/******************************************************************************
 *
 * 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) 2017        Intel Deutschland GmbH
 * Copyright(c) 2018 - 2020 Intel Corporation
 *
 * 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.
 *
 * 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) 2017        Intel Deutschland GmbH
 * Copyright(c) 2018 - 2020 Intel Corporation
 * 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 "rs.h"
#include "fw-api.h"
#include "sta.h"
#include "iwl-op-mode.h"
#include "mvm.h"

static u8 rs_fw_bw_from_sta_bw(struct ieee80211_sta *sta)
{
	switch (sta->bandwidth) {
	case IEEE80211_STA_RX_BW_160:
		return IWL_TLC_MNG_CH_WIDTH_160MHZ;
	case IEEE80211_STA_RX_BW_80:
		return IWL_TLC_MNG_CH_WIDTH_80MHZ;
	case IEEE80211_STA_RX_BW_40:
		return IWL_TLC_MNG_CH_WIDTH_40MHZ;
	case IEEE80211_STA_RX_BW_20:
	default:
		return IWL_TLC_MNG_CH_WIDTH_20MHZ;
	}
}

static u8 rs_fw_set_active_chains(u8 chains)
{
	u8 fw_chains = 0;

	if (chains & ANT_A)
		fw_chains |= IWL_TLC_MNG_CHAIN_A_MSK;
	if (chains & ANT_B)
		fw_chains |= IWL_TLC_MNG_CHAIN_B_MSK;
	if (chains & ANT_C)
		WARN(false,
		     "tlc offload doesn't support antenna C. chains: 0x%x\n",
		     chains);

	return fw_chains;
}

static u8 rs_fw_sgi_cw_support(struct ieee80211_sta *sta)
{
	struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
	struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
	struct ieee80211_sta_he_cap *he_cap = &sta->he_cap;
	u8 supp = 0;

	if (he_cap->has_he)
		return 0;

	if (ht_cap->cap & IEEE80211_HT_CAP_SGI_20)
		supp |= BIT(IWL_TLC_MNG_CH_WIDTH_20MHZ);
	if (ht_cap->cap & IEEE80211_HT_CAP_SGI_40)
		supp |= BIT(IWL_TLC_MNG_CH_WIDTH_40MHZ);
	if (vht_cap->cap & IEEE80211_VHT_CAP_SHORT_GI_80)
		supp |= BIT(IWL_TLC_MNG_CH_WIDTH_80MHZ);
	if (vht_cap->cap & IEEE80211_VHT_CAP_SHORT_GI_160)
		supp |= BIT(IWL_TLC_MNG_CH_WIDTH_160MHZ);

	return supp;
}

static u16 rs_fw_get_config_flags(struct iwl_mvm *mvm,
				  struct ieee80211_sta *sta,
				  struct ieee80211_supported_band *sband)
{
	struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
	struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
	struct ieee80211_sta_he_cap *he_cap = &sta->he_cap;
	bool vht_ena = vht_cap->vht_supported;
	u16 flags = 0;

	if (mvm->cfg->ht_params->stbc &&
	    (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1)) {
		if (he_cap->has_he) {
			if (he_cap->he_cap_elem.phy_cap_info[2] &
			    IEEE80211_HE_PHY_CAP2_STBC_RX_UNDER_80MHZ)
				flags |= IWL_TLC_MNG_CFG_FLAGS_STBC_MSK;

			if (he_cap->he_cap_elem.phy_cap_info[7] &
			    IEEE80211_HE_PHY_CAP7_STBC_RX_ABOVE_80MHZ)
				flags |= IWL_TLC_MNG_CFG_FLAGS_HE_STBC_160MHZ_MSK;
		} else if ((ht_cap->cap & IEEE80211_HT_CAP_RX_STBC) ||
			   (vht_ena &&
			    (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)))
			flags |= IWL_TLC_MNG_CFG_FLAGS_STBC_MSK;
	}

	if (mvm->cfg->ht_params->ldpc &&
	    ((ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING) ||
	     (vht_ena && (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))))
		flags |= IWL_TLC_MNG_CFG_FLAGS_LDPC_MSK;

