drivers/net/wireless/iwlwifi/mvm/tx.c

/******************************************************************************
 *
 * 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 - 2014 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 - 2014 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 <linux/ieee80211.h>
#include <linux/etherdevice.h>

#include "iwl-trans.h"
#include "iwl-eeprom-parse.h"
#include "mvm.h"
#include "sta.h"

/*
 * Sets most of the Tx cmd's fields
 */
static void iwl_mvm_set_tx_cmd(struct iwl_mvm *mvm, struct sk_buff *skb,
			       struct iwl_tx_cmd *tx_cmd,
			       struct ieee80211_tx_info *info, u8 sta_id)
{
	struct ieee80211_hdr *hdr = (void *)skb->data;
	__le16 fc = hdr->frame_control;
	u32 tx_flags = le32_to_cpu(tx_cmd->tx_flags);
	u32 len = skb->len + FCS_LEN;
	u8 ac;

	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
		tx_flags |= TX_CMD_FLG_ACK;
	else
		tx_flags &= ~TX_CMD_FLG_ACK;

	if (ieee80211_is_probe_resp(fc))
		tx_flags |= TX_CMD_FLG_TSF;
	else if (ieee80211_is_back_req(fc))
		tx_flags |= TX_CMD_FLG_ACK | TX_CMD_FLG_BAR;

	if (ieee80211_has_morefrags(fc))
		tx_flags |= TX_CMD_FLG_MORE_FRAG;

	if (ieee80211_is_data_qos(fc)) {
		u8 *qc = ieee80211_get_qos_ctl(hdr);
		tx_cmd->tid_tspec = qc[0] & 0xf;
		tx_flags &= ~TX_CMD_FLG_SEQ_CTL;
	} else {
		tx_cmd->tid_tspec = IWL_TID_NON_QOS;
		if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
			tx_flags |= TX_CMD_FLG_SEQ_CTL;
		else
			tx_flags &= ~TX_CMD_FLG_SEQ_CTL;
	}

	/* tid_tspec will default to 0 = BE when QOS isn't enabled */
	ac = tid_to_mac80211_ac[tx_cmd->tid_tspec];
	tx_flags |= iwl_mvm_bt_coex_tx_prio(mvm, hdr, info, ac) <<
			TX_CMD_FLG_BT_PRIO_POS;

	if (ieee80211_is_mgmt(fc)) {
		if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
			tx_cmd->pm_frame_timeout = cpu_to_le16(3);
		else
			tx_cmd->pm_frame_timeout = cpu_to_le16(2);

		/* The spec allows Action frames in A-MPDU, we don't support
		 * it
		 */
		WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_AMPDU);
	} else if (info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO) {
		tx_cmd->pm_frame_timeout = cpu_to_le16(2);
	} else {
		tx_cmd->pm_frame_timeout = 0;
	}

	if (ieee80211_is_data(fc) && len > mvm->rts_threshold &&
	    !is_multicast_ether_addr(ieee80211_get_DA(hdr)))
		tx_flags |= TX_CMD_FLG_PROT_REQUIRE;

	tx_cmd->tx_flags = cpu_to_le32(tx_flags);
	/* Total # bytes to be transmitted */
	tx_cmd->len = cpu_to_le16((u16)skb->len);
	tx_cmd->next_frame_len = 0;
	tx_cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
	tx_cmd->sta_id = sta_id;
}

/*
 * Sets the fields in the Tx cmd that are rate related
 */
static void iwl_mvm_set_tx_cmd_rate(struct iwl_mvm *mvm,
				    struct iwl_tx_cmd *tx_cmd,
				    struct ieee80211_tx_info *info,
				    struct ieee80211_sta *sta,
				    __le16 fc)
{
	u32 rate_flags;
	int rate_idx;
	u8 rate_plcp;

	/* Set retry limit on RTS packets */
	tx_cmd->rts_retry_limit = IWL_RTS_DFAULT_RETRY_LIMIT;

	/* Set retry limit on DATA packets and Probe Responses*/
	if (ieee80211_is_probe_resp(fc)) {
		tx_cmd->data_retry_limit = IWL_MGMT_DFAULT_RETRY_LIMIT;
		tx_cmd->rts_retry_limit =
			min(tx_cmd->data_retry_limit, tx_cmd->rts_retry_limit);
	} else if (ieee80211_is_back_req(fc)) {
		tx_cmd->data_retry_limit = IWL_BAR_DFAULT_RETRY_LIMIT;
	} else {
		tx_cmd->data_retry_limit = IWL_DEFAULT_TX_RETRY;
	}

