From: Heiner Kallweit <hkallweit1@gmail.com>
Date: Sun, 25 Nov 2018 13:31:54 +0000 (+0100)
Subject: r8169: make use of xmit_more and __netdev_sent_queue
X-Git-Tag: v5.0-rc1~129^2~212^2
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=2e6eedb4813e34d8d84ac0eb3afb668966f3f356;p=linux.git

r8169: make use of xmit_more and __netdev_sent_queue

Make use of xmit_more and add the functionality introduced with
3e59020abf0f ("net: bql: add __netdev_tx_sent_queue()").
I used the mlx4 driver as template.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 12811f18c134..3624e67aef72 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -6069,6 +6069,7 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
 	struct device *d = tp_to_dev(tp);
 	dma_addr_t mapping;
 	u32 opts[2], len;
+	bool stop_queue;
 	int frags;
 
 	if (unlikely(!rtl_tx_slots_avail(tp, skb_shinfo(skb)->nr_frags))) {
@@ -6110,8 +6111,6 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
 
 	txd->opts2 = cpu_to_le32(opts[1]);
 
-	netdev_sent_queue(dev, skb->len);
-
 	skb_tx_timestamp(skb);
 
 	/* Force memory writes to complete before releasing descriptor */
@@ -6124,16 +6123,16 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
 
 	tp->cur_tx += frags + 1;
 
-	RTL_W8(tp, TxPoll, NPQ);
+	stop_queue = !rtl_tx_slots_avail(tp, MAX_SKB_FRAGS);
+	if (unlikely(stop_queue))
+		netif_stop_queue(dev);
 
-	mmiowb();
+	if (__netdev_sent_queue(dev, skb->len, skb->xmit_more)) {
+		RTL_W8(tp, TxPoll, NPQ);
+		mmiowb();
+	}
 
-	if (!rtl_tx_slots_avail(tp, MAX_SKB_FRAGS)) {
-		/* Avoid wrongly optimistic queue wake-up: rtl_tx thread must
-		 * not miss a ring update when it notices a stopped queue.
-		 */
-		smp_wmb();
-		netif_stop_queue(dev);
+	if (unlikely(stop_queue)) {
 		/* Sync with rtl_tx:
 		 * - publish queue status and cur_tx ring index (write barrier)
 		 * - refresh dirty_tx ring index (read barrier).