/*
 * Copyright (c) 2014 genua mbh <info@genua.de>
 * Copyright (c) 2014 Fixup Software Ltd.
 *
 * Permission to use, copy, modify, and 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.
 */

/*-
 * Based on BSD-licensed source modules in the Linux iwlwifi driver,
 * which were used as the reference documentation for this implementation.
 *
 * Driver version we are currently based off of is
 * Linux 4.7.3 (tag id d7f6728f57e3ecbb7ef34eb7d9f564d514775d75)
 *
 ******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2013 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
 * USA
 *
 * The full GNU General Public License is included in this distribution
 * in the file called COPYING.
 *
 * Contact Information:
 *  Intel Linux Wireless <linuxwifi@intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2013 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *****************************************************************************/

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "opt_wlan.h"
#include "opt_iwm.h"

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/endian.h>
#include <sys/firmware.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/mutex.h>
#include <sys/module.h>
#include <sys/proc.h>
#include <sys/rman.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/linker.h>

#include <machine/bus.h>
#include <machine/endian.h>
#include <machine/resource.h>

#include <net/if.h>
#include <net/if_var.h>
#include <net/if_arp.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_types.h>
#include <net/bpf.h>

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/if_ether.h>
#include <netinet/ip.h>

#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_regdomain.h>
#include <net80211/ieee80211_ratectl.h>
#include <net80211/ieee80211_radiotap.h>

#include <dev/iwm/if_iwmreg.h>
#include <dev/iwm/if_iwmvar.h>
#include <dev/iwm/if_iwm_config.h>
#include <dev/iwm/if_iwm_debug.h>
#include <dev/iwm/if_iwm_util.h>
#include <dev/iwm/if_iwm_sf.h>

/*
 * Aging and idle timeouts for the different possible scenarios
 * in default configuration
 */
static const uint32_t
sf_full_timeout_def[IWM_SF_NUM_SCENARIO][IWM_SF_NUM_TIMEOUT_TYPES] = {
	{
		htole32(IWM_SF_SINGLE_UNICAST_AGING_TIMER_DEF),
		htole32(IWM_SF_SINGLE_UNICAST_IDLE_TIMER_DEF)
	},
	{
		htole32(IWM_SF_AGG_UNICAST_AGING_TIMER_DEF),
		htole32(IWM_SF_AGG_UNICAST_IDLE_TIMER_DEF)
	},
	{
		htole32(IWM_SF_MCAST_AGING_TIMER_DEF),
		htole32(IWM_SF_MCAST_IDLE_TIMER_DEF)
	},
	{
		htole32(IWM_SF_BA_AGING_TIMER_DEF),
		htole32(IWM_SF_BA_IDLE_TIMER_DEF)
	},
	{
		htole32(IWM_SF_TX_RE_AGING_TIMER_DEF),
		htole32(IWM_SF_TX_RE_IDLE_TIMER_DEF)
	},
};

/*
 * Aging and idle timeouts for the different possible scenarios
 * in single BSS MAC configuration.
 */
static const uint32_t
sf_full_timeout[IWM_SF_NUM_SCENARIO][IWM_SF_NUM_TIMEOUT_TYPES] = {
	{
		htole32(IWM_SF_SINGLE_UNICAST_AGING_TIMER),
		htole32(IWM_SF_SINGLE_UNICAST_IDLE_TIMER)
	},
	{
		htole32(IWM_SF_AGG_UNICAST_AGING_TIMER),
		htole32(IWM_SF_AGG_UNICAST_IDLE_TIMER)
	},
	{
		htole32(IWM_SF_MCAST_AGING_TIMER),
		htole32(IWM_SF_MCAST_IDLE_TIMER)
	},
	{
		htole32(IWM_SF_BA_AGING_TIMER),
		htole32(IWM_SF_BA_IDLE_TIMER)
	},
	{
		htole32(IWM_SF_TX_RE_AGING_TIMER),
		htole32(IWM_SF_TX_RE_IDLE_TIMER)
	},
};

static void
iwm_fill_sf_command(struct iwm_softc *sc, struct iwm_sf_cfg_cmd *sf_cmd,
	struct ieee80211_node *ni)
{
	int i, j, watermark;

	sf_cmd->watermark[IWM_SF_LONG_DELAY_ON] = htole32(IWM_SF_W_MARK_SCAN);

