iwlwifi: add support for IEEE802.11ax

Add support for the HE in the iwlwifi driver conforming with
P802.11ax_D2.0.

Signed-off-by: Luca Coelho <[email protected]>

Author: lucacoelho

drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c

@@ -463,6 +463,101 @@ static void iwl_init_vht_hw_capab(const struct iwl_cfg *cfg,
 	vht_cap->vht_mcs.tx_mcs_map = vht_cap->vht_mcs.rx_mcs_map;
 }
 
+static struct ieee80211_sband_iftype_data iwl_he_capa = {
+	.types_mask = BIT(NL80211_IFTYPE_STATION) | BIT(NL80211_IFTYPE_AP),
+	.he_cap = {
+		.has_he = true,
+		.he_cap_elem = {
+			.mac_cap_info[0] =
+				IEEE80211_HE_MAC_CAP0_HTC_HE,
+			.mac_cap_info[1] =
+				IEEE80211_HE_MAC_CAP1_TF_MAC_PAD_DUR_16US |
+				IEEE80211_HE_MAC_CAP1_MULTI_TID_AGG_QOS_8,
+			.mac_cap_info[2] =
+				IEEE80211_HE_MAC_CAP2_32BIT_BA_BITMAP |
+				IEEE80211_HE_MAC_CAP2_ACK_EN,
+			.mac_cap_info[3] =
+				IEEE80211_HE_MAC_CAP3_GRP_ADDR_MULTI_STA_BA_DL_MU |
+				IEEE80211_HE_MAC_CAP3_MAX_A_AMPDU_LEN_EXP_VHT_2,
+			.mac_cap_info[4] = IEEE80211_HE_MAC_CAP4_AMDSU_IN_AMPDU,
+			.phy_cap_info[0] =
+				IEEE80211_HE_PHY_CAP0_DUAL_BAND |
+				IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_40MHZ_IN_2G |
+				IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_40MHZ_80MHZ_IN_5G |
+				IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G,
+			.phy_cap_info[1] =
+				IEEE80211_HE_PHY_CAP1_DEVICE_CLASS_A |
+				IEEE80211_HE_PHY_CAP1_LDPC_CODING_IN_PAYLOAD |
+				IEEE80211_HE_PHY_CAP1_MIDAMBLE_RX_MAX_NSTS,
+			.phy_cap_info[2] =
+				IEEE80211_HE_PHY_CAP2_NDP_4x_LTF_AND_3_2US |
+				IEEE80211_HE_PHY_CAP2_STBC_TX_UNDER_80MHZ |
+				IEEE80211_HE_PHY_CAP2_STBC_RX_UNDER_80MHZ,
+			.phy_cap_info[3] =
+				IEEE80211_HE_PHY_CAP3_DCM_MAX_CONST_TX_BPSK |
+				IEEE80211_HE_PHY_CAP3_DCM_MAX_TX_NSS_1 |
+				IEEE80211_HE_PHY_CAP3_DCM_MAX_CONST_RX_BPSK |
+				IEEE80211_HE_PHY_CAP3_DCM_MAX_RX_NSS_1,
+			.phy_cap_info[4] =
+				IEEE80211_HE_PHY_CAP4_SU_BEAMFORMEE |
+				IEEE80211_HE_PHY_CAP4_BEAMFORMEE_MAX_STS_ABOVE_80MHZ_8 |
+				IEEE80211_HE_PHY_CAP4_BEAMFORMEE_MAX_STS_UNDER_80MHZ_8,
+			.phy_cap_info[5] =
+				IEEE80211_HE_PHY_CAP5_BEAMFORMEE_NUM_SND_DIM_UNDER_80MHZ_2 |
+				IEEE80211_HE_PHY_CAP5_BEAMFORMEE_NUM_SND_DIM_ABOVE_80MHZ_2,
+			.phy_cap_info[6] =
+				IEEE80211_HE_PHY_CAP6_PPE_THRESHOLD_PRESENT,
+			.phy_cap_info[7] =
+				IEEE80211_HE_PHY_CAP7_POWER_BOOST_FACTOR_AR |
+				IEEE80211_HE_PHY_CAP7_HE_SU_MU_PPDU_4XLTF_AND_08_US_GI |
+				IEEE80211_HE_PHY_CAP7_MAX_NC_7,
+			.phy_cap_info[8] =
+				IEEE80211_HE_PHY_CAP8_HE_ER_SU_PPDU_4XLTF_AND_08_US_GI |
+				IEEE80211_HE_PHY_CAP8_20MHZ_IN_40MHZ_HE_PPDU_IN_2G |
+				IEEE80211_HE_PHY_CAP8_20MHZ_IN_160MHZ_HE_PPDU |
+				IEEE80211_HE_PHY_CAP8_80MHZ_IN_160MHZ_HE_PPDU,
+		},
+		/*
+		 * Set default Tx/Rx HE MCS NSS Support field. Indicate support
+		 * for up to 2 spatial streams and all MCS, without any special
+		 * cases
+		 */
+		.he_mcs_nss_supp = {
+			.rx_mcs_80 = cpu_to_le16(0xfffa),
+			.tx_mcs_80 = cpu_to_le16(0xfffa),
+			.rx_mcs_160 = cpu_to_le16(0xfffa),
+			.tx_mcs_160 = cpu_to_le16(0xfffa),
+			.rx_mcs_80p80 = cpu_to_le16(0xffff),
+			.tx_mcs_80p80 = cpu_to_le16(0xffff),
+		},
+		/*
+		 * Set default PPE thresholds, with PPET16 set to 0, PPET8 set
+		 * to 7
+		 */
+		.ppe_thres = {0x61, 0x1c, 0xc7, 0x71},
+	},
+};
+
+static void iwl_init_he_hw_capab(struct ieee80211_supported_band *sband,
+				 u8 tx_chains, u8 rx_chains)
+{
+	if (sband->band == NL80211_BAND_2GHZ ||
+	    sband->band == NL80211_BAND_5GHZ)
+		sband->iftype_data = &iwl_he_capa;
+	else
+		return;
+
+	sband->n_iftype_data = 1;
+
+	/* If not 2x2, we need to indicate 1x1 in the Midamble RX Max NSTS */
+	if ((tx_chains & rx_chains) != ANT_AB) {
+		iwl_he_capa.he_cap.he_cap_elem.phy_cap_info[1] &=
+			~IEEE80211_HE_PHY_CAP1_MIDAMBLE_RX_MAX_NSTS;
+		iwl_he_capa.he_cap.he_cap_elem.phy_cap_info[2] &=
+			~IEEE80211_HE_PHY_CAP2_MIDAMBLE_RX_MAX_NSTS;
+	}
+}
+
 static void iwl_init_sbands(struct device *dev, const struct iwl_cfg *cfg,
 			    struct iwl_nvm_data *data,
 			    const __le16 *nvm_ch_flags, u8 tx_chains,
@@ -483,6 +578,9 @@ static void iwl_init_sbands(struct device *dev, const struct iwl_cfg *cfg,
 	iwl_init_ht_hw_capab(cfg, data, &sband->ht_cap, NL80211_BAND_2GHZ,
 			     tx_chains, rx_chains);
 
