[deliverable/linux.git] / drivers / net / wireless / iwlwifi / mvm / rx.c

/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2012 - 2013 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 - 2013 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++;
	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_ni(mvm->hw, skb);
}

static void iwl_mvm_calc_rssi(struct iwl_mvm *mvm,
			      struct iwl_rx_phy_info *phy_info,
			      struct ieee80211_rx_status *rx_status)
{
	int rssi_a, rssi_b, rssi_a_dbm, rssi_b_dbm, max_rssi_dbm;
	int rssi_all_band_a, rssi_all_band_b;
	u32 agc_a, agc_b, max_agc;
	u32 val;

	val = le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_AGC_IDX]);
	agc_a = (val & IWL_OFDM_AGC_A_MSK) >> IWL_OFDM_AGC_A_POS;
	agc_b = (val & IWL_OFDM_AGC_B_MSK) >> IWL_OFDM_AGC_B_POS;
	max_agc = max_t(u32, agc_a, agc_b);

	val = le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_RSSI_AB_IDX]);
	rssi_a = (val & IWL_OFDM_RSSI_INBAND_A_MSK) >> IWL_OFDM_RSSI_A_POS;
	rssi_b = (val & IWL_OFDM_RSSI_INBAND_B_MSK) >> IWL_OFDM_RSSI_B_POS;
	rssi_all_band_a = (val & IWL_OFDM_RSSI_ALLBAND_A_MSK) >>
				IWL_OFDM_RSSI_ALLBAND_A_POS;
	rssi_all_band_b = (val & IWL_OFDM_RSSI_ALLBAND_B_MSK) >>
				IWL_OFDM_RSSI_ALLBAND_B_POS;

	/*
	 * dBm = rssi dB - agc dB - constant.
	 * Higher AGC (higher radio gain) means lower signal.
	 */
	rssi_a_dbm = rssi_a - IWL_RSSI_OFFSET - agc_a;
	rssi_b_dbm = rssi_b - IWL_RSSI_OFFSET - agc_b;
	max_rssi_dbm = max_t(int, rssi_a_dbm, rssi_b_dbm);

	IWL_DEBUG_STATS(mvm, "Rssi In A %d B %d Max %d AGCA %d AGCB %d\n",
			rssi_a_dbm, rssi_b_dbm, max_rssi_dbm, agc_a, agc_b);

	rx_status->signal = max_rssi_dbm;
	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] = rssi_a_dbm;
	rx_status->chain_signal[1] = rssi_b_dbm;
}

/*
 * 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;

	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;
	}

	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);
		return 0;
	}

	/* 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;*/

	if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_RX_ENERGY_API)
		iwl_mvm_get_signal_strength(mvm, phy_info, &rx_status);
	else
		iwl_mvm_calc_rssi(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.flag |= RX_FLAG_80MHZ;
		break;
	case RATE_MCS_CHAN_WIDTH_160:
		rx_status.flag |= RX_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_HT_MSK) {
		rx_status.flag |= RX_FLAG_HT;
		rx_status.rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
	} else if (rate_n_flags & RATE_MCS_VHT_MSK) {
		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;
	} else {
		rx_status.rate_idx =
			iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
							    rx_status.band);
	}

