nss_wifi.c

/*
 **************************************************************************
 * Copyright (c) 2015, 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;

	spin_lock_bh(&nss_top->stats_lock);

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

	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 (ncm->len > sizeof(struct nss_wifi_msg)) {
		nss_warning("%p: tx request for another interface: %d", nss_ctx, ncm->interface);
		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 (ncm->len > sizeof(struct nss_wifi_msg)) {
		nss_warning("%p: wifi message length is invalid: %d", nss_ctx, ncm->len);
		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_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].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].app_data = NULL;
	nss_top_main.subsys_dp_register[if_num].features = 0;

	nss_top_main.wifi_msg_callback = NULL;

	nss_core_unregister_handler(if_num);
}

/*
 * 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);