	/*
	 * for data packets, rate info comes from the table inside the fw. This
	 * table is controlled by LINK_QUALITY commands. Exclude ctrl port
	 * frames like EAPOLs which should be treated as mgmt frames. This
	 * avoids them being sent initially in high rates which increases the
	 * chances for completion of the 4-Way handshake.
	 */

	if (ieee80211_is_data(fc) && sta &&
	    !(info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO)) {
		tx_cmd->initial_rate_index = 0;
		tx_cmd->tx_flags |= cpu_to_le32(TX_CMD_FLG_STA_RATE);
		return;
	} else if (ieee80211_is_back_req(fc)) {
		tx_cmd->tx_flags |=
			cpu_to_le32(TX_CMD_FLG_ACK | TX_CMD_FLG_BAR);
	}

	/* HT rate doesn't make sense for a non data frame */
	WARN_ONCE(info->control.rates[0].flags & IEEE80211_TX_RC_MCS,
		  "Got an HT rate for a non data frame 0x%x\n",
		  info->control.rates[0].flags);

	rate_idx = info->control.rates[0].idx;
	/* if the rate isn't a well known legacy rate, take the lowest one */
	if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT_LEGACY)
		rate_idx = rate_lowest_index(
				&mvm->nvm_data->bands[info->band], sta);

	/* For 5 GHZ band, remap mac80211 rate indices into driver indices */
	if (info->band == IEEE80211_BAND_5GHZ)
		rate_idx += IWL_FIRST_OFDM_RATE;

	/* For 2.4 GHZ band, check that there is no need to remap */
	BUILD_BUG_ON(IWL_FIRST_CCK_RATE != 0);

	/* Get PLCP rate for tx_cmd->rate_n_flags */
	rate_plcp = iwl_mvm_mac80211_idx_to_hwrate(rate_idx);

	mvm->mgmt_last_antenna_idx =
		iwl_mvm_next_antenna(mvm, mvm->fw->valid_tx_ant,
				     mvm->mgmt_last_antenna_idx);

	if (info->band == IEEE80211_BAND_2GHZ &&
	    !iwl_mvm_bt_coex_is_shared_ant_avail(mvm))
		rate_flags = BIT(ANT_A) << RATE_MCS_ANT_POS;
	else
		rate_flags =
			BIT(mvm->mgmt_last_antenna_idx) << RATE_MCS_ANT_POS;

	/* Set CCK flag as needed */
	if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
		rate_flags |= RATE_MCS_CCK_MSK;

	/* Set the rate in the TX cmd */
	tx_cmd->rate_n_flags = cpu_to_le32((u32)rate_plcp | rate_flags);
}

/*
 * Sets the fields in the Tx cmd that are crypto related
 */
static void iwl_mvm_set_tx_cmd_crypto(struct iwl_mvm *mvm,
				      struct ieee80211_tx_info *info,
				      struct iwl_tx_cmd *tx_cmd,
				      struct sk_buff *skb_frag)
{
	struct ieee80211_key_conf *keyconf = info->control.hw_key;

	switch (keyconf->cipher) {
	case WLAN_CIPHER_SUITE_CCMP:
		tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
		memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
		if (info->flags & IEEE80211_TX_CTL_AMPDU)
			tx_cmd->tx_flags |= cpu_to_le32(TX_CMD_FLG_CCMP_AGG);
		break;

	case WLAN_CIPHER_SUITE_TKIP:
		tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
		ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
		break;

	case WLAN_CIPHER_SUITE_WEP104:
		tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
		/* fall through */
	case WLAN_CIPHER_SUITE_WEP40:
		tx_cmd->sec_ctl |= TX_CMD_SEC_WEP |
			((keyconf->keyidx << TX_CMD_SEC_WEP_KEY_IDX_POS) &
			  TX_CMD_SEC_WEP_KEY_IDX_MSK);

		memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
		break;
	default:
		tx_cmd->sec_ctl |= TX_CMD_SEC_EXT;
	}
}

