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tg3: Add skb->xmit_more support 

Ring TX doorbell only if xmit_more is not set or the queue is stopped.

Suggested-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Prashant Sreedharan <prashant@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Prashant Sreedharan 2014-10-13 09:21:42 -07:00 committed by David S. Miller
parent f76936d07c
commit 2c7c9ea429
1 changed files with 6 additions and 4 deletions
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10
drivers/net/ethernet/broadcom/tg3.c
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@ -8099,9 +8099,6 @@ static netdev_tx_t tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
/* Sync BD data before updating mailbox */
wmb();
/* Packets are ready, update Tx producer idx local and on card. */
tw32_tx_mbox(tnapi->prodmbox, entry);
tnapi->tx_prod = entry;
if (unlikely(tg3_tx_avail(tnapi) <= (MAX_SKB_FRAGS + 1))) {
netif_tx_stop_queue(txq);
@ -8116,7 +8113,12 @@ static netdev_tx_t tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
netif_tx_wake_queue(txq);
}
mmiowb();
if (!skb->xmit_more || netif_xmit_stopped(txq)) {
/* Packets are ready, update Tx producer idx on card. */
tw32_tx_mbox(tnapi->prodmbox, entry);
mmiowb();
}
return NETDEV_TX_OK;
dma_error: