qcacmn: Add cfg_dp_sg_enable to get ini key dp_sg_support

Add cfg_dp_sg_enable to get ini key dp_sg_support by cdp_cfg_get.
And add some comments for CFG_DP_SG to clarify more.

Change-Id: I34de242eacbdcf55398afe64b91f5534f205fa22
CRs-Fixed: 2822536

dp/inc/cdp_txrx_cmn_struct.h

@@ -2357,6 +2357,7 @@ enum cdp_dp_cfg {
 	cfg_dp_tso_enable,
 	cfg_dp_lro_enable,
 	cfg_dp_gro_enable,
+	cfg_dp_sg_enable,
 	cfg_dp_tx_flow_start_queue_offset,
 	cfg_dp_tx_flow_stop_queue_threshold,
 	cfg_dp_ipa_uc_tx_buf_size,

dp/inc/cdp_txrx_mob_def.h

@@ -315,6 +315,7 @@ struct txrx_pdev_cfg_param_t {
 	bool gro_enable;
 	bool tso_enable;
 	bool lro_enable;
+	bool sg_enable;
 	bool enable_data_stall_detection;
 	bool enable_flow_steering;
 	bool disable_intra_bss_fwd;

dp/wifi3.0/dp_main.c

@@ -10728,6 +10728,9 @@ static uint32_t dp_get_cfg(struct cdp_soc_t *soc, enum cdp_dp_cfg cfg)
 	case cfg_dp_gro_enable:
 		value = dpsoc->wlan_cfg_ctx->gro_enabled;
 		break;
+	case cfg_dp_sg_enable:
+		value = dpsoc->wlan_cfg_ctx->sg_enabled;
+		break;
 	case cfg_dp_tx_flow_start_queue_offset:
 		value = dpsoc->wlan_cfg_ctx->tx_flow_start_queue_offset;
 		break;

wlan_cfg/cfg_dp.h

@@ -604,6 +604,22 @@
 	CFG_INI_BOOL("LROEnable", WLAN_LRO_ENABLE, \
 	"DP LRO Enable")
 
+/*
+ * <ini>
+ * CFG_DP_SG - Enable the SG feature standalonely
+ * @Min: 0
+ * @Max: 1
+ * @Default: 1
+ *
+ * This ini entry is used to enable/disable SG feature standalonely.
+ * Also does Rome support SG on TX, lithium does not.
+ * For example the lithium does not support SG on UDP frames.
+ * Which is able to handle SG only for TSO frames(in case TSO is enabled).
+ *
+ * Usage: External
+ *
+ * </ini>
+ */
 #define CFG_DP_SG \
 	CFG_INI_BOOL("dp_sg_support", false, \
 	"DP SG Enable")