net: fec: only clear a queue's work bit if the queue was emptied

[ Upstream commit 1c021bb717a70aaeaa4b25c91f43c2aeddd922de ]

In the receive path a queue's work bit was cleared unconditionally even
if fec_enet_rx_queue only read out a part of the available packets from
the hardware. This resulted in not reading any packets in the next napi
turn and so packets were delayed or lost.

The obvious fix is to only clear a queue's bit when the queue was
emptied.

Fixes: 4d494cdc92b3 ("net: fec: change data structure to support multiqueue")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Tested-by: Fugang Duan <fugang.duan@nxp.com>
Acked-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index b2a32209ffbfc2806d725d7924b470d2752e03d5..f6147ffc7fbca76f4f6f512caa9e9612a32cf00a 100644 (file)
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -1557,9 +1557,15 @@ fec_enet_rx(struct net_device *ndev, int budget)
        struct fec_enet_private *fep = netdev_priv(ndev);
 
        for_each_set_bit(queue_id, &fep->work_rx, FEC_ENET_MAX_RX_QS) {
-               clear_bit(queue_id, &fep->work_rx);
-               pkt_received += fec_enet_rx_queue(ndev,
+               int ret;
+
+               ret = fec_enet_rx_queue(ndev,
                                        budget - pkt_received, queue_id);
+
+               if (ret < budget - pkt_received)
+                       clear_bit(queue_id, &fep->work_rx);
+
+               pkt_received += ret;
        }
        return pkt_received;
 }