/*
 * Allocates and sets the Tx cmd the driver data pointers in the skb
 */
static struct iwl_device_cmd *
iwl_mvm_set_tx_params(struct iwl_mvm *mvm, struct sk_buff *skb,
		      struct ieee80211_sta *sta, u8 sta_id)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct iwl_device_cmd *dev_cmd;
	struct iwl_tx_cmd *tx_cmd;

	dev_cmd = iwl_trans_alloc_tx_cmd(mvm->trans);

	if (unlikely(!dev_cmd))
		return NULL;

	memset(dev_cmd, 0, sizeof(*dev_cmd));
	dev_cmd->hdr.cmd = TX_CMD;
	tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;

	if (info->control.hw_key)
		iwl_mvm_set_tx_cmd_crypto(mvm, info, tx_cmd, skb);

	iwl_mvm_set_tx_cmd(mvm, skb, tx_cmd, info, sta_id);

	iwl_mvm_set_tx_cmd_rate(mvm, tx_cmd, info, sta, hdr->frame_control);

	memset(&info->status, 0, sizeof(info->status));

	info->driver_data[0] = NULL;
	info->driver_data[1] = dev_cmd;

	return dev_cmd;
}

int iwl_mvm_tx_skb_non_sta(struct iwl_mvm *mvm, struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct iwl_device_cmd *dev_cmd;
	struct iwl_tx_cmd *tx_cmd;
	u8 sta_id;

	if (WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_AMPDU))
		return -1;

	if (WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
			 (!info->control.vif ||
			  info->hw_queue != info->control.vif->cab_queue)))
		return -1;

	/*
	 * IWL_MVM_OFFCHANNEL_QUEUE is used for ROC packets that can be used
	 * in 2 different types of vifs, P2P & STATION. P2P uses the offchannel
	 * queue. STATION (HS2.0) uses the auxiliary context of the FW,
	 * and hence needs to be sent on the aux queue
	 */
	if (IEEE80211_SKB_CB(skb)->hw_queue == IWL_MVM_OFFCHANNEL_QUEUE &&
	    info->control.vif->type == NL80211_IFTYPE_STATION)
		IEEE80211_SKB_CB(skb)->hw_queue = mvm->aux_queue;

	/*
	 * If the interface on which frame is sent is the P2P_DEVICE
	 * or an AP/GO interface use the broadcast station associated
	 * with it; otherwise use the AUX station.
	 */
	if (info->control.vif &&
	    (info->control.vif->type == NL80211_IFTYPE_P2P_DEVICE ||
	     info->control.vif->type == NL80211_IFTYPE_AP)) {
		struct iwl_mvm_vif *mvmvif =
			iwl_mvm_vif_from_mac80211(info->control.vif);
		sta_id = mvmvif->bcast_sta.sta_id;
	} else {
		sta_id = mvm->aux_sta.sta_id;
	}

	IWL_DEBUG_TX(mvm, "station Id %d, queue=%d\n", sta_id, info->hw_queue);

	dev_cmd = iwl_mvm_set_tx_params(mvm, skb, NULL, sta_id);
	if (!dev_cmd)
		return -1;

	/* From now on, we cannot access info->control */
	tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;

	/* Copy MAC header from skb into command buffer */
	memcpy(tx_cmd->hdr, hdr, ieee80211_hdrlen(hdr->frame_control));

	if (iwl_trans_tx(mvm->trans, skb, dev_cmd, info->hw_queue)) {
		iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
		return -1;
	}

	return 0;
}

/*
 * Sets the fields in the Tx cmd that are crypto related
 */
int iwl_mvm_tx_skb(struct iwl_mvm *mvm, struct sk_buff *skb,
		   struct ieee80211_sta *sta)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct iwl_mvm_sta *mvmsta;
	struct iwl_device_cmd *dev_cmd;
	struct iwl_tx_cmd *tx_cmd;
	__le16 fc;
	u16 seq_number = 0;
	u8 tid = IWL_MAX_TID_COUNT;
	u8 txq_id = info->hw_queue;
	bool is_data_qos = false, is_ampdu = false;

	mvmsta = iwl_mvm_sta_from_mac80211(sta);
	fc = hdr->frame_control;

	if (WARN_ON_ONCE(!mvmsta))
		return -1;

	if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_STATION_COUNT))
		return -1;

	dev_cmd = iwl_mvm_set_tx_params(mvm, skb, sta, mvmsta->sta_id);
	if (!dev_cmd)
		goto drop;

	tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
	/* From now on, we cannot access info->control */

