1 files changed, 14 insertions, 4 deletions

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 03ac7690b5c4..14d0dc7ba3c9 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -1370,7 +1370,7 @@ fec_enet_hwtstamp(struct fec_enet_private *fep, unsigned ts,
 }
 
 static void
-fec_enet_tx_queue(struct net_device *ndev, u16 queue_id)
+fec_enet_tx_queue(struct net_device *ndev, u16 queue_id, int budget)
 {
 	struct	fec_enet_private *fep;
 	struct xdp_frame *xdpf;
@@ -1414,6 +1414,14 @@ fec_enet_tx_queue(struct net_device *ndev, u16 queue_id)
 			if (!skb)
 				goto tx_buf_done;
 		} else {
+			/* Tx processing cannot call any XDP (or page pool) APIs if
+			 * the "budget" is 0. Because NAPI is called with budget of
+			 * 0 (such as netpoll) indicates we may be in an IRQ context,
+			 * however, we can't use the page pool from IRQ context.
+			 */
+			if (unlikely(!budget))
+				break;
+
 			xdpf = txq->tx_buf[index].xdp;
 			if (bdp->cbd_bufaddr)
 				dma_unmap_single(&fep->pdev->dev,
@@ -1506,14 +1514,14 @@ tx_buf_done:
 		writel(0, txq->bd.reg_desc_active);
 }
 
-static void fec_enet_tx(struct net_device *ndev)
+static void fec_enet_tx(struct net_device *ndev, int budget)
 {
 	struct fec_enet_private *fep = netdev_priv(ndev);
 	int i;
 
 	/* Make sure that AVB queues are processed first. */
 	for (i = fep->num_tx_queues - 1; i >= 0; i--)
-		fec_enet_tx_queue(ndev, i);
+		fec_enet_tx_queue(ndev, i, budget);
 }
 
 static void fec_enet_update_cbd(struct fec_enet_priv_rx_q *rxq,
@@ -1856,7 +1864,7 @@ static int fec_enet_rx_napi(struct napi_struct *napi, int budget)
 
 	do {
 		done += fec_enet_rx(ndev, budget - done);
-		fec_enet_tx(ndev);
+		fec_enet_tx(ndev, budget);
 	} while ((done < budget) && fec_enet_collect_events(fep));
 
 	if (done < budget) {
@@ -3874,6 +3882,8 @@ static int fec_enet_xdp_xmit(struct net_device *dev,
 
 	__netif_tx_lock(nq, cpu);
 
+	/* Avoid tx timeout as XDP shares the queue with kernel stack */
+	txq_trans_cond_update(nq);
 	for (i = 0; i < num_frames; i++) {
 		if (fec_enet_txq_xmit_frame(fep, txq, frames[i]) < 0)
 			break;