text: /******************************************************************************
   *
   * 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.
   * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
   * Copyright(c) 2016 - 2017 Intel Deutschland 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) 2012 - 2014 Intel Corporation. All rights reserved.
   * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
   * Copyright(c) 2016 - 2017 Intel Deutschland 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 <linux/ieee80211.h>
  #include <linux/etherdevice.h>
  #include <linux/tcp.h>
  #include <net/ip.h>
  #include <net/ipv6.h>
  
  #include "iwl-trans.h"
  #include "iwl-eeprom-parse.h"
  #include "mvm.h"
  #include "sta.h"
  
  static void
  iwl_mvm_bar_check_trigger(struct iwl_mvm *mvm, const u8 *addr,
  			  u16 tid, u16 ssn)
  {
  	struct iwl_fw_dbg_trigger_tlv *trig;
  	struct iwl_fw_dbg_trigger_ba *ba_trig;
  
  	if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_BA))
  		return;
  
  	trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_BA);
  	ba_trig = (void *)trig->data;
  
  	if (!iwl_fw_dbg_trigger_check_stop(&mvm->fwrt, NULL, trig))
  		return;
  
  	if (!(le16_to_cpu(ba_trig->tx_bar) & BIT(tid)))
  		return;
  
  	iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
  				"BAR sent to %pM, tid %d, ssn %d",
  				addr, tid, ssn);
  }
  
  #define OPT_HDR(type, skb, off) \
  	(type *)(skb_network_header(skb) + (off))
  
  static u16 iwl_mvm_tx_csum(struct iwl_mvm *mvm, struct sk_buff *skb,
  			   struct ieee80211_hdr *hdr,
  			   struct ieee80211_tx_info *info,
  			   u16 offload_assist)
  {
  #if IS_ENABLED(CONFIG_INET)
  	u16 mh_len = ieee80211_hdrlen(hdr->frame_control);
  	u8 protocol = 0;
  
  	/*
  	 * Do not compute checksum if already computed or if transport will
  	 * compute it
  	 */
  	if (skb->ip_summed != CHECKSUM_PARTIAL || IWL_MVM_SW_TX_CSUM_OFFLOAD)
  		goto out;
  
  	/* We do not expect to be requested to csum stuff we do not support */
  	if (WARN_ONCE(!(mvm->hw->netdev_features & IWL_TX_CSUM_NETIF_FLAGS) ||
  		      (skb->protocol != htons(ETH_P_IP) &&
  		       skb->protocol != htons(ETH_P_IPV6)),
  		      "No support for requested checksum\n")) {
  		skb_checksum_help(skb);
  		goto out;
  	}
  
  	if (skb->protocol == htons(ETH_P_IP)) {
  		protocol = ip_hdr(skb)->protocol;
  	} else {
  #if IS_ENABLED(CONFIG_IPV6)
  		struct ipv6hdr *ipv6h =
  			(struct ipv6hdr *)skb_network_header(skb);
  		unsigned int off = sizeof(*ipv6h);
  
  		protocol = ipv6h->nexthdr;
  		while (protocol != NEXTHDR_NONE && ipv6_ext_hdr(protocol)) {
  			struct ipv6_opt_hdr *hp;
  
  			/* only supported extension headers */
  			if (protocol != NEXTHDR_ROUTING &&
  			    protocol != NEXTHDR_HOP &&
  			    protocol != NEXTHDR_DEST) {
  				skb_checksum_help(skb);
  				goto out;
  			}
  
  			hp = OPT_HDR(struct ipv6_opt_hdr, skb, off);
  			protocol = hp->nexthdr;
  			off += ipv6_optlen(hp);
  		}
  		/* if we get here - protocol now should be TCP/UDP */
  #endif
  	}
  
  	if (protocol != IPPROTO_TCP && protocol != IPPROTO_UDP) {
  		WARN_ON_ONCE(1);
  		skb_checksum_help(skb);
  		goto out;
  	}
  
  	/* enable L4 csum */
  	offload_assist |= BIT(TX_CMD_OFFLD_L4_EN);
  
  	/*
  	 * Set offset to IP header (snap).
  	 * We don't support tunneling so no need to take care of inner header.
  	 * Size is in words.
  	 */
  	offload_assist |= (4 << TX_CMD_OFFLD_IP_HDR);
  
  	/* Do IPv4 csum for AMSDU only (no IP csum for Ipv6) */
  	if (skb->protocol == htons(ETH_P_IP) &&
  	    (offload_assist & BIT(TX_CMD_OFFLD_AMSDU))) {
  		ip_hdr(skb)->check = 0;
  		offload_assist |= BIT(TX_CMD_OFFLD_L3_EN);
  	}
  
  	/* reset UDP/TCP header csum */
  	if (protocol == IPPROTO_TCP)
  		tcp_hdr(skb)->check = 0;
  	else
  		udp_hdr(skb)->check = 0;
  
  	/*
  	 * mac header len should include IV, size is in words unless
  	 * the IV is added by the firmware like in WEP.
  	 * In new Tx API, the IV is always added by the firmware.
  	 */
  	if (!iwl_mvm_has_new_tx_api(mvm) && info->control.hw_key &&
  	    info->control.hw_key->cipher != WLAN_CIPHER_SUITE_WEP40 &&
  	    info->control.hw_key->cipher != WLAN_CIPHER_SUITE_WEP104)
  		mh_len += info->control.hw_key->iv_len;
  	mh_len /= 2;
  	offload_assist |= mh_len << TX_CMD_OFFLD_MH_SIZE;
  
  out:
  #endif
  	return offload_assist;
  }
  
  /*
   * Sets most of the Tx cmd's fields
   */
  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;
  	u16 offload_assist = 0;
  	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;
  
  	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;
  		if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
  			offload_assist |= BIT(TX_CMD_OFFLD_AMSDU);
  	} else if (ieee80211_is_back_req(fc)) {
  		struct ieee80211_bar *bar = (void *)skb->data;
  		u16 control = le16_to_cpu(bar->control);
  		u16 ssn = le16_to_cpu(bar->start_seq_num);
  
  		tx_flags |= TX_CMD_FLG_ACK | TX_CMD_FLG_BAR;
  		tx_cmd->tid_tspec = (control &
  				     IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
  			IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
  		WARN_ON_ONCE(tx_cmd->tid_tspec >= IWL_MAX_TID_COUNT);
  		iwl_mvm_bar_check_trigger(mvm, bar->ra, tx_cmd->tid_tspec,
  					  ssn);
  	} 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;
  	}
  
  	/* Default to 0 (BE) when tid_spec is set to IWL_TID_NON_QOS */
  	if (tx_cmd->tid_tspec < IWL_MAX_TID_COUNT)
  		ac = tid_to_mac80211_ac[tx_cmd->tid_tspec];
  	else
  		ac = tid_to_mac80211_ac[0];
  
  	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(PM_FRAME_ASSOC);
  		else if (ieee80211_is_action(fc))
  			tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_NONE);
  		else
  			tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_MGMT);
  
  		/* 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(PM_FRAME_MGMT);
  	} else {
  		tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_NONE);
  	}
  
  	if (ieee80211_is_data(fc) && len > mvm->rts_threshold &&
  	    !is_multicast_ether_addr(ieee80211_get_DA(hdr)))
  		tx_flags |= TX_CMD_FLG_PROT_REQUIRE;
  
  	if (fw_has_capa(&mvm->fw->ucode_capa,
  			IWL_UCODE_TLV_CAPA_TXPOWER_INSERTION_SUPPORT) &&
  	    ieee80211_action_contains_tpc(skb))
  		tx_flags |= TX_CMD_FLG_WRITE_TX_POWER;
  
  	tx_cmd->tx_flags = cpu_to_le32(tx_flags);
  	/* Total # bytes to be transmitted - PCIe code will adjust for A-MSDU */
  	tx_cmd->len = cpu_to_le16((u16)skb->len);
  	tx_cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
  	tx_cmd->sta_id = sta_id;
  