	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;
}
Commit	Line	Data
8ca151b5 JB	1	/******************************************************************************
	2	*
	3	* This file is provided under a dual BSD/GPLv2 license. When using or
	4	* redistributing this file, you may do so under either license.
	5	*
	6	* GPL LICENSE SUMMARY
	7	*
	8	* Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of version 2 of the GNU General Public License as
	12	* published by the Free Software Foundation.
	13	*
	14	* This program is distributed in the hope that it will be useful, but
	15	* WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
	22	* USA
	23	*
	24	* The full GNU General Public License is included in this distribution
410dc5aa	25	* in the file called COPYING.
8ca151b5 JB	26	*
	27	* Contact Information:
	28	* Intel Linux Wireless <ilw@linux.intel.com>
	29	* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
	30	*
	31	* BSD LICENSE
	32	*
	33	* Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
	34	* All rights reserved.
	35	*
	36	* Redistribution and use in source and binary forms, with or without
	37	* modification, are permitted provided that the following conditions
	38	* are met:
	39	*
	40	* * Redistributions of source code must retain the above copyright
	41	* notice, this list of conditions and the following disclaimer.
	42	* * Redistributions in binary form must reproduce the above copyright
	43	* notice, this list of conditions and the following disclaimer in
	44	* the documentation and/or other materials provided with the
	45	* distribution.
	46	* * Neither the name Intel Corporation nor the names of its
	47	* contributors may be used to endorse or promote products derived
	48	* from this software without specific prior written permission.
	49	*
	50	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	51	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	52	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	53	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	54	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	55	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	56	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	57	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	58	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	59	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	60	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	61	*****************************************************************************/
	62	#include "iwl-trans.h"
	63
	64	#include "mvm.h"
	65	#include "fw-api.h"
	66
	67	/*
	68	* iwl_mvm_rx_rx_phy_cmd - REPLY_RX_PHY_CMD handler
	69	*
	70	* Copies the phy information in mvm->last_phy_info, it will be used when the
	71	* actual data will come from the fw in the next packet.
	72	*/
	73	int iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm mvm, struct iwl_rx_cmd_buffer rxb,
	74	struct iwl_device_cmd *cmd)
	75	{
	76	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	77
	78	memcpy(&mvm->last_phy_info, pkt->data, sizeof(mvm->last_phy_info));
	79	mvm->ampdu_ref++;
	80	return 0;
	81	}
	82
	83	/*
	84	* iwl_mvm_pass_packet_to_mac80211 - builds the packet for mac80211
	85	*
	86	* Adds the rxb to a new skb and give it to mac80211
	87	*/
	88	static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
	89	struct ieee80211_hdr *hdr, u16 len,
90	u32 ampdu_status,
91	struct iwl_rx_cmd_buffer *rxb,
92	struct ieee80211_rx_status *stats)
93	{
94	struct sk_buff *skb;
95	unsigned int hdrlen, fraglen;
96
97	/* Dont use dev_alloc_skb(), we'll have enough headroom once
