iwlwifi: mvm: add support for 6GHz

Add support to the 6GHz band (aka. Ultra High Band or UHB).  This
allows us to scan and connect to channels in that band, including all
the relevant features, such as preferred scan channels, colocated
channels etc.

Co-developed-by: Haim Dreyfuss <haim.dreyfuss@intel.com>
Signed-off-by: Haim Dreyfuss <haim.dreyfuss@intel.com>
Co-developed-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Co-developed-by: Tova Mussai <tova.mussai@intel.com>
Signed-off-by: Tova Mussai <tova.mussai@intel.com>
Co-developed-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Co-developed-by: Tali Levi Rovinsky <Tali.Levi-rovinsky@intel.com>
Signed-off-by: Tali Levi Rovinsky <Tali.Levi-rovinsky@intel.com>
Co-developed-by: Avraham Stern <avraham.stern@intel.com>
Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Co-developed-by: Ayala Beker <ayala.beker@intel.com>
Signed-off-by: Ayala Beker <ayala.beker@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20201210000657.0fdbfc3d7352.Idb648536faf21716e2ab2c6d6890d3e49f719cd3@changeid
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

Author: lucacoelho

drivers/net/wireless/intel/iwlwifi/cfg/22000.c

@@ -155,7 +155,8 @@ static const struct iwl_base_params iwl_ax210_base_params = {
 static const struct iwl_ht_params iwl_22000_ht_params = {
 	.stbc = true,
 	.ldpc = true,
-	.ht40_bands = BIT(NL80211_BAND_2GHZ) | BIT(NL80211_BAND_5GHZ),
+	.ht40_bands = BIT(NL80211_BAND_2GHZ) | BIT(NL80211_BAND_5GHZ) |
+		      BIT(NL80211_BAND_6GHZ),
 };
 
 #define IWL_DEVICE_22000_COMMON						\

drivers/net/wireless/intel/iwlwifi/fw/api/phy-ctxt.h

@@ -66,6 +66,7 @@
 /* Supported bands */
 #define PHY_BAND_5  (0)
 #define PHY_BAND_24 (1)
+#define PHY_BAND_6 (2)
 
 /* Supported channel width, vary if there is VHT support */
 #define PHY_VHT_CHANNEL_MODE20	(0x0)

drivers/net/wireless/intel/iwlwifi/fw/api/scan.h

@@ -530,6 +530,11 @@ enum iwl_channel_flags {
 	IWL_CHANNEL_FLAG_PRE_SCAN_PASSIVE2ACTIVE	= BIT(3),
 };
 
+enum iwl_uhb_chan_cfg_flags {
+	IWL_UHB_CHAN_CFG_FLAG_UNSOLICITED_PROBE_RES = BIT(24),
+	IWL_UHB_CHAN_CFG_FLAG_PSC_CHAN_NO_LISTEN    = BIT(25),
+	IWL_UHB_CHAN_CFG_FLAG_FORCE_PASSIVE         = BIT(26),
+};
 /**
  * struct iwl_scan_dwell
  * @active:		default dwell time for active scan

drivers/net/wireless/intel/iwlwifi/fw/file.h

@@ -486,6 +486,11 @@ enum iwl_ucode_tlv_capa {
 	/* set 3 */
 	IWL_UCODE_TLV_CAPA_MLME_OFFLOAD			= (__force iwl_ucode_tlv_capa_t)96,
 
+	/*
+	 * @IWL_UCODE_TLV_CAPA_PSC_CHAN_SUPPORT: supports PSC channels
+	 */
+	IWL_UCODE_TLV_CAPA_PSC_CHAN_SUPPORT		= (__force iwl_ucode_tlv_capa_t)98,
+
 	NUM_IWL_UCODE_TLV_CAPA
 #ifdef __CHECKER__
 		/* sparse says it cannot increment the previous enum member */

drivers/net/wireless/intel/iwlwifi/iwl-eeprom-parse.h

@@ -100,6 +100,11 @@ struct iwl_nvm_data {
 	bool vht160_supported;
 	struct ieee80211_supported_band bands[NUM_NL80211_BANDS];
 
+	/*
+	 * iftype data for low (2.4 GHz) and high (5 and 6 GHz) bands,
+	 * we can use the same for 5 and 6 GHz bands because they have
+	 * the same data
+	 */
 	struct {
 		struct ieee80211_sband_iftype_data low[2];
 		struct ieee80211_sband_iftype_data high[2];

