ptr_t)nss_ctx->subsys_dp_register[ncm->interface].app_data;
 	}

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

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

 	/*
 	 * call map-t callback
 	 */
 	if (!cb) {
 		nss_warning("%px: No callback for map-t interface %d",
 			    nss_ctx, ncm->interface);
 		return;
 	}

 	cb(ctx, ntm);
 }

 /*
  * nss_map_t_callback()
  *	Callback to handle the completion of NSS->HLOS messages.
  */
 static void nss_map_t_callback(void *app_data, struct nss_map_t_msg *nim)
 {
 	nss_map_t_msg_callback_t callback = (nss_map_t_msg_callback_t)nss_map_t_pvt.cb;
 	void *data = nss_map_t_pvt.app_data;

 	nss_map_t_pvt.cb = NULL;
 	nss_map_t_pvt.app_data = NULL;

 	if (nim->cm.response != NSS_CMN_RESPONSE_ACK) {
 		nss_warning("map_t Error response %d\n", nim->cm.response);
 		nss_map_t_pvt.response = NSS_TX_FAILURE;
 	} else {
 		nss_map_t_pvt.response = NSS_TX_SUCCESS;
 	}

 	if (callback) {
 		callback(data, nim);
 	}

 	complete(&nss_map_t_pvt.complete);
 }

 /*
  * nss_map_t_tx()
  *	Transmit a map_t message to NSS firmware
  */
 nss_tx_status_t nss_map_t_tx(struct nss_ctx_instance *nss_ctx, struct nss_map_t_msg *msg)
 {
 	struct nss_cmn_msg *ncm = &msg->cm;

 	/*
 	 * Trace Messages
 	 */
 	nss_map_t_log_tx_msg(msg);

 	/*
 	 * Sanity check the message
 	 */
 	if (!nss_map_t_verify_if_num(ncm->interface)) {
 		nss_warning("%px: tx request is not for a MAP-T dynamic interface: %d", nss_ctx, ncm->interface);
 		return NSS_TX_FAILURE;
 	}

 	if (ncm->type > NSS_MAP_T_MSG_MAX) {
 		nss_warning("%px: message type out of range: %d", nss_ctx, ncm->type);
 		return NSS_TX_FAILURE;
 	}

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

 /*
  * nss_map_t_tx_sync()
  *	Transmit a MAP-T message to NSS firmware synchronously.
  */
 nss_tx_status_t nss_map_t_tx_sync(struct nss_ctx_instance *nss_ctx, struct nss_map_t_msg *msg)
 {
 	nss_tx_status_t status;
 	int ret = 0;

 	down(&nss_map_t_pvt.sem);
 	nss_map_t_pvt.cb = (void *)msg->cm.cb;
 	nss_map_t_pvt.app_data = (void *)msg->cm.app_data;

 	msg->cm.cb = (nss_ptr_t)nss_map_t_callback;
 	msg->cm.app_data = (nss_ptr_t)NULL;

 	status = nss_map_t_tx(nss_ctx, msg);
 	if (status != NSS_TX_SUCCESS) {
 		nss_warning("%px: map_t_tx_msg failed\n", nss_ctx);
 		up(&nss_map_t_pvt.sem);
 		return status;
 	}
 	ret = wait_for_completion_timeout(&nss_map_t_pvt.complete, msecs_to_jiffies(NSS_MAP_T_TX_TIMEOUT));

 	if (!ret) {
 		nss_warning("%px: MAP-T tx sync failed due to timeout\n", nss_ctx);
 		nss_map_t_pvt.response = NSS_TX_FAILURE;
 	}

 	status = nss_map_t_pvt.response;
 	up(&nss_map_t_pvt.sem);
 	return status;
 }
 EXPORT_SYMBOL(nss_map_t_tx_sync);

 /*
  ***********************************
  * Register/Unregister/Miscellaneous APIs
  ***********************************
  */

