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ixgb: Maybe stop TX if not enough free descriptors 

A similar patch to commit 65c7973fa5
but now for ixgb.

Cc: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
This commit is contained in:
Jesse Brandeburg 2007-01-06 09:51:38 -08:00 committed by Auke Kok
parent 5d92785375
commit dfd341e4e4
3 changed files with 36 additions and 3 deletions
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1
drivers/net/ixgb/ixgb.h
View File

@ -171,6 +171,7 @@ struct ixgb_adapter {
/* TX */
struct ixgb_desc_ring tx_ring ____cacheline_aligned_in_smp;
unsigned int restart_queue;
unsigned long timeo_start;
uint32_t tx_cmd_type;
uint64_t hw_csum_tx_good;

1
drivers/net/ixgb/ixgb_ethtool.c
View File

@ -79,6 +79,7 @@ static struct ixgb_stats ixgb_gstrings_stats[] = {
{"tx_window_errors", IXGB_STAT(net_stats.tx_window_errors)},
{"tx_deferred_ok", IXGB_STAT(stats.dc)},
{"tx_timeout_count", IXGB_STAT(tx_timeout_count) },
{"tx_restart_queue", IXGB_STAT(restart_queue) },
{"rx_long_length_errors", IXGB_STAT(stats.roc)},
{"rx_short_length_errors", IXGB_STAT(stats.ruc)},
#ifdef NETIF_F_TSO

37
drivers/net/ixgb/ixgb_main.c
View File

@ -1411,6 +1411,37 @@ ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
IXGB_WRITE_REG(&adapter->hw, TDT, i);
}
static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
{
struct ixgb_adapter *adapter = netdev_priv(netdev);
struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
netif_stop_queue(netdev);
/* Herbert's original patch had:
* smp_mb__after_netif_stop_queue();
* but since that doesn't exist yet, just open code it. */
smp_mb();
/* We need to check again in a case another CPU has just
* made room available. */
if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
return -EBUSY;
/* A reprieve! */
netif_start_queue(netdev);
++adapter->restart_queue;
return 0;
}
static int ixgb_maybe_stop_tx(struct net_device *netdev,
struct ixgb_desc_ring *tx_ring, int size)
{
if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
return 0;
return __ixgb_maybe_stop_tx(netdev, size);
}
/* Tx Descriptors needed, worst case */
#define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
(((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
@ -1444,7 +1475,8 @@ ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
spin_lock_irqsave(&adapter->tx_lock, flags);
#endif
if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED)) {
if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
DESC_NEEDED))) {
netif_stop_queue(netdev);
spin_unlock_irqrestore(&adapter->tx_lock, flags);
return NETDEV_TX_BUSY;
@ -1482,8 +1514,7 @@ ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
#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);
ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
spin_unlock_irqrestore(&adapter->tx_lock, flags);