From: Andy Gospodarek <gospo@redhat.com> Date: Fri, 3 Sep 2010 21:51:44 -0400 Subject: [net] igb/igbvf: turn on TSO for VLAN interfaces Message-id: <1283550704-5205-1-git-send-email-gospo@redhat.com> Patchwork-id: 28156 O-Subject: [PATCH RHEL5.6] igb/igbvf: turn on TSO for VLAN interfaces Bugzilla: 629457 RH-Acked-by: David S. Miller <davem@redhat.com> RH-Acked-by: Stefan Assmann <sassmann@redhat.com> RH-Acked-by: Stanislaw Gruszka <sgruszka@redhat.com> This patch enables VLAN interfaces based on igb and igbvf interfaces to use TSO. This has been tested by me and results in a drop in CPU utilization from ~25% to ~12% when TSO is enabled. This patch added this support upstream for igb: commit 48f29ffc509748f5b82d7690561e98f851241a19 Author: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Date: Thu Jun 5 04:06:27 2008 -0700 igb: allow vlan devices to use TSO and TCP CSUM offload and the original igbvf submission already included support for TSO on VLANs. This patch will help resolve 629457. diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c index 29ee097..c379edd 100644 --- a/drivers/net/igb/igb_main.c +++ b/drivers/net/igb/igb_main.c @@ -1820,6 +1820,8 @@ static int __devinit igb_probe(struct pci_dev *pdev, netdev->features |= NETIF_F_TSO; netdev->features |= NETIF_F_TSO6; netdev->features |= NETIF_F_GRO; + netdev->features |= NETIF_F_VLAN_TSO; + netdev->features |= NETIF_F_VLAN_CSUM; if (pci_using_dac) netdev->features |= NETIF_F_HIGHDMA; diff --git a/drivers/net/igbvf/netdev.c b/drivers/net/igbvf/netdev.c index 6571fb8..df4b36e 100644 --- a/drivers/net/igbvf/netdev.c +++ b/drivers/net/igbvf/netdev.c @@ -2751,6 +2751,8 @@ static int __devinit igbvf_probe(struct pci_dev *pdev, netdev->features |= NETIF_F_TSO; netdev->features |= NETIF_F_TSO6; + netdev->features |= NETIF_F_VLAN_TSO; + netdev->features |= NETIF_F_VLAN_CSUM; if (pci_using_dac) netdev->features |= NETIF_F_HIGHDMA;