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| author | Vlad Yasevich <vyasevich@gmail.com> | 2017-05-11 11:09:52 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-05-15 14:18:11 -0400 |
| commit | 70957eaecc2e43308e403c80293bec3d59632412 (patch) | |
| tree | 5b7757daa9682653e4907ecfc939beacdd8c85c5 /drivers/net/macvlan.c | |
| parent | 66c25f6e31766a9ec19c2bdc7f5f69f9c59bafd7 (diff) | |
| download | lwn-70957eaecc2e43308e403c80293bec3d59632412.tar.gz lwn-70957eaecc2e43308e403c80293bec3d59632412.zip | |
macvlan: Fix performance issues with vlan tagged packets
Macvlan always turns on offload features that have sofware
fallback (NETIF_GSO_SOFTWARE). This allows much higher guest-guest
communications over macvtap.
However, macvtap does not turn on these features for vlan tagged traffic.
As a result, depending on the HW that mactap is configured on, the
performance of guest-guest communication over a vlan is very
inconsistent. If the HW supports TSO/UFO over vlans, then the
performance will be fine. If not, the the performance will suffer
greatly since the VM may continue using TSO/UFO, and will force the host
segment the traffic and possibly overlow the macvtap queue.
This patch adds the always on offloads to vlan_features. This
makes sure that any vlan tagged traffic between 2 guest will not
be segmented needlessly.
Signed-off-by: Vladislav Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/macvlan.c')
| -rw-r--r-- | drivers/net/macvlan.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c index b34eaaae03fd..346ad2ff3998 100644 --- a/drivers/net/macvlan.c +++ b/drivers/net/macvlan.c @@ -789,10 +789,12 @@ static int macvlan_change_mtu(struct net_device *dev, int new_mtu) */ static struct lock_class_key macvlan_netdev_addr_lock_key; -#define ALWAYS_ON_FEATURES \ - (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX | \ +#define ALWAYS_ON_OFFLOADS \ + (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \ NETIF_F_GSO_ROBUST) +#define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX) + #define MACVLAN_FEATURES \ (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \ @@ -827,6 +829,7 @@ static int macvlan_init(struct net_device *dev) dev->features |= ALWAYS_ON_FEATURES; dev->hw_features |= NETIF_F_LRO; dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES; + dev->vlan_features |= ALWAYS_ON_OFFLOADS; dev->gso_max_size = lowerdev->gso_max_size; dev->gso_max_segs = lowerdev->gso_max_segs; dev->hard_header_len = lowerdev->hard_header_len; |