  	/* padding is inserted later in transport */
  	if (ieee80211_hdrlen(fc) % 4 &&
  	    !(offload_assist & BIT(TX_CMD_OFFLD_AMSDU)))
  		offload_assist |= BIT(TX_CMD_OFFLD_PAD);
  
  	tx_cmd->offload_assist |=
  		cpu_to_le16(iwl_mvm_tx_csum(mvm, skb, hdr, info,
  					    offload_assist));
  }
  
  static u32 iwl_mvm_get_tx_rate(struct iwl_mvm *mvm,
  			       struct ieee80211_tx_info *info,
  			       struct ieee80211_sta *sta)
  {
  	int rate_idx;
  	u8 rate_plcp;
  	u32 rate_flags;
  
  	/* 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 (flags:0x%x/mcs:%d) for a non data frame\n",
  		  info->control.rates[0].flags,
  		  info->control.rates[0].idx);
  
  	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 == NL80211_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);
  
  	if (info->band == NL80211_BAND_2GHZ &&
  	    !iwl_mvm_bt_coex_is_shared_ant_avail(mvm))
  		rate_flags = mvm->cfg->non_shared_ant << 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;
  
  	return (u32)rate_plcp | rate_flags;
  }
  
  /*
   * Sets the fields in the Tx cmd that are rate related
   */
  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)
  {
  	/* 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
  	 */
  
  	if (ieee80211_is_data(fc) && sta) {
  		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);
  	}
  
  	mvm->mgmt_last_antenna_idx =
  		iwl_mvm_next_antenna(mvm, iwl_mvm_get_valid_tx_ant(mvm),
  				     mvm->mgmt_last_antenna_idx);
  
  	/* Set the rate in the TX cmd */
  	tx_cmd->rate_n_flags = cpu_to_le32(iwl_mvm_get_tx_rate(mvm, info, sta));
  }
  
  static inline void iwl_mvm_set_tx_cmd_pn(struct ieee80211_tx_info *info,
  					 u8 *crypto_hdr)
  {
  	struct ieee80211_key_conf *keyconf = info->control.hw_key;
  	u64 pn;
  
  	pn = atomic64_inc_return(&keyconf->tx_pn);
  	crypto_hdr[0] = pn;
  	crypto_hdr[2] = 0;
  	crypto_hdr[3] = 0x20 | (keyconf->keyidx << 6);
  	crypto_hdr[1] = pn >> 8;
  	crypto_hdr[4] = pn >> 16;
  	crypto_hdr[5] = pn >> 24;
  	crypto_hdr[6] = pn >> 32;
  	crypto_hdr[7] = pn >> 40;
  }
  
  /*
   * 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,
  				      int hdrlen)
  {
  	struct ieee80211_key_conf *keyconf = info->control.hw_key;
  	u8 *crypto_hdr = skb_frag->data + hdrlen;
  	enum iwl_tx_cmd_sec_ctrl type = TX_CMD_SEC_CCM;
  	u64 pn;
  
  	switch (keyconf->cipher) {
  	case WLAN_CIPHER_SUITE_CCMP:
  		iwl_mvm_set_tx_cmd_ccmp(info, tx_cmd);
  		iwl_mvm_set_tx_cmd_pn(info, crypto_hdr);
  		break;
  
  	case WLAN_CIPHER_SUITE_TKIP:
  		tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
  		pn = atomic64_inc_return(&keyconf->tx_pn);
  		ieee80211_tkip_add_iv(crypto_hdr, keyconf, pn);
  		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;
  	case WLAN_CIPHER_SUITE_GCMP:
  	case WLAN_CIPHER_SUITE_GCMP_256:
  		type = TX_CMD_SEC_GCMP;
  		/* Fall through */
  	case WLAN_CIPHER_SUITE_CCMP_256:
  		/* TODO: Taking the key from the table might introduce a race
  		 * when PTK rekeying is done, having an old packets with a PN
  		 * based on the old key but the message encrypted with a new
  		 * one.
  		 * Need to handle this.
  		 */
  		tx_cmd->sec_ctl |= type | TX_CMD_SEC_KEY_FROM_TABLE;
  		tx_cmd->key[0] = keyconf->hw_key_idx;
  		iwl_mvm_set_tx_cmd_pn(info, crypto_hdr);
  		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_tx_info *info, int hdrlen,
  		      struct ieee80211_sta *sta, u8 sta_id)
  {
  	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
  	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;
  
  	/* Make sure we zero enough of dev_cmd */
  	BUILD_BUG_ON(sizeof(struct iwl_tx_cmd_gen2) > sizeof(*tx_cmd));
  	BUILD_BUG_ON(sizeof(struct iwl_tx_cmd_gen3) > sizeof(*tx_cmd));
  
  	memset(dev_cmd, 0, sizeof(dev_cmd->hdr) + sizeof(*tx_cmd));
  	dev_cmd->hdr.cmd = TX_CMD;
  
  	if (iwl_mvm_has_new_tx_api(mvm)) {
  		u16 offload_assist = 0;
  		u32 rate_n_flags = 0;
  		u16 flags = 0;
  
  		if (ieee80211_is_data_qos(hdr->frame_control)) {
  			u8 *qc = ieee80211_get_qos_ctl(hdr);
  
  			if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
  				offload_assist |= BIT(TX_CMD_OFFLD_AMSDU);
  		}
  
  		offload_assist = iwl_mvm_tx_csum(mvm, skb, hdr, info,
  						 offload_assist);
  
  		/* padding is inserted later in transport */
  		if (ieee80211_hdrlen(hdr->frame_control) % 4 &&
  		    !(offload_assist & BIT(TX_CMD_OFFLD_AMSDU)))
  			offload_assist |= BIT(TX_CMD_OFFLD_PAD);
  
  		if (!info->control.hw_key)
  			flags |= IWL_TX_FLAGS_ENCRYPT_DIS;
  
  		/* For data packets rate info comes from the fw */
  		if (!(ieee80211_is_data(hdr->frame_control) && sta)) {
  			flags |= IWL_TX_FLAGS_CMD_RATE;
  			rate_n_flags = iwl_mvm_get_tx_rate(mvm, info, sta);
  		}
  
  		if (mvm->trans->cfg->device_family >=
  		    IWL_DEVICE_FAMILY_22560) {
  			struct iwl_tx_cmd_gen3 *cmd = (void *)dev_cmd->payload;
  
  			cmd->offload_assist |= cpu_to_le32(offload_assist);
  
  			/* Total # bytes to be transmitted */
  			cmd->len = cpu_to_le16((u16)skb->len);
  
  			/* Copy MAC header from skb into command buffer */
  			memcpy(cmd->hdr, hdr, hdrlen);
  
  			cmd->flags = cpu_to_le16(flags);
  			cmd->rate_n_flags = cpu_to_le32(rate_n_flags);
  		} else {
  			struct iwl_tx_cmd_gen2 *cmd = (void *)dev_cmd->payload;
  
  			cmd->offload_assist |= cpu_to_le16(offload_assist);
  
  			/* Total # bytes to be transmitted */
  			cmd->len = cpu_to_le16((u16)skb->len);
  
  			/* Copy MAC header from skb into command buffer */
  			memcpy(cmd->hdr, hdr, hdrlen);
  
  			cmd->flags = cpu_to_le32(flags);
  			cmd->rate_n_flags = cpu_to_le32(rate_n_flags);
  		}
  		goto out;
  	}
  
