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

 /*
  **************************************************************************
  * Copyright (c) 2015-2016, 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_tx_rx_common.h"

 /*
  * nss_wifi_stats_sync()
  *	Handle the syncing of WIFI stats.
  */
 void nss_wifi_stats_sync(struct nss_ctx_instance *nss_ctx,
 		struct nss_wifi_stats_sync_msg *stats, uint16_t interface)
 {
 	struct nss_top_instance *nss_top = nss_ctx->nss_top;
 	uint32_t radio_id = interface - NSS_WIFI_INTERFACE0;
 	uint8_t i = 0;

 	if (radio_id >= NSS_MAX_WIFI_RADIO_INTERFACES) {
 		nss_warning("%p: invalid interface: %d", nss_ctx, interface);
 		return;
 	}

 	spin_lock_bh(&nss_top->stats_lock);

 	/*
 	 * Tx/Rx stats
 	 */
 	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_RX_PKTS] += stats->node_stats.rx_packets;
 	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_RX_DROPPED] += stats->node_stats.rx_dropped;
 	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TX_PKTS] += stats->node_stats.tx_packets;
 	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TX_DROPPED] += stats->tx_transmit_dropped;
 	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TX_COMPLETED] += stats->tx_transmit_completions;
 	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_MGMT_RCV_CNT] += stats->tx_mgmt_rcv_cnt;
 	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_MGMT_TX_PKTS] += stats->tx_mgmt_pkts;
 	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_MGMT_TX_DROPPED] += stats->tx_mgmt_dropped;
 	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_MGMT_TX_COMPLETIONS] += stats->tx_mgmt_completions;
 	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TX_INV_PEER_ENQUEUE_CNT] += stats->tx_inv_peer_enq_cnt;
 	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_RX_INV_PEER_RCV_CNT] += stats->rx_inv_peer_rcv_cnt;
 	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_RX_PN_CHECK_FAILED] += stats->rx_pn_check_failed;
 	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_RX_DELIVERED] += stats->rx_pkts_deliverd;
 	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_RX_BYTES_DELIVERED] += stats->rx_bytes_deliverd;
 	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TX_BYTES_COMPLETED] += stats->tx_bytes_transmit_completions;
 	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_RX_DELIVER_UNALIGNED_DROP_CNT] += stats->rx_deliver_unaligned_drop_cnt;

 	for (i = 0; i < NSS_WIFI_TX_NUM_TOS_TIDS; i++) {
 		nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TIDQ_ENQUEUE_CNT + i] += stats->tidq_enqueue_cnt[i];
 		nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TIDQ_DEQUEUE_CNT + i] += stats->tidq_dequeue_cnt[i];
 		nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TIDQ_ENQUEUE_FAIL_CNT + i] += stats->tidq_enqueue_fail_cnt[i];
 		nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TIDQ_TTL_EXPIRE_CNT + i] += stats->tidq_ttl_expire_cnt[i];
 		nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TIDQ_DEQUEUE_REQ_CNT + i] += stats->tidq_dequeue_req_cnt[i];
 	}

 	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_RX_HTT_FETCH_CNT] += stats->rx_htt_fetch_cnt;
 	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TOTAL_TIDQ_DEPTH] = stats->total_tidq_depth;
 	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TOTAL_TIDQ_BYPASS_CNT] += stats->total_tidq_bypass_cnt;
 	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_GLOBAL_Q_FULL_CNT] += stats->global_q_full_cnt;
 	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TIDQ_FULL_CNT] += stats->tidq_full_cnt;

 	spin_unlock_bh(&nss_top->stats_lock);
 }


 /*
  * nss_wifi_handler()
  * 	Handle NSS -> HLOS messages for wifi
  */
 static void nss_wifi_handler(struct nss_ctx_instance *nss_ctx, struct nss_cmn_msg *ncm, __attribute__((unused))void *app_data)
 {
 	struct nss_wifi_msg *ntm = (struct nss_wifi_msg *)ncm;
 	void *ctx;
 	nss_wifi_msg_callback_t cb;

 	nss_info("%p: NSS ->HLOS message for wifi\n", nss_ctx);

 	BUG_ON(((ncm->interface < NSS_WIFI_INTERFACE0) || (ncm->interface > NSS_WIFI_INTERFACE2)));

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

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

 	/*
 	 * Snoop messages for local driver and handle
 	 */
 	switch (ntm->cm.type) {
 	case NSS_WIFI_STATS_MSG:
 		/*
 		 * To create the old API gmac statistics, we use the new extended GMAC stats.
 		 */
 		nss_wifi_stats_sync(nss_ctx, &ntm->msg.statsmsg, ncm->interface);
 		break;
 	}

