nss_ipv6.c - codeaurora/quic/qsdk/oss/lklm/nss-drv - Gitiles

 /*
  **************************************************************************
  * Copyright (c) 2014, 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_ipv6.c
  *	NSS IPv6 APIs
  */
 #include <linux/ppp_channel.h>
 #include "nss_tx_rx_common.h"

 extern void nss_rx_metadata_ipv6_rule_establish(struct nss_ctx_instance *nss_ctx, struct nss_ipv6_rule_establish *nire);
 extern void nss_rx_ipv6_sync(struct nss_ctx_instance *nss_ctx, struct nss_ipv6_conn_sync *nirs);

 /*
  * nss_ipv6_driver_conn_sync_update()
  *	Update driver specific information from the messsage.
  */
 static void nss_ipv6_driver_conn_sync_update(struct nss_ctx_instance *nss_ctx, struct nss_ipv6_conn_sync *nics)
 {
 	struct nss_top_instance *nss_top = nss_ctx->nss_top;
 	struct net_device *pppoe_dev = NULL;

 	/*
 	 * Update statistics maintained by NSS driver
 	 */
 	spin_lock_bh(&nss_top->stats_lock);
 	nss_top->stats_ipv6[NSS_STATS_IPV6_ACCELERATED_RX_PKTS] += nics->flow_rx_packet_count + nics->return_rx_packet_count;
 	nss_top->stats_ipv6[NSS_STATS_IPV6_ACCELERATED_RX_BYTES] += nics->flow_rx_byte_count + nics->return_rx_byte_count;
 	nss_top->stats_ipv6[NSS_STATS_IPV6_ACCELERATED_TX_PKTS] += nics->flow_tx_packet_count + nics->return_tx_packet_count;
 	nss_top->stats_ipv6[NSS_STATS_IPV6_ACCELERATED_TX_BYTES] += nics->flow_tx_byte_count + nics->return_tx_byte_count;
 	spin_unlock_bh(&nss_top->stats_lock);

 	/*
 	 * Update the PPPoE interface stats, if there is any PPPoE session on the interfaces.
 	 */
 	if (nics->flow_pppoe_session_id) {
 		pppoe_dev = ppp_session_to_netdev(nics->flow_pppoe_session_id, (uint8_t *)nics->flow_pppoe_remote_mac);
 		if (pppoe_dev) {
 			ppp_update_stats(pppoe_dev, nics->flow_rx_packet_count, nics->flow_rx_byte_count,
 					nics->flow_tx_packet_count, nics->flow_tx_byte_count);
 			dev_put(pppoe_dev);
 		}
 	}

 	if (nics->return_pppoe_session_id) {
 		pppoe_dev = ppp_session_to_netdev(nics->return_pppoe_session_id, (uint8_t *)nics->return_pppoe_remote_mac);
 		if (pppoe_dev) {
 			ppp_update_stats(pppoe_dev, nics->return_rx_packet_count, nics->return_rx_byte_count,
 				nics->return_tx_packet_count, nics->return_tx_byte_count);
 			dev_put(pppoe_dev);
 		}
 	}

 }

 /*
  * nss_ipv6_driver_node_sync_update)
  *	Update driver specific information from the messsage.
  */
 static void nss_ipv6_driver_node_sync_update(struct nss_ctx_instance *nss_ctx, struct nss_ipv6_node_sync *nins)
 {
 	struct nss_top_instance *nss_top = nss_ctx->nss_top;
 	uint32_t i;