	/*
	 * we handle that entirely ourselves -- for uAPSD the firmware
	 * will always send a notification, and for PS-Poll responses
	 * we'll notify mac80211 when getting frame status
	 */
	info->flags &= ~IEEE80211_TX_STATUS_EOSP;

	spin_lock(&mvmsta->lock);

	if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) {
		u8 *qc = NULL;
		qc = ieee80211_get_qos_ctl(hdr);
		tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
		if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
			goto drop_unlock_sta;

		seq_number = mvmsta->tid_data[tid].seq_number;
		seq_number &= IEEE80211_SCTL_SEQ;
		hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
		hdr->seq_ctrl |= cpu_to_le16(seq_number);
		is_data_qos = true;
		is_ampdu = info->flags & IEEE80211_TX_CTL_AMPDU;
	}

	/* Copy MAC header from skb into command buffer */
	memcpy(tx_cmd->hdr, hdr, ieee80211_hdrlen(fc));

	WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM);

	if (is_ampdu) {
		if (WARN_ON_ONCE(mvmsta->tid_data[tid].state != IWL_AGG_ON))
			goto drop_unlock_sta;
		txq_id = mvmsta->tid_data[tid].txq_id;
	}

	IWL_DEBUG_TX(mvm, "TX to [%d|%d] Q:%d - seq: 0x%x\n", mvmsta->sta_id,
		     tid, txq_id, IEEE80211_SEQ_TO_SN(seq_number));

	if (iwl_trans_tx(mvm->trans, skb, dev_cmd, txq_id))
		goto drop_unlock_sta;

	if (is_data_qos && !ieee80211_has_morefrags(fc))
		mvmsta->tid_data[tid].seq_number = seq_number + 0x10;

	spin_unlock(&mvmsta->lock);

	if (txq_id < mvm->first_agg_queue)
		atomic_inc(&mvm->pending_frames[mvmsta->sta_id]);

	return 0;

drop_unlock_sta:
	iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
	spin_unlock(&mvmsta->lock);
drop:
	return -1;
}

static void iwl_mvm_check_ratid_empty(struct iwl_mvm *mvm,
				      struct ieee80211_sta *sta, u8 tid)
{
	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
	struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
	struct ieee80211_vif *vif = mvmsta->vif;

	lockdep_assert_held(&mvmsta->lock);

	if ((tid_data->state == IWL_AGG_ON ||
	     tid_data->state == IWL_EMPTYING_HW_QUEUE_DELBA) &&
	    iwl_mvm_tid_queued(tid_data) == 0) {
		/*
		 * Now that this aggregation queue is empty tell mac80211 so it
		 * knows we no longer have frames buffered for the station on
		 * this TID (for the TIM bitmap calculation.)
		 */
		ieee80211_sta_set_buffered(sta, tid, false);
	}

	if (tid_data->ssn != tid_data->next_reclaimed)
		return;

	switch (tid_data->state) {
	case IWL_EMPTYING_HW_QUEUE_ADDBA:
		IWL_DEBUG_TX_QUEUES(mvm,
				    "Can continue addBA flow ssn = next_recl = %d\n",
				    tid_data->next_reclaimed);
		tid_data->state = IWL_AGG_STARTING;
		ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
		break;

	case IWL_EMPTYING_HW_QUEUE_DELBA:
		IWL_DEBUG_TX_QUEUES(mvm,
				    "Can continue DELBA flow ssn = next_recl = %d\n",
				    tid_data->next_reclaimed);
		iwl_trans_txq_disable(mvm->trans, tid_data->txq_id);
		tid_data->state = IWL_AGG_OFF;
		/*
		 * we can't hold the mutex - but since we are after a sequence
		 * point (call to iwl_trans_txq_disable), so we don't even need
		 * a memory barrier.
		 */
		mvm->queue_to_mac80211[tid_data->txq_id] =
					IWL_INVALID_MAC80211_QUEUE;
		ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
		break;

	default:
		break;
	}
}

#ifdef CONFIG_IWLWIFI_DEBUG
const char *iwl_mvm_get_tx_fail_reason(u32 status)
{
#define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
#define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x

