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Commit f10b09ef authored by Thomas Falcon's avatar Thomas Falcon Committed by David S. Miller
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ibmvnic: Handle TSO backing device errata 



TSO packets with one segment or with an MSS less than 224 can
cause errors on some backing devices, so disable GSO in those cases.

Signed-off-by: default avatarThomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 1f247a6f

drivers/net/ethernet/ibm/ibmvnic.c

+18 −0
Original line number Diff line number Diff line
@@ -2049,6 +2049,23 @@ static int ibmvnic_change_mtu(struct net_device *netdev, int new_mtu) 
	return wait_for_reset(adapter);

}



static netdev_features_t ibmvnic_features_check(struct sk_buff *skb,

						struct net_device *dev,

						netdev_features_t features)

{

	/* Some backing hardware adapters can not

	 * handle packets with a MSS less than 224

	 * or with only one segment.

	 */

	if (skb_is_gso(skb)) {

		if (skb_shinfo(skb)->gso_size < 224 ||

		    skb_shinfo(skb)->gso_segs == 1)

			features &= ~NETIF_F_GSO_MASK;

	}



	return features;

}



static const struct net_device_ops ibmvnic_netdev_ops = {

	.ndo_open		= ibmvnic_open,

	.ndo_stop		= ibmvnic_close,
@@ -2061,6 +2078,7 @@ static const struct net_device_ops ibmvnic_netdev_ops = { 
	.ndo_poll_controller	= ibmvnic_netpoll_controller,

#endif

	.ndo_change_mtu		= ibmvnic_change_mtu,

	.ndo_features_check     = ibmvnic_features_check,

};



/* ethtool functions */