From b60a416b7ed9e13881aa64d700cba8657944cd37 Mon Sep 17 00:00:00 2001
From: Florian Westphal <fw@strlen.de>
Date: Wed, 7 Jan 2015 10:49:49 +0100
Subject: [PATCH] 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>
---
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 14a1c5cec3a59..3a280598a15a1 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.
*/
--
2.39.5