qcacld-3.0: Add support to get bus message size

qcacld-2.0 to qcacld-3.0 propagation

This commit allows the upper layers to query  driver for max
message size between the host & firmware using vendor command.

Change-Id: I21db90c854e6105f00c27dec9389f2cafd4f6508
CRs-Fixed: 965244

core/hdd/inc/wlan_hdd_main.h

@@ -1509,6 +1509,7 @@ struct hdd_context_s {
 	bool start_modules_in_progress;
 	bool update_mac_addr_to_fw;
 	struct acs_dfs_policy acs_policy;
+	uint16_t wmi_max_len;
 };
 
 /*---------------------------------------------------------------------------

core/hdd/src/wlan_hdd_cfg80211.c

@@ -7513,6 +7513,88 @@ static int wlan_hdd_cfg80211_get_wakelock_stats(struct wiphy *wiphy,
 	return ret;
 }
 
+/**
+ * __wlan_hdd_cfg80211_get_bus_size() - Get WMI Bus size
+ * @wiphy:    wiphy structure pointer
+ * @wdev:     Wireless device structure pointer
+ * @data:     Pointer to the data received
+ * @data_len: Length of @data
+ *
+ * This function reads wmi max bus size and fill in the skb with
+ * NL attributes and send up the NL event.
+ * Return: 0 on success; errno on failure
+ */
+static int
+__wlan_hdd_cfg80211_get_bus_size(struct wiphy *wiphy,
+				 struct wireless_dev *wdev,
+				 const void *data, int data_len)
+{
+	hdd_context_t *hdd_ctx = wiphy_priv(wiphy);
+	int ret_val;
+	struct sk_buff *skb;
+	uint32_t nl_buf_len;
+
+	ENTER();
+
+	ret_val = wlan_hdd_validate_context(hdd_ctx);
+	if (ret_val)
+		return ret_val;
+
+	if (QDF_GLOBAL_FTM_MODE == hdd_get_conparam()) {
+		hdd_err("Command not allowed in FTM mode");
+		return -EINVAL;
+	}
+
+	hdd_info("WMI Max Bus size: %d", hdd_ctx->wmi_max_len);
+
+	nl_buf_len = NLMSG_HDRLEN;
+	nl_buf_len +=  (sizeof(hdd_ctx->wmi_max_len) + NLA_HDRLEN);
+
+	skb = cfg80211_vendor_cmd_alloc_reply_skb(hdd_ctx->wiphy, nl_buf_len);
+	if (!skb) {
+		hdd_err("cfg80211_vendor_cmd_alloc_reply_skb failed");
+		return -ENOMEM;
+	}
+
+	if (nla_put_u16(skb, QCA_WLAN_VENDOR_ATTR_DRV_INFO_BUS_SIZE,
+			hdd_ctx->wmi_max_len)) {
+		hdd_err("nla put failure");
+		goto nla_put_failure;
+	}
+
+	cfg80211_vendor_cmd_reply(skb);
+
+	EXIT();
+
+	return 0;
+
+nla_put_failure:
+	kfree_skb(skb);
+	return -EINVAL;
+}
+
+/**
+ * wlan_hdd_cfg80211_get_bus_size() - SSR Wrapper to Get Bus size
+ * @wiphy:    wiphy structure pointer
+ * @wdev:     Wireless device structure pointer
+ * @data:     Pointer to the data received
+ * @data_len: Length of @data
+ *
+ * Return: 0 on success; errno on failure
+ */
+static int wlan_hdd_cfg80211_get_bus_size(struct wiphy *wiphy,
+					  struct wireless_dev *wdev,
+					  const void *data, int data_len)
+{
+	int ret;
+
+	cds_ssr_protect(__func__);
+	ret = __wlan_hdd_cfg80211_get_bus_size(wiphy, wdev, data, data_len);
+	cds_ssr_unprotect(__func__);
+
+	return ret;
+}
+
 /**
  *__wlan_hdd_cfg80211_setband() - set band
  * @wiphy: Pointer to wireless phy
@@ -8243,6 +8325,14 @@ const struct wiphy_vendor_command hdd_wiphy_vendor_commands[] = {
 			 WIPHY_VENDOR_CMD_NEED_RUNNING,
 		.doit = wlan_hdd_cfg80211_get_wakelock_stats
 	},
+	{
+		.info.vendor_id = QCA_NL80211_VENDOR_ID,
+		.info.subcmd = QCA_NL80211_VENDOR_SUBCMD_GET_BUS_SIZE,
+		.flags = WIPHY_VENDOR_CMD_NEED_WDEV |
+			 WIPHY_VENDOR_CMD_NEED_NETDEV |
+			 WIPHY_VENDOR_CMD_NEED_RUNNING,
+		.doit = wlan_hdd_cfg80211_get_bus_size
+	},
 	{
 		.info.subcmd = QCA_NL80211_VENDOR_SUBCMD_SETBAND,
 		.flags = WIPHY_VENDOR_CMD_NEED_WDEV |

