ixgb: add NETIF_F_LLTX analogous to e1000

add NETIF_F_LLTX code like e1000 has

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>

diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c
index 13181c4..466cbe2 100644 (file)
--- a/drivers/net/ixgb/ixgb_main.c
+++ b/drivers/net/ixgb/ixgb_main.c
@@ -449,6 +449,9 @@ ixgb_probe(struct pci_dev *pdev,
 #ifdef NETIF_F_TSO
        netdev->features |= NETIF_F_TSO;
 #endif
+#ifdef NETIF_F_LLTX
+       netdev->features |= NETIF_F_LLTX;
+#endif
 
        if(pci_using_dac)
                netdev->features |= NETIF_F_HIGHDMA;
@@ -1408,13 +1411,26 @@ ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
                return 0;
        }
 
+#ifdef NETIF_F_LLTX
+       local_irq_save(flags);
+       if (!spin_trylock(&adapter->tx_lock)) {
+               /* Collision - tell upper layer to requeue */
+               local_irq_restore(flags);
+               return NETDEV_TX_LOCKED;
+       }
+#else
        spin_lock_irqsave(&adapter->tx_lock, flags);
+#endif
+
        if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED)) {
                netif_stop_queue(netdev);
                spin_unlock_irqrestore(&adapter->tx_lock, flags);
-               return 1;
+               return NETDEV_TX_BUSY;
        }
+
+#ifndef NETIF_F_LLTX
        spin_unlock_irqrestore(&adapter->tx_lock, flags);
+#endif
 
        if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
                tx_flags |= IXGB_TX_FLAGS_VLAN;
@@ -1426,6 +1442,9 @@ ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
        tso = ixgb_tso(adapter, skb);
        if (tso < 0) {
                dev_kfree_skb_any(skb);
+#ifdef NETIF_F_LLTX
+               spin_unlock_irqrestore(&adapter->tx_lock, flags);
+#endif
                return NETDEV_TX_OK;
        }
 
@@ -1439,7 +1458,15 @@ ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
 
        netdev->trans_start = jiffies;
 
-       return 0;
+#ifdef NETIF_F_LLTX
+       /* Make sure there is space in the ring for the next send. */
+       if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED))
+               netif_stop_queue(netdev);
+
+       spin_unlock_irqrestore(&adapter->tx_lock, flags);
+
+#endif
+       return NETDEV_TX_OK;
 }
 
 /**