 /*
  * nss_map_t_register_if()
  */
 struct nss_ctx_instance *nss_map_t_register_if(uint32_t if_num, uint32_t type, nss_map_t_callback_t map_t_callback,
 			nss_map_t_msg_callback_t event_callback, struct net_device *netdev, uint32_t features)
 {
 	struct nss_ctx_instance *nss_ctx = (struct nss_ctx_instance *)&nss_top_main.nss[nss_top_main.map_t_handler_id];
 	int i = 0;

 	nss_assert(nss_ctx);
 	nss_assert(nss_map_t_verify_if_num(if_num));

 	nss_core_register_subsys_dp(nss_ctx, if_num, map_t_callback, 0, netdev, netdev, features);
 	nss_ctx->subsys_dp_register[if_num].type = type;

 	nss_top_main.map_t_msg_callback = event_callback;

 	nss_core_register_handler(nss_ctx, if_num, nss_map_t_handler, NULL);

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

 	return nss_ctx;
 }
 EXPORT_SYMBOL(nss_map_t_register_if);

 /*
  * nss_map_t_unregister_if()
  */
 void nss_map_t_unregister_if(uint32_t if_num)
 {
 	struct nss_ctx_instance *nss_ctx = (struct nss_ctx_instance *)&nss_top_main.nss[nss_top_main.map_t_handler_id];
 	int i;

 	nss_assert(nss_ctx);
 	nss_assert(nss_map_t_verify_if_num(if_num));

 	nss_core_unregister_subsys_dp(nss_ctx, if_num);

 	nss_top_main.map_t_msg_callback = NULL;

 	nss_core_unregister_handler(nss_ctx, if_num);

 	spin_lock_bh(&nss_map_t_debug_stats_lock);
 	for (i = 0; i < NSS_MAX_MAP_T_DYNAMIC_INTERFACES; i++) {
 		if (nss_map_t_debug_stats[i].if_num == if_num) {
 			memset(&nss_map_t_debug_stats[i], 0, sizeof(struct nss_map_t_stats_instance_debug));
 			break;
 		}
 	}
 	spin_unlock_bh(&nss_map_t_debug_stats_lock);
 }
 EXPORT_SYMBOL(nss_map_t_unregister_if);

 /*
  * nss_get_map_t_context()
  */
 struct nss_ctx_instance *nss_map_t_get_context()
 {
 	return (struct nss_ctx_instance *)&nss_top_main.nss[nss_top_main.map_t_handler_id];
 }
 EXPORT_SYMBOL(nss_map_t_get_context);

 /*
  * nss_map_t_msg_init()
  *	Initialize nss_map_t msg.
  */
 void nss_map_t_msg_init(struct nss_map_t_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);
 }
 EXPORT_SYMBOL(nss_map_t_msg_init);

 /*
  * nss_map_t_register_handler()
  *	debugfs stats msg handler received on static map_t interface
  */
 void nss_map_t_register_handler(void)
 {
 	struct nss_ctx_instance *nss_ctx = nss_map_t_get_context();

 	nss_info("nss_map_t_register_handler");
 	sema_init(&nss_map_t_pvt.sem, 1);
 	init_completion(&nss_map_t_pvt.complete);
 	nss_core_register_handler(nss_ctx, NSS_MAP_T_INTERFACE, nss_map_t_handler, NULL);

 	nss_map_t_stats_dentry_create();
 	nss_map_t_strings_dentry_create();
 }
	/*
	**************************************************************************
	* Copyright (c) 2016-2020, 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_tx_rx_common.h"
	#include "nss_map_t_stats.h"
	#include "nss_map_t_log.h"
	#include "nss_map_t_strings.h"

	#define NSS_MAP_T_TX_TIMEOUT 3000 /* 3 Seconds */

	/*
	* Private data structure
	*/
	static struct {
	struct semaphore sem;
	struct completion complete;
	int response;
	void *cb;
	void *app_data;
	} nss_map_t_pvt;

	/*
	* Data structures to store map_t nss debug stats
	*/
	static DEFINE_SPINLOCK(nss_map_t_debug_stats_lock);
	static struct nss_map_t_stats_instance_debug nss_map_t_debug_stats[NSS_MAX_MAP_T_DYNAMIC_INTERFACES];