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

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

 	/*
 	 * Do we have a call back
 	 */
 	if (!ncm->cb) {
 		nss_info("%p: cb null for wifi interface %d", nss_ctx, ncm->interface);
 		return;
 	}

 	/*
 	 * Get callback & context
 	 */
 	cb = (nss_wifi_msg_callback_t)ncm->cb;
 	ctx =  nss_ctx->nss_top->subsys_dp_register[ncm->interface].ndev;

 	/*
 	 * call wifi msg callback
 	 */
 	if (!ctx) {
 		nss_warning("%p: Event received for wifi interface %d before registration", nss_ctx, ncm->interface);
 		return;
 	}

 	cb(ctx, ntm);
 }

 /*
  * nss_wifi_tx_msg
  * 	Transmit a wifi message to NSS FW
  */
 nss_tx_status_t nss_wifi_tx_msg(struct nss_ctx_instance *nss_ctx, struct nss_wifi_msg *msg)
 {
 	struct nss_wifi_msg *nm;
 	struct nss_cmn_msg *ncm = &msg->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: wifi message dropped as core not ready", nss_ctx);
 		return NSS_TX_FAILURE_NOT_READY;
 	}

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

 	if (nss_cmn_get_msg_len(ncm) > sizeof(struct nss_wifi_msg)) {
 		nss_warning("%p: wifi message length is invalid: %d", nss_ctx, nss_cmn_get_msg_len(ncm));
 		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_PKT_STATS_INCREMENT(nss_ctx, &nss_ctx->nss_top->stats_drv[NSS_STATS_DRV_NBUF_ALLOC_FAILS]);
 		spin_unlock_bh(&nss_ctx->nss_top->stats_lock);
 		nss_warning("%p: wifi message dropped as command allocation failed", nss_ctx);
 		return NSS_TX_FAILURE;
 	}

 	/*
 	 * Copy the message to our skb
 	 */
 	nm = (struct nss_wifi_msg *)skb_put(nbuf, sizeof(struct nss_wifi_msg));
 	memcpy(nm, msg, sizeof(struct nss_wifi_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 'wifi message'", 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_register_wifi_if()
  * 	Register Wifi with nss driver
  */
 struct nss_ctx_instance *nss_register_wifi_if(uint32_t if_num, nss_wifi_callback_t wifi_callback,
 			nss_wifi_callback_t wifi_ext_callback,
 			nss_wifi_msg_callback_t event_callback, struct net_device *netdev, uint32_t features)
 {
         nss_assert((if_num >= NSS_MAX_VIRTUAL_INTERFACES) && (if_num < NSS_MAX_NET_INTERFACES));

         nss_info("nss_register_wifi_if if_num %d wifictx %p", if_num, netdev);

 	nss_top_main.subsys_dp_register[if_num].ndev = netdev;
 	nss_top_main.subsys_dp_register[if_num].cb = wifi_callback;
 	nss_top_main.subsys_dp_register[if_num].ext_cb = wifi_ext_callback;
 	nss_top_main.subsys_dp_register[if_num].app_data = NULL;
 	nss_top_main.subsys_dp_register[if_num].features = features;

 	nss_top_main.wifi_msg_callback = event_callback;

 	return (struct nss_ctx_instance *)&nss_top_main.nss[nss_top_main.wifi_handler_id];
 }

 /*
  * nss_unregister_wifi_if()
  * 	Unregister wifi with nss driver
  */
 void nss_unregister_wifi_if(uint32_t if_num)
 {
         nss_assert((if_num >= NSS_MAX_VIRTUAL_INTERFACES) && (if_num < NSS_MAX_NET_INTERFACES));

 	nss_top_main.subsys_dp_register[if_num].ndev = NULL;
 	nss_top_main.subsys_dp_register[if_num].cb = NULL;
 	nss_top_main.subsys_dp_register[if_num].ext_cb = NULL;
 	nss_top_main.subsys_dp_register[if_num].app_data = NULL;
 	nss_top_main.subsys_dp_register[if_num].features = 0;
 }

 /*
  * nss_wifi_register_handler()
  * 	Register handle for notfication messages received on wifi interface
  */
 void nss_wifi_register_handler(void )
 {
 	nss_info("nss_wifi_register_handler");

 	nss_core_register_handler(NSS_WIFI_INTERFACE0, nss_wifi_handler, NULL);
 	nss_core_register_handler(NSS_WIFI_INTERFACE1, nss_wifi_handler, NULL);
 	nss_core_register_handler(NSS_WIFI_INTERFACE2, nss_wifi_handler, NULL);
 }