core/hdd/src/wlan_hdd_cfg80211.h

@@ -383,6 +383,7 @@ enum qca_nl80211_vendor_subcmds {
 	QCA_NL80211_VENDOR_SUBCMD_ND_OFFLOAD = 82,
 
 	QCA_NL80211_VENDOR_SUBCMD_PACKET_FILTER = 83,
+	QCA_NL80211_VENDOR_SUBCMD_GET_BUS_SIZE = 84,
 
 	QCA_NL80211_VENDOR_SUBCMD_GET_WAKE_REASON_STATS = 85,
 
@@ -2875,6 +2876,22 @@ enum qca_wlan_vendor_attr_p2p_listen_offload {
 	QCA_WLAN_VENDOR_ATTR_P2P_LISTEN_OFFLOAD_AFTER_LAST - 1
 };
 
+/**
+ * enum qca_wlan_vendor_drv_info - WLAN driver info
+ * @QCA_WLAN_VENDOR_ATTR_DRV_INFO_INVALID: Invalid
+ * @QCA_WLAN_VENDOR_ATTR_DRV_INFO_BUS_SIZE: Maximum Message size info
+ * between Firmware & Host.
+ */
+enum qca_wlan_vendor_drv_info {
+	QCA_WLAN_VENDOR_ATTR_DRV_INFO_INVALID = 0,
+	QCA_WLAN_VENDOR_ATTR_DRV_INFO_BUS_SIZE,
+
+	/* keep last */
+	QCA_WLAN_VENDOR_ATTR_DRV_INFO_AFTER_LAST,
+	QCA_WLAN_VENDOR_ATTR_DRV_INFO_MAX =
+		QCA_WLAN_VENDOR_ATTR_DRV_INFO_AFTER_LAST - 1,
+};
+
 struct cfg80211_bss *wlan_hdd_cfg80211_update_bss_db(hdd_adapter_t *pAdapter,
 						tCsrRoamInfo *pRoamInfo);
 

core/hdd/src/wlan_hdd_main.c

@@ -1482,6 +1482,8 @@ void hdd_update_tgt_cfg(void *context, void *param)
 	if (hdd_ctx->bpf_enabled)
 		hdd_ctx->config->maxWoWFilters = WMA_STA_WOW_DEFAULT_PTRN_MAX;
 
+	hdd_ctx->wmi_max_len = cfg->wmi_max_len;
+
 	/* Configure NAN datapath features */
 	hdd_nan_datapath_target_config(hdd_ctx, cfg);
 }

core/wma/inc/wma_tgt_cfg.h

@@ -175,5 +175,6 @@ struct wma_tgt_cfg {
 	bool nan_datapath_enabled;
 #endif
 	bool sub_20_support;
+	uint16_t wmi_max_len;
 };
 #endif /* WMA_TGT_CFG_H */

core/wma/src/wma_main.c

@@ -82,6 +82,8 @@
 
 #define WMA_LOG_COMPLETION_TIMER 10000 /* 10 seconds */
 
+#define WMI_TLV_HEADROOM 128
+
 static uint32_t g_fw_wlan_feat_caps;
 
 /**
@@ -4043,6 +4045,8 @@ static void wma_update_hdd_cfg(tp_wma_handle wma_handle)
 	wma_update_ra_rate_limit(wma_handle, &tgt_cfg);
 	tgt_cfg.fine_time_measurement_cap =
 		wma_handle->fine_time_measurement_cap;
+	tgt_cfg.wmi_max_len = wmi_get_max_msg_len(wma_handle->wmi_handle)
+			      - WMI_TLV_HEADROOM;
 	wma_setup_egap_support(&tgt_cfg, wma_handle);
 
 	wma_update_hdd_cfg_ndp(wma_handle, &tgt_cfg);