 	/*
 	 * Update statistics maintained by NSS driver
 	 */
 	spin_lock_bh(&nss_top->stats_lock);
 	nss_top->stats_node[NSS_IPV6_RX_INTERFACE][NSS_STATS_NODE_RX_PKTS] += nins->node_stats.rx_packets;
 	nss_top->stats_node[NSS_IPV6_RX_INTERFACE][NSS_STATS_NODE_RX_BYTES] += nins->node_stats.rx_bytes;
 	nss_top->stats_node[NSS_IPV6_RX_INTERFACE][NSS_STATS_NODE_RX_DROPPED] += nins->node_stats.rx_dropped;
 	nss_top->stats_node[NSS_IPV6_RX_INTERFACE][NSS_STATS_NODE_TX_PKTS] += nins->node_stats.tx_packets;
 	nss_top->stats_node[NSS_IPV6_RX_INTERFACE][NSS_STATS_NODE_TX_BYTES] += nins->node_stats.tx_bytes;

 	nss_top->stats_ipv6[NSS_STATS_IPV6_CONNECTION_CREATE_REQUESTS] += nins->ipv6_connection_create_requests;
 	nss_top->stats_ipv6[NSS_STATS_IPV6_CONNECTION_CREATE_COLLISIONS] += nins->ipv6_connection_create_collisions;
 	nss_top->stats_ipv6[NSS_STATS_IPV6_CONNECTION_CREATE_INVALID_INTERFACE] += nins->ipv6_connection_create_invalid_interface;
 	nss_top->stats_ipv6[NSS_STATS_IPV6_CONNECTION_DESTROY_REQUESTS] += nins->ipv6_connection_destroy_requests;
 	nss_top->stats_ipv6[NSS_STATS_IPV6_CONNECTION_DESTROY_MISSES] += nins->ipv6_connection_destroy_misses;
 	nss_top->stats_ipv6[NSS_STATS_IPV6_CONNECTION_HASH_HITS] += nins->ipv6_connection_hash_hits;
 	nss_top->stats_ipv6[NSS_STATS_IPV6_CONNECTION_HASH_REORDERS] += nins->ipv6_connection_hash_reorders;
 	nss_top->stats_ipv6[NSS_STATS_IPV6_CONNECTION_FLUSHES] += nins->ipv6_connection_flushes;
 	nss_top->stats_ipv6[NSS_STATS_IPV6_CONNECTION_EVICTIONS] += nins->ipv6_connection_evictions;

 	for (i = 0; i < NSS_EXCEPTION_EVENT_IPV6_MAX; i++) {
 		 nss_top->stats_if_exception_ipv6[i] += nins->exception_events[i];
 	}
 	spin_unlock_bh(&nss_top->stats_lock);
 }

 /*
  * nss_ipv6_rx_msg_handler()
  *	Handle NSS -> HLOS messages for IPv6 bridge/route
  */
 static void nss_ipv6_rx_msg_handler(struct nss_ctx_instance *nss_ctx, struct nss_cmn_msg *ncm, __attribute__((unused))void *app_data)
 {
 	struct nss_ipv6_msg *nim = (struct nss_ipv6_msg *)ncm;
 	nss_ipv6_msg_callback_t cb;

 	BUG_ON(ncm->interface != NSS_IPV6_RX_INTERFACE);

 	/*
 	 * Is this a valid request/response packet?
 	 */
 	if (nim->cm.type >= NSS_IPV6_MAX_MSG_TYPES) {
 		nss_warning("%p: received invalid message %d for IPv6 interface", nss_ctx, nim->cm.type);
 		return;
 	}

 	if (ncm->len > sizeof(struct nss_ipv6_msg)) {
 		nss_warning("%p: tx request for another interface: %d", nss_ctx, ncm->interface);
 		return;
 	}

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

 	/*
 	 * Handle deprecated messages.  Eventually these messages should be removed.
 	 */
 	switch (nim->cm.type) {
 	case NSS_IPV6_RX_ESTABLISH_RULE_MSG:
 		nss_rx_metadata_ipv6_rule_establish(nss_ctx, &nim->msg.rule_establish);
 		break;

 	case NSS_IPV6_RX_NODE_STATS_SYNC_MSG:
 		/*
 		* Update driver statistics on node sync.
 		*/
 		nss_ipv6_driver_node_sync_update(nss_ctx, &nim->msg.node_stats);
 		break;

 	case NSS_IPV6_RX_CONN_STATS_SYNC_MSG:
 		/*
 		 * Update driver statistics on connection sync.
 		 */
 		nss_ipv6_driver_conn_sync_update(nss_ctx, &nim->msg.conn_stats);
 		return nss_rx_ipv6_sync(nss_ctx, &nim->msg.conn_stats);
 		break;
 	}

