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 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
   * 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/etherdevice.h>
  #include <linux/skbuff.h>
  #include "iwl-trans.h"
  #include "mvm.h"
  #include "fw-api.h"
  #include "fw-dbg.h"
  
  /*
   * iwl_mvm_rx_rx_phy_cmd - REPLY_RX_PHY_CMD handler
   *
   * Copies the phy information in mvm->last_phy_info, it will be used when the
   * actual data will come from the fw in the next packet.
   */
  void iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
  {
  	struct iwl_rx_packet *pkt = rxb_addr(rxb);
  
  	memcpy(&mvm->last_phy_info, pkt->data, sizeof(mvm->last_phy_info));
  	mvm->ampdu_ref++;
  
  #ifdef CONFIG_IWLWIFI_DEBUGFS
  	if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
  		spin_lock(&mvm->drv_stats_lock);
  		mvm->drv_rx_stats.ampdu_count++;
  		spin_unlock(&mvm->drv_stats_lock);
  	}
  #endif
  }
  
  /*
   * iwl_mvm_pass_packet_to_mac80211 - builds the packet for mac80211
   *
   * Adds the rxb to a new skb and give it to mac80211
   */
  static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
  					    struct ieee80211_sta *sta,
  					    struct napi_struct *napi,
  					    struct sk_buff *skb,
  					    struct ieee80211_hdr *hdr, u16 len,
  					    u8 crypt_len,
  					    struct iwl_rx_cmd_buffer *rxb)
  {
  	unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
  	unsigned int fraglen;
  
  	/*
  	 * The 'hdrlen' (plus the 8 bytes for the SNAP and the crypt_len,
  	 * but those are all multiples of 4 long) all goes away, but we
  	 * want the *end* of it, which is going to be the start of the IP
  	 * header, to be aligned when it gets pulled in.
  	 * The beginning of the skb->data is aligned on at least a 4-byte
  	 * boundary after allocation. Everything here is aligned at least
  	 * on a 2-byte boundary so we can just take hdrlen & 3 and pad by
  	 * the result.
  	 */
  	skb_reserve(skb, hdrlen & 3);
  
  	/* If frame is small enough to fit in skb->head, pull it completely.
  	 * If not, only pull ieee80211_hdr (including crypto if present, and
  	 * an additional 8 bytes for SNAP/ethertype, see below) so that
  	 * splice() or TCP coalesce are more efficient.
  	 *
  	 * Since, in addition, ieee80211_data_to_8023() always pull in at
  	 * least 8 bytes (possibly more for mesh) we can do the same here
  	 * to save the cost of doing it later. That still doesn't pull in
  	 * the actual IP header since the typical case has a SNAP header.
  	 * If the latter changes (there are efforts in the standards group
  	 * to do so) we should revisit this and ieee80211_data_to_8023().
  	 */
  	hdrlen = (len <= skb_tailroom(skb)) ? len : hdrlen + crypt_len + 8;
  
  	memcpy(skb_put(skb, hdrlen), hdr, hdrlen);
  	fraglen = len - hdrlen;
  
  	if (fraglen) {
  		int offset = (void *)hdr + hdrlen -
  			     rxb_addr(rxb) + rxb_offset(rxb);
  
  		skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
  				fraglen, rxb->truesize);
  	}
  
  	ieee80211_rx_napi(mvm->hw, sta, skb, napi);
  }
  
  /*
   * iwl_mvm_get_signal_strength - use new rx PHY INFO API
   * values are reported by the fw as positive values - need to negate
   * to obtain their dBM.  Account for missing antennas by replacing 0
   * values by -256dBm: practically 0 power and a non-feasible 8 bit value.
   */
  static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
  					struct iwl_rx_phy_info *phy_info,
  					struct ieee80211_rx_status *rx_status)
  {
  	int energy_a, energy_b, energy_c, max_energy;
  	u32 val;
  
  	val =
  	    le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
  	energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
  						IWL_RX_INFO_ENERGY_ANT_A_POS;
  	energy_a = energy_a ? -energy_a : S8_MIN;
  	energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
  						IWL_RX_INFO_ENERGY_ANT_B_POS;
  	energy_b = energy_b ? -energy_b : S8_MIN;
  	energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
  						IWL_RX_INFO_ENERGY_ANT_C_POS;
  	energy_c = energy_c ? -energy_c : S8_MIN;
  	max_energy = max(energy_a, energy_b);
  	max_energy = max(max_energy, energy_c);
  