	/*
	* nss_map_t_verify_if_num()
	* Verify if_num passed to us.
	*/
	static bool nss_map_t_verify_if_num(uint32_t if_num)
	{
	enum nss_dynamic_interface_type if_type;

	if (nss_is_dynamic_interface(if_num) == false) {
	return false;
	}

	if_type = nss_dynamic_interface_get_type(nss_map_t_get_context(), if_num);
	switch (if_type) {
	case NSS_DYNAMIC_INTERFACE_TYPE_MAP_T_INNER:
	case NSS_DYNAMIC_INTERFACE_TYPE_MAP_T_OUTER:
	return true;

	default:
	return false;
	}
	}

	/*
	* nss_map_t_instance_debug_stats_sync
	* debug stats for map_t
	*/
	void nss_map_t_instance_debug_stats_sync(struct nss_ctx_instance nss_ctx, struct nss_map_t_sync_stats_msg stats_msg, uint16_t if_num)
	{
	int i;
	enum nss_dynamic_interface_type if_type;

	if_type = nss_dynamic_interface_get_type(nss_ctx, if_num);

	spin_lock_bh(&nss_map_t_debug_stats_lock);
	for (i = 0; i < NSS_MAX_MAP_T_DYNAMIC_INTERFACES; i++) {
	if (nss_map_t_debug_stats[i].if_num != if_num) {
	continue;
	}
	switch (if_type) {
	case NSS_DYNAMIC_INTERFACE_TYPE_MAP_T_INNER:
	nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V4_TO_V6_PBUF_EXCEPTION] +=
	stats_msg->debug_stats.v4_to_v6.exception_pkts;
	nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V4_TO_V6_PBUF_NO_MATCHING_RULE] +=
	stats_msg->debug_stats.v4_to_v6.no_matching_rule;
	nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V4_TO_V6_PBUF_NOT_TCP_OR_UDP] +=
	stats_msg->debug_stats.v4_to_v6.not_tcp_or_udp;
	nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V4_TO_V6_RULE_ERR_LOCAL_PSID] +=
	stats_msg->debug_stats.v4_to_v6.rule_err_local_psid;
	nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V4_TO_V6_RULE_ERR_LOCAL_IPV6] +=
	stats_msg->debug_stats.v4_to_v6.rule_err_local_ipv6;
	nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V4_TO_V6_RULE_ERR_REMOTE_PSID] +=
	stats_msg->debug_stats.v4_to_v6.rule_err_remote_psid;
	nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V4_TO_V6_RULE_ERR_REMOTE_EA_BITS] +=
	stats_msg->debug_stats.v4_to_v6.rule_err_remote_ea_bits;
	nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V4_TO_V6_RULE_ERR_REMOTE_IPV6] +=
	stats_msg->debug_stats.v4_to_v6.rule_err_remote_ipv6;
	break;

	case NSS_DYNAMIC_INTERFACE_TYPE_MAP_T_OUTER:
	nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V6_TO_V4_PBUF_EXCEPTION] +=
	stats_msg->debug_stats.v6_to_v4.exception_pkts;
	nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V6_TO_V4_PBUF_NO_MATCHING_RULE] +=
	stats_msg->debug_stats.v6_to_v4.no_matching_rule;
	nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V6_TO_V4_PBUF_NOT_TCP_OR_UDP] +=
	stats_msg->debug_stats.v6_to_v4.not_tcp_or_udp;
	nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V6_TO_V4_RULE_ERR_LOCAL_IPV4] +=
	stats_msg->debug_stats.v6_to_v4.rule_err_local_ipv4;
	nss_map_t_debug_stats[i].stats[NSS_MAP_T_STATS_V6_TO_V4_RULE_ERR_REMOTE_IPV4] +=
	stats_msg->debug_stats.v6_to_v4.rule_err_remote_ipv4;
	break;

	default:
	nss_warning("Invalid MAP-T interface encountered: %u\n", if_type);
	break;
	}
	}
	spin_unlock_bh(&nss_map_t_debug_stats_lock);
	}

	/*
	* nss_map_t_instance_debug_stats_get()
	* Get map_t statitics.
	*/
	void nss_map_t_instance_debug_stats_get(void *stats_mem)
	{
	struct nss_map_t_stats_instance_debug stats = (struct nss_map_t_stats_instance_debug )stats_mem;
	int i;

	if (!stats) {
	nss_warning("No memory to copy map_t stats");
	return;
	}

	spin_lock_bh(&nss_map_t_debug_stats_lock);
	for (i = 0; i < NSS_MAX_MAP_T_DYNAMIC_INTERFACES; i++) {
	if (nss_map_t_debug_stats[i].valid) {
	memcpy(stats, &nss_map_t_debug_stats[i], sizeof(struct nss_map_t_stats_instance_debug));
	stats++;
	}
	}
	spin_unlock_bh(&nss_map_t_debug_stats_lock);
	}

