qcacmn: Add check to drop mcast loopback packet

Added a check in RX path to detect multicast loopback packets in
qwrap mode. In qwrap mode, there are multiple station vaps and
multicast loopback packet from one station vap should not come into
the other station vap. Added a check for this by iterating through
the vap list and checking if any of the vdev mac address matches
with the source address of the packet.

Also added a new vdev parameter to check if qwrap isolation mode is
enabled. In qwrap isolation mode, loopback packets should not be
dropped.

Change-Id: I7d35bf657a87337871156e4caec9038432e23a87
CRs-fixed: 2149190

dp/inc/cdp_txrx_cmn_struct.h

@@ -600,6 +600,7 @@ enum cdp_pdev_param_type {
  * @CDP_UPDATE_TDLS_FLAGS: tdls link flags
  * @CDP_ENABLE_AP_BRIDGE: set ap_bridging enable/disable
  * @CDP_ENABLE_CIPHER : set cipher type based on security
+ * @CDP_ENABLE_QWRAP_ISOLATION: qwrap isolation mode
  */
 enum cdp_vdev_param_type {
 	CDP_ENABLE_NAWDS,
@@ -609,7 +610,8 @@ enum cdp_vdev_param_type {
 	CDP_UPDATE_TDLS_FLAGS,
 	CDP_CFG_WDS_AGING_TIMER,
 	CDP_ENABLE_AP_BRIDGE,
-	CDP_ENABLE_CIPHER
+	CDP_ENABLE_CIPHER,
+	CDP_ENABLE_QWRAP_ISOLATION
 };
 
 #define TXRX_FW_STATS_TXSTATS                     1

dp/wifi3.0/dp_main.c

@@ -5089,6 +5089,9 @@ static void dp_set_vdev_param(struct cdp_vdev *vdev_handle,
 	case CDP_ENABLE_CIPHER:
 		vdev->sec_type = val;
 		break;
+	case CDP_ENABLE_QWRAP_ISOLATION:
+		vdev->isolation_vdev = val;
+		break;
 	default:
 		break;
 	}

dp/wifi3.0/dp_rx.h

@@ -613,6 +613,50 @@ static inline QDF_STATUS dp_rx_ast_set_active(struct dp_soc *soc, uint16_t sa_id
 }
 #endif
 
+/*
+ * check_qwrap_multicast_loopback() - Check if rx packet is a loopback packet.
+ *					In qwrap mode, packets originated from
+ *					any vdev should not loopback and
+ *					should be dropped.
+ * @vdev: vdev on which rx packet is received
+ * @nbuf: rx pkt
+ *
+ */
+#if ATH_SUPPORT_WRAP
+static inline bool check_qwrap_multicast_loopback(struct dp_vdev *vdev,
+						qdf_nbuf_t nbuf)
+{
+	struct dp_vdev *psta_vdev;
+	struct dp_pdev *pdev = vdev->pdev;
+	uint8_t *data = qdf_nbuf_data(nbuf);
+
+	if (qdf_unlikely(vdev->proxysta_vdev)) {
+		/* In qwrap isolation mode, allow loopback packets as all
+		 * packets go to RootAP and Loopback on the mpsta.
+		 */
+		if (vdev->isolation_vdev)
+			return false;
+		TAILQ_FOREACH(psta_vdev, &pdev->vdev_list, vdev_list_elem) {
+			if (qdf_unlikely(psta_vdev->proxysta_vdev &&
+				!qdf_mem_cmp(psta_vdev->mac_addr.raw,
+				&data[DP_MAC_ADDR_LEN], DP_MAC_ADDR_LEN))) {
+				/* Drop packet if source address is equal to
+				 * any of the vdev addresses.
+				 */
+				return true;
+			}
+		}
+	}
+	return false;
+}
+#else
+static inline bool check_qwrap_multicast_loopback(struct dp_vdev *vdev,
+						qdf_nbuf_t nbuf)
+{
+	return false;
+}
+#endif
+
 /*
  * dp_rx_buffers_replenish() - replenish rxdma ring with rx nbufs
  *			       called during dp rx initialization

dp/wifi3.0/dp_rx_err.c

@@ -485,6 +485,16 @@ dp_rx_null_q_desc_handle(struct dp_soc *soc,
 		qdf_nbuf_free(nbuf);
 		return;
 	}
+	/*
+	 * In qwrap mode if the received packet matches with any of the vdev
+	 * mac addresses, drop it. Donot receive multicast packets originated
+	 * from any proxysta.
+	 */
+	if (check_qwrap_multicast_loopback(vdev, nbuf)) {
+		qdf_nbuf_free(nbuf);
+		return;
+	}
+
 
 	if (qdf_unlikely((peer->nawds_enabled == true) &&
 			hal_rx_msdu_end_da_is_mcbc_get(rx_tlv_hdr))) {

dp/wifi3.0/dp_types.h

@@ -1227,6 +1227,8 @@ struct dp_vdev {
 
 	/* Is this a proxySTA VAP */
 	bool proxysta_vdev;
+	/* Is isolation mode enabled */
+	bool isolation_vdev;
 
 	/* Address search flags to be configured in HAL descriptor */
 	uint8_t hal_desc_addr_search_flags;