From 7dad9937e064a6411cc3427f3f5870fa72132ad8 Mon Sep 17 00:00:00 2001 From: Davide Caratti Date: Wed, 7 Nov 2018 11:28:18 +0100 Subject: 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 Signed-off-by: Davide Caratti Signed-off-by: David S. Miller --- net/8021q/vlan.c | 1 + 1 file changed, 1 insertion(+) (limited to 'net/8021q/vlan.c') 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); } -- cgit v1.2.3