netdev - [PATCH 2/2] ixgbe: support skb->xmit_more in netdev_ops->ndo_start

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Message-Id: <20140825.163505.1969688661687017343.davem@davemloft.net>
Date:	Mon, 25 Aug 2014 16:35:05 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	netdev@...r.kernel.org
Cc:	therbert@...gle.com, jhs@...atatu.com, hannes@...essinduktion.org,
	edumazet@...gle.com, jeffrey.t.kirsher@...el.com,
	rusty@...tcorp.com.au, dborkman@...hat.com, brouer@...hat.com
Subject: [PATCH 2/2] ixgbe: support skb->xmit_more in
 netdev_ops->ndo_start_xmit()


From: Daniel Borkmann <dborkman@...hat.com>

This implements the deferred tail pointer flush API for the ixgbe
driver. Similar version also proposed longer time ago by Alexander Duyck.

Signed-off-by: Daniel Borkmann <dborkman@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 87bd53f..ba9ceaa 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -6958,9 +6958,10 @@ static void ixgbe_tx_map(struct ixgbe_ring *tx_ring,
 
 	tx_ring->next_to_use = i;
 
-	/* notify HW of packet */
-	ixgbe_write_tail(tx_ring, i);
-
+	if (!skb->xmit_more) {
+		/* notify HW of packet */
+		ixgbe_write_tail(tx_ring, i);
+	}
 	return;
 dma_error:
 	dev_err(tx_ring->dev, "TX DMA map failed\n");
-- 
1.7.11.7

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