	/* consider LDPC support in case of HE */
	if (he_cap->has_he && (he_cap->he_cap_elem.phy_cap_info[1] &
	    IEEE80211_HE_PHY_CAP1_LDPC_CODING_IN_PAYLOAD))
		flags |= IWL_TLC_MNG_CFG_FLAGS_LDPC_MSK;

	if (sband->iftype_data && sband->iftype_data->he_cap.has_he &&
	    !(sband->iftype_data->he_cap.he_cap_elem.phy_cap_info[1] &
	     IEEE80211_HE_PHY_CAP1_LDPC_CODING_IN_PAYLOAD))
		flags &= ~IWL_TLC_MNG_CFG_FLAGS_LDPC_MSK;

	if (he_cap->has_he &&
	    (he_cap->he_cap_elem.phy_cap_info[3] &
	     IEEE80211_HE_PHY_CAP3_DCM_MAX_CONST_RX_MASK))
		flags |= IWL_TLC_MNG_CFG_FLAGS_HE_DCM_NSS_1_MSK;

	return flags;
}

static
int rs_fw_vht_highest_rx_mcs_index(const struct ieee80211_sta_vht_cap *vht_cap,
				   int nss)
{
	u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
		(0x3 << (2 * (nss - 1)));
	rx_mcs >>= (2 * (nss - 1));

	switch (rx_mcs) {
	case IEEE80211_VHT_MCS_SUPPORT_0_7:
		return IWL_TLC_MNG_HT_RATE_MCS7;
	case IEEE80211_VHT_MCS_SUPPORT_0_8:
		return IWL_TLC_MNG_HT_RATE_MCS8;
	case IEEE80211_VHT_MCS_SUPPORT_0_9:
		return IWL_TLC_MNG_HT_RATE_MCS9;
	default:
		WARN_ON_ONCE(1);
		break;
	}

	return 0;
}

static void
rs_fw_vht_set_enabled_rates(const struct ieee80211_sta *sta,
			    const struct ieee80211_sta_vht_cap *vht_cap,
			    struct iwl_tlc_config_cmd *cmd)
{
	u16 supp;
	int i, highest_mcs;
	u8 max_nss = sta->rx_nss;
	struct ieee80211_vht_cap ieee_vht_cap = {
		.vht_cap_info = cpu_to_le32(vht_cap->cap),
		.supp_mcs = vht_cap->vht_mcs,
	};

	/* the station support only a single receive chain */
	if (sta->smps_mode == IEEE80211_SMPS_STATIC)
		max_nss = 1;

	for (i = 0; i < max_nss && i < IWL_TLC_NSS_MAX; i++) {
		int nss = i + 1;

		highest_mcs = rs_fw_vht_highest_rx_mcs_index(vht_cap, nss);
		if (!highest_mcs)
			continue;

		supp = BIT(highest_mcs + 1) - 1;
		if (sta->bandwidth == IEEE80211_STA_RX_BW_20)
			supp &= ~BIT(IWL_TLC_MNG_HT_RATE_MCS9);

		cmd->ht_rates[i][IWL_TLC_HT_BW_NONE_160] = cpu_to_le16(supp);
		/*
		 * Check if VHT extended NSS indicates that the bandwidth/NSS
		 * configuration is supported - only for MCS 0 since we already
		 * decoded the MCS bits anyway ourselves.
		 */
		if (sta->bandwidth == IEEE80211_STA_RX_BW_160 &&
		    ieee80211_get_vht_max_nss(&ieee_vht_cap,
					      IEEE80211_VHT_CHANWIDTH_160MHZ,
					      0, true, nss) >= nss)
			cmd->ht_rates[i][IWL_TLC_HT_BW_160] =
				cmd->ht_rates[i][IWL_TLC_HT_BW_NONE_160];
	}
}

static u16 rs_fw_he_ieee80211_mcs_to_rs_mcs(u16 mcs)
{
	switch (mcs) {
	case IEEE80211_HE_MCS_SUPPORT_0_7:
		return BIT(IWL_TLC_MNG_HT_RATE_MCS7 + 1) - 1;
	case IEEE80211_HE_MCS_SUPPORT_0_9:
		return BIT(IWL_TLC_MNG_HT_RATE_MCS9 + 1) - 1;
	case IEEE80211_HE_MCS_SUPPORT_0_11:
		return BIT(IWL_TLC_MNG_HT_RATE_MCS11 + 1) - 1;
	case IEEE80211_HE_MCS_NOT_SUPPORTED:
		return 0;
	}

