netdev - [PATCH net-next 2/2] net: bcmgenet: add support for xmit

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Message-Id: <1425937937-26955-3-git-send-email-f.fainelli@gmail.com>
Date:	Mon,  9 Mar 2015 14:52:17 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, pgynther@...gle.com, jaedon.shin@...il.com,
	Florian Fainelli <f.fainelli@...il.com>
Subject: [PATCH net-next 2/2] net: bcmgenet: add support for xmit_more

Delay the update of the TDMA producer index unless this is the last SKB in a
batch, or the queue is already stopped.

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/net/ethernet/broadcom/genet/bcmgenet.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index 9b3b8a3db59b..8419826da6a7 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -1316,8 +1316,10 @@ static netdev_tx_t bcmgenet_xmit(struct sk_buff *skb, struct net_device *dev)
 	ring->prod_index += nr_frags + 1;
 	ring->prod_index &= DMA_P_INDEX_MASK;
 
-	bcmgenet_tdma_ring_writel(priv, ring->index,
-				  ring->prod_index, TDMA_PROD_INDEX);
+	if (!skb->xmit_more || netif_xmit_stopped(txq))
+		/* Packets are ready, update producer index */
+		bcmgenet_tdma_ring_writel(priv, ring->index,
+					  ring->prod_index, TDMA_PROD_INDEX);
 
 	if (ring->free_bds <= (MAX_SKB_FRAGS + 1))
 		netif_tx_stop_queue(txq);
-- 
2.1.0

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