98	* ieee80211_hdr pulled.
99	*/
100	skb = alloc_skb(128, GFP_ATOMIC);
101	if (!skb) {
102	IWL_ERR(mvm, "alloc_skb failed\n");
103	return;
104	}
105	/* If frame is small enough to fit in skb->head, pull it completely.
106	* If not, only pull ieee80211_hdr so that splice() or TCP coalesce
107	* are more efficient.
108	*/
109	hdrlen = (len <= skb_tailroom(skb)) ? len : sizeof(*hdr);
110
111	memcpy(skb_put(skb, hdrlen), hdr, hdrlen);
112	fraglen = len - hdrlen;
113
114	if (fraglen) {
115	int offset = (void *)hdr + hdrlen -
116	rxb_addr(rxb) + rxb_offset(rxb);
117
118	skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
119	fraglen, rxb->truesize);
120	}
121
122	memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
123
2bfb5092	124	ieee80211_rx_ni(mvm->hw, skb);
8ca151b5 JB	125	}
8ca151b5 JB	126
226eb8cd JB	127	static void iwl_mvm_calc_rssi(struct iwl_mvm *mvm,
	128	struct iwl_rx_phy_info *phy_info,
	129	struct ieee80211_rx_status *rx_status)
8ca151b5	130	{
8101a7f0 EG	131	int rssi_a, rssi_b, rssi_a_dbm, rssi_b_dbm, max_rssi_dbm;
	132	int rssi_all_band_a, rssi_all_band_b;
	133	u32 agc_a, agc_b, max_agc;
8ca151b5 JB	134	u32 val;
8ca151b5 JB	135
8101a7f0 EG	136	val = le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_AGC_IDX]);
	137	agc_a = (val & IWL_OFDM_AGC_A_MSK) >> IWL_OFDM_AGC_A_POS;
	138	agc_b = (val & IWL_OFDM_AGC_B_MSK) >> IWL_OFDM_AGC_B_POS;
	139	max_agc = max_t(u32, agc_a, agc_b);
	140
8ca151b5 JB	141	val = le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_RSSI_AB_IDX]);
	142	rssi_a = (val & IWL_OFDM_RSSI_INBAND_A_MSK) >> IWL_OFDM_RSSI_A_POS;
	143	rssi_b = (val & IWL_OFDM_RSSI_INBAND_B_MSK) >> IWL_OFDM_RSSI_B_POS;
8101a7f0 EG	144	rssi_all_band_a = (val & IWL_OFDM_RSSI_ALLBAND_A_MSK) >>
	145	IWL_OFDM_RSSI_ALLBAND_A_POS;
	146	rssi_all_band_b = (val & IWL_OFDM_RSSI_ALLBAND_B_MSK) >>
	147	IWL_OFDM_RSSI_ALLBAND_B_POS;
	148
	149	/*
	150	* dBm = rssi dB - agc dB - constant.
	151	* Higher AGC (higher radio gain) means lower signal.
	152	*/
	153	rssi_a_dbm = rssi_a - IWL_RSSI_OFFSET - agc_a;
	154	rssi_b_dbm = rssi_b - IWL_RSSI_OFFSET - agc_b;
	155	max_rssi_dbm = max_t(int, rssi_a_dbm, rssi_b_dbm);
8ca151b5	156
8101a7f0 EG	157	IWL_DEBUG_STATS(mvm, "Rssi In A %d B %d Max %d AGCA %d AGCB %d\n",
8101a7f0 EG	158	rssi_a_dbm, rssi_b_dbm, max_rssi_dbm, agc_a, agc_b);
8ca151b5	159
226eb8cd JB	160	rx_status->signal = max_rssi_dbm;
	161	rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
	162	RX_RES_PHY_FLAGS_ANTENNA)
	163	>> RX_RES_PHY_FLAGS_ANTENNA_POS;
	164	rx_status->chain_signal[0] = rssi_a_dbm;
	165	rx_status->chain_signal[1] = rssi_b_dbm;
8ca151b5 JB	166	}
8ca151b5 JB	167
a2d7b870 AA	168	/*
a2d7b870 AA	169	* iwl_mvm_get_signal_strength - use new rx PHY INFO API
17dbe564 AA	170	* values are reported by the fw as positive values - need to negate
	171	* to obtain their dBM. Account for missing antennas by replacing 0
	172	* values by -256dBm: practically 0 power and a non-feasible 8 bit value.
a2d7b870	173	*/
226eb8cd JB	174	static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
	175	struct iwl_rx_phy_info *phy_info,
	176	struct ieee80211_rx_status *rx_status)
a2d7b870 AA	177	{
	178	int energy_a, energy_b, energy_c, max_energy;
	179	u32 val;
	180
	181	val =
	182	le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
17dbe564 AA	183	energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
	184	IWL_RX_INFO_ENERGY_ANT_A_POS;
	185	energy_a = energy_a ? -energy_a : -256;
	186	energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
	187	IWL_RX_INFO_ENERGY_ANT_B_POS;