  	IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
  			energy_a, energy_b, energy_c, max_energy);
  
  	rx_status->signal = max_energy;
  	rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
  				RX_RES_PHY_FLAGS_ANTENNA)
  					>> RX_RES_PHY_FLAGS_ANTENNA_POS;
  	rx_status->chain_signal[0] = energy_a;
  	rx_status->chain_signal[1] = energy_b;
  	rx_status->chain_signal[2] = energy_c;
  }
  
  /*
   * iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
   * @mvm: the mvm object
   * @hdr: 80211 header
   * @stats: status in mac80211's format
   * @rx_pkt_status: status coming from fw
   *
   * returns non 0 value if the packet should be dropped
   */
  static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
  					struct ieee80211_hdr *hdr,
  					struct ieee80211_rx_status *stats,
  					u32 rx_pkt_status,
  					u8 *crypt_len)
  {
  	if (!ieee80211_has_protected(hdr->frame_control) ||
  	    (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
  			     RX_MPDU_RES_STATUS_SEC_NO_ENC)
  		return 0;
  
  	/* packet was encrypted with unknown alg */
  	if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
  					RX_MPDU_RES_STATUS_SEC_ENC_ERR)
  		return 0;
  
  	switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
  	case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
  		/* alg is CCM: check MIC only */
  		if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
  			return -1;
  
  		stats->flag |= RX_FLAG_DECRYPTED;
  		*crypt_len = IEEE80211_CCMP_HDR_LEN;
  		return 0;
  
  	case RX_MPDU_RES_STATUS_SEC_TKIP_ENC:
  		/* Don't drop the frame and decrypt it in SW */
  		if (!(rx_pkt_status & RX_MPDU_RES_STATUS_TTAK_OK))
  			return 0;
  		*crypt_len = IEEE80211_TKIP_IV_LEN;
  		/* fall through if TTAK OK */
  
  	case RX_MPDU_RES_STATUS_SEC_WEP_ENC:
  		if (!(rx_pkt_status & RX_MPDU_RES_STATUS_ICV_OK))
  			return -1;
  
  		stats->flag |= RX_FLAG_DECRYPTED;
  		if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
  				RX_MPDU_RES_STATUS_SEC_WEP_ENC)
  			*crypt_len = IEEE80211_WEP_IV_LEN;
  		return 0;
  
  	case RX_MPDU_RES_STATUS_SEC_EXT_ENC:
  		if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
  			return -1;
  		stats->flag |= RX_FLAG_DECRYPTED;
  		return 0;
  
  	default:
  		IWL_ERR(mvm, "Unhandled alg: 0x%x\n", rx_pkt_status);
  	}
  
  	return 0;
  }
  
  static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
  			    struct sk_buff *skb,
  			    u32 status)
  {
  	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
  	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
  
  	if (mvmvif->features & NETIF_F_RXCSUM &&
  	    status & RX_MPDU_RES_STATUS_CSUM_DONE &&
  	    status & RX_MPDU_RES_STATUS_CSUM_OK)
  		skb->ip_summed = CHECKSUM_UNNECESSARY;
  }
  
  /*
   * iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
   *
   * Handles the actual data of the Rx packet from the fw
   */
  void iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct napi_struct *napi,
  			struct iwl_rx_cmd_buffer *rxb)
  {
  	struct ieee80211_hdr *hdr;
  	struct ieee80211_rx_status *rx_status;
  	struct iwl_rx_packet *pkt = rxb_addr(rxb);
  	struct iwl_rx_phy_info *phy_info;
  	struct iwl_rx_mpdu_res_start *rx_res;
  	struct ieee80211_sta *sta = NULL;
  	struct sk_buff *skb;
  	u32 len;
  	u32 rate_n_flags;
  	u32 rx_pkt_status;
  	u8 crypt_len = 0;
  	bool take_ref;
  
  	phy_info = &mvm->last_phy_info;
  	rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data;
  	hdr = (struct ieee80211_hdr *)(pkt->data + sizeof(*rx_res));
  	len = le16_to_cpu(rx_res->byte_count);
  	rx_pkt_status = le32_to_cpup((__le32 *)
  		(pkt->data + sizeof(*rx_res) + len));
  
