Merge branch 'net-renesas-rswitch-fixes'

Yoshihiro Shimoda says:

====================
net: renesas: rswitch: Fix rx and timestamp

I got reports locally about issues on the rswitch driver.
So, fix the issues.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

Author: davem330

drivers/net/ethernet/renesas/rswitch.c

@@ -702,13 +702,14 @@ static bool rswitch_rx(struct net_device *ndev, int *quota)
 	u16 pkt_len;
 	u32 get_ts;
 
+	if (*quota <= 0)
+		return true;
+
 	boguscnt = min_t(int, gq->ring_size, *quota);
 	limit = boguscnt;
 
 	desc = &gq->rx_ring[gq->cur];
 	while ((desc->desc.die_dt & DT_MASK) != DT_FEMPTY) {
-		if (--boguscnt < 0)
-			break;
 		dma_rmb();
 		pkt_len = le16_to_cpu(desc->desc.info_ds) & RX_DS;
 		skb = gq->skbs[gq->cur];
@@ -734,6 +735,9 @@ static bool rswitch_rx(struct net_device *ndev, int *quota)
 
 		gq->cur = rswitch_next_queue_index(gq, true, 1);
 		desc = &gq->rx_ring[gq->cur];
+
+		if (--boguscnt <= 0)
+			break;
 	}
 
 	num = rswitch_get_num_cur_queues(gq);
@@ -745,7 +749,7 @@ static bool rswitch_rx(struct net_device *ndev, int *quota)
 		goto err;
 	gq->dirty = rswitch_next_queue_index(gq, false, num);
 
-	*quota -= limit - (++boguscnt);
+	*quota -= limit - boguscnt;
 
 	return boguscnt <= 0;
 
@@ -1437,7 +1441,10 @@ static int rswitch_open(struct net_device *ndev)
 	rswitch_enadis_data_irq(rdev->priv, rdev->tx_queue->index, true);
 	rswitch_enadis_data_irq(rdev->priv, rdev->rx_queue->index, true);
 
-	iowrite32(GWCA_TS_IRQ_BIT, rdev->priv->addr + GWTSDIE);
+	if (bitmap_empty(rdev->priv->opened_ports, RSWITCH_NUM_PORTS))
+		iowrite32(GWCA_TS_IRQ_BIT, rdev->priv->addr + GWTSDIE);
+
+	bitmap_set(rdev->priv->opened_ports, rdev->port, 1);
 
 	return 0;
 };
@@ -1448,8 +1455,10 @@ static int rswitch_stop(struct net_device *ndev)
 	struct rswitch_gwca_ts_info *ts_info, *ts_info2;
 
 	netif_tx_stop_all_queues(ndev);
+	bitmap_clear(rdev->priv->opened_ports, rdev->port, 1);
 
-	iowrite32(GWCA_TS_IRQ_BIT, rdev->priv->addr + GWTSDID);
+	if (bitmap_empty(rdev->priv->opened_ports, RSWITCH_NUM_PORTS))
+		iowrite32(GWCA_TS_IRQ_BIT, rdev->priv->addr + GWTSDID);
 
 	list_for_each_entry_safe(ts_info, ts_info2, &rdev->priv->gwca.ts_info_list, list) {
 		if (ts_info->port != rdev->port)

drivers/net/ethernet/renesas/rswitch.h

@@ -998,6 +998,7 @@ struct rswitch_private {
 	struct rcar_gen4_ptp_private *ptp_priv;
 
 	struct rswitch_device *rdev[RSWITCH_NUM_PORTS];
+	DECLARE_BITMAP(opened_ports, RSWITCH_NUM_PORTS);
 
 	struct rswitch_gwca gwca;
 	struct rswitch_etha etha[RSWITCH_NUM_PORTS];