[net 2/3] net: do not do gso for CHECKSUM_UNNECESSARY in netif_needs_gso

From: Yi Zou <redacted>

This is related to fixing the bug of dropping FCoE frames when disabling tx ip
checksum by 'ethtool -K ethx tx off'. The FCoE protocol stack driver would
use CHECKSUM_UNNECESSARY on tx path instead of CHECKSUM_PARTIAL (as indicated in
the 2/2 of this series). To do so, netif_needs_gso() has to be changed here to
not do gso for both CHECKSUM_PARTIAL and CHECKSUM_UNNECESSARY.

Ref. to original discussion thread:
http://patchwork.ozlabs.org/patch/146567/

Signed-off-by: Yi Zou <redacted>
Tested-by: Ross Brattain <redacted>
Signed-off-by: Jeff Kirsher <redacted>
---
 include/linux/netdevice.h |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 0eac07c..c1b2b5f 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h

@@ -2636,7 +2636,8 @@ static inline int netif_needs_gso(struct sk_buff *skb,
 	netdev_features_t features)
 {
 	return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
-		unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
+		unlikely((skb->ip_summed != CHECKSUM_PARTIAL) &&
+			 (skb->ip_summed != CHECKSUM_UNNECESSARY)));
 }
 
 static inline void netif_set_gso_max_size(struct net_device *dev,

-- 
1.7.7.6