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authorDavide Caratti <dcaratti@redhat.com>2018-11-07 13:28:18 +0300
committerDavid S. Miller <davem@davemloft.net>2018-11-08 09:23:30 +0300
commit7dad9937e064a6411cc3427f3f5870fa72132ad8 (patch)
tree9c5ea522104dbbaaf9bec8c0005beddd0bf99167 /net/8021q/vlan.c
parentf29eb2a96c56ebff6b4d9b530d5ccd61b9f538d7 (diff)
downloadlinux-7dad9937e064a6411cc3427f3f5870fa72132ad8.tar.xz
net: vlan: add support for tunnel offload
GSO tunneled packets are always segmented in software before they are transmitted by a VLAN, even when the lower device can offload tunnel encapsulation and VLAN together (i.e., some bits in NETIF_F_GSO_ENCAP_ALL mask are set in the lower device 'vlan_features'). If we let VLANs have the same tunnel offload capabilities as their lower device, throughput can improve significantly when CPU is limited on the transmitter side. - set NETIF_F_GSO_ENCAP_ALL bits in the VLAN 'hw_features', to ensure that 'features' will have those bits zeroed only when the lower device has no hardware support for tunnel encapsulation. - for the same reason, copy GSO-related bits of 'hw_enc_features' from lower device to VLAN, and ensure to update that value when the lower device changes its features. - set NETIF_F_HW_CSUM bit in the VLAN 'hw_enc_features' if 'real_dev' is able to compute checksums at least for a kind of packets, like done with commit 8403debeead8 ("vlan: Keep NETIF_F_HW_CSUM similar to other software devices"). This avoids software segmentation due to mismatching checksum capabilities between VLAN's 'features' and 'hw_enc_features'. Reported-by: Flavio Leitner <fbl@redhat.com> Signed-off-by: Davide Caratti <dcaratti@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/8021q/vlan.c')
-rw-r--r--net/8021q/vlan.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index 5e9950453955..1b7a375c6616 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -330,6 +330,7 @@ static void vlan_transfer_features(struct net_device *dev,
vlandev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
vlandev->priv_flags |= (vlan->real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
+ vlandev->hw_enc_features = vlan_tnl_features(vlan->real_dev);
netdev_update_features(vlandev);
}