ixgb: remove lltx support and update tx routine
a) kernel developers suggest LLTX is broken and unsafe to use, remove it.
b) remember to pre-stop the queue if we won't have room
c) removing lltx means we can remove our tx lock
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c
index 79082eb..bd08e19 100644
--- a/drivers/net/ixgb/ixgb_main.c
+++ b/drivers/net/ixgb/ixgb_main.c
@@ -448,9 +448,6 @@
NETIF_F_HW_VLAN_RX |
NETIF_F_HW_VLAN_FILTER;
netdev->features |= NETIF_F_TSO;
-#ifdef NETIF_F_LLTX
- netdev->features |= NETIF_F_LLTX;
-#endif
if(pci_using_dac)
netdev->features |= NETIF_F_HIGHDMA;
@@ -577,8 +574,6 @@
/* enable flow control to be programmed */
hw->fc.send_xon = 1;
- spin_lock_init(&adapter->tx_lock);
-
set_bit(__IXGB_DOWN, &adapter->flags);
return 0;
}
@@ -1441,7 +1436,6 @@
struct ixgb_adapter *adapter = netdev_priv(netdev);
unsigned int first;
unsigned int tx_flags = 0;
- unsigned long flags;
int vlan_id = 0;
int tso;
@@ -1455,26 +1449,9 @@
return 0;
}
-#ifdef NETIF_F_LLTX
- if (!spin_trylock_irqsave(&adapter->tx_lock, flags)) {
- /* 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_maybe_stop_tx(netdev, &adapter->tx_ring,
- DESC_NEEDED))) {
- netif_stop_queue(netdev);
- spin_unlock_irqrestore(&adapter->tx_lock, flags);
+ DESC_NEEDED)))
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;
@@ -1486,9 +1463,6 @@
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;
}
@@ -1502,13 +1476,9 @@
netdev->trans_start = jiffies;
-#ifdef NETIF_F_LLTX
/* Make sure there is space in the ring for the next send. */
ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
- spin_unlock_irqrestore(&adapter->tx_lock, flags);
-
-#endif
return NETDEV_TX_OK;
}