qcacld-3.0: Implement WLAN_FEATURE_SARV1_TO_SARV2

SARv1 to SARv2 upgrade can have the following problem:
1) Userspace application was written to use SARv1 BDF entries
2) Product is configured with SAR V2 BDF entries

So introduce WLAN_FEATURE_SARV1_TO_SARV2 which has the logic:
If this feature is enabled, and if the firmware is configured with SAR
V2 support, and if the incoming request is to enable a SAR V1 BDF
entry, then the WMI command is generated to actually configure a SAR
V2 BDF entry.

CRs-Fixed: 2282071
Change-Id: I1f4c65d0315b56af6646ca1d5491eaa9c1f732a5

core/hdd/src/wlan_hdd_cfg80211.c

@@ -11589,6 +11589,96 @@ static int wlan_hdd_cfg80211_sar_convert_limit_set(u32 nl80211_value,
 	return ret;
 }
 
+#ifdef WLAN_FEATURE_SARV1_TO_SARV2
+/**
+ * hdd_convert_sarv1_to_sarv2() - convert SAR V1 BDF reference to SAR V2
+ * @hdd_ctx: The HDD global context
+ * @tb: The parsed array of netlink attributes
+ * @sar_limit_cmd: The WMI command to be filled
+ *
+ * This feature/function is designed to solve the following problem:
+ * 1) Userspace application was written to use SARv1 BDF entries
+ * 2) Product is configured with SAR V2 BDF entries
+ *
+ * So if this feature is enabled, and if the firmware is configured
+ * with SAR V2 support, and if the incoming request is to enable a SAR
+ * V1 BDF entry, then the WMI command is generated to actually
+ * configure a SAR V2 BDF entry.
+ *
+ * Return: true if conversion was performed and @sar_limit_cmd is
+ * ready to be sent to firmware. Otherwise false in which case the
+ * normal parsing logic should be applied.
+ */
+
+static bool
+hdd_convert_sarv1_to_sarv2(struct hdd_context *hdd_ctx,
+			   struct nlattr *tb[],
+			   struct sar_limit_cmd_params *sar_limit_cmd)
+{
+	struct nlattr *attr;
+	uint32_t bdf_index, set;
+	struct sar_limit_cmd_row *row;
+
+	if (hdd_ctx->sar_version != SAR_VERSION_2) {
+		hdd_debug("SAR version: %d", hdd_ctx->sar_version);
+		return false;
+	}
+
+	attr = tb[QCA_WLAN_VENDOR_ATTR_SAR_LIMITS_SAR_ENABLE];
+	if (!attr)
+		return false;
+
+	bdf_index = nla_get_u32(attr);
+
+	if ((bdf_index >= QCA_WLAN_VENDOR_ATTR_SAR_LIMITS_SELECT_BDF0) &&
+	    (bdf_index <= QCA_WLAN_VENDOR_ATTR_SAR_LIMITS_SELECT_BDF4)) {
+		set = QCA_WLAN_VENDOR_ATTR_SAR_LIMITS_SELECT_V2_0;
+	} else if (bdf_index == QCA_WLAN_VENDOR_ATTR_SAR_LIMITS_SELECT_NONE) {
+		set = QCA_WLAN_VENDOR_ATTR_SAR_LIMITS_SELECT_NONE;
+		bdf_index = QCA_WLAN_VENDOR_ATTR_SAR_LIMITS_SELECT_BDF0;
+	} else {
+		return false;
+	}
+
+	/* Need two rows to hold the per-chain V2 power index
+	 * To disable SARv2 limit, send chain, num_limits_row and
+	 * power limit set to 0 (except power index 0xff)
+	 */
+	row = qdf_mem_malloc(2 * sizeof(*row));
+	if (!row)
+		return false;
+
+	if (wlan_hdd_cfg80211_sar_convert_limit_set(
+		set, &sar_limit_cmd->sar_enable)) {
+		hdd_err("Failed to convert SAR limit to WMI value");
+		return false;
+	}
+
+	sar_limit_cmd->commit_limits = 1;
+	sar_limit_cmd->num_limit_rows = 2;
+	sar_limit_cmd->sar_limit_row_list = row;
+	row[0].limit_value = bdf_index;
+	row[1].limit_value = row[0].limit_value;
+	row[0].chain_id = 0;
+	row[1].chain_id = 1;
+	row[0].validity_bitmap = WMI_SAR_CHAIN_ID_VALID_MASK;
+	row[1].validity_bitmap = WMI_SAR_CHAIN_ID_VALID_MASK;
+
+	return true;
+}
+
+#else /* WLAN_FEATURE_SARV1_TO_SARV2 */
+
+static bool
+hdd_convert_sarv1_to_sarv2(struct hdd_context *hdd_ctx,
+			   struct nlattr *tb[],
+			   struct sar_limit_cmd_params *sar_limit_cmd)
+{
+	return false;
+}
+
+#endif /* WLAN_FEATURE_SARV1_TO_SARV2 */
+
 /**
  * wlan_hdd_cfg80211_sar_convert_band() - Convert WLAN band value
  * @nl80211_value:    Vendor command attribute value
@@ -11989,6 +12079,10 @@ static int __wlan_hdd_set_sar_power_limits(struct wiphy *wiphy,
 		return -EINVAL;
 	}
 
+	/* is special SAR V1 => SAR V2 logic enabled and applicable? */
+	if (hdd_convert_sarv1_to_sarv2(hdd_ctx, tb, &sar_limit_cmd))
+		goto send_sar_limits;
+
 	/* Vendor command manadates all SAR Specs in single call */
 	sar_limit_cmd.commit_limits = 1;
 	sar_limit_cmd.sar_enable = WMI_SAR_FEATURE_NO_CHANGE;