[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 - 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;
}
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	*
51368bf7	8	* Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
8ca151b5 JB	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	*
51368bf7	33	* Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
8ca151b5 JB	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"
8ca151b5 JB	63	#include "mvm.h"
	64	#include "fw-api.h"
	65
	66	/*
	67	* iwl_mvm_rx_rx_phy_cmd - REPLY_RX_PHY_CMD handler
	68	*
	69	* Copies the phy information in mvm->last_phy_info, it will be used when the
	70	* actual data will come from the fw in the next packet.
	71	*/
	72	int iwl_mvm_rx_rx_phy_cmd(struct iwl_mvm mvm, struct iwl_rx_cmd_buffer rxb,
	73	struct iwl_device_cmd *cmd)
	74	{
	75	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	76
	77	memcpy(&mvm->last_phy_info, pkt->data, sizeof(mvm->last_phy_info));
	78	mvm->ampdu_ref++;
5fc0f76c ES	79
	80	#ifdef CONFIG_IWLWIFI_DEBUGFS
	81	if (mvm->last_phy_info.phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
	82	spin_lock(&mvm->drv_stats_lock);
	83	mvm->drv_rx_stats.ampdu_count++;
	84	spin_unlock(&mvm->drv_stats_lock);
	85	}
	86	#endif
	87
8ca151b5 JB	88	return 0;
	89	}
	90
	91	/*
	92	* iwl_mvm_pass_packet_to_mac80211 - builds the packet for mac80211
	93	*
	94	* Adds the rxb to a new skb and give it to mac80211
	95	*/
	96	static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
	97	struct ieee80211_hdr *hdr, u16 len,
	98	u32 ampdu_status,
	99	struct iwl_rx_cmd_buffer *rxb,
	100	struct ieee80211_rx_status *stats)
	101	{
	102	struct sk_buff *skb;
	103	unsigned int hdrlen, fraglen;
	104
	105	/* Dont use dev_alloc_skb(), we'll have enough headroom once
	106	* ieee80211_hdr pulled.
	107	*/
	108	skb = alloc_skb(128, GFP_ATOMIC);
	109	if (!skb) {
	110	IWL_ERR(mvm, "alloc_skb failed\n");
	111	return;
	112	}
	113	/* If frame is small enough to fit in skb->head, pull it completely.
	114	* If not, only pull ieee80211_hdr so that splice() or TCP coalesce
	115	* are more efficient.
	116	*/
	117	hdrlen = (len <= skb_tailroom(skb)) ? len : sizeof(*hdr);
	118
	119	memcpy(skb_put(skb, hdrlen), hdr, hdrlen);
	120	fraglen = len - hdrlen;
	121
	122	if (fraglen) {
	123	int offset = (void *)hdr + hdrlen -
	124	rxb_addr(rxb) + rxb_offset(rxb);
	125
	126	skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset,
	127	fraglen, rxb->truesize);
	128	}
	129
	130	memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
	131
f14d6b39	132	ieee80211_rx(mvm->hw, skb);
8ca151b5 JB	133	}
8ca151b5 JB	134
a2d7b870 AA	135	/*
a2d7b870 AA	136	* iwl_mvm_get_signal_strength - use new rx PHY INFO API
17dbe564 AA	137	* values are reported by the fw as positive values - need to negate
	138	* to obtain their dBM. Account for missing antennas by replacing 0
	139	* values by -256dBm: practically 0 power and a non-feasible 8 bit value.