+	if (data->sku_cap_11ax_enable)
+		iwl_init_he_hw_capab(sband, tx_chains, rx_chains);
+
 	sband = &data->bands[NL80211_BAND_5GHZ];
 	sband->band = NL80211_BAND_5GHZ;
 	sband->bitrates = &iwl_cfg80211_rates[RATES_52_OFFS];
@@ -495,6 +593,9 @@ static void iwl_init_sbands(struct device *dev, const struct iwl_cfg *cfg,
 		iwl_init_vht_hw_capab(cfg, data, &sband->vht_cap,
 				      tx_chains, rx_chains);
 
+	if (data->sku_cap_11ax_enable)
+		iwl_init_he_hw_capab(sband, tx_chains, rx_chains);
+
 	if (n_channels != n_used)
 		IWL_ERR_DEV(dev, "NVM: used only %d of %d channels\n",
 			    n_used, n_channels);
@@ -1293,6 +1394,8 @@ struct iwl_nvm_data *iwl_get_nvm(struct iwl_trans *trans,
 		!!(mac_flags & NVM_MAC_SKU_FLAGS_802_11AC_ENABLED);
 	nvm->sku_cap_11n_enable =
 		!!(mac_flags & NVM_MAC_SKU_FLAGS_802_11N_ENABLED);
+	nvm->sku_cap_11ax_enable =
+		!!(mac_flags & NVM_MAC_SKU_FLAGS_802_11AX_ENABLED);
 	nvm->sku_cap_band_24ghz_enable =
 		!!(mac_flags & NVM_MAC_SKU_FLAGS_BAND_2_4_ENABLED);
 	nvm->sku_cap_band_52ghz_enable =

drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c

@@ -780,6 +780,9 @@ static int iwl_mvm_mac_ctxt_cmd_sta(struct iwl_mvm *mvm,
 	if (vif->probe_req_reg && vif->bss_conf.assoc && vif->p2p)
 		cmd.filter_flags |= cpu_to_le32(MAC_FILTER_IN_PROBE_REQUEST);
 
