qcacld-3.0: Do not connect in HE mode if HE LDPC check fails

Do not connect in HE mode if the AP does not support LDPC with more
than 20M bandwidth or in 20M if it advertise the MCS11 support.
Connect in 11ac/11n mode if the LDPC check fails.

Change-Id: I8cf9bb30fd897fe4016585cb79a38fbdc78c06fd
CRs-Fixed: 2181259

core/mac/inc/sir_api.h

@@ -7459,6 +7459,11 @@ struct ppet_hdr {
 	((HE_MCS_MSK_4_NSS(nss) & (mcs_set)) != HE_MCS_MSK_4_NSS(nss))
 
 #define HE_MCS_ALL_DISABLED                   0xFFFF
+
+#define HE_MCS_0_7     0x0
+#define HE_MCS_0_9     0x1
+#define HE_MCS_0_11    0x2
+#define HE_MCS_DISABLE 0x3
 /*
  * Following formuala has been arrived at using karnaugh map and unit tested
  * with sample code. Take MCS for each NSS as 2 bit value first and solve for

core/mac/src/pe/lim/lim_prop_exts_utils.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011-2017 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2011-2018 The Linux Foundation. All rights reserved.
  *
  * Previously licensed under the ISC license by Qualcomm Atheros, Inc.
  *
@@ -283,10 +283,54 @@ static void lim_extract_he_op(tpPESession session,
 		pe_debug("he_op.default_pe %d", session->he_op.default_pe);
 	}
 }
+
+static bool lim_check_he_80_mcs11_supp(tpPESession session,
+		tSirProbeRespBeacon *beacon_struct) {
+	uint8_t rx_mcs_map;
+	uint8_t tx_mcs_map;
+	rx_mcs_map = beacon_struct->he_cap.rx_he_mcs_map_lt_80;
+	tx_mcs_map = beacon_struct->he_cap.tx_he_mcs_map_lt_80;
+	if ((session->nss == NSS_1x1_MODE) &&
+		((HE_GET_MCS_4_NSS(rx_mcs_map, 1) == HE_MCS_0_11) ||
+		(HE_GET_MCS_4_NSS(tx_mcs_map, 1) == HE_MCS_0_11)))
+		return true;
+
+	if ((session->nss == NSS_2x2_MODE) &&
+		((HE_GET_MCS_4_NSS(rx_mcs_map, 2) == HE_MCS_0_11) ||
+		(HE_GET_MCS_4_NSS(tx_mcs_map, 2) == HE_MCS_0_11)))
+		return true;
+
+	return false;
+}
+
+static void lim_check_he_ldpc_cap(tpPESession session,
+		tSirProbeRespBeacon *beacon_struct)
+{
+	if (session->he_capable && beacon_struct->he_cap.present) {
+		if (beacon_struct->he_cap.ldpc_coding)
+			return;
+		else if ((session->ch_width == CH_WIDTH_20MHZ) &&
+				!lim_check_he_80_mcs11_supp(session,
+					beacon_struct))
+			return;
+		session->he_capable = false;
+		pe_err("LDPC check failed for HE operation");
+		if (session->vhtCapability) {
+			session->dot11mode = WNI_CFG_DOT11_MODE_11AC;
+			pe_debug("Update dot11mode to 11ac");
+		} else {
+			session->dot11mode = WNI_CFG_DOT11_MODE_11N;
+			pe_debug("Update dot11mode to 11N");
+		}
+	}
+}
 #else
 static inline void lim_extract_he_op(tpPESession session,
 		tSirProbeRespBeacon *beacon_struct)
 {}
+static void lim_check_he_ldpc_cap(tpPESession session,
+		tSirProbeRespBeacon *beacon_struct)
+{}
 #endif
 /**
  * lim_extract_ap_capability() - extract AP's HCF/WME/WSM capability
@@ -522,6 +566,7 @@ lim_extract_ap_capability(tpAniSirGlobal mac_ctx, uint8_t *p_ie,
 			pe_err("AP does not support op_mode rx");
 		}
 	}
+	lim_check_he_ldpc_cap(session, beacon_struct);
 	lim_extract_he_op(session, beacon_struct);
 	/* Extract the UAPSD flag from WMM Parameter element */
 	if (beacon_struct->wmeEdcaPresent)