  	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, hdrlen);
  
  	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);
  
  	/* Copy MAC header from skb into command buffer */
  	memcpy(tx_cmd->hdr, hdr, hdrlen);
  
  out:
  	return dev_cmd;
  }
  
  static void iwl_mvm_skb_prepare_status(struct sk_buff *skb,
  				       struct iwl_device_cmd *cmd)
  {
  	struct ieee80211_tx_info *skb_info = IEEE80211_SKB_CB(skb);
  
  	memset(&skb_info->status, 0, sizeof(skb_info->status));
  	memset(skb_info->driver_data, 0, sizeof(skb_info->driver_data));
  
  	skb_info->driver_data[1] = cmd;
  }
  
  static int iwl_mvm_get_ctrl_vif_queue(struct iwl_mvm *mvm,
  				      struct ieee80211_tx_info *info, __le16 fc)
  {
  	struct iwl_mvm_vif *mvmvif;
  
  	mvmvif = iwl_mvm_vif_from_mac80211(info->control.vif);
  
  	switch (info->control.vif->type) {
  	case NL80211_IFTYPE_AP:
  	case NL80211_IFTYPE_ADHOC:
  		/*
  		 * Non-bufferable frames use the broadcast station, thus they
  		 * use the probe queue.
  		 * Also take care of the case where we send a deauth to a
  		 * station that we don't have, or similarly an association
  		 * response (with non-success status) for a station we can't
  		 * accept.
  		 * Also, disassociate frames might happen, particular with
  		 * reason 7 ("Class 3 frame received from nonassociated STA").
  		 */
  		if (ieee80211_is_mgmt(fc) &&
  		    (!ieee80211_is_bufferable_mmpdu(fc) ||
  		     ieee80211_is_deauth(fc) || ieee80211_is_disassoc(fc)))
  			return mvm->probe_queue;
  		if (info->hw_queue == info->control.vif->cab_queue)
  			return mvmvif->cab_queue;
  
  		WARN_ONCE(info->control.vif->type != NL80211_IFTYPE_ADHOC,
  			  "fc=0x%02x", le16_to_cpu(fc));
  		return mvm->probe_queue;
  	case NL80211_IFTYPE_P2P_DEVICE:
  		if (ieee80211_is_mgmt(fc))
  			return mvm->p2p_dev_queue;
  		if (info->hw_queue == info->control.vif->cab_queue)
  			return mvmvif->cab_queue;
  
  		WARN_ON_ONCE(1);
  		return mvm->p2p_dev_queue;
  	default:
  		WARN_ONCE(1, "Not a ctrl vif, no available queue\n");
  		return -1;
  	}
  }
  
  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 *skb_info = IEEE80211_SKB_CB(skb);
  	struct ieee80211_tx_info info;
  	struct iwl_device_cmd *dev_cmd;
  	u8 sta_id;
  	int hdrlen = ieee80211_hdrlen(hdr->frame_control);
  	int queue;
  
  	/* 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 (skb_info->hw_queue == IWL_MVM_OFFCHANNEL_QUEUE &&
  	    skb_info->control.vif->type == NL80211_IFTYPE_STATION)
  		skb_info->hw_queue = mvm->aux_queue;
  
  	memcpy(&info, skb->cb, sizeof(info));
  
  	if (WARN_ON_ONCE(skb->len > IEEE80211_MAX_DATA_LEN + hdrlen))
  		return -1;
  
  	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;
  
  	queue = info.hw_queue;
  
  	/*
  	 * If the interface on which the frame is sent is the P2P_DEVICE
  	 * or an AP/GO interface use the broadcast station associated
  	 * with it; otherwise if the interface is a managed interface
  	 * use the AP station associated with it for multicast traffic
  	 * (this is not possible for unicast packets as a TLDS discovery
  	 * response are sent without a station entry); otherwise use the
  	 * AUX station.
  	 */
  	sta_id = mvm->aux_sta.sta_id;
  	if (info.control.vif) {
  		struct iwl_mvm_vif *mvmvif =
  			iwl_mvm_vif_from_mac80211(info.control.vif);
  
  		if (info.control.vif->type == NL80211_IFTYPE_P2P_DEVICE ||
  		    info.control.vif->type == NL80211_IFTYPE_AP ||
  		    info.control.vif->type == NL80211_IFTYPE_ADHOC) {
  			if (!ieee80211_is_data(hdr->frame_control))
  				sta_id = mvmvif->bcast_sta.sta_id;
  			else
  				sta_id = mvmvif->mcast_sta.sta_id;
  
  			queue = iwl_mvm_get_ctrl_vif_queue(mvm, &info,
  							   hdr->frame_control);
  			if (queue < 0)
  				return -1;
  		} else if (info.control.vif->type == NL80211_IFTYPE_STATION &&
  			   is_multicast_ether_addr(hdr->addr1)) {
  			u8 ap_sta_id = READ_ONCE(mvmvif->ap_sta_id);
  
  			if (ap_sta_id != IWL_MVM_INVALID_STA)
  				sta_id = ap_sta_id;
  		} else if (info.control.vif->type == NL80211_IFTYPE_MONITOR) {
  			queue = mvm->snif_queue;
  			sta_id = mvm->snif_sta.sta_id;
  		}
  	}
  
  	IWL_DEBUG_TX(mvm, "station Id %d, queue=%d\n", sta_id, queue);
  
  	dev_cmd = iwl_mvm_set_tx_params(mvm, skb, &info, hdrlen, NULL, sta_id);
  	if (!dev_cmd)
  		return -1;
  
  	/* From now on, we cannot access info->control */
  	iwl_mvm_skb_prepare_status(skb, dev_cmd);
  
  	if (iwl_trans_tx(mvm->trans, skb, dev_cmd, queue)) {
  		iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
  		return -1;
  	}
  
  	return 0;
  }
  
  #ifdef CONFIG_INET
  
  static int
  iwl_mvm_tx_tso_segment(struct sk_buff *skb, unsigned int num_subframes,
  		       netdev_features_t netdev_flags,
  		       struct sk_buff_head *mpdus_skb)
  {
  	struct sk_buff *tmp, *next;
  	struct ieee80211_hdr *hdr = (void *)skb->data;
  	char cb[sizeof(skb->cb)];
  	u16 i = 0;
  	unsigned int tcp_payload_len;
  	unsigned int mss = skb_shinfo(skb)->gso_size;
  	bool ipv4 = (skb->protocol == htons(ETH_P_IP));
  	u16 ip_base_id = ipv4 ? ntohs(ip_hdr(skb)->id) : 0;
  
  	skb_shinfo(skb)->gso_size = num_subframes * mss;
  	memcpy(cb, skb->cb, sizeof(cb));
  
  	next = skb_gso_segment(skb, netdev_flags);
  	skb_shinfo(skb)->gso_size = mss;
  	if (WARN_ON_ONCE(IS_ERR(next)))
  		return -EINVAL;
  	else if (next)
  		consume_skb(skb);
  
  	while (next) {
  		tmp = next;
  		next = tmp->next;
  
  		memcpy(tmp->cb, cb, sizeof(tmp->cb));
  		/*
  		 * Compute the length of all the data added for the A-MSDU.
  		 * This will be used to compute the length to write in the TX
  		 * command. We have: SNAP + IP + TCP for n -1 subframes and
  		 * ETH header for n subframes.
  		 */
  		tcp_payload_len = skb_tail_pointer(tmp) -
  			skb_transport_header(tmp) -
  			tcp_hdrlen(tmp) + tmp->data_len;
  
  		if (ipv4)
  			ip_hdr(tmp)->id = htons(ip_base_id + i * num_subframes);
  
  		if (tcp_payload_len > mss) {
  			skb_shinfo(tmp)->gso_size = mss;
  		} else {
  			if (ieee80211_is_data_qos(hdr->frame_control)) {
  				u8 *qc;
  
  				if (ipv4)
  					ip_send_check(ip_hdr(tmp));
  
  				qc = ieee80211_get_qos_ctl((void *)tmp->data);
  				*qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
  			}
  			skb_shinfo(tmp)->gso_size = 0;
  		}
  
  		tmp->prev = NULL;
  		tmp->next = NULL;
  
