qcacmn: monitor RXDMA drop feature

Adds new INI variable for threshold control.
Host sends message to target with new threshold info.
If buffer reaches threshold then MAC drops incoming monitor frames.

Change-Id: Id659d7df68a5ec0b22fb571dc1ffa4990f8fcc4f

dp/wifi3.0/dp_htt.c

@@ -1013,6 +1013,8 @@ int htt_h2t_rx_ring_cfg(struct htt_soc *htt_soc, int pdev_id,
 	uint32_t htt_ring_type, htt_ring_id;
 	uint32_t tlv_filter;
 	uint8_t *htt_logger_bufp;
+	struct wlan_cfg_dp_soc_ctxt *wlan_cfg_ctx = soc->dp_soc->wlan_cfg_ctx;
+	uint32_t mon_drop_th = wlan_cfg_get_mon_drop_thresh(wlan_cfg_ctx);
 
 	htt_msg = qdf_nbuf_alloc(soc->osdev,
 		HTT_MSG_BUF_SIZE(HTT_RX_RING_SELECTION_CFG_SZ),
@@ -1101,6 +1103,13 @@ int htt_h2t_rx_ring_cfg(struct htt_soc *htt_soc, int pdev_id,
 	HTT_RX_RING_SELECTION_CFG_RX_OFFSETS_VALID_SET(*msg_word,
 						htt_tlv_filter->offset_valid);
 
+	if (mon_drop_th > 0)
+		HTT_RX_RING_SELECTION_CFG_DROP_THRESHOLD_VALID_SET(*msg_word,
+								   1);
+	else
+		HTT_RX_RING_SELECTION_CFG_DROP_THRESHOLD_VALID_SET(*msg_word,
+								   0);
+
 	/* word 1 */
 	msg_word++;
 	*msg_word = 0;
@@ -1664,8 +1673,17 @@ int htt_h2t_rx_ring_cfg(struct htt_soc *htt_soc, int pdev_id,
 		*msg_word = 0;
 		HTT_RX_RING_SELECTION_CFG_RX_ATTENTION_OFFSET_SET(*msg_word,
 					htt_tlv_filter->rx_attn_offset);
+		msg_word++;
+		*msg_word = 0;
+	} else {
+		msg_word += 4;
+		*msg_word = 0;
 	}
 
+	if (mon_drop_th > 0)
+		HTT_RX_RING_SELECTION_CFG_RX_DROP_THRESHOLD_SET(*msg_word,
+								mon_drop_th);
+
 	/* "response_required" field should be set if a HTT response message is
 	 * required after setting up the ring.
 	 */