	188	energy_b = energy_b ? -energy_b : -256;
	189	energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
	190	IWL_RX_INFO_ENERGY_ANT_C_POS;
	191	energy_c = energy_c ? -energy_c : -256;
a2d7b870 AA	192	max_energy = max(energy_a, energy_b);
	193	max_energy = max(max_energy, energy_c);
	194
	195	IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
	196	energy_a, energy_b, energy_c, max_energy);
	197
226eb8cd JB	198	rx_status->signal = max_energy;
	199	rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
	200	RX_RES_PHY_FLAGS_ANTENNA)
	201	>> RX_RES_PHY_FLAGS_ANTENNA_POS;
	202	rx_status->chain_signal[0] = energy_a;
	203	rx_status->chain_signal[1] = energy_b;
	204	rx_status->chain_signal[2] = energy_c;
a2d7b870 AA	205	}
a2d7b870 AA	206
8ca151b5 JB	207	/*
	208	* iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
	209	* @mvm: the mvm object
	210	* @hdr: 80211 header
	211	* @stats: status in mac80211's format
	212	* @rx_pkt_status: status coming from fw
	213	*
	214	* returns non 0 value if the packet should be dropped
	215	*/
	216	static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
	217	struct ieee80211_hdr *hdr,
	218	struct ieee80211_rx_status *stats,
	219	u32 rx_pkt_status)
	220	{
	221	if (!ieee80211_has_protected(hdr->frame_control) \|\|
	222	(rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
	223	RX_MPDU_RES_STATUS_SEC_NO_ENC)
	224	return 0;
	225
	226	/* packet was encrypted with unknown alg */
	227	if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
	228	RX_MPDU_RES_STATUS_SEC_ENC_ERR)
	229	return 0;
	230
	231	switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
	232	case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
	233	/* alg is CCM: check MIC only */
	234	if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
	235	return -1;
	236
	237	stats->flag \|= RX_FLAG_DECRYPTED;
	238	IWL_DEBUG_WEP(mvm, "hw decrypted CCMP successfully\n");
	239	return 0;
	240
	241	case RX_MPDU_RES_STATUS_SEC_TKIP_ENC:
	242	/* Don't drop the frame and decrypt it in SW */
	243	if (!(rx_pkt_status & RX_MPDU_RES_STATUS_TTAK_OK))
	244	return 0;
	245	/* fall through if TTAK OK */
	246
	247	case RX_MPDU_RES_STATUS_SEC_WEP_ENC:
	248	if (!(rx_pkt_status & RX_MPDU_RES_STATUS_ICV_OK))
	249	return -1;
	250
	251	stats->flag \|= RX_FLAG_DECRYPTED;
	252	return 0;
	253
	254	default:
	255	IWL_ERR(mvm, "Unhandled alg: 0x%x\n", rx_pkt_status);
	256	}
	257
	258	return 0;
	259	}
	260
	261	/*
	262	* iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
	263	*
	264	* Handles the actual data of the Rx packet from the fw
	265	*/
	266	int iwl_mvm_rx_rx_mpdu(struct iwl_mvm mvm, struct iwl_rx_cmd_buffer rxb,
	267	struct iwl_device_cmd *cmd)
	268	{
	269	struct ieee80211_hdr *hdr;
	270	struct ieee80211_rx_status rx_status = {};
271	struct iwl_rx_packet *pkt = rxb_addr(rxb);
272	struct iwl_rx_phy_info *phy_info;
273	struct iwl_rx_mpdu_res_start *rx_res;
274	u32 len;
275	u32 ampdu_status;
276	u32 rate_n_flags;
277	u32 rx_pkt_status;
278
279	phy_info = &mvm->last_phy_info;
280	rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data;
281	hdr = (struct ieee80211_hdr )(pkt->data + sizeof(rx_res));
282	len = le16_to_cpu(rx_res->byte_count);
283	rx_pkt_status = le32_to_cpup((__le32 *)
284	(pkt->data + sizeof(*rx_res) + len));
285
286	memset(&rx_status, 0, sizeof(rx_status));
287
288	/*
289	* drop the packet if it has failed being decrypted by HW
290	*/
291	if (iwl_mvm_set_mac80211_rx_flag(mvm, hdr, &rx_status, rx_pkt_status)) {
292	IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
293	rx_pkt_status);
294	return 0;
295	}
296