a2d7b870	140	*/
226eb8cd JB	141	static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
	142	struct iwl_rx_phy_info *phy_info,
	143	struct ieee80211_rx_status *rx_status)
a2d7b870 AA	144	{
	145	int energy_a, energy_b, energy_c, max_energy;
	146	u32 val;
	147
	148	val =
	149	le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
17dbe564 AA	150	energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
	151	IWL_RX_INFO_ENERGY_ANT_A_POS;
	152	energy_a = energy_a ? -energy_a : -256;
	153	energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
	154	IWL_RX_INFO_ENERGY_ANT_B_POS;
	155	energy_b = energy_b ? -energy_b : -256;
	156	energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
	157	IWL_RX_INFO_ENERGY_ANT_C_POS;
	158	energy_c = energy_c ? -energy_c : -256;
a2d7b870 AA	159	max_energy = max(energy_a, energy_b);
	160	max_energy = max(max_energy, energy_c);
	161
	162	IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
	163	energy_a, energy_b, energy_c, max_energy);
	164
226eb8cd JB	165	rx_status->signal = max_energy;
	166	rx_status->chains = (le16_to_cpu(phy_info->phy_flags) &
	167	RX_RES_PHY_FLAGS_ANTENNA)
	168	>> RX_RES_PHY_FLAGS_ANTENNA_POS;
	169	rx_status->chain_signal[0] = energy_a;
	170	rx_status->chain_signal[1] = energy_b;
	171	rx_status->chain_signal[2] = energy_c;
a2d7b870 AA	172	}
a2d7b870 AA	173
8ca151b5 JB	174	/*
	175	* iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
	176	* @mvm: the mvm object
	177	* @hdr: 80211 header
	178	* @stats: status in mac80211's format
	179	* @rx_pkt_status: status coming from fw
	180	*
	181	* returns non 0 value if the packet should be dropped
	182	*/
	183	static u32 iwl_mvm_set_mac80211_rx_flag(struct iwl_mvm *mvm,
	184	struct ieee80211_hdr *hdr,
	185	struct ieee80211_rx_status *stats,
	186	u32 rx_pkt_status)
	187	{
	188	if (!ieee80211_has_protected(hdr->frame_control) \|\|
	189	(rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
	190	RX_MPDU_RES_STATUS_SEC_NO_ENC)
	191	return 0;
	192
	193	/* packet was encrypted with unknown alg */
	194	if ((rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) ==
	195	RX_MPDU_RES_STATUS_SEC_ENC_ERR)
	196	return 0;
	197
	198	switch (rx_pkt_status & RX_MPDU_RES_STATUS_SEC_ENC_MSK) {
	199	case RX_MPDU_RES_STATUS_SEC_CCM_ENC:
	200	/* alg is CCM: check MIC only */
	201	if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
	202	return -1;
	203
	204	stats->flag \|= RX_FLAG_DECRYPTED;
	205	IWL_DEBUG_WEP(mvm, "hw decrypted CCMP successfully\n");
	206	return 0;
	207
	208	case RX_MPDU_RES_STATUS_SEC_TKIP_ENC:
	209	/* Don't drop the frame and decrypt it in SW */
	210	if (!(rx_pkt_status & RX_MPDU_RES_STATUS_TTAK_OK))
	211	return 0;
	212	/* fall through if TTAK OK */
	213
	214	case RX_MPDU_RES_STATUS_SEC_WEP_ENC:
	215	if (!(rx_pkt_status & RX_MPDU_RES_STATUS_ICV_OK))
	216	return -1;
	217
	218	stats->flag \|= RX_FLAG_DECRYPTED;