 	/*
 	 * Update the callback and app_data for NOTIFY messages, IPv6 sends all notify messages
 	 * to the same callback/app_data.
 	 */
 	if (nim->cm.response == NSS_CMM_RESPONSE_NOTIFY) {
 		ncm->cb = (uint32_t)nss_ctx->nss_top->ipv6_callback;
 		ncm->app_data = (uint32_t)nss_ctx->nss_top->ipv6_ctx;
 	}

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

 	/*
 	 * Callback
 	 */
 	cb = (nss_ipv6_msg_callback_t)ncm->cb;
 	cb((void *)ncm->app_data, nim);
 }

 /*
  * nss_ipv6_tx()
  *	Transmit an ipv6 message to the FW.
  */
 nss_tx_status_t nss_ipv6_tx(struct nss_ctx_instance *nss_ctx, struct nss_ipv6_msg *nim)
 {
 	struct nss_ipv6_msg *nim2;
 	struct nss_cmn_msg *ncm = &nim->cm;
 	struct sk_buff *nbuf;
 	int32_t status;

 	NSS_VERIFY_CTX_MAGIC(nss_ctx);
 	if (unlikely(nss_ctx->state != NSS_CORE_STATE_INITIALIZED)) {
 		nss_warning("%p: ipv6 msg dropped as core not ready", nss_ctx);
 		return NSS_TX_FAILURE_NOT_READY;
 	}

 	/*
 	 * Sanity check the message
 	 */
 	if (ncm->interface != NSS_IPV6_RX_INTERFACE) {
 		nss_warning("%p: tx request for another interface: %d", nss_ctx, ncm->interface);
 		return NSS_TX_FAILURE;
 	}

 	if (ncm->type > NSS_IPV6_MAX_MSG_TYPES) {
 		nss_warning("%p: message type out of range: %d", nss_ctx, ncm->type);
 		return NSS_TX_FAILURE;
 	}

 	if (ncm->len > sizeof(struct nss_ipv6_msg)) {
 		nss_warning("%p: tx request for another interface: %d", nss_ctx, ncm->interface);
 		return NSS_TX_FAILURE;
 	}

 	nbuf = dev_alloc_skb(NSS_NBUF_PAYLOAD_SIZE);
 	if (unlikely(!nbuf)) {
 		spin_lock_bh(&nss_ctx->nss_top->stats_lock);
 		nss_ctx->nss_top->stats_drv[NSS_STATS_DRV_NBUF_ALLOC_FAILS]++;
 		spin_unlock_bh(&nss_ctx->nss_top->stats_lock);
 		nss_warning("%p: msg dropped as command allocation failed", nss_ctx);
 		return NSS_TX_FAILURE;
 	}

 	/*
 	 * Copy the message to our skb.
 	 */
 	nim2 = (struct nss_ipv6_msg *)skb_put(nbuf, sizeof(struct nss_ipv6_msg));
 	memcpy(nim2, nim, sizeof(struct nss_ipv6_msg));

 	status = nss_core_send_buffer(nss_ctx, 0, nbuf, NSS_IF_CMD_QUEUE, H2N_BUFFER_CTRL, 0);
 	if (status != NSS_CORE_STATUS_SUCCESS) {
 		dev_kfree_skb_any(nbuf);
 		nss_warning("%p: Unable to enqueue 'Destroy IPv6' rule\n", nss_ctx);
 		return NSS_TX_FAILURE;
 	}

 	nss_hal_send_interrupt(nss_ctx->nmap, nss_ctx->h2n_desc_rings[NSS_IF_CMD_QUEUE].desc_ring.int_bit,
 								NSS_REGS_H2N_INTR_STATUS_DATA_COMMAND_QUEUE);