	WARN(1, "invalid HE MCS %d\n", mcs);
	return 0;
}

static void
rs_fw_he_set_enabled_rates(const struct ieee80211_sta *sta,
			   struct ieee80211_supported_band *sband,
			   struct iwl_tlc_config_cmd *cmd)
{
	const struct ieee80211_sta_he_cap *he_cap = &sta->he_cap;
	u16 mcs_160 = le16_to_cpu(he_cap->he_mcs_nss_supp.rx_mcs_160);
	u16 mcs_80 = le16_to_cpu(he_cap->he_mcs_nss_supp.rx_mcs_80);
	u16 tx_mcs_80 =
		le16_to_cpu(sband->iftype_data->he_cap.he_mcs_nss_supp.tx_mcs_80);
	u16 tx_mcs_160 =
		le16_to_cpu(sband->iftype_data->he_cap.he_mcs_nss_supp.tx_mcs_160);
	int i;
	u8 nss = sta->rx_nss;

	/* the station support only a single receive chain */
	if (sta->smps_mode == IEEE80211_SMPS_STATIC)
		nss = 1;

	for (i = 0; i < nss && i < IWL_TLC_NSS_MAX; i++) {
		u16 _mcs_160 = (mcs_160 >> (2 * i)) & 0x3;
		u16 _mcs_80 = (mcs_80 >> (2 * i)) & 0x3;
		u16 _tx_mcs_160 = (tx_mcs_160 >> (2 * i)) & 0x3;
		u16 _tx_mcs_80 = (tx_mcs_80 >> (2 * i)) & 0x3;

		/* If one side doesn't support - mark both as not supporting */
		if (_mcs_80 == IEEE80211_HE_MCS_NOT_SUPPORTED ||
		    _tx_mcs_80 == IEEE80211_HE_MCS_NOT_SUPPORTED) {
			_mcs_80 = IEEE80211_HE_MCS_NOT_SUPPORTED;
			_tx_mcs_80 = IEEE80211_HE_MCS_NOT_SUPPORTED;
		}
		if (_mcs_80 > _tx_mcs_80)
			_mcs_80 = _tx_mcs_80;
		cmd->ht_rates[i][IWL_TLC_HT_BW_NONE_160] =
			cpu_to_le16(rs_fw_he_ieee80211_mcs_to_rs_mcs(_mcs_80));

		/* If one side doesn't support - mark both as not supporting */
		if (_mcs_160 == IEEE80211_HE_MCS_NOT_SUPPORTED ||
		    _tx_mcs_160 == IEEE80211_HE_MCS_NOT_SUPPORTED) {
			_mcs_160 = IEEE80211_HE_MCS_NOT_SUPPORTED;
			_tx_mcs_160 = IEEE80211_HE_MCS_NOT_SUPPORTED;
		}
		if (_mcs_160 > _tx_mcs_160)
			_mcs_160 = _tx_mcs_160;
		cmd->ht_rates[i][IWL_TLC_HT_BW_160] =
			cpu_to_le16(rs_fw_he_ieee80211_mcs_to_rs_mcs(_mcs_160));
	}
}

static void rs_fw_set_supp_rates(struct ieee80211_sta *sta,
				 struct ieee80211_supported_band *sband,
				 struct iwl_tlc_config_cmd *cmd)
{
	int i;
	unsigned long tmp;
	unsigned long supp; /* must be unsigned long for for_each_set_bit */
	const struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
	const struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
	const struct ieee80211_sta_he_cap *he_cap = &sta->he_cap;

	/* non HT rates */
	supp = 0;
	tmp = sta->supp_rates[sband->band];
	for_each_set_bit(i, &tmp, BITS_PER_LONG)
		supp |= BIT(sband->bitrates[i].hw_value);

	cmd->non_ht_rates = cpu_to_le16(supp);
	cmd->mode = IWL_TLC_MNG_MODE_NON_HT;

