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r8169: add support for xmit_more 

Delay update of hw tail descriptor if we know that another skb is going
to be sent.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2015-01-07 10:49:49 +01:00 committed by David S. Miller
parent 4a71d0548c
commit 0bec3b700d
1 changed files with 9 additions and 3 deletions
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12
drivers/net/ethernet/realtek/r8169.c
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@ -7049,6 +7049,7 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
u32 status, len;
u32 opts[2];
int frags;
bool stop_queue;
if (unlikely(!TX_FRAGS_READY_FOR(tp, skb_shinfo(skb)->nr_frags))) {
netif_err(tp, drv, dev, "BUG! Tx Ring full when queue awake!\n");
@ -7105,11 +7106,16 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
tp->cur_tx += frags + 1;
RTL_W8(TxPoll, NPQ);
stop_queue = !TX_FRAGS_READY_FOR(tp, MAX_SKB_FRAGS);
mmiowb();
if (!skb->xmit_more || stop_queue ||
netif_xmit_stopped(netdev_get_tx_queue(dev, 0))) {
RTL_W8(TxPoll, NPQ);
if (!TX_FRAGS_READY_FOR(tp, MAX_SKB_FRAGS)) {
mmiowb();
}
if (stop_queue) {
/* Avoid wrongly optimistic queue wake-up: rtl_tx thread must
* not miss a ring update when it notices a stopped queue.
*/