 	NSS_PKT_STATS_INCREMENT(nss_ctx, &nss_ctx->nss_top->stats_drv[NSS_STATS_DRV_TX_CMD_REQ]);
 	return NSS_TX_SUCCESS;
 }

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

 /*
  * nss_ipv6_notify_register()
  *	Register to received IPv6 events.
  *
  * NOTE: Do we want to pass an nss_ctx here so that we can register for ipv6 on any core?
  */
 struct nss_ctx_instance *nss_ipv6_notify_register(nss_ipv6_msg_callback_t cb, void *app_data)
 {
 	/*
 	 * TODO: We need to have a new array in support of the new API
 	 * TODO: If we use a per-context array, we would move the array into nss_ctx based.
 	 */
 	nss_top_main.ipv6_callback = cb;
 	nss_top_main.ipv6_ctx = app_data;
 	return &nss_top_main.nss[nss_top_main.ipv6_handler_id];
 }

 /*
  * nss_ipv6_notify_unregister()
  *	Unregister to received IPv6 events.
  *
  * NOTE: Do we want to pass an nss_ctx here so that we can register for ipv6 on any core?
  */
 void nss_ipv6_notify_unregister(void)
 {
 	nss_top_main.ipv6_callback = NULL;
 }

 /*
  * nss_ipv6_get_mgr()
  *
  * TODO: This only suppports a single ipv6, do we ever want to support more?
  */
 struct nss_ctx_instance *nss_ipv6_get_mgr(void)
 {
 	return (void *)&nss_top_main.nss[nss_top_main.ipv6_handler_id];
 }

 /*
  * nss_ipv6_register_handler()
  *	Register our handler to receive messages for this interface
  */
 void nss_ipv6_register_handler()
 {
 	if (nss_core_register_handler(NSS_IPV6_RX_INTERFACE, nss_ipv6_rx_msg_handler, NULL) != NSS_CORE_STATUS_SUCCESS) {
 		nss_warning("IPv6 handler failed to register");
 	}
 }

 EXPORT_SYMBOL(nss_ipv6_tx);
 EXPORT_SYMBOL(nss_ipv6_notify_register);
 EXPORT_SYMBOL(nss_ipv6_notify_unregister);
 EXPORT_SYMBOL(nss_ipv6_get_mgr);
 EXPORT_SYMBOL(nss_ipv6_register_handler);
	/*
	**************************************************************************
	* Copyright (c) 2014, 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_ipv6.c
	* NSS IPv6 APIs
	*/
	#include <linux/ppp_channel.h>
	#include "nss_tx_rx_common.h"

	extern void nss_rx_metadata_ipv6_rule_establish(struct nss_ctx_instance nss_ctx, struct nss_ipv6_rule_establish nire);
	extern void nss_rx_ipv6_sync(struct nss_ctx_instance nss_ctx, struct nss_ipv6_conn_sync nirs);

	/*
	* nss_ipv6_driver_conn_sync_update()
	* Update driver specific information from the messsage.
	*/
	static void nss_ipv6_driver_conn_sync_update(struct nss_ctx_instance nss_ctx, struct nss_ipv6_conn_sync nics)
	{
	struct nss_top_instance *nss_top = nss_ctx->nss_top;
	struct net_device *pppoe_dev = NULL;

	/*
	* Update statistics maintained by NSS driver
	*/
	spin_lock_bh(&nss_top->stats_lock);
	nss_top->stats_ipv6[NSS_STATS_IPV6_ACCELERATED_RX_PKTS] += nics->flow_rx_packet_count + nics->return_rx_packet_count;
	nss_top->stats_ipv6[NSS_STATS_IPV6_ACCELERATED_RX_BYTES] += nics->flow_rx_byte_count + nics->return_rx_byte_count;
	nss_top->stats_ipv6[NSS_STATS_IPV6_ACCELERATED_TX_PKTS] += nics->flow_tx_packet_count + nics->return_tx_packet_count;
	nss_top->stats_ipv6[NSS_STATS_IPV6_ACCELERATED_TX_BYTES] += nics->flow_tx_byte_count + nics->return_tx_byte_count;
	spin_unlock_bh(&nss_top->stats_lock);

	/*
	* Update the PPPoE interface stats, if there is any PPPoE session on the interfaces.
	*/
	if (nics->flow_pppoe_session_id) {
	pppoe_dev = ppp_session_to_netdev(nics->flow_pppoe_session_id, (uint8_t *)nics->flow_pppoe_remote_mac);
	if (pppoe_dev) {
	ppp_update_stats(pppoe_dev, nics->flow_rx_packet_count, nics->flow_rx_byte_count,
	nics->flow_tx_packet_count, nics->flow_tx_byte_count);
	dev_put(pppoe_dev);
	}
	}

	if (nics->return_pppoe_session_id) {
	pppoe_dev = ppp_session_to_netdev(nics->return_pppoe_session_id, (uint8_t *)nics->return_pppoe_remote_mac);
	if (pppoe_dev) {
	ppp_update_stats(pppoe_dev, nics->return_rx_packet_count, nics->return_rx_byte_count,
	nics->return_tx_packet_count, nics->return_tx_byte_count);
	dev_put(pppoe_dev);
	}
	}

	}

	/*
	* nss_ipv6_driver_node_sync_update)
	* Update driver specific information from the messsage.
	*/
	static void nss_ipv6_driver_node_sync_update(struct nss_ctx_instance nss_ctx, struct nss_ipv6_node_sync nins)
	{
	struct nss_top_instance *nss_top = nss_ctx->nss_top;
	uint32_t i;

	/*
	* Update statistics maintained by NSS driver
	*/
	spin_lock_bh(&nss_top->stats_lock);
	nss_top->stats_node[NSS_IPV6_RX_INTERFACE][NSS_STATS_NODE_RX_PKTS] += nins->node_stats.rx_packets;
	nss_top->stats_node[NSS_IPV6_RX_INTERFACE][NSS_STATS_NODE_RX_BYTES] += nins->node_stats.rx_bytes;
	nss_top->stats_node[NSS_IPV6_RX_INTERFACE][NSS_STATS_NODE_RX_DROPPED] += nins->node_stats.rx_dropped;
	nss_top->stats_node[NSS_IPV6_RX_INTERFACE][NSS_STATS_NODE_TX_PKTS] += nins->node_stats.tx_packets;
	nss_top->stats_node[NSS_IPV6_RX_INTERFACE][NSS_STATS_NODE_TX_BYTES] += nins->node_stats.tx_bytes;

	nss_top->stats_ipv6[NSS_STATS_IPV6_CONNECTION_CREATE_REQUESTS] += nins->ipv6_connection_create_requests;
	nss_top->stats_ipv6[NSS_STATS_IPV6_CONNECTION_CREATE_COLLISIONS] += nins->ipv6_connection_create_collisions;
	nss_top->stats_ipv6[NSS_STATS_IPV6_CONNECTION_CREATE_INVALID_INTERFACE] += nins->ipv6_connection_create_invalid_interface;
	nss_top->stats_ipv6[NSS_STATS_IPV6_CONNECTION_DESTROY_REQUESTS] += nins->ipv6_connection_destroy_requests;
	nss_top->stats_ipv6[NSS_STATS_IPV6_CONNECTION_DESTROY_MISSES] += nins->ipv6_connection_destroy_misses;
	nss_top->stats_ipv6[NSS_STATS_IPV6_CONNECTION_HASH_HITS] += nins->ipv6_connection_hash_hits;
	nss_top->stats_ipv6[NSS_STATS_IPV6_CONNECTION_HASH_REORDERS] += nins->ipv6_connection_hash_reorders;
	nss_top->stats_ipv6[NSS_STATS_IPV6_CONNECTION_FLUSHES] += nins->ipv6_connection_flushes;
	nss_top->stats_ipv6[NSS_STATS_IPV6_CONNECTION_EVICTIONS] += nins->ipv6_connection_evictions;

	for (i = 0; i < NSS_EXCEPTION_EVENT_IPV6_MAX; i++) {
	nss_top->stats_if_exception_ipv6[i] += nins->exception_events[i];
	}
	spin_unlock_bh(&nss_top->stats_lock);
	}

