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authorEric Dumazet <eric.dumazet@gmail.com>2009-09-30 13:03:33 +0000
committerDavid S. Miller <davem@davemloft.net>2009-10-05 00:21:54 -0700
commit0835acfe72e43b2f9bd46ec8c0d219e94c3525e0 (patch)
treefba23c6f67d2b6c42e70c02bf4b7a4bf25dbc103 /net/core
parentb3a5b6cc7cab89dcc3301add750f88019d910a2b (diff)
pktgen: Avoid dirtying skb->users when txq is full
We can avoid two atomic ops on skb->users if packet is not going to be sent to the device (because hardware txqueue is full) Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/pktgen.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index b69455217ed..e856ab0d074 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -3441,12 +3441,14 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
txq = netdev_get_tx_queue(odev, queue_map);
__netif_tx_lock_bh(txq);
- atomic_inc(&(pkt_dev->skb->users));
- if (unlikely(netif_tx_queue_stopped(txq) || netif_tx_queue_frozen(txq)))
+ if (unlikely(netif_tx_queue_stopped(txq) || netif_tx_queue_frozen(txq))) {
ret = NETDEV_TX_BUSY;
- else
- ret = (*xmit)(pkt_dev->skb, odev);
+ pkt_dev->last_ok = 0;
+ goto unlock;
+ }
+ atomic_inc(&(pkt_dev->skb->users));
+ ret = (*xmit)(pkt_dev->skb, odev);
switch (ret) {
case NETDEV_TX_OK:
@@ -3468,6 +3470,7 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
atomic_dec(&(pkt_dev->skb->users));
pkt_dev->last_ok = 0;
}
+unlock:
__netif_tx_unlock_bh(txq);
/* If pkt_dev->count is zero, then run forever */