 EXPORT_SYMBOL(nss_wifi_tx_msg);
 EXPORT_SYMBOL(nss_register_wifi_if);
 EXPORT_SYMBOL(nss_unregister_wifi_if);
	/*
	**************************************************************************
	* Copyright (c) 2015-2016, 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_tx_rx_common.h"

	/*
	* nss_wifi_stats_sync()
	* Handle the syncing of WIFI stats.
	*/
	void nss_wifi_stats_sync(struct nss_ctx_instance *nss_ctx,
	struct nss_wifi_stats_sync_msg *stats, uint16_t interface)
	{
	struct nss_top_instance *nss_top = nss_ctx->nss_top;
	uint32_t radio_id = interface - NSS_WIFI_INTERFACE0;
	uint8_t i = 0;

	if (radio_id >= NSS_MAX_WIFI_RADIO_INTERFACES) {
	nss_warning("%p: invalid interface: %d", nss_ctx, interface);
	return;
	}

	spin_lock_bh(&nss_top->stats_lock);

	/*
	* Tx/Rx stats
	*/
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_RX_PKTS] += stats->node_stats.rx_packets;
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_RX_DROPPED] += stats->node_stats.rx_dropped;
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TX_PKTS] += stats->node_stats.tx_packets;
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TX_DROPPED] += stats->tx_transmit_dropped;
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TX_COMPLETED] += stats->tx_transmit_completions;
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_MGMT_RCV_CNT] += stats->tx_mgmt_rcv_cnt;
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_MGMT_TX_PKTS] += stats->tx_mgmt_pkts;
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_MGMT_TX_DROPPED] += stats->tx_mgmt_dropped;
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_MGMT_TX_COMPLETIONS] += stats->tx_mgmt_completions;
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TX_INV_PEER_ENQUEUE_CNT] += stats->tx_inv_peer_enq_cnt;
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_RX_INV_PEER_RCV_CNT] += stats->rx_inv_peer_rcv_cnt;
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_RX_PN_CHECK_FAILED] += stats->rx_pn_check_failed;
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_RX_DELIVERED] += stats->rx_pkts_deliverd;
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_RX_BYTES_DELIVERED] += stats->rx_bytes_deliverd;
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TX_BYTES_COMPLETED] += stats->tx_bytes_transmit_completions;
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_RX_DELIVER_UNALIGNED_DROP_CNT] += stats->rx_deliver_unaligned_drop_cnt;

	for (i = 0; i < NSS_WIFI_TX_NUM_TOS_TIDS; i++) {
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TIDQ_ENQUEUE_CNT + i] += stats->tidq_enqueue_cnt[i];
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TIDQ_DEQUEUE_CNT + i] += stats->tidq_dequeue_cnt[i];
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TIDQ_ENQUEUE_FAIL_CNT + i] += stats->tidq_enqueue_fail_cnt[i];
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TIDQ_TTL_EXPIRE_CNT + i] += stats->tidq_ttl_expire_cnt[i];
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TIDQ_DEQUEUE_REQ_CNT + i] += stats->tidq_dequeue_req_cnt[i];
	}

	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_RX_HTT_FETCH_CNT] += stats->rx_htt_fetch_cnt;
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TOTAL_TIDQ_DEPTH] = stats->total_tidq_depth;
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TOTAL_TIDQ_BYPASS_CNT] += stats->total_tidq_bypass_cnt;
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_GLOBAL_Q_FULL_CNT] += stats->global_q_full_cnt;
	nss_top->stats_wifi[radio_id][NSS_STATS_WIFI_TIDQ_FULL_CNT] += stats->tidq_full_cnt;

	spin_unlock_bh(&nss_top->stats_lock);
	}


	/*
	* nss_wifi_handler()
	* Handle NSS -> HLOS messages for wifi
	*/
	static void nss_wifi_handler(struct nss_ctx_instance nss_ctx, struct nss_cmn_msg ncm, __attribute__((unused))void *app_data)
	{
	struct nss_wifi_msg ntm = (struct nss_wifi_msg )ncm;
	void *ctx;
	nss_wifi_msg_callback_t cb;

	nss_info("%p: NSS ->HLOS message for wifi\n", nss_ctx);

	BUG_ON(((ncm->interface < NSS_WIFI_INTERFACE0) \|\| (ncm->interface > NSS_WIFI_INTERFACE2)));

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

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

	/*
	* Snoop messages for local driver and handle
	*/
	switch (ntm->cm.type) {
	case NSS_WIFI_STATS_MSG:
	/*
	* To create the old API gmac statistics, we use the new extended GMAC stats.
	*/
	nss_wifi_stats_sync(nss_ctx, &ntm->msg.statsmsg, ncm->interface);
	break;
	}