	/*
	 * If we are in association flow - check antenna configuration
	 * capabilities of the AP station, and choose the watermark accordingly.
	 */
	if (ni) {
		if (ni->ni_flags & IEEE80211_NODE_HT) {
			watermark = IWM_SF_W_MARK_SISO;
		} else {
			watermark = IWM_SF_W_MARK_LEGACY;
		}
	/* default watermark value for unassociated mode. */
	} else {
		watermark = IWM_SF_W_MARK_MIMO2;
	}
	sf_cmd->watermark[IWM_SF_FULL_ON] = htole32(watermark);

	for (i = 0; i < IWM_SF_NUM_SCENARIO; i++) {
		for (j = 0; j < IWM_SF_NUM_TIMEOUT_TYPES; j++) {
			sf_cmd->long_delay_timeouts[i][j] =
					htole32(IWM_SF_LONG_DELAY_AGING_TIMER);
		}
	}

	if (ni) {
		_Static_assert(sizeof(sf_full_timeout) == sizeof(uint32_t) *
		    IWM_SF_NUM_SCENARIO * IWM_SF_NUM_TIMEOUT_TYPES,
		    "sf_full_timeout has wrong size");

		memcpy(sf_cmd->full_on_timeouts, sf_full_timeout,
		       sizeof(sf_full_timeout));
	} else {
		_Static_assert(sizeof(sf_full_timeout_def) == sizeof(uint32_t) *
		    IWM_SF_NUM_SCENARIO * IWM_SF_NUM_TIMEOUT_TYPES,
		    "sf_full_timeout_def has wrong size");

		memcpy(sf_cmd->full_on_timeouts, sf_full_timeout_def,
		       sizeof(sf_full_timeout_def));
	}
}

static int
iwm_sf_config(struct iwm_softc *sc, struct ieee80211_node *ni,
	enum iwm_sf_state new_state)
{
	struct iwm_sf_cfg_cmd sf_cmd = {
		.state = htole32(new_state),
	};
	int ret = 0;

#ifdef notyet	/* only relevant for sdio variants */
	if (sc->cfg->disable_dummy_notification)
		sf_cmd.state |= htole32(IWM_SF_CFG_DUMMY_NOTIF_OFF);
#endif

	/*
	 * If an associated AP sta changed its antenna configuration, the state
	 * will remain FULL_ON but SF parameters need to be reconsidered.
	 */
	if (new_state != IWM_SF_FULL_ON && sc->sf_state == new_state)
		return 0;

	switch (new_state) {
	case IWM_SF_UNINIT:
		iwm_fill_sf_command(sc, &sf_cmd, NULL);
		break;
	case IWM_SF_FULL_ON:
		iwm_fill_sf_command(sc, &sf_cmd, ni);
		break;
	case IWM_SF_INIT_OFF:
		iwm_fill_sf_command(sc, &sf_cmd, NULL);
		break;
	default:
		device_printf(sc->sc_dev,
		    "Invalid state: %d. not sending Smart Fifo cmd\n",
		    new_state);
		return EINVAL;
	}

	ret = iwm_send_cmd_pdu(sc, IWM_REPLY_SF_CFG_CMD, IWM_CMD_ASYNC,
				   sizeof(sf_cmd), &sf_cmd);
	if (!ret)
		sc->sf_state = new_state;

	return ret;
}

/*
 * Update Smart fifo:
 * Count bound interfaces that are not to be removed, ignoring p2p devices,
 * and set new state accordingly.
 */
int
iwm_sf_update(struct iwm_softc *sc, struct ieee80211vap *changed_vif,
	boolean_t remove_vif)
{
	enum iwm_sf_state new_state;
	struct ieee80211_node *ni = NULL;
	int num_active_macs = 0;

	/* If changed_vif exists and is not to be removed, add to the count */
	if (changed_vif && !remove_vif)
		num_active_macs++;

	switch (num_active_macs) {
	case 0:
		/* If there are no active macs - change state to SF_INIT_OFF */
		new_state = IWM_SF_INIT_OFF;
		break;
	case 1:
		if (!changed_vif)
			return EINVAL;
		ni = changed_vif->iv_bss;
		if (ni != NULL && IWM_NODE(ni)->in_assoc &&
		    changed_vif->iv_dtim_period) {
			new_state = IWM_SF_FULL_ON;
		} else {
			new_state = IWM_SF_INIT_OFF;
		}
		break;
	default:
		/* If there are multiple active macs - change to SF_UNINIT */
		new_state = IWM_SF_UNINIT;
	}
	return iwm_sf_config(sc, ni, new_state);
}