  		__skb_queue_tail(mpdus_skb, tmp);
  		i++;
  	}
  
  	return 0;
  }
  
  static unsigned int iwl_mvm_max_amsdu_size(struct iwl_mvm *mvm,
  					   struct ieee80211_sta *sta,
  					   unsigned int tid)
  {
  	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
  	enum nl80211_band band = mvmsta->vif->bss_conf.chandef.chan->band;
  	u8 ac = tid_to_mac80211_ac[tid];
  	unsigned int txf;
  	int lmac = IWL_LMAC_24G_INDEX;
  
  	if (iwl_mvm_is_cdb_supported(mvm) &&
  	    band == NL80211_BAND_5GHZ)
  		lmac = IWL_LMAC_5G_INDEX;
  
  	/* For HE redirect to trigger based fifos */
  	if (sta->he_cap.has_he && !WARN_ON(!iwl_mvm_has_new_tx_api(mvm)))
  		ac += 4;
  
  	txf = iwl_mvm_mac_ac_to_tx_fifo(mvm, ac);
  
  	/*
  	 * Don't send an AMSDU that will be longer than the TXF.
  	 * Add a security margin of 256 for the TX command + headers.
  	 * We also want to have the start of the next packet inside the
  	 * fifo to be able to send bursts.
  	 */
  	return min_t(unsigned int, mvmsta->max_amsdu_len,
  		     mvm->fwrt.smem_cfg.lmac[lmac].txfifo_size[txf] - 256);
  }
  
  static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb,
  			  struct ieee80211_tx_info *info,
  			  struct ieee80211_sta *sta,
  			  struct sk_buff_head *mpdus_skb)
  {
  	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
  	struct ieee80211_hdr *hdr = (void *)skb->data;
  	unsigned int mss = skb_shinfo(skb)->gso_size;
  	unsigned int num_subframes, tcp_payload_len, subf_len, max_amsdu_len;
  	u16 snap_ip_tcp, pad;
  	unsigned int dbg_max_amsdu_len;
  	netdev_features_t netdev_flags = NETIF_F_CSUM_MASK | NETIF_F_SG;
  	u8 tid;
  
  	snap_ip_tcp = 8 + skb_transport_header(skb) - skb_network_header(skb) +
  		tcp_hdrlen(skb);
  
  	dbg_max_amsdu_len = READ_ONCE(mvm->max_amsdu_len);
  
  	if (!mvmsta->max_amsdu_len ||
  	    !ieee80211_is_data_qos(hdr->frame_control) ||
  	    (!mvmsta->amsdu_enabled && !dbg_max_amsdu_len))
  		return iwl_mvm_tx_tso_segment(skb, 1, netdev_flags, mpdus_skb);
  
  	/*
  	 * Do not build AMSDU for IPv6 with extension headers.
  	 * ask stack to segment and checkum the generated MPDUs for us.
  	 */
  	if (skb->protocol == htons(ETH_P_IPV6) &&
  	    ((struct ipv6hdr *)skb_network_header(skb))->nexthdr !=
  	    IPPROTO_TCP) {
  		netdev_flags &= ~NETIF_F_CSUM_MASK;
  		return iwl_mvm_tx_tso_segment(skb, 1, netdev_flags, mpdus_skb);
  	}
  
  	tid = ieee80211_get_tid(hdr);
  	if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
  		return -EINVAL;
  
  	/*
  	 * No need to lock amsdu_in_ampdu_allowed since it can't be modified
  	 * during an BA session.
  	 */
  	if (info->flags & IEEE80211_TX_CTL_AMPDU &&
  	    !mvmsta->tid_data[tid].amsdu_in_ampdu_allowed)
  		return iwl_mvm_tx_tso_segment(skb, 1, netdev_flags, mpdus_skb);
  
  	if (iwl_mvm_vif_low_latency(iwl_mvm_vif_from_mac80211(mvmsta->vif)) ||
  	    !(mvmsta->amsdu_enabled & BIT(tid)))
  		return iwl_mvm_tx_tso_segment(skb, 1, netdev_flags, mpdus_skb);
  
  	max_amsdu_len = iwl_mvm_max_amsdu_size(mvm, sta, tid);
  
  	if (unlikely(dbg_max_amsdu_len))
  		max_amsdu_len = min_t(unsigned int, max_amsdu_len,
  				      dbg_max_amsdu_len);
  
  	/*
  	 * Limit A-MSDU in A-MPDU to 4095 bytes when VHT is not
  	 * supported. This is a spec requirement (IEEE 802.11-2015
  	 * section 8.7.3 NOTE 3).
  	 */
  	if (info->flags & IEEE80211_TX_CTL_AMPDU &&
  	    !sta->vht_cap.vht_supported)
  		max_amsdu_len = min_t(unsigned int, max_amsdu_len, 4095);
  
  	/* Sub frame header + SNAP + IP header + TCP header + MSS */
  	subf_len = sizeof(struct ethhdr) + snap_ip_tcp + mss;
  	pad = (4 - subf_len) & 0x3;
  
  	/*
  	 * If we have N subframes in the A-MSDU, then the A-MSDU's size is
  	 * N * subf_len + (N - 1) * pad.
  	 */
  	num_subframes = (max_amsdu_len + pad) / (subf_len + pad);
  
  	if (sta->max_amsdu_subframes &&
  	    num_subframes > sta->max_amsdu_subframes)
  		num_subframes = sta->max_amsdu_subframes;
  
  	tcp_payload_len = skb_tail_pointer(skb) - skb_transport_header(skb) -
  		tcp_hdrlen(skb) + skb->data_len;
  
  	/*
  	 * Make sure we have enough TBs for the A-MSDU:
  	 *	2 for each subframe
  	 *	1 more for each fragment
  	 *	1 more for the potential data in the header
  	 */
  	if ((num_subframes * 2 + skb_shinfo(skb)->nr_frags + 1) >
  	    mvm->trans->max_skb_frags)
  		num_subframes = 1;
  
  	if (num_subframes > 1)
  		*ieee80211_get_qos_ctl(hdr) |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
  
  	/* This skb fits in one single A-MSDU */
  	if (num_subframes * mss >= tcp_payload_len) {
  		__skb_queue_tail(mpdus_skb, skb);
  		return 0;
  	}
  
  	/*
  	 * Trick the segmentation function to make it
  	 * create SKBs that can fit into one A-MSDU.
  	 */
  	return iwl_mvm_tx_tso_segment(skb, num_subframes, netdev_flags,
  				      mpdus_skb);
  }
  #else /* CONFIG_INET */
  static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb,
  			  struct ieee80211_tx_info *info,
  			  struct ieee80211_sta *sta,
  			  struct sk_buff_head *mpdus_skb)
  {
  	/* Impossible to get TSO with CONFIG_INET */
  	WARN_ON(1);
  
  	return -1;
  }
  #endif
  
  static void iwl_mvm_tx_add_stream(struct iwl_mvm *mvm,
  				  struct iwl_mvm_sta *mvm_sta, u8 tid,
  				  struct sk_buff *skb)
  {
  	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  	u8 mac_queue = info->hw_queue;
  	struct sk_buff_head *deferred_tx_frames;
  
  	lockdep_assert_held(&mvm_sta->lock);
  
  	mvm_sta->deferred_traffic_tid_map |= BIT(tid);
  	set_bit(mvm_sta->sta_id, mvm->sta_deferred_frames);
  
  	deferred_tx_frames = &mvm_sta->tid_data[tid].deferred_tx_frames;
  
  	skb_queue_tail(deferred_tx_frames, skb);
  