	switch (status & TX_STATUS_MSK) {
	case TX_STATUS_SUCCESS:
		return "SUCCESS";
	TX_STATUS_POSTPONE(DELAY);
	TX_STATUS_POSTPONE(FEW_BYTES);
	TX_STATUS_POSTPONE(BT_PRIO);
	TX_STATUS_POSTPONE(QUIET_PERIOD);
	TX_STATUS_POSTPONE(CALC_TTAK);
	TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
	TX_STATUS_FAIL(SHORT_LIMIT);
	TX_STATUS_FAIL(LONG_LIMIT);
	TX_STATUS_FAIL(UNDERRUN);
	TX_STATUS_FAIL(DRAIN_FLOW);
	TX_STATUS_FAIL(RFKILL_FLUSH);
	TX_STATUS_FAIL(LIFE_EXPIRE);
	TX_STATUS_FAIL(DEST_PS);
	TX_STATUS_FAIL(HOST_ABORTED);
	TX_STATUS_FAIL(BT_RETRY);
	TX_STATUS_FAIL(STA_INVALID);
	TX_STATUS_FAIL(FRAG_DROPPED);
	TX_STATUS_FAIL(TID_DISABLE);
	TX_STATUS_FAIL(FIFO_FLUSHED);
	TX_STATUS_FAIL(SMALL_CF_POLL);
	TX_STATUS_FAIL(FW_DROP);
	TX_STATUS_FAIL(STA_COLOR_MISMATCH);
	}

	return "UNKNOWN";

#undef TX_STATUS_FAIL
#undef TX_STATUS_POSTPONE
}
#endif /* CONFIG_IWLWIFI_DEBUG */

void iwl_mvm_hwrate_to_tx_rate(u32 rate_n_flags,
			       enum ieee80211_band band,
			       struct ieee80211_tx_rate *r)
{
	if (rate_n_flags & RATE_HT_MCS_GF_MSK)
		r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
	switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
	case RATE_MCS_CHAN_WIDTH_20:
		break;
	case RATE_MCS_CHAN_WIDTH_40:
		r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
		break;
	case RATE_MCS_CHAN_WIDTH_80:
		r->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH;
		break;
	case RATE_MCS_CHAN_WIDTH_160:
		r->flags |= IEEE80211_TX_RC_160_MHZ_WIDTH;
		break;
	}
	if (rate_n_flags & RATE_MCS_SGI_MSK)
		r->flags |= IEEE80211_TX_RC_SHORT_GI;
	if (rate_n_flags & RATE_MCS_HT_MSK) {
		r->flags |= IEEE80211_TX_RC_MCS;
		r->idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
	} else if (rate_n_flags & RATE_MCS_VHT_MSK) {
		ieee80211_rate_set_vht(
			r, rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK,
			((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
						RATE_VHT_MCS_NSS_POS) + 1);
		r->flags |= IEEE80211_TX_RC_VHT_MCS;
	} else {
		r->idx = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
							     band);
	}
}

/**
 * translate ucode response to mac80211 tx status control values
 */
static void iwl_mvm_hwrate_to_tx_status(u32 rate_n_flags,
					struct ieee80211_tx_info *info)
{
	struct ieee80211_tx_rate *r = &info->status.rates[0];

	info->status.antenna =
		((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
	iwl_mvm_hwrate_to_tx_rate(rate_n_flags, info->band, r);
}

static void iwl_mvm_rx_tx_cmd_single(struct iwl_mvm *mvm,
				     struct iwl_rx_packet *pkt)
{
	struct ieee80211_sta *sta;
	u16 sequence = le16_to_cpu(pkt->hdr.sequence);
	int txq_id = SEQ_TO_QUEUE(sequence);
	struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
	int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid);
	int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid);
	u32 status = le16_to_cpu(tx_resp->status.status);
	u16 ssn = iwl_mvm_get_scd_ssn(tx_resp);
	struct iwl_mvm_sta *mvmsta;
	struct sk_buff_head skbs;
	u8 skb_freed = 0;
	u16 next_reclaimed, seq_ctl;

	__skb_queue_head_init(&skbs);

	seq_ctl = le16_to_cpu(tx_resp->seq_ctl);

	/* we can free until ssn % q.n_bd not inclusive */
	iwl_trans_reclaim(mvm->trans, txq_id, ssn, &skbs);

	while (!skb_queue_empty(&skbs)) {
		struct sk_buff *skb = __skb_dequeue(&skbs);
		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

		skb_freed++;

		iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);

		memset(&info->status, 0, sizeof(info->status));

		info->flags &= ~IEEE80211_TX_CTL_AMPDU;

		/* inform mac80211 about what happened with the frame */
		switch (status & TX_STATUS_MSK) {
		case TX_STATUS_SUCCESS:
		case TX_STATUS_DIRECT_DONE:
			info->flags |= IEEE80211_TX_STAT_ACK;
			break;
		case TX_STATUS_FAIL_DEST_PS:
			info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
			break;
		default:
			break;
		}

		info->status.rates[0].count = tx_resp->failure_frame + 1;
		iwl_mvm_hwrate_to_tx_status(le32_to_cpu(tx_resp->initial_rate),
					    info);