+	if (vif->bss_conf.assoc && vif->bss_conf.he_support)
+		cmd.filter_flags |= cpu_to_le32(MAC_FILTER_IN_11AX);
+
 	return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);
 }
 

drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c

@@ -36,6 +36,7 @@
  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
+ * Copyright(c) 2018        Intel Corporation
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -914,7 +915,7 @@ static int iwl_mvm_mac_ampdu_action(struct ieee80211_hw *hw,
 	enum ieee80211_ampdu_mlme_action action = params->action;
 	u16 tid = params->tid;
 	u16 *ssn = &params->ssn;
-	u8 buf_size = params->buf_size;
+	u16 buf_size = params->buf_size;
 	bool amsdu = params->amsdu;
 	u16 timeout = params->timeout;
 
@@ -1897,6 +1898,194 @@ void iwl_mvm_mu_mimo_grp_notif(struct iwl_mvm *mvm,
 			iwl_mvm_mu_mimo_iface_iterator, notif);
 }
 
+static u8 iwl_mvm_he_get_ppe_val(u8 *ppe, u8 ppe_pos_bit)
+{
+	u8 byte_num = ppe_pos_bit / 8;
+	u8 bit_num = ppe_pos_bit % 8;
+	u8 residue_bits;
+	u8 res;
+
+	if (bit_num <= 5)
+		return (ppe[byte_num] >> bit_num) &
+		       (BIT(IEEE80211_PPE_THRES_INFO_PPET_SIZE) - 1);
+
+	/*
+	 * If bit_num > 5, we have to combine bits with next byte.
+	 * Calculate how many bits we need to take from current byte (called
+	 * here "residue_bits"), and add them to bits from next byte.
+	 */
+
+	residue_bits = 8 - bit_num;
+
+	res = (ppe[byte_num + 1] &
+	       (BIT(IEEE80211_PPE_THRES_INFO_PPET_SIZE - residue_bits) - 1)) <<
+	      residue_bits;
+	res += (ppe[byte_num] >> bit_num) & (BIT(residue_bits) - 1);
+
+	return res;
+}
+
+static void iwl_mvm_cfg_he_sta(struct iwl_mvm *mvm,
+			       struct ieee80211_vif *vif, u8 sta_id)
+{
+	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
+	struct iwl_he_sta_context_cmd sta_ctxt_cmd = {
+		.sta_id = sta_id,
+		.tid_limit = IWL_MAX_TID_COUNT,
+		.bss_color = vif->bss_conf.bss_color,
+		.htc_trig_based_pkt_ext = vif->bss_conf.htc_trig_based_pkt_ext,
+		.frame_time_rts_th =
+			cpu_to_le16(vif->bss_conf.frame_time_rts_th),
+	};
+	struct ieee80211_sta *sta;
+	u32 flags;
+	int i;
+
+	rcu_read_lock();
+
+	sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_ctxt_cmd.sta_id]);
+	if (IS_ERR(sta)) {
+		rcu_read_unlock();
+		WARN(1, "Can't find STA to configure HE\n");
+		return;
+	}
+
+	if (!sta->he_cap.has_he) {
+		rcu_read_unlock();
+		return;
+	}
+
+	flags = 0;
+
+	/* HTC flags */
+	if (sta->he_cap.he_cap_elem.mac_cap_info[0] &
+	    IEEE80211_HE_MAC_CAP0_HTC_HE)
+		sta_ctxt_cmd.htc_flags |= cpu_to_le32(IWL_HE_HTC_SUPPORT);
+	if ((sta->he_cap.he_cap_elem.mac_cap_info[1] &
+	      IEEE80211_HE_MAC_CAP1_LINK_ADAPTATION) ||