  	/*
  	 * The first deferred frame should've stopped the MAC queues, so we
  	 * should never get a second deferred frame for the RA/TID.
  	 * In case of GSO the first packet may have been split, so don't warn.
  	 */
  	if (skb_queue_len(deferred_tx_frames) == 1) {
  		iwl_mvm_stop_mac_queues(mvm, BIT(mac_queue));
  		schedule_work(&mvm->add_stream_wk);
  	}
  }
  
  /* Check if there are any timed-out TIDs on a given shared TXQ */
  static bool iwl_mvm_txq_should_update(struct iwl_mvm *mvm, int txq_id)
  {
  	unsigned long queue_tid_bitmap = mvm->queue_info[txq_id].tid_bitmap;
  	unsigned long now = jiffies;
  	int tid;
  
  	if (WARN_ON(iwl_mvm_has_new_tx_api(mvm)))
  		return false;
  
  	for_each_set_bit(tid, &queue_tid_bitmap, IWL_MAX_TID_COUNT + 1) {
  		if (time_before(mvm->queue_info[txq_id].last_frame_time[tid] +
  				IWL_MVM_DQA_QUEUE_TIMEOUT, now))
  			return true;
  	}
  
  	return false;
  }
  
  static void iwl_mvm_tx_airtime(struct iwl_mvm *mvm,
  			       struct iwl_mvm_sta *mvmsta,
  			       int airtime)
  {
  	int mac = mvmsta->mac_id_n_color & FW_CTXT_ID_MSK;
  	struct iwl_mvm_tcm_mac *mdata = &mvm->tcm.data[mac];
  
  	if (mvm->tcm.paused)
  		return;
  
  	if (time_after(jiffies, mvm->tcm.ts + MVM_TCM_PERIOD))
  		schedule_delayed_work(&mvm->tcm.work, 0);
  
  	mdata->tx.airtime += airtime;
  }
  
  static void iwl_mvm_tx_pkt_queued(struct iwl_mvm *mvm,
  				  struct iwl_mvm_sta *mvmsta, int tid)
  {
  	u32 ac = tid_to_mac80211_ac[tid];
  	int mac = mvmsta->mac_id_n_color & FW_CTXT_ID_MSK;
  	struct iwl_mvm_tcm_mac *mdata = &mvm->tcm.data[mac];
  
  	mdata->tx.pkts[ac]++;
  }
  
  /*
   * Sets the fields in the Tx cmd that are crypto related
   */
  static int iwl_mvm_tx_mpdu(struct iwl_mvm *mvm, struct sk_buff *skb,
  			   struct ieee80211_tx_info *info,
  			   struct ieee80211_sta *sta)
  {
  	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
  	struct iwl_mvm_sta *mvmsta;
  	struct iwl_device_cmd *dev_cmd;
  	__le16 fc;
  	u16 seq_number = 0;
  	u8 tid = IWL_MAX_TID_COUNT;
  	u16 txq_id = info->hw_queue;
  	bool is_ampdu = false;
  	int hdrlen;
  
  	mvmsta = iwl_mvm_sta_from_mac80211(sta);
  	fc = hdr->frame_control;
  	hdrlen = ieee80211_hdrlen(fc);
  
  	if (WARN_ON_ONCE(!mvmsta))
  		return -1;
  
  	if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_INVALID_STA))
  		return -1;
  
  	dev_cmd = iwl_mvm_set_tx_params(mvm, skb, info, hdrlen,
  					sta, mvmsta->sta_id);
  	if (!dev_cmd)
  		goto drop;
  
  	/*
  	 * 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);
  
  	/* nullfunc frames should go to the MGMT queue regardless of QOS,
  	 * the condition of !ieee80211_is_qos_nullfunc(fc) keeps the default
  	 * assignment of MGMT TID
  	 */
  	if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) {
  		tid = ieee80211_get_tid(hdr);
  		if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
  			goto drop_unlock_sta;
  
  		is_ampdu = info->flags & IEEE80211_TX_CTL_AMPDU;
  		if (WARN_ON_ONCE(is_ampdu &&
  				 mvmsta->tid_data[tid].state != IWL_AGG_ON))
  			goto drop_unlock_sta;
  
  		seq_number = mvmsta->tid_data[tid].seq_number;
  		seq_number &= IEEE80211_SCTL_SEQ;
  
  		if (!iwl_mvm_has_new_tx_api(mvm)) {
  			struct iwl_tx_cmd *tx_cmd = (void *)dev_cmd->payload;
  
  			hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
  			hdr->seq_ctrl |= cpu_to_le16(seq_number);
  			/* update the tx_cmd hdr as it was already copied */
  			tx_cmd->hdr->seq_ctrl = hdr->seq_ctrl;
  		}
  	}
  
  	txq_id = mvmsta->tid_data[tid].txq_id;
  
  	WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM);
  
  	/* Check if TXQ needs to be allocated or re-activated */
  	if (unlikely(txq_id == IWL_MVM_INVALID_QUEUE ||
  		     !mvmsta->tid_data[tid].is_tid_active)) {
  		/* If TXQ needs to be allocated... */
  		if (txq_id == IWL_MVM_INVALID_QUEUE) {
  			iwl_mvm_tx_add_stream(mvm, mvmsta, tid, skb);
  
  			/*
  			 * The frame is now deferred, and the worker scheduled
  			 * will re-allocate it, so we can free it for now.
  			 */
  			iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
  			spin_unlock(&mvmsta->lock);
  			return 0;
  		}
  
  		/* queue should always be active in new TX path */
  		WARN_ON(iwl_mvm_has_new_tx_api(mvm));
  
  		/* If we are here - TXQ exists and needs to be re-activated */
  		spin_lock(&mvm->queue_info_lock);
  		mvm->queue_info[txq_id].status = IWL_MVM_QUEUE_READY;
  		mvmsta->tid_data[tid].is_tid_active = true;
  		spin_unlock(&mvm->queue_info_lock);
  
  		IWL_DEBUG_TX_QUEUES(mvm, "Re-activating queue %d for TX\n",
  				    txq_id);
  	}
  
  	if (!iwl_mvm_has_new_tx_api(mvm)) {
  		/* Keep track of the time of the last frame for this RA/TID */
  		mvm->queue_info[txq_id].last_frame_time[tid] = jiffies;
  
  		/*
  		 * If we have timed-out TIDs - schedule the worker that will
  		 * reconfig the queues and update them
  		 *
  		 * Note that the mvm->queue_info_lock isn't being taken here in
  		 * order to not serialize the TX flow. This isn't dangerous
  		 * because scheduling mvm->add_stream_wk can't ruin the state,
  		 * and if we DON'T schedule it due to some race condition then
  		 * next TX we get here we will.
  		 */
  		if (unlikely(mvm->queue_info[txq_id].status ==
  			     IWL_MVM_QUEUE_SHARED &&
  			     iwl_mvm_txq_should_update(mvm, txq_id)))
  			schedule_work(&mvm->add_stream_wk);
  	}
  
  	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));
  
