igb: Support netdev_ops->ndo_xmit_flush()

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

1 files changed, 24 insertions, 11 deletions

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index cb14bbdfb056..b9c020a05fb8 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -136,6 +136,7 @@ static void igb_update_phy_info(unsigned long);
 static void igb_watchdog(unsigned long);
 static void igb_watchdog_task(struct work_struct *);
 static netdev_tx_t igb_xmit_frame(struct sk_buff *skb, struct net_device *);
+static void igb_xmit_flush(struct net_device *netdev, u16 queue);
 static struct rtnl_link_stats64 *igb_get_stats64(struct net_device *dev,
                                           struct rtnl_link_stats64 *stats);
 static int igb_change_mtu(struct net_device *, int);
@@ -2075,6 +2076,7 @@ static const struct net_device_ops igb_netdev_ops = {
         .ndo_open               = igb_open,
         .ndo_stop               = igb_close,
         .ndo_start_xmit         = igb_xmit_frame,
+        .ndo_xmit_flush         = igb_xmit_flush,
         .ndo_get_stats64        = igb_get_stats64,
         .ndo_set_rx_mode        = igb_set_rx_mode,
         .ndo_set_mac_address    = igb_set_mac,
@@ -4915,13 +4917,6 @@ static void igb_tx_map(struct igb_ring *tx_ring,
 
         tx_ring->next_to_use = i;
 
-        writel(i, tx_ring->tail);
-
-        /* we need this if more than one processor can write to our tail
-         * at a time, it synchronizes IO on IA64/Altix systems
-         */
-        mmiowb();
-
         return;
 
 dma_error:
@@ -5057,17 +5052,20 @@ out_drop:
         return NETDEV_TX_OK;
 }
 
-static inline struct igb_ring *igb_tx_queue_mapping(struct igb_adapter *adapter,
-                                                    struct sk_buff *skb)
+static struct igb_ring *__igb_tx_queue_mapping(struct igb_adapter *adapter, unsigned int r_idx)
 {
-        unsigned int r_idx = skb->queue_mapping;
-
         if (r_idx >= adapter->num_tx_queues)
                 r_idx = r_idx % adapter->num_tx_queues;
 
         return adapter->tx_ring[r_idx];
 }
 
+static inline struct igb_ring *igb_tx_queue_mapping(struct igb_adapter *adapter,
+                                                    struct sk_buff *skb)
+{
+        return __igb_tx_queue_mapping(adapter, skb->queue_mapping);
+}
+
 static netdev_tx_t igb_xmit_frame(struct sk_buff *skb,
                                   struct net_device *netdev)
 {
@@ -5096,6 +5094,21 @@ static netdev_tx_t igb_xmit_frame(struct sk_buff *skb,
         return igb_xmit_frame_ring(skb, igb_tx_queue_mapping(adapter, skb));
 }
 
+static void igb_xmit_flush(struct net_device *netdev, u16 queue)
+{
+        struct igb_adapter *adapter = netdev_priv(netdev);
+        struct igb_ring *tx_ring;
+
+        tx_ring = __igb_tx_queue_mapping(adapter, queue);
+
+        writel(tx_ring->next_to_use, tx_ring->tail);
+
+        /* we need this if more than one processor can write to our tail
+         * at a time, it synchronizes IO on IA64/Altix systems
+         */
+        mmiowb();
+}
+
 /**
  *  igb_tx_timeout - Respond to a Tx Hang
  *  @netdev: network interface device structure