	219	return 0;
	220
e36e5433 MS	221	case RX_MPDU_RES_STATUS_SEC_EXT_ENC:
	222	if (!(rx_pkt_status & RX_MPDU_RES_STATUS_MIC_OK))
	223	return -1;
	224	stats->flag \|= RX_FLAG_DECRYPTED;
	225	return 0;
	226
8ca151b5 JB	227	default:
	228	IWL_ERR(mvm, "Unhandled alg: 0x%x\n", rx_pkt_status);
	229	}
	230
	231	return 0;
	232	}
	233
	234	/*
	235	* iwl_mvm_rx_rx_mpdu - REPLY_RX_MPDU_CMD handler
	236	*
	237	* Handles the actual data of the Rx packet from the fw
	238	*/
	239	int iwl_mvm_rx_rx_mpdu(struct iwl_mvm mvm, struct iwl_rx_cmd_buffer rxb,
	240	struct iwl_device_cmd *cmd)
	241	{
	242	struct ieee80211_hdr *hdr;
	243	struct ieee80211_rx_status rx_status = {};
	244	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	245	struct iwl_rx_phy_info *phy_info;
	246	struct iwl_rx_mpdu_res_start *rx_res;
	247	u32 len;
	248	u32 ampdu_status;
	249	u32 rate_n_flags;
	250	u32 rx_pkt_status;
	251
	252	phy_info = &mvm->last_phy_info;
	253	rx_res = (struct iwl_rx_mpdu_res_start *)pkt->data;
	254	hdr = (struct ieee80211_hdr )(pkt->data + sizeof(rx_res));
	255	len = le16_to_cpu(rx_res->byte_count);
	256	rx_pkt_status = le32_to_cpup((__le32 *)
	257	(pkt->data + sizeof(*rx_res) + len));
	258
	259	memset(&rx_status, 0, sizeof(rx_status));
	260
	261	/*
	262	* drop the packet if it has failed being decrypted by HW
	263	*/
	264	if (iwl_mvm_set_mac80211_rx_flag(mvm, hdr, &rx_status, rx_pkt_status)) {
	265	IWL_DEBUG_DROP(mvm, "Bad decryption results 0x%08x\n",
	266	rx_pkt_status);
	267	return 0;
	268	}
	269
	270	if ((unlikely(phy_info->cfg_phy_cnt > 20))) {
	271	IWL_DEBUG_DROP(mvm, "dsp size out of range [0,20]: %d\n",
	272	phy_info->cfg_phy_cnt);
	273	return 0;
	274	}
	275
fb8b8ee1 JB	276	/*
	277	* Keep packets with CRC errors (and with overrun) for monitor mode
	278	* (otherwise the firmware discards them) but mark them as bad.
	279	*/
8ca151b5 JB	280	if (!(rx_pkt_status & RX_MPDU_RES_STATUS_CRC_OK) \|\|
	281	!(rx_pkt_status & RX_MPDU_RES_STATUS_OVERRUN_OK)) {
	282	IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", rx_pkt_status);
fb8b8ee1	283	rx_status.flag \|= RX_FLAG_FAILED_FCS_CRC;
8ca151b5 JB	284	}
	285
	286	/* This will be used in several places later */
	287	rate_n_flags = le32_to_cpu(phy_info->rate_n_flags);
	288
	289	/* rx_status carries information about the packet to mac80211 */
	290	rx_status.mactime = le64_to_cpu(phy_info->timestamp);
d2931bbd	291	rx_status.device_timestamp = le32_to_cpu(phy_info->system_timestamp);
8ca151b5 JB	292	rx_status.band =
	293	(phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_BAND_24)) ?
	294	IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
	295	rx_status.freq =
	296	ieee80211_channel_to_frequency(le16_to_cpu(phy_info->channel),
	297	rx_status.band);
	298	/*
	299	* TSF as indicated by the fw is at INA time, but mac80211 expects the
	300	* TSF at the beginning of the MPDU.