  	/* From now on, we cannot access info->control */
  	iwl_mvm_skb_prepare_status(skb, dev_cmd);
  
  	if (iwl_trans_tx(mvm->trans, skb, dev_cmd, txq_id))
  		goto drop_unlock_sta;
  
  	if (tid < IWL_MAX_TID_COUNT && !ieee80211_has_morefrags(fc))
  		mvmsta->tid_data[tid].seq_number = seq_number + 0x10;
  
  	spin_unlock(&mvmsta->lock);
  
  	iwl_mvm_tx_pkt_queued(mvm, mvmsta, tid == IWL_MAX_TID_COUNT ? 0 : tid);
  
  	return 0;
  
  drop_unlock_sta:
  	iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
  	spin_unlock(&mvmsta->lock);
  drop:
  	return -1;
  }
  
  int iwl_mvm_tx_skb(struct iwl_mvm *mvm, struct sk_buff *skb,
  		   struct ieee80211_sta *sta)
  {
  	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
  	struct ieee80211_tx_info info;
  	struct sk_buff_head mpdus_skbs;
  	unsigned int payload_len;
  	int ret;
  
  	if (WARN_ON_ONCE(!mvmsta))
  		return -1;
  
  	if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_INVALID_STA))
  		return -1;
  
  	memcpy(&info, skb->cb, sizeof(info));
  
  	if (!skb_is_gso(skb))
  		return iwl_mvm_tx_mpdu(mvm, skb, &info, sta);
  
  	payload_len = skb_tail_pointer(skb) - skb_transport_header(skb) -
  		tcp_hdrlen(skb) + skb->data_len;
  
  	if (payload_len <= skb_shinfo(skb)->gso_size)
  		return iwl_mvm_tx_mpdu(mvm, skb, &info, sta);
  
  	__skb_queue_head_init(&mpdus_skbs);
  
  	ret = iwl_mvm_tx_tso(mvm, skb, &info, sta, &mpdus_skbs);
  	if (ret)
  		return ret;
  
  	if (WARN_ON(skb_queue_empty(&mpdus_skbs)))
  		return ret;
  
  	while (!skb_queue_empty(&mpdus_skbs)) {
  		skb = __skb_dequeue(&mpdus_skbs);
  
  		ret = iwl_mvm_tx_mpdu(mvm, skb, &info, sta);
  		if (ret) {
  			__skb_queue_purge(&mpdus_skbs);
  			return ret;
  		}
  	}
  
  	return 0;
  }
  
  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;
  	u16 normalized_ssn;
  
  	lockdep_assert_held(&mvmsta->lock);
  
  	if ((tid_data->state == IWL_AGG_ON ||
  	     tid_data->state == IWL_EMPTYING_HW_QUEUE_DELBA) &&
  	    iwl_mvm_tid_queued(mvm, tid_data) == 0) {
  		/*
  		 * Now that this aggregation or DQA 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);
  	}
  
  	/*
  	 * In 22000 HW, the next_reclaimed index is only 8 bit, so we'll need
  	 * to align the wrap around of ssn so we compare relevant values.
  	 */
  	normalized_ssn = tid_data->ssn;
  	if (mvm->trans->cfg->gen2)
  		normalized_ssn &= 0xff;
  
  	if (normalized_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);
  		tid_data->state = IWL_AGG_OFF;
  		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 nl80211_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_tx_status_check_trigger(struct iwl_mvm *mvm,
  					    u32 status)
  {
  	struct iwl_fw_dbg_trigger_tlv *trig;
  	struct iwl_fw_dbg_trigger_tx_status *status_trig;
  	int i;
  
  	if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_TX_STATUS))
  		return;
  
  	trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_TX_STATUS);
  	status_trig = (void *)trig->data;
  
  	if (!iwl_fw_dbg_trigger_check_stop(&mvm->fwrt, NULL, trig))
  		return;
  
  	for (i = 0; i < ARRAY_SIZE(status_trig->statuses); i++) {
  		/* don't collect on status 0 */
  		if (!status_trig->statuses[i].status)
  			break;
  
  		if (status_trig->statuses[i].status != (status & TX_STATUS_MSK))
  			continue;
  
  		iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
  					"Tx status %d was received",
  					status & TX_STATUS_MSK);
  		break;
  	}
  }
  
  /**
   * iwl_mvm_get_scd_ssn - returns the SSN of the SCD
   * @tx_resp: the Tx response from the fw (agg or non-agg)
   *
   * When the fw sends an AMPDU, it fetches the MPDUs one after the other. Since
   * it can't know that everything will go well until the end of the AMPDU, it
   * can't know in advance the number of MPDUs that will be sent in the current
   * batch. This is why it writes the agg Tx response while it fetches the MPDUs.
   * Hence, it can't know in advance what the SSN of the SCD will be at the end
   * of the batch. This is why the SSN of the SCD is written at the end of the
   * whole struct at a variable offset. This function knows how to cope with the
   * variable offset and returns the SSN of the SCD.
   */
  static inline u32 iwl_mvm_get_scd_ssn(struct iwl_mvm *mvm,
  				      struct iwl_mvm_tx_resp *tx_resp)
  {
  	return le32_to_cpup((__le32 *)iwl_mvm_get_agg_status(mvm, tx_resp) +
  			    tx_resp->frame_count) & 0xfff;
  }
  
  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_v3 is almost the same */
  	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);
  	struct agg_tx_status *agg_status =
  		iwl_mvm_get_agg_status(mvm, tx_resp);
  	u32 status = le16_to_cpu(agg_status->status);
  	u16 ssn = iwl_mvm_get_scd_ssn(mvm, tx_resp);
  	struct iwl_mvm_sta *mvmsta;
  	struct sk_buff_head skbs;
  	u8 skb_freed = 0;
  	u8 lq_color;
  	u16 next_reclaimed, seq_ctl;
  	bool is_ndp = false;
  
  	__skb_queue_head_init(&skbs);
  
  	if (iwl_mvm_has_new_tx_api(mvm))
  		txq_id = le16_to_cpu(tx_resp->tx_queue);
  
  	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);
  		struct ieee80211_hdr *hdr = (void *)skb->data;
  		bool flushed = false;
  
  		skb_freed++;
  
  		iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);
  
  		memset(&info->status, 0, sizeof(info->status));
  
  		/* 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_FIFO_FLUSHED:
  		case TX_STATUS_FAIL_DRAIN_FLOW:
  			flushed = true;
  			break;
  		case TX_STATUS_FAIL_DEST_PS:
  			/* the FW should have stopped the queue and not
  			 * return this status
  			 */
  			WARN_ON(1);
  			info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
  			break;
  		default:
  			break;
  		}
  
  		/*
  		 * If we are freeing multiple frames, mark all the frames
  		 * but the first one as acked, since they were acknowledged
  		 * before
  		 * */
  		if (skb_freed > 1)
  			info->flags |= IEEE80211_TX_STAT_ACK;
  
  		iwl_mvm_tx_status_check_trigger(mvm, status);
  
  		info->status.rates[0].count = tx_resp->failure_frame + 1;
  		iwl_mvm_hwrate_to_tx_status(le32_to_cpu(tx_resp->initial_rate),
  					    info);
  		info->status.status_driver_data[1] =
  			(void *)(uintptr_t)le32_to_cpu(tx_resp->initial_rate);
  
  		/* Single frame failure in an AMPDU queue => send BAR */
  		if (info->flags & IEEE80211_TX_CTL_AMPDU &&
  		    !(info->flags & IEEE80211_TX_STAT_ACK) &&
  		    !(info->flags & IEEE80211_TX_STAT_TX_FILTERED) && !flushed)
  			info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
  		info->flags &= ~IEEE80211_TX_CTL_AMPDU;
  