297	if ((unlikely(phy_info->cfg_phy_cnt > 20))) {
298	IWL_DEBUG_DROP(mvm, "dsp size out of range [0,20]: %d\n",
299	phy_info->cfg_phy_cnt);
300	return 0;
301	}
302
303	if (!(rx_pkt_status & RX_MPDU_RES_STATUS_CRC_OK) \|\|
304	!(rx_pkt_status & RX_MPDU_RES_STATUS_OVERRUN_OK)) {
305	IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", rx_pkt_status);
306	return 0;
307	}
308
309	/* This will be used in several places later */
310	rate_n_flags = le32_to_cpu(phy_info->rate_n_flags);
311
312	/* rx_status carries information about the packet to mac80211 */
313	rx_status.mactime = le64_to_cpu(phy_info->timestamp);
d2931bbd	314	rx_status.device_timestamp = le32_to_cpu(phy_info->system_timestamp);
8ca151b5 JB	315	rx_status.band =
	316	(phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
	317	IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
	318	rx_status.freq =
	319	ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
	320	rx_status.band);
	321	/*
	322	* TSF as indicated by the fw is at INA time, but mac80211 expects the
	323	* TSF at the beginning of the MPDU.
	324	*/
	325	/rx_status.flag \|= RX_FLAG_MACTIME_MPDU;/
	326
a2d7b870	327	if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_RX_ENERGY_API)
226eb8cd	328	iwl_mvm_get_signal_strength(mvm, phy_info, &rx_status);
a2d7b870	329	else
226eb8cd	330	iwl_mvm_calc_rssi(mvm, phy_info, &rx_status);
8ca151b5 JB	331
	332	IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status.signal,
	333	(unsigned long long)rx_status.mactime);
	334
8ca151b5 JB	335	/* set the preamble flag if appropriate */
	336	if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
	337	rx_status.flag \|= RX_FLAG_SHORTPRE;
	338
	339	if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
	340	/*
	341	* We know which subframes of an A-MPDU belong
	342	* together since we get a single PHY response
	343	* from the firmware for all of them
	344	*/
	345	rx_status.flag \|= RX_FLAG_AMPDU_DETAILS;
	346	rx_status.ampdu_reference = mvm->ampdu_ref;
	347	}
	348
	349	/* Set up the HT phy flags */
	350	switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
	351	case RATE_MCS_CHAN_WIDTH_20:
	352	break;
	353	case RATE_MCS_CHAN_WIDTH_40:
	354	rx_status.flag \|= RX_FLAG_40MHZ;
	355	break;
	356	case RATE_MCS_CHAN_WIDTH_80:
	357	rx_status.flag \|= RX_FLAG_80MHZ;
	358	break;
	359	case RATE_MCS_CHAN_WIDTH_160:
	360	rx_status.flag \|= RX_FLAG_160MHZ;
	361	break;
	362	}
	363	if (rate_n_flags & RATE_MCS_SGI_MSK)
	364	rx_status.flag \|= RX_FLAG_SHORT_GI;
	365	if (rate_n_flags & RATE_HT_MCS_GF_MSK)
	366	rx_status.flag \|= RX_FLAG_HT_GF;
	367	if (rate_n_flags & RATE_MCS_HT_MSK) {
	368	rx_status.flag \|= RX_FLAG_HT;
	369	rx_status.rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
	370	} else if (rate_n_flags & RATE_MCS_VHT_MSK) {
	371	rx_status.vht_nss =
	372	((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
	373	RATE_VHT_MCS_NSS_POS) + 1;
	374	rx_status.rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
	375	rx_status.flag \|= RX_FLAG_VHT;
	376	} else {
	377	rx_status.rate_idx =
	378	iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
	379	rx_status.band);
	380	}
	381
	382	iwl_mvm_pass_packet_to_mac80211(mvm, hdr, len, ampdu_status,
	383	rxb, &rx_status);
	384	return 0;
	385	}
9ee718aa	386
3848ab66 MG	387	static void iwl_mvm_update_rx_statistics(struct iwl_mvm *mvm,
	388	struct iwl_notif_statistics *stats)
	389	{
	390	/*
	391	* NOTE FW aggregates the statistics - BUT the statistics are cleared
	392	* when the driver issues REPLY_STATISTICS_CMD 0x9c with CLEAR_STATS
	393	* bit set.
	394	*/
