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authorDavid Daney <ddaney@caviumnetworks.com>2010-05-05 13:03:12 +0000
committerDavid S. Miller <davem@davemloft.net>2010-05-05 21:22:35 -0700
commit4e4a4f1478fdb303c9d99c69cfb4e973526f0c99 (patch)
treea5b6a62d6743b1df1074e01d35b054471a688b6a /drivers/net/octeon
parentb635e06993076c3c8f8cc766b183be7da3baafdb (diff)
netdev: octeon_mgmt: Try not to drop TX packets when stopping the queue.
Stop the queue when we add the packet that will fill it instead of dropping the packet Signed-off-by: David Daney <ddaney@caviumnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/octeon')
-rw-r--r--drivers/net/octeon/octeon_mgmt.c16
1 files changed, 11 insertions, 5 deletions
diff --git a/drivers/net/octeon/octeon_mgmt.c b/drivers/net/octeon/octeon_mgmt.c
index 3cf6f62502c8..1fdc7b303a6b 100644
--- a/drivers/net/octeon/octeon_mgmt.c
+++ b/drivers/net/octeon/octeon_mgmt.c
@@ -955,6 +955,7 @@ static int octeon_mgmt_xmit(struct sk_buff *skb, struct net_device *netdev)
int port = p->port;
union mgmt_port_ring_entry re;
unsigned long flags;
+ int rv = NETDEV_TX_BUSY;
re.d64 = 0;
re.s.len = skb->len;
@@ -964,15 +965,18 @@ static int octeon_mgmt_xmit(struct sk_buff *skb, struct net_device *netdev)
spin_lock_irqsave(&p->tx_list.lock, flags);
+ if (unlikely(p->tx_current_fill >= ring_max_fill(OCTEON_MGMT_TX_RING_SIZE) - 1)) {
+ spin_unlock_irqrestore(&p->tx_list.lock, flags);
+ netif_stop_queue(netdev);
+ spin_lock_irqsave(&p->tx_list.lock, flags);
+ }
+
if (unlikely(p->tx_current_fill >=
ring_max_fill(OCTEON_MGMT_TX_RING_SIZE))) {
spin_unlock_irqrestore(&p->tx_list.lock, flags);
-
dma_unmap_single(p->dev, re.s.addr, re.s.len,
DMA_TO_DEVICE);
-
- netif_stop_queue(netdev);
- return NETDEV_TX_BUSY;
+ goto out;
}
__skb_queue_tail(&p->tx_list, skb);
@@ -995,8 +999,10 @@ static int octeon_mgmt_xmit(struct sk_buff *skb, struct net_device *netdev)
cvmx_write_csr(CVMX_MIXX_ORING2(port), 1);
netdev->trans_start = jiffies;
+ rv = NETDEV_TX_OK;
+out:
octeon_mgmt_update_tx_stats(netdev);
- return NETDEV_TX_OK;
+ return rv;
}
#ifdef CONFIG_NET_POLL_CONTROLLER

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