	/* HT/VHT rates */
	if (he_cap->has_he) {
		cmd->mode = IWL_TLC_MNG_MODE_HE;
		rs_fw_he_set_enabled_rates(sta, sband, cmd);
	} else if (vht_cap->vht_supported) {
		cmd->mode = IWL_TLC_MNG_MODE_VHT;
		rs_fw_vht_set_enabled_rates(sta, vht_cap, cmd);
	} else if (ht_cap->ht_supported) {
		cmd->mode = IWL_TLC_MNG_MODE_HT;
		cmd->ht_rates[IWL_TLC_NSS_1][IWL_TLC_HT_BW_NONE_160] =
			cpu_to_le16(ht_cap->mcs.rx_mask[0]);

		/* the station support only a single receive chain */
		if (sta->smps_mode == IEEE80211_SMPS_STATIC)
			cmd->ht_rates[IWL_TLC_NSS_2][IWL_TLC_HT_BW_NONE_160] =
				0;
		else
			cmd->ht_rates[IWL_TLC_NSS_2][IWL_TLC_HT_BW_NONE_160] =
				cpu_to_le16(ht_cap->mcs.rx_mask[1]);
	}
}

void iwl_mvm_tlc_update_notif(struct iwl_mvm *mvm,
			      struct iwl_rx_cmd_buffer *rxb)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	struct iwl_tlc_update_notif *notif;
	struct ieee80211_sta *sta;
	struct iwl_mvm_sta *mvmsta;
	struct iwl_lq_sta_rs_fw *lq_sta;
	u32 flags;

	rcu_read_lock();

	notif = (void *)pkt->data;
	sta = rcu_dereference(mvm->fw_id_to_mac_id[notif->sta_id]);
	if (IS_ERR_OR_NULL(sta)) {
		IWL_ERR(mvm, "Invalid sta id (%d) in FW TLC notification\n",
			notif->sta_id);
		goto out;
	}

	mvmsta = iwl_mvm_sta_from_mac80211(sta);

	if (!mvmsta) {
		IWL_ERR(mvm, "Invalid sta id (%d) in FW TLC notification\n",
			notif->sta_id);
		goto out;
	}

	flags = le32_to_cpu(notif->flags);

	lq_sta = &mvmsta->lq_sta.rs_fw;

	if (flags & IWL_TLC_NOTIF_FLAG_RATE) {
		char pretty_rate[100];
		lq_sta->last_rate_n_flags = le32_to_cpu(notif->rate);
		rs_pretty_print_rate(pretty_rate, sizeof(pretty_rate),
				     lq_sta->last_rate_n_flags);
		IWL_DEBUG_RATE(mvm, "new rate: %s\n", pretty_rate);
	}

	if (flags & IWL_TLC_NOTIF_FLAG_AMSDU && !mvmsta->orig_amsdu_len) {
		u16 size = le32_to_cpu(notif->amsdu_size);
		int i;

		if (sta->max_amsdu_len < size) {
			/*
			 * In debug sta->max_amsdu_len < size
			 * so also check with orig_amsdu_len which holds the
			 * original data before debugfs changed the value
			 */
			WARN_ON(mvmsta->orig_amsdu_len < size);
			goto out;
		}

		mvmsta->amsdu_enabled = le32_to_cpu(notif->amsdu_enabled);
		mvmsta->max_amsdu_len = size;
		sta->max_rc_amsdu_len = mvmsta->max_amsdu_len;

		for (i = 0; i < IWL_MAX_TID_COUNT; i++) {
			if (mvmsta->amsdu_enabled & BIT(i))
				sta->max_tid_amsdu_len[i] =
					iwl_mvm_max_amsdu_size(mvm, sta, i);
			else
				/*
				 * Not so elegant, but this will effectively
				 * prevent AMSDU on this TID
				 */
				sta->max_tid_amsdu_len[i] = 1;
		}