		/* Single frame failure in an AMPDU queue => send BAR */
		if (txq_id >= mvm->first_agg_queue &&
		    !(info->flags & IEEE80211_TX_STAT_ACK))
			info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;

		/* W/A FW bug: seq_ctl is wrong when the status isn't success */
		if (status != TX_STATUS_SUCCESS) {
			struct ieee80211_hdr *hdr = (void *)skb->data;
			seq_ctl = le16_to_cpu(hdr->seq_ctrl);
		}

		BUILD_BUG_ON(ARRAY_SIZE(info->status.status_driver_data) < 1);
		info->status.status_driver_data[0] =
				(void *)(uintptr_t)tx_resp->reduced_tpc;

		ieee80211_tx_status(mvm->hw, skb);
	}

	if (txq_id >= mvm->first_agg_queue) {
		/* If this is an aggregation queue, we use the ssn since:
		 * ssn = wifi seq_num % 256.
		 * The seq_ctl is the sequence control of the packet to which
		 * this Tx response relates. But if there is a hole in the
		 * bitmap of the BA we received, this Tx response may allow to
		 * reclaim the hole and all the subsequent packets that were
		 * already acked. In that case, seq_ctl != ssn, and the next
		 * packet to be reclaimed will be ssn and not seq_ctl. In that
		 * case, several packets will be reclaimed even if
		 * frame_count = 1.
		 *
		 * The ssn is the index (% 256) of the latest packet that has
		 * treated (acked / dropped) + 1.
		 */
		next_reclaimed = ssn;
	} else {
		/* The next packet to be reclaimed is the one after this one */
		next_reclaimed = IEEE80211_SEQ_TO_SN(seq_ctl + 0x10);
	}

	IWL_DEBUG_TX_REPLY(mvm,
			   "TXQ %d status %s (0x%08x)\n",
			   txq_id, iwl_mvm_get_tx_fail_reason(status), status);

	IWL_DEBUG_TX_REPLY(mvm,
			   "\t\t\t\tinitial_rate 0x%x retries %d, idx=%d ssn=%d next_reclaimed=0x%x seq_ctl=0x%x\n",
			   le32_to_cpu(tx_resp->initial_rate),
			   tx_resp->failure_frame, SEQ_TO_INDEX(sequence),
			   ssn, next_reclaimed, seq_ctl);

	rcu_read_lock();

	sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
	/*
	 * sta can't be NULL otherwise it'd mean that the sta has been freed in
	 * the firmware while we still have packets for it in the Tx queues.
	 */
	if (WARN_ON_ONCE(!sta))
		goto out;

	if (!IS_ERR(sta)) {
		mvmsta = iwl_mvm_sta_from_mac80211(sta);

		if (tid != IWL_TID_NON_QOS) {
			struct iwl_mvm_tid_data *tid_data =
				&mvmsta->tid_data[tid];

			spin_lock_bh(&mvmsta->lock);
			tid_data->next_reclaimed = next_reclaimed;
			IWL_DEBUG_TX_REPLY(mvm, "Next reclaimed packet:%d\n",
					   next_reclaimed);
			iwl_mvm_check_ratid_empty(mvm, sta, tid);
			spin_unlock_bh(&mvmsta->lock);
		}

		if (mvmsta->next_status_eosp) {
			mvmsta->next_status_eosp = false;
			ieee80211_sta_eosp(sta);
		}
	} else {
		mvmsta = NULL;
	}

	/*
	 * If the txq is not an AMPDU queue, there is no chance we freed
	 * several skbs. Check that out...
	 */
	if (txq_id >= mvm->first_agg_queue)
		goto out;

	/* We can't free more than one frame at once on a shared queue */
	WARN_ON(skb_freed > 1);

