net: do not do gso for CHECKSUM_UNNECESSARY in netif_needs_gso
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 <yi.zou@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 4535a4e..261067b 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2657,7 +2657,8 @@
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,