drivers/net/wireless/iwlwifi/mvm/rx.c - arm/linux-arm64-legacy - Git at Google

 /******************************************************************************
  *
  * 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 "iwl-trans.h"
 #include "mvm.h"
 #include "fw-api.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.
  */
 int iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 			  struct iwl_device_cmd *cmd)
 {
 	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

 	return 0;
 }

 /*
  * 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_hdr *hdr, u16 len,
 					    u32 ampdu_status,
 					    struct iwl_rx_cmd_buffer *rxb,
 					    struct ieee80211_rx_status *stats)
 {
 	struct sk_buff *skb;
 	unsigned int hdrlen, fraglen;

 	/* 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;
 	}
 	/* If frame is small enough to fit in skb->head, pull it completely.
 	 * If not, only pull ieee80211_hdr so that splice() or TCP coalesce
 	 * are more efficient.
 	 */
 	hdrlen = (len <= skb_tailroom(skb)) ? len : sizeof(*hdr);

 	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);
 	}

 	memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));

 	ieee80211_rx(mvm->hw, skb);
 }

 /*
  * 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 : -256;
 	energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
 						IWL_RX_INFO_ENERGY_ANT_B_POS;
 	energy_b = energy_b ? -energy_b : -256;
 	energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
 						IWL_RX_INFO_ENERGY_ANT_C_POS;
 	energy_c = energy_c ? -energy_c : -256;
 	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)
 {
 	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;
 		IWL_DEBUG_WEP(mvm, "hw decrypted CCMP successfully\n");
 		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;
 		/* 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;
 		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;
 }

 /*
  * iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
  *
  * Handles the actual data of the Rx packet from the fw
  */
 int iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 		       struct iwl_device_cmd *cmd)
 {
 	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;
 	u32 len;
 	u32 ampdu_status;
 	u32 rate_n_flags;
 	u32 rx_pkt_status;

 	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));

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

 	/*
 	 * 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)) {
 		IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
 			       rx_pkt_status);
 		return 0;
 	}

 	if ((unlikely(phy_info->cfg_phy_cnt > 20))) {
 		IWL_DEBUG_DROP(mvm, "dsp size out of range [0,20]: %d\n",
 			       phy_info->cfg_phy_cnt);
 		return 0;
 	}

 	/*
 	 * 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)) ?
 				IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
 	rx_status.freq =
 		ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
 					       rx_status.band);
 	/*
 	 * TSF as indicated by the fw is at INA time, but mac80211 expects the
 	 * TSF at the beginning of the MPDU.
 	 */
 	/*rx_status.flag |= RX_FLAG_MACTIME_MPDU;*/

 	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);

 	/* 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, &mvm->drv_rx_stats, rate_n_flags,
 				   rx_status.flag & RX_FLAG_AMPDU_DETAILS);
 #endif
 	iwl_mvm_pass_packet_to_mac80211(mvm, hdr, len, ampdu_status,
 					rxb, &rx_status);
 	return 0;
 }

 static void iwl_mvm_update_rx_statistics(struct iwl_mvm *mvm,
 					 struct iwl_notif_statistics *stats)
 {
 	/*
 	 * NOTE FW aggregates the statistics - BUT the statistics are cleared
 	 * when the driver issues REPLY_STATISTICS_CMD 0x9c with CLEAR_STATS
 	 * bit set.
 	 */
 	lockdep_assert_held(&mvm->mutex);
 	memcpy(&mvm->rx_stats, &stats->rx, sizeof(struct mvm_statistics_rx));
 }

 struct iwl_mvm_stat_data {
 	struct iwl_notif_statistics *stats;
 	struct iwl_mvm *mvm;
 };

 static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
 				  struct ieee80211_vif *vif)
 {
 	struct iwl_mvm_stat_data *data = _data;
 	struct iwl_notif_statistics *stats = data->stats;
 	struct iwl_mvm *mvm = data->mvm;
 	int sig = -stats->general.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(stats->rx.general.mac_id);
 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);

 	if (mvmvif->id != id)
 		return;

 	if (vif->type != NL80211_IFTYPE_STATION)
 		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);
 	}
 }

 /*
  * iwl_mvm_rx_statistics - STATISTICS_NOTIFICATION handler
  *
  * TODO: This handler is implemented partially.
  */
 int iwl_mvm_rx_statistics(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_notif_statistics *stats = (void *)&pkt->data;
 	struct mvm_statistics_general_common *common = &stats->general.common;
 	struct iwl_mvm_stat_data data = {
 		.stats = stats,
 		.mvm = mvm,
 	};

 	if (mvm->temperature != le32_to_cpu(common->temperature)) {
 		mvm->temperature = le32_to_cpu(common->temperature);
 		iwl_mvm_tt_handler(mvm);
 	}
 	iwl_mvm_update_rx_statistics(mvm, stats);

 	ieee80211_iterate_active_interfaces(mvm->hw,
 					    IEEE80211_IFACE_ITER_NORMAL,
 					    iwl_mvm_stat_iterator,
 					    &data);
 	return 0;
 }
	/******************************************************************************
	*
	* 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 "iwl-trans.h"
	#include "mvm.h"
	#include "fw-api.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.
	*/
	int iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm mvm, struct iwl_rx_cmd_buffer rxb,
	struct iwl_device_cmd *cmd)
	{
	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

	return 0;
	}

	/*
	* 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_hdr *hdr, u16 len,
	u32 ampdu_status,
	struct iwl_rx_cmd_buffer *rxb,
	struct ieee80211_rx_status *stats)
	{
	struct sk_buff *skb;
	unsigned int hdrlen, fraglen;