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

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

	/*
	* Do we have a call back
	*/
	if (!ncm->cb) {
	nss_info("%p: cb null for wifi interface %d", nss_ctx, ncm->interface);
	return;
	}

	/*
	* Get callback & context
	*/
	cb = (nss_wifi_msg_callback_t)ncm->cb;
	ctx = nss_ctx->nss_top->subsys_dp_register[ncm->interface].ndev;

	/*
	* call wifi msg callback
	*/
	if (!ctx) {
	nss_warning("%p: Event received for wifi interface %d before registration", nss_ctx, ncm->interface);
	return;
	}

	cb(ctx, ntm);
	}

	/*
	* nss_wifi_tx_msg
	* Transmit a wifi message to NSS FW
	*/
	nss_tx_status_t nss_wifi_tx_msg(struct nss_ctx_instance nss_ctx, struct nss_wifi_msg msg)
	{
	struct nss_wifi_msg *nm;
	struct nss_cmn_msg *ncm = &msg->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: wifi message dropped as core not ready", nss_ctx);
	return NSS_TX_FAILURE_NOT_READY;
	}

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

	if (nss_cmn_get_msg_len(ncm) > sizeof(struct nss_wifi_msg)) {
	nss_warning("%p: wifi message length is invalid: %d", nss_ctx, nss_cmn_get_msg_len(ncm));
	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_PKT_STATS_INCREMENT(nss_ctx, &nss_ctx->nss_top->stats_drv[NSS_STATS_DRV_NBUF_ALLOC_FAILS]);
	spin_unlock_bh(&nss_ctx->nss_top->stats_lock);
	nss_warning("%p: wifi message dropped as command allocation failed", nss_ctx);
	return NSS_TX_FAILURE;
	}

	/*
	* Copy the message to our skb
	*/
	nm = (struct nss_wifi_msg *)skb_put(nbuf, sizeof(struct nss_wifi_msg));
	memcpy(nm, msg, sizeof(struct nss_wifi_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 'wifi message'", 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_register_wifi_if()
	* Register Wifi with nss driver
	*/
	struct nss_ctx_instance *nss_register_wifi_if(uint32_t if_num, nss_wifi_callback_t wifi_callback,
	nss_wifi_callback_t wifi_ext_callback,
	nss_wifi_msg_callback_t event_callback, struct net_device *netdev, uint32_t features)
	{
	nss_assert((if_num >= NSS_MAX_VIRTUAL_INTERFACES) && (if_num < NSS_MAX_NET_INTERFACES));

	nss_info("nss_register_wifi_if if_num %d wifictx %p", if_num, netdev);

	nss_top_main.subsys_dp_register[if_num].ndev = netdev;
	nss_top_main.subsys_dp_register[if_num].cb = wifi_callback;
	nss_top_main.subsys_dp_register[if_num].ext_cb = wifi_ext_callback;
	nss_top_main.subsys_dp_register[if_num].app_data = NULL;
	nss_top_main.subsys_dp_register[if_num].features = features;

	nss_top_main.wifi_msg_callback = event_callback;

	return (struct nss_ctx_instance *)&nss_top_main.nss[nss_top_main.wifi_handler_id];
	}

	/*
	* nss_unregister_wifi_if()
	* Unregister wifi with nss driver
	*/
	void nss_unregister_wifi_if(uint32_t if_num)
	{
	nss_assert((if_num >= NSS_MAX_VIRTUAL_INTERFACES) && (if_num < NSS_MAX_NET_INTERFACES));

	nss_top_main.subsys_dp_register[if_num].ndev = NULL;
	nss_top_main.subsys_dp_register[if_num].cb = NULL;
	nss_top_main.subsys_dp_register[if_num].ext_cb = NULL;
	nss_top_main.subsys_dp_register[if_num].app_data = NULL;
	nss_top_main.subsys_dp_register[if_num].features = 0;
	}

	/*
	* nss_wifi_register_handler()
	* Register handle for notfication messages received on wifi interface
	*/
	void nss_wifi_register_handler(void )
	{
	nss_info("nss_wifi_register_handler");

	nss_core_register_handler(NSS_WIFI_INTERFACE0, nss_wifi_handler, NULL);
	nss_core_register_handler(NSS_WIFI_INTERFACE1, nss_wifi_handler, NULL);
	nss_core_register_handler(NSS_WIFI_INTERFACE2, nss_wifi_handler, NULL);
	}

	EXPORT_SYMBOL(nss_wifi_tx_msg);
	EXPORT_SYMBOL(nss_register_wifi_if);
	EXPORT_SYMBOL(nss_unregister_wifi_if);