  		/* W/A FW bug: seq_ctl is wrong upon failure / BAR frame */
  		if (ieee80211_is_back_req(hdr->frame_control))
  			seq_ctl = 0;
  		else if (status != TX_STATUS_SUCCESS)
  			seq_ctl = le16_to_cpu(hdr->seq_ctrl);
  
  		if (unlikely(!seq_ctl)) {
  			struct ieee80211_hdr *hdr = (void *)skb->data;
  
  			/*
  			 * If it is an NDP, we can't update next_reclaim since
  			 * its sequence control is 0. Note that for that same
  			 * reason, NDPs are never sent to A-MPDU'able queues
  			 * so that we can never have more than one freed frame
  			 * for a single Tx resonse (see WARN_ON below).
  			 */
  			if (ieee80211_is_qos_nullfunc(hdr->frame_control))
  				is_ndp = true;
  		}
  
  		/*
  		 * TODO: this is not accurate if we are freeing more than one
  		 * packet.
  		 */
  		info->status.tx_time =
  			le16_to_cpu(tx_resp->wireless_media_time);
  		BUILD_BUG_ON(ARRAY_SIZE(info->status.status_driver_data) < 1);
  		lq_color = TX_RES_RATE_TABLE_COL_GET(tx_resp->tlc_info);
  		info->status.status_driver_data[0] =
  			RS_DRV_DATA_PACK(lq_color, tx_resp->reduced_tpc);
  
  		ieee80211_tx_status(mvm->hw, skb);
  	}
  
  	/* This is an aggregation queue or might become one, so 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;
  
  	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);
  
  		iwl_mvm_tx_airtime(mvm, mvmsta,
  				   le16_to_cpu(tx_resp->wireless_media_time));
  
  		if (tid != IWL_TID_NON_QOS && tid != IWL_MGMT_TID) {
  			struct iwl_mvm_tid_data *tid_data =
  				&mvmsta->tid_data[tid];
  			bool send_eosp_ndp = false;
  
  			spin_lock_bh(&mvmsta->lock);
  
  			if (!is_ndp) {
  				tid_data->next_reclaimed = next_reclaimed;
  				IWL_DEBUG_TX_REPLY(mvm,
  						   "Next reclaimed packet:%d\n",
  						   next_reclaimed);
  			} else {
  				IWL_DEBUG_TX_REPLY(mvm,
  						   "NDP - don't update next_reclaimed\n");
  			}
  
  			iwl_mvm_check_ratid_empty(mvm, sta, tid);
  
  			if (mvmsta->sleep_tx_count) {
  				mvmsta->sleep_tx_count--;
  				if (mvmsta->sleep_tx_count &&
  				    !iwl_mvm_tid_queued(mvm, tid_data)) {
  					/*
  					 * The number of frames in the queue
  					 * dropped to 0 even if we sent less
  					 * frames than we thought we had on the
  					 * Tx queue.
  					 * This means we had holes in the BA
  					 * window that we just filled, ask
  					 * mac80211 to send EOSP since the
  					 * firmware won't know how to do that.
  					 * Send NDP and the firmware will send
  					 * EOSP notification that will trigger
  					 * a call to ieee80211_sta_eosp().
  					 */
  					send_eosp_ndp = true;
  				}
  			}
  
  			spin_unlock_bh(&mvmsta->lock);
  			if (send_eosp_ndp) {
  				iwl_mvm_sta_modify_sleep_tx_count(mvm, sta,
  					IEEE80211_FRAME_RELEASE_UAPSD,
  					1, tid, false, false);
  				mvmsta->sleep_tx_count = 0;
  				ieee80211_send_eosp_nullfunc(sta, tid);
  			}
  		}
  
  		if (mvmsta->next_status_eosp) {
  			mvmsta->next_status_eosp = false;
  			ieee80211_sta_eosp(sta);
  		}
  	} else {
  		mvmsta = NULL;
  	}
  
  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_(TX_ON_AIR_DROP);
  	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 =
  		iwl_mvm_get_agg_status(mvm, tx_resp);
  	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 iwl_mvm_sta *mvmsta;
  	int queue = SEQ_TO_QUEUE(sequence);
  
  	if (WARN_ON_ONCE(queue < IWL_MVM_DQA_MIN_DATA_QUEUE &&
  			 (queue != IWL_MVM_DQA_BSS_CLIENT_QUEUE)))
  		return;
  
  	if (WARN_ON_ONCE(tid == IWL_TID_NON_QOS))
  		return;
  
  	iwl_mvm_rx_tx_cmd_agg_dbg(mvm, pkt);
  
  	rcu_read_lock();
  
  	mvmsta = iwl_mvm_sta_from_staid_rcu(mvm, sta_id);
  
  	if (!WARN_ON_ONCE(!mvmsta)) {
  		mvmsta->tid_data[tid].rate_n_flags =
  			le32_to_cpu(tx_resp->initial_rate);
  		mvmsta->tid_data[tid].tx_time =
  			le16_to_cpu(tx_resp->wireless_media_time);
  		mvmsta->tid_data[tid].lq_color =
  			TX_RES_RATE_TABLE_COL_GET(tx_resp->tlc_info);
  		iwl_mvm_tx_airtime(mvm, mvmsta,
  				   le16_to_cpu(tx_resp->wireless_media_time));
  	}
  
  	rcu_read_unlock();
  }
  
  void iwl_mvm_rx_tx_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
  {
  	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);
  }
  
  static void iwl_mvm_tx_reclaim(struct iwl_mvm *mvm, int sta_id, int tid,
  			       int txq, int index,
  			       struct ieee80211_tx_info *ba_info, u32 rate)
  {
  	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 freed;
  
  	if (WARN_ONCE(sta_id >= IWL_MVM_STATION_COUNT ||
  		      tid > IWL_MAX_TID_COUNT,
  		      "sta_id %d tid %d", sta_id, tid))
  		return;
  
  	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;
  	}
  
  	mvmsta = iwl_mvm_sta_from_mac80211(sta);
  	tid_data = &mvmsta->tid_data[tid];
  
  	if (tid_data->txq_id != txq) {
  		IWL_ERR(mvm,
  			"invalid BA notification: Q %d, tid %d\n",
  			tid_data->txq_id, tid);
  		rcu_read_unlock();
  		return;
  	}
  
  	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, txq, index, &reclaimed_skbs);
  
  	tid_data->next_reclaimed = index;
  
  	iwl_mvm_check_ratid_empty(mvm, sta, tid);
  
  	freed = 0;
  
  	/* pack lq color from tid_data along the reduced txp */
  	ba_info->status.status_driver_data[0] =
  		RS_DRV_DATA_PACK(tid_data->lq_color,
  				 ba_info->status.status_driver_data[0]);
  	ba_info->status.status_driver_data[1] = (void *)(uintptr_t)rate;
  
  	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(tid != IWL_MAX_TID_COUNT);
  
  		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;
  
  		/* this is the first skb we deliver in this batch */
  		/* put the rate scaling data there */
  		if (freed == 1) {
  			info->flags |= IEEE80211_TX_STAT_AMPDU;
  			memcpy(&info->status, &ba_info->status,
  			       sizeof(ba_info->status));
  			iwl_mvm_hwrate_to_tx_status(rate, info);
  		}
  	}
  
  	spin_unlock_bh(&mvmsta->lock);
  
