diff --git a/lib/librte_eventdev/rte_event_eth_rx_adapter.h b/lib/librte_eventdev/rte_event_eth_rx_adapter.h
index 2314b93..a64eed0 100644
--- a/lib/librte_eventdev/rte_event_eth_rx_adapter.h
+++ b/lib/librte_eventdev/rte_event_eth_rx_adapter.h
@@ -66,16 +66,17 @@
  * For SW based packet transfers, i.e., when the
  * RTE_EVENT_ETH_RX_ADAPTER_CAP_INTERNAL_PORT is not set in the adapter's
  * capabilities flags for a particular ethernet device, the service function
- * temporarily enqueues mbufs to an event buffer before batch enqueueing these
+ * temporarily enqueues events to an event buffer before batch enqueueing these
  * to the event device. If the buffer fills up, the service function stops
  * dequeueing packets from the ethernet device. The application may want to
  * monitor the buffer fill level and instruct the service function to
- * selectively buffer packets. The application may also use some other
+ * selectively buffer events. The application may also use some other
  * criteria to decide which packets should enter the event device even when
- * the event buffer fill level is low. The
- * rte_event_eth_rx_adapter_cb_register() function allows the
- * application to register a callback that selects which packets to enqueue
- * to the event device.
+ * the event buffer fill level is low or may want to enqueue packets to an
+ * internal event port. The rte_event_eth_rx_adapter_cb_register() function
+ * allows the application to register a callback that selects which packets are
+ * enqueued to the event device by the SW adapter. The callback interface is
+ * event based so the callback can also modify the event data if it needs to.
  */
 
 #ifdef __cplusplus
@@ -217,12 +218,23 @@ struct rte_event_eth_rx_adapter_stats {
  * @b EXPERIMENTAL: this API may change without prior notice
  *
  * Callback function invoked by the SW adapter before it continues
- * to process packets. The callback is passed the size of the enqueue
+ * to process events. The callback is passed the size of the enqueue
  * buffer in the SW adapter and the occupancy of the buffer. The
- * callback can use these values to decide which mbufs should be
- * enqueued to the event device. If the return value of the callback
- * is less than nb_mbuf then the SW adapter uses the return value to
- * enqueue enq_mbuf[] to the event device.
+ * callback can use these values to decide which events are
+ * enqueued to the event device by the SW adapter. The callback may
+ * also enqueue events internally using its own event port. The SW
+ * adapter populates the event information based on the Rx queue
+ * configuration in the adapter. The callback can modify the this event
+ * information for the events to be enqueued by the SW adapter.
+ *
+ * The callback return value is the number of events from the
+ * beginning of the event array that are to be enqueued by
+ * the SW adapter. It is the callback's responsibility to arrange
+ * these events at the beginning of the array, if these events are
+ * not contiguous in the original array. The *nb_dropped* parameter is
+ * a pointer to the number of events dropped by the callback, this
+ * number is used by the adapter to indicate the number of dropped packets
+ * as part of its statistics.
  *
  * @param eth_dev_id
  *  Port identifier of the Ethernet device.
@@ -231,27 +243,26 @@ struct rte_event_eth_rx_adapter_stats {
  * @param enqueue_buf_size
  *  Total enqueue buffer size.
  * @param enqueue_buf_count
- *  mbuf count in enqueue buffer.
- * @param mbuf
- *  mbuf array.
- * @param nb_mbuf
- *  mbuf count.
+ *  Event count in enqueue buffer.
+ * @param[in, out] ev
+ *  Event array.
+ * @param nb_event
+ *  Event array length.
  * @param cb_arg
  *  Callback argument.
- * @param[out] enq_mbuf
- *  The adapter enqueues enq_mbuf[] if the return value of the
- *  callback is less than nb_mbuf
+ * @param[out] nb_dropped
+ *  Packets dropped by callback.
  * @return
- *  Returns the number of mbufs should be enqueued to eventdev
+ *  - The number of events to be enqueued by the SW adapter.
  */
 typedef uint16_t (*rte_event_eth_rx_adapter_cb_fn)(uint16_t eth_dev_id,
 						uint16_t queue_id,
 						uint32_t enqueue_buf_size,
 						uint32_t enqueue_buf_count,
-						struct rte_mbuf **mbuf,
-						uint16_t nb_mbuf,
+						struct rte_event *ev,
+						uint16_t nb_event,
 						void *cb_arg,
-						struct rte_mbuf **enq_buf);
+						uint16_t *nb_dropped);
 
 /**
  * @warning
