wifi: iwlwifi: mvm: add support for Extra EHT LTF

Add support for Extra EHT LTF defined in 9.4.2.313
EHT Capabilities element.
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230613155501.de019d7cc174.I806f0f6042b89274192701a60b4f7900822db666@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

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

@@ -21,6 +21,7 @@
  * @IWL_TLC_MNG_CFG_FLAGS_HE_DCM_NSS_2_MSK: enable HE Dual Carrier Modulation
  *					    for BPSK (MCS 0) with 2 spatial
  *					    streams
+ * @IWL_TLC_MNG_CFG_FLAGS_EHT_EXTRA_LTF_MSK: enable support for EHT extra LTF
  */
 enum iwl_tlc_mng_cfg_flags {
 	IWL_TLC_MNG_CFG_FLAGS_STBC_MSK			= BIT(0),
@@ -28,6 +29,7 @@ enum iwl_tlc_mng_cfg_flags {
 	IWL_TLC_MNG_CFG_FLAGS_HE_STBC_160MHZ_MSK	= BIT(2),
 	IWL_TLC_MNG_CFG_FLAGS_HE_DCM_NSS_1_MSK		= BIT(3),
 	IWL_TLC_MNG_CFG_FLAGS_HE_DCM_NSS_2_MSK		= BIT(4),
+	IWL_TLC_MNG_CFG_FLAGS_EHT_EXTRA_LTF_MSK		= BIT(6),
 };
 
 /**

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

@@ -1012,6 +1012,8 @@ iwl_nvm_fixup_sband_iftd(struct iwl_trans *trans,
 		iftype_data->eht_cap.eht_cap_elem.phy_cap_info[6] &=
 			~(IEEE80211_EHT_PHY_CAP6_MCS15_SUPP_MASK |
 			  IEEE80211_EHT_PHY_CAP6_EHT_DUP_6GHZ_SUPP);
+		iftype_data->eht_cap.eht_cap_elem.phy_cap_info[5] |=
+			IEEE80211_EHT_PHY_CAP5_SUPP_EXTRA_EHT_LTF;
 	}
 
 	if (fw_has_capa(&fw->ucode_capa, IWL_UCODE_TLV_CAPA_BROADCAST_TWT))

drivers/net/wireless/intel/iwlwifi/mvm/rs-fw.c

@@ -591,6 +591,21 @@ void iwl_mvm_rs_fw_rate_init(struct iwl_mvm *mvm,
 	int cmd_ver;
 	int ret;
 
+	/* Enable external EHT LTF only for GL device and if there's
+	 * mutual support by AP and client
+	 */
+	if (CSR_HW_REV_TYPE(mvm->trans->hw_rev) == IWL_CFG_MAC_TYPE_GL &&
+	    sband->iftype_data->eht_cap.has_eht &&
+	    sband->iftype_data->eht_cap.eht_cap_elem.phy_cap_info[5] &
+	    IEEE80211_EHT_PHY_CAP5_SUPP_EXTRA_EHT_LTF &&
+	    link_sta->eht_cap.has_eht &&
+	    link_sta->eht_cap.eht_cap_elem.phy_cap_info[5] &
+	    IEEE80211_EHT_PHY_CAP5_SUPP_EXTRA_EHT_LTF) {
+		IWL_DEBUG_RATE(mvm, "Set support for Extra EHT LTF\n");
+		cfg_cmd.flags |=
+			cpu_to_le16(IWL_TLC_MNG_CFG_FLAGS_EHT_EXTRA_LTF_MSK);
+	}
+
 	rcu_read_lock();
 	mvm_link_sta = rcu_dereference(mvmsta->link[link_id]);
 	if (WARN_ON_ONCE(!mvm_link_sta)) {

include/linux/ieee80211.h

@@ -2859,6 +2859,7 @@ ieee80211_he_spr_size(const u8 *he_spr_ie)
 
 /* Maximum number of supported EHT LTF is split */
 #define IEEE80211_EHT_PHY_CAP5_MAX_NUM_SUPP_EHT_LTF_MASK	0xc0
+#define IEEE80211_EHT_PHY_CAP5_SUPP_EXTRA_EHT_LTF		0x40
 #define IEEE80211_EHT_PHY_CAP6_MAX_NUM_SUPP_EHT_LTF_MASK	0x07
 
 #define IEEE80211_EHT_PHY_CAP6_MCS15_SUPP_MASK			0x78