  	/* We got a BA notif with 0 acked or scd_ssn didn't progress which is
  	 * possible (i.e. first MPDU in the aggregation wasn't acked)
  	 * Still it's important to update RS about sent vs. acked.
  	 */
  	if (skb_queue_empty(&reclaimed_skbs)) {
  		struct ieee80211_chanctx_conf *chanctx_conf = NULL;
  
  		if (mvmsta->vif)
  			chanctx_conf =
  				rcu_dereference(mvmsta->vif->chanctx_conf);
  
  		if (WARN_ON_ONCE(!chanctx_conf))
  			goto out;
  
  		ba_info->band = chanctx_conf->def.chan->band;
  		iwl_mvm_hwrate_to_tx_status(rate, ba_info);
  
  		if (!iwl_mvm_has_tlc_offload(mvm)) {
  			IWL_DEBUG_TX_REPLY(mvm,
  					   "No reclaim. Update rs directly\n");
  			iwl_mvm_rs_tx_status(mvm, sta, tid, ba_info, false);
  		}
  	}
  
  out:
  	rcu_read_unlock();
  
  	while (!skb_queue_empty(&reclaimed_skbs)) {
  		skb = __skb_dequeue(&reclaimed_skbs);
  		ieee80211_tx_status(mvm->hw, skb);
  	}
  }
  
  void iwl_mvm_rx_ba_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
  {
  	struct iwl_rx_packet *pkt = rxb_addr(rxb);
  	int sta_id, tid, txq, index;
  	struct ieee80211_tx_info ba_info = {};
  	struct iwl_mvm_ba_notif *ba_notif;
  	struct iwl_mvm_tid_data *tid_data;
  	struct iwl_mvm_sta *mvmsta;
  
  	ba_info.flags = IEEE80211_TX_STAT_AMPDU;
  
  	if (iwl_mvm_has_new_tx_api(mvm)) {
  		struct iwl_mvm_compressed_ba_notif *ba_res =
  			(void *)pkt->data;
  		u8 lq_color = TX_RES_RATE_TABLE_COL_GET(ba_res->tlc_rate_info);
  		int i;
  
  		sta_id = ba_res->sta_id;
  		ba_info.status.ampdu_ack_len = (u8)le16_to_cpu(ba_res->done);
  		ba_info.status.ampdu_len = (u8)le16_to_cpu(ba_res->txed);
  		ba_info.status.tx_time =
  			(u16)le32_to_cpu(ba_res->wireless_time);
  		ba_info.status.status_driver_data[0] =
  			(void *)(uintptr_t)ba_res->reduced_txp;
  
  		if (!le16_to_cpu(ba_res->tfd_cnt))
  			goto out;
  
  		rcu_read_lock();
  
  		mvmsta = iwl_mvm_sta_from_staid_rcu(mvm, sta_id);
  		if (!mvmsta)
  			goto out_unlock;
  
  		/* Free per TID */
  		for (i = 0; i < le16_to_cpu(ba_res->tfd_cnt); i++) {
  			struct iwl_mvm_compressed_ba_tfd *ba_tfd =
  				&ba_res->tfd[i];
  
  			tid = ba_tfd->tid;
  			if (tid == IWL_MGMT_TID)
  				tid = IWL_MAX_TID_COUNT;
  
  			mvmsta->tid_data[i].lq_color = lq_color;
  			iwl_mvm_tx_reclaim(mvm, sta_id, tid,
  					   (int)(le16_to_cpu(ba_tfd->q_num)),
  					   le16_to_cpu(ba_tfd->tfd_index),
  					   &ba_info,
  					   le32_to_cpu(ba_res->tx_rate));
  		}
  
  		iwl_mvm_tx_airtime(mvm, mvmsta,
  				   le32_to_cpu(ba_res->wireless_time));
  out_unlock:
  		rcu_read_unlock();
  out:
  		IWL_DEBUG_TX_REPLY(mvm,
  				   "BA_NOTIFICATION Received from sta_id = %d, flags %x, sent:%d, acked:%d\n",
  				   sta_id, le32_to_cpu(ba_res->flags),
  				   le16_to_cpu(ba_res->txed),
  				   le16_to_cpu(ba_res->done));
  		return;
  	}
  
  	ba_notif = (void *)pkt->data;
  	sta_id = ba_notif->sta_id;
  	tid = ba_notif->tid;
  	/* "flow" corresponds to Tx queue */
  	txq = 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 */
  	index = le16_to_cpu(ba_notif->scd_ssn);
  
  	rcu_read_lock();
  	mvmsta = iwl_mvm_sta_from_staid_rcu(mvm, sta_id);
  	if (WARN_ON_ONCE(!mvmsta)) {
  		rcu_read_unlock();
  		return;
  	}
  
  	tid_data = &mvmsta->tid_data[tid];
  
  	ba_info.status.ampdu_ack_len = ba_notif->txed_2_done;
  	ba_info.status.ampdu_len = ba_notif->txed;
  	ba_info.status.tx_time = tid_data->tx_time;
  	ba_info.status.status_driver_data[0] =
  		(void *)(uintptr_t)ba_notif->reduced_txp;
  
  	rcu_read_unlock();
  
  	iwl_mvm_tx_reclaim(mvm, sta_id, tid, txq, index, &ba_info,
  			   tid_data->rate_n_flags);
  
  	IWL_DEBUG_TX_REPLY(mvm,
  			   "BA_NOTIFICATION Received from %pM, sta_id = %d\n",
  			   ba_notif->sta_addr, 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),
  			   le64_to_cpu(ba_notif->bitmap), txq, index,
  			   ba_notif->txed, ba_notif->txed_2_done);
  
  	IWL_DEBUG_TX_REPLY(mvm, "reduced txp from ba notif %d\n",
  			   ba_notif->reduced_txp);
  }
  
  /*
   * Note that there are transports that buffer frames before they reach
   * the firmware. This means that after flush_tx_path is called, the
   * queue might not be empty. The race-free way to handle this is to:
   * 1) set the station as draining
   * 2) flush the Tx path
   * 3) wait for the transport queues to be empty
   */
  int iwl_mvm_flush_tx_path(struct iwl_mvm *mvm, u32 tfd_msk, u32 flags)
  {
  	int ret;
  	struct iwl_tx_path_flush_cmd_v1 flush_cmd = {
  		.queues_ctl = cpu_to_le32(tfd_msk),
  		.flush_ctl = cpu_to_le16(DUMP_TX_FIFO_FLUSH),
  	};
  
  	WARN_ON(iwl_mvm_has_new_tx_api(mvm));
  
  	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;
  }
  
  int iwl_mvm_flush_sta_tids(struct iwl_mvm *mvm, u32 sta_id,
  			   u16 tids, u32 flags)
  {
  	int ret;
  	struct iwl_tx_path_flush_cmd flush_cmd = {
  		.sta_id = cpu_to_le32(sta_id),
  		.tid_mask = cpu_to_le16(tids),
  	};
  
  	WARN_ON(!iwl_mvm_has_new_tx_api(mvm));
  
  	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;
  }
  
  int iwl_mvm_flush_sta(struct iwl_mvm *mvm, void *sta, bool internal, u32 flags)
  {
  	struct iwl_mvm_int_sta *int_sta = sta;
  	struct iwl_mvm_sta *mvm_sta = sta;
  
  	BUILD_BUG_ON(offsetof(struct iwl_mvm_int_sta, sta_id) !=
  		     offsetof(struct iwl_mvm_sta, sta_id));
  
  	if (iwl_mvm_has_new_tx_api(mvm))
  		return iwl_mvm_flush_sta_tids(mvm, mvm_sta->sta_id,
  					      0xff | BIT(IWL_MGMT_TID), flags);
  
  	if (internal)
  		return iwl_mvm_flush_tx_path(mvm, int_sta->tfd_queue_msk,
  					     flags);
  
  	return iwl_mvm_flush_tx_path(mvm, mvm_sta->tfd_queue_msk, flags);
  }
  