/******************************************************************************
 *
 * 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) 2012 - 2013 Intel Corporation. All rights reserved.
 *
 * 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 <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
 * 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 <net/mac80211.h>
#include "fw-api.h"
#include "mvm.h"

struct iwl_mvm_quota_iterator_data {
	int n_interfaces[MAX_BINDINGS];
	int colors[MAX_BINDINGS];
	struct ieee80211_vif *new_vif;
};

static void iwl_mvm_quota_iterator(void *_data, u8 *mac,
				   struct ieee80211_vif *vif)
{
	struct iwl_mvm_quota_iterator_data *data = _data;
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	u16 id;

	/*
	 * We'll account for the new interface (if any) below,
	 * skip it here in case we're not called from within
	 * the add_interface callback (otherwise it won't show
	 * up in iteration)
	 */
	if (vif == data->new_vif)
		return;

	if (!mvmvif->phy_ctxt)
		return;

	/* currently, PHY ID == binding ID */
	id = mvmvif->phy_ctxt->id;

	/* need at least one binding per PHY */
	BUILD_BUG_ON(NUM_PHY_CTX > MAX_BINDINGS);

	if (WARN_ON_ONCE(id >= MAX_BINDINGS))
		return;

	if (data->colors[id] < 0)
		data->colors[id] = mvmvif->phy_ctxt->color;
	else
		WARN_ON_ONCE(data->colors[id] != mvmvif->phy_ctxt->color);

	switch (vif->type) {
	case NL80211_IFTYPE_STATION:
		if (vif->bss_conf.assoc)
			data->n_interfaces[id]++;
		break;
	case NL80211_IFTYPE_AP:
		if (mvmvif->ap_active)
			data->n_interfaces[id]++;
		break;
	case NL80211_IFTYPE_MONITOR:
		if (mvmvif->monitor_active)
			data->n_interfaces[id]++;
		break;
	case NL80211_IFTYPE_P2P_DEVICE:
		break;
	case NL80211_IFTYPE_ADHOC:
		if (vif->bss_conf.ibss_joined)
			data->n_interfaces[id]++;
		break;
	default:
		WARN_ON_ONCE(1);
		break;
	}
}

int iwl_mvm_update_quotas(struct iwl_mvm *mvm, struct ieee80211_vif *newvif)
{
	struct iwl_time_quota_cmd cmd;
	int i, idx, ret, num_active_bindings, quota, quota_rem;
	struct iwl_mvm_quota_iterator_data data = {
		.n_interfaces = {},
		.colors = { -1, -1, -1, -1 },
		.new_vif = newvif,
	};

	/* update all upon completion */
	if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))
		return 0;

	BUILD_BUG_ON(data.colors[MAX_BINDINGS - 1] != -1);

	lockdep_assert_held(&mvm->mutex);

	memset(&cmd, 0, sizeof(cmd));

	ieee80211_iterate_active_interfaces_atomic(
		mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
		iwl_mvm_quota_iterator, &data);
	if (newvif) {
		data.new_vif = NULL;
		iwl_mvm_quota_iterator(&data, newvif->addr, newvif);
	}

	/*
	 * The FW's scheduling session consists of
	 * IWL_MVM_MAX_QUOTA fragments. Divide these fragments
	 * equally between all the bindings that require quota
	 */
	num_active_bindings = 0;
	for (i = 0; i < MAX_BINDINGS; i++) {
		cmd.quotas[i].id_and_color = cpu_to_le32(FW_CTXT_INVALID);
		if (data.n_interfaces[i] > 0)
			num_active_bindings++;
	}

	if (!num_active_bindings)
		goto send_cmd;

	quota = IWL_MVM_MAX_QUOTA / num_active_bindings;
	quota_rem = IWL_MVM_MAX_QUOTA % num_active_bindings;

	for (idx = 0, i = 0; i < MAX_BINDINGS; i++) {
		if (data.n_interfaces[i] <= 0)
			continue;

		cmd.quotas[idx].id_and_color =
			cpu_to_le32(FW_CMD_ID_AND_COLOR(i, data.colors[i]));
		cmd.quotas[idx].quota = cpu_to_le32(quota);
		cmd.quotas[idx].max_duration = cpu_to_le32(IWL_MVM_MAX_QUOTA);
		idx++;
	}

	/* Give the remainder of the session to the first binding */
	le32_add_cpu(&cmd.quotas[0].quota, quota_rem);

send_cmd:
	ret = iwl_mvm_send_cmd_pdu(mvm, TIME_QUOTA_CMD, CMD_SYNC,
				   sizeof(cmd), &cmd);
	if (ret)
		IWL_ERR(mvm, "Failed to send quota: %d\n", ret);
	return ret;
}