path: root/drivers
diff options
authorThomas Jarosch <thomas.jarosch@intra2net.com>2011-05-16 06:28:15 +0000
committerGreg Kroah-Hartman <gregkh@suse.de>2011-05-21 15:13:34 -0700
commit67de934b0b0c242cb95ce97c78fc6e0ca4e904f7 (patch)
tree47ef53d131d25ac301aed53e0cb0afa5824e63d0 /drivers
parent9f5cc5c89537184cf45a7e069330c85428a7fc09 (diff)
vmxnet3: Fix inconsistent LRO state after initialization
commit ebde6f8acba92abfc203585198a54f47e83e2cd0 upstream. During initialization of vmxnet3, the state of LRO gets out of sync with netdev->features. This leads to very poor TCP performance in a IP forwarding setup and is hitting many VMware users. Simplified call sequence: 1. vmxnet3_declare_features() initializes "adapter->lro" to true. 2. The kernel automatically disables LRO if IP forwarding is enabled, so vmxnet3_set_flags() gets called. This also updates netdev->features. 3. Now vmxnet3_setup_driver_shared() is called. "adapter->lro" is still set to true and LRO gets enabled again, even though netdev->features shows it's disabled. Fix it by updating "adapter->lro", too. The private vmxnet3 adapter flags are scheduled for removal in net-next, see commit a0d2730c9571aeba793cb5d3009094ee1d8fda35 "net: vmxnet3: convert to hw_features". Patch applies to 2.6.37 / 2.6.38 and 2.6.39-rc6. Please CC: comments. Signed-off-by: Thomas Jarosch <thomas.jarosch@intra2net.com> Acked-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/vmxnet3/vmxnet3_ethtool.c b/drivers/net/vmxnet3/vmxnet3_ethtool.c
index 51f2ef142a5..976467253d2 100644
--- a/drivers/net/vmxnet3/vmxnet3_ethtool.c
+++ b/drivers/net/vmxnet3/vmxnet3_ethtool.c
@@ -311,6 +311,9 @@ vmxnet3_set_flags(struct net_device *netdev, u32 data)
/* toggle the LRO feature*/
netdev->features ^= NETIF_F_LRO;
+ /* Update private LRO flag */
+ adapter->lro = lro_requested;
/* update harware LRO capability accordingly */
if (lro_requested)
adapter->shared->devRead.misc.uptFeatures |=