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

@@ -166,6 +166,7 @@ static const u16 iwl_uhb_nvm_channels[] = {
 #define IWL_NVM_NUM_CHANNELS_EXT	ARRAY_SIZE(iwl_ext_nvm_channels)
 #define IWL_NVM_NUM_CHANNELS_UHB	ARRAY_SIZE(iwl_uhb_nvm_channels)
 #define NUM_2GHZ_CHANNELS		14
+#define NUM_5GHZ_CHANNELS		37
 #define FIRST_2GHZ_HT_MINUS		5
 #define LAST_2GHZ_HT_PLUS		9
 #define N_HW_ADDR_MASK			0xF
@@ -389,6 +390,10 @@ static u32 iwl_get_channel_flags(u8 ch_num, int ch_idx, enum nl80211_band band,
 
 static enum nl80211_band iwl_nl80211_band_from_channel_idx(int ch_idx)
 {
+	if (ch_idx >= NUM_2GHZ_CHANNELS + NUM_5GHZ_CHANNELS) {
+		return NL80211_BAND_6GHZ;
+	}
+
 	if (ch_idx >= NUM_2GHZ_CHANNELS)
 		return NL80211_BAND_5GHZ;
 	return NL80211_BAND_2GHZ;
@@ -480,6 +485,11 @@ static int iwl_init_channel_map(struct device *dev, const struct iwl_cfg *cfg,
 		else
 			channel->flags = 0;
 
+		/* TODO: Don't put limitations on UHB devices as we still don't
+		 * have NVM for them
+		 */
+		if (cfg->uhb_supported)
+			channel->flags = 0;
 		iwl_nvm_print_channel_flags(dev, IWL_DL_EEPROM,
 					    channel->hw_value, ch_flags);
 		IWL_DEBUG_EEPROM(dev, "Ch. %d: %ddBm\n",
@@ -743,6 +753,52 @@ static const struct ieee80211_sband_iftype_data iwl_he_capa[] = {
 	},
 };
 
+static void iwl_init_he_6ghz_capa(struct iwl_trans *trans,
+				  struct iwl_nvm_data *data,
+				  struct ieee80211_supported_band *sband,
+				  u8 tx_chains, u8 rx_chains)
+{
+	struct ieee80211_sta_ht_cap ht_cap;
+	struct ieee80211_sta_vht_cap vht_cap = {};
+	struct ieee80211_sband_iftype_data *iftype_data;
+	u16 he_6ghz_capa = 0;
+	u32 exp;
+	int i;
+
+	if (sband->band != NL80211_BAND_6GHZ)
+		return;
+
+	/* grab HT/VHT capabilities and calculate HE 6 GHz capabilities */
+	iwl_init_ht_hw_capab(trans, data, &ht_cap, NL80211_BAND_5GHZ,
+			     tx_chains, rx_chains);
+	WARN_ON(!ht_cap.ht_supported);
+	iwl_init_vht_hw_capab(trans, data, &vht_cap, tx_chains, rx_chains);
+	WARN_ON(!vht_cap.vht_supported);
+
+	he_6ghz_capa |=
+		u16_encode_bits(ht_cap.ampdu_density,
+				IEEE80211_HE_6GHZ_CAP_MIN_MPDU_START);
+	exp = u32_get_bits(vht_cap.cap,
+			   IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK);
+	he_6ghz_capa |=
+		u16_encode_bits(exp, IEEE80211_HE_6GHZ_CAP_MAX_AMPDU_LEN_EXP);
+	exp = u32_get_bits(vht_cap.cap, IEEE80211_VHT_CAP_MAX_MPDU_MASK);
+	he_6ghz_capa |=
+		u16_encode_bits(exp, IEEE80211_HE_6GHZ_CAP_MAX_MPDU_LEN);
+	/* we don't support extended_ht_cap_info anywhere, so no RD_RESPONDER */
+	if (vht_cap.cap & IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN)
+		he_6ghz_capa |= IEEE80211_HE_6GHZ_CAP_TX_ANTPAT_CONS;
+	if (vht_cap.cap & IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN)
+		he_6ghz_capa |= IEEE80211_HE_6GHZ_CAP_RX_ANTPAT_CONS;
+
+	IWL_DEBUG_EEPROM(trans->dev, "he_6ghz_capa=0x%x\n", he_6ghz_capa);
+
+	/* we know it's writable - we set it before ourselves */
+	iftype_data = (void *)sband->iftype_data;
+	for (i = 0; i < sband->n_iftype_data; i++)
+		iftype_data[i].he_6ghz_capa.capa = cpu_to_le16(he_6ghz_capa);
+}
+
 static void iwl_init_he_hw_capab(struct iwl_trans *trans,
 				 struct iwl_nvm_data *data,
 				 struct ieee80211_supported_band *sband,
@@ -762,6 +818,7 @@ static void iwl_init_he_hw_capab(struct iwl_trans *trans,
 		iftype_data = data->iftd.low;
 		break;
 	case NL80211_BAND_5GHZ:
+	case NL80211_BAND_6GHZ:
 		iftype_data = data->iftd.high;
 		break;
 	default:
@@ -787,6 +844,7 @@ static void iwl_init_he_hw_capab(struct iwl_trans *trans,
 				~IEEE80211_HE_PHY_CAP7_MAX_NC_MASK;
 		}
 	}
+	iwl_init_he_6ghz_capa(trans, data, sband, tx_chains, rx_chains);
 }
 
 static void iwl_init_sbands(struct iwl_trans *trans,
@@ -829,6 +887,19 @@ static void iwl_init_sbands(struct iwl_trans *trans,
 	if (data->sku_cap_11ax_enable && !iwlwifi_mod_params.disable_11ax)
 		iwl_init_he_hw_capab(trans, data, sband, tx_chains, rx_chains);
 