  	/* Dont use dev_alloc_skb(), we'll have enough headroom once
  	 * ieee80211_hdr pulled.
  	 */
  	skb = alloc_skb(128, GFP_ATOMIC);
  	if (!skb) {
  		IWL_ERR(mvm, "alloc_skb failed\n");
  		return;
  	}
  
  	rx_status = IEEE80211_SKB_RXCB(skb);
  
  	/*
  	 * drop the packet if it has failed being decrypted by HW
  	 */
  	if (iwl_mvm_set_mac80211_rx_flag(mvm, hdr, rx_status, rx_pkt_status,
  					 &crypt_len)) {
  		IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
  			       rx_pkt_status);
  		kfree_skb(skb);
  		return;
  	}
  
  	/*
  	 * Keep packets with CRC errors (and with overrun) for monitor mode
  	 * (otherwise the firmware discards them) but mark them as bad.
  	 */
  	if (!(rx_pkt_status & RX_MPDU_RES_STATUS_CRC_OK) ||
  	    !(rx_pkt_status & RX_MPDU_RES_STATUS_OVERRUN_OK)) {
  		IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", rx_pkt_status);
  		rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
  	}
  
  	/* This will be used in several places later */
  	rate_n_flags = le32_to_cpu(phy_info->rate_n_flags);
  
  	/* rx_status carries information about the packet to mac80211 */
  	rx_status->mactime = le64_to_cpu(phy_info->timestamp);
  	rx_status->device_timestamp = le32_to_cpu(phy_info->system_timestamp);
  	rx_status->band =
  		(phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
  				NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
  	rx_status->freq =
  		ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
  					       rx_status->band);
  
  	/* TSF as indicated by the firmware  is at INA time */
  	rx_status->flag |= RX_FLAG_MACTIME_PLCP_START;
  
  	iwl_mvm_get_signal_strength(mvm, phy_info, rx_status);
  
  	IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status->signal,
  			      (unsigned long long)rx_status->mactime);
  
  	rcu_read_lock();
  	if (rx_pkt_status & RX_MPDU_RES_STATUS_SRC_STA_FOUND) {
  		u32 id = rx_pkt_status & RX_MPDU_RES_STATUS_STA_ID_MSK;
  
  		id >>= RX_MDPU_RES_STATUS_STA_ID_SHIFT;
  
  		if (!WARN_ON_ONCE(id >= IWL_MVM_STATION_COUNT)) {
  			sta = rcu_dereference(mvm->fw_id_to_mac_id[id]);
  			if (IS_ERR(sta))
  				sta = NULL;
  		}
  	} else if (!is_multicast_ether_addr(hdr->addr2)) {
  		/* This is fine since we prevent two stations with the same
  		 * address from being added.
  		 */
  		sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
  	}
  
  	if (sta) {
  		struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
  		struct ieee80211_vif *tx_blocked_vif =
  			rcu_dereference(mvm->csa_tx_blocked_vif);
  
  		/* We have tx blocked stations (with CS bit). If we heard
  		 * frames from a blocked station on a new channel we can
  		 * TX to it again.
  		 */
  		if (unlikely(tx_blocked_vif) &&
  		    mvmsta->vif == tx_blocked_vif) {
  			struct iwl_mvm_vif *mvmvif =
  				iwl_mvm_vif_from_mac80211(tx_blocked_vif);
  
  			if (mvmvif->csa_target_freq == rx_status->freq)
  				iwl_mvm_sta_modify_disable_tx_ap(mvm, sta,
  								 false);
  		}
  
  		rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status);
  
  		if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) &&
  		    ieee80211_is_beacon(hdr->frame_control)) {
  			struct iwl_fw_dbg_trigger_tlv *trig;
  			struct iwl_fw_dbg_trigger_low_rssi *rssi_trig;
  			bool trig_check;
  			s32 rssi;
  
  			trig = iwl_fw_dbg_get_trigger(mvm->fw,
  						      FW_DBG_TRIGGER_RSSI);
  			rssi_trig = (void *)trig->data;
  			rssi = le32_to_cpu(rssi_trig->rssi);
  
  			trig_check =
  				iwl_fw_dbg_trigger_check_stop(mvm, mvmsta->vif,
  							      trig);
  			if (trig_check && rx_status->signal < rssi)
  				iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL);
  		}
  
  		if (ieee80211_is_data(hdr->frame_control))
  			iwl_mvm_rx_csum(sta, skb, rx_pkt_status);
  	}
  	rcu_read_unlock();
  
