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: Thomas Falcon <tlfal...@linux.vnet.ibm.com>
---
drivers/net/ethernet/ibm/ibmvnic.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c
b/drivers/net/ethernet/ibm/ibmvnic.c
index 7ed87fb..e02d3b9 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -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 */
--
2.7.5