		IWL_DEBUG_RATE(mvm,
			       "AMSDU update. AMSDU size: %d, AMSDU selected size: %d, AMSDU TID bitmap 0x%X\n",
			       le32_to_cpu(notif->amsdu_size), size,
			       mvmsta->amsdu_enabled);
	}
out:
	rcu_read_unlock();
}

u16 rs_fw_get_max_amsdu_len(struct ieee80211_sta *sta)
{
	const struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
	const struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;

	if (vht_cap->vht_supported) {
		switch (vht_cap->cap & IEEE80211_VHT_CAP_MAX_MPDU_MASK) {
		case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454:
			return IEEE80211_MAX_MPDU_LEN_VHT_11454;
		case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991:
			return IEEE80211_MAX_MPDU_LEN_VHT_7991;
		default:
			return IEEE80211_MAX_MPDU_LEN_VHT_3895;
		}
	} else if (ht_cap->ht_supported) {
		if (ht_cap->cap & IEEE80211_HT_CAP_MAX_AMSDU)
			/*
			 * agg is offloaded so we need to assume that agg
			 * are enabled and max mpdu in ampdu is 4095
			 * (spec 802.11-2016 9.3.2.1)
			 */
			return IEEE80211_MAX_MPDU_LEN_HT_BA;
		else
			return IEEE80211_MAX_MPDU_LEN_HT_3839;
	}

	/* in legacy mode no amsdu is enabled so return zero */
	return 0;
}

void rs_fw_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
		     enum nl80211_band band, bool update)
{
	struct ieee80211_hw *hw = mvm->hw;
	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
	struct iwl_lq_sta_rs_fw *lq_sta = &mvmsta->lq_sta.rs_fw;
	u32 cmd_id = iwl_cmd_id(TLC_MNG_CONFIG_CMD, DATA_PATH_GROUP, 0);
	struct ieee80211_supported_band *sband = hw->wiphy->bands[band];
	u16 max_amsdu_len = rs_fw_get_max_amsdu_len(sta);
	struct iwl_tlc_config_cmd cfg_cmd = {
		.sta_id = mvmsta->sta_id,
		.max_ch_width = update ?
			rs_fw_bw_from_sta_bw(sta) : RATE_MCS_CHAN_WIDTH_20,
		.flags = cpu_to_le16(rs_fw_get_config_flags(mvm, sta, sband)),
		.chains = rs_fw_set_active_chains(iwl_mvm_get_valid_tx_ant(mvm)),
		.sgi_ch_width_supp = rs_fw_sgi_cw_support(sta),
		.max_mpdu_len = cpu_to_le16(max_amsdu_len),
		.amsdu = iwl_mvm_is_csum_supported(mvm),
	};
	int ret;
	u16 cmd_size = sizeof(cfg_cmd);

	/* In old versions of the API the struct is 4 bytes smaller */
	if (iwl_fw_lookup_cmd_ver(mvm->fw, DATA_PATH_GROUP,
				  TLC_MNG_CONFIG_CMD, 0) < 3)
		cmd_size -= 4;

	memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));

#ifdef CONFIG_IWLWIFI_DEBUGFS
	iwl_mvm_reset_frame_stats(mvm);
#endif
	rs_fw_set_supp_rates(sta, sband, &cfg_cmd);

	/*
	 * since TLC offload works with one mode we can assume
	 * that only vht/ht is used and also set it as station max amsdu
	 */
	sta->max_amsdu_len = max_amsdu_len;

	ret = iwl_mvm_send_cmd_pdu(mvm, cmd_id, CMD_ASYNC, cmd_size,
				   &cfg_cmd);
	if (ret)
		IWL_ERR(mvm, "Failed to send rate scale config (%d)\n", ret);
}

int rs_fw_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
			bool enable)
{
	/* TODO: need to introduce a new FW cmd since LQ cmd is not relevant */
	IWL_DEBUG_RATE(mvm, "tx protection - not implemented yet.\n");
	return 0;
}

void iwl_mvm_rs_add_sta(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta)
{
	struct iwl_lq_sta_rs_fw *lq_sta = &mvmsta->lq_sta.rs_fw;

	IWL_DEBUG_RATE(mvm, "create station rate scale window\n");

	lq_sta->pers.drv = mvm;
	lq_sta->pers.sta_id = mvmsta->sta_id;
	lq_sta->pers.chains = 0;
	memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
	lq_sta->pers.last_rssi = S8_MIN;
	lq_sta->last_rate_n_flags = 0;

#ifdef CONFIG_MAC80211_DEBUGFS
	lq_sta->pers.dbg_fixed_rate = 0;
#endif
}