  	/* set the preamble flag if appropriate */
  	if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
  		rx_status->flag |= RX_FLAG_SHORTPRE;
  
  	if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
  		/*
  		 * We know which subframes of an A-MPDU belong
  		 * together since we get a single PHY response
  		 * from the firmware for all of them
  		 */
  		rx_status->flag |= RX_FLAG_AMPDU_DETAILS;
  		rx_status->ampdu_reference = mvm->ampdu_ref;
  	}
  
  	/* Set up the HT phy flags */
  	switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
  	case RATE_MCS_CHAN_WIDTH_20:
  		break;
  	case RATE_MCS_CHAN_WIDTH_40:
  		rx_status->flag |= RX_FLAG_40MHZ;
  		break;
  	case RATE_MCS_CHAN_WIDTH_80:
  		rx_status->vht_flag |= RX_VHT_FLAG_80MHZ;
  		break;
  	case RATE_MCS_CHAN_WIDTH_160:
  		rx_status->vht_flag |= RX_VHT_FLAG_160MHZ;
  		break;
  	}
  	if (rate_n_flags & RATE_MCS_SGI_MSK)
  		rx_status->flag |= RX_FLAG_SHORT_GI;
  	if (rate_n_flags & RATE_HT_MCS_GF_MSK)
  		rx_status->flag |= RX_FLAG_HT_GF;
  	if (rate_n_flags & RATE_MCS_LDPC_MSK)
  		rx_status->flag |= RX_FLAG_LDPC;
  	if (rate_n_flags & RATE_MCS_HT_MSK) {
  		u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >>
  				RATE_MCS_STBC_POS;
  		rx_status->flag |= RX_FLAG_HT;
  		rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
  		rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
  	} else if (rate_n_flags & RATE_MCS_VHT_MSK) {
  		u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >>
  				RATE_MCS_STBC_POS;
  		rx_status->vht_nss =
  			((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
  						RATE_VHT_MCS_NSS_POS) + 1;
  		rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
  		rx_status->flag |= RX_FLAG_VHT;
  		rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT;
  		if (rate_n_flags & RATE_MCS_BF_MSK)
  			rx_status->vht_flag |= RX_VHT_FLAG_BF;
  	} else {
  		rx_status->rate_idx =
  			iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
  							    rx_status->band);
  	}
  
  #ifdef CONFIG_IWLWIFI_DEBUGFS
  	iwl_mvm_update_frame_stats(mvm, rate_n_flags,
  				   rx_status->flag & RX_FLAG_AMPDU_DETAILS);
  #endif
  
  	if (unlikely((ieee80211_is_beacon(hdr->frame_control) ||
  		      ieee80211_is_probe_resp(hdr->frame_control)) &&
  		     mvm->sched_scan_pass_all == SCHED_SCAN_PASS_ALL_ENABLED))
  		mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND;
  
  	if (unlikely(ieee80211_is_beacon(hdr->frame_control) ||
  		     ieee80211_is_probe_resp(hdr->frame_control)))
  		rx_status->boottime_ns = ktime_get_boot_ns();
  
  	/* Take a reference briefly to kick off a d0i3 entry delay so
  	 * we can handle bursts of RX packets without toggling the
  	 * state too often.  But don't do this for beacons if we are
  	 * going to idle because the beacon filtering changes we make
  	 * cause the firmware to send us collateral beacons. */
  	take_ref = !(test_bit(STATUS_TRANS_GOING_IDLE, &mvm->trans->status) &&
  		     ieee80211_is_beacon(hdr->frame_control));
  
  	if (take_ref)
  		iwl_mvm_ref(mvm, IWL_MVM_REF_RX);
  
  	iwl_mvm_pass_packet_to_mac80211(mvm, sta, napi, skb, hdr, len,
  					crypt_len, rxb);
  
  	if (take_ref)
  		iwl_mvm_unref(mvm, IWL_MVM_REF_RX);
  }
  
  static void iwl_mvm_update_rx_statistics(struct iwl_mvm *mvm,
  					 struct mvm_statistics_rx *rx_stats)
  {
  	lockdep_assert_held(&mvm->mutex);
  
  	mvm->rx_stats = *rx_stats;
  }
  
  struct iwl_mvm_stat_data {
  	struct iwl_mvm *mvm;
  	__le32 mac_id;
  	u8 beacon_filter_average_energy;
  	struct mvm_statistics_general_v8 *general;
  	struct mvm_statistics_load *load;
  };
  
  static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
  				  struct ieee80211_vif *vif)
  {
  	struct iwl_mvm_stat_data *data = _data;
  	struct iwl_mvm *mvm = data->mvm;
  	int sig = -data->beacon_filter_average_energy;
  	int last_event;
  	int thold = vif->bss_conf.cqm_rssi_thold;
  	int hyst = vif->bss_conf.cqm_rssi_hyst;
  	u16 id = le32_to_cpu(data->mac_id);
  	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
  
