netdev - [PATCH v2.42 4/5] datapath: Break out deacceleration portion of vlan

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Message-Id: <1380874200-8981-5-git-send-email-horms@verge.net.au>
Date:	Fri,  4 Oct 2013 17:09:59 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	dev@...nvswitch.org, netdev@...r.kernel.org,
	Jesse Gross <jesse@...ira.com>, Ben Pfaff <blp@...ira.com>
Cc:	Pravin B Shelar <pshelar@...ira.com>, Ravi K <rkerur@...il.com>,
	Isaku Yamahata <yamahata@...inux.co.jp>,
	Joe Stringer <joe@...d.net.nz>
Subject: [PATCH v2.42 4/5] datapath: Break out deacceleration portion of vlan_push

Break out deacceleration portion of vlan_push into vlan_put
so that it may be re-used by mpls_push.

For both vlan_push and mpls_push if there is an accelerated VLAN tag
present then it should be deaccelerated, adding it to the data of
the skb, before the new tag is added.

Signed-off-by: Simon Horman <horms@...ge.net.au>

---
v2.40
* As suggested by Jesse Gross
  + Simplify vlan_push by returning an error code
    rather than an error code encoded as a struct xkb_buff *

v2.39
* First post
---
 datapath/actions.c | 29 +++++++++++++++++++----------
 1 file changed, 19 insertions(+), 10 deletions(-)

diff --git a/datapath/actions.c b/datapath/actions.c
index 30ea1d2..d961e5d 100644
--- a/datapath/actions.c
+++ b/datapath/actions.c
@@ -105,22 +105,31 @@ static int pop_vlan(struct sk_buff *skb)
 	return 0;
 }
 
-static int push_vlan(struct sk_buff *skb, const struct ovs_action_push_vlan *vlan)
+/* push down current VLAN tag */
+static int put_vlan(struct sk_buff *skb)
 {
-	if (unlikely(vlan_tx_tag_present(skb))) {
-		u16 current_tag;
+	u16 current_tag = vlan_tx_tag_get(skb);
 
-		/* push down current VLAN tag */
-		current_tag = vlan_tx_tag_get(skb);
+	if (!__vlan_put_tag(skb, skb->vlan_proto, current_tag))
+		return -ENOMEM;
 
-		if (!__vlan_put_tag(skb, skb->vlan_proto, current_tag))
-			return -ENOMEM;
+	if (skb->ip_summed == CHECKSUM_COMPLETE)
+		skb->csum = csum_add(skb->csum, csum_partial(skb->data
+				+ (2 * ETH_ALEN), VLAN_HLEN, 0));
 
-		if (skb->ip_summed == CHECKSUM_COMPLETE)
-			skb->csum = csum_add(skb->csum, csum_partial(skb->data
-					+ (2 * ETH_ALEN), VLAN_HLEN, 0));
+	return 0;
+}
 
+static int push_vlan(struct sk_buff *skb, const struct ovs_action_push_vlan *vlan)
+{
+	if (unlikely(vlan_tx_tag_present(skb))) {
+		int err;
+
+		err = put_vlan(skb);
+		if (unlikely(err))
+			return err;
 	}
+
 	__vlan_hwaccel_put_tag(skb, vlan->vlan_tpid, ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT);
 	return 0;
 }
-- 
1.8.4

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