	/*
	* nss_map_t_handler()
	* Handle NSS -> HLOS messages for map_t tunnel
	*/
	static void nss_map_t_handler(struct nss_ctx_instance nss_ctx, struct nss_cmn_msg ncm, __attribute__((unused))void *app_data)
	{
	struct nss_map_t_msg ntm = (struct nss_map_t_msg )ncm;
	void *ctx;

	nss_map_t_msg_callback_t cb;

	NSS_VERIFY_CTX_MAGIC(nss_ctx);
	BUG_ON(!nss_map_t_verify_if_num(ncm->interface));

	/*
	* Trace Messages
	*/
	nss_map_t_log_rx_msg(ntm);

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

	if (nss_cmn_get_msg_len(ncm) > sizeof(struct nss_map_t_msg)) {
	nss_warning("%px: tx request for another interface: %d", nss_ctx, ncm->interface);
	return;
	}

	switch (ntm->cm.type) {
	case NSS_MAP_T_MSG_SYNC_STATS:
	/*
	* Update debug stats in stats msg and send statistics notifications to the registered modules
	*/
	nss_map_t_instance_debug_stats_sync(nss_ctx, &ntm->msg.stats, ncm->interface);
	nss_map_t_stats_notify(nss_ctx, ncm->interface);
	break;
	}

	/*
	* Update the callback and app_data for NOTIFY messages, map_t sends all notify messages
	* to the same callback/app_data.
	*/
	if (ncm->response == NSS_CMN_RESPONSE_NOTIFY) {
	ncm->cb = (nss_ptr_t)nss_ctx->nss_top->map_t_msg_callback;
	ncm->app_data = (nss_ptr_t)nss_ctx->subsys_dp_register[ncm->interface].app_data;
	}

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

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

	/*
	* call map-t callback
	*/
	if (!cb) {
	nss_warning("%px: No callback for map-t interface %d",
	nss_ctx, ncm->interface);
	return;
	}

	cb(ctx, ntm);
	}

	/*
	* nss_map_t_callback()
	* Callback to handle the completion of NSS->HLOS messages.
	*/
	static void nss_map_t_callback(void app_data, struct nss_map_t_msg nim)
	{
	nss_map_t_msg_callback_t callback = (nss_map_t_msg_callback_t)nss_map_t_pvt.cb;
	void *data = nss_map_t_pvt.app_data;

	nss_map_t_pvt.cb = NULL;
	nss_map_t_pvt.app_data = NULL;

	if (nim->cm.response != NSS_CMN_RESPONSE_ACK) {
	nss_warning("map_t Error response %d\n", nim->cm.response);
	nss_map_t_pvt.response = NSS_TX_FAILURE;
	} else {
	nss_map_t_pvt.response = NSS_TX_SUCCESS;
	}

	if (callback) {
	callback(data, nim);
	}

	complete(&nss_map_t_pvt.complete);
	}

	/*
	* nss_map_t_tx()
	* Transmit a map_t message to NSS firmware
	*/
	nss_tx_status_t nss_map_t_tx(struct nss_ctx_instance nss_ctx, struct nss_map_t_msg msg)
	{
	struct nss_cmn_msg *ncm = &msg->cm;

	/*
	* Trace Messages
	*/
	nss_map_t_log_tx_msg(msg);

	/*
	* Sanity check the message
	*/
	if (!nss_map_t_verify_if_num(ncm->interface)) {
	nss_warning("%px: tx request is not for a MAP-T dynamic interface: %d", nss_ctx, ncm->interface);
	return NSS_TX_FAILURE;
	}

	if (ncm->type > NSS_MAP_T_MSG_MAX) {
	nss_warning("%px: message type out of range: %d", nss_ctx, ncm->type);
	return NSS_TX_FAILURE;
	}