  	/* This doesn't need the MAC ID check since it's not taking the
  	 * data copied into the "data" struct, but rather the data from
  	 * the notification directly.
  	 */
  	if (data->general) {
  		mvmvif->beacon_stats.num_beacons =
  			le32_to_cpu(data->general->beacon_counter[mvmvif->id]);
  		mvmvif->beacon_stats.avg_signal =
  			-data->general->beacon_average_energy[mvmvif->id];
  	}
  
  	if (mvmvif->id != id)
  		return;
  
  	if (vif->type != NL80211_IFTYPE_STATION)
  		return;
  
  	if (sig == 0) {
  		IWL_DEBUG_RX(mvm, "RSSI is 0 - skip signal based decision\n");
  		return;
  	}
  
  	mvmvif->bf_data.ave_beacon_signal = sig;
  
  	/* BT Coex */
  	if (mvmvif->bf_data.bt_coex_min_thold !=
  	    mvmvif->bf_data.bt_coex_max_thold) {
  		last_event = mvmvif->bf_data.last_bt_coex_event;
  		if (sig > mvmvif->bf_data.bt_coex_max_thold &&
  		    (last_event <= mvmvif->bf_data.bt_coex_min_thold ||
  		     last_event == 0)) {
  			mvmvif->bf_data.last_bt_coex_event = sig;
  			IWL_DEBUG_RX(mvm, "cqm_iterator bt coex high %d\n",
  				     sig);
  			iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_HIGH);
  		} else if (sig < mvmvif->bf_data.bt_coex_min_thold &&
  			   (last_event >= mvmvif->bf_data.bt_coex_max_thold ||
  			    last_event == 0)) {
  			mvmvif->bf_data.last_bt_coex_event = sig;
  			IWL_DEBUG_RX(mvm, "cqm_iterator bt coex low %d\n",
  				     sig);
  			iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_LOW);
  		}
  	}
  
  	if (!(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
  		return;
  
  	/* CQM Notification */
  	last_event = mvmvif->bf_data.last_cqm_event;
  	if (thold && sig < thold && (last_event == 0 ||
  				     sig < last_event - hyst)) {
  		mvmvif->bf_data.last_cqm_event = sig;
  		IWL_DEBUG_RX(mvm, "cqm_iterator cqm low %d\n",
  			     sig);
  		ieee80211_cqm_rssi_notify(
  			vif,
  			NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
  			GFP_KERNEL);
  	} else if (sig > thold &&
  		   (last_event == 0 || sig > last_event + hyst)) {
  		mvmvif->bf_data.last_cqm_event = sig;
  		IWL_DEBUG_RX(mvm, "cqm_iterator cqm high %d\n",
  			     sig);
  		ieee80211_cqm_rssi_notify(
  			vif,
  			NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
  			GFP_KERNEL);
  	}
  }
  
  static inline void
  iwl_mvm_rx_stats_check_trigger(struct iwl_mvm *mvm, struct iwl_rx_packet *pkt)
  {
  	struct iwl_fw_dbg_trigger_tlv *trig;
  	struct iwl_fw_dbg_trigger_stats *trig_stats;
  	u32 trig_offset, trig_thold;
  
  	if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_STATS))
  		return;
  
  	trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_STATS);
  	trig_stats = (void *)trig->data;
  
  	if (!iwl_fw_dbg_trigger_check_stop(mvm, NULL, trig))
  		return;
  
  	trig_offset = le32_to_cpu(trig_stats->stop_offset);
  	trig_thold = le32_to_cpu(trig_stats->stop_threshold);
  
  	if (WARN_ON_ONCE(trig_offset >= iwl_rx_packet_payload_len(pkt)))
  		return;
  
  	if (le32_to_cpup((__le32 *) (pkt->data + trig_offset)) < trig_thold)
  		return;
  