	/* If we have still frames for this STA nothing to do here */
	if (!atomic_sub_and_test(skb_freed, &mvm->pending_frames[sta_id]))
		goto out;

	if (mvmsta && mvmsta->vif->type == NL80211_IFTYPE_AP) {

		/*
		 * If there are no pending frames for this STA and
		 * the tx to this station is not disabled, notify
		 * mac80211 that this station can now wake up in its
		 * STA table.
		 * If mvmsta is not NULL, sta is valid.
		 */

		spin_lock_bh(&mvmsta->lock);

		if (!mvmsta->disable_tx)
			ieee80211_sta_block_awake(mvm->hw, sta, false);

		spin_unlock_bh(&mvmsta->lock);
	}

	if (PTR_ERR(sta) == -EBUSY || PTR_ERR(sta) == -ENOENT) {
		/*
		 * We are draining and this was the last packet - pre_rcu_remove
		 * has been called already. We might be after the
		 * synchronize_net already.
		 * Don't rely on iwl_mvm_rm_sta to see the empty Tx queues.
		 */
		set_bit(sta_id, mvm->sta_drained);
		schedule_work(&mvm->sta_drained_wk);
	}

out:
	rcu_read_unlock();
}

#ifdef CONFIG_IWLWIFI_DEBUG
#define AGG_TX_STATE_(x) case AGG_TX_STATE_ ## x: return #x
static const char *iwl_get_agg_tx_status(u16 status)
{
	switch (status & AGG_TX_STATE_STATUS_MSK) {
	AGG_TX_STATE_(TRANSMITTED);
	AGG_TX_STATE_(UNDERRUN);
	AGG_TX_STATE_(BT_PRIO);
	AGG_TX_STATE_(FEW_BYTES);
	AGG_TX_STATE_(ABORT);
	AGG_TX_STATE_(LAST_SENT_TTL);
	AGG_TX_STATE_(LAST_SENT_TRY_CNT);
	AGG_TX_STATE_(LAST_SENT_BT_KILL);
	AGG_TX_STATE_(SCD_QUERY);
	AGG_TX_STATE_(TEST_BAD_CRC32);
	AGG_TX_STATE_(RESPONSE);
	AGG_TX_STATE_(DUMP_TX);
	AGG_TX_STATE_(DELAY_TX);
	}

	return "UNKNOWN";
}

static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm,
				      struct iwl_rx_packet *pkt)
{
	struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
	struct agg_tx_status *frame_status = &tx_resp->status;
	int i;

	for (i = 0; i < tx_resp->frame_count; i++) {
		u16 fstatus = le16_to_cpu(frame_status[i].status);

		IWL_DEBUG_TX_REPLY(mvm,
				   "status %s (0x%04x), try-count (%d) seq (0x%x)\n",
				   iwl_get_agg_tx_status(fstatus),
				   fstatus & AGG_TX_STATE_STATUS_MSK,
				   (fstatus & AGG_TX_STATE_TRY_CNT_MSK) >>
					AGG_TX_STATE_TRY_CNT_POS,
				   le16_to_cpu(frame_status[i].sequence));
	}
}
#else
static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm,
				      struct iwl_rx_packet *pkt)
{}
#endif /* CONFIG_IWLWIFI_DEBUG */

static void iwl_mvm_rx_tx_cmd_agg(struct iwl_mvm *mvm,
				  struct iwl_rx_packet *pkt)
{
	struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
	int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid);
	int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid);
	u16 sequence = le16_to_cpu(pkt->hdr.sequence);
	struct ieee80211_sta *sta;

	if (WARN_ON_ONCE(SEQ_TO_QUEUE(sequence) < mvm->first_agg_queue))
		return;

	if (WARN_ON_ONCE(tid == IWL_TID_NON_QOS))
		return;

	iwl_mvm_rx_tx_cmd_agg_dbg(mvm, pkt);

	rcu_read_lock();

	sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);

	if (!WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) {
		struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
		mvmsta->tid_data[tid].rate_n_flags =
			le32_to_cpu(tx_resp->initial_rate);
		mvmsta->tid_data[tid].reduced_tpc = tx_resp->reduced_tpc;
	}

	rcu_read_unlock();
}

int iwl_mvm_rx_tx_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
		      struct iwl_device_cmd *cmd)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;

	if (tx_resp->frame_count == 1)
		iwl_mvm_rx_tx_cmd_single(mvm, pkt);
	else
		iwl_mvm_rx_tx_cmd_agg(mvm, pkt);

	return 0;
}

int iwl_mvm_rx_ba_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
			struct iwl_device_cmd *cmd)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	struct iwl_mvm_ba_notif *ba_notif = (void *)pkt->data;
	struct sk_buff_head reclaimed_skbs;
	struct iwl_mvm_tid_data *tid_data;
	struct ieee80211_sta *sta;
	struct iwl_mvm_sta *mvmsta;
	struct sk_buff *skb;
	int sta_id, tid, freed;
	/* "flow" corresponds to Tx queue */
	u16 scd_flow = le16_to_cpu(ba_notif->scd_flow);
	/* "ssn" is start of block-ack Tx window, corresponds to index
	 * (in Tx queue's circular buffer) of first TFD/frame in window */
	u16 ba_resp_scd_ssn = le16_to_cpu(ba_notif->scd_ssn);

	sta_id = ba_notif->sta_id;
	tid = ba_notif->tid;

	rcu_read_lock();

	sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);

