netdev - [PATCH 10/15] ehea: Simplify type 3 transmit routine

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Date:	Fri, 14 Oct 2011 12:31:07 -0300
From:	Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
To:	netdev@...r.kernel.org
Cc:	Anton Blanchard <anton@...ba.org>,
	Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
Subject: [PATCH 10/15] ehea: Simplify type 3 transmit routine

From: Anton Blanchard <anton@...ba.org>

If a nonlinear skb fits within the immediate area, use skb_copy_bits
instead of copying the frags by hand.

v3:
[cascardo] fixed conflict with use of skb frag API

Signed-off-by: Anton Blanchard <anton@...ba.org>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
---
 drivers/net/ethernet/ibm/ehea/ehea_main.c |   19 +++----------------
 1 files changed, 3 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ehea/ehea_main.c b/drivers/net/ethernet/ibm/ehea/ehea_main.c
index 0fc0ae8..289ad4d 100644
--- a/drivers/net/ethernet/ibm/ehea/ehea_main.c
+++ b/drivers/net/ethernet/ibm/ehea/ehea_main.c
@@ -2087,27 +2087,14 @@ static void ehea_xmit2(struct sk_buff *skb, struct net_device *dev,
 static void ehea_xmit3(struct sk_buff *skb, struct net_device *dev,
 		       struct ehea_swqe *swqe)
 {
-	int nfrags = skb_shinfo(skb)->nr_frags;
 	u8 *imm_data = &swqe->u.immdata_nodesc.immediate_data[0];
-	skb_frag_t *frag;
-	int i;
 
 	xmit_common(skb, swqe);
 
-	if (nfrags == 0) {
+	if (!skb->data_len)
 		skb_copy_from_linear_data(skb, imm_data, skb->len);
-	} else {
-		skb_copy_from_linear_data(skb, imm_data,
-					  skb_headlen(skb));
-		imm_data += skb_headlen(skb);
-
-		/* ... then copy data from the fragments */
-		for (i = 0; i < nfrags; i++) {
-			frag = &skb_shinfo(skb)->frags[i];
-			memcpy(imm_data, skb_frag_address(frag), frag->size);
-			imm_data += frag->size;
-		}
-	}
+	else
+		skb_copy_bits(skb, 0, imm_data, skb->len);
 
 	swqe->immediate_data_length = skb->len;
 	dev_kfree_skb(skb);
-- 
1.7.4.4

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