netdev - [PATCH 06/10] GRETH: GBit transmit descriptor handling optimization

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Message-Id: <1294907135-24884-6-git-send-email-daniel@gaisler.com>
Date:	Thu, 13 Jan 2011 09:25:31 +0100
From:	Daniel Hellstrom <daniel@...sler.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, kristoffer@...sler.com
Subject: [PATCH 06/10] GRETH: GBit transmit descriptor handling optimization

It is safe to enable all fragments before enabling the first descriptor,
this way all descriptors don't have to be processed twice, added extra
memory barrier.

Signed-off-by: Daniel Hellstrom <daniel@...sler.com>
---
 drivers/net/greth.c |   19 ++++++++++---------
 1 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/net/greth.c b/drivers/net/greth.c
index 27578c9..72a4317 100644
--- a/drivers/net/greth.c
+++ b/drivers/net/greth.c
@@ -513,7 +513,7 @@ greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
 		greth->tx_skbuff[curr_tx] = NULL;
 		bdp = greth->tx_bd_base + curr_tx;
 
-		status = GRETH_TXBD_CSALL;
+		status = GRETH_TXBD_CSALL | GRETH_BD_EN;
 		status |= frag->size & GRETH_BD_LEN;
 
 		/* Wrap around descriptor ring */
@@ -550,26 +550,27 @@ greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
 
 	wmb();
 
-	/* Enable the descriptors that we configured ...  */
-	for (i = 0; i < nr_frags + 1; i++) {
-		bdp = greth->tx_bd_base + greth->tx_next;
-		greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
-		greth->tx_next = NEXT_TX(greth->tx_next);
-		greth->tx_free--;
-	}
+	/* Enable the descriptor chain by enabling the first descriptor */
+	bdp = greth->tx_bd_base + greth->tx_next;
+	greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
+	greth->tx_next = curr_tx;
+	greth->tx_free -= nr_frags + 1;
+
+	wmb();
 
 	greth_enable_tx(greth);
 
 	return NETDEV_TX_OK;
 
 frag_map_error:
-	/* Unmap SKB mappings that succeeded */
+	/* Unmap SKB mappings that succeeded and disable descriptor */
 	for (i = 0; greth->tx_next + i != curr_tx; i++) {
 		bdp = greth->tx_bd_base + greth->tx_next + i;
 		dma_unmap_single(greth->dev,
 				 greth_read_bd(&bdp->addr),
 				 greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
 				 DMA_TO_DEVICE);
+		greth_write_bd(&bdp->stat, 0);
 	}
 map_error:
 	if (net_ratelimit())
-- 
1.5.4

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