[PATCH -next] r8169: add support for xmit_more
From: Florian Westphal <fw@strlen.de>
Date: 2015-01-07 09:49:53
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> --- drivers/net/ethernet/realtek/r8169.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 14a1c5c..3a28059 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c@@ -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); + + mmiowb(); + } - if (!TX_FRAGS_READY_FOR(tp, MAX_SKB_FRAGS)) { + if (stop_queue) { /* Avoid wrongly optimistic queue wake-up: rtl_tx thread must * not miss a ring update when it notices a stopped queue. */
--
2.0.5