linux-kernel - [PATCH 3.16 17/55] net: fix checksum features handling in netif_skb

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Date:	Mon, 13 Oct 2014 04:24:31 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Michal Kubecek <mkubecek@...e.cz>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.16 17/55] net: fix checksum features handling in netif_skb_features()

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: =?UTF-8?q?Michal=20Kube=C4=8Dek?= <mkubecek@...e.cz>

[ Upstream commit db115037bb57cdfe97078b13da762213f7980e81 ]

This is follow-up to

  da08143b8520 ("vlan: more careful checksum features handling")

which introduced more careful feature intersection in vlan code,
taking into account that HW_CSUM should be considered superset
of IP_CSUM/IPV6_CSUM. The same is needed in netif_skb_features()
in order to avoid offloading mismatch warning when vlan is
created on top of a bond consisting of slaves supporting IP/IPv6
checksumming but not vlan Tx offloading.

Signed-off-by: Michal Kubecek <mkubecek@...e.cz>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/core/dev.c |   16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2576,13 +2576,19 @@ netdev_features_t netif_skb_features(str
 		return harmonize_features(skb, features);
 	}
 
-	features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_CTAG_TX |
-					       NETIF_F_HW_VLAN_STAG_TX);
+	features = netdev_intersect_features(features,
+					     skb->dev->vlan_features |
+					     NETIF_F_HW_VLAN_CTAG_TX |
+					     NETIF_F_HW_VLAN_STAG_TX);
 
 	if (protocol == htons(ETH_P_8021Q) || protocol == htons(ETH_P_8021AD))
-		features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
-				NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_CTAG_TX |
-				NETIF_F_HW_VLAN_STAG_TX;
+		features = netdev_intersect_features(features,
+						     NETIF_F_SG |
+						     NETIF_F_HIGHDMA |
+						     NETIF_F_FRAGLIST |
+						     NETIF_F_GEN_CSUM |
+						     NETIF_F_HW_VLAN_CTAG_TX |
+						     NETIF_F_HW_VLAN_STAG_TX);
 
 	return harmonize_features(skb, features);
 }


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