netdev - [PATCH net-next 20/40] net: fec: detect tx int lost

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Date:	Thu, 28 Jan 2016 14:25:44 -0700
From:	Troy Kisky <troy.kisky@...ndarydevices.com>
To:	netdev@...r.kernel.org, davem@...emloft.net, B38611@...escale.com
Cc:	fabio.estevam@...escale.com, l.stach@...gutronix.de,
	andrew@...n.ch, tremyfr@...il.com, linux@....linux.org.uk,
	linux-arm-kernel@...ts.infradead.org, laci@...ndarydevices.com,
	shawnguo@...nel.org, Troy Kisky <troy.kisky@...ndarydevices.com>
Subject: [PATCH net-next 20/40] net: fec: detect tx int lost

If a tx int is lost, no need to reset
the fec. Just mark the event and call napi_schedule.

Signed-off-by: Troy Kisky <troy.kisky@...ndarydevices.com>
---
 drivers/net/ethernet/freescale/fec_main.c | 36 ++++++++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 1225282..47df66e 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -1091,14 +1091,48 @@ fec_stop(struct net_device *ndev)
 	}
 }
 
+uint txint_flags[] = {FEC_ENET_TXF_0, FEC_ENET_TXF_1, FEC_ENET_TXF_2};
 
 static void
 fec_timeout(struct net_device *ndev)
 {
 	struct fec_enet_private *fep = netdev_priv(ndev);
+	struct bufdesc *bdp;
+	unsigned short status;
+	int i;
+	uint events = 0;
 
-	fec_dump(ndev);
+	for (i = 0; i < fep->num_tx_queues; i++) {
+		struct fec_enet_priv_tx_q *txq = fep->tx_queue[i];
+		int index;
+		struct sk_buff *skb = NULL;
+
+		bdp = txq->dirty_tx;
+		while (1) {
+			bdp = fec_enet_get_nextdesc(bdp, &txq->bd);
+			if (bdp == txq->bd.cur)
+				break;
+			index = fec_enet_get_bd_index(bdp, &txq->bd);
+			skb = txq->tx_skbuff[index];
+			if (skb) {
+				status = bdp->cbd_sc;
+				if ((status & BD_ENET_TX_READY) == 0)
+					events |= txint_flags[i];
+				break;
+			}
+		}
+	}
+	if (events) {
+		fep->events |= events;
+		/* Disable the RX/TX interrupt */
+		writel(FEC_NAPI_IMASK, fep->hwp + FEC_IMASK);
+		napi_schedule(&fep->napi);
+		netif_wake_queue(fep->netdev);
+		pr_err("%s: tx int lost\n", __func__);
+		return;
+	}
 
+	fec_dump(ndev);
 	ndev->stats.tx_errors++;
 
 	schedule_work(&fep->tx_timeout_work);
-- 
2.5.0