	/* Reclaiming frames for a station that has been deleted ? */
	if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) {
		rcu_read_unlock();
		return 0;
	}

	mvmsta = iwl_mvm_sta_from_mac80211(sta);
	tid_data = &mvmsta->tid_data[tid];

	if (WARN_ONCE(tid_data->txq_id != scd_flow, "Q %d, tid %d, flow %d",
		      tid_data->txq_id, tid, scd_flow)) {
		rcu_read_unlock();
		return 0;
	}

	spin_lock_bh(&mvmsta->lock);

	__skb_queue_head_init(&reclaimed_skbs);

	/*
	 * Release all TFDs before the SSN, i.e. all TFDs in front of
	 * block-ack window (we assume that they've been successfully
	 * transmitted ... if not, it's too late anyway).
	 */
	iwl_trans_reclaim(mvm->trans, scd_flow, ba_resp_scd_ssn,
			  &reclaimed_skbs);

	IWL_DEBUG_TX_REPLY(mvm,
			   "BA_NOTIFICATION Received from %pM, sta_id = %d\n",
			   (u8 *)&ba_notif->sta_addr_lo32,
			   ba_notif->sta_id);
	IWL_DEBUG_TX_REPLY(mvm,
			   "TID = %d, SeqCtl = %d, bitmap = 0x%llx, scd_flow = %d, scd_ssn = %d sent:%d, acked:%d\n",
			   ba_notif->tid, le16_to_cpu(ba_notif->seq_ctl),
			   (unsigned long long)le64_to_cpu(ba_notif->bitmap),
			   scd_flow, ba_resp_scd_ssn, ba_notif->txed,
			   ba_notif->txed_2_done);

	tid_data->next_reclaimed = ba_resp_scd_ssn;

	iwl_mvm_check_ratid_empty(mvm, sta, tid);

	freed = 0;

	skb_queue_walk(&reclaimed_skbs, skb) {
		struct ieee80211_hdr *hdr = (void *)skb->data;
		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

		if (ieee80211_is_data_qos(hdr->frame_control))
			freed++;
		else
			WARN_ON_ONCE(1);

		iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);

		memset(&info->status, 0, sizeof(info->status));
		/* Packet was transmitted successfully, failures come as single
		 * frames because before failing a frame the firmware transmits
		 * it without aggregation at least once.
		 */
		info->flags |= IEEE80211_TX_STAT_ACK;

		if (freed == 1) {
			/* this is the first skb we deliver in this batch */
			/* put the rate scaling data there */
			info->flags |= IEEE80211_TX_STAT_AMPDU;
			info->status.ampdu_ack_len = ba_notif->txed_2_done;
			info->status.ampdu_len = ba_notif->txed;
			iwl_mvm_hwrate_to_tx_status(tid_data->rate_n_flags,
						    info);
			info->status.status_driver_data[0] =
				(void *)(uintptr_t)tid_data->reduced_tpc;
		}
	}

	spin_unlock_bh(&mvmsta->lock);

	rcu_read_unlock();

	while (!skb_queue_empty(&reclaimed_skbs)) {
		skb = __skb_dequeue(&reclaimed_skbs);
		ieee80211_tx_status(mvm->hw, skb);
	}

	return 0;
}

int iwl_mvm_flush_tx_path(struct iwl_mvm *mvm, u32 tfd_msk, bool sync)
{
	int ret;
	struct iwl_tx_path_flush_cmd flush_cmd = {
		.queues_ctl = cpu_to_le32(tfd_msk),
		.flush_ctl = cpu_to_le16(DUMP_TX_FIFO_FLUSH),
	};

	u32 flags = sync ? 0 : CMD_ASYNC;

	ret = iwl_mvm_send_cmd_pdu(mvm, TXPATH_FLUSH, flags,
				   sizeof(flush_cmd), &flush_cmd);
	if (ret)
		IWL_ERR(mvm, "Failed to send flush command (%d)\n", ret);
	return ret;
}