+	    (sta->he_cap.he_cap_elem.mac_cap_info[2] &
+	      IEEE80211_HE_MAC_CAP2_LINK_ADAPTATION)) {
+		u8 link_adap =
+			((sta->he_cap.he_cap_elem.mac_cap_info[2] &
+			  IEEE80211_HE_MAC_CAP2_LINK_ADAPTATION) << 1) +
+			 (sta->he_cap.he_cap_elem.mac_cap_info[1] &
+			  IEEE80211_HE_MAC_CAP1_LINK_ADAPTATION);
+
+		if (link_adap == 2)
+			sta_ctxt_cmd.htc_flags |=
+				cpu_to_le32(IWL_HE_HTC_LINK_ADAP_UNSOLICITED);
+		else if (link_adap == 3)
+			sta_ctxt_cmd.htc_flags |=
+				cpu_to_le32(IWL_HE_HTC_LINK_ADAP_BOTH);
+	}
+	if (sta->he_cap.he_cap_elem.mac_cap_info[2] &
+	    IEEE80211_HE_MAC_CAP2_UL_MU_RESP_SCHED)
+		sta_ctxt_cmd.htc_flags |=
+			cpu_to_le32(IWL_HE_HTC_UL_MU_RESP_SCHED);
+	if (sta->he_cap.he_cap_elem.mac_cap_info[2] & IEEE80211_HE_MAC_CAP2_BSR)
+		sta_ctxt_cmd.htc_flags |= cpu_to_le32(IWL_HE_HTC_BSR_SUPP);
+	if (sta->he_cap.he_cap_elem.mac_cap_info[3] &
+	    IEEE80211_HE_MAC_CAP3_OMI_CONTROL)
+		sta_ctxt_cmd.htc_flags |= cpu_to_le32(IWL_HE_HTC_OMI_SUPP);
+	if (sta->he_cap.he_cap_elem.mac_cap_info[4] & IEEE80211_HE_MAC_CAP4_BQR)
+		sta_ctxt_cmd.htc_flags |= cpu_to_le32(IWL_HE_HTC_BQR_SUPP);
+
+	/* If PPE Thresholds exist, parse them into a FW-familiar format */
+	if (sta->he_cap.he_cap_elem.phy_cap_info[6] &
+	    IEEE80211_HE_PHY_CAP6_PPE_THRESHOLD_PRESENT) {
+		u8 nss = (sta->he_cap.ppe_thres[0] &
+			  IEEE80211_PPE_THRES_NSS_MASK) + 1;
+		u8 ru_index_bitmap =
+			(sta->he_cap.ppe_thres[0] &
+			 IEEE80211_PPE_THRES_RU_INDEX_BITMASK_MASK) >>
+			IEEE80211_PPE_THRES_RU_INDEX_BITMASK_POS;
+		u8 *ppe = &sta->he_cap.ppe_thres[0];
+		u8 ppe_pos_bit = 7; /* Starting after PPE header */
+
+		/*
+		 * FW currently supports only nss == MAX_HE_SUPP_NSS
+		 *
+		 * If nss > MAX: we can ignore values we don't support
+		 * If nss < MAX: we can set zeros in other streams
+		 */
+		if (nss > MAX_HE_SUPP_NSS) {
+			IWL_INFO(mvm, "Got NSS = %d - trimming to %d\n", nss,
+				 MAX_HE_SUPP_NSS);
+			nss = MAX_HE_SUPP_NSS;
+		}
+
+		for (i = 0; i < nss; i++) {
+			u8 ru_index_tmp = ru_index_bitmap << 1;
+			u8 bw;
+
+			for (bw = 0; bw < MAX_HE_CHANNEL_BW_INDX; bw++) {
+				ru_index_tmp >>= 1;
+				if (!(ru_index_tmp & 1))
+					continue;
+
+				sta_ctxt_cmd.pkt_ext.pkt_ext_qam_th[i][bw][1] =
+					iwl_mvm_he_get_ppe_val(ppe,
+							       ppe_pos_bit);
+				ppe_pos_bit +=
+					IEEE80211_PPE_THRES_INFO_PPET_SIZE;
+				sta_ctxt_cmd.pkt_ext.pkt_ext_qam_th[i][bw][0] =
+					iwl_mvm_he_get_ppe_val(ppe,
+							       ppe_pos_bit);
+				ppe_pos_bit +=
+					IEEE80211_PPE_THRES_INFO_PPET_SIZE;
+			}
+		}
+
+		flags |= STA_CTXT_HE_PACKET_EXT;
+	}
+	rcu_read_unlock();