+	/* 6GHz band. */
+	sband = &data->bands[NL80211_BAND_6GHZ];
+	sband->band = NL80211_BAND_6GHZ;
+	/* use the same rates as 5GHz band */
+	sband->bitrates = &iwl_cfg80211_rates[RATES_52_OFFS];
+	sband->n_bitrates = N_RATES_52;
+	n_used += iwl_init_sband_channels(data, sband, n_channels,
+					  NL80211_BAND_6GHZ);
+
+	if (data->sku_cap_11ax_enable && !iwlwifi_mod_params.disable_11ax)
+		iwl_init_he_hw_capab(trans, data, sband, tx_chains, rx_chains);
+	else
+		sband->n_channels = 0;
 	if (n_channels != n_used)
 		IWL_ERR_DEV(dev, "NVM: used only %d of %d channels\n",
 			    n_used, n_channels);

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

@@ -165,5 +165,6 @@
 #define IWL_MVM_FTM_INITIATOR_SMOOTH_UNDERSHOOT 20016
 #define IWL_MVM_FTM_INITIATOR_SMOOTH_OVERSHOOT  20016
 #define IWL_MVM_FTM_INITIATOR_SMOOTH_AGE_SEC    2
+#define IWL_MVM_DISABLE_AP_FILS			false
 
 #endif /* __MVM_CONSTANTS_H */

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

@@ -61,6 +61,7 @@
  *****************************************************************************/
 
 #include <linux/etherdevice.h>
+#include <linux/crc32.h>
 #include <net/mac80211.h>
 #include "iwl-io.h"
 #include "iwl-prph.h"
@@ -980,12 +981,28 @@ static int iwl_mvm_mac_ctxt_send_beacon_v9(struct iwl_mvm *mvm,
 	struct iwl_mac_beacon_cmd beacon_cmd = {};
 	u8 rate = iwl_mvm_mac_ctxt_get_lowest_rate(info, vif);
 	u16 flags;
+	struct ieee80211_chanctx_conf *ctx;
+	int channel;
 
 	flags = iwl_mvm_mac80211_idx_to_hwrate(rate);
 
 	if (rate == IWL_FIRST_CCK_RATE)
 		flags |= IWL_MAC_BEACON_CCK;
 
+	/* Enable FILS on PSC channels only */
+	rcu_read_lock();
+	ctx = rcu_dereference(vif->chanctx_conf);
+	channel = ieee80211_frequency_to_channel(ctx->def.chan->center_freq);
+	WARN_ON(channel == 0);
+	if (cfg80211_channel_is_psc(ctx->def.chan) &&
+	    !IWL_MVM_DISABLE_AP_FILS) {
+		flags |= IWL_MAC_BEACON_FILS;
+		beacon_cmd.short_ssid =
+			cpu_to_le32(~crc32_le(~0, vif->bss_conf.ssid,
+					      vif->bss_conf.ssid_len));
+	}
+	rcu_read_unlock();
+
 	beacon_cmd.flags = cpu_to_le16(flags);
 	beacon_cmd.byte_cnt = cpu_to_le16((u16)beacon->len);
 	beacon_cmd.template_id = cpu_to_le32((u32)mvmvif->id);

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

@@ -566,6 +566,7 @@ int iwl_mvm_mac_setup_register(struct iwl_mvm *mvm)
 
 	hw->wiphy->flags |= WIPHY_FLAG_AP_UAPSD;
 	hw->wiphy->flags |= WIPHY_FLAG_HAS_CHANNEL_SWITCH;
+	hw->wiphy->flags |= WIPHY_FLAG_SPLIT_SCAN_6GHZ;
 
 	hw->wiphy->iface_combinations = iwl_mvm_iface_combinations;
 	hw->wiphy->n_iface_combinations =
@@ -619,6 +620,11 @@ int iwl_mvm_mac_setup_register(struct iwl_mvm *mvm)
 			hw->wiphy->bands[NL80211_BAND_5GHZ]->vht_cap.cap |=
 				IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE;
 	}
+	if (fw_has_capa(&mvm->fw->ucode_capa,
+			IWL_UCODE_TLV_CAPA_PSC_CHAN_SUPPORT) &&
+	    mvm->nvm_data->bands[NL80211_BAND_6GHZ].n_channels)
+		hw->wiphy->bands[NL80211_BAND_6GHZ] =
+			&mvm->nvm_data->bands[NL80211_BAND_6GHZ];
 
 	hw->wiphy->hw_version = mvm->trans->hw_id;
 

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

@@ -2100,6 +2100,8 @@ static inline u8 iwl_mvm_phy_band_from_nl80211(enum nl80211_band band)
 		return PHY_BAND_24;
 	case NL80211_BAND_5GHZ:
 		return PHY_BAND_5;
+	case NL80211_BAND_6GHZ:
+		return PHY_BAND_6;
 	default:
 		WARN_ONCE(1, "Unsupported band (%u)\n", band);
 		return PHY_BAND_5;