  	iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL);
  }
  
  void iwl_mvm_handle_rx_statistics(struct iwl_mvm *mvm,
  				  struct iwl_rx_packet *pkt)
  {
  	struct iwl_notif_statistics_v11 *stats = (void *)&pkt->data;
  	struct iwl_mvm_stat_data data = {
  		.mvm = mvm,
  	};
  	int expected_size = iwl_mvm_has_new_rx_api(mvm) ? sizeof(*stats) :
  			    sizeof(struct iwl_notif_statistics_v10);
  	u32 temperature;
  
  	if (iwl_rx_packet_payload_len(pkt) != expected_size)
  		goto invalid;
  
  	temperature = le32_to_cpu(stats->general.radio_temperature);
  	data.mac_id = stats->rx.general.mac_id;
  	data.beacon_filter_average_energy =
  		stats->general.beacon_filter_average_energy;
  
  	iwl_mvm_update_rx_statistics(mvm, &stats->rx);
  
  	mvm->radio_stats.rx_time = le64_to_cpu(stats->general.rx_time);
  	mvm->radio_stats.tx_time = le64_to_cpu(stats->general.tx_time);
  	mvm->radio_stats.on_time_rf =
  		le64_to_cpu(stats->general.on_time_rf);
  	mvm->radio_stats.on_time_scan =
  		le64_to_cpu(stats->general.on_time_scan);
  
  	data.general = &stats->general;
  	if (iwl_mvm_has_new_rx_api(mvm)) {
  		int i;
  
  		data.load = &stats->load_stats;
  
  		rcu_read_lock();
  		for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
  			struct iwl_mvm_sta *sta;
  
  			if (!data.load->avg_energy[i])
  				continue;
  
  			sta = iwl_mvm_sta_from_staid_rcu(mvm, i);
  			if (!sta)
  				continue;
  			sta->avg_energy = data.load->avg_energy[i];
  		}
  		rcu_read_unlock();
  	}
  
  	iwl_mvm_rx_stats_check_trigger(mvm, pkt);
  
  	ieee80211_iterate_active_interfaces(mvm->hw,
  					    IEEE80211_IFACE_ITER_NORMAL,
  					    iwl_mvm_stat_iterator,
  					    &data);
  	return;
   invalid:
  	IWL_ERR(mvm, "received invalid statistics size (%d)!\n",
  		iwl_rx_packet_payload_len(pkt));
  }
  
  void iwl_mvm_rx_statistics(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
  {
  	iwl_mvm_handle_rx_statistics(mvm, rxb_addr(rxb));
  }
  
  void iwl_mvm_window_status_notif(struct iwl_mvm *mvm,
  				 struct iwl_rx_cmd_buffer *rxb)
  {
  	struct iwl_rx_packet *pkt = rxb_addr(rxb);
  	struct iwl_ba_window_status_notif *notif = (void *)pkt->data;
  	int i;
  	u32 pkt_len = iwl_rx_packet_payload_len(pkt);
  
  	if (WARN_ONCE(pkt_len != sizeof(*notif),
  		      "Received window status notification of wrong size (%u)\n",
  		      pkt_len))
  		return;
  
  	rcu_read_lock();
  	for (i = 0; i < BA_WINDOW_STREAMS_MAX; i++) {
  		struct ieee80211_sta *sta;
  		u8 sta_id, tid;
  		u64 bitmap;
  		u32 ssn;
  		u16 ratid;
  		u16 received_mpdu;
  
  		ratid = le16_to_cpu(notif->ra_tid[i]);
  		/* check that this TID is valid */
  		if (!(ratid & BA_WINDOW_STATUS_VALID_MSK))
  			continue;
  
  		received_mpdu = le16_to_cpu(notif->mpdu_rx_count[i]);
  		if (received_mpdu == 0)
  			continue;
  
  		tid = ratid & BA_WINDOW_STATUS_TID_MSK;
  		/* get the station */
  		sta_id = (ratid & BA_WINDOW_STATUS_STA_ID_MSK)
  			 >> BA_WINDOW_STATUS_STA_ID_POS;
  		sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
  		if (IS_ERR_OR_NULL(sta))
  			continue;
  		bitmap = le64_to_cpu(notif->bitmap[i]);
  		ssn = le32_to_cpu(notif->start_seq_num[i]);
  
  		/* update mac80211 with the bitmap for the reordering buffer */
  		ieee80211_mark_rx_ba_filtered_frames(sta, tid, ssn, bitmap,
  						     received_mpdu);
  	}
  	rcu_read_unlock();
  }
  