	395	lockdep_assert_held(&mvm->mutex);
	396	memcpy(&mvm->rx_stats, &stats->rx, sizeof(struct mvm_statistics_rx));
	397	}
	398
a20fd398 AO	399	struct iwl_mvm_stat_data {
	400	struct iwl_notif_statistics *stats;
	401	struct iwl_mvm *mvm;
	402	};
	403
	404	static void iwl_mvm_stat_iterator(void _data, u8 mac,
	405	struct ieee80211_vif *vif)
	406	{
	407	struct iwl_mvm_stat_data *data = _data;
	408	struct iwl_notif_statistics *stats = data->stats;
	409	struct iwl_mvm *mvm = data->mvm;
	410	int sig = -stats->general.beacon_filter_average_energy;
	411	int last_event;
	412	int thold = vif->bss_conf.cqm_rssi_thold;
	413	int hyst = vif->bss_conf.cqm_rssi_hyst;
	414	u16 id = le32_to_cpu(stats->rx.general.mac_id);
	415	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	416
	417	if (mvmvif->id != id)
	418	return;
	419
	420	if (vif->type != NL80211_IFTYPE_STATION)
	421	return;
	422
	423	mvmvif->bf_data.ave_beacon_signal = sig;
	424
911222b5 AO	425	/* BT Coex */
	426	if (mvmvif->bf_data.bt_coex_min_thold !=
	427	mvmvif->bf_data.bt_coex_max_thold) {
	428	last_event = mvmvif->bf_data.last_bt_coex_event;
	429	if (sig > mvmvif->bf_data.bt_coex_max_thold &&
	430	(last_event <= mvmvif->bf_data.bt_coex_min_thold \|\|
	431	last_event == 0)) {
	432	mvmvif->bf_data.last_bt_coex_event = sig;
	433	IWL_DEBUG_RX(mvm, "cqm_iterator bt coex high %d\n",
	434	sig);
	435	iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_HIGH);
	436	} else if (sig < mvmvif->bf_data.bt_coex_min_thold &&
	437	(last_event >= mvmvif->bf_data.bt_coex_max_thold \|\|
	438	last_event == 0)) {
	439	mvmvif->bf_data.last_bt_coex_event = sig;
	440	IWL_DEBUG_RX(mvm, "cqm_iterator bt coex low %d\n",
	441	sig);
	442	iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_LOW);
	443	}
	444	}
	445
a20fd398 AO	446	if (!(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
	447	return;
	448
	449	/* CQM Notification */
	450	last_event = mvmvif->bf_data.last_cqm_event;
	451	if (thold && sig < thold && (last_event == 0 \|\|
	452	sig < last_event - hyst)) {
	453	mvmvif->bf_data.last_cqm_event = sig;
	454	IWL_DEBUG_RX(mvm, "cqm_iterator cqm low %d\n",
	455	sig);
	456	ieee80211_cqm_rssi_notify(
	457	vif,
	458	NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
	459	GFP_KERNEL);
	460	} else if (sig > thold &&
	461	(last_event == 0 \|\| sig > last_event + hyst)) {
	462	mvmvif->bf_data.last_cqm_event = sig;
	463	IWL_DEBUG_RX(mvm, "cqm_iterator cqm high %d\n",
	464	sig);
	465	ieee80211_cqm_rssi_notify(
	466	vif,
	467	NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
	468	GFP_KERNEL);
	469	}
	470	}
	471
9ee718aa EL	472	/*
	473	* iwl_mvm_rx_statistics - STATISTICS_NOTIFICATION handler
	474	*
	475	* TODO: This handler is implemented partially.
9ee718aa EL	476	*/
	477	int iwl_mvm_rx_statistics(struct iwl_mvm *mvm,
	478	struct iwl_rx_cmd_buffer *rxb,
	479	struct iwl_device_cmd *cmd)
	480	{
	481	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	482	struct iwl_notif_statistics stats = (void )&pkt->data;
	483	struct mvm_statistics_general_common *common = &stats->general.common;
a20fd398 AO	484	struct iwl_mvm_stat_data data = {
	485	.stats = stats,
	486	.mvm = mvm,
	487	};
9ee718aa EL	488
	489	if (mvm->temperature != le32_to_cpu(common->temperature)) {
	490	mvm->temperature = le32_to_cpu(common->temperature);
	491	iwl_mvm_tt_handler(mvm);
	492	}
3848ab66	493	iwl_mvm_update_rx_statistics(mvm, stats);
9ee718aa	494
a20fd398 AO	495	ieee80211_iterate_active_interfaces(mvm->hw,
	496	IEEE80211_IFACE_ITER_NORMAL,
	497	iwl_mvm_stat_iterator,
	498	&data);
9ee718aa EL	499	return 0;
9ee718aa EL	500	}