	/*
	* nss_ipv6_rx_msg_handler()
	* Handle NSS -> HLOS messages for IPv6 bridge/route
	*/
	static void nss_ipv6_rx_msg_handler(struct nss_ctx_instance nss_ctx, struct nss_cmn_msg ncm, __attribute__((unused))void *app_data)
	{
	struct nss_ipv6_msg nim = (struct nss_ipv6_msg )ncm;
	nss_ipv6_msg_callback_t cb;

	BUG_ON(ncm->interface != NSS_IPV6_RX_INTERFACE);

	/*
	* Is this a valid request/response packet?
	*/
	if (nim->cm.type >= NSS_IPV6_MAX_MSG_TYPES) {
	nss_warning("%p: received invalid message %d for IPv6 interface", nss_ctx, nim->cm.type);
	return;
	}

	if (ncm->len > sizeof(struct nss_ipv6_msg)) {
	nss_warning("%p: tx request for another interface: %d", nss_ctx, ncm->interface);
	return;
	}

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

	/*
	* Handle deprecated messages. Eventually these messages should be removed.
	*/
	switch (nim->cm.type) {
	case NSS_IPV6_RX_ESTABLISH_RULE_MSG:
	nss_rx_metadata_ipv6_rule_establish(nss_ctx, &nim->msg.rule_establish);
	break;

	case NSS_IPV6_RX_NODE_STATS_SYNC_MSG:
	/*
	* Update driver statistics on node sync.
	*/
	nss_ipv6_driver_node_sync_update(nss_ctx, &nim->msg.node_stats);
	break;

	case NSS_IPV6_RX_CONN_STATS_SYNC_MSG:
	/*
	* Update driver statistics on connection sync.
	*/
	nss_ipv6_driver_conn_sync_update(nss_ctx, &nim->msg.conn_stats);
	return nss_rx_ipv6_sync(nss_ctx, &nim->msg.conn_stats);
	break;
	}

	/*
	* Update the callback and app_data for NOTIFY messages, IPv6 sends all notify messages
	* to the same callback/app_data.
	*/
	if (nim->cm.response == NSS_CMM_RESPONSE_NOTIFY) {
	ncm->cb = (uint32_t)nss_ctx->nss_top->ipv6_callback;
	ncm->app_data = (uint32_t)nss_ctx->nss_top->ipv6_ctx;
	}

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

	/*
	* Callback
	*/
	cb = (nss_ipv6_msg_callback_t)ncm->cb;
	cb((void *)ncm->app_data, nim);
	}

	/*
	* nss_ipv6_tx()
	* Transmit an ipv6 message to the FW.
	*/
	nss_tx_status_t nss_ipv6_tx(struct nss_ctx_instance nss_ctx, struct nss_ipv6_msg nim)
	{
	struct nss_ipv6_msg *nim2;
	struct nss_cmn_msg *ncm = &nim->cm;
	struct sk_buff *nbuf;
	int32_t status;

	NSS_VERIFY_CTX_MAGIC(nss_ctx);
	if (unlikely(nss_ctx->state != NSS_CORE_STATE_INITIALIZED)) {
	nss_warning("%p: ipv6 msg dropped as core not ready", nss_ctx);
	return NSS_TX_FAILURE_NOT_READY;
	}