	301	*/
	302	/rx_status.flag \|= RX_FLAG_MACTIME_MPDU;/
	303
3fe47dca	304	iwl_mvm_get_signal_strength(mvm, phy_info, &rx_status);
8ca151b5 JB	305
	306	IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status.signal,
	307	(unsigned long long)rx_status.mactime);
	308
8ca151b5 JB	309	/* set the preamble flag if appropriate */
	310	if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
	311	rx_status.flag \|= RX_FLAG_SHORTPRE;
	312
	313	if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_AGG)) {
	314	/*
	315	* We know which subframes of an A-MPDU belong
	316	* together since we get a single PHY response
	317	* from the firmware for all of them
	318	*/
	319	rx_status.flag \|= RX_FLAG_AMPDU_DETAILS;
	320	rx_status.ampdu_reference = mvm->ampdu_ref;
	321	}
	322
	323	/* Set up the HT phy flags */
	324	switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
	325	case RATE_MCS_CHAN_WIDTH_20:
	326	break;
	327	case RATE_MCS_CHAN_WIDTH_40:
	328	rx_status.flag \|= RX_FLAG_40MHZ;
	329	break;
	330	case RATE_MCS_CHAN_WIDTH_80:
1b8d242a	331	rx_status.vht_flag \|= RX_VHT_FLAG_80MHZ;
8ca151b5 JB	332	break;
8ca151b5 JB	333	case RATE_MCS_CHAN_WIDTH_160:
1b8d242a	334	rx_status.vht_flag \|= RX_VHT_FLAG_160MHZ;
8ca151b5 JB	335	break;
	336	}
	337	if (rate_n_flags & RATE_MCS_SGI_MSK)
	338	rx_status.flag \|= RX_FLAG_SHORT_GI;
	339	if (rate_n_flags & RATE_HT_MCS_GF_MSK)
	340	rx_status.flag \|= RX_FLAG_HT_GF;
7b1dd048 EG	341	if (rate_n_flags & RATE_MCS_LDPC_MSK)
7b1dd048 EG	342	rx_status.flag \|= RX_FLAG_LDPC;
8ca151b5	343	if (rate_n_flags & RATE_MCS_HT_MSK) {
7b1dd048 EG	344	u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >>
7b1dd048 EG	345	RATE_MCS_STBC_POS;
8ca151b5 JB	346	rx_status.flag \|= RX_FLAG_HT;
8ca151b5 JB	347	rx_status.rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
7b1dd048	348	rx_status.flag \|= stbc << RX_FLAG_STBC_SHIFT;
8ca151b5	349	} else if (rate_n_flags & RATE_MCS_VHT_MSK) {
7b1dd048 EG	350	u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >>
7b1dd048 EG	351	RATE_MCS_STBC_POS;
8ca151b5 JB	352	rx_status.vht_nss =
	353	((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
	354	RATE_VHT_MCS_NSS_POS) + 1;
	355	rx_status.rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
	356	rx_status.flag \|= RX_FLAG_VHT;
7b1dd048	357	rx_status.flag \|= stbc << RX_FLAG_STBC_SHIFT;
95e05ab7 EG	358	if (rate_n_flags & RATE_MCS_BF_MSK)
95e05ab7 EG	359	rx_status.vht_flag \|= RX_VHT_FLAG_BF;
8ca151b5 JB	360	} else {
	361	rx_status.rate_idx =
	362	iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
	363	rx_status.band);
	364	}
	365
5fc0f76c ES	366	#ifdef CONFIG_IWLWIFI_DEBUGFS
	367	iwl_mvm_update_frame_stats(mvm, &mvm->drv_rx_stats, rate_n_flags,
	368	rx_status.flag & RX_FLAG_AMPDU_DETAILS);
	369	#endif
8ca151b5 JB	370	iwl_mvm_pass_packet_to_mac80211(mvm, hdr, len, ampdu_status,
	371	rxb, &rx_status);
	372	return 0;
	373	}
9ee718aa	374
3848ab66 MG	375	static void iwl_mvm_update_rx_statistics(struct iwl_mvm *mvm,
	376	struct iwl_notif_statistics *stats)
	377	{
	378	/*
	379	* NOTE FW aggregates the statistics - BUT the statistics are cleared
	380	* when the driver issues REPLY_STATISTICS_CMD 0x9c with CLEAR_STATS
	381	* bit set.
