dpaa2-eth: return num_enqueued frames from enqueue callback

The enqueue dpaa2-eth callback now returns the number of successfully
enqueued frames. This is a preliminary patch necessary for adding
support for bulk ring mode enqueue.
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c

 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
 /* Copyright 2014-2016 Freescale Semiconductor Inc.
- * Copyright 2016-2019 NXP
+ * Copyright 2016-2020 NXP
  */
 #include <linux/init.h>
 #include <linux/module.h>
@@ -268,7 +268,7 @@ static int xdp_enqueue(struct dpaa2_eth_priv *priv, struct dpaa2_fd *fd,
 
 	fq = &priv->fq[queue_id];
 	for (i = 0; i < DPAA2_ETH_ENQUEUE_RETRIES; i++) {
-		err = priv->enqueue(priv, fq, fd, 0);
+		err = priv->enqueue(priv, fq, fd, 0, NULL);
 		if (err != -EBUSY)
 			break;
 	}
@@ -847,7 +847,7 @@ static netdev_tx_t dpaa2_eth_tx(struct sk_buff *skb, struct net_device *net_dev)
 	 * the Tx confirmation callback for this frame
 	 */
 	for (i = 0; i < DPAA2_ETH_ENQUEUE_RETRIES; i++) {
-		err = priv->enqueue(priv, fq, &fd, prio);
+		err = priv->enqueue(priv, fq, &fd, prio, NULL);
 		if (err != -EBUSY)
 			break;
 	}
@@ -1937,7 +1937,7 @@ static int dpaa2_eth_xdp_xmit_frame(struct net_device *net_dev,
 
 	fq = &priv->fq[smp_processor_id() % dpaa2_eth_queue_count(priv)];
 	for (i = 0; i < DPAA2_ETH_ENQUEUE_RETRIES; i++) {
-		err = priv->enqueue(priv, fq, &fd, 0);
+		err = priv->enqueue(priv, fq, &fd, 0, NULL);
 		if (err != -EBUSY)
 			break;
 	}
@@ -2523,19 +2523,31 @@ static int set_buffer_layout(struct dpaa2_eth_priv *priv)
 
 static inline int dpaa2_eth_enqueue_qd(struct dpaa2_eth_priv *priv,
 				       struct dpaa2_eth_fq *fq,
-				       struct dpaa2_fd *fd, u8 prio)
+				       struct dpaa2_fd *fd, u8 prio,
+				       int *frames_enqueued)
 {
-	return dpaa2_io_service_enqueue_qd(fq->channel->dpio,
-					   priv->tx_qdid, prio,
-					   fq->tx_qdbin, fd);
+	int err;
+
+	err = dpaa2_io_service_enqueue_qd(fq->channel->dpio,
+					  priv->tx_qdid, prio,
+					  fq->tx_qdbin, fd);
+	if (!err && frames_enqueued)
+		*frames_enqueued = 1;
+	return err;
 }
 
 static inline int dpaa2_eth_enqueue_fq(struct dpaa2_eth_priv *priv,
 				       struct dpaa2_eth_fq *fq,
-				       struct dpaa2_fd *fd, u8 prio)
+				       struct dpaa2_fd *fd, u8 prio,
+				       int *frames_enqueued)
 {
-	return dpaa2_io_service_enqueue_fq(fq->channel->dpio,
-					   fq->tx_fqid[prio], fd);
+	int err;
+
+	err = dpaa2_io_service_enqueue_fq(fq->channel->dpio,
+					  fq->tx_fqid[prio], fd);
+	if (!err && frames_enqueued)
+		*frames_enqueued = 1;
+	return err;
 }
 
 static void set_enqueue_mode(struct dpaa2_eth_priv *priv)

drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h

 /* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */
 /* Copyright 2014-2016 Freescale Semiconductor Inc.
- * Copyright 2016 NXP
+ * Copyright 2016-2020 NXP
  */
 
 #ifndef __DPAA2_ETH_H
@@ -371,7 +371,8 @@ struct dpaa2_eth_priv {
 	struct dpaa2_eth_fq fq[DPAA2_ETH_MAX_QUEUES];
 	int (*enqueue)(struct dpaa2_eth_priv *priv,
 		       struct dpaa2_eth_fq *fq,
-		       struct dpaa2_fd *fd, u8 prio);
+		       struct dpaa2_fd *fd, u8 prio,
+		       int *frames_enqueued);
 
 	u8 num_channels;
 	struct dpaa2_eth_channel *channel[DPAA2_ETH_MAX_DPCONS];