	/* 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;
	}
	/* If frame is small enough to fit in skb->head, pull it completely.
	* If not, only pull ieee80211_hdr so that splice() or TCP coalesce
	* are more efficient.
	*/
	hdrlen = (len <= skb_tailroom(skb)) ? len : sizeof(*hdr);

	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);
	}

	memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));

	ieee80211_rx(mvm->hw, skb);
	}

	/*
	* 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 : -256;
	energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
	IWL_RX_INFO_ENERGY_ANT_B_POS;
	energy_b = energy_b ? -energy_b : -256;
	energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
	IWL_RX_INFO_ENERGY_ANT_C_POS;
	energy_c = energy_c ? -energy_c : -256;
	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)
	{
	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;
	IWL_DEBUG_WEP(mvm, "hw decrypted CCMP successfully\n");
	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;
	/* 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;
	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;
	}

	/*
	* iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
	*
	* Handles the actual data of the Rx packet from the fw
	*/
	int iwl_mvm_rx_rx_mpdu(struct iwl_mvm mvm, struct iwl_rx_cmd_buffer rxb,
	struct iwl_device_cmd *cmd)
	{
	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;
	u32 len;
	u32 ampdu_status;
	u32 rate_n_flags;
	u32 rx_pkt_status;

	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));

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

	/*
	* 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)) {
	IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
	rx_pkt_status);
	return 0;
	}

	if ((unlikely(phy_info->cfg_phy_cnt > 20))) {
	IWL_DEBUG_DROP(mvm, "dsp size out of range [0,20]: %d\n",
	phy_info->cfg_phy_cnt);
	return 0;
	}

	/*
	* 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)) ?
	IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
	rx_status.freq =
	ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
	rx_status.band);
	/*
	* TSF as indicated by the fw is at INA time, but mac80211 expects the
	* TSF at the beginning of the MPDU.
	*/
	/rx_status.flag \|= RX_FLAG_MACTIME_MPDU;/

	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);

	/* 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, &mvm->drv_rx_stats, rate_n_flags,
	rx_status.flag & RX_FLAG_AMPDU_DETAILS);
	#endif
	iwl_mvm_pass_packet_to_mac80211(mvm, hdr, len, ampdu_status,
	rxb, &rx_status);
	return 0;
	}

	static void iwl_mvm_update_rx_statistics(struct iwl_mvm *mvm,
	struct iwl_notif_statistics *stats)
	{
	/*
	* NOTE FW aggregates the statistics - BUT the statistics are cleared
	* when the driver issues REPLY_STATISTICS_CMD 0x9c with CLEAR_STATS
	* bit set.
	*/
	lockdep_assert_held(&mvm->mutex);
	memcpy(&mvm->rx_stats, &stats->rx, sizeof(struct mvm_statistics_rx));
	}

	struct iwl_mvm_stat_data {
	struct iwl_notif_statistics *stats;
	struct iwl_mvm *mvm;
	};

	static void iwl_mvm_stat_iterator(void _data, u8 mac,
	struct ieee80211_vif *vif)
	{
	struct iwl_mvm_stat_data *data = _data;
	struct iwl_notif_statistics *stats = data->stats;
	struct iwl_mvm *mvm = data->mvm;
	int sig = -stats->general.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(stats->rx.general.mac_id);
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);

	if (mvmvif->id != id)
	return;

	if (vif->type != NL80211_IFTYPE_STATION)
	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);
	}
	}

	/*
	* iwl_mvm_rx_statistics - STATISTICS_NOTIFICATION handler
	*
	* TODO: This handler is implemented partially.
	*/
	int iwl_mvm_rx_statistics(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_notif_statistics stats = (void )&pkt->data;
	struct mvm_statistics_general_common *common = &stats->general.common;
	struct iwl_mvm_stat_data data = {
	.stats = stats,
	.mvm = mvm,
	};

	if (mvm->temperature != le32_to_cpu(common->temperature)) {
	mvm->temperature = le32_to_cpu(common->temperature);
	iwl_mvm_tt_handler(mvm);
	}
	iwl_mvm_update_rx_statistics(mvm, stats);

	ieee80211_iterate_active_interfaces(mvm->hw,
	IEEE80211_IFACE_ITER_NORMAL,
	iwl_mvm_stat_iterator,
	&data);
	return 0;
	}