	382	*/
	383	lockdep_assert_held(&mvm->mutex);
	384	memcpy(&mvm->rx_stats, &stats->rx, sizeof(struct mvm_statistics_rx));
	385	}
	386
a20fd398 AO	387	struct iwl_mvm_stat_data {
	388	struct iwl_notif_statistics *stats;
	389	struct iwl_mvm *mvm;
	390	};
	391
	392	static void iwl_mvm_stat_iterator(void _data, u8 mac,
	393	struct ieee80211_vif *vif)
	394	{
	395	struct iwl_mvm_stat_data *data = _data;
	396	struct iwl_notif_statistics *stats = data->stats;
	397	struct iwl_mvm *mvm = data->mvm;
	398	int sig = -stats->general.beacon_filter_average_energy;
	399	int last_event;
	400	int thold = vif->bss_conf.cqm_rssi_thold;
	401	int hyst = vif->bss_conf.cqm_rssi_hyst;
	402	u16 id = le32_to_cpu(stats->rx.general.mac_id);
	403	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	404
	405	if (mvmvif->id != id)
	406	return;
	407
	408	if (vif->type != NL80211_IFTYPE_STATION)
	409	return;
	410
	411	mvmvif->bf_data.ave_beacon_signal = sig;
	412
911222b5 AO	413	/* BT Coex */
	414	if (mvmvif->bf_data.bt_coex_min_thold !=
	415	mvmvif->bf_data.bt_coex_max_thold) {
	416	last_event = mvmvif->bf_data.last_bt_coex_event;
	417	if (sig > mvmvif->bf_data.bt_coex_max_thold &&
	418	(last_event <= mvmvif->bf_data.bt_coex_min_thold \|\|
	419	last_event == 0)) {
	420	mvmvif->bf_data.last_bt_coex_event = sig;
	421	IWL_DEBUG_RX(mvm, "cqm_iterator bt coex high %d\n",
	422	sig);
	423	iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_HIGH);
	424	} else if (sig < mvmvif->bf_data.bt_coex_min_thold &&
	425	(last_event >= mvmvif->bf_data.bt_coex_max_thold \|\|
	426	last_event == 0)) {
	427	mvmvif->bf_data.last_bt_coex_event = sig;
	428	IWL_DEBUG_RX(mvm, "cqm_iterator bt coex low %d\n",
	429	sig);
	430	iwl_mvm_bt_rssi_event(mvm, vif, RSSI_EVENT_LOW);
	431	}
	432	}
	433
a20fd398 AO	434	if (!(vif->driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI))
	435	return;
	436
	437	/* CQM Notification */
	438	last_event = mvmvif->bf_data.last_cqm_event;
	439	if (thold && sig < thold && (last_event == 0 \|\|
	440	sig < last_event - hyst)) {
	441	mvmvif->bf_data.last_cqm_event = sig;
	442	IWL_DEBUG_RX(mvm, "cqm_iterator cqm low %d\n",
	443	sig);
	444	ieee80211_cqm_rssi_notify(
	445	vif,
	446	NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
	447	GFP_KERNEL);
	448	} else if (sig > thold &&
	449	(last_event == 0 \|\| sig > last_event + hyst)) {
	450	mvmvif->bf_data.last_cqm_event = sig;
	451	IWL_DEBUG_RX(mvm, "cqm_iterator cqm high %d\n",
	452	sig);
	453	ieee80211_cqm_rssi_notify(
	454	vif,
	455	NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
	456	GFP_KERNEL);
	457	}
	458	}
	459
9ee718aa EL	460	/*
	461	* iwl_mvm_rx_statistics - STATISTICS_NOTIFICATION handler
	462	*
	463	* TODO: This handler is implemented partially.
9ee718aa EL	464	*/
	465	int iwl_mvm_rx_statistics(struct iwl_mvm *mvm,
	466	struct iwl_rx_cmd_buffer *rxb,
	467	struct iwl_device_cmd *cmd)
	468	{
	469	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	470	struct iwl_notif_statistics stats = (void )&pkt->data;
	471	struct mvm_statistics_general_common *common = &stats->general.common;
a20fd398 AO	472	struct iwl_mvm_stat_data data = {
	473	.stats = stats,
	474	.mvm = mvm,
	475	};
9ee718aa EL	476
	477	if (mvm->temperature != le32_to_cpu(common->temperature)) {
	478	mvm->temperature = le32_to_cpu(common->temperature);
	479	iwl_mvm_tt_handler(mvm);
	480	}
3848ab66	481	iwl_mvm_update_rx_statistics(mvm, stats);
9ee718aa	482
a20fd398 AO	483	ieee80211_iterate_active_interfaces(mvm->hw,
	484	IEEE80211_IFACE_ITER_NORMAL,
	485	iwl_mvm_stat_iterator,
	486	&data);
9ee718aa EL	487	return 0;
9ee718aa EL	488	}