+
+	/* Mark MU EDCA as enabled, unless none detected on some AC */
+	flags |= STA_CTXT_HE_MU_EDCA_CW;
+	for (i = 0; i < AC_NUM; i++) {
+		struct ieee80211_he_mu_edca_param_ac_rec *mu_edca =
+			&mvmvif->queue_params[i].mu_edca_param_rec;
+
+		if (!mvmvif->queue_params[i].mu_edca) {
+			flags &= ~STA_CTXT_HE_MU_EDCA_CW;
+			break;
+		}
+
+		sta_ctxt_cmd.trig_based_txf[i].cwmin =
+			cpu_to_le16(mu_edca->ecw_min_max & 0xf);
+		sta_ctxt_cmd.trig_based_txf[i].cwmax =
+			cpu_to_le16((mu_edca->ecw_min_max & 0xf0) >> 4);
+		sta_ctxt_cmd.trig_based_txf[i].aifsn =
+			cpu_to_le16(mu_edca->aifsn);
+		sta_ctxt_cmd.trig_based_txf[i].mu_time =
+			cpu_to_le16(mu_edca->mu_edca_timer);
+	}
+
+	if (vif->bss_conf.multi_sta_back_32bit)
+		flags |= STA_CTXT_HE_32BIT_BA_BITMAP;
+
+	if (vif->bss_conf.ack_enabled)
+		flags |= STA_CTXT_HE_ACK_ENABLED;
+
+	if (vif->bss_conf.uora_exists) {
+		flags |= STA_CTXT_HE_TRIG_RND_ALLOC;
+
+		sta_ctxt_cmd.rand_alloc_ecwmin =
+			vif->bss_conf.uora_ocw_range & 0x7;
+		sta_ctxt_cmd.rand_alloc_ecwmax =
+			(vif->bss_conf.uora_ocw_range >> 3) & 0x7;
+	}
+
+	/* TODO: support Multi BSSID IE */
+
+	sta_ctxt_cmd.flags = cpu_to_le32(flags);
+
+	if (iwl_mvm_send_cmd_pdu(mvm, iwl_cmd_id(STA_HE_CTXT_CMD,
+						 DATA_PATH_GROUP, 0),
+				 0, sizeof(sta_ctxt_cmd), &sta_ctxt_cmd))
+		IWL_ERR(mvm, "Failed to config FW to work HE!\n");
+}
+
 static void iwl_mvm_bss_info_changed_station(struct iwl_mvm *mvm,
 					     struct ieee80211_vif *vif,
 					     struct ieee80211_bss_conf *bss_conf,
@@ -1910,8 +2099,12 @@ static void iwl_mvm_bss_info_changed_station(struct iwl_mvm *mvm,
 	 * beacon interval, which was not known when the station interface was
 	 * added.
 	 */
-	if (changes & BSS_CHANGED_ASSOC && bss_conf->assoc)
+	if (changes & BSS_CHANGED_ASSOC && bss_conf->assoc) {
+		if (vif->bss_conf.he_support)
+			iwl_mvm_cfg_he_sta(mvm, vif, mvmvif->ap_sta_id);
+
 		iwl_mvm_mac_ctxt_recalc_tsf_id(mvm, vif);
+	}
 
 	/*
 	 * If we're not associated yet, take the (new) BSSID before associating

drivers/net/wireless/intel/iwlwifi/mvm/mvm.h

@@ -654,7 +654,7 @@ struct iwl_mvm_tcm {
 struct iwl_mvm_reorder_buffer {
 	u16 head_sn;
 	u16 num_stored;
-	u8 buf_size;
+	u16 buf_size;
 	int queue;
 	u16 last_amsdu;
 	u8 last_sub_index;

drivers/net/wireless/intel/iwlwifi/mvm/ops.c

@@ -448,6 +448,7 @@ static const struct iwl_hcmd_names iwl_mvm_data_path_names[] = {
 	HCMD_NAME(DQA_ENABLE_CMD),
 	HCMD_NAME(UPDATE_MU_GROUPS_CMD),
 	HCMD_NAME(TRIGGER_RX_QUEUES_NOTIF_CMD),
+	HCMD_NAME(STA_HE_CTXT_CMD),
 	HCMD_NAME(STA_PM_NOTIF),
 	HCMD_NAME(MU_GROUP_MGMT_NOTIF),
 	HCMD_NAME(RX_QUEUES_NOTIFICATION),