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

	/*
	* nss_map_t_tx_sync()
	* Transmit a MAP-T message to NSS firmware synchronously.
	*/
	nss_tx_status_t nss_map_t_tx_sync(struct nss_ctx_instance nss_ctx, struct nss_map_t_msg msg)
	{
	nss_tx_status_t status;
	int ret = 0;

	down(&nss_map_t_pvt.sem);
	nss_map_t_pvt.cb = (void *)msg->cm.cb;
	nss_map_t_pvt.app_data = (void *)msg->cm.app_data;

	msg->cm.cb = (nss_ptr_t)nss_map_t_callback;
	msg->cm.app_data = (nss_ptr_t)NULL;

	status = nss_map_t_tx(nss_ctx, msg);
	if (status != NSS_TX_SUCCESS) {
	nss_warning("%px: map_t_tx_msg failed\n", nss_ctx);
	up(&nss_map_t_pvt.sem);
	return status;
	}
	ret = wait_for_completion_timeout(&nss_map_t_pvt.complete, msecs_to_jiffies(NSS_MAP_T_TX_TIMEOUT));

	if (!ret) {
	nss_warning("%px: MAP-T tx sync failed due to timeout\n", nss_ctx);
	nss_map_t_pvt.response = NSS_TX_FAILURE;
	}

	status = nss_map_t_pvt.response;
	up(&nss_map_t_pvt.sem);
	return status;
	}
	EXPORT_SYMBOL(nss_map_t_tx_sync);

	/*
	***********************************
	* Register/Unregister/Miscellaneous APIs
	***********************************
	*/

	/*
	* nss_map_t_register_if()
	*/
	struct nss_ctx_instance *nss_map_t_register_if(uint32_t if_num, uint32_t type, nss_map_t_callback_t map_t_callback,
	nss_map_t_msg_callback_t event_callback, struct net_device *netdev, uint32_t features)
	{
	struct nss_ctx_instance nss_ctx = (struct nss_ctx_instance )&nss_top_main.nss[nss_top_main.map_t_handler_id];
	int i = 0;

	nss_assert(nss_ctx);
	nss_assert(nss_map_t_verify_if_num(if_num));

	nss_core_register_subsys_dp(nss_ctx, if_num, map_t_callback, 0, netdev, netdev, features);
	nss_ctx->subsys_dp_register[if_num].type = type;

	nss_top_main.map_t_msg_callback = event_callback;

	nss_core_register_handler(nss_ctx, if_num, nss_map_t_handler, NULL);

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

	return nss_ctx;
	}
	EXPORT_SYMBOL(nss_map_t_register_if);

	/*
	* nss_map_t_unregister_if()
	*/
	void nss_map_t_unregister_if(uint32_t if_num)
	{
	struct nss_ctx_instance nss_ctx = (struct nss_ctx_instance )&nss_top_main.nss[nss_top_main.map_t_handler_id];
	int i;

	nss_assert(nss_ctx);
	nss_assert(nss_map_t_verify_if_num(if_num));

	nss_core_unregister_subsys_dp(nss_ctx, if_num);

	nss_top_main.map_t_msg_callback = NULL;

	nss_core_unregister_handler(nss_ctx, if_num);

	spin_lock_bh(&nss_map_t_debug_stats_lock);
	for (i = 0; i < NSS_MAX_MAP_T_DYNAMIC_INTERFACES; i++) {
	if (nss_map_t_debug_stats[i].if_num == if_num) {
	memset(&nss_map_t_debug_stats[i], 0, sizeof(struct nss_map_t_stats_instance_debug));
	break;
	}
	}
	spin_unlock_bh(&nss_map_t_debug_stats_lock);
	}
	EXPORT_SYMBOL(nss_map_t_unregister_if);

	/*
	* nss_get_map_t_context()
	*/
	struct nss_ctx_instance *nss_map_t_get_context()
	{
	return (struct nss_ctx_instance *)&nss_top_main.nss[nss_top_main.map_t_handler_id];
	}
	EXPORT_SYMBOL(nss_map_t_get_context);

	/*
	* nss_map_t_msg_init()
	* Initialize nss_map_t msg.
	*/
	void nss_map_t_msg_init(struct nss_map_t_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);
	}
	EXPORT_SYMBOL(nss_map_t_msg_init);

	/*
	* nss_map_t_register_handler()
	* debugfs stats msg handler received on static map_t interface
	*/
	void nss_map_t_register_handler(void)
	{
	struct nss_ctx_instance *nss_ctx = nss_map_t_get_context();

	nss_info("nss_map_t_register_handler");
	sema_init(&nss_map_t_pvt.sem, 1);
	init_completion(&nss_map_t_pvt.complete);
	nss_core_register_handler(nss_ctx, NSS_MAP_T_INTERFACE, nss_map_t_handler, NULL);

	nss_map_t_stats_dentry_create();
	nss_map_t_strings_dentry_create();
	}