diff --git a/core/dp/txrx/ol_txrx.c b/core/dp/txrx/ol_txrx.c
index a169dba979b4..58b7019fb0f0 100644
--- a/core/dp/txrx/ol_txrx.c
+++ b/core/dp/txrx/ol_txrx.c
@@ -1111,7 +1111,7 @@ ol_txrx_pdev_attach(ol_txrx_soc_handle soc, struct cdp_cfg *ctrl_pdev,
 		    HTC_HANDLE htc_pdev, qdf_device_t osdev, uint8_t pdev_id)
 {
 	struct ol_txrx_pdev_t *pdev;
-	int i;
+	int i, tid;
 
 	pdev = qdf_mem_malloc(sizeof(*pdev));
 	if (!pdev)
@@ -1157,6 +1157,26 @@ ol_txrx_pdev_attach(ol_txrx_soc_handle soc, struct cdp_cfg *ctrl_pdev,
 
 	htt_register_rx_pkt_dump_callback(pdev->htt_pdev,
 			ol_rx_pkt_dump_call);
+
+	/*
+	 * Init the tid --> category table.
+	 * Regular tids (0-15) map to their AC.
+	 * Extension tids get their own categories.
+	 */
+	for (tid = 0; tid < OL_TX_NUM_QOS_TIDS; tid++) {
+		int ac = TXRX_TID_TO_WMM_AC(tid);
+
+		pdev->tid_to_ac[tid] = ac;
+	}
+	pdev->tid_to_ac[OL_TX_NON_QOS_TID] =
+		OL_TX_SCHED_WRR_ADV_CAT_NON_QOS_DATA;
+	pdev->tid_to_ac[OL_TX_MGMT_TID] =
+		OL_TX_SCHED_WRR_ADV_CAT_UCAST_MGMT;
+	pdev->tid_to_ac[OL_TX_NUM_TIDS + OL_TX_VDEV_MCAST_BCAST] =
+		OL_TX_SCHED_WRR_ADV_CAT_MCAST_DATA;
+	pdev->tid_to_ac[OL_TX_NUM_TIDS + OL_TX_VDEV_DEFAULT_MGMT] =
+		OL_TX_SCHED_WRR_ADV_CAT_MCAST_MGMT;
+
 	return (struct cdp_pdev *)pdev;
 
 fail3: