[PATCH net-next] vmxnet3: turn off lro when rxcsum is disabled

[Ronak Doshi]

Currently, when rx csum is disabled, vmxnet3 driver does not turn
off lro, which can cause performance issues if user does not turn off
lro explicitly. This patch adds fix_features support which is used to
turn off LRO whenever RXCSUM is disabled.

Signed-off-by: Ronak Doshi <dos...@vmware.com>
Acked-by: Rishi Mehta <rme...@vmware.com>
---
 drivers/net/vmxnet3/vmxnet3_drv.c     |  1 +
 drivers/net/vmxnet3/vmxnet3_ethtool.c | 10 ++++++++++
 drivers/net/vmxnet3/vmxnet3_int.h     |  7 +++++--
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c 
b/drivers/net/vmxnet3/vmxnet3_drv.c
index 1b2a18ea855c..3f48f05dd2a6 100644
--- a/drivers/net/vmxnet3/vmxnet3_drv.c
+++ b/drivers/net/vmxnet3/vmxnet3_drv.c
@@ -3247,6 +3247,7 @@ vmxnet3_probe_device(struct pci_dev *pdev,
                .ndo_start_xmit = vmxnet3_xmit_frame,
                .ndo_set_mac_address = vmxnet3_set_mac_addr,
                .ndo_change_mtu = vmxnet3_change_mtu,
+               .ndo_fix_features = vmxnet3_fix_features,
                .ndo_set_features = vmxnet3_set_features,
                .ndo_get_stats64 = vmxnet3_get_stats64,
                .ndo_tx_timeout = vmxnet3_tx_timeout,
diff --git a/drivers/net/vmxnet3/vmxnet3_ethtool.c 
b/drivers/net/vmxnet3/vmxnet3_ethtool.c
index 559db051a500..0a38c76688ab 100644
--- a/drivers/net/vmxnet3/vmxnet3_ethtool.c
+++ b/drivers/net/vmxnet3/vmxnet3_ethtool.c
@@ -257,6 +257,16 @@ vmxnet3_get_strings(struct net_device *netdev, u32 
stringset, u8 *buf)
        }
 }
 
+netdev_features_t vmxnet3_fix_features(struct net_device *netdev,
+                                      netdev_features_t features)
+{
+       /* If Rx checksum is disabled, then LRO should also be disabled */
+       if (!(features & NETIF_F_RXCSUM))
+               features &= ~NETIF_F_LRO;
+
+       return features;
+}
+
 int vmxnet3_set_features(struct net_device *netdev, netdev_features_t features)
 {
        struct vmxnet3_adapter *adapter = netdev_priv(netdev);
diff --git a/drivers/net/vmxnet3/vmxnet3_int.h 
b/drivers/net/vmxnet3/vmxnet3_int.h
index a2c554f8a61b..1cc1cd4aaa59 100644
--- a/drivers/net/vmxnet3/vmxnet3_int.h
+++ b/drivers/net/vmxnet3/vmxnet3_int.h
@@ -69,12 +69,12 @@
 /*
  * Version numbers
  */
-#define VMXNET3_DRIVER_VERSION_STRING   "1.4.16.0-k"
+#define VMXNET3_DRIVER_VERSION_STRING   "1.4.17.0-k"
 
 /* Each byte of this 32-bit integer encodes a version number in
  * VMXNET3_DRIVER_VERSION_STRING.
  */
-#define VMXNET3_DRIVER_VERSION_NUM      0x01041000
+#define VMXNET3_DRIVER_VERSION_NUM      0x01041100
 
 #if defined(CONFIG_PCI_MSI)
        /* RSS only makes sense if MSI-X is supported. */
@@ -454,6 +454,9 @@ vmxnet3_tq_destroy_all(struct vmxnet3_adapter *adapter);
 void
 vmxnet3_rq_destroy_all(struct vmxnet3_adapter *adapter);
 
+netdev_features_t
+vmxnet3_fix_features(struct net_device *netdev, netdev_features_t features);
+
 int
 vmxnet3_set_features(struct net_device *netdev, netdev_features_t features);
 
-- 
2.11.0