	/*
	* Sanity check the message
	*/
	if (ncm->interface != NSS_IPV6_RX_INTERFACE) {
	nss_warning("%p: tx request for another interface: %d", nss_ctx, ncm->interface);
	return NSS_TX_FAILURE;
	}

	if (ncm->type > NSS_IPV6_MAX_MSG_TYPES) {
	nss_warning("%p: message type out of range: %d", nss_ctx, ncm->type);
	return NSS_TX_FAILURE;
	}

	if (ncm->len > sizeof(struct nss_ipv6_msg)) {
	nss_warning("%p: tx request for another interface: %d", nss_ctx, ncm->interface);
	return NSS_TX_FAILURE;
	}

	nbuf = dev_alloc_skb(NSS_NBUF_PAYLOAD_SIZE);
	if (unlikely(!nbuf)) {
	spin_lock_bh(&nss_ctx->nss_top->stats_lock);
	nss_ctx->nss_top->stats_drv[NSS_STATS_DRV_NBUF_ALLOC_FAILS]++;
	spin_unlock_bh(&nss_ctx->nss_top->stats_lock);
	nss_warning("%p: msg dropped as command allocation failed", nss_ctx);
	return NSS_TX_FAILURE;
	}

	/*
	* Copy the message to our skb.
	*/
	nim2 = (struct nss_ipv6_msg *)skb_put(nbuf, sizeof(struct nss_ipv6_msg));
	memcpy(nim2, nim, sizeof(struct nss_ipv6_msg));

	status = nss_core_send_buffer(nss_ctx, 0, nbuf, NSS_IF_CMD_QUEUE, H2N_BUFFER_CTRL, 0);
	if (status != NSS_CORE_STATUS_SUCCESS) {
	dev_kfree_skb_any(nbuf);
	nss_warning("%p: Unable to enqueue 'Destroy IPv6' rule\n", nss_ctx);
	return NSS_TX_FAILURE;
	}

	nss_hal_send_interrupt(nss_ctx->nmap, nss_ctx->h2n_desc_rings[NSS_IF_CMD_QUEUE].desc_ring.int_bit,
	NSS_REGS_H2N_INTR_STATUS_DATA_COMMAND_QUEUE);

	NSS_PKT_STATS_INCREMENT(nss_ctx, &nss_ctx->nss_top->stats_drv[NSS_STATS_DRV_TX_CMD_REQ]);
	return NSS_TX_SUCCESS;
	}

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

	/*
	* nss_ipv6_notify_register()
	* Register to received IPv6 events.
	*
	* NOTE: Do we want to pass an nss_ctx here so that we can register for ipv6 on any core?
	*/
	struct nss_ctx_instance nss_ipv6_notify_register(nss_ipv6_msg_callback_t cb, void app_data)
	{
	/*
	* TODO: We need to have a new array in support of the new API
	* TODO: If we use a per-context array, we would move the array into nss_ctx based.
	*/
	nss_top_main.ipv6_callback = cb;
	nss_top_main.ipv6_ctx = app_data;
	return &nss_top_main.nss[nss_top_main.ipv6_handler_id];
	}

	/*
	* nss_ipv6_notify_unregister()
	* Unregister to received IPv6 events.
	*
	* NOTE: Do we want to pass an nss_ctx here so that we can register for ipv6 on any core?
	*/
	void nss_ipv6_notify_unregister(void)
	{
	nss_top_main.ipv6_callback = NULL;
	}

	/*
	* nss_ipv6_get_mgr()
	*
	* TODO: This only suppports a single ipv6, do we ever want to support more?
	*/
	struct nss_ctx_instance *nss_ipv6_get_mgr(void)
	{
	return (void *)&nss_top_main.nss[nss_top_main.ipv6_handler_id];
	}

	/*
	* nss_ipv6_register_handler()
	* Register our handler to receive messages for this interface
	*/
	void nss_ipv6_register_handler()
	{
	if (nss_core_register_handler(NSS_IPV6_RX_INTERFACE, nss_ipv6_rx_msg_handler, NULL) != NSS_CORE_STATUS_SUCCESS) {
	nss_warning("IPv6 handler failed to register");
	}
	}

	EXPORT_SYMBOL(nss_ipv6_tx);
	EXPORT_SYMBOL(nss_ipv6_notify_register);
	EXPORT_SYMBOL(nss_ipv6_notify_unregister);
	EXPORT_SYMBOL(nss_ipv6_get_mgr